CN110145629B

CN110145629B - Electrically operated valve and manufacturing method thereof

Info

Publication number: CN110145629B
Application number: CN201810261345.0A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2018-02-13
Filing date: 2018-03-28
Publication date: 2022-04-08
Anticipated expiration: 2038-03-28
Also published as: CN110145629A; CN115264077A

Abstract

The invention discloses an electric valve, which comprises a valve body part, wherein the valve body part comprises a valve core sleeve, the valve core sleeve comprises a first guide inner wall, a transmission part, a movable connecting part is connected with the transmission part in a suspension way, the movable connecting part comprises a connecting body, the connecting body comprises a first guide outer wall, the first guide outer wall is in clearance sliding fit with the first guide inner wall, the connecting body comprises a lower opening part and a containing hole communicated with the lower opening part, the hole wall of the containing hole comprises a second guide inner wall, a valve needle part comprises a valve needle, the valve needle comprises a second guide outer wall, the second guide outer wall is in clearance sliding fit with the second guide inner wall, one end of an elastic element is abutted against the movable connecting part, the other end of the elastic element is abutted against the valve needle, and the reliability of the electric valve is relatively improved, the invention also discloses a manufacturing method of the electric valve.

Description

Electrically operated valve and manufacturing method thereof

Technical Field

The invention relates to the technical field of fluid control, in particular to an electric valve and a manufacturing method thereof.

Background

The electric valve is used as an important part for forming a refrigerating system and is widely applied to a refrigerating unit, a refrigeration house, a supermarket refrigerator and the like.

The electric valve mainly comprises a valve body component, a driving component, a transmission component, a sleeve component with a valve port and a valve needle component, wherein the transmission component acts on the valve needle component through the rotation driving of the driving component, so that the valve needle component is far away from or contacts the valve port, and the flow rate adjusting function of the electric valve is realized. In the electric valve of the background art, the elastic load of the spring is always applied between the transmission shaft of the transmission part and the valve needle of the valve needle part, which results in that the valve needle rotates along with the rotation of the transmission shaft as long as the valve needle does not have a resistance force (force for stopping rotation) acting on the valve needle to overcome the frictional resistance between the valve needle and the transmission shaft in the rotation direction caused by the spring load, on one hand, the valve opening resistance is large, which affects the action reliability of the electric valve, on the other hand, the abrasion of the contact surface of the valve needle and the valve port part is possibly intensified, which results in the deterioration of the sealing performance of the valve, and the action reliability of the electric valve is an important index for measuring the product performance.

Disclosure of Invention

The application aims to provide the electric valve, the reliability of the electric valve is relatively improved, and the motion stability of a valve needle component is improved.

The application provides an electrically operated valve, includes:

the valve body component comprises a valve core sleeve, and the valve core sleeve comprises a first guide inner wall;

a drive member including an electromagnetic coil and a rotor;

the transmission component comprises a transmission shaft, and the transmission shaft is fixedly connected with the driving component;

the movable connecting part is connected with the transmission part in a hanging mode and can be driven by the transmission part to move axially relative to the valve core sleeve;

the movable connecting part comprises a connecting body, the connecting body comprises a first guide outer wall, the first guide outer wall is in clearance sliding fit with the first guide inner wall, the connecting body comprises a lower opening part and a containing hole communicated with the lower opening part, and the hole wall of the containing hole comprises a second guide inner wall;

the valve needle component is in suspension connection with the movable connecting component and can be driven by the movable connecting component to move axially relative to the valve core sleeve; the valve needle component comprises a valve needle which comprises a second guide outer wall, and the second guide outer wall is in clearance sliding fit with the second guide inner wall;

and one end of the elastic element is abutted with the movable connecting part, and the other end of the elastic element is abutted with the valve needle.

The utility model provides an electrically operated valve, realize the direction of case cover to movable connection part through setting up of first direction inner wall and first direction outer wall, realize movable connection part to the direction of needle part through setting up of second direction inner wall and second direction outer wall, like this, make the case cover to the indirect direction of needle part, make the needle part aim at the valve port more accurately, it is steady to improve to close valve seal nature and needle part action, elastic element's one end butt movable connection part, other end butt needle part. Therefore, when the electric valve is opened, the elastic force of the elastic element generates an upward pushing force on the movable connecting part, the reliability of opening the valve is improved, and the motion stability of the valve needle part is improved.

The application also provides a manufacturing method of the electric valve with the functions, which comprises the following steps:

a1 preparing an upper valve body, a lower valve body and a valve core sleeve of the valve body component, preparing the rotor, preparing the connecting body, the upper member and the lower member of the movable connecting component, preparing the valve needle and the lower clamping piece of the valve needle component, preparing the transmission component and preparing a nut component;

a2 wherein the elastic element, the lower member, and the lower engaging piece are provided on the outer edge of the needle, and one end of the elastic element abuts against the lower member and the other end abuts against the needle; disposing the upper member to the drive shaft outer edge portion; sleeving the connecting body on the outer edge part of the valve needle, enabling the connecting body and the valve needle to be in clearance sliding fit through the second guide inner wall and the second guide outer wall, and fixedly connecting the upper member and the lower member with the upper opening part and the lower opening part of the connecting body respectively;

a3 fixedly connecting the lower valve body with the valve core sleeve;

a4 fitting the valve core sleeve and the connecting body in a sliding way through the clearance between the first guide inner wall and the first guide outer wall;

a5 is that the nut component is connected with the transmission shaft by screw thread, the nut component is fixedly connected with the lower valve body, and the rotor is fixedly connected with the transmission shaft;

a6 is used for welding and fixing the upper valve body and the lower valve body of the valve body component.

Drawings

Figure 1 is a schematic cross-sectional view of a first embodiment of an electrically operated valve according to the present invention, wherein the valve is in a fully open state;

FIG. 2 is the drawing I in FIG. 1₁A partial enlarged view of the site;

FIG. 3 is a diagram I of the electrically operated valve shown in FIG. 1 in a closed state₁A partial enlarged view of the site;

FIG. 4 is a diagram I of the electrically operated valve shown in FIG. 1 in a second closed state₁A partial enlarged view of the site;

FIG. 5 is a diagram I of the electrically operated valve shown in FIG. 1 in a closed valve state₁A partial enlarged view of the site;

figure 6 is a schematic structural view of a spool sleeve of the first embodiment of an electrically operated valve;

figure 7 is a schematic structural view of the movable connection part of the first embodiment of the electric valve;

figure 8 is a schematic view of the first embodiment of the electric valve showing the assembled needle part, lower member, resilient element and gasket;

figure 9 is a schematic cross-sectional view of a second embodiment of an electrically operated valve according to the present invention, wherein the valve is in a fully open state;

FIG. 10 is the drawing I in FIG. 9₂A partial enlarged view of the site;

FIG. 11 is a diagram I of the electrically operated valve shown in FIG. 9 in a closed state₂A partial enlarged view of the site;

FIG. 12 is a diagram I of the electrically operated valve shown in FIG. 9 in a second closed state₂A partial enlarged view of the site;

FIG. 13 is a diagram I of the electrically operated valve shown in FIG. 9 in a closed valve state₂A partial enlarged view of the site;

FIG. 14 is a schematic view of the structure of the articulating components of FIG. 9;

FIG. 15 is a schematic structural view of the needle assembly of FIG. 9;

figure 16 shows a first diagram of the behaviour of the motorised valve of the invention;

fig. 17 shows a second schematic view of the operational characteristics of the electrically operated valve of the present invention.

Detailed Description

It should be noted that the terms of orientation, "upper" and "lower", etc., as used herein, are defined with reference to the positions illustrated in the drawings of the present specification, and reference herein to "axial" refers to the axial direction of an electrically operated valve, specifically, such as along the axial direction of a spool sleeve of an electrically operated valve. The term "radial" as referred to herein refers to a direction perpendicular to the axial direction of the aforementioned electrically operated valve. It is to be understood that the directional terms are used merely for clarity and convenience in describing the technical solutions and should not be taken as limiting the scope of protection.

It should be noted that "suspended connection" herein means that one of the two components supports the other component but the two components are not fixedly connected, and in some states of the electric valve, one and the other can be considered to integrally move synchronously, and in some states of the electric valve, the two components can be axially and/or radially displaced relatively.

It should be noted that "closed" in this context means a state in which the electric valve is in a state in which the valve is closed in fig. 3 or fig. 8, hereinafter, that is, a state in which the valve needle member moves in a valve closing direction from the valve-opened state to a state in which the valve needle member just closes the valve port.

It should be noted that the comparison of the axial displacement of the transmission member with the predetermined displacement is discussed with reference to the valve closing state i in fig. 3 or fig. 11, i.e. starting from the closing state of the electric valve.

It should be noted that, for convenience of description, the first group of guide mechanisms includes a first inner guide wall and a first outer guide wall, and the second group of guide mechanisms includes a second inner guide wall and a second outer guide wall.

In order to make those skilled in the art better understand the technical solution of the present application, the technical solution of the present application is further described below with reference to the accompanying drawings and specific embodiments, and particularly, the core invention of the technical solution of the present application is mainly described in detail.

The first embodiment is as follows:

referring to fig. 1 to 8 and fig. 16 and 17, fig. 1 is a schematic cross-sectional view of a first embodiment of an electric valve provided in the present invention, wherein the valve is in a fully open state. FIG. 2 is the drawing I in FIG. 1₁A partial enlarged view of the site. FIG. 3 is a diagram I of the electrically operated valve shown in FIG. 1 in a closed state₁A partial enlarged view of the site. FIG. 4 is a diagram I of the electrically operated valve shown in FIG. 1 in a second closed state₁A partial enlarged view of the site. FIG. 5 is a diagram I of the electrically operated valve shown in FIG. 1 in a closed valve state₁A partial enlarged view of the site. Fig. 6 is a schematic structural view of a spool sleeve of the first embodiment of the electric valve. Fig. 7 is a schematic structural view of the movable connection part of the first embodiment of the electric valve. Fig. 8 is a schematic structural view of the first embodiment of the electric valve after the needle part is assembled with the lower member, the elastic element and the gasket. FIG. 16 is a schematic view showing the operation characteristics of the electric valve of the present invention, including the relationship between the pulse number of the electromagnetic coil and the displacement of the needle, the relationship between the pulse number of the electromagnetic coil and the elastic force of the elastic element, and the relationship between the pulse number of the electromagnetic coil and the valve flow rate, wherein t represents t in this embodiment₁. Fig. 17 is a second schematic view showing the operation characteristics of the electric valve according to the present invention, which shows the relationship between the number of pulses of the electromagnetic coil and the frictional force of the first group guide means and the second group guide means.

In the following of the present embodiment, the valve opening state shown in fig. 2 is defined as "valve opening state", in which the transmission member 4A and the movable connecting member 6A have a relatively movable distance in the axial direction, which is marked by t₁I.e. the predetermined displacement amount in the present embodiment; the valve needle part 5A is defined to close the valve port 21A, and the transmission part 4A and the movable connecting part 6A are still maintained to be relatively movable in the axial direction by a distance t₁The time state is "valve closing state one", as shown in fig. 3; an axial displacement amount defined from "the valve-closed state" shown in fig. 3 to a movement of the transmission member 4A toward the valve-closed direction is equal to or less than a predetermined displacement amount t₁During the period of "closed valve stateSecond ", FIG. 4 shows that the axial displacement of the transmission member from the initial position of the valve closing state is equal to t₁A schematic structural diagram of the time; the axial displacement quantity of the transmission component 4A which tends to move in the valve closing direction from the first valve closing state is defined to be larger than the preset displacement quantity t₁The valve is closed, as shown in FIG. 5.

As shown in fig. 1 and 2, the electric valve includes a valve body member 1A having a valve chamber 11A, a drive member 3A, a transmission member 4A, a needle member 5A, a movable connecting member 6A, an elastic element 7A, and a nut member 8A. The valve body component 1A comprises an upper valve body 12A, a lower valve body 13A and a valve core sleeve 2A, the upper valve body 12A and the lower valve body 13A are welded and fixed to form a valve cavity 11A, a first connecting pipe is connected to the lower valve body 13A, and the valve core sleeve 2A is fixedly connected with the lower valve body 13A. In this embodiment, the valve core sleeve 2A and the lower valve body 13A are both of a split structure, and are fixed by welding, it can be understood that the valve core sleeve 2A and the lower valve body 13A may also be of an integrated structure, and are both processed into one part. The valve core sleeve 2A is provided with a valve port 21A, the valve port 21A is substantially disposed in the valve cavity 11A, and the lower end of the valve core sleeve 2A extends out of the valve cavity 11A and is connected with a second connecting pipe, that is, in this embodiment, the valve core sleeve 2A is partially disposed in the valve cavity 11A. The movable connecting part 6A is in clearance sliding fit with the valve core sleeve 2A and is at least partially arranged in the valve core sleeve 2A, and the valve core sleeve 2A is approximately in an axially through structure. The movable connecting part 6A is connected with the transmission part 4A in a hanging mode, and the movable connecting part 6A can be driven by the transmission part 4A to move axially relative to the valve core sleeve 2A. One end of the valve needle component 5A extends into the movable connecting part 6A, the movable connecting part 6A supports the valve needle component 5A, the valve needle component 5A is connected with the movable connecting part 6A in a hanging mode, the valve needle component 5A can be driven by the movable connecting part 6A to move axially relative to the valve core sleeve 2A, the elastic element 7A is sleeved on the outer peripheral portion of the valve needle component 5A, one end of the elastic element 7A is abutted to the movable connecting part 6A, and the other end of the elastic element 7A is abutted to the valve needle component 5A.

The nut member 8A includes a nut 81A having a female screw hole, a spring rail 82A fixed to an outer edge portion of the nut 81A, and a slide ring 83A, and the slide ring 83A is slidable in the axial direction on the spring rail 82A. The nut 81A is fixedly connected with the upper end of the lower valve body 13A through a connecting sheet 84A, and the nut part 8A is sleeved on the periphery of the transmission part 4A and is in threaded transmission connection with the transmission part 4A. The driving member 3A specifically includes an electromagnetic coil 34A and a rotor 31A, a coupling seat 32A fixedly coupled to the rotor 31A, and a stopper rod 33A fixedly coupled to the coupling seat 32A. The electromagnetic coil 3A is fixedly connected to the valve body member 1A via a connecting bracket (not shown). The electromagnetic coil 3A supplies a pulse signal. The rotor 31A of the drive member 3A is provided on the outer periphery of the nut member 8A, and the rotor 31A is fixedly connected to the power transmission member 4A and drives the power transmission member 4A to move in the axial direction of the valve body member 5A in cooperation with the electromagnetic coil 34A. When the driving member 3A drives the transmission member 4A to reciprocate along the axial direction of the valve body member 1A, the needle member 5A and the movable connecting member 6A can be operated to adjust the opening degree of the valve port 21A of the electric valve.

In order to align the valve needle component 5A with the valve port 21A more accurately, the valve closing reliability of the valve is relatively improved, in the electric valve of the embodiment, the valve core sleeve 2A includes a first guiding inner wall, the movable connecting component 6A includes a first guiding outer wall capable of being in clearance sliding fit with the first guiding inner wall, the movable connecting component 6A further includes a second guiding inner wall, and the valve needle component 5A includes a second guiding outer wall in clearance sliding fit with the second guiding inner wall. By definition, the first guiding inner wall and the first guiding outer wall form a first group of guiding mechanisms, and the second guiding inner wall and the second guiding outer wall form a second group of guiding mechanisms.

Specifically, as shown in fig. 2 and fig. 6 to 8, the spool case 2A has a cylindrical inner wall with a first through hole, the wall of the first through hole includes a first guiding inner wall 201A, and the movable connecting member 6A is at least partially disposed in the first through hole. In the present embodiment, the upper end of the movable connecting member 6A protrudes from the upper end of the valve core housing 2A, that is, the movable connecting member 6A is partially disposed inside the valve core housing 2A. The outer wall of the movable connecting part 6A includes a first guiding outer wall 601A which is in clearance sliding fit with the first guiding inner wall 201A, so that the valve core sleeve 2A and the movable connecting part 6A are in guiding fit through the first guiding inner wall and the first guiding outer wall, that is, the first guiding inner wall 201A of the valve core sleeve 2A guides the movable connecting part 6A.

The movable connecting part 6A includes a second guide inner wall 602A, and one end of the needle member 5A protrudes into the movable connecting part 6A, and the needle member 5A has a second guide outer wall 502A which is clearance-slidably fitted with the second guide inner wall 602A. Thus, the movable connecting part 6A is guided to engage with the needle member 5A via the second guide inner wall 602A and the second guide outer wall 502A. That is, the second guide inner wall 602A of the movable connecting member 6A guides the needle member 5A.

The electric valve of the embodiment realizes the guiding of the valve core sleeve 2A to the movable connecting part 6A through the matching of the first guiding inner wall 201A and the first guiding outer wall 601A, and realizes the guiding of the movable connecting part 6A to the valve needle part 5A through the matching of the second guiding inner wall 602A and the second guiding outer wall 502A, so that the valve core sleeve 2A indirectly guides the valve needle part 5A through the arrangement of two groups of guiding mechanisms, so that the valve needle part is more accurately aligned with the valve port, and the valve closing reliability is relatively improved.

Further, in the final stage of closing the valve (i.e., in the process from the second to the third valve-closing states described above), friction is generated between the first guide inner wall 201A and the first guide outer wall 601A and between the second guide inner wall 602A and the second guide outer wall 502A, which adversely affects opening of the valve, so that the electric valve of the present embodiment further includes the elastic element 7A, and the elastic element 7A is fitted around the outside of the needle member 5A, and one end thereof abuts against the movable connecting member 6A and the other end thereof abuts against the needle member 5A, in order to improve reliability of opening the valve. Thus, when the electric valve is opened instantaneously (i.e., during the third state to the second state), the elastic force of the elastic element 7A pushes the movable connecting part 6A upward, which helps to overcome the friction force, so that the movable connecting part 6A is more easily moved upward, the phenomenon of locking due to the friction is avoided, the valve is more easily opened, the movement of the needle part is stable, the abrasion between the contact part of the needle part 5A and the valve port 21A is reduced, the internal leakage rate of the electric valve is reduced, and the sealing performance of the valve is improved.

Further, the transmission member 4A includes a first radial projecting portion, and the movable connecting member 6A includes a first hanging portion, the first radial projecting portion suspendedly supporting the first hanging portion, the first radial projecting portion being capable of abutting against or separating from the first hanging portion, so that the transmission member 4A suspendedly supports the movable connecting member 6A, that is, the transmission member 4A is suspendedly connected with the movable connecting member 6A. The movable connecting part 6A further includes a second radial projection, and the needle member 5A includes a second hanging portion, the second radial projection suspendedly supporting the second hanging portion, the second radial projection being capable of abutting against or separating from the second hanging portion to suspendedly support the needle member 5A by the movable connecting part 6A, that is, to suspendedly connect the movable connecting part 6A with the needle member 5A. The movable connecting part 6A includes a stopper portion disposed below the first radial projecting portion, and the first radial projecting portion can abut against the stopper portion when the transmission part 4A tends to move in the valve closing direction.

Specifically, when the transmission member 4A moves to the first radial protruding portion to abut against the first hanging portion and the second radial protruding portion to abut against the second hanging portion, the transmission member 4A can drive the movable connecting member 6A to move upward in the axial direction, and the movable connecting member 6A can drive the valve needle member 5A to move upward in the axial direction.

When the transmission member 4A moves from the valve opening state to the valve closing direction, the movable connecting member 6A and the needle member 4A move downward along with the transmission member 4A due to their own gravity as the transmission member 4A moves downward, that is, the movable connecting member and the needle member 4A move together until the valve opening 21A is closed by the needle member 5A. When the valve needle component 5A closes the valve port 21A, the transmission component 4A moves towards the valve closing direction by a preset displacement t₁Meanwhile, the elastic element 7A does not generate a spring force that urges the needle member 5A toward the valve port 21A; when the valve needle component 5A closes the valve port 21A, the transmission component 4A moves towards the valve closing direction by a preset displacement t₁In the above case, that is, after the transmission member 4A moves in the valve closing direction until the first radial protrusion abuts against the stopper, the transmission member 4A presses the movable connecting member 6A to move in the valve closing direction, and the elastic element 7A presses the needle member 5A toward the valve port 21A.

Thus, the displacement amount of the needle member 5A from the time of closing the valve port 21A to the time of moving the transmission member 4A in the valve-closing direction does not exceed the preset displacement amount t₁During the time period and at the instant of opening the valve,the friction force generated between the valve needle component 5A and the valve port 21A is the force caused by the gravity of the valve needle component 5A, the abrasion loss of the contact surface of the valve needle component 5A and the valve port 21A is small, the internal leakage of the electric valve is further reduced, the leakage of the valve port in a fully closed state can be avoided even if the electric valve operates repeatedly, and the valve sealing performance is improved.

Before the valve is closed, the valve needle member 5 and the transmission member 4A are not urged by the spring force of the elastic element 7A, the valve needle member 5A and the movable link member 6A do not rotate together with the transmission member 4A, and there is almost no frictional force between the valve core case 2A and the movable link member 6A and between the movable link member 6A and the valve needle member 5A, whereby the valve opening resistance can be further reduced.

The electric valve of the embodiment works according to the following principle:

when the transmission member 4A moves from the valve-open state shown in fig. 2 to the valve-closing direction to close the valve port 21A, i.e., during the first valve-closed state shown in fig. 3, the movable connecting member 6A and the valve needle member 5A also move together under the action of their own weight, and the first guide inner wall 201A and the first guide outer wall 601A are in axial relative movement and guide engagement. At this time, although the first guide inner wall 201A and the first guide outer wall 601A are worn away, the friction force is generated only by the self-weight of the movable connecting member 6A, and the degree of wear is small. Also, the elastic element 7A does not generate a spring force that presses the needle member 5A against the valve port 21A.

Subsequently, during the second valve closing state, i.e. during the movement from the state shown in fig. 3 to the state shown in fig. 4, the transmission member 4A moves downwards, i.e. the transmission member 4A moves at the predetermined displacement t relative to the movable connecting member 6A₁Moving in the axial direction towards the valve closing direction. In the process that the transmission component 4A moves downwards, the positions of the movable connecting component 6A and the valve needle component 5A are kept still, the first guide inner wall 201A and the first guide outer wall 601A are in guide fit with each other, the second guide inner wall 602A and the second guide outer wall 502A are not in relative displacement, and no friction force is generated. Further, the elastic element 7A does not generate a spring force for pressing the needle member 5A in the direction of the valve port 21A, and the contact portion between the needle member 5A and the valve port 21A is not worn.

Then, in the third process of the valve closing state, when the transmission member 4A continues to move in the valve closing direction to the state shown in fig. 5 in the state shown in fig. 4, the transmission member 4A pushes the movable connecting member 6A and the movable connecting member 6A pushes the elastic element 7A to move in the valve closing direction together, in this process, the movable connecting member 6A moves downward relative to the valve core housing 2A, and the first guide inner wall 201A and the first guide outer wall 601A are in guide fit with each other, and the first guide inner wall 201A and the first guide outer wall 601A are worn, so that a friction force is generated. The movable connecting part 6A moves downward relative to the needle member 5A, and is guided and engaged by the second guide inner wall 602A and the second guide outer wall 502A, and the second guide inner wall 602A and the second guide outer wall 502A are worn away to generate a frictional force. In this process, the elastic element 7A is deformed by pressure to generate a spring force that presses the needle member 5A against the valve port 21A, thereby further improving the valve closing reliability and the sealing performance at the time of valve closing.

In the valve opening process, when the electric valve moves from the state shown in fig. 5 to the state shown in fig. 4, that is, from the third state of valve closing to the second state of valve closing shown in fig. 4, the movable connecting part 6A is pressed upward by the spring force of the elastic element 7A, so that the frictional force generated in the third state of valve closing can be easily overcome, and the valve opening jam phenomenon caused by the frictional force can be avoided. In the second closed state to the fully opened state of the valve shown in fig. 2, since almost no friction is generated between the first guide inner wall 201A and the first guide outer wall 601A and between the second guide inner wall 602A and the second guide outer wall 502A, the valve can be freely opened without the valve-opening jam.

In the whole process, the electric valve realizes the guiding of the valve core sleeve 2A to the movable connecting part 6A through the matching of the first guiding inner wall 201A and the first guiding outer wall 601A, and realizes the guiding of the movable connecting part 6A to the valve needle part 5A through the matching of the second guiding inner wall 602A and the second guiding outer wall 502A, so that the valve closing reliability and the valve opening reliability are improved, and the sealing performance during valve closing is also improved.

As can be seen from the foregoing, the motor-operated valve of the present embodiment:

on one hand, the valve needle component 5A can be more accurately aligned to the valve port in the moving process through the matching of the first guide inner wall 201A and the first guide outer wall 601A and the guide matching of the second guide inner wall 602A and the second guide outer wall 502A, the valve closing reliability is improved, and the motion stability of the valve needle component is improved.

On the other hand, in the electrically-operated valve, in the third stage of the valve-closing state of the valve, friction force is generated between the first guide inner wall 201A and the first guide outer wall 601A and between the second guide inner wall 602A and the second guide outer wall 502A, and this friction force affects the valve-opening operation performance, and therefore, in the present embodiment, the elastic element 7A is provided outside the needle member 5A, and one end thereof abuts against the movable link member 6A, and the other end thereof abuts against the needle member 5A, so that the movable link member 6A is pressed upward by the spring force of the elastic element 7A during the valve-opening process, and this friction force is favorably overcome to avoid the valve-opening jam due to this friction force, thereby further improving the valve-opening reliability.

The transmission member 4A is connected to the movable connection member 6A in a suspended manner, the movable connection member 6A is connected to the needle member 5A in a suspended manner, and the transmission member 4A moves by a predetermined displacement t toward the valve closing direction after the needle member 5A closes the valve port 21A₁Meanwhile, the elastic element 7A does not generate a spring force for pressing the needle member 5A against the valve port 21A, and the valve member 5A starts to move by the predetermined displacement t until the transmission member 4A approaches the valve-closing direction after closing the valve port 21A₁In the above, the elastic element 7A generates a spring force that presses the needle member 5A against the valve port 21A. Thus, the contact portion between the valve needle member 5A and the valve port 21A is worn only in the three-stage process of the valve closing state, the contact portion between the valve needle member 5A and the valve port 21A is not worn in the two-stage process of the valve opening state to the first valve closing state and the first valve closing state to the second valve closing state, so that the internal leakage between the valve needle member 5A and the valve port 21A is reduced, the same applies when the valve needle 51A and the valve port 21A are separated in the valve opening process, and the frictional force between the valve needle 51A and the valve port 21A is caused only by the self weight of the valve needle member 5A and the movable connecting member 6A at the moment of separation of the valve needle 51A and the valve port 21A, and even if the valve needle is repeatedly operated, the valve needle is repeatedly operatedThe abrasion loss at the contact portion between the valve port 51A and the valve port 21A is extremely small, and the sealing performance of the valve is improved.

The specific structural design of the transmission member 4A, the needle member 5A, and the movable connecting member 6A in the present embodiment will be described in detail below.

As shown in fig. 2, 3, 6, and 7, the movable connecting member 6A includes a substantially cylindrical connecting body 62A, the upper end of the connecting body 62A has an upper opening 603A, the lower end of the connecting body 62A has a lower opening 604A, and the upper opening and the lower opening are not connected, but may be disconnected as long as the object of the present invention can be achieved. The movable connecting part 6A further includes an upper member 63A fixed to the upper opening portion 603A and a lower member 64A fixed to the lower opening portion 604A. One end of the elastic element 7A abuts the lower member 64A. The upper member 63A comprises a first suspension portion and the lower member 64A comprises a second radial projection, the elastic element 7A being in particular in abutment with the lower end face of the second radial projection.

The outer wall of the connection body 62A may have a circular cross section, and include a first guide outer wall 601A, the connection body 62A further includes a receiving hole 61A communicating with the lower opening portion 604A, and a hole wall of the receiving hole 61A includes a second guide inner wall 602A. The connecting body 62A includes a first annular protrusion 622A, an upper end surface portion of which is disposed opposite to the first radial protrusion, as a stopper in the present embodiment, and the upper end surface portion of the stopper can abut against a lower end surface portion of the first radial protrusion of the transmission member 4A.

The upper member 63A is a first annular member having an axial through hole, which is sleeved on the outer edge of the transmission component 4A and fixed on the upper opening 603A of the connecting body 62A by press-fitting or welding or press-fitting and welding combination. The first ring includes a first ring portion 631A, and the first ring portion 631A serves as a first hanging portion of the present embodiment.

When the upper member 63A and the upper opening portion of the connecting body 62A are welded and fixed, in order to avoid adverse effects of the welding position and the nearby portion of the upper member 63A and the connecting body 62A after welding on the guiding function between the first guiding inner wall 201A and the first guiding outer wall 601A, the inner wall of the valve core sleeve 2A is designed to include a first small diameter portion 20A, the first small diameter portion 20A includes a first guiding inner wall 201A, and a first diameter-expanded portion 23A with a diameter larger than that of the first small diameter portion 20A is arranged above the first small diameter portion 20A; alternatively, the connecting body 62A is designed such that the outer wall includes a first large-diameter portion 624A and a first reduced-diameter portion 625A provided above the first large-diameter portion 624A, the first large-diameter portion 624A includes a first guide outer wall 601A, and the first reduced-diameter portion 625A is welded to the upper member 63A; alternatively, the inner wall of the spool case 2A is designed to include the first small diameter portion 20A, the first small diameter portion 20A includes the first guide inner wall 201A, the first diameter-enlarged portion 23A having a diameter larger than that of the first small diameter portion 20A is provided above the first small diameter portion 20A, and the connecting body 62A is designed such that the outer wall includes the first large diameter portion 624A and the first diameter-reduced portion 625A provided above the first large diameter portion 624A, the first large diameter portion 624A includes the first guide outer wall 601A, and the first diameter-reduced portion 625A is welded and fixed to the upper member 63A.

The lower member 64A is fixed to the lower opening portion 604A of the connecting body 62A by press-fitting or welding or a combination of press-fitting and welding. The lower member 64A is embodied as a base member having an axial through hole, which is fitted over the outer edge portion of the needle member 5A, and more specifically, the base member is designed as an "H" shaped structure with an axial through hole, wherein the inner wall of the middle portion extends in the radial direction to include a second annular portion 641A having an upper end surface portion 6411A and a lower end surface portion 6412A, and the second annular portion 641A is a second radial protrusion in the present embodiment, and the upper end surface portion 6411A is used for abutting against a lower engaging member below. A receiving groove is formed between the lower end surface portion 6412A and the inner sidewall of the connecting body 62A below the second annular portion 641A, and one end of the elastic element 7A is located in the receiving groove and abuts against the lower end surface portion 6412A. In order to avoid the influence of the welding position of the lower member 64A after being welded with the connecting body 62A on the guiding fit between the first guiding inner wall 201A and the first guiding outer wall 601A, the inner wall of the valve core sleeve 2A is designed to further comprise a second diameter-expanding portion 24A which is arranged below the first small-diameter portion 20A and has a diameter larger than that of the first small-diameter portion 20A; or the connecting body 62A is designed such that the outer wall includes a second reduced diameter portion 626A at the lower portion of the first large diameter portion 624A, and the second reduced diameter portion 626A is welded to the lower member 64A; alternatively, the inner wall of the valve core housing 2A is designed to include a second enlarged diameter portion 24A having a larger diameter than the first small diameter portion 20A, which is provided below the first small diameter portion 20A, and the connecting body 62A is also designed to have an outer wall including a second reduced diameter portion 626A located below the first large diameter portion 624A, and the second reduced diameter portion 626A is welded and fixed to the lower member 64A.

In the present embodiment, as a specific design, the valve core housing 2A is provided with a first diameter-expanding portion 23A and a second diameter-expanding portion 24A, and the two end portions of the connecting body 62B are provided with a first diameter-reducing portion 625A and a second diameter-reducing portion 626A, respectively, for avoiding the influence of the welding portion on the guiding function of the first group of guiding mechanisms and the second group of guiding mechanisms when the upper member 63B and the lower member 64B are welded.

As shown in fig. 3 and 4, the transmission component 4A includes a transmission shaft 41A and an upper engaging member 42A sleeved and fixed at the lower end of the transmission shaft 41A, the upper engaging member 42A is a set having a middle through hole matched with the transmission shaft 41A, the set includes a large-diameter ring portion 421A located between the upper member 63A and the first annular protrusion 622A, and further includes a small-diameter ring portion 422A extending downward from the lower end of the large-diameter ring portion 421A and having a diameter smaller than that of the large-diameter ring portion 421A, and the large-diameter ring portion 421A serves as a first radial protrusion in this embodiment. In this embodiment, the upper engaging piece 42A is fixed to the lower end portion of the transmission shaft 41A by welding, and the small-diameter ring portion 422A is provided to facilitate welding therebetween. It is understood that the small-diameter ring portion 422A may not be provided on the upper engaging piece 42A, or the transmission component 4A may also adopt the structure of the transmission component in the second embodiment of the present application, that is, it is also possible to directly form a radially protruding boss as the first radial protrusion on the lower end portion of the transmission shaft instead of separately providing the upper engaging piece.

The upper member 62A and the first annular protrusion 622A include an accommodation space 611A therebetween, and the large-diameter ring portion 421A of the transmission member 4A is movable in the axial direction in the aforementioned accommodation space 611A. Then, in the first state of the valve-opened state and the valve-closed state of the motor-operated valve, the first hanging portion 631A of the upper member 63A abuts on the upper end surface portion of the large-diameter ring portion 421A (first radial protruding portion) of the transmission unit 4A, and the transmission unit 4A suspendedly supports the movable connecting member 6A, and at this time, the lower end surface portion of the large-diameter ring portion 421A of the transmission unit 4A and the first annular ring portion 421AThe axial distance between the upper end surfaces of the protrusions 622A (stoppers) is the preset displacement t in this embodiment₁The predetermined displacement t₁Can be set according to actual needs.

As shown in fig. 4, 7 and 8, the valve needle component 5A includes a valve needle 51A, and the valve needle 51A specifically includes a flow rate adjusting portion 512A that is in contact with or separated from the valve port 21A, a guide portion 513A that extends into the accommodation hole 61A, and a main body portion 511A that is located between the guide portion 513A and the flow rate adjusting portion 512A. The outer wall of the guide part 513A includes a second guide outer wall 502A. The second guide outer wall 502A is in clearance sliding engagement with the second guide inner wall 602A. The main body portion 511A and the flow rate adjustment portion 512A together form a first stepped portion 514A. The first step portion 514A is provided with a washer 53A. The elastic element 7A is fitted around the outer periphery of the main body 511A, and the other end of the elastic element 7A directly abuts against the washer 53A and indirectly abuts against the main body 511A. Here, it is understood that the aforementioned gasket 53A may be disposed in the receiving groove of the lower member 64A, or the gasket 53A may be disposed in the receiving groove and on the first step portion 514A, and the gasket 53A is used to reduce the friction between the elastic element 7A and the lower member 64A or the valve needle 51A, so as to reduce the friction between the valve needle part 5A and the transmission part 4A, and prevent the valve needle 51A from rotating with the transmission part 4A, so as to reduce the wear of the contact portion of the valve needle 51A and the valve port 21A. The "flow rate adjusting portion" described herein is a portion that can adjust the flow rate of the electric valve in cooperation with the valve port 21A. The main body portion refers to a portion located between the flow rate regulating portion and the guide portion.

The needle member 5A further includes a lower engaging piece 52A provided in the lower opening portion 604A and fitted over an outer edge portion of the body portion 511A of the needle 51A. The lower end surface portion of the lower engaging piece 52A for engaging with the lower member 64A serves as a second hanging portion 521A. Specifically, the body portion 511A of the needle 51A is provided with an annular recess 5111A at an upper end portion connected to the guide portion 513A, and the lower engaging piece 52A is a C-shaped insert piece which is engaged with an outer edge of the annular recess 5111A, is positioned between the guide portion 513A and the lower member 64A, and has a lower end surface capable of abutting against an upper end surface of the lower member 64A. The lower engaging piece 52A functions similarly to a radial projecting ring with a notch formed on the peripheral portion of the needle 51A, and it abuts against the second annular projection 641A to suspendably support the needle member 5A by the movable connecting member 6A.

As described above, the lower engaging piece 52A and the needle 51A are two separate members, but of course, they may be formed as an integral structure without affecting the assembly.

It should be noted that, when the lower engaging member 52A and the valve needle 51A are two separate parts, the lower engaging member 52A may be fixed to the valve needle 51A or movably connected to the valve needle 51A. When movably connected, the lower engaging member 52A merely covers the outer edge of the guiding portion 513A, and is axially movable relative to the guiding portion 512A, as shown in this embodiment.

In actual installation, the upper engaging piece 42A and the lower engaging piece 52A may not be provided with the above-described structure, and both may be provided so long as they can be matched with the corresponding structures to meet the above-described connection requirements.

In addition, when specifically configured, the lower engaging member 52A and the lower member 64A have a predetermined radial displacement therebetween, that is, the lower engaging member 52A can have a certain displacement space in the radial direction relative to the lower member 64A, so that the valve needle 51A can be automatically centered to enable the flow rate regulating portion 512A of the valve needle 51A to be more easily engaged with the valve port 21A.

Similarly, when actually disposed, the transmission member 4A can be set with a predetermined radial displacement relative to the movable connecting member 6A, so that the transmission shaft 41A and the upper engaging member 42A can be adjusted to the center.

The specific configurations of the transmission member 4A, the needle member 5A, and the movable connecting member 6A in the present embodiment are described in detail above, and the operation of the electric valve in the present embodiment from the open valve state shown in fig. 2 to the closed valve state shown in fig. 5 will be described in detail below with reference to fig. 16 and 17.

The valve-open state shown in fig. 2 to the valve-closed state shown in fig. 3 is moved as follows:

as shown in fig. 1 and 2, the electric valve is in an open state in which the needle 51A is separated from the valve port 21A. In this open state, the large-diameter ring portion 421A (first radial projection) of the upper engaging piece 42A of the transmission member 4AThe projection) abuts against the first annular portion 631A of the upper member 63A of the movable connecting part 6A, whereby the transmission part 4A supports the movable connecting part 6A in a suspended manner. There is a preset axial displacement t between the lower end surface of the large-diameter ring 421A and the first ring 622A (stopper) of the connecting body 62A₁. The lower end surface portion of the second suspending portion 521A of the lower engaging piece 52A abuts on the upper end surface portion 6411A of the second annular portion 641A (second radial projecting portion) of the lower member 64A, and the needle member 5A is suspended and supported by the movable connecting member 6A.

From this valve-opened state, in the process that the transmission member 4A is driven by the drive member 3A of the electric valve to move in the valve-closing direction until the flow rate adjustment portion 512A of the needle 51A comes into contact with the valve port 21A to close the valve port 21A, that is, the first valve-closed state shown in fig. 3 is reached, the transmission member 4A, the movable connecting member 6A, the elastic element 7A, and the needle member 5A can be seen as a whole to move together in the axial direction in the valve-closing direction, and the relative positional relationship among the transmission member 4A, the movable connecting member 6A, the needle member 5A, and the elastic element 7A coincides with that in the valve-opened state shown in fig. 2, but moves down together with respect to the valve body 2A.

In this process, on the one hand, there is no wear between the second guide inner wall 602A and the second guide outer wall 502A, since no axial relative movement occurs between the movable connecting member 6A and the needle member 5A. On the other hand, the movable connecting part 6A and the valve core sleeve 2A are axially and relatively moved, and the first guide inner wall 201A and the first guide outer wall 601A are in guide fit. Although abrasion occurs between the first guide inner wall 201A and the first guide outer wall 601A during the guide engagement, the generated frictional force is generated only by the self-weight of the movable connecting member 6A, and the degree of abrasion is small. On the other hand, there is a preset axial displacement t between the lower end surface of the large diameter ring portion 421A of the upper engaging piece 42A and the stopper of the connecting body 62A₁The elastic element 7A is not compressed and does not generate a spring force for pressing the needle member 5A against the valve port 21A, the needle member 5A closes the valve port 21A by its own weight, the gap between the needle 51A and the valve port 21A is not affected by the spring force of the elastic element 7A, and even if the needle 51A rotates, the valve port 21A is only affected by the needle member 5A and the movable element 7AThe friction force caused by the weight of the movable connecting member 6A is small in the wear of the contact surface of the needle 51A with the valve port 21A.

The operation of the first valve closing state shown in fig. 3 to the second valve closing state shown in fig. 4 is as follows:

from the start of the valve-closed state shown in fig. 3 in which the valve needle 51A closes the valve port 21A, a pulse is applied in the valve-closing direction, and the transmission member 4A is further driven by the drive member 3A to move in the axial direction toward the valve-closing direction due to the preset displacement amount t between the large-diameter ring portion 421A (first radial projecting portion) and the first annular protrusion 622A (stopper portion) of the upper engaging member 42A₁The positional relationship among the movable connecting member 6A, the needle member 5A, and the valve port 21A is not changed. That is, the valve core sleeve 2A and the movable connecting part 6A and the valve needle part 5A do not move relatively in the axial direction, and only the transmission part 4A moves downward in the axial direction and tends to move in the valve closing direction. When the transmission member 4A moves down to the end point of the second closed valve state, the large-diameter ring portion 421A (first radial protruding portion) of the upper engaging member 42A abuts against the first annular portion 622A (stopper portion) of the connecting body 62A. That is, the transmission member 4A is moved in the valve closing direction by a displacement amount smaller than or equal to the predetermined displacement amount t in the self-closing state₁The process (2) is in a second valve-closed state. FIG. 4 shows that the transmission member 4A is displaced by an amount equal to the predetermined displacement t₁The time-point state diagram is the moment when the large-diameter ring portion 421A of the upper engaging piece 42A is just in contact with but not biasing the first ring portion 622A (stopper portion) of the movable connecting member 6A.

In this process, on the one hand, no friction force acts between the first guide inner wall 201A and the first guide outer wall 601A, and between the second guide inner wall 602A and the second guide outer wall 502A; on the other hand, the elastic element 7A does not generate a spring force that presses the needle member 5A toward the valve port 21A. That is, the contact surface between the needle 51A and the valve port 21A is not affected by the spring force of the elastic element 7A. In the entire valve-closed state two, even if the valve needle 51A rotates, the valve port 21A is subjected to only the frictional force due to the weight of the valve needle member 5A and the movable connecting member 6A, which causes little wear on the contact surface between the valve needle 51A and the valve port 21A.

The operation from the second valve-closed state shown in fig. 4 to the third valve-closed state shown in fig. 5 is as follows:

when a pulse is applied in the valve closing direction from the second valve closing state shown in fig. 4, the driving member 3A further drives the transmission member 4A to move in the axial direction toward the valve closing direction, and the large-diameter ring portion 421 (first radial protruding portion) of the upper engaging member 42A of the transmission member 4A abuts against the first annular portion 622A (stopper portion) of the connecting body 62A, so that the movable connecting member 6A moves downward together with the transmission member 4A in the downward movement of the transmission member 4A, and the elastic element 7A is compressed and deformed to generate a spring force that presses the valve needle 51A toward the valve port 21A, and the spring force causes the valve needle 51A to more reliably seal the valve port 21A, tightly close the valve port 21A, and thus improving the valve closing reliability.

In this process, since the elastic element 7A is compressed, if the frictional force between the needle 51A and the transmission member 4A is larger than the frictional force between the needle 51A and the valve port 21A, the needle 51A rotates together with the transmission member 4A with respect to the valve port 21A, and the portion of the valve port 21A that contacts the needle 51A is worn. If the frictional force between the valve needle 51A and the transmission member 4A is smaller than the frictional force between the valve needle 51A and the valve port 21A, the valve needle 51A does not rotate with the transmission member 4A, that is, the portion of the valve port 21A that contacts the valve needle 51A does not wear significantly. Therefore, in order to reduce the frictional force between the needle 51A and the transmission member 4A, the aforementioned washer 53A is provided.

The electric valve of the scheme is provided with the first guide inner wall 201A, the first guide outer wall 601A, the second guide inner wall 602A and the second guide outer wall 502A, the valve closing reliability of the valve is improved through the two groups of double-guide mechanisms, and the valve needle component acts stably. Further, as is clear from the operation process of the electrically-operated valve from the valve-opened state to the valve-closed state three described above, when the movable link member 6A and the valve body sleeve 2A and the movable link member 6A and the needle member 5A are relatively moved in the axial direction in the valve-opened state three, frictional forces are generated between the first guide inner wall 201A and the first guide outer wall 601A and between the second guide inner wall 602A and the second guide outer wall 502A, and these frictional forces act as resistance to the valve opening during the valve opening process, and may cause the valve opening jam. In order to reduce the valve opening resistance, the elastic element 7A is provided outside the needle member 5A, and one end thereof abuts against the movable connection member and the other end abuts against the needle member 5A. At the moment of opening the valve (i.e., during the movement from the second closed state to the first closed state), the spring force of the elastic element 7A can be used to overcome the frictional force, thereby facilitating the opening of the valve and improving the reliability of the opening of the valve. In addition, in the embodiment, the elastic element 7A is disposed below the first and second sets of guiding mechanisms, which is more favorable for overcoming the friction between the first guiding inner wall 201A and the first guiding outer wall 601A and the friction between the second guiding inner wall 602A and the second guiding outer wall 502A. In addition, since the transmission member supports the movable connection member in a suspended manner, and the movable connection member supports the valve needle member in a suspended manner, the frictional force between the valve needle 51A and the valve port 21A is only a force caused by the weight of the valve needle member 5A and the movable connection member 6A at the moment when the valve needle 51A closes the valve port 21A, the moment when the valve needle 51A is separated from the valve port 21A, and the second valve closing state, the wear between the contact portions of the valve needle 51A and the valve port 21A is extremely small even during the repetitive operation of the electric valve, and the internal leakage in the fully closed state of the electric valve is reduced. In the same manner as when the needle 51A is separated from the valve port 21A during valve opening, at the moment when the needle 51A and the valve port 21A are separated from each other, the frictional force between the needle 51A and the valve port 21A is caused only by the weight of the needle member 5A and the movable connection member 6A, and even if the valve is repeatedly operated, the amount of wear at the contact portion between the needle 51A and the valve port 21A is extremely small, thereby further improving the sealing reliability of the valve.

Before the valve is closed, the valve needle member 5A and the transmission member 4A are not urged by the spring force of the elastic element 7A, the valve needle member 5A and the movable connection member 6A do not rotate together with the transmission member 4A, and there is almost no friction between the valve core sleeve 2A and the movable connection member 6A and between the movable connection member 6A and the valve needle member 5A, so that the valve opening resistance can be further reduced and the valve opening reliability can be improved.

It should be noted that, in this embodiment, in order to improve the wear resistance between the first guiding inner wall 201A and the first guiding outer wall 601A and between the second guiding inner wall 602A and the second guiding outer wall 502A, the valve core sleeve 2A and the connecting body 62A may be respectively processed by two different materials, for example, one is processed by using a brass material, and the other is processed by using a stainless steel material. Similarly, the connecting body 62A and the valve needle 51A can be made of two different materials, such as brass and stainless steel. Alternatively, the first guide inner wall 201A and the first guide outer wall 601A and the second guide inner wall 602A and the second guide outer wall 502A may be plated.

The method for manufacturing the electric valve in the embodiment is explained below, and specifically includes the following steps:

a1, preparing an upper valve body 12A, a lower valve body 13A and a valve core sleeve 2A of a valve body part 1A, preparing a rotor 31A, preparing a transmission part 4A, preparing a valve needle part 5A, preparing a movable connecting part 6A and preparing a nut part 8A;

a2 is a first assembly in which an elastic element 7A, a transmission member 4A, a movable connection member 6A, and a needle member 5A are assembled, the transmission member 4A and the movable connection member 6A are suspended, the movable connection member 6A and the needle member 5A are suspended, one end of the elastic element 7A is brought into contact with the movable connection member 6A, the other end is brought into contact with the needle member 5A, and the movable connection member 6A and the needle member 5A are slidably fitted to each other through a gap between a second guide inner wall 602A and a second guide outer wall 502A. Step a2 further includes:

a21 is formed by fitting the elastic element 7A around the outer periphery of the needle 51A so that the lower end thereof abuts against the first stepped portion 514A of the needle 51A, and fitting the washer 53A and the lower member 64A around the outer edge of the needle 51A and above the elastic element 7A, so that the upper end of the elastic element 7A directly abuts against the washer 53A and indirectly abuts against the lower member 64A, and thereafter, the lower engaging piece 52A is engaged with the annular groove 5111A of the body 511A of the needle 51A so that the upper end surface thereof abuts against the upper end surface of the annular groove 5111A and the lower end thereof abuts against the upper end surface of the lower member 64A. That is, in this step, under the elastic force of the elastic element 7A and the engaging action of the lower engaging piece 52A, the valve needle 51A, the elastic element 7A, the washer 53A, the lower member 64A and the lower engaging piece 52A are assembled to form the first sub-assembly. In the first sub-assembly, one end of the elastic element 7A abuts against the lower member 64A, and the other end abuts against the needle 51A. In this step, the assembling order of the parts is not limited as long as the first sub-assembly can be assembled.

The upper engaging piece 42A is fitted and welded to the lower end portion of the transmission shaft 41A, and then the upper member 63A is fitted to the outer edge portion of the transmission shaft 41A, forming a second sub-assembly. In this step, the upper member 63A may be sleeved on the outer edge of the transmission shaft 41A, and then the upper engaging member 42A may be sleeved on the lower end of the transmission shaft 41A and welded and fixed thereto.

A22 is formed by press-fitting the upper member 63A and the lower member 64A to the upper opening portion and the lower opening portion of the connecting body 62A, respectively, as a first assembly, and in the first assembly, the second guide inner wall 602A of the inner wall of the connecting body 62A is clearance-slidably fitted to the second guide outer wall 502A of the outer wall of the guide portion 513A of the needle 51A, and the first radially projecting portion of the transmission shaft 41A is made to support the first suspending portion of the movable coupling member 6A in a suspended manner, and the second radially projecting portion of the movable coupling member 6A is made to support the second suspending portion of the lower engaging member 52A in a suspended manner. That is, the transmission member 4A supports the movable connecting member 6A in a suspended manner, and the movable connecting member 6A supports the needle member 5A in a suspended manner. One end of the elastic element 7A abuts against the lower member 64A, and the other end abuts against the needle 51A. Further, in order to secure the assembling strength of the upper member 63A and the lower member 64A with the connecting body 62A, after the upper member 63A and the lower member 64A are press-fitted to the upper opening portion and the lower opening portion of the connecting body 62A, respectively, the upper member 63A and the lower member 64A may be also weld-fixed with the connecting body 62A.

A3 fixes the lower valve body 13A and the valve core sleeve 2A as a second component by furnace welding. Of course, it is understood that other welding methods may be used to join the parts during this step. In this step, the lower valve body 13A, the valve core sleeve 2A, the first connecting pipe and the second connecting pipe may be welded and fixed to serve as a second component, so as to save the processing cost, that is, the valve core sleeve 2A is placed in the lower valve body 13A, the lower end of the valve core sleeve extends out of the lower valve body 13A, the second connecting pipe is welded to the outer edge of the lower end of the valve core sleeve 2A, and the first connecting pipe is welded to the lower valve body 13A.

A4, assembling the first assembly and the second assembly, specifically, extending the valve needle part 5A of the first assembly into the valve core sleeve 2A from the lower end to make the first guiding inner wall 201A of the inner wall of the valve core sleeve 2A and the first guiding outer wall 601A of the outer wall of the connecting body 62A in clearance sliding fit;

a5 is characterized in that a nut part 8A is sleeved on the outer edge of a transmission shaft 41A and is in threaded connection with the transmission shaft 41A, the nut part 8A is welded and fixed with a lower valve body 13A, and a rotor 31A is welded and fixed with the transmission shaft 41A;

a6 welds and fixes the upper valve body 12A and the lower valve body 13A, thereby completing the manufacture of the motor-operated valve of the present embodiment.

It should be noted that, when the transmission part 4A adopts an integral structure as shown in the following second embodiment, the assembly of the transmission part with the upper member can be understood with reference to the following, and the description is not repeated here.

It should be noted that, it is acceptable to perform step A3 after step a2 is performed, or to perform step a2 after step A3 is performed.

Example two:

FIG. 9 is a schematic cross-sectional view of a second embodiment of an electrically operated valve of the present invention, wherein the valve is in a fully open state, and FIG. 10 is a view I of FIG. 9₂A partially enlarged view of a portion, and FIG. 11 is a view I of the motor-operated valve shown in FIG. 9 in a state where the valve is closed₂A partially enlarged view of a portion, and FIG. 12 is a view showing a state I in which the motor-operated valve shown in FIG. 9 is in a second closed state₂A partially enlarged view of a portion, and FIG. 13 is a view I of the motor-operated valve shown in FIG. 9 in a closed state₂A partial enlarged view of a portion, and fig. 14 is a structural schematic view of the movable connecting part in fig. 9; FIG. 15 is a schematic structural diagram of the needle assembly of FIG. 9, and FIG. 16 is a schematic view showing the operational characteristics of the electrically operated valve of the present invention, wherein t represents t in the present embodiment₂Fig. 17 is a schematic view showing the operational characteristics of the motor-operated valve according to the present invention. In the following of the present embodiment, the valve opening state shown in fig. 10 is defined as "valve opening state", in which the transmission member 4B and the movable connecting member 6B have a relatively movable distance in the axial direction, which is marked by t₂I.e. the predetermined displacement amount in the present embodiment; define the valve needle part 5B closing the valve port 21B and the transmission part 4B and the movable connection partThe member 6B is still axially retained by a relatively movable distance t₂Is in a "valve-closed state one", as shown in fig. 11; an axial displacement amount defined from "the valve-closed state one" shown in fig. 11 to a movement of the transmission member 4B in a direction tending to close the valve is equal to or less than a preset displacement amount t₂During the period of "second closed valve state", FIG. 12 shows that the transmission member is moved from the first closed valve state by an axial displacement equal to t₂A schematic structural diagram of the time; the axial displacement quantity of the transmission component 4B from the first valve closing state to the valve closing direction is larger than the preset displacement quantity t₂The valve is closed, i.e., in the third state, as shown in fig. 13.

As shown in fig. 9 and 10, the electric valve includes a valve body member 1B including a valve chamber 11B, a drive member 3B, a transmission member 4B, a needle member 5B, a movable connecting member 6B, an elastic element 7B, and a nut member 8B. The valve body component 1B comprises an upper valve body 12B, a lower valve body 13B and a valve core sleeve 2B, the lower valve body 13B is connected with a first connecting pipe, and the upper valve body 12B and the lower valve body 13B are welded and fixed to form a valve cavity 11B. The valve core sleeve 2B and the lower valve body 13B are of split structures, and are fixed by welding, so that the valve core sleeve 2B and the lower valve body 13B can also be of an integrated structure, namely, are processed into a part. The valve core sleeve 2B is provided with a valve port 21B and is substantially disposed in the valve cavity 11B, and the lower end portion thereof extends out of the valve cavity 11B and is connected to a second connecting pipe, that is, in this embodiment, the valve core sleeve 2B is partially disposed in the valve cavity 11B, and the valve core sleeve 2A is substantially axially through. The movable connecting part 6B is at least partially arranged in the valve core sleeve 2B and can be in clearance sliding fit with the valve core sleeve 2B. The movable connecting part 6B is connected with the transmission part 4B in a hanging mode, and the movable connecting part 6B can be driven by the transmission part 4B to move axially relative to the valve core sleeve 2B. One end of the movable connecting part 6B extends into the valve needle part 5B, the movable connecting part 6B supports the valve needle part 5B, the movable connecting part 6B is connected with the valve needle part 5B in a hanging mode, the valve needle part 5B can be driven by the movable connecting part 6B to move axially relative to the valve core sleeve 2B, the elastic element 7B is sleeved on the outer peripheral portion of the valve needle part 5B, one end of the elastic element 7B is abutted to the movable connecting part 6B, and the other end of the elastic element 7B is abutted to the valve needle part 5B.

The nut member 8B includes a nut 81B having a female screw hole, a spring rail 82B fixed to an outer edge portion of the nut 81B, and a slide ring 83B, and the slide ring 83B is slidable in the axial direction on the spring rail 82B. The nut 81B is fixedly connected with the upper end of the lower valve body 13B through a connecting piece 84B, sleeved on the periphery of the transmission part 4B, and in threaded transmission connection with the transmission part 4B. The driving member 3B specifically includes an electromagnetic coil 34B and a rotor 31B, a coupling seat 32B fixedly coupled to the rotor 31B, and a stopper rod 33B fixedly coupled to the coupling seat 32B. The electromagnetic coil 34B is fixedly connected to the valve body member 1B via a connecting bracket (not shown). The rotor 31B of the drive member 3B is provided on the outer periphery of the nut member 8B, and the rotor 31B is fixedly connected to the power transmission member 4B and drives the power transmission member 4B to move in the axial direction of the valve body member 1B in cooperation with the electromagnetic coil 34B. When the driving member 3B drives the transmission member 4B to reciprocate along the axial direction of the valve body member 1B, the needle member 5B and the movable connecting member 6B can be operated to adjust the opening degree of the valve port 21B of the electric valve.

In order to align the valve needle component 5B with the valve port 21B more accurately and improve the reliability of the valve closing, in the electric valve of the present embodiment, the valve core sleeve 2B includes a first guiding inner wall, and the movable connecting component 6B includes a first guiding outer wall slidably fitted with a guiding clearance of the first guiding inner wall. The movable connecting part 6B further comprises a second guiding outer wall and the needle part 5B comprises a second guiding inner wall in clearance sliding fit with the second guiding outer wall. By definition, the first guiding inner wall and the first guiding outer wall form a first group of guiding mechanisms, and the second guiding inner wall and the second guiding outer wall form a second group of guiding mechanisms.

Specifically, as shown in fig. 10, 11, 15, and 16, the spool case 2B has a cylindrical structure with an inner wall having a first through hole in which the movable connecting member 6B is disposed, the inner wall of the first through hole including the first guide inner wall 201B. The upper end of the movable connecting member 6B protrudes from the upper end of the valve core housing 2B, i.e., the movable connecting member 6B is partially disposed within the valve core housing 2B. The movable connecting part 6B includes a first guiding outer wall 601B in clearance sliding fit with the first guiding inner wall 201B, and the valve core sleeve 2B and the movable connecting part 6B are in guiding fit through the first guiding inner wall 201B and the first guiding outer wall 601B, that is, the first guiding inner wall 201B of the valve core sleeve 2B guides the movable connecting part 6B.

The outer wall of the movable connecting part 6B further comprises a second guiding outer wall 602B, and the inner wall of the needle part 5B is provided with a second guiding inner wall 502B which is in clearance sliding fit with the second guiding outer wall 602B. The movable connecting part 6B is guided to engage with the needle part 5B through the second guide outer wall 602B and the second guide inner wall 502B. The second guide outer wall 602B of the movable connecting member 6B guides the needle member 5B.

In the electric valve of the embodiment, the valve core sleeve 2B guides the movable connecting part 6B through the guiding cooperation of the first guiding inner wall 201B and the first guiding outer wall 601B, and the movable connecting part 6B and the valve needle part 5B are guided through the cooperation of the second guiding inner wall 502B and the second guiding outer wall 602B, so that the valve needle part 5B is more accurately aligned with the valve port 21B through the arrangement of the two sets of guiding mechanisms, and the reliability of valve closing is improved.

Further, in the final stage of closing the valve (i.e., in the process from the second valve closing state to the third valve closing state described above), friction forces are generated between the first guide inner wall 201B and the first guide outer wall 601B and between the second guide outer wall 602B and the second guide inner wall 502B, which may adversely affect opening of the valve, so in order to improve reliability of opening the valve, the electric valve of the present embodiment further includes an elastic element 7B, and the elastic element 7B is sleeved outside the valve needle member 5B, and one end of the elastic element is abutted against the movable connecting member 6B, and the other end of the elastic element is abutted against the valve needle member 5B. Thus, at the instant of opening the valve of the electric valve (i.e., during the third state of closing the valve to the second state of closing the valve), the elastic force of the elastic element 7B exerts an upward pushing force on the movable connecting part 6B, which helps to overcome the aforementioned frictional force, so that the movable connecting part 6B is more easily moved upward, thereby avoiding the valve opening jam caused by the aforementioned friction, facilitating the opening of the valve, stabilizing the movement of the needle part, reducing the wear between the contact portions of the needle part 5B and the valve port 21B, reducing the internal leakage rate of the electric valve, and improving the sealing performance of the valve.

Further, the transmission member 4B includes a first radial projecting portion, and the movable connecting member 6B includes a first hanging portion, the first radial projecting portion suspendedly supporting the first hanging portion, the first radial projecting portion being capable of abutting against or separating from the first hanging portion to cause the transmission member 4B to suspendedly support the movable connecting member 6B, that is, to cause the transmission member 4B to be suspendedly connected with the movable connecting member 6B. The movable connecting part 6B further includes a second radial projection, and the needle member 5B includes a second hanging portion, the second radial projection suspendedly supporting the second hanging portion, the second radial projection being capable of abutting against or separating from the second hanging portion to suspendedly support the needle member 5B by the movable connecting part 6B, that is, to suspendedly connect the movable connecting part 6B with the needle member 5B. The movable connecting part 6B includes a stopper portion disposed below the first radial projecting portion, and the first radial projecting portion can abut against the stopper portion when the transmission part 4B tends to move in the valve closing direction. When the transmission component 4B moves to the first radial protruding portion to abut against the first hanging portion and the second radial protruding portion to abut against the second hanging portion, the transmission component 4B can drive the movable connecting component 6B to move upwards along the axial direction, and the movable connecting component 6B can drive the valve needle component 5B to move upwards along the axial direction.

When the transmission member 4B moves from the valve opening state to the valve closing direction, the movable connecting member 6B and the valve needle member 4B move downward with the transmission member 4B due to their own gravity as the transmission member 4B moves downward, that is, the movable connecting member 6B and the valve needle member 4B move together until the valve needle member 5B closes the valve opening 21B in the valve closing state. When the valve needle component 5B closes the valve port 21B, the valve needle component moves by a preset displacement t to the direction that the transmission component 4B tends to close the valve₂Meanwhile, the elastic element 7B does not generate a spring force that urges the needle member 5B toward the valve port 21A; when the valve needle component 5B closes the valve port 21B, the valve needle component moves by a preset displacement t in the valve closing direction from the beginning to the beginning of the movement of the transmission component 4B₂In the above case, that is, after the transmission member 4B moves in the valve closing direction until the first radial protrusion abuts against the stopper, the transmission member 4B pushes the movable connection member 6B to move in the valve closing direction, and the elastic element 7B pushes the needle member 5B toward the valve port 21B.

Thus, the displacement amount of the needle member 5B from the time of closing the valve port 21B to the time of moving the transmission member 4B in the valve-closing direction does not exceed the preset displacement amount t₂During the course ofAnd at the moment of opening the valve, the friction force generated between the valve needle component 5B and the valve port 21B is the force caused by the gravity of the valve needle component 5B, the abrasion loss of the contact surface of the valve needle component 5B and the valve port 21B is small, the internal leakage of the electric valve is further reduced, the leakage of the valve port in a fully closed state can be avoided even if the electric valve operates repeatedly, and the sealing performance of the valve is improved.

Before the valve is closed, the spring force of the elastic element 7B is not applied between the needle member 5B and the transmission member 4B, the needle member 5B and the movable connection member 6B do not rotate together with the transmission member 4B, and there is almost no frictional force between the valve body sleeve 2B and the movable connection member 6B and between the movable connection member 6B and the needle member 5B, so that the valve opening resistance can be further reduced.

specifically, when the transmission member 4B moves from the valve-opening state shown in fig. 10 to the valve-closing direction in which the needle member 5B closes the valve port 21B, i.e., the valve-closing state shown in fig. 11, the movable connecting member 6B and the needle member 5B also move together with the transmission member 4B under the self-weight force, and the first guide inner wall 201B and the second guide outer wall 601B are in axial relative movement guide engagement. At this time, although the first guide inner wall 201B and the first guide outer wall 601B are worn away, the friction force is generated only by the self-weight of the movable connecting member 6B, and the degree of wear is small. Also, the elastic element 7B does not generate a spring force that presses the needle member 5A against the valve port 21A.

Subsequently, during the second valve closing state, i.e. during the movement from the state shown in fig. 11 to the state shown in fig. 12, the transmission member 4B moves downwards, i.e. the transmission member 4B moves at the predetermined displacement t relative to the movable connecting member 6B₂Moving in the axial direction towards the valve closing direction. In the process that the transmission component 4B moves downwards, the positions of the movable connecting component 6B and the valve needle component 5B are kept still, the first guide inner wall 201B and the first guide outer wall 601B are in guide fit with each other, the second guide outer wall 602B and the second guide inner wall 502B do not have relative displacement, and no friction force is generated. The elastic element 7B does not generate a spring force for pressing the needle member 5B in the direction of the valve port 21B, and the needle member 5B and the valve element 21B are connected to each otherThe contact portion of the valve port 21B is not worn.

Then, during the valve closing state three times, when the transmission member 4B continues to move in the valve closing direction to the state shown in fig. 13 in the state shown in fig. 12, the transmission member 4B pushes the movable connecting member 6B and the movable connecting member 6B pushes the elastic element 7B to move together in the valve closing direction. In the process, the movable connecting part 6B moves downwards relative to the valve core sleeve 2B, the first guide inner wall 201B and the first guide outer wall 601B are in guide fit, and the first guide inner wall 201B and the first guide outer wall 601B are abraded to generate friction force. Meanwhile, the movable connecting part 6B moves downward relative to the needle member 5B, and is guided and engaged by the second guide outer wall 602B and the second guide inner wall 502B, and the second guide outer wall 602B and the second guide inner wall 502B are worn away, thereby generating a frictional force. In this process, the elastic element 7B is deformed by pressure to generate a spring force that presses the needle member 5B against the valve port 21B, thereby further ensuring the valve-closing reliability and improving the sealing performance when the valve is closed.

In the valve opening process, when the electrically operated valve moves from the state shown in fig. 13 to the state shown in fig. 12, that is, from the third closed state to the second closed state shown in fig. 12, the movable connecting member 6B is pressed upward by the spring force of the elastic element 7B, so that the frictional force generated in the third closed state of the valve can be easily overcome to avoid the valve opening jam due to the friction. In the valve closed state two to the valve fully opened state shown in fig. 10, since almost no friction is generated between the first guide inner wall 201B and the first guide outer wall 601B and between the second guide outer wall 602B and the second guide inner wall 502B, the valve can be freely opened without the valve opening jam.

In the whole process, the electric valve realizes the guiding of the valve core sleeve 2B to the movable connecting part 6B through the matching of the first guiding inner wall 201B and the first guiding outer wall 601B, and realizes the guiding of the movable connecting part 6B to the valve needle part 5B through the matching of the second guiding inner wall 502B and the second guiding outer wall 602B, so that the valve closing reliability and the valve opening reliability are improved, and the sealing performance during valve closing is also improved.

on one hand, the valve needle component 5B can be more accurately aligned to the valve port 21B in the moving process through the matching of the first guide inner wall 201B and the first guide outer wall 601B and the guide matching of the second guide outer wall 602B and the second guide inner wall 502B, the valve closing reliability is improved, and the motion stability of the valve needle component is improved.

On the other hand, since the electric valve generates a frictional force between the first guide inner wall 201B and the first guide outer wall 601B and between the second guide outer wall 602B and the second guide inner wall 502B in the third stage of the valve closing state, and this frictional force affects the valve opening operation performance, in the present embodiment, the elastic element 7B is provided outside the movable link 6B, and one end thereof abuts against the movable link 6B, and the other end thereof abuts against the needle member 5B, so that the movable link 6B is pressed upward by the spring force of the elastic element 7B during the valve opening process, and this frictional force is favorably overcome to avoid the valve opening jam due to this frictional force, thereby improving the valve opening reliability.

The transmission member 4B is connected to the movable connection member 6B in a suspended manner, the movable connection member 6B is connected to the valve needle member 5B in a suspended manner, and the valve needle member 5B starts to move by a predetermined displacement t in a valve closing direction from the time when the valve needle member 5B closes the valve port 21B to the time when the transmission member 4B tends to move in a valve closing direction₂Meanwhile, the elastic element 7B does not generate a spring force for pressing the valve needle member 5B toward the valve port 21B, and the valve needle member 5B starts to move by the preset displacement t until the transmission member 4B approaches the valve closing direction when closing the valve port 21B₂In the above, the elastic element 7B generates a spring force that presses the needle member 5B against the valve port 21B. Thus, the contact portion between the valve needle member 5B and the valve port 21B is worn only in the three-stage process of the valve closing state, the contact portion between the valve needle member 5B and the valve port 21B is not worn in the two-stage process of the valve opening state to the first valve closing state and the first valve closing state to the second valve closing state, so that the internal leakage between the valve needle member 5B and the valve port 21B is reduced, the same applies when the valve needle 51B is separated from the valve port 21B in the valve opening process, and the frictional force between the valve needle 51B and the valve port 21B is only the valve needle member at the moment of separation of the valve needle 51B and the valve port 21B5B and the movable connecting member 6B are subjected to their own weights, and even if the valve is repeatedly operated, the amount of wear at the contact portion between the needle 51B and the valve port 21B is extremely small, and the valve sealing performance is improved.

The specific structural design of the transmission member 4B, the needle member 5B, and the movable connecting member 6B in the present embodiment will be described in detail below.

As shown in fig. 9 to 11 and fig. 14, the movable connecting member 6B includes a connecting body 62B, an upper end portion of the connecting body 62B has an upper opening portion 67B, and a bottom portion 671B of the upper opening portion 67B forms a stopper in this embodiment. The lower end of the connecting body 62B further has a blind hole-shaped lower insertion hole 68B, and the outer wall of the connecting body 62B may be cylindrical and include a first guide outer wall 601B, and the first guide outer wall 601B is capable of being in clearance sliding fit with the first guide inner wall 201B of the valve core sleeve 2B.

The movable connecting member 6B further includes an upper member 63B fixed to the upper opening portion 67B and a substantially rod-shaped lower member 64B having one end inserted into the lower insertion hole 68B and fixedly connected to the connecting body 68B. The upper member 63B is a first annular member having an axial through hole, which is sleeved on the outer edge of the transmission component 4B and fixed to the upper opening 67B of the connecting body 62B by welding, and the upper member 63B is fixedly connected to the connecting body 62B to form a receiving hole 61B. The first annular portion 631B of the upper member 63B having the through hole serves as the first hanging portion of the present embodiment.

When the upper member 63B is welded and fixed to the upper opening of the connecting body 62B, in order to avoid the influence of the welding position and the vicinity thereof on the guiding fit between the first guiding inner wall 201B and the first guiding outer wall 601B after the upper member 63B is welded to the upper opening 67B, the inner wall of the valve core sleeve 2B is designed to include a first small diameter portion 20B, the first small diameter portion 20B includes a first guiding inner wall 201B, and a first diameter-enlarged portion 23B having a diameter larger than that of the first small diameter portion 20B is provided above the first small diameter portion 20B; alternatively, the connecting body 62B is designed such that the outer wall includes a first large-diameter portion 624B and a first reduced-diameter portion 625B provided above the first large-diameter portion 624B, the first large-diameter portion 624B includes a first guide outer wall 601B, and the first reduced-diameter portion 625B is welded to the upper member 63B; alternatively, the inner wall of the spool case 2B is designed to include the first small diameter portion 20B, the first small diameter portion 20B includes the first guide inner wall 201B, the first diameter-enlarged portion 23B having a larger diameter than the first small diameter portion 20B is provided above the first small diameter portion 20B, and the connecting body 62B is designed such that the outer wall includes the first large diameter portion 624B and the first diameter-reduced portion 625B provided above the first large diameter portion 624B, the first large diameter portion 624B includes the first guide outer wall 601B, and the first diameter-reduced portion 625B is welded and fixed to the upper member 63B.

The upper end of the lower member 64B is fixedly connected to the connecting body 62B by press-fitting or welding or press-fitting and welding, the lower member 64B includes an insertion portion 641B inserted into the lower insertion hole 68B, a second radial projection 642B formed to extend in the radial direction of the lower end portion of the lower member 64B, and a base portion 643B connected to the insertion portion 641B and the first radial projection 642B, and the second guide outer wall 602B of the present embodiment is provided on the outer wall of the base portion 643B. The term "connected" as used herein includes a structure in which the lower member is designed as a separate structure and then fixedly connected by welding or the like, and also includes a structure in which the lower member is directly integrally processed.

As shown in fig. 9 and 11, the transmission member 4B includes a transmission shaft 41B, a lower end portion of the transmission shaft 41B is located in the accommodation hole 61B, and the lower end portion of the transmission shaft 41B extends in the radial direction to form an annular projection 411B, and the annular projection 411B forms a first radial projection in this embodiment. The upper end surface portion of the first radial projecting portion can abut against or be separated from the lower end surface portion of the first suspending portion 631B, and the lower end surface portion of the first radial projecting portion can abut against or be separated from the stopper portion 671B. When the transmission shaft 41B moves in the valve closing direction until the first radial protrusion abuts against the stopper portion 671B, the transmission shaft 41B can push the connecting body 62B to move in the valve closing direction, and the connecting body 62B pushes the elastic element 7B to cause the elastic element 7B to generate a spring force that pushes the valve needle member 5B toward the valve port 21B. Of course, it is understood that the transmission member 4B in the present embodiment may be provided in a split structure similar to that of the first embodiment.

The first radial projection 411B of the transmission member 4B is axially movable in the receiving hole 61B. The first overhang of the upper member 63B in the first state of the motor-operated valve being opened and closedThe hanging portion 631B abuts against the first radial protrusion 411B of the transmission shaft 41B, the transmission shaft 41B supports the movable connecting part 6B in a hanging manner, and at this time, the axial distance between the first radial protrusion 411B and the stopping portion 671B is the preset displacement t in the embodiment₂The predetermined displacement t₂Can be set according to actual needs. In practice, the transmission shaft 41B and the upper engaging member 42B can have a predetermined radial displacement relative to the connecting body 62B, so that the transmission shaft 41B can be self-aligned to the center.

As shown in fig. 12 and 15, the valve needle component 5B includes a valve needle 51B and a lower engaging member 52B fixedly connected to the valve needle 51B, and the valve needle 51B further includes a main body portion 511B having an open cavity with an upper opening, and a flow rate adjusting portion 512B disposed below the main body portion 511B and contacting or separating with the valve port 21B. The lower engaging piece 52B is fixedly connected to the main body 511B to form a first connecting cavity 55B. The second guide inner wall 502B is provided on the inner wall of the lower engaging piece 52B. The lower end 521B of the lower engaging piece 52B forms a second hanging portion. The main body 511B and the lower engaging piece 52B together form a first stepped portion 514B. The first step portion 514B is provided with a washer 53B. The lower engaging piece 52B is substantially in the shape of a tube passing through in the axial direction, the lower engaging piece 52B is fitted around the outer edge of the base 643B of the lower member 64B, the elastic element 7B is fitted around the outer peripheral portion of the lower engaging piece 52B, one end of the elastic element 7B abuts against the lower end surface portion of the connecting body 62B, and the other end abuts directly against the washer 53B and then indirectly abuts against the main body portion 511B. Here, it is understood that the aforementioned washer 53B may be disposed between one end of the elastic element 7B and the lower end surface portion of the connecting body 62B, or the washers 53B may be disposed between one end of the elastic element 7B and the lower end surface portion of the connecting body 62B and on the first stepped portion 514B, and the washer 53B functions to reduce the friction between the elastic element 7B and the lower member 64B or the valve needle 51B, so as to reduce the friction between the valve needle part 5B and the transmission part 4B, and prevent the valve needle 51B from rotating with the transmission part 4B, so as to reduce the wear of the contact portion of the valve needle 51B and the valve port 21B.

The specific structures of the transmission member 4B, the needle member 5B and the movable connecting member 6B in the present embodiment are described in detail above, and the following description is made with reference to fig. 16 to 17The operation of the motor-operated valve of the present embodiment from the open valve state shown in fig. 10 to the closed valve state shown in fig. 13 will be described in detail, and when applied to the present embodiment, t in fig. 16 represents t₂. Fig. 17 is a second schematic view showing the operation characteristics of the electric valve according to the present invention, which shows the relationship between the number of pulses of the electromagnetic coil and the frictional force of the first group guide means and the second group guide means.

The movement from the valve-open state shown in fig. 10 to the valve-closed state shown in fig. 11 is as follows:

as shown in fig. 9 and 10, the electric valve is in an open state in which the needle 51B is separated from the valve port 21B. In this valve-opened state, the first radial projecting portion 411B of the transmission member 4B abuts on the lower end surface portion of the first annular portion 631B of the upper member 63B of the movable link 6B, and the transmission member 4B supports the movable link 6B in a suspended manner. An axial preset displacement t exists between the lower end surface of the first radial protrusion 411B and the stop portion 671B of the connecting body 62B₂. The lower end surface 521B of the lower engaging piece 52B of the needle member 5B abuts against the upper end surface of the first radial projection 642B of the lower member 64B of the movable link 6B, and the needle member 5B is suspended and supported by the movable link 6B.

From this valve-opened state, in the process that the driving member 3B of the electric valve drives the transmission member 4B to move in the valve-closing direction until the flow rate adjustment portion 512B of the needle 51B comes into contact with the valve port 21B to close the valve port 21B, that is, the first valve-closed state shown in fig. 12 is reached, the transmission member 4B, the movable connecting member 6B, the elastic element 7B, and the needle member 5B can be seen as a whole to move together in the axial direction in the valve-closing direction, and the relative positional relationship among the transmission member 4B, the movable connecting member 6B, the needle member 5B, and the elastic element 7B is the same as that in the valve-opened state shown in fig. 10, but moves downward together with respect to the valve body 2B.

In this process, on the one hand, there is no wear between the second guide outer wall 602B and the second guide inner wall 502B, since no axial relative movement occurs between the movable connecting member 6B and the needle member 5B. On the other hand, the movable connecting part 6B and the valve core sleeve 2B are axially and relatively moved, and then the movable connecting part and the valve core sleeve pass through the first guide inner wall 201B and the first guideA guiding fit is achieved towards the outer wall 601B. Although abrasion occurs between the first guide inner wall 201B and the first guide outer wall 601B during the guide engagement, the generated frictional force is generated only by the self-weight of the movable connecting member 6B, and the degree of abrasion is small. On the other hand, there is an axial preset displacement t between the lower end surface of the first radial protrusion 411B and the stop of the movable connecting part 6B₂The elastic element 7B is not compressed, a spring force for pressing the needle member 5B against the valve port 21B is not generated, the needle member 5B closes the valve port 21B by its own weight, the gap between the needle 51B and the valve port 21B is not affected by the spring force of the elastic element 7B, and even if the needle 51B rotates, the valve port 21B is only subjected to a frictional force caused by the weight of the needle member 5B and the movable connecting member 6B, which causes little wear on the contact surface between the needle 51B and the valve port 21B.

The operation procedures from the first valve-closed state shown in fig. 11 to the second valve-closed state shown in fig. 12 are as follows:

from the start of the valve-closed state shown in fig. 11, in which the valve needle 51B closes the valve port 21B, a pulse is applied in the valve-closing direction, and the transmission member 4B is further driven by the driving member 3B to move in the axial direction toward the valve-closing direction due to the preset displacement t between the first radial protrusion 411B and the stopper 671B₂The positional relationship among the movable connecting member 6B, the needle member 5B, and the valve port 21B is not changed. That is, the valve body sleeve 2B and the movable connection member 6B and the needle member 5B do not move relative to each other in the axial direction, and only the transmission shaft 41B moves downward in the axial direction and tends to move in the valve closing direction. When the transmission shaft 41B moves downward to the end point where the first radial protrusion 411B abuts against the stop portion 671B of the connection body 62B, the valve-closed state is two. That is, the transmission shaft 41B is moved toward the valve-closing direction in a self-closing state by a displacement amount smaller than or equal to the predetermined displacement amount t₂The process (2) is in a second valve-closed state. FIG. 12 shows that the transmission member 4B is displaced by an amount equal to the predetermined displacement t₂The state diagram is the moment when the first radial protrusion 411B of the transmission shaft 41B is just in contact with the stopping portion 671B of the connecting body 62B but no force is applied thereto.

In this process, on the one hand, no friction force acts between the first guide inner wall 201B and the first guide outer wall 601B, and between the second guide outer wall 602B and the second guide inner wall 502B; on the other hand, the elastic element 7B does not generate a spring force for pressing the needle member 5B toward the valve port 21B, that is, the contact surface between the needle 51B and the valve port 21B is not affected by the spring force of the elastic element 7B, and even if the needle 51B rotates in the entire second valve-closing state, the valve port 21B is subjected to only a friction force due to the weight of the needle member 5B and the movable connection member 6B, which causes little wear on the contact surface between the needle 51B and the valve port 21B.

The operation from the second valve-closed state shown in fig. 12 to the third valve-closed state shown in fig. 13 is as follows:

when a pulse is applied to the valve closing direction from the second valve closing state shown in fig. 12, the driving member 3B further drives the transmission shaft 41B to move in the axial direction toward the valve closing direction, and the first radial protrusion 411B of the transmission shaft 41B abuts against the stopper 671B of the connecting body 62B, so that the entire movable connecting member 6B is pressed by the transmission shaft 41B and moves downward during the downward movement of the transmission shaft 41B, the movable connecting member 6B moves axially relative to the valve body sleeve 2B, and the movable connecting member 6B moves axially relative to the valve needle member 5B, and friction forces are generated between the first guide inner wall 201B and the first guide outer wall 601B and between the second guide inner wall 601B and the second guide inner wall 502B, and these friction forces become resistance to the valve opening during the valve opening process. Therefore, the elastic element 7B is provided outside the movable connection member 6B, and one end thereof abuts against the movable connection member 6B and the other end thereof abuts against the needle member 5B. At the moment of opening the valve (i.e., during the movement from the second closed state to the first closed state), the spring force of the elastic element 7B can be used to overcome the frictional force, which contributes to opening the valve and improves the reliability of opening the valve.

Further, in this embodiment, the elastic element 7B is disposed below the first and second sets of guiding mechanisms, which is more favorable for overcoming the friction between the first guiding inner wall 201B and the first guiding outer wall 601B and the friction between the second guiding outer wall 602B and the second guiding inner wall 502B. In addition, in this process, the elastic element 7B is compressively deformed to generate a spring force that presses the needle 51B against the valve port 21B, and the spring force causes the needle 51B to more reliably seal the valve port 21B, tightly close the valve port 21B, and improves the valve closing reliability.

In this process, since the elastic element 7B is compressed, if the frictional force between the needle 51B and the transmission shaft 41B is greater than the frictional force between the needle 51B and the valve port 21B, the needle 51B rotates together with the transmission shaft 41B relative to the valve port 21B, and the portion of the valve port 21B in contact with the needle 51B is worn. If the friction between the valve needle 51B and the transmission member 4B is smaller than the friction between the valve needle 51B and the valve port 21B, the valve needle 51B does not rotate with the transmission member 4B, i.e., the contact portion of the valve port 21B with the valve needle 51B is not worn significantly. Therefore, in order to reduce the frictional force between the needle 51B and the transmission member 4B, the aforementioned washer 53B is provided.

The electric valve of the scheme is provided with the first guide inner wall 201B, the first guide outer wall 601B, the second guide inner wall 502B and the second guide outer wall 602B, the valve closing reliability of the valve is improved through the two groups of double-guide mechanisms, and the valve needle component acts stably. Further, as is clear from the operation process from the electric valve opening state to the valve closing state three described above, in the valve opening state three, since the movable connecting member 6B and the valve body sleeve 2B and the movable connecting member 6B and the valve needle member 5B are relatively moved in the axial direction, frictional forces are generated between the first guide inner wall 201B and the first guide outer wall 601B and between the second guide inner wall 502B and the second guide outer wall 602B, and these frictional forces become resistance to opening the valve in the valve opening process, and may cause a valve opening jam phenomenon. In order to reduce the valve opening resistance, the elastic element 7B is provided outside the movable connection member 6B, and one end thereof abuts against the movable connection member and the other end abuts against the needle member 5B. At the moment of opening the valve (i.e., during the movement from the second closed state to the first closed state), the spring force of the elastic element 7B can be used to overcome the frictional force, thereby facilitating the opening of the valve and improving the reliability of the opening of the valve. In addition, in the embodiment, the elastic element 7B is disposed below the first and second sets of guiding mechanisms, which is more favorable for overcoming the friction between the first guiding inner wall 201B and the first guiding outer wall 601B and between the second guiding inner wall 502B and the second guiding outer wall 602B. In addition, since the transmission member supports the movable connection member in a suspended manner, and the movable connection member supports the valve needle member in a suspended manner, the frictional force between the valve needle 51B and the valve port 21B is only a force caused by the weight of the valve needle member 5B and the movable connection member 6B at the moment when the valve needle 51B closes the valve port 21B, the moment when the valve needle 51B is separated from the valve port 21B, and the second valve closing state, and thus, even if the electric valve is repeatedly operated, the abrasion between the contact portions of the valve needle 51B and the valve port 21B is extremely small, thereby reducing the internal leakage in the fully closed state of the electric valve. In the same manner as when the needle 51B is separated from the valve port 21B during the valve opening process, at the moment when the needle 51B is separated from the valve port 21B, the frictional force between the needle 51B and the valve port 21B is caused only by the self weight of the needle member 5B and the movable connection member 6B, and even if the valve is repeatedly operated, the amount of wear at the contact portion between the needle 51B and the valve port 21B is extremely small, thereby further improving the sealing reliability of the valve.

Before the valve is closed, the spring force of the elastic element 7B is not applied between the needle member 5B and the transmission member 4B, the needle member 5B and the movable connection member 6B do not rotate together with the transmission member 4B, and there is almost no friction between the valve core sleeve 2B and the movable connection member 6B and between the movable connection member 6B and the needle member 5B, so that the valve opening resistance can be further reduced, and the valve opening reliability can be improved.

It should be noted that, in this embodiment, in order to improve the wear resistance between the first guiding inner wall 201B and the first guiding outer wall 601B and between the second guiding outer wall 602B and the second guiding inner wall 502B, the valve core sleeve 2B and the connecting body 62B may be respectively processed by two different materials, for example, one is processed by using a brass material, and the other is processed by using a stainless steel material. Similarly, the lower member 64B and the lower engaging member 52B can be made of two different materials, one of which is made of brass and the other of which is made of stainless steel. Alternatively, the first guide inner wall 201B and the first guide outer wall 601B and the second guide outer wall 602B and the second guide inner wall 502B may be plated.

The following describes a method for manufacturing an electric valve according to this embodiment, which includes the steps of:

a1, preparing an upper valve body 12B, a lower valve body 13B and a valve core sleeve 2B of a valve body part 1B, preparing a rotor 31B, preparing a transmission part 4B, preparing a valve needle part 5B, preparing a movable connecting part 6B and preparing a nut part 8B;

a2 is a first assembly in which an elastic element 7B, a transmission member 4B, a movable connection member 6B, and a needle member 5B are assembled, the transmission member 4B and the movable connection member 6B are suspended and connected, the movable connection member 6B and the needle member 5B are suspended and connected, one end of the elastic element 7B is brought into contact with the movable connection member 6B, the other end is brought into contact with the needle member 5B, and the movable connection member 6B and the needle member 5B are slidably fitted to each other through a gap between a second guide inner wall 502B and a second guide outer wall 602B. Step a2 further includes:

a21, sleeving the lower engaging piece 52B on the outer edge of the lower member 64B, allowing the second guiding inner wall 502B of the inner wall of the lower engaging piece 52B to be in clearance sliding fit with the second guiding outer wall 602B of the outer wall of the lower member 64B, extending the lower end of the lower engaging piece 52B into the open cavity of the valve needle 51B and press-fitting and fixing with the valve needle 51B, so that the lower member 64B supports the valve needle component 5B in a hanging manner, wherein, in order to ensure the fitting strength, the lower engaging piece can be further welded and fixed; after the washer 53B and the elastic member 7B are fitted around the outer peripheral portion of the lower engaging piece 52B, the upper end of the lower member 64B is inserted into the lower insertion hole 68B of the connecting body 62B and press-fitted and fixed to the connecting body 62B, completing the assembly of the first sub-assembly. In this way, in the first sub-assembly, one end of the elastic element 7B abuts against the lower member 64B, the other end thereof directly abuts against the washer 53B and indirectly abuts against the needle 51B, and the lower member 64B is in guiding engagement with the lower engaging piece 52B. In this step, the assembling order of the parts is not limited as long as the first sub-assembly can be assembled. The upper member 63B is provided on the outer edge of the transmission shaft 41B.

A22 fixedly connects the upper member 63B and the connecting body 62B as a first unit, and has the first radial projecting portion of the transmission shaft 41B suspendedly supporting the first suspending portion of the movable connecting member 6B and the second radial projecting portion of the movable connecting member 6B suspendedly supporting the second suspending portion of the lower engaging piece 52B. That is, the transmission member 4B supports the movable connection member 6B in a suspended manner, the movable connection member 6B supports the needle member 5B in a suspended manner, and one end of the elastic element 7B abuts against the lower member 64B and the other end abuts against the needle 51B.

A3 is used for fixing the lower valve body 13B and the valve core sleeve 2B as a second component by furnace welding. Of course, it is understood that other welding methods may be used to join the parts during this step. In this step, the lower valve body 13B, the valve core sleeve 2B, the first connecting pipe and the second connecting pipe may be welded and fixed to serve as a second component, so as to save the processing cost, that is, the valve core sleeve 2B is placed in the lower valve body 13B, the lower end of the valve core sleeve extends out of the lower valve body 13B, the second connecting pipe is welded to the periphery of the lower end of the valve core sleeve 2B, and the first connecting pipe is welded to the lower valve body 13B.

A4 assembling a first assembly with a second assembly: the valve needle component 5B of the first component extends into the valve core sleeve 2B from the lower end to be assembled with the valve core sleeve 2B: the first guide inner wall 201B of the inner wall of the valve core sleeve 2B is in clearance sliding fit with the first guide outer wall 601B of the outer wall of the connecting body 62B;

a5 is configured to fit the nut member 8B around the outer edge of the transmission shaft 41B, and specifically, to connect the nut 81B with the transmission shaft 41B by screw thread, to weld and fix the nut 81B with the lower valve body 13B, and to weld and fix the rotor 31B with the transmission shaft 41B.

A6 welds and fixes the upper valve body 12B and the lower valve body 13B, completing the assembly of the electric valve of the present embodiment.

It should be noted that the transmission member 4B may also adopt a split structure as shown in the first embodiment, and the description is not repeated here.

It will be understood by those skilled in the art that the movable connecting part 6B in the present embodiment is completely disposed in the spool case 2B, i.e., it is also possible that the spool case 2B is not exposed. It is understood that the lower end portion of the needle member 5B may also extend out of the valve core housing 2A as long as the object of the present application is achieved.

It should be noted that, in each of the above embodiments, the valve port of the electric valve is disposed on the valve core sleeve, specifically, the valve core sleeve is a cylindrical structure having a core cavity, the valve core sleeve is fixedly connected with the valve body component, and a flow port 22A/22B communicating the inner cavity of the valve core sleeve with the outer space of the valve core sleeve is further disposed on the peripheral wall of the valve core sleeve, so that the fluid inlet and the fluid outlet of the electric valve can be communicated through the valve port and the flow port when the valve port is in an open state. In the above embodiments, the elastic element 7A and the elastic element 7B are specifically compression springs.

In addition, the upper end of the valve core sleeve and the nut component can also be fixed to improve the coaxiality between the nut component and the valve core sleeve, so that the coaxiality between the transmission component and the valve core sleeve is controlled.

Of course, in actual installation, the valve port can also be directly arranged on the lower valve body or additionally arranged with parts and provided with the valve port, and the valve body part is internally provided with a separate valve core sleeve for guiding each movable connecting part and the valve needle part. Similarly, the valve core sleeve in each embodiment may also be fixed on other parts without being directly fixed with the valve body part, and then the other parts are fixedly connected with the valve body part.

On the premise of realizing the purpose of the application, the valve needle part and the movable connecting part can be arranged in the valve core sleeve, or can be respectively and partially arranged in the valve core sleeve, or one of the valve needle part and the movable connecting part is arranged in the valve core sleeve, and the other one is not arranged in the valve core sleeve.

In order to understand the technical solution of the present application, it should be understood that the above-mentioned numbers of the steps are only used to clearly illustrate the assembling steps of the electric valve, and the size relationship of the numbers does not represent the inevitable sequential relationship among the steps, so long as the assembling of the electric valve can be realized, the sequential relationship among the steps can be flexibly adjusted as required.

The above provides a detailed description of an electrically operated valve and a method for manufacturing the same. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims

1. An electrically operated valve comprising:

the valve body component comprises a valve core sleeve, and the valve core sleeve comprises a first guide inner wall; the valve body component also comprises a valve body, and the valve core sleeve and the valve body are of a split structure or an integrated structure;

a drive member including an electromagnetic coil and a rotor;

the movable connecting part is connected with the transmission part in a hanging mode, can be driven by the transmission part to move axially relative to the valve core sleeve, and comprises a connecting body, the connecting body comprises a first guide outer wall, the first guide outer wall is in clearance sliding fit with the first guide inner wall, the connecting body comprises a lower opening and a containing hole communicated with the lower opening, and the hole wall of the containing hole comprises a second guide inner wall;

2. Electrically operated valve according to claim 1, characterized in that:

the transmission component comprises a first radial bulge, the movable connecting component comprises a first suspension part and a second radial bulge, and the valve needle component comprises a second suspension part; the first radial projecting portion is capable of abutting against or separating from the first hanging portion, and the second radial projecting portion is capable of abutting against or separating from the second hanging portion; the connecting body comprises a stopping part arranged below the first radial protruding part, when the transmission component tends to move towards the valve closing direction until the first radial protruding part abuts against the stopping part, the transmission component can push the movable connecting component to move towards the valve closing direction, and the elastic element pushes the valve needle towards the valve port.

3. Electrically operated valve according to claim 2, characterized in that:

the connecting body further comprises an upper opening part, and the movable connecting part further comprises an upper component arranged at the upper opening part and a lower component arranged at the lower opening part; the upper member includes a first annular portion having a through hole, the first annular portion serving as the first hanging portion; the lower member includes a base member having a through hole, the base member being disposed at an outer edge of the valve needle, an inner wall of the base member including a second annular portion as the second radial projecting portion, the transmission component further including an upper engaging piece disposed at a lower end portion of the transmission shaft, the upper engaging piece including a large-diameter ring portion between the upper member and the stopper portion, the large-diameter ring portion serving as the first radial projecting portion; the inner wall of the connecting body comprises a first annular convex part which is arranged opposite to the first radial convex part, and the first annular convex part is used as the stopping part.

4. Electrically operated valve according to claim 2, characterized in that:

the valve needle component further comprises a lower clamping piece, the valve needle comprises a main body part, a flow regulating part and a guide part, the flow regulating part is located below the main body part, the guide part is located above the main body part, the guide part is arranged in the accommodating hole, and the second guide outer wall is arranged on the outer wall of the guide part; the lower clamping piece is arranged on the outer edge of the main body part; the lower end surface part of the lower clamping piece is used as the second hanging part; one end of the elastic element is abutted against the movable connecting part, and the other end of the elastic element is abutted against the main body part.

5. An electrically operated valve according to claim 3, characterised in that:

the inner wall of the valve core sleeve comprises a first small diameter part and a first diameter expanding part arranged above the first small diameter part, and the first guide inner wall is arranged on the first small diameter part; the upper opening part of the connecting body is fixedly welded with the upper component, and/or the outer wall of the connecting body comprises a first large-diameter part and a first reducing part arranged above the first large-diameter part, the first guide outer wall is arranged on the first large-diameter part, and the first reducing part is fixedly welded with the upper component.

6. An electrically operated valve according to claim 3, characterised in that:

the inner wall of the valve core sleeve comprises a first small diameter part and a second diameter expanding part arranged below the first small diameter part, and the first guide inner wall is arranged on the first small diameter part; the lower opening part of the connecting body is fixedly welded with the lower component, and/or the outer wall of the connecting body comprises a first large-diameter part and a second reduced-diameter part arranged below the first large-diameter part, the first guide outer wall is arranged on the first large-diameter part, and the second reduced-diameter part is fixedly welded with the lower component.

7. A method of manufacturing an electrically operated valve as claimed in claim 1, comprising the steps of:

a3 fixedly connecting the lower valve body with the valve core sleeve;

8. The method of manufacturing an electrically operated valve according to claim 7, wherein:

the step A2 and the step A3 are interchanged in order.