CN113446405A

CN113446405A - Electronic expansion valve

Info

Publication number: CN113446405A
Application number: CN202010230366.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-09-28

Abstract

The electronic expansion valve provided by the invention comprises a valve needle and a magnetic assembly by optimally designing the structure of the electronic expansion valve, wherein the magnetic assembly comprises a first magnetic part and a second magnetic part, the first magnetic part is fixedly connected or in limited connection with a guide seat, the second magnetic part is fixedly connected or in limited connection with the valve needle, and the valve needle has the tendency of moving towards the direction away from a valve opening part all the time due to the magnetic repulsion generated by the magnetic assembly, so that the actuation reliability of the electronic expansion valve can be relatively guaranteed.

Description

Electronic expansion valve

Technical Field

The invention relates to the technical field of refrigeration control, in particular to an electronic expansion valve.

Background

The speed reducing electronic expansion valve for frequency converting air conditioner consists of two parts, one part is valve body for flow regulation and the other part is coil for driving, and includes opening control mechanism, elastic element, transmission mechanism, speed reducing mechanism, driving part, etc. the action principle is that after the coil is powered on, electromagnetic force is produced to drive the rotor to rotate, and after the rotor is decelerated by the speed reducer, the transmission mechanism converts the rotation into linear motion and transmits the linear motion to the opening control mechanism to make the valve needle lift axially to approach or leave the valve port to control the opening of the valve.

Disclosure of Invention

The main object of the present invention is to provide a new electronic expansion valve structure, which can keep the valve needle moving towards the valve opening direction all the time.

In order to achieve the above object, an electronic expansion valve is provided, which is characterized by comprising a valve body, a valve port part and a guide seat, the valve body is fixedly connected with the valve port part or is an integral structure, the guide seat is fixedly connected with the valve body, the guide seat is provided with a guide hole, the electronic expansion valve further comprises a valve needle and a magnetic component, the guide hole is matched with the valve needle, and the valve needle can approach or be far away from the valve port part, the magnetic component comprises a first magnetic part and a second magnetic part, the first magnetic part is fixedly connected or in limited connection with the guide seat, the second magnetic part is fixedly connected or in limited connection with the valve needle, the first magnetic part and the second magnetic part are arranged oppositely, and the end faces of the first magnetic part and the second magnetic part which are arranged oppositely have the same magnetic poles.

The electronic expansion valve provided by the invention comprises a valve needle and a magnetic assembly by optimally designing the structure of the electronic expansion valve, wherein the magnetic assembly comprises a first magnetic part and a second magnetic part, the first magnetic part is fixedly connected or in limited connection with a guide seat, the second magnetic part is fixedly connected or in limited connection with the valve needle, the first magnetic part and the second magnetic part are oppositely arranged, the end faces of the first magnetic part and the second magnetic part which are oppositely arranged have the same magnetic poles, and the valve needle has the tendency of moving towards the direction far away from the valve opening part all the time due to the magnetic repulsion force generated by the magnetic assembly.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is an overall sectional view of an electronic expansion valve provided in the present invention;

FIG. 2 is an enlarged view of a valve body of a first embodiment of an electronic expansion valve according to the present invention;

FIG. 3 is a schematic perspective view of a magnetic assembly of the electronic expansion valve provided in the present invention;

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 and fig. 2, the electronic expansion valve according to the first embodiment of the present invention is described in detail, the electronic expansion valve includes a valve body 1 and a valve port 2, the valve port 2 is provided with a valve port 21, the valve body 1 and the valve port 2 are fixedly connected or both can be an integrated structure, when the valve body 1 is an integrated structure, the valve port can be directly disposed on the valve body 1, the sidewall of the valve body is provided with a first connection port, the valve port 2 is provided with a second connection port, the electronic expansion valve further includes a first connection pipe 10 and a second connection pipe 20, wherein the first connection pipe 10 is fixedly connected to the first connection port, the second connection pipe 20 is fixedly connected to the second connection port, the electronic expansion valve has a valve cavity a, refrigerant can enter the valve cavity a from the first connection pipe 10 and flow out of the second connection pipe 20 through the valve port, or refrigerant can enter the valve cavity a from the second connection pipe 20 and flow out of the first connection pipe 10 through the valve port, and further includes a guide seat 3, The valve needle 4 and the transmission component 6, the guide seat 3 is fixedly connected with the valve body 1, the guide seat 3 has a guide hole 31, the guide hole 31 is matched with the valve needle 4, the valve needle 4 extends into the valve cavity a through the guide hole 31, the transmission component 6 comprises a nut 61 and a screw rod 62, the valve needle 4 can move downwards through the screw-thread matching action of the nut 61 and the screw rod 62 to be close to the valve port to adjust the flow rate of a refrigerant flowing through the valve port, the electronic expansion valve further comprises a magnetic component 5, the magnetic component 5 comprises a first magnetic part 51 and a second magnetic part 52, the first magnetic part 51 is embedded with the guide seat 3 or can be directly positioned on the end surface of the guide seat 3 to be abutted against the first magnetic part or can be adhered to the guide seat 3 or can be press-fitted into the guide seat 3 in a slight interference manner, and the second magnetic part 52 can be adhered to the valve needle 4 or can be press-fitted into the valve needle 4 or the second magnetic part in a slight interference manner The valve needle 4 is inserted, so that the fixed connection or the limited connection between the first magnetic part and the guide seat and the fixed connection or the limited connection between the second magnetic part and the valve needle are realized, the first magnetic part 51 and the second magnetic part 52 are oppositely arranged, the end surfaces of the first magnetic part 51 and the second magnetic part 52 which are oppositely arranged have the same magnetic poles, the electronic expansion valve has an open valve state and a closed valve state, and when the valve is required to be closed, the screw rod 62 presses the valve needle 4 to move downwards through the thread matching effect of the nut 61 and the screw rod 62, so that the magnetic repulsion force generated by the magnetic component 5 is overcome until the valve needle 4 is abutted against the valve port 21; when the valve needs to be opened, the valve needle is no longer pressed by the screw rod 62, the valve needle 4 moves in the direction away from the valve port by the magnetic repulsion force, and the valve needle 4 relatively moves away from the valve port 21, so that no matter in the valve opening state or the valve closing state, the valve needle 4 can always move in the direction away from the valve port by the magnetic repulsion force generated by the magnetic component 5, and particularly, when the electronic expansion valve is actuated from the valve closing state to the valve opening state, the valve needle 4 can be actuated in the direction away from the valve port by the magnetic repulsion force generated by the magnetic component 5, so that the valve opening operation can be smoothly performed. Above-mentioned structure has add magnetic component 5 through the optimal design to the electronic expansion valve structure, replace traditional compression spring, just can offset the pressure differential power that the needle received through producing magnetic repulsion, the repulsion that the needle received is relatively even can reduce the needle and lead to the condition of needle skew because of fatigue deformation because of traditional spring part relatively, the magnetic repulsion who compares in spring magnetic component's production can not be like the spring and attenuate along with the valve action, promptly at the same operating position, the magnetic repulsion that the needle received can keep unchangeable relatively, compare in the spring have a long life.

Further, the guide holder 3 includes a body section 32 and a tapered section 33, the tapered section 33 is formed with a guide hole 31, the body section 32 includes a first body section 321 and a second body section 322, the inner diameter of the first body section 321 is larger than the inner diameter of the second body section 322, the inner diameter of the second body section 322 is larger than the inner diameter of the tapered section 33, that is, the diameter of the guide hole 31, a step surface 322a is formed between the first body section 321 and the second body section 322, the electronic expansion valve further includes an accommodating cavity B, the nut 61 is press-fitted into the accommodating cavity B, the upper end of the first body section 321 has a deforming part 3211, the deforming part 3211 limits the nut 61 in the accommodating cavity B by rivet pressing deformation, the nut 61 abuts against the step surface 322a, the nut 61 is integrally fixed to the guide holder 3 in a limiting manner, the needle 4 has a body and a flange 41, the flange 41 can perform axial lifting motion along the inner wall of the second body section 322, the tapered section 33 includes an end surface 331, the end surface 331 is provided with a first groove 3311, the first magnetic part 51 is engaged with the first groove 3311 or the first magnetic part 51 is press-fitted into the first groove 3311 by a slight interference, specifically, the first magnetic part 51 may be an annular permanent magnet component which is interference-fitted or close-clearance-fitted with a groove wall of the first groove 3311, the lower end of the flange 41 is provided with a second groove 411, the second magnetic part 52 is engaged with the second groove 411, specifically, the second magnetic part 52 may be an annular permanent magnet component which is interference-fitted or close-clearance-fitted with a groove wall of the second groove 411, in order to generate a good magnetic repulsion force, the height of the first magnetic part 51 is greater than the depth of the first groove 3311, the height of the second magnetic part 52 is greater than the depth of the second groove 411, the first magnetic part and the second magnetic part are both permanent magnets, and the magnetic properties of the magnetic component 5 made of natural magnets can be almost permanently preserved, compared with the conventional compression spring, the service life of the compression spring is longer, further, the first magnetic part 51 comprises a first end surface 511 and a second end surface 512, the second magnetic part 52 comprises a third end surface 521 and a fourth end surface 522, the first end surface 511 and the third end surface 521 are arranged in opposite directions, the first end surface 511 and the third end surface 521 are both of the same magnetic pole such as an S pole, the second end surface 512 and the fourth end surface 522 are of the same magnetic pole, and according to the characteristic that the same poles of the magnet repel each other, the first magnetic part and the second magnetic part generate magnetic repulsion force, so that the valve needle tends to move in the direction away from the valve port, and in order to ensure better magnetic repulsion force, the central axis of the first magnetic part 51 is collinear with the central axis of the second magnetic part 52.

The second embodiment of the electronic expansion valve provided by the present invention is briefly described below, and is different from the first embodiment in that the fitting manner of the magnetic assembly 5 is changed, in this embodiment, the upper portion of the tapered section 33 has a ring-shaped first end surface protrusion, the first magnetic portion 51 is externally sleeved on the outer peripheral portion of the first end surface protrusion, so that the first magnetic portion 51 is approximately positioned on the guide seat 3, the first lower protruding portion is provided below the flange 41, the second magnetic portion 52 is externally sleeved on the outer peripheral portion of the first lower protruding portion, in order to generate a good magnetic repulsion, the height of the first magnetic portion 52 is greater than the height of the first end surface protrusion, the height of the second magnetic portion 52 is greater than the height of the first lower protruding portion, and the related technical effects are specifically stated in the first embodiment and will not be described herein.

A third embodiment of the electronic expansion valve according to the present invention is briefly described below, in which the engaging manner of the magnetic assembly 5 is changed, the upper portion of the tapered section 33 has a second end surface protrusion, the first magnetic portion 51 is sleeved on the second end surface protrusion, the lower portion of the flange 41 has a second lower protrusion, the second magnetic portion 52 is sleeved on the second lower protrusion, in order to generate a better magnetic repulsion force, the height of the first magnetic portion is greater than that of the second end surface protrusion, and the height of the second magnetic portion is greater than that of the second lower protrusion.

Referring to fig. 1 for briefly describing other components and operation principles of the electronic expansion valve, the electronic expansion valve further includes a housing 7, a driving member 8 and a planetary reduction gear device 9, the housing 7 is fixedly connected to the valve body 1 to substantially define a valve cavity a of the electronic expansion valve, the driving member 8 includes a coil sleeved on an outer periphery of the housing 7 and a rotor assembly 8 disposed in the valve cavity a, a top frame mechanism 100 is further disposed above the rotor assembly 8, the rotor assembly 8 includes a rotor 81 and a connecting seat 82, which are integrally formed by injection molding, the planetary reduction gear device 9 includes a sun gear 91, a planetary gear 92, a planet carrier 93 and a fixed gear 94, the electronic expansion valve further includes a sleeve 200, the fixed gear 94 and the sleeve 200 are integrally formed by injection molding, the sun gear 91 and the connecting seat 82 are integrally formed, the planet carrier 93 is provided with a plurality of mounting shafts, and the planetary gear 92 is sleeved on the mounting shafts, the driving component 8 is used as the input end of the planetary gear speed reducing mechanism, the rotor rotates to drive the sun gear 91 to rotate under the excitation action of the coil of the driving component, thereby driving the planet gear to rotate along the axis of the planet gear, and through the meshing action of the planet gear 92 and the fixed gear 94, so that the planet gears 92 revolve along the axis of the sleeve 200, eventually driving the carrier 93 to rotate about its own axis, the carrier 93 also having an output shaft 931 integrally formed with the carrier 93, therefore, the output shaft 931 can self-transmit along the axis of the output shaft 931, the output shaft 931 is matched with the transmission mechanism 6, the output shaft 931 is integrally injected on the screw rod 62 in the electronic expansion valve structure provided by the invention, the screw 62 is rotated synchronously with the rotation of the output shaft 931 to adjust the flow rate of the refrigerant flowing through the valve port by relatively moving the needle 4 toward or away from the valve port 21 in cooperation with the threads of the nut 61.

It should be noted that the electronic expansion valve provided by the present invention focuses on that the magnetic assembly is added to change the structure of the guide seat and the valve needle to replace the conventional compression spring, and other alternatives are possible for other components such as the driving component, the transmission component, and the like.

Magnetic component 5 has been add through the optimal design to the electronic expansion valve structure, replace traditional compression spring, just can offset the pressure differential power that the needle received through producing magnetic repulsion, the repulsion that the needle received is relatively even can reduce the needle consequently and lead to the condition of needle skew relatively, the magnetic repulsion who compares in spring magnetic component's production can not be like the spring and attenuate along with the valve action, promptly at the same operating position, the magnetic repulsion that the needle received can keep unchangeable relatively, compare in the spring have a long service life.

It should be further understood that the terms "first," "second," etc. are used herein to describe various elements, components, regions, layers, etc. which are included in the specification, should not be construed as limiting the invention in any way, but rather should be construed according to the claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve is characterized by comprising a valve body, a valve port and a guide seat, wherein the valve body and the valve port are fixedly connected or are in an integrated structure, the guide seat is fixedly connected with the valve body, the guide seat is provided with a guide hole, the electronic expansion valve further comprises a valve needle and a magnetic assembly, the guide hole is matched with the valve needle, the valve needle can be close to or far away from the valve port, the magnetic assembly comprises a first magnetic part and a second magnetic part, the first magnetic part is fixedly connected or in limited connection with the guide seat, the second magnetic part is fixedly connected or in limited connection with the valve needle, the first magnetic part and the second magnetic part are oppositely arranged, and the end faces of the first magnetic part and the second magnetic part, which are oppositely arranged, have the same magnetic poles.

2. The electronic expansion valve according to claim 1, wherein the guide seat comprises a body section and a tapered section, the tapered section comprising an end surface provided with a first groove into which the first magnetic part is fitted, the valve needle having a flange part provided with a second groove into which the second magnetic part is fitted.

3. The electronic expansion valve of claim 2, wherein the height of the first magnetic part is greater than the depth of the first groove, and the height of the second magnetic part is greater than the depth of the second groove.

4. The electronic expansion valve of claim 1, wherein the guide seat comprises a body section and a conical section, the conical section comprises an end surface, the upper portion of the conical section has a first end surface protrusion, the first magnetic part is sleeved on the outer periphery of the end surface protrusion, the valve needle has a flange portion, the flange portion has a first lower protruding portion below, and the second magnetic part is sleeved on the lower protruding portion.

5. The electronic expansion valve according to claim 4, wherein the first magnetic portion has a height greater than a height of the first end surface projection, and the second magnetic portion has a height greater than a height of the first lower projection.

6. The electronic expansion valve according to claim 1, wherein the guide seat comprises a body section and a tapered section, the tapered section comprises an end surface, an upper portion of the tapered section has a second end surface protrusion, the first magnetic part is fitted over the second end surface protrusion, the valve needle has a flange portion, a lower portion of the flange portion has a second lower protrusion, and the second magnetic part is fitted over the second lower protrusion.

7. The electronic expansion valve according to claim 1, wherein the first magnetic portion is protruded higher than the second end surface, and the second magnetic portion is protruded higher than the second lower protrusion.

8. An electronic expansion valve according to any one of claims 2-7, wherein the body section comprises a first body section and a second body section, a step surface is formed between the first body section and the second body section, the valve needle has a flange portion capable of performing an axial elevating movement along an inner wall of the second body section, and the electronic expansion valve further comprises a transmission member comprising a nut and a screw rod, and the valve needle is pushed to move downward to approach the valve port portion by a screw-thread cooperation of the nut and the screw rod.

9. The electronic expansion valve according to claim 8, wherein the electronic expansion valve comprises a receiving chamber, the nut is press-fitted into the receiving chamber, the first body section has a deformation portion, the deformation portion fixes the nut to the receiving chamber by riveting deformation, and the nut abuts against the step surface.

10. The electronic expansion valve according to any of claims 1-9, wherein the first magnetic part comprises a first end face and a second end face, the second magnetic part comprises a third end face and a fourth end face, the first end face and the third end face are disposed opposite to each other and have the same magnetic poles, the second end face and the fourth end face have the same magnetic poles, the central axis of the first magnetic part is collinear with the central axis of the second magnetic part, and the first magnetic part and the second magnetic part are permanent magnet rings.