CN210372219U

CN210372219U - Electronic expansion valve

Info

Publication number: CN210372219U
Application number: CN201920890385.1U
Authority: CN
Inventors: 曾庆军; 陈勇好
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-04-21
Anticipated expiration: 2029-06-13

Abstract

The utility model provides an electronic expansion valve, which comprises a valve needle component and a rotor component; the utility model discloses a set up the needle subassembly, including the nut, the needle subassembly includes needle and setting element, the rotor subassembly includes the nut, the needle is worn to locate the nut, the setting element cover is established and is fixed in the needle, the setting element is arranged in the top of nut, its characterized in that, the setting element orientation the one end of nut extends and forms annular guide part, the guide part encloses to be established the nut and with nut line contact. The utility model discloses an electronic expansion valve through guide part and nut line contact, supports when the nut supports and leans on the guide part to drive the needle and remove, prevents that the needle from deflecting, guarantees the accurate throttle of electronic expansion valve, after long-term the use, avoids the serious condition of the unilateral wearing and tearing of needle, guarantees that electronic expansion valve normally works.

Description

Electronic expansion valve

Technical Field

The utility model relates to a valve control technical field, concretely relates to electronic expansion valve.

Background

An electronic expansion valve is a throttling element that can regulate the flow according to a preset program, and plays an important role in a refrigeration system. The existing electronic expansion valve comprises a valve needle, a positioning piece and a nut, wherein the positioning piece is fixed on the valve needle by welding, and the nut is in surface-to-surface contact with the positioning piece to drive the valve needle to move to adjust the flow; due to the stress influence during welding, the positioning piece is easy to tilt and is not coaxial with the valve needle, and when the nut abuts against the positioning piece to drive the valve needle to adjust the flow, the valve needle deflects, so that the flow of the electronic expansion valve is inaccurately adjusted. In the past, the valve needle is seriously abraded on one side, and the electronic expansion valve cannot realize throttling, so that the consequence is serious.

SUMMERY OF THE UTILITY MODEL

The utility model provides an above-mentioned problem, provides an electronic expansion valve, when aiming at the needle removal regulation flow, guarantees the straightness that hangs down of needle, prevents the needle incline, ensures that the throttle function is not destroyed.

The utility model provides an electronic expansion valve, which comprises a valve needle component and a rotor component; the utility model discloses a set up the needle subassembly, including the nut, the needle subassembly includes needle and setting element, the rotor subassembly includes the nut, the needle is worn to locate the nut, the setting element cover is established and is fixed in the needle, the setting element is arranged in the top of nut, its characterized in that, the setting element orientation the one end of nut extends and forms annular guide part, the guide part encloses to be established the nut and with nut line contact.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

In one embodiment, an end surface of the guiding portion contacting the nut is a guiding surface, the guiding surface is disposed obliquely to an axis of the valve needle, and the guiding surface is a plane.

In one embodiment, the angle of inclination of the guide surface with respect to the axial direction of the valve needle is 30 ° to 60 °.

In one embodiment, an end surface of the guiding portion contacting the nut is a guiding surface, and the guiding surface is an arc surface.

In one embodiment, a rounded section is provided between the end and the side of the nut, and the nut is in line contact with the guide part through the rounded section.

In one embodiment, the rotor assembly further includes a rotor, and the rotor is connected to the nut and can drive the nut to rotate.

In one embodiment, the rotor assembly further includes a first stopper, and the first stopper is clamped to fix the nut and the rotor.

In one embodiment, the valve needle assembly further comprises a guide sleeve, the valve needle passes through the guide sleeve, the nut is sleeved on the guide sleeve, and the nut is threaded on the guide sleeve and can move relative to the guide sleeve.

In one embodiment, a second limiting member is disposed on the guide sleeve, and the second limiting member is disposed at the bottom of the nut and limits the axial movement of the nut.

In one embodiment, the electronic expansion valve further comprises a valve body assembly, the valve body assembly comprises a valve body, a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe are communicated with the valve body.

The utility model discloses an electronic expansion valve, setting element have the guide part, are line contact between guide part and the nut, and when the nut supported and held the guide part and drive the needle and remove the regulation flow, the needle can not take place the incline, prevents the needle wearing and tearing, is favorable to the accurate throttle of electronic expansion valve, after long-term the use, guarantees equally that electronic expansion valve's throttle function is not destroyed, ensures that electronic expansion valve normally works.

Drawings

Fig. 1 is a schematic structural diagram of an electronic expansion valve according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the electronic expansion valve of FIG. 1 at A;

fig. 3 is a close-up view of an electronic expansion valve at a in another embodiment.

Description of reference numerals:

100. an electronic expansion valve; 10. a valve body assembly; 11. a liquid inlet pipe; 12. a liquid outlet pipe; 13. a valve body; 131. a liquid inlet; 132. a valve port; 20. a rotor assembly; 21. a nut; 211. a connecting portion; 212. an abutting portion; 22. a rotor; 23. a first limit piece; 30. a valve needle assembly; 31. a guide sleeve; 311. a second limiting member; 32. a valve needle; 33. a positioning member; 331. a guide portion; 332. a guide surface; 34. a first elastic member; 35. a second elastic member.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "head", "end" and "bottom" and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic expansion valve 100 according to an embodiment of the present invention. The utility model provides an electronic expansion valve 100, electronic expansion valve 100 are used for adjusting fluid medium's flow and pressure.

In the present embodiment, the electronic expansion valve 100 is applied to an air conditioning system, and the fluid medium flowing through the electronic expansion valve 100 is a refrigerant for performing heat and cold exchange in the air conditioning system. At this time, the electronic expansion valve 100 is installed at an inlet of an evaporator of the air conditioning system, and the electronic expansion valve 100 serves as a boundary element between a high-pressure side and a low-pressure side of the air conditioning system, and throttles and reduces the pressure of the high-pressure liquid refrigerant, so that the dosage of the liquid refrigerant entering the evaporator is adjusted and controlled, and the dosage of the liquid refrigerant can meet the requirement of an external refrigeration load.

It is understood that in other embodiments, the electronic expansion valve 100 may be applied to other types of refrigeration equipment besides an air conditioning system, and the flow passing through the electronic expansion valve 100 may be other fluid media besides refrigerant, as long as the electronic expansion valve 100 can achieve throttling and pressure reduction of the fluid media.

The electronic expansion valve 100 includes a valve body assembly 10, a rotor assembly 20, and a valve needle assembly 30, wherein the valve body assembly 10, the rotor assembly 20, and the valve needle assembly 30 are connected to each other. The valve body assembly 10 is used for enabling the refrigerant to flow into or out of the electronic expansion valve 100; the rotor assembly 20 is used for driving the valve needle assembly to move; the valve needle assembly 30 is used for controlling the opening or closing of the electronic expansion valve 100, so as to implement the throttling function of the electronic expansion valve 100.

The valve assembly 10 includes a liquid inlet pipe 11, a liquid outlet pipe 12 and a valve body 13, the liquid inlet pipe 11 and the liquid outlet pipe 12 are both connected to the valve body 13, the liquid inlet pipe 11 serves as a liquid inlet channel for the refrigerant to flow into the electronic expansion valve 100, the liquid outlet pipe 12 serves as a liquid outlet channel for the refrigerant to flow out of the electronic expansion valve 100, and the valve body 13 is used for fixing other components of the electronic expansion valve 100.

In this embodiment, the liquid inlet pipe 11 is arc-shaped, the liquid outlet pipe 12 is linear, the valve body 13 is provided with a liquid inlet 131 and a valve port 132, the liquid inlet pipe 11 is fixed and communicated with the valve body 13 corresponding to the liquid inlet 131, and the liquid outlet pipe 12 is fixed and communicated with the valve body 13 corresponding to the valve port 132. Therefore, the refrigerant can flow into the electronic expansion valve 100 through the liquid inlet pipe 11, or flow out of the electronic expansion valve 100 through the liquid outlet pipe 12, thereby ensuring the normal use of the electronic expansion valve 100.

It is understood that in other embodiments, the liquid inlet pipe 11 and the liquid outlet pipe 12 may have other shapes as long as the flow of the refrigerant into and out of the electronic expansion valve 100 can be achieved.

In the embodiment, the liquid inlet pipe 11, the liquid outlet pipe 12 and the valve body 13 are fixed by welding, so that the liquid inlet pipe 11, the liquid outlet pipe 12 and the valve body 13 are ensured to have good sealing performance; it can be understood that, in other embodiments, the liquid inlet pipe 11 and the liquid outlet pipe 12 may be fixed to the valve body 13 by other connection methods such as adhesive connection, as long as the liquid inlet pipe 11, the liquid outlet pipe 12, and the valve body 13 can normally realize refrigerant circulation.

The rotor assembly 20 includes a nut 21, a rotor 22 and a first limiting member 23, the nut 21 is connected to the rotor 22, the first limiting member 23 is connected to the nut 21 and the rotor 22 at the same time, the nut 21 is used to drive the valve needle assembly 30 to move so as to adjust the flow rate of the electronic expansion valve 100, the rotor 22 is used to drive the nut 21 to rotate so as to ensure that the nut 21 can be linked with the valve core assembly 30, and the first limiting member 23 is used to fix the nut 21 and the rotor 22.

A cavity (not labeled) for accommodating the valve needle assembly 30 is formed in the middle of the nut 21, the nut 21 comprises a connecting part 211 and an abutting part 212, and the connecting part 211 is clamped into the rotor 22, so that the nut 21 and the rotor 22 are ensured to be relatively fixed in the radial direction, and the stability of the rotor 22 driving the nut 21 to move is ensured; the abutting portion 212 acts on the valve needle assembly 30, a clamping groove (not labeled) is formed in the abutting portion 212, one end of the first limiting member 23 is clamped to the clamping groove, the other end of the first limiting member 23 is matched with the surface of the rotor 22, and the first limiting member 23 can limit the nut 21 to be separated from the rotor 22, so that the nut 21 and the rotor 22 are guaranteed to be axially fixed relatively, and the stability of the movement of the nut 21 and the rotor 22 is also guaranteed.

The valve needle assembly 30 includes a guide sleeve 31, a valve needle 32, a positioning member 33, a first elastic member 34 and a second elastic member 35, wherein the valve needle 32 is connected to the positioning member 33, the guide sleeve 31 is used for guiding axial movement of the valve needle 32, the valve needle 32 is used for opening or closing the valve port 132, the positioning member 33 is used for driving the valve needle 32 to move, the first elastic member 34 is used for driving and buffering movement of the valve needle 32, and the second elastic member 35 is used for ensuring stable connection between the rotor assembly 20 and the guide sleeve 31.

The guide sleeve 31 is fixedly connected with the valve body 13, the nut 21 is sleeved on the guide sleeve 31, an external thread section (not shown) is arranged on the outer wall of the guide sleeve 31, an internal thread section (not shown) is arranged on the inner wall forming the cavity of the nut 21, the external thread section of the guide sleeve 31 is matched with the internal thread section of the nut 21, the guide sleeve 31 is screwed with the nut 21, the nut 21 can rotate under the drive of the rotor 22, the rotating nut 21 can move upwards or downwards relative to the guide sleeve 31 through threads, and further the nut 21 can drive the valve needle assembly 30 to move, so that the flow regulation of the electronic expansion valve 100 is realized.

It will be appreciated that in other embodiments, the outer wall of the guide sleeve 31 may be provided with internal thread segments and the inner wall defining the cavity of the nut 21 may be provided with external thread segments, provided that the nut 21 is rotationally displaceable relative to the guide sleeve 31.

The guide sleeve 31 is further provided with a second limiting member 311, the second limiting member 311 is disposed at the bottom of the nut 21, the nut 21 is screwed with the guide sleeve 31, and the guide sleeve 31 is fixedly disposed. When the nut 21 moves downward relative to the guide sleeve 31, the second limiting member 311 can limit the axial displacement of the nut 21, so as to prevent the internal thread section from being separated from the external thread section due to the rotation transition of the nut 21, and ensure that the nut 21 can normally drive the valve needle assembly 30 to move, thereby realizing the flow control of the electronic expansion valve 100.

In this embodiment, the second limiting member 311 is a limiting block, and the limiting block and the guide sleeve 31 are an integrally formed structure, so that the processing is convenient and the cost is saved; it is understood that, in other embodiments, the second limiting member 311 may also be other limiting structures or other connection manners, and is not limited specifically.

The valve needle 32 passes through the nut 21 and the guide sleeve 31 in sequence and is engaged with the valve port 132, and the movement of the valve needle 32 can realize the opening or closing of the valve port 132, thereby realizing the flow regulation of the electronic expansion valve 100. The valve needle 32 penetrates through the guide sleeve 31, the guide sleeve 31 plays a role in guiding the axial movement of the valve needle 32, the guide sleeve 31 enables the valve needle 32 to be accurately matched with the valve port 132, and the opening and the closing of the electronic expansion valve 100 are smoothly coordinated.

The positioning member 33 is sleeved and fixed on the end of the valve needle 32, which penetrates through the nut 21, the nut 21 is disposed at the bottom of the positioning member 33, and when the nut 21 moves relative to the guide sleeve 31, the abutting portion 212 can drive the valve needle 32 to move by abutting against the positioning member 33, so as to open or close the valve port 132, and ensure normal throttling of the electronic expansion valve 100.

In the embodiment, the positioning part 33 and the valve needle 32 are fixedly connected by laser welding, and the operation is simpler by adopting the connection mode; it will be appreciated that in other embodiments, the positioning member 33 and the valve needle 32 may be secured by other means such as adhesive bonding.

Referring to fig. 2, fig. 2 is an enlarged schematic view of the electronic expansion valve shown in fig. 1 at a. The positioning element 33 extends towards the end of the nut 21 and forms an annular guide portion 331, the guide portion 331 surrounds the abutting portion 212 of the nut 21, the guide portion 331 and the nut 21 are in line contact, and the nut 21 can abut against the guide portion 212 and drive the valve needle 32 to move, thereby opening or closing the electronic expansion valve 100.

In the present embodiment, the guide portion 331 is continuous and annular; it is understood that in other embodiments, the guiding portion 331 may have a discontinuous ring shape as long as the guiding portion 331 and the nut 21 are in line contact.

In a traditional electronic expansion valve, the positioning part is in surface-to-surface contact with the nut, the positioning part and the valve needle can be tilted when being fixed and processed, namely, the valve needle is normal relative to the valve port in verticality, and the positioning part is inclined and non-coaxial relative to the valve needle. When the nut abuts against the positioning piece to drive the valve needle to move. As the retainer is deflected relative to the valve needle, the nut first abuts the retainer in a point contact. Under the action of force, the positioning piece can be rotated to be positive by deflection, and the positioning piece is in surface-to-surface contact with the nut, so that the valve needle deflects relative to the valve port, the electronic expansion valve cannot be accurately throttled, and the electronic expansion valve is not smoothly opened or closed. In the past, the valve needle is seriously abraded on one side, and the electronic expansion valve cannot realize the throttling function.

The utility model discloses in, nut 21 is established to the guide part 331 ring, nut 21 and guide part 331 line contact to avoided the face-to-face contact between nut 21 and the setting element 33, under the effect of power, because processing leads to the setting element 33 of relative needle 32 incline can not take place to deflect, further avoid needle 32 incline, ensure the accurate cooperation of needle 32 and valve port 132, guarantee electronic expansion valve 100 normal use.

The end surface of the guiding portion 331 in line contact with the nut 21 is a guiding surface 332, the guiding surface 332 is a plane, and the guiding surface 332 is arranged obliquely relative to the axial direction of the valve needle 32, so that the line contact between the nut 21 and the guiding surface 332 is favorably maintained, the valve needle 32 is prevented from deflecting, and the electronic expansion valve 100 is prevented from being damaged.

The guide surface 332 is inclined at an angle of 30 ° to 60 ° with respect to the axial direction of the valve needle 32, and the inclination angle of the guide surface 332 is set in this range, so that the line contact between the nut 21 and the guide surface 332 is more reliable, and the normal engagement of the valve needle 32 with the valve port 132 is further ensured.

The inclination angle of the guide surface 332 with respect to the axial direction of the valve needle 32 is preferably 30 ° to 60 ° only in the present embodiment; it is understood that in other embodiments, the inclination angle of the guiding surface 332 with respect to the axial direction of the valve needle 32 can be set to other values, which is not specifically limited as long as the nut 21 can drive the valve needle 32 to move without deflecting the valve needle 32.

It should be noted that the continuous line contact is a ring-shaped contact line formed between the guide surface 332 and the nut 32, and the contact line may be a continuous ring-shaped or a discontinuous ring-shaped contact line depending on the shape and structure of the guide portion 331.

In the present embodiment, one end of the nut 32 contacting the guide portion 331 is provided with a rounded section, the nut 32 is in line contact with the guide portion 331 through the rounded section, and the arrangement of the rounded section is favorable for line contact matching between the nut 32 and the guide portion 331; it is understood that in other embodiments, the nut 32 may not be provided with the rounded section, as long as the line contact between the nut 32 and the guide portion 331 is satisfied.

The first elastic element 34 is disposed in the inner cavity of the nut 21 and clamped between the needle 32 and the nut 21, when the nut 21 drives the needle 32 to move downward to adjust the flow rate, the nut 21 drives the needle 32 to move through the first elastic element 34, and the first elastic element 34 also plays a role in buffering, so that the movement of the needle 32 is more coordinated.

The second elastic element 35 is sleeved on the nut 21, and when the nut 21 drives the valve needle 32 to move upwards to adjust the flow rate, the second elastic element 35 can abut against the nut 21, so that the threaded fit between the nut 21 and the guide sleeve 31 is ensured, the nut 21 is prevented from being separated from the guide sleeve 31, and the normal operation of the electronic expansion valve 100 is facilitated.

In the present embodiment, the first elastic member 34 and the second elastic member 35 are both springs; it is understood that in other embodiments, the first elastic member 34 and the second elastic member 35 may be other elastic members.

Referring to fig. 3, fig. 3 is a partially enlarged view of an electronic expansion valve a according to another embodiment. In another embodiment, the difference from the present embodiment is that the guide surface 332 is a cambered surface, and the guide surface 332 is configured as a cambered surface to ensure the reliability of the line contact between the guide surface 332 and the nut 32, and also to prevent the valve needle 32 from deflecting, which is beneficial to the normal operation of the electronic expansion valve 100.

The operation of the electronic expansion valve 100 is as follows:

the rotor 22 can rotate under the action of the magnetic field force of the electromagnetic coil (not shown), the nut 21 is clamped in the rotor 22, the rotor 22 can drive the nut 21 to rotate, the nut 21 and the guide sleeve 31 are in threaded connection, the rotated nut 21 can move upwards or downwards relative to the guide sleeve 31, the nut 21 abuts against the guide part 331 of the positioning part 33, and the first elastic part 34 is clamped between the nut 21 and the valve needle 32; when the nut 21 moves upward, the nut 21 drives the valve needle 32 to move upward through the guiding portion 331, the valve needle 32 can be engaged with the valve port 132, the valve needle 32 moves upward, the valve port 132 is opened, and the electronic expansion valve 100 circulates; when the nut 21 moves downwards, the nut 21 drives the valve needle 32 to move downwards through the first elastic element 34, the valve needle 32 can be engaged with the valve port 132, the valve needle 32 moves downwards, the valve port 132 is closed, and the electronic expansion valve 100 is closed.

The utility model provides an electronic expansion valve 100, setting element 33 has guide 331, be line contact between guide 331 and the nut 21, when nut 21 supports and holds guide 331 and drive needle 32 and remove the regulation flow, the incline can not take place for needle 32, prevent that needle 32 from wearing and tearing, be favorable to the accurate throttle of electronic expansion valve 100, after long-term the use, guarantee electronic expansion valve 100's throttle function equally and not destroyed, ensure that electronic expansion valve 100 normally works.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electronic expansion valve (100) comprising a valve needle assembly (30) and a rotor assembly (20); valve needle subassembly (30) are including valve needle (32) and setting element (33), rotor subassembly (20) are including nut (21), valve needle (32) are worn to locate nut (21), setting element (33) cover is established and is fixed in valve needle (32), setting element (33) are arranged in the top of nut (21), its characterized in that, setting element (33) orientation the one end of nut (21) is extended and is formed annular guide portion (331), guide portion (331) enclose establish nut (21) and with nut (21) line contact.

2. An electronic expansion valve (100) according to claim 1, wherein the end surface of the guide portion (331) contacting the nut (21) is a guide surface (332), the guide surface (332) being arranged obliquely with respect to the axis of the valve needle (32), the guide surface (332) being a flat surface.

3. An electronic expansion valve (100) according to claim 2, wherein the angle of inclination of the guide surface (332) with respect to the axial direction of the valve needle (32) is 30 ° to 60 °.

4. An electronic expansion valve (100) according to claim 1, wherein the end surface of the guide portion (331) contacting the nut (21) is a guide surface (332), and the guide surface (332) is an arc surface.

5. The electronic expansion valve (100) of claim 1, wherein a rounded section is provided between the end and the side of the nut (21), the nut (21) line-contacting the guide (331) through the rounded section.

6. The electronic expansion valve (100) according to claim 1, wherein the rotor assembly (20) further comprises a rotor (22), and the rotor (22) is connected to the nut (21) and is capable of rotating the nut (21).

7. The electronic expansion valve (100) according to claim 6, wherein the rotor assembly (20) further comprises a first retaining member (23), and the first retaining member (23) is engaged with and fixes the nut (21) and the rotor (22).

8. The electronic expansion valve (100) according to claim 1, wherein the valve needle assembly (30) further comprises a guide sleeve (31), the valve needle (32) passes through the guide sleeve (31), the nut (21) is sleeved on the guide sleeve (31), and the nut (21) is threaded on the guide sleeve (31) and can move relative to the guide sleeve (31).

9. The electronic expansion valve (100) according to claim 8, wherein a second stop member (311) is disposed on the guide sleeve (31), and the second stop member (311) is disposed at the bottom of the nut (21) and limits the axial movement of the nut (21).

10. The electronic expansion valve (100) of claim 1, wherein the electronic expansion valve (100) further comprises a valve body assembly (10), the valve body assembly (10) comprising a valve body (13), a liquid inlet pipe (11) and a liquid outlet pipe (12), the liquid inlet pipe (11) and the liquid outlet pipe (12) both being in communication with the valve body (13).