CN215763306U

CN215763306U - Electronic expansion valve

Info

Publication number: CN215763306U
Application number: CN202122112662.6U
Authority: CN
Inventors: 张克鹏; 贺宇辰
Original assignee: Nanchang Zhonghao Machinery Co ltd
Current assignee: Nanchang Zhonghao Machinery Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-02-08
Anticipated expiration: 2031-09-02

Abstract

The utility model provides an electronic expansion valve, comprising: the valve body is provided with a containing cavity and a valve port; the guide sleeve is arranged in the accommodating cavity and is provided with a guide hole and an avoidance hole which are sequentially communicated along the axial direction; the valve core assembly is movably arranged in the guide sleeve and comprises a spring sleeve and a valve needle, the spring sleeve is movably arranged in the guide hole, the valve needle penetrates through the spring sleeve, the valve needle penetrates out of the avoiding hole and is arranged corresponding to the valve port, and the range of a gap a1 between the periphery of the valve needle and the inner wall of the avoiding hole is 0.0075mm to 0.04 mm. By adopting the technical scheme, the problems of large valve needle jitter and large noise of the electronic expansion valve in the prior art are solved.

Description

Electronic expansion valve

Technical Field

The utility model relates to the field of control valves, in particular to an electronic expansion valve.

Background

The electronic expansion valve is used as an electronic control element, can realize the optimal control of the system due to high precision, and has wide application in a refrigeration system. However, in the existing electronic expansion valve, the fluid pressure fluctuation in the valve cavity can cause large valve needle vibration in the working process, and further, the problem of large mechanical or fluid noise is caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic expansion valve, which aims to solve the problems of large valve needle jitter and large noise of the electronic expansion valve in the prior art.

The utility model provides an electronic expansion valve, comprising: the valve body is provided with a containing cavity and a valve port; the guide sleeve is arranged in the accommodating cavity and is provided with a guide hole and an avoidance hole which are sequentially communicated along the axial direction; the valve core assembly is movably arranged in the guide sleeve and comprises a spring sleeve and a valve needle, the spring sleeve is movably arranged in the guide hole, the valve needle penetrates through the spring sleeve, the valve needle penetrates out of the avoiding hole and is arranged corresponding to the valve port, and the range of a gap a1 between the periphery of the valve needle and the inner wall of the avoiding hole is 0.0075mm to 0.04 mm. If a1 is less than 0.0075mm, the clearance between the valve needle and the avoidance hole is too small, the friction between the valve needle and the avoidance hole is large when the valve needle moves relative to the guide sleeve, so that the resistance of the movement of the valve needle is increased, and the possibility of card sending due to too small clearance exists. If a1 is greater than 0.04mm, the coaxiality between the valve needle and the valve port is poor, and the valve needle is prone to have the problems of large jitter and large mechanical or fluid noise during movement. Therefore, setting the range of a1 to be between 0.0075mm and 0.04mm can ensure small movement resistance of the valve needle, small jitter of the valve needle and small mechanical or fluid noise of the electronic expansion valve.

By applying the technical scheme of the utility model, the range of the clearance a1 between the periphery of the valve needle and the inner wall of the avoidance hole of the guide sleeve is 0.0075mm to 0.04 mm. The range of a1 is set to be 0.0075mm to 0.04mm, so that the coaxiality of the valve needle and the valve port can be ensured, the movement resistance of the valve needle is small, the jitter of the valve needle is small, and the mechanical or fluid noise of the electronic expansion valve is small.

Further, the electronic expansion valve further comprises a screw rod, the screw rod is movably arranged in the valve body, and the valve core assembly further comprises a bearing, a spring and a gasket. The bearing is arranged in the spring sleeve and comprises an inner ring and an outer ring, and the end part of the screw rod penetrates through the spring sleeve and is fixedly connected with the inner ring; the spring is arranged in the spring sleeve, and one end of the spring is abutted to the valve needle; the gasket sets up in the spring housing, and the gasket is located between spring and the bearing, the one end of gasket and the other end butt of spring, the other end of gasket and the outer lane butt of bearing. The screw rod is connected in the nut sleeve in a threaded manner, the nut sleeve is arranged in the valve body, the screw rod linearly moves along the nut sleeve when rotating, and the screw rod drives the gasket, the spring and the valve needle to linearly move, so that the valve needle is blocked or kept away from the valve port.

Further, the clearance between the shim and the spring sleeve is a2, and a1 is less than or equal to a 2. If a1 is larger than a2, the clearance between the valve needle and the guide sleeve is larger, so that the coaxiality of the valve needle and the valve port is poor, and the valve needle can shake when moving. Therefore, the a1 is less than or equal to a2, the coaxiality of the valve needle and the guide sleeve can be ensured to be better, and the valve needle has small jitter and mechanical noise.

Further, the clearance between the bearing and the spring housing is a3, and a1 is less than or equal to a 3. If a1 is larger than a3, the clearance between the valve needle and the guide sleeve is larger, and the coaxiality of the valve needle and the valve port is poorer. Therefore, the a1 is less than or equal to a3, the coaxiality of the valve needle and the guide sleeve can be ensured to be better, and the valve needle has small jitter and mechanical noise.

Further, the clearance between the spring sleeve and the guide sleeve is a4, and a1 is less than or equal to a 4. If a1 is larger than a4, the clearance between the valve needle and the guide sleeve is large, so that the valve needle and the valve port are not coaxial, the valve needle shakes during movement, and large noise is generated. Therefore, the a1 is less than or equal to a4, the coaxiality of the valve needle and the guide sleeve can be ensured to be better, and the valve needle has small jitter and mechanical noise.

Further, the gap a2 between the shim and the spring case ranges from 0.04mm to 0.15 mm. When a2 is less than 0.04mm, the friction between the washer and the spring housing is large. When a2 is larger than 0.15mm, the coaxiality of the gasket and the spring sleeve is poor, so that the coaxiality of the spring, the valve needle and the valve port is poor.

Further, the gap a3 between the bearing and the spring housing ranges from 0.04mm to 0.15 mm. When a3 is less than 0.04mm, the friction between the bearing and the spring housing is large. When a3 is larger than 0.15mm, the coaxiality of the bearing and the spring sleeve is poor, so that the coaxiality of the screw rod integrated with the bearing and the valve port is poor.

Further, the gap a4 between the spring housing and the guide housing ranges from 0.04mm to 0.15 mm. When a4 is less than 0.04mm, the friction between the guide sleeve and the spring sleeve is large. When a4 is larger than 0.15mm, the coaxiality of the guide sleeve and the valve port is poor, so that the coaxiality of the spring sleeve and the valve port is poor.

Drawings

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

FIG. 1 is a schematic diagram of an electronic expansion valve provided by the present invention;

FIG. 2 shows an enlarged view at A in FIG. 1;

fig. 3 shows a schematic structural view of the guide sleeve.

Wherein the figures include the following reference numerals:

10. a valve body; 11. an accommodating chamber; 12. a valve port; 20. a guide sleeve; 21. a guide hole; 22. avoiding holes; 30. a valve core assembly; 31. a spring housing; 32. a valve needle; 33. a bearing; 34. a spring; 35. a gasket; 40. a screw; 50. and a nut sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention provides an electronic expansion valve, which includes a valve body 10, a guide sleeve 20, and a valve core assembly 30. The valve body 10 has a receiving chamber 11 and a valve port 12; the guide sleeve 20 is arranged in the accommodating cavity 11, and the guide sleeve 20 is provided with a guide hole 21 and a avoidance hole 22 which are sequentially communicated along the axial direction; the valve core assembly 30 is movably arranged in the guide sleeve 20, the valve core assembly 30 comprises a spring sleeve 31 and a valve needle 32, the spring sleeve 31 is movably arranged in the guide hole 21, the valve needle 32 penetrates through the spring sleeve 31, the valve needle 32 penetrates through the avoidance hole 22 and is arranged corresponding to the valve port 12, and a gap a1 between the periphery of the valve needle 32 and the inner wall of the avoidance hole 22 ranges from 0.0075mm to 0.04 mm. The clearance hole 22 of the guide sleeve 20 guides the valve needle 32, so that the valve needle 32 and the valve port keep good coaxiality. If a1 is less than 0.0075mm, the clearance between the valve needle 32 and the avoiding hole 22 is too small, the friction between the valve needle 32 and the guide sleeve 20 is large when the valve needle moves relative to the guide sleeve 20, so that the resistance to the movement of the valve needle 32 is increased, and the possibility of seizing due to too small clearance exists. If a1 is greater than 0.04mm, the coaxiality between the valve needle 32 and the avoiding hole 22 is poor, so that the coaxiality between the valve needle 32 and the valve port 12 is poor, and the valve needle 32 is prone to have the problems of large jitter and large mechanical or fluid noise during movement. Therefore, setting the range of a1 to be between 0.0075mm and 0.04mm can ensure small movement resistance of the valve needle 32, small fluttering of the valve needle 32, and small mechanical or fluid noise of the electronic expansion valve. In particular, a1 may range from 0.0075mm, 0.025mm or 0.04 mm.

With the application of the technical solution of the present application, the clearance a1 between the outer circumference of the valve needle 32 and the inner wall of the avoiding hole 22 of the guide sleeve 20 ranges from 0.0075mm to 0.04 mm. Setting the range of a1 to be 0.0075mm to 0.04mm can ensure the coaxiality of the valve needle 32 and the valve port 12, so that the movement resistance of the valve needle 32 is small, the vibration of the valve needle 32 is small, and the mechanical or fluid noise of the electronic expansion valve is small.

In the present embodiment, the electronic expansion valve further includes a screw 40, the screw 40 is movably disposed in the accommodating chamber 11, and the valve core assembly 30 further includes a bearing 33, a spring 34 and a gasket 35. The bearing 33 is arranged in the spring sleeve 31, the bearing 33 comprises an inner ring and an outer ring, and the end part of the screw 40 is arranged in the spring sleeve 31 in a penetrating way and is fixedly connected with the inner ring; the spring 34 is arranged in the spring sleeve 31, and one end of the spring 34 is abutted with the valve needle 32; the washer 35 is provided in the spring housing 31, the washer 35 is positioned between the spring 34 and the bearing 33, one end of the washer 35 abuts against the other end of the spring 34, and the other end of the washer 35 abuts against the outer ring of the bearing 33. The screw 40 is connected in the nut sleeve 50 in a threaded manner, the nut sleeve 50 is arranged in the valve body 10, the screw 40 moves linearly along the nut sleeve 50 when rotating, and the screw 40 drives the gasket 35, the spring 34 and the valve needle 32 to move linearly, so that the valve needle 32 blocks or is far away from the valve port 12. Through the arrangement of the bearing 33, when the valve needle 32 abuts against the valve port 12 in the valve closing process, the screw 40 continues to rotate due to the influence of coil pulse, at the moment, the inner ring of the bearing rotates, the outer ring does not move, and the spring sleeve 31, the gasket 35, the spring 34 and the valve needle 32 cannot rotate, so that the abrasion of the valve needle 32 and the valve port 12 is reduced, and the service life of the electronic expansion valve is prolonged.

Specifically, the clearance between the shim 35 and the spring case 31 is a2, and a1 is less than or equal to a 2. If a1 is greater than a2, the coaxiality between the valve needle 32 and the relief hole 22 is poor, so that the valve needle 32 and the valve port 12 are poor, and the valve needle 32 moves with high vibration and noise. Therefore, the a1 is less than or equal to a2, which can ensure better coaxiality of the valve needle 32 and the valve port 12, and ensure small jitter and small mechanical noise when the valve needle 32 moves.

Specifically, the clearance between the bearing 33 and the spring housing 31 is a3, and a1 is less than or equal to a 3. If a1 is greater than a3, the coaxiality between the valve needle 32 and the relief hole 22 is poor, so that the valve needle 32 and the valve port 12 are poor, and the valve needle 32 moves with high vibration and noise. Therefore, the a1 is less than or equal to a3, which can ensure better coaxiality of the valve needle 32 and the valve port 12, and ensure that the valve needle 32 has small vibration and small mechanical noise.

Specifically, the clearance between the spring housing 31 and the guide housing 20 is a4, and a1 is less than or equal to a 4. If a1 is greater than a4, the valve needle 32 and the relief hole 22 are less coaxial, so that the valve needle 32 and the valve port 12 are less coaxial, the valve needle 32 may flutter during movement, and large mechanical and fluid noises may be generated. Therefore, the a1 is less than or equal to a4, which can ensure better coaxiality of the valve needle 32 and the valve port 12, and ensure that the valve needle 32 has small vibration and small mechanical noise.

Specifically, the gap a2 between the shim 35 and the spring case 31 ranges from 0.04mm to 0.15 mm. a2 is less than 0.04mm, the friction between the washer 35 and the spring housing 31 is large, resulting in large mechanical noise and large resistance to movement of the washer 35. When a2 is greater than 0.15mm, the coaxiality between the gasket 35 and the spring sleeve 31 is poor, so that the coaxiality between the gasket 35 and the valve port 12 is poor, further the coaxiality between the spring 34, the valve needle 32 and the valve port 12 is poor, and the valve needle 32 has large shaking, large mechanical noise and large fluid noise when the valve core assembly moves. In particular, the gap a2 between the shim 35 and the spring sleeve 31 may be 0.04mm, 0.1mm or 0.15 mm.

Specifically, the clearance a3 between the bearing 33 and the spring housing 31 ranges from 0.04mm to 0.15 mm. a3 is less than 0.04, the friction between the bearing 33 and the spring housing 31 is large, which causes the movement resistance of the bearing 33 to be large, resulting in a slow response of the needle 32 and a loud noise. When a3 is larger than 0.15mm, the coaxiality between the bearing 33 and the spring sleeve 31 is poor, so that the coaxiality between the screw 40 integrated with the bearing and the valve port 12 is poor, further the coaxiality between the gasket 35, the spring 34, the valve needle 32 and the valve port 12 is poor, and the shaking, the mechanical noise and the fluid noise of the valve needle 32 are large when the valve core assembly moves. In particular, the clearance a3 between the bearing 33 and the spring sleeve 31 may be 0.04mm, 0.1mm or 0.15 mm.

Specifically, the clearance a4 between the spring housing 31 and the guide housing 20 ranges from 0.04mm to 0.15 mm. a4 is less than 0.04mm, the friction between the guide sleeve 20 and the spring sleeve 31 is large, so that the movement resistance of the spring sleeve 31 is large, and the response of the valve core assembly 30 is slow. When the a4 is larger than 0.15mm, the coaxiality between the guide sleeve 20 and the spring sleeve 31 is poor, so that the coaxiality between the valve needle 32 and the valve port 12 is poor, and the valve needle 32 has large shaking, large mechanical noise and large fluid noise when the valve core assembly moves. In particular, the clearance a4 between the spring sleeve 31 and the guide sleeve 20 may be 0.04mm, 0.1mm or 0.15 mm.

In the present technical solution, the range of the gap a1 between the outer circumference of the valve needle 32 and the inner wall of the avoiding hole 22 of the guide sleeve 20 is 0.0075mm to 0.04mm, which can ensure the coaxiality of the valve needle 32 and the valve port 12, so that the movement resistance of the valve needle 32 is small, the vibration of the valve needle 32 is small, and the mechanical or fluid noise of the electronic expansion valve is small. In addition, the clearance between the shim 35 and the spring case 31 is a2, a1 is less than or equal to a 2; the clearance between the bearing 33 and the spring sleeve 31 is a3, a1 is less than or equal to a 3; the clearance between the spring sleeve 31 and the guide sleeve 20 is a4, and a1 is less than or equal to a 4; so set up, can guarantee that the axiality of needle 32 and valve port 12 is better, make the shake of needle 32 little, mechanical noise is little.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. 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, comprising:

a valve body (10) having a receiving chamber (11) and a valve port (12);

the guide sleeve (20) is arranged in the accommodating cavity (11), and the guide sleeve (20) is provided with a guide hole (21) and an avoidance hole (22) which are sequentially communicated along the axial direction;

the valve core assembly (30) is movably arranged in the guide sleeve (20), the valve core assembly (30) comprises a spring sleeve (31) and a valve needle (32), the spring sleeve (31) is movably arranged in the guide hole (21), the valve needle (32) penetrates through the spring sleeve (31), the valve needle (32) penetrates out of the avoidance hole (22) and is arranged corresponding to the valve port (12), and the range of a gap a1 between the periphery of the valve needle (32) and the inner wall of the avoidance hole (22) is 0.0075mm to 0.04 mm.

2. The electronic expansion valve of claim 1, further comprising:

a screw (40), the screw (40) being movably disposed within the housing chamber (11), the valve core assembly (30) further comprising:

the bearing (33) is arranged in the spring sleeve (31), the bearing (33) comprises an inner ring and an outer ring, and the end part of the screw rod (40) penetrates through the spring sleeve (31) and is fixedly connected with the inner ring;

a spring (34) disposed within the spring housing (31), one end of the spring (34) abutting against the valve needle (32);

the gasket (35) is arranged in the spring sleeve (31), the gasket (35) is located between the spring (34) and the bearing (33), one end of the gasket (35) is abutted to the other end of the spring (34), and the other end of the gasket (35) is abutted to the outer ring of the bearing (33).

3. An electronic expansion valve according to claim 2, wherein the gap between the gasket (35) and the spring sleeve (31) is a2, a1 being less than or equal to a 2.

4. An electronic expansion valve according to claim 2, wherein the clearance between the bearing (33) and the spring housing (31) is a3, a1 being less than or equal to a 3.

5. An electronic expansion valve according to claim 2, wherein the gap between the spring sleeve (31) and the guide sleeve (20) is a4, a1 being less than or equal to a 4.

6. An electronic expansion valve according to claim 3, wherein the gap a2 between the gasket (35) and the spring sleeve (31) is in the range of 0.04mm to 0.15 mm.

7. An electronic expansion valve according to claim 4, wherein the clearance a3 between the bearing (33) and the spring sleeve (31) is in the range of 0.04mm to 0.15 mm.

8. An electronic expansion valve according to claim 5, wherein the clearance a4 between the spring sleeve (31) and the guide sleeve (20) is in the range of 0.04mm to 0.15 mm.