CN115111377A

CN115111377A - Electronic expansion valve

Info

Publication number: CN115111377A
Application number: CN202110310848.4A
Authority: CN
Inventors: 邓岳忠; 王傅钢
Original assignee: Dunan Automotive Thermal Management Technology Co Ltd
Current assignee: Dunan Automotive Thermal Management Technology Co Ltd
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2022-09-27

Abstract

The invention provides an electronic expansion valve, which comprises a driving assembly, a valve needle assembly and a valve seat assembly, wherein the valve seat assembly comprises a valve seat, a valve core seat and a soft sealing structure; the valve core seat is arranged at the opening of the valve seat and forms a first valve port, and when the valve needle closes the first valve port, the valve needle is abutted against the valve core seat to form hard seal; the soft sealing structure is positioned in the valve seat, the soft sealing structure is positioned above the valve core seat and forms a second valve port, and when the valve needle closes the second valve port, the soft sealing structure and the valve needle are abutted to form a soft seal. Through the technical scheme provided by the invention, the technical problem of poor sealing effect of the electronic expansion valve in the prior art can be solved.

Description

Electronic expansion valve

Technical Field

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

Background

At present, an electronic expansion valve in the prior art generally comprises a valve seat and a valve needle, wherein in the use process of the electronic expansion valve, a valve cavity of the valve seat moves, and the valve needle can move to a position avoiding a valve port and a position blocking the valve port so as to realize the on-off of a flow path in the valve seat.

However, during use, there are situations where the seal between the valve needle and the valve port is not tight, which can result in more internal leakage.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve to solve the technical problem that the electronic expansion valve in the prior art is poor in sealing effect.

In order to achieve the above object, the present invention provides an electronic expansion valve, which comprises a driving assembly, a valve needle assembly and a valve seat assembly, wherein the valve seat assembly comprises a valve seat, a valve core seat and a soft sealing structure, the valve needle assembly comprises a valve needle, and the valve needle is movably arranged in the valve seat under the driving of the driving assembly; the valve core seat is arranged at the opening of the valve seat and forms a first valve port, and when the valve needle closes the first valve port, the valve needle is abutted against the valve core seat to form hard seal; the soft sealing structure is positioned in the valve seat, the soft sealing structure is positioned above the valve core seat and forms a second valve port, and when the valve needle closes the second valve port, the soft sealing structure and the abutting part of the valve needle form soft sealing. Further, the soft seal structure is made of rubber.

Further, the soft sealing structure is of an annular structure, and when the valve needle closes the second valve port, at least part of the valve needle penetrates through the inner ring of the soft sealing structure.

Furthermore, a sealing end face is arranged on the soft sealing structure, the valve needle comprises a sealing matching face matched with the sealing end face, and the sealing end face is abutted against the sealing matching face to form soft sealing; the sealing end face is of a plane structure, and the sealing matching face is of a plane structure or a conical surface structure.

Furthermore, a first positioning step is arranged in the valve seat, and a second positioning step matched with the valve seat is arranged on the soft sealing structure so as to position the soft sealing structure under the matching of the first positioning step and the second positioning step.

Further, an arc-shaped concave part is arranged on the valve needle, an arc-shaped convex part matched with the arc-shaped concave part is arranged on the valve core seat, and the arc-shaped convex part is abutted against the arc-shaped concave part to form hard sealing.

Furthermore, a through channel extending in the radial direction is arranged in the valve seat, and the hard seal and the soft seal are both positioned on one side of the through channel close to the valve core seat.

Furthermore, the valve core seat is provided with a connecting end and an outlet end which are oppositely arranged, the connecting end is arranged in the valve seat, and the soft sealing structure is supported on the end face of the connecting end.

Furthermore, a positioning flange is arranged between the connecting end and the outlet end and is used for being abutted and positioned with the end part of the valve seat.

Furthermore, the electronic expansion valve also comprises a mounting base body, the valve seat assembly is mounted on the mounting base body and detachably connected with the mounting base body, and the electronic expansion valve is used on automobiles or household appliances.

By applying the technical scheme of the invention, the hard seal is formed between the valve needle and the valve core seat, the soft seal is formed between the valve needle and the soft seal structure, and the soft seal is positioned above the hard seal. By adopting the double-sealing structure, the soft sealing effect is better at the initial stage of the use of the electronic expansion valve; along with the extension of live time, the wearing and tearing that soft seal structure received increase, the running-in of valve needle and valve core case is better (the laminating effect of valve needle and valve core case is better) simultaneously, and at this moment, the hard seal can effectively play sealed effect to can guarantee that the sealing performance of electronic expansion valve in whole use is good. Therefore, the technical problem of poor sealing effect of the electronic expansion valve in the prior art can be solved through the technical scheme provided by the invention.

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 a schematic structural view of an electronic expansion valve provided with a soft seal in a face seal structure according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an electronic expansion valve with a soft seal in a line seal structure according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a valve seat; 11. a first positioning step; 12. a through passage; 20. a valve needle; 21. an arc-shaped recess; 30. a valve core seat; 31. a connecting end; 32. an outlet end; 33. a positioning flange; 40. a soft seal structure; 51. hard sealing; 52. and (4) soft sealing.

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 accompanying drawings in conjunction with embodiments.

As shown in fig. 1 and 2, an embodiment of the present invention provides an electronic expansion valve, which includes a driving assembly, a valve needle assembly and a valve seat assembly, wherein the valve seat assembly includes a valve seat 10, a valve core seat 30 and a soft sealing structure 40, the valve needle assembly includes a valve needle 20, and the valve needle 20 is movably disposed in the valve seat 10 under the driving of the driving assembly. The cartridge seat 30 is disposed at the opening of the valve seat 10 and forms a first valve port, and when the valve needle 20 closes the first valve port, the valve needle 20 abuts against the cartridge seat 30 to form a hard seal 51. The soft sealing structure 40 is located in the valve seat 10, the soft sealing structure 40 is located above the valve core seat 30 and forms a second valve port, and when the valve needle 20 closes the second valve port, the soft sealing structure forms a soft seal 52 at the position where the soft sealing structure abuts against the valve needle 20.

With the electronic expansion valve provided in the present embodiment, the soft seal 52 is formed between the valve needle 20 and the valve plug seat 30 by forming the hard seal 51 between the valve needle 20 and the soft seal structure 40, and the soft seal 52 is located above the hard seal 51. When the electronic expansion valve is closed, the valve needle 20 closes the first valve port, and also closes the second valve port, so that the valve needle 20 forms a double-sealing structure with the valve core seat 30 and the soft sealing structure 40, respectively. By adopting the double-sealing structure, the sealing effect of the soft seal 52 is better at the initial stage of the use of the electronic expansion valve; along with the lengthening of service time, the abrasion of the soft sealing structure 40 is increased, meanwhile, the running-in of the valve needle 20 and the valve core seat 30 is better (the fitting effect of the valve needle 20 and the valve core seat 30 is better), at the moment, the hard seal 51 can effectively play a role in sealing, and therefore the good sealing performance of the electronic expansion valve in the whole using process can be ensured. Therefore, the electronic expansion valve provided by the embodiment can solve the technical problem that the electronic expansion valve in the prior art is poor in sealing effect.

Specifically, the soft seal structure 40 in the present embodiment is made of a flexible material. Preferably, the soft sealing structure 40 is made of rubber to effectively ensure a sealing effect.

In this embodiment, the soft sealing structure 40 is an annular structure, when the valve needle 20 closes the second valve port, at least a portion of the valve needle 20 penetrates into an inner ring of the soft sealing structure 40, and an outer ring of the soft sealing structure 40 is attached to and positioned on an inner wall of the valve seat 10. The soft seal structure 40 with the annular structure can facilitate the formation of the soft seal 52 with better sealing effect, so as to improve the sealing effect.

Specifically, the soft seal structure 40 in this embodiment is provided with a seal end surface, and the valve needle 20 includes a seal mating surface adapted to the seal end surface, and the seal end surface is attached to the seal mating surface to form the soft seal 52, so as to improve the sealing effect of the soft seal 52. The sealing end face is of a plane structure, and the sealing matching face is of a plane structure or a conical surface structure.

As shown in fig. 1, when the sealing end face and the sealing mating face are both planar structures, the sealing end face and the sealing mating face perform fitting sealing to make the soft seal 52 be a face seal structure, and as the working time increases, the soft seal structure 40 is worn, but while the soft seal structure is worn, the hard seal 51 is also worn, so that the sealing effect is better and better.

As shown in fig. 2, when the sealing end face is a planar structure and the sealing mating face is a conical structure, the sealing end face and the sealing mating face are abutted and sealed to make the soft seal 52 be a linear sealing structure, the soft sealing structure 40 is worn along with the increase of the working time, and the sealing end face of the worn soft sealing structure 40 is matched with the sealing mating face to make the soft seal 52 be a surface sealing structure from the linear sealing structure. However, the hard seal 51 is worn out, so that the sealing effect is better and better.

In this embodiment, a first positioning step 11 is disposed in the valve seat 10, and a second positioning step adapted to the valve seat 10 is disposed on the soft sealing structure 40, so as to position the soft sealing structure 40 under the cooperation of the first positioning step 11 and the second positioning step. With such a configuration, the installation stability of the soft seal structure 40 can be improved. Specifically, the second positioning step is located on the outer ring of the soft seal structure 40.

Specifically, the valve needle 20 in this embodiment is provided with an arc-shaped concave portion 21, and the valve core seat 30 is provided with an arc-shaped convex portion matching with the arc-shaped concave portion 21, and the arc-shaped convex portion abuts against the arc-shaped concave portion 21 to form the hard seal 51. With such a structure of the hard seal 51, the contact area between the arc-shaped concave portion 21 and the arc-shaped convex portion can be increased, so that the sealing effect of the hard seal structure can be improved.

In this embodiment, a radially extending through passage 12 is provided in the valve seat 10, and both the hard seal 51 and the soft seal 52 are located on a side of the through passage 12 adjacent to the valve cartridge seat 30. Specifically, with such a structural arrangement, it is possible to facilitate effectively isolating and sealing the liquid in the through passage 12 from the passage in the valve cartridge seat 30 or enabling the liquid in the through passage 12 to communicate with the passage in the valve cartridge seat 30.

Specifically, the valve seat 30 in the present embodiment has a connecting end 31 and an outlet end 32 which are oppositely arranged, the connecting end 31 is arranged in the valve seat 10, and the soft seal structure 40 is supported on an end surface of the connecting end 31. With such a structural arrangement, it is possible to facilitate improvement of the compactness of the arrangement of the soft seal structure 40, and to optimize the compactness of the internal structure of the valve seat 10. Specifically, the sealing end face of the soft sealing structure 40 in this embodiment is arranged on the end face of the connecting end 31, the end face of the connecting end 31 is the sealing end face, the second positioning step of the soft sealing structure 40 is in positioning fit with the first positioning step 11 on the inner wall of the valve seat 10, and the assembling structure can further improve the setting stability of the internal structure and improve the compactness and rationality of the structural layout.

In the present embodiment, a positioning flange 33 is further disposed between the connecting end 31 and the outlet end 32, and the positioning flange 33 is used for abutting and positioning an end of the valve seat 10, so as to position and mount the valve core seat 30 through the positioning flange 33.

Specifically, drive assembly in this embodiment includes rotor subassembly, nut component, and the rotor subassembly cover is established in the nut component outside and can rotate under the drive of external coil, and rotor subassembly and needle subassembly fixed connection drive the needle subassembly and carry out axial displacement and rotation, and the needle subassembly is equipped with the external screw thread, nut component and disk seat subassembly fixed connection, establish in the nut component with needle external screw thread threaded connection's internal thread.

In this embodiment, the valve needle assembly includes a screw, a spring sleeve, a spring and a valve needle 20, one end of the spring sleeve is sleeved on the end of the valve needle, the other end of the spring sleeve is connected with the screw, and the spring is installed in the spring sleeve; one end of the screw is connected with the spring sleeve, and the other end of the screw is fixedly connected with the rotor component.

Specifically, the valve seat assembly in this embodiment further includes a support seat, and the valve seat 10 is fixedly connected to or integrally formed with the support seat.

In this embodiment, the electronic expansion valve further includes a mounting base, and the valve seat assembly is mounted on the mounting base and detachably connected to the mounting base.

Specifically, the electronic expansion valve in the present embodiment is mainly used in an automobile or a household appliance. From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: reduce the internal leakage defective rate, through setting up the double containment structure of hard seal and soft seal, the soft seal of electronic expansion valve's use earlier stage receives wearing and tearing, and the sealed effect of hard seal at the running-in-process will progressively promote simultaneously.

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 exemplary 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 application 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 one 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 application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; 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, so that the scope of the present application is not to 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 comprises a driving assembly, a valve needle assembly and a valve seat assembly, wherein the valve seat assembly comprises a valve seat (10), a valve core seat (30) and a soft sealing structure (40), the valve needle assembly comprises a valve needle (20), and the valve needle (20) is movably arranged in the valve seat (10) under the driving of the driving assembly; the valve core seat (30) is arranged at the opening of the valve seat (10) and forms a first valve port, and when the valve needle (20) closes the first valve port, the valve needle (20) is abutted with the valve core seat (30) to form a hard seal (51); the soft sealing structure (40) is positioned in the valve seat (10), the soft sealing structure (40) is positioned above the valve core seat (30) and forms a second valve port, and when the valve needle (20) closes the second valve port, a soft seal (52) is formed at the abutting part of the soft sealing structure (40) and the valve needle (20).

2. An electronic expansion valve according to claim 1, wherein the soft sealing structure (40) is made of rubber.

3. An electronic expansion valve according to claim 1, wherein the soft sealing structure (40) is an annular structure, and at least part of the valve needle (20) is arranged to penetrate inside an inner ring of the soft sealing structure (40) when the valve needle (20) closes the second valve port.

4. The electronic expansion valve according to claim 1, wherein a sealing end face is provided on the soft sealing structure (40), the valve needle (20) comprises a sealing mating face adapted to the sealing end face, and the sealing end face abuts against the sealing mating face to form the soft seal (52);

the sealing end face is of a plane structure, and the sealing matching face is of a plane structure or a conical surface structure.

5. An electronic expansion valve according to claim 1, wherein a first positioning step (11) is arranged in the valve seat (10), and a second positioning step adapted to the valve seat (10) is arranged on the soft sealing structure (40) to position the soft sealing structure (40) in cooperation with the first positioning step (11) and the second positioning step.

6. An electronic expansion valve according to claim 1, wherein the valve needle (20) is provided with an arc-shaped recess (21), and the valve core seat (30) is provided with an arc-shaped protrusion adapted to the arc-shaped recess (21), and the arc-shaped protrusion abuts against the arc-shaped recess (21) to form the hard seal (51).

7. An electronic expansion valve according to claim 1, wherein a radially extending through-channel (12) is provided in the valve seat (10), the hard seal (51) and the soft seal (52) both being located at a side of the through-channel (12) close to the valve core seat (30).

8. The electronic expansion valve according to claim 7, wherein the valve cartridge seat (30) has an oppositely disposed connection end (31) and an outlet end (32), the connection end (31) being disposed within the valve seat (10), the soft seal structure (40) being supported on an end face of the connection end (31).

9. An electronic expansion valve according to claim 8, wherein a positioning flange (33) is further provided between the connecting end (31) and the outlet end (32), the positioning flange (33) being adapted to be positioned in abutment with an end of the valve seat (10).

10. The electronic expansion valve according to any of claims 1 to 9, further comprising a mounting base, wherein the valve seat assembly is mounted on and detachably connected to the mounting base, and wherein the electronic expansion valve is used in an automobile or in a household appliance.