CN218523044U - Electronic expansion valve - Google Patents
Electronic expansion valve Download PDFInfo
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- CN218523044U CN218523044U CN202222918868.2U CN202222918868U CN218523044U CN 218523044 U CN218523044 U CN 218523044U CN 202222918868 U CN202222918868 U CN 202222918868U CN 218523044 U CN218523044 U CN 218523044U
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- valve
- guide sleeve
- electronic expansion
- seat
- limiting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The utility model provides an electronic expansion valve, it includes: the valve seat is provided with a valve cavity and a mounting port which are communicated with each other, the valve seat is also provided with a valve port, the valve port is communicated with the valve cavity, and the valve seat is provided with a first limiting structure; the nut seat is provided with a first end and a second end which are arranged oppositely, the first end of the nut seat is arranged at the mounting opening, and the first end of the nut seat is provided with a second limiting structure; the guide sleeve is arranged in the valve cavity and provided with a first end and a second end which are oppositely arranged, the peripheral surface of the first end of the guide sleeve is in limit fit with the first limit structure, and the peripheral surface of the second end of the guide sleeve is in limit fit with the second limit structure so as to limit the position of the guide sleeve; and the valve core assembly is arranged on the guide sleeve in a penetrating manner and is used for adjusting the flow at the valve opening. Through the technical scheme of this application, can solve the problem that the regulation precision of case subassembly among the prior art to the flow of valve port department is low.
Description
Technical Field
The utility model relates to the technical field of valves, particularly, relate to an electronic expansion valve.
Background
The valve seat of the electronic expansion valve is provided with a valve port, the nut seat is connected with the valve seat, the guide sleeve of the electronic expansion valve is arranged between the nut seat and the valve seat and guides the movement of the valve core assembly, and the valve core assembly regulates the flow of the valve port. However, the guide sleeve and the valve seat in the prior art have poor coaxiality, which results in poor coaxiality of the valve core assembly and the valve seat, and thus the valve core assembly has low accuracy in adjusting the flow at the valve port.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electronic expansion valve to solve the problem that the case subassembly among the prior art is low to the regulation precision of the flow of valve port department.
The utility model provides an electronic expansion valve, it includes: the valve seat is provided with a valve cavity and a mounting port which are communicated with each other, the valve seat is also provided with a valve port, the valve port is communicated with the valve cavity, and the valve seat is provided with a first limiting structure; the nut seat is provided with a first end and a second end which are arranged oppositely, the first end of the nut seat is arranged at the mounting opening, and the first end of the nut seat is provided with a second limiting structure; the guide sleeve is arranged in the valve cavity and provided with a first end and a second end which are oppositely arranged, the peripheral surface of the first end of the guide sleeve is in limit fit with the first limit structure, and the peripheral surface of the second end of the guide sleeve is in limit fit with the second limit structure so as to limit the position of the guide sleeve; the valve core assembly penetrates through the guide sleeve and is used for adjusting the flow at the valve opening.
Furthermore, the bottom of the valve cavity is provided with a limiting groove, the limiting groove is positioned at the periphery of the valve port, and the first end of the guide sleeve is arranged in the limiting groove in a penetrating mode and in limiting fit with the inner wall of the limiting groove.
Furthermore, the cross section of the limiting groove is circular, and the first end of the guide sleeve is in interference fit with the limiting groove.
Further, the depth of the limiting groove is larger than or equal to 1.5mm.
Further, the valve port is arranged at the bottom of the limiting groove and is coaxial with the limiting groove.
Further, the valve seat comprises a body part and a convex part which are integrally connected along the axis direction, and one end of the valve port, which is far away from the limiting groove, extends to the end surface of the convex part.
Furthermore, a first end of the nut seat is provided with a limiting hole, a step surface is arranged in the limiting hole, a second end of the guide sleeve penetrates through the limiting hole and is in interference fit with the limiting hole, and the end face of the second end of the guide sleeve is abutted to the step surface.
Furthermore, the side wall of the valve seat is provided with a first communicating hole, the electronic expansion valve further comprises a first communicating pipe and a second communicating pipe, the first communicating pipe is communicated with the first communicating hole, and the second communicating pipe is sleeved on the periphery of the protruding portion and is welded and fixed with the valve seat.
Furthermore, an avoiding groove is formed in the end face of one end, connected with the protruding portion, of the body portion, the avoiding groove is annularly arranged on the periphery of the protruding portion, the diameter of the avoiding groove is larger than the outer diameter of the second communicating pipe, and the end portion of the second communicating pipe is located in the avoiding groove.
Further, along the axis direction of the valve seat, a gap is formed between the first communication hole and the inner end face of one end, far away from the mounting opening, of the valve seat.
Use the technical scheme of the utility model, first limit structure and second limit structure carry on spacingly to the outer peripheral face of the first end of uide bushing and the outer peripheral face of the second end of uide bushing respectively to promote the axiality of uide bushing, nut seat and disk seat. Specifically, first limit structure and second limit structure carry on spacingly to the outer peripheral face of the first end of uide bushing and the outer peripheral face of the second end of uide bushing respectively, so set up, as long as guarantee the machining precision to the outer peripheral face of uide bushing, can guarantee the outer peripheral face of uide bushing and the axiality of disk seat and nut seat, promote the installation precision of disk seat and uide bushing and the installation precision of uide bushing and nut seat, the stability of uide bushing has been guaranteed, reduce the condition that the uide bushing takes place the slope, the axiality of case subassembly and disk seat has been guaranteed, the accuracy nature of opening and closing valve process and flow control process has been guaranteed.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 diagram of an electronic expansion valve according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram illustrating the cooperation between a valve seat and a guide sleeve of an electronic expansion valve provided by an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a valve seat of an electronic expansion valve provided in an embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a valve seat; 101. a valve cavity; 102. an installation port; 103. a valve port;
104. a limiting groove;
105. a first communication hole;
11. a body portion; 111. an avoidance groove;
12. a boss portion;
20. a nut seat; 201. a limiting hole;
30. a guide sleeve; 301. a flow-through hole;
40. a valve core assembly;
50. a first communication pipe;
60. and a second communication pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 3, the present invention provides an electronic expansion valve, which includes a valve seat 10, a nut seat 20, a guide sleeve 30 and a valve core assembly 40. The valve seat 10 has a valve cavity 101 and an installation port 102 which are communicated with each other, the valve seat 10 further has a valve port 103, the valve port 103 is communicated with the valve cavity 101, and the valve seat 10 is provided with a first limiting structure. The nut seat 20 has a first end and a second end which are oppositely arranged, the first end of the nut seat 20 is arranged at the mounting opening 102, and the first end of the nut seat 20 is provided with a second limiting structure. The guide sleeve 30 is arranged in the valve cavity 101, the guide sleeve 30 is provided with a first end and a second end which are oppositely arranged, the outer peripheral surface of the first end of the guide sleeve 30 is in limit fit with the first limit structure, and the outer peripheral surface of the second end of the guide sleeve 30 is in limit fit with the second limit structure so as to limit the position of the guide sleeve 30. The valve core assembly 40 is arranged on the guide sleeve 30 in a penetrating manner, and the valve core assembly 40 is used for adjusting the flow at the valve port 103.
Use the technical scheme of the utility model, first limit structure and second limit structure carry on spacingly to the outer peripheral face of the first end of uide bushing 30 and the outer peripheral face of the second end of uide bushing 30 respectively to promote the axiality of uide bushing 30, nut seat 20 and disk seat 10. Specifically, the first limit structure and the second limit structure respectively limit the outer peripheral surface of the first end of the guide sleeve 30 and the outer peripheral surface of the second end of the guide sleeve 30, so as to ensure the processing precision of the outer peripheral surface of the guide sleeve 30, the coaxiality of the outer peripheral surface of the guide sleeve 30, the valve seat 10 and the nut seat 20 can be ensured, the installation precision of the valve seat 10 and the guide sleeve 30 and the installation precision of the guide sleeve 30 and the nut seat 20 are improved, the stability of the guide sleeve 30 is ensured, the condition that the guide sleeve 30 inclines is reduced, the coaxiality of the valve core assembly 40 and the valve seat 10 is ensured, and the accuracy of the opening and closing valve process and the flow regulation process is ensured. In the conventional technical scheme, the inner peripheral surface of the first end of the guide sleeve 30 is in limit fit with the valve seat 10, and the outer peripheral surface of the guide sleeve 30 is in limit fit with the nut seat 20, so that the coaxiality between the inner peripheral surface and the outer peripheral surface of the guide sleeve 30 is difficult to ensure, therefore, the coaxiality between the guide sleeve 30 and the nut seat 20 and between the guide sleeve 30 and the valve seat 10 is difficult to ensure, and further the coaxiality between the valve core assembly 40 and the valve seat 10 is influenced, and the flow regulation precision of the valve core assembly 40 to the valve port 103 is influenced. In addition, compared with the prior art, the arrangement of the scheme reduces the requirement on the coaxiality between the outer circumferential surface and the inner circumferential surface of the guide sleeve 30, and further reduces the processing cost of the guide sleeve 30.
Specifically, the bottom of the valve cavity 101 is provided with a limiting groove 104, the limiting groove 104 is located at the periphery of the valve port 103, the limiting groove 104 is coaxial with the valve port 103, and the first end of the guide sleeve 30 penetrates through the limiting groove 104 and is in limiting fit with the inner wall of the limiting groove 104. A plurality of flow holes 301 are provided on the side wall of the guide sleeve 30 so that the inside and the outside of the guide sleeve 30 communicate with each other through the flow holes 301. The number of the convection through holes 301 in the present scheme is not limited, and in this embodiment, four circulation holes 301 are arranged at intervals along the circumferential direction of the guide sleeve. The limiting groove 104 is simple in structure and facilitates machining and forming of the valve seat 10.
Specifically, the cross section of the limiting groove 104 is circular, and the first end of the guide sleeve 30 is in interference fit with the limiting groove 104. The cross section of the limiting groove 104 is set to be circular, so that the valve seat 10 can be conveniently machined and molded. The first end of the guide sleeve 30 is in interference fit with the limiting groove 104, so that convenience and stability in installation of the first end of the guide sleeve 30 and the valve seat 10 can be guaranteed. Wherein, the diameter of the outer circumferential surface of the guide sleeve 30 may be the same along the axial direction of the guide sleeve 30. In the present embodiment, the diameter of the outer peripheral surface of the first end of the guide sleeve 30 is smaller than the diameter of the main body section and the outer peripheral surface of the first end of the guide sleeve 30 in the axial direction of the guide sleeve 30.
Further, the depth of the limiting groove 104 is greater than or equal to 1.5mm. When the depth of the limiting groove 104 is less than 1.5mm, the guide sleeve 30 may be inclined, which affects the coaxiality between the guide sleeve 30 and the valve seat 10, and when the depth of the limiting groove 104 is less than 1.5mm, the stability of the connection between the guide sleeve 30 and the valve seat 10 is poor. The degree of depth of spacing groove 104 can enough guarantee the axiality of uide bushing 30 and disk seat 10 more than or equal to 1.5mm in this scheme, also can guarantee the stability that uide bushing 30 and disk seat 10 are connected. Wherein, the depth of spacing groove 104 can set up to 1.5mm, 1.7mm or 1.9mm, and in this embodiment, the depth of spacing groove 104 is 1.5mm.
Further, the valve port 103 is disposed at the bottom of the limiting groove 104, and is disposed coaxially with the limiting groove 104. By the arrangement, the matching precision of the valve core assembly 40 and the valve port 103 can be ensured, and the regulation precision of the valve core assembly 40 on the flow at the valve port 103 can be further ensured.
As shown in fig. 1 and 2, the valve seat 10 includes a body 11 and a boss 12 integrally connected in an axial direction, and one end of the valve port 103 away from the stopper groove 104 extends to an end surface of the boss 12. Wherein, the valve seat 10 can be integrally formed by adopting a cold heading process or can be formed by finish turning. In this scheme, valve port 103 includes cylindrical hole and the bell mouth that communicates in proper order along the axis direction of disk seat 10, and the one end and the spacing groove 104 intercommunication of keeping away from the bell mouth in cylindrical hole, the one end with cylindrical hole interconnect of bell mouth are located this part 11, and the diameter orientation of bell mouth increases gradually towards the direction of keeping away from the cylindrical hole, and the one end of keeping away from the cylindrical hole of bell mouth extends to the terminal surface of bellying 12. So set up, can guarantee the convenience to valve port 103 processing, and can guarantee the regulation precision of the flow of case subassembly 40 and valve port 103 department.
As shown in fig. 1, a first end of the nut seat 20 is provided with a limiting hole 201, a stepped surface is provided in the limiting hole 201, a second end of the guide sleeve 30 penetrates through the limiting hole 201 and is in interference fit with the limiting hole 201, and an end surface of the second end of the guide sleeve 30 is abutted to the stepped surface. In this scheme, spacing hole includes first hole section and the second hole section that communicates in proper order along the axis direction of nut seat 20, and first hole section is close to valve port 103 and sets up, and the diameter of first hole section is greater than the diameter of second hole section, forms the ladder face between first hole section and the second hole section, and the second end of uide bushing 30 is worn to establish in first hole section and with first hole section interference fit. Specifically, when the electronic expansion valve is assembled, first, the first end of the guide sleeve 30 is inserted into the limiting groove 104, and then the first end of the nut seat 20 is sleeved on the second end of the guide sleeve 30, so that the first end and the second end of the guide sleeve 30 are connected to the valve seat 10 and the nut seat 20, respectively. The arrangement of the limiting hole 201 is simple in structure, and convenience in installation of the nut seat 20 and the guide sleeve 30 can be guaranteed.
As shown in fig. 1 and 3, a first communication hole 105 is formed in a side wall of the valve seat 10, the electronic expansion valve further includes a first communication pipe 50 and a second communication pipe 60, the first communication pipe 50 is communicated with the first communication hole 105, and the second communication pipe 60 is sleeved on an outer periphery of the boss 12 and is welded and fixed to the valve seat 10. In this embodiment, the first communication pipe 50 is inserted into the first communication hole 105 and is welded to the valve seat 10. The second communicating pipe 60 is sleeved on the periphery of the protruding portion 12, and the convenience and the sealing performance of the connection of the second communicating pipe 60 and the valve seat 10 can be guaranteed due to the arrangement.
Further, an avoiding groove 111 is formed in an end surface of one end of the body portion 11 connected to the protruding portion 12, the avoiding groove 111 is annularly formed in the outer periphery of the protruding portion 12, the diameter of the avoiding groove 111 is larger than the outer diameter of the second communication pipe 60, and the end portion of the second communication pipe 60 is located in the avoiding groove 111. Dodge groove 111 and the coaxial setting of bellying 12, and dodge and be used for placing in the groove 111 and weld the ring, weld the ring shape and set up in the periphery of bellying 12, weld the ring and dodge groove 111 interference fit. So set up, can fix a position the welding ring, guarantee to weld the stability of ring, guarantee to the welding effect of second communicating pipe 60.
Further, the first communication hole 105 has a space from an inner end surface of the valve seat 10 at an end away from the mounting opening 102 in the axial direction of the valve seat 10. With this arrangement, the first communication hole 105 can be easily processed and the first communication pipe 50 can be easily mounted.
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.
Unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. 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 invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, 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 simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted 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.
For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown 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 terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; 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 if not stated otherwise, the terms have no special meaning, 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 (10)
1. An electronic expansion valve, comprising:
the valve seat (10) is provided with a valve cavity (101) and a mounting port (102) which are communicated with each other, the valve seat (10) is further provided with a valve port (103), the valve port (103) is communicated with the valve cavity (101), and the valve seat (10) is provided with a first limiting structure;
the nut seat (20) is provided with a first end and a second end which are oppositely arranged, the first end of the nut seat (20) is arranged at the mounting opening (102), and the first end of the nut seat (20) is provided with a second limiting structure;
the guide sleeve (30) is arranged in the valve cavity (101), the guide sleeve (30) is provided with a first end and a second end which are oppositely arranged, the peripheral surface of the first end of the guide sleeve (30) is in limit fit with the first limit structure, and the peripheral surface of the second end of the guide sleeve (30) is in limit fit with the second limit structure so as to limit the position of the guide sleeve (30);
the valve core assembly (40) is arranged on the guide sleeve (30) in a penetrating mode, and the valve core assembly (40) is used for adjusting the flow at the valve port (103).
2. The electronic expansion valve according to claim 1, wherein a limiting groove (104) is provided at the bottom of the valve chamber (101), the limiting groove (104) is located at the periphery of the valve port (103), and the first end of the guide sleeve (30) is inserted into the limiting groove (104) and is in limiting fit with the inner wall of the limiting groove (104).
3. The electronic expansion valve according to claim 2, wherein the cross-section of the limiting groove (104) is circular, and the first end of the guide sleeve (30) is in interference fit with the limiting groove (104).
4. An electronic expansion valve according to claim 2, wherein the depth of the limiting groove (104) is greater than or equal to 1.5mm.
5. An electronic expansion valve according to claim 3, wherein the valve port (103) is arranged at the bottom of the retaining groove (104) and is arranged coaxially with the retaining groove (104).
6. An electronic expansion valve according to claim 5, wherein the valve seat (10) comprises a body portion (11) and a protrusion portion (12) integrally connected in an axial direction, and an end of the valve port (103) remote from the limiting groove (104) extends to an end surface of the protrusion portion (12).
7. The electronic expansion valve according to claim 1, wherein the first end of the nut seat (20) is provided with a limiting hole (201), the limiting hole (201) has a stepped surface therein, the second end of the guide sleeve (30) is inserted into the limiting hole (201) and is in interference fit with the limiting hole (201), and the end surface of the second end of the guide sleeve (30) abuts against the stepped surface.
8. The electronic expansion valve according to claim 6, wherein the side wall of the valve seat (10) is provided with a first communication hole (105), the electronic expansion valve further comprises a first communication pipe (50) and a second communication pipe (60), the first communication pipe (50) is communicated with the first communication hole (105), and the second communication pipe (60) is sleeved on the outer periphery of the projection portion (12) and is welded and fixed with the valve seat (10).
9. The electronic expansion valve according to claim 8, wherein an end surface of one end of the body portion (11) connected to the projection portion (12) is provided with an avoidance groove (111), the avoidance groove (111) is annularly provided at an outer periphery of the projection portion (12), a diameter of the avoidance groove (111) is larger than an outer diameter of the second communication pipe (60), and an end portion of the second communication pipe (60) is located in the avoidance groove (111).
10. An electronic expansion valve according to claim 8, wherein the first communication hole (105) is spaced from an inner end surface of the valve seat (10) at an end remote from the mounting opening (102) in an axial direction of the valve seat (10).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222918868.2U CN218523044U (en) | 2022-10-31 | 2022-10-31 | Electronic expansion valve |
| PCT/CN2023/128836 WO2024094029A1 (en) | 2022-10-31 | 2023-10-31 | Electronic expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222918868.2U CN218523044U (en) | 2022-10-31 | 2022-10-31 | Electronic expansion valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218523044U true CN218523044U (en) | 2023-02-24 |
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ID=85250130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222918868.2U Active CN218523044U (en) | 2022-10-31 | 2022-10-31 | Electronic expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218523044U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024094029A1 (en) * | 2022-10-31 | 2024-05-10 | 浙江盾安人工环境股份有限公司 | Electronic expansion valve |
-
2022
- 2022-10-31 CN CN202222918868.2U patent/CN218523044U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024094029A1 (en) * | 2022-10-31 | 2024-05-10 | 浙江盾安人工环境股份有限公司 | Electronic expansion valve |
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