Electronic expansion valve

Abstract

An electronic expansion valve (100). The electronic expansion valve (100) comprises a valve seat portion (10) and a connecting pipe (20), the valve seat portion (10) being provided with a valve port (101), and the connecting pipe (20) being connected to the valve seat portion (10) and being in communication with the valve port (101). A capillary channel (201) is formed in the connecting pipe (20), the capillary channel (201) has an inner diameter D1, and the valve port (101) has an inner diameter D, satisfying 1≤D1 / D≤2.5.

Description

Electronic expansion valve

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application with the application number 202421796141.4, the title of which is "Electronic expansion valve", filed on July 26, 2024, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of air conditioning parts, in particular to an electronic expansion valve. BACKGROUND

[0004] The electronic expansion valve often plays a role of throttling, pressure reduction and flow regulation in an air conditioning system, and has the advantages of large flow control range, sensitive response and fine regulation.

[0005] At present, the valve port length of the electronic expansion valve is usually short, and the channels on both sides of the valve port flow are wider than the width of the valve port. After passing through the valve port, the refrigerant will expand rapidly, which makes the refrigerant flow speed increase instantaneously. Moreover, since the refrigerant is in a gas-liquid two-phase state after throttling through the valve port, the rapid flow of the refrigerant will cause the internal bubbles to break sharply, thereby generating a large flow noise, which greatly affects the user's experience. SUMMARY

[0006] According to various embodiments of the present application, an electronic expansion valve is provided.

[0007] The present application provides an electronic expansion valve, which comprises a valve seat part and a connecting pipe, the valve seat part is provided with a valve port, and the connecting pipe is connected to the valve seat part and communicates with the valve port; wherein a capillary channel is arranged in the connecting pipe, the inner diameter of the capillary channel is D1, the inner diameter of the valve port is D, and 1≤D1 / D≤2.5 is satisfied.

[0008] In one of the embodiments, the length of the capillary channel is h, and h≥3D is satisfied.

[0009] In one of the embodiments, the connecting pipe forms the capillary channel.

[0010] In one of the embodiments, the connecting pipe forms the capillary channel, and the inner diameter of the capillary channel is less than or equal to the inner diameter of other parts of the connecting pipe.

[0011] In one of the embodiments, at least part of the connecting pipe is contracted in the radial direction of the connecting pipe to form the capillary channel.

[0012] In one of the embodiments, the capillary channel is arranged at one end of the connecting pipe close to the valve port, or the capillary channel is arranged spaced apart from the valve port.

[0013] In one of the embodiments, the connecting pipe comprises a capillary pipe section and a joint section, one end of the capillary pipe section is connected to the valve seat part, and the other end is connected to the joint section; at least part of the capillary pipe section forms the capillary channel.

[0014] In one of the embodiments, the capillary pipe section is a stainless steel part, and / or the joint section is a copper part.

[0015] In one of the embodiments, the electronic expansion valve further comprises a communication pipe, the communication pipe is connected to the valve seat part, and the communication pipe communicates with the connecting pipe through the valve port; wherein the communication pipe is provided with the capillary channel or is not provided with the capillary channel.

[0016] In one of the embodiments, the valve seat part is provided with a first assembly hole and a second assembly hole which communicate with the valve port, the first assembly hole is arranged at the end of the valve seat part, and the second assembly hole is arranged at the circumferential side of the valve seat part; wherein one of the communication pipe and the connecting pipe is inserted into and connected to the first assembly hole, and the other is inserted into and connected to the second assembly hole.

[0017] In one of the embodiments, the valve seat part comprises a main valve seat and a secondary valve seat which are connected to each other; the main valve seat is provided with a mounting hole, and the secondary valve seat is mounted in the mounting hole, and at least part of the secondary valve seat protrudes from the main valve seat, wherein the valve port and the first assembly hole are arranged in the secondary valve seat, and the second assembly hole is arranged in the main valve seat; or the main valve seat is formed with a mounting groove, and the secondary valve seat is mounted in the mounting groove, wherein the valve port is arranged in the secondary valve seat, the first assembly hole is arranged in the secondary valve seat and / or the main valve seat, and the second assembly hole is arranged in the main valve seat; or the secondary valve seat is sleeved on one end of the main valve seat, wherein the first assembly hole is arranged in the secondary valve seat, and the valve port and the second assembly hole are arranged in the main valve seat.

[0018] In one of the embodiments, the capillary channel is arranged close to the valve seat part.

[0019] In one of the embodiments, the valve seat part comprises a main valve seat and a secondary valve seat which are connected to each other, the main valve seat is provided with a mounting hole, the secondary valve seat is mounted in the mounting hole, and at least part of the secondary valve seat protrudes from the main valve seat; wherein the connecting pipe or the communication pipe is sleeved on the part of the secondary valve seat which protrudes from the main valve seat.

[0020] In one of the embodiments, the capillary channel is arranged separately from the valve seat part.

[0021] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0022] To describe and describe the embodiments and / or examples of the inventions disclosed herein better, reference can be made to one or more accompanying drawings. Additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the presently described embodiments and / or examples, and the best mode presently understood of these inventions.

[0023] Fig. 1 is a partial cross-sectional view of an electronic expansion valve according to an embodiment of the present application.

[0024] Fig. 2 is a partial cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0025] Fig. 3 is a partial cross-sectional view of an electronic expansion valve according to still another embodiment of the present application.

[0026] Fig. 4 is a partial cross-sectional view of an electronic expansion valve according to yet another embodiment of the present application.

[0027] The symbols in the drawings represent the following meanings: 100, electronic expansion valve; 10, valve seat portion; 101, valve port; 102, first fitting hole; 103, second fitting hole; 104, mounting hole; 105, mounting groove; 11, main valve seat; 12, sub valve seat; 20, connection pipe; 201, capillary passage; 21, capillary pipe section; 22, joint section; 30, communication pipe. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and that the present application can be implemented in many different ways, from those described herein, by one skilled in the art. Therefore, the particular embodiments disclosed below are not intended to limit the scope of the present application, but merely to illustrate it.

[0029] It should be noted that when a component is referred to as being "on" or "disposed on" another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the description of the specification are used for illustrative purposes only and are not intended to be limiting.

[0030] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, a feature defined with "first", "second", etc. can explicitly or implicitly include at least one of the feature. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the "on", "under" of the first feature to the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "over", "above" and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by a person skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0033] Electronic expansion valves often play the role of throttling and regulating flow in air conditioning systems, and have the advantages of large flow control range, sensitive response, fine adjustment, etc.

[0034] At present, the valve port length of the electronic expansion valve is usually short, and the channels on both sides of the valve port are wider than the width of the valve port. After passing through the valve port, the refrigerant will expand rapidly, causing the flow rate of the refrigerant to increase instantaneously. Moreover, since the refrigerant is in a gas-liquid two-phase state after throttling through the valve port, the rapid flow of the refrigerant will cause the internal bubbles to burst sharply, thereby generating a large flow noise, which greatly affects the user's experience.

[0035] Please refer to FIG. 1-FIG. 4, in order to solve the problem that the refrigerant in the existing electronic expansion valve structure will generate a large flow noise after flowing through the valve port, the present application provides an electronic expansion valve 100. The electronic expansion valve 100 includes a valve seat part 10 and a connecting pipe 20, the valve seat part 10 is provided with a valve port 101, and the connecting pipe 20 is connected to the valve seat part 10 and communicates with the valve port 101. Among them, the connecting pipe 20 is provided with a capillary channel 201, the inner diameter of the capillary channel 201 is D1, the inner diameter of the valve port 101 is D, and 1≤D1 / D≤2.5 is satisfied.

[0036] It can be understood that, by arranging the capillary passage 201 in the connecting pipe 20, the high-speed refrigerant generated by throttling through the valve port 101 can be slowed down when flowing to the connecting pipe 20, because the inner diameter of the capillary passage 201 is small, and the capillary passage 201 can generate a large flow resistance to the refrigerant, thereby slowing down the flow rate of the refrigerant. The reduction of the flow rate of the refrigerant can effectively reduce the breaking frequency of the bubbles in the refrigerant, thereby greatly reducing the noise of the refrigerant. In addition, the inner diameter D1 of the capillary passage 201 and the inner diameter D of the valve port 101 are arranged as 1≤D1 / D≤2.5, which further ensures the speed reduction effect of the capillary passage 201 on the refrigerant, so that the noise of the refrigerant can be further reduced.

[0037] Specifically, when D1 / D>2.5, the inner diameter of the capillary passage 201 is large, and the flow resistance generated by the capillary passage 201 to the refrigerant is small, and the bubbles in the refrigerant have a large risk of breaking. When D1 / D<1, the inner diameter of the capillary passage 201 is small, and the capillary passage 201 generates a large flow resistance to the refrigerant, which is not conducive to the smooth flow of the refrigerant and subsequent heat exchange. For example, D1 / D can be 1, 1.5, 2 or 2.5, and the like, which are not listed one by one.

[0038] Further, in an embodiment, the length of the capillary passage 201 is h, and h≥3D is satisfied. In this way, by lengthening the length of the capillary passage 201, a better speed reduction effect can be achieved on the refrigerant.

[0039] In an embodiment, the connecting pipe 20 forms the capillary passage 201, that is, the connecting pipe 20 is configured as a capillary structure as a whole, and the structure is simpler.

[0040] In an embodiment, part of the connecting pipe 20 forms the capillary passage 201, and the inner diameter of the capillary passage 201 is less than or equal to the inner diameter of other parts of the connecting pipe 20. In this way, the capillary passage 201 can also be formed to slow down the refrigerant.

[0041] Specifically, in an embodiment, as shown in FIGS. 1-3, at least part of the connecting pipe 20 is contracted along the radial direction of the connecting pipe 20 to form the capillary passage 201. That is, in this embodiment, the capillary passage 201 is formed by directly contracting the connecting pipe 20, which is simple to form and can greatly reduce the processing difficulty of the capillary passage 201. Compared with the related art, by arranging a throttling device in the connecting pipe 20, the structure of the present embodiment greatly reduces the manufacturing cost.

[0042] The capillary passage 201 can be arranged at one end of the connecting pipe 20 close to the valve port 101, or the capillary passage 201 can be arranged separately from the valve port 101. It can be understood that the position of the capillary passage 201 on the connecting pipe 20 can be reasonably arranged according to actual needs, as long as the same effect of reducing the flow rate of the refrigerant can be achieved.

[0043] In another embodiment, as shown in FIG. 4, the connecting pipe 20 comprises a capillary pipe segment 21 and a joint segment 22, the capillary pipe segment 21 is connected to the valve seat portion 10 at one end and connected to the joint segment 22 at the other end, and the joint segment 22 is connected to the external pipe. At least part of the capillary pipe segment 21 forms a capillary passage 201.

[0044] In this way, the capillary passage 201 formed by the capillary pipe segment 21 can also reduce the flow rate of the refrigerant, and the joint segment 22 facilitates the connection of the capillary pipe segment 21 to the external pipe, which is conducive to improving the overall processing efficiency.

[0045] Generally, the connecting pipe 20 is welded to the valve seat portion 10 and the external pipe. In order to facilitate the welding between the connecting pipe 20 and the valve seat portion 10, the capillary pipe segment 21 and the valve seat portion 10 can be made of stainless steel. By using the same material for processing, the welding between the two is simpler, and the cost of stainless steel is relatively low, which can greatly reduce the cost of the electronic expansion valve 100. In addition, since the pipe in the air conditioner is usually a copper pipe, in order to facilitate the welding of the connecting pipe 20 and the external air conditioner pipe, in some embodiments, the joint segment 22 is made of copper.

[0046] Further, when the connecting pipe 20 is a whole structure, the connecting pipe 20 can also be made of copper as a whole to reduce the connection difficulty of the connecting pipe 20 and the external pipe.

[0047] In an embodiment, as shown in FIGS. 1-4, the electronic expansion valve 100 further comprises a communication pipe 30, the communication pipe 30 is connected to the valve seat portion 10, and the communication pipe 30 is connected to the connecting pipe 20 through the valve port 101. The communication pipe 30 is provided with a capillary passage 201 or without a capillary passage 201.

[0048] Generally, the electronic expansion valve 100 can realize the bidirectional flow of the refrigerant. At this time, the capillary passage 201 can be arranged in the communication pipe 30 to achieve the speed reduction of the refrigerant when flowing in and out. In some embodiments, when the electronic expansion valve 100 is used as a one-way valve, the connecting pipe 20 is arranged behind the valve port 101. At this time, since the capillary passage 201 in the single connecting pipe 20 can achieve noise reduction, the capillary passage 201 can not be arranged in the communication pipe 30, so that the cost of the electronic expansion valve 100 is lower. Of course, in other embodiments, the connecting pipe 20 can also be arranged in front of the valve port 101, which can be reasonably arranged according to actual needs.

[0049] Specifically, the connecting pipe 20 and the communicating pipe 30 can both serve as the inlet and outlet of the refrigerant, and the application specifically takes the connecting pipe 20 as the refrigerant outlet and the communicating pipe 30 as the refrigerant inlet, and takes the communicating pipe 30 provided with the capillary passage 201 as an example for illustration. Since the connecting pipe 20 and the communicating pipe 30 are both provided with the capillary passage 201, the refrigerant can be slowed down in the corresponding capillary passage 201 of the communicating pipe 30 when flowing from the communicating pipe 30 to the valve port 101, and then the refrigerant can be slowed down again in the capillary passage 201 of the connecting pipe 20 when flowing from the valve port 101 to the connecting pipe 20, so as to further improve the noise reduction effect of the refrigerant.

[0050] In addition, when the communicating pipe 30 serves as the refrigerant outlet and the connecting pipe 20 serves as the refrigerant inlet, the same principle applies, which will not be described herein.

[0051] It should be noted that the structure of the communicating pipe 30 can be the same as or different from that of the connecting pipe 20. For example, the connecting pipe 20 can be designed as a whole, and the communicating pipe 30 can be designed as a split structure composed of the capillary pipe segment 21 and the joint segment 22, which will not be limited herein.

[0052] In an embodiment, as shown in FIG. 1, the valve seat portion 10 is provided with a first assembly hole 102 and a second assembly hole 103 in communication with the valve port 101, the first assembly hole 102 is arranged at the end of the valve seat portion 10, and the second assembly hole 103 is arranged at the side of the valve seat portion 10. One of the communicating pipe 30 and the connecting pipe 20 is inserted and connected to the first assembly hole 102, and the other is inserted and connected to the second assembly hole 103.

[0053] Here, the valve seat portion 10 can be a whole structure or a split structure. When the valve seat portion 10 is a whole structure, the valve port 101 and the first assembly hole 102 can be directly arranged on the valve seat portion 10, which can reduce the assembly process of the valve seat portion 10 and improve the assembly efficiency. At the same time, the valve seat portion 10 has a small size, which can reduce the material cost of the valve seat portion 10.

[0054] If the valve seat portion 10 is a split structure, for example, in an embodiment, the valve seat portion 10 can include a main valve seat 11 and a secondary valve seat 12 connected to each other, so as to facilitate the machining of the valve port 101 and the like and reduce the machining difficulty.

[0055] The connection between the main valve seat 11 and the secondary valve seat 12 can be connected by but not limited to the following ways:

[0056] In an embodiment, as shown in FIGS. 2-4, the main valve seat 11 is provided with a mounting hole 104, the secondary valve seat 12 is mounted in the mounting hole 104, and at least part of the secondary valve seat 12 protrudes from the main valve seat 11. The valve port 101 and the first assembly hole 102 are arranged on the secondary valve seat 12, and the second assembly hole 103 is arranged on the main valve seat 11.

[0057] In another embodiment, the main valve seat 11 is formed with a mounting groove 105, and the auxiliary valve seat 12 is mounted in the mounting groove, wherein the valve port 101 is formed in the auxiliary valve seat 12, the first assembly hole 102 can be formed in the auxiliary valve seat 12 and / or the main valve seat 11, and the second assembly hole 103 is formed in the main valve seat 11.

[0058] In yet another embodiment, the auxiliary valve seat 12 is sleeved on one end of the main valve seat 11, wherein the first assembly hole 102 is formed in the auxiliary valve seat 12, and the valve port 101 and the second assembly hole 103 are formed in the main valve seat 11.

[0059] In order to reduce the size of the valve seat part 10 and reduce the cost, in some embodiments, when the connecting pipe 20 is connected to the first assembly hole 102, the capillary passage 201 is arranged close to the valve seat part 10, that is, at least part of the capillary passage 201 is arranged at the end of the connecting pipe 20 close to the first assembly hole 102.

[0060] It should be noted that, in some embodiments, when the communicating pipe 30 is connected to the first assembly hole 102 and the capillary passage 201 is arranged on the communicating pipe 30, at least part of the capillary passage 201 is also arranged at the end of the communicating pipe 30 close to the first assembly hole 102.

[0061] Further, when at least part of the auxiliary valve seat 12 protrudes from the main valve seat 11, the connecting pipe 20 or the communicating pipe 30 can be sleeved on the part of the auxiliary valve seat 12 protruding from the main valve seat 11, so as to realize the connection with the valve seat part 10. At this time, the capillary passage 201 can be arranged apart from the valve seat part 10, so as to facilitate the connection of the two.

[0062] In addition, in the connecting pipe 20 or the communicating pipe 30 connected to the second assembly hole 103, the capillary passage 201 can be arranged at the end close to the second assembly hole 103 or arranged apart from the valve seat part 10 according to actual needs, so as to reduce the cost or improve the connection strength.

[0063] The technical features of the above-mentioned embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0064] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An electronic expansion valve characterized by, The valve seat part is provided with a valve port, and the connecting pipe is connected to the valve seat part and communicates with the valve port; The connecting pipe is provided with a capillary channel, the inner diameter of the capillary channel is D1, the inner diameter of the valve port is D, and 1≤D1 / D≤2.

5.

2. The electronic expansion valve according to claim 1, wherein, The length of the capillary channel is h, and h≥3D.

3. The electronic expansion valve of claim 1, wherein, The connecting pipe forms the capillary channel.

4. The electronic expansion valve of claim 1, wherein, Part of the connecting pipe forms the capillary channel, and the inner diameter of the capillary channel is less than or equal to the inner diameter of other parts of the connecting pipe.

5. The electronic expansion valve of claim 4, wherein, The at least part of the connecting pipe is radially contracted to form the capillary channel.

6. The electronic expansion valve of claim 5, wherein, The capillary channel is arranged at one end of the connecting pipe close to the valve port, or the capillary channel is arranged at a position spaced from the valve port.

7. The electronic expansion valve of claim 4, wherein, The connecting pipe comprises a capillary pipe segment and a joint segment arranged separately, one end of the capillary pipe segment is connected to the valve seat part, and the other end is connected to the joint segment. The at least part of the capillary pipe segment forms the capillary channel.

8. The electronic expansion valve of claim 7, wherein, The capillary pipe segment is a stainless steel part, and / or the joint segment is a copper part.

9. The electronic expansion valve according to any one of claims 1-8, wherein, The electronic expansion valve further comprises a communication pipe connected to the valve seat part, and the communication pipe communicates with the connecting pipe through the valve port. The communication pipe is provided with the capillary channel or is not provided with the capillary channel.

10. The electronic expansion valve of claim 9, wherein, The valve seat part is provided with a first assembly hole and a second assembly hole communicating with the valve port, the first assembly hole is arranged at the end of the valve seat part, and the second assembly hole is arranged at the circumferential side of the valve seat part. One of the communication pipe and the connecting pipe is inserted into and connected to the first assembly hole, and the other is inserted into and connected to the second assembly hole.

11. The electronic expansion valve of claim 10, wherein, The valve seat part comprises a main valve seat and a secondary valve seat connected to each other. The main valve seat is provided with a mounting hole, the secondary valve seat is mounted in the mounting hole, and at least part of the secondary valve seat protrudes from the main valve seat, wherein the valve port and the first assembly hole are arranged in the secondary valve seat, and the second assembly hole is arranged in the main valve seat. Alternatively, the main valve seat is formed with a mounting groove, and the secondary valve seat is mounted in the mounting groove, wherein the valve port is arranged in the secondary valve seat, the first assembly hole is arranged in the secondary valve seat and / or the main valve seat, and the second assembly hole is arranged in the main valve seat. Alternatively, the secondary valve seat is sleeved on one end of the main valve seat, wherein the first assembly hole is arranged in the secondary valve seat, and the valve port and the second assembly hole are arranged in the main valve seat.

12. The electronic expansion valve of claim 10, wherein, The capillary channel is arranged close to the valve seat part.

13. The electronic expansion valve of claim 9, wherein, The valve seat part comprises a main valve seat and a secondary valve seat connected to each other, the main valve seat is provided with a mounting hole, the secondary valve seat is mounted in the mounting hole, and at least part of the secondary valve seat protrudes from the main valve seat. The connecting pipe or the communication pipe is sleeved on the part of the secondary valve seat protruding from the main valve seat.

14. The electronic expansion valve of claim 13, wherein, The capillary channel is arranged at a position spaced from the valve seat part.

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