Electronic expansion valve

Abstract

The invention provides an electronic expansion valve which is characterized in that the electronic expansion valve comprises a valve body component, the valve body component comprises a valve port part, the valve port part comprises a first wall part, a second wall part and a third wall part, the electronic expansion valve comprises a first valve cavity and a second valve cavity, the first wall part is closer to the first valve cavity relative to the second wall part, and the third wall part is closer to the second valve cavity relative to the second wall part. The third wall portion is closer to the second valve cavity relative to the second wall portion, the inner diameter D1 of the first wall portion is smaller than the inner diameter D2 of the third wall portion, and the height H1 of the first wall portion is larger than or equal to 0.08 mm and smaller than or equal to 0.3 mm. According to the technical scheme, the first wall part, the second wall part and the third wall part are arranged on the valve port part, the inner diameter of the first wall part is smaller than that of the third wall part, and the height H1 of the first wall part is larger than or equal to 0.08 mm and smaller than or equal to 0.3 mm, so that when the refrigerant flows through, the rectification effect on the refrigerant is achieved, the pressure and the flowing state of the refrigerant are more stable, and the service life of the refrigerant is prolonged. And the possibility of generating howling noise is reduced.

Description

Technical Field

[0001] This application relates to the field of refrigeration control technology, and in particular to an electronic expansion valve. Background Technology

[0002] Electronic expansion valves, as throttling elements, have advantages such as high adjustment accuracy and precise temperature control, and are widely used in air conditioning, refrigeration and other fields.

[0003] During operation, when the refrigerant flows through the throttling section of the electronic expansion valve, the refrigerant pressure and flow rate change drastically due to the rapid changes in the throttling area and shape, which may cause refrigerant noise. In applications such as household air conditioners, the significant noise from electronic expansion valves can negatively impact the experience for people in the environment. Therefore, improving the noise level of electronic expansion valves in application has become a key focus of the industry. Summary of the Invention

[0004] The purpose of this application is to provide an electronic expansion valve that, through structural optimization, can reduce the noise caused by refrigerant flow and improve the noise level of the electronic expansion valve in application.

[0005] To solve the above-mentioned technical problems, this application provides an electronic expansion valve, characterized in that it includes a valve body component, the valve body component includes a valve port portion, the valve port portion includes a first wall portion, a second wall portion, and a third wall portion, the electronic expansion valve includes a first valve chamber and a second valve chamber, the first wall portion is closer to the first valve chamber than the second wall portion, the third wall portion is closer to the second valve chamber than the second wall portion, the inner diameter D1 of the first wall portion is smaller than the inner diameter D2 of the third wall portion, and the height H1 of the first wall portion satisfies: 0.08mm≤H1≤0.3mm.

[0006] In the above technical solution, by setting a first wall, a second wall, and a third wall at the valve port, and making the inner diameter of the first wall smaller than the inner diameter of the third wall, and taking the height H1 of the first wall as 0.08mm≤H1≤0.3mm, it is beneficial to rectify the refrigerant when it flows through, making the pressure and flow state of the refrigerant more stable and reducing the possibility of generating howling noise.

[0007] Based on the above technical solution, further improvements can be made, such as setting a silencing component below the valve port. The silencing component includes two or more porous parts, and at least part of the silencing component is located in the second valve chamber. In this way, when the rectified refrigerant flows through the silencing component, the noise can be further reduced. Attached Figure Description

[0008] Figure 1 This is a cross-sectional schematic diagram of the electronic expansion valve in the first embodiment provided in this application;

[0009] Figure 2 for Figure 1 Enlarged view of the middle valve body and silencer components;

[0010] Figure 3 for Figure 2 Enlarged schematic diagram of the middle section (I);

[0011] Figure 4 for Figure 1 A magnified view of a portion of the image;

[0012] Figure 5 for Figure 1 Cross-sectional schematic diagram of the middle noise reduction component;

[0013] Figure 6 for Figure 5 Top view;

[0014] Figure 7 for Figure 5 A bottom view;

[0015] Figure 8 for Figure 5 A cross-sectional schematic diagram of the first porous component;

[0016] Figure 9 for Figure 5 Schematic diagram of the structure of the second porous component;

[0017] Figure 10 This is a cross-sectional schematic diagram of the noise-reducing component in the second embodiment provided in this application;

[0018] Figure 11 for Figure 10 Top view;

[0019] Figure 12 for Figure 10 A bottom view;

[0020] Figure 13 This is a schematic diagram of the structure of the noise reduction component in the third embodiment provided in this application;

[0021] Figure 14 for Figure 13 A cross-sectional schematic diagram of the noise reduction component shown;

[0022] Figure 15 for Figure 13 Schematic diagram of the middle sleeve;

[0023] Figure 16 for Figure 13 Cross-sectional schematic diagram of the middle partition;

[0024] Figure 17 for Figure 16 The bottom view of the partition shown. Detailed Implementation

[0025] The technical solution of this application will now be described with reference to the accompanying drawings.

[0026] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the electronic expansion valve structure according to the first embodiment provided in this application.

[0027] refer to Figure 1 Understandably, the electronic expansion valve provided in this application embodiment includes a valve body component 10, a first connecting pipe 31, a second connecting pipe 32, a drive component 40, and a valve needle 50.

[0028] The valve body component 10 includes a valve port portion 11 with a valve port 11a. The valve body component 10 also includes a first valve chamber 12 and a second valve chamber 13. The first valve chamber 12 is located above the second valve chamber 13 and can communicate with the second valve chamber 13 through the valve port 11a; that is, the first valve chamber 12 is located above the valve port 11a, and the second valve chamber 13 is located below the valve port 11a. The valve body component 10 is provided with a first interface portion 14 and a second interface portion 15. A first connecting pipe 31 is fixedly connected to the first interface portion 14, and a second connecting pipe 32 is fixedly connected to the second interface portion 15. Thus, the space inside the first connecting pipe 31 communicates with the second valve chamber 13, and the space inside the second connecting pipe 32 communicates with the first valve chamber 12. The first interface portion 14 is located below the valve body component 10, and the second interface portion 15 is located on the side of the valve body component.

[0029] The drive component 40 is used to drive the valve needle 50 to move up and down along the axial direction of the valve body component 10 to close or open the valve port 11a. Figure 1 In the illustrated perspective, the axial direction refers to the vertical direction. Thus, when valve port 11a is open, refrigerant flowing from the first connecting pipe 31 into the second valve chamber 13 can enter the first valve chamber 12 through valve port 11a and flow out through the second connecting pipe 32. Alternatively, refrigerant flowing from the second connecting pipe 32 into the first valve chamber 12 can enter the second valve chamber 13 through valve port 11a and flow out through the first connecting pipe 31. It can be understood that the electronic expansion valve can be configured as a valve that allows flow in both directions or as a valve that allows only unidirectional flow, depending on the application requirements.

[0030] Typically, a transmission component is also provided between the drive component 40 and the valve needle 50. In this application, the specific structure of the drive component 40 and the transmission component are not considered core inventive points and will not be detailed here, only briefly described: The rotor component 41 rotates under the electromagnetic force generated by the electromagnetic coil (not shown in the figure), and the valve shaft 43 rotates synchronously through the connecting plate 42 fixedly connected to the rotor component 41 and the valve shaft 43. The nut 44 is fixedly connected to the valve body component 10 and is provided with an internal thread. The valve shaft 43 is correspondingly provided with an external thread. Through the cooperation of the internal and external threads, the valve shaft 43 undergoes axial displacement while rotating. The valve needle 50 and the valve shaft 43 are connected by a floating connection, meaning that the valve needle 50 can drive the valve needle to undergo axial displacement, and the valve needle 50 can also undergo a relatively small relative axial displacement relative to the valve shaft 43. Thus, while the valve needle 50 undergoes axial displacement, it approaches, abuts against, or moves away from the valve port 11a, thereby achieving the purpose of regulating the refrigerant flow rate through the valve port 11a. Figure 1 The specific structure of an electronic expansion valve is only provided as an example. In other embodiments, the transmission connection between the drive component 40 and the valve needle 50 can be changed as needed, or other existing transmission designs can be used, and are not limited to those shown in the figure.

[0031] The valve port portion 11 includes a first wall portion 112, a second wall portion 113, and a third wall portion 114, wherein the first wall portion 112 is located at the upper part of the valve port portion 11, such as... Figure 3 As shown. The first wall portion 112 can be a cylindrical inner wall, that is, a circular cross-section, and... Figure 3 The view shown depicts a straight section. The height of the first wall portion 112 is H1, which can range from 0.08mm to 0.3mm. This height setting of the first wall portion 112 helps reduce the possibility of whistling noise when the refrigerant flows through it. The applicant found in experiments that the whistling noise was significantly reduced after adopting the above structure. The valve port 11a is formed at the top of the first wall portion 112. In actual production, the edge of the valve port 11a can be rounded. The third wall portion 114 is located below the valve port portion 11. The third wall portion 114 can also be a cylindrical inner wall, i.e., a circular cross-section, and... Figure 3The view shown depicts a relatively long straight section. The space defined by the third wall portion 114 communicates with the second valve chamber 13 to allow refrigerant flow. The inner diameter D2 of the third wall portion 114 is larger than the inner diameter D1 of the first wall portion 112, and the relationship between D1 and D2 satisfies: 1.05D1≤D2≤2.5D2. Furthermore, depending on the inner diameter of the first wall portion, the larger the inner diameter of the first wall portion, the smaller the multiple of the inner diameter of the third wall portion relative to the inner diameter of the first wall portion. For example, in a specific embodiment, D1 can be set to approximately 2.0 mm, then D2 can be set to 2.68 mm, with D2 having a smaller multiple relative to D1; while if D1 is set to approximately 1.3 mm, then D2 can be set to approximately 2.6 mm, with D2 having a larger multiple relative to D1. This structural design, when the refrigerant flows in from the valve port 11a, can rectify the refrigerant through the change in the flow channel diameter, making the refrigerant pressure and flow state more stable, which helps to reduce refrigerant noise. Furthermore, the refrigerant, with its more stable flow, becomes even more effective at reducing noise when passing through the silencing component 20 described below.

[0032] The height H2 of the third wall 114 is set to be much greater than the height H1 of the first wall. Specifically, H3 can be set to H3≥6H1 and H3≤8mm. This structure can provide more space for the refrigerant to flow. When the refrigerant flows into the space defined by the third wall, it is beneficial to further rectify the flow and make the refrigerant flow more stable.

[0033] The second wall portion 113 is located between the first wall portion 112 and the third wall portion 114. In other words, the first wall portion 112 is closer to the first valve chamber 12 than the second wall portion 113, and the third wall portion 114 is closer to the second valve chamber than the second wall portion 113. At least a portion of the second wall portion 113 includes a tapered segment 1131. The tapered angle α of the tapered segment can be set to 50°–70°, and in one specific embodiment, the tapered angle α can be set to approximately 60°. The second wall portion 113 can be entirely tapered, or only partially tapered. For ease of processing and to ensure the consistency of the height H1 of the first wall portion 112, the tapered segment 1131 can be positioned on the side away from the first wall portion 112. Thus, the tapered segment 1131 and the first wall portion 112 can be transitioned through a transition portion 1132. The height H2 of the tapered segment 1131 can be set to 0.2 mm–0.6 mm.

[0034] The electronic expansion valve provided in this embodiment also includes a silencing component 20, at least a portion of which is located in the second valve cavity 13, and at least a portion of the outer peripheral wall of the silencing component 20 contacts the cavity wall of the second valve cavity 13. The silencing component 20 includes two or more porous elements, each arranged axially along the valve body component 10. The electronic expansion valve includes a flow channel, at least a portion of which penetrates at least one porous element. The flow channel connects the valve port 11a and the first connecting pipe 31, and the minimum effective flow area of ​​the flow channel is greater than the maximum equivalent flow area of ​​the valve port 11a. Here, a porous element refers to a component with multiple micropore structures inside, the pore diameter of which is smaller than the diameter of the valve port 11a. The specific pore diameter value can be determined according to actual needs, and no specific numerical limit is specified here.

[0035] The minimum effective flow area of ​​the flow channel refers to the minimum area in the cross-sectional area of ​​the flow channel that allows fluid to pass through. The cross-section of the flow channel is a section perpendicular to the axis of the flow channel. The maximum equivalent flow area of ​​valve port 11a refers to the maximum flow area of ​​fluid when the electronic expansion valve is in the fully open state and the fluid flows through valve port 11a.

[0036] As described above, the silencing component 20 is placed inside the second valve chamber 13. In application, during the process of refrigerant flowing from the first pipe 31 to the second pipe 32, or from the second pipe 32 to the first pipe 31, most of the refrigerant will pass through the silencing component 20. The air bubbles in the refrigerant will be dispersed and refined by the porous structure of the component, making the gas phase and liquid phase distribution in the refrigerant more uniform. This improves the fluid state of the refrigerant when it enters the throttling section (i.e., valve port 11a) or after the refrigerant is throttled, thereby making the sound performance of the refrigerant before and after throttling more moderate and the noise is significantly reduced.

[0037] Meanwhile, the electronic expansion valve is also equipped with the aforementioned flow channel, and the silencing component 20 is equipped with two or more porous components. After one porous component is blocked, the refrigerant can achieve the purpose of noise reduction through other porous components, which can extend the effective working time of the silencing component 20. If all the porous components are blocked by impurities, the refrigerant can still flow through the flow channel to avoid functional failure caused by the blockage of the silencing component 20.

[0038] Setting the minimum effective flow area of ​​the flow channel to be greater than the maximum equivalent flow area of ​​the valve port 11a can prevent the opening adjustment of the valve port 11a from being inconsistent with the design when the refrigerant can only flow through the flow channel, thus affecting the working performance of the electronic expansion valve.

[0039] Therefore, the electronic expansion valve provided in this application embodiment can reduce the noise caused by refrigerant flow and improve noise comfort while ensuring its reliable and effective operation.

[0040] In practical applications, the silencing component 20 can be configured in various ways to achieve the above functions. The following describes in detail the specific structure of the silencing component 20 and its cooperation with the valve body component 10 using several specific embodiments.

[0041] In the following embodiments, the silencing component 20 is provided with two porous components as an example for illustrative purposes. Those skilled in the art can provide more than three porous components based on this, and the relevant structures can be adapted to each embodiment. For ease of understanding and description, the two porous components are referred to as the first porous component and the second porous component in each embodiment.

[0042] First embodiment:

[0043] Please refer to Figures 4 to 5 , Figure 4 for Figure 3 A magnified view of part I in the middle; Figure 5 for Figure 1 Cross-sectional schematic diagram of the middle noise reduction component.

[0044] In this embodiment, the silencing component 20 is cylindrical in shape, and its outer peripheral wall is sealed to the cavity wall of the second valve chamber 13. That is, the silencing component 20 and the second valve chamber 13 are sealed to each other in the circumferential direction. In this way, the refrigerant can only flow through the silencing component 20 between the first pipe 31 and the second pipe 32. At this time, a flow channel is formed inside the silencing component 20.

[0045] like Figure 4 As shown, the electronic expansion valve has a flow channel S1. The arrow in the figure shows the flow direction of the refrigerant in the flow channel S1, with the first connecting pipe 31 as the refrigerant outlet as an example.

[0046] The silencing component 20 includes a first porous component 21 and a second porous component 22. The first porous component 21 is located above the second porous component 22, that is, the first porous component 21 is relatively close to the valve port 11a, and the second porous component 22 is relatively close to the first interface 14. Both porous components are provided with flow channels. The first porous component 21 has a first flow channel 211, and the second porous component 22 has a second flow channel 221. The first flow channel 211 and the second flow channel 221 are both part of the flow channel S1. It should be understood that the equivalent diameter of the first flow channel 211 and the second flow channel 221 is larger than the pore size of the microporous structure of the porous component, and the flow area of ​​the first flow channel 211 and the second flow channel 221 is larger than the maximum equivalent flow area of ​​the valve port 11a. In the projection plane perpendicular to the axial direction of the valve body component 10, the projection of the first flow channel 211 does not coincide with the projection of the second flow channel 221. In other words, the first flow channel 211 and the second flow channel 221 are not in axial position on the valve body component 10. This can prevent the refrigerant from flowing directly into the second flow channel 221 after flowing through the first flow channel 211, or from flowing directly into the first flow channel 211 after flowing out of the second flow channel 221. This avoids the phenomenon that the refrigerant flows out without changing its state through the microporous structure of the porous component.

[0047] A first chamber 13a is provided between the first porous component 21 and the second porous component 22. This prevents throttling of the refrigerant as it flows through the first porous component 21 and the second porous component 22. At the same time, the first chamber 13a acts as a buffer, reducing the flow velocity of the refrigerant, resulting in more uniform and finer refrigerant bubbles and less flow noise. In this case, the aforementioned flow channel S1 also includes the first chamber 13a.

[0048] In a specific configuration, a second chamber 13b can be provided between the valve port 11a and the first porous component 21 (the uppermost porous component). In this way, the refrigerant flowing out of the valve port 11a or flowing through the first porous component 21 is buffered in the second chamber 13b, which can further reduce noise and avoid throttling. At this time, the aforementioned flow channel S1 also includes the second chamber 13b.

[0049] In a specific configuration, a third chamber 13c can be provided between the second porous element 22 (the lowermost porous element). This allows the refrigerant to be buffered when entering or exiting the second porous element 22, further reducing noise and avoiding throttling. In this case, the aforementioned flow channel S1 also includes the third chamber 13c.

[0050] Combination Figure 2 and Figure 3When the microporous structures of the first porous component 21 and the second porous component 22 are blocked and the refrigerant cannot flow, the refrigerant can only flow through the flow channel S1. If the first port 14 is used as the refrigerant outlet, after the refrigerant flows out from the valve port 11a, it first enters the second chamber 13b, then flows out from the first flow channel 211, enters the first chamber 13a, then flows out from the second flow channel 221, enters the third chamber 13c, and finally flows out from the first port 14. If the first port 14 is used as the refrigerant inlet, after the refrigerant flows in from the first port 14, it first enters the third chamber 13c, then flows out from the second flow channel 221, enters the first chamber 13a, then flows out from the first flow channel 211, enters the second chamber 13b, and then flows out from the valve port 11a.

[0051] The first chamber 13a has a first axial dimension L1, exemplarily 0.3mm ≤ L1 ≤ 5mm, to ensure that the refrigerant can be adequately buffered between two adjacent porous components, and that the air bubbles dispersed by the porous components can be more uniformly distributed, thereby improving the noise reduction effect. In other embodiments, the first axial dimension L1 can be set according to the actual noise reduction requirements, and is not limited to the aforementioned range.

[0052] The second chamber 13b has a second axial dimension L2, exemplarily L2 ≥ 0.3 mm, to ensure that the refrigerant is adequately buffered between the valve port 11a and the first porous member 21, thereby improving the noise reduction effect. Similarly, the range of the second axial dimension L2 can be adjusted according to actual needs and is not limited to the aforementioned range.

[0053] For example, the maximum diameter d2 of the second chamber 13b is not less than 1.1 times the diameter of the valve port 11a, to prevent the refrigerant from being further throttled before and after passing through the valve port 11a, and to ensure the buffering effect of the refrigerant in the second chamber 13b. Generally, the second chamber 13b is set with a constant diameter.

[0054] For example, at least one of the porous components of the silencing component 20 has an equivalent diameter greater than the inner diameter d3 of the first connecting pipe 31, or at least one porous component has an equivalent diameter greater than twice the diameter of the valve port 11a. Experiments have shown that this arrangement of the electronic expansion valve provides better noise reduction. Compared to existing solutions that place the silencing structure within the first connecting pipe 31 or the second connecting pipe 32, the larger structure of the silencing component 20 results in a significantly improved noise reduction effect.

[0055] The equivalent diameter of a porous component is calculated based on the refrigerant's ability to flow through all the micropores in the component. However, since porous components may have flow channels or be partially obstructed during installation, their diameter is generally not the same as their equivalent diameter.

[0056] It should be noted that in other embodiments, when the silencing component 20 has three or more perforated parts, the aforementioned first chamber can be provided between two adjacent perforated parts, the aforementioned second chamber can be provided between the uppermost perforated part and the valve port 11a, and the aforementioned third chamber can be provided between the lowermost perforated part and the first interface 14.

[0057] The following is combined Figure 1 and Figure 4 This describes the changes in the refrigerant flow path and refrigerant state during operation.

[0058] When the refrigerant flows from the first pipe 31 into the third chamber 13c, a portion of the refrigerant directly enters the first chamber 13a through the second flow channel 221 of the second porous component 22. This portion of the refrigerant is defined as refrigerant X. Another portion of the refrigerant passes through the microporous structure of the second porous component 22. The bubbles in this other portion of the refrigerant are dispersed and refined by the microporous structure, making the gas phase and liquid phase in the refrigerant evenly distributed. Afterward, this other portion of the refrigerant passes through the microporous structure of the second porous component 22 into the first chamber 13a. This other portion of the refrigerant is defined as refrigerant X'.

[0059] Because the second flow channel 221 of the second porous component 22 corresponds directly above the microporous structure of the first porous component 21, most of the refrigerant X reaching the first chamber 13a will pass through the microporous structure of the first porous component 21. The bubbles in the refrigerant are broken down and refined by the microporous structure before entering the second chamber 13b. This part of the refrigerant is defined as Y. A portion of the refrigerant X' reaching the first chamber 13a will pass through the microporous structure of the first porous component 21. The bubbles in it will be further broken down and refined by the microporous structure before entering the second chamber 13b. This portion of the refrigerant is defined as Y'. The remaining portion of the refrigerant X' reaching the first chamber 13a will pass through the first flow channel 211 of the first porous component 21 and directly enter the second chamber 13b. This portion of the refrigerant is defined as Y'". In this way, the refrigerant Y, refrigerant Y', and refrigerant Y'" entering the second chamber 13b are all refrigerants refined by the microporous structure of the porous component, resulting in a more uniform distribution of gaseous and liquid states within the refrigerant.

[0060] The refrigerant (refrigerant Y, refrigerant Y' and refrigerant Y”) entering the second chamber 13b is throttled at the valve port 11a, causing changes in the refrigerant pressure, temperature and phase. Because the refrigerant entering the second chamber 13b is in a uniform state, the noise continuity experience when it is throttled at the valve port 11a is better, the sound performance is more gentle and the loudness can be greatly reduced.

[0061] When refrigerant flows in from the second connector 32 and out from the first connector 31, the refrigerant flow direction is reversed. The refrigerant first passes through the valve port 11a for throttling, then sequentially enters the second chamber 13b, the first porous element 21, the first chamber 13a, the second porous element 22, and the third chamber 13c, finally flowing out from the first connector 31. After throttling, the refrigerant is further refined by the microporous structure as it passes through the first and second porous elements 21 and 22, resulting in a more uniform refrigerant state and reduced noise during refrigerant flow.

[0062] It should be understood that since the silencing component 20 is located in the second valve chamber 13, the aforementioned first chamber 13a, second chamber 13b and third chamber 13c are all part of the second valve chamber 13.

[0063] Please refer to this as well. Figures 6 to 9 , Figure 6 for Figure 5 Top view; Figure 7 for Figure 5 A bottom view; Figure 8 for Figure 5 A cross-sectional schematic diagram of the first porous component; Figure 9 for Figure 5 A schematic diagram of the structure of the second porous component.

[0064] For example, the first flow channel 211 of the first porous component 21 is a through hole located at its center, and the second flow channel 221 of the second porous component 22 is a structure of five flow grooves, which are formed by radially inward recesses from the outer peripheral wall of the second porous component 22. In this case, the flow area of ​​the first flow channel 211 is the area of ​​the central through hole. When configured, the diameter d1 of the first flow through hole 211 is greater than the maximum equivalent flow area of ​​the valve port 11a, and the flow area of ​​the second flow channel 221 is the equivalent flow area of ​​the five flow grooves.

[0065] In the figure, the five flow grooves of the second porous component 22 are evenly arranged along its circumference, and the shape and size of each flow groove are the same. In other embodiments, the second porous component 22 may also be provided with other numbers of flow grooves as the second flow channel 221, and the size and shape of each flow groove may also be different. Alternatively, the second porous component 22 may also be provided with through holes that pass through it as the second flow channel 221.

[0066] like Figure 2 As shown, the valve needle 50 of the electronic expansion valve is in a state of fully closing the valve port 11a. In the illustrated structural example, the valve needle 50 passes through the valve port 11a and extends into the second valve chamber 13, and extends into the first flow channel 211 of the first porous member 21. At this time, the first flow channel 211 also serves as a clearance hole for the valve needle 50 when the valve is fully closed.

[0067] In other embodiments, the first porous member 21 may also have through holes in other locations to form a first flow channel 211, or a flow groove may be provided in the same location as the second porous member 22 to form at least part of the first flow channel 211. In this case, if the valve needle 50 is fully closed, it will interfere with the first porous member 21. A blind hole may be provided at the center of the first porous member 21 to form a clearance hole to avoid the valve needle 50.

[0068] In this embodiment, the first porous component 21 and the second porous component 22 are separated by an annular pad 23 to form a first chamber 13a between them. It can be understood that the first axial dimension L1 of the first chamber 13a is related to the thickness of the annular pad 23. In specific configuration, the size of the annular pad 23 should, while ensuring support for the first porous component 21, minimize its impact on the equivalent diameter of the porous component.

[0069] In specific applications, the muffler component 20 also includes a sleeve 24. The first porous component 21 and the second porous component 22 are both installed inside the sleeve 24. The sleeve 24 is circumferentially sealed to the second valve chamber 13. The sleeve 24 is also axially upper limit connected to the valve body component 10 to prevent the relevant structures of the muffler component 20 from shifting.

[0070] In a specific configuration, the outer peripheral wall of the sleeve 24 can fit in circumferential direction with part of the cavity wall of the second valve cavity 13, thus ensuring that all refrigerant flows through the silencer component 20.

[0071] As shown above, after setting the sleeve 24, the silencer component 20 can be integrated into a whole, which facilitates the assembly with the valve body component 10.

[0072] For ease of assembly, the valve body component 10 is designed as a split structure, including a valve body 101 and a valve seat 102. As shown in the figure, the valve port 11a, the first valve chamber 12, and part of the second valve chamber 13 are located on the valve body 101, while part of the second valve chamber 13 and the first interface 14 are located on the valve seat 102. The valve body 101 has a downward-facing first limiting surface 111, and the valve seat 102 has an upward-facing second limiting surface 121. The upper end face of the sleeve 24 abuts against the first limiting surface 111, and the lower end face of the sleeve 24 abuts against the second limiting surface 121.

[0073] Combination Figure 4 and Figure 5 In a specific configuration, the top wall of the first porous component 21 is flush with the upper end face of the sleeve 24, allowing a portion of the first limiting surface 111 to press against the first porous component 211. Combined with the annular pad 23, this restricts the axial position of the first porous component 211 within the sleeve 24, avoiding the need for an additional axial limiting structure between the first porous component 211 and the sleeve 24. Similarly, the second porous component 22 can also be supported by the second limiting surface 121, and its axial position within the sleeve 24 can be restricted in conjunction with the annular pad 23.

[0074] It should be understood that in other embodiments, when the silencing component 20 has three or more porous components, adjacent porous components are separated by an annular pad, the uppermost porous component can abut against and be limited by the first limiting surface 111, and the lowermost porous component can be supported by the second limiting surface 121.

[0075] In actual assembly, the muffler 20 is first installed inside the valve body 101 before the valve body 101 and valve seat 102 are fixed relative to each other. Usually, the valve body 101 and valve seat 102 are fixed by welding, generally by brazing. To prevent the solder from penetrating into the porous part of the muffler 20 during welding of the valve body 101 and valve seat 102 and affecting the microporous structure of the porous part, the lower end of the sleeve 24 has a bent portion 241 that bends radially inward. At this time, the second porous part 22 (the porous part located at the bottom) can be supported by the bent portion 241. During assembly, the bent portion 241 of the sleeve 24 abuts against the second limiting surface 121 of the valve seat 102 for limiting. Under the wrapping effect of the sleeve 24, the solder from welding the valve seat 102 and the valve body 101 can be prevented from entering the interior of the porous part.

[0076] Second embodiment:

[0077] Please refer to Figures 10 to 12 , Figure 10 This is a cross-sectional schematic diagram of the noise-reducing component in the second embodiment provided in this application; Figure 11 for Figure 10 Top view; Figure 12 for Figure 10 A bottom view.

[0078] In this embodiment, the silencing component 20' of the electronic expansion valve includes a first porous component 21', a second porous component 22, an annular pad 23, and a sleeve 24. The first porous component 21', the second porous component 22, and the annular pad 23 are all disposed inside the sleeve 24. The annular pad 23 is used to separate the first porous component 21' and the second porous component 22 to form a first chamber between them.

[0079] In this embodiment, the structure of the second porous component 22, the annular gasket 23 and the sleeve 24 of the silencing component 20' is similar to that of the first embodiment described above. The assembly and mating relationship between the silencing component 20' and the valve body component 10 is also similar to that of the first embodiment described above. All of these can be understood by referring to the foregoing description, and will not be repeated here.

[0080] In this embodiment, the first porous component 21' and the second porous component 22 adopt similar structures. Their first flow channel 211' is a structure of several flow grooves, which are formed by radially inward recesses from the outer peripheral wall of the first porous component 21'. During assembly, the first flow channel 211' of the first porous component 21' and the second flow channel 221 of the second porous component 22 are not axially corresponding and are staggered.

[0081] In the illustrated scheme, the first porous component 21' and the second porous component 22 both exemplarily illustrate the structure of three flow channels. In other embodiments, the specific shape, number, and arrangement of the flow channels can be set as needed.

[0082] The silencing component 20' provided in this embodiment is suitable for situations where the valve needle 50 and the silencing component 20' do not interfere with each other when the electronic expansion valve is in the fully closed state.

[0083] Figure 1 and Figure 4 In the first embodiment, when the electronic expansion valve is fully closed, the valve needle 50, being relatively long, will pass through the valve port 11a and interfere with the first porous component 21 of the muffler 20. Therefore, in the first embodiment, the first flow channel 211 of the first porous component 21 is designed as a through-hole structure located in the middle, serving both as a flow channel and allowing the valve needle 50 to pass through. However, in some embodiments, when the electronic expansion valve is fully closed, the valve needle 50 will not pass through the valve port 11a into the second valve chamber 13, or even if it does pass through the valve port 11a, it will not interfere with the first porous component 21 (the uppermost porous component). In this case, the uppermost porous component of the muffler 20 does not need to have a clearance hole to avoid the valve needle 50, so its structure can be designed as follows: Figures 10 to 11 The structure shown.

[0084] It should be understood that the silencer component 20 can still be used even when the valve needle 50 and the first porous component 21 do not interfere with each other. Figure 5 The structure shown.

[0085] In this embodiment, after the silencing component 20' is assembled with the valve body component 10, a second chamber 13b is also provided between the first porous component 21' and the valve port 11a, and a third chamber 13c is also provided between the second porous component 22 and the first interface 14. The relevant dimensions and other settings of each chamber are similar to those in the first embodiment described above, and will not be repeated.

[0086] Third embodiment:

[0087] Please refer to Figures 13 to 17 , Figure 13 This is a schematic diagram of the structure of the noise reduction component in the third embodiment provided in this application; Figure 14 for Figure 13 A cross-sectional schematic diagram of the noise reduction component shown; Figure 15 for Figure 13 Schematic diagram of the middle sleeve; Figure 16 for Figure 13 Cross-sectional schematic diagram of the middle partition; Figure 17 for Figure 16 The bottom view of the partition shown.

[0088] In this embodiment, the silencing component 20” of the electronic expansion valve includes a first porous component 21, a second porous component 22', a sleeve 24', and a separator 25. The first porous component 21, the second porous component 22', and the separator 25 are all disposed inside the sleeve 24'. The separator 25 is used to separate the first porous component 21 and the second porous component 22' to form a first chamber between them.

[0089] Compared with the first embodiment described above, the structural design of the sleeve 24', the separator 25, and the second porous component 22' is different in this embodiment, and the flow channel S2 of the corresponding electronic expansion valve is also different. The differences will be described in detail below.

[0090] The main structure of the electronic expansion valve can be referenced. Figure 1 and Figure 2 It is understood that the first porous component 21 of the silencing component 20” has a first flow channel 211, the second porous component 22' has a gap between it and the cavity wall of the second valve chamber 13, and the separator 25 has a connecting hole 2511, which is used to connect the first flow channel 211 and the gap. The flow channel S2 of the electronic expansion valve includes the first flow channel 211, the connecting hole 2511 and the gap. In the projection plane perpendicular to the axial direction of the valve body component 10, the projection of the first flow channel 211 does not coincide with the projection of the connecting hole 2511, so as to avoid the refrigerant flowing through the first flow channel 211 from flowing directly through the connecting hole 2511.

[0091] As set up above, part of the structure of the flow channel S2 corresponding to the silencing component 20 is formed inside the first porous component 21, and part of the structure is formed between the second porous component 22' and the second valve chamber 13. In this way, the second porous component 22' does not need to be provided with a flow channel and is entirely a microporous structure.

[0092] In a specific configuration, the sleeve 24' has its cylindrical wall completely covering the first porous component 21, and the sleeve 24' has an opening 242' at the location corresponding to the second porous component 22', so as to form the aforementioned gap between the second porous component 22' and the cavity wall of the second valve chamber 13.

[0093] For example, such as Figure 14As shown, the sleeve 24' has four openings 242' along the circumference near the lower part of the sleeve wall. The four openings 242' are evenly arranged along the circumference of the sleeve 24'. After assembly, the second porous component 22' has gaps between these openings 242' and the second valve chamber 13. The flow area of ​​the flow channel S2 corresponding to this part is the sum of the flow areas of all the gaps. Its size requirement is still the same as that of the first embodiment mentioned above, and will not be repeated here.

[0094] Accordingly, to prevent solder from entering the microporous structure of the silencing component 20” during welding between the valve body 101 and the valve seat 102 after the silencing component 20” is assembled, the lower end of the sleeve 24’ is also provided with a bent portion 241’. Compared with the annular bent portion 241 in the first embodiment, the bent portions 241’ are discontinuous in this example because the opening 242’ of the sleeve 24’ is provided.

[0095] The limiting and matching structure between the silencing component 20” and the valve body component 10 is similar to that in the first embodiment described above, and will not be repeated here.

[0096] Figure 14 Taking the direction of refrigerant flow to the first interface 14 as an example, the arrows indicate the direction of refrigerant flow in the flow channel S2.

[0097] In a specific configuration, the separator 25 includes a ring body 251, which has an annular structure. Its outer peripheral wall extends upward along the axial direction to form an upper protrusion 252, and its inner peripheral wall extends downward along the axial direction to form a lower protrusion 253. The upper protrusion 252 and the lower protrusion 253 respectively abut against the first porous member 21 and the second porous member 22'. The aforementioned connecting hole 2511 is provided on the ring body 251. In this way, when the first porous member 21 and the second porous member 22' cannot supply refrigerant due to blockage, the refrigerant can flow from the first flow channel 211 into the first chamber between the first porous member 21 and the second porous member 22', and then flow out through the connecting hole 2511 to the gap between the second porous member 22' and the second valve chamber 13, and then flow out from the first interface 14. When the first interface 14 is used as the refrigerant inlet, the refrigerant flow direction is opposite to the previous one.

[0098] For example, multiple connecting holes 2511 can be provided along the circumference of the ring body 251, such as... Figure 17 As shown.

[0099] In the illustrated example, the structure of the first porous component 21 is consistent with the first embodiment described above. It can be understood that in other embodiments, the first flow channel 211 of the first porous component 21 can also be set at other positions that are axially offset from the connecting hole 2511.

[0100] In other embodiments, the connecting hole 2511 may also be provided to at least partially penetrate the upper protrusion 252 or the lower protrusion 253.

[0101] In this embodiment, after the silencing component 20” is assembled with the valve body component 10, a second chamber 13b is also provided between the first porous component 21 and the valve port 11a, and a third chamber 13c is also provided between the second porous component 22' and the first interface 14. The relevant dimensions and other settings of each chamber are similar to those in the first embodiment described above, and will not be repeated.

[0102] The above embodiments are all illustrated with the example of a silencing component having two porous parts. It can be understood that, based on the above embodiments, the silencing component may also have three or more porous parts. The idea of ​​the related structure is the same as that of the above embodiments, and will not be described in detail here.

[0103] The electronic expansion valve provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. An electronic expansion valve, characterized in that, The valve body component (10) includes a valve port portion (11), which includes a first wall portion (112), a second wall portion (113), and a third wall portion (114). The electronic expansion valve includes a first valve chamber (12) and a second valve chamber (13). The first wall portion (112) is closer to the first valve chamber (12) than the second wall portion (113), and the third wall portion (114) is closer to the second valve chamber (13) than the second wall portion (113). The inner diameter D1 of the first wall portion (112) is smaller than the inner diameter D2 of the third wall portion (114). The height H1 of the first wall portion (112) satisfies the following condition: 0.08mm ≤ H1 ≤ 0.3mm.

2. The electronic expansion valve as described in claim 1, characterized in that, The height H3 of the third wall portion (114) satisfies: H3≥6H1 and H3≤8mm.

3. The electronic expansion valve as described in claim 1, characterized in that, The inner diameter D1 of the first wall portion (112) and the inner diameter D2 of the third wall portion (114) satisfy the following relationship: 1.05D1≤D2≤2.5D2.

4. The electronic expansion valve as described in claim 1, characterized in that, At least a portion of the second wall portion (113) includes a conical segment (1131) with a cone angle α satisfying: 50°≤α≤70° and a height H2 satisfying: 0.2mm≤H2≤0.6mm.

5. The electronic expansion valve as described in claim 4, characterized in that, A transition portion (1132) is provided between the conical segment (1131) and the first wall portion (112), and the conical segment (1131) is connected to the first wall portion (112) through the transition portion (1132).

6. The electronic expansion valve according to any one of claims 1-5, characterized in that, The electronic expansion valve includes a silencing component (20), at least a portion of which is located in the second valve chamber (13). The silencing component includes two or more porous elements, each of which is arranged axially along the valve body component (10). The electronic expansion valve includes a flow channel (S1), at least a portion of which penetrates at least one of the porous elements.

7. The electronic expansion valve as described in claim 6, characterized in that, The silencing component (20) includes a first porous component (21) and a second porous component (22). The first porous component (21) is provided with a first flow channel (211), and the second porous component (22) is provided with a second flow channel (221). In the projection plane perpendicular to the axial direction of the valve body component (10), the projections of the first flow channel (211) and the second flow channel (221) do not coincide.

8. The electronic expansion valve as described in claim 7, characterized in that, An annular pad (23) is provided between the first porous member (21) and the second porous member (22), and the first porous member (21), the second porous member (22), and the annular pad (23) at least partially define a first chamber (13a), which forms part of the flow channel (S1).

9. The electronic expansion valve as described in claim 6, characterized in that, A second chamber (13b) is provided between the first porous member (21) and the valve port (11), and the second chamber (13b) forms part of the flow channel (S1).

10. The electronic expansion valve as described in claim 6, characterized in that, The electronic expansion valve includes a third chamber (13c) located on the side of the second porous element (22) away from the second chamber (13b), and the third chamber (13c) forms part of the flow channel (S1).

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