Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve which comprises a valve body component and a silencing component. The valve body component is provided with a valve port, a first valve cavity, a second valve cavity and a first connector, the first valve cavity is communicated with the second valve cavity through the valve port, the first connector is directly communicated with the second valve cavity, and the first valve cavity is located above the second valve cavity; the silencing part is located in the second valve cavity and comprises a sleeve and two or more porous parts, the porous parts are installed in the sleeve, the sleeve is in sealing connection with the second valve cavity in the circumferential direction, and the sleeve is in limiting connection with the valve body part in the axial direction; the multi-hole pieces are arranged in the axial direction of the valve body component, each multi-hole piece is provided with a circulation channel, and in a projection plane perpendicular to the axial direction of the valve body component, projections of the circulation channels of every two adjacent multi-hole pieces do not coincide. The valve port can communicate with the first connector through the circulation channels. The electronic expansion valve can reduce noise caused by refrigerant flowing.

Description

[0001] This application is a divisional application of patent application number 202310461427.0, application date April 24, 2023, and invention name “Electronic Expansion Valve”. Technical Field

[0002] The present application relates to the field of refrigeration control technology, and in particular to an electronic expansion valve. Background Art

[0003] As a throttling element, the electronic expansion valve has the advantages of high adjustment accuracy and precise temperature control, and is widely used in air conditioning, refrigeration and other fields.

[0004] During operation, when the refrigerant flows through the throttling part of the electronic expansion valve, the refrigerant pressure and flow rate will change dramatically due to the rapid changes in the throttling area and shape, and refrigerant noise may occur. In the application scenarios of electronic expansion valves such as household air conditioners, the loud noise will affect the people in the environment and give them a bad experience. Therefore, how to improve the noise comfort of electronic expansion valves in applications has become one of the key topics of concern in the industry.

[0005] In the existing scheme, a porous body is usually set in the pipe of the electronic expansion valve (including the inlet pipe and the outlet pipe) to make the pressure of the refrigerant flowing through the throttling part uniform, so as to reduce the noise of the refrigerant flow. Since the flow area of ​​the porous body is small, throttling is easy to occur in the porous body. At the same time, impurities in the system are easy to block the porous body. The porous body is located in the pipe, and blockage will cause the whole machine to fail. Summary of the invention

[0006] The purpose of the present application is to provide an electronic expansion valve which, through structural optimization, can reduce the noise caused by the flow of refrigerant and improve the noise comfort of the electronic expansion valve in the system while ensuring that the electronic expansion valve works effectively and reliably.

[0007] In order to solve the above technical problems, the present application provides an electronic expansion valve, including a valve body component and a silencer component;

[0008] The valve body component has a valve port, a first valve cavity, a second valve cavity and a first interface, the first valve cavity is connected with the second valve cavity through the valve port, the first interface is directly connected with the second valve cavity, and the first valve cavity is located above the second valve cavity;

[0009] The muffler component is located in the second valve cavity, and includes a sleeve and two or more porous components, each of which is installed inside the sleeve, the sleeve is sealed and connected to the second valve cavity in the circumferential direction, and the sleeve is connected to the valve body component in the axial upper limit direction;

[0010] The porous parts are arranged along the axial direction of the valve body component, and each of the porous parts is provided with a circulation channel. In the projection plane perpendicular to the axial direction of the valve body component, the projections of the circulation channels of two adjacent porous parts do not overlap; the valve port can be connected to the first interface through each of the circulation channels.

[0011] The electronic expansion valve sets the silencer component in the second valve chamber. In use, most of the refrigerant will pass through the silencer component, and the bubbles in the refrigerant will be broken up and refined by the pore structure of the porous component, so that the gas phase and liquid phase in the refrigerant are more evenly distributed, improving the fluid state of the refrigerant entering the throttling part or after the refrigerant is throttled, so that the sound performance of the refrigerant before and after throttling is more moderate, and the noise is also greatly reduced, thereby improving the comfort of the human ear. At the same time, the silencer component is provided with more than two porous components, each of which is provided with a flow channel. After a porous component is blocked, the refrigerant can flow through the flow channel of the blocked porous component and achieve the purpose of noise reduction through other porous components, which can extend the effective working time of the silencer component. If all the porous components are blocked by impurities, the refrigerant can also flow through the flow channels of each porous component, avoiding the problem of functional failure caused by the blockage of the silencer component. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A cross-sectional schematic diagram of an electronic expansion valve in the first embodiment provided in the present application;

[0013] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0014] Figure 3 for Figure 2 A schematic cross-sectional view of a middle silencer component;

[0015] Figure 4 for Figure 3 A top view of

[0016] Figure 5 for Figure 3 Bottom view of

[0017] Figure 6 for Figure 3 A cross-sectional schematic diagram of the first porous member;

[0018] Figure 7 for Figure 3 A schematic structural diagram of the second porous member;

[0019] Figure 8 for Figure 1 A partial enlarged view of the valve port of the Zhongdian expansion valve in the fully open state;

[0020] Fig. 9A cross-sectional schematic diagram of the muffler component in the second embodiment provided in the present application;

[0021] Fig.10 for Fig. 9 A top view of

[0022] Fig.11 for Fig. 9 Bottom view of

[0023] Fig.12 This is a schematic structural diagram of the silencer component in the third embodiment provided in the present application;

[0024] Fig.13 for Fig.12 A schematic cross-sectional view of the muffler component shown;

[0025] Fig.14 for Fig.12 A schematic diagram of the structure of the middle sleeve;

[0026] Fig.15 for Fig.12 A schematic cross-sectional view of a middle separator;

[0027] Fig.16 for Fig.15 a bottom view of the illustrated divider;

[0028] Fig.17 It is a partial cross-sectional schematic diagram of the electronic expansion valve in the fourth embodiment provided in the present application.

[0029] Description of reference numerals:

[0030] Valve body component 10, valve port portion 11, valve port 11a, first valve cavity 12, second valve cavity 13, first chamber 13a, second chamber 13b, third chamber 13c, first interface 14, second interface 15, valve body 101, first limiting surface 111, valve seat body 102, second limiting surface 121, annular boss 122, flow channels S1, S2, gap K;

[0031] Silencer 20, 20', 20'', first porous member 21, 21', first flow channel 211, 211', second porous member 22, 22', second flow channel 221, annular pad 23, sleeve 24, 24', bending portion 241, 241', opening 242', partition 25, ring body 251, communication hole 2511, upper convex portion 252, lower convex portion 253,

[0032] A first connecting pipe 31 and a second connecting pipe 32;

[0033] Driving component 40 , valve needle 50 . DETAILED DESCRIPTION

[0034] The embodiment of the present application provides an electronic expansion valve, which can reduce the noise caused by the flow of refrigerant and improve noise comfort while ensuring that the electronic expansion valve works effectively and reliably.

[0035] refer to Figure 1 It is understood that the electronic expansion valve provided in the embodiment of the present application includes a valve body component 10 , a first connecting pipe 31 , a second connecting pipe 32 , a driving component 40 and a valve needle 50 .

[0036] The valve body component 10 includes a valve mouth portion 11, the valve mouth portion 11 has a valve port 11a, the valve body component 10 also has a first valve cavity 12, a second valve cavity 13, a first interface 14 and a second interface 15, the first valve cavity 12 is located above the second valve cavity 13, the first valve cavity 12 is connected to the second valve cavity 12 through the valve port 11a, the first interface 14 is directly connected to the second valve cavity 13, the first interface 14 is generally arranged below the valve body component 10, the second interface 15 is directly connected to the first valve cavity 12, the second interface 15 is generally arranged on the peripheral side of the valve body component 10, the first interface 14 is used to connect the first connecting pipe 31, and the second interface 15 is used to connect the second connecting pipe 32.

[0037] The driving 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 perspective shown, the axial direction refers to the up-down direction in the figure, so that when the valve port 11a is opened, the refrigerant flowing from the first connecting pipe 31 into the second valve cavity 13 can enter the first valve cavity 12 through the valve port 11a and flow out from the second connecting pipe 32, or the refrigerant flowing from the second connecting pipe 32 into the first valve cavity 12 can enter the second valve cavity 13 through the valve port 11a and flow out from the first connecting pipe 31. It can be understood that the electronic expansion valve can be set as a valve that can flow in both directions, or can be set as a valve that can only flow in one direction, according to the application needs.

[0038] Usually, a transmission component is further provided between the driving component 40 and the valve needle 50. In the present application, the specific structure of the driving component 40 and the specific structure of the transmission component are not the core invention points of the present application and are not described in detail here. Figure 1 The specific structure of an electronic expansion valve is only given as an example. In other embodiments, the transmission connection relationship between the driving component 40 and the valve needle 50 can be changed as needed, or other existing transmission designs can be adopted, not limited to those shown in the figure.

[0039] When the electronic expansion valve is applied to a household environment or other application scenarios, in order to reduce the large noise generated when the refrigerant passes through the valve port 11a (throttling part) and affects the comfort of the human ear, the electronic expansion valve provided in the embodiment of the present application is also provided with a muffler component 20, the muffler component 20 is located in the second valve cavity 13, and the outer peripheral wall of the muffler component 20 is at least partially in contact with the cavity wall of the second valve cavity 13; the muffler component 20 includes more than two porous parts, and each porous part is arranged along the axial direction of the valve body component 10; the electronic expansion valve also includes a flow channel, at least part of the flow channel passes through at least one porous part, the flow channel can connect the valve port 11a and the first interface 14, and the minimum effective flow area of ​​the flow channel is greater than the maximum equivalent flow area of ​​the valve port 11a. The porous part here refers to a component with multiple microporous structures inside, and the aperture of the micropores is smaller than the diameter of the valve port 11a. The specific aperture value can be determined according to actual needs, and no specific numerical value is limited here.

[0040] The minimum effective flow area of ​​the flow channel refers to the minimum area of ​​the cross-sectional area of ​​the flow channel that can allow the fluid to pass through, and the cross-sectional area of ​​the flow channel is the cross-sectional area perpendicular to the axis of the flow channel; the maximum equivalent flow area of ​​the valve port 11a refers to the maximum flow area when the fluid flows through the valve port 11a when the electronic expansion valve is in a fully open valve state.

[0041] As described above, the silencer component 20 is arranged in the second valve chamber 13. In application, when the refrigerant flows from the first connecting pipe 31 to the second connecting pipe 32, or from the second connecting pipe 32 to the first connecting pipe 31, most of the refrigerant will pass through the silencer component 20, and the bubbles in the refrigerant will be broken up and refined by the pore structure of the porous component, so that the gas phase and liquid phase in the refrigerant are more evenly distributed, and the fluid state of the refrigerant entering the throttling part (i.e., the valve port 11a) or the refrigerant after throttling is improved, so that the sound performance of the refrigerant before and after throttling is more moderate, and the noise is also greatly reduced, thereby improving the comfort of the human ear.

[0042] At the same time, the electronic expansion valve is also provided with the above-mentioned flow channel, and the silencer component 20 is provided with more than two porous parts. After one porous part is blocked, the refrigerant can achieve the purpose of noise reduction through other porous parts, which can extend the effective working time of the silencer component 20. If all the porous parts are blocked by impurities, the refrigerant can still flow through the flow channel, avoiding the functional failure problem caused by the blockage of the silencer component 20.

[0043] Setting the minimum effective flow area of ​​the flow channel larger 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, thereby affecting the working performance of the electronic expansion valve.

[0044] Therefore, the electronic expansion valve provided in the embodiment of the present application can reduce the noise caused by the flow of refrigerant and improve noise comfort while ensuring its reliable and effective operation.

[0045] In practical applications, the silencer component 20 can be arranged in a variety of ways to achieve the above functions. The specific structure of the silencer component 20 and its coordination with the valve body component 10 are described in detail below with reference to several specific embodiments.

[0046] In the following embodiments, the silencer component 20 is provided with two porous parts as an example for illustrative description. Those skilled in the art can set more than three porous parts on this basis, and the relevant structure can be adaptively changed on the basis of each embodiment. For the convenience of understanding and description, the two porous parts are referred to as the first porous part and the second porous part in each embodiment.

[0047] First embodiment:

[0048] Please refer to Figures 1 to 3 , Figure 1 A cross-sectional schematic diagram of an electronic expansion valve in the first embodiment provided in the present application; Figure 2 for Figure 1 A partial enlarged view of the middle A area; Figure 3 for Figure 2 Schematic cross-section of the silencer component.

[0049] In this embodiment, the silencer component 20 is an overall cylindrical structure, and its outer peripheral wall is sealed and connected to the cavity wall of the second valve cavity 13. That is to say, the silencer component 20 is sealed and connected to the second valve cavity 13 in the circumferential direction. In this way, the refrigerant can only flow between the first connecting pipe 31 and the second connecting pipe 32 through the silencer component 20. At this time, a part of the flow channel is formed inside the silencer component 20.

[0050] like Figure 2 As shown, the electronic expansion valve has a flow channel S1, and the arrows in the figure illustrate the flow direction of the refrigerant in the flow channel S1, taking the first connecting pipe 31 as the refrigerant outflow end as an example.

[0051] The silencer 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 arranged relatively close to the valve port 11a, and the second porous component 22 is arranged 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 diameters of the first flow channel 211 and the second flow channel 221 are both larger than the pore size of the microporous structure of the porous component, and the flow areas of the first flow channel 211 and the second flow channel 221 are 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 circulation channel 211 and the projection of the second circulation channel 221 do not overlap. In other words, the first circulation channel 211 and the second circulation channel 221 do not correspond to each other in the axial direction of the valve body component 10. This can prevent the refrigerant from directly flowing into the second circulation channel 221 after flowing through the first circulation channel 211, or from directly flowing into the first circulation channel 211 after flowing out of the second circulation channel 221, thereby avoiding the phenomenon that the refrigerant flows out without changing the state of the microporous structure of the porous component.

[0052] There is a first chamber 13a between the first porous member 21 and the second porous member 22, so that throttling of the refrigerant can be avoided when the refrigerant flows through the first porous member 21 and the second porous member 22. At the same time, the first chamber 13a acts as a buffer to reduce the flow rate of the refrigerant flowing through, so that the refrigerant bubbles are more uniformly refined and the flow noise is smaller. At this time, the aforementioned flow channel S1 also includes the first chamber 13a.

[0053] In specific configuration, a second chamber 13b may be provided between the valve port 11a and the first porous member 21 (the uppermost porous member), so that the refrigerant flowing out of the valve port 11a or the refrigerant flowing through the first porous member 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.

[0054] In the specific configuration, the third chamber 13c can be provided between the second porous members 22 (the porous members located at the bottom), so that the refrigerant can be buffered after entering or flowing out of the second porous members 22, which can further reduce noise and avoid throttling. At this time, the aforementioned flow channel S1 also includes the third chamber 13c.

[0055] Combination Figure 2 and Figure 3When the microporous structures of the first porous member 21 and the second porous member 22 are blocked and the refrigerant cannot flow, the refrigerant can only flow through the flow channel S1. If the first interface 14 is used as the refrigerant outflow end, after the refrigerant flows out from the valve port 11a, it first enters the second chamber 13b, then flows out from the first circulation channel 211, enters the first chamber 13a, then flows out from the second circulation channel 221, enters the third chamber 13c, and finally flows out from the first interface 14; if the first interface 14 is used as the refrigerant inflow end, after the refrigerant flows in from the first interface 14, it first enters the third chamber 13c, then flows out from the second circulation channel 221, enters the first chamber 13a, then flows out from the first circulation channel 211, enters the second chamber 13b, and then flows out from the valve port 11a.

[0056] The first chamber 13a has a first axial dimension L1, illustratively, 0.3mm≤L1≤5mm, to ensure that the refrigerant can be adequately buffered between two adjacent porous members, and the bubbles dispersed by the porous members can be more uniform, so as to improve the noise reduction effect. In other embodiments, the first axial dimension L1 can be set according to actual requirements for noise reduction, etc., and is not limited to the aforementioned range.

[0057] The second chamber 13b has a second axial dimension L2, illustratively, L2 ≥ 0.3 mm, to ensure that the refrigerant can be adequately buffered between the valve port 11a and the first porous member 21, so as to improve 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.

[0058] Exemplarily, 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 speaking, the second chamber 13b is set with equal diameter.

[0059] For example, at least one of the porous members of the muffler component 20 has an equivalent diameter greater than the inner diameter d3 of the first connecting pipe 31, or at least one of the porous members has an equivalent diameter greater than twice the diameter of the valve port 11a. Tests have shown that the noise reduction effect of the electronic expansion valve is better when the muffler structure is set in the first connecting pipe 31 or the second connecting pipe 32. Compared with the existing solution of setting the muffler structure in the first connecting pipe 31 or the second connecting pipe 32, the noise reduction effect is obvious and has been greatly improved because the structure of the muffler component 20 is set larger.

[0060] The equivalent diameter of a porous part is calculated based on all the microporous structures through which the refrigerant can flow. Because the porous part is provided with a flow channel or the porous part has a blocked portion due to installation requirements, the diameter of the porous part is generally not equal to its equivalent diameter.

[0061] It should be pointed out that in other embodiments, when there are more than three porous parts of the silencer component 20, the aforementioned first chamber can be set between two adjacent porous parts, the aforementioned second chamber can be set between the uppermost porous part and the valve port 11a, and the aforementioned third chamber can be set between the lowermost porous part and the first interface 14.

[0062] Combine the following Figure 1 and Figure 2 Describes the changes in the refrigerant flow route and refrigerant status during operation.

[0063] When the refrigerant flows from the first connecting 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 member 22, and this portion of the refrigerant is defined as refrigerant X. Another portion of the refrigerant passes through the microporous structure of the second porous member 22, and the bubbles in the other portion of the refrigerant are broken up and refined by the microporous structure, so that the gas phase and liquid phase in the refrigerant are evenly distributed. Afterwards, the other portion of the refrigerant passes through the microporous structure of the second porous member 22 and enters the first chamber 13a. This other portion of the refrigerant is defined as refrigerant X'.

[0064] Since the microporous structure of the first porous member 21 corresponds to the second circulation channel 221 of the second porous member 22, most of the refrigerant X that reaches the first chamber 13a will pass through the microporous structure of the first porous member 21, and the bubbles in the refrigerant will be broken up and refined by the microporous structure before entering the second chamber 13b. This part of the refrigerant is defined as Y; part of the refrigerant X' that reaches the first chamber 13a will pass through the microporous structure of the first porous member 21, and the bubbles in it will be further broken up and refined by the microporous structure before entering the second chamber 13b. This part of the refrigerant is defined as Y'; the remaining part of the refrigerant X' that reaches the first chamber 13a will pass through the first circulation channel 211 of the first porous member 21 and directly enter the second chamber 13b. This part of the refrigerant is defined as Y''. In this way, the refrigerant Y, refrigerant Y' and refrigerant Y'' that enter the second chamber 13b are all refrigerants that have been refined by the microporous structure of the porous member, and the gaseous and liquid distributions in the refrigerant are more uniform.

[0065] The refrigerant (refrigerant Y, refrigerant Y' and refrigerant Y'') entering the second chamber 13b enters the valve port 11a for throttling, causing the refrigerant pressure, temperature and phase to change. Because the refrigerant entering the second chamber 13b is in a uniform state, the noise continuity experience generated when it passes through the valve port 11a for throttling is better, the sound performance is more moderate, and the loudness can be greatly reduced.

[0066] When the refrigerant flows in from the second connecting pipe 32 and flows out from the first connecting pipe 31, the flow direction of the refrigerant is opposite to the above, and the refrigerant first passes through the valve port 11a for throttling, and then enters the second chamber 13b, the first porous member 21, the first chamber 13a, the second porous member 22, and the third chamber 13c in sequence, and finally flows out from the first connecting pipe 31. When the throttled refrigerant passes through the first porous member 21 and the second porous member 22, it is also refined by the microporous structure, the state of the refrigerant is more uniform, and the noise of the refrigerant flow can also be reduced.

[0067] It should be understood that, since the silencer component 20 is disposed in the second valve chamber 13 , the aforementioned first chamber 13 a , second chamber 13 b and third chamber 13 c are all part of the second valve chamber 13 .

[0068] Please refer to Figures 4 to 7 , Figure 4 for Figure 3 A top view of Figure 5 for Figure 3 Bottom view of Figure 6 for Figure 3 A cross-sectional schematic diagram of the first porous member; Figure 7 for Figure 3 Schematic diagram of the structure of the second porous member.

[0069] Exemplarily, the first flow channel 211 of the first porous member 21 is in the form of a through hole arranged at the center thereof, and the second flow channel 221 of the second porous member 22 is in the form of a structure of five flow grooves, and the flow grooves are formed by radially inward depression from the outer peripheral wall of the second porous member 22. At this time, the flow area of ​​the first flow channel 211 is the area of ​​the central through hole, and when set, 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.

[0070] In the figure, the five flow grooves of the second porous member 22 are evenly arranged along its circumference, and the shapes and sizes of the flow grooves are consistent. In other embodiments, the second porous member 22 may also be provided with other numbers of flow grooves as the second flow channel 221, and the sizes and shapes of the flow grooves may also be different. Alternatively, the second porous member 22 may also be provided with through holes running through it as the second flow channel 221.

[0071] like Figure 2 As shown, the valve needle 50 of the electronic expansion valve is in a state of completely closing the valve port 11a. In the illustrated structural example, the valve needle 50 extends through the valve port 11a into the second valve chamber 13, and extends into the first circulation channel 211 of the first porous member 21. At this time, the first circulation channel 211 also serves as an avoidance hole for the valve needle 50 when the valve is fully closed.

[0072] In other embodiments, the first porous member 21 may also be provided with through holes at other positions to form the first circulation channel 211, or a circulation groove may be provided like the second porous member 22 to form at least a portion of the first circulation channel 211. In this case, if the valve needle 50 will interfere with the first porous member 21 when fully closed, a blind hole may be provided at the center of the first porous member 21 to form an avoidance hole for avoiding the valve needle 50.

[0073] In this embodiment, the first porous member 21 and the second porous member 22 are separated by an annular pad 23 to form a first chamber 13a therebetween. 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. When specifically configured, the size of the annular pad 23 should be such that it does not affect the equivalent diameter of the porous member as much as possible while ensuring support for the first porous member 21.

[0074] In a specific application, the silencer 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 sealed and connected to the second valve chamber 13 in the circumferential direction, and the sleeve 24 is also connected to the valve body component 10 in an axial upper limit position to avoid displacement of related structures of the silencer component 20.

[0075] In a specific configuration, the outer peripheral wall of the sleeve 24 can be fitted with a portion of the cavity wall of the second valve cavity 13 in the circumferential direction, so that it can be ensured that all the refrigerant flows through the silencer component 20 .

[0076] As described above, after the sleeve 24 is provided, the silencer component 20 can be integrated into a whole, which is convenient for assembly with the valve body component 10 .

[0077] For easy assembly, the valve body component 10 is provided with a split structure, including a valve body 101 and a valve seat body 102. Taking the example in the figure, the valve port 11a, the first valve cavity 12 and part of the second valve cavity 13 are provided on the valve body 101, and part of the second valve cavity 13 and the first interface 14 are provided on the valve seat body 102. The valve body 101 has a first limit surface 111 facing downward, and the valve seat body 102 has a second limit surface 121 facing upward. The upper end surface of the sleeve 24 is abutted against the first limit surface 111 for limit, and the lower end surface of the sleeve 24 is abutted against the second limit surface 121 for limit.

[0078] Combination Figure 2 and Figure 3 In the specific configuration, the top wall of the first porous member 21 is flush with the upper end surface of the sleeve 24, so that part of the first limiting surface 111 can also press against the first porous member 211, and in combination with the annular gasket 23, the axial position of the first porous member 211 in the sleeve 24 can be limited, avoiding the need for an additional axial limiting structure between the first porous member 211 and the sleeve 24. Similarly, the second porous member 22 can also be supported by the second limiting surface 121, and in combination with the annular gasket 23, its axial position in the sleeve 24 can be limited.

[0079] It should be understood that in other embodiments, when there are more than three porous parts in the silencer component 20, two adjacent porous parts are separated by an annular pad, the porous part located at the top can be abutted against the first limiting surface 111 for limiting position, and the porous part located at the bottom can be supported by the second limiting surface 121.

[0080] During actual assembly, the silencer component 20 must be installed in the valve body 101 before the valve body 101 and the valve seat body 102 can be relatively fixed. Usually, the valve body 101 and the valve seat body 102 are fixed by welding, generally by brazing. In order to prevent the solder from penetrating into the porous part of the silencer component 20 and affecting the microporous structure of the porous part when the valve body 101 and the valve seat body 102 are welded, the lower end of the sleeve 24 has a bending portion 241 bent radially inward. At this time, the second porous part 22 (the porous part located at the bottom) can be supported by the bending portion 241. During assembly, the bending portion 241 of the sleeve 24 is limited against the second limiting surface 121 of the valve seat body 102. Under the wrapping effect of the sleeve 24, the solder when the valve seat body 102 and the valve body 101 are welded can be prevented from entering the interior of the porous part.

[0081] refer to Figure 8 , Figure 8 for Figure 1 A partial enlarged view of the valve port of the Zhongdian expansion valve when it is fully open.

[0082] like Figure 8 As shown, when the electronic expansion valve is in the fully open state, the valve needle 50 has not completely separated from the valve port 11a, and a truncated cone structure B is formed at the valve port 11a. At this time, the flow area when the valve is fully open is smaller than the diameter area of ​​the valve port 11a, and is actually the truncated cone area of ​​the structure B. That is to say, in this state, the maximum equivalent flow area of ​​the valve port 11a is not the diameter area of ​​the valve port 11a, but the truncated cone area of ​​the structure B.

[0083] In some embodiments, the valve needle 50 is set to be shorter. When the electronic expansion valve is in a fully open state, the valve needle 50 is completely separated from the valve port 11a. At this time, the maximum equivalent flow area of ​​the valve port 11a is its diameter area.

[0084] Based on this, the size setting of the relevant structure of the silencer component 20 can be determined according to the actual matching conditions between the valve port 11 a and the valve needle 50 .

[0085] Second embodiment:

[0086] Please refer to Figures 9 to 11 , Fig. 9 A cross-sectional schematic diagram of the muffler component in the second embodiment provided in the present application; Fig.10 for Fig. 9 A top view of Fig.11 for Fig. 9 Bottom view of .

[0087] In this embodiment, the silencer component 20' of the electronic expansion valve includes a first porous member 21', a second porous member 22, an annular gasket 23 and a sleeve 24, wherein the first porous member 21', the second porous member 22 and the annular gasket 23 are all arranged in the sleeve 24, and the annular gasket 23 is used to separate the first porous member 21' and the second porous member 22 to form a first chamber therebetween.

[0088] In this embodiment, the structures of the second porous member 22, the annular pad 23 and the sleeve 24 of the silencer component 20' are similar to those of the first embodiment. The assembly and matching relationship between the silencer component 20' and the valve body component 10 is also similar to that of the first embodiment. All of them can be understood by referring to the above description and will not be repeated here.

[0089] In this embodiment, the first porous member 21' and the second porous member 22 adopt a similar structure, and the first flow channel 211' is a structure of a plurality of flow grooves, and the flow grooves are formed by radially inward depression from the outer peripheral wall of the first porous member 21'. During assembly, the first flow channel 211' of the first porous member 21' and the second flow channel 221 of the second porous member 22 do not correspond to each other in the axial direction, but are staggered.

[0090] In the illustrated embodiment, the first porous member 21 ′ and the second porous member 22 both exemplarily illustrate the structure of three flow slots. In other embodiments, the specific shape, number and arrangement of the flow slots can be set as required.

[0091] The silencer component 20 ′ provided in this embodiment is suitable for a situation where the electronic expansion valve is in a fully closed state and the valve needle 50 and the silencer component 20 ′ do not interfere with each other.

[0092] Figure 1 and Figure 2 In the embodiment, when the electronic expansion valve is in the fully closed state, since the valve needle 50 is set relatively long, it will pass through the valve port 11a and interfere with the first porous member 21 of the muffler component 20. Therefore, in the aforementioned first embodiment, the first flow channel 211 of the first porous member 21 is set as a through-hole structure located in the middle, which can be used as a flow channel and can also avoid the valve needle 50. However, in some embodiments, when the electronic expansion valve is in the fully closed state, the valve needle 50 will not pass through the valve port 11a to extend into the second valve cavity 13, or even if it passes through the valve port 11a, it will not interfere with the first porous member 21 (the porous member located at the top). At this time, the porous member located at the top of the muffler component 20 does not need to be provided with an avoidance hole for avoiding the valve needle 50, so its structure can be adopted. Figures 9 and 10 The structure shown in .

[0093] It should be understood that when the valve needle 50 does not interfere with the first porous member 21, the muffler component 20 can also be used. Figure 3 The structure shown.

[0094] In this embodiment, after the silencer component 20' is assembled with the valve body component 10, a second chamber 13b is provided between the first porous component 21' and the valve port 11a, and a third chamber 13c is 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 of the aforementioned first embodiment and will not be repeated.

[0095] Third embodiment:

[0096] Please refer to Figures 12 to 16 , Fig.12 This is a schematic structural diagram of the silencer component in the third embodiment provided in the present application; Fig.13 for Fig.12 A schematic cross-sectional view of the muffler component shown; Fig.14 for Fig.12 A schematic diagram of the structure of the middle sleeve; Fig.15 for Fig.12 A schematic cross-sectional view of a middle separator; Fig.16 for Fig.15 Bottom view of the divider shown.

[0097] In this embodiment, the silencer component 20'' of the electronic expansion valve includes a first porous member 21, a second porous member 22', a sleeve 24' and a partition 25, wherein the first porous member 21, the second porous member 22' and the partition 25 are all arranged inside the sleeve 24', and the partition 25 is used to separate the first porous member 21 and the second porous member 22' to form a first chamber therebetween.

[0098] Compared with the first embodiment, in this embodiment, the sleeve 24', the partition 25 and the second porous member 22' have different structural configurations, and the corresponding flow channel S2 of the electronic expansion valve is also different. The differences are described in detail below.

[0099] The main structure of the electronic expansion valve can be referred to Figure 1 and Figure 2 It is understood that the first porous member 21 of the silencer component 20'' has a first circulation channel 211, a gap is provided between the second porous member 22' and the cavity wall of the second valve cavity 13, the partition 25 has a connecting hole 2511, and the connecting hole 2511 is used to connect the first circulation channel 211 and the gap, and the flow channel S2 of the electronic expansion valve includes the first circulation channel 211, the connecting hole 2511 and the gap, and in the projection plane perpendicular to the axial direction of the valve body component 10, the projection of the first circulation channel 211 does not overlap with the projection of the connecting hole 2511, so as to avoid the refrigerant flowing through the first circulation channel 211 from directly flowing through the connecting hole 2511.

[0100] As described above, part of the structure of the flow channel S2 corresponding to the silencer component 20 is formed inside the first porous member 21, and part of the structure is formed between the second porous member 22' and the second valve chamber 13. In this way, the second porous member 22' may not be provided with a flow channel, and the entire structure is a microporous structure.

[0101] In the specific configuration, the wall of the sleeve 24 ′ completely covers the first porous member 21 , and the wall of the sleeve 24 ′ has an opening 242 ′ at a position corresponding to the second porous member 22 ′, so as to form the aforementioned gap between the second porous member 22 ′ and the wall of the second valve chamber 13 .

[0102] For example, Fig.14 As shown, the portion of the sleeve 24' wall near the bottom is provided with four openings 242' along the circumferential direction, and the four openings 242' are evenly arranged along the circumference of the sleeve 24'. After assembly, the second porous member 22' has gaps between the positions of these openings 242' and the second valve chamber 13, and the flow area of ​​the flow channel S2 corresponding to this portion is the sum of the flow areas of all the gaps, and its size requirement is still consistent with the aforementioned first embodiment, which will not be repeated here.

[0103] Accordingly, in order to prevent the solder from entering the microporous structure of the silencer component 20'' when the valve body 101 and the valve seat body 102 are welded after the silencer component 20'' is assembled, a bending portion 241' is also provided at the lower end of the sleeve 24'. Compared with the annular bending portion 241 in the first embodiment, due to the setting of the opening 242' of the sleeve 24' in this example, the bending portions 241' are discontinuous.

[0104] The limiting matching structure between the silencer component 20 ″ and the valve body component 10 is similar to that of the first embodiment, and will not be repeated here.

[0105] Fig.13 In the figure, the direction in which the refrigerant flows toward the first interface 14 is still taken as an example, and arrows are used to indicate the flow direction of the refrigerant in the flow channel S2.

[0106] In the specific setting, the separator 25 includes a ring body 251, and the ring body 251 is an annular structure. Its outer peripheral wall extends axially upward to form an upper protrusion 252, and its inner peripheral wall extends axially downward to form a lower protrusion 253. The upper protrusion 252 and the lower protrusion 253 are respectively against the first porous member 21 and the second porous member 22'. The aforementioned connecting hole 2511 is arranged on the ring body 251. In this way, when the first porous member 21 and the second porous member 22' are blocked and the refrigerant cannot flow, the refrigerant can flow from the first circulation 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 flow out from the first interface 14; when the first interface 14 is used as the refrigerant inlet end, the refrigerant flow direction is opposite to the previous one.

[0107] For example, a plurality of connecting holes 2511 may be provided along the circumference of the ring body 251. Fig.16 shown.

[0108] In the illustrated example, the structure of the first porous member 21 is consistent with the aforementioned first embodiment. It can be understood that in other embodiments, the first flow channel 211 of the first porous member 21 can also be set at other positions axially offset from the connecting hole 2511.

[0109] In other embodiments, the connecting hole 2511 may also be provided to at least partially penetrate the upper convex portion 252 or the lower convex portion 253 .

[0110] In this embodiment, after the silencer 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 of the aforementioned first embodiment and will not be repeated.

[0111] Fourth Example:

[0112] Please refer to Fig.17 , Fig.17 It is a partial cross-sectional schematic diagram of the electronic expansion valve in the fourth embodiment provided in the present application.

[0113] In this embodiment, the silencer component 20 of the electronic expansion valve includes a first porous member 21, a second porous member 22 and an annular gasket 23. The annular gasket 23 is used to separate the first porous member 21 and the second porous member 22 to form a first chamber 13a therebetween.

[0114] The difference from the aforementioned first embodiment is that the silencer component 20 of this embodiment is not provided with a sleeve, and the outer peripheral walls of the first porous member 21, the second porous member 22 and the annular pad 23 are directly in contact and cooperate with the second valve chamber 13, the upper end surface of the first porous member 21 is abutted against the first limiting surface 111 for limiting, and the lower end surface of the second porous member 22 is abutted against the second limiting surface 121 for limiting.

[0115] To facilitate the assembly of the silencer component 20, the structural composition of the valve body component 10 is similar to that of the aforementioned first embodiment, and also includes a valve body 101 and a valve seat body 102. In this embodiment, in order to prevent the solder from entering the microporous structure of the silencer component 20 when welding the valve body 101 and the valve seat body 102, a gap K is provided between the valve body 101 and the valve seat body 102 for accumulating the solder.

[0116] In the specific configuration, the upper end of the valve seat body 102 has an annular boss 122 extending axially upward, the upper surface of the annular boss 122 forms the aforementioned second limiting surface 121 , and a gap K is defined between the outer peripheral wall of the annular boss 122 and the valve body 101 .

[0117] In this embodiment, other structural arrangements of the electronic expansion valve and the specific structural arrangements of the first porous member 21 and the second porous member 22 can be understood by referring to the aforementioned embodiments and will not be repeated here.

[0118] The above embodiments are all described by taking the silencer component having two porous parts as an example. It can be understood that, based on the above embodiments, the silencer component can also be provided with more than three porous parts. The idea of ​​the related structure is consistent with the above embodiments and will not be described in detail one by one.

[0119] The electronic expansion valve provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. Electronic expansion valve, characterized in that: Including valve body parts and silencer parts; The valve body component has a valve port, a first valve cavity, a second valve cavity and a first interface, the first valve cavity is connected with the second valve cavity through the valve port, the first interface is directly connected with the second valve cavity, and the first valve cavity is located above the second valve cavity; The muffler component is located in the second valve cavity, and includes a sleeve and two or more porous components, each of which is installed inside the sleeve, the sleeve is sealed and connected to the second valve cavity in the circumferential direction, and the sleeve is connected to the valve body component in the axial upper limit direction; The porous parts are arranged along the axial direction of the valve body component, and each of the porous parts is provided with a circulation channel. In the projection plane perpendicular to the axial direction of the valve body component, the projections of the circulation channels of two adjacent porous parts do not overlap; the valve port can be connected to the first interface through each of the circulation channels.

2. The electronic expansion valve according to claim 1, characterized in that: The lower end of the sleeve has a bent portion bent radially inward, and the porous member located at the bottom is supported by the bent portion.

3. The electronic expansion valve according to claim 1, characterized in that: The valve body component has a first limit surface facing downward and a second limit surface facing upward. The upper end surface of the sleeve abuts against the first limit surface, and the lower end surface of the sleeve abuts against the second limit surface.

4. The electronic expansion valve according to claim 3, characterized in that: The upper end surface of the porous member located at the top is flush with the upper end surface of the sleeve, and the upper end surface of the porous member located at the top is also in contact with the first limiting surface.

5. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: A first chamber is provided between two adjacent porous members, the flow channel is communicated with the first chamber, a second chamber is provided between the uppermost porous member and the valve port, and a third chamber is provided between the lowermost porous member and the first interface.

6. The electronic expansion valve according to claim 5, characterized in that: The first chamber has a first axial dimension L1, 0.3 mm ≤ L1 ≤ 5 mm; the second chamber has a second axial dimension L2, L2 ≥ 0.3 mm.

7. The electronic expansion valve according to claim 5, characterized in that: The maximum diameter of the second chamber is not less than 1.1 times the diameter of the valve port.

8. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: The electronic expansion valve comprises a valve needle, and the valve needle can move up and down along the axial direction of the valve body component to open or close the valve port; The porous member located at the top has an avoidance hole, which corresponds to the valve port in the axial direction. When the valve needle closes the valve port, at least a part of the valve needle is located in the avoidance hole.

9. The electronic expansion valve according to claim 8, characterized in that: The flow channel of the porous member located at the top is an axial through hole, the center line of the axial through hole coincides with the center line of the valve port, and the axial through hole forms the avoidance hole.

10. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: The electronic expansion valve also includes a first connecting pipe, which is connected to the first interface, and the equivalent diameter of at least one of the porous components is larger than the inner diameter of the first connecting pipe; or, the equivalent diameter of at least one of the porous components is larger than twice the diameter of the valve port.

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