Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve which comprises a valve seat assembly, a first valve needle assembly, a second valve needle assembly and a silencing circulation piece, and a valve seat cavity, a large valve port and a second circulation hole communicated with the valve seat cavity are formed in the valve seat assembly. A small valve port is formed in the first valve needle assembly; the second valve needle assembly is used for controlling opening and closing of the small valve port and controlling movement of the first valve needle assembly. The first valve needle assembly is used for controlling opening and closing of the large valve port; wherein the noise reduction circulation piece is fixedly arranged at the end, close to the large valve port, of the small valve port, a plurality of through holes are formed in the noise reduction circulation piece, and the through holes communicate with the large valve port and the small valve port correspondingly so as to conduct flow division and noise reduction on fluid circulating between the large valve port and the small valve port. According to the utility model, the fluid can be effectively shunted by the plurality of through holes when passing through the silencing circulation piece, so that the noise of the fluid during flowing is reduced, the noise of the switching valve of the electronic expansion valve is reduced, and the use comfort of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an electronic expansion valve. Background Art

[0002] At present, electronic expansion valves are usually used to regulate the flow of fluids in various refrigeration and heating equipment such as air conditioners, refrigerators, and heat pump water heaters. In addition, electronic expansion valves can also be used as pilot valves in solenoid valves. The basic working principle is to regulate the gas / liquid flow by controlling the opening of the electronic expansion valve, thereby realizing system functions and achieving the purpose of precise control.

[0003] The electronic expansion valve in the prior art will produce obvious throttling when the flow space of the fluid becomes smaller (for example, when the valve opening is small during the process from complete closure of the valve port to flow regulation). When the fluid flows through the valve port, the flow velocity will increase due to throttling, and abnormal noise will be generated due to the appearance of vortices of a specific frequency, affecting the user's comfort. For example, when the electronic expansion valve is used in refrigeration equipment, the refrigerant in the refrigeration equipment is usually in gas-liquid state, so that there will be a large number of bubbles in the refrigerant. When the refrigerant in this state flows through the existing electronic expansion valve, the bubbles will burst in large numbers at the throttling point of the valve port, thereby generating a large amount of refrigerant noise, making the noise during the overall operation of the refrigeration equipment higher, reducing the user experience. Utility Model Content

[0004] The utility model provides an electronic expansion valve to solve the problem of relatively large noise when the electronic expansion valve in the prior art is switched on and off.

[0005] In order to solve the above problems, the utility model provides an electronic expansion valve, including a valve seat assembly, a first valve needle assembly, a second valve needle assembly and a silencer circulation member, the valve seat assembly has a valve seat cavity inside; the valve seat assembly also has a large valve port and a second circulation hole connected to the valve seat cavity; the first valve needle assembly has a small valve port connected to the large valve port inside; the second valve needle assembly is used to control the opening and closing of the small valve port, and is connected to the second circulation hole when the small valve port is open; the first valve needle assembly is used to control the opening and closing of the large valve port, and is connected to the second circulation hole when the large valve port is open; wherein the inner diameter of the small valve port is smaller than the inner diameter of the large valve port; the silencer circulation member is fixedly arranged at one end of the small valve port close to the large valve port, the silencer circulation member has a plurality of through holes, and the plurality of through holes are respectively connected to the large valve port and the small valve port, so as to divert and reduce noise of the fluid flowing between the large valve port and the small valve port.

[0006] Furthermore, the valve seat assembly also has a first flow hole connected to the valve seat cavity, and the large valve port is located in the valve seat cavity; the first valve needle assembly has a first valve needle cavity extending axially therethrough, and the small valve port is connected to one end of the first valve needle cavity close to the first flow hole, and the first valve needle cavity is connected to the second flow hole; and a silencer flow component is arranged at one end of the first valve needle cavity close to the first flow hole.

[0007] Furthermore, a third seal is provided between the first valve needle assembly and the valve seat assembly, and the first valve needle assembly is sealed and cooperated with the valve seat assembly through the third seal; the valve seat cavity includes a first back pressure cavity, and the first back pressure cavity and the second flow hole are respectively located on both sides of the third seal in the axial direction, and the first back pressure cavity is connected to the large valve port.

[0008] Furthermore, a fourth seal is provided between the second valve needle assembly and the first valve needle assembly, and the second valve needle assembly is sealed and cooperated with the first valve needle assembly through the fourth seal; a flow port is provided in the first valve needle assembly, and the flow port is connected with the first valve needle chamber; the first valve needle chamber includes a second back pressure chamber, and the second back pressure chamber and the flow port are respectively located on both sides of the fourth seal in the axial direction, and the second back pressure chamber is connected with the small valve port.

[0009] Furthermore, the second valve needle assembly has a second valve needle cavity inside, and the second back pressure cavity is connected to the second valve needle cavity; the first back pressure cavity is connected to the second back pressure cavity, and the second valve needle cavity is connected to both the small valve port and the large valve port.

[0010] Furthermore, multiple through holes are distributed at intervals on the silencer circulation component, and the central axes of the multiple through holes are respectively parallel to or colinear with the central axis of the silencer circulation component; the multiple through holes include a middle hole and multiple surrounding holes, and the central axis of the middle hole is colinear with the central axis of the silencer circulation component; the multiple surrounding holes surround the middle hole and are evenly distributed along the circumferential direction of the middle hole.

[0011] Furthermore, the inner diameter of the middle hole is larger than the inner diameter of the surrounding holes, and the inner diameter of the middle hole is smaller than the inner diameter of the small valve port; or, the inner diameter of the middle hole is smaller than the inner diameter of the surrounding holes, and the inner diameter of the surrounding holes is smaller than the inner diameter of the small valve port.

[0012] Furthermore, the silencer circulation component has a groove on at least one axial end face, and the through hole penetrates the bottom wall of the groove in the axial direction; wherein the axial projection size of the groove is larger than the axial projection size of the small valve port, and smaller than the axial projection size of the large valve port.

[0013] Furthermore, the two ends of the silencer flow component in the axial direction each have a slot, and the axial projections of the two slots on the two ends overlap; one end of the through hole penetrates the bottom wall of the slot at one end of the silencer flow component in the axial direction, and the other end of the through hole penetrates the bottom wall of the slot at the other end of the silencer flow component in the axial direction.

[0014] Furthermore, the first valve needle assembly includes a main valve needle body and a second sealing member, and the main valve needle body is movably arranged in the valve seat cavity; the first valve needle cavity is located in the main valve needle body, and the small valve port is located in the second sealing member; one end of the second sealing member abuts against the inner wall of the first valve needle cavity, and the other end abuts against the silencer flow member.

[0015] Furthermore, the abutting end of the silencer circulation component and the second sealing component has a groove, and the through hole penetrates the bottom wall of the groove in the axial direction. The circumferential size of the groove is larger than the inner diameter of the small valve port and smaller than the outer circumferential size of the second sealing component.

[0016] Applying the technical scheme of the utility model, the utility model provides an electronic expansion valve, including a valve seat assembly, a first valve needle assembly, a second valve needle assembly and a silencer circulation member, the valve seat assembly has a valve seat cavity inside; the valve seat assembly also has a large valve port and a second circulation hole connected to the valve seat cavity; the first valve needle assembly has a small valve port connected to the large valve port inside; the second valve needle assembly is used to control the opening and closing of the small valve port, and is connected to the second circulation hole when the small valve port is open; the first valve needle assembly is used to control the opening and closing of the large valve port, and is connected to the second circulation hole when the large valve port is open; wherein the inner diameter of the small valve port is smaller than the inner diameter of the large valve port; the silencer circulation member is fixedly arranged at one end of the small valve port close to the large valve port, the silencer circulation member has a plurality of through holes, and the plurality of through holes are respectively connected to the large valve port and the small valve port, so as to divert and reduce noise of the fluid flowing between the large valve port and the small valve port.

[0017] The utility model ensures that the fluid can be effectively diverted by the multiple through holes when passing through the silencer flow member, thereby reducing the noise of the fluid when flowing, reducing the noise of the electronic expansion valve switch valve, and improving the user's comfort; by fixing the silencer flow member at one end of the small valve port close to the large valve port, the silencer flow member is located at the position where the electronic expansion valve is prone to generate abnormal noise, thereby ensuring the diversion and noise reduction effect; the electronic expansion valve proposed in the utility model is an internal balancing valve, that is, it ensures that the pressure inside the second valve needle assembly is balanced with the pressure of the first flow hole and the large valve port, thereby enabling the electronic expansion valve to achieve a certain expansion valve function when the large valve port is closed; the electronic expansion valve proposed in the utility model can be used in refrigeration equipment, and the refrigerant in the refrigeration equipment will be diverted when flowing through the silencer flow member of the electronic expansion valve, so that the volume of bubbles contained in the refrigerant is greatly reduced, and the sound of bubble bursting in the refrigerant is significantly reduced, thereby reducing the working noise of the entire refrigeration equipment and improving the user's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the internal structure of an electronic expansion valve provided in an embodiment of the utility model is shown;

[0020] Figure 2 A schematic diagram showing the internal structure of a partial structure of an electronic expansion valve provided in an embodiment of the utility model is shown;

[0021] Figure 3 The external structure schematic diagram of the first valve needle assembly, the second valve needle assembly and the muffler flow member provided in the embodiment of the utility model is shown;

[0022] Figure 4 The figure shows the external structure of the sound-absorbing circulation member provided by the embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the internal structure of a sound-absorbing circulation member provided in an embodiment of the utility model is shown.

[0024] The above drawings include the following reference numerals:

[0025] 10. Valve seat assembly; 11. Valve seat cavity; 111. First back pressure cavity; 12. Large valve port; 13. First flow hole; 14. Second flow hole;

[0026] 20. First valve needle assembly; 21. First valve needle chamber; 211. Second back pressure chamber; 22. Small valve port; 23. Main valve needle body; 24. Second sealing element; 25. Flow port;

[0027] 30. Second valve needle assembly; 31. Second valve needle chamber;

[0028] 40. Silencer circulation part; 41. Through hole; 411. Middle hole; 412. Surrounding hole; 42. Slot;

[0029] 50. a first sealing member;

[0030] 60. The third sealing member;

[0031] 70. Fourth seal. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0033] like Figures 1 to 5 As shown, an embodiment of the utility model provides an electronic expansion valve, including a valve seat assembly 10, a first valve needle assembly 20, a second valve needle assembly 30 and a muffler circulation member 40, wherein the valve seat assembly 10 has a valve seat cavity 11 inside; the valve seat assembly 10 also has a large valve port 12 and a second circulation hole 14 communicating with the valve seat cavity 11; the first valve needle assembly 20 has a small valve port 22 communicating with the large valve port 12 inside; the second valve needle assembly 30 is used to control the opening and closing of the small valve port 22, and the small valve port 22 is communicated with the second circulation hole 14 when it is opened, and Control the movement of the first valve needle assembly 20; the first valve needle assembly 20 is used to control the opening and closing of the large valve port 12, and is connected to the second flow hole 14 when the large valve port 12 is open; wherein the inner diameter of the small valve port 22 is smaller than the inner diameter of the large valve port 12; the silencer flow component 40 is fixedly arranged at one end of the small valve port 22 close to the large valve port 12, and the silencer flow component 40 has a plurality of through holes 41, and the plurality of through holes 41 are respectively connected to the large valve port 12 and the small valve port 22, so as to divert and reduce noise of the fluid flowing between the large valve port 12 and the small valve port 22.

[0034] The utility model ensures that the fluid can be effectively diverted by the multiple through holes 41 when passing through the muffler circulation member 40, thereby reducing the noise of the fluid when flowing, reducing the noise of the electronic expansion valve switch valve, and improving the user's comfort; by fixing the muffler circulation member 40 at one end of the small valve port 22 close to the large valve port 12, the muffler circulation member 40 is located at a position where the electronic expansion valve is prone to abnormal noise, thereby ensuring the diversion noise reduction effect; the electronic expansion valve proposed in the utility model is an internal balancing valve, that is, it ensures that the pressure inside the second valve needle assembly 30 is balanced with the pressure of the first flow hole 13 and the large valve port 12, thereby enabling the electronic expansion valve to achieve a certain expansion valve function when the large valve port 12 is closed; the electronic expansion valve proposed in the utility model can be used in refrigeration equipment, and the refrigerant in the refrigeration equipment will be diverted when flowing through the muffler circulation member 40 of the electronic expansion valve, so that the volume of bubbles contained in the refrigerant is greatly reduced, and the sound of bubble rupture in the refrigerant is significantly reduced, thereby reducing the working noise of the entire refrigeration equipment and improving the user's comfort.

[0035] like Figure 1 As shown, the valve seat assembly 10 also has a first flow hole 13 connected to the valve seat cavity 11, and the large valve port 12 is located in the valve seat cavity 11; the first valve needle assembly 20 has a first valve needle cavity 21 that penetrates along the axial direction, and the small valve port 22 is connected to one end of the first valve needle cavity 21 close to the first flow hole 13, and the first valve needle cavity 21 is connected to the second flow hole 14; the second valve needle assembly 30 opens and closes the small valve port 22; the first valve needle assembly 20 opens and closes the large valve port 12. The silencer circulation member 40 is arranged at one end of the first valve needle cavity 21 close to the first flow hole 13. This arrangement not only ensures the working reliability of the electronic expansion valve, but also simplifies the internal structure of the electronic expansion valve.

[0036] It should be noted that: in the actual use of the electronic expansion valve, the fluid flows in from the first flow hole 13 and the large valve port 12 of the valve seat assembly 10 in turn, and flows out from the second flow hole 14. There is no obvious throttling phenomenon when the fluid flows through the large valve port 12, so basically no noise is generated. However, when the fluid passes through the large valve port 12 and the small valve port 22 in turn and enters the second valve needle chamber 31, the small valve port 22 has a smaller diameter and will throttle the fluid, thereby causing the fluid to generate noise. Therefore, a silencer structure for silencing and reducing noise needs to be provided at the small valve port 22. The silencer circulation member 40 in the utility model is fixedly arranged at one end of the first valve needle chamber 21 close to the first flow hole 13, and a plurality of through holes 41 are respectively connected to the first flow hole 13 and the small valve port 22.

[0037] like Figure 1 As shown, the second valve needle assembly 30 has a second valve needle chamber 31 inside, and the second valve needle chamber 31 is communicated with the first flow hole 13 and the balance chamber of the second valve needle assembly 30 (the balance chamber can achieve pressure balance in the axial direction of the second valve needle assembly 30, so as to facilitate the axial movement of the second valve needle assembly 30; including the first back pressure chamber 111 and the second back pressure chamber 211); the second flow hole 14 is arranged on the side of the valve seat assembly 10, and passes through the valve seat chamber 11; the electronic expansion valve also includes a first sealing member 50, the large valve port 12 is located on the first sealing member 50, and the first sealing member 50 is located in the valve seat chamber 11; the first valve needle assembly 20 closes the large valve port 12 by sealing with the first sealing member 50. By providing the first sealing member 50, the reliable opening and closing of the large valve port 12 by the first valve needle assembly 20 is ensured. By setting the second valve needle chamber 31 to be connected with the first flow hole 13 and the balance chamber of the second valve needle assembly 30 respectively, the pressure of the fluid on both ends of the valve needle in the second valve needle assembly 30 can be kept balanced at all times, thereby ensuring smooth switching of the second valve needle assembly 30 and improving working reliability and stability.

[0038] It should be noted that: in a specific embodiment of the present invention, in order to achieve precise regulation of small fluid flow rates and regulation of large fluid flow rates by the electronic expansion valve, the second valve needle chamber 31 and the related balancing chamber channel may not be provided if necessary, and can be flexibly provided according to actual use requirements, so as to simplify the overall structure of the electronic expansion valve as much as possible while ensuring working reliability.

[0039] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the silencer circulation member 40 is a circular gasket structure, and a plurality of through holes 41 are spaced apart on the silencer circulation member 40, and the central axes of the plurality of through holes 41 are respectively parallel or co-linear with the central axis of the silencer circulation member 40. This arrangement not only ensures the working reliability of the silencer circulation member 40, but also makes the silencer circulation member 40 convenient for integral molding and subsequent processing, and also facilitates the installation of the silencer circulation member 40 in the first valve needle chamber 21.

[0040] Optionally, in a specific embodiment of the present invention, the silencer flow member 40 is made of metal material to facilitate processing and reduce costs.

[0041] The specific working process of the electronic expansion valve proposed by the utility model is now described in detail as follows: the electronic expansion valve has a closed state, a flow regulation state and a fully open state; in the closed state, the second valve needle assembly 30 blocks the small valve port 22, and the small valve port 22 is not connected to the second flow hole 14, and the first valve needle assembly 20 blocks the large valve port 12, and the large valve port 12 and the second flow hole 14 are not connected at this time; in the flow regulation state, the first valve needle assembly 20 blocks the large valve port 12, and the second valve needle assembly 30 adjusts the opening of the small valve port 22 by axial movement, and the large valve port 12 is connected to the second flow hole 14 through the small valve port 22; in the fully open state, the first valve needle assembly 20 opens the large valve port 12, and the large valve port 12 is directly connected to the second flow hole 14, thereby realizing reliable regulation of large flow of fluid.

[0042] like Figure 4 and Figure 5 As shown, the multiple through holes 41 include a middle hole 411 and multiple surrounding holes 412. The central axis of the middle hole 411 is collinear with the central axis of the muffler circulation member 40. The multiple surrounding holes 412 surround the middle hole 411 and are evenly distributed along the circumferential direction of the middle hole 411. This arrangement structurally ensures the uniform distribution of the multiple through holes 41, which can increase the flow area of ​​the fluid at the position of the muffler circulation member 40 and make the distribution of the multiple through holes 41 reasonable. In actual use, the sizes of the middle hole 411 and the surrounding holes 412 can be flexibly set according to actual use requirements to improve applicability.

[0043] like Figure 2 , Figure 4 and Figure 5 As shown, the inner diameter of the middle hole 411 is larger than the inner diameter of the surrounding hole 412, and the inner diameter of the middle hole 411 is smaller than the inner diameter of the small valve port 22; or, the inner diameter of the middle hole 411 is smaller than the inner diameter of the surrounding hole 412, and the inner diameter of the surrounding hole 412 is smaller than the inner diameter of the small valve port 22. By setting the inner diameters of the middle hole 411 and the surrounding hole 412 to be smaller than the inner diameter of the small valve port 22, the middle hole 411 and the surrounding hole 412 have a flow diversion and noise reduction effect on the fluid.

[0044] In actual use, it is found that the scheme of setting the inner diameter of the middle hole 411 to be larger than the inner diameter of the surrounding hole 412 is the first scheme, and the scheme of setting the inner diameter of the middle hole 411 to be smaller than the inner diameter of the surrounding hole 412 is the second scheme. By comparing the first scheme and the second scheme, it can be found that: the flow resistance of the fluid in the first scheme is smaller, that is, the design of the first scheme has less influence on the normal and smooth flow of the fluid, but the diversion effect on the fluid is also weaker; while the flow resistance of the fluid in the second scheme is larger (compared with the first scheme), the design of the second scheme has a greater influence on the normal and smooth flow of the fluid, but the diversion effect on the fluid is stronger; therefore, the noise reduction effect of the second scheme is stronger than that of the first scheme, and the flow resistance of the first scheme is smaller than that of the second scheme. The first scheme or the second scheme can be flexibly selected according to the dynamic needs between actual noise reduction and flow smoothness.

[0045] like Figure 4 and Figure 5 As shown, the silencer circulation member 40 has a slot 42 at least on one axial end face, and the through hole 41 penetrates the bottom wall of the slot 42 in the axial direction; wherein the axial projection size of the slot 42 is larger than the axial projection size of the small valve port 22, and smaller than the axial projection size of the large valve port 12. The provision of the slot 42 not only facilitates the subsequent precise positioning processing of the intermediate hole 411 and the surrounding hole 412, but also ensures that the silencer circulation member 40 is reliably fixed to the second sealing member 24 in the axial direction.

[0046] like Figure 4 and Figure 5 As shown, the two ends of the silencer circulation member 40 in the axial direction respectively have a slot 42, and the projections of the two slots 42 in the axial direction on the two ends overlap; one end of the through hole 41 penetrates the bottom wall of the slot 42 at one end of the silencer circulation member 40 in the axial direction, and the other end of the through hole 41 penetrates the bottom wall of the slot 42 at the other end of the silencer circulation member 40 in the axial direction. By providing two slots 42, and the projections of the two slots 42 in the axial direction on the two ends overlap, the silencer circulation member 40 does not need to distinguish the front and back sides and the installation direction of each end during installation, which facilitates the rapid installation of the staff.

[0047] like Figure 1 and Figure 2As shown, the first valve needle assembly 20 includes a main valve needle body 23 and a second sealing member 24, the main valve needle body 23 is movably arranged in the valve seat cavity 11; the first valve needle cavity 21 is located in the main valve needle body 23, the small valve port 22 is located on the second sealing member 24 and penetrates the second sealing member 24; the second sealing member 24 is arranged at one end of the first valve needle cavity 21 close to the first flow hole 13, and is circumferentially limited with the inner wall of the first valve needle cavity 21; wherein the circumference of the muffler circulation member 40 is fixedly connected with the inner wall of the first valve needle cavity 21; one end of the second sealing member 24 in the axial direction abuts against the inner wall of the first valve needle cavity 21, and the other end abuts against one end of the muffler circulation member 40 in the axial direction to axially fix the second sealing member 24. Such a configuration not only ensures the working reliability of the muffler circulation member 40, but also realizes the reliable fixation of the second sealing member 24.

[0048] In a specific embodiment of the present invention, the circumference of the silencer circulation member 40 is interference fit with the inner wall of the first valve needle cavity 21 so as to be fixed in the first valve needle cavity 21; it should also be noted that in order to ensure the reliable fixation of the silencer circulation member 40, welding, riveting and other methods can also be used for fixation when necessary.

[0049] like Figure 1 and Figure 2 As shown, the abutting end of the silencer circulation member 40 and the second sealing member 24 has a slot 42, and the through hole 41 penetrates the bottom wall of the slot 42 in the axial direction. The size of the slot 42 in the circumferential direction is larger than the inner diameter of the small valve port 22 and smaller than the outer circumferential size of the second sealing member 24; the slot 42 is chamfered to reduce the flow resistance. By setting the size of the slot 42 in the circumferential direction smaller than the outer circumferential size of the second sealing member 24, the end face of the silencer circulation member 40 is ensured to be closely abutted against the second sealing member 24, thereby realizing reliable fixation of the second sealing member 24; by setting the slot 42 to be chamfered, the occurrence of turbulence is effectively reduced, thereby ensuring the smooth flow of the fluid.

[0050] like Figure 1 and Figure 2 As shown, a third sealing member 60 is further provided between the first valve needle assembly 20 and the valve seat assembly 10, and the first valve needle assembly 20 is sealed and cooperated with the valve seat assembly 10 through the third sealing member 60; the valve seat cavity 11 comprises a first back pressure cavity 111, and the first back pressure cavity 111 and the second flow hole 14 are respectively located on both sides of the axial direction of the third sealing member 60, and the first back pressure cavity 111 is connected with the large valve port 12; by setting the first back pressure cavity 111 to be connected with the large valve port 12, the pressure balance can be achieved at both ends of the second valve needle assembly 30 in the axial direction, thereby facilitating the axial movement of the second valve needle assembly 30 and controlling the opening and closing of the small valve port 22.

[0051] like Figure 1 and Figure 2As shown, a fourth sealing member 70 is provided between the second valve needle assembly 30 and the first valve needle assembly 20, and the second valve needle assembly 30 is sealed and movably matched with the first valve needle assembly 20 through the fourth sealing member 70; the first valve needle assembly 20 has a flow port 25, and the first valve needle assembly 20 has a first valve needle chamber 21 that penetrates along the axial direction, and the flow port 25 is communicated with the first valve needle chamber 21; the first valve needle chamber 21 includes a second back pressure chamber 211, and the second back pressure chamber 211 and the flow port 25 are respectively located on both sides of the fourth sealing member 70 in the axial direction, and the second back pressure chamber 211 is communicated with the small valve port 22; the second valve needle assembly 30 has a second valve needle chamber 31, and the second back pressure chamber 211 is communicated with the second valve needle chamber 31. With this arrangement, the electronic expansion valve becomes an internal balancing valve, which can effectively ensure the smooth movement of the first valve needle assembly 20 and the second valve needle assembly 30.

[0052] In summary, the utility model provides an electronic expansion valve. The utility model ensures that the fluid can be effectively diverted by the multiple through holes 41 when passing through the silencer circulation member 40, thereby reducing the noise of the fluid when flowing, reducing the noise of the electronic expansion valve switch valve, and improving the user's comfort; by fixing the silencer circulation member 40 at one end of the small valve port 22 close to the large valve port 12, the silencer circulation member 40 is located at a position where the electronic expansion valve is prone to generate abnormal noise, thereby ensuring the diversion noise reduction effect; the utility model proposes The electronic expansion valve is an internal balancing valve, which ensures that the pressure inside the second valve needle assembly 30 is balanced with the pressure of the first flow hole 13 and the large valve port 12, so that the electronic expansion valve can achieve a certain expansion valve function when the large valve port 12 is closed; the electronic expansion valve proposed by the utility model can be used in refrigeration equipment, and the refrigerant in the refrigeration equipment will be diverted when flowing through the silencer flow component 40 of the electronic expansion valve, so that the volume of bubbles contained in the refrigerant is greatly reduced, and the sound of bubble bursting in the refrigerant is significantly reduced, thereby reducing the working noise of the entire refrigeration equipment and improving the user comfort.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0057] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electronic expansion valve, characterized in that: The invention comprises a valve seat assembly (10), a first valve needle assembly (20), a second valve needle assembly (30) and a silencer circulation member (40), wherein the valve seat assembly (10) has a valve seat cavity (11) inside; the valve seat assembly (10) also has a large valve port (12) and a second circulation hole (14) connected to the valve seat cavity (11); the first valve needle assembly (20) has a small valve port (22) connected to the large valve port (12); the second valve needle assembly (30) is used to control the opening and closing of the small valve port (22), and the small valve port (22) is connected to the second circulation hole (14) when it is open; the first valve needle assembly (20) is used to control the opening and closing of the large valve port (12), and the large valve port (12) is connected to the second circulation hole (14) when it is open; The inner diameter of the small valve port (22) is smaller than the inner diameter of the large valve port (12); the silencer circulation component (40) is fixedly arranged at one end of the small valve port (22) close to the large valve port (12); the silencer circulation component (40) has a plurality of through holes (41), and the plurality of through holes (41) are respectively connected to the large valve port (12) and the small valve port (22) to divert and reduce noise of the fluid flowing between the large valve port (12) and the small valve port (22).

2. The electronic expansion valve according to claim 1, characterized in that: The valve seat assembly (10) also has a first flow hole (13) connected to the valve seat cavity (11), and the large valve port (12) is located in the valve seat cavity (11); the first valve needle assembly (20) has a first valve needle cavity (21) extending axially therethrough, the small valve port (22) is connected to one end of the first valve needle cavity (21) close to the first flow hole (13), and the first valve needle cavity (21) is connected to the second flow hole (14); the silencer flow member (40) is arranged at one end of the first valve needle cavity (21) close to the first flow hole (13).

3. The electronic expansion valve according to claim 2, characterized in that: A third sealing member (60) is also provided between the first valve needle assembly (20) and the valve seat assembly (10), and the first valve needle assembly (20) is sealed and cooperated with the valve seat assembly (10) through the third sealing member (60); the valve seat cavity (11) includes a first back pressure cavity (111), and the first back pressure cavity (111) and the second flow hole (14) are respectively located on both sides of the third sealing member (60) in the axial direction, and the first back pressure cavity (111) is connected to the large valve port (12).

4. The electronic expansion valve according to claim 3, characterized in that: A fourth sealing member (70) is provided between the second valve needle assembly (30) and the first valve needle assembly (20), and the second valve needle assembly (30) is sealingly cooperated with the first valve needle assembly (20) through the fourth sealing member (70); a flow port (25) is provided in the first valve needle assembly (20), and the flow port (25) is communicated with the first valve needle chamber (21); the first valve needle chamber (21) includes a second back pressure chamber (211), and the second back pressure chamber (211) and the flow port (25) are respectively located on two sides of the fourth sealing member (70) in the axial direction, and the second back pressure chamber (211) is communicated with the small valve port (22).

5. The electronic expansion valve according to claim 4, characterized in that: The second valve needle assembly (30) has a second valve needle chamber (31) inside, and the second back pressure chamber (211) is connected to the second valve needle chamber (31); the first back pressure chamber (111) is connected to the second back pressure chamber (211), and the second valve needle chamber (31) is connected to both the small valve port (22) and the large valve port (12).

6. The electronic expansion valve according to any one of claims 1 to 5, characterized in that: The plurality of through holes (41) are spaced apart on the silencer circulation member (40), and the central axes of the plurality of through holes (41) are respectively parallel to or collinear with the central axis of the silencer circulation member (40); the plurality of through holes (41) include a middle hole (411) and a plurality of surrounding holes (412), and the central axis of the middle hole (411) is collinear with the central axis of the silencer circulation member (40); the plurality of surrounding holes (412) surround the middle hole (411) and are evenly distributed along the circumferential direction of the middle hole (411).

7. The electronic expansion valve according to claim 6, characterized in that: The inner diameter of the middle hole (411) is larger than the inner diameter of the surrounding hole (412), and the inner diameter of the middle hole (411) is smaller than the inner diameter of the small valve opening (22); or, the inner diameter of the middle hole (411) is smaller than the inner diameter of the surrounding hole (412), and the inner diameter of the surrounding hole (412) is smaller than the inner diameter of the small valve opening (22).

8. The electronic expansion valve according to claim 1, characterized in that: The silencer circulation component (40) has a groove (42) on at least one axial end face, and the through hole (41) penetrates the bottom wall of the groove (42) in the axial direction; wherein the axial projection size of the groove (42) is larger than the axial projection size of the small valve port (22) and smaller than the axial projection size of the large valve port (12).

9. The electronic expansion valve according to claim 8, characterized in that: The two axial ends of the silencer circulation member (40) are respectively provided with a slot (42), and the axial projections of the two slots (42) at the two ends overlap; one end of the through hole (41) penetrates the bottom wall of the slot (42) at one axial end of the silencer circulation member (40), and the other end of the through hole (41) penetrates the bottom wall of the slot (42) at the other axial end of the silencer circulation member (40).

10. The electronic expansion valve according to claim 2, characterized in that: The first valve needle assembly (20) includes a main valve needle body (23) and a second sealing member (24), wherein the main valve needle body (23) is movably arranged in the valve seat cavity (11); the first valve needle cavity (21) is located in the main valve needle body (23); the small valve port (22) is located in the second sealing member (24); one end of the second sealing member (24) abuts against the inner wall of the first valve needle cavity (21), and the other end abuts against the silencer circulation member (40).

11. The electronic expansion valve according to claim 10, characterized in that: The abutting ends of the silencer circulation member (40) and the second sealing member (24) have a groove (42), and the through hole (41) penetrates the bottom wall of the groove (42) in the axial direction. The circumferential dimension of the groove (42) is larger than the inner diameter of the small valve port (22) and smaller than the outer circumferential dimension of the second sealing member (24).

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