Electronic expansion valve

Abstract

An electronic expansion valve, comprising a valve seat component (10), a first valve needle component (20), a second valve needle component (30), and a silencing flow-through member (40). The valve seat component is internally provided with a valve seat cavity (11) and a first valve opening (12). The first valve needle component is internally provided with a second valve opening (22), and the second valve needle component is used for controlling the second valve opening to open / close and controlling the movement of the first valve needle component. The first valve needle component is used for controlling the first valve opening to open / close, the inner diameter of the second valve opening being smaller than the inner diameter of the first valve opening. The silencing flow-through member (40) is fixedly arranged at the end of the second valve opening close to the first valve opening, a plurality of through holes (41) being formed in the silencing flow-through member (40), and the plurality of through holes (41) communicating with the first valve opening (12) and the second valve opening (22) separately. The electronic expansion valve ensures that a fluid can be effectively separated by the plurality of through holes when the fluid passes through the silencing flow-through member, such that the noise generated during fluid flow is reduced, and the noise generated in opening / closing the electronic expansion valve is reduced, thereby improving the use comfort for users.

Description

Electronic expansion valve

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on January 23, 2024, with application number 202420172666.4 and title “Electronic Expansion Valve.” Technical Field

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

[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 rate 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 valve port throttling, thereby generating a large amount of refrigerant noise, making the noise during the overall operation of the refrigeration equipment higher, reducing the user experience.

[0004] Application Contents

[0005] The present application provides an electronic expansion valve to solve the problem in the prior art that the electronic expansion valve generates high noise when opening and closing the valve.

[0006] In order to solve the above problems, the present application provides an electronic expansion valve, including a valve seat assembly, a first valve needle assembly, a second valve needle assembly and a silencer flow member, the valve seat assembly has a valve seat cavity; at least part of the first valve needle assembly and at least part of the second valve needle assembly are located in the valve seat cavity; the valve seat assembly also has a first valve port; the first valve needle assembly has a second valve port connected to the first valve port; the second valve needle assembly is used to control the opening and closing of the second valve port; the first valve needle assembly is used to control the opening and closing of the first valve port; wherein the inner diameter of the second valve port is smaller than the inner diameter of the first valve port; the silencer flow member is fixedly arranged at one end of the second valve port close to the first valve port, and the silencer flow member has a plurality of through holes, and the plurality of through holes are respectively connected to the first valve port and the second valve port.

[0007] Furthermore, the valve seat assembly has a second flow hole connected to the valve seat cavity; the valve seat assembly also has a first flow hole connected to the valve seat cavity, the first valve port is located in the valve seat cavity and between the second flow hole and the first flow hole; the first valve needle assembly has a first valve needle cavity that penetrates axially inside, the second 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; the silencer flow component is arranged at one end of the first valve needle cavity close to the first flow hole.

[0008] 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 first valve port.

[0009] 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 movably 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 respectively connected with the second flow hole and 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 second valve port.

[0010] Furthermore, the second valve needle assembly has a second valve needle cavity inside, 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 second valve port and the first valve port.

[0011] Furthermore, multiple through holes are spaced apart on the silencer circulation component, and the central axes of the multiple through holes are respectively parallel to or collinear 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 collinear 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.

[0012] 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 second 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 second valve port.

[0013] Furthermore, the silencer flow member has a slot on at least one axial end face, and the through hole passes through both ends of the silencer flow member in the axial direction; wherein the size of the slot along the valve radial direction is larger than the size of the second valve port along the valve radial direction, and smaller than the size of the first valve port along the valve radial direction.

[0014] Furthermore, the two ends of the silencer flow member in the axial direction each have a slot, and the projections of the two slots on the two ends on the radial cross section of the valve coincide; the through hole passes through the two ends of the silencer flow member in the axial direction.

[0015] 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 second 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 circulation member.

[0016] Furthermore, the abutting end of the silencer circulation member and the second sealing member has a groove, and the through hole penetrates the bottom wall of the groove in the axial direction. The radial size of the groove along the valve is larger than the inner diameter of the second valve port and smaller than the outer diameter of the second sealing member.

[0017] Applying the technical solution of the present application, the present application provides an electronic expansion valve, including a valve seat assembly, a first valve needle assembly, a second valve needle assembly and a silencer flow component, the valve seat assembly has a valve seat cavity inside; at least part of the first valve needle assembly and at least part of the second valve needle assembly are located in the valve seat cavity; the valve seat assembly also has a first valve port; the first valve needle assembly has a second valve port connected to the first valve port; the second valve needle assembly is used to control the opening and closing of the second valve port; the first valve needle assembly is used to control the opening and closing of the first valve port; wherein the inner diameter of the second valve port is smaller than the inner diameter of the first valve port; the silencer flow component is fixedly arranged at one end of the second valve port close to the first valve port, and the silencer flow component has a plurality of through holes, and the plurality of through holes are respectively connected to the first valve port and the second valve port.

[0018] The present application 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 during flow, reducing the noise of the electronic expansion valve switch, and improving user comfort; by fixing the silencer flow member at one end of the second valve port close to the first valve port, the silencer flow member is located at a 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 present application 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 first valve port, thereby enabling the electronic expansion valve to achieve a certain expansion valve function when the first valve port is closed; the electronic expansion valve proposed in the present application can be used in refrigeration equipment. When the refrigerant in the refrigeration equipment flows through the silencer flow member of the electronic expansion valve, it will be diverted, so that the volume of bubbles contained in the refrigerant is greatly reduced, significantly reducing the sound of the bubbles bursting in the refrigerant, thereby reducing the working noise of the entire refrigeration equipment and improving user comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0020] FIG1 shows a schematic diagram of the internal structure of an electronic expansion valve provided in an embodiment of the present application;

[0021] FIG2 is a schematic diagram showing the internal structure of a partial structure of an electronic expansion valve provided in an embodiment of the present application;

[0022] FIG3 shows a schematic diagram of the external structure of the first valve needle assembly, the second valve needle assembly and the muffler flow member provided in an embodiment of the present application;

[0023] FIG4 shows a schematic diagram of the external structure of a sound-absorbing circulation member provided in an embodiment of the present application;

[0024] FIG5 shows a schematic diagram of the internal structure of the silencer flow member provided in an embodiment of the present application.

[0025] Among them, the above-mentioned drawings include the following figure marks: 10, valve seat assembly; 11, valve seat cavity; 111, first back pressure cavity; 12, first valve port; 13, first flow hole; 14, second flow hole; 20, first valve needle assembly; 21, first valve needle cavity; 211, second back pressure cavity; 22, second valve port; 23, main valve needle body; 24, second sealing member; 25, flow port; 30, second valve needle assembly; 31, second valve needle cavity; 40, silencer flow member; 41, through hole; 411, middle hole; 412, surrounding hole; 42, slot; 50, first sealing member; 60, third sealing member; 70, fourth sealing member. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] As shown in Figures 1 to 5, an embodiment of the present application 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 flow member 40. The valve seat assembly 10 has a valve seat cavity 11 inside; at least part of the first valve needle assembly 20 and at least part of the second valve needle assembly 30 are located in the valve seat cavity 11; the valve seat assembly 10 also has a first valve port 12; the first valve needle assembly 20 has a second valve port 22 connected to the first valve port 12; the second valve needle assembly 30 is used to For controlling the opening and closing of the second valve port 22; the first valve needle assembly 20 is used to control the opening and closing of the first valve port 12; wherein, the inner diameter of the second valve port 22 is smaller than the inner diameter of the first valve port 12; the silencer circulation component 40 is fixedly arranged at one end of the second valve port 22 close to the first valve port 12, and the silencer circulation component 40 has a plurality of through holes 41, and the plurality of through holes 41 are respectively connected to the first valve port 12 and the second valve port 22 to divert and reduce noise of the fluid flowing between the first valve port 12 and the second valve port 22.

[0028] The present application provides multiple through-holes 41 on the muffler flow member 40 to ensure that the fluid can be effectively diverted by the multiple through-holes 41 when passing through the muffler flow member 40, thereby reducing the noise of the fluid during flow, reducing the noise of the electronic expansion valve switching, and improving user comfort. By fixing the muffler flow member 40 at the end of the second valve port 22 near the first valve port 12, the muffler flow member 40 is located at a position where the electronic expansion valve is prone to generating abnormal noise, thereby ensuring the diversion and noise reduction effect. The electronic expansion valve proposed in this application is an internal balancing valve, that is, it ensures that the pressure inside the second valve needle assembly 30 is balanced with the pressure in the first flow hole 13 and the first valve port 12, thereby enabling the electronic expansion valve to perform a certain expansion valve function when the first valve port 12 is closed. The electronic expansion valve proposed in this application can be used in refrigeration equipment. When the refrigerant in the refrigeration equipment flows through the muffler flow member 40 of the electronic expansion valve, it will be diverted, so that the volume of bubbles contained in the refrigerant is greatly reduced, significantly reducing the sound of bubble bursting in the refrigerant, thereby reducing the operating noise of the entire refrigeration equipment and improving user comfort.

[0029] In a specific embodiment of the present application, the second valve port 22 is communicated with the second flow hole 14 when it is opened, and the first valve port 12 is communicated with the second flow hole 14 when it is opened.

[0030] As shown in Figure 1, the valve seat assembly 10 has a second flow hole 14 communicating with the valve seat cavity 11. The valve seat assembly 10 also has a first flow hole 13 communicating with the valve seat cavity 11. The first valve port 12 is located within the valve seat cavity 11 and between the second flow hole 14 and the first flow hole 13. The first valve needle assembly 20 has a first valve needle cavity 21 extending axially therethrough. The second valve port 22 communicates with the end of the first valve needle cavity 21 near the first flow hole 13, and the first valve needle cavity 21 communicates with the second flow hole 14. The second valve needle assembly 30 opens and closes the second valve port 22, while the first valve needle assembly 20 opens and closes the first valve port 12. A silencer 40 is disposed at the end of the first valve needle cavity 21 near the first flow hole 13. This arrangement ensures the reliability of the electronic expansion valve while simplifying its internal structure.

[0031] It should be noted that when the fluid passes through the first valve port 12 and the second valve port 22 in sequence and enters the first valve needle chamber 21, the smaller diameter of the second valve port 22 throttles the fluid. This throttling is accompanied by a large number of bubbles bursting, which in turn causes the fluid to generate noise. Therefore, it is necessary to pre-treat the fluid through the silencer flow element 40 before the fluid enters the second valve port 22. This can reduce the number of bubbles bursting when the fluid enters the second valve port 22, thereby reducing noise. The silencer flow element 40 in this application is fixedly disposed at one end of the first valve needle chamber 21 near the first flow hole 13, and has multiple through holes 41 that communicate with the first flow hole 13 and the second valve port 22, respectively.

[0032] As shown in Figure 1, the second valve needle assembly 30 has a second valve needle chamber 31 therein. The second valve needle chamber 31 communicates with the first flow hole 13 and the balance chamber of the second valve needle assembly 30 (the balance chamber balances the pressure in the axial direction of the second valve needle assembly 30, facilitating axial movement of the second valve needle assembly 30; it includes a first back-pressure chamber 111 and a second back-pressure chamber 211). The second flow hole 14 is provided on the side of the valve seat assembly 10 and extends through the valve seat chamber 11. The electronic expansion valve also includes a first sealing member 50. The first valve port 12 is located on the first sealing member 50 and within the valve seat chamber 11. The first valve needle assembly 20 seals the first valve port 12 by sealing with the first sealing member 50. The provision of the first sealing member 50 ensures that the first valve needle assembly 20 can reliably open and close the first valve port 12. By setting the second valve needle chamber 31 to be connected to 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.

[0033] It should be noted that: in a specific embodiment of the present application, 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. They can be flexibly provided according to actual use requirements, and the overall structure of the electronic expansion valve can be simplified as much as possible while ensuring working reliability.

[0034] As shown in Figures 2, 3, 4, and 5, the silencer flow member 40 is a circular gasket structure with multiple through-holes 41 spaced apart throughout the silencer flow member 40. The central axes of the through-holes 41 are parallel to or collinear with the central axis of the silencer flow member 40. This arrangement ensures the operational reliability of the silencer flow member 40, facilitates integral molding and subsequent processing, and also facilitates installation of the silencer flow member 40 within the first valve needle chamber 21.

[0035] Optionally, in a specific embodiment of the present application, the silencer circulation member 40 is made of metal material to facilitate processing and reduce costs.

[0036] The specific working process of the electronic expansion valve proposed in the present application 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 second valve port 22, and the second valve port 22 and the second flow hole 14 are not connected, and the first valve needle assembly 20 blocks the first valve port 12, and the first 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 first valve port 12, and the second valve needle assembly 30 adjusts the opening of the second valve port 22 by axial movement, and the first valve port 12 is connected to the second flow hole 14 through the second valve port 22; in the fully open state, the first valve needle assembly 20 opens the first valve port 12, and the first valve port 12 and the second flow hole 14 are directly connected, thereby realizing reliable regulation of large flow of fluid.

[0037] As shown in Figures 4 and 5 , the multiple through-holes 41 include a central hole 411 and multiple surrounding holes 412. The central axis of the central hole 411 is collinear with the central axis of the muffler flow element 40. The multiple surrounding holes 412 surround the central hole 411 and are evenly distributed along the circumference of the central hole 411. This arrangement structurally ensures a uniform distribution of the multiple through-holes 41, increasing the flow area of ​​the fluid at the muffler flow element 40 while ensuring a reasonable distribution of the multiple through-holes 41. In actual use, the sizes of the central hole 411 and surrounding holes 412 can be flexibly adjusted according to actual needs to improve applicability.

[0038] As shown in Figures 2, 4, and 5, 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 second valve port 22; alternatively, 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 second valve port 22. By setting the inner diameters of the middle hole 411 and the surrounding hole 412 smaller than the inner diameter of the second valve port 22, the middle hole 411 and the surrounding hole 412 are guaranteed to have a flow diversion and noise reduction effect on the fluid.

[0039] In actual use, it was 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. 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 impact on the normal and smooth flow of the fluid, but the diversion effect on the fluid is also weak; 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 impact on the normal and smooth flow of the fluid, but has a stronger diversion effect on the fluid; 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.

[0040] As shown in Figures 4 and 5 , the silencer flow member 40 has a slot 42 on at least one axial end surface, and a through hole 41 extends through both axial ends of the silencer flow member 40. The slot 42 has a radial dimension greater than that of the second valve port 22, but smaller than that of the first valve port 12. The slot 42 facilitates the subsequent precise positioning of the intermediate hole 411 and surrounding hole 412, while also ensuring reliable axial fixation of the silencer flow member 40 to the second sealing member 24.

[0041] In a specific embodiment of the present application, the through hole 41 penetrates the bottom wall of the slot 42 in the axial direction; the axial projection size of the slot 42 is larger than the axial projection size of the second valve port 22 and smaller than the axial projection size of the first valve port 12.

[0042] As shown in Figures 4 and 5 , the silencer flow-through member 40 has a slot 42 at each axial end, with the projections of the two slots 42 on the valve radial cross-section overlapping. A through hole 41 extends through both axial ends of the silencer flow-through member 40. By providing two slots 42 and having the projections of the two slots 42 on the valve radial cross-section overlap, the silencer flow-through member 40 does not need to be distinguished between the front and back sides or the installation orientation of each end during installation, facilitating quick installation by the operator.

[0043] It should be noted that: the overlap of the projections of the two slots 42 on the radial cross-section of the valve refers to the overlap of the axial projections of the two slots 42 at both ends; in a specific embodiment of the present application, one end of the through hole 41 penetrates the bottom wall of the slot 42 at one axial end of the silencer circulation component 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 component 40.

[0044] As shown in Figures 1 and 2, 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 disposed within the valve seat cavity 11. The first valve needle cavity 21 is located within the main valve needle body 23, and the second valve port 22 is located on the second sealing member 24 and extends through the second sealing member 24. The second sealing member 24 is disposed at one end of the first valve needle cavity 21 near the first flow hole 13 and is circumferentially engaged with the inner wall of the first valve needle cavity 21. The silencer flow member 40 is circumferentially fixedly connected to the inner wall of the first valve needle cavity 21. One axial end of the second sealing member 24 abuts the inner wall of the first valve needle cavity 21, and the other end abuts one axial end of the silencer flow member 40 to axially secure the second sealing member 24. This arrangement ensures the operational reliability of the silencer flow member 40 while reliably securing the second sealing member 24.

[0045] In a specific embodiment of the present application, 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.

[0046] As shown in Figures 1 and 2, the abutting end of the silencer flow member 40 and the second seal 24 has a slot 42. A through hole 41 extends through the bottom wall of the slot 42 in the axial direction. The slot 42's radial dimension (i.e., circumferential dimension) is larger than the inner diameter of the second valve port 22 and smaller than the outer diameter of the second seal 24. The slot 42 has rounded corners to reduce flow resistance. By setting the circumferential dimension of the slot 42 smaller than the outer circumference of the second seal 24, the end face of the silencer flow member 40 is ensured to abut tightly against the second seal 24, thereby achieving reliable fixation of the second seal 24. The rounded corners of the slot 42 effectively reduce turbulence, thereby ensuring smooth flow of the fluid.

[0047] As shown in Figures 1 and 2, 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 movably 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 axial direction of the third sealing member 60, and the first back pressure cavity 111 is connected to the first valve port 12; by setting the first back pressure cavity 111 to be connected to the first valve port 12, the two axial ends of the second valve needle assembly 30 can achieve pressure balance, thereby facilitating the axial movement of the second valve needle assembly 30 and controlling the opening and closing of the second valve port 22.

[0048] As shown in Figures 1 and 2, a fourth sealing member 70 is provided between the second valve needle assembly 30 and the first valve needle assembly 20. The second valve needle assembly 30 is in sealed engagement with the first valve needle assembly 20 via the fourth sealing member 70. The first valve needle assembly 20 includes a flow port 25, and an axially extending first valve needle chamber 21 therein. The flow port 25 communicates with the second flow hole 14 and the first valve needle chamber 21, respectively. The first valve needle chamber 21 includes a second back pressure chamber 211, which is located axially opposite the flow port 25 and is in communication with the second valve port 22. The second valve needle assembly 30 includes a second valve needle chamber 31 therein, which is in communication with the second valve needle chamber 31. This arrangement enables the electronic expansion valve to function as an internally balanced valve, thereby effectively ensuring smooth movement of the first and second valve needle assemblies 20 and 30.

[0049] In summary, the present application provides an electronic expansion valve, which ensures that the fluid can be effectively diverted by the multiple through holes 41 when passing through the silencer circulation member 40 by setting a plurality of through holes 41 on the silencer circulation member 40, thereby reducing the noise of the fluid during flow, reducing the noise of the electronic expansion valve switching valve, and improving the user's comfort; by fixing the silencer circulation member 40 at one end of the second valve port 22 close to the first 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 and noise reduction effect; the electronic expansion valve proposed in the present application The sub-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 first valve port 12, so that the electronic expansion valve can achieve a certain expansion valve function when the first valve port 12 is closed; the electronic expansion valve proposed in the present application can be used on refrigeration equipment, and the refrigerant in the refrigeration equipment will be diverted when flowing through the silencer flow part 40 of the electronic expansion valve, so that the volume of the bubbles contained in the refrigerant is greatly reduced, and the sound of the bubbles bursting in the refrigerant is significantly reduced, thereby reducing the working noise of the entire refrigeration equipment and improving the user comfort.

[0050] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An electronic expansion valve, characterized in that, It includes a valve seat assembly (10), a first valve needle assembly (20), a second valve needle assembly (30) and a silencing flow component (40). The valve seat assembly (10) has a valve seat cavity (11) inside; at least part of the first valve needle assembly (20) and at least part of the second valve needle assembly (30) are located in the valve seat cavity (11); the valve seat assembly (10) also has a first valve port (12); the first valve needle assembly (20) has a second valve port (22) communicating with the first valve port (12); the second valve needle assembly (30) is used to control the opening and closing of the second valve port (22); the first valve needle assembly (20) is used to control the opening and closing of the first valve port (12). Wherein, the inner diameter of the second valve port (22) is smaller than that of the first valve port (12); the silencing flow component (40) is fixedly arranged at one end of the second valve port (22) close to the first valve port (12), and the silencing flow component (40) has a plurality of through holes (41), and the plurality of through holes (41) are respectively communicated with the first valve port (12) and the second valve port (22).

2. The electronic expansion valve according to claim 1, wherein The valve seat assembly (10) has a second flow hole (14) communicating with the valve seat cavity (11); the valve seat assembly (10) also has a first flow hole (13) communicating with the valve seat cavity (11), and the first valve port (12) is located in the valve seat cavity (11) and between the second flow hole (14) and the first flow hole (13); the first valve needle assembly (20) has a first valve needle cavity (21) axially penetrating inside, the second valve port (22) is communicated with one end of the first valve needle cavity (21) close to the first flow hole (13), and the first valve needle cavity (21) is communicated with the second flow hole (14); the silencing flow component (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 seal (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 in sealed movable cooperation with the valve seat assembly (10) through the third seal (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 on both sides of the third seal (60) in the axial direction, and the first back pressure cavity (111) is communicated with the first valve port (12).

4. The electronic expansion valve according to claim 3, characterized in that, A fourth seal (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 in sealed and movable cooperation with the first valve needle assembly (20) through the fourth seal (70); a flow port (25) is provided in the first valve needle assembly (20), and the flow port (25) is respectively communicated with the second flow hole (14) and the first valve needle cavity (21); the first valve needle cavity (21) includes a second back pressure cavity (211), the second back pressure cavity (211) and the flow port (25) are respectively located on two sides of the fourth seal (70) in the axial direction, and the second back pressure cavity (211) is communicated with the second valve port (22).

5. The electronic expansion valve according to claim 4, characterized in that, A second valve needle cavity (31) is provided inside the second valve needle assembly (30), and the second back pressure cavity (211) is communicated with the second valve needle cavity (31); the first back pressure cavity (111) is communicated with the second back pressure cavity (211), and the second valve needle cavity (31) is communicated with both the second valve port (22) and the first valve port (12).

6. The electronic expansion valve according to any one of claims 1 to 5, characterized in that, A plurality of the through holes (41) are spaced apart from each other on the sound-absorbing flow member (40), and the central axes of the plurality of through holes (41) are respectively parallel or collinear with the central axis of the sound-absorbing flow member (40); the plurality of through holes (41) include an intermediate hole (411) and a plurality of surrounding holes (412), and the central axis of the intermediate hole (411) is collinear with the central axis of the sound-absorbing flow member (40); the plurality of surrounding holes (412) surround the intermediate hole (411) and are evenly distributed along the circumferential direction of the intermediate hole (411).

7. The electronic expansion valve according to claim 6, wherein, The inner diameter of the intermediate hole (411) is larger than the inner diameter of the surrounding holes (412), and the inner diameter of the intermediate hole (411) is smaller than the inner diameter of the second valve port (22); alternatively, the inner diameter of the intermediate hole (411) is smaller than the inner diameter of the surrounding holes (412), and the inner diameter of the surrounding holes (412) is smaller than the inner diameter of the second valve port (22).

8. The electronic expansion valve according to claim 1, wherein, The sound-absorbing flow member (40) has a slot (42) at least on one end face in the axial direction, and the through hole (41) penetrates through both ends of the sound-absorbing flow member (40) in the axial direction; wherein, the dimension of the slot (42) in the valve radial direction is larger than the dimension of the second valve port (22) in the valve radial direction and smaller than the dimension of the first valve port (12) in the valve radial direction.

9. The electronic expansion valve according to claim 8, wherein Both ends of the sound-absorbing flow member (40) in the axial direction respectively have a slot (42), and the projections of the two slots (42) at both ends in the valve radial cross-section coincide; the through hole (41) penetrates through both ends of the sound-absorbing flow member (40) in the axial direction.

10. The electronic expansion valve according to claim 2, wherein The first valve needle assembly (20) includes a main valve needle body (23) and a second seal (24). The main valve needle body (23) is movably arranged in the valve seat cavity (11). The first valve needle cavity (21) is located within the main valve needle body (23). The second valve port (22) is located at the second seal (24). One end of the second seal (24) abuts against the inner wall of the first valve needle cavity (21), and the other end abuts against the silencing flow component (40).

11. The electronic expansion valve according to claim 10, characterized in that, The abutting end of the silencing flow component (40) and the second seal (24) has a slot (42). The through hole (41) penetrates the bottom wall of the slot (42) in the axial direction. The dimension of the slot (42) in the valve radial direction is larger than the inner diameter of the second valve port (22) and smaller than the outer diameter of the second seal (24).

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