Electronic expansion valve

Abstract

The present application provides an electronic expansion valve. The electronic expansion valve comprises: a housing; a valve seat, which is internally provided with a cavity, the valve seat being provided with a valve port and a communication port, the valve port being formed at the end of the cavity away from the housing, the communication port being formed on a side wall of the cavity, and the communication port being used for being connected to a refrigerant pipeline; a valve needle is movably arranged within the housing, and the valve needle is used for regulating flow at the valve port; a nut, where a first section is provided on a side wall thereof, a communication channel being formed between the first section and a side wall of the valve seat cavity, the cavity being in communication with the inside of the housing by means of the communication channel, and the valve needle being arranged as passing into the nut; wherein in a radial cross section of the cavity, the included angle between the axis of the communication port and the first section is alpha, 45° ≤ α ≤ 90°. According to the technical solution provided in the invention, the problem in the prior art of noise produced when an electronic expansion valve is used can be solved.

Description

Electronic expansion valve

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on September 29, 2023, with application number 2023226640653 and title “Electronic Expansion Valve.” Technical Field

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

[0003] The electronic expansion valve in the prior art mainly includes a valve needle, a valve seat, a nut sleeve and a rotor assembly. The valve seat has a valve cavity and a valve port. The valve needle assembly can cooperate with the nut sleeve under the drive of the rotor assembly to approach or move away from the valve port, thereby adjusting the flow rate of the fluid at the valve port. When the fluid enters the valve cavity from the connecting port, it will impact the lower end of the nut sleeve and the inner wall of the valve cavity, thereby generating bubbles. The bubbles will then flow downward to the valve port and burst, generating noise, affecting the user experience.

[0004] Summary of the Invention

[0005] The present application provides an electronic expansion valve to solve the problem in the prior art that the electronic expansion valve generates noise during use.

[0006] The present application provides an electronic expansion valve, comprising: a shell; a valve seat, which is provided with a chamber therein, the valve seat being provided with a valve port and a connecting port, the valve port being provided at an end of the chamber away from the shell, the connecting port being provided on the side wall of the chamber, the connecting port being used to connect to a refrigerant pipeline; a valve needle, movably provided in the shell, the valve needle being used to adjust the flow of the valve port; a nut sleeve, which is provided with a first section on its side wall, a flow channel being formed between the first section and the side wall of the valve seat chamber, the chamber being connected with the interior of the shell through the flow channel, and the valve needle being inserted into the nut sleeve; wherein, on a radial cross-section of the chamber, the angle between the axis of the connecting port and the first section is α, 45°≤α≤90°.

[0007] Applying the technical solution of the present application, the electronic expansion valve includes a shell, a valve seat, a rotor assembly, a valve needle and a nut sleeve. By setting a first section on the side wall of the first section of the nut sleeve, a circulation channel is formed between the first section and the side wall of the chamber, so that the chamber is connected to the interior of the shell through the circulation channel. Particularly, on the radial cross-section of the chamber, the angle between the axis of the connecting port and the first section is α, 45°≤α≤90°. Through the above-mentioned setting, the circulation channel is always kept in a flowing state. While ensuring that the pressure inside the chamber and the shell is consistent, it can drain the bubbles generated when the fluid enters the chamber from the connecting port, so that the bubbles can flow smoothly into the circulation channel, thereby reducing the number of bubbles that flow directly vertically downward to the valve port, and further reducing the noise generated by the bubbles bursting at the valve port, ensuring the noise reduction effect, and improving the user's comfort.

[0008] Furthermore, the chamber is a mounting cavity and a valve cavity that are communicated with each other, the valve port is arranged at one end of the valve cavity away from the shell, and the communication port is arranged on the side wall of the valve cavity.

[0009] Furthermore, the nut sleeve has a first section and a second section connected in sequence along the axial direction, the first section is arranged in the installation cavity, and the second section is partially located in the valve cavity. A first section is provided on the side wall of the first section, and a flow channel is formed between the first section and the side wall of the installation cavity. The valve cavity is connected to the interior of the shell through the flow channel, and the valve needle is inserted into the nut sleeve.

[0010] Furthermore, the second section tapers gradually from the end closest to the valve port toward the mounting cavity. This configuration allows the second section to guide bubbles in the fluid, reducing the impact of the fluid on the nut sleeve and the sidewalls of the valve cavity, allowing bubbles to flow more smoothly into the flow channel, thereby reducing noise generated by bubbles at the valve port.

[0011] Furthermore, the electronic expansion valve also includes a rotor assembly rotatably disposed within the housing. The rotor assembly includes a magnetic rotor and a rotor connecting plate. The magnetic rotor is sleeved onto the exterior of the rotor connecting plate. The end of the valve needle, distal from the valve port, is inserted through the rotor connecting plate. The magnetic rotor is drivingly connected to the valve needle via the rotor connecting plate, enabling the rotor assembly to drive the valve needle to rotate within the housing. A limiting structure is provided between the rotor connecting plate and the valve needle, restricting rotation of the valve needle relative to the rotor connecting plate. This limiting structure ensures that the valve needle's rotation angle is the same as the rotor connecting plate's, thereby improving the accuracy of the electronic expansion valve's operation.

[0012] Furthermore, the rotor connecting plate is provided with a first mounting hole and a mounting slot. The mounting slot is located on the end surface of the rotor connecting plate and communicates with the first mounting hole. The valve needle is inserted into the first mounting hole. The rotor assembly also includes a stopper, which is disposed within the mounting slot and sleeved over the valve needle. The stopper is fixedly connected to the valve needle and the rotor connecting plate, respectively. With this arrangement, the rotor connecting plate can rotate the stopper, thereby driving the valve needle to rotate, thereby enabling the valve needle to regulate the flow at the valve port, thereby improving the accuracy of the electronic expansion valve operation.

[0013] Furthermore, the sidewall of the limiting plate has a second cross-section, and the inner wall of the mounting groove matches the outer circumference of the limiting plate to restrict the valve needle from rotating relative to the rotor connecting plate. The mounting groove and the limiting plate cooperate to form a limiting structure. By providing the second cross-section on the limiting plate and matching the inner wall of the mounting groove with the outer circumference of the limiting plate, the limiting plate and the rotor connecting plate are circumferentially limited, thereby improving the accuracy of the electronic expansion valve's operation.

[0014] Furthermore, the valve needle has a connecting end, which is disposed away from the valve port. A third cross-section is provided on a sidewall of the connecting end. The limiting plate has a second mounting hole. The connecting end of the valve needle sequentially passes through the first mounting hole and the second mounting hole. The inner wall shape of at least one of the first mounting hole and the second mounting hole matches the outer circumferential shape of the connecting end to limit the rotation of the valve needle relative to the rotor connecting plate. The connecting end cooperates with the first mounting hole and / or the second mounting hole to form a limiting structure. Through the above design, at least one of the limiting plate and the rotor connecting plate can be compatible with the connecting end of the valve needle, ensuring circumferential limitation of the valve needle and thereby ensuring synchronous rotation of the valve needle and the rotor connecting plate.

[0015] Furthermore, the stopper and the rotor connecting plate are integrally formed. Through the above arrangement, the connection performance between the stopper and the rotor connecting plate is improved, the fixing effect on the valve needle is more stable, and the stopper is prevented from loosening when the valve needle rotates.

[0016] Furthermore, the rotor assembly includes a compression sleeve, which is mounted on the valve needle and forms an interference fit with the valve needle. The compression sleeve is located on the side of the rotor connecting plate away from the valve port and can limit the axial position of the valve needle relative to the rotor connecting plate. By providing the compression sleeve to press the valve needle against the rotor connecting plate, the radial and axial displacements of the valve needle are further limited.

[0017] Furthermore, the bottom of the mounting groove has an avoidance groove, which is annularly arranged at the periphery of the mounting groove, and the limiting piece contacts the bottom of the mounting groove, thereby improving the fit between the end face of the limiting piece and the bottom surface of the mounting groove, thereby ensuring the matching accuracy of the limiting piece and the mounting groove.

[0018] Furthermore, the valve needle has an externally threaded section, and the nut sleeve has an internally threaded section. The externally threaded section and the internally threaded section are threadedly engaged. The rotor assembly drives the valve needle to rotate, causing the valve needle to move axially to adjust the flow at the valve port. The engagement of the valve needle's external thread and the nut sleeve's internal thread enables the valve needle to rotate and move up and down relative to the nut sleeve, thereby moving the valve needle axially toward or away from the valve port to adjust the flow at the valve port and enhance the electronic expansion valve's control of the fluid.

[0019] Furthermore, a sealing end is formed at one end of the valve needle facing the valve port. The sealing end has a first tapered section, the diameter of which gradually decreases as the sealing end moves away from the rotor assembly. The valve port has a first port and a second port disposed opposite each other. The first port is disposed toward the valve needle, and a chamfered structure is provided on the periphery of the first port. The periphery of the first port has dimensions that match those of the first tapered section. Through this arrangement, the diameter of the first tapered section gradually decreases from the sealing end toward the valve port, thereby guiding the fluid and mitigating the impact of the fluid on the valve needle and valve port. The chamfered structure on the first port matches the dimensions of the first tapered section to form a channel, further guiding the fluid and allowing it to flow more smoothly through the valve port.

[0020] Furthermore, the sealing end includes a straight section and a second tapered section. The first tapered section, the straight section, and the second tapered section are sequentially connected. The diameter of the second tapered section gradually decreases as it moves away from the first tapered section. When the valve needle moves toward the valve port to the lower limit position, a flow gap is formed between the valve needle and the inner wall of the valve port. This arrangement ensures that flow can still flow when the valve needle is fully closed.

[0021] Furthermore, when the valve needle moves toward the valve port to its lower limit position, the distance between the edge of the chamfered structure near the second port and the end of the straight segment away from the external thread segment is L1, and the thread gap between the internal and external thread segments is L2, where L1>L2. With this arrangement, when the valve needle moves to its lower limit position within the nut sleeve, a gap remains between the first port of the valve port and the straight segment of the valve needle. This allows fluid to continue to flow through the valve port when the electronic expansion valve is closed, ensuring that the flow rate of fluid flowing in or out of the valve port remains consistent when the device is fully closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] FIG1 shows a schematic structural diagram of an electronic expansion valve in a first embodiment provided by the present application;

[0024] FIG2 shows a top view of the assembly of the valve seat and the nut sleeve provided by the present application;

[0025] FIG3 shows a schematic diagram of the assembly of the rotor assembly and the valve needle provided in this application;

[0026] FIG4 shows a schematic structural diagram of a rotor assembly provided by the present application;

[0027] FIG5 shows a schematic structural diagram of a valve needle provided in this application;

[0028] FIG6 shows a schematic structural diagram of the limiting piece provided in this application;

[0029] FIG7 shows a top view of the assembly of the valve needle, the limiting plate and the rotor assembly provided by the present application;

[0030] FIG8 shows a schematic diagram of the assembly of the rotor assembly and the valve needle in the second embodiment provided by the present application;

[0031] FIG9 shows a top view of the assembly of the valve needle, the limiting plate and the rotor assembly in the second embodiment provided by the present application;

[0032] FIG10 is a schematic structural diagram of a valve needle with a cross section in the second embodiment provided by the present application;

[0033] FIG11 shows a schematic diagram of the assembly of the rotor assembly and the valve needle in the third embodiment provided by the present application;

[0034] FIG12 shows a schematic diagram of the assembly of the rotor assembly and the valve needle in the fourth embodiment provided by the present application;

[0035] FIG13 shows a partial enlarged view of point A in FIG1 ;

[0036] FIG. 14 shows a partial enlarged view of point B in FIG. 1 .

[0037] The above drawings include the following reference numerals:

[0038] 10. Housing;

[0039] 20. Valve seat; 21. Valve port; 211. First port; 212. Second port; 22. Communication port;

[0040] 30. Valve needle; 31. Connecting end; 32. External thread section; 33. Sealing end; 331. First tapered section; 332. Straight section; 333. Second tapered section; 34. Third section;

[0041] 40. Nut sleeve; 41. First section; 42. Second section; 43. Internal thread section;

[0042] 50. Rotor assembly; 51. Magnetic rotor; 52. Rotor connecting plate; 521. First mounting hole; 522. Mounting slot; 5221. Avoidance groove; 53. Positioning plate; 531. Second section; 532. Second mounting hole; 54. Press sleeve;

[0043] 100. Refrigerant pipeline; 200. First section; 300. Circulation channel. DETAILED DESCRIPTION

[0044] 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.

[0045] As shown in Figures 1, 2, and 13, an embodiment of the present application provides an electronic expansion valve, which includes a housing 10, a valve seat 20, a valve needle 30, and a nut sleeve 40. The housing 10 has an installation space, and the valve seat 20 has a chamber therein. The valve seat 20 is also provided with a valve port 21 and a communication port 22. The valve port 21 is provided at an end of the chamber away from the housing 10, and the communication port 22 is provided on the side wall of the chamber. The communication port 22 is used to connect to the refrigerant pipeline 100. The valve needle 30 is movably provided in the housing 10 and is used to adjust the flow at the valve port 21. The nut sleeve 40 has a first section 41 and a second section 42 connected in series along the axial direction. The first section 41 is partially disposed within the chamber, while the second section 42 is also located within the chamber. A first section 200 is provided on the sidewall of the first section 41. A flow channel 300 is formed between the first section 200 and the sidewall of the chamber. The chamber communicates with the interior of the housing 10 through the flow channel 300, and the valve needle 30 is disposed within the nut sleeve 40. In a radial cross-section of the chamber, the angle α between the axis of the communication port 22 and the first section 200 is 45°≤α≤90°.

[0046] Applying the technical solution of the present application, the electronic expansion valve includes a shell 10, a valve seat 20, a valve needle 30 and a nut sleeve 40, wherein the shell 10 has an installation space, a chamber is provided in the valve seat 20 to facilitate the installation of the nut sleeve 40, the valve needle 30 is used to adjust the flow at the valve port 21, and the nut sleeve 40 has a first section 41 and a second section 42 connected in sequence along the axial direction. By providing a first section 200 on the side wall of the first section 41 of the nut sleeve 40, a flow channel 300 is formed between the first section 200 and the side wall of the chamber, so that the chamber is connected to the interior of the shell 10 through the flow channel 300, wherein the radial section of the chamber is On the surface, the angle between the axis of the connecting port 22 and the first section 200 is α, 45°≤α≤90°. Through the above arrangement, the circulation channel 300 is always kept in a circulation state. While ensuring that the internal pressure of the chamber and the shell 10 is always consistent, the bubbles generated by the impact of the lower end of the nut sleeve 40 and the side wall of the chamber when the fluid enters the chamber from the connecting port 22 can be drained, so that the bubbles can flow smoothly into the circulation channel 300, reducing the number of bubbles flowing directly vertically downward to the valve port 21, and further reducing the noise generated by the bursting of bubbles at the valve port 21, thereby ensuring the noise reduction effect and improving the user's comfort.

[0047] Among them, when the angle α is less than 45° or greater than 90°, the refrigerant fluid cannot well guide the bubbles to flow directly into the circulation channel 300 when flowing out of the connecting port 22. It needs to bypass the side wall of the nut sleeve 40 and enter the circulation channel 300 from the first section 200, and the circulation rate of the fluid is reduced. Therefore, in the present application, the angle α between the axis of the connecting port 22 and the first section 200 is set to be between 45° and 90°, which is convenient for direct drainage of bubbles and ensures the circulation rate of the fluid. In this embodiment, the angle α is set to 45°, 70° or 90°, preferably to 90°. At this time, the circulation channel 300 is set opposite the connecting hole, which can better guide the bubbles into the circulation channel 300.

[0048] Specifically, the chamber has an installation cavity and a valve cavity that are connected to each other, and the installation cavity and the valve cavity are arranged in a stepped manner. The valve port 21 is arranged at one end of the valve cavity away from the housing 10, and the communication port 22 is arranged on the side wall of the valve cavity.

[0049] In this embodiment, the nut sleeve 40 has a first section 41 and a second section 42 connected in sequence along the axial direction. The first section 41 is arranged in the installation cavity, and the second section 42 is partially located in the valve cavity. A first section 200 is provided on the side wall of the first section 41. A flow channel 300 is formed between the first section 200 and the side wall of the installation cavity. The valve cavity is connected to the interior of the shell 10 through the flow channel 300, and the valve needle 30 is inserted into the nut sleeve 40.

[0050] In a specific embodiment of the present application, two first cut surfaces 200 are provided on the sidewall of the first section 41 of the nut sleeve 40, and are arranged parallel and symmetrically along the center of the nut sleeve 40. Accordingly, two circulation channels 300 are also provided corresponding to the first cut surfaces 200, and the diameter of the mounting cavity is set to D2. The radial distance between the two cut surfaces of the nut sleeve 40 is set to D1, where D1 is less than D2. This arrangement ensures that the circulation channel 300 is always present and can ensure that the force exerted on the nut sleeve 40 when the fluid passes through the circulation channel 300 is relatively balanced, reducing the disturbance of the fluid on the nut sleeve 40 and further improving the noise reduction effect of the electronic expansion valve.

[0051] Specifically, the second section 42 tapers gradually from one end near the valve port 21 toward the mounting cavity. With this arrangement, when refrigerant fluid flows into the valve cavity, the second section 42 can guide bubbles in the fluid, reducing the impact of the fluid on the nut sleeve 40 and the sidewalls of the valve cavity. This allows bubbles to flow more smoothly into the circulation channel 300, reducing the number of bubbles that flow directly into the valve port 21. This, in turn, reduces the noise generated by the bubbles at the valve port, further reducing the noise generated by the device.

[0052] The electronic expansion valve further includes a rotor assembly 50, which is rotatably disposed within the housing 10. The rotor assembly 50 includes a magnetic rotor 51 and a rotor connecting plate 52. The magnetic rotor 51 is sleeved onto the exterior of the rotor connecting plate 52. The end of the valve needle 30, distal from the valve port 21, is inserted through the rotor connecting plate 52. The magnetic rotor 51 is drivingly connected to the valve needle 30 via the rotor connecting plate 52, enabling the rotor assembly 50 to drive the valve needle 30 to rotate within the housing 10. A retaining structure is provided between the rotor connecting plate 52 and the valve needle 30. The retaining structure restricts the relative rotation of the valve needle 30 relative to the rotor connecting plate 52, ensuring synchronous rotation of the valve needle 30 and the rotor connecting plate 52. This arrangement allows the magnetic rotor to rotate the valve needle 30 via the rotor connecting plate 52, limiting the relative rotation between the valve needle 30 and the rotor connecting plate 52. This ensures that the rotation angle of the valve needle 30 is the same as that of the rotor connecting plate 52, thereby improving the accuracy of the electronic expansion valve's operation.

[0053] As shown in Figures 3 to 7, the rotor connecting plate 52 is provided with a first mounting hole 521 and a mounting groove 522. The mounting groove 522 is located on the end surface of the rotor connecting plate 52 and communicates with the first mounting hole 521. The valve needle 30 is inserted into the first mounting hole 521. The rotor assembly 50 also includes a limiting plate 53. The limiting plate 53 is disposed in the mounting groove 522 and sleeved on the valve needle 30. The limiting plate 53 is fixedly connected to the valve needle 30 and the rotor connecting plate 52, respectively. In this arrangement, when the rotor connecting plate 52 rotates, the rotor connecting plate 52 can drive the limiting plate 53 to rotate, thereby driving the valve needle 30 to rotate, thereby achieving the function of the valve needle 30 regulating the flow at the valve port 21. The cooperation between the limiting plate 53 and the mounting groove 522 further limits the relative movement of the valve needle 30 and the rotor connecting plate 52, thereby improving the stability of the connection between the valve needle 30 and the rotor connecting plate 52 and enhancing the accuracy of the operation of the electronic expansion valve.

[0054] Furthermore, the sidewall of the limiting plate 53 has a second cut surface 531. The inner wall of the mounting groove 522 matches the outer circumference of the limiting plate 53 to restrict the rotation of the valve needle 30 relative to the rotor connecting plate 52. The limiting plate 53 and the mounting groove 522 cooperate to form a limiting structure. By providing the second cut surface 531 on the limiting plate 53 and matching the inner wall of the mounting groove 522 with the outer circumference of the limiting plate 53, the limiting plate 53 and the rotor connecting plate 52 are circumferentially limited, further improving the accuracy of the electronic expansion valve's operation. Furthermore, the structural design of the second cut surface 531 facilitates machining of the limiting plate 53.

[0055] As shown in Figures 8 to 10, in the second embodiment provided by the present application, the limiting structure between the valve needle 30 and the rotor connecting plate 52 is that the valve needle 30 engages with the first mounting hole 521 and / or the second mounting hole 532 via a limiting plate 53. Specifically, the valve needle 30 has a connecting end 31, which is located away from the valve port 21. The sidewall of the connecting end 31 is provided with a third cut surface 34. The limiting plate 53 has a second mounting hole 532. The connecting end 31 of the valve needle 30 sequentially passes through the first mounting hole 521 and the second mounting hole 532. The inner wall shape of at least one of the first mounting hole 521 and the second mounting hole 532 is adapted to the outer circumferential shape of the connecting end 31 to restrict the rotation of the valve needle 30 relative to the rotor connecting plate 52. This arrangement allows at least one of the limiting plate 53 and the rotor connecting plate 52 to be adapted to the connecting end 31 of the valve needle 30, ensuring circumferential positioning of the valve needle 30 and, thereby, ensuring synchronous rotation of the valve needle 30 and the rotor connecting plate 52. Specifically, the first mounting hole 521 may be adapted to the connection end 31, the second mounting hole 532 may be adapted to the connection end 31, or both the first mounting hole 521 and the second mounting hole 532 may be adapted to the connection end 31. This provides a dual position limit for the valve needle 30, further tightening the connection between the valve needle 30 and the rotor connecting plate 52, improving rotational synchronization, and further enhancing the accuracy of the electronic expansion valve operation. In this embodiment, both the first mounting hole 521 and the second mounting hole 532 are adapted to the outer circumference of the connection end 31.

[0056] Furthermore, the valve needle 30 is welded to the limiting plate 53. Through the above arrangement, welding can make the connection between the valve needle 30 and the limiting plate 53 tighter, without the need for other fasteners for connection, making operation convenient, and allowing the valve needle 30 to drive the limiting plate 53 to rotate simultaneously, thereby reducing the rotational error between the valve needle 30 and the limiting plate 53. In a specific embodiment of the present application, the valve needle 30 is made of metal, the limiting plate 53 is made of engineering plastic, and the valve needle 30 and the limiting plate 53 are connected by laser welding, which can reduce the heat-affected zone during welding, reduce the impact of heat on the valve needle 30, and ensure the connection accuracy between the valve needle 30 and the limiting plate 53.

[0057] Of course, the limiting plate 53 and the rotor connecting plate 52 can also be set as an integrally formed structure. Through the above-mentioned setting, the connection performance of the limiting plate 53 and the rotor connecting plate 52 is improved, the circumferential rotation of the valve needle 30 relative to the rotor connecting plate 52 is better limited, the fixing effect of the valve needle 30 is more stable, and the limiting plate 53 is prevented from loosening when the valve needle 30 rotates. In a specific embodiment of the present application, the limiting plate 53 and the rotor connecting plate 52 are both made of engineering plastics. Engineering plastics have good heat resistance, cold resistance, machinability and structural stability. The limiting plate 53 and the rotor connecting plate 52 are an injection-molded integrally formed structure, which facilitates the production and processing of the rotor connecting plate 52 and the limiting plate 53. The limiting plate 53 and the rotor connecting plate 52 processed by the injection molding process have high matching accuracy and relatively low manufacturing cost, while improving the overall structural strength of the rotor assembly 50.

[0058] As shown in FIG11 , the third embodiment provided herein differs from the second embodiment in that the rotor assembly 50 further includes a press sleeve 54, which is sleeved over the valve needle 30 and forms an interference fit with the valve needle 30. The press sleeve 54 is located on the side of the rotor connecting plate 52 away from the valve port 21 and is capable of limiting the axial downward position of the valve needle 30 relative to the rotor connecting plate 52. The interference fit between the press sleeve 54 and the valve needle 30 further limits the circumferential displacement of the valve needle 30 relative to the rotor connecting plate 52. Specifically, in this embodiment, a limit plate 53 is provided below the press sleeve 54. The press sleeve 54 presses the limit plate 53 against the rotor connecting plate 52, and the press sleeve 54 cooperates with the limit plate 53 to further limit the circumferential and axial displacement of the valve needle 30. In this embodiment, the first mounting hole 521 is a circular hole, and the second mounting hole 532 cooperates with the valve needle 30 to limit the circumferential position of the valve needle 30.

[0059] As shown in FIG12 , the fourth embodiment provided herein differs from the third embodiment in that no limiting plate 53 is provided below the pressing sleeve 54. The pressing sleeve 54 is directly fixed to the rotor connecting plate 52, and the first mounting hole 521 is configured to cooperate with the third tangent surface 34 of the valve needle 30 to limit the circumferential rotation of the valve needle 30 relative to the rotor connecting plate 52. In this embodiment, the pressing sleeve 54 is used to limit the downward movement of the valve needle 30 relative to the rotor connecting plate 52, and the limiting step on the valve needle 30 cooperates with the rotor connecting plate 52 to limit the upward movement of the valve needle 30 relative to the rotor connecting plate 52.

[0060] As shown in Figure 3, the bottom of the mounting groove 522 has an escape groove 5221, which is annularly arranged at the periphery of the mounting groove 522. The limiting plate 53 contacts the bottom of the mounting groove 522. This arrangement can compensate for the burr defect on the periphery of the mounting groove 522 caused by insufficient machining precision, making machining more convenient and improving the fit between the end face of the limiting plate 53 and the bottom surface of the mounting groove 522, thereby ensuring the precision of the fit between the limiting plate 53 and the mounting groove 522. Furthermore, the escape groove 5221 can also accommodate debris generated during the assembly process of the limiting plate 53 and the rotor connecting plate 52, preventing the limiting plate 53 from being improperly installed with the rotor connecting plate 52 due to debris.

[0061] As shown in Figures 1, 13, and 14, the valve needle 30 has an external threaded section 32, and the nut sleeve 40 has an internal threaded section 43. The external threaded section 32 and the internal threaded section 43 are threadedly engaged. The rotor assembly 50 drives the valve needle 30 to rotate, causing the valve needle 30 to move axially to adjust the flow at the valve port 21. The engagement between the external thread of the valve needle 30 and the internal thread of the nut sleeve 40 enables the valve needle 30 to rotate and move up and down relative to the nut sleeve 40, thereby causing the valve needle 30 to move axially toward or away from the valve port 21, thereby adjusting the flow at the valve port 21 and improving the control effect of the electronic expansion valve on the fluid.

[0062] The end of the valve needle 30 facing the valve port 21 forms a sealing end 33. The sealing end 33 has a first tapered section 331, the diameter of which gradually decreases as it moves away from the rotor assembly 50. The valve port 21 has a first port 211 and a second port 212 disposed opposite each other. The first port 211 faces the valve needle 30, and a chamfered structure is provided on the periphery of the first port 211. The periphery of the first port 211 has dimensions that match those of the first tapered section 331. Through this arrangement, the diameter of the first tapered section 331 gradually decreases from the sealing end 33 toward the direction away from the rotor assembly 50, thereby guiding the fluid and mitigating the impact of the fluid on the valve needle 30 and valve port 21. The chamfered structure on the first port 211 and the dimensions of the first tapered section 331 form a channel, further guiding the fluid and allowing it to flow more smoothly through the valve port 21.

[0063] Furthermore, the sealing end 33 includes a straight section 332 and a second tapered section 333. The first tapered section 331, the straight section 332, and the second tapered section 333 are sequentially connected. The diameter of the second tapered section 333 gradually decreases as it moves away from the first tapered section 331. When the valve needle 30 moves toward the valve port 21 to its lower limit, a flow gap exists between the valve needle 30 and the inner wall of the valve port 21. This arrangement allows flow to flow between the valve needle 30 and the inner wall of the valve port 21 as the sealing end 33 of the valve needle 30 moves up and down at the valve port 21 to adjust flow. When the electronic expansion valve is fully closed, a gap exists between the first tapered section 331 and the valve port 21, and a gap also exists between the sidewall of the straight section 332 and the inner wall of the valve port 21. This ensures flow even in the fully closed state.

[0064] As shown in Figures 13 and 14 , when the valve needle 30 moves toward the valve port 21 to its lower limit position, the distance between the edge of the chamfered structure near the second port 212 and the end of the straight segment 332 away from the external threaded segment 32 is L1, and the thread gap between the internal threaded segment 43 and the external threaded segment 32 is L2, where L1>L2. Through the above arrangement, when the valve needle 30 moves to its lower limit position within the nut sleeve 40, a gap remains between the first port 211 of the valve port 21 and the straight segment 332 of the valve needle 30. This allows fluid to continue to flow through the valve port 21 when the electronic expansion valve is closed. Furthermore, when fluid flows back into the valve cavity from the valve port 21, the straight segment 332 does not separate from the first port 211. This ensures that the flow rate of fluid flowing in or out of the valve port 21 remains consistent when the device is fully closed.

[0065] Furthermore, the flow area at the valve port 21 is set to gradually increase from the first port 211 to the second port 212. Through the above setting, the side wall of the valve port 21 has an inclined angle, which is more convenient to process than the straight section 332, and the fluid flows smoothly.

[0066] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0068] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0069] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0070] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0071] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. 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: The electronic expansion valve comprises: Housing (10); A valve seat (20) having a chamber therein, the valve seat (20) being provided with a valve port (21) and a communication port (22), the valve port (21) being provided at an end of the chamber away from the shell (10), the communication port (22) being provided on a side wall of the chamber, and the communication port (22) being used for connecting to a refrigerant pipeline; a valve needle (30) movably disposed in the housing (10), the valve needle (30) being used to adjust the flow rate of the valve port (21); A nut sleeve (40) having a first cut surface (200) on its side wall, a flow channel (300) being formed between the first cut surface (200) and the side wall of the chamber of the valve seat (20), the chamber being in communication with the interior of the housing (10) through the flow channel (300), and the valve needle (30) being inserted into the nut sleeve (40); Wherein, on the radial cross section of the chamber, the angle between the axis of the communication port (22) and the first section (200) is α, 45°≤α≤90°.

2. The electronic expansion valve according to claim 1, characterized in that: The chamber is a mounting chamber and a valve chamber that are interconnected, the valve port (21) is arranged at an end of the valve chamber that is away from the housing (10), and the communication port (22) is arranged on a side wall of the valve chamber.

3. The electronic expansion valve according to claim 2, characterized in that: The nut sleeve (40) comprises a first section (41) and a second section (42) which are connected in sequence along the axial direction, the first section (41) is arranged in the installation cavity, and the second section (42) is partially located in the valve cavity. A first section (200) is arranged on the side wall of the first section (41), and a circulation channel (300) is formed between the first section (200) and the side wall of the installation cavity. The valve cavity is connected to the interior of the shell (10) through the circulation channel (300), and the valve needle (30) is inserted into the nut sleeve (40).

4. The electronic expansion valve according to claim 1, characterized in that: The electronic expansion valve further comprises: a rotor assembly (50) rotatably arranged in the housing (10), the rotor assembly (50) comprising a magnetic rotor (51) and a rotor connecting plate (52), the magnetic rotor (51) being sleeved on the outside of the rotor connecting plate (52), an end of the valve needle (30) away from the valve port (21) being inserted into the rotor connecting plate (52), the magnetic rotor (51) being drivingly connected to the valve needle (30) via the rotor connecting plate (52), and the rotor assembly (50) being capable of driving the valve needle (30) to rotate in the housing (10); There is a limit structure between the rotor connecting plate (52) and the valve needle (30), and the limit The positioning structure is used to limit the valve needle (30) from rotating relative to the rotor connecting plate (52).

5. The electronic expansion valve according to claim 4, characterized in that: The rotor connecting plate (52) is provided with a first mounting hole (521) and a mounting groove (522), wherein the mounting groove (522) is located on the end surface of the rotor connecting plate (52) and is communicated with the first mounting hole (521), and the valve needle (30) is inserted into the first mounting hole (521). The rotor assembly (50) further comprises a limiting plate (53), wherein the limiting plate (53) is arranged in the mounting groove (522) and the limiting plate (53) is sleeved on the valve needle (30), and the limiting plate (53) is fixedly connected to the valve needle (30) and the rotor connecting plate (52) respectively.

6. The electronic expansion valve according to claim 5, characterized in that: The side wall of the limiting plate (53) has a second section (531), the inner wall shape of the mounting groove (522) is adapted to the outer peripheral shape of the limiting plate (53) to limit the rotation of the valve needle (30) relative to the rotor connecting plate (52), and the mounting groove (522) and the limiting plate (53) cooperate with each other to form the limiting structure.

7. The electronic expansion valve according to claim 5, characterized in that: The valve needle (30) has a connecting end (31), and the connecting end (31) is arranged away from the valve port (21). A third section (34) is arranged on the side wall of the connecting end (31). The limiting plate (53) has a second mounting hole (532). The connecting end (31) of the valve needle (30) passes through the first mounting hole (521) and the second mounting hole (532) in sequence. The inner wall shape of at least one of the first mounting hole (521) and the second mounting hole (532) is adapted to the outer peripheral shape of the connecting end (31) to limit the rotation of the valve needle (30) relative to the rotor connecting plate (52). The connecting end (31) cooperates with the first mounting hole (521) and / or the second mounting hole (532) to form the limiting structure.

8. The electronic expansion valve according to claim 5, characterized in that: The limiting plate (53) and the rotor connecting plate (52) are an integrally formed structure.

9. The electronic expansion valve according to claim 4, characterized in that: The rotor assembly (50) further includes a pressing sleeve (54), which is sleeved on the valve needle (30) and has an interference fit with the valve needle (30). The pressing sleeve (54) is located on a side of the rotor connecting plate (52) away from the valve port (21), and the pressing sleeve (54) can limit the axial position of the valve needle (30) relative to the rotor connecting plate (52).

10. The electronic expansion valve according to claim 5, characterized in that: The bottom of the installation groove (522) has an avoidance groove (5221), and the avoidance groove (5221) is arranged in an annular shape at the periphery of the installation groove (522), and the limiting piece (53) is in contact with the bottom of the installation groove (522).

11. The electronic expansion valve according to claim 4, characterized in that: The valve needle (30) has an external thread section (32), and the nut sleeve (40) has an internal thread section (43). The external thread section (32) is threadedly matched with the internal thread section (43). The rotor assembly (50) drives the valve needle (30) to rotate so that the valve needle (30) moves axially to adjust the flow at the valve port (21).

12. The electronic expansion valve according to claim 11, characterized in that: A sealing end (33) is formed at one end of the valve needle (30) facing the valve port (21), and the sealing end (33) has a first conical section (331). The diameter of the first conical section (331) gradually decreases in a direction away from the rotor assembly (50). The valve port (21) has a first port (211) and a second port (212) that are arranged opposite to each other. The first port (211) is arranged toward the valve needle (30), and a chamfered structure is arranged on the periphery of the first port (211). The periphery size of the first port (211) matches the size of the first conical section (331).

13. The electronic expansion valve according to claim 12, characterized in that: The sealing end (33) further comprises a straight section (332) and a second conical section (333), wherein the first conical section (331), the straight section (332) and the second conical section (333) are connected in sequence, and the diameter of the second conical section (333) gradually decreases in a direction away from the first conical section (331), and when the valve needle (30) moves toward the valve port (21) to a lower limit position, a flow gap is provided between the valve needle (30) and the inner wall of the valve port (21).

14. The electronic expansion valve according to claim 13, characterized in that: When the valve needle (30) moves toward the valve port (21) to the lower limit position, the distance between the edge of the chamfered structure close to the second port (212) and the end of the straight line segment (332) away from the external thread segment (32) is L1, and the thread gap between the internal thread segment (43) and the external thread segment (32) is L2, wherein L1>L2.

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