Electronic expansion valve, thermal management system with electronic expansion valve, and vehicle

Abstract

The present invention relates to an electronic expansion valve (100), a thermal management system (1000) having an electronic expansion valve, and a vehicle (10000), wherein the electronic expansion valve comprises a valve housing assembly having a valve port (11) and a housing cavity (12), wherein a valve needle assembly moves in a reciprocating manner within the housing cavity, and the valve needle (23) is defined to be switched from a fully open valve port to a fully closed valve port, the number of pulse steps performed by the rotor assembly is P, the valve port in contact with the valve needle is switched to a fully closed valve port, and the number of pass steps performed by the rotor assembly is the number of valve opening pulses E of the electronic expansion valve, where P is equal to the product of a and E, and a is greater than 12.5 but less than 20.

Description

Technical Field

[0001] Cross - reference to Related Applications This disclosure claims the priority of Chinese Patent Application No. 2023207461499, filed on March 31, 2023, the entire content of which is incorporated herein by reference.

[0002] This disclosure relates to the field of electronic expansion valves, and particularly to electronic expansion valves, thermal management systems having electronic expansion valves, and vehicles.

Background Art

[0003] Electronic expansion valves are generally used in air - conditioning systems or automotive thermal management systems to adjust the opening degree of the electronic expansion valve by controlling the voltage or current applied to the electronic expansion valve, thereby controlling the fluid flow rate in the circuit.

[0004] In related technologies, electronic expansion valves lack control accuracy, causing problems such as liquid leakage or failure to meet the operating requirements of the electronic expansion valve.

Summary of the Invention

[0005] Therefore, the present application provides an electronic expansion valve for enhancing the control accuracy of an electronic expansion valve.

[0006] [[ID=3并2]] The electronic expansion valve according to this application comprises a valve housing assembly having a valve port and a housing cavity, the valve port communicating with the housing cavity; a valve needle assembly, the valve needle assembly being arranged in a reciprocating manner in the housing cavity, the valve needle assembly comprising a valve stem, an elastic member, and a valve needle, the elastic member being positioned between a first end of the valve stem and the valve needle, the valve stem moving to drive the valve needle to open or close the valve port; and a stator assembly and a rotor assembly, the stator assembly being positioned in the valve housing assembly, the rotor assembly being positioned in the housing cavity, the stator assembly cooperating with the rotor assembly to enable the rotor assembly to rotate, and the rotor assembly is The electronic expansion valve includes a stator assembly and a rotor assembly cooperating with the valve needle assembly to drive the valve needle assembly in a reciprocating manner, defining the switching of the valve needle from a fully open state of the valve port to a fully closed state of the valve port, where P is the number of pulse steps performed by the rotor assembly, the valve needle switching from a state in contact with the valve port to a fully closed state of the valve port, where the rotor assembly performs a number of over-close steps to compress an elastic member, where the number of over-close steps is defined as the number of valve-opening pulses E of the electronic expansion valve, the electronic expansion valve satisfying the following relationship: the number of pulse steps P performed by the rotor assembly is equal to the product of a and the number of valve-opening pulses E of the electronic expansion valve, where a is greater than 12.5 and less than 20.

[0007] According to the electronic expansion valve of the present application, the rotor assembly and the valve needle assembly are coordinated so that the valve needle assembly can reciprocate, thereby selectively opening and closing the valve port. The elastic member is disposed between the valve rod and the valve needle, and the elastic member is configured to provide a pre-tightening force. The electronic expansion valve ensures the reliability of the coordination between the valve needle and the valve port, prevents liquid leakage, and at the same time ensures the opening ability of the electronic expansion valve and increases the control accuracy and qualification rate of the electronic expansion valve. To this end, the following relationship is satisfied: that is, the number P of pulse steps executed by the rotor assembly is equal to the product of a and the valve opening pulse number E of the electronic expansion valve, where a is greater than 12.5 and less than 20, that is, P = a × E, and 12.5 < a < 20.

[0008] In some embodiments, the range of the value of a is greater than 15 and less than 18.

[0009] In some embodiments, the electronic expansion valve further includes a conversion assembly. The conversion assembly is fixed in the accommodation cavity. The conversion assembly is screwed to the valve rod to ensure that the valve rod is rotatable and movable relative to the conversion assembly. The rotor assembly is fixed to the valve rod to drive the valve rod to rotate.

[0010] In some embodiments, the conversion assembly cooperates with the rotor assembly to limit the rotational speed of the rotor assembly.

[0011] In some embodiments, the conversion assembly includes a conversion member and a rotating member, the conversion member being screw-connected to a valve stem, a limiting assembly being positioned on the outer periphery of the conversion member, the rotating member being rotatably and movably positioned on the outer periphery of the conversion member, the rotating member cooperating with the limiting assembly to limit the displacement of the rotating member, and the rotor assembly includes a rotor body and a guide member, the rotor body being externally mounted on the conversion assembly, the guide member being fixed to the rotor body, a portion of the guide member extending along the direction of movement of the valve stem, and the guide member contacting the rotating member to drive the rotation of the rotating member.

[0012] In some embodiments, the guide member is fixed to the valve stem, and the free end of the valve stem extends from the guide member.

[0013] In some embodiments, the helical groove is integrally provided on the peripheral wall of the conversion member, and the rotating member is externally mounted on the outside of the conversion member and cooperates with the helical groove.

[0014] In some embodiments, the guide member and the helical groove are spaced apart from each other in the radial direction of the conversion member.

[0015] In some embodiments, a matching spring is fixed to the peripheral wall of the conversion member, a helical groove is defined between the matching spring and the peripheral wall of the conversion member, and a rotating member is externally mounted on the outside of the conversion member and aligned with the helical groove.

[0016] In some embodiments, the conversion member is provided with a fixed step, which is located at one end of the conversion member adjacent to the valve port, and one end of the matching spring is hooked onto a first end face of the fixed step facing the valve port, and at least a portion of the first end face is configured as an inclined surface, which extends inclined toward the valve port toward away from the matching spring.

[0017] In some embodiments, the portion of the rotating member that contacts the guide member is the contact portion, and the distance between the end face of the contact portion away from the central axis of the conversion member and the central axis is greater than the distance between the outer wall of the guide member and the central axis.

[0018] In some embodiments, the valve needle assembly further includes a mounting base, the valve stem cooperates with the mounting base, and an elastic member is positioned on the mounting base, with one end of the elastic member in contact with the valve stem and the other end of the elastic member in contact with the mounting base, and the valve needle is positioned on the mounting base.

[0019] In some embodiments, a first gap is located between the mounting base and the inner wall of the valve housing assembly, and the mounting base is provided with a balancing hole, which connects the internal space of the mounting base to the first gap.

[0020] In some embodiments, a second gap is located between the valve needle and the inner wall of the valve housing assembly, and the first gap is larger than the second gap.

[0021] In some embodiments, the valve port includes a first portion and a second portion, the first portion being located on the side of the second portion that is close to the valve needle, the cross-sectional area of ​​the first portion gradually decreasing and the cross-sectional area of ​​the second portion gradually increasing in the direction away from the valve needle, and the outer wall surface of the valve needle contacts the first portion when the valve needle fully closes the valve port.

[0022] Another objective of this application is to provide a thermal management system.

[0023] The thermal management system according to this application includes the electronic expansion valve described above.

[0024] Since the above-described electronic expansion valve is provided in the heat management system, the valve needle assembly can reciprocate by the cooperation between the rotor assembly and the valve needle assembly, thereby selectively opening and closing the valve port. The elastic member is disposed between the valve rod and the valve needle, and the elastic member may be configured to provide a pre-tightening force. The electronic expansion valve improves the control effect of the heat management system by ensuring the reliability of the cooperation between the valve needle and the valve port, preventing liquid leakage, simultaneously ensuring the opening ability of the electronic expansion valve, and increasing the control accuracy of the electronic expansion valve. Therefore, it is configured to satisfy the following relationship, that is, the number of pulse steps P executed by the rotor assembly is equal to the product of a and the valve opening pulse number E of the electronic expansion valve, where a is greater than 12.5 and less than 20.

[0025] Another object of the present application is to provide a vehicle.

[0026] The vehicle according to the present application includes the above-described heat management system.

[0027] Since the above-described electronic expansion valve is provided in the heat management system, the valve needle assembly can reciprocate by the cooperation between the rotor assembly and the valve needle assembly, thereby selectively opening and closing the valve port. The elastic member is disposed between the valve rod and the valve needle, and the elastic member may be configured to provide a pre-tightening force. The electronic expansion valve improves the control effect of the heat management system by ensuring the reliability of the cooperation between the valve needle and the valve port, preventing liquid leakage, simultaneously ensuring the opening ability of the electronic expansion valve, and increasing the control accuracy of the electronic expansion valve. Thereby, it further improves the heat management effect of the heat management system for the vehicle and improves the user experience. Therefore, it is configured to satisfy the following relationship, that is, the number of pulse steps P executed by the rotor assembly is equal to the product of a and the valve opening pulse number E of the electronic expansion valve, where a is greater than 12.5 and less than

[0028] 20.

[0028] Additional aspects and advantages of the present application will be described in part below, and some of them will become apparent from that description or will be understood by practicing the present application.

[0029] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings.

Brief Description of the Drawings

[0030] [Figure 1] It is a schematic structural diagram of an electronic expansion valve according to some embodiments of the present application when the valve port is fully closed. [Figure 2] It is an enlarged view of the circle J in FIG. 1. [Figure 3] It is a schematic structural diagram of an electronic expansion valve according to some embodiments of the present application when the valve port is fully open. [Figure 4] It is a schematic diagram of a valve needle assembly according to some embodiments of the present application. [Figure 5] It is a schematic structural diagram of a conversion assembly according to some embodiments of the present application. [Figure 6] It is a schematic partial structural diagram of an electronic expansion valve according to some other embodiments of the present application. [Figure 7] It is an enlarged view of the circle K in FIG. 6. [Figure 8] It is an enlarged view of the circle M in FIG. 6. [Figure 9] It is a second partial structural diagram of an electronic expansion valve according to some other embodiments of the present application. <00> [Figure 10] It is an enlarged view of the circle N in FIG. 9. [Figure 11] It is a third partial structural diagram of an electronic expansion valve according to some other embodiments of the present application. [Figure 12] It is an enlarged view of the circle O in FIG. 11. [Figure 13] It is a schematic structural diagram of a conversion assembly according to some other embodiments of the present application. [Figure 14] It is an enlarged view of the circle Q in FIG. 13. [Figure 15] These are schematic diagrams of vehicles according to several embodiments of this application. [Modes for carrying out the invention]

[0031] Embodiments of this application are described in detail below, examples of embodiments are shown in the accompanying drawings, and the same or similar reference numerals throughout represent the same or similar elements, or elements having the same or similar function. The embodiments described below with reference to the accompanying drawings are illustrative and used solely for the purpose of describing this application and should not be understood as limiting this application.

[0032] In this description, terms such as “center,” “top,” “bottom,” “inside,” “outside,” “axial,” “radial,” and “circumferential,” which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings and should be understood not as indicating or implying that the referenced device or element must have a particular orientation, be constructed in a particular orientation, or be operated in a particular orientation, and therefore cannot be understood as limiting this application, but rather as merely for the convenience of describing and simplifying this description. In addition, features defined as “first” and “second” may explicitly or implicitly include one or more of those features. In this description, unless otherwise stated, “multiple” means two or more.

[0033] In the description of this application, unless otherwise explicitly stated and limited, the terms “installed,” “connected,” and “connect” should be understood broadly, for example, that they may be fixed, removable, or integral connections; mechanical or electrical connections; direct connections; indirect connections via an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meaning of these terms in this application on a case-by-case basis.

[0034] An electronic expansion valve 100 according to an embodiment of this application will be described in detail below with reference to Figures 1 to 14.

[0035] Referring to Figures 1 to 3, the electronic expansion valve 100 according to this application includes a valve housing assembly, a valve needle assembly 20, a stator assembly 30, and a rotor assembly, wherein the valve housing assembly is provided with a valve port 11 and a housing cavity 12, the valve port 11 is in communication with the housing cavity 12, the valve needle assembly 20 is reciprocally arranged in the housing cavity 12, the valve needle assembly 20 includes a valve stem 21, an elastic member 22, and a valve needle 23, the elastic member 22 is, A valve stem 21 is positioned between the first end of the valve stem 21 and the valve needle 23, and the valve stem 21 moves to drive the valve needle 23 to move to open or close the valve port 11; the stator assembly 30 is positioned in the valve housing assembly, and the rotor assembly is positioned in the housing cavity 12; the stator assembly 30 and the rotor assembly cooperate to make the rotor assembly rotatable, and the rotor assembly cooperates with the valve needle assembly 20 to drive the valve needle assembly 20 to reciprocate.

[0036] In some embodiments, the stator assembly 30 is mounted on the valve housing assembly and is positioned opposite the rotor assembly. When the stator assembly 30 is energized, a changing magnetic field is generated to drive the rotor assembly to rotate. The rotor assembly may be drive-connected to the valve stem 21 to drive the valve stem 21 to reciprocate within the housing cavity 12. The end of the valve stem 21 adjacent to the valve port 11 is defined as the first end of the valve stem 21. The first end of the valve stem 21 is connected to the valve needle 23. The valve needle 23 can be used to close the valve port 11, and the reciprocating movement of the valve stem 21 drives the valve needle 23 to selectively open and close the valve port 11.

[0037] When the rotor assembly drives the valve stem 21 toward the valve port 11, the valve stem 21 can drive the valve needle 23 toward the valve port 11. As shown in Figures 1 and 2, the valve needle 23 is inserted into the valve port 11 such that the valve needle 23 closes the valve port 11, thereby closing the electronic expansion valve 100. As shown in Figure 3, when the rotor assembly drives the valve stem 21 toward the valve port 11, the valve stem 21 can drive the valve needle 23 toward the valve port 11 such that it switches the valve port 11 from a closed state to an open state.

[0038] When the valve needle 23 contacts the valve port 11 and switches the valve port 11 to a fully closed state, the stator assembly 30 remains coupled to the rotor assembly to ensure that the rotor assembly continues to perform a certain number of over-close steps, and the rotor assembly continues to drive the valve stem 21 toward the valve port 11. At this time, because the valve needle 23 is in contact with the valve port 11, the elastic member 22 is compressed by the pressure of the valve stem 21 to ensure that the elastic member 22 generates a pre-tightening force, and the valve port becomes fully closed.

[0039] Furthermore, when the valve needle 23 fully opens the valve port 11 and switches to fully closing the valve port 11, the number of pulse steps executed by the rotor assembly is defined as P. When the valve needle 23 contacts the valve port 11 and switches to fully closing the valve port 11, the rotor assembly executes the number of over-closing steps for compressing the elastic member 22. The number of over-closing steps is defined as the valve opening pulse number E of the electronic expansion valve 100. The electronic expansion valve 100 satisfies the following relationship, that is, the number of pulse steps P executed by the rotor assembly is equal to the product of a and the valve opening pulse number E of the electronic expansion valve 100, where a is greater than 12.5 and less than 20, that is, P = a × E and 12.5 < a < 20.

[0040] In some embodiments, "the valve needle 23 fully closes the valve port 11" means that the elastic member 22 generates a pre-tightening force to press the valve needle 23 in order to ensure that the valve needle 23 can reliably fit with the valve port 11. "The valve needle 23 contacts the valve port 11" means that the valve needle 23 closes the valve port 11, and at this time the elastic member 22 does not generate a pre-tightening force, thereby not generating the number of pulse steps P executed by the electronic expansion valve 100 including the valve opening pulse number E of the electronic expansion valve 100.

[0041] With such a configuration, when the valve needle 23 fully closes the valve port 11, the pre-tightening force can press the valve needle 23. When a is greater than 12.5, the alignment certainty between the valve needle 23 and the valve port 11 can be guaranteed, and when exposed to fluid pressure, the valve needle 23 can be prevented from coming out of the valve port 11, thereby guaranteeing the sealing performance of the electronic expansion valve 100 at full closure and preventing leakage of the electronic expansion valve 100. When a is less than 20, the opening ability of the electronic expansion valve 100 can be guaranteed, and it can be prevented that the valve cannot be properly opened due to excessive pre-tightening force. The situation that the elastic member is excessively deformed and loses its elastic force due to the valve opening pulse number E being excessively large can be further avoided, thereby improving the control accuracy and qualification rate of the electronic expansion valve 100.

[0042] According to the electronic expansion valve 100 of this application, the rotor assembly and the valve needle assembly 20 are coordinated to allow the valve needle assembly 20 to reciprocate, thereby selectively opening and closing the valve port 11, and an elastic member 22 is positioned between the valve stem 21 and the valve needle 23, and the elastic member 22 is configured to provide a pre-tightening force, and the electronic expansion valve 100 is configured to satisfy the following relationship, namely, the number of pulse steps P performed by the rotor assembly is equal to the product of a and the number of valve opening pulses E of the electronic expansion valve, where a is greater than 12.5 and less than 20, in order to ensure the reliability of the coordination between the valve needle 23 and the valve port 11, prevent leakage, and at the same time ensure the opening capability of the electronic expansion valve 100, and increase the control accuracy and pass rate of the electronic expansion valve 100.

[0043] In some embodiments of this application, the range of the value of a is greater than 15 and less than 18.

[0044] In some embodiments, configuring a to be greater than 15 and less than 18 improves the valve opening performance of the electronic expansion valve 100, ensures reliable cooperation between the valve needle 23 and the valve port 11, and further improves the control accuracy and product pass rate of the electronic expansion valve 100.

[0045] Referring to Figures 1 and 3, in some embodiments of the present application, the valve housing assembly includes a valve seat 13, a valve body 14, and a valve housing 15, wherein the valve seat 13 is provided with an assembly chamber and a plurality of fluid passages 131, the plurality of fluid passages 131 communicating with the assembly chamber, the assembly chamber is configured to house the valve body 14, a valve port 11 and a connecting passage 141 connected to the valve port 11 are formed in the valve body 14, the valve port 11 and the connecting passage 141 are connected to different fluid passages 131 respectively, and the valve housing 15 cooperates with at least one of the valve seat 13 and the valve body 14 to define a housing cavity 12.

[0046] In some embodiments, multiple fluid passages 131 are located at different positions on the valve seat 13, the valve body 14 is mounted on the valve seat 13, and each of the multiple fluid passages 131 is connected to an external component (e.g., a pipe for circulating a medium, a heat exchanger, and other components of the thermal management system 1000). When valve port 11 is open and acts as an outlet, fluid can flow in from one of the fluid passages 131 and out through a connecting passage 141 and valve port 11 to another fluid passage 131, thereby realizing the conduction function of the electronic expansion valve. When valve port 11 is open and acts as an inlet, fluid can flow in from one of the fluid passages 131 to the valve port and connecting passage 141, and then out through another fluid passage 131, thereby realizing the coupling function of the electronic expansion valve.

[0047] Naturally, it can be understood that when the valve needle 11 closes the valve port, a portion of the valve needle 11 is inserted into the connecting channel 141, thereby blocking the flow of fluid in the connecting channel 141.

[0048] Furthermore, the stator assembly 30 is externally mounted on the valve housing 15, and the stator assembly 30 can be fixedly connected to the valve seat 13 by the stator bracket 31, the rotor assembly is installed in the housing cavity 12, the stator assembly 30 and the rotor assembly are positioned facing each other, and when the stator assembly 30 is energized, a changing magnetic field is generated to drive the rotor assembly to rotate, and the rotor assembly is fixedly connected to the valve needle assembly 20 to ensure that the rotor assembly can operate in conjunction with the valve needle assembly 20.

[0049] Referring to Figures 11 and 12, in some embodiments of this application, the valve housing 15 and the valve body 14 are press-fitted together.

[0050] In some embodiments, a valve housing 15 is fitted axially to the valve body 14, and the valve housing 15 and valve body 14 may be welded together to ensure a fixed connection between the valve housing 15 and the valve body 14. The interlocking fit between the valve body 14 and the valve housing 15 can prevent the valve body 14 and the valve housing 15 from falling out or the valve body 14 from becoming distorted after being welded to the valve housing 15.

[0051] In some embodiments, the interference fit dimension h between the valve body 14 and the valve housing 15 is between 0.8 mm and 1.5 mm, including both ends of the range, and within this range, the interference fit size between the valve body 14 and the valve housing 15 is selected to be 1.2 mm in order to prevent the valve housing 15 and the valve body 14 from not fitting properly, or to prevent deformation of the valve body 14 due to a thinner wall thickness of the valve housing 15, a larger interference fit between the valve body 14 and the valve housing 15, or a longer interference fit distance.

[0052] Referring to Figures 1, 4, and 5, in some embodiments of the present application, the electronic expansion valve 100 further includes a converter assembly 50, the converter assembly 50 is fixed to a housing cavity 12, the converter assembly 50 is screw-connected to the valve stem 21 to ensure that the valve stem 21 can rotate and move relative to the converter assembly 50, and a rotor assembly is fixed to the valve stem 21 to drive the valve stem 21 to rotate.

[0053] In some embodiments, the conversion assembly 50 is located in the housing cavity 12 and can be fixedly connected to the valve body 14, and the valve stem 21 can be screw-connected to the conversion assembly 50, with the end of the valve stem 21 facing away from the valve port 11 fixedly connected to a rotor assembly, which can drive the valve stem 21 to rotate relative to the conversion assembly 50, and at the same time, the screw connection between the valve stem 21 and the conversion assembly 50 can convert the rotation of the valve stem 21 into movement along the axial direction of the valve stem 21. The valve stem 21 drives the valve needle 23 to move along the axial direction of the valve stem 21 in order to selectively open or close the valve port 11.

[0054] In some embodiments of this application, the conversion assembly 50 cooperates with the rotor assembly to limit the rotational speed of the rotor assembly, thereby limiting the range of motion of the valve stem 21 by limiting the rotational speed of the rotor assembly, and limiting the range of motion of the valve needle 23 by limiting the range of motion of the valve stem 21, thereby achieving precise control of the valve needle 23 and further improving the control accuracy and pass rate of the electronic expansion valve.

[0055] In some embodiments, referring to Figures 1 and 3, the rotor assembly is drive-connected to a converter assembly 50, and the rotor assembly can rotate relative to the converter assembly 50, and at the same time, the rotor assembly can move relative to the converter assembly 50 along the axial direction of the converter assembly 50, and the converter assembly 50 can be limit-fitted with the rotor assembly to limit the rotational speed of the rotor assembly by limiting the distance the rotor assembly moves relative to the converter assembly 50.

[0056] As shown in Figure 5, in some embodiments of the present application, the conversion assembly 50 includes a conversion member 51 and a rotating member 52, wherein the conversion member 51 is screw-connected to a valve stem 21, a limiting assembly is positioned on the outer circumference of the conversion member 51, and the rotating member 52 is rotatably and movably positioned on the outer circumference of the conversion member 51, the rotating member 52 cooperates with the limiting assembly to limit the movement displacement of the rotating member 52, and the rotor assembly cooperates with the rotating member 52 to push and rotate the rotating member 52.

[0057] In some embodiments, referring to Figures 1, 5, and 6, the rotating member 52 can rotate relative to the conversion member 51, and the rotor assembly can be tightly fitted with the rotating member 52 in order to push the rotating member 52 and rotate it relative to the conversion member 51, so that the rotating member 52 rotates relative to the conversion member 51 and moves along its axial direction, thereby achieving coordination between the rotor assembly and the rotating member 52.

[0058] Referring further to Figure 6, the limiting assembly can restrict the displacement of the rotating member 52 relative to the conversion member 51, that is, the limiting assembly can restrict the rotational speed of the rotating member 52 and the axial travel distance of the rotating member 52 relative to the conversion member 51. Since the rotor assembly and the rotating member 52 are in transmission cooperation, when the rotating member 52 and the limiting assembly are cooperating to a limited extent, the rotor assembly can be restricted from continuing to rotate, thereby limiting the rotational speed of the rotor assembly. Therefore, the structure of the conversion assembly 50 is simple.

[0059] Referring to Figures 1 and 3, the rotor assembly includes a rotor body 41 and a guide member 42. The rotor body 41 is externally mounted on the conversion assembly 50, and the guide member 42 is fixed to the rotor body 41. A portion of the guide member 42 extends along the direction of movement of the valve stem 21, and the guide member 42 contacts the rotating member 52.

[0060] Referring to Figures 1 and 6, at least a portion of the conversion assembly 50 is positioned on the rotor body 41, the guide member 42 is positioned on the rotor body 41, the connecting plate 43 is positioned on one end of the rotor body 41 facing away from the valve port 11, the connecting plate 43 is fixedly connected to the inner wall surface of the rotor body 41, the guide member 42 is fixedly connected to the connecting plate 43 to ensure that the guide member 42 is fixedly connected to the rotor body 41, and the rotor body 41 rotates the guide member 42 synchronously. The guide member 42 can be driven in such a manner, and at the same time, a portion of the guide member 42 extends along the axial direction of the conversion member 51 to facilitate contact and cooperation with the rotating member 52, and the guide member 42 and the rotating member 52 contact and cooperate to realize the rotor body 41 moving on the conversion member 51 by the guide member 42 which drives the rotating member 52, and furthermore, the conversion member 51 can avoid the guide member 42 to prevent the conversion member 51 from interfering with the movement of the guide member 42 and affecting the movement effect of the rotor assembly. Naturally, it can be understood that the manner in which the guide member 42 and the rotor body 41 are fixed is not limited to this, as long as the rotor body 41 can be coupled to the stator assembly, rotated and fixed while driving the guide member 42 to rotate.

[0061] Furthermore, the limiting assembly cooperates with the rotating member 52 to restrict the movement of the rotating member 52 relative to the conversion member 51, and the rotating member 52 contacts and engages with the guide member 42 to restrict the movement of the guide member 42, thereby limiting the rotational speed of the rotor assembly by setting the limiting assembly.

[0062] In some embodiments of this application, the gap between the rotor assembly and the inner wall of the valve housing 15 is 0.35 mm to 0.4 mm, including the values ​​at both ends.

[0063] In some embodiments, the rotor body 41 is separated from the valve housing 15 to prevent the valve housing 15 from interfering with the movement of the rotor assembly, and the gap between the outer wall of the rotor body 41 and the inner wall of the valve housing 15 is set between 0.35 mm and 0.4 mm to prevent the distance between the stator assembly 30 and the rotor assembly from becoming excessively large, thereby ensuring the driving effect of the stator assembly 30 on the rotor assembly, and at the same time, to prevent the stator assembly 30 from failing to drive the rotor assembly due to vibration of the rotor assembly, thereby ensuring the normal operation of the electronic expansion valve 100.

[0064] As shown in Figure 5, in some embodiments of this application, the helical groove is integrally formed on the outer circumferential wall of the conversion member 51, and the rotating member 52 is externally mounted on the outside of the conversion member 51 and cooperates with the helical groove.

[0065] In some embodiments, the helical groove and the conversion member 51 are integrally formed to facilitate the assembly of the electronic expansion valve 100 and to simplify the structure of the electronic expansion valve 100, the helical groove is located on the conversion member 51 and the rotating member 52 can be located on the helical groove and the rotating member 52 can rotate on the helical groove and move along its axial direction by setting a limiting assembly and limiting the length of the helical groove, the movable distance of the rotating member 52 is limited and the rotating member 52 cooperates with the rotor assembly to limit the number of rotations the rotor assembly can rotate.

[0066] The conversion member 51 may be configured as a nut having an internal thread and a helical groove, and the nut may be fixed to the valve body 14 through a nut placement sheet 241 to enable the conversion assembly 50 to be fixed to the valve body 14. Referring to Figures 1, 3, and 5, the valve stem 21 may be configured as a screw having an external thread structure, which can be inserted into the nut and screw-connected to the internal thread, and the rotating member 52 may move relative to the conversion member 51 through the helical groove, and of course, the above-described structures of the conversion member 51 and valve stem 21 are one embodiment of the present application and should not be interpreted as limiting the present application.

[0067] As shown in Figure 5, in some embodiments of the present application, the limiting assemblies are a first limiting assembly 61 and a second limiting assembly 62, spaced apart along the direction of movement of the valve stem 21, and the rotating member 52 abuts against one of the first limiting assembly 61 and the second limiting assembly 62 to restrict the movement of the rotating member 52. It should be noted, of course, that by controlling the rotor assembly to perform a number of over-closing steps, the rotating member 52 can be positioned at any position between the first limiting assembly 61 and the second limiting assembly 62 to control the cooperation between the valve needle 23 and the valve port 11, adjust the opening of the valve port 11, and thereby achieve the objective of adjusting the flow rate.

[0068] In some embodiments, the first limiting assembly 61 and the second limiting assembly 62 are spaced apart in the axial direction of the conversion member 51. Considering this case, for example, if the first limiting assembly body 61 is located at the end of the helical groove away from the valve port 11, and the second limiting assembly body 62 is located at the end of the helical groove close to the valve port 11, then as shown in Figure 5, when the rotating member 52 rotates to the end of the helical groove away from the valve port 11, the first limiting assembly 61 and the rotating member 52 come into contact and cooperate to restrict the rotating member 52 from continuing to rotate, and the rotating member 52 is close to the valve port 11. As it rotates to the end of the helical groove, the second limiting assembly 62 and the rotating member 52 contact and cooperate to restrict the rotating member 52 from continuing to rotate, and the rotor assembly cooperates with the rotating member 52 by transmission to limit the rotational speed of the rotating member 52, thereby limiting the rotational speed of the rotor assembly, and the rotor assembly is connected to the valve stem 21 to limit the distance the valve stem 21 can move by limiting the rotational speed of the rotor assembly, and the distance the valve needle 23 can move is limited by limiting the distance the valve stem 21 can move, thereby achieving precise control of the valve needle 23.

[0069] The first limiting assembly 61 and the second limiting assembly 62 may be configured as limiting protrusions extending along the radial direction of the conversion member 51, and the limiting protrusions can contact and cooperate with the rotating member 52 in a direction perpendicular to the axis of the conversion member 51 so as to limit the rotation of the rotating member 52, thereby limiting the rotational speed of the rotor assembly.

[0070] As shown in Figure 13, in some other embodiments of the present application, the alignment spring 53 may be fixed to the outer circumferential wall of the conversion member 51, with both ends of the alignment spring 53 fixed to the conversion member 51, and the alignment spring 53 and the outer circumferential wall of the conversion member 51 cooperate to define a helical groove, and the rotating member 52 cooperates with the helical groove to move relative to the conversion member 51 during the rotation process.

[0071] Referring further to Figure 14, the conversion member 51 is further provided with a fixed step 63, which is located at one end of the conversion member 51 adjacent to the valve port 11, and one end of the matching spring 53 is fixed to the fixed step 63. Furthermore, one end of the matching spring 53 can be hooked onto the first end face 631 of the fixed step 63 facing the valve port.

[0072] Referring to Figures 13 and 14, in further examples of the present application, at least a portion of the first end face 631 is formed as an inclined surface, the slope of which may extend obliquely toward the valve port away from the alignment spring 53, and the inclination angle β between the first end face 631 and the horizontal plane may be set to 5° to prevent one end of the alignment spring 53 from falling off.

[0073] Referring to Figures 1, 5, and 6, in some further embodiments of the present application, the rotating member 52 may be configured as a stop ring, the stop ring having a contact portion 521 extending radially away from the conversion member 51, the stop portion 521 configured to cooperate with a guide member 42, the guide member 42 driving the rotating member 52 to rotate by cooperating with the contact portion 521, the limiting assembly limiting the rotational speed of the rotating member 52 by cooperating with the end of the stop ring, the rotating assembly being connected to the rotor assembly to limit the rotational speed of the rotor assembly.

[0074] Referring further to Figure 6, the end face of the contact portion 521 away from the central axis of the conversion member 51 is separated from the wall surface (outer wall) of the guide member 42 away from the central axis of the conversion member 51. The distance between the end face of the contact portion 521 away from the central axis of the conversion member 51 and the central axis of the conversion member 51 is greater than the distance between the outer wall of the guide member 42 and the central axis of the conversion member 51. This ensures a contact effect between the guide member 42 and the contact portion 521, thereby preventing failure of the rotor assembly to fit with the rotating member 52 due to a failure of the fit between the guide member 42 and the contact portion 521 during the process of driving the rotating member 52 to rotate. Considering the actual machining angles and tolerances, the distance E between the end face of the contact portion 521 away from the central axis of the conversion member 51 and the outer wall of the guide member 42 is selected to be 1.4 mm.

[0075] At the same time, the end face of the contact portion 521 away from the central axis of the conversion member 51 and the inner wall surface of the movable body 41 are spaced apart to prevent friction between them, as this friction could cause partial malfunctions or interference with the movement process of the rotor assembly and the rotating member 52 to prevent malfunctions of the electronic expansion valve 100. In some embodiments, taking into account the actual machining angles and tolerances, the distance F between the end face of the contact portion 521 away from the central axis of the conversion member 51 and the inner wall surface of the rotor body 41 is configured to be 0.5 mm, and the angle α defined between the axially extending portion of the guide member 42 and the connecting plate 43 is between 87.7° and 94.3°, and in some embodiments, α is configured to be 90° to prevent friction between the guide member 42 and the rotor body 41 and to prevent malfunctions of the parts.

[0076] Referring further to Figures 6 and 11, in order to prevent the stop ring from engaging with the guide member 42 as it moves axially, the distance G between the end of the guide member 42 adjacent to the valve port 11 and the connecting plate 43 in the axial direction is greater than the distance between the stop ring and the connecting plate 43 when the stop ring is closest to the valve port 11 (the distance between the stop ring and the connecting plate 43 when the valve port 11 is fully closed), thereby ensuring effective contact engagement between the stop ring and the guide member 42. Taking into account the actual machining angles and tolerances, the distance G between the end of the guide member 42 adjacent to the valve port 11 and the connecting plate 43 is selected to be 15.2 mm.

[0077] In addition, referring to Figures 6 and 11, the guide member 42 and the helical groove of the conversion member 51 are radially separated to prevent the guide member 42 from rubbing against the helical groove during rotation and causing partial malfunctions. Taking into account actual machining and assembly errors, the distance H between the wall surface (inner wall) of the guide member 42 close to the central axis of the conversion member 51 and the helical groove is selected to be 0.7 mm.

[0078] As shown in Figure 6, in some embodiments of this application, the guide member 42 is fixed to the valve stem 21, and the free end of the valve stem 21 extends from the guide member 42. Thus, the secure fixation between the valve stem 21 and the guide member 42 can be guaranteed.

[0079] Furthermore, the connecting plate 43 is fixedly connected to the inner wall surface of the rotor body 41, the valve stem 21 is fixedly connected to the connecting plate 43, and the guide member 42 is fixedly connected to the connecting plate 43 to ensure that the guide member 42 is fixedly connected to the valve stem 21, so that the rotor assembly can drive the valve stem 21 to rotate relative to the conversion member 51. Since the valve stem 21 and the conversion member 51 are screwed together, the valve stem 21 can move along the axial direction of the conversion member 51 while rotating relative to the conversion member 51, thereby driving the valve needle 23 to selectively open or close the valve port 11.

[0080] As shown in Figure 6, in a further embodiment of the present application, the valve stem 21 may be welded to the connecting plate 43, and the free end of the valve stem 21 (defined as the end of the valve stem 21 away from the valve needle 23) is passed through the connecting plate 43 to improve the stability of the valve stem 21, prevent the end of the valve stem 21 from swaying, and improve the transmission effect of the valve stem 21, and the distance I between the upper end of the free end of the valve stem 21 and the upper end of the connecting plate 43 is selected to be 2.0 mm to ensure the weld strength between the valve stem 21 and the connecting plate 43.

[0081] The valve stem 21 and the connecting plate 43 are fitted together before welding to prevent deflection of the valve stem 21 and the connecting plate 43. The fitting height between the valve stem 21 and the connecting plate 43 is rationally designed according to the outer diameter of the valve stem 21 and the gap size between the valve stem 21 and the connecting plate 43. Note that in some embodiments, the gap tolerance between the valve stem 21 and the connecting plate 43 is +0.005 to +0.04, and the ratio of the fitting height between the valve stem 21 and the connecting plate 43 to the outer diameter of the valve stem 21 (i.e., the aspect ratio) is selected to be 1.75.

[0082] In the embodiments shown in Figures 1 and 3 of this application, the guide member 42 is directly connected to the rotor body 41, and the guide member 42 is constructed in an L-shape, having a portion that extends along the direction of movement of the valve stem 21 and a portion that extends in a direction perpendicular to the direction of movement of the valve stem 21, and when the guide member 42 is directly connected to the rotor body 41, the free end of the valve stem 21 is inserted into the portion of the guide member 42 that extends in a direction perpendicular to the direction of movement of the valve stem 21.

[0083] Referring to Figures 1 and 4, in some embodiments of this application, the valve needle assembly 20 further includes a mounting base 24, the valve stem 21 cooperates with the mounting base 24, and an elastic member 22 is positioned on the mounting base 24, with one end of the elastic member 22 in contact with the valve stem 21 and the other end in contact with the mounting base 24, and the valve needle 23 is positioned on the mounting base 24.

[0084] In some embodiments, referring to Figure 4, the mounting base 24 may be constructed as a spring sleeve, with a bushing 25 fixedly positioned at the end of the spring sleeve facing away from the valve port 11, and the valve stem 21 may be inserted into the bushing 25 and extend into the spring sleeve, and the bushing 25 can perform a sealing role between the valve stem 21 and the spring sleeve, thereby improving the sealing effect between the valve stem 21 and the spring sleeve, and at the same time the bushing 25 can reduce friction between the spring sleeve and the valve stem 21, thereby improving the service life of the electronic expansion valve 100.

[0085] The valve stem 21 can slide axially within the spring sleeve, and a restricting fitting portion 211 is provided at the end of the valve stem 21 adjacent to the valve needle 23, the restricting fitting portion 211 can cooperate with a bushing 25, the restricting fitting portion 211 and the bushing 25 can contact and cooperate axially to prevent the valve stem 21 from coming out of the spring sleeve, and at the same time the valve stem 21 can drive the spring sleeve to move axially through the restricting fitting portion 211, the radial dimension of the restricting fitting portion 211 may be the same as the inner diameter dimension of the spring sleeve to ensure that the restricting fitting portion 211 can contact and cooperate with the inner circumferential wall of the spring sleeve, thereby improving the matching stability of the valve stem 21 and the spring sleeve and preventing the valve stem 21 from vibrating.

[0086] Referring further to Figures 1 and 4, the bearing 26 is fixed to the end of the spring sleeve near the valve port 11, the bearing 26 is positioned in the spring sleeve, the valve needle 23 is fixedly connected to the inner ring of the bearing 26, and the elastic member 22 may be configured as a spring, one end of which is in contact with the valve stem 21 and the other end of which is in contact with the bearing 26. When the rotor assembly is driven to move the valve stem 21 toward the valve port 11, the valve stem 21 presses against the spring, and the spring tends to drive the bearing 26 toward the valve port 11. The bearing 26 drives the spring sleeve to move toward the valve port 11, and as a result, the valve stem 21 drives the spring sleeve to move toward the valve port 11, and at the same time, the spring sleeve drives the valve needle 23 to move toward the valve port 11 through the bearing 26 to ensure that the valve needle 23 closes the valve port 11, thereby achieving closure of the electronic expansion valve 100.

[0087] In addition, the spring can press against the bearing 26 to prevent the spring sleeve from slipping axially, thereby ensuring reliable alignment between the valve needle 23 and the valve port 11 when the electronic expansion valve 100 is closed, and preventing the electronic expansion valve 100 from leaking.

[0088] When the rotor assembly drives the valve stem 21 to move away from the valve port 11, the valve stem 21 drives the spring sleeve to move away from the valve port 11 through the restricting fitting portion 211, and the spring sleeve drives the valve needle 23 to move away from the valve port 11 through the bearing 26 to achieve opening of the electronic expansion valve 100.

[0089] Referring to Figures 6 and 10, in some further embodiments of the present application, the spring sleeve is superimposed on the bushing 25 and fixed and connected to the bushing 25 by welding, and after the spring sleeve is welded to the bearing 26, a weld scar is formed in an overlap seam, and the orthographic projection of the weld scar is positioned radially inward of the orthographic projection of the spring sleeve, that is, the outer surface of the weld scar and the outer wall of the spring sleeve are radially separated, and the distance between the outer surface of the weld scar and the central axis of the conversion member 51 is smaller than the distance between the outer wall of the spring sleeve and the central axis of the conversion member 51, so as to prevent the weld scar from contacting the valve housing assembly during movement and immobilizing the spring sleeve.

[0090] Referring further to Figure 10, the axial dimension of the weld is smaller than the sum of the axial dimension e of the bushing 25 protruding from the upper end of the spring sleeve and the axial dimension f of the upper end of the spring sleeve, and in some embodiments, e is equal to 0.5 and f is equal to 1.2 to ensure that the weld can cover the overlapping seam between the spring sleeve and the bushing 25, thereby improving the connection strength between the bushing 25 and the spring sleeve.

[0091] In some other embodiments of this application, the elastic member 22 may contact the valve needle 23, insofar as it can drive the valve stem 21 to move the valve needle 23 synchronously.

[0092] In some embodiments of this application, an escape space is provided at the end of the converter member 51 near the valve port 11, and when the rotor assembly drives the valve stem 21 to move away from the valve port 11, the valve stem 21 can drive the spring sleeve to move away from the valve port 11, and at least a portion of the spring sleeve can be moved into the escape space of the converter member 51 in order to reduce the axial dimension of the electronic expansion valve 100.

[0093] Referring to Figures 6 and 8, in some embodiments of this application, a first gap 143 is provided between the mounting base 24 and the inner wall of the valve housing assembly, and the mounting base 24 is provided with a balance hole that connects the internal space of the mounting base 24 with the first gap 143.

[0094] In some embodiments, a first gap 143 is formed radially between the mounting base 24 and the valve body 14, and a balance hole is formed circumferentially in the side wall of the mounting base 24, the balance hole being positioned through the side wall of the mounting base 24 so as to connect the internal space of the mounting base 24 with the first gap 143.

[0095] When the valve needle 23 opens the valve port 11 to allow fluid to pass through the electronic expansion valve 100, a portion of the fluid that flows through the first gap 143 can flow through the balance hole to the mounting base 24, thereby achieving the purpose of releasing pressure, thereby reducing the fluid pressure as the fluid flows through the electronic expansion valve 100, ensuring the stability of the internal pressure of the electronic expansion valve 100, ensuring the normal operation of the electronic expansion valve 100, increasing the service life of the electronic expansion valve 100, and at the same time reducing the turbulence generated as the fluid flows through the electronic expansion valve 100, thereby effectively reducing the noise generated when the electronic expansion valve 100 is opened.

[0096] Furthermore, in order to ensure that the fluid pressure balance is rapidly achieved after the fluid enters the electronic expansion valve 100 and to reduce fluctuations in the fluid pressure in the thermal management system 1000, the cross-sectional area of ​​the balance hole must be larger than the cross-sectional area of ​​the first gap 143, where the diameter of the balance hole is set to d, the diameter of the first passage for installing the mounting base 24 is set to c, the diameter of the mounting base 24 is set to b, and the cross-sectional area of ​​the balance hole is given by the following relationship, i.e., (πd 2 / 4)>π(c 2 -b 2) / 4×2, that is, the product of π and the square of the diameter of the equilibrium hole divided by 4 is greater than the product of π, the value obtained by dividing the difference between the square of the diameter of the first passage and the square of the diameter of the mounting seat 24 by 4, and 2. In some embodiments, to ensure the stability of the internal pressure of the electronic expansion valve 100 and to ensure the normal operation of the electronic expansion valve 100, c is equal to φ6.2, b is equal to φ6.1, and d is equal to φ1.

[0097] Referring to Figures 6, 7, and 8, in some embodiments of the present application, a movable passage 142 connected to a valve port 11 is provided in the valve housing assembly, and a first gap 143 between the mounting base 24 and the inner wall of the movable passage 142 is larger than a second gap 144 between the valve needle 23 and the inner wall of the movable passage 142.

[0098] In some embodiments, the movable passage 142 is formed in the valve body 14, and the mounting base 24 is positioned on the valve body 14. A first gap 143 is formed between the mounting base 24 and the inner wall of the movable passage 142 to facilitate the movement of the mounting base 24 and the valve needle 23 in the movable passage 142, and a second gap 144 is formed between the valve needle 23 and the inner wall of the movable passage 142. The valve needle 23 can move through the movable passage 142 to the valve port 11 to selectively open or close the valve port 11.

[0099] Furthermore, the second gap 144 is smaller than the first gap 143 to ensure that the guide passage can guide the valve needle 23 further, allowing the guide passage to guide and restrict the valve needle 23 further, improving the restricting effect of the movable passage 142 on the valve needle 23, while the smaller gap between the valve needle 23 and the movable passage 142 prevents the valve needle 23 from swinging around in the movable passage 142, thereby ensuring a cooperative effect between the valve needle 23 and the valve port 11.

[0100] In some embodiments of this application, the movable passage 142 includes a connected first passage and a second passage, the cross-sectional area of ​​the first passage being larger than that of the second passage, the mounting base 24 sliding in cooperation with the first passage, and the valve needle 23 sliding in cooperation with the second passage.

[0101] In some embodiments, to facilitate the assembly of the valve needle 23 and mounting base 24 toward the valve port 11 from the side away from the valve port 11, the cross-sectional area of ​​the first passage is larger than the cross-sectional area of ​​the second passage, and after the electronic expansion valve 100 is assembled, the mounting base 24 slides in cooperation with the first passage, a first gap 143 is formed between the mounting base 24 and the first passage, the valve needle 23 slides in cooperation with the second passage, a second gap 144 is formed between the valve needle 23 and the second passage, and the size of the first gap 143 is larger than the size of the second gap 144.

[0102] In some embodiments, the radial dimension on one side of the first gap 143 may be configured to be 0.05 mm, and the radial dimension on one side of the second gap 144 may be configured to be 0.025 mm. When the electronic expansion valve 100 is open, the fluid flows through the connecting passage from the valve port 11 to the second passage, and the size of the second gap 144 is less than the size of the first gap 143. This reduces the pressure of the fluid flowing to the electronic expansion valve 100, thereby ensuring the normal operation of the electronic expansion valve 100.

[0103] Referring to Figures 6 and 9, in some embodiments of the present application, the outer diameter of the mounting base 24 and the alignment portion of the first passage is D1, the length of the mounting base 24 extending into the first passage is L1, the ratio of the length L1 to the outer diameter D1 is the first aspect ratio, and during the movement of the valve needle assembly 20, the first aspect ratio falls within the following range, namely 0.8 to 1.4.

[0104] In some embodiments, while the spring sleeve moves in the first passage, the length L1 of the spring sleeve extending into the first passage varies, and by setting the first aspect ratio from 0.8 to 1.4, the axial dimension of the spring sleeve can be reasonably set according to the outer diameter D1 of the spring sleeve so as to prevent excessive eccentricity between the valve needle assembly 20 and the valve port 11 caused by a small axial dimension of the spring sleeve, thereby ensuring a matching effect between the valve needle assembly 20 and the valve port 11.

[0105] Referring to Figures 6 and 11, in some embodiments of the present application, the outer diameter of the matching portion 234 of the valve needle 23 that slides in cooperation with the second passage is D2, the length of the portion of the matching portion 234 that extends into the second passage is L2, the ratio of the length L2 to the outer diameter D2 is the second aspect ratio, and during the movement of the valve needle assembly 20, the ratio of the second aspect ratio falls within the following range, namely from 0.4 to 1.6.

[0106] In some embodiments, while the valve needle 23 moves in the second passage, the length of a portion of the matching portion 234 extending into the second passage varies, and the axial dimension of the matching portion 234 can be reasonably designed according to the outer diameter D2 of the valve needle 23 so as to prevent excessive eccentricity between the valve needle 23 and the valve port 11 caused by a small axial dimension of the matching portion 234, thereby ensuring a cooperative effect between the valve needle assembly 20 and the valve port 11.

[0107] Referring to Figures 1 and 2, in some embodiments of the present application, the valve port 11 includes a first portion 111 and a second portion 112, the first portion 111 being located on the side of the second portion 112 that is close to the valve needle 23, the cross-sectional area of ​​the first portion 111 gradually decreasing and the cross-sectional area of ​​the second portion 112 gradually increasing in the direction away from the valve needle 23, and the outer wall surface of the valve needle 23 contacts the first portion 111 when the valve needle 23 fully closes the valve port 11.

[0108] In some embodiments, as shown in Figure 2, a first portion 111 is located at one end of the valve port 11 adjacent to the valve stem 21, and a second portion 112 is located at the other end of the valve port 11 away from the valve stem 21, with the first portion 111 connected to the second portion 112, the cross-sectional area of ​​the valve port 11 being minimized at the point where the first portion 111 and the second portion 112 are connected, the volume of the valve needle 23 inserted into the valve port 11 is controlled to control the opening and closing of the electronic expansion valve 100 and the degree of opening of the electronic expansion valve 100, when the electronic expansion valve 100 completely closes the valve port 11, the volume of the valve needle 23 inserted into the valve port 11 is maximized, the outer wall of the valve needle 23 contacts the first portion 111 to achieve a sealing fit, thereby closing the electronic expansion valve 100 and preventing fluid from flowing into the electronic expansion valve 100.

[0109] Referring to Figures 1 to 3, the valve needle 23 is driven to move away from the valve port 11 in order to release the sealing fit between the valve needle 23 and the first portion 111, thereby opening the electronic expansion valve 100, and the fluid flows through the second portion 112 toward the first portion 111, and as the fluid flows toward the first portion 111, the cross-sectional area of ​​the second portion 112 gradually decreases, thereby preventing the fluid pressure flowing toward the electronic expansion valve 100 from becoming excessively high.

[0110] Furthermore, the valve needle 23 is driven to gradually move away from the valve port 11 so as to gradually reduce the volume of the valve needle 23 inserted into the valve port 11, and as it moves away from the second portion 112, the cross-sectional area of ​​the first portion 111 gradually increases, thereby causing the electronic expansion valve 100 to gradually open wider, and thus the opening of the electronic expansion valve 100 is controlled by controlling the area of ​​the valve needle 23 inserted into the valve port 11.

[0111] Referring to Figures 1 and 4, in some embodiments of the present application, the valve needle 23 includes a body portion 231, a transition section 232, and a guide portion 233 arranged in order toward the valve port 11, wherein the body portion 231 cooperates with an elastic member 22, the cross-sectional area of ​​the transition section 232 and the cross-sectional area of ​​the guide portion 233 are progressively reduced toward the valve port 11, and the transition section 232 abuts against a first portion 111.

[0112] In some embodiments, the main body portion 231 is fixedly connected to the inner ring of the bearing 26, the main body portion 231 is in contact with the elastic member 22 through the bearing 26, the end of the main body portion 231 facing away from the elastic member 22 is fixedly connected to the matching portion 234, the transition section 232 is connected to the end of the matching portion 234 adjacent to the valve port 11, the cross-sectional area of ​​the transition section 232 gradually decreases along the direction extending from the first portion 111 to the second portion 112 of the valve port 11, the circumferential sidewall of the transition section 232 can be in contact with the first portion 111 to seal the valve port 11, thereby achieving full closure of the valve port 11.

[0113] Furthermore, the guide portion 233 is connected to the end of the transition section 232 adjacent to the second portion 112, and the cross-sectional area of ​​the guide portion 233 gradually decreases along the direction from the first portion 111 to the second portion 112 of the valve port 11, so that when the valve stem 21 drives the valve needle 23 toward the valve port 11, the guide portion 233 can serve to guide the valve needle 23 toward the valve port 11 to facilitate insertion of the valve needle 23 into the valve port 11, and at the same time, the guide portion 233 can also serve to obstruct the flow in order to reduce the fluid pressure flowing into the electronic expansion valve 100.

[0114] As shown in Figure 4, in some embodiments of the present application, the matching portion 234 is provided with a snap-fitting boss 2341, which is located radially outward from the matching portion 234, and which extends radially from the matching portion 234 toward away from the matching portion 234 to form a boss structure, and which is in contact with the inner ring of the bearing 26 in the axial direction to prevent the valve needle 23 from moving toward the mounting base 24 when exposed to fluid pressure, thereby ensuring the sealing effect of the valve needle 23 toward the valve port 11.

[0115] The thermal management system 1000 of this application includes an electronic expansion valve 100. The thermal management system 1000 is provided with the above-mentioned electronic expansion valve 100, and the rotor assembly is connected in cooperation with the valve needle assembly 20 to ensure that the valve needle assembly 20 can reciprocate and selectively open and close the valve port 11. An elastic member 22 is provided between the valve stem 21 and the valve needle 23, and the elastic member 22 may be configured to provide a pre-tightening force, and the electronic expansion valve 100 is configured to satisfy the following relationship, namely, the number of pulse steps P performed by the rotor assembly is equal to the product of a and the number of valve opening pulses E of the electronic expansion valve 100, where a is greater than 12.5 and less than 20, in order to ensure the cooperation reliability of the valve needle 23 and the valve port 11, and at the same time, the valve opening performance of the electronic expansion valve 100 can be guaranteed, thereby improving the control accuracy of the electronic expansion valve 100, and thereby improving the control effect of the thermal management system 1000.

[0116] In the vehicle 10000 of the present application, as shown in FIG. 15, a thermal management system 1000 is included. The thermal management system 1000 is provided with an electronic expansion valve 100. In order to ensure that the valve needle assembly 20 reciprocates and can selectively open and close the valve port 11, the rotor assembly is connected in cooperation with the valve needle assembly 20. The elastic member 22 may be configured to provide a preload gravity. The electronic expansion valve 100 satisfies the following relationship, that is, the number of pulse steps P executed by the rotor assembly is equal to the product of a and the valve opening pulse number E of the electronic expansion valve 100, where a is greater than 12.5 and less than 20, that is, P = a × E and 12.5 < a < 20, so as to ensure the reliability of the cooperation between the valve needle 23 and the valve port 11 and avoid leakage. At the same time, the electronic expansion valve 100 can ensure the valve opening performance of the electronic expansion valve 100, improve the control accuracy of the electronic expansion valve 100, thereby improving the control effect of the thermal management system 1000 and the thermal management effect of the thermal management system 1000 on the vehicle 10000, and thereby improving the user experience.

[0117] In the description of this specification, the description referring to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in relation to the embodiments or examples are included in at least some embodiments or examples of the present application. In this specification, the schematic expressions of the above terms do not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be preferably combined in any one or more embodiments or examples.

[0118] While embodiments of this application have been shown and described, various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of this application, and the scope of this application is defined by the claims and their equivalents. [Explanation of Symbols]

[0119] 100 Electronic expansion valve 11 valve ports 111 Part 1 112 Part 2 12 Containment Cavities 13 valve seats 131 Fluid flow path 14 Valve body 141 Connection channel 142 Movable passage 143 The first gap 144 The second gap 15 valve housing 20 Valve needle assembly 21 Valve stem 211 Restriction-aligned portion 22 Elastic members 23 valve needle 231 Main body part 232 Transition Section 233 Guide section 234 Consistent part 2341 Tightening boss 24 Mounting base 241 Nut Placement Sheet 25 Bushing 26 bearings 30 Stator assembly 31 Stator bracket 41 Rotor body 42 Guide member 43 Connecting plate 50 Conversion Assembly 51 Conversion member 52 Rotating member 521 Contact part 53 Matching spring 61 First limiting member 62 Second limiting member 63 Fixed step 631 First end face 1000 Thermal Management Systems 10,000 vehicles

Claims

1. It is an electronic expansion valve, A valve housing assembly having a valve port (11) and a housing cavity (12), wherein the valve port (11) is in communication with the housing cavity (12), The valve needle assembly (20) is arranged in a reciprocating manner within the housing cavity (12), and the valve needle assembly (20) comprises a valve stem (21), an elastic member (22), and a valve needle (23), the elastic member (22) being positioned between the first end of the valve stem (21) and the valve needle (23), and the valve stem (21) moving to drive the valve needle (23) to move to open or close the valve port (11), A stator assembly (30) and a rotor assembly, wherein the stator assembly (30) is disposed in the valve housing assembly, the rotor assembly is disposed in the housing cavity (12), the stator assembly (30) and the rotor assembly cooperate to ensure that the rotor assembly is rotatable, and the rotor assembly cooperates with the valve needle assembly (20) to drive the valve needle assembly (20) to reciprocate, An electronic expansion valve is defined in which a valve needle (23) is used to switch the valve port (11) from a fully open state to a fully closed state, the number of pulse steps performed by the rotor assembly is P, the valve needle (23) switches the valve port (11) from a contact state to a fully closed state, the rotor assembly performs a number of over-close steps to compress the elastic member (22), the number of over-close steps is defined as the number of valve opening pulses E of the electronic expansion valve, and the electronic expansion valve satisfies the following relationship, namely p = a × E and 12.5 < a < 20.

2. The electronic expansion valve according to claim 1, wherein the range of the value of a is from greater than 15 to less than 18.

3. The electronic expansion valve according to claim 1 or 2, further comprising a conversion assembly (50), wherein the conversion assembly (50) is disposed within the housing cavity (12), the conversion assembly (50) is screw-connected to the valve stem (21) to ensure that the valve stem (21) is rotatable and movable relative to the conversion assembly (50), and the rotor assembly is positioned on the valve stem (21) to rotate the valve rotor assembly (21).

4. The electronic expansion valve according to claim 3, wherein the conversion assembly (50) cooperates with the rotor assembly to limit the rotational speed of the rotor assembly.

5. The conversion assembly (50) comprises a conversion member (51) and a rotating member (52), the conversion member (51) is screw-connected to the valve stem (21), and a limiting assembly is provided on the outer circumference of the conversion member (51). The rotating member (52) is rotatably and movably arranged on the outer circumference of the conversion member (51), and the rotating member (52) cooperates with the limiting assembly to suppress the displacement of the rotating member (52), The electronic expansion valve according to claim 4, wherein the rotor assembly comprises a rotor body (41) and a guide member (42), the rotor body (41) is located outside the conversion assembly (50), the guide member (42) is fixed to the rotor body (41), a portion of the guide member (42) extends along the direction of movement of the valve stem (21), and the guide member (42) contacts the rotating member (52) in order to drive the rotating member (52) to rotate.

6. The electronic expansion valve according to claim 5, wherein the guide member (42) is fixed to the valve stem (21), and the free end of the valve stem (21) extends beyond the guide member (42).

7. The electronic expansion valve according to claim 5 or 6, wherein the peripheral wall of the conversion member (51) is integrally provided with a helical groove, and the rotating member (52) is externally mounted on the conversion member (51) and cooperates with the helical groove.

8. The electronic expansion valve according to claim 7, wherein the guide member (42) is spaced radially away from the helical groove from the conversion member (51).

9. The electronic expansion valve according to claim 5 or 6, wherein the peripheral wall of the conversion member (51) is fixed to the alignment spring (53), a helical groove is defined between the alignment spring (53) and the peripheral wall of the conversion member (51), and the rotating member (52) is externally mounted on the conversion member (51) and cooperates with the helical groove.

10. The electronic expansion valve according to claim 9, wherein a fixed step (63) is provided on the conversion member (51), the fixed step (63) is provided on the end of the conversion member (51) that is close to the valve port (11), one end of the matching spring (53) is hooked onto a first end face of the fixed step (63) that faces the valve port (11), and at least a portion of the first end face is constructed as an inclined surface that extends toward the valve port (11) away from the matching spring (53).

11. The portion of the rotating member (52) that contacts the guide member (42) is a contact portion (521), and the distance between the end face of the contact portion (521) on the opposite side of the central axis of the conversion member (50) and the central axis is greater than the distance between the outer wall of the drive member (42) and the central axis, according to any one of claims 5 to 10.

12. The electronic expansion valve according to any one of claims 1 to 11, wherein the valve needle assembly (20) further comprises a mounting base (24), the valve stem (21) cooperates with the mounting base (24), the elastic member (22) is disposed within the mounting base (24), one end of the elastic member (22) abuts against the valve stem (21), the other end of the elastic member (22) abuts against the mounting base (24), and the valve needle (23) is disposed within the mounting base (24).

13. The electronic expansion valve according to claim 12, wherein a first gap (143) is located between the mounting base (24) and the inner wall of the valve housing assembly, and a balance hole is located in the mounting base (24), the balance hole connecting to the internal space of the mounting base (24) and the first gap (143).

14. The electronic expansion valve according to claim 13, wherein a second gap (144) is located between the valve needle (23) and the inner wall of the valve housing assembly, and the first gap (143) is larger than the second gap (144).

15. The electronic expansion valve according to any one of claims 1 to 14, wherein the valve port (11) comprises a first portion (111) and a second portion (112), the first portion (111) is located on the side of the second portion (112) that is close to the valve needle (23), the cross-sectional area of ​​the first portion (111) gradually decreases and the cross-sectional area of ​​the second portion (112) gradually increases in the direction away from the valve needle (23), and when the valve needle (23) fully closes the valve port (11), the outer wall surface of the valve needle (23) contacts the first portion (111).

16. A thermal management system comprising an electronic expansion valve according to any one of claims 1 to 15.

17. A vehicle comprising the thermal management system described in claim 16.

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