Electronic expansion valve

Abstract

This application provides an electronic expansion valve, including a rotor assembly, a wear-resistant component, a sleeve assembly, and a valve needle assembly. The rotor assembly is located inside the sleeve assembly and is rotatable relative to the sleeve assembly. The rotor assembly has a first receiving cavity, and a portion of the valve needle assembly is located in the first receiving cavity. The valve needle assembly is connected to the rotor assembly, and the rotor assembly can drive the valve needle assembly to move axially. The electronic expansion valve has a second receiving cavity. Along the axial direction of the electronic expansion valve, the wear-resistant component is axially limited between the rotor assembly and the sleeve assembly, and there is a gap between the rotor assembly and the sleeve assembly. The second receiving cavity is located within the axial height range of the wear-resistant component. The electronic expansion valve has an upper stop state, in which a portion of the valve needle assembly is located in the second receiving cavity, thereby improving the reliability of the electronic expansion valve.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, specifically to an electronic expansion valve that can be used in vehicle, energy storage thermal management system, refrigeration system, and air conditioning system. Background Technology

[0002] Electronic expansion valves are widely used in thermal management systems for regulating fluid flow. In related technologies, based on miniaturization, the rotor assembly abuts against other components such as the valve seat and sleeve assembly, and the rotor assembly rotates relative to these components. Since most of the rotor assembly is made of engineering plastics or magnetic materials, while the valve seat and sleeve assembly are mostly made of metal, the structural design causes the metal materials to abut against and rotate relative to the engineering plastics or magnetic materials. Prolonged friction leads to wear of the rotor assembly. Due to their material properties, engineering plastics or magnetic materials easily generate debris after wear. This debris falls into the interior of the electronic expansion valve, causing internal components to jam and reducing the valve's reliability. Summary of the Invention

[0003] This application provides an electronic expansion valve designed to improve the reliability of electronic expansion valves.

[0004] This application provides an electronic expansion valve, including a rotor assembly, a wear-resistant component, a sleeve assembly, and a valve needle assembly. At least a portion of the rotor assembly is located inside the sleeve assembly, and the rotor assembly is rotatable relative to the sleeve assembly. The rotor assembly has a first receiving cavity, and a portion of the valve needle assembly is located in the first receiving cavity. The valve needle assembly is connected to the rotor assembly, and the rotor assembly is capable of driving the valve needle assembly to move axially. The electronic expansion valve has a second receiving cavity. Along the axial direction of the electronic expansion valve, the wear-resistant component is axially limited between the rotor assembly and the sleeve assembly, and there is a gap between the rotor assembly and the sleeve assembly. The second receiving cavity is located within the axial height range of the wear-resistant component. The electronic expansion valve has an upper stop state, in which a portion of the valve needle assembly is located in the second receiving cavity.

[0005] With this configuration, in the upper stop state, part of the valve needle assembly is located in the second receiving cavity along the axial direction of the electronic expansion valve: there is a gap between the rotor assembly and the sleeve assembly, and the wear-resistant part is axially limited between the rotor assembly and the sleeve assembly. The wear-resistant part is used to isolate the friction between the rotor assembly and the sleeve assembly, reduce the wear of the rotor assembly, reduce the debris generated by the rotor assembly due to wear, reduce the risk of parts jamming due to debris, and improve the reliability of the electronic expansion valve. Attached Figure Description

[0006] Figure 1 This is a schematic cross-sectional view of the electronic expansion valve in one embodiment;

[0007] Figure 2 for Figure 1A cross-sectional schematic diagram of the electronic expansion valve in its stopped state;

[0008] Figure 3 for Figure 1 A cross-sectional schematic diagram of the lower stop state of the electronic expansion valve;

[0009] Figure 4 for Figure 1 Schematic diagram of a centering head;

[0010] Figure 5 for Figure 1 Overall schematic diagram of the central rotor nut;

[0011] Figure 6 for Figure 1 Top view of the rotor nut;

[0012] Figure 7 for Figure 1 Schematic diagram of the middle valve needle assembly;

[0013] Figure 8 for Figure 1 Diagram of stopping the rotation;

[0014] Figure 9 for Figure 1 Schematic diagram of the middle valve seat;

[0015] Figure 10 This is a schematic diagram showing the connection of the rotor nut, magnetic ring, sleeve end cap, and wear-resistant roller in another embodiment.

[0016] Figure 11 This is a schematic diagram showing the connection of the rotor nut, magnetic ring, cover, and wear-resistant lubricating pad in yet another embodiment;

[0017] 001-Centering head, 002-Sleeve, 003-Mounting sleeve, 004-Valve seat, 005-Wear-resistant bearing, 006-Valve needle, 007-Spring, 008-Anti-rotation ring, 009-Screw, 010-Rotor nut, 011-Magnetic ring, 012-Wear-resistant part, 0121-Second receiving cavity, 013-First receiving cavity, 0041-Slot, 0042-Ring protrusion, 0043-Lower limit part, 019-Upper stop end, 0081-Protruding pin, 0082-First protrusion, 083-Second protrusion, 0093-Second convex arm, 0092-Third convex arm, 0011-Protrusion Output shaft, 0101-Snap-on arm, 0102-Stop hole, 0103-Support platform, 0061-Pass end, 0062-Support arm, 0063-First convex arm, 0064-Tip part, 0065-Recessed part, 0066-Fourth convex arm, 31-Sleeve end cap, 111-Support shaft, 1000-Wear-resistant roller, 1001-Ball, 1002-Fixed shaft, 1103-Cap, 1104-Wear-resistant lubricating pad, 11011-Support shaft, 11012-Cylinder part, 1-Rotor assembly, 2-Valve needle assembly, 3-Sleeve assembly, 0104-First end, 0105-Second end. Detailed Implementation

[0018] To facilitate understanding of the purpose, concept, and overall technical solution of this invention, the following specific embodiments are listed to further explain the invention.

[0019] This application provides an electronic expansion valve, including a rotor assembly 1, a wear-resistant component 012, a sleeve assembly 3, and a valve needle assembly 2. The rotor assembly 1 is at least partially located inside the sleeve assembly 3, and the rotor assembly 1 is rotatable relative to the sleeve assembly 3. The rotor assembly 1 has a first receiving cavity 013, and the valve needle assembly 2 is partially located in the first receiving cavity 013. The valve needle assembly 2 is connected to the rotor assembly 1, and the rotor assembly 1 can drive the valve needle assembly 2 to move axially. The electronic expansion valve has a second receiving cavity 0121. Along the axial direction of the electronic expansion valve, the wear-resistant component 012 is axially limited between the rotor assembly 1 and the sleeve assembly 3, and there is a gap between the rotor assembly 1 and the sleeve assembly 3. The second receiving cavity 0121 is located within the axial height range of the wear-resistant component 012. The electronic expansion valve has an upper stop state, in which part of the valve needle assembly 2 is located in the second receiving cavity 0121. With this configuration, the wear-resistant part 012 is axially confined between the rotor assembly 1 and the sleeve assembly 3 along the axial direction of the electronic expansion valve. This reduces the friction generated by the rotor assembly 1 contacting the sleeve assembly 3, reduces the wear debris of the rotor assembly 1, and reduces the possibility of the valve needle assembly and rotor assembly getting stuck due to debris, thereby improving the reliability of the electronic expansion valve.

[0020] In a specific embodiment, such as Figures 1-9As shown, the sleeve assembly 3 has a top wall portion 0012; along the axial direction of the electronic expansion valve: the wear-resistant part 012 is axially limited between the rotor assembly 1 and the top wall portion 0012, and there is a gap between the rotor assembly 1 and the top wall portion 0012; the wear-resistant part 012 has a second receiving cavity 0121 inside, and the electronic expansion valve also has a lower stop state; the valve needle assembly 2 has a top 0091, which abuts against the top wall portion 0012 in the upper stop state; and is located in the first receiving cavity 013 in the lower stop state. The wear-resistant part 012 includes a deep groove ball bearing, which is interference-fitted with the rotor assembly 1. A portion of the radial outer wall of the deep groove ball bearing is fitted inside the rotor assembly 1, the second receiving cavity 0121 is located in the hollow section of the deep groove ball bearing, and a portion of the inner wall of the deep groove ball bearing and its end away from the rotor assembly 1 abut against the top wall portion 0012. Wear-resistant component 012 is configured to include a deep groove ball bearing, which has low frictional force relative to the centering head 001 during rotation, resulting in less wear.

[0021] The sleeve assembly 3 includes a centering head 001, a top wall portion 0012 located within the centering head 001, and a protruding shaft 0011 protruding from the top wall portion 0012 toward the wear-resistant component 012. A portion of the protruding shaft 0011 is positioned within a second receiving cavity 0121. The protruding shaft 0011 has an upper stop end 019, and in the upper stop state, the top portion 0091 abuts against the upper stop end 019. This arrangement, with a portion of the protruding shaft 0011 positioned within the second receiving cavity 0121, improves the coaxiality of the centering head 001 and the wear-resistant component 012, thereby improving the coaxiality of the electronic expansion valve and increasing transmission efficiency. Meanwhile, the upper stop end 019 is used to achieve the upper stop of the axial movement of the valve needle assembly 2. The first receiving cavity 013 and the second receiving cavity 0121 serve as part of the stroke space for the axial movement of the top 0091, saving the space occupied by the additional stop structure. The axial length of the electronic expansion valve is reduced. When applied to the thermal management system, it can effectively reduce the space occupied by the electronic expansion valve, save application space, and facilitate the miniaturization of the application module.

[0022] The sleeve assembly 3 also includes a sleeve 002 and a mounting sleeve 003. The sleeve 002 is fitted onto the outside of the rotor assembly 1. The first axial end of the sleeve 002 is connected to the centering head 001, and the second axial end of the sleeve 002 is connected to the mounting sleeve 003. The mounting sleeve 003 is fitted onto the outside of the valve seat 004. The sleeve 002 and mounting sleeve 003 are used to fix the electronic expansion valve, further improving the coaxiality of the components while reducing the impact of substances in the working environment on the electronic expansion valve, thus further improving the reliability of the electronic expansion valve.

[0023] The rotor assembly 1 includes a rotor nut 010 and a magnetic ring 011. A first receiving cavity 013 is located inside the rotor nut 010. The rotor nut 010 has five support platforms 0103, which are located on the end of the rotor nut 010 facing the deep groove ball bearing. The deep groove ball bearing abuts axially against the support platform 0103. The magnetic ring 011 is sleeved on the outside of the rotor nut 010. The rotor nut 010 has five locking arms 0101, which are connected to the support platforms 0103. The locking arms 0101 are located radially outside the support platforms 0103 and engage with the magnetic ring 011. A portion of the radially outer wall of the wear-resistant part 012 abuts against the locking arms 0101. This configuration axially limits the rotor nut 010 and the magnetic ring 011, reducing axial movement of the rotor nut 010 relative to the magnetic ring 011, reducing wear inside the rotor assembly 1, and further improving the stability of the electronic expansion valve. In addition, the number of latching arms 0101 is set according to actual needs. While ensuring the strength of rotor nut 010, the weight of rotor nut 010 is further reduced to reduce the weight of electronic expansion valve.

[0024] The rotor nut 010 has a first end 0104 and a second end 0105 axially. The first end 0104 is located on the end of the rotor nut 010 near the deep groove ball bearing, and the second end 0105 is located on the end of the rotor nut 010 near the valve seat 004. The wear-resistant bearing 005 is fixedly sleeved on the second end 0105 of the rotor nut 010. The wear-resistant bearing 005 is axially confined between the valve seat 004 and the rotor assembly 1. The wear-resistant bearing 005 is interference-fitted with the valve seat 004 and the rotor nut 010.

[0025] The snap-fit ​​arm 0101 engages with the magnetic ring 011 and is fixedly sleeved on the second end 0105 with the wear-resistant bearing 005. The wear-resistant bearing 005 is axially limited between the valve seat 004 and the rotor assembly 1, serving to axially limit the rotor nut 010, preventing axial movement of the rotor assembly 1, and simultaneously limiting the relative axial movement between the magnetic ring 011 inside the rotor assembly 1 and the rotor nut 010, thus improving the operational stability of the electronic expansion valve. The wear-resistant bearing 005 is connected to the valve seat 004, preventing contact between the rotor assembly 1 and the valve seat 004, reducing friction between them, improving transmission efficiency, and simultaneously utilizing the wear-resistant bearing 005 in conjunction with the deep groove ball bearing to axially limit the rotor nut 010. This results in higher component utilization, saving on additional limiting components or mechanisms, and simplifying the structure of the electronic expansion valve. The interference fit between the wear-resistant bearing 005 and the valve seat 004 reduces axial sliding of the wear-resistant bearing 005 relative to the valve seat 004 during rotor nut 010 movement, increasing the reliability of the fit between components. In this way, the wear-resistant bearing 005, together with the deep groove ball bearing, axially limits the rotor nut 010, further improving the rotational stability of the rotor nut 010. While improving the stability of the electronic expansion valve, it can also achieve the coaxiality of components such as the rotor nut 010, wear-resistant bearing 005, deep groove ball bearing, and valve seat 004, thereby improving the transmission efficiency of the electronic expansion valve.

[0026] In some embodiments, the rotor nut 010 and the magnetic ring 011 can be integrally injection molded, or they can be assembled by interference fit. The rotor nut 010 can be made of lightweight engineering plastics, such as polyphenylene sulfide, polyoxymethylene, etc.

[0027] The first end 0104 of the rotor nut 010 has a stop hole 0102. The top 0091 of the valve needle assembly 2 moves axially along the electronic expansion valve. The top 0091 passes through the stop hole 0102 and enters the second receiving cavity 0121, and abuts against the protruding shaft 0011 of the centering head 001 to achieve upper stop.

[0028] The valve needle assembly 2 includes a lead screw 009, an anti-rotation ring 008, and a valve needle 006. A top 0091 is located at the top of the lead screw 009. The inner wall of the first receiving cavity 013 has a first thread, and the outer circumference of the lead screw 009 is provided with a second thread, with the first thread engaging with the second thread. The bottom end of the lead screw 009 is axially connected to the top end of the anti-rotation ring 008, and the anti-rotation ring 008 is axially connected to the valve needle 006. The anti-rotation ring 008 is provided with a protruding pin 0081, which is circumferentially limited and connected to the valve seat 004. This configuration isolates the kinetic energy of the lead screw 009 and the valve needle 006 rotating along their axes, allowing the valve needle 006 to move approximately along its axis, reducing the risk of the valve needle 006 jamming and further improving the reliability of the electronic expansion valve.

[0029] In this application, the bottom end of the lead screw 009 is defined relative to the top end. The top end is the end closer to the top wall 0012, and the bottom end is the end away from the top wall 0012 and closer to the valve needle 6. That is, the bottom end is approximately the end relatively closer to the valve port along the axial direction. The top end of the anti-rotation ring 008 can also be approximately the end relatively closer to the top wall 0012.

[0030] The valve seat 004 has a groove 0041, and the protruding pin 0081 is at least partially located in the groove 0041. The anti-rotation ring 008 has a first protrusion 0082 and a second protrusion 0083 inside. The valve needle 006 has a first protruding arm 0063, and the first protrusion 0082 is axially connected to the first protruding arm 0063. The lead screw 009 has a second protruding arm 0093 and a third protruding arm 0092, and an annular groove 0094 is formed between the second protruding arm 0093 and the third protruding arm 0092. The second protrusion 0083 is at least partially located in the annular groove 0094. The valve needle 006 has a support arm 0062, and a pre-compression spring 007 is provided between the first protrusion 0082 and the support arm 0062. This arrangement enables the transmission of kinetic energy between the lead screw 009, the anti-rotation ring 008, and the valve needle 006 approximately along the axial direction, reducing the rotational energy of the valve needle 006 and the anti-rotation ring 008. Furthermore, the screw 009, anti-rotation ring 008, and valve needle 006 have relatively simple structures that are easy to process, reducing the processing difficulty of the electronic expansion valve.

[0031] In one embodiment, the slot 0041 can be configured as a protruding structure, while the protruding pin 0081 can be configured as a grooved structure. The protruding structure and the grooved structure cooperate to reduce the rotation of the anti-rotation ring 008. The pre-compressed spring 007 applies an axial pressure to the valve needle 006, further increasing the valve closing accuracy and improving the adjustment accuracy of the electronic expansion valve.

[0032] Specifically, such as Figure 3As shown, the electronic expansion valve has a valve port 0044, and the valve seat 004 has an annular protrusion 0042 protruding towards the axis of the valve port 0044; the valve needle 006 has a tip 0064, a recess 0065, and a fourth protruding arm 0066. The recess 0065 is recessed towards the axis of the electronic expansion valve and is located between the tip 0064 and the fourth protruding arm 0066. The valve needle 006 has a closing end 0061, which is the end of the support arm 0062 near the lead screw 009. The closing end 0061 and the first protrusion 0082 inside the anti-rotation ring 008 have a gap, the width of which is d. Similarly, the bottom of the slot 0041 has a lower limit part 0043. In the lower stop state, the protruding pin 0081 abuts against the lower limit part 0043. In the lower stop state, the fourth convex arm 0066 presses against the annular protrusion 0042, with the annular protrusion 0042 at least partially located in the recess 0065, and the tip 0064 partially positioned within the valve port 0044. This configuration, with the annular protrusion 0042 and the recess 0065 structurally enhancing the effectiveness of the lower stop state, thereby improving the effectiveness of valve closure.

[0033] In another specific embodiment, such as Figure 10 As shown, the wear-resistant component 012 includes a wear-resistant roller 1000, which includes balls 1001 and a fixed shaft 1002. The fixed shaft 1002 abuts against the rotor assembly 1. The balls 1001 are axially limited between the fixed shaft 1002 and the top wall portion 0012. The second receiving cavity 0121 is located within the axial height range of the fixed shaft 1002 and the balls 1001 along the electronic expansion valve. Thus, the fit between the wear-resistant component 012 and the rotor assembly 1 of the electronic expansion valve is more flexible, allowing the wear-resistant component 012 to be designed according to the internal structure of the electronic expansion valve, such as setting the number and size of the balls 1001 and the dimensions and material of the fixed shaft 1002.

[0034] The first end 0104 is located at one end of the rotor nut 010 near the wear-resistant roller 1000. The rotor nut is provided with at least one support platform 0103, and the wear-resistant roller 1000 abuts against the support platform 0103. The magnetic ring is fixedly sleeved on the outside of the rotor nut 11; the first end 0104 is located at the rotor nut as shown in the image. Figure 10 As shown on the upper side, the upper side of the rotor nut has at least one snap-fit ​​arm 0101, which is connected to the support platform 0103. The support platform 0103 and the snap-fit ​​arm 0101 are arranged sequentially along the axis of the rotor nut 010 towards its outer edge. The snap-fit ​​arm 0101 is engaged with the magnetic ring 011. The support platform 0103 is provided with several support shafts 111. This arrangement can effectively reduce the material weight of the rotor nut and further reduce the weight of the electronic expansion valve.

[0035] In the upper stop state, the top 0091 of the lead screw 009 moves axially along the electronic expansion valve, and the top 0091 abuts against the fixed sleeve end cap 31. Based on this, equivalently, in one embodiment, according to the stroke requirements of the lead screw 009's axial movement, the fixed shaft 1002 can also be configured as a non-hollow structure, with the second receiving cavity 0121 located between the inner wall threads of the fixed shaft 1002 and the rotor nut. In the upper stop state, the top 0091 of the lead screw 009 abuts against the fixed shaft 1002, specifically adjusted according to the performance requirements of the electronic expansion valve. On the other hand, the sleeve end cap 31 can also adopt the structure of a centering end cap 001, with the protruding shaft 0011 of the centering end cap 001 at least partially engaged in the hollow portion of the fixed shaft 1002.

[0036] Specifically, in yet another embodiment, such as Figure 11 As shown, the wear-resistant component 012 includes a wear-resistant lubricating pad 1104. A portion of the second receiving cavity 0121 is located within the axial cavity of the wear-resistant lubricating pad 1104. The sleeve assembly 3 includes a cover 1103. One axial end of the wear-resistant lubricating pad 1104 is connected to the cover 1103, and the other axial end of the wear-resistant lubricating pad 1104 is connected to the rotor assembly 1. The wear-resistant lubricating pad 1104 includes a polytetrafluoroethylene (PTFE) gasket material. The rotor assembly 1 includes a rotor nut and a magnetic ring. The rotor nut has several support shafts 11011, which axially abut against the wear-resistant lubricating pad 1104. The wear-resistant lubricating pad 1104 axially abuts against the cover 1103. With this configuration, the electronic expansion valve has a relatively simpler structure. The wear-resistant lubricating pad 1104 and the support shaft 11011 are made of plastic, which can be one or more of polyphenylene sulfide, polyacetal, polytetrafluoroethylene, etc. The materials have good compatibility, such as similar polarity, hardness, and corrosion resistance. The simple structure reduces the wear between the rotor nut of the electronic expansion valve and the wear-resistant lubricating pad 1104, and improves the reliability of the electronic expansion valve.

[0037] Specifically, the wear-resistant lubricating pad 1104 is fixedly connected to the cover 1103, and the support shaft 11011 can rotate relative to the wear-resistant lubricating pad 1104. Alternatively, the wear-resistant lubricating pad 1104 is fixedly connected to the support shaft 11011, and the wear-resistant lubricating pad 1104 can rotate relative to the cover 1103. In this embodiment, the other structures of the electronic expansion valve are largely the same as in the aforementioned embodiments, such as the rotor nut having a cylindrical portion 11012, which is similar in structure to that in the aforementioned embodiments. Alternatively, the cover 1103 can adopt a structure similar to that of the centering head 001, such as having a protruding shaft 0011, with a portion of the protruding shaft 0011 disposed in the second receiving cavity 0121, which can increase the coaxiality of the cover 1103, the wear-resistant lubricating pad 1104, and the rotor nut, thereby improving the transmission efficiency.

[0038] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An electronic expansion valve, characterized in that: The assembly includes a rotor assembly (1), a wear-resistant part (012), a sleeve assembly (3), and a valve needle assembly (2). At least a portion of the rotor assembly (1) is located inside the sleeve assembly (3), and the rotor assembly (1) is rotatable relative to the sleeve assembly (3). The rotor assembly (1) has a first receiving cavity (013), and the valve needle assembly (2) is partially located in the first receiving cavity (013). The valve needle assembly (2) is connected to the rotor assembly (1), and the rotor assembly (1) is capable of driving the valve needle assembly (2) to move axially. The electronic expansion valve has a second receiving cavity (0121); along the axial direction of the electronic expansion valve: the wear-resistant part (012) is axially limited between the rotor assembly (1) and the sleeve assembly (3), there is a gap between the rotor assembly (1) and the sleeve assembly (3), and the second receiving cavity (0121) is located within the axial height range of the wear-resistant part (012); the electronic expansion valve has an upper stop state, in which a portion of the valve needle assembly (2) is located in the second receiving cavity (0121).

2. The electronic expansion valve according to claim 1, characterized in that: The sleeve assembly (3) has a top wall portion (0012); along the axial direction of the electronic expansion valve: the wear-resistant part (012) is axially limited between the rotor assembly (1) and the top wall portion (0012), and there is a gap between the rotor assembly (1) and the top wall portion (0012); the wear-resistant part (012) has a second receiving cavity (0121) inside, and the valve needle assembly (2) has a top (0091); in the upper stop state, the top (0091) abuts against the top wall portion (0012); the electronic expansion valve also has a lower stop state, in which the top (0091) is located in the first receiving cavity (013).

3. The electronic expansion valve according to claim 2, characterized in that: The sleeve assembly (3) includes a centering head (001), the top wall portion (0012) is located on the centering head (001), the centering head (001) has a protruding shaft (0011), the protruding shaft (0011) protrudes toward the wear-resistant part (012) relative to the top wall portion (0012); a portion of the protruding shaft (0011) is placed in the second receiving cavity (0121); the protruding shaft (0011) has an upper stop end (019), in the upper stop state, the top (0091) abuts against the upper stop end (019).

4. The electronic expansion valve according to claim 1, 2, or 3, characterized in that: The rotor assembly (1) includes a rotor nut (010), the first receiving cavity (013) is located inside the rotor nut (010), the rotor nut (010) has at least one support platform (0103), the support platform (0103) is located on one end of the rotor assembly (1) facing the wear-resistant member (012), and the wear-resistant member (012) abuts axially with the support platform (0103).

5. The electronic expansion valve according to claim 4, characterized in that: The rotor assembly (1) includes a magnetic ring (011) which is sleeved on the rotor nut (010); the rotor nut (010) has at least one snap-fit ​​arm (0101) which is connected to the support platform (0103) and is located on the radial outer side of the support platform (0103). The snap-fit ​​arm (0101) engages with the magnetic ring (011), and a portion of the radial outer wall of the wear-resistant part (012) abuts against the snap-fit ​​arm (0101).

6. The electronic expansion valve according to claim 2, 3, or 5, characterized in that: The wear-resistant component (012) includes a deep groove ball bearing, which is interference-fitted with the rotor assembly (1). A portion of the radial outer wall of the deep groove ball bearing is fitted inside the rotor assembly (1). The deep groove ball bearing has a second receiving cavity (0121). A portion of the inner wall of the deep groove ball bearing abuts against the top wall portion (0012). One end of the deep groove ball bearing away from the rotor assembly (1) abuts against the top wall portion (0012). Alternatively, the wear-resistant component (012) includes a wear-resistant roller (1000), which includes balls (1001) and a fixed shaft (1002). The fixed shaft (1002) abuts against the rotor assembly (1). 001) The axial limit is located between the fixed shaft (1002) and the top wall portion (0012), and the second receiving cavity (0121) is located within the height range of the fixed shaft (1002) and the ball (1001) along the axial direction of the electronic expansion valve; or, the wear-resistant part (012) includes a wear-resistant lubricating pad (1104), a portion of the second receiving cavity (0121) is located in the axial cavity of the wear-resistant lubricating pad (1104), one axial end of the wear-resistant lubricating pad (1104) abuts against the top wall portion (0012), and the other axial end of the wear-resistant lubricating pad (1104) abuts against the rotor assembly (1), and the wear-resistant lubricating pad (1104) includes polytetrafluoroethylene gasket material.

7. The electronic expansion valve according to claim 6, characterized in that: The electronic expansion valve further includes a valve seat (004) and a wear-resistant bearing (005). The rotor assembly (1) has an axial first end (0104) and a second end (0105). The second end (0105) is close to the valve seat (004) relative to the first end (0104). The wear-resistant bearing (005) is fixedly sleeved on the second end (0105). The wear-resistant bearing (005) is axially limited between the valve seat (004) and the rotor assembly (1). The wear-resistant bearing (005) is interference-fitted with the valve seat (004) and the rotor assembly (1).

8. The electronic expansion valve according to claim 2 or 3, characterized in that: The valve needle assembly (2) includes a lead screw (009), the top (0091) is located at the top end of the lead screw (009); the inner wall corresponding to the first receiving cavity (013) has a first thread, and the outer periphery of the lead screw (009) is provided with a second thread, the first thread and the second thread meshing; The valve needle assembly (2) includes an anti-rotation ring (008) and a valve needle (006). The bottom end of the lead screw (009) is axially connected to the top end of the anti-rotation ring (008), and the anti-rotation ring (008) is axially connected to the valve needle (006). The anti-rotation ring (008) is provided with a protruding pin (0081), and the protruding pin (0081) is circumferentially limited and connected to the valve seat (004).

9. The electronic expansion valve according to claim 8, characterized in that: The valve seat (004) has a groove (0041), and at least a portion of the protruding pin (0081) is located in the groove (0041); the bottom of the groove (0041) has a lower limiting portion (0043), and in the lower stop state, the protruding pin (0081) abuts against the lower limiting portion (0043); the anti-rotation ring (008) has a first protrusion (0082) and a second protrusion (0083) inside; the valve needle (006) has a first protruding arm (0063), and the first protrusion (0082)... The first convex arm (0063) is axially driven; the lead screw (009) has a second convex arm (0093) and a third convex arm (0092), an annular groove (0094) is provided between the second convex arm (0093) and the third convex arm (0092), and the second protrusion (0083) is at least partially located in the annular groove (0094); the valve needle (006) has a support arm (0062), and a pre-compression spring (007) is provided between the first protrusion (0082) and the support arm (0062).

10. The electronic expansion valve according to any one of claims 7-9, characterized in that: The electronic expansion valve further includes a valve port (0044), and the valve seat (004) has an annular protrusion (0042) protruding toward the axis of the valve port (0044); the valve needle (006) has a tip (0064), a recess (0065), and a fourth convex arm (0066), the recess (0065) being recessed toward the axis of the electronic expansion valve, and the recess (0065) being located between the tip (0064) and the fourth convex arm (0066); in the lower stop state, the annular protrusion (0042) is at least partially located in the recess (0065), and a portion of the tip (0064) is located in the valve port (0044); The sleeve assembly (3) includes a sleeve (002) and an mounting sleeve (003). The sleeve (002) is sleeved on the outside of the rotor assembly (1). The first axial end of the sleeve (002) is connected to the centering head (001), and the second axial end of the sleeve (002) is connected to the mounting sleeve (003). The mounting sleeve (003) is sleeved on the outside of the valve seat (004).

Images