Electronic expansion valve

Abstract

The invention provides an electronic expansion valve, and relates to the technical field of expansion valves. According to the electronic expansion valve, the rotor assembly and the valve needle are arranged, the rotor assembly rotates to enable the valve needle to move in the first direction, in the whole process, the magnetic ring and the rotating shaft of the rotor assembly are only responsible for rotation and the positions of the magnetic ring and the rotating shaft in the first direction are not changed, the valve needle only moves up and down, and the stability and reliability of the electronic expansion valve are improved; meanwhile, based on the characteristic that the rotor assembly only rotates, when the position detection piece detects the position of the valve needle, the overlapping size of the induction rotor assembly and the position detection piece at any position is kept unchanged, the operation position of the valve needle can be accurately fed back in real time, and the induction capacity of the position detection piece is ensured.

Description

Technical Field

[0001] This invention relates to the field of expansion valve technology, and more specifically, to an electronic expansion valve. Background Technology

[0002] Electronic expansion valves are commonly used in thermal management systems to control the flow or size of refrigerant. Related technologies typically involve an electronic expansion valve containing a rotor, a valve needle, and a Hall effect sensor housed within a casing. One end of the rotor is connected to the valve needle, and the rotor moves up and down in tandem with the valve needle's opening and closing. This results in a non-fixed detection position between the sensing element and the object being detected, causing variations in their relative position and overlap length.

[0003] For example, when the valve needle opens to a certain extent, the overlap between the detection element and the sensor reaches its longest point; conversely, when the valve needle is fully closed, the overlap is shortest because the rotor is positioned lower and the Hall sensor remains stationary. This movement can cause false alarms from the valve. Consequently, the electronic expansion valve is prone to step loss during actual operation, resulting in inaccurate position control and ultimately preventing the overall cooling effect of the system from meeting expectations. Summary of the Invention

[0004] The present invention aims to provide an electronic expansion valve that improves the stability and reliability of the electronic expansion valve, accurately reflects the operating position of the valve needle, and has higher space utilization, a compact structure, and lower cost.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides an electronic expansion valve, comprising: a sleeve having a mounting cavity; A rotor assembly, comprising a magnetic ring and a rotating shaft connected together, wherein the position of the magnetic ring remains unchanged in a first direction, and the rotating shaft and the magnetic ring are rotatably disposed within the mounting cavity; A valve needle is connected to one end of the rotating shaft. The valve needle is movable along the first direction, and the rotating shaft rotates to make the valve needle move along the first direction.

[0006] In an optional embodiment, the electronic expansion valve further includes a valve body, the valve body including a housing and a connecting seat connected along the first direction, the sleeve being located inside the housing and connected to the connecting seat to form the mounting cavity; the valve needle is fitted inside the connecting seat, and the rotor assembly is rotatably mounted on the connecting seat.

[0007] In an optional embodiment, the rotor assembly further includes a connecting block and a limiting block, one end of the connecting block being fixedly connected to the first end of the rotating shaft, and the other end being fixedly connected to the inner wall of the magnetic ring. The limiting block is located in the mounting cavity and is fixedly connected to the connecting seat. The limiting block is located inside the magnetic ring. The connecting block and the connecting seat are located at opposite ends of the limiting block. The rotating shaft passes through the limiting block and is fitted with a bearing. The rotating shaft is rotatably connected to the limiting block through the bearing.

[0008] In an optional embodiment, the bearing includes an outer ring and an inner ring, both of which are fitted onto the rotating shaft. The rotating shaft is provided with a second boss and an inner pressure ring is also fitted onto the rotating shaft. One end of the inner ring abuts against the second boss, and the other end abuts against the inner pressure ring. The limiting block is provided with a first assembly groove and a second assembly groove. The second assembly groove is located on the end face of the limiting block. The rotating shaft passes through the first assembly groove and the second assembly groove. The bearing is limited and set in the first assembly groove. An outer retaining ring is provided in the second assembly groove. One end of the outer ring abuts against the inner wall of the first assembly groove, and the other end abuts against the outer retaining ring.

[0009] In an optional embodiment, a nut block is threadedly connected to the second end of the rotating shaft, and a third assembly groove is provided at the end of the limiting block near the valve needle, with the nut block disposed in the third assembly groove; The valve needle is limited to the nut block, and the rotating shaft rotates so that the nut block drives the valve needle to move along the first direction; The valve needle has an assembly cavity at one end near the nut block. The second end of the rotating shaft passes through the nut block and the assembly cavity. An elastic element is provided in the assembly cavity. One end of the elastic element abuts against the bottom wall of the nut block, and the other end abuts against the inner wall of the valve needle.

[0010] In an optional embodiment, the electronic expansion valve includes a position detection element, the housing is provided with a limiting groove relative to the magnetic ring, a first pad is positioned above the limiting groove, and the position detection element is located in the limiting groove and connected to the first pad. The first pad is used to fix the position detection component, and the thickness of the first pad is also used to control the height difference between the position detection component and the magnetic ring, so as to control the overlapping distance of the position detection component and the magnetic ring.

[0011] In an optional embodiment, the position detection element is disposed on the radially outer side of the housing, and the position detection element at least partially overlaps with the magnetic ring in the first direction.

[0012] In an optional embodiment, the electronic expansion valve further includes a mounting portion and a control plate, the mounting portion being disposed on the housing, and the control plate being limited within the mounting portion; The mounting section is provided with a connecting section, the connecting section is provided with the limiting groove, the control plate and the position detection component are respectively provided at opposite ends of the first pad, and the first pad is inserted into the connecting section.

[0013] In an optional embodiment, each end of the first pad is provided with a plug-in post. One end of the first pad is plugged into the connecting part through the plug-in post, and the other end of the first pad is also plugged into the control board through the plug-in post. The first pad is also provided with a plug-in hole, through which the pin of the position detection component passes and is plugged into the control board.

[0014] In an optional embodiment, a second pad is provided between the housing and the connecting seat. The thickness of the second pad is used to control the height difference between the position detection element and the magnetic ring, so as to control the overlapping distance of the position detection element and the magnetic ring.

[0015] The beneficial effects of the electronic expansion valve provided in this embodiment of the invention include: By configuring a rotor assembly and a valve needle, the rotation of the rotor assembly can cause the valve needle to move in the first direction. Throughout the process, the magnetic ring and shaft of the rotor assembly are only responsible for rotation and their positions in the first direction remain unchanged, while the valve needle only moves up and down, which improves the stability and reliability of the electronic expansion valve. At the same time, based on the characteristic that the rotor assembly only rotates, this application ensures that when the position detection element detects the position of the valve needle, the overlap size between the sensing rotor assembly and the position detection element remains unchanged at any position, which can accurately feed back the operating position of the valve needle in real time and ensure the sensing capability of the position detection element. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the electronic expansion valve provided in this embodiment; Figure 2 This is a cross-sectional view of the electronic expansion valve provided in this embodiment from a first-view perspective; Figure 3 This is a partial cross-sectional view showing the connection between the position detection component and the connecting part provided in this embodiment; Figure 4 This is a schematic diagram of the internal structure of the connecting part of the housing provided in this embodiment; Figure 5 This is a schematic diagram showing the interconnection of the position detection component, the first pad, and the control component provided in this embodiment. Figure 6 This is a schematic diagram of the structure of the first pad provided in this embodiment; Figure 7 This is a cross-sectional view of the electronic expansion valve provided in this embodiment from a second perspective; Figure 8 This is a partial cross-sectional view of the rotor assembly provided in this embodiment.

[0018] Icons: 010-Electronic expansion valve; 100-Valve body; 110-Housing; 111-Mounting part; 120-Connecting seat; 130-Valve needle seat; 131-Flow channel hole; 140-Connecting part; 141-Limiting groove; 142-Slot; 150-Top cover; 160-Third boss; 170-Second pad; 200-Rotor assembly; 210-Magnetic ring; 220-Connecting block; 230-Shaft; 231-First boss; 232-Second boss; 233-Threaded end; 240-Limiting block; 241-Third assembly groove; 250-Bearing; 251-Outer ring; 252-Inner ring; 253-Inner pressure ring; 254-Outer retaining ring; 300 - Valve needle; 310 - Nut block; 320 - Elastic element; 330 - Mounting base; 400 - Position detection component; 410 - Pin; 500 - Control board; 600 - First pad; 610 - Insertion post; 620 - Insertion hole; 700 - Coil; 800 - Sleeve; 810 - Tube. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] The following describes in detail the overall structure, working principle, and technical effects of the electronic expansion valve 010 provided by the present invention through embodiments and in conjunction with the accompanying drawings.

[0026] Please refer to Figure 1 The electronic expansion valve 010 provided by this invention can be applied in thermal management systems in fields such as new energy vehicles, process cooling air conditioners and refrigeration equipment, and can precisely adjust the flow rate of refrigerant.

[0027] Please refer to Figure 1 The present invention provides an electronic expansion valve 010, comprising: Sleeve 800, sleeve 800 has an installation cavity; Rotor assembly 200 includes a magnetic ring 210 and a rotating shaft 230 connected to each other. The position of the magnetic ring 210 remains unchanged in the first direction, and the rotating shaft 230 and the magnetic ring 210 are rotatably disposed in the mounting cavity. The valve needle 300 is connected to one end of the rotating shaft 230. The valve needle 300 is movable in a first direction. The rotating shaft 230 rotates to make the valve needle 300 move in the first direction.

[0028] It is understandable that by setting up the rotor assembly 200 and the valve needle 300, the rotation of the rotor assembly 200 can cause the valve needle 300 to move in the first direction. During the entire process, the magnetic ring 210 and the rotating shaft 230 of the rotor assembly 200 are only responsible for rotation and their positions in the first direction remain unchanged, while the valve needle 300 only moves up and down, which improves the stability and reliability of the electronic expansion valve 010. At the same time, based on the characteristic that the rotor assembly 200 only rotates, this application ensures that when the position detection element 400 detects the position of the valve needle 300, the overlap size between the sensing rotor assembly 200 and the position detection element 400 remains unchanged at any position, which can accurately feed back the operating position of the valve needle 300 in real time and ensure the sensing capability of the position detection element 400.

[0029] In this embodiment, the first direction is the height direction of the electronic expansion valve 010, and moving along the first direction can be understood as moving up and down along the height direction of the electronic expansion valve 010.

[0030] In this embodiment, please refer to Figure 2 and Figure 7 The electronic expansion valve 010 also includes a valve body 100, which includes a housing 110 and a connecting seat 120 connected along a first direction. A sleeve 800 is located inside the housing 110 and connected to the connecting seat 120 to form an installation cavity. A valve needle 300 is fitted inside the connecting seat 120, and a rotor assembly 200 is rotatably mounted on the connecting seat 120.

[0031] Specifically, please refer to Figure 7 The housing 110 also contains a coil 700, which surrounds the outer layer of the rotor assembly 200. The coil 700 and the housing 110 are assembled together by injection molding; that is, two sets of upper limit frames are respectively set on the housing 110, the coil 700 is formed by winding wire on the frame, and finally the coil 700 and the housing 110 are assembled together by connectors, upper and lower claws and other components, and then injection molding is used to form an integral structure.

[0032] In this embodiment, please refer to Figures 7-8 The rotor assembly 200 includes a magnetic ring 210, a connecting block 220, and a rotating shaft 230. The rotating shaft 230 is rotatably mounted on the connecting seat 120. The rotating shaft 230 and the connecting block 220 are located inside the magnetic ring 210. One end of the connecting block 220 is fixedly connected to the first end of the rotating shaft 230, and the other end is limitedly connected to the inner wall of the magnetic ring 210. The second end of the rotating shaft 230 is drive-connected to the valve needle 300.

[0033] The connecting block 220 is a metal part, and the magnetic ring 210 is a magnetic injection molded part. The connecting block 220 and the magnetic ring 210 are integrally injection molded.

[0034] Please refer to Figure 8The first end of the rotating shaft 230 is provided with a first protrusion 231. The rotating shaft 230 passes through the connecting block 220 from bottom to top along the first direction so that the bottom wall of the connecting block 220 abuts against the top wall of the first protrusion 231. The fixed connection between the rotating shaft 230 and the connecting block 220 can be achieved by welding or limiting connection.

[0035] In this embodiment, please refer to Figures 7-8 The rotor assembly 200 also includes a limiting block 240, which is located in the mounting cavity and fixedly connected to the connecting seat 120. The limiting block 240 is located inside the magnetic ring 210, and the connecting block 220 and the connecting seat 120 are located at opposite ends of the limiting block 240. The rotating shaft 230 passes through the limiting block 240, and a bearing 250 is sleeved on the rotating shaft 230. The rotating shaft 230 is rotatably connected to the limiting block 240 through the bearing 250.

[0036] In this embodiment, please refer to Figure 8 The bearing 250 includes an outer ring 251 and an inner ring 252. Both the inner ring 252 and the outer ring 251 are fitted onto the rotating shaft 230. The rotating shaft 230 is provided with a second boss 232 and an inner pressure ring 253 is also fitted onto the rotating shaft 230. One end of the inner ring 252 abuts against the second boss 232, and the other end abuts against the inner pressure ring 253.

[0037] Specifically, please refer to Figure 8 The rotating shaft 230 is provided with a second boss 232. The rotating shaft 230 passes through the bearing 250 from bottom to top along the first direction so that the bottom wall of the inner ring 252 of the bearing 250 abuts against the top wall of the second boss 232. The fixed connection between the rotating shaft 230 and the inner ring 252 of the rotating shaft 230 can be achieved by welding or limiting connection.

[0038] Specifically, the limiting block 240 is provided with a first assembly groove and a second assembly groove. The second assembly groove is located on the end face of the limiting block 240. The rotating shaft 230 passes through the first assembly groove and the second assembly groove. The bearing 250 is limited and set in the first assembly groove. The second assembly groove is provided with an outer retaining ring 254. One end of the outer ring 251 abuts against the inner wall of the first assembly groove, and the other end abuts against the outer retaining ring 254.

[0039] Understandably, by setting the inner pressure ring 253, the inner ring 252 of the bearing 250 can be fixed to the second boss 232 of the rotating shaft 230; by setting the outer retaining ring 254, the outer ring 251 of the bearing 250 can be fixedly connected to the limiting block 240. This ensures that the rotating shaft 230 is fixedly and rotatably connected to the connecting seat 120 through the limiting block 240, the bearing 250, the inner pressure ring 253, and the outer retaining ring 254, allowing the rotor assembly 200 to rotate while maintaining its position in the first direction. In other words, the rotor assembly 200 rotates to move the valve needle 300 in the first direction. This configuration of the rotating shaft 230 and bearing 250 ensures smooth rotation of the rotating shaft 230 while keeping it fixed.

[0040] In this embodiment, please refer to Figure 7 The second end of the rotating shaft 230 is threadedly connected to a nut block 310. The end of the limiting block 240 near the connecting seat 120 is provided with a third assembly groove 241. The third assembly groove 241 is used to assemble the nut block 310, and the nut block 310 is located in the third assembly groove 241.

[0041] Specifically, the valve needle 300 is limitedly connected to the nut block 310, and the rotating shaft 230 rotates so that the nut block 310 drives the valve needle 300 to move in the first direction; the valve needle 300 is provided with an assembly cavity at one end near the nut block 310, and the second end of the rotating shaft 230 passes through the nut block 310 and the assembly cavity. An elastic element 320 is provided in the assembly cavity, one end of the elastic element 320 abuts against the bottom wall of the nut block 310, and the other end abuts against the inner wall of the valve needle 300.

[0042] Optionally, the nut block has a snap-fit ​​groove at one end near the valve needle, and the valve needle has a snap-fit ​​protrusion at one end near the nut block. The snap-fit ​​protrusion of the valve needle snaps into the snap-fit ​​groove of the nut block to achieve a limiting connection between the valve needle 300 and the nut block 310.

[0043] Alternatively, please refer to Figure 8 The second end of the rotating shaft 230 is a threaded end 233. The nut block 310 is provided with a threaded hole. The second end of the rotating shaft 230 passes through the nut block 310. The threaded end 233 is fitted with the threaded hole and threadedly connected.

[0044] Alternatively, please refer to Figure 7 The elastic element 320 can be a spring. The valve needle 300 is provided with a mounting seat 330 in the assembly cavity. One end of the elastic element 320 is sleeved on the mounting seat 330 and abuts against the inner wall of the valve needle 300, while the other end abuts against the bottom wall of the nut block 310.

[0045] It is understandable that the rotor assembly 200 rotates under the action of the coil 700, and the shaft 230 rotates synchronously. Since the fixed nut block 310 and valve needle 300 are confined within the third assembly groove 241, during the rotation of the shaft 230, the nut block 310 will only move up and down along the first direction of the threaded end 233. During this process, the valve needle 300, which is integrated with the nut block 310, realizes the opening and closing process.

[0046] It is worth mentioning that, compared with the rotor and valve needle 300 that move up and down in the prior art, this application can reduce the height of the electronic expansion valve 010 by setting the rotor assembly 200, the limiting block 240, the nut block 310 and the valve needle 300 connected in sequence in the above design, thereby reducing the overall volume of the electronic expansion valve 010.

[0047] In this embodiment, please refer to Figure 7 The rotor assembly 200 also includes a sleeve 810; the sleeve 800 is connected to the connecting seat 120 to form an internal mounting cavity, and the magnetic ring 210, the connecting block 220, the rotating shaft 230 and the connecting block 220 are all disposed in the mounting cavity of the sleeve 800; wherein, the sleeve 810 is located on top of the connecting block 220 and fixed on top of the sleeve 800, and the rotating shaft 230 passes through the sleeve 810 and is rotatably connected to the sleeve 810.

[0048] The sleeve 810 is pressed flat into the top of the sleeve 800 using a tooling, and the sleeve 800 and the sleeve 810 are fixed by interference fit.

[0049] In this embodiment, please refer to Figure 7 The valve body 100 includes a valve needle seat 130, a portion of which is located radially inside the connecting seat 120, and a portion of which extends out of the bottom of the connecting seat 120.

[0050] Specifically, the valve needle seat 130 is provided with a third passage cavity and at least two flow channel holes 131, the at least two flow channel holes 131 are connected to the third passage cavity, and the valve needle 300 passes through the third passage cavity and is limited and connected to the nut block 310.

[0051] Understandably, the rotor assembly 200 rotates to move the valve needle 300 in a first direction; wherein, when the valve needle 300 moves upward in the first direction, the passage between the third passage cavity and at least two flow channel holes 131 is opened, and the electronic expansion valve 010 is opened; when the valve needle 300 moves downward in the first direction, the passage between the third passage cavity and at least two flow channel holes 131 is closed, and the electronic expansion valve 010 is closed.

[0052] In this embodiment, the electronic expansion valve 010 includes a position detection element 400. Please refer to... Figure 2 and Figure 3The housing 110 is provided with a limiting groove 141 relative to the magnetic ring 210. A first pad 600 is positioned at the upper limit of the limiting groove 141. The position detection element 400 is located in the limiting groove 141 and connected to the first pad 600. The first pad 600 is used to fix the position detection element 400. The thickness of the first pad 600 is also used to control the height difference between the position detection element 400 and the magnetic ring 210, so as to control the overlapping distance of the overlapping section between the position detection element 400 and the magnetic ring 210.

[0053] Understandably, by setting the position detection element 400, which is located within the limiting groove 141 and fixed by the first pad 600, even if the connection between the position detection element 400 and the first pad 600 fails when the electronic expansion valve 010 experiences severe shaking, the limiting groove 141 can still limit the position detection element 400, ensuring its reliability and preventing it from failing due to large-scale shaking. Since the position detection element 400, the first pad 600, and the coil 700 are all mounted on the housing 110, and the rotor assembly 200 is also mounted on the housing 110, the height difference between the position detection element 400 and the magnetic ring 210 can be controlled by adjusting the thickness of the first pad 600, thereby controlling the overlap distance between the position detection element 400 and the magnetic ring 210.

[0054] Alternatively, please refer to Figure 7 A second pad 170 is provided between the housing 110 and the connecting seat 120. The thickness of the second pad 170 is used to control the height difference between the position detection element 400 and the magnetic ring 210, so as to control the overlapping distance of the position detection element 400 and the magnetic ring 210.

[0055] The connecting seat 120 is provided with a mating groove for assembling the second pad 170.

[0056] Understandably, by setting the second pad 170, since the position detection element 400, the first pad 600, and the coil 700 are all mounted on the housing 110, and the rotor assembly 200 is mounted on the connecting seat 120, the height of the position detection element 400 and the first pad 600 relative to the rotor assembly 200 can be adjusted by adjusting the thickness of the second pad 170, thereby controlling the height difference between the position detection element 400 and the magnetic ring 210, and thus controlling the overlap distance between the position detection element 400 and the magnetic ring 210.

[0057] It is worth mentioning that the overlap distance between the position detection element 400 and the magnetic ring 210 can be controlled by adjusting the thickness of the first pad 600 and the second pad 170. This ensures that the overlap distance between the position detection element 400 and the magnetic ring 210 in mass-produced electronic expansion valves 010 is a fixed value, resulting in extremely high positional accuracy of the position detection element 400. Specifically, when the position detection element 400 detects the position of the valve needle 300, as long as the overlap dimension between the magnetic ring 210 and the position detection element 400 remains constant at any position, and the overlap length is 1.5mm or more, the sensing capability of the position detection element 400 can be ensured to accurately reflect the operating position of the valve needle 300.

[0058] In this embodiment, the position detection element 400 is disposed on the radially outer side of the housing 110, and the position detection element 400 at least partially overlaps with the magnetic ring 210 in the first direction. Preferably, the position detection element 400 and the magnetic ring 210 completely overlap in the first direction, resulting in better detection performance of the position detection element 400.

[0059] In this embodiment, please refer to Figures 2-6 The electronic expansion valve 010 also includes a mounting part 111 and a control plate 500. The mounting part 111 is disposed on the housing 110, and the control plate 500 is limited and disposed within the mounting part 111; please refer to Figure 4 The mounting part 111 is provided with a connecting part 140, the connecting part 140 is provided with a limiting groove 141, and the control plate 500 and the position detection component 400 are respectively provided at opposite ends of the first pad 600. The first pad 600 is inserted into the connecting part 140.

[0060] Among them, the control board 500 can be a PCB board, and the position detection component 400 can be a Hall sensor.

[0061] The mounting part 111 is an integral structure with the housing 110.

[0062] Specifically, please refer to Figure 3 and Figure 5 In the first direction, the first pad 600 has plug-in pins 610 at both ends. One end of the first pad 600 is plugged into the connecting part 140 through the plug-in pin 610, and the other end of the first pad 600 is also plugged into the control board 500 through the plug-in pin 610. The first pad 600 is also provided with a plug-in hole 620, and the pin 410 of the position detection component 400 passes through the plug-in hole 620 and is plugged into the control board 500.

[0063] Specifically, please refer to Figure 6The mounting part 111 is a protruding structure with a limiting groove 141, and the mounting part 111 has slots 142 on both the left and right sides of the limiting groove 141. One end of the first pad 600 is inserted into the slot 142 of the connecting part 140 through a plug post 610, thereby fixing the position detection component 400, the first pad 600, and the control plate 500 to the valve body 100.

[0064] Alternatively, please refer to Figure 4 The mounting part 111 is provided with a third boss 160. One end of the control plate 500 is fixed to the mounting part 111 by the first pad 600, and the other end is placed on the third boss 160. The height of the third boss 160 is the sum of the height of the connecting part 140 and the thickness of the first pad 600, so as to ensure the stable fixation of the control plate 500.

[0065] Alternatively, please refer to Figure 6 The first pad 600 can be a thin plate with a certain thickness. The thin plate has several circular insertion holes 620 in the middle for the pins 410 of the position detection component 400. Protruding insertion posts 610 are provided on both sides of each circular insertion hole 620. The insertion posts 610 are used for positioning and fixing the position detection component 400, control board 500, and connecting part 140. The shape of the insertion posts 610 includes, but is not limited to, cylinders, rectangular pillars, etc., and the number of insertion posts 610 can be one, two, three, etc.

[0066] It is worth mentioning that the thickness of the first pad 600 can be used to control the distance between the position detection component 400 and the control board 500, while also protecting the pins 410 of the position detection component. However, since the connection between the position detection component 400 and the control board 500 is achieved by soldering the pins 410 of the position detection component 400 to the control board 500, this connection is not very secure. Therefore, when the electronic expansion valve 010 experiences severe shaking, the position of the position detection component 400 may fluctuate significantly, potentially leading to its failure. The limiting groove 141 ensures that the position detection component 400 is limited under extreme conditions, guaranteeing its reliability.

[0067] Alternatively, please refer to Figure 2 The valve body 100 also includes an upper cover 150, which covers the mounting portion 111.

[0068] The manufacturing process and technology of the electronic expansion valve 010 provided in this embodiment of the invention are as follows: 1. Assemble the valve needle seat 130 from the bottom of the connecting seat 120 into the connecting seat 120, and weld a ring around the mating part of the valve needle seat 130 and the connecting seat 120 for fixation. The separate valve needle seat 130 and the connecting seat 120 can simplify the processing and reduce the cost.

[0069] 2. The mounting base 330 and the elastic element 320 are installed in the assembly cavity of the valve needle 300. Then, the nut block 310 is fixedly assembled with the valve needle 300 by pressing it in and rotating it. This eliminates the need for welding.

[0070] 3. Press the bearing 250 into the rotating shaft 230 and make the inner ring 252 of the bearing 250 abut against the second boss 232 of the rotating shaft 230. Weld the bearing 250 and the rotating shaft 230 to form a rotatable rod bearing 250 assembly. Press the assembled bearing 250 and rotating shaft 230 into the first assembly groove of the limiting block 240, press the outer retaining ring 254 into the second assembly groove, and weld the outer retaining ring 254 to the limiting block 240 to fix it.

[0071] 4. Press the sleeve 810 flat into the top of the sleeve 800 using a tooling, and fix the sleeve 800 and sleeve 810 by interference fit. Then, install the integrally injection molded connecting block 220 and magnetic ring 210, as well as the welded and fixed rotating shaft 230, bearing 250 and limiting block 240 into the sleeve 800 in sequence. Then, install the assembled nut block 310 and valve needle 300 into the third assembly groove 241 of the limiting block 240, so that the nut block 310 and the rotating shaft 230 are threaded together. Finally, assemble the assembled connecting seat 120 and valve needle seat 130, mate the valve needle seat 130 with the valve needle 300, mate the connecting seat 120 with the housing 110, and assemble the connecting seat 120 and the housing 110 with the second pad 170.

[0072] 4. Assemble the control board 500, the first pad 600, and the position detection component 400. Weld the pins 410 of the position detection component 400 to the control board 500. Assemble the position detection component 400 into the limiting groove 141 of the connecting part 140. Insert the first pad 600 into the connecting part 140. After the assembly is completed, cover the connecting part 140 with the upper cover 150 and weld it along the connecting surface. The electronic expansion valve 010 is now assembled.

[0073] The overlapping distance between the position detection element 400 and the magnetic ring 210 of the rotor assembly 200 can be controlled by the thickness of the first pad 600 and the second pad 170.

[0074] The working principle and process of the electronic expansion valve 010 provided in this embodiment of the invention are as follows: When the coil 700 is energized, it generates a magnetic field with changing direction, which simultaneously drives the rotor assembly 200 to rotate synchronously. The rotating shaft 230 and the magnetic ring 210 rotate synchronously. Under the action of the bearing 250 on the limiting block 240, the positions of the rotating shaft 230 and the magnetic ring 210 in the first direction remain unchanged. Since the fixed nut block 310 and the valve needle 300 are limited to the third assembly groove 241 of the limiting block 240, during the rotation of the rotating shaft 230, the nut block 310 moves up and down along the first direction of the threaded end 233. During this process, the valve needle 300 connected to the nut block 310 moves up and down synchronously along the first direction, thereby realizing the switching process.

[0075] In summary, the electronic expansion valve 010 provided in this embodiment of the invention, by setting a rotor assembly 200 and a valve needle 300, allows the valve needle 300 to move along a first direction when the rotor assembly 200 rotates. During the entire process, the magnetic ring 210 and the rotating shaft 230 of the rotor assembly 200 only rotate and remain in the same position in the first direction, while the valve needle 300 only moves up and down, thus improving the stability and reliability of the electronic expansion valve 010. At the same time, based on the characteristic that the rotor assembly 200 only rotates, this application ensures that when the position detection element 400 detects the position of the valve needle 300, the overlap size between the sensing rotor assembly 200 and the position detection element 400 remains unchanged at any position, which can accurately and in real time provide feedback on the operating position of the valve needle 300 and ensure the sensing capability of the position detection element 400.

[0076] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An electronic expansion valve, characterized in that, include: A sleeve (800) having a mounting cavity; The rotor assembly (200) includes a magnetic ring (210) and a rotating shaft (230) connected to each other. The magnetic ring (210) remains in a fixed position in a first direction, and the rotating shaft (230) and the magnetic ring (210) are rotatably disposed in the mounting cavity. A valve needle (300) is connected to one end of a rotating shaft (230). The valve needle (300) is movable along the first direction. The rotating shaft (230) rotates to make the valve needle (300) move along the first direction.

2. The electronic expansion valve according to claim 1, characterized in that, The electronic expansion valve (010) further includes a valve body (100), which includes a housing (110) and a connecting seat (120) connected along the first direction. The sleeve (800) is located inside the housing (110) and connected to the connecting seat (120) to form the mounting cavity. The valve needle (300) is fitted inside the connecting seat (120), and the rotor assembly (200) is rotatably mounted on the connecting seat (120).

3. The electronic expansion valve according to claim 2, characterized in that, The rotor assembly (200) further includes a connecting block (220) and a limiting block (240). One end of the connecting block (220) is fixedly connected to the first end of the rotating shaft (230), and the other end is fixedly connected to the inner wall of the magnetic ring (210). The limiting block (240) is located in the mounting cavity and is fixedly connected to the connecting seat (120). The limiting block (240) is located inside the magnetic ring (210). The connecting block (220) and the connecting seat (120) are located at opposite ends of the limiting block (240). The rotating shaft (230) passes through the limiting block (240). A bearing (250) is sleeved on the rotating shaft (230). The rotating shaft (230) is rotatably connected to the limiting block (240) through the bearing (250).

4. The electronic expansion valve according to claim 3, characterized in that, The bearing (250) includes an outer ring (251) and an inner ring (252). Both the inner ring (252) and the outer ring (251) are sleeved on the rotating shaft (230). The rotating shaft (230) is provided with a second boss (232). The rotating shaft (230) is also sleeved with an inner pressure ring (253). One end of the inner ring (252) abuts against the second boss (232), and the other end abuts against the inner pressure ring (253). The limiting block (240) is provided with a first assembly groove and a second assembly groove. The second assembly groove is located on the end face of the limiting block (240). The rotating shaft (230) passes through the first assembly groove and the second assembly groove. The bearing (250) is limited and set in the first assembly groove. The second assembly groove is provided with an outer retaining ring (254). One end of the outer ring (251) abuts against the inner wall of the first assembly groove, and the other end abuts against the outer retaining ring (254).

5. The electronic expansion valve according to claim 3, characterized in that, The second end of the rotating shaft (230) is threadedly connected to a nut block (310), and the end of the limiting block (240) near the valve needle (300) is provided with a third assembly groove (241), and the nut block (310) is disposed in the third assembly groove (241); The valve needle (300) is limitedly connected to the nut block (310), and the rotating shaft (230) rotates so that the nut block (310) drives the valve needle (300) to move along the first direction; The valve needle (300) has an assembly cavity at one end near the nut block (310). The second end of the rotating shaft (230) passes through the nut block (310) and the assembly cavity. An elastic element (320) is provided in the assembly cavity. One end of the elastic element (320) abuts against the bottom wall of the nut block (310), and the other end abuts against the inner wall of the valve needle (300).

6. The electronic expansion valve according to claim 2, characterized in that, The electronic expansion valve (010) includes a position detection element (400). The housing (110) is provided with a limiting groove (141) relative to the magnetic ring (210). A first pad (600) is positioned above the limiting groove (141). The position detection element (400) is located in the limiting groove (141) and connected to the first pad (600). The first pad (600) is used to fix the position detection element (400), and the thickness of the first pad (600) is also used to control the height difference between the position detection element (400) and the magnetic ring (210) to control the overlapping distance of the position detection element (400) and the magnetic ring (210).

7. The electronic expansion valve according to claim 6, characterized in that, The position detection element (400) is disposed on the radial outer side of the housing (110), and the position detection element (400) and the magnetic ring (210) at least partially overlap in the first direction.

8. The electronic expansion valve according to claim 6, characterized in that, The electronic expansion valve (010) also includes a mounting part (111) and a control plate (500). The mounting part (111) is disposed on the housing (110), and the control plate (500) is limitedly disposed within the mounting part (111). The mounting part (111) is provided with a connecting part (140), the connecting part (140) is provided with the limiting groove (141), the control plate (500) and the position detection component (400) are respectively provided at opposite ends of the first pad (600), and the first pad (600) is inserted into the connecting part (140).

9. The electronic expansion valve according to claim 8, characterized in that, The first pad (600) has plug-in pins (610) at both ends. One end of the first pad (600) is plugged into the connecting part (140) through the plug-in pin (610), and the other end of the first pad (600) is also plugged into the control board (500) through the plug-in pin (610). The first pad (600) is also provided with a plug-in hole (620), and the pin (410) of the position detection component (400) passes through the plug-in hole (620) and is plugged into the control board (500).

10. The electronic expansion valve according to claim 6, characterized in that, A second pad (170) is provided between the housing (110) and the connecting seat (120). The thickness of the second pad (170) is used to control the height difference between the position detection element and the magnetic ring (210) so as to control the overlapping distance of the position detection element (400) and the magnetic ring (210).

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