Stop device of electric valve, electric valve and vehicle

Abstract

Disclosed in the present application is a stop device. The stop device comprises a stop guide rail, which has an upper stop portion and a lower stop portion, and a stop seat, which is configured for the mounting of the stop guide rail, wherein the stop seat comprises a mandrel and a stepped portion; a fixing portion is provided at the lower end of the stop guide rail; the stop guide rail surrounds the mandrel by means of torsion; and a limiting engagement groove for limiting the circumferential displacement of the guide rail is provided in the periphery of the stepped portion that surrounds the mandrel. The stop guide rail is tightly fixed by means of the limiting engagement groove structure, such that the stop guide rail is limited in a circumferential direction, thereby preventing a stop ring from driving the stop guide rail to rotate left and right when the stop ring moves along the stop guide rail.

Description

A stop device for an electric valve, an electric valve, and a vehicle

[0001] This application claims priority to Chinese patent applications filed on May 10, 2024, with application number 202421012146.3, and filed on December 19, 2024, with application number 202411897804.6, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of fluid control technology, and in particular to a stop device and an electric valve having the stop device. Background Technology

[0003] In related technologies, electric valves typically include a valve body, a rotor, a screw, a nut sleeve, and a valve needle assembly. The valve body has a receiving cavity and a valve port, with the receiving cavity communicating with the valve port. The rotor, nut sleeve, and valve port are spaced apart. The rotor is movably disposed within the receiving cavity and can rotate around its own axis during movement. The nut sleeve is disposed within the receiving cavity. One end of the screw is fixed to the rotor, and the other end passes through the nut sleeve and is drivenly connected to the valve needle assembly to close or open the valve port. To ensure the stability of the rotor assembly's rotation and movement, a limiting component is typically provided between the nut sleeve and the rotor. This limiting component usually includes a stop guide rail and a stop ring. A limiting spring is sleeved on the outer circumference of the nut sleeve, and the stop ring is movably disposed on the rotor and engages with the stop guide rail for limiting movement. The stop guide rail provides a limiting track for the movement and rotation of the stop ring. Technical issues

[0004] However, the method of fixing the guide rail in the stop device of the related technology is not very effective in limiting the possible rotation of the guide rail. Technical solutions

[0005] In a first aspect, this application provides a stopping device, including a stopping guide rail having upper and lower stopping portions and a stopping seat for mounting the stopping guide rail, characterized in that the stopping seat includes a spindle and a stepped portion, the lower end of the stopping guide rail is provided with a fixing portion, the stopping guide rail is twisted around the spindle, and the stepped portion is provided with a limiting groove around the outer periphery of the spindle to limit the circumferential displacement of the stopping guide rail.

[0006] Secondly, this application provides an electric valve, including a stop device and a valve needle as described above, wherein the stop device is used to control the opening and closing stroke of the valve needle.

[0007] Thirdly, this application discloses a valve core for use in a control valve. The control valve includes a second valve seat having a second valve port. The valve core includes a valve stem comprising a main body portion and an adjusting portion arranged axially. The adjusting portion is configured to at least partially extend into the second valve port, such that the control valve has a closed state and a throttling state.

[0008] The regulating part includes a guide surface and a throttling surface. In the throttling state, the regulating part extends into the second valve seat, the guide surface abuts against the inner wall of the second valve seat, and the throttling surface and the inner wall of the second valve seat enclose a fluid channel for fluid passage. In the closed state, the regulating part blocks the second valve port.

[0009] Fourthly, this application also discloses a control valve, the control valve including a second valve seat and a valve core as described in any of the above claims, wherein the valve core is movably connected to the second valve seat.

[0010] Fifthly, this application also discloses a thermal management system, which includes the valve core or control valve described in any of the preceding claims.

[0011] Sixthly, this application provides a vehicle including the electric valve, valve core, control valve, or thermal management system described above. Beneficial effects

[0012] The electric valve stop device, electric valve, and vehicle provided in this application are configured with a stop seat, a stop guide rail, and a stop ring. A limiting groove is formed on the stepped portion of the lower end of the spindle of the stop seat. The shape of the limiting groove and the fixing part of the stop guide rail are adapted to each other. The stop guide rail is tightly fixed by the groove structure, thereby limiting the circumferential movement of the stop guide rail and preventing the stop ring from causing the stop guide rail to rotate left and right when it moves along the stop guide rail. This strengthens the connection between the stop guide rail and the stop seat and effectively limits the possible rotation of the guide rail. Attached Figure Description

[0013] The following drawings, which illustrate embodiments of this application, are incorporated herein by reference and are used to understand this application. The drawings depict embodiments of this application and their descriptions, serving to explain the principles of this application.

[0014] Figure 1 is a cross-sectional view of the electric valve provided in this application;

[0015] Figure 2 is a schematic diagram of the assembly structure in a specific embodiment provided in this application;

[0016] Figure 3 is a schematic diagram of the assembly structure in a specific embodiment provided in this application;

[0017] Figure 4 is a structural schematic diagram of the stop seat in a specific embodiment provided in this application;

[0018] Figure 5 is a schematic diagram of the limiting slot in a specific embodiment provided in this application;

[0019] Figure 6 is a structural schematic diagram of the stop guide rail in a specific embodiment provided in this application;

[0020] Figure 7 is a schematic diagram of the stop ring in a specific embodiment provided in this application;

[0021] Figure 8 is a schematic diagram of the stop rail in another specific embodiment provided in this application;

[0022] Figure 9 is a schematic diagram of the stop ring in another specific embodiment provided in this application;

[0023] Figure 10 is a structural schematic diagram of a vehicle according to a specific embodiment provided in this application;

[0024] Figure 11 is a schematic diagram of the valve core structure in an embodiment of this application;

[0025] Figure 12 is a front view of the valve core in an embodiment of this application;

[0026] Figure 13 is a schematic diagram of the AA section in Figure 12;

[0027] Figure 14 is a schematic diagram of the structure of the second valve seat in an embodiment of this application;

[0028] Figure 15 is a front view of the second valve seat in an embodiment of this application;

[0029] Figure 16 is a schematic diagram of the BB cross section in Figure 15;

[0030] Figure 17 is a schematic diagram of the control valve in the closed state in an embodiment of this application;

[0031] Figure 18 is a cross-sectional view of the control valve in Figure 17;

[0032] Figure 19 is a top view of the control valve in Figure 17;

[0033] Figure 20 is a schematic diagram of the CC cross section in Figure 19;

[0034] Figure 21 is a schematic diagram of the DD cross section in Figure 19;

[0035] Figure 22 is a schematic diagram of the control valve in the throttling state in an embodiment of this application;

[0036] Figure 23 is a cross-sectional view of the control valve in Figure 22;

[0037] Figure 24 is a top view of the control valve in Figure 22;

[0038] Figure 25 is a schematic diagram of the EE cross-section in Figure 24;

[0039] Figure 26 is a schematic diagram of the FF-section in Figure 24.

[0040] Explanation of reference numerals in the attached figures: 00. Stop device; 1. Stop seat; 11. Spindle; 12. Stepped part; 121. Limiting groove; 1211. Top wall; 1212. Bottom surface; 122. Protrusion; 1221. Arc-shaped surface; 123. First limiting part; 1231. Outer side; 1232. Inner side; 1233. Lower side; 124. Transition surface; 2. Stop guide rail; 21. Upper stop part; 22. Lower stop part; 23. Fixing part; 231. First fixing part; 232. Second fixing part; 3. Stop ring; 31. Upper stop part; 32. Lower stop part; 4. Electric valve; 41. Sleeve; 42. Rotor assembly; 421. Limiting rod; 43. Screw assembly; 44. Valve core assembly; 45. Compression nut; 46. Valve body; 47. Valve needle assembly; 48. First valve seat; 5. Vehicle; 10. Valve core; 100. Valve stem; 110. Main body; 120. Adjustment part; 1210. Guide surface; 1220. Throttling surface; 130. Second limiting part; 1310. First sealing surface; 20. Second valve seat; 210. Second valve port; 220. Valve cavity; 230. Second sealing surface; 30. Sealing element.

[0041] Implementation methods of this application

[0042] The stop device 00 provided in this application is applicable to the electric valve 4 shown in Figure 1. The working principle of the stop device 00 will be explained in conjunction with the overall structure of the electric valve 4.

[0043] The electric valve 4 includes a sleeve 41, a rotor assembly 42, a stop device 00, a screw assembly 43, a valve core assembly 44, a clamping nut 45, a valve body 46, a valve needle assembly 47, and a first valve seat 48.

[0044] A stator is provided on the outside of the sleeve 41, and the stator can generate a rotating magnetic field. The main body of the rotor assembly 42 is made of magnetic material. Under the traction of the rotating magnetic field of the stator, the rotor assembly 42 rotates. The rotor assembly 42 is fixedly connected to the screw assembly 43. When the rotor assembly 42 rotates, it can drive the screw assembly 43 to rotate together. The stop device 00 is fixedly connected to the valve core assembly 44. The rotor assembly 42 is provided with a limit rod 421. The limit rod 421 cooperates with the stop device 00 to limit the number of rotations of the rotor assembly 42. The sleeve 41, valve body 46, and valve core assembly 44 are fixedly connected. The valve core assembly 44 is provided with an upper and lower through hole in the middle, and the through hole is provided with an internal thread in the middle. The screw assembly 43 is partially disposed within the through hole of the valve core assembly 44. The outer circumference of the screw assembly 43 is provided with an external thread, which engages with the internal thread of the valve core, converting the rotational motion of the screw assembly 43 into axial linear motion. The screw assembly 43 and the valve needle assembly 47 are axially limited. When the screw assembly 43 generates axial linear motion, it drives the valve needle assembly 47 to generate the same motion, causing the valve needle assembly 47 to move away from or towards the first valve port located on the first valve seat 48. The clamping nut 4530 is fixedly connected to the body via threads, clamping the expansion valve to the body. When the valve needle assembly 47 moves away from the first valve port located on the first valve seat 48, fluid can enter from the fluid inlet and flow out through the first valve port. As described above, controlling the distance between the valve needle assembly 47 and the first valve port controls the flow rate of the electric valve 4.

[0045] The first aspect of this application is described below. This application provides a stopping device 00, including a stopping guide rail 2 having upper and lower stopping portions 22 and a stopping seat 1 for mounting the stopping guide rail 2. The stopping seat 1 includes a spindle 11 and a stepped portion 12. The lower end of the stopping guide rail 2 is provided with a fixing portion 23. The stopping guide rail 2 is twisted around the spindle 11. The stepped portion 12 is provided with a limiting groove 121 around the outer periphery of the spindle 11 for limiting the circumferential displacement of the stopping guide rail 2.

[0046] It is worth noting that the stepped part 12 has a limiting groove 121 that surrounds the outer periphery of the spindle 11. The shape of the fixing part 23 of the stop guide rail 2 is adapted to the limiting groove 121, and the shape of the stop guide rail 2 is close to "U". The upward bending design at the tail end makes the fixing part 23 of the stop guide rail 2 tightly engaged with the limiting groove 121, and strictly limits the fixing part 23 in both the left and right directions, thereby avoiding the circumferential displacement of the stop guide rail 2 caused by the stop ring 3 during the sliding process when the electric valve 4 is working.

[0047] As can be understood, circumferential direction refers to the circumferential direction of the cross-section of the cylindrical mandrel 11 along the vertical axial direction. During the operation of the electric valve 4, the stop ring 3 rotates along the stop guide rail 2, and there is a certain friction between the two. Therefore, the stop ring 3 will drive the stop guide rail 2 to generate a force along the circumferential direction of the mandrel 11. In layman's terms, the stop ring 3 may drive the stop guide rail 2 to rotate. The design of the limiting groove 121 in this application can tightly fix the stop guide rail 2 in the circumferential direction, preventing it from rotating left or right, that is, preventing it from generating circumferential displacement.

[0048] The stopping device 00 of this application consists of a stopping seat 1, a stopping guide rail 2, and a stop ring 3. A limiting groove 121 is provided on the stepped portion 12 on the lower outer periphery of the spindle 11 of the stopping seat 1. The limiting groove 121 and the fixing portion 23 of the stopping guide rail 2 are matched in shape. The stopping guide rail 2 is tightly fixed by the groove structure, thereby limiting the circumferential movement of the stopping guide rail 2 and preventing the stop ring 3 from causing the stopping guide rail 2 to rotate left and right when it moves along the stopping guide rail 2. This strengthens the connection between the stopping guide rail and the stopping seat.

[0049] Specifically, referring to Figures 2 and 3, in the stop device 00 of this application, the lower end of the stop guide rail 2 is provided with a fixing part 23. After the stop guide rail 2 is twisted in the forward or reverse direction, it can hold the spindle 11 tightly. Then, the lower fixing part 23 is fixedly connected to the limiting groove 121 of the step part 12 at the lower end of the spindle 11, so that the entire stop guide rail 2 is fixedly connected to the spindle 11 in both the axial and circumferential directions.

[0050] Understandably, since the stop guide 2 grips the spindle 11 after being twisted, the inner diameter of the stop guide 2 can be set to be slightly larger or slightly smaller than the outer diameter of the spindle 11 to improve the positioning stability of both. Because the inner diameter of the stop guide 2 is slightly smaller than the outer diameter of the spindle 11, the stop guide 2 needs to be twisted in the opposite direction to increase its inner diameter, allowing it to be smoothly fitted onto the spindle 11. Furthermore, since the inner diameter of the stop guide 2 is smaller than the outer diameter of the spindle 11, when the stop guide 2 is twisted in the opposite direction, there will inevitably be a positive twisting reaction force to recover its deformation. Under the action of this reaction force, the inner diameter of the stop guide 2 tends to contract, thereby gripping the spindle 11 and preventing slippage relative to the spindle 11.

[0051] At the same time, the limiting slot 121 can be set in front of the fixing part 23, and then rotated in the opposite direction of the rotation of the stop guide rail 2 so that the fixing part 23 moves to the position corresponding to the limiting slot 121, and rotates in the direction of the opening of the limiting slot 121 to the bottom wall so as to insert into the limiting slot 121 for locking, thereby realizing the fixed connection between the two.

[0052] Furthermore, the stop guide 2 in this application is typically a spring, with the direction of spring torsion being positive and the direction opposite to the direction of spring torsion being negative. The positive direction refers to the direction from the lower side to the higher side after the spring is cut along the axial center line. The higher side on the left is left-handed and the higher side on the right is right-handed. When the spring is torsioned in the positive direction, the number of helical turns increases, and when the spring is torsioned in the negative direction, the number of helical turns decreases. The direction opposite to the direction of rotation of the stop guide 2 is called negative, and the direction in the direction of rotation of the stop guide 2 is called positive.

[0053] The front and rear directions mentioned in this article refer to the torsion direction of the stop guide rail 2. The direction at the positive front end is the front, and the direction at the positive rear end is the rear. The axial and circumferential directions mentioned in this article refer to the mandrel 11. The extension direction of the mandrel 11 is the axial direction, and the direction in which its outer wall surrounds its axis is the circumferential direction. The up and down directions mentioned in this article refer to the directions parallel to the axis of the mandrel 11. The end of the mandrel 11 connected to the first valve seat 48 is the down, and the other end is the up.

[0054] In one embodiment, the step portion 12 is arranged around the outer periphery of the lower end of the spindle 11, and the upper surface of the step portion 12 is provided with a protrusion 122 extending towards the upper end of the stop seat 1. The protrusion 122 and the limiting groove 121 form a first limiting portion 123.

[0055] Specifically, the stepped portion 12 is located at the lower end of the spindle 11, and its outer diameter is slightly larger than that of the spindle 11, thus forming a step with a certain thickness with the spindle 11, thereby providing a basis for the opening of the limiting groove. The upper surface of the stepped portion 12 is not flat. In order to match the protrusion at the end of the stop guide rail 2, the upper surface of the stepped portion 12 also has an adapted upward convex structure. The surface of the stepped portion 12 and the limiting groove 121 together form a first limiting portion 123 that is close to a square shape.

[0056] In one embodiment, the upper surface of the protrusion 122 is an arc-shaped surface 1221 adapted to the tilt angle of the guide rail. By adjusting the shape of the upper end face of the step portion 12 to adapt to the movement trajectory of the spring guide rail and the stop ring 3, the axial space of the stop seat 1 can be saved, which is conducive to increasing the axial height ratio of the spindle 11 relative to the stop seat 1. The spindle 11 is used to cooperate with the stop guide rail 2. At least part of the stop guide rail 2 is located on the outer periphery of the spindle 11. The increase in the axial height ratio of the spindle 11 relative to the stop seat 1 is conducive to increasing the number of turns of the stop guide rail 2, increasing the angular range that the rotor assembly 42 can rotate, increasing the displacement of the valve core assembly 44, and thus conducive to increasing the flow regulation range of the electric valve 4.

[0057] In one embodiment, the upper surface of the stepped portion 12 is further provided with a recessed arc-shaped transition surface 124, which is connected to the lower bottom surface 1212 of the limiting groove 121. The arc-shaped transition surface 124 can guide the stop guide rail 2 when it is assembled into the limiting groove 121, so that the guide rail fixing portion 23 is automatically guided to the snap-fit ​​position for easy installation and fixing.

[0058] In one embodiment, the first limiting part 123 has an outer side 1231, an inner side 1232, and a lower side 1233. The outer side 1231 fits against the stop guide rail 2, limiting the displacement of the stop guide rail 2 in its direction. The inner side 1232 is connected to the top wall 1211 of the limiting groove 121. The distance from the top wall 1211 to the lower bottom surface 1212 is greater than the distance from the lower side 1233 to the lower bottom surface 1212, which corresponds to the hook structure at the right half of the "U"-shaped fixing part 23 of the stop guide rail 2. The upward hook structure at the end of the stop guide rail 2 limits the circumferential displacement of the stop guide rail 2 during the rotation of the rotor and the stop ring 3, providing a stronger fixing force in the circumferential direction.

[0059] As shown in Figure 7, in one embodiment, the upper stop 21 is an upward right-angle bend and extension portion provided at the upper end of the stop guide rail 2, and the lower stop 22 is a downward right-angle bend and extension portion provided at the lower end of the stop guide rail 2.

[0060] Specifically, the bending structure of the upper and lower stop parts 22 can block the stop ring 3 when it slides to the upper and lower boundaries of the stop guide rail 2, thereby realizing the stopping function.

[0061] Referring to Figure 7, the fixing part 23 consists of multiple rounded bends and their extensions at the lower end of the stop guide rail 2. Specifically, the fixing part 23 includes a first fixing part 231 whose end of the lower stop part 22 bends and extends in the direction parallel to the guide rail, and a second fixing part 232 whose end of the first fixing part 231 bends and extends upward. Both bends are rounded corner structures. Specifically, the fixing part 23 forms a "U"-shaped structure through multiple rounded corner bends. The core seat step part 12 has a limiting groove 121 adapted to its structure. The two are tightly connected to achieve the fixing of the stop guide rail 2.

[0062] The fixing part 23 includes a first fixing part, which is the part of the lower stop part 22 that is bent and extended in the direction of parallel guide rail.

[0063] Referring to Figures 8 and 9, in another embodiment of this application, the fixing part 23 includes a first fixing part 231 that bends and extends from the end of the lower stop part 22 toward the direction parallel to the guide rail. That is, the shape of the fixing part 23 is "L". Correspondingly, the limiting groove 121 is also set as an L-shaped groove that matches it to fix the stop guide rail 2. At the same time, the limiting groove 121 fixes the left and right sides of the guide rail below the lower stop part 22 of the stop guide rail 2, thereby circumferentially limiting the stop guide rail 2 and preventing the stop ring 3 from driving the stop guide rail 2 to rotate left and right when it moves along the stop guide rail 2.

[0064] In one embodiment, the stop device 00 further includes a stop ring 3, which is sleeved on the outer periphery of the valve core and is rotatably disposed in the stop guide rail 2. The upper and lower ends of the stop ring 3 have an upper stop portion 31 and a lower stop portion 32, respectively, and the upper stop portion 31 has an outwardly bent structure.

[0065] Furthermore, the stop ring 3 slides in conjunction with the helical portion of the stop guide rail 2. Specifically, the stop ring 3 is fitted onto the stop guide rail 2, and the stop ring 3 can rotate helically around the stop guide rail 2. The track between the upper stop portion 21 and the lower stop portion 22 of the stop guide rail 2 serves as the sliding track for the stop ring 3. When the rotor assembly 42 rotates, the limiting rod 421 abuts against the stop portion of the stop ring 3, causing the stop ring 3 to rotate along with the rotor assembly 42. Under the action of the spring guide rail, the stop ring 3 rotates while simultaneously moving axially.

[0066] In one embodiment, the diameter of the stop rail 2 is 0.6 mm, and the diameter of the stop ring 3 is 0.8 mm.

[0067] Please refer further to Figures 2 and 3. Figure 2 is a schematic diagram of the assembly structure of the stop device 00 provided by the present invention in the first specific embodiment; Figure 3 is a schematic diagram of the assembly structure of the stop device 00 provided by the present invention in the second specific embodiment. As shown in Figure 2, when the stop ring 3 moves upward to the upper end of the cylindrical part of the core seat, the upper stop portion 31 of the stop ring 3 is blocked by the upper stop portion 21 of the spring stop guide rail 2, thus reaching its upper displacement limit. As shown in Figure 3, when the stop ring 3 moves downward to the lower end of the cylindrical part, the lower stop portion 32 of the stop ring 3 is blocked by the lower stop portion 22 of the spring guide rail, thus reaching its lower displacement limit. When the stop ring 3 reaches the upper displacement limit or the lower displacement limit, its upper stop portion 31 abuts against the limiting rod 421 of the rotor assembly 42, restricting the rotation of the rotor assembly 42, that is, restricting the axial movement of the valve needle assembly 47.

[0068] In one embodiment, as shown in FIGS. 6 and 7, the pitches of the stop ring 3 and the stop guide rail 2 are both evenly arranged. The pitch of the stop ring 3 is L1, and the pitch of the stop guide rail 2 is L2, and 0.2 mm > L2 - L1 > 0.1 mm. It can be understood that the pitch of the stop guide rail 2 is slightly larger than that of the stop ring 3, which can reduce the contact surface between the slip ring and the spring guide rail, thereby reducing the friction between the two during the sliding process.

[0069] Specifically, the limit guide rail is annularly arranged on the outer periphery of the mandrel 11, the stop ring 3 is sleeved on the outer periphery of the mandrel 11, and the stop ring 3 is rotatably arranged in the limit guide rail. The stop ring 3 moves synchronously with the rotor, and the stop ring 3 is used to limit the stroke of the rotor; wherein, the pitch of the stop ring 3 is L1, and the pitch of the limit guide rail is L2. Applying the technical solution of the present application, under the driving action of the rotor, the screw drives the valve needle assembly 47 to close or open the first valve port. When the rotor moves, the stop ring 3 moves with the rotor to limit the stroke of the rotor. During the movement of the stop ring 3, the limit guide rail plays a guiding role in the movement of the stop ring 3. In this solution, the stop ring 3 is also a spiral structure. Therefore, in this solution, the pitch of the limit guide rail and the pitch of the stop ring 3 are designed to be as close as possible to ensure the smooth movement of the stop ring 3, and to ensure the effect of the axis limit of the limit guide rail on the stop ring 3, reducing the phenomenon of the stop ring 3 moving erratically during the movement, and further reducing the noise generated by the collision between the stop ring 3 and the limit guide rail.

[0070] Furthermore, when L2 - L1 < 0.1 mm, there may be a situation where the stop ring 3 and the limit guide rail are worn. After long-term use, the limit guide rail or the stop ring 3 may be deformed, affecting the smooth movement of the stop ring 3 and ultimately affecting the smooth opening or closing of the electronic expansion valve; when 0.2 mm < L2 - L1, the gap between the stop ring 3 and the limit guide rail is too large. During the movement of the stop ring 3, the stop ring 3 may move erratically, causing the stop ring 3 to collide with the limit guide rail, and then there may be a phenomenon of excessive noise during the movement of the stop ring 3, resulting in a poor user experience. Therefore, in this solution, the following numerical range is set, 0.2 mm > L2 - L1 > 0.1 mm, which can not only ensure the smooth movement of the stop ring 3 but also reduce the noise generated by the collision between the stop ring 3 and the limit guide rail.

[0071] In one embodiment, as shown in FIGS. 3 and 4, the upper surface of the convex portion 122 is an arc surface 1221, and the radian structure of the arc surface 1221 is a radian adapted to the stop guide rail 2. The first limiting portion 123 has an outer side surface 1231, an inner side surface 1232 and a lower side surface 1233. The outer side surface 1231 contacts the stop guide rail 2, and the inner side surface 1232 is connected to the top wall 1211 of the limiting groove.

[0072] In one embodiment, as shown in FIG5, the distance from the top wall 1211 to the bottom surface 1212 is h1, and the distance from the bottom side surface 1233 to the bottom surface 1212 is h2, where h1>h2.

[0073] The stopping device 00 of this application is provided with a stopping seat 1, a stopping guide rail 2 and a stop ring 3. A limiting groove 121 is opened on the stepped portion 12 on the lower outer periphery of the spindle 11 of the stopping seat 1. The limiting groove 121 and the fixing portion 23 of the stopping guide rail 2 are adapted to each other. The stopping guide rail 2 is tightly fixed by the groove structure, thereby limiting the stopping guide rail 2 in the circumferential direction and preventing the stop ring 3 from driving the stopping guide rail 2 to rotate left and right when it moves along the stopping guide rail 2.

[0074] Referring to Figure 1, in a second aspect, this application also provides an electric valve 4, including a stop device 00 for controlling the opening and closing stroke of the valve needle. The electric valve 4 includes a sleeve 41, a rotor assembly 42, the stop device 00, a screw assembly 43, a valve core assembly 44, a clamping nut 45, a valve body 46, a valve needle assembly 47, and a first valve seat 48.

[0075] A stator is provided on the outside of the sleeve 41, and the stator can generate a rotating magnetic field. The main body of the rotor assembly 42 is made of magnetic material. Under the traction of the rotating magnetic field of the stator, the rotor assembly 42 rotates. The rotor assembly 42 is fixedly connected to the screw assembly 43. When the rotor assembly 42 rotates, it can drive the screw assembly 43 to rotate together. The stop device 00 is fixedly connected to the valve core assembly 44. The rotor assembly 42 is provided with a limit rod 421. The limit rod 421 cooperates with the stop device 00 to limit the number of rotations of the rotor assembly 42. The sleeve 41, valve body 46, and valve core assembly 44 are fixedly connected. The valve core assembly 44 is provided with an upper and lower through hole in the middle, and the through hole is provided with an internal thread in the middle. The screw assembly 43 is partially disposed within the through hole of the valve core assembly 44. The outer circumference of the screw assembly 43 is provided with an external thread, which engages with the internal thread of the valve core to convert the rotational motion of the screw assembly 43 into axial linear motion. The screw assembly 43 and the valve needle assembly 47 are configured for axial limiting connection. When the screw assembly 43 generates axial linear motion, it can drive the valve needle assembly 47 to generate the same motion, causing the valve needle assembly 47 to move away from or towards the first valve port disposed on the first valve seat 48. The clamping nut 45 is fixedly connected to the body through threads, and the clamping nut 45 presses the expansion valve onto the body. When the valve needle assembly 47 moves away from the first valve port disposed on the first valve seat 48, fluid can enter from the fluid inlet and flow out through the first valve port.

[0076] The electric valve 4 of this application includes the aforementioned stop device 00. A limiting component is provided between the nut sleeve and the rotor. The limiting component typically includes a stop guide rail 2 and a stop ring 3. A limiting spring is sleeved on the outer periphery of the nut sleeve. The stop ring 3 is movably mounted on the rotor and is limited in cooperation with the stop guide rail 2. The stop guide rail 2 provides a limiting track for the movement and rotation of the stop ring 3. The stop device 00 cooperates with the limiting rod 421 to limit the number of rotations of the rotor assembly 42, thereby controlling the distance between the valve needle assembly 47 and the first valve port, thus controlling the flow rate of the electric valve 4.

[0077] Referring to Figure 10, in a third aspect, this application also provides a vehicle 5. The vehicle 5 includes an electric valve 4. The structure of the electric valve 4 can refer to the above embodiments, and is not limited thereto.

[0078] In related technologies, throttle valves can precisely control fluid flow by adjusting the throttling cross-section or throttling length through regulating the gap between the valve core and the second valve seat. Throttling valves have a wide range of applications. For example, in the thermal management system of new energy vehicles, throttle valves can be used in heat pumps to throttle and cut off the flow of the refrigerant throughout the circulation channel. The precise flow regulation function of the entire throttle valve can be achieved by adjusting the height of the valve core relative to the second valve seat.

[0079] In practical applications, throttle valves operate in both closed and throttling modes. In the throttling mode, fluid can flow between the valve core and the second valve seat. In common throttle valves, the portion of the valve core that mates with the second valve seat is often conical. This design results in a small effective flow area for fluid passage. When the fluid velocity through the valve core is high, the high-speed fluid can cause significant scouring, leading to high-frequency vibrations. This not only affects the throttle valve's flow control and reduces its reliability, but prolonged use can also damage the valve core and shorten the valve's lifespan.

[0080] This application provides a valve core 10 to solve the problem of severe vibration in existing throttle valve cores 10 under throttling conditions. Specifically, the valve core 10 provided in this application is applied to a control valve, and the control valve includes a second valve seat 20 having a second valve port 210.

[0081] Referring to Figures 11 to 13, which are structural schematic diagrams of the valve core 10 provided in the embodiments of this application; referring to Figures 14 to 16, which are structural schematic diagrams of the second valve seat 20 provided in the embodiments of this application; and referring to Figures 17 to 26, which are schematic diagrams of the cooperation between the valve core 10 and the second valve seat 20 provided in the embodiments of this application, as shown in Figures 11 to 26, the valve core 10 includes a valve stem 100, which includes a main body portion 110 and an adjusting portion 120 arranged axially. The adjusting portion 120 is used to at least partially extend into the second valve seat 20. The valve port 210 allows the control valve to have a closed state and a throttling state; wherein, the regulating part 120 includes an arc-shaped guide surface 1210 and an inclined throttling surface 1220; in the throttling state, the regulating part 120 extends into the second valve port 210, the guide surface 1210 abuts against the inner wall of the second valve seat 20, and the throttling surface 1220 and the inner wall of the second valve seat 20 enclose to form a fluid channel for fluid passage; in the closed state, the regulating part 120 blocks the second valve port 210, and the fluid channel is closed.

[0082] Specifically, the valve stem 100 is generally cylindrical in shape. The main body 110 is the main structure of the valve stem 100, and the adjusting part 120 serves as the component of the valve core 10 to achieve the throttling function, and is used to cooperate with the second valve seat 20. When the adjusting part 120 is partially inserted into the second valve seat 20, the second valve port 210 of the second valve seat 20 is in the open state, and the control valve is in the throttling state. Alternatively, the adjusting part 120 can be fully inserted into the second valve port 210 to block the second valve port 210. When the adjusting part 120 is fully inserted into the second valve seat 20, the second valve port 210 of the second valve seat 20 is blocked by the valve stem 100, the second valve port 210 of the second valve seat 20 is in the closed state, and the control valve is also in the closed state.

[0083] Along the axial direction of the valve stem 100, towards the end furthest from the main body 110, the size of the adjusting portion 120 decreases. In specific applications, the throttling effect of the control valve can be achieved by changing the position of the valve core 10 relative to the second valve seat 20, that is, by changing the length of the adjusting portion 120 extending into the second valve seat 20. Since the adjusting portion 120 is smaller the further away from the main body 110, the smaller the length of the adjusting portion 120 extending into the second valve seat 20, the greater the flow rate through the fluid passage. When it is necessary to reduce the fluid flow rate, this can be achieved by increasing the length of the adjusting portion 120 extending into the second valve seat 20.

[0084] Optionally, the guide surface and the throttling surface are alternately arranged along the circumference of the adjusting part. For example, in this embodiment, there are two guide surfaces and two throttling surfaces, and they are alternately arranged along the axial direction of the adjusting part. Further, when there are multiple guide surfaces and multiple throttling surfaces, the multiple guide surfaces can be configured with the same structure, and similarly, the multiple throttling surfaces can also be configured with the same structure to form multiple fluid channels with uniform flow, ensuring the uniformity and stability of fluid flow.

[0085] In this embodiment of the application, as shown in FIG11, the throttling surface 1220 is a slanted plane that is angled to the axial direction of the valve stem 100, and the guide surface 1210 is an arc surface that is arranged along the circumference of the valve stem 100. In this way, when at least a portion of the adjusting part 120 extends into the second valve seat 20, the guide surface 1210 of the arc surface arranged along the axial direction of the valve stem 100 can abut against the inner wall of the second valve seat 20, thereby guiding the mutual cooperation between the valve core 10 and the second valve seat 20.

[0086] Specifically, the valve stem 100 has a cylindrical structure, and the throttling surface 1220 is a cross-section formed by obliquely cutting one end of the valve stem 100. The outer peripheral side of the uncut portion of the valve stem 100 forms a guide surface 1210. It is understood that because the valve stem 100 has a cylindrical structure, after oblique cutting, the remaining portion can still maintain a good fit and guiding effect with the inner wall of the second valve seat 20.

[0087] Optionally, there are multiple throttling surfaces 1220, and the included angles between the multiple throttling surfaces 1220 and the axial direction of the valve stem 100 are the same. Each throttling surface 1220 can form a fluid channel with the second valve seat 20. Since the multiple throttling surfaces 1220 have the same included angles with the axial direction of the valve stem 100, the flow rate among the multiple fluid channels formed by the throttling surfaces 1220 is more uniform when the control valve is in a throttling state. This helps to improve the stability of fluid flow in the control valve under throttling conditions.

[0088] Understandably, when the included angle between the multiple throttling surfaces 1220 and the axial direction of the valve stem 100 is the same, that is, the area of ​​the fluid channel formed by the throttling surfaces 1220 and the inner wall of the second valve seat 20 is also the same, when the fluid flows from the main body 110 to the fluid channel, it can be more evenly distributed to the multiple fluid channels, thereby ensuring the stability of the valve core 10 in the throttling state and realizing a stable flow regulation function.

[0089] Optionally, there are multiple throttling surfaces 1220, which are spaced apart circumferentially along the valve stem 100, and the guide surface 1210 is disposed between adjacent throttling surfaces 1220.

[0090] In this embodiment, there are two throttling surfaces 1220, which are symmetrically arranged on both sides of the adjusting part 120 about the axial direction of the valve stem 100. Each of the two throttling surfaces 1220 forms a fluid channel with the inner wall of the second valve seat 20. Correspondingly, there are also two guide surfaces 1210, located between the two throttling surfaces 1220, which are also symmetrically arranged about the axial direction of the valve stem 100. Thus, the two guide surfaces 1210 on both radial sides of the valve stem 100 provide a more balanced support for the entire valve core 10. Even when the fluid is flowing at high speed, the stability of the fluid flow is ensured, improving the stability of the fluid flow rate and guaranteeing the stable flow regulation function of the control valve. Furthermore, it prevents the entire valve core 10 structure from being affected by the shaking of the adjusting part 120.

[0091] Optionally, the valve core 10 further includes a second limiting part 130, which is disposed between the main body 110 and the adjusting part 120. The second limiting part 130 protrudes radially from the outer wall of the valve stem 100. In the closed state, the second limiting part 130 abuts against the second valve port 210 to limit the valve core 10 and ensure the relative position between the main body 110 and the second valve seat 20.

[0092] It should be noted that in the related technology, the throttle valve achieves the sealing of the valve cavity 220 by abutting the conical throttle surface 1220 with the second valve port 210 of the second valve seat 20. In this structure, in order to achieve a better sealing effect, the machining accuracy and assembly accuracy requirements of the second valve port 210 of the second valve seat 20 and the throttle surface 1220 of the valve core 10 are relatively high. However, since the valve core 10 needs to undertake multiple functions such as throttling, guiding and sealing at the same time, the structure of the throttle surface 1220 of the valve core 10 is not easy to maintain and is prone to failure, affecting the sealing effect, thus causing the control valve to fail to block the fluid in the closed state. In this embodiment, by providing a second limiting part 130 that protrudes radially from the outer wall of the valve stem 100, the valve core 10 can block the second valve port 210 by abutting against the second valve port 210 through the second limiting part 130. The adjusting part 120 no longer needs to bear the sealing function of the valve cavity 220 of the second valve seat 20, which not only helps to ensure the structural reliability of the adjusting part 120, but also ensures the sealing effect of the valve cavity 220.

[0093] Specifically, as shown in Figures 11 to 13, the second limiting part 130 is located at the top of the throttling surface 1220. That is, the top of the throttling surface 1220 and the bottom of the second limiting part 130 are in the same plane. In this way, when the second limiting part 130 abuts against the second valve port 210 of the second valve seat 20, the entire adjusting part 120 is located inside the valve cavity 220 of the second valve seat 20, which reduces the size waste of the adjusting part 120 and also helps to improve the flexibility of the axial dimension of the second valve seat 20.

[0094] Furthermore, the second limiting part 130 is continuously arranged along the circumference of the valve stem 100 to form a limiting ring. The continuous limiting ring structure can ensure the limiting of the valve core 10 and the sealing effect of the second valve seat 20 in the circumference of the valve stem 100.

[0095] In practical applications, since the second limiting part 130 abuts against the second valve port 210 in the closed state, the second limiting part 130 can not only limit the movement of the valve core 10, but also seal the valve cavity 220 inside the second valve seat 20 when it abuts against the second valve port 210. When the second limiting part 130 is continuously arranged along the axial direction of the valve stem 100, the second limiting part 130 can abut against the second valve port 210 of the second valve seat 20 in the circumferential direction, thereby improving the sealing effect of the second limiting part 130 on the second valve seat 20.

[0096] Optionally, the second limiting part 130 includes a first sealing surface 1310. The first sealing surface 1310 is disposed on the side of the second limiting part 130 near the adjusting part 120. In the closed state, the first sealing surface 1310 is sealed to the second valve port 210 to seal the valve cavity 220 of the second valve seat 20 and block the flow of fluid in the fluid channel.

[0097] Specifically, the first sealing surface 1310 is a plane extending radially outward along the valve stem 100. This planar structure is easier to process and easier to cooperate with other structures such as the second valve seat 20 or the seal 30.

[0098] It should be noted that by providing a first sealing surface 1310 in the second limiting part 130, the sealing contact area between the valve core 10 and the second valve seat 20 is increased, thereby enhancing the sealing effect. Simultaneously, the first sealing surface 1310 can be used to install the sealing element 30 or to coat a sealing layer, thereby further optimizing the sealing performance and ensuring a stable sealing state under long-term operation and complex working conditions.

[0099] In summary, the valve core 10 provided in this application embodiment may include at least the following advantages:

[0100] In this embodiment, the valve stem has a guide surface and a throttling surface. In the throttling state, the throttling surface and the inner wall of the second valve seat form a fluid channel for fluid passage, thereby realizing the throttling function of the control valve. In this state, when the fluid passes through the fluid channel, the guide surface abuts against the inner wall of the second valve seat, and the inner wall of the second valve seat can provide support for the valve stem of the valve core, preventing the valve stem from being subjected to high-speed scouring from the fluid and generating high-frequency vibration. This improves the overall stability of the valve core in the throttling state, ensuring the stable flow regulation function of the control valve. At the same time, since the high-frequency vibration of the valve stem is avoided, the overall structural strength of the valve core can be guaranteed, thereby extending the service life of the valve core and the control valve.

[0101] As shown in Figures 17 to 26, this application embodiment also provides a control valve, which includes a second valve seat 20 and a valve core 10 as described in any of the above claims, wherein the valve core 10 is movably connected to the second valve seat 20. Because the valve core 10 has a guide surface 1210 that abuts against the inner wall of the second valve seat 20 in a throttling state, the valve core 10 can maintain a stable throttling state, improving the stability of fluid regulation in the control valve.

[0102] Furthermore, a valve cavity 220 extending axially along the second valve seat 20 is provided inside the second valve seat 20. The valve cavity 220 has a second valve port 210. In the closed state, the adjusting part 120 extends into the valve cavity 220 and blocks the second valve port 210. In the throttling state, the guide surface 1210 abuts against the inner wall of the valve cavity 220. The throttling surface 1220 and the inner wall of the valve cavity 220 enclose each other to form a fluid channel for fluid passage.

[0103] Referring to Figures 17 to 21, which are schematic diagrams of the control valve in the closed state, and to Figures 22 to 26, which are schematic diagrams of the control valve in the throttling state, as shown in Figures 17 to 21, in the closed state, the regulating part 120 is fully inserted into the valve cavity 220, the throttling surface 1220 abuts against the second valve port 210, and the second valve port 210 is in the closed state. At this time, fluid cannot flow in the fluid channel. As shown in Figures 22 to 26, in the throttling state, only a portion of the regulating part 120 is inserted into the valve cavity 220. At this time, the guide surface 1210 abuts against the cavity wall of the valve cavity 220 to provide a certain support for the regulating part 120 and the entire valve core 10. The throttling surface 1220 is spaced from the second valve port 210 of the valve cavity 220, and the second valve port 210 is in the open state, allowing fluid to enter the fluid channel of the valve cavity 220 through the second valve port 210. By changing the depth of the adjusting part 120 extending into the valve cavity 220, the opening degree of the second valve port 210 and the cross-sectional area of ​​the fluid passage in the radial direction of the valve stem 100 can be adjusted, thereby achieving different throttling effects.

[0104] Optionally, the valve core 10 further includes a second limiting part 130. The second limiting part 130 has a first sealing surface 1310 on the side near the second valve seat 20, and the second valve port 210 has a second sealing surface 230. In the closed state, the first sealing surface 1310 and the second sealing surface 230 are sealed together to seal the valve cavity 220.

[0105] In this embodiment, the first sealing surface 1310 and the second sealing surface 230 are adapted to each other. Both the first sealing surface 1310 and the second sealing surface 230 are sealing planes. The sealing connection between the first sealing surface 1310 and the second sealing surface 230 increases the sealing contact area, effectively preventing fluid leakage when the control valve is closed. Simultaneously, this sealing connection via sealing surfaces eliminates the need for the adjusting part 120 to perform the sealing function of the valve cavity 220, allowing for lower machining precision in the adjusting part 120, which helps reduce production costs and improve production efficiency.

[0106] In one optional embodiment of this application, the control valve further includes a seal 30, which is connected to at least one of the first sealing surface 1310 and the second sealing surface 230. In the closed state, the seal 30 is connected between the first sealing surface 1310 and the second sealing surface 230.

[0107] Optionally, the seal 30 can be disposed on the first sealing surface 1310, or on the second sealing surface 230, or both the first sealing surface 1310 and the second sealing surface 230 can be provided with the seal 30. The first sealing surface 1310 and the second sealing surface 230 may have annular sealing grooves, and the seal 30 can be annular and embedded within these annular sealing grooves. It should be noted that the material of the seal 30 can be rubber, silicone, plastic, or composite materials, etc., and this application does not specifically limit this. However, it should be noted that in order to ensure sealing effect and service life, the seal 30 should be selected from materials with high wear resistance and corrosion resistance, while also comprehensively considering the elasticity and rigidity requirements of the seal 30.

[0108] This application also provides a thermal management system, which includes the valve core 10 or control valve described in any of the above claims.

[0109] This application also provides a vehicle, which includes the valve core 10, control valve or thermal management system described in any of the above claims.

[0110] It should be noted that in this embodiment, the structure of the valve core is the same as that of the valve core in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0111] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0112] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A stop device (00) for an electric valve, comprising a stop guide rail (2) having upper and lower stop portions and a stop seat (1) for mounting the stop guide rail (2), the stop seat (1) comprising a spindle (11) and a stepped portion (12), the lower end of the stop guide rail (2) being provided with a fixing portion (23), the stop guide rail (2) being rotated around the spindle (11), and the stepped portion (12) having a limiting groove (121) around the outer periphery of the spindle (11) to limit the circumferential displacement of the stop guide rail (2).

2. The stopping device according to claim 1, wherein, The stepped portion (12) is arranged around the outer periphery of the lower end of the spindle (11), and the upper surface of the stepped portion (12) is provided with a protrusion (122) extending towards the upper end of the stop seat (1). The protrusion (122) and the limiting groove (121) form a first limiting portion (123).

3. The stop device according to claim 2, wherein, The upper surface of the protrusion (122) is an arc-shaped surface (1221), and the arc of the arc-shaped surface (1221) is configured to match the arc of the stop guide rail (2).

4. The stopping device according to claim 2, wherein, The first limiting part (123) has an outer side (1231), an inner side (1232) and a lower side (1233). The outer side (1231) is in contact with the stop guide rail (2), and the inner side (1232) is connected to the top wall (1211) of the limiting groove.

5. The stopping device according to claim 1, wherein, The upper surface of the stepped portion (12) is also provided with a concave arc-shaped transition surface (124), which is connected to the lower bottom surface (1212) of the limiting slot (121).

6. The stopping device according to claim 1, wherein, The distance from the top wall (1211) to the bottom surface (1212) is h1, and the distance from the bottom side surface (1233) to the bottom surface (1212) is h2, where h1>h2.

7. The stopping device according to claim 1, wherein, The upper stop (21) is an upward right-angle bend and extension portion provided at the upper end of the stop guide (2), the lower stop (22) is a downward right-angle bend and extension portion provided at the lower end of the stop guide (2), and the fixing portion (23) is a plurality of rounded bends and extension portions at the lower end of the stop guide (2).

8. The stop device according to claim 7, wherein, The fixing part (23) includes a first fixing part, which is the part of the lower stop part (22) that is bent and extended in the direction of parallel guide rail.

9. The stop device according to claim 7, wherein, The fixing part (23) further includes a second fixing part (232), which is the part of the first fixing part that is bent upward and extended.

10. The stopping device according to claim 1, wherein, It also includes a stop ring (3), which is sleeved on the outer periphery of the valve core and is rotatably disposed in the stop guide rail (2). The stop ring (3) has an upper stop portion (31) and a lower stop portion (32) at its upper and lower ends, respectively.

11. The stopping device according to claim 1, wherein, The pitch of the stop ring (3) is L1, and the pitch of the stop guide rail (2) is L2, and 0.2mm>L2-L1>0.1mm.

12. The stopping device according to claim 1, wherein, The shape of the fixing part (23) is adapted to the limiting slot (121).

13. The stop device as claimed in claim 12, wherein, The fixing part (23) is tightly engaged with the limiting slot (121).

14. The stop device as claimed in claim 13, wherein, The stop rail (2) can grip the spindle (11) after being twisted in the forward or reverse direction.

15. The stop device as claimed in claim 1, wherein, The stop rail (2) is a spring.

16. An electric valve (4) comprising a stop device as described in any one of claims 1-15 and a valve needle, the stop device being used to control the opening and closing stroke of the valve needle.

17. A vehicle (5) comprising the electric valve as claimed in claim 16.

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