Stop device, electric valve and vehicle

Abstract

The utility model discloses a stop device, an electric valve and a vehicle, which comprise a stop guide rail with an upper stop part and a lower stop part and a stop seat for mounting the stop guide rail, and are characterized in that the stop seat comprises a mandrel and a step part, a fixing part is arranged at the lower end of the stop guide rail, the stop guide rail surrounds the mandrel through torsion, and the step part is arranged on the step part. And a limiting clamping groove for limiting the circumferential displacement of the guide rail is formed in the step part around the periphery of the core shaft. The stop guide rail is tightly fixed through the limiting clamping groove structure, so that the stop guide rail is limited in the circumferential direction, and the stop ring is prevented from driving the stop guide rail to rotate left and right when moving along the stop guide rail.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, in particular to a stopping device and an electric valve with the stopping device. Background Art

[0002] Existing electric valves generally include a valve body, a rotor, a screw rod, a nut sleeve and a valve needle assembly. The valve body has a receiving cavity and a valve port, and the receiving cavity is communicated with the valve port. The rotor, the nut sleeve and the valve port are arranged at intervals. The rotor is movably arranged in the receiving cavity and can rotate around its own axis during movement. The nut sleeve is arranged in the receiving cavity. One end of the screw rod is fixed on the rotor, and the other end passes through the nut sleeve and is drivingly connected with the valve needle assembly to close or open the valve port. To ensure the stability of the rotation and movement of the rotor assembly, a limiting assembly is usually arranged between the nut sleeve and the rotor, and the limiting assembly generally includes a stopping guide rail and a stop ring. A limiting spring is sleeved on the outer periphery of the nut sleeve. The stop ring is movably arranged on the rotor and is in limiting cooperation with the stopping guide rail. The stopping guide rail provides a limiting track for the movement and rotation of the stop ring. However, the fixing method of the stopping guide rail of the existing stopping device has a poor limiting effect on the possible rotation of the guide rail. Summary of the Utility Model

[0003] The utility model provides a stopping device, an electric valve with the stopping device and a vehicle to better limit the left and right displacement of the guide rail.

[0004] The additional aspects and advantages of the utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the utility model.

[0005] The utility model provides a stopping device, including a stopping guide rail with upper and lower stopping parts and a stopping seat for installing the stopping guide rail. The stopping seat includes a core shaft and a stepped part. The lower end of the stopping guide rail is provided with a fixing part. The stopping guide rail is twisted around the core shaft, and the stepped part is provided with a limiting card slot around the outer periphery of the core shaft to limit the circumferential displacement of the stopping guide rail.

[0006] In one embodiment, the stepped part is arranged around the outer periphery of the lower end of the core shaft, and the upper surface of the stepped part is provided with a convex part extending towards the upper end of the stopping seat. The convex part and the limiting card slot form a limiting part.

[0007] In one embodiment, the upper surface of the convex part is an arc surface adapted to the inclination angle of the guide rail.

[0008] In one embodiment, the limiting part has an outer side surface, an inner side surface and a lower side surface. The outer side surface is in contact with the stopping guide rail, and the inner side surface is connected with the top wall of the limiting groove.

[0009] In one embodiment, a concave arc transition surface is further provided on the upper surface of the step portion, and the transition surface is connected to the lower bottom surface of the limit card slot.

[0010] In one embodiment, the distance from the top wall to the lower bottom surface is greater than the distance from the lower side surface to the lower bottom surface.

[0011] In one embodiment, the upper stop portion is an upward right-angle bend and extension portion provided at the upper end of the stop guide rail, the lower stop portion is a downward right-angle bend and extension portion provided at the lower end of the stop guide rail, and the fixing portion is a plurality of rounded bends and their extension portions at the lower end of the stop guide rail.

[0012] In one embodiment, the fixing portion includes a first fixing portion formed by bending and extending the end of the lower stop portion in the direction of the parallel guide rail and a second fixing portion formed by bending and extending the end of the first fixing portion upward, and the bends are all rounded structures.

[0013] In one embodiment, the stop device further includes a stop ring, the stop ring is sleeved on the outer periphery of the valve core, and the stop ring is rotatably arranged in the stop guide rail.

[0014] In one embodiment, the pitch of the stop ring is L1, the pitch of the stop guide rail is L2, and 0.1mm > L2 - L1 > 0.1mm.

[0015] In a second aspect, the present invention further provides an electric valve, including a stop device and a valve needle, and the stop device is used to control the opening and closing stroke of the valve needle.

[0016] In a third aspect, the present invention further provides a vehicle, including an electric valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a cross-sectional view of the electric valve provided by the present invention;

[0019] Figure 2 is a schematic assembly structure diagram in a specific embodiment provided by the present invention;

[0020] Figure 3 is a schematic assembly structure diagram in a specific embodiment provided by the present invention;

[0021] Figure 4 is a schematic structure diagram of the stop seat in a specific embodiment provided by the present invention;

[0022] Figure 5 It is a schematic structural diagram of a limit card slot in a specific embodiment provided by the present utility model;

[0023] Figure 6 It is a schematic structural diagram of a stop guide rail in a specific embodiment provided by the present utility model;

[0024] Figure 7 It is a schematic structural diagram of a stop ring in a specific embodiment provided by the present utility model;

[0025] Figure 8 It is a schematic structural diagram of a stop guide rail in another specific embodiment provided by the present utility model;

[0026] Figure 9 It is a schematic structural diagram of a stop ring in another specific embodiment provided by the present utility model.

[0027] Reference numerals:

[0028] 00, stop device; 1, stop seat; 11, mandrel; 12, stepped portion; 121, limit card slot; 1211, top wall; 1212, lower bottom surface; 122, protruding portion; 1221, arc surface; 123, limiting portion; 1231, outer side surface; 1232, inner side surface; 1233, lower side surface; 124, transition surface; 2, stop guide rail; 21, upper stop portion; 22, lower stop portion; 23, fixing portion; 231, first fixing portion; 232, second fixing portion; 3, stop ring; 31, upper stop portion; 32, lower stop portion; 4, electric valve; 41, sleeve; 42, rotor assembly; 421, limit rod; 43, screw assembly; 44, valve core assembly; 45, compression nut; 46, valve body; 47, valve needle assembly; 48, valve seat. Specific embodiments

[0029] In order to more comprehensively understand the features and technical content of the embodiments of the present utility model, the implementation of the embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and explanation purposes and are not used to limit the embodiments of the present utility model. In the following technical description, for the sake of convenience of explanation, multiple details are provided to fully understand the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0030] The stop device 00 provided by the present utility model is applicable to an electric valve 4 as shown in Figure 1 The working principle of the stop device 00 will be explained below in conjunction with the overall structure of the electric valve 4.

[0031] 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 compression nut 45, a valve body 46, a valve needle assembly 47, and a valve seat 48.

[0032] A stator is provided outside 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, and under the traction of the rotating magnetic field of the stator, the rotor assembly 42 performs a rotating motion; the rotor assembly 42 is fixedly connected to the screw assembly 43. When the rotor assembly 42 performs a rotating motion, 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 limiting rod 421, and the limiting rod 421 cooperates with the stop device 00 to limit the number of rotation turns of the rotor assembly 42; the sleeve 41, the valve body 46, and the valve core assembly 44 are fixedly connected, and a vertically penetrating hole is provided in the middle of the valve core assembly 44, and internal threads are provided in the middle of the above-mentioned penetrating hole. A part of the screw assembly 43 is arranged in the penetrating hole of the valve core assembly 44, and external threads are provided on a part of the outer circle of the screw assembly 43, and the external threads of the screw cooperate with the internal threads of the valve core to convert the rotating motion of the screw assembly 43 into an axial linear motion; the screw assembly 43 and the valve needle assembly 47 are arranged in an axially limited connection. When the screw assembly 43 generates an axial linear motion, it can drive the valve needle assembly 47 to generate the same motion, so that the valve needle assembly 47 moves away from or approaches the valve port provided on the valve seat 48; the compression nut 45 is fixedly connected to the main body through threads, and the compression nut 45 presses the expansion valve onto the main body. When the valve needle assembly 47 moves away from the valve port provided on the valve seat 48, the fluid can enter from the fluid inlet and flow out through the valve port. As described above, by controlling the distance between the valve needle assembly 47 and the valve port, the flow rate of the electric valve 4 can be controlled.

[0033] The following introduces the first aspect of the present invention. The present invention provides a stop device 00, which includes a stop guide rail 2 having upper and lower stop portions 22 and a stop seat 1 for installing the stop guide rail 2. The stop seat 1 includes a core shaft 11 and a stepped portion 12. The lower end of the stop guide rail 2 is provided with a fixing portion 23. The stop guide rail 2 is wound around the core shaft 11 by torsion, and the stepped portion 12 is provided with a limit card slot 121 for defining the circumferential displacement of the guide rail around the outer periphery of the core shaft 11.

[0034] It is worth noting that the stepped portion 12 is provided with a limit card slot 121 around the outer periphery of the core shaft 11. The shape of the fixing portion 23 of the stop guide rail 2 is adapted to the limit card slot 121, and the shape of the stop guide rail 2 is close to a "U" shape. The design of the upward bending of the tail end makes the fixing portion 23 of the stop guide rail 2 tightly clamped with the limit card slot 121, and strictly limits the fixing portion 23 in both the left and right directions, thereby avoiding the circumferential displacement of the stop guide rail 2 driven by the stop ring 3 during the sliding process when the electric valve 4 works.

[0035] It can be understood that the circumferential direction refers to the circumferential direction of the circle where the cross-section of the mandrel 11 with a cylindrical shape is located along the direction perpendicular to the 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 in the circumferential direction of the mandrel 11. Generally speaking, that is, the stop ring 3 may drive the stop guide rail 2 to rotate, and the design of the limit card slot 121 of the present utility model can tightly fix the stop guide rail 2 in the circumferential direction, preventing it from rotating left and right, that is, preventing it from generating circumferential displacement.

[0036] The stop device 00 of the present utility model is provided with a stop seat 1, a stop guide rail 2 and a stop ring 3. A limit card slot 121 is opened at the step portion 12 on the outer periphery of the lower end of the mandrel 11 of the stop seat 1. The shape of the limit card slot 121 is adapted to the fixed portion 23 of the stop guide rail 2. The stop guide rail 2 is tightly fixed through the card slot structure, so as to perform circumferential limit on the stop guide rail 2, prevent the stop ring 3 from driving the stop guide rail 2 to rotate left and right when moving along the stop guide rail 2, and strengthen the firmness of the connection between the stop guide rail and the stop seat.

[0037] Specifically, please refer to Figure 2 and Figure 3 In the stop device 00 of the present utility model, a fixed portion 23 is provided at the lower end of the stop guide rail 2. After the stop guide rail 2 is twisted forward or backward, it can hold the mandrel 11 tightly, and then the lower fixed portion 23 is fixedly connected to the limit card slot 121 of the step portion 12 at the lower end of the mandrel 11, so that the axial and circumferential directions of the entire stop guide rail 2 are fixedly connected to the mandrel 11.

[0038] It can be understood that since the stop guide rail 2 holds the mandrel 11 tightly after being twisted, the inner diameter of the stop guide rail 2 can be set to be slightly larger or slightly smaller than the outer diameter of the mandrel 11 to improve the positioning stability of the two. Since the inner diameter of the stop guide rail 2 is slightly smaller than the outer diameter of the mandrel 11, the stop guide rail 2 needs to be twisted backward to increase its inner diameter so that it can be smoothly sleeved on the mandrel 11. Also, since the inner diameter of the stop guide rail 2 is smaller than the outer diameter of the mandrel 11, when the stop guide rail 2 is twisted backward, there must be a reaction force for forward twisting to restore the deformation. Under the action of this reaction force, the inner diameter of the stop guide rail 2 has a shrinking tendency, so as to hold the mandrel 11 tightly and avoid sliding relative to the mandrel 11.

[0039] At the same time, the limit card slot 121 can also be arranged in front of the fixed portion 23, and then the stop guide rail 2 is twisted against its rotation direction, so that the fixed portion 23 moves to a position corresponding to the limit card slot 121, and twists along the direction from the opening to the bottom wall of the limit card slot 121 to extend into the limit card slot 121 for clamping, so as to realize the fixed connection between the two.

[0040] Further, the stop guide rail 2 of the present utility model is usually a spring. Taking the torsional direction of the spring as the positive direction and the direction opposite to the torsional direction of the spring as the negative direction; 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. When the spring is left-handed, the left side is higher, and when the spring is right-handed, the right side is higher. When the spring is twisted in the positive direction, the number of its coils increases, and when the spring is twisted in the negative direction, the number of its coils decreases; in this article, against the helix direction of the stop guide rail 2 means the negative direction, and along the helix direction of the stop guide rail 2 means the positive direction.

[0041] In this article, the front and back are referenced by the torsional 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 back; the axial direction and the circumferential direction in this article are referenced by the mandrel 11. The extending 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 in this article refer to the direction parallel to the axis of the mandrel 11. Among them, the end of the mandrel 11 connected to the valve seat 48 is the lower end, and the other end is the upper end.

[0042] In one embodiment, the stepped portion 12 is disposed around the outer periphery of the lower end portion of the mandrel 11. A convex portion 122 extending upward to the upper end of the stop seat 1 is provided on the upper surface of the stepped portion 12. The convex portion 122 and the limit card slot 121 construct a limiting portion 123.

[0043] Specifically, the stepped portion 12 is disposed at the lower end of the mandrel 11, and its outer diameter is slightly larger than that of the mandrel 11. Therefore, a step with a certain thickness is formed with the mandrel 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 cooperate with the convex portion at the end of the stop guide rail 2, the upper surface of the stepped portion 12 is also provided with a convex structure. The surface of the stepped portion 12 and the limit card slot 121 enclose a limiting portion 123 that is close to a square shape.

[0044] In one embodiment, the upper surface of the convex portion 122 is an arc surface 1221 adapted to the radian of the stop guide rail. By adjusting the shape of the upper end surface of the stepped 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 beneficial to increasing the axial height ratio of the mandrel 11 relative to the stop seat 1. The mandrel 11 is used to cooperate with the stop guide rail 2, and at least part of the stop guide rail 2 is located on the outer periphery of the mandrel 11. Increasing the axial height ratio of the mandrel 11 relative to the stop seat 1 is beneficial to increasing the number of turns of the stop guide rail 2, increasing the angle range that the rotor assembly 42 can rotate, increasing the displacement of the valve core assembly 44, and further beneficial to increasing the flow regulation range of the electric valve 4.

[0045] In one embodiment, the upper surface of the step portion 12 is further provided with a concave arc transition surface 124, and the transition surface 124 is connected to the lower bottom surface 1212 of the limit card slot 121. The arc transition surface 124 can play a guiding role when the stop guide rail 2 is assembled to the limit card slot 121, so that the guide rail fixing portion 23 is automatically guided to the clamping position, facilitating installation and fixation.

[0046] In one embodiment, the limiting portion 123 has an outer side surface 1231, an inner side surface 1232, and a lower side surface 1233. Among them, the outer side surface 1231 is in contact with the stop guide rail 2, which can limit the displacement of the stop guide rail 2 in its direction. The inner side surface 1232 is connected to the top wall 1211 of the limit card slot 121, and the distance from the top wall 1211 to the lower bottom surface 1212 is greater than the distance from the lower side surface 1233 to the lower bottom surface 1212, that is, the hook structure at the right half end of the "U" - shaped fixing portion 23 of the stop guide rail 2. The upward hook structure at the end of the stop guide rail 2 limits the circumferential displacement generated by the stop guide rail 2 during the rotation of the rotor and the stop ring 3, making the fixing force in the circumferential direction stronger.

[0047] As Figure 7 shown, in one embodiment, the upper stop portion 21 is an upward right - angled bending and extending portion provided at the upper end of the stop guide rail 2, and the lower stop portion 22 is a downward right - angled bending and extending portion provided at the lower end of the stop guide rail 2. Specifically, the bending structures of the upper and lower stop portions 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 stop function.

[0048] Please refer to Figure 7 , the fixing portion 23 is a plurality of rounded - corner bends and their extending portions at the lower end of the stop guide rail 2. Specifically, the fixing portion 23 includes a first fixing portion 231 formed by bending and extending the end of the lower stop portion 22 in the direction parallel to the guide rail and a second fixing portion 232 formed by bending and extending the end of the first fixing portion 231 upward, and the bends are all rounded - corner structures. Specifically, the fixing portion 23 forms a "U" - shaped structure through a plurality of rounded - corner bends, and the core seat step portion 12 is provided with a limit card slot 121 adapted to its structure, and the two are closely combined to realize the fixation of the stop guide rail 2.

[0049] Please refer to Figure 8 and Figure 9 , in another embodiment of the present utility model, the fixing portion 23 includes a first fixing portion 231 formed by bending and extending the end of the lower stop portion 22 in the direction parallel to the guide rail, that is, the shape of the fixing portion 23 is an "L" - shape. Correspondingly, the limit card slot 121 is also set as an L - shaped groove adapted to it to fix the stop guide rail 2. At the same time, the limit card slot 121 fixes the left and right sides of the guide rail below the lower stop portion 22 of the stop guide rail 2, thereby performing circumferential limitation on the stop guide rail 2 to prevent the stop ring 3 from driving the stop guide rail 2 to rotate left and right when moving along the stop guide rail 2.

[0050] In one embodiment, the stop device 00 further includes a stop ring 3. The stop ring 3 is sleeved on the outer periphery of the valve core, and the stop ring 3 is rotatably arranged in the stop guide rail 2. The upper and lower ends of the stop ring 3 respectively have an upper stop portion 31 and a lower stop portion 32, and the upper stop portion 31 is a structure bent outward.

[0051] Further, the stop ring 3 is in sliding fit with the spiral part of the stop guide rail 2. Specifically, the stop ring 3 is sleeved on the stop guide rail 2, and the stop ring 3 can rotate spirally 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 of 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 together with the rotor assembly 42. Under the action of the spring guide rail, the stop ring 3 moves axially while rotating.

[0052] In one embodiment, the diameter of the stop guide rail 2 is 0.6 mm, and the diameter of the stop ring 3 is 0.8 mm.

[0053] Please further combine Figure 2 and Figure 3 , Figure 2 which is the schematic assembly structure diagram of the stop device 00 provided by the present invention in the first specific embodiment; Figure 3 which is the schematic assembly structure diagram of the stop device 00 provided by the present invention in the second specific embodiment. As Figure 2 shown, when the stop ring 3 moves upward to the upper end of the core seat cylindrical portion, 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, thereby reaching its upper displacement limit. As Figure 3 shown, when the stop ring 3 moves downward to the lower end of the above-mentioned cylindrical portion, the lower stop portion 32 of the stop ring 3 is blocked by the lower stop portion 22 of the spring guide rail, thereby 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.

[0054] In one embodiment, the pitches of the stop ring 3 and the stop guide rail 2 are 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.

[0055] Specifically, the limiting 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 limiting 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. Among them, the pitch of the stop ring 3 is L1, and the pitch of the limiting guide rail is L2. Applying the technical solution of the present invention, under the driving action of the rotor, the screw drives the valve needle assembly 47 to close or open the 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 limiting 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 limiting 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 axial limit of the limiting guide rail on the stop ring 3, reducing the phenomenon of the stop ring 3 moving around during the movement, and further reducing the noise generated by the collision between the stop ring 3 and the limiting guide rail.

[0056] Furthermore, when L2 - L1 < 0.1 mm, there may be a situation where the stop ring 3 and the limiting guide rail are worn. After long-term use, the limiting 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 limiting guide rail is too large. During the movement of the stop ring 3, the stop ring 3 may move around, causing the stop ring 3 to collide with the limiting 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 limiting guide rail.

[0057] The stop device 00 of the present invention is provided with a stop seat 1, a stop guide rail 2 and a stop ring 3. A limiting card slot 121 is opened on the stepped portion 12 at the lower end outer periphery of the mandrel 11 of the stop seat 1. The shape of the limiting card slot 121 is adapted to the fixed portion 23 of the stop guide rail 2. The stop guide rail 2 is tightly fixed through the card slot structure, thereby performing circumferential limitation on the stop guide rail 2 to prevent the stop ring 3 from driving the stop guide rail 2 to rotate left and right when moving along the stop guide rail 2.

[0058] Please refer to Figure 1 , on the second aspect, the present invention 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, a stop device 00, a screw assembly 43, a valve core assembly 44, a compression nut 45, a valve body 46, a valve needle assembly 47, and a valve seat 48.

[0059] A stator is provided outside 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 performs a rotating motion; the rotor assembly 42 is fixedly connected to the screw assembly 43. When the rotor assembly 42 performs a rotating motion, 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 limiting rod 421, and the limiting rod 421 cooperates with the stop device 00 to limit the number of rotation turns of the rotor assembly 42; the sleeve 41, the valve body 46, and the valve core assembly 44 are fixedly connected, and a through hole penetrating up and down is provided in the middle of the valve core assembly 44, and internal threads are provided in the middle of the above-mentioned through hole. A part of the screw assembly 43 is arranged in the through hole of the valve core assembly 44, external threads are provided on a part of the outer circle of the screw assembly 43, and the external threads of the screw cooperate with the internal threads of the valve core to convert the rotating motion of the screw assembly 43 into an axial linear motion; the screw assembly 43 and the valve needle assembly 47 are arranged in an axially limited connection. When the screw assembly 43 generates an axial linear motion, it can drive the valve needle assembly 47 to generate the same motion, so that the valve needle assembly 47 moves away from or approaches the valve port provided on the valve seat 48; the compression nut 45 is fixedly connected to the main body through threads, and the compression nut 45 presses the expansion valve onto the main body. When the valve needle assembly 47 moves away from the valve port provided on the valve seat 48, the fluid can enter from the fluid inlet and flow out through the valve port.

[0060] The electric valve 4 of the present invention includes the aforementioned stop device 00. A limiting component is arranged between the nut sleeve and the rotor. And the limiting component generally includes a stop guide rail 2 and a stop ring 3. The limiting spring is sleeved on the outer circumference of the nut sleeve. The stop ring 3 is movably arranged on the rotor and is in limiting 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 rotation turns of the rotor assembly 42, so as to control the distance between the valve needle assembly 47 and the valve port, and thus control the flow rate of the electric valve 4.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in accordance with actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation terms 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 thus should not be construed as limiting the protection scope of the present utility model; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0064] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawing and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawing of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0065] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0066] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A stop device 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), characterized in that, The stop seat (1) includes a mandrel (11) and a stepped portion (12). The lower end of the stop guide rail (2) is provided with a fixing portion (23). The stop guide rail (2) twists around the mandrel (11), and the stepped portion (12) is provided with a limit card slot (121) around the outer circumference of the mandrel (11) to limit the circumferential displacement of the guide rail.

2. The stop device according to claim 1, characterized in that, The stepped portion (12) is arranged around the outer circumference of the lower end portion of the mandrel (11). The upper surface of the stepped portion (12) is provided with a convex portion (122) extending upward to the upper end of the stop seat (1). The convex portion (122) and the limit card slot (121) construct a limiting portion (123).

3. The stop device according to claim 2, characterized in that, The upper surface of the convex portion (122) is an arc surface (1221), and the radian of the arc surface (1221) is configured to be adapted to the stop guide rail (2).

4. The stopping device according to claim 2, characterized in that, The 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) is in contact with the stop guide rail (2), and the inner side surface (1232) is connected to the top wall (1211) of the limit groove.

5. The stop device according to claim 4, characterized in that The upper surface of the stepped portion (12) is also provided with a concave arc transition surface (124), and the transition surface (124) is connected to the bottom surface (1212) of the limit card slot (121).

6. The stop device according to claim 5, characterized in that, The distance from the top wall (1211) to the bottom surface (1212) is h1, and the distance from the lower side surface (1233) to the bottom surface (1212) is h2, and h1 > h2.

7. The detent device according to claim 1, characterized in that, The stop guide rail includes an upper stop portion and a lower stop portion. The upper stop portion (21) is an upward right-angle bending and extending portion provided at the upper end of the stop guide rail (2), and the lower stop portion (22) is a downward right-angle bending and extending portion provided at the lower end of the stop guide rail (2). The fixing portion (23) is a plurality of rounded corner bends and extending portions at the lower end of the stop guide rail (2).

8. The stop device according to claim 7, characterized in that, The fixing portion (23) includes a first fixing portion, and the first fixing portion is a bending and extending portion of the end of the lower stop portion (22) in the direction parallel to the guide rail.

9. The stop device according to claim 8, characterized in that, The fixing portion (23) further includes a second fixing portion (232), and the second fixing portion (232) is a bending and extending portion of the end of the first fixing portion upward.

10. The stop device according to claim 1, characterized in that, It further includes a stop ring (3). The stop ring (3) is sleeved on the outer circumference of the valve core, and the stop ring (3) is rotatably arranged in the stop guide rail (2). The upper and lower ends of the stop ring (3) respectively have an upper stop portion (31) and a lower stop portion (32).

11. The stop device according to claim 10, characterized in that, 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. An electric valve, characterized in that, It includes the stop device according to any one of claims 1-11 and a valve needle. The stop device is used to control the opening and closing stroke of the valve needle.

13. A vehicle, characterized in that, It includes the electric valve according to claim 12.

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