Electronic expansion valve
By setting anti-rotation grooves and stop components on the outer wall of the nut of the electronic expansion valve, the problems of friction and noise in the stop structure are solved, thereby achieving miniaturization and improved reliability of the electronic expansion valve and extending its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-03-24
AI Technical Summary
The existing electronic expansion valve has a friction problem in its stop structure, which makes it unreliable and noisy. In addition, its height and size are large, which is not conducive to installation and service life.
By using an anti-rotation groove and a stop assembly on the outer wall of the nut, the second part of the stop assembly cooperates with the anti-rotation groove to restrict the movement of the stop assembly along the axial direction of the housing, eliminating the need for slip rings and guide springs, thus achieving the limitation and miniaturization of the valve core.
It reduces noise, improves reliability and service life, reduces the height and cost of the electronic expansion valve, and facilitates installation.
Smart Images
Figure CN224034065U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refrigerant control components, and in particular to an electronic expansion valve. Background Technology
[0002] With the rapid development of the automotive industry, automobiles are equipped with an increasing number of devices and functions. As a medium connecting multiple flow paths, the electronic expansion valve is becoming increasingly important in the automobile manufacturing process. In existing technologies, the stop structure of most electronic expansion valves is a circumferential stop. During the relative rotation between the guide spring and the slip ring, there is always a problem of friction between the spring coils. Furthermore, due to the unreliable structure of the guide spring and slip ring themselves, the fit of the stop structure is not secure. At the same time, the large height and size of electronic expansion valves are also unfavorable for installation. Utility Model Content
[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an electronic expansion valve that can reduce the overall height of the electronic expansion valve, which is beneficial for miniaturization, reduces the cost, improves the reliability, and relatively extends the service life of the electronic expansion valve.
[0004] The electronic expansion valve according to an embodiment of the present invention includes: a housing having a cavity; a nut fixed in the cavity, the outer wall of the nut having an anti-rotation groove extending along the axial direction of the housing; a drive assembly disposed on the housing and including a screw extending along the axial direction of the housing, the screw passing through the nut and threadedly connected to the nut; and a stop assembly disposed in the cavity, the stop assembly having a first component and a second component, the first component being sleeved on the screw and fixedly connected to the screw, the second component being disposed outside the first component and rotatably connected to the first component, the second component and the screw moving synchronously in the axial direction of the housing, a portion of the second component extending into the anti-rotation groove.
[0005] According to an embodiment of the present invention, the electronic expansion valve has an anti-rotation groove on the outer wall of the nut. A stop assembly is disposed in the cavity. The stop assembly has a first component and a second component. The first component is sleeved on and fixedly connected to the screw. The second component is disposed outside the first component and rotatably connected to the first component. The second component and the screw move synchronously in the axial direction of the housing. A portion of the second component extends into the anti-rotation groove. The portion of the second component extending into the anti-rotation groove can abut against the inner wall of the anti-rotation groove along the axial direction of the housing, thereby restricting the movement of the stop assembly and the screw along the axial direction of the housing, achieving a limiting effect on the valve core. This relatively reduces the length of movement of the rotor component along the axial direction of the housing, thereby relatively reducing the space left in the housing for the rotor component to move along the axial direction of the housing, reducing the overall height of the electronic expansion valve, making full use of the axial space of the electronic expansion valve, which is conducive to the miniaturization of the electronic expansion valve, reducing the cost of the electronic expansion valve, and facilitating the installation of the electronic expansion valve. Furthermore, by adjusting the height of the anti-rotation groove in the axial direction of the housing, the stroke of the valve core can be adjusted more flexibly. At the same time, by eliminating the design of slip rings and guide springs, the noise problem caused by slip rings stopping guide springs is solved, which can effectively reduce the noise of electronic expansion valves. It also avoids fatigue fracture caused by frequent impacts of the guide spring stop, reduces the risk of stop failure, improves the reliability of electronic expansion valves, and relatively extends the service life of electronic expansion valves.
[0006] In addition, the electronic expansion valve according to this utility model may also have the following additional technical features:
[0007] In some embodiments, the stop assembly includes: a bearing sleeved on the screw, the inner ring of the bearing forming the first component; a stop rod connected to the outer ring of the bearing, the portion of the stop assembly excluding the inner ring of the bearing forming the second component, and a portion of the stop rod extending into the anti-rotation groove.
[0008] In some embodiments, the stop bar includes: a connecting portion located outside the nut and extending along the axial direction of the housing, one end of the connecting portion extending in the direction of extension being connected to the outer ring of the bearing; and a bent portion connected to the end of the connecting portion opposite to the bearing, at least a portion of the bent portion extending into the anti-rotation groove.
[0009] In some embodiments, the stop bar further includes a mating portion, which is disposed at one end of the connecting portion away from the bent portion, and the mating portion is connected to the outer ring of the bearing and extends along the circumferential direction of the bearing.
[0010] In some embodiments, the two ends of the extending direction of the mating part have a first point and a second point respectively, and the center line of the bearing has a third point. The first point, the second point and the third point are in the same plane. The line connecting the first point and the third point is b, and the line connecting the second point and the third point is c. The included angle between the line b and the line c toward the side of the connecting part is A, and satisfies: A≤180°.
[0011] In some embodiments, in a cross-section perpendicular to the axial direction of the housing, the mating portion and the bent portion are located on the same side of the connecting portion.
[0012] In some embodiments, the stop bar is a single piece.
[0013] In some embodiments, the stop assembly further includes: a bearing housing, which is sleeved on the bearing and fixedly connected to the outer ring of the bearing, and the stop rod is fixedly connected to the bearing housing.
[0014] In some embodiments, the outer peripheral wall of the bearing housing has a limiting groove that extends along the circumferential direction of the bearing housing, and a portion of the stop rod is located within the limiting groove.
[0015] In some embodiments, there are multiple anti-rotation grooves, which are spaced apart along the circumferential direction of the nut, and the stop rods are multiple ones corresponding to the multiple anti-rotation grooves.
[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0018] Figure 1 This is a cross-sectional view of an electronic expansion valve according to an embodiment of the present utility model;
[0019] Figure 2 This is a perspective view of the stop assembly of the electronic expansion valve according to an embodiment of the present utility model;
[0020] Figure 3 This is a cross-sectional view of the stop assembly of the electronic expansion valve according to an embodiment of the present invention.
[0021] Figure label:
[0022] 100. Electronic expansion valve;
[0023] 1. Shell; 10. Cavity; 101. First cavity; 102. Second cavity; 11. Connecting hole; 12. Valve port; 13. Valve seat; 14. Sleeve;
[0024] 2. Nut; 21. Anti-rotation groove;
[0025] 3. Drive assembly; 31. Screw; 311. Limiting component; 32. Coil assembly; 33. Rotor assembly; 34. Guide component;
[0026] 4. Stop assembly; 41. Bearing; 42. Stop rod; 421. Connecting part; 422. Bending part; 423. Mating part; 43. Bearing housing; 431. Limiting groove;
[0027] 5. Valve core; 51. Balanced flow channel; 511. First flow channel; 512. Second flow channel; 52. Bushing;
[0028] 6. Elastic component; 61. Ejector pin; 62. Elastic element. Detailed Implementation
[0029] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] The electronic expansion valve 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.
[0034] like Figure 1 As shown, the electronic expansion valve 100 according to an embodiment of the present invention includes a housing 1, a nut 2, a drive assembly 3, and a stop assembly 4.
[0035] Specifically, see the attached document. Figure 1 As shown, the housing 1 protects the internal structure of the electronic expansion valve 100, which helps to extend the service life of the electronic expansion valve 100. The housing 1 has a cavity 10, and the nut 2 is fixed inside the cavity 10. The outer wall of the nut 2 has an anti-rotation groove 21, which is along the axial direction of the housing 1 (see attached figure). Figure 1 Extending in the direction shown (a), the drive assembly 3 is disposed on the housing 1 and includes a screw 31. The screw 31 extends along the axial direction of the housing 1 and passes through the nut 2 and is threadedly connected to the nut 2.
[0036] Further, see Appendix Figure 1 As shown, the stop assembly 4 is disposed inside the cavity 10. The stop assembly 4 has a first component and a second component. The first component is sleeved on the screw 31 and fixedly connected to the screw 31. The second component is disposed outside the first component and rotatably connected to the first component. The second component and the screw 31 move synchronously in the axial direction of the housing 1. Part of the second component extends into the anti-rotation groove 21. Since the nut 2 is fixed inside the cavity 10, the screw 31 is threadedly connected to the nut 2, allowing the screw 31 to move in the axial direction of the housing 1. This, in turn, drives the first component and the second component to move in the axial direction of the housing 1 until the part of the second component extending into the anti-rotation groove 21 abuts against one of the two inner walls of the anti-rotation groove 21 in the axial direction of the housing 1, thus restricting the stop assembly 4 from continuing to move in the axial direction of the housing 1, thereby restricting the screw 31 from continuing to move in the axial direction of the housing 1, achieving the purpose of stopping.
[0037] During the process of the screw 31 driving the stop assembly 4 to move along the axial direction of the housing 1, the cooperation between the second component and the anti-rotation groove 21 can prevent the second component from rotating and limit its movement in the axial direction of the housing 1. This ensures that the second component can only move along the axial direction of the housing 1, preventing the second component from rotating and thus preventing it from not moving along the axial direction of the housing 1 due to rotation. This prevents the electronic expansion valve 100 from failing, ensures the reliability and stability of the electronic expansion valve 100, and extends the service life of the electronic expansion valve 100.
[0038] It should be noted that the reference appendix Figure 1 As shown, the drive assembly 3 also includes a coil component 32, a rotor component 33, and a guide member 34. The coil component 32 is sleeved outside the housing 1, and the rotor component 33 is disposed inside the housing 1. The coil component 32 is located radially outside the rotor component 33 and is disposed opposite to at least a portion of the rotor component 33, for driving the rotor component 33 to rotate. The guide member 34 is fixed inside the rotor component 33, and the screw 31 passes through the guide member 34 along its length (see attached figure). Figure 1 One end of the rotor (in the direction shown in a) is welded to the guide 34, so that the rotor component 33, the guide 34 and the screw 31 rotate synchronously.
[0039] Preferably, one end of the guide member 34 facing the stop assembly 4 is in contact with the first component. During the assembly process, after the guide member 34 is fitted onto the screw 31, the end of the first component facing the guide member 34 can stop the guide member 34, which facilitates the welding connection between the guide member 34 and the screw 31. Furthermore, after welding is completed, the end of the guide member 34 facing the first component can limit the first component in the axial direction.
[0040] It is understandable that, such as Figure 1As shown, when the coil component 32 is energized, the coil component 32 drives the rotor component 33 to rotate. Since the screw 31 is fixedly connected to the rotor component 33 through the guide 34, the rotor component 33 drives the screw 31 to rotate together. The screw 31 and the nut 2 are threaded together to form a threaded pair. The nut 2 is fixed on the housing 1, so that the screw 31 moves along the axial direction of the housing 1, thereby driving the rotor component 33 to move along the axial direction of the housing 1. During the process of the rotor component 33 moving along the axial direction of the housing 1, at least a part of the rotor component 33 is opposite to the coil component 32 to ensure that the coil component 32 drives the rotor component 33 to rotate normally. Furthermore, since the first component is fixedly connected to the screw 31, and the second component moves synchronously with the screw 31 in the axial direction of the housing 1, the stop assembly 4 moves along the axial direction of the housing 1 under the drive of the screw 31 until the part of the second component extending into the anti-rotation groove 21 abuts against the inner wall of the anti-rotation groove 21 in the axial direction of the housing 1, thus restricting the stop assembly 4 from continuing to move in the axial direction of the housing 1, thereby restricting the screw 31 from continuing to move in the axial direction of the housing 1, and achieving the purpose of stopping.
[0041] Understandably, current technologies often use a combination of slip rings and guide springs to limit the valve core's position. One of the guide spring and slip ring is fixed, while the other rotates with the rotor. The rotor is stopped by constraining the starting and ending positions of the slip ring. The number of coils in the guide spring determines the number of pulses the rotor can achieve, thus controlling the valve's stroke. On the one hand, the guide spring and slip ring have poor rigidity, making their stopping unreliable and imprecise. Furthermore, friction between the guide spring and slip ring is constant during the slip ring's movement. On the other hand, at the stop position, the shift fork continuously strikes the guide spring or the slip ring's starting structure. Due to the guide spring's thin wire diameter and inherent bending structure, it is prone to breakage. Moreover, the number of coils in the guide spring determines the valve's stroke, making it impossible to compress the valve's height. This not only increases the valve's cost but also contradicts the miniaturization requirements of OEMs.
[0042] This invention allows the portion of the second component extending into the anti-rotation groove 21 to move within it, abutting against the inner wall of the anti-rotation groove 21 along the axial direction of the housing 1. When this portion abuts against the inner wall of the anti-rotation groove 21, it restricts the movement of both the second and first components along the axial direction of the housing 1, thereby restricting the movement of the screw 31 along the axial direction of the housing 1. This effectively limits the movement of the valve core 5, relatively reducing the length of movement of the rotor component 33 along the axial direction of the housing 1. This, in turn, reduces the space within the housing 1 for the rotor component 33 to move along the axial direction, thus reducing the overall height of the electronic expansion valve 100. This fully utilizes the axial space of the electronic expansion valve 100, facilitating miniaturization and reducing its cost. Furthermore, by adjusting the height of the anti-rotation groove 21 along the axial direction of the housing 1, the stroke of the valve core 5 can be adjusted more flexibly.
[0043] Furthermore, because the second component and the screw 31 move synchronously in the axial direction of the housing 1, and the screw 31 is threadedly engaged with the nut 2, the axial height of the screw 31 can be reduced through multiple rotations with a small pitch. This effectively reduces the height caused by the cumulative wire diameter and pitch of the spring stop in the prior art, further reducing the height of the electronic expansion valve 100 and facilitating its miniaturization. Simultaneously, by eliminating the slip ring and guide spring design, the noise problem caused by the slip ring stopping the guide spring is solved, effectively reducing the noise of the electronic expansion valve 100. It also avoids fatigue fracture caused by frequent impacts at the guide spring stop, reducing the risk of stop failure, improving the reliability of the electronic expansion valve 100, and relatively extending its service life.
[0044] According to an embodiment of the present invention, the electronic expansion valve 100 has an anti-rotation groove 21 on the outer wall of the nut 2. A stop assembly 4 is disposed in the cavity 10. The stop assembly 4 has a first component and a second component. The first component is sleeved on the screw 31 and fixedly connected to the screw 31. The second component is disposed outside the first component and rotatably connected to the first component. The second component and the screw 31 move synchronously in the axial direction of the housing 1. A portion of the second component extends into the anti-rotation groove 21. The portion of the second component extending into the anti-rotation groove 21 can move along the axis of the housing 1 with the anti-rotation groove 21. The inner walls of the valve core 5 abut against each other in the axial direction, which restricts the movement of the stop assembly 4 and the screw 31 along the axial direction of the housing 1, thereby limiting the valve core 5. This relatively reduces the length of movement of the rotor assembly 33 along the axial direction of the housing 1, thus relatively reducing the space left in the housing 1 for the rotor assembly 33 to move along the axial direction of the housing 1, reducing the overall height of the electronic expansion valve 100, making full use of the axial space of the electronic expansion valve 100, which is conducive to the miniaturization of the electronic expansion valve 100, reducing the cost of the electronic expansion valve 100, and facilitating the installation of the electronic expansion valve 100. Furthermore, by adjusting the height of the anti-rotation groove 21 in the axial direction of the housing 1, the stroke of the valve core 5 can be adjusted more flexibly. At the same time, because the design of the slip ring and guide spring is eliminated, the noise problem caused by the slip ring stopping the guide spring is solved, which can effectively reduce the noise of the electronic expansion valve 100, while avoiding the fatigue fracture problem caused by frequent impacts of the guide spring stop position, reducing the risk of stop failure, improving the reliability of the electronic expansion valve 100, and relatively extending the service life of the electronic expansion valve 100.
[0045] In some embodiments of this utility model, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the stop assembly 4 includes a bearing 41 and a stop rod 42. The bearing 41 is sleeved on the screw 31 along the axial direction of the housing 1. The bearing 41 is spaced apart from the nut 2. The inner ring of the bearing 41 forms a first component. The stop rod 42 is connected to the outer ring of the bearing 41. The parts of the stop assembly 4, except for the inner ring of the bearing 41, together form a second component. Part of the stop rod 42 extends into the anti-rotation groove 21. The stop rod 42, through its cooperation with the anti-rotation groove 21, can restrict the movement of the entire stop assembly 4 in the axial direction of the housing 1, thereby restricting the movement of the screw 31 in the axial direction of the housing 1 and achieving the stopping effect. The bearing 41 ensures that the relative rotation between the second component and the screw 31 is synchronized in the axial direction of the housing 1, so that the stop rod 42 only moves in the axial direction of the housing 1, thereby achieving axial limiting.
[0046] Understandably, when the coil component 32 is energized, it drives the rotor component 33 to rotate, which in turn drives the screw 31 to rotate. Because the screw 31 is threadedly connected to the nut 2, the screw 31 moves along the axial direction of the housing 1 while rotating. Because the inner ring of the bearing 41 is press-fitted to the screw 31, the inner ring of the bearing 41 rotates synchronously with the screw 31, and the entire bearing 41 moves along the axial direction of the housing 1 along with the screw 31. Because the stop rod 42 is connected to the outer ring of the bearing 41, the bearing 41 can drive the stop rod. The rod 42 moves along the axial direction of the housing 1, causing the part of the stop rod 42 that extends into the anti-rotation groove 21 to move along the axial direction of the housing 1 within the anti-rotation groove 21 until the part of the stop rod 42 that extends into the anti-rotation groove 21 abuts against the inner wall of the anti-rotation groove 21 near or away from the bearing 41. The stop rod 42 can no longer move along the axial direction of the housing 1, so that the entire stop assembly 4 no longer moves along the axial direction of the housing 1, thereby restricting the screw 31 from moving along the axial direction of the housing 1 and achieving the purpose of stopping.
[0047] Of course, this utility model is not limited to this. The inner ring of the bearing 41 and the screw 31 are not limited to interference fit. They can also be directly welded together. Alternatively, the inner ring of the bearing 41 and the screw 31 can be clearance fit. Two limiting features are provided on the outer wall surface of the screw 31. The two limiting features are located on both sides of the bearing 41 along the axial direction of the housing 1 to limit the movement of the bearing 41 relative to the screw 31 in the axial direction.
[0048] In some embodiments of this utility model, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the stop bar 42 includes a connecting portion 421 and a bent portion 422. The connecting portion 421 is located outside the nut 2 and extends along the axial direction of the housing 1. The extension direction of the connecting portion 421 is shown in the attached figure. Figure 1 One end of the stop rod (in the direction shown in a) is connected to the outer ring of the bearing 41, which can be used to support the bearing 41, ensure the normal movement of the entire stop assembly 4 along the axial direction of the housing 1, and separate the bearing 41 from the nut 2 to avoid interference between the bearing 41 and the nut 2. The bent part 422 is connected to the end of the connecting part 421 away from the bearing 41. The bent part 422 extends in a direction perpendicular to the axis of the housing 1. At least a portion of the bent part 422 extends into the anti-rotation groove 21. The setting of the bent part 422 enables the stop rod 42 to better cooperate with the anti-rotation groove 21, ensuring the anti-stopping effect of the part of the stop rod 42 extending into the anti-rotation groove 21 and the inner wall of the anti-rotation groove 21. It should be noted that at least a portion of the bent portion 422 extends into the anti-rotation groove 21. This can be either only a portion of the bent portion 422 extending into the anti-rotation groove 21, or the entire bent portion 422 being located within the anti-rotation groove 21. This can be adjusted according to the distance between the connecting portion 421 and the outer peripheral wall of the nut 2, and the depth of the anti-rotation groove 21 in the radial direction of the nut 2.
[0049] In a further embodiment of this utility model, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, the stop rod 42 also includes a mating part 423. The mating part 423 is located at one end of the connecting part 421 away from the bent part 422. The mating part 423 is connected to the outer ring of the bearing 41 and extends along the circumferential direction of the bearing 41. The mating part 423 can increase the contact area between the stop rod 42 and the bearing 41, which facilitates the connection between the stop rod 42 and the bearing 41, thereby ensuring the connection reliability of the stop assembly 4 and ensuring the stopping effect of the stop assembly 4.
[0050] In a specific example, see Appendix Figure 1 and attached Figure 3 As shown, the bearing 41 is located on the side of the nut 2 facing the guide member 34 and spaced apart from the nut 2. The stop rod 42 includes a connecting part 421, a bent part 422, and a mating part 423. In the direction from the bearing 41 to the nut 2, the mating part 423, the connecting part 421, and the bent part 422 are arranged and connected in sequence. When the bent part 422 abuts against the inner wall of the anti-rotation groove 21 on the side near the bearing 41, the stop rod 42 no longer continues to move towards the guide member 34, and the entire stop assembly 4 cannot move towards the guide member 34. The screw 31 moves towards the guide 34, preventing the valve core 5 from moving away from the valve port 12, thus achieving the purpose of limiting the movement. When the bent part 422 abuts against the inner wall of the anti-rotation groove 21 on the side away from the bearing 41, the stop rod 42 stops moving away from the guide 34, and the entire stop assembly 4 is unable to move away from the guide 34, preventing the screw 31 from pushing the valve core 5 towards the valve port 12, thus achieving the purpose of limiting the movement.
[0051] It should be noted that the mating part 423 can extend in the circumferential direction of the bearing 41 as an open ring (an incompletely closed ring structure), or it can extend in the circumferential direction of the bearing 41 as a ring.
[0052] In a further embodiment of this utility model, reference is made to the appendix. Figure 2As shown, the two ends of the extending direction of the mating part 423 have a first point and a second point respectively, and the center line of the bearing 41 has a third point. The first point, the second point, and the third point are in the same plane. The line connecting the first point and the third point is b, and the line connecting the second point and the third point is c. The included angle between the line connecting b and the line connecting c toward the side of the connecting part 421 is A, and satisfies: A≤180°. It should be noted that during the assembly of the stop bar 42, at least a portion of the bent part 422 needs to be inserted into the anti-stop bar first. Within the rotating groove 21, after ensuring the fit between the bent part 422 and the anti-rotation groove 21, the mating part 423 is then assembled from the radial side of the bearing 41 onto the outer ring of the bearing 41, and fixedly connected to the outer ring of the bearing 41 by welding or other means. By limiting the included angle A between the connecting line b and the connecting line c towards the side of the connecting part 421 to ≤180°, it is easy to assemble the mating part 423 onto the bearing 41 from the side, ensuring the normal installation of the mating part 423 and ensuring the connection between the stop rod 42 and the bearing 41.
[0053] For example, the included angle A between lines b and c on the side facing the connector 421 can be 30°, 60°, 90°, 120°, 150°, or 180°. In a specific example, refer to the appendix... Figure 2 As shown, the included angle A between line b and line c on the side facing the connecting part 421 is 180°. This can maximize the volume of the mating part 423 while ensuring the normal installation of the mating part 423, thereby increasing the contact area between the mating part 423 and the outer ring of the bearing 41, ensuring the reliability of the connection between the mating part 423 and the bearing 41, and improving the support effect of the stop rod 42 on the bearing 41.
[0054] In a further embodiment of this utility model, reference is made to the appendix. Figure 1 and attached Figure 3 As shown, in a cross-section perpendicular to the axial direction of the housing 1, the mating part 423 and the bent part 422 are located on the same side of the connecting part 421. When the stop rod 42 is assembled onto the electronic expansion valve 100, the mating part 423 and the bent part 422 are assembled from the same side of the nut 2 and the bearing 41. This satisfies the requirement that at least a portion of the bent part 422 is first inserted into the anti-rotation groove 21, and then the mating part 423 is assembled onto the outer ring of the bearing 41. This ensures that the mating part 423 can be assembled onto the bearing 41 from the side of the bearing 41, ensuring the normal installation of the mating part 423 and ensuring the connection between the stop rod 42 and the bearing 41.
[0055] In some embodiments of this utility model, reference is made to the appendix. Figure 2 As shown, the stop rod 42 is a single piece, which has low production cost, can relatively reduce the number of parts in the stop assembly 4, simplify the assembly process of the electronic expansion valve 100, and improve the assembly efficiency of the electronic expansion valve 100.
[0056] In some embodiments of this utility model, reference is made to the appendix. Figure 1 Appendix Figure 2 and attached Figure 3 As shown, the stop assembly 4 also includes a bearing housing 43, which is sleeved on the bearing 41 and fixedly connected to the outer ring of the bearing 41. The stop rod 42 is fixedly connected to the bearing housing 43. The bearing housing 43 is used to support the bearing 41 and can play the role of fixing the bearing 41, bearing the load, and ensuring the normal operation of the bearing 41. Moreover, compared with the outer ring of the bearing 41 being directly connected to the stop rod 42, the addition of the bearing housing 43 can expand the mounting surface of the bearing housing 43, increase the contact area between the stop rod 42 and the bearing housing 43, and make it easier to connect with the stop rod 42.
[0057] It should be noted that, as Figure 1 As shown, when assembling the electronic expansion valve 100, the screw 31 is first installed into the valve core 5, and then the screw 31 and the valve core 5 are installed together into the valve seat 13 of the housing 1. Then the nut 2 is welded to the valve seat 13 to fix the screw 31. Then the bearing 41 and the bearing seat 43 are pressed onto the screw 31. First, the bent part 422 of the stop rod 42 is inserted into the anti-rotation groove 21. Then the mating part 423 of the stop rod 42 is welded to the bearing seat 43. Then the rotor component 33 and the guide 34 are welded to the screw 31, and the sleeve 14 of the housing 1 is welded to the valve seat 13. Finally, the stator component and the sealing ring and other components are assembled.
[0058] Preferably, refer to the appendix Figure 1 As shown, along the radial direction of the bearing housing 43, the outer peripheral wall of the guide member 34 facing the stop assembly 4 is spaced apart from the inner peripheral wall of the bearing housing 43 to avoid the second component being affected by the rotation of the screw 31.
[0059] In a further embodiment of this utility model, reference is made to the appendix. Figure 2 and attached Figure 3 As shown, the outer peripheral wall of the bearing housing 43 has a limiting groove 431, which extends along the circumferential direction of the bearing housing 43. A portion of the stop rod 42 is located within the limiting groove 431. Specifically, the mating part 423 of the stop rod 42 is located within the limiting groove 431, which can improve the support effect of the bearing housing 43 on the mating part 423, facilitate the assembly of the stop assembly 4, and facilitate the production and processing of the electronic expansion valve 100.
[0060] Further, see Appendix Figure 2 and attached Figure 3As shown, the limiting groove 431 is located on the side end face of the bearing seat 43 away from the nut 2. The side of the limiting groove 431 away from the nut 2 is open. When the mating part 423 of the stop rod 42 is assembled onto the bearing seat 43, the friction between the mating part 423 and the wall of the limiting groove 431 can be reduced, thereby reducing the assembly difficulty of the stop rod 42.
[0061] In some embodiments of this utility model, there are multiple anti-rotation grooves 21, which are spaced apart along the circumferential direction of the nut 2. There are multiple stop rods 42 corresponding to the multiple anti-rotation grooves 21. Through the cooperation of the multiple stop rods 42 and the multiple anti-rotation grooves 21, relative rotation between the stop assembly 4 and the nut 2 can be prevented, ensuring the effectiveness of the nut 2 in limiting the stop assembly 4. In turn, multiple points spaced apart in the circumferential direction of the bearing 41 prevent the bearing seat 43 from rotating, ensuring the support strength of the stop rod 42 for the bearing seat 43, preventing the bearing seat 43 and the outer ring of the bearing 41 from rotating, and ensuring that the stop assembly 4 can limit the movement of the screw 31 along the axial direction of the housing 1. This prevents the electronic expansion valve 100 from failing, ensures the reliability and stability of the electronic expansion valve 100, and extends the service life of the electronic expansion valve 100.
[0062] Preferably, there are two anti-rotation grooves 21, which are spaced apart along the circumferential direction of the nut 2 and located on opposite sides of the nut 2. There are two stop rods 42 that correspond one-to-one with the two anti-rotation grooves 21, and the mating parts 423 of the two stop rods 42 are arranged opposite each other.
[0063] In some embodiments of this utility model, reference is made to the appendix. Figure 1 As shown, cavity 10 includes a cavity 10 in the axial direction (see attached diagram). Figure 1 The first cavity 101 and the second cavity 102 are arranged in the direction shown (a). The housing 1 also has a communication hole 11 and a valve port 12 communicating with the first cavity 101. The communication hole 11 is located on the peripheral wall of the housing 1. The valve port 12 is located at the end of the first cavity 101 away from the second cavity 102. The part of the nut 2, the part of the drive assembly 3 and the stop assembly 4 are all located in the second cavity 102. The electronic expansion valve 100 also includes a valve core 5. The valve core 5 is located in the first cavity 101 and connected to the screw 31. The valve core 5 is located on the side of the nut 2 facing the valve port 12. The valve core 5 is movable in the axial direction of the housing 1 to open or close the valve port 12. The valve core 5 has a balance flow channel 51 extending in the axial direction of the cavity 10. Both ends of the balance flow channel 51 in the axial direction of the cavity 10 are open.
[0064] Under the drive of the drive assembly 3, the screw 31 drives the valve core 5 to move along the axial direction of the housing 1. When the valve core 5 opens the valve port 12, the medium can flow into the first cavity 101 from one of the valve port 12 and the connecting hole 11, and then flow from the first cavity 101 to the other of the valve port 12 and the connecting hole 11. When the valve core 5 closes the valve port 12, the medium in the first cavity 101 cannot flow out from the valve port 12, and the medium outside the electronic expansion valve 100 cannot flow into the first cavity 101 from the valve port 12. By opening or closing the valve port 12, different user needs can be met, and the user experience can be improved. For example, the medium can be refrigerant.
[0065] By providing a balance flow channel 51 extending along the axial direction of the cavity 10 on the valve core 5, the medium can enter the balance flow channel 51 from the end facing the valve port 12 and flow along the balance flow channel 51 to the second cavity 102, thereby making the air pressure in the second cavity 102 consistent with the air pressure on the side of the valve core 5 away from the second cavity 102, ensuring that the valve core 5 is always in a pressure balance state during the switching process, and avoiding affecting the normal movement of the valve core 5 along the axial direction of the housing 1.
[0066] In a further embodiment of this utility model, reference is made to the appendix. Figure 1 As shown, the balance flow channel 51 includes a first flow channel 511 and a second flow channel 512 arranged and connected in the axial direction of the housing 1. The first flow channel 511 is located on the side of the second flow channel 512 away from the valve port 12. The inner diameter of the first flow channel 511 is larger than the inner diameter of the second flow channel 512. A bushing 52 is provided on the inner peripheral wall of the end of the first flow channel 511 away from the second flow channel 512. The screw 31 passes through the bushing 52. The end of the screw 31 that extends into the first flow channel 511 has a limiting member 311. The limiting member 311 is located on the side of the bushing 52 facing the valve port 12.
[0067] Further, see Appendix Figure 1 As shown, the electronic expansion valve 100 also includes an elastic component 6. The elastic component 6 is located on the side of the bushing 52 near the second flow channel 512 and includes a pin 61 and an elastic element 62. The pin 61 is located in the first flow channel 511 and on the side of the limiting member 311 facing the valve port 12. One end of the elastic element 62 abuts against the stepped surface between the second flow channel 512 and the first flow channel 511, and the other end abuts against the pin 61. It is used to drive the pin 61 to drive the limiting member 311 to abut against the bushing 52. Compared with the direct fixed connection between the screw 31 and the valve core 5, the setting of the elastic element 62 can directly abut the pin 61 against the screw 31, eliminate gaps, avoid tolerances, make the screw 31 more free, and also avoid the risk of jamming caused by over-tightening the screw 31.
[0068] Understandably, the process of the electronic expansion valve 100 gradually opening is as follows: under the drive of the drive assembly 3, the screw 31 moves in the direction away from the valve port 12, the elastic element 62 gradually resets until the limit element 311 abuts against the bushing 52, and then the screw 31 continues to move in the direction away from the valve port 12, driving the valve core 5 to move in the direction away from the valve port 12, slowly opening the valve port 12 until the bent part 422 of the stop rod 42 abuts against the inner wall of the anti-rotation groove 21 on the side away from the valve port 12. At this time, the medium can flow from one of the valve port 12 and the connecting hole 11 into the first cavity 101, and from the first cavity 101 to the other of the valve port 12 and the connecting hole 11.
[0069] The process of the electronic expansion valve 100 gradually closing: Under the drive of the drive component 3, the screw 31 moves towards the valve port 12. At this time, the valve core 5 and its internal elastic component 6 form a whole. The screw 31 drives the valve core 5 to move towards the valve port 12 until the valve core 5 abuts against the valve port 12. At this time, the screw 31 continues to move towards the valve port 12 and pushes the pin 61 to move towards the valve port 12. The elastic component 62 is compressed to generate a pre-tightening force, which reserves the set valve opening pulse so that the electronic expansion valve 100 can have sufficient sealing force to seal the valve port 12 when the power is off or when it is not running, thus avoiding medium leakage.
[0070] Other configurations and operations of the electronic expansion valve 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.
[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0072] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. An electronic expansion valve characterized by, include: A housing (1) having a cavity (10); Nut (2), the nut (2) is fixed inside the cavity (10), and the outer wall of the nut (2) has an anti-rotation groove (21), the anti-rotation groove (21) extends along the axial direction of the housing (1); A drive assembly (3) is disposed on the housing (1) and includes a screw (31). The screw (31) extends along the axial direction of the housing (1) and passes through the nut (2) and is threadedly connected to the nut (2). Stop assembly (4) is disposed in the cavity (10). The stop assembly (4) has a first component and a second component. The first component is sleeved on the screw (31) and fixedly connected to the screw (31). The second component is disposed outside the first component and rotatably connected to the first component. The second component and the screw (31) move synchronously in the axial direction of the housing (1). A portion of the second component extends into the anti-rotation groove (21).
2. The electronic expansion valve according to claim 1, characterized in that The stop assembly (4) includes: A bearing (41) is sleeved on the screw (31), and the inner ring of the bearing (41) is configured as the first component; A stop bar (42) is connected to the outer ring of the bearing (41). The portion of the stop assembly (4) excluding the inner ring of the bearing (41) together constitutes the second component. A portion of the stop bar (42) extends into the anti-rotation groove (21).
3. The electronic expansion valve according to claim 2, wherein The stop bar (42) includes: A connecting part (421) is located outside the nut (2) and extends along the axial direction of the housing (1). One end of the extending direction of the connecting part (421) is connected to the outer ring of the bearing (41). A bend (422) is connected to the end of the connecting part (421) away from the bearing (41), and at least a portion of the bend (422) extends into the anti-rotation groove (21).
4. The electronic expansion valve according to claim 3, characterized in that, The stop bar (42) also includes: The mating part (423) is provided at one end of the connecting part (421) away from the bent part (422). The mating part (423) is connected to the outer ring of the bearing (41) and extends along the circumferential direction of the bearing (41).
5. The electronic expansion valve according to claim 4, characterized in that, The two ends of the extending direction of the mating part (423) have a first point and a second point respectively, and the center line of the bearing (41) has a third point. The first point, the second point and the third point are in the same plane. The line connecting the first point and the third point is b, and the line connecting the second point and the third point is c. The included angle between the line b and the line c toward the side of the connecting part (421) is A, and satisfies: A≤180°.
6. The electronic expansion valve according to claim 4, characterized in that, In a cross-section perpendicular to the axial direction of the housing (1), the mating part (423) and the bending part (422) are located on the same side of the connecting part (421).
7. The electronic expansion valve according to claim 2, characterized in that, The stop bar (42) is a single piece.
8. The electronic expansion valve according to claim 2, characterized in that, The stop assembly (4) also includes: The bearing housing (43) is sleeved on the bearing (41) and fixedly connected to the outer ring of the bearing (41). The stop rod (42) is fixedly connected to the bearing housing (43).
9. The electronic expansion valve according to claim 8, characterized in that, The bearing housing (43) has a limiting groove (431) on its outer peripheral wall. The limiting groove (431) extends along the circumferential direction of the bearing housing (43), and part of the stop rod (42) is located in the limiting groove (431).
10. The electronic expansion valve according to claim 2, characterized in that, There are multiple anti-rotation grooves (21), and the multiple anti-rotation grooves (21) are spaced apart along the circumferential direction of the nut (2). The stop rods (42) are multiple ones that correspond one-to-one with the multiple anti-rotation grooves (21).