Shaft assembly and electric valve

Abstract

A shaft assembly and an electric valve, wherein the shaft assembly (100) comprises a compound motion assembly (10), a shaft rod assembly (201), and a bearing assembly (40). The shaft rod assembly (201) comprises a shaft rod (20) including a bottom wall portion (22) and a shaft sleeve (30) connected to the shaft rod (20). Along the axial direction of the shaft assembly (100), a part of the compound motion assembly (10) is provided between the shaft sleeve (30) and the bottom wall portion (22). Along the axial direction of the shaft assembly (100), a bearing assembly (40) capable of abutting against the shaft sleeve (30) and the compound motion assembly (10) is provided between the shaft sleeve (30) and the compound motion assembly (10), and / or along the axial direction of the shaft assembly (100), a bearing assembly (40) capable of abutting against the bottom wall portion (22) and the compound motion assembly (10) is provided between the bottom wall portion (22) and the compound motion assembly (10). The bearing assembly (40) is arranged along the circumferential direction of the compound motion assembly (10) and comprises a plurality of rolling elements (412) that can rotate by the action of the compound motion assembly (10). Thereby, it becomes possible to reduce the wear of the compound operation assembly (10) and / or the shaft rod assembly (201).

Description

Technical Field

[0001] This application claims priority based on a Chinese patent application filed with the China National Intellectual Property Administration on July 26, 2022, with an application number of 202210881670.3 and an invention title of "Shaft Assembly and Electric Valve", and the entire content thereof is incorporated herein by reference.

[0002] The present invention relates to the field of fluid control, and specifically, to a shaft assembly and an electric valve.

Background Art

[0003] Generally, mechanical components such as electric valves include a shaft assembly having a compound motion rod and a moving rod. Among them, since the nut assembly can convert the rotational motion of the compound motion rod into a linear motion, the compound motion rod can drive the moving rod to perform a linear motion. However, during the rotation of the compound motion rod, the rotational motion of the compound motion rod is transmitted to the moving rod, which easily causes wear of the compound motion rod and / or the moving rod.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The purpose of this application is to provide a shaft assembly and an electric valve capable of reducing wear of the compound motion assembly and / or the shaft rod assembly.

Means for Solving the Problems

[0005] According to one aspect, in an embodiment of the present application, there is provided a shaft assembly including a compound motion assembly, a shaft rod assembly, and a bearing assembly. The compound motion assembly is rotatable and movable about its own axis. The shaft rod assembly is movable by the drive of the compound motion assembly. The shaft rod assembly includes a shaft rod including a bottom wall portion and a shaft sleeve connected to the shaft rod. Along the axial direction of the shaft assembly, a part of the compound motion assembly is provided between the shaft sleeve and the bottom wall portion. Along the axial direction of the shaft assembly, a bearing assembly capable of abutting against the shaft sleeve and the compound motion assembly is provided between the shaft sleeve and the compound motion assembly, and / or along the axial direction of the shaft assembly, a bearing assembly capable of abutting against the bottom wall portion and the compound motion assembly is provided between the bottom wall portion and the compound motion assembly. The bearing assembly is arranged along the circumferential direction of the compound motion assembly and includes a plurality of rolling elements that are rotatable by the action of the compound motion assembly, and a shaft assembly is provided.

[0006] According to another aspect, in an embodiment of the present application, there is provided an electric valve having a valve port and a valve chamber, including a housing, a cover assembly, and the above-described shaft assembly. The cover assembly and the housing are sealingly connected. The shaft rod of the shaft assembly is movable in a direction approaching or separating from the valve port. The housing and the cover assembly form at least a part of the wall of the valve chamber. A part of the shaft rod is located in the valve chamber through the cover assembly, and an electric valve is provided.

[0007] According to the shaft assembly according to the embodiment of the present application, the shaft assembly includes a compound motion assembly, a shaft rod assembly, and a bearing member. Since the compound motion assembly is rotatable and can drive the shaft rod to move, in order to reduce the frictional force between the compound motion assembly and the shaft rod assembly, in the embodiment of the present application, along the axial direction of the shaft assembly, between the shaft sleeve and the compound motion assembly, a bearing assembly capable of abutting against the shaft sleeve and the compound motion assembly is provided, and / or along the axial direction of the shaft assembly, between the bottom wall portion and the compound motion assembly, a bearing assembly capable of abutting against the bottom wall portion and the compound motion assembly is provided. Therefore, the shaft sleeve and / or the shaft rod and the compound motion assembly do not directly contact each other, and the motion between the shaft sleeve and / or the shaft rod and the compound motion assembly is transmitted through the bearing assembly. Further, since the bearing assembly includes a plurality of rolling elements arranged along the circumferential direction of the compound motion assembly and rotatable by the action of the compound motion assembly, compared with the sliding frictional force caused by the direct contact between the compound motion assembly and the bearing assembly, in the embodiment of the present application, by making the rotational frictional force caused by the rotational motion of the rolling elements smaller than the sliding frictional force caused by the direct contact between the compound motion assembly and the bearing assembly, the frictional force applied to the compound motion assembly and / or the shaft rod assembly is reduced, which contributes to reducing the wear of the compound motion assembly and / or the shaft rod assembly.

[0008] According to the electric valve according to the embodiment of the present application, it includes a housing, a lid assembly, and the shaft assembly described above. By moving the shaft rod of the shaft assembly in a direction approaching or separating from the valve port, at least one of the operations of opening, closing, and flow rate adjustment by the valve port can be realized. In addition, a bearing assembly is provided in the shaft assembly of the electric valve. Since a plurality of rolling elements in the bearing assembly are arranged along the circumferential direction of the compound motion assembly and can rotate by the action of the compound motion assembly, in the embodiment of the present application, the rotational motion of the rolling elements contributes to reducing the wear of the compound motion assembly and / or the shaft rod assembly.

Brief Description of the Drawings

[0009]

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Embodiments for Carrying out the Invention

[0010] The features of various aspects of the present application and exemplary embodiments will be described below. To make the object, technical means, and advantages of the present application clearer, the present application will be further described below with reference to the accompanying drawings and specific embodiments. In this specification, relational terms such as "first" and "second" are used only to distinguish one component from another with the same name, and do not necessarily require or imply the existence of such an actual relationship or order between these components.

[0011] As shown in FIGS. 1 to 3, in an embodiment of the present application, an electric valve 1 is provided that is applicable to a fluid medium pipeline system for performing on, off, or fluid flow rate adjustment, and optionally applicable to an air conditioning system, an engine cooling system, a battery cooling system, or a fuel supply system.

[0012] The electric valve 1 has a valve port FK1, a valve chamber FK2, a first passage TH1 and a second passage TH2 that can communicate with each other via the valve port FK1. The electric valve 1 includes a housing 51, a lid assembly 60, a shaft assembly 100, and a piston 24. The lid assembly 60 and the housing 51 are sealingly connected. For example, a sealing ring is provided between the lid assembly 60 and the housing 51, and by tightening the sealing ring, sealing between the lid assembly 60 and the housing 51 can be achieved. The lid assembly 60 and the housing 51 form at least a part of the wall of the valve chamber FK2. The shaft assembly 100 includes a shaft rod 20. The shaft rod 20 has a main body portion 25 located on one side of the shaft rod 20. The piston 24 is connected to the main body portion 25 of the shaft rod 20. A part of the shaft rod 20 and the piston 24 are provided in the valve chamber FK2, and the shaft rod 20 drives the piston 24 to move in a direction approaching or separating from the valve port FK1. A part of the shaft rod 20 is provided in the valve chamber FK2 through the lid assembly 60, so that the lid assembly 60 can play a role in guiding and restricting the position of the shaft rod 20. Since the shaft rod 20 can drive the piston 24 to move in a direction approaching or separating from the valve port FK1, the first passage TH1 and the second passage TH2 can be turned on and off, and thereby, the electric valve of the embodiment of the present application can be used to turn on, turn off, or adjust the fluid flow rate.

[0013] In order to stably move the shaft rod 20 in the shaft assembly 100 along a straight line and improve the service life of the shaft assembly 100, as shown in FIGS. 4 to 6, in the embodiment of the present application, it is applied to the electric valve 1 shown in FIGS. 1 to 3, and thereby, a shaft assembly 100 that can improve the service life of the electric valve 1 is further provided.

[0014] As shown in FIGS. 3 to 6, the shaft assembly 100 has a first accommodation chamber 101. The shaft assembly 100 includes a compound motion assembly 10, a shaft rod assembly 201, and a bearing assembly 40. A part of the compound motion assembly 10 and the bearing assembly 40 are located in the first accommodation chamber 101, and the compound motion assembly 10 is rotatable and movable along its own axis. When specifically implemented, the compound motion assembly 10 is movable in a direction parallel or overlapping with its own axial direction, or movable in a direction forming a certain angle with its own axial direction. For example, in FIGS. 1 to 3, the electric valve 1 may further include a nut assembly 82 capable of converting the rotational motion of the compound motion assembly 10 into the translational motion of the compound motion assembly 10. The shaft rod assembly 201 is movable by the drive of the compound motion assembly 10. For example, since the shaft rod assembly 201 is movable along its own axis by the drive of the compound motion assembly 10, the axis of the compound motion assembly 10 is parallel or overlaps with the axis of the shaft rod assembly 201.

[0015] The shaft rod assembly 201 includes a shaft rod 20 and a shaft sleeve 30 connected to one end of the shaft rod 20. For example, as shown in FIG. 6, a part of the shaft sleeve 30 is fitted inside the shaft rod 20, directly contacts the shaft rod 20, and is fixed by laser welding. In some other embodiments, the shaft sleeve 30 may be indirectly connected to the shaft rod 20 via other members, whereby the shaft sleeve 30 moves synchronously with the shaft rod 20. The shaft rod 20 includes a side wall portion 21 and a bottom wall portion 22. The shaft sleeve 30, the side wall portion 21, and the bottom wall portion 22 form at least a part of the wall of the first accommodation chamber 101, and at least a part of the shaft sleeve 30 and at least a part of the bottom wall portion 22 are arranged along the axial direction of the shaft assembly 100. Along the axial direction of the shaft assembly 100, at least a part of the side wall portion 21 is provided between the shaft sleeve 30 and the bottom wall portion 22, and along the axial direction of the shaft assembly 100, a part of the compound motion assembly 10 is provided between the shaft sleeve 30 and the bottom wall portion 22 and is located inside the accommodation chamber 101.

[0016] When the compound motion assembly 10 rotates, it can be driven to move the shaft sleeve 30 and the shaft rod 20. The compound motion assembly 10 directly contacts the shaft sleeve 30 or the shaft rod 20, or contacts through other members. Due to the direct contact between the compound motion assembly 10 and the shaft sleeve 30 or the shaft rod 20, or the sliding friction force caused by the contact through other members is large, and the two members that generate the friction force are prone to wear.

[0017] To solve the above problems, in an embodiment of the present application, the bearing assembly 40 is located in the first accommodation chamber 101, and along the axial direction of the compound motion assembly 10, at least one bearing assembly 40 is provided between at least one of the shaft sleeve 30 and the bottom wall portion 22 and the compound motion assembly 10. At this time, along the axial direction of the shaft assembly 100, between the shaft sleeve 30 and the compound motion assembly 10, at least one bearing assembly 40 capable of abutting against the shaft sleeve 30 and the compound motion assembly 10 respectively is provided, and / or along the axial direction of the shaft assembly 100, between the bottom wall portion 22 and the compound motion assembly 10, at least one bearing assembly 40 capable of abutting against the bottom wall portion 22 and the compound motion assembly 10 is provided, so that the shaft sleeve 30 and / or the shaft rod 20 and the compound motion assembly 10 are not in direct contact, and the motion between the shaft sleeve 30 and / or the shaft rod 20 and the compound motion assembly 10 is transmitted through the bearing assembly 40.

[0018] Furthermore, as shown in FIGS. 6 to 9, the bearing assembly 40 includes a support assembly 41 including a support member 411 and a plurality of rolling elements 412. The support member 411 and the compound motion assembly 10 are fitted to each other. The plurality of rolling elements 412 are arranged along the circumferential direction of the compound motion assembly 10, and the plurality of rolling elements 412 are connected to the support member 411 in a position-limited manner and are rotatable by the action of the compound motion assembly 10. By providing as described above, when the compound motion assembly 10 rotates, the rolling elements 412 located between the compound motion assembly 10 and the shaft rod assembly 201 can be driven to rotate. By making the rotational frictional force caused by the rotational motion of the rolling elements 412 smaller than the sliding frictional force caused by the direct contact between the compound motion assembly 10 and the bearing assembly 40, it becomes easy to reduce the frictional force applied to the compound motion assembly 10 and / or the shaft rod assembly 201, contributing to reducing the wear of the compound motion assembly 10 and / or the shaft rod assembly 201. The rolling element 412 in this specification may be one of a ball and a needle or a combination thereof.

[0019] Further referring to FIGS. 4 to 9, in some embodiments, the bearing assembly 40 further includes a first ring portion 42 and a second ring portion 43. Along the axial direction of the bearing assembly 40, the support assembly 41 is provided between the first ring portion 42 and the second ring portion 43, both of which can be mutually fitted with the compound motion assembly 10. Along the radial direction of the bearing assembly 40, one of the first ring portion 42 and the second ring portion 43 is interference-fitted with the compound motion assembly 10, and there is a gap between the other and the compound motion assembly 10. In this specification, the example where the first ring portion 42 is interference-fitted with the compound motion assembly 10 and the second ring portion 43 has a gap with the compound motion assembly 10 is taken for explanation, and the axial direction of the bearing assembly 40, the axial direction of the compound motion assembly 10, and the axial direction of the shaft rod assembly 201 are parallel or overlapping. By providing as described above, the bearing assembly 40 can withstand axial loads. When the compound motion assembly 10 rotates, the first ring portion 42 can be driven to rotate, thereby rotating the rolling elements 412 in the support assembly 41. At this time, the second ring portion 43 does not rotate or rotates only by a small angle, so it is easy to reduce the frictional moment between the compound motion assembly 10, the bearing assembly 40, and the shaft rod assembly 201, contributing to reducing the wear of the compound motion assembly 10 and / or the shaft rod assembly 201.

[0020] To reduce the wear of the composite motion assembly 10, the shaft rod 20, and the composite motion assembly 10 and the shaft sleeve 30, in some embodiments, the bearing assembly 40 includes a first bearing assembly 40a provided between the shaft sleeve 30 and the composite motion assembly 10, and a second bearing assembly 40b provided between the composite motion assembly 10 and the bottom wall portion 22. Among them, the first bearing assembly 40a is a flat thrust ball bearing or a needle thrust bearing, and / or the second bearing assembly 40b is a flat thrust ball bearing or a needle thrust bearing. Specifically, when implementing, in order to reduce the structural dimensions of the shaft assembly 100, the first bearing assembly 40a and the second bearing assembly 40b may be the same and both may be flat thrust ball bearings. Here, when the first bearing assembly 40a and / or the second bearing assembly 40b is a needle thrust bearing, the needle thrust bearing may include a support assembly 41 and needles provided on the support assembly 41, and it is not necessary to provide the first ring portion 42 and the second ring portion 43 on this needle thrust bearing. The needles used as the rolling elements 412 can not only rotate but also withstand axial loads. Alternatively, in other embodiments, at least one of the first ring portion 42 and the second ring portion 43 may be provided on the needle thrust bearing, but this is not limited in the present application.

[0021] Furthermore, as shown in FIGS. 5 and 6, in some embodiments, the compound motion assembly 10 includes a first rod assembly 11, an elastic member 12, and a second rod 13. The first rod assembly 11 and the second rod 13 are provided separately and arranged along the axial direction of the compound motion assembly 10. A part of the elastic member 12 is fitted into the first rod assembly 11, and another part is fitted into the second rod 13. When the first rod assembly 11 is rotated, the rotational force is transmitted to the second rod 13 through the elastic member 12, so that the second rod 13 also rotates. By providing as described above, it is effective to move the shaft rod assembly 201 in a direction approaching or separating from the valve port during the rotation of the compound operation assembly 10. Among them, a part of the first rod assembly 11 is located in the first accommodation chamber 101 through the through hole of the shaft sleeve 30. The second rod 13 is closer to the bottom wall portion 22 than the first rod assembly 11. The first bearing assembly 40a and the first rod assembly 11 are fitted into each other, and the second bearing assembly 40b and the second rod 13 are fitted into each other. Along the axial direction of the compound motion assembly 10, the elastic member 12 is provided between the first bearing assembly 40a and the second bearing assembly 40b. Specifically, when implemented, the elastic member 12 may be a spring. The first bearing assembly 40a is fitted on the outer peripheral side of a part of the first rod assembly 11, and the second bearing assembly 40b is fitted on the outer peripheral side of a part of the second rod 13. Both the first bearing assembly 40a and the second bearing assembly 40b include a support assembly 41, a first ring portion 42, and a second ring portion 43. As shown in FIG. 6, the compound motion assembly 10 can move the shaft rod assembly 201 along the left and right directions in FIG. 6. By providing as described above, when the compound motion assembly 10 is moved to the right, the wear between the compound motion assembly 10 and the bottom wall portion 22 is reduced. On the other hand, when the compound motion assembly 10 is moved to the left, the wear between the compound motion assembly 10 and the shaft sleeve 30 can be reduced.

[0022] Referring further to FIG. 6, in some embodiments, the first rod assembly 11 includes a flange member 111 and a first rod 112, where the flange member 111 is connected to the first rod 112. Optionally, the flange member 111 may be integrated with the first rod 112, or the flange member 111 and the first rod 112 may be arranged separately and fastened and / or fixed by welding. Along the axial direction of the compound motion assembly 10, a first bearing assembly 40a is provided between the flange member 111 and the shaft sleeve 30. The second rod 13 includes a first shaft portion 131 and a second shaft portion 132. When projected in the axial direction of the second rod 13, at least a part of the orthographic projection of the first shaft portion 131 is within the orthographic projection range of the second shaft portion 132, and at this time, the diameter of the first shaft portion 131 is smaller than that of the second shaft portion 132. The second bearing assembly 40b and the first shaft portion 131 can be mutually fitted. Along the axial direction of the second rod 13, a second bearing assembly 40b is provided between the second shaft portion 132 and the bottom wall portion 22, and an elastic member 12 is provided between the flange member 111 and the second bearing assembly 40b. There is a gap between the first shaft portion 131 and the bottom wall portion 22 along the axial direction of the compound motion assembly 10. By providing as described above, it becomes easy to limit the axial positions of the first bearing assembly 40 and the second bearing assembly 40b.

[0023] In order to rationally set the positions of the first bearing assembly 40a and the second bearing assembly 40b to reduce the wear between the composite motion assembly 10 and the shaft rod assembly 201, in some embodiments, in the first bearing assembly 40a, along the axial direction of the first bearing assembly 40a, a second ring portion 43 is provided between the first ring portion 42 and the shaft sleeve 30. The first ring portion 42 is fitted on the outer peripheral side of the first rod 112 and is interference-fitted with the first rod 112, and the first ring portion 42 can abut against the flange member 111. Along the radial direction of the first rod 112, there is a gap between the second ring portion 43 and the first rod 112, and the second ring portion 43 can abut against the shaft sleeve 30. At this time, the first ring portion 42 is the inner ring and the second ring portion 43 is the outer ring. In FIG. 6, when the composite motion assembly 10 moves leftward while rotating, the composite motion assembly 10 drives the first ring portion 42 to rotate, thereby driving the rolling elements 412 to rotate. When the second ring portion 43 abuts against the shaft sleeve 30, the shaft sleeve 30 and the shaft rod 20 can be driven to move leftward. At this time, the second ring portion 43 does not rotate or rotates only by a small angle, so almost no sliding frictional force is generated between the second ring portion 43 and the shaft sleeve 30, which is conducive to reducing the frictional moment between the second ring portion 43 and the shaft sleeve 30 and contributes to reducing the wear of the shaft sleeve 30.

[0024] And / or, in the second bearing assembly 40b, a second ring portion 43 is provided between the first ring portion 42 and the bottom wall portion 22, the first ring portion 42 and the first shaft portion 131 are interference-fitted, and the first ring portion 42 can abut against the second shaft portion 132. Along the radial direction of the second rod 13, there is a gap between the second ring portion 43 and the first shaft portion 131, and the outer wall surface of the second ring portion 43 can be fitted to the inner surface of the side wall portion 21 by interference fit. Therefore, it is easy to limit the axial position of the second ring portion 43, and the second ring portion 43 can abut against the bottom wall portion 22. At this time, the first ring portion 42 is the inner ring. When the second ring portion 43 abuts against the bottom wall portion 22, the shaft rod 20 can be moved to the right direction. At this time, the second ring portion 43 is the outer ring. In FIG. 6, when the compound motion unit 10 moves to the right while rotating, the compound motion unit 10 can drive the first ring portion 42 to rotate, thereby rotating the rotor 412. At this time, the second ring portion 43 does not rotate or rotates only by a small angle. Therefore, almost no sliding frictional force is generated between the second ring portion 43 and the bottom wall portion 22, so it is easy to reduce the frictional moment between the second ring portion 43 and the bottom wall portion 22, reduce the wear of the bottom wall portion 22, and further contribute to reducing the wear of the shaft rod 20.

[0025] As shown in FIGS. 6 and 7, in order to more effectively position-limit the first ring portion 42 and the second ring portion 43 in the first bearing assembly 40a, in some embodiments, the first rod 112 includes a third shaft portion 1121, a fourth shaft portion 1122, a fifth shaft portion 1123, and a sixth shaft portion 1124 that are sequentially arranged along the axial direction of the first rod 112. When projected in the axial direction of the first rod 112, at least a part of the orthographic projection of the third shaft portion 1121 is within the orthographic projection range of the fourth shaft portion 1122, at least a part of the orthographic projection of the fourth shaft portion 1122 is within the orthographic projection range of the fifth shaft portion 1123, and at least a part of the orthographic projection of the fifth shaft portion 1123 is within the orthographic projection range of the sixth shaft portion 1124. At this time, the diameter of the third shaft portion 1121 is smaller than the diameter of the fourth shaft portion 1122, the diameter of the fourth shaft portion 1122 is smaller than the diameter of the fifth shaft portion 1123, and the diameter of the fifth shaft portion 1123 is smaller than the diameter of the sixth shaft portion 1124. A first shaft shoulder is formed between the third shaft portion 1121 and the fourth shaft portion 1122, a second shaft shoulder is formed between the fourth shaft portion 1122 and the fifth shaft portion 1123, and a third shaft shoulder is formed between the fifth shaft portion 1123 and the sixth shaft portion 1124. By installing the shaft shoulder structure in this way, it becomes easier to position-limit the support assembly 41, the first ring portion 41, and the second ring portion 43.

[0026] Based on this, the flange member 111 is fitted on the outer surface side of the third shaft portion 1121 and abuts against the first shaft shoulder. In the first bearing assembly 40a, the first ring portion 42 is fitted on the outer peripheral side of the fourth shaft portion 1122 and is press-fitted with the fourth shaft portion 1122, and the first ring portion 42 abuts against the second shaft shoulder. Both the support assembly 41 and the second ring portion 43 are fitted on the outer peripheral side of the fifth shaft portion 1123. At this time, the rolling elements 412 are arranged around the outer peripheral side of the fifth shaft portion 1123, and the second ring portion 43 abuts against the third shaft shoulder. Along the radial direction of the first rod 112, there is a gap between the second ring portion 43 and the fifth shaft portion 1123, and the shaft sleeve 30 is fitted on the outer peripheral side of the sixth shaft portion 1124. By providing the first shaft shoulder, the axial position of the flange member 111 can be restricted, and the assembly of the flange member 111 becomes easy. Also, by providing the second shaft shoulder, the axial position of the first ring portion 42 of the first bearing assembly 40a can be restricted, and it is possible to prevent crimping to the second ring portion 43, and to make the second ring portion 43 hardly rotate. Also, by providing the third shaft shoulder, as shown in FIG. 6, when the composite motion assembly 10 is moved rightward, the axial position of the second ring portion 43 is restricted to prevent separation of the second ring portion 43, the support assembly 41, and the first ring portion 42 in the first bearing assembly 40a.

[0027] As shown in FIGS. 10 and 11, in order to reduce the rotation of the shaft rod 20, in some embodiments, the shaft rod 20 further includes a through hole 23. Along the axial direction of the shaft rod 20, the hole wall of the through hole 23 is located on the side away from the shaft sleeve 30 of the bottom wall portion 22, and at this time, the through hole 23 is provided between the bottom wall portion 22 and the main body portion 25. By providing the through hole 23, when applying the shaft assembly 100 shown in FIGS. 1 to 3 to an electric pump or other components, a detent pin can be arranged in the through hole 23, and by fitting the detent pin with a detent groove in the electric pump or other components, the rotation of the shaft rod 20 can be reduced or the rotation of the shaft rod 20 can be prevented.

[0028] Based on the realizable forms as described above, by applying the shaft assembly 100 in FIGS. 4 to 11 to the electric valve 1, it becomes easy to improve the service life of the electric valve 1 and contributes to reducing the driving force. The configuration of the electric valve 1 will be further described below.

[0029] As shown in FIGS. 1 to 3 and FIGS. 12 to 15, in some embodiments, the electric valve 1 further includes an end cap 52, a stator assembly 83, a rotor assembly 84, and a connector 89. The end cap 52 and the housing 51 are sealingly connected by a welding process. The lid assembly 60 is located inside the housing 51. The stator assembly 83 and the rotor assembly 84 are located in the space defined by the end cap 52 and the housing 51. The stator assembly 83 includes a coil. When the coil is energized and in an operating state, the rotor assembly 84 is placed within the magnetic field range of the coil, so that the rotor assembly 84 can be rotated by driving the coil. Also, since the composite motion assembly 10 in the shaft assembly 100 is connected to the rotor assembly 84 via the connector 89, the composite motion assembly 10 can be rotated by driving the rotor assembly 84. Optionally, the composite motion assembly 10 and the connecting member 89 can be welded or fitted by an interference fit. In order to protect the coil in the stator assembly 83 and prevent damage to the coil by fluid, in some embodiments, the electric valve 1 further includes an isolation sleeve 88. The isolation sleeve 88 is fitted on the outer peripheral side of a part of the rotor assembly 84, and the isolation sleeve 88 and the lid assembly 60 are sealed by a welding process, so that the accommodation chamber of the stator assembly 83 and the accommodation chamber of the rotor assembly 84 can be isolated from each other.

[0030] To convert the rotational motion of the composite motion assembly 10 into linear motion, in some embodiments, the electric valve may further include a nut assembly 82, at least a part of the nut assembly 82 is located on the side away from the valve port FK1 of the cover assembly 60, a part of the nut assembly 82 is fitted on the outer peripheral side of a part of the first rod 112, is located on the inner peripheral side of a part of the rotor assembly 84, and the nut assembly 82 is screwed onto the first rod 112. To limit the position of the nut assembly 82, in some embodiments, a part of the nut assembly 82 may be fitted inside the cover assembly 60, and the nut assembly 82 and the cover assembly 60 may be joined by welding.

[0031] Furthermore, as shown in FIGS. 12 to 16, to limit the rotational position of the composite motion assembly 10, in some embodiments, the electric valve 1 further includes a detent rod 85, a spring rail 86, and a slip ring 87. A part of the spring rail 86 is fitted on the outer peripheral side of a part of the nut assembly 82. Along the axial direction of the composite motion assembly 10, the spring rail 86 is provided between the connector 89 and the cover assembly 60, and one end of the spring rail 86 is provided so as to be position-limitable with respect to the nut assembly 82, so that the spring rail 86 can be prevented from moving along the axial direction of the composite motion assembly 10. Also, the slip ring 87 is coiled and fitted into the gap of the screw ring of the spring rail 86. The detent rod 85 is connected to the connector 89 so as to be position-limitable, and the detent rod 85 extends in the direction of the nut assembly 82. When the composite motion assembly 10 rotates, linear movement can be realized by the nut assembly 82, and the slip ring 87 can be spirally moved around the central axis of the nut assembly 82 along the spiral orbit of the spring guide 86. When the slip ring 87 abuts against the detent rod 85 or the nut assembly 83, the axial position of the composite motion assembly 10 can be limited.

[0032] Further referring to FIGS. 12 to 15, in some embodiments, the lid assembly 60 includes a second accommodation chamber 61, a mounting hole 62, and a position limiting hole 63. The mounting hole 62 and the position limiting hole 63 are provided on both axial sides of the lid assembly 60 and communicate with each other through the second accommodation chamber 61. A part of the shaft rod 20 is fitted inside the hole portion where the position limiting hole 63 is provided, so that the lid assembly 60 can limit the position of the shaft rod 20 and guide the axial movement of the shaft rod 20. To prevent the rotation of the shaft rod 20, the shaft rod 20 of the shaft assembly 100 is provided with a through hole 23. The electric valve 1 is provided in the second accommodation chamber 61 and further includes a rotation preventing pin 81 that is drilled in the through hole 23 and is provided so as to be positionally limited with the lid assembly 60. The hole diameter of at least a part of the mounting hole 62 is equal to or greater than the axial length of the rotation preventing pin 81, and the hole diameter of the position limiting hole 63 is less than the axial length of the rotation preventing pin 81. By providing as described above, when attaching the rotation preventing pin 81, it can be attached from the mounting hole 62 to the second accommodation chamber 61. Therefore, the hole diameter of the position limiting hole 63 can be made smaller compared to the case of attaching the rotation preventing pin 81 from the position limiting hole 63 side. To prevent the rotation of the rotation preventing pin 81, the lid assembly 60 has a position limiting groove 64 including a position limiting surface that extends in the axial direction of the lid assembly 60 and is arranged along the circumferential direction of the lid assembly 60. Both axial ends of the rotation preventing pin 81 are located within the position limiting groove 64, so that the position of the rotation preventing pin 81 can be limited using the position limiting surface, and the rotation of the rotation preventing pin 81 can be reduced or prevented.

[0033] Since the nut assembly 82 is provided so as to be weldable to the lid assembly 60, for the convenience of welding, the lid assembly 60 includes a first lid portion 601 and a second lid portion 602. The constituent materials of the first lid portion 601 and the second lid portion 602 may be made different. For example, the constituent material of the first lid portion 601 may be metal, and the constituent material of the second lid portion 602 may be plastic. The first lid portion 601 is connected to the second lid portion 602 so as to be injection-moldable as an insert, and a part of the first lid portion 601 protrudes outside the second lid portion 602, so that welding between the first lid portion 601 and the nut assembly 82 can be facilitated. For example, in FIGS. 3 and 13, along the axial direction of the shaft rod 20, a part of the first lid portion 601 protrudes from the axial end face of the second lid portion 602, so that welding between the first lid portion 601 and the nut assembly 82 can be facilitated.

[0034] Furthermore, in order to reduce or prevent fluid from flowing from the valve chamber FK2 into the accommodation chamber of the rotor assembly 84, as shown in FIGS. 1 to 3 and 13, the electric valve 1 in the embodiment of the present application further includes a diaphragm seal 70 fitted on the outer peripheral side of a part of the shaft rod 20. The diaphragm seal 70 includes a first portion 71, a second portion 72, and a third portion 73. The first portion 71, the second portion 72, and the third portion 73 are all annular structures. The first portion 71 and the third portion 73 are connected via the second portion 72. The first portion 71 is fitted on the outer surface side of a part of the shaft rod 20 and is sealingly connected to the shaft rod 20. The third portion 73 is provided between the housing 51 and the lid assembly 60. The second portion 72 is deformable as the shaft rod 20 moves. By providing as described above, a good seal can be realized using the diaphragm seal 70.

[0035] Since the anti-rotation pin 81 is attached from the direction of the mounting hole 62, the diameter of the position-limiting hole 63 can be reduced. Further, as shown in FIGS. 13 to 15, in some embodiments, the lid assembly 60 has a first surface S1 and a second surface S2. Along the radial direction of the lid assembly 60, the second surface S2 is located inside the first surface S1, the first surface S1 abuts against the third portion 73, and along the axial direction of the lid assembly 60, the second surface S2 is closer to the second portion 72 of the diaphragm seal 70 than the first surface S1. Here, the position-limiting hole 63 is located on the second surface S2, and since the diameter of the position-limiting hole 63 is small, the area of the second surface S2 becomes large. When pressure is applied to the diaphragm seal 70 by the fluid in the electric valve 1, at least a part of the second portion 72 comes into close contact with the second surface S2 and reciprocates due to the action of the pressure. When the anti-rotation pin is attached from the side of the position-limiting hole, it is necessary to provide a chamfered structure with a large diameter of the position-limiting hole and extending toward the second accommodation chamber side. Therefore, compared with the case where the second portion is likely to be excessively stretched, the area of the second surface S2 in the embodiment of the present application is large and closer to the second portion 72 of the diaphragm seal 70. Therefore, the electric valve in the embodiment of the present application can reduce or eliminate the excessive stretching of the diaphragm seal 70, improve the service life of the diaphragm seal 70, and thereby improve the service life of the electric valve.

[0036] Here, it should be understood that the housing 51 of the embodiment of the present application may be a single structure, for example, an integrally molded injection-molded body, or a structure in which a plurality of components are sealed and arranged. The shaft assembly 100 in the embodiment of the present application is applicable not only to the above-described electric valve 1 but also to other components including a composite motion assembly and a shaft rod assembly.

[0037] As described above, according to the shaft assembly 100 and the electric valve 1 according to the embodiment of the present application, the shaft assembly 100 includes a composite motion assembly 10, a shaft rod assembly 201, and a bearing assembly 40. A part of the wall of the first accommodation chamber 101 is formed by the shaft sleeve 30 and the bottom wall portion 22 in the shaft rod assembly 201. A part of the composite motion assembly 10 and the bearing assembly 40 are located in the first accommodation chamber. The composite motion assembly 10 is rotatable and can drive the shaft rod assembly 201 to move. Therefore, in the embodiment of the present application, in order to reduce the wear between the composite motion assembly 10 and the shaft rod assembly 201, at least one bearing assembly 40 is provided between at least one of the shaft sleeve 30 and the bottom wall portion 22 and the composite motion assembly 10 along the axial direction of the composite motion assembly 10. A plurality of rolling elements 412 in the bearing assembly 40 are arranged along the circumferential direction of the composite motion assembly 10 and are rotatable by the action of the composite motion assembly 10. Therefore, compared with the sliding friction force caused by the direct contact between the composite motion assembly and the bearing assembly, in the embodiment of the present application, the friction force applied to the composite motion assembly 10 and / or the shaft rod assembly 201 by the rotational motion of the rolling elements 412 is reduced, and the wear of the composite motion assembly 10 and / or the shaft rod assembly 201 can be reduced. When the shaft assembly 100 is applied to the electric valve 1, the service life of the electric valve 1 can be improved.

[0038] It should be noted that the above embodiments are only used to explain the present application, but it should be noted that they do not limit the technical methods described in the present application. For example, regarding the definitions of directions such as "front", "rear", "left", "right", "up", and "down", although the present application has been described with reference to the above embodiments in this specification, those skilled in the art should understand that the present application can be modified, combined, or equivalently replaced. Also, all technical methods and their improvements that do not depart from the spirit and scope of the present application should be included within the scope of the claims of the present application.

Claims

1. A shaft assembly (100) comprising a compound motion assembly (10), a shaft rod assembly (201), and a bearing assembly (40), wherein the compound motion assembly (10) is rotatable and movable about its own axis, the shaft rod assembly (201) is movable by the drive of the compound motion assembly (10), the shaft rod assembly (201) comprises a shaft rod (20) including a bottom wall portion (22) and a shaft sleeve (30) connected to the shaft rod (20), and along the axial direction of the shaft assembly (100), a part of the compound motion assembly (10) is provided between the shaft sleeve (30) and the bottom wall portion (22), Along the axial direction of the shaft assembly (100), a bearing assembly (40) capable of abutting against the shaft sleeve (30) and the compound motion assembly (10) is provided between the shaft sleeve (30) and the compound motion assembly (10), and / or along the axial direction of the shaft assembly (100), a bearing assembly (40) capable of abutting against the bottom wall portion (22) and the compound motion assembly (10) is provided between the bottom wall portion (22) and the compound motion assembly (10), The bearing assembly (40) is arranged along the circumferential direction of the compound motion assembly (10) and comprises a plurality of rolling elements (412) that are rotatable by the action of the compound motion assembly (10). The shaft assembly (100) is characterized by this.

2. The bearing assembly (40) further comprises a first ring portion (42) and a second ring portion (43). Along the axial direction of the bearing assembly (40), the rolling elements (412) are both provided between the first ring portion (42) and the second ring portion (43) that can be mutually fitted with the compound motion assembly (10). One of the first ring portion (42) and the second ring portion (43) is interference-fitted with the compound motion assembly (10), and the other has a gap with the compound motion assembly (10). The shaft assembly (100) according to Claim 1 is characterized by this.

3. The bearing assembly (40) includes a first bearing assembly (40a) and a second bearing assembly (40b). Along the axial direction of the shaft assembly (100), the first bearing assembly (40a) is provided between the shaft sleeve (30) and the compound motion assembly (10), and the second bearing assembly (40b) is provided between the compound motion assembly (10) and the bottom wall portion (22). The shaft assembly (100) according to claim 2, characterized in that.

4. The compound motion assembly (10) includes a first rod assembly (11), an elastic member (12), and a second rod (13). The first rod assembly (11) and the second rod (13) are provided separately and are arranged along the axial direction of the compound motion assembly (10). A part of the elastic member (12) can be mutually fitted with the first rod assembly (11), and another part can be mutually fitted with the second rod (13). The first bearing assembly (40a) and the first rod assembly (11) can be mutually fitted. The second bearing assembly (40b) and the second rod (13) can be mutually fitted. Along the axial direction of the shaft assembly (100), the elastic member (12) is provided between the first bearing assembly (40a) and the second bearing assembly (40b). The shaft assembly (100) according to claim 3, characterized in that.

5. The first rod assembly (11) includes a flange member (111) and a first rod (112). The flange member (111) is connected to the first rod (112). Along the axial direction of the shaft assembly (100), the first bearing assembly (40a) is provided between the flange member (111) and the shaft sleeve (30). The elastic member (12) is provided between the flange member (111) and the second bearing assembly (40b). The shaft assembly (100) according to claim 4, characterized in that.

6. In the first bearing assembly (40a), the second ring portion (43) is provided between the first ring portion (42) and the shaft sleeve (30), the first ring portion (42) is interference-fitted with the first rod (112) and can abut against the flange member (111), there is a gap between the second ring portion (43) and the first rod (112) along the radial direction of the first rod (112), and the second ring portion (43) can abut against the shaft sleeve (112). The shaft assembly (100) according to claim 5, characterized in that.

7. The second rod (13) includes a first shaft portion (131) and a second shaft portion (132). When projected in the axial direction of the second rod (13), at least a part of the orthographic projection of the first shaft portion (131) is within the orthographic projection range of the second shaft portion (132), the second bearing assembly (40b) and the first shaft portion (131) can be mutually fitted, and along the axial direction of the second rod (13), the second bearing assembly (40b) is provided between the second shaft portion (132) and the bottom wall portion (22). The shaft assembly (100) according to claim 4, characterized in that.

8. In the second bearing assembly (40b), the second ring portion (43) is provided between the first ring portion (42) and the bottom wall portion (22), the first ring portion (42) is interference-fitted with the first shaft portion (131) and can abut against the second shaft portion (132), there is a gap between the second ring portion (43) and the first shaft portion (131) along the radial direction of the second rod (13), and the second ring portion (43) can abut against the bottom wall portion (22). The shaft assembly (100) according to claim 7, characterized in that.

9. The first rod (112) includes a third shaft portion (1121), a fourth shaft portion (1122), a fifth shaft portion (1123), and a sixth shaft portion (1124) that are sequentially arranged along the axial direction of the first rod (112). When projected in the axial direction of the first rod (112), at least a part of the orthographic projection of the third shaft portion (1121) is within the orthographic projection range of the fourth shaft portion (1122), at least a part of the orthographic projection of the fourth shaft portion (1122) is within the orthographic projection range of the fifth shaft portion (1123), and at least a part of the orthographic projection of the fifth shaft portion (1123) is within the orthographic projection range of the sixth shaft portion (1124). The shaft assembly (100) according to any one of claims 5 to 8, characterized in that.

10. The first rod assembly (11) includes a flange member (111) fitted on the outer surface side of the third shaft portion (1121). In the first bearing assembly (40a), the first ring portion (42) is fitted on the outer peripheral side of the fourth shaft portion (1122) and is interference-fitted with the fourth shaft portion (1122). The second ring portion (43) is fitted on the outer peripheral side of the fifth shaft portion (1123), and the rolling elements (412) are arranged around the outer peripheral side of the fifth shaft portion (1123). Along the radial direction of the first rod (112), there is a gap between the second ring portion (43) and the fifth shaft portion (1123). The shaft sleeve (30) is fitted on the outer peripheral side of the sixth shaft portion (1124). The shaft assembly (100) according to claim 9, characterized in that.

11. The first bearing assembly (40a) is a flat thrust ball bearing or a needle thrust bearing, and / or, The second bearing assembly (40b) is a flat thrust ball bearing or a needle thrust bearing. The shaft assembly (100) according to any one of claims 3 to 8, characterized in that.

12. The shaft rod (20) further includes a through hole (23). Along the axial direction of the shaft rod (20), the hole wall of the through hole (23) is located on the side away from the shaft sleeve (30) of the bottom wall portion (22). The shaft assembly (100) according to any one of claims 1 to 8, characterized in that.

13. An electric valve (1) having a valve port (FK1) and a valve chamber (FK2), A housing (51), a lid assembly (60), and a shaft assembly (100) according to any one of claims 1 to 12, wherein the lid assembly (60) and the housing (51) are sealingly connected, and a shaft rod (20) of the shaft assembly (100) is movable in a direction approaching or separating from the valve port (FK1), and the housing (51) and the lid assembly (60) form at least a part of a wall of the valve chamber (FK2), and a part of the shaft rod (20) is located in the valve chamber (FK2) through the lid assembly (60). An electric valve (1) characterized by this.

14. The electric valve (1) further includes a diaphragm seal (70) including a first part (71), a second part (72), and a third part (73), and the first part (71) and the third part (73) are connected via the second part (72), and the first part (71) is fitted on an outer surface side of a part of the shaft rod (20) and is sealingly connected to the shaft rod (20), and the third part (73) is interposed between the housing (51) and the lid assembly (60). The lid assembly (60) has a first surface (S1) and a second surface (S2), and along the radial direction of the lid assembly (60), the second surface (S2) is located inside the first surface (S1), and the first surface (S1) abuts against the third part (73), and along the axial direction of the lid assembly (60), the second surface (S2) is closer to the second part (72) than the first surface (S1). The electric valve (1) according to claim 13, characterized by this.

15. The lid assembly (60) includes a second accommodation chamber (61), a mounting hole (62), and a position limiting hole (63), and the mounting hole (62) and the position limiting hole (63) are provided on both axial sides of the lid assembly (60) and communicate with each other through the second accommodation chamber (61), and a part of the shaft rod (20) is fitted inside a hole portion where the position limiting hole (63) is provided. The shaft assembly (100) includes a shaft rod (20) having a through hole (23), and the electric valve (1) is provided with a rotation prevention pin (81) that is formed in the through hole (23) and is provided so as to be positionally restricted with the lid body assembly (60). At least a part of the hole diameter of the mounting hole (62) is equal to or greater than the axial length of the rotation prevention pin (81), and the hole diameter of the position restricting hole (63) is less than the axial length of the rotation prevention pin (81). The electric valve (1) according to claim 14, characterized in that.

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