Spindle assembly and electronic expansion valve having the same

Abstract

A spindle assembly including a spindle body (10), a bushing (20), a sealing portion (30), and a restriction structure, wherein the spindle body (10) has a flow rate regulating end, which is used to engage with a valve port (003) of an electronic expansion valve to regulate the flow rate at the valve port (003), and the bushing (20) is fitted to the spindle body (10) and has a first end and a second end opposite to each other, the second end of the bushing (20) being adjacent to the flow rate regulating end, and the flow rate regulating end protruding from an end of the second end of the bushing (20). a sealing portion (30) fitted around the outer periphery of the spindle body (10) and having opposite connecting and sealing ends, the connecting end being located between the bushing (20) and the spindle body (10), the sealing end being located outside the bushing (20) and adjacent to the flow regulating end, the sealing end being used to sealingly engage with the valve port (003), and the restricting structure being used to fix the position of the sealing portion (30) relative to the bushing (20) and the spindle body (10). This spindle assembly and an electronic expansion valve having the same solve the problem in the prior art of not being able to ensure the machining efficiency and machining accuracy of the spindle, which is caused by providing a barb structure on the spindle.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on December 30, 2022, bearing application number 202211733577.4 and entitled "Spindle assembly and electronic expansion valve having the same."

[0002] This application claims priority to a patent application filed with the State Intellectual Property Office of China on December 30, 2022, bearing application number 202223603019.4 and entitled "Spindle assembly and electronic expansion valve having the same."

[0003] The present application relates to the technical field of valves, and more particularly to a spindle assembly and an electronic expansion valve having the same. [Background technology]

[0004] Electronic expansion valves used in low-temperature heat pump systems typically require both low internal leakage and accurate flow rate control. Currently, a typical approach is to provide a sealing ring on the outer periphery of the spindle, which engages the spindle with the valve port to adjust the flow rate and achieve low internal leakage. As shown in Figure 1, in the prior art, the spindle 001 and the sealing ring 002 are typically secured relative to each other by providing a barb structure on the periphery of the spindle 001. However, providing a barb structure on the outer periphery of the spindle makes it difficult to ensure the machining efficiency and accuracy of the spindle. Summary of the Invention

[0005] The present application provides a spindle assembly and an electronic expansion valve having the same to solve the problem in the prior art of not being able to ensure the machining efficiency and machining accuracy of the spindle due to the provision of a barb structure on the spindle.

[0006] According to one aspect of the present application, there is provided a spindle assembly including a spindle body, a bushing, a sealing portion, and a restriction structure, wherein the spindle body has a flow rate regulating end that is used to engage with a valve port of an electronic expansion valve to regulate the flow rate at the valve port, the bushing is fitted to the spindle body and has a first end and a second end that are oppositely arranged, the second end of the bushing is located adjacent to the flow rate regulating end and the flow rate regulating end is located protruding from an end of the second end of the bushing, the sealing portion is fitted to the outer periphery of the spindle body and has a connecting end and a sealing end that are oppositely arranged, the connecting end is located between the bushing and the spindle body, the sealing end is located outside the bushing and is located adjacent to the flow rate regulating end, the sealing end is used to sealingly engage with the valve port, and the restriction structure is used to fix the position of the sealing portion relative to the bushing and the spindle body.

[0007] Further, the limiting structure includes a first axial limiting structure and a second axial limiting structure, the first axial limiting structure being arranged between the connection end of the sealing portion and the spindle body, and the first axial limiting structure being used to limit the movement of the sealing portion in a direction away from the flow rate adjusting end, and the second axial limiting structure being arranged between the second end of the bushing and the sealing portion, and the second axial limiting structure being used to limit the movement of the sealing portion in a direction toward the flow rate adjusting end.

[0008] Furthermore, a first protrusion structure is provided on the outer wall of the spindle body, and the first protrusion structure is in limiting engagement with the end face of the connecting end of the sealing portion to form a first axial limiting structure; a second protrusion structure is provided on the outer wall of the sealing portion; and a third protrusion structure is provided on the inner wall of the second end of the bushing, and the second protrusion structure is in limiting engagement with the third protrusion structure to form a second axial limiting structure.

[0009] Further, the sealing portion includes a connecting segment and a sealing segment connected in order along the axial direction, the outer diameter dimension of the connecting segment being larger than the outer diameter dimension of the sealing segment, a second protrusion structure being formed between the connecting segment and the sealing segment, and / or an annular stop portion being provided on the inner wall of the second end of the bushing, the annular stop portion forming a third protrusion structure.

[0010] Furthermore, the sealing portion is interference-fitted to the spindle body and / or the bushing is interference-fitted to the sealing portion.

[0011] The spindle assembly also includes a third axial limiting structure, which is disposed between the bushing and the spindle body and is used to limit movement of the bushing in a direction away from the flow rate adjusting end.

[0012] Furthermore, a fourth protrusion structure is provided on the outer wall of the spindle body, and the fourth protrusion structure is used to engage with the end face of the first end of the bushing to form a third axial limiting structure.

[0013] Furthermore, along the axial direction of the spindle body, a projection of the fourth protrusion structure is located within the contour of the end surface of the first end of the bushing, and the end surface of the first end of the bushing is welded to the fourth protrusion structure.

[0014] Furthermore, the spindle body includes a cylindrical segment and a conical segment connected in sequence along the axial direction, the diameter of the conical segment gradually decreasing in a direction away from the cylindrical segment, and the conical segment forms a flow regulating end.

[0015] Furthermore, the end face of the sealing end of the sealing portion is provided so as to protrude from the cylindrical segment in a direction approaching the conical segment.

[0016] The spindle assembly further includes a spring sleeve, and the first end of the bushing is inserted into the spring sleeve and welded to the spring sleeve.

[0017] The spindle assembly also includes a fourth axial limiting structure, which is disposed between the spring sleeve and the bushing, and which is used to limit movement of the bushing in a direction away from the flow rate adjusting end.

[0018] Furthermore, a fifth protrusion structure is provided on the outer wall of the first end of the bushing, and the fifth protrusion structure is used to restrictively engage with the end surface of one end of the spring sleeve that is fitted to the bushing to form a fourth axial restrictive structure.

[0019] Furthermore, the distance between the end face of the first end of the bushing and the end face of the spring sleeve near the flow rate adjusting end is 6 mm or more.

[0020] According to another aspect of the present application, there is provided an electronic expansion valve including the spindle assembly described above.

[0021] By applying the technical aspect of the present application, a limiting structure is provided to limit the position of the sealing part relative to the bushing and spindle body, ensuring convenient fixation of the sealing part while also ensuring efficient and accurate machining of the spindle body. Specifically, in conventional technical aspects, a barb structure must be formed on the circumferential surface of the spindle, but the barb structure reduces the machining accuracy and efficiency of the spindle and makes it inconvenient to fit a sealing ring to the circumferential surface of the spindle. In this aspect, the bushing and spindle body are provided separately, and during assembly, the bushing and sealing part are fitted to the spindle body so that the connecting end of the sealing part is located between the bushing and the spindle body and the sealing end of the sealing part is located outside the bushing and adjacent to the flow regulating end of the spindle body. The limiting structure fixes the position of the sealing part relative to the spindle body and bushing. Therefore, compared to conventional technical aspects, this aspect ensures more accurate and efficient machining of the spindle body while also ensuring convenient assembly of the spindle assembly. [Brief explanation of the drawings]

[0022] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and their descriptions in the application are intended to help interpret the application and are not intended to unduly limit the application.

[0023] [Figure 1] 1 shows a structural schematic diagram of the engagement between a spindle and a sealing ring in the prior art; [Figure 2] 1 shows a structural schematic diagram of a spindle assembly provided by an embodiment of the present application. [Figure 3] 1 shows a structural schematic diagram of a spindle body provided by an embodiment of the present application. [Figure 4] 1 shows a structural schematic diagram of a bush provided by an embodiment of the present application. [Figure 5] 1 shows a structural schematic diagram of a sealing part provided by an embodiment of the present application. [Figure 6] 1 shows a structural schematic diagram of the engagement between a spring sleeve and a spindle assembly provided by an embodiment of the present application; [Figure 7] 1 shows a structural schematic diagram of an electronic expansion valve provided by an embodiment of the present application.

[0024] Here, the above drawings include the following reference numerals: 001 spindle, 002 sealing ring, 003 valve port, 01 1st protrusion structure, 02 2nd protrusion structure, 03 3rd protrusion structure, 04 4th protrusion structure, 05 5th protrusion structure, 10 spindle body, 11 cylindrical segment, 12 conical segment, 20 Bush, 30 sealing portion, 31 connection segment, 32 sealing segment, 40 spring sleeve, 50 screws, 60 springs, 70 bearings. DETAILED DESCRIPTION OF THE INVENTION

[0025] The technical aspects of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, all other embodiments that can be obtained by a person skilled in the art without creative efforts fall within the scope of protection of the present application.

[0026] 2 to 7 , an embodiment of the present application provides a spindle assembly including a spindle body 10, a bushing 20, a sealing portion 30, and a restriction structure. The spindle body 10 has a flow-regulating end that engages with a valve port 003 of an electronic expansion valve to regulate the flow rate at the valve port 003. The bushing 20 is fitted to the spindle body 10 and has a first end and a second end opposite each other. The second end of the bushing 20 is adjacent to the flow-regulating end, and the flow-regulating end protrudes from the second end of the bushing 20. The sealing portion 30 is fitted to the outer periphery of the spindle body 10 and has a connecting end and a sealing end opposite each other. The connecting end is located between the bushing 20 and the spindle body 10. The sealing end is located outside the bushing 20 and adjacent to the flow-regulating end, and is used for sealing engagement with the valve port 003. The limiting structure is used to fix the position of the seal 30 relative to the bushing 20 and spindle body 10 .

[0027] By applying the technical aspect of the present application, a limiting structure is provided to limit the position of the sealing part 30 relative to the bushing 20 and spindle body 10, ensuring the convenience of fixing the sealing part 30 while also ensuring the efficiency and precision of machining the spindle body 10. Specifically, in the conventional technical aspect, a barb structure needs to be formed on the circumferential surface of the spindle, but the barb structure reduces the accuracy and efficiency of machining the spindle and makes it inconvenient to fit a sealing ring to the circumferential surface of the spindle. In this aspect, the bushing 20 and the spindle body 10 are provided separately, and during assembly, the bushing 20 and the sealing part 30 are fitted to the spindle body 10 so that the connecting end of the sealing part 30 is located between the bushing 20 and the spindle body 10 and the sealing end of the sealing part 30 is located outside the bushing 20 and adjacent to the flow regulating end of the spindle body 10. The limiting structure fixes the position of the sealing part 30 relative to the spindle body 10 and the bushing 20. Therefore, compared to the conventional technical aspects, this aspect can ensure machining accuracy and machining efficiency for the spindle body 10, and can also ensure convenience in assembling the spindle assembly.

[0028] Furthermore, the limiting structure includes a first axial limiting structure and a second axial limiting structure. Here, the first axial limiting structure is provided between the connection end of the sealing portion 30 and the spindle body 10, and is used to limit movement of the sealing portion 30 in a direction away from the flow rate adjusting end. The second axial limiting structure is provided between the second end of the bushing 20 and the sealing portion 30, and is used to limit movement of the sealing portion 30 in a direction toward the flow rate adjusting end. Specifically, the first axial limiting structure and the second axial limiting structure are distributed at intervals along the axial direction of the sealing portion 30, which makes it easy to limit the axial position of the sealing portion 30 relative to the spindle body 10 and the bushing 20.

[0029] 2 to 5, a first protrusion structure 01 is provided on the outer wall of the spindle body 10, and the first protrusion structure 01 is engaged with the end face of the connecting end of the sealing part 30 to form a first axial limiting structure. In this embodiment, the spindle body 10 has a substantially cylindrical structure, and this embodiment does not limit the specific shape of the first protrusion structure 01, as long as it is provided to protrude from the circumferential surface of the spindle body 10.

[0030] In this embodiment, the first protrusion structure 01 is annularly provided on the outer wall of the spindle body 10, and the first protrusion structure 01 is coaxial with the spindle body 10, and the first protrusion structure 01 and the spindle body 10 are integrally molded.

[0031] The end face of the first protrusion structure 01 near the flow rate adjusting end abuts and engages with the end face of the connecting end of the sealing part 30, and the outer diameter of the first protrusion structure 01 is the same as the outer diameter of the connecting end of the sealing part 30. This ensures the regularity of the overall structure of the spindle body 10, making it possible to ensure ease and accuracy in processing the spindle body 10, and also ensuring concentricity between the spindle body 10 and the sealing part 30.

[0032] Specifically, a second protrusion structure 02 is provided on the outer wall of the sealing portion 30, and a third protrusion structure 03 is provided on the inner wall of the second end of the bushing 20, the second protrusion structure 02 is inserted into the bushing 20, and the second protrusion structure 02 is in restrictive engagement with the third protrusion structure 03 to form a second axial restrictive structure.

[0033] In this embodiment, the second protrusion structure 02 is provided on the outer wall of the sealing portion 30, the sealing portion 30 is located at one end close to the flow rate regulating end of the first protrusion structure 01, and the second protrusion structure 02 is provided close to the first protrusion structure 01, and the second protrusion structure 02 and the first protrusion structure 01 are in restrictive engagement.

[0034] In this embodiment, the specific form of the second protrusion structure 02 is not limited, as long as it is provided so as to protrude from the outer wall of the sealing portion 30. In this embodiment, the second protrusion structure 02 is provided in an annular shape on the outer periphery of the sealing portion 30, and the second protrusion structure 02 is coaxial with the sealing portion 30, and the second protrusion structure 02 and the sealing portion 30 are integrally molded.

[0035] The outer diameter of the second protrusion structure 02 is the same as the outer diameter of the third protrusion structure 03, and the inner diameter dimension of the second protrusion structure 02 is the same as the inner diameter dimension of the third protrusion structure 03, so that the end face of the second protrusion structure 02 closest to the flow rate adjusting end and the end face of the third protrusion structure 03 remote from the flow rate adjusting end abut against each other and engage with each other. This ensures the stability of the restrictive engagement between the second protrusion structure 02 and the third protrusion structure 03.

[0036] Specifically, the sealing portion 30 includes a connection segment 31 and a sealing segment 32 connected in sequence along the axial direction, the outer diameter of the connection segment 31 is larger than the outer diameter of the sealing segment 32, and the second protrusion structure 02 is provided corresponding to the connection segment 31.

[0037] An annular stopper is provided on the inner wall of the second end of the bushing 20, and the annular stopper forms the third protrusion structure 03. In this embodiment, the end of the second end of the bushing 20 near the flow rate regulating end is bent inward to form the annular stopper. That is, in this embodiment, the bushing 20 as a whole has a cylindrical structure with one end bent inward, and the outer diameter of the connecting segment 31 is the same as the outer diameter of the first protrusion structure 01, and the outer diameter of the sealing segment 32 is the same as the inner diameter of the third protrusion structure 03.

[0038] When specifically assembling the spindle assembly, first, the flow rate regulating end of the spindle body 10 is passed through the connection segment 31 and the sealing segment 32 of the sealing part 30 in order until the flow rate regulating end protrudes from the sealing segment 32 and the first protrusion structure 01 abuts against the end face of the connection segment 31 remote from the sealing segment 32, and then the flow rate regulating end of the spindle body 10 is passed through the bushing 20 from the end remote from the third protrusion structure 03 until the end face of the connection segment 31 close to the sealing segment 32 abuts and engages with the third protrusion structure 03. This makes it easy to assemble the spindle assembly.

[0039] Furthermore, the sealing portion 30 is interference-fitted to the spindle body 10, and the bushing 20 is interference-fitted to the sealing portion 30. With this configuration, relative rotation between the sealing portion 30 and the spindle body 10 and the bushing 20 is avoided or reduced, ensuring stable operation of the spindle assembly and the lifespan of the above three components.

[0040] Furthermore, the spindle assembly further includes a third axial limiting structure disposed between the bushing 20 and the spindle body 10, which is used to limit the movement of the bushing 20 in a direction away from the flow rate adjusting end. The installation of the third axial limiting structure can further ensure the stability and positional accuracy of the connection between the bushing 20 and the spindle body 10.

[0041] In this embodiment, the third axial limiting structure is disposed at one end of the first axial limiting structure that is remote from the second axial limiting structure, which further ensures the rationality of the overall structure of the spindle assembly.

[0042] Specifically, a fourth protrusion structure 04 is provided on the outer wall of the spindle body 10, and the fourth protrusion structure 04 is used to engage with the end face of the first end of the bushing 20 to form a third axial limiting structure.

[0043] This embodiment does not limit the specific shape of the fourth protrusion structure 04, as long as it protrudes from the outer wall of the spindle body 10. In this embodiment, the fourth protrusion structure 04 is provided in an annular shape on the outer wall of the first protrusion structure 01, a portion of the first protrusion structure 01 is inserted into the bushing 20, and the fourth protrusion structure 04 and the end face of the bushing 20 away from the flow rate adjusting end are abutted and engaged. This ensures that a portion of the spindle body 10 and a portion of the sealing member 30 are both inserted into the bushing 20, ensuring a stable connection between the three.

[0044] Furthermore, along the axial direction of the spindle body 10, a projection of the fourth protrusion structure 04 is located within the contour of the end face of the first end of the bushing 20, and the end face of the first end of the bushing 20 is welded to the fourth protrusion structure 04. By welding the first end of the bushing 20 to the fourth protrusion structure 04, the stability of the connection between the spindle body 10 and the bushing 20 can be further ensured, and the welding position can be located between the end face of the first end of the bushing 20 and the fourth protrusion structure 04. Because the projection of the fourth protrusion structure 04 is located within the end face of the first end of the bushing 20 along the axial direction of the spindle body 10, this makes it possible to prevent a weld bead generated during welding from protruding from the outer peripheral surface of the fourth protrusion structure 04 or the outer peripheral surface of the bushing 20.

[0045] Furthermore, the spindle body 10 includes a cylindrical segment 11 and a conical segment 12 connected in sequence along the axial direction, and the diameter of the conical segment 12 gradually decreases in the direction away from the cylindrical segment 11, and the conical segment 12 forms a flow rate regulating end. The installation of the conical segment 12 ensures the accuracy of flow rate regulation for the valve orifice 003.

[0046] Furthermore, the end face of the sealing end of the sealing portion 30 protrudes from the cylindrical segment 11 in a direction approaching the conical segment 12. This ensures that the end face of the sealing end of the sealing portion 30 abuts and engages with the end face of the valve orifice 003, thereby ensuring a sealing effect for the valve orifice 003.

[0047] 6 , the spindle assembly further includes a spring sleeve 40, and a first end of the bushing 20 is inserted into and welded to the spring sleeve 40. Specifically, in this embodiment, one end of the bushing 20 remote from the flow rate adjusting end is inserted into the spring sleeve 40 and interference-fitted to the spring sleeve 40, and the fourth protrusion structure 04 of the spindle body 10 is also inserted into the spring sleeve 40. The projection of the fourth protrusion structure 04 along the axial direction of the spindle assembly is located within the end face remote from the flow rate adjusting end of the bushing 20, thereby creating a certain gap between the outer circumferential surface of the fourth protrusion structure 04 and the spring sleeve 40, which prevents welding slag generated during the welding process from falling into the spring sleeve 40 and affecting the normal operation of other components within the spring sleeve 40.

[0048] The spindle assembly further includes a fourth axial limiting structure, which is disposed between the spring sleeve 40 and the bushing 20 and serves to limit the movement of the bushing 20 away from the flow rate adjusting end. The provision of the fourth axial limiting structure further ensures the stability and assembly accuracy of the connection between the spring sleeve 40 and the bushing 20.

[0049] 4 and 6, in this embodiment, a fifth protrusion structure 05 is provided on the outer wall of the first end of the bushing 20, and the fifth protrusion structure 05 is used to restrictively engage with the end surface of the spring sleeve 40 at one end that is fitted into the bushing 20 to form a fourth axial restriction structure. This embodiment does not limit the specific form of the fifth protrusion structure 05, and in this embodiment, the fifth protrusion structure 05 is provided in an annular shape on the outer wall of the bushing 20, and the outer diameter of the fifth protrusion structure 05 is smaller than the outer diameter of the spring sleeve 40. This prevents the fifth protrusion structure 05 from interfering with other components of the electronic expansion valve, ensuring smooth operation of the valve core assembly.

[0050] Furthermore, the distance between the end face of the first end of the bushing 20 and the end face of the spring sleeve 40 close to the flow rate adjusting end is 6 mm or more, i.e., the overlap dimension of the bushing 20 with the spring sleeve 40 is 6 mm or more. Specifically, the bushing 20 and the spring sleeve 40 are interference-fitted and welded to each other. This ensures a sufficient length of connection between the bushing 20 and the spring sleeve 40 and ensures the stability of the connection between the bushing 20 and the spring sleeve 40. Here, if the distance between the end face of the first end of the bushing 20 and the end face of the spring sleeve 40 close to the flow rate adjusting end is H, H may be 6 mm, 7 mm, 8 mm, or 10 mm, and in this embodiment, H is 6 mm.

[0051] According to the technical aspects provided by the present application, the regularity of the spindle body 10, the bushing 20 and the sealing portion 30 can be ensured, and the processing efficiency and processing accuracy of the spindle body 10, the bushing 20 and the sealing portion 30 can be ensured, and the assembly accuracy and assembly efficiency of the spindle assembly can be ensured.

[0052] 1 to 7, the present application further provides an electronic expansion valve including the above-mentioned spindle assembly. The end of the valve port 003 of the electronic expansion valve has an annular protrusion structure, which is used to abut and engage with the sealing end of the sealing part 30 to ensure the sealing effect of the sealing end with respect to the valve port 003.

[0053] The electronic expansion valve further includes a screw 50, a spring 60, and a bearing 70. The spring 60 is disposed within the spring sleeve 40, with one end of the spring 60 fitted into an end of the spindle body 10 remote from the flow-regulating end and abutting against the end face of the first protrusion structure 01. The bearing 70 is disposed within the spring sleeve 40 and located at an end of the spring 60 remote from the spindle body 10, with the outer circumferential surface of the bearing 70 fixedly connected to the inner circumferential surface of the spring sleeve 40. One end of the screw 50 is inserted into and fixedly connected to the inner ring of the bearing 70. As a result, when the spindle body 10 opens, the spring 60 acts as a buffer against the movement of the spindle body 10, ensuring smooth opening of the spindle body 10. The installation of the bearing 70 also ensures that the spindle body 10 only moves linearly during opening and closing, ensuring smooth opening and closing of the valve.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should also be understood that when the terms "comprise" and / or "comprises" are used herein, it means that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0055] Unless otherwise specifically stated, the relative arrangements of components and steps, formulas, and numerical values ​​described in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for convenience of explanation, the dimensions of each part shown in the drawings are not drawn to actual proportions. Detailed descriptions of techniques, methods, and equipment already known to those skilled in the art may be omitted; however, such techniques, methods, and equipment should be considered as part of the approved specification, as appropriate. In all examples shown and described herein, any specific values ​​are merely illustrative and should not be construed as limiting. Therefore, other examples of the illustrative embodiments may have different values. It should be noted that similar symbols and characters represent similar objects in the following drawings, so that once something is defined in one drawing, it need not be further described in subsequent drawings.

[0056] In the description of this application, orientations or positional relationships expressed by directional terms such as "front, rear, top, bottom, left, right," "lateral, longitudinal, vertical, horizontal," and "top, bottom" are generally based on the orientations or positional relationships shown in the drawings, but this is merely for the ease and simplicity of the description of this application, and unless otherwise stated, these directional terms do not necessarily indicate or imply that the devices or elements shown have a specific orientation or are constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of this application, and directional terms such as "inside, outside" refer to the inside and outside of the contours of each member itself.

[0057] For convenience of description, spatially relative terms such as "above," "upper," "on top of," "above," etc. may be used herein to describe the spatial location of one device or feature relative to another device or feature, as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the figures of the device. For example, if a device in the figures were turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can encompass two orientations: "above" and "below." The device can also be oriented in other different ways (rotated 90 degrees or positioned at other orientations) and a corresponding interpretation given to the spatially relative descriptions used herein.

[0058] It should be further explained that the use of terms such as "first" and "second" to define components is merely for distinguishing corresponding components, and should not be understood as limiting the scope of protection of the present application, since the terms do not have any special meaning unless otherwise specified.

[0059] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A spindle assembly including a spindle body (10), a bushing (20), a sealing portion (30) and a limiting structure, The spindle body (10) has a flow rate adjusting end, which is used to engage with a valve port (003) of an electronic expansion valve to adjust the flow rate at the valve port (003); The bushing (20) is fitted to the spindle body (10) and has a first end and a second end provided opposite to each other, the second end of the bushing (20) being provided adjacent to the flow rate adjusting end, and the flow rate adjusting end being provided protruding from an end of the second end of the bushing (20); The sealing portion (30) is fitted to the outer periphery of the spindle body (10) and has a connecting end and a sealing end provided opposite to each other, the connecting end being located between the bushing (20) and the spindle body (10), the sealing end being located outside the bushing (20) and provided adjacent to the flow rate adjusting end, and the sealing end being used to sealingly engage with the valve port (003); The limiting structure is used to fix the position of the sealing portion (30) relative to the bushing (20) and the spindle body (10). Spindle assembly.

2. the restraint structure includes a first axial restraint structure and a second axial restraint structure; the first axial limiting structure is provided between the connection end of the sealing portion (30) and the spindle body (10), and the first axial limiting structure is used to limit the movement of the sealing portion (30) in a direction away from the flow rate adjusting end; The second axial limiting structure is provided between the second end of the bushing (20) and the sealing portion (30), and the second axial limiting structure is used to limit the movement of the sealing portion (30) toward the flow rate adjusting end. The spindle assembly of claim 1 .

3. a first protrusion structure (01) is provided on the outer wall of the spindle body (10), and the first protrusion structure (01) is engaged with an end surface of the connecting end of the sealing portion (30) to form the first axial limiting structure; a second protrusion structure (02) on the outer wall of the sealing portion (30), and a third protrusion structure (03) on the inner wall of the second end of the bushing (20), the second protrusion structure (02) being in restrictive engagement with the third protrusion structure (03) to form the second axial restricting structure; The spindle assembly of claim 2 .

4. The sealing portion (30) includes a connection segment (31) and a sealing segment (32) connected in order along the axial direction, the outer diameter of the connection segment (31) being larger than the outer diameter of the sealing segment (32), and the second protrusion structure (02) being formed between the connection segment (31) and the sealing segment (32), and / or An inner wall of the second end of the bushing (20) is provided with an annular stop, which forms the third protrusion structure (03). The spindle assembly of claim 3 .

5. The sealing portion (30) is interference-fitted to the spindle body (10), and / or The bushing (20) is interference-fitted into the sealing portion (30). The spindle assembly of claim 1 .

6. further comprising a third axial restraining structure; the third axial limiting structure is provided between the bushing (20) and the spindle body (10), and the third axial limiting structure is used to limit the movement of the bushing (20) in a direction away from the flow rate adjusting end; The spindle assembly of claim 1 .

7. a fourth protrusion structure (04) is provided on the outer wall of the spindle body (10), and the fourth protrusion structure (04) is used to restrictively engage with an end surface of the first end of the bushing (20) to form the third axial restrictive structure; The spindle assembly of claim 6.

8. A projection of the fourth protrusion structure (04) is located within the contour of the end surface of the first end of the bush (20) along the axial direction of the spindle body (10), and the end surface of the first end of the bush (20) is welded to the fourth protrusion structure (04). The spindle assembly of claim 7.

9. The spindle body (10) includes a cylindrical segment (11) and a conical segment (12) connected in sequence along an axial direction, the diameter of the conical segment (12) gradually decreasing in a direction away from the cylindrical segment (11), and the conical segment (12) forms the flow rate regulating end. The spindle assembly of claim 1 .

10. The end face of the sealing end of the sealing portion (30) is provided to protrude from the cylindrical segment (11) in a direction approaching the conical segment (12). The spindle assembly of claim 9.

11. Further comprising a spring sleeve (40); The first end of the bush (20) is inserted into the spring sleeve (40) and welded to the spring sleeve (40). The spindle assembly of claim 1 .

12. further comprising a fourth axial restraining structure; the fourth axial limiting structure is provided between the spring sleeve (40) and the bushing (20), and the fourth axial limiting structure is used to limit the movement of the bushing (20) in a direction away from the flow rate adjusting end. The spindle assembly of claim 11.

13. a fifth protrusion structure (05) is provided on an outer wall of the first end of the bushing (20), and the fifth protrusion structure (05) is used to form the fourth axial limiting structure by limiting engagement with an end surface of one end of the spring sleeve (40) that is fitted to the bushing (20); The spindle assembly of claim 12.

14. The distance between the end face of the first end of the bushing (20) and the end face of the spring sleeve (40) close to the flow rate adjusting end is 6 mm or more. The spindle assembly of claim 13.

15. A spindle assembly comprising: a spindle assembly according to any one of claims 1 to 14; Electronic expansion valve.

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