Electronic Expansion Valve

Abstract

The electronic expansion valve includes a valve seat (10), a valve core sleeve (90) welded to the valve seat to form a welded structure, and a mounting base (100) having a second mounting passage, in which both the valve seat and the valve core sleeve are mounted in the second mounting passage, and an avoidance space is provided on the outer wall of the valve seat or the valve core sleeve to avoid the welded structure, or an avoidance space is provided on the inner wall of the mounting base to avoid the welded structure. This electronic expansion valve can solve the technical problem of the prior art that it is difficult to mount the valve seat to the mounting base.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on November 30, 2021, bearing application number 202123009820.1 and entitled "Electronic Expansion Valve."

[0002] The present application relates to the technical field of electronic expansion valves, and more particularly to electronic expansion valves. [Background technology]

[0003]

[0003] Currently, a conventional electronic expansion valve includes a valve seat, a valve core, and a spindle movably mounted within the valve seat. One end of the valve core is inserted into the valve seat and the other end protrudes from the valve seat, and the valve core has a valve port that is sealed or blocked by the spindle. The electronic expansion valve also includes a valve seat and a valve core sleeve, and the valve seat and the valve core sleeve are usually welded together to form a welded structure in order to improve the positioning stability of the valve core.

[0004] However, when attaching the valve seat to the mounting base, the welded structure often becomes an obstacle, which is disadvantageous to smoothly attaching the valve seat to the mounting base. Summary of the Invention

[0005] The main object of the present application is to provide an electronic expansion valve that solves the technical problem in the prior art that it is difficult to attach a valve seat to a mounting base.

[0006] To achieve the above object, the present application provides an electronic expansion valve including a valve seat, a valve core sleeve welded to the valve seat to form a welded structure, and a mounting base having a second mounting passage, in which both the valve seat and the valve core sleeve are mounted within the second mounting passage, wherein an avoidance space for avoiding the welded structure is provided on the outer wall of the valve seat or the valve core sleeve, or an avoidance space for avoiding the welded structure is provided on the inner wall of the mounting base.

[0007] Furthermore, a relief notch is provided at the end of the valve seat or the valve core sleeve, and the relief notch forms an escape space, and the valve core sleeve and the valve seat are welded at the relief notch.

[0008] Furthermore, the welded structure is a welded ring structure, and the valve core sleeve and the valve seat are welded at the relief notch to form the welded ring structure, the outer diameter of the welded ring structure is d1, the outer diameter of the valve seat is d2, and the outer diameter of the valve core sleeve is d3; d1≦d2 and / or d1≦d3 is.

[0009] Furthermore, the welded structure is a welded ring structure, and the valve core sleeve is welded to the end of the valve seat to form the welded ring structure, and an avoidance recess is provided on the mounting base, and the avoidance recess is provided opposite the welded ring structure so that the avoidance recess can avoid the welded ring structure.

[0010] Furthermore, the outer diameter of the welded ring structure is d1, and the outer diameter of the valve seat is d2; d1>d2 is.

[0011] Furthermore, the valve seat has a first mounting passage, and the electronic expansion valve further includes a spindle movably disposed within the first mounting passage, and a drive assembly disposed at one end of the valve seat, power-transmittingly connected to the spindle, and driving and moving the spindle.

[0012] Additionally, the core sleeve is attached to the valve seat at one end remote from the drive assembly.

[0013] Furthermore, the electronic expansion valve further includes a valve core, which is installed in the first installation passage and has a valve port that is opened and closed by a spindle. The valve core sleeve includes a main body and a positioning part that are connected to each other, at least a portion of the main body is inserted into the first installation passage and an end of the main body is abutted against an end of the valve core. The positioning part protrudes from the outer wall of the main body and is used to abut against and position the end of the valve seat, and is fixed to the end of the valve seat by welding to form a welded structure.

[0014] Furthermore, a first mounting port is formed at one end of the first mounting passage, and a second mounting port is formed at the other end of the first mounting passage, the first mounting port is located above the second mounting port, and the cross-sectional area of ​​the second mounting port is larger than that of the first mounting port, the valve core sleeve is mounted in the second mounting port, and the cross-sectional area of ​​the spindle is larger than that of the first mounting port and smaller than that of the second mounting port, so that the spindle is mounted in the first mounting passage through the second mounting port.

[0015] Furthermore, the electronic expansion valve further includes a valve core, which is installed in the first installation passage and has a valve port that is opened and closed by the spindle, and is made of a material that is lower in hardness than the spindle. A sealing surface is formed on an inner wall or end surface of the valve core, and the sealing surface is engaged with an outer wall surface of the spindle to form a soft sealing structure.

[0016] Furthermore, a sealing surface is formed on the inner wall of the valve core, and the valve core has a first end and a second end arranged opposite to each other, the first end is arranged on the side of the second end closer to the spindle, and the flow area of ​​the sealing surface gradually decreases along the direction of extension from the first end to the second end.

[0017] Furthermore, the electronic expansion valve further includes a spring sleeve having one end fitted to the end of the spindle, a spring mounted within the spring sleeve, a screw provided at the other end of the spring sleeve, and a bearing fitted to the screw and positioned between the screw and the spring sleeve.

[0018]

[0013] When the technical aspects of the present application are applied, the valve core is installed in the first installation passage and positioned by the positioning portion of the valve core sleeve abutting against the valve core, making it easy to stably position the valve core in the first installation passage. Furthermore, the positioning portion of the valve core sleeve abuts against the edge of the valve seat and is fixed by welding, so the valve core sleeve can be stably fixed to the valve seat, ensuring the stability of the position of the valve core sleeve and better ensuring the stability of the installation of the valve core. By providing an avoidance space to avoid the welding structure on the outer wall of the valve seat or the valve core sleeve, or by providing an avoidance space to avoid the welding structure on the inner wall of the installation base, the avoidance space can avoid the welding structure and make it easy to avoid the protrusions of the welding structure that make it difficult to install the valve seat on the installation base, making it easy to install the valve seat on the installation base smoothly. [Brief explanation of the drawings]

[0019] 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 descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0020] [Figure 1] 1 shows a structural schematic diagram of a partial structure of an electrically operated valve provided by an embodiment of the present application. [Figure 2] An exploded view of the partial structure in FIG. 1 is shown. [Figure 3] 1 shows a structural schematic diagram of the mounting of the screw, bearing and spring sleeve provided by an embodiment of the present application. [Figure 4] 1 shows a structural schematic diagram of a bearing provided by an embodiment of the present application fitted onto a screw. [Figure 5] 2 shows a schematic diagram of the structure in FIG. 1 mounted on a mounting base.

[0021] Here, the above drawings include the following reference numerals: 10 valve seat, 11 relief notch, 20 spindle, 30 valve core, 31 sealing surface, 41 first sealing member, 42 second sealing member, 43 third sealing member, 50 spring sleeve, 60 spring, 70 screw, 80 bearing, 90 valve core sleeve, 91 main body portion, 92 positioning portion, 100 mounting base. DETAILED DESCRIPTION OF THE INVENTION

[0022] It should be noted that, unless contradictory, the embodiments and features in the embodiments in the present application can be combined with each other. The present application will be described in detail below in conjunction with the embodiments with reference to the drawings.

[0023] 1 to 5, the electronic expansion valve provided in the embodiment of the present application includes a valve seat 10, a spindle 20, a drive assembly, a valve core sleeve 90, and a mounting base 100, wherein the valve seat 10 has a first mounting passage, the spindle 20 is movably mounted within the first mounting passage, the drive assembly is mounted at one end of the valve seat 10 and is power-transmittingly connected to the spindle 20 to drive and move the spindle 20, the valve core sleeve 90 is mounted at one end of the valve seat 10 remote from the drive assembly, and the valve core sleeve 90 is welded to the valve seat 10 to form a welded structure. The mounting base 100 has a second mounting passage, and both the valve seat 10 and the valve core sleeve 90 are mounted within the second mounting passage, wherein an avoidance space is provided on the outer wall of the valve seat 10 or the valve core sleeve 90 to avoid a welded structure, or an avoidance space is provided on the inner wall of the mounting base 100 to avoid a welded structure.

[0024]

[0033] With the electronic expansion valve provided in this embodiment, the valve core 30 is installed in the first installation passage and positioned by the positioning portion 92 of the valve core sleeve 90, which facilitates stable positioning of the valve core 30 in the first installation passage. Furthermore, the positioning portion 92 of the valve core sleeve 90 is positioned by abutting against the end of the valve seat 10 and fixed by welding, which stably fixes the valve core sleeve 90 to the valve seat 10, ensuring the stability of the position of the valve core sleeve 90 and better ensuring the stability of the installation of the valve core 30. Furthermore, an escape space is provided on the outer wall of the valve seat 10 or the valve core sleeve 90, or an escape space is provided on the inner wall of the mounting base 100 to avoid the welding structure. The escape space avoids the welding structure, which facilitates the prevention of the protrusions of the welding structure that would make it difficult to install the valve seat 10 on the mounting base 100, and facilitates smooth installation of the valve seat 10 on the mounting base 100. Therefore, the technical aspect provided by this embodiment can solve the technical problem of the prior art that it is difficult to attach the valve seat 10 to the attachment base 100.

[0025] Specifically, in this embodiment, a relief notch 11 is provided at the end of the valve seat 10 or the valve core sleeve 90, and the relief notch 11 forms an escape space, and the valve core sleeve 90 and the valve seat 10 are welded at the relief notch 11. By adopting this configuration, it is easy to prevent welding slag generated from the welded structure formed by the positioning portion 92 and the valve seat 10 from protruding and affecting the installation of the valve seat 10. Specifically, in this embodiment, laser welding is used to self-melt and connect the valve seat 10 and the positioning portion 92, so welding slag is generated, but the relief notch 11 can prevent the welding slag from protruding and affecting the installation.

[0026] In this embodiment, the welded structure is a welded ring structure, in which the valve core sleeve 90 and the valve seat 10 are welded at the relief notch 11 to form a welded ring structure, the outer diameter of the welded ring structure is d1, the outer diameter of the valve seat 10 is d2, and the outer diameter of the valve core sleeve 90 is d3; d1≦d2 and / or d1≦d3 Preferably, d1≦d2 and d1≦d3 By doing so, the welded structure at this portion will be prevented from protruding and the valve seat 10 will be prevented from being attached to the mounting base 100 or the valve body, thereby ensuring the reliability of the attachment.

[0027] In another embodiment, the positioning portion 92 is welded to the end of the valve seat 10 to form a welded ring structure, i.e., the welded structure is a ring-shaped structure. The electronic expansion valve further includes a mounting base 100 having a second mounting passage, and the valve seat 10, the valve core 30, and the valve core sleeve 90 are all mounted in the second mounting passage. The mounting base 100 is provided with an escape recess, which is located opposite the welded ring structure to escape the welded ring structure. This configuration effectively prevents protruding welding slag generated by welding from affecting the mounting status of the valve seat 10, ensuring the reliability of the mounting.

[0028] In this embodiment, the outer diameter of the welded ring structure is d1, the outer diameter of the valve seat 10 is d2, d1>d2 By adopting such a structural design, the avoidance recess can effectively avoid the weld ring structure, facilitating smooth installation.

[0029] The electronic expansion valve further includes a valve core 30, which is mounted in the first mounting passage and has a valve port that is opened and closed by the spindle 20. A valve core sleeve 90 is mounted on one end of the valve core 30 remote from the spindle 20. The valve core sleeve 90 includes a main body 91 and a positioning portion 92 connected to each other. At least a portion of the main body 91 is inserted into the first mounting passage, and an end of the main body 91 abuts against an end of the valve core 30. The positioning portion 92 protrudes from the outer wall of the main body 91 and abuts against an end of the valve seat 10 for positioning. The positioning portion 92 is fixed to the end of the valve seat 10 by welding. This configuration facilitates optimization of the structural layout and improves the structural connection stability and reliability. Preferably, the welding method in this embodiment is laser welding.

[0030] In the above two embodiments, a first mounting hole is formed at one end of the first mounting passage, and a second mounting hole is formed at the other end of the first mounting passage, the first mounting hole being located above the second mounting hole, the cross-sectional area of ​​the second mounting hole being larger than that of the first mounting hole, and the valve core sleeve 90 is mounted in the second mounting hole. Here, the cross-sectional area of ​​the spindle 20 is larger than that of the first mounting hole but smaller than that of the second mounting hole so that the spindle 20 can be mounted in the first mounting passage through the second mounting hole. This configuration makes it easy to mount the spindle 20 in the first mounting passage through the second mounting hole, and the spindle 20 can be flipped, facilitating installation and removal.

[0031] Specifically, the valve core 30 has a tubular structure, and the outer shape of the valve core 30 matches the shape of the second mounting port so that the valve core 30 can be mounted in the first mounting passage through the second mounting port. This configuration facilitates flipping of the valve core 30 and mounting the valve core 30 from the bottom upward into the first mounting passage, simplifying the mounting operation. Since the valve core 30 can be mounted through the second mounting port, the valve core 30 can be configured with a large diameter to achieve high flow rate communication.

[0032] In the above embodiment, the electronic expansion valve further includes a valve core 30, which is installed in the first installation passage and has a valve port that is opened and closed by the spindle 20. The valve core 30 is made of a material with a lower hardness than the spindle 20. The valve core 30 has a sealing surface 31 formed on its inner wall or end surface, which engages with the outer wall surface of the spindle 20 to form a soft sealing structure. This soft sealing structure prevents leakage between the valve core 30 and the valve seat 10 and improves the sealing performance of the electronic expansion valve. Specifically, the valve core 30 is made of a non-metallic material, and in this embodiment, the valve core 30 is mainly made of a plastic material. In this way, after the non-metallic valve core 30 and the metallic spindle 20 are installed, the non-metallic material is softer than the metallic material, and the hard and soft materials can be easily combined to improve the sealing performance.

[0033] The valve core 30 in the above embodiment is made of polytetrafluoroethylene material, which facilitates better improving the sealing performance of the motor-operated valve.

[0034] Specifically, a sealing surface 31 is formed on the inner wall of the valve core 30, and the valve core 30 has a first end and a second end opposite each other, with the first end being located on the side of the second end closest to the spindle 20, and the flow area of ​​the sealing surface 31 gradually decreasing along the direction from the first end to the second end. This configuration can easily improve the sealing performance between the valve core 30 and the spindle 20 and reduce leakage between the valve core 30 and the spindle 20.

[0035] In the above two embodiments, the electronic expansion valve further includes a spring sleeve 50, a spring 60, a screw 70, and a bearing 80, where one end of the spring sleeve 50 is fitted onto the end of the spindle 20, the spring 60 is installed inside the spring sleeve 50, and the screw 70 is provided at the other end of the spring sleeve 50. The bearing 80 is fitted onto the screw 70 and is located between the screw 70 and the spring sleeve 50. With this configuration, the bearing 80 is provided between the screw 70 and the spring sleeve 50, and a soft seal is formed between the valve core 30 and the spindle 20, so that the friction force between the valve core 30 and the spindle 20 is smaller than the friction force between the valve core 30 and the valve seat 10, thereby avoiding the wear problem of the soft-sealing valve port.

[0036] Specifically, this electronic expansion valve further includes a drive assembly for driving and moving the spindle 20. The drive assembly includes a rotor assembly and a nut assembly, the rotor assembly is fitted onto the outside of the nut assembly, one end of the screw 70 remote from the spindle 20 is fixedly connected to the rotor assembly, and the rotor assembly moves the spindle 20 in the axial direction in conjunction with the screw 70, thereby adjusting the opening of the valve port. The nut assembly has an internal thread that is threaded onto the spindle 20, and the nut assembly is fixedly connected to the valve seat 10 by a connecting member.

[0037] In the above embodiment, the spindle 20 is provided with a first sealing member 41 located between the spindle 20 and the valve seat 10 to improve the sealing performance between the spindle 20 and the valve seat 10. A second sealing member 42 is provided between the mounting base 100 and the valve seat 10, and a third sealing member 43 is provided between the mounting base 100 and the valve core sleeve 90. Adopting such a configuration facilitates better improvement of the sealing performance of the electronic expansion valve.

[0038] As can be seen from the above description, the above embodiment achieves the technical effects of improving the stability of the installation of the valve core 30 and facilitating smooth assembly of the valve core 30 .

[0039] 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 also intends 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.

[0040] 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 this 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, but, where necessary, these techniques, methods, and equipment should be considered part of the approved specification. In all examples shown and described herein, any specific values ​​should be construed as merely illustrative and not 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 once something is defined in one drawing, it need not be further described in subsequent drawings.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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. An electronic expansion valve comprising: a valve seat (10); a valve core sleeve (90) welded to the valve seat (10) to form a welded structure; and a mounting base (100) having a second mounting passage, in which both the valve seat (10) and the valve core sleeve (90) are mounted, An avoidance space for avoiding the welding structure is provided on the outer wall of the valve seat (10) or the valve core sleeve (90), or an avoidance space for avoiding the welding structure is provided on the inner wall of the mounting base (100), The valve seat (10) has a first mounting passage; The electronic expansion valve further includes a spindle (20) movably mounted within the first mounting passage, and a drive assembly mounted at one end of the valve seat (10) and power-transmittingly connected to the spindle (20) to drive and move the spindle (20).

2. 2. The electronic expansion valve according to claim 1, wherein a relief notch (11) is provided at an end of the valve seat (10) or the valve core sleeve (90), the relief notch (11) forms the escape space, and the valve core sleeve (90) and the valve seat (10) are welded to each other at the relief notch (11).

3. the welded structure is a welded ring structure, The valve core sleeve (90) and the valve seat (10) are welded together at the relief notch (11) to form a welded ring structure; The outer diameter of the welded ring structure is d １ and the outer diameter of the valve seat (10) is d ２ and the outer diameter of the valve core sleeve (90) is d ３ and d １ ≦d ２ and / or d １ ≦d ３ 3. The electronic expansion valve according to claim 2, wherein:

4. the welded structure is a welded ring structure, The valve core sleeve (90) is welded to the end of the valve seat (10) to form a welded ring structure; 2. The electronic expansion valve according to claim 1, wherein the mounting base (100) is provided with an avoidance recess, and the avoidance recess is provided opposite the weld ring structure so as to avoid the weld ring structure by the avoidance recess.

5. The outer diameter of the welded ring structure is d １ and the outer diameter of the valve seat (10) is d ２ and d １ >d ２ 5. The electronic expansion valve according to claim 4, wherein:

6. 2. The electronic expansion valve of claim 1, wherein the valve core sleeve (90) is attached to an end of the valve seat (10) remote from the drive assembly.

7. The electronic expansion valve further includes a valve core (30); The valve core (30) is mounted in the first mounting passage and has a valve port that is opened and closed by the spindle (20). The valve core sleeve (90) includes a main body portion (91) and a positioning portion (92) connected to each other, At least a portion of the body portion (91) is inserted into the first mounting passage, The end of the main body portion (91) is abutted against the end of the valve core (30), 2. The electronic expansion valve according to claim 1, wherein the positioning portion (92) is provided to protrude from an outer wall of the main body portion (91), is used to abut against an end of the valve seat (10) for positioning, and is fixed to the end of the valve seat (10) by welding to form a welded structure.

8. A first mounting opening is formed at one end of the first mounting passage, A second mounting opening is formed at the other end of the first mounting passage, the first mounting opening is located above the second mounting opening, The cross-sectional area of ​​the second mounting hole is larger than the cross-sectional area of ​​the first mounting hole, The valve core sleeve (90) is attached to the second attachment port, 2. The electronic expansion valve according to claim 1, wherein the cross-sectional area of ​​the spindle is larger than the cross-sectional area of ​​the first mounting port and smaller than the cross-sectional area of ​​the second mounting port such that the spindle is mounted in the first mounting passage through the second mounting port.

9. The electronic expansion valve further includes a valve core (30); The valve core (30) is mounted in the first mounting passage, has a valve port that is opened and closed by the spindle (20), and is made of a material that is lower in hardness than the spindle (20); A sealing surface (31) is formed on the inner wall or end surface of the valve core (30); 2. The electronic expansion valve according to claim 1, wherein the sealing surface (31) is engaged with an outer wall surface of the spindle (20) to form a soft sealing structure.

10. The sealing surface (31) is formed on the inner wall of the valve core (30), The valve core (30) has a first end and a second end provided opposite to each other, The first end is provided on a side of the second end that is adjacent to the spindle (20), 10. The electronic expansion valve according to claim 9, wherein the flow area of ​​the sealing surface (31) gradually decreases along the direction of extension from the first end to the second end.

11. a spring sleeve (50) having one end fitted to the end of the spindle (20) and a spring (60) mounted within the spring sleeve (50); a screw (70) provided at the other end of the spring sleeve (50); a bearing (80) fitted to the screw (70) and positioned between the screw (70) and the spring sleeve (50); The electronic expansion valve of claim 1 , further comprising:

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