Electronic expansion valve

Abstract

The utility model relates to the technical field of fluid control, in particular to an electronic expansion valve. An electronic expansion valve comprises a valve seat, a shell assembly, a motor and a connecting plate, one end of the shell assembly extends into the valve seat and is connected with the valve seat in a sealed mode, the motor and the connecting plate are arranged in the shell assembly, and the motor is installed on the connecting plate; a step is arranged in the shell assembly, and the connecting plate is installed on the step in a pressing mode and fixed to the shell assembly in a welded mode. The utility model has the advantages that the connecting plate is firstly pressed on the step to realize pre-fixation, and then is welded with the shell assembly, so that not only is the installation convenient, but also the connection strength of the connecting plate is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of fluid control technology, and in particular to an electronic expansion valve. Background Technology

[0002] Electronic expansion valves are typically used as throttling elements in refrigeration systems. Electronic expansion valves include a motor, which needs to be installed and fixed using a connecting plate.

[0003] In the existing technology, the connection strength between the connecting plate and the housing is insufficient, which causes the connecting plate to loosen and affects the normal operation of the motor. Utility Model Content

[0004] In view of this, it is necessary to provide an electronic expansion valve that can enhance the installation strength of the connecting plate.

[0005] This utility model provides an electronic expansion valve, including a valve seat, a housing assembly, a motor, and a connecting plate. One end of the housing assembly extends into the valve seat and is sealed to the valve seat. The motor and the connecting plate are disposed inside the housing assembly, and the motor is mounted on the connecting plate. A step is provided inside the housing assembly, and the connecting plate is press-fitted onto the step and welded to the housing assembly.

[0006] Understandably, pressing the connecting plate onto the step first to achieve pre-fixation, and then welding it to the housing assembly, not only facilitates installation but also strengthens the connection strength of the connecting plate.

[0007] In one embodiment, the housing assembly includes a housing cover and a guide sleeve, one end of the guide sleeve being connected to the valve seat and the other end being connected to the housing cover, and the motor being disposed inside the housing cover;

[0008] The step is located on the end face of the housing near the guide sleeve, and the side of the connecting plate away from the motor abuts against the end face of the guide sleeve.

[0009] In one embodiment, the housing assembly includes a housing cover and a guide sleeve, one end of the guide sleeve being connected to the valve seat and the other end being connected to the housing cover, and the motor being disposed inside the housing cover;

[0010] The step is located on the end face of the guide sleeve near the end of the housing cover, and the side of the connecting plate near the motor abuts against the end face of the housing cover.

[0011] With this setup, welding can be performed on the gap between the end face of the housing cover and the guide sleeve, allowing the connecting plate and housing cover to be directly welded and fixed, saving steps and improving installation efficiency.

[0012] In one embodiment, the housing assembly includes a housing cover and a guide sleeve, one end of the guide sleeve being connected to the valve seat and the other end being connected to the housing cover, and the motor being disposed inside the housing cover;

[0013] The step is located on the inner wall of the guide sleeve near the end of the shell cover, and the wall thickness of the shell cover is less than that of the inner wall of the guide sleeve.

[0014] This design saves on material for the shell.

[0015] In one embodiment, the guide sleeve and the shell cover are welded together.

[0016] This design strengthens the connection and enhances the sealing effect between the guide sleeve and the cover.

[0017] In one embodiment, the connecting plate and the housing assembly, and the guide sleeve and the housing cover are connected by laser welding.

[0018] In one embodiment, the outer side of the guide sleeve is provided with external threads, the inner wall of the valve seat is provided with internal threads, and the guide sleeve and the valve seat are threadedly connected.

[0019] This design makes disassembly and assembly convenient.

[0020] In one embodiment, a sealing groove is provided on the outer side of the guide sleeve, and a sealing element is provided in the sealing groove. The sealing element abuts against the inner wall of the valve seat, and the sealing groove is located close to the cover relative to the external thread.

[0021] This design enhances the sealing between the guide sleeve and the valve seat.

[0022] In one embodiment, the step is annular, the connecting plate is disc-shaped, and the connecting plate is interference-fitted with the step.

[0023] With this design, the connecting plate can be pressed into the step at any angle during installation, thus improving the ease of installation.

[0024] In one embodiment, the outer side of the connecting plate is provided with a plurality of evenly distributed protrusions, which are interference-fitted with the inner wall of the housing assembly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the installation structure of the connecting plate provided in one embodiment of this utility model;

[0027] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0028] Figure 3 A schematic diagram of the mounting structure of the connecting plate provided in another embodiment;

[0029] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0030] Figure 5 This is a 3D view of the connecting plate;

[0031] Figure 6 This is a cross-sectional view of an electronic expansion valve.

[0032] Figure 7 This is a schematic diagram of the structure when the limiting rod and the limiting hole are engaged.

[0033] Reference numerals: 100, Electronic expansion valve; 10, Valve seat; 11, First port; 12, Second port; 13, Valve port; 20, Housing assembly; 21, Step; 22, Housing cover; 221, Opening; 222, Terminal block; 2221, Glue potting groove; 2222, Terminal pin; 23, Guide sleeve; 231, External thread; 232, Sealing groove; 233, Seal; 234, Limiting rod; 24, First groove; 25, Second groove; 26, First cavity; 30, Motor; 31, Gear; 40, Connecting plate; 41, Protrusion; 50, Piston assembly; 51, Screw; 52, Bearing; 53, Positioning cylinder; 531, Positioning sleeve; 532, Valve head; 533, Nut seat; 534, Positioning plate; 5341, Limiting hole. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0035] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0039] This utility model provides an electronic expansion valve 100 for controlling the flow rate of a medium. It is typically used in refrigeration systems and installed before the evaporator. By controlling the flow rate, the state of the medium flowing into the evaporator can be regulated.

[0040] Specifically, the electronic expansion valve 100 includes a valve seat 10, a housing assembly 20, a motor 30, and a connecting plate 40. The housing assembly 20 is connected to the valve seat 10. The motor 30 and the connecting plate 40 are disposed within the housing assembly 20. The motor 30 is mounted on the connecting plate 40. The housing assembly 20 has a step 21. The connecting plate 40 is press-fitted onto the step 21 and welded to the housing assembly 20. This invention strengthens the installation strength of the connecting plate 40 by first press-fitting it onto the step 21 and then welding it to the housing assembly 20, thereby further ensuring the operational stability of the motor 30.

[0041] The valve seat 10 has a first port 11 and a second port 12, and the valve seat 10 has a valve port 13 inside, and the first port 11 and the second port 12 are connected through the valve port 13.

[0042] The housing assembly 20 includes a housing cover 22 and a guide sleeve 23. One end of the guide sleeve 23 extends into the valve seat 10 and is sealed to the valve seat 10, while the other end is welded to the housing cover 22, thereby strengthening the connection between the housing cover 22 and the guide sleeve 23. The guide sleeve 23 is located inside the housing cover 22.

[0043] Preferably, the cover 22 and the guide sleeve 23 are fixedly connected by laser welding to improve assembly efficiency and reduce thermal deformation of the cover 22 and the guide sleeve 23.

[0044] Please see Figure 1 and Figure 2 In one embodiment, a step 21 is provided on the inner wall of the guide sleeve 23 near the end of the housing cover 22. A connecting plate 40 is spaced apart from the housing cover 22 near the side of the motor 30. The wall thickness of the housing cover 22 is less than the wall thickness of the guide sleeve 23. During installation, the connecting plate 40 is first pressed onto the step 21 and then welded to the step 21. Subsequently, the guide sleeve 23 and the housing cover 22 are welded together. This allows for a smaller wall thickness of the housing cover 22, thus saving material. In this embodiment, the gap between the connecting plate 40 and the guide sleeve 23 is fixed by laser welding.

[0045] In another embodiment, a step 21 is provided on the inner wall of one end of the housing cover 22, and the side of the connecting plate 40 away from the motor 30 is spaced apart from the guide sleeve 23. During installation, the connecting plate 40 is first pressed into the step 21, then the connecting plate 40 is welded, and then the guide sleeve 23 and the housing cover 22 are welded together. In this embodiment, the connection and fixation are achieved by laser welding through the gap between the connecting plate 40 and the housing cover 22.

[0046] Please see Figure 3 and Figure 4In another embodiment, step 21 is provided on the end face of guide sleeve 23 near motor 30. At least part of the side of connecting plate 40 near motor 30 abuts against the end face of housing 22. During installation, connecting plate 40 is first pressed onto step 21, and then the end face of housing 22 is aligned with the end face of guide sleeve 23. At this time, part of connecting plate 40 abuts against the end face of housing 22. During welding, welding is performed directly on the gap between the end faces of housing 22 and guide sleeve 23, allowing direct welding and fixing of connecting plate 40 and housing 22. In this embodiment, laser welding is used for fixing.

[0047] In another embodiment, step 21 is provided on the end face of the cover 22 near the guide sleeve 23. The side of the connecting plate 40 away from the motor 30 at least partially abuts against the end face of the guide sleeve 23. During installation, the connecting plate 40 is first pressed onto step 21, and then the end face of the cover 22 is aligned with the end face of the guide sleeve 23. At this time, part of the connecting plate 40 abuts against the end face of the guide sleeve 23. During welding, welding is performed directly on the gap between the end faces of the cover 22 and the guide sleeve 23, thus directly welding and fixing the connecting plate 40 and the guide sleeve 23. Similarly, in this embodiment, laser welding is used for fixing.

[0048] In one embodiment, the step 21 is annular, and the connecting plate 40 is disc-shaped. The outer wall of the connecting plate 40 is press-fitted into the step 21. This configuration allows the connecting plate 40 to be pressed into the step 21 at any angle during installation, thus improving ease of installation. In another embodiment, please refer to... Figure 5 The outer side of the connecting plate 40 is provided with a plurality of evenly distributed protrusions 41, which are interference fit with the inner wall of the cover 22 or the guide sleeve 23.

[0049] The outer side of one end of the guide sleeve 23 is provided with an external thread 231, and the inner wall of the valve seat 10 is provided with an internal thread (not shown in the figure). The guide sleeve 23 and the valve seat 10 are connected by the mating of the external thread 231 and the internal thread, which improves the ease of installation.

[0050] A sealing groove 232 is formed on the inner wall of the guide sleeve 23 at the end opposite the external thread 231 that is close to the cover 22. A sealing element 233 is provided in the sealing groove 232. The sealing element 233 abuts against the inner wall of the valve seat 10, so that the guide sleeve 23 and the valve seat 10 are sealed together. The sealing element 233 can be a gasket or an O-ring.

[0051] The end of the cover 22 away from the guide sleeve 23 has an opening 221. A terminal block 222 is provided in the opening 221. The motor 30 has a lead wire (not shown in the figure). A connector pin 2222 is passed through the terminal block 222. One end of the connector pin 2222 extends into the terminal block 222 and is soldered to the lead wire. The other end extends out of the terminal block 222 for connecting to an external power source.

[0052] The terminal block 222 has a potting groove 2221 at the end facing the motor 30. The lead wire and the connector pin 2222 are soldered together in the potting groove 2221. The potting groove 2221 is filled with insulating glue to prevent the connector pins 2222 from touching each other and causing a short circuit.

[0053] Preferably, the insulating adhesive is epoxy adhesive, which is inexpensive, and the lead wire and the connector 2222 are connected by soldering.

[0054] The electronic expansion valve 100 also includes a piston assembly 50. A gear 31 is provided on the output shaft of the motor 30. One end of the output shaft of the motor 30 passes through the connecting plate 40 and extends out of the housing cover 22. The gear 31 is located at the end of the output shaft of the motor 30 that extends out of the housing cover 22. The piston assembly 50 is connected to the gear 31, which drives the piston assembly 50 to rotate. Some parts of the piston assembly 50 convert circumferential motion into axial motion, thereby controlling the flow rate of the valve port 13.

[0055] Please see Figure 6 and Figure 7 The piston assembly 50 includes a screw 51, a bearing 52, and a positioning cylinder 53. A gear 31 is fixedly connected to the inner ring of the bearing 52 facing the surface of the cover 22. A guide sleeve 23 has a first groove 24 and a second groove 25 at both ends facing the cover 22. A connecting plate 40 covers the opening of the first groove 24, forming a first cavity 26. The gear 31 is located in the first cavity 26 and connected to the screw 51 via the bearing 52. The positioning cylinder 53 is partially located in the second groove 25 and can slide within it. The end of the screw 51 furthest from the motor 30 is threadedly connected to the positioning cylinder 53. Rotation of the gear 31 drives the screw 51 to rotate. Because the positioning cylinder 53 is restricted by circumferential rotation, circumferential rotation becomes axial rotation. The movement of the positioning cylinder 53 controls the flow rate of the valve port 13.

[0056] The positioning cylinder 53 includes a positioning sleeve 531, a valve head 532, and a nut seat 533. The positioning sleeve 531 is slidably connected to the groove wall of the second groove 25. The valve head 532 is located at one end of the positioning sleeve 531 near the valve port 13. The nut seat 533 is located inside the positioning sleeve 531. The screw 51 extends into the positioning sleeve 531 and is threadedly connected to the nut seat 533.

[0057] In one embodiment, the positioning sleeve 531 and the valve head 532 are threaded together for easy installation. In other embodiments, the positioning sleeve 531 and the valve head 532 can also be fixedly connected by snap-fit, welding, or other methods.

[0058] The positioning cylinder 53 also includes a positioning piece 534, which is located on the end face of the positioning sleeve 531 away from the valve port 13. The screw 51 passes through the positioning piece 534, and the positioning piece 534 and the screw 51 are spaced apart to prevent the screw 51 from rotating and rubbing against the positioning piece 534.

[0059] The positioning plate 534 has a limiting hole 5341, and the guide sleeve 23 is provided with a limiting rod 234, which passes through the limiting hole 5341. Since the guide sleeve 23 is fixed, the cooperation between the limiting rod 234 and the limiting hole 5341 can restrict the circumferential rotation of the positioning cylinder 53, thereby allowing the positioning cylinder 53 to move axially. Furthermore, since the limiting rod 234 passes through the limiting hole 5341, the positioning sleeve 531 can move along the limiting rod 234, and the limiting rod 234 plays a guiding role.

[0060] In one embodiment, the piston assembly 50 and the housing assembly 20 are inclined, that is, the axes of the piston assembly 50 and the housing assembly 20 are inclined relative to the axes of the first port 11 and the second port 12, which can reduce the height of the electronic expansion valve 100 and make the electronic expansion valve 100 of this application suitable for scenarios with height requirements.

[0061] This utility model strengthens the connection by setting a step 21 in the housing assembly 20, first pressing the connecting plate 40 onto the step 21 for pre-positioning, and then welding the connecting plate 40 to the housing assembly 20. That is, the connecting plate 40 can be welded to the housing cover 22, and then the housing cover 22 and the guide sleeve 23 can be welded; or the connecting plate 40 can be welded to the guide sleeve 23, and then the housing cover 22 and the guide sleeve 23 can be welded; or the connecting plate 40 can be pressed onto the guide sleeve 23, and the housing cover 22 can be welded to both the guide sleeve 23 and the connecting plate 40; or the connecting plate 40 can be pressed onto the housing cover 22, and the guide sleeve 23 can be welded to both the connecting plate 40 and the housing cover 22.

[0062] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any appropriate changes and variations made to the above embodiments within the scope of the essential spirit of the present utility model shall fall within the scope of protection claimed by the present utility model.

Claims

1. An electronic expansion valve comprising a valve seat (10), a housing assembly (20), a motor (30) and a connecting plate (40), one end of the housing assembly (20) being sealingly connected with the valve seat (10), the motor (30) and the connecting plate (40) being arranged in the housing assembly (20), and the motor (30) being mounted on the connecting plate (40). characterized in that A step (21) is arranged in the housing assembly (20), the connecting plate (40) being press-fitted in the step (21) and being welded and fixed with the housing assembly (20).

2. The electronic expansion valve according to claim 1, characterized in that The housing assembly (20) comprises a cover (22) and a guide sleeve (23), one end of the guide sleeve (23) being connected with the valve seat (10) and the other end being connected with the cover (22), and the motor (30) being arranged in the cover (22). The step (21) is arranged on the end face of the cover (22) close to one end of the guide sleeve (23), and the side of the connecting plate (40) away from the motor (30) abuts against the end face of the guide sleeve (23).

3. The electronic expansion valve according to claim 1, wherein The housing assembly (20) comprises a cover (22) and a guide sleeve (23), one end of the guide sleeve (23) being connected with the valve seat (10) and the other end being connected with the cover (22), and the motor (30) being arranged in the cover (22). The step (21) is arranged on the end face of the guide sleeve (23) close to one end of the cover (22), and the side of the connecting plate (40) close to the motor (30) abuts against the end face of the cover (22).

4. The electronic expansion valve according to claim 1, wherein The housing assembly (20) comprises a cover (22) and a guide sleeve (23), one end of the guide sleeve (23) being connected with the valve seat (10) and the other end being connected with the cover (22), and the motor (30) being arranged in the cover (22). The step (21) is arranged on the inner wall of the guide sleeve (23) close to one end of the cover (22), and the wall thickness of the cover (22) is smaller than the inner wall of the guide sleeve (23).

5. The electronic expansion valve according to any one of claims 2 to 4, characterized in that The guide sleeve (23) and the cover (22) are welded and connected.

6. The electronic expansion valve according to claim 5, wherein The connecting plate (40) and the housing assembly (20), and the guide sleeve (23) and the cover (22) are connected by laser welding.

7. The electronic expansion valve according to any one of claims 2 to 4, characterized in that An external thread (231) is arranged on the outer side of the guide sleeve (23), and an internal thread is arranged on the inner wall of the valve seat (10), and the guide sleeve (23) and the valve seat (10) are threadedly connected.

8. The electronic expansion valve according to claim 7, characterized in that A sealing groove (232) is arranged on the outer side of the guide sleeve (23), a sealing element (233) is arranged in the sealing groove (232), the sealing element (233) abuts against the inner wall of the valve seat (10), and the sealing groove (232) is arranged close to the cover (22) relative to the external thread (231).

9. The electronic expansion valve of claim 1, wherein, The step (21) is in the shape of a circular ring, the connecting plate (40) is in the shape of a disc, and the outer side of the connecting plate (40) is in interference fit with the inner wall of the housing assembly (20).

10. The electronic expansion valve according to claim 1, wherein The connecting plate (40) is provided with a plurality of uniformly distributed protrusions (41) on the outer side, and the protrusions (41) are in interference fit with the inner wall of the shell assembly (20).

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