Electronic expansion valve and refrigerating system thereof

Abstract

The utility model relates to the technical field of refrigerating systems, in particular to an electronic expansion valve and a refrigerating system thereof. The electronic expansion valve comprises a shell and a valve body, a waterproof part is arranged at the bottom of the shell, and the waterproof part is hollow to form an opening; the valve body extends into the opening and is connected with the waterproof part; wherein a first connecting part is formed between the waterproof part and the valve body, the waterproof part is provided with a lower edge far away from the shell, and the first connecting part is located on the side, close to the shell, of the lower edge in the axial direction of the valve body. The waterproof valve has the advantages that the circumferential connection between the valve body and the inner wall of the opening of the waterproof part improves the connection tightness of the valve body and the waterproof part, and the lower edge is located below the first connection part, so that liquid is difficult to enter the shell from a gap between the valve body and the waterproof part, and the waterproof part can play a waterproof role; and structures such as a sealing ring are not needed to help sealing, so that the processing steps and the structure are simplified, and the cost is reduced.

Description

Technical Field

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

[0002] An electronic expansion valve typically includes a coil assembly and a valve body. The coil assembly includes a coil and a housing disposed outside the coil to protect it. The valve body typically includes a sleeve and a valve seat connected by welding. The sleeve and valve seat form an integral unit and are connected to the coil assembly.

[0003] However, in existing electronic expansion valves, the welded parts of the valve body, sleeve, and valve seat are directly exposed to the air, making them susceptible to rainwater and causing problems such as weld corrosion. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an electronic expansion valve.

[0005] An electronic expansion valve includes: a coil component having a housing, the bottom of the housing having a waterproof portion, the waterproof portion being hollow to form an opening; a valve body extending into the opening and connected to the coil component; the valve body having a sleeve and a valve seat, the sleeve and the valve seat being fixedly connected, the connection portion of the sleeve and the valve seat forming a first connection portion; the projection of the first connection portion in the radial direction intersects with the waterproof portion.

[0006] With this configuration, the connection point between the valve seat and the sleeve, i.e., the first connection part, is located within the coverage area of ​​the waterproof part. The waterproof part completely covers the circumferential outer side of the first connection part, making it difficult for liquid to enter the housing through the gap between the valve body and the waterproof part. Therefore, the waterproof part effectively prevents the first connection part from contacting moisture, ensuring the connection strength and service life of the valve seat and the sleeve. Furthermore, there is no need to install sealing rings or other structures to aid sealing, thereby simplifying the processing steps and structure, and reducing costs.

[0007] In one embodiment, the valve seat has a step at one end near the sleeve, the sleeve abuts against the step and is connected by welding, and the step and the part where the sleeve and the step abut against each other form the first connection part.

[0008] In one embodiment, the valve seat and the sleeve are connected by laser welding.

[0009] In one embodiment, at least a portion of the valve body is clearance-fitted with the inner wall of the waterproof portion, and the clearance L < 0.05 mm.

[0010] In one embodiment, the waterproof portion extends axially along the housing and has a lower edge away from the housing, with the first connecting portion located above the lower edge.

[0011] In one embodiment, the lower edge is configured as a planar structure or an arc-shaped structure.

[0012] In one embodiment, a connecting pipe is connected to the valve body, and the lower edge has an arc-shaped structure, the arc-shaped structure including a convex section and a concave section, the concave section being matched with the connecting pipe for limiting.

[0013] In one embodiment, the housing is provided with a snap-fit ​​plate;

[0014] The snap-fit ​​plate has a groove on the side facing the valve body, and a protrusion is provided on the outer periphery of the valve body, the protrusion engaging with the groove; or...

[0015] The snap-fit ​​plate has a protrusion on the side facing the valve body, and the outer peripheral side of the valve body has a groove, and the protrusion engages with the groove.

[0016] In one embodiment, there are multiple snap-fit ​​plates, which are arranged at intervals along the circumference of the housing.

[0017] In one embodiment, the housing includes an upper waterproof shell, a lower waterproof shell, and an annular body, with the bottom of the housing located at the lower waterproof shell, and the lower waterproof shell being provided with the waterproof portion.

[0018] In one embodiment, the coil component has a stator assembly, an upper waterproof housing covering the upper part of the stator assembly, a lower waterproof housing covering the lower part of the stator assembly, and an annular gap formed between the upper and lower waterproof housings; the annular body is formed of material injected into the annular gap and into the assembly gap of the stator assembly.

[0019] In one embodiment, the coil component has a stator assembly, and the upper waterproof shell, the lower waterproof shell, and the annular body are integrally injection molded with the stator assembly as an insert.

[0020] This utility model also provides a refrigeration system, including the electronic expansion valve as described above.

[0021] Compared to existing technologies, this invention protects the connection between the valve seat and the sleeve by incorporating a waterproof section. The first connection portion is located within the coverage area of ​​the waterproof section, which completely covers the circumferential outer side of the first connection portion. Liquid is unlikely to enter the housing through the gap between the valve body and the waterproof section, thus achieving a waterproof effect and preventing the first connection portion from contacting moisture, ensuring the connection strength and service life of the valve seat and sleeve. Furthermore, it eliminates the need for sealing rings or other structures to aid sealing, thereby simplifying the processing steps and structure, and reducing costs. Attached Figure Description

[0022] Figure 1 A schematic diagram of one embodiment of the electronic expansion valve provided by this utility model;

[0023] Figure 2 A schematic diagram of the structure of one embodiment of the housing of the electronic expansion valve provided by this utility model;

[0024] Figure 3 A schematic diagram of another embodiment of the electronic expansion valve provided by this utility model;

[0025] Figure 4 A cross-sectional view of the electronic expansion valve provided by this utility model;

[0026] Figure 5 for Figure 4 A magnified view of section A in the image.

[0027] The symbols in the diagram represent the following meanings:

[0028] 100. Electronic expansion valve; 10. Housing; 11. Waterproof part; 111. Opening; 112. Lower edge; 1121. Raised section; 1122. Recessed section; 12. Upper waterproof housing; 13. Annular body; 14. Lower waterproof housing; 20. Valve body; 21. Sleeve; 22. Valve seat; 221. Step; 23. Protrusion; 24. Snap-fit ​​plate; 25. First connecting part; 30. Connecting pipe; 40. Stator assembly. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly 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," "over," and "on top" 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.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figures 1-5 This utility model provides an electronic expansion valve 100, which has a waterproof part 11 on the housing 10 to protect the first connection part 25 from the influence of water vapor in the external environment.

[0035] Please see Figures 1-3The electronic expansion valve 100 includes a coil component and a valve body 20. The coil component has a housing 10, and the bottom of the housing 10 is provided with a waterproof portion 11. The waterproof portion 11 is hollow to form an opening 111. The valve body 20 extends into the opening 111 and is connected to the coil component. The valve body 20 includes a sleeve 21 and a valve seat 22, and the valve seat 22 is provided with a valve port. The sleeve 21 and the valve seat 22 are fixedly connected, and the connection part of the sleeve 21 and the valve seat 22 forms a first connection portion 25. The projection of the first connection portion 25 in the radial direction intersects with the waterproof portion 11.

[0036] It should be explained that the projection of the first connecting part 25 in the radial direction means that the connecting area of ​​the first connecting part 25 is projected outward along the radial direction away from the axis of the valve body 20. This projection is located on the inner wall of the waterproof part 11, so the first connecting part 25 is completely covered by the waterproof part.

[0037] Preferably, the first connecting portion can form a plane in the radial direction. The intersection of this plane with the waterproof portion 11 means that the plane extends outward on its horizontal plane and its extension path passes through the waterproof portion 11. That is, if the plane does not intersect with the waterproof portion 11, that is, the plane is located below the waterproof portion 11 and is spaced apart. The aforementioned intersection means that the first connecting portion 25 is completely within the coverage area of ​​the waterproof portion 11.

[0038] With this configuration, the connection position between the valve seat 22 and the sleeve 21, i.e., the first connection part 25, is located within the coverage area of ​​the waterproof part 11. The waterproof part 11 can completely cover the outer circumferential side of the first connection part 25, preventing the first connection part 25 from contacting water droplets or rainwater, and ensuring the connection strength and service life of the valve seat 22 and the sleeve 21.

[0039] In another embodiment of this application (not shown), the valve seat 22 has a first valve seat and a second valve seat that are separately configured. The second valve seat is provided with a valve port. The valve port and the second valve seat can be separately configured or integrally configured. The first valve seat is disposed between the sleeve 21 and the second valve seat, and one end of the first valve seat is fixedly connected to the second valve seat, and the other end is fixedly connected to the sleeve 21. A first connecting portion 25 is formed between the sleeve 21 and the first valve seat. The first valve seat and the second valve seat can also be integrally configured.

[0040] The housing 10 is used to protect the coil disposed therein, while the valve body 20 extends into the housing 10 from the opening 111 and is fixedly connected to the coil component.

[0041] Specifically, a step 221 is provided at one end of the valve seat 22 near the sleeve 21. The sleeve 21 abuts against the step 221 and is connected by welding. The step 221 and the part where the sleeve 21 and the step 221 abut against each other form the first connection part 25 mentioned above. The step 221 increases the contact area between the valve seat 22 and the sleeve 21 and can play a role in pre-positioning, so that welding can be performed after the contact is made.

[0042] Understandably, in other embodiments, the step 221 can also be provided on the sleeve 21, and can also achieve the above-mentioned technical effects.

[0043] Specifically, in this embodiment, the valve seat 22 and the sleeve 21 are connected by laser welding, which is fast, efficient, and produces a smooth weld with good quality. In other embodiments, argon arc welding or resistance welding can also be used.

[0044] Furthermore, at least a portion of the valve body 20 is fitted with the inner wall of the waterproof part 11 with a clearance of L < 0.05 mm. This makes the installation of the valve body 20 more convenient and facilitates subsequent maintenance. The clearance of < 0.05 mm prevents moisture from entering the interior of the housing 10 through the gap, and eliminates the need for additional sealing rings or other structures to aid sealing, simplifying the manufacturing process and reducing costs.

[0045] Understandably, in other embodiments, the valve body 20 and the waterproof part 11 may also be configured to be interference fit, thereby further improving their sealing performance.

[0046] Preferably, in this embodiment, the outer diameters of the sleeve 21 and the valve seat 22 are the same. Therefore, along the axial direction of the valve body 20, the outer diameter of the valve body 20 remains constant from one end to the other, which facilitates processing and assembly. In other embodiments, the outer diameters of the sleeve 21 and the valve seat 22 can also be set to be different to simplify the processing difficulty and reduce the process requirements.

[0047] Furthermore, the waterproof portion 11 extends axially along the housing 10 and has a lower edge 112 away from the housing 10, with the first connecting portion 25 located above the lower edge 112. Therefore, the waterproof portion 11 can completely cover the outside of the first connecting portion 25, reducing the contact of moisture with the first connecting portion 25.

[0048] In one embodiment, the lower edge 112 is configured as a planar structure or an arc-shaped structure. When configured as a planar structure, it is easier to process and the structure is more organized, facilitating the installation of other components. When configured as an arc-shaped structure, it has higher structural strength, is more aesthetically pleasing, and helps guide the flow and dripping of liquid, preventing liquid stagnation.

[0049] Furthermore, the lower edge 112, configured as an arc-shaped structure, includes a convex section 1121 and a concave section 1122, with the concave section 1122 engaging with the connecting pipe 30. Thus, the connecting pipe 30 is confined within the recess formed by the concave section 1122 and abuts against the convex section 1121. Therefore, the lower edge 112 can stop the circumferential rotation of the connecting pipe 30, thereby limiting the circumferential rotation of the valve body 20 and making its installation more stable.

[0050] A snap-fit ​​plate 24 is provided on the lower edge 112. The snap-fit ​​plate 24 has a groove (not shown in the figure) on the side facing the valve body 20. A protrusion 23 protrudes from the outer periphery of the valve body 20, and the protrusion 23 engages with the groove. In this way, the contact between the snap-fit ​​plate 24 and the protrusion 23 further ensures the installation stability of the valve body 20. It also prevents the valve body 20 from tilting, resulting in higher concentricity.

[0051] In another embodiment, the protrusion 23 can also be provided on the side of the snap-fit ​​plate 24 facing the valve body 20, and the outer peripheral side of the valve body 20 is provided with a corresponding groove, so that the protrusion 23 and the groove can also be snapped together.

[0052] Furthermore, multiple snap-fit ​​plates 24 are provided, spaced apart along the circumference of the waterproof section 11. This spaced arrangement of snap-fit ​​plates 24 facilitates deformation during valve body 20 installation, thus simplifying the assembly of the housing 10 and the valve body 20. The spaced snap-fit ​​plates 24 can also engage with the connecting pipe 30 attached to the valve body 20, limiting the circumferential rotation of the valve body 20. In addition, the circumferential contact eliminates the need for rotation to align the housing 10 and valve body 20 circumferentially, facilitating assembly. The snap-fit ​​design using protrusions 23 and grooves results in a simple structure.

[0053] Preferably, each snap-fit ​​plate 24 has a groove, and the extending plane formed by the groove on each snap-fit ​​plate 24 is perpendicular to the axis of the housing 10. The extending plane of the protrusion 23 is perpendicular to the axis of the valve body 20. It should be explained that the extending plane formed by the groove on each snap-fit ​​plate 24 refers to a plane that can pass through the groove on each snap-fit ​​plate 24, and this plane is perpendicular to the axis of the housing 10. That is, all grooves are formed on the same plane and are all perpendicular to the axis of the housing 10. If the axis of the housing 10 is defined as the vertical direction, then the extending direction of the groove is the horizontal direction. Similarly, the annular structure formed by the protrusion 23 also forms a plane perpendicular to the axis of the valve body 20. If the axis of the valve body 20 is defined as extending in the vertical direction, then the protrusion 23 can extend in the horizontal direction.

[0054] Of course, in other embodiments, the grooves do not necessarily have to be on the same horizontal line; they only need to be able to fit with the protrusion 23. For example, the groove at a higher position in the vertical direction corresponds to the fitting protrusion 23, while the groove at a lower position in the vertical direction corresponds to the fitting lower protrusion 23 for locking and limiting. The above solution is only a preferred embodiment.

[0055] Along the circumference of the housing 10, the snap-fit ​​plate 24 is set to be arc-shaped, and the curvature is adapted to the edge of the opening 111 to facilitate processing and improve the overall structure, thereby reducing interference between the snap-fit ​​plate 24 and other structures.

[0056] In another embodiment, the lower edge 112 of the waterproof part 11 is set as a plane, thereby facilitating the forming or installation of the aforementioned snap-fit ​​plates 24.

[0057] In addition, the coil component also includes a stator assembly 40, which is disposed within the housing 10 and covers at least a portion of the outer surface of the stator assembly 40. A waterproof portion 11 is provided below the housing 10. The housing 10 and the waterproof portion 11 can be an integral structure or separate structures. The stator assembly comprises a stator housing, stator plates, and windings.

[0058] The housing includes an upper waterproof shell 12, a lower waterproof shell 14, and an annular body 13. The bottom of the housing 10 is located at the lower waterproof shell 14, and the lower waterproof shell 14 is provided with a waterproof part 11.

[0059] Furthermore, the upper waterproof shell 12 covers the upper part of the stator assembly 40, and the lower waterproof shell 14 covers the lower part of the stator assembly 40. An annular gap is formed between the upper waterproof shell 12 and the lower waterproof shell 14. The annular body 13 is formed by material injected into the annular gap and the assembly gap of the stator assembly 40. The annular body is injection molded as an insert by the upper waterproof shell 12, the lower waterproof shell 14 and the stator assembly 40, which can facilitate the positioning of the stator assembly 40 in the mold during injection molding, and at the same time relieve the injection pressure.

[0060] The upper waterproof shell 12, the lower waterproof shell 14, and the annular body 13 are integrally injection molded with the stator assembly 40 as an insert, which facilitates production.

[0061] This utility model also provides a refrigeration system, including the electronic expansion valve 100 as described above.

[0062] Compared to existing technologies, this invention protects the connection between the valve seat 22 and the sleeve 21 by providing a waterproof section 11. The first connecting part 25 is located within the coverage area of ​​the waterproof section 11, which completely covers the outer circumference of the first connecting part 25, thus isolating it from water droplets or rainwater. Furthermore, there is a gap of less than 0.05mm between the valve body 20 and the inner wall of the waterproof section 11, preventing moisture from entering through this gap. Therefore, the waterproof section 11 effectively prevents water from contacting the first connecting part 25, ensuring the connection strength and service life of the valve seat 22 and the sleeve 21. Moreover, it eliminates the need for sealing rings or other structures to aid sealing, simplifying the processing steps and structure, and reducing costs.

[0063] The technical features of the above 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.

[0064] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electronic expansion valve, characterized in that, include: A coil component having a housing (10) with a waterproof portion (11) at the bottom of the housing (10), the waterproof portion (11) being hollow to form an opening (111); The valve body (20) extends into the opening (111) and is connected to the coil component; The valve body (20) includes a sleeve (21) and a valve seat (22). The sleeve (21) and the valve seat (22) are fixedly connected. The connection between the sleeve (21) and the valve seat (22) forms a first connection part (25). The projection of the first connection part (25) in the radial direction intersects with the waterproof part (11).

2. The electronic expansion valve according to claim 1, characterized in that, The valve seat (22) has a step (221) at one end near the sleeve (21). The sleeve (21) abuts against the step (221) and is connected by welding. The step (221) and the part where the sleeve (21) and the step (221) abut against each other form the first connection part (25).

3. The electronic expansion valve according to claim 2, characterized in that, The valve seat (22) and the sleeve (21) are connected by laser welding.

4. The electronic expansion valve according to claim 1, characterized in that, At least part of the valve body (20) is clearance-fitted with the inner wall of the waterproof part (11), and the clearance L < 0.05 mm.

5. The electronic expansion valve according to claim 1, characterized in that, The waterproof portion (11) extends along the axial direction of the housing (10), and the waterproof portion (11) has a lower edge (112) away from the housing (10), and the first connecting portion (25) is located above the lower edge (112).

6. The electronic expansion valve according to claim 5, characterized in that, The lower edge (112) is configured as a planar structure or an arc-shaped structure.

7. The electronic expansion valve according to claim 6, characterized in that, The valve body (20) is connected to a connecting pipe (30), and the lower edge (112) has an arc-shaped structure, which includes a convex section (1121) and a concave section (1122). The concave section (1122) is in a limiting fit with the connecting pipe (30).

8. The electronic expansion valve according to claim 1, characterized in that, A snap-fit ​​plate (24) is provided on the housing (10); The snap-fit ​​plate (24) has a groove on the side facing the valve body (20), and a protrusion (23) protrudes from the outer periphery of the valve body (20), the protrusion (23) engaging with the groove; or, The snap-fit ​​plate (24) has a protrusion (23) on the side facing the valve body (20), and the outer periphery of the valve body (20) has a groove, and the protrusion (23) snaps into the groove.

9. The electronic expansion valve according to claim 8, characterized in that, There are multiple snap-fit ​​plates (24), and the multiple snap-fit ​​plates (24) are arranged at intervals along the circumference of the housing (10).

10. The electronic expansion valve according to claim 1, characterized in that, The housing (10) includes an upper waterproof shell (12), a lower waterproof shell (14) and an annular body (13). The bottom of the housing (10) is located at the lower waterproof shell (14), and the lower waterproof shell (14) is provided with the waterproof part (11).

11. The electronic expansion valve according to claim 10, characterized in that, The coil component has a stator assembly (40), the upper waterproof shell (12) covers the upper part of the stator assembly (40), and the lower waterproof shell (14) covers the lower part of the stator assembly (40), with an annular gap formed between the upper waterproof shell (12) and the lower waterproof shell (14); the annular body (13) is formed of material injected into the annular gap and into the assembly gap of the stator assembly (40).

12. The electronic expansion valve according to claim 10, characterized in that, The coil component has a stator assembly (40), and the upper waterproof shell (12), the lower waterproof shell (14), and the annular body (13) are integrally injection molded with the stator assembly (40) as an insert.

13. A refrigeration system, characterized in that, Includes the electronic expansion valve as described in any one of claims 1-9.

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