Protection device for valve for refrigerant flow

Abstract

The present application provides a protection device for a valve for refrigerant flow. The protection device for a valve for refrigerant flow comprises a valve cover, a sleeve, and a chamber isolated from the outside. A first gap is formed between the valve cover and the sleeve, one end of the first gap is communicated with the chamber, and the other end of the first gap is communicated with the external environment. After the valve cover is welded to the sleeve, a first welding seam is formed in at least part of the first gap; and first glue fills at least part of the first gap via the other end of the first gap, and the first glue isolates the first welding seam from the outside.

Description

Protective devices for valves used in refrigerant flow

[0001] Cross-references

[0002] This disclosure claims priority to Chinese Patent Application No. 202520171940.0, filed on January 24, 2025, entitled “Protective Device for a Valve for Refrigerant Flow,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of valve technology, and in particular to a protection device for a valve used for refrigerant flow. Background Technology

[0004] Valves such as solenoid valves and electronic expansion valves all consist of a valve cover, a valve seat, and a sleeve. During installation, the sleeve and valve cover are welded together axially. However, there are instances where the welds are not secure, resulting in insufficient fixing strength between the sleeve and the valve cover. Summary of the Invention

[0005] According to one aspect of this application, a protective device for a valve for refrigerant flow is provided, comprising a valve cover, a sleeve, and a chamber isolated from the outside. A first gap exists between the valve cover and the sleeve; the valve cover and the sleeve form part of the wall of the chamber; after welding the valve cover and the sleeve, a first weld is formed within at least a portion of the first gap; the first gap between the valve cover and the sleeve is also filled with a first adhesive. Attached Figure Description

[0006] The various objectives, features, and advantages of this application will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of this application and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0007] Figure 1 is a schematic diagram of the protection device and valve for the refrigerant flow valve of this application.

[0008] Figure 2 is a top view of Figure 1.

[0009] Figure 3 is a cross-sectional view AA of Figure 2.

[0010] Figure 4 is an enlarged schematic diagram of point I in Figure 3.

[0011] Figure 5 is a three-dimensional structural diagram of the structure in Figure 1 after being cut along AA in Figure 2 (without glue).

[0012] The reference numerals in the attached drawings are explained as follows: 1-Valve; 10-Valve cover; 20-Sleeve; 21-First mating section; 22-Second mating section; 23-Third mating section; 30-Valve seat; 40-First weld; 50-First adhesive; 60-Second adhesive; 70-Cavity; 101-Through hole; 101a-First section; 101b-Second section; 101c-Third section; 102-First gap; 201-First groove; 202-Second groove; 301-Stepped hole; 302-Second gap. Detailed Implementation

[0013] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0014] In the following description of various exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form part of the present disclosure, and in which different exemplary structures, systems, and steps that may implement various aspects of the present disclosure are shown by way of example. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the present disclosure. Furthermore, while the terms “above,” “between,” “within,” etc., may be used in this specification to describe different exemplary features and elements of the present disclosure, these terms are used herein for convenience only, such as the orientation according to the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present disclosure.

[0015] It is understood that the terms "comprising" and "having," and any variations thereof, used in the embodiments of this disclosure, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to such processes, methods, products, or apparatus.

[0016] Relative terms such as “down” or “bottom” and “up” or “top” may be used herein to describe the relationship of one element to another, as illustrated in the figures. It should be understood that relative terms are intended to include different orientations of the device beyond those shown in the figures. For example, if a device in one of the figures is flipped, an element described as “down” or “bottom” of another element will be oriented “up” or “top” of that element. Thus, the exemplary term “down” can include both “down” and “up” orientations, and the term “bottom” can include both “bottom” and “top” orientations, depending on the specific orientation of the figure. Similarly, if a device in one of the figures is flipped, an element described as “down” or “bottom” of another element will be oriented “up” or “top” of that element. Thus, the exemplary term “bottom” or “below” can include both “up” and “down” orientations.

[0017] Referring to Figures 1 to 5, this application provides a valve 1, wherein the valve 1 includes a protection device for a valve for refrigerant flow. The protection device for the valve for refrigerant flow includes a valve cover 10, a sleeve 20, and a chamber 70 isolated from the outside. A first gap 102 is provided between the valve cover 10 and the sleeve 20. One end of the first gap 102 communicates with the chamber 70, and the other end communicates with the external environment. The valve cover 10 has a through hole 101. The sleeve 20 passes through the through hole 101 and protrudes from the valve cover 10. Wherein, after the valve cover 10 and the sleeve 20 are welded, a first weld 40 is formed in at least a portion of the first gap 102; a first adhesive 50 fills at least a portion of the first gap 102 through the other end of the first gap 102, and the first adhesive isolates the outside from the first weld 40.

[0018] The protective device for a refrigerant flow valve of this application, in addition to welding, uses a first adhesive to bond the sleeve and valve cover together, enhancing the fixing strength between the sleeve and valve cover; it also protects the first weld 40 between the valve cover 10 and the sleeve 20 from moisture, impurities, etc., preventing corrosion of the first weld 40, and enhancing the weld strength and quality between the valve cover 10 and the sleeve 20. The valve cover 10 and the sleeve 20 can be welded using laser welding or other welding methods. When laser welding is used, the first weld 40 is formed within the gap between the valve cover 10 and the sleeve 20. With other welding methods, the first weld 40 is formed at the connection between the valve cover 10 and the sleeve 20.

[0019] In this embodiment, the valve cover 10 has a first groove 201 at one end away from the chamber 70, which communicates with the other end of the first gap 102. In one example, the first groove 201 can be formed by chamfering the inner wall of the end where the first adhesive 50 is applied in the through hole 101. This chamfer can be machined, and the chamfer setting can control the amount of first adhesive 50 applied, avoiding poor sealing effect due to insufficient first adhesive 50, and preventing impurities and moisture from easily entering the first gap 102 and affecting the quality of the first weld 40. On the other hand, if there is too much first adhesive 50, it will cause waste, and the cured first adhesive 50 will affect the appearance of the product and increase the curing time, thus reducing production efficiency.

[0020] In this embodiment, the protection device for the valve for refrigerant flow also includes a valve seat 30 connected to the valve cover 10. The inner wall of the valve seat 30 and the outer wall of the valve cover 10 have a second gap 302. One end of the second gap 302 communicates with the chamber 70, and the other end communicates with the external environment. After the valve seat 30 and the valve cover 10 are welded, a second weld is formed in at least part of the second gap 302. The second adhesive 60 fills at least part of the second gap through the other end of the second gap 302 and the adhesive isolates the outside from the second weld. The valve seat 30 includes a stepped hole 301, the valve cover 10 is disposed in the stepped hole 301, and the second gap 302 is between the inner wall of the stepped hole 301 and the outer wall of the valve cover 10. One end of the second gap 302 communicates with the chamber 70, and the other end communicates with the external environment. After the valve seat 30 and the valve cover 10 are welded, a second weld is formed in at least part of the second gap 302. The second adhesive 60 fills at least part of the second gap 302 through the other end of the second gap, and the second adhesive 60 isolates the outside from the second weld, further fixing the positional relationship between the valve cover 10, the sleeve 20 and the valve seat 30, further fixing the connection between the sleeve 20, the valve cover 10 and the valve seat 30, and ensuring the assembly firmness of the valve.

[0021] In this embodiment, the valve cover 10 has a second groove 202 at one end opposite to the chamber 70, which communicates with the other end of the second gap 302. In one example, the second groove 202 can be formed by chamfering the inner wall of one end of the stepped hole 301 where the second adhesive 60 is applied. This chamfer can be machined, and the chamfer setting can control the amount of second adhesive 60 applied, avoiding poor sealing effect due to insufficient second adhesive 60, and preventing impurities and moisture from easily entering the second gap 302 and affecting the quality of the second weld. On the other hand, excessive second adhesive 60 will cause waste, affect the appearance of the product after curing, and increase the curing time, thus reducing production efficiency.

[0022] Referring to Figure 4, in this embodiment, the valve cover 10 has a through hole 101, and at least a portion of the sleeve 20 is located within the through hole 101. The inner wall of the through hole 101 and the sleeve 20 form a first gap 102. The through hole 101 includes a first segment 101a and a second segment 101b. The second segment 101b is close to the chamber 70, and the first segment 101a is far from the chamber 70. The valve cover corresponding to the second segment 101b is welded to the sleeve to form the first weld 40. The space between the valve cover corresponding to the first segment 101a and the sleeve is filled with a first adhesive 50. Both the first segment 101a and the second segment 101b are straight segments along the axial direction of the sleeve, with the diameter of the second segment 101b being larger than that of the first segment 101a. The through hole 101 also includes a third segment 101c, which is a tapered segment. Both ends of the third segment 101c are connected to the first segment 101a and the second segment 101b, respectively. The shape of the sleeve matches the shape of the through hole 101, and the tapered segment limits the sleeve, preventing it from detaching from the valve cover under external force. The diameter of the welded end of the through hole 101 is larger than the diameter of the end of the through hole 101 where the first adhesive 50 is applied. This enhances the fixing firmness of the valve cover 10 and the sleeve 20, and prevents impurities, dust, moisture, or corrosive substances from entering the first gap, ensuring the quality of the first weld 40 and extending its service life.

[0023] As shown in Figure 4, the portion of the sleeve 20 located within the through hole 101 includes a first mating section 21 and a second mating section 22 arranged axially along the sleeve 20. Both the first mating section 21 and the second mating section 22 are cylindrical. The first mating section 21 is located away from the chamber 70, and the second mating section 22 is located close to the chamber 70. The second mating section 22 is welded to the valve cover 10 to form a first weld. Specifically, the first mating section 21 corresponds to the first segment 101a of the through hole 101, and the first mating section 21 and the first segment 101a are in a clearance fit. The second mating section 22 corresponds to the second segment 101b of the through hole 101, and the second mating section 22 and the second segment 101b are in an interference fit.

[0024] The sleeve 20 also includes a third mating section 23, which corresponds to the third section 101c of the through hole 101. The third mating section 23 is tapered, and the smaller opening end of the third mating section 23 is connected to the first mating section 21, while the larger opening end of the third mating section 23 is connected to the second mating section 22.

[0025] During the assembly of the sleeve 20 and the valve cover 10, the sleeve 20 is inserted from the larger opening end of the through hole 101 of the valve cover 10 until the first mating section 21, the second mating section 22 and the third mating section 23 correspond to the first section 101a, the second section 101b and the third section 101c of the through hole 101, respectively. Since the first mating section 21 and the first section 101a are in clearance fit, there is a large gap between the outer wall surface of the sleeve 20 and the inner wall of the first section 101a of the through hole 101 during the insertion of the sleeve 20 into the through hole 101, so as to avoid the first section 101a scraping the outer wall surface of the sleeve 20 and causing scratches on the outer wall surface of the sleeve 20. Furthermore, the third mating section 23 is tapered, and the larger opening end of the third mating section 23 is connected to the second mating section 22, so that the second mating section 22 and the third mating section 23 form a flared structure. When the sleeve 20 is installed in place, with the help of the flared structure and the interference fit connection between the second mating section 22 and the second section 101b, the sleeve 20 can be stably inserted into the through hole 101, so that the relative position of the sleeve 20 and the valve cover 10 is fixed, which is beneficial to improving the welding accuracy and welding quality.

[0026] In one embodiment, there is a gap between the third mating section 23 and the wall of the through hole 101. When the sleeve 20 is processed by a stretching process, the dimensional accuracy of the third mating section 23 is difficult to control because it is tapered. However, in this embodiment, the gap between the third mating section 23 and the wall of the third section 101c of the through hole 101 is designed, so the dimensional accuracy of the third mating section 23 does not need to be too precise. Only the dimensional accuracy of the first mating section 21 and the second mating section 22 needs to be ensured. This makes the sleeve 20 easier to process as a whole and improves processing efficiency.

[0027] In this embodiment, the outer periphery of the valve cover 10 has an annular groove, and an O-ring is provided in the annular groove. The sidewall of the annular groove contacts the bottom wall of the stepped hole 301 of the valve seat 30 to achieve the positioning of the valve seat 30.

[0028] The valve in this application can be a solenoid valve, an electronic expansion valve, a switching valve, etc. In the structure of other valves, an annular groove is provided at the upper end of the valve cover 10 near the sleeve 20. This annular groove is mainly used to install an O-ring seal to protect the first weld 40. Referring to Figure 4, in the valve 1 of this application, since a protective device for the valve for refrigerant flow is provided, the sealing ring is not required here. The provision of a protective device for the valve for refrigerant flow can save on sealing rings, reduce costs, and also simplify the assembly process.

[0029] In this embodiment, the first adhesive 50 and / or the second adhesive 60 include visible light curable structural adhesive or ultraviolet light curable adhesive. Visible light curable structural adhesives are cured primarily by visible light irradiation, requiring no additional curing light devices, resulting in excellent curing performance without affecting product appearance. The curing method is simple and environmentally friendly, reducing production costs and improving production efficiency. Ultraviolet light curable adhesives are cured by ultraviolet light irradiation, resulting in short curing time, excellent curing performance, and no impact on product appearance. The curing method is simple and environmentally friendly, reducing production costs and improving production efficiency. The adhesives of this application can be used for potting and sealing, and can bond glass and metal, or two metals together.

[0030] In this embodiment, the viscosity of the first adhesive 50 and / or the second adhesive 60 is 200 cps-300 cps, and can be 210 cps, 220 cps, 230 cps, 240 cps, 250 cps, 255 cps, 260 cps, 270 cps, 280 cps, 290 cps, etc. The full curing time of the first adhesive 50 and / or the second adhesive 60 is 2 seconds-60 seconds, and can be 10 seconds, 20 seconds, 30 seconds, 35 seconds, 45 seconds, 50 seconds, etc. The curing time of the first adhesive 50 and / or the second adhesive 60 can be several seconds. Commonly used anaerobic thread fastener locking sealants, instant adhesives, anaerobic planar sealants, pipe thread sealants, and component adhesives in this field all cure at room temperature. Except for instant adhesives, the curing time of the other adhesives reaches 24 hours, which is a long curing time and seriously affects production efficiency. Besides instant adhesives, the curing times of other adhesives range from a few minutes to several hours. Longer curing times can cause misalignment between the valve seat 30, valve cover 10, and sleeve 20 before they are properly fixed, leading to dimensional inconsistencies in subsequent assembly and reducing product yield. Furthermore, commonly used anaerobic thread fastener locking sealants, instant adhesives, anaerobic planar sealants, pipe thread sealants, and component adhesives all cure at room temperature. Except for instant adhesives, the viscosities of these other adhesives are all above 1000 cps, even reaching 15000 cps. Such high viscosity makes application difficult and the amount used hard to control, easily leading to adhesive overflow.

[0031] Although instant adhesives have a relatively short curing time and low viscosity, they are only suitable for bonding plastics and rubbers, and cannot be used for bonding metals or glass and metals.

[0032] In this embodiment, the first adhesive 50 and / or the second adhesive 60 are corrosion-resistant and are colorless or pale yellow transparent liquids. The corrosion-resistant adhesives provide good and long-lasting protection for the first weld 40. The colorless or pale yellow transparent liquids have good fluidity, are easy to apply, and after curing, no adhesive layer is visible, having almost no impact on the product's appearance; the product's appearance remains essentially unchanged. Commonly used anaerobic thread fastener locking sealants, instant adhesives, anaerobic planar sealants, pipe thread sealants, and component adhesives in this field all cure at room temperature. Except for instant adhesives, the other adhesives have a wide range of colors, mostly white, blue, red, green, or grayish-green, which severely affects the product's appearance. Although instant adhesives are transparent and colorless, they are only used for bonding plastics and rubbers, not for bonding metals or glass and metal.

[0033] In this embodiment, the valve also includes a first core iron and a second core iron. The first core iron is fixedly connected to the sleeve 20, and the second core iron moves within the sleeve 20. The valve seat 30 and the valve cover 10 form a chamber 70. A piston is provided in the chamber 70, and the valve seat 30 is provided with a valve port. The second core iron moves within the sleeve 20 to realize the piston closing or opening the valve port.

[0034] The refrigerant flow valve protection device of this application also has a second embodiment, which has a substantially the same basic structure as the refrigerant flow valve protection device of the embodiments shown in Figures 1 to 5. Therefore, in the following description of the refrigerant flow valve protection device of this second embodiment, the structures already described in the embodiments of Figures 1 to 5 will not be repeated. In addition, structures with the same structure as the refrigerant flow valve protection device 1 described in the embodiments of Figures 1 to 5 will be marked with the same reference numerals. Therefore, in the following description of this embodiment, the differences from the refrigerant flow valve protection device 1 of the embodiments of Figures 1 to 5 will be mainly described. In this second embodiment, the refrigerant flow valve protection device is characterized by a chamfered groove on the inner wall of the through hole 101 of the valve cover 10 at the end where the first adhesive 50 is disposed, and a chamfered edge on the inner wall of the stepped hole 301 of the valve seat 30 at the end where the first adhesive 50 is disposed.

[0035] The refrigerant flow valve protection device of this application also has a third embodiment, which has a substantially the same basic structure as the refrigerant flow valve protection devices of the embodiments shown in Figures 1 to 5. Therefore, in the following description of the refrigerant flow valve protection device of this third embodiment, the structures already described in the embodiments of Figures 1 to 5 will not be repeated. In addition, structures with the same structure as the refrigerant flow valve protection device 1 described in the embodiments of Figures 1 to 5 will be labeled with the same reference numerals. Therefore, in the following description of this embodiment, the differences from the refrigerant flow valve protection device 1 of the embodiments of Figures 1 to 5 will be mainly described. In this third embodiment, the refrigerant flow valve protection device is characterized by a chamfered inner wall at the end of the through hole 101 of the valve cover 10 where the first adhesive 50 is disposed, and a grooved inner wall at the end of the stepped hole 301 of the valve seat 30 where the first adhesive 50 is disposed.

[0036] The refrigerant flow valve protection device of this application also has a fourth embodiment, which has a substantially the same basic structure as the refrigerant flow valve protection devices of the embodiments shown in Figures 1 to 5. Therefore, in the following description of the refrigerant flow valve protection device of this fourth embodiment, the structures already described in the embodiments of Figures 1 to 5 will not be repeated. In addition, structures with the same structure as the refrigerant flow valve protection device 1 described in the embodiments of Figures 1 to 5 will be marked with the same reference numerals. Therefore, in the following description of this embodiment, the differences from the refrigerant flow valve protection device 1 of the embodiments of Figures 1 to 5 will be mainly described. In this fourth embodiment, the refrigerant flow valve protection device is characterized by a groove on the inner wall of the valve cover 10, where the through hole 101 is provided with the first adhesive 50, and a groove on the inner wall of the stepped hole 301 of the valve seat 30, where the first adhesive 50 is provided.

[0037] The above is a detailed description of several exemplary embodiments of the protection device for a valve for refrigerant flow proposed in this application. The implementation process of the protection device for a valve for refrigerant flow proposed in this application will be described in detail below.

[0038] When assembling valve 1, first, the end of sleeve 20 with the larger diameter of the through hole 101 of valve cover 10 is passed through and extends out of valve cover 10. The lower end of sleeve 20 is flush with the lower end of valve cover 10, and a first gap 102 exists between sleeve 20 and valve cover 10. The lower end of sleeve 20 and the lower end of valve cover 10 are welded together at the first gap 102. Then, sleeve 20 and valve cover 10 are installed as a whole into the stepped hole 301 of valve seat 30, forming a second gap 302 between valve cover 10 and valve seat 30.

[0039] Apply adhesive to the first gap 102 and the second gap 302.

[0040] It is understood that the various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions, and will not be described in detail here.

[0041] In the exemplary embodiments described above, the protection device for a refrigerant flow valve proposed in this disclosure is illustrated using an application to a valve as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments to apply the relevant designs of this disclosure to other types of devices, and these changes remain within the scope of the principles of the protection device for a refrigerant flow valve proposed in this disclosure.

[0042] It should be noted that the protective devices for valves used for refrigerant flow shown in the accompanying drawings and described in this specification are merely a few examples among many protective devices for valves used for refrigerant flow that can employ the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the protective devices for valves used for refrigerant flow shown in the accompanying drawings or described in this specification.

[0043] In the embodiments of this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0044] In the description of the embodiments of this disclosure, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0045] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. When describing elements / components / etc. described and / or illustrated herein, the terms "a," "an," and "the above" are used to indicate the presence of one or more elements / components / etc. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The above are merely preferred embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to these embodiments by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A protection device for a valve used for refrigerant flow, wherein, include: Valve cover; A sleeve, wherein a first gap exists between the valve cover and the sleeve; A chamber isolated from the outside world, wherein the valve cover and the sleeve form part of the wall surface of the chamber; After the valve cover is welded to the sleeve, a first weld is formed in at least part of the first gap; the first gap between the valve cover and the sleeve is also filled with a first adhesive.

2. The protection device for a valve for refrigerant flow as described in claim 1, wherein, One end of the first gap faces the cavity, and the first weld is located at one end of the first gap; the other end of the first gap faces the external environment. The first adhesive fills at least part of the first gap through the other end of the first gap, and the first adhesive isolates the outside from the first weld.

3. The protection device for a valve for refrigerant flow as described in claim 1, wherein, The valve cover has a first groove at one end opposite to the chamber, which communicates with the other end of the first gap.

4. The protection device for a valve for refrigerant flow as described in claim 1, wherein, It also includes a valve seat connected to the valve cover; there is a second gap between the inner wall of the valve seat and the outer wall of the valve cover; after the valve seat and the valve cover are welded, a second weld is formed in at least part of the second gap, and a second adhesive fills at least part of the second gap through the other end of the second gap, and the second adhesive isolates the outside from the second weld.

5. The protection device for a valve for refrigerant flow as described in claim 4, wherein, The valve cover has a second groove at one end opposite to the chamber, which communicates with the other end of the second gap.

6. The protection device for a valve for refrigerant flow as described in claim 4, wherein, The valve seat includes a stepped hole, and the valve cover is disposed in the stepped hole. A second gap is formed between the inner wall of the stepped hole and the outer wall of the valve cover. One end of the second gap communicates with the chamber, and the other end communicates with the external environment.

7. The protection device for a valve for refrigerant flow as described in any one of claims 4-6, wherein, The second adhesive includes a visible light curable structural adhesive, which cures after being exposed to visible light; or an ultraviolet light curable adhesive, which cures after being exposed to ultraviolet light.

8. The protection device for a valve for refrigerant flow as described in any one of claims 4-6, wherein, The curing time of the second adhesive is 2 to 60 seconds.

9. The protection device for a valve for refrigerant flow as described in any one of claims 1-6, wherein, The first adhesive includes a visible light curable structural adhesive, which cures after being exposed to visible light; or an ultraviolet light curable adhesive, which cures after being exposed to ultraviolet light.

10. The protection device for a valve for refrigerant flow as described in any one of claims 1-6, wherein, The curing time of the first adhesive is 2 to 60 seconds.

11. The protection device for a valve for refrigerant flow as claimed in claim 1, wherein, The valve cover has a through hole, at least a portion of the sleeve is located within the through hole, and the inner wall of the through hole and the sleeve form the first gap.

12. The protection device for a valve for refrigerant flow as described in claim 11, wherein, The through hole includes a first section and a second section. The second section is located at one end of the through hole closer to the chamber, and the first section is located at one end of the through hole farther from the chamber. The valve cover corresponding to the second section is welded to the sleeve to form the first weld. The first adhesive is filled between the valve cover corresponding to the first section and the sleeve.

13. The protection device for a valve for refrigerant flow as described in claim 12, wherein, Both the first segment and the second segment are straight segments along the axial direction of the sleeve, and the diameter of the second segment is larger than the diameter of the first segment; the through hole also includes a third segment, which is a tapered segment, and the two ends of the third segment are respectively connected to the first segment and the second segment; the shape of the sleeve is adapted to the shape of the through hole.

14. The protection device for a valve for refrigerant flow as described in claim 13, wherein, It also includes a first core iron, a second core iron, and a valve seat connected to the valve cover. The first core iron is fixedly connected to the sleeve, and the second core iron moves within the sleeve. The valve seat and the valve cover form the chamber, and a piston is provided in the chamber. The valve seat has a valve port, and the second core iron moves within the sleeve to realize the piston closing or opening the valve port.

15. The protection device for a valve for refrigerant flow as described in claim 11, wherein, The portion of the sleeve located within the through hole includes a first mating section and a second mating section arranged axially along the sleeve. The first mating section is away from the chamber, and the second mating section is close to the chamber. The second mating section is welded to the valve cover to form the first weld. The first mating section has a clearance fit with the through hole, and the second mating section has an interference fit with the through hole.

16. The protection device for a valve for refrigerant flow as described in claim 15, wherein, The sleeve further includes a third mating section, which is tapered, with its smaller opening end connected to the first mating section and its larger opening end connected to the second mating section.

17. The protection device for a valve for refrigerant flow as claimed in claim 16, wherein there is a gap between the third mating section and the wall of the through hole.

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