Protective device for valve for coolant flow

Abstract

The utility model provides a protection device for a valve for refrigerant circulation. The protection device for the valve for refrigerant circulation comprises a valve cover, a sleeve and a cavity isolated from the outside. A first gap is formed between the valve deck and the sleeve, one end of the first gap communicates with the cavity, and the other end of the first gap communicates with the external environment. After the valve cover and the sleeve are welded, a first welding seam is formed in at least part of the first gap; the glue fills at least part of the first gap through the other end of the first gap and separates the outside from the first welding seam.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a protection device for a valve for refrigerant flow. BACKGROUND

[0002] Such as solenoid valve, electronic expansion valve, etc., all include valve cover, valve seat and sleeve, installation, sleeve and valve cover along the axial welding connection, sleeve and valve cover welding connection. But the welding position exists welding not firm, make sleeve and valve cover between the fixed strength is not enough. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a kind of protection device for valve for refrigerant flow which can enhance the fixed strength between sleeve and valve cover.

[0004] To achieve the above object, the present application adopts the following technical solutions:

[0005] According to one aspect of the present application, a kind of protection device for valve for refrigerant flow, including valve cover, sleeve and with outside isolation chamber.There is first gap between valve cover and sleeve;Valve cover and sleeve are part of wall surface of chamber, first weld is formed in at least part of first gap after valve cover and sleeve welding;Glue is also filled in the first gap between valve cover and sleeve.

[0006] According to one of the embodiments of the present application, one end of first gap is towards chamber, and first weld is located in one end of first gap;The other end of first gap is towards outside environment;Glue fills at least part of first gap through the other end of first gap, and glue separates outside from first weld.

[0007] According to one of the embodiments of the present application, the end of the valve cover away from the chamber has a groove in communication with the other end of the first gap.

[0008] According to one of the embodiments of the present application, further comprising valve seat connected with valve cover;There is second gap between the inner wall of valve seat and the outer wall of valve cover;Second weld is formed in at least part of second gap after valve seat and valve cover welding, and glue fills at least part of second gap through the other end of second gap, and glue separates outside from second weld.

[0009] According to one of the embodiments of the present application, the end of the valve cover away from the chamber has a groove in communication with the other end of the second gap.

[0010] According to one of the embodiments of the present application, the valve seat comprises a stepped hole, the valve cover is arranged in the stepped hole, and the 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 being communicated with the chamber and the other end being communicated with the external environment; the second weld is formed in at least part of the second gap after the valve seat and the valve cover are welded, and the glue fills at least part of the second gap through the other end of the second gap and separates the external environment from the second weld.

[0011] According to one of the embodiments of the present application, the glue comprises visible light curing structural glue, which is cured after visible light irradiation; or ultraviolet light curing glue, which is cured after ultraviolet light irradiation.

[0012] According to one of the embodiments of the present application, the curing time of the glue is 2-60 seconds.

[0013] According to one of the embodiments of the present application, the valve cover has a through hole, and at least part of the sleeve is arranged in the through hole, the first gap being formed between the inner wall of the through hole and the sleeve.

[0014] According to one of the embodiments of the present application, the through hole comprises a first section and a second section, the second section being arranged at one end of the through hole close to the chamber, and the first section being arranged at the other end of the through hole away from the chamber, the second section corresponding to the valve cover and the sleeve being welded to form the first weld; the first section corresponding to the valve cover and the sleeve being filled with glue.

[0015] According to one of the embodiments of the present application, the first section and the second section are linear sections along the axial direction of the sleeve, and the diameter of the second section is greater than that of the first section; the through hole further comprises a third section, the third section being a tapered section, and the two ends of the third section being connected with the first section and the second section respectively; the sleeve is shaped to be matched with the shape of the through hole.

[0016] According to one of the embodiments of the present application, the protection device comprises a first core iron and a second core iron, the first core iron being fixedly connected with the sleeve, and the second core iron being movably arranged in the sleeve; the valve seat and the valve cover enclose the chamber, the chamber is provided with a piston, the valve seat is provided with a valve port, and the second core iron is movably arranged in the sleeve to realize the closing or opening of the valve port.

[0017] From the above technical solution, the protection device for the valve for refrigerant flow proposed by the present application has the following advantages and positive effects:

[0018] The protection device for the valve for refrigerant flow proposed by the present application has the following advantages and positive effects:

[0019] 1. In addition to welding, the sleeve and the valve cover are also bonded by glue to enhance the fixing strength between the sleeve and the valve cover.

[0020] 2、In addition, the welding connection between the valve cover and the sleeve forms a first weld, one end of the first weld is not connected with the external environment, avoiding the contact of external impurities with the end of the weld, reducing the corrosion of the weld. The other end of the first weld is separated from the external environment by glue, which can avoid the entry of impurities, water vapor and the like into the first weld during use, affecting the quality of the weld. The protection device for the valve for refrigerant flow of the present application can protect the first weld, ensure the quality of the first weld, and prolong the service life of the first weld. BRIEF DESCRIPTION OF DRAWINGS

[0021] The various objects, features and advantages of the present application will become more apparent from the following detailed description of preferred embodiments of the application, when considered in conjunction with the accompanying drawings. The drawings are not necessarily to scale, and in some instances, various components of the application can be shown exaggerated in scale or in somewhat schematic form, and again, details of the application can be shown in block diagram form. In the drawings:

[0022] Figure 1 is a schematic view of the protection device for the valve for refrigerant flow and the valve of the present application.

[0023] Figure 2 is a top view of Figure 1

[0024] Figure 3 is an A-A sectional view of Figure 2

[0025] Figure 4 is an enlarged schematic view of I of Figure 3

[0026] Figure 5 is a schematic view of the structure of Figure 1 along A-A in Figure 2

[0027] The reference signs are explained as follows:

[0028] 1 - valve

[0029] 10 - valve cover

[0030] 20 - sleeve

[0031] 30 - valve seat

[0032] 40 - first weld

[0033] 50 - glue

[0034] 101 - through hole

[0035] 102 - first gap

[0036] 301 - stepped hole ​​​​

[0037] 302 - second slit. DETAILED DESCRIPTION

[0038] Example implementations are now described with reference to the drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects of the example implementations to those skilled in the art. Like reference numerals refer to like elements throughout the specification. Detailed descriptions of structures, systems, and steps are omitted so as not to obscure the example implementations described in this disclosure.

[0039] In the following description of various example embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various example structures, systems, and steps in which aspects of the present disclosure can be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps can be utilized and that structural and functional modifications can be made without departing from the scope of the present disclosure. Also, while the terms "over," "between," "inside" or the like can be used in the present description and claims to describe one aspect of the present disclosure relative to another, these terms are used herein to describe relative positioning only and are not intended to limit the scope of the present disclosure to only those structures described herein.

[0040] It is to be understood that the terms "including", "comprising", "consisting" and "having" and variations thereof herein are intended to be broad and encompass the terms "consisting essentially of" and "consisting of".

[0041] Relative terms such as "lower" or "bottom" and "upper" or "top" can be used herein to describe one element's or feature's relationship to another element or feature as illustrated in the figures. These relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in one of the figures is turned over, elements described as being on the "lower" side of other elements would then be oriented on "upper" sides of the other elements. The exemplary term "lower" can therefore encompass both an orientation of "lower" and "upper," depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as "below" or "beneath" other elements would then be oriented "above" the other elements. The exemplary term "below" or "beneath" can therefore encompass both an orientation of "below" and "above." The exemplary term "above" can encompass both an orientation of "above" and "below." The exemplary term "top" can encompass both an orientation of "top" and "bottom." The exemplary term "bottom" can encompass both an orientation of "bottom" and "top." The exemplary term "front" can encompass both an orientation of "front" and "back." The exemplary term "back" can encompass both an orientation of "back" and "front."

[0042] Referring to Figures 1 to 5 The application provides a valve 1, wherein the valve 1 comprises a protection device for a valve for refrigerant circulation, the protection device for the valve for refrigerant circulation comprising a valve cover 10, a sleeve 20 and a chamber isolated from the outside. The valve cover 10 and the sleeve 20 have a first gap 102 therebetween, one end of the first gap 102 being in communication with the chamber and the other end being in communication with the outside environment. The valve cover 10 has a through hole 101. The sleeve 20 passes through the through hole 101 and protrudes out of the valve cover 10. The valve cover 10 and the sleeve 20 are welded to form a first weld 40 in at least part of the first gap 102, and glue 50 fills at least part of the first gap 102 through the other end of the first gap 102 and separates the outside from the first weld 40.

[0043] The protection device for the valve for refrigerant circulation of the application uses glue to bond the sleeve and the valve cover in addition to welding, thereby enhancing the fixing strength between the sleeve and the valve cover. The protection device for the valve for refrigerant circulation of the application can also protect the first weld 40 between the valve cover 10 and the sleeve 20 from water vapor, impurities and the like, thereby avoiding corrosion of the first weld 40 and enhancing the welding firmness and quality between the valve cover 10 and the sleeve 20. The welding mode of the valve cover 10 and the sleeve 20 can be laser welding or other welding modes. When laser welding is used, the first weld 40 is generated in the gap between the valve cover 10 and the sleeve 20. When other welding modes are used, the first weld 40 is generated at the connection between the valve cover 10 and the sleeve 20.

[0044] In the embodiment, the end of the valve cover 10 away from the chamber has a groove in communication with the other end of the first gap 102, for example, the inner wall of the end of the through hole 101 where the glue 50 is arranged has a chamfer. The chamfer can be formed by machining, and the chamfer can control the amount of glue 50 applied, thereby avoiding poor sealing effect due to too little glue 50, and impurities and water vapor easily entering the first gap 102 to affect the quality of the first weld 40. When there is too much glue 50, on the one hand, waste is caused, and on the other hand, the appearance of the product is affected after the glue 50 solidifies, and the solidification time is increased, thereby reducing the production efficiency.

[0045] In the embodiment, the protection device for the valve for refrigerant flow further comprises a valve seat 30 connected with 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 is communicated with the chamber, and the other end is communicated with the external environment; after the valve seat 30 is welded with the valve cover 10, a second weld is formed in at least part of the second gap 302, the glue 50 fills at least part of the second gap 302 through the other end of the second gap 302, and the glue 50 separates the external environment from the second weld. The valve seat 30 comprises a stepped hole 301, the valve cover 10 is arranged in the stepped hole 301, 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 is communicated with the chamber, and the other end is communicated with the external environment; after the valve seat 30 is welded with the valve cover 10, a second weld is formed in at least part of the second gap 302, the glue 50 fills at least part of the second gap 302 through the other end of the second gap, and the glue 50 separates the external environment from the second weld 302, further fixes the positional relationship between the valve cover 10 and the sleeve 20 and the valve seat 30, further fixes the connection between the sleeve 20, the valve cover 10 and the valve seat 30, and ensures the assembly firmness of the valve.

[0046] In the embodiment, the end of the valve cover 10 away from the chamber has a groove communicated with the other end of the second gap 302, for example, the inner wall of the end of the stepped hole 301 arranged with the glue 50 has a chamfer. The chamfer can be formed by machining, and the setting of the chamfer can control the amount of glue 50, avoid the poor sealing effect due to too little glue 50, and avoid the impurities and water vapor easily entering the second gap 302 to affect the quality of the second weld. When the glue 50 is too much, on the one hand, it will cause waste, and on the other hand, it will affect the appearance of the product after the glue 50 solidifies, and the solidification time will be increased, which reduces the production efficiency.

[0047] Referring to Figure 1 , Figure 3 and Figure 5In the embodiment, the valve cover 10 has a through hole 101, at least part of the sleeve 20 is located in the through hole 101, and a first gap 102 is formed between the inner wall of the through hole 101 and the sleeve 20. The through hole 101 includes a first section and a second section, the second section is close to the chamber, and the first section is away from the chamber. The second section corresponds to the welding of the valve cover and the sleeve to form the first welding seam 40. The first section corresponds to the filling of the glue 50 between the valve cover and the sleeve. The first section and the second section are straight sections along the axial direction of the sleeve, and the diameter of the second section is greater than that of the first section. The through hole 101 further includes a third section, which is a tapered section, and the two ends of the third section are connected with the first section and the second section respectively. The sleeve is shaped to match the shape of the through hole 101, and the tapered section limits the sleeve to prevent the sleeve from being separated from the valve cover under external force. The diameter of the welding end of the through hole 101 is greater than that of the end of the through hole 101 where the glue 50 is arranged. The fixing firmness of the valve cover 10 and the sleeve 20 is enhanced, and impurities, dust, water vapor or corrosive substances are prevented from entering the first gap, thereby ensuring the quality of the first welding seam 40 and prolonging the service life of the first welding seam 40.

[0048] In the embodiment, the outer periphery of the valve cover 10 has an annular groove, and an O-shaped sealing ring is arranged in the annular groove. The side wall of the annular groove is in contact with the bottom wall of the stepped hole 301 of the valve seat 30, thereby positioning the valve seat 30.

[0049] The valve of the present application can be a solenoid valve, an electronic expansion valve, a switching valve, or the like. In the structure of other valves, an annular groove is further arranged at the position where the upper end of the valve cover 10 is close to the sleeve 20. The annular groove is mainly used for arranging an O-shaped sealing ring to protect the first welding seam 40. See Figure 4 In the valve 1 of the present application, the sealing ring is not required to be arranged due to the arrangement of the protection device for the valve for refrigerant circulation. The arrangement of the protection device for the valve for refrigerant circulation can save the sealing ring, reduce the cost, and simplify the assembly process.

[0050] In the embodiment, the glue 50 includes visible light curing structural glue or ultraviolet light curing glue. The curing method of the visible light curing structural glue mainly uses visible light irradiation, does not require other additional fixing light devices, has good curing effect, does not affect the appearance of the product, is simple and environmentally friendly in curing method, can reduce production cost, and improves production efficiency. The ultraviolet light curing glue uses ultraviolet light irradiation for curing, has short fixing time, good fixing effect, and does not affect the appearance of the product. The curing method is simple and environmentally friendly, can reduce production cost, and improves production efficiency. The glue 50 of the present application can be used for potting sealing and can bond glass and metal or two metals.

[0051] In the embodiment, the viscosity of the glue 50 is 200cps-300cps, which can be 210cps, 220cps, 230cps, 240cps, 250cps, 255cps, 260cps, 270cps, 280cps, 290cps, etc. The full curing time of the glue 50 is 2 seconds-60 seconds, which can be 10 seconds, 20 seconds, 30 seconds, 35 seconds, 45 seconds, 50 seconds, etc. The setting time of the glue 50 can be several seconds. The curing mode of the anaerobic thread fastener locking sealant, instant adhesive series, anaerobic flat sealant, pipeline thread sealant, and part Loctite commonly used in the field is room temperature curing. Except for instant adhesive, the curing time of the rest of the glue reaches 24 hours, the curing time is long, and seriously affects the production efficiency. Except for instant adhesive, the setting time of the rest of the glue is from several minutes to several hours. The setting time is relatively long, which is easy to cause the relative position between the valve seat 30, the valve cover 10, and the sleeve 20 to deviate before being fixed, resulting in problems in subsequent assembly size and reducing the qualified rate of products. In addition, the curing mode of the anaerobic thread fastener locking sealant, instant adhesive series, anaerobic flat sealant, pipeline thread sealant, and part Loctite commonly used in the field is room temperature curing. Except for instant adhesive, the viscosity of the rest of the glue reaches 1000cps or more, even up to 15000cps, the viscosity is too high, which makes the glue 50 not easy to operate when being applied, and the amount is not easy to grasp, which is easy to cause overflow and other conditions.

[0052] Although the curing time of instant adhesive is relatively short, and the viscosity is relatively low, however, instant adhesive is only used for bonding between plastic and rubber, and cannot be used for bonding between metals, nor can it be used for bonding between glass and metal.

[0053] In the embodiment, the glue 50 is corrosion-resistant and is a colorless or light yellow transparent liquid. The corrosion-resistant glue 50 can play a good and long-lasting protective role for the first weld 40. The colorless or light yellow transparent liquid has good flowability, the glue dispensing operation is simple, and the appearance of the product is almost not affected after the glue 50 is cured, and the appearance of the product is basically unchanged. The curing mode of the anaerobic thread fastener locking sealant, instant adhesive series, anaerobic flat sealant, pipeline thread sealant, and part Loctite commonly used in the field is room temperature curing. Except for instant adhesive, the rest of the glue has rich colors, which are mostly white, blue, red, green, or gray-green colored glue, which seriously affects the appearance of the product. Although instant adhesive is transparent and colorless, it is only used for bonding between plastic and rubber, and cannot be used for bonding between metals, nor can it be used for bonding between glass and metal.

[0054] In the present embodiment, the valve further comprises a first core iron and a second core iron, the first core iron is fixedly connected with the sleeve 20, and the second core iron is movable in the sleeve 20; the valve seat 30 and the valve cover 10 enclose a cavity, a piston is arranged in the cavity, the valve seat 30 is provided with a valve port, and the second core iron is movable in the sleeve 20 to realize closing or opening of the valve port.

[0055] The protection device for the valve for refrigerant circulation of the present application also has a second embodiment. The protection device for the valve for refrigerant circulation of the second embodiment has substantially the same structure as the protection device for the valve for refrigerant circulation of the embodiment of Figures 1 to 5 Therefore, in the following description of the protection device for the valve for refrigerant circulation of the second embodiment, the structures that have been described in the embodiment of Figures 1 to 5 will not be repeated. In addition, the same reference numerals are marked to the structures that are the same as the structures of the protection device for the valve for refrigerant circulation 1 described in the embodiment of Figures 1 to 5 Therefore, in the following description of the protection device for the valve for refrigerant circulation of the second embodiment, the structures that have been described in the embodiment of Figures 1 to 5 will not be repeated. In addition, the same reference numerals are marked to the structures that are the same as the structures of the protection device for the valve for refrigerant circulation 1 described in the embodiment of

[0056] The protection device for the valve for refrigerant circulation of the present application also has a third embodiment. The protection device for the valve for refrigerant circulation of the third embodiment has substantially the same structure as the protection device for the valve for refrigerant circulation of the embodiment of Figures 1 to 5 Therefore, in the following description of the protection device for the valve for refrigerant circulation of the third embodiment, the structures that have been described in the embodiment of Figures 1 to 5 will not be repeated. In addition, the same reference numerals are marked to the structures that are the same as the structures of the protection device for the valve for refrigerant circulation 1 described in the embodiment of Figures 1 to 5 Therefore, in the following description of the protection device for the valve for refrigerant circulation of the third embodiment, the structures that have been described in the embodiment of Figures 1 to 5 will not be repeated. In addition, the same reference numerals are marked to the structures that are the same as the structures of the protection device for the valve for refrigerant circulation 1 described in the embodiment of

[0057] The protection device for the valve for refrigerant flow of the present application also has a fourth embodiment, which has substantially the same structure in the basic configuration as the protection device for the valve for refrigerant flow of the first, second and third embodiments. Figures 1 to 5 The protection device for the valve for refrigerant flow of the fourth embodiment has substantially the same structure in the basic configuration as the protection device for the valve for refrigerant flow of the first, second and third embodiments. Therefore, in the following description of the protection device for the valve for refrigerant flow of the fourth embodiment, the structures already described in the first, second and third embodiments will not be repeated. Figures 1 to 5 The protection device for the valve for refrigerant flow of the fourth embodiment has substantially the same structure in the basic configuration as the protection device for the valve for refrigerant flow of the first, second and third embodiments. Therefore, in the following description of the protection device for the valve for refrigerant flow of the fourth embodiment, the structures already described in the first, second and third embodiments will not be repeated. Figures 1 to 5 The protection device for the valve for refrigerant flow of the fourth embodiment has substantially the same structure in the basic configuration as the protection device for the valve for refrigerant flow of the first, second and third embodiments. Therefore, in the following description of the protection device for the valve for refrigerant flow of the fourth embodiment, the structures already described in the first, second and third embodiments will not be repeated. Figures 1 to 5 Figures 1 to 5 The protection device for the valve for refrigerant flow of the fourth embodiment has substantially the same structure in the basic configuration as the protection device for the valve for refrigerant flow of the first, second and third embodiments. Therefore, in the following description of the protection device for the valve for refrigerant flow of the fourth embodiment, the structures already described in the first, second and third embodiments will not be repeated.

[0058] The above is the detailed description of the several exemplary embodiments of the protection device for the valve for refrigerant flow of the present application, and the implementation process of the protection device for the valve for refrigerant flow of the present application will be described in detail as follows.

[0059] In the assembly of the valve 1, first, the sleeve 20 is inserted into the valve cover 10 through the through hole 101 of the valve cover 10 with the larger diameter end of the through hole 101 of the valve cover 10, the lower end of the sleeve 20 is flush with the lower end of the valve cover 10, and the first gap 102 exists between the sleeve 20 and the valve cover 10. Then, the sleeve 20 and the valve cover 10 are integrally installed into the stepped hole 301 of the valve seat 30, and the second gap 302 is formed between the valve cover 10 and the valve seat 30.

[0060] The dispensing operation is performed on the first gap 102, and the dispensing operation is performed on the second gap 302.

[0061] It can be understood that the various embodiments / embodiments of the present application can be combined with each other without contradiction, and will not be illustrated one by one here.

[0062] In the above exemplary embodiments, the protection device for the valve for refrigerant flow of the present application is described by taking the application in the valve as an example. It is easy for those skilled in the art to understand that various modifications, additions, substitutions, deletions or other changes can be made to the specific embodiments in order to apply the related designs of the present application to other types of devices, and these changes are still within the scope of the principle of the protection device for the valve for refrigerant flow of the present application.

[0063] It should be noted that the protection device for the valve for refrigerant circulation shown in the drawings and described in the specification is only a few examples of the many protection devices for the valve for refrigerant circulation that can employ the principles of the present application. It should be clearly understood that the principles of the present application are in no way limited to any detail or any component of the protection device for the valve for refrigerant circulation shown in the drawings or described in the specification.

[0064] In the embodiments of the present application, the terms "first", "second", "third" are only for descriptive purposes and should not be construed or implied as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connection", "fixing" and the like should be interpreted broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; "connection" can be direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0065] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be construed or implied as indicating or implying that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the embodiments of the present application.

[0066] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. When introducing the elements / components / etc. described and / or illustrated herein, the words "one", "an" and "the" are used to mean that there is one or more elements / components / etc. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0067] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A protection device for a valve for the circulation of a refrigerant, characterized in that, The application relates to a valve cover, a sleeve, a chamber isolated from the outside world, a first weld seam formed in at least part of a first gap between the valve cover and the sleeve after welding, and glue filled in the first gap. One end of the first gap is directed towards the chamber, and the first weld seam is located at the one end of the first gap; the other end of the first gap is directed towards the outside environment; the glue fills at least part of the first gap through the other end of the first gap, and the glue separates the outside world from the first weld seam. The end of the valve cover away from the chamber has a groove in communication with the other end of the first gap. The application further relates to a valve seat connected to the valve cover, a second gap between the inner wall of the valve seat and the outer wall of the valve cover, a second weld seam formed in at least part of a second gap between the valve seat and the valve cover after welding, and glue filled in at least part of the second gap through the other end of the second gap, and the glue separates the outside world from the second weld seam. The end of the valve cover away from the chamber has a groove in communication with the other end of the second gap.

2. The protection device for a valve for refrigerant flow passage according to claim 1, characterized in that, The valve seat comprises a stepped hole, the valve cover is arranged in the stepped hole, the inner wall of the stepped hole and the outer wall of the valve cover form the second gap, one end of the second gap is in communication with the chamber, and the other end of the second gap is in communication with the outside environment; the valve seat and the valve cover are welded to form the second weld seam in at least part of the second gap, the glue fills at least part of the second gap through the other end of the second gap, and the glue separates the outside world from the second weld seam.

3. The protection device for a valve for refrigerant flow passage according to claim 1, characterized in that, The glue comprises visible light curing structural glue, which is cured after visible light irradiation; or ultraviolet light curing glue, which is cured after ultraviolet light irradiation.

4. The protection device for a valve for refrigerant flow passage according to claim 1, characterized in that, The curing time of the glue is 2-60 seconds.

5. The protection device for a valve for refrigerant flow passage according to claim 4, characterized in that, The valve cover has a through hole, at least part of the sleeve is located in the through hole, and the inner wall of the through hole and the sleeve form the first gap.

6. The protection device for a valve for refrigerant flow passage according to claim 4, characterized in that, The through hole comprises a first section and a second section, the second section is located at one end of the through hole close to the chamber, the first section is located at one end of the through hole away from the chamber, the second section corresponds to the valve cover and the sleeve welded to form the first weld seam; the first section corresponds to the valve cover and the sleeve filled with glue.

7. The protection device for a valve for circulation of a refrigerant according to any one of claims 1 to 6, characterized in that, Both the first section and the second section are linear sections along the axial direction of the sleeve, the diameter of the second section is larger than that of the first section; the through hole further comprises a third section, the third section is a tapered section, and the two ends of the third section are connected with the first section and the second section respectively; the sleeve is shaped to be matched with the shape of the through hole.

8. The protection device for a valve for circulation of a refrigerant according to any one of claims 1 to 6, characterized in that, The application further relates to a first core iron and a second core iron, the first core iron is fixedly connected with the sleeve, the second core iron moves in the sleeve; the valve seat and the valve cover enclose the chamber, a piston is arranged in the chamber, the valve seat is provided with a valve port, the second core iron moves in the sleeve to realize closing or opening of the valve port.

9. The protection device for a valve for refrigerant flow passage according to claim 1, characterized in that, ​ 10. The protection device for a valve for refrigerant flow passage according to claim 9, characterized in that, ​ 11. The protection device for a valve for refrigerant flow passage according to claim 10, wherein ​ 12. The protection device for a valve for refrigerant flow passage according to claim 11, characterized in that, ​

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