Composite sealing structure of SF6 gas leakage monitoring device

Abstract

The utility model discloses a composite sealing structure of an SF6 gas leakage monitoring device, which comprises a shell, a first sealing layer and a second sealing layer, and is characterized in that the shell comprises a first shell and a second shell, and the first shell and the second shell are spliced to form a closed space; the first sealing layer and the second sealing layer are arranged on the inner side and the outer side of the splicing position of the first shell and the second shell respectively, a through hole communicating the interior and the exterior of the shell is formed in the splicing position, and the through hole is covered with the first sealing layer and the second sealing layer. According to the embodiment of the invention, internal and external dual sealing at the splicing part of the shell is realized, and the first sealing layer on the inner side is thoroughly isolated from external rainwater and humid air, so that the first sealing layer on the inner side is prevented from aging.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a composite sealing structure of an SF6 gas leakage monitoring device. Background Art

[0002] As a key device for monitoring the density and leakage amount / rate of SF6 gas in electrical equipment, the working performance of the SF6 gas leakage monitoring device directly affects the safe operation reliability of electrical equipment. The existing housing of the SF6 gas leakage monitoring device is mainly composed of front and rear housings spliced together. A sealing ring groove is generally provided at the connection. After the two side housings are fastened, sealant is applied in the sealing ring groove and a sealing tape is pasted. However, the SF6 gas leakage monitoring device is generally installed outdoors. After long-term exposure to wind, sun, rain and moisture, the sealing tape and sealant may age, fall off and fail, resulting in a decline in the water vapor isolation performance. Rainwater and humid air will enter the device interior along the gaps. The interior of the SF6 gas leakage monitoring device generally consists of modules such as a high-precision pressure sensor, a precision chip, a circuit board, etc. After the modules are affected by moisture, it may lead to short circuits, oxidation and detachment of solder joints, abnormal resistor and capacitor components, etc., resulting in abnormal density and leakage monitoring of the device. Summary of the Utility Model

[0003] An embodiment of the utility model discloses a composite sealing structure of an SF6 gas leakage monitoring device, which is used to solve the problem that the sealant and sealing tape at the connection of the front and rear housings of the existing SF6 gas leakage monitoring device are prone to aging, falling off and failure.

[0004] An embodiment of the utility model provides a composite sealing structure of an SF6 gas leakage monitoring device, including a housing, a first sealing layer and a second sealing layer. The housing includes a first housing and a second housing. The first housing and the second housing are spliced to form a sealed space. The first sealing layer and the second sealing layer are respectively arranged on the inner side and the outer side of the splicing part of the first housing and the second housing. A through hole communicating the inside and outside of the housing is provided at the splicing part. The through hole is used to pass through the first sealing layer, and the second sealing layer covers the through hole.

[0005] Further, a first annular limiting space is provided on the splicing surface of the first housing, and a second annular limiting space is provided on the splicing surface of the second housing. The first annular limiting space and the second annular limiting space are correspondingly arranged. After the first annular limiting space and the second annular limiting space are spliced, an inner channel is formed. The first sealing layer is filled in the inner channel and completely covers the inner gap at the splicing part.

[0006] Further, the through hole includes an injection hole which communicates with the inner channel. The first sealing layer is made of a thermosetting sealing material and is used to be injected in a liquid form from the through hole and filled into the inner channel and form a solid form in the inner channel.

[0007] Further, a first annular plate is provided at the first annular limiting space of the first housing. One end of the first annular plate is connected to the first housing, and the second end of the first annular plate protrudes from the splicing surface of the first housing. When the first housing and the second housing are spliced, the second end of the first annular plate extends into the second annular limiting space and abuts against the second housing. The first annular plate is used to isolate the inner channel from the closed space and prevent the first sealing layer in a liquid form from flowing from the inner channel into the closed space.

[0008] Further, an elastic layer is provided at the abutting portion between the second end of the first annular plate and the second housing.

[0009] Further, a second annular plate is provided at the second annular limiting space of the first housing. After the first housing and the second housing are spliced, the second annular plate is located between the first annular plate and the closed space. The second annular plate is used to block the first sealing layer in a liquid form from flowing from the abutting portion between the first annular plate and the second housing into the closed space.

[0010] Further, the through hole further includes an overflow hole. The injection hole is provided at one end of the outer shell, and the overflow hole is provided at the other end of the outer shell. The overflow hole is used for the first sealing layer in a liquid form to overflow from the overflow hole after the inner channel is filled.

[0011] Further, corresponding first and second steps are respectively provided on the outer sides of the first housing and the second housing near the splicing portion. The first step and the second step form an outer channel after the first housing and the second housing are spliced. Both the injection hole and the overflow hole are provided in the outer channel. The second sealing layer is provided in the outer channel. The outer channel is used to limit the second sealing layer to ensure that the second sealing layer covers the outer gap at the splicing portion and the injection hole and the overflow hole.

[0012] Further, the second sealing layer includes multiple layers of sealing tapes wound around the outer channel.

[0013] Further, it further includes a fastener. The first housing is provided with a plurality of first fixing holes, and the second housing is provided with a plurality of second fixing holes. The first fixing holes and the second fixing holes are correspondingly arranged and respectively penetrate through the splicing surface of the first housing and the second housing. Both the first fixing holes and the second fixing holes are arranged between the inner channel and the outer channel. The fastener is used to sequentially pass through the first fixing holes and the second fixing holes to realize the splicing of the first housing and the second housing.

[0014] It can be seen from the combined technical solution that the embodiments provided by the present invention have the following advantages: By respectively arranging a first sealing layer and a second sealing layer on the inner and outer sides of the splicing part of the first housing and the second housing, double sealing inside and outside the splicing part is realized. The first sealing layer further covers the through holes communicated with the second sealing layer, so that the inner first sealing layer is completely isolated from external rainwater and humid air, and the aging of the inner first sealing layer is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of an SF6 gas leakage monitoring device provided in an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the first housing of a composite sealing structure of an SF6 gas leakage monitoring device provided in an embodiment of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the second housing of a composite sealing structure of an SF6 gas leakage monitoring device provided in an embodiment of the present invention;

[0019] Figure 4 It is a schematic diagram of the structure of the inner channel of a composite sealing structure of an SF6 gas leakage monitoring device provided in an embodiment of the present invention.

[0020] DESCRIPTION OF THE REFERENCE NUMERALS

[0021] 1. First housing; 2. Second housing; 3. Joint surface; 4. First annular limiting space; 5. Second annular limiting space; 6. Injection hole; 7. First annular plate; 8. Second annular plate; 9. Inner channel; 10. First step; 11. Second step; 12. Outer channel; 13. First fixing hole; 14. Second fixing hole; 15. Temperature sensor; 16. Display screen; 17. Indicator light; 18. Air inlet pipe; 19. Power jack; 20. Data remote transmission module; 21. Part of the housing wall surface; 22. First step surface; 23. Second step surface. Detailed implementation manner

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0026] An SF6 gas leakage monitoring device provided by an embodiment of the present utility model, as Figure 1 shown, includes a housing, and modules such as a high-precision pressure sensor, a precision chip, and a circuit board arranged inside the housing. A circular display screen 16 is designed in the middle of the housing panel, and the indicator light 17 is directly below the display screen; a temperature sensor 15 is installed on the left side of the rear shell, the data remote transmission module 20 is above the right side, the power jack 19 is below, and the air inlet pipe 18 is at the bottom.

[0027] An embodiment of the present utility model provides a composite sealing structure for an SF6 gas leakage monitoring device, as Figures 1-4 shown, which includes a housing, a first sealing layer and a second sealing layer. The housing includes a first housing 1 and a second housing 2. The first housing 1 and the second housing 2 are spliced to form a closed space. The first sealing layer and the second sealing layer are respectively arranged on the inner side and the outer side of the splicing part of the first housing 1 and the second housing 2. A through hole communicating the inside and the outside of the housing is arranged at the splicing part. The through hole is used to pass through the first sealing layer, and the second sealing layer covers the through hole.

[0028] It can be understood that in specific implementation, by respectively arranging the first sealing layer and the second sealing layer on the inner side and the outer side of the splicing part of the first housing 1 and the second housing 2, double sealing is realized. The first sealing layer further covers the through hole communicated with the second sealing layer, so that the inner first sealing layer is completely isolated from external rainwater and humid air, and the aging of the inner first sealing layer is avoided.

[0029] In a more specific embodiment, a first annular limiting space 4 is arranged on the splicing surface 3 of the first housing 1, and a second annular limiting space 5 is arranged on the splicing surface 3 of the second housing 2. The first annular limiting space 4 and the second annular limiting space 5 are correspondingly arranged. After the first housing 1 and the second housing 2 are spliced, the first annular limiting space 4 and the second annular limiting space 5 are spliced to form an inner channel 9. The first sealing layer is filled in the inner channel 9 and completely covers the inner gap at the splicing part.

[0030] It can be understood that in specific implementation, by respectively arranging the first annular limiting space 4 and the second annular limiting space 5 at the splicing surface 3 of the first housing 1 and the second housing 2, the two annular limiting spaces are combined to form an inner channel 9 for filling the first sealing layer, so that the first sealing layer can cover the inner gap at the splicing part of the first housing 1 and the second housing 2, and the first sealing layer can effectively block external gas from entering the closed space through the gap at the splicing part.

[0031] It should be noted that both the first housing 1 and the second housing 2 are formed by a housing plane part and a housing wall part vertically connected to the periphery of the housing plane part to form an open box body. The splicing of the first housing 1 and the second housing 2 means connecting and combining the open edges or corresponding housing wall parts of the two open box bodies to form a complete closed box body. The housing wall part has a certain thickness, and the end surface of the housing wall part formed by the thickness of the housing wall part is the splicing surface 3 of the housing. When the first housing 1 and the second housing 2 are spliced, the splicing surfaces 3 of the first housing 1 and the second housing 2 coincide.

[0032] In a more specific embodiment, the first annular limiting space is a first annular groove, and the second annular limiting space is a second annular groove. The first annular groove and the second annular groove are correspondingly arranged. After the first annular groove and the second annular groove are spliced, an inner channel is formed, and the first sealing layer is filled in the inner channel and completely covers the inner gap at the splicing position.

[0033] In a more specific embodiment, the through hole includes an injection hole 6, the injection hole 6 communicates with the inner channel 9, the first sealing layer is made of a thermosetting sealing material, and the first sealing layer is used to be injected from the injection hole 6 in a liquid form and filled into the inner channel 9 and form a solid state after the inner channel 9 cools down.

[0034] It can be understood that during specific implementation, by using a thermosetting sealing material, the first sealing layer is injected and filled into the inner channel 9 in a liquid form, and a solid sealing layer is formed in the inner channel 9. The liquid sealing material can spread freely along the shape of the flow channel and form a solid sealing layer that completely fits the inner wall after curing, significantly reducing the leakage risk. At the same time, by injecting the first sealing layer from the injection hole 6, the installation process of the internal sealing layer is effectively simplified.

[0035] In a more specific embodiment, the thermosetting sealing material includes silicone rubber sealant. The property of the silicone rubber sealant changing from liquid to solid can be classified as the curing characteristic of thermosetting materials in the field of materials science. The essence of its liquid-to-solid change is that molecular chains form a three-dimensional network structure through chemical bonds (such as silicon-oxygen bonds), and this process is called cross-linking reaction. Since the network structure formed after cross-linking cannot be destroyed by heating (irreversible), it belongs to the curing mechanism of thermosetting materials. The performance of this material is high elasticity, chemical corrosion resistance, and resistance to high and low temperatures, which can effectively resist high-temperature and high-humidity weather, reduce the risk of aging of the first sealing layer, avoid abnormal device density and leakage monitoring, and provide good sealing performance.

[0036] In a more specific embodiment, a first annular plate 7 is provided at the first annular limiting space 4 of the first housing 1. One end of the first annular plate 7 is connected to the first housing 1, and the second end of the first annular plate 7 protrudes from the splicing surface 3 of the first housing 1. When the first housing 1 and the second housing 2 are spliced, the second end of the first annular plate 7 extends into the second annular limiting space 5 and abuts against the second housing 2. The first annular plate 7 is used to isolate the inner channel 9 from the enclosed space and prevent the first sealing layer in liquid form from flowing into the enclosed space from the inner channel 9.

[0037] It can be understood that, in specific implementation, an annular plate higher than the splicing surface 3 is provided at the first annular limiting space 4 of the first housing 1, and after the first housing 1 and the second housing 2 are spliced, the annular plate is inserted into the bottom of the second annular limiting space 5 to isolate the inner channel 9 from the closed space, avoiding the first sealing layer in liquid form from flowing into the closed space through the inner channel 9, and realizing the stable curing of the liquid sealing layer in the inner channel 9.

[0038] It should be noted that a first step surface 22 lower than the splicing surface 3 is provided at the splicing surface 3 of the first housing 1. One side of the first step surface 22 is connected to a partial housing wall surface 21 of the first housing 1, and the other side of the first step surface 22 is connected to the first annular plate 7. The first annular plate 7, the partial housing wall surface 21 and the first step 10 form a first annular groove, and this first annular groove is the first annular limiting space 4;

[0039] A second step surface 23 lower than the splicing surface 3 is provided at the splicing surface 3 of the second housing 2. One side of the second step surface 23 is connected to a partial housing wall surface 21 of the second housing 2. When the first housing 1 and the second housing 2 are spliced, the first annular plate 7 of the first housing 1 abuts against the other side of the second step surface 23. During splicing, the first annular plate 7, the second step surface 23 and the partial housing wall surface 21 of the second housing 2 form a second annular limiting space 5. Therefore, in this embodiment, when the first housing 1 and the second housing 2 are spliced, the first annular plate 7, the partial housing wall surfaces 21 of the first housing 1 and the second housing 2, the first step surface 22 and the second step surface 23 form a closed inner channel 9.

[0040] In a more specific embodiment, an elastic layer is provided at the abutting portion of the second end of the first annular plate 7 and the second housing 2.

[0041] It can be understood that, in specific implementation, by providing the elastic layer, the abutting tightness between the first annular plate 7 and the second housing 2 is further increased.

[0042] In a more specific embodiment, the elastic layer is a washer.

[0043] In a more specific embodiment, a second annular plate 8 is provided at the second annular limiting space 5 of the first housing 1. After the first housing 1 and the second housing 2 are spliced, the second annular plate 8 is located between the first annular plate 7 and the closed space, and the second annular plate 8 is used to block the first sealing layer in liquid form from flowing into the closed space from the abutting portion of the first annular plate 7 and the second housing 2.

[0044] It can be understood that, in specific implementation, such as Figure 4As shown, in order to further prevent the liquid first sealing layer from entering the inside of the housing through the contact portion between the first annular plate 7 and the second housing 2 and contaminating the components inside the housing. In this embodiment, a second annular plate 8 is provided at the second annular limiting space 5, and the second annular plate 8 is disposed between the first annular plate 7 and the sealed space. The second annular plate 8 can prevent the first sealing layer in liquid form from flowing into the sealed space from the contact portion between the first annular plate 7 and the second housing 2.

[0045] It should be noted that one end of the second annular plate 8 is connected to the second step surface 11 of the second housing 2. After the first housing 1 and the second housing 2 are spliced, the first annular plate 7 and the second annular plate 8 overlap to form the first sealing protection for isolating the sealed space inside the housing from the outside of the housing.

[0046] In a more specific embodiment, the through hole further includes an overflow hole. The injection hole 6 is provided at one end of the outer housing, and the overflow hole is provided at the other end of the outer housing. The overflow hole is used for the first sealing layer in liquid form to overflow from the overflow hole after filling the inner channel 9.

[0047] In a more specific embodiment, the injection hole 6 is provided at the top of the outer housing, and the overflow hole is provided at the bottom of the outer housing.

[0048] It can be understood that during specific implementation, by providing the overflow hole, it is judged whether the inner channel 9 is filled with the first sealing layer in liquid form. The specific principle is as follows: When the SF6 gas leakage monitoring device is assembled, after the first housing 1 and the second housing 2 are tightly spliced, they are placed vertically, and the liquid first sealing layer is injected into the inner channel 9 from the injection hole 6 at the top with a syringe. When the bottom overflow hole evenly and stably discharges glue for a certain period of time, it is considered that the inner channel 9 is filled with the liquid sealant.

[0049] In a more specific embodiment, the outer sides of the first housing 1 and the second housing 2 near the splicing portion are respectively provided with corresponding first steps 10 and second steps 11. The first step 10 and the second step 11 form an outer channel 12 after the first housing 1 and the second housing 2 are spliced. The injection hole 6 and the overflow hole are both provided at the outer channel 12. The second sealing layer is provided in the outer channel 12. The outer channel 12 is used to limit the second sealing layer to ensure that the second sealing layer covers the outer gap at the splicing portion as well as the injection hole 6 and the overflow hole.

[0050] It can be understood that during specific implementation, by providing the outer channel 12 for limiting the second sealing layer, it is ensured that the second sealing layer covers the outer gap at the splicing portion as well as the injection hole 6 and the overflow hole.

[0051] In a more specific embodiment, the second sealing layer includes multiple layers of sealing tapes wound around the outer channel 12.

[0052] It can be understood that in specific implementation, the second sealing layer is formed by winding multiple layers of sealing tapes around the outer channel 12. While the sealing tapes are used to achieve sealing, they further reinforce the connection between the first housing 1 and the second housing 2 by means of winding. And when it is found that the outer sealing tapes are damaged or aged, it is convenient for later maintenance and replacement, completely avoiding the inner first sealing layer from contacting with water vapor and aging.

[0053] In a more specific embodiment, sealing glue is applied to the outer gap at the splicing joint, and the sealing glue uses TPE glue. It can be understood that in specific implementation, on the one hand, it can increase the adhesion between the second sealing layer and the outer gap, and on the other hand, it seals the outer gap.

[0054] In a more specific embodiment, it further includes fasteners. The first housing 1 is provided with multiple first fixing holes 13, and the second housing 2 is provided with multiple second fixing holes 14. The first fixing holes 13 and the second fixing holes 14 are correspondingly arranged and respectively penetrate the splicing surface 3 of the first housing 1 and the second housing 2. Both the first fixing holes 13 and the second fixing holes 14 are arranged between the inner channel 9 and the outer channel 12. The fasteners are used to sequentially pass through the first fixing holes 13 and the second fixing holes 14 to realize the splicing of the first housing 1 and the second housing 2.

[0055] It can be understood that in specific implementation, by the fasteners passing through the first fixing holes 13 and the second fixing holes 14, the fasteners can guide the accurate splicing of the first housing 1 and the second housing 2, and form accurate inner channel 9 and outer channel. Both the first fixing holes 13 and the second fixing holes 14 are arranged between the inner channel 9 and the outer channel 12. On the one hand, it can reserve a replacement space for the second sealing layer, and on the other hand, it can balance the forces on the inner and outer gaps, avoiding excessive or too small force on a single-side gap and increasing the sealing difficulty.

[0056] In a more specific embodiment, the first fixing holes 13 and the second fixing holes 14 are screw holes, and the fasteners are screws or bolts.

[0057] The installation process of the sealing structure in this embodiment is as follows:

[0058] When the SF6 gas leakage monitoring device is assembled, after the first fixing holes 13 and the second fixing holes 14 of the first housing 1 are aligned and the first housing 1 and the second housing 2 are tightly spliced by fasteners, it is placed vertically. Liquid sealing glue is injected into the inner channel 9 from the injection hole 6 at the top with a syringe. When the glue overflows evenly and stably from the overflow hole at the bottom for a certain period of time, it is considered that the inner channel 9 is filled with liquid sealing glue. After the liquid sealing glue in the inner channel 9 solidifies, a first sealing layer is formed. Then, glue is applied to the outer gap at the splicing joint of the first housing 1 and the second housing 2, and finally, multiple layers of sealing tapes are wound around the outer channel 12 to form a second sealing layer.

[0059] In summary, in the embodiment of the present utility model, the first annular plate 7 and the second annular plate 8 cooperate to isolate the sealed space and the inner channel 9, forming the first seal; a first sealing layer is formed in the inner channel 9 to cover the inner gap at the joint of the first housing and the second housing, forming the second seal, and glue is applied to the outer gap at the joint and a second sealing layer is wound in the outer channel 12 to form the third seal. Through the multi-layer composite sealing method, the inner first sealing layer is effectively prevented from directly contacting the external environment, reducing the oxidation and corrosion of the inner first sealing layer by the complex external environment, and improving the water vapor tightness of the device under long-term operating conditions.

[0060] It should be noted that the terms describing the positional relationship in the above examples and drawings are only for illustrative purposes and should not be construed as a limitation to this patent; the above various embodiments of the present utility model are merely examples given to clearly illustrate the present utility model and are not intended to limit the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A composite sealing structure for an SF6 gas leakage monitoring device, characterized in that, It includes a housing, a first sealing layer and a second sealing layer. The housing includes a first housing body and a second housing body. The first housing body and the second housing body are spliced to form a sealed space. The first sealing layer and the second sealing layer are respectively arranged on the inner side and the outer side of the splicing part of the first housing body and the second housing body. A through hole communicating the inside and the outside of the housing is arranged at the splicing part. The through hole is used to pass through the first sealing layer, and the second sealing layer covers the through hole.

2. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 1, characterized in that, A first annular limiting space is arranged on the splicing surface of the first housing body, and a second annular limiting space is arranged on the splicing surface of the second housing body. The first annular limiting space and the second annular limiting space are arranged correspondingly. After the first annular limiting space and the second annular limiting space are spliced, an inner channel is formed. The first sealing layer is filled in the inner channel and completely covers the inner gap at the splicing part.

3. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 2, characterized in that, The through hole includes an injection hole which communicates with the inner channel. The first sealing layer is made of a thermosetting sealing material. The first sealing layer is used to be injected in a liquid form from the injection hole, filled into the inner channel and formed in a solid form in the inner channel.

4. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 3, characterized in that, A first annular plate is arranged at the first annular limiting space of the first housing body. One end of the first annular plate is connected to the first housing body, and the second end of the first annular plate protrudes from the splicing surface of the first housing body. When the first housing body and the second housing body are spliced, the second end of the first annular plate extends into the second annular limiting space and abuts against the second housing body. The first annular plate is used to isolate the inner channel from the sealed space to prevent the first sealing layer in a liquid form from flowing into the sealed space from the inner channel.

5. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 4, characterized in that, An elastic layer is arranged at the abutting part between the second end of the first annular plate and the second housing body.

6. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 4 or 5, characterized in that, A second annular plate is arranged at the second annular limiting space of the first housing body. After the first housing body and the second housing body are spliced, the second annular plate is located between the first annular plate and the sealed space. The second annular plate is used to block the first sealing layer in a liquid form from flowing into the sealed space from the abutting part between the first annular plate and the second housing body.

7. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 3, characterized in that, The through hole further includes an overflow hole. The injection hole is arranged at one end of the housing, and the overflow hole is arranged at the other end of the housing. The overflow hole is used to overflow when the inner channel is filled with the first sealing layer in a liquid form.

8. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 7, characterized in that, Correspondingly, a first step and a second step are respectively arranged on the outer sides of the first housing body and the second housing body close to the splicing part. After the first housing body and the second housing body are spliced, the first step and the second step form an outer channel. Both the injection hole and the overflow hole are arranged in the outer channel. The second sealing layer is arranged in the outer channel. The outer channel is used to limit the second sealing layer to ensure that the second sealing layer covers the outer gap at the splicing part as well as the injection hole and the overflow hole.

9. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 8, characterized in that, The second sealing layer includes multiple sealing tapes wound around the outer channel.

10. The composite sealing structure of an SF6 gas leakage monitoring device according to claim 9, characterized in that, It further includes a fastener. The first housing is provided with a plurality of first fixing holes, and the second housing is provided with a plurality of second fixing holes. The first fixing holes and the second fixing holes are correspondingly arranged and respectively penetrate through the splicing surface of the first housing and the second housing. Both the first fixing holes and the second fixing holes are arranged between the inner channel and the outer channel. The fastener is used to sequentially pass through the first fixing holes and the second fixing holes to realize the splicing of the first housing and the second housing.

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