Modular double-seal structure for an explosion-proof electric appliance

Abstract

The utility model discloses a modularization double -layer sealing structure for explosion -proof electric appliance, include: first sealing cover is used for the outer wall of explosion -proof power distribution cabinet adhesion, second sealing cover sets up at one side of first sealing cover for the inner wall of explosion -proof power distribution cabinet adhesion, sealing connecting seat one end is installed on first sealing cover, and sealing connecting seat penetrates explosion -proof power distribution cabinet and second sealing cover, and sealing connecting seat is used for sealing the threading hole on explosion -proof power distribution cabinet. The utility model discloses through adopting the double -layer design of first sealing cover and second sealing cover, makes the sealing structure can adapt to the explosion -proof power distribution cabinet of different thickness, through the distance between the adjustment sealing seat and the inflation degree of air bag, the sealing structure can adapt to the cable or pipeline of different diameter, and tight adhesion between sealing material and opening is guaranteed simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of modular sealing, and in particular to a modular double-layer sealing structure for explosion-proof electrical appliances. Background Technology

[0002] Modular connection sealing structures utilize multiple independent sealing units (such as seals, gaskets, and glands) to form a complete sealing system. These units can be combined as needed to adapt to different sealing requirements. In the electrical industry, with the widespread application of explosion-proof electrical equipment, its safety and reliability have become crucial factors that cannot be ignored. Especially in potentially explosive environments, such as petrochemical and coal mining, the sealing performance of explosion-proof electrical equipment directly affects the safe operation of the entire system. As an advanced design concept, modular connection sealing structures have seen increasing application in explosion-proof electrical equipment in recent years due to their ease of installation, maintenance, and upgrades.

[0003] Existing modular connection sealing structures are often designed based on standardized opening sizes and shapes. However, the openings of older electrical equipment may be deformed due to age, design differences, or long-term use, making it impossible to perfectly match the newly designed sealing structure. Even if it can be installed with difficulty, gaps or irregular contact between the sealing material and the opening may seriously affect the sealing effect, thereby reducing the sealing performance. Utility Model Content

[0004] To address the aforementioned technical problems existing in existing modular connection sealing structures, this utility model provides a modular double-layer sealing structure for explosion-proof electrical appliances.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A modular double-layer sealing structure for explosion-proof electrical appliances includes: a first sealing cover for conforming to the outer wall of an explosion-proof distribution cabinet; a second sealing cover disposed on one side of the first sealing cover for conforming to the inner wall of the explosion-proof distribution cabinet; a sealing connector, one end of which is mounted on the first sealing cover, the sealing connector penetrating the explosion-proof distribution cabinet and the second sealing cover, the sealing connector being used to seal wiring holes on the explosion-proof distribution cabinet; the second sealing cover is configured to move on the sealing connector and move closer to or further away from the first sealing cover, for adapting to explosion-proof distribution cabinets of different thicknesses; and a second airbag mounted on the sealing connector, configured to inflate when the second sealing cover moves closer to the first sealing cover, for conforming to the inner wall of the explosion-proof distribution cabinet. On the inner wall of the wiring hole of the explosion-proof distribution cabinet; a second sealing sheet, installed on the second airbag, the second sealing sheet has a multi-layer peelable structure, each layer can be peeled off from the sealing seat to gradually reduce the thickness of the second sealing sheet; a through hole, which is opened through the sealing connection seat; two sealing seats, installed in the through hole, are symmetrically arranged, and the two sealing seats are set to be close to or far apart at the same time to seal the gap between the wiring hole and the wire harness; two first sealing sheets, respectively installed on the two sealing seats, the first sealing sheets have a multi-layer peelable structure, each layer can be peeled off from the sealing seat to gradually reduce the thickness of the first sealing sheet, and the effective sealing diameter of the sealing seat is adjusted to adapt to cables or pipes of different diameters.

[0007] Preferably, the sealing connector includes: two control grooves, respectively opened on the inner walls of both sides of the through hole, and two sealing seats respectively connected in the two control grooves; a first inflation groove, opened on the outer ring of the sealing connector, and the second airbag installed in the first inflation groove.

[0008] Preferably, the sealing structure further includes: an adjusting sleeve, sleeved on the sealing connecting seat, the adjusting sleeve being configured to drive the two sealing seats to move closer or further away simultaneously when rotated on the sealing connecting seat; and a limiting plate, threadedly connected to the adjusting sleeve, the limiting plate contacting the second sealing cover, the limiting plate being used to drive the second sealing cover closer to the first sealing cover.

[0009] Preferably, the adjusting sleeve includes: an internal gear installed on the inner ring of the adjusting sleeve; the sealing connection seat further includes: two fixing grooves formed on the outer wall of the sealing connection seat and arranged symmetrically; two control gears respectively installed in the two fixing grooves; two first bevel gears respectively installed on the two control gears; and two second bevel gears respectively disposed in the two fixing grooves, wherein the second bevel gears mesh with the first bevel gears.

[0010] Preferably, the sealing seat includes: a second inflation groove formed in the inner ring of the sealing seat; a first airbag installed in the second inflation groove, the first airbag contacting the first sealing sheet; an adjustment groove formed on one side of the sealing seat, with an inflation hole between the adjustment groove and the second inflation groove; a movable seat installed in the adjustment groove, with a second piston connected to one side of the movable seat, the second piston being disposed in the inflation hole; a second elastic element, one end of which is installed on the movable seat, and the other end of which is installed on the inner wall of the adjustment groove; and a lead screw, one end of which is connected to the movable seat, and the other end of which passes through the control groove and extends into the fixed groove to connect with the second bevel gear.

[0011] Preferably, the adjusting sleeve further includes a bearing, which is installed between the adjusting sleeve and the sealing connection seat.

[0012] Preferably, the sealing connection seat further includes: a groove formed on the inner wall of the first inflation groove; a first piston installed in the groove; a first elastic element, one end of which is connected to the first piston and the other end of which is connected to the inner wall of the groove; a moving hole formed on the inner wall of the groove; and a control rod disposed in the moving hole, one end of which is connected to the first piston and the other end of which is in contact with the second sealing cover.

[0013] Preferably, the second airbag includes: a plurality of peelable third sealing sheets, each of which can be peeled off from the second airbag to reduce the effective sealing diameter of the second airbag layer by layer.

[0014] Preferably, the first sealing cover includes: a first sealing ring, which is installed on one side of the first sealing cover and is in contact with the outer wall of the explosion-proof distribution cabinet.

[0015] Preferably, the second sealing cover includes a second sealing ring, which is installed on one side of the second sealing cover and fits against the inner wall of the explosion-proof distribution cabinet.

[0016] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0017] This solution employs a double-layer design with a first sealing cover and a second sealing cover, which respectively fit the outer and inner walls of the explosion-proof distribution cabinet. This not only enhances the sealing effect but also allows the sealing structure to adapt to explosion-proof distribution cabinets of different thicknesses through the mobility of the second sealing cover. By adjusting the distance between the sealing seats and the degree of airbag expansion, it can further adapt to cables or pipes of different diameters. Both the first and third sealing sheets adopt a multi-layer peelable structure, with each layer peelable from the sealing seat to gradually reduce the thickness of the sealing sheet, thereby adjusting the effective sealing diameter of the sealing seat and enabling the sealing structure to adapt to cables or pipes of different diameters. Attached Figure Description

[0018] Figure 1This is an assembly drawing of the first sealing cover and sealing connection seat proposed in this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of the first sealing cover, the sealing connection seat, and the second sealing cover proposed in this utility model.

[0020] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram from another perspective of the present invention.

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure proposed in this utility model.

[0023] Figure 6 This is an enlarged cross-sectional view of the sealing connector, sealing seat, and first sealing sheet proposed in this utility model.

[0024] Figure 7 This is an enlarged cross-sectional view of the second sealing cover, the limiting plate, and the adjusting sleeve proposed in this utility model.

[0025] Figure 8 This is an enlarged cross-sectional view of the first sealing cap, the sealing connecting seat, and the second airbag proposed in this utility model.

[0026] Figure 9 This is a cross-sectional view of the second airbag proposed in this utility model.

[0027] Figure 10 This is a schematic diagram of the adjusting sleeve, internal gear, and control gear structure proposed in this utility model.

[0028] The attached figures are labeled as follows:

[0029] 1. First sealing cap; 101. First sealing ring;

[0030] 2. Sealing connector; 201. Through hole; 202. Control groove; 203. First inflation groove; 204. Control gear; 205. First bevel gear; 206. Second bevel gear; 207. Groove; 208. First piston; 209. Control rod; 210. First elastic element;

[0031] 3. Second sealing cap; 301. Second sealing ring;

[0032] 4. Sealing seat; 401. Adjustment groove; 402. Second inflation groove; 403. First airbag; 404. Movable seat; 405. Second piston; 406. Second elastic element; 407. Lead screw;

[0033] 5. First sealing plate;

[0034] 6. Limit plate;

[0035] 7. Second airbag; 701. Second sealing plate;

[0036] 8. Adjusting sleeve; 801. Bearing; 802. Internal gear. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0038] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0039] Example 1

[0040] Reference Figures 1-10 A modular double-layer sealing structure for explosion-proof electrical appliances includes: a first sealing cover 1, which is used to fit against the outer wall of the explosion-proof distribution cabinet to ensure that impurities and moisture from the external environment will not enter the interior of the distribution cabinet through the connection, thereby improving the overall explosion-proof performance of the explosion-proof distribution cabinet; and a second sealing cover 3, which is located on one side of the first sealing cover 1 and is used to fit against the inner wall of the explosion-proof distribution cabinet, thereby further enhancing the sealing effect. Its movable design allows the structure to adapt to explosion-proof distribution cabinets of different thicknesses, improving the flexibility and versatility of installation.

[0041] The sealing connector 2 is installed on the first sealing cover 1 at one end. The sealing connector 2 passes through the explosion-proof distribution cabinet and the second sealing cover 3. The sealing connector 2 is used to seal the wire hole on the explosion-proof distribution cabinet. As a key component connecting the first sealing cover 1 and the second sealing cover 3, it passes through the explosion-proof distribution cabinet to effectively seal the wire hole and prevent leakage problems caused by the wires or pipes being threaded through. The second sealing cover 3 is set to move on the sealing connector 2 and move closer to or further away from the first sealing cover 1 to adapt to explosion-proof distribution cabinets of different thicknesses.

[0042] The second airbag 7, installed on the sealing connector 2, is configured to expand when the second sealing cover 3 approaches the first sealing cover 1, thus fitting tightly against the inner wall of the wiring hole in the explosion-proof distribution cabinet. This further enhances the sealing effect and ensures the safety of the interior of the explosion-proof distribution cabinet. The second sealing sheet 701, installed on the second airbag 7, has a multi-layer peelable structure, with each layer peelable from the sealing seat 4. The thickness of the second sealing sheet 701 is gradually reduced layer by layer; the through hole 201 is opened through the sealing connection seat 2 to provide a channel for the cable or pipe to be threaded, and at the same time, it works with the sealing seat 4 and the first sealing sheet 5 to achieve the sealing function; the two sealing seats 4 are installed in the through hole 201 and are symmetrically arranged. The two sealing seats 4 are set to be close to or far apart at the same time to seal the gap between the threading hole and the wire harness. By being close to or far apart at the same time, the wire harness can be clamped and tightly attached, thereby sealing the gap between the threading hole and the wire harness and preventing external impurities from entering.

[0043] Two first sealing plates 5 are respectively installed on two sealing seats 4. The first sealing plates 5 have a multi-layer peelable structure, and each layer can be peeled off from the sealing seat 4 to gradually reduce the thickness of the first sealing plate 5, thereby adjusting the effective sealing diameter of the sealing seat 4 to adapt to cables or pipes of different diameters. The multi-layer peelable structure allows the thickness of the first sealing plate 5 to be reduced layer by layer, thereby adjusting the effective sealing diameter of the sealing seat 4 to adapt to cables or pipes of different diameters, improving the versatility and flexibility of the sealing structure.

[0044] The sealing connector 2 includes: two control grooves 202, which are respectively opened on the inner walls of the two sides of the through hole 201, and two sealing seats 4 are respectively connected in the two control grooves 202; a first inflation groove 203 is opened on the outer ring of the sealing connector 2, and a second airbag 7 is installed in the first inflation groove 203. The first inflation groove 203 provides a channel for the inflation of the second airbag 7, ensuring that the second airbag 7 can be rapidly inflated when needed to achieve a sealing effect.

[0045] An adjusting sleeve 8 is fitted onto the sealing connection seat 2. The adjusting sleeve 8 is designed to rotate on the sealing connection seat 2, causing the two sealing seats 4 to move closer or further apart simultaneously. By rotating the adjusting sleeve 8, the sealing effect is adjusted, making the adjustment of the sealing structure simpler and faster. A limiting plate 6 is threaded onto the adjusting sleeve 8 and contacts the second sealing cover 3. The limiting plate 6 is used to move the second sealing cover 3 closer to the first sealing cover 1. When the limiting plate 6 rotates spirally on the adjusting sleeve 8, it can push the second sealing cover 3 closer to the first sealing cover 1, thereby ensuring that the first sealing cover 1 and the second sealing cover 3 can fit tightly against the explosion-proof distribution cabinet. The adjusting sleeve 8 includes: an internal gear 802 installed on the inner ring of the adjusting sleeve 8; and a bearing 801 installed between the adjusting sleeve 8 and the sealing connection seat 2. The design of the bearing 801 makes the rotation of the adjusting sleeve 8 smoother, reduces friction and wear, and improves the service life of the adjusting sleeve 8.

[0046] The sealing connection seat 2 also includes: two fixed grooves, which are symmetrically arranged on the outer wall of the sealing connection seat 2; two control gears 204, which are respectively installed in the two fixed grooves; two first bevel gears 205, which are respectively installed on the two control gears 204; and two second bevel gears 206, which are respectively set in the two fixed grooves. The second bevel gears 206 mesh with the first bevel gears 205. When the adjusting sleeve 8 is rotated, it can drive the internal gear 802 to rotate. The internal gear 802 can simultaneously drive the two control gears 204 to rotate. The control gears 204 drive the first bevel gears 205 to rotate. The first bevel gears 205 drive the second bevel gears 206 to rotate. Through the rotation of the second bevel gears 206, the lead screw 407 can be driven to rotate.

[0047] The sealing seat 4 includes: a second inflation groove 402, formed in the inner ring of the sealing seat 4; a first airbag 403, installed in the second inflation groove 402, the first airbag 403 contacting the first sealing sheet 5; an adjustment groove 401, formed on one side of the sealing seat 4, with an inflation hole between the adjustment groove 401 and the second inflation groove 402; a movable seat 404, installed in the adjustment groove 401, with a second piston 405 connected to one side of the movable seat 404, the second piston 405 being disposed in the inflation hole; a second elastic element 406, one end mounted on the movable seat 404, the other end mounted on the inner wall of the adjustment groove 401; and a lead screw 407, one end connected to the movable seat 404, the other end passing through the control groove 202 and extending into the fixed groove to connect with the second bevel gear 206. When the lead screw 407 rotates, it can drive the movable seat 404 to move, and the movable seat 404, connected by the second elastic element 406, drives the sealing seat 4 to move. The two sealing seats 4 can... After the wire harness passing through the explosion-proof distribution cabinet is clamped and the two sealing seats 4 come into contact, the moving seat 404 continues to move and moves within the adjusting groove 401. The moving seat 404 drives the second piston 405 to move, and the second piston 405 can squeeze gas into the second inflation groove 402, thereby causing the first airbag 403 to expand. After each layer of the multi-layer structure of the first sealing sheet 5 is torn off, its inner diameter may not completely fit with the outer diameter of the wire harness. For example, the inner diameter of the two first sealing sheets 5 after being joined together is 32mm, and the thickness of each layer is 2mm. If the diameter of the wire harness is 31mm at this time, and it is directly joined with the first sealing sheet 5, a gap will be caused between the two sealing seats 4. If one layer of the first sealing sheet 5 is torn off, the inner diameter of the two first sealing sheets 5 after being joined together is 30mm, and the first sealing sheet 5 cannot completely fit with the wire harness. In this case, the expansion of the first airbag 403 can be used to make the first sealing sheet 5 fit more tightly with the wire harness.

[0048] The sealing connection seat 2 further includes: a groove 207 formed on the inner wall of the first inflation groove 203; a first piston 208 installed in the groove 207; a first elastic element 210, one end of which is connected to the first piston 208 and the other end of which is connected to the inner wall of the groove 207; a moving hole formed on the inner wall of the groove 207; and a control rod 209 disposed in the moving hole, one end of which is connected to the first piston 208 and the other end of which is in contact with the second sealing cover 3. When the limiting plate 6 is rotated alone, the limiting plate 6 moves on the adjusting sleeve 8 with a threaded groove structure. The limiting plate 6 can push the second sealing cover 3 to move, and the second sealing cover 3 pushes the control rod 209. The control rod 209 drives the first piston 208 to move. Inflation can be applied to the first inflation slot 203 to inflate the second airbag 7, causing the second sealing plate 701 to fit more closely to the wiring hole of the explosion-proof distribution cabinet. For example, if the outer diameter of the second sealing plate 701 is 50mm and the thickness of each layer is 2mm, and the diameter of the wiring hole is 49mm, the second sealing plate 701 cannot enter the wiring hole when the sealing connector 2 is directly inserted into the wiring hole. If one layer of the second sealing plate 701 is torn off, the outer diameter of the second sealing plate 701 becomes 48mm, and the second sealing plate 701 cannot fit completely to the wiring hole. In this case, the expansion of the second airbag 7 can be used to make the second sealing plate 701 fit more tightly to the inner wall of the wiring hole. The first elastic element 210 and the second elastic element 406 are springs.

[0049] The second airbag 7 includes several peelable third sealing sheets, each of which can be peeled off from the second airbag 7 to reduce the effective sealing diameter of the second airbag 7 layer by layer.

[0050] Example 2

[0051] Reference Figures 3-4 The difference between this embodiment and embodiment one is that the first sealing cover 1 includes a first sealing ring 101, which is installed on one side of the first sealing cover 1 and is in contact with the outer wall of the explosion-proof distribution cabinet.

[0052] The second sealing cover 3 includes a second sealing ring 301, which is installed on one side of the second sealing cover 3 and fits against the inner wall of the explosion-proof distribution cabinet.

[0053] During use, prepare the first sealing cover 1 and the second sealing cover 3, ensuring that the first sealing ring 101 and the second sealing ring 301 are respectively installed on their respective sides to fit against the outer and inner walls of the explosion-proof distribution cabinet. Prepare the sealing connector 2, ensuring that the second airbag 7 is installed in the first inflation groove 203, which is located on the outer ring of the sealing connector 2. Prepare two sealing seats 4, ensuring that they are installed in the through hole 201 and arranged symmetrically. Install two first sealing pieces 5 on the sealing seats 4. The first sealing pieces 5 have a multi-layer peelable structure. Install one end of the sealing connector 2 onto the first sealing cover 1, ensuring that the through hole 201 is aligned with the explosion-proof distribution cabinet. The wiring hole of the electrical cabinet is used to place the second sealing cover 3 at the other end of the sealing connection seat 2, ensuring that it can move along the sealing connection seat 2 to accommodate explosion-proof distribution cabinets of different thicknesses. Depending on the thickness of the explosion-proof distribution cabinet, the adjusting sleeve 8 is rotated. The adjusting sleeve 8 drives two control gears 204 to rotate via the internal gear 802. The control gears 204 drive the first bevel gear 205 to rotate, and the first bevel gear 205 drives the second bevel gear 206 to rotate, thereby driving the lead screw 407 to rotate. The rotation of the lead screw 407 drives the moving seat 404 to move within the adjusting groove 401. The moving seat 404 is connected to the inner wall of the adjusting groove 401 via the second elastic element 406, thereby driving the two sealing... The two sealing seats 4 move closer or further apart to clamp and adhere tightly to the wire harness. After the two sealing seats 4 come into contact, the moving seat 404 continues to move and compresses gas into the second inflation groove 402 through the second piston 405, causing the first airbag 403 to inflate and ensuring that the first sealing plate 5 is tightly fitted to the wire harness. The limiting plate 6 is rotated and moves on the adjusting sleeve 8, pushing the second sealing cover 3 closer to the first sealing cover 1. When the second sealing cover 3 moves, the control rod 209 is pushed, and the control rod 209 drives the first piston 208 to move in the groove 207, inflating the first inflation groove 203 and causing the second airbag 7 to inflate, ensuring that the second sealing plate 701 is tightly fitted to the wire hole of the explosion-proof distribution cabinet. To adjust the effective sealing diameter of the sealing seat 4, the first sealing sheet 5 is peeled off layer by layer according to the diameter of the cable or pipe. Similarly, if the second sealing sheet 701 does not completely fit the wire hole, the third sealing sheet on the second airbag 7 can be peeled off layer by layer to reduce the effective sealing diameter of the second airbag 7. This ensures that the first sealing cover 1 and the second sealing cover 3 fit tightly on the explosion-proof distribution cabinet without gaps. It also ensures that the second airbag 7 and the first airbag 403 expand and fit tightly on the inner wall of the wire hole and the wire harness of the explosion-proof distribution cabinet. This ensures that the sealing seat 4 and the first sealing sheet 5 in the through hole 201 effectively seal the gap between the wire hole and the wire harness, preventing external impurities from entering.

[0054] In summary, compared with existing technologies, it has the following beneficial effects:

[0055] This solution employs a double-layer design with a first sealing cover 1 and a second sealing cover 3, which respectively adhere to the outer and inner walls of the explosion-proof distribution cabinet. This not only enhances the sealing effect but also allows the sealing structure to adapt to explosion-proof distribution cabinets of different thicknesses through the mobility of the second sealing cover 3. In particular, for older electrical equipment, the openings may deform due to long-term use. The double-layer sealing cover design of this solution can ensure a tight fit between the sealing material and the opening by adjusting the position of the second sealing cover 3, thereby solving the problem of poor sealing caused by deformation.

[0056] By adjusting the distance between the sealing seats 4 and the degree of air bladder expansion, it can further adapt to cables or pipes of different diameters, as well as the opening deformation caused by long-term use. This adjustability allows this solution to perfectly match the openings of old electrical equipment, ensuring that the sealing effect is not affected by the opening deformation.

[0057] Both the first sealing sheet 5 and the third sealing sheet adopt a multi-layer peelable structure. Each layer can be peeled off from the sealing seat 4 to gradually reduce the thickness of the sealing sheet, thereby adjusting the effective sealing diameter of the sealing seat 4. This allows the sealing structure to adapt to cables or pipes of different diameters, while ensuring a tight fit between the sealing material and the opening, reducing gaps and irregular contact, and thus improving sealing performance.

[0058] By adjusting the sleeve 8, controlling the gear 204, bevel gear, and lead screw 407, precise adjustment of the sealing seat 4 and the air bladder is achieved. This solution is applicable to various types and specifications of explosion-proof distribution cabinets and cables or pipes. Whether it is a standardized opening or a deformed opening caused by long-term use, this solution can provide excellent sealing performance.

[0059] Therefore, although the present invention has been described herein with reference to specific embodiments, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, some features of the present invention may be adopted without departing from the scope and spirit of the present invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention.

[0060] This invention is not intended to be limited to the specific terminology used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out this invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of this invention will be defined only by the appended claims.

Claims

1. A modular double-layer sealing structure for explosion-proof electrical appliances, characterized in that, include: The first sealing cover (1) is used to fit the outer wall of the explosion-proof distribution cabinet; The second sealing cover (3) is located on one side of the first sealing cover (1) and is used to fit against the inner wall of the explosion-proof distribution cabinet. A sealing connector (2) is installed at one end on the first sealing cover (1). The sealing connector (2) passes through the explosion-proof distribution cabinet and the second sealing cover (3). The sealing connector (2) is used to seal the wire hole on the explosion-proof distribution cabinet. The second sealing cover (3) is configured to move on the sealing connection seat (2) and move closer to or further away from the first sealing cover (1) to adapt to explosion-proof distribution cabinets of different thicknesses; The second airbag (7), installed on the sealing connection seat (2), is configured to expand when the second sealing cover (3) approaches the first sealing cover (1) to fit against the inner wall of the wiring hole of the explosion-proof distribution cabinet. The second sealing sheet (701) is installed on the second airbag (7). The second sealing sheet (701) has a multi-layer peelable structure, and each layer can be peeled off from the sealing seat (4) to reduce the thickness of the second sealing sheet (701) layer by layer. A through hole (201) is provided through the sealing connection seat (2).

2. The modular double-layer sealing structure for explosion-proof electrical appliances according to claim 1, characterized in that, The sealing connector (2) includes: Two sealing seats (4) are installed in the through hole (201) and are arranged symmetrically. The two sealing seats (4) are set to be close to or far apart at the same time to seal the gap between the wire hole and the wire harness. Two first sealing plates (5) are respectively installed on two sealing seats (4). The first sealing plate (5) has a multi-layer peelable structure. Each layer can be peeled off from the sealing seat (4) to gradually reduce the thickness of the first sealing plate (5) and adjust the effective sealing diameter of the sealing seat (4) to adapt to cables or pipes of different diameters. Two control slots (202) are respectively opened on the inner walls of the two sides of the through hole (201), and two sealing seats (4) are respectively connected in the two control slots (202); The first inflation groove (203) is formed on the outer ring of the sealing connector (2), and the second airbag (7) is installed in the first inflation groove (203).

3. The modular double-layer sealing structure for explosion-proof electrical appliances according to claim 2, characterized in that, The sealing structure also includes: An adjusting sleeve (8) is fitted onto the sealing connection seat (2). The adjusting sleeve (8) is configured to rotate on the sealing connection seat (2) to drive the two sealing seats (4) to move closer or further away simultaneously. The limiting plate (6) is threadedly connected to the adjusting sleeve (8). The limiting plate (6) contacts the second sealing cover (3). The limiting plate (6) is used to drive the second sealing cover (3) closer to the first sealing cover (1). The adjusting sleeve (8) includes: An internal gear (802) is installed on the inner ring of the adjusting sleeve (8); The sealing connector (2) further includes: Two fixing grooves are formed on the outer wall of the sealing connection seat (2) and are arranged symmetrically; Two control gears (204) are respectively installed in two fixed slots; Two first bevel gears (205) are respectively mounted on two control gears (204); Two second bevel gears (206) are respectively disposed in two fixed slots, and the second bevel gears (206) mesh with the first bevel gear (205).

4. The modular double-layer sealing structure for explosion-proof electrical appliances according to claim 3, characterized in that, The sealing seat (4) includes: The second inflation groove (402) is formed in the inner ring of the sealing seat (4); The first airbag (403) is installed in the second inflation groove (402), and the first airbag (403) is in contact with the first sealing sheet (5); An adjustment groove (401) is provided on one side of the sealing seat (4), and an inflation hole is provided between the adjustment groove (401) and the second inflation groove (402); A movable seat (404) is installed in the adjustment groove (401), and a second piston (405) is connected to one side of the movable seat (404). The second piston (405) is disposed in the air inlet. The second elastic element (406) is mounted on the movable seat (404) at one end and on the inner wall of the adjusting groove (401) at the other end. The lead screw (407) is connected at one end to the movable seat (404) and at the other end through the control groove (202) and extends into the fixed groove to be connected to the second bevel gear (206).

5. The modular double-layer sealing structure for explosion-proof electrical appliances according to claim 3, characterized in that, The adjusting sleeve (8) also includes: The bearing (801) is installed between the adjusting sleeve (8) and the sealing connection seat (2).

6. The modular double-layer sealing structure for explosion-proof electrical appliances according to claim 2, characterized in that, The sealing connector (2) further includes: A groove (207) is formed on the inner wall of the first inflation groove (203); The first piston (208) is installed in the groove (207); The first elastic element (210) is connected at one end to the first piston (208) and at the other end to the inner wall of the groove (207); A movable hole is formed on the inner wall of the groove (207); A control lever (209) is disposed in the movable hole. One end of the control lever (209) is connected to the first piston (208), and the other end is in contact with the second sealing cover (3).

7. A modular double-layer sealing structure for explosion-proof electrical appliances according to claim 1, characterized in that, The second airbag (7) includes: Several peelable third sealing strips, each of which can be peeled off from the second airbag (7), thereby reducing the effective sealing diameter of the second airbag (7) layer by layer.

8. The modular double-layer sealing structure for explosion-proof electrical appliances according to claim 1, characterized in that, The first sealing cover (1) includes: a first sealing ring (101), which is installed on one side of the first sealing cover (1) and the first sealing ring (101) is in contact with the outer wall of the explosion-proof distribution cabinet; The second sealing cover (3) includes a second sealing ring (301), which is installed on one side of the second sealing cover (3) and is in contact with the inner wall of the explosion-proof distribution cabinet.

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