Tension body welded flange joint type compression seal explosion-proof waterproof terminal box

Abstract

The utility model provides a kind of stretch body welded flange loose joint type compression sealing explosion-proof waterproof junction box, including junction box seat and junction box cover, junction box seat includes explosion-proof flange and junction box stretch body, explosion-proof flange has annular step at its bottom;Junction box stretch body has first section, second section and third section sequentially connected from bottom to top and by stretch forming, the outer wall of first section has at least one flat part, flat part is more conducive to welding fixed joint body assembly.Let the flat part of first section have flared mouth shape second section by stretch forming when stretching, then stretch forming circular flange mouth second section, the circular flange mouth of third section is abutted on annular step, and is welded fixed with explosion-proof flange, such that processing is more fast and convenient, more firm, improve quality, reduce production cost, various performance can meet the requirement of explosion-proof standard.

Description

Technical Field

[0001] This utility model relates to the field of junction box technology, specifically to a tensile body welded flange union type compression sealing explosion-proof and waterproof junction box. Background Technology

[0002] In the prior art, explosion-proof junction boxes are used in flammable and explosive gas environments such as oil and gas extraction, oil refining, chemical industry, offshore oil platforms, and oil tankers. They are also used in flammable and explosive gas environments and explosive dust environments such as military industry, ports, grain processing and storage, and metal processing for the connection of lighting, power and control circuits.

[0003] Currently, most mainstream products adopt the one-piece die-casting process of aluminum alloy, which has the advantage of lightweighting, but has significant drawbacks: on the one hand, aluminum alloy materials are prone to plastic deformation under extreme working conditions or mechanical impact, which seriously affects the explosion-proof performance; on the other hand, aluminum alloys are extremely prone to electrochemical corrosion in humid, flammable and explosive gas environments, which further weakens the structural strength and accelerates the aging of seals; in addition, some companies have tried to use stainless steel 304 and carbon steel Q235. Since stainless steel 304 and carbon steel Q235 are precision cast one-piece parts, the one-piece parts can only be machined by tapping, which is not only costly, but also of relatively low quality. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defects in the prior art, thereby providing a tensile welded flange union type compression sealing explosion-proof and waterproof junction box with good explosion-proof performance and low cost.

[0005] Therefore, this utility model provides a tension-body welded flange union type compression sealing explosion-proof and waterproof junction box, including a junction box base and a junction box cover. The junction box base includes an explosion-proof flange and a junction box tension body. The explosion-proof flange has an annular step at its bottom. The junction box tension body has a first section, a second section and a third section connected from bottom to top and formed by stretching. The outer wall of the first section has at least one flat part, on which a connector assembly is welded and fixed. The second section is flared, and the third section is a circular flange opening. The circular flange opening of the third section abuts against the annular step and is welded and fixed to the explosion-proof flange.

[0006] The outer wall of the first section has multiple staggered planar and curved sections.

[0007] The explosion-proof flange is either a gate-type explosion-proof flange or a threaded-type explosion-proof flange; the junction box cover is either a gate-type junction box cover or a threaded-type junction box cover.

[0008] A horizontal mounting foot is welded and fixed to one of the flat parts.

[0009] The junction box cover is equipped with a connector assembly, and a vertical mounting foot is welded and fixed on one of the curved surfaces.

[0010] A grounding bracket is welded onto the curved surface, and an external grounding screw and a grounding mark are installed on the grounding bracket. An internal grounding nut is welded to the bottom of the junction box base, and a grounding mark is installed thereon.

[0011] The connector assembly includes: a first connector body, one end of which is welded to a flat portion and the other end is provided with a first step, and a first sealing ring is installed inside the first connector body; a union nut, having a second step and a first internal thread section, the second step corresponding to and abutting the first step; and a first clamping nut, having a first external thread section threadedly connected to the first internal thread section, and a crimping section extending into the first connector body and abutting the first sealing ring, the first clamping nut being provided with an internal thread.

[0012] The first sealing ring is a conical sealing ring or a horn-shaped sealing ring.

[0013] The connector assembly includes: a second connector body having a second internal thread section, and a second sealing ring installed inside the second connector body; a second clamping nut having a second external thread section connected to the second internal thread section; and a PTFE bushing clamping gasket disposed between the second sealing ring and the second external thread section, comprising a metal gasket and an L-shaped bushing. The metal gasket includes a gasket body and a third step and a fourth step respectively disposed at both ends of the outer wall of the gasket body. The L-shaped bushing has a bushing body clampingly fitted onto the outer wall of the gasket body and a flange disposed at one end of the bushing body. The third step abuts against the second sealing ring, and the fourth step abuts against the end of the bushing body away from the flange. The two sides of the flange abut against the third step and the second external thread section respectively.

[0014] The second sealing ring is a conical sealing ring or a horn-shaped sealing ring.

[0015] The junction box cover includes a cover plate and a connecting sleeve welded and fixed to the cover plate. The connecting sleeve is a stop sleeve or a threaded sleeve.

[0016] The technical solution of this utility model has the following advantages:

[0017] 1. This utility model provides a tension-body welded flange union-type compression-sealed explosion-proof and waterproof junction box. The junction box base includes an explosion-proof flange and a tension body. The explosion-proof flange has an annular step at its bottom. The tension body has a first section, a second section, and a third section connected sequentially from bottom to top and formed by tension. The outer wall of the first section has at least one flat portion, which is more conducive to welding and fixing the connector assembly. During tensioning, the flat portion of the first section is first stretched into a second section with a flared opening, and then the second section is stretched into a circular flange opening. The circular flange opening of the third section abuts against the annular step and is welded and fixed to the explosion-proof flange. This process is faster and more convenient, more robust, improves quality, and reduces production costs.

[0018] 2. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box provided by this utility model has a horizontal mounting foot welded and fixed on one of its flat parts, thus forming a pendant light type junction box. In this way, the junction box can be fixed to the ceiling first by the horizontal mounting foot, and then the junction box cover can be opened for wiring, which is convenient to use.

[0019] 3. The tensile welded flange union type compression sealing explosion-proof and waterproof junction box provided by this utility model includes a first union body, a union nut, and a first compression nut. One end of the first union body is welded to a flat part, and the other end is provided with a first step. A first sealing ring is installed inside the first union body. The union nut has a second step and a first internal thread section, with the second step corresponding to and abutting against the first step. The first compression nut has a first external thread section threaded to the first internal thread section, and a crimping section extending into the first union body and abutting against the first sealing ring. The first compression nut is provided with an internal thread. When using steel pipe wiring, the first compression nut is first installed at one end of the steel pipe, and then the union nut is tightened to the first compression nut. In this way, the first compression nut, steel pipe, and first sealing ring will not rotate, making installation easier and eliminating the need for a PTFE bushing compression gasket.

[0020] 4. The tension-body welded flange union-type compression-sealed explosion-proof and waterproof junction box provided by this utility model includes a second junction body, a second compression nut, and a PTFE bushing compression gasket. The compression gasket, made of metal, ensures hardness, and the bushing body positions the metal gasket, preventing its outer wall from contacting the compression nut or the inner wall of the junction body. The L-shaped bushing is made of PTFE, resulting in low friction and torque between the PTFE L-shaped bushing and the second compression nut, making tightening the compression nut easier and ensuring that the sealing ring and cable do not rotate with the compression nut. This achieves convenient and labor-saving one-time installation, good sealing performance, and meets dustproof, waterproof, and explosion-proof standards. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the assembly of the explosion-proof flange of the stop type and the junction box tension body of this utility model.

[0023] Figure 2It is a tension body for a threaded explosion-proof flange and junction box;

[0024] Figure 3 For steel conduit wiring, explosion-proof union boxes with 2, 3, and 4-way connection performance are used for sealing.

[0025] Figure 4 A pendant-style junction box with explosion-proof joint performance for steel conduit wiring;

[0026] Figure 5 Explosion-proof two-, three-, and four-way junction boxes for cable wiring;

[0027] Figure 6 This is a structural schematic diagram of a cable wiring connector assembly;

[0028] Figure 7 A schematic diagram of the structure of a PTFE bushing compression gasket;

[0029] Figure 8 Explosion-proof pendant light junction box with cable wiring stop;

[0030] Figure 9 A four-way junction box with explosion-proof joint performance for steel conduit wiring;

[0031] Figure 10 Explosion-proof four-way junction box for cable wiring;

[0032] Figure 11 For steel conduit wiring, an explosion-proof, live-joint tee-type junction box with pendant light-style connector;

[0033] Figure 12 Explosion-proof tee-type pendant light junction box for cable wiring;

[0034] Figure 13 Explosion-proof, flexible, two-, three-, and four-way junction boxes with threaded connections for steel conduit wiring;

[0035] Figure 14 A pendant-style junction box with explosion-proof threaded joints for steel conduit wiring;

[0036] Figure 15 Explosion-proof two-, three-, and four-way junction boxes with screw-in connectors for cable wiring;

[0037] Figure 16 Explosion-proof pendant light junction box with screw-in connector for cable wiring;

[0038] Figure 17 For steel conduit wiring, a two-, three-, or four-way junction box with enhanced safety features and improved connection performance is provided.

[0039] Figure 18 A pendant-style junction box with enhanced safety features for steel conduit wiring;

[0040] Figure 19For cable wiring, the two-way, three-way, and four-way junction boxes are designed for increased safety.

[0041] Figure 20 A chandelier-style junction box for increased safety of cable wiring;

[0042] Figure 21 For steel conduit wiring, the screw-type union box with increased safety performance for two, three, and four-way connections is designed for bolt connections.

[0043] Figure 22 A pendant-style junction box with enhanced safety features for steel conduit wiring using threaded connections;

[0044] Figure 23 For cable wiring, screw-type two-way, three-way, and four-way junction boxes are provided for increased safety.

[0045] Figure 24 A screw-type pendant light junction box for increased safety of cable wiring;

[0046] Figure 25 A four-way junction box with increased safety performance for steel conduit wiring using threaded connections;

[0047] Figure 26 Increased safety four-way junction box for cable wiring with screw-in joints;

[0048] Figure 27 A T-junction box with enhanced safety features for steel conduit wiring, designed for threaded connections and pendant lamp style.

[0049] Figure 28 A screw-type three-way pendant light junction box for cable wiring with increased safety.

[0050] Explanation of reference numerals in the attached drawings: 1. Junction box base; 2. Junction box cover; 3. Explosion-proof flange; 4. Annular step; 5. Junction box tension body; 6. First section; 7. Second section; 8. Third section; 9. Flat part; 10. Arc-shaped part; 11. Connector body assembly; 12. Horizontal mounting foot; 13. Grounding bracket; 14. External grounding screw; 15. Internal grounding nut; 16. First connector body; 17. First step; 18. First sealing ring; 19. Union nut; 20. First clamping nut; 21. First internal thread 21. Threaded section; 22. Second step; 23. First external threaded section; 24. Crimping section; 25. Second connector body; 26. Second internal threaded section; 27. Second sealing ring; 28. Second clamping nut; 29. ​​Second external threaded section; 30. Clamping gasket; 31. Metal gasket; 32. L-shaped bushing; 33. Third step; 34. Fourth step; 35. Gasket body; 36. Bushing body; 37. Flange; 38. Vertical mounting foot; 39. Tightening groove seat; 40. Cover plate; 41. Connecting sleeve. Detailed Implementation

[0051] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0052] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0055] Example

[0056] This embodiment provides a tensile body welded flange union type compression sealing explosion-proof and waterproof junction box, such as... Figure 2 and Figure 4 As shown, it includes a junction box base 1 and a junction box cover 2. The junction box base 1 includes an explosion-proof flange 3 and a junction box tension body 5.

[0057] like Figure 1 and Figure 2 As shown, the explosion-proof flange 3 has an annular step 4 at its bottom.

[0058] like Figure 1 and Figure 2As shown, the junction box stretching body 5 has a first section 6, a second section 7, and a third section 8 connected sequentially from bottom to top and formed by stretching. The outer wall of the first section 6 has at least one flat portion 9, on which a connector assembly 11 is welded and fixed. The second section 7 is flared, and the third section 8 is a circular flange. The circular flange of the third section 8 abuts against the annular step 4 and is welded and fixed to the explosion-proof flange 3 (first weld point A1). During stretching, the flat portion 9 of the first section 6 is first stretched into the flared second section 7, and then the second section 7 is stretched into the circular flange of the third section 8. The circular flange of the third section 8 abuts against the annular step 4 and is welded and fixed to the explosion-proof flange 3. This process is faster and more convenient, reducing production costs. Furthermore, as... Figure 9 and Figure 10 As shown, the outer wall of the first segment 6 has multiple staggered planar portions 9 and arc-shaped portions 10. A grounding bracket 13 is welded onto one of the arc-shaped portions 10. An external grounding screw 14 and a grounding mark are installed on the grounding bracket 13. An internal grounding nut 15 is welded to the bottom of the junction box base 1, and a grounding mark is installed thereon. A wiring terminal is installed inside the junction box base 1. In this embodiment, the material of the junction box extension body 5 is stainless steel 304 or carbon steel Q235.

[0059] In this embodiment, the outer wall of the first segment 6 has four flat parts 9 and four arc-shaped parts 10. Each flat part 9 is provided with a connector assembly 11. It should be noted that the number of flat parts 9 can be 2, 3, 4 or more, thereby forming a two-way, three-way or four-way junction box. For those skilled in the art, it can be flexibly set according to actual needs.

[0060] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 8 , Figure 17 , Figure 18 , Figure 19 and Figure 20 As shown, the explosion-proof flange 3 is a stop-gauge type explosion-proof flange, and the junction box cover 2 is a stop-gauge type junction box cover. The stop-gauge type junction box cover and the stop-gauge type explosion-proof flange are fixed with bolts; as an alternative implementation, such as Figure 2 , Figure 13 , Figure 14 ,like Figure 15 , Figure 16 , Figure 21 , Figure 22 , Figure 23 and Figure 24As shown, the explosion-proof flange 3 is a threaded explosion-proof flange, and the junction box cover 2 is a threaded junction box cover. The threaded junction box cover is fixed to the threaded explosion-proof flange by threads. The top of the threaded junction box cover is provided with a tightening slot 39. During assembly, the tool is inserted into the tightening slot 39 to tighten the threaded junction box cover.

[0061] As a possible implementation, the junction box cover 2 is provided with the connector body assembly 11.

[0062] In this embodiment, as Figure 11 , Figure 12 , Figure 27 and Figure 28 As shown, a horizontal mounting foot 12 is welded and fixed to one of the flat parts 9 to form a chandelier-style junction box. This allows the junction box to be fixed to the ceiling first by the horizontal mounting foot 12, and then the junction box cover 2 can be opened for wiring, making it convenient to use.

[0063] As a variable implementation method, such as Figure 9 , Figure 10 , Figure 25 and Figure 26 As shown, a vertical mounting foot 38 is welded and fixed to one of the curved surfaces 10.

[0064] like Figure 3 As shown, the connector assembly 11 includes: a first connector body 16, one end of which is welded to the flat portion 9 (first weld point A2), and the other end has a first step 17. A first sealing ring 18 is installed inside the first connector body 16; a union nut 19, having a second step 22 and a first internal thread section 21, the second step 22 corresponding to and abutting against the first step 17; and a first clamping nut 20, having a first external thread section 23 threadedly connected to the first internal thread section 21, and a crimping section 24 extending into the first connector body 16 and abutting against the first sealing ring 18. The first clamping nut 20 has an internal thread. When using steel pipe for wiring, firstly install the first clamping nut 20 at one end of the steel pipe, and then tighten the union nut 19 to the first clamping nut 20. In this way, the first clamping nut 20, the steel pipe, and the first sealing ring 18 will not rotate, making installation easier and eliminating the need for a PTFE bushing clamping gasket. Figures 3-6 , Figure 8-16 As shown, the junction box is explosion-proof, the first sealing ring 18 is a conical sealing ring, and the inner wall of the first connector body 16 is formed with a conical surface that matches and abuts the conical sealing ring; as Figures 17-28 As shown, the junction box is of the increased safety type, and the first sealing ring 18 is a horn-shaped sealing ring.

[0065] As a variable implementation method, such as Figure 5 and Figure 6As shown, the connector assembly 11 includes: a second connector body 25 having a second internal thread section 26, and a second sealing ring 27 installed inside the second connector body 25. The second sealing ring 27 is a conical sealing ring or a horn-shaped sealing ring. When the second sealing ring 27 is a conical sealing ring, the inner wall of the second connector body 25 is formed with a conical surface that is adapted to and abuts against the conical sealing ring; a second clamping nut 28 having a second external thread section 29 connected to the second internal thread section 26; as Figure 6 and Figure 7 As shown, a PTFE bushing compression gasket 30 is disposed between the second sealing ring 27 and the second external thread section 29. It includes a metal gasket 31 and an L-shaped bushing 32. The metal gasket 31 includes a gasket body 35 and a third step 33 and a fourth step 34 respectively disposed at both ends of the outer wall of the gasket body 35. The L-shaped bushing 32 has a bushing body 36 that is compressed and sleeved on the outer wall of the gasket body 35, and a flange 37 disposed at one end of the bushing body 36. The third step 33 abuts against the second sealing ring 27, and the fourth step 34 abuts against the end of the bushing body 36 away from the flange 37. The two sides of the flange 37 abut against the third step 33 and the second external thread section 29 respectively. The aforementioned clamping gasket ensures hardness due to the use of metal gasket 31. Furthermore, the bushing body 36 positions the metal gasket 31, preventing its outer wall from contacting the inner wall of the second clamping nut or connector body. The L-shaped bushing 32 is made of PTFE, resulting in low friction and torque between it and the second clamping nut. This makes tightening the clamping nut easier and prevents the sealing ring and cable from rotating with the clamping nut. This achieves convenient and labor-saving one-time installation, excellent sealing performance, and meets dustproof, waterproof, and explosion-proof standards.

[0066] like Figure 3 As shown, the junction box cover 2 includes a cover plate 40 and a connecting sleeve 41 (third welding point A3) that is welded and fixed to the cover plate 40. The connecting sleeve 41 is a stop sleeve or a threaded sleeve.

[0067] This utility model provides a tension-body welded flange union-type compression-sealed explosion-proof and waterproof junction box. The junction box base includes an explosion-proof flange 3 and a junction box tension body 5. The explosion-proof flange 3 has an annular step 4 at its bottom. The junction box tension body 5 has a first section 6, a second section 7, and a third section 8 connected sequentially from bottom to top and formed by tension. The outer wall of the first section 6 has at least one flat portion 9, which is more conducive to welding and fixing the connector assembly 11. During tensioning, the flat portion 9 of the first section 6 is first stretched into a second section 7 with a flared opening, and then the second section 7 is stretched into a third section 8 with a circular flange opening. The circular flange opening of the third section 8 abuts against the annular step 4 and is welded and fixed to the explosion-proof flange 3. This process is faster and more convenient, more robust, improves quality, and reduces production costs.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A tensile welded flange type compression sealing explosion-proof and waterproof junction box, comprising a junction box base (1) and a junction box cover (2), characterized in that, The junction box (1) includes: Explosion-proof flange (3) having an annular step (4) at its bottom; The junction box stretching body (5) has a first section (6), a second section (7) and a third section (8) connected from bottom to top and formed by stretching. The outer wall of the first section (6) has at least one flat part (9), on which a connector body assembly (11) is welded and fixed. The second section (7) is flared, and the third section (8) is a circular flange. The circular flange of the third section (8) abuts against the annular step (4) and is welded and fixed to the explosion-proof flange (3).

2. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 1, characterized in that, The outer wall of the first segment (6) has a plurality of staggered planar portions (9) and arcuate portions (10).

3. The tensile welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 1 or 2, characterized in that, The explosion-proof flange (3) is a stop-type explosion-proof flange or a threaded type explosion-proof flange, and the junction box cover (2) is a stop-type junction box cover or a threaded type junction box cover.

4. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 1, characterized in that, A horizontal mounting foot (12) is welded and fixed to one of the flat parts (9).

5. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 2, characterized in that, The junction box cover (2) is provided with the connector body assembly (11), and a vertical mounting foot (38) is welded and fixed on one of the arc-shaped surfaces (10).

6. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 2, characterized in that, A grounding frame (13) is welded onto the arc-shaped surface (10). An external grounding screw (14) and a grounding mark are installed on the grounding frame (13). An internal grounding nut (15) is welded to the bottom of the junction box seat (1), and a grounding mark is installed thereon.

7. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 1 or 5, characterized in that, The connector body assembly (11) includes: The first connector body (16) has one end welded to the flat part (9) and the other end provided with a first step (17). A first sealing ring (18) is installed inside the first connector body (16). The union nut (19) has a second step (22) and a first internal thread section (21), wherein the second step (22) corresponds to and abuts against the first step (17); The first clamping nut (20) has a first external thread section (23) that is threadedly connected to the first internal thread section (21), and a crimping section (24) that extends into the first connector body (16) and abuts against the first sealing ring (18). The first clamping nut (20) is provided with an internal thread.

8. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 7, characterized in that, The first sealing ring (18) is a conical sealing ring or a horn-shaped sealing ring.

9. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 1 or 5, characterized in that, The connector body assembly (11) includes: The second connector body (25) has a second internal thread section (26), and a second sealing ring (27) is installed inside the second connector body (25); The second clamping nut (28) has a second external thread section (29) connected to the second internal thread section (26); A PTFE bushing compression gasket (30) is disposed between the second sealing ring (27) and the second external thread section (29). It includes a metal gasket (31) and an L-shaped bushing (32). The metal gasket (31) includes a gasket body (35) and a third step (33) and a fourth step (34) respectively disposed at both ends of the outer wall of the gasket body (35). The L-shaped bushing (32) has a bushing body (36) that is pressed and sleeved on the outer wall of the gasket body (35) and a flange (37) disposed at one end of the bushing body (36). The third step (33) abuts against the second sealing ring (27), and the fourth step (34) abuts against the end of the bushing body (36) away from the flange (37). The two sides of the flange (37) abut against the third step (33) and the second external thread section (29) respectively.

10. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 9, characterized in that, The second sealing ring (27) is a conical sealing ring or a horn-shaped sealing ring.

11. The tensile body welded flange union type compression sealing explosion-proof and waterproof junction box according to claim 1, characterized in that, The junction box cover (2) includes a cover plate (40) and a connecting sleeve (41) welded and fixed to the cover plate (40). The connecting sleeve (41) is a stop sleeve or a threaded sleeve.

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