Explosion-proof and corrosion-proof junction box

Abstract

The present invention discloses an explosion-proof and corrosion-resistant junction box, including a box body and a terminal block arranged therein; the box body includes a rectangular box frame, a front cover plate and a rear cover plate arranged on the front and rear frame openings of the rectangular box frame, and the upper horizontal plate and the lower horizontal plate of the rectangular box frame are respectively provided with hollow cylindrical upper wire entry posts and lower wire entry posts for the wires to pass through, and the rear cover plate, the upper wire entry posts and the lower wire entry posts are an integrated structure with the rectangular box frame; the upper horizontal plate is provided with an inspection portion for inspection, and the upper plate surface of the lower horizontal plate is provided with a fixing portion for fixing the wires. The present invention realizes the overall sealing of the junction box, so that the junction box of the present application has good sealing performance, especially suitable for Class C and above grade warehouses, achieving the purpose of explosion-proof and corrosion-resistant. An inspection port is provided between the two upper terminal posts, which is convenient for the inspection and maintenance of the junction box and increases the service life of the junction box. At the same time, the present invention has reasonable structural design, simple operation and strong practicality.

Description

Technical Field

[0001] The invention relates to an electrical auxiliary material junction box in the field of electrical appliances, in particular to an explosion-proof and corrosion-resistant junction box. Background Art

[0002] Traditional electrical wires consist of conductors and insulating sheaths. When laying wires, if the lines are long or need to turn corners, a junction box is often required for transition. That is, the insulating sheath is fixed to the junction box and the conductors are connected to the terminal blocks in the junction box to protect the wires and prevent people from electric shock.

[0003] For warehouses above Class C, toxic gases such as pesticides in the warehouses may corrode electrical circuits, especially copper; therefore, when laying wires in warehouses above Class C, when spraying insecticide gases, the junction boxes used must have anti-corrosion and explosion-proof functions to prevent corrosion by toxic gases. At present, the laying of wires in warehouses above Class C adopts the open laying method with ordinary junction boxes or commercially available explosion-proof junction boxes. Ordinary junction boxes are generally closed, especially in environments with corrosive gases or dust. Gases can easily invade the gaps in the junction boxes, resulting in reduced insulation of the wires or corrosion of the box body, which requires frequent maintenance, and in severe cases, the lines need to be replaced. Most of the explosion-proof junction boxes on the market have metal shells, which have limited tolerance to toxic gases. When they are in a toxic gas environment for a long time, the shell of the explosion-proof junction box is easily penetrated by gas and is not easy to inspect and maintain. Summary of the invention

[0004] The invention aims to provide an explosion-proof and corrosion-resistant junction box suitable for warehouses of Class C or above.

[0005] To achieve the above purpose, the present invention can adopt the following technical solutions:

[0006] The explosion-proof and corrosion-resistant junction box of the present invention comprises a box body and a wiring row arranged therein; the box body comprises a rectangular box frame, a front cover plate and a rear cover plate arranged on the front and rear frame openings of the rectangular box frame, and an upper horizontal plate and a lower horizontal plate of the rectangular box frame are respectively provided with a hollow cylindrical upper wire entry post and a lower wire entry post for the wires to pass through, and the rear cover plate, the upper wire entry post and the lower wire entry post are an integral structure with the rectangular box frame; an inspection portion for maintenance is arranged on the upper horizontal plate, and a fixing portion for fixing the wires is arranged on the upper plate surface of the lower horizontal plate.

[0007] Preferably, there are two upper inlet posts, which are arranged at intervals on the upper horizontal plate; the inspection part includes:

[0008] An inspection opening is provided on the upper horizontal plate between the two upper incoming wire columns, and the inspection opening is a stepped opening with a larger top and a smaller bottom;

[0009] A movable sealing plate matched with the step opening, the movable sealing plate is used to close or open the inspection opening;

[0010] A clamping mechanism is arranged on the upper surface of the movable sealing plate, and the clamping mechanism is used to press the movable sealing plate into the step opening.

[0011] Furthermore, the clamping mechanism includes: a pressing block horizontally slidably arranged on the movable sealing plate, and horizontal telescopic positioning mechanisms symmetrically arranged on the left and right sides of the pressing block with respect to the vertical midline of the pressing block, and the horizontal telescopic positioning mechanisms on the left and right sides have the same structure, including:

[0012] A push plate, a horizontal screw with one end fixedly connected to the push plate, the other end of the horizontal screw extending into the pressing block, and vertically screwed to a threaded knob vertically downwardly arranged on the pressing block, and the horizontal screw is driven to reciprocate left and right by rotating the threaded knob.

[0013] Preferably, the side surface of the push plate relative to the upper wire feeder column is an arc surface that is consistent with the curvature of the outer surface of the upper wire feeder column.

[0014] Preferably, the fixing part is a positioning mechanism arranged on the left and right sides of the lower wire feeder column, and the positioning mechanism on the left and right sides has the same structure, including a fixing block, and a pressure spring is fixed on the fixing block toward the side of the lower wire feeder column, and a top plate is arranged on the end of the pressure spring toward the lower wire feeder column, and the top plate is an arc-shaped plate consistent with the curvature of the outer surface of the lower wire feeder column.

[0015] Furthermore, the rear cover plate is provided with screw holes for fixing and disassembling the explosion-proof and corrosion-resistant junction box.

[0016] The advantages of the present invention are embodied in the following aspects:

[0017] 1. The rear cover plate, the upper incoming wire post, the lower incoming wire post and the rectangular box frame of the present invention are an integrated structure. When in use, asphalt anti-corrosion paint or vacuum sealant is poured between the insulating sheath of the wire and the upper and lower incoming wire posts to achieve the overall sealing of the junction box, so that the junction box of the present application has good sealing performance and achieves the purpose of explosion-proof and corrosion-proof.

[0018] 2. An inspection port is provided between the two upper terminals to facilitate the inspection and maintenance of the junction box and increase the service life of the junction box.

[0019] 3. The present invention has reasonable structural design, simple operation and strong practicality, and is especially suitable for use in Class C and above warehouses, as well as in application scenarios where pesticides and other drugs need to be sprayed frequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure in the use state of the present invention without hiding the front cover plate.

[0022] Figure 3 It is a structural schematic diagram of the clamping mechanism of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication will also change accordingly. Figure 1-3 As shown, the explosion-proof and corrosion-resistant junction box of the present invention comprises a box body and a wiring bank 1 arranged therein, the wiring bank 1 can be arranged in two or more rows, separated by an insulating strip 2; the box body comprises a rectangular box frame 3, a front cover plate 4 and a rear cover plate 5 arranged on the front and rear frame openings of the rectangular box frame 3, the upper horizontal plate and the lower horizontal plate of the rectangular box frame 3 are respectively provided with two hollow cylindrical upper inlet poles 7.1, 7.2 and a hollow cylindrical lower inlet pole 8 for the wire 6 to pass through, the rear cover plate 5, the upper inlet poles 7.1, 7.2, and the lower inlet pole 8 are an integral structure with the rectangular box frame 3; the rear cover plate 5 is provided with screw holes for fixing and disassembling the explosion-proof and corrosion-resistant junction box.

[0024] The outer surface of the box body is coated with a linear low-density polyethylene (LLDPE) outer layer, which makes the box body have excellent environmental stress cracking resistance and electrical insulation, as well as high heat resistance, impact resistance and puncture resistance.

[0025] An inspection part for maintenance is provided on the upper horizontal plate of the rectangular box frame 3, and the inspection part includes an inspection port opened between the two upper line-in columns 7.1 and 7.2. The inspection port is a stepped port which is larger at the top and smaller at the bottom. A sealing ring made of low-density polyethylene material is provided in the stepped port, and a movable sealing plate 9 matching the stepped port is snapped on the stepped port. The movable sealing plate 9 is used to close or open the inspection port, and the movable sealing plate 9 is made of low-density polyethylene material.

[0026] The upper surface of the movable sealing plate 9 is provided with a pressing mechanism for pressing the movable sealing plate 9 into the step opening; Figure 3 As shown, the clamping mechanism includes:

[0027] The pressing block 10 is horizontally slidably arranged on the movable sealing plate 9, and the horizontal telescopic positioning mechanism is symmetrically arranged on the left and right sides of the pressing block 10 with respect to the vertical center line 11 of the pressing block 10. The left and right horizontal telescopic positioning mechanisms have the same structure and include:

[0028] A horizontal screw rod 12 is provided with a push plate 13 fixed at one end of the horizontal screw rod 12, and the other end of the horizontal screw rod 12 extends into the pressing block 10 and is vertically screwed to a threaded knob 14 vertically downwardly arranged on the pressing block 10. The horizontal screw rod 12 is driven to reciprocate left and right by rotating the threaded knob 14. The structure is stable and reliable with strong operability. The side surface of the push plate 13 relative to the upper wire feed column is an arc surface consistent with the curvature of the outer surface of the upper wire feed column to increase the contact area with the upper wire feed column.

[0029] A fixing portion for fixing the wire 6 is provided on the upper surface of the lower horizontal plate of the rectangular box frame 3, which is used to fix the wire 6 entering the junction box, prevent the wire from swinging back and forth in the box body, reduce the swing of the wire on the terminal block 1, and ensure the stability of the connection of the wire 6.

[0030] like Figure 2 As shown, the fixing part is a positioning mechanism arranged on the left and right sides of the lower wire-inlet column 8. The positioning mechanisms on the left and right sides have the same structure, including a fixing block 15. The fixing block 15 is fixed with a pressure spring 16 on the side facing the lower wire-inlet column 8. The pressure spring 16 is provided with a top plate 17 at the end facing the lower wire-inlet column 8. The top plate 17 is an arc-shaped plate consistent with the curvature of the outer surface of the lower wire-inlet column 8 to increase the contact area with the wires 6 entering the box body.

[0031] In actual use, asphalt anticorrosive paint 18 or vacuum sealant is poured between the insulating sheath of the conductor 6 and the upper and lower inlet poles 7.1, 7.2, 8 to achieve the overall sealing of the junction box.

Claims

1. An explosion-proof and corrosion-resistant junction box, comprising a box body and a wiring block arranged therein; wherein: The box body comprises a rectangular box frame, a front cover plate and a rear cover plate arranged at the front and rear frame openings of the rectangular box frame, and the upper horizontal plate and the lower horizontal plate of the rectangular box frame are respectively provided with a hollow cylindrical upper wire entry post and a lower wire entry post for the wire to pass through, and the rear cover plate, the upper wire entry post and the lower wire entry post are an integral structure with the rectangular box frame; the upper horizontal plate is provided with an inspection part for inspection, and the upper plate surface of the lower horizontal plate is provided with a fixing part for fixing the wire; There are two upper inlet poles, which are arranged on the upper horizontal plate at intervals; the inspection part includes: An inspection opening is provided on the upper horizontal plate between the two upper incoming wire columns, and the inspection opening is a stepped opening with a larger top and a smaller bottom; A movable sealing plate matched with the step opening, the movable sealing plate is used to close or open the inspection opening; A pressing mechanism is arranged on the upper surface of the movable sealing plate, and the pressing mechanism is used to press the movable sealing plate into the step opening; The clamping mechanism comprises: a pressing block horizontally slidably arranged on the movable sealing plate, and horizontal telescopic positioning mechanisms symmetrically arranged on the left and right sides of the pressing block with respect to the vertical midline of the pressing block. The horizontal telescopic positioning mechanisms on the left and right sides have the same structure and include: A push plate, a horizontal screw rod fixedly connected to the push plate at one end, the other end of the horizontal screw rod extending into the pressing block and vertically screwed to a threaded knob vertically downwardly arranged on the pressing block, and the horizontal screw rod is driven to reciprocate left and right by rotating the threaded knob; The rear cover plate is provided with screw holes for fixing and disassembling the explosion-proof and corrosion-proof junction box.

2. The explosion-proof and corrosion-proof junction box according to claim 1, wherein: The side surface of the push plate relative to the upper wire-inlet column is an arc surface that is consistent with the curvature of the outer surface of the upper wire-inlet column.

3. The explosion-proof and corrosion-proof junction box according to claim 1 or 2, wherein: The fixing part is a positioning mechanism arranged on the left and right sides of the lower wire inlet column. The positioning mechanisms on the left and right sides have the same structure and include a fixing block. A pressure spring is fixed on the fixing block toward the side of the lower wire inlet column. A top plate is arranged on the end of the pressure spring toward the lower wire inlet column. The top plate is an arc-shaped plate consistent with the curvature of the outer surface of the lower wire inlet column.

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