Cable inlet waterproof sealing structure of explosion-proof control box

Abstract

The utility model provides a cable inlet wire waterproof sealing structure of an explosion-proof control box, which comprises an encapsulation cavity arranged at the bottom of the explosion-proof control box and communicated with the internal space of the explosion-proof control box, the encapsulation cavity is provided with a plurality of inlet wire joints arranged at intervals, the inlet wire joints are connected with clamping joints, and the clamping joints are connected with the explosion-proof control box. The wire inlet connector is matched with the clamping connector to be used for sealing a cable entering the anti-explosion control box, and after the cable is led into the anti-explosion control box, an encapsulation compound is injected into the encapsulation cavity from the opening in the front face of the anti-explosion control box. Aiming at the problems existing in the prior art, the cable inlet wire waterproof sealing structure of the explosion-proof control box is high in sealing grade, and the explosion-proof control box can work after being soaked in water for a long time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of electrical equipment, specifically relates to a cable incoming line waterproof sealing structure of explosion -proof control box. BACKGROUND

[0002] The explosion -proof control box is a kind of equipment for controlling electrical equipment such as motor, and is usually used in dangerous environment such as petrochemical, chemical industry, mine etc. Because these environments exist the risk of explosion and fire, therefore, the explosion -proof control box needs to have protective performance. Among them, the measure that prevents moisture from entering the explosion -proof control box is very important to ensure that it can still be safe and stable in operation in the harsh environment such as damp or dusty.

[0003] The existing explosion -proof control box is generally divided into single explosion -proof equipment and combined explosion -proof equipment, and the sealing of the external cable inlet of single explosion -proof equipment or combined explosion -proof equipment is relied on the clamping joint that is tightened, so that the rubber ring in the clamping joint is tightly wrapped on the cable outer skin, to achieve the sealing effect, but the rubber ring in the clamping joint is in compression state for a long time, and with the extension of time, the rubber ring gradually ages, and the elasticity decreases, and there is generally a situation of not tight sealing, and water is easily penetrated from the cable sealing place to the inside of the explosion -proof control box in the case of rain or in the case of immersion work, causing the electrical components to be disconnected. UTILITY MODEL CONTENTS

[0004] In view of the problems existing in the prior art, the utility model provides a cable incoming line waterproof sealing structure of explosion -proof control box, which has high sealing level, and the explosion -proof control box can work for a long time in water.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A cable incoming line waterproof sealing structure of explosion -proof control box, which includes a pouring cavity arranged at the bottom of the explosion -proof control box and communicating with the internal space of the explosion -proof control box, the pouring cavity is provided with a plurality of spaced apart incoming joints, the incoming joint is connected with the clamping joint, and the incoming joint and the clamping joint are used for sealing the cable entering the explosion -proof control box, after the cable is introduced into the explosion -proof control box, pouring compound is injected into the pouring cavity from the front opening of the explosion -proof control box.

[0007] Further, the bottom of the explosion -proof control box is provided with an opening for communicating with the pouring cavity, and the material of the explosion -proof control box can be aluminum alloy or carbon steel or stainless steel.

[0008] Further, the pouring cavity is a cuboid structure formed by four side plates and a bottom plate, the top edges of the four side plates are connected with the box plate of the explosion-proof control box, for example, vertical welding connection, preferably, the top edges of the four side plates are connected with the peripheral edge of the opening, the bottom plate is rectangular, the four edges of the bottom plate are connected with the bottom edges of the four side plates respectively, the bottom plate is provided with a through hole connected with the wire inlet connector, the materials of the side plates and the bottom plate are consistent with the material of the explosion-proof control box.

[0009] Alternatively, the pouring cavity is a cylindrical structure formed by one side plate and one bottom plate, the side plate is a cylindrical body, the top edge of the side plate is connected with the box plate of the explosion-proof control box, preferably, the top edge of the side plate is connected with the peripheral edge of the opening, the side plate and the box plate of the explosion-proof control box can be connected by welding, for example, the bottom plate is circular, the edge of the bottom plate is connected with the bottom edge of the side plate, the bottom plate is provided with a through hole connected with the wire inlet connector, the materials of the side plate and the bottom plate are consistent with the material of the explosion-proof control box.

[0010] Further, the pouring cavity is integrally formed with the explosion-proof control box.

[0011] Further, the gap between the wire inlet connector and the clamping connector is filled with viscoelastic adhesive, the viscoelastic adhesive fully penetrates the contacted metal surface, the viscoelastic adhesive can adopt the viscoelastic corrosion-resistant paste commonly used in the art, which is a never-solidified high polymer material, the viscoelastic adhesive is injected from the front opening of the explosion-proof control box, and a cover plate is covered on the front opening, when wiring or maintenance work is performed on the explosion-proof control box, the cover plate is first opened, and then the cover plate is covered after the wiring or maintenance is completed.

[0012] Further, the wire inlet connector is a short pipe extending to the outside of the pouring cavity and provided with a thread on the inner wall, and the wire inlet connector is coaxially connected with the through hole.

[0013] Further, the clamping connector includes a connector body threadedly connected with the wire inlet connector, a plurality of clamping strips provided at the end of the connector body away from the wire inlet connector, a clamping sealing ring connected with the inside of the clamping strips, a boss provided around the outer surface of the connector body, and a sealing nut detachably connected with the connector body.

[0014] Further, the connector body is a tubular body, the connector body is provided with an external thread, a portion of the connector body is threadedly connected with the wire inlet connector, and the length of the connector body connected with the wire inlet connector accounts for 1 / 4-1 / 3 of the length of the connector body, for example.

[0015] Further, the clamping strips are connected to the end face of the connector body, the length direction of the clamping strips is consistent with the axial direction of the connector body, the thickness of the clamping strips is less than the wall thickness of the connector body, a plurality of clamping strips are arranged around the clamping sealing ring, and a step for fixing the clamping sealing ring is formed between the clamping strips and the connector body.

[0016] Further, the clamping sealing ring is a rubber body with a certain thickness, the outer surface of the clamping sealing ring is tightly attached to the inner surface of the clamping strip, and the inner ring diameter of the clamping sealing ring is preferably slightly larger than the outer diameter of the cable, for example, 3-5 mm larger.

[0017] Further, the joint body on one side of the boss is connected with the wire inlet joint, and the joint body on the other side of the boss is connected with the sealing nut.

[0018] Further, the sealing nut comprises a threaded portion connected with the joint body in a threaded manner and a tapered portion connected to one end of the threaded portion, the tapered portion gradually reduces in size away from the joint body, the reduced end of the tapered portion is provided with a wire inlet port for the cable to enter the sealing nut and the joint body, the cable enters the sealing nut and the joint body from the wire inlet port and then passes through the clamping sealing ring to enter the explosion-proof control box, the sealing nut is rotated towards the joint body, the free end of the clamping strip gradually enters the tapered portion, the tapered portion presses the clamping strip, and the clamping strip causes the clamping sealing ring to deform to seal the cable.

[0019] A use method of a cable wire inlet waterproof sealing structure of an explosion-proof control box:

[0020] The cable passes through the clamping joint, the wire inlet joint, the pouring cavity and the explosion-proof control box from bottom to top, the sealing nut is rotated, the clamping sealing ring forms the first sealing for the cable, then the viscoelastic body glue is filled into the gap between the wire inlet joint and the clamping joint, with the extension of time, the viscoelastic body glue fully penetrates the contacted metal surface to form the second sealing for the connection between the clamping joint and the wire inlet joint, finally, the pouring compound is injected into the pouring cavity, the pouring cavity is completely closed after the pouring compound is solidified to form the third sealing, the electrical elements in the explosion-proof box are isolated from the outside, with the extension of use time (usually 1-2 years), the clamping sealing ring in the clamping joint gradually deforms, when the explosion-proof control box is in a water immersion working condition, the viscoelastic body glue filled into the gap between the wire inlet joint and the clamping joint and the pouring compound filled into the pouring cavity can completely prevent water from continuing to enter, thereby protecting the electrical elements in the explosion-proof control box.

[0021] The utility model discloses the following beneficial effects:

[0022] The utility model provides a kind of cable incoming line waterproof sealing structure of explosion-proof control box, by being set in the pouring cavity of explosion-proof control box bottom, and pouring compound is injected into pouring cavity, pouring compound solidifies after making whole pouring cavity completely closed, the connection of explosion-proof control box and cable is sealed, prevents water from invading explosion-proof control box body, and the electrical components in explosion-proof control box body are protected;Viscous-elastic body glue is filled between incoming line connector and clamping connector gap, and viscous-elastic body glue and the metal surface contacted are fully penetrated, the connection of clamping connector and incoming line connector is sealed, and the sealing property of the connection of explosion-proof control box and cable is enhanced;The connection of clamping connector and incoming line connector is set, and the connection is primarily sealed.The utility model provides a kind of cable incoming line waterproof sealing structure of explosion-proof control box, sets three seals, and structure is simple, economical and practical, prolongs the service life of explosion-proof control box, saves cost. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the front view of explosion-proof control box.

[0024] Figure 2 It is the side view of explosion-proof control box.

[0025] Figure 3 It is the three-dimensional schematic view of pouring cavity.

[0026] Figure 4 It is the cross-sectional view of pouring cavity.

[0027] Figure 5 It is the connection schematic view of incoming line connector and clamping connector.

[0028] Figure 6 It is the overall structure schematic view of clamping connector.

[0029] Figure 7 It is the longitudinal cross-sectional view of clamping connector.

[0030] REFERENCE SIGNS:

[0031] 1-explosion-proof control box, 2-pouring cavity, 201-side plate, 202-bottom plate, 203-through hole, 3-clamping connector, 301-connector main body, 302-clamping strip, 303-clamping sealing ring, 304-convex table, 305-sealing nut, 3051-threaded portion, 3052-tapered portion, 3053-incoming line port, 4-incoming line connector, 5-cover plate. DETAILED DESCRIPTION

[0032] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0033] As Figures 1-7As shown, the utility model provides a kind of cable incoming line waterproof sealing structure of explosion-proof control box, it includes the pouring cavity 2 being arranged at the bottom of explosion-proof control box 1 and with the internal space of explosion-proof control box 1 communication, pouring cavity 2 is equipped with multiple interval arrangement incoming line connector 4, incoming line connector 4 is connected with clamping connector 3, incoming line connector 4 is matched with clamping connector 3 for sealing the cable entering explosion-proof control box 1, after cable is introduced into explosion-proof control box 1, pouring cavity 2 is injected with pouring compound from the front opening of explosion-proof control box 1.

[0034] The bottom of explosion-proof control box 1 is provided with an opening for communication with the pouring cavity 2, and the material of the explosion-proof control box 1 can be, for example, aluminum alloy or carbon steel or stainless steel.

[0035] The pouring cavity 2 is a cuboid structure formed by four side plates 201 and a bottom plate 202, the top edges of the four side plates 201 are connected with the tank plates of the explosion-proof control box 1, for example, vertical welding connection, preferably, the top edges of the four side plates 201 are connected with the periphery of the opening, the bottom plate 202 is rectangular, the four edges of the bottom plate 202 are respectively connected with the bottom edges of the four side plates 201, the bottom plate 202 is provided with a through hole 203 connected with the incoming line connector 4, and the materials of the side plates 201 and the bottom plate 202 are consistent with the material of the explosion-proof control box 1.

[0036] In another embodiment, the pouring cavity is a cylindrical structure formed by a side plate and a bottom plate, the side plate is a cylindrical body, the top edge of the side plate is connected with the tank plate of the explosion-proof control box, preferably, the top edge of the side plate is connected with the periphery of the opening, the side plate and the tank plate of the explosion-proof control box can be connected by welding, the bottom plate is circular, the edge of the bottom plate is connected with the bottom edge of the side plate, the bottom plate is provided with a through hole connected with the incoming line connector, and the materials of the side plate and the bottom plate are consistent with the material of the explosion-proof control box.

[0037] The pouring cavity 2 is integrally formed with the explosion-proof control box 1.

[0038] The gap between the incoming line connector 4 and the clamping connector 3 is filled with viscoelastic glue, the viscoelastic glue fully penetrates the contacted metal surface, the viscoelastic glue is a never-solidified high polymer material commonly used in the art, the viscoelastic glue is injected from the front opening of the explosion-proof control box, and a cover plate 5 is covered on the front opening, when wiring or maintenance operation is performed on the explosion-proof control box, the cover plate 5 is first opened, and then the cover plate 5 is covered after wiring or maintenance is completed.

[0039] The incoming line connector 4 is a short pipe extending to the outside of the pouring cavity 2 and provided with threads on the inner wall, and the incoming line connector 4 is coaxially connected with the through hole 203.

[0040] The clamping joint 3 comprises a joint body 301 threadedly connected with the incoming line joint 4, a plurality of clamping strips 302 provided at one end of the joint body 301 away from the incoming line joint 4, a clamping sealing ring 303 connected with the joint body 301 at the inner side of the clamping strips 302, a boss 304 provided around the outer surface of the joint body 301, and a sealing nut 305 detachably connected with the joint body 301.

[0041] The joint body 301 is a tubular body, and is provided with external threads. A portion of the joint body 301 is threadedly connected with the incoming line joint 4, and the length of the joint body 301 connected with the incoming line joint 4 accounts for, for example, 1 / 4-1 / 3 of the length of the joint body 301.

[0042] The clamping strips 302 are connected to the end face of the joint body 301, and the length direction of the clamping strips 302 is consistent with the axial direction of the joint body 301. The thickness of the clamping strips 302 is smaller than the wall thickness of the joint body 301. The plurality of clamping strips 302 are arranged around the clamping sealing ring 303, and a step for fixing the clamping sealing ring 303 is formed between the clamping strips 302 and the joint body 301.

[0043] The clamping sealing ring 303 is a rubber body with a certain thickness. The outer surface of the clamping sealing ring 303 is tightly attached to the inner surface of the clamping strips 302. The inner ring diameter of the clamping sealing ring 303 is preferably slightly larger than the outer diameter of the cable, for example, by 3-5 mm.

[0044] The joint body 301 on one side of the boss 304 is connected with the incoming line joint 4, and the joint body 301 on the other side of the boss 304 is connected with the sealing nut 305.

[0045] The sealing nut 305 comprises a threaded portion 3051 threadedly connected with the joint body 301, and a tapered portion 3052 connected to one end of the threaded portion 3051. The tapered portion 3052 gradually decreases in size away from the joint body 301. The tapered portion 3052 is provided with an incoming port 3053 at the end of the tapered portion 3052, through which the cable enters the sealing nut 305 and the joint body 301. The cable enters the sealing nut 305 and the joint body 301 through the incoming port 3053, and then enters the explosion-proof control box 1 through the incoming line joint 4. When the sealing nut 305 is rotated towards the joint body 301, the free ends of the clamping strips 302 gradually enter the tapered portion 3052, the tapered portion 3052 presses the clamping strips 302, and the clamping strips 302 cause the clamping sealing ring 303 to deform, thereby sealing the cable.

[0046] A use method of a cable incoming line waterproof sealing structure of an explosion-proof control box:

[0047] The cable passes through the clamping joint 3, the inlet joint 4, the pouring cavity 2 to the inside of the explosion-proof control box 1 from bottom to top, the rotating sealing nut 305, the clamping sealing ring 303 form the first sealing to the cable, then fill the viscoelastic glue to the gap between the inlet joint 4 and the clamping joint 3, with the extension of time, the viscoelastic glue fully penetrates the contacted metal surface, forms the second sealing to the joint between the clamping joint 3 and the inlet joint 4, finally inject the pouring compound (the pouring compound may be epoxy resin for example) into the pouring cavity 2, the pouring compound solidifies to make the whole pouring cavity 2 completely closed, forms the third sealing, isolates the electrical components in the explosion-proof box from the outside, with the extension of the use time (usually 1-2 years), the clamping sealing ring 303 in the clamping joint 3 gradually ages and deforms, when the explosion-proof control box 1 is in the water immersion working condition, because the viscoelastic glue is filled to the gap between the inlet joint 4 and the clamping joint 3, the pouring compound is filled in the pouring cavity 2, water can be completely prevented from continuing to immerse, and the electrical components in the explosion-proof control box 1 are protected.

[0048] The preferred embodiments of the present application are described above, however, the above description is not used for the purpose of limitation. Those skilled in the art can make many changes or modifications to the present application without departing from the main idea and scope of the present application. The changes or modifications should be included in the scope of the appended claims.

Claims

1. A cable entry waterproof sealing structure of an explosion-proof control box, characterized by, The pouring cavity is formed by four side plates and a bottom plate, the top edges of the four side plates are connected with the box plates of the explosion-proof control box, the bottom plate is rectangular, the four edges of the bottom plate are connected with the bottom edges of the four side plates respectively, and the bottom plate is provided with through holes connected with the wire inlet joints.

2. The cable entry water seal for an explosion-proof control box of claim 1, wherein, The pouring cavity is formed by a side plate and a bottom plate, the side plate is a cylindrical body, the top edge of the side plate is connected with the box plate of the explosion-proof control box, the bottom plate is circular, the edge of the bottom plate is connected with the bottom edge of the side plate, and the bottom plate is provided with through holes connected with the wire inlet joints.

3. The cable entry water seal for an explosion-proof control box of claim 1, wherein, The pouring cavity is formed by a side plate and a bottom plate, the side plate is a cylindrical body, the top edge of the side plate is connected with the box plate of the explosion-proof control box, the bottom plate is circular, the edge of the bottom plate is connected with the bottom edge of the side plate, and the bottom plate is provided with through holes connected with the wire inlet joints.

4. The cable entry water seal for an explosion-proof control box of any one of claims 1-3, wherein, The pouring cavity is formed by a side plate and a bottom plate, the side plate is a cylindrical body, the top edge of the side plate is connected with the box plate of the explosion-proof control box, the bottom plate is circular, the edge of the bottom plate is connected with the bottom edge of the side plate, and the bottom plate is provided with through holes connected with the wire inlet joints.

5. The cable entry water seal for an explosion-proof control box of any one of claims 1-3, wherein, The gap between the wire inlet joint and the clamping joint is filled with viscoelastic glue.

6. The cable entry water seal for an explosion-proof control box of claim 5, wherein, The wire inlet joint is a short pipe extending to the outside of the pouring cavity and provided with threads on the inner wall, and the wire inlet joint is coaxially connected with the through hole.

7. The cable entry water-proof seal for an explosion-proof control box of any one of claims 1-3, wherein, The clamping joint comprises a joint body threadedly connected with the wire inlet joint, a plurality of clamping strips provided on the end of the joint body away from the wire inlet joint, a clamping sealing ring connected with the inner side of the joint body and the clamping strips, a boss arranged around the outer surface of the joint body, and a sealing nut detachably connected with the joint body.

8. The cable entry water seal for an explosion-proof control box of claim 7, wherein, The joint body is a tubular body, the joint body is provided with external threads, and a part of the joint body is threadedly connected with the wire inlet joint.

9. The cable entry water seal for an explosion-proof control box of claim 8, wherein, The clamping strips are connected on the end face of the joint body, the length direction of the clamping strips is consistent with the axial direction of the joint body, the thickness of the clamping strips is smaller than the wall thickness of the joint body, a plurality of clamping strips are arranged around the clamping sealing ring, and the clamping strips and the joint body form a step for fixing the clamping sealing ring.

10. The cable entry water seal for an explosion-proof control box of claim 9, wherein, The sealing nut comprises a threaded part threadedly connected with the joint body and a tapered part connected with one end of the threaded part, the tapered part gradually reduces in the direction away from the joint body, and the reduced end of the tapered part is provided with a wire inlet opening for the cable to enter the sealing nut and the joint body.

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