CN214706995U - Explosion-proof intermediate junction box - Google Patents

Abstract

The utility model relates to a terminal box in middle of explosion-proof, including box body, lid, fixed connection can be dismantled with the lid to the box body, the box body is hollow four pyramid platform structure, be fixed with the connecting pipe on the both sides wall of box body respectively, the one end of connecting pipe extends to in the box body in order to communicate with the box body is inside, the hole of connecting pipe comprises the straight hole and the bell mouth of mutual intercommunication, the bell mouth is located the box body, connecting pipe outer wall threaded connection gland in the box body. Through set up the bell mouth in the connecting pipe to design complex sealing washer and gland, in gland and connecting pipe connection fixed in-process extrusion sealing washer and stretch into the bell mouth, produce radial power under the effect of bell mouth, so that the inner wall of sealing washer closely laminates the heat tracing cable, realize sealedly, avoid steam to get into the box body from the clearance between heat tracing cable and the connecting pipe, thereby avoid producing the emergence that the ignition leads to the explosion accident, the explosion-proof is good.

Description

Explosion-proof intermediate junction box

Technical Field

The utility model relates to a terminal box technical field, concretely relates to terminal box in middle of explosion-proof.

Background

The skin current heating method (skin current method or SECT method for short) is a new type of pipeline heating system in the middle of 60 years. The heating system has simple structure, safety, reliability, long service life, easy automation and high energy utilization rate, and is rapidly and gradually paid attention and researched at home and abroad. For oil field long-distance pipelines, port long-distance pipelines, chemical plant long-distance pipelines, natural gas long-distance pipelines and the like, in order to ensure that the surface temperature of the long-distance pipelines is required to be maintained when the medium in the pipelines exceeds the environmental temperature and is normally produced and flows, one or more skin effect electric heat tracing elements can be axially arranged between the surface of the long-distance pipelines and an insulating layer to play a role in heat tracing and heat compensation. The length of the skin effect electric heat tracing element is longer, and each skin effect electric heat tracing element is provided with an alternating current power supply at one end thereof and can be driven to reach about 20km at most. The principle is that a high-temperature electric wire is penetrated in a ferromagnetic steel pipe, a wire core at the tail end of the ferromagnetic steel pipe is connected with the tail end of the ferromagnetic steel pipe, the wire core and the wire core form a series circuit with a phase line and a zero line of an alternating current power supply respectively at the head end, and the alternating current direction is that the phase line of the alternating current power supply returns to the zero line of the power supply through the head end of the high-temperature electric wire, the tail end of the high-temperature electric wire, a connecting terminal at the tail end of the ferromagnetic steel pipe and the inner wall of the ferromagnetic steel pipe. The heating principle generates heat from three aspects: (1) joule heat is generated when alternating current flows on the high-temperature wire resistor; (2) joule heat generated by the resistance inside the ferromagnetic steel pipe; (3) joule heat is generated by the resistance of eddy current in its wall due to the magnetic flux induced electromotive force in the ferromagnetic steel pipe caused by the alternating current in the high-temperature electric wire, and the heat thereof against the magnetic domain friction.

In the prior art, the pipelines are very long, the heat tracing cables need to be spliced to increase the length, and two adjacent heat tracing cables are connected through the junction box, but the existing junction box is poor in sealing performance, water vapor easily enters the junction box, ignition is easily generated in the junction box, explosion accidents are easily caused, and the explosion resistance is poor.

SUMMERY OF THE UTILITY MODEL

For solving the problem that prior art exists, the utility model provides an explosion-proof middle junction box.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a terminal box in middle of explosion-proof, includes box body, lid, fixed connection can be dismantled with the lid to the box body, the box body is hollow four pyramid platform structure, be fixed with the connecting pipe on the both sides wall of box body respectively, the one end of connecting pipe extends to in the box body in order to communicate with the box body is inside, the hole of connecting pipe comprises the straight hole and the bell mouth of mutual intercommunication, the bell mouth is located the box body, connecting pipe outer wall threaded connection gland in the box body, set up the sealing washer between gland and the connecting pipe, the periphery wall of sealing washer be with bell mouth complex conical structure, heat tracing cable passes connecting pipe, sealing washer and gland and stretches into in the box body, the gland compresses tightly the sealing washer in the bell mouth on the connecting pipe, and the sealing washer makes the inner wall of sealing washer and the laminating of heat tracing cable in order to seal under the mutual extrusion of bell mouth.

Preferably, the top edge part fixed connection board of box body, the top of connecting plate is equipped with the recess, place sealed the pad in the recess, when lid and box body can be dismantled fixedly, compress tightly sealed pad in the recess so that box body internal seal.

In any of the above aspects, preferably, the width of the bottom of the box body is smaller than the width of the opening part of the box body.

In any of the above schemes, preferably, a hook is fixed on one side wall of the box cover parallel to the central line of the connecting pipe, the hook is in an L-shaped structure, and when the box cover is connected with the box body, the hook hooks the edge part of the connecting plate.

In any of the above schemes, preferably, the connecting plate outside the groove is provided with a plurality of threaded holes, the box cover is provided with mounting holes at positions corresponding to the threaded holes, and the mounting holes on the box cover are connected with the threaded holes through screws so as to be detachably fixed with the box body.

In any of the above schemes, preferably, when the hook on the box cover is hooked on the connecting plate, the mounting hole on the box cover is right corresponding to the threaded hole on the connecting plate.

In any of the above aspects, preferably, an edge of the cover is flush with an edge of the connecting plate.

Compared with the prior art, the utility model provides an explosion-proof middle junction box has following beneficial effect:

1. the connecting pipe is internally provided with the tapered hole, the sealing ring and the gland are matched, the sealing ring is extruded and extends into the tapered hole in the process that the gland is connected and fixed with the connecting pipe, radial force is generated under the action of the tapered hole, so that the inner wall of the sealing ring is tightly attached to the heat tracing cable, the sealing between the heat tracing cable and the connecting pipe is realized, water vapor is prevented from entering the box body from a gap between the heat tracing cable and the connecting pipe, the explosion accident caused by ignition is avoided, and the explosion-proof performance is good;

2. through setting up the couple on the lid, before lid and box body do not install the screw, hook the preliminary connection of connecting plate in order to realize box body and lid through the couple, the lid need not the staff and lifts this moment, and staff's both hands can break away from the lid completely, then directly take screw and instrument and fix lid and box body, make the installation of lid convenient and fast more.

Drawings

FIG. 1 is a schematic view of the overall structure of a cartridge;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a cross-sectional view of the heat trace cable connected to the connecting tube, the gland and the sealing ring;

FIG. 5 is a schematic view of the lid;

FIG. 6 is a left side view of FIG. 5;

fig. 7 is a schematic structural view of the connection of the hook and the connecting plate.

The figures are labeled as follows: 1. a box body; 2. a connecting plate; 3. a groove; 4. a connecting pipe; 5. a tapered hole; 6. a straight hole; 7. a heat tracing cable; 8. a gland; 9. a seal ring; 10. a box cover; 11. hooking; 12. a transverse bar; 13. a vertical rod.

Detailed Description

In order to further understand the inventive content of the present invention, the present invention will be explained in detail with reference to the specific embodiments.

As shown in fig. 1-7, an embodiment of an explosion-proof middle junction box according to the present invention comprises a box body 1 and a box cover 10, wherein the box body 1 and the box cover 10 are detachably and fixedly connected, the box body 1 is a hollow quadrangular frustum structure, two side walls of the box body 1 are respectively fixed with a connecting pipe 4, one end of the connecting pipe 4 extends into the box body 1 to communicate with the inside of the box body 1, an inner hole of the connecting pipe 4 is composed of a straight hole 6 and a tapered hole 5 which are communicated with each other, the tapered hole 5 is located in the box body 1, the outer wall of the connecting pipe 4 in the box body 1 is in threaded connection with a gland 8, a sealing ring 9 is arranged between the gland 8 and the connecting pipe 4, the peripheral wall of the sealing ring 9 is in a tapered structure matched with the tapered hole, a heat tracing cable 7 passes through the connecting pipe 4, the sealing ring 9 and the gland 8 to extend into the box body 1, the gland 8 compresses the sealing ring 9 in the tapered hole 5 on the connecting pipe 4, and the inner wall of the sealing ring 9 is attached to the heat tracing cable 7 for sealing under the mutual extrusion of the sealing ring 9 and the taper hole 5.

Gland 8 compresses tightly sealing washer 9 in bell mouth 5, the inner wall of bell mouth 5 and the laminating of the periphery wall of sealing washer 9, 8 when connecting pipe 4 central line direction extrusion sealing washer 9 is followed to gland, produce radial power to the sealing washer under the cooperation of bell mouth 5 and the 9 periphery walls of sealing washer, make the inner wall of sealing washer 9 and accompany the laminating of heat cable 7 closely, realize the sealing between heat cable 7 and the connecting pipe 4, avoid steam to get into box body 1 from the clearance between heat cable 7 and the connecting pipe 4, thereby avoid producing the emergence that leads to the explosion accident of striking sparks, explosion-proof nature is good.

Meanwhile, the gland 8 extrudes the sealing ring 9 to connect the heat tracing cable 7 with the connecting pipe 4, and the heat tracing cable 7 is not moved when being pulled, so that the connection between the heat tracing cables 7 in the box body 1 is not damaged, and the normal work of a line is ensured.

Further, the width of the bottom of the box body 1 is smaller than the width of the opening part of the box body 1.

The box body 1 is designed into a quadrangular frustum structure, so that the occupied space of the box body 1 on a conveying pipeline is reduced, and the installation is convenient.

The top edge part fixed connection board 2 of box body 1, the top of connecting plate 2 is equipped with recess 3, place sealed the pad in the recess 3, lid 10 can dismantle with box body 1 when fixed, compress tightly sealed pad in recess 3 so that 1 internal seal of box body.

Specifically, connecting plate 2 is the rectangle ring structure, sets up recess 3 on the connecting plate 2, makes sealing washer 9 place in recess 3, plays limiting displacement to sealing washer 9, makes sealing washer 9 remove and influence sealed effect when avoiding lid 10 to be connected with box body 1.

A hook 11 is fixed on a side wall of the box cover 10 parallel to the central line of the connecting pipe 4, the hook 11 is of an L-shaped structure, and when the box cover 10 is connected with the box body 1, the hook 11 hooks the edge part of the connecting plate 2.

Specifically, as shown in fig. 6 and 7, the hook 11 is composed of a transverse rod 12 and a vertical rod 13, the bottom of one end of the transverse rod 12 is fixed to one side wall of the box cover 10, the other end of the transverse rod 12 is fixed to the vertical rod 13, when the box cover 10 is connected to the box body 1, the transverse rod 12 is lapped on the top of the connecting plate 2, and the vertical rod 13 is located on the rear side of the connecting plate 2 to achieve the purpose of hooking the connecting plate 2, so that the box cover 10 is initially connected to the box body 1 and cannot be separated from the box body.

Be equipped with a plurality of screw holes on the connecting plate 2 in the recess 3 outside, the position that corresponds with the screw hole on the lid 10 is equipped with the mounting hole, mounting hole on the lid 10 passes through bolted connection with the screw hole and can dismantle fixedly with box body 1.

When the hook 11 on the box cover 10 is hooked on the connecting plate 2, the mounting hole on the box cover 10 is right corresponding to the threaded hole on the connecting plate 2.

The edge of the box cover 10 is flush with the edge of the connecting plate 2.

The box body 1 shown in figure 1 is put in a form, when the box cover 10 is connected with the box body 1, the hook 11 on the box cover 10 is firstly hooked on the edge part of the top of the connecting plate 2, the initial connection between the box cover 10 and the box body 1 is realized, the box cover 10 does not need to be lifted by a worker at the moment, the two hands of the worker can be completely separated from the box cover 10, then the screw and the tool which are directly taken are used for fixing the box cover 10 and the box body 1, and the installation of the box cover 10 is more convenient and rapid.

The working principle of the embodiment is as follows: during installation, the box body 1 is fixed with a conveying pipeline, then the heat tracing cable 7 penetrates through the connecting pipe 4 and extends into the box body 1, the sealing ring 9 is sleeved on the heat tracing cable 7, the pressing cover 8 is connected with the connecting pipe 4 in a threaded mode, the pressing cover 8 presses the sealing ring 9, one end of the sealing ring 9 is pressed into the tapered hole 5, radial force is generated on the sealing ring 9 under the action of the tapered hole 5, the inner wall of the sealing ring 9 is tightly attached to the heat tracing cable 7, sealing connection is achieved, after the heat tracing cable 7 is fixed, the sealing gasket is placed in the groove 3, the box cover 10 is installed, the hook 11 hooks the top of the connecting plate 2, at the moment, the box cover 10 cannot be separated from the box body 1, the box cover 10 and the box body 1 are fixed through screws, the sealing gasket is pressed, and sealing of the box cover 10 and the box body 1 is guaranteed.

It will be understood by those skilled in the art that any combination of the elements of the present invention, including the summary and detailed description of the invention provided in the foregoing description and illustrated in the accompanying drawings, is not to be considered limiting in scope and in order to make the description more concise, and not to describe every element of the combination. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. An explosion-proof intermediate junction box, its characterized in that: including box body, lid, fixed connection can be dismantled with the lid to the box body, the box body is hollow four pyramid platform structure, be fixed with the connecting pipe on the both sides wall of box body respectively, the one end of connecting pipe extends to in the box body in order to communicate with the box body is inside, the hole of connecting pipe comprises the straight hole and the bell mouth of mutual intercommunication, the bell mouth is located the box body, threaded connection gland on the connecting pipe outer wall in the box body, set up the sealing washer between gland and the connecting pipe, the periphery wall of sealing washer for with bell mouth complex toper structure, heat tracing cable pass connecting pipe, sealing washer and gland and stretch into the box body, the gland compresses tightly the sealing washer in the bell mouth on the connecting pipe, and the sealing washer extrudes each other with the bell mouth and makes the inner wall of sealing washer and the laminating of heat tracing cable in order to seal.

2. The explosion-proof intermediate junction box of claim 1, wherein: the top edge part fixed connection board of box body, the top of connecting plate is equipped with the recess, place sealed the pad in the recess, when lid and box body can be dismantled fixedly, compress tightly sealed pad in the recess so that box body internal seal.

3. The explosion-proof intermediate junction box of claim 1, wherein: the width of the bottom of the box body is smaller than that of the opening part of the box body.

4. The explosion-proof intermediate junction box of claim 2, wherein: the hook is fixed on one side wall of the box cover parallel to the central line of the connecting pipe and is of an L-shaped structure, and when the box cover is connected with the box body, the hook hooks the edge part of the connecting plate.

5. The explosion-proof intermediate junction box of claim 4, wherein: the connecting plate outside the groove is provided with a plurality of threaded holes, the part of the box cover corresponding to the threaded holes is provided with mounting holes, and the mounting holes in the box cover are connected with the threaded holes through screws so as to be detachably fixed with the box body.

6. The explosion-proof intermediate junction box of claim 5, wherein: when the hook on the box cover is hooked on the connecting plate, the mounting hole on the box cover is in positive correspondence with the threaded hole on the connecting plate.

7. The explosion-proof intermediate junction box of claim 2, wherein: the edge of the box cover is flush with the edge of the connecting plate.

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