CN216959532U - Special structure cable leading-in device in junction box - Google Patents

Abstract

The utility model provides a special construction cable entry, includes the screw thread overcoat, the gluey endotheca that is equipped with in the screw thread overcoat, gluey endotheca includes copper pipe and gluey cover, the external connection of gluey cover has the copper pipe, form the flame proof faying face between screw thread overcoat and the copper pipe. The utility model meets the problem that the motor lead cannot be installed in a narrow space, can well save space, saves cost and shortens the production period of the motor.

Description

Special structure cable leading-in device in junction box

Technical Field

The utility model relates to the technical field of cable leading-in devices, in particular to a cable leading-in device with a special structure in a junction box.

Background

The existing explosion-proof motor cable leading-in device adopts a terminal sleeve structure, molding compound is required to be manufactured in the terminal sleeve structure, a mold is required to be opened for manufacturing the molding compound, the cost is high, and the production period is long; the terminal sleeve structure is limited by the structure and space of the motor, and cannot be installed.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the utility model provides a special structure cable leading-in device in a junction box, which has small occupied space, low manufacturing cost and explosion suppression, and adopts the technical scheme that:

the utility model provides a special construction cable entry, includes the screw thread overcoat, the gluey endotheca that is equipped with in the screw thread overcoat, gluey endotheca includes copper pipe and gluey cover, the external connection of gluey cover has the copper pipe, form the flame proof faying face between screw thread overcoat and the copper pipe.

A copper pipe hoop is arranged in the rubber sealing sleeve, and the lead wire is in compression joint in the copper pipe hoop.

The copper pipe and the thread outer sleeve are fixed through a clamping mechanism, the clamping mechanism comprises a spring clamping ring, a groove is formed in the upper end of the copper pipe, a clamping seat is arranged at the lower end of the copper pipe, the upper end of the thread outer sleeve is arranged at the lower end of the groove, the spring clamping ring is arranged in the groove, and the lower end of the thread outer sleeve is abutted to the clamping seat at the lower end of the copper pipe.

The manufacturing method of the cable lead-in device comprises the following steps:

a: stripping an insulating layer from the end on the lead wire, wherein the stripping length is 30mm, completely inserting the stripped insulating part of the lead wire into a crimping port in a hole cavity of a copper pipe hoop, placing the copper pipe hoop into a pressing die of crimping pliers for crimping, wherein the crimping pressure is 13-16MPa, the depth of a indentation is not less than 4mm, and the crimping time is not less than 3 s;

b: preparing a rubber envelope, mixing resin CW2248 and curing agent Hy956EN, and preparing the following components: resin CW 2248100 parts: and curing agent Hy956EN 11 parts, wherein the copper pipe hoop is fixed at the middle position of the copper pipe and fixed through a tool, and the prepared adhesive sealing agent is injected into the copper pipe from special equipment for preparing the adhesive sealing agent to a specified position to complete adhesive sealing.

C: and (3) penetrating the upper end of the rubber sealing inner sleeve through the lower end of the threaded outer sleeve, when the groove at the upper part of the copper pipe is exposed, installing the spring retainer ring and coating the loctite rubber, and finishing assembly.

The center of the indentation is 8-10mm away from the end face of the copper pipe hoop; and the centers of the two pressing pits are separated by about 180 degrees by adopting double-sided pressing.

And after the copper pipe hoop is in compression joint with the lead wire, the copper pipe hoop and the lead wire are welded by tin soldering, so that a gap between the copper pipe hoop and the lead wire is filled with tin.

The utility model has the beneficial effects that: the problem that the motor lead cannot be installed in a narrow space is solved, the space can be well saved, the explosion-proof requirement of the explosion-proof motor is met by arranging the copper pipe, the time for producing a terminal sleeve opening die is saved by forming the rubber sealing inner sleeve by using the curing agent, the cost is saved, and the production period of the motor is shortened.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the construction of a threaded outer sleeve;

FIG. 3 is a cross-sectional view of a threaded outer sleeve;

FIG. 4 is a schematic view of the structure of a copper tube;

fig. 5 is a schematic diagram of a copper pipe clamp.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present invention.

As shown in fig. 1, the utility model relates to a special structure cable leading-in device in a junction box, which comprises an inner rubber seal sleeve and a threaded outer sleeve 5, wherein the outer part of the inner rubber seal sleeve is connected with the threaded outer sleeve 5. The rubber seal inner sleeve comprises a copper pipe 4 and a rubber seal sleeve 2, the copper pipe 4 is connected to the outside of the rubber seal sleeve, and an explosion-proof joint surface is formed between the threaded outer sleeve 5 and the copper pipe 4.

The copper pipe hoop 3 is arranged in the glue sleeve 2, a crimping opening 3.1 is formed in the middle of the copper pipe hoop 3, the lead wire 1 is inserted into the crimping opening 3.1 of the copper pipe hoop 3 to be crimped, the glue sleeve 2 is connected to the outside of the copper pipe hoop 3, and the copper pipe 4 is connected to the outside of the glue sleeve 2.

Fixed through clamping mechanism between copper pipe 4 and the screw thread overcoat 5, clamping mechanism includes spring rand 6, the outside of copper pipe 4 is equipped with screw thread overcoat 5, the upper end of copper pipe 4 is equipped with the recess, and the lower extreme of copper pipe 4 is equipped with the cassette, and the lower extreme at the recess is established to the upper end of screw thread overcoat 5, is equipped with the spring rand in the recess. The lower end of the thread outer sleeve 5 is abutted with the clamping seat at the lower end of the copper pipe 4.

When in use, the glue-sealed inner sleeve penetrates into the cavity of the junction box from the main cavity and penetrates through the threaded outer sleeve 5; pulling the rubber sealing inner sleeve upwards to contact with the lower part of the threaded outer sleeve 5; screwing the threaded outer sleeve 5 from the junction box to the main cavity direction, and coating the clonidine glue when screwing; and when the groove at the upper part of the copper pipe 4 is exposed, the spring retainer ring 6 is arranged and the loctite glue is coated, and the installation is finished.

According to the working principle, the lead wire 1 is arranged in the copper pipe hoop 3, the copper pipe hoop 3 is placed in the middle of the copper pipe 4, the prepared sealant is injected into the copper pipe 4 to form a sealant inner sleeve, the outer part of the copper pipe 4 is connected with the threaded outer sleeve 5, and an explosion-proof junction surface is formed between the copper pipe 4 and the threaded outer sleeve 5.

The manufacturing method of the cable leading-in device comprises the following steps:

a: stripping an insulating layer at the end of the lead wire 1, wherein the stripping length is 30mm (more than 20mm, and conforms to the regulation of GB3836.2-2010 appendix C.1.3), completely inserting the insulation stripping part of the lead wire 1 into a crimping port 3.1 in a hole cavity of a copper pipe hoop 3, putting the copper pipe hoop 3 into a pressing die of a crimping pliers for crimping, wherein the crimping pressure is 13-16MPa, the depth of a indentation is not less than 4mm, and the crimping time is not less than 3 s;

b: preparing a rubber envelope, and mixing resin CW2248 and curing agent Hy956EN according to the following preparation ratio: resin CW 2248100 g: and curing agent Hy956EN 11 g, fixing the copper ferrule 3 at the middle position of the copper tube 4 and fixing the copper ferrule by a tool (the prior art), injecting the prepared sealant into the copper tube from special equipment for preparing the sealant to a specified position, and finishing the manufacture of the sealant sleeve.

C: and (3) penetrating the rubber seal inner sleeve through the threaded outer sleeve 5, when the groove at the upper part of the copper pipe 4 is exposed, installing the spring retainer ring 6 and coating the loctite rubber, and finishing assembly.

The sealant needs to be cured at room temperature, and the curing temperature and time are generally 35 ℃ for 2h/20 ℃ for 5h/15 ℃ for 12 h. The lower limit value of the Continuous Operation Temperature (COT) of the resin CW2248 is lower than the lowest working temperature of the motor, and the upper limit value is higher than the highest operation temperature by more than 20 k; the sealant has sufficient thermal stability (meeting the specification test of GB3836.1-2010 Chapter 12 adhesive).

After the rubber seal of the rubber seal inner sleeve is cured, a voltage-resistant test is carried out, the rated voltage of the lead wire is 1140V, the lead wire of the rubber seal inner sleeve carries out the voltage-resistant test between the lead wire and the rubber seal inner sleeve, the time is 1min, and no flicker or breakdown exists; the test voltage value was 3.5 kV. And carrying out a hydraulic test, wherein leakage cannot occur between the adhesive sealing material and the lead wires during the test.

The center of each pressing pit is 8-10mm away from the end face of the copper pipe hoop, double-sided pressing is adopted, the distance between the centers of the two pressing pits is about 180 degrees, and the lead cables are firmly connected and cannot be loosened and pulled off. And (4) inspecting after the crimping is finished, and respectively pulling the lead cable by using two hands during inspection while slowly rotating and forcibly pulling the lead cable, wherein the aim is to ensure that the crimped part is not loosened and is not disconnected.

And after the copper pipe hoop 3 is in compression joint with the lead wire, the copper pipe hoop is welded by tin soldering, so that a gap between the copper pipe hoop 3 and the lead wire is filled with tin.

The utility model meets the problem that the motor lead cannot be installed in a narrow space, can well save space, meets the explosion-proof requirement of an explosion-proof motor by arranging the copper pipe, saves the time for producing a terminal sleeve opening die by forming the rubber sealing inner sleeve by using the curing agent, saves cost and shortens the production period of the motor.

The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the utility model, and such changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents.

In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "center", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the scope of the present invention.

Claims (3)

1. The special structure cable leading-in device in the junction box comprises a thread outer sleeve and is characterized in that a rubber sealing inner sleeve is arranged in the thread outer sleeve and comprises a copper pipe and a rubber sealing sleeve, the copper pipe is connected to the outer portion of the rubber sealing sleeve, and an explosion-proof junction surface is formed between the thread outer sleeve and the copper pipe.

2. The cable entry device of claim 1 wherein a copper ferrule is disposed within the adhesive enclosure and the lead wire is crimped within the copper ferrule.

3. The cable lead-in device according to claim 2, wherein the copper tube and the threaded outer sleeve are fixed by a clamping mechanism, the clamping mechanism comprises a spring collar, a groove is formed in the upper end of the copper tube, a clamping seat is formed in the lower end of the copper tube, the upper end of the threaded outer sleeve is arranged at the lower end of the groove, the spring collar is arranged in the groove, and the lower end of the threaded outer sleeve abuts against the clamping seat at the lower end of the copper tube.

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