JPH04121337U - insulation tube - Google Patents

Abstract

(57) [Summary] [Purpose] It does not have a length longer than necessary to obtain the desired withstand voltage characteristics, has a minimum number of parts, is easy to mold, can be supplied at low cost, and has an insulated connection. To provide an insulating tube that can save labor in assembling parts. [Configuration] A large diameter portion 11a is provided at one end and a small diameter portion 11 is provided at the other end.
An insulating cylinder body 1 formed by molding epoxy resin and having a
A female screw fitting 12 is embedded in the inner circumferential surface of the large diameter portion 11b, into which a male screw 5a carved in the end of one of the metal cases 5 constituting the insulating junction box is screwed, and a female screw fitting 12 is embedded in the outer circumferential surface of the small diameter portion 11b. is a female thread 5 carved on the inner peripheral surface of the end of the other metal case 5.
Embed the male screw fitting 13 to be screwed into b.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an insulating tube used for an insulated connection part of a cable.

0002

[Conventional technology]

Connect an insulating tube made of porcelain or epoxy resin as an insulated connection part of the power cable. It is known that the metal case is airtightly attached between two metal cases.

0003 Figures 2 and 3 show the insulated connections of the conventional cables made of porcelain and epoxy. FIG. 3 is an enlarged cross-sectional view showing a portion where an insulating tube made of resin is attached.

0004 In Fig. 2, the connecting portion is attached to both ends of the porcelain insulating cylinder main body 1, and a circumferential A fixing annular fitting 3 having a large number of screw holes 2 equally spaced in the direction is attached. Na In addition, the above mounting is performed by aligning the end face with the screw hole 2 with the end face of the insulating cylinder main body 1. to engage them, and adhesively fix the two through the cement layer 4. There is. Therefore, the connection is electrically connected to the metal sheath (not shown) of the power cable to be connected. The metal cases 5, 5 of the section have their flanges 6, 6 on the end face of the insulating cylinder main body 1. They are brought into contact and fixed by tightening the bolts 7, 7.

[0005] In Fig. 3, a large number of female threaded metal fittings are provided on both end surfaces of the insulating cylinder main body 1 made of epoxy resin. 8 are buried evenly distributed, and the flanges 6, 6 of the metal cases 5, 5 are in front of the bolts 7, 7. It is screwed into and tightened into the female threaded fitting 8 and fixed.

[0006]

[Problem that the idea aims to solve]

In the conventional insulating tube as described above, the fixing annular fitting 3 and the female threaded fitting 8 are attached to both sides. Because it is installed on the end face, the length is longer than necessary, in other words, to obtain the specified withstand voltage characteristics. It was considered to be longer than necessary. Also, fixing annular fittings, female thread fittings, etc. The number of parts is large, and the molding work is also difficult to work with, resulting in high costs. There were also some drawbacks. Furthermore, when assembling insulated connections, many bolts must be tightened. Therefore, the assembly work required a lot of effort and time.

[0007] This invention was developed based on the above circumstances, and is necessary to obtain the required withstand voltage characteristics. The length is not longer than necessary, the number of parts is minimal, and molding is easy. An insulating tube that can be supplied at low cost and saves labor in assembling insulated connections. is intended to provide.

[0008]

[Means to solve the problem]

The insulating tube of the present invention has a large diameter section at one end and a small diameter section at the other end, and is made of epoxy resin. On the inner circumferential surface of the large diameter part of the molded insulating cylinder main body, one side constituting the insulating junction box is provided. A female screw fitting is embedded in the end of the metal case to screw the male screw carved into the small diameter metal case. There is a male thread on the outer circumferential surface of the metal case that screws into the female thread carved on the inner circumferential surface of the other metal case end. It is characterized by having a tool buried in it.

[0009]

[Effect]

In the insulating tube of the present invention having the above configuration, the female threaded fitting on the large diameter part of the insulating tube body, the small If you screw the ends of the metal case of the connection box into the male threaded fittings on the diameter part, the metal case It is possible to electrically insulate and connect the bases.

0010

【Example】

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention. In this figure, the insulating cylinder body 11 is It has a large diameter portion 11a and a small diameter portion 11b having a smaller axial dimension than the large diameter portion 11a. Said large The diameter portion 11a has a metal cage extending from its end face to approximately the middle of the large diameter portion 11a in the axial direction. A lumen with a diameter corresponding to the end of the case 5 is provided, and one metal case is attached to the inner peripheral surface of this lumen. A female threaded metal fitting 12 is embedded therein to be screwed into the male threaded part 5a provided at the end of the base 5, and the small diameter part The outer surface of the end of 11b has a male thread that is screwed into the female thread 5b carved on the inner periphery of the other metal case 5. A screw fitting 13 is embedded.

[0011] The junction box can be assembled using the insulating cylinder main body 11 of the present invention having the above configuration as follows. be exposed. That is, the female thread fitting 12 of the large diameter portion 11a of the insulating cylinder main body 11, the small diameter portion 1 Screw the ends of the metal cases 5, 5 of the junction box into the male threaded fittings 13 of 1b, respectively. For example, the metal cases 5 can be electrically insulated and coupled together.

0012 Therefore, as is clear from the above, the insulating tube of the present invention has one end with the large diameter portion 11a. The other end is the small diameter part 11b, the large diameter part 11a is the female threaded fitting 12, and the small diameter part is the female screw fitting 12. 11b is provided with a male screw fitting 13, which is different from the conventional insulating tube shown in the example. Since the fixing annular fittings and female thread fittings are not provided on both end faces as in the case of The axial length can be set to a length necessary to obtain the pressure characteristics. In addition, ring metal for fixing Compared to the conventional insulating tube that requires parts such as fittings and female screw fittings, the number of parts is significantly greater. It is very small, and the molding of the insulating tube itself and the assembly of the insulating junction box are extremely easy. Also , since the metal case 5 does not require a flange, the insulation junction box can be made smaller. I can do it.

[0013]

[Effect of the idea]

As is clear from the above, the insulating tube of the present invention reduces the cost of the insulating junction box. Not only is it possible to use it, but it can also be used to save labor when assembling an insulation junction box. It is possible to greatly reduce the work cost of power cable installation work. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

[Fig. 2] A cross-sectional view showing an enlarged view of the part where the porcelain insulating tube is attached in a conventional cable insulating connection part.

[Fig. 3] A cross-sectional view showing an enlarged view of the part where the epoxy resin insulating tube is attached in a conventional cable insulating connection part.

[Explanation of symbols]

1, 11...Insulating tube body 2...Screw hole 3...Annular mounting bracket 4...Cement layer 5...Metal case 6...Flange 7
...Bolts 8, 12...Female threaded fittings 11a...Large diameter part 1
1b...Small diameter part 13...Male thread fitting

Claims (1)

[Scope of utility model registration request] Claim 1: A large-diameter portion is provided at one end and a small-diameter portion is provided at the other end, and the inner circumferential surface of the large-diameter portion of the insulating cylinder main body is provided with an engraved portion at one end of the metal case constituting the insulating junction box. An insulating cylinder characterized in that a female threaded metal fitting into which a male thread is screwed is embedded, and a male threaded metal fitting which is screwed into a female thread carved into the inner peripheral surface of the other end of the metal case is embedded in the outer peripheral surface of the small diameter part.