WO2014007464A1

WO2014007464A1 - Protective tube for power cable connection box formed by tube compression and tube expansion

Info

Publication number: WO2014007464A1
Application number: PCT/KR2013/004549
Authority: WO
Inventors: 지상현
Original assignee: 주식회사 원컨덕터
Priority date: 2012-07-06
Filing date: 2013-05-24
Publication date: 2014-01-09
Also published as: KR20140006534A; KR101365186B1

Abstract

The present invention relates to a protective tube for a super high-voltage power cable connection box, and more particularly, a protective tube for a power cable connection box in which both ends of a copper tube having one outer diameter are compressed and expanded to be capable of corresponding to various outer diameters. The protective tube for a power cable connection box formed by tube compression and tube expansion according to the present invention may include: a compressed tube section that is the protective tube for a super high-voltage power cable connection box, is formed in a copper-based cylindrical shape, and is compressed to be connected to a metal sheath of the power cable; a cylindrical main tube section from which the tube compression and the tube expansion are absent; and a tube expansion flange section that is expanded vertically from a tip portion of the main tube section to provide a flange function.

Description

Protective tube for power cable junction box formed by shaft and expansion pipe

The present invention relates to a protective tube of an ultra-high voltage power cable junction box, and more particularly, to a power tube junction box protective tube that allows both ends of a copper tube having one outer diameter to cope with various outer diameters through shafts and expansion pipes.

Ultra high voltage power cables, especially underground cables, are installed between power plants and substations.

In general, the connection between power cables exposes the conductors built in the center of both power cables, and is connected through a part called a sleeve that electrically connects the conductors of both power cables to each other so that insulation breakdown does not occur depending on the power capacity transmitted and distributed. Insulation parts made of various insulating materials such as epoxy, insulating paper and rubber are inserted.

After the connection is completed, the protective tube is finally connected to both sides to protect the connection and act like a metal sheath of the power cable.

These protective tubes are connected to each other by a metal sheath of the electric power cable and lead-leaving work, and the other protective tubes are connected to each other.

The protective tube functions as a metal sheath of a power cable, so it is made of a copper material having excellent electrical conductivity.

The protective tube generally has a cylindrical shape. In the past, copper pipes were cut from raw materials and processed at both ends. However, as the power transmission capacity increased day by day, the outer diameter of the power cable also increased, and the outer diameter of the protective tube also increased. However, the copper pipe raw material has a problem of cost increase because the raw material value does not increase proportionally according to the size of the outer diameter but increases exponentially.

In order to prevent the rising factors of such raw materials, the thickness of the protective tube has recently become thin, and copper sheets have been rolled to produce and use copper tubes.

In connection with the cost increase, the junction box for the ultra-high voltage power cable must have a different outer diameter depending on the size of the insulated parts reinforced inside, and the outer part of the cable connection part has a large outer diameter due to the influence of the insulated parts. As the insulation parts are connected to both cable ends, the outer diameter is reduced. Therefore, the use of a straight cylindrical tube with the same outer diameter also causes unnecessary cost waste such as waste of raw materials and the amount of compound filled in the empty space of the protective tube. It is common for this to be formed differently.

For this reason, protective tubes having different outer diameters are bolted by flange coupling.

However, when welding a flange (copper alloy material) to a protective tube (copper material), there is a problem that a flange part must be additionally produced and a new process of welding the flange to the protective tube is required.

An object of the present invention for solving the above-mentioned problems is to provide a protective tube that serves as a connection protection and a metal sheath used in the connection box for the ultra-high voltage power cable, if necessary, one of the conduit and the other of the protective tube can be used to expand To provide.

In addition, one end of the protective tube and the other end is expanded to provide a protective tube that can be used as a flange replacement fitting the expanded portion.

In addition, it is to provide a protective tube for the power cable junction box that can solve the factors of the rise of raw materials by using the protective tube of the same outer diameter by expanding the shaft and pipe.

The protective tube for power cable junction box formed by the shaft tube and expansion tube according to the present invention for solving the above-mentioned problems, as a protective tube for the ultra-high voltage power cable junction box, made of the same material cylindrical, the shaft tube to be connected to the metal sheath of the power cable It can be composed of a shaft tube portion, a cylindrical main tube portion without a shaft tube or expansion tube, and an expansion tube flange portion which is vertically extended from the distal end portion of the main tube portion to function as a flange.

Here, at a predetermined position of the expansion flange portion, a fastening force auxiliary part protruding convexly in one direction may be formed to assist the fastening force between the flanges.

Here, a predetermined gasket fixing portion may be formed at a predetermined position of the expansion flange to protrude convexly in one direction to assist the fixing force of the gasket when a gasket capable of performing a sealing function between the flanges is inserted.

Here, the O-ring insert may protrude convexly in one direction so that the O-ring can be inserted when an O-ring capable of performing a sealing function between flanges is inserted at a predetermined position of the expansion flange portion.

In addition, the protective tube for the power cable junction box formed by the shaft tube and expansion tube according to the present invention is a protective tube for the ultra-high voltage power cable junction box, made of a cylindrical shape of the same material, and the tube portion is condensed to be connected to the metal sheath of the power cable; It may be composed of a cylindrical main tube portion without a shaft tube or expansion tube, and an expansion tube connection portion which is horizontally expanded from an end portion of the main tube portion to an outer diameter larger than an outer diameter of the main tube portion and bolted to an insulating tube.

In addition, the protective tube for the power cable junction box formed by the shaft tube and expansion tube according to the present invention is a protective tube for the ultra-high voltage power cable junction box, made of a cylindrical shape of the same material, and the tube portion is condensed to be connected to the metal sheath of the power cable; It is possible to fasten both protective tubes by covering the outer side of a cylindrical main tube part without a shaft tube or expansion tube and a protective tube having a same outer diameter which is horizontally expanded from the distal end of the main tube part to an outer diameter larger than the outer diameter of the main tube part and joined on the other side. It can be made with expansion connections.

In addition, the protective tube for the power cable junction box formed by the shaft tube and expansion tube according to the present invention is a protective tube for the ultra-high voltage power cable junction box, made of the same cylindrical material, the cylindrical main body portion without the shaft tube or expansion tube, and the power cable A first shaft pipe part that is concentrically connected to the metal sheath, a second shaft pipe part that is reaxially conduited between the main pipe part and the first shaft pipe part, and an expansion pipe part that is extended vertically from the distal end of the main pipe part to function as a flange Can be done.

According to the above-described configuration of the present invention, one end of the protective tube can be condensed and the other end is enlarged, and the expanded portion can be used as a replacement part of the flange. In addition, it would be possible to provide a protection tube for a power cable junction box that can reduce the overall cost of the junction box.

1 shows a protective tube for the power cable junction box formed by the shaft tube and expansion tube according to the first embodiment of the present invention.

Figure 2 shows a protective tube for the power cable junction box formed by the shaft tube and expansion tube according to a second embodiment of the present invention.

3 shows a protective tube for a power cable junction box formed by the shaft tube and expansion tube according to a third embodiment of the present invention.

Figure 4 shows a protective tube for power cable junction box formed by the shaft tube and expansion tube according to a fourth embodiment of the present invention.

Figure 5 shows a protective tube for the power cable junction box formed by the shaft tube and expansion tube according to a fifth embodiment of the present invention.

Figure 6 shows a protective tube for the power cable junction box formed by the shaft and expansion pipe according to a sixth embodiment of the present invention.

7 shows a protective tube for a power cable junction box formed by the shaft tube and expansion tube according to a seventh embodiment of the present invention.

FIG. 8 shows the protective tube shaft expansion and expansion process of the fifth and seventh embodiments shown in FIGS. 5 and 7.

FIG. 9 shows the protective tube shaft expansion and expansion process of the sixth embodiment shown in FIG.

** Description of symbols in the drawing **

11a, 21a, 31a, 41a, 51a, 61a, 71a: sheath A

11a, 21a, 31a, 41a, 51a, 61a, 71b: protective tube B

12a, 22a, 32a, 42a, 62a, 12b, 22b, 32b, 42b, 62b: shaft portion

13a, 23a, 33a, 43a, 63a, 13b, 23b, 33b, 43b, 63b: shaft tilt portion

Main building part: 14a, 24a, 34a, 44a, 64a, 14b, 24b, 34b, 44b, 64b

15a, 25a, 35a, 45a, 65a, 15b, 25b, 35b, 45b, 65b: Expansion flange

26a, 26b: tightening

force assisting part

36a, 36b, 66a, 66b: gasket fixing part

37, 67: Gasket 38a, 38b, 68a, 68b: Bolt hole

47a, 47b: O-ring insert 47: O-ring

52:

insulation cylinder

53a, 53b, 73: expansion pipe connection

72: protrusion 74: protrusion

81, 91: protective tube or copper tube 82: internal mold

83: outer mold 84: space to be expanded

85: expansion pipe 86: shaft pipe

92: shaft tube mold 93: corner shaft mold

94: expansion inner mold 95: expansion outer mold

96a: first shaft pipe portion 96b: second shaft pipe portion

96c: corner 987: gasket insertion formation

98: flange forming part 99: flange

Hereinafter, with reference to the accompanying drawings looks at the structure of the protective tube for the power cable junction box formed by the shaft and expansion pipe according to the present invention and its process, and the effect.

1 is a cross-sectional view of a protective tube for a power cable junction box formed by the shaft tube and expansion tube according to the first embodiment of the present invention.

In general, the junction box for the power cable, more specifically the intermediate junction box is formed by the pair of protective tubes (11a, 11b).

The

protective tubes

11a and 11b are formed in the shape of a cylindrical tube made of copper material, and may be made of any copper tube material or copper plate material, and the size of the outer diameter thereof varies depending on the power capacity of the power cable.

The

protective tubes

11a and 11b are connected to each other with power cables connected to each other, and are connected to a portion to which insulating components are connected for insulation reinforcement, and finally, the protective tubes are fastened to protect the inside thereof and to serve as a metal sheath.

At least one pair of these

protective tubes

11a and 11b is fastened according to the length and the connection outer diameter, and the protective tubes at both ends are respectively mechanically and electrically connected to each other in the manner of power cable metal sheath and soft wire. The connection between the two is bolted to each other through a flange or the like and is connected mechanically or electrically.

The structure of the protective tube (11a, 11b) is shown in Figure 1, the first embodiment of the present invention shown in Figure 1 is a form of a pair of protective tube is connected to the protective tube A (11a) and protective tube B (11b). Each has a form in which one end is crowned and the other end is expanded.

The protective tube A (11a) is the main tube portion 14a which maintains the form of the original tube without the shaft tube or the expansion tube, and the tube portion 12a and the main tube portion whose one end of the main tube portion 14a is condensed and connected to the power cable metal sheath. The other end of 14a is expanded and consists of the expansion pipe part 15a which serves as a flange. The main tube portion 14a and the shaft tube portion 12a have a shaft tube inclined portion 13a interposed therebetween.

Similarly, the protective tube B 11b also has a main tube portion 14b which maintains the form of an original tube without a shaft tube or expansion tube, one end portion of the main tube portion 14b which is connected to a power cable metal sheath, and is connected to a power cable metal sheath. The other end of the main pipe part 14b is expanded and consists of an expansion pipe part 15b which serves as a flange.

A is an enlarged view of

expansion flange portions

15a and 15b having a shape in which both

protective pipes

11a and 11b are connected, and both

expansion flange portions

15a and 15b are butt-coupled to each other and fastened by bolts or the like.

Here, the expansion flange portion (15a, 15b) has a form in which the outer end portion is bent in one direction, the outer side of the bent portion of the expansion pipe portion (15b) is inserted into the bent portion of the expansion flange portion (15a). Safety as a mechanical coupling is aimed at.

2 is a cross-sectional view of a protective tube for a power cable junction box formed by the shaft tube and expansion tube according to a second embodiment of the present invention.

FIG. 2 is the same in configuration except for the difference in the shape of the

expansion flange portions

25a and 25b compared with the first embodiment in FIG.

B shows a form in which the two

protective tubes

21a, 21b are butt-coupled to each other to be fastened by bolts, etc. In the first embodiment of the present invention, the parts which face-to-face contact are contacted in a straight shape, but in the case of the second embodiment, The

fastening force assistants

26a and 26b for assisting the fastening force between the flanges are formed.

The fastening

force assisting portions

26a and 26b are formed to have a semi-circular protrusion formed in the same direction on the cross-section (to the left in the drawing) to be butt-coupled to each other.

The third embodiment shown in FIG. 3 has a form in which a gasket 37 is inserted between both flanges as compared with the first and second embodiments.

C shows a form in which the two

protective tubes

31a and 31b are butt-coupled to each other to be fastened by bolts or the like through the gasket 37. In the case of the first and second embodiments of the present invention, the surface-to-face contact is performed, but the third embodiment is performed. The example has a gasket 37 insertion structure for performing a sealing function between flanges.

The gasket 37 may have a disc shape, and holes may be inserted into the outer circumferential side at equal intervals, and

gasket fixing parts

36a and 36b may be formed to assist the fastening force between the fixing of the gasket 37 and the flange. do.

The

gasket fixing parts

36a and 36b are formed in the form of semicircular protrusions in the same direction on the cross-section (to the left in the drawing) and are mediated and coupled between both

expansion pipe flanges

35a and 35b.

Since the

gasket fixing parts

36a and 36b are mediated by the flange coupling, the outer leading end bent portions of the

expansion flange parts

35a and 35b are bent in opposite directions rather than in the same direction as in the first and second embodiments. It has a form to be combined.

The fourth embodiment of the present invention shown in FIG. 4 has a structure in which an O-ring 47 is inserted rather than a gasket, as compared with the third embodiment.

Therefore, as shown in FIG. 4, the

expansion pipe portions

45a and 45b are formed such that the

protection pipes

41a and 41b are formed as D (expanded view of the coupling of both

protection pipes

41a and 41b) so that the O-ring 47 can be inserted. O-

ring inserts

46a and 46b having protrusions protruding in opposite directions to each other to form an O-ring groove when they are fastened to each other are formed.

The fifth embodiment of the present invention shown in FIG. 5 is a form in which the insulating tube 52 is interposed between the two

protective tubes

53a and 53b, unlike the first to fourth embodiments. This is an example where a slight external diameter expansion is necessary when tightened according to the external diameter.

Both

protective pipes

53a and 53b may require a slight external diameter expansion at the distal end in order to match the outer diameter of the insulating cylinder 52 at the fastening portion. At this time, the expansion

pipe connecting portions

53a and 53b may be expanded to be in contact with the insulating cylinder 52. Allow bolts to be tightened.

The sixth embodiment of the present invention shown in FIG. 6 is similar to the third embodiment, but the front end of one of the protective tubes 61b, or both of the left protective tubes or both of the protective tubes, is the main tube portion (a) and the second shaft tube portion. (b) and the case of the first shaft pipe portion c and the corner shaft pipe portion d.

That is, in the first to fifth embodiments, one end of the protective tube is condensed once, but in the sixth embodiment, the constitution other than the constitution has the same configuration.

In the first to sixth embodiments of the present invention described above, the two protective tubes are coupled to each other, but in addition, three protective tubes may be connected to each other. That is, it is possible to form expansion tube flanges at both ends as two protective tubes and the middle protective tube as in the above-described examples and to be coupled to each other. Similarly, a structure in which four or more sheaths may be connected to each other may be possible.

The fifth embodiment of the present invention has one copper tube, one end of which is axial, and the other end of which is made through a process of a slight expansion for coupling with an insulating tube. This process will be described with reference to FIG. 8.

In the case of the first to fourth embodiments and the sixth embodiment of the present invention, one copper tube has one copper tube, and the other has a structure of expansion pipe for forming a flange, which is described with reference to FIG. 9. Becomes

The seventh embodiment of the present invention shown in Fig. 7 is the expansion of the same concept as the fifth embodiment. However, the fifth embodiment is to expand the expansion connection for the connection with the insulated passage, but the seventh embodiment is to expand the expansion connection when connecting the protective tube without the insulated connection (this junction box is usually called). .

In order to fasten the two

protective tubes

71a and 71b to each other, it is common to use a copper tube having the same outer diameter and weld the flanges to tighten the flanges. However, in the present invention, the

protective tubes

71a and 71b having the same outer diameter are one side. The distal end of the protective tube 71b is expanded to form an expansion pipe connecting portion 73 so that the protective tube 71b can be fitted to the outside of the protective tube 71a to be assembled.

In the state in which both the protective tube 71b is fitted, the insertion groove 75 formed on the predetermined outer side of the protective tube 71a and the protrusion 74 formed on the predetermined outer side of the protective tube 71b are fitted together to assist the fastening force. It is possible to form the projection 72 in the protective tube 71a so as not to exceed the engagement position of both

protective tubes

71a and 71b.

Thus, as shown in the seventh embodiment of the present invention, it is possible to fasten both protective tubes by slightly expanding one of the protective tubes without the process of coupling flanges when connecting protective tubes having the same outer diameter to each other. do.

As shown in Fig. 8, first, as shown in (A), a protective tube 81 having an outer diameter required by rolling up a copper tube raw material or copper plate is prepared.

Then, the cylindrical inner mold 82 having an outer diameter corresponding to the inner diameter of the protective tube 81 is inserted into the protective tube 81 (with a spaced apart from the portion to be expanded by a predetermined distance d1), and the protective tube 81 A cylindrical outer mold 83 having an inner diameter corresponding to the outer diameter of the protective tube 81 is inserted into the outer side (B).

The outer mold 83 has two inner diameters, one having an inner diameter Φ1 corresponding to the outer diameter of the protective tube 81 and the other having an inner diameter Φ2 corresponding to the outer diameter of the protective tube 81 to be expanded.

The inner mold 82 and the outer mold 83 are inserted into each other in a state overlapping each other by a predetermined distance d2, and in this state, the protective tube 81 and the inner and

outer molds

82 and 83 are rotated by sealing (not shown). While pushing the front end portion of the protective tube 81 while expanding the expansion portion 85 is formed (C).

Thereafter, the opposite end of the expansion tube 85 is a shaft tube, but the shaft tube can be implemented in various ways, such as by heat treatment, and thus a detailed description thereof will be omitted.

Through this process, as shown in (D), one end has a tube with a slightly larger outer diameter, the other end is concentric, and the protective tube shown in FIGS. 5 and 7 can be manufactured.

The process shown in FIG. 9 is a process for manufacturing the 1st-4th and 6th embodiments of the present invention, and illustrates a process of manufacturing the protective tube 61b of the 6th embodiment as an example.

First, the protective tube 91 (copper tube) which has a predetermined outer diameter like (A) is produced.

Then, one end of the protective tube 91 is subjected to the primary shaft tube by a heat treatment step or the like to form the first shaft tube portion 96b, and in this state, the shaft tube mold 92 is moved in the direction of the arrow to the inner diameter of the protective tube 91. (B).

The shaft tube mold 92 has a tapered shape at one corner, and is inserted into the protective tube 91 with the tapered portion inward, so that the other side is aligned with the distal end of the protective tube 91, and then the secondary shaft tube in the P direction. The second shaft pipe portion 96b is formed (C).

Then, the shaft tube mold 92 is removed and the corner shaft mold 93 is inserted to form the edge 96c by conduit (D). At this time, the shaft tube of the corner portion is formed by a semicircle in a circle shape, the lower portion or the upper portion of the cross section first (by 1/2 circle), and the remaining portion. Corner shaft mold 93 is formed to be able to move up and down in the direction of the arrow. The reason for the corner shaft tube by half (circle) is to use the corner shaft mold (93) to make the shaft at one time, but you need to use a mold with the inner diameter that matches the outer diameter of the tip of the protective tube. Because you can't.

Next, in order to form the expansion pipe flange 99, the expansion pipe inner mold 94 and the expansion pipe outer mold 95 are inserted into the outer and outer sides of the protective pipe 91 while keeping the state overlapped with each other (part where the flange is to be formed). Leaving the length of the phosphorus forming portion (ⓐ)), in parallel with the rotation is pushed up to the outer mold 95 by sealing (not shown) or the like (E).

As the shape of the outer mold 95, protrusions (fastening aids 26a and 26b,

gasket fixing parts

36a and 36b, and O-

ring inserts

46a and 46b) are formed, and expansion pipes 99 having bent ends are formed. (F).

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features of the present invention. It will be appreciated that the present invention may be practiced as. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Claims

As protection tube for ultra high voltage power cable junction box,

It is made of the same material cylindrical

A conduit tube coupled to the metal sheath of the power cable;

Cylindrical main tube without shaft or expansion pipe,

A protective pipe for a power cable junction box formed by a shaft pipe and expansion pipe, consisting of an expansion pipe flange portion which is vertically piped from a distal end of the main pipe portion to function as a flange.
The method of claim 1,

The protective pipe for the power cable junction box formed by the shaft tube and expansion tube is formed at a predetermined position of the expansion pipe portion is formed with a fastening force auxiliary portion protruded convexly in one direction to assist the fastening force between the flanges.
The method of claim 1,

At a predetermined position of the expansion flange part, the gasket fixing part is formed to protrude convexly in one direction to assist the fixing force when the gasket capable of performing a sealing function between the flanges is inserted. Protective tube for power cable junction box formed.
The method of claim 1,

In the predetermined position of the expansion flange portion formed by the shaft and expansion tube, the O-ring insert is formed to protrude convexly in one direction so that the O-ring can be inserted when the O-ring capable of performing a sealing function between the flange is inserted Protective tube for power cable junction box.
As protection tube for ultra high voltage power cable junction box,

It is made of the same material cylindrical

A conduit tube coupled to the metal sheath of the power cable;

Cylindrical main tube without shaft or expansion pipe,

Protective tube for the power cable junction box formed by the shaft and expansion pipe consisting of expansion pipe connecting the insulated tube and bolted horizontally extending from the distal end of the main pipe portion to an outer diameter larger than the outer diameter of the main pipe portion.
As protection tube for ultra high voltage power cable junction box,

It is made of the same material cylindrical

A conduit tube coupled to the metal sheath of the power cable;

Cylindrical main tube without shaft or expansion pipe,

It is formed by a shaft pipe and expansion pipe made of expansion pipe connecting portion which is horizontally expanded from the distal end of the main pipe portion to an outer diameter larger than the outer diameter of the main pipe portion and covered with the outer side of the protective pipe having the same outer diameter coupled on the other side, so that both protective pipes can be fastened to each other. Protective tube for power cable junction box.
As protection tube for ultra high voltage power cable junction box,

It is made of the same material cylindrical

Cylindrical main tube without shaft or expansion pipe,

A first shaft pipe portion concentrically connected to the metal sheath of the power cable;

A second shaft pipe part reaxially piped between the main pipe part and the first shaft pipe part;

A protective pipe for a power cable junction box formed by a shaft pipe and expansion pipe, consisting of an expansion pipe flange portion which is vertically piped from a distal end of the main pipe portion to function as a flange.