KR100769715B1 - Insurating structure of under-ground switch box for preventing an electric shock - Google Patents

Abstract

An insulating structure of an underground switch box is provided to prevent an electric shock accident by using a fuse, which couples an underground cable with the underground switch box. A tube is introduced on earth. Connectors(12,42) are formed at end portions of an underground cable and an inner line. A fuse includes first and second terminals, a housing, first and second electrodes, a piston, and an elastic member. An insulator container(110) contains the fuse therein. A guiding groove is formed along a perimeter of the insulator container, which includes plural through-holes. A case(130) encloses the insulator container. A guide is formed along an inner periphery of the case such that the insulator container is rotatably fixed therein. First and second screw holes are formed on the case. A cover includes a pressing member and a fastening member. The underground cable is electrically coupled with an underground switch box by using an adaptor.

Description

Insulating structure of under-ground switch box for preventing an electric shock}

The present invention relates to an insulation structure of an underground distribution box for preventing electric shock.

Electricity transmitted from remote power plants is distributed to consumers through underground cables as they come to downtown.

Underground cables are wires with high voltage electricity installed in the ground, not in processing, which can lead to various safety accidents such as electric shock due to cobwebs in high-rise building forests and entangled urban environments. This is because it is not preferable aesthetically.

On the other hand, underground distribution box is installed for the distribution and management of electricity through the underground cable, and the underground cable itself management. These underground distribution boxes are usually placed on the ground for administrative convenience.

However, unlike overhead cable structures in which underground distribution boxes are located on telephone poles, underground cables are placed on the ground where people pass, resulting in problems that underground cables are more likely to cause electric shocks through underground distribution boxes than overhead cables.

In particular, the underground distribution box is fixed to a rigid enclosure for its protection, which is generally made of a metal of a conductive material to achieve a robust structure, the ground fault from the underground cable drawn out to the ground for connection to the underground distribution box When this occurs and flows into the enclosure, high-pressure electricity is released as it may cause a great danger to people passing through the adjacent area.

On the other hand, in order to reduce the occurrence of the above-mentioned accidents, fuses are built into the underground distribution box, and such fuses include disposable fuses made of lead and tin or alloys of zinc and tin having low melting points, and fuses using bimetal. However, in the case of the former, the underground distribution box must be managed every time to replace the fuse even in the case of a general accident in which a sudden high voltage flows instead of a short circuit, which is cumbersome in management. On the other hand, in the latter case, in case of general accidents, the electricity is temporarily cut off for protection of the underground distribution box, and when the problem is solved, the operation of re-energizing can be automatically performed to facilitate the management of the underground distribution box. When returning to the form, there was a problem that the contact could not be made closely due to the step of decreasing the density of the contact between the electrodes, the fire may occur due to high heat generated by the spark or resistance.

Accordingly, the present invention has been invented to solve the above problems, and when the underground cable drawn out to the ground and the power line drawn out from the underground distribution box, it has a disconnection function by a short circuit so that it can be quickly disconnected in the event of an accident. The technical problem of the present invention is to provide an insulation structure of an underground distribution box for preventing electric shock, which allows the high voltage electricity to be smoothly connected and disconnected by temporarily removing and discharging the electrode having a large contact area in order for the disconnected electricity to be energized again. .

The present invention to achieve the above technical problem,

In a facility consisting of a underground distribution box having a pipe surrounding and protecting the underground cable, and a power line electrically connected to the underground cable drawn to the ground,

The pipe is drawn out together with the underground cable to the ground, and a thread is formed on the outer peripheral surface of the terminal;

A connector electrically connected to ends of the underground cable and the extension wire;

A first terminal and a second terminal having an insertion hole into which the underground cable and the internal electric wire connector are electrically connected to each other, and a hollow formed along a length direction, and the first terminal and the second terminal are respectively inserted and fixed at both ends A second electrode having a housing having a sphere, and having a cylinder groove open upwardly and disposed in a hollow lower portion of the housing vertically disposed such that the first and second terminals are positioned up and down, and energizing the second terminal; A piston for sealing the cylinder groove while having a filler of a material that is injected into and expands upon receiving heat, and a cushioning means inserted into the cylinder groove so as to be movable along the cylinder groove and contacting the filler to absorb internal pressure of the filler; A first electrode disposed on the hollow and energizing the first terminal to cover and detachable from the second electrode, and a first electric field toward the second electrode; Elastic supporting the fuse body to the elastic;

An insulated container in which a guide groove is formed along a circumferential surface in a cylindrical shape having a plurality of through holes for receiving the fuse;

In the tubular shape surrounding the insulated container, a guide engaging with the guide groove is formed along the inner circumferential surface to rotatably fix the insulated container, and a first screw thread corresponding to the screw thread is formed on the lower inner circumferential surface of the pipe. Coupled to, the upper inner circumferential surface formed with a second screw thread; And

A pressurizing body having a fitting hole through which the internal electric wire passes and communicating with the fitting hole and inserted into the through hole to press the upper surface of the fuse to protrude downward, and a guide groove formed along a circumferential surface thereof; It is formed in a ring shape that is rotatably fixed while receiving the press body, the inner peripheral surface is formed with a guide projection movably engaged with the guide groove, the outer peripheral surface is a fastening mechanism formed with a third screw thread is engaged with the second screw thread threaded Cover;

An insulation structure of an underground distribution box for preventing electric shock, which electrically connects an underground cable to an underground distribution box through an adapter.

The present invention as described above, the electrical connection between the underground cable and the withdrawal wires drawn from the underground distribution box safely and intimately connected through the adapter with a built-in fuse to have a power failure function by a sudden accident, of course, It is effective in increasing the safety of underground distribution boxes and minimizing the occurrence of safety accidents such as various electric shock accidents as the power failure is stably performed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view showing a state of the insulating structure according to the present invention, will be described with reference to this.

The pipe 40 according to the present invention is provided with one or more underground cables 41 on the inside and protects the same, and is drawn out to the ground for connection with the underground distribution box 10 disposed on the ground.

The underground distribution box 10 is firmly supported and fixed on the base 20 installed on the ground, and is electrically connected to the pipe 40 and the underground cable 41 drawn out through the inlet 21 formed in the base 20. .

On the other hand, the enclosure 30 is covered for the protection of the underground distribution box 10, the enclosure 30 protects the underground distribution box 10 from direct exposure to direct sunlight and rain, as well as non-related people underground distribution box Unauthorized operation of (10) is prevented.

Figure 2 is an exploded perspective view showing the connection between the underground cable and the electric wire in the insulating structure according to the present invention, will be described with reference to this.

The underground cable 41 drawn out through the base 20 under the protection of the pipe 40 is electrically connected to the electric line 11 drawn out from the underground distribution box 10 and physically connected thereto. In the adapter 100 is provided.

In order to electrically connect the adapter 100, the underground cable 41, and the power line 11, the connectors 12 and 42 inserted into the fuse 120 are required. The connectors 12 and 42 are inserted into the first and second terminals 122 and 122 'of the fuse 120, respectively, so that the first and second terminals 122 and 122', the underground cable 41 and the electric wire ( 11) Make an electrical connection between them.

The fuse 120 is connected to the underground cable 41 (if there are a plurality of wires in the underground cable, for each wire). For reference, electricity has positive polarity, plus and minus poles, so that electricity flows through a pair of wires, and a fuse may be sufficient for only one of them. However, the fuses 120 may be connected to all of the pair of wires, respectively.

The adapter 100 includes one or more fuses 120 and includes an insulated receptor 110 having a plurality of through holes 111 to insulate each fuse.

As described above, the adapter 100 enables the electrical connection between the underground cable 41 and the power line 11 as well as physical connection. For this purpose, the adapter 100 is connected to the pipe 40. The electric wire 11 connected to the fuse 120 through the connector 12 while being tightly interlocked and supported through a rigid connection with the pipe 40 can stably adhere to its position.

Subsequently, the connection between the pipe 40 and the adapter 100 consists of the engagement of the thread 42 formed on the outer peripheral surface of the distal end of the pipe 40 and the first screw thread 132 formed on the inner peripheral surface of the case 130. The case 130 forms a circular tubular shape and is inserted while surrounding the circular pipe 40. In addition, the case 130 protects it while mounting the insulated receptor 110 therein.

As described above, the adapter 100 and the pipe 40 are tightly coupled by engaging between the first screw thread 132 of the case 130 and the screw thread 42 of the pipe 40. Or the pipe 40 must be rotatable. That is, since the engagement between the first screw thread 132 and the screw thread 42 is made of a screw method, at least one of the case 130 or the pipe 40 should be rotatable.

However, in the case of the pipe 40, since the pipe is buried underground, it is impossible for the pipe 40 to rotate. Therefore, the case 130 should be rotated. When the case 130 and the insulated container 110 are fixed to each other, the electric wire 11 and the underground cable of the fuse 120 inserted into the through holes 111 are respectively. Problems may arise as the 41 is twisted with the rotation of the case 130. Therefore, the case 130 and the insulated receptor 110 should be separated from each other and move independently. Of course, the insulated container 110 should not be separated from the case 130.

To this end, the insulated container 110 has a cylindrical shape, the guide groove 112 is formed along the circumferential surface. On the other hand, the inner circumferential surface of the case 130 forms a curved surface to which the cylindrical insulated receptor 110 is inserted and rotatably fixed, and includes a guide 131 protruding to engage with the guide groove 112. As a result, the insulated container 110 fitted to the case 130 is rotatable along the guide 131 and the guide groove 112. That is, even if the case 130 rotates for thread coupling between the pipe 40 and the case 130, the case 130 and the pipe 40 may be intimately connected without the twist of the underground cable 41 and the extension line 11. Combination is possible.

Figure 3 is an exploded perspective view showing a state of the fuse according to the present invention, will be described with reference to this.

The fuse 120 according to the present invention includes a housing 121 having a hollow 121a and a first electrode 123 and a second electrode inserted into the hollow 121a of the housing 121 and moving along the length direction. 124, a piston 125 inserted into the cylinder groove 124a of the second electrode 124, and a carbohydrate 127 that supports the first electrode 123 by carbon.

Figure 4 is a partial cross-sectional view showing the operation of the fuse according to the present invention, will be described with reference to this.

The fuse 120 forming the above-described structure will be described in more detail. The housing 121 has an insertion hole into which the connector 12 of the electric wire 11 and the connector 42 of the underground cable 41 are fitted. First and second terminals 122 and 122 'having 122a) are provided at both ends. That is, the first terminal 122 and the second terminal 122 'are disposed at both ends of the housing 121, so that the connectors 12 and 42 are opposed to each other. In this case, the first and second terminals 122 and 122 ′ are conductive materials for electrically connecting with the connectors 12 and 42, and the insertion holes 122a may be closely engaged with the connectors 12 and 42. It is formed to a size.

Subsequently, the housing 121 has a hollow 121a cut along the longitudinal direction. The second electrode 124 is disposed at one end of the hollow 121a and may be firmly fixed as necessary. The filler 129 is injected into the cylinder groove 124a, and the filler 129 may be a heavy metal such as lead or mercury, which is a material having a high coefficient of thermal expansion. This is because the material is sensitive to heat and can easily expand. However, the material of the filler 129 is not limited to the above-described example, and any material may be applied regardless of its state (solid, liquid, or gas) as long as the material has a large thermal expansion.

On the other hand, the fuse 120 according to the present invention is preferably arranged vertically, in the second electrode 124 having the cylinder groove 124a is open the cylinder groove 124a upwards to the first electrode 123 It would be nice to be located below. This is to minimize the possibility of leakage through the gap between the cylinder groove 124a and the piston 125 when the filler 129 is a liquid.

When the filler 129 is injected into the cylinder groove 124a, the piston 125 is hermetically inserted into the cylinder groove 124a. In this case, only the filler 129 may be provided as a space between the piston 125 and the cylinder groove 124a, and do not include impurities such as air. As a result, the piston 125 is reciprocated only by the force received by the filler 129 receives heat and expands.

On the other hand, the shock absorbing means 126 is fitted to one surface of the piston 125 toward the cylinder groove 124a. Preferably, the shock absorbing means 126 is a material having a large volume change with respect to an external force. When the filler 129 is heated to a certain size, the internal pressure does not directly affect the piston 125. This is to be absorbed by the buffer means (126). As a result, the piston 125 does not directly apply internal pressure to the piston 125 until the filler 129 expands to a predetermined volume or more, so that the piston 125 does not move.

Subsequently, a first electrode 123 covering the piston 125 is disposed on the second electrode 124. The first electrode 123 is mounted in the hollow 121a of the housing 121 to be in contact with or spaced apart from the second electrode 124.

Since the first and second electrodes 123 and 124 are electrically connected to the first and second terminals 122 and 122 'through the conducting wires 128, respectively, the first and second electrodes 123 and 124 may be contacted or spaced apart by the movement of the piston 125. In this case, it is determined whether the electrical connection between the electric line 11 and the underground cable 41 is made. On the other hand, it is preferable that the contact area between the first and second electrodes 123 and 124 be inclined to make the contact area between the first and second electrodes 123 and 124 as wide as possible. This widens the contact area of the first and second electrodes 123 and 124 which are independent of each other, thereby increasing the area of the first and second electrodes 123 and 124 contacted at a time when re-contacting in a separated state.

Subsequently, a carbohydrate 127 is embedded in the hollow 121a, and the carbohydrate 127 supports the first electrode 123. That is, when the first electrode 123 is in contact with the second electrode 124 at all times by the elastic force of the carbohydrate 127, the filler 129 expands to a predetermined volume or more and applies pressure to the piston 125. Under the pressure, the carcass 127 is moved while compressing. Of course, when the filler 129 is cooled and contracted, the carbbody 127 may be in contact with the second electrode 124 by blowing the first electrode 123.

FIG. 4A illustrates a normal state of the fuse 120. The resistance of the first and second electrodes 123 and 124 is performed while normal electricity flows through the first and second electrodes 123 and 124. The heat is not so great. Of course, the volume of the filler 129 does not increase by more than the specified size, so that the piston 125 is supported by the elastic force of the carbohydrate 127, so that the first and second electrodes 123 and 124 are in contact with each other. Keep it.

4 (b) shows the first and second electrode terminals 123 and 124 spaced apart from each other when the fuse 120 has a short circuit or sudden high voltage flows. The resistance heat generated while passing through the two electrodes 123 and 124 increases the volume of the filler 129 while the filler 129 is heated, and this increase in volume causes the internal pressure to rise to exert a force on the piston 125. do. Of course, the piston 125 is pushed up against the carburetor 127, and eventually the first and second electrodes 123 and 124 are spaced apart. Therefore, the electrical connection between the electric line 11 and the underground cable 41 is disconnected.

Figure 5 is an exploded perspective view showing a state of the cover according to the present invention, Figure 6 is a cross-sectional view showing a state in which the cover is coupled to the insulated container, it will be described with reference to this.

As described above, since the connectors 12 and 42 are coupled to the first and second terminals 122 and 122 ′ of the fuse 120 in an easily detachable manner, the fuse 120 connects the through hole 111. Can be moved accordingly. However, when the fuse 120 moves to the through hole 111 formed relatively longer than the length of the fuse 120, the connector 42 of the underground cable 41 firmly connected to the pipe 40 is connected to the second terminal 122. '), Which can cause a big problem. Therefore, the cover 120 is closed on the upper surface of the case 130 so that the fuse 120 inserted into the through hole 111 can be stably fixed after installation.

The cover 140 includes a pressing tube 141a inserted into the through-hole 111 of the insulated container 110 and a fitting hole 141b communicating with the pressing tube 141a and having a guide groove on a circumferential surface thereof. A ring-shaped tightening mechanism 142 having a pressing body 141 formed with a 141c and a guide protrusion 142a that is received to surround the pressing body 141 and engages with the guide groove 141c on an inner circumferential surface thereof. do.

On the other hand, the pressing tube 141a is inserted into the through-hole 111 to apply pressure to the fuse 120 mounted in the through-hole 111, the expansion portion expanded to a diameter capable of inserting the pressing tube (141a) 111a may be provided. The expansion 111a may be formed when the outer diameter of the press tube 141a is larger than the outer diameter of the fuse 120.

As a result, the electric wire 11 connected to the connector 12 is inserted into the fitting hole 141b of the pressure body 141 through the tightening mechanism 142, and then moves to the pressing tube 141a, and the pressing tube ( When it is withdrawn from 141a, it is inserted into and fixed to the first terminal 122 of the fuse 120 located in the through hole 111.

Subsequently, a second screw thread 133 is formed on the upper inner circumferential surface of the case 130, and a third screw thread 142b is formed on the outer circumferential surface of the tightening mechanism 142. That is, the tightening mechanism 142 is inserted into the upper end of the case 130, and when the tightening mechanism 142 is turned, the tightening mechanism 142 and the case 130 are connected to each other by thread coupling between the second and third screw threads 133 and 1342b. Are stopped while engaging with each other. As a result, the pressing pipe 141a is fixed by pushing the fuse 120 downward without shaking, thereby fixing the underground cable 41 and the fuse 120 floatingly.

For reference, since the guide groove 141c of the pressing body 141 and the guide protrusion 142a of the tightening mechanism 142 are movably engaged with each other, the pressing body 142 rotates for thread engagement. Since 141 may maintain a stationary state, the electric wire 11 inserted into the press body 141 may maintain the current state without twisting. In addition, since the case 130 and the cover 140 are coupled to each other by a thread coupling method, the fuse 120 can adjust the strength of the pressure received from the press tube 141a according to the rotation speed of the tightening mechanism 142. do.

1 is an exploded perspective view showing a state of the insulating structure according to the present invention,

Figure 2 is an exploded perspective view showing the connection between the underground cable and the electric wire in the insulating structure according to the present invention,

3 is an exploded perspective view showing a state of a fuse according to the present invention;

4 is a partial cross-sectional view showing the operation of the fuse according to the present invention,

5 is an exploded perspective view showing a state of a cover according to the present invention;

6 is a cross-sectional view showing the cover coupled to the insulated container.

-Explanation of terms for main parts of attached drawings-

10; Underground distribution box 20; Base

21; Inlet 30; Enclosure

40; Piping 41; Underground cable

42; Thread 100; Adapter

110; Insulated receptor 111; Through hole

112; Guide groove 120; fuse

121; Housings 122 and 122 '; Terminal 1, 2

123; First electrode 124; Second electrode

125; Piston 126; Cushioning means

127; Carbohydrate 128; Power line

129; Filler 130; case

131; Guide 132; 1st screw thread

140; Cover 141; Pressurized body

142; Fastener

Claims (1)

In a facility consisting of a underground distribution box having a pipe surrounding and protecting the underground cable, and a power line electrically connected to the underground cable drawn to the ground, The pipe is drawn out together with the underground cable to the ground, and a thread is formed on the outer peripheral surface of the terminal; A connector electrically connected to ends of the underground cable and the extension wire; A first terminal and a second terminal having an insertion hole into which the underground cable and the internal electric wire connector are electrically connected to each other, and a hollow formed along a length direction, and the first terminal and the second terminal are respectively inserted and fixed at both ends A second electrode having a housing having a sphere, and having a cylinder groove open upwardly and disposed in a hollow lower portion of the housing vertically disposed such that the first and second terminals are positioned up and down, and energizing the second terminal; A piston which seals the cylinder groove while having a filler of a material injected into and expanded by receiving heat, and a cushioning means inserted into the cylinder groove so as to be movable along the cylinder groove and contacting the filler to absorb internal pressure of the filler; A first electrode disposed on the hollow and energizing the first terminal to cover and detachable from the second electrode, and a first electrode toward the second electrode A fuse made of a carbohydrate to support the carburism; An insulated container in which a guide groove is formed along a circumferential surface in a cylindrical shape having a plurality of through holes for receiving the fuse; In the tubular shape surrounding the insulated container, a guide engaging with the guide groove is formed along the inner circumferential surface to rotatably fix the insulated container, and a first screw thread corresponding to the screw thread is formed on the lower inner circumferential surface of the pipe. Coupled to, the upper inner circumferential surface formed with a second screw thread; And A pressurizing body having a fitting hole through which the internal electric wire passes and communicating with the fitting hole and inserted into the through hole to press the upper surface of the fuse to protrude downward, and a guide groove formed along a circumferential surface thereof; It is formed in a ring shape that is rotatably fixed while receiving the press body, the inner peripheral surface is formed with a guide projection movably engaged with the guide groove, the outer peripheral surface is a fastening mechanism formed with a third screw thread is engaged with the second screw thread threaded Cover; An insulation structure of an underground distribution box for preventing electric shock, characterized in that the underground cable is electrically connected to the underground distribution box via an adapter.

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