JPH11341625A - Unit truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a unit truck which can be reduced in cost by reducing the number of parts used in its insulating member. SOLUTION: A nit truck is provided with a porcelain tube 7 having a terminal 21 provided with a junction 21a connected to a power supply bus at one end section, a fuse attaching piece 21b at the other end, and an attaching flange 21d in the middle section, a power fuse connected to the fuse attaching piece 21b, and an inserting hole 73 into which the fuse attaching piece 21b is inserted and a flange attaching section 73 to which the attaching flange 21d is attached at one end of a pipe section 71 into which the junction 21a is inserted and a truck main body on which the terminal 21, power fuse, and the porcelain tube 7 are mounted and which is housed in a box body in a state where the main body can be pulled out of the box body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit truck such as a circuit breaker incorporated in a closed switchboard.

[0002]

2. Description of the Related Art FIG. 9 is a longitudinal sectional side view schematically showing a conventional switchboard of a closed type. In this conventional switchboard, a front portion in a grounded metal box 100 is partitioned into a plurality of steps by a horizontal partition wall 101, and accommodating chambers 102 are provided. A wiring chamber 106 is provided which is partitioned by a vertical partition 105 having an insulator tube 104 for load and communicates vertically, and a power bus room 108 is provided above the wiring chamber 106 via a horizontal partition 107. The accommodation room 102 accommodates a unit carriage 110 that can be pulled out and moved along a pair of rails.

The wiring chamber 106 has a three-phase bus-side cable 112 having one end connected to the three-phase power bus 111 of the power bus chamber 108 and a three-phase load-side cable 113 having one end connected to the load. Is arranged. The other end of the bus-side cable 112 is in contact with a blade 114 disposed in the power supply insulator 103, and the load-side cable 113 is a blade 115 disposed in the load insulator 104. Are in contact.

FIG. 10 is an enlarged perspective view of a conventional unit truck. The unit truck 110 is connected to a junction 1 contacting a blade 114 in the insulator 103 for power supply.
16, and connected to the power supply bus 111 via a power supply conductor having a columnar power fuse 118 extending in the up-down direction and connected to the terminal 117, and further connected to the power supply bus 111. Is connected to the load side cable 113 via a load conductor having a terminal 120 having a junction 119 which contacts a blade 115 in the insulator tube 104.

The unit trolley 110 is equipped with an electromagnetic contactor 121 connected to the power fuse 118 and an instrument current transformer 122 connected to the electromagnetic contactor 121 and having the load conductor. A bogie main body 123 is provided.
There is provided an insulating fixing member 124 for holding the upper side 7 from above and below, and an insulating supporting member 125 for supporting the lower end of the power fuse 118. The insulating supporting member 125 extends upward from the front part of the bogie main body 123 to conceal the inside. Rectangular cover body 12
6 are provided.

FIG. 11 is an enlarged perspective view of a power supply conductor. The terminal 117 of the power supply conductor is formed by bending the other end of the strip provided with the junction 116 at one end thereof into a right angle, and connecting the bent piece 127 to the power fuse 118 through the fuse holder 128. An upper end portion is held, and an intermediate portion of the terminal 117 is fixed to the insulating fixing member 124 by being sandwiched from above and below. Power fuse 1
The lower end of 18 is supported by an insulating support member 125 provided on the carriage body 123 via a conductor.

[0007]

However, as described above, in the conventional unit truck, the insulating fixing member 124 for fixing the power supply terminal 117 between upper and lower sides is separate from the insulator 103 for the power supply. Since the number of parts of the insulating member is large, and when the switchboard is assembled, the insulator tube 1 for the power supply is provided separately from the insulating fixing member 124.
03 needs to be assembled, the workability of the assembly is poor,
There was a problem that the cost was high. Further, since the insulating fixing member 124 provided separately from the power supply insulator 103 is arranged at a predetermined interval in the moving direction of the unit truck 110, the size of the switchboard in the front-back direction is long.

Further, the cover 126 provided at the front part of the conventional unit truck 110 is formed by using a single rectangular plate, so that the high-voltage equipment inside the unit truck 110 cannot be seen from outside the cover 126. Therefore, when performing maintenance, it is necessary to open the cover 126, and it is difficult to perform maintenance.

The present invention has been made in view of such circumstances, and a junction is provided at one end and a mounting flange is provided at an intermediate portion of a terminal having a fuse mounting piece at the other end, and the junction is inserted. By providing a porcelain tube having an insertion hole through which the fuse mounting piece is inserted into one end of the cylindrical portion and a flange mounting portion to which the mounting flange is mounted, a unit truck that can eliminate the conventional insulating fixing member described above is provided. Also, by providing an opening in the cover body provided at the front part of the bogie main body so that the inside can be seen from the outside, maintenance work can be performed without opening the cover body. It is an object of the present invention to provide a unit truck that can be operated.

[0010]

A unit truck according to a first aspect of the present invention has a junction connected to a power supply bus at one end, a fuse mounting piece at the other end, and a mounting flange at an intermediate portion. A terminal, a power fuse connected to the fuse mounting piece, an insertion hole through which the fuse mounting piece is inserted into one end of a cylindrical portion into which the junction is inserted, and a flange mounting portion to which the mounting flange is mounted. And a bogie main body having these terminals, a power fuse, and an insulator tube mounted thereon and housed so as to be able to be pulled out and moved in a box body.

A unit truck according to a second invention is characterized in that the porcelain tube has a barrier wall extending from the flange mounting portion to the side opposite to the cylindrical portion to shield around the fuse mounting piece.

In a unit truck according to a third aspect of the present invention, the terminal and the power fuse are provided corresponding to a plurality of phases, and an end of an inter-phase barrier disposed between the phases is fitted to the barrier wall. A fitting portion to be combined is provided.

[0013] A unit truck according to a fourth aspect of the present invention comprises a truck main body accommodated so as to be able to be pulled out and moved into a box body, and a cover provided at a front portion of the truck main body. An opening through which the user can see is provided.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. 1 is an exploded perspective view of a power supply conductor without a power fuse, FIG. 2 is an enlarged perspective view of a unit truck, FIG. 3 is an enlarged perspective view of a power supply conductor, and FIG. 4 is a front view of the power supply conductor. Figures 5 and 5 are longitudinal side views schematically showing a switchboard, Fig. 6 is a perspective view of the switchboard, Fig. 7 is a perspective view of a state where one of the unit trucks is pulled out, and Fig. 8 is a perspective view of a housing chamber of the box. It is.

As shown in FIGS. 5 to 7, the closed type switchboard has a rectangular box-shaped metal box 1 which is long in the vertical direction and whose front part is partitioned into four steps by three horizontal partition walls 11. Accommodation room 12
Are formed as wiring chambers 13 that are vertically continuous behind the housing chambers 12. A power bus chamber 15 partitioned by a horizontal partition 14 is formed above the wiring chambers 13. The storage chambers 12 are opened / opened on the front surface of the box 1.
A lid 16 to be closed is attached.

A pair of rails (guide members) 17 extending in the front-rear direction as shown in FIG.
And a unit truck using a circuit breaker having three power supply conductors 2... And three load conductors 3. A
... are individually supported so that they can be moved back and forth. The unit carts A... Can be pulled out to the front of the box 1 by attaching adapters for the extension rails 18 to the front ends of the rails 17 as shown in FIG. .

One end of the wiring chamber 13 is connected to the load side at the rear side in the front-rear direction, and the other end is connected to each of the unit trucks A.
.. A total of twelve three-phase load side cables 19... Connected to the load conductors 3... Are held by the cable holder 20. Are connected to a rectangular support plate 5, and the upper ends of the connection buses 4 are connected to the power supply bus chamber 15. Power bus 3
Connected to 0.

A rectangular bus cover 6 is provided between the support plate 5 and each of the accommodating chambers 12 to cover the connection buses 4..., And the power supply conductors 2.
There are provided twelve insertion holes 6a through which the porcelain pipes 7 for supporting the support plate 5 are inserted.
Two load insulator tubes 8 are provided. The blades 9 connected to the load side cables 20 are held in these load insulator tubes 8.

The unit truck A has a truck body 40 having wheels 41 on the left and right sides, an electromagnetic contactor 42 mounted on the front of the truck, and a first truck on the rear of the truck body 40.
.. And an instrument transformer 44 supported via a support 43 and an instrument current transformer 46 supported via a second support 45. Sink 46
Are supported by terminals 3 having terminals 31 having junctions 31a.
.. And an instrument transformer 44 and an instrument current transformer 46 are connected to the electromagnetic contactor 42.

A unit truck A is provided at the front end of the truck body 40.
Is provided with a cover body 47 corresponding to the size of the front surface of.
The cover body 47 is provided with an opening 48 which is cut out from the lower side in the longitudinal direction center portion to the upper side so that the high voltage device of the internal electromagnetic contactor 42 can be seen from the outside. The contactor operation counter 49, the trip button 50, the nameplate and the like provided on the outside are exposed to the outside of the cover body 47 from the opening 48.

A handle 51 is provided between one side and the other side of the cover body 47, and one side and the other side are provided with mounting screws 5
2 attached to the electromagnetic contactor 42. A control connector 53 and a changeover switch 54 are provided on one side of the cover body 47. In FIG. 2, 55 is a lever for pulling out the cart.

Each of the power supply conductors 2 has a terminal 21 and a power fuse 22 attached to the terminal 21.

The terminal 21 is connected to the connection bus 4 at one end by a fork-shaped junction 21a.
A fuse mounting piece 21b whose thickness direction is different by 90 degrees is provided at the other end, and a square mounting flange 21d having a pair of screw holes 21c is provided at an intermediate part. A fuse mounting hole 21 is formed in the fuse mounting piece 21b.
The one end of the power fuse 22 formed in a horizontally long cylindrical shape is mounted by a fuse holder 24 which is provided and fixed by a mounting screw inserted into the fuse mounting hole 21e.

The fuse holder 24 includes a substantially U-shaped receiver 24a having a central portion fixed to the fuse mounting piece 21b;
A substantially semicircular curved pressing body 24b detachably connected to both ends of the receiving body 24a by a screw body 25 is provided.

The insulator tube 7 has a cylindrical portion 71 into which the junction 21a and the mounting flange 21d are inserted, and an insertion hole 7 through which the fuse mounting piece 21b is inserted into one end of the cylindrical portion 71.
2 and a flange mounting portion 73 to which the mounting flange 21d is mounted
And a fuse barrier 74 having a substantially U-shaped cross section extending from the flange mounting portion 73 in a direction opposite to the cylindrical portion 71, and a mounting screw is inserted through two screw insertion holes 75 provided in the flange mounting portion 73. The terminal 21 is attached to the flange attachment portion 73 of the insulator tube 7 by tightening the screw hole 21c of the attachment flange 21d, and the fuse attachment piece 21b is positioned in the fuse barrier 74.

A pair of screw insertion holes 77 are provided at the lower end of the flange attachment portion 73, and the mounting screws inserted into the screw insertion holes 77 are tightened to the screw holes provided in the first support base 43, whereby The insulator tube 7 is fixed to the first support 43.

An inter-phase barrier fitting portion 79 is provided on one side of the fuse barrier 74 so that one end of the plate-shaped inter-phase barrier 10 can be inserted and held.

The cylindrical portion 71 is provided with a recess 71a corresponding to the connection bus 4, so as to prevent the cylinder 71 from interfering with the connection bus 4 when the junction 21a is fitted to the connection bus 4. ing.

The other end of the power fuse 22 is connected to a fuse receiver 56 extending from the upper end of the electromagnetic contactor 42 by a fuse holder 57.

The inter-phase barrier 10 is disposed between the three-phase power fuses 22, one end of which is connected to the insulator tube 7.
The other end is fixed to a barrier receiver (not shown) extending from the upper end of the electromagnetic contactor 42 by a set screw.

Each of the load conductors 3... Has a terminal 31 having a fork-shaped junction 31 a at one end thereof which is fitted and connected to the blade 9 in the load insulator 8.
The other end of the terminal 31 is attached to the instrument current transformer 46, and the middle of the terminal 31 is supported by a supporting insulator 58 attached to the bogie main body 40.

The switchboard thus constructed is housed in the accommodation room 1.
A power supply insulator is provided on the unit truck A without providing a power supply insulator on a partition separating the wiring room 2 and the wiring chamber 13, and a connection bus is provided on the insulator pipe 7. Since the power supply terminal 21 connected to 4 is attached, the number of parts of the insulating member can be reduced.

Further, since the power supply terminal 21 can be inserted into the cylindrical portion 71 of the insulator tube 7 and its mounting flange 21d can be easily mounted with mounting screws, two insulating members as in the conventional example shown in FIG. The work of attaching the terminals is easier than that in which the terminal 21 is fixed by sandwiching between the fixing members, and the terminals 21 can be attached to one insulating member. Therefore, the workability can be improved in combination with the necessity of providing a power supply insulator tube on the partition wall, and the cost can be further reduced.

Further, since the power fuse 22 is oriented sideways and one end thereof is mounted on the fuse mounting piece 21b of the terminal 21, the terminal 21 and the insulator tube 7 are replaced even when the power fuse 22 having a different capacity is used. There is no need. That is, the power fuse 22 has a longer overall length as its capacity increases.
In the conventional example shown in FIG. 1, in which a vertically oriented power fuse is fixed to a bent piece of a terminal which is fixed by being sandwiched between two insulating fixing members, a high voltage disposed below the power fuse is used. The power fuse is arranged on the upper side to avoid interference with the device. As a result, each time the capacity of the power fuse is increased, it is necessary to replace the terminal with a piece having a different size of the bent piece. The score will increase.

Further, since the power supply terminal 21 has the mounting flange 21d inserted into the cylindrical portion 71 of the insulator tube 7 attached to the insulator tube 7 fixed to the first support base 43, the junction 21a
The distance from the tip of the power fuse 22 to the power fuse 22 can be made shorter than that in the conventional example shown in FIG. 11 in which the intermediate portion of the terminal is fixed by sandwiching between two insulating members.
Therefore, the power fuse 22 provided in the unit cart A
, The distance from the connecting busbar 4 to the connecting busbar 4 can be shortened, and the length in the front-rear direction of the box 1 can be reduced by a length corresponding to the shortened distance, and the box 1 can be downsized.

The insulator tube 7 not only fixes the terminal 21 but also provides a fuse barrier 74 having a substantially U-shaped cross section to shield the fuse mounting piece 21b of the terminal 21 to enhance the high voltage insulating effect. Therefore, the interval between the power supply terminals 21 can be reduced, and the unit truck A can be downsized.

Further, an inter-phase barrier fitting portion 79 is provided on one side of the fuse barrier 74, and the plate-shaped inter-phase barrier 1 is provided.
0 can be inserted and held, so that the distance between the two ends is smaller than that of the above-mentioned conventional terminal fixing and fixing members which are sandwiched between the two insulating fixing members. The mounting of the barrier 10 can be easily performed,
The work efficiency of assembling the entire switchboard can be increased, and the cost can be reduced.

[0038]

According to the unit truck according to the first invention,
A mounting flange is provided at an intermediate portion of the terminal, and the terminal is attached to an insulator tube having a through hole through which a fuse mounting piece is inserted at one end of a cylindrical portion into which a junction is inserted and a flange mounting portion to which the mounting flange is mounted. The number of insulating members as a whole can be reduced, the efficiency of assembly work can be increased, and the cost can be reduced.

According to the unit truck according to the second aspect of the present invention, since the insulator tube for fixing the terminal is provided with the barrier wall which covers the fuse mounting piece of the terminal, the fuse mounting piece portion of the terminal is shielded and high voltage is applied. Since the insulation effect of the power supply terminal is enhanced, the interval between the power supply terminals can be reduced, and the unit truck can be downsized.

According to the unit truck according to the third aspect of the present invention, the barrier wall of the insulator tube for fixing the terminal is provided with the fitting portion into which the interphase barrier is fitted, so that the interphase barrier can be easily attached. Thus, the work efficiency of assembling the switchboard as a whole can be increased, and the cost can be reduced.

According to the unit trolley according to the fourth aspect of the present invention, the cover provided at the front of the trolley is provided with an opening through which the inside can be seen from the outside, so that maintenance and maintenance can be performed without opening the cover. Work can be done easily.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view in which a power fuse of a power supply conductor of a unit truck according to the present invention is omitted.

FIG. 2 is an enlarged perspective view of a unit truck according to the present invention.

FIG. 3 is an enlarged perspective view of a power supply conductor portion of the unit truck according to the present invention.

FIG. 4 is a front view of a power supply conductor portion of the unit truck according to the present invention.

FIG. 5 is a longitudinal sectional side view schematically showing a switchboard according to the present invention.

FIG. 6 is a perspective view of a switchboard according to the present invention.

FIG. 7 is a perspective view of a state in which one of the unit trucks of the switchboard according to the present invention is pulled out.

FIG. 8 is a perspective view of the inside of the accommodation room of the box of the switchboard according to the present invention.

FIG. 9 is a longitudinal sectional side view schematically showing a switchboard showing a conventional example.

FIG. 10 is an enlarged perspective view of a unit truck of a switchboard showing a conventional example.

FIG. 11 is an enlarged perspective view of a conductor part for power supply of a unit truck showing a conventional example.

[Explanation of symbols]

1 box, 2 conductors, 7 insulators, 10 phase barrier, 1
7 rails, 21 terminals, 21a junction, 2
1b Fuse mounting piece, 21d mounting flange, 22 power fuse, 30 power bus, 40 bogie main body, 47 cover body, 48 opening, 71 cylindrical portion, 72 insertion hole, 73
Collar mounting part, 74 barrier wall, 79 fitting part.

Claims (4)

[Claims] 1. A terminal having a junction connected to a power supply bus at one end, a fuse mounting piece at the other end, a terminal provided with a mounting flange at an intermediate part, and the fuse mounting piece. A power fuse, an insulator tube having an insertion hole through which the fuse attachment piece is inserted at one end of the cylindrical portion into which the junction is inserted, and a flange attachment portion to which the attachment flange is attached, and these terminals, the power fuse, and the insulator tube are mounted. And a bogie main body which is housed in the box so as to be able to be pulled out and moved. 2. The unit truck according to claim 1, wherein the porcelain tube has a barrier wall extending from the flange mounting portion to a side opposite to the cylindrical portion to shield around the fuse mounting piece. 3. The terminal and the power fuse are provided corresponding to a plurality of phases, and a fitting portion to which an end of an inter-phase barrier disposed between the phases is fitted on the barrier wall. The unit truck according to claim 2, which is provided. 4. A bogie main body which is housed so as to be able to be pulled out and moved in a box body, and a cover body provided at a front portion of the bogie main body, wherein the cover body has an opening through which the inside can be seen from outside. A unit truck characterized by being provided.