JP5134407B2 - Magnetic contactor - Google Patents

Description

The present invention, power from a plurality of phases of the power supply conductor, an electromagnetic contactor via fuses and switches, which are mounted on a mobile-type truck having wheels to supply to the load conductor.

In general, mobile devices used for switchboards include carts for main switches such as circuit breakers and magnetic contactors, and carts for auxiliary devices such as transformers (VT) and lightning arresters (LA). . These are required to be configured more compactly from the viewpoint of downsizing the switchboard.
As a conventional distribution board for electrical equipment, for example, a distribution box having an electrical equipment room formed inside a floor surface, and an electrical equipment having wheels and movable in the front-rear direction formed at one end of the distribution box are guided. In what consists of a guide plate, a hinge for rotatably connecting the guide plate provided between the guide plate and the floor, and a fastening means provided between the hinge and the guide plate, There is known a switchboard for electrical equipment in which the fastening means is formed so that the guide plate can move up and down.
JP 58-29307 A

  However, in the conventional example described in Patent Document 1, since the guide plate can move up and down, no gap is generated between the guide plate and the distribution box, and dust and small animals are prevented from entering. Although it is possible to obtain a switchboard for electrical equipment, the electrical equipment not only has the disadvantage that the height dimension is increased, but also the installation work of components in the electrical equipment due to the increased depth of the electrical equipment There is an unsolved problem that the replacement work becomes difficult.

The present invention has been made in view of the unsolved problems of the above prior art, and its object is to provide an overall electric magnetic contactor Ru can be miniaturized configuration.

In order to achieve the above object, an electromagnetic contactor according to claim 1 supplies power from a plurality of power source conductors to a load conductor via a fuse and an opening / closing part mounted on a movable carriage having wheels. An electromagnetic contactor, wherein a transformer and a current transformer connected to at least the opening / closing portion disposed on a bottom plate of the movable carriage are provided with a central axis of the wheel and a guide surface with which the wheel contacts. At least one of the transformer and the current transformer disposed on the bottom plate is detachably attached to the bottom plate from below .

According to the present invention, there is provided an electromagnetic contactor having a movable carriage, and at least a transformer and a current transformer disposed on the bottom plate of the movable carriage between the bottom plate and the guide surface with which the wheel contacts. By adopting a structure that is mounted in a protruding state, an effect can be obtained that the empty space can be efficiently used and the height of the movable carriage of the electromagnetic contactor can be reduced.
Also, in the electromagnetic contactor, by attaching the lower detachably to the bottom plate at least one of the transformers and current transformers are disposed on the bottom plate, the capacity of the transformer and current transformer of the built and load An effect is obtained that the current transformer can be easily replaced when it is changed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view, partly in section, showing an embodiment in which the present invention is applied to an electromagnetic contactor. In the figure, 1 is an electromagnetic contactor. It is stored in a storage shelf 3 formed on the switchboard 2 so as to be able to move forward and backward.
The electromagnetic contactor 1 has a movable carriage 5 having wheels 4, and various components are mounted on the movable carriage 5. The movable carriage 5 includes a bottom plate 6 on which the wheels 4 are disposed, and an intermediate support plate 8 supported in parallel on the bottom plate 6 via a support column 7.

The fuses 18 u, 18 v and 18 w are fixed in parallel to the fuse accommodating portion of the intermediate support plate 8 with the axial direction thereof directed in the advancing / retreating direction of the movable carriage 5. Since the fuses 18u, 18v and 18w have the same configuration, the one-phase fuse 18u will be described.
The fuse 18u has a cylindrical main body 18a, and a power supply side terminal 18b and a load side terminal 18c formed at both ends of the main body 18a. These terminals 18b and 18c are clamped by clamping metal fittings 19a and 19b, respectively, and the clamping metal fittings 19a and 19b are fastened by a fastening tool 19 such as a bolt to fix the fuse 18u.

In addition, power supply conductors 21u to 21w are arranged extending in the vertical direction at substantially the center of the side surface of the power supply side terminal 18b of the fuses 18u to 18w.
The power supply side terminals 18b of the fuses 18u to 18w and the power supply conductors 21u to 21w are electrically connected as follows. That is, as shown in FIG. 2, relay conductors 22u to 22w electrically connected to the power supply side terminals 18b of the fuses 18u to 18w are arranged, and the relay conductors 22u to 22w are in contact with the power supply conductors 21u to 21w. Power supply contacts 23u to 23w are provided. Each of the power contacts 23u to 23w is fixed to the relay conductors 22u to 22w by screws.

Then, by moving the movable carriage 5 forward and backward, the power contacts 23u to 23w are brought into contact with or separated from the power conductors 21u to 21w, thereby electrically connecting the power conductors 21u to 21w and the power contacts 23u to 23w. Connect and separate.
The load side terminals 18c of the fuses 18u to 18w are electrically connected to the movable side conductors 28u to 28w of the open / close portions 27u to 27w via the contacts 25u to 25w. Here, each of the opening / closing parts 27u to 27w uses a vacuum valve in this embodiment.

The movable side conductors 28u to 28w of the open / close portions 27u to 27w are connected to the operating device 31 through the surface plate 30 through the insulators 29u to 29w.
The fixed conductors 32u to 32w of the opening / closing parts 27u to 27w are fixed to the insulating support part 26 by a fastening tool 33 such as a bolt and nut.
On the other hand, on the bottom plate 6 of the movable carriage 5, a transformer 40 is disposed at the surface plate 30 side position, and a current transformer 50 is disposed at the opposite side position.

  As shown in FIG. 4, a mounting bracket 44 is screwed to the bottom side of the main body 42 of the transformer 40 and is integrally attached. The mounting bracket 44 includes a housing recess 44a that protrudes downward at the center portion and houses the main body 42, and a mounting plate portion 44b that extends outward in the front-rear direction from the front and rear ends of the housing recess 44a. The main body 42 of the transformer 40 is fixed to 44 a in a state where the bottom surface protrudes below the bottom plate 6 and below the central axis of the wheel 4.

  Then, the transformer 40 inserts the main body 42 and the insulating cylinder 43 into a rectangular through hole 6 a formed in the bottom plate 6 from the lower side of the bottom plate 6 of the movable carriage 5, and the mounting plate portion 44 b of the mounting bracket 44. Is attached to the bottom plate 6 with screws 45 in a state in which is in contact with the periphery of the through hole 6 a of the bottom plate 6. In this state, the bottom surface of the main body 42 of the transformer 40 is located below the bottom plate 6 and between the central axis of the wheel 4 and the contact surface of the storage shelf 3 of the wheel 4. Thus, the height of the electromagnetic contactor 1 can be kept low by lowering the installation position of the transformer 40 having a high height.

Further, in the transformer 40, two primary lead lines 45a and 45b are connected to the U-phase load side terminal 46u of the fuse 18u and the V-phase load side terminal 46v of the fuse 18v, as shown in FIG. Yes.
On the other hand, the current transformer 50 is fixed integrally with a mounting bracket 53 screwed to the bottom of the main body 52. The mounting bracket 53 includes a plate portion that engages the bottom side surface and the bottom bottom surface of the current transformer 50 and a mounting plate portion that contacts the bottom surface of the bottom plate 6 of the movable carriage 5.

  Then, the current transformer 50 inserts the main body 52 into the substantially square through hole 6 b formed in the bottom plate 6 from the lower side of the bottom plate 6 of the movable carriage 5, and attaches the mounting plate portion of the mounting bracket 53 to the bottom plate 6. It is attached to the bottom plate 6 with screws 54 while being in contact with the periphery of the through hole 6b. In this state, the bottom surface of the main body 52 of the current transformer 50 is positioned below the bottom plate 6 and between the central axis of the wheel 4 and the contact surface of the storage shelf 3 of the wheel 4. 3 can be used effectively.

As shown in FIG. 3, the current transformer 50 includes a primary power supply side terminal 55 a and a primary load side terminal 55 b, and the primary power supply side terminal 55 a and the primary load side terminal 55 b are arranged on the upper side of the current transformer 50. It is pulled out to the open / close sections 27u to 27w, respectively.
The primary power supply side terminal 55a is connected to the fixed side conductor 32u of the opening / closing part 27u. The primary load side terminal 55b and the load side contactor 56 are fixed by fastening means 57 composed of bolts and nuts.

The load side contactor 56 is connected to the load conductor drawing portion 9 as shown in FIG. The load conductor lead-out portion 9 is attached to the load conductor support portion 61.
Next, the operation of the above embodiment will be described.
First, in order to assemble the magnetic contactor 1, the fuses 18 u to 18 w are fixed on the intermediate support plate 8 of the movable carriage 5 on the outside of the switchboard 2, and the open / close portions 27 u to 27 w are provided on the lower surface side of the intermediate support plate 8. And the insulators 29u-29w are arrange | positioned.

In this state, the transformer 40 is inserted into the through hole 6 a formed in the bottom plate 6 from the outside of the bottom plate 6, and the mounting bracket 44 is integrally attached to the lower surface side of the bottom plate 6 with screws 45.
The primary lead wires 45a and 45b of the transformer 40 are connected to the fuse load side terminals 46u and 46v.
On the other hand, the contact 56 on the load side is connected to the primary power supply side terminal 55a protruding from the upper side of the two current transformers 50, the terminal 55b on the primary side is connected to the fixed side conductor 32u, and bolts and nuts are used. The fastening means 33 is fixed by fastening.

  Accordingly, the power contacts 23u to 23w are connected to the power supply side terminals 18b of the fuses 18u to 18w via the relay conductors 22u to 22w, and the load side terminals 18c of the fuses 18u to 18w are connected via the contacts 25u to 25w. Connected to the movable side conductors 28u to 28w of the open / close portions 27u to 27w. Moreover, the movable side conductors 28u to 28w are connected to the operation device 31 via the insulators 29u to 29w.

Furthermore, the fixed side conductors 32u to 32w of the open / close portions 27u to 27w are individually connected to the primary power supply side terminal 55a of the current transformer 50, and the primary load side terminal 55b of the current transformer 50 is connected to the load side contactor 56 with a bolt nut. The fastening means 57 is fixed.
Next, the wheels of the movable carriage 5 of the electromagnetic contactor 1 are brought into contact with the upper surface of the storage shelf 3 of the switchboard 2 and pushed, for example, while guiding the side surface of the storage shelf 3 by the side surface of the storage shelf 3. 23 w is in contact with the power supply conductors 21 u to 21 w, and the load side contactor 56 is in contact with the load conductor drawing portion 9.

Thereby, the electric power fed from the power supply conductors 21u to 21w is output to the load conductor drawing portion 9.
On the other hand, when exchanging the current transformer 50, the movable cart 5 is pulled out from the storage shelf 3 of the switchboard 2, moved to another location, and then the screw 54 of the mounting bracket 53 is removed. 50 can be easily replaced without being obstructed by the upper opening / closing parts 27u to 27w and the transformer 40, and a new current transformer 50 is inserted into the through hole 6b, and the mounting bracket 53 is fixed to the bottom plate with the screw 54. Fix to 6.

Similarly, when the transformer 40 is replaced, the transformer 40 can be easily replaced with a new transformer by removing the screws 45 and removing the mounting bracket 44 from the bottom plate 6.
As described above, according to the above embodiment, the transformer 40 and the current transformer 50 are arranged on the bottom plate 6 with the bottom portion being disposed between the center of the wheel 4 and the contact surface of the storage shelf 3 of the wheel 4. Since the tall transformer 40 can be disposed at a low position, the height of the electromagnetic contactor 1 itself can be reduced, and the electromagnetic contactor 1 can be miniaturized.

Further, since the transformer 40 and the current transformer 50 are inserted through the through holes 6a and 6b from the lower side of the bottom plate 6 and are detachably attached to the bottom plate 6 by the mounting brackets 44 and 53, the transformer 40 and the current transformer 50 are mounted. Can be easily exchanged, and the work time required for the exchange can be greatly reduced.
In the above-described embodiment, the case where the bottom surfaces of the transformer 40 and the current transformer 50 are held on the bottom plate 6 of the movable carriage 5 has been described. However, the present invention is not limited to this. The position corresponding to the transformer 40 and the current transformer 50 of FIG. 6 is a recessed part protruding downward as compared with the other part, and a through hole is formed in this recessed part so that the transformer 40 and the current transformer 50 are You may make it attach so that attachment or detachment is possible from the lower side.

  Moreover, although the case where this invention was applied to the electromagnetic contactor 1 was demonstrated in the said embodiment, it is not limited to this, The mobile device of the form which mounted the apparatus on the mobile trolley which has a wheel If so, the present invention can be applied.

It is the side view which made the cross section the part showing the whole structure of one Embodiment of this invention. It is a top view of FIG. It is sectional drawing on the AA line of FIG. FIG. 4 is a bottom view of FIG. 3.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electromagnetic contactor, 2 ... Distribution board, 3 ... Storage shelf, 4 ... Wheel, 5 ... Moving cart, 6 ... Bottom plate, 6a, 6b ... Through-hole, 8 ... Intermediate support plate, 9 ... Load side drawer part, 18u -18w ... fuse, 21u-21w ... power supply conductor, 23u-23w ... power contact, 27u-27w ... switching part, 40 ... transformer, 44 ... mounting bracket, 50 ... current transformer, 53 ... mounting bracket

Claims (1)

An electromagnetic contactor for supplying electric power from a power conductor of a plurality of phases to a load conductor via a fuse and a switching unit mounted on a movable carriage having wheels,
A transformer and a current transformer connected to at least the opening / closing portion disposed on the bottom plate of the movable carriage are attached so as to be positioned between a central axis of the wheel and a guide surface with which the wheel contacts ,
An electromagnetic contactor, wherein at least one of the transformer and the current transformer disposed on the bottom plate is detachably attached to the bottom plate from below .

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