JP2009272077A - Power source changeover switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power source changeover switch that does not need a large space in a board and that is capable of reducing the number of steps in wiring. <P>SOLUTION: The power source changeover switch drives a drive handle 8 provided with a toggle mechanism by using solenoids 11 and 12 to change over between a commercial power source and the other power sources. A control board 30, on which a changeover control circuit is mounted, is disposed above the solenoids 11 and 12 via a metal plate 40. The metal plate 40 blocks the magnetic field generated by the solenoids, and also functions as a support panel for the control board 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention automatically switches the power source from a commercial power source to another power source such as an emergency power source when a power failure occurs in the commercial power source connected to the load, and automatically returns to the commercial power source when the commercial power source is restored. The present invention relates to a power supply switching switch used for switching between the two.

  The power switch is a device for switching a plurality of power supplies to supply power to a load, and is widely used in facilities having an emergency power supply (standby power supply) such as a generator for power failure countermeasures. At all times, the drive handle and the movable contact linked to this are fed to the load as the commercial power supply side, but at the time of a power failure of the commercial power supply, the drive handle is automatically switched to the other power supply side using a solenoid, etc. The power supply to the load can be continued.

  In order to automatically switch the drive handle and the movable contact, a switching control circuit is required for the power switching switch. The switching control circuit uses two relays to detect the voltage of each power supply circuit, and is preferentially connected to a commercial power supply except during a power failure. And in the conventional power supply switching switch, the control unit equipped with the switching control circuit is usually installed independently of the device main body of the power switching switch.

For this reason, the power switching switch and the control unit must be individually arranged in the panel, and there is a problem that a large space in the panel is required. Moreover, since wiring work between the power switching switch and the control unit is also necessary, there is a problem that the assembly cost increases.
JP 2003-123597 A

  Therefore, the purpose of the present invention is to automatically switch the power supply in the event of a power failure or power recovery as in the conventional product, and does not require a large space in the panel as in the conventional product, and reduces the wiring work process. An object of the present invention is to provide a power switching switch that can be used.

  In order to solve the above problems, the present invention provides a switching control on a device main body of a power switching switch that drives a drive handle provided with a toggle mechanism by a solenoid and switches between a commercial power source and other power sources. A control board on which a circuit is mounted is provided integrally.

  As described in claim 2, a structure in which the control board is arranged above the solenoid is preferable. In this case, as described in claim 3, a magnetic field generated by the solenoid is disposed between the solenoid and the control board. It is preferable to arrange a metal plate for blocking the above. Further, as described in claim 4, it is preferable that the metal plate also serves as a support plate of the control board and is fixed on the solenoid magnetic frame of the solenoid. Further, as in claim 5, a support plate also serving as a fixed iron core washer that forms a magnetic path of a magnetic field from the solenoid coil of the solenoid is disposed outside the solenoid, and a mounting portion to the base is formed at the lower end of the support plate. can do.

  Since the power supply switching switch according to the present invention is a device in which a control board having a switching control circuit mounted on the device body is integrally provided, a large space in the panel is not required, and the wiring work process can be reduced. .

Further, if the mounting position of the control board is set above the solenoid as in the second aspect, the large control board can be arranged with a margin, and the apparatus can be made compact. In this case, if a metal plate is arranged between the solenoid and the control board as in claim 3, the relay or the like will not malfunction due to the magnetic field generated by the solenoid. Furthermore, if the structure of Claim 4 is employ | adopted, a control board and a metal plate can be attached firmly. If the structure of claim 5 is adopted, since the support plate also has the function of a fixed iron core washer that forms a magnetic path of the magnetic field from the solenoid coil of the solenoid, the number of parts can be reduced as compared with the conventional product.
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a power switch according to the present invention, FIG. 2 is a front view, FIG. 3 is a right side view, and FIG. 4 is an explanatory diagram of an internal structure. In the present specification, the bottom surface side of the power switching switch will be described as the lower side. However, in the actual use state, the bottom surface of the power switching switch is usually fixed to the vertical surface of the panel.

  In these drawings, reference numeral 1 denotes a device main body of a power supply switching switch. A rotatable cross bar 2 is provided at the lower center of the device body 1, and a contact bar 4 having a movable contact 3 is provided integrally with the cross bar 2. Fixed contacts 5 and 6 are provided at the left and right positions inside the device main body 1, and the movable contact 3 can be brought into contact with any one of the fixed contacts 5 and 6 as schematically shown in FIG. ing.

  For example, if the fixed contact 5 is connected to the commercial power source and the fixed contact 6 is connected to the emergency power source, the load terminal 7 to the load is changed to the emergency power source by switching the direction in which the contact bar 4 is tilted by rotating the cross bar 2. It is possible to switch between a connected state and a state connected to a commercial power source. Note that power supply input terminals 5 a and 6 a corresponding to the fixed contacts 5 and 6 are provided on the left and right sides of the device body 1.

  In order to allow the movable contact 3 to be tilted to either the left or right side in this way, the crossbar 2 is protruded to the side of the device body 1, and a drive handle 8 for rotating the crossbar is provided at the protruding portion. Is provided. As shown in FIG. 2, a rod 8 a is provided on the side surface of the drive handle 8, and this rod 8 a is fitted in the long hole 10 of the connecting member 9.

  The connecting member 9 is held between the distal ends of the plungers 13 and 14 of the pair of left and right solenoids 11 and 12. The solenoids 11 and 12 are known ones including electromagnetic coils 11a and 12a and fixed iron cores 11b and 12b. For this reason, the solenoids 11 and 12 can be moved left and right, and the drive handle 8 is also moved left and right in accordance with the movement of the connecting member 9, so that the crossbar 2 can be rotated left and right. . However, a stable contact pressure cannot be obtained between the movable contact 3 and the fixed contacts 5 and 6 simply by rotating the cross bar 2 and bringing the contact bar 4 into contact with the fixed contacts 5 and 6. The mechanism is incorporated.

  That is, as shown in FIG. 2, a pair of link arms 15 and 16 extending in a direction perpendicular to the drive handle 8 are fixed to the tip of the crossbar 2 and fixed to the pin at the tip of the link arm and the lower part of the device body 1. Coil springs 19 and 20 are arranged between the pins 17 and 18, respectively. Since the pins 17 and 18 and the crossbar 2 are substantially collinear, the neutral state in which the link arms 15 and 16 are horizontal in FIG. 2 and the drive handle 8 is on the center line is an unstable state. When the drive handle 8 is slightly rotated in any direction from the neutral point, the coil springs 19 and 20 push the link arms 15 and 16 to rapidly rotate the drive handle 8 and take a stable state. Therefore, if the drive handle 8 is rotated by the solenoids 11 and 12 until the neutral point is exceeded, the crossbar 2 is instantaneously rotated by the coil springs 19 and 20, and the movable contact 3 is fixed to any fixed contact with a constant pressure. 5 and 6 can be contacted.

  As described above, the power supply switching switch according to the present invention switches the contacts by the solenoids 11 and 12 and enables power supply from the emergency power supply to the load in the event of a power failure. Thus, a switching control circuit for outputting an operation signal to the solenoids 11 and 12 is necessary. In the present invention, a control board 30 on which a commercial power supply priority switching control circuit is mounted is disposed on the device main body 1. On the control board 30, an electronic circuit including a voltage detection relay 31, a surge protection element 32, a fuse 33, and the like is mounted.

  Although the control board 30 is disposed above the solenoids 11 and 12, in order to prevent malfunction of the electronic circuit due to the influence of the magnetic field generated when the solenoids 11 and 12 are operated, the control board 30 and the solenoids 11 and 12 Between these, the metal plate 40 is arrange | positioned.

  As shown in FIG. 5, the metal plate 40 includes upper bent portions 41 at both ends, and is screwed to the upper portions of the solenoid magnetic frames 42 and 43 of the solenoids 11 and 12. Further, the central portion 44 of the metal plate 40 is cut out so as to avoid interference with the drive handle 8 of the crossbar 2. The width in the left-right direction of the metal plate 40 may be the same as the width in the left-right direction of the control board 30, but only the part of the control board 30 that needs to shield the magnetic field needs to be handled.

  The metal plate 40 also serves as a support plate for the control board 30, and the control board 30 is screwed to the upper surface of the metal plate 40 via a spacer 34. By using such a metal plate 40, the control board 30 can be stably held above the solenoids 11 and 12, and malfunction due to the magnetic field generated by the solenoids 11 and 12 can be prevented.

  In this embodiment, a support plate 50 is erected on both outer sides of the solenoids 11 and 12, and a metal cover 51 that covers the upper surface of the control board 30 at its upper end and a transparent protection that covers the upper surface of the device body 1 made of a transparent resin. A cover 52 is attached. These covers are effective for ensuring safety, but are not essential in the present invention, and may be omitted.

  The solenoids 11 and 12 need fixed iron core washers that connect the fixed iron cores 11b and 12b and the solenoid magnetic frames 42 and 43 to form a magnetic path of the magnetic field from the solenoid coils 11a and 12a. Conventionally, a disk-shaped washer has been used. However, in this embodiment, the support plate 50 is a steel plate, and has a function as a fixed iron core washer. The lower end of the support plate 50 is bent to form an attachment portion 53 to the base. An attachment portion 54 to the base similar to the conventional case is formed in the lower part of the device main body 1, and attachment to the in-board base is possible using these attachment portions 53 and 54. By using the support plate 50 that also functions as such a fixed iron core washer, the number of parts can be reduced.

  The power supply switching switch of the present invention configured as described above is controlled by a commercial power supply priority switching control circuit, and always supplies power from the commercial power supply to the load. When the commercial power supply fails, the solenoid 12 The power supply is automatically switched to an emergency power supply and the power supply to the load is continued. When the commercial power supply is restored, the power supply is automatically switched to the commercial power supply by the solenoid 11 and the power supply to the load is continued. This is the same as the conventional power switch.

  However, since the control board 30 equipped with the switching control circuit is integrally provided on the device main body 1 of the power switching switch, it is different from the conventional one in which the control unit is provided separately. In addition, a large board space is not required, and the wiring work process between the control board 30 and the device main body 1 can be reduced. In particular, as shown in the embodiment, if the control board 30 is disposed above the solenoids 11 and 12 via the metal plate 40, the space is not wasted and the whole can be made compact. In addition, the control circuit does not malfunction due to the magnetic shield effect of the metal plate 40.

It is a top view which shows embodiment of this invention. It is a front view which shows embodiment of this invention. It is a right view which shows embodiment of this invention. It is explanatory drawing of an internal structure. It is a perspective view of a metal plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus body 2 Cross bar 3 Movable contact 4 Contact bar 5 Fixed contact 5a Power input terminal 6 Fixed contact 6a Power input terminal 7 Load terminal 8 Drive handle 8a Rod 9 Connecting member 10 Long hole 11 Solenoid 11a Electromagnetic coil 11b Fixed iron core 12 Solenoid 12a Electromagnetic coil 12b Fixed iron core 13 Plunger 14 Plunger 15 Link arm 16 Link arm 17 Pin 18 Pin 19 Coil spring 20 Coil spring 30 Control board 31 Voltage detection relay 32 Surge protection element 33 Fuse 34 Spacer 40 Metal plate 41 Upper bent portion 42 Solenoid Magnetic frame 43 Solenoid magnetic frame 44 Central portion 50 of metal plate Support plate 51 Metal cover 52 Transparent protective cover 53 Mounting portion 54 Mounting portion

Claims (5)

  A drive board equipped with a toggle mechanism is driven by a solenoid, and a control board equipped with a switching control circuit is integrally provided on the main body of a power switching switch that switches between commercial power and other power sources. Power switching switch.   2. The power switching switch according to claim 1, wherein the control board is disposed above the solenoid.   The power supply switching switch according to claim 2, wherein a metal plate for blocking a magnetic field generated by the solenoid is disposed between the solenoid and the control board.   4. The power switching switch according to claim 3, wherein the metal plate also serves as a support plate for the control board and is fixed on a solenoid magnetic frame of the solenoid.   A support plate also serving as a fixed iron core washer that forms a magnetic path of a magnetic field from an electromagnetic coil of the solenoid is disposed outside the solenoid, and a mounting portion to the base is formed at the lower end of the support plate. The power switching switch according to 1.

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