JPH08222087A - Changeover switch - Google Patents

Abstract

PURPOSE: To provide a changeover switch inputted or released by switching the power from a power source to two input modes, particularly, a changeover switch improved in switching driving system for input or release in which the power can be smoothly and surely switched to the two input modes, and the whole device can be downsized. CONSTITUTION: Either one of two electromagnetic driving means 4a, 4b is selectively driven, and an oscillating arm is rotated by this driving force through a drive transmitting means 8 formed of a rack 81 and a pinion 82, so that a movable contact provided on one end of the oscillating arm is selectively inputted to either one of regular and spare fixed contacts 5, 6 on the power source side. Thus, the drive transmitting means 8 rotates the oscillating arm while suppressing the transmission loss of the driving force as much as possible, and the smooth and sure switching of the movable contact 7 can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching switch for switching the electric power from a power source between two input modes to turn on or open, and more particularly to a switching switch having an improved switching drive system for turning on or off.

[0002]

2. Description of the Related Art Conventionally, there has been a switching switch of this type shown in FIGS. 4 is a schematic plan view of a conventional switching switch, and FIG. 5 is a sectional view taken along line BB of FIG. In the figure, the conventional switching switch includes a main shaft 3 which is rotatably supported by penetrating the main body casing 1 and the mechanism casing 2, and a drive plate 31 which is housed in the mechanism casing 2 and fixed to the main shaft 3. Each of the normal and spare electromagnetic drive units 4a, 4b connected to the vehicle via transmission rods 43a, 43b.
And the fixed and stationary fixed contacts 5 and 6 which are housed in the main body casing 1 and are turned on to a power source (not shown) on the normal power source side or the standby power source side, and the main body casing 1
A movable contact 7 housed in the main shaft 3 and supported by the main shaft 3 to selectively contact the fixed or stationary fixed contacts 5 and 6.
And a configuration including.

The common (or spare) electromagnetic drive unit 4a (or 4b) has an iron core 42a (or 42b) whose one end is connected to the transmission rod 43a (or 43b), and the iron core 42.
a (or 42b) is housed in an annular shape in a penetrating state, and is excited by energization of a control current (not shown) to be excited by the iron core 42a.
Excitation coil 41 for moving (or 42b) back and forth freely
a (or 41b). The transmission rod 4
3a (or 43b) is the iron core 42a (or 42b)
The tip portion is swung along with the movement of and the driving plate 31 connected to the tip portion is rotated in the direction of the arrow in the figure.

Next, the switching operation of the conventional switching switch based on the above construction will be described. First, the regular fixed contact 5
In the state where the movable contactor 7 is connected to and the power supply is supplied from the regular power supply side, if a power failure occurs on the regular power supply side, the power failure accident is detected by the detection unit (not shown). Also, due to the power outage accident, the normal electromagnetic drive unit 4
The power supply to a is also stopped, the exciting coil 41a of the regular electromagnetic drive unit 4a is demagnetized, and the attraction of the iron core 42a by the exciting coil 41a is also deenergized. The depressurizing force of the iron core 42a also eliminates the contact pressing force of the movable contact 7 against the regular fixed contact 5, and the movable contact 7 is rotated by 90 degrees to the neutral position in the shut-off state by the opening springs 9a and 9b.

Further, a control current is supplied to the electromagnetic drive unit 4b upon detection of a power failure accident by the detection unit. By this energization, the exciting coil 41b of the preliminary electromagnetic drive unit 4b is excited and the iron core 4b is attracted and moved into the exciting coil 41b. With the movement of the iron core 42b, the transmission rod 43b is swung to rotate the main shaft 3 via the drive plate 31, and the rotation of the main shaft 3 moves the movable contact 7 from the neutral position (open state) to 90 degrees. Only by rotating the auxiliary fixed contact 6, the preliminary fixed contact 6 is contacted and pressed. In this way, even if a power failure occurs on the regular power supply side, it is possible to immediately switch to the standby power supply side and supply power to the load side connected to the movable contact 7.

[0006]

Since the conventional switching switch is constructed as described above, the switching between the regular power source side and the standby power source side is performed by switching the regular or standby electromagnetic drive section 4a,
This is performed by rotating the main shaft 3 via the transmission rods 43a and 43b by the magnetic attraction force of 4b, and there is a problem that the main shaft 3 cannot be rotated smoothly. That is, the transmission rods 43a and 43b, on which the magnetic attraction forces of the iron cores 42a and 42b of the normal or standby electromagnetic drive units 4a and 4b act as link arms for linear movement, are supported by the iron cores 42a and 42b. Since the other end is swung, a transmission loss of the driving force is generated, which causes a great obstacle to the rotational movement, and a smooth and reliable switching operation cannot be performed. In particular, this obstacle of the rotational movement is accompanied by the problem that it is impossible to secure a sufficient insulation distance between the movable contact 7 in the neutral position and the fixed and stationary fixed contacts 5, 6.

Further, the exciting coils 41a, 41b of each of the permanent or spare electromagnetic drive units 4a, 4b for generating an electromagnetic attraction force so that the main shaft 3 makes a large rotational movement.
If the iron cores 42a and 42b are designed, the size and size of the iron cores 42a and 42b increase, and the switching switch itself cannot be made compact.

The present invention has been made in order to solve the above problems, and an object thereof is to propose a switching switch which can smoothly and surely switch between two input modes for electric power and can downsize the device itself. And

[0009]

A switching switch according to the present invention switches a movable contactor in accordance with two input modes of inputting electric power from a power source and selects one of two corresponding fixed contactors on the power source side. In a switching switch that is connected or released dynamically, the movable contact is provided at one end and the other end is supported by a main shaft, and a swing arm that rotates between the two fixed contacts and the main shaft are provided. A drive transmission means formed of one gear fixed to the one gear and another gear meshing with the one gear, and a movable iron core engaging with the other gear are housed, and the movable iron core is moved by a suction force. And two electromagnetic drive means each having an exciting coil for rotating the main shaft in a predetermined direction via the drive transmission means by selectively driving and controlling one of the two electromagnetic drive means. .

In the switching switch according to the present invention, if necessary, the drive transmission means is configured such that the gear supported by the main shaft is a pinion and the other gear is a rack meshing with the pinion. It is what is done.

[0011]

In the present invention, one of the two electromagnetic drive means is selected and driven, and the swinging arm is rotated by the drive transmission means formed of a plurality of gears.
Since the movable contact provided at one end of the swing arm is selectively put into one of the two fixed contacts on the power source side, the drive transmission means suppresses the transmission loss of the driving force as much as possible. By rotating the swing arm, it is possible to smoothly and reliably switch the movable contact.

Further, in the present invention, the drive transmission means is formed by the pinion pivotally supported by the main shaft and the rack that meshes with the pinion and the movable iron cores of two electromagnetic drive means are respectively connected to both ends of the rack. As a result, smooth and reliable drive control can be performed with a simple configuration, and the device itself can be downsized.

[0013]

【Example】

(One Embodiment of the Invention) One embodiment of the present invention will be described below with reference to FIGS. 1 is a schematic plan view of a switching switch according to this embodiment, and FIG. 2 is a sectional view taken along the line AA of FIG. In the same figure, the switching switch according to the present embodiment is similar to the conventional switching switch shown in FIG. 5 in that the main body casing 1, the mechanism casing 2, the main shaft 3, and the normal and standby electromagnetic drive parts 4a. 4b, common and spare fixed contacts 5 and 6, and movable contact 7 are provided in common, and in addition to this mechanism, the main shaft 3 and common and spare electromagnetic drive parts 4 are provided.
The drive transmission means 8 formed of a rack 81 and a pinion 82 is provided between a and 4b. The drive transmission means 8 has a structure in which a pinion 82 is fixed to the main shaft 3 and both ends of a rack 81 are connected to the pinion 82. The relationship between the rack 81 and the pinion 82 is such that when the rack 81 moves, for example, 25 mm, the pinion 82 becomes 9
It is configured with a pitch of the number of teeth so as to rotate by 0 degree. The movement of the rack 81 is performed by the electromagnetic drive units 4 of the regular and the standby.
a and 4b are iron cores 42 by exciting coils 41a and 41b.
It can be arbitrarily set depending on the size capable of sucking a and 42b. The pinion 82 is configured to rotate by an angle at which the movable contact 7 can be rotated from the neutral position (open state) to the fixed or stationary fixed contacts 5 and 6 by the set moving distance.

Next, the switching operation of this embodiment based on the above configuration will be described. First, the movable fixed contact 7 is attached to the stationary fixed contact 5.
When a power outage occurs on the utility power supply side while the is connected and current is being supplied from the utility power supply side,
A detection unit (not shown) detects a power failure accident as in the above-mentioned conventional technique. Due to the power failure on the regular power source side, the current supply to the regular electromagnetic drive unit 4a, which is in pressure contact with the movable contact 7 toward the regular fixed contact 5, is stopped. When this current supply is stopped, the exciting coil 41a of the normal electromagnetic drive unit 4a is demagnetized, and the attraction of the iron core 42a by the exciting coil 41a is also deenergized.

When the suction of the iron core 42a is deenergized, the iron core 42a and the rack 81 are moved by 25 mm in the direction of the arrow A in the drawing by the opening springs 9a and 9b for urging the elastic force that always returns the rack 81 to the neutral position. Move the distance of. When the rack 81 moves 25 mm, the pinion 82 that meshes with the rack 81 rotates 90 degrees in the direction of arrow B in the figure. By rotating the pinion 82 by 90 degrees, the movable contact 7 is rotated to the neutral position and brought into an open state.

Along with this transition to the open state, the detection unit which has detected the power failure accident supplies a control current to the exciting coil 41b of the auxiliary electromagnetic drive unit 4b, and the exciting coil 41 is brought into the excited state. By exciting the exciting coil 41, the iron core 42
b is sucked in the direction of arrow A in the figure. The iron core 42b is retracted by 25 mm by the suction bias of the iron core 42b, and the opening springs 9a, 9b are accompanied by the depression of the iron core 42b.
The rack 81 is moved in the direction of arrow A in the figure by a distance of 25 mm against the elastic force (returning force in the direction of arrow E in the figure). When the rack 81 moves 25 mm, the pinion 82 that meshes with the rack 81 rotates 90 degrees in the direction of arrow C in the figure. By rotating the pinion 82 by 90 degrees, the movable contact 7 is rotated from the neutral position until it comes into contact with the preliminary fixed contact 6, and the movable fixed contact 7 is held in contact with the preliminary fixed contact 6 in a pressed state. Can be turned on to the standby power supply side.

Also, when the standby power supply side is switched on to the regular power supply side, like the above-mentioned switching from the regular power supply side to the standby power supply side, it is moved to the neutral position by rotating 90 degrees in the direction of arrow E in the figure. After that, further 90 in the direction of arrow F in the figure.
The movable contact 7 is pressed and connected to the regular fixed contact 5 by a rotation of a degree, and switching is performed.

(Other Embodiments of the Present Invention) FIG. 3 is a side view of a main portion of a switching switch according to another embodiment of the present invention. In the figure, the switching switch according to the present embodiment is the same as that shown in FIGS.
Similar to the switchgear described in 1, the main body casing 1, the mechanism casing 2, the main shaft 3, the normal and spare electromagnetic drive parts 4a and 4b are connected to the normal and spare fixed contacts 5 and 6, respectively.
And the movable contactor 7 are provided in common, and the configuration of the drive transmission means 8 is different. The drive transmission means 8 in this embodiment is
The sun gear 84 fixed to the main shaft, and the sun gear 8
4, a planetary gear 85 that revolves around the outer periphery of the sun gear 84 while rotating on its own axis, an annular gear 86 in which teeth of a predetermined pitch are formed inside the main shaft 3, and an annular gear 86. A transmission rod 87a whose both ends are swingably supported on both sides, and the other end of which is supported by the iron cores 42a, 42b of the normal and standby electromagnetic drive units 4a, 4b.
87b. The planet gears 85 can be arbitrarily selected and configured to have the same diameter as the diameter of the sun gear 84 or a diameter larger or smaller than that of the sun gear 84.

Next, the switching operation of this embodiment based on the above configuration will be described. First, in the same manner as in the above-mentioned embodiment, when a power failure occurs on the regular power source side and the standby power source side is switched to, the regular electromagnetic drive unit 4a is deactivated and the opening spring 9
a and 9b rotate the movable contactor 7 in the direction of the arrow M in the figure to the neutral position (open position) by 90 degrees and return it. With the return operation of the opening springs 9a and 9b, the iron cores 42a and 42b of the normal and standby electromagnetic drive units 4a and 4b move in the directions of arrows H and I, respectively, to an intermediate neutral position. When a detection unit (not shown) detects the power failure accident and supplies a control current to the exciting coil 41b of the preliminary electromagnetic drive unit 4b to bring it into an excited state, the iron core 42b is attracted into the exciting coil 41b.

When the iron core 42b is moved in the direction of the arrow I shown by suction, the annular gear 86 is passed through the transmission rod 87b.
Rotates at a predetermined angle in the direction of arrow J in the figure. This rotation of the annular gear 86 causes the sun gear 84 to rotate via the planetary gear 85, and the movable contact 7 rotates 90 degrees from the neutral position to the preliminary fixed contact 6 to the auxiliary power source side. Is turned on.

As described above, the sun gear 84 is rotated by a large angle (90 degrees in the case of the present embodiment) through the planetary gear 85 by the rotation of the annular gear 86 at a predetermined angle, and thus the power supply mode is changed. The switching can be smoothly performed.
Further, in addition to the switching from the regular power source side to the standby power source side, switching control from the standby power source side to the regular power source side is also executed in the same manner.

In each of the above-mentioned embodiments, only the case where the normal power source side and the standby power source side are automatically switched has been described, but the same can be applied to the case of manual or automatic and manual switching. Further, in each of the above-described embodiments, the case of switching between the normal power source side and the standby power source side has been described, but various switching operations such as switching between forward rotation and reverse rotation of the electric motor can be applied.

[0023]

As described above, in the present invention, either one of the two electromagnetic driving means is selected and driven, and the driving force is transmitted to the swing arm via the drive transmission means formed of a plurality of gears. Since the movable contact provided at one end of the swing arm is selectively turned into one of the two fixed contacts on the power source side, the drive transmission means reduces the transmission loss of the driving force. Since the swing arm is rotated while being suppressed as much as possible, it is possible to smoothly and reliably switch the movable contact. Further, in the present invention, the drive transmission means is formed by the pinion pivotally supported by the main shaft and the rack which meshes with the pinion and is connected to the movable iron cores of the two electromagnetic drive means at both ends. Therefore, the drive control can be smoothly and reliably performed with a simple configuration, and the device itself can be downsized.

[Brief description of drawings]

FIG. 1 is a schematic configuration plan view of a switching switch according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line AA of the switching switch shown in FIG.

FIG. 3 is a side view of a main part of a switching switch according to another embodiment of the present invention.

FIG. 4 is a schematic plan view of a conventional switching switch.

5 is a cross-sectional view taken along line BB in the switching switch shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body casing 2 Mechanism casing 3 Main shaft 4a, 4b Electromagnetic drive part 5 Regular fixed contactor 6 Preliminary fixed contactor 7 Movable contactor 8 Drive transmission means 9a, 9b Release spring 41a, 41b Excitation coil 42a, 42b Iron core 43a, 43b , 87a, 87b Transmission rod 81 Rack 82 Pinion 84 Sun gear 85 Planetary gear 86 Annular gear

Claims (2)

[Claims] 1. A switching switch for switching a movable contact in accordance with two input modes of inputting electric power from a power source and selectively connecting or opening to one of two corresponding fixed contacts on the power source side, A swing arm that is provided with the movable contact at one end and is supported by a main shaft at the other end and that rotates between the two fixed contacts, one gear fixed to the main shaft, and the one gear. A drive transmission unit formed of another gear that meshes with each other, and two electromagnetic drive units that house a movable iron core that engages with the other gear and that each have an exciting coil that moves the movable iron core by an attractive force. A switching switch comprising: a main shaft that is rotated in a predetermined direction via a drive transmission unit by selectively driving and controlling one of the two electromagnetic drive units. 2. The switching switch according to claim 1, wherein the drive transmission means comprises a gear whose shaft is supported by a main shaft is a pinion, and the other gear is a rack which meshes with the pinion. A switching switch characterized by being performed.