JPS634306B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application] The present invention provides a method of
This invention relates to a multi-pole type circuit breaker that temporarily disconnects one pole and simultaneously disconnects the other pole.

[Problems with Prior Art] Various configurations have been proposed for this type of multi-pole type circuit breaker for interlocking operation of other poles. For example, in Japanese Utility Model Publication No. 39-14746, one connecting shaft is used which also serves as a support shaft for the movable contact of each pole. Although this type can reduce the number of components, it is difficult to assemble because the connecting shaft constitutes the main part of the link mechanism, and it is insulated because it supports the movable contact and the link member slides. There are problems such as difficulty in maintaining the state.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a device that is easy to assemble, can easily adapt to changes in the number of poles, and can easily maintain an insulating state. The purpose is to provide a multi-pole type circuit and disconnector.

[Disclosure of the Invention] The multi-pole circuit breaker of the present invention includes a pressed portion for causing the interlocking tripping body to be rotated by a latch fitting, and a pressing portion for rotating the tripping fitting. and a through hole formed in a direction perpendicular to the parallel poles, which are supported coaxially with the tripping fitting, and a rigid interlocking shaft is inserted and fixed into the through hole.

According to the present invention, the interlocking tripping body can be supported together with the tripping fitting, and the assembly is as simple as simply inserting and fixing the interlocking shaft into the through hole.
When changing the number of poles, it is easy to change the length of the interlocking shaft, and the interlocking tripping body and the interlocking shaft do not constitute a link mechanism as in the conventional example, and are movable. Since it does not support the contacts, relatively minor measures are required to maintain the insulation state.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

1 is the main body of the cutter, which is composed of a container stand 2 and an upper lid 3 both made of synthetic resin. Reference numeral 4 denotes a power supply side terminal device installed at one end of the table 2, which is bent into an L shape and has a screw hole provided in the horizontal piece. A terminal screw 5 is inserted through the screw hole and screwed into the square nut 6 with the horizontal piece in between.

Reference numeral 7 denotes a load side terminal device installed at the other end of the device stand 2, which itself has a screw hole and also serves as a square nut, into which a terminal screw 8 is screwed.

Reference numeral 9 denotes a handle, and its operating portion 9a protrudes from the handle hole 3a of the upper lid 3. The handle 9 is
It constitutes a part of the link mechanism within the breaker main body as will be described later.

In the following, one pole of the breaker will be explained.

A fixed contact 10 is provided with a fixed contact 11 and is electrically connected to the power supply side terminal device 4.

A movable contact 12 is provided with a movable contact 13 that connects and separates from the fixed contact 11, and is electrically connected to the load-side terminal device 7 via a short-circuit current detection device and an overcurrent detection device, which will be described later. This movable contactor 12 is constructed by coupling a contact plate 14 made of copper or a copper alloy and a contact frame 15 made of iron.

A coil spring 19 serves both for contact pressure and return, and is compressed and suspended between the contact plate 14 and the support frame 17.

Reference numeral 20 denotes an overcurrent detection device, which is composed of a heater plate 21, a bimetal 22, and an adjusting screw 23. The tip 21a of the heater plate 21 and the load-side terminal device 7 are connected by a braided wire 24, and the base end 21b is fixed to the load-side relay terminal fitting 25.

26 is a short circuit current detection device, which includes a coil 27, a yoke 28, a fixed core 29, a drive rod 30, and a return spring 3.
1. Consists of an output rod 32 inserted through a fixed iron core 29, a non-magnetic cylinder 33 that guides a drive rod 30, and the like. One end of the coil 27 is fixed to the load-side relay terminal fitting 25, and the other end is fixed to the power-supply side relay terminal fitting 34, and the power-supply side relay terminal fitting 34 and the contact plate 14 are connected by a braided wire 35. The driving rod 30 has one end facing the fixed iron core 29 and the other end extending toward the movable contact 12 side, and the coil 2
When a short circuit current flows through 7 and is attracted to the fixed iron core 29, it engages with the contact rod 15 so as to directly drive the movable contact 12 to open it.

Reference numeral 36 denotes a link mechanism that links both of the detection devices 20, 26 and the movable contact 12, and is composed of a tripping metal fitting 37, a latch metal fitting 38 latched to this, a handle link 39, a contact link 40, a handle metal fitting 41, etc. be done. The link mechanism 36 is
The trip fitting 37 receives the output of the overcurrent detection device 20 or the short circuit current detection device 26 and opens the latch of the latch fitting 38, thereby opening the movable contact 12.

Reference numeral 50 denotes an interlocking tripping body, which includes a pressed portion 50a for being rotated by the latch fitting 38, a pressing portion 50b for rotating the tripping fitting 37,
It has a through hole 50c formed near the pressing part 50b in a direction perpendicular to the parallel poles, and is supported by the support frame 17 through a shaft 52 coaxially with the tripping fitting 37.

42 is an arc extinguishing grid block, and left and right insulating plates 4
3, a large number of horseshoe-shaped grids 44 are stacked at regular intervals.

Reference numerals 45 and 46 denote arc travel plates extending from the arc extinguishing grid block 42 to the vicinity of both the fixed and movable contacts 11 and 13.

These members for one pole are arranged in parallel for multiple poles (three poles in the embodiment).

Reference numeral 51 denotes an interlocking shaft made of a rigid material, which has a length spanning the through-hole 50c of the interlocking tripping body 50 of each pole, and is inserted into and fixed to the through-hole 50c. In addition,
If the interlocking shaft 51 requires insulation, the entire or necessary portion of its outer periphery is covered with an insulating member such as a nylon tube 51a.

(Operation) FIG. 2 shows that in the on state, when an overcurrent flows through one pole, the bimetal 22 deforms and displaces the tripping metal fitting 37 to release the latch of the latch fitting 38, and thus the link mechanism The movable contact 12 is opened by breaking the symmetry of 36.

In this case, a certain one-pole interlocking tripping body 50 is
The pressed portion 50a is pressed and rotated by the latch fitting 38, and the interlocking shaft 51 is also displaced to rotate the interlocking tripping body 50 of the other pole. The pressing portion 50b presses each tripping fitting 37 to release the movable contact 1 of each pole.
2 opens.

Note that the present invention can also be applied to a device without a short-circuit current detection device.

[Effects of the Invention] The multi-pole circuit breaker of the present invention includes a pressed portion for rotating the interlocking tripping body by a latch fitting, and a pressing portion for rotating the tripping fitting. and a through hole formed in a direction perpendicular to the parallel poles, this is supported coaxially with the tripping metal fitting, and a rigid interlocking shaft is inserted and fixed into the through hole, so that it can be used for interlocking. The tripping body can be supported together with the tripping metal fitting, and assembly is as simple as inserting and fixing the interlocking shaft into the through hole.When changing the number of poles, the only thing to do is to change the length of the interlocking shaft. In addition, unlike the conventional example, the interlocking tripping body and the interlocking shaft do not constitute a link mechanism, nor do they support the movable contact, making it easier to maintain the insulation state. Minor treatment is sufficient.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line DD in FIG. 1, and FIG. 3 is an exploded perspective view of a main part. 10... Fixed contact, 12... Movable contact, 2
0... Overcurrent detection device, 36... Link mechanism, 3
7...Trip fitting, 38...Latch fitting, 50...
... Interlocking tripping body, 50a... Pressed part, 50b
...Press portion, 50c...Through hole, 51...Interlocking shaft.

Claims (1)

[Claims] 1. A fixed contact with a fixed contact, a movable contact with a movable contact that connects and separates from the fixed contact, an overcurrent detection device, and a trigger that opens the latch of the latch fitting in response to the output of the overcurrent detection device. A multi-pole type circuit that includes a release metal fitting, a link mechanism that opens the movable contact when the latch is released, and an interlocking tripping body to form one pole, and these are arranged in parallel for multiple poles. In the disconnection switch, the interlocking tripping body includes a pressed portion to be rotated by a latch fitting;
It has a pressing part for rotating the tripping fitting and a through hole formed in a direction perpendicular to the parallel poles, and is supported coaxially with the tripping fitting, and a rigid interlocking shaft is attached to the through hole. A multi-pole type circuit disconnector characterized by being inserted and fixed.