JPS5934044Y2 - circuit break - Google Patents

Description

[Detailed description of the invention] This invention relates to a circuit breaker. In particular, when a movable contact contacts a fixed contact by mechanical driving force, when the movable contact approaches the fixed contact to a predetermined distance, This invention relates to a circuit breaker in which a movable contact is attracted by the attractive force of a permanent magnet, and the movable contact is brought into contact with a fixed contact at high speed.

Conventionally, this type of circuit breaker uses mechanical driving force to bring the movable contact into contact with the fixed contact, but the speed at which the movable contact contacts the fixed contact is slow, and arcing occurs between both contacts. As a result, both contacts are severely worn out, and arc heat causes welding of both contacts when they are turned on.
It could not be used in the electric circuit of v.

Further, in order to use the movable contact in a 460V electric circuit, the movable contact must be made into a toggle link mechanism, but the toggle link mechanism has the drawbacks of a complicated structure, poor assembly efficiency, and high cost.

This idea was made in view of the shortcomings of the conventional method, and consists of bottoming the movable contact conductive plate with a spring material, and attracting and deforming the movable contact conductive plate at high speed with a permanent magnet. The object of the present invention is to provide a circuit breaker with a simple structure that allows a movable contact to firmly contact a fixed contact without requiring mechanical driving force or mechanical restraining force.

This idea will be explained below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of the circuit breaker according to the invention in a tripped state.

In FIG. 1, a terminal screw 2 is attached to a base 1.

The terminal screw 2 connects one end of the fixed contact conductive plate 3 to an external conductor (not shown).

The fixed contact 4 is attached to the other end of the fixed contact conductive plate 3.

The movable contact 5 is attached to one end of the movable contact conductive plate 6 opposite to the fixed contact 4.

The movable contact conductive plate 6 is made up of a laminated conductive spring material to have spring properties and a magnetic material to be firmly attracted to a permanent magnet 7 (described later). The end is attached to the base 1.

The permanent magnet 7 has a parallel portion 7a. 7b and is attached to the base 1, and the other end 6 of the movable contact conductive plate 6 is attached to the parallel part 7a.
a is rotatably supported, the movable contact conductive plate 6 is attracted by the parallel portion 7b, and the movable contact 5 and the fixed contact 4 are brought into contact with each other.

The holding plate 8 is provided with a hole 8a through which the movable contact conductive plate 6 is movably penetrated in the opening direction, and is configured as shown in FIG. 2.

FIG. 2a is a side view showing one embodiment of the presser plate 8, and FIG. 2a is a top view of FIG. 2a.

As shown in FIG. 2, three holes 8a are formed in order to allow the movable contact conductive plates 6 of phases A, B, and C to be inserted therethrough separately.

The separation spring 9 is installed between the notch 8b of the holding plate 8 shown in FIG. 2 and the base 1, and presses the holding plate 8 upward.

The manual handle 10 allows the fixed contact 4 and the movable contact 5 to be brought into contact and separated manually, and is constructed as shown in FIG. 3.

FIG. 3a is a plan view showing one embodiment of the manual handle 10, and as shown in FIG. 3, which is a side view of FIG. 3a, the manual handle 10 has a pin hole 10a. A handle pin 1 is inserted into the pin hole 10a as shown in FIG.
1 is inserted to rotatably support the manual handle 10 on the frame 12.

Frame 12 is shown in FIG.

FIG. 4a is a side view showing one embodiment of the frame 12, and FIG. 4a is a rear view of FIG. 4a.

As shown in FIG. 4, a handle pin 1 is attached to the frame 12.
A hole 12a for supporting 1 is bored.

The first link 13 engages the manual handle 10 and the presser plate 8, and is made of a round bar shaped into a U-shape as shown in FIG.

FIG. 5a is a side view showing one embodiment of the first link 13, and FIG. 5 is a front view of FIG. 5a. It is slidably inserted through the elongated hole 12b of the frame 12 shown in FIG. 4, and rotatably inserted into the hole 10b of the manual handle 1° shown in FIG.

The other end 13b of the first link 13 is slidably engaged with the upper end 8d of the holding plate 8.The handle spring 14 is inserted into the recess 10c of the manual handle 10 shown in FIG. 11, one end is fixed to the frame 12, and the other end is engaged with one end 13a of the first link 13.

The lever 15 is connected to the other end 13b of the first link 13 and the presser plate 8.
The front end of one free end is engaged with the other end 13b of the first link 13, and the other end is connected to the frame shown in FIG. 4 via a lever pin 16. It is rotatably supported by the 12 holes 12c.

The lever spring 17 is wound around the lever pin 16, one end is fixed to the frame 12, and the other end is engaged with the back surface of one end of the lever 16.

The second link 18 is configured by making a round bar into a U-shape, and the end 1
8a is slidably inserted through the elongated hole 12d of the frame 12 shown in FIG. 4, and is slidably engaged with the back surface of one end of the lever 15.

The other end 18b of the second link 18 is rotatably engaged with one end of the automatic removal link 19.

The automatic tripping link 19 is attached to the frame 12 shown in FIG.
It is rotatably supported by a link pin 20 inserted into a hole 12e.

The link spring 21 is wound around the link pin 20, one end of which is fixed to the frame 12, and the other free end engaged with the link 19 for automatic tripping.

The common tripping rod 22 is attached to the other end of the automatic tripping link 19 and is provided to separate the A, B, and C phase movable contacts 5 from the fixed contact 4 at the same time.

The electromagnet 23 with an oil dashpot is attached to the base 1, and includes a pipe 23a with a built-in completely electromagnetic time delay release device, and an electromagnetic coil 23 wound around the pipe 23a.
b, and an L-shaped yoke 23c forming a magnetic circuit.

The movable iron piece 24 engages the electromagnet 23 when the electromagnetic coil 23b is energized.
24a of one end of the movable iron piece 24 engages with the common tripping rod 22.

The spring 25 is installed between the yoke 23c and the other end of the movable iron piece 24, so that one end portion 24b of the movable iron piece 24 is normally engaged with the common tripping rod 22.

The terminal screw 26 is attached to the base 1 and connects an external conductor (not shown) to the terminal plate 27.

One end of the electromagnetic coil 23b is connected to the movable contact conductive plate 6 via a conductor 28, and the other end is connected to the terminal plate 27 via a conductor 29.

The arc extinguishing chamber 3o extinguishes the arc generated when the fixed contact 4 and the movable contact 5 are separated.

The cover 31 covers each component attached to the base 1.

Next, the operation of this invention will be explained using FIGS. 1 and 6.

Now, in FIG. 1, when the manual handle 10 is rotated in the direction of arrow A, one end 13a of the first link 13 moves from the left end of the elongated hole 12b of the frame 12 to the right end.

Therefore, the other end 13b of the first link 13 presses the upper end 8d of the holding plate 8, overcomes the spring force of the separation spring 9, and moves the holding plate 8 downward.

Therefore, the movable contact conductive plate 6 is engaged with and pressed into the inner portion 8c of the hole 8a, and the movable contact conductive plate 6 approaches the fixed contact conductive plate 3.

The movable contact conductive plate 6 connects to the fixed contact conductive plate 3 up to a predetermined distance.
When approaching , the movable contact conductive plate 6 is attracted to the permanent magnet 7 at a high speed.

In this case, by setting the attractive surface of the permanent magnet 7 and the movable contact conductive plate 6 at a low position, the movable contact conductive plate 6 is deformed as shown in FIG. The fixed contact 4 and the movable contact 5 are brought into firm contact with each other at high speed and without the need for mechanical restraint by this deformation pressure, as shown in FIG. 6, and the circuit breaker is turned on.

In this closed state of the circuit breaker, when a short circuit current flows between the fixed contact 4 and the movable contact 5, the short circuit current flows to the electromagnetic coil 23b, and one end portion 24a of the movable iron piece 24 is attracted to the electromagnet 23.

Therefore, the one end portion 24b of the movable iron piece 24 and the common tripping rod 22 engage with each other, and the automatic tripping link 19 is rotated clockwise about the link pin 20.

Due to this rotation, one end 18a of the second link 18 moves upward within the elongated hole 12d of the frame 12, and the second link 1
The one end 18a of the lever 15 is disengaged from the back surface of the one end of the lever 15, and the lever 15 rotates clockwise about the lever pin 16.

Therefore, the other end 13b of the first link 13 falls between the lever 15 and the presser plate 8, and the other end 13b of the first link 13
b is disengaged from the upper end 8b of the presser plate 8, and the presser plate 8 is moved upward by the spring force of the separation spring 9.

Since the movable contact conductive plate 6 is inserted through the hole 8a of the holding plate 8, the movable contact conductive plate 6 moves upward together with the holding plate 8, separating the movable contact 5 from the fixed contact 4. to trip the circuit breaker.

Thereafter, when the manual handle 10 is rotated in the direction opposite to the arrow A in FIG.
One end 13a of the link 13 is connected to the elongated hole 12b of the frame 12.
Move from the right end to the left end.

Further, the other end 13b of the first link 13 also engages with the upper end portion 8b of the presser plate 8 by the action of the lever 15 and the lever pin 17, and returns to the state shown in FIG.

As described above, according to this invention, when the movable contact approaches the fixed contact to a predetermined distance, the permanent magnet attracts the movable contact conductive plate and brings the movable contact and the fixed contact into contact at high speed. .

Therefore, wear and tear on both contacts is reduced, and no welding occurs when both contacts are turned on, allowing use in high-voltage electrical circuits.

In addition, the structure is simple, the assembly work is efficient, and it can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the circuit breaker according to the invention in a tripped state. FIG. 2a is a side view showing one embodiment of the presser plate, and the second
The figure is a top view of FIG. 2a. FIG. 3a is a plan view showing one embodiment of the manual handle, and FIG. 3a is a side view of FIG. 3a. FIG. 4a is a side view showing one embodiment of the frame, and FIG. 4a is a rear view of FIG. 4a. FIG. 5a is a side view showing one embodiment of the first link, and FIG. 5a is a front view. FIG. 6 is an explanatory diagram of the operation of this invention. In the figures, the same parts in each figure are given the same reference numerals, 1 is the base, 4 is the fixed contact, 5 is the movable contact, 6 is the movable contact conductive plate, 7 is the permanent magnet, and 8 is the presser foot. The plate, 8a is a hole, 9 is a release spring, 10 is a manual handle, and 13 is a first link.

Claims (1)

[Scope of utility model registration request] A fixed contact fixed to a base, a movable contact conductive plate with a movable contact opposite to the fixed contact installed at one end and made of a spring material, and the other end of the movable contact conductive plate of the base. a permanent magnet installed on the side of the movable contact conductive plate to bring the fixed contact and the movable contact into contact by attracting the movable contact conductive plate; and a hole through which the movable contact conductive plate is movably inserted in a separating direction. a presser plate having: a separation spring installed between the presser plate and the base to press the presser plate in a direction to separate the fixed contact and the movable contact; a manual handle that is operated when manually moving the contacts into and out of contact; a first link having one end rotatably supported by the manual handle and the other end slidably engaging the upper end of the holding plate; and a circuit breaker comprising a tripping device that disconnects the other end of the first link from the holding plate when an overcurrent flows between the fixed contact and the movable contact. .