JPS5813565Y2 - Suction puffer type switch - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a suction buffer type switch.

FIG. 1 shows a conventional suction buffer type switch in the cut-off position.

In the figure, 1 is a cylindrical cylinder that also serves as a shield.
2 is a piston slidably inserted into the suction chamber 3 in the cylinder 1; 4 is a gasket provided on the outer periphery of the piston 2; 5 is an integrally connected inner surface of the piston 2; A movable contact passing through the center,
6' is a suction contact formed at the center of the movable contact 5.
The exhaust port 7 is a communication port that communicates the suction chamber 3 with the suction/exhaust port 6 at the base of the movable contact 5.

8 fixes the tip to the center of the outer surface of the piston 2 and attaches it to the piston 2.
and an insulated operating rod for operating the movable contact 5; 9 is a contact stand disposed near the tip of the suction chamber 3, the outer periphery of which is hermetically connected to the inner surface of the cylinder 1, and the movable contact 5 penetrates through the center; 10 is a contact stand; A gasket attached to the inner periphery of the contact frame 9 and allowing the movable contact 5 to pass through it in an airtight manner; 11 is a contact chamber formed at the tip of the cylinder 1 by partitioning the contact frame 9'; 12 is a contact chamber 11 A sliding contact 13 disposed on the outer periphery of the movable contact 5 and supported by the contact frame 9 is fitted onto the outer periphery of the sliding contact 12 and tightened to contact the movable contact 5. It's a spring.

In such a suction buffer type switch, the piston 2 and the movable contact 5 are moved upward in the drawing by an insulated operating rod 8 connected to an operating mechanism (not shown).

Since the cylinder 1 is fixed, the waste in the suction chamber 3 is pushed out by the piston 2 and blown out from the tip of the movable contact 5.

In this state, the movable contact 5 is inserted.

Conversely, when the piston 2 and movable contact 5 retreat by being pulled by the insulated operating rod 8, the volume inside the suction chamber 3 increases, and as the volume of the suction chamber 3 increases, gas flows from the tip of the movable contact 5 into the suction chamber 3. The cutoff operation is performed while being sucked into the interior.

Such a suction buffer type switch has inferior arc extinguishing ability and tends to take a longer arc time than a blowout buffer type switch.

As the arc time increases, impurity particles formed from metal particles and the like tend to increase, and these impurity particles are sucked into the cylinder 1 during the suction operation and are blown out between the contacts during the next closing operation.

This is very unfavorable in terms of insulation.

To improve this, recently, a movable contact is provided with a plurality of first communication ports for communicating the suction port and the suction chamber, and these first communication ports prevent backflow from the suction chamber to the suction port. A plurality of second communication ports are provided on the piston for communicating between the suction chamber and the outside of the cylinder, and these second communication ports are provided with a first check valve that communicates with the outside of the cylinder. A suction buffer type switch has been proposed in which a second check valve is provided to prevent backflow to the suction chamber, and a filter is provided at each communication port of the joint 2.

According to such a suction buffer type switch, the gas flow can be regulated in a certain direction, and gas blowing and suction can be performed in separate places (7). A large amount of impurity particles can be passed through, so that impurity particles will not be blown out between the contacts during the next closing operation.

However, in such a structure, two or more check valves must be attached to the movable part, which increases the weight of the movable part and requires a large operating force, making it unsuitable for high-speed operation.

In this type of structure, each check valve is operated by the differential pressure of the gas and the spring pressure of the return spring, so the valve may stop opening or closing in an intermediate state, reducing reliability and reliability. It had the disadvantage of being inferior.

An object of the present invention is to provide a suction buffer type switch that can prevent impurity particles from blowing out, reduce the weight of the moving parts, and improve the reliability and reliability of the check valve operation.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 2, in the suction buffer type switch of this embodiment, the hole of the movable contact 5 is used as a dedicated suction port 6, and the base of the movable contact 5 is provided with a communication lower communicating with the suction chamber 3. In addition, a common check valve 25 is provided spanning the base of the movable contact 5 and the tip of the insulated operating rod 8.

That is, this common check valve 25 has a valve seat 1 provided on the inner periphery of the movable contact 5 between the suction port 6 and the communication lower part.
5, a stopper portion 14 provided at a predetermined distance from the valve seat 15 on the side opposite to the valve seat 15 with the communication lower in between, and a stopper portion 14 provided at the tip of the insulated operating rod 8. The movable contact 5 is slidably and movably inserted into the base of the movable contact 5 and contacts the valve seat 15 to cut off the connection between the suction port 6 and the communication lower, and the stopper part 14 contacts the suction port 6. The valve body 26 is located at a position that allows communication between the lower part and the lower part.

The valve body 26 is provided with an exhaust port 18 so that the communicating lower communicates with the outside of the cylinder 1 when the valve body 26 is in contact with the valve seat 15.

A filter 19 is fitted into the outlet side of the exhaust port 18.

A backing 2 is provided at the portion where the valve body 26 passes through the piston 2.
There are 7.

In such a suction buffer type switch, when the insulated operating rod 8 is advanced when the insulated operating rod 8 is turned on, the valve body 26 integrated therewith first advances and hits the valve seat 15, and the suction port 6 and the communication port are cut off. In addition, the suction chamber 3 is communicated with the outside of the cylinder 1 via a lower communication portion and an exhaust port 18 .

When the valve body 25 comes into contact with the valve seat 15, the cylinder 2 and the movable contact 5 are then pushed forward by the insulated operating rod 8.
The switch is closed.

At this time, since the suction port 6 is closed by the valve body 26, no gas is blown out from the suction port 6.

As the gas in the suction chamber 3 is compressed by the piston 2, it passes through the communication port γ, the exhaust port 18, and the filter 19, and is discharged to the insulated operating rod 8 side.

At the time of shutoff, when the insulated operating rod 8 is retreated, the valve body 26 integrated therewith first retreats, and the tip side of the valve body 26 hits the stopper part 14, and the suction port 6 and the communication lower are communicated. In addition, communication between the suction chamber 3 and the exhaust port 18 is cut off.

When the front end side of the valve body 26 hits the stopper part 14, the cylinder 2 and the movable contact 5 are then pulled back by the insulated operating rod 8 and the switch is shut off.

At this time, gas is sucked into the suction chamber 3 through the suction port 6, and the arc is extinguished.

As explained above, according to the suction buffer type switch according to the present invention, since a common check valve is provided across the base of the movable contact and the insulated operating rod, only one check valve is required. This has the advantage of reducing the weight of the moving parts, making it suitable for high-speed operation and contributing to reducing operating force.

Further, according to the present invention, since the check valve is operated with an insulated operating rod, a return spring is not required.

Therefore, the opening or closing degree of the valve does not stop at an intermediate state, but operates at either the fully open or fully open position, which is much more reliable than operation based on pressure difference and return spring. and reliability can be improved.

Further, according to the present invention, there is an advantage that the structure is simple regardless of the provision of a check valve.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional suction buffer type switch, and FIG. 2 is a longitudinal sectional view of an embodiment of the suction buffer type switch according to the present invention. 1... Cylinder, 2... Piston, 3... Suction chamber, 5... Movable contact, 6... Suction port, 7...
・Communication port, 8... Insulated operating rod, 12... Sliding contact, 14... Part of stopper, 15... Valve seat, 18
...Exhaust port, 19...Filter, 25...Check valve, 26...Valve body.

Claims (1)

[Scope of utility model registration request] A cylinder having a suction chamber, a piston sliding inside the cylinder, a movable contact integrally supported by the piston with a suction port opening at the tip communicating with the suction chamber, and an insulated operating rod for operating the piston. A communication port that communicates the suction port and the suction chamber, and a valve seat provided on the inner periphery of the movable contact between the suction port and the communication port; A part of a stopper is provided at a predetermined distance from the valve seat on the side opposite to the valve seat with the communication port in between, and a stopper provided at the tip of the insulated operating rod is used to control the movable contact. The valve is slidably inserted into the base and comes into contact with the valve seat and is connected between the suction port and the communication port.
and a position where the valve body contacts a part of the stopper to establish communication between the suction port and the communication port, and the valve body is in contact with the valve seat and the communication port is in the position of the valve seat. A suction buffer type switch comprising: an exhaust port formed in the valve body so as to communicate with the outside of the cylinder; and a filter disposed in the exhaust port.