SU788205A2 - Pneumatic device for control of air-break switch - Google Patents

Description

(54) PNEUMATIC DEVICE FOR AIR SWITCH CONTROLS

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This invention relates to high voltage electrical equipment.

According to the main author. St. No. 421057, a pneumatic device for controlling air switches, comprising its compressed air tank, a starting valve, a shut-off valve, a blow valve and a pulsed air duct for shutting off the separator, in which the over-piston shut-off valve is connected to the compressed air tank by a duct, and its sub piston region is known. with a pulsed air duct - a channel closed in the initial position by the starting valve, the shut-off valve being made differential, its stem is provided with an additional A plate with a valve that, when the valve is triggered, closes the opening made for air to escape into the atmosphere from under the piston of the blow valve.

The disadvantage of this device is the leakage of compressed air through the open shut-off valve with a long tripping pulse, which is not economical.

The purpose of the invention is to increase the efficiency of the device.

The goal is achieved by the fact that the device is equipped with a check valve installed in the newly introduced air duct, connecting, separating the internal cavity of the separator column with the piston-shaped area of the shut-off valve and with the piston-producing area of the starting valve.

The drawing schematically shows the proposed device.

The device contains a tank 1 of compressed air, differential valve 2

10 shutdown with a piston 3 and an additional plate 4, which closes the aperture a, made to release air into the atmosphere from under the piston 5 of the blow valve 6, start valve 7, a pulsed air line 8 to shut off the separator, 9 to supply compressed air from a pulsed air line when the starting valve is triggered through channel 10 to the sub piston region of the shut-off valve. Air flow is controlled by a needle 11. An air duct 12 connects a compressed air reservoir to a piston over valve area 2 of the shut-off. When the shut-off valve is triggered, air is supplied to the piston of the blow valve through channel 13,

at the same time, air flows from the tank into the extinguishing chamber of the switch through the support column 14.

The device also contains a blower valve 15 of the separator, a supporting column 16 of the separator, an air line 17, connecting through the check valve 18 a piston region 3 of the shut-off valve 2 with the cavity of the supporting column of the separator through the switch-on unit 19 and an opening 20 to the separator blow valve.

The device works as follows. In the initial position, the entire valve system is in the closed state, while above and below the valve 3 the shut-off valves 2 and under the starting valve 7 the air pressure is balanced because the shut-off valve is differential and equal to the air pressure in the tank 1, which is ensured by the presence of an air duct 12.

When the start valve 7 is actuated, the outlet to the atmosphere for the air below the piston 3 of the shut-off valve 2 opens, and the outlet of the same air into the air duct 17 is blocked by a check valve 18.

Due to the resulting pressure difference above and below the valve 3, the shut-off valve 2 opens, while its additional plate 4 closes the opening a for air to escape into the atmosphere from under the piston 5 of the blower valve 6. Compressed air from tank 1 comes through duct 12 and acts on the piston 5 of the blow valve 6.

After the blower valve 6 has been activated, the compressed air from the tank 1 flows through the supporting column 14 into the extinguishing chamber. At the same time, part of the compressed air through the pulse duct 8 affects the development of the blower valve 15 of the separator, as a result of which compressed air from the tank 1 begins to flow into the separator through its supporting column 16. At the same time, part of the compressed air enters the air duct 17.

Pneumatic air cut-off is as follows. When air enters the pulse air line 8 to shut off the separator, at the same time the air through the channels 9 and 10 begins to flow under the piston 3 of the shut-off valve 2. The pressure above and below pressure 3 is equalized, the shut-off valve returns to its original position, opening a hole for air to escape to the atmosphere from under the piston 5 of the blowing valve 6, as a result of which the valve 6 also returns to its original position, stopping the access of compressed air to the damping chamber .

If at the end of the shutdown operation the shut-off impulse (pneumatic or electric) is preserved, then compressed air from the separator support column 16 through the air duct 17 through the check valve 18 will flow under the piston 3 of the shutdown valve 2, affecting its closure regardless of the position of the starting valve 7 and providing a one-time shutdown operation independently

on the duration of the tripping pulse. At the same time, the check valve 18 blocks the air pipe 10, preventing the leakage of compressed air through the open starting valve 7. The moment of closing the shut-off valve and, accordingly, the air flow at

the shutdown is controlled by throttling the channel 9 with a washer or an adjusting needle 11.

Claims (1)

Invention Formula Pneumatic device for controlling air switches St. No. 421057, characterized in that, in order to improve the efficiency of the device, it is provided with a check valve installed in the newly introduced air duct connecting the internal cavity of the separator column to the sub-piston area of the shut-off valve and to the subarm area of the starting valve. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 421057, cl. H 01 H 3/24, 10.12.71.