JPS5921131B2 - Patshua type gas shield disconnector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a buffer type gas breaker equipped with a suction chamber.

A buffer type gas breaker consists of a pair of separable fixed liquid, a probe and a movable contact in a container filled with arc-extinguishing gas at a single pressure, and is extinguished by the opening action between the movable contacts. It is equipped with a buffer device having a buffer chamber for compressing arc gas.

The current is cut off by spraying compressed arc-extinguishing gas onto the arc between the contacts using this buffer device.

The gas blowing at this time is caused by a pressure difference between the buffer chamber compressed by the buffer device and the inside of the container housing the cutoff section.

Therefore, in order to obtain powerful blowing force, there are methods such as improving the gas flow path structure and increasing the difference between the buffer chamber pressure and the pressure inside the container.

The present invention is a technology related to the latter, in which a suction chamber is formed, in addition to a buffer chamber whose volume is reduced in connection with the contact opening operation, and a suction chamber whose volume is increased in connection with the contact opening operation. The buffer chamber and the suction chamber communicate with each other when the contacts are separated, and the gas flow formed thereby acts on the arc between the contacts.

This utilizes the relative pressure difference between the suction chamber and the buffer chamber to spray gas more effectively and improve the shutoff performance.

Conventional buffer type gas circuit breakers having a suction chamber include those that apply the effect of the suction chamber immediately after the arc contact is disconnected, and those that generate the effect of the suction chamber from midway through the breaker stroke.

The purpose of the former is to greatly shorten the arc time, and the purpose of the latter is to improve the breaking ability and stabilize the performance by the effect of the suction chamber compared to the case without the suction chamber.

The present invention relates to an improvement of the latter of the above two techniques, and is intended to make the effect of the suction chamber more stable and excellent.

FIG. 1 shows a conventional circuit breaker, in which an arc-extinguishing gas is supplied to a pressure P in a container sealed with an insulating tube 1 and end plates 2 and 3 that also serve as electrodes.

A buffer piston 6 supported by a stationary side contactor 4 and a support cylinder 5 is fixedly arranged in the gas space.

When the shaft 7 is driven outward to the right by an operating device (not shown), the movable contact 8, the buffer cylinder 9, and the insulator nozzle 10, which are integrated with the shaft 7, are driven rightward.
Compress the buffer chamber 11.

When the fixed contact 4 and the movable contact 8 are separated, the gas compressed in the buffer chamber 11 passes through the vent 12 and enters the nozzle 1.
The hollow exhaust port 13 of the movable contact 8 is guided by the inner wall of the
The air then flows from the shaft exhaust port 14 to the suction chamber 15 .

At this time, the arc generated between the contacts is extinguished by being blown onto the arc.

After the movable contact 8 has sufficiently completed its breaking stroke, the gas flow passes through a portion of the stroke of the insulator nozzle 10 and is also blown toward the fixed contact, thereby further enhancing the arc extinguishing ability.

The feature of this example is that the catch portion 7a provided on the shaft 7 engages with the suction piston 16 when the shutoff stroke has progressed by a distance L2, and after that, the shaft 7 operates through the same stroke as the movement stroke, and the piston 16 It moves to the right by compressing the push spring 17 that normally pushes it to the left.

This increases the volume of the suction chamber 15, lowers the gas pressure therein, and forms a suction chamber.

The shutoff operation progresses by a stroke L1 and is completed.

The exhaust port 18 is pushed by the suction piston 16 into the pressure spring 17.
It is a device that does not compress the gas in a certain room.

FIG. 2 shows the stroke characteristics and pressure characteristics in the shutoff operation process in the shutoff section of FIG. 1. FIG.

Pressure characteristic P1 indicates the pressure in the buffer chamber, and P2 indicates the gas pressure in the suction chamber without current flowing. After the stroke characteristic, the pressure in the suction chamber decreases and the differential pressure with the buffer chamber increases ( I know what will happen.

However, when an electric current is actually applied to generate an arc, the gas in the suction chamber expands due to the heat of the arc, and as shown in Figure 2, P3, the filling gas pressure P.

It has been experimentally shown that it is higher than

In this case, the differential pressure with the buffer chamber pressure P1 will be smaller than in the case without the suction chamber, resulting in a decrease in performance.

The purpose of the present invention is to suppress the rise in suction chamber pressure due to the above-mentioned arc, to effectively exhibit the effect of the suction chamber from the middle of the breaker stroke, to shorten the arcing time than before, and to increase the breaker capacity to improve its performance. The aim is to provide a sufficiently stable buffer type gas breaker.

The present invention provides that the pressure reduction in the suction chamber is effective for a relatively short period of time, and that hot gas exposed to the arc does not enter the suction chamber at other times; When the pressure in the buffer chamber is sufficiently high, the suction chamber space is communicated with the gas space in the breaker container in a state where sufficient interrupting performance can be achieved even without a drop in the pressure in the suction chamber. .

Therefore, in the best embodiment, the pressure in the suction chamber can be kept as a single pressure and can be prevented from becoming higher than the gas pressure filled in the container, thereby eliminating the conventional drawbacks and improving the shutoff performance.

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

Fig. 3 shows the closed circuit state, Fig. 4 shows the state in the middle of the open circuit and the suction chamber has not yet been formed, Fig. 5 shows the state where the effect of the suction chamber is maximized, and Fig. 6 shows the state just before the end of the breaking stroke. Components equivalent to those in FIG. 1 will be described using the same reference numerals.

The buffer piston 6 is integrally formed with a suction cylinder 19 fixed to a wall of a breaker container (not shown) via a support column 5'.

Therefore, the suction chamber is formed on the open side of the movable contact 8 at a predetermined distance from the buffer chamber, and between the compartments,
There is a gas space which communicates with the gas space in the container entirely contained by the support column 5'.

The suction piston 16 is adapted to be engaged by a pawl 21 provided on the shaft 7, and is placed in the closing position.

An exhaust port 20 is formed in the suction cylinder at a position to be described later, and has a structure that communicates the suction chamber with the gas space in the tank.

As in the conventional case, the circuit opening operation is performed by driving the shaft 7 downward with an operating device (not shown).

This operation compresses the gas in the buffer chamber 11, and when the contacts open, an arc is generated between the fixed contact 4 and the movable contact 8.

In the embodiment disclosed in the present invention, the structure is such that the shaft exhaust port 14 of the communication device is closed with the piston cylindrical portion 23 immediately after opening, thereby suppressing gas outflow at the initial stage of the opening operation.

As the circuit opening operation progresses, in the state shown in FIG. 4, an arc 24 is generated and is blown onto the arc by a gas flow flowing from the buffer chamber to the movable contact hollow part 13, which is a communication device.

However, at this point, the spraying pressure is low (there is not yet enough ability to cut off the current).

However, the high temperature gas after being blown onto the arc is discharged from the shaft exhaust port 14 into the gas space within the tank.

Furthermore, as shown in FIG. 4, during this stroke, the suction piston 16 is in a free sliding state with respect to the shaft.
Its position remains the same as in the closed state.

In order to reliably lock the suction piston 16 in the illustrated position in this state, it is effective to frictionally lock the suction piston 16 to the suction chamber cylinder using a piston ring 22.

Furthermore, the opening stroke progresses, and the shaft 7 is hit or 9
Only when the part 1a and the suction piston 16 engage, the suction screw is driven downwards to form a suction chamber, and immediately after that the shaft outlet 14 enters the suction chamber partitioned by the upper end of the suction cylinder 16. communicates and generates a sudden gas flow.

In the state shown in Fig. 5, a sufficient gas flow is generated even in the stroke part of the insulator nozzle 10, and together with the gas flow directed toward the suction chamber, a very powerful gas blowing is performed. You can expect good cutting performance.

In the state shown in Fig. 6, when the current cutoff is completed and the circuit opening operation is almost completed, the suction piston 16 has exceeded the position 3 of the exhaust port 20 of the suction chamber, and the movable contact has entered the hollow part. The gas flow flows from the shaft exhaust port 14 through the suction chamber cylinder space and from the exhaust port 20 to the tank gas space.

The opening position 3 of the suction chamber exhaust port 20 is preferably located at a position where the buffer chamber pressure is sufficiently high and sufficient ability to interrupt the current is generated only by the differential pressure with the gas pressure in the container housing the breaker. It is determined by the structure and operating characteristics of the vessel.

Together with the suction cylinder 19, it constitutes an opening device.

FIG. 7 shows the stroke characteristics and pressure characteristics for the above stroke.

until the suction piston engages the shaft and operates.
The high-temperature gas that has come into contact with the arc is discharged from the shaft exhaust port into the gas space within the container, so the suction chamber pressure is not thermally affected by the arc at all.

After stroke L2, a suction chamber is formed and the pressure in the suction chamber decreases by 1.
do.

The pressure P3 when the current is cut off is influenced by the bare arc when there is no current (P2), but since the initial part of the opening is discharged into the tank, the pressure P3 in the conventional example shown in Fig. 2 is Small in comparison.

After stroke L3, the suction chamber exhaust port opens, so the suction chamber 1
The pressure is the tank gas pressure P.

is equal to From the above results, it can be seen that in order to shut off only by increasing the pressure in the buffer chamber without a suction chamber, it would have been necessary to increase the pressure to point A in Figure 7, but with the present invention, a pressure difference is created. , the current can be cut off at point B, and the arcing time is shortened.

Furthermore, the current cutting ability increases, the range in which current cutting is possible becomes wider, and stable performance is obtained.

FIG. 8 shows one of the other embodiments, in which the suction piston 16 is pressed by a pressure spring 17 in order to be reliably placed in the illustrated position in the closed state.

This has the effect of ensuring the operation of the suction piston 16.

As explained above, the present invention discharges high-temperature gas flowing from the hollow part of the movable side contactor, which is a communication device, to the shaft exhaust port into the gas space in the tank immediately after opening, and only after stroke L2, the gas flows into the suction chamber. Because of the configuration that generates a flow, the pressure increase in the suction chamber due to the heat of the arc is suppressed, the effect of the suction chamber is large, and a stable breaker with short arc time and excellent interrupting performance can be provided.

A solid contact may be movable as long as the helmet and contact can be relatively opened and separated.

For example, the fixed contact in each embodiment may also be made movable, and the hollow portion thereof may be used as a communication device to similarly constitute a suction device.

Further, the buffer device and the suction device may have any structure as long as either the piston or the cylinder is mechanically connected to the movable contactor as is generally practiced.

[Brief explanation of the drawings] Fig. 1 is a vertical cross-sectional view showing a conventional buffer type gas breaker having a suction chamber, Fig. 2 is a route map showing the operating characteristics of the breaker shown in Fig. 1, and Fig. 3 The figure is a vertical sectional view showing the closing state of one embodiment of the buffer type gas breaker having a suction chamber according to the present invention. FIG. 7 is a longitudinal cross-sectional view illustrating the circuit opening operation of the breaker shown in FIG. 3, and FIG. 8 is a longitudinal cross-sectional view showing another embodiment of the present invention. It is a diagram. 4... Fixed side contactor, 6... Buffer piston, 7
...Shaft, 7a...Hatch portion, 8...Movable side contact, 9...Buffer cylinder, 10...-
Insulator/Zur, 11... Buffer chamber, 12... Ventilation port, 13... Hollow exhaust port, 14... Shaft exhaust port, 15... Suction chamber, 16... Suction piston, 17・
...Press spring, 19...Suction cylinder, 20...Suction chamber exhaust port.

Claims (1)

[Scope of Claims] 1 A container filled with arc-extinguishing gas at a single pressure consists of a pair of separable contacts, a piston and a cylinder, and one of the contacts is connected to a hollow one of the contacts. a buffer device that compresses internal gas by driving approximately in line with the movable contact; and a buffer device that blows gas from the buffer device against the arc generated between the contacts through the hollow part of the movable contact. A buffer type gas breaker comprising a communication device for discharging air, and a suction device consisting of a suction piston and a suction cylinder, one of which is connected to the movable contact after a predetermined stroke thereof to increase the volume inside the suction chamber. , the suction device is configured to be separated from the buffer device by a predetermined side in the opening direction of the movable contact through a gas space opened in the container between the suction device and the communication device; has a shaft exhaust port on the downstream side of the gas in the hollow portion that communicates with the gas space at the beginning of the opening operation of the movable side contact, and then disconnects this communication and communicates with the suction chamber; A buffer type gas breaker, characterized in that when the mouth communicates with the suction chamber, the movable contactor is connected to either a suction piston or a suction cylinder. 2. In the device described in claim 1, the movable contact drive rod is provided with a different diameter portion as a device for operating the suction device after a predetermined stroke due to the opening operation of the movable contact; A buffer type gas breaker in which the different diameter portion and either a suction piston or a suction cylinder forming the suction device are engaged and driven. 3. The buffer type gas breaker according to claim 1, wherein the suction device has an opening device that opens the suction device to the gas space inside the container at a predetermined time after the suction device is activated.