JPH069425Y2 - Gas circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a gas circuit breaker for extinguishing a gas by blowing gas to an arc generated when the circuit is opened.

[Prior Art] A gas circuit breaker drives a relative displacement to contact female and male contacts that are separated from each other, and an arc that is generated when the contacts are separated from each other. And a nozzle for spraying an extinguishing gas.

In this type of circuit breaker, either a female contactor or a male contactor is arranged in the nozzle so that when the circuit is opened, the extinguishing gas is blown to the arc through the gas passage between the contactor and the nozzle. It has become.

As shown in FIG. 3, the female contactor 1 used in this type of circuit breaker has a large number of elastic contactor pieces 102, 102, ... Shaped contacts, each contact piece 102
Contact part 103 for bringing the male contactor 2 into contact with the tip of the
Are formed.

When the female contact 1 is arranged inside the nozzle 3 as shown in FIG. 3, in order to prevent the gas G flowing through the inside of the nozzle 3 from leaking to the inside of the female contact 1, A gas leakage prevention sleeve 5 is fitted on the outside of the contact 1.

[Problems to be Solved by the Invention] In the conventional circuit breaker described above, the gap between the sleeve 5 and the female contactor 1 is configured to be as small as possible in order to prevent gas leakage.

On the other hand, in order to maintain a good contact state between the female contact and the male contact, the inner diameter d of the female contact 1 is set smaller than the outer diameter D of the fixed contact 2 as shown in FIG. Therefore, when the male contactor is engaged and brought into contact with the female contactor, the sleeve acts as a fastening ring of the female contactor, and the throwing force of the circuit breaker increases. According to actual measurement, when the sleeve acting as the fastening ring is provided, the throwing force of the circuit breaker becomes about three times as large as that in the case where the sleeve is not provided. Generally, the sleeve is made of a heat-resistant material (for example, Teflon), but because of its large coefficient of thermal expansion, the sleeve acts as a fastening ring at low temperature (winter season), and when measured, it becomes -10 ° C. It requires about twice as much input power as at + 17 ° C. In this case, for the entire three phases, the throwing power is 3 × 2 × 3 = 18 times as large as when the sleeve is not provided, and a large-sized one having a large throwing power is required as an operating device.

Therefore, it is conceivable to form a gap between the sleeve 5 and the female contact 1, but if a gap is formed between them,
At the time of interruption, the arc blowout gas flows into the inside of the female contactor 1 through the gap and the interruption slit 101 of the female contactor, which causes a problem that the interruption performance deteriorates.

An object of the present invention is to provide a gas circuit breaker capable of reducing throwing power without lowering the breaking performance.

[Means for Solving the Problems] The present invention relates to a nozzle for spraying an extinguishing gas, and a female contactor having a plurality of contact pieces arranged in an annular shape and arranged inside the nozzle. A male contact for contacting with and separating from the female contact, and arranged outside the female contact to prevent gas blown into the arc through the inside of the nozzle from leaking to the inside of the female contact. A gas circuit breaker provided with a gas leakage prevention sleeve is provided to reduce throwing power without impairing the breaking performance.

Therefore, in the present invention, a space is provided between the female contactor and the sleeve to prevent the female contactor from being restrained by the sleeve when the male contactor is engaged with the female contactor. A bulging portion protruding outward is formed at the tip of each contact piece of the female contactor, and the bulging portion substantially closes the opening at the tip of the sleeve.

[Operation of the Invention] When the gap is formed between the sleeve and the female contactor as described above, the sleeve acts as a fastening ring when the male contactor is brought into contact with the female contactor. Since there is no input, it is possible to significantly reduce the input power. Further, as described above, when a bulge portion is formed at the tip of each contact piece of the female contact piece and the bulge portion is used to close the gap between the sleeve and the female contact piece, Since almost no gas flows into the inside of the female contactor, it is possible to prevent the blocking performance from being deteriorated. Therefore, according to the present invention, the throwing power can be reduced without deteriorating the breaking performance.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention. The left half of the drawing shows a shut-off state and the right half shows a closed state. In FIG. 1, reference numeral 10 denotes a current collector made of a conductive material and fixed to a container of a circuit breaker (not shown), and 11 denotes a piston screwed to an end of the current collector 10. A sliding rod 12 made of a conductive material is provided so as to slidably pass through the center of the piston 11, and a cylindrical coupling 13 is screwed to the rear end of the sliding rod. A sliding ring 14 that slides on the inner peripheral surface of the current collector 10 is fitted to the outer circumference of the coupling 13, and an insulating operation rod 15 is fitted to the inner circumference of the coupling, respectively, to form a coupling with the sliding ring 14. 13 and the insulating operating rod 15 are connected by a pin 16. A sliding contact 17 that comes into contact with the sliding rod 12 is attached to the tip of the current collecting cylinder 10.
The sliding rod 12 and the collector cylinder 10 are electrically connected by 7.

A female contact 20 that constitutes a movable arc contact is attached to the tip of the sliding rod 12, and a gas leakage preventing sleeve 21 is attached to the outside of the female contact 20.

As shown in FIG. 2, a female contactor 20 is a cylinder in which a large number (six in this embodiment) of contactor pieces 20a having a contact portion 20a1 at the tip thereof are equally divided in an annular shape through interrupt slits 20b. -Shaped contactor main part 20A and this contactor main part 20A
It is composed of a neck portion 20B integrally provided at the rear end portion. A screw is provided on the outer periphery of the neck portion 20B, and this screw is screwed into a screw formed on the inner periphery of the tip portion of the sliding rod 12 to connect the female contact 20 and the sliding rod 12.

The sleeve 21 has an inner diameter larger than the outer diameter of the contactor main portion 20A of the female contactor 20, and an annular gap 22 is formed between the inner periphery of the sleeve 21 and the outer periphery of the female contactor 20. . The size t of this gap 22 is large enough to prevent the sleeve 21 from restraining the female contact 20 when the male contact to be described later is engaged with the female contact 20. Is set to.

Each contact piece 20a of the female contact piece 20 is provided with a bulge portion 20c protruding outward at the tip end portion thereof. Each bulge 20
c has a flat surface 20c1 that abuts on the tip surface of the sleeve 21, and the flat surface 20c1 abuts on the tip surface of the sleeve 21 so that the open end of the gap 22 between the sleeve 21 and the female contact 20 is provided. Is blocked.

The nozzle 2 surrounding the female contact 20 is provided at the tip of the sliding rod 12.
5 and a cylinder 26 fitted to the outer periphery of the piston 11 are attached, and the nozzle 25 and the cylinder 26 are attached to the sliding rod 12.
Along with it, it is designed to be displaced in the axial direction. In this example, the outer circumference of the tip of the cylinder 26 is the main movable contact 27.
Are configured.

A movable side element I is constituted by the above-mentioned respective parts, and a fixed side element II which constitutes a blocking part together with the movable side element is arranged on the tip end side of the nozzle 25.

The fixed-side element II has a conductive tube 30 also serving as a shield,
A male contact 32 having a tubular shape, one end of which is fixed to a contact holding portion 31 provided inside the conductive tube, and a main fixed contact 33, which is held on the inner circumference of the conductive tube 30, are provided. The child 32 constitutes a fixed arc contact.

Although not shown, external terminals electrically connected to the collector cylinder 10 and the conductive cylinder 30 are provided, and both external terminals are connected to an external circuit.

In the above embodiment, the main movable contact 27 contacts the main fixed contact 33 after the female contactor (movable arc contact) 20 contacts the male contactor (fixed arc contact) 32 at the time of closing, and shuts off. In such a case, the positions of the contacts are arranged so that the movable female contact (movable arc contact) 20 is separated from the male contact (fixed arc contact) after the main movable contact 27 is separated from the main fixed contact 33. Has been defined.

The breaker composed of the movable element I and the fixed element II is housed in an insulating container filled with high-pressure SF ₆ gas, and the insulating operating rod 15 is connected to the circuit breaker operating device through an appropriate connecting mechanism.

In the closed state shown in the right half of FIG. 1, the fixed side current collecting tube 3
An electric current flows through the path of 0-main fixed contact 33-sliding rod 12-sliding contact 17-movable side collector 10. In this state, when a cutoff command is given, the insulating operating rod 15 is driven downward in FIG. 1 and the sliding rod 12 is displaced downward. As a result, the main movable contact 27 first separates from the main fixed contact 33, and then the female contact (movable arc contact) 20 separates from the male contact (fixed arc contact) 32. When the arc contact is separated, an arc is generated between the two, but the cylinder 26 is displaced toward the piston 11 side as the sliding rod 12 is displaced, and the volume in the cylinder is reduced.
₆ Gas is sprayed on the arc, and the arc is extinguished by spraying this gas.

In the circuit breaker described above, since the inner diameter d of the female contactor 20 is set smaller than the outer diameter D of the male contactor 32,
When the male contactor 32 is engaged with the female contactor 20, the contactor pieces 20a of the female contactor 20 are spread outward, and the outer diameter of the female contactor is enlarged. Since the inner diameter of the sleeve 21 is set to be large so that the sleeve does not work as a fastening ring when the outer diameter of the female contact 20 is enlarged at the time of insertion, the throwing force does not increase, Moreover, the throwing power does not increase even at low temperatures. Moreover, since the gap between the sleeve and the female contactor is closed by the bulging portion 20c provided at the tip of each contactor piece 20a,
It is possible to prevent the gas from flowing into the inside of the female contactor through the gap between the sleeve and the female contactor at the time of shutoff, thereby preventing the deterioration of the blocking performance.

[Effect of the Invention] As described above, according to the present invention, the sleeve serves as a fastening ring when the male contact is brought into contact with the female contact by forming a gap between the sleeve and the female contact. Since it has no effect, it is possible to significantly reduce the throwing power. In addition, a bulge is formed at the tip of each contact piece of the female contactor, and the bulging portion closes the gap between the sleeve and the female contactor. The gas that flows into the inside of the child can be almost eliminated, and the blocking performance can be prevented from deteriorating. Therefore, according to the present invention, there is an advantage that the throwing power can be reduced without deteriorating the breaking performance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing an essential part of the embodiment shown in FIG. 1, and FIG. 3 is a sectional view showing an essential part of a conventional circuit breaker. FIG. 4 is an explanatory view showing a state in which a male contactor is brought into contact with a female contactor in a conventional circuit breaker. 10 ... Current collecting cylinder, 11 ... Piston, 12 ... Sliding rod, 17 ...
Current collecting contact, 20 ... Female contactor, 21 ... Sleeve,
22 ... Gap, 25 ... Nozzle, 27 ... Main movable contact,
26 ... Cylinder, 32 ... Male contactor, 33 ... Main fixed contact.

Claims (1)

[Scope of utility model registration request] 1. An arc-extinguishing gas blowing nozzle, a female contactor disposed inside the nozzle having a plurality of contactor pieces arranged in an annular shape, and contacting and separating from the female contactor. A male contactor, and a gas leakage prevention sleeve disposed outside the female contactor to prevent gas blown to the arc through the inside of the nozzle from leaking to the inside of the female contactor. In a gas circuit breaker provided with the female contactor, the male contactor is prevented from being restrained by the sleeve while the male contactor is engaged with the female contactor between the female contactor and the sleeve. And a bulging portion projecting outward is formed at the tip of the contact piece, and the bulging portion is arranged so as to substantially close the opening at the tip of the sleeve. And a gas circuit breaker.