JPH09312121A - Puffer gas-blast circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the operational force and manufacture an operation apparatus with a miniaturized size at low cost by compressing the puffer chamber by electromagnetic force. SOLUTION: A movable contactor 20 of a puffer gas-blast circuit breaker comprises a movable main contactor 21 and a movable arc contactor 22 and is joined to an operation apparatus. On the other hand, of a fixed contactor part 23, a fixed contactor 25, a fixed arc contactor 26, and an insulated nozzle 27 are installed in the tip end part of a puffer cylinder 28 composing a puffer chamber 29. To compress a sealed arc extinguishing gas, a floating piston 30 which can slide and have a contact with the puffer chamber 29 is inserted into the puffer chamber 29. Moreover, a part of the inner circumferential part of the puffer cylinder 28 is made of a insulating part 31 and the rest is made of a conductive material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a puffer type gas circuit breaker, and more particularly to a puffer type gas circuit breaker with reduced operating force.

[0002]

2. Description of the Related Art A conventional puffer type gas circuit breaker will be described with reference to FIG. As shown in the figure, the fixed contact portion 1
Is composed of a fixed arc contactor 3 and a fixed main contactor 2 located on the outer periphery thereof, and the movable contactor portion 4 includes a movable contactor 6 and an insulating nozzle 7 and a movable main contactor located on the outer periphery thereof. It is composed of 5, etc.

In the closed state of the circuit breaker, the movable arc contact 6 is in contact with the fixed arc contact 3 and the movable main contact 5 is in contact with the fixed main contact 2 as shown in FIG. . Further, the movable contactor portion 4 is formed integrally with the operation rod 9 and the puffer cylinder 8 provided on the outer peripheral side thereof,
The operation rod 9 is connected to an operation mechanism section (not shown). Inside the puffer cylinder 8, the puffer piston 1
0 is movably provided, and the puffer cylinder 8 and the puffer piston 10 form a puffer chamber 11. An opening 13 is formed at the end of the puffer chamber 11 so as to communicate with the arc position between the arc contacts 3 and 6.

Now, when a cutoff command is issued, an operating mechanism section (not shown) operates to move the operating rod 9 to the right in FIG. When the operation rod 9 moves, the movable contactor portion 4 moves in a direction away from the fixed contactor portion 1, and the opening contact breaking operation starts. When the movable contactor portion 4 moves, the fixed main contactor 2 and the movable main contactor 5 are first separated, and then the fixed arc contactor 3 and the movable arc contactor 6 are separated from each other. At this time, when the arc 12 is generated between the arc contacts 3 and 6, the state in which the current is not interrupted continues.

However, since the puffer piston 10 is integrated with the fixed part (not shown), the volume of the puffer chamber 11 gradually decreases when the movable contact part 4 moves. As a result, the arc-extinguishing gas is compressed in the puffer chamber 11 and the pressure rises, and the gas flows out from the opening 13 as a gas flow 14 as shown by the arrow in FIG. The gas flow 14 is blown to the arc 12 by the insulating nozzle 7 as a guide to extinguish the arc.

[0006]

In the conventional puffer type gas circuit breaker described above, if the operating force of the operating mechanism is sufficient,
It operates well and has the ability to cut off current within the cutoff time, but generally requires a large operating force. In particular, due to the recent increase in the breaking current, the puffer cylinder is becoming larger, and the transient pressure increase in the puffer chamber causes an increase in the reaction force that hinders the compression operation, resulting in a larger operating force. At the same time, costs tend to increase. The present invention has been made in view of the above circumstances, and an object thereof is to provide a low-cost puffer-type gas circuit breaker with reduced operating force.

[0007]

In order to achieve the above-mentioned object, the first aspect of the present invention comprises a current-carrying contact, an arc contactor and the like in a container in which an arc extinguishing gas is sealed, and they are arranged opposite to each other. It has a pair of contact portions, at least one of the contact portions is connected to the operation mechanism portion, the other contact portion is provided with a puffer chamber for compressing the arc-extinguishing gas, and the compressed arc-extinguishing gas is supplied. In a puffer-type gas circuit breaker equipped with a blowing gas flow path composed of an insulating nozzle that blows at an arc position, a large diameter cylinder, a small diameter cylinder concentric with the large diameter cylinder, and a cylinder center at the contactor side tip of both cylinders. A puffer chamber is composed of a flange installed perpendicular to the axis, and a floating piston is provided in sliding contact with the large-diameter cylindrical inner diameter portion and the small-diameter cylindrical outer diameter portion, and the flange is provided with an arc contactor, an insulating nozzle, and a puffer. Room The large diameter cylinder, the flange and the floating piston are made of a conductive material, and the small diameter cylinder is made of an insulating material for a part of the flange side, and the rest is made of a conductive material. In the breaking operation, the arc contactor, the flange, the large-diameter cylinder, the floating piston, and the small-diameter cylinder form a current path for the breaking current in this order, and the energizing current of the floating piston is in the radial direction with respect to the central axis. It is characterized in that the magnetic field generated by the energizing current of the small diameter cylinder is rotated in the direction of rotation with respect to the central axis.

According to a second aspect of the present invention, a container having an arc-extinguishing gas sealed therein is provided with a pair of contact portions which are composed of a current-carrying contactor and an arc contactor, and which are arranged to face each other. The child part is connected to the operating mechanism part, the other contact part is provided with a puffer chamber for compressing the arc-extinguishing gas, and a blowing gas composed of an insulating nozzle for blowing the compressed arc-extinguishing gas to the arc position. In a puffer type gas circuit breaker provided with a flow path, a puffer chamber is constituted by a large-diameter cylinder, a small-diameter cylinder concentric with the large-diameter cylinder, and a flange connected to both the cylinders and installed perpendicularly to the cylinder central axis, A floating piston in sliding contact with the large-diameter cylindrical inner diameter portion and the small-diameter cylindrical outer diameter portion is provided to electrically connect the small-diameter cylindrical tip and the arc contactor to the gas flow path from the flange side inside the puffer chamber. All the way through Provided the road, further the large-diameter cylinder,
The small-diameter cylinder and the floating piston are made of a conductive material, the flange is made of an insulating material, and at the time of the breaking operation, the arc contactor, the small-diameter cylinder, the floating piston, and the large-diameter cylinder form a current path for the breaking current in this order. Further, the current flowing through the floating piston is radial with respect to the central axis, and the magnetic field for generating the current flowing through the small diameter cylinder is rotational with respect to the central axis.

According to a third aspect of the present invention, in the puffer type gas circuit breaker according to the first or second aspect, the inner diameter portion of the large diameter cylinder and the outer diameter portion of the small diameter cylinder are in sliding contact with each other and are made of this insulating material. A plurality of parallel ring-shaped discs,
A plurality of ring-shaped discs are connected by a plurality of rods, etc., and a conductive fluid is filled in a sealed closed space composed of a plurality of ring-shaped discs, a large diameter cylindrical inner diameter portion and a small diameter cylindrical outer diameter portion,
The floating piston is composed of a ring-shaped disc and a conductive fluid.

[0010] Claim 4 of the present invention is Claim 1, Claim 2
Alternatively, in the puffer type gas circuit breaker according to claim 3,
An elastic member such as a spring that connects the floating piston and the flange is provided, and the elastic member has a natural length in a closed state and is configured to urge the floating piston in a direction opposite to the compression direction during a compression operation. Characterize.

According to a fifth aspect of the present invention, in the puffer type gas circuit breaker according to the first aspect, the second aspect, the third aspect or the fourth aspect, the insulating nozzle is connected to a contact side of the floating piston, The floating piston and the insulating nozzle are integrally operated.

According to a sixth aspect of the present invention, in the puffer type gas circuit breaker according to the first, second, third, fourth or fifth aspect, the contactor portion facing the puffer chamber is the above-mentioned. The energizing contact is directly connected to the operation mechanism section, the arc contact is connected to the energizing contact through the link mechanism, and the operation start of the arc contactor is the energizing contact at the initial stage of the breaking operation and the closing operation. A play is provided at a connecting portion between the arc contactor and the link mechanism so that the start of operation of the child is delayed.

According to a seventh aspect of the present invention, in the puffer type gas circuit breaker according to the first, second, third, fourth, fifth or sixth aspect, the contactor including the puffer chamber is provided. Is integrally connected to the operation mechanism section,
It is characterized in that it is driven during the breaking operation.

According to claim 8 of the present invention, in the puffer type gas circuit breaker according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6 or claim 7, the puffer chamber is provided. And a pressure accumulating chamber that communicates with the gas flow path and is surrounded by the large-diameter cylinder and the small-diameter cylinder.

A ninth aspect of the present invention is the puffer type gas circuit breaker according to the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, the sixth aspect, the seventh aspect or the eighth aspect. In the initial stage of the shutoff operation, a vent passage is provided so that the puffer chamber communicates with the arc generation position.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B show a puffer type gas circuit breaker according to a first embodiment (corresponding to claim 1) of the present invention. FIG. 1A is a sectional view in a closed state, and FIG. 1B is a sectional view in a latter stage of the breaking operation. It is a figure.

In FIG. 1, the movable contactor portion 20 is composed of a movable main contactor 21 and a movable arc contactor 22 and is connected to an operating device (not shown). In addition, the fixed contactor portion 23 has a fixed main contactor 25, a fixed arc contactor 26, and an insulating nozzle 27 on a flange 24 installed at the tip of a puffer cylinder 28 forming a puffer chamber 29 perpendicular to the cylinder center axis. Is attached. A floating piston 30 capable of sliding contact with the puffer chamber 29 is inserted into the puffer chamber 29. Further, a part of the inner peripheral portion of the puffer cylinder 28 is made of an insulator 31.

Next, the blocking action of this embodiment will be described. When a disconnection command is issued, an operating mechanism section (not shown) operates to move the movable contactor section 20 to the left in the drawing, and the opening contact breaking operation starts. When the movable contact portion 20 moves, the fixed main contact 25 and the movable main contact 21 are first separated, and then the fixed arc contact 26 and the movable arc contact 22 are separated.
At this time, when the arc 32 is generated between the arc contacts 26 and 22, the state in which the current is not interrupted continues. The breaking current flows through the current paths 33 and 34. Current path 34
The current flowing in the direction of the central axis generates a magnetic field 35 at the position of the floating piston 30, and as a result, an electromagnetic force 36 acts on the floating piston 30. When the floating piston 30 moves, the volume of the puffer chamber 29 gradually decreases. As a result, the arc extinguishing gas is compressed in the puffer chamber 29 and the pressure rises, and the gas flows 38 and 39 flow out from the opening 37 as shown by the arrow. The gas flow 39 is sprayed on the arc 32 with the insulating nozzle 27 as a guide.

In this embodiment, since a magnetic field acts on a large breaking current, a strong electromagnetic force can be obtained. In addition,
The direction of electromagnetic force is always constant regardless of the polarity of current. The effects of this embodiment described above are summarized as follows. That is, (1) since the puffer chamber is compressed by electromagnetic force, the energy required for operation is limited to the energy for driving the movable main contactor and the movable arc contactor, and it is possible to reduce the operating force. The operating device can be made small and inexpensive.

(2) Since the compression of the puffer chamber is performed by the electromagnetic force, the larger the breaking current, the stronger the electromagnetic force, that is, the compression force can be obtained, and the higher the pressure rise can be obtained. (3) When the breaking current is small, the compressive force becomes weak and the pressure rise becomes relatively low, so it is possible to reduce the rise in gas flux near the arc contactor and the accompanying decrease in density. Insulation recovery is obtained.

2A and 2B show a puffer type gas circuit breaker according to a second embodiment of the present invention (corresponding to claim 2). FIG. 2A is a sectional view in the closed state, and FIG. It is a sectional view of the state, and the basic configuration is the same as that of the first embodiment of FIG. 1 already described.

In the figure, the movable contactor section 20 is composed of a movable main contactor 21 and a movable arc contactor 22 and is connected to an operating device (not shown). Further, in the fixed contactor portion 23, a fixed main contactor 25 and a fixed arc contactor 26 are attached to a tip end portion of a puffer cylinder 28 forming a puffer chamber 29. An insulator 31 is inserted in the puffer cylinder 28, and the insulator 3
Insulation nozzle 27 is attached to 1 and puffer chamber 29
Is composed. In the puffer room 29, the puffer room 2
A floating piston 30, which is capable of sliding contact with 9, is inserted. Further, the stopper 4 is provided on the inner surface of the puffer cylinder 28.
1 is attached.

Next, the blocking action of this embodiment will be described. When the movable contact portion 20 is moved to the left in the figure during the breaking operation, an arc 32 is generated between the arc contacts 22 and 26. At this time, the breaking current flows through the current paths 33 and 34. Of the currents flowing through the current path 34, the current in the central axis direction generates a magnetic field 35 at the position of the floating piston 30, and as a result, an electromagnetic force 36 acts on the floating piston 30.
As the floating piston 30 moves, it compresses the puffer chamber 29, resulting in compressed gas exiting the openings 37 and 40 as gas streams 38 and 39 and sprayed onto the arc 32.

As described above, in this embodiment, a strong electromagnetic force can be obtained because the magnetic field acts on a large breaking current. Also, the magnitude of electromagnetic force depends on the magnitude of current,
It does not depend on the position of the floating piston.

This embodiment has the same effects as the first embodiment of FIG. 1, but in this embodiment the magnetic field generated at the floating piston position is of a magnitude that is almost neglected except for the above. Therefore, whatever the position of the floating piston, an electromagnetic force that depends only on the magnitude of the current is obtained.

3A and 3B show a puffer type gas circuit breaker according to a third embodiment of the present invention (corresponding to claim 3). FIG. 3A is a sectional view in the closed state, and FIG. It is a sectional view of the state, and the basic configuration is the same as that of the first embodiment of FIG. 1 already described.

In the figure, the movable contactor portion 20 is composed of a movable main contactor 21 and a movable arc contactor 22 and is connected to an operating device (not shown). In addition, the fixed contactor portion 23 has a fixed main contactor 25, a fixed arc contactor 26, and an insulating nozzle 27 on a flange 24 installed at the tip of a puffer cylinder 28 forming a puffer chamber 29 perpendicular to the cylinder center axis. Is attached. A floating piston 30 capable of sliding contact with the puffer chamber 29 is inserted into the puffer chamber 29. Floating piston 30
Is provided with a conductive fluid 42 and an insulating partition wall 43 that seals it. A part of the puffer cylinder 28 is made of an insulator 31.

Next, the blocking action of this embodiment will be described. When the movable contact portion 20 is moved to the left in the figure during the breaking operation, an arc 32 is generated between the arc contacts 22 and 26. At this time, the breaking current flows through the current paths 33 and 34. Further, among the currents flowing through the current path 34, the current in the central axis direction generates the magnetic field 35 at the position of the floating piston 30, and as a result, the electromagnetic force 36 acts on the floating piston 30. As the floating piston 30 moves, it compresses the puffer chamber 29, resulting in compressed gas at the opening 37 as indicated by the arrow.
From which gas flows 38, 39 flow out and are blown onto the arc 32.

As described above, in this embodiment, a strong electromagnetic force can be obtained because the magnetic field acts on a large breaking current. Further, this embodiment can obtain the same effect as that of the first embodiment, but further, in this embodiment, since the floating piston is lighter than the case where the floating piston is made of solid metal, the displacement due to the electromagnetic force becomes large. Furthermore, since a conductive fluid is used,
It is possible to reduce the possibility of ignition between the puffer cylinder and the floating piston.

FIG. 4 shows a puffer type gas circuit breaker according to a fourth embodiment (corresponding to claim 4) of the present invention. FIG. 4A is a sectional view in the closed state, and FIG. It is a sectional view of the state, and the basic configuration is the same as that of the second embodiment of FIG. 2 already described.

In the figure, the movable contactor portion 20 is composed of a movable main contactor 21 and a movable arc contactor 22, and is connected to an operating device (not shown). Further, in the fixed contactor portion 23, a fixed main contactor 25 and a fixed arc contactor 26 are attached to a tip end portion of a puffer cylinder 28 forming a puffer chamber 29. An insulator 31 is inserted in the puffer cylinder 28, and the insulator 3
Insulation nozzle 27 is attached to 1 and puffer chamber 29
Is composed. In the puffer room 29, the puffer room 2
A floating piston 30, which is capable of sliding contact with 9, is inserted. Further, the stopper 4 is provided on the inner surface of the puffer cylinder 28.
1 is attached.

Next, the blocking action of this embodiment will be described. When the movable contact portion 20 is moved to the left in the figure during the breaking operation, an arc is generated between the arc contacts 22 and 26. At this time, the breaking current flows through the current paths 33 and 34. Further, among the currents flowing through the current path 34, the current in the central axis direction generates the magnetic field 35 at the position of the floating piston 30, and as a result, the electromagnetic force 36 acts on the floating piston 30. As the floating piston 30 moves, it compresses the puffer chamber 29, resulting in compressed gas at the opening 37 as indicated by the arrow.
And 40 into gas streams 38 and 39, which are blown onto the arc 32. At this time, pressure is simultaneously accumulated in the spring 44. Therefore, after the completion of the interruption, the floating piston 30 biased to the left by the spring 44 in the drawing returns to the initial position.

As described above, in this embodiment, the magnetic field acts on the large breaking current, so that a strong electromagnetic force can be obtained. Further, the magnitude of the electromagnetic force depends on the magnitude of the electric current and does not depend on the position of the floating piston. Furthermore, the effect of this embodiment is the same as that of the second embodiment, and the automatic return effect of the floating piston after completion of interruption is also obtained.

FIG. 5 shows a puffer type gas circuit breaker according to a fifth embodiment (corresponding to claim 5) of the present invention. FIG. 5 (a) is a cross-sectional view of the closed state, and FIG. It is a cross-sectional view of the state, and the basic configuration is the same as that of the fourth embodiment of FIG. 4 already described.

In the figure, the movable contactor section 20 is composed of a movable main contactor 21 and a movable arc contactor 22, and is connected to an operating device (not shown). Further, in the fixed contactor portion 23, a fixed main contactor 25 and a fixed arc contactor 26 are mounted on a puffer cylinder 28 which constitutes a puffer chamber 29.

In the puffer chamber 29, a floating piston 30 which is capable of sliding contact with the puffer chamber 29 and which is integrated with the insulating nozzle 27 is inserted. The floating piston 30 is connected to the insulator 31 inserted in the puffer cylinder 28 by a spring 44, and the spring 44 has a natural length in the closed state.

Next, the blocking action of this embodiment will be described. When the movable contact portion 20 is moved to the left in the figure during the breaking operation, an arc 32 is generated between the arc contacts 22 and 26. At this time, the breaking current flows through the current paths 33 and 34. Further, of the currents flowing through the current path 34, the current in the central axis direction generates a magnetic field 35 at the position of the floating piston 30, and as a result, an electromagnetic force 36 is exerted on the floating piston 30d.
Works. When the floating piston 30d moves, the puffer chamber 2
As a result of compressing 9, the compressed gas exits the openings 37 and 40 as gas streams 38 and 39, as shown by the arrows, and is blown onto the arc 32. At this time, pressure is simultaneously accumulated in the spring 44. Therefore, after the interruption is completed, the spring 4
The floating piston 30d, which is urged to the left by 4 in the figure, returns to the initial position.

In this embodiment, since a magnetic field acts on a large breaking current, a strong electromagnetic force can be obtained. Further, the magnitude of the electromagnetic force depends on the magnitude of the electric current and does not depend on the position of the floating piston.

The effect of this embodiment is similar to that of the fourth embodiment. Furthermore, since the insulating nozzle is integrated with the floating piston, a strong spray can be obtained when a large current is cut off, but the displacement of the floating piston when a small current is cut off. When is small, the flux is slow in the vicinity of the movable arc contactor because it is blocked by the nozzle throat, and the flux is also slow in the vicinity of the fixed arc contactor because the blowing cross section is large. Therefore, it is possible to avoid a decrease in density due to high-speed flow near any of the contacts.

6 and 7 show a puffer type gas circuit breaker of a sixth embodiment (corresponding to claim 6) of the present invention, and FIG.
Is a cross-sectional view of the closing state, FIG. 7B is a cross-sectional view of the initial state of the breaking operation, and FIG.
FIG. 11B is a sectional view of the state in the latter half of the closing operation, and the basic configuration is the same as that of the fourth embodiment of FIG.

In the figure, the movable contactor section 20 is composed of a movable main contactor 21 and a movable arc contactor 22, and the movable main contactor 21 is connected to an operating device (not shown) via an operating rod 46. It is connected. The movable arc contact 22 is connected to the operation rod 46 via the link mechanism 45. The link mechanism 45 is provided with some play on the movable arc contact 22 side so that the relative axial positions of the movable main contact 21 and the movable arc contact 22 can be changed.

In the fixed contactor section 23, a fixed main contactor 25 and a fixed arc contactor 26 are mounted on a puffer cylinder 28 forming a puffer chamber 29. An insulator 31 is inserted into the puffer cylinder 28, and an insulating nozzle 27 is attached to the insulator 31 to form a puffer chamber 29. A floating piston 30 capable of sliding contact with the puffer chamber 29 is inserted into the puffer chamber 29. The floating piston 30 is connected by a spring 44 to an insulator 31 inserted in the puffer cylinder 28, and the spring 44 has a natural length in a closed state.

Next, the blocking action of this embodiment will be described. When a disconnection command is given to the closed state of FIG. 6A, the movable contactor section 20 moves to the left in the figure. FIG.
As shown in (b), in the initial stage of the breaking operation, the movable arc contact 22 does not follow the operation of the movable main contact 25 due to the play of the link mechanism 45. When the breaking operation further progresses, the movable arc contact 22 also starts to move and the main contact 2
As a result of 1 and 25 opening, and then the arc contacts 22 and 26 opening, an arc 32 is generated between the arc contacts 22 and 26 as shown in FIG. 7A. At this time, the breaking current flows through the current paths 33 and 34. In addition, the current path 34
The electric current in the central axis direction of the electric current flowing through the magnetic field generates a magnetic field 35 at the position of the floating piston 30, and as a result, an electromagnetic force 36 acts on the floating piston 30. As a result of the floating piston 30 moving and compressing the puffer chamber 29, compressed gas flows through the openings 37 and 40 through the gas streams 38 and 3 as indicated by the arrows.
It becomes 9 and flows out, and it is sprayed on the arc 32. At this time, the spring 44 simultaneously accumulates pressure. Therefore, after the completion of the interruption, the floating piston 30 biased to the left by the spring 44 in the drawing returns to the initial position.

In this embodiment, since a magnetic field acts on a large breaking current, a strong electromagnetic force can be obtained. Also,
The magnitude of the electromagnetic force depends on the magnitude of the electric current and does not depend on the position of the floating piston.

Next, when the closing operation is performed, the movable main contact 21 first starts to move, and then the movable arc contact 22 follows. Therefore, as shown in FIG. 7B, the time from the contact between the arc contacts 22 and 26 to the contact between the main contacts 21 and 25 becomes short.

This embodiment is similar to the effect of the fourth embodiment in FIG. Furthermore, since the arc contactor and the energization contactor start energization at the same time at the time of making, it is possible to avoid the compression operation due to the energization of the floating piston at the time of making operation.

FIG. 8 shows a puffer-type gas circuit breaker according to a seventh embodiment (corresponding to claim 7) of the present invention. FIG. 8A is a sectional view in the closed state, and FIG. It is sectional drawing of a state.

In the figure, the fixed contactor portion 54 is composed of a fixed main contactor 55 and a movable arc contactor 56. Further, the movable contactor section 50 has a movable main contactor 51 on a flange 57 installed at the tip of the puffer cylinder 58 forming the puffer chamber 59 perpendicularly to the cylinder center axis.
A movable arc contact 52 and an insulating nozzle 53 are attached. These movable contact portions 50 are integrally connected to an operating device (not shown).

A floating piston 60 capable of sliding contact with the puffer chamber 59 is inserted into the puffer chamber 59.
The floating piston 60 has an insulator fixing support 71 by a spring 70.
It is connected to the. The floating piston 60, the spring 70, and the insulator fixing support 71 are in sliding contact with the movable contactor portion 51, but are not integrally configured. The spring 70 has a natural length in the closed state. Further, a part of the inner peripheral portion of the puffer cylinder 58 is made of an insulator 61.

Next, the blocking action of this embodiment will be described. When the movable contact 51 is moved to the right in the figure during the breaking operation, an arc 62 is generated between the arc contacts 53 and 56. The cutoff current flows through the current paths 63 and 64. Of the currents flowing through the current path 64, the current in the central axis direction generates a magnetic field 65 at the position of the floating piston 60, and as a result, an electromagnetic force 66 acts on the floating piston 60. When the floating piston 60 moves, the puffer chamber 59 is compressed by the synergistic effect with the movement of the puffer cylinder 58.
The compressed gas flows from the opening 67 through the gas flow 6 as indicated by the arrow.
It flows out as 8 and 69 and is sprayed on the arc 62. At this time, the pressure is simultaneously accumulated in the spring 70. Therefore, after the completion of the interruption, the floating piston 60, which is urged to the left in the figure by the spring 70, returns to the initial position.

As described above, in this embodiment, since the driving by the external operating force of the puffer cylinder and the driving by the electromagnetic force of the floating piston are used together, a high pressure rise can be obtained. Generally, to obtain a high pressure rise, it is necessary to increase the compression volume. As means for this, increasing the cylinder cross-sectional area and increasing the stroke length can be considered, but according to the present embodiment, it is possible to increase the compression volume while avoiding both. That is, by driving both the cylinder and the piston, it is possible to increase the compression volume by prolonging the substantial stroke length. Further, the effect of this embodiment is similar to that of the first embodiment. In addition, the automatic return effect of the floating piston by the spring can be obtained.

FIG. 9 shows a puffer type gas circuit breaker according to an eighth embodiment (corresponding to claim 8) of the present invention. FIG. 9 (a) is a sectional view in the closed state, and FIG. 9 (b) is a latter stage of the breaking operation. FIG. 3 is a sectional view of the state, and the basic configuration is the same as that of the first embodiment of FIG. 1.

In the figure, the movable contactor section 20 is composed of a movable main contactor 21 and a movable arc contactor 22, and is connected to an operating device (not shown). In addition, the fixed contactor portion 23 has a fixed main contactor 25, a fixed arc contactor 26, and an insulating nozzle 27 on a flange 24 installed at the tip of a puffer cylinder 28 forming a puffer chamber 29 perpendicular to the cylinder center axis. Is attached.

A floating piston 30 capable of sliding contact with the puffer chamber 29 is inserted into the puffer chamber 29, and the floating piston 30 is connected to the puffer cylinder 28 through a spring 44. In addition, in the puffer cylinder 28,
In addition to the puffer chamber 29, the pressure accumulating chamber 47 is provided on the movable contactor 20 side.
Is provided. The pressure accumulating chamber 47 has openings 37 and 40.
Through the gas passage on the insulating nozzle 27 side and the puffer chamber 2
9 in communication. Further, a part of the puffer cylinder 28 is made of an insulator 31.

Next, the blocking action of this embodiment will be described. When the movable contact portion 20 is moved to the left in the figure during the breaking operation, an arc 32 is generated between the arc contacts 22 and 26. At this time, the breaking current flows through the current paths 33 and 34. Further, among the currents flowing through the current path 34, the current in the central axis direction generates the magnetic field 35 at the position of the floating piston 30, and as a result, the electromagnetic force 36 acts on the floating piston 30. When the floating piston 30 moves, the puffer chamber 29 is compressed. In addition, the pressure in the accumulator 47 increases due to the synergistic effect with the thermal energy of the arc 32. In the latter stage of the shutoff operation, the compressed gas flows out from the opening 37 of the pressure accumulating chamber 47 as a gas flow 39 as shown by the arrow, and is blown onto the arc 32.

As described above, according to the present embodiment, even after the breaking current is attenuated near the zero point and the electromagnetic force is weakened, the pressure increase accumulated in the pressure accumulating chamber makes it possible to continue to blow the arc. Therefore, a long spraying time can be obtained. Further, the effect of this embodiment is similar to that of the first embodiment. In addition, the automatic return effect of the floating piston by the spring can be obtained.

FIG. 10 shows a ninth embodiment (corresponding to claim 9) of the puffer type gas circuit breaker. FIG. 10 (a) is a sectional view in the closed state, and FIG. 10 (b) shows the latter part of the breaking operation. FIG. 11 is a sectional view of the state, and the basic configuration is the same as that of the eighth embodiment of FIG. 9.

In the figure, the movable contactor section 20 is composed of a movable main contactor 21 and a movable arc contactor 22 and is connected to an operating device (not shown). In addition, the fixed contactor portion 23 has a fixed main contactor 25, a fixed arc contactor 26, and an insulating nozzle 27 on a flange 24 installed at the tip of a puffer cylinder 28 forming a puffer chamber 29 perpendicular to the cylinder center axis. Is attached.

A floating piston 30 capable of sliding contact with the puffer chamber 29 is inserted into the puffer chamber 29, and the floating piston 30 is connected to the puffer cylinder 28 through a spring 44. A ventilation passage 48 is provided on the inner wall of the puffer cylinder 28. The gas passage on the insulating nozzle 27 side and the puffer chamber 29 communicate with each other through the opening 37. Further, a part of the puffer cylinder 28 is made of an insulator 31.

Next, the operation of this embodiment will be described.
When the movable contact portion 20 is moved to the left in the figure during the breaking operation, an arc 32 is generated between the arc contacts 22 and 26. At this time, the breaking current flows through the current paths 33 and 34. Further, among the currents flowing through the current path 34, the current in the central axis direction generates the magnetic field 35 at the position of the floating piston 30, and as a result, the electromagnetic force 36 acts on the floating piston 30. When the floating piston 30 moves, the puffer chamber 29 is compressed. Further, in the initial stage of the shutoff operation, the pressure in the puffer chamber 29 rises due to a synergistic effect with the thermal energy of the arc flowing through the ventilation passage 48. As a result, the compressed gas flows as a gas flow 38 from the opening 37 as shown by the arrow, and is blown onto the arc 32. In the latter half of the shutoff operation, the hot gas becomes a gas flow 39 and is discharged to the outside of the arc extinguishing chamber.

As described above, according to the present embodiment, it is possible to obtain the pressure increase at the early stage of the breaking operation by the thermal energy of the arc. In addition, by discharging hot gas to the outside of the arc extinguishing chamber in the latter half of the shutoff operation, it is possible to quickly recover the insulation. Further, the effect of this embodiment is similar to that of the first embodiment. In addition, the automatic return effect of the floating piston by the spring can be obtained.

In addition to the above embodiments, the present invention can be applied to a gas circuit breaker in which a pair of contact portions are both movable. Further, the current path, the floating piston, the structure of the puffer chamber, the heat exhaust structure, etc. are not limited to the above-mentioned embodiments, and it goes without saying that they can be appropriately modified within the scope of the claims of the present invention.

[0063]

As described above, according to the first aspect of the present invention.
According to the ninth aspect, since the puffer chamber is compressed by the electromagnetic force, the energy required for the operation is limited to the energy for driving the movable main contactor and the movable arc contactor, and the operating force can be reduced. This makes it possible to manufacture the operating device in a small size and at a low cost. Further, since the breaking current is used to generate the electromagnetic force, a strong electromagnetic force can be obtained. Further, since the breaking current is used to generate the electromagnetic force, it is possible to obtain a strong electromagnetic force. Furthermore, the larger the breaking current, the stronger the electromagnetic force, that is, the compressive force can be obtained, and the higher the pressure rise can be obtained. Moreover, when the breaking current is small, the compressive force becomes weak and the pressure rise becomes relatively low, so it is possible to reduce the rise in gas flux near the arc contactor and the accompanying decrease in density, and as a result The effect is that excellent insulation recovery can be obtained.

[Brief description of drawings]

FIG. 1 shows a puffer type gas circuit breaker according to a first embodiment of the present invention, FIG. 1 (a) is a sectional view in a closed state, and FIG.

2A and 2B show a puffer type gas circuit breaker according to a second embodiment of the present invention, wherein FIG. 2A is a sectional view in a closed state, and FIG.

3A and 3B show a puffer type gas circuit breaker according to a third embodiment of the present invention, where FIG. 3A is a sectional view in a closed state, and FIG. 3B is a sectional view in a state in the latter half of the breaking operation.

4A and 4B show a puffer type gas circuit breaker according to a fourth embodiment of the present invention, wherein FIG. 4A is a sectional view in a closed state, and FIG.

5A and 5B show a puffer type gas circuit breaker according to a fifth embodiment of the present invention, where FIG. 5A is a sectional view in a closed state, and FIG. 5B is a sectional view in a latter stage state of a breaking operation.

6A and 6B show a puffer type gas circuit breaker according to a sixth embodiment of the present invention, wherein FIG. 6A is a sectional view in the closed state, and FIG. 6B is a sectional view in the initial state of the breaking operation.

7A is a cross-sectional view of the state in the latter half of the breaking operation of FIG. 6, and FIG. 7D is a cross-sectional view of the initial state of the breaking operation of FIG.

8A and 8B show a puffer type gas circuit breaker according to a seventh embodiment of the present invention, wherein FIG. 8A is a sectional view in a closed state, and FIG. 8B is a sectional view in a latter stage state of a breaking operation.

9A and 9B show a puffer type gas circuit breaker according to an eighth embodiment of the present invention, wherein FIG. 9A is a sectional view in a closed state, and FIG. 9B is a sectional view in a latter stage state of a breaking operation.

10A and 10B show a puffer type gas circuit breaker according to a ninth embodiment of the present invention, wherein FIG. 10A is a sectional view in the closed state, and FIG. 10B is a sectional view in the latter stage of the breaking operation.

11 (a) is a sectional view of a conventional puffer type gas circuit breaker in a closed state, and FIG. 11 (b) is a sectional view of a conventional puffer type gas circuit breaker in a latter stage of a breaking operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed contact part, 2 ... Fixed main contact, 3 ... Fixed arc contact, 4 ... Movable contact part, 5 ... Movable main contact, 6 ... Movable arc contact, 7 ... Insulation nozzle, 8 ... Puffer Cylinder, 9 ... Operation rod, 10 ... Puffer piston, 11 ...
Puffer chamber, 12 ... Arc, 13 ... Opening part, 14 ... Gas flow, 15 ... Blowout port, 16 ... Fixed sideward flow, 17 ...
Movable sideward flow, 20 ... Movable contactor part, 21 ... Movable main contactor, 22 ... Movable arc contactor, 23 ... Fixed contactor part,
24 ... Flange, 25 ... Fixed main contact, 26 ... Fixed arc contact, 27 ... Insulation nozzle, 28 ... Puffer cylinder, 29 ... Puffer chamber, 30 ... Floating piston, 31 ... Insulator, 32 ... Arc, 33 ... Current Path, 34 ... Current path, 35 ... Direction of magnetic field, 36 ... Direction of electromagnetic force, 37 ... Opening part, 38 ... Gas flow, 39 ... Gas flow, 40 ... Opening part, 4
1 ... Stopper, 42 ... Conductive fluid, 43 ... Insulating partition,
44 ... Spring, 45 ... Link mechanism, 46 ... Operation rod, 4
7 ... Accumulation chamber, 48 ... Ventilation passage, 50 ... Movable contact part, 51
... movable main contactor, 52 ... movable arc contactor, 53 ... insulating nozzle, 54 ... fixed contactor part, 55 ... fixed main contactor, 5
6 ... Movable arc contactor, 57 ... Flange, 58 ... Puffer cylinder, 59 ... Puffer chamber, 60 ... Floating piston,
61 ... Insulator, 62 ... Arc, 63, 64 ... Current path,
65 ... magnetic field, 66 ... electromagnetic force, 67 ... opening, 68, 69
… Gas flow, 70… Spring, 71… Insulator fixing support.

Claims (9)

[Claims] 1. A container in which an arc-extinguishing gas is sealed has a pair of contact parts, which are composed of a current-carrying contact and an arc contact, and are arranged to face each other. At least one of the contact parts is an operating mechanism part. And a puffer chamber provided with a blowing gas flow path constituted by an insulating nozzle or the like for blowing the compressed arc-extinguishing gas to the arc position. In the type gas circuit breaker, a puffer chamber is constituted by a large-diameter cylinder, a small-diameter cylinder concentric with the large-diameter cylinder, and a flange installed perpendicularly to the central axis of the cylinder at the contactor-side tips of the both cylinders. A floating piston is provided in sliding contact with the inner diameter portion of the diameter cylinder and the outer diameter portion of the small diameter cylinder, and the flange is provided with an arc contactor, an insulating nozzle, and a ventilation path from the interior of the puffer chamber to the gas flow path. The above The flange and the floating piston are made of a conductive material, and the small-diameter cylinder is made of a part of the flange side made of an insulating material and the rest made of a conductive material.
The arc contactor, the flange, the large-diameter cylinder, the floating piston, the small-diameter cylinder constitute a current path of the breaking current in this order, and the energizing current of the floating piston is in the radial direction with respect to the central axis.
A puffer-type gas circuit breaker characterized in that a magnetic field generated by a current flowing through a small-diameter cylinder is configured to rotate in a rotational direction with respect to a central axis. 2. A container in which an arc-extinguishing gas is sealed has a pair of contact portions which are composed of a current-carrying contactor and an arc contactor and which are arranged opposite to each other, and at least one of the contactor portions is an operating mechanism section. And a puffer chamber provided with a blowing gas flow path constituted by an insulating nozzle or the like for blowing the compressed arc-extinguishing gas to the arc position. Type gas circuit breaker, a puffer chamber is constituted by a large-diameter cylinder, a small-diameter cylinder concentric therewith, and a flange connected to both of the cylinders and installed perpendicularly to the cylinder center axis. And a floating piston provided in sliding contact with the small-diameter cylinder outer shape part, electrically connecting the small-diameter cylinder tip and the arc contactor,
A ventilation path is provided from the flange side of the interior of the puffer chamber to the gas flow path, and the large diameter cylinder, the small diameter cylinder and the floating piston are made of a conductive material, and the flange is made of an insulating material. A magnetic field that forms a current path for the breaking current in the order of the arc contactor, the small diameter cylinder, the floating piston, and the large diameter cylinder, and that the energization current of the floating piston causes the energization current of the small diameter cylinder in the radial direction with respect to the central axis. A puffer-type gas circuit breaker characterized in that it is configured so as to rotate in the direction of the center axis. 3. The puffer type gas circuit breaker according to claim 1 or 2, wherein a plurality of parallel parallel contacts made of this insulating material are in sliding contact with the large diameter cylindrical inner diameter portion and the small diameter cylindrical outer diameter portion. Provide a ring-shaped disc, connect multiple ring-shaped discs with multiple rods, etc., and conduct electricity to a sealed closed space composed of multiple ring-shaped discs, large-diameter cylindrical inner diameter part, and small-diameter cylindrical outer shape part. A puffer-type gas circuit breaker characterized in that the floating piston is constituted by a ring-shaped disc and a conductive fluid, which is filled with a volatile fluid. 4. The puffer type gas circuit breaker according to claim 1, claim 2 or claim 3, wherein an elastic member such as a spring that connects the floating piston and the flange is provided, and the elastic member is in a closed state. A puffer-type gas circuit breaker that has a natural length and is configured to urge the floating piston in the direction opposite to the compression direction during compression operation. 5. The puffer-type gas circuit breaker according to claim 1, claim 2, claim 3, or claim 4, wherein the insulating nozzle is connected to a contact side of the floating piston, and the floating piston and the insulation are connected to each other. A puffer type gas circuit breaker characterized by the fact that the nozzle operates as a unit. 6. The puffer-type gas circuit breaker according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the contactor portion facing the puffer chamber operates the energizing contactor by the operation. Directly connected to the mechanical part, the arc contactor is connected to the energizing contactor through the link mechanism, and the operation start of the arc contactor is the time to start the operation of the energizing contactor at the initial stage of the breaking operation and the closing operation. A puffer type gas circuit breaker, characterized in that play is provided at a connecting portion between the arc contactor and the link mechanism so as to be delayed. 7. The puffer type gas circuit breaker according to claim 1, claim 2, claim 3, claim 4, claim 5 or claim 6, wherein the contactor including the puffer chamber is integrated. A puffer-type gas circuit breaker, which is connected to the operation mechanism section and is driven during a breaking operation. 8. The puffer type gas circuit breaker according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6 or claim 7, wherein: A puffer-type gas circuit breaker, characterized in that a pressure accumulating chamber that is connected to both of them and is surrounded by the large diameter cylinder and the small diameter cylinder is provided. 9. The puffer type gas circuit breaker according to claim 1, claim 2, claim 3, claim 4, claim 5, claim 6, claim 7, or claim 8 at the initial stage of a breaking operation. A puffer-type gas circuit breaker, characterized in that, in the step, a vent passage configured to communicate the puffer chamber and the arc generation position is provided.