JP6084506B2 - Sliding member for gas circuit breaker and gas circuit breaker using the same - Google Patents

Description

  Embodiments described herein relate generally to a gas circuit breaker that cuts off current in an electric power system and a sliding member that is disposed between slidable members used in the gas circuit breaker.

Currently, in the electric power system high voltage large capacity, gas-insulated switchgear apparatus with insulation and arc-extinguishing medium SF ₆ gas is widely used. As a main device constituting the gas insulated switchgear, there is a gas circuit breaker filled with SF ₆ gas. This gas circuit breaker is a power device capable of quickly interrupting a fault current in the power system. The gas circuit breaker mechanically disconnects the contact during the disconnection process, and extinguishes the arc generated by the disconnection by blowing an insulating and arc-extinguishing medium.

  The type of gas circuit breaker as described above is now widely used as a puffer type. The puffer-type gas circuit breaker is arranged in a sealed container filled with an arc extinguishing gas, with a fixed arc contact and a fixed energizing contact, and a movable arc contact and a movable energizing contact arranged to face each other. Is brought into contact or separated by a mechanical driving force to conduct or cut off the current.

  In this gas circuit breaker, the volume decreases with the separation of the contact, and the pressure accumulation space in which the arc extinguishing gas is accumulated and the arc contacts are arranged so as to surround both arc contacts, and the pressure is accumulated in the pressure accumulation space. An insulating nozzle is provided to guide the arc extinguishing gas to the arc.

  In the interruption process, the fixed arc contact and the movable arc contact are separated to generate an arc between the arc contacts. The arc-extinguishing gas, which has been sufficiently accumulated in the accumulator space with the separation of the contacts, is strongly blown to the arc through the insulating nozzle, thereby recovering the insulation performance of both arc contacts and extinguishing the arc. Complete the current interruption.

JP 2007-294358 A

  In the conventional gas circuit breaker as described above, the pressure accumulating space is, for example, a cylindrical shape in which one end face is a bottomed cylindrical cylinder, a piston that is a donut-shaped flat plate, and a cylinder connected to the cylinder. And is surrounded by an operation rod. The pressure accumulating space is formed by placing a piston in the cylinder so as to face one end surface of the cylinder, inserting an operation rod through the donut opening of the piston, and penetrating the operation rod into the cylinder. In other words, the one end surface and the side surface of the cylinder are the one end surface and the outer peripheral surface of the pressure accumulation space. Further, the outer peripheral surface of the operating rod becomes the inner peripheral surface of the pressure accumulation space. The piston becomes the other end surface of the pressure accumulation space.

  The decrease in the volume of the pressure accumulating space is caused by the fact that one end surface of the cylinder approaches the piston as the cylinder moves with the movement of the operating rod. At this time, the cylinder and the operating rod slide with respect to the piston.

Between the cylinder and the piston, and between the operation rod and the piston, a sliding material that reduces friction is disposed. This sliding material is required to have low friction characteristics, and currently, PTFE-based materials are mainly used. However, PTFE materials are known to swell in an SF ₆ gas atmosphere and may adversely affect low friction properties. Therefore, a filler such as glass fiber is mixed to improve the characteristics.

  However, dust and the like are generated in the sliding operation by many times of opening and closing, and the surface of the sliding material becomes rough, thereby causing problems such as an increase in frictional resistance and a decrease in insulation performance. This has been an adverse effect of improving the device reliability of the gas circuit breaker.

Further, even when a filler such as glass fiber is mixed with the PTFE material, the sliding material may absorb SF ₆ gas from the surface and swell.

  The sliding member for a gas circuit breaker according to the present embodiment is made to solve the above-described problems, and an object thereof is to provide a sliding member that realizes low friction and gas barrier properties. Another object is to provide a gas circuit breaker using the sliding member.

  In order to achieve the above object, the sliding member for a gas circuit breaker according to the present embodiment is a sliding member for a gas circuit breaker disposed between members that are in contact with each other and are relatively slidable. The sliding member includes a base material and an ion implantation layer formed by ion implantation on at least a part of the surface of the base material, and the ion implantation layer includes a multivalent ion. Is formed by ion implantation.

  Moreover, the gas circuit breaker using the said sliding member is also contained in the aspect of this invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the whole structure of the gas circuit breaker which concerns on 1st Embodiment, Comprising: (a) is sectional drawing of the gas circuit breaker which shows a normal closing (electric current supply) state, (b) is opening. It is sectional drawing of the gas circuit breaker which shows the state of (in current interruption operation | movement). It is an expanded sectional view near the cylinder of the gas circuit breaker concerning a 1st embodiment. It is a partial cross section figure of the sliding member for gas circuit breakers concerning a 1st embodiment. It is a partial cross section figure of the sliding member for gas circuit breakers concerning a 2nd embodiment. It is a partial cross section figure of the sliding member for gas circuit breakers concerning a 3rd embodiment.

[First Embodiment]
(Constitution)
Below, the whole structure of the gas circuit breaker of this embodiment is demonstrated, referring FIGS. FIG. 1 is a cross-sectional view showing the overall configuration of the gas circuit breaker of the present embodiment. FIG. 1 (a) shows a normally closed (current-carrying) state, and FIG. It shows the state of current interruption operation).

  The gas circuit breaker of this embodiment has the airtight container 1 which consists of the earthed metal, and the arc extinguishing gas is filled in the inside.

The arc extinguishing gas is a gas excellent in arc extinguishing performance and insulation performance, and examples thereof include sulfur hexafluoride gas (SF ₆ gas). However, SF ₆ gas is said to have a global warming effect 23,900 times that of carbon dioxide gas. From the viewpoint of environmental conservation, SF ₆ gas may be a gas having a smaller global warming potential than SF ₆ gas. good. Examples of the gas having a small global warming potential include air, carbon dioxide, oxygen, nitrogen, or a mixed gas thereof.

  As shown in FIG. 1, the gas circuit breaker according to the present embodiment is roughly divided into a fixed contact portion 3 and a movable contact portion 4, and includes a plurality of members having a shape mainly composed of a cylinder. Each member is disposed in the closed container 1 with a central axis (hereinafter simply referred to as an axis) aligned. Hereinafter, in order to describe the positional relationship and direction of each member, the direction on the fixed contact portion 3 side is referred to as the front, and the direction on the opposite side of the movable contact portion 4 is referred to as the rear.

  The fixed contact portion 3 refers to the fixed energizing contact 6 and the fixed arc contact 5. The movable contact portion 4 refers to a movable arc contact 8, a movable energized contact 10, an insulating nozzle 9, a movable cylinder 7, and an operation rod 12. Hereinafter, each member will be described in detail.

  As shown in FIG. 1, the closed energized container 1 is arranged so that the fixed energizing contact 6 and the movable energizing contact 10 are opposed to each other so that the fixed arc contact 5 and the movable arc contact 8 extend coaxially. ing.

  The fixed energizing contact 6 and the movable energizing contact 10 are cylindrical conductors each having an open end surface, and are arranged on the same axis with the openings facing each other. The opening edge of the fixed energizing contact 6 bulges inside, and the inner diameter of the opening edge portion and the outer diameter of the movable energizing contact 10 are the same.

  The movable energizing contact 10 is movable with respect to the fixed energizing contact 6, and the movable energizing contact 10 is inserted into the opening of the fixed energizing contact 6, thereby moving the inner surface of the fixed energizing contact 6. It will be in the state which can contact with the outer surface of the electricity supply contactor 10, and can electrically conduct.

  The fixed energizing contact 6 is fixed to a fixed support 31. That is, the fixed support 31 is a hollow and substantially cylindrical conductor, and the fixed energizing contact 6 is fixed so that the edge of the fixed support 31 has a cylindrical shape. The fixed arc contact 5 is a solid cylindrical conductor whose one end is rounded. A support portion 32, which is a rod-like or plate-like member, is fixed to the inner wall surface of the fixed support 31 so as to protrude from the inner wall surface of the fixed support 31 into the fixed support 31. The fixed arc contact 5 is fixedly supported in the fixed support 31 via the support portion 32.

  The movable arc contact 8 is a conductor having a cylindrical shape with both ends opened. In the current interruption process, the movable arc contact 8 is separated from the fixed arc contact 5 and an arc space in which an arc is generated is formed between the contacts 5 and 8.

  The opening edge of the movable arc contact 8 bulges inside, and its inner diameter matches the outer diameter of the fixed arc contact 5. The movable arc contact 8 is movable with respect to the fixed arc contact 5, and when the fixed arc contact 5 is inserted into the opening of the movable arc contact 8, both the contacts 5, 8 come into contact with each other and become conductive. It will be ready.

  The tip of the movable arc contact 8 may be divided in the circumferential direction to form a finger electrode. In this case, the movable arc contact 8 has flexibility, and the inner diameter of the opening edge of the movable arc contact 8 is slightly smaller than the outer diameter of the fixed arc contact 5 and is narrowed. When the fixed arc contact 5 is inserted into the opening of the movable arc contact 8, both the contacts 5 and 8 come into contact with each other and become conductive.

  The movement of the movable arc contact 8 relative to the fixed arc contact 5 is caused by the operating rod 12 fixedly supported by the movable arc contact 8. The operation rod 12 has a cylindrical shape with an opening at the front and a bottom at the other end, and the inside is hollow, and is arranged coaxially with the movable arc contact 8 and the fixed arc contact 5. Yes. The movable arc contact 8 and the operating rod 12 have the same diameter, and the movable arc contact 8 is erected on the opening edge of the front end of the operating rod 12.

  The operating rod 12 is connected to the mechanism unit 11 connected to the sealed container 1 via an insulating rod 22 that is a solid cylinder having insulating properties. The mechanism part 11 pushes and pulls the operating rod 12 in the axial direction via the insulating rod 22 to move it. The movable arc contact 8 and the movable energizing contact 10 are in contact with or separated from the fixed arc contact 5 and the fixed energizing contact 6 depending on the degree of movement of the operating rod 12.

  A balm Kuchen-shaped pressure accumulation space 20 surrounded by the movable cylinder 7, the operation rod 12, and the piston 19 is formed around a part of the entire length of the operation rod 12 on the fixed contact portion 3 side.

  The movable cylinder 7 is a conductor having a bottomed cylindrical shape at one end surface, and is disposed coaxially so that the end surface having the bottom is forward and the side surface surrounds the operation rod 12. The front end surface of the movable cylinder 7 is aligned and connected so as to be flush with the front end of the operation rod 12. The front end surface and the inner peripheral surface of the movable cylinder 7 become the front end surface and the outer peripheral surface of the pressure accumulation space 20. Further, the operation rod 12 is coaxially arranged so as to penetrate the inside of the movable cylinder 7, and the peripheral surface of the operation rod 12 becomes the inner peripheral surface of the pressure accumulation space 20. The piston 19 has a plate shape and is formed in a donut shape. The operation rod 12 is slidably penetrated through the donut-shaped opening, and the outer diameter substantially coincides with the inner diameter of the movable cylinder 7. That is, the piston 19 serves as an end face behind the pressure accumulation space 20.

  The volume of the pressure accumulating space 20 is variable as the front end surface of the movable cylinder 7 is moved by the movement of the operation rod 12. Due to the approach of the front end surface of the movable cylinder 7 to the piston 19, the volume of the pressure accumulating space 20 is reduced, the arc extinguishing gas in the pressure accumulating space 20 is compressed and accumulated, and a gas flow is generated in the pressure accumulating space 20. ing.

  As shown in FIG. 1, the piston 19 is fixedly supported in the hermetic container 1 by a support 33 and an insulating support base 34 via a piston support 19a. The piston support 19 a has a cylindrical shape that linearly extends in the axial direction from the piston 19, is refracted from the middle and extends toward the support 33, and the tip thereof is fixed by the support 33. The support 33 is a substantially cylindrical conductor, and is disposed such that the movable cylinder 7 is fitted into the front opening with the bottomed end surface facing the rear. An end face behind the support 33 is opened, and the operation rod 12 is inserted through the opening so as to penetrate the support 33.

  On the rear end surface of the support 33, an insulating support base 34 having a cylindrical shape is arranged coaxially. The insulating support base 34 supports a member that becomes a part of the electric circuit in an energized state. The insulating support base 34 is an insulating member, one end of which is connected to the support 33, and the other end is fixed to the mechanism portion 11 fixedly connected to the sealed container 1, and the support 33, the piston support 19 a and the piston 19 are connected. While fixing and supporting, the support 33, the mechanism part 11, and the airtight container 1 are insulated. The insulating rod 22 is surrounded by the support 33 and the insulating support base 34.

  In the energized state, the fixed support 31, the fixed energized contact 6, the movable energized contact 10, the movable cylinder 7 and the support 33 are electrically connected, and these members become one of the electrical paths. The current is drawn to the outside through the conductors 2 a and 2 b connected to the fixed support 31 and the support 33. An insulating cylinder 23 made of an insulator is joined between the fixed support 31 and the support 33, and the fixed support 31 and the support 33 are insulated.

  A sliding portion 33 a is provided on the front side of the support 33. As shown in FIGS. 1 and 2, a space is formed between the support 33 and the piston support 19 a, and the side surface of the movable piston 7 is closed by the operation rod 12 in the sealed container 1 during the blocking process. It slides in the axial direction with respect to the sliding portion 33a and the piston 19 fixed inside. The operation rod 12 also slides in the axial direction with respect to the piston 19 and the piston support 19a.

  As shown in FIGS. 1 and 2, the outer peripheral surface and inner peripheral surface of the piston 19, the inner peripheral surface of the piston support 19a, and the sliding portion 33a of the support 33 are provided with grooves in the circumferential direction. An annular sliding member 13 is disposed. The sliding member 13 is slidably in contact with movable members such as the movable cylinder 7 and the operating rod 12 while being disposed in the groove.

  FIG. 3 is a partial cross-sectional view of the sliding member 13 according to the present embodiment. As shown in FIG. 3, the sliding material 13 includes a base material 15, an ion implantation layer 16, and a sliding surface 17. The base material 15 is a main body of the sliding material 13 and is made of a resin material such as PTFE (polytetrafluoroethylene) or PEEK (polyetheretherketone) having good slidability. The ion implantation layer 16 is a layer formed by implanting polyvalent ions into the surface of the base material 15, and the inside of the base material 15 is modified by the ion implantation, and the surface of the ion implantation layer 16 becomes smooth. Yes. The ion-implanted layer 16 is formed with a predetermined thickness, and multivalent ions may be ions such as B (boron), BN (boron nitride), and C (carbon). The sliding surface 17 is a surface of the ion implantation layer 16 and is a surface that is in sliding contact with a movable member such as the movable cylinder 7 or the operation rod 12.

  The sliding part 33a of the support 33 is provided with a multilam band contact 14 made of a metal material. The multi-ramband contact 14 is in contact with the side surface of the movable cylinder 7 and electrically connects the movable cylinder 7 and the support 33. That is, the multi-ramband contact 14 ensures energization characteristics in the process in which the side surface of the movable cylinder 7 slides with respect to the sliding portion 33 a of the support 33.

  The multi-ramband contact 14 is disposed so as to be sandwiched between the two sliding members 13 in the sliding portion 33a of the support 33 as shown in FIGS. As a result, the multi-ramband contact 14 is surrounded and sealed by the sliding member 13, the sliding portion 33a, and the side surface of the movable cylinder 7.

  An insulating nozzle 9 is erected on the front end surface of the movable cylinder 7. A through hole 7a is provided in the front end surface of the movable cylinder 7, and the insulating nozzle 9 is a rectifying means for guiding the gas flow generated in the pressure accumulation space 20 to the arc space through the through hole 7a. The insulating nozzle 9 extends axially toward the fixed arc contact 5 so as to surround the movable arc contact 8, and after passing through the tip of the movable arc contact 8, the inner diameter is larger than the outer diameter of the fixed arc contact 5. It is narrowed to a slightly large extent, and has a shape that linearly expands toward the tip when it reaches the throat portion that is the minimum inner diameter portion.

  In the shut-off operation process, a gas flow path through which gas passes is formed in the inner space of the insulating nozzle 9. That is, the space between the insulating nozzle 9 and the movable arc contact 8, the arc space, the internal space of the insulating nozzle 9 in front of the throat portion, and the inside of the sealed container 1 communicate with each other. This communicating space becomes a gas flow path, and becomes one of the exhaust flow paths into the sealed container 1 for the gas flow generated in the pressure accumulating space 20.

(Function)
The current interrupting operation of the gas circuit breaker having the above configuration will be described below.
The current interrupting operation is an operation for switching the gas circuit breaker from the current energized state to the interrupted state, for example, when it is necessary to interrupt an accident current, a small advance current, a delayed load current such as a reactor interrupt, or an extremely small accident current.

  When performing the current interruption operation from the energized state, the mechanism unit 11 is driven. The movable contact portion 4 is moved in the axial direction with respect to the fixed contact portion 3 by the mechanism portion 11. That is, the movable energizing contact 10 is separated from the fixed energizing contact 6, and the movable arc contact 8 is separated from the fixed arc contact 5, so that the arc space between the arc contacts 5, 8 is separated. An arc is generated. Since this arc is very high temperature, high temperature gas is generated from the arc, and the heated arc extinguishing gas is also high temperature.

  At this time, since the front end surface of the movable cylinder 7 moves closer to the piston 19 due to the movement of the movable contact portion 4, the pressure accumulation space 20 is compressed, and the arc extinguishing gas in the pressure accumulation space 20 is compressed. Accumulated. When the interruption operation proceeds, the distance between the arc contacts 5 and 8 is sufficiently opened, and the pressure accumulation space 20 is sufficiently accumulated, a gas flow is generated in the pressure accumulation space 20. This gas flow is strongly blown against a very hot arc through a gas passage formed between the insulating nozzle 9 and the movable arc contact 8 through the through hole 7a. Thereafter, the hot gas in the arc space is discharged to the front fixed contact portion 3 side. The hot gas to the fixed contact portion 3 side passes through the inside of the insulating nozzle 9 and the fixed support 31 and is then discharged into the sealed container 1.

  In the latter half of the interruption process, the arc becomes smaller toward the current zero point, the arc is extinguished by blowing gas from the pressure accumulation space 20, and the current interruption is completed.

  In the above-described blocking operation process, the side surface of the movable cylinder 7 slides with respect to the sliding portion 33 a of the support 33 and the outer peripheral surface of the piston 19. In this process, the operating rod 12 slides with respect to the inner peripheral surface of the piston 19 and the inner peripheral surface of the piston support 19a.

  In this embodiment, the sliding member 13 is provided between a member fixed in the sealed container 1 and a movable member that slides relative to the member. By ion-implanting into the base material 15 of the sliding material 13, the composition of the base material itself changes. The ion-implanted layer 16 has a dense molecular structure formed by changing the internal composition of the base material 15 by ion implantation of multivalent ions. Thereby, the surface of the ion implantation layer 16, especially the sliding surface 17, becomes smooth, and the sliding material 13 excellent in sliding characteristics with low friction can be obtained.

In addition, since the ion implantation layer 16 having a dense molecular structure is formed on the entire surface of the base material 15, it is possible to prevent an arc-extinguishing gas such as SF ₆ gas from entering the base material 15. A gas barrier property can be obtained for the moving material 13.

  In particular, when the base material 15 is made of a resin material such as PTFE or PEEK, the arc-extinguishing gas cannot enter the ion-implanted layer 16, so that swelling can be prevented. In the present embodiment, a groove is provided on the outer peripheral surface of the piston 19 or the inner peripheral surface thereof, and the sliding member 13 is disposed in the groove, so that the side surface of the movable cylinder 7 and the outer periphery of the operation rod 12 are provided. Compared with the case where the sliding member 13 is provided on a large area such as a surface, the surface area of the sliding member 13 that comes into contact with the arc-extinguishing gas filled can be considerably reduced. Swelling caused by wear or the like can be made difficult to occur.

  The multi-ramband contact 14 is enclosed and sealed by the sliding material 13, the sliding portion 33a, and the side surface of the movable cylinder 7. Conventionally, even if it is hermetically sealed, the sliding member 13 is worn and the hermeticity is impaired in the sliding operation by many times of opening and closing. On the other hand, for example, when the movable cylinder and the multi-ram band contact are made of a metal material, metal powder is generated by many sliding operations. Since the airtightness is impaired, the metal powder may float inside the airtight container 1 and adhere to the insulating member, thereby reducing the insulating performance.

  In this embodiment, since the sliding material 13 has low friction and excellent sliding characteristics, the above-described sealing property can be maintained. For this reason, even if the movable cylinder 7 and the multi-ram band contact 14 rub against each other in the sliding operation by many times of opening and closing, the dust adheres to the insulating member such as the insulating cylinder 23 even if these dusts are generated. Therefore, it is possible to prevent a decrease in insulation performance due to the adhesion of the dust.

(effect)
(1) In the present embodiment, the sliding member 13 is constituted by the base material 15 and the ion implantation layer 16 formed by ion-implanting multivalent ions on the surface of the base material 15. Thereby, the sliding material 13 with low friction and good sliding characteristics can be obtained, and the sliding material 13 having high sliding performance can be obtained even in the sliding operation by many times of opening and closing.

(2) Since the material of the base material 15 is PTFE or PEEK, the sliding material 13 with good sliding property can be obtained. In addition, by using PTFE or PEEK as the base material 15, it is possible to suppress the generation of metal powder, which is an insulation problem that occurs during many sliding operations, compared to the case where metals are slid. can do. Even when the material of the base material 15 is PTFE or PEEK, the composition of the base material 15 in the ion implantation layer 16 is changed by ion implantation of multivalent ions, and the base material 15 is also in a gas atmosphere such as SF ₆ gas. The swelling of the material 15 can be prevented.

(3) A dense molecular structure is formed inside the base material 15 by configuring the multivalent ions to include at least one of B (boron), BN (boron nitride), and C (carbon). Thus, the sliding material 13 having low friction and excellent sliding characteristics can be obtained. Further, since the ion implantation layer 16 has a dense structure, gas intrusion from the ion implantation layer 16 can be prevented. Therefore, by forming the ion implantation layer 16 over the entire surface of the base material 15, gas barrier properties can be obtained over the entire surface of the base material 15. As a result, swelling of the base material 15 can be prevented.

(4) According to the gas circuit breaker using the sliding member 13 of this embodiment, since the sliding member 13 is excellent in sliding characteristics, the movable contact portions 4 such as the movable cylinder 7 and the operating rod 12 are made to have lower energy. Can be operated with. Therefore, it is possible to reduce the size of the gas circuit breaker without increasing the size of the mechanism unit 11.

[Second Embodiment]
(Constitution)
A second embodiment will be described with reference to FIG. The basic configuration of the second embodiment is the same as that of the first embodiment. Only points different from the first embodiment will be described, and the same parts as those of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 4 is a partial cross-sectional view of the sliding member according to the second embodiment. The sliding member 13 according to the second embodiment is different in terms of the thickness of the ion implantation layer 16. That is, the ion implantation layer 16 is common to the first embodiment in that it is formed on the entire surface of the base material 15, but the ion implantation layer 16 on the sliding surface 17 is the other portion of the ion implantation layer. It is thicker than 16.

(Function and effect)
The gas circuit breaker according to the present embodiment has the same operational effects as the first embodiment. In the present embodiment, the thickness of the ion implantation layer 16 on the sliding surface 17 is made thicker than other portions, so that the sliding characteristics can be maintained longer even when wear occurs on the sliding surface 17. . Thereby, the sliding material 13 which has high sliding performance also in sliding operation by many opening and closing can be obtained. By using the sliding member 13 of the present embodiment, the gas circuit breaker can be downsized without increasing the size of the mechanism portion 11.

[Third Embodiment]
(Constitution)
A third embodiment will be described with reference to FIG. The basic configuration of the third embodiment is the same as that of the first embodiment. Only differences from the first embodiment will be described, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

  FIG. 5 is a partial cross-sectional view of the sliding member 13 according to the third embodiment. As shown in FIG. 5, the ion-implanted layer 16 of the sliding material 13 is formed only on the portion of the sliding surface 17 and is not formed on the other portions. The portion where the ion implantation layer 16 is not formed is fitted into a groove provided on the outer peripheral surface and inner peripheral surface of the piston 19, a groove provided on the sliding portion 33 a of the support 33, and the like. That is, the portion where the ion implantation layer 16 is not formed is not exposed in the sealed container 1.

(Function and effect)
According to the present embodiment, in addition to the same functions and effects as those of the first embodiment, the following functions and effects can be achieved. That is, on the surface of the base material 15, it is the sliding surface 17 that is particularly required to have low frictional slidability. For the portion other than the ion implantation layer 16 on the sliding surface 17, the portion fits into a groove provided on the outer peripheral surface and inner peripheral surface of the piston 19, a groove provided on the sliding portion 33 a of the support 33, and the like. Therefore, the portion is not exposed in the gas atmosphere in the sealed container 1, and the ion-implanted layer 16 is formed on the exposed portion including the sliding surface 17. Intrusion of arc extinguishing gas such as SF ₆ gas can be prevented as the entire sliding member 13. Therefore, since it is sufficient to perform ion implantation only on the portion where slidability is required, the manufacturing cost can be reduced and the productivity can be improved.

[Other Embodiments]
In the present specification, a plurality of embodiments according to the present invention have been described. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. Specifically, a combination of all or any of the first to third embodiments is also included. The above embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

(1) The sliding member 13 shown in the first to third embodiments is manufactured by controlling the implantation depth by controlling the valence of multivalent ions and the acceleration energy for accelerating the multivalent ions. be able to. The acceleration energy can be given, for example, by applying a voltage to multivalent ions. In this way, by controlling the ion valence to be implanted and the acceleration energy with respect to the ion valence, nonuniformity of the ion implantation amount in the depth direction can be reduced, and the thickness of the ion implantation layer can be made constant. Can do. Thereby, a sliding material with stable sliding characteristics can be manufactured.

(2) In the first to third embodiments, the fixed contact portion 3 is fixed and only the movable contact portion 4 is moved in the axial direction. However, the movable contact portion 4 is relative to the fixed contact portion 3. Alternatively, the fixed contact portion 3 may be moved in the axial direction so as to be moved, so that a so-called dual motion mechanism for improving the relative opening speed may be used.

(3) In the first to third embodiments, the gas circuit breaker having the pressure accumulating space due to the mechanical action by the mechanism unit 11 is shown. However, the present invention includes the pressure accumulating space due to the mechanical action and the pressure accumulating due to the thermal energy action. The present invention can also be applied to a gas circuit breaker having a space.

DESCRIPTION OF SYMBOLS 1 Airtight container 2a, 2b Conductor 3 Fixed contact part 4 Movable contact part 5 Fixed arc contactor 6 Fixed energizing contactor 7 Movable cylinder 7a Through-hole 8 Movable arc contactor 9 Insulating nozzle 10 Movable energizing contactor 11 Mechanism part 12 Operation rod DESCRIPTION OF SYMBOLS 13 Sliding material 14 Multiram band contact 15 Base material 16 Ion implantation layer 17 Sliding surface 19 Piston 19a Piston support 20 Accumulation space 22 Insulating rod 23 Insulating cylinder 31 Fixed support 32 Support part 33 Support 33a Sliding part 34 Insulation support base

Claims (7)

In a gas circuit breaker, a sliding member for a gas circuit breaker disposed between members that are in contact with each other and are relatively slidable,
The sliding member has a base material, and an ion implantation layer formed by ion implantation into at least a part of the surface of the base material,
The sliding member for a gas circuit breaker, wherein the ion-implanted layer is formed by ion-implanting multivalent ions. The base material has a sliding surface that is slidably in contact with the relatively slidable member,
The ion implantation layer is formed on the base material surface including the sliding surface,
2. The sliding member for a gas circuit breaker according to claim 1, wherein the ion implantation layer on the sliding surface is thicker than the other portion of the ion implantation layer. The sliding member for a gas circuit breaker according to claim 1, wherein the thickness of the ion implantation layer is constant. The said ion implantation layer is formed in the whole surface of the said base material, The sliding member for gas circuit breakers of any one of Claims 1-3 characterized by the above-mentioned. The sliding member for a gas circuit breaker according to any one of claims 1 to 4, wherein the material of the base material is PTFE or PEEK. The said multivalent ion contains at least any 1 type in B (boron), BN (boron nitride), and C (carbon), The any one of Claims 1-5 characterized by the above-mentioned. A sliding member for a gas circuit breaker. A gas circuit breaker that opens and closes an electric circuit by switching energization or interruption,
A sealed container filled with arc-extinguishing gas;
A first arc contact and a second arc contact, which are disposed in the sealed container and in which the arc is generated by separating the two from each other in the interruption process;
A cylindrical cylinder disposed within the sealed container and having a bottom end surface;
A piston, which is a flat plate having an opening, fitted into the cylinder so as to face the one end surface;
An operating rod that slidably penetrates the opening and is inserted into the cylinder, and moves the cylinder;
A sliding member in which the cylinder or the operating rod is slidably disposed in a groove provided in at least one of the outer peripheral surface and the inner peripheral surface of the piston,
By moving the cylinder, accumulating the arc-extinguishing gas in the cylinder, generating a gas flow for extinguishing the arc,
The sliding member includes a base material and an ion implantation layer formed by implanting polyvalent ions into at least a part of the surface of the base material.

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