JPH1173860A - Contactor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactor getting little wear by a large current when it is miniaturized at a large capacity and having high reliability and safety and to provide its manufacturing method. SOLUTION: The moving conductive contactor X of a gas blast circuit breaker is constituted of a contactor main body section 23 and a contact section 22 connected to its end section. The whole moving conductive contactor X is formed into a pipe shape. The contactor main body section 23 is made of aluminum, and the contact section 22 is made of copper. The connection portion of the contactor main body section 23 and the contact section 22 is formed into an tonque-and-grucove insert shape. The copper contact section 22 side is machined into a recessed shape in advance, and the aluminum contactor main body section 23 is connected to the recess by friction welding. A connection surface of the contactor main body section 23 and the contact section 22 is provided at a position apart from a contact section T with a fixed conductive contactor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker or disconnector for civil use, or a circuit breaker or disconnector for power used in a power plant or a substation, for example, which is connected to each other in order to cut off current. The present invention relates to a detachably provided contact and a method of manufacturing the same.

[0002]

2. Description of the Related Art Power gas circuit breakers installed in power plants and substations are used for shutting off power in an emergency such as an earthquake or a fire, so that excellent safety is required. In addition, high reliability is required. The general structure of such a power gas circuit breaker will be described below with reference to FIGS. That is, FIG.
As shown in FIG. 2, an arc-extinguishing chamber 3 is housed in a container 2 filled with an insulating gas. The arc-extinguishing chamber 3 includes a fixed portion 4 and a movable portion 5 that are arranged to face each other.

[0003] The fixed portion 4 includes a fixed current-carrying contact 6, a fixed arc contact 7, a fixed-side shield 8, and a fixed support 9 for supporting these components. On the other hand, the movable part 5 is a movable energizing contact 1 for applying a normal current.
0, a movable arc contact 11, an insulating nozzle 12, an operating rod 13, and a puffer cylinder 14. The movable part 5 is held by a supporting insulating cylinder 15, a movable support 16 and a puffer piston 17.
And a puffer piston 17 constitute a compression chamber.

[0004] The movable support 16 is connected to the fixed portion 4 via an inter-electrode insulating cylinder 18. Then, the movable energizing contact 10, the movable arc contact 11, and the insulating nozzle 12
Is connected to an operation mechanism (not shown) via the operation rod 13. The movable energizing contact 10 is generally light-weight so that current can always flow when the circuit breaker is turned on and can be quickly operated in the open / close operation state of the circuit breaker. And is formed of a single material of aluminum having high conductivity.

Further, the stationary arc contact 7 and the movable arc contact 11 have a large energizing current value in a stationary state in the power gas circuit breaker, and therefore the stationary energizing contact 6 and the movable energizing contact which are the energizing electrodes. In addition to the set of contacts 10, another set of current interrupting electrodes is further provided. Then, the fixed part 4 and the movable part 5 as described above
Are connected to conductors 19 and 20, respectively, and are connected to lines and other devices via these conductors 19 and 20.

[0006] The current interruption operation of the electric power gas circuit breaker having the above configuration is performed as follows. First, as shown in FIG. 12, when the gas circuit breaker 1 is in a closed state, that is, in a current-carrying state, a current flows through the conductor 19, the fixed support 9,
The electric current flows from the movable energizing contact 10, the puffer cylinder 14, and the movable support 16 through the conductor 20 via the fixed energizing contact 6. When the current is interrupted in an emergency, FIG.
As shown in FIG. 3, since the operating rod 13 is pulled by the operating mechanism in the direction of the arrow (right side in the figure), the fixed energizing contact 6 and the movable energizing contact 10 are separated from each other, and the fixed support 9, the fixed energizing contact 6, the current flowing to the movable energizing contact 10 and the puffer cylinder 14 changes the flow path from the fixed support 9 to the puffer cylinder 14 via the fixed arc contact 7 and the movable arc contact 11.

Next, as shown in FIG. 14, when the movable part 5 further moves in the direction of the arrow (right side in the figure) by the operating mechanism, and the fixed arc contact 7 and the movable arc contact 11 separate, Fixed arc contact 7 and movable arc contact 1
An arc 21 is generated between the two. The gas compressed by the puffer cylinder 14 and the puffer piston 17 is blown to the arc 21 thus generated through the insulating nozzle 12. As a result, arc 2
1 is cooled and extinguished, and the interruption of the current is completed. By completely interrupting the current in this way, the circuit breaker 1 is in an open state as shown in FIG.

Meanwhile, in recent years, the power gas circuit breaker has been required to be reduced in size from the viewpoint of effective use of resources and effective use of land as the capacity of the gas breaker for electric power has been increased with the increase in demand for electric power. I have. The increase in capacity and miniaturization of such a gas circuit breaker tends to increase the absolute value of the energizing current and the energizing current density during steady operation, and at the same time, increases the absolute value of the interrupting current and the interrupting current density. I have. That is, in the case of the gas circuit breaker having the above-described configuration, the current flowing through the fixed energizing contact 6, the fixed arc contact 7, the movable energizing contact 10, and the movable arc contact 11 increases due to the increase in capacity and miniaturization. Become.

Further, when downsizing the gas circuit breaker, it is necessary to reduce the number of contacts between the fixed energizing contact 6 and the movable energizing contact 10 due to space restrictions. In this case, the current density per point increases, and the load on the material used increases. However, when the load increases in this way, for example, since the general movable energizing contact 10 is made of aluminum as a single material as described above, the fixed energizing contact 6 and the movable energizing contact 10 By the minute arc that occurs when leaving,
The vicinity of the contact point is easily melted. The erosion portion increases with an increase in the number of opening and closing operations, so that the current interrupting characteristic at the time of opening decreases as the use period elapses.
This tendency becomes greater as the shape of the current-carrying contact becomes smaller. In order to cope with this, it is conceivable to use a material having a higher conductivity and a higher melting point than aluminum, such as copper, as the material of the current-carrying contact.

If the gas circuit breaker is downsized and the capacity is increased, the arc 21 generated between the fixed arc contact 7 and the movable arc contact 11 at the time of current interruption is reduced.
Energy and energy density also increase. For this reason, as a material of the fixed arc contact 7 and the movable arc contact 11, it is necessary to use a good arc resistant material that can withstand the arc 21 of a large energy, for example, a copper-tungsten alloy. Generally, for each contact portion of the fixed arc contact 7 and the movable arc contact 11, an arc-resistant copper-tungsten alloy is used,
A copper-chromium alloy is used for the contact body other than the contact part. Then, the contact portion and the contact body are joined by silver brazing.

[0011]

However, the above-mentioned current-carrying contacts and arc contacts have the following problems. That is, when copper is used instead of aluminum as the material of the movable energizing contact 10, the weight of the movable portion 5 increases, and quick operation becomes difficult. For this reason, it is necessary to increase the driving force of the operating mechanism. However, with such a configuration, the operating mechanism is increased in size, so that the overall size of the gas circuit breaker cannot be reduced.

Further, the contact portions of the fixed arc contact 7 and the movable arc contact 11 and the contact main body are joined by the silver brazing as described above. For this reason, despite the fact that the electrical resistance of the joining portion is three times as large as that of the copper-tungsten alloy, the melting point of the silver solder is as small as one half of that of the copper-chromium alloy. May be melted, and the contact portion may come off from the contact body, which is problematic from the viewpoint of safety and reliability. In particular, when the size and the capacity are increased, the silver brazing at the joining portion is easily melted by the high heat generated by the high-current arc 21 when the fixed arc contact 7 and the movable arc contact 11 are separated from each other. It was difficult to increase the capacity.

The present invention has been proposed to solve the above-mentioned problems of the prior art. The object of the present invention is to reduce the wear of the contacts due to a large current even when the size and the capacity are increased. An object of the present invention is to provide a highly reliable and safe contact and a method for manufacturing the same.

[0014]

In order to achieve the above-mentioned object, the present invention is directed to a contact body which is provided so as to be movable in a direction in which at least one of the contact body portions opposed to each other comes into contact with or separates from the other. The contact element in which at least one of the opposing ends of the portion is joined to a contact portion that contacts and separates from the other end has the following technical features.

That is, in the first aspect of the present invention, the contact body and the contact are formed of different materials, and the contact body and the contact are joined by fitting. It is characterized by being. According to the first aspect of the present invention, the contact portion is formed of a material different from that of the contact body, for example, a material having a higher melting point and conductivity than the contact body, thereby reducing the amount of wear of the contact portion. It is possible to achieve a long life by reducing the length. In addition, since the contact body and the contact portion have a fitting structure, they are not separated from each other even in the case of a shock or a high temperature, so that safety and reliability can be maintained.

According to a second aspect of the present invention, in the contact according to the first aspect, a fitting portion between the contact body and the contact portion has an inner cross-sectional area larger than a cross-sectional area of an entrance of a fitting hole. Is formed large. According to a third aspect of the present invention, in the contact according to the first aspect, a fitting portion between the contact body and the contact portion is inclined from the entrance of the fitting hole to the inside. And Claims 2 and 3 as described above
In the described invention, safety and reliability are further improved due to the difference in cross-sectional area of the uneven portion of the fitting or the inclination of the uneven portion, which does not separate even by impact or high temperature that greatly exceeds the design value, and .

According to a fourth aspect of the present invention, there is provided the contact according to any one of the first to third aspects, wherein an entrance portion of a fitting hole is formed in a joint portion between the contact body and the contact portion. It is characterized in that both joint surfaces on the side are inclined. According to the fourth aspect of the present invention, since the contact surface between the contact body and the contact portion is inclined, the joint area is increased. Therefore, the tensile strength is improved,
Increases reliability.

According to a fifth aspect of the present invention, there is provided the contact according to any one of the first to fourth aspects, wherein one of the contacts provided so as to be able to contact and separate from each other has a pipe shape or a rod shape. There is a feature. According to the fifth and sixth aspects of the present invention, the same effect as that of the first to fourth aspects can be obtained by a contact having a shape suitable for interrupting current as in the related art.

According to a seventh aspect of the present invention, in the contact according to any one of the first to fourth aspects, one of the contacts provided so as to be able to contact and separate from each other is brought into contact with the other contact. It is characterized by a cracked pipe shape whose diameter changes. According to the seventh aspect of the present invention, since the diameter of the pipe-shaped contact changes due to the contact with the other contact, the impact at the time of the contact is reduced.

According to an eighth aspect of the present invention, in the contact according to any one of the first to seventh aspects, the bonding material between the contact body and the contact is copper, aluminum, iron,
It is characterized by being at least one of a copper alloy, an aluminum alloy, an iron alloy and a copper-tungsten alloy. In the invention according to claim 8 described above, the electric resistance of the joining portion is lower and the melting point is higher than when silver solder is used for joining the contact body and the contact portion. Thus, the contact portion does not melt, and the contact portion can be prevented from coming off.

According to a ninth aspect of the present invention, in the contact according to any one of the first to eighth aspects, the contact body is made of aluminum or an aluminum alloy, and the contact is made of copper or a copper alloy. Characterized by being formed by According to the ninth aspect of the present invention, since the contact body is made of lightweight aluminum or the like, a contact suitable for a movable contact can be formed. In addition, since the contact portion is made of copper or the like having a higher melting point and higher conductivity than aluminum, wear of the contact can be reduced.

According to a tenth aspect of the present invention, in the contact according to any one of the first to eighth aspects, the contact body is made of iron, an iron alloy or a copper alloy, and the contact is made of copper. -It is characterized by being formed of a tungsten alloy. In the tenth aspect of the present invention, the contact is suitable for the arc contact because it is formed of a material having excellent arc resistance.

According to an eleventh aspect of the present invention, the electrical resistance of the junction between the contact body and the contact is equal to the electrical resistance of the contact body or the contact. . In the eleventh aspect of the present invention, since the electrical resistance of the junction between the contact body and the contact portion is equal to that of the other portions, the heating of the junction is prevented and the fitting strength of the contact portion is prevented. Can be prevented from decreasing.

The twelfth aspect of the present invention is the first aspect of the present invention.
In the contact according to any one of the above, a joint portion between the contact body and the contact portion is provided at a position separated from a contact portion of the contact portion with the other contact. It is characterized by the following. According to the twelfth aspect of the present invention, since the joint is separated from the contact portion with the other contact, it is possible to prevent the influence of the heat of the arc generated at the time of opening and closing from being applied to the joint. It is possible to prevent the fitting strength of the contact portion from decreasing.

The invention according to claim 13 is the invention according to claims 1 to 12
3. The method for manufacturing a contact according to claim 1, wherein the contact body and the contact are joined by friction welding. Claim 13 as described above.
In the described invention, the contact body and the contact portion, which are dissimilar metals, are joined by friction welding that is suitable for welding different materials and that can be joined at high speed and with high precision, High-strength bonding can be reliably performed.

[0026]

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

(1) First Embodiment Claims 1, 5, 8, 9 and 11 to 11
An embodiment corresponding to the invention described in 3 will be described with reference to FIGS. That is, as shown in FIG. 1, in the present embodiment, the movable energizing contact X of the gas circuit breaker is constituted by a contact body 23 and a contact portion 22 joined to an end thereof. As shown in FIG. 2, the movable energizing contact X is formed in a pipe shape as a whole, and the tip of the contact portion 22 is a contact portion T with a fixed energizing contact (not shown). The contact body 23 is made of aluminum, and the contact 22 is made of copper.

The joint between the contact body 23 and the contact portion 22 has an uneven fitting shape. For this joining, a concave shape is previously formed on the contact portion 22 side, and the aluminum contact body 23 is formed on the concave portion.
By friction welding. With friction welding, the base materials to be joined are butt-jointed and, while being pressurized, rotate relatively to one base material to generate frictional heat,
This is a method in which the relative motion is stopped when the butting surface and the vicinity thereof reach a sufficient temperature rise for joining. It is desirable that the temperature of the base material at the time of this joining be a temperature at which diffusion joining can be performed by utilizing diffusion of atoms generated between joining surfaces. In addition, the joint surface S between the contact body 23 and the contact part 22 is provided at a position separated from the contact part T with the fixed energizing contact.

According to the above-described embodiment, copper having a higher melting point and higher conductivity than aluminum is used for the contact portion 22 of the movable energizing contact X, so that a single material of aluminum can be used. Compared with the conventional example, the amount of wear can be greatly reduced, and the life can be extended. FIG. 3 shows the results of a comparison test of the amount of wear between the conventional example and the present embodiment. From the test results, it was found that the movable contact X of the present embodiment can reduce the amount of wear to about 1/3 of the conventional example.

Since copper is used only for the contact portion 22 and the contact body 23 is made of lightweight aluminum, the movable contact X can be smoothly opened and closed. Therefore, it is not necessary to increase the driving force of the operation mechanism, and the size of the operation mechanism and the size of the entire gas circuit breaker can be reduced.

Further, since the contact portion 22 and the contact body 23 have a fitting structure instead of joining by silver brazing, they are separated even if an impact is applied or the temperature becomes high. Never. Therefore, miniaturization and large capacity can be achieved while maintaining safety and reliability.

Further, since the joint surface S between the contact body 23 and the contact portion 22 is provided at a position separated from the contact portion T with the fixed current-carrying contact, the influence of a minute arc at the time of opening and closing is reduced. Hard to receive. Accordingly, it is possible to prevent the diffusion bonding layer from growing and becoming thicker due to the heat of the arc, thereby reducing the bonding strength.

Further, since no silver brazing or the like is interposed at the joint between the contact body 23 and the contact portion 22, the electric resistance of the joint becomes equal to that of other parts. Therefore, it is possible to prevent the bonding portion from being heated during the energization and the diffusion bonding layer from growing to lower the bonding strength.

Further, since the contact body 23 and the contact portion 22 formed of different materials are joined by a friction welding method which enables high-speed and high-accuracy joining of different materials, they are joined by silver brazing. Therefore, the bonding can be performed with higher strength, and the bonding can be easily automated, so that the manufacturing efficiency is improved. In particular, if the diffusion bonding is performed as described above, it is possible to manufacture a contact with less deformation, higher precision and higher quality.

(2) Second Embodiment An embodiment corresponding to the invention described in claim 2 will be described with reference to FIG.
This will be described below with reference to (A) and (B). That is, according to the present embodiment, the shape of the fitting of the joint between the contact body 23 and the contact portion 22 in the first embodiment is smaller than the diameter m of the entrance of the fitting hole, the inner diameter n. Is larger, that is, the inner cross-sectional area is larger than the cross-sectional area of the entrance. This joining is performed as shown in FIG.
A concave part whose inside is enlarged, or FIG.
As shown in (B), the contact portion 22 is formed by forming a concave portion whose inside is enlarged and joining by the friction welding method as described above. The other configuration is the same as that of the first embodiment.

According to the present embodiment as described above, the first
The same operation and effect as those of the embodiment can be obtained, and since the inner cross-sectional area is formed to be larger than the cross-sectional area at the entrance of the fitting, an impact that greatly exceeds the design value is applied. Even if the contact portion 22 becomes hot, the detachment of the contact portion 22 is reliably prevented, and the safety and reliability are further improved.

(3) Third Embodiment An embodiment corresponding to the invention described in claim 3 will be described with reference to FIG.
This will be described below with reference to (A) and (B). That is, in the present embodiment, the shape of the fitting of the joint between the contact body 23 and the contact portion 22 in the first embodiment is inclined with respect to the axis from the entrance of the fitting hole to the inside. It is formed as follows. This joining is performed by forming a concave portion having an inclined inside in the contact body 23 as shown in FIG. 5 (A), or by forming the contact portion 2 as shown in FIG. 5 (B).
This is performed by forming a concave portion having an inclined inside in 2 and joining by a friction welding method as described above. The other configuration is the same as that of the first embodiment.

According to the present embodiment as described above, the first
The same effects as those of the embodiment can be obtained, and the shape of the fitting is formed so as to be inclined from the entrance to the inside. , The contact portion 22 is reliably prevented from coming off, and the safety and reliability are further improved.

(4) Fourth Embodiment An embodiment corresponding to the invention described in claim 4 will be described with reference to FIG.
This will be described below with reference to (A) and (B). That is, in the present embodiment, the joint surface S at the joint between the contact body 23 and the contact portion 22 in the first embodiment is formed to be inclined. The joining method and other configurations are the same as those in the above embodiment. According to the present embodiment as described above, the same operation and effect as those of the first embodiment can be obtained, and the joining area is increased and the tensile strength is improved. Safety and reliability can be ensured by preventing disengagement.

(5) Fifth Embodiment An embodiment corresponding to the inventions described in claims 6 to 8 and 10 to 13 will be described below with reference to FIGS.
That is, as shown in FIG. 7, in the present embodiment, the fixed arc contact Y of the gas circuit breaker is constituted by the contact body 26 and the contact 25 joined to the end thereof. The fixed arc contact Y is formed in a bar shape as a whole, and the tip of the contact portion 25 is a contact portion V with the movable arc contact Z (shown in FIGS. 8 and 9).

The movable arc contact Z comprises a contact body 28 and a contact 27 joined to an end thereof. As shown in FIG. 9, the movable arc contact Z is entirely formed in a pipe shape, and the tip of the contact portion 27 is a contact portion W with the fixed arc contact Y. The movable arc contact Z has a plurality of vertical slits formed from the tip thereof.

The contact body portions 26 and 28 of the arc contacts Y and Z are formed of a copper-chromium alloy, and the contact portions 25 and 27 are formed of an arc-resistant copper-tungsten alloy. As shown in FIG. 6, the joint portions between the contact body portions 26 and 28 and the contact portions 25 and 27 have a concave and convex fitting shape. This joining is performed by the friction welding method as in the first embodiment. The contact surface S between the contact body portions 26 and 28 and the contact portions 25 and 27 is
It is provided at a position separated from the contact portions V and W with the fixed energizing contact.

According to this embodiment as described above, the contact portions 25 of the fixed arc contact Y and the movable arc contact W,
Since the contact 27 and the contact body portions 26 and 28 are joined by a fitting structure, a longer life can be realized as compared with the case of the conventional example in which silver is brazed. FIG. 1 shows the results of the large current switching test of such a conventional example and the present embodiment.
0 is shown. From this test result, it was found that the arc electrode according to the present embodiment has a life about four times that of the conventional example.

The contact portions 25 and 27 and the contact body 2
6 and 28 are joined not by silver brazing but by fitting, so that even if a shock is applied or the temperature becomes high, they are not separated. Therefore,
It is possible to reduce the size and increase the capacity while maintaining safety and reliability.

The contact body portions 26 and 28 and the contact portion 2
Since the joint surface S with the contact portions 5 and 27 is provided at a position separated from the contact portions V and W, the joint surface S is hardly affected by the arc at the time of opening and closing. Accordingly, it is possible to prevent the diffusion bonding layer from growing and becoming thicker due to the heat of the arc, thereby reducing the bonding strength.

Since no silver brazing or the like is interposed between the contact portions of the contact body portions 26 and 28 and the contact portions 25 and 27,
The electrical resistance of the joint becomes equal to that of other parts. Therefore,
The junction is heated during energization, preventing the diffusion bonding layer from growing and the bonding strength from being reduced.

Further, since the contact body portions 26 and 28 and the contact portions 25 and 27 formed of different materials are joined by the friction welding method which enables joining of dissimilar materials at high speed and high accuracy. An effect similar to that of the first embodiment can be obtained.

(6) Other Embodiments The present invention is not limited to the above embodiments, and the shape, material, etc. of each member can be appropriately changed. For example, the contact body 2 in the movable energizing contact X described above.
As shown in FIG. 11A, the fitting shape of 3 and the contact portion 22 may be such that a convex portion is formed on the contact portion 22 side, and a plurality of concave portions are formed as shown in FIG. It may be formed. In addition, fixed arc contact Y and movable arc contact Z
Contact body portions 26 and 28 and contact portions 25 and 27
Various shapes are conceivable as shown in FIGS. 4 to 5 and FIG.

The same operation and effect as in the first embodiment can be obtained even if the contact portion 22 of the movable contact X is made of a copper alloy and the contact body 23 is made of an aluminum alloy. Then, even if the contact body portions 26 and 28 of the fixed arc contact Y and the movable arc contact Z are formed of iron or an iron alloy, the same operation and effect as in the fifth embodiment can be obtained.

Further, the above embodiments can be freely combined. For example, any one of the energizing contacts of the first to fourth embodiments and the arc contact of the fifth embodiment can be used. When a gas circuit breaker is provided, the performance of the gas circuit breaker can be dramatically improved, and downsizing and large capacity can be easily achieved. Further, the uneven shape of the bonding portion in the above-described embodiment may be a combination of those shown in FIGS. 4, 5, and 11 and those shown in FIG. And, the present invention is not limited to the current-carrying contacts and arc contacts of the gas circuit breaker for electric power, and can be applied to other contacts, even if it is generally called an electrode. The same can be applied as long as it has the same function as the contact of the present invention.

[0051]

As described above, according to the present invention, even if the size and the capacity are increased, the contact is not worn away by a large current, and the contact and the method for manufacturing the same are highly reliable. can do.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a contact according to the present invention.

FIG. 2 is a plan view showing the embodiment of FIG.

FIG. 3 is a graph showing a comparison of the amount of wear between the first embodiment of the contact of the present invention and a conventional energized contact.

FIG. 4 is a longitudinal sectional view showing a joint portion between a contact body and a contact portion according to a second embodiment of the contact of the present invention;
(A) is a case where the contact portion side is convex, and (B) is a case where the contact portion side is concave.

FIG. 5 is a longitudinal sectional view showing a joint portion between a contact body and a contact portion in a third embodiment of the contact of the present invention;
(A) is a case where the contact portion side is convex, and (B) is a case where the contact portion side is concave.

FIG. 6 is a longitudinal sectional view showing a joint portion between a contact body and a contact portion according to a fourth embodiment of the contact of the present invention;
(A) is a case where the contact portion side is convex, and (B) is a case where the contact portion side is concave.

FIG. 7 is a vertical sectional view showing a fixed arc contact according to a fifth embodiment of the present invention.

FIG. 8 is a side view showing a movable arc contact according to a fifth embodiment of the contact of the present invention.

FIG. 9 is a plan view showing a movable arc contact in the embodiment of FIG.

FIG. 10 is a diagram showing a graph comparing a fifth embodiment of the contact of the present invention with a conventional current-carrying contact in a large current switching test.

FIG. 11 is a vertical cross-sectional view showing a joint portion between a contact body and a contact portion in another embodiment of the contact of the present invention;
(A) is a case where the contact portion side is convex, and (B) is a case where the contact portion side is concave.

FIG. 12 is a sectional view showing a general power gas circuit breaker.

13 is a cross-sectional view showing a state in which a current-carrying contact is cut off in the power gas circuit breaker of FIG.

FIG. 14 is a cross-sectional view showing a state in which an arc contact is cut off in the power gas circuit breaker of FIG.

FIG. 15 is a cross-sectional view showing a state in which a current is completely cut off in the power gas cut-off circuit device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electric power gas circuit breaker 2 ... Container 3 ... Arc extinguishing chamber 4 ... Fixed part 5 ... Movable part 6 ... Fixed energizing contact 7, Y ... Fixed arc contact 8 ... Fixed side shield 9 ... Fixed support 10, X ... Movable energizing contact 11, Z: Movable arc contact 12: Insulating nozzle 13: Operating rod 14: Puffer cylinder 15: Supporting insulating cylinder 16: Movable support 17: Puffer piston 18: Inter-electrode insulating cylinder 19, 20: Conductor 21 Arc 22, 25, 27 ... contact part 23, 26, 28 ... contact body part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takeshi Shinkai 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant

Claims (13)

[Claims] At least one of the opposed contact body portions is provided so as to be movable in a direction of coming into contact with and separated from the other, and at least one of the opposed end portions of the contact body portion and the other end portion of the contact body portion. In the contact in which the contact parts to be brought into contact with each other are joined, the contact body and the contact part are formed of different materials, and the contact body and the contact part are joined by fitting. Contact. 2. A fitting portion between the contact body and the contact portion has a larger internal cross-sectional area than a cross-sectional area at an entrance of a fitting hole. Contact. 3. The contact according to claim 1, wherein the fitting portion between the contact body and the contact portion is inclined from the entrance of the fitting hole to the inside. 4. The joint portion between the contact body and the contact portion, wherein both joint surfaces on the entrance side of the fitting hole are inclined. 2. The contact according to item 1. 5. The contact according to claim 1, wherein one of the contacts provided so as to be able to contact and separate from each other has a pipe shape. 6. The contact according to claim 1, wherein one of the contacts provided so as to be able to contact and separate from each other has a rod shape. 7. One of the contacts provided so as to be able to contact and separate from each other has a cracked pipe shape whose diameter changes by contact with the other contact.
A contact according to any one of the preceding claims. 8. A bonding material for connecting the contact body and the contact portion is at least one of copper, aluminum, iron, copper alloy, aluminum alloy, iron alloy and copper-tungsten alloy. The contact according to claim 1. 9. The contact body according to claim 1, wherein the contact body is made of aluminum or an aluminum alloy, and the contact part is made of copper or a copper alloy. Contact. 10. The contact body according to claim 1, wherein the contact body is made of iron, an iron alloy, or a copper alloy, and the contact is made of a copper-tungsten alloy. 4. The contact according to 1. 11. The electrical resistance of a junction between the contact body and the contact portion is equal to the electrical resistance of the contact body or the contact portion.
A contact according to any one of the preceding claims. 12. The contact portion between the contact body and the contact portion is provided at a position separated from a contact portion of the contact portion with the other contact. 12. The contact according to any one of 1 to 11. 13. The method according to claim 1, wherein the contact body and the contact are joined by friction welding. Manufacturing method.