JP6045339B2 - Gas circuit breaker - Google Patents

Description

  The present invention relates to a gas circuit breaker.

  In electrical stations such as substations and switch stations, gas circuit breakers that extinguish arcs generated between contacts due to blowing of insulating gas are used. In such a gas circuit breaker, for example, as disclosed in Patent Document 1, a stationary contact and a movable contact are provided in a metal container filled with an insulating gas such as sulfur hexafluoride (SF6). Provided.

  The stationary contact is fixed to a mounting boss formed integrally with the container via a support insulator. More specifically, the fixed contact is fixed to one end side of the support insulator extending in a rod shape, and the other end side is fixed to the fixing boss. A through hole is formed in the fixed boss, and the support insulator is fixed to the fixing boss by screwing a bolt having a shaft portion through the through hole into the support insulator.

JP-A-6-96644

  When the fixed contact is fixed in the container, it is necessary to align the core with the movable contact. By moving the fixed contact with the bolt that fixes the support insulator to the fixing boss being loosened, the position of the fixed contact is finely adjusted and the centering is performed.

  When positioning the fixed contact, when the fixed contact is moved, the thread formed on the shaft of the fixing bolt contacts the inner surface of the through hole of the fixing boss, and the inner surface of the through hole is shaved. Metal foreign matter may be generated. If the generated metal foreign material leaks from the through hole, the metal foreign material may cause the insulation performance to deteriorate, resulting in a ground fault. Therefore, in addition to the fixing work of the fixed contact, it is necessary to check whether the metal foreign material is leaking or to clean the metal foreign material. However, the metal foreign material is surely found and cleaned in a limited space inside the container. There is a problem that it is difficult to do.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the gas circuit breaker which can suppress the generation | occurrence | production of a metal foreign material and can perform center alignment of a stationary contact.

  In order to solve the above-described problems and achieve the object, the present invention provides a container in which an insulating gas is sealed, a stationary contact provided in the container, and a movable contactable contact with the stationary contact in the container. A movable contact made possible, a support insulator fixed to the fixed contact, a fixing boss provided on the inner side surface of the container and having a through hole, and a threaded portion having an external thread are provided. A screw member that is passed through the through hole, and the support insulator is fixed to the fixing boss by the screw member, so that the position of the fixed contact in the container is fixed and formed in the screw member. It further comprises a contact restricting portion for restricting contact between the outer screw and the inner surface of the through hole.

  According to this invention, there is an effect that it is possible to obtain a gas circuit breaker capable of performing the centering of the stationary contact while suppressing the generation of metallic foreign objects.

FIG. 1 is a diagram schematically showing an internal configuration of the gas circuit breaker according to the first exemplary embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view in which the portion A shown in FIG. 1 is enlarged. FIG. 3 is a partial enlarged cross-sectional view in which a through hole portion according to Modification 1 of Embodiment 1 is enlarged. FIG. 4 is a partially enlarged cross-sectional view in which a through hole portion according to Modification 1 of Embodiment 1 is enlarged. FIG. 5 is a view showing the gas circuit breaker according to the second embodiment of the present invention, and is a partially enlarged cross-sectional view in which a portion corresponding to the portion A shown in FIG. 1 is enlarged. 6 is a diagram showing a gas circuit breaker according to a third embodiment of the present invention, and is a partially enlarged cross-sectional view in which a portion corresponding to the portion A shown in FIG. 1 is enlarged.

  Below, the gas circuit breaker concerning embodiment of this invention is demonstrated in detail based on drawing. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram schematically showing an internal configuration of the gas circuit breaker 50 according to the first embodiment of the present invention. The gas circuit breaker 50 is configured by providing a movable contact 1 and a fixed contact 2 in a metal container (grounding tank) 30 filled with an insulating gas such as sulfur hexafluoride (SF6).

  The movable contact 1 is provided so as to be able to reciprocate in the direction indicated by the arrow X within the container 30, and can be brought into and out of contact with the fixed contact 2 by the reciprocation. About the mechanism etc. which provide the movable contact 1 so that reciprocation is possible, what is necessary is just to employ | adopt a well-known structure, Therefore It abbreviate | omits about detailed description.

  The fixed contact 2 is fixed within the container 30 at a position where it can come into contact with and move away from the movable contact 1 as the movable contact 1 reciprocates. Here, the structure which fixes the stationary contact 2 to the container 30 is demonstrated in detail. FIG. 2 is a partially enlarged cross-sectional view in which the portion A shown in FIG. 1 is enlarged. The fixed contact 2 is fixed in the container 30 by a fixing boss 3, a support insulator 4, and a fixing bolt (screw member) 5.

  The fixing boss 3 is provided so as to protrude from the inner surface of the container 30. The fixing boss 3 may be formed integrally with the container 30, or may be formed separately from the container 30 and fixed to the inner surface of the container 30. A through hole 3 a is formed in the fixing boss 3.

  The support insulator 4 is a bent rod-shaped member as shown in FIG. 1 and is formed of an insulator. The fixed contact 2 is fixed to one end of the support insulator 4. A screw hole forming portion 6 in which a screw hole is formed is embedded in the other end of the support insulator 4.

  The fixing bolt 5 is a general bolt having a shaft portion (thread portion) 5a on which an external screw is formed, and a head portion 5b provided at one end of the shaft portion 5a. The other end of the support insulator 4 is fixed to the fixing boss 3 using a fixing bolt 5. In the state where the screw hole formed in the screw hole forming portion 6 and the through hole 3a formed in the fixing boss 2 are overlapped, the shaft portion 5a of the fixing bolt 5 is inserted into the through hole 3a from the opposite side of the support insulator 4. The support insulator 4 is fixed to the fixing boss 3 by screwing the shaft portion 5a into the screw hole. A washer 8 may be used as shown in FIG.

  A cylindrical insulator (contact restricting portion) 7 is inserted into the through hole 3a before allowing the shaft portion of the fixing bolt 5 to penetrate. The cylindrical insulator 7 is formed of an insulator and has a cylindrical shape. The outer diameter of the cylindrical insulator 7 is smaller than the inner diameter of the through hole 3 a of the fixing boss 3. Further, the inner diameter of the cylindrical insulator 7 is larger than the outer shape of the shaft portion 5 a of the fixing bolt 5, and the shaft portion 5 a can be penetrated inside the cylindrical insulator 7. Moreover, the length of the cylindrical insulator 7 is smaller than the depth P of the through hole 3a.

  By inserting the cylindrical insulator 7 into the through hole 3a, the cylindrical insulator 7 is interposed between the shaft portion 5a and the through hole 3a. As a result, even if the fixing bolt 5 is loosened and the fixed contact 2 is moved to align the center, the shaft portion 5a and the through hole 3a do not come into contact with each other. It is possible to prevent metal foreign matter from being generated by the unevenness.

  Moreover, even if the shaft insulator 5a and the cylindrical insulator 7 come into contact with each other and the cylindrical insulator 7 is scraped into a screw to generate scrap, it becomes scrap formed of an insulator. Therefore, even if the removal of the waste leaking out of the through hole 3a is insufficient, it is possible to make it difficult to cause a ground fault. Further, since the length of the cylindrical insulator 7 is smaller than the depth P of the through hole 3a, the cylindrical insulator 7 protrudes from the through hole 3a and is fixed to the head 5b of the fixing bolt 5 and the fixing bolt 5. It is possible to suppress the formation of a gap between the boss 3 and between the support insulator 4 and the fixing boss 3.

  FIG. 3 is a partial enlarged cross-sectional view in which a through hole portion according to Modification 1 of Embodiment 1 is enlarged. As shown in FIG. 3, a protrusion 3 b may be formed on the inner surface of the through hole 3 a as a stopper for the tubular insulator 7. By forming the protrusion 3b, the cylindrical insulating portion 7 jumps out of the through hole 3a, and between the head 5b of the fixing bolt 5 and the fixing boss 3, or between the support insulator 4 and the fixing boss 3. It can suppress more reliably that a clearance gap will be formed between them.

  Note that the region closer to the support insulator 4 than the fixing boss 3 is more visible than the region closer to the head 5b than the fixing boss 3 by being shaded by the fixing boss 3 and the support insulator 7. Therefore, it is difficult to remove the foreign matter leaked from the through hole 3a. Therefore, it is preferable that the protrusion 3b is formed on the support insulator 4 side with respect to the cylindrical insulator 7 rather than the head 5b side of the fixing bolt 5. When the protrusion 3b is formed on the support insulator 4 side, it is prevented that the protrusion 3b jumps out to the support insulator 4 side to form a gap with the fixing boss 3 and is generated in the through hole 3a. Since the foreign matter is caught by the protrusion 3b, the foreign matter is less likely to leak to the support insulator 4 side where visibility and workability are poor.

  FIG. 4 is a partially enlarged cross-sectional view in which a through hole portion according to Modification 1 of Embodiment 1 is enlarged. As shown in FIG. 3, irregularities may be formed on the outer surface of the cylindrical insulator 7 in accordance with the protrusions 3 b formed on the fixing boss 3 a.

  FIG. 5 is a view showing the gas circuit breaker 100 according to the second embodiment of the present invention, and is a partially enlarged cross-sectional view in which a portion corresponding to the portion A shown in FIG. 1 is enlarged. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  The fixing bolt (screw member) 9 provided in the gas circuit breaker 100 according to the second embodiment is a bolt having a head portion 10 and a shaft portion 11. The shaft portion 11 of the fixing bolt 9 has a cylindrical portion (contact restricting portion) 11a in which a screw is not formed on the outer peripheral surface, and a screw portion 11b in which an outer screw is formed on the outer peripheral surface. The cylindrical portion 11a is provided between the head portion 10 and the screw portion 11b. Further, the outer diameter R of the threaded portion 11b is smaller than the outer diameter Q of the cylindrical portion 11a.

  In a state where the support insulator 4 is fixed to the fixing boss 3 using the fixing bolt 9, the cylindrical portion 11a is accommodated inside the through hole 3a. Therefore, it is possible to prevent the unevenness of the screw formed on the screw portion 11b from coming into contact with the inner surface of the through hole 3a, and to suppress the generation of metal scraps.

  Further, since the outer diameter R of the screw portion 11b is smaller than the outer diameter Q of the cylindrical portion 11a, even if a part of the screw portion 11b enters the inside of the through hole 3a, the screw portion 11b is ahead of the screw portion 11b. The cylindrical portion 11a contacts the inner surface of the through hole 3a. Therefore, contact between the unevenness of the screw and the inner surface of the through hole 3a can be prevented, and generation of metal scraps can be suppressed.

  6 is a diagram showing a gas circuit breaker 150 according to Embodiment 3 of the present invention, and is a partially enlarged cross-sectional view in which a portion corresponding to the portion A shown in FIG. 1 is enlarged. In addition, about the structure similar to the said embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the third embodiment, the supporting insulator 4 is fixed to the fixing boss 3 using the full screw rod (screw member) 12 and the nut 13. The entire threaded rod 12 is provided with a threaded portion 12b having an outer thread formed on the outer peripheral surface thereof on both sides of a cylindrical portion (contact restricting portion) 12a on which the outer thread is not formed on the outer peripheral surface.

  Of the screw portions 12b provided on both sides of the cylindrical portion 12a, one screw portion 12b is screwed into the screw hole of the support insulator 4, and the nut 13 is attached to the other screw portion 12b, whereby the support insulator 4 is fixed. The fixed contact 2 is fixed in the container 30 by being fixed to the boss 3 for use. Note that the outer diameter T of the threaded portion 12b is smaller than the outer diameter S of the cylindrical portion 12a.

  The cylindrical portion 12 a is accommodated inside the through hole 3 a in a state where the supporting insulator 4 is fixed to the fixing boss 3 using the entire screw rod 12. Therefore, it is possible to prevent the unevenness of the screw formed on the screw portion 12b from coming into contact with the inner surface of the through hole 3a, and to suppress the generation of metal scraps.

  Further, since the outer diameter T of the screw portion 12b is smaller than the outer diameter S of the cylindrical portion 12a, even if a part of the screw portion 12b enters the inside of the through hole 3a, the screw portion 12b is ahead of the screw portion 12b. The cylindrical portion 12a contacts the inner surface of the through hole 3a. Therefore, contact between the unevenness of the screw and the inner surface of the through hole 3a can be prevented, and generation of metal scraps can be suppressed.

  In addition, you may form the screw part 12 and the cylindrical part 12a for attaching the nut 13 to screw hole formation part 6 itself, without forming a screw hole in the screw hole formation part 6 embedded in the support insulator 4. FIG. . In this case, the screw hole forming portion 6 functions as a screw member. Also, a cylindrical insulator 7 as shown in FIG. 2 is inserted between the cylindrical portions 11a, 12a and the through hole 3a shown in FIG. 5 and FIG. It doesn't matter.

  As described above, the gas circuit breaker according to the present invention is useful for a gas circuit breaker including a movable contact and a fixed contact.

  1 movable contact, 2 fixed contact, 3 fixing boss, 3a through hole, 3b protrusion, 4 support insulator, 5 fixing bolt (screw member), 5a shaft (screw), 5b head, 6 Screw hole forming part, 7 Cylindrical insulator (contact restricting part), 8 Washer, 9 Fixing bolt (screw member), 10 Head, 11 Shaft part, 11a Cylindrical part (contact restricting part), 11b Screw part, 12 Full screw rod (screw member), 12a cylindrical part (contact restricting part), 12b screw part, 13 nut, 30 container, 50, 100, 150 gas circuit breaker.

Claims (3)

A container filled with insulating gas;
A stationary contact provided in the container;
A movable contact which is movable in the container so as to be capable of moving toward and away from the fixed contact;
A support insulator fixed to the stationary contact;
A fixing boss provided on the inner surface of the container and having a through hole formed thereon;
A screw member provided with a thread portion in which an external screw is formed and passed through the through hole, and
By fixing the support insulator to the fixing boss by the screw member, the position of the fixed contact in the container is fixed,
A contact restricting portion for restricting contact between an external screw formed on the screw member and an inner surface of the through hole ;
A screw hole into which the screw portion is screwed is formed in the support insulator,
The screw member is a bolt having a shaft portion and a head portion on which an external screw is formed,
It said contact restricting portion, the while being inserted into the through hole, a gas circuit breaker according to claim cylindrical insulator der Rukoto exhibiting insertable tubular shape the shaft portion. Wherein the inner peripheral surface of the through hole, a gas circuit breaker according to claim 1, characterized in that projections for preventing detachment of the cylindrical insulator is formed. 3. The gas circuit breaker according to claim 2 , wherein the protrusion is formed closer to the support insulator than the cylindrical insulator.

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