KR100323559B1 - Gas insulation switch - Google Patents

Abstract

An object of the present invention is to secure a seal performance, to prevent deterioration of insulation performance, to reduce operating energy, and to obtain a gas insulation switch having high reliability and low cost. In order to solve this problem, the gas insulated switchgear of the present invention has a length S1 or more corresponding to a stroke when the operating shaft 13 reciprocates the length of the seal portion 15 through which the operating shaft 13 penetrates. It is done. In addition, by providing a sliding member such as the wear ring 22, the guide portion 26, and the like, the lateral load and the frictional force are reduced, and air and foreign matter are prevented from entering.

Description

Gas Insulated Switchgear {GAS INSULATION SWITCH}

The present invention relates to a gas insulated switchgear.

As a conventional gas insulated switchgear, for example, as shown in Japanese Patent Laid-Open No. 9-63425, insulation for driving a fixed side contactor, a movable side contactor, a buffer cylinder movable part, a movable side contactor and a buffer cylinder movable part in a metal container is disclosed. A link mechanism having a rod is provided, the contact rod is opened or closed by pushing or pulling the insulating rod in the longitudinal direction through a drive shaft penetrating the partition wall of the metal container, and a seal case is provided at the partition wall portion through which the drive shaft penetrates. The metal container inner part of the seal case is supported by a member called a guide while being slidably supported and covered. This guide is intended to prevent the fluoride from infiltrating into the seal casing at the time of opening, to prevent the occurrence of bending force applied to the operating shaft, to suppress the increase of the friction force, and to prevent the decrease in the opening and closing speed.

In a gas insulated switchgear, it is necessary to penetrate the operation shaft (operation rod, drive shaft) for operating a movable contact to the container which filled gas, and ensuring airtightness in this penetration part becomes an important problem.

In the latter gas insulated switchgear, an airtightness is ensured by providing a partition wall seal case through which the operation shaft (drive shaft) penetrates. However, in this structure, when the operating shaft moves reciprocally, when the portion of the operating shaft that comes into contact with air moves outside into the container, the gas in the container contacts the air, and as a result, the gas component changes or There is a fear that the insulation is deteriorated. In addition, the guide provided on the partition wall of the operating shaft (drive shaft) penetrating portion is designed to prevent the infiltration of fluoride into the seal case and to prevent the occurrence of bending force applied to the operating shaft, but the airtightness is not considered. The work process for them also increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas insulated switchgear with high reliability, which can prevent contact between the insulating gas and air when the operation shaft moves in and out of the container.

A first feature of the present invention for achieving the above object is a container filled with an insulating gas, a fixed contactor provided in the container and a movable contactor provided to be in contact with the fixed contactor; In the gas insulated switchgear provided with the operation shaft to drive and the seal part which the said operation shaft penetrates provided in the said operation shaft penetrating part of the said container, WHEREIN: The length of the said operation shaft penetrating direction of the said seal part is reciprocated by the said operation shaft. It is in more than one stroke.

And preferably the vessel has a tank and an instrument case, the movable contactor is coupled to a nozzle and a buffer cylinder, the operation shaft passes through the instrument case and one side is connected to the manipulator, and the other side links the link mechanism. It is connected to the movable contact via, the seal portion is attached to the penetrating portion of the instrument case as a separate member from the instrument case, and arranged at least two seal members at intervals in the direction of the operating shaft penetrating the seal portion The interval is at least the stroke of the operating shaft reciprocating motion.

The second aspect of the present invention is a container in which insulating gas is enclosed, a contact-separable contactor provided in the container, an operation shaft for driving the contactor through the container, and the operation shaft penetrating portion of the container. In the gas insulated switchgear provided with the seal part which the said operation shaft penetrates, the length of the said operation shaft penetrating direction of the said seal part is made more than the distance close to the stroke of the said operation shaft reciprocating movement, and along the circumferential direction to the inner peripheral surface of the said seal part. The gap is provided.

Preferably, at least two seal members are disposed at intervals in the operating shaft penetrating direction, and the gap portion is formed between the two seal members over the entire circumferential direction.

According to a third aspect of the present invention, there is provided a container in which insulating gas is enclosed, a contact detachable contactor provided in the container, an operation shaft for driving the contactor through the container, and being provided in the operation shaft penetrating portion of the container. In the gas insulated switchgear provided with the seal | sticker part which the said operation shaft penetrates, the length of the said operation shaft penetration direction of the said seal part shall be more than the distance close to the stroke of the said operation shaft reciprocating motion, and a bearing member may be provided in the inner peripheral surface of the said seal part. It arrange | positions and supports the said operation shaft.

And preferably at least two seal members are spaced apart in the operating shaft penetration direction of the seal portion, and the gap portion is formed over the entire circumferential direction between the two seal members, and the bearing member A wear ring having a low sliding resistance is used to be located in the gap portion.

A fourth feature of the present invention is a container encapsulated with an insulating gas, a fixed contactor provided in the container, a movable contactor provided in contact with the fixed contactor, an operation shaft for driving the movable contactor through the container; A gas insulated switchgear having a seal portion through which the operating shaft penetrates while being provided as a separate member in the operating shaft penetrating portion of the container, wherein the seal portion protrudes outward from the container beyond a stroke of the operating shaft reciprocating motion. To form a sliding surface with the operation shaft, and to be detachably attached to the container.

A fifth aspect of the present invention is a container encapsulated with an insulating gas, a fixed contactor provided in the container, a movable contactor provided in contact with the fixed contactor, an operation shaft for driving the movable contactor through the container; In the gas insulated switchgear provided with the linkage which connected the insulating rod and the lever, and the seal part which is provided in the said operation shaft penetrating part of the said container, and the said operation shaft penetrates, The length of the said seal part in the said operation shaft penetrating direction is provided. At least a distance close to the stroke of the operation shaft reciprocating motion, the link mechanism connects the insulating rod to the movable contact side and the lever to the operating shaft side, and is arranged in the order of the movable contactor, the insulating rod, and the lever from above. It is in one place.

A sixth aspect of the present invention is provided with a container in which insulating gas is enclosed, a contact-separable contactor provided in the container, an operation shaft for driving the contactor through the container, and the operation shaft penetrating portion of the container. In the gas insulated switchgear having a seal portion through which the operating shaft penetrates, The seal portion has a seal block having an inner circumferential surface facing the outer circumferential surface of the operating shaft, and a seal support sheet for holding the seal block and fixing it to the container, The first seal having a width in the operating shaft penetrating direction of the seal block inner circumferential direction is greater than or equal to a stroke of the operating shaft reciprocating motion, and a gap portion is provided along the circumferential direction on the inner circumferential surface of the seal portion, and the airtightness is increased on both sides of the gap portion. And a second seal for preventing the ingress of dust on both sides thereof, wherein the seal sheet It is in providing the guide part which slides with the said operation shaft outer peripheral surface at the edge part located in a container inner side.

According to such a gas insulated switchgear, since the length of the sealing shaft penetrating direction is greater than or equal to the stroke of the operating shaft reciprocating motion, a portion of the operating shaft that directly contacts both the insulated gas and the air inside and outside the container when the operating shaft reciprocates. The contact between the insulating gas and the air due to the reciprocating motion of the operating shaft can be eliminated with a simple structure, and a highly reliable gas insulated switchgear can be obtained.

In addition, the length of the seal shaft's operating shaft penetrating direction is set to a distance close to the stroke of the operating shaft reciprocating motion, and a gap portion is provided on the inner circumferential surface of the seal portion along the circumferential direction, thereby suppressing wear powder generation, reducing operating force, and sealing portion. It is possible to facilitate the processing of the sliding surface, and to prevent the inflow and inflow of the insulating gas and air in and out of the container when the operation shaft is reciprocated, and a reliable gas insulated switchgear can be obtained with a simple structure. .

In addition, since the bearing member is disposed on the inner circumferential surface of the seal portion to support the operation shaft, the bearing member can support the lateral load applied to the operation shaft, and can bear the frictional force acting between the seal portion and the operation shaft. By preventing the generation of scratches and abrasion powder of the operating shaft sliding portion, the seal performance and the insulation performance can be improved. As a result, a more reliable gas insulated switchgear can be obtained. Moreover, since the length of the penetrating direction of the seal shaft's operation shaft is set to a distance closer to the stroke of the reciprocating motion of the seal shaft, and the bearing member is disposed on the inner circumferential surface of the seal portion, the length of the seal shaft's penetrating direction does not need to be particularly long. As a result, it is possible to suppress the enlargement while improving the seal performance of the seal portion.

In addition, since the seal portion protrudes outward from the container and is detachably attached to the container, the inside volume of the container can be suppressed and the amount of filling of the insulating gas can be reduced, compared with the protruding inside, so that the attachment work is easy.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, in the drawings of each embodiment, corresponding parts are denoted by the same reference numerals and redundant descriptions are omitted.

1 is a longitudinal cross-sectional structural view of a first embodiment of a gas insulated switchgear according to the present invention;

2 is an enlarged cross-sectional structural view of the sealer seal portion thereof;

3 is an enlarged cross-sectional structural view of a seal portion of a second embodiment of a gas insulated switchgear according to the present invention;

Fig. 4 is a sectional structural view of a drive force transmission mechanism portion from the manipulator of the switch to the insulating rod.

Fig. 5 is a characteristic diagram showing the magnitude of the load applied to the operation shaft and the seal portion of the switch.

Fig. 6 is a characteristic diagram showing the relationship between the amplification factor of the stroke by the stroke conversion lever and the effective mass of the entire link system in the first and second embodiments of the gas insulated switchgear according to the present invention.

Fig. 7 is a cross-sectional structural view of the seal portion of the third embodiment of the gas insulated switchgear according to the present invention;

<Explanation of symbols for main parts of the drawings>

1: tank

2: insulation gas

3: buffer cylinder

4: piston

5: cylinder space

6: gas outflow hole

7: nozzle

8: operation contactor

9: fixed contact

10: insulated rod

11: stroke conversion lever

12: rotating support shaft

13: control shaft

14: manipulator

15: seal part

16: instrument case

17: Dashport

18: dash port lever

19: annular clearance

20: dust seal

21: Confidential Seal

22, 23: wear ring

24: flow lever

25: seal backing sheet

26: guide

27: bearing

28: backing sheet

29: seal block

31, 32: pin

First, a first embodiment of a gas insulated switchgear of the present invention will be described with reference to FIGS. 1 and 2.

1 is a longitudinal sectional structural view showing the entire structure of a gas insulated switchgear according to the present invention. In Fig. 1, the tank 1 constituting the container is formed of a cylindrical member whose main body 1a is elongated in the horizontal direction, and the left end surface of the cylindrical member is completely blocked by the lid member 1b. The right side cross-sectional opening of is closed by the cover member 1c which has a hole in the center. An insulating gas 2 such as SF6 is enclosed in the tank 1. The movable contact 8 is provided in the shaft center part in the buffer cylinder 3, and one side of the piston 4 is slidably inserted between the inner periphery of the cylinder 3 and the outer periphery of the movable contact 8. A space 5 formed by the buffer cylinder 3, the piston 4, and the movable contact 8 is formed. The through hole 6 through which the gas in this space 5 enters and out is formed in the buffer cylinder 3. The nozzle 7 protrudes to the left from the outer periphery of the through hole 6, and is formed. The movable contact 8 protrudes to the left from the inner circumference of the through hole 6 and is covered with the nozzle 7. The nozzle 7 and the movable contact 8 are coupled to the buffer cylinder 3.

The fixed contact 9 is coincident with the central opening of the nozzle 7, and is closed by being coupled with the movable contact 8, and is separated by opening to interrupt the current. The insulating rod 10 is coupled to the buffer cylinder 3 and is made of an insulating material. 1 and 2, one end of the stroke conversion lever 11 is rotatably supported by the rotation support shaft 12, and the other end thereof is rotatably connected to the insulating rod 10 by a pin 32. . One end of the operation shaft 13 is connected to the manipulator 14, and the other end thereof is rotatably connected to one end of the flow lever 24 via a pin 33. The driving force of the manipulator 14 is transmitted to the insulating rod 10 and the buffer cylinder 3 via the operation shaft 13, the flow lever 24, and the stroke conversion lever 11.

The mechanism case 16 is provided so as to close the center opening of the lid member 1c of the tank 1, and constitutes a part of the tank 1, and houses a link mechanism such as a stroke conversion lever 11 therein. The seal part 15 is provided in the part through which the operation shaft 13 penetrates the tank 1, specifically, the mechanism case 16, and prevents gas leakage from a through hole.

The dash port 17 is attached as necessary for cushioning and deceleration. The dash port lever 18 is rotated about the rotation support shaft 12 integrally with the stroke change lever 11. The dash port 17 operates by receiving the operation force of the manipulator 14 transmitted through the operation shaft 13 and the stroke change lever 11.

Next, the overall operation of the gas insulated switchgear will be described.

At the time of opening or closing of the contacts 8 and 9, the manipulator 14 is driven so that the operating shaft 13 is usually along the longitudinal direction, and passes through the stroke conversion lever 11 and the insulating rod 10 to the buffer cylinder. (3) moves at high speed, usually along the longitudinal direction of the insulated rod (10). Thus, the contacts 8, 9 are separated or combined. When the contacts 8 and 9 are opened, the insulating gas in the space 5 is compressed and blown out by the arc generated between the contacts 8 and 9 from the through hole 6 through the nozzle 7 to block extinguishment and current interruption. do.

At this time, the longitudinal direction of the insulating rod 10 substantially coincides with the axial direction in which the movable contact 8 is separated from the fixed contact 9, and this axis or direction is also referred to as an operating axis or an operating axis direction. have.

During this opening or closing operation, foreign matter is generated from the contact portion of the electrode, the sliding portion, or the arc generating portion, and enters the seal portion 15, resulting in a decrease in the seal performance and an increase in the frictional force. It may lead to an increase. In addition, during this opening or closing operation, the operation shaft 13 moves in and out of the tank 1. At this time, if the stroke on which the operating shaft 13 operates is longer than the length of the seal portion 15, a portion of the operating shaft 13 that contacts air outside the tank 1 enters the tank 1, and as a result, insulation There is a possibility that the gas 2 comes into contact with air. In addition, a lateral load (bending force) is applied to the operating shaft 13 in accordance with the rotational motion (swing) of the stroke shift lever 11 to generate a friction force on the seal portion 15, thereby increasing the amount of wear of the sliding portion and increasing the required operating force. There is a possibility that problems such as increase or damage to the seal parts may occur.

Next, the seal portion structure of the first embodiment of the gas insulated switchgear according to the present invention will be described in detail with reference to FIG.

2 is an enlarged cross-sectional structural view of the sealer seal portion thereof. In Fig. 2, the operation block 13 penetrates the inner circumferential surface of the seal block 29, and the seal block 29 is fitted to the seal support sheet 25 in an airtight manner. The seal support sheet 25 is fitted into a through hole portion through which the operation shaft 13 formed in the instrument case 16 penetrates, and is fixed to the instrument case 16 in an airtight manner. The seal part block 29 and the seal support sheet 25 may be fastened with a screw, or may use a shrink fit to be fastened using heat shrink of the member. Moreover, the seal receiving sheet 25 is detachably fastened with a screw so that the position of the center axis | shaft of the operation shaft 13 with respect to the mechanism case 16 can be positioned in the position mentioned later.

The seal support sheet 25 is in the form of a hollow container in which one side is largely opened so that the seal block 29 is inserted, and a through hole through which the operating shaft 13 penetrates is formed in the center of the other end. This through hole is formed slightly larger than the diameter of the operation shaft 13, and constitutes the guide portion 26 of the operation shaft 13. The seal support sheet 25 is attached so that the side which is largely opened has the outer side of the instrument case 16, and the side in which the through hole which comprises the guide part 26 was formed toward the inner side of the instrument case 16. As shown in FIG.

A gap portion 19 having a large gap (interval) between the outer circumferential surface of the operating shaft 13 on the inner circumferential surface of the seal portion block 29 constituting the seal portion 15, that is, the surface facing the outer circumferential surface of the operating shaft 13. ) Is formed. The gap portion 19 is formed to have a gap (gap) larger than both ends at a substantially central portion of the direction (length direction) through which the operation shaft 13 penetrates, and in the circumferential direction of the inner peripheral surface of the seal portion block 29. It is formed over the whole perimeter. Moreover, it is most preferable that the length Sa of the direction through which the operation shaft 13 of this clearance part 19 penetrates becomes more than the length equivalent to the stroke S1 of the operation shaft 13.

On the inner circumferential surface of the seal block 29, a seal member (dust seal) 20 for preventing dust from entering inward from both ends in the direction in which the operating shaft 13 of the seal block 29 passes, and insulating property The sealing member (sealed seal) 21 and the clearance gap 19 which consist of rubber | gum etc. for preventing the leakage of gas are arrange | positioned in this order. At this time, the dust seal 20 and the airtight seal 21 are each fitted in the groove formed along the circumferential direction on the inner circumferential surface of the seal portion block 29. It is more preferable that the distance Sb between the two hermetic seals 21 is formed to be equal to or greater than the length corresponding to the stroke S1 of the operation shaft 13. In addition, the distance Sc between the two dust seals 20 needs to be formed to be equal to or more than the length corresponding to the stroke S1 of the operation shaft 13.

Further, a wear ring 22 is formed between the inner circumferential surface of the gap portion 19 of the seal portion block 29 and the outer circumferential surface of the operating shaft 13 at approximately the center of the direction in which the operating shaft 13 of the gap portion 19 penetrates. It is installed. The wear ring 22 is a bearing made of resin, and the resin ring is formed by using only a resin and the like.

According to such a seal portion 15, even when the operating shaft 13 reciprocates to enter and exit the seal portion 14 by the stroke S1, both gases inside and outside the seal portion 15, that is, inside and outside the tank 1, are provided. No part is in direct contact with the. Although the part of the operation shaft 13 which contacted the outside air from the outer dust seal 20 once in the space of the clearance gap 19 enters, the distance Sc between the dust seals 20 will be the operation shaft 13. Since the stroke is greater than or equal to the stroke S1, the portion is not further in contact with the insulating gas 2 in the tank 1 beyond the inner dust seal 20. In addition, the inner insulation is prevented from the inner dust seal 20. The part of the operation shaft 13 which contacted the gas 2 does not contact the outside air from the outer dust seal 20 either. Therefore, the mixing of air into the tank 1 can be reduced, and the insulation deterioration of the insulating gas 2 in the tank 1 can be suppressed. Moreover, since the distance Sb between the airtight seals 21 is more than the stroke S1 of the operation shaft 13, the part of the operation shaft 13 which contacted the air outside the outer airtight seal 21 is an inner side airtight. There is no contact with the insulating gas 2 inside the seal 21. Thereby, it is possible to further suppress the insulation deterioration of the insulating gas 2 in the tank 1.

Moreover, when the penetrating direction length of the seal block 29 operation shaft 13 of the seal part 15 is made longer than the stroke of the operation shaft 13 reciprocating motion, the part which contacted the outside air of the operation shaft 13 will become Direct contact with the insulating gas inside the tank 1 is eliminated. However, if the stroke of the reciprocating motion of the operating shaft 13 becomes long, wear due to contact between the operating shaft 13 and the seal block 29 may increase. . Therefore, by providing the annular gap 19, the sliding area with the operation shaft 13 of the seal block 29 can be reduced, and the increase in wear and the generation of wear powder can be suppressed. Moreover, the resistance by friction can be reduced, and operation force can be reduced. Moreover, since the annular clearance 19 is provided, the range which strictly manages the space | interval of the operation shaft 13 in the surface which faces the operation shaft 13 of the seal block 29 becomes small, and becomes easy to process, It also improves efficiency.

Moreover, the wear ring 22 has the effect of supporting the lateral load (bending force) applied to the operation shaft 13 by the rotational movement (swing) of the stroke conversion lever 11, and has a bearing effect and slides. The member with small resistance is used. By using a bearing member such as a wear ring 22, it is possible to bear the frictional force acting between the operating shaft 13 and the seal block 29, and sliding the operating shaft 13 and the seal block 29 Sealing performance can be secured by preventing the occurrence of negative scratches and wear powder. In addition, it is possible to prevent the occurrence of the metal wear powder, thereby preventing the insulation from being impaired.

In addition, when a bearing member such as the wear ring 22 is disposed in the gap portion 19, the operating direction (penetration direction) dimension of the seal block 29 operating shaft 13 does not need to be as long as the wear ring. According to this embodiment, the enlargement of the seal part block 29 can be suppressed positively, improving the seal part performance.

If it is not necessary to consider the lateral load applied to the operating shaft 13 by the rotational movement (swing) of the stroke conversion lever 11, the wear ring 22 does not necessarily need to be installed.

Moreover, when the guide part 26 which has the clearance gap which can slide to the outer peripheral surface of the operation shaft 13 is provided in the seal support sheet 25, when opening and closing in the sliding part, such as the contact 8 in the tank 1, Invasion of the wear powder generated in the seal portion 15 can be prevented and the lateral load (bending force) to the operating shaft 13 and the seal portion 15 due to the swing of the stroke conversion lever 11 can be reduced. You can.

In this embodiment, since the length which the inner peripheral surface of the seal block 29 and the outer peripheral surface of the operation shaft 13 oppose becomes long, when the wear powder mixes between these opposing surfaces, the inner peripheral surface of the seal block 29 and the operation shaft ( There is a possibility of causing greater wear and increased friction between the outer circumferential surfaces of 13). Therefore, provision of the guide part 26 is especially effective for the improvement of reliability in this embodiment.

When the lateral load to the operation shaft 13 and the seal part 15 is small or need not be considered, it is not necessary to provide the guide part 26 of the seal support sheet 25, and in this case, the seal support sheet ( 25 may be formed into a cylindrical shape having circular openings of the same diameter on both end faces. In this case, the seal support sheet 25 may be omitted so that the seal block 29 is directly fixed to the mechanism case 16.

Next, a second embodiment of the gas insulated switchgear according to the present invention will be described with reference to FIGS.

3 is an enlarged cross-sectional structural view of the sealer seal portion thereof. In the present embodiment, in order to further increase the rigidity against the bending moment due to the above-described horizontal load (bending force), the wear ring 23 used as the bearing member is divided into two parts, and the gap portion with respect to the operation direction of the operation shaft 13 is divided. (19) It is attached between the dust seal 20 and the airtight seal 21 of both sides. Thereby, the space | interval which receives a lateral load can be enlarged, and rigidity with respect to the said bending moment can be enlarged.

If the wear ring 22 width of FIG. 2 is B and the two wear ring 23 spacing A of FIG. 3 is A, the moment stiffness is equal to that if the wear ring 22 and the wear ring 23 are the same material and thickness. The structure of 3 becomes A / B times (A> B). Accordingly, the frictional force between the operating shaft 13 and the seal block 29 can be reduced, the wear resistance can be prevented and the seal performance is ensured, while the metal wear powder can be generated and the penetration into the tank 1 can be prevented. It can prevent the fall of insulation. The wear ring 23 is a bearing made of resin, and the resin ring is used in addition to being formed only by resin. Moreover, the wear ring 22 of FIG. 2 and the wear ring of FIG. 3 as needed, for example, when the lateral load applied to the operation shaft 13 by the rotational movement (swing) of the stroke conversion lever 11 is especially large. (23) Both structures may be assembled and used.

By the way, the lateral load (bending force) applied to the operation shaft 13 can be calculated as shown to FIG. 4, FIG.

Fig. 4 is a sectional structural view of the driving force transmission mechanism portion from the manipulator to the insulating rod in the second embodiment of the gas insulated switchgear according to the present invention. Fig. 5 shows the magnitude of the load applied to the operation shaft and the seal portion of the switch. It is a characteristic figure to show. The floating link 24 is provided between the stroke change lever 11 and the operation shaft 13. The flow link 24 is rotatable at one end of the operation shaft 13 via a pin (rotation shaft) 33 and through a pin (rotation shaft) 32 at the center of the stroke conversion lever 11. Is connected. In addition, the dash port 17 is abbreviate | omitted in FIG.

The positions of the pins 31 and 32 are determined from the stroke conversion rate. Since the pin 32 connected to the operation shaft 13 moves circularly in response to the swing of the stroke change lever 119, the pin 32 is moved in the direction in which the flow link 24 swings and crosses the operation shaft 13. Displace. The operation axis | shaft 13 is provided so that it may be located in the middle of the range which the center axis | shaft displaces.

As shown in Fig. 4, when the effective length (distance between the pins 31 and 32) of the flow link 24 is L, the relationship between the operating force Fo and the lateral load (bending force) N (N / Fo) becomes like the solid line of FIG. 5 with respect to the link length L. FIG. Accordingly, when the operating force Fo and the link length L are transmitted, the lateral load (bending force) N applied to the operating shaft 13 can be calculated. As is apparent from Fig. 5, since the link length L becomes shorter than 110 mm, N / Fo becomes large, so it is desirable to secure 110 mm or more. When the friction coefficient is µ, the frictional force Fr can be calculated by Fr = µN. Therefore, the relation (muN / Fo) between the operating force Fo and the frictional force µN is the dotted line in Fig. 5 with respect to the link length L. It becomes the same characteristic as 5 has described the second embodiment, but has the same relationship in the first embodiment.

The link amplification ratio, the stroke of the buffer cylinder 3 and the stroke of the operating shaft 13 of the manipulator 14 will be described with reference to FIG. 6 in relation to the first and second embodiments described above.

6 shows the stroke amplification factor of the manipulator 4 by the stroke change lever 11 on the horizontal axis, and concentrates the mass of the effective mass (buffer cylinder 3) of the entire link system, where the mass is distributed and the kinetic energy. Is corrected to be equal to). The smaller the effective mass, the smaller the operating energy. The link amplification factor at which the effective mass is the smallest is calculated, and the stroke of the operating shaft 13 of the manipulator 14 is calculated by the predetermined stroke of the buffer cylinder 3. As is apparent from Fig. 6, the link amplification ratio L2 / L1 is 2.0 to 2.5, which is the most efficient stroke. The length of the arc-shaped gap 19 of the seal portion may be the same as or equal to the most efficient stroke.

Thereby, a lateral load (bending force) is small, operation energy is reduced, and the gas insulated switchgear which improved the seal performance can be obtained.

Next, a third embodiment of the gas insulated switchgear according to the present invention will be described with reference to FIG.

Fig. 7 is a cross-sectional structural view of the sealer seal portion thereof. The third embodiment has a vertical shape in which a buffer cylinder and an insulating rod are arranged up and down, and a bearing 27 that is a separate member is provided in place of the guide portion 26 of the seal support sheet 25. The bearing 27 is attached to the common seal support sheet 28 with the seal block 29 inside the seal block 29 in the penetrating direction of the operation shaft 13. In a vertical gas insulated switchgear having a buffer cylinder and an insulating rod disposed up and down, a stroke conversion lever is provided between the insulating rod and the operation shaft 13 to prevent sliding of the stroke conversion lever, the pin, the flow link, and the rotation support shaft. Even when abrasion powder is generated, it can be prevented from adhering on the insulating rod 10 to impair the insulating property. In this case, the bearing 27 can reliably prevent the generated wear powder from entering the seal block 29.

In addition, this invention can be implemented in other various forms, without deviating from the mind or main characteristic. Therefore, the preferable Example described in this specification is an illustration and is not restrictive. The scope of the present invention is represented by the appended claims, and all modifications falling within the meaning of the claims are included in the scope of the present invention.

According to the present invention, when the operating shaft reciprocates, the portion of the operating shaft that directly contacts both the insulated gas and air inside and outside the container can be eliminated, and the contact between the insulated gas and air due to the reciprocating motion of the operating shaft is prevented with a simple structure. It is possible to obtain a highly reliable gas insulated switchgear.

Claims (9)

A container insulated with insulating gas, a movable contactor provided in contact with the fixed contactor and a fixed contactor installed in the container, an operation shaft for driving the movable contactor through the container; In the gas insulated switchgear provided in the operation shaft penetrating part of the said container, and provided with the seal part which a said operation shaft penetrates, The length of the said operation shaft penetrating direction of the said seal part was made more than the stroke of the said operation shaft reciprocating motion. Gas insulated switchgear. The container of claim 1, wherein the container has a tank and an instrument case, the movable contact is coupled to a nozzle and a buffer cylinder, the operating shaft passes through the instrument case, one side is connected to the manipulator, and the other is a link. It is connected to the movable contact via a mechanism, and the seal portion is attached to the penetrating portion of the instrument case as a member separate from the instrument case, and arranged at least two seal members at intervals in the direction of the operation shaft penetration of the seal portion. And said space | interval made more than the stroke of the said operation shaft reciprocating motion, The gas insulated switchgear characterized by the above-mentioned. A container insulated with insulating gas, a contact-separable contactor provided in the container, an operation shaft for driving the contactor through the container, and a seal portion provided with the operation shaft penetrating portion of the container, through which the operation shaft penetrates. In the gas insulated switchgear provided, A gas insulated switchgear characterized in that a length in the operating shaft penetrating direction of the seal portion is equal to or more than a distance close to the stroke of the operating shaft reciprocating motion, and a gap portion is provided along the circumferential direction on the inner circumferential surface of the seal portion. 4. The gas insulation according to claim 3, wherein at least two seal members are disposed at intervals in the sealing shaft penetrating direction, and the gap portion is formed over the circumferential pole around the two seal members. switch. A container in which insulating gas is enclosed, a contact-separable contactor provided in the container, an operation shaft for driving the contactor through the container, and a seal through which the operation shaft is provided while being provided in the operation shaft penetrating portion of the container. In the gas insulated switchgear provided with a part, A gas insulated switchgear comprising a bearing member disposed on an inner circumferential surface of the seal portion to support a length of the seal shaft penetrating direction at least a distance close to the stroke of the manipulation shaft reciprocating motion. The said sealing part is arrange | positioned at least 2 seal members at intervals in the said operating shaft penetrating direction, The said clearance part is formed over the perimeter of the circumferential direction between the said 2 seal members, The said bearing The member is an insulating switch, characterized in that installed in the gap portion by using a wear ring having a small sliding resistance. A container filled with insulating gas, a fixed contactor provided in the container, a movable contact provided to be in contact with the fixed contactor, an operation shaft for driving the movable contact through the container, and a penetration of the operation shaft of the container. In the gas insulated switchgear which is provided as a separate member in the part and provided with the seal part which the said operation shaft penetrates, A gas insulated switchgear which protrudes outwardly from the container beyond the stroke of the operation shaft reciprocating motion to form a sliding surface with the operation shaft, and is attached to the container in an airtight manner. . A container filled with insulating gas, a fixed contactor provided in the container, a movable contactor provided in contact with the fixed contactor, an operation shaft for driving the movable contacter through the container, an insulating rod, and a lever In the gas insulated switchgear provided with a link mechanism and the seal part which the said operation shaft penetrates provided in the said operation shaft penetration part of the said container, The length of the sealing shaft penetrating direction of the seal portion is equal to or more than a distance close to the stroke of the operating shaft reciprocating motion, and the link mechanism connects the insulating rod to the movable contact side and the lever to the operating shaft side and simultaneously moves the upper portion from the upper side. A gas insulated switchgear, which is arranged in the order of a contactor, an insulating rod, and a lever. A container in which insulating gas is enclosed, a contact-separable contactor provided in the container, an operation shaft for driving the contactor through the container, and a seal through which the operation shaft is provided while being provided in the operation shaft penetrating portion of the container. In the gas insulated switchgear provided with a part, The seal portion has a seal block having an inner circumferential surface opposite to the operating shaft outer circumferential surface, and a seal support sheet for holding the seal block and fixing it to the container, wherein the width of the operating shaft penetrating direction of the seal block inner circumferential surface is increased. The inner circumferential surface of the seal portion is larger than the stroke of the axial reciprocating movement, and a gap portion is provided along the circumferential direction, and a first seal for enhancing airtightness on both sides of the gap portion, and a second seal that prevents intrusion of dust on both sides thereof. And a guide portion which slides with the outer circumferential surface of the operating shaft at an end portion positioned inside the container of the seal support sheet.