JP4575768B2 - Gas switch - Google Patents

Description

  The present invention relates to a gas switch in which a contactor and an operation mechanism of a switch are accommodated in a gas container filled with an insulating gas.

As shown in Patent Document 1, the gas switch operates a stationary contact, a movable contact, and a movable contact in a gas container in which an insulating gas such as SF ₆ gas is sealed as a quenching medium. An operation mechanism is housed and used by being mounted on a pole or housed in a case of a ground-mounted substation facility.

  In a gas switch, it is necessary to maintain the pressure in the gas container at a specified value or higher in order to obtain the specified silencing performance and ensure the safety of the operator. When it falls below the value, it is necessary to prohibit the operation. Therefore, it is necessary to provide the gas switch with a pressure reducing lock mechanism that locks the operation handle so that it cannot be operated when the gas pressure in the gas container drops below a specified value.

As shown in Patent Document 1, the decompression lock mechanism includes an operating shaft that responds to a change in pressure in the gas container, and the operating shaft is led to the outside of the gas container, a lock position, A lock rod that is slidable between an unlocked position and engages with an operating handle of the switch when in the locked position, and prevents the operation of the operating handle; A spring that biases the gas rod in the gas container, and when the gas pressure in the gas container exceeds a specified value and the operating shaft of the bellows protrudes beyond the gas container by a predetermined length or more, a lock rod is activated by the operation shaft. When the gas pressure in the gas container becomes less than the specified value and the projecting length of the operating shaft is shortened, the lock rod is released and the lock rod is moved by the biasing force of the spring. To slide towards the locked position. It constituted by a locking mechanism to capacity.

  In this type of gas switch, in order to prevent the gas container from becoming large, among the components of the decompression lock mechanism, a lock rod, a support member that slidably supports the lock rod, and a lock rod The lock mechanism is arranged outside the gas container, and the operation of the operation handle is locked by engaging the lock rod directly with the operation handle at the lock position.

  As a gas switch, a large container is divided into a gas chamber and a mechanism chamber, a contact is accommodated in the gas chamber, an operation mechanism and a decompression lock mechanism are accommodated in the mechanism chamber, and the gas pressure is reduced. In some cases, the operation mechanism is locked by locking the operation mechanism when it is lowered, but in this configuration, the container becomes large and the entire gas switch becomes large. Inevitable to become.

In order to prevent the container from becoming large and to make the entire gas switch compact, the contact and the operating mechanism are accommodated in the gas container, the lock rod of the decompression lock mechanism, and the lock rod The structure which arrange | positions the support member which supports slidably, and the latching mechanism of a lock rod to the exterior of a gas container must be taken. As described above, in the gas switch of the type in which the main components of the decompression lock mechanism are arranged outside the gas container, as shown in Patent Document 1, the components of the decompression lock mechanism are placed in the air. It was placed in an exposed state.
JP 2003-45299 A

  As shown in Patent Document 1, in the gas switch of the type in which the main components of the decompression lock mechanism are arranged outside the gas container, the components are arranged in a state exposed in the air. If the outer surface of the lock rod is contaminated due to the influence of the surrounding environment, or the water that has entered between the lock rod and the support member that slidably supports the lock rod freezes in the cold, the lock rod There is a problem that the protective operation by the pressure reducing lock mechanism cannot be normally performed when the gas pressure is lowered because the gas cannot move or becomes difficult to move.

  In order to solve such a problem, it is considered that a cover that covers the components of the decompression lock mechanism disposed outside the gas container is attached outside the gas container to protect the components of the decompression lock mechanism from the surrounding environment. It is done. In this case, the cover that covers the pressure reducing lock mechanism is provided with a guide hole through which the lock bar is slidable, and the lock bar needs to be engaged with the operation handle through the guide hole when the gas pressure decreases.

  However, since the cover that covers the components of the decompression lock mechanism needs to be attached to the outer surface of the gas container via a seal member such as a packing or gasket, the lock rod is attached due to variations in the compression amount of the seal member when the cover is attached. Variations occur in the position of the guide hole to be penetrated, and there arises a problem that it is difficult to align the guide hole of the cover and the lock rod.

  In the unlikely event that the positional relationship between the guide hole of the cover and the lock rod cannot be accurately adjusted, the frictional resistance between the lock rod and the inner surface of the guide hole increases, and the lock rod May not be able to slide smoothly, and the decompression lock mechanism may not be able to operate smoothly. Even if the cover can be installed correctly, dust is clogged in the gap between the lock rod and the inner periphery of the guide hole in the cover, or rainwater can enter the gap between the lock rod and the inner periphery of the guide hole in the cover. The lock rod becomes difficult to move when water enters the gap and the water freezes in the gap. The problem of deteriorating arises.

  An object of the present invention is to provide a gas switch of a type in which the components of the decompression lock mechanism are arranged outside the gas container, so that the components of the decompression lock mechanism become difficult to move or cannot move due to the influence of the surrounding environment. This is to improve the reliability of the protective operation when the gas pressure is reduced.

  The present invention relates to a gas container that accommodates a contact and its operation mechanism, an operation shaft of an operation mechanism that is provided through one wall of the gas container, and a rotation operation that is attached to the operation shaft. The present invention relates to a gas switch provided with an operation handle to be operated and a pressure reducing lock mechanism for preventing operation of the operation handle when the pressure in the gas container decreases.

  In the present invention, the depressurizing lock mechanism includes an operating shaft that responds to a change in pressure in the gas container, and the operating shaft is led out of the one wall portion of the gas container, and the gas container. The pressure detection lock mechanism unit having an output unit that is attached to the outside of the gas sensor and rotates when the operating shaft of the pressure detection mechanism responds to a decrease in the pressure in the gas container, and the output unit of the pressure detection lock mechanism unit is mechanically An operation handle locking mechanism having an input unit coupled to the output unit and rotated together with the output unit, and a lock lever rotated to a lock position that prevents operation of the operation handle when the input unit rotates Composed.

  With the above configuration, when the gas pressure in the gas container decreases, the output portion of the pressure detection lock mechanism portion is rotated, and the operation handle lock is performed as the output portion of the pressure detection lock mechanism portion rotates. Since the input unit of the mechanism unit is rotated and the lock lever is rotated to the lock position, the lock lever prevents the operation handle from rotating and the operation handle is prohibited.

  In general, an axis that performs a rotational motion is unlikely to be hindered even if the surface is soiled or the attached water freezes, unlike an axis that performs a sliding motion. Therefore, as described above, the pressure detection lock mechanism portion is configured such that the output portion performs a rotational motion when the gas pressure is reduced, and the lock lever performs the rotational motion instead of the lock rod that performs the sliding motion during the locking operation. Is used as a member for locking the operation handle, and the rotation movement of the output portion of the pressure detection lock mechanism portion that occurs when the gas pressure is reduced is transmitted to the lock lever via the input portion of the operation handle lock mechanism. Even when the surface of the rotating shaft of each part is soiled by the surrounding environment or the water adhering to the surface is frozen, the lock lever can be rotated to reliably perform the locking operation when the gas pressure is reduced. Therefore, according to the present invention, it is possible to prevent the locking operation from being hindered due to contamination or freezing by the surrounding environment, and to improve the reliability of the protection operation when the gas pressure is lowered.

In the present invention, a bag-like cover containing the pressure detection lock mechanism portion is attached to the gas container via a seal member, and among the components of the operation handle lock mechanism portion, components other than the lock lever are included. Located in the cover. The lock lever is disposed outside the cover and is pivotally supported by the cover.

  As described above, when the pressure detection lock mechanism and the cover that covers most of the components of the operation and handle lock mechanism are attached to the gas container via the seal member, the components of the decompression lock mechanism are affected by the surrounding environment. Therefore, the reliability of the operation of the decompression lock mechanism can be improved.

In the present invention, a male coupling portion and a female coupling portion that can mesh with each other are provided on one and the other of the output portion of the pressure detection locking mechanism portion and the input portion of the operation handle locking mechanism portion, respectively. The output portion and the input portion are mechanically connected to each other when the connecting portion and the female connecting portion are engaged with each other in a state in which relative displacement along the mounting direction of the cover is allowed between them.

  As described above, the male part in which the relative displacement in the attachment direction of the cover (the compression direction of the seal member) is allowed between the output part of the pressure detection lock mechanism part and the input part of the operation handle lock mechanism part. When the mechanical coupling is performed by meshing the shape coupling portion and the female coupling portion, the output portion of the pressure detection lock mechanism regardless of the compression amount of the seal member interposed between the cover and the gas container. And the input part of the operation handle lock mechanism part can be correctly coupled to assemble the decompression lock mechanism. Therefore, it is possible to provide a cover that covers the components of the decompression lock mechanism without making the assembly of the decompression lock mechanism difficult. it can.

  Usually, the pressure detection mechanism is configured such that the operating shaft of the pressure detection mechanism protrudes outward from one wall portion of the gas container by a set length or more when the pressure in the gas container is a specified value or more. .

  In this case, in a preferred aspect of the present invention, the pressure detection lock mechanism portion rotates between the locking position and the release position about a rotation center axis extending in a direction orthogonal to one wall portion of the gas container. The first coupling member provided so as to be able to lock the first coupling member in the locking position by the action of the operating shaft of the pressure detection mechanism when the pressure in the gas container is equal to or higher than a specified value; A locking mechanism that releases the locking of the first coupling member when the pressure in the gas container becomes less than a specified value and allows the first coupling member to rotate toward the open position; This pressure detection lock mechanism is supported outside the one wall of the gas container. The cover is attached to the outer surface of the one wall portion of the gas container via a seal member so as to cover the pressure detection lock mechanism portion.

  The operation handle lock mechanism is configured to have an output shaft rotatably supported by the cover in a state in which the axis coincides with the rotation center axis, and is disposed in the cover and fixed to the output shaft. A second coupling member mechanically coupled to the member, and an unlocked position and a lock when fixed to the output shaft outside the cover and when the first coupling member is in the locked position and in the open position, respectively. And an urging means for urging the first coupling member from the locking position to the open position side is at least one of the pressure detection lock mechanism part and the operation handle lock mechanism part. Is provided.

  Furthermore, a male coupling portion and a female coupling portion that can mesh with each other are provided on one and the other of the first coupling member and the second coupling member, respectively, so that the male coupling portion and the female coupling portion are located between each other. The first coupling member and the second coupling member are mechanically coupled to each other by meshing with each other in a state where relative displacement along the rotation center axis is allowed.

  Further, the operation handle is allowed to rotate when the lock lever is in the unlocked position, and when the lock lever is in the locked position, the operation of the operation handle is prevented by the engagement between the lock lever and the operation handle. In addition, the positional relationship between the lock lever and the operation handle and the shapes of the lock lever and the operation handle are set.

  When configured as described above, the first coupling member constitutes an output portion of the pressure detection lock mechanism portion, and the second coupling member constitutes an input portion of the operation handle lock mechanism portion.

  In another preferred aspect of the present invention, the pressure detection locking mechanism rotates between a locking position and an opening position about a rotation center axis extending in a direction orthogonal to the one wall portion of the gas container. The first coupling member provided so as to be movable, and engaged with and locked to the operating shaft of the pressure detection mechanism in a state of protruding from the one wall portion of the gas container to the outside by the set length or more. Between the action position held in the state and the retracted position away from the action position, and is provided so as to be linearly displaceable and engages with the first coupling member at the locking position when in the action position. A locking member for preventing the first coupling member from rotating to the open position side, and a first biasing means for biasing the locking member to displace the locking member from the operating position to the retracted position side; The pressure in the gas container drops below a specified value and the protruding length of the operating shaft When the locking member is unlocked by being less than a predetermined length, the locking member is displaced to the retracted position side by the biasing force of the first biasing means, and the first coupling member It is comprised so that rotation to the open position side is permitted.

  The cover is formed in a bag shape having a bottom wall portion and a side wall portion, and is attached to the outer surface of the one wall portion of the gas container via a seal member in a state where the pressure detection lock mechanism portion is accommodated inside. It is done.

  The operation handle lock mechanism is configured to have an output shaft rotatably supported on the bottom wall portion of the cover in a state where the axis coincides with the rotation center axis of the first coupling member, and the output shaft disposed in the cover. A second coupling member fixed to the first coupling member and mechanically coupled to the first coupling member, and fixed to the output shaft outside the cover, and when the first coupling member is in the locking position and opened A second biasing means configured to bias the first coupling member from the locking position to the open position side, each of which is configured by a lock lever disposed at the unlocked position and the locked position when in the position, It is provided in at least one of the pressure detection lock mechanism and the operation handle lock mechanism.

  Further, a male coupling portion and a female coupling portion that can mesh with each other are provided on one and the other of the first coupling member and the second coupling member, respectively, and the male coupling portion and the female coupling portion are mutually connected. The first coupling member and the second coupling member are mechanically coupled to each other by meshing with each other while allowing relative displacement along the rotation center axis therebetween.

  When the locking member is released by the operating shaft of the pressure detection mechanism, the locking member is locked against the urging force applied to the locking member from the second urging means through the first coupling member. In order to be able to displace the member to the retracted position side, a biasing force applied from the first biasing means to the locking member is applied from the second biasing means to the locking member through the first coupling member. The urging forces of the first urging means and the second urging means are set to be greater than the urging force to be applied.

  Further, the operation handle is allowed to rotate when the lock lever is in the unlocked position, and when the lock lever is in the locked position, the operation of the operation handle is prevented by the engagement between the lock lever and the operation handle. In addition, the positional relationship between the lock lever and the operation handle and the shapes of the lock lever and the operation handle are set.

  As the pressure detection mechanism, a mechanism provided with a bellows disposed in the gas container and an operating shaft having one end fixed to the bellows and the other end led out of the gas container can be used.

  As described above, according to the present invention, the pressure detection lock mechanism portion is configured so that the output portion performs a rotational motion when the gas pressure is reduced, and the lock lever that performs the rotational motion as a member that locks the operation handle is provided. Since the rotation movement of the output part of the pressure detection lock mechanism part that occurs when the gas pressure decreases is transmitted to the lock lever via the input part of the operation handle lock mechanism part, it is a component depending on the surrounding environment Even when the surface is soiled or the water adhering to the surface is frozen, the lock lever can be rotated to reliably perform the locking operation when the gas pressure is lowered. Therefore, according to the present invention, it is possible to prevent the locking operation from being hindered due to contamination or freezing by the surrounding environment, and to improve the reliability of the protection operation when the gas pressure is lowered.

  In the present invention, when the cover that covers the pressure detection lock mechanism and the components of the operation handle lock mechanism other than the lock lever is attached to the gas container via the seal member, the components of the decompression lock mechanism are Therefore, it is possible to prevent the pressure reducing lock mechanism from being damaged by being damaged due to the influence of water and by preventing rainwater or the like from adhering to the component parts and freezing.

  Further, in the present invention, a male coupling portion and a female coupling portion that can mesh with each other are provided on one and the other of the output portion of the pressure detection lock mechanism portion and the input portion of the operation handle lock mechanism portion, respectively. The output unit and the input unit are mechanically coupled by engaging the coupling unit and the female coupling unit with each other while allowing relative displacement between the coupling unit and the female coupling unit in the cover mounting direction. In this case, regardless of the amount of compression of the seal member interposed between the cover and the gas container, the output part of the pressure detection lock mechanism part and the input part of the operation handle lock mechanism part are correctly coupled, Since the decompression lock mechanism can be assembled, a cover that covers the components of the decompression lock mechanism can be provided without making the assembly of the decompression lock mechanism difficult.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
1 to 12 show the configuration of an embodiment of the present invention. FIG. 1 (A) is a front view of a gas switch with a part omitted, and FIG. 1 (B) is the gas switch. FIG. 2 is a cross-sectional view showing the structure of the pressure reducing lock mechanism taken along the line II-II in FIG. 1A, and FIG. 3 is a front view of the cover. 4 is a rear view of the cover of the decompression lock mechanism shown in FIG. 3, FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 1, and FIG. 6 is a decompression view after removing the cover from FIG. 7 is a cross-sectional view showing the configuration of the pressure detection lock mechanism of the lock mechanism, and FIG. 7 is a cross-sectional view of the main part of the pressure detection lock mechanism of the decompression lock mechanism taken along line VII-VII in FIG. 8 is a cross-sectional view showing the configuration of the operation handle lock mechanism of the decompression lock mechanism shown in FIG. 5, and FIG. FIG. 10 is a front view showing a state of the operation handle lock mechanism portion of the decompression lock mechanism shown in FIG. 5 at the time of the locking operation. 11 is a cross-sectional view similar to FIG. 5 showing the state of the pressure reducing lock mechanism during the locking operation, and FIG. 12 is a front view showing the state of the pressure detecting lock mechanism portion of the pressure reducing lock mechanism during the locking operation.

The gas switch 1 shown in FIGS. 1 to 12 is housed together with other components such as a transformer in a case of a ground-mounted substation equipment. In FIGS. This is a box-shaped gas container in which SF ₆ gas as a medium is sealed at a predetermined pressure. A step portion 2ao is formed in a portion near the lower portion of one wall portion 2a of the gas container 2, and a portion below the step portion 2ao of the wall portion 2a is located behind the upper wall 2a1 of the wall portion 2a. The bushing attachment portion 2a2 that is retracted to the right is formed, and a required number of bushings BS are attached through the bushing attachment portion 2a2.

  In the gas container 2, a three-phase stationary contact constituting the switch, a three-phase movable contact (not shown) contacting and separating from the stationary contact, and an operation for operating the movable contact A mechanism (not shown) is accommodated, and each contactor and a through conductor of a predetermined bushing BS are connected via a connection conductor (not shown).

  The operation mechanism includes an operation shaft 3 that is rotated, and the operation shaft 3 is led out to the outside through another wall portion 2 b of the gas container 2. An operation handle 4 is attached to an end portion of the operation shaft 3 located outside the gas container 2. The operation handle 4 is formed by bending a metal plate. As shown in FIG. 1B, a base 4A having one end fixed to the operation shaft 3 and an operation shaft 3 from the other end of the base 4A. And an upright portion 4B that is erected on the opposite side, and a grip portion 4C that is connected to the end of the erected portion 4B opposite to the base portion 4A and that extends along a direction parallel to the base portion 4A. In addition, a hole 401 for engaging a hook attached to the tip of an insulating operation rod used when operating the gas switch is formed at the tip of the grip portion 4C. In this embodiment, when the operation handle 4 is in the cut position indicated by the solid line in FIG. 1A, the switch is open, and the operation handle 4 is rotated to the entry position indicated by the chain line in FIG. When this is done, the switch will be closed.

  Positioned in the vicinity of the operation shaft 3, a pressure reducing lock mechanism 5 that prevents the operation of the operation handle 4 when the gas pressure in the gas container 2 decreases is attached to the wall 2 b of the gas container 2. As shown in FIG. 5, the decompression lock mechanism 5 used in this embodiment includes an operating shaft 6 a that responds to a change in the pressure in the gas container 2, and the operating shaft of the gas container 2 When the pressure detection mechanism 6 led out to the outside of the wall portion 2b and the operating shaft 6a of the pressure detection mechanism 6 attached to the outside of the wall portion 2b of the gas container 2 respond to the pressure drop in the gas container 2 A pressure detection lock mechanism portion 7 having a rotating output portion 7a, a cover 8 attached to the wall portion 2b of the gas container, and an output portion 7a of the pressure detection lock mechanism portion 7 are mechanically coupled to the output portion. The operation handle lock mechanism 9 includes an input portion 9a that is rotated together with 7a and a lock lever 901 that is rotated to a lock position that prevents the operation of the operation handle 4 when the input portion 9a is rotated. Has been.

  More specifically, the pressure detection mechanism 6 includes a bellows 601 disposed in the gas container 2, and an operating shaft 6a is disposed at the axial center of the bellows, and the rear end portion of the operating shaft is The bellows 601 is connected to one end (free end). The other end of the bellows 601 is closed by a mounting bracket 602, and the other end of the operating shaft 6a is led out to the outside through a hole provided in a shaft center portion of a boss portion 602a provided in the mounting bracket. The boss portion 602a of the mounting bracket 602 is led out of the gas container through the hole 201 provided through the wall portion 2b of the gas container in an airtight manner. A nut 603 is screwed into a female screw portion formed on the outer periphery of a portion led out of the gas container of the boss 602a, and the bellows 601 is fixed to the gas container 2 by tightening the nut.

  The illustrated pressure detection mechanism 6 has a protrusion length of the distal end portion 6a1 of the operating shaft 6a to the outside of the gas container when the gas pressure in the gas container 2 is a predetermined value or more and the contraction amount of the bellows 6b is a set value or more. When the gas pressure in the gas container 2 becomes less than the set value and the contraction amount of the bellows decreases (when the bellows expands) when the gas pressure in the gas container 2 becomes less than the set length, the gas pump is moved out of the gas container at the tip 6a1 of the operating shaft 6a The projecting length is less than the set length.

  As shown in FIGS. 5 to 7, the pressure detection lock mechanism unit 7 includes a support member 702 fixed to a support plate 700 having one end welded to the wall 2 b of the gas container 2 by a bolt 701. Yes. The support member 702 is formed of a U-shaped member integrally having a bottom wall portion 702a and upright wall portions 702b and 702c that are erected on the same side from both ends in the width direction of the bottom wall portion. Is formed with a hole 702a1 through which a nut 603 for fixing the bellows to the gas container is passed. Bolts 701 and 701 are screwed into the standing wall portion 702b through a through hole provided in the support member 702, and the support member 702 is fastened to the support plate 700 by these bolts. The through hole provided in the support plate 700 for allowing the bolt 701 to pass therethrough is a long hole. With the bolt 701 loosened, the distance between the support member 702 and the wall 2b of the gas container is finely adjusted. Can be done.

  A shaft member 703 extending in a direction perpendicular to the wall surface of the wall portion 2b of the gas container 2 is fixed to the bottom wall portion 702a of the support member 702, and pressure is applied to the small diameter shaft portion 703a formed at the tip of the shaft member 703. A first coupling member 705 constituting the output portion 7a of the detection lock mechanism portion 7 is rotatably attached. The first coupling member 705 is a lever-like member, and a small-diameter shaft portion 703a at the tip of the shaft member 703 is fitted into a hole provided at the rear end portion. A snap pin 706 (see FIG. 7) is inserted into a hole provided at the tip of the small diameter shaft portion 703a, and the snap pin prevents the first coupling member 705 from coming off from the shaft member 703.

  The first coupling member 705 is shown in FIG. 12 as a locking position where the first coupling member 705 is locked by the locking member 710 as shown in FIG. 7, with the axis of the shaft member 703 as the rotation center axis. As described above, it is rotated between the open position where it comes into contact with the upright wall portion 702c of the support member. The rear end portion of the first coupling member 705 is formed in a strip shape so that the opposite side surfaces 705a and 705a extend in parallel with each other along the direction orthogonal to the axis of the rotation shaft. The rear end portion of the first coupling member 705 formed in the above is a male coupling portion of the pressure detection lock mechanism portion 7. A portion near the tip of the first coupling member 705 is formed in a tapered shape, and the tip of the coupling member 705 is rounded.

  A large-diameter guide hole 702b1 and a small-diameter guide hole 702c1 are respectively formed in the opposite side wall portions 702b and 702c upstanding from both ends in the width direction of the bottom wall portion 702a of the support member 702, and these guide holes can be slid freely. The slide rod 711 is supported by being penetrated. In the illustrated example, a portion near one end and a portion near the other end of the slide bar 711 are a large-diameter portion 711a and a small-diameter portion 711b, respectively, and a medium-diameter portion between the large-diameter portion 711a and the small-diameter portion 711b. 711c is formed, and the large diameter portion 711a and the small diameter portion 711b are slidably fitted in the guide holes 702b1 and 702c1, respectively.

  The locking member 710 is made of a disk-shaped member, and the middle diameter portion 711c of the slide bar 711 is fitted into a hole that penetrates the central portion of the locking member in the axial direction. The locking member 710 is positioned in contact with a step formed between the large-diameter portion 711a and the medium-diameter portion 711c of the slide bar. As shown in FIG. 7, a washer 712 fitted to the small diameter portion 711 b of the slide bar 711 is brought into contact with the locking member 710, and between the washer 712 and the standing wall portion 702 c of the support member 702. A compression coil spring 713 is provided. In this example, when the gas pressure in the gas container 2 is not less than a specified value and the protruding length of the tip of the operating shaft 6a of the pressure detection mechanism 6 is longer than the set length, the tip 6a1 of the operating shaft 6a is the locking member. When the gas pressure in the gas container becomes less than a specified value and the protruding length of the tip of the operating shaft 6a becomes less than the set length, the operating shaft is engaged. The diameter of the locking member 710 is set so that the distal end portion 6a1 of 6a is detached from the locking member 710 and the locking member 710 is unlocked.

  As shown in FIG. 7, the locking member 710 is engaged with the distal end portion of the first coupling member 705, and the operation position where the first coupling member 705 is locked in the locking position, As shown in FIG. 12, the first coupling member is unlocked so as to be freely linearly displaced between the retracted position where the first coupling member is released and brought into contact with the upright wall portion 702b of the support member 702. When the gas pressure in the gas container 2 is equal to or higher than a specified value, the pressure is locked by the operating shaft 6a of the pressure detection mechanism and is held at the operating position shown in FIG. When the locking by is released, the spring 713 is displaced to the retracted position shown in FIG.

  In this embodiment, the coil spring 713 constitutes a first urging means that urges the locking member 710 so as to displace it from the operating position to the retracted position. The first urging means, the locking member 710, and the guide rod 711 engage the first coupling member 705 by the action of the operating shaft 6a when the pressure in the gas container is equal to or higher than a specified value. The first coupling member 705 is unlocked when the pressure in the gas container becomes less than a specified value, and the first coupling member is allowed to rotate toward the open position. A locking mechanism is configured, and the pressure detection lock mechanism unit 7 is configured by the locking mechanism and the first coupling member 705.

  The cover 8 is formed in a bag shape having a rectangular bottom wall portion 801 and a side wall portion 802 rising from the peripheral edge portion of the bottom wall portion, and the pressure detection lock mechanism portion 7 is accommodated inside. It is attached to the outer surface of the wall 2b of the gas container 2 via a seal member. In the illustrated example, a flange portion 803 projecting outward is formed at the opening end of the side wall portion 802, and a mounting hole 804 is formed in the flange portion 803. A frame body 10 that is fitted to the inner surface of the side wall portion 802 of the cover 8 and positions the cover 8 is fixed to the outer surface of the wall portion 2 b of the gas container 2, and a gasket that is a sealing member so as to surround the frame body 10. 11 is arranged. The cover 8 has the collar portion 803 abutted against the wall portion 2b of the gas container via the gasket 11, the stud bolt 12 fixed to the wall portion 2b of the gas container 2 is fitted into the mounting hole 804, and the frame 8 It arrange | positions in the state which made the body 10 fit inside the side wall part 802, and is fastened by the gas container 2 with the nut 13 screwed together by each stud bolt 12. FIG. The gasket 11 is disposed in a compressed state between the collar portion 803 and the wall portion 2b of the gas container to seal the attachment portion of the cover 8 in a liquid-tight manner.

  A boss member 902 that shares an axis with the shaft member 703 fixed to the support member 702 is attached to the bottom wall portion 801 of the cover 8. The boss member 902 is disposed in a state of passing through a mounting hole formed in the bottom wall portion 801 of the cover, and an outer peripheral portion thereof is welded to the bottom wall portion 801 of the cover. An output shaft 903 having one end fixed to the rear end portion of the lock lever 901 is rotatably fitted to the boss member 902, and the operation handle lock mechanism 9 is connected to the other end of the output shaft 903 introduced into the cover 8. A second coupling member 904 constituting the input unit 9a is attached.

  The second coupling member 904 is formed of a U-shaped member having a base portion 904a and a pair of upstanding wall portions 904b and 904b that stand up from both ends of the base portion 904a. A square hole 904a1 (see FIG. 4) is formed in a state of passing through the central portion of the base 904a of the second coupling member 904, and a rectangular section formed at the other end of the output shaft 903 is fitted into the square hole 904a1. Thus, the rotation prevention between the output shaft 903 and the second coupling member 904 is achieved. A snap pin 905 is attached to the other end of the output shaft 903 that passes through the square hole of the base portion 904a and protrudes into the cover 8, and the snap pin 905 prevents the second coupling member 904 from coming off from the output shaft 903. It has been.

  In the present embodiment, the second coupling member 904 constitutes a female coupling portion that meshes with the rear end portion (male coupling portion) of the first coupling member 705, and FIGS. As shown in the drawing, the rear end of the first coupling member 705 of the pressure detection lock mechanism unit 7 between the standing wall portions 904b and 904b of the second coupling member 904 with the cover 8 attached to the gas container. By fitting the portions, the rear end portion (male coupling portion) of the first coupling member 705 and the second coupling member 904 (female coupling portion) are engaged with each other, and the second coupling member 904 is engaged. And the first coupling member 705 (the output portion 7a of the pressure detection locking mechanism portion 7 and the input portion 9a of the operation handle locking mechanism portion 9) are in the center axis of rotation of the first coupling member 705. In a state in which relative displacement along the mounting direction of the cover 8 is allowed. It is coupled manner. The lock lever 901 is formed of a member in which a stopper portion 901a rising at a right angle to the plate surface of the metal plate is formed at the tip of the band plate-like metal plate. It arrange | positions in the state facing the wall part 801. FIG.

  A winding spring 906 is disposed so as to surround the boss member 902 within the cover 8. One end of the winding spring 906 is fixed to the second coupling member 904, and the other end 906 a is in contact with the inner surface of the side wall 802 of the cover 8. The urging force of the coil spring 906 is transmitted from the second coupling member 904 to the first coupling member 705 through the first coupling member 705. Further, in a state where the tip of the first coupling member 705 is in contact with the outer periphery of the locking member 710 and locked, the urging force of the winding spring 906 is transmitted from the first coupling member 705 to the locking member 710. . In this example, the winding spring 906 constitutes a second urging means for urging the first coupling member 705 from the locking position to the open position side.

  In the present embodiment, the operation handle lock mechanism 9 is configured by the lock lever 901, the output shaft 903 fixed to the lock lever and rotatably supported by the cover 8, and the second coupling member 904. . The lock lever 901 is disposed at the unlocked position indicated by the solid line in FIGS. 2 and 3 when the locking member 710 is locking the first coupling member 705 as shown in FIG. As shown in FIG. 12, when the locking member 710 is displaced to the retracted position and the locking of the first coupling member 705 is released, the urging force of the spring 906 indicates the thin line in FIG. It is rotated to the locked position shown by the solid line in FIG.

  FIG. 9 shows the position of the lock lever 901 when the cover 8 is removed and no external force is applied to the lock lever 901. When the cover 8 is attached to the gas container, the lock lever 901 at the position shown in FIG. 9 is rotated clockwise to the position shown in FIG. Are coupled to the first coupling member 705.

  In the illustrated example, when the locking member 710 is unlocked by the operating shaft 6a of the pressure detection mechanism, the locking member 710 is given from the spring 906 (second biasing means) to the locking member 710 through the first coupling member 705. In order to be able to displace the locking member 710 toward the retracted position against the biasing force applied, the biasing force applied to the locking member 710 from the spring 713 (first biasing means) is applied. The urging forces of the compression coil spring 713 and the winding spring 906 are set so as to be larger than the urging force applied to the locking member 710 from the spring 906 (second urging means) through the first coupling member 705.

  Further, when the lock lever 901 is in the unlocked position indicated by the solid line in FIG. 1, the turning operation of the operation handle 4 is allowed, and when the lock lever 901 is in the locked position indicated by the thin line in FIG. The positional relationship between the lock lever 901 and the operation handle 4 and the shapes of the lock lever 901 and the operation handle 4 are such that the rotation of the operation handle is hindered by the engagement between the stopper portion at the tip of the operation handle and the operation handle. Is set.

  In the illustrated example, when the lock lever 901 is in the unlocked position, the upright portion 4B of the operation handle 4 can rotate between the cutting position and the entering position without touching the stopper portion 901a of the lock lever 901. In addition, when the lock lever 901 is in the locked position, the operation handle 4 is rotated from the cutting position toward the entering position, and is rotated from the entering position toward the cutting position. Is in contact with the stopper portion 901a of the lock lever 901, and the rotation of the operation handle 4 is prevented (operation of the operation handle is prohibited).

  In the above embodiment, when the gas pressure in the gas container 2 is equal to or higher than the specified value, the tip 6a1 of the operating shaft 6a of the pressure detection mechanism 6 is connected to the locking member 710 as shown in FIGS. The locking member 710 is locked at the operating position by contacting the side surface. In this state, the distal end of the first coupling member 705 contacts the outer periphery of the locking member 710 so that the first coupling member 705 is locked at the locking position, and the lock lever 901 is in the unlocked position shown in FIG. is there. At this time, the operation handle 4 can be rotated from the entry position to the cut position and from the cut position to the entry position without being obstructed by the lock lever 901. Therefore, the switch can be operated without any trouble.

  On the other hand, when the gas pressure in the gas container 2 drops below a specified value, the operating shaft 6a of the pressure detection mechanism 6 is disengaged from the locking member 710, so that the locking member 710 is moved by the biasing force of the spring 713 as shown in FIG. And it displaces to the retracted position shown in FIG. 12, and the latching of the 1st coupling member 705 is released. Accordingly, since the first coupling member 705 rotates to the open position shown in FIG. 11, the lock lever 901 rotates to the lock position as shown in FIG. In this state, the upright portion 4B of the operation handle 4 abuts against the stopper portion 901a of the lock lever 901 in the process of rotating the operation handle 4 from the entering position to the cutting position and in the process of rotating from the cutting position to the entering position. Since the rotation is hindered, the opening and closing operation of the switch is prohibited.

  As described above, the pressure detection lock mechanism unit 7 is configured so that the output unit rotates when the gas pressure in the gas container 2 decreases, and the lock lever that rotates as a member for locking the operation handle 4 When the rotation movement of the output part of the pressure detection lock mechanism part 7 generated when the gas pressure is reduced is transmitted to the lock lever 901 via the input part of the operation handle lock mechanism 9 using the 901, the surrounding environment Thus, even when the surface of the component is soiled or the water adhering to the surface is frozen, the lock lever can be rotated to reliably perform the locking operation when the gas pressure is lowered.

  As described above, when the cover 8 that covers the components of the operation handle lock mechanism 9 other than the pressure detection lock mechanism 7 and the lock lever 901 is attached to the gas container 2 via the seal member 11, the pressure reduction lock mechanism This prevents the components of the product from being damaged by the influence of the surrounding environment, and prevents rainwater and other moisture from adhering to the components and freezing. it can.

  In addition, as described above, a male coupling portion and a female coupling portion that can mesh with each other are provided on one and the other of the output portion of the pressure detection lock mechanism portion 7 and the input portion of the operation handle lock mechanism portion 9, respectively. The output section and the input section are mechanically coupled by engaging the male coupling section and female coupling section of each other with each other being allowed to move relative to each other along the cover mounting direction. As a result, the output portion of the pressure detection lock mechanism portion 7 and the input portion of the operation handle lock mechanism portion 9 are independent of the compression amount of the seal member 11 interposed between the cover 8 and the gas container 2. And the pressure reducing lock mechanism can be assembled. Therefore, it is possible to provide the cover 8 that covers the components of the decompression lock mechanism without making the assembly of the decompression lock mechanism difficult.

  In the above example, the pressure detection lock mechanism 7 is provided with a male coupling portion at the output portion 7a, and the input coupling portion 9a of the operation handle lock mechanism portion 9 is provided with a female coupling portion to engage the pressure detection lock. The output unit 7a of the mechanism unit 7 and the input unit 9a of the operation handle lock mechanism unit 9 are mechanically coupled. However, the output unit 7a of the pressure detection lock mechanism unit 7 is provided with a female coupling unit. By providing a male coupling portion on the input portion 9a of the lock mechanism portion 9 and engaging them, the output portion 7a of the pressure detection lock mechanism portion 7 and the input portion 9a of the operation handle lock mechanism portion 9 are mechanically coupled. You may do it.

  In the above embodiment, the locking mechanism that locks the first coupling member 705 is configured by the locking member 710 and the spring 713. However, as shown in FIG. 13, the tip of the operating shaft 6a of the pressure detection mechanism. The first engaging member 705 may be locked at the locking position by directly engaging the first engaging member 705 with the side surface of the first coupling member 705. In this case, a locking mechanism that locks the first coupling member 705 is configured by the operating shaft 6a of the pressure detection mechanism.

  In the embodiment described above, the winding spring 906 is provided on the operation handle lock mechanism 9 side as the biasing means for biasing the first coupling member from the locking position to the release position. You may provide in the detection lock mechanism part 7 side, and you may provide in both a pressure detection lock mechanism part and an operation handle lock mechanism part.

(A) is the front view which abbreviate | omitted and showed the gas switch concerning this invention, (B) is a side view of the operation handle used with the gas switch. It is sectional drawing which showed the structure of the pressure-reduction locking mechanism used in the gas switch of this embodiment, cross-sectioning along the II-II line of FIG. 1 (A). It is the front view which looked at the same decompression locking mechanism from the front side of the cover. FIG. 4 is a rear view of a cover of the decompression lock mechanism shown in FIG. 3. It is the VV sectional view taken on the line of FIG. It is sectional drawing which removed the cover from FIG. 5 and showed the structure of the pressure detection lock mechanism part of a pressure reduction lock mechanism. It is sectional drawing which showed the principal part of the pressure detection locking mechanism part of the pressure reduction locking mechanism in the section along the VII-VII line of FIG. It is sectional drawing which showed the structure of the operation handle lock mechanism part of the pressure-reduction lock mechanism shown by FIG. It is a front view in the state where it removed from the gas container of the cover used in the decompression lock mechanism of this embodiment. It is the front view which showed the state at the time of the locking operation of the operation handle lock mechanism part of the pressure-reduction lock mechanism shown by FIG. It is sectional drawing similar to FIG. 5 which showed the state at the time of the lock | rock operation | movement of the decompression locking mechanism used by embodiment of this invention. It is the front view which showed the state at the time of the locking operation of the pressure detection locking mechanism part of the decompression locking mechanism used by embodiment of this invention. It is sectional drawing similar to FIG. 8 which showed the modification of the pressure detection lock mechanism part of the pressure reduction lock mechanism concerning this invention.

DESCRIPTION OF SYMBOLS 1 Gas switch 4 Operation handle 5 Pressure reduction lock mechanism 6 Pressure detection mechanism 6a Actuation shaft 7 Pressure detection lock mechanism part 7a Output part 705 First coupling member 710 Locking member 713 Compression coil spring 8 Cover 9 Operation handle lock mechanism part 9a Input Part 901 Lock lever 904 Second coupling member

Claims (3)

A gas container containing the contact and its operation mechanism, an operation shaft of the operation mechanism provided through one wall portion of the gas container, and an operation attached to the operation shaft and rotated. In a gas switch comprising a handle and a decompression lock mechanism that prevents operation of the operation handle when the pressure in the gas container drops,
The decompression lock mechanism includes an operating shaft that responds to a change in pressure in the gas container, and the operating shaft is led out of the one wall portion of the gas container;
A pressure detection lock mechanism having an output part attached to the outside of the gas container and rotating when the operating shaft responds to a decrease in pressure in the gas container;
An input unit that is mechanically coupled to the output unit of the pressure detection lock mechanism unit and rotated together with the output unit, and is rotated to a lock position that prevents operation of the operation handle when the input unit rotates. An operation handle lock mechanism having a lock lever ;
A bag-like cover which is attached to the gas container via a seal member and accommodates the pressure detection lock mechanism and components other than the lock lever among the components of the operation handle lock mechanism. When,
Comprising
The lock lever is disposed outside the cover and is pivotally supported by the cover.
A male coupling portion and a female coupling portion that can mesh with each other are provided on one and the other of the output portion of the pressure detection lock mechanism portion and the input portion of the operation handle lock mechanism portion, respectively, The output part and the input part are mechanically connected with each other in a state where relative displacement along the attachment direction of the cover is allowed between the female connection part and the female connection part;
Gas switch characterized by . A gas container containing the contact and its operation mechanism, an operation shaft of the operation mechanism provided through one wall portion of the gas container, and an operation attached to the operation shaft and rotated. In a gas switch comprising a handle and a decompression lock mechanism that prevents operation of the operation handle when the pressure in the gas container drops,
The decompression lock mechanism includes:
An operating shaft that responds to a change in pressure in the gas container is provided, and when the pressure in the gas container is equal to or greater than a specified value, the operating shaft protrudes outward from a wall portion of the gas container by a set length or more. A pressure detection mechanism that becomes
A first coupling member provided so as to be able to rotate between a locking position and an opening position around a rotation center axis extending in a direction orthogonal to the one wall portion of the gas container; When the pressure in the gas container is equal to or higher than a specified value, the first coupling member is locked at a locking position by the action of the operating shaft, and when the pressure in the gas container becomes less than a specified value, A locking mechanism that unlocks the first coupling member and allows the first coupling member to rotate toward the open position, and is supported outside the one wall portion of the gas container. A pressure detection lock mechanism portion,
A cover attached to an outer surface of the one wall portion of the gas container via a seal member so as to cover the pressure detection lock mechanism portion;
An output shaft that is rotatably supported by the cover in a state in which the central axis coincides with the rotation center axis, and is fixed to the output shaft and disposed in the cover, and is attached to the first coupling member. A second coupling member coupled to each other, and an unlocked position and a lock when the first coupling member is fixed to the output shaft outside the cover and the first coupling member is in the locked position and in the open position, respectively. An operation handle lock mechanism having a lock lever disposed at a position;
Biasing means provided on at least one of the pressure detection lock mechanism and the operation handle lock mechanism to bias the first coupling member from the locking position to the release position; A male coupling portion and a female coupling portion are provided on one and the other of the first coupling member and the second coupling member, respectively, and the male coupling portion and the female coupling portion are provided. The first coupling member and the second coupling member are mechanically coupled to each other by meshing with each other in a state in which relative displacement along the rotation center axis is allowed between them,
When the lock lever is in the unlocked position, the operation handle is allowed to rotate, and when the lock lever is in the lock position, the lock lever and the operation handle are engaged to rotate the operation handle. The gas switch in which the positional relationship between the lock lever and the operation handle and the shapes of the lock lever and the operation handle are set so that the lock lever is prevented. A gas container containing the contact and its operation mechanism; an operation shaft of the operation mechanism provided through one wall of the gas container; and an opening / closing device attached to the operation shaft to open and close the opening / closing device A gas switch provided with an operation handle that is pivotally operated to reduce pressure and a pressure reducing lock mechanism that prevents operation of the operation handle when the pressure in the gas container decreases;
The decompression lock mechanism includes:
An operating shaft that responds to a change in pressure in the gas container is provided, and when the pressure in the gas container is equal to or greater than a specified value, the operating shaft protrudes outward from a wall portion of the gas container by a set length or more. A pressure detection mechanism that becomes
A first coupling member provided so as to be able to rotate between a locking position and an opening position around a rotation center axis extending in a direction orthogonal to the one wall portion of the gas container; An operating position that is held in a locked state by engaging with an operating shaft of the pressure detection mechanism that protrudes outward from one wall portion of the gas container by the set length or more, and away from the operating position. Between the retracted position and linearly displaceable, when in the operating position, the first connecting member engages with the first connecting member in the locking position and the first connecting member rotates to the open position side. And a first biasing means for biasing the locking member so as to displace the locking member from the operating position to the retracted position side, and the pressure in the gas container is a specified value. When the protrusion length of the operating shaft is less than the set length by lowering to less than When the locking member is released, the locking member is displaced to the retracted position side by the urging force of the first urging means, and the first coupling member is rotated to the open position side. A pressure detection lock mechanism configured to allow movement;
Formed in a bag shape having a bottom wall portion and a side wall portion, and attached to the outer surface of the one wall portion of the gas container via a seal member in a state in which the pressure detection lock mechanism portion is accommodated inside. A cover,
An output shaft rotatably supported on the bottom wall portion of the cover in a state in which the axis line coincides with the rotation center axis, and the first coupling disposed in the cover and fixed to the output shaft. A second coupling member that is mechanically coupled to the member, and is locked to the output shaft outside the cover and is unlocked when the first coupling member is in the locked position and in the open position, respectively. An operation handle lock mechanism having a lock lever disposed at a position and a lock position;
A second urging means provided on at least one of the pressure detection lock mechanism and the operation handle lock mechanism to urge the first coupling member from the locking position to the release position;
A male coupling portion and a female coupling portion are provided on one and the other of the first coupling member and the second coupling member, respectively, and the male coupling portion and the female coupling portion are provided. The first coupling member and the second coupling member are mechanically coupled to each other by meshing with each other in a state in which relative displacement along the rotation center axis is allowed between them,
When the locking member is unlocked by the operating shaft of the pressure detection mechanism, the biasing force applied to the locking member from the second biasing means through the first coupling member is resisted. In order to enable the locking member to be displaced to the retracted position side, a biasing force applied to the locking member from the first biasing means is applied to the first biasing means from the second biasing means. The urging forces of the first urging means and the second urging means are set so as to be greater than the urging force applied to the locking member through one coupling member;
When the lock lever is in the unlocked position, the operation handle is allowed to rotate, and when the lock lever is in the locked position, the operation lever is rotated by the engagement of the lock lever and the operation handle. A gas switch in which a positional relationship between the lock lever and the operation handle and shapes of the lock lever and the operation handle are set so that the operation is hindered.

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