JP2021061176A - Operation rod - Google Patents

Abstract

To provide an operation rod in which workability is improved.SOLUTION: The operation rod includes: a cylindrical housing part which can house the end part of a fuse tube; an engaging part provided on the inner peripheral surface of the housing part to engage with a projection part, which is provided on the outer peripheral surface of the fuse tube to extend to the circumferential direction of the housing part and project to the axial line side of the housing part; and a spring member whose one end is fixed in the housing part and the other end is fixed to a contact plate to contact to the end part of the fuse tube. In this operation rod, to fix the fuse tube to the operation rod, the fuse tube is inserted in the housing part while compressing the spring member by contacting the end part of the fuse tube to the contact plate, to engage the projection part with the engaging part, thus to fix the fuse tube to the operation rod. Also, to separate the fuse tube from the operation rod, the engagement of the projection part with the engaging part is removed and the fuse tube is pushed out from the housing part by the extension force of the spring member, thus to separate a fuse from the operation rod.SELECTED DRAWING: Figure 3

Description

This specification discloses a technique relating to an operation rod for attaching and detaching a fuse cylinder used in a high pressure cutout.

In order to protect the transformer and the like, a high-voltage cutout in which the fuse cylinder is housed in a porcelain insulator is used. When opening / closing the distribution line or replacing the fuse cylinder, the operator attaches / detaches the fuse cylinder using an operation rod in order to ensure the safety and ease of work. Patent Document 1 discloses an operation rod provided with a cylindrical accommodating portion capable of accommodating an end portion of a fuse cylinder. The operation rod of Patent Document 1 is provided with an engaging portion that engages with a protruding portion provided on the outer peripheral surface of the fuse cylinder on the inner peripheral surface of the accommodating portion. The engaging portion extends in the circumferential direction of the accommodating portion and protrudes toward the axis of the accommodating portion. In the operation rod of Patent Document 1, the fuse cylinder is inserted into the accommodating portion, and the fuse cylinder is fixed to the operation rod by engaging the protruding portion and the engaging portion. On the other hand, when separating the fuse cylinder from the operating rod, the protruding portion and the engaging portion are disengaged, and the fuse cylinder is pulled out from the accommodating portion.

Jitsukosho 48-27144 Gazette

In the operation rod of Patent Document 1, when the fuse cylinder is attached to the high-pressure cutout, the fuse cylinder is inserted into a predetermined position in the high-pressure cutout using the operation rod, and the protruding portion and the engaging portion are disengaged. , Move the operating rod downward (away from the high pressure cutout) and pull out the fuse tube from the housing. When moving the operating rod, if the protruding part and the engaging part are not completely disengaged, the engaging part will be caught on the protruding part or the side surface of the fuse cylinder, and the fuse cylinder will be displaced downward. It ends up. Therefore, when the fuse cylinder is pulled out from the accommodating portion after the fuse cylinder is attached to the high-voltage cutout, it is necessary to carefully operate the operation rod, resulting in poor workability. It is an object of the present specification to provide an operation rod with improved workability.

The operating rods disclosed herein are used to attach and detach the fuse tube used in high pressure cutouts. The operating rod includes an accommodating portion, an engaging portion, and a spring member. The accommodating portion has a cylindrical shape capable of accommodating the end of the fuse cylinder. The engaging portion is provided on the inner peripheral surface of the accommodating portion, extends in the circumferential direction of the accommodating portion, and projects toward the axis side of the accommodating portion. The engaging portion engages with a protruding portion provided on the outer peripheral surface of the fuse cylinder. One end of the spring member is in contact with the inside of the accommodating portion, and the other end is in contact with the contact plate in contact with the end of the fuse cylinder. In the above operating rod, when the fuse cylinder is fixed to the operating rod, the end of the fuse cylinder is brought into contact with the contact plate to compress the spring member, and the fuse cylinder is inserted into the accommodating portion to engage the protruding portion and the engaging portion. The fuse cylinder is fixed to the operating rod by engaging. Further, when the fuse cylinder is separated from the operating rod, the protruding portion and the engaging portion are disengaged. When the fuse cylinder is inserted into a predetermined position in the high-pressure cutout and the operating rod is separated, when the protrusion and the engaging portion are disengaged, the fuse cylinder is pushed up by the extension force of the spring member. By pushing down the operating rod while pushing up the fuse cylinder, the fuse cylinder and the operating rod can be easily separated without the fuse cylinder being displaced downward.

A cross-sectional view of a high pressure cutout is shown. The appearance of the operation rod of the first embodiment is shown. A cross-sectional view of the accommodating portion is shown (cross-section along lines III-III in FIGS. 2 and 4). The plan view (the view observed from the axis CL direction) of the accommodating part is shown. A cross-sectional view of the accommodating portion is shown (cross-sectional view along the VV line in FIG. 4). Indicates a state in which the fuse cylinder is inserted into the operating rod. The figure explaining the method of attaching and detaching the fuse cylinder and the operation rod is shown. The cross-sectional view of the accommodating part of the operation rod of 2nd Example is shown. The cross-sectional view of the accommodating part of the operation rod of 3rd Example is shown. The cross-sectional view of the accommodating part of the operation rod of 4th Example is shown.

(High voltage cutout)
The high voltage cutout is connected between the distribution line and a device such as a transformer via an external electric wire. The high-pressure cutout includes a cylindrical main body insulator made of porcelain and a fuse cylinder housed in the main body insulator. High pressure cutouts are sometimes referred to as cylindrical cutouts. The fuse tube can be removed from the high pressure cutout. When the fuse tube is inserted into the insulator of the main body, the distribution line and equipment such as a transformer are connected (the distribution line is closed). If the fuse cylinder is removed from the main body (opens the distribution line), or if an excessive current (current exceeding the specified value) flows through the high-pressure cutout (fuse cylinder) and the fuse element inside the fuse cylinder blows, the distribution line and the distribution line The distribution line between the devices is cut off. When the fuse element is blown, the distribution line and the device can be reconnected by replacing the fuse link in the fuse cylinder.

(Operation rod)
The operating rod is used to attach / detach the fuse tube to the high pressure cutout. The operating rod includes a cylindrical accommodating portion capable of accommodating the end of the fuse cylinder. The accommodating portion may be formed by processing the end portion of the operation rod main body, or may be formed by fixing another part (for example, a cylindrical tubular member) to the end portion of the operation rod main body. Alternatively, it may be formed by an end portion of the operating rod body and another part.

An engaging portion that engages with a protruding portion provided on the outer peripheral surface of the fuse cylinder is provided on the inner peripheral surface of the accommodating portion. The engaging portion extends in the circumferential direction of the accommodating portion and protrudes toward the axis of the accommodating portion. Therefore, the radial size of the accommodating portion is smaller in the portion where the engaging portion is provided. The engaging portion is provided to fix the fuse cylinder and the operating rod (accommodating portion) when the fuse cylinder is attached to and detached from the high-pressure cutout. That is, the protruding portion of the fuse cylinder is engaged with the engaging portion, and the fuse cylinder is attached / detached with the fuse cylinder and the operating rod fixed. When fixing the fuse cylinder and the operation rod, first, the end portion of the fuse cylinder is inserted into the accommodating portion so that the protruding portion of the fuse cylinder passes through the portion where the engaging portion of the accommodating portion is not provided. After that, the fuse cylinder and the operating rod can be fixed by rotating the operating rod so that the protruding portion and the engaging portion face each other in the axial direction of the accommodating portion. Further, when separating the fuse cylinder and the operating rod, the fuse cylinder and the operating rod can be separated by rotating the operating rod so that the protruding portion and the engaging portion do not face each other in the axial direction of the accommodating portion.

The engaging portion may extend in the circumferential direction of the accommodating portion and may partially extend along the axial direction of the accommodating portion. For example, the engaging portion may have an L-shape in which one end in the circumferential direction extends along the axial direction. In this case, when the operating rod is rotated, the protruding portion of the fuse cylinder comes into contact with the portion extending along the axial direction of the engaging portion, and the rotation of the operating rod is restricted. That is, the portion extending along the axial direction of the engaging portion functions as a stopper for the protruding portion. By limiting the rotation of the protruding portion with a stopper, the protruding portion and the engaging portion can be surely opposed to each other in the axial direction. If the engaging portion is L-shaped, rotating the operating rod in the forward direction (for example, to the right) fixes the fuse cylinder and operating rod, and rotating it in the opposite direction (for example, to the left) fixes the fuse cylinder and operating rod. Can be separated. It should be noted that only one engaging portion may be provided on the inner peripheral surface of the accommodating portion, or a plurality of engaging portions may be provided.

A spring member is arranged in the accommodating portion. One end of the spring member is in contact with the inside of the accommodating portion, and the other end is in contact with the contact plate. The spring member is in contact with the inside of the accommodating portion and the contact plate in a compressed state. The spring member may be fixed in the accommodating portion and on the contact plate. The contact plate comes into contact with the end of the fuse cylinder when the fuse cylinder is accommodated in the accommodating portion. When the fuse cylinder is accommodated in the accommodating portion, the spring member is further compressed. In other words, when the fuse cylinder is accommodated in the accommodating portion (the fuse cylinder is fixed to the operating rod), the extension force of the spring member is applied to the fuse cylinder. As described above, when the fuse cylinder and the operating rod are fixed, the protruding portion of the fuse cylinder is engaged with the engaging portion. That is, the fuse cylinder is prevented from moving to the outside of the accommodating portion. When the fuse cylinder and the operating rod are fixed, the extension force of the spring member is applied to the fuse cylinder, so that the fuse cylinder can be prevented from being displaced in the axial direction (the fuse cylinder rattles) in the accommodating portion. The spring member may be any component that is elastically deformed, and may be, for example, a coil spring, a leaf spring, or rubber. The spring member is preferably a coil spring from the viewpoint of ensuring a large moving distance of the contact plate in the accommodating portion.

The shape of the contact plate is not particularly limited as long as it can come into contact with the end of the fuse cylinder and deform the shape of the spring member as the fuse cylinder moves in the accommodating portion. For example, the contact plate may have a flat plate shape, a tubular shape having a bottom portion in contact with the end portion of the fuse cylinder (bottomed cylinder shape), or a bottom portion in contact with the end portion of the fuse cylinder. It may have a shape having a plurality of side wall portions extending from the outer periphery of the tablet along the axial direction, or it may have a cage shape. If the contact plate has a flat plate shape, the space for arranging the contact plate in the accommodating portion can be reduced. The axial length of the accommodating portion can be made relatively short, and a compact operating rod can be realized. Further, if the contact plate has a bottomed cylinder shape, a shape in which a plurality of side wall portions extend from the bottom portion, or a cage shape, the contact plate may surround the outer circumference of the fuse cylinder when the fuse cylinder is inserted into the accommodating portion. it can. The fuse cylinder is prevented from coming into contact with the inner wall of the accommodating portion, and the movement of the fuse cylinder in the accommodating portion is stabilized.

Further, the contact plate having a flat plate shape, a bottomed cylinder shape, and a shape in which a plurality of side wall portions extend from the bottom portion may have a through hole (first through hole). By providing a first through hole in the contact plate and a second through hole in the side wall of the operation rod that communicates with the first through hole, an overcurrent is generated when the fuse cylinder is attached to and detached from the high voltage cutout, and the fuse is blown. Even when an arc-extinguishing gas is generated by fusing, the arc-extinguishing gas can be released to the outside through the first and second through holes.

As described above, when fixing the fuse cylinder to the operating rod, the end of the fuse cylinder is brought into contact with the contact plate to compress the spring member while inserting the fuse cylinder into the accommodating portion, and the protruding portion and the engaging portion are engaged with each other. Engage. When separating the fuse cylinder from the operating rod, the protruding portion and the engaging portion are disengaged. When the protruding portion and the engaging portion are disengaged, the extension force of the spring member is applied to the fuse cylinder, so that the fuse cylinder can be pushed out from the accommodating portion by the extension force of the spring member. After attaching the fuse cylinder to the high-pressure cutout, when pulling out the operating rod from the high-pressure cutout, the engagement between the protruding part and the engaging part can be reliably disengaged, so that the engaging part is caught in the fuse cylinder. It is possible to prevent the position of the fuse cylinder from shifting downward. Specifically, when the protruding portion and the engaging portion are disengaged by the extension force of the spring member, the operating rod can be pushed down while pushing up the fuse cylinder. After inserting the fuse tube into the high pressure cutout, it is not necessary to carefully pull the operating rod out of the high pressure cutout to prevent the fuse tube from shifting downwards. As a result, the work of attaching the fuse cylinder to the high-voltage cutout can be facilitated.

(High voltage cutout)
The high voltage cutout 100 will be described with reference to FIG. The high voltage cutout 100 is provided on the distribution line and is used to protect equipment such as a transformer. The high-voltage cutout 100 connects the main body insulator 8 made of porcelain, the first electrode 56 connected to the distribution line side, the second electrode 46 connected to the device side, and the first electrode 56 and the second electrode 46. The fuse cylinder 12 is provided. The main body insulator 8 has a cylindrical shape, and a plurality of insulating folds 14 are provided on the outer peripheral surface. In the main body insulator 8, a columnar first chamber 4 and a columnar second chamber 20 having a diameter larger than that of the first chamber 4 are formed. A cylindrical arc extinguishing cylinder 6 is arranged in the first chamber 4. The fuse cylinder 12 is arranged inside the arc extinguishing cylinder 6. The high-pressure cutout 100 is installed so that the first chamber 4 is on the upper side and the second chamber 20 is on the lower side in the direction of gravity. The first electrode 56 is arranged in the first chamber 4, and the second electrode 46 is arranged in the second chamber 20. Hereinafter, in the direction in which the fuse cylinder 12 extends (that is, the direction of gravity), the first electrode 56 side is referred to as "upper side", "upper side", etc., and the second electrode 46 side is referred to as "lower side", "lower side", etc. Sometimes.

A conical upper mold cone 2 is fixed to the upper part of the main body insulator 8 by an adhesive. The leader wire of the upper mold cone 2 is connected to the distribution line. A conical lower mold cone 28 is fixed to the lower side wall 24 of the main body insulator 8 with an adhesive. The leader wire of the lower mold cone 28 is connected to a device such as a transformer.

The fuse cylinder 12 extends from the first chamber 4 to the second chamber 20 and connects the first electrode 56 and the second electrode 46. The fuse cylinder 12 includes an insulating cylinder 50 accommodating the fuse 10, an upper contactor 52 provided on the upper portion of the insulating cylinder 50, and an arc extinguishing rod 54 provided on the upper portion of the upper contactor 52. A lower contactor 48 provided at the lower part of the insulating cylinder 50 and a display cylinder 58 provided below the lower contactor 48 are provided. The upper contactor 52 is connected to the first electrode 56, and the lower contactor 48 is connected to the second electrode 46. A cushioning member 18 is arranged between the lower contactor 48 and the upper surface of the second chamber. Below the lower contactor 48, a flange portion 26 and a protruding portion 42 are provided on the side surface of the fuse cylinder 12. The flange portion 26 goes around the fuse cylinder 12 substantially, and two protrusions 42 are provided at an angular interval of 180 degrees in the circumferential direction. The display cylinder 58 is fixed to the insulating cylinder 50. On the other hand, the lower contactor 48 can be displaced in the vertical direction with respect to the insulating cylinder 50 and the display cylinder 58. The display cylinder 58 constitutes the lower end of the fuse cylinder 12.

The fuse 10 includes a fuse element 16 arranged in the insulating cylinder 50 and a fuse lead wire 40 connected to the fuse element 16. The fuse lead wire 40 is folded upward from the lower end of the display cylinder 58 outside the display cylinder 58, and is fastened and fixed to a tightening screw 60 attached to the lower contactor 48. A spring 44 is arranged between the lower contactor 48 and the display cylinder 58 in a compressed state. Therefore, a tensile force is applied to the fuse lead wire 40. In other words, the spring 44 is compressed by tightening and fixing the fuse lead wire 40 to the tightening screw 60.

An opening 30 is provided on the lower side of the main body insulator 8 (the lower end of the second chamber 20), and a cylindrical lower cover 36 is fixed to the opening 30 by an adhesive. The lower cover 36 is provided with an opening 34, and the opening 34 is closed by the lid member 32.

In the high-voltage cutout 100, the fuse element 16 is blown when a current exceeding a specified value flows through the distribution path in which the high-voltage cutout 100 is arranged. As a result, the spring 44 expands, and the fuse cylinder 12 (parts other than the lower contact 48) moves downward while the lower contact 48 is connected to the second electrode 46. When the fuse cylinder 12 moves downward, the display cylinder 58 collides with the lid member 32, the lid member 32 comes off from the lower cover 36, and the display cylinder 58 is exposed to the lower part of the high-pressure cutout 100. That is, by confirming whether or not the display cylinder 58 is exposed below the high-voltage cutout 100, it is possible to determine whether or not the fuse element 16 is blown (whether or not the fuse cylinder 12 needs to be replaced). Even if the fuse element 16 is blown, the lower contactor 48 continues to be connected (fixed) to the second electrode 46. Therefore, the fuse cylinder 12 (display cylinder 58) moves downward by the amount that the spring 44 is extended, and is prevented from falling from the high-pressure cutout 100.

When the fuse element 16 is blown (the display cylinder 58 is exposed from the main body insulator 8), the fuse cylinder 12 is pulled out from the main body insulator 8 in order to replace the fuse cylinder 12. When the distribution line on which the high-voltage cutout 100 is arranged is opened (load is released) due to construction work or the like, the lid member 32 is removed from the lower cover 36, and the fuse cylinder 12 is pulled out from the main body insulator 8. In this case, when the fuse cylinder 12 is pulled out, an arc is generated between the upper contactor 52 and the first electrode 56. However, the arc heat melts a part of the arc extinguishing rod 54 and the arc extinguishing cylinder 6 to generate an arc extinguishing gas, and the arc is extinguished by the arc extinguishing gas. When the fuse cylinder 12 is inserted into the main body insulator 8, the lid member 32 is removed from the lower cover 36, the fuse cylinder 12 is inserted into the main body insulator 8, and then the lid member 32 closes the opening 34 of the lower cover 36. The operator uses the operating rod 70 when inserting the fuse cylinder 12 into the main body insulator 8 and pulling out the fuse cylinder 12 from the main body insulator 8 (attaching / detaching the fuse cylinder 12 to the high voltage cutout 100). Hereinafter, the operation rod 70 will be described.

(Operating rod: 1st Example)
The operation rod 70 will be described with reference to FIGS. 2 to 7. As shown in FIG. 2, the operation rod 70 has a rod shape, and the operation rod main body 76, the accommodating portion 72 provided at the tip of the operation rod main body 76, and the opposite of the accommodating portion 72 with respect to the operation rod main body 76. It is provided with a grip portion 78 provided on the side. The accommodating portion 72 has a cylindrical shape on the inside, and can accommodate the end portion (display cylinder 58 side) of the fuse cylinder 12. A through hole 80 is provided in the side wall of the operation rod 70 (the side wall of the accommodating portion 72). The through hole 80 is an example of the second through hole. The through hole 80 communicates with the space in the accommodating portion 72. Further, a circular collar 74 is provided on the outer periphery of the operation rod main body 76 between the accommodating portion 72 and the grip portion 78 (between the through hole 80 and the grip portion 78). The outer diameter of the collar 74 is larger than the outer diameter of the accommodating portion 72. In the following description, the central axis of the accommodating portion 72 (the direction in which the operating rod 70 extends) may be referred to as the axis CL.

As shown in FIG. 3, the accommodating portion 72 is fixed to the bottomed cylindrical first cylindrical portion 86 and the tip of the first cylindrical portion 86 (the end on the opening side of the accommodating portion 72 in the axial CL direction). A cylindrical second cylindrical portion 84 and a tubular cover portion 82 surrounding the outer periphery of the first cylindrical portion 86 and the second cylindrical portion 84 are provided. The tip of the first cylindrical portion 86 and the base end of the second cylindrical portion 84 (the end opposite to the opening side of the accommodating portion 72 in the axis CL direction) are fixed by screws. Further, the first cylindrical portion 86 and the cover portion 82 are also fixed by screws. As a result, the first cylindrical portion 86, the second cylindrical portion 84, and the cover portion 82 are fixed to each other. The outer diameter of the first cylindrical portion 86 and the outer diameter of the second cylindrical portion 84 are equal, and the inner diameter of the first cylindrical portion 86 is smaller than the inner diameter of the second cylindrical portion 84.

A recess 86b is provided in the bottom portion 86a of the first cylindrical portion 86. The through hole 80 is provided on the side wall of the first cylindrical portion 86 so as to face the bottom portion 86a and the recess 86b. The through hole 80 communicates the space inside the first cylindrical portion 86 with the space outside the accommodating portion 72. Therefore, even if the tip of the accommodating portion 72 (the tip of the second cylindrical portion 84) is closed, the space inside the accommodating portion 72 is not sealed. An engaging portion 85 is provided at the tip of the second cylindrical portion 84 (the end on the opening side of the accommodating portion 72 in the axis CL direction). The engaging portion 85 projects toward the axis CL, and the radial size of the second cylindrical portion 84 is smaller than the other portions in the portion where the engaging portion 85 is provided. The details of the engaging portion 85 will be described later.

A coil spring 88 and a bottomed tubular contact plate 90 are arranged in the accommodating portion 72. More specifically, the coil spring 88 and the contact plate 90 are arranged in the second cylindrical portion 84, one end of the coil spring 88 is fixed to the end surface on the tip end side of the first cylindrical portion 86, and the other end. Is fixed to the contact plate 90. A through hole 90b is provided in the bottom 90a of the contact plate 90. The through hole 90b is an example of the first through hole. The through hole 90b communicates with the through hole 80 through the space in the accommodating portion 72. Therefore, the contact plate 90 does not block the tip portion of the accommodating portion 72.

The tip of the contact plate 90 is bent outward in the radial direction. The tip of the coil spring 88 passes outside the side wall of the contact plate 90 and is fixed to the tip (bent portion) of the contact plate 90. The outer diameter of the tip of the contact plate 90 is larger than the radial size of the second cylindrical portion 84 of the portion where the engaging portion 85 is provided, and the outer diameter of the second cylindrical portion 84 of the portion where the engaging portion 85 is not provided. Smaller than the radial size (inner diameter). Therefore, the coil spring 88 and the contact plate 90 are held in the accommodating portion 72 (inside the second cylindrical portion 84). That is, the coil spring 88 and the contact plate 90 do not move out of the accommodating portion 72. The coil spring 88 is fixed to the contact plate 90 and the tip end surface of the first cylindrical portion 86 in a compressed state. Therefore, the contact plate 90 is located on the tip end side (the side where the engaging portion 85 is provided) of the second cylindrical portion 84. In the operation rod 70, the coil spring 88 and the contact plate 90 are arranged in the second cylindrical portion 84 so that the tip of the contact plate 90 is located closer to the opening side of the accommodating portion 72 than the bottom portion 90a.

The engaging portion 85 will be described with reference to FIG. The engaging portion 85 is formed by partially projecting toward the axis CL at the end portion of the second cylindrical portion 84. In the operation rod 70, two engaging portions 85 are provided at intervals in the circumferential direction of the second cylindrical portion 84. More specifically, the two engaging portions 85 are provided at positions symmetrical with respect to the axis CL. As shown in FIG. 5, one end of the engaging portion 85 extends along the axis CL. Therefore, when the engaging portion 85 is observed from the radial center of the second cylindrical portion 84, it has an L shape. In other words, a stopper 85a extending along the axis CL is formed at one end of the engaging portion 85. The tip of the contact plate 90 comes into contact with the engaging portion 85 (stopper 85a) and is restricted from moving in the axis CL direction (it is prevented from moving to the outside of the accommodating portion 72).

A method of attaching / detaching the fuse cylinder 12 and the operating rod 70 will be described with reference to FIGS. 6 and 7. When attaching the fuse cylinder 12 to the operation rod 70, first, the display cylinder 58 side of the fuse cylinder 12 is inserted into the accommodating portion 72. When inserting the fuse cylinder 12 into the accommodating portion 72, the operator rotates the operation rod 70 in the arrow 93 direction (right direction) while pushing the end portion of the fuse cylinder 12 into the accommodating portion 72. As shown in FIG. 7, the protruding portion 42 of the fuse cylinder 12 moves in the direction of arrow 96, passes through a portion of the second cylindrical portion 84 where the engaging portion 85 is not provided (a portion having a large inner diameter), and the stopper 85a. Contact. When the protruding portion 42 came into contact with the stopper 85a, the operating rod 70 could not be rotated, and the operator said that the protruding portion 42 was engaged with the engaging portion 85 (the fuse cylinder 12 was fixed to the operating rod 70). ) Can be recognized. The operator fixes the fuse cylinder 12 and the operating rod 70 when inserting the fuse cylinder 12 into the high-pressure cutout 100 and when removing the fuse cylinder 12 from the high-pressure cutout 100 (the fuse cylinder 12 is fixed to the operating rod 70). Attach to).

As shown in FIG. 6, when the fuse cylinder 12 is inserted into the accommodating portion 72, the contact plate 90 moves to the proximal end side (first cylindrical portion 86 side) of the second cylindrical portion 84, and the coil spring 88 is further compressed. To. As a result, the contact plate 90 applies a force (a force that the coil spring 88 tries to extend) to the fuse cylinder 12 to move it to the outside of the accommodating portion 72. However, since the protruding portion 42 is engaged with the engaging portion 85, the fuse cylinder 12 does not move to the outside of the accommodating portion 72. The fuse cylinder 12 is prevented from moving in the axis CL direction (rattling in the axis CL direction) by the contact plate 90 and the engaging portion 85. Since the contact plate 90 has a bottomed cylinder shape, when the fuse cylinder 12 is inserted into the accommodating portion 72, the fuse cylinder 12 is surrounded by the contact plate 90.

When the fuse cylinder 12 is pulled out from the high-voltage cutout 100, the fuse cylinder 12 is pulled out with the protruding portion 42 and the engaging portion 85 engaged. As described above, the bottom 90a of the contact plate 90 is provided with a through hole 90b, and the through hole 80 is provided on the side wall of the accommodating portion 72. Therefore, even if an overcurrent is generated when the fuse cylinder 12 is pulled out from the high-voltage cutout 100 and an arc-extinguishing gas is generated due to the fuse being blown, the arc-extinguishing gas is operated through the through holes 90b and 80. Can be released to the outside of. It is possible to prevent pressure (pressure of arc-extinguishing gas) from being applied to the operating rod 70, and to prevent the safety of the work of extracting the fuse cylinder 12 from being impaired.

After inserting the fuse cylinder 12 into the high-voltage cutout 100 and after removing the fuse cylinder 12 from the high-voltage cutout 100, the fuse cylinder 12 and the operating rod 70 are separated. When separating the fuse cylinder 12 and the operating rod 70, the operating rod 70 is rotated in the direction of arrow 91 (leftward) (see FIG. 7). The protruding portion 42 and the engaging portion 85 are disengaged, and the fuse cylinder 12 and the operating rod 70 can be separated from each other. As described above, when the fuse cylinder 12 is inserted into the accommodating portion 72, the coil spring 88 is compressed, and a force for moving the fuse cylinder 12 to the outside of the accommodating portion 72 is applied to the fuse cylinder 12. Therefore, when the protruding portion 42 and the engaging portion 85 are disengaged, the fuse cylinder 12 is pushed out of the accommodating portion 72 by the extension force of the coil spring 88. After the fuse cylinder 12 is inserted (attached) into the high-voltage cutout 100, when the protrusion 42 and the engaging portion 85 are disengaged, the position of the fuse cylinder 12 does not actually change, and the accommodating portion 72 (Operating rod 70) is pushed back downward to a position where it does not come into contact with the fuse cylinder 12.

In the conventional operating rod, after inserting the fuse cylinder into the high-pressure cutout, the protruding portion provided on the fuse cylinder and the engaging portion provided on the accommodating portion are disengaged, and the operating rod is pulled out. In this case, even when the protruding portion and the engaging portion are disengaged, if the fuse cylinder is located inside the accommodating portion, the engaging portion may be caught by the protruding portion or the engaging portion may be the fuse cylinder. It may get caught on the side. As a result, the position of the fuse cylinder may shift downward. However, in the operating rod 70, the fuse cylinder 12 is pushed out of the accommodating portion 72 by the extension force of the coil spring 88. Therefore, it is possible to prevent the engaging portion 85 from being caught on the protruding portion 42, the side surface of the fuse cylinder 12, and the like, and it is possible to prevent the fuse cylinder 12 from being displaced downward. Even if the accommodating portion 72 is caught on the side surface of the fuse cylinder 12, the fuse cylinder 12 is pressed upward by the extension force of the coil spring 88, so that the fuse cylinder 12 does not shift downward.

(Other forms of operating rod)
Hereinafter, the operation rods of the second to fourth embodiments will be described with reference to FIGS. 8 to 10. The operation rod described below is a modified example of the operation rod 70, and the form of the accommodating portion is different from that of the accommodating portion 72 of the operation rod 70. Therefore, in the following description, only the form of the accommodating portion will be described. Further, with respect to the accommodating unit described below, the description may be omitted by assigning the same reference number as the reference number assigned to the accommodating unit 72 for the configuration substantially the same as that of the accommodating unit 72. The cross section of the accommodating portion described below corresponds to the cross section at the position shown in FIG.

(Second Example)
In the accommodating portion 172 shown in FIG. 8, one end of the coil spring 88 is fixed to the bottom portion 86a of the first cylindrical portion 86. Therefore, the compression stroke of the coil spring 88 when the fuse cylinder 12 is accommodated in the accommodating portion 172 is longer than that of the accommodating portion 72 (first embodiment), and when the fuse cylinder 12 and the operating rod 70 are separated, the operator However, the distance at which the resistance of the coil spring 88 is felt becomes relatively long. Therefore, the operator can more reliably recognize whether or not the protrusion 42 and the engaging portion 85 are disengaged. Further, by fixing one end of the coil spring 88 to the bottom portion 86a, the length of the accommodating portion 172 in the axis CL direction can be shortened.

(Third Example)
In the accommodating portion 272 shown in FIG. 9, the contact plate 90 is arranged so that the bottom portion 90a is located outside the accommodating portion 272. In other words, the bottom 90a of the contact plate 90 projects from the tip of the second cylindrical portion 84 (the tip of the cover portion 82). In the accommodating portion 272, the positions of the bottom portion 90a and the bent portion of the contact plate 90 in the axis CL direction are opposite to the positions of the contact plate 90 in the accommodating portion 72. The accommodating portion 272 can more reliably push the fuse cylinder 12 out of the accommodating portion 272 when the fuse cylinder 12 and the operating rod 70 are separated. In the accommodating portion 272, one end of the coil spring 88 may be fixed to the bottom portion 86a of the first cylindrical portion 86 in the same manner as in the accommodating portion 172.

(Fourth Example)
In the accommodating portion 372 shown in FIG. 10, the contact plate 390 has a flat plate shape. The contact plate 390 is provided with a through hole 390b. The contact plate 390 has a simple structure and can receive the pressure of the coil spring 88 on the entire surface (bottom surface). Therefore, when the fuse cylinder 12 and the operation rod 70 are separated, the contact plate 390 can be stably moved in the axis CL direction, and the engaging portion 85 can be further suppressed from being caught in the fuse cylinder 12. In the accommodating portion 372, as in the accommodating portion 172, one end of the coil spring 88 may be fixed to the bottom portion 86a of the first cylindrical portion 86.

In the above embodiment, a mode in which the first through hole is provided at the bottom of the contact plate and the second through hole is provided at the side wall of the operation rod has been described. However, if a structure for discharging the arc-extinguishing gas generated in the high-pressure cutout to the outside is provided, the first through hole and / or the second through hole may be omitted.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above. In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

12: Fuse cylinder 42: Protruding portion 70 of the fuse cylinder: Operating rod 72: Accommodating portion 85: Engaging portion 88: Spring member 90: Contact plate 100: High-pressure cutout CL: Axis line of the accommodating portion

Claims (4)

An operating rod for attaching and detaching the fuse cylinder used in high-voltage cutouts.
A cylindrical housing that can accommodate the end of the fuse tube,
Engagement that is provided on the inner peripheral surface of the accommodating portion, extends in the circumferential direction of the accommodating portion, projects toward the axis side of the accommodating portion, and engages with the protruding portion provided on the outer peripheral surface of the fuse cylinder. Department and
It is provided with a spring member, one end of which is in contact with the inside of the housing and the other end of which is in contact with a contact plate that is in contact with the end of the fuse cylinder.
When fixing the fuse cylinder to the operating rod, the end of the fuse cylinder is brought into contact with the contact plate to compress the spring member, the fuse cylinder is inserted into the accommodating portion, and the protruding portion and the engaging portion are engaged with each other. Fix the fuse cylinder to the operation rod and
When separating the fuse cylinder from the operating rod, the operating rod separates the fuse from the operating rod by disengaging the protruding portion and the engaging portion and pushing the fuse cylinder out of the accommodating portion by the extension force of the spring member. The contact plate is provided with a first through hole,
A second through hole is provided on the side wall of the operation rod.
The operation rod according to claim 1, wherein the first through hole and the second through hole communicate with each other. The operating rod according to claim 1 or 2, wherein the contact plate includes a bottom portion that comes into contact with the end portion of the fuse cylinder, and a side wall portion that extends from the outer periphery of the bottom portion along the axis of the accommodating portion. The operation rod according to claim 3, wherein the contact plate is arranged in the accommodating portion so that the side wall portion surrounds the outer periphery of the fuse cylinder when the fuse cylinder is inserted into the accommodating portion.

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