JP4564799B2 - High voltage load switch - Google Patents

Description

 The present invention relates to a high voltage load switch that is small in size and can be reduced in thickness, can be reduced in installation space, and can further reduce the size of a cubicle type high voltage power receiving facility.

 Cubicle type high-voltage power receiving equipment (power receiving equipment in which equipment for receiving high-voltage power is simplified and wired as much as possible, and compactly housed in an installed metal box. JIS C 4620. Hereinafter, also simply referred to as “cubicle”) For example, a high-pressure (air AC) load switch is used. The high voltage load switch is provided with a current limiting fuse (PF) when used in a PF-S type cubicle, and can conduct and open / close the high piezoelectric path in a normal use state. An electric circuit including a current limiting fuse is provided for each phase of the three-phase alternating current, and three electric circuits having a total of three current limiting fuses are provided, and the short-circuit current is interrupted by the current limiting fuse. At this time, in the conventional high-voltage load switch with a fuse, even if one current limiting fuse is blown, the other two-phase circuits remain closed (energized state), and therefore, a phase loss operation is performed. It sometimes had a negative effect on electrical equipment.

 Therefore, for example, in the load switch with fuse according to the invention disclosed in Patent Document 1, in order to prevent an open phase operation that occurs when only two of the three phases or only one phase is operated during the fuse blowing operation. When one fuse is blown, the opening / closing part is mechanically opened in conjunction with the trip mechanism of the switch.

 A specific conventional high-voltage load switch will be described with reference to FIG. FIG. 8 is a perspective view showing the entire structure of the conventional high-voltage load switch when it is opened. As shown in FIG. 8, in the conventional high voltage load switch 41, three synthetic resin fuse bases 51A,... Are fixed on a substrate 42 made of a plated steel plate, and three current limiting fuses are attached thereto. 52A, 52B, and 52C are attached to the substrate 42 at an angle. Three blade plates 45A, 45B, 45C made of a conductive metal are attached to the upper ends of the three synthetic resin operation rods 46A,. When the blade 48 is tilted toward the latch key 49 against the elastic force of a spring (not shown), the three blade plates 45A,... Slide in the directions of the arrows and enter the arc extinguishing chambers 44A,. The high voltage load switch 41 is closed (connected) by joining with a metal joining member. By closing the engaging portion 49a of the latch key 49 by engaging with the bolt 48a of the rotating arm 48, the closed state is maintained.

When one of the three current limiting fuses 52A,... Is blown by a short circuit or the like, the rod protrudes from the upper end of the current limiting fuse to rotate one of the strikers 50A, 50B, 50C. The crank mechanism 47A,... Is actuated to rotate a shaft (not shown) to rotate the latch key 49, the engaging portion 49a is disengaged from the bolt 48a of the rotating arm 48, and the rotating arm 48 is spring-loaded. The blades 45A,... Are instantaneously returned to the position shown in the figure by the elastic force of the moment, and the high pressure load switch 41 is opened (opened) by momentarily detaching from the arc extinguishing chambers 44A,. In this way, open phase operation when the fuse is blown is prevented.
Japanese Patent Publication No. 58-43846

 However, the conventional high-voltage load switch including the above-described high-voltage load switch 41 has a structure in which the longitudinal direction of the current limiting fuse and the sliding direction of the three blade plates are not parallel to the substrate. The height from the substrate to the uppermost part (the farthest part) of the high-voltage load switch is increased, and there is a problem that a large space is required for mounting.

 Accordingly, the present invention minimizes the distance from the board to the farthest part of the high voltage load switch and the length of the high voltage load switch by sliding a plurality of blade plates in a direction substantially parallel to the board. It is an object of the present invention to provide a high-voltage load switch that can be suppressed and the installation space can be further reduced.

The high-pressure load switch according to the invention of claim 1 is fixed to the spring having one end fixed to the substrate, the main shaft that fixes the other end of the spring, and converts the elastic force into rotational power, and the main shaft. A free end portion of the operating rod which is converted into a linear reciprocating motion with respect to the rotation of the main shaft, and a free end portion of the operating rod fixed to the main shaft is pivotally supported and freely reciprocated. A plurality of blade plates made of a conductive metal guided in a plurality, and a plurality of blades that open and close an electric circuit by joining and separating from a plurality of joining members made of a conductive metal in the arc extinguishing chamber by reciprocating movement of the plurality of blade plates Each of the plurality of blade plates and the plurality of joining members is maintained in an electrically joined state with the plurality of joining members in the arc extinguishing chamber against the elastic force of the pair of opening / closing portions and the spring, Main shaft shuff A locking mechanism that prohibits rotation of the plurality of blades, and a plurality of the plurality of blade plates that are attached to the substrate substantially in parallel with the substrate and the plurality of sets of opening / closing portions via an insulator and are electrically connected to the plurality of blade plates, respectively. When at least one of the current limiting fuse and the plurality of current limiting fuses is blown, the locking mechanism is released, and at the same time, the plurality of blade plates are all moved away from each other, and the electric circuit is moved by the elastic force of the spring. And an electric circuit opening mechanism that opens instantaneously.

According to a second aspect of the present invention, there is provided the high-voltage load switch according to the first or second aspect , wherein the lock mechanism includes a rotating arm attached to the spindle shaft, and the rotating arm is configured to open and close the plurality of sets. A latch key that engages in the connected state and prohibits rotation of the rotating arm, and the engagement is released by pressing the latch key, and the spindle shaft is Each of the plurality of blade plates and the plurality of joining members is electrically opened from the plurality of joining members in the arc extinguishing chamber by the elastic force of the spring.

According to a third aspect of the present invention, there is provided the high-voltage load switch according to any one of the first to third aspects , wherein the motion converting portion is rotated as the rotating arm directly connected to the main shaft is rotated. The plurality of operating rods are supported so as to rise when tilted with respect to the substrate, and to descend when approaching perpendicular to the substrate, and the free end portion of the operating rod is moved by the movement of the spindle shaft. The rotation of the main shaft is converted into a linear reciprocating motion.

Pressure load switch according to the invention of claim 4, one of the spring arrangement of claim 1 to claim 4, in which were installed two between the substrate and the main spindle.

According to a fifth aspect of the present invention, there is provided a high voltage load switch according to any one of the second to eighth aspects , wherein the electric circuit opening mechanism is configured such that when at least one of a plurality of current limiting fuses is blown, the current limiting A striker that is rotated by being pushed by a rod that protrudes from the tip of the fuse rotates a shaft that is rotatably supported by the substrate, and presses the latch key with a pressing portion provided near the tip of the shaft, The lock mechanism is released, and at the same time, the plurality of blade plates are all moved away from each other, and the electric circuit is instantly opened by the elastic force of the spring.

The high-pressure load switch according to the invention of claim 1 includes a spring having one end fixed to the substrate, a main shaft that fixes the other end of the spring and converts its elastic force into rotational power, and an operation fixed to the main shaft. A motion converter that converts the free end of the rod into a linear reciprocating motion with respect to the rotation of the main shaft, and a conductive support that is pivotally supported by the free end of the operating rod fixed to the main shaft and reciprocally guided. A plurality of blade plates made of metal, a plurality of sets of opening and closing portions that open and close the electric circuit by joining and separating from a plurality of joining members made of conductive metal in the arc extinguishing chamber by reciprocating movement of the plurality of blade plates, A lock that keeps each of the plurality of blade plates and the plurality of joining members electrically joined to the plurality of joining members in the arc extinguishing chamber and resists rotation of the spindle shaft against the elastic force of the spring. Mechanism and base And a plurality of current limiting fuses that are attached substantially in parallel to the substrate and the plurality of sets of opening / closing portions via an insulator and electrically connected to the plurality of blade plates, respectively, and at least one of the current limiting fuses When the book is melted, the lock mechanism is released, and at the same time, a plurality of blade plates are all moved in the separating direction, and an electric circuit opening mechanism that instantaneously opens the electric circuit with the elastic force of the spring is provided.

 As a result, it is possible to continue to flow a three-phase or single-phase high-voltage current in a normal state, and when an excessive current flows and at least one of a plurality of current-limiting fuses is blown, the circuit opening mechanism is a lock mechanism. By releasing, the plurality of blade plates are separated from the plurality of joining members instantly by the elastic force of the spring, and the plurality of sets of opening / closing portions are opened to reliably prevent the phase loss operation. And since the plurality of blade plates reciprocate linearly by the motion converter, the reciprocating motion is parallel to the substrate, and the plurality of current limiting fuses are also mounted substantially parallel to the substrate and the plurality of sets of opening and closing portions, The distance from the board to the farthest part can be reduced to a distance corresponding to the minimum insulation distance between a plurality of blade plates made of conductive metal and the board, and the installation space for the high-voltage load switch can be reduced. .

Furthermore, when the plurality of blade plates are not joined to the plurality of joining members, the end portions thereof are exposed. In this way, even in a high-voltage load switch that is usually installed in the back of a power receiving facility such as a cubicle and can only be seen from the front, it is only necessary to check whether the ends of multiple blade plates are exposed. Thus, it is possible to easily determine whether the high voltage load switch is in an electrically connected state or in an open state.

In addition, by sliding multiple blade plates in a direction substantially parallel to the board, the distance from the board to the farthest part of the high-voltage load switch and the length of the high-voltage load switch are minimized and installed. The space can be further reduced, and a high-voltage load switch that can reliably determine whether it is in an electrically connected state or in an open state by visual recognition.

In addition, when the blade plates are not joined with the joining members, the end portions of the blade plates are exposed, so it is easier to confirm that the high-voltage load switch is open. Can do.

 In this way, by sliding a plurality of blade plates in a direction substantially parallel to the substrate and mounting a plurality of current limiting fuses in parallel with the substrate, the distance from the substrate to the farthest part of the high-voltage load switch And it becomes a high voltage | pressure load switch which can suppress the length of a high voltage | pressure load switch to the required minimum, and can make installation space smaller.

The lock mechanism of the high-voltage load switch according to the invention of claim 2 is such that the rotating arm attached to the spindle shaft and the rotating arm are engaged in a connected state when a plurality of sets of opening / closing parts are electrically connected. Each of the plurality of blade plates and the plurality of joining members is released by the elastic force of the spring. Is configured to be electrically opened to a plurality of joining members in the arc extinguishing chamber.

Therefore, the electrical connection state is maintained in a normal state with a simple configuration, and in an emergency or when necessary, the latch key is disengaged and the spindle shaft is rotated by the elastic force of the spring to move the blade plates in parallel. Thus, it is possible to release the electrical connection in an instant by cutting off the joining with the plurality of joining members in the arc extinguishing chamber.

 In this way, by sliding a plurality of blade plates in a direction substantially parallel to the substrate, the distance from the substrate to the farthest part of the high-voltage load switch and the length of the high-voltage load switch are minimized. Thus, the mounting space can be further reduced, and the high-voltage load switch can be opened and closed with a simple configuration.

The motion conversion portion of the high-voltage load switch according to the invention of claim 3 is raised when the plurality of operating rods are tilted with respect to the substrate as the rotating arm directly connected to the main shaft rotates. It is supported so as to descend when approaching perpendicular to the substrate, and the free end portion of the operating rod is converted into a linear reciprocating motion with respect to the rotation of the main shaft by moving the main shaft.

 That is, in the plurality of operation rods having a plurality of blade plates rotatably attached to the upper end, when the main shaft is fixed so as to be integrally rotatable when inclined with respect to the substrate, the position of the spindle shaft is high. If the spindle shaft rotates and the operating rods become nearly perpendicular to the substrate, the blade plates will be lifted to a higher position as they are, so the fulcrum of the spindle shaft Smoothly move to a lower position to maintain the height of multiple blade plates. When multiple operating rods pass through a state perpendicular to the substrate and become inclined again, the spindle shaft fulcrum moves smoothly to a higher position to maintain the height of the multiple blade plates. To do.

Therefore, by rotating the fulcrum of the spindle shaft in a reverse arc so as to cancel the upper end of the multiple operating rods that move in a circular arc in normal rotation, A plurality of blade plates can be reciprocated linearly while maintaining the height of the upper end of the operation rod substantially constant.

 In this way, by sliding a plurality of blade plates in a direction substantially parallel to the substrate, the distance from the substrate to the farthest part of the high-voltage load switch and the length of the high-voltage load switch are minimized. Thus, a high-pressure load switch that can further reduce the installation space.

In the high voltage load switch according to the invention of claim 4 , two springs are installed between the substrate and the main shaft. As long as the opening / closing part is in a normal connection state, a biasing force is always applied to the spring, and metal fatigue also occurs when opening / closing is repeated hundreds of times. Therefore, by installing two springs, the reliability of the opening force of the blade plate is improved as compared with the case of using only one spring.

 In this way, the distance from the substrate to the farthest part of the high-voltage load switch and the length of the high-voltage load switch can be minimized, and the installation space can be reduced and the blade plate can be opened. A reliable high-voltage load switch with improved force reliability.

When the circuit opening mechanism of the high-voltage load switch according to the invention of claim 5 is configured such that when at least one of the plurality of current limiting fuses is blown, the striker that is rotated by being pushed by the rod that protrudes from the tip of the current limiting fuse is a substrate. The shaft supported rotatably is rotated, the latch key is pressed by the pressing portion provided near the tip of the shaft, the lock mechanism is released, and at the same time, all the blade plates are moved in the separating direction. The electric circuit is opened instantly by the elastic force of the spring.

Accordingly, at least one of the plurality of current limiting fuses is blown, and the striker rotates by the rod that pops out at the same time to rotate the shaft, so that the latch key is removed, and the plurality of blade plates are separated by the elastic force of the spring. The plurality of sets of open / close portions are opened by sliding substantially parallel to the current limiting fuse, and the open phase operation when at least one of the plurality of current limiting fuses is blown can be reliably prevented.

 In this way, by sliding a plurality of blade plates in a direction substantially parallel to the substrate, the distance from the substrate to the farthest part of the high-voltage load switch and the length of the high-voltage load switch are minimized. Thus, the mounting space can be further reduced, and a high-voltage load switch that can reliably prevent the phase-opening operation when at least one of the plurality of current limiting fuses is blown is obtained.

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

Embodiment 1
First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an overall configuration of a high-voltage load switch in an open state according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing an overall configuration of the high-voltage load switch in the open state according to the first embodiment of the present invention. Fig.3 (a) is a right view which shows the structure of the high voltage | pressure load switch in the open state concerning Embodiment 1 of this invention, (b) is a left view. FIG. 4 is an explanatory view showing a parallel slide mechanism of the blade plate of the high voltage load switch according to the first embodiment of the present invention.

 As shown in FIG. 1, the high-voltage load switch 1 according to the first embodiment includes three pieces made of polyacetal resin via a cylindrical support base 3 made of epoxy resin on a substrate 2 made of steel plate. The arc extinguishing chambers 4A, 4B, 4C (the arc extinguishing chambers 4B, 4C are not shown in FIG. 1) are fixed, and are made of copper that fits into the copper joining members in the arc extinguishing chambers 4A, 4B, 4C. The blade plates 5A, 5B, and 5C are rotatably attached by pins 10 in the upper end slits of three operation rods 6A, 6B, and 6C made of epoxy resin at the rear ends. On the other hand, the tips of the blade plates 5A, 5B, and 5C are respectively positioned in front of the openings of the arc extinguishing chambers 4A, 4B, and 4C, and have appropriate heights for the fuse support bases 11A, 11B, and 11C made of epoxy resin. The blade plates 5A, 5B, and 5C are supported substantially parallel to the substrate 2 by opening through holes and passing the tips of the blade plates 5A, 5B, and 5C.

 The lower ends of the three operation rods 6A, 6B, and 6C made of epoxy resin are fixed to a main shaft 7 made of a hexagonal steel rod so as to be integrally rotatable. As will be described later, the pair of support members 15 and 16 are fixed to the substrate 2 with two bolts, respectively, and the ends of the pair of support members 15 and 16 are further tightened with the connecting rod 17 to be nut-tightened. , Forming a strong support structure. A substantially circular through hole that is about twice as large as the diameter of the main shaft 7 is formed in the center of the support members 15 and 16, and two through-lengths are formed in a “C” shape across the substantially circular through hole. A pair of guide plates 18 each having a hole formed therein and being fixed to the spindle shaft 7 with the support members 15 and 16 sandwiched from both sides are provided. The main shaft 7 protrudes from the substantially circular through hole and is prevented from coming off by a set of two guide plates 18, which are connected by a connecting rod that penetrates the through long hole.

 A rotating arm 8 made of a plated steel plate is firmly fixed to the tip of the main shaft 7 so as to be integrally rotatable. The rotating arm 8 is brought close to a latch key 9 that is rotatably attached to the substrate 2. By rotating against the elastic force of a spring (not shown), the three operating rods 6A, 6B, 6C are rotated integrally with the main shaft 7 to rotate the three blade plates 5A, 5B, 5C. The tip is slid so as to enter the arc extinguishing chambers 4A, 4B, 4C, respectively. In this way, the three sets of opening / closing portions are electrically connected. To maintain this state, the locking portion 9a of the latch key 9 is locked to the locking bolt 8a attached to the rotating arm 8, The rotating arm 8 is held against the elastic force of the spring that is not applied.

 Three current limiting fuses 12A, 12B, and 12C are firmly mounted on the fuse support bases 11A, 11B, and 11C by three pairs of stoppers 13A, 33A, 13B, 33B, 13C, and 33C each made of a pair of steel plates. Is held in. And, on the front side of the annular electrodes at both ends of the three current limiting fuses 12A, 12B, 12C, copper output terminal plates 14A, 14B, 14C and a copper contact plate integrated with each other are in close contact, It is pressed by a steel plate holding plate from above.

 The stoppers 33A, 33B, and 33C transmit power between the three blade plates 5A, 5B, and 5C by flexible braided leads 35A, 35B, and 35C. The braided leads 35A, 35B, and 35C are formed of a material having flexibility that does not hinder the movement of the three blade plates 5A, 5B, and 5C. When the present invention is carried out, the blade plates 5A, 5B, 5C are electrically connected by a brush that comes into sliding contact, and the stoppers 33A, 33B, 33C are directly connected by a conductive plate. Good.

 Next, it will be described in more detail with reference to the plan view of FIG. As shown in FIG. 2, the three operating rods 6A, 6B, and 6C are installed at positions slightly shifted to the left side from directly below the current limiting fuses 12A, 12B, and 12C. The blade plates 5A, 5B, 5C, which are rotatably mounted by the pin 10 in the upper end slits of the 6C, are also shifted to the left side from directly below the current limiting fuses 12A, 12B, 12C, respectively, Even when the switch 1 is fixed to the back surface of the cubicle in the mounting holes 25 at the four corners of the substrate 2, the blade plates 5A, 5B, and 5C can be seen from the front, so that the high pressure can be obtained. Whether the load switch 1 is in a connected state or an open state can be reliably determined visually.

 In this way, by using a structure in which the blade plates 5A, 5B, and 5C are shifted in the same direction, it is only necessary to manufacture three identical members as the fuse support bases 11A, 11B, and 11C, thereby improving productivity. To do.

 As described above, the three current limiting fuses 12A, 12B, and 12C are firmly held by the stoppers 13A, 33A, 13B, 33B, 13C, and 33C each made of a pair of steel plates. A through hole is formed in the central portion of 33A, 33B, and 33C through which a rod that pops out when current limiting fuses 12A, 12B, and 12C are blown out is penetrated. The protruding rod rotates any of the strikers 26A, 26B, and 26C attached close to the stoppers 33A, 33B, and 33C, and via any of the connected crank mechanisms 27A, 27B, and 27C, By rotating the shaft 28, the high-voltage load switch 1 is opened as described later.

 Moreover, the electric circuit of the high-voltage load switch 1 according to the first embodiment is a high-voltage (6600 V) side copper input terminal board 21A, 21B, 21C attached to the arc extinguishing chambers 4A, 4B, 4C made of polyacetal resin. Constitutes a joining member in the arc extinguishing chambers 4A, 4B, 4C as it is, and the three arms sliding substantially parallel to the substrate 2 by rotating the rotating arm 8 until it engages with the latch key 9 are formed. Copper connection plates 14D, 14E, and 14F that are electrically connected by fitting the tips of copper blade plates 5A, 5B, and 5C and being in sliding contact with the three blade plates 5A, 5B, and 5C are: As a whole, the three current limiting fuses 12A, 12B, and 12C are electrically connected as a contact plate that sandwiches the annular electrode at one end from both sides. The annular electrodes at the other ends of the current limiting fuses 12A, 12B, and 12C are also sandwiched from both sides by copper contact plates 14A, 14B, and 14C. The output terminal plates 14A, 14B, and 14C are connected to the transformer.

 Further, as shown by a broken line in FIG. 2, a spring 22 is housed in the right corner on the back side of the central portion that is one step higher than the substrate 2, and both ends of the spring 22 are hook-shaped. The “U” -shaped stopper 2 a welded to the back side of the substrate 2 is engaged, and the other hook is engaged to the “U” -shaped stopper 7 a welded to the obliquely lower surface of the main shaft 7. Yes. Accordingly, when the rotating arm 8 is rotated from the state shown in the drawing in a direction to engage the latch key 9, the stopper 7 a rotates to the back side of the main shaft 7, so that the spring 22 is pulled and extended. A biasing force to return to the original position acts.

 The pair of support members 15 and 16 that support the spindle shaft 7 are firmly fixed by two bolts 15d and 16d in the stepped portion of the substrate 2. A small spring 30 attached to the latch key 9 is used to bias the latch key 9 so that the latch key 9 rotates toward the side where the engaging portion 9a of the latch key 9 engages with the engaging bolt 8a of the rotating arm 8. Is.

 Next, a mechanism for opening the three sets of opening / closing sections when the current limiting fuses 12A, 12B, 12C are blown will be described with reference to FIG. As shown in FIGS. 3 (a) and 3 (b), the three current limiting fuses 12A, (12B,) 12C are stoppers 13A, 33A, (13B, 33B,) 13C, each made of a pair of steel plates. The strikers 26A, 26B, and 26C are rotatably attached to the stoppers 33A, 33B, and 33C and connected to the shaft 28 via the crank mechanisms 27A, 27B, and 27C. ing. A pressing portion 29 is provided in the vicinity of the end portion of the shaft 28. In FIG. 3A, the engaging portion 9a of the latch key 9 at a position engaged with the engaging bolt 8a of the rotating arm 8 is The pressing portion 29 presses the pressed portion 9c of the latch key 9 so as to rotate the latch key 9 clockwise against the urging force of the small spring 30 so as to be disengaged from the engagement bolt 8a. To do.

 As described with reference to FIG. 2, when the rotating arm 8 is tilted against the elastic force of the spring 22, the three operating rods 6 </ b> A, 6 </ b> B, 6 </ b> C rotate integrally with the main shaft 7. The blade plates 5A, 5B, and 5C slide substantially parallel to the substrate 2 and fit into the joining members 21A, 21B, and 21C in the arc extinguishing chambers 4A, 4B, and 4C, and the three sets of opening / closing portions are connected. Become. Due to the urging force of the small spring 30, the engaging portion 9a of the latch key 9 is engaged with the engaging bolt 8a of the rotating arm 8, and this state is maintained.

 If any of the current limiting fuses 12A, 12B, 12C is blown, a rod that protrudes from any of the current limiting fuses 12A, 12B, 12C through a through hole formed in the center of the stoppers 33A, 33B, 33C is applicable. The strikers 26A, 26B, and 26C to be rotated are rotated, and the shaft 28 is rotated through the corresponding crank mechanisms 27A, 27B, and 27C. As a result, the pressing portion 29 in the vicinity of one end of the shaft 28 presses the pressed portion 9c of the latch key 9 to rotate the latch key 9 clockwise from the state of FIG. 3A, and the engaging portion 9a is engaged. The rotating arm 8 is instantaneously returned to the position shown in the figure by the elastic force of the spring 22 after being removed from the bolt 8a, and the three blade plates 5A, 5B, 5C are also slid substantially parallel to the substrate 2 to extinguish the arc chambers 4A, 4B. , 4C, and three sets of opening / closing parts are opened in an instant.

 Next, when the rotating arm 8 fixed to one end of the spindle shaft 7 is rotated in a direction approaching the substrate 2, the three blade plates 5A, 5B, 5C are slid substantially parallel to the substrate 2. Will be described with reference to FIG. In FIG. 4, the movement viewed from the support plate 16 side will be described. However, the support plate 15 is symmetric with the support plate 16, and the symmetric operation is performed on the support plate 15 side.

 As shown in FIG. 4, a substantially circular through hole 16a that is about twice as large as the diameter of the spindle shaft 7 is formed in the center of the support member 16, and the "H" is sandwiched between the substantially circular through holes 16a. Are formed with two through-holes 16b, 16c and a pair of guide plates 18 fixed to the spindle shaft 7 with the support member 16 sandwiched from both sides. The guide plate 18 is connected by connecting rods 18a and 18b penetrating the two through-holes 16b and 16c, and the main shaft 7 protrudes from the substantially circular through-hole 16a and is prevented from coming off by a pair of guide plates 18 Has been.

 Of the two connecting rods 18a and 18b of the guide plate 18 shown in FIG. 4 (a), the electrical path is closed between the three blade plates 5A, 5B and 5C when the connecting rod 18b is lowered and the connecting rod 18a is raised. When sliding in the direction of the arrow, first, the three operating rods 6A, 6B, 6C are rotated integrally with the spindle shaft 7 with the connecting rod 18b as a fulcrum, and the connecting rod 18a side of the guide plate 18 is lowered. The three operating rods 6A, 6B, and 6C are also gradually lowered, and as the three operating rods 6A, 6B, and 6C approach the vertical direction with respect to the substrate 2, as shown in FIG. Closely adheres to the bottom of the substantially circular through hole 16a.

 When the three operating rods 6A, 6B, 6C pass through the state perpendicular to the substrate 2 with the main shaft 7 as a fulcrum, the three operating rods 6A together with the main shaft 7 are used with the connecting rod 18a of the guide plate 18 as a fulcrum. , 6B, 6C gradually rise while rotating, and the blade plates 5A, 5B, 5C with the connecting rod 18a side of the guide plate 18 lowered and the connecting rod 18b side raised as shown in FIG. 4C. Slides to a position where it fits into the joining members 21A, 21B, 21C in the arc extinguishing chambers 4A, 4B, 4C (not shown), and the three sets of opening / closing portions are connected, and the rotating arm 8 is fixed by the latch key 9 When the latch key 9 is released, this process is performed in an instant by the strong biasing force of the spring 22 in the reverse sequence of FIG. 4 (c) → FIG. 4 (b) → FIG. 4 (a). It is.

 That is, the three operation rods 6A, 6B, 6C having the three blade plates 5A, 5B, 5C rotatably attached to the upper ends rotate together when they are inclined with respect to the substrate 2. When the main shaft 7 fixed so as to be in a high position and the main shaft 7 is rotated so that the three operation rods 6A, 6B, 6C are nearly perpendicular to the substrate 2, the number 3 remains as it is. Since the blade plates 5A, 5B, and 5C are lifted to a high position, the fulcrum of the main shaft 7 is smoothly moved to a low position to maintain the height of the three blade plates 5A, 5B, and 5C. When the three operating rods 6A, 6B, and 6C pass through a state perpendicular to the substrate 2 and become inclined, the fulcrum of the spindle shaft 7 smoothly moves to a high position, The height of the blade plates 5A, 5B, 5C is maintained.

 In this way, in the normal rotation, a circular arc is drawn with the fulcrum of the main shaft 7 being reversed with respect to the upper ends of the three operating rods 6A, 6B, 6C whose height moves while drawing a circular arc. The three blade plates 5A, 5B, 5C can be linearly slid while keeping the height of the upper ends of the three operating rods 6A, 6B, 6C substantially constant. Since the three blade plates 5A, 5B, 5C are slid substantially parallel to the current limiting fuses 12A, 12B, 12C to provide three sets of opening / closing portions, the three sheets constituting the opening / closing portion are provided. The blade plates 5A, 5B, 5C and the substrate 2 can be brought close to the minimum insulation distance, and the upper surfaces of the current limiting fuses 12A, 12B, 12C that are located farthest from the substrate are brought close to the substrate 2 to the limit. be able to.

 Thus, in the high-voltage load switch 1 according to the first embodiment, three sheets are provided in a direction substantially parallel to the longitudinal direction of the current limiting fuses 12A, 12B, and 12C arranged in a direction substantially parallel to the substrate 2. The blade plate 5A, 5B, 5C is slid, and the three blade plates 5A, 5B, 5C are arranged below the current limiting fuses 12A, 12B, 12C. The distance to the distant portion and the length of the high-voltage load switch 1 can be minimized, and the installation space can be further reduced. In addition, since the three blade plates 5A, 5B, 5C are moved to the left side and arranged at positions that are not hidden by the current limiting fuses 12A, 12B, 12C, the high-voltage load switch 1 is opened when viewed from the front. Whether it is in a state or a connected state can be easily confirmed visually.

Embodiment 2
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5: is a top view which shows the whole structure of the high voltage | pressure load switch in the open state concerning Embodiment 2 of this invention. Since the structure of the high-voltage load switch 31 according to the second embodiment is the same as that of the high-voltage load switch 1 of the first embodiment except for a part, the same members / portions are denoted by the same reference numerals. Description is omitted.

 The high-voltage load switch 31 according to the second embodiment is different from the high-voltage load switch 1 according to the first embodiment, as shown in FIG. 5, in the outer side of the three operation rods 6A, 6B, 6C. The operating rods 6A and 6C are installed at positions slightly shifted inward from directly below the current limiting fuses 12A and 12C, respectively. Therefore, the operating rods 6A and 6C are rotatably mounted by the pins 10 in the upper end slits of the operating rods 6A and 6C. The blade plates 5A and 5C are also located at positions shifted inward from directly below the current limiting fuses 12A and 12C. Along with this, the arc extinguishing chambers 4A and 4C are also installed at positions shifted inward, and the width of the substrate 2 can be saved by bringing the outer members inward in this way.

 Even when the high-voltage load switch 31 is fixed to the back surface of the cubicle in the mounting holes 25 at the four corners of the substrate 2 so that FIG. 5 is a front view, the two blade plates 5A and 5C are viewed from the front. Since it looks good, it can be reliably judged visually whether the high-voltage load switch 31 is in an electrically connected state or in an open state.

Embodiment 3
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 6: is a bottom view which shows the whole structure of the high voltage | pressure load switch in the open state concerning Embodiment 3 of this invention. Since the structure of the high-voltage load switch 32 according to the third embodiment is the same as that of the high-voltage load switch 1 of the first embodiment except for a part, the same members / portions are denoted by the same reference numerals. Description is omitted.

 The high-voltage load switch 32 according to the third embodiment is different from the high-voltage load switch 1 according to the first embodiment in that two springs 22A, 22B between the substrate 2 and the main shaft 7 are shown in FIG. 22B is installed. That is, both ends of the springs 22A and 22B are hook-shaped, and one hook of the spring 22A is engaged with the “U” shaped stopper 2a welded to the back side of the substrate 2, and the other hook is the main shaft. The shaft 7 is engaged with a “U” shaped stopper 7 a welded to a diagonally lower surface of the shaft 7. Also, one hook of the spring 22B engages with a “U” shaped stopper 2b welded to the back side of the substrate 2, and the other hook of “U” welded to an obliquely lower surface of the spindle shaft 7. It engages with the letter-shaped stopper 7b.

 As a result, when the pivot arm 8 is pivoted from the state shown in the figure in a direction to engage with the latch key 9, the stoppers 7a and 7b rotate to the back side of the main shaft 7, so that the two springs 22A and 22B are pulled. The urging force that extends and returns the rotating arm 8 to its original position acts more strongly. As long as the opening / closing portion is in a normal connection state, the springs 22A and 22B are constantly applied with an urging force, and metal fatigue occurs when the opening / closing is repeated hundreds of times. Therefore, by installing two springs 22A and 22B, the reliability of the opening force of the blade plate is improved as compared with the case of using only one spring. In addition, even if one of the springs 22A and 22B is damaged due to these causes, the high-pressure load switch 32 operates normally if the other spring is normal.

 Thus, in the high voltage load switch 32 according to the third embodiment, the distance from the substrate 2 to the farthest part of the high voltage load switch 32 and the length of the high voltage load switch 32 are minimized. As a result, the mounting space can be further reduced, and the reliability of the opening force of the blade plate is improved as compared with the case where only one spring is provided. Further, even when one of the springs 22A and 22B is broken, the switch is a more reliable high-voltage load switch that does not cause a situation in which the switch is not opened even if an overcurrent flows.

Embodiment 4
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7: is a perspective view which shows the principal part structure of the high voltage | pressure load switch in the open state concerning Embodiment 4 of this invention.

 In each of the above embodiments, the three blade plates 5A, 5B, 5C are arranged so that the wide surfaces (short direction) are substantially perpendicular to the substrate 2, but the three blades It is also possible to arrange the wide surfaces of the plates 5A, 5B and 5C so as to be substantially parallel to the substrate 2.

 That is, as shown in FIG. 7, the end of the blade plate 5A is rounded to form a pipe-shaped shaft 37A. As a result, three blade plates and three current-limiting fuses can be brought closer to the substrate by the width of the blade plate, and the center line of the three blade plates (or one or two of them) is set to 3 The blade plate protrudes just by slightly shifting from the center line of the insulator supporting the current limiting fuse of the book, so that the position and position of the blade plate can be visually confirmed from the front.

 Further, in each of the above embodiments, an example in which a polyacetal resin and an epoxy resin are used as an insulator has been shown, but other synthetic resins, insulators, and the like may be used as an insulator.

 In practicing the present invention, the configuration, shape, quantity, material, size, connection relationship, and the like of other parts of the high-voltage load switch are not limited to the above embodiments.

FIG. 1 is a perspective view showing an overall configuration of a high-voltage load switch in an open state according to Embodiment 1 of the present invention. FIG. 2 is a plan view showing an overall configuration of the high-voltage load switch in the open state according to the first embodiment of the present invention. Fig.3 (a) is a right view which shows the structure of the high voltage | pressure load switch in the open state concerning Embodiment 1 of this invention, (b) is a left view. FIG. 4 is an explanatory view showing a parallel slide mechanism of the blade plate of the high voltage load switch according to the first embodiment of the present invention. FIG. 5: is a top view which shows the whole structure of the high voltage | pressure load switch in the open state concerning Embodiment 2 of this invention. FIG. 6: is a bottom view which shows the whole structure of the high voltage | pressure load switch in the open state concerning Embodiment 3 of this invention. FIG. 7: is a perspective view which shows the principal part structure of the high voltage | pressure load switch in the open state concerning Embodiment 4 of this invention. FIG. 8 is a perspective view showing the entire structure of the conventional high-voltage load switch when it is opened.

1, 31, 32 High-voltage load switch 2 Substrate 4A, 4B, 4C Arc extinguishing chamber 5A, 5B, 5C Blade plate 6A, 6B, 6C Operating rod 7 Main shaft 8 Rotating arm 9 Latch key 12A, 12B, 12C Current limiting fuse 21A, 21B, 21C Joining member 22, 22A, 22B Spring 26A, 26B, 26C Striker 28 Shaft 29 Pressing part

Claims (5)

A spring with one end fixed to the substrate;
A main shaft that fixes the other end of the spring and converts its elastic force into rotational force;
A motion conversion unit that converts a free end portion of the operating rod fixed to the main shaft so as to freely rotate into a linear reciprocating motion with respect to the rotation of the main shaft;
Wherein is supported by a free end of the operating rod which is fixed to the main spindle, the linear reciprocating movement of the blades plates and the plurality of blades plate made of linear reciprocably guided conductive metal, A plurality of opening and closing portions for opening and closing the electric circuit by joining and separating from a plurality of joining members made of conductive metal in the arc extinguishing chamber;
Locks against the elastic force of the spring, each of said plurality of joint members and said plurality of blades plate maintaining electrically bonded state by the arc extinguishing chamber, to prohibit the rotation of the spindle shaft Mechanism,
Substantially parallel mounted between the substrate and the plurality of sets of closing part with an insulating material on the substrate, positioned above the plurality of blades plate, and said plurality of blades plate and the plurality of bonding members A plurality of blade plates that are electrically connected to the plurality of blade plates, respectively , at a position where the exposure of the end portions of the plurality of blade plates on the side of the plurality of bonding members is visible. Current limiting fuses,
When at least one of the plurality of current limiting fuses is blown, the locking mechanism is released, and at the same time, the plurality of blade plates are all moved away from the plurality of joining members to move the electric path to the elastic force of the spring. A high-voltage load switch comprising an electric circuit opening mechanism that opens instantaneously at The lock mechanism engages in a connected state when the turning arm attached to the spindle shaft and the plurality of sets of opening / closing portions are in an electrically connected state, and prohibits the turning of the turning arm. and a latch key, the engagement is released by pressing the latch key, electricity by the elastic force of the spindle shaft is the spring, each of said plurality of blades plate and the plurality of bonding members in extinguishing chamber high load break switch according to claim 1, characterized in that to to open. The motion converter, the said main spindle is connected directly As the pivot arm is pivoted, when said plurality of operating rod is inclined with respect to the substrate is increased, perpendicular to the substrate is supported so as to descend when approaching, claim 1, characterized in that the arrangement for converting the free end of the operating rod into a linear reciprocating motion with respect to the rotation of the spindle shaft by the movement of the main spindle or The high voltage load switch according to claim 2 . The high-pressure load switch according to any one of claims 1 to 3 , wherein two springs are installed between the substrate and the main shaft. The path opening mechanism, when at least one of said plurality of current limiting fuses are blown, the striker which is pushed by the rod rotation fly out from the tip of the current limiting fuse, is rotatably supported on said substrate The shaft is rotated, the latch key is pressed by a pressing portion provided in the vicinity of the tip of the shaft, the lock mechanism is released, and at the same time, all of the plurality of blade plates are moved away from each other, and the electric path is moved to the spring. The high-pressure load switch according to any one of claims 1 to 4 , wherein the high-pressure load switch is opened instantly by the elastic force of the switch.

Images