JP2016143559A - High voltage dc power supply circuit breaker device - Google Patents

Abstract

PURPOSE: To provide a circuit breaker capable of cutting off a high-voltage DC current even although compact.CONSTITUTION: A circuit breaker has two sets of contacts arranged in series in a storage container, and two independent shutter plates (12) interposed between a movable contact (7A) and a fixed contact (10) when they are broken to cut off an arc are arranged therebetween. Front end parts of the shutter plates are made wedge-like and enter grooves formed in an opposed case to be suppressed from rebounding, and thus close a path of an arc without leaving any gap. Further, buffer parts (4A, 5A) are provided in a region where a movable electrode part including the movable contact and the storage container come into contact with each other.EFFECT: A plurality of shutter plates energized independently of one another are provided and certainty of operation can be enhanced. The shutter plates and movable electrode part are suppressed from rebounding so as to prevent an arc from being re-ignited and to securely cut off power supply.SELECTED DRAWING: Figure 3

Description

  The present invention is a high-voltage DC power supply shut-off device that detects an abnormality such as a short circuit or excessive heat generation of the device, and shuts off the power supply. The present invention relates to a voltage DC power supply cutoff device.

  In recent years, high-voltage DC power supplies have been used for indoor air conditioners of electric vehicles and temperature control devices for cooling electric circuits such as batteries.

  In these devices, if an abnormal current flows in the circuit due to a collision accident or the like, there is a risk of causing a serious accident such as overheating and fire due to excess current. The device was requested.

  In the case of a DC power supply, since there is no moment when the voltage applied between the contacts becomes zero during energization, unlike the AC power supply, the energization continues until the arc generated between the contacts disappears completely.

  In order to extinguish the arc, it is necessary to separate the contacts beyond the arc's sustainable distance.

  The higher the voltage applied between the terminals, the easier the arc lasts, and the contact switching mechanism of the high voltage DC power supply interrupting device needs to secure a sufficient contact separation distance for the arc to disappear.

As an arc extinguishing means of the interrupting device, for example,
The switching contact is arranged in an airtight container filled with an arc extinguishing gas.
Shield between the contacts with an insulating structure.
The magnetic field extends the arc beyond the distance between the contacts.
By opening the circuit at multiple contacts at the same time, the voltage applied across the contacts is divided to shorten the arc's duration.
Such a configuration has been proposed.

  The means for disposing the switching contact inside the closed container filled with the arc extinguishing gas suppresses the generation of the arc, and therefore the contact is not deteriorated and has excellent durability.

  However, providing a switching contact inside the sealed container requires a special process or process for sealing the container, making the structure complicated and making it difficult to reduce the size.

  When shielding between the contacts with an insulating structure, it is necessary to shield the contacts as quickly as possible in order to shorten the arc duration. For example, in Patent Document 1, in an interrupting device that interrupts an arc by inserting an insulating structure into one switching contact, a structure is provided in which a portion where the tip of the insulating structure is inserted beyond the shielding part is provided so that no gap is generated in the shielding part. What has been proposed.

  The insulation structure is urged by a spring or the like so that it can move quickly. However, when the size is reduced, the insulation structure collides with the moving end at high speed, and the insulation structure bounces back and creates a gap. The arc may resume.

  Further, if the insulating structure is moved at a high speed, a part of the insulating structure may be damaged when it collides with the moving end, and the arc may not be interrupted.

  The means for extending the arc by the magnetic field can be extinguished by shortening the movement of the contacts and increasing the distance of the arc. Patent Document 2 proposes a means for interrupting the arc with a shorter contact separation distance by combining the partial pressure of the arc by opening a plurality of switching contacts simultaneously and the extension of the arc by a magnetic field.

  However, in this structure, it is necessary to secure a space for extending the arc outside the contacts. In addition to securing a space for extending the arc, there is a limit to downsizing the interrupting device due to the arrangement of a magnet for extending the arc and a complicated contact drive mechanism. In addition, when the contact bounces back and forth, the contact interval is shortened again, and when it is severe, the contact re-contacts and the arc continues, which requires a contact separation distance, thus reducing the size of the device. Has its limits.

JP2012-212543

JP 2004-288604 A

  In a DC power supply, it is necessary to ensure a long distance between contacts that can interrupt the arc.

  Further, the higher the voltage is, the longer the arc lasts. Therefore, the circuit breaker corresponding to the high voltage becomes difficult to downsize.

  In addition, when an arc is interrupted by inserting an insulating structure between the contacts, it is necessary to shield the insulating structure quickly so that the insulating structure is not melted and destroyed by the high heat generated by the arc.

  Furthermore, the higher the voltage, the more likely the arc to recur or continue from the shielding gap. Therefore, it is necessary to increase the distance between the contacts and provide an overlapping part so that there is no gap in the shielding part between the contacts. There was a problem.

  For this reason, there is a problem that an electric device installed in a limited space such as an engine room of an automobile is not sufficiently downsized with a conventional shut-off device, and it is difficult to secure a place for mounting.

  Furthermore, there is a demand to double the blocking function in order to ensure blocking even when a failure occurs in the blocking function. However, when a plurality of shut-off devices are used, there is a problem that it is difficult to secure the mounting position, and there is a demand for a device that can shut down the high-voltage DC power supply with a small size.

  In particular, in a high voltage DC power supply cutoff device that is miniaturized with a structure in which an insulating structure such as a shutter plate is inserted between the contacts in order to interrupt the arc, the shutter plate rebounds with a momentum that closes at high speed, but for a short time, the shutter plate There is a problem that the insulating structure is destroyed by the arc because the strong arc continues due to the phenomenon that the open movable contact or the open movable contact bounces back and recontacts or the contacts approach each other. It was an obstacle to miniaturization.

  An object of the present invention is to provide a small high-voltage DC power supply interrupting device that can reliably interrupt an arc generated between contacts that interrupts the high-voltage DC power supply with a simple structure.

  In order to solve the above-described problems, the present invention provides a storage container made of an electrically insulating material, two fixed contacts disposed in the storage container, and a fixed contact with each of the fixed contacts. The movable electrode part is composed of a bypass plate having sufficient rigidity to fix and electrically connect the two movable contact points, and the movable electrode part is locked so as to keep the movable contact point and the fixed contact point in contact with each other. A latch that activates the latch to release the latch, a release spring that urges the movable electrode portion to be quickly separated from the fixed contact, and a contact that is inserted between the movable contact and the fixed contact. Two independent shutter plates that block arcs generated during the separation, and the shutter plates are contacted by the movable electrode portion when the fixed contact and the movable contact are held in contact with each other. When the trigger is operated, the latch is released and the movable electrode part is released. When the movable contact is separated from the fixed contact by the spring, the shutter plate is released and the shutter is released. The plates are inserted between the movable contact and the fixed contact by an independent shutter insertion mechanism, and an arc generated between the contacts is cut off.

  In addition, a blocking groove is provided on the wall surface of the storage container, and the blocking groove has a guide groove for instructing an operation direction of the shutter plate along the both sides of the shutter plate and a front end of the shutter plate. It is constituted by a shielding groove that inserts a portion and shields the space, and the arc is securely interrupted by closing the arc path of the arc generated between the contacts without any gap.

  Further, the front end portion of the shutter plate is bitten and held in the blocking groove when inserted between the contact points.

  In addition, the movable electrode portion and the storage container have a buffer portion in contact with the buffer portion, and the buffer portion reduces the moving speed of the movable electrode portion, and the impact caused by the collision between the member holding the movable electrode portion and the storage container. The movable electrode portion is structured to prevent the movable electrode portion from bouncing back to the fixed contact side.

  The movable electrode portion includes a moving block made of an electrically insulating material, and the movable contact is maintained in contact with the fixed contact by holding the moving block at a predetermined position by the latch, and the buffer The part is composed of a receiving part provided at one end of the moving block and a fitting part provided on the inner wall of the storage container facing the receiving part, and moves in contact while increasing the area where the receiving part and the fitting part are in contact with each other. By reducing the moving speed of the block, it is structured to prevent the moving block that has moved in the direction to quickly open the contact by the force of the separating spring from colliding with the inner wall of the storage container at high speed and bounce back to the fixed contact side. And

  In addition, the insertion portion and the receiving portion mesh with each other in a wedge shape, the speed at which the moving block moved in the direction of opening the contact collides with the inner wall of the storage container is reduced, and the bypass plate and the movable contact rebound to the fixed contact side. It is the structure which prevents.

  Further, the present invention is characterized in that a heat responsive member that changes its shape at a predetermined temperature is provided, and the trigger portion is configured by a change in shape of the heat responsive member provided integrally with the storage container.

  According to the present invention, the following effects can be achieved.

  (1) By providing a shutter plate that is driven independently between the two switching contacts and inserted between the contacts to provide a double arc breaking function, one of the breaking functions may be temporarily caused by an operational delay or rebound. Even if a gap or a malfunction occurs, the arc can be cut off and the energization can be cut off.

  (2) Inserting between the contacts to cut off the arc The shutter plate has a cut-off groove where the tip of the shutter plate collides with the inner wall of the case. The arc is surely interrupted.

  (3) By providing a buffer part that reduces the moving speed for moving the movable contact and the member holding the movable contact from the fixed contact, the movable contact collides with the moving end with the force of separation even between a short contact separation distance, Prevents contact with the moving shutter plate and prevents damage to the shutter plate. Thus, it is possible to prevent the arc from continuing or recurring between the contacts when the power is cut off, and to reliably cut off the high-voltage DC power supply even if the breaking device is downsized.

  (4) The trigger part is configured by a thermally responsive member provided inside the storage container of the shut-off device, and the power shut-off due to abnormal temperature can be performed by the shut-off device alone.

1 is an outline view of a high-voltage DC power supply cutoff device according to an embodiment of the present invention. 1 is an exploded perspective view of a high-voltage DC power supply cutoff device according to an embodiment of the present invention. It is a horizontal sectional view showing the internal structure of the state where the contact of the high voltage direct-current power supply cutoff device concerning one embodiment of this invention was closed. It is a horizontal sectional view showing the internal structure of the state where the contact of the high voltage direct-current power supply cutoff device concerning one embodiment of this invention was opened. It is a schematic diagram of the XX line cross section of FIG. FIG. 5 is a schematic cross-sectional view taken along line YY in FIG. 4. It is the elements on larger scale which show the state by which the shutter plate front-end | tip part of FIG. 6 was inserted in the interruption | blocking groove | channel.

  The purpose of the present invention is to reduce the size of the high-voltage DC power supply interrupting device, by providing a shutter plate having an independent insertion mechanism for each of the two sets of switching contacts so that an arc generated when the contacts are separated can be interrupted by each switching contact. In addition, the movable contact separated from the fixed contact reduces the collision speed with the moving end by the buffer provided at the moving end, so that the movable contact that collides with the moving end and bounces back against the shutter plate and the arc continues. Or it was realized by shutting off the power supply with a short contact separation distance to prevent recurrence.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an outline view of a high-voltage DC power supply cutoff device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a horizontal sectional view showing an internal structure in a state where contacts are closed. .

  The high-voltage direct-current power shutoff device 1 of the present invention has a storage container including a case 2, a base 3, an end plate 4 and an intermediate base 6 that are electrically insulating members.

  Opening and closing contacts arranged in series by two fixed contacts 10 and two movable contacts 7A facing the fixed contacts 10 are stored in the internal space of the storage container.

  The intermediate base 6 is provided with two shutter insertion holes 6A penetrating toward the space where the switching contacts are arranged, and the shutter plate 12 is arranged in each shutter insertion hole 6A so as to be movable back and forth.

  The case 2 is provided with an intermediate wall portion that prevents an arc from being generated between the two fixed contacts 10.

  The width between the inner wall and the intermediate wall of the case 2 is narrower than the respective opening ends of the shutter insertion hole 6A, and the three wall surfaces of the inner wall and the intermediate wall of the case 2 extend from the opening end of the shutter insertion hole 6A. A continuous shielding groove is carved.

  Among the shielding grooves, the guide grooves 2A each carved on the surface where the inner wall and the intermediate wall of the case 2 face each other extend between the bottom surfaces with the width from the shutter insertion hole 6A. When 12 is inserted from the shutter insertion hole, it moves along this guide groove 2A. The remaining one of the shielding grooves is a shielding groove 2B into which the tip of the shutter plate is inserted when the contact is opened.

  The moving block 5 is disposed so as to be able to move back and forth in a space for storing the switching contacts. As shown in FIG. 3, a release spring 15 is arranged between the overhang provided on both sides of the moving block 5 and the case 2, and is compressed when the contact is closed to release the moving block from the fixed contact. Energized in the direction.

  The two movable contacts 7 </ b> A are fixed to a bypass plate 7 </ b> B made of a conductive material such as a copper alloy having sufficient rigidity to constitute the movable electrode portion 7.

  The movable electrode portion 7 is composed of a movable contact, a bypass plate, and a moving block, and the bypass plate 7B is connected and supported to the moving block 5 by a shaft 8.

  The moving block 5 is urged away from the fixed contact 10 as described above, and is arranged so as to be movable along the inner wall of the case 2 and the intermediate base 6.

  Further, while the moving block 5 is held at the position where the contact is closed, the bypass plate 7B is normally urged from the moving block 5 to the fixed contact 10 side by the contact pressing spring 9 provided along the shaft 8, The movable contact 7 </ b> A is pressed so as not to open due to vibration generated by the use of.

  The fixed contact 10 is fixed to a connection terminal 11 made of copper or copper alloy fixed to the case 2.

  As shown in FIG. 1, the connection terminal 11 is provided with a wiring connection portion 11 </ b> A for connecting circuit wiring to a portion exposed from the storage container.

  The latch 13 is rotatably held in a recess (not shown) provided on the surface of the intermediate base 6 on the side in contact with the base 3.

  At one end, there is a locking hook 13A that moves in and out of the groove 6B that communicates from the recess by rotation.

  As shown in FIG. 5, when the shut-off device 1 is in a state before the protection operation, the locking hook 13 </ b> A presses a part of the moving block 5 inserted into the groove 6 </ b> B, pulls the moving block 5 away, and resists the urging force of the spring 15. And hold.

  The latch 13 has a passive end 13B at the end opposite to the locking hook 13A.

  During the protection operation, the passive end 13 </ b> B is pushed by a trigger portion described later to rotate the latch, and the locking hook 13 </ b> A at the other end releases the holding of the moving block 5, thereby performing a blocking operation as a circuit breaker.

  The two shutter plates 12 are arranged so as to be movable back and forth through a shutter insertion hole 6A provided in the intermediate base 6, and are each urged in a direction to be inserted between the contacts by an independent shutter insertion mechanism.

  In this embodiment, the shutter insertion mechanism is configured by a shutter insertion spring 14 held in a recess (not shown) provided on the surface of the intermediate base 6 on the side in contact with the base 3.

  While the contact is closed, as shown in FIG. 5, the shutter plate 12 is locked by a part of the movable electrode portion 7 to be described later, in this embodiment, by the bypass plate 7B in the vicinity of the tip, and in the contact direction. Is kept immovable.

  With the above configuration, the high-voltage DC power shutoff device 1 prior to the power shutoff operation is configured so that the movable block 5 is held on the movable block 5 by holding the movable block 5 on the fixed contact 10 side by the latch 13. Is pressed against the fixed contact 10 to electrically connect the two connection terminals 11.

  Next, the structure of the shut-off unit and the power shut-off operation of this embodiment will be described with reference to FIGS.

  5 and 6 are cross-sectional views of the main part of the storage container taken along line XX in FIG. 3 and line YY in FIG.

  5 and 6 omit illustration of the shutter insertion spring 14 and the presser spring 16C, and a part of the hatching of the base 3 and the intermediate base 6.

  The power-off operation is started when the trigger portion 16 pushes the passive end 13B of the latch 13. As a result, the latch 13 rotates and the locking hook 13A moves, and the holding of the moving block 5 is released.

  The moving block whose holding has been released moves away from the fixed contact 10 by the biasing force of the pulling spring 15. In the present embodiment, at this time, the two convex portions of the moving block 5 are pulled apart and pressed evenly by the spring 15 to prevent the parts from being tilted due to the biased biasing force and being unable to move. As a result, the moving block 5 can be quickly moved substantially parallel to the inner wall of the case 2. In addition, as long as it can urge equally to the movement of the moving block, not only a plurality of separating springs but also a single central part may be provided.

  Since the movable electrode portion 7 coupled and supported by the shaft 8 to the moving block 5 moves together with the moving block, the two movable contacts 7A are separated from the fixed contact 10 almost simultaneously. At the same time, an arc is generated between the movable contact 7 </ b> A and the fixed contact 10 that are separated during energization of the high-voltage DC power supply.

  Since the two contacts arranged in series with the power supply circuit are opened almost simultaneously, the voltage applied between each movable contact 7A and the fixed contact 10 is divided to be almost half of the voltage of the power supply circuit. Thereby, the interruption | blocking of the arc produced between each contact becomes easy.

  When the movable electrode portion 7 moves, the pressing near the front end portion 12A of the shutter plate locked by the bypass plate 7B is released, and the shutter plate 12 is inserted between the contacts by the urging force of the shutter insertion spring 14.

  Since the shutter plate 12 is inserted between the contact points with the side surfaces of the shutter plate 12 surrounded by the guide groove (shielding groove) 2A, the arc is driven between the case 2 having the shortest distance and the front end portion 12A of the shutter plate. The front end portion 12 </ b> A of the shutter plate has a slope inclined with respect to the moving direction of the shutter plate 12 between both side surfaces of the shutter plate 12.

The wall surface of the case 2 where the case 2 and the front end portion 12A of the shutter plate are in contact is provided with a blocking groove (shielding groove) 2B into which the front end portion 12A of the shutter plate is inserted.
The blocking groove 2B is provided with an inclined surface substantially parallel to the inclined surface of the front end portion 12A of the shutter plate.

  As shown in the partially enlarged view of FIG. 7, friction is generated when the front end 12A of the shutter plate comes into contact with the blocking groove 2B on the inclined surfaces, and the moving speed of the shutter plate 12 due to the urging force of the shutter insertion spring 14 is reduced. It is done.

  Furthermore, the shutter plate is prevented from colliding with the case 2 and rebounding when the front end portion 12A is guided to the back of the cutoff groove 2B by the slope of the cutoff groove 2B and the front end portion 12A and the cutoff groove 2B bite in a wedge shape. Can be removed.

  Thus, the shutter plate 12 can cut off the arc driven between the case 2 and the front end portion 12A of the shutter plate between the front end portion 12A and the blocking groove 2B.

  At this time, one end of the shutter plate 12 is left in the shutter insertion hole 6A, the front end portion 12A is inserted into the blocking groove 2B, and both end surfaces are formed on the shutter plate guiding groove (shielding groove) 2A provided on the inner wall and the intermediate wall of the case 2. Since it is surrounded, the space surrounded by the case 2 where the fixed contact 10 is arranged and the intermediate base 6 is partitioned by the shutter plate 12 and the fixed contact 10 is isolated in an isolated space.

  With the above configuration, the arc divided by opening the two contacts almost simultaneously is interrupted by the shutter plate, and the fixed contact 10 is isolated in an isolated space. Thus, it is possible to realize a small high-voltage DC power supply cutoff device 1 that can cut off the power supply.

  In addition, in this embodiment, a shutter plate and a shutter insertion mechanism are independently provided at each of two contact points that are opened almost at the same time, so that the interrupting function is doubled, thereby reducing the burden on the interrupting function per one by partial pressure. The certainty of operation at the time of failure should be improved.

  In this embodiment, the function is to prevent the rebound from the collision of the shutter plate by reducing the moving speed of the shutter plate by the slope provided at the part where the shutter plate and the case come into contact with each other, but it is possible to prevent the rebound from the collision of the shutter plate. As long as the shutter plate is locked by deformation or catching of the contact portion, the same function can be realized.

  In this embodiment, the shutter insertion spring 14 is constituted by a torsion spring that pushes the lower portion of the shutter plate 12 in the direction of insertion between the contacts as shown in FIG. 2, but if the shutter plate can be similarly energized, It goes without saying that the same function can be realized by other biasing means such as a leaf spring and a coil spring.

  In order to interrupt the arc when the contact is opened, the movable contact 7A is preferably separated from the fixed contact 10 as soon as possible to ensure a contact separation distance. However, if the circuit breaker is reduced in size, the movable distance of the moving block 5 is also limited. Therefore, the moving block 5 quickly pulled away by the pulling spring 15 collides with the end block 4 at a high speed while maintaining the speed, and the reaction block rebounds and temporarily returns to the fixed contact side. At this time, there is a possibility that the movable electrode portion 7 fixed to the moving block 5 comes into contact with the moving shutter plate 12 and breaks the shutter plate 12, thus failing to interrupt the arc.

  In order to prevent this and to ensure the interruption of the arc by the shutter plate 12, the moving block 5 that moves quickly by the urging force of the release spring 15 when the contact is released is decelerated at a position away from the fixed contact 10 to suppress rebound. It is necessary to fix.

  Therefore, in the present invention, a buffer portion that reduces the moving speed of the moving block due to the urging force of the pulling spring 15 is provided at a portion where the moving block 5 and the end plate 4 come into contact.

  In the present embodiment, a wedge-shaped fitting portion 4A is provided on the end plate 4, and a receiving portion 5A is provided at a position on the moving block 5 facing the fitting portion 4A.

  When the moving block 5 moved at a high speed by the urging force of the separating spring 15 when the contact is released reaches the end plate 4, the fitting portion 4 </ b> A of the end plate 4 is fitted into the receiving portion 5 </ b> A of the moving block 5.

  When the fitting portion 4A bites into the receiving portion 5A in a wedge shape, a frictional resistance is generated to reduce the moving speed of the moving block 5, and the moving block 5 is held and the moving block 5 is rebounded to move the movable electrode portion 7 and the shutter plate 12. Can be prevented from colliding. This prevents the shutter plate 12 from interrupting the arc reliably by preventing breakage of the shutter plate 12 and contact between the contacts before the shutter plate is fully closed and the arc continuing or recurring.

  The buffer portion may have a structure in which, for example, the contact portion of the buffer portion is deformed to absorb kinetic energy as long as the moving speed is reduced to such an extent that the moving block 5 does not rebound due to the reaction of the collision.

  Further, in this embodiment, an example in which the buffer portion is provided on the surface where the moving block 5 and the end plate 4 are in contact is shown. However, if the moving block 5 is prevented from rebounding, the moving block 5 and the case 2 or the moving block 5 are used. And may be provided on any surface where the intermediate base 6 contacts.

  In addition, if the movable electrode unit 7 is moved to a position where the shutter plate 12 can be inserted between the contacts, the movement of the movable block 5 can be restricted by a retaining structure that stops and moves the movable block 5. It does not matter if it restricts.

  Further, the present invention can provide an inexpensive high-voltage DC power supply interrupting device with reduced manufacturing cost without requiring a special member or manufacturing device for hermetically sealing the storage container because the arc can be interrupted in the air atmosphere. .

  Next, an embodiment of a trigger unit for operating this apparatus will be described with reference to FIGS.

  In the present embodiment, the trigger portion 16 is provided in a recess provided on a surface of the base 3 that does not contact the intermediate base, and is integrated with the storage container.

  The trigger portion 16 has a thermally responsive member 16A arranged to change its shape at a predetermined temperature and push the passive end 13B of the latch.

  Furthermore, the trigger portion 16 is directed from the base 3 toward the cover 16B from the base 3 with a cover 16B made of a metal material having good thermal conductivity covering the heat responsive member 16A and a load that does not hinder changes in temperature of the heat responsive member 16A. And a presser spring 16C that presses it.

  When the high-voltage DC power supply cutoff device 1 is installed, the cover 16B is attached so as to contact a desired position for detecting the temperature of the device that shuts off the power supply. Thus, the heat of the device at the contacted portion is transmitted to the heat responsive member 16A through the cover 16B.

  When heat exceeding a predetermined temperature is transmitted to the heat responsive member 16A due to abnormality of the power supply circuit or a device to which the power supply circuit is connected, the heat responsive member 16A changes its shape to a position where the passive end 13B of the latch is pushed.

  When the latch 13 pushed by the thermally responsive member 16A rotates, the holding of the moving block 5 by the locking hook 13A is released, and the high voltage DC power supply cutoff device 1 starts a cutoff operation.

  In order to minimize damage to the circuit and the device in which an abnormality has occurred, it is preferable that the trigger unit 16 operates so as to quickly shut off the power supply when the upper limit temperature of the circuit is exceeded.

  For example, the trigger portion 16 of the present embodiment uses a disc-shaped indentation formed at the center of a disk-shaped heat-responsive member 16A, which is reversely deformed by a snap operation at a predetermined temperature, and the latch 13 is passively moved at the reverse deformation portion. It is comprised so that the end 13B may be pushed.

  With the above configuration, the trigger portion 16 is not displaced to push the passive end 13B below a predetermined temperature, and when the predetermined temperature is exceeded, the heat responsive member 16A is reversely deformed to push the passive end 13B to latch 13 Can be rotated.

  Further, the shape of snapping the above-mentioned heat-responsive member can realize sufficient deformation to start the shut-off operation by pushing the passive end 13B even if the heat-responsive member 16 is downsized, so the trigger portion can be downsized. Therefore, it is possible to reduce the size of the high-voltage DC power supply cutoff device 1 that cuts off the high-voltage DC power supply at a predetermined temperature.

  According to the high voltage DC power supply shut-off device 1 of the present embodiment, by providing the trigger unit 16 that starts the shut-off operation at a predetermined temperature integrally with the storage container, an abnormality occurs in the control device of the high voltage DC power supply and the power supply Even if it is not possible to shut off the power supply, it is possible to detect and judge the heat generated by the power supply circuit or device abnormality with the shutoff device alone and quickly shut off the high voltage DC power supply, minimizing damage to the power supply circuit or device due to overheating. It can be stopped to the limit.

  In addition, since a control circuit that determines an abnormality for the shut-off device and instructs the shut-off operation is not necessary, the wiring of the circuit can be simplified, and installation at a limited installation location is facilitated.

  The trigger portion 16 of the present embodiment uses a disk-like heat-responsive member that reverses at a predetermined temperature, but the latch 13 is rotated at a temperature that requires a shut-off operation to release the holding of the moving block 5. If possible, a member that continuously deforms with respect to a temperature change can be used, for example.

  Further, the trigger portion is not limited to one that operates with respect to temperature, and any means other than temperature, such as pressure or acceleration, can be used as long as it can release the holding of the moving block 5 by pressing the passive end 13B of the latch. You can also.

  A member that mechanically interlocks the trigger portion and the latch can be added, and the trigger portion and the high-voltage DC power supply shut-off device 1 can be arranged at some distance.

  For example, it is also possible to insert a waterproof trigger inside the hermetic hot water heater and place the high-voltage DC power shut-off device 1 outside the hot water heater.

  As described above, according to the high voltage DC power supply cutoff device of the present invention, the shutter plate provided independently between the two open contacts is respectively inserted to double the cutoff function and the separated movable contact is provided. To realize a compact high-voltage DC power supply interrupter that can reliably interrupt the arc with a short contact distance by providing a buffer that prevents the shutter plate from bouncing back and reaching the moment before the arc is completed. Can do.

1: High-voltage DC power supply cutoff device 2: Case 2A: Induction groove (shielding groove)
2B: Blocking groove (shielding groove)
3: Base 4: End plate 4A: Insertion part 5: Moving block 5A: Receiving part 6: Intermediate base 6A: Shutter insertion hole 6B: Groove 7: Movable electrode part 7A: Movable contact 7B: Bypass plate 8: Shaft 9: Contact Pressure spring 10: Fixed contact 11: Connection terminal 11A: Wiring connection portion 12: Shutter plate 12A: Tip portion 13: Latch 13A: Locking hook 13B: Passive end 14: Shutter insertion spring 15: Release spring 16: Trigger portion 16A: Thermally responsive member 16B: Cover 16C: Presser spring

Claims (7)

A storage container made of an electrically insulating material;
Two fixed contacts arranged in the storage container;
A movable electrode portion composed of a bypass plate having sufficient rigidity to fix and electrically connect two movable contacts paired with each fixed contact;
A latch for locking the movable electrode portion so as to maintain the state where the movable contact and the fixed contact are in contact with each other;
A trigger part for operating this latch and releasing the locking;
A release spring that urges the movable electrode portion to quickly pull away from the fixed contact;
Two independent shutter plates that are inserted between each movable contact and fixed contact and interrupt an arc generated when the contact is separated;
When the shutter plate is held in a state where the fixed contact and the movable contact are in contact with each other, the movable electrode part is held so as not to be inserted between the contacts,
In response to the operation of the trigger part, the latch is released, the movable electrode part is released, and when the movable contact is separated from the fixed contact by the spring, the holding of each shutter plate is released,
A high-voltage DC circuit breaker in which each shutter plate is inserted between a movable contact and a fixed contact by an independent shutter insertion mechanism to interrupt an arc generated between the contacts. A blocking groove is provided on the wall surface of the storage container,
This blocking groove is composed of a guiding groove that indicates the operating direction of the shutter plate along its direction by entering both sides of the shutter plate, and a blocking groove that blocks the space by inserting the tip of the shutter plate,
The high-voltage DC circuit breaker according to claim 1, wherein the arc is reliably interrupted by closing the arc path of the arc generated between the contacts without any gap. 3. The high voltage DC circuit breaker according to claim 2, wherein a front end portion of the shutter plate is bitten and held in the blocking groove when inserted between the contact points. A buffer portion is provided at a site where the movable electrode portion and the storage container come into contact with each other,
The buffer part reduces the moving speed of the movable electrode part,
The high electrode according to any one of claims 1 to 3, wherein the movable electrode portion is prevented from bouncing back to the fixed contact side by an impact caused by a collision between the member holding the movable electrode portion and the storage container. Voltage DC circuit breaker. The movable electrode part includes a moving block made of an electrically insulating material,
The movable contact is maintained in contact with the fixed contact by holding the moving block in place by the latch,
The buffer portion comprises a receiving portion provided at one end of the moving block, and a fitting portion provided on the inner wall of the storage container facing the receiving portion,
By increasing the area where the receiving portion and the fitting portion are in contact with each other and reducing the moving speed of the moving block, the moving block that has moved in the direction to quickly open the contact point due to the force of the release spring is fastened to the inner wall of the storage container. The high-voltage DC circuit breaker according to claim 4, wherein the high-voltage DC circuit breaker is configured to prevent collision and rebound to the fixed contact side. A structure in which the insertion portion and the receiving portion mesh with each other in a wedge shape, and the speed at which the moving block moved in the direction of opening the contact collides with the inner wall of the storage container is reduced to prevent the bypass plate and the movable contact from bouncing back to the fixed contact side. The high-voltage DC circuit breaker according to claim 5, wherein 7. The trigger part is configured by a change in shape of a thermally responsive member integrally formed with the storage container, the thermally responsive member having a shape that changes at a predetermined temperature. 8. The high voltage DC circuit breaker described in 1.

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