JP2005222871A - Dc relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dc relay which can be miniaturized with a simple structure, and also can interrupt dc in a plurality of pairs of contacts in a short time. <P>SOLUTION: This dc relay has a plurality of pairs of contacts which can be opened and closed while having stationary contacts 110U, 110M, 110D on one side and movable contacts 120U, 120M, 120D on the other side, and a single driving mechanism (solenoid 200) to open and close each pair of contacts. Each pair of contacts are arranged in the driving direction of the driving mechanism. These plurality of pairs of contacts 100U, 100M, 100D each function as relay parts. Therefore, a plurality of relay parts can be opened and closed by a single driving mechanism, and the size of this relay can be miniaturized as a whole. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a DC relay. In particular, the present invention relates to a DC relay capable of opening and closing a plurality of relay units with a small configuration.

  In recent years, high voltage (about 300V) vehicles such as hybrid vehicles and fuel cell vehicles have been developed due to environmental problems. These automobiles are provided with a control circuit comprising a high-voltage main battery and a high-voltage circuit. Further, since the main battery is a DC high voltage, it is necessary to disconnect the main battery from the control circuit in the event of an accident, and a DC relay with a mechanical contact is provided between the main battery and the control circuit.

  An example is shown in FIG. The power supply circuit of this hybrid vehicle converts a direct current from the main battery 10 into an alternating current through an inverter 20 and supplies the alternating current to the motor 30. Here, between the main battery 10 and the inverter 20, a total of three relay units, that is, a preliminary charging relay unit 41, a plus side main relay unit 42, and a minus side main relay unit 43 are provided. When the ignition key of the vehicle is turned on, the negative main relay unit 43 and the preliminary charging relay unit 41 are turned on in this order, and charging of the capacitor 50 starts. At this time, a large inrush current is restricted by the current limiting register 60. After the capacitor 50 is charged, the positive main relay unit 42 is turned on, power supply to the drive circuit of the motor 30 is started, and the preliminary charging relay unit 41 is turned off. When the ignition key is turned off, the plus side main relay unit 42 and the minus side main relay unit 43 are turned off, and the energization between the main battery 10 and the inverter 20 is cut off.

  This relay is mounted by using three single relay units or by unitizing three single relay units. Each relay unit shuts off the DC high voltage by opening a pair of contacts that can be opened and closed, but since the arc generated at that time becomes very large, the breaking speed is very slow, extremely difficult.

  Therefore, conventionally, there is a structure (see, for example, Patent Document 1) in which a magnet is installed in the arc generating portion and the arc is stretched by Lorentz force. There is also a structure (see, for example, Patent Document 2) in which a gas having a large cooling effect, such as hydrogen, is enclosed in an arc generating portion to suppress the generation of an arc. Furthermore, a magnet and a gas that suppresses the generation of an arc may be used in combination (see, for example, Patent Document 1).

JP-A-8-203368 (FIG. 1) JP-A-9-320411

  However, the conventional relay has a problem that it is very difficult to reduce the size.

(1) It is difficult to reduce the size of the entire relay structure including the three relay units.
Each relay unit requires a drive mechanism that opens and closes a contact pair. Normally, a solenoid is used for the drive mechanism, but the solenoid occupies a considerable volume in each relay unit. For this reason, three solenoids are required to use the three relay units, which increases the size of the entire relay.

(2) It is difficult to downsize the structure of each relay unit.
As shown in Patent Document 1, when a magnet is installed in an arc generating portion and the arc is stretched by the action of a magnetic field, it is necessary to secure an amount of arc stretching necessary for immediate interruption of the relay portion. Therefore, it is necessary to secure a space for extending the arc and to arrange a magnet having a magnetic force corresponding to the amount of arc extension. As a result, there is a problem that each relay unit becomes large.

  On the other hand, as shown in Patent Document 2, in the case of a structure that suppresses the generation of an arc with a gas such as hydrogen, it is necessary to have a case in which the gas can be completely sealed in the case. In addition, in order to increase the heat resistance against the arc, it is necessary to increase the thickness of the case, and as a result, the case size increases.

  As described above, in the conventional relay, it is very difficult to realize a downsizing that can be mounted in a limited space of an automobile without degrading the interruption characteristic.

  Therefore, a main object of the present invention is to provide a direct current relay that can cut off direct current in a short time while having a simple structure and being miniaturized.

  The present invention achieves the above object by opening and closing a plurality of contact pairs with a single drive mechanism.

  The DC relay of the present invention has a plurality of openable and closable contact pairs, one of which is a fixed contact and the other is a movable contact, and a single drive mechanism that opens and closes each contact pair. Each contact pair is arranged in the drive direction of the drive mechanism.

  This relay has a plurality of contact pairs for a single drive mechanism. Since the plurality of contact pairs are configured to be openable and closable, each of the contact pairs functions as a relay unit. As a result, a plurality of relay units can be opened and closed by a single drive mechanism, and the size of the entire relay having a plurality of contact pairs can be reduced.

  Also, by arranging a plurality of contact pairs in the drive direction of the drive mechanism, each contact pair can be opened and closed more stably than when a plurality of contact pairs are arranged in parallel in a direction orthogonal to the drive direction. . For example, when a solenoid having a drive shaft is used as a drive mechanism, if a plurality of contact pairs are arranged in the advance / retreat direction (vertical direction) of the drive shaft, a plurality of contacts in a direction (lateral direction) orthogonal to the advance / retreat direction of the drive shaft Compared with the case where a pair is arranged, the distance between the contact pair and the drive shaft can be reduced. Therefore, the influence exerted on the pressing force when closing the movable contact and the fixed contact due to the deflection between the drive shaft and each contact pair can be reduced, and the number of contact pairs can be increased with a minimum space. In particular, if the distance from the drive shaft to each contact pair is the same, variation in the pressing force for each contact pair can be suppressed, and more stable opening and closing can be performed.

  Each contact pair includes a fixed contact that can be opened and closed and a movable contact. More specifically, one of the fixed contacts is an input contact and the other is an output contact, and the movable contact is configured to connect the input contact and the output contact when the fixed contact is closed. According to this configuration, the fixed contact or the movable contact can be a multi-contact, and the voltage can be divided to cut off in a shorter time.

  Of each contact pair, the fixed contact is supported and fixed to, for example, a case described later. On the other hand, the movable contact may be mounted on a drive shaft of a drive mechanism such as a solenoid with an interval. More specifically, a plurality of conductive plates serving as movable contacts are penetrated by the drive shaft, and the conductive plates are held at intervals.

  Here, each contact pair may have the same gap when the contact pair is opened, or at least some of the gaps may be different from other gaps. If the gaps of all the contact pairs are the same, all the contact pairs can be opened and closed simultaneously by driving the movable contacts by the drive mechanism. Further, if the gap of one contact pair is different from the gap of another contact pair, these contact pairs can be opened and closed with a time difference.

  In the relay of the present invention, the movable contact is preferably urged toward the fixed contact with an elastic material. This biasing can stabilize the contact state of the movable contact with the fixed contact even if there is some variation in the shape and arrangement of the movable contact.

  More specifically, it is preferable to have a first elastic material that urges each movable contact toward the opposite fixed contact but does not urge the adjacent movable contact. For example, a plurality of conductive plates (movable contacts) are arranged at intervals on the drive shaft of the solenoid, and a flange fixed to the drive shaft is provided above each conductive plate. A compression coil spring (first elastic material) that is fitted to the drive shaft is disposed between the upper surface of each flange and the lower surface of each conductive plate. According to this configuration, each movable contact is not interlocked with the adjacent movable contact depending on the compression state of each compression coil spring, and the amount of compression of the compression coil spring is determined only by the advance / retreat position of the drive shaft. . Therefore, the spring constant of each compression coil spring can be selected without depending on the spring constants of other compression coil springs, and the open / close state of each contact pair can be easily controlled.

  On the other hand, it is also desirable to have a second elastic material that urges each movable contact toward the opposed fixed contact and urges adjacent movable contacts in a direction away from each other. For example, a plurality of conductive plates (movable contacts) are arranged at intervals on the drive shaft of the solenoid, and a compression coil spring (second elastic material) fitted on the drive shaft is arranged between the conductive plates. According to this configuration, although the positions of the adjacent movable contacts are affected by the compression state of the compression coil spring interposed therebetween, overcompression of the compression coil spring can be prevented and stable pressing can be performed. Each movable contact can be pressed against the fixed contact by pressure.

  As these first and second elastic materials, in addition to conductive materials such as metals, insulating materials such as plastics can be used. In particular, for the second elastic material, in order to insulate adjacent movable contacts, (1) use an insulating spring, (2) use a conductive spring with an insulating coating, (3) It is desirable to interpose an insulating washer between the both ends of the conductive spring and the movable contact. As the insulating washer, ceramic or plastic is preferably used.

  Further, it is desirable that the drive mechanism is a solenoid having a drive shaft, and the solenoid has a drive shaft elastic member for biasing the drive shaft in a direction in which each contact pair opens. Conventionally, a coil spring that urges the movable contact in the opening direction is arranged between the fixed contact and the movable contact, so that the free space between the contacts is small, and the coil spring is easily affected by the arc, so the cost is low. High heat-resistant coil springs were required. The present invention uses an elastic material for the drive shaft that urges the drive shaft in the contact opening direction inside the solenoid, thereby increasing the contact opening speed while avoiding the effects of free space between the contacts and the arc. As a result, the interruption performance of the relay can be improved. In particular, since the free space can be increased, the arc diffusion effect is increased, the relay can be shut off in a short time, and a high heat-resistant spring is not required, so that the cost can be reduced. Examples of the elastic material for the drive shaft include a compression coil spring.

  The relay of the present invention preferably includes a magnet for distorting an arc generated between the fixed contact and the movable contact. By forming a magnetic field between the contacts, the arc generated at the time of interruption can be distorted and stretched to improve the interruption characteristic. For example, this magnet is arranged so as to form a magnetic field in a direction orthogonal to the opening / closing direction of the contact pair. In particular, it is preferable to dispose the magnet so that the arc generated between the input contact and the movable contact and the arc generated between the output contact and the movable contact are distorted in a direction away from each other. By this magnet arrangement, it is possible to avoid that the distorted arcs are connected to each other and the interruption characteristic is deteriorated. Further, this magnet may be provided for each contact pair, or a magnet common to a plurality of contact pairs may be provided. In the latter case, since a magnet is shared by a plurality of contact pairs, the number of parts can be reduced.

  The plurality of contact pairs are preferably housed in a case. By storing the contact pair in the case, it is possible to prevent foreign matter such as dust from being interposed between the contacts and reducing the breaking characteristics. An insulating material such as ceramic or plastic can be suitably used for the case. In particular, if one of the fixed contacts is an input contact and the other is an output contact, and the movable contact is configured to connect the input contact and the output contact when the fixed contact is closed, the arc generation time can be reduced. However, it is possible to use an inexpensive plastic that is inferior in heat resistance to ceramic.

  In this case, it is preferable that the driving mechanism and the case are coupled to each other in the driving direction of the driving mechanism by screws. Conventionally, a part of the case and the driving mechanism are overlapped, and the overlapping portion is screwed in a direction orthogonal to the driving direction. In this case, in order to finely adjust the position of the driving mechanism, the screw hole is a long hole extending in the driving direction. For this reason, the case sometimes deviates from the driving mechanism as the relay is driven. According to the present invention, when the drive mechanism is a solenoid, for example, when the drive mechanism is a solenoid, the drive mechanism is connected to the case by screwing in the forward / backward direction of the drive shaft, so The direction is the same direction. Therefore, even if the relay is used repeatedly, the case does not shift with respect to the drive mechanism. As a result, variation in distance between the contacts can be suppressed, a stable contact state of the contacts can be maintained, and the contacts can be reliably brought into a non-contact state.

  The drive mechanism such as a solenoid is desirably exposed outside the case. If the drive mechanism is exposed outside the case, it is not necessary to cover the drive mechanism itself with the case, and the relay can be miniaturized. Further, since heat can be effectively dissipated when the solenoid is energized, the temperature rise inside the relay can be suppressed, and the influence of heat on the contact is reduced.

  According to the present invention, a plurality of contact pairs, that is, a plurality of relay units, can be opened and closed by a single drive mechanism, and the overall size of a relay having a plurality of relay units can be reduced.

  Embodiments of the present invention will be described below.

<Example 1>
The relay of the present invention will be described with reference to FIG. This relay has one solenoid 200 and three openable / closable contact pairs 100U, 100M, and 100D. By driving the solenoid 200, the contact pairs 100U, 100M, and 100D are opened and closed. 100U, 100M, and 100D function as a relay unit.

  The solenoid 200 has a drive shaft 210 that is pushed upward in FIG. 1 when turned on and retracts downward when turned off. As shown in FIG. 2, a part of the drive shaft 210 is accommodated in the solenoid body 220, and is urged downward by a compression coil spring 230 (drive shaft elastic material) inside the body 220. It is configured.

  On the other hand, the three contact pairs 100U, 100M, and 100D are arranged in parallel in the drive direction of the drive shaft 210, that is, in the vertical direction (FIG. 1). Each contact pair 100U, 100M, and 100D includes a fixed contact 110U (111U and 112U in FIG. 1), 110M (111M and 112M) and 110D (111D and 112D) and movable contacts 120U, 120M, and 120D.

  Among them, the fixed contacts 110U, 110M, 110D consist of the input contacts 111U, 111M, 111D and the output contacts 112U, 112M, 112D, and when the contact pair 100U, 100M, 100D is closed, the current is the input contacts 111U, 111M, 111D. Are output from the output contacts 112U, 112M, and 112D. Metal blocks are used for the input contacts 111U, 111M, 111D and the output contacts 112U, 112M, 112D, and are fixed to a case (not shown) with the drive shaft 210 interposed therebetween. Here, the width between the input and output contacts is narrowed as the upper fixed contact 110U, and the width between the input and output contacts is widened as the lower fixed contact 110D.

  Each movable contact 120U, 120M, 120D is held at a distance from the drive shaft 210. When the contact pair 100U, 100M, 100D is closed, the input contact 111U, 111M, 111D and the output contact 112U, 112M, 112D Connect between. Each movable contact 120U, 120M, 120D is composed of a disk-shaped metal plate having a hole in the center, and four flange members 300U, 300M, 300D, 300B and three compression coil springs are attached to the drive shaft 210. 400U, 400M, 400D (first elastic material) is used. The flange members 300U, 300M, 300D, and 300B are made of an insulating material, and the pipe portions 310U, 310M, 310D, and 310B that are fixed to the drive shaft 210, and a flange that protrudes in the radial direction above the pipe portions 310U, 310M, and 310D Part 320U, 320M, 320D, 320B. The compression coil springs 400U, 400M, and 400D are fitted to the outside of the drive shaft 210 so that the lower ends thereof are in contact with the collar portions 320B, 320M, and 320D and the upper ends are in contact with the movable contacts 120U, 120M, and 120D. In this example, springs having the same spring constant and the same free length were used. That is, each movable contact 120U, 120M, 120D is pressed from the lower surface side to the compression coil springs 400U, 400M, 400D, and the upper surface side is pressed by the collar portions 320U, 320M, 320D to be positioned. In this example, the intervals between the flange members 300U, 300M, 300D, and 300B are made the same, and the gaps between the movable contacts 120U, 120M, and 120D and the fixed contacts 110U, 110M, and 110D are made the same. By positioning these flange members 300U, 300M, 300D, 300B and compression coil springs 400U, 400M, 400D, each movable contact 120U, 120M, 120D simultaneously contacts the fixed contact when pushing up the drive shaft 210 of the solenoid, When retracted downward, it is arranged so as to leave the fixed contacts 110U, 110M, 110D.

  Further, a metal plate having a larger area than the lower movable contact 120D was used. With this configuration, the movable contacts 120U, 120M, and 120D can be opened / closed with respect to the fixed contacts 110U, 110M, and 110D that have wider widths between the input and output contacts toward the bottom. According to the configuration of the fixed contacts 110U, 110M, 110D and the movable contacts 120U, 120M, 120D, the fixed contacts 110U, 110M, 110D are arranged so that they do not overlap at least partly in the vertical direction, and the fixed contacts 110U, 110M, A lead (not shown) connected to 110D can be pulled upward.

  According to the relay having the above configuration, when the solenoid 200 is turned on, the drive shaft 210 is pushed up, and accordingly, each movable contact is simultaneously brought into contact with the fixed contacts 110U, 110M, 110D, and each contact pair is closed. At this time, the input contacts 111U, 111M, 111D and the output contacts 112U, 112M, 112D are connected via the movable contacts 120U, 120M, 120D, and energization is performed from the input contact side to the output contact side. On the other hand, when the solenoid 210 is turned off, the drive shaft is quickly retracted downward by the action of the compression coil spring, and the fixed contacts 110U, 110M, 110D and the movable contacts 120U, 120M, 120D are opened. By this opening operation, the direct current flowing from the input contacts 110U, 110M, 110D to the output contacts 112U, 112M, 112D can be cut off. Therefore, if each contact pair functions as one relay unit, a relay in which three relay units are operated by one solenoid 200 can be configured, and the size of the entire relay can be reduced.

  In particular, in this configuration, the compression coil springs 400U, 400M, and 400D energize only one movable contact and do not energize adjacent movable contacts at the same time. Only 210 advance / retreat positions are determined. Therefore, the spring constant of each compression coil spring 400U, 400M, 400D can be selected without depending on the spring constant of other compression coil springs.

  In the first embodiment described above, the shape of the metal plate of the movable contact is not limited to a disk shape. For example, a rectangular plate may be used. In addition, the gap between the fixed contact and the movable contact may be changed by a part of the contact pair. For example, if only the upper contact pair has a larger gap than the other contact pairs, the lower contact pair 100D and the intermediate contact pair 100M are closed first when the solenoid 200 is turned on, and the upper contact pair is separated with a time difference. 100U can be closed. Conversely, when the solenoid 200 is turned off, the lower contact pair 100D and the intermediate contact pair 100M can be opened first, and the upper contact pair 100U can be opened with a time difference.

<Example 2>
Next, based on FIG. 3, the relay of the present invention having a configuration different from that of the first embodiment will be described. The second embodiment is also common to the first embodiment in that it has one solenoid 200 and three contact points that can be opened and closed. However, in this example, a part of the flange member in the first embodiment is eliminated, and among the movable contacts 120U, 120M, 120D constituting the contact pair, adjacent movable contacts are connected to compression coil springs 500U, 500M, 500D (second It is configured to be urged by an elastic material.

  That is, the flange member is fixed only to the front end and the rear end of the drive shaft. Compression coil springs 500U, 500M, and 500D are disposed between the flange member on the rear end side and the lower movable contact, between the lower movable contact and the intermediate movable contact, and between the intermediate movable contact and the upper movable contact. . As a result, each movable contact is linked to the adjacent movable contact via the compression coil springs 500D, 500M, and 500U, and the position of each movable contact 120U, 120M, and 120D is the compression coil springs 500U, 500M, and 500D. The amount of compression will affect each other.

  According to such a configuration, the advance / retreat amount of the drive shaft 210, the spring constant / free length of each compression coil spring 500U, 500M, 500D and the fixed contact 110U (111U and 112U in FIG. 3), 110M (111M and 112M) , 110D (111D and 112D) and movable contacts 120U, 120M, and 120D can be freely combined to form a relay that opens and closes three contact pairs simultaneously, and a relay that opens and closes each contact pair with a time difference be able to. In particular, according to the second embodiment, overcompression of some compression coil springs 500U and 500M can be prevented. For example, even if the drive shaft 210 is moved greatly upward, each compression coil spring 500U, 500M urges the movable contacts 120M, 120D that abut on the lower end side thereof in a direction to push down. However, the compression amount of the compression coil spring is reduced, and over-compression of the compression coil springs 500U and 500M can be prevented.

  In this example, when a conductive material such as a metal is used as the compression coil springs 500U and 500M, a ceramic insulating washer (not shown) is provided between the ends of the compression coil springs 500U and 500M and the movable contacts 120U, 120M, and 120D. )) Is effective. For example, each movable contact 120U, 120M is interposed between the lower end of the upper compression coil spring 500U and the upper surface of the intermediate movable contact 120M and an insulating washer between the lower end of the intermediate compression coil spring 500M and the upper surface of the lower movable contact 120D. , 120D insulation can be secured. Of course, insulating washers may be arranged on the upper and lower ends of all the compression coil springs 500U, 500M, 500D.

  Except for the method of supporting the movable contact described above, the fixed contact, the material, shape and arrangement of the movable contact, the configuration of the solenoid itself, etc. are all the same as in the first embodiment.

<Example 3: Case structure>
Next, a relay of the present invention in which a plurality of contact pairs 100U, 100M, and 100D are housed in a case 600 will be described with reference to FIGS. This relay has a configuration in which a plurality of contact pairs 100U, 100M, and 100D having a configuration similar to that of the first embodiment are housed in the case 600, and the solenoid 200 is exposed outside the case 600.

  The case 600 is a plastic rectangular parallelepiped container, in which three spaces are formed in the vertical direction, fixed contacts 110U (111U and 112U in FIG. 4), 110M (111M and 112M) in each space, A contact pair consisting of 110D (111D and 112D) and movable contacts 120U, 120M, 120D is housed. A solenoid drive shaft 210 is disposed in the center of the case 600.

  The drive shaft 210 holds a total of three movable contacts 120U, 120M, and 120D using four flange portions (omitted in FIG. 4) and three compression coil springs (omitted in FIG. 4) as in the first embodiment. ing. Here, the disk-shaped metal plate of the same size is used for all the movable contacts 120U, 120M, and 120D. On the other hand, fixed contacts including input contacts 111U, 111M, 111D and output contacts 112U, 112M, 112D are arranged at positions opposite to the movable contacts 120U, 120M, 120D. These input contacts and output contacts are both formed of a thin metal block body, and are held so as to be bridged between the front and back surfaces of the case 600. In this example, the distance between the input contact and the movable contact is the same for each contact pair. A part of each fixed contact is exposed from the case back surface 620, and a lead (not shown) can be connected to the exposed portion.

  Also, the gap between the upper, middle, and lower input contacts 111U, 111M, and 111D and the movable contacts 120U, 120M, and 120D facing the input contacts 111U, 111M, and 111D, and the upper, middle, and lower output contacts 112U, A pair of magnets 700 is fixed so as to sandwich the gap between the movable contacts 120U, 120M, and 120D facing the output contacts 112U, 112M, and 112D from both sides. That is, a pair of magnets 700 are arranged for each gap, and a magnetic field can be formed in a direction orthogonal to the gap. Therefore, when the movable contacts 120U, 120M, and 120D are opened from the fixed contacts 110U, 110M, and 110D, the generated arc is distorted by the magnetic field and stretched, so that the interruption can be performed in a shorter time.

  These magnets 700 are fitted in a magnet storage portion 630 formed in the case. The back surface 620 of the case is configured to be detachable from the case body 610. With the case back surface 620 removed from the body 610, the magnet 700 and the fixed contacts 110U, 110M, and 110D are fitted, and then the back surface 620 is attached to the case body. Fix to 610. The back surface 620 and the case body 610 may be fixed with screws (not shown).

  On the other hand, the solenoid 200 has a configuration similar to that shown in FIG. 2, and a rectangular plate spacer 800 having a larger area than the upper surface of the main body is fixed to the upper portion of the main body, and the case 600 is fixed on the spacer 800. ing. The case 600 and the spacer 800 are integrated by a screw 900 that penetrates the lower portion of the case 600 and the spacer 800. That is, the case 600 and the solenoid 200 are integrated with each other by screwing the drive shaft 210 in the advancing and retracting direction. Therefore, even if the relay is repeatedly opened and closed, the case 600 does not deviate from the solenoid 200. As a result, variation in distance between the contacts can be suppressed, a stable contact state of the contacts can be maintained, and the contacts can be reliably brought into a non-contact state. Further, since the solenoid 200 is exposed to the outside of the case 600, it is not necessary to cover the solenoid 200 itself with the case, and the relay can be reduced in size.

  In the relay of this example, since each contact pair 100U, 100M, and 100D is housed in the case 600, foreign matter or the like is interposed between the fixed contacts 110U, 110M, and 110D and the movable contacts 120U, 120M, and 120D. Therefore, a highly reliable relay can be obtained.

  In the above example, a magnet is arranged for each gap between the fixed contacts 110U, 110M, and 110D and the movable contacts 120U, 120M, and 120D. However, a magnetic field is formed by arranging magnets common to the three contact pairs. May be. According to this configuration, the number of magnets 700 can be reduced.

  The relay of the present invention is desired to be used in a field where direct current interruption is required, particularly in a field where high voltage direct current interruption is required in a short space. For example, it is expected to be used in electric vehicles and hybrid vehicles.

In the schematic block diagram of the relay of Example 1, (A) shows the time of opening operation, (B) shows the time of closing operation. It is a schematic cross section of the solenoid used for this invention relay. In the schematic block diagram of the relay of Example 2, (A) shows the time of opening operation, (B) shows the time of closing operation. 6 is a schematic longitudinal sectional view of a relay of Example 3. FIG. 6 is a schematic cross-sectional view of a relay of Example 3. FIG. It is a schematic circuit diagram of the power supply circuit of a hybrid vehicle.

Explanation of symbols

100U, 100M, 100D contact pair
111U, 111M, 111D Input contact (fixed contact) 112U, 112M, 112D Output contact (fixed contact)
120U, 120M, 120D movable contact
200 Solenoid 210 Drive shaft 220 Main body 230 Compression coil spring
300U, 300M, 300D 300B Flange member 310U, 310M, 310D, 310B Pipe section
320U, 320M, 320D, 320B collar
400U, 400M, 400D compression coil spring
500U, 500M, 500D compression coil spring
600 Case 610 Case body 620 Case back 630 Magnet compartment
700 Magnet 800 Spacer 900 Screw
10 Main battery 20 Inverter 30 Motor
41 Precharge relay section 42 Positive main relay section
43 Negative main relay
50 capacitors 60 resistors

Claims (10)

A plurality of openable and closable contact pairs, one of which is a fixed contact and the other is a movable contact;
A single drive mechanism that opens and closes each contact pair;
Each of the contact pairs is arranged in the drive direction of the drive mechanism.   2. The DC relay according to claim 1, wherein the gaps when the contact pairs are opened are all the same.   The DC relay according to claim 1, wherein a gap when any one of the contact pairs is opened is different from a gap when another contact pair is opened.   2. The DC relay according to claim 1, further comprising a first elastic member that urges each movable contact toward the opposed fixed contact but does not urge adjacent movable contacts.   2. The DC relay according to claim 1, further comprising a second elastic member that urges each movable contact toward the opposite fixed contact and urges adjacent movable contacts away from each other. A solenoid whose drive mechanism has a drive shaft,
2. The DC relay according to claim 1, wherein the solenoid has an elastic material for a drive shaft for biasing the drive shaft in a direction in which each contact pair opens.   The DC relay according to claim 1, further comprising a magnet for distorting an arc generated between the fixed contact and the movable contact.   The DC relay according to claim 1, further comprising a case that houses a plurality of contact pairs.   The DC relay according to claim 8, wherein the drive mechanism and the case are coupled to each other in the drive direction of the drive mechanism by screws.   The DC relay according to claim 8, wherein the drive mechanism is exposed to the outside of the case.

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