JP2015170531A - electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay capable of improving the heat dissipation efficiency when the power is supplied to an exciting coil.SOLUTION: An electromagnet unit 2 moves a movable element 22 by attracting the movable element 22 to a stator 23 when a magnetic flux generated by an exciting coil 21 is applied to a yoke 24 which is disposed enclosing the exciting coil 21. A contact unit 3 is arranged to switch between a close state in which a movable contact 32 comes into contact with a fixed contact 31 and an open state in which the movable contact 32 is separated from the fixed contact 31 by when the movable contact 32 is moved accompanying the movement of the movable element 22. A case 4 stores at least the electromagnet unit 2. An intervention member 5 which has the thermal conductivity higher than the air is disposed in a space 6 between the yoke 24 and the case 4.

Description

  The present invention generally relates to an electromagnetic relay, and more particularly to an electromagnetic relay including an electromagnet device and a contact device.

  2. Description of the Related Art Conventionally, as an electromagnetic relay, an electromagnetic relay (electromagnetic switching device) having a configuration including an electromagnet device and a contact device in a case is known (see, for example, Patent Document 1).

  The electromagnetic relay described in Patent Document 1 houses an electromagnet device and a contact device in a case made of synthetic resin. This electromagnetic relay attracts the mover (movable iron core) to the stator (fixed iron core) in response to energization of the excitation coil (excitation winding) of the electromagnet device, and contacts in conjunction with the movement of the mover It is comprised so that the contact of an apparatus may be opened and closed.

  In Patent Document 1, a support member that supports an electromagnet device is provided by sandwiching an exciting coil in a part of the inner peripheral surface of the case, and the electromagnet device is supported in the case. The exciting coil has a plurality of wires wound around it, and there are many regions separated by the wires in the exciting coil. Therefore, vibration generated when the mover collides with the stator in the electromagnet device is difficult to be transmitted to the support member, and as a result, is difficult to be transmitted to the case.

  Furthermore, Patent Document 1 also describes that heat generated in the exciting coil when the exciting coil is energized is dissipated from the case via the support member, and the temperature rise of the exciting coil can be suppressed.

JP 2007-294262 A

  However, depending on the environment in which the electromagnetic relay is used, the magnitude of the current flowing through the exciting coil, the number of turns of the exciting coil, etc., the configuration described in Patent Document 1 may result in insufficient heat dissipation when the exciting coil is energized. There is sex.

  The present invention has been made in view of the above-described reasons, and an object thereof is to provide an electromagnetic relay capable of improving the heat dissipation efficiency when an exciting coil is energized.

  The electromagnetic relay of the present invention has an excitation coil, a mover, a stator, and a yoke, and passes the magnetic flux generated in the excitation coil through the yoke arranged so as to surround the excitation coil. An electromagnet device that attracts the mover to a child and moves the mover; a fixed contact and a movable contact; and the movable contact moves as the mover moves so that the movable contact becomes A contact device that switches between a closed state in contact with a fixed contact and an open state in which the movable contact is separated from the fixed contact; a case that houses at least the electromagnet device; and a yoke that has a higher thermal conductivity than air and the yoke. And an interposition member disposed in a gap with the case.

  In this electromagnetic relay, it is desirable that the interposition member is made of an elastic material.

  In this electromagnetic relay, it is preferable that a part of the case including a region facing the interposed member is made of a metal material.

  In this electromagnetic relay, it is preferable that the case is entirely made of a metal material.

  In this electromagnetic relay, it is preferable that the case has a leaf spring made of a metal material in a region facing the interposed member, and the leaf spring is pressed against the interposed member.

  In this electromagnetic relay, it is preferable that the case has a convex portion at a part of an inner peripheral surface, and the interposition member is disposed between the convex portion and the yoke.

  The present invention includes at least a case that houses the electromagnet device and an interposition member that has a higher thermal conductivity than air and is disposed in the gap between the yoke and the case, so that the heat dissipation efficiency when the exciting coil is energized can be improved. There is an advantage.

It is a schematic sectional drawing of the electromagnetic relay which concerns on Embodiment 1. FIG. It is a side view of the electromagnet apparatus of the electromagnetic relay which concerns on Embodiment 1. FIG. 6 is a schematic cross-sectional view of a main part of an electromagnetic relay according to a modification of the first embodiment. FIG. 6 is a schematic cross-sectional view of a main part of an electromagnetic relay according to a second embodiment. FIG. It is a schematic sectional drawing of the principal part which shows the other example of the electromagnetic relay which concerns on Embodiment 2. FIG. It is a schematic sectional drawing of the principal part which shows the other example of the electromagnetic relay which concerns on Embodiment 2. FIG. 6 is a schematic cross-sectional view of a main part of an electromagnetic relay according to a first modified example of Embodiment 2. FIG. It is a schematic sectional drawing of the principal part which shows the other example of the electromagnetic relay which concerns on the 1st modification of Embodiment 2. FIG. 10 is a schematic cross-sectional view of a main part of an electromagnetic relay according to a second modification of the second embodiment. It is a schematic sectional drawing of the principal part of the electromagnetic relay which concerns on a 1st reference example. It is a schematic sectional drawing of the principal part which shows the other example of the electromagnetic relay which concerns on a 1st reference example. It is a schematic sectional drawing of the principal part of the electromagnetic relay which concerns on a 2nd reference example.

(Embodiment 1)
The electromagnetic relay 1 of this embodiment is provided with the electromagnet apparatus 2, the contact apparatus 3, the case 4, and the interposition member 5, as shown in FIG.

  The electromagnet device 2 includes an exciting coil 21, a mover 22, a stator 23, and a yoke 24. The electromagnet device 2 is configured to move the mover 22 by attracting the mover 22 to the stator 23 by passing the magnetic flux generated by the excitation coil 21 through the yoke 24 arranged so as to surround the excitation coil 21. Has been.

  The contact device 3 has a fixed contact 31 and a movable contact 32. The contact device 3 has a closed state in which the movable contact 32 comes into contact with the fixed contact 31 and an open state in which the movable contact 32 is separated from the fixed contact 31 by the movement of the movable contact 32 as the mover 22 moves. It is comprised so that it may switch.

  The case 4 houses at least the electromagnet device 2. In the example of FIG. 1, the case 4 is configured to accommodate both the electromagnet device 2 and the contact device 3.

  The interposition member 5 has a higher thermal conductivity than air, and is disposed in the gap 6 between the yoke 24 and the case 4.

  Hereinafter, the electromagnetic relay 1 of this embodiment will be described in detail. However, the electromagnetic relay 1 described below is only an example of the present invention, and the present invention is not limited to the following embodiment, and the technical idea according to the present invention is not limited to this embodiment. As long as it does not deviate from the above, various changes can be made according to the design and the like.

  In the present embodiment, as an example, the electromagnetic relay 1 is mounted on an electric vehicle (EV), and is connected so that the contact device 3 is interposed on a DC power supply path from a battery for traveling to a load (for example, an inverter). Will be described. The excitation coil 21 of the electromagnetic relay 1 is connected to an excitation power source via a switching element that is switched on and off in accordance with a control signal from an ECU (electronic control unit) of the electric vehicle. Thereby, as for the electromagnetic relay 1, the contact apparatus 3 opens and closes according to the control signal from ECU, and can switch the supply state of the direct-current power from the battery for driving | running | working to load.

  In the present embodiment, the contact device 3 includes a pair of fixed contacts 31, a pair of movable contacts 32, a pair of terminal blocks 11 and 12 that support each fixed contact 31, and a movable contact that supports both movable contacts 32. 13 and a contact pressure spring 14 for securing the contact pressure.

  Although the configuration of the contact device 3 will be described later in detail, the contact device 3 includes a pair of fixed contacts 31 and a movable contact 32 so that the contact between the pair of terminal blocks 11 and 12 is movable while the contact device 3 is closed. Short circuit through the child 13. Therefore, the contact device 3 is electrically connected between the battery and the load so that the DC power from the traveling battery is supplied to the load through the pair of terminal blocks 11 and 12 and the movable contact 13. The

<Basic configuration>
As shown in FIG. 1, the electromagnetic relay 1 according to the present embodiment includes a shaft 15, a contact container 16, a coupling body 17, and a permanent magnet 18 in addition to the electromagnet device 2, the contact device 3, and the case 4 described above. And.

  The electromagnet device 2 includes a coil bobbin 25, a return spring 26, and a cylindrical body 27 in addition to the exciting coil 21, the mover 22, the stator 23, and the yoke 24.

  The coil bobbin 25 is made of, for example, a synthetic resin, is formed in a cylindrical shape, and has a pair of plate-like portions 251 and 252 that are parallel to each other at both ends in the central axis direction. In the coil bobbin 25, an electric wire constituting the exciting coil 21 is wound between a pair of plate-like portions 251 and 252.

  The yoke 24, together with the stator 23 and the mover 22, forms a magnetic circuit through which the magnetic flux generated in the exciting coil 21 passes when the exciting coil 21 is energized. Therefore, all of the yoke 24, the stator 23, and the needle | mover 22 are formed from the magnetic material.

  In the present embodiment, the yoke 24 includes an upper plate 241 and a lower plate 242 that are provided on both sides of the coil bobbin 25 in the central axis direction of the coil bobbin 25 (the same as the central axis direction of the exciting coil 21) and are parallel to each other. Yes.

  In the following description, the central axis direction of the excitation coil 21 is the vertical direction, and the upper plate 241 side is the upper side and the lower plate 242 side is the lower side when viewed from the excitation coil 21. Further, in the plane orthogonal to the vertical direction, the direction in which the pair of terminal blocks 11 and 12 of the contact device 3 are arranged is the left-right direction, and the first terminal block 11 side is the left side and the second side when viewed from the center in the left-right direction The terminal block 12 side will be described on the right side. However, these directions are not intended to limit the usage pattern of the electromagnetic relay 1. In addition, the names “upper plate” and “lower plate” are not intended to limit the usage of the electromagnetic relay 1.

  The yoke 24 further includes a side plate 243 that connects the peripheral portions of the upper plate 241 and the lower plate 242, and a bush 244 formed in a cylindrical shape that protrudes upward from the central portion of the lower plate 242. ing. Here, the upper plate 241 and the lower plate 242 are each formed in a rectangular plate shape. A pair of side plates 243 are provided so as to connect a pair of sides facing each other on the lower surface of the upper plate 241 and a pair of sides facing each other on the upper surface of the lower plate 242. In the present embodiment, the pair of side plates 243 are disposed on both the left and right sides of the exciting coil 21.

  The pair of side plates 243 and the lower plate 242 are formed integrally from a single plate in the example of FIG. 1, but are not limited to this example, and may be formed of different plates. In addition, a holding hole (not shown) is formed in the central portion of the lower plate 242, and the lower end of the bush 244 is fitted in the holding hole of the lower plate 242, but this is not restrictive. The lower plate 242 and the bush 244 may be formed from a single plate.

  The exciting coil 21 is disposed in a space surrounded by the upper plate 241, the lower plate 242, and the pair of side plates 243, and the bush 244, the stator 23, and the mover 22 are disposed inside thereof. That is, the upper plate 241 is positioned above the excitation coil 21, the lower plate 242 is positioned below the excitation coil 21, and the pair of side plates 243 are positioned on both the left and right sides of the excitation coil 21. 21 is arranged so as to be surrounded by the yoke 24. Both ends of the electric wire constituting the exciting coil 21 are connected to a pair of input terminals (not shown).

  The stator 23 is a fixed iron core formed in a cylindrical shape protruding downward from the center portion of the upper plate 241, and an upper end portion thereof is fixed to the yoke (upper plate 241) 24. Specifically, a fitting hole 245 is formed in the central portion of the upper plate 241, and the upper end portion of the stator 23 is fitted in the fitting hole 245. The outer diameter of the stator 23 is formed smaller than the inner diameter of the bush 244. Further, a gap (gap) is secured in the vertical direction between the lower end surface of the stator 23 and the upper end surface of the bush 244.

  The mover 22 is a movable iron core formed in a columnar shape, and is arranged below the stator 23 so that the upper end surface thereof faces the lower end surface of the stator 23. The outer diameter of the mover 22 is formed to be the same as the outer diameter of the stator 23 (that is, smaller than the inner diameter of the bush 244), and the mover 22 extends vertically inside the bush 244 along the inner peripheral surface of the bush 244. Moving. In other words, the mover 22 is movable between a first position where the upper end surface is in contact with the lower end surface of the stator 23 and a second position where the upper end surface is separated from the lower end surface of the stator 23. It is configured.

  The return spring 26 is a coil spring that is disposed inside the stator 23 and biases the mover 22 downward (second position). Specifically, the stator 23 is formed so that its inner diameter is larger than the upper end portion at a portion other than the upper end portion of the stator 23. The inner side of the stator 23 other than the upper end portion thus formed constitutes a storage space 231 for storing the return spring 26. As a result, the return spring 26 is compressed and accommodated in the storage space 231 when the mover 22 is attracted by the stator 23 and moved from the second position to the first position. 23 can be contacted.

  The cylindrical body 27 is formed in a bottomed cylindrical shape whose upper surface is opened from a nonmagnetic material, and houses the stator 23 and the movable element 22. The cylindrical body 27 has an upper end portion (opening peripheral portion) fixed to the upper plate 241 and a lower portion fitted inside the bush 244. The depth dimension of the cylindrical body 27 is set so that the distance from the bottom surface to the lower end surface of the stator 23 is sufficiently larger than the vertical dimension of the movable element 22. The cylindrical body 27 restricts the moving direction of the mover 22 in the vertical direction.

  The electromagnet device 2 is configured such that the excitation coil 21, the coil bobbin 25, the bush 244, the stator 23, and the mover 22 all have a central axis on the same straight line along the vertical direction.

  With the above-described configuration, when the magnet 22 is not energized to the exciting coil 21 (when it is not energized), no magnetic attractive force is generated between the mover 22 and the stator 23. 2 position. On the other hand, when the exciting coil 21 is energized, the movable element 22 is attracted upward against the spring force of the return spring 26 and moves to the first position because a magnetic attractive force is generated between the movable element 22 and the stator 23. To do.

  In other words, when the excitation coil 21 is energized, the electromagnet apparatus 2 generates magnetic flux in the magnetic circuit formed by the yoke 24, the stator 23, and the mover 22, so that the magnetic resistance of the magnetic circuit is reduced. The mover 22 is moved so as to be smaller. Specifically, the electromagnet device 2 is configured so that when the exciting coil 21 is energized, the mover 22 fills the gap between the lower end surface of the stator 23 and the upper end surface of the bush 244 in the magnetic circuit with the mover 22. Is moved from the second position to the first position.

  In short, the electromagnet device 2 attracts the mover 22 to the stator 23 by the magnetic flux generated in the excitation coil 21 when the excitation coil 21 is energized, and moves the mover 22 from the second position to the first position. And while energization to the exciting coil 21 continues, the electromagnet device 2 keeps generating the attractive force between the stator 23 and the mover 22, so that the mover 22 is held at the first position. When the energization of the exciting coil 21 is stopped, the electromagnet device 2 moves the mover 22 from the first position to the second position by the spring force of the return spring 26. As described above, the electromagnet device 2 controls the attractive force acting on the movable element 22 by switching the energization state of the exciting coil 21 and moves the movable element 22 in the vertical direction, thereby opening and closing the contact device 3. A driving force for switching between states is generated.

  The pair of terminal blocks 11 and 12 in the contact device 3 are arranged so as to be aligned in the left-right direction above the electromagnet device 2, and each is formed in a columnar shape having a circular cross section perpendicular to the vertical direction. . The pair of terminal blocks 11 and 12 are fixed in positional relationship with the yoke 24 and the stator 23 of the electromagnet device 2.

  Specifically, the pair of terminal blocks 11 and 12 are fixed to the contact container 16 joined to the yoke 24. The contact container 16 is formed in a box shape having an open bottom surface, and houses the fixed contact 31 and the movable contact 32 between the upper plate 241 and the contact container 16. The contact container 16 is made of a heat-resistant material such as ceramic, for example, and the opening peripheral portion thereof is joined to the peripheral portion of the upper surface of the upper plate 241 via the connecting body 17. The pair of terminal blocks 11 and 12 are joined to the contact container 16 in a form inserted through a round hole 162 formed in the bottom plate 161 of the contact container 16.

  The contact container 16, the connecting body 17, the upper plate 241, and the cylindrical body 27 desirably form an airtight container that forms an airtight space therein. In this case, the gastight container mainly includes hydrogen. It is desirable that arc gas is enclosed. As a result, even when an arc is generated when the fixed contact 31 and the movable contact 32 housed in the hermetic container are opened, the arc is rapidly cooled by the arc extinguishing gas and can be extinguished quickly. However, the fixed contact 31 and the movable contact 32 are not limited to the structure accommodated in the airtight container.

  A pair of permanent magnets 18 are provided on the left and right sides of the contact container 16. The pair of permanent magnets 18 applies a magnetic field to the internal space of the contact container 16 and extends the arc generated when the fixed contact 31 and the movable contact 32 are opened, thereby enabling quicker extinction.

  The pair of terminal blocks 11 and 12 are made of a conductive material, and a fixed contact 31 is provided at each lower end portion. Each of the pair of terminal blocks 11 and 12 is formed such that the outer diameter thereof is larger at the upper end portion than the portion other than the upper end portion of each terminal block 11 and 12. Of the pair of terminal blocks 11 and 12, the first terminal block 11 is connected to one of the battery and the load, and the second terminal block 12 is connected to the other.

  The movable contact 13 is formed in a rectangular plate shape from a conductive material, and the pair of terminal blocks 11 so that both ends in the longitudinal direction (left and right direction) are opposed to the lower ends of the pair of terminal blocks 11 and 12. , 12 are arranged below. A movable contact 32 is provided at each portion of the movable contact 13 that faces the fixed contact 31 provided on each of the terminal blocks 11 and 12.

  The movable contact 13 is driven in the vertical direction by the electromagnet device 2. As a result, each movable contact 32 provided on the movable contact 13 moves between a closed position in contact with the corresponding fixed contact 31 and an open position away from the fixed contact 31. When the movable contact 32 is in the closed position, that is, when the contact device 3 is closed, the first terminal block 11 and the second terminal block 12 are short-circuited via the movable contact 13. Therefore, in a state where the contact device 3 is closed, DC power is supplied from the traveling battery to the load.

  The movable contact 32 may be configured integrally with the movable contact 13 by, for example, driving a part of the movable contact 13, or may be a separate member from the movable contact 13. It may be fixed. Similarly, the fixed contact 31 may be configured integrally with the terminal blocks 11 and 12, or may be formed of a member different from the terminal blocks 11 and 12 and fixed to the terminal blocks 11 and 12.

  The contact pressure spring 14 is disposed between the stator 23 and the movable contact 13 and is a coil spring that biases the movable contact 13 upward. The spring force of the contact pressure spring 14 is set smaller than the spring force of the return spring 26.

  The shaft 15 is formed in a round bar shape extending in the vertical direction with a nonmagnetic material, and transmits the driving force generated by the electromagnet device 2 to the contact device 3 provided above the electromagnet device 2. The shaft 15 is formed with a flange 151 having a larger outer diameter at the upper end of the shaft 15 as compared with a portion other than the upper end of the shaft 15. A through hole 131 having a diameter smaller than the outer diameter of the shaft 15 is formed at the center of the movable contact 13, and the shaft 15 brings the flange 151 into contact with the periphery of the through hole 131 on the upper surface of the movable contact 13. In this way, the movable contact 13 is inserted into the through hole 131. Further, the shaft 15 passes through the inside of the contact pressure spring 14, the stator 23, and the return spring 26, and the lower end portion thereof is fixed to the movable element 22.

  Thereby, the driving force generated in the electromagnet device 2 is transmitted to the movable contact 13 by the shaft 15, and the movable contact 13 moves in the vertical direction as the movable element 22 moves in the vertical direction.

  The case 4 is formed in a box shape (cuboid shape) using an electrically insulating material such as a synthetic resin. In this embodiment, the case 4 houses both the electromagnet device 2 and the contact device 3 as an inner unit block, and the pair of terminal blocks 11 and 12 are also arranged in the case 4. However, the case 4 only needs to accommodate at least the electromagnet device 2. For example, the pair of terminal blocks 11 and 12 may be exposed from the case 4. Further, the case 4 may house only the electromagnet device 2, and the contact device 3 may be disposed outside the case 4.

  As shown in FIG. 1, the case 4 has an upper wall 41 and a lower wall 42 that are provided on both sides of the inner unit block (the electromagnet device 2 and the contact device 3) in the vertical direction and are parallel to each other. Furthermore, the case 4 has a pair of side walls 43 provided on both sides of the inner unit block in the left-right direction and parallel to each other. Furthermore, the case 4 has a front wall (not shown) and a back wall (not shown) which are provided on both sides of the inner unit block in the depth direction (a direction orthogonal to the paper surface of FIG. 1) and are parallel to each other. ing.

  Here, the case 4 can be divided into two or more divided parts, and is configured by combining these two or more divided parts so that the electromagnet device 2 and the contact device 3 are accommodated therein. That is, when assembling the electromagnetic relay 1, the inner unit block (the electromagnet device 2 and the contact device 3) housed in the case 4 is assembled first, and two or more divided parts are put on the inner unit block. Is assembled.

<Operation>
Next, the operation of the electromagnetic relay 1 having the above-described configuration will be briefly described with reference to FIG.

  When the exciting coil 21 is not energized, as shown in FIG. 1, the mover 22 of the electromagnet device 2 is located at the second position, so that the shaft 15 is pulled down by the electromagnet device 2. At this time, the shaft 15 pushes the movable contact 13 downward by the flange 151 provided at the upper end thereof. Therefore, the movable contact 13 is restricted from moving upward by the flange portion 151 of the shaft 15, and positions the pair of movable contacts 32 at an open position away from the pair of fixed contacts 31. In this state, since the contact device 3 is in an open state, the pair of terminal blocks 11 and 12 are not conductive.

  On the other hand, when the excitation coil 21 is energized, the mover 22 of the electromagnet device 2 is attracted by the stator 23 and positioned at the first position, so that the shaft 15 is pushed upward by the electromagnet device 2. At this time, the shaft 15 moves the flange 151 provided at the upper end thereof upward. Therefore, the movable contact 13 is released from the upward movement restriction by the flange 151, and is pushed upward by the spring force of the contact pressure spring 14 to close the pair of movable contacts 32 to the pair of fixed contacts 31. To be located.

  At this time, the shaft 15 is set with an appropriate overtravel so that the movable contact 32 is further pushed up after contacting the fixed contact 31. Since the movable contact 13 is biased upward by the contact pressure spring 14, a contact pressure (contact pressure) between the pair of movable contacts 32 and the pair of fixed contacts 31 can be ensured. In this state, since the contact device 3 is in a closed state, the pair of terminal blocks 11 and 12 are electrically connected.

<Feature configuration>
Next, the interposed member 5 which is the characteristic of the electromagnetic relay 1 which concerns on this embodiment is demonstrated.

  The interposition member 5 is disposed in the gap 6 between the yoke 24 and the case 4. That is, the yoke 24 arranged so as to surround the exciting coil 21 forms an outer shell of the electromagnet device 2. Although the electromagnet device 2 is housed in the case 4, the inner size of the case 4 is set larger than the outer size of the electromagnet device 2 so that the electromagnet device 2 is surely contained in the case 4. Therefore, a gap 6 is formed between the yoke 24 that forms the outer case of the case 4 and the inner peripheral surface of the case 4. Therefore, the interposition member 5 is disposed between the yoke 24 and the case 4 so as to fill the gap 6 between the yoke 24 and the case 4 generated in this way.

  In the present embodiment, the interposition member 5 is provided in the gap 6 between the lower plate 242 of the yoke 24 and the lower wall 42 of the case 4 and the gap 6 between each side plate 243 of the yoke 24 and each side wall 43 of the case 4. Limited. Further, the interposition member 5 is provided only in a region corresponding to the exciting coil 21. That is, in the gap 6 between the lower plate 242 of the yoke 24 and the lower wall 42 of the case 4, the interposition member 5 is within a range that fits inside the outer diameter of the exciting coil 21 and corresponds to the cylinder 27. It is limited to the area excluding the part to be. That is, in the gap 6 between the side plate 243 of the yoke 24 and the side wall 43 of the case 4, the interposition member 5 is limited to a region that is within the range from the upper end to the lower end of the exciting coil 21.

  In other words, the interposition member 5 is a gap between the yoke (lower plate 242) 24 and the case (lower wall 42) 4 in the central axis direction (vertical direction) of the exciting coil 21 that is the moving direction of the mover 22 (hereinafter referred to as “moving element 22”). , Also referred to as “longitudinal gap”) 6. Furthermore, the interposition member 5 has a gap (hereinafter referred to as a “lateral gap”) between the yoke (side plate 243) 24 and the case (side wall 43) 4 in one direction (left-right direction) orthogonal to the central axis direction of the exciting coil 21. 6).

  Here, the interposition member 5 is formed using a material having a higher thermal conductivity than air. Therefore, in the electromagnetic relay 1, heat is easily transmitted from the yoke 24 to the case 4 due to the interposition member 5 being interposed, as compared with a configuration without the interposition member 5.

  In particular, in this embodiment, the interposition member 5 is formed using an elastic material such as an elastomer, specifically, silicone rubber, butyl rubber, nitrile rubber or the like as an example. The elastomer here may be either a thermosetting elastomer or a thermoplastic elastomer. That is, since the interposition member 5 has elasticity, the interposition member 5 can be brought into close contact with the yoke 24 and the case 4.

  The close contact here does not only mean a state in which no gap is completely generated, but at least a state in which a reaction force acts on the interposition member 5, that is, the interposition member 5 is against the yoke 24 and the case 4. It includes a state where it is pressed. Therefore, for example, another member such as an insulating film may be interposed between the interposed member 5 and the yoke 24 or the case 4. However, the interposition member 5 is preferably in contact with the yoke 24 and the case 4. The contact here does not mean only a state where the entire surface of the interposition member 5 is in contact, but includes a state where only a part of the interposition member 5 is locally in contact with the yoke 24 and the case 4. .

  Moreover, in this embodiment, the electromagnetic relay 1 uses the member previously shape | molded by the sheet form as the interposition member 5. FIG. However, the interposition member 5 is not limited to a solid material formed into a sheet shape, and may be a member having viscosity or fluidity such as grease or potting resin.

  Furthermore, the interposition member 5 may be configured by combining two or more members instead of a single member. For example, when the interposition member 5 is in the form of a sheet as in the present embodiment, the interposition member 5 may have a multi-layer laminated structure made of different materials.

  In addition, it is not an essential structure that the interposed member 5 consists of a material which has elasticity, and the interposed member 5 may be formed with the material which does not have elasticity. In addition, it is not essential that the interposed member 5 is provided in both the vertical gap 6 and the horizontal gap 6, and the interposed member 5 is provided in at least one of the vertical gap 6 and the horizontal gap 6. It only has to be done. That is, the interposition member 5 may be disposed only in the vertical gap 6 (the gap between the lower plate 242 and the lower wall 42), or the intervening member 5 may be disposed in the horizontal direction (the gap between the side plate 243 and the side wall 43). ) May be arranged only in 6. On the contrary, the interposition member 5 may be provided so as to fill all the gaps 6 by filling with a resin material or the like.

  Moreover, the electromagnetic relay 1 of this embodiment has the surface area of the yoke 24 expanded compared with the conventional general electromagnetic relay. Specifically, as shown by a solid line in FIG. 2, the electromagnetic relay 1 of the present embodiment has a width of the side plate 243 of the yoke 24 compared to a general electromagnetic relay (shown by a two-dot chain line in FIG. 2). It has been expanded. FIG. 2 is a right side view of the electromagnet device 2 with the case 4 removed.

<Effect>
According to the electromagnetic relay 1 of the present embodiment described above, the interposition member 5 having a thermal conductivity higher than that of the air is disposed in the gap 6 between the yoke 24 and the case 4. Heat is easily transmitted. Therefore, the electromagnetic relay 1 can release the heat (Joule heat) generated in the exciting coil 21 when the exciting coil 21 is energized from the yoke 24 to the case 4 through the interposing member 5 and dissipate the heat from the case 4. Here, since the yoke 24 is disposed so as to surround the exciting coil 21, the electromagnetic relay 1 can collect the heat generated in the exciting coil 21 in the yoke 24 and efficiently release it to the case 4. .

  Therefore, the electromagnetic relay 1 according to the present embodiment can further improve the heat dissipation efficiency when the exciting coil 21 is energized, as compared with the conventional electromagnetic relay. As a result, the temperature increase of the electromagnetic relay 1 is suppressed, and an increase in resistivity of the exciting coil 21 can be suppressed. Therefore, when the same degree of magnetic flux is generated, the number of turns of the exciting coil 21 is reduced. Thus, the electromagnet device 2 can be reduced in size. In addition, the electromagnetic relay 1 can be expected to have an effect that power consumption in the exciting coil 21 is suppressed, and cost reduction can be achieved by lowering the heat resistance grade of the electric wire used for the exciting coil 21.

  Furthermore, in the electromagnetic relay 1 according to the present embodiment, the gap 6 between the yoke 24 and the case 4 constituting the outline of the electromagnet device 2 is filled with the interposition member 5, so that the gap between the excitation coil 21 and the case 4 is interposed. Compared with the case of filling with a member, the necessary volume of the interposed member 5 is reduced. Thereby, it is possible to keep the material cost of the interposed member 5 as low as possible while using the interposed member 5.

  Moreover, since the interposition member 5 is provided in both the vertical gap (gap between the lower plate 242 and the lower wall 42) 6 and the horizontal gap (gap between the side plate 243 and the side wall 43) 6, Heat can be efficiently transferred from the yoke 24 to the case 4.

  Moreover, it is preferable that the interposed member 5 consists of a material which has elasticity like this embodiment. According to this configuration, the interposition member 5 can be in close contact with the yoke 24 and the case 4, heat can be easily transferred from the yoke 24 to the case 4, and the heat dissipation efficiency can be further improved. it can. Moreover, the electromagnetic relay 1 suppresses the vibration of the case 4 and the noise due to the vibration because the vibration generated in the inner block (the electromagnet device 2 and the contact device 3) is absorbed by the interposition member 5 and hardly transmitted to the case 4. can do. Furthermore, rattling of the internal unit block in the case 4 can be suppressed.

  In particular, the intervening member 5 in the longitudinal gap (gap between the lower plate 242 and the lower wall 42) 6 is more movable than the intervening member 5 in the lateral gap (gap between the side plate 243 and the side wall 43) 6. It is easy to absorb the vibration generated when the motor collides with the stator 23. Therefore, the electromagnetic relay 1 of this embodiment can reduce the vibration transmitted from the inner unit block to the case 4 as compared with the configuration in which the interposition member 5 is provided only in the lateral gap 6.

  Moreover, since the surface area of the yoke 24 is expanded compared with the conventional general electromagnetic relay, the electromagnetic relay 1 of this embodiment is a part of the heat dissipation path 24 as shown in FIG. There is an advantage that the heat capacity can be increased. Furthermore, since the electromagnetic relay 1 can easily transfer heat from the yoke 24 to the case 4 through the interposition member 5 due to the expanded surface area, the heat dissipation efficiency can be further improved.

<Modification>
FIG. 3 shows a main part of the electromagnetic relay 1 according to a modification of the present embodiment.

  In this modified example, the case 4 has convex portions 421 and 431 on a part of the inner peripheral surface, and the interposition member 5 is disposed between the convex portions 421 and 431 and the yoke 24. Specifically, a convex portion 421 is formed on the lower wall 42 of the case 4 so as to protrude toward the lower plate 242 of the yoke 24, and the side wall 43 of the case 4 faces the side plate 243 of the yoke 24. A protruding portion 431 having a protruding shape is formed.

  The interposing member 5 in the vertical gap (gap between the lower plate 242 and the lower wall 42) 6 is disposed between the convex portion 421 and the lower plate 242. The interposition member 5 in the lateral gap (gap between the side plate 243 and the side wall 43) 6 is disposed between the convex portion 431 and the side plate 243.

  According to this configuration, since the gap 6 in which the interposition member 5 is disposed is narrower than the configuration without the convex portions 421 and 431, the thickness of the interposition member 5 can be reduced, and the interposition member 5 is used. In addition, the material cost of the interposition member 5 can be kept as low as possible.

  The shapes and ranges of the convex portions 421 and 431 and the interposition member 5 do not have to match. For example, the convex portion 421 protrudes from the interposition member 5, or conversely, the interposition member 5 protrudes from the convex portion 421. Or you may.

(Embodiment 2)
The electromagnetic relay 1 according to the present embodiment is different from the electromagnetic relay 1 of the first embodiment in that at least a part of the case 4 is made of a metal material. Hereinafter, the same configurations as those of the first embodiment are denoted by common reference numerals, and description thereof is omitted as appropriate.

  In the present embodiment, as shown in FIG. 4, for example, the case 4 is partially made of a metal material including a region facing the interposed member 5. In the example of FIG. 4, the region facing the interposition member 5 in the case 4 is a metal portion 44 made of a metal material, and the other region is made of synthetic resin. Note that the case 4 in which the metal portion and the synthetic resin portion are integrated in this way can be formed by well-known insert molding.

  For example, as shown in FIG. 5, the case 4 is a metal portion 44 made of a metal material only on the side of the interposition member 5 in the thickness direction, and the side opposite to the interposition member 5 is made of a synthetic resin. There may be. In the example of FIG. 5, the region facing the interposition member 5 in the side wall 43 of the case 4 is a two-layer structure in which the inside of the case 4 (on the interposition member 5 side) is metal (metal part 44) and the outside of the case 4 is synthetic resin. It is.

  Moreover, the case 4 may form the convex part 431 of the shape from which the metal part 44 protrudes toward the yoke 24 as shown, for example in FIG. That is, the example of FIG. 6 is an example in which a part of the case 4 including the region facing the interposition member 5 is used as the metal part 44 in the configuration of FIG. 3 described as a modification of the first embodiment.

  4 to 6, the side wall 43 of the case 4 is illustrated, but the region facing the interposition member 5 also on the lower wall 42 is made of a metal material. However, the present invention is not limited to this example, and the region facing the interposition member 5 may be made of a metal material in only one of the side wall 43 and the lower wall 42.

  In the present embodiment, it is only necessary that a part of the case 4 is a metal part 44 made of a metal material and the metal part 44 includes a region facing the interposition member 5. Therefore, the shape and the range of the metal part 44 and the interposition member 5 do not have to coincide with each other. For example, the metal part 44 protrudes from the interposition member 5, or conversely, the interposition member 5 protrudes from the metal part 44. May be.

  According to the configuration of the present embodiment described above, a part of the case 4 that is a part of the heat dissipation path is made of metal having a higher thermal conductivity than a synthetic resin or the like. It becomes easy to radiate heat, and the heat radiation efficiency can be further improved. Further, the electromagnetic relay 1 has an advantage that the heat capacity of the case 4 can be increased by making a part of the case 4 made of metal. Furthermore, since this electromagnetic relay 1 is made of only a part of the case 4 instead of the metal, the heat dissipation efficiency can be improved while ensuring the electrical insulation of the case 4.

<First Modification>
FIG. 7 shows a main part of the electromagnetic relay 1 according to the first modification of the present embodiment.

  In the first modification, the case 4 is entirely made of a metal material. In this case, electrical insulation of the case 4 is ensured by an appropriate method such as attaching an insulating film.

  According to this configuration, since the entire case 4 that is a part of the heat dissipation path is made of metal having a higher thermal conductivity than synthetic resin or the like, the electromagnetic relay 1 is easily radiated from the entire case 4, The heat dissipation efficiency can be further improved. Moreover, this electromagnetic relay 1 also has the advantage that the heat capacity of the case 4 can be significantly increased because the case 4 is entirely made of metal.

  Further, as shown in FIG. 8, the case 4 made entirely of a metal material has a convex portion 431 on a part of the inner peripheral surface, and the interposition member 5 is disposed between the convex portion 431 and the yoke 24. May be. That is, the example of FIG. 8 is an example in which the entire case 4 is made of metal in the configuration of FIG. 3 described as a modification of the first embodiment.

<Second Modification>
FIG. 9 shows a main part of the electromagnetic relay 1 according to the second modification of the present embodiment.

  In the second modification, the case 4 has a leaf spring 45 made of a metal material in a region facing the interposition member 5 as shown in FIG. The leaf spring 45 is pressed against the interposition member 5. Here, the leaf spring 45 is a flat spring formed from one thin metal plate. One end of the leaf spring 45 is fixed to the metal portion 44 of the case 4, and the other end is pressed against the interposition member 5. That is, the leaf spring 45 is compressed between the metal portion 44 and the interposition member 5 and is elastically deformed.

  According to this structure, since the part which contacts the interposition member 5 among the cases 4 is the metal leaf | plate spring 45, there exists an effect of the further improvement of thermal radiation efficiency and increase of a heat capacity similarly to the said embodiment. Further, due to the elastic force of the leaf spring 45, the interposition member 5 can be in close contact with the yoke 24 and the case (plate spring 45) 4, heat can be easily transferred from the yoke 24 to the case 4, and the heat dissipation efficiency. Can be further improved. Moreover, the electromagnetic relay 1 suppresses vibration of the case 4 because vibration generated in the inner unit block (the electromagnet device 2 and the contact device 3) is absorbed not only by the interposition member 5 but also by the leaf spring 45 and is not easily transmitted to the case 4. In addition, noise due to vibration can be suppressed. Furthermore, rattling of the internal unit block in the case 4 can be suppressed.

  The configuration of the second modification can be applied in combination with the configuration of the first modification. Furthermore, the first and second modifications can be applied in appropriate combination with the configurations described in the first and second embodiments.

  Other configurations and functions are the same as those of the first embodiment.

(Reference example)
Hereinafter, reference examples will be described with reference to FIGS. Hereinafter, the same configurations as those of the first embodiment or the second embodiment are denoted by common reference numerals, and the description thereof is omitted as appropriate.

<First Reference Example>
As shown in FIG. 10, in the electromagnetic relay 1 according to the first reference example, the interposition member 5 is disposed in the gap between the exciting coil 21 and the case 4. That is, the interposition member 5 having a higher thermal conductivity than air is provided not in the gap between the yoke 24 and the case 4 but in the gap between the exciting coil 21 and the case 4. In the example of FIG. 10, the interposition member 5 is provided so as to be in close contact with the exciting coil 21 and the case 4.

  In this case, as in the example of FIG. 10, the case 4 preferably includes a part made of a metal material including a region facing the interposition member 5. In the example of FIG. 10, similarly to the configuration of FIG. 4 described in the second embodiment, the region facing the interposition member 5 in the case 4 is a metal portion 44 made of a metal material, and the other regions are made of synthetic resin. It is.

  According to this configuration, since the interposition member 5 having a higher thermal conductivity than air is disposed in the gap between the excitation coil 21 and the case 4, heat is easily transmitted from the excitation coil 21 to the case 4. Therefore, the electromagnetic relay 1 can release the heat (Joule heat) generated in the exciting coil 21 when the exciting coil 21 is energized from the exciting coil 21 to the case 4 via the interposing member 5 and dissipate the heat from the case 4.

  Also in the present reference example, as in the example of FIG. 7 (first modification) described in the second embodiment, the case 4 may be entirely made of a metal material as shown in FIG. In this case, electrical insulation of the case 4 is ensured by an appropriate method such as attaching an insulating film.

<Second Reference Example>
In the electromagnetic relay 1 according to the second reference example, a part of the yoke 24 is exposed to the outside of the case 4 as shown in FIG.

  Specifically, an opening 46 that penetrates the lower wall 42 in the thickness direction (vertical direction) is formed in the lower wall 42 of the case 4, and the yoke 24 is exposed to the outside of the case 4 through the opening 46. In the example of FIG. 12, the lower plate 242 of the yoke 24 is fitted into the opening 46 so that the lower surface of the lower plate 242 is exposed from the opening 46.

  According to this configuration, since a part of the yoke 24 is exposed outside the case 4, the heat transferred from the exciting coil 21 to the yoke 24 is radiated to the outside of the case 4 through the yoke 24. become. Here, since the yoke 24 is arranged so as to surround the exciting coil 21, the electromagnetic relay 1 collects the heat generated in the exciting coil 21 in the yoke 24 and efficiently releases it to the outside of the case 4. Can do.

  The configurations of the first and second reference examples can be applied in appropriate combination with the configurations described in the first and second embodiments.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Electromagnet apparatus 21 Excitation coil 22 Movable element 23 Stator 24 Relay 3 Contact apparatus 31 Fixed contact 32 Movable contact 4 Case 45 Leaf spring 5 Interposition member 6 Crevice

Claims (6)

The magnet has an exciting coil, a mover, a stator, and a yoke, and attracts the mover to the stator by passing a magnetic flux generated by the exciting coil through the yoke arranged to surround the exciting coil. An electromagnet device for moving the mover;
The movable contact has a fixed contact and a movable contact, and the movable contact moves with the movement of the movable element, so that the movable contact contacts the fixed contact, and the movable contact is separated from the fixed contact. A contact device that switches between an open state and
A case for storing at least the electromagnet device;
An electromagnetic relay comprising: an intermediate member having a thermal conductivity higher than that of air and disposed in a gap between the yoke and the case. The electromagnetic relay according to claim 1, wherein the interposition member is made of an elastic material. 3. The electromagnetic relay according to claim 1, wherein a part of the case including a region facing the interposition member is made of a metal material. The electromagnetic relay according to claim 1 or 2, wherein the case is entirely made of a metal material. The case has a leaf spring made of a metal material in a region facing the interposition member,
The electromagnetic relay according to claim 3 or 4, wherein the leaf spring is pressed against the interposition member. The case has a convex portion on a part of the inner peripheral surface,
The electromagnetic relay according to any one of claims 1 to 5, wherein the interposition member is disposed between the convex portion and the yoke.

Images