JP2019016462A - Electromagnetic relay - Google Patents

Abstract

To provide an electromagnetic relay that can block inflow of outside air to a sealed space caused by the generation of arc.SOLUTION: An electromagnetic relay comprises: a contact case (30) that has a sealed space (70) therein; a pair of fixed terminals (31a, 31b) that are fixed to the contact case (30) and electrically independent of each other; a movable contactor (32) that is arranged in the sealed space (70); a pair of fixed contacts (33a, 33b) that are provided respectively on the pair of fixed terminals (31a, 31b); a pair of movable contacts (34a, 34b) that are provided respectively on the movable contactor (32); and permanent magnets (55a, 55b) that are arranged to face parts of lateral walls of the contact case (30). The contact case (30) has sealing layers (80) that are provided on inner surfaces or outer surfaces of lateral walls to which arc is attracted, and can block inflow of outside air to the sealed space (70).SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electromagnetic relay.

  The electromagnetic relay disclosed in Patent Document 1 is provided in a sealed space, a container having a sealed space inside, a pair of fixed terminals that are electrically fixed to the container independently of each other, and a pair of sealed terminals. A plate-shaped movable contact that is movable to face each fixed terminal and move toward or away from each of the pair of fixed terminals. A fixed contact is fixed to the tip of each of the pair of fixed terminals located in the closed space. In addition, a pair of movable contacts arranged to face each of the pair of fixed contacts is fixed to the movable contact.

Japanese Patent No. 5559662

  By the way, normally, gas (for example, hydrogen) with a high arc cooling effect is hermetically sealed in the sealed space inside the container. In this case, if the container is damaged by an arc generated when the pair of fixed contacts and the pair of movable contacts are opened and closed, outside air may flow into the sealed space and cause a gas explosion.

  Then, this invention makes it a subject to provide the electromagnetic relay which can seal the inflow of the external air to the sealed space resulting from generation | occurrence | production of an arc.

The electromagnetic relay of one embodiment of the present invention is
A box-shaped insulating contact case with a sealed space inside;
A pair of fixed terminals that are fixed to the contact case electrically independently from each other and each have a fixed contact arrangement surface in the sealed space;
The first surface is disposed in the sealed space and faces the fixed contact arrangement surface of the pair of fixed terminals, and the first surface is the fixed contact arrangement surface of the pair of fixed terminals. A plate-like movable contactor having conductivity, which is arranged so as to be movable in the approaching / separating direction that approaches and separates from it;
A pair of fixed contacts respectively provided on the fixed contact placement surface of the pair of fixed terminals;
The pair of fixed contacts are provided on the first surface of the movable contact, face each of the pair of fixed contacts, and the pair of fixed contacts as the movable contact approaches the pair of fixed terminals. A pair of movable contacts arranged to be in contact with each other and to be separated from each of the pair of fixed contacts in accordance with the separation of the movable contact with respect to the pair of fixed terminals,
An arc generated when the pair of movable contacts come into contact with or break apart from the pair of fixed contacts is arranged to face a part of the side wall of the contact case extending in the contact / separation direction. A permanent magnet attracted to the side wall of the contact case;
With
The contact case includes a sealing layer that is provided on an inner surface or an outer surface of the side wall from which the arc is attracted and can seal the inflow of outside air into the sealed space.

  According to the electromagnetic relay of the above aspect, the contact case is provided on the inner surface or the outer surface of the side wall from which the arc is attracted, and has a sealing layer that can seal the inflow of outside air into the sealed space. For example, even if the side wall of the contact case is damaged due to the generation of an arc, the sealing layer can seal the inflow of outside air into the sealed space.

The perspective view of the electromagnetic relay of one Embodiment of this invention. Sectional drawing along the II-II line of FIG. The top view of the state which removed the housing of the electromagnetic relay of FIG. The side view of the state which removed the housing of the electromagnetic relay of FIG. The side view which shows the modification of the electromagnetic relay of FIG. The top view which shows the contact case of the electromagnetic relay of FIG. 1, and the modification of a permanent magnet. Sectional drawing along the VI-VI line of FIG. 1 which shows the modification of the electromagnetic relay of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, terms indicating specific directions or positions (for example, terms including “up”, “down”, “right”, “left”) are used as necessary. Is for facilitating understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meaning of these terms. Further, the following description is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. Furthermore, the drawings are schematic, and the ratios of dimensions and the like do not necessarily match the actual ones.

  As shown in FIG. 1, the electromagnetic relay 100 according to an embodiment of the present invention includes an insulating housing 1 and a pair of fixed terminals 31 a and 31 b fixed to the housing 1. As shown in FIG. 2, the electromagnetic relay 100 is symmetrical with respect to a plane CP that passes through the center of the pair of fixed terminals 31a and 31b and extends in a direction orthogonal to the arrangement direction of the pair of fixed terminals 31a and 31b. Is provided.

  As shown in FIG. 2, a contact case 30 having a substantially rectangular parallelepiped shape is provided inside the housing 1. A sealed space 70 is formed inside the contact case 30, and the electromagnetic relay 100 is a conductive plate-like member provided in the closed space 70 so as to face the pair of fixed terminals 31 a and 31 b. The movable contact 32 is provided. Further, in the electromagnetic relay 100, the movable contact 32 is disposed so as to face each of the pair of fixed contacts 33a and 33b provided on the pair of fixed terminals 31a and 31b and the pair of fixed contacts 33a and 33b in the sealed space 70. And a pair of movable contacts 34a, 34b.

  Further, as shown in FIG. 3, the electromagnetic relay 100 has a contact / separation direction in which the pair of movable contacts 34 a, 34 b contact and separate from the pair of fixed contacts 33 a, 33 b (that is, the through direction in FIG. 3) The permanent magnet is arranged so as to face a part of the side walls 303 and 304 of the contact case 30 extending in the direction. In this embodiment, a pair of permanent magnets 55 a and 55 b is provided as an example, and each permanent magnet 55 a and 55 b is fixed to the cover 20.

  In addition, let the arrangement direction (left-right direction of FIG. 2) of a pair of fixed terminals 31a and 31b be X direction, and let the height direction (up-down direction of FIG. 2) of the electromagnetic relay 100 be Z direction. A direction orthogonal to the X and Z directions is defined as a Y direction.

  As shown in FIG. 1, the housing 1 includes a case 10 and a cover 20.

  As shown in FIG. 1, the case 10 has a substantially rectangular parallelepiped shape and a hollow box shape, and has a rectangular opening 11 on one of the surfaces facing in the longitudinal direction.

  As shown in FIG. 1, the cover 20 has a rectangular shape and is attached so as to cover the opening 11 of the case 10. Further, the cover 20 is provided with two circular terminal holes 21 arranged at intervals in the longitudinal direction, and a wall portion 22 arranged in the middle of the terminal hole 21 and extending along the plane CP. ing.

  As shown in FIG. 2, the contact case 30 includes a ceramic case 51 disposed adjacent to the cover 20 inside the housing 1, and a bottom side of the case 10 of the ceramic case 51 (that is, a lower side in the Z direction). A flange 52 extending from the end toward the bottom of the case 10 (that is, downward in the Z direction), a first yoke 53 disposed at an end of the flange 52 on the bottom side of the case 10, and a center of the first yoke 53 And a bottomed cylindrical body 54 extending from the vicinity of the portion toward the bottom of the case 10. The ceramic case 51, the flange 52, and the first yoke 53 are integrated, and the first yoke 53 and the bottomed cylindrical body 54 are airtightly joined. Thereby, a sealed space 70 is formed inside the contact case 30. The sealed space 70 is filled with a gas having a high arc cooling effect (for example, hydrogen or nitrogen).

  The ceramic case 51 has an insulating, substantially rectangular parallelepiped shape and a hollow box shape. A pair of terminal holes 511 arranged to face the terminal holes 21 of the cover 20 are provided on the surface of the ceramic case 51 facing the cover 20. In each terminal hole 511, a pair of fixed terminals 31a and 31b are inserted and fixed by brazing, for example. Moreover, the surface (namely, surface below Z direction) which opposes the bottom part of the case 10 of the ceramic case 51 is an opening surface in which the opening part was provided.

  The flange 52 has a cylindrical shape (for example, a substantially square cylindrical shape), and extends from the edge of the opening surface of the ceramic case 51 toward the bottom of the case 10 (that is, downward in the Z direction). The surface of the flange 52 facing the cover 20 and the surface facing the bottom of the case 10 are both open surfaces having openings.

  The first yoke 53 has a plate shape, and is arranged at the end of the flange 52 on the bottom side of the case 10 so that the plate surface faces the cover 20 and the bottom of the case 10. A hole 531 is provided at the center of the first yoke 53. The movable shaft 35 is movably inserted into the hole 531.

  The bottomed cylindrical body 54 has a circular or quadrangular shape, and extends from the vicinity of the center of the plate surface of the first yoke 53 facing the bottom of the case 10 toward the bottom of the case 10. A flange is provided at the end of the bottomed cylindrical body 54 on the first yoke 53 side and covers the hole 531 of the first yoke 53. Inside the bottomed cylindrical body 54, there are a substantially cylindrical rod-shaped movable shaft 35, a fixed iron core 57 fixed to the first yoke 53, and a distal end portion of the movable shaft 35 on the bottom side of the case 10 (that is, the bottom in the Z direction The movable iron core 58 fixed to the side end) is housed. A return spring 59 is provided between the fixed iron core 57 and the movable iron core 58 to urge the movable iron core 58 toward the bottom of the case 10 (that is, downward in the Z direction).

  As shown in FIG. 2, each of the pair of fixed terminals 31 a and 31 b has a substantially columnar shape, and is electrically fixed to the ceramic case 51 constituting the housing 1 independently of each other. The pair of fixed terminals 31 a and 31 b are arranged with a space therebetween along the arrangement direction (that is, the X direction), and a part of the fixed terminals 31 a and 31 b is located in the sealed space 70.

  Fixed contact arrangement surfaces 311 extending along the XY plane are provided on the end surfaces of the pair of fixed terminals 31a and 31b on the sealed space 70 side (that is, the end surfaces on the lower ends in the Z direction). Each fixed contact arrangement surface 311 is provided with fixed contacts 33a and 33b, respectively. The fixed contacts 33a and 33b may be formed integrally with the corresponding fixed terminals 31a and 31b, or may be formed separately from the corresponding fixed terminals 31a and 31b.

  As shown in FIG. 2, the movable contact 32 includes a first surface 321 extending along an XY plane facing the pair of fixed terminals 31a and 31b, and an XY on the opposite side of the first surface 321 with respect to the Z direction. And a second surface 322 extending along the plane.

  A pair of movable contacts 34 a and 34 b are provided on the first surface 321 of the movable contact 32. That is, the first surface 321 is a movable contact arrangement surface, and the pair of movable contacts 34 a and 34 b are electrically connected to each other by the movable contact 32. The pair of movable contacts 34a and 34b are arranged to face the pair of fixed contacts 33a and 33b, respectively. The movable contacts 34 a and 34 b may be formed integrally with the movable contact 32 or may be formed separately from the movable contact 32.

  As shown in FIG. 2, a coil spring 50 that extends and contracts along the movable shaft 35 is provided on the bottom side of the case 10 of the movable contact 32 (that is, on the lower side in the Z direction).

  As shown in FIG. 2, the electromagnet portion 40 includes an insulating spool 41, a coil 42 wound around the spool 41, and a coil terminal (not shown) fixed to the spool 41. Yes. The electromagnet portion 40 moves the movable shaft 35 up and down along the Z direction by applying a voltage to the coil 42, thereby moving the movable contact 32 relative to the fixed contact arrangement surface 311 of the pair of fixed terminals 31 a and 31 b. To approach or separate.

  In addition, a second yoke 44 having a substantially U shape in a cross section perpendicular to the plane CP is provided inside the housing 1. The second yoke 44 is connected to the first yoke 53 and is disposed inside the case 10 so as to surround the electromagnet portion 40 together with the first yoke 53.

  As shown in FIG. 3, the pair of permanent magnets 55 are disposed so as to face the pair of side walls of the contact case 30 extending in the arrangement direction (that is, the X direction) of the pair of fixed terminals 31 a and 31 b, respectively. An arc generated when the movable contacts 33 a and 33 b come into contact with or separate from the pair of fixed contacts 31 a and 31 b is attracted to the side wall of the contact case 30.

  Specifically, the pair of fixed contacts 33a and 33b and the pair of movable contacts 34a and 34b come into contact with each other, and a current flows from the right fixed terminal 31b in FIG. 3 toward the left fixed terminal 31a in FIG. It is assumed that the magnetic flux extends from the lower permanent magnet 55a toward the upper permanent magnet 55b in FIG. In this case, the arc generated between the right fixed contact 33b and the corresponding movable contact 34b is attracted to the right side wall 301 in FIG. 3 while approaching the upper permanent magnet 55b by the Lorentz force, The arc generated between the fixed contact 33a and the corresponding movable contact 34a is attracted to the left side wall 302 of FIG. 3 while approaching the lower permanent magnet 55a by Lorentz force.

  Next, the contact case 30 will be described in more detail with reference to FIGS. 3 and 4. 3 and 4, the housing 1 is omitted.

  As shown in FIGS. 3 and 4, the contact case 30 has a contact / separation direction in which the pair of movable contacts 34 a, 34 b contact and separate from the pair of fixed contacts 33 a, 33 b (that is, the through direction in FIG. 3). ), And a reinforcing layer 81 provided around the sealing layer 80. The sealing layer 80 is provided on the outer surface of the side wall extending in FIG. For example, the sealing layer 80 and the reinforcing layer 81 are made of conductive or insulating tape (for example, ceramic tape or resin adhesive tape).

  Specifically, the sealing layer 80 is formed on the side walls 301 and 302 of the contact case 30 to which an arc generated when the pair of movable contacts 34a and 34b come into contact with or break apart from the pair of fixed contacts 33a and 33b. It is provided in each part corresponding to the inner wall surface of the sealed space 70 on the outer surface. The reinforcing layer 81 is connected to the sealing layers 80 provided on the outer surfaces of the side walls 301 and 302, respectively. That is, each sealing layer 80 and the reinforcing layer 81 are integrally provided over the entire outer surface of the side wall of the contact case 30.

  In the electromagnetic relay 100, the contact case 30 is provided on the outer surface of the side walls 301 and 302 where the arc is attracted, and has a sealing layer 80 that can seal the inflow of outside air into the sealed space 70. For example, even if the side walls 301 and 302 of the contact case 30 are damaged due to generation of an arc, the sealing layer 80 can seal the inflow of outside air into the sealed space 70.

  The contact case 30 is provided around the sealing layer 80, and a reinforcing layer 81 that reinforces the sealing of the sealing layer 80 is provided. For example, even if cracks exceeding the sealing layer 80 are formed on the side walls 301 and 302 of the contact case 30 due to the generation of an arc, the reinforcing layer 81 causes the outside air to enter the sealed space 70 for cracks exceeding the sealing layer 80. Inflow can be sealed.

  Further, the sealing layer 80 and the reinforcing layer 81 are integrally provided over the entire periphery of the side wall of the contact case 30. As a result, the inflow of outside air into the sealed space 70 can be more reliably sealed.

  Further, the sealing layer 80 has a larger layer thickness than the reinforcing layer 81. Thereby, the manufacturing cost can be reduced while enabling the inflow of outside air into the sealed space 70 to be sealed.

  In the present invention, the side walls 301 and 302 where the arc of the contact case 30 is attracted may be provided with a sealing layer 80 that can seal the inflow of outside air into the sealed space 70. For example, FIG. As shown, the reinforcing layer 81 may be omitted.

  The sealing layer 80 and the reinforcing layer 81 are not limited to the outer surfaces facing the housing 1 of the side walls 301 and 302 where the arc of the contact case 30 is attracted, but may be provided on the inner surface on the sealed space 70 side.

  Further, the sealing layer 80 and the reinforcing layer 81 are not limited to being integrally formed, and may be formed separately.

  Further, the sealing layer 80 and the reinforcing layer 81 may have the same layer thickness.

  Further, the sealing layer 80 and the reinforcing layer 81 are not limited to conductive or insulating tape, and may be made of a thermoplastic resin such as urethane.

  The contact case 30 is not limited to a substantially rectangular parallelepiped shape, and may be a cylindrical shape, for example, as shown in FIG. Further, the contact case 30 is not limited to the case of the ceramic case 51, the flange 52, the first yoke 53, and the bottomed cylindrical body 54, but has an arbitrary structure capable of forming the sealed space 70 therein. Can be adopted. For example, instead of the ceramic case 51, a structure using a housing made of heat sealing resin may be adopted. That is, the contact case 30 can be configured in any structure, shape, and size depending on the design of the electromagnetic relay 100 or the like.

  The permanent magnets 55a and 55b are not limited to being arranged so as to face the pair of side walls of the contact case 30 extending in the arrangement direction of the pair of fixed terminals 31a and 31b. For example, it arrange | positions so that it may each oppose to a pair of side wall of the contact case 30 extended in the direction (for example, orthogonal direction) crossing the arrangement direction of a pair of fixed terminal 31a, 31b (at the position of A and B shown in FIG. 6). May be. Further, at least one permanent magnet 55a, 55b may be provided, and for example, it may be arranged at any position of A to D shown in FIG. 6 facing a part of the side wall of the contact case 30. . When the number and arrangement of the permanent magnets change, the position of the side wall of the contact case 30 where the arc is attracted also changes.

  In addition, the permanent magnets 55a and 55b are not limited to being disposed outside the contact case 30, but may be disposed in the sealed space 70 inside the contact case 30, for example, It may be arranged inside.

  As shown in FIG. 7, the electromagnetic relay 100 may further include a sealing portion 90 that covers the outer surface of the side wall of the contact case 30 and can seal the inflow of outside air into the sealed space 70. As a result, the inflow of outside air into the sealed space 70 can be more reliably sealed. In addition, the sealing part 90 can be comprised with thermoplastic resins, such as urethane, for example.

  As mentioned above, although various embodiment in this invention was described in detail with reference to drawings, finally the various aspect of this invention is demonstrated.

The electromagnetic relay according to the first aspect of the present invention is:
A box-shaped insulating contact case with a sealed space inside;
A pair of fixed terminals that are fixed to the contact case electrically independently from each other and each have a fixed contact arrangement surface in the sealed space;
The first surface is disposed in the sealed space and faces the fixed contact arrangement surface of the pair of fixed terminals, and the first surface is the fixed contact arrangement surface of the pair of fixed terminals. A plate-like movable contactor having conductivity, which is arranged so as to be movable in the approaching / separating direction that approaches and separates from it;
A pair of fixed contacts respectively provided on the fixed contact placement surface of the pair of fixed terminals;
The pair of fixed contacts are provided on the first surface of the movable contact, face each of the pair of fixed contacts, and the pair of fixed contacts as the movable contact approaches the pair of fixed terminals. A pair of movable contacts arranged to be in contact with each other and to be separated from each of the pair of fixed contacts in accordance with the separation of the movable contact with respect to the pair of fixed terminals,
An arc generated when the pair of movable contacts come into contact with or break apart from the pair of fixed contacts is arranged to face a part of the side wall of the contact case extending in the contact / separation direction. A permanent magnet attracted to the side wall of the contact case;
With
The contact case includes a sealing layer that is provided on an inner surface or an outer surface of the side wall from which the arc is attracted and can seal the inflow of outside air into the sealed space.

  According to the electromagnetic relay of the first aspect, for example, even if the side wall of the contact case is damaged due to generation of an arc, the inflow of outside air into the sealed space can be sealed.

The electromagnetic relay of the second aspect of the present invention is
The contact case is connected to the sealing layer, and a reinforcing layer is provided to reinforce the sealing of the sealing layer.

  According to the electromagnetic relay of the second aspect, for example, even if a crack exceeding the sealing layer is formed on the side wall of the contact case due to generation of an arc, the inflow of outside air into the sealed space can be sealed.

The electromagnetic relay of the third aspect of the present invention is
The sealing layer and the reinforcing layer are integrally provided over the entire circumference of the side wall of the contact case.

  According to the electromagnetic relay of the third aspect, the inflow of outside air into the sealed space can be more reliably sealed.

The electromagnetic relay of the fourth aspect of the present invention is
The sealing layer has a larger layer thickness than the reinforcing layer.

  According to the electromagnetic relay of the fourth aspect, the manufacturing cost can be reduced while enabling the inflow of outside air into the sealed space to be sealed.

The electromagnetic relay of the fifth aspect of the present invention is
The apparatus further includes a sealing portion that covers an outer surface of the side wall and that can seal inflow of outside air into the sealed space.

  According to the electromagnetic relay of the fifth aspect, the inflow of outside air into the sealed space can be more reliably sealed.

The electromagnetic relay of the sixth aspect of the present invention is
The sealing layer is made of a conductive or insulating tape.

  According to the electromagnetic relay of the sixth aspect, for example, even if the side wall of the contact case is damaged due to the generation of an arc, the inflow of outside air into the sealed space can be sealed.

  In addition, it can be made to show the effect which each has by combining arbitrary embodiment or modification of the said various embodiment or modification suitably. In addition, combinations of the embodiments, combinations of the examples, or combinations of the embodiments and examples are possible, and combinations of features in different embodiments or examples are also possible.

  The electromagnetic relay of the present invention can be applied to automobiles, for example.

DESCRIPTION OF SYMBOLS 1 Housing 10 Case 11 Opening part 20 Cover 21 Terminal hole 22 Wall part 30 Contact case 301,302,303,304 Side wall 31a, 31b Fixed terminal 311 Fixed contact arrangement surface 32 Movable contact 321 1st surface 322 2nd surface 33a, 33b Fixed contacts 34a, 34b Movable contact 35 Movable shaft 40 Electromagnet part 41 Spool 42 Coil 44 Second yoke 50 Coil spring 51 Ceramic case 511 Terminal hole 52 Flange 53 First yoke 531 Hole part 54 Bottomed cylindrical body 55a, 55b Permanent magnet 57 Fixed iron core 58 Movable iron core 59 Return spring 70 Sealed space 80 Sealing layer 81 Reinforcing layer 90 Sealing part 100 Electromagnetic relay

Claims (6)

A box-shaped insulating contact case with a sealed space inside;
A pair of fixed terminals that are fixed to the contact case electrically independently from each other and each have a fixed contact arrangement surface in the sealed space;
The first surface is disposed in the sealed space and faces the fixed contact arrangement surface of the pair of fixed terminals, and the first surface is the fixed contact arrangement surface of the pair of fixed terminals. A plate-like movable contactor having conductivity, which is arranged so as to be movable in the approaching / separating direction that approaches and separates from it;
A pair of fixed contacts respectively provided on the fixed contact placement surface of the pair of fixed terminals;
The pair of fixed contacts are provided on the first surface of the movable contact, face each of the pair of fixed contacts, and the pair of fixed contacts as the movable contact approaches the pair of fixed terminals. A pair of movable contacts arranged to be in contact with each other and to be separated from each of the pair of fixed contacts in accordance with the separation of the movable contact with respect to the pair of fixed terminals,
An arc generated when the pair of movable contacts come into contact with or break apart from the pair of fixed contacts is arranged to face a part of the side wall of the contact case extending in the contact / separation direction. A permanent magnet attracted to the side wall of the contact case;
With
The electromagnetic relay, wherein the contact case has a sealing layer that is provided on an inner surface or an outer surface of the side wall from which the arc is attracted and can seal the inflow of outside air into the sealed space.   The electromagnetic relay according to claim 1, wherein the contact case is connected to the sealing layer and provided with a reinforcing layer that reinforces the sealing of the sealing layer.   The electromagnetic relay according to claim 2, wherein the sealing layer and the reinforcing layer are integrally provided over the entire circumference of the side wall of the contact case.   The electromagnetic relay according to claim 2 or 3, wherein the sealing layer has a larger layer thickness than the reinforcing layer.   5. The electromagnetic relay according to claim 1, further comprising a sealing portion that covers an outer surface of the side wall and seals inflow of outside air into the sealed space.   The electromagnetic relay according to claim 1, wherein the sealing layer is made of a conductive or insulating tape.

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