Electromagnetic relay
The electromagnetic relay design with an isolation wall and heat dissipation section effectively guides and condenses water vapor away from contacts, ensuring reliable electrical contact by preventing dew condensation.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- DENSO ELECTRONICS CORP ANJO CITY
- Filing Date
- 2025-12-24
- Publication Date
- 2026-07-23
AI Technical Summary
Existing electromagnetic relays face the risk of dew condensation on fixed and movable contacts due to water vapor generated by the electromagnetic coil, which can lead to contact failure, especially in low-temperature environments.
Incorporation of an isolation wall and a heat dissipation section within the electromagnetic relay's design to guide and condense water vapor away from the switch area, preventing it from reaching the contacts.
Prevents water vapor from adhering to the contacts, thereby maintaining reliable electrical contact and reducing the risk of contact failure.
Smart Images
Figure JP2025045372_23072026_PF_FP_ABST
Abstract
Description
Electromagnetic relay Cross-reference to related applications
[0001] This application is based on Japanese Patent Application No. 2025-005568 filed on January 15, 2025, the contents of which are incorporated herein by reference.
[0002] This disclosure relates to an electromagnetic relay.
[0003] Conventionally, in an electromagnetic relay, a structure has been proposed in which a fixed contact, a movable contact, and an electromagnetic coil are housed in a case (see, for example, Patent Document 1). The movable contact is configured to contact or separate from the fixed contact by displacement. Further, the electromagnetic coil generates an electromagnetic force that displaces the movable contact. A metal plate is disposed on the ceiling surface inside the case. Therefore, when the outside air outside the case is at a low temperature, the metal plate is cooled by the outside air outside the case. For this reason, the water vapor generated by the heat generation of the electromagnetic coil is cooled by the metal plate and dew condensation occurs on the metal plate. Thereby, the water vapor around the fixed contact and the movable contact inside the case can be reduced. Therefore, it is possible to prevent dew condensation from occurring on the fixed contact and the movable contact.
[0004] Japanese Unexamined Patent Application Publication No. 2010-108661
[0005] In the above electromagnetic relay, the metal plate can prevent dew condensation from occurring on the fixed contact and the movable contact by cooling the water vapor in the case with the metal plate and causing dew condensation on the metal plate. However, according to the inventor's study, depending on the internal structure of the case, the water vapor generated by the heat generation of the electromagnetic coil may not reach the metal plate. In this case, there is a risk that the water vapor generated by the heat generation of the electromagnetic coil is cooled by the fixed contact or the movable contact and dew condensation occurs on the fixed contact or the movable contact.
[0006] An object of this disclosure is to provide an electromagnetic relay that suppresses the flow of water vapor to a fixed contact and a movable contact.
[0007] According to one aspect of this disclosure, an electromagnetic relay comprises a case forming a storage chamber; first terminals and second terminals made of a conductive material and exposed to the outside of the case; a fixed contact made of a conductive material and housed in the storage chamber exposed to the air inside the storage chamber; a movable contact made of a conductive material and housed in the storage chamber exposed to the air inside the storage chamber, and configured to be able to contact or separate from the fixed contact by displacement, wherein the connection between the first and second terminals becomes conductive when the movable contact contacts the fixed contact, and the connection between the first and second terminals becomes non-conductive when the movable contact separates from the fixed contact; an electromagnetic coil housed in the storage chamber and generating a magnetic force that displaces the movable contact when energized; and an isolation wall that prevents water vapor generated by the heat generated by the electromagnetic coil when energized from flowing to the switch side.
[0008] Therefore, by preventing water vapor from flowing to the switch side with an isolation wall, it is possible to provide an electromagnetic relay that prevents water vapor from flowing to fixed contacts and movable contacts.
[0009] This is a perspective view showing the external shape of an electromagnetic relay in the first embodiment of this disclosure. This is a cross-sectional view showing the internal configuration of the electromagnetic relay in the first embodiment of Figure 1. This is a cross-sectional view of the electromagnetic relay in Figure 2, cut by a plane extending in the axial direction and the depth direction. This is a cross-sectional view of the wires of the electromagnetic coil in Figure 2, cut by a plane perpendicular to the direction in which the core wires extend. This is a cross-sectional view taken along V-V in Figure 3. This is a cross-sectional view taken along VI-VI in Figure 3. This is a cross-sectional view showing the periphery of the heat dissipation section of an electromagnetic relay in the second embodiment of this disclosure. This is a cross-sectional view showing the periphery of the heat dissipation section of an electromagnetic relay in the third embodiment of this disclosure. This is a cross-sectional view showing the periphery of the heat dissipation section of an electromagnetic relay in the fourth embodiment of this disclosure. This is a cross-sectional view showing the periphery of the heat dissipation section of an electromagnetic relay in the fifth embodiment of this disclosure. This is a cross-sectional view showing the periphery of the heat dissipation section of an electromagnetic relay in the sixth embodiment of this disclosure.
[0010] The embodiments of this disclosure will be described below with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings in order to simplify the explanation. (First Embodiment) The first embodiment relating to the electromagnetic relay 1 of this disclosure will be described with reference to Figures 1 to 6. The electromagnetic relay 1 of this embodiment is a switch that connects or disconnects an electrical circuit mounted on an automobile. The upward arrow in Figure 1 indicates the upper side of the vertical direction Ya of the electromagnetic relay 1 when it is mounted on an automobile, and the downward arrow in Figure 1 indicates the lower side of the vertical direction Ya of the electromagnetic relay 1 when it is mounted on an automobile.
[0011] As shown in Figures 1, 2, 3, 5, and 6, the electromagnetic relay 1 comprises a case 10, a plunger 20, a solenoid section 30, fixed contacts 40a, 40b, 40c, and a movable element 50. The electromagnetic relay 1 is provided with springs 60a, 60b, an isolation wall 70, a heat dissipation section 80, terminals 90a, 90b, and arc extinguishing magnets 100a, 100b. The outside of the case 10 is exposed to the air. The case 10 is formed in a substantially rectangular parallelepiped shape. The case 10 comprises a cover section 11 and a case body 12.
[0012] The cover portion 11 and the case body 12 constitute the storage chamber 10a. The cover portion 11 and the case body 12 are each made of an electrically insulating material, such as a resin material. Furthermore, the storage chamber 10a houses the plunger 20, solenoid portion 30, fixed contacts 40a, 40b, 40c, movable element 50, springs 60a, 60b, isolation wall 70, and heat dissipation portion 80, etc. Air is contained within the storage chamber 10a.
[0013] Therefore, the plunger 20, solenoid section 30, fixed contacts 40a, 40b, 40c, movable element 50, springs 60a, 60b, isolation wall 70, and heat dissipation section 80 are each exposed to the air inside the storage chamber 10a. The cover section 11 is formed to cover the case body 12 from above in the vertical direction Ya. A first region 12a for housing the plunger 20 and solenoid section 30 is formed between the case body 12 and the ceiling surface 11b of the cover section 11.
[0014] The ceiling surface 11b is an inner wall formed on the upper side of the cover portion 11 relative to the storage chamber 10a. The first region 12a is the region of the storage chamber 10a on the other side in the axial direction Yb. The axial direction Yb is the first direction in which the axis Za of the plunger 20 extends, with one side being the side from the solenoid portion 30 toward the movable element 50, and the other side being the opposite side. That is, the axial direction Yb is the displacement direction of the movable contacts 51a, 51b, and 51c of the movable element 50. The axial direction Yb is a direction that intersects the vertical direction Ya. In this embodiment, the axial direction Yb is a horizontal direction perpendicular to the vertical direction Ya (i.e., the second direction). The case body 12 supports the plunger 20, solenoid portion 30, etc. from below in the vertical direction Ya.
[0015] Here, the case body 12 includes inner cases 12X and 12Y arranged within the storage chamber 10a. Inner case 12X, together with inner case 12Y, forms a second region 12b within the storage chamber 10a for housing the fixed contacts 40a, 40b, 40c, the movable element 50, and the spring 60b. Inner case 12Y is arranged within the storage chamber 10a and is formed to cover the fixed contacts 40a, 40b, 40c, the movable element 50, and the spring 60b from one side and the other side in the depth direction Yc. Inner case 12Y is formed to cover the fixed contacts 40a, 40b, 40c, the movable element 50, and the spring 60b from one side in the axial direction Yb.
[0016] The fixed contacts 40a, 40b, 40c, the movable element 50, and the spring 60b are arranged on one side in the axial direction Yb relative to the plunger 20 and the solenoid section 30. Therefore, the second region 12b is arranged on one side in the axial direction Yb relative to the first region 12a within the storage chamber 10a. The water vapor passage 110 is formed within the storage chamber 10a between the electromagnetic coil 31, the inner case 12X, and the ceiling surface 11b of the cover section 11. As will be described later, the water vapor passage 110 is an air passage for guiding water vapor generated from the electromagnetic coil 31 to the heat dissipation section 80.
[0017] Here, the plunger 20 comprises a shaft portion 21, a movable core 22, and an insulator portion 23. The shaft portion 21 is located in the storage chamber 10a. The shaft portion 21 is formed in an elongated, substantially cylindrical shape extending in the axial direction Yb with the axis Za as its center. The other side of the shaft portion 21 in the axial direction Yb is located in the through hole 33a of the fixed core 33. The shaft portion 21 is fixed to the movable core 22 by passing through the through hole 22a of the movable core 22.
[0018] One side of the shaft portion 21 in the axial direction Yb is fitted into the hole portion 23a of the insulator portion 23. The shaft portion 21 and the insulator portion 23 are configured to move in the axial direction Yb within a through hole 12e in the case wall 12d, which is part of the inner case 12X. The case wall 12d is a wall that separates the first region 12a and the second region 12b. The through hole 12e is formed to penetrate the case wall 12d in the axial direction Yb.
[0019] The movable core 22 is formed in a substantially disc shape centered on the axis Za. The movable core 22 is provided with a through hole 22a that penetrates in the axial direction Yb. The movable core 22 is supported by the bobbin 32 via a spring 60a. The movable core 22 is positioned between the case wall 12d of the case body 12 and the fixed core 33. The movable core 22 is configured to be movable in the axial direction Yb between the case wall 12d of the case body 12 and the fixed core 33. The movable core 22 is made of a magnetic metal material.
[0020] In this embodiment, the spring 60a generates an elastic force that acts on one side of the movable core 22 in the axial direction Yb. The spring 60a is composed of a coil spring with axis Za as its centerline. The spring 60a is positioned radially outward from the fixed core 33 with axis Za as its centerline. The other side of the spring 60a in the axial direction Yb is supported by the bobbin 32. The other side of the spring 60a in the axial direction Yb is supported by the movable core 22.
[0021] The insulator portion 23 is located on one side of the shaft portion 21 in the axial direction Yb. The insulator portion 23 is formed in a cylindrical shape with the axis Za as its center. On the other side of the insulator portion 23 in the axial direction Yb, there is a hole portion 23a that is recessed to the one side in the axial direction Yb. The shaft portion 21 is fixed to the insulator portion 23 with the shaft portion 21 fitted into the hole portion 23a. The insulator portion 23 is made of an electrically insulating resin material. The insulator portion 23 ensures electrical insulation between the shaft portion 21 and the movable busbar 52.
[0022] The solenoid unit 30 comprises an electromagnetic coil 31, a bobbin 32, and a fixed core 33. The electromagnetic coil 31 is positioned radially outward from the bobbin 32 with the axis Za as its centerline. The electromagnetic coil 31 is constructed by winding an electric wire 36 with the axis Za as its centerline. As shown in Figure 4, the electric wire 36 comprises a core wire 36a formed in a linear shape from a conductive metal material such as copper and which conducts electricity, and a covering portion 36b formed to cover the core wire 36a with an electrically insulating resin material. Figure 4 is a cross-sectional view of the electric wire 36 cut by a plane perpendicular to the direction in which the core wire 36a extends.
[0023] Here, one end of the electric wire 36 is connected to the first coil terminal 37a. The other end of the electric wire 36 is connected to a second coil terminal (not shown). The first coil terminal 37a, together with the second coil terminal, is formed to protrude downward from the case body 12 in the vertical direction Ya. The bobbin 32 is positioned radially outward from the shaft portion 21 with the axis Za as its center. The bobbin 32 is formed in a substantially cylindrical shape with the axis Za as its center and holds the wound electric wire 36. The fixed core 33 is formed in a cylindrical shape extending in the axial direction Yb with the axis Za as its center. The fixed core 33 is positioned radially inward from the electromagnetic coil 31 and the bobbin 32 with the axis Za as its center.
[0024] The fixed core 33 is positioned on the other side of the movable core 22 in the axial direction Yb. The fixed core 33 is made of a metallic material, such as iron, which is a magnetic material. The fixed core 33 is supported by the case 10 together with the bobbin 32. The fixed core 33 forms a magnetic path through which the magnetic field generated by the electromagnetic coil 31 passes. The fixed core 33 has a through hole 33a that penetrates in the axial direction Yb with the axis Za as the center line.
[0025] The fixed contacts 40a, 40b, 40c and the movable element 50 are arranged within the second region 12b, as shown in Figures 3, 5, and 6. Figure 5 is a cross-sectional view taken along line V-V in Figure 3, and Figure 6 is a cross-sectional view taken along line VI-VI in Figure 3. The fixed contacts 40a, 40b, and 40c are each positioned on one side in the axial direction Yb relative to the case wall 12d. The fixed contact 40a is positioned on the other side in the depth direction Yc relative to the axis Za. The fixed contact 40a is fixed to one end of the terminal 90a, for example, by crimping.
[0026] The fixed contact 40a is made of a conductive metal material such as copper. The fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c of the movable element 50 are positioned offset from the electromagnetic coil 31 in the axial direction Yb. That is, the fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c are positioned offset from the electromagnetic coil 31 in the horizontal direction.
[0027] One end of the terminal 90a is located within the second region 12b of the storage chamber 10a. The other end of the terminal 90a is located on the other side of the depth direction Yc with respect to the axis Za. The terminal 90a is supported by the case body 12. The other end of the terminal 90a is located below the case 10 in the vertical direction Ya. The other end of the terminal 90a is exposed to the outside of the case 10. The terminal 90a is made of a conductive metal material such as copper.
[0028] The fixed contacts 40b and 40c are each positioned on one side in the depth direction Yc with respect to the axis Za. The fixed contacts 40b and 40c are each positioned with a gap between them in the vertical direction Ya. The fixed contacts 40b and 40c are each fixed to one end of the terminal 90b by, for example, crimping. The fixed contacts 40b and 40c are each made of a conductive metal material such as copper.
[0029] The terminal 90b is located within the second region 12b of the storage chamber 10a. One end of the terminal 90b is positioned on one side in the depth direction Yc with respect to the axis Za. The terminal 90b is supported by the case body 12. The other end of the terminal 90b is positioned below the case 10 in the vertical direction Ya. The other end of the terminal 90b is exposed to the outside of the case 10. The terminal 90b is made of a conductive metal material such as copper.
[0030] In this embodiment, terminals 90a and 90b are first and second terminals, respectively, spaced apart in the depth direction Yc. Terminals 90a and 90b are supported by the case body 12 of the case 10 and are formed to extend downward from the case body 12 of the case 10 in the vertical direction Ya. Terminals 90a and 90b each constitute an electrical circuit mounted in an automobile.
[0031] The movable element 50 is located in the second region 12b of the storage chamber 10a. The movable element 50 is located on one side in the axial direction Yb relative to the fixed contacts 40a, 40b, and 40c. The movable element 50 comprises movable contacts 51a, 51b, 51c, a movable busbar 52, and a movable support member 53. The movable contact 51a is located on the other side in the depth direction Yc relative to the axis Za. The movable contact 51a is fixed to the movable busbar 52.
[0032] The movable contact 51a is positioned on one side in the axial direction Yb relative to the fixed contact 40a. The movable contact 51a is positioned opposite the fixed contact 40a. As will be described later, the movable contact 51a is configured to either contact the fixed contact 40a or move away from the fixed contact 40a. The movable contact 51a is made of a conductive metal material such as copper. The movable contacts 51b and 51c are each positioned on one side in the depth direction Yc relative to the axis Za.
[0033] Here, the movable contacts 51b and 51c are fixed to the movable busbar 52. The movable contacts 51b and 51c are spaced apart in the vertical direction Ya. The movable contact 51b is positioned on one side of the fixed contact 40b in the axial direction Yb. The movable contact 51b is positioned opposite the fixed contact 40b. As will be described later, the movable contact 51b is configured to either contact the fixed contact 40b or to be away from the fixed contact 40b.
[0034] The movable contact 51c is positioned on one side of the fixed contact 40c in the axial direction Yb. As will be described later, the movable contact 51c is configured to either contact the fixed contact 40c or move away from the fixed contact 40c. The movable contacts 51b and 51c are each made of a conductive metal material such as copper. The movable busbar 52 is formed in a plate shape with the axial direction Yb as its thickness direction and extending in the vertical direction Ya. The movable busbar 52 is electrically connected to each of the movable contacts 51a, 51b, and 51c. Together with the fixed contacts 40a, 40b, and 40c, the movable contacts 51a, 51b, and 51c constitute a switch 55 that connects or disconnects terminals 90a and 90b.
[0035] The movable busbar 52 is made of a conductive metal material such as copper. The movable support member 53 is positioned on one side of the movable busbar 52 in the axial direction Yb. The movable support member 53 is fixed to the movable busbar 52. The movable support member 53 supports the spring 60b from the other side in the axial direction Yb. The spring 60b is positioned between the inner case 12Y and the movable support member 53.
[0036] The inner case 12X is located within the second region 12b. The inner case 12X is supported by the cover portion 11. The inner case 12X is made of an electrically insulating resin material or the like. The spring 60b, while supported by the inner case 12X, applies an elastic force to the movable support member 53 acting on the other side in the axial direction Yb. The spring 60b is made of, for example, a coil spring. As a result, the movable element 50 is subjected to the elastic force of the spring 60b acting on the other side in the axial direction Yb.
[0037] The isolation wall 70 is located within the water vapor passage 110. The isolation wall 70 is positioned above the fixed contacts 40a, 40b, 40c, the movable contacts 51a, 51b, 51c, and the electromagnetic coil 31 in the vertical direction Ya. The isolation wall 70 is positioned below the heat dissipation section 80 in the vertical direction Ya. The isolation wall 70 is positioned between the ceiling surface 11b of the cover section 11 and the inner case 12X. The isolation wall 70 is formed in a plate shape with the vertical direction Ya as the thickness direction. The isolation wall 70 is positioned offset from the electromagnetic coil 31 in the axial direction Yb (i.e., horizontal direction). The isolation wall 70 is formed to cover the switch 55 from above in the vertical direction Ya.
[0038] The isolation wall 70 has a guide surface 71 that advances upward in the vertical direction Ya as it moves from the other side in the axial direction Yb to the one side. That is, the guide surface 71 is formed so that it approaches the heat dissipation section 80 as it moves away from the electromagnetic coil 31. In this embodiment, one end of the isolation wall 70 in the axial direction Yb is supported by the cover section 11. The other end of the isolation wall 70 in the axial direction Yb is supported by the inner case 12X. The isolation wall 70 is made of an electrically insulating resin material. As will be described later, the isolation wall 70 prevents water vapor generated from the covering portion 36b of the electric wire 36 of the electromagnetic coil 31 from flowing to the switch 55 side by guiding the water vapor to the opposite side of the inner case 12X (i.e., upward in the vertical direction Ya).
[0039] The heat dissipation section 80 is positioned on the ceiling surface 11b of the cover section 11. The heat dissipation section 80 is formed to conform to the ceiling surface 11b of the cover section 11. The heat dissipation section 80 is formed in the shape of a thin plate, with the vertical direction Ya being the thickness direction and extending in the axial direction Yb and the depth direction Yc. The heat dissipation section 80 is positioned above the isolation wall 70 in the vertical direction Ya. The heat dissipation section 80 is fixed to the ceiling surface 11b of the cover section 11 with an adhesive or the like. Furthermore, the heat dissipation section 80 is made of a metal material such as copper, which has a higher thermal conductivity than the cover section 11. The heat dissipation section 80 plays a role in condensing water vapor.
[0040] As shown in Figure 3, the arc extinguishing magnet 100a is positioned on the other side of the depth direction Yc relative to the fixed contact 40a and the movable contact 51a. The arc extinguishing magnet 100a is made of a permanent magnet and serves to extinguish the arc that occurs between the fixed contact 40a and the movable contact 51a. The arc extinguishing magnet 100a is supported by the inner case 12X. The arc extinguishing magnet 100b is positioned on one side of the depth direction Yc relative to the fixed contacts 40a, 40b, 40c and the movable contacts 51b, 51c. The arc extinguishing magnet 100b is made of a permanent magnet and serves to extinguish the arc that occurs between the fixed contacts 40b, 40c and the movable contacts 51b, 51c. The arc extinguishing magnet 100b is supported by the inner case 12X.
[0041] Next, the operation of the electromagnetic relay 1 of this embodiment will be described with reference to Figures 1, 2, 3, 5, and 6. First, when no current is flowing through the core wire 36a of the electric wire 36 of the electromagnetic coil 31, the spring 60a, supported by the bobbin 32, applies an elastic force to the movable core 22 acting on one side in the axial direction Yb. As a result, the elastic force of the spring 60a is transmitted to the movable support member 53 through the movable core 22, shaft portion 21, insulator portion 23, and movable busbar 52. As a result, the spring 60b, compressed by the movable support member 53, applies an elastic force to the movable support member 53 acting on the other side in the axial direction Yb. At this time, the movable core 22 is maintained at a position with a gap between it and the fixed core 33 on one side in the axial direction Yb by the elastic forces of the springs 60a and 60b.
[0042] And the mover 50 is arranged at an interval on one side in the axial direction Yb with respect to the fixed contacts 40a, 40b, and 40c. For this reason, the movable contact 51a is separated from the fixed contact 40a, and the movable contact 51b is separated from the fixed contact 40b. Further, the movable contact 51c is separated from the fixed contact 40c. As a result, between the terminals 90a and 90b, it is opened and becomes non-conductive. That is, the electromagnetic relay 1 is in an off state.
[0043] Next, when current flows through the core wire 36a of the electric wire 36 of the electromagnetic coil 31, a magnetic flux is generated from the electromagnetic coil 31. The magnetic flux passes through the shaft portion 21, the movable core 22, and the fixed core 33. At this time, between the fixed core 33 and the shaft portion 21, a magnetic force as an attractive force that attracts the movable core 22 to the fixed core 33 is generated. Along with this, the movable core 22 moves to the other side in the axial direction Yb together with the shaft portion 21 and the insulator portion 23 while compressing the spring 60a in the axial direction Yb by the above-described magnetic force.
[0044] Along with this, the insulator portion 23 separates from the movable bus bar 52, and the elastic force of the spring 60a being applied from the insulator portion 23 to the movable bus bar 52 is stopped. For this reason, the compressed state of the spring 60b is relaxed and it extends. Thus, the movable bus bar 52 moves to the other side in the axial direction Yb. For this reason, the movable contacts 51a, 51b, 51c, and the movable support member 53 move to the other side in the axial direction Yb. At this time, the movable contact 51a contacts the fixed contact 40a, and the movable contact 51b contacts the fixed contact 40b.
[0045] Further, the movable contact 51c comes into contact with the fixed contact 40c. As a result, the terminals 90a and 90b are connected through the fixed bus bar 31a, the fixed contacts 40a, the movable contacts 51a, the movable bus bar 52, the movable contacts 51b, 51c, the fixed contacts 40b, and 40c. As a result, between the terminals 90a and 90b of the electromagnetic relay 1, they are connected and become conductive. At this time, the compressed state of the spring 60b is relaxed, and the spring 60a is in a compressed state in the axial direction Yb.
[0046] Thereafter, the flow of current through the core wire 36a of the electric wire 36 of the electromagnetic coil 31 is stopped. Then, the generation of magnetic flux from the electromagnetic coil 31 is stopped. For this reason, the magnetic force as the attractive force that attracts the movable core 22 to the fixed core 33 does not occur. Along with this, the spring 60a is relaxed from the compressed state and extends, and gives an elastic force acting on one side in the axial direction Yb to the movable core 22. For this reason, the movable core 22 moves to one side in the axial direction Yb by the elastic force of the spring 60a together with the shaft portion 21 and the insulator portion 23.
[0047] At this time, the mover 50 is pushed by the insulator portion 23 and moves to one side in the axial direction Yb. For this reason, the movable contact 51a separates from the fixed contact 40a, and the movable contact 51b separates from the fixed contact 40b. Further, the movable contact 51c separates from the fixed contact 40c. As a result, the spring 60b is pushed by the movable support member 53 and is in a compressed state in the axial direction Yb. For this reason, between the terminals 90a and 90b is opened and becomes non-conductive. Thereby, the electromagnetic relay 1 becomes an off state.
[0048] As described above, in the electromagnetic relay 1, in an electric circuit, the movable contacts 51a, 51b, 51c contact the corresponding fixed contacts among the fixed contacts 40a, 40b, 40c by the magnetic force of the electromagnetic coil 31. Therefore, between the terminals 90a and 90b becomes conductive. On the other hand, in an electric circuit, when the output of the magnetic force by the electromagnetic coil 31 is stopped, the movable contacts 51a, 51b, 51c separate from the fixed contacts 40a, 40b, 40c by the elastic forces of the springs 60a and 60b. Therefore, between the terminals 90a and 90b becomes non-conductive.
[0049] Next, the operation of the electromagnetic relay 1 mounted on an automobile parked in a cold region or the like will be described. First, the other ends of the terminals 90a and 90b are each exposed outside the case 10. For this reason, when the air outside the case 10 is extremely low in temperature, heat is radiated from the fixed contacts 40a, 40b, 40c through the terminals 90a and 90b to the air outside the case 10. Therefore, the temperatures of the fixed contacts 40a, 40b, 40c become low temperatures close to the temperature of the air outside the case 10.
[0050] In this state, when the core wire 36a of the electromagnetic coil 31 is not energized, the coating 36b of the electromagnetic coil 31 contains water. That is, the coating 36b of the electromagnetic coil 31 is in a moist state. Subsequently, when energization is started on the core wire 36a of the electromagnetic coil 31, the core wire 36a of the electromagnetic coil 31 heats up due to the energization. As a result, the water contained in the coating 36b evaporates due to the heat generated from the core wire 36a, and water vapor is generated from the coating 36b. In addition, water, ice, etc. attached to the coating 36b of the electromagnetic coil 31 evaporates due to the heat supplied from the core wire 36a, and water vapor is generated.
[0051] Therefore, in the electromagnetic relay 1, if the isolation wall 70 and the heat dissipation section 80 are not provided, water vapor generated by the energization of the electromagnetic coil 31 may flow into the fixed contacts 40a, 40b, and 40c, and the water vapor may adhere to the fixed contacts 40a, 40b, and 40c. In this case, the water vapor dissipates heat to the fixed contacts 40a, 40b, and 40c, and condensed water adheres to the fixed contacts 40a, 40b, and 40c. As a result, condensed water may cause water to form between the fixed contacts 40a, 40b, and 40c and the movable contacts 51a, 51b, and 51c, potentially leading to poor contact.
[0052] In contrast, the electromagnetic relay 1 of this embodiment is provided with the aforementioned isolation wall 70 and heat dissipation section 80. Therefore, when the electromagnetic coil 31 is energized, the water vapor generated from the electromagnetic coil 31 rises due to convection. This rising water vapor is guided to the heat dissipation section 80 by the guide surface 71 of the isolation wall 70, as indicated by the arrow SZ. In other words, the water vapor is guided to the opposite side of the inner case 12X and the switch 55 (i.e., the upper side of the vertical direction Ya). After that, when the water vapor comes into contact with the heat dissipation section 80, it dissipates heat to the heat dissipation section 80. Therefore, the heat dissipated to the heat dissipation section 80 is dissipated to the outside of the case 10 through the flesh portion 11c of the cover portion 11. As a result, the water vapor condenses and condensed water adheres to the heat dissipation section 80. Consequently, this prevents water vapor from flowing from the electromagnetic coil 31 to the switch 55.
[0053] According to the embodiment described above, the electromagnetic relay 1 comprises a case 10 forming a storage chamber 10a, fixed contacts 40a, 40b, 40c, and movable contacts 51a, 51b, 51c. The fixed contacts 40a, 40b, 40c are each made of a conductive metal material and are housed in the storage chamber 10a while exposed to the air within the storage chamber 10a. The movable contacts 51a, 51b, 51c are also made of a conductive metal material and are housed in the storage chamber 10a while exposed to the air within the storage chamber 10a. The movable contacts 51a, 51b, 51c are configured to be able to contact the fixed contacts 40a, 40b, 40c or move away from the fixed contacts 40a, 40b, 40c by displacement.
[0054] The electromagnetic relay 1 is made of a conductive metal material such as copper and has terminals 90a and 90b exposed on the outside of the case 10. Electrical conduction occurs between terminals 90a and 90b when the movable contacts 51a, 51b, and 51c each make contact with the corresponding fixed contacts among the fixed contacts 40a, 40b, and 40c. Non-conductivity occurs between terminals 90a and 90b when the movable contacts 51a, 51b, and 51c move away from the fixed contacts 40a, 40b, and 40c. The electromagnetic relay 1 is housed in a storage chamber 10a and is made by winding an electric wire 36 around it, and has an electromagnetic coil 31 that generates a magnetic force that displaces the movable contacts 51a, 51b, and 51c when the electric wire 36 is energized. The electric wire 36 has a conductive core wire 36a made of a conductive metal material such as copper and a covering portion 36b made of an electrically insulating resin material that covers the core wire 36a.
[0055] Here, when the core wire 36a is energized and heat is generated, the water contained in the covering portion 36b evaporates due to the heat generated from the core wire 36a, and water vapor is generated from the covering portion 36b. In contrast, in this embodiment, the isolation wall 70 guides the water vapor to the opposite side of the inner case 12X and the switch 55 (i.e., the upper side of the vertical direction Ya), thereby preventing water vapor from flowing to the switch 55. As a result, it is possible to prevent condensed water from adhering to the fixed contacts 40a, 40b, and 40c. Thus, it is possible to prevent contact failure between the fixed contacts 40a, 40b, and 40c and the movable contacts 51a, 51b, and 51c.
[0056] In this embodiment, which is configured as described above, the following effects (a), (b), (c), (d), (e), and (f) can be obtained. (a) The heat dissipation section 80 is made of a metal material with higher thermal conductivity than the case 10, promoting the dissipation of heat from water vapor to the outside of the case 10. The isolation wall 70 prevents water vapor from flowing to the switch 55 side by guiding the water vapor generated from the covering section 36b due to the heat generated by the electric wire 36 to the heat dissipation section 80. Therefore, the water vapor can be condensed by the heat dissipation section 80 to generate condensed water. As a result, by reducing the water vapor in the storage chamber 10a, it is possible to prevent condensed water from adhering to the fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c.
[0057] (b) The heat dissipation section 80 is positioned above the switch 55 in the vertical direction Ya. This further suppresses the flow of water vapor generated from the covering section 36b due to the heat generated by the electric wire 36 to the switch 55. (c) The isolation wall 70 is positioned horizontally offset from the electromagnetic coil 31 and is located between the heat dissipation section 80 and the switch 55. This further suppresses the flow of water vapor generated from the covering section 36b to the switch 55.
[0058] (d) The isolation wall 70 is formed to cover the switch 55 from above in the vertical direction Ya. Therefore, it is possible to further suppress the flow of water vapor generated from the covering portion 36b to the switch 55. (e) The isolation wall 70 is formed to move closer to the heat dissipation portion 80 as it moves away from the electromagnetic coil 31, and is equipped with a guide surface 71 that guides water vapor generated from the electromagnetic coil 31 to the heat dissipation portion 80. Therefore, water vapor generated from the covering portion 36b due to the heat generated by the core wire 36a of the electric wire 36 can be smoothly guided to the heat dissipation portion 80. (f) The heat dissipation portion 80 is located on the ceiling surface 11b that forms the storage chamber 10a of the case 10, and is formed to follow the ceiling surface 11b. Therefore, the heat dissipation portion 80 dissipates the heat absorbed from the water vapor to the outside of the case 10 through the flesh portion 11c of the cover portion 11. Therefore, the heat absorbed from the water vapor can be smoothly dissipated to the outside of the case 10.
[0059] (Second Embodiment) In the first embodiment described above, an example was described in which the heat dissipation section 80 of the electromagnetic relay 1 was located inside the case 10. However, instead, this second embodiment, in which the heat dissipation section 80 of the electromagnetic relay 1 is located on the outer wall 11d of the case 10, will be described with reference to Figure 7. Figure 7 is a magnified view of the area around the heat dissipation section 80 of the electromagnetic relay 1 of this embodiment. This second embodiment and the first embodiment described above differ only in the position of the heat dissipation section 80; the other configurations are the same. Therefore, the position of the heat dissipation section 80 will be described below.
[0060] The heat dissipation section 80 is formed in a film-like shape with the vertical direction Ya as the thickness direction and extending in the axial direction Yb and the depth direction Yc. The heat dissipation section 80 is positioned along the outer wall 11d of the cover section 11. The outer wall 11d is a wall formed on the outside of the case 10 within the cover section 11. The outer wall 11d is formed on the upper side of the cover section 11 in the vertical direction Ya. The heat dissipation section 80 is fixed to the outer wall 11d of the case 10 by adhesive or the like. The heat dissipation section 80 is positioned on the outside of the case 10 and on the upper side of the vertical direction Ya relative to the isolation wall 70. The isolation wall 70 is positioned between the heat dissipation section 80 and the switch 55.
[0061] In this embodiment, when current is supplied to the electromagnetic coil 31, the water vapor generated from the covering portion 36b of the electromagnetic coil 31 due to the heat generated by the electromagnetic coil 31 rises due to convection. This rising water vapor is guided towards the heat dissipation portion 80 by the guide surface 71 of the isolation wall 70. Subsequently, when the water vapor touches the ceiling surface 11b of the cover portion 11, the water vapor dissipates heat to the cover portion 11. This heat dissipated to the cover portion 11 is then dissipated to the air outside the case 10 through the flesh portion 11c of the cover portion 11 and the heat dissipation portion 80. As a result, the water vapor condenses and condensed water adheres to the ceiling surface 11b of the cover portion 11.
[0062] According to the embodiment described above, the isolation wall 70 guides the water vapor generated from the insulation portion 36b of the electric wire 36 due to the heat generated by the electric wire 36 to the heat dissipation portion 80. Subsequently, when the water vapor comes into contact with the ceiling surface 11b of the cover portion 11, the water vapor dissipates heat to the air outside the case 10 through the flesh portion 11c of the cover portion 11 and the heat dissipation portion 80. Therefore, it is possible to suppress the flow of water vapor to the switch 55 (i.e., the fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c). Consequently, it is possible to prevent condensation from adhering to the fixed contacts 40a, 40b, 40c.
[0063] (Third Embodiment) In the second embodiment described above, an example was described in which the heat dissipation section 80 of the electromagnetic relay 1 is arranged along the outer wall 11d of the cover section 11. In addition to this, the third embodiment, in which a plurality of through holes 120 are provided in the cover section 11 to improve the heat dissipation performance of the heat dissipation section 80, will be described with reference to Figure 8.
[0064] Figure 8 is a magnified view of the upper periphery of the cover portion 11 of the electromagnetic relay 1 of this embodiment. The electromagnetic relay 1 of this embodiment is configured such that, in the electromagnetic relay 1 of the second embodiment described above, a plurality of through holes 120 are provided on the upper side of the cover portion 11 in the vertical direction Ya. In the electromagnetic relay 1, the configuration of the cover portion 11 is the same as that of the electromagnetic relay 1 other than the plurality of through holes 120. Therefore, the plurality of through holes 120 will be mainly described below.
[0065] As shown in Figure 8, the multiple through-holes 120 are case through-holes, each having an inner opening 121 that opens into the ceiling surface 11b and an outer opening 122 that opens into the outer wall 11d. Each of the multiple through-holes 120 connects the inner opening 121 and the outer opening 122. Each of the multiple through-holes 120 is positioned above the guide surface 71 in the vertical direction Ya. The heat dissipation section 80 is positioned to close each of the outer openings 122 of the multiple through-holes 120.
[0066] In this embodiment, when current is supplied to the electromagnetic coil 31, the water vapor generated from the covering portion 36b of the electromagnetic coil 31 due to the heat generated by the electromagnetic coil 31 rises due to convection. This rising water vapor is guided towards the heat dissipation portion 80 by the guide surface 71 of the isolation wall 70. Subsequently, the water vapor reaches the heat dissipation portion 80 through the multiple through holes 120 of the cover portion 11. The water vapor dissipates heat to the air outside the case 10 through the heat dissipation portion 80. As a result, the water vapor condenses and condensed water adheres to the heat dissipation portion 80.
[0067] According to the embodiment described above, the cover portion 11 is provided with a plurality of through holes 120. Each of the plurality of through holes 120 has an inner opening 121 that opens into the ceiling surface 11b and an outer opening 122 that opens into the outer wall 11d. Each of the plurality of through holes 120 connects the inner opening 121 and the outer opening 122. The heat dissipation portion 80 is positioned to close each of the outer openings 122 of the plurality of through holes 120.
[0068] Therefore, the water vapor guided to the heat dissipation section 80 by the guide surface 71 of the isolation wall 70 reaches the heat dissipation section 80 through the multiple through holes 120. The water vapor dissipates heat to the air outside the case 10 through the heat dissipation section 80. As a result, the water vapor condenses and condensed water adheres to the heat dissipation section 80. This allows the water vapor to efficiently dissipate heat to the air outside the case 10. Consequently, the flow of water vapor to the switch 55 (i.e., the fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c) can be further suppressed. This effectively suppresses the adhesion of condensed water to the fixed contacts 40a, 40b, 40c.
[0069] (Fourth Embodiment) In the third embodiment described above, an example was described in which the heat dissipation section 80 of the electromagnetic relay 1 is arranged to close each of the outer openings 122 of the multiple through holes 120 of the cover section 11. However, in addition to this, the heat dissipation section 80 of the electromagnetic relay 1 is provided with multiple through holes 130 for discharging water vapor from the multiple through holes 120 to the outside of the case 10, and this fourth embodiment will be described with reference to Figure 9.
[0070] Figure 9 is a magnified view of the area around the heat dissipation section 80 of the electromagnetic relay 1 of this embodiment. The electromagnetic relay 1 of this embodiment has a configuration in which a plurality of through holes 130 are added to the heat dissipation section 80 compared to the electromagnetic relay 1 of the third embodiment described above. In the electromagnetic relay 1, the configuration other than the plurality of through holes 130 of the heat dissipation section 80 is the same. Therefore, the plurality of through holes 130 will be described below in detail.
[0071] As shown in Figure 9, each of the multiple through holes 130 is provided with a heat dissipation opening 131 and a heat dissipation opening 132. The heat dissipation opening 131 is a first heat dissipation opening of the heat dissipation section 80 that communicates with the outer opening 122 of the case 10. The heat dissipation opening 132 is a second heat dissipation opening of the heat dissipation section 80 that opens to the outside of the case 10. Each of the multiple through holes 130 is a heat dissipation through hole that connects the heat dissipation opening 132 and the heat dissipation opening 131.
[0072] In this embodiment, when current is supplied to the electromagnetic coil 31, the water vapor generated from the covering portion 36b of the electromagnetic coil 31 due to the heat generated by the electromagnetic coil 31 rises due to convection. This rising water vapor is guided towards the heat dissipation portion 80 by the guide surface 71 of the isolation wall 70. Subsequently, the water vapor is released to the outside of the case 10 through the multiple through holes 120 and multiple through holes 130 of the cover portion 11.
[0073] According to the embodiment described above, in the electromagnetic relay 1, the heat dissipation section 80 is provided with a plurality of through holes 130. Each of the plurality of through holes 130 has a heat dissipation opening 131 that communicates with the outer opening 122 of the through hole 120 and a heat dissipation opening 132 that opens to the outside of the case 10. Each of the plurality of through holes 130 connects the heat dissipation opening 131 and the heat dissipation opening 132. Water vapor generated from the covering portion 36b of the electromagnetic coil 31 is guided to the heat dissipation section 80 by the guide surface 71 of the isolation wall 70. The water vapor is released to the outside of the case 10 through the plurality of through holes 120 and the plurality of through holes 130 of the cover portion 11. Therefore, the flow of water vapor to the switch 55, i.e., the fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c can be further suppressed. Therefore, it is possible to effectively suppress the adhesion of condensed water to the fixed contacts 40a, 40b, and 40c.
[0074] (Fifth Embodiment) In the third embodiment described above, an example was described in which the heat dissipation section 80 of the electromagnetic relay 1 is arranged to close each of the outer openings 122 of the multiple through holes 120 of the cover section 11. However, instead, an example will be described with reference to Figure 10 in which the heat dissipation section 80 of the electromagnetic relay 1 is arranged to close each of the inner openings 121 of the multiple through holes 120 of the cover section 11.
[0075] Figure 10 is a magnified view of the area around the heat dissipation section 80 of the electromagnetic relay 1 of this embodiment. In the electromagnetic relay 1 of this embodiment, the heat dissipation section 80 is arranged to follow the ceiling surface 11b of the cover section 11, compared to the electromagnetic relay 1 of the third embodiment described above. As a result, the heat dissipation section 80 is positioned to close each of the inner openings 121 of the multiple through holes 120 of the cover section 11. In the electromagnetic relay 1 of this embodiment, the configuration other than the heat dissipation section 80 is the same as that of the electromagnetic relay 1 of the third embodiment described above. Therefore, the heat dissipation section 80 of the electromagnetic relay 1 of this embodiment will be described below in detail.
[0076] The heat dissipation section 80 is positioned within the storage chamber 10a so as to block the inner openings 121 of each of the multiple through holes 120. The heat dissipation section 80 is positioned above the guide surface 71 in the vertical direction Ya. In this embodiment, when current is supplied to the electromagnetic coil 31, the water vapor generated from the covering portion 36b of the electromagnetic coil 31 due to the heat generated by the electromagnetic coil 31 rises due to convection. This rising water vapor is guided towards the heat dissipation section 80 by the guide surface 71 of the isolation wall 70. Subsequently, the water vapor reaches the heat dissipation section 80. The water vapor dissipates heat to the heat dissipation section 80. The heat dissipated to the heat dissipation section 80 is then dissipated to the air outside the case 10 through the multiple through holes 120. As a result, the water vapor condenses and condensed water adheres to the heat dissipation section 80.
[0077] As described above, according to this embodiment, the heat dissipation section 80 is positioned on the ceiling surface 11b of the cover section 11. The heat dissipation section 80 is positioned to close each of the inner openings 121 of the multiple through holes 120 of the cover section 11. Therefore, when water vapor guided to the heat dissipation section 80 by the guide surface 71 of the isolation wall 70 reaches the heat dissipation section 80, the water vapor dissipates heat to the air outside the case 10 through the heat dissipation section 80 and the multiple through holes 120. As a result, the water vapor can be efficiently dissipated to the air outside the case 10. This further suppresses the flow of water vapor to the switch 55 (i.e., the fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c). Therefore, the adhesion of condensed water to the fixed contacts 40a, 40b, 40c can be efficiently suppressed.
[0078] (Sixth Embodiment) In the fourth embodiment described above, an example was described in which the heat dissipation section 80 of the electromagnetic relay 1 is located on the outer wall 11d of the case 10. However, instead, this sixth embodiment, in which the heat dissipation section 80 is located on the ceiling surface 11b (i.e., the inner wall) of the case 10, will be described with reference to Figure 11.
[0079] Figure 11 is a magnified view of the area around the heat dissipation section 80 of the electromagnetic relay 1 of this embodiment. In the electromagnetic relay 1 of this embodiment, the heat dissipation section 80 is formed to follow the ceiling surface 11b of the cover section 11, as in the electromagnetic relay 1 of the fourth embodiment described above. In the electromagnetic relay 1 of this embodiment, all other configurations except for the position of the heat dissipation section 80 are the same as those of the electromagnetic relay 1 of the fourth embodiment described above. Therefore, the heat dissipation section 80 will be described below in detail.
[0080] As shown in Figure 11, the heat dissipation section 80 is provided with a plurality of through holes 130. Each of the plurality of through holes 130 has a heat dissipation opening 131 and a heat dissipation opening 132. The heat dissipation opening 131 is a second heat dissipation opening of the heat dissipation section 80 that opens into the housing chamber 10a of the case 10. Each of the heat dissipation openings 132 is a first heat dissipation opening that communicates with the inner opening 121 of the corresponding through hole 120 among the plurality of through holes 120. Each of the plurality of through holes 130 is a heat dissipation through hole that connects the heat dissipation opening 131 and the heat dissipation opening 132.
[0081] In this embodiment, when current is supplied to the electromagnetic coil 31, the water vapor generated from the insulation portion 36b of the electric wire 36 of the electromagnetic coil 31 rises due to convection as the electromagnetic coil 31 heats up. This rising water vapor is guided towards the heat dissipation portion 80 by the guide surface 71 of the isolation wall 70. Subsequently, the water vapor is released to the outside of the case 10 through the multiple through holes 130 of the heat dissipation portion 80 and the multiple through holes 120 of the cover portion 11.
[0082] According to the embodiment described above, in the electromagnetic relay 1, the heat dissipation section 80 is provided with a plurality of through holes 130. Each of the plurality of through holes 130 has a heat dissipation opening 132 that communicates with the inner opening 121 of the through hole 120, and a heat dissipation opening 131 that opens into the housing chamber 10a of the case 10. Each of the plurality of through holes 130 communicates the heat dissipation opening 131 and the heat dissipation opening 132. Water vapor guided to the heat dissipation section 80 side by the guide surface 71 of the isolation wall 70 is released to the outside of the case 10 through the plurality of through holes 130 of the heat dissipation section 80 and the plurality of through holes 120 of the cover section 11. Therefore, the flow of water vapor to the switch 55, i.e., the fixed contacts 40a, 40b, 40c and the movable contacts 51a, 51b, 51c can be further suppressed. Therefore, the adhesion of condensed water to the fixed contacts 40a, 40b, 40c can be efficiently suppressed.
[0083] (Other Embodiments) (a) In the first embodiment described above, an example was described in which the heat dissipation part 80 of the electromagnetic relay 1 is fixed to the cover part 11 with an adhesive. However, instead, an integrated component may be constructed in which the heat dissipation part 80 and the cover part 11 are integrated by injection molding. Similarly, in the second to sixth embodiments described above, an integrated component may be constructed in which the heat dissipation part 80 and the cover part 11 are integrated by injection molding.
[0084] (b) In the above embodiment, the electromagnetic relay 1 is mounted on an automobile, but the mounting location of the electromagnetic relay 1 is not limited to automobiles, but may be any aircraft, ship, drone, building, etc.
[0085] (c) This disclosure is not limited to the embodiments described above and can be modified as appropriate. Furthermore, the embodiments described above are not unrelated to each other and can be combined as appropriate, except in cases where the combination is clearly impossible. In addition, it goes without saying that the elements constituting the embodiments in each embodiment are not necessarily essential, except in cases where they are explicitly stated to be particularly essential or where they are clearly considered essential in principle. Furthermore, in each embodiment, when numerical values such as the number, numerical values, quantities, or ranges of the components of the embodiment are mentioned, they are not limited to those specific numbers, except in cases where they are explicitly stated to be particularly essential or where they are clearly limited to a specific number in principle. Furthermore, when the shapes, positional relationships, etc. of the components, etc. are mentioned in each embodiment, they are not limited to those shapes, positional relationships, etc., except in cases where they are explicitly stated to be particular or where they are clearly limited to a specific shape, positional relationship, etc.
Claims
1. An electromagnetic relay comprising: a case (10) forming a storage chamber (10a); first terminals and second terminals (90a, 90b) made of a conductive material and exposed to the outside of the case; fixed contacts (40a, 40b, 40c) made of a conductive material and housed in the storage chamber exposed to the air inside the storage chamber; movable contacts (51a, 51b, 51c) made of a conductive material and housed in the storage chamber exposed to the air inside the storage chamber, and configured to be able to contact or separate from the fixed contacts by displacement, wherein the movable contacts make contact with the fixed contacts, thereby creating conductivity between the first and second terminals, and the movable contacts separate from the fixed contacts, thereby creating non-conductivity between the first and second terminals; and an electromagnetic coil (31) housed in the storage chamber and generating a magnetic force that displaces the movable contacts when energized. An electromagnetic relay comprising: an isolation wall (70) that prevents water vapor generated by the heat of the electromagnetic coil due to the energization from flowing to the switch side.
2. The electromagnetic relay according to claim 1, wherein the electromagnetic coil is composed of a wire (36) comprising a conductive core wire (36a) formed of a conductive material and an insulating part (36b) covering the core wire, and when the core wire heats up due to the energization of the core wire, the water contained in the insulating part evaporates due to the heat generated from the core wire and generates water vapor.
3. The electromagnetic relay according to claim 1, comprising a heat dissipation section (80) disposed in the case and made of a material having higher thermal conductivity than the case, which promotes the dissipation of the water vapor to the outside of the case, wherein the isolation wall prevents the water vapor generated from the electromagnetic coil from flowing to the switch side by guiding it toward the heat dissipation section.
4. The electromagnetic relay according to claim 3, wherein, when the electromagnetic relay is mounted on the mounting site, the heat dissipation section is positioned above the isolation wall.
5. The electromagnetic relay according to claim 4, wherein, when the electromagnetic relay is mounted on the mounting site, the isolation wall is positioned horizontally offset from the electromagnetic coil and positioned between the heat dissipation section and the switch.
6. The electromagnetic relay according to claim 5, wherein, when the electromagnetic relay is mounted on the mounting site, the isolation wall is formed to cover the switch from above.
7. The electromagnetic relay according to claim 5 or 6, wherein the isolation wall is formed to move closer to the heat dissipation section as it moves away from the electromagnetic coil, and includes a guide surface (71) for guiding the water vapor generated from the electromagnetic coil to the heat dissipation section.
8. The electromagnetic relay according to claim 3, wherein the heat dissipation section is arranged on the inner wall (11b) of the case that forms the storage chamber.
9. The case is provided with a case through-hole (120) having an inner opening (121) that opens into the inner wall and an outer opening (122) that opens into the outer wall (11d) of the case, and the heat dissipation part is arranged to close the inner opening, as described in claim 8.
10. The electromagnetic relay according to claim 8, wherein the case is provided with a case through-hole (120) having an inner opening (121) that opens into the inner wall and an outer opening (122) that opens into the outer wall (11d) of the case, and the case through-hole (120) that connects the inner opening and the outer opening, and the heat dissipation section is provided with a heat dissipation through-hole (130) having a first heat dissipation opening (132) that communicates with the inner opening and a second heat dissipation opening (131) that opens into the storage chamber of the case, and the heat dissipation through-hole (130) that connects the first heat dissipation opening and the second heat dissipation opening.
11. The electromagnetic relay according to claim 3, wherein the heat dissipation section is located on the outer wall (11d) of the case.
12. The electromagnetic relay according to claim 11, wherein the case is provided with a case through-hole (120) having an inner opening (121) that opens into the inner wall (11b) of the case and an outer opening (122) that opens into the outer wall, and the heat dissipation part is arranged to close the outer opening of the case through-hole.
13. The electromagnetic relay according to claim 11, wherein the case is provided with a case through-hole (120) having an inner opening (121) that opens into the inner wall (11b) of the case and an outer opening (122) that opens into the outer wall, and the heat dissipation section is provided with a heat dissipation through-hole (130) having a first heat dissipation opening (131) that communicates with the outer opening and a second heat dissipation opening (132) that opens to the outside of the case, and the first heat dissipation opening and the second heat dissipation opening communicate.