Electromagnetic relay

Abstract

Electromagnetic relay (100), comprising: a fixed connection (14c, 15c), including a first surface (14a, 15a), a second surface (14b, 15b) arranged opposite the first surface (14a, 15a), and a fixed contact (14c, 15c) arranged on the first surface (14a, 15a); a movable contact piece (16) that includes a movable contact (16a, 16b) configured to touch the fixed contact (14c, 15c); a housing enclosing a receiving area (2c) in which a section of the fixed connector (14c, 15c), the fixed contact (14c, 15c) and the movable contact piece (16) are housed; a heat dissipation structure (6) which includes a heat dissipation area (6a, 6c) provided on the side of the second surface (14b, 15b) of the fixed connection (14c, 15c) to dissipate the heat from the fixed connection (14c, 15c) to an outside of the receiving area (2c); a contact housing (11) that defines the receiving area (2c) and the heat dissipation area (6a, 6c) and carries the fixed connection (14c, 15c); a drive shaft (4) which is movable with the movable contact piece (16) in a first direction (Z1) in which the movable contact piece (16) touches the fixed contact (14c, 15c), and in a second direction (Z2) in which the movable contact (16) separates from the fixed contact (14c, 15c), and an electromagnetic drive device (5) which moves the drive shaft (4) in the first and second directions (Z1, Z2), wherein the heat dissipation area (6a, 6c) is located adjacent to the receiving area (2c), the contact housing (11) includes a base (11a) and a contact carrier section (11e) which is arranged on the side of the second direction (Z1) of the base (11) to support the fixed terminal (14c, 15c); the fixed connection (14c, 15c) on the second surface (14b, 15b) is supported by the contact carrier section (11e) of the contact housing (11), and the heat dissipation area (6a, 6c) is arranged on the side of the first direction (Z1) of the contact carrier section (11e), the electromagnetic drive device (5) includes a yoke (37a) which is arranged on the side of the first direction (Z1) of the heat dissipation area (6a, 6c), and the heat dissipation area (6a, 6c) is surrounded by the contact carrier section (11e) of the contact housing (11) and the yoke (37a).

Description

TECHNICAL AREA

[0001] This invention relates to an electromagnetic relay. STATE OF THE ART

[0002] Relays, which open and close an electrical circuit, are commonly known. The electromagnetic relay described in JP 6 300 153 B2 has a fixed terminal, including a fixed contact, a movable contact, including a movable contact, a drive shaft, and an electromagnetic actuator, including a coil. The movable contact is connected to the drive shaft so that it is fixedly connected to it and movable. Actuation of the electromechanical actuator causes the movable contact to move with the drive shaft, and the fixed contact touches or separates from the movable contact, thus closing or opening the electrical circuit.

[0003] While the fixed contact is in contact with the movable contact, i.e., during excitation, the components, including the fixed terminal, the movable contact, and the coil of the electromagnetic drive device, generate heat. To effectively dissipate the heat generated by the coil of the electromagnetic drive device to the housing during excitation, patent document 1 discloses a configuration in which a switching element, having a higher thermal conductivity than air, is placed in the gap between the electromagnetic drive device and the housing in which the electromagnetic drive device is located.

[0004] According to US 2015 / 0380193A1, an electromagnetic contactor readily extinguishes an arc that occurs when a moving contact separates from a fixed contact. The moving contact is arranged so that it can be connected to and disconnected from the pair of fixed contacts. The two fixed contacts are arranged in an insulating contact housing at a predetermined distance. An arc-quenching chamber is formed at the point of contact between the moving contact and the pair of fixed contacts. At least the inner wall of the arc-quenching chamber, which is in contact with the arc, is made of a highly thermally conductive material whose thermal conductivity is higher than that of a resin molding material.

[0005] According to JP S49-24965 U, an electromagnetic contactor is described, consisting of a movable frame with an opening window at one end and a movable iron core attached to the other end, housed in a casing such that it is movable in both directions. The movable frame is pushed toward one end by a return spring so that the magnetic pole face of the movable iron core faces the magnetic pole face of a fixed iron core around which a coil is wound. A movable contact plate with movable contacts attached to both end faces projects through the opening window at its center, and a contact spring presses the movable contact plate against an end face inside the opening window. Terminal plates with fixed contacts attached to their end faces are mounted on the casing at right angles to both ends of the movable frame.Ventilation channels are formed on the back side of the connection plates. When the movable contact and the fixed contact are closed, both ventilation channels are connected to each other via the opening window.

[0006] According to US 8,461,950 B2, an electromagnetic switching device comprises a housing; fixed contacts arranged within the housing; a movable contact that engages and disengages from the fixed contacts; and a drive unit on one side of the housing that drives the movable contact. The fixed contacts are arranged perpendicular to the direction of movement of the movable contact. This reduces noise and minimizes the size.

[0007] According to JP 2012-199095A, a contact device is provided that is capable of preventing the adverse effects of an arc discharge due to heat. The device comprises a contact part 3 in which a movable contact 31 comes into contact with and separates from a fixed contact 35 upon excitation; a drive part 2 that drives the movable contact 31 to come into contact with and separate from the fixed contact 35; a housing 5 in which the housing 5 is located. In this structure, a heat dissipation element 45 is provided around the contact part 3 along the contact / separation direction of the movable contact 31 and the fixed contact 35. SUMMARY<Technische Aufgabe>

[0008] According to JP 6 300 153 B2, although the heat generated in the coil of the electromagnetic drive device during excitation can be effectively dissipated to the housing, it is difficult to effectively dissipate the heat generated in the fixed terminal and the movable contact piece during excitation.

[0009] The object of the invention is to provide an electromagnetic relay that is able to effectively dissipate the heat generated in the fixed terminal and in the movable contact piece during excitation. <Lösung der Aufgabe>

[0010] The stated problem is solved by the features of the main claim. Advantageous embodiments are described in the dependent claims. An electromagnetic relay of this invention includes a first fixed terminal, a movable contact, a housing, and a heat dissipation structure. The fixed terminal includes a first surface, a second surface arranged opposite the first surface, and a fixed contact arranged on the first surface. The movable contact includes a movable contact configured to make contact with the fixed contact. The housing includes a receiving area in which a portion of the fixed terminal, the fixed contact, and the movable contact are accommodated.The heat dissipation structure includes a heat dissipation area provided on the side of the second surface of the fixed connection to dissipate heat from the fixed connection to an outside of the receiving area.

[0011] Since the heat dissipation area for dissipating heat from the fixed terminal is arranged on the side of the second surface of the fixed terminal, the heat generated in the fixed terminal during excitation can be effectively dissipated from the side of the second surface of the fixed terminal to the outside of the receiving area in this electromagnetic relay. Furthermore, the heat from the moving contact can be effectively dissipated outside the receiving area through the fixed terminal.

[0012] Preferably, the heat dissipation structure also includes a heat conduction element located in the heat dissipation area, which has a higher thermal conductivity than air. In this case, the heat conduction element enables the heat generated in the fixed connection during excitation to be dissipated more effectively from the side of the second surface of the fixed connection to the outside of the receiving area.

[0013] The heat conduction element is preferably arranged in contact with at least either the receptacle and / or the fixed connection. Since the heat conduction element is arranged in contact with at least either the receptacle and / or the fixed connection, the heat generated in the fixed connection during excitation can also be effectively dissipated outside the receptacle area in this case.

[0014] Preferably, the heat dissipation structure also includes a vent that connects the heat dissipation area to the outside of the receptacle. In this case, the heat generated in the fixed connection during excitation can be more effectively dissipated from the heat dissipation area to the outside of the receptacle.

[0015] The electromagnetic relay also includes a contact housing, which defines the receiving area and the heat dissipation area, carries the fixed connection, and is located adjacent to the receiving area. In this case, the heat generated in the fixed connection can be more effectively dissipated from the heat dissipation area through the contact housing.

[0016] The electromagnetic relay also includes a drive shaft and an electromagnetic actuator. The drive shaft is movable with the movable contact in a first direction, in which the movable contact engages the fixed contact, and in a second direction, in which the movable contact disengages from the fixed contact. The electromagnetic actuator moves the drive shaft in both directions. The contact housing includes a base and a contact carrier section, which is located on the side of the base corresponding to the second direction of movement to support the fixed contact. The second surface of the fixed contact is supported by the contact carrier section of the contact housing. The heat dissipation area is located on the side of the contact carrier section corresponding to the first direction of movement.In this case, the area on the side of the first direction of the contact carrier section can be effectively used as a heat dissipation area due to the contact carrier section.

[0017] The electromagnetic drive device includes a yoke located on the side of the first direction of the heat dissipation area, and the heat dissipation area is surrounded by the contact carrier section of the contact housing and the yoke. In this case, the heat generated in the fixed connection during excitation can be dissipated more effectively to the yoke. <Wirkungen der Erfindung>

[0018] According to the invention, it is possible to provide an electromagnetic relay that can effectively dissipate the heat generated in the fixed connection and movable contact piece. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a cross-sectional view of an electromagnetic relay according to an embodiment of this invention. Fig. Figure 2 shows a top view of a contact housing. Fig. Figure 3 shows an enlarged cross-sectional view illustrating the perimeter of the contact housing. Fig. Figure 4 shows a cross-sectional view of an electromagnetic relay when a voltage is applied to the coil. Fig. Figure 5 shows an enlarged cross-sectional view illustrating the perimeter of a contact housing according to a first embodiment. Fig. Figure 6 shows an enlarged cross-sectional view illustrating the perimeter of a contact housing according to a second design variant. Fig. Figure 7 shows a schematic side view of an electromagnetic relay according to a fourth design variant. Fig. Figure 8 shows a schematic side view of an electromagnetic relay according to a fourth design variant. DETAILED DESCRIPTION

[0019] In the following, an embodiment of an electromagnetic relay according to one aspect of this invention is described with reference to the drawings. Fig. Figure 1 shows a cross-sectional view of an electromagnetic relay 100. According to the illustration in Fig. Figure 1 of the electromagnetic relay 100 comprises a housing 2, a contact device 3, a drive shaft 4, an electromagnetic drive device 5, and a heat dissipation structure 6. In the following description, the direction in which the axis Ax of the drive shaft 4 extends is referred to as the "axial direction". For clarity, the upper side is referred to as the "axis direction" in the drawings. Fig. 1 is designated as "top", the bottom as "bottom", the left as "left", and the right as "right". In this embodiment, the downward direction corresponds to Fig. 1 of the contact direction Z1. The upward direction in Fig. 1 corresponds to the separation direction Z2 in Fig. 1. Detailed information on the contact direction Z1 and the separation direction Z2 will be described later.

[0020] The housing 2 encloses a container 2a and a lid 2b. The container 2a is an approximately rectangular box and is open at the top. The lid 2b covers the upper part of the container 2a. The housing 2 is sealed internally by the container 2a and the lid 2b. The container 2a and the lid 2b are made of insulating material. The contact device 3, the drive shaft 4, and the electromagnetic drive device 5 are housed in the receptacle 2.

[0021] The housing 2 includes a receiving area 2c for accommodating the contact device 3. In this embodiment, the receiving area 2c is enclosed by a contact housing 11 and a contact cover 12, both of which are arranged in the receiving area 2. The contact housing 11 and the contact cover 12 are made of insulating material.

[0022] Fig. Figure 2 shows a top view of the contact housing 11. According to the illustration in Fig. 1 and Fig. 2 The contact housing 11 includes a base 11a, a cylindrical part 11b, an inner wall 11c, and an outer wall 11d. The base 11a is rectangular and plate-shaped. The base 11a has a longitudinal direction that aligns with the left-right direction. Fig. 1 matches.

[0023] The cylindrical part 11b extends axially in a cylindrical shape. The cylindrical section 11b projects downwards from the center of the base 11a and upwards from the center of the base section 11a. The cylindrical part 11b has a through-hole 18 that penetrates axially into the base 11a. The through-hole 18 penetrates axially into the center of the base 11a. The drive shaft 4 passes axially through the through-hole 18.

[0024] The inner wall 11c is rectangular in plan view and extends upwards in a plate-like shape from the base 11a to surround the outer circumference of the cylindrical part 11b. The inner wall 11 extends upwards beyond the cylindrical part 11. A portion of a contact piece holder unit 17, described earlier, is housed within the area enclosed by the inner wall 11c.

[0025] The outer wall 11d is located at a position farther away from the cylindrical part 11b than the inner wall 11c. The outer wall 11d extends upwards from the base 11a in a plate-like form. The outer wall 11b has an approximately rectangular shape in plan view and extends upwards beyond the inner wall 11c.

[0026] The contact housing 11 also includes a first contact carrier section 11e and a second contact carrier section 11f. The first contact carrier section 11e is arranged longitudinally to the left of the center of the base 11a. The first contact carrier section 11e has a rectangular shape and extends upwards from the base 11a. The first contact carrier section 11e is configured to penetrate a section of the outer wall 11d in a left-right direction. The first contact carrier section 11e is arranged opposite the inner wall 11c in a left-right direction. The shape of the second contact carrier section 11f is symmetrical with the first contact carrier section 11e and is therefore omitted from the description.

[0027] The contact cover 12 covers the upper part of the contact housing 11. The contact cover 12 encloses an arc expansion wall 12a, which extends towards the bottom 11a along the outer wall 11d of the contact housing 11.

[0028] The contact device 3 includes a first fixed terminal 14, a second fixed terminal 15, a movable contact piece 16, and a contact piece holder unit 17. The first fixed terminal 14, the second fixed terminal 15, and the movable contact piece 16 are made of a conductive material.

[0029] The first fixed connection 14 is formed by bending a plate-shaped element. The first fixed connection 14 has one end that is housed in the mounting section 2c, while the other end protrudes from the receptacle 2 in a left-right direction and is exposed on the outside of the receptacle 2. The first fixed connection 14a is arranged on an upper part of the first contact carrier section 11e in the contact housing 11. The first fixed connection 14a is carried in contact with the first contact carrier section 11e of the contact housing 11 at its second surface 14b, which is described further below.

[0030] Fig. Figure 3 shows an enlarged cross-sectional view illustrating the perimeter of the contact housing 11. As shown in Fig. 3. The fixed connection 14 includes a first surface 14a, a second surface 14b, a first fixed contact 14c, and a first external connection 14d. The first surface 14a corresponds to the surface on the side of the separation direction Z2. The second surface 14b is located opposite the first surface 14a and corresponds to the surface on the side of the contact direction Z1. The second surface 14b is in contact with the first contact carrier section 11e of the contact housing 11. The contact is not necessarily a direct contact and can be a direct contact. The first fixed contact 14c is located on the first surface 14a in the receiving area 2c.

[0031] The second fixed terminal 15 is supported by the second contact carrier section 11f of the contact housing 11 in the receptacle 2. The second fixed terminal 15 includes a first surface 15a, a second surface 15b, a second fixed contact 15c, and a second external connection 15d. The shape of the second fixed terminal 15 is symmetrical with the first fixed terminal 14 and is therefore omitted from the description.

[0032] The movable contact piece 16 is arranged opposite the first fixed contact 14c and the second fixed contact 15c in the receiving area 2c. The movable contact piece 16 is arranged above the first fixed contact 14c and the second fixed contact 15c. The movable contact piece 16 includes a first movable contact 16a and a second movable contact 16b. The first movable contact 16a is arranged opposite the first fixed contact 14c and can come into contact with the first fixed contact 14c. The second movable contact 16b is arranged opposite the second fixed contact 15c and can come into contact with the second fixed contact 15c. It should be noted that Fig. 3 represents a state in which the first movable contact 16a and the second movable contact 16b are each in contact with the first fixed contact 14c and the second fixed contact 15c.

[0033] The movable contact piece 16 is movable in the contact direction Z1, in which it touches the first fixed contact 14c and the second fixed contact 15c, and in the separation direction Z2, in which it separates from the first fixed contact 14c and the second fixed contact 15c. The contact direction Z1 is an example of the first direction, and the separation direction Z2 is an example of the second direction.

[0034] The contact direction Z1 is the direction in which the first movable contact 16a and the second movable contact 16b touch the first fixed contact 14c and the second fixed contact 15c (downwards in Fig. 1) The separation direction Z2 is the direction in which the first movable contact 16a and the second movable contact 16b separate from the first fixed contact 14c and the second fixed contact 15c (upwards in Fig. 1) The contact direction Z1 and the separation direction Z2 coincide with the axial direction.

[0035] According to the representation in Fig. The contact piece holder unit 17 holds the movable contact piece 16 by means of the drive shaft 4. The contact piece holder unit 17 connects the movable contact piece 16 to the drive shaft 4. The contact piece holder unit 17 includes a holder 24 and a contact spring 25. The movable contact piece 16 is held axially between the upper part of the holder 24 and the flange 4a of the drive shaft 4. The contact spring 25 is arranged between the base of the holder 24 and the flange 4a of the drive shaft 4 and pushes the drive shaft 4 and the movable contact piece 16 towards the side of the separation direction Z2.

[0036] The drive shaft 4 extends along the contact direction Z1 and the separation direction Z2. The drive shaft 4 is connected to the movable contact piece 16 by means of the contact piece holder unit 17. The drive shaft 4 is movable with the movable contact piece 16 in the contact direction Z1 and the separation direction Z2.

[0037] The electromagnetic drive device 5 moves the drive shaft 4 in the contact direction Z1 and the separation direction Z2 by electromagnetic force. The electromagnetic drive device 5 is arranged in a different area than the receiving area 2c in the receptacle 2. In this embodiment, the electromagnetic drive device 5 is arranged below the contact housing 11.

[0038] The electromagnetic drive device 5 includes a coil 32, a roller 33, a movable iron core 34, a fixed iron core 35, a preload element 36 and a yoke 37.

[0039] The coil 32 is mounted on the outer circumference of the roller 33. The roller 33 encloses a housing section 33a. The housing section 33a is located inside the roller 33. The housing section 33a is cylindrical and extends axially. In the axial direction, the housing section 33a overlaps the through-hole 18 in the cylindrical part 11b of the contact housing 11. The drive shaft 4 is partially located within the housing section 33a.

[0040] A movable iron core 34 is arranged within the housing part 33a. The movable iron core 34 has a cylindrical shape and is connected to the drive shaft 4, the drive shaft 4 penetrating through the center in the axial direction, so that the movable iron core 34 is rigidly connected to the drive shaft 4 and is movable. The movable iron core 34 is movable together with the drive shaft 4 in the axial direction. In this embodiment, the movable iron core 34 is guided in the axial direction by an annular iron core 38, which is arranged in the housing part 33a.

[0041] The fixed iron core 35 is arranged opposite the movable iron core 34 on the side of the contact direction Z1 of the movable iron core 34 in the housing part 33a. The fixed iron core 35 is fixed to the yoke 37.

[0042] The preload element 36, for example, is a coil spring and is arranged between the movable iron core 34 and the fixed iron core 35. The preload element 36 forces the movable iron core 34 towards the separation direction Z2. Therefore, the preload element 36 is arranged in a compressed state between the movable iron core 34 and the fixed iron core 35.

[0043] The yoke 37 includes a first yoke 37a and a second yoke 37b. The first yoke 37a is plate-shaped and is arranged between the base 11a of the contact housing 11 and the roller 33. The first yoke 37a is fixed to the base 11a of the contact housing 11 by a plurality of screw elements, which are not shown. The first yoke 37a overlaps the first contact carrier section 11a and the second contact carrier section 11f of the contact housing 11 in the axial direction. The first yoke 37a overlaps the lower section of the cylindrical part 11b in the left-right direction. The first yoke 37a is connected to the annular iron core 38. The second yoke 37b has an approximate U-shape, with its base located below the roller 33 and connected to the solid iron core 35. The second yoke 37b is connected to the first yoke 37a at the upper ends of its two side sections.

[0044] According to the representation in Fig. 3 The heat dissipation structure 6 includes a first heat dissipation area 6a and a first heat conduction element 6b. The first heat dissipation area 6a is a heat dissipation area for the first fixed terminal 14 outside the receiving area 2c and is located on the side of the second surface 14b of the first fixed terminal 14. In detail, the first heat dissipation area 6a is located on the side of the contact direction Z1 of the first contact carrier section 11e of the contact housing 11. The first heat dissipation area 6a is located on a section adjacent to the receiving area 2c and is defined separately from the receiving area 2c. In this embodiment, the receiving area 2c and the first heat dissipation area 6a are defined by the contact housing 11.The first heat dissipation area 6a is, for example, an approximately rectangular area formed on the side of the contact direction Z1 of the first contact carrier section 11e when the contact housing 11 is molded from plastic. The side of the contact direction Z1 of the first heat dissipation area 6a is covered by the first yoke 37a. Therefore, in this embodiment, the first heat dissipation area 6a is surrounded by the first contact carrier section 11a and by the first yoke 37a.

[0045] The first heat conduction element 6b is an element that has a higher thermal conductivity than air. In this embodiment, the first heat conduction element 6b is preferably a non-metal and consists of a material such as urethane, silicone, or epoxy resin. The first heat conduction element 6b is arranged in at least a portion of the first heat dissipation area 6a. In this embodiment, the first heat conduction element 6b has a rectangular shape and is arranged to fill the heat dissipation area 6a. The first heat conduction element 6b is in contact with at least either the first contact carrier section 11e and / or the first yoke 37a. In this embodiment, the first heat conduction element 6b is in contact with both the first contact carrier section 11e and the first yoke 37a. The first heat conduction element 6b can be composed of a metal.In this case, it is preferable to arrange an insulating element between the first heat conduction element 6b and the first yoke 37a, so that the first heat conduction element 6b and the first yoke 37a do not come into direct contact with each other.

[0046] The heat dissipation structure 6 also includes a second heat dissipation area 6c and a second heat conduction element 6d. The second heat dissipation area 6c is a region for dissipating heat from the second fixed connection 15 outside the receiving area 2c and is located on the side of the second surface 15b of the second fixed connection 15. The second heat conduction element 6d is arranged in at least a portion of the second heat dissipation area 6c. Since the second heat dissipation area 6c and the second heat conduction element 6d are symmetrical in shape with the first heat dissipation area 6a and the first heat conduction element 6b, their description is omitted.

[0047] The following describes the operation of the electromagnetic relay 100. Fig. Figure 1 shows a state in which no voltage is applied to coil 32. While no voltage is applied to coil 32, the biasing element 36 ensures that the movable iron core 34 does not move in the contact direction Z1. Thus, the first movable contact 16a and the second movable contact 16b are separated from the first fixed contact 14c and the second fixed contact 15c.

[0048] Fig. 3 and Fig. Figure 4 shows a state in which voltage is applied to the coil 32. When a voltage is applied to the coil 32 to excite it, the electromagnetic force of the coil 32 causes the movable iron core 34 to move in the contact direction Z1 against the elastic force of the preload element 36. With the movement of the movable iron core 34, the drive shaft 4 and the movable contact piece 16 move in the contact direction Z1, and the first movable contact 16a and the second movable contact 16b contact the first fixed contact 14c and the second fixed contact 15c.

[0049] When the supply of voltage to the coil 32 is stopped, the movable iron core 34 moves in the separation direction Z2 due to the elastic force of the preload element 36 and the first movable contact 16a and the second movable contact 16b enter a state in which they are separated from the first fixed contact 14c and the second fixed contact 15c.

[0050] In the electromagnetic relay 100 of this embodiment, the heat from the first fixed terminal 14, the second fixed terminal 15, and the movable contact 16 is effectively dissipated outside the receiving area 2c by the heat dissipation structure 6, while the first movable contact 16a and the second movable contact 16b are in contact with the first fixed contact 14c and the second fixed contact 15c, respectively, during excitation. In particular, the heat from the first fixed terminal 14 can be effectively dissipated outside the receiving area 2c by the first heat dissipation area 6a and the first heat conduction element 6b. Since the first heat conduction element 6b is arranged in contact with the first contact carrier section 11a and the first yoke 37a, the heat from the first fixed terminal 14 can also be effectively dissipated to the first yoke 37a during excitation.Furthermore, the heat from the movable contact piece 16 during excitation can be effectively dissipated outside the receiving area 2c via the fixed connection 14. It should be noted that the heat from the second fixed connection 15 during excitation can be dissipated outside the receiving area 2c via the second heat dissipation area 6c and the second heat conduction element 6d.

[0051] One embodiment of the electromagnetic relay according to one aspect of this invention has been described above. However, this invention is not limited to the embodiment described above, and various modifications are possible without departing from the concept of the invention. For example, the configuration of the electromagnetic drive device 5 can be changed. The shapes or arrangements of the receptacle 2, the contact housing 11, the contact cover 12, and the yoke 37 can be modified.

[0052] Fig. Figure 5 shows an enlarged cross-sectional view illustrating the perimeter of the contact housing 11 according to a first embodiment. The heat dissipation structure 6 of the first embodiment also includes the vent 40, which connects the first heat dissipation area 6a to the outside of the receptacle 2. The heat dissipation structure 6 of the first embodiment does not include the first heat conduction element 6b and the second heat conduction element 6d. The other configurations correspond to those of the embodiment described above.

[0053] The vent 40 is designed to penetrate the contact housing 11 and the container 2a of the receptacle 2 in a left-right direction. In this embodiment, the vent 40 is located in a position that overlaps the first heat dissipation area 6a in a left-right direction. The vent 40 allows the heat from the first fixed terminal 14 to be effectively dissipated through the first heat dissipation area 6a to the outside of the receptacle 2c. The vent 40 is located on the side of the second fixed terminal 15, thus connecting the second heat dissipation area 6c to the outside of the receptacle 2.

[0054] Fig. Figure 6 shows an enlarged cross-sectional view illustrating the perimeter of the contact housing 11 according to a second embodiment. The heat dissipation structure 6 of the second embodiment includes the first heat dissipation area 6a, the first heat conduction element 6b, and the vent 40. In this case, the first heat conduction element 6b and the vent 40 ensure that the heat from the first fixed connection 14 can be dissipated more effectively outside the receiving area 2c. The positions and shapes of the heat conduction elements 6b, 6d, and the vent 40 can be modified as required.

[0055] Fig. Figure 7 shows a schematic side view of an electromagnetic relay according to a fourth embodiment. The electromagnetic relay 200 according to the fourth embodiment is a general electromagnetic articulated relay. The electromagnetic relay 200 includes a housing 102, a contact device 103, an electromagnetic actuator 105, and a heat dissipation structure 106. Fig. Figure 8 shows a state in which a voltage is applied to the coil 132 of the electromagnetic drive device 105. The operation of the electromagnetic relay 200 is omitted, as it is constructed in the same way as conventional ones.

[0056] The housing 102 includes a base 102a, a container 102b, and a receiving area 102c. In the fourth embodiment, the receiving area 102c is surrounded by the base 102a and the container 102b.

[0057] The contact device 103 is housed in the receiving area 102c. The contact device 103 includes a fixed terminal 114 and a movable contact 116. The fixed terminal 114 is supported by the base 102a. The fixed terminal 114 includes a fixed contact 114a, which is located on the first surface 114a. A movable contact 116 is located opposite the fixed terminal 114 and is supported by the base 102a. The movable contact 116 is composed of a conductive and elastically deformable plate spring. The movable contact 116 includes a movable contact 116a, which is configured to make contact with the fixed contact 114c.

[0058] The electromagnetic drive device 105 includes a movable iron piece 105a, which is approximately L-shaped. The movable iron piece 105a is able to press a card 150 in the contact direction Z1, with the card 150 being rotatably supported on the base of the receptacle 102.

[0059] The heat dissipation structure 106 includes a heat dissipation area 106a and a heat conduction element 106b. The heat dissipation area 106a is located on the side of the second surface 114b opposite the first surface 114a of the fixed connection 114 and dissipates the heat from the fixed connection 114 outside the receiving area 102c. The heat dissipation area 106a is surrounded by the housing 102 on the side of the contact direction Z1. At least a portion of the heat dissipation area 106a on the side of the separation direction Z2 is surrounded by the second surface 114b of the fixed connection 114.

[0060] The heat dissipation element 106b is an element that has a higher thermal conductivity than air. The heat conduction element 106b is preferably a non-metal and consists of a material such as urethane, silicone, or epoxy resin. The heat conduction element 106b is arranged in at least a portion of the heat dissipation area 106a. The heat conduction element 106b is arranged such that it contacts at least either the housing 102 and / or the fixed connection 114. In this embodiment, the heat conduction element 106b is in contact with both the receptacle 102 and the fixed connection 114. The heat conduction element 106b can be made of a metal. If the heat conduction element 106b is made of a metal, a gap is preferably formed between the heat conduction element 106b and the fixed connection 114, or an insulating element is placed between the heat conduction element 106b and the fixed connection 114.

[0061] According to the representation in Fig. In this embodiment, the heat dissipation structure 106 can also include a vent 140. The vent 140 connects the heat dissipation area 106a to the outside of the receptacle 102. In this embodiment, the vent 140 extends through the container 102b of the receptacle 102. The vent 140 is preferably located in a position that overlaps the fixed connection 114 in the separation direction Z2. If the heat dissipation structure 106 includes the vent 140, the heat dissipation structure 106 need not necessarily include the heat conduction element 106b. The positions and shapes of the heat conduction element 106b and the vent 140 can be modified as required. For example, the vent 140 can be located in a position where it overlaps the fixed connection 114 in the separation direction Z2.

[0062] According to the invention, an electromagnetic relay can be provided which is able to effectively dissipate the heat of the fixed terminal and the movable contact piece during excitation. REFERENCE MARK 2nd recording 2c Recording area 4 drive shaft 5 electromagnetic drive device 6 Heat dissipation structure 6a First heat dissipation area (an example of a heat dissipation area) 6b first heat conduction element (an example of a heat conduction element) 6c Second heat dissipation area (an example of a heat dissipation area) 6d second heat conduction element (an example of a heat conduction element) 11 Contact housings 11a Floor 11e First contact carrier (an example of a contact carrier part) 11f second contact carrier (an example of a contact carrier) 14 First fixed connection (an example of a fixed connection) 14a first surface 14b second surface 14c First fixed contact (an example of a fixed contact) 15 Second fixed connection (an example of a fixed connection) 15a first surface 15b second surface 15c second fixed contact (an example of a fixed contact) 16 movable contact pieces 16a first movable contact (an example of a movable contact) 16b second movable contact (an example of a movable contact) 37a first yoke (an example of a yoke) 40 Ventilation 100 electromagnetic relays 102nd entry 102c recording area 105 electromagnetic drive device 106 Heat dissipation structure 106a Heat dissipation area 106b Heat conduction element 114 fixed connection 114a first surface 114b second surface 114c fixed contact 116 movable contact piece 116a movable contact 200 electromagnetic relays Z1 Contact direction (an example of a first direction) Z2 Separation direction (an example of a second direction)

Claims

[1] Electromagnetic relay (100), comprising: a fixed connection (14c, 15c), including a first surface (14a, 15a), a second surface (14b, 15b) arranged opposite the first surface (14a, 15a), and a fixed contact (14c, 15c) arranged on the first surface (14a, 15a); a movable contact piece (16) that includes a movable contact (16a, 16b) configured to touch the fixed contact (14c, 15c); a housing enclosing a receiving area (2c) in which a section of the fixed connector (14c, 15c), the fixed contact (14c, 15c) and the movable contact piece (16) are housed; a heat dissipation structure (6) which includes a heat dissipation area (6a, 6c) provided on the side of the second surface (14b, 15b) of the fixed connection (14c, 15c) to dissipate the heat from the fixed connection (14c, 15c) to an outside of the receiving area (2c); a contact housing (11) that defines the receiving area (2c) and the heat dissipation area (6a, 6c) and carries the fixed connection (14c, 15c); a drive shaft (4) which is movable with the movable contact piece (16) in a first direction (Z1) in which the movable contact piece (16) touches the fixed contact (14c, 15c), and in a second direction (Z2) in which the movable contact (16) separates from the fixed contact (14c, 15c), and an electromagnetic drive device (5) which moves the drive shaft (4) in the first and second directions (Z1, Z2), wherein the heat dissipation area (6a, 6c) is located adjacent to the receiving area (2c), the contact housing (11) includes a base (11a) and a contact carrier section (11e) which is arranged on the side of the second direction (Z1) of the base (11) to support the fixed terminal (14c, 15c); the fixed connection (14c, 15c) on the second surface (14b, 15b) is supported by the contact carrier section (11e) of the contact housing (11), and the heat dissipation area (6a, 6c) is arranged on the side of the first direction (Z1) of the contact carrier section (11e), the electromagnetic drive device (5) includes a yoke (37a) which is arranged on the side of the first direction (Z1) of the heat dissipation area (6a, 6c), and the heat dissipation area (6a, 6c) is surrounded by the contact carrier section (11e) of the contact housing (11) and the yoke (37a). [2] Electromagnetic relay (100) according to claim 1, wherein the heat dissipation structure (6) also includes a heat conduction element (6b, 6d) which is arranged in the heat dissipation area (6a, 6c) and which has a higher thermal conductivity than air. [3] Electromagnetic relay (100) according to claim 2, wherein the heat conduction element (6b, 6d) is arranged in contact with at least either the receptacle (2) and / or the fixed terminal (14c, 15c). [4] Electromagnetic relay (100) according to one of claims 1 to 3, wherein the heat dissipation structure (6) also includes a vent (40) that connects the heat dissipation area (6a, 6c) to an outside of the receptacle (2).

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