Electromagnetic relay

Abstract

An electromagnetic relay suppresses retriggering of an arc generated at a contact. The electromagnetic relay includes a housing, a first fixed terminal, a movable contact piece, a gas inflow space, and a gas passage. The housing includes a base. The first fixed terminal is held by the base. The first fixed terminal includes: a first fixed contact configured to be separated from the base in a first direction inside the housing; a contact support portion disposed between the first fixed contact and the base and supporting the first fixed contact; and a first extension portion bent from the contact support portion and penetrating the base in the first direction. The movable contact piece includes a first movable contact opposed to the first fixed contact in the first direction. The gas inflow space is formed inside the housing between the base and the contact support portion. The gas passage penetrates the base in the first direction and communicates the gas inflow space with the outside of the housing.

Description

Technical Field

[0001] The present invention relates to an electromagnetic relay. Background Art

[0002] When an electromagnetic relay cuts off current, an arc is generated at the contact. If the temperature of the contact rises due to this arc, the contact may melt and generate a high-temperature gas including metal vapor. If this high-temperature gas stays near the contact, the insulation performance between the contacts decreases, and there is a possibility of re-triggering the arc. To prevent the re-triggering of this arc, the electromagnetic relay disclosed in Patent Document 1 is provided with an arc extinguishing space for extinguishing the arc, a gas inflow space independent of the arc extinguishing space, and a gas passage for allowing the high-temperature gas to escape from the arc extinguishing space to the gas inflow space inside the housing.

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2016-24864

[0004] In the electromagnetic relay of Patent Document 1, the inlet and outlet of the gas passage are arranged near the contact. Therefore, the high-temperature gas easily returns to the contact through the gas passage. If the load capacity increases, the amount of the high-temperature gas returning to the vicinity of the contact also increases, so there is a concern about arc re-triggering. Summary of the Invention

[0005] An object of the present invention is to suppress the re-triggering of an arc generated at a contact in an electromagnetic relay.

[0006] An electromagnetic relay according to one aspect of the present invention includes a housing, a first fixed terminal, a movable contact piece, a gas inflow space, and a gas passage. The housing includes a base. The first fixed terminal is held by the base. The first fixed terminal includes a first fixed contact, a contact support portion, and a first extension portion. The first fixed contact is arranged to be separated from the base in a first direction inside the housing. The contact support portion is arranged between the first fixed contact and the base and supports the first fixed contact. The first extension portion bends from the contact support portion and penetrates the base in the first direction. The movable contact piece includes a first movable contact opposed to the first fixed contact in the first direction. The gas inflow space is formed between the base and the contact support portion inside the housing. The gas passage penetrates the base in the first direction and communicates the gas inflow space with the outside of the housing.

[0007] In this electromagnetic relay, a gas inflow space is formed between the base and the contact support portion that supports the first fixed contact, and communicates with the outside of the housing through a gas passage from the base. Therefore, a gas inflow space and a gas passage can be formed near the first fixed contact, so that the high-temperature gas formed by the arc generated between the first fixed contact and the first movable contact can be efficiently dissipated from the gas passage to the outside of the housing. Thereby, re-triggering of the arc generated between the first fixed contact and the first movable contact can be suppressed.

[0008] The first fixed terminal may further include a second extension portion that is configured to face the first extension portion in a second direction orthogonal to the first direction and penetrate the base in the first direction. The contact support portion may also be disposed between the first extension portion and the second extension portion. The gas passage may also be disposed between the first extension portion and the second extension portion. In this case, the high-temperature gas formed by the arc generated between the first fixed contact and the first movable contact can also be efficiently dissipated from the gas passage to the outside of the housing.

[0009] The base may include a terminal support portion that supports the contact support portion of the first fixed terminal. The gas inflow space may also be formed in the terminal support portion. In this case, since a gas inflow space and a gas passage are formed near the first fixed contact, the high-temperature gas formed by the arc generated between the first fixed contact and the first movable contact can be efficiently dissipated from the gas passage to the outside of the housing.

[0010] The gas inflow space may be configured to be adjacent to the terminal support portion. In this case, re-triggering of the arc generated at the contact can be further suppressed.

[0011] The first fixed contact may include a riveting portion that is riveted and fixed to the first fixed terminal. The riveting portion may also be disposed in the gas inflow space. In this case, the gas inflow space can be used as a space for the riveting portion to retreat.

[0012] The gas inflow space may also open toward the long side direction of the movable contact piece. In this case, it is easy to guide the high-temperature gas formed by the arc to the gas inflow space.

[0013] The first fixed terminal may further include an external connection portion disposed outside the first extension portion outside the housing. The base may also include a support pillar portion that protrudes toward the external connection portion. In this case, when connecting the external connection portion to an external device, it is possible to prevent the gas passage from being blocked.

[0014] The electromagnetic relay may also include a magnet that elongates an arc generated between the first fixed contact and the first movable contact in a direction from the contact support portion toward the first extension portion. In this case, since the arc moves along the first extension portion, the high-temperature gas formed by the arc can be more effectively dissipated from the gas passage to the outside of the housing.

[0015] The electromagnetic relay may also include a second fixed terminal including a second fixed contact. The movable contact piece may also include a second movable contact opposed to the second fixed contact in a first direction. In this case, in the electromagnetic relay including the second fixed terminal, re-triggering of the arc generated at the contact can be suppressed.

[0016] According to the present invention, in an electromagnetic relay, re-triggering of the arc generated at the contact is suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the electromagnetic relay.

[0018] Figure 2 is a cross-sectional view of the contact device taken in a plane orthogonal to the front-rear direction.

[0019] Figure 3 is a perspective view of the periphery of the terminal support portion.

[0020] Figure 4 is a cross-sectional view of the periphery of the terminal support portion.

[0021] Figure 5 is a partial cross-sectional view of the electromagnetic relay taken in a plane orthogonal to the up-down direction.

[0022] Figure 6 is a perspective view of the periphery of the terminal support portion of a modified example.

[0023] Figure 7 is a cross-sectional view of the periphery of the terminal support portion of a modified example.

[0024] Figure 8 is a cross-sectional view of the periphery of the terminal support portion of a modified example.

[0025] Figure 9 is a view of the periphery of the terminal support portion of a modified example as viewed from above.

[0026] Figure 10 is a perspective view of the periphery of the terminal support portion of a modified example.

[0027] Figure 11 is a partial cross-sectional view of the modified electromagnetic relay taken in a plane orthogonal to the up-down direction.

[0028] Figure 12It is a cross-sectional view of the periphery of the terminal support part of the modified example.

[0029] Symbol Explanation

[0030] 1…Electromagnetic relay; 2…Housing; 6…First fixed terminal; 6a…First fixed contact; 6b…Contact support part; 6c…First extension part; 6d…Second extension part; 6e…Pair of external connection parts (an example of external connection parts); 6f…Riveting part; 7…Second fixed terminal; 7a…Second fixed contact; 8…Movable contact piece; 8a…First fixed contact; 8b…Second fixed contact; 26…Stand-off; 34…Gas inflow space; 36…Gas passage. Detailed Implementation Manner

[0031] Hereinafter, an implementation manner of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. Among them, in each drawing, the X1 direction is taken as the left direction, the X2 direction is taken as the right direction, the Y1 direction is taken as the front direction, the Y2 direction is taken as the rear direction, the Z2 direction is taken as the upper direction, and the Z1 direction is taken as the lower direction for description. In the present embodiment, the up-down direction is an example of the first direction, and the front-rear direction is an example of the second direction. In addition, the above directions are defined for convenience of description and do not limit the arrangement direction of the electromagnetic relay.

[0032] As Figure 1 and Figure 2 shown, the electromagnetic relay 1 includes a housing 2, a contact device 3, and a driving device 4. The housing 2 is formed of an insulating material such as resin. The housing 2 includes a housing main body 20 (refer to Figure 5 ) and a base 21. The housing main body 20 is a substantially quadrilateral box-shaped opening downward, and is mounted on the base 21 so as to cover the base 21 from above. The base 21 is rectangular when viewed from the up-down direction. The base 21 supports the contact device 3 and the driving device 4.

[0033] Figure 2 It is a cross-sectional view of the contact device 3 cut in a plane orthogonal to the front-rear direction. As Figure 1 and Figure 2 shown, the base 21 includes a bottom 22 and terminal support parts 23, 24. The bottom 22 is substantially plate-shaped and extends in the left-right direction and the front-rear direction. The terminal support parts 23, 24 are formed to protrude upward from the bottom 22. The terminal support part 23 is arranged to be separated from the terminal support part 24 in the left-right direction. The upper surfaces of the terminal support parts 23, 24 include flat surfaces orthogonal to the up-down direction.

[0034] Figure 3 It is a perspective view of the periphery of the terminal support part 23. Figure 4 It is a cross-sectional view of the periphery of the terminal support part 23. As Figure 3 andFigure 4 As shown, the terminal support portion 23 includes a first support portion 23a, a second support portion 23b, and a connecting portion 23c. The first support portion 23a and the second support portion 23b extend upward from the bottom portion 22. The first support portion 23a and the second support portion 23b extend upward more than the connecting portion 23c. The first support portion 23a and the second support portion 23b are opposed to each other in the front-rear direction. The connecting portion 23c extends upward from the bottom portion 22 between the first support portion 23a and the second support portion 23b. The connecting portion 23c is connected to the lower end of the first support portion 23a and the lower end of the second support portion 23b.

[0035] The terminal support portion 24 has a shape that is bilaterally symmetric with the terminal support portion 23, and includes structures corresponding to the first support portion 23a, the second support portion 23b, and the connecting portion 23c of the terminal support portion 23. A detailed description of the terminal support portion 24 is omitted.

[0036] The contact device 3 includes a first fixed terminal 6, a second fixed terminal 7, a movable contact piece 8, a movable member 9, and a contact spring 10. The first fixed terminal 6, the second fixed terminal 7, and the movable contact piece 8 are plate-shaped terminals formed of a conductive material such as copper.

[0037] The cross-sections of the first fixed terminal 6 and the second fixed terminal 7 are U-shaped, and have a shape that is bent in a U-shape when viewed from the left-right direction. The first fixed terminal 6 and the second fixed terminal 7 are held by the base 21. The first fixed terminal 6 and the second fixed terminal 7 are press-fitted and fixed to the base 21, for example.

[0038] The first fixed terminal 6 includes a first fixed contact 6a, a contact support portion 6b, a first extension portion 6c, a second extension portion 6d, and a pair of external connection portions 6e. The first fixed contact 6a is arranged to be separated from the base 21 in the up-down direction inside the housing 2. The first fixed contact 6a is arranged above the contact support portion 6b. The first fixed contact 6a includes a riveting portion 6f that is riveted and fixed to the first fixed terminal 6. The riveting portion 6f projects downward from the contact support portion 6b.

[0039] The contact support portion 6b is arranged between the first extension portion 6c and the second extension portion 6d. The contact support portion 6b is supported at the upper surfaces of the first support portion 23a and the second support portion 23b at the terminal support portion 23. The contact support portion 6b extends in a direction orthogonal to the up-down direction. The contact support portion 6b supports the first fixed contact 6a. The first fixed contact 6a is riveted and fixed to the contact support portion 6b. In addition, the first fixed contact 6a may be integrated with the first fixed terminal 6.

[0040] The first extension portion 6c and the second extension portion 6d are press-fitted and fixed to the bottom portion 22 of the base 21. The first extension portion 6c is connected to the contact support portion 6b and protrudes outward from the housing 2. The first extension portion 6c bends downward from the front end of the contact support portion 6b and penetrates the bottom portion 22 of the base 21 in the vertical direction. The connecting portion of the first extension portion 6c and the contact support portion 6b is formed in an arc shape (R shape). The first extension portion 6c contacts the front surface of the terminal support portion 23.

[0041] The second extension portion 6d is opposed to the first extension portion 6c in the front-rear direction. The second extension portion 6d is connected to the contact support portion 6b and protrudes outward from the housing 2. The second extension portion 6d bends downward from the rear end of the contact support portion 6b and penetrates the bottom portion 22 of the base 21 in the vertical direction. The connecting portion of the second extension portion 6d and the contact support portion 6b is formed in an arc shape. The second extension portion 6d contacts the rear surface of the terminal support portion 23.

[0042] A pair of external connection portions 6e are arranged at the lower ends of the first extension portion 6c and the second extension portion 6d and are electrically connected to an external device (not shown).

[0043] The second fixed terminal 7 is arranged to be separated from the first fixed terminal 6 in the left-right direction. The second fixed terminal 7 has the same shape as the first fixed terminal 6. The second fixed terminal 7 includes a second fixed contact 7a, a contact support portion 7b, a first extension portion 7c, a second extension portion 7d, and a pair of external connection portions 7e. The second fixed contact 7a includes a riveting portion (not shown). Since each structure of the second fixed terminal 7 is the same as each structure of the first fixed terminal 6, the description thereof is omitted.

[0044] The movable contact piece 8 extends in the left-right direction. The long side direction of the movable contact piece 8 coincides with the left-right direction. The short side direction of the movable contact piece 8 coincides with the front-rear direction. The movable contact piece 8 is arranged above the first fixed terminal 6 and the second fixed terminal 7.

[0045] The movable contact piece 8 includes a first movable contact 8a and a second movable contact 8b. The first movable contact 8a is opposed to the first fixed contact 6a in the vertical direction and can contact the first fixed contact 6a. The second movable contact 8b is opposed to the second fixed contact 7a in the vertical direction and can contact the second fixed contact 7a. In addition, in the present embodiment, the first movable contact 8a and the second movable contact 8b are riveted and fixed to the movable contact piece 8, but the first movable contact 8a and the second movable contact 8b may also be integrally formed with the movable contact piece 8.

[0046] The movable contact piece 8 is capable of moving in a moving direction, which includes a Z1 direction from the first movable contact 8a towards the first fixed contact 6a and a Z2 direction from the first fixed contact 6a towards the first movable contact 8a. In the present embodiment, the movable contact piece 8 is capable of moving in the vertical direction. The movable contact piece 8 is connected to the movable member 9. The movable contact piece 8 penetrates the movable member 9 in the left-right direction. The movable contact piece 8 is capable of relatively moving in the vertical direction with respect to the movable member 9.

[0047] The movable member 9 holds the movable contact piece 8. The movable member 9 extends in the vertical direction. The movable member 9 is disposed at the center of the movable contact piece 8 in the left-right direction. The movable member 9 is formed of an insulating material such as resin. The upper end of the movable member 9 is connected to the driving device 4. The movable member 9 is capable of moving in the vertical direction.

[0048] The contact spring 10 is a helical spring that applies a force to the movable contact piece 8 in the contact direction (here, the downward direction). The contact spring 10 is housed inside the movable member 9.

[0049] The driving device 4 is disposed behind the contact device 3. The driving device 4 moves the movable contact piece 8 in the vertical direction via the movable member 9. The driving device 4 includes a coil 4a, a bobbin 4b, a fixed iron core 4c, a yoke 4d, a movable iron piece 4e, a hinge spring 4f, and a return spring 4g.

[0050] The coil 4a is wound around the outer periphery of the bobbin 4b. The bobbin 4b extends in the vertical direction. The fixed iron core 4c is disposed at the inner peripheral portion of the bobbin 4b. The yoke 4d is disposed so as to cover the rear of the coil 4a. The yoke 4d is substantially L-shaped when viewed from the left-right direction. The yoke 4d is connected to the lower end of the fixed iron core 4c.

[0051] The movable iron piece 4e is supported by the yoke 4d via the hinge spring 4f so as to be rotatable. The movable iron piece 4e rotates with the upper end of the yoke 4d as a fulcrum. The front end of the movable iron piece 4e is disposed at the upper part of the movable member 9. The movable iron piece 4e is disposed above the fixed iron core 4c. The hinge spring 4f applies a force to the movable iron piece 4e in a direction away from the fixed iron core 4c. The return spring 4g is disposed between the base 21 and the movable member 9. The return spring 4g applies a force to the movable member 9 in a separating direction (here, the upward direction).

[0052] Here, the operation of the electromagnetic relay 1 will be described. In a state where no voltage is applied to the coil 4a, the movable member 9 is pressed in the separating direction by the elastic forces of the hinge spring 4f and the return spring 4g. Therefore, the first movable contact 8a separates from the first fixed contact 6a, and the second movable contact 8b separates from the second fixed contact 7a.

[0053] When a voltage is applied to the coil 4a to excite the drive device 4, the movable iron piece 4e is attracted by the fixed iron core 4c and rotates, and presses the movable member 9 in the contact direction through the movable iron piece 4e. Thus, the movable member 9 moves in the contact direction against the elastic forces of the hinge spring 4f and the return spring 4g. As the movable member 9 moves in the contact direction, the contact spring 10 moves in the contact direction. Thus, the movable contact piece 8 moves in the contact direction, and the first movable contact 8a contacts the first fixed contact 6a, and the second movable contact 8b contacts the second fixed contact 7a. When the application of the voltage to the coil 4a stops, the movable member 9 moves in the separating direction due to the elastic forces of the hinge spring 4f and the return spring 4g.

[0054] The electromagnetic relay 1 further includes a first magnet 31, a second magnet 32, a gas inflow space 34, and a gas passage 36.

[0055] The first magnet 31 and the second magnet 32 are permanent magnets. The first magnet 31 and the second magnet 32 are arranged such that magnetic fluxes flow in the left - right direction between the first fixed contact 6a and the first movable contact 8a, and between the second fixed contact 7a and the second movable contact 8b. The first magnet 31 and the second magnet 32 are arranged such that opposite poles face each other in the left - right direction. In the present embodiment, the first magnet 31 and the second magnet 32 are arranged such that opposite poles face each other so that magnetic fluxes flow from the first magnet 31 toward the second magnet 32. The first magnet 31 and the second magnet 32 are mounted on the outer peripheral surface of the housing 2.

[0056] For example, when current flows from the first movable contact 8a toward the first fixed contact 6a, a Lorentz force in the forward direction acts on the arc generated between the first fixed contact 6a and the first movable contact 8a, and the arc extends in the direction from the contact support portion 6b toward the first extension portion 6c. On the other hand, when current flows from the first fixed contact 6a toward the first movable contact 8a, a Lorentz force in the backward direction acts on the arc.

[0057] The gas inflow space 34 is formed inside the housing 2 between the base 21 and the contact support portion 6b of the first fixed terminal 6. The gas inflow space 34 is formed in the terminal support portion 23. In the present embodiment, the gas inflow space 34 is a space formed by a recess that penetrates the terminal support portion 23 in the left - right direction between the first support portion 23a and the second support portion 23b of the terminal support portion 23 and opens upward. The gas inflow space 34 is arranged adjacent to the terminal support portion 23 in the up - down direction. The gas inflow space 34 is arranged below the terminal support portion 23 and is covered by the terminal support portion 23 above. The gas inflow space 34 overlaps the terminal support portion 23 and the first fixed contact 6a in the up - down direction. The riveting portion 6f of the first fixed contact 6a is arranged in the gas inflow space 34, and the gas inflow space 34 also serves as a space for the riveting portion 6f to retract.

[0058] The gas passage 36 penetrates the base 21 in the vertical direction, connecting the gas inflow space 34 with the outside of the housing 2. The gas passage 36 is a passage for dissipating the high-temperature gas formed by the arc generated between the first fixed contact 6a and the first movable contact 8a to the outside of the housing 2. In the present embodiment, the gas passage 36 is composed of a terminal support portion 23 penetrating the base 21 in the vertical direction and a circular through-hole in the bottom 22. The gas passage 36 overlaps with the first fixed contact 6a and the contact support portion 6b in the vertical direction. The gas passage 36 is disposed below the first fixed contact 6a and the contact support portion 6b. The gas passage 36 is disposed between the first extension portion 6c and the second extension portion 6d of the first fixed terminal 6 in the front-rear direction.

[0059] The gas passage 36 includes an inlet 36a and an outlet 36b. The inlet 36a is formed at the connecting portion 23c of the terminal support portion 23 and opens upward. The outlet 36b is formed at the bottom 22 of the base 21 and opens downward.

[0060] In addition, as Figure 2 shown, the electromagnetic relay 1 further includes a gas inflow space 44 and a gas passage 46 disposed on the side of the second fixed terminal 7. The gas passage 46 is a passage for dissipating the high-temperature gas formed by the arc generated between the second fixed contact 7a and the second movable contact 8b to the outside of the housing 2. Regarding the structures of the gas inflow space 44 and the gas passage 46, the structures other than being disposed on the side of the second fixed terminal 7 are similar to those of the gas inflow space 34 and the gas passage 36, and thus the description thereof is omitted.

[0061] In this electromagnetic relay 1, the gas inflow space 34 is formed between the base 21 and the contact support portion 6b that supports the first fixed contact 6a, and communicates from the base 21 to the outside of the housing 2 through the gas passage 36. Therefore, the gas inflow space 34 and the gas passage 36 can be formed near the first fixed contact 6a, so that the high-temperature gas formed by the arc generated between the first fixed contact 6a and the first movable contact 8a can be efficiently dissipated from the gas passage 36 to the outside of the housing 2. Thereby, re-triggering of the arc generated between the first fixed contact 6a and the first movable contact 8a can be suppressed. In addition, regarding the arc generated between the second fixed contact 7a and the first movable contact 8a, re-triggering can be suppressed by using the gas inflow space 44 and the gas passage 46.

[0062] Further, in the present embodiment, since the first extension portion 6c and the second extension portion 6d are arranged in the direction in which the arc elongates, the arc moves along the first extension portion 6c or the second extension portion 6d. Moreover, since the gas inflow space 34 is arranged near the first extension portion 6c and the second extension portion 6d, the high-temperature gas formed by the arc can be more effectively dissipated from the gas passage 36 to the outside of the housing 2.

[0063] The embodiments of the electromagnetic relay according to one aspect of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention. For example, the structures of the contact device 3 or the drive device 4 can also be changed.

[0064] The shape of the first fixed terminal 6 can also be changed. The cross-section of the first fixed terminal 6 can also be L-shaped. For example, either the first extension portion 6c or the second extension portion 6d can be omitted. The first extension portion 6c and the second extension portion 6d protrude downward from the bottom 22 of the base 21, but only one of the first extension portion 6c or the second extension portion 6d can protrude downward from the bottom 22 of the base 21.

[0065] The shape of the gas passage 36 can also be changed. For example, the gas passage 36 can also be formed by a rectangular through-hole. The gas passage 36 does not necessarily overlap with the first fixed contact 6a in the vertical direction. Multiple gas passages 36 can also be formed as shown in Figure 6 . Multiple gas passages 36 can also be formed as shown in Figure 7 . As shown in Figure 8 , the gas passage 36 has a shape that tapers from the inlet 36a toward the outlet 36b, or a shape that tapers from the outlet 36b toward the inlet 36a. And, as shown in

[0066] , the shape of the terminal support portion 23 can also be changed. As shown in Figure 9 , the terminal support portion 23 may not extend to the left and right ends of the contact support portion 6b. In the example shown in Figure 9 , the contact support portion 6b protrudes more to the left than the terminal support portion 23. And, as shown in Figure 10 , the connecting portion 23c of the terminal support portion 23 can be omitted. In this case, the inlet 36a of the gas passage 36 can also be formed in the bottom 22 of the base 21.

[0067] The shape of the gas inflow space 34 can also be changed. For example, the terminal support portion 23 may not open upward. And the terminal support portion 23 may not penetrate in the left and right directions. For example, it may only open to the left.

[0068] The first magnet 31 and the second magnet 32 can be arranged to face each other in the front-rear direction, or can be arranged with the same poles facing each other, and the magnet for elongating the arc can be one, or more than three. The first magnet 31 and the second magnet 32 are an example of magnets.

[0069] It can also be as Figure 11 shown that the electromagnetic relay 1 further includes a guiding member 48. In the space where the arc generated between the first fixed contact 6a and the first movable contact 8a elongates, the guiding member 48 guides the high-temperature gas formed by the arc to the gas inflow space 34. The guiding member 48 can be integrated with the housing 2 or independent of the housing 2. The guiding member 48 can also include a first guiding portion 48a and a second guiding portion 48b. The first guiding portion 48a and the second guiding portion 48b project from the inside of the housing main body 20 toward the first fixed terminal 6. The first guiding portion 48a and the second guiding portion 48b are inclined with respect to the housing main body 20. When a Lorentz force in the forward direction acts on the arc generated between the first fixed contact 6a and the first movable contact 8a, the high-temperature gas formed by the arc is guided to the gas inflow space 34 through the inclined surfaces of the first guiding portion 48a and the second guiding portion 48b.

[0070] It can also be as Figure 12 shown that a support portion 26 is formed on the base 21. The support portion 26 is formed to project from the bottom 22 of the base 21 toward the external connection portion 6e. The support portion 26 is arranged such that its lower end contacts the surface of the bottom plate 50. When connecting a pair of external connection portions 6e to an external device, the support portion 26 prevents the outflow port 36b of the gas passage 36 from being blocked.

Claims

1. An electromagnetic relay, characterized in that, Comprising: A housing including a base; A first fixed terminal held by the base and including a first fixed contact, a contact support portion, and a first extension portion, wherein the first fixed contact is configured to be separated from the base in a first direction inside the housing, the contact support portion is disposed between the first fixed contact and the base and supports the first fixed contact, and the first extension portion bends from the contact support portion and penetrates the base in the first direction; A movable contact piece including a first movable contact opposed to the first fixed contact in the first direction; A gas inflow space formed inside the housing between the base and the contact support portion; and A gas passage penetrating the base in the first direction to communicate the gas inflow space with the outside of the housing.

2. The electromagnetic relay according to claim 1, wherein The first fixed terminal further includes a second extension portion configured to be opposed to the first extension portion in a second direction orthogonal to the first direction and penetrate the base in the first direction, The contact support portion is disposed between the first extension portion and the second extension portion, The gas passage is disposed between the first extension portion and the second extension portion.

3. The electromagnetic relay according to claim 1 or 2, wherein The base includes a terminal support portion that supports the contact support portion of the first fixed terminal, The gas inflow space is formed in the terminal support portion.

4. The electromagnetic relay according to claim 3, wherein The gas inflow space is configured to be adjacent to the terminal support portion.

5. The electromagnetic relay according to claim 4, wherein The first fixed contact includes a riveted portion riveted to the first fixed terminal, The riveted portion is disposed in the gas inflow space.

6. The electromagnetic relay according to claim 1 or 2, wherein The gas inflow space opens toward the long side direction of the movable contact piece.

7. The electromagnetic relay according to claim 1 or 2, wherein The first fixed terminal further includes an external connection portion disposed outside the first extension portion outside the housing, The base includes a pillar portion protruding toward the external connection portion.

8. The electromagnetic relay according to claim 1 or 2, wherein It further includes a magnet that elongates an arc generated between the first fixed contact and the first movable contact in a direction from the contact support portion toward the first extension portion.

9. The electromagnetic relay according to claim 1 or 2, wherein It further includes a second fixed terminal including a second fixed contact, The movable contact piece further includes a second movable contact opposed to the second fixed contact in the first direction.

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