electromagnetic relay

Abstract

To suppress reignition of an arc generated at a contact, in an electromagnetic relay.SOLUTION: An electromagnetic relay comprises a case, a first fixed terminal, a movable contact piece, a gas inflow space, and a gas passage. The case includes a base. The first fixed terminal is held by the base. The first fixed terminal includes: a first fixed contact arranged in the case separately from the base in a first direction; a contact supporting part arranged between the first fixed contact and the base to support the first fixed contact; and a first extending part bent from the contact supporting part, penetrating through 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 supporting part in the case. The gas passage penetrates through the base in the first direction to communicate between the gas inflow space and the exterior of the case.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] In an electromagnetic relay, an arc occurs at the contacts when current is interrupted. If this arc raises the temperature of the contacts, the contacts may melt and generate high-temperature gas containing metal vapor. If this high-temperature gas accumulates near the contacts, the insulation performance between the contacts may deteriorate, and the arc may re-ignite. To prevent this re-ignition of the arc, the electromagnetic relay disclosed in Patent Document 1 has an arc-extinguishing space that extinguishes the arc, a gas inflow space separate from the arc-extinguishing space, and a gas passageway that releases high-temperature gas from the arc-extinguishing space to the gas inflow space within the case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-24864 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electromagnetic relay of Patent Document 1, the inlet and outlet of the gas passage are located near the contacts. Therefore, high-temperature gas easily passes through the gas passage and returns to the contacts. As the load capacity increases, the amount of high-temperature gas returning to the contacts also increases, which may cause the arc to restrike.

[0005] An object of the present invention is to suppress restrike of an arc occurring at a contact in an electromagnetic relay. [Means for solving the problem]

[0006] An electromagnetic relay according to one aspect of the present invention comprises a case, a first fixed terminal, a movable contact piece, a gas inflow space, and a gas passage. The case includes a base. The first fixed terminal is held by the base. The first fixed terminal includes a first fixed contact arranged inside the case and spaced apart from the base in a first direction, a contact support portion arranged 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 facing the first fixed contact in the first direction. The gas inflow space is formed inside the case between the base and the contact support portion. The gas passage penetrates the base in the first direction, connecting the gas inflow space to the outside of the case.

[0007] In this electromagnetic relay, a gas inflow space is formed between the base and the contact support part that supports the first fixed contact, and a gas passage connects the base to the outside of the case. Therefore, since the gas inflow space and gas passage can be formed near the first fixed contact, high-temperature gas caused by an arc generated between the first fixed contact and the first movable contact can be efficiently released from the gas passage to the outside of the case. This makes it possible to suppress restrike of the arc generated between the first fixed contact and the first movable contact.

[0008] The first fixed terminal may further include a second extension portion disposed opposite the first extension portion in a second direction perpendicular to the first direction and penetrating the base in the first direction. The contact support portion may be disposed between the first extension portion and the second extension portion. The gas passage may be disposed between the first extension portion and the second extension portion. Even in this case, high-temperature gas caused by an arc generated between the first fixed contact and the first movable contact can be efficiently released from the gas passage to the outside of the case.

[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 be formed in the terminal support portion. In this case, the gas inflow space and the gas passage are formed near the first fixed contact, so that high-temperature gas caused by an arc generated between the first fixed contact and the first movable contact can be efficiently released from the gas passage to the outside of the case.

[0010] The gas inlet space may be disposed adjacent to the terminal support portion, which can further suppress restrike of the arc occurring at the contacts.

[0011] The first fixed contact may include a crimped portion that is crimped to the first fixed terminal. The crimped portion may be disposed in the gas inlet space. In this case, the gas inlet space can be used as a space for the crimped portion to escape.

[0012] The gas inlet space may be open in the longitudinal direction of the movable contact piece, in which case the high-temperature gas generated by the arc is more easily guided into the gas inlet space.

[0013] The first fixed terminal may further include an external connection portion disposed on the first extension portion outside the case. The base may include a standoff portion protruding toward the external connection portion. In this case, blocking of the gas passage can be prevented when the external connection portion is connected to an external device.

[0014] The electromagnetic relay may further include a magnet that extends the 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, the arc moves along the first extension portion, so that high-temperature gas generated by the arc can be more effectively released from the gas passage to the outside of the case.

[0015] The electromagnetic relay may further include a second fixed terminal including a second fixed contact. The movable contact piece may further include a second movable contact facing the second fixed contact in the first direction. In this case, in an electromagnetic relay including the second fixed terminal, restrike of an arc occurring at the contact can be suppressed. [Effects of the Invention]

[0016] According to the present invention, restrike of an arc occurring at a contact in an electromagnetic relay is suppressed. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. [Figure 2] 3 is a cross-sectional view of the contact device taken along a plane perpendicular to the front-rear direction. FIG. [Figure 3] FIG. 1 is a perspective view of the periphery of a terminal support portion; [Figure 4] FIG. [Figure 5] FIG. 2 is a partial cross-sectional view of the electromagnetic relay taken along a plane perpendicular to the up-down direction. [Figure 6] FIG. 10 is a perspective view of the periphery of a terminal support portion according to a modified example. [Figure 7] FIG. 10 is a cross-sectional view of the periphery of a terminal support portion according to a modified example. [Figure 8] FIG. 10 is a cross-sectional view of the periphery of a terminal support portion according to a modified example. [Figure 9] FIG. 10 is a top view of the periphery of a terminal support portion according to a modified example. [Figure 10] FIG. 10 is a perspective view of the periphery of a terminal support portion according to a modified example. [Figure 11] FIG. 10 is a partial cross-sectional view of an electromagnetic relay according to a modified example taken along a plane perpendicular to the up-down direction. [Figure 12] FIG. 10 is a cross-sectional view of the periphery of a terminal support portion according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of an electromagnetic relay according to one aspect of the present invention will be described with reference to the drawings. In each drawing, the X1 direction is the leftward direction, the X2 direction is the rightward direction, the Y1 direction is the forward direction, the Y2 direction is the backward direction, the Z2 direction is the upward direction, and the Z1 direction is the downward direction. In this embodiment, the up-down direction is an example of a first direction, and the front-back direction is an example of a second direction. Note that these directions are defined for the convenience of explanation and do not limit the arrangement direction of the electromagnetic relay.

[0019] As shown in Figures 1 and 2, the electromagnetic relay 1 includes a case 2, a contact device 3, and a drive device 4. The case 2 is made of an insulating material such as resin. The case 2 includes a case main body 20 (see Figure 5) and a base 21. The case main body 20 is a substantially rectangular box that opens downward, and is attached to the base 21 so as to cover the base 21 from above. The base 21 has a rectangular shape when viewed from the top-bottom direction. The base 21 supports the contact device 3 and the drive device 4.

[0020] Fig. 2 is a cross-sectional view of the contact device 3 taken along a plane perpendicular to the front-rear direction. As shown in Figs. 1 and 2, the base 21 includes a bottom 22 and terminal support portions 23 and 24. The bottom 22 is generally plate-shaped and extends in the left-right and front-rear directions. The terminal support portions 23 and 24 are formed to protrude upward from the bottom 22. The terminal support portion 23 is spaced apart from the terminal support portion 24 in the left-right direction. The upper surfaces of the terminal support portions 23 and 24 include flat surfaces perpendicular to the up-down direction.

[0021] FIG. 3 is a perspective view of the periphery of the terminal support portion 23. FIG. 4 is a cross-sectional view of the periphery of the terminal support portion 23. As shown in FIGS. 3 and 4, 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 further than the connecting portion 23c. The first support portion 23a faces the second support portion 23b 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.

[0022] Terminal support portion 24 has a shape symmetrical to terminal support portion 23, and includes components corresponding to first support portion 23a, second support portion 23b, and connection portion 23c of terminal support portion 23. A detailed description of terminal support portion 24 will be omitted.

[0023] 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 made of a conductive material such as copper.

[0024] The first fixed terminal 6 and the second fixed terminal 7 have a U-shaped cross section and are bent into a U shape when viewed from the left and right. The first fixed terminal 6 and the second fixed terminal 7 are held by a base 21. The first fixed terminal 6 and the second fixed terminal 7 are fixed to the base 21 by, for example, press-fitting.

[0025] The first fixed terminal 6 includes a first fixed contact 6a, a contact support portion 6b, a first extending portion 6c, a second extending portion 6d, and a pair of external connection portions 6e. The first fixed contact 6a is disposed inside the case 2 and separated from the base 21 in the up-down direction. The first fixed contact 6a is disposed above the contact support portion 6b. The first fixed contact 6a includes a crimping portion 6f that is crimped and fixed to the first fixed terminal 6. The crimping portion 6f protrudes downward from the contact support portion 6b.

[0026] The contact support portion 6b is disposed between the first extending portion 6c and the second extending portion 6d. The contact support portion 6b is supported by the upper surfaces of the first supporting portion 23a and the second supporting portion 23b of the terminal supporting portion 23. The contact support portion 6b extends in a direction perpendicular to the up-down direction. The contact support portion 6b supports the first fixed contact 6a. The first fixed contact 6a is fixed to the contact support portion 6b by crimping. The first fixed contact 6a may be integral with the first fixed terminal 6.

[0027] The first extension 6c and the second extension 6d are press-fitted and fixed to the bottom 22 of the base 21. The first extension 6c is connected to the contact support 6b and protrudes outward from the case 2. The first extension 6c bends downward from the front end of the contact support 6b and passes through the bottom 22 of the base 21 in the vertical direction. The connection between the first extension 6c and the contact support 6b is formed in an R-shape. The first extension 6c is in contact with the front surface of the terminal support 23.

[0028] The second extending portion 6d faces the first extending portion 6c in the front-rear direction. The second extending portion 6d is connected to the contact support portion 6b and protrudes to the outside from the case 2. The second extending 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 up-down direction. The connecting portion between the second extending portion 6d and the contact support portion 6b is formed in an R-shape. The second extending portion 6d contacts the rear surface of the terminal support portion 23.

[0029] The pair of external connection portions 6e are arranged at the lower end of the first extending portion 6c and the lower end of the second extending portion 6d, and are electrically connected to external devices (not shown).

[0030] The second fixed terminal 7 is disposed apart 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 crimping portion (not shown). The components of the second fixed terminal 7 are similar to those of the first fixed terminal 6, and therefore description thereof will be omitted.

[0031] The movable contact piece 8 extends in the left-right direction. The longitudinal direction of the movable contact piece 8 coincides with the left-right direction. The lateral direction of the movable contact piece 8 coincides with the front-rear direction. The movable contact piece 8 is disposed above the first fixed terminal 6 and the second fixed terminal 7.

[0032] The movable contact piece 8 includes a first movable contact 8a and a second movable contact 8b. The first movable contact 8a faces the first fixed contact 6a in the vertical direction and is capable of contacting the first fixed contact 6a. The second movable contact 8b faces the second fixed contact 7a in the vertical direction and is capable of contacting the second fixed contact 7a. In this embodiment, the first movable contact 8a and the second movable contact 8b are fixed to the movable contact piece 8 by crimping, but the first movable contact 8a and the second movable contact 8b may be integral with the movable contact piece 8.

[0033] The movable contact piece 8 is movable in directions including the Z1 direction from the first movable contact 8a to the first fixed contact 6a and the Z2 direction from the first fixed contact 6a to the first movable contact 8a. In this embodiment, the movable contact piece 8 is movable in the up and down direction. The movable contact piece 8 is connected to a movable member 9. The movable contact piece 8 penetrates the movable member 9 in the left and right direction. The movable contact piece 8 is movable relative to the movable member 9 in the up and down direction.

[0034] 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 in the center of the movable contact piece 8 in the left-right direction. The movable member 9 is made of an insulating material such as resin. The upper end of the movable member 9 is connected to the drive unit 4. The movable member 9 is movable in the vertical direction.

[0035] The contact spring 10 is a coil spring, and biases the movable contact piece 8 in the contact direction (here, downward). The contact spring 10 is housed inside the movable member 9.

[0036] 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 a movable member 9. The driving device 4 includes a coil 4a, a spool 4b, a fixed iron core 4c, a yoke 4d, a movable iron piece 4e, a hinge spring 4f, and a return spring 4g.

[0037] The coil 4a is wound around the outer periphery of a spool 4b. The spool 4b extends in the vertical direction. The fixed core 4c is disposed on the inner periphery of the spool 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 and right. The yoke 4d is connected to the lower end of the fixed core 4c.

[0038] The movable iron piece 4e is rotatably supported by the yoke 4d via a hinge spring 4f. The movable iron piece 4e rotates around the upper end of the yoke 4d as a fulcrum. The front end of the movable iron piece 4e is located above the movable member 9. The movable iron piece 4e is located above the fixed iron core 4c. The hinge spring 4f biases the movable iron piece 4e in a direction away from the fixed iron core 4c. The return spring 4g is located between the base 21 and the movable member 9. The return spring 4g biases the movable member 9 in the separation direction (here, upward).

[0039] Here, we will explain the operation of the electromagnetic relay 1. When no voltage is applied to the coil 4a, the elastic forces of the hinge spring 4f and the return spring 4g press the movable member 9 in the opening direction. As a result, the first movable contact 8a is separated from the first fixed contact 6a, and the second movable contact 8b is separated from the second fixed contact 7a.

[0040] When a voltage is applied to the coil 4a and the drive unit 4 is excited, the movable iron piece 4e is attracted to the fixed iron core 4c and rotates, and the movable iron piece 4e presses the movable member 9 in the contact direction. As a result, 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 also moves in the contact direction. As a result, 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 voltage to the coil 4a is stopped, the movable member 9 moves in the opening direction due to the elastic forces of the hinge spring 4f and the return spring 4g.

[0041] The electromagnetic relay 1 further includes a first magnet 31, a second magnet 32, a gas inflow space , and a gas passage .

[0042] The first magnet 31 and the second magnet 32 ​​are permanent magnets. The first magnet 31 and the second magnet 32 ​​are arranged so that magnetic flux flows 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 so that opposite poles face each other in the left-right direction. In this embodiment, the first magnet 31 and the second magnet 32 ​​are arranged so that opposite poles face each other so that magnetic flux flows from the first magnet 31 to the second magnet 32. The first magnet 31 and the second magnet 32 ​​are attached to the outer peripheral surface of the case 2.

[0043] For example, when a current flows from the first movable contact 8a to the first fixed contact 6a, a forward Lorentz force acts on the arc generated between the first fixed contact 6a and the first movable contact 8a, causing the arc to extend in a direction from the contact support portion 6b toward the first extension portion 6c. On the other hand, when a current flows from the first fixed contact 6a to the first movable contact 8a, a backward Lorentz force acts on the arc.

[0044] The gas inflow space 34 is formed inside the case 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 this 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 above by the terminal support portion 23. The gas inflow space 34 overlaps the terminal support portion 23 and the first fixed contact 6a in the up-down direction. The crimped 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 allowing the crimped portion 6f to escape.

[0045] The gas passage 36 penetrates the base 21 in the vertical direction and connects the gas inflow space 34 to the outside of the case 2. The gas passage 36 is a passage for allowing high-temperature gas generated by an arc between the first fixed contact 6a and the first movable contact 8a to escape to the outside of the case 2. In this embodiment, the gas passage 36 is formed by a circular through-hole that penetrates the terminal support portion 23 and the bottom portion 22 of the base 21 in the vertical direction. The gas passage 36 overlaps the first fixed contact 6a and the contact support portion 6b in the vertical direction. The gas passage 36 is located below the first fixed contact 6a and the contact support portion 6b. The gas passage 36 is located between the first extension portion 6c and the second extension portion 6d of the first fixed terminal 6 in the front-rear direction.

[0046] The gas passage 36 includes an inlet 36a and an outlet 36b. The inlet 36a is formed in the connection portion 23c of the terminal support portion 23 and opens upward. The outlet 36b is formed in the bottom portion 22 of the base 21 and opens downward.

[0047] 2, the electromagnetic relay 1 further includes a gas inflow space 44 and a gas passage 46 arranged on the second fixed terminal 7 side. The gas passage 46 is a passage for allowing high-temperature gas caused by an arc generated between the second fixed contact 7a and the second movable contact 8b to escape to the outside of the case 2. The configurations of the gas inflow space 44 and the gas passage 46 are similar to those of the gas inflow space 34 and the gas passage 36 except that they are arranged on the second fixed terminal 7 side, so a description thereof will be omitted.

[0048] In this electromagnetic relay 1, a gas inflow space 34 is formed between the base 21 and the contact support portion 6b that supports the first fixed contact 6a, and is connected from the base 21 to the outside of the case 2 by a gas passage 36. Therefore, since the gas inflow space 34 and the gas passage 36 can be formed near the first fixed contact 6a, high-temperature gas caused by an arc generated between the first fixed contact 6a and the first movable contact 8a can be efficiently released from the gas passage 36 to the outside of the case 2. This makes it possible to suppress restrike of an arc generated between the first fixed contact 6a and the first movable contact 8a. Note that the gas inflow space 44 and the gas passage 46 can also suppress restrike of an arc generated between the second fixed contact 7a and the first movable contact 8a.

[0049] In this embodiment, the first extension portion 6c and the second extension portion 6d are arranged in the direction in which the arc extends, so the arc moves along the first extension portion 6c or the second extension portion 6d. The gas inflow space 34 is arranged near the first extension portion 6c and the second extension portion 6d, so that high-temperature gas generated by the arc can be more effectively released from the gas passage 36 to the outside of the case 2.

[0050] While the present invention has been described above with reference to an embodiment of an electromagnetic relay according to one aspect of the present invention, the present invention is not limited to the above embodiment and various modifications are possible without departing from the spirit and scope of the invention. For example, the configuration of the contact device 3 or the drive device 4 may be modified.

[0051] The shape of the first fixed terminal 6 may be changed. The first fixed terminal 6 may have an L-shaped cross section. For example, either the first extension portion 6c or the second extension portion 6d may be omitted. Although the first extension portion 6c and the second extension portion 6d protrude downward from the bottom portion 22 of the base 21, only one of the first extension portion 6c or the second extension portion 6d may protrude downward from the bottom portion 22 of the base 21.

[0052] The shape of the gas passage 36 may be changed. For example, the gas passage 36 may be formed as a rectangular through-hole. The gas passage 36 does not necessarily have to overlap the first fixed contact 6a in the vertical direction. As shown in FIG. 6, a plurality of gas passages 36 may be formed. As shown in FIG. 7, the gas passage 36 may have a shape tapering from the inlet 36a to the outlet 36b, or a shape tapering from the outlet 36b to the inlet 36a. Furthermore, as shown in FIG. 8, the outer diameter of the outlet 36b may be larger than the outer diameter of the inlet 36a.

[0053] The shape of the terminal support portion 23 may be changed. As shown in FIG. 9, the terminal support portion 23 does not have to extend to the left-right ends of the contact support portion 6b. In the example shown in FIG. 9, the contact support portion 6b protrudes leftward beyond the terminal support portion 23. Also, as shown in FIG. 10, the connection portion 23c of the terminal support portion 23 may be omitted. In this case, the inlet 36a of the gas passage 36 may be formed in the bottom portion 22 of the base 21.

[0054] The shape of the gas inflow space 34 may be changed. For example, the terminal support portion 23 does not have to be open upward. Furthermore, the terminal support portion 23 does not have to penetrate in the left-right direction, and may be open only to the left, for example.

[0055] The first magnet 31 and the second magnet 32 ​​may be arranged facing each other in the front-rear direction, or may be arranged so that the same poles face each other, and the number of magnets for extending the arc may be one or three or more. The first magnet 31 and the second magnet 32 ​​are examples of magnets.

[0056] As shown in FIG. 11 , the electromagnetic relay 1 may further include a guide member 48 that guides high-temperature gas generated by the arc between the first fixed contact 6a and the first movable contact 8a to the gas inflow space 34 in the space where the arc extends. The guide member 48 may be integral with or separate from the case 2. The guide member 48 may include a first guide portion 48a and a second guide portion 48b. The first guide portion 48a and the second guide portion 48b protrude from the inside of the case body 20 toward the first fixed terminal 6. The first guide portion 48a and the second guide portion 48b are inclined with respect to the case body 20. When a forward Lorentz force acts on the arc generated between the first fixed contact 6a and the first movable contact 8a, the high-temperature gas generated by the arc is guided to the gas inflow space 34 by the inclined surfaces of the first guide portion 48a and the second guide portion 48b.

[0057] 12, standoff portions 26 may be formed on the base 21. The standoff portions 26 are formed to protrude from the bottom portion 22 of the base 21 toward the external connection portions 6e. The standoff portions 26 are disposed such that their lower ends contact the surface of the substrate 50. The standoff portions 26 prevent the outlets 36b of the gas passages 36 from being blocked when the pair of external connection portions 6e are connected to external devices. [Explanation of symbols]

[0058] 1 Electromagnetic relay 2. Bass 6 1st fixed terminal 6a 1st fixed contact 6b Contact support part 6b 1st extension section 6d 2nd extension section 6e A pair of external connections (an example of an external connection) 6f Crimping part 7 Second fixed terminal 7a 2nd fixed contact 8 Movable contact piece 8a 1st fixed contact 8b 2nd fixed contact 26 Standoff section 34 Gas inlet space 36 Gas passage

Claims

1. a case including a base; a first fixed terminal held by the base, the first fixed contact being spaced apart from the base in a first direction inside the case; a contact support portion being 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; a movable contact piece including a first movable contact facing the first fixed contact in the first direction; a gas inflow space formed between the base and the contact support part inside the case; a gas passage penetrating the base in the first direction and communicating the gas inflow space with the outside of the case; Equipped with the first fixed terminal further includes a second extending portion disposed opposite the first extending portion in a second direction perpendicular to the first direction and penetrating 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. Electromagnetic relay.

2. a case including a base; a first fixed terminal held by the base, the first fixed contact being spaced apart from the base in a first direction inside the case; a contact support portion being 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; a movable contact piece including a first movable contact facing the first fixed contact in the first direction; a gas inflow space formed between the base and the contact support part inside the case; a gas passage penetrating the base in the first direction and communicating the gas inflow space with the outside of the case; Equipped with 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. Electromagnetic relay.

3. The gas inflow space is disposed adjacent to the terminal support portion.

3. The electromagnetic relay according to claim 2.

4. the first fixed contact includes a crimping portion that is crimped and fixed to the first fixed terminal, The crimping portion is disposed in the gas inflow space.

4. The electromagnetic relay according to claim 3.

5. a case including a base; a first fixed terminal held by the base, the first fixed contact being spaced apart from the base in a first direction inside the case; a contact support portion being 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; a movable contact piece including a first movable contact facing the first fixed contact in the first direction; a gas inflow space formed between the base and the contact support part inside the case; a gas passage penetrating the base in the first direction and communicating the gas inflow space with the outside of the case; Equipped with The gas inflow space opens in the longitudinal direction of the movable contact piece. Electromagnetic relay.

6. a case including a base; a first fixed terminal held by the base, the first fixed contact being spaced apart from the base in a first direction inside the case; a contact support portion being 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; a movable contact piece including a first movable contact facing the first fixed contact in the first direction; a gas inflow space formed between the base and the contact support part inside the case; a gas passage penetrating the base in the first direction and communicating the gas inflow space with the outside of the case; Equipped with the first fixed terminal further includes an external connection portion disposed on the first extension portion outside the case, the base includes a standoff portion protruding toward the external connection portion; Electromagnetic relay.

7. a case including a base; a first fixed terminal held by the base, the first fixed contact being spaced apart from the base in a first direction inside the case; a contact support portion being 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; a movable contact piece including a first movable contact facing the first fixed contact in the first direction; a gas inflow space formed between the base and the contact support part inside the case; a gas passage penetrating the base in the first direction and communicating the gas inflow space with the outside of the case; Equipped with The switch further includes a magnet that extends 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. Electromagnetic relay.

8. a second fixed terminal including a second fixed contact; The movable contact piece further includes a second movable contact facing the second fixed contact in the first direction.

8. An electromagnetic relay according to any one of claims 1 to 7.

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