electromagnetic relay

Abstract

To enhance the contact force of contacts in a case where at least one of fixed contacts and movable contacts is melted and dispersed.SOLUTION: An electromagnetic relay comprises a first fixed terminal, a first fixed contact, a movable contact piece, a first movable contact, a drive shaft, a drive device, a contact case, and a guide wall. The movable contact piece includes a first surface opposed to the first fixed contact, and a second surface opposite to the first surface. The first movable contact is arranged on the first surface of the movable contact piece, and is opposed to the first fixed contact in a second direction. The drive device moves the movable contact piece in the second direction via the drive shaft. The contact case houses the first fixed contact, a second fixed contact, the first movable contact, a second movable contact, and the movable contact piece. The guide wall is connected with an inner surface of the contact case. The guide wall guides a first air flow in the vicinity of the first fixed contact and the first movable contact that is generated due to a current flowing between the first fixed contact and the first movable contact toward the second surface of the movable contact piece.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Electromagnetic relays that open and close electric circuits have been known. The electromagnetic relay described in Patent Document 1 is a plunger-type electromagnetic relay that includes a contact case, a fixed terminal, a fixed contact, a movable contact, a movable contact piece, and a drive device. The contact case houses the fixed contact, the movable contact, and the movable contact piece. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-079109 Summary of the Invention [Problem to be solved by the invention]

[0004] In an electromagnetic relay, when a large current such as a short-circuit current flows through the fixed contacts and the moving contacts, at least one of the fixed contacts and the moving contacts may melt and scatter. In this case, to prevent an arc from occurring between the contacts, it is preferable to weld the contacts to keep them closed. If the driving force of the driving device is increased to ensure the contact force of the contacts in order to weld the contacts, the driving device may become larger.

[0005] An object of the present invention is to increase the contact force of the contacts when at least one of the fixed contact and the movable contact melts and scatters. [Means for solving the problem]

[0006] An electromagnetic relay according to one aspect of the present invention includes a first fixed terminal, a first fixed contact, a second fixed terminal, a second fixed contact, a movable contact piece, a first movable contact, a second movable contact, a drive shaft, a drive unit, a contact case, and a guide wall. The first fixed contact is connected to the first fixed terminal. The second fixed contact is connected to the second fixed terminal and is spaced apart from the first fixed contact in a first direction. The movable contact piece has a first surface facing the first and second fixed contacts and a second surface opposite the first surface. The first movable contact is located on the first surface of the movable contact piece and faces the first fixed contact in a second direction including a contact direction toward the first fixed contact and a separation direction away from the first fixed contact. The second movable contact is located on the first surface of the movable contact piece and faces the second fixed contact. The drive shaft is connected to the movable contact piece. The drive unit moves the movable contact piece in the second direction via the drive shaft. The contact case houses the first fixed contact, the second fixed contact, the first movable contact, the second movable contact, and the movable contact piece. The contact case includes a first outer wall facing the first surface of the movable contact piece, a second outer wall facing the second surface of the movable contact piece, and a third outer wall disposed on the side of the movable contact piece and connected to the first and second outer walls. The guide wall is connected to the inner surface of the contact case. The guide wall guides a first airflow near the first fixed contact and the first movable contact, which is generated by a current flowing between the first fixed contact and the first movable contact, toward the second surface of the movable contact piece.

[0007] In this electromagnetic relay, for example, a first airflow generated by a short-circuit current flowing between the first fixed contact and the first movable contact is guided to the second surface of the movable contact piece by the guide wall. This causes the first airflow guided to the second surface to press the movable contact piece in the contact direction. As a result, the contact force of the first movable contact with the first fixed contact can be increased. In other words, even if at least one of the first fixed contact and the first movable contact melts and shatters, the contact force of the contacts can be increased.

[0008] The guide wall may include a first guide surface disposed to the side of the movable contact piece, extending from the inner surface of the third outer wall in the first direction and the separation direction, and inclined relative to the second surface of the movable contact piece. In this case, the first guide surface makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0009] The guide wall may include a second guide surface that extends from the inner surface of the second outer wall toward the movable contact piece and faces the first guide surface in the first direction. In this case, the first guide surface and the second guide surface make it easier to guide the first airflow to the second surface of the movable contact piece.

[0010] The second guide surface may be inclined relative to the second surface of the movable contact piece and may face the second surface of the movable contact piece in the second direction, in which case the second guide surface makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0011] The guide wall may be disposed on a side of the first fixed terminal, extend from the inner surface of the third outer wall toward the first fixed terminal in the second direction, and include a third guide surface facing the first guide surface in the second direction. 1 The airflow is more easily guided to the second surface of the movable contact piece.

[0012] The guide wall may include a third guide surface disposed to the side of the first fixed terminal and extending in the second direction from the inner surface of the third outer wall toward the first fixed terminal. In this case, the third guide surface makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0013] The third guide surface may extend from the inner surface of the third outer wall in the second direction and the contact direction and be inclined with respect to the second surface of the movable contact piece, which makes it easier for the first airflow to be guided to the second surface of the movable contact piece.

[0014] The guide wall may include a fourth guide surface disposed to the side of the movable contact piece, extending from the inner surface of the third outer wall in a third direction perpendicular to the first and second directions and in the separation direction, and inclined relative to the second surface of the movable contact piece. In this case, the fourth guide surface makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0015] The guide wall may include a fifth guide surface extending from the inner surface of the second outer wall toward the movable contact piece and facing the fourth guide surface in the third direction. In this case, the fifth guide surface makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0016] The fifth guide surface may be inclined with respect to the second surface of the movable contact piece and may face the second surface of the movable contact piece in the second direction, in which case the fifth guide surface makes it even easier to guide the first airflow to the second surface of the movable contact piece.

[0017] The guide wall may be disposed to the side of the first fixed terminal, extend in the third direction from the inner surface of the third outer wall toward the first fixed terminal, and include a sixth guide surface facing the fourth guide surface in the second direction. In this case, the sixth guide surface makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0018] The guide wall may include a sixth guide surface disposed to the side of the first fixed terminal and extending from the inner surface of the third outer wall toward the first fixed terminal in a third direction perpendicular to the first and second directions. In this case, the sixth guide surface further facilitates guiding the first airflow to the second surface of the movable contact piece.

[0019] The sixth guide surface may extend from the inner surface of the third outer wall in the third direction and the contact direction and be inclined with respect to the second surface of the movable contact piece, in which case the sixth guide surface further facilitates guiding the first airflow to the second surface of the movable contact piece.

[0020] The movable contact piece may have a dimension in a third direction perpendicular to the first and second directions that is smaller than a dimension of the first fixed terminal in the contact case in the third direction, in which case the first airflow is more likely to flow between the movable contact piece and the third outer wall in the third direction.

[0021] The movable contact piece may have a dimension in the second direction that is smaller than the distance from the first fixed terminal to the second fixed terminal inside the contact case, in which case the first airflow is more likely to flow between the movable contact piece and the third outer wall in the second direction.

[0022] The second surface of the movable contact piece may have a shape recessed toward the first outer wall, in which case the first airflow guided to the second surface can effectively press the movable contact piece in the contact direction.

[0023] The electromagnetic relay may further include an interlocking member that moves in conjunction with the movable contact piece. The interlocking member may be disposed on the second surface of the movable contact piece and have a shape that is recessed toward the second surface of the movable contact piece. In this case, the first airflow guided to the second surface can effectively press the movable contact piece in the contact direction via the interlocking member.

[0024] The first fixed terminal may include a contact support portion that supports the first fixed contact and an extension portion that extends from the contact support portion toward the third outer wall in a direction approaching the movable contact piece. In this case, the extension portion makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0025] The first fixed terminal may be a plate-shaped terminal and may include a contact support portion that supports the first fixed contact and a vertical portion that is disposed on a side of the movable contact piece and extends from the contact support portion toward the first guide surface. In this case, the vertical portion makes it easier to guide the first airflow to the second surface of the movable contact piece.

[0026] The contact case may be made of a material different from that of the guide wall, which increases the degree of freedom in design.

[0027] The guide wall may be made of resin. In this case, gas is generated from the guide wall due to an arc or a temperature rise inside the contact case. This increases the pressure inside the contact case, thereby promoting the flow of the first airflow.

[0028] The electromagnetic relay may further include a magnet portion that extends the arc generated between the first fixed contact and the first movable contact toward the guide wall, thereby enabling efficient control of the flow of the first airflow.

[0029] According to the present invention, the contact force of the contacts can be increased when at least one of the fixed contact and the movable contact melts and scatters. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 2 is a cross-sectional schematic view of an electromagnetic relay in an open state. [Figure 2] FIG. 2 is a cross-sectional view of an electromagnetic relay in a closed state. [Figure 3] FIG. 2 is a schematic diagram of a contact case viewed from above. [Figure 4] FIG. 4 is a cross-sectional view of the movable contact piece and its surroundings in a closed state. [Figure 5] 10A and 10B are diagrams illustrating modified examples of the guide wall. [Figure 6] 10A and 10B are diagrams illustrating modified examples of the guide wall. [Figure 7] 10A and 10B are diagrams illustrating modified examples of the guide wall. [Figure 8] 10A and 10B are diagrams illustrating modified examples of the guide wall. [Figure 9] 10A and 10B are diagrams illustrating modified examples of the guide wall. [Figure 10] 10A and 10B are diagrams illustrating modified examples of the guide wall. [Figure 11] 10A and 10B are diagrams illustrating modified examples of the guide wall. [Figure 12] 10A and 10B are diagrams illustrating modified examples of the movable contact piece. [Figure 13] FIG. 10 is a diagram for explaining a modified example of the electromagnetic relay. [Figure 14] 10A and 10B are diagrams illustrating modified examples of the first fixed terminal. [Figure 15] 10A and 10B are diagrams illustrating modified examples of the first fixed terminal. [Figure 16] 10A and 10B are diagrams illustrating modified examples of the contact case. [Figure 17] 10A and 10B are diagrams illustrating modified examples of the contact case. [Figure 18] FIG. 10 is a diagram for explaining a modified example of the electromagnetic relay. [Figure 19] FIG. 10 is a diagram for explaining a modified example of the electromagnetic relay. DETAILED DESCRIPTION OF THE INVENTION

[0031] An embodiment of an electromagnetic relay 100 according to one aspect of the present invention will be described below with reference to the drawings. Note that when referring to the drawings, the direction indicated by arrow Z is the up-down direction, the direction indicated by arrow Z1 is the up direction, the direction indicated by arrow Z2 is the down direction, the direction indicated by arrow X is the left-right direction, the direction indicated by arrow X1 is the left direction, the direction indicated by arrow X2 is the right direction, the direction indicated by arrow Y is the front-rear direction, the direction indicated by arrow Y1 is the forward direction, and the direction indicated by arrow Y2 is the backward direction. These directions are defined for the convenience of explanation and do not limit the arrangement direction of the electromagnetic relay 100.

[0032] In this embodiment, the left-right direction is an example of a first direction, and the up-down direction is an example of a second direction. In addition, the up direction is an example of a contact direction Z1, and the down direction is an example of a separation direction Z2. In this embodiment, the front-rear direction is an example of a third direction.

[0033] Fig. 1 is a schematic cross-sectional view of an electromagnetic relay 100 according to a first embodiment. As shown in Fig. 1, the electromagnetic relay 100 includes a contact case 2, a contact device 3, a drive device 4, and a guide wall 5 (see Fig. 4).

[0034] The contact case 2 has a substantially rectangular box shape and is made of an insulating material. The contact case 2 may be made of ceramic or a metal material such as aluminum.

[0035] Fig. 3 is a view of the contact case 2 as seen from above. As shown in Fig. 1 and Fig. 3, the contact case 2 includes a top wall 2a, a bottom wall 2b, and a side wall 2c. The top wall 2a, the bottom wall 2b, and the side wall 2c form a space for accommodating the contact device 3.

[0036] The top wall 2a is an example of a first outer wall. The bottom wall 2b is an example of a second outer wall. The side wall 2c is an example of a third outer wall. The top wall 2a and the bottom wall 2b are rectangular when viewed from the top-bottom direction, and extend in a direction perpendicular to the top-bottom direction. The bottom wall 2b is separated from the top wall 2a in the top-bottom direction. The bottom wall 2b is disposed below the top wall 2a and opposite the top wall 2a in the top-bottom direction.

[0037] The side wall 2c is disposed between the top wall 2a and the bottom wall 2b and is connected to the top wall 2a and the bottom wall 2b. The side wall 2c includes a left side wall 2d, a right side wall 2e, a front side wall 2f, and a rear side wall 2g. The left side wall 2d and the right side wall 2e extend in a direction perpendicular to the left-right direction. The left side wall 2d extends from the left end of the top wall 2a to the left end of the bottom wall 2b. The right side wall 2e faces the left side wall 2d in the left-right direction. The right side wall 2e extends from the right end of the top wall 2a to the right end of the bottom wall 2b. The front side wall 2f and the rear side wall 2g extend in a direction perpendicular to the front-to-rear direction. The front side wall 2f extends from the front end of the top wall 2a to the front end of the bottom wall 2b. The rear side wall 2g faces the front side wall 2f in the front-to-rear direction. The rear wall 2g extends from the rear end of the top wall 2a to the rear end of the bottom wall 2b.

[0038] The contact device 3 includes a first fixed terminal 6, a second fixed terminal 7, a first fixed contact 8, a second fixed contact 9, a movable contact piece 10, a first movable contact 11, a second movable contact 12, and a movable mechanism 13. The first fixed contact 8, the second fixed contact 9, the movable contact piece 10, the first movable contact 11, and the second movable contact 12 are housed in a contact case 2.

[0039] The first fixed terminal 6 and the second fixed terminal 7 are cylindrical terminals that extend in the vertical direction and extend from the inside to the outside of the contact case 2. The first fixed terminal 6 and the second fixed terminal 7 are made of a conductive material such as copper.

[0040] The first fixed terminal 6 includes a first contact support portion 6a and a first external connection portion 6b. The first contact support portion 6a is disposed within the contact case 2. The first contact support portion 6a extends in a direction perpendicular to the up-down direction. The first external connection portion 6b protrudes upward from the top wall 2a of the contact case 2 and is exposed to the outside of the contact case 2.

[0041] The second fixed terminal 7 is arranged apart from the first fixed terminal 6 in the left-right direction. The second fixed terminal 7 is arranged to the right of the first fixed terminal 6. The second fixed terminal 7 includes a second contact support portion 7a and a second external connection portion 7b. The second contact support portion 7a is arranged inside the contact case 2. The second contact support portion 7a extends in a direction perpendicular to the up-down direction. The second external connection portion 7b protrudes upward from the top wall 2a of the contact case 2 and is exposed to the outside of the contact case 2.

[0042] The first fixed contact 8 is made of a conductive material such as copper. The first fixed contact 8 is connected to the first fixed terminal 6. The first fixed contact 8 is supported by the first contact support portion 6a. The first fixed contact 8 protrudes downward from the lower surface of the first contact support portion 6a.

[0043] The second fixed contact 9 is made of a conductive material such as copper. The second fixed contact 9 is connected to the second fixed terminal 7. The second fixed contact 9 is supported by the second contact support portion 7a. The second fixed contact 9 protrudes downward from the lower surface of the second contact support portion 7a.

[0044] The movable contact piece 10 is a plate-like member that is long in one direction and extends in the left-right direction within the contact case 2. In this embodiment, the longitudinal direction of the movable contact piece 10 coincides with the left-right direction. The lateral direction of the movable contact piece 10 coincides with the front-rear direction. The movable contact piece 10 is made of a conductive material such as copper. The side wall 2c of the contact case 2 is arranged on the side of the movable contact piece 10.

[0045] The movable contact piece 10 is provided so as to be movable in a contact direction Z1 (here, an upward direction) in which the first movable contact 11 approaches the first fixed contact 8 and the second movable contact 12 approaches the second fixed contact 9, and in a separation direction Z2 (here, a downward direction) in which the first movable contact 11 moves away from the first fixed contact 8 and the second movable contact 12 moves away from the second fixed contact 9. That is, in this embodiment, the movable contact piece 10 is provided so as to be movable in the vertical direction.

[0046] The movable contact piece 10 includes a first surface 10a that faces the first fixed contact 8 and the second fixed contact 9 in the vertical direction, and a second surface 10b that is opposite the first surface 10a. The first surface 10a and the second surface 10b extend in a direction perpendicular to the vertical direction. The first surface 10a is disposed below the first fixed contact 8 and the second fixed contact 9. The first surface 10a faces the top wall 2a of the contact case 2 in the vertical direction. The first surface 10a faces the first fixed contact 8 and the second fixed contact 9 in the vertical direction. The first surface 10a is the upper surface of the movable contact piece 10, and the second surface 10b is the lower surface of the movable contact piece 10. The second surface 10b faces the bottom wall 2b of the contact case 2 in the vertical direction.

[0047] The movable contact piece 10 includes a through hole 10c. The through hole 10c is formed in the center of the movable contact piece 10. The through hole 10c has a hole shape that penetrates in the vertical direction.

[0048] The first movable contact 11 is connected to the movable contact piece 10. The first movable contact 11 is arranged on the first surface 10a of the movable contact piece 10 and faces the first fixed contact 8 in the vertical direction. The first movable contact 11 is arranged below the first fixed contact 8. The first movable contact 11 protrudes upward from the first surface 10a of the movable contact piece 10. The first movable contact 11 can come into contact with the first fixed contact 8 in response to movement of the movable contact piece 10. The first movable contact 11 is made of a conductive material such as copper.

[0049] The second movable contact 12 is connected to the movable contact piece 10. The second movable contact 12 is arranged on the first surface 10a of the movable contact piece 10 and faces the second fixed contact 9 in the vertical direction. The second movable contact 12 is arranged below the second fixed contact 9. The second movable contact 12 protrudes upward from the first surface 10a of the movable contact piece 10. The second movable contact 12 can come into contact with the second fixed contact 9 in response to movement of the movable contact piece 10. The second movable contact 12 is made of a conductive material such as copper.

[0050] The movable mechanism 13 supports the movable contact piece 10. The movable mechanism 13 includes a drive shaft 21, a first holding member 22, a second holding member 23, and a contact spring 24.

[0051] The drive shaft 21 is an axial member that passes through the through-hole 10c of the movable contact piece 10 in the vertical direction. The drive shaft 21 extends parallel to the vertical direction. The drive shaft 21 is provided so as to be movable in the vertical direction. The drive shaft 21 is connected to the movable contact piece 10 at the center of the movable contact piece 10 in the left-right and front-rear directions so as to be movable relative to the movable contact piece 10.

[0052] The first holding member 22 is fixed to the drive shaft 21 above the movable contact piece 10. The second holding member 23 is fixed to the drive shaft 21 below the movable contact piece 10. The contact spring 24 is arranged in a compressed state between the movable contact piece 10 and the second holding member 23. The contact spring 24 is a coil spring, and the drive shaft 21 is arranged on its inner periphery. The contact spring 24 urges the movable contact piece 10 in the contact direction Z1.

[0053] The drive device 4 is disposed below the contact device 3. The drive device 4 uses electromagnetic force to move the movable contact piece 10 in the vertical direction via the drive shaft 21 of the movable mechanism 13. The drive device 4 includes a coil 31, a movable iron core 32, a fixed iron core 33, a yoke 34, and a return spring 35.

[0054] When a voltage is applied to the coil 31 and it is excited, it generates an electromagnetic force that moves the movable iron core 32 in the contact direction Z1. The movable iron core 32 is connected to the drive shaft 21 so as to be movable integrally therewith. The fixed iron core 33 is disposed in a position facing the movable iron core 32. The yoke 34 is disposed so as to surround the coil 31. The return spring 35 is disposed between the movable iron core 32 and the fixed iron core 33. The return spring 35 biases the movable iron core 32 in the separation direction Z2.

[0055] 1 shows the state in which the drive unit 4 is not energized. When the drive unit 4 is not energized, the first movable contact 11 is separated from the first fixed contact 8, and the second movable contact 12 is separated from the second fixed contact 9.

[0056] FIG. 2 shows the state when the drive unit 4 is excited and the movable mechanism 13 moves in the contact direction Z1. When the drive unit 4 is excited, the movable core 32 moves in the contact direction Z1 together with the drive shaft 21. As the drive shaft 21 moves in the contact direction Z1, the second holding member 23 compresses the contact spring 24. This increases the force pressing the movable contact piece 10 in the contact direction Z1, causing the movable contact piece 10 to move in the contact direction Z1, with the first movable contact 11 contacting the first fixed contact 8 and the second movable contact 12 contacting the second fixed contact 9. Hereinafter, the state in which the first movable contact 11 contacts the first fixed contact 8 and the second movable contact 12 contacts the second fixed contact 9 is referred to as the closed state. In the closed state, the first holding member 22 is vertically spaced apart from the movable contact piece 10.

[0057] FIG. 4 is a diagram illustrating the flow of the first air current near the first fixed contact 8 and the first movable contact 11, which is generated due to the current flowing between the first fixed contact 8 and the first movable contact 11. FIG. 4 is a schematic cross-sectional view of the periphery of the movable contact piece 10, cut along a plane perpendicular to the front-rear direction. The guide wall 5 is disposed within the contact case 2. The guide wall 5 is connected to the inner surface of the contact case 2. In this embodiment, the guide wall 5 is integral with the contact case 2 and is configured as a single member together with the contact case 2. Note that the movable mechanism 13 is not shown in FIG. 4 and subsequent figures.

[0058] The guide wall 5 guides the first airflow toward the second surface 10b of the movable contact piece 10. The guide wall 5 includes a first guide surface 41, a second guide surface 42, and a third guide surface 43. The first to third guide surfaces 41 to 43 guide the first airflow flowing toward the left side wall 2d toward the second surface 10b of the movable contact piece 10. In FIG. 4, the flow of the first airflow flowing toward the left side wall 2d is schematically indicated by arrows. Note that the guide wall 5 is not shown in FIGS. 1 and 2.

[0059] The first airflow is generated due to melting or scattering of the first fixed contact 8 and the first movable contact 11, or due to arcing occurring between the first fixed contact 8 and the first movable contact 11. The first airflow is also generated due to an increase in pressure caused by an increase in temperature of the air near the first fixed contact 8 and the first movable contact 11.

[0060] The first to third guide surfaces 41 to 43 are inclined with respect to the second surface 10b of the movable contact piece 10 in a cross section perpendicular to the front-rear direction. The first to third guide surfaces 41 to 43 are disposed to the left of the center of the movable contact piece 10 in the left-right direction.

[0061] The first guide surface 41 is located to the left of the movable contact piece 10 inside the contact case 2. The first guide surface 41 is located at a position overlapping the movable contact piece 10 in the left-right direction. The first guide surface 41 extends in the front-rear direction. The first guide surface 41 is connected to the left side wall 2d and the bottom wall 2b. The first guide surface 41 extends from the inner surface of the left side wall 2d in the left-right direction and in the separation direction Z2. The first guide surface 41 extends from the inner surface of the left side wall 2d downwards from the movable contact piece 10 to the bottom wall 2b.

[0062] The upper end of the first guide surface 41 is connected to the left side wall 2d. In the closed state, the upper end of the first guide surface 41 is located above the movable contact piece 10. The lower end of the first guide surface 41 is connected to the bottom wall 2b. The lower end of the first guide surface 41 is located near below the left end of the movable contact piece 10. The upper end of the first guide surface 41 is located to the left of the lower end, and extends from the upper end to the lower end in a direction approaching the center of the movable contact piece 10 in the left-right direction. The front end of the first guide surface 41 is connected to the front side wall 2f. The rear end of the first guide surface 41 is connected to the rear side wall 2g.

[0063] The first airflow that hits the first guide surface 41 is guided below the movable contact piece 10 by the first guide surface 41 and is led to the second surface 10b of the movable contact piece 10.

[0064] The second guide surface 42 is disposed below the movable contact piece 10 within the contact case 2. The second guide surface 42 is disposed at a position overlapping the second surface 10b of the movable contact piece 10 in the vertical direction. The second guide surface 42 is disposed at a position overlapping the first movable contact 11 of the movable contact piece 10 in the vertical direction. The second guide surface 42 is separated from the first guide surface 41 in the left-right direction. The second guide surface 42 is disposed to the right of the first guide surface 41 and faces the first guide surface 41 in the left-right direction. The second guide surface 42 extends in the front-rear direction.

[0065] The second guide surface 42 extends from the bottom wall 2b of the contact case 2 toward the second surface 10b of the movable contact piece 10. The second guide surface 42 faces the second surface 10b of the movable contact piece 10 in the vertical direction. The lower end of the second guide surface 42 is connected to the bottom wall 2b. The upper end of the second guide surface 42 is located to the right of the lower end, and extends from the lower end to the upper end in a direction approaching the center of the movable contact piece 10 in the horizontal direction. The front end of the second guide surface 42 is connected to the front side wall 2f. The rear end of the second guide surface 42 is connected to the rear side wall 2g.

[0066] The second guide surface 42 pushes up the first airflow guided below the movable contact piece 10 by the first guide surface 41 toward the second surface 10b of the movable contact piece 10. In other words, the first airflow guided below the movable contact piece 10 by the first guide surface 41 is easily guided to the second surface 10b of the movable contact piece 10 by the second guide surface 42.

[0067] The third guide surface 43 is disposed to the left of the first fixed terminal 6 within the contact case 2. The third guide surface 43 is disposed above the first guide surface 41 and faces the first guide surface 41 in the up-down direction. The third guide surface 43 extends in the left-right direction from the inner surface of the left side wall 2d toward the first fixed terminal 6. The third guide surface 43 extends in the left-right direction and in the contact direction Z1 from the inner surface of the left side wall 2d and is inclined with respect to the second surface 10b of the movable contact piece 10. The third guide surface 43 is connected to the left side wall 2d and the top wall 2a. The third guide surface 43 extends in the front-rear direction.

[0068] The upper end of the third guide surface 43 is connected to the top wall 2a. The lower end of the third guide surface 43 is connected to the left side wall 2d. The lower end of the third guide surface 43 is located near the left of the lower end of the first fixed contact 8. The upper end of the third guide surface 43 is located to the right of the lower end, and extends from the lower end to the upper end in a direction approaching the center of the movable contact piece 10 in the left-right direction. The front end of the third guide surface 43 is connected to the front side wall 2f. The rear end of the third guide surface 43 is connected to the rear side wall 2g.

[0069] The third guide surface 43 guides the first airflow flowing toward the left side wall 2d toward the first guide surface 41. That is, the first airflow that hits the third guide surface 43 flows toward the first guide surface 41. As a result, the first airflow that hits the third guide surface 43 is guided below the movable contact piece 10 by the first guide surface 41, and is led to the second surface 10b of the movable contact piece 10.

[0070] The guide wall 5 further includes a first guide surface 51, a second guide surface 52, and a third guide surface 53. The first to third guide surfaces 51 to 53 guide the second airflow near the second fixed contact 9 and the second movable contact 12, which is generated due to a current flowing between the second fixed contact 9 and the second movable contact 12, toward the second surface 10b of the movable contact piece 10. More specifically, the first to third guide surfaces 51 to 53 guide the second airflow flowing toward the right side wall 2e toward the second surface 10b of the movable contact piece 10.

[0071] The first to third guide surfaces 51 to 53 are symmetrical to the first guide surfaces 41 to 43 with respect to the drive shaft 21. A detailed description of the first guide surfaces 51 to 53 will be omitted.

[0072] In the electromagnetic relay 100 configured as described above, for example, the first airflow generated due to a short-circuit current flowing between the first fixed contact 8 and the first movable contact 11 is guided to the second surface 10b of the movable contact piece 10 by the first to third guide surfaces 41 to 43 of the guide wall 5. As a result, the first airflow guided to the second surface 10b presses the movable contact piece 10 in the contact direction Z1. As a result, the contact force of the first movable contact 11 with the first fixed contact 8 can be increased. In other words, the contact force of the contacts can be increased even when at least one of the first fixed contact 8 and the first movable contact 11 melts and scatters.

[0073] Furthermore, for example, a second airflow generated due to a short-circuit current flowing between the second fixed contact 9 and the second movable contact 12 is guided to the second surface 10b of the movable contact piece 10 by the first to third guide surfaces 51 to 53. As a result, the second airflow guided to the second surface 10b presses the movable contact piece 10 in the contact direction Z1. As a result, the contact force of the second movable contact 12 with the second fixed contact 9 can be increased.

[0074] In this embodiment, during normal disconnection (transition from the closed state to the open state), the first airflow and the second airflow may slow down the opening speed of the contacts. Therefore, it is preferable to provide a structure for venting the first airflow and the second airflow, for example, a flow path that opens and closes in response to the movement of the movable mechanism 13, or a space created by the movement of the movable iron core 32 during disconnection.

[0075] The above describes an embodiment of an electromagnetic relay according to one aspect of the present invention, but the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the gist of the invention.

[0076] In the drawings described below, the same components as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment. Fig. 5 is a schematic cross-sectional view of the periphery of the first fixed contact 8 of the electromagnetic relay 100 according to the first modification, cut along a plane perpendicular to the left-right direction, as viewed from the left side. In Fig. 5, the flow of the first air current flowing toward the front wall 2f and the rear wall 2g is schematically indicated by arrows.

[0077] The guide wall 5 of the electromagnetic relay 100 according to the first modification includes fourth guide surfaces 61, 71, fifth guide surfaces 62, 72, and sixth guide surfaces 63, 73. Note that the guide wall 5 of the electromagnetic relay 100 according to the first modification does not have the first guide surfaces 41, 51, the second guide surfaces 42, 52, or the third guide surfaces 43, 53.

[0078] The fourth to sixth guide surfaces 61 to 63 guide the first airflow flowing toward the front wall 2f toward the second surface 10b of the movable contact piece 10. The fourth to sixth guide surfaces 61 to 63 are inclined with respect to the second surface 10b of the movable contact piece 10 in a cross-sectional view perpendicular to the left-right direction. The fourth to sixth guide surfaces 61 to 63 are disposed forward of the center of the movable contact piece 10 in the front-rear direction.

[0079] The fourth guide surface 61 is disposed in front of the movable contact piece 10 within the contact case 2. The fourth guide surface 61 is disposed at a position overlapping the movable contact piece 10 in the front-rear direction. The fourth guide surface 61 extends in the left-right direction. The fourth guide surface 61 is connected to the front wall 2f and the bottom wall 2b. The fourth guide surface 61 extends from the inner surface of the front wall 2f in the front-rear direction and in the separation direction Z2. The fourth guide surface 61 extends from the inner surface of the front wall 2f downwardly of the movable contact piece 10 to the bottom wall 2b.

[0080] The upper end of the fourth guide surface 61 is connected to the front wall 2f. In the closed state, the upper end of the fourth guide surface 61 is located above the movable contact piece 10. The lower end of the fourth guide surface 61 is connected to the bottom wall 2b. The lower end of the fourth guide surface 61 is located near below the front end of the movable contact piece 10. The upper end of the fourth guide surface 61 is located further forward than the lower end, and extends from the upper end to the lower end in a direction approaching the center of the movable contact piece 10 in the front-to-rear direction. The left end of the fourth guide surface 61 is connected to the left side wall 2d. The right end of the fourth guide surface 61 is connected to the right side wall 2e.

[0081] The fifth guide surface 62 pushes the first airflow, guided below the movable contact piece 10 by the fourth guide surface 61, upward toward the second surface 10b of the movable contact piece 10. The fifth guide surface 62 is disposed below the movable contact piece 10 within the contact case 2. The fifth guide surface 62 is disposed so as to overlap the second surface 10b of the movable contact piece 10 in the vertical direction. The fifth guide surface 62 is disposed so as to overlap the first movable contact 11 of the movable contact piece 10 in the vertical direction. The fifth guide surface 62 is separated from the fourth guide surface 61 in the front-rear direction. The fifth guide surface 62 is disposed behind the fourth guide surface 61 and faces the fourth guide surface 61 in the front-rear direction. The fifth guide surface 62 extends in the left-right direction except for the portion where the drive shaft 21 is disposed. In other words, the fifth guide surface 62 is disposed so as to overlap the second movable contact 12 in the vertical direction.

[0082] The fifth guide surface 62 extends from the inner surface of the bottom wall 2b toward the second surface 10b of the movable contact piece 10. The fifth guide surface 62 faces the second surface 10b of the movable contact piece 10 in the vertical direction. The lower end of the fifth guide surface 62 is connected to the bottom wall 2b. The upper end of the second guide surface 42 is located to the left of the lower end, and extends from the lower end to the upper end in a direction approaching the center of the movable contact piece 10 in the front-to-rear direction.

[0083] The sixth guide surface 63 guides the first airflow flowing toward the front wall 2f toward the fourth guide surface 61. The sixth guide surface 63 is disposed in front of the first fixed terminal 6 inside the contact case 2. The sixth guide surface 63 extends in the left-right direction. The sixth guide surface 63 is connected to the front wall 2f and the top wall 2a. The sixth guide surface 63 extends in the front-rear direction from the inner surface of the front wall 2f toward the first fixed terminal 6. The sixth guide surface 63 extends in the front-rear direction and in the contact direction Z1 from the inner surface of the front wall 2f.

[0084] The upper end of the sixth guide surface 63 is connected to the top wall 2a. The lower end of the sixth guide surface 63 is connected to the front wall 2f. The lower end of the sixth guide surface 63 is located near the front of the lower end of the first fixed contact 8. The upper end of the sixth guide surface 63 is located rearward of the lower end, and extends from the lower end to the upper end in a direction approaching the center of the movable contact piece 10 in the front-to-rear direction. The left end of the sixth guide surface 63 is connected to the left side wall 2d. The right end of the sixth guide surface 63 is connected to the right side wall 2e.

[0085] The fourth to sixth guide surfaces 71 to 73 guide the first airflow flowing toward the rear wall 2g toward the second surface 10b of the movable contact piece 10. The fourth to sixth guide surfaces 71 to 73 are symmetrical in the front-to-back direction to the fourth to sixth guide surfaces 61 to 63. A detailed description of the fourth to sixth guide surfaces 71 to 73 will be omitted.

[0086] In the electromagnetic relay 100 according to the first modification, the first airflow is guided to the second surface 10b of the movable contact piece 10 by the fourth guide surfaces 61, 71, the fifth guide surfaces 62, 72, and the sixth guide surfaces 63, 73, thereby increasing the contact force of the first movable contact 11 with the first fixed contact 8. Furthermore, the second airflow is guided to the second surface 10b of the movable contact piece 10 by the fourth guide surfaces 61, 71, the fifth guide surfaces 62, 72, and the sixth guide surfaces 63, 73, thereby increasing the contact force of the second movable contact 12 with the second fixed contact 9.

[0087] 6 is a schematic cross-sectional view of the periphery of first fixed contact 8 of electromagnetic relay 100 according to the second modification, cut along a plane perpendicular to the left-right direction, as viewed from the left. Guide wall 5 of electromagnetic relay 100 according to the second modification is a combination of guide wall 5 according to the first embodiment and guide wall 5 according to the first modification. That is, guide wall 5 of electromagnetic relay 100 according to the second modification includes first guide surfaces 41, 51, second guide surfaces 42, 52, third guide surfaces 43, 53, fourth guide surfaces 61, 71, fifth guide surfaces 62, 72, and sixth guide surfaces 63, 73.

[0088] In the guide wall 5 of the electromagnetic relay 100 according to the second modification, the fifth guide surfaces 62, 72 may be omitted. Alternatively, the second guide surfaces 42, 52 may be omitted. That is, the combination of the first guide surfaces 41, 51, the second guide surfaces 42, 52, the third guide surfaces 43, 53, the fourth guide surfaces 61, 71, the fifth guide surfaces 62, 72, and the sixth guide surfaces 63, 73 may be changed as appropriate.

[0089] For example, in the first embodiment, the second guide surfaces 42, 52 may be omitted. In the first embodiment, the guide wall 5 only needs to have at least one of the first guide surface 41 and the third guide surface 43. In the guide wall 5 according to the first modified example, the fifth guide surfaces 62, 72 may be omitted, and at least one of the fourth guide surface 61 and the sixth guide surface 63 may be included.

[0090] The shapes of the third guide surfaces 43, 53 and the sixth guide surfaces 63, 73 may be modified. For example, the third guide surfaces 43, 53 and the sixth guide surfaces 63, 73 may have shapes that narrow the spaces to the sides of the first fixed terminal 6 and the second fixed terminal 7 within the contact case 2. For example, as shown in FIG. 7, the third guide surfaces 43, 53 and the sixth guide surfaces 63, 73 may have a thickness in the vertical direction. Furthermore, as shown in FIG. 8, the third guide surfaces 43, 53 and the sixth guide surfaces 63, 73 may be configured as flat surfaces perpendicular to the vertical direction. Furthermore, as shown in FIG. 9, the third guide surfaces 43, 53 and the sixth guide surfaces 63, 73 may be configured as stepped portions that protrude from the side wall 2c toward the first fixed terminal 6 and the second fixed terminal 7 within the contact case 2.

[0091] The shapes of the second guide surfaces 42, 52 and the fifth guide surfaces 62, 72 may be changed. For example, as shown in Fig. 10, the fifth guide surfaces 62, 72 may be formed as planes perpendicular to the front-to-rear direction. Similarly, the second guide surfaces 42, 52 may be formed as planes perpendicular to the left-to-right direction.

[0092] The shape of the movable contact piece 10 may be changed. As shown in Fig. 11, the dimension of the movable contact piece 10 in the front-rear direction may be smaller than the dimension of the first fixed terminal 6 in the front-rear direction within the contact case 2. Alternatively, as shown in Fig. 4, the dimension of the movable contact piece 10 in the left-right direction may be smaller than the distance from the left end of the first fixed terminal 6 to the right end of the second fixed terminal 7. In this case, the first airflow and the second airflow are more easily guided to the second surface 10b of the movable contact piece 10.

[0093] 12, the movable contact piece 10 may have a recessed shape (concave portion) on the second surface 10b. The concave portion of the movable contact piece 10 is formed at a position that overlaps at least the first movable contact 11 and the second movable contact 12 in the vertical direction.

[0094] As shown in FIG. 13 , the electromagnetic relay 100 may further include an interlocking member 76 that moves in conjunction with the movable contact piece 10. The interlocking member 76 is disposed on the second surface 10b of the movable contact piece 10. The interlocking member 76 has a shape that is recessed toward the second surface 10b of the movable contact piece 10. That is, the lower surface of the interlocking member 76 has a shape (recess) that is recessed from bottom to top. In this case, for example, the first airflow may press the movable contact piece 10 in the contact direction Z1 via the interlocking member 76. That is, the first airflow and the second airflow guided toward the second surface 10b of the movable contact piece 10 by the guide wall 5 may indirectly press the movable contact piece 10 in the contact direction Z1. Alternatively, the guide wall 5 may be configured so that in addition to the second surface 10b of the movable contact piece 10, components such as the second retaining member 23 arranged below the movable contact piece 10 and a holder that holds the movable contact piece 10 are pressed in the contact direction Z1 by the first air flow and the second air flow.

[0095] The first fixed terminal 6 and the second fixed terminal 7 may be plate-shaped terminals. In that case, for example, as shown in Fig. 14, they may include extensions 6c extending in the front-rear direction from both ends of the first contact support portion 6a in the front-rear direction. The extensions 6c extend from the first contact support portion 6a toward the side wall 2c in a direction approaching the movable contact piece 10. The extensions 6c may be provided at the left end of the first contact support portion 6a.

[0096] The first fixed terminal 6 and the second fixed terminal 7 may have a curved shape. For example, as shown in FIG. 15, the first fixed terminal 6 may include a vertical portion 6d. The vertical portion 6d is arranged on the side of the movable contact piece 10. The vertical portion 6d extends from the first contact support portion 6a toward the first guide surface 41. The vertical portion 6d extends upward within the contact case 2 from the left end of the first contact support portion 6a. The vertical portion 6d guides the first airflow toward the second surface 10b of the movable contact piece 10. In the example shown in FIG. 15, the first guide surface 41 and the second guide surface 42 are arranged on the top wall 2a. The vertical portion 6d is connected to the first guide surface 41.

[0097] The contact case 2 may be formed by combining a plurality of members. For example, as shown in Fig. 16, the contact case 2 may be configured by combining a plurality of divided members. For example, the contact case 2 may be configured by combining members divided in the vertical direction. Alternatively, the contact case 2 may be configured by parts divided in the left-right direction or the front-rear direction.

[0098] 17, the guide wall 5 may be separate from the contact case 2. The contact case 2 and the guide wall 5 may be made of different materials. For example, the contact case 2 may be made of ceramic or metal, and the guide wall 5 may be made of resin.

[0099] In the above embodiment, the contact case 2 has a rectangular shape when viewed from above, but the contact case 2 may have a circular or elliptical shape when viewed from above.

[0100] As shown in FIG. 18 , the electromagnetic relay 100 according to the first embodiment may further include a magnet unit 80. The magnet unit 80 generates a magnetic field for extending the first arc generated between the first fixed contact 8 and the first movable contact 11 and the second arc generated between the second fixed contact 9 and the second movable contact 12. The magnet unit 80 is disposed on the outer surface of the side wall 2c of the contact case 2. The magnet unit 80 includes a first magnet 80a and a second magnet 80b. The first magnet 80a and the second magnet 80b are, for example, permanent magnets. The first magnet 80a and the second magnet 80b are disposed so that their opposite poles face each other in the front-rear direction. In the example shown in FIG. 17 , the north pole of the first magnet 80a faces the front wall 2f. The south pole of the second magnet 80b faces the rear wall 2g.

[0101] When a current flows from the first movable contact 11 to the first fixed contact 8, a Lorentz force F1 acts on the first arc in a direction toward the left side wall 2d. That is, the first arc extends toward the first guide surface 41 and the third guide surface 43. Because the first guide surface 41 and the third guide surface 43 are provided in the direction in which the first arc extends, the flow of the first airflow can be effectively controlled. Furthermore, because a Lorentz force F2 acts on the second arc in a direction toward the right side wall 2e, the flow of the second airflow can be effectively controlled by the first guide surface 51 and the third guide surface 53. The electromagnetic relay 100 according to the second modification may also further include a magnet unit 80.

[0102] As shown in FIG. 19 , the electromagnetic relay 100 according to the first modification may further include a magnet unit 90. The magnet unit 90 generates a magnetic field for extending the first and second arcs. The magnet unit 90 is arranged so that a Lorentz force acts on the first and second arcs in the short direction of the movable contact piece 10. The magnet unit 90 is arranged on the outer surface of the side wall 2c of the contact case 2. The magnet unit 90 includes a first magnet 90a and a second magnet 90b. The first magnet 90a and the second magnet 90b are, for example, permanent magnets. The first magnet 90a and the second magnet 90b are arranged so that their opposite poles face each other in the left-right direction. In the embodiment shown in FIG. 18 , the north pole of the first magnet 90a faces the left side wall 2d. The south pole of the second magnet 90b faces the right side wall 2e.

[0103] When a current flows from the first fixed contact 8 to the first movable contact 11, a Lorentz force F3 acts on the first arc in a direction toward the front wall 2f. That is, the first arc is extended toward the fourth guide surface 61 and the sixth guide surface 63. A Lorentz force F4 acts on the second arc in a direction toward the rear wall 2g. That is, the second arc is extended toward the fourth guide surface 71 and the sixth guide surface 73. When the current flows in the opposite direction (from the first movable contact 11 to the first fixed contact 8), a Lorentz force F5 acts on the first arc in a direction toward the rear wall 2g, and a Lorentz force F6 acts on the second arc in a direction toward the front wall 2f. The first magnet 90a and the second magnet 90b may be arranged so that the same poles face each other in the left-right direction. The electromagnetic relay 100 according to the second modification may also further include a magnet unit 90.

[0104] The first fixed contact 8 and the first movable contact 11 may be formed of different materials. The second fixed contact 9 and the second movable contact 12 may be formed of different materials. The first movable contact 11 and the second movable contact 12 may be embedded in the movable contact piece 10. That is, the first movable contact 11 and the second movable contact 12 do not have to protrude upward from the movable contact piece 10. When the first movable contact 11 and the second movable contact 12 protrude upward from the movable contact piece 10, the first fixed contact 8 may be embedded in the first contact support portion 6a of the first fixed terminal 6, and the second fixed contact 9 may be embedded in the second contact support portion 7a of the second fixed terminal 7. [Explanation of symbols]

[0105] 2 Contact Case 2a Ceiling wall (example of the first exterior wall) 2b Bottom wall (example of the second exterior wall) 2c Side wall (example of the third exterior wall) 4. Drive unit 5 Guide Wall 6 1st fixed terminal 7 Second fixed terminal 8 1st fixed contact 9 Second fixed contact 10 Movable contact piece 11 1st movable contact 12 2nd movable contact + 21 Drive shaft 24 Contact spring 41 First guide surface 42 Second guide surface 43 Third guide surface 61 4th guide surface 62 5th guide surface 63 6th guide surface 100 Electromagnetic relay X 1st direction Z 2nd direction Z1 Contact direction Z2 Opening direction Y Third direction

Claims

1. a first fixed terminal; a first fixed contact connected to the first fixed terminal; A second fixed terminal; a second fixed contact connected to the second fixed terminal and spaced apart from the first fixed terminal in a first direction; a movable contact piece including a first surface facing the first fixed contact and the second fixed contact, and a second surface opposite to the first surface; a first movable contact arranged on the first surface of the movable contact piece and facing the first fixed contact in a second direction including a contact direction approaching the first fixed contact and a separation direction separating from the first fixed contact; a second movable contact disposed on the first surface of the movable contact piece and facing the second fixed contact; a drive shaft connected to the movable contact piece; a drive device that moves the movable contact piece in the second direction via the drive shaft; a contact case including a first outer wall facing the first surface of the movable contact piece, a second outer wall facing the second surface of the movable contact piece, and a third outer wall disposed on a side of the movable contact piece and connected to the first outer wall and the second outer wall, and accommodating the first fixed contact, the second fixed contact, the first movable contact, the second movable contact, and the movable contact piece; a guide wall connected to an inner surface of the contact case, the guide wall guiding a first airflow near the first fixed contact and the first movable contact, which is generated due to a current flowing between the first fixed contact and the first movable contact, toward the second surface of the movable contact piece; An electromagnetic relay comprising:

2. the guide wall is disposed on a side of the movable contact piece, and includes a first guide surface that extends from an inner surface of the third outer wall in the first direction and the separation direction and is inclined with respect to the second surface of the movable contact piece.

2. The electromagnetic relay according to claim 1.

3. the guide wall includes a second guide surface that extends from the inner surface of the second outer wall toward the movable contact piece and faces the first guide surface in the first direction; 3. The electromagnetic relay according to claim 2.

4. the second guide surface is inclined with respect to the second surface of the movable contact piece and faces the second surface of the movable contact piece in the second direction; 4. The electromagnetic relay according to claim 3.

5. the guide wall is disposed to a side of the first fixed terminal, extends in the second direction from an inner surface of the third outer wall toward the first fixed terminal, and includes a third guide surface facing the first guide surface in the second direction.

5. An electromagnetic relay according to claim 2.

6. the guide wall includes a third guide surface disposed laterally of the first fixed terminal and extending in a second direction from an inner surface of the third outer wall toward the first fixed terminal; 5. An electromagnetic relay according to claim 1.

7. the third guide surface extends from an inner surface of the third outer wall in the second direction and the contact direction and is inclined with respect to the second surface of the movable contact piece; 7. An electromagnetic relay according to claim 5 or 6.

8. the guide wall is disposed on a side of the movable contact piece, and includes a fourth guide surface that extends from an inner surface of the third outer wall in a third direction perpendicular to the first direction and the second direction and in the separation direction, and is inclined with respect to the second outer wall.

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

9. the guide wall extends from the inner surface of the second outer wall toward the movable contact piece and includes a fifth guide surface facing the fourth guide surface in the third direction.

9. The electromagnetic relay according to claim 8.

10. the fifth guide surface is inclined with respect to the second surface of the movable contact piece and faces the second surface of the movable contact piece in the second direction; 10. The electromagnetic relay according to claim 9.

11. the guide wall is disposed to a side of the first fixed terminal, extends from an inner surface of the third outer wall toward the first fixed terminal in the third direction, and includes a sixth guide surface facing the fourth guide surface in the second direction.

11. An electromagnetic relay according to any one of claims 8 to 10.

12. the guide wall includes a sixth guide surface disposed to a side of the first fixed terminal and extending from an inner surface of the third outer wall toward the first fixed terminal in a third direction perpendicular to the first direction and the second direction; 11. An electromagnetic relay according to any one of claims 1 to 10.

13. the sixth guide surface extends from an inner surface of the third outer wall in the third direction and the contact direction, and is inclined with respect to the second surface of the movable contact piece.

13. An electromagnetic relay according to claim 11 or 12.

14. the movable contact piece has a dimension in a third direction perpendicular to the first direction and the second direction that is smaller than a dimension of the first fixed terminal in the contact case in the third direction; 14. An electromagnetic relay according to any one of claims 1 to 13.

15. the movable contact piece has a dimension in the second direction that is smaller than a distance from the first fixed terminal to the second fixed terminal in the contact case; 15. An electromagnetic relay according to any one of claims 1 to 14.

16. The second surface of the movable contact piece has a shape recessed toward the first outer wall.

16. An electromagnetic relay according to any one of claims 1 to 15.

17. a linking member disposed on the second surface of the movable contact piece and moving in conjunction with the movable contact piece; The interlocking member has a shape recessed toward the second surface of the movable contact piece.

17. An electromagnetic relay according to any one of claims 1 to 16.

18. The first fixed terminal includes a contact support portion that supports the first fixed contact, and an extension portion that extends from the contact support portion toward the third outer wall in a direction approaching the movable contact piece.

18. An electromagnetic relay according to any one of claims 1 to 17.

19. The first fixed terminal is a plate-shaped terminal and includes a contact support portion that supports the first fixed contact, and a vertical portion that is disposed on a side of the movable contact piece and extends from the contact support portion toward the first guide surface.

6. An electromagnetic relay according to any one of claims 2 to 5.

20. The contact case is formed of a material different from that of the guide wall.

20. An electromagnetic relay according to any one of claims 1 to 19.

21. The guide wall is made of resin.

21. The electromagnetic relay according to claim 20.

22. a magnet portion that extends an arc generated between the first fixed contact and the first movable contact toward the guide wall; 22. An electromagnetic relay according to any one of claims 1 to 21.

Images