Electromagnetic relay

Abstract

The present invention addresses the problem of suppressing an increase in the temperature of a filler filled in an outer housing. An electromagnetic relay (A1) is provided with a fixed terminal (60), a movable contact (50), an inner housing (20), a yoke (72), an outer housing (10), and a first filler (81). The movable contact (50) is disposed below the fixed terminal (60) and is in contact with the fixed terminal (60). The inner housing (20) accommodates the movable contact (50) and has an opening in the lower portion. The yoke (72) is disposed below the inner housing (20) so as to cover the opening portion of the inner housing (20). The outer housing (10) accommodates the inner housing (20). The first filler (81) is filled between the inner case (20) and the outer case (10). The first filler (81) is filled up to a position above the lower surface (73) of the yoke (72).

Description

Technical Field

[0001] The present disclosure generally relates to an electromagnetic relay, and more particularly to an electromagnetic relay having a housing filled with a filling material. Background Art

[0002] Conventionally, there are electromagnetic relays that house a coil, a yoke, a movable contact, a fixed contact, etc. in an outer case. In such electromagnetic relays, a filling material is sometimes filled into the outer case for the purpose of bonding, protection, insulation, etc.

[0003] However, there is a case where the temperature of the filling material excessively rises due to heat generated inside the outer case or the like, and a problem occurs in the electromagnetic relay.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2022-170571 Summary of the invention

[0007] An object of the present disclosure is to provide an electromagnetic relay capable of suppressing a temperature increase of a filling material filled in a housing.

[0008] An electromagnetic relay of one embodiment of the present disclosure comprises a fixed terminal, a movable contact, an inner housing, a yoke, an outer housing and a first filling material. The movable contact is arranged below the fixed terminal and contacts the fixed terminal. The inner housing accommodates the movable contact and is open at the bottom. The yoke is arranged below the inner housing in a manner covering the opening portion of the inner housing. The outer housing accommodates the inner housing. The first filling material is filled between the inner housing and the outer housing. The first filling material is filled to a position above the lower surface of the yoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic cross-sectional view showing the electromagnetic relay according to the first embodiment.

[0010] Figure 2 It is a perspective view showing the electromagnetic relay according to the first embodiment.

[0011] Figure 3 It is a cross-sectional view showing the electromagnetic relay according to the first embodiment.

[0012] Figure 4 This is another cross-sectional view showing the electromagnetic relay according to the first embodiment.

[0013] Figure 5This is a perspective view showing a state in which a part of the outer shell of the electromagnetic relay according to the first embodiment is removed.

[0014] Figure 6 It is a schematic cross-sectional view showing an electromagnetic relay according to the second embodiment.

[0015] Figure 7 It is a cross-sectional view showing an electromagnetic relay according to a second embodiment.

[0016] Figure 8 It is a schematic cross-sectional view showing an electromagnetic relay according to a third embodiment.

[0017] Fig. 9 It is a cross-sectional view showing an electromagnetic relay according to a fourth embodiment. DETAILED DESCRIPTION

[0018] The present disclosure generally relates to an electromagnetic relay. More specifically, the present disclosure relates to an electromagnetic relay having a housing filled with a filling material.

[0019] In addition, the embodiment described below is only an example of an embodiment of the present disclosure. The present disclosure is not limited to the following embodiments, and various changes can be made according to the design, etc. as long as the effects of the present disclosure can be achieved. In addition, in the following description, unless otherwise specified, the first direction D1, the second direction D2, and the third direction D3 indicated by arrows in the accompanying drawings are specified as the up-down direction, the left-right direction, and the front-back direction of the electromagnetic relays A1 to A4. However, the up-down direction, the left-right direction, and the front-back direction are conveniently used to help understand the description of the embodiment, and the directions when the electromagnetic relays A1 to A4 are not actually specified. In addition, the arrows indicating "D1", "D2", and "D3" in the accompanying drawings are only marked for explanation and are not accompanied by entities.

[0020] (Implementation Method 1)

[0021] (1) Summary

[0022] First, refer to Figure 1 The outline of electromagnetic relay A1 according to the first embodiment will be described.

[0023] like Figure 1 As shown, the electromagnetic relay A1 has multiple (in Figure 1In the example of (two), the fixed terminal 60, the movable contact 50, the inner housing 20, the yoke 70, the outer housing 10 and the first filling material 81. The movable contact 50 is arranged below the fixed terminal 60 and contacts the fixed terminal 60. The inner housing 20 accommodates the movable contact 50 and is open at the bottom. The yoke 70 is arranged below the inner housing 20 in a manner covering the opening portion of the inner housing 20. The outer housing 10 accommodates the inner housing 20. The first filling material 81 is filled between the inner housing 20 and the outer housing 10. The first filling material 81 is filled to a position above the lower surface 73 of the yoke 70.

[0024] According to the electromagnetic relay A1, since the first filling material 81 is filled to a position above the lower surface 73 of the yoke 70, the heat from the yoke 70 is not easily transferred to the first filling material 81, and the temperature rise of the first filling material 81 filled in the outer housing 10 can be suppressed. Therefore, in the electromagnetic relay A1, the heat of the inner housing 20 can be efficiently transferred to the first filling material 81.

[0025] (2) Details

[0026] Next, refer to Figure 1 to Figure 5 The electromagnetic relay A1 of the first embodiment will be described in detail. Figure 2 A perspective view showing an electromagnetic relay. Figure 3 express Figure 2 In addition, Figure 4 express Figure 2 YY section view.

[0027] like Figure 3 As shown, the electromagnetic relay A1 includes an outer housing 10, an inner housing 20, a coil 30, a movable iron core 40, a yoke 70, a shaft 41, a movable contact 50, a plurality of fixed terminals 60, and a first filling material 81. The fixed terminal 60 includes a first fixed terminal 61 and a second fixed terminal 62. In addition, the electromagnetic relay A1 includes a pair of permanent magnets 4a, 4b, a connecting portion 5, a spring receiving portion 6, a retainer 7, a crimping spring 8, and a return spring 9. At least the inner housing 20, the movable contact 50, and the fixed terminal 60 constitute the contact device 2. At least the coil 30, the movable iron core 40, and the yoke 70 constitute the electromagnet device 3.

[0028] The outer shell 10 is in the shape of a hollow box (e.g., a rectangular box). The outer shell 10 includes an upper shell 11 and a lower shell 12. The upper shell 11 is in the shape of a rectangular box with an open lower surface. The upper shell 11 is arranged in a manner to cover the inner shell 20. The top 13 of the upper shell 11 has a first through hole 14a and a second through hole 14b. The first through hole 14a is passed through by the first fixed terminal 61. The second through hole 14b is passed through by the second fixed terminal 62. The lower shell 12 is in the shape of a rectangular box with an open upper surface. The lower shell 12 is arranged below the upper shell 11. The lower end 11a of the upper shell 11 is embedded in the upper end 12a of the lower shell 12. Arranged inside the outer shell 10 are an inner shell 20, a coil 30, a movable iron core 40, a yoke 70, a shaft 41, a movable contact 50, a fixed terminal 60, permanent magnets 4a, 4b, a connecting portion 5, a spring receiving portion 6, a retaining member 7, a crimping spring 8 and a return spring 9.

[0029] like Figure 2 As shown, the upper housing 11 has a wall portion 19. The wall portion 19 is plate-shaped (e.g., rectangular plate-shaped). The wall portion 19 is disposed between the pair of fixed terminals 61 and 62 on the upper surface of the upper housing 11. In other words, the wall portion 19 is disposed between the first through hole 14a and the second through hole 14b on the upper surface of the upper housing 11 (see Figure 3 The wall portion 19 ensures an insulation distance (creepage distance) between the first fixed terminal 61 and the second fixed terminal 62 .

[0030] like Figure 3 As shown, lower case 12 has mounting portion 18. Mounting portion 18 is configured to enable electromagnetic relay A1 to be mounted at an installation location. Mounting portion 18 is provided with a hole 18a. A screw (not shown) is passed through hole 18a.

[0031] The coil 30 and the movable iron core 40 are housed in the lower case 12 (the lower part of the outer case 10). The coil 30 brings the movable contact 50 into contact with the first fixed terminal 61 and the second fixed terminal 62, or separates the movable contact 50 from the first fixed terminal 61 and the second fixed terminal 62. The coil 30 has a coil bobbin 31 and an electric wire 32.

[0032] The coil frame 31 has an upper flange portion 31a, a lower flange portion 31b and a barrel portion 31c. The material of the coil frame 31 is a material having electrical insulation (such as resin, etc.). The upper flange portion 31a is plate-shaped (such as a circular plate). A third through hole 14e is provided in the center of the upper flange portion 31a. The lower flange portion 31b is plate-shaped (such as a circular plate). A fourth through hole 14f is provided in the center of the lower flange portion 31b. The barrel portion 31c is hollow cylindrical (such as a hollow cylindrical). The outer diameter of the upper flange portion 31a is smaller than the outer diameter of the lower flange portion 31b. The outer diameter of the barrel portion 31c is smaller than the outer diameter of the upper flange portion 31a and the outer diameter of the lower flange portion 31b. The outer diameter of the upper portion of the barrel portion 31c is smaller than the outer diameter of the central portion of the barrel portion 31c and the outer diameter of the lower portion. The inner diameter of the third through hole 14e of the upper flange portion 31a is the same as the inner diameter of the upper portion of the cylinder portion 31c. The inner diameter of the fourth through hole 14f of the lower flange portion 31b is the same as the inner diameter of the lower portion of the cylinder portion 31c.

[0033] The electric wire 32 is wound around the outer periphery of the cylindrical portion 31c of the coil frame 31. The first end of the electric wire 32 is connected to the first coil terminal 15 (see Figure 5 ) is electrically connected. The second end of the wire 32 is electrically connected to the second coil terminal (not shown). The material of the first coil terminal 15 and the second coil terminal is conductive (such as copper). Figure 5 As shown, the first coil terminal 15 and the second coil terminal are arranged inside the connection portion 17 in the lower case 12 of the outer case 10 .

[0034] like Figure 3 As shown in FIG. 1 , the movable iron core 40 is disposed inside the cylindrical portion 31 c of the coil bobbin 31 . The coil 30 and the movable iron core 40 are disposed inside the yoke 70 .

[0035] The yoke 70 includes a lower yoke 71 and an upper yoke 72 . The material of the yoke 70 is a magnetic material (such as light iron, etc.). The yoke 70 includes at least an upper yoke 72 .

[0036] The lower yoke 71 is a box-shaped (e.g., rectangular box-shaped) with an open upper surface. The coil 30 and the movable iron core 40 are arranged inside the lower yoke 71. The upper yoke 72 is plate-shaped (e.g., rectangular plate-shaped). The upper yoke 72 has the fifth through hole 14g. The fifth through hole 14g is passed through by the shaft 41. The central axis of the fifth through hole 14g is consistent with the central axis of the barrel 31c of the coil frame 31. The upper yoke 72 covers the opening portion of the lower yoke 71 and is installed on the lower yoke 71. The yoke 70 is arranged in the outer shell 10 in such a manner that the lower surface of the lower yoke 71 is opposite to the inner bottom surface of the lower shell 12 in the outer shell 10 and the upper surface 75 of the upper yoke 72 is opposite to the top surface (the lower surface of the top 13) of the upper shell 11 in the outer shell 10. In the present embodiment, the yoke 70 functions together with the movable iron core 40 as a magnetic circuit. The coil 30, the movable iron core 40 and the yoke 70 function as the electromagnet device 3 or a part of the electromagnet device 3. The coil 30 has the function of generating a magnetic field when energized. The coil 30 causes the movable iron core 40 to move upward or downward along the axial direction (first direction D1) of the cylinder 31c of the coil frame 31 according to the presence or absence of the magnetic field and the direction of generation.

[0037] The movable iron core 40 moves upward when the coil 30 is energized. In addition, the movable iron core 40 moves downward when the coil 30 is not energized. The movable iron core 40 is hollow cylindrical (for example, a hollow cylindrical shape). The material of the movable iron core 40 is a magnetic material (for example, light iron, etc.). The movable iron core 40 is arranged inside the coil 30. In more detail, the movable iron core 40 is arranged inside the barrel 31c of the coil frame 31. The movable iron core 40 has a sixth through hole 14h. The sixth through hole 14h is for the shaft 41 to pass through. The central axis of the sixth through hole 14h is consistent with the central axis of the barrel 31c of the coil frame 31.

[0038] The inner case 20 includes a first case 21 and a second case 22. The inner case 20 is made of a heat-resistant material (eg, ceramic). The inner case 20 includes at least the first case 21.

[0039] The first housing 21 is in the shape of a rectangular box with an open lower surface (open at the bottom). The second housing 22 is in the shape of a plate (e.g., a rectangular plate). The top 23 of the first housing 21 has a seventh through hole 14c and an eighth through hole 14d. The seventh through hole 14c is for the first fixed terminal 61 to pass through. The eighth through hole 14d is for the second fixed terminal 62 to pass through. The second housing 22 has a first protrusion 22a and a second protrusion 22b. The first protrusion 22a is provided on the upper surface of the second housing 22 at a portion on the left side of the inner housing 20 in the left-right direction (second direction D2). The second protrusion 22b is provided on the upper surface of the second housing 22 at a portion on the right side of the inner housing 20 in the left-right direction. The second housing 22 is configured to cover the opening portion of the first housing 21. In addition, the second housing 22 is configured on the upper surface 75 of the upper yoke 72 of the yoke 70. The inner housing 20 is accommodated in the upper housing 11 of the outer housing 10.

[0040] A gap space 90 is formed between the outer surface (upper surface and outer peripheral surface) of the first shell 21 of the inner shell 20 and the inner surface (top surface and inner peripheral surface) of the upper shell 11 of the outer shell 10. That is, the outer surface of the first shell 21 of the inner shell 20 and the inner surface of the upper shell 11 of the outer shell 10 are opposite to each other with the gap space 90 interposed therebetween. In other words, the gap space 90 is formed along the outer peripheral surface of the inner shell 20 and the upper surface of the inner shell 20.

[0041] In addition, if Figure 3 As shown, the lower end 21a of the first housing 21 of the inner housing 20 is connected to the upper surface 75 of the upper yoke 72 of the yoke 70 via the connecting portion 5. The connecting portion 5 is mechanically connected to the lower end 21a of the first housing 21 by, for example, brazing. In addition, the connecting portion 5 is mechanically connected to the upper surface 75 of the upper yoke 72 by, for example, brazing.

[0042] A closed space 93 is formed inside the upper shell 11 of the outer shell 10. The closed space 93 is surrounded by the inner surface (top surface and inner peripheral surface) of the first shell 21 of the inner shell 20 and the upper surface 75 of the upper yoke 72 of the yoke 70. That is, the upper yoke 72 of the yoke 70 is arranged below the second shell 22 of the inner shell 20 and is arranged in a manner covering the opening portion of the first shell 21 of the inner shell 20.

[0043] The movable iron core 40 is provided with a shaft 41. The shaft 41 is in the shape of a rod. The shaft 41 passes through the sixth through hole 14h of the movable iron core 40 and is fixed to the movable iron core 40. In addition, the shaft 41 moves in the vertical direction in the fifth through hole 14g of the upper yoke 72. The upper end of the shaft 41 is located in a closed space 93 above the upper surface 75 of the upper yoke 72. The spring receiving portion 6 is provided with the upper end of the shaft 41. The crimping spring 8 is fixed to the spring receiving portion 6. The crimping spring 8 is a coil spring. The crimping spring 8 is a spring for ensuring the crimping between the movable contact 50 and a pair of fixed terminals 61, 62 (the first fixed terminal 61 and the second fixed terminal 62). The crimping spring 8 is fixed to the spring receiving portion 6 in such a manner that the expansion and contraction direction of the crimping spring 8 is consistent with the vertical direction (the first direction D1) of the shaft 41. That is, the lower end of the crimping spring 8 is fixed to the spring receiving portion 6. The movable contact 50 is mounted on the upper end of the pressure contact spring 8 via the retainer 7. That is, the pressure contact spring 8 is arranged between the retainer 7 and the spring receiving portion 6. The retainer 7 retains the movable contact 50. The movable contact 50 is located in the closed space 93. That is, the inner housing 20 accommodates the movable contact 50. In addition, a pair of guides 1a and 1b are fixed to the spring receiving portion 6 (see Figure 4 The pair of guides 1 a and 1 b are fixed to the spring receiving portion 6 so as to sandwich the retainer 7 from both sides of the movable contact 50 in the front-rear direction (third direction D3).

[0044] A return spring 9 is arranged between the upper yoke 72 and the movable iron core 40. The return spring 9 is a coil spring. When the coil 30 is not energized, the return spring 9 pushes the movable iron core 40 downward to return the position of the movable iron core 40 to its original position. The spring coefficient of the return spring 9 is larger than the spring coefficient of the crimping spring 8. The return spring 9 is arranged around the shaft 41. In other words, the shaft 41 passes through the return spring 9.

[0045] like Figure 3 As shown, the movable contact 50 is plate-shaped (e.g., rectangular plate-shaped). The material of the movable contact 50 is a conductive material (e.g., copper). The movable contact 50 has a first movable contact 51 and a second movable contact 52. The first movable contact 51 is provided on the upper surface of the movable contact 50 at a portion on the left side of the movable contact 50 in the left-right direction (second direction D2). The second movable contact 52 is provided on the upper surface of the movable contact 50 at a portion on the right side of the movable contact 50 in the left-right direction.

[0046] The first fixed terminal 61 is in the shape of a bottomed tube (e.g., a bottomed cylindrical shape). The material of the first fixed terminal 61 is a conductive material (e.g., copper, etc.). The first fixed terminal 61 is mounted on the upper housing 11 in such a manner that it passes through the first through hole 14a of the top 13 in the upper housing 11 of the outer housing 10 and faces the first movable contact 51 of the movable contact 50. In addition, the first fixed terminal 61 is mounted on the first housing 21 in such a manner that it passes through the seventh through hole 14c of the top 23 in the first housing 21 of the inner housing 20 and faces the first movable contact 51 of the movable contact 50. The first fixed terminal 61 has a first fixed contact 63. The first fixed contact 63 is provided in the first fixed terminal 61 at a portion facing the first movable contact 51 of the movable contact 50.

[0047] The second fixed terminal 62 is in the shape of a bottomed cylinder (e.g., a bottomed cylindrical shape). The material of the second fixed terminal 62 is a conductive material (e.g., copper, etc.). The second fixed terminal 62 is mounted on the upper housing 11 in such a manner that it penetrates the second through hole 14b of the top 13 in the upper housing 11 of the outer housing 10 and faces the second movable contact 52 of the movable contact 50. In addition, the second fixed terminal 62 is mounted on the first housing 21 in such a manner that it penetrates the eighth through hole 14d of the top 23 in the first housing 21 of the inner housing 20 and faces the second movable contact 52 of the movable contact 50. The second fixed terminal 62 has a second fixed contact 64. The second fixed contact 64 is provided in the second fixed terminal 62 at a portion facing the second movable contact 52 of the movable contact 50.

[0048] That is, the pair of fixed terminals 61, 62 are mounted on the top 13 of the upper shell 11 of the outer shell 10 in a row in the left-right direction (second direction D2) of the upper shell 11. In addition, the pair of fixed terminals 61, 62 are mounted on the top 23 of the first shell 21 of the inner shell 20 in a row in the left-right direction (second direction D2) of the first shell 21.

[0049] The upper end of the first fixed terminal 61 is located above the upper surface of the upper shell 11 of the outer shell 10. The upper end of the second fixed terminal 62 is located above the upper surface of the upper shell 11 of the outer shell 10. The lower end (bottom) of the first fixed terminal 61 is located in the sealed space 93 of the inner shell 20 and faces the first movable contact 51 of the movable contact 50. The lower end (bottom) of the second fixed terminal 62 is located in the sealed space 93 of the inner shell 20 and faces the second movable contact 52 of the movable contact 50. The movable contact 50 is arranged below the first fixed terminal 61 and below the second fixed terminal 62, and contacts the first fixed terminal 61 and the second fixed terminal 62 when moving upward.

[0050] A pair of permanent magnets 4a, 4b are fixed to the outer peripheral surface of the first shell 21 of the inner shell 20. In more detail, the first permanent magnet 4a of the pair of permanent magnets 4a, 4b is fixed to the outer side surface on the left side of the left-right direction (second direction D2) of the first shell 21. The second permanent magnet 4b of the pair of permanent magnets 4a, 4b is fixed to the outer side surface on the right side of the left-right direction of the first shell 21. In short, the pair of permanent magnets 4a, 4b are arranged between the outer peripheral surface of the first shell 21 of the inner shell 20 and the inner peripheral surface of the upper shell 11 of the outer shell 10. The first permanent magnet 4a is plate-shaped (e.g., rectangular plate-shaped). The second permanent magnet 4b is plate-shaped (e.g., rectangular plate-shaped).

[0051] The pair of permanent magnets 4a and 4b are arranged outside the pair of fixed terminals 61 and 62 in the direction in which the pair of fixed terminals 61 and 62 are arranged (the left-right direction of the first housing 21). In addition, the pair of permanent magnets 4a and 4b are arranged outside the movable contact 50 in the direction in which the pair of fixed terminals 61 and 62 are arranged. In short, the pair of permanent magnets 4a and 4b are arranged in a manner that sandwiches the pair of fixed terminals 61 and 62 and the movable contact 50 in the left-right direction of the first housing 21.

[0052] In addition, a pair of permanent magnets 4a and 4b are configured to face different polarities. For example, the right side surface of the first permanent magnet 4a in the left-right direction of the outer shell 10 is an S pole, and the left side surface in the left-right direction of the outer shell 10 is an N pole. The right side surface of the second permanent magnet 4b in the left-right direction of the outer shell 10 is an S pole, and the left side surface in the left-right direction of the outer shell 10 is an N pole. That is, the first permanent magnet 4a has its S pole facing the second permanent magnet 4b. The second permanent magnet 4b has its N pole facing the first permanent magnet 4a. Therefore, the pair of permanent magnets 4a and 4b generate a magnetic field between the pair of fixed contacts 63 and 64 and the pair of movable contacts 51 and 52. Thus, in the electromagnetic relay A1, when the movable contact 50 is separated from the pair of fixed terminals 61, 62, the arc discharge generated between the pair of fixed contacts 63, 64 and the pair of movable contacts 51, 52 can be removed by using the Lorentz force generated by the magnetic field generated by the pair of permanent magnets 4a, 4b. In addition, the number of the pair of permanent magnets 4a, 4b is not limited to two, and may be four or more. That is, the number of the pair of permanent magnets 4a, 4b can be an even number.

[0053] The gap space 90 formed between the outer surface of the first case 21 of the inner case 20 and the inner surface of the upper case 11 of the outer case 10 is filled with the first filling material 81. That is, the first filling material 81 is filled between the inner case 20 and the outer case 10.

[0054] The material of the first filling material 81 is a resin material. The resin material is, for example, a polyurethane resin, an epoxy resin, or a silicone resin. The first filling material 81 is thermally connected to the upper shell 11 of the outer shell 10. In addition, the first filling material 81 is thermally connected to the first shell 21 of the inner shell 20. Preferably, the thermal conductivity (thermal conductivity) of the first filling material 81 is lower than the thermal conductivity (thermal conductivity) of the inner shell 20, and the thermal conductivity (thermal conductivity) of the first filling material 81 is higher than the thermal conductivity (thermal conductivity) of the outer shell 10. As a result, in the electromagnetic relay A1, compared with the case where an air layer is formed between the inner shell 20 and the outer shell 10, heat can be efficiently released to the outside of the inner shell 20.

[0055] In the electromagnetic relay A1, when the movable iron core 40 moves in the up-down direction, the shaft 41 and the movable contact 50 also move in the up-down direction like the movable iron core 40. That is, the movable iron core 40 moves upward and the movable contact 50 moves upward. In addition, the movable iron core 40 moves downward and the movable contact 50 moves downward. In addition, in the electromagnetic relay A1, when the movable contact 50 moves in the upward direction, the upper surface of the movable contact 50 contacts the pair of fixed terminals 61 and 62, and the pair of fixed terminals 61 and 62 are electrically connected (become the connected state). In addition, in the electromagnetic relay A1, when the movable contact 50 moves in the downward direction, the upper surface of the movable contact 50 moves away from the pair of fixed terminals 61 and 62, and the pair of fixed terminals 61 and 62 are electrically disconnected (become the disconnected state).

[0056] In the above-mentioned electromagnetic relay A1, heat is generated by the energization of the coil 30 and the energization and arc discharge between the pair of fixed terminals 61, 62 and the movable contact 50. The temperature of each part in the outer housing 10 rises due to such heat. In the electromagnetic relay A1, the first filling material 81 is filled in the gap space 90 between the inner housing 20 and the outer housing 10, and contacts the outer surface of the inner housing 20. On the other hand, the inner surface of the inner housing 20 faces the closed space 93. That is, the outer surface of the inner housing 20 contacts the first filling material 81, and the inner surface of the inner housing 20 faces the closed space 93. In this case, the temperature of the first filling material 81 is likely to become higher than the temperature of the closed space 93 due to the above-mentioned heat. If the temperature of the first filling material 81 becomes too high compared with the temperature of the inner housing 20 and the temperature difference between the inner surface and the outer surface of the inner housing 20 becomes too large, there is a possibility that cracks, ruptures, etc. will occur in the inner housing 20 due to the difference in thermal expansion between the outer surface and the inner surface of the inner housing 20. In particular, the lower end portion 21 a of the first shell 21 of the inner shell 20 and the second shell 22 of the inner shell 20 are close to the upper yoke 72 of the yoke 70 , and heat may be transferred to the inner shell 20 via the yoke 70 .

[0057] Therefore, in the electromagnetic relay A1 of the present embodiment, as Figure 1 As shown, the first filling material 81 is filled to a position above the lower surface 73 of the yoke 70 (the upper yoke 72 in this embodiment). In other words, the lower surface 81a of the first filling material 81 in the gap space 90 is located above the lower surface 73 of the upper yoke 72 of the yoke 70. In short, the position of the lower surface 81a of the first filling material 81 is located above the lower surface 73 of the upper yoke 72 of the yoke 70.

[0058] The first filling material 81 is filled above the upper surface 75 of the upper yoke 72 of the yoke 70 . In other words, the lower surface 81 a of the first filling material 81 in the gap space 90 is located above the upper surface 75 of the upper yoke 72 of the yoke 70 .

[0059] A first gap 91 is formed between the side surface 74 of the upper yoke 72 of the yoke 70 and the inner surface of the outer shell 10 (see Figure 1 That is, the first gap 91 is not filled with the first filling material 81, and the first filling material 81 is not filled in the side surface 74 and the lower surface 73 of the upper yoke 72 of the yoke 70. In other words, the first filling material 81 does not contact the side surface 74 and the lower surface 73 of the upper yoke 72 of the yoke 70.

[0060] A second gap 92 is formed between the first filler 81 and the upper surface 75 of the upper yoke 72 of the yoke 70 (see Figure 1 Specifically, a second gap 92 not filled with the first filling material 81 is formed above the upper surface 75 of the upper yoke 72 in the gap space 90 . That is, the first filling material 81 is filled above the second gap 92 in the gap space 90 .

[0061] In the electromagnetic relay A1 of the present embodiment, the first filling material 81 is filled at a position above the lower surface 73 of the upper yoke 72 of the yoke 70, and the lower surface 81a of the first filling material 81 is located at a position above the lower surface 73 of the upper yoke 72. That is, the first filling material 81 is not filled at a position below the lower surface 73 of the upper yoke 72. Therefore, in the electromagnetic relay A1, the heat from the yoke 70 is not easily transferred to the first filling material 81, and the temperature rise of the first filling material 81 can be suppressed. As a result, in the electromagnetic relay A1, the heat of the inner housing 20 can be efficiently transferred to the first filling material 81. In such an electromagnetic relay A1, the temperature difference between the inner surface and the outer surface of the inner housing 20 can be suppressed, so that it is not easy to generate cracks, ruptures, etc. in the inner housing 20.

[0062] In particular, the lower surface 81a of the first filling material 81 is located above the lower surface 73 of the upper yoke 72 of the yoke 70. Therefore, the heat from the yoke 70 is less likely to be transferred to the first filling material 81, and the temperature rise of the first filling material 81 can be suppressed. As a result, in the electromagnetic relay A1, the temperature difference between the inner surface and the outer surface of the inner housing 20 is suppressed, so that cracks, ruptures, etc. are less likely to occur in the inner housing 20.

[0063] (Implementation Method 2)

[0064] like Figure 6 and Figure 7 As shown, the electromagnetic relay A2 of the second embodiment is different from the electromagnetic relay A1 of the first embodiment in that the position of the lower surface 81a of the first filling material 81 is different. Figure 1 to Figure 5 ) The same structures are marked with the same figure marks and the description is omitted.

[0065] like Figure 6 and Figure 7 As shown, the first filling material 81 contacts the upper surface 75 of the upper yoke 72 of the yoke 70. In other words, the lower surface 81a of the first filling material 81 in the gap space 90 contacts the upper surface 75 of the upper yoke 72 of the yoke 70. In short, the position of the lower surface 81a of the first filling material 81 coincides with the position of the upper surface 75 of the upper yoke 72 of the yoke 70, and the first filling material 81 is filled until the upper surface 75 of the upper yoke 72 of the yoke 70.

[0066] In addition, if Figure 6 As shown, the first gap 91 between the side surface 74 of the upper yoke 72 of the yoke 70 and the inner surface of the outer shell 10 is not filled with the first filling material 81, and the first filling material 81 is not filled in the side surface 74 and the lower surface 73 of the upper yoke 72 of the yoke 70. In other words, the first filling material 81 does not contact the side surface 74 and the lower surface 73 of the upper yoke 72 of the yoke 70.

[0067] In addition, the first filling material 81 is filled in the gap space 90 formed from the upper surface 75 of the upper yoke 72 of the yoke 70 to the upper side. More specifically, the first filling material 81 is filled in the gap space 90 formed between the outer surface (upper surface and outer peripheral surface) of the first shell 21 of the inner shell 20, the inner surface (top surface and inner peripheral surface) of the upper shell 11 of the outer shell 10, and the upper surface 75 of the upper yoke 72 of the yoke 70. That is, as Figure 6 As shown, in the electromagnetic relay A2, the second gap 92 (see Figure 1 ) is filled with a first filling material 81.

[0068] Therefore, in the electromagnetic relay A2 of the second embodiment, the filling amount of the first filling material 81 is increased compared to the electromagnetic relay A1 of the first embodiment. Therefore, the first filling material 81 is less likely to be thermally saturated, and the heat of the inner case 20 can be more efficiently transferred to the first filling material 81 .

[0069] (Implementation method 3)

[0070] like Figure 8 As shown, the electromagnetic relay A3 of the third embodiment is different from the electromagnetic relay A2 of the second embodiment in that it further includes a second filling material 82. In addition, regarding the electromagnetic relay A3 of the third embodiment, the electromagnetic relay A2 of the second embodiment (see Figure 6 and Figure 7 ) The same structures are marked with the same figure marks and the description is omitted.

[0071] like Figure 8 As shown, the electromagnetic relay A3 further includes a second filling material 82. The second filling material 82 is a resin material. The resin material is, for example, polyurethane resin, epoxy resin, or silicone resin. In addition, the composition of the first filling material 81 and the second filling material 82 may be the same or different.

[0072] The second filling material 82 is filled in the lower case 12 of the outer case 10. Specifically, the second filling material 82 is filled around the coil 30 inside the lower case 12, and the upper surface 82a of the second filling material 82 in the up-down direction (first direction D1) of the outer case 10 is in contact with the lower surface 73 of the upper yoke 72 of the yoke 70. The second filling material 82 is thermally connected to the lower case 12 of the outer case 10. In addition, the second filling material 82 is thermally connected to the coil 30.

[0073] The lower surface 81a of the first filling material 81 is in contact with the upper surface 75 of the upper yoke 72 of the yoke 70. That is, the lower surface 81a of the first filling material 81 is separated from the upper surface 82a of the second filling material 82 by an amount corresponding to the thickness of the upper yoke 72 of the yoke 70. In short, the lower surface 81a of the first filling material 81 is not in contact with the upper surface 82a of the second filling material 82. Preferably, the thermal conductivity (thermal conductivity) of the second filling material 82 is lower than the thermal conductivity (thermal conductivity) of the inner housing 20, and the thermal conductivity (thermal conductivity) of the second filling material 82 is higher than the thermal conductivity (thermal conductivity) of the outer housing 10. Thus, in the electromagnetic relay A3, compared with the case where the second filling material 82 is not provided (for example, the case where an air layer is formed between the lower housing 12 of the outer housing 10 and the coil 30), heat (for example, heat generated by the coil 30, etc.) can be efficiently released to the outside of the outer housing 10.

[0074] Therefore, the electromagnetic relay A3 is a structure in which the second filling material 82 is filled in the lower shell 12 of the outer shell 10, and the lower surface 81a of the first filling material 81 and the upper surface 82a of the second filling material 82 are not in contact. Therefore, in the electromagnetic relay A3, it is not easy for heat to transfer between the first filling material 81 and the second filling material 82, and problems of the electromagnetic relay A3 can be prevented. In particular, in the electromagnetic relay A3, it is not easy for heat to transfer from the first filling material 81, which is easy to become high temperature, to the second filling material 82, and the thermal influence on the coil 30 and the like can be suppressed.

[0075] Furthermore, the lower surface 81a of the first filling material 81 may not contact the upper surface 75 of the upper yoke 72 of the yoke 70. That is, similarly to the electromagnetic relay A1 of the first embodiment, the lower surface 81a of the first filling material 81 may be located above the upper surface 75 of the upper yoke 72 of the yoke 70.

[0076] (Implementation 4)

[0077] like Fig. 9 As shown, the electromagnetic relay A4 of the fourth embodiment is different from the electromagnetic relay A3 of the third embodiment in that the second filling material 82 is arranged differently. Figure 8 ) The same structures are marked with the same figure marks and the description is omitted.

[0078] like Fig. 9 As shown, the second filling material 82 is filled in the lower shell 12 of the outer shell 10. In addition, the second filling material 82 is filled around the lower yoke 71 of the yoke 70 inside the lower shell 12 of the outer shell 10. That is, the upper surface 82a of the second filling material 82 does not contact the lower surface 73 of the upper yoke 72 of the yoke 70. The second filling material 82 is thermally connected to the lower shell 12 of the outer shell 10. In addition, the second filling material 82 is thermally connected to the lower yoke 71 of the yoke 70.

[0079] The lower surface 81a of the first filling material 81 and the upper surface 82a of the second filling material 82 are separated by an amount corresponding to the thickness of the upper yoke 72 of the yoke 70. In short, the lower surface 81a of the first filling material 81 and the upper surface 82a of the second filling material 82 are not in contact.

[0080] Therefore, the electromagnetic relay A4 is a structure in which the second filling material 82 is filled in the lower shell 12 of the outer shell 10, and the lower surface 81a of the first filling material 81 and the upper surface 82a of the second filling material 82 are not in contact. Therefore, in the electromagnetic relay A4, it is not easy for heat to transfer between the first filling material 81 and the second filling material 82, and problems of the electromagnetic relay A4 can be prevented. In particular, in the electromagnetic relay A4, it is not easy for heat to transfer from the first filling material 81, which is easy to become high temperature, to the second filling material 82, and the thermal influence on the coil 30 and the like can be suppressed.

[0081] (plan)

[0082] The following aspects are disclosed in this specification.

[0083] The electromagnetic relay (A1, A2, A3, A4) of the first embodiment comprises a fixed terminal (60), a movable contact (50), an inner housing (20), a yoke (72), an outer housing (10) and a first filling material (81). The movable contact (50) is arranged below the fixed terminal (60) and contacts the fixed terminal (60). The inner housing (20) accommodates the movable contact (50) and is open at the bottom. The yoke (72) is arranged below the inner housing (20) in a manner covering the opening portion of the inner housing (20). The outer housing (10) accommodates the inner housing (20). The first filling material (81) is filled between the inner housing (20) and the outer housing (10). The first filling material (81) is filled to a position above the lower surface (73) of the yoke (72).

[0084] In the electromagnetic relay (A1, A2, A3, A4), since the first filling material (81) is filled to a position above the lower surface (73) of the yoke (72), heat from the yoke (72) is not easily transferred to the first filling material (81), and the temperature rise of the first filling material (81) filled in the outer shell (10) can be suppressed. As a result, in the electromagnetic relay (A1, A2, A3, A4), the heat of the inner shell (20) can be efficiently transferred to the first filling material (81).

[0085] In the electromagnetic relay (A1, A2, A3, A4) of the second embodiment, preferably, based on the first embodiment, a lower surface (81a) of the first filler (81) is located above a lower surface (73) of the yoke (72).

[0086] In the electromagnetic relay (A1, A2, A3, A4), the temperature rise of the first filling material (81) filled in the outer shell (10) can be suppressed. As a result, in the electromagnetic relay (A1, A2, A3, A4), the heat of the inner shell (20) can be efficiently transferred to the first filling material (81).

[0087] For the electromagnetic relay (A1, A2, A3, A4) of the third embodiment, it is preferred that, based on the first or second embodiment, a first gap (91) is formed between the side surface (74) of the yoke (72) and the inner surface of the outer shell (10).

[0088] In the above-mentioned electromagnetic relay (A1, A2, A3, A4), the first filling material (81) does not contact the side (74) of the yoke (72), so that the heat from the yoke (72) is less likely to be transferred to the first filling material (81), and the heat of the inner shell (20) can be transferred to the first filling material (81) more efficiently.

[0089] For the electromagnetic relay (A1, A2, A3, A4) of the fourth embodiment, it is preferred that, based on any one of the first to third embodiments, the first filling material (81) is filled to a position above the upper surface (75) of the yoke (72).

[0090] In the above-mentioned electromagnetic relay (A1, A2, A3, A4), heat from the yoke (72) is less likely to be transferred to the first filling material (81), and heat from the inner housing (20) can be transferred to the first filling material (81) more efficiently.

[0091] In the electromagnetic relay (A2, A3, A4) of the fifth embodiment, preferably, in any one of the first to fourth embodiments, the first filler (81) is in contact with the upper surface (75) of the yoke (72).

[0092] In the electromagnetic relay (A2, A3, A4), since the filling amount of the first filling material (81) is increased, the first filling material (81) is less likely to be thermally saturated, and the heat of the inner housing (20) can be more efficiently transferred to the first filling material (81).

[0093] In the electromagnetic relay (A1) of the sixth embodiment, preferably, based on any one of the first to fourth embodiments, a second gap (92) is formed between the first filler (81) and the upper surface (75) of the yoke (72).

[0094] In the above-mentioned electromagnetic relay (A1), since the first filling material (81) is not in contact with the upper surface (75) of the yoke (72), it is more difficult for heat from the yoke (72) to be transferred to the first filling material (81), and the heat of the inner shell (20) can be transferred to the first filling material (81) more efficiently.

[0095] For the electromagnetic relay (A3, A4) of the seventh embodiment, it is preferred that, on the basis of any one of the first to sixth embodiments, it further comprises a movable iron core (40), a coil (30) and a second filling material (82). The movable iron core (40) moves upward to move the movable contact (50) upward, and moves downward to move the movable contact (50) downward. The coil (30) moves the movable iron core (40) upward or downward. The outer shell (10) has: an upper shell (11) that accommodates the inner shell (20); and a lower shell (12) that accommodates the movable iron core (40) and the coil (30) and is filled with the second filling material (82). The lower surface (81a) of the first filling material (81) is not in contact with the upper surface (82a) of the second filling material (82).

[0096] The electromagnetic relay (A3, A4) is a structure in which a second filling material (82) is filled in a lower housing (12), and the lower surface (81a) of the first filling material (81) and the upper surface (82a) of the second filling material (82) are not in contact, so that heat transfer is not likely to occur between the first filling material (81) and the second filling material (82), which can prevent problems with the electromagnetic relay (A3, A4). In particular, in the electromagnetic relay (A3, A4), heat transfer from the first filling material (81) that is prone to high temperature to the second filling material (82) is not likely to occur, which can suppress the thermal influence on the coil (30) and the like.

[0097] For the electromagnetic relay (A1, A2, A3, A4) of the 8th embodiment, it is preferred that, based on any one of the 1st to 7th embodiments, the thermal conductivity of the first filling material (81) is lower than the thermal conductivity of the inner housing (20), and the thermal conductivity of the first filling material (81) is higher than the thermal conductivity of the outer housing (10).

[0098] The electromagnetic relay (A1, A2, A3, A4) can efficiently release heat to the outside of the inner housing (20) compared to a case where an air layer is formed between the inner housing (20) and the outer housing (10).

[0099] Description of Reference Numerals

[0100] 10. Outer shell; 11. Upper shell; 12. Lower shell; 20. Inner shell; 30. Coil; 40. Movable iron core; 50. Movable contact; 60. Fixed terminal; 72. Upper yoke (yoke); 73. Lower surface; 74. Side; 75. Upper surface; 81. First filling material; 81a. Lower surface; 82. Second filling material; 82a. Upper surface; 91. First gap; 92. Second gap; A1. Electromagnetic relay; A2. Electromagnetic relay; A3. Electromagnetic relay; A4. Electromagnetic relay.

Claims

1. An electromagnetic relay, wherein: The electromagnetic relay has: Fixed terminal; A movable contact, which is arranged below the fixed terminal and contacts the fixed terminal; An inner housing, which accommodates the movable contact and has an opening at the bottom; a yoke disposed below the inner shell so as to cover the opening portion of the inner shell; An outer shell, which accommodates the inner shell; as well as a first filling material filled between the inner shell and the outer shell, The first filling material is filled to a position above the lower surface of the yoke.

2. The electromagnetic relay according to claim 1, wherein: The lower surface of the first filler is located above the lower surface of the yoke.

3. The electromagnetic relay according to claim 1 or 2, wherein: A first gap is formed between the side surface of the yoke and the inner surface of the outer housing.

4. The electromagnetic relay according to any one of claims 1 to 3, wherein: The first filling material is filled to a position above the upper surface of the yoke.

5. The electromagnetic relay according to any one of claims 1 to 4, wherein: The first filling material is in contact with the upper surface of the yoke.

6. The electromagnetic relay according to any one of claims 1 to 4, wherein: A second gap is formed between the first filling material and the upper surface of the yoke.

7. The electromagnetic relay according to any one of claims 1 to 6, wherein: The electromagnetic relay also has: A movable iron core, which moves upward to move the movable contact upward, and which moves downward to move the movable contact downward; a coil that moves the movable iron core upward or downward; and The second filling material, The outer shell has: an upper housing that receives the inner housing; and a lower housing, which accommodates the movable iron core and the coil and is filled with the second filling material; The lower surface of the first filling material is not in contact with the upper surface of the second filling material.

8. The electromagnetic relay according to any one of claims 1 to 7, wherein: The thermal conductivity of the first filling material is lower than the thermal conductivity of the inner shell, and the thermal conductivity of the first filling material is higher than the thermal conductivity of the outer shell.

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