Electromagnetic relay with reduced footprint

Abstract

The application discloses an electromagnetic relay with reduced occupied space, comprising a base, a magnetic circuit part and a contact part, the contact part comprising at least one normally open contact group and at least one normally closed contact group, the normally open contact group and the normally closed contact group each comprising a dynamic spring part and a static spring part matched with each other, the dynamic spring part comprising a dynamic spring sheet and a dynamic contact; the normally open contact group and the normally closed contact group are arranged along a horizontal first direction on the base, and the free end of each dynamic spring sheet is respectively provided with a dynamic contact; the free end of the dynamic spring sheet of the normally open contact group and the free end of the dynamic spring sheet of the normally closed contact group are towards different sides of a second direction perpendicular to the first direction, and the dynamic spring sheet of the normally open contact group is inclined to extend to the direction of disconnecting the contact, and / or the dynamic spring sheet of the normally closed contact group is inclined to extend to the direction of closing the contact. The contact groups are more compact, and the occupied space of the product in the first direction is reduced.

Description

Technical Field

[0001] This invention relates to a relay, and more particularly to an electromagnetic relay that reduces space requirements. Background Technology

[0002] An electromagnetic relay is an electronic control device that is commonly used in automatic control circuits. It is essentially an "automatic switch" that uses a smaller current to control a larger current, thus playing roles such as automatic adjustment, safety protection, and circuit switching in circuits.

[0003] An existing electromagnetic relay includes a magnetic circuit and multiple contact groups. These contact groups include at least one normally closed contact group and at least one normally open contact group, arranged in a straight line. The free ends of the moving springs of the normally open and normally closed contact groups extend towards the same side in the same direction and are provided with moving contacts. That is, the contacts of the normally open and normally closed contact groups are located on the same side. The armature of the magnetic circuit cooperates with each moving spring through a pusher to drive the normally open contact group to close and the normally closed contact group to open when the coil of the magnetic circuit is energized. Since the length occupied by the contact group is at least the total displacement of all contact groups plus the necessary creepage and air gap length, the above arrangement of multiple contact groups results in a minimum overall length that is the sum of the displacements of each contact group plus the necessary creepage and air gap length. This results in a relatively large overall length, which is not conducive to miniaturization of the product. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an electromagnetic relay that reduces space occupation. It improves the arrangement of the contact group, thereby reducing the overall length occupied by the contact group.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an electromagnetic relay that reduces space occupation, including a base, a magnetic circuit part and a contact part. The contact part includes at least one normally open contact group and at least one normally closed contact group. The normally open contact group and the normally closed contact group are arranged on the base along a horizontal first direction, and the free ends of the moving springs of the normally open contact group and the normally closed contact group are respectively provided with moving contacts. The armature of the magnetic circuit part cooperates with each moving spring by pushing a clip so that when the coil of the magnetic circuit part is energized, the normally open contact group is closed and the normally closed contact group is opened. The free ends of the moving springs of the normally open contact group and the moving springs of the normally closed contact group are oriented to different sides of a second direction perpendicular to the first direction, and the moving springs of the normally open contact group extend obliquely in the direction of contact opening, and / or the moving springs of the normally closed contact group extend obliquely in the direction of contact closing.

[0006] Furthermore, the normally open contact group and the normally closed contact group are the same component; the moving spring lead of the normally closed contact group and the stationary spring lead of the adjacent normally open contact group are located on one side of the second direction and are offset from each other in the first direction; the stationary spring lead of the normally closed contact group and the moving spring lead of the adjacent normally open contact group are located on the other side of the second direction and are offset from each other in the first direction; the second direction is the horizontal direction.

[0007] Furthermore, the push card is provided with at least one first limiting groove, and the moving spring of the normally open contact group is inserted into the corresponding first limiting groove; the push card is also provided with at least one pushing claw for pushing the moving spring of the normally closed contact group to move; the push card is also provided with a plurality of partitions arranged along the first direction, each partition being located between two adjacent normally closed contact groups or between two adjacent normally open contact groups or between adjacent normally closed contact groups and normally open contact groups.

[0008] Furthermore, it also includes a housing with an opening at the bottom, the bottom of which is connected to the base and encloses the magnetic circuit portion, the contact portion, and the push card therein; the inner top surface of the housing is provided with at least one guide post extending downward, the bottom of which is inserted and fixed in a corresponding groove or through hole on the base.

[0009] Furthermore, the portion of the guide post located in the groove or through hole is a thin segment, and the portion above the thin segment is a thick segment; there are multiple guide posts, and the multiple guide posts are arranged in at least one row, with each row located in the first direction.

[0010] Furthermore, the bottom of the guide column is fixed to the base by one or more of the following methods: adhesive fixing, hot riveting fixing, and snap-fit ​​connection.

[0011] Furthermore, the base is provided with a plurality of contact cavities arranged along the first direction, and adjacent contact cavities are separated by a first partition wall. Each contact cavity is equipped with a normally open contact group or a normally closed contact group. The inner top surface of the outer shell is provided with a plurality of first ribs arranged along the first direction. Each first rib extends in a horizontal direction perpendicular to the first direction and enters a different contact cavity and is close to the first partition wall. The bottom end of the first rib is lower than the top end of the first partition wall.

[0012] Furthermore, the base is provided with a second partition wall for separating the magnetic circuit portion from the contact portion. There are two second partition walls, and an elongated groove extending along the first direction is formed between the two second partition walls. The inner top surface of the outer shell is provided with a second rib extending along the first direction, and the second rib is inserted into the elongated groove.

[0013] Furthermore, the magnetic circuit portion includes a coil assembly, a yoke, the armature, and a compression spring. The yoke is fixed to the coil assembly. The compression spring includes a fixing part and a spring portion disposed on the fixing part for providing a restoring reaction force to the armature. The fixing part is engaged with the yoke, and the fixing part and / or the spring portion limit the armature at the blade edge of the yoke, so that the armature can swing around the blade edge of the yoke and limit the armature in the thickness direction and / or width direction at the location of the blade edge of the yoke.

[0014] Furthermore, the fixing part has a hollow inner cavity. The fixing part is fitted onto the yoke from one end where the blade is located along the length of the blade location. When the fixing part is fully fitted, it is snapped into place with the yoke to prevent the fixing part from disengaging from the yoke in the opposite direction of the fitting direction. Limiting steps are provided on the two opposite sides of the yoke to limit the fitting depth of the fixing part.

[0015] Furthermore, the fixing part is semi-enclosed, including a main body and two side bodies. The side bodies are located at opposite ends of the main body and are arranged opposite each other. The ends of the side bodies away from the main body are bent inwards respectively to form two oppositely arranged stop plates. When the fixing part is installed in place, the main body and the stop plates are located on opposite sides of the yoke. One or more of the main body, side bodies and stop plates are snapped together with the yoke. The end of the armature that mates with the blade is located between the two side bodies and is blocked by the stop plates. The spring plate is located on the main body. A limiting block is provided on each of the opposite sides of the end of the armature that mates with the blade. The two stop plates are provided with clearance notches. The limiting blocks enter the fixing part through the clearance notches and avoid the clearance notches and are blocked by the stop plates by moving in the opposite direction of the mounting direction of the fixing part along with the armature.

[0016] Furthermore, the end of the armature that mates with the blade is provided with a push arm extending from the end of the armature away from the blade toward the end of the armature that mates with the blade; the fixing part has a limiting piece extending along the thickness direction of the portion where the blade of the yoke is located toward the side close to the coil assembly, the limiting piece mates with the side of the armature opposite to the yoke; the spring piece is provided at the end of the limiting piece facing the push arm and abuts against the side of the push arm opposite to the yoke; the push arm passes through a clearance hole provided in the fixing part, the clearance hole extending to the limiting piece.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Since the free ends of the moving springs of the normally open contact group and the normally closed contact group face different sides in the second direction, and the moving springs of the normally open contact group extend inclinedly in the direction of contact disconnection, and / or the moving springs of the normally closed contact group extend inclinedly in the direction of contact closure, when the contact groups are arranged as close as possible to each other, the movement displacement of the moving springs of the normally closed contact group can occupy a part of the position of the fulcrum of the moving springs of the normally open contact group (the fulcrum of the moving spring moves very little in the direction of movement), and / or the movement displacement of the moving springs of the normally open contact group can occupy a part of the position of the fulcrum of the moving springs of the normally closed contact group, thereby making the contact groups more compact and reducing the space occupied by the product in the first direction.

[0019] 2. Since the normally open contact group and the normally closed contact group are the same component, the parts of the normally closed contact group and the normally open contact group can be shared, thereby reducing the mold opening cost and the number of molds.

[0020] 3. The moving spring lead of the normally closed contact group and the stationary spring lead of the adjacent normally open contact group are located on the same side of the second direction and are offset from each other in the first direction. The stationary spring lead of the normally closed contact group and the moving spring lead of the adjacent normally open contact group are located on the other side of the second direction and are offset from each other in the first direction. The second direction is horizontal. This not only facilitates customer wiring but also increases the creepage distance and air gap between adjacent normally open and normally closed contact groups.

[0021] 4. The inner top surface of the outer shell is provided with at least one guide post extending downward. The bottom of the guide post is inserted and fixed in a corresponding groove or through hole on the base. This allows the present invention to use the guide post to hold the top wall of the outer shell, making the top wall of the outer shell thinner and / or less prone to warping and deformation in large areas. It also avoids the pressure difference between the inside and outside of the product after plastic sealing, which can cause the top wall of the outer shell to bulge and deform.

[0022] 5. The portion of the guide post located in the groove or through hole is a thin segment, and the portion above the thin segment is a thick segment. This reduces the clearance space of the base on the guide post and strengthens the guide post.

[0023] 6. The first rib, in conjunction with the first partition wall, can isolate contact spatter generated by the contact group segmentation, preventing it from spreading to other contact cavities, thereby improving the cleanliness of each contact cavity and enhancing the reliability of the electrical contact of this invention. In particular, this invention uses a first rib instead of the partition wall of the prior art, significantly reducing the height, preventing deformation of the outer shell, maintaining a smooth outer surface of the shell, and preventing weld marks from appearing at the location corresponding to the first rib.

[0024] 7. The second rib is inserted into the long groove formed by the two second partitions. This not only significantly improves the creepage distance and spatial clearance between the contact part and the magnetic circuit part, but also allows the height of the second rib to be made very low, preventing deformation of the outer shell and keeping the outer surface of the outer shell flat, thus preventing weld marks from appearing at the position corresponding to the second rib. If there is only one second partition, in order to ensure that the creepage distance and spatial clearance between the contact part and the magnetic circuit part are large enough, the height of the second rib needs to be made relatively high, which can easily cause deformation of the outer shell and the appearance of weld marks.

[0025] 8. The compression spring includes a fixing part and a spring part. The fixing part is fitted onto the yoke, and the fixing part and / or the spring part limits the armature at the blade edge of the yoke, so that the armature can swing around the blade edge of the yoke, and limits the armature in the thickness direction and / or width direction of the part where the blade edge of the yoke is located. The compression spring of the present invention not only avoids installation on the base or coil frame of the relay, but also avoids riveting to the yoke and armature, does not generate plastic shavings, can reduce the investment in riveting equipment, and can also limit the armature in multiple directions and provide the armature with restoring reaction force, thereby improving the impact resistance and drop resistance of the armature of the present invention, and improving the stability of the operation of the present invention.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the space-saving electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0027] Figure 1 This is an exploded view of the present invention;

[0028] Figure 2 This is a three-dimensional structural diagram of the contact portion of the present invention;

[0029] Figure 3 This is a three-dimensional structural diagram of the push card of the present invention;

[0030] Figure 4 This is a top view of the invention (excluding the outer casing);

[0031] Figure 5 This is a three-dimensional structural diagram of the outer casing of the present invention;

[0032] Figure 6 This is a top view of the outer casing of the present invention;

[0033] Figure 7 yes Figure 6 AA section view;

[0034] Figure 8 This is a top view of the base of the present invention;

[0035] Figure 9 yes Figure 8BB section view;

[0036] Figure 10 This is a bottom view of the present invention;

[0037] Figure 11 yes Figure 10 CC section view;

[0038] Figure 12 This is a three-dimensional structural schematic diagram of the compression spring of the present invention;

[0039] Figure 13 This is a three-dimensional structural schematic diagram of the armature of the present invention;

[0040] Figure 14 This is a three-dimensional structural schematic diagram of the yoke of the present invention;

[0041] Figure 15 This is a schematic diagram of the assembly of the armature and compression spring of the present invention. Figure 1 ;

[0042] Figure 16 This is a schematic diagram of the assembly of the armature and compression spring of the present invention. Figure 2 ;

[0043] Figure 17 This is a schematic diagram of the assembly of the armature and compression spring of the present invention. Figure 3 ;

[0044] Figure 18 This is a schematic diagram of the assembly of the armature and compression spring with the yoke of the present invention;

[0045] Figure 19 This is a three-dimensional structural schematic diagram of the magnetic circuit portion of the present invention;

[0046] Figure 20 This is a top view of the magnetic circuit portion of the present invention;

[0047] Among them, 1. Base; 11. Through hole; 12. First partition wall; 13. Second partition wall; 14. Long slot; 2. Outer shell; 21. Guide post; 211. Thin section; 212. Thick section; 22. First rib; 23. Second rib; 3. Magnetic circuit part; 31. Yoke; 311. Slot; 312. Limiting step; 313. Knife edge; 32. Armature; 321. Push arm; 322. Limiting block; 323. Protrusion; 33. Compression spring; 331. Spring part; 332. 333. Main plate body; 334. Side plate body; 335. Stop plate; 336. Locking tongue; 337. Limiting plate; 338. Displacement hole; 339. Displacement notch; 4. Normally open contact group; 5. Normally closed contact group; 41 / 51. Moving spring; 42 / 52. Moving contact; 43 / 53. Stationary spring part; 44 / 54. Moving spring lead-out foot; 45 / 55. Stationary spring lead-out foot; 6. Pushing clip; 61. First limiting groove; 62. Pushing claw; 63. Partition plate; 64. Second limiting groove. Detailed Implementation

[0048] In this invention, the terms "first," "second," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0049] Please see Figures 1-20 As shown, an electromagnetic relay of the present invention with reduced space occupation includes a base 1, a magnetic circuit part 3, and a contact part. The contact part includes at least one normally open contact group 4 and at least one normally closed contact group 5. The normally open contact group 4 and the normally closed contact group 5 respectively include a moving spring part and a stationary spring part 43 / 53 that cooperate with each other. The moving spring part includes a moving spring piece 41 / 51 and a moving contact 42 / 52. The normally open contact group 4 and the normally closed contact group 5 are arranged on the base 1 along a horizontal first direction, and the free end of each moving spring piece is provided with a moving contact 42 / 52. The armature 32 of the magnetic circuit part 3 cooperates with each moving spring piece by pushing a clip 6 so that when the coil of the magnetic circuit part 3 is energized, the normally open contact group 4 is closed and the normally closed contact group 5 is opened. The free end of the moving spring 41 of the normally open contact group 4 and the free end of the moving spring 51 of the normally closed contact group 5 face different sides of a second direction perpendicular to the first direction. The moving spring 41 of the normally open contact group 4 is inclined towards its contact disconnection direction, and / or the moving spring 51 of the normally closed contact group 5 is inclined towards its contact closing direction. Specifically, in this embodiment, only the moving spring 41 of the normally open contact group 4 is inclined towards its contact disconnection direction (i.e.,...). Figure 4The second direction is horizontal. Specifically, the first direction is the length direction of the base 1 (i.e., the direction of extension of the normally closed contact group 5 in the rightward direction from the perspective of viewing angle, with an angle of 5°-10°). The moving spring 51 of the normally closed contact group 5 extends in a direction that is basically perpendicular to the first direction when the contacts are closed. Figure 1 The direction of the Y-axis in the three-dimensional coordinate system), the second direction is the width direction of the base 1 (i.e. Figure 1 The direction of the X-axis in the three-dimensional coordinate system is mentioned, but not limited to this. In other embodiments, the second direction is the height direction of the base. There are multiple normally open contact groups 4 and two normally closed contact groups 5, but not limited to this. Multiple normally open contact groups 4 are located between two normally closed contact groups 5.

[0050] In this embodiment, the normally open contact group 4 and the normally closed contact group 5 are the same component. Specifically, the moving spring portion of the normally open contact group 4 and the moving spring portion of the normally closed contact group 5 are the same component, and the stationary spring portion 43 of the normally open contact group 4 and the stationary spring portion 53 of the normally closed contact group 5 are the same component. Therefore, the components of the normally closed contact group 5 and the normally open contact group 4 can be shared, thereby reducing mold opening costs and the number of molds.

[0051] In this embodiment, the root portion of each movable spring is formed by bending twice, as shown below. Figure 2 The structure shown includes a downwardly extending movable spring lead-out foot 44 / 54. (As shown...) Figure 10 As shown, the moving spring lead 54 of the normally closed contact group 5 and the stationary spring lead 45 of the adjacent normally open contact group 4 are located on the same side in the second direction and are offset from each other in the first direction; the stationary spring lead 55 of the normally closed contact group 5 and the moving spring lead 44 of the adjacent normally open contact group 4 are located on the other side in the second direction and are offset from each other in the first direction. This not only facilitates customer wiring but also increases the creepage distance and air gap between adjacent normally open contact groups 4 and normally closed contact groups 5. Figure 10 The line segment S in the diagram is shown.

[0052] In this embodiment, as Figure 3As shown, the push card 6 is provided with at least one first limiting groove 61 for moving the movable spring 41 of the normally open contact group 4, and the movable spring 4 of the normally open contact group 4 is inserted into the corresponding first limiting groove 61; the push card 6 is also provided with at least one push claw 62 for moving the movable spring 5 of the normally closed contact group 5, and the push claw 62 is located on the side of the movable spring 51 of the corresponding normally closed contact group 5 facing the stationary spring portion. The push card 6 is also provided with a plurality of partitions 63 arranged along the first direction, and each partition 63 is located between two adjacent normally closed contact groups 5, or between two adjacent normally open contact groups 4, or between adjacent normally closed contact groups 5 and normally open contact groups 4.

[0053] In this embodiment, the invention further includes a housing 2 with an opening at the bottom, the bottom of which is connected to the base 1, and encloses the magnetic circuit portion 3, the contact portion, and the push card 6 therein. Figures 5-7 As shown, the inner top surface of the outer shell 2 is provided with at least one downwardly extending guide post 21, the bottom of which is inserted and fixed into a corresponding through hole 11 on the base 1. Specifically, there are multiple guide posts 21, arranged in at least one row, each row arranged along a horizontal first direction. Specifically, in this embodiment, multiple guide posts 21 are arranged in one row, but not limited to this. Each guide post 21 is approximately located at the middle position of the outer shell 2 in the width direction. The portion of the guide post 21 located in the through hole 11 is a thin segment 211, and the portion above the thin segment 211 is a thick segment 212. The cross-section of the thin segment 211 is circular, and the cross-section of the thick segment 212 is square. In this way, on the one hand, the clearance space of the base 1 for the guide post 21 can be reduced, and on the other hand, the strength of the guide post 21 can be strengthened.

[0054] In this embodiment, the bottom of the guide post 21 is fixed to the base 1 by one or more of the following methods: adhesive fixing, hot riveting fixing, and snap-fit ​​connection. When the guide post 21 is fixed in a way that does not require fixing at the bottom of the base 1, the through hole 11 can be replaced by a groove (or blind hole, countersunk groove).

[0055] In this embodiment, as Figure 8As shown, the base 1 has multiple contact cavities arranged along the first direction. Adjacent contact cavities are separated by a first partition wall 12 located on the base 1. The first partition wall 12 extends along the first direction, and each contact cavity contains one normally open contact group 4 or one normally closed contact group 5. The inner top surface of the outer shell 2 has multiple first ribs 22 arranged along the first direction. Each first rib 22 extends along a horizontal direction perpendicular to the first direction (i.e., the second direction), and each first rib 22 enters a different contact cavity and is close to the first partition wall 12. The bottom of the first rib 22 is lower than the top of the first partition wall 12, and the first rib 22 is a short rib, its height only slightly greater than the distance between the top of the first partition wall 12 and the inner top surface of the outer shell. Specifically, the height of the first rib 22 is less than 1 mm. Therefore, the height of the first rib 22 can be made very low, so as not to deform the outer shell 2 and keep the outer surface of the outer shell 2 flat, and not to produce welding marks at the position corresponding to the first rib 22. If the first rib 22 is replaced by a baffle with a larger height, the top wall of the shell will deform during injection molding because the two ends of the baffle are free and not connected to other structures of the shell. Once the shell is deformed, problems such as improper assembly or jamming and scrapping are likely to occur during subsequent assembly. The first rib 22 and the first partition wall 12 cooperate to form a barrier, which can isolate the contact splash generated by the contact group segmentation and prevent the contact splash from running into other contact cavities through the gap between the top of the first partition wall 12 and the inner top surface of the shell 2, thereby improving the cleanliness of each contact cavity and improving the reliability of the electrical contact of the present invention.

[0056] In this embodiment, as Figure 8As shown, the magnetic circuit portion 3 is horizontal, and the magnetic circuit portion 3 and the contact portion are arranged along the second direction. The base 1 is provided with a second partition wall 13 for separating the magnetic circuit portion 3 from the contact portion. The second partition wall 13 extends along the first direction, and there are two second partition walls 13 arranged side by side, forming a long groove 14 extending along the first direction between the two second partition walls 13. The inner top surface of the outer shell 2 is provided with a second rib 23 extending along the first direction at a position corresponding to the long groove 14. The second rib 23 is inserted into the long groove 14. In this way, not only can the creepage distance and spatial clearance between the contact portion and the magnetic circuit portion 3 be significantly improved, but the height of the second rib 23 can also be made very low, so as not to deform the outer shell 2, and to keep the outer surface of the outer shell 2 flat, without producing welding marks at the position corresponding to the second rib 23. If there is only one second partition wall 13, in order to ensure that the creepage distance and spatial clearance between the contact part and the magnetic circuit part are large enough, the height of the second rib needs to be made relatively high or a baffle needs to be used instead. This can easily cause deformation and weld marks during the injection molding process of the shell. In this embodiment, the height of the second rib 23 is less than 2mm, and in particular less than or equal to 1.5mm.

[0057] In this embodiment, the magnetic circuit part 3 includes a coil assembly, a yoke 31, an armature 32, and a compression spring 33. The yoke 31 is fixed to the coil assembly. Specifically, the coil assembly includes a coil frame 34, a coil 35 wound around the coil frame 34, and an iron core 36 passing through the coil frame 34. The yoke 31 is L-shaped, and one side of the yoke 31 is riveted to one end of the iron core 36. The free end of the other side of the yoke 31 is provided with a blade edge 313. The compression spring 33 includes a fixing part and a spring piece part 331 provided on the fixing part for providing a restoring force to the armature 32. The fixing part is engaged with the yoke 31, and the fixing part and / or the spring piece part 331 limit the armature 32 at the blade edge 313 of the yoke 31, so that the armature 32 can swing around the blade edge 313 of the yoke 31, and the armature 32 is positioned in the thickness direction of the part of the yoke 31 where the blade edge 313 is located (i.e., Figure 1 The direction of the X-axis in the three-dimensional coordinate system and / or the width direction (i.e., the direction of the width) Figure 1 The yoke 31 is positioned along the Z-axis in a three-dimensional coordinate system. The blade 313 of the yoke 31 is located on the other side of the yoke 31.

[0058] In this embodiment, the fixing part is hollow, and one end of the fixing part is provided with a fitting opening. The fixing part extends from the end where the blade 313 of the yoke 31 is located along the length direction of the part where the blade 313 is located (i.e., Figure 1The armature 32 (located in the direction of the Y-axis in the three-dimensional coordinate system) is fitted outside the yoke 31, and the fixing part is snapped into the yoke 31 when it is in place, so as to prevent the fixing part from disengaging from the yoke 31 in the opposite direction of the fitting direction. The end of the armature 32 that mates with the blade 313 is located inside the fixing part, so as to be limited by the fixing part in the thickness direction and / or width direction of the part where the blade 313 of the yoke 31 is located.

[0059] In this embodiment, the fixing part is provided with a latch 335 (e.g., Figure 12 As shown), the yoke 31 is provided with a slot 311 (as shown). Figure 14 As shown), when the fixing part is fully installed, the latch 335 engages with the slot 311, thereby achieving a snap-fit ​​connection between the fixing part and the yoke 31. The two opposite sides of the yoke 31 are each provided with a limiting step 312 to limit the installation depth of the fixing part. Specifically, the yoke 31 has a limiting step 312 on each of its two sides in the width direction on its other side, as shown... Figure 14 As shown.

[0060] In this embodiment, as Figure 12 As shown, the fixing part has a semi-enclosed frame structure, including a main piece 332 and two side pieces 333. The side pieces 333 are located at opposite ends of the main piece 332 and are arranged opposite each other. The ends of the side pieces 333 away from the main piece 332 are bent inward at 90° or nearly 90° respectively to form two oppositely arranged stop pieces 334, with a gap between the two stop pieces 334. When the fixing part is fitted onto the yoke 31, the main piece 332 and the stop pieces 334 are located on opposite sides of the yoke 31. Specifically, the main piece 332 is located on the side of the yoke 31 away from the coil assembly, and the two stop pieces 334 are located on the side of the yoke 31 facing the coil assembly. One or more of the main plate 332, side plates 333, and stop plate 334 are snapped together with the yoke 31. Specifically, in this embodiment, the main plate 332 is snapped together with the yoke 31, that is, the main plate 332 is provided with the latch 335. The end of the armature 32 that mates with the blade 313 is located between the two side plates 333 and is blocked by the stop plate 334. Therefore, the fixing part can limit the armature 32 in the width and thickness directions on the other side of the yoke 31.

[0061] In this embodiment, a limiting block 322 is provided on each of the two opposite sides of the end of the armature 32 that mates with the blade 313, and a clearance notch 338 is provided on each of the two stop plates 334 (e.g., ...). Figure 12As shown), the two clearance notches 338 are opposite each other. The two limiting blocks 322 enter the fixing part through the two clearance notches 338 respectively, and avoid the clearance notches and are blocked by the stop plate 334 by moving in the opposite direction of the armature 32 along the mounting direction of the fixing part.

[0062] In this embodiment, as Figure 13 As shown, a push arm 321 extends from the end of the armature 32 that engages with the blade 313 toward the end of the armature 32 that engages with the blade 313. The push arm 321 is located on the side of the yoke 31 that is away from the coil assembly, and the spring portion 331 abuts against the push arm 321.

[0063] In this embodiment, as Figure 12 As shown, the fixing part has a limiting piece 336 at its other end opposite to one end, extending along the thickness direction of the yoke 31 where the blade edge 313 is located, towards the side near the coil assembly. This limiting piece 336 engages with the side of the armature 32 facing away from the yoke 31. Specifically, the limiting piece 336 is provided at one of the other two ends of the main body 332. The pushing arm 321 passes through a clearance hole 337 provided in the fixing part. Specifically, the clearance hole 337 is provided in the main body 332 and extends to the limiting piece 336. The spring piece 331 is provided at the end of the limiting piece 336 facing the pushing arm 321 and abuts against the side of the pushing arm 321 facing away from the yoke 31. The spring piece 331 is specifically an inclined sheet-like body, and its free end is bent to form a rounded corner, which contacts the pushing arm 321 to reduce the contact friction between the two. The limiting piece 336 and the spring piece 331 thereon limit the armature 32 in the length direction of the other side of the yoke 31.

[0064] In this embodiment, the push arm 321 cooperates with each moving spring through the push card 6. Specifically, the free end side of the push arm 321 is provided with a protrusion 323 for inserting into the second limiting groove 64 provided at one end of the push card 6.

[0065] In this embodiment, the assembly process of the armature 32, compression spring 33, and yoke 31 is as follows: First, the push arm 321 of the armature 32 passes through the clearance hole 337 from the inside of the main body 332, and the two limiting blocks 322 on the armature 32 are aligned with the clearance notches 338 of the two side bodies 333, respectively. Figure 15 As shown, next, the two limiting blocks 322 on the armature 32 are respectively inserted into the hollow inner cavity through the clearance notch 338, as... Figure 16As shown; then, the entire armature 32 is moved toward the limiting piece 336, so that its two limiting blocks 322 are moved away from the clearance notch 338 and blocked by the two stop pieces 334. At this time, the armature 32 and the limiting piece 336 move closer to each other, and the limiting piece 336 plays a limiting role on the armature 32, as shown. Figure 17 As shown; finally, align the openings formed at the two remaining ends of the main body 332 with the blade edge 313 of the yoke 31 and fit it onto the yoke 31, as shown. Figure 18 As shown in the figure, the arrows indicate the direction of movement of the fixing part. When the entire fixing part is fully fitted into place, the ends of the two side plates 333 that are away from the limiting plate 336 are blocked by the limiting step 312 on the yoke 31. Figure 19 As shown, this limits the fitting depth of the fixing part. Simultaneously, the latch 335 on the main body 332 engages with the slot 311 on the yoke 31, thus preventing the entire fixing part from detaching from the yoke 31 in the opposite direction of the fitting direction. Therefore, the fixing part of the compression spring 33 forms a wrapping state on three or more sides of the yoke 31. Combined with the locking structure, the fixing part of the compression spring 33 is firmly fixed to the yoke 31. After assembly, one end of the armature 32 rests on the blade edge 313 of the yoke 31, and the spring piece 331 abuts against the push arm 321 of the armature 32, creating a magnetic gap between the armature 32 and the other end of the iron core 36 before the coil 35 is energized. Figure 20 As shown. Therefore, the compression spring 33 of the present invention is exempt from riveting to the yoke 31 and the armature 32, thereby simplifying the assembly process of the compression spring 33 and reducing the investment in riveting equipment. In particular, the compression spring 33 not only provides a restoring reaction force to the armature 32, but also provides three-dimensional positioning for the armature 32, greatly improving the installation accuracy of the armature 32 and the working stability of the armature 32, reducing the risk of misalignment or displacement of the armature 32 caused by impacts, drops, etc.

[0066] This invention provides an electromagnetic relay that reduces space occupation. Because the free ends of the moving spring 41 in the normally open contact group 4 and the moving spring 51 in the normally closed contact group 5 face different sides in the second direction, and the moving spring 41 in the normally open contact group 4 extends obliquely towards its contact disconnection direction, when the contact groups are arranged as close as possible to each other, the displacement of the moving spring 51 in the normally closed contact group 5 can occupy a portion of the fulcrum of the moving spring 41 in the normally open contact group 4 (the fulcrum portion of the moving spring 41 moves very little in the direction of movement), thus making the contact groups more compact and reducing the length space of the product. The guide post 21 allows the invention to hold the top wall of the outer casing 2, making the top wall of the outer casing 2 thinner and / or less prone to warping and deformation in large areas, and also preventing bulging and deformation of the top wall of the outer casing 2 due to the pressure difference between the inside and outside of the product after molding.

[0067] The present invention provides an electromagnetic relay that reduces space occupation. The parts not described herein are the same as or can be implemented using existing technologies.

[0068] The above embodiments are only used to further illustrate an electromagnetic relay with reduced space occupation according to the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay with reduced space occupation, comprising a base, a magnetic circuit portion, and a contact portion, wherein the contact portion includes at least one normally open contact group and at least one normally closed contact group, the normally open contact group and the normally closed contact group being arranged on the base along a first horizontal direction, and the free ends of the moving springs of the normally open contact group and the normally closed contact group are respectively provided with moving contacts; the armature of the magnetic circuit portion cooperates with each moving spring by a pusher, so that when the coil of the magnetic circuit portion is energized, the normally open contact group closes and the normally closed contact group opens; characterized in that: The free end of the moving spring of the normally open contact group and the free end of the moving spring of the normally closed contact group are oriented to different sides of a second direction perpendicular to the first direction, and the moving spring of the normally open contact group extends obliquely in the direction of contact disconnection, and / or the moving spring of the normally closed contact group extends obliquely in the direction of contact closure.

2. The space-reducing electromagnetic relay according to claim 1, characterized in that: The normally open contact group and the normally closed contact group are the same component; the moving spring lead of the normally closed contact group and the stationary spring lead of the adjacent normally open contact group are located on one side of the second direction and are offset from each other in the first direction; the stationary spring lead of the normally closed contact group and the moving spring lead of the adjacent normally open contact group are located on the other side of the second direction and are offset from each other in the first direction; the second direction is the horizontal direction.

3. The space-reducing electromagnetic relay according to claim 1, characterized in that: The push card is provided with at least one first limiting groove, and the moving spring of the normally open contact group is inserted into the corresponding first limiting groove; the push card is also provided with at least one pushing claw for pushing the moving spring of the normally closed contact group to move; the push card is also provided with a plurality of partitions arranged along the first direction, each partition being located between two adjacent normally closed contact groups or between two adjacent normally open contact groups or between adjacent normally closed contact groups and normally open contact groups.

4. The space-reducing electromagnetic relay according to claim 1, characterized in that: It also includes a housing with an opening at the bottom, the bottom of which is connected to the base and encloses the magnetic circuit portion, the contact portion and the push card therein; the inner top surface of the housing is provided with at least one guide post extending downward, the bottom of which is inserted and fixed in a corresponding groove or through hole on the base.

5. The space-reducing electromagnetic relay according to claim 4, characterized in that: The portion of the guide post located in the groove or through hole is a thin segment, and the portion above the thin segment is a thick segment; there are multiple guide posts, and the multiple guide posts are arranged in at least one row, with each row located in the first direction.

6. The space-reducing electromagnetic relay according to claim 4 or 5, characterized in that: The bottom of the guide column is fixed to the base by one or more of the following methods: adhesive fixing, hot riveting fixing, and snap-fit ​​connection.

7. The space-reducing electromagnetic relay according to claim 4 or 5, characterized in that: The base is provided with a plurality of contact cavities arranged along the first direction, and adjacent contact cavities are separated by a first partition wall. Each contact cavity is equipped with a normally open contact group or a normally closed contact group. The inner top surface of the outer shell is provided with a plurality of first ribs arranged along the first direction. Each first rib extends in a horizontal direction perpendicular to the first direction and enters a different contact cavity and is close to the first partition wall. The bottom end of the first rib is lower than the top end of the first partition wall.

8. The space-reducing electromagnetic relay according to claim 4 or 5, characterized in that: The base is provided with a second partition wall for separating the magnetic circuit part from the contact part. There are two second partition walls, and a long groove extending along the first direction is formed between the two second partition walls. The inner top surface of the outer shell is provided with a second rib extending along the first direction, and the second rib is inserted into the long groove.

9. The space-reducing electromagnetic relay according to claim 1, characterized in that: The magnetic circuit includes a coil assembly, a yoke, the armature, and a compression spring. The yoke is fixed to the coil assembly. The compression spring includes a fixing part and a spring part disposed on the fixing part for providing a restoring reaction force to the armature. The fixing part is engaged with the yoke, and the fixing part and / or the spring part limit the armature at the blade edge of the yoke, so that the armature swings around the blade edge of the yoke and limits the armature in the thickness direction and / or width direction at the location of the blade edge of the yoke.

10. The space-reducing electromagnetic relay according to claim 9, characterized in that: The fixing part has a hollow inner cavity. The fixing part is fitted onto the yoke from one end where the blade is located along the length of the blade location. When the fixing part is fitted into place, it is snapped into the yoke to prevent the fixing part from detaching from the yoke in the opposite direction of the fitting direction. The two opposite sides of the yoke are respectively provided with limiting steps to limit the fitting depth of the fixing part.

11. The space-reducing electromagnetic relay according to claim 10, characterized in that: The fixing part is semi-enclosed and includes a main body and two side bodies. The side bodies are located at opposite ends of the main body and are arranged opposite each other. The ends of the side bodies away from the main body are bent inward to form two oppositely arranged stop plates. When the fixing part is installed, the main body and the stop plates are located on opposite sides of the yoke. One or more of the main body, side bodies and stop plates are snapped together with the yoke. The end of the armature that mates with the blade is located between the two side bodies and is blocked by the stop plates. The spring plate is located on the main body. A limiting block is provided on each side opposite to the end of the armature that mates with the blade. The two stop plates are provided with clearance notches. The limiting blocks enter the fixing part through the clearance notches and avoid the clearance notches and are blocked by the stop plates by moving in the opposite direction of the mounting direction of the fixing part along with the armature.

12. The space-reducing electromagnetic relay according to claim 9, 10, or 11, characterized in that: The armature has a push arm extending from the end of the armature away from the knife edge toward the end of the armature that mates with the knife edge; the fixing part has a limiting piece extending along the thickness direction of the portion of the yoke where the knife edge is located toward the side close to the coil assembly, the limiting piece mates with the side of the armature opposite to the yoke; the spring piece is located at the end of the limiting piece facing the push arm and abuts against the side of the push arm opposite to the yoke; the push arm passes through a clearance hole provided in the fixing part, the clearance hole extending to the limiting piece.

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