Miniaturized electromagnetic relay with high reliability

Abstract

The application discloses a small-sized electromagnetic relay with high reliability, which comprises a moving spring and a pushing block; the moving spring comprises a first spring piece, a second spring piece and a moving contact; the first spring piece and the second spring piece are laminated together, one end of which is provided as a root, and the other end of which is fixed with the moving contact; small tabs are respectively protruded outward at the end of the other end of the first spring piece and the second spring piece; one end of the pushing block is provided with a matching part for corresponding matching with the small tabs of the first spring piece and the second spring piece; the matching part is provided with a first pushing surface for matching with the small tab of the first spring piece and a second pushing surface for matching with the small tab of the second spring piece, and the first pushing surface and the second pushing surface are arranged with a difference. The application can increase the dynamic contact pressure of the contact, increase the contact opening speed (namely, improve the arc extinguishing capacity), and thus improve the reliability of the contact.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to a miniaturized and highly reliable electromagnetic relay. Background Art

[0002] With the continuous development of 5G and green energy-saving buildings, the demand for magnetic latching relays with super-strong lamp load capacity and low power consumption in engineering construction industries such as office buildings and public facilities has rapidly expanded. Products in this field have higher requirements for surge current, large load current characteristics, especially lighting load, product volume, and cost. In order to achieve the large load capacity of the relay, the existing technology usually adopts a bridge magnetic circuit structure, that is, the armature performs a seesaw-like action. This type of relay has a high magnetic efficiency, but the disadvantage is that the armature is an "H"-shaped structure, which has the disadvantages of large size and complex structure. At the same time, the dynamic spring part of this type of relay in the existing technology usually adopts two or more springs stacked and riveted. When the push block cooperates with the dynamic spring, the push block only pushes one spring to achieve the coordination of electromagnetic attraction and the reaction force of the spring. The disadvantage of this coordination structure of the dynamic spring and the push block is that the reaction force of one spring and the contact pressure are relatively small. For load characteristics such as large surge current, the contacts are prone to bonding failure, resulting in poor reliability of the relay.

[0003] In the prior art (such as Chinese patent publication CN208538773U), the push block is usually designed as a square through-slot, and the end of the moving reed is adapted to the square through-slot of the push block, and the push block only pushes one reed movement throughout the entire motion stroke. The specific motion process is as follows: After the relay coil is energized, the armature drives the push block to start moving, and the push block drives the reed to partially move, and the gap between the moving and static contacts gradually decreases. At this stage, the reaction force generated by the reed is relatively small; when the moving and static contacts contact, as the push block continues to move, the end of the moving reed undergoes a large deformation. Because the fulcrum is transformed from the root of the reed to the contact point of the moving and static contacts, the reaction force of the reed is relatively large at this stage, that is, the slope of the reaction force and displacement is larger than that of the previous stage. The push block moves in this state until the end of the entire stroke, so there are two slope segments in the entire stroke. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a miniaturized, highly reliable electromagnetic relay. Through structural improvements, the contact closing pressure can be increased, and the contact opening speed can be increased (that is, the arc extinguishing ability can be improved), thereby improving the reliability of the contact.

[0005] The present invention solves the technical problem by adopting a technical solution: a miniaturized, highly reliable electromagnetic relay comprising a movable spring and a push block; the movable spring comprising a first spring leaf, a second spring leaf, and a movable contact; the first and second spring leaves are stacked together, one end of the stacked first and second spring leaves being a root; the movable contact is fixed to the other end of the stacked first and second spring leaves, and the movable contact is located on the outwardly facing surface of the first spring leaf; the first and second spring leaves each have a small protrusion extending outward from the distal end of the other end; one end of the push block is provided with a mating portion for mating with the small protrusions of the first and second spring leaves, the mating portion comprising a first pushing surface for mating with the small protrusion of the first spring leaf and a second pushing surface for mating with the small protrusion of the second spring leaf, with a step between the first and second pushing surfaces. When the push block pushes the movable spring, a thrust is first applied to the small protrusion of the first spring leaf, and then, after the movable and static contacts make contact, a thrust is simultaneously applied to the small protrusions of the first and second spring leaves.

[0006] The first spring piece is provided with a U-shaped groove surrounding the movable contact at a position next to the fixed movable contact, and the U-shaped opening is provided on a side away from the end of the other end of the first spring piece, so that the end of the other end of the first spring piece can be separated and deformed relative to the movable contact.

[0007] The mating portion of the pushing block is a convex groove, the top surface of the convex groove constitutes the second pushing surface, and the step surface in the middle of the convex groove constitutes the first pushing surface; the small protrusion of the first reed and the small protrusion of the second reed are in a stacked position, with the second reed on top and the first reed on the bottom, the width of the small protrusion of the first reed is A, the width of the small protrusion of the second reed is B, and the following relationship is satisfied: B<A1<A<B1, wherein the width of the top surface of the convex groove is A1, and the width of the step surface in the middle of the convex groove is B1.

[0008] The end of the small protrusion of the first spring is also provided with a bent portion bent downward at 45 degrees to 90 degrees, and the bent portion is hooked outside the convex groove of the pushing block; a U-shaped bent portion is provided in the middle of the first spring.

[0009] The electromagnetic relay also includes a base and a static spring; the dynamic spring also includes a dynamic spring lead-out piece; the static spring and the dynamic spring lead-out piece are respectively installed in the base; the dynamic spring lead-out piece is roughly L-shaped, and the vertical side of the L-shape of the dynamic spring lead-out piece is led outward, and one end of the first and second spring pieces stacked together is riveted to the end of the horizontal side of the L-shape of the dynamic spring lead-out piece to be fixed so that the dynamic contact at the other end of the first and second spring pieces stacked together corresponds to the static contact of the static spring.

[0010] The electromagnetic relay also includes a magnetic circuit part; the magnetic circuit part is installed in the base; the magnetic circuit part includes a coil, an iron core, left and right yokes and an armature rotating block combination; the iron core is installed in the coil, the left and right yokes are respectively fixed at both ends of the iron core, and the armature rotating block combination is provided with a central rotating shaft so that the two ends of the armature rotating block combination can perform a seesaw-like movement around the central rotating shaft; one end of the armature rotating block combination is provided with an I-shaped end, and the other end of the push block is provided with a slot, and the slot at the other end of the push block is twisted in the I-shaped end at one end of the armature rotating block combination.

[0011] The iron core is arranged in the horizontal direction, the armature rotating block assembly is arranged along the installation direction of the iron core, and the pushing block is arranged vertically; the first spring and the second spring stacked together are located below the magnetic circuit part and distributed along the installation direction of the iron core.

[0012] The electromagnetic relay also includes a magnet, and the coil includes a coil frame and an enameled wire; the coil frame includes flanges at both ends and a winding window between the two flanges, the enameled wire is wound in the winding window, and the coil frame is provided with an iron core hole passing through the flanges at both ends, and the iron core is installed in the iron core hole; the coil frame is also provided with a protrusion in the middle section of the winding window, and the protrusion is provided with a magnet mounting hole, and the magnet mounting hole is connected to the iron core hole; the magnet is installed in the magnet mounting hole and contacts the iron core in the iron core hole; a convex tip is provided in the middle of the bottom surface of the armature rotating block assembly, and the convex tip is supported by the magnet, and the central rotating shaft of the armature rotating block assembly is rotatably installed on the protrusion of the coil frame.

[0013] The electromagnetic relay also includes an auxiliary dynamic spring, an auxiliary static spring and an auxiliary pushing block; the auxiliary dynamic spring and the auxiliary static spring are respectively installed in the base, and the auxiliary dynamic contact of the auxiliary dynamic spring is adapted to the auxiliary static contact of the auxiliary static spring; the other end of the armature rotating block assembly is provided with an I-shaped end, and the upper end of the auxiliary pushing block is provided with a slot, and the slot at the upper end of the auxiliary pushing block is twisted into the I-shaped end at the other end of the armature rotating block assembly; the lower end of the auxiliary pushing block is connected to the auxiliary dynamic spring.

[0014] The auxiliary dynamic spring is L-shaped, and the horizontal side of the L-shape of the auxiliary dynamic spring is distributed along a direction perpendicular to the installation direction of the iron core, and the vertical side of the L-shape is installed in the base; the auxiliary dynamic contact is fixed to the free end of the horizontal side of the L-shape of the auxiliary dynamic spring; a square through groove is provided in the horizontal side of the L-shape of the auxiliary dynamic spring corresponding to the inner section of the auxiliary dynamic contact, and a step and a hook head are provided at the lower end of the auxiliary push block; the hook head at the lower end of the auxiliary push block passes through the square through groove of the auxiliary dynamic spring and hooks under the horizontal side of the auxiliary dynamic spring, and the step of the auxiliary push block is limited above the horizontal side of the auxiliary dynamic spring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention adopts a structure in which the first and second springs are provided with small protrusions extending outward from the distal ends of the other ends; one end of the push block is provided with a mating portion for mating with the small protrusions of the first and second springs; the mating portion is provided with a first pushing surface for mating with the small protrusion of the first spring and a second pushing surface for mating with the small protrusion of the second spring, and a step is provided between the first pushing surface and the second pushing surface. When the push block pushes the dynamic spring, a thrust is first applied to the small protrusion of the first spring, and then a thrust is simultaneously applied to the small protrusions of the first and second springs after the dynamic and static contacts make contact. This structure of the present invention can increase both the closing pressure of the contacts and the opening speed of the contacts (i.e., it can improve the arc extinguishing capability), thereby improving the reliability of the contact.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the miniaturized, high-reliability electromagnetic relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the exploded three-dimensional structure of an embodiment of the present invention;

[0019] Figure 2 is a structural cross-sectional view of an embodiment of the present invention;

[0020] Figure 3 1. It is a schematic diagram of the three-dimensional structure of the movable spring and the push block in cooperation with each other according to an embodiment of the present invention;

[0021] Figure 4 This is a front view of the movable spring and the push block in cooperation with each other in an embodiment of the present invention;

[0022] Figure 5 1 is a schematic diagram of the three-dimensional structure of a movable spring (excluding the movable spring lead-out piece) according to an embodiment of the present invention;

[0023] Figure 61. This is a front view of a movable spring (excluding a movable spring lead-out piece) according to an embodiment of the present invention;

[0024] Figure 7 is a schematic diagram of the three-dimensional structure of the first reed according to an embodiment of the present invention;

[0025] Figure 8 is a schematic diagram of the three-dimensional structure of the second reed according to an embodiment of the present invention;

[0026] Figure 9 is a schematic diagram of the three-dimensional structure of a push block according to an embodiment of the present invention;

[0027] Figure 10 is a front view of a push block according to an embodiment of the present invention;

[0028] Figure 11 1 is a schematic exploded perspective view of the three-dimensional structure of a dynamic spring according to an embodiment of the present invention;

[0029] Figure 12 1 is a schematic diagram of a three-dimensional structure of a partial structure (excluding the outer shell) of an embodiment of the present invention;

[0030] Figure 13 It is a front view of a partial structure (with the outer shell removed) of an embodiment of the present invention;

[0031] Figure 14 It is a right side view of a partial structure (with the outer shell removed) of an embodiment of the present invention;

[0032] Figure 15 It is a left side view of a partial structure (with the outer shell removed) of an embodiment of the present invention;

[0033] Figure 16 1 is a schematic diagram of a three-dimensional structure of a partial structure (excluding the housing and the base) of an embodiment of the present invention;

[0034] Figure 17 It is a front view of a partial structure of an embodiment of the present invention (excluding the housing and the base);

[0035] Figure 18 1 is a schematic exploded perspective view of the magnetic circuit portion of an embodiment of the present invention;

[0036] Figure 19 1 is a schematic diagram of the three-dimensional structure of the auxiliary dynamic spring and the auxiliary pushing block according to an embodiment of the present invention;

[0037] Figure 20 It is a schematic diagram of the three-dimensional structure of the base according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Example

[0039] See also Figures 1 to 20As shown, a miniaturized, high-reliability electromagnetic relay of the present invention includes a housing 11, a base 12, a magnetic circuit part 2, a moving spring 3, a pushing block 4 and a static spring 5.

[0040] like Figures 2 to 10 As shown, the movable spring 3 includes a first spring piece 31, a second spring piece 32 and a movable contact 33; the first spring piece 31 and the second spring piece 32 are stacked together, and one end of the first spring piece 31 and the second spring piece 32 stacked together is set as a root 34, and the movable contact 33 is fixed to the other end after the first spring piece 31 and the second spring piece 32 are stacked together, and the movable contact 33 is located on the outward side of the first spring piece 31; the first spring piece 31 is provided with a small protrusion 311 protruding outward at the end of the other end, and the second spring piece 32 is provided with a small protrusion 321 protruding outward at the end of the other end; one end of the pushing block 4 is provided with a The mating portion 41 is used to cooperate with the small protrusions of the first and second reeds. The mating portion 41 is provided with a first pushing surface 42 for cooperating with the small protrusion 311 of the first reed 31 and a second pushing surface 43 for cooperating with the small protrusion 321 of the second reed 32. There is a step difference between the first pushing surface 42 and the second pushing surface 43, so that when the pushing block 4 pushes the dynamic spring 3, a thrust is first applied to the small protrusion 311 of the first reed 31, and after the dynamic and static contacts are in contact, a thrust is simultaneously applied to the small protrusion 311 of the first reed 31 and the small protrusion 321 of the second reed 32.

[0041] In this embodiment, a U-shaped groove 312 surrounding the movable contact is provided in the first reed 31 at a position next to the fixed movable contact, and the U-shaped opening is provided on a side away from the end of the other end of the first reed 31, so that the end of the other end of the first reed 31 can separate and deform relative to the movable contact.

[0042] In this embodiment, the mating portion 41 of the pushing block 4 is a convex groove, the top surface of the convex groove 41 constitutes the second pushing surface 43, and the step surface in the middle of the convex groove 41 constitutes the first pushing surface 42; the small protrusion 311 of the first reed 31 and the small protrusion 321 of the second reed 32 are in a stacked position, and the second reed 32 is on the top and the first reed 31 is on the bottom. The width of the small protrusion 311 of the first reed 31 is A, and the width of the small protrusion 321 of the second reed 32 is B, and the following relationship is satisfied: B<A1<A<B1, wherein the width of the top surface 43 of the convex groove 41 is A1, and the width of the step surface 42 in the middle of the convex groove 41 is B1.

[0043] The end of the small tab 311 of the first spring 31 is further provided with a bending part 313 which is bent downward by 45 degrees to 90 degrees, and the bending part 313 is hooked on the outside of the convex groove 41 of the push block 4; the middle of the first spring 41 is provided with a U-shaped bending part 314.

[0044] In the embodiment, the moving spring 3 further comprises a moving spring leading piece 35; the static spring 5 and the moving spring leading piece 35 are respectively installed in the base 12; the moving spring leading piece 35 is in a substantially L-shaped form, the vertical side 351 of the L-shaped moving spring leading piece 35 is led outwards, and the end (i.e. the root) 34 of the first spring 31 and the second spring 32 which are stacked together is fixed to the end of the horizontal side 352 of the L-shaped moving spring leading piece 35 by riveting, and the other end of the first spring 31 and the second spring 32 which are stacked together is correspondingly matched with the static contact 51 of the static spring 5.

[0045] In the embodiment, the magnetic circuit part 2 is installed in the base 12; the magnetic circuit part 2 comprises a coil 21, an iron core 22, left and right yoke irons 23 and an armature rotating block combination 24; the iron core 22 is installed in the coil 21, the left and right yoke irons 23 are respectively fixed at the two ends of the iron core 22, and the armature rotating block combination 24 is provided with a central rotating shaft 241 so that the two ends of the armature rotating block combination 24 can perform a seesaw action around the central rotating shaft 241; one end of the armature rotating block combination 24 is provided with an I-shaped end part 242, and the other end of the push block 4 is provided with a clamping groove 44, and the clamping groove 44 of the other end of the push block 4 is twisted in the I-shaped end part 242 of one end of the armature rotating block combination 24.

[0046] In the embodiment, the iron core 22 is arranged along the horizontal direction, the armature rotating block combination 24 is arranged along the installation direction of the iron core, and the push block 4 is arranged vertically; the first spring 31 and the second spring 32 which are stacked together are arranged below the magnetic circuit part 2 and are distributed along the installation direction of the iron core 22.

[0047] In this embodiment, the magnetic circuit portion 2 further includes a magnetic steel 25, and the coil 21 includes a coil frame 211 and an enameled wire 212; the coil frame 211 includes flanges 213 at both ends and a winding window between the two flanges, and the enameled wire 212 is wound in the winding window. The coil frame 211 is provided with an iron core hole 214 that passes through the flanges at both ends, and the iron core 22 is installed in the iron core hole 214; the coil frame 211 is also provided with a protrusion 215 in the middle section of the winding window, and the protrusion The protrusion 215 is provided with a magnet mounting hole 216, which communicates with the core hole 214. The magnet 25 is mounted in the magnet mounting hole 216 and contacts the core 22 within the core hole 214. A protrusion 243 is provided in the center of the bottom surface of the armature rotating block assembly 24, supported by the magnet. The central rotation axis 241 of the armature rotating block assembly 24 is rotatably mounted on the protrusion 215 of the coil bobbin 211. The magnet 25 is mounted between the armature and the core 22 of the armature rotating block assembly 24, making the electromagnetic relay of the present invention a latching relay.

[0048] In this embodiment, the electromagnetic relay also includes an auxiliary dynamic spring 6, an auxiliary static spring 7 and an auxiliary pushing block 8; the auxiliary dynamic spring 6 and the auxiliary static spring 7 are respectively installed in the base 12 and the auxiliary dynamic contact 61 of the auxiliary dynamic spring 6 corresponds to the auxiliary static contact 71 of the auxiliary static spring 7; the other end of the armature rotating block assembly 24 is provided with an I-shaped end 244, and the upper end of the auxiliary pushing block 8 is provided with a slot 81, and the slot 81 at the upper end of the auxiliary pushing block 8 is twisted in the I-shaped end 244 at the other end of the armature rotating block assembly 24; the lower end of the auxiliary pushing block 8 is connected to the auxiliary dynamic spring 6.

[0049] In the embodiment, the auxiliary moving spring 6 is in L shape, the horizontal side 62 of the L shape of the auxiliary moving spring is distributed along the direction perpendicular to the mounting direction of the iron core 22, and the vertical side 63 of the L shape of the auxiliary moving spring is mounted in the base 12; the auxiliary moving contact 61 is fixed at the free end of the horizontal side 62 of the L shape of the auxiliary moving spring 6; a square through slot 621 is arranged in the horizontal side 62 of the L shape of the auxiliary moving spring corresponding to the inner section of the auxiliary moving contact; the lower end of the auxiliary pushing block 8 is provided with a step 82 and a hook 83; the hook 83 of the lower end of the auxiliary pushing block 8 hooks under the horizontal side 62 of the auxiliary moving spring 6 through the square through slot 621 of the auxiliary moving spring 6, and the step 82 of the auxiliary pushing block 8 is limited above the horizontal side 62 of the auxiliary moving spring 6. When the auxiliary pushing block 8 moves downward, the step 82 of the auxiliary pushing block 8 pushes the end of the horizontal side 62 of the auxiliary moving spring 6 to move downward, and when the auxiliary pushing block 8 moves upward, the hook 83 of the auxiliary pushing block 8 pushes the end of the horizontal side 62 of the auxiliary moving spring 6 to move upward. The cooperation structure of the auxiliary moving spring 6 and the auxiliary pushing block 8 is simple in assembly, the auxiliary pushing block 8 realizes the six-direction (up and down, left and right, front and back) limiting, the auxiliary pushing block 8 can be avoided from being separated from the auxiliary moving spring 6, and thus the anti-impact and anti-falling ability of the relay is improved.

[0050] The present invention relates to a miniaturized, highly reliable electromagnetic relay. When the magnetic circuit portion 2 is in operation, the push block 4 moves downward. The step surface 42 in the middle of the convex groove 41 of the push block 4 first contacts the upper surface of the small protrusion 311 of the first spring 31, pushing the other end of the stacked first spring 31 and the second spring 32, i.e., the end containing the moving contact 33, to move downward, thereby gradually reducing the gap between the moving and static contacts. During this process, the reaction force of the spring is small, and the portion outside the moving contact at the other end of the first spring 31 and the second spring 32 is initially There is no obvious change in the flat state; when the moving and static contacts begin to contact, the first reed 31 continues to move downward, and the second reed 32 no longer moves because the moving and static contacts are completely in contact. Therefore, the other end of the first reed 31 and the part of the other end of the second reed 32 outside the moving contact gradually separate, that is, the small protrusion 311 of the first reed 31 and the small protrusion 321 of the second reed 32 gradually separate. At the same time, as the pushing block 4 continues to move downward, the groove top surface 43 of the convex groove 41 of the pushing block 4 gradually approaches the small protrusion 321 of the second reed 32. Until contact, in this stage, the first spring 31 has a larger reaction force because the spring deformation fulcrum changes from the dynamic spring head to the contact point; when the pushing block 4 continues to move downward, the groove top surface 43 of the convex groove 41 corresponds to the second spring 32, and the step surface 42 in the middle of the groove of the convex groove 41 corresponds to the first spring 31. The groove top surface 43 of the convex groove 41 of the pushing block 4 and the step surface 42 in the middle of the groove of the convex groove 41 simultaneously push the first spring 31 and the second spring 32 to contact movement. Compared with the previous stage, since the other end of the second spring 32 The part outside the moving contact also deforms, so the reaction force at this stage becomes larger again. Therefore, there are three slope sections in the entire stroke. At the same time, since the end of the second reed 32 is also subjected to thrust, due to the non-hollow structure of the second reed 32 (that is, there is no U-shaped groove 312 similar to the first reed 31), the deformation of the reed 32 will drive the contact to twist, and the moving and static contacts will have obvious misalignment. For large surge currents, contact sticking problems are likely to occur. This contact misalignment method will significantly improve the contact sticking problem, thereby significantly improving the reliability of the relay.

[0051] The present invention provides a miniaturized, highly reliable electromagnetic relay, which adopts the first spring piece 31 and the second spring piece 32, wherein the ends of the other ends are respectively provided with small protrusions 311 and 321 protruding outward; one end of the pushing block 4 is provided with a mating portion 41 for correspondingly mating with the small protrusions 311 and 321 of the first spring piece 31 and the second spring piece 32, and the mating portion 41 is provided with a first pushing surface 42 for mating with the small protrusion 311 of the first spring piece 41 and a second pushing surface 43 for mating with the small protrusion 321 of the second spring piece 32, and a step is set between the first pushing surface 42 and the second pushing surface 43, so that when the pushing block 4 pushes the dynamic spring 3, the thrust is first applied by the small protrusion 311 of the first spring piece 31, and after the dynamic and static contacts come into contact, the thrust is applied simultaneously by the small protrusion 311 of the first spring piece 31 and the small protrusion 321 of the second spring piece 32. The structure of the present invention can increase the closing pressure of the contacts and the opening speed of the contacts (ie, it can improve the arc extinguishing capability), thereby improving the reliability of the contacts.

[0052] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A miniaturized, highly reliable electromagnetic relay comprising a movable spring and a pusher block; the movable spring comprising a first spring leaf, a second spring leaf, and a movable contact; the first spring leaf and the second spring leaf are stacked together, one end of the stacked first and second spring leaves being a root; the movable contact is fixed to the other end of the stacked first and second spring leaves, and is located on the outward-facing surface of the first spring leaf; and characterized in that: The first and second springs have small protrusions protruding outward from the ends of the other ends respectively; one end of the pushing block is provided with a matching portion for correspondingly matching with the small protrusions of the first and second springs, and the matching portion is provided with a first pushing surface for matching with the small protrusion of the first spring and a second pushing surface for matching with the small protrusion of the second spring, and there is a step between the first pushing surface and the second pushing surface, so that in the process of the pushing block pushing the dynamic spring, a thrust is first applied to the small protrusion of the first spring, and then a thrust is applied to the small protrusions of the first and second springs at the same time after the dynamic and static contacts come into contact.

2. The miniaturized, high-reliability electromagnetic relay according to claim 1, characterized in that: The first spring piece is provided with a U-shaped groove surrounding the movable contact at a position next to the fixed movable contact, and the U-shaped opening is provided on a side away from the end of the other end of the first spring piece, so that the end of the other end of the first spring piece can be separated and deformed relative to the movable contact.

3. The miniaturized, high-reliability electromagnetic relay according to claim 1 or 2, characterized in that: The mating portion of the pushing block is a convex groove, the top surface of the convex groove constitutes the second pushing surface, and the step surface in the middle of the convex groove constitutes the first pushing surface; the small protrusion of the first reed and the small protrusion of the second reed are in a stacked position, with the second reed on top and the first reed on the bottom, the width of the small protrusion of the first reed is A, the width of the small protrusion of the second reed is B, and the following relationship is satisfied: B<A1<A<B1, wherein the width of the top surface of the convex groove is A1, and the width of the step surface in the middle of the convex groove is B1.

4. The miniaturized, high-reliability electromagnetic relay according to claim 3, characterized in that: The end of the small protrusion of the first spring is also provided with a bent portion bent downward at 45 degrees to 90 degrees, and the bent portion is hooked outside the convex groove of the pushing block; a U-shaped bent portion is provided in the middle of the first spring.

5. The miniaturized, high-reliability electromagnetic relay according to claim 3, characterized in that: The electromagnetic relay also includes a base and a static spring; the dynamic spring also includes a dynamic spring lead-out piece; the static spring and the dynamic spring lead-out piece are respectively installed in the base; the dynamic spring lead-out piece is roughly L-shaped, and the vertical side of the L-shape of the dynamic spring lead-out piece is led outward, and one end of the first and second spring pieces stacked together is riveted to the end of the horizontal side of the L-shape of the dynamic spring lead-out piece to be fixed so that the dynamic contact at the other end of the first and second spring pieces stacked together corresponds to the static contact of the static spring.

6. The miniaturized, high-reliability electromagnetic relay according to claim 5, characterized in that: The electromagnetic relay also includes a magnetic circuit part; the magnetic circuit part is installed in the base; the magnetic circuit part includes a coil, an iron core, left and right yokes and an armature rotating block combination; the iron core is installed in the coil, the left and right yokes are respectively fixed at both ends of the iron core, and the armature rotating block combination is provided with a central rotating shaft so that the two ends of the armature rotating block combination can perform a seesaw-like movement around the central rotating shaft; one end of the armature rotating block combination is provided with an I-shaped end, and the other end of the push block is provided with a slot, and the slot at the other end of the push block is twisted in the I-shaped end at one end of the armature rotating block combination.

7. The miniaturized, high-reliability electromagnetic relay according to claim 6, characterized in that: The iron core is arranged in the horizontal direction, the armature rotating block assembly is arranged along the installation direction of the iron core, and the pushing block is arranged vertically; the first spring and the second spring stacked together are located below the magnetic circuit part and distributed along the installation direction of the iron core.

8. The miniaturized, high-reliability electromagnetic relay according to claim 6 or 7, characterized in that: The electromagnetic relay also includes a magnet, and the coil includes a coil frame and an enameled wire; the coil frame includes flanges at both ends and a winding window between the two flanges, the enameled wire is wound in the winding window, and the coil frame is provided with an iron core hole passing through the flanges at both ends, and the iron core is installed in the iron core hole; the coil frame is also provided with a protrusion in the middle section of the winding window, and the protrusion is provided with a magnet mounting hole, and the magnet mounting hole is connected to the iron core hole; the magnet is installed in the magnet mounting hole and contacts the iron core in the iron core hole; a convex tip is provided in the middle of the bottom surface of the armature rotating block assembly, and the convex tip is supported by the magnet, and the central rotating shaft of the armature rotating block assembly is rotatably installed on the protrusion of the coil frame.

9. The miniaturized, high-reliability electromagnetic relay according to claim 6, characterized in that: The electromagnetic relay also includes an auxiliary dynamic spring, an auxiliary static spring and an auxiliary pushing block; the auxiliary dynamic spring and the auxiliary static spring are respectively installed in the base, and the auxiliary dynamic contact of the auxiliary dynamic spring is adapted to the auxiliary static contact of the auxiliary static spring; the other end of the armature rotating block assembly is provided with an I-shaped end, and the upper end of the auxiliary pushing block is provided with a slot, and the slot at the upper end of the auxiliary pushing block is twisted into the I-shaped end at the other end of the armature rotating block assembly; the lower end of the auxiliary pushing block is connected to the auxiliary dynamic spring.

10. The miniaturized, high-reliability electromagnetic relay according to claim 9, characterized in that: The auxiliary dynamic spring is L-shaped, and the horizontal side of the L-shape of the auxiliary dynamic spring is distributed along a direction perpendicular to the installation direction of the iron core, and the vertical side of the L-shape is installed in the base; the auxiliary dynamic contact is fixed to the free end of the horizontal side of the L-shape of the auxiliary dynamic spring; a square through groove is provided in the horizontal side of the L-shape of the auxiliary dynamic spring corresponding to the inner section of the auxiliary dynamic contact, and a step and a hook head are provided at the lower end of the auxiliary push block; the hook head at the lower end of the auxiliary push block passes through the square through groove of the auxiliary dynamic spring and hooks under the horizontal side of the auxiliary dynamic spring, and the step of the auxiliary push block is limited above the horizontal side of the auxiliary dynamic spring.

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