An electromagnetic relay

Abstract

The application discloses an electromagnetic relay, which comprises a body, a magnetic circuit part, a contact part and a pushing card, wherein the magnetic circuit part, the contact part and the pushing card are respectively arranged in the body, and an armature of the magnetic circuit part is linked and matched with a moving spring part of the contact part through the pushing card; the pushing card is located between the moving spring part and an inner side surface of the body, and the pushing card comprises a push rod matched with the moving spring part and a push block arranged at one end of the push rod and matched with the armature, and the push block is located in the extension direction of the length of the push rod. The application not only makes the pushing card more convenient to install, but also makes the matched part of the pushing card and the moving spring part and the matched part of the push rod and the armature not staggered, so that the stress points of the pushing card and the moving spring part and the stress points of the pushing card and the armature are located on or basically located on the same straight line, and the pushing card is not easy to deform in the working process.

Description

Technical Field

[0001] This invention relates to the field of relays, and in particular to an electromagnetic relay. Background Technology

[0002] A relay is an automatic switching element with isolation function, widely used in home appliances, remote control, telemetry, communication, automatic control, mechatronics, and power electronic equipment. It is one of the most important control components, playing roles in automatic adjustment, safety protection, and circuit switching in control circuits. An electromagnetic relay is a relay that uses electromagnetic force to drive the relative movement of mechanical parts to produce a predetermined response. It generally consists of a base, upper shell, magnetic circuit (including the coil itself), and contact parts. The magnetic circuit includes a coil assembly composed of a coil, coil frame, and iron core, a yoke, and an armature. The contact parts include a moving spring and a stationary spring. When current flows through the coil, an electromagnetic force is generated, attracting the armature and causing the moving contact of the moving spring to make contact or disconnect with the stationary contact of the stationary spring. When the current in the coil disappears, the electromagnetic force disappears, the armature returns to its original position, and the moving contact of the moving spring separates from or makes contact with the stationary contact of the stationary spring. The engagement or disengagement of the moving and stationary contacts achieves the purpose of connecting or disconnecting the circuit.

[0003] An existing electromagnetic relay features a coil assembly and a moving spring assembly arranged side-by-side in its magnetic circuit section. The coil assembly is horizontally positioned, and an armature, which can swing laterally, is located on the outer side of one end of the coil's axial direction. The armature engages with the moving spring assembly via a push-lock mechanism. The portion of the push-lock engaging with the moving spring assembly is located on the side of the moving spring assembly closer to the coil assembly in the magnetic circuit section, while the portion engaging with the armature is located on the side of the armature farther from the coil assembly. This makes the push-lock inconvenient to assemble and causes a significant misalignment between the parts engaging with the moving spring and the part engaging with the armature along the length of the push-lock. Consequently, the stress points of the push-lock and the moving spring are not aligned with the stress points of the push-lock and the armature, making the push-lock prone to deformation and even breakage during operation. In particular, when there are many moving springs, the dynamic engagement pressure varies significantly between different groups: the dynamic engagement pressure is higher near the armature and decreases progressively further away, making the push-lock even more susceptible to deformation. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an electromagnetic relay that can solve the problem of easy deformation of the push card.

[0005] The technical solution adopted by the present invention to solve its technical problem is: an electromagnetic relay, including a body, a magnetic circuit part, a contact part, and a pusher card. The magnetic circuit part, the contact part, and the pusher card are respectively installed in the body, and the armature of the magnetic circuit part is linked and cooperates with the moving spring part of the contact part through the pusher card; the pusher card is located between the moving spring part and an inner side of the body, and the pusher card includes a push rod that cooperates with the moving spring part and a push block disposed at one end of the push rod and cooperating with the armature. The push block is located in the extension direction of the push rod.

[0006] Furthermore, the body is provided with a limiting structure, which restricts the movement of the push card toward the inner side.

[0007] Furthermore, the main body includes an upper shell and a base. The base serves as a carrier for the magnetic circuit portion and the contact portion. The upper shell is connected to the base and encloses the magnetic circuit portion, the contact portion, and the push card. The inner side is located on the upper shell. The limiting structure is located on the base.

[0008] Furthermore, the limiting structure includes at least two limiting members, each of which is respectively mounted on the base and protects the push card; the base has a baffle wall located between the moving spring portion and the magnetic circuit portion, each of the limiting members is respectively mounted on the baffle wall, and each of the limiting members partially blocks the side of the push card facing the inner side.

[0009] Furthermore, the retaining wall is provided with a plurality of mounting portions, and at least one end of each limiting member is respectively interference-fitted into the insertion hole provided in the corresponding mounting portion; the limiting member is U-shaped.

[0010] Furthermore, the push rod is provided with a first slot that engages with the moving spring, and the push block is provided with a second slot that engages with the armature. The openings of the first and second slots are respectively located on the side of the push block facing the inner side.

[0011] Furthermore, the push rod is provided with at least one set of reinforcing structures, the reinforcing structures including a plurality of reinforcing ribs spaced apart along the length direction of the push rod, and each reinforcing rib is located in the width direction of the push rod; and / or, the moving spring portion is provided with a limiting groove for restricting the up and down movement of the push rod, the limiting groove extending out at both ends of the push rod in the length direction, and the push clip engaging with the limiting groove.

[0012] Furthermore, the two opposite sides of the second slot are respectively provided with vertical limiting ribs, the surface of which is arc-shaped. The part of the armature located in the second slot is fitted between the limiting ribs on the two sides of the second slot. The number of the first slots is several, and these several first slots are distributed along the length direction of the push rod. The moving spring part includes a rigid spring sheet, a moving spring lead-out sheet, and a reaction spring sheet. The moving spring lead-out sheet is mounted on the body. The upper end of the rigid spring sheet is rotatably connected to the upper end of the moving spring lead-out sheet. A moving contact is provided at the lower end of the rigid spring sheet. The lower end of the reaction spring sheet is fixed to the side of the rigid spring sheet opposite to the moving contact, and there is a gap between the upper end of the reaction spring sheet and the rigid spring sheet. The upper end of the reaction spring sheet and the rigid spring sheet are respectively engaged in the first slot. The push rod is provided with a clearance groove to avoid the moving spring lead-out sheet.

[0013] Furthermore, the magnetic circuit portion includes the armature, the coil assembly, and the yoke disposed on the coil assembly. The coil assembly is horizontally placed within the body and arranged side by side with the movable spring portion. The armature is movably disposed at the blade edge of the yoke and engages with the outer side of one axial end of the coil assembly. The end of the armature facing the inner side is connected to the push card. The number of movable spring portions is several, and these several movable spring portions are spaced apart along the length direction of the push card.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Since the push card is located between the moving spring portion and an inner side of the body, and the push card includes a push rod that cooperates with the moving spring portion and a push block located at one end of the push rod and cooperating with the armature, and the push block is located in the extension direction of the push rod length, the present invention not only makes the push card easier to install, but also enables the force points of the push card and the moving spring portion and the force points of the push card and the armature to be located on or substantially on the same straight line, so that the push card is not easily deformed during operation, and ensures that the service life of the entire electromagnetic relay will not be reduced due to the quality problems of the push card.

[0016] 2. The limiting structure prevents the push card from moving towards the inner side, thereby improving the stability of the electromagnetic relay and reducing the failure rate. This is because, at room temperature, the inner side can limit the push card, but when thermal expansion and contraction occur at extremely high or low temperatures, the dimensions of the relay body fluctuate. Without the limiting structure, the push card could easily slide out towards the inner side, affecting the electrical and mechanical parameters of the relay. Furthermore, the limiting structure pre-positions the push card, making the relay easier to assemble later. The limiting structure includes the limiting component, making push card installation more convenient.

[0017] 3. The limiting member is installed on the retaining wall, which not only does not interfere with the contact part, but also allows the limiting member to be made smaller, saving materials. In particular, the limiting member and the mounting part of the retaining wall of the base are interference-fitted, making the limiting member easy to install.

[0018] 4. The push rod is equipped with the aforementioned reinforcing structure, which makes the push clamp stronger and less prone to deformation.

[0019] 5. The setting of the limiting groove can limit the upper and lower movement of the push card, making the working state of the push card more stable.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0021] Figure 1 This is an exploded view of the electromagnetic relay of the present invention;

[0022] Figure 2 This is a top view of the present invention;

[0023] Figure 3 yes Figure 2 AA section view;

[0024] Figure 4 This is a three-dimensional structural diagram of the electromagnetic relay of the present invention (excluding the upper casing).

[0025] Figure 5 This is a three-dimensional structural diagram of the base of the present invention;

[0026] Figure 6 This is a three-dimensional structural schematic diagram of the limiting member of the present invention;

[0027] Figure 7 This is a three-dimensional structural diagram of the push card of the present invention. Figure 1 ;

[0028] Figure 8 This is a three-dimensional structural diagram of the push card of the present invention. Figure 2 ;

[0029] Figure 9 This is a front view (excluding the upper casing) of the electromagnetic relay of the present invention;

[0030] Figure 10 This is a top view (excluding the upper casing) of the electromagnetic relay of the present invention;

[0031] Figure 11 yes Figure 10 Enlarged schematic diagram of part B in the middle;

[0032] Figure 12This is a side view (excluding the upper casing) of the electromagnetic relay of the present invention;

[0033] Among them, 1. Push card, 11. Push rod, 111. First card slot, 112. Reinforcing rib, 113. Partition, 114. Relief slot, 12. Push block, 121. Second card slot, 122 / 123. Limiting rib, 124. Drive unit, 2. Base, 21. Bar wall, 22. Mounting part, 23. Insertion hole, 3. Limiting component, 31. Stop bar, 32. Insertion rod, 4. Armature, 5. Moving spring part, 51. Moving spring lead-out piece, 52. Rigid spring, 53. Rotating shaft, 54. Flexible connector, 55. Reaction spring, 56. Limiting slot, 6. Stationary spring part, 7. Coil assembly, 8. Yoke, 9. Upper shell, 91. Inner side, 10. Auxiliary moving spring, 20. Auxiliary stationary spring. Detailed Implementation

[0034] For an example, please refer to [link / reference]. Figures 1-12 As shown, an electromagnetic relay of the present invention includes a body, a magnetic circuit portion, a contact portion, and a pusher 1. The magnetic circuit portion, the contact portion, and the pusher 1 are respectively housed within the body. The contact portion includes a moving spring portion 5 and a stationary spring portion 6. The armature 4 of the magnetic circuit portion is connected and engaged with the moving spring portion 5 of the contact portion via the pusher 1. The pusher 1 is horizontal and located between the moving spring portion 5 and an inner side 91 of the body. The pusher 1 includes a push rod 11 that engages with the moving spring portion 5 and a push block 12 that engages with the armature 4 and is disposed at one end of the push rod 11. The push block 12 is located in the extension direction of the length of the push rod 11. In this way, not only is it easier to install the push card 1, but the part of the push card 1 that cooperates with the moving spring part 5 (i.e., the push rod 11) and the part of the push rod 1 that cooperates with the armature 4 (i.e., the push block 12) are not misaligned, so that the force points of the push card 1 and the moving spring part 5 and the force points of the push card 1 and the armature 4 are located on or basically on the same straight line.

[0035] In this embodiment, the main body includes an upper shell 9 and a base 2. The base 2 serves as the carrier for the magnetic circuit portion and the contact portion. The upper shell 9 is connected to the base 2 and encloses the magnetic circuit portion, the contact portion, and the push card 1. The inner side 91 is located on the upper shell 9. The number of movable spring portions 5 and stationary spring portions 6 are several, corresponding one-to-one, and the movable spring portions 5 are spaced apart along the length direction of the push card 1. The magnetic circuit portion specifically includes the armature 4, the coil assembly 7, and the yoke 8 connected to the coil assembly 7. The coil assembly 7 is horizontally placed on the base 2 and movably disposed at the blade edge of the yoke 8, engaging with the armature 4 on the outer side of one axial end. The end of the armature 4 facing the inner side is connected to the push card. Specifically, the coil assembly 7 and the push card 1 are located along the length direction of the base 2, and the coil assembly 7 and the movable spring portions 5 are distributed along the width direction of the base 2. The coil assembly 7 specifically includes an iron core, enameled wire, and a coil frame. The coil frame is horizontally placed on the base 2, the iron core is inserted into the coil frame with both ends exposed, and the enameled wire is wound around the outside of the coil frame. The yoke 8 is L-shaped, with one side fixedly connected to the end of the iron core away from the armature 4 (or it can be integrally formed), and the other side fitting into the side of the coil frame near the moving spring portion 5; the armature 4 is specifically limited by a compression spring at the knife edge on the other side of the yoke 8.

[0036] In this embodiment, the main body is further provided with a limiting structure, which restricts the movement of the push card toward the inner side. Since the main body includes an upper shell 9 and a base 2, the limiting structure is specifically disposed on the base 2. The limiting structure specifically includes at least two limiting members 3, each of which is respectively mounted on the base 2 and protects the push card 1. The number of limiting members 3 is specifically two, but not limited to this.

[0037] In this embodiment, the base 2 has a baffle 21 located between the moving spring portion 5 and the magnetic circuit portion. Each limiting member 3 is respectively mounted on the baffle 21, and each limiting member 3 partially blocks one side of the inner surface of the push card 1. For example... Figure 5 As shown, the retaining wall 21 is provided with a plurality of columnar mounting portions 22, and at least one end of each limiting member 3 is respectively interference-fitted into the insertion hole 23 provided in the corresponding mounting portion 22. The structure of the limiting member 3 is as follows: Figure 6 As shown, the limiting member 3 is generally U-shaped, including a stop bar 31 and two insert rods 32 disposed at both ends of the stop bar 31. The stop bar 31 is located vertically and fits on the side of the push rod 11 facing the inner side. The two insert rods 32 are respectively located above and below the push rod 11 and are respectively interference-fitted into the insertion holes 23 provided in the corresponding mounting part 22. In other embodiments, the limiting member is L-shaped, etc.

[0038] In this embodiment, the push rod 11 is provided with at least one set of reinforcing structures, which include a plurality of reinforcing ribs 112 spaced apart along the length direction of the push rod 11, and each reinforcing rib 112 is located in the width direction of the push rod 11. Specifically, as shown... Figure 7 , Figure 8 As shown, the push rod 11 includes two sets of the reinforcing structures, one set located on the upper surface of the push rod 11 and the other set located on the lower surface of the push rod 11.

[0039] In this embodiment, the moving spring portion 5 is provided with a limiting groove 56 for restricting the up-and-down movement of the push card 1, such as... Figure 9 As shown, the limiting groove 56 extends out from both ends of the push card 1 along its length, and the push rod 11 of the push card 1 is partially engaged in the limiting groove 56.

[0040] In this embodiment, the side of the push rod 11 of the push card 1 facing the inner side 91 is flush with the side of the push block 12 facing the inner side 91, such as... Figure 7 As shown. The push rod 11 has a first slot 111 that engages with the moving spring portion 5, and the push block 12 has a second slot 121 that engages with the armature 4. The openings of the first slot 111 and the second slot 121 are respectively located on the side of the push block 1 that faces away from the inner side 91. Figure 7 , Figure 8 As shown. Since there are several moving spring parts 5, there are also several first slots 111, and each first slot 111 corresponds to one moving spring part 5.

[0041] In this embodiment, as Figure 7 ,like Figure 8 As shown, the second slot 121 has vertical limiting ribs 122 and 123 on its opposite sides. The surfaces of the limiting ribs 122 and 123 are arc-shaped. The portion of the armature 4 located in the second slot 121 fits between the limiting ribs 122 and 123 on the opposite sides of the second slot 121. In this way, the armature 4 pushes the card 1 in a tangential motion, resulting in smooth movement.

[0042] In this embodiment, the push rod 11 is provided with a partition 113 located between the armature 4 and the moving spring portion 5 near the armature 4. In this way, the partition 113 can be used to increase the air gap and creepage distance between the contact portion and the magnetic circuit portion of the relay.

[0043] In this embodiment, the movable spring portion 5 is designed to withstand short-circuit current. Specifically, the movable spring portion 5 includes a movable spring lead-out piece 51, a rigid spring piece 52, and a reaction spring piece 55. The movable spring lead-out piece 51 is inserted into the base 2, and its bottom forms the lead-out foot of the movable spring portion 5. A movable contact is provided on the side of the bottom of the rigid spring piece 52 facing away from the movable spring lead-out piece 51. The upper end of the rigid spring piece 52 is rotatably connected to the upper end of the movable spring lead-out piece 51, allowing the rigid spring piece 52 to rotate in a direction away from or towards the movable spring lead-out piece 51. Specifically, the upper end of the rigid spring piece 52 is connected to the upper end of the movable spring lead-out piece 51 via a rotating shaft 53, and a flexible connector 54 is further connected between the upper end of the rigid spring piece 52 and the upper end of the movable spring lead-out piece 51. The reaction spring 55 is located between the moving spring lead-out piece 51 and the rigid spring 52, with its lower end fixed to the side of the rigid spring 52 facing away from the moving contact. There is a gap between the upper end of the reaction spring 55 and the rigid spring 52. The upper ends of the reaction springs 55 of each moving spring section 5 are respectively engaged with the rigid spring 52 in the corresponding first slots 111. Thus, the pusher 1 pushes the rigid spring 52 towards the stationary spring section 6 by pushing the reaction spring 55, thereby generating overtravel. The push rod 11 is provided with a clearance groove 114 to avoid the moving spring lead-out piece 51, such as... Figure 7 , Figure 8 As shown. Since there are several moving spring portions 5, there are also several clearance grooves 114, which correspond one-to-one with the moving spring lead-out pieces 51 of several moving spring portions 5. The moving spring lead-out pieces 51, rigid spring pieces 52 and reaction spring pieces 55 are respectively provided with the limiting grooves 56.

[0044] In this embodiment, as Figure 4 , Figure 12 As shown, the present invention also includes an auxiliary moving spring 10 with an auxiliary moving contact and an auxiliary stationary spring 20 with an auxiliary stationary contact, both of which are respectively inserted into the base 2 and located on the side where the armature 4 is located; the push block 12 of the push card 1 is provided with a driving part 124, which cooperates with the auxiliary moving spring 10 to drive the auxiliary moving spring 10 to move; the operating state of the auxiliary moving spring 10 is opposite to the operating state of the moving spring part 5. That is, when the moving spring part 5 moves in the direction of attraction, the auxiliary moving spring 10 moves in the direction of disengagement, and when the moving spring part 5 moves in the direction of disengagement, the auxiliary moving spring 10 moves in the direction of attraction.

[0045] In an electromagnetic relay of the present invention, when installing the push card 1, the first card slot 111 and the limiting slot 56 are used to limit the push card 1 in the horizontal (i.e., the length direction of the base 2) and vertical directions, and then each limiting member 3 is inserted to limit the push card 1 in the vertical (i.e., the width direction of the base 2) direction, so as to prevent the push card 1 from sliding out in a direction away from the moving spring part 5.

[0046] The electromagnetic relay of the present invention has a push card 1 located between the moving spring portion 5 and the inner side 91 of the upper shell 9, and the push block 12 of the push card 1 is located in the extension direction of the push rod 11. This makes the push card 1 of the present invention not only easy to install, but also ensures that the push rod 11 and the push block 12 of the push card 1 will not be misaligned in the length direction of the push card 1. This ensures that the force points of the push card 1 and the moving spring portion 5 and the force points of the push card 1 and the armature 4 are on the same straight line, so that the push card 1 is not easily deformed during operation, and ensures that the service life of the entire electromagnetic relay will not be reduced due to the quality problems of the push card 1.

[0047] The limiting structure prevents the push card 1 from sliding laterally away from the moving spring portion 5 (i.e., the direction of the inner side of the groove), thereby improving the stability of the electromagnetic relay and reducing the failure rate. At room temperature, the upper shell 9 of this invention can limit the push card 1. However, the upper shell 9 undergoes thermal expansion and contraction at extremely high and low temperatures, resulting in some dimensional fluctuations. Without the limiting structure (i.e., limiting member 3), the electrical and mechanical parameters of the relay would be affected. Furthermore, before the upper shell 9 is installed, without the limiting structure (i.e., limiting member 3), the position of the push card 1 cannot be stable, making assembly difficult. Therefore, by setting the limiting structure, this invention not only becomes a single unit before the upper shell 9 is installed, facilitating assembly, but also ensures that the push card 1's range of motion in the width direction of the relay is between the moving spring lead-out piece and the limiting member 3. The limiting member 3 effectively limits the push card 1, ensuring that even if the dimensions of the upper shell 9 fluctuate, the mechanical and electrical parameters of the entire relay remain stable.

[0048] The above embodiments are only used to further illustrate an electromagnetic relay of the present invention, but 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, comprising a body, a magnetic circuit portion, a contact portion, and a pusher, wherein the magnetic circuit portion, the contact portion, and the pusher are respectively housed within the body, and the armature of the magnetic circuit portion is linked to the moving spring portion of the contact portion via the pusher; characterized in that: The pusher is located between the movable spring portion and an inner side of the body, and the pusher includes a push rod that cooperates with the movable spring portion and a push block located at one end of the push rod and cooperating with the armature, the push block being located in the extension direction of the push rod length; The main body is provided with a limiting structure, which restricts the movement of the push card toward the inner side; the limiting structure includes at least two limiting members, each of which is respectively mounted on the base of the main body and protects the push rod; the base serves as a carrier for the magnetic circuit part and the contact part, and has a baffle wall located between the moving spring part and the magnetic circuit part, each of the limiting members is respectively mounted on the baffle wall, and each of the limiting members partially blocks the side of the push rod facing the inner side; The push rod is provided with a first slot that engages with the moving spring portion. The moving spring portion includes a rigid spring sheet, a moving spring lead-out sheet, and a reaction spring sheet. The moving spring lead-out sheet is mounted on the body. The upper end of the rigid spring sheet is rotatably connected to the upper end of the moving spring lead-out sheet. A moving contact is provided at the lower end of the rigid spring sheet. The lower end of the reaction spring sheet is fixed to the side of the rigid spring sheet opposite to the moving contact, and there is a gap between the upper end of the reaction spring sheet and the rigid spring sheet. The upper end of the reaction spring sheet and the rigid spring sheet are respectively engaged in the first slot.

2. The electromagnetic relay according to claim 1, characterized in that: The main body includes an upper shell and a base. The upper shell is connected to the base and encloses the magnetic circuit portion, the contact portion, and the push card. The inner side is located on the upper shell.

3. The electromagnetic relay according to claim 1, characterized in that: The retaining wall is provided with a plurality of mounting parts, and at least one end of each limiting member is respectively interference-fitted into the insertion hole provided in the corresponding mounting part; the limiting member is U-shaped.

4. The electromagnetic relay according to claim 1, characterized in that: The push block is provided with a second slot that engages with the armature. The opening of the first slot and the opening of the second slot are respectively located on the side of the push block facing the inner side.

5. The electromagnetic relay according to claim 1, characterized in that: The push rod is provided with at least one set of reinforcing structures, the reinforcing structures including a plurality of reinforcing ribs spaced apart along the length direction of the push rod, and each reinforcing rib is located in the width direction of the push rod.

6. The electromagnetic relay according to claim 1, characterized in that: The moving spring portion is provided with a limiting groove for restricting the up and down movement of the push rod. The limiting groove extends out at both ends of the push rod along its length, and the push rod is engaged in the limiting groove.

7. The electromagnetic relay according to claim 4, characterized in that: The second slot has vertical limiting ribs on its two opposite sides. The surface of the limiting ribs is arc-shaped. The part of the armature located in the second slot is fitted between the limiting ribs on the two sides of the second slot. There are several first slots, which are distributed along the length of the push rod. The push rod has a clearance groove to avoid the moving spring lead-out piece.

8. The electromagnetic relay according to claim 1, characterized in that: The magnetic circuit portion includes the armature, the coil assembly, and the yoke disposed on the coil assembly. The coil assembly is horizontally placed inside the body and is arranged side by side with the moving spring portion. The armature is laterally swingable and is disposed at the blade edge of the yoke, and is engaged with the outer side of one end of the coil assembly in the axial direction. The end of the armature facing the inner side is connected to the push card. The number of moving spring portions is several, and these several moving spring portions are distributed at intervals along the length direction of the push card.

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