An electromagnetic relay for preventing a push card from falling off

Abstract

The invention discloses an electromagnetic relay with a push card for preventing from falling off, comprising a base, a contact part and a magnetic circuit part arranged on the base, wherein the contact part comprises a moving spring and a static spring, and the contact part comprises a coil, an iron core, a yoke iron and an armature, wherein the armature cooperates with the moving spring through the push card; a supporting part of the push card is arranged on the base, a guide rail is arranged on the supporting part along the moving direction of the push card, a limit block is arranged on the guide rail, a long strip guide groove penetrating up and down is arranged on the push card along its moving direction, an allowance hole adapted to the limit block is formed in the guide groove, the guide groove is sleeved on the guide rail, the limit block passes through the allowance hole upward, and remains misaligned with the allowance hole after the push card is assembled. The invention improves the assembly and positioning method of the previous push card, not only does the assembly process not generate hair scraps, ensures the cleanliness of the inside of the relay, but also prevents the push card from falling off and improves the vibration resistance of the relay.

Description

Technical Field

[0001] The invention relates to an electromagnetic relay, in particular to an electromagnetic relay which can prevent a push card from falling off, resist vibration and generate no plastic chips. Background Art

[0002] The basic working principle of an electromagnetic relay is to convert electrical energy into magnetic energy and then into mechanical energy, using mechanical energy to connect and disconnect the controlled circuit to achieve the function of "relay".

[0003] In traditional relay design, the positioning of the intermediate mechanism (push card) of the relay is often achieved through two parts that interact with the push card: the movable spring and the armature. In this structure, in order to effectively position the push card, the movable spring and the armature are often required to position the push card in all directions, front, back, left, and right. In this way, the blanking edges of metal parts such as the movable spring and the armature often need to directly contact the plastic push card. During the assembly process and the mechanical action of the relay, the blanking edges of the movable spring and the armature rub against the plastic push card, and it is difficult to avoid the pollution of plastic powder.

[0004] Although many relays have made design improvements in details, such as flanging the movable spring part that contacts the push card to avoid direct friction between the punching edge and the push card, this improvement is very limited, and the process is complex, the cost is low, and the effect is poor. Summary of the invention

[0005] The present invention provides an electromagnetic relay for preventing a push card from falling off, which overcomes the shortcomings of the electromagnetic relay described in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an electromagnetic relay with a push card to prevent it from falling off, comprising a base, a contact part and a magnetic circuit part arranged on the base, the contact part comprising a moving spring and a static spring, the contact part comprising a coil, an iron core, a yoke iron, and an armature, and the armature cooperates with the moving spring through the push card; a supporting part of the push card is provided on the base, a guide rail is provided on the supporting part along the movement direction of the push card, a limit block is provided on the guide rail, and a long strip guide groove penetrating up and down is provided on the push card along its movement direction, an allowance hole adapted to the limit block is formed in the guide groove, the guide groove is sleeved on the guide rail, the limit block passes through the allowance hole upward, and remains misaligned with the allowance hole after the push card is assembled.

[0007] Furthermore, at least one set of clamping structures is provided in the guide groove, and the clamping structure includes two convex parts arranged opposite to each other. The two convex parts are respectively located on the two inner side surfaces in the length direction of the guide groove, and are respectively contacted and matched or clearance matched with the two side surfaces in the length direction of the guide rail.

[0008] Furthermore, a sliding structure is provided between the support portion and the push card to reduce contact friction between the two.

[0009] Furthermore, the number of the sliding structures is at least two groups, and they are distributed along the movement direction of the pushing card. The sliding structure includes two first ribs arranged on the supporting portion along a direction perpendicular to the movement direction of the pushing card and located on opposite sides of the guide rail, and two second ribs arranged on the bottom surface of the pushing card along the movement direction of the pushing card and located on opposite sides of the guide groove. The top surfaces of the two first ribs are in one-to-one contact and cooperation with the bottom surfaces of the two second ribs.

[0010] Furthermore, the top surface of the first convex rib is an upward convex arc surface, and the bottom surface of the second convex rib is a downward convex arc surface.

[0011] Furthermore, a baffle is provided on the top of the guide rail, and one end of the guide groove in the length direction is open, and the end portion of the push card corresponding to the opening is divided into two separate parts, and the two parts are respectively matched at the lower side of the baffle.

[0012] Furthermore, the limit block and the baffle are respectively located at two ends of the guide rail in the length direction, and / or a reinforcing plate is connected between the top surfaces of the two parts, and the reinforcing plate is fitted on the outside of the baffle.

[0013] Furthermore, the push card has a side plate at one end close to the armature, which is fitted on the outside of the support portion and contacts and cooperates with the armature so that the connection can only push the push card to move in one direction; a slot or a hole is provided on the bottom surface of the push card for the tail end of the movable spring to be inserted.

[0014] Furthermore, the cross-sections of the limit block and the accommodating hole are both in the shape of a cross.

[0015] Furthermore, the armature is assembled on the yoke cutting edge through a compression spring and can reciprocate around the yoke cutting edge; the static spring includes a normally open static spring and a normally closed static spring, and the dynamic spring is fitted between the normally open static spring and the normally closed static spring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The support part and the guide rail and limit block thereon are arranged in coordination with the guide groove and the allowance hole on the push card, which improves the previous assembly and positioning method of the push card. Not only does the assembly process not generate hair scraps, ensuring the cleanliness of the inside of the relay, but it can also prevent the push card from falling off and improve the vibration resistance of the relay.

[0018] 2. The arrangement of the clamping structure can make the push card and the guide rail of the support part cooperate more closely, so that the movement of the push card is smoother and more stable. In particular, the first slide groove, the first slider, the second slide groove, and the second slider constitute two sets of sliding guide structures, and the sliders and slide grooves are alternately arranged on the push card and the body, so as to further improve the positioning effect of the push card.

[0019] 3. The setting of the sliding structure enables the support part and the push card to achieve point and line coordination, thereby reducing the contact friction between the two, making the movement of the push card smoother and preventing jamming.

[0020] 4. The setting of the baffle plate in conjunction with the limit block can provide a more comprehensive limit for the push card, making the push card move more stably and preventing it from falling off better.

[0021] 5. The central symmetric style of the support part allows the mold design to only require left and right core pulling, with more design cavities and higher production efficiency.

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the electromagnetic relay for preventing a push card from falling off of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the base of the present invention;

[0025] Figure 3 The structure of the push card of the present invention is shown in FIG. Figure 1 (Reflect positive);

[0026] Figure 4 The structure of the push card of the present invention is shown in FIG. Figure 2 (Reflect the back)

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention (excluding the shell). DETAILED DESCRIPTION

[0028] For examples, see Figure 1-Figure 5 As shown, an electromagnetic relay with a push card to prevent disengagement of the present invention includes a housing 20, a base, a contact part and a magnetic circuit part arranged on the base, the contact part includes a moving spring 3 and a static spring, the magnetic circuit part includes a coil 5, an iron core 6, a yoke 7, and an armature 8, and the armature 8 cooperates with the moving spring 3 through a push card 10.

[0029] In this embodiment, the coil 5 is arranged at the rear of the base 1, the iron core 6 is inserted into the through hole arranged in the middle of the coil 5, the yoke 7 is L-shaped, and one side of the yoke 7 is connected to the top of the iron core 6, the other side of the tail end of the yoke 7 is provided with a knife edge, and the bottom end of the iron core 6 is provided with a pole surface. The armature 8 is assembled on the knife edge of the yoke 7 through the compression spring 9 and can reciprocate around the knife edge of the yoke 7; the armature 8 is L-shaped, and one side of the armature 8 is matched with the pole surface of the iron core 6, and the other side of the tail end of the armature 8 is matched with the push card 10. The contact part is arranged at the front of the base 1, and the static spring includes a normally open static spring 2 and a normally closed static spring 4, and the dynamic spring 3 is matched between the normally open static spring 2 and the normally closed static spring 4. The top of the base 1 is matched with the push card 10 with the sliding guide structure. The shell 20 is connected to the base 1, and contains the magnetic circuit part, the push card 10, and the contact part in its shell cavity.

[0030] In this embodiment, a support part 11 of a push card is provided at the top of the front part of the base 1, a guide rail 111 is provided on the support part 11 along the moving direction of the push card, a stop block 112 is provided on the guide rail 111, a long strip guide groove 101 is provided on the push card 10 along its moving direction, a tolerance hole 102 adapted to the stop block 112 is formed in the guide groove 101, the guide groove 101 is sleeved on the guide rail 111, the stop block 112 passes through the tolerance hole 102 upwards, and remains misaligned with the tolerance hole 102 after the push card 10 is assembled. The cross-sections of the stop block 112 and the tolerance hole 102 are both in a "cross" shape, but are not limited thereto.

[0031] In this embodiment, two groups of clamping structures are provided in the guide groove 101 (the number of the clamping structures is not limited to two groups, and may be one group or more than two groups), the two groups of clamping structures are distributed along the movement direction of the push card 10, and each group of clamping structures includes two convex parts 103 arranged opposite to each other, the two convex parts 103 are respectively located on the two inner side surfaces in the length direction of the guide groove 101, and are respectively in one-to-one contact or clearance fit with the two side surfaces in the length direction of the guide rail 111, so that the guide groove 101 and the guide rail 111 are more closely matched, so as to make the movement of the push card 10 more stable. The convex part 103 is specifically a convex bud structure, but is not limited thereto.

[0032] In this embodiment, a sliding structure is also provided between the support portion 11 and the push card 10 to reduce the contact friction between the two. The sliding structures are in two groups and are distributed along the movement direction of the push card 10. Each group of sliding structures includes two first convex ribs 113 / 114 provided on the support portion 11 perpendicular to the movement direction of the push card 10 and located on opposite sides of the guide rail 111, and two second convex ribs 105 / 106 provided on the bottom surface of the push card 10 along the movement direction of the push card 10 and located on opposite sides of the guide groove 101. The top surfaces of the two first convex ribs 113 / 114 are in one-to-one contact with the bottom surfaces of the two second convex ribs 105 / 106. The top surface of the first convex rib 113 / 114 is an upward convex arc surface, and the bottom surface of the second convex rib 105 / 106 is a downward convex arc surface. In this way, as the push card 10 moves, the second convex rib 105 / 106 and the corresponding first convex rib 113 / 114 achieve point and line coordination, which can greatly reduce the contact friction between the push card 10 and the supporting part 11, making the push card 10 move more smoothly.

[0033] In this embodiment, a baffle 115 is further provided on the top of the guide rail 111, and one end of the guide groove 101 in the length direction is open, and the end portion of the push card 10 corresponding to the opening is divided into two separate parts, and the two parts are respectively matched at the lower side of the baffle 115, and a U-shaped reinforcing plate 104 is connected between the top surfaces of the two parts, and the reinforcing plate 104 is matched at the outside of the baffle 115. The limit block 112 and the baffle 115 are respectively located at the two ends of the guide rail 111 in the length direction.

[0034] In this embodiment, the end of the push card 10 close to the armature has a side plate 107, which is matched with the outer side of the support portion 11 and contacts and cooperates with the armature 8, so that the connection 8 can only push the push card 10 to move in one direction. Specifically, a positioning groove 108 is provided on the outer side of the side plate 107 for the tail end of the armature 8 to lean against and can limit the shaking of the armature 8. A slot 109 (the slot 109 can also be replaced by a jack) is provided on the bottom surface of the push card 10 for the tail end of the movable spring 3 to be inserted.

[0035] In this embodiment, there are two groups of contact parts, which are symmetrically designed. Therefore, two slots 109 are correspondingly arranged on the bottom surface of the push card 10, corresponding to the movable springs 3 of the two groups of contact parts.

[0036] The electromagnetic relay with a push card to prevent disengagement of the present invention, when assembling, first assemble the normally open static spring 2, the dynamic spring 3, and the normally closed static spring 4 on the base 1, and then align the allowance hole 102 on the push card with the limit block 112 on the guide rail 111 of the support part 11 and insert it, and at the same time, align the slot 109 on the push card with the tail of the dynamic spring 3 and insert it, due to the reaction force of the dynamic spring 3, the end of the push card 10 away from the armature will enter between the baffle 115 and the support part 11, and the limit block 112 remains misaligned with the allowance hole 102, so that the push card 10 can be kept on the guide rail 111 of the support part 11 without falling off, and can minimize the scratching of the push card 10 with metal parts during its movement, effectively reduce the generation of plastic powder pollutants, and improve the vibration resistance of the product. Since the core structure of the entire relay is positioned with the base 1 as the carrier, the cumulative error of assembly can be avoided, and the consistency of relay product assembly can be improved.

[0037] The electromagnetic relay with a push card to prevent disengagement of the present invention has the following working principle: when the magnetic circuit part is energized and excited, the armature 8 moves under the action of the magnetic force, pushing the push card 10 to move forward, and then the push card 10 drives the movable spring 3 to move forward and contact with the normally open static spring 2, thereby connecting the normally open electrical circuit; when the magnetic circuit part is not energized and excited, the movable spring 3 returns to contact with the normally closed static spring 4 under the action of its own reaction force, thereby connecting the normally closed electrical circuit, and at the same time, the armature 8 is released to the initial position by the push card 10.

[0038] The above embodiments are only used to further illustrate an electromagnetic relay for preventing a push card from falling off of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay with a push card to prevent it from falling off, comprising a base, a contact part arranged on the base and a magnetic circuit part, wherein the contact part comprises a moving spring and a static spring, and the contact part comprises a coil, an iron core, a yoke iron and an armature, wherein the armature cooperates with the moving spring through a push card; characterized in that: A supporting part of a pushing card is provided on the base, a guide rail is provided on the supporting part along the moving direction of the pushing card, a limit block is provided on the guide rail, a long strip guide groove is provided on the pushing card along its moving direction, an accommodation hole adapted to the limit block is formed in the guide groove, the guide groove is sleeved on the guide rail, and the limit block passes upward through the accommodation hole; a slot or a plug hole is provided on the bottom surface of the pushing card for the tail end of the moving spring to be inserted; when assembling the pushing card, the accommodation hole on the pushing card is first aligned with the limit block on the guide rail of the supporting part and inserted, and at the same time, the slot or the plug hole set on the pushing card is aligned with the tail end of the moving spring and inserted, and after the pushing card is assembled, the pushing card keeps its accommodation hole misaligned with the limit block under the action of the moving spring; the magnetic circuit part is a vertical magnetic circuit.

2. The electromagnetic relay for preventing the push card from falling off according to claim 1, characterized in that: At least one clamping structure is provided in the guide groove, and the clamping structure includes two convex parts arranged opposite to each other. The two convex parts are respectively located on the two inner side surfaces in the length direction of the guide groove, and are respectively in contact with or clearance fit with the two side surfaces in the length direction of the guide rail.

3. The electromagnetic relay for preventing the push card from falling off according to claim 1, characterized in that: The support portion and the push card are also matched with a sliding structure for reducing contact friction between the two.

4. The electromagnetic relay for preventing the push card from falling off according to claim 3, characterized in that: The number of the sliding structures is at least two groups, and they are distributed along the movement direction of the push card. The sliding structure includes two first convex ribs arranged on the support portion along a direction perpendicular to the movement direction of the push card and located on opposite sides of the guide rail, and two second convex ribs arranged on the bottom surface of the push card along the movement direction of the push card and located on opposite sides of the guide groove. The top surfaces of the two first convex ribs are in one-to-one contact with the bottom surfaces of the two second convex ribs.

5. The electromagnetic relay for preventing the push card from falling off according to claim 4, characterized in that: The top surface of the first convex rib is an upward convex arc surface, and the bottom surface of the second convex rib is a downward convex arc surface.

6. The electromagnetic relay for preventing the push card from falling off according to claim 1, characterized in that: The top of the guide rail is also provided with a baffle, and one end of the guide groove in the length direction is open, and the end portion of the push card corresponding to the opening is divided into two separate parts, and the two parts are respectively matched at the lower side of the baffle.

7. The electromagnetic relay for preventing the push card from falling off according to claim 6, characterized in that: The limit block and the baffle are respectively located at two ends of the guide rail in the length direction, and / or a reinforcing plate is connected between the top surfaces of the two parts, and the reinforcing plate is matched on the outside of the baffle.

8. The electromagnetic relay for preventing the push card from falling off according to claim 1, characterized in that: The end of the push card close to the armature has a side plate, which is matched with the outer side of the support part and contacts and cooperates with the armature, so that the connection can only push the push card to move in one direction.

9. The electromagnetic relay for preventing the push card from falling off according to claim 1, characterized in that: The cross sections of the limit block and the accommodation hole are both in the shape of a cross.

10. The electromagnetic relay for preventing the push card from falling off according to claim 1, characterized in that: The armature is assembled on the yoke blade by a compression spring and can reciprocate around the yoke blade; the static spring includes a normally open static spring and a normally closed static spring, and the dynamic spring is fitted between the normally open static spring and the normally closed static spring.

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