Relay anti-short circuit structure and relay

Abstract

The utility model discloses a relay anti-short-circuit structure and a relay, the relay anti-short-circuit structure comprises a first magnetizer installed on a relay base and a second magnetizer installed on a movable spring part of the relay, the first magnetizer and the second magnetizer are oppositely arranged, and when a movable contact and a static contact of a relay contact part are closed, the first magnetizer and the second magnetizer are separated from each other. The first magnetizer and the second magnetizer are configured to be close to each other and form a magnetic conductive loop, and an air gap is reserved between the first magnetizer and the second magnetizer. According to the utility model, when the moving contact and the static contact of the relay contact part are closed, the first magnetizer and the second magnetizer are close to each other and form a magnetic conduction loop; and a magnetic attraction force which is enough to resist an electric repulsive force between the moving contact and the static contact is generated between the first magnetizer and the second magnetizer, so that the moving contact and the static contact are kept in contact and are not bounced off by the electric repulsive force.

Description

TECHNICAL FIELD

[0001] The utility model relates to relay technical field, concretely relates to a relay anti short circuit structure and relay. BACKGROUND

[0002] Relay is a kind of electronic control device, it has control system (also called input loop) and controlled system (also called output loop), usually applied in automatic control circuit. Relay is actually a kind of " automatic switch " with smaller current to control larger current. Therefore in circuit play the role of automatic regulation, safety protection, conversion circuit. However, when large current passes through contact component, strong electrodynamic repulsion will be generated at contact loop, and this electrodynamic repulsion can bounce off moving contact, and moving contact generates opening when it should not open, and more seriously, the arc generated when moving contact bounces off can burn relay. SUMMARY

[0003] In view of the deficiency of prior art, the utility model provides a relay anti short circuit structure, when the moving contact of relay contact point part and static contact close, first magnetically conductive body and second magnetically conductive body are close to each other and constitute magnetically conductive loop, so that when large current passes through the current-carrying component of relay, the magnetic attraction force between first magnetically conductive body and second magnetically conductive body is enough to resist the electrodynamic repulsion between moving contact and static contact, so that moving contact and static contact keep contact and are not bounced off by electrodynamic repulsion.

[0004] To achieve the above purpose, the utility model is realized by the following technical schemes:

[0005] A kind of relay anti short circuit structure, including first magnetically conductive body installed on the base of relay and second magnetically conductive body installed on the moving spring component of relay, first magnetically conductive body and second magnetically conductive body are oppositely arranged, when the moving contact of relay contact point part and static contact close, first magnetically conductive body and second magnetically conductive body are configured to be close to each other and constitute magnetically conductive loop and there is air gap between first magnetically conductive body and second magnetically conductive body.

[0006] Further, one of first magnetically conductive body and second magnetically conductive body is flat sheet structure, and the other is U-shaped structure, and the opening end of the magnetically conductive body of U-shaped structure faces the magnetically conductive body of flat sheet structure.

[0007] Further, the first magnetically conductive body fixedly arranged on the base of relay is flat sheet structure, and the second magnetically conductive body fixedly arranged on the moving spring component of relay is U-shaped structure.

[0008] Further, the second magnetically conductive body is fixedly installed on the bridge type moving contact of moving spring component.

[0009] Further, the second magnetically conductive body is fixedly installed at the middle position of bridge type moving contact.

[0010] Further, the second magnetic conductor and the bridge moving contact are fixedly connected by riveting or resistance welding.

[0011] Further, the air gap spacing between the first magnetic conductor and the second magnetic conductor is configured to: when the current-carrying part of the relay passes through the short-circuit current, the magnetic field generated at the bridge moving contact magnetizes the first magnetic conductor and the second magnetic conductor, so that a magnetic attraction force sufficient to resist the electric repulsion between the moving contact and the static contact is generated between the first magnetic conductor and the second magnetic conductor.

[0012] Further, the direction of action of the magnetic attraction force is consistent with the direction of movement of the moving contact close to the static contact to form a closure.

[0013] Further, the second magnetic conductor is provided with a bent extension corresponding to the first magnetic conductor for increasing the pole shoe surface between the first magnetic conductor and the second magnetic conductor.

[0014] Based on the same inventive concept, the utility model also provides a relay, including relay base, moving spring part, static spring part and any one of the relay short circuit resistance structure above which is arranged on the relay base, wherein the relay base is provided with a magnetic conductor slot, and the first magnetic conductor of the relay short circuit resistance structure is inserted and fixed in the magnetic conductor slot.

[0015] The above technical scheme has the following advantages or beneficial effects:

[0016] In the relay short circuit resistance structure and the relay, the first magnetic conductor and the second magnetic conductor are respectively arranged on the relay base and the moving spring part of the relay, so that when the moving contact and the static contact of the relay contact part are closed, the first magnetic conductor and the second magnetic conductor are close to each other and form a magnetic conducting loop, and when a large current passes through the current-carrying part of the relay, a magnetic attraction force sufficient to resist the electric repulsion between the moving contact and the static contact is generated between the first magnetic conductor and the second magnetic conductor, so that the moving contact and the static contact remain in contact and are not repelled by the electric repulsion, effectively avoiding the misoperation of the moving contact, improving the short-circuit current resistance performance of the relay, and preventing the relay from being burned out or exploded under the action of strong electric arc. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic diagram of the relay of the utility model embodiment one.

[0018] Figure 2 It is a three-dimensional structure schematic diagram of the relay short circuit resistance structure of the utility model embodiment one.

[0019] Figure 3 It is another angle three-dimensional structure schematic diagram of the relay short circuit resistance structure of the utility model embodiment one.

[0020] Figure 4 is the first magnetism guide body of the embodiment one of the utility model and the perspective structural schematic diagram.

[0021] Figure 5 is the second magnetism guide body and the assembly structure schematic diagram of bridge movable contact of the embodiment one of the utility model.

[0022] Figure 6 is the cooperation structure schematic diagram of the first magnetism guide body and the second magnetism guide body of the embodiment one of the utility model.

[0023] Figure 7 is the overhead view of the relay of the embodiment one of the utility model.

[0024] Figure 8 is the A-A section view in Figure 7 .

[0025] Figure 9 is the front view of the second magnetism guide body of the embodiment one of the utility model.

[0026] Figure 10 is the cooperation structure schematic diagram of the first magnetism guide body and the second magnetism guide body of the embodiment two of the utility model.

[0027] Label explanation:

[0028] 1, the first magnetism guide body, 2, the second magnetism guide body, 3, the relay base, 4, bridge movable contact, 5, static spring component, 21, the bending extension, 31, magnetism guide body slot, 311, limiting rib. Specific implementation

[0029] The utility model will be further described below in conjunction with the drawings and embodiment.

[0030] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation on the utility model to the orientation or position of the indicated device or element must have a particular orientation, a particular orientation and operation, therefore cannot be understood as the limitation on the utility model.

[0031] Embodiment one

[0032] Please refer to the drawings Figure 1 to the drawings Figure 9The utility model discloses a kind of relay anti short-circuit structures, including the first magnetic conductor 1 installed on relay base 3 and the second magnetic conductor 2 installed on the moving spring component of relay, the first magnetic conductor 1 is oppositely arranged with the second magnetic conductor 2, when the moving contact of relay contact part and static contact close, the first magnetic conductor 1 and the second magnetic conductor 2 are configured to be close to each other and constitute magnetic circuit and reserve air gap between the first magnetic conductor 1 and the second magnetic conductor 2.It can be understood that, in the embodiment, by being oppositely arranged with the first magnetic conductor 1 and the second magnetic conductor 2 respectively on relay base 3 and the moving spring component of relay, when the moving contact of relay contact part and static contact close, the first magnetic conductor and the second magnetic conductor are close to each other and constitute magnetic circuit, when large current passes through the current-carrying component of relay, enough magnetic attraction that resists the electric repulsion between moving contact and static contact is generated between the first magnetic conductor and the second magnetic conductor, to make moving contact and static contact keep contact without being bounced apart by electric repulsion, effectively avoid the misoperation of moving contact, improve the performance of relay's short-circuit current resistance, and prevent the burning and explosion of relay under the action of strong electric arc.In addition, in the embodiment, why the first magnetic conductor 1 and the second magnetic conductor 2 are configured to reserve air gap when moving contact and static contact close is mainly to ensure that, after the silver layer of moving contact and static contact is consumed, the contact can still be reliably contacted, the reserved gap between the first magnetic conductor 1 and the second magnetic conductor 2 can be small, but cannot be without gap, otherwise, after a certain service life and the silver layer of contact is consumed, the defect that the first magnetic conductor 1 and the second magnetic conductor 2 are first contacted while moving contact and static contact are not contacted may be generated.

[0033] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 9 In a preferred embodiment, one of the first magnetic conductor 1 and the second magnetic conductor 2 is a flat plate structure, and the other is a U-shaped structure, and the opening end of the U-shaped magnetic conductor faces the flat plate magnetic conductor.In the embodiment, preferably, the first magnetic conductor 1 fixedly arranged on the relay base 3 is a flat plate structure, and the second magnetic conductor 2 fixedly arranged on the moving spring component of the relay is a U-shaped structure.The second magnetic conductor 2 is fixedly installed on the bridge-type moving contact 4 of the moving spring component.Further, the second magnetic conductor 2 is fixedly installed at the middle position of the bridge-type moving contact 4.

[0034] Please refer to the accompanying drawings Figure 1 In a preferred embodiment, the second magnetic conductor 2 and the bridge-type moving contact 4 are fixedly connected by riveting or resistance welding.However, those skilled in the art should understand that, in other embodiments, the second magnetic conductor 2 can also be fixed to the bridge-type moving contact 4 by other conventional fixing methods, such as buckle fixing, and is not limited to the specific implementation disclosed in the embodiment.

[0035] Please refer to the accompanying drawings Figure 1To the attached Figure 9 In one preferred embodiment, the air gap distance between the first magnetic conductor 1 and the second magnetic conductor 2 is configured such that when the current-carrying part of the relay passes through the short-circuit current, the magnetic field generated at the bridge moving contact 4 magnetizes the first magnetic conductor 1 and the second magnetic conductor 2, so as to generate a magnetic attraction force between the first magnetic conductor 1 and the second magnetic conductor 2 sufficient to resist the electric repulsion force between the moving contact and the stationary contact, and the direction of action of the magnetic attraction force is consistent with the direction of movement of the moving contact approaching the stationary contact to form a closure. In this embodiment, the air gap distance between the first magnetic conductor 1 and the second magnetic conductor 2 when the moving contact and the stationary contact of the relay contact part are closed is as small as possible, which can improve the electromagnetic attraction force between the two magnetic conductors, thereby improving the short-circuit current resistance performance of the relay.

[0036] Please refer to the attached Figure 1 To the attached Figure 9 In one embodiment of the utility model, the second magnetic conductor 2 of the U-shaped structure has a wider upper arm front end and a narrower lower arm front end. The upper arm is designed to be wider to ensure the size of the pole shoe area, and the lower arm is designed to be narrower to avoid the limiting ribs 311 on both sides of the magnetic conductor slot 31 of the relay base 3.

[0037] Embodiment two

[0038] Please refer to the attached Figure 10 The difference between this embodiment and embodiment one is that the second magnetic conductor 2 is provided with a bending extension part 21 corresponding to the first magnetic conductor 1 for increasing the pole shoe area between the first magnetic conductor 1 and the second magnetic conductor 2. In this embodiment, by increasing the pole shoe area between the two magnetic conductors, the electromagnetic attraction force between the two magnetic conductors can be effectively improved, thereby improving the short-circuit current resistance performance of the relay.

[0039] The above-described embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model, so all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.

Claims

1. A short-circuit resistant structure for a relay, characterized by: The relay anti-short circuit structure comprises a first magnetic conductor (1) fixed on a relay base (3) and a second magnetic conductor (2) fixed on a moving spring component of the relay, the first magnetic conductor (1) and the second magnetic conductor (2) are oppositely arranged, when a moving contact and a static contact of a relay contact part are closed, the first magnetic conductor (1) and the second magnetic conductor (2) are configured to be close to each other and form a magnetic conducting loop, and an air gap is reserved between the first magnetic conductor (1) and the second magnetic conductor (2).

2. The anti-short circuit structure of the relay according to claim 1, characterized in that: One of the first magnetic conductor (1) and the second magnetic conductor (2) is a flat plate structure, and the other is a U-shaped structure, and the opening end of the U-shaped structure faces the flat plate structure.

3. The anti-short circuit structure of the relay according to claim 2, characterized in that: The first magnetic conductor (1) fixed on the relay base (3) is a flat plate structure, and the second magnetic conductor (2) fixed on the moving spring component of the relay is a U-shaped structure.

4. The anti-short circuit structure of the relay according to claim 3, characterized in that: The second magnetic conductor (2) is fixedly installed on the bridge type moving contact (4) of the moving spring component.

5. The anti-short circuit structure of the relay according to claim 4, characterized in that: The second magnetic conductor (2) is fixedly installed at the middle position of the bridge type moving contact (4).

6. The anti-short circuit structure of the relay according to claim 4, characterized in that: The second magnetic conductor (2) and the bridge type moving contact (4) are fixedly connected by riveting or resistance welding.

7. The anti-short circuit structure of the relay according to claim 1, characterized in that: The air gap distance between the first magnetic conductor (1) and the second magnetic conductor (2) is configured to be: when the current-carrying component of the relay passes through a short circuit current, the magnetic field generated at the bridge type moving contact (4) magnetizes the first magnetic conductor (1) and the second magnetic conductor (2), so that a magnetic attraction force sufficient to resist the electric repulsion between the moving contact and the static contact is generated between the first magnetic conductor (1) and the second magnetic conductor (2).

8. The anti-short circuit structure of the relay according to claim 7, characterized in that: The direction of the magnetic attraction force is consistent with the direction of the movement of the moving contact close to the static contact to form a closure.

9. The short-circuit resistant relay structure according to any one of claims 1 to 8, characterized in that: The second magnetic conductor (2) is provided with a bending extension (21) corresponding to the first magnetic conductor (1) for increasing the pole shoe surface between the first magnetic conductor (1) and the second magnetic conductor (2).

10. A relay characterized by: The relay anti-short circuit structure comprises a relay base (3), a moving spring component arranged on the relay base (3), a static spring component (5), and the relay anti-short circuit structure according to any one of claims 1 to 9, wherein the relay base (3) is provided with a magnetic conductor slot (31), and the first magnetic conductor (1) of the relay anti-short circuit structure is fixedly inserted into the magnetic conductor slot (31).

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