CN218887077U

CN218887077U - Direct current relay with explosion-proof structure

Info

Publication number: CN218887077U
Application number: CN202223266621.3U
Authority: CN
Inventors: 李滔; 吴启胜; 黄安治; 邓超艳; 李浩嶂; 司勇; 张梦龙
Original assignee: Weisheng Energy Technology Co ltd
Current assignee: Weisheng Energy Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-04-18
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses a direct current relay with an explosion-proof structure, which comprises a bottom shell, wherein a static iron core is fixed at the upper part in the bottom shell, a movable iron core is slidably arranged at the lower part in the bottom shell, and a first elastic element is arranged between the static iron core and the movable iron core; the bottom shell body top is fixed with yoke iron plate, yoke iron plate top is fixed with the insulating boot, install on the insulating boot with the moving plate complex lead out the end, move iron core fixedly connected with push rod assembly, push rod assembly upper portion passes quiet iron core and is connected with U type support, push rod assembly's top is connected with the moving plate through the second elastic component, the moving plate is in U type support inboard. The utility model discloses fix yoke iron on U type support upper end, fixed U type armature on the rotor. When the contacts are closed, the current on the moving plate can induce a magnetic field, the magnetic field is increased along with the magnitude of the current, and the magnetized upper yoke iron and the U-shaped armature iron can generate attraction force with each other, so that electric repulsion force between a part of the contacts is counteracted, and effective explosion prevention is realized.

Description

Direct current relay with explosion-proof structure

Technical Field

The utility model relates to a high voltage direct current relay technical field especially relates to a take explosion-proof structure's direct current relay.

Background

The relay is an electronic control device, it has a control system (also called input circuit) and a controlled system (also called output circuit), and is usually applied in automatic control circuit, it generally uses a small current to control an automatic switch of a large current, and plays the role of automatic regulation, safety protection, switching circuit, etc. in the circuit.

When the relay is closed, along with the increase of current, especially when great fault current occurs in a circuit, electric repulsion force is generated between the leading-out end and the moving piece contact point due to the influence of the current between the leading-out end and the moving piece contact point. The magnitude of this repulsive force is proportional to the square of the current.

Where P is the electrodynamic repulsion, I is the current through the contact, D is the contact outer diameter, and a is the radius of the actual contact surface.

When the electric repulsive force is larger than the final pressure applied to the contacts by the pressure spring, the contacts are caused to spring open, and an arc is generated. The arc energy is very large at this time, and the contact can be burnt out, so that the relay is exploded.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a take explosion-proof structure's direct current relay.

The purpose of the utility model is realized through the following technical scheme:

a direct current relay with an explosion-proof structure comprises a bottom shell, wherein a static iron core is fixed at the upper part in the bottom shell, a movable iron core is slidably arranged at the lower part in the bottom shell, and a first elastic element is arranged between the static iron core and the movable iron core; a yoke iron plate is fixed at the top of the bottom shell, an insulating cover is fixed above the yoke iron plate, a leading-out end matched with the moving piece is installed on the insulating cover, the moving iron core is fixedly connected with a push rod assembly, the upper part of the push rod assembly penetrates through the static iron core and is connected with a U-shaped support, the top of the push rod assembly is connected with the moving piece through a second elastic piece, and the moving piece is located on the inner side of the U-shaped support and below the top of the U-shaped support; the top of U type support is connected with first magnetization structure, the rotor is connected with second magnetization structure.

In a further improvement, the first magnetizing structure is an upper yoke, and the second magnetizing structure is a U-shaped armature.

In a further improvement, the first elastic member is a return spring.

In a further improvement, the second elastic member is a pressure spring.

In a further improvement, the U-shaped armature is riveted at the bottom of the moving plate through a rivet.

In a further improvement, the insulating cover is a ceramic cover.

The utility model has the advantages that:

the utility model discloses fix yoke iron on U type support upper end, fixed U type armature on the rotor. When the contacts are closed, a current on the rotor may induce a magnetic field. This magnetic field increases with the magnitude of the current. And the induced magnetic field may magnetize the soft magnetic material until the magnetic material is saturated. When the magnetized upper yoke iron and the U-shaped armature iron mutually generate attraction force. Thereby canceling out the electric repulsive force between a part of the contacts. When the mutual attraction force and the pressure of the pressure spring can be larger than the electric repulsion force between the contacts, the contacts cannot be bounced to generate arcing, and thus the explosion-proof effect can be achieved.

Drawings

The present invention is further explained by using the attached drawings, but the content in the attached drawings does not constitute any limitation to the present invention.

Fig. 1 is a schematic sectional structure of the present invention.

The device comprises a base shell, a leading-out end 1, a leading-out end 2, a moving piece 3, an upper yoke 4, a U-shaped armature 5, a static iron core 6, a moving iron core 7, a push rod assembly 8, a return spring 9, a rivet 10, a pressure spring 11, a yoke plate 12, a ceramic cover 13, a U-shaped support 14 and a bottom shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1, the direct current relay with the explosion-proof structure includes a bottom housing 14, a stationary core 2 is fixed at an upper portion in the bottom housing 14, a movable core 6 is slidably mounted at a lower portion in the bottom housing 14, and a return spring 8 is mounted between the stationary core 2 and the movable core 6; a yoke plate 11 is fixed at the top of the bottom shell 14, a ceramic cover 12 is fixed above the yoke plate 11, a leading-out end 1 matched with the moving piece 2 is installed on the ceramic cover 12, a push rod assembly 7 is fixedly connected with the moving iron core 6, the upper part of the push rod assembly 7 penetrates through the static iron core 2 and is connected with a U-shaped support 13, the top of the push rod assembly 7 is connected with the moving piece 2 through a pressure spring 10, and the moving piece 2 is positioned on the inner side of the U-shaped support 13 and below the top of the U-shaped support 13; the top of the U-shaped bracket 13 is connected with an upper yoke 3, and the moving plate 2 is connected with a U-shaped armature 4.

The working principle of the utility model is as follows:

during normal operation, the movable iron core 6 is under the action of electromagnetic force induced by the additional coils (respectively wound outside the movable iron core 6, outside the U-shaped armature and outside the U-shaped armature 4). And the movable iron core 6 drives the push rod assembly 7 to move upwards, and the push rod assembly 7 drives the movable piece 2 at the top to move upwards, so that the two leading-out ends 1 are mutually communicated, the pressure spring 10 can be compressed, and the relay is in a closed state at the moment. As the pressure spring 10 is compressed, overtravel is generated, and certain contact pressure exists between the leading-out end 1 and the movable piece 2. After the coil loses power, the mutual attraction between the movable iron core 6 and the static iron core 5 disappears, the movable iron core 6 drives the push rod assembly 7 and the movable piece 2 to move downwards under the action of the compressed return spring 8, the movable piece 2 is separated from the leading-out ends 1, and therefore the two leading-out ends 1 are disconnected, and the relay is in a disconnected state at the moment.

When the moving plate 6 and the leading-out terminal 1 are closed, and then when the circuit has fault current, the magnetic field induced by the current can magnetize the upper yoke 3 riveted on the U-shaped bracket 13 and the U-shaped armature 4 riveted on the moving plate 2 through the rivet 9, and the two attract each other. The generated attraction force and the resultant force of the pressure spring 10 counteract the electromagnetic repulsion between the movable piece 2 and the leading-out terminal 1. When the contact is normally closed, the movable sheet 2 and the leading-out terminal 1 are not allowed to be bounced open, thereby playing an explosion-proof role.

It should be finally noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A direct current relay with an explosion-proof structure comprises a bottom shell (14), wherein a static iron core (5) is fixed at the upper part in the bottom shell (14), a movable iron core (6) is slidably mounted at the lower part in the bottom shell (14), and a first elastic piece is mounted between the static iron core (5) and the movable iron core (6); a yoke iron plate (11) is fixed at the top of the bottom shell (14), an insulating cover is fixed above the yoke iron plate (11), a leading-out end (1) matched with the moving plate (2) is installed on the insulating cover, and the moving iron core (6) is fixedly connected with a push rod assembly (7), and the push rod assembly is characterized in that the upper part of the push rod assembly (7) penetrates through the static iron core (5) and is connected with a U-shaped support (13), the top of the push rod assembly (7) is connected with the moving plate (2) through a second elastic piece, and the moving plate (2) is located on the inner side of the U-shaped support (13) and below the top of the U-shaped support (13); the top of U type support (13) is connected with first magnetization structure, rotor (2) are connected with the second magnetization structure.

2. The direct current relay with the explosion-proof structure as claimed in claim 1, wherein the first magnetizing structure is an upper yoke (3) and the second magnetizing structure is a U-shaped armature (4).

3. The direct current relay with the explosion-proof structure as claimed in claim 1, wherein the first elastic member is a return spring (8).

4. The direct current relay with explosion-proof structure as claimed in claim 1, wherein the second elastic member is a compression spring (10).

5. The direct current relay with the explosion-proof structure as claimed in claim 2, wherein the U-shaped armature (4) is riveted at the bottom of the moving plate (2) by a rivet (9).

6. The direct current relay with explosion-proof structure as recited in claim 1, wherein said insulating cover is a ceramic cover (12).