CN217690986U

CN217690986U - Anti-adhesion connecting structure of direct current relay

Info

Publication number: CN217690986U
Application number: CN202221463690.0U
Authority: CN
Inventors: 陈朋
Original assignee: Shanghai Weipeng Technology Co ltd
Current assignee: Shanghai Weipeng Technology Co ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-10-28
Anticipated expiration: 2032-06-13

Abstract

The utility model relates to a relay especially relates to a direct current relay. An anti-sticking structure of a direct current relay, the direct current relay comprising: the arc extinguishing cover assembly comprises a fixed contact and an arc extinguishing cover, a movement mechanism is arranged below the arc extinguishing cover assembly, the movement mechanism comprises a movable contact plate and a push rod part, and the anti-adhesion connection mechanism comprises an upper magnetizer, a lower magnetizer and a group of magnetic steel; the upper magnetizer is positioned above the arc-extinguishing cover and between the two fixed contacts, and the lower magnetizer is positioned below the movable contact plate and forms a magnetic conductive loop surrounding the outside of the movable contact plate together with the upper magnetizer; the magnetic field direction of the group of magnetic steels is parallel to the current direction flowing through the movable touch plate. The utility model discloses increase the pressure between moving contact and the static contact under the heavy current condition to offset because of the produced electronic repulsion of heavy current, make moving contact and static contact reduction direct current relay more reliably and take place the probability that the contact is even.

Description

Anti-adhesion connecting structure of direct current relay

Technical Field

The utility model relates to a relay especially relates to a direct current relay.

Background

In recent years, industries related to new energy resources are rapidly developed, wherein automobiles and engineering vehicles are converted into electric vehicles, application of power batteries is more common, in a direct current electrical system formed by taking the power batteries as a power supply, a direct current relay is an essential element for controlling on-off of a circuit, and an electromagnetic system formed by a coil and an iron core is used as a control and execution component for driving a mechanism in the relay to move so as to enable a movable contact and a fixed contact to be switched on or off to realize a switching function.

Under the condition of load, an electric arc is generated at the moment of contact or disconnection between a moving contact and a fixed contact of the direct current relay, the intensity of the electric arc is higher when the load current is higher, the moving contact and the fixed contact are adhered together when partial contact materials are converted into a molten state under the ablation of the electric arc, and the direct current relay cannot normally break a circuit. In a high-voltage direct-current electrical system (such as an electrical system of a new energy automobile), a short-time large current far larger than a rated load current is generated when a power battery supplies power, electric repulsion between a moving contact and a fixed contact is remarkably increased under the action of the large current, the moving contact and the fixed contact are easily repelled by the electric repulsion to generate an electric arc, or the moving contact and the fixed contact are not repelled but contact resistance is increased and temperature rise is increased, so that a fault phenomenon that the contacts of a direct-current relay are adhered is easily caused.

Disclosure of Invention

The utility model aims at solving the above-mentioned defect of prior art, provide a direct current relay's anti glutinous structure that links. The utility model discloses increase the pressure between moving contact and the static contact under the heavy current condition to offset because of the produced electronic repulsion of heavy current, make moving contact and static contact reduction direct current relay more reliably and take place the probability that the contact is glutinous.

The utility model relates to a realize like this, a direct current relay's anti-adhesion structure, direct current relay contains: the arc extinguishing cover assembly comprises a fixed contact and an arc extinguishing cover, a movement mechanism is arranged below the arc extinguishing cover assembly, the movement mechanism comprises a movable contact plate and a push rod part, and the anti-adhesion connection mechanism comprises an upper magnetizer, a lower magnetizer and a group of magnetic steel; the upper magnetizer is positioned above the arc-extinguishing cover and between the two fixed contacts, and the lower magnetizer is positioned below the movable contact plate and forms a magnetic conductive loop surrounding the outside of the movable contact plate together with the upper magnetizer; the magnetic field direction of a group of magnetic steels is parallel to the current direction flowing through the movable contact plate.

In the anti-adhesion connection structure of the direct current relay, one part of the fixed contact is positioned on the arc-extinguishing chamber, and the other part of the fixed contact penetrates through the arc-extinguishing chamber and extends into the arc-extinguishing chamber.

The lower magnetizer is in a U-shaped structure and is in mutual contact with the movable contact plate.

The direct current relay anti-adhesion structure comprises a push rod, a contact spring, an iron core spring, a movable iron core, a shaft and a clamp spring, wherein the shaft sequentially penetrates through the push rod, the contact spring, the iron core spring and the movable iron core, and the clamp spring and two ends of the shaft are clamped to limit the push rod and the movable iron core.

According to the anti-adhesion structure of the direct current relay, the movable contact plate of the moving mechanism and the two ends of the lower magnetizer are respectively contacted with the push rod and the contact spring so as to move together with the push rod component.

According to the anti-adhesion structure of the direct current relay, the movable contact plate, the lower magnetizer and the push rod part move up and down to enable the movable contact plate and the static contact to be contacted or separated from each other.

The anti-adhesion structure of the direct current relay is characterized in that the upper magnetizer is of a U-shaped structure, and an opening of the U-shaped structure faces the lower magnetizer.

The upper magnetizer or the lower magnetizer of the utility model can be designed into a U-shaped structure according to the requirement, and form a magnetic conductive loop around the movable contact plate; when the circuit is conducted, a magnetic field is generated around the movable contact plate, the lower magnetizer and the upper magnetizer are attracted under the action of the magnetic field force, the larger the current is, the larger the magnetic field force is, the larger the attraction force between the lower magnetizer and the upper magnetizer is, the generated electromagnetic force is beneficial to offsetting the electric repulsion force between the static contact and the movable contact plate generated by large current, so that the static contact and the movable contact plate are kept in close contact to prevent mutual repulsion or contact resistance is suddenly increased, and the risk of circuit failure caused by contact adhesion is reduced.

Drawings

FIG. 1 is a schematic front view of the cross-section of the present invention;

FIG. 2 is a schematic side view of the present invention;

figure 3 is an exploded view of the arc chute assembly of the present invention;

FIG. 4 is a schematic view of the movement mechanism of the present invention;

FIG. 5 is a schematic diagram of the electric repulsion compensation structure of the present invention;

fig. 6 is an exploded view of the motion mechanism of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

The utility model is realized as follows, as shown in figures 1-6: an anti-adhesion structure of a direct current relay is disclosed, wherein an arc extinguishing cover assembly comprises a static contact 1, an arc extinguishing cover 2, a movement mechanism consisting of a movable contact plate 5 and a push rod part 7 and a group of magnetic steels 3; one part of the static contact 1 is positioned above the arc-extinguishing chamber 2, the other part of the static contact passes through the hole 22 of the arc-extinguishing chamber 2, and an upper magnetizer 4 is arranged above the arc-extinguishing chamber 2 and between the two static contacts 1; the moving contact plate 5 in the moving mechanism can be contacted with or separated from the static contact 1, and the lower magnetizer 6 is contacted with the moving contact plate 5 and forms a magnetic conductive loop surrounding the outside of the moving contact plate 5 with the upper magnetizer 4;

the push rod component 7 comprises a push rod 71, a contact spring 72, a core spring 73, a movable core 74, a shaft 75 and a clamp spring 76, wherein the shaft 75 sequentially penetrates through the push rod 71, the contact spring 72, the core spring 73 and the movable core 74, and the clamp spring 76 and two ends of the shaft 75 are clamped to limit the push rod 71 and the movable core 74. The two ends of the movable contact plate 5 and the lower magnetizer 6 are respectively contacted with the push rod 71 and the contact spring 72 and form a moving mechanism with the push rod part 7, and the movable contact plate 5 and the lower magnetizer 6 can move synchronously with the push rod part 7.

A group of magnetic steels 3 are arranged on the outer side of the side wall 21 of the arc extinguishing chamber 2, and the magnetic field direction of the group of magnetic steels 3 is parallel to the connecting line direction of the two fixed contacts 1.

The moving mechanism composed of the movable contact plate 5, the lower magnetizer 6 and the push rod part 7 can reciprocate relative to the static contact 1.

When the moving iron core 74 overcomes the counterforce of the iron core spring 73 to move towards the direction of the static contact 1 under the action of external force (such as electromagnetic force), the push rod part 7 drives the moving contact plate 5 and the lower magnetizer 6 to move synchronously, when the moving contact plate 5 moves to be contacted with the static contact 1, the static contact 1 starts to receive the counterforce of the contact spring 72, when the moving iron core 74 continues to move until the maximum displacement (namely the contact spring reaches the maximum compression amount in the push rod part), the push rod part 7 stops moving, the static contact 1 and the moving contact plate 5 are in close contact under the action of the contact spring 72, and at the moment, the two static contacts 1 and the moving contact plate 5 form a conductive loop;

when the external force of the moving iron core 74 weakens or disappears, under the action of the contact spring 72 and the iron core spring 73, the moving mechanism moves towards the direction away from the static contact 1, the moving contact plate 5 is separated from the static contact 1, and the circuit between the two static contacts 1 is disconnected; because the two static contacts 1 are conducted by direct current with high voltage and large current, electric arcs can be generated at the moment of contact and separation of the static contacts 1 and the movable contact plate 5, and the magnetic field formed by the magnetic steel 3 can quickly blow out the electric arcs so as to quickly extinguish the electric arcs;

when the circuit is conducted, an electric repulsion force is generated between the static contact 1 and the movable contact plate 5, the action direction of the electric repulsion force is to repel the static contact 1 and the movable contact plate 5 away from each other, the larger the current in the circuit is, the larger the electric repulsion force is, if a short-circuit current is generated in the circuit, the electric repulsion force is possibly larger than the pressure between the static contact 1 and the movable contact plate 5 (namely the acting force of the contact spring 72), the static contact 1 and the movable contact plate 5 repel each other and generate an electric arc, the static contact 1 and the movable contact plate 5 are easily adhered to each other when the contact material is in a molten state under the ablation of the electric arc, and even if the static contact 1 and the movable contact plate 5 are not repelled from each other, the high-temperature adhesion phenomenon can also be caused when the contact resistance is remarkably increased. The lower magnetizer 6 is positioned below the movable contact plate 5, the upper magnetizer 4 is positioned above the movable contact plate 5, the upper magnetizer or the lower magnetizer can be designed into a U-shaped structure according to requirements, a magnetic conductive loop is formed around the movable contact plate 5, and the upper magnetizer 4 cannot move towards the lower magnetizer 6 through the limit of the arc extinguishing cover 2; when the circuit is conducted, a magnetic field is generated around the movable contact plate 5, the lower magnetizer 6 and the upper magnetizer 4 are attracted under the action of the magnetic field force, the larger the current is, the larger the magnetic field force is, the larger the attraction force between the lower magnetizer and the upper magnetizer is, and the attraction force is favorable for offsetting the electric repulsion force between the static contact 1 and the movable contact plate 5 generated by the large current, so that the static contact 1 and the movable contact plate 5 are kept in close contact, and the risk of circuit failure caused by the adhesion of the contacts is reduced.

Claims

1. An anti-sticking structure of a direct current relay, the direct current relay comprising: the arc extinguishing shield assembly comprises a fixed contact and an arc extinguishing shield, a movement mechanism is arranged below the arc extinguishing shield assembly, the movement mechanism comprises a movable contact plate and a push rod part, and the arc extinguishing shield assembly is characterized in that the anti-adhesion connection mechanism comprises an upper magnetizer, a lower magnetizer and a group of magnetic steels; the upper magnetizer is positioned above the arc extinguishing cover and between the two fixed contacts, and the lower magnetizer is positioned below the movable contact plate and forms a magnetic conductive loop around the outer part of the movable contact plate together with the upper magnetizer; the magnetic field direction of a group of magnetic steels is parallel to the current direction flowing through the movable contact plate.

2. The anti-sticking structure of a dc relay according to claim 1, wherein a portion of the stationary contact is located above the arc-extinguishing chamber, and another portion passes through the arc-extinguishing chamber and penetrates into the arc-extinguishing chamber.

3. The anti-adhesion structure of a direct current relay according to claim 1, wherein the lower magnetic conductor has a "U" shape and is in contact with the movable contact plate.

4. The anti-adhesion structure of the direct current relay according to claim 1, wherein the push rod component comprises a push rod, a contact spring, an iron core spring, a movable iron core, a shaft and a clamp spring, the shaft sequentially penetrates through the push rod, the contact spring, the iron core spring and the movable iron core, and the clamp spring is clamped with two ends of the shaft to limit the push rod and the movable iron core.

5. The anti-adhesion structure of the direct current relay according to claim 1, wherein the moving contact plate and the lower magnetic conductor of the moving mechanism are respectively in contact with the push rod and the contact spring at the two ends thereof, so as to move together with the push rod member.

6. The anti-adhesion structure of the direct current relay according to claim 1, wherein the movable contact plate, the lower magnetic conductor and the push rod member move up and down to contact or separate the movable contact plate and the fixed contact.

7. The anti-adhesion structure of a dc relay according to claim 1, wherein the upper magnetic conductor is a "U" shaped structure, and the opening of the "U" shaped structure faces the lower magnetic conductor.