CN109192622B

CN109192622B - Direct-acting relay with double-bridge structure

Info

Publication number: CN109192622B
Application number: CN201811108605.7A
Authority: CN
Inventors: 安吉鹏
Original assignee: Xiamen Hongfa Communication Electric Appliance Co ltd
Current assignee: Xiamen Hongfa Communication Electric Appliance Co ltd
Priority date: 2017-11-06
Filing date: 2018-09-21
Publication date: 2022-07-22
Anticipated expiration: 2038-09-21
Also published as: CN107731626A; CN109192622A

Abstract

The invention discloses a direct-acting relay with a double-bridge structure, which comprises a terminal component, a bridge component and a magnetic circuit component, wherein the terminal component is connected with the bridge component; the terminal assembly is positioned above the bridge assembly and is arranged opposite to the bridge assembly, and the lower part of the bridge assembly is movably sleeved in the magnetic circuit assembly and can move up and down; the bridge assembly comprises four movable contacts, an upper bridge, a lower bridge, a bridge rod and a bridge spring, wherein the four movable contacts are respectively riveted or welded on the upper bridge and the lower bridge, the middle parts of the upper bridge and the lower bridge are overlapped and then fixed at the top end of the bridge rod, the lower end of the bridge rod movably penetrates through the magnetic circuit assembly, and the bridge spring is sleeved at the lower part of the bridge rod. The bridge component is of a double-bridge direct-acting structure, so that the original voltages at the two ends of the contact are respectively divided into two gaps, the voltages at the two ends of the contact are reduced, the energy of electric arcs is reduced, the original currents at the two ends of the contact are respectively divided into two bridges, the currents flowing through the contact are reduced, the energy of the electric arcs is further reduced, the consumption of the contact is greatly reduced, and the service life of the relay is prolonged.

Description

Direct-acting relay with double-bridge structure

Technical Field

The invention relates to an electromagnetic relay, in particular to a direct-acting relay with a double-bridge structure.

Background

Since the power supply of an automobile generally uses 12VDC, the rated load voltage of a conventional relay is generally 12 VDC. As the automobile industry develops and more powerful automobile components are applied to automobiles, the 12V battery pack has gradually failed to meet the requirements of the powerful components. Since the 48V system has the advantages of carrying high power components and reducing the fuel consumption of the automobile, it has been gradually applied to the automobile instead of the original 12V system. With the application of 48V system, the rated load of the automobile relay is also increased from the original 12VDC to 48VDC, but the existing automobile relay does not switch the rated voltage and current.

The existing automobile relay is generally composed of a magnetic circuit system, a contact system and an auxiliary system. Fig. 1A is a schematic diagram of a typical automotive relay structure. A general direct acting type automobile relay includes a magnetic circuit assembly 1 ', a bridge assembly 2 ', and a terminal assembly 3 '. The magnetic circuit component 1 'comprises a coil component 11', a U-shaped yoke 12 ', a flat yoke 13', a movable iron core, a static iron core and a sleeve; the bridge assembly 2 'comprises a bridge 21', a movable contact 22 ', a bridge spring and a rod 23'; the terminal assembly 3 ' includes terminals 31 ', stationary contacts 32 '. The movable iron core is driven to drive the movable contact 22 to be in contact with and disconnected from the fixed contact 32 through the excitation of the coil, so that the on-off function of the relay is realized. When the contacts are in contact, as the load voltage increases from 12VDC to 48VDC and the load voltage increases to 200A, the existing automotive relays generate a lot of heat exceeding the thermal denaturation temperature of the cavity material, thereby destroying the relay. When the contacts are opened, an arc is generated, the larger the voltage is, the larger the current is, the stronger the energy of the arc is, and the conventional automobile relay cannot extinguish the arc generated by the 200A load after the contact is opened, namely the on-off function of the relay cannot be realized, and the combustion or explosion of the relay may be caused. Some relays are additionally provided with magnetic steel or a sealed cavity in order to improve arc extinguishing capacity, so that cost is greatly increased.

To solve the above problems, the present invention has been made in view of the above.

Disclosure of Invention

The invention aims to provide a direct-acting relay with a double-bridge structure, which is long in service life.

In order to achieve the purpose, the technical solution of the invention is as follows:

the invention relates to a direct-acting relay with a double-bridge structure, which comprises a terminal component, a bridge component and a magnetic circuit component; the terminal assembly is positioned above the bridge assembly and is arranged opposite to the bridge assembly, and the lower part of the bridge assembly is movably sleeved in the magnetic circuit assembly and can move up and down; the bridge assembly comprises four movable contacts, an upper bridge, a lower bridge, a bridge rod and a bridge spring, wherein the two movable contacts are riveted or welded on the upper bridge, the two movable contacts are riveted or welded on the lower bridge, the middle parts of the upper bridge and the lower bridge are overlapped and then fixed at the top end of the bridge rod, the lower end of the bridge rod movably penetrates through the magnetic circuit assembly, and the bridge spring is sleeved at the lower part of the bridge rod; the upper bridge and the lower bridge are connected in parallel on the loop to share the current of the loop, the four moving contacts are divided into two groups and respectively form independent gaps with the left and right pairs of fixed contacts on the terminal component, and the two groups of gaps are connected in series on the loop to share the voltage of the loop.

The middle part of the lower bridge is provided with a convex hull which protrudes upwards and is propped against the bottom surface of the middle part of the upper bridge.

After the scheme is adopted, the bridge assembly comprises four movable contacts, an upper bridge and a lower bridge, is of a double-bridge direct-acting structure, and is provided with the convex hulls, so that the bridge assembly has the following advantages:

1. double times of the original clearance can be generated under the condition of the same armature stroke;

2. the original voltages at the two ends of the contact are divided into two sections of gaps respectively, so that the voltages at the two ends of the contact are reduced, and the energy of electric arc is reduced;

3. original currents at two ends of the contact are respectively divided equally onto the two bridges, so that the current flowing through the contact is reduced, and the energy of an electric arc is further reduced;

4. under the condition of same breaking time, the speed of double times of the original contact breaking speed is generated

The four points are beneficial to extinguishing the electric arc, the consumption of the contact is greatly reduced, and the service life of the relay is prolonged. In addition, when the movable iron core drives the bridge assembly to move upwards, the pair of movable contacts on the upper bridge and the pair of movable contacts on the lower bridge are simultaneously contacted and pressed with the two pairs of static contacts on the terminal assembly, and the convex hull is arranged on the lower bridge, so that the upper bridge can swing left and right around the convex hull of the lower bridge, the imbalance of four groups of contacts caused by manufacturing and assembling errors can be adjusted, and the four groups of contacts can be contacted and pressed. At the moment, the current is divided into two paths, so that the power consumption when the contact is closed is reduced, and the closing temperature of the relay is reduced.

The invention is further described with reference to the following figures and specific examples.

Drawings

FIG. 1A is a schematic diagram of a conventional automotive relay;

FIG. 1 is an isometric view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is an exploded perspective view of the present invention;

FIG. 5 is an exploded perspective view of the bridge assembly of the present invention;

figure 6 is an isometric view of a lower axle in the bridge assembly of the present invention.

Detailed Description

As shown in fig. 1 to 4, the present invention is a direct acting relay of a double bridge structure, which includes a terminal assembly 1, a bridge assembly 2, and a magnetic circuit assembly 3.

The terminal assembly 1 is arranged above the bridge assembly 2 and opposite to the bridge assembly, and the lower part of the bridge assembly 2 is movably sleeved in the magnetic circuit assembly 3 and can move up and down.

The magnetic circuit component 3 comprises a static iron core 31, a coil component 32, a flat yoke 33, a U-shaped yoke 34 and a movable iron core 35. The movable iron core 35 is movably sleeved in the central hole of the static iron core 31.

As shown in fig. 4-6, the bridge assembly 2 includes four

movable contacts

21, 22, 23, 24, an upper bridge 25, a lower bridge 26, a bridge rod 27, and a bridge spring 28. The upper bridge 25 and the lower bridge 26 are Z-shaped, the upper bridge 25 and the lower bridge 26 are arranged in a staggered mode, and the upper bridge 25 and the lower bridge 26 are manufactured in a stamping mode. The two

movable contacts

21 and 22 are riveted or welded on the upper bridge 25, the two

movable contacts

23 and 24 are riveted or welded on the lower bridge 26, the middle parts of the upper bridge 25 and the lower bridge 26 are superposed and fixed on the top end of a bridge rod 27 through a snap ring 29, the lower end of the bridge rod 27 movably penetrates into the magnetic circuit component 3 and is propped against the top of a static iron core 31 in the magnetic circuit component 3 through a snap ring 210, and a bridge spring 28 is sleeved on the lower part of the bridge rod 27 and is positioned in the magnetic circuit component 3; the upper bridge 25 and the lower bridge 26 are connected in parallel on the loop to share the current of the loop, the four moving

contacts

21, 22, 23, 24 are divided into two groups and respectively form independent gaps with the left and right pairs of

fixed contacts

11, 12 on the terminal component 1, and the two groups of gaps are connected in series on the loop to share the voltage of the loop.

The middle part of the lower bridge 26 is provided with a convex hull 261 which protrudes upwards, the convex hull 261 abuts against the bottom surface of the middle part of the upper bridge 25, and the convex hull 261 ensures that the upper bridge 25 can swing left and right around the convex hull 261 of the lower bridge 26.

The working principle of the invention is as follows:

when the movable iron core 35 drives the bridge component 2 to move downwards, the pair of

movable contacts

21 and 22 on the upper bridge 25 and the pair of

movable contacts

23 and 24 on the lower bridge 26 are separated from the two pairs of fixed contacts on the terminal component 1 at the same time, two gaps are generated at the same time, and four electric arcs break the circuit. Because the number of the electric arcs is changed from two to four, the energy of a single electric arc is reduced, the electric arc can be rapidly extinguished, and the arc extinguishing capability of the relay is improved.

The invention focuses on: the movable contact consists of four movable contacts which are riveted or welded on the two bridges, and the Z-shaped design of the upper bridge and the lower bridge meets the small-size assembly requirement.

The above description is only a preferred embodiment of the present invention, and there are many structural forms of the upper bridge and the lower bridge, so that the scope of the present invention should not be limited by these, and the equivalent changes and modifications made according to the claims and the content of the description of the present invention should still fall within the scope covered by the present invention.

Claims

1. A direct-acting relay with a double-bridge structure comprises a terminal component, a bridge component and a magnetic circuit component; the terminal assembly is positioned above the bridge assembly and is arranged opposite to the bridge assembly, and the lower part of the bridge assembly is movably sleeved in the magnetic circuit assembly and can move up and down; the method is characterized in that: the bridge assembly comprises four movable contacts, an upper bridge, a lower bridge, a bridge rod and a bridge spring, wherein two movable contacts are arranged on the upper bridge, two movable contacts are arranged on the lower bridge, the middle parts of the upper bridge and the lower bridge are overlapped and then fixed at the top end of the bridge rod, the lower end of the bridge rod movably penetrates through the magnetic circuit assembly, and the bridge spring is sleeved at the lower part of the bridge rod; the upper bridge and the lower bridge are connected in parallel on the loop to share the current of the loop, the four moving contacts are divided into two groups and respectively form independent gaps with the left and right pairs of fixed contacts on the terminal component, the two groups of gaps are connected in series on the loop to share the voltage of the loop;

the middle part of the lower bridge is provided with a convex hull which protrudes upwards, the convex hull abuts against the bottom surface of the middle part of the upper bridge, and the bridge rod penetrates through the convex hull.

2. The direct acting relay of the double bridge structure according to claim 1, characterized in that: the upper bridge and the lower bridge are both Z-shaped and are arranged in a staggered manner.

3. The direct acting relay of the double bridge structure according to claim 1, characterized in that: the two moving contacts are riveted or welded on the upper bridge, and the two moving contacts are riveted or welded on the lower bridge.

4. The direct acting relay of the double bridge structure according to claim 1, characterized in that: the upper bridge and the lower bridge are manufactured in a stamping mode.