CN214378242U

CN214378242U - Direct-current relay capable of improving short-circuit resistance

Info

Publication number: CN214378242U
Application number: CN202120403837.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuhan Tongli Tongwei Technology Co ltd
Current assignee: Wuhan Tongli Tongwei Technology Co ltd
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-10-08
Anticipated expiration: 2031-02-23

Abstract

The utility model discloses a promote direct current relay of anti short circuit ability, it includes mount, first yoke, holder, movable contact bridge, second yoke, locating part, elastic component and yoke iron plate, wherein: the mount includes first conflict portion and first deformation portion, and two first deformation portion an organic whole are connected in the double-phase offsides of first conflict portion, and movable contact bridge, second yoke and elastic component all set up in the second installing port, and first yoke, second yoke body and two magnetic conduction parts do not at least partially encircle in movable contact bridge week side, and the elastic component provides elasticity with movable contact bridge butt in locating part. The utility model discloses in, owing to used the mount to fix first yoke, first yoke receives the suction of second yoke can not direct action in the movable contact bridge, consequently under the condition of the increase of suction between short-circuit current is very big, first yoke and the second yoke, the movable contact bridge also can not pushed away the stationary contact, further promotes the anti short circuit ability of relay.

Description

Direct-current relay capable of improving short-circuit resistance

Technical Field

The utility model relates to a relay technical field, specificly relate to a promote direct current relay of anti short circuit ability.

Background

The direct current relay can be used in an energy storage system such as an electric vehicle battery pack, and the short circuit resistance of the direct current relay is an important index, and the index is also important for the energy storage system. However, when the energy storage system is short-circuited, the short-circuit current can generate an electric repulsion force in a contact bridge contact area of the direct current relay, and the traditional direct current relay is difficult to overcome the electric repulsion force, so that the contact bridge is repelled, and the direct current relay is caused to be arc-discharged and even explode. In order to improve the short-circuit resistance of the dc relay, a common practice at present is to arrange a yoke made of a magnetic material around a moving contact bridge of the dc relay, and make an attractive force between the yokes arranged around the moving contact bridge counteract an electric repulsive force generated in a contact area of the moving contact bridge through a magnetic field generated by a short-circuit current of an energy storage system, so as to ensure that the moving contact bridge is not repelled, for example, chinese patent CN 201180035052.7 discloses an arrangement manner of the yoke, and through this manner, the short-circuit resistance of the dc relay can be greatly improved.

However, as the potential short-circuit current of the energy storage system increases gradually, for example, the battery capacity of the electric vehicle increases more and more, and accordingly, the requirement for the short-circuit resistance of the dc relay applied to such energy storage system also increases more and more, in the structure disclosed in the above-mentioned patent, under the condition of higher short-circuit current, because one yoke part is connected with the driving unit, the attraction force between the yokes generated along with high short-circuit current can push the driving unit away even, so that the gap between the yoke part and the moving contact bridge decreases until the yoke part contacts with the moving contact bridge and pushes the moving contact bridge, and the moving contact bridge is disconnected from the stationary contact, thereby causing the arc discharge of the dc relay and possibly causing explosion.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned technique not enough, provide a promote direct current relay of anti short circuit ability for solve among the prior art can't be applicable to very big short-circuit current circuit's problem to partial relay.

In order to achieve the technical purpose, the technical proposal of the utility model is as follows: the utility model provides a promote direct current relay of anti short circuit ability, its includes mount, first yoke, holder, movable contact bridge, second yoke, locating part, elastic component and yoke iron plate, wherein: the fixing frame comprises a first collision part and first deformation parts, the two first deformation parts are integrally connected to two opposite sides of the first collision part, the fixing frame is fixed on one side of the yoke plate, two ends of the first yoke are respectively connected with the two first deformation parts, the first yoke and the fixing frame surround to form a first mounting opening, and the retainer and the limiting part are arranged in the first mounting opening; the retainer comprises a second collision part and a second deformation part, the two second deformation parts are integrally connected to two opposite sides of the second collision part, two ends of the limiting part are respectively connected with the two second deformation parts, and the limiting part and the retainer surround to form a second mounting opening; the movable contact bridge, the second yoke and the elastic piece are arranged in the second installation opening, the second yoke is arranged between the elastic piece and the movable contact bridge, the second yoke comprises a second yoke body and two magnetic conduction parts bent towards the movable contact bridge along two sides of the second yoke body, the first yoke, the second yoke body and the two magnetic conduction parts at least partially surround the periphery of the movable contact bridge respectively, and the elastic piece provides elastic force to enable the movable contact bridge to abut against the limiting piece.

Preferably, the first yoke includes first yoke body and two first bosss that extend respectively along two opposite sides of first yoke body, and first mating holes is seted up to first deformation portion, and first boss and first mating holes cooperation are connected.

Preferably, the first deformation portion further has a tongue extending toward the first fitting hole, the tongue is located on one side of the first fitting hole away from the first abutting portion, and the tongue is bent and abuts against the first yoke to fix the first yoke.

Preferably, promote anti short circuit capability's direct current relay still includes the buckle, and the bayonet socket is seted up to first deformation portion, and the buckle includes third conflict portion and an organic whole and connects in the card foot at third conflict portion both ends, card foot and bayonet coupling, and third conflict portion supports to press in first yoke to fixed first yoke.

Preferably, the first yoke body is connected with the first deformation part in a welding manner.

Preferably, the two sides of the second deformation part are provided with notches, two opposite sides of the limiting part respectively extend out of two bending parts, the bending parts are matched with the notches and are bent towards the second deformation part so as to fix the limiting part and the second deformation part, and the first yoke and the second yoke surround the moving contact bridge to form a magnetic conduction loop.

Preferably, the two opposite sides of the limiting member are formed with second bosses, the second deformation portion is provided with a second matching hole, the second bosses are matched with the second matching hole, the second deformation portion is welded with the limiting member, and the first yoke, the limiting member and the second yoke surround the moving bridge to form a magnetic conduction loop.

Preferably, this promote direct current relay of anti short circuit ability still includes fixing base and actuating lever, fixing base and second conflict portion fixed connection, the one end fixed connection that the holder was kept away from to actuating lever and fixing base for the drive holder removes.

Compared with the prior art, the beneficial effects of the utility model include: when a large short-circuit current is connected into the movable contact bridge, a magnetic field is generated around the movable contact bridge, so that the first yoke and the second yoke are mutually attracted, the movable contact bridge is prevented from being separated from the fixed contact, the first yoke is fixed by using the fixing frame, the first yoke cannot be directly acted on the movable contact bridge by the attraction of the second yoke, and therefore the movable contact bridge cannot be pushed away from the fixed contact under the condition that the short-circuit current is large and the attraction between the first yoke and the second yoke is increased, and the short-circuit resistance of the relay is further improved.

Drawings

Fig. 1 is an exploded view of an embodiment 1 of a dc relay according to the present invention for improving short-circuit resistance;

fig. 2 is a perspective view of embodiment 1 of the dc relay for improving short-circuit resistance provided by the present invention;

fig. 3 is a perspective view of embodiment 2 of the dc relay for improving short-circuit resistance provided by the present invention;

fig. 4 is a perspective view of embodiment 3 of the dc relay for improving short-circuit resistance provided by the present invention;

fig. 5 is an exploded view of embodiment 4 of the dc relay of the present invention for improving short circuit resistance;

fig. 6 is a perspective view of embodiment 4 of the dc relay for improving short-circuit resistance provided by the present invention;

fig. 7 is a perspective view of an embodiment 5 of the dc relay for improving short-circuit resistance provided by the present invention;

fig. 8 is a perspective view of embodiment 6 of the dc relay for improving short-circuit resistance provided by the present invention;

reference numerals: 1-fixed frame, 2-first yoke, 3-retainer, 4-movable contact bridge, 5-second yoke, 6-limit piece, 7-elastic piece, 8-buckle, 9-fixed seat, a 1-driving rod, a 2-yoke iron plate, a 3-iron core, 11-first interference part, 12-first deformation part, 1 a-first mounting opening, 2 a-second mounting opening, 21-first yoke body, 22-first lug boss, 31-second interference part, 32-second deformation part, 51-second yoke body, 52-magnetic conduction part, 61-bending part, 62-second lug boss, 81-third interference part, 82-clamping foot, 121-first matching hole, 122-clamping tongue, 123-clamping opening, 321-notch, 322-second mating hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

referring to fig. 1 and 2, the present embodiment provides a dc relay with improved short-circuit resistance, which includes a fixed frame 1, a first yoke 2, a holder 3, a movable contact bridge 4, a second yoke 5, a limiting member 6, an elastic member 7, and a yoke plate a2, wherein:

the fixing frame 1 comprises a first abutting part 11 and a first deformation part 12, the two first deformation parts 12 are integrally connected to two opposite sides of the first abutting part 11, two ends of the first yoke 2 are respectively connected with the two first deformation parts 12, the first yoke 2 and the fixing frame 1 surround to form a first mounting opening 1a, and the retainer 3 and the limiting part 6 are arranged in the first mounting opening 1 a. Specifically, the first yoke 2 includes a first yoke body 21 and two first bosses 22 respectively extending along two opposite sides of the first yoke body 21, the first deformation portion 12 is provided with a first fitting hole 121, and the first bosses 22 are connected to the first fitting hole 121 in a fitting manner. In this embodiment, the first deformation portion 12 further has a latch 122 extending toward the first fitting hole 121, the latch 122 is located on a side of the first fitting hole 121 away from the first abutting portion 11, and the latch 122 bends and abuts against the first yoke 2 to fix the first yoke 2.

The retainer 3 includes second conflict portion 31 and second deformation portion 32, and two second deformation portions 32 are integrative to be connected in the two opposite sides of second conflict portion 31, and locating part 6 both ends are connected with two second deformation portions 32 respectively, and locating part 6 and retainer 3 surround and form second installing port 2 a. In this embodiment, the two sides of the second deformation portion 32 are provided with notches 321, two opposite sides of the limiting member 6 respectively extend to form two bending portions 61, the bending portions 61 are matched with the notches 321, and the bending portions 61 are bent toward the second deformation portion 32 to fix the limiting member 6 and the second deformation portion 32. The limiting piece 6 is used for limiting the movable contact bridge 4 and preventing the movable contact bridge 4 from being separated from the second mounting port 2 a.

The movable contact bridge 4, the second yoke 5 and the elastic element 7 are all arranged in the second mounting opening 2a, the second yoke 5 is arranged between the elastic element 7 and the movable contact bridge 4, the second yoke 5 comprises a second yoke body 51 and two magnetic conductive parts 52 bent towards the movable contact bridge 4 along two sides of the second yoke body 51, the first yoke 2, the second yoke body 51 and the two magnetic conductive parts 52 respectively at least partially surround the periphery of the movable contact bridge 4, in the embodiment, four side surfaces of the movable contact bridge 4 respectively correspond to the first yoke 2, the second yoke body 51 and the two magnetic conductive parts 52 one by one, and the elastic element 7 provides elastic force for the movable contact bridge 4 and the second yoke 5 to move away from the second magnetic conductive part 31.

When a system loop is short-circuited, a magnetic field is generated in the movable contact bridge 4 through short-circuit current, the first yoke iron 2 and the second yoke iron 5 surround the movable contact bridge 4 to form a magnetic conduction loop, and the first yoke iron 2 and the second yoke iron 5 are mutually attracted to inhibit the movable contact bridge 4 from being separated from a static contact.

In addition, the direct current relay for improving the short circuit resistance further comprises a fixed seat 9 and a driving rod a1, wherein the fixed seat 9 is fixedly connected with the first abutting part 11, and the driving rod a1 is fixedly connected with one end, far away from the retainer 3, of the fixed seat 9 and is used for driving the retainer 3 to move. The fixing base 9 is generally made of plastic material, and is injection molded on the holder 3 and the driving rod a1, the driving rod a1 penetrates one end of the fixing base 1, generally, the fixing base 1 is fixed inside the relay, in this embodiment, the fixing base 1 is fixed on one side of a yoke plate a2, a yoke plate a2 is fixed inside the relay, and the other side of the yoke plate is a coil, an iron core a3 and other components, when the coil drives the iron core a3 to move, the driving rod a1 is driven to move, so as to drive the holder 3 to move, but the fixing base 1 is fixed and cannot move.

Example 2:

referring to fig. 3, the embodiment of embodiment 2 is substantially the same as embodiment 1, and will not be described herein again, except that:

in this embodiment, the first yoke 2 is not fixed by the tongue 122, but the buckle 8 is adopted, the first deformation portion 12 is provided with the bayonet 123, the buckle 8 includes a third abutting portion 81 and the clamping legs 82 integrally connected to two ends of the third abutting portion 81, the clamping legs 82 are connected to the bayonet 123, and the third abutting portion 81 abuts against the first yoke 2 to fix the first yoke 2.

Example 3:

referring to fig. 4, the embodiment of embodiment 3 is substantially the same as embodiment 1, and will not be described herein again, except that:

in this embodiment, the first yoke 2 is not fixed by the tongue 122, and the first yoke body 21 and the first deformation portion 12 are directly welded, where welding methods such as resistance welding and laser welding may be adopted.

Example 4:

referring to fig. 5 and fig. 6, the embodiment of embodiment 4 is substantially the same as embodiment 1, and is not repeated here, except that:

the limiting member 6 adopted in this embodiment is different from that in embodiment 1, the two opposite sides of the limiting member 6 are formed with second bosses 62, the second deformation portion 32 is provided with a second matching hole 322, the second bosses 62 are matched with the second matching hole 322, and the second deformation portion 32 is welded to the limiting member 6.

The first yoke 2, the limiting piece 6 and the second yoke 5 form a magnetic conductive loop around the movable contact bridge 4. Therefore, when a system loop is in short circuit, the first yoke 2, the limiting piece 6 and the second yoke 5 are mutually attracted, and the brake contact bridge is prevented from being separated from the static contact.

Example 5:

referring to fig. 7, the embodiment of embodiment 5 is substantially the same as embodiment 2, and will not be described herein again, except that:

the limiting member 6 adopted in this embodiment is different from that in embodiment 2, the two opposite sides of the limiting member 6 are formed with second bosses 62, the second deformation portion 32 is provided with a second matching hole 322, the second bosses 62 are matched with the second matching hole 322, and the second deformation portion 32 is welded to the limiting member 6.

Example 6:

referring to fig. 8, the embodiment of embodiment 6 is substantially the same as embodiment 3, and will not be described herein again, except that:

the limiting member 6 adopted in this embodiment is different from that in embodiment 3, the two opposite sides of the limiting member 6 are formed with second bosses 62, the second deformation portion 32 is provided with a second matching hole 322, the second bosses 62 are matched with the second matching hole 322, and the second deformation portion 32 is welded to the limiting member 6.

Just below the utility model provides a pair of promote direct current relay's of anti short circuit ability theory of operation makes brief explanation: in embodiments 1 to 3, after the coil is powered on, the driving rod a1 assembly drives the moving contact bridge 4 and the fixed contact to close, and the stopper 6 and the upper surface of the moving contact bridge 4 have a gap (i.e. an over-travel distance, about 0.5 mm), when a large current such as a short-circuit current flows on the moving contact bridge 4, the first yoke 2 and the second yoke 5 around the moving contact bridge 4 attract each other, so that an electric repulsion force generated on the moving contact bridge 4 due to the large current can be suppressed, and further, the impact of the large current such as the short-circuit current can be resisted. Meanwhile, because the first yoke 2 is fixed inside the relay through the fixing frame 1, the first yoke 2 can resist the downward force generated by the attraction of the second yoke 5 under the condition that a large current passes through the movable contact bridge 4, thereby preventing the movable contact bridge 4 from being separated from the stationary contact.

It should be noted that, in embodiments 4 to 6, the limiting member 6 has a similar function to the first yoke 2 in addition to limiting the movable contact bridge 4, because the function of the first yoke 2 shares a part of the suction force of the second yoke 5, and it is ensured that the suction force of the limiting member 6 by the second yoke 5 is smaller than the acting force of the retaining frame 3 on the limiting member 6, so that the limiting member 6 does not move toward the movable contact bridge 4, the gap between the limiting member 6 and the movable contact bridge 4 is not reduced, and the mechanism stability is ensured.

To sum up, the utility model provides a pair of promote direct current relay of anti short circuit ability inserts very big short circuit current in the movable contact bridge, produces magnetic field on every side, makes first yoke and second yoke attract each other to restrain the separation of brake touch bridge and stationary contact, and owing to used the mount to fix first yoke, first yoke receives the suction of second yoke can not direct action at the movable contact bridge, consequently under the condition that short circuit current is very big, suction increases between first yoke and the second yoke, the movable contact bridge also can not pushed away the stationary contact, further promotes the anti short circuit ability of relay.

The above detailed description of the present invention does not limit the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a promote direct current relay of anti short circuit ability which characterized in that, includes mount, first yoke, holder, movable contact bridge, second yoke, locating part, elastic component and yoke board, wherein:

the fixing frame comprises a first abutting part and a first deformation part, the two first deformation parts are integrally connected to two opposite sides of the first abutting part, the fixing frame is fixed on one side of the yoke plate, two ends of the first yoke are respectively connected with the two first deformation parts, the first yoke and the fixing frame are encircled to form a first mounting opening, and the retainer and the limiting part are arranged in the first mounting opening;

the retainer comprises a second collision part and a second deformation part, the two second deformation parts are integrally connected to two opposite sides of the second collision part, two ends of the limiting part are respectively connected with the two second deformation parts, and the limiting part and the retainer surround to form a second mounting opening;

the movable contact bridge, the second yoke and the elastic element are arranged in the second mounting opening, the second yoke is arranged between the elastic element and the movable contact bridge, the second yoke comprises a second yoke body and two magnetic conductive parts bent towards the movable contact bridge along two sides of the second yoke body, the first yoke, the second yoke body and the two magnetic conductive parts respectively at least partially surround the periphery of the movable contact bridge, and the elastic element provides elastic force to enable the movable contact bridge to abut against the limiting part.

2. The direct-current relay with the improved short-circuit resistance as claimed in claim 1, wherein the first yoke includes a first yoke body and two first bosses respectively extending from two opposite sides of the first yoke body, the first deformation portion defines a first fitting hole, and the first bosses are connected to the first fitting hole in a fitting manner.

3. The direct current relay according to claim 2, wherein the first deformation portion further has a tongue extending toward the first fitting hole, the tongue is located at a side of the first fitting hole away from the first interference portion, and the tongue bends and presses against the first yoke to fix the first yoke.

4. The direct current relay for improving the short-circuit resistance of claim 2, further comprising a buckle, wherein the first deformation portion is provided with a bayonet, the buckle comprises a third collision portion and a clamping pin integrally connected to two ends of the third collision portion, the clamping pin is connected to the bayonet, and the third collision portion abuts against the first yoke to fix the first yoke.

5. The direct-current relay with the improved short-circuit resistance capability according to claim 2, wherein the first yoke body is welded to the first deformation portion.

6. The direct current relay according to any one of claims 3 to 5, wherein notches are formed on two sides of the second deformation portion, two bending portions extend from two opposite sides of the limiting member, the bending portions are matched with the notches and bend toward the second deformation portion to fix the limiting member and the second deformation portion, and the first yoke and the second yoke form a magnetic conductive loop around the moving bridge.

7. The direct current relay according to any one of claims 3 to 5, wherein the two opposite sides of the limiting member are formed with second bosses, the second deformation portion defines a second fitting hole, the second bosses are fitted with the second fitting hole, the second deformation portion is welded to the limiting member, and the first yoke, the limiting member and the second yoke form a magnetic conductive loop around the moving bridge.

8. The direct current relay for improving the short circuit resistance of the power transformer according to claim 1, further comprising a fixing base and a driving rod, wherein the fixing base is fixedly connected to the second abutting portion, and the driving rod is fixedly connected to an end of the fixing base away from the holder and is used for driving the holder to move.