阅读说明：本技术 一种抗短路能力提升开关装置的动触桥保持结构 (Movable contact bridge retaining structure of short-circuit resistance improving switch device ) 是由 不公告发明人 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种抗短路能力提升开关装置的动触桥保持结构,包括保持架、顶板、动触桥、导磁件以及弹性件,其中：保持架与顶板两端固定连接并合围形成两端开口的安装口,导磁件设置在安装口内并与动触桥连接,弹性件设置在安装口内,并与导磁件抵接,以提供导磁件以及动触桥指向顶板的力；动触桥抵触并导通两静触头且动触桥中通入短路电流时,顶板和导磁件由于电生磁互相吸引,以抑制动触桥与静触头分离。本发明动触桥和静触头抵触导通后,若动触桥中流过极大的短路电流,动触桥周围形成强磁场,导磁件和顶板在磁场作用下互相吸引,从而对动触桥产生作用力,以抑制动触桥和静触头分离。(The invention discloses a moving contact bridge holding structure of a short-circuit resistance improving switch device, which comprises a holder, a top plate, a moving contact bridge, a magnetic conduction piece and an elastic piece, wherein: the holder is fixedly connected with two ends of the top plate and encloses to form an installation opening with two open ends, the magnetic conduction piece is arranged in the installation opening and connected with the movable contact bridge, and the elastic piece is arranged in the installation opening and abutted against the magnetic conduction piece so as to provide the force of the magnetic conduction piece and the movable contact bridge pointing to the top plate; when the movable contact bridge is abutted and conducted with the two fixed contacts and short-circuit current is introduced into the movable contact bridge, the top plate and the magnetic conduction piece attract each other due to electromagnetism, so that the movable contact bridge is prevented from being separated from the fixed contacts. After the movable contact bridge and the fixed contact are in contact conduction, if a large short-circuit current flows in the movable contact bridge, a strong magnetic field is formed around the movable contact bridge, and the magnetic conduction piece and the top plate are mutually attracted under the action of the magnetic field, so that acting force is generated on the movable contact bridge to inhibit the movable contact bridge and the fixed contact from being separated.)

1. The utility model provides an anti short circuit ability promotes switching device's movable contact bridge keeps structure, contradicts with the static contact, its characterized in that, includes holder, roof, movable contact bridge, magnetic conduction spare and elastic component, wherein:

the retainer is fixedly connected with the two ends of the top plate and encloses to form an installation opening with two open ends, and the straight line of the opening direction of the installation opening is a first axis;

the movable contact bridge is arranged in the mounting opening along the first axis and abuts against the top plate;

the magnetic conduction piece is arranged in the mounting opening and connected with the movable contact bridge, the magnetic conduction piece comprises a supporting part and bending parts, the two bending parts are respectively connected to two ends of the supporting part and arranged around the movable contact bridge along the circumferential direction of the first axis with the supporting part, and one ends of the two bending parts, which are respectively far away from the supporting part, are opposite to the top plate;

the elastic part is arranged in the mounting opening and is abutted against the magnetic conduction part;

when the movable contact bridge is abutted against and conducted with the two static contacts and short-circuit current is introduced into the movable contact bridge, the top plate and the magnetic conduction piece attract each other due to electromagnetic induction, so that the movable contact bridge is prevented from being separated from the static contacts.

2. The moving contact bridge holding structure of a short-circuit resistance improving switch device as claimed in claim 1, wherein the moving contact bridge has a rectangular cross section along the normal plane of the first axis, and four sides of the moving contact bridge surrounding the first axis are respectively opposite to the top plate, the two bending portions and the abutting portion.

3. The moving contact bridge holding structure of a short-circuit resistance improving switch device as claimed in claim 1, wherein a side of said moving contact bridge abutting said abutting portion forms a first engaging portion, a side of said abutting portion abutting said moving contact bridge forms a second engaging portion, and said first engaging portion engages with said second engaging portion to position said moving contact bridge along said first axial direction.

4. The moving contact bridge holding structure of a short circuit resistance improving switching device as claimed in claim 3, wherein said first fitting portion is a boss and said second fitting portion is a groove.

5. The moving contact bridge holding structure of the anti-short circuit capability lifting switch device according to claim 1, wherein two ends of the holder are provided with positioning openings, two opposite sides of the top plate are respectively formed with positioning bosses, the holder further comprises a spring portion, the spring portion is located on one side of the positioning opening far away from the mounting opening, the positioning bosses are arranged in the positioning openings, the size of the positioning openings in the thickness direction of the positioning bosses is smaller than the thickness of the positioning bosses, and the spring portion is bent towards the top plate to abut against the top plate.

6. The movable contact bridge holding structure of the anti-short circuit capability lifting switch device according to claim 1, wherein two ends of the holder are provided with positioning openings, the top plate comprises a first plate body and a second plate body, the first plate body is fixedly connected with the second plate body, the holder further comprises an elastic pressing portion, the elastic pressing portion is located on one side, away from the mounting opening, of the positioning opening, the first plate body is arranged in the positioning opening, the size of the positioning opening in the thickness direction of the first plate body is smaller than that of the first plate body, the elastic pressing portion is bent towards the first plate body to be abutted against the first plate body, and two opposite sides of the second plate body are abutted against the holder to limit the second plate body in the direction of the two positioning openings.

7. The moving contact bridge holding structure of a short circuit resistance improving switch device according to claim 1, further comprising a fixing seat fixedly connected to an end of the holder away from the top plate.

8. The structure as claimed in claim 7, wherein the abutting portion has a first positioning groove on a side thereof away from the moving contact bridge, the elastic member is engaged with the first positioning groove to position the magnetic conductive member, a second positioning groove is formed on a side of the fixing base adjacent to the magnetic conductive member, and the elastic member is engaged with the second positioning groove to position the elastic member.

9. The moving contact bridge holding structure of an anti-short circuit capability improving switch device according to claim 7, further comprising a driving rod fixedly connected with one end of the fixed seat far away from the elastic member.

10. The moving contact bridge holding structure of a short-circuit resistance enhanced switch device as claimed in claim 1, wherein a normal of an abutting surface of said top plate and said moving contact bridge is a second axis, said elastic member is disposed in said mounting opening along the second axis and abuts against said magnetic conductive member to provide a force of said magnetic conductive member and said moving contact bridge toward said top plate along the second axis.

Technical Field

The invention relates to the technical field of switch devices, in particular to a movable contact bridge holding structure of a short-circuit resistance improving switch device.

Background

For the direct current relay with the direct-acting magnetic circuit structure in the prior art, the direct current relay is internally driven by a movable contact bridge and a static contact connected with the outside through a magnetic circuit system to realize the switching-on and switching-off functions, when the direct current relay is in a short circuit condition in practical application, an electric repulsion force is generated in the contact area of the movable contact bridge and the static contact, the repulsion force pushes the movable contact bridge open under the condition of large enough force, and the abnormal switching-off arcing combustion and even explosion of the relay are caused.

For the direct current relay applied to the electric automobile industry at present, due to the increasing energy of a battery system, the short-circuit resistance of the direct current relay is required to be further improved, and meanwhile, the consideration of the overall dimension and the cost of the switch device is also compatible.

The most core mechanism of the relay is a movable contact bridge holding structure, and in order to improve the short-circuit resistance of the relay, the movable contact bridge structure needs to be improved.

Disclosure of Invention

The invention aims to overcome the technical defects and provide a moving contact bridge holding structure of a short-circuit resistance improving switch device, which is used for solving the problem of poor short-circuit resistance of a relay in the prior art.

In order to achieve the technical purpose, the technical scheme of the invention is as follows: the utility model provides an anti short circuit ability promotes switching device's movable contact bridge retaining structure, includes holder, roof, movable contact bridge, magnetic conduction spare and elastic component, wherein: the retainer is fixedly connected with two ends of the top plate and surrounds the top plate to form a mounting opening with two open ends, and the straight line of the opening direction of the mounting opening is a first axis; the movable contact bridge is arranged in the mounting opening along the first axis and is abutted against the top plate; the magnetic conduction piece is arranged in the mounting opening and connected with the movable contact bridge, the magnetic conduction piece comprises a butting part and a bending part, the two bending parts are respectively connected with two ends of the butting part and are arranged around the movable contact bridge along the circumferential direction of the first axis with the butting part, and one ends of the two bending parts, which are respectively far away from the butting part, are opposite to the top plate; the elastic piece is arranged in the mounting opening and is abutted against the magnetic conduction piece so as to provide the force of the magnetic conduction piece and the movable contact bridge to the top plate; when the movable contact bridge is abutted and conducted with the two fixed contacts and short-circuit current is introduced into the movable contact bridge, the top plate and the magnetic conduction piece attract each other due to electromagnetism, so that the movable contact bridge is prevented from being separated from the fixed contacts.

Preferably, the cross section of the movable contact bridge along the normal plane of the first axis is rectangular, and four side surfaces of the movable contact bridge surrounding the first axis are respectively opposite to the top plate, the two bending parts and the abutting part.

Preferably, the side of the movable contact bridge abutting against the abutting part forms a first matching part, the side of the abutting part abutting against the movable contact bridge forms a second matching part, and the first matching part is matched with the second matching part to position the movable contact bridge along the first axial direction.

Preferably, the first fitting portion is a boss, and the second fitting portion is a groove.

Preferably, the two ends of the retainer are provided with positioning openings, two opposite sides of the top plate are respectively provided with a positioning boss, and the positioning bosses are matched with the positioning openings to position and fix the top plate.

Preferably, the locating openings are formed in the two ends of the retainer, the top plate comprises a first plate body and a second plate body, the first plate body is fixedly connected with the second plate body, the first plate body is arranged in the locating openings and is limited by the locating openings, and the two opposite sides of the second plate body are abutted against the retainer so as to form the direction limiting second plate body along the two locating openings.

Preferably, the moving contact bridge holding structure of the short-circuit resistance improving switch device further comprises a fixed seat, and the fixed seat is fixedly connected with one end, far away from the top plate, of the retainer.

Preferably, the side of the abutting part far away from the movable contact bridge is provided with a first positioning groove, the elastic element is matched with the first positioning groove to limit the magnetic conduction element, one side of the fixing seat close to the magnetic conduction element is provided with a second positioning groove, and the elastic element is matched with the second positioning groove to limit the elastic element.

Preferably, the movable contact bridge holding structure of the short-circuit resistance improving switch device further comprises a driving rod, and the driving rod is fixedly connected with one end, far away from the elastic piece, of the fixed seat.

Preferably, the normal of the abutting surface of the top plate and the movable contact bridge is a second axis, and the elastic element is arranged in the mounting opening along the second axis and abutted against the magnetic conduction element so as to provide a force for the magnetic conduction element and the movable contact bridge to point to the top plate along the second axis.

Compared with the prior art, the invention has the beneficial effects that: after the movable contact bridge and the fixed contact are in contact conduction, if a large short-circuit current flows in the movable contact bridge, a strong magnetic field is formed around the movable contact bridge, and the magnetic conduction piece and the top plate are mutually attracted under the action of the magnetic field, so that acting force is generated on the movable contact bridge to inhibit the movable contact bridge and the fixed contact from being separated.

Drawings

Fig. 1 is a perspective view of a first embodiment of a moving contact bridge holding structure and a fixed contact of a short-circuit resistance enhancing switching device according to the present invention;

FIG. 2 is an exploded view of a first embodiment of a moving contact bridge holding structure of the anti-short circuit capability boosting switching device provided by the invention;

FIG. 3 is a top view of a first embodiment of a moving contact bridge holding structure of the anti-short circuit capability boosting switching device provided by the present invention;

FIG. 4 is a cross-sectional view taken at A in FIG. 3;

FIG. 5 is a cross-sectional view at B in FIG. 3;

FIG. 6 is a perspective view of a second embodiment of a moving contact bridge holding structure of the anti-short circuit capability boosting switching device provided by the present invention;

FIG. 7 is an exploded view of a second embodiment of the moving contact bridge holding structure of the anti-short circuit capability boosting switching device provided by the present invention;

FIG. 8 is a top view of a second embodiment of the moving contact bridge holding structure of the anti-short circuit capability enhancement switching device provided by the present invention;

FIG. 9 is a cross-sectional view at C of FIG. 8;

FIG. 10 is a cross-sectional view taken at D of FIG. 8;

reference numerals: the positioning device comprises a holder 1, a top plate 2, a top plate 3, a mounting port 4, a first axis, a movable contact bridge 5, a magnetic conduction member 6, an elastic member 7, a fixing seat 8, a driving rod 9, a second axis 10, a positioning port 11, a pressing part 12, a positioning boss 21, a first plate 22, a second plate 23, a first matching part 51, a butting part 61, a bending part 62, a second positioning groove 81, a second matching part 611 and a first positioning groove 612.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 fig. 2, the present embodiment provides a moving contact bridge holding structure of a short-circuit resistance enhanced switching device, which includes a holder 1, a top plate 2, a moving contact bridge 5, a magnetic conduction member 6, and an elastic member 7, wherein:

referring to fig. 3, 4 and 5, the holder 1 is fixedly connected with two ends of the top plate 2 and encloses to form an installation opening 3 with two open ends, and a straight line of the opening direction of the installation opening 3 is a first axis 4.

The movable contact bridge 5 is arranged in the mounting opening 3 along the first axis 4 and is abutted against the top plate 2, and the movable contact bridge 5 is arranged between the two fixed contacts in a spanning mode.

The magnetic conduction member 6 is arranged in the mounting opening 3 and connected with the movable contact bridge 5, the magnetic conduction member 6 comprises a supporting portion 61 and a bending portion 62, the two bending portions 62 are respectively connected with two ends of the supporting portion 61 and are arranged around the movable contact bridge 5 along the circumferential direction of the first axis 4 with the supporting portion 61, specifically, the cross section of the movable contact bridge 5 along the normal plane of the first axis 4 is rectangular, the four side surfaces of the movable contact bridge 5 around the first axis 4 are respectively opposite to the top plate 2, the two bending portions 62 and the supporting portion 61, one end of each bending portion 62 far away from the supporting portion 61 is opposite to the top plate 2, it should be noted that the smaller the gap between the bending portion 62 and the top plate 2 is better, so that the magnetic force between the magnetic conduction member 6 and the top plate 2 is stronger, therefore, preferably, when the movable contact bridge 5 and the top plate 2, the bending portion 62 just collides with the top plate 2, and collides with an external circuit connected with a static contact, namely, when the movable contact bridge 5 passes through a, the current intensity is very high, a magnetic field is generated, the top plate 2 and the magnetic conduction piece 6 which are arranged around the movable contact bridge 5 can be mutually attracted, and therefore the separation of the movable contact bridge 5 and the static contact is restrained. It should be noted that both the top plate 2 and the magnetic conduction member 6 need to be magnetic conductive, and therefore are made of ferromagnetic materials, such as iron.

To specifically describe the connection structure of the holder 1 and the top plate 2, please refer to fig. 2 and 5, two ends of the holder 1 are provided with positioning openings 11, two opposite sides of the top plate 2 respectively form positioning bosses 21, the holder 1 further comprises an elastic part 12, the elastic part 12 is located on one side of the positioning opening 11 far away from the mounting opening 3, the positioning bosses 21 are arranged in the positioning openings 11, the size of the positioning openings 11 along the thickness direction of the positioning bosses 21 is smaller than the thickness of the positioning bosses 21, the elastic part 12 is bent towards the top plate 2 to abut against the top plate 2, the top plate 2 can be abutted against one side of the positioning openings 11 close to the mounting opening 3, the shoulders of the positioning bosses 21 abut against the holder 1, and the positioning bosses 21 are matched with the positioning openings 11 to position and fix.

To specifically describe the connection structure of the movable contact bridge 5 and the magnetic conductive member 6, please refer to fig. 2 and fig. 4, a first matching portion 51 is formed on the abutting side of the movable contact bridge 5 and the abutting portion 61, a second matching portion 611 is formed on the abutting side of the abutting portion 61 and the movable contact bridge 5, and the first matching portion 51 and the second matching portion 611 are matched to position the movable contact bridge 5 along the first axis 4 direction. Specifically, in the present embodiment, the first fitting portion 51 is a boss, the second fitting portion 611 is a groove, and since the groove is disposed at the edge of the movable contact bridge 5 and is semi-open, each groove can only limit the movable contact bridge 5 in one direction, and therefore two grooves with opposite openings need to be disposed respectively to position the movable contact bridge 5 in the direction of the first axis 4.

The elastic part 7 is arranged in the mounting opening 3 and is abutted to the magnetic conduction part 6, the other end of the elastic part is abutted to the retainer 1 so as to provide force for the magnetic conduction part 6 and the movable contact bridge 5 to point to the top plate 2, and preferably, the elastic part 7 is a spring. Specifically, in this embodiment, this movable contact bridge retaining structure of anti short circuit ability lift switching device still includes fixing base 8, and fixing base 8 and holder 1 keep away from the one end fixed connection of roof 2, connect elastic component 7 through fixing base 8, and fixing base 8 is the plastic part, injection moulding, and holder 1 and actuating lever 9 are the metalwork. Specifically, the side of the abutting portion 61 away from the movable contact bridge 5 is provided with a first positioning groove 612, the elastic element 7 is matched with the first positioning groove 612 to limit the magnetic conduction element 6, one side of the fixed seat 8 close to the magnetic conduction element 6 is provided with a second positioning groove 81, and the elastic element 7 is matched with the second positioning groove 81 to limit the elastic element 7. The normal line of the abutting surface of the top plate 2 and the movable contact bridge 5 is a second axis 10, the elastic piece 7 is arranged in the mounting opening 3 along the second axis 10 and abutted against the magnetic conduction piece 6 to provide a force for the magnetic conduction piece 6 and the movable contact bridge 5 to point to the top plate 2 along the second axis 10, therefore, when the retainer 1 moves towards the fixed contact along the second axis 10, the movable contact bridge 5 and the magnetic conduction piece 6 can move together with the retainer 1 until the movable contact bridge 5 abuts against the fixed contact, if the retainer 1 continues to move, the movable contact bridge 5 still abuts against the fixed contact, therefore, the elastic piece 7 is compressed, the elastic force is enhanced, the movable contact bridge 5 abuts against the fixed contact by certain elastic force, and the reliable connection of the whole device can be ensured when the whole device works under complex environments such as certain vibration.

As a preferred embodiment, the movable contact bridge holding structure of the short-circuit resistance improving switch device further comprises a driving rod 9, and the driving rod 9 is fixedly connected with one end of the fixed seat 8 far away from the elastic piece 7. The driving rod 9 is connected with the iron core of the magnetic circuit part, when the magnetic circuit part is electrified, magnetic force is generated to drive the iron core and the driving rod 9 to move, so that the whole retainer 1 and the movable contact bridge 5 are driven to move, the specific structure of the magnetic circuit part is the existing structure, and the detailed description is omitted.

Example 2:

referring to fig. 6, 7, 8, 9 and 10, an embodiment 2 is substantially the same as the embodiment 1, and will not be described herein again, except that two ends of the holder 1 are provided with positioning holes 11, the top plate 2 is designed as a separate body, the top plate 2 includes a first plate 22 and a second plate 23, the first plate 22 and the second plate 23 are fixedly connected, specifically, the first plate 22 and the second plate 23 can be connected by riveting, welding or the like, in this embodiment, riveting is adopted,

retainer 1 still includes suppress splenium 12, suppress splenium 12 is located location mouthful 11 one side of keeping away from installing port 3, first plate body 22 sets up in location mouthful 11, location mouthful 11 is less than first plate body 22 thickness along first plate body 22 thickness direction size, suppress splenium 12 to buckle in order to support to press in first plate body 22, can support first plate body 22 to press in the one side that is close to installing port 3 in location mouthful 11, the two opposite sides of second plate body 23 are contradicted with retainer 1, in order to set up the spacing second plate body 23 of direction along two location mouthful 11.

The split design has the advantages that: the first plate 22 is relatively thin, made of stainless steel or iron, and has no magnetic conductivity or poor magnetic conductivity, and the second plate 23 is made of magnetic conductive material, so that the magnetic force dispersion between the second plate 23 and the magnetic conductive member 6 is small, and the suction force between the second plate 23 and the magnetic conductive member 6 is larger.

The working principle of the moving contact bridge holding structure of the anti-short circuit capability improving switch device provided by the invention is described in detail as follows: when the magnetic circuit part is electrified, a magnetic field is generated to drive the driving rod 9 and the retainer 1 to move towards the fixed contact until the movable contact bridge 5 is abutted against the fixed contact, the two fixed contacts connected with an external circuit are conducted, the retainer 1 continues to move, the elastic piece 7 is compressed, the movable contact bridge 5 is abutted against the fixed contact with a certain force, if the external circuit is short-circuited, a strong magnetic field is locally generated at the contact part of the fixed contact and the movable contact bridge 5, the fixed contact and the movable contact bridge 5 have mutually repulsive magnetic force, meanwhile, a large current flows in the movable contact bridge 5, the top plate 2 and the magnetic conduction piece surrounding the movable contact bridge 5 also generate the magnetic field, the top plate 2 and the magnetic conduction piece attract each other, and the movable contact bridge 5 and the fixed contact are prevented from being.

In summary, according to the moving contact bridge holding structure of the switch device with the short-circuit resistance improving function, after the moving contact bridge and the fixed contact are in contact conduction, if a large short-circuit current flows in the moving contact bridge, a strong magnetic field is formed around the moving contact bridge, and the magnetic conduction piece and the top plate are attracted to each other under the action of the magnetic field, so that an acting force is generated on the moving contact bridge to inhibit the moving contact bridge and the fixed contact from being separated.

The above embodiments of the present invention should not be construed as limiting 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 protection scope of the claims of the present invention.