Bridge-type electrical connection device for circuit breaker

Abstract

The present invention provides a bridge-type electrical connection device for a circuit breaker, which includes a pair of contact piece groups symmetrically arranged up and down and a mounting bracket. The contact piece group includes at least one contact piece. The contact piece is provided with a limit hole and is connected in series into a contact piece group through a fixed shaft. The left and right ends of the contact piece are provided with sliding grooves and are movably connected with elastic members. A connection bridge is connected between the elastic members of the two contact piece groups. The mounting bracket fixes the contact piece groups symmetrically arranged up and down by cooperating with the fixed shaft. In the present invention, the two contact piece groups are arranged oppositely, and an elastic member is configured for each contact piece group. The elastic members are connected by a connection bridge. The elastic member can be bent and deformed in the direction opposite to the arrangement of the contact piece groups by using the movable cooperation relationship between the elastic member and the contact piece group, so as to adjust the gap between the contact piece groups to adapt to the connection of busbars with a small thickness error.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly to a bridge-type electrical connection device applied to a circuit breaker. Background Art

[0002] The bridge-type electrical connection device (bridge-type contact) of a universal circuit breaker is an important component for connecting the main busbar of the circuit breaker body and the main busbar of the drawer base. The existing device includes a support member, a plurality of contact pieces, a plurality of elastic devices and a plurality of shafts.

[0003] At present, the bridge-type electrical connection devices using elastic piece structures on the market are mainly divided into the following two types: one is that the elastic piece adopts an external-mounted design, and a support member is provided between the contact pieces, such as a bridge-type contact of a frame circuit breaker disclosed in Patent No. CN201320881630.5; the other is that the elastic piece is an internal-mounted design, and a partition is provided in the middle of the contact pieces, which is not conducive to heat dissipation, such as an electrical connection bridge-type contact for a drawer-type circuit breaker disclosed in Patent No. CN200820087448.1.

[0004] Chinese Patent CN105762040B discloses a bridge-type contact of a frame circuit breaker. The bridge-type contact adopts an internal elastic piece structure, a set of contact pieces symmetrically arranged up and down, a mounting bracket for fixedly installing the set of contact pieces, which is fixedly installed at the outer end face between the set of contact pieces arranged up and down, connected between the set of contact pieces, an elastic device stretched in the connection direction of the set of contact pieces, and the upper and lower ends respectively abut against the set of contact pieces symmetrically arranged up and down. Referring to Figure 1 as shown, in actual use, there is a certain deviation in the thickness between the moving busbar and the static busbar, and the gap between the upper and lower sets of contact pieces in this patent is relatively fixed, resulting in great difficulty or even inability to insert the moving busbar and the static busbar, unless the thickness of the moving busbar and the static busbar is strictly controlled, but this has very high requirements for materials and post-treatment processes, or increases the cost.

[0005] Based on this, the present application is proposed. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a bridge-type electrical connection device for a circuit breaker to solve the problems of the bridge-type contact in the prior art.

[0007] To achieve the above object, the structure of the bridge-type electrical connection device for a circuit breaker of the present invention is as follows: including

[0008] a pair of sets of contact pieces symmetrically arranged up and down, each set of contact pieces includes at least one contact piece, the contact piece is provided with a limit hole and is strung into a set of contact pieces through a fixed shaft; chutes are opened at the left and right ends of the contact piece;

[0009] An elastic member, the two ends of which are respectively inserted into the left and right chutes of the contact piece group;

[0010] A connecting bridge, located between the elastic members of the two contact piece groups and fixedly connected to the middle parts of the elastic members;

[0011] An installation bracket, arranged on or near the end face of the contact piece group, having fixing holes corresponding to the fixing shafts, and the end parts of the fixing shafts penetrate through the fixing holes;

[0012] The length of the limiting hole or the fixing hole in the up and down direction is greater than its length in the left and right direction, so that the fixing shaft can move relative to the limiting hole or the fixing hole in the up and down direction.

[0013] In the above technical solution, the two ends of the elastic member are movably inserted into the contact piece group. Since the elastic member itself has elasticity, when the gap between the two contact piece groups is increased, the two contact piece groups move away from each other. During this process, the two ends of the elastic member are passively moved outwards, that is, a small displacement of the two ends from the chute occurs. Therefore, when a busbar with a thickness slightly greater than the gap is inserted into the gap between the symmetrically arranged contact piece groups in the up and down direction, through the cooperation relationship between the contact piece group and the two ends of the elastic member, the relative gap between the contact piece groups is adaptively adjusted by using the displacement in the up and down direction generated by the bending deformation of the elastic member.

[0014] In the prior art, since the elastic device is deformed by being stretched, for a ductile object, especially the arc-shaped elastic piece structure shown in the specific embodiment of the prior patent, to make it undergo tensile deformation, the required tensile force is much greater than the acting force generated by the bending deformation of the elastic member in the present invention.

[0015] Therefore, compared with the technical solution of the elastic device stretched in the connection direction of the contact piece group adopted in the prior art, the present invention overcomes the application defect that the tensile force required for the elastic device to deform in the stretching direction in the prior art is greater than the tensile force that the device structure can generate during the actual insertion of the busbar, fully considers the actual application situation, and has a simple structure and is suitable for practical use.

[0016] The present invention is further provided as follows: The installation bracket is detachably and fixedly connected to the connecting bridge. Connecting the installation bracket and the connecting bridge can ensure that the installation bracket, the contact piece group, the connecting bridge and other structures form an integral body for easy use, and at the same time keep the installation bracket and the contact piece group in a relatively fixed state for easy installation of the fixing shaft.

[0017] The above structure is simple and convenient for assembly.

[0018] The present invention is further configured as follows: The elastic member is composed of several elastic sheets that are parallel to each other and integrally connected in the middle; combining multiple elastic sheets into one body is conducive to rapid assembly, and the design of using multiple elastic sheets is also conducive to reducing the contact area between the elastic member and the contact piece group, increasing the gap between the contact piece group and the elastic member, and facilitating heat dissipation.

[0019] The present invention is further configured as follows: The left and right ends of each elastic sheet are inserted into the sliding grooves formed in the contact pieces or between the sliding grooves on adjacent contact pieces. Through the insertion fit between the elastic sheet and the sliding groove, the relative movement between the elastic sheet and the sliding groove is realized, laying the foundation for the change of the relative gap between the contact piece groups.

[0020] To simplify the structural design, preferably, strip-shaped or waist-shaped limiting holes are provided in the middle of the contact pieces.

[0021] Preferably, there is one strip-shaped or waist-shaped limiting hole. Or further, the arc of the elastic member protrudes towards the side where the connecting bridge is located.

[0022] The present invention is further configured as follows: At least one protrusion is provided on the end face of the contact piece to space adjacent contact pieces apart when two or more contact pieces are stacked to form a contact piece group.

[0023] The present invention is further configured as follows: The mounting bracket further includes extension portions extending leftward and / or rightward from both ends of the mounting portion where the fixing holes are located.

[0024] The present invention is further configured as follows: The contact piece includes a body and end portions at the left and right ends of the body that are inclined towards one side of the body, and the sliding groove is the gap formed between the end portion and the body.

[0025] The present invention is further configured as follows: The sliding groove is provided on the opposite side of the upper and lower contact piece groups, which is not only convenient for the installation of the elastic member but also adapts to the change in the bending deformation of the elastic member; in addition, its structural design is compact and conducive to reducing the overall volume.

[0026] The beneficial effects of the present invention are as follows: In the present invention, two contact piece groups are arranged opposite to each other, and an elastic member is configured for each contact piece group. The elastic members are connected by a connecting bridge. By using the movable cooperation relationship between the elastic member and the contact piece group, the elastic member can be bent and deformed in the direction opposite to the contact piece groups, so that the gap between the contact piece groups can be adjusted to adapt to the connection of busbars with a small thickness error. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall specific embodiment of the present invention.

[0028] Figure 2Schematic diagram of the internal structure of a specific embodiment of the present invention.

[0029] Figure 3 is Figure 2 a top view schematic diagram.

[0030] Figure 4 is Figure 3 a sectional view taken along the direction A of

[0031] Figure 5 is Figure 3 a sectional view taken along the direction B of

[0032] Figure 6 Schematic diagram of the elastic member of a specific embodiment of the present invention.

[0033] Figure 7 Schematic diagram of the contact piece structure of a specific embodiment of the present invention.

[0034] Figure 8 Stereoscopic schematic diagram of the contact piece of a specific embodiment of the present invention.

[0035] Reference numerals: 1 - mounting bracket 1, 2 - elastic member 1, 3 - contact piece group 1, 4 - contact piece group 2, 5 - fastening screw, 6 - connecting bridge, 7 - elastic member 2, 8 - fixed shaft 2, 9 - fixed shaft 1;

[0036] 210 - middle part, 220 - connecting hole, 230 - elastic piece, 300 - contact piece body, 310 - contact piece, 301 - limiting hole, 302 - protrusion, 303 - end part, 304 - sliding groove, 305 - inner convex part. Specific embodiments

[0037] The present invention provides a bridge - type electrical connection device for a circuit breaker, which includes a pair of symmetrically arranged upper and lower contact piece groups 310, and a connecting component composed of an elastic connecting bridge 6 is arranged between the two contact piece groups 310. Among them, the elastic member is movably inserted and matched with the contact piece group 310, so that the relative gap between the two contact piece groups 310 is adjustable, thereby facilitating the insertion and use of busbars (or bus lines) with different thicknesses in practical applications.

[0038] The following further describes the present invention with specific embodiments.

[0039] It should be particularly noted that in the present invention, the terms of upper - lower symmetry and left - right directionality appearing therein are used to facilitate the description of the relative positional relationship of each component in the present invention, and do not specifically refer to a certain specific direction.

[0040] Embodiment 1 is as Figure 2As shown, this embodiment provides a bridge-type electrical connection device for a circuit breaker, which includes a contact piece 310 group 1 3, a contact piece 310 group 2 4, an elastic member 1 2, an elastic member 2 7, a connecting bridge 6, and a Figure 3 As shown, the contact piece 310 group 1 3 and the contact piece 310 group 2 4 are symmetrically spaced apart in the upper and lower parts, and the contact piece 310 group is composed of a plurality of stacked contact pieces 310: an oval limiting hole 301 is opened in the middle of the contact piece 310, and is connected in series to form the contact piece 310 group 1 3 / contact piece 310 group 2 4 through the fixed shaft 1 9 / fixed shaft 2 8. In order to prevent the adjacent contact pieces 310 from directly contacting each other and causing heat accumulation and failure to dissipate heat, a circular or hemispherical protrusion 302 is respectively provided on the end faces of the left and right ends of the contact piece 310, so that the adjacent contact pieces 310 are combined to maintain a certain interval to facilitate heat dissipation.

[0041] As mentioned above, the contact piece 310 includes a body, and end portions 303 located at the left and right ends of the body and inclined toward one side of the body, and a sliding groove 304 inclined in the same direction as the end portion 303 is provided at the gap between the end portion 303 and the body. Figure 6 As shown, the elastic member 1 2 and the elastic member 2 7 are arc-shaped structures, and are composed of a plurality of elastic sheets 230 which are parallel to each other and connected into one body in the middle (for the convenience of description, this part of the structure can be defined as the middle part 210) - the left and right ends of the elastic sheet 230 are bent inwards. Figure 2 As shown, the left and right ends of each elastic piece 230 of the elastic piece 1 2 and the elastic piece 2 7 are inserted into the slide groove 304 opened on the contact piece 310 at a corresponding position. The middle part 210 is provided with spaced connection holes 220, and the elastic piece 1 2 and the elastic piece 2 7 can be arranged with the connection bridge 6 facing away (the bending direction is away from the side where the connection bridge 6 is located) and the elastic piece 1 2, the connection bridge 6 and the elastic piece 2 7 can be detachably fixedly connected as a small component through the connection hole 220 and the fastening bolts. In this way, when the elastic piece 1 2 and the elastic piece 2 7 are respectively connected to the slide groove 304 on the contact piece 310 group 1 3 and the contact piece 310 group 2 4, the contact piece 310 group 1 3 and the contact piece 310 group 2 4 can be connected as a whole through the small component.

[0042] In the structure described in the previous paragraph, since the elastic member 1 2, the elastic member 2 7 and the contact piece 310 group 1 3 and the contact piece 310 group 2 4 are movably engaged with each other through the two ends of the elastic piece 230 and the slide groove 304, the relative gap between the contact piece 310 group 1 3 and the contact piece 310 group 2 4 can be adjusted by the compression deformation generated between the elastic member 1 2 and the elastic member 2 7 in the bending direction and the insertion depth of the elastic member 1 2 and the elastic member 2 7 in the slide groove 304, so as to adapt to the use of busbars or busbars with different thicknesses.

[0043] To fix the fixed shaft one 9 and the fixed shaft two 8, on the outer end surfaces (i.e., Figure 1 the upper surface and the lower surface shown in

[0044] ), on two end faces on one side of the contact piece 310 group one 3 and the contact piece 310 group two 4, the mounting bracket one 1 and the mounting bracket two are detachably and fixedly installed respectively. The mounting bracket one 1 and the mounting bracket two are respectively fixed to the connecting bridge 6 through the fastening screws 55.

[0045] The contact piece 310 group one 3 and the contact piece 310 group two 4 can be respectively movable within a certain range through the clearance fit between the waist-shaped limiting holes 301 on it and the fixed shaft one 9 or the fixed shaft two 8, so as to realize the clearance adjustment described above.

[0046] In addition, the shape of the limiting hole 301 can also be rectangular or strip-shaped, as long as the length direction of the limiting hole 301 is set along the direction symmetrically up and down on the contact piece 310 group one 3 and the contact piece 310 group two 4.

[0047] Embodiment 2 The difference between this embodiment and Embodiment 1 is that: in this embodiment, 2 to 3 waist-shaped limiting holes 301 are provided on the contact piece 310. Taking 2 waist-shaped limiting holes 301 as an example - the 2 waist-shaped limiting holes 301 are respectively arranged at the left end and the right end of the contact piece 310 body 300, and each of the 2 waist-shaped limiting holes 301 is provided with a fixed shaft to connect a plurality of contact pieces 310 in series into a group of contact pieces 310 group. The rest of the structure is as described in Embodiment 1.

[0048] Embodiment 3 The difference between this embodiment and the above embodiments is that: in this embodiment, a fixed shaft adapted to its aperture is inserted through the limiting hole 301, the fixed hole on the mounting bracket is a waist-shaped hole or rectangular or strip-shaped, and the length direction of the limiting hole 301 is set along the direction symmetrically up and down on the contact piece 310 group one 3 and the contact piece 310 group two 4.

[0049] Thus, the contact piece 310 group one 3 and the contact piece 310 group two 4 can adjust the relative clearance between them through the clearance fit in the up and down direction between the fixed shaft on it and the waist-shaped hole or rectangular or strip-shaped.

[0050] Embodiment 4 The difference between this embodiment and the above embodiments lies in that: in this embodiment, the limiting hole 301 is a fixed shaft that passes through it and is adapted to its aperture, and the aperture of the fixing hole on the first mounting bracket 1 or the second mounting bracket is also adapted to the rod diameter of the end 303 of the fixed shaft. The first elastic member 2 and / or the second elastic member 7 are threadedly connected to the connection bridge 6 through fastening screws 5. By adjusting the depth of the fastening screws 5 inserted into the interior of the connection bridge 6, the relative distance between the first elastic member 2 and / or the second elastic member 7 and the connection bridge 6 can be adjusted, and thus the relative gap between the first contact piece group 3 and the second contact piece group 4 that are respectively connected in cooperation with the first elastic member 2 and the second elastic member 7 can be adjusted.

[0051] Embodiment 5 The difference between this embodiment and the above embodiments lies in that: in this embodiment, the sliding groove 304 can be horizontally arranged in the left and right directions. In this structure, the obstruction of the groove wall of the sliding groove 304 to the bending deformation of the elastic member will be greater than that of the inclined sliding groove 304 in the above embodiments. Therefore, it is possible to consider further increasing the elasticity or flexibility of the elastic member to make up for the above deficiencies.

[0052] The specific application process of the above embodiments is as follows: When inserting the busbar (bus), the first contact piece group 3 and the second contact piece group 4 are respectively pushed upward and downward, the first elastic member 2 and the second elastic member 7 are simultaneously bent and deformed, and the two ends of the first elastic member 2 and the second elastic member 7 move outward in the sliding groove 304, and the gap between the first contact piece group 3 and the second contact piece group 4 is passively adjusted to accommodate the insertion of the busbar (bus).

[0053] In summary, the present invention provides a connection for a busbar (bus) that can adapt to a certain error in thickness, which overcomes the defect in the prior art that it is difficult to actually use due to the large stretching deformation obstacle of the elastic piece 230, meets the actual use requirements, has a simple structure, a reasonable design, and is easy to implement.

Claims

1. A bridge-type electrical connection device for a circuit breaker, characterized in that: It includes a pair of contact piece groups symmetrically arranged up and down. Each contact piece group includes at least one contact piece. The contact piece is provided with a limiting hole and is strung into a contact piece group through a fixed shaft. The left and right ends of the contact piece are provided with sliding grooves. An elastic member, the two ends of which are respectively inserted into the sliding grooves at the left and right ends of the contact piece group. A connecting bridge, located between the elastic members of the two contact piece groups and fixedly connected to the middle of the elastic member. An installation bracket, arranged on or near the end face of the contact piece group, having a fixing hole corresponding to the fixed shaft, and the end of the fixed shaft passes through the fixing hole. The length of the limiting hole or the fixing hole in the up and down direction is greater than its length in the left and right direction.

2. The bridge-type electrical connection device for a circuit breaker according to claim 1, wherein: The installation bracket is detachably and fixedly connected to the connecting bridge.

3. The bridge-type electrical connection device for a circuit breaker according to claim 1 or 2, characterized in that: The elastic member is arc-shaped.

4. The bridge-type electrical connection device for a circuit breaker according to claim 3, wherein: The convex side of the arc of the elastic member faces the side where the connecting bridge is located.

5. The bridge-type electrical connection device for a circuit breaker according to any one of claims 1, 2, and 4, characterized in that: The elastic member is composed of several elastic pieces that are parallel to each other and connected into one body in the middle. The left and right ends of each elastic piece are inserted into the sliding grooves opened on the contact piece or between the sliding grooves opened on two adjacent contact pieces.

6. The bridge-type electrical connection device for a circuit breaker according to claim 5, wherein: A strip-shaped or waist-shaped limiting hole is arranged in the middle of the contact piece; and / or, on each contact piece, there is one strip-shaped or waist-shaped limiting hole.

7. The bridge-type electrical connection device for a circuit breaker according to any one of claims 1, 2, 4, and 6, characterized in that: At least one protrusion is arranged on the end face of the contact piece to make adjacent contact pieces spaced apart when two or more contact pieces are stacked to form a contact piece group.

8. The bridge-type electrical connection device for a circuit breaker according to any one of claims 1, 2, 4, and 6, characterized in that: The installation bracket further includes extension parts extending leftward and / or rightward from both ends of the installation part where the fixing hole is located.

9. The bridge-type electrical connection device for a circuit breaker according to claim 8, wherein: The contact piece includes a body and ends at the left and right ends of the body that are inclined toward one side of the body. The sliding groove is the gap formed between the end and the body.

10. The bridge-type electrical connection device for a circuit breaker according to claim 1, characterized in that: The sliding groove is arranged on the opposite side of the upper and lower contact piece groups.

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