Drawer type circuit breaker busbar connection structure

Abstract

The utility model discloses a drawer type circuit breaker busbar connection structure, which comprises a circuit breaker busbar, a drawer seat busbar, a contact assembly and a rear connection busbar, the contact assembly comprises two rows of bridge-shaped contact groups arranged in parallel along a first direction, two first contact bulges of the circuit breaker busbar are inserted into first clamping ports of the two rows of bridge-shaped contact groups, and two second contact bulges of the circuit breaker busbar are inserted into second clamping ports of the two rows of bridge-shaped contact groups. And the two second contact bulges of the drawer seat busbar are inserted into the second clamping openings of the two rows of bridge-shaped contact groups. The two rows of bridge-shaped contacts are respectively and longitudinally connected with the breaker busbar and the drawer seat busbar, longitudinal connection is obviously better than transverse connection in temperature rise and heat dissipation aspects, heat dissipation is more facilitated, meanwhile, the overall contact area is greatly increased through the design, the bridge-shaped contacts can be fully contacted with the breaker busbar and the drawer seat busbar, and the service life of the breaker busbar and the drawer seat busbar is prolonged. The contact resistance is reduced; the current density of a main loop is reduced; the current-carrying capability is improved; the temperature rise is effectively reduced;

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a drawer-type circuit breaker busbar connection structure. Background Art

[0002] A drawer-type circuit breaker is a mechanical switch that can connect, carry and disconnect current under normal circuit conditions, and can also connect, carry for a certain period of time and disconnect current under specified abnormal conditions, to protect the distribution line from overload and short circuit faults. This type of drawer-type circuit breaker consists of two parts: the circuit breaker body and the drawer seat. The circuit breaker body can be shaken in and out of the drawer seat. When the circuit breaker is required to work normally, the circuit breaker body is shaken into the drawer seat so that the busbar of the body contacts the busbar on the drawer seat to achieve electrical connection.

[0003] The bridge contact of the existing drawer-type circuit breaker is an important hub that connects the busbar of the circuit breaker body of the moving part and the busbar of the drawer seat of the stationary part. The bridge contact is composed of multiple sets of conductive sheets installed on both sides of the bracket. The tension provided by the tension spring inside the bridge contact makes the bridge contact closely contact and connect with the busbar of the circuit breaker body and the busbar of the drawer seat. However, the existing bridge contact is usually in point-to-surface contact with the busbar of the body and the busbar of the drawer seat, and the contact effect is not very ideal. The overall contact surface is small and the contact reliability is not high, resulting in high current density in the main circuit, increased temperature rise, decreased current carrying capacity, and affecting the electrical service life of the product. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that the contact surface between the bridge-type contact and the main body busbar and the drawer seat busbar is small, resulting in high current density in the main circuit, increased temperature rise, decreased current carrying capacity, and affecting the electrical service life of the product.

[0005] In order to solve the above problems, the utility model provides a drawer-type circuit breaker busbar connection structure, comprising a circuit breaker busbar, a drawer seat busbar and a contact assembly connecting the circuit breaker busbar and the drawer seat busbar, wherein the contact assembly comprises two rows of bridge-shaped contact groups arranged in parallel along a first direction, the two rows of bridge-shaped contact groups comprise two groups of first clamping openings opening toward one side of the circuit breaker busbar, and two groups of second clamping openings opening toward one side of the drawer seat busbar, the circuit breaker busbar comprises two first contact protrusions inserted into the two groups of first clamping openings, a first bite structure for forming arc surface contact is arranged between the first contact protrusion and the first clamping opening, the drawer seat busbar comprises two second contact protrusions respectively inserted into the two groups of second clamping openings, a second bite structure for forming arc surface contact is arranged between the second contact protrusion and the second clamping opening, the first contact protrusion and the second contact protrusion extend a set length along the first direction, and a rear-connected busbar whose position can be rotated and adjusted according to a certain angle is arranged on the side of the drawer seat busbar facing away from the contact assembly.

[0006] As a preferred embodiment, the first biting structure includes: two first arc grooves arranged on the side walls of the first contact protrusion, and two first biting parts correspondingly arranged on the inner walls of the two sides of the first clamping port and pressed toward each other in the first arc grooves, and the shape of the first biting part is an arc protrusion.

[0007] As a preferred embodiment, the second biting structure includes: two second arc grooves arranged on the side walls of the second contact protrusion, and two second biting parts correspondingly arranged on the inner walls of the second clamping port and pressed toward each other in the second arc grooves, and the shape of the second biting part is an arc protrusion.

[0008] As a preferred solution, each row of the bridge contact group includes four bridge contacts sequentially connected between the first contact protrusion and the second contact protrusion along the first direction, and each bridge contact is respectively provided with a first clamping opening and a second clamping opening connecting the first contact protrusion and the second contact protrusion.

[0009] As a preferred embodiment, each bridge-shaped contact includes a contact bracket, and multiple upper contact pieces and multiple lower contact pieces arranged opposite to each other on the contact bracket, and two elastic pressure plates are provided on the backs of the multiple upper contact pieces and the multiple lower contact pieces on both sides opposite to each other, the two elastic pressure plates are in an arc-shaped structure, and the two ends of the two elastic pressure plates are respectively provided with multiple groups of arc-shaped claw pieces which correspond to and press against the backs of the multiple upper contact pieces and the backs of the multiple lower contact pieces.

[0010] As a preferred embodiment, the first clamping opening and the second clamping opening are formed at both ends of multiple upper contact pieces and multiple lower contact pieces, and the ends opposite to the upper contact pieces and the lower contact pieces are respectively provided with first bite portions, and the other ends opposite to the upper contact pieces and the lower contact pieces are respectively provided with second bite portions.

[0011] As a preferred embodiment, the circuit breaker busbar includes a first U-shaped cavity formed between two first contact protrusions, and the drawer seat busbar includes a second U-shaped cavity formed between two second contact protrusions. The first U-shaped cavity and the second U-shaped cavity are arranged opposite to each other and extend a set length along the first direction respectively, and a portion of the two rows of bridge contact groups are respectively accommodated in the first U-shaped cavity and the second U-shaped cavity.

[0012] As a preferred solution, two rear-connected busbars are vertically arranged on the drawer seat busbars, and the vertical arrangement direction of the rear-connected busbars is parallel to the first direction.

[0013] Or; the rear-connected busbars are arranged horizontally in two on the drawer seat busbars, and the horizontal arrangement direction of the rear-connected busbars is perpendicular to the first direction.

[0014] As a preferred solution, a mounting boss is formed on the side of the drawer seat busbar facing away from the contact assembly, and the rear busbar is fixed on the mounting boss through a connecting plate. Four equidistant fixing holes are arranged in a rectangular shape on the mounting boss, and the connecting plate is correspondingly provided with four connecting holes for fasteners to pass through. The fasteners pass through the connecting plate and are fixed in the fixing holes to achieve a fixed connection between the rear busbar and the drawer seat busbar.

[0015] As a preferred solution, the connection plate is provided with at least two installation slots, and the rear busbar is detachably arranged in the installation slots.

[0016] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0017] 1. In the drawer-type circuit breaker busbar connection structure provided by the utility model, the busbar connection structure is composed of a circuit breaker busbar, a contact assembly, a drawer seat busbar and a rear-connected busbar. The contact assembly includes two rows of bridge-shaped contact groups arranged in parallel along a first direction. Two groups of first clamping openings of the two rows of bridge-shaped contact groups are plugged with two first contact protrusions of the circuit breaker busbar, and two groups of second clamping openings are plugged with two second contact protrusions of the drawer seat busbar. It can be seen that there are four or more surface contacts between them, thereby effectively reducing the problem of product temperature rise. The first contact protrusion and the first clamping opening, and the second contact protrusion and the second clamping opening are respectively connected by the first bite structure and the second bite structure to achieve arc surface contact, and the contact is tighter and more reliable. It has strong tensile strength. The technical solution is based on the first direction as the Y-axis direction of the coordinate system, that is, the two rows of bridge-type contacts are respectively connected to the circuit breaker busbar and the drawer seat busbar in a longitudinal connection. The longitudinal connection is obviously better than the transverse connection in terms of temperature rise and heat dissipation, and is more conducive to heat dissipation. Under the condition of the same connection length, the number of contact pieces per unit length increases. Under the condition of unchanged total electric repulsion, the current value shared by each contact piece and the electric repulsion it bears are reduced. At the same time, this design greatly increases the overall contact area, so that the bridge-type contact can fully contact with the circuit breaker busbar and the drawer seat busbar, with a complete contact line, reducing the contact resistance, thereby reducing the current density of the main circuit, improving the current carrying capacity, effectively reducing the temperature rise, and improving the electrical service life of the product.

[0018] 2. In the drawer-type circuit breaker busbar connection structure provided by the utility model, the circuit breaker busbar and the drawer seat busbar are connected through two rows of bridge-shaped contact groups. Each row of bridge-shaped contact groups includes four bridge-shaped contacts arranged in sequence along a first direction, and each bridge-shaped contact is composed of a number of relative contact pieces. With this structural arrangement, the circuit breaker busbar is connected to a total of eight bridge-shaped contacts through two first contact protrusions. Similarly, the drawer seat busbar is connected to a total of eight bridge-shaped contacts through two second contact protrusions. The two rows of bridge-shaped contact groups designed in this way are longitudinally connected to the circuit breaker busbar and the circuit breaker busbar along the first direction. On the one hand, the contact area can be increased. The entire contact area is more than twice that before the improvement, and the current carrying capacity is stronger. On the other hand, the heat dissipation effect is improved, which is beneficial to reducing the working temperature rise of the product and improving the reliability of the operation of the distribution electrical appliance.

[0019] 3. In the drawer-type circuit breaker busbar connection structure provided by the utility model, the rear busbar is fixed to the mounting boss of the drawer seat busbar through a connecting plate. Four equidistant fixing holes are arranged in a rectangular shape on the mounting boss, and four connecting holes for fasteners to pass through are correspondingly provided on the connecting plate, so that the rear busbar and the connecting plate are fixed to the drawer seat busbar through fasteners. The advantage of such an installation design is that the rear busbar can be rotated 90 degrees from horizontal wiring to vertical wiring, thereby providing convenience for user wiring. A vertical heat dissipation channel is formed between the two rear busbars vertically installed on the drawer seat busbar, which is beneficial to gas convection heat dissipation, improves the heat dissipation effect, and reduces the temperature rise of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art will be briefly introduced below.

[0021] Figure 1 It is a structural schematic diagram of the busbar connection structure of the drawer-type circuit breaker of the utility model;

[0022] Figure 2 It is a structural schematic diagram of another form of the drawer-type circuit breaker busbar connection structure of the utility model;

[0023] Figure 3 It is a schematic diagram of the split structure of the busbar connection structure of the drawer-type circuit breaker of the utility model;

[0024] Figure 4 It is a schematic diagram of the structure of the drawer-type circuit breaker of the utility model, in which the busbar connection structure is hidden and connected to the busbar;

[0025] Figure 5 It is a structural schematic diagram of the bridge-shaped contact of the utility model.

[0026] Explanation of the accompanying drawings: 1. Circuit breaker busbar; 11. First contact protrusion; 12. First U-shaped cavity; 2. Bridge contact; 21. First clamping opening; 22. Second clamping opening; 23. Contact bracket; 24. Upper contact piece; 25. Lower contact piece; 26. Elastic pressure plate; 261. Arc claw piece; 3. Drawer seat busbar; 31. Second contact protrusion; 32. Second U-shaped cavity; 33. Mounting boss; 4. Rear busbar; 5. First bite structure; 51. First arc groove; 52. First bite part; 6. Second bite structure; 61. Second arc groove; 62. Second bite part; 7. Connecting plate; 71. Connecting hole; 72. Mounting slot; 8. Fixing hole; a. Bridge contact group. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Example

[0032] The present embodiment is described in detail below with reference to the accompanying drawings:

[0033] This embodiment provides Figure 1-5A drawer-type circuit breaker busbar connection structure shown in the figure comprises a circuit breaker busbar 1, a drawer seat busbar 3 and a contact assembly connecting the circuit breaker busbar 1 and the drawer seat busbar 3, wherein the contact assembly comprises two rows of bridge-shaped contact groups a arranged in parallel along a first direction, the two rows of bridge-shaped contact groups a comprising two groups of first clamping openings 21 opening toward one side of the circuit breaker busbar 1, and two groups of second clamping openings 22 opening toward one side of the drawer seat busbar 3, the circuit breaker busbar 1 has two first contact protrusions 11 inserted into the two groups of first clamping openings 21, and the first A first bite structure 5 for forming arc surface contact is arranged between the contact protrusion 11 and the first clamping opening 21, the drawer seat busbar 3 has two second contact protrusions 31 respectively inserted into the two groups of second clamping openings 22, a second bite structure 6 for forming arc surface contact is arranged between the second contact protrusion 31 and the second clamping opening 22, the first contact protrusion 11 and the second contact protrusion 31 extend along the first direction for a set length, and a rear busbar 4 that can be rotated and adjusted according to a certain angle is arranged on the side of the drawer seat busbar 3 facing away from the contact assembly. It should be noted that the first direction in this article is the Y-axis direction of the coordinate system, refer to Figure 1 and Figure 2 It can be seen that the two rows of bridge-shaped contact groups a are longitudinally connected and arranged in the first direction, wherein the connection direction in which the circuit breaker busbar, the contact assembly, and the drawer seat busbar are connected in sequence is the Y-axis direction, which is exactly perpendicular to the first direction.

[0034] In the above-mentioned embodiment, the circuit breaker busbar connection structure is composed of a circuit breaker busbar, a contact assembly, a drawer seat busbar and a rear-connected busbar. The contact assembly includes two rows of bridge-shaped contact groups a arranged in parallel along a first direction. The two groups of first clamping openings 21 of the two rows of bridge-shaped contact groups are plugged with two first contact protrusions 11 of the circuit breaker busbar 1, and the two groups of second clamping openings 22 are plugged with two second contact protrusions 31 of the drawer seat busbar 3. It can be seen that there are four or more surface contacts between them, thereby effectively reducing the problem of product temperature rise. The first contact protrusion 11 and the first clamping opening 21, and the second contact protrusion 31 and the second clamping opening 22 are respectively connected by the first bite structure 5 and the second bite structure 6 to achieve arc surface contact, so the contact is tighter and more reliable, and the tensile strength is strong. The technical method of the present invention The solution is to improve and optimize the busbar connection structure in the main circuit of the circuit breaker. According to the first direction being the Y-axis direction of the coordinate system, the two rows of bridge-type contacts are respectively connected longitudinally with the circuit breaker busbar 1 and the drawer seat busbar 3. The longitudinal connection is obviously better than the transverse connection in terms of temperature rise and heat dissipation, and is more conducive to heat dissipation. Under the condition of the same connection length, the number of contact pieces per unit length increases. Under the condition of the total electric repulsion remaining unchanged, the current value shared by each contact piece and the electric repulsion it bears are reduced. At the same time, this design greatly increases the overall contact area, so that the bridge-type contact 2 can fully contact with the circuit breaker busbar 1 and the drawer seat busbar 3, with a complete contact line, reducing the contact resistance, thereby reducing the current density of the main circuit, improving the current carrying capacity, effectively reducing the temperature rise, and improving the electrical service life of the product.

[0035] Combine the following Figure 3-5 The specific configuration of the first bite structure and the second bite structure is described in detail:

[0036] The first biting structure 5 includes: two first arc grooves 51 arranged on the side walls of both sides of the first contact protrusion 11, and two first biting parts 52 correspondingly arranged on the inner walls of both sides of the first clamping port 21 and pressed against each other in the first arc grooves 51. The first biting part 52 is shaped like an arc protrusion. It can be seen that the first contact protrusion 11 is in close contact with the two first arc grooves 51 in the first clamping port 21 through the two first biting parts 52, that is, each bridge-shaped contact 2 has two arc contact surfaces with a contact protrusion, thereby increasing the contact area and reducing the temperature rise of the product. Correspondingly, the second engagement structure 6 includes: two second arc grooves 61 arranged on the side walls of the second contact protrusion 31, and two second engagement parts 62 correspondingly arranged on the inner walls of the second clamping opening 22 and pressed against the second arc grooves 61. The second engagement parts 62 are in the shape of arc protrusions. It can be seen that the second contact protrusion 31 is in close contact with the two second arc grooves 61 in the second clamping opening 22 through the two second engagement parts 62, that is, each bridge contact 2 has two arc contact surfaces with the second contact protrusion 31, thereby increasing the contact area and reducing the temperature rise of the product. Through the above-mentioned structural setting, the first contact protrusion 11 forms a limit fit with the first clamping opening 21 by using the first engagement structure 5, and the second contact protrusion 31 forms a limit fit with the second clamping opening 22 by using the second engagement structure 6, which not only increases the contact area, but also prevents the occurrence of loosening, thereby ensuring the tightness and reliability of the bridge contact group and the installation contact with the circuit breaker busbar and the drawer seat busbar.

[0037] In this embodiment, each row of the bridge contact group a includes four bridge contacts 2 connected in sequence between the first contact protrusion 11 and the second contact protrusion 31 along the first direction, and a gap of 2 mm is left between adjacent bridge contacts 2 to increase the heat dissipation area, wherein each bridge contact 2 is respectively provided with a first clamping opening 21 and a second clamping opening 22 connecting the first contact protrusion 11 and the second contact protrusion 31. As a specific structural arrangement, each bridge contact 2 includes a contact bracket 23, and a plurality of upper contact pieces 24 and a plurality of lower contact pieces 25 arranged opposite to each other on the contact bracket 23, and two elastic pressure plates 26 are provided on the backs of the plurality of upper contact pieces 24 and the plurality of lower contact pieces 25 on both sides opposite to each other, the two elastic pressure plates 26 are in an arc-shaped structure, and the two ends of the two elastic pressure plates 26 are respectively provided with a one-to-one corresponding pressing against the backs of the plurality of upper contact pieces 24 and the backs of the plurality of lower contact pieces. A plurality of groups of arc-shaped claw pieces 261 apply contact pressure to the plurality of upper and lower contact pieces 25 through the elastic pressure plate 26 to squeeze the first contact protrusion 11 and the second contact protrusion 31 toward each other, so that the bridge contact 2 maintains close contact with the first contact protrusion 11 and the second contact protrusion 31 respectively. With this structural arrangement, the circuit breaker busbar 1 is connected to a total of eight bridge contacts 2 through two first contact protrusions 11, and correspondingly, the drawer seat busbar 3 is connected to a total of eight bridge contacts 2 through two second contact protrusions 31. The two rows of bridge contact groups a designed in this way are longitudinally connected to the circuit breaker busbar 1 and the drawer seat busbar 2 along the first direction. On the one hand, the contact area can be increased, and the entire contact area is more than twice that before the improvement, and the current carrying capacity is stronger. On the other hand, the heat dissipation effect is improved, which is beneficial to reducing the operating temperature rise of the product and improving the reliability of the operation of the distribution electrical appliance.

[0038] It is further preferred that the first clamping opening 21 and the second clamping opening 22 are formed at both ends of a plurality of upper contact pieces 24 and a plurality of lower contact pieces 25, and the ends of the upper contact pieces 24 and the lower contact pieces 25 opposite to each other are respectively provided with a first bite portion 52, and the other ends of the upper contact pieces 24 and the lower contact pieces 25 opposite to each other are respectively provided with a second bite portion 62, and the first bite portion 52 and the second bite portion 62 are respectively arc convex structures, such a design can increase the contact surface between the contact piece and the circuit breaker busbar 1 and the drawer seat busbar 3, forming a complete contact line, thereby reducing the current density of the main circuit and effectively reducing the temperature rise. In this embodiment, the circuit breaker busbar 1 and the drawer seat busbar 3 are respectively connected in a longitudinal arrangement according to two rows of bridge-type contacts, and the corresponding circuit breaker busbar 1 and the drawer seat busbar 3 are also arranged longitudinally, such as Figure 3As shown, the circuit breaker busbar 1 includes a first U-shaped cavity 12 formed between two first contact protrusions 11, and the drawer seat busbar 3 includes a second U-shaped cavity 32 formed between two second contact protrusions 31. A portion of the two rows of bridge contact groups a are respectively accommodated in the first U-shaped cavity 12 and the second U-shaped cavity 32. The first U-shaped cavity 12 and the second U-shaped cavity 32 are relatively arranged and extend a set length along the first direction respectively, that is, the first U-shaped cavity and the second U-shaped cavity are vertically arranged, which is conducive to the circulation and heat dissipation of hot air in the vertical direction, and the heat dissipation effect is better, thereby reducing the temperature rise between the busbars.

[0039] Combine the following Figure 1-3 The specific setting method of the rear-connected busbar is described in detail:

[0040] refer to Figure 1 The rear busbars 4 are arranged vertically on the drawer seat busbars 3, and the vertical arrangement direction of the rear busbars 4 is parallel to the first direction. The rear busbars 4 arranged in this way can be used to meet the user's vertical wiring needs; of course, there are other ways to arrange the rear busbars 4, refer to Figure 2 The rear busbars 4 are arranged horizontally in two on the drawer seat busbars 3, and the horizontal arrangement direction of the rear busbars 4 is perpendicular to the first direction. The rear busbars 4 arranged in this way can be used to meet the user's horizontal wiring requirements.

[0041] As a specific structural setting, refer to Figure 3 A mounting boss 33 is formed on the side of the drawer seat busbar 3 facing away from the contact assembly, and the rear busbar 4 is fixed on the mounting boss 33 through a connecting plate 7, and the connecting plate 7 is provided with at least two mounting slots 72, and the rear busbar 4 is detachably arranged in the mounting slots 72, wherein four equidistant fixing holes 8 are arranged in a rectangular shape on the mounting boss 33, and the connecting plate 7 is correspondingly provided with four connecting holes 71 for fasteners to pass through, and the fasteners are passed through the connecting plate 7 and fixed in the fixing holes 8 to realize the fixed connection between the rear busbar 4 and the drawer seat busbar 3, and the fasteners are preferably screws. The advantage of such an installation design is that the rear busbar 4 can be rotated 90 degrees from horizontal wiring to vertical wiring, thereby providing convenience for user wiring, and a vertical heat dissipation channel will be formed between the two rear busbars 4 vertically installed on the drawer seat busbar 3, which is conducive to gas convection heat dissipation, improves the heat dissipation effect, and reduces the temperature rise of the product.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A drawer-type circuit breaker busbar connection structure, comprising a circuit breaker busbar (1), a drawer seat busbar (3), and a contact assembly connecting the circuit breaker busbar (1) and the drawer seat busbar (3), characterized in that: The contact assembly comprises two rows of bridge-shaped contact groups (a) arranged in parallel along a first direction, the two rows of bridge-shaped contact groups (a) comprising two groups of first clamping openings (21) opening toward one side of the circuit breaker busbar (1), and two groups of second clamping openings (22) opening toward one side of the drawer seat busbar (3), the circuit breaker busbar (1) having two first contact protrusions (11) inserted into the two groups of first clamping openings (21), a first contact protrusion (11) forming an arc surface contact is arranged between the first contact protrusion (11) and the first clamping opening (21) The drawer seat busbar (3) comprises two second contact protrusions (31) respectively inserted into two groups of second clamping openings (22); a second bite structure (6) for forming arc surface contact is arranged between the second contact protrusions (31) and the second clamping openings (22); the first contact protrusions (11) and the second contact protrusions (31) extend along a first direction for a set length; and a rear busbar (4) which can be rotated and adjusted according to a certain angle is arranged on a side of the drawer seat busbar (3) facing away from the contact assembly.

2. According to the drawer type circuit breaker busbar connection structure of claim 1, it is characterized in that: The first engaging structure (5) comprises: two first arc grooves (51) arranged on the side walls of the first contact protrusion (11), and two first engaging portions (52) correspondingly arranged on the inner walls of the two sides of the first clamping opening (21) and pressed against the first arc grooves (51), wherein the first engaging portions (52) are shaped like arc protrusions.

3. According to the drawer type circuit breaker busbar connection structure of claim 1, it is characterized in that: The second biting structure (6) comprises: two second arc grooves (61) arranged on the side walls of the second contact protrusion (31), and two second biting parts (62) correspondingly arranged on the inner walls of the second clamping opening (22) and pressed against the second arc grooves (61), wherein the second biting parts (62) are in the shape of arc protrusions.

4. The drawer-type circuit breaker busbar connection structure according to any one of claims 1 to 3, characterized in that: Each row of the bridge contact group (a) comprises four bridge contacts (2) connected between a first contact protrusion (11) and a second contact protrusion (31) along a first direction, and each bridge contact (2) is provided with a first clamping opening (21) and a second clamping opening (22) for connecting the first contact protrusion (11) and the second contact protrusion (31).

5. The drawer-type circuit breaker busbar connection structure according to claim 4, characterized in that: Each bridge contact (2) comprises a contact support (23), and a plurality of upper contact pieces (24) and a plurality of lower contact pieces (25) arranged opposite to each other on the contact support (23), and two elastic pressure plates (26) are arranged on the backs of the plurality of upper contact pieces (24) and the plurality of lower contact pieces (25) on both sides opposite to each other, the two elastic pressure plates (26) are in an arc-shaped structure, and a plurality of groups of arc-shaped claw pieces (261) are respectively arranged at both ends of the two elastic pressure plates (26) and pressed against the backs of the plurality of upper contact pieces (24) and the backs of the plurality of lower contact pieces in a one-to-one manner.

6. The drawer-type circuit breaker busbar connection structure according to claim 5, characterized in that: The first clamping opening (21) and the second clamping opening (22) are arranged at both ends of a plurality of upper contact pieces (24) and a plurality of lower contact pieces (25); a first bite portion (52) is respectively provided at one end of the upper contact piece (24) opposite to the lower contact piece (25); and a second bite portion (62) is respectively provided at the other end of the upper contact piece (24) opposite to the lower contact piece (25).

7. The drawer type circuit breaker busbar connection structure according to claim 1, characterized in that: The circuit breaker busbar (1) comprises a first U-shaped cavity (12) formed between two first contact protrusions (11), and the drawer seat busbar (3) comprises a second U-shaped cavity (32) formed between two second contact protrusions (31), the first U-shaped cavity (12) and the second U-shaped cavity (32) being arranged opposite to each other and extending along a first direction by a set length respectively, and a portion of the two rows of bridge contact groups (a) are respectively accommodated in the first U-shaped cavity (12) and the second U-shaped cavity (32).

8. The drawer-type circuit breaker busbar connection structure according to claim 7, characterized in that: Two rear-connected busbars (4) are arranged vertically on the drawer seat busbar (3), and the vertical arrangement direction of the rear-connected busbars (4) is parallel to the first direction; Or; the rear busbars (4) are arranged horizontally in two on the drawer seat busbar (3), and the horizontal arrangement direction of the rear busbars (4) is perpendicular to the first direction.

9. The drawer-type circuit breaker busbar connection structure according to claim 8, characterized in that: A mounting boss (33) is formed on the side of the drawer seat busbar (3) facing away from the contact assembly, and the rear-connected busbar (4) is fixed to the mounting boss (33) via a connecting plate (7). Four equidistant fixing holes (8) are arranged in a rectangular shape on the mounting boss (33), and the connecting plate (7) is correspondingly provided with four connecting holes (71) for fasteners to pass through. The fasteners pass through the connecting plate (7) and are fixed in the fixing holes (8) to achieve fixed connection between the rear-connected busbar (4) and the drawer seat busbar (3).

10. The drawer type circuit breaker busbar connection structure according to claim 9, characterized in that: The connection plate (7) is provided with at least two installation slots (72), and the rear busbar (4) is detachably arranged in the installation slots (72).

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