Novel enclosed bus structure for cable branch box
By designing a new closed bus structure for cable branch boxes, including main bus bars, connecting copper bars and insulating guards, the problem of increased internal resistance and poor heat dissipation in the connection between the circuit breaker and the bus bars in the prior art is solved, and the problem of poor internal resistance and heat dissipation in the connection between the circuit breaker and the bus bars is achieved. It reduces heat generation and improves heat dissipation effect.
Patent Information
- Application Number
- CN202420368210.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-02-28
AI Technical Summary
In the existing cable branch box, the connection structure between the circuit breaker and the busbar increases internal resistance, resulting in an increase in heat generation and poor heat dissipation effect, which is prone to heat accumulation and temperature rise.
A new closed bus structure was designed, including the main bus bar, connecting copper bar and insulated guard plate. The circuit breaker is directly connected to the main bus bar by connecting copper bar, canceling the adapter part and adding an insulated guard plate to reduce electric shock. and optimize the arrangement of components to improve heat dissipation.
This structure reduces heating problems, improves heat dissipation effect, meets the temperature rise requirements of the cable branch box, and achieves safe and reliable connections.
Smart Images
Figure CN222484232U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of circuit breaker equipment, in particular to a novel closed busbar structure for a cable branch box. Background Art
[0002] At present, in the cable branch box, the rear terminal of the circuit breaker adopts the busbar hanging technology without punching holes. The circuit breaker is hung on the front of the busbar without punching holes through a special adapter. Compared with the traditional circuit breaker directly connected to the main busbar through a copper busbar, an additional busbar overlap position is added, which increases the internal resistance of the branch box and leads to increased heat generation. Figure 2 shown.
[0003] Specifically, the adapter and the main busbar are tightened by hooks. Compared with the traditional bolt fastening method, the specifications of the copper busbar in the adapter are limited, the contact area becomes smaller, and the force is uneven, which is prone to poor contact and large contact resistance, further increasing the heat generated by the branch box. In this structural form, the main busbar is insulated and closed, the adapter is installed on the surface of the main busbar, and the circuit breaker is installed on the surface of the adapter. Multiple components need to be stacked on the same horizontal plane, which limits the position and will cause the heat generated by each component to not be effectively dissipated, resulting in heat accumulation and increased temperature rise. Utility Model Content
[0004] In order to solve the above problems, the utility model provides a new closed busbar structure for a cable branch box, which has the characteristics of simple structural design, safety, reliability and good heat dissipation effect.
[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is:
[0006] A new closed busbar structure for a cable branch box comprises a main busbar, a connecting copper bar and an insulating shield. The main busbar is arranged directly above a circuit breaker and arranged in three phases front and back. The main busbar is fixedly connected to the inner side of the insulating shield through an insulator support. The insulating shield comprises an upper shield and a lower shield. The upper shield is fixedly connected to a box body. The insulator support is fixedly arranged on the inner side of the upper shield. The upper end of the connecting copper bar is fixedly connected to the main busbar through bolts, and the lower end thereof is connected to the incoming line terminal of the circuit breaker. The lower end of the upper shield is fixedly connected to the upper end of a front panel of a circuit breaker housing, and the upper end of the lower shield is fixedly connected to the lower end of the front panel of the circuit breaker through bolts.
[0007] Furthermore, the connecting copper bars are bent plates that are bent twice, the upper ends of the connecting copper bars are parallel to each other, and the lower ends are fixedly connected to the circuit breaker terminals.
[0008] Furthermore, the upper guard plate includes an integrally connected top plate, a front panel, and a bent plate. The top plate is arranged above the main busbar, and the front panel protrudes forward and is positioned further forward than the circuit breaker to ensure the heat dissipation space of the main busbar. The lower end of the bent plate is flush with the front panel of the circuit breaker housing and is fixedly connected to the upper end of the circuit breaker housing by bolts.
[0009] The beneficial effects of the utility model are as follows: based on the structure of the traditional closed busbar, the device is improved in structure, the adapter part is eliminated, and the circuit breaker is directly connected to the main busbar above by connecting the copper busbar. There is no restriction on the adapter structure, and the specifications of the main busbar and the branch copper busbar can be appropriately increased to increase the current carrying capacity; the circuit breaker and the main busbar are arranged up and down, which is conducive to heat dissipation; insulating guard plates are added to the upper and lower copper busbars of the main busbar and the circuit breaker to reduce the risk of electric shock. The structure can realize various functions of the original closed busbar system, ensure the heat dissipation effect, avoid heat problems, and meet the temperature rise requirements of the cable branch box. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model.
[0011] Figure 2 This is a schematic diagram of the traditional circuit breaker connection structure.
[0012] 1-main busbar, 2-connecting copper bar, 3-insulator support, 4-circuit breaker, 5-lower guard plate, 6-top plate, 7-front panel, 8-bent plate. DETAILED DESCRIPTION
[0013] The utility model is further described below in conjunction with the accompanying drawings:
[0014] like Figure 1 A new type of closed busbar structure for a cable branch box is shown, which includes a main busbar, a connecting copper bar, and an insulating guard plate. The main busbar 1 is arranged directly above the circuit breaker 4, and the three phases are arranged front and back and fixed inside the cable branch box. The main busbar is fixedly connected to the inner side of the insulating guard plate through an insulator support 3. The insulating guard plate includes an upper guard plate and a lower guard plate 5. The upper guard plate is fixedly connected to the box body, and the insulator support 3 is fixedly arranged on the inner side of the upper guard plate. The upper end of the connecting copper bar 2 is fixedly connected to the main busbar 1 by bolts, and the lower end thereof is connected to the incoming line terminal of the circuit breaker 4. The lower end of the upper guard plate is fixedly connected to the upper end of the front panel of the circuit breaker 4 shell, and the upper end of the lower guard plate is fixedly connected to the lower end of the front panel of the circuit breaker by bolts.
[0015] The circuit breaker housing is provided with threaded connection holes to facilitate fixing with the ends of the upper and lower guard plates.
[0016] Furthermore, the connecting copper bars 2 are all bent plates twice. Because the three-phase main busbars are spaced front and back, the bending angles of the three connecting copper bars are also different. The upper ends of the three connecting copper bars are parallel to each other, and the lower ends are fixedly connected to the circuit breaker terminals.
[0017] Furthermore, the upper guard plate includes an integrally connected top plate 6, a front panel 7, and a bent plate 8. The top plate is arranged above the main busbar 1, and the front panel protrudes forward and is positioned further forward than the circuit breaker to ensure the heat dissipation space of the main busbar in the upper guard plate. The lower end of the bent plate 8 is flush with the front panel of the circuit breaker housing and is fixedly connected to the upper end of the circuit breaker housing by bolts.
[0018] Based on the structure of the traditional closed busbar, this device has made structural improvements, eliminated the adapter part, and reduced the cost. The circuit breaker is directly connected to the main busbar above through the connecting copper busbar. There is no restriction on the adapter structure, and the specifications of the main busbar and branch copper busbar can be appropriately increased to increase the current carrying capacity; the circuit breaker and the main busbar are arranged up and down to facilitate heat dissipation; insulating protective plates are added to the upper and lower copper busbars of the main busbar and the circuit breaker to reduce the risk of electric shock. This structure can realize various functions of the original closed busbar system, ensure the heat dissipation effect, avoid heating problems, and meet the temperature rise requirements of the cable branch box.
[0019] The above is only a preferred embodiment of the present utility model. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present utility model without paying creative labor.
Claims
1. A new closed busbar structure for a cable branch box, characterized in that: It includes a main busbar, a connecting copper bar, and an insulating protective plate. The main busbar is arranged directly above the circuit breaker, and the three phases are arranged front and back. The main busbar is fixedly connected to the inner side of the insulating protective plate through an insulator support. The insulating protective plate includes an upper protective plate and a lower protective plate. The upper protective plate is fixedly connected to the box body, and the insulator support is fixedly arranged on the inner side of the upper protective plate. The upper end of the connecting copper bar is fixedly connected to the main busbar through bolts, and the lower end thereof is connected to the inlet terminal of the circuit breaker. The lower end of the upper protective plate is fixedly connected to the upper end of the front panel of the circuit breaker housing, and the upper end of the lower protective plate is fixedly connected to the lower end of the front panel of the circuit breaker through bolts.
2. The new closed busbar structure for a cable branch box according to claim 1 is characterized in that: The connecting copper bars are all bent plates that are bent twice, the upper ends of the connecting copper bars are parallel to each other, and the lower ends are fixedly connected to the wiring terminals of the circuit breaker.
3. The new closed busbar structure for a cable branch box according to claim 1 is characterized in that: The upper guard plate includes an integrally connected top plate, a front panel, and a bent plate. The top plate is arranged above the main busbar, the front panel protrudes forward, the lower end of the bent plate is flush with the front panel of the circuit breaker housing, and is fixedly connected to the upper end of the circuit breaker housing by bolts.