Frame circuit breaker capable of controlling temperature rise

Abstract

The utility model discloses a frame circuit breaker capable of controlling temperature rise, which comprises a frame circuit breaker body, a support frame, a heat conduction block, an air inlet fan and an exhaust fan, and is characterized in that a plurality of current-carrying busbars are respectively arranged at the upper part and the lower part of a back plate of the frame circuit breaker body; the support frame is provided with a concave cavity for accommodating the heat conduction blocks, the heat conduction blocks respectively abut against the two sides and the bottom of the current-carrying busbar, the two sides and the bottom of each heat conduction block are respectively provided with a plurality of heat dissipation fins at equal intervals, and the bottom of the concave cavity is provided with a plurality of air inlet holes which are located at inlets of the heat dissipation fins. The air flow speed in the heat dissipation fins is accelerated through the air inlet fan and the exhaust fan, cooling air can generate a siphonic effect after passing through the air inlet holes, the suction amount of external air is increased, the cooling air enters the heat dissipation fins at the bottom and on the two sides of the heat conduction block respectively, the heat exchange area is increased, and the heat dissipation efficiency is improved. And the product has the advantage of controlling the temperature rise of the current-carrying busbar.

Description

Technical Field

[0001] The utility model relates to the technical field of dry-type transformers, in particular to a frame circuit breaker for controlling temperature rise. Background Art

[0002] The frame circuit breaker is mainly used for distributing electric energy and protecting circuits, power sources and electrical equipment from the hazards of overload, undervoltage, short circuit, leakage, grounding and other faults. Among them, the drawer base is an important part of the frame circuit breaker, and the main body busbar and the drawer base busbar are both connected to the drawer base and form a set of conductive systems.

[0003] With the development of miniaturization and intellectualization of low-voltage distribution cabinets, the overall volume of the distribution cabinet is getting smaller and smaller, and the density of small frame circuit breakers is getting higher and higher. Therefore, the low-voltage switchgear factory puts forward higher requirements for the temperature rise at the outlet end of the frame circuit breaker, and it is necessary to meet the requirement that the frame circuit breaker does not derate in high-temperature environments. Therefore, the applicant has made a beneficial design and found a solution to the above problems. The technical solution to be introduced below was generated under this background. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the traditional frame circuit breaker design, and provide a product with the function of controlling the temperature rise of the current-carrying busbar.

[0005] To solve the above problems, the utility model adopts the following technical solutions.

[0006] A frame circuit breaker for controlling temperature rise includes a frame circuit breaker body. A plurality of current-carrying busbars are respectively arranged at the upper and lower parts of the back plate of the frame circuit breaker body. It also includes a support frame, a heat conduction block, an intake fan and an exhaust fan. The support frame is provided with a concave cavity for accommodating the heat conduction block. The heat conduction block abuts against both sides and the bottom of the current-carrying busbar respectively. A plurality of equally spaced heat dissipation fins are arranged on both sides and the bottom of the heat conduction block. A plurality of air inlet holes are arranged at the bottom of the concave cavity and are located at the entrance of the heat dissipation fins. A plurality of ventilation holes are arranged on both sides of the concave cavity and are located at the entrance of the heat dissipation fins. The intake fan is fixedly installed on one side of the support frame and is arranged at the entrance of the ventilation holes. The exhaust fan is fixedly installed on the other side of the support frame and is arranged at the exit of the ventilation holes.

[0007] Preferably, the current-carrying busbar is provided with mounting holes.

[0008] Preferably, the heat conduction block is provided with through holes corresponding to the mounting holes.

[0009] Preferably, the two sides of the support frame are provided with avoidance grooves, and an arc isolation plate is arranged between the concave cavities.

[0010] Preferably, the intake fan and the exhaust fan are installed and fixed in the avoidance groove.

[0011] Preferably, a thermal grease is provided between the heat conducting block and the current-carrying bus bar.

[0012] Beneficial effects:

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] In the present utility model, since the ventilation holes are on the same axis line and are located at the inlet of the heat dissipation fins, the intake fan sucks the external cooling air into the space between the heat dissipation fins at the bottom of the heat conducting block through suction, and heat exchange occurs with the heat dissipation fins. Then, the exhaust fan discharges the air that has undergone heat exchange between the heat dissipation fins at the bottom of the heat conducting block to the outside, playing a role in relaying the intake fan, thereby accelerating the air flow speed between the heat dissipation fins. Moreover, when the cooling air passes through the air inlet holes, a siphon effect will occur, continuously sucking the external air into the space between the heat dissipation fins. Part of the cooling air continues to flow through the ventilation holes, and the remaining cooling air will enter the heat dissipation fins on both sides of the heat conducting block and exchange heat with them. Through the above structural design, not only the contact area between the heat conducting block and the current-carrying bus bar is increased, but also the temperature rise of the current-carrying bus bar is effectively controlled. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a frame circuit breaker for controlling temperature rise according to the present utility model;

[0016] Figure 2 It is an exploded view of a frame circuit breaker for controlling temperature rise according to the present utility model;

[0017] The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0018] Reference numerals: 1, frame circuit breaker body; 2, current-carrying bus bar; 3, support frame; 4, heat conducting block; 5, intake fan; 6, exhaust fan; 7, arc isolation plate; 21, mounting hole; 31, cavity; 32, air inlet hole; 33, ventilation hole; 34, avoidance groove; 41, heat dissipation fin; 42, through hole. Detailed Embodiments

[0019] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0021] In the embodiments of the present utility model, "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0022] Reference example Figure 1 , Figure 2 , a frame circuit breaker for controlling temperature rise, includes a frame circuit breaker body 1. A plurality of current-carrying busbars 2 are respectively arranged at the upper and lower parts of the back plate of the frame circuit breaker body 1. It also includes a support frame 3, a heat-conducting block 4, an intake fan 5, and an exhaust fan 6. The support frame 3 is provided with a cavity 31 for accommodating the heat-conducting block 4. The heat-conducting block 4 abuts against both sides and the bottom of the current-carrying busbar 2 respectively. A plurality of equally spaced heat dissipation fins 41 are provided on both sides and the bottom of the heat-conducting block 4. A plurality of air inlet holes 32 are provided at the bottom of the cavity 31 and are located at the entrance of the heat dissipation fins 41. A plurality of ventilation holes 33 are provided on both sides of the cavity 31 and are located at the entrance of the heat dissipation fins 41. The intake fan 5 is fixedly installed on one side of the support frame 3, and the intake fan 5 is arranged at the entrance of the ventilation holes 33. The exhaust fan 6 is fixedly installed on the other side of the support frame 3, and the exhaust fan 6 is arranged at the exit of the ventilation holes 33. The ventilation holes 33 of this design are on the same axis and are located at the entrance of the heat dissipation fins 41. The intake fan 5 sucks the external cooling air into the space between the heat dissipation fins 41 at the bottom of the heat-conducting block 4 and generates heat exchange with the heat dissipation fins 41. The exhaust fan 6 discharges the air after heat exchange between the heat dissipation fins 41 at the bottom of the heat-conducting block 4 to the outside, playing the role of relaying the intake fan 5, thereby accelerating the air flow speed between the heat dissipation fins 41. And when the cooling air passes through the air inlet holes 32, a siphon effect will occur, continuously sucking the external air into the space between the heat dissipation fins 41. Part of the cooling air continues to flow through the ventilation holes 33, and the remaining cooling air will enter the heat dissipation fins 41 on both sides of the heat-conducting block 4 and generate heat exchange with them. Through the above structural design, not only the contact area between the heat-conducting block 4 and the current-carrying busbar 2 is increased, but also the temperature rise of the current-carrying busbar 2 is effectively controlled;

[0023] It is worth mentioning that the current-carrying busbar 2 is provided with mounting holes 21, and the mounting holes 21 facilitate the electrical connection between the current-carrying busbar 2 and the busbar copper.

[0024] It is worth mentioning that the heat conducting block 4 is provided with a through hole 42 corresponding to the mounting hole 21, and the through hole 42 is used in cooperation with the mounting hole 21;

[0025] It is worth mentioning that the two sides of the support frame 3 are provided with avoidance grooves 34, and an arc separating plate 7 is arranged between the concave cavities 31. The avoidance grooves 34 make the intake fan 5 and the exhaust fan 6 flush with the two sides of the support frame 3. The arc separating plate 7 increases the arc creepage distance generated between the current-carrying busbars 2 during the instant of breaking, thereby improving the safety of the product;

[0026] It is worth mentioning that the intake fan 5 and the exhaust fan 6 are installed and fixed in the avoidance grooves 34;

[0027] It is worth mentioning that a thermal grease is provided between the heat conducting block 4 and the current-carrying busbar 2. The thermal grease reduces the gap between the heat conducting block 4 and the current-carrying busbar 2 and improves the efficiency of heat transfer.

[0028] Through the above design scheme, the product can achieve the advantage of controlling the temperature rise of the current-carrying busbar.

[0029] The above content further elaborates on the present invention in combination with specific embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as falling within the protection scope determined by the claims submitted for the present invention.

Claims

1. A frame circuit breaker for controlling temperature rise, comprising a frame circuit breaker body (1), and a plurality of current-carrying busbars (2) are respectively arranged at the upper and lower parts of the back plate of the frame circuit breaker body (1), and it is characterized in that: It further includes a support frame (3), a heat conducting block (4), an intake fan (5), and an exhaust fan (6). The support frame (3) is provided with a concave cavity (31) for accommodating the heat conducting block (4). The heat conducting block (4) abuts against both sides and the bottom of the current-carrying busbar (2). A plurality of equally spaced heat dissipation fins (41) are provided on both sides and the bottom of the heat conducting block (4). A plurality of air inlet holes (32) are provided at the bottom of the concave cavity (31) and are located at the entrances of the heat dissipation fins (41). A plurality of ventilation holes (33) are provided on both sides of the concave cavity (31) and are located at the entrances of the heat dissipation fins (41). The intake fan (5) is fixedly installed on one side of the support frame (3), and the intake fan (5) is arranged at the entrance of the ventilation hole (33). The exhaust fan (6) is fixedly installed on the other side of the support frame (3), and the exhaust fan (6) is arranged at the exit of the ventilation hole (33).

2. The frame circuit breaker for controlling temperature rise according to claim 1, wherein: The current-carrying busbar (2) is provided with mounting holes (21).

3. The frame circuit breaker for controlling temperature rise according to claim 2, wherein: The heat conducting block (4) is provided with through holes (42) corresponding to the mounting holes (21).

4. The frame circuit breaker for controlling temperature rise according to claim 1, characterized in that: Avoidance grooves (34) are provided on both sides of the support frame (3), and an arc separation plate (7) is provided between the concave cavities (31).

5. The frame circuit breaker for controlling temperature rise according to claim 4, characterized in that: The intake fan (5) and the exhaust fan (6) are fixedly installed in the avoidance grooves (34).

6. The frame circuit breaker for controlling temperature rise according to any one of claims 2 to 5, characterized in that: A heat conducting silicone grease is provided between the heat conducting block (4) and the current-carrying busbar (2).

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