Molded case circuit breaker

Abstract

The utility model provides a molded case circuit breaker, which comprises circuit breaker shells, the circuit breaker shells are combined together in an attached manner, and a contact mechanism, a free tripping mechanism, an arc extinguishing mechanism and a tripping unit are integrated in the circuit breaker shells. Compared with the prior art, the circuit breaker has the advantages that the connecting plate, the first radiating fins and the second radiating fins are all made of insulating and heat-conducting aluminum oxide ceramic materials, heat of the circuit breaker can be effectively conducted away, the radiating area of the circuit breaker is effectively increased, the radiating effect of the circuit breaker is improved, and in the working environment, the fan is designed to be located below the side of the circuit breaker, so that the service life of the circuit breaker is prolonged. The flow dividing connector connected with the output end of the fan evenly distributes airflow into the heat dissipation pipes, the heat dissipation pipes are connected with the second heat dissipation fins in a penetrating mode, and an efficient heat dissipation channel is formed. According to the design, heat can be taken away by high-speed airflow through the radiating fins and the radiating pipes more quickly, so that the temperature of the molded case circuit breaker is effectively reduced, and the stability of the molded case circuit breaker is improved by reducing the temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a molded case circuit breaker. Background Art

[0002] A molded case circuit breaker is a kind of electric power protection equipment, which has two-stage protection functions of overload long-time delay and short-circuit instantaneous tripping. It can automatically cut off the circuit after the current exceeds the tripping setting to protect electrical equipment and personal safety. The outer shell is made of plastic material, which has the characteristics of fire prevention, moisture prevention, shock prevention, etc., so it has good safety performance. It has a small volume, a simple structure, is convenient to install and easy to maintain. It is suitable for small circuits and well meets the protection requirements of small electrical equipment.

[0003] However, when the molded case circuit breaker is in use, it also has certain defects. Since its outer shell is made of plastic material, heat is likely to accumulate inside, and it has the disadvantage of poor heat dissipation performance. It is easily damaged by factors such as overload, short circuit, overvoltage, undervoltage and harsh use environment. Summary of the Utility Model

[0004] The purpose of the utility model aims to solve at least one of the above technical defects.

[0005] Therefore, an object of the utility model is to provide a molded case circuit breaker to solve the problems mentioned in the background art and overcome the deficiencies existing in the prior art.

[0006] To achieve the above object, an embodiment of one aspect of the utility model provides a molded case circuit breaker, including a circuit breaker housing, the circuit breaker housings are combined together by being abutted against each other, and a contact mechanism, a free tripping mechanism, an arc extinguishing mechanism, and a tripping unit are integrated inside the circuit breaker housing;

[0007] A handle is movably connected to the front surface of the circuit breaker housing, and the handle is connected to the contact mechanism inside the circuit breaker housing;

[0008] A connection plate is fixedly connected to the side surface of the circuit breaker housing, and a plurality of first heat sinks are fixedly connected to one side of the connection plate;

[0009] A plurality of second heat sinks are fixedly connected to the bottom of the circuit breaker housing;

[0010] A heat dissipation pipe is inserted through all the second heat sinks, a flow dividing joint is fixedly connected to the end of the heat dissipation pipe, and a fan is fixedly connected to one side of the flow dividing joint.

[0011] Preferably, according to any of the above solutions, the material of the circuit breaker housing is plastic, and the connection plate is bonded to the circuit breaker housing.

[0012] Adopting the above technical solution: The working principle of this molded case circuit breaker is that its main contacts are manually operated. After the main contacts are closed, the free tripping mechanism locks the main contacts in the closed position. When a short circuit or severe overload occurs in the circuit, the armature of the tripping unit is attracted, causing the free tripping mechanism to act and the main contacts to disconnect the main circuit. When the circuit is overloaded, the heating element of the thermal release heats up, causing the bimetal to bend upwards, pushing the free tripping mechanism to act and the main contacts to disconnect the main circuit. When the circuit is under-voltage, the armature of the under-voltage release is released, also causing the free tripping mechanism to act and the main contacts to disconnect the main circuit, which is well-known content in the prior art.

[0013] Preferably, according to any of the above solutions, the materials of the connection plate, the first heat sink, and the second heat sink are all alumina ceramics. The first heat sink is bonded to the connection plate, and the first heat sink is perpendicular to the surface of the connection plate.

[0014] Adopting the above technical solution: The core structure of this device is: a connection plate, a first heat sink, a second heat sink, a heat dissipation pipe, a shunt joint, and a fan. Among them, the connection plate, the first heat sink, the second heat sink, the heat dissipation pipe, and the shunt joint are all made of alumina ceramics, with good insulation and heat conduction properties. The fan is connected to the mains electricity and is a small-power small fan.

[0015] Preferably, according to any of the above solutions, the second heat sinks are parallel to each other, and the root of the heat dissipation pipe is connected to the shunt joint.

[0016] Adopting the above technical solution: The core advantage of this device is: the design of the connection plate, the first heat sink, and the second heat sink, all of which are made of insulating and heat-conducting alumina ceramics, can effectively conduct away the heat of the circuit breaker, effectively increasing its heat dissipation area to improve the heat dissipation effect of the circuit breaker. In the working environment, a fan is designed and located below the side of the circuit breaker. The shunt joint connected to the output end of the fan evenly distributes the air flow into each heat dissipation pipe. The heat dissipation pipe is inserted through the second heat sink to form an efficient heat dissipation channel. This design enables the heat to be carried away more quickly by the high-speed air flow through the heat sink and the heat dissipation pipe, thereby effectively reducing the temperature of the molded case circuit breaker. Reducing the temperature helps to improve the stability of the molded case circuit breaker, ensuring that the internal temperature remains within a reasonable range during long-term operation, thus improving the stability and reliability of the device.

[0017] Preferably, according to any of the above solutions, the heat dissipation pipe is bonded to the second heat sink, and the material of the heat dissipation pipe is alumina ceramics.

[0018] Preferably, according to any of the above solutions, there are several connection points between the second heat sink and the heat dissipation pipe. The heat dissipation pipe is divided into a central pipe and several sub-pipes arranged in a circumferential array around the central pipe.

[0019] Preferably, according to any of the above solutions, the fan is installed horizontally, and the air outlet end of the fan faces the heat dissipation pipe.

[0020] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

[0021] For this molded case circuit breaker, through the cooperative setting of the connection plate, the first heat sink, the second heat sink, the heat dissipation pipe, the shunt joint and the fan, and the design of the connection plate, the first heat sink and the second heat sink, all of which adopt insulating and heat-conducting alumina ceramic materials, can effectively conduct away the heat of the circuit breaker, effectively increase its heat dissipation area, so as to improve the heat dissipation effect of the circuit breaker. In the working environment, a fan is designed and located below the side of the circuit breaker. The shunt joint connected to the output end of the fan evenly distributes the air flow into each heat dissipation pipe, and the heat dissipation pipe is penetrated through the second heat sink, forming an efficient heat dissipation channel. This design enables the heat to be carried away by the high-speed air flow more quickly through the heat sink and the heat dissipation pipe, thereby effectively reducing the temperature of the molded case circuit breaker. Reducing the temperature helps to improve the stability of the molded case circuit breaker, and can ensure that the internal temperature of the device remains within a reasonable range during long-term operation, thus improving the stability and reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0023] Figure 1 is a schematic structural diagram of the first perspective of the present utility model;

[0024] Figure 2 is a schematic structural diagram of the second perspective of the present utility model;

[0025] Figure 3 is a schematic structural diagram of the third perspective of the present utility model;

[0026] Figure 4 is a front view structural diagram of the present utility model.

[0027] In the figure: 1 - circuit breaker housing, 2 - handle, 3 - connection plate, 4 - first heat sink, 5 - second heat sink, 6 - heat dissipation pipe, 7 - shunt joint, 8 - fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0029] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] As Figures 1-4 shown, the molded case circuit breaker provided by the present utility model includes a circuit breaker housing 1, the circuit breaker housings 1 are combined by being abutted against each other, and a contact mechanism, a free tripping mechanism, an arc extinguishing mechanism, and a tripping unit are integrated inside the circuit breaker housing 1;

[0031] A handle 2 is movably connected to the front surface of the circuit breaker housing 1, and the handle 2 is connected to the contact mechanism inside the circuit breaker housing 1;

[0032] A connection plate 3 is fixedly connected to the side surface of the circuit breaker housing 1, and a plurality of first heat sinks 4 are fixedly connected to one side of the connection plate 3;

[0033] A plurality of second heat sinks 5 are fixedly connected to the bottom of the circuit breaker housing 1;

[0034] A heat dissipation pipe 6 is inserted through all the second heat sinks 5, a flow dividing joint 7 is fixedly connected to the end of the heat dissipation pipe 6, and a fan 8 is fixedly connected to one side of the flow dividing joint 7.

[0035] Embodiment 1: The material of the circuit breaker housing 1 is plastic, and the connection plate 3 is bonded to the circuit breaker housing 1. The materials of the connection plate 3, the first heat sinks 4, and the second heat sinks 5 are all alumina ceramics. The first heat sinks 4 are bonded to the connection plate 3, and the first heat sinks 4 are perpendicular to the surface of the connection plate 3. The second heat sinks 5 are parallel to each other, and the root of the heat dissipation pipe 6 is communicated with the flow dividing joint 7. In the working environment, a fan 8 is designed to be located below the side of the circuit breaker. The flow dividing joint 7 connected to the output end of the fan 8 evenly distributes the air flow into each heat dissipation pipe 6. The heat dissipation pipe 6 is inserted through the second heat sinks 5 to form an efficient heat dissipation channel. This design enables the heat to be carried away more quickly by the high-speed air flow through the heat sinks and the heat dissipation pipe 6, thereby effectively reducing the temperature of the molded case circuit breaker. Reducing the temperature helps to improve the stability of the molded case circuit breaker, and can ensure that the internal temperature of the device remains within a reasonable range during long-term operation, thereby improving the stability and reliability of the device.

[0036] Embodiment 2: The heat dissipation pipe 6 is bonded to the second heat dissipation fin 5, and the material of the heat dissipation pipe 6 is alumina ceramic. There are several connection points between the second heat dissipation fin 5 and the heat dissipation pipe 6. The heat dissipation pipe 6 is divided into a central pipe and several sub-pipes arranged in a circumferential array around the central pipe. The fan 8 is installed horizontally, and the air outlet end of the fan 8 faces the heat dissipation pipe 6.

[0037] The working principle of the present utility model is as follows:

[0038] The working principle of this molded case circuit breaker is that its main contacts are manually operated. After the main contacts are closed, the free tripping mechanism locks the main contacts in the closed position. When a short circuit or serious overload occurs in the circuit, the armature of the tripping unit is attracted, causing the free tripping mechanism to act and the main contacts to disconnect the main circuit. When the circuit is overloaded, the heating element of the thermal release heats up, causing the bimetal to bend upwards, pushing the free tripping mechanism to act and the main contacts to disconnect the main circuit. When the circuit is under-voltage, the armature of the under-voltage release is released, also causing the free tripping mechanism to act and the main contacts to disconnect the main circuit;

[0039] Compared with the prior art, the present utility model has the following beneficial effects compared with the prior art:

[0040] For this molded case circuit breaker, through the cooperative setting of the connection plate 3, the first heat dissipation fin 4, the second heat dissipation fin 5, the heat dissipation pipe 6, the shunt joint 7 and the fan 8, and the design of the connection plate 3, the first heat dissipation fin 4, and the second heat dissipation fin 5, all of which are made of insulating and heat-conducting alumina ceramic material, can effectively conduct away the heat of the circuit breaker, effectively increase its heat dissipation area, so as to improve the heat dissipation effect of the circuit breaker. In the working environment, the fan 8 is designed to be located at the lower side of the circuit breaker. The shunt joint 7 connected to the output end of the fan 8 evenly distributes the air flow into each heat dissipation pipe 6. The heat dissipation pipe 6 is inserted through the second heat dissipation fin 5 to form an efficient heat dissipation channel. This design enables the heat to be carried away by the high-speed air flow more quickly through the heat dissipation fins and the heat dissipation pipe 6, thereby effectively reducing the temperature of the molded case circuit breaker. Reducing the temperature helps to improve the stability of the molded case circuit breaker, and can ensure that the internal temperature of the device remains within a reasonable range during long-term operation, thereby improving the stability and reliability of the device.

Claims

1. A molded case circuit breaker, characterized in that: It comprises a circuit breaker housing (1), wherein the circuit breaker housings (1) are close together and assembled together, and the interior of the circuit breaker housing (1) is integrated with a contact mechanism, a free tripping mechanism, an arc extinguishing mechanism, and a tripping unit; A handle (2) is movably connected to the front of the circuit breaker housing (1), and the handle (2) is connected to a contact mechanism inside the circuit breaker housing (1); A connecting plate (3) is fixedly connected to the side of the circuit breaker housing (1), and a plurality of first heat sinks (4) are fixedly connected to one side of the connecting plate (3); A plurality of second heat sinks (5) are fixedly connected to the bottom of the circuit breaker housing (1); All the second heat sinks (5) are connected with heat dissipation pipes (6), the ends of the heat dissipation pipes (6) are fixedly connected with shunt joints (7), and one side of the shunt joints (7) is fixedly connected with a fan (8).

2. A molded case circuit breaker according to claim 1, characterized in that: The material of the circuit breaker housing (1) is plastic, and the connecting plate (3) is bonded to the circuit breaker housing (1).

3. A molded case circuit breaker according to claim 2, characterized in that: The connecting plate (3), the first heat sink (4) and the second heat sink (5) are all made of alumina ceramics; the first heat sink (4) is bonded to the connecting plate (3); the first heat sink (4) is perpendicular to the surface of the connecting plate (3).

4. A molded case circuit breaker according to claim 3, characterized in that: The second heat sinks (5) are parallel to each other, and the root of the heat dissipation pipe (6) is connected to the shunt joint (7).

5. A molded case circuit breaker according to claim 4, characterized in that: The heat dissipation tube (6) is bonded to the second heat dissipation fin (5), and the material of the heat dissipation tube (6) is alumina ceramic.

6. A molded case circuit breaker according to claim 5, characterized in that: There are a plurality of connection points between the second heat sink (5) and the heat dissipation tube (6), and the heat dissipation tube (6) is divided into a central tube and a plurality of auxiliary tubes in a circumferential array around the central tube.

7. A molded case circuit breaker according to claim 6, characterized in that: The fan (8) is installed transversely, and the air outlet end of the fan (8) faces the heat dissipation pipe (6).

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