Molded case circuit breaker with heat dissipation structure

Abstract

The utility model discloses a molded case circuit breaker with a heat dissipation structure, the molded case circuit breaker with the heat dissipation structure comprises a base and wiring terminals arranged at two ends of the base, two ends of the base are provided with a plurality of grooves at equal intervals and are located below the wiring terminals, the wiring terminals are provided with heat dissipation pieces and are arranged in the grooves, and the heat dissipation pieces are arranged in the grooves. A wind tunnel is formed in the side edge of the base and penetrates through the multiple grooves to the other side of the base, and a strong heat dissipation assembly is arranged at an inlet of the wind tunnel and communicates with the wind tunnel. According to the utility model, the air flow speed in the wind tunnel is improved through the strong heat dissipation assembly, heat exchange is carried out with the heat dissipation piece, the temperature rise of the wiring terminal is further effectively reduced, and through the structural design of the concave cavity and the wind tunnel, stable cold air can be conveyed to the wind tunnels at the two sides of the base through only one centrifugal fan; therefore, the energy consumption during forced air cooling is reduced, and the product has the advantages of improving the heat dissipation effect and effectively controlling the temperature rise of the wiring terminal.

Description

Technical Field

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

[0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Low-voltage circuit breakers are also called automatic switches, commonly known as "air switches". They are electrical appliances that have both the function of manual switches and can automatically protect against loss of voltage, undervoltage, overload, and short circuit. They can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overloads, short circuits, undervoltage, and other faults, they can automatically cut off the circuit. Moreover, after breaking the fault current, there is generally no need to change parts, and they have been widely used.

[0003] When the molded case circuit breaker works under load for a long time, a large amount of heat will be generated at the wiring terminals, causing the temperature inside the molded case circuit breaker to rise. The high temperature rise makes the working environment of the molded case circuit breaker harsh, bringing many disadvantages, such as causing premature aging of insulating parts, accelerated oxidation of moving contacts and other adverse conditions, which greatly affect the service life of the molded case circuit breaker. Therefore, the applicant has made a beneficial design and found a solution to the above problems. The technical solution to be introduced below is produced in this context. Summary of the invention

[0004] The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional molded case circuit breaker design and provide a product that improves the heat dissipation effect and effectively controls the temperature rise of the wiring terminals.

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

[0006] A molded case circuit breaker with a heat dissipation structure comprises a base and wiring terminals arranged at both ends of the base, wherein a plurality of grooves with equal spacing are arranged at both ends of the base and are located below the wiring terminals, the wiring terminals are provided with heat dissipating members and are arranged in the grooves, a wind tunnel is provided on the side of the base and passes through the plurality of grooves to the other side of the base, a strong heat dissipating component is provided at the entrance of the wind tunnel and is connected to the wind tunnel.

[0007] Preferably, the heat sink is provided with a plurality of heat sink fins with equal spacing, and the inlet of the heat sink fins faces the air flow direction of the wind tunnel, and silicone grease is applied between the heat sink and the wiring terminal.

[0008] Preferably, the strong heat dissipation component includes a sealing plate, a centrifugal fan, and a sealing member. The sealing member is installed and fixed on the end face of the concave cavity. The sealing plate is fixed to one side of the base by screws so that the sealing member abuts against the side of the base. The sealing plate is provided with a concave cavity and is connected to the wind tunnel. An air inlet is provided on one side of the concave cavity.

[0009] Preferably, the centrifugal fan is mounted and fixed on the sealing plate, and the air outlet of the centrifugal fan is connected to the air inlet.

[0010] Beneficial effects:

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model increases the air flow speed in the wind tunnel through a strong heat dissipation component and performs heat exchange with the heat dissipation element, thereby effectively reducing the temperature rise of the terminal blocks. Through the structural design of the cavity and the wind tunnel, only one centrifugal fan is needed to deliver stable cold air to the wind tunnels on both sides of the base, thereby reducing the energy consumption during forced air cooling, so that the product has the advantages of improving the heat dissipation effect and effectively controlling the temperature rise of the terminal blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional schematic diagram of a wiring terminal of a molded case circuit breaker with a heat dissipation structure according to the utility model;

[0014] Figure 2 It is a schematic diagram of the side cross-sectional structure of a strong heat dissipation component of a molded case circuit breaker with a heat dissipation structure of the utility model;

[0015] Figure 3 This is a structural schematic diagram of a strong heat dissipation component of a molded case circuit breaker with a heat dissipation structure according to the utility model;

[0016] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0017] Figure numerals: 1, base; 2, terminal; 3, heat sink; 4, strong heat dissipation component; 11, groove; 12, wind tunnel; 31, heat dissipation fin; 41, cover plate; 42, centrifugal fan; 43, seal; 411, cavity; 412, air inlet. DETAILED DESCRIPTION

[0018] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. 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.

[0019] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0020] Reference example Figures 1 to 3 A molded case circuit breaker with a heat dissipation structure comprises a base 1 and wiring terminals 2 arranged at both ends of the base 1. A plurality of grooves 11 with equal spacing are arranged at both ends of the base 1 and are located below the wiring terminals 2. The wiring terminals 2 are provided with heat sinks 3 and are arranged in the grooves 11. A wind tunnel 12 is provided on the side of the base 1 and penetrates through a plurality of grooves 11 to the other side of the base 1. A strong heat dissipation component 4 is provided at the entrance of the wind tunnel 12 and is connected to the wind tunnel 12. The wiring terminals 2 are electrically connected to the dynamic and static springs in the base 1. The wind tunnel 12 connects a plurality of grooves 11, which not only reduces the amount of modification to the base 1, but also facilitates forced air cooling and reduces the amount of heat dissipation device used. The strong heat dissipation component 4 outputs stable cold air through a plurality of heat sinks 3 and is discharged from the other end of the wind tunnel 12.

[0021] It is worth mentioning that the heat sink 3 is provided with a plurality of heat sink fins 31 with equal spacing, and the entrance of the heat sink fins 31 faces the air flow direction of the wind tunnel 12. Silicone grease is applied between the heat sink 3 and the terminal 2. The heat sink fins 31 increase the area in contact with the air, thereby improving the heat exchange efficiency. The silicone grease reduces the gap between the heat sink 3 and the terminal 2, thereby improving the thermal conductivity. The heat sink 3 can be made of copper or aluminum.

[0022] It is worth mentioning that the strong heat dissipation component 4 includes a sealing plate 41, a centrifugal fan 42, and a sealing member 43. The sealing member 43 is installed and fixed on the end face of the concave cavity 411. The sealing plate 41 is fixed to one side of the base 1 by screws, so that the sealing member 43 abuts against the side of the base 1. The sealing plate 41 is provided with a concave cavity 411 and is connected to the wind tunnel 12. An air inlet 412 is provided on one side of the concave cavity 411. When the airflow delivered by the centrifugal fan 42 enters the concave cavity 411 and passes through the groove 11 in sequence along the wind tunnel 12, the sealing member 43 can be selected as a packing seal or a sealing strip. The sealing member 43 forms a relatively sealed structure between the concave cavity 411 and the base 1, thereby preventing the high-pressure airflow output by the centrifugal fan 42 from leaking and causing the air flow speed in the wind tunnel 12 to decrease.

[0023] It is worth mentioning that the centrifugal fan 42 is installed and fixed on the sealing plate 41, and the air outlet of the centrifugal fan 42 is connected with the air inlet 412. When the blades in the centrifugal fan 42 rotate to push the air to flow in a direction perpendicular to the axis (i.e. radially), the air intake is along the axial direction, and the air outlet is perpendicular to the axial direction. The blades pressurize the air in the fan casing, thereby generating a stable, high-pressure airflow into the air inlet 412.

[0024] The above design scheme can enable the product to achieve the advantages of improving heat dissipation effect and effectively controlling the temperature rise of the terminal blocks.

[0025] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A molded case circuit breaker with a heat dissipation structure, comprising a base (1), and connection terminals (2) arranged at both ends of the base (1), characterized in that: The two ends of the base (1) are provided with a plurality of grooves (11) at equal intervals and are located below the connecting terminal (2); the connecting terminal (2) is provided with a heat sink (3) and is arranged in the groove (11); a wind tunnel (12) is provided on the side of the base (1) and passes through the plurality of grooves (11) to the other side of the base (1); a strong heat dissipation component (4) is provided at the entrance of the wind tunnel (12) and is in communication with the wind tunnel (12).

2. The molded case circuit breaker with a heat dissipation structure according to claim 1, characterized in that: The heat sink (3) is provided with a plurality of heat sink fins (31) at equal intervals, and the entrances of the heat sink fins (31) face the air flow direction of the wind tunnel (12), and silicone grease is applied between the heat sink (3) and the connection terminal (2).

3. The molded case circuit breaker with heat dissipation structure according to claim 1, characterized in that: The strong heat dissipation component (4) comprises a sealing plate (41), a centrifugal fan (42), and a sealing member (43); the sealing member (43) is installed and fixed on the end surface of the concave cavity (411); the sealing plate (41) is fixed to one side of the base (1) by means of screws, so that the sealing member (43) abuts against the side of the base (1); the sealing plate (41) is provided with a concave cavity (411) and is connected to the wind tunnel (12); and an air inlet (412) is provided on one side of the concave cavity (411).

4. The molded case circuit breaker with a heat dissipation structure according to claim 3, characterized in that: The centrifugal fan (42) is mounted and fixed on the sealing plate (41), and the air outlet of the centrifugal fan (42) is connected to the air inlet (412).

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