High-current-limiting quick-breaking molded case circuit breaker

Abstract

The utility model relates to the field of molded case circuit breakers, in particular to a high-current-limiting quick-breaking molded case circuit breaker, which comprises a molded case circuit breaker body, a switch body is arranged on one side of the molded case circuit breaker body, heat dissipation mechanisms are arranged on two sides of the molded case circuit breaker body, and the two heat dissipation mechanisms are identical in structure. According to the molded case circuit breaker, the heat dissipation copper plate and the circulation groove are arranged, the contact area of heat generated by the molded case circuit breaker and the molded case circuit breaker body is increased, the heat absorption and conduction efficiency is improved, the heat dissipation fan is arranged, flowing of air around the heat dissipation copper plate is accelerated, the temperature in the molded case circuit breaker body is reduced, and the service life of the molded case circuit breaker is prolonged. The problems that the coil resistance of the electromagnetic release is increased and the response speed is slowed down due to over-high temperature are reduced, so that the performance and the service life of internal elements are protected, proper temperature control is also beneficial to maintaining the elastic modulus of the spring, the breaking speed of a circuit breaker is not influenced, and the high-current-limiting and rapid breaking capacity is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the technical field of molded case circuit breakers, and specifically relates to a high current limiting and fast breaking molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers, also known as modular circuit breakers, are devices used for long-time overload and instantaneous short-circuit tripping. All their parts are sealed in a plastic housing to isolate conductors from grounded metal parts. They have current-limiting breaking capacity. Molded case circuit breakers usually contain a thermomagnetic trip unit, and larger models are also equipped with solid-state trip sensors.

[0003] A search revealed that in the prior art, Chinese Patent Publication No. CN213691904U, authorized on July 13, 2021, discloses a molded case circuit breaker. This invention solves the problem that the presence of fixing components in existing structures requires maintenance personnel to use tools for disassembly, causing inconvenience for daily maintenance. The circuit breaker includes a circuit breaker body and outgoing line clamping bolts. A housing is provided on the outer side of the circuit breaker body. A first housing is hinged to one side of the top of the housing. A second housing is inserted into one end of the first housing. Sleeves are provided on both sides of the first housing, and rods are provided on both sides of the second housing. The rods are inserted into the sleeves. A limiting disc is provided on the rod inside the sleeve, and a fastening spring is located on one side of the limiting disc. Connecting blocks are provided on both sides of one end of the second housing, and a locking block is provided at the bottom of the connecting block. This invention has a novel structure and ingenious design, facilitating the maintenance of components in the mounting cavity inside the circuit breaker body without requiring maintenance personnel to disassemble it with tools, thus benefiting the maintenance and repair of the circuit breaker.

[0004] However, the device still has the following drawbacks: Although it can effectively improve the problem that some existing molded case circuit breakers are difficult to disassemble during maintenance, causing inconvenience to the maintenance of molded case circuit breakers, the molded case circuit breaker will generate a certain amount of heat due to resistance during use. If the heat is not dissipated well, it will accumulate and increase the internal temperature of the molded case circuit breaker. The excessively high temperature will increase the coil resistance of the electromagnetic trip unit, affecting its electromagnetic induction performance and slowing down the response speed of the trip unit. At the same time, it will also have a certain impact on the elastic modulus of the spring, which may reduce the breaking speed of the circuit breaker and thus affect its high current limiting and fast breaking capability. Utility Model Content

[0005] To address the above problems, this utility model provides a high current-limiting and fast-breaking molded case circuit breaker, including a molded case circuit breaker body, a switch body is provided on one side of the molded case circuit breaker body, and heat dissipation mechanisms are provided on both sides of the molded case circuit breaker body, and the two heat dissipation mechanisms have the same structure.

[0006] The heat dissipation mechanism includes a heat dissipation copper plate disposed on one side of the molded case circuit breaker body. A threaded hole is provided on one side of the heat dissipation copper plate. A fixing block is fixedly connected to the side of the heat dissipation copper plate away from the molded case circuit breaker body. An installation groove is provided on one side of the fixing block. A filter screen is disposed inside the installation groove. The outer side of the filter screen is fixedly connected to the fixing block. A cooling fan is fixedly connected to the inner side of the fixing block. A temperature sensor is disposed on one side of the molded case circuit breaker body, and the temperature sensor is electrically connected to the cooling fan.

[0007] Furthermore, a protective frame is provided on one side of the fixing block, the protective frame is located on the outside of the cooling fan, and a baffle is fixedly connected to the inside of the protective frame.

[0008] Furthermore, a hollow groove is provided on one side of the shield, and multiple hollow grooves are provided, all of which are the same size, and the hollow grooves are used to increase air circulation.

[0009] Furthermore, a flow groove is provided on one side of the heat dissipation copper plate, and multiple flow grooves are provided to increase the contact area.

[0010] Furthermore, a copper pipe is fixedly connected to the outside of the molded case circuit breaker body, one side of the copper pipe is located on the side of the heat dissipation copper plate close to the molded case circuit breaker body, and one side of the copper pipe is fixedly connected to the heat dissipation copper plate.

[0011] Furthermore, a card plate is fixedly connected to one side of the protective frame, and a card slot is opened on one side of the fixing block, with the card plate movably engaging inside the card slot.

[0012] Furthermore, an auxiliary heat dissipation plate is fixedly connected to the side of the heat dissipation copper plate away from the molded case circuit breaker body, and multiple auxiliary heat dissipation plates are provided. The multiple auxiliary heat dissipation plates are symmetrically arranged with the center of the heat dissipation copper plate as the central axis, and the multiple auxiliary heat dissipation plates are the same size.

[0013] The beneficial effects of this utility model are:

[0014] 1. By setting up a heat dissipation copper plate and its flow groove, this device greatly increases the contact area with the molded case circuit breaker body to generate heat, thereby improving the heat absorption and conduction efficiency. The setting of the cooling fan accelerates the airflow around the heat dissipation copper plate, further enhancing the heat dissipation effect, reducing the internal temperature of the molded case circuit breaker body, and reducing problems such as increased electromagnetic trip coil resistance and slowed response speed caused by excessive temperature. This protects the performance and life of internal components. Proper temperature control also helps to maintain the elastic modulus of the spring, so that the breaking speed of the circuit breaker is not affected, ensuring the high current limiting and fast breaking capability.

[0015] 2. The design of the protective frame and shield in this device not only provides necessary protection for the cooling fan and prevents the intrusion of debris and dust, but also ensures airflow through the hollow slot design without affecting the heat dissipation effect. The detachable connection of the slot and plate allows the heat dissipation mechanism to be easily disassembled when needed, facilitating the cleaning and maintenance of the cooling fan and other components, and extending the overall service life.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A structural main body diagram according to an embodiment of the present utility model is shown;

[0019] Figure 2 A rear view structural schematic diagram according to an embodiment of the present utility model is shown;

[0020] Figure 3 A cross-sectional view of the heat dissipation copper plate according to an embodiment of the present invention is shown;

[0021] Figure 4 A schematic diagram of the copper tube structure according to an embodiment of the present invention is shown;

[0022] Figure 5 A schematic diagram of the card slot and card plate according to an embodiment of the present invention is shown.

[0023] In the diagram: 1. Molded case circuit breaker body; 2. Switch body; 3. Heat dissipation mechanism; 31. Heat dissipation copper plate; 32. Threaded hole; 33. Fixing block; 34. Mounting slot; 35. Filter screen; 36. Cooling fan; 37. Temperature sensor; 4. Auxiliary heat dissipation plate; 5. Copper pipe; 61. Protective frame; 62. Shielding plate; 7. Hollow groove; 8. Flow groove; 91. Card slot; 92. Card plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] This utility model embodiment provides a high current-limiting, fast-breaking molded case circuit breaker, including a molded case circuit breaker body 1, exemplarily, such as... Figures 1-5 As shown.

[0026] A switch body 2 is provided on one side of the molded case circuit breaker body 1, and heat dissipation mechanisms 3 are provided on both sides of the molded case circuit breaker body 1, and the two heat dissipation mechanisms 3 have the same structure.

[0027] The heat dissipation mechanism 3 includes a heat dissipation copper plate 31 disposed on one side of the molded case circuit breaker body 1. A threaded hole 32 is provided on one side of the heat dissipation copper plate 31. A fixing block 33 is fixedly connected to the side of the heat dissipation copper plate 31 away from the molded case circuit breaker body 1. A mounting groove 34 is provided on one side of the fixing block 33. A filter screen 35 is disposed inside the mounting groove 34. The outer side of the filter screen 35 is fixedly connected to the fixing block 33. A cooling fan 36 is fixedly connected to the inner side of the fixing block 33. A temperature sensor 37 is disposed on one side of the molded case circuit breaker body 1, and the temperature sensor 37 is electrically connected to the cooling fan 36.

[0028] A protective frame 61 is provided on one side of the fixing block 33. The protective frame 61 is located on the outside of the cooling fan 36, and a baffle plate 62 is fixedly connected to the inside of the protective frame 61.

[0029] A hollow groove 7 is provided on one side of the shield 62, and multiple hollow grooves 7 are provided. The multiple hollow grooves 7 are the same size, and the hollow grooves 7 are used to increase air circulation.

[0030] Specifically, the switch body 2 can be used to control the switching of the molded case circuit breaker body 1. Both the molded case circuit breaker body 1 and the switch body 2 are existing technologies in the field, so they will not be described in detail here. The heat dissipation copper plate 31 can absorb the heat generated by the molded case circuit breaker body 1 during operation, thereby reducing the heat accumulated inside the molded case circuit breaker body 1 during use and lowering its temperature. The threaded hole 32 can facilitate the connection between the heat dissipation copper plate 31 and the molded case circuit breaker body 1 by the operators.

[0031] In addition, the fixing block 33 can install and connect the cooling fan 36 and the filter screen 35. The cooling fan 36 can increase the airflow speed around the heat dissipation copper plate 31 during operation, thereby achieving the heat dissipation effect of the heat dissipation copper plate 31. This allows the heat dissipation copper plate 31 to continuously absorb more heat into the interior of the molded case circuit breaker body 1. At the same time, the filter screen 35 can block the dust flowing into the inside of the fixing block 33, thereby reducing the situation where the cooling fan 36 has a poor heat dissipation effect and a significant decrease in speed due to a lot of dust adhering to the inside.

[0032] In addition, the temperature sensor 37 can detect the internal temperature of the molded case circuit breaker body 1. When the temperature sensor 37 detects that the internal temperature of the molded case circuit breaker body 1 is too high, it can control the cooling fan 36 through its electrical connection with the cooling fan 36, increasing the speed of the cooling fan 36 during operation, thereby increasing the heat dissipation effect of the cooling fan 36. The protective frame 61 and the baffle 62 can shield the outside of the cooling fan 36, reducing the collision and impact of debris or other objects on the cooling fan 36. This makes it less likely that the cooling fan 36 will be unable to operate smoothly due to other objects being rolled into its inside. The hollow groove 7 ensures that the baffle 62 can shield and protect the cooling fan 36 without hindering or affecting its heat dissipation effect. Since the two heat dissipation mechanisms 3 have the same structure, their working principles are also the same, which will not be elaborated further here.

[0033] A flow groove 8 is provided on one side of the heat dissipation copper plate 31. Multiple flow grooves 8 are provided, and these multiple flow grooves 8 are used to increase the contact area, such as... Figures 1-5 As shown.

[0034] A copper pipe 5 is fixedly connected to the outside of the molded case circuit breaker body 1. One side of the copper pipe 5 is located on the side of the heat dissipation copper plate 31 close to the molded case circuit breaker body 1, and one side of the copper pipe 5 is fixedly connected to the heat dissipation copper plate 31.

[0035] A card plate 92 is fixedly connected to one side of the protective frame 61, and a slot 91 is opened on one side of the fixing block 33. The card plate 92 is movably engaged with the inside of the slot 91.

[0036] An auxiliary heat dissipation plate 4 is fixedly connected to the side of the heat dissipation copper plate 31 away from the molded case circuit breaker body 1, and multiple auxiliary heat dissipation plates 4 are provided. The multiple auxiliary heat dissipation plates 4 are symmetrically arranged with the center of the heat dissipation copper plate 31 as the central axis, and the multiple auxiliary heat dissipation plates 4 are the same size.

[0037] Specifically, the arrangement of the flow channel 8 allows the heat emitted by the molded case circuit breaker body 1 during use to be absorbed more effectively and over a larger area by the heat dissipation copper plate 31, thereby increasing the heat dissipation effect of the heat dissipation copper plate 31 on the molded case circuit breaker body 1. The copper pipe 5 can absorb a certain amount of heat on the back of the molded case circuit breaker body 1 and transfer the heat to the connection between itself and the heat dissipation copper plate 31 through its connection with the heat dissipation copper plate 31, thereby further improving the heat dissipation effect on the molded case circuit breaker body 1.

[0038] Furthermore, the slot 91 and the plate 92 allow the connection between the protective frame 61 and the fixing block 33 to be disassembled or reinstalled. This allows the cooling fan 36 to be maintained and cleaned along with the molded case circuit breaker body 1 when maintenance is required. The auxiliary heat dissipation plate 4 can also assist the heat dissipation copper plate 31, thereby further increasing the heat dissipation effect of the heat dissipation copper plate 31 during use. This reduces the heat accumulated inside the molded case circuit breaker body 1 and lowers the internal temperature of the molded case circuit breaker body 1.

[0039] The working principle of the high current-limiting and fast-breaking molded case circuit breaker proposed in this embodiment is as follows: When the molded case circuit breaker body 1 starts working, a certain amount of heat is generated due to the resistance generated by the current. The heat dissipation copper plate 31 can absorb some of the heat generated by the molded case circuit breaker body 1 during operation. The cooling fan 36 runs within the fixed block 33, increasing the airflow speed around the heat dissipation copper plate 31. The flowing air carries away the heat on the heat dissipation copper plate 31, achieving the heat dissipation effect on the molded case circuit breaker body 1. The filter screen 35 is set in the mounting groove 34 of the fixed block 33, blocking dust and debris in the air from entering the interior of the cooling fan 36, reducing the amount of dust adhering to the inside of the cooling fan 36. This reduces the heat dissipation effect and speed. The temperature sensor 37 monitors the internal temperature of the molded case circuit breaker body 1 in real time. When the temperature exceeds the preset threshold, the temperature sensor 37 controls the speed of the cooling fan 36 to increase through electrical connection to enhance the heat dissipation effect. The copper pipe 5 absorbs the heat on the back of the molded case circuit breaker body 1 and transfers the heat to the heat dissipation copper plate 31 through connection with the heat dissipation copper plate 31, further improving the heat dissipation effect. This effectively reduces the internal temperature of the molded case circuit breaker body 1 during use and reduces problems such as increased electromagnetic trip coil resistance and slowed response speed caused by excessive temperature. This ensures that the high current limiting and fast breaking capacity of the molded case circuit breaker can be maintained in good condition.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high current-limiting, fast-breaking molded case circuit breaker, comprising a molded case circuit breaker body (1), characterized in that: A switch body (2) is provided on one side of the molded case circuit breaker body (1), and heat dissipation mechanisms (3) are provided on both sides of the molded case circuit breaker body (1), and the two heat dissipation mechanisms (3) have the same structure. The heat dissipation mechanism (3) includes a heat dissipation copper plate (31) disposed on one side of the molded case circuit breaker body (1). A threaded hole (32) is provided on one side of the heat dissipation copper plate (31). A fixing block (33) is fixedly connected to the side of the heat dissipation copper plate (31) away from the molded case circuit breaker body (1). An installation groove (34) is provided on one side of the fixing block (33). A filter screen (35) is provided inside the installation groove (34). The outer side of the filter screen (35) is fixedly connected to the fixing block (33). A cooling fan (36) is fixedly connected to the inner side of the fixing block (33). A temperature sensor (37) is provided on one side of the molded case circuit breaker body (1), and the temperature sensor (37) is electrically connected to the cooling fan (36).

2. The high current-limiting, fast-breaking molded case circuit breaker according to claim 1, characterized in that: A protective frame (61) is provided on one side of the fixing block (33). The protective frame (61) is located on the outside of the cooling fan (36). A baffle plate (62) is fixedly connected to the inside of the protective frame (61).

3. A high current-limiting, fast-breaking molded case circuit breaker according to claim 2, characterized in that: A hollow groove (7) is provided on one side of the shield (62), and multiple hollow grooves (7) are provided. The multiple hollow grooves (7) are the same size, and the hollow grooves (7) are used to increase air circulation.

4. A high current-limiting, fast-breaking molded case circuit breaker according to claim 3, characterized in that: A flow groove (8) is provided on one side of the heat dissipation copper plate (31). Multiple flow grooves (8) are provided, and multiple flow grooves (8) are used to increase the contact area.

5. A high current-limiting, fast-breaking molded case circuit breaker according to claim 4, characterized in that: A copper pipe (5) is fixedly connected to the outside of the molded case circuit breaker body (1). One side of the copper pipe (5) is located on the side of the heat dissipation copper plate (31) close to the molded case circuit breaker body (1), and one side of the copper pipe (5) is fixedly connected to the heat dissipation copper plate (31).

6. A high current-limiting, fast-breaking molded case circuit breaker according to claim 5, characterized in that: A card plate (92) is fixedly connected to one side of the protective frame (61), and a slot (91) is provided on one side of the fixing block (33). The card plate (92) is movably engaged with the inside of the slot (91).

7. A high current-limiting, fast-breaking molded case circuit breaker according to claim 5, characterized in that: An auxiliary heat dissipation plate (4) is fixedly connected to the side of the heat dissipation copper plate (31) away from the molded case circuit breaker body (1), and multiple auxiliary heat dissipation plates (4) are provided. The multiple auxiliary heat dissipation plates (4) are symmetrically arranged with the center of the heat dissipation copper plate (31) as the central axis, and the multiple auxiliary heat dissipation plates (4) are the same size.

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