A high temperature resistant molded case circuit breaker

Abstract

The utility model relates to the technical field of circuit breaker, specifically disclose a kind of high-temperature-resistant plastic shell circuit breaker, including circuit breaker main body, the outside of circuit breaker main body is provided with double-layer heat insulation mechanism. The utility model is filled with lightweight thermal insulation material by setting double-layer heat insulation mechanism, and the circuit breaker shell is designed into inside and outside two layers, and lightweight thermal insulation material is arranged between two layers, can isolate external heat transmission to circuit breaker, shell simultaneously adopts high-temperature-resistant engineering plastic PPS, instead of traditional ordinary engineering plastic, can improve the thermal deformation temperature of shell, secondly, a metal support skeleton is embedded in the inside of inner layer, ordinary plastic can soften under high-temperature environment, but metal support skeleton can guarantee that circuit breaker does not deform as a whole;Uniform heat dissipation mechanism is simultaneously arranged, and different module systems in circuit breaker are divided into two areas, a set of air intake system is arranged in the inside of circuit breaker, can make that circuit breaker inside evenly radiate heat, to effectively balance the temperature inside circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically a high-temperature resistant molded case circuit breaker. Background Technology

[0002] A circuit breaker is a switching device that can close, carry, and interrupt current under normal circuit conditions and can close, carry, and interrupt current under abnormal circuit conditions within a specified time.

[0003] In the existing technology, the circuit breaker housing is made of a single material of engineering plastic (such as nylon and ABS) through injection molding. The internal parts of the circuit breaker include the contact system, arc extinguishing system and operating system. Ordinary engineering plastics have a limited heat distortion temperature. When the circuit breaker is in a high-temperature environment for a long time, the housing strength will decrease and it will be prone to softening and deformation. This will not only affect the appearance of the circuit breaker, but also cause internal structural displacement, resulting in a huge safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature resistant molded case circuit breaker to solve the problems in the prior art.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A high-temperature resistant molded case circuit breaker includes a circuit breaker body, and a double-layer heat insulation mechanism is provided on the outside of the circuit breaker body.

[0007] The double-layer insulation mechanism consists of an outer layer, a filling layer, an inner layer, and a metal support frame. The outer layer is located on the outermost side of the circuit breaker body, and the inner layer is located inside the outer layer. A filling layer is located between the outer layer and the inner layer. The outer layer, the filling layer, and the inner layer together form the outer shell. A metal support frame is located inside the inner layer. The left and right sides of the middle part of the metal support frame are fixedly connected to the middle part of the inner side of the circuit breaker body by screws.

[0008] Preferably, the circuit breaker body is provided with a uniform heat dissipation mechanism, which includes a flow guide box fixedly installed on the upper side of the inside of the circuit breaker body by screws.

[0009] Preferably, a flow guide tube is fixedly installed at both the upper and lower ends of the middle part of the flow guide box, and a heat dissipation port is tightly connected to the upper end of the flow guide tube.

[0010] Preferably, the heat dissipation vent is located inside the upper side of the circuit breaker body.

[0011] Preferably, the lower end of the guide pipe is closely fitted with an air inlet, which is located inside the lower side of the circuit breaker body.

[0012] Preferably, the lower inner wall of the guide tube has diversion ports opened vertically at equal intervals.

[0013] Preferably, the circuit breaker body has two heat dissipation vents that are vertically and equally spaced on the left and right sides.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model sets up a double-layer heat insulation mechanism, designing the circuit breaker shell into two layers, with lightweight heat insulation material filling the space between the two layers. This effectively isolates external heat from being transferred into the circuit breaker. At the same time, the shell is made of high-temperature resistant engineering plastic PPS, replacing traditional ordinary engineering plastics, which can directly increase the heat deformation temperature of the shell. Furthermore, a metal support frame is embedded inside the inner layer. Ordinary plastics may soften under high-temperature conditions, but the metal support frame can ensure that the circuit breaker as a whole does not deform or collapse.

[0016] 2. This utility model, by setting a uniform heat dissipation mechanism, divides the different module systems inside the circuit breaker into two areas. An air intake system is set inside the circuit breaker, which enables uniform heat dissipation inside the circuit breaker, thereby effectively balancing the internal temperature of the circuit breaker, avoiding local overheating, and preventing accelerated aging of insulation materials, plastic parts and electronic components, thus improving the service life of the entire circuit breaker. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a front view structural diagram of the circuit breaker of this utility model;

[0019] Figure 2 This is a schematic diagram of the connection structure of the outer layer, filling layer and inner layer of the circuit breaker of this utility model;

[0020] Figure 3 This is a schematic diagram of the uniform heat dissipation mechanism, air inlet and heat dissipation outlet of the circuit breaker of this utility model.

[0021] Figure 4 This is a schematic diagram of the connection structure of the circuit breaker's current guide box, current guide pipe, and current shunt port.

[0022] The attached figures are labeled as follows:

[0023] 1. Circuit breaker body; 2. Double-layer insulation mechanism; 21. Outer layer; 22. Filling layer; 23. Inner layer; 24. Metal support frame; 3. Uniform heat dissipation mechanism; 31. Flow guide box; 32. Flow guide pipe; 33. Air inlet; 34. Heat dissipation port one; 35. Diversion port; 36. Heat dissipation port two. Detailed Implementation

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

[0025] To address the problems existing in the prior art, this embodiment provides the following technical solution: a high-temperature molded case circuit breaker, comprising a circuit breaker body 1, with a double-layer heat insulation mechanism 2 on the outer side of the circuit breaker body 1. The double-layer heat insulation mechanism 2 consists of an outer layer 21, a filling layer 22, an inner layer 23, and a metal support frame 24. The outer layer 21, the filling layer 22, and the inner layer 23 together form the outer shell. The filling layer 22 is disposed inside the outer layer 21 and the inner layer 23. The outer layer 21 and the inner layer 23 are made of high-temperature resistant engineering plastic PPS, which can directly improve the heat dissipation of the outer shell. The deformation temperature is controlled, and the filling layer 22 is made of lightweight thermal insulation material, which can effectively isolate external heat from being transferred into the circuit breaker body 1. In addition, a metal support frame 24 is set on the inner side of the inner layer 23. If the outer shell softens in a high-temperature environment, the metal support frame 24 can ensure that the circuit breaker body 1 does not deform or collapse. At the same time, a uniform heat dissipation mechanism 3 is set inside the circuit breaker body 1. By setting up an air intake system, the heat dissipation inside the circuit breaker body 1 can be uniform, thereby effectively balancing the internal temperature of the circuit breaker body 1 and avoiding local overheating.

[0026] like Figures 1-4 As shown, a high-temperature resistant molded case circuit breaker is provided with a circuit breaker body 1, and a double-layer heat insulation mechanism 2 is provided on the outside of the circuit breaker body 1.

[0027] The double-layer heat insulation mechanism 2 consists of an outer layer 21, a filling layer 22, an inner layer 23, and a metal support frame 24. The outer layer 21, the filling layer 22, and the inner layer 23 are combined to form the outer shell. The outer layer 21 is located on the outermost side of the circuit breaker body 1, and the inner layer 23 is located on the inner side of the outer layer 21. The outer layer 21 and the inner layer 23 are made of high-temperature resistant engineering plastic PPS, which replaces the traditional ordinary engineering plastic material and can directly improve the heat distortion temperature of the double-layer heat insulation mechanism 2.

[0028] Meanwhile, a filling layer 22 is provided between the outer layer 21 and the inner layer 23. The filling layer 22 is a lightweight heat insulation material such as ceramic fiber or aerogel, which can effectively isolate external heat from being transferred into the circuit breaker body 1.

[0029] In addition, a metal support frame 24 is provided on the inner side of the inner layer 23. At the same time, round holes are opened on the left and right sides of the middle part of the metal support frame 24. The round holes can be horizontally fitted with the threaded holes opened on the left and right sides of the middle part of the inner side of the circuit breaker body 1. Then, screws are inserted into the inside of both sides for tightening and limiting.

[0030] The metal support frame 24 is made of aluminum alloy or stainless steel and is set inside the inner layer 23. It is equivalent to the load-bearing wall inside the circuit breaker body 1. It can ensure that even if the outer shell of the circuit breaker body 1 softens slightly due to high temperature, the overall structure of the circuit breaker body 1 will not deform or collapse, thus ensuring the overall safety of the circuit breaker body 1.

[0031] The metal support frame 24 is responsible for improving the overall mechanical strength of the circuit breaker body 1, while the filling layer 22 between the outer layer 21 and the inner layer 23 is responsible for heat insulation.

[0032] In addition, the interior of the circuit breaker body 1 is usually equipped with components such as an arc-extinguishing chamber, stationary contacts, moving contacts and contact arms, and operating mechanism. Generally, the stationary contacts, moving contacts and contact arms, as well as the entrance area of ​​the arc-extinguishing chamber are the areas with the most concentrated heat generation and the highest temperature, while the operating mechanism, thermal trip unit, and electromagnetic trip unit usually do not generate a large amount of continuous heat.

[0033] A uniform heat dissipation mechanism 3 is provided inside the circuit breaker body 1. The uniform heat dissipation mechanism 3 is set as a cavity. The uniform heat dissipation mechanism 3 includes a flow guide box 31 that is fixedly installed on the upper side of the circuit breaker body 1 by screws. Specifically, round holes are opened on the upper left and right sides of the flow guide box 31. The round holes are horizontally aligned with the threaded holes opened on the upper side of the circuit breaker body 1. Screws are inserted inside the two for fixed connection.

[0034] In addition, the current-conducting box 31 is located in the high-heat area inside the circuit breaker body 1, and the current-conducting box 31 is made of insulating material. The current-conducting box 31 is equivalent to a physical barrier, effectively separating the high-temperature area inside the circuit breaker body 1 from other areas.

[0035] A flow guide pipe 32 is fixedly installed at the upper and lower ends of the middle part of the flow guide box 31. The upper end of the flow guide pipe 32 is tightly connected to a heat dissipation port 34, which is located inside the upper side of the circuit breaker body 1. The lower end of the flow guide pipe 32 is tightly fitted with an air inlet 33, which is located inside the lower side of the circuit breaker body 1.

[0036] That is, the airflow can enter the interior of the guide pipe 32 from the air inlet 33. It also includes an external air source (not shown), which is an air pump. The air outlet of the air pump is connected to the air inlet 33 through a connecting pipe. The connection is made by tightening the thread. To ensure the sealing, the thread is wrapped with Teflon tape or sealant is used. At the same time, the air pump is set on the outside of the box housing the circuit breaker body 1 is installed. After the air pump is started, compressed air can be delivered from the air outlet of the air pump to the interior of the air inlet 33 through the connecting pipe, and then enter the interior of the guide pipe 32.

[0037] Then it enters the interior of the flow guide box 31. It can directly enter the interior of the flow guide box 31 through the shortest path, and can directly cool the interior area of ​​the flow guide box 31. Then the heat in the interior area of ​​the flow guide box 31 can be dissipated from the heat dissipation port 34 connected to the upper end of the flow guide tube 32.

[0038] In addition, the lower inner wall of the guide pipe 32 is provided with vertically equidistant diversion ports 35. Furthermore, the left and right sides of the circuit breaker body 1 are provided with vertically equidistant heat dissipation ports 36. In addition, a one-way valve is provided at the heat dissipation port 36. The flow direction of the one-way valve is from the inside to the outside of the circuit breaker body 1. When the airflow reverses, the one-way valve will automatically close, thereby preventing gas backflow.

[0039] After the airflow enters the guide pipe 32, a diversion port 35 is opened on the lower left and right inner side walls of the guide pipe 32. A small amount of airflow can flow out from the diversion port 35 and flow to the external area of ​​the guide box 31. The heat dissipation airflow can be dissipated through the heat dissipation port 36 opened on the left and right sides inside the circuit breaker body 1.

[0040] In addition, dustproof mesh is installed inside the air inlet 33, heat dissipation vent 1 34 and heat dissipation vent 2 36 for dust prevention.

[0041] The circuit breaker body 1 is divided into two areas by different module systems. An air intake system is installed inside the circuit breaker body 1, which enables uniform heat dissipation inside the circuit breaker body 1, thereby effectively balancing the internal temperature of the circuit breaker body 1, avoiding local overheating, and preventing accelerated aging of insulation materials, plastic parts and electronic components, thus improving the service life of the entire circuit breaker body 1.

[0042] The working principle of this high-temperature molded case circuit breaker is as follows: A double-layer heat insulation mechanism 2 is installed on the outside of the circuit breaker body 1. The circuit breaker body 1 has two layers, an outer layer 21 and an inner layer 23, both made of high-temperature resistant engineering plastic PPS, replacing traditional ordinary engineering plastics. This directly increases the heat deformation temperature of the circuit breaker body 1. A filling layer 22 is installed between the inner and outer layers to effectively prevent external heat from entering the interior of the circuit breaker body 1. Furthermore, a metal support frame 24 is installed inside the inner layer 23. This metal support frame 24 ensures that if the double-layer heat insulation mechanism 2 softens under high-temperature conditions, the circuit breaker body 1 will not deform or collapse. Additionally, a uniform heat dissipation mechanism 3 is installed inside the circuit breaker body 1, dividing the interior into two areas. A single air intake system allows for uniform heat dissipation between the two areas, effectively preventing localized overheating inside the circuit breaker body 1.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high-temperature resistant molded case circuit breaker, characterized in that: Includes a circuit breaker body (1), and a double-layer heat insulation mechanism (2) is provided on the outside of the circuit breaker body (1); The double-layer heat insulation mechanism (2) consists of an outer layer (21), a filling layer (22), an inner layer (23), and a metal support frame (24). The outer layer (21) is located on the outermost side of the circuit breaker body (1). The inner layer (23) is located on the inner side of the outer layer (21). The filling layer (22) is located between the outer layer (21) and the inner layer (23). The outer layer (21), the filling layer (22), and the inner layer (23) together form the outer shell. The metal support frame (24) is located on the inner side of the inner layer (23). The left and right sides of the middle part of the metal support frame (24) are fixedly connected to the middle inner part of the circuit breaker body (1) by screws.

2. The high-temperature molded case circuit breaker according to claim 1, characterized in that, The circuit breaker body (1) is provided with a uniform heat dissipation mechanism (3), which includes a flow guide box (31) that is fixedly installed on the upper side of the inside of the circuit breaker body (1) by screws.

3. A high-temperature molded case circuit breaker according to claim 2, characterized in that, The upper and lower ends of the middle part of the flow guide box (31) are fixedly installed with flow guide pipes (32), and the upper end of the flow guide pipe (32) is tightly connected to a heat dissipation port (34).

4. A high-temperature molded case circuit breaker according to claim 3, characterized in that, The heat dissipation vent (34) is located inside the upper side of the circuit breaker body (1).

5. A high-temperature molded case circuit breaker according to claim 3, characterized in that, The lower end of the guide pipe (32) is closely fitted with an air inlet (33), which is located inside the lower side of the circuit breaker body (1).

6. A high-temperature molded case circuit breaker according to claim 5, characterized in that, The lower inner wall of the guide pipe (32) is provided with diversion ports (35) at equal intervals.

7. A high-temperature molded case circuit breaker according to claim 2, characterized in that, The circuit breaker body (1) has two heat dissipation vents (36) that are vertically and equally spaced on the left and right sides of its interior.

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