Plastic housing circuit breaker

Abstract

The utility model discloses a plastic shell formula circuit breaker belongs to low pressure electric appliance technical field, including plastic shell, heat dissipation mechanism and adjusting mechanism, the heat dissipation mechanism includes the heat dissipation net of being fixed by stud and the spring that pops out the heat dissipation net through push board after the dismounting stud, the adjusting mechanism includes fixed block and makes the fixed block can slide in the sliding rail of the top of plastic shell sliding block, and the fixed block is locked through the lock of clamping hook and clamping groove. The utility model through above -mentioned cooperation and work heat dissipation mechanism and adjusting mechanism, reached the convenient user quick dismouting heat dissipation net to guarantee long -term heat dissipation effect, and can accurate adjustment circuit breaker position after installation, improve the beneficial effect of installation efficiency and precision.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to plastic-cased circuit breakers. Background Technology

[0002] Molded case circuit breakers are widely used electrical protection components in low-voltage power distribution systems. They are used to carry and interrupt normal operating current and reliably disconnect the circuit in the event of overload or short-circuit faults to protect lines and electrical equipment. When a molded case circuit breaker carries a large current for a long time, the internal conductive parts and tripping mechanism will generate heat due to their own resistance. Excessive internal temperature will seriously affect the stability of the circuit breaker's operation, causing the tripping characteristics to drift and even accelerating the aging of the insulation material, thereby shortening the overall service life of the circuit breaker.

[0003] To address the aforementioned overheating issues, some existing plastic-cased circuit breakers incorporate heat dissipation structures on their housings, such as ventilation holes or heat dissipation meshes. While these structures initially provide some auxiliary cooling, prolonged use in industrial environments allows dust, oil, and other impurities in the air to gradually adhere to and clog these ventilation holes or meshes, resulting in a significant decrease in heat dissipation efficiency. This causes the internal temperature of the circuit breaker to rise again, defeating the original purpose of the heat dissipation design. Furthermore, these heat dissipation structures are integrally molded with or tightly connected to the circuit breaker housing, making it difficult for users to effectively clean or replace them without disassembling the entire circuit breaker. This poses a significant challenge to the daily maintenance of the equipment.

[0004] In addition, multiple circuit breakers need to be installed side by side on the mounting plate of the distribution cabinet and fixed with screws during installation. Due to the manufacturing tolerances of the circuit breakers themselves, it is difficult to align the multiple circuit breakers precisely after installation, which affects the aesthetics of the overall layout. Once the circuit breakers are fixed with screws, their positions cannot be fine-tuned, which brings inconvenience to occasions that require high-precision installation.

[0005] Therefore, this utility model proposes a plastic-cased circuit breaker to address the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems of existing plastic-cased circuit breakers, such as the difficulty in cleaning and maintaining the heat dissipation structure after dust accumulation and the inconvenience of installation due to the inability to fine-tune the position after installation, this utility model aims to provide a plastic-cased circuit breaker with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a plastic-cased circuit breaker, including: a plastic casing, a heat dissipation mechanism, and an adjustment mechanism.

[0008] The heat dissipation mechanism includes a heat dissipation mesh installed in a heat dissipation groove on the inner wall of the plastic shell. A spring is fixedly connected to the inner wall of the plastic shell. The spring is connected to a push plate to abut against the heat dissipation mesh. A reinforcing ring is fixedly connected to the heat dissipation mesh.

[0009] Furthermore, the adjustment mechanism includes a sliding rail fixedly connected to the top of the plastic shell and a fixed block with a sliding block fixedly connected to the bottom. The sliding block is slidably disposed in the sliding rail. The heat dissipation mesh is threadedly connected to the plastic shell through a stud passing through the positioning hole. The hook connected to the fixed block is adapted to engage with the slot opened on the top of the plastic shell.

[0010] Preferably, one end of the spring is fixedly connected to the inner wall of the plastic shell, and the other end of the spring is fixedly connected to the push plate.

[0011] Preferably, the reinforcing ring is fixedly connected to the side of the heat dissipation mesh away from the push plate.

[0012] Preferably, the push plate and the heat dissipation mesh are in a separable contact.

[0013] Preferably, the hook is rotatably connected to the outer wall of the fixed block.

[0014] Preferably, the plastic-cased circuit breaker also includes a heat dissipation mechanism, with two heat dissipation mechanisms respectively disposed on opposite sides of the plastic casing.

[0015] Preferably, the plastic-cased circuit breaker also includes fixing blocks, with two fixing blocks symmetrically arranged on the top of the plastic casing.

[0016] Preferably, the fixing block is provided with mounting holes for fixing the fixing block to the mounting surface.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problem of difficulty in cleaning and maintaining the heat dissipation mesh of circuit breakers after dust accumulation by setting a heat dissipation mechanism composed of springs, push plates and detachable heat dissipation mesh. It facilitates users to quickly disassemble and install the heat dissipation mesh, ensures the long-term heat dissipation effect of the circuit breaker, and improves product reliability and service life.

[0018] 2. This utility model solves the problem in the prior art where the position of the circuit breaker is fixed after installation, making it difficult to make fine adjustments and resulting in low alignment accuracy when installed side by side. It enables convenient adjustment of the horizontal position of the circuit breaker after fixed installation, thereby improving installation efficiency and accuracy. Attached Figure Description

[0019] Figure 1 This is a perspective view of the plastic-cased circuit breaker proposed in this utility model; Figure 2 This is a front view of the plastic-cased circuit breaker proposed in this utility model; Figure 3 This is an exploded view of the heat dissipation mechanism of the plastic-cased circuit breaker proposed in this utility model; Figure 4 This is an exploded view of the adjustment mechanism of the plastic-cased circuit breaker proposed in this utility model.

[0020] Legend: 1. Plastic shell; 2. Heat dissipation mechanism; 201. Heat dissipation mesh; 202. Positioning hole; 203. Reinforcing ring; 204. Stud; 205. Spring; 206. Push plate; 207. Heat dissipation groove; 3. Adjustment mechanism; 301. Fixing block; 302. Sliding block; 303. Sliding rail; 304. Hook; 305. Slot. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in 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 a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0022] Example: Please refer to Figures 1 to 4 This utility model provides a plastic-cased circuit breaker, which aims to solve the problems of inconvenient maintenance of the heat dissipation structure and difficulty in precise adjustment of the position during installation of the existing plastic-cased circuit breaker.

[0023] like Figure 1 and Figure 2 As shown, the plastic-cased circuit breaker includes a plastic casing 1 as the main frame, heat dissipation mechanisms 2 respectively disposed on opposite sides of the plastic casing 1, and adjustment mechanism 3 disposed on the top of the plastic casing 1. The plastic casing 1 provides housing space and protection for the internal circuit components, and at the same time provides an installation reference for the heat dissipation mechanism 2 and the adjustment mechanism 3.

[0024] like Figure 3As shown, heat dissipation grooves 207 are respectively provided on the inner walls of both sides of the plastic shell 1. Multiple springs 205 are fixedly connected inside the heat dissipation grooves 207. One end of each spring 205 is fixed to the inner wall of the plastic shell 1, and the other end is fixedly connected to the push plate 206. Each heat dissipation mechanism 2 also includes a heat dissipation mesh 201 that can be detachably installed in the heat dissipation groove 207. Multiple positioning holes 202 are provided on the heat dissipation mesh 201. Multiple studs 204 pass through the positioning holes 202 in sequence and are threaded to the inner wall of the plastic shell 1, thereby fastening the heat dissipation mesh 201 in the heat dissipation groove 207. At this time, the push plate 206 forms a separable abutment contact with the inner surface of the heat dissipation mesh 201 under the pre-tightening force of the springs 205. A reinforcing ring 203 is also fixedly connected to the edge of the heat dissipation mesh 201 on the side away from the push plate 206.

[0025] like Figure 4 As shown, the adjustment mechanism 3 is located on the top of the plastic shell 1. A sliding rail 303 is fixedly connected to the top of the plastic shell 1, and a slot 305 is provided near the sliding rail 303. The adjustment mechanism 3 includes multiple fixing blocks 301. A sliding block 302 is fixedly connected to the bottom of each fixing block 301. The sliding block 302 is slidably fitted inside the sliding rail 303. A hook 304 is also rotatably connected to the outer wall of each fixing block 301. The hook structure of the hook 304 is adapted to the slot structure of the slot 305 to achieve locking.

[0026] Please refer to Figure 3 One end of the spring 205 of the heat dissipation mechanism 2 is fixedly connected to the inner wall of the plastic shell 1, and the other end of the spring 205 is fixedly connected to the push plate 206. In the installed state, the push plate 206 forms a separable abutment contact with the inner surface of the heat dissipation mesh 201. During disassembly, the spring 205 can automatically push the heat dissipation mesh 201 out of the heat dissipation groove 207 through the push plate 206. The heat dissipation mesh 201 is threadedly connected to the plastic shell 1 through the stud 204 passing through the positioning hole 202, thus being fastened within the heat dissipation groove 207. A reinforcing ring 203 is also fixedly connected to the side of the heat dissipation mesh 201 away from the push plate 206. The reinforcing ring 203 provides structural support for the heat dissipation mesh 201, preventing deformation during disassembly and assembly. Please refer to Figure 4 The core of the adjustment mechanism 3 lies in the sliding locking engagement between the fixed block 301 and the plastic shell 1. The bottom of the fixed block 301 is fixedly connected to a sliding block 302. The cross-sectional shape of the sliding block 302 is adapted to the internal cavity of the sliding rail 303 fixedly connected to the top of the plastic shell 1, forming a sliding connection. This provides the plastic shell 1 with the ability to adjust its horizontal position relative to the fixed block 301. At the same time, a hook 304 is rotatably connected to the outer wall of the fixed block 301, and a slot 305 is provided at the corresponding position on the top of the plastic shell 1. By moving the hook 304 to engage or disengage from the slot 305, the locking or unlocking of the above-mentioned horizontal position is achieved.

[0027] As a preferred embodiment, to ensure the stability and reliability of the pop-out function of the heat dissipation mechanism 2, one end of the spring 205 is fixedly connected to the inner wall of the plastic shell 1 by welding or snap-fitting, and the other end of the spring 205 is fixedly connected to the surface of the push plate 206 away from the heat dissipation mesh 201. The push plate 206 and the heat dissipation mesh 201 are in a separable abutment contact. This non-fixed contact method ensures that the heat dissipation mesh 201 can be smoothly separated from the push plate 206 after being pushed out. In order to improve the overall rigidity of the heat dissipation mesh 201 and prevent accidental deformation during disassembly and assembly, the reinforcing ring 203 is fixedly connected to the side of the heat dissipation mesh 201 away from the push plate 206. The reinforcing ring 203 can be an annular protrusion integrally formed on the edge of the heat dissipation mesh 201, or it can be a metal ring that is independently processed and welded onto the heat dissipation mesh 201.

[0028] As another preferred embodiment, to facilitate the user's locking operation of the adjustment mechanism 3 and simplify the installation process, the hook 304 is rotatably connected to the outer wall of the fixing block 301 via a rotating shaft, so that the operator can move the hook 304 by hand without the aid of tools. In order to firmly install the entire circuit breaker on the mounting plate of the distribution cabinet, the fixing block 301 is provided with a mounting hole that penetrates the body. The diameter of the mounting hole is matched with the diameter of the standard mounting screw, which facilitates quick fixing.

[0029] In another preferred embodiment, two heat dissipation mechanisms 2 are respectively arranged on the side walls of opposite sides of the plastic shell 1 to form a symmetrical heat dissipation layout, which is conducive to air convection. Meanwhile, the adjustment mechanism 3 preferably includes multiple fixing blocks 301. Two fixing blocks 301 are symmetrically arranged on the top of the plastic shell 1 and fixed by two distributed mounting points, which can make the entire plastic shell circuit breaker more evenly stressed and more stable and reliable after installation.

[0030] Working Principle: During operation, the heat generated by the internal circuit components of the circuit breaker is dissipated to the external environment through two heat dissipation mechanisms 2 located on opposite sides of the plastic housing 1. The heat dissipation mesh 201 in the heat dissipation mechanism 2 provides a heat dissipation channel while effectively preventing larger dust particles from entering the plastic housing 1, thus protecting the internal circuit components. When cleaning or replacing the heat dissipation mesh 201 that has accumulated dust over long-term use, first unscrew and remove the multiple studs 204 used to fix the heat dissipation mesh 201 from the plastic housing 1. At this time, because the axial binding force applied to the heat dissipation mesh 201 disappears, the spring 205, which was compressed by the push plate 206 driven by the heat dissipation mesh 201 during installation, releases its stored elastic potential energy. The spring 205 pushes the fixedly connected push plate 206 outward, thereby dissipating heat through the push plate 206. The heat dissipation mesh 201 is smoothly pushed out of the heat dissipation groove 207 of the plastic shell 1. Since the reinforcing ring 203 is fixedly connected to the heat dissipation mesh 201, it provides sufficient structural strength for the heat dissipation mesh 201 during the entire pushing and subsequent operation process, preventing bending or damage. After replacement or cleaning, the new or clean heat dissipation mesh 201 is aligned with the heat dissipation groove 207 and pressed in. During the pressing process, the inner side of the heat dissipation mesh 201 will abut against the push plate 206 and drive the push plate 206 to move into the plastic shell 1, thereby compressing the spring 205 again, preparing for the next automatic pop-out. Finally, the stud 204 is re-passed through the positioning hole 202 of the heat dissipation mesh 201 and threaded to the plastic shell 1, thus completing the installation and fixing of the heat dissipation mesh 201. Through the synergistic action of the heat dissipation mechanism 2, the problem of difficult cleaning and poor maintainability of the heat dissipation components of the existing circuit breaker after dust accumulation is solved. When installing a molded case circuit breaker, the operator securely fixes the two fixing blocks 301, located on top of the molded case 1, to the mounting surface of the distribution cabinet by passing screws through the mounting holes on the fixing blocks 301. When it is necessary to fine-tune the horizontal position of the molded case 1 to achieve precise alignment of multiple circuit breakers, the operator can manually rotate the hooks 304 connected to the outer wall of the fixing blocks 301, causing the hooks 304 to disengage from the slots 305 on the top of the molded case 1, thereby releasing the positional restriction of the fixing blocks 301 relative to the molded case 1. After the restriction is released, since the bottom of the fixing blocks 301 is fixedly connected to the sliding blocks 302, the sliding blocks 302... Furthermore, the sliding block 302 is slidably engaged within the sliding rail 303 fixedly connected to the top of the plastic shell 1. Therefore, the operator can push the plastic shell 1 left and right, allowing the sliding block 302 to slide freely within the sliding rail 303. This achieves horizontal adjustment of the main body of the plastic shell 1 relative to the fixed block 301. After the plastic shell 1 is adjusted to the ideal position, the hook 304 is reversed and re-engaged into the slot 305, thus firmly locking the fixed block 301 and the plastic shell 1 again to prevent accidental changes. Through the synergistic effect of the adjustment mechanism 3, the problem of fixed installation position of existing circuit breakers, which makes it difficult to accurately align when facing installation errors, affecting installation efficiency and aesthetics, is solved.

Claims

1. A molded case circuit breaker, including a molded case (1); Its features are, It also includes a heat dissipation mechanism (2) and an adjustment mechanism (3). The heat dissipation mechanism (2) includes a heat dissipation mesh (201) installed in a heat dissipation groove (207) opened on the inner wall of the plastic shell (1). A spring (205) is fixedly connected to the inner wall of the plastic shell (1). The spring (205) is connected to a push plate (206) to abut against the heat dissipation mesh (201). The heat dissipation mesh (201) is threaded to the plastic shell (1) through a stud (204) passing through a positioning hole (202). The heat dissipation mesh (201) is fixedly connected with a reinforcing ring (203). The adjustment mechanism (3) includes a sliding rail (303) fixedly connected to the top of the plastic shell (1) and a fixed block (301) fixedly connected to the bottom with a sliding block (302). The sliding block (302) is slidably disposed in the sliding rail (303). The hook (304) connected to the fixed block (301) is adapted to engage with the slot (305) opened on the top of the plastic shell (1).

2. The plastic-cased circuit breaker according to claim 1, characterized in that, One end of the spring (205) is fixedly connected to the inner wall of the plastic shell (1), and the other end of the spring (205) is fixedly connected to the push plate (206).

3. The plastic-cased circuit breaker according to claim 1, characterized in that, The reinforcing ring (203) is fixedly connected to the side of the heat dissipation mesh (201) away from the push plate (206).

4. The plastic-cased circuit breaker according to claim 1, characterized in that, The push plate (206) and the heat dissipation mesh (201) are in separable contact.

5. The plastic-cased circuit breaker according to claim 1, characterized in that, The hook (304) is rotatably connected to the outer wall of the fixing block (301).

6. The plastic-cased circuit breaker according to claim 1, characterized in that, The fixing block (301) is provided with mounting holes for fixing the fixing block (301) to the mounting surface by screws.

7. The plastic-cased circuit breaker according to claim 1, characterized in that, The heat dissipation mechanism (2) includes two parts, which are respectively disposed on opposite sides of the plastic shell (1).

8. The plastic-cased circuit breaker according to claim 1, characterized in that, The adjustment mechanism (3) includes the fixing block (301), and a plurality of the fixing blocks (301) are symmetrically arranged on the top of the plastic shell (1).

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