Dust cover of low-voltage circuit breaker

Abstract

The utility model relates to a dust cover of a low-voltage circuit breaker, which belongs to the technical field of circuit breakers and comprises a cover body, a plurality of accommodating cavities are arranged on the upper end face of the cover body at intervals, and a limiting part is arranged on one side of each accommodating cavity; the cover plates are located above the containing cavity and rotationally connected with the cover body, each cover plate comprises a lap joint part, a rotating part and a dustproof part which are sequentially connected, and when the lap joint parts abut against the limiting parts, the cover plates are in the closed state, and when the rotating parts abut against the limiting parts, the limiting parts play a role in limiting the rotating strokes of the cover plates. According to the utility model, the cover plate is closed when the lap joint part abuts against the limiting part, and the rotation stroke is limited when the rotation part abuts against the limiting part, so that opening and closing operation of the cover plate is facilitated, good protection performance of the dust cover in a closed state can be ensured, foreign matters such as dust are prevented from entering the low-voltage circuit breaker, and the service life of the low-voltage circuit breaker is prolonged. And meanwhile, damage or protection failure caused by excessive rotation of the cover plate is also avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, concretely relates to a dust cover of low voltage circuit breaker. BACKGROUND

[0002] Low voltage frame circuit breaker is a kind of electrical equipment for making and breaking current, wherein the current includes overload current, breaking short-circuit current and the like. In addition to the function of making and breaking in the circuit, low voltage frame circuit breaker also has certain protection function, such as overload protection, short-circuit protection, under-voltage protection and leakage protection and the like. With the market demand, nowadays, the circuit breaker is used in new energy field more and more widely, such as photovoltaic field, wind power field and the like. Compared with traditional use environment, the environmental adaptability of circuit breaker in new energy field has more stringent requirements. The traditional circuit breaker is used in good environment, so it is weak in dustproof ability. But in some harsh environment, to avoid that metal particles, sand and other particles fall into the circuit breaker and cause the circuit breaker to not operate reliably, how to prevent particles from falling into the circuit breaker becomes crucial.

[0003] Patent CN204441208U discloses a circuit breaker with dust cover arranged on drawer base end heat dissipation seat, the dust cover includes an upper top surface, a front blocking surface and side blocking surfaces arranged on both sides, the side blocking surface is connected with a connecting strip bent inward, a connecting hole is arranged on the connecting strip, and a bolt is arranged to connect the dust cover on the circuit breaker body through the connecting hole. However, the dust cover has simple structure and only covers simply, which cannot effectively prevent dust from entering from the gap, so that dust accumulates in the circuit breaker, affects normal heat dissipation and electrical performance, and further reduces the service life and reliability of the equipment. In addition, the opening and closing design of some existing dust covers is unreasonable, either inconvenient to operate or easy to be damaged in the opening and closing process, and lacks effective limiting structure, so that the cover plate may be excessively rotated and fall off, affecting the protection effect. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming at least one of the defects of the prior art, and provides a dust cover for low voltage circuit breaker, which can prevent dust and other foreign matters from entering the low voltage circuit breaker, and avoid damage or protection failure caused by excessive rotation of the cover plate.

[0005] The utility model can achieve the purpose by the following technical scheme.

[0006] A dust cover for low voltage circuit breaker, comprising:

[0007] A cover body, a plurality of accommodating cavities are arranged at the upper end face of the cover body in intervals, and a limiting portion is arranged on one side of the accommodating cavity.

[0008] A plurality of cover plates are arranged above the accommodating cavities and are rotationally connected with the cover body, and the cover plate comprises a lap joint portion, a rotation portion and a dustproof portion which are sequentially connected, the cover plate is in a closed state when the lap joint portion abuts against the limiting portion, and the limiting portion functions to limit the rotation stroke of the cover plate when the rotation portion abuts against the limiting portion.

[0009] Further, when the cover plate is in the closed state, there is a gap between the rotation portion and the limiting portion, and the gap between the rotation portion and the limiting portion in the closed state of the cover plate makes the cover plate not be affected by the flexibility of rotation due to direct contact and friction with the limiting portion during the opening and closing process.

[0010] Further, the rotation amplitude of the cover plate is denoted as α, and 0≤α<90°.

[0011] Further, a groove is arranged between two adjacent accommodating cavities.

[0012] Further, a positioning partition plate is arranged at the back of the groove.

[0013] Further, the rotation portion is provided with a pair of connecting holes, and a pair of bosses are arranged in the accommodating cavity and respectively extend into the pair of connecting holes.

[0014] Further, the dustproof portion is further provided with a gas permeable hole, and a gas permeable film is arranged on the gas permeable hole.

[0015] Further, the gas permeable hole is a plurality of and is uniformly distributed on the dustproof portion.

[0016] Further, the gas permeable hole is a transverse waist-shaped hole.

[0017] Further, a pre-tightening portion is arranged on the side of the dustproof portion close to the accommodating cavity, and the pre-tightening portion abuts against the inner wall of the accommodating cavity.

[0018] Compared with the prior art, the dust cover of the low-voltage circuit breaker is closed when the lap joint portion abuts against the limiting portion, and the rotation stroke is limited when the rotation portion abuts against the limiting portion, so that the opening and closing operation of the cover plate is facilitated, the dust cover has good protection performance in the closed state, dust and other foreign matters are prevented from entering the low-voltage circuit breaker, and damage or protection failure caused by excessive rotation of the cover plate is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic view of the dust cover of the low-voltage circuit breaker in the embodiment;

[0020] Figure 2 It is a top view of the cover body in the embodiment;

[0021] Figure 3 is a schematic view of the cover plate in the embodiment;

[0022] Figure 4 is a side sectional view of the dust cover of the low-voltage circuit breaker in the embodiment;

[0023] The reference signs in the figure: 1-cover body; 105-accommodation cavity; 104-limiting part; 2-cover plate; 204-overlapping part; 205-rotating part; 206-dustproof part; 102-groove; 103-positioning partition; 201-connecting hole; 101-convex part; 202-vent hole; 203-pre-tightening part. DETAILED DESCRIPTION

[0024] The utility model will be explained in detail below in combination with the drawings and specific embodiments. The embodiment is implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.

[0025] EMBODIMENT

[0026] The embodiment provides a dust cover of a low-voltage circuit breaker, and specific structures are shown in Figures 1-4 , comprising a cover body 1 and a plurality of cover plates 2; a plurality of accommodation cavities 105 are arranged at intervals on the upper end face of the cover body 1, and a limiting part 104 is arranged on one side of the accommodation cavity 105; a plurality of cover plates 2 are located above the accommodation cavities 105 and are rotationally connected with the cover body 1, the cover plate 2 comprises an overlapping part 204, a rotating part 205 and a dustproof part 206 connected in sequence, when the overlapping part 204 abuts against the limiting part 104, the cover plate 2 is in a closed state, and when the rotating part 205 abuts against the limiting part 104, the limiting part 104 plays a role in limiting the rotating stroke of the cover plate 2.

[0027] In the embodiment, when the cover plate 2 is in the closed state, there is a gap between the rotating part 205 and the limiting part 104, and this design makes the cover plate 2 not affect the flexibility of rotation in the opening and closing process due to direct contact and friction with the limiting part 104.

[0028] In the embodiment, the rotating amplitude of the cover plate 2 is denoted as α, and 0≤α<90°, the embodiment specifies the rotating amplitude of the cover plate, when an electric arc is sprayed out, the cover plate 2 rotates around the convex part 101 on the cover body 1, and then returns to the original position by its own gravity, thereby playing a dustproof role; in addition, safety hazards possibly caused by too large rotating amplitude are avoided, for example, the cover plate 2 is prevented from being excessively opened and falling off or affecting the normal use of the low-voltage circuit breaker under accidental conditions, and the protection function of the dust cover under different opening and closing states is also ensured.

[0029] In the embodiment, a groove 102 is arranged between two adjacent accommodating cavities 105, facilitating installation of a phase spacing plate and increasing insulation of the circuit breaker.

[0030] In the embodiment, the back of the groove 102 is provided with a positioning spacing plate 103, which effectively prevents phase-to-phase short circuit.

[0031] In the embodiment, the rotating part 205 is provided with a pair of connecting holes 201, and the accommodating cavity 105 is provided with a pair of protrusions 101, which respectively extend into the pair of connecting holes 201.

[0032] In the embodiment, the dustproof part 206 is further provided with a gas permeable hole 202, which is covered with a gas permeable film. The gas permeable film can be made of polytetrafluoroethylene or coated fabric, or other materials with gas permeability. The gas permeable hole 202 not only ensures the dustproof function of the dust cover, but also realizes certain ventilation effect, which helps to dissipate heat of the low-voltage circuit breaker during operation and avoids affecting the performance and service life of the equipment due to heat accumulation.

[0033] In the embodiment, the gas permeable hole 202 is multiple and uniformly distributed on the dustproof part 206; and the gas permeable hole 202 is a transverse waist-shaped hole.

[0034] In the embodiment, the dustproof part 206 is provided with a pre-tightening part 203 on the side close to the accommodating cavity 105, which abuts against the inner wall of the accommodating cavity 105. This design further improves the sealing performance of the dust cover in the closed state, which can more effectively prevent dust, moisture and the like from entering the low-voltage circuit breaker and protect normal operation of the equipment.

[0035] Working principle:

[0036] The cover plate 2 of the dust cover is installed on the cover body 1 through the connecting hole 201, and is flexibly rotated by the protrusion 101 of the cover body 1. When the electric arc is ejected, the cover plate 2 is rotated, and is reset by its own gravity after the electric arc, so as to achieve the dustproof purpose. The groove 102 of the cover body 1 facilitates installation of a phase spacing plate, which together with the positioning spacing plate 103 improves insulation and prevents phase-to-phase short circuit. The limiting part 104 of the cover body 1 limits the cover plate 2, avoiding overstroke during movement. The gas permeable hole 202 on the cover plate 2 effectively reduces the temperature rise of the circuit breaker through gas permeation and heat dissipation.

[0037] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in other forms, and any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution of the present application, and in accordance with the technical essence of the present application, still belong to the protection scope of the technical solution of the present application.

Claims

1. A dust cover for a low voltage circuit breaker, characterized in that The utility model relates to a dustproof cover, including: A cover body (1) is provided with a plurality of accommodation cavities (105) on the upper end face, and a limiting portion (104) is arranged on one side of the accommodation cavity (105); A plurality of cover plates (2) are located above the accommodation cavities (105) and are rotationally connected with the cover body (1), the cover plate (2) includes a lap joint portion (204), a rotating portion (205) and a dustproof portion (206) connected in sequence, when the lap joint portion (204) abuts against the limiting portion (104), the cover plate (2) is in a closed state, when the rotating portion (205) abuts against the limiting portion (104), the limiting portion (104) plays a role in limiting the rotating stroke of the cover plate (2).

2. A dust shield for a low voltage circuit breaker according to claim 1, characterized in that When the cover plate (2) is in a closed state, there is a gap between the rotating portion (205) and the limiting portion (104).

3. A dust shield for a low voltage circuit breaker according to claim 1, wherein The rotating amplitude of the cover plate (2) is recorded as alpha, and 0 <= alpha < 90 degrees.

4. The dust shield for a low voltage circuit breaker of claim 1, wherein, A groove (102) is arranged between adjacent two accommodation cavities (105).

5. A dust shield for a low voltage circuit breaker according to claim 4, wherein, The back of the groove (102) is provided with a positioning partition plate (103).

6. The dust shield for a low voltage circuit breaker of claim 1, wherein, The rotating portion (205) is provided with a pair of connecting holes (201), and the accommodation cavity (105) is provided with a pair of bosses (101), and the pair of bosses (101) respectively extend into the pair of connecting holes (201).

7. The dust shield for a low voltage circuit breaker of claim 1, wherein, The dustproof portion (206) is further provided with a breathable hole (202), and the breathable hole (202) is covered with a layer of breathable film.

8. A dust shield for a low voltage circuit breaker according to claim 7, characterized in that The breathable hole (202) is multiple and uniformly distributed on the dustproof portion (206).

9. A dust shield for a low voltage circuit breaker according to claim 7, wherein, The breathable hole (202) is a transverse waist type hole.

10. The dust cover for a low voltage circuit breaker of claim 1, wherein, The dustproof portion (206) is provided with a pre-tightening portion (203) on the side close to the accommodation cavity (105), and the pre-tightening portion (203) abuts against the inner wall of the accommodation cavity (105).

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