Arc extinguishing structure for zero-flashover universal circuit breaker

Abstract

The utility model relates to the technical field of universal circuit breaker components, in particular to an arc extinguishing structure for a zero-flashover universal circuit breaker, which comprises two side plates and a plurality of arc extinguishing grid sheets arranged between the two side plates at equal intervals, and a fixing seat facing the arc extinguishing grid sheets is arranged between the front ends of the two side plates. The fixed seat is provided with a protection part which is used for preventing breakdown after arc extinguishing. According to the utility model, the original arc extinguishing structure is scientifically and rationally improved, the gas production piece is arranged at the head end of the arc extinguishing structure, the structure of the arc striking sheet is changed, and the support piece, the protective net and the cover plate are arranged at the tail end of the arc extinguishing structure, so that gas production arc extinguishing treatment can be carried out on electric arcs at the front arc extinguishing section; and the arc is comprehensively prevented from overflowing from the arc extinguishing structure to break down elements at the rear arc extinguishing section, so that the arc extinguishing treatment effect of the arc extinguishing structure is effectively improved, and the arc extinguishing structure can meet the use requirement of zero flashover.

Description

Technical Field

[0001] The utility model relates to the technical field of universal circuit breaker components, and in particular to a novel arc extinguishing structure designed to improve the breaking capacity of an AC high voltage 1500V universal circuit breaker used in the field of photovoltaic power generation. Background Art

[0002] Universal circuit breakers, also known as frame circuit breakers, are mechanical switchgear that can connect, carry and disconnect currents under normal circuit conditions, and can also connect, carry for a certain time and disconnect currents under specified abnormal circuit conditions. Universal circuit breakers are used to distribute electrical energy and protect circuits and power equipment from overload, undervoltage, short circuit, etc.

[0003] The arc extinguishing structure installed in the previous generation of zero-flyover universal circuit breakers is mainly composed of three parts: side plates, arc extinguishing grids and arc striking plates. The arc generated during the opening and closing process of the circuit breaker will be guided to the arc extinguishing grid for arc extinguishing under the guidance of the arc striking plate. However, this type of arc extinguishing structure has shortcomings in actual use: since a large number of arcs are generated during the opening and closing process of the circuit breaker, and the arc speed is relatively fast, the arc extinguishing grid cannot effectively extinguish the arc. Part of the arc will overflow through the arc extinguishing structure and then continue to move inside the circuit breaker, causing the internal temperature of the circuit breaker to rise abnormally and the problem of component breakdown occurs.

[0004] In view of this, it is particularly important to design and manufacture an arc extinguishing structure with a stable and reliable arc extinguishing process, strong arc extinguishing effect, and the ability to reduce the occurrence of arc breakdown problems, and to apply it in universal circuit breakers. Utility Model Content

[0005] The purpose of the utility model is to propose an arc extinguishing structure for a zero-flyover universal circuit breaker in order to improve the breaking capacity of an AC high voltage AC1500V universal circuit breaker for use in the field of new energy, especially in the field of photovoltaic power generation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An arc extinguishing structure for a zero-flyover universal circuit breaker comprises two side plates and a plurality of arc extinguishing grids installed at equal intervals between the two side plates, a fixing seat facing the plurality of arc extinguishing grids is installed between the front ends of the two side plates, a protective portion for preventing breakdown after arc extinguishing is arranged on the fixing seat, and an arc extinguishing portion for air blocking and gas pressurization treatment in the arc entrance area is arranged between the rear ends of the two side plates.

[0008] As a further description of the above technical solution:

[0009] The protection part comprises a support member movably mounted inside a fixing seat and buckled with the tails of a plurality of arc-extinguishing grid pieces, a cover plate mounted at the front end of the fixing seat and covering the support member, and a protection net mounted between the cover plate and the support member.

[0010] As a further description of the above technical solution:

[0011] The protective net is formed by welding a large-hole wire mesh and a small-hole wire mesh distributed up and down.

[0012] As a further description of the above technical solution:

[0013] The front end of the cover plate is provided with a plurality of ventilation holes facing the large-pore wire mesh and the small-pore wire mesh respectively.

[0014] As a further description of the above technical solution:

[0015] A plurality of inner buckling grooves for accommodating the tails of the arc-extinguishing grids are integrally formed on one end of the support member facing the plurality of arc-extinguishing grids.

[0016] As a further description of the above technical solution:

[0017] The arc extinguishing part comprises an arc-starting piece installed between the upper ends of two side plates and with the rear end bent downward to form a V-shaped structure, and a gas-generating piece symmetrically installed on the inner sides of the two side plates and abutting against a plurality of arc extinguishing grids.

[0018] As a further description of the above technical solution:

[0019] A stopper abutting against the arc-starting piece and the two gas-generating parts is installed between the two side plates.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] In the utility model, the original arc extinguishing structure is scientifically and rationally improved, a gas-producing component is installed at the head end of the arc extinguishing structure and the structure of the arc-striking plate is changed, and a support component, a protective net and a cover plate are arranged at the tail end of the arc extinguishing structure. By bending the rear end of the arc-striking plate downward into a V-shaped structure, the entrance area of ​​the arc extinguishing structure can be gas-blocked, and the gas-producing component generates arc-extinguishing gas under high-temperature gas pressure to enhance the pressure in the cavity so as to blow the arc into the arc-extinguishing grid. Finally, the support component, the protective net and the cover plate behind the arc-extinguishing grid can block the arc in layers and extinguish the arc, preventing the arc from overflowing the working area of ​​the arc extinguishing structure. This structure can perform gas-producing arc-extinguishing treatment on the arc in the front stage of arc extinguishing, and comprehensively prevent the arc from overflowing from the arc extinguishing structure and breaking through the components in the rear stage of arc extinguishing, effectively improving the arc extinguishing effect of the arc extinguishing structure, and enabling the arc extinguishing structure to meet the use requirements of zero arcing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional front left view schematic diagram of an arc extinguishing structure for a zero-flyover universal circuit breaker proposed by the utility model;

[0023] Figure 2 It is a three-dimensional rear view schematic diagram of the utility model;

[0024] Figure 3 It is a three-dimensional disassembly schematic diagram of the utility model;

[0025] Figure 4 It is a three-dimensional explosion schematic diagram of the utility model.

[0026] Legend:

[0027] 1. Cover plate; 101. Ventilation hole; 2. Protective net; 201. Large-hole wire mesh; 202. Small-hole wire mesh; 3. Support member; 4. Fixed seat; 5. Arc-extinguishing grid; 6. Side plate; 7. Stopper; 8. Gas-generating member; 9. Arc-starting plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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.

[0029] See also Figure 1-4 The utility model provides a technical solution: an arc extinguishing structure for a zero-flyover universal circuit breaker, comprising two side plates 6 and a plurality of arc extinguishing grids 5 installed between the two side plates 6 at equal intervals, a fixing seat 4 facing the plurality of arc extinguishing grids 5 is installed between the front ends of the two side plates 6, a protective portion for preventing breakdown after arc extinguishing is arranged on the fixing seat 4, an arc extinguishing portion for air blocking and gas pressurization treatment in the arc entrance area is arranged between the rear ends of the two side plates 6, wherein the plurality of arc extinguishing grids 5 mainly play the role of quickly extinguishing and cooling the arc.

[0030] Specifically, Figure 1-4 As shown, the protection part includes a support member 3 movably installed on the inner side of the fixing seat 4 and engaged with the tail ends of multiple arc-extinguishing grids 5, a cover plate 1 installed at the front end of the fixing seat 4 and covering the support member 3, and a protection net 2 installed between the cover plate 1 and the support member 3. The protection net 2 is welded together by a large-hole wire mesh 201 and a small-hole wire mesh 202 distributed up and down. The design of the structure of the protection net 2 can, on the one hand, reduce the arcing distance, and on the other hand, prevent foreign particles from entering the arc-extinguishing structure. The setting of the cover plate 1 mainly plays the role of fixing the support member 3 and the protection net 2, and at the same time facilitates the exhaust and ventilation operation at the tail end of the arc-extinguishing structure.

[0031] The front end of the cover plate 1 is provided with a plurality of ventilation holes 101 facing the large-hole wire mesh 201 and the small-hole wire mesh 202 respectively, so as to facilitate ventilation inside and outside the arc extinguishing structure, thereby accelerating the heat dissipation of the arc extinguishing structure.

[0032] At the same time, a plurality of inner buckling grooves for accommodating the tails of the arc-extinguishing grids 5 are integrally formed at one end of the support member 3 facing the plurality of arc-extinguishing grids 5. On the one hand, the contact area between the support member 3 and the arc-extinguishing grids 5 can be increased, thereby improving the stability of the support member 3 and the arc-extinguishing grids 5 after they are combined. On the other hand, a barrier can be formed to prevent the arc from continuing to move, thereby improving the effect of the arc-extinguishing structure in extinguishing the arc and playing a role in preventing arc breakdown.

[0033] Specifically, Figure 1-4 As shown, the arc extinguishing part includes an arc-striking plate 9 installed between the upper ends of the two side plates 6 and with the rear end bent downward to form a V-shaped structure, and a gas-producing part 8 symmetrically installed on the inner sides of the two side plates 6 and abutting against multiple arc-extinguishing grid plates 5. A stopper 7 abutting against the arc-striking plate 9 and the two gas-producing parts 8 is installed between the two side plates 6, which is mainly used for structural reinforcement of the arc-striking plate 9 and the gas-producing part 8 to prevent the arc-striking plate 9 or the gas-producing part 8 from shaking and making abnormal noises due to the force applied to the arc-striking plate 9 or the gas-producing part 8 in the arc-extinguishing structure.

[0034] Working principle: During the actual opening and closing process of the universal circuit breaker, the arc generated by the moving contact and the static contact will be guided into the arc extinguishing structure through the arc-striking piece 9. Due to the high temperature of the arc, it will contact the gas-producing part 8 when entering the entrance area of ​​the arc extinguishing structure. The gas-producing part 8 generates arc extinguishing gas under high temperature pressure and enhances the pressure in the cavity of the arc extinguishing structure, so as to blow the arc into between multiple arc extinguishing grids 5 for arc extinguishing. The arc escaping from the cavities between the multiple arc extinguishing grids 5 will continue to move backward. During this process, the flying arc can contact the support part 3, the protective net 2 and the cover plate 1 in turn, thereby comprehensively preventing the arc from overflowing the working area of ​​the arc extinguishing structure, and realizing zero flying arc extinguishing during the arc extinguishing process.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An arc extinguishing structure for a zero-flashover universal circuit breaker, comprising two side plates (6) and a plurality of arc extinguishing grids (5) installed between the two side plates (6) at equal intervals, characterized in that: A fixing seat (4) facing a plurality of arc extinguishing grids (5) is installed between the front ends of the two side plates (6), a protective portion for preventing breakdown after arc extinguishing is provided on the fixing seat (4), and an arc extinguishing portion for air blocking and gas pressurization treatment in the arc entrance area is provided between the rear ends of the two side plates (6).

2. The arc extinguishing structure for a zero-flashover universal circuit breaker according to claim 1, characterized in that: The protection part comprises a support member (3) movably mounted on the inner side of a fixing seat (4) and engaged with the tails of a plurality of arc-extinguishing grids (5), a cover plate (1) mounted on the front end of the fixing seat (4) and covering the support member (3), and a protection net (2) mounted between the cover plate (1) and the support member (3).

3. The arc extinguishing structure for a zero-flyover universal circuit breaker according to claim 2, characterized in that: The protective net (2) is formed by welding a large-hole wire mesh (201) and a small-hole wire mesh (202) distributed up and down.

4. The arc extinguishing structure for a zero-flyover universal circuit breaker according to claim 3, characterized in that: The front end of the cover plate (1) is provided with a plurality of ventilation holes (101) facing the large-pore wire mesh (201) and the small-pore wire mesh (202) respectively.

5. The arc extinguishing structure for a zero-flyover universal circuit breaker according to claim 2, characterized in that: A plurality of inner buckling grooves for accommodating the tails of the arc-extinguishing grids (5) are integrally formed at one end of the support member (3) facing the plurality of arc-extinguishing grids (5).

6. The arc extinguishing structure for a zero-flashover universal circuit breaker according to claim 1, characterized in that: The arc extinguishing portion comprises an arc striking piece (9) installed between the upper ends of two side plates (6) and with its rear end bent downward to form a V-shaped structure, and a gas producing piece (8) symmetrically installed on the inner sides of the two side plates (6) and abutting against a plurality of arc extinguishing grid pieces (5).

7. The arc extinguishing structure for a zero-flyover universal circuit breaker according to claim 6, characterized in that: A stopper (7) abutting against an arc-starting sheet (9) and two gas-generating parts (8) is installed between the two side plates (6).

Images