Circuit breaker with arc extinguishing function

Abstract

The utility model belongs to the technical field of circuit breakers, and particularly relates to a circuit breaker with an arc extinguishing function, which comprises a mounting piece, a cover body, a circuit breaker body and an arc extinguishing component, the mounting piece comprises a box body, the front end of the box body is provided with an opening, the opening end of the box body is rotatably connected with the cover body, the circuit breaker body is fixed in the box body, and the arc extinguishing component is fixed on the circuit breaker body. The circuit breaker comprises a circuit breaker body, an arc extinguishing component is arranged on the circuit breaker body and comprises a sealing box, the sealing box is fixed to the circuit breaker body in a sealed mode, a separating piece is arranged in the sealing box, guide cylinders are horizontally communicated and fixed to the two ends of the sealing box, and a vacuum pump is communicated and fixed to the guide cylinder at one end of the sealing box. According to the utility model, the vacuum pump on the guide cylinder at the other end of the box body is started to drive air in the box body to flow from one end to the other end, the air is in contact with the plurality of arc extinguishing grids, the air flowing at a high speed is utilized to blow electric arcs away from a contact area, cooling is accelerated, a current path is interrupted, and the arc extinguishing effect of the arc extinguishing grids is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of circuit breaker, specifically relates to a circuit breaker with arc extinguishing function. BACKGROUND

[0002] The circuit breaker is a kind of key switch device in power system and electrical equipment, can be closed, carried and broken in normal loop condition, simultaneously, under abnormal loop condition, corresponding operation is executed within the stipulated time to protect the safety of equipment and personnel.When the circuit breaker contact is separated, current can generate high-temperature plasma, i.e.arc, through gradually reducing contact surface.If arc is not controlled, high-temperature arc can cause contact ablation, equipment damage, even cause fire and other safety accidents.

[0003] In prior art, in order to solve arc problem, the patent with announcement number CN212625461U discloses a circuit breaker with arc extinguishing structure.The top wall of the circuit breaker body is provided with arc extinguishing structure near front side, and the arc extinguishing structure includes arc extinguishing cover, multiple arc extinguishing grid sheets and arc guide sheet.The bottom of arc extinguishing grid sheet is provided with arc extinguishing port, and both sides are provided with arc guide block, and the bottom wall of arc guide block is welded with inverted triangular arc guide sheet, arc is transmitted to arc extinguishing grid sheet through arc guide sheet, and arc energy is gradually dispersed and absorbed, so as to inhibit the diffusion of arc in the inside of circuit breaker body, improve the stability and safety of circuit breaker.However, the design mainly realizes arc extinguishing by hindering arc propagation and absorbing energy through arc extinguishing grid sheet, and the temperature of arc extinguishing grid sheet is increased due to absorbing a large amount of heat in working process, and after long time use, its blocking capacity can be reduced, which affects arc extinguishing effect, and even arc extinguishing grid sheet needs to be frequently maintained or replaced.

[0004] In addition, in the arc extinguishing design of traditional circuit breaker, there is lack of systematic treatment of airflow assistance in arc extinguishing process, so that arc cooling efficiency is low, and arc can be retained in contact area, which causes adverse effects on the overall performance of circuit breaker. UTILITY MODEL CONTENTS

[0005] In view of the problems existing in prior art, the utility model aims at providing a kind of circuit breaker with arc extinguishing function, it can be realized, by setting arc extinguishing component and airflow auxiliary device, arc can be quickly transmitted to arc extinguishing grid sheet and high-efficiency cooling is realized with the help of airflow, effectively solve the problems of arc extinguishing effect attenuation and contact damage in traditional design, simultaneously, with higher structural flexibility, applicable to multiple application scenarios.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a circuit breaker with arc extinguishing function, including mounting piece, lid, circuit breaker body and arc extinguishing component, the mounting piece includes box body, the front end opening of box body is arranged, and the opening end of box body is rotationally connected with the lid, the inside of box body is fixed with circuit breaker body, and the arc extinguishing component is arranged on circuit breaker body, the arc extinguishing component includes sealed box, and the inside of sealed box is provided with separating piece, and the both ends of sealed box are fixed with guide cylinder and are communicated, and the guide cylinder of sealed box one end is fixed with vacuum pump and is communicated, and the guide cylinder of sealed box other end is fixed with electromagnetic valve and is communicated.

[0008] Further, the separating piece includes an arc guide plate, which is horizontally arranged in the sealed box, and a plurality of arc guide pins are vertically arranged on the horizontal end face of the arc guide plate close to the side of the circuit breaker contact.

[0009] Further, an arc extinguishing grid is vertically fixed on the other horizontal end face of the arc guide plate, and a plurality of arc extinguishing grid pieces are transversely and vertically fixed on the arc guide plate.

[0010] Further, a plurality of air holes are uniformly and through provided on the arc extinguishing grid, and an arc extinguishing opening is through provided on the other end of the arc extinguishing grid.

[0011] Further, a plurality of grids are vertically fixed on the inner wall of the sealed box, and the grids are horizontally arranged, and the grids are used for vertically inserting and assembling the arc extinguishing grid.

[0012] Further, two guide frames are horizontally and symmetrically fixed on the other end face of the box body, a screw cylinder is horizontally rotationally connected to the middle part of the other end face of the box body, a fixing frame is provided on the guide frame, one end of the fixing frame is fixedly connected through a fixing screw, the other end of the fixing frame is fixed with a sliding block, and the sliding block is slidingly assembled between the two guide frames.

[0013] Further, a screw post is horizontally fixed on the end of the sliding block, and the screw post is screw assembled in the screw cylinder.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] By setting the sealed box and the separating piece, the guide cylinders are communicated at the both ends of the sealed box, the arc is guided to the arc guide plate through the arc guide pins, and then dispersed on the arc extinguishing grid, realizing the rapid guidance and uniform dispersion of the arc. The through air holes and the arc extinguishing opening on the arc extinguishing grid, combined with the airflow guidance in the guide cylinder, can quickly blow and cool the arc away from the contact area, effectively solving the problem of the decline of the arc extinguishing effect of the arc extinguishing grid caused by high temperature in the prior art.

[0016] The combination of the vacuum pump and the electromagnetic valve is used to make the air flow at high speed by establishing an air flow circulation path in the sealed box. The design not only accelerates the cooling of the arc extinguishing grid, but also reduces the damage of the arc retention to the circuit breaker contact, overcomes the defect that the arc extinguishing process of the traditional circuit breaker is time-consuming, and improves the working efficiency and service life of the circuit breaker.

[0017] The structure composed of the guide frame and the sliding block can flexibly adjust the position of the mounting piece through the screw cylinder driving the sliding block to slide horizontally. The design meets the needs of various use scenarios, optimizes the mounting and dismounting mode of the circuit breaker, makes the equipment have high applicability and expansibility, and avoids the problem that the applicable scenarios are limited due to the installation position limitation in the traditional fixed mode. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the overall structure in the disassembled state of the utility model;

[0020] Figure 3 It is a schematic diagram of the structure of the arc extinguishing member in the disassembled state of the utility model;

[0021] Figure 4 It is a schematic diagram of the structure of the separation piece in the disassembled state of the utility model;

[0022] Figure 5 It is a schematic diagram of the structure of the mounting piece in the disassembled state of the utility model.

[0023] In the drawings, the component list represented by each reference sign is as follows:

[0024] 1, mounting piece; 11, box body; 12, guide frame; 13, fixed frame; 14, sliding block; 15, stud; 16, screw cylinder; 17, fixed screw; 2, cover body; 3, circuit breaker body; 4, arc extinguishing member; 41, sealed box; 42, separation piece; 421, arc guide plate; 422, arc extinguishing grid; 423, arc extinguishing port; 424, arc guide needle; 43, guide cylinder; 44, vacuum pump; 45, electromagnetic valve; 46, grid. DETAILED DESCRIPTION

[0025] In order to make the purpose and advantages of the utility model more clear and obvious, the utility model is specifically described below in combination with examples. It should be understood that the following text is only used to describe one or several specific embodiments of the utility model, and does not strictly limit the protection range of the utility model.

[0026] REFERENCE Figures 1-5As shown, a circuit breaker with arc extinguishing function includes a mounting member 1, a cover 2, a circuit breaker body 3 and an arc extinguishing member 4. The mounting member 1 includes a box body 11 made of high-strength engineering plastic, which has excellent insulation and heat resistance. The box body 11 is provided with an open front end, and the open end of the box body 11 is rotatably connected with the cover 2 through a metal hinge. The hinge is made of stainless steel to enhance the stability and corrosion resistance of the connection. The inside of the box body 11 is fixedly installed with the circuit breaker body 3 through bolts. The shell of the circuit breaker body 3 is made of flame-retardant plastic, which has fireproof performance. The circuit breaker body 3 is provided with the arc extinguishing member 4 for arc extinguishing. The arc extinguishing member 4 includes a sealing box 41 made of aluminum alloy material to ensure good sealing and heat dissipation performance. The sealing box 41 is fixedly closed on the circuit breaker body 3 through threads or buckles. The inside of the sealing box 41 is provided with a separation piece 42 for guiding and dispersing the arc. The two ends of the sealing box 41 are fixedly connected with guide cylinders 43 in a horizontal manner. The guide cylinders 43 are made of high-temperature resistant rubber material, which can effectively resist the high-temperature impact of the arc. The one end of the sealing box 41 is fixedly connected with a vacuum pump 44 through the guide cylinder 43. The model of the vacuum pump 44 is VQ-100, which has high efficient air pumping capacity. The other end of the sealing box 41 is fixedly connected with an electromagnetic valve 45 through the guide cylinder 43. The electromagnetic valve 45 is made of aluminum valve body to ensure durability and sealing performance.

[0027] Referring to Figure 3 and Figure 4 As shown, the separation piece 42 includes an arc guiding plate 421, which is horizontally arranged in the inside of the sealing box 41. The arc guiding plate 421 is made of copper material and is silver-plated on the surface to improve the electrical conductivity and oxidation resistance. A plurality of arc guiding needles 424 are vertically arranged on the horizontal end face of the arc guiding plate 421 close to the circuit breaker contact. The diameter of the arc guiding needles 424 is 2mm, which are made of high-temperature resistant alloy material to ensure that the arc can be effectively guided and prevented from breaking. The one end of the plurality of arc guiding needles 424 is fixed on the horizontal end face of the arc guiding plate 421 through welding process.

[0028] Referring to Figure 3 and Figure 4 As shown, the horizontal end face of the other side of the arc guiding plate 421 is fixedly provided with arc extinguishing fins 422. The arc extinguishing fins 422 are composed of a plurality of metal sheets with high thermal conductivity and certain rigidity. The surface of the arc extinguishing fins 422 is coated with a high-temperature resistant ceramic coating to enhance the durability and arc extinguishing effect. The arc extinguishing fins 422 are vertically arranged on the arc guiding plate 421 in a transverse manner, and the spacing is uniform. A plurality of air holes with a diameter of 1mm are uniformly arranged on the arc extinguishing fins 422 for guiding the airflow through the fins to accelerate the cooling and dispersion of the arc. The other end of the arc extinguishing fins 422 is provided with an arc extinguishing opening 423 with a width of 5mm for quickly discharging the arc.

[0029] Referring toFigure 3 and Figure 4 As shown in the figure, the inner wall of the sealing box 41 is vertically fixed with a grid 46 on both sides, which is uniformly spaced in the horizontal direction, with a distance of 10mm between each group, for the vertical insertion assembly of the arc extinguishing grid 422. The grid 46 is made of high-strength heat-resistant plastic, with good insulation performance and structural stability, ensuring the secure installation and quick replacement of the arc extinguishing grid.

[0030] Reference Figure 5 As shown in the figure, the other end surface of the box body 11 is horizontally fixed with two guide frames 12, which are made of stainless steel and have high corrosion resistance and load capacity. The middle part of the other end surface of the box body 11 is horizontally rotationally connected with a screw cylinder 16, which is made of alloy steel and plated with zinc on the surface to prevent rust. The guide frame 12 is provided with a fixed frame 13, the two ends of which are fixedly connected by high-strength screws 17, and the other end of the fixed frame 13 is provided with a sliding block 14, which is assembled between the two guide frames 12 by sliding. The material of the sliding block 14 is engineering plastic, and the copper sliding strip is embedded inside to reduce the friction. The end of the sliding block 14 is fixed with a stud 15, which is made of high-strength stainless steel and is threadedly assembled in the screw cylinder 16. By rotating the screw cylinder 16, the sliding block 14 can be driven to move horizontally along the guide frame 12, realizing the precise adjustment of the fixed frame 13.

[0031] The working principle of the utility model is as follows: when in use, the circuit breaker body 3 is fixed in the box body 11, and then the cover body 2 is used for closed storage. When the circuit breaker body 3 is opened and closed to generate arc, the generated arc is guided by the arc leading needle 424 on the arc guide plate 421 in the separating piece 42 in the arc extinguishing member 4, and is transmitted to the arc guide plate 421. Then the arc is transmitted and dispersed to the multiple arc extinguishing grid pieces 422. In order to dissipate the separated arc, the electromagnetic valve 45 on one end of the guide cylinder 43 is opened, the vacuum pump 44 on the other end of the guide cylinder 43 in the box body 11 is started to drive the air in the box body 11 to flow from one end to the other end. The air contacts the multiple arc extinguishing grid pieces 422, and the high-speed flowing air blows the arc away from the contact area, accelerates the cooling and interrupts the current path, ensuring the arc extinguishing effect of the arc extinguishing grid piece.

[0032] In use, the screw cylinder 16 on one end of the box body 11 can also be rotated according to the use condition, the stud 15 on the sliding block 14 at the end of the fixed frame 13 is driven to move horizontally, and the sliding block 14 at one end of the fixed frame 13 is slid horizontally on the guide frame 12, so as to adjust the installation position of the mounting member 1, ensuring the expansion effectiveness of the installation.

[0033] The above merely describes preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application. Structures, devices and operation methods not specifically described and explained in the present application are implemented according to conventional means in the art, unless otherwise specified and limited.

Claims

1. A circuit breaker with arc extinguishing function, characterized by, The utility model relates to a circuit breaker, including mounting (1), cover (2), circuit breaker body (3) and arc extinguishing member (4), the mounting (1) includes box body (11), the front end opening of box body (11) is provided with, and the opening end of box body (11) is rotatably connected with cover (2), the inside of box body (11) is fixed with circuit breaker body (3), and circuit breaker body (3) is provided with arc extinguishing member (4), arc extinguishing member (4) includes sealed box (41), sealed box (41) is fixedly closed on circuit breaker body (3), and the inside of sealed box (41) is provided with separating piece (42), both ends of sealed box (41) are fixedly connected with guide cylinder (43) in horizontal intercommunication, and the guide cylinder (43) of sealed box (41) one end is fixedly connected with vacuum pump (44) in intercommunication, and the guide cylinder (43) of sealed box (41) other end is fixedly connected with electromagnetic valve (45) in intercommunication.

2. The circuit breaker with arc extinguishing function according to claim 1, characterized in that: The separating piece (42) includes an arc guide plate (421), which is horizontally arranged in the sealed box (41), and a plurality of arc guide pins (424) are uniformly and vertically arranged on the horizontal end face of the arc guide plate (421) close to the circuit breaker contact side.

3. The circuit breaker with arc extinguishing function according to claim 2, characterized in that: The other side of the arc guide plate (421) is vertically fixed with a plurality of arc extinguishing fins (422), and the arc extinguishing fins (422) are transversely and vertically fixed on the arc guide plate (421).

4. The circuit breaker with arc extinguishing function according to claim 3, characterized in that: A plurality of air holes are uniformly and through-provided on the arc extinguishing fins (422), and an arc extinguishing opening (423) is through-provided on the other end of the arc extinguishing fins (422).

5. The circuit breaker with arc extinguishing function according to claim 1, characterized in that: The inner walls of the sealed box (41) are vertically fixed with a plurality of grids (46) on both sides, and the grids (46) are used for vertically inserting and assembling the arc extinguishing fins (422).

6. The circuit breaker with arc extinguishing function according to claim 1, characterized in that: The other end surface of the box body (11) is horizontally and symmetrically fixed with two guide frames (12), and a screw cylinder (16) is horizontally rotatably connected to the middle of the other end surface of the box body (11), the guide frame (12) is provided with a fixed frame (13), one end of the fixed frame (13) is fixedly connected through a fixed screw (17), the other end of the fixed frame (13) is fixedly connected with a sliding block (14), and the sliding block (14) is slidingly assembled between the two guide frames (12).

7. The circuit breaker with arc extinguishing function according to claim 6, characterized in that: The end of the sliding block (14) is horizontally fixed with a threaded stud (15), and the threaded stud (15) is threadedly assembled in the screw cylinder (16).

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