Magnetic quenching chamber

Abstract

The utility model relates to the field of arc extinguish chambers, in particular to a magnetic quenching arc extinguish chamber. Comprising a housing, an opening is arranged below the housing, and an arc extinguishing cover is arranged above the housing; the plurality of grid sheets are arranged in the shell; the two strong magnets are arranged on the two sides of the inner wall of the opening of the shell respectively; the two magnet cover plates are mounted on the shell, and mounting cavities for mounting the strong magnets are formed between the magnet cover plates and the shell; according to the utility model, the strong magnet is fixedly arranged in the magnet cover plate, the installation structure is stable, the strong magnet and the gas production material are combined for use, the strong magnet attracts an electric arc, and the electric arc reacts with the gas production material, so that faster arc extinguishing is realized.

Description

Technical Field

[0001] The utility model relates to the field of arc extinguishing chambers, in particular to a magnetic blowout arc extinguishing chamber. Background Art

[0002] The common method of arc extinguishing for circuit breakers is grid arc extinguishing. When the contacts of the circuit breaker are separated, the generated arc is pushed into a set of metal grids under the action of electric force and is divided into several sections. Each metal grid that is insulated from each other is equivalent to an electrode, so there are many positive and negative voltage drops. For AC arcs, near the cathode, when the arc passes through zero, a dielectric strength of 150V to 250V will appear, making the arc unable to continue to be maintained and extinguished. Since the grid extinguishing effect is much stronger than that of DC, AC appliances often use grid arc extinguishing.

[0003] However, the above method still cannot achieve a better arc extinguishing effect.

[0004] Therefore, there is an urgent need to provide an improved technical solution to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a magnetic blowout arc extinguishing chamber which can extinguish arcs more quickly in view of the above-mentioned existing technical problems.

[0006] In view of this, the utility model provides a magnetic blow-out arc chamber, characterized in that it includes:

[0007] A casing, wherein an opening is provided at the bottom of the casing and an arc extinguishing cover is provided at the top;

[0008] A plurality of grid sheets, wherein the plurality of grid sheets are arranged in the housing;

[0009] Two strong magnets, the two strong magnets are respectively arranged on both sides of the inner wall of the shell opening;

[0010] Two magnet cover plates are installed on the shell, and an installation cavity for installing strong magnets is provided between the magnet cover plates and the shell.

[0011] Furthermore, a plurality of protruding rods are arranged on the end surface of the magnet cover plate in contact with the shell, and a through hole for installing the protruding rods is arranged on the shell.

[0012] Furthermore, the housing includes a left housing and a right housing, and the left and right housings are provided with a plurality of mounting grooves for mounting a plurality of grid plates.

[0013] Furthermore, the upper end surface of the magnet cover is provided with a plurality of exposure holes, and the exposure holes are connected with the outside and the installation cavity.

[0014] Furthermore, the upper portion of the rib plate between the placement grooves is wider and the lower portion is narrower.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model fixes a strong magnet in the magnet cover plate, the installation structure is stable, and the strong magnet is used in combination with a gas-generating material. The strong magnet attracts the arc, and the arc reacts with the gas-generating material to achieve faster arc extinguishing.

[0017] 2. The utility model provides a plurality of square exposure holes on the upper end surface of the magnet cover plate, and the exposure holes can expose the strong magnet to the outside world, thereby making the magnetism of the strong magnet stronger and making the effect of magnetic arc blowing stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of two arc-extinguishing chambers of the utility model, each having half of the shell;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of an arc extinguishing chamber of the utility model, two half shells each and one complete shell;

[0020] Figure 3 Detailed structural diagram of the utility model

[0021] Figure 4 for Figure 3 Schematic diagram of the structure of the middle A area;

[0022] Figure 5 for Figure 3 Schematic diagram of the structure of area B in the middle.

[0023] The symbols in the figure are:

[0024] 1. Outer shell; 2. Arc extinguishing cover; 3. Grid; 4. Strong magnet; 5. Magnet cover plate; 6. Mounting cavity; 7. Protruding rod; 8. Mounting groove; 9. Rib plate; 10. Exposure hole. Specific embodiments

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0026] Embodiment 1:

[0027] This embodiment provides a magnetic blowout arc extinguishing chamber, characterized by comprising:

[0028] A housing 1, wherein an opening is provided at the bottom of the housing 1 and an arc extinguishing cover 2 is provided at the top;

[0029] A plurality of grid sheets 3, wherein the plurality of grid sheets 3 are arranged in the housing 1;

[0030] Two strong magnets 4, the two strong magnets 4 are respectively arranged on both sides of the inner wall of the opening of the shell 1;

[0031] Two magnet cover plates 5 are installed on the housing 1 , and a mounting cavity 6 for mounting the strong magnet 4 is provided between the magnet cover plates 5 and the housing 1 .

[0032] The shell 1 is a square box made of arc-extinguishing gas-producing material, with a cavity inside, and an opening is provided at the bottom of the shell 1, and an arc-extinguishing cover 2 is provided above the shell 1. The arc-extinguishing gas-producing material is usually a special material that can produce gas during the arc extinguishing process. The arc-extinguishing gas-producing material is usually composed of one or more chemical substances, which can produce a large amount of gas during the arc extinguishing process to extinguish the arc. These materials can react quickly, produce a large amount of gas, and quickly consume the energy of the arc, so that it loses the conditions for maintaining the arc, thereby achieving the purpose of arc extinguishing; Common arc-extinguishing gas-producing materials The material includes paraffin, and the shell 1 can also be made of plastic material with arc-extinguishing gas-generating material attached to the surface; a plurality of grids 3 arranged in parallel are installed in the shell 1, and the grids 3 are made of metal. When the contacts of the circuit breaker are separated, the generated arc is pushed into a group of metal grids 3 under the action of electric force and is divided into several sections. Each of the metal grids 3 insulated from each other is equivalent to an electrode, so there are many positive and negative voltage drops; for an AC arc, near the cathode, when the arc passes through zero, a dielectric strength of 150V to 250V will appear, making it impossible for the arc to continue to be maintained and extinguished.

[0033] A V-shaped notch is provided on the lower side of the grid 3, and the design of the V-shaped grid 3 helps to improve the arc extinguishing performance. In high-voltage switchgear, an arc is generated when the current is disconnected. By using the V-shaped grid 3, the arc can be extinguished more effectively, the energy of the arc can be reduced, and the reliability of the equipment can be increased. The V-shaped grid 3 can better control the electric field distribution, which helps to guide the arc so that it is concentrated on the V-shaped grid 3. This helps to reduce the impact of the arc on the surrounding of the equipment and improve the tolerance of the equipment. The design of the V-shaped grid 3 helps to improve thermal stability. During the arc extinguishing process, the high temperature generated by the arc needs to be effectively handled. The shape of the V-shaped grid 3 can help disperse the heat and reduce the thermal shock to the equipment. The design of the V-shaped grid 3 can reduce the possibility of arc strikeback. Arc strikeback refers to the phenomenon that the arc rebounds back to the equipment during the arc extinguishing process. The design of the V-shaped grid 3 can reduce the possibility of such rebound. The V-shaped grid 3 can shorten the distance the arc moves. This is crucial to increase the arc extinguishing speed and reduce the arc duration, thereby protecting the equipment from damage by the arc.

[0034] Two strong magnets 4, the two strong magnets 4 are respectively arranged on both sides of the inner wall of the opening of the shell 1;

[0035] Two magnet cover plates 5 are installed on the housing 1 , and a mounting cavity 6 for mounting the strong magnet 4 is provided between the magnet cover plates 5 and the housing 1 .

[0036] The magnet cover plate 5 is also made of a gas generating material or the surface is covered with a gas generating material.

[0037] The magnet cover plate 5 is fitted on the inner wall of the lower end of the housing 1, and a mounting cavity 6 for accommodating the strong magnet 4 is provided on the end surface where the magnet cover plate 5 and the inner wall of the housing 1 are fitted. The strong magnet 4 is first installed in the mounting cavity 6, and then the magnet cover plate 5 is installed on the inner wall of the lower end of the housing 1 by gluing. The magnet uses a strong magnet 4 with strong magnetism to meet the magnetic force requirements of magnetic blowout. Magnetic blowout is an arc extinguishing technology for disconnecting high current circuits. It is a method of blowing out the arc through the magnetic field force generated by the current at the moment of current interruption. To ensure that the arc is quickly extinguished when the circuit is disconnected to prevent the arc from causing damage to the equipment and system.

[0038] The principle of magnetic blowout is based on the Lorentz force, that is, when current passes through a conductor, it generates a magnetic field around it. When the current is cut off, the magnetic field generated causes a magnetic force, which can be used to separate the arc from the electrode and blow it out. The magnetic field generates a Lorentz force, which acts on the arc and blows it out quickly. This prevents the arc from continuing to exist when the circuit is disconnected, thereby reducing the damage to the equipment caused by the arc and increasing the life of the equipment; magnetic blowout can quickly extinguish the arc, has high reliability and good protection effect on the equipment.

[0039] The strong magnet 4 is fixedly installed in the magnet cover plate 5, the installation structure is stable, and the strong magnet 4 is used in combination with the gas-generating material. The strong magnet 4 attracts the arc, and the arc reacts with the gas-generating material to achieve faster arc extinguishing.

[0040] Embodiment 2:

[0041] This embodiment provides a magnetic blow-out arc chamber, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0042] A plurality of protruding rods 7 are provided on the end surface of the magnet cover plate 5 that contacts the housing 1 , and through holes for mounting the protruding rods 7 are provided on the housing 1 .

[0043] Two cylindrical protruding rods 7 are provided on the end face of the magnet cover plate 5 in contact with the outer shell 1, and multiple protruding rods 7 can also be provided. A through hole for installing the protruding rods 7 is provided on the outer shell 1, so that the installation of the magnet cover plate 5 in contact with the outer shell 1 is set to be detachable; and bonding can also be performed on this basis to achieve a faster positioning and installation technical effect.

[0044] The housing 1 comprises a left housing 1 and a right housing 1 , and the left and right housings 1 are provided with a plurality of mounting grooves 8 for mounting a plurality of grid plates 3 .

[0045] The shell 1 includes two parts, and the wall panels on both sides of the shell 1 are separated. The separation can be made at one-half or at other positions, and the wall panels on both sides can be separated and connected by fasteners, such as screws and nuts; a placement groove 8 for installing the grid 3 is provided in the left and right shells 1, so that the grid 3 is embedded in the shell 1, and after the grid 3 is installed on the shell 1 on one side, the shell 1 on the other side is buckled to achieve fixed installation of the grid 3 and the shell 1. The grid 3 is set to a detachable structure to replace the grid 3. When the grid 3 or the shell 1 is damaged, it can be partially replaced to reduce costs.

[0046] Embodiment 3:

[0047] This embodiment provides a magnetic blow-out arc chamber, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0048] The upper end surface of the magnet cover plate 5 is provided with a plurality of exposure holes 10 , and the exposure holes 10 are in communication with the outside and the installation cavity 6 .

[0049] A plurality of square exposure holes 10 are provided on the upper end surface of the magnet cover plate 5. The exposure holes 10 can expose the strong magnet 4 to the outside without blocking the magnetic flux lines generated by the strong magnet 4, thereby making the magnetism of the strong magnet stronger and making the effect of magnetic arc blowing stronger.

[0050] The ribs 9 between the grooves 8 are arranged such that the upper portion thereof is wider and the lower portion thereof is narrower.

[0051] When installing the grid plate 3 , the housing 1 is turned upside down, and the grid plate 3 is preferentially clamped at the position of the wide rib plate 9 and the grid plate 3 can be adjusted through the opening of the housing 1 . The wide rib plate 9 is more convenient for installing the grid plate 3 .

[0052] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which belong to the protection scope of the present application.

Claims

1. A magnetic blow-out arc chamber, It is characterized in that include: A housing (1), wherein an opening is provided at the bottom of the housing (1) and an arc extinguishing cover (2) is provided at the top; A plurality of grid plates (3), wherein the plurality of grid plates (3) are arranged in the housing (1); Two strong magnets (4), the two strong magnets (4) are respectively arranged on both sides of the inner wall of the opening of the shell (1); Two magnet cover plates (5) are mounted on the housing (1), and a mounting cavity (6) for mounting a strong magnet (4) is provided between the magnet cover plates (5) and the housing (1).

2. A magnetic blow-out chamber according to claim 1, It is characterized in that A plurality of protruding rods (7) are provided on the end surface of the magnet cover plate (5) in contact with the outer shell (1), and a through hole for installing the protruding rods (7) is provided on the outer shell (1).

3. A magnetic blow-out arc chamber according to claim 1, It is characterized in that The housing (1) comprises a left housing (1) and a right housing (1), and the left and right housings (1) are provided with a plurality of mounting grooves (8) for mounting a plurality of grid plates (3).

4. A magnetic blow-out arc chamber according to claim 1, It is characterized in that The upper end surface of the magnet cover plate (5) is provided with a plurality of exposure holes (10), and the exposure holes (10) are in communication with the outside and the installation cavity (6).

5. A magnetic blow-out chamber according to claim 1, It is characterized in that The upper part of the rib plate (9) between the placement grooves (8) is wider, and the lower part is narrower.

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