Arc extinguishing chamber and disconnector

Abstract

The utility model belongs to low -voltage electrical apparatus technical field discloses a kind of arc-extinguishing chamber and disconnecting switch.The arc-extinguishing chamber includes cover shell, the arc-extinguishing assembly of setting in the opposite two sides of cover shell outer and the iron core coil assembly of setting in cover shell, cover shell has arc side, iron core coil assembly and arc side are located between two arc-extinguishing assemblies, iron core coil assembly is located arc side side, arc side other side is used to avoid the moving contact assembly of disconnecting switch, iron core coil assembly energization is used to generate magnetic field, to gather arc to arc-extinguishing assembly.When moving contact assembly and static contact separate and produce arc, arc is influenced by Lorentz force generated by iron core coil assembly energization, and then can gather arc in two arc-extinguishing assemblies, realize arc extinguishing;Existing permanent magnet is replaced by iron core coil assembly, and the temperature resistance of iron core coil assembly is better than permanent magnet, and magnetic field can be flexibly controlled by controlling current size and direction.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an arc-extinguishing chamber and a disconnecting switch. Background Technology

[0002] With the development of the photovoltaic and energy storage industries, the requirements for the breaking performance of disconnecting switches in power distribution systems are gradually increasing. Disconnecting switches typically include an operating mechanism and a contact system. As an important component in the contact system of disconnecting switches, the arc-extinguishing chamber's arc-extinguishing capability directly affects the breaking performance of the disconnecting switch.

[0003] In the existing technology, the arc-extinguishing chamber of the disconnecting switch uses a permanent magnet, which has a fixed magnetic field that cannot be flexibly controlled. Furthermore, the material of the permanent magnet itself is prone to demagnetization under high temperature conditions, resulting in a weakening of the arc-extinguishing capability.

[0004] Therefore, there is an urgent need to provide an arc-extinguishing chamber and a disconnecting switch to solve the problems of existing disconnecting switches using permanent magnets in the arc-extinguishing chamber, which result in a fixed magnetic field that cannot be flexibly controlled, and poor temperature resistance. Utility Model Content

[0005] The purpose of this invention is to provide an arc-extinguishing chamber and a disconnecting switch, which solves the problems of existing disconnecting switches using permanent magnets in the arc-extinguishing chamber, resulting in a fixed magnetic field that cannot be flexibly controlled, and poor temperature resistance.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides an arc-extinguishing chamber for installation in a disconnecting switch. The arc-extinguishing chamber includes a housing, arc-extinguishing components disposed on opposite sides outside the housing, and an iron core coil assembly disposed inside the housing. The housing has an arc-shaped side surface. The iron core coil assembly and the arc-shaped side surface are both located between the two arc-extinguishing components. The iron core coil assembly is located on one side of the arc-shaped side surface, and the other side of the arc-shaped side surface is used to avoid the moving contact assembly of the disconnecting switch. The iron core coil assembly is energized to generate a magnetic field to focus the electric arc to the arc-extinguishing component.

[0008] As an optional technical solution for an arc-extinguishing chamber, the iron core coil assembly includes a conductor and an iron core. The iron core is fixed inside the housing, and the conductor is wound around the outside of the iron core. Both ends of the conductor are used to connect to an external power source.

[0009] As an optional technical solution for the arc-extinguishing chamber, the magnetic pole direction generated by the iron core coil assembly after being energized has a non-zero vector with the axial direction extending along the entrance of the casing and between the two arc-extinguishing assemblies.

[0010] As an optional technical solution for an arc-extinguishing chamber, the iron core is formed by riveting multiple magnetic plates; and / or, the conductor is covered with an insulating sleeve.

[0011] As an optional technical solution for the arc-extinguishing chamber, it also includes a magnetic conductive sheet, which is inserted and fixed inside the housing and located on the side of the iron core coil assembly near the arc-shaped side.

[0012] As an optional technical solution for an arc-extinguishing chamber, the casing is made of a gas-generating material, and the casing is used to decompose and generate gas to accelerate arc extinguishing.

[0013] As an optional technical solution for an arc-extinguishing chamber, the housing is provided with a mounting groove, the mounting groove and the arc-shaped side are respectively located on opposite sides of the housing, and the iron core coil assembly is located in the mounting groove.

[0014] As an optional technical solution for the arc-extinguishing chamber, two of the arc-extinguishing components are symmetrically arranged on the housing.

[0015] As an optional technical solution for an arc-extinguishing chamber, the arc-extinguishing assembly includes a fixing plate and a plurality of spaced grid plates. The cover has two oppositely arranged mounting surfaces, and the iron core coil assembly is disposed between the two mounting surfaces. The fixing plate is disposed on one side of each of the two mounting surfaces that are opposite to each other. One side of the grid plate is connected to the mounting surface and the other side is connected to the corresponding fixing plate.

[0016] This utility model provides a disconnecting switch, including a housing, a stationary contact, a moving contact assembly, and the aforementioned arc-extinguishing chamber located within the housing, wherein the moving contact assembly is used to close or open with the stationary contact.

[0017] Beneficial effects:

[0018] This invention provides an arc-extinguishing chamber for installation in a disconnecting switch. The arc-extinguishing chamber includes a housing, arc-extinguishing components disposed on opposite sides outside the housing, and an iron core coil assembly disposed inside the housing. The housing has an arc-shaped side surface. The iron core coil assembly and the arc-shaped side surface are both located between the two arc-extinguishing components. The iron core coil assembly is located on one side of the arc-shaped side surface, and the other side of the arc-shaped side surface is used to avoid the moving contact assembly of the disconnecting switch. The iron core coil assembly is energized to generate a magnetic field to concentrate the electric arc to the arc-extinguishing components. When the moving contact assembly separates from the stationary contact and generates an electric arc, the moving contact assembly moves near the arc-shaped side surface. The electric arc is affected by the Lorentz force generated by the energized iron core coil assembly, which in turn concentrates the electric arc to the two arc-extinguishing components, thus extinguishing the arc. By using an iron core coil assembly in the housing instead of the existing permanent magnet, the iron core coil assembly has better temperature resistance than the permanent magnet, and the magnetic field of the iron core coil assembly can be flexibly controlled by controlling the magnitude and direction of the current.

[0019] This invention provides a disconnecting switch, which includes a housing, a stationary contact, a moving contact assembly, and an arc-extinguishing chamber located within the housing. The moving contact assembly is used to close or open with the stationary contact. The arc-extinguishing chamber uses an iron-core coil assembly instead of the existing permanent magnet, which provides flexible and controllable magnetic field and better temperature resistance. Attached Figure Description

[0020] Figure 1 This is a partial structural schematic diagram of the disconnecting switch from a first-view perspective provided in an embodiment of this utility model;

[0021] Figure 2 This is a partial structural schematic diagram of the disconnecting switch from a second perspective provided in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the arc-extinguishing chamber of the disconnecting switch provided in this embodiment of the utility model;

[0023] Figure 4 This is a cross-sectional view of the arc-extinguishing chamber of the disconnecting switch provided in this embodiment of the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the iron core coil assembly provided in this embodiment of the utility model;

[0025] Figure 6 This is a top view of the arc-extinguishing chamber of the isolating switch provided in this embodiment of the utility model.

[0026] In the picture:

[0027] 10. Arc-extinguishing chamber; 20. Stationary contact; 30. Moving contact assembly; 301. Moving contact; 40. Housing;

[0028] 1. Cover; 11. Mounting surface; 12. Arc-shaped side; 13. Mounting groove; 2. Arc extinguishing assembly; 21. Grid plate; 22. Fixing plate; 3. Iron core coil assembly; 31. Wire; 311. First end; 312. Second end; 32. Iron core; 4. Magnetic conductor. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0030] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0033] The arc-extinguishing chamber of existing disconnect switches uses magnets (permanent magnets), which mainly use magnetic blowing to lengthen the arc and increase the arc voltage. However, the magnet (permanent magnet) material is neodymium iron boron, and its operating temperature is mostly below 200℃. But during high-current switching segment tests, the instantaneous temperature in the contact system of the disconnect switch may be higher than 200℃, which is higher than the operating temperature of the neodymium iron boron material. This will cause the magnet to demagnetize, weaken the magnetic blowing effect, and affect the arc extinguishing of the product.

[0034] like Figures 1 to 6As shown, this embodiment provides an arc-extinguishing chamber 10 and a disconnecting switch. The disconnecting switch includes a housing 40, a stationary contact 20 located inside the housing 40, a moving contact assembly 30, and an arc-extinguishing chamber 10. The moving contact assembly 30 is used to close or open with the stationary contact 20. The arc-extinguishing chamber 10 includes a cover 1, arc-extinguishing assemblies 2 disposed on opposite sides outside the cover 1, and an iron core coil assembly 3 disposed inside the cover 1. The cover 1 has an arc-shaped side 12. The iron core coil assembly 3 and the arc-shaped side 12 are both located between the two arc-extinguishing assemblies 2. The iron core coil assembly 3 is located on one side of the arc-shaped side 12, and the other side of the arc-shaped side 12 is used to avoid the moving contact assembly 30 of the disconnecting switch. The iron core coil assembly 3 is energized to generate a magnetic field to concentrate the electric arc to the arc-extinguishing assembly 2.

[0035] When the moving contact assembly 30 separates from the stationary contact 20 and generates an electric arc, the moving contact assembly 30 moves near the arc-shaped side 12. The electric arc is affected by the Lorentz force generated by the energization of the iron core coil assembly 3, which in turn can concentrate the electric arc into the two arc-extinguishing assemblies 2 to extinguish the arc. By setting the iron core coil assembly 3 in the housing 1 instead of the existing permanent magnet, the iron core coil assembly 3 has better temperature resistance than the permanent magnet, and the magnetic field of the iron core coil assembly 3 can be flexibly controlled by controlling the magnitude and direction of the current.

[0036] In this embodiment, the stationary contact 20 is fixed inside the housing 40, the moving contact assembly 30 is rotatably disposed in the housing 40, the arc-extinguishing chamber 10 is disposed in the housing 40 and distributed within the rotation path range of the moving contact assembly 30, and the moving contact assembly 30 rotates along the rotation center of the housing 40 to realize the opening and closing of the disconnecting switch contact system.

[0037] Specifically, the housing 1 is provided with a mounting groove 13, and the mounting groove 13 and the arc-shaped side 12 are located on opposite sides of the housing 1, with the iron core coil assembly 3 located inside the mounting groove 13. By providing the mounting groove 13 on the housing 1 and placing the iron core coil assembly 3 inside the mounting groove 13, the housing 1 can protect the iron core coil assembly 3 and prevent it from being affected by electric arc.

[0038] In this embodiment, the Z direction is the height direction of the housing 1, the X direction is the width direction of the housing 1, the Y direction is the extension direction of the iron core coil assembly 3 along the entrance of the housing 1 and between the two arc-extinguishing assemblies 2, and the X, Y and Z directions are perpendicular to each other; the housing 1 has mounting surfaces 11 on the front and rear sides in the X direction, and the two mounting surfaces 11 are arranged opposite to each other; the housing 1 has an arc-shaped side surface 12 on one side in the Y direction, and the housing 1 has a mounting groove 13 on the other side in the Y direction. The mounting groove 13 is located between the two mounting surfaces 11, and the iron core coil assembly 3 is provided in the mounting groove 13. An arc-extinguishing assembly 2 is provided on each side of the two mounting surfaces 11 that are opposite to each other.

[0039] Optionally, the casing 1 is made of a gas-generating material. The casing 1 is used to decompose and generate gas to accelerate arc extinguishing. By using a gas-generating material to make the casing 1, the casing 1 can prevent the iron core coil assembly 3 from being burned by high temperature. Under high temperature conditions, the casing 1 decomposes and generates gas, thereby realizing the gas blowing function and assisting in enhancing arc extinguishing. Among them, the gas-generating material includes, but is not limited to, PA46 material (poly(hexamethylene adipamide)), PA66 material (poly(hexamethylene adipamide)), and POM (polyoxymethylene) material.

[0040] Optionally, two arc-extinguishing components 2 are symmetrically arranged on the housing 1. By symmetrically arranging the arc-extinguishing components 2 on both sides of the housing 1, the symmetrical layout can effectively balance the magnetic field distribution and avoid arc deflection or energy concentration due to uneven force on one side; moreover, the symmetrical structure is more stable, and can ensure that the arc of the moving contact assembly 30 can be concentrated to the arc-extinguishing component 2 at each rotation angle when the circuit is opened.

[0041] In this embodiment, the arc-extinguishing component 2 includes a fixing plate 22 and a plurality of spaced grid plates 21. The fixing plate 22 is provided on one side of each of the two mounting surfaces 11 that are opposite to each other. One side of the grid plate 21 is connected to the mounting surface 11, and the other side is connected to the corresponding fixing plate 22. The iron core coil assembly 3 is placed in the mounting groove 13 located between the two mounting surfaces 11, and the arc-extinguishing component 2 is placed on the side of each of the two mounting surfaces 11 that are opposite to each other, thereby isolating the iron core coil assembly 3 and the corresponding arc-extinguishing component 2 and preventing mutual interference between the arc-extinguishing component 2 and the iron core coil assembly 3. By setting the grid plates 21 and the fixing plate 22, the fixing plate 22 and the mounting surface 11 provide a double fixing effect for the grid plates 21, which can prevent the grid plates 21 from shifting or deforming due to arc impact. The grid plates 21 can divide the arc and also quickly dissipate arc heat, reducing the arc temperature and accelerating arc extinguishing.

[0042] In this embodiment, the movement trajectory of the moving contact 301 end of the moving contact assembly 30 is an arc shape. Correspondingly, multiple grid plates 21 are arranged at intervals along the arc, and the fixing plate 22 is an arc-shaped strip plate. The mounting surface 11 is provided with a groove, one end of the grid plate 21 is inserted into the groove of the cover 1 on the mounting surface 11, and the other end of the grid plate 21 is fixed to the fixing plate 22.

[0043] Optionally, the arc-extinguishing chamber 10 also includes a magnetic guide plate 4, which is inserted and fixed inside the housing 1. The magnetic guide plate 4 is located on the side of the iron core coil assembly 3 near the arc-shaped side 12. Installing the magnetic guide plate 4 on the housing 1 allows it to concentrate and guide the magnetic field, enabling the arc to be quickly driven into the arc-extinguishing chamber 10 upon breaking. By optimizing the magnetic circuit distribution, the magnetic guide plate 4 can significantly increase the magnetic field strength, accelerate the elongation, cooling, and breaking of the arc, thereby shortening the arc-extinguishing time and reducing contact erosion.

[0044] Furthermore, the iron core coil assembly 3 includes a conductor 31 and an iron core 32. The iron core 32 is fixed inside the housing 1, and the conductor 31 is wound around the outside of the iron core 32. Both ends of the conductor 31 are used to connect to an external power source. The structure of fixing the iron core 32 to the housing 1 ensures a stable magnetic field distribution. Combined with the wound conductor 31, it forms a closed magnetic circuit, enhancing the magnetic field strength. The conductor 31 is directly connected to the external power source, and combined with the magnetic permeability of the iron core 32, a stable magnetic field can be quickly established, reducing energy loss.

[0045] See Figure 6 Optionally, the direction of the magnetic poles generated by the iron core coil assembly 3 after being energized has a non-zero vector with the axis extending along the entrance of the casing 1 and between the two arc-extinguishing components 2. The arrangement angle of the iron core coil assembly 3 within the casing 1 can be adjusted according to actual conditions. The angle between the direction of the magnetic poles generated by the iron core coil assembly 3 after being energized and the Y direction is not 0, thus ensuring that the direction of the magnetic poles generated by the iron core coil assembly 3 after being energized has a non-zero component in the Y direction.

[0046] See Figure 5 The conductor 31 has a first end 311 and a second end 312. If current flows into the first end 311, according to the right-hand screw rule, with the right hand holding the coil and the four fingers bent in the same direction as the current, the direction pointed to by the thumb is the N pole direction of the coil. Therefore, the left side is the S pole and the right side is the N pole. If current flows into the second end 312, according to the right-hand screw rule: with the right hand holding the coil and the four fingers bent in the same direction as the current, the direction pointed to by the thumb is the N pole direction of the coil. Therefore, the left side is the N pole and the right side is the S pole. Then, according to the left-hand rule: with the left palm facing the magnetic field direction (from N pole to S pole) and the four fingers extended in the direction of the current (direction of positive charge movement), the direction of the thumb is the direction of the Lorentz force on the arc. Regardless of the current form, the arc can be blown into the corresponding grid plate 21 and cut. Then, with the assistance of the casing 1 air blowing, a magnetic blowing + cutting + air blowing configuration can be achieved. The arc is lengthened, thereby increasing the arc voltage, and subsequently extinguishing the arc to improve the product's switching performance.

[0047] Optionally, an insulating sleeve is provided around the conductor 31. In this embodiment, the conductor 31 is a copper conductor. By providing an insulating sleeve around the conductor 31, short circuits at adjacent locations are prevented when the conductor 31 is wound.

[0048] The iron core 32 is made of multiple magnetic plates riveted together; the magnetic conductive sheet 4 is also made of multiple magnetic plates riveted together.

[0049] Specifically, the magnetic plate used in the magnetic conductive sheet 4 is a magnetic steel plate (such as 10# steel, 45# steel, etc., magnetic conductive materials). The magnetic steel plate is arranged within the range where the moving contact assembly 30 rotates to the maximum angle, which can realize the magnetic conduction function and avoid the magnetic field being too weak when the moving contact assembly 30 rotates to the maximum angle of the open position. Thus, the magnetic field can also cover the maximum rotation angle, realizing strong magnetic blowing.

[0050] The iron core 32 is also formed by riveting multiple magnetic steel plates (such as silicon steel sheets). When the conductor 31 is energized, the magnetic domains of the iron core 32 are oriented under the action of the external magnetic field, which significantly reduces the magnetic resistance and makes the magnetic field lines pass through the iron core 32 more concentratedly, thereby enhancing the magnetic field strength at the center and around the coil.

[0051] The arc-extinguishing chamber 10 of the disconnecting switch provided in this embodiment has an iron core coil assembly 3 set in the housing 1. Utilizing electromagnetic theory, when current passes through the ring coil, a magnetic field is generated, replacing the traditional method of generating a magnetic field by relying on a pure magnet. Combined with the cutting of the grid plate 21 and the fact that the housing 1 is made of a gas-generating material, a magnetic blowing + cutting + air blowing method is achieved. The arc is lengthened, thereby increasing the arc voltage, and thus extinguishing the arc to improve the product's connection and disconnection performance. It also enables the product to be installed without polarity.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An arc-extinguishing chamber, characterized in that, For installation in a disconnecting switch, the arc-extinguishing chamber includes a housing (1), arc-extinguishing components (2) disposed on opposite sides outside the housing (1), and an iron core coil assembly (3) disposed inside the housing (1). The housing (1) has an arc-shaped side (12). The iron core coil assembly (3) and the arc-shaped side (12) are both located between the two arc-extinguishing components (2). The iron core coil assembly (3) is located on one side of the arc-shaped side (12). The other side of the arc-shaped side (12) is used to avoid the moving contact assembly (30) of the disconnecting switch. The iron core coil assembly (3) is energized to generate a magnetic field to concentrate the electric arc to the arc-extinguishing component (2).

2. The arc-extinguishing chamber according to claim 1, characterized in that, The iron core coil assembly (3) includes a wire (31) and an iron core (32). The iron core (32) is fixed inside the housing (1). The wire (31) is wound around the iron core (32). Both ends of the wire (31) are used to connect to an external power source.

3. The arc-extinguishing chamber according to claim 2, characterized in that, The magnetic pole direction generated by the iron core coil assembly (3) after being energized has a non-zero vector with the axial direction extending along the entrance of the cover (1) and between the two arc extinguishing assemblies (2).

4. The arc-extinguishing chamber according to claim 2, characterized in that, The iron core (32) is formed by riveting multiple magnetic plates; and / or, the conductor (31) is covered with an insulating sleeve.

5. The arc-extinguishing chamber according to claim 1, characterized in that, It also includes a magnetic conductive sheet (4), which is inserted and fixed inside the housing (1). The magnetic conductive sheet (4) is located on the side of the iron core coil assembly (3) near the arc-shaped side surface (12).

6. The arc-extinguishing chamber according to claim 1, characterized in that, The material of the cover (1) is a gas-generating material, and the cover (1) is used to decompose and generate gas to accelerate arc extinguishing.

7. The arc-extinguishing chamber according to any one of claims 1-6, characterized in that, The cover (1) is provided with a mounting groove (13), the mounting groove (13) and the arc-shaped side (12) are located on opposite sides of the cover (1), and the iron core coil assembly (3) is located in the mounting groove (13).

8. The arc-extinguishing chamber according to any one of claims 1-6, characterized in that, The two arc-extinguishing components (2) are symmetrically arranged on the housing (1).

9. The arc-extinguishing chamber according to any one of claims 1-6, characterized in that, The arc extinguishing assembly (2) includes a fixing plate (22) and a plurality of spaced grid plates (21). The cover (1) has two oppositely arranged mounting surfaces (11). The iron core coil assembly (3) is provided between the two mounting surfaces (11). The fixing plate (22) is provided on the side of the two mounting surfaces (11) that are opposite to each other. One side of the grid plate (21) is connected to the mounting surface (11) and the other side is connected to the corresponding fixing plate (22).

10. A disconnecting switch, characterized in that, It includes a housing (40), a stationary contact (20) located within the housing (40), a moving contact assembly (30), and an arc-extinguishing chamber as claimed in any one of claims 1-9, wherein the moving contact assembly (30) is used to close or open with the stationary contact (20).

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