A limited arc path module for a rotary disconnector

Abstract

A limited arc path module for a rotary disconnector, characterized in that it comprises an arc limiting block (10), the upper surface of the arc limiting block (10) is provided with an arc striking groove (1001), and the arc striking groove (1001) is located at the two side ends of the arc limiting block (10) and is connected to the outside. The present invention adds an arc limiting path module to the disconnector, so that the arc generated when the moving and static contacts are disconnected moves along a planned path to finally achieve the purpose of extinguishing the arc, and the entire module avoids increasing the volume of existing insulating parts and increasing the thickness of existing insulating parts. At the same time, the arc limiting path module is separately provided, which can reduce the weight and volume of parts. The arc can only burn in the high-temperature resistant and insulating route planned by the limiting path module, which is safer and more reliable. The arc limiting block is made of high-temperature resistant and highly insulating materials, and can disconnect higher power currents under the same volume, thereby extending the service life.

Description

Technical Field

[0001] The invention belongs to the technical field of switches, and in particular relates to an arc path limiting module for a rotary isolating switch. Background Art

[0002] The word switch means opening and closing. It refers to a component that can open a circuit, interrupt the current or make it flow to other circuits. The most common switch is a human-operated electromechanical device with one or more contacts. The "closed" of the contact means that the contact is conducting and allows current to flow; the "open" of the switch means that the contact is not conducting and forms an open circuit, and does not allow current to flow. The development history of switches has evolved from the original knife switch that requires manual operation to the intelligent switch currently used in various large-scale electrical control equipment. The functions of switches are increasing and the safety is also increasing. The rotary switch is a common switch that prevents the rotary operating device from being operated without authorization by locking the rotary operator in a specific position corresponding to the specific state of the rotary operating device. Rotary isolating switches are widely used in power systems, such as photovoltaics, wind power, etc. For example, in a photovoltaic system, the small current generated in each photovoltaic cell is combined in parallel to provide the required current or total power to the utilization system.

[0003] Usually, an arc will be generated when the moving and static contacts of a rotary disconnector are separated. There is a space between the moving and static contacts from the closed position to the separated position. This space is composed of insulating parts. The arc moves irregularly in this space. The arc will burn through the surface of the material. When these materials are burned, the insulation performance will decrease. After many times, the insulation effect will fail, which will lead to insulation failure or reduced life. When the disconnected power increases, the distance between the moving and static contacts is generally increased, or the material around the contacts is strengthened to achieve safe disconnection. However, this approach is bound to increase the size of the electrical switch and add more materials to meet the conditions for arc extinguishing. Summary of the invention

[0004] The purpose of the present invention is to provide a limited arc path module for a rotary disconnector in order to address the technical defect that the arc path generated by the above-mentioned existing rotary disconnector when the moving and static contacts are disconnected is unlimited and easily burns the insulating parts of the disconnector, resulting in reduced insulation performance. By adding the limited arc path module in the disconnector, the arc generated when the moving and static contacts are disconnected is moved along a planned path to ultimately achieve the purpose of extinguishing the arc. The entire module avoids increasing the volume of existing insulating parts and increasing the thickness of existing insulating parts.

[0005] Technical Solution

[0006] In order to achieve the above technical objectives, the present invention designs an arc limiting path module for a rotary disconnector, which is characterized in that it includes an arc limiting block, and an arc striking groove is provided on the upper surface of the arc limiting block, and the arc striking groove is located at the two side ends of the arc limiting block and is connected to the outside.

[0007] Furthermore, the arc limiting block is installed on the moving track of the moving contact piece of the moving contact assembly of the disconnector and is located below the moving contact piece in the inner cavity of the contact housing.

[0008] Preferably, the arc limiting block is made of high temperature resistant insulating material.

[0009] Furthermore, a positioning block is provided on the arc limiting block, and the positioning block is installed in a positioning groove of the contact housing. There are at least two arc limiting blocks.

[0010] Preferably, the arc limiting block is circular or fan-shaped.

[0011] Preferably, the arc striking groove is in a continuous wave shape or a continuous "" shape.

[0012] Furthermore, the movable contact assembly of the isolating switch includes an upper shell and a lower shell, and the upper shell and the lower shell are assembled together. After the upper shell and the lower shell are assembled together, an open space is formed between the lower surface of the upper shell and the upper surface of the lower shell, and the movable contact piece is installed in the open space. The elastic element is placed in the open space with one end against the movable contact piece and the other end against the upper shell so that the movable contact piece can move up and down in the open space.

[0013] Preferably, the upper shell and the lower shell are made of insulating material, and the moving contact piece is made of conductive material.

[0014] Preferably, the movable contact piece can only move up and down in the open space.

[0015] Preferably, the elastic element is a compression spring or a tension spring or a spring sheet, and one end of the elastic element that abuts against the upper shell is located in a mounting groove of the upper shell.

[0016] Preferably, the upper shell and the lower shell are connected by snap-fit ​​connection, welding or gluing.

[0017] Preferably, the shape of the moving contact piece corresponds to the open space, and the moving contact piece is located on the central axis after the upper shell and the lower shell are assembled together.

[0018] Furthermore, a connection block extends out from the upper surface of the upper shell, and a connection groove corresponding to the connection block is provided on the lower surface of the lower shell.

[0019] Furthermore, an arc-striking piece is installed on the outside of the movement trajectory of the moving contact piece of the moving contact assembly of the isolating switch, the lower shell of the moving contact assembly is installed in the contact mounting groove of the contact shell, the lower shell can rotate in the contact mounting groove to drive the moving contact assembly to rotate, during the rotation of the moving contact assembly, the moving contact piece can be connected or disconnected with the static contact piece of the static contact, the static contact is installed in the static contact mounting groove of the contact shell, the arc-striking piece is installed in the arc-striking groove of the contact shell, and the arc-striking head of the arc-striking piece is placed on one side of the static contact, which can introduce the arc when the moving contact piece and the static contact piece are disconnected into the exhaust port of the contact shell for discharge.

[0020] Preferably, the arc-starting pieces are made of conductive metal, and there are at least two arc-starting pieces.

[0021] Furthermore, the arc-striking piece includes an arc-striking head and a mounting end, and the arc-striking head is hook-shaped.

[0022] The present invention also provides a rotary disconnector, characterized in that it comprises the arc path limiting module of the rotary disconnector.

[0023] Beneficial Effects

[0024] The present invention provides a limiting arc path module for a rotary isolating switch. By adding the limiting arc path module in the isolating switch, the arc generated when the moving and static contacts are disconnected is moved along a planned path to finally achieve the purpose of extinguishing the arc. The entire module avoids increasing the volume of existing insulating parts and increasing the thickness of existing insulating parts. At the same time, the limiting arc path module is set separately, which can reduce the weight and volume of parts. The arc can only burn in the high-temperature resistant and insulating route planned by the limiting path module, which is safer and more reliable. The limiting arc block is made of high-temperature resistant and highly insulating materials. It can disconnect higher power currents under the same volume, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 It is a product diagram of the arc limiting block in an embodiment of the present invention.

[0026] Attached Figure 2 It is a front view of the arc limiting block in an embodiment of the present invention.

[0027] Attached Figure 3 It is a product picture of the moving contact assembly in an embodiment of the present invention.

[0028] Attached Figure 4 Schematic diagram of the structure of the moving contact assembly in an embodiment of the present invention.

[0029] Attached Figure 5 It is a bottom view of the moving contact assembly in the embodiment of the present invention.

[0030] Attached Figure 6It is a product picture of the arc-starting sheet in an embodiment of the present invention.

[0031] Attached Figure 7 2 is a product diagram of a contact housing in an embodiment of the present invention.

[0032] Attached Figure 8 It is a schematic diagram of the positions of the arc striking piece and the arc limiting block in an embodiment of the present invention.

[0033] Attached Fig. 9 It is an exploded view of the rotary isolating switch in the embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Example

[0036] As attached Figure 1 and 2 As shown, a limiting arc path module of a rotary disconnector includes an arc limiting block 10 made of a high temperature resistant insulating material, the upper surface of the arc limiting block 10 is provided with a continuous wavy or continuous ""-shaped arc striking groove 1001, and the arc striking groove 1001 is located at the two side ends of the arc limiting block 10 and is connected to the outside. Specifically, a positioning block 1002 is provided on the arc limiting block 10, and the positioning block 1002 is installed in the positioning groove 705 of the contact housing 7, and the arc limiting block 10 is composed of two pieces. Preferably, the arc limiting block 10 is circular or fan-shaped, or, in this embodiment, the arc limiting block 10 is fan-shaped.

[0037] As attached Figure 8 As shown, the arc limiting block 10 is installed on the moving track of the moving contact piece 5 of the disconnector moving contact assembly and is located below the moving contact piece 5 in the inner cavity of the contact housing 7. Figure 3 , 4As shown in Figures 1 and 5, the movable contact assembly of the isolating switch includes an upper shell 1 and a lower shell 2 made of insulating material. The upper shell 1 and the lower shell 2 are assembled together by snap connection, welding or glue bonding. After the upper shell 1 and the lower shell 2 are assembled together, an open space 4 is formed between the lower surface of the upper shell 1 and the upper surface of the lower shell 2. The movable contact piece 5 is installed in the open space 4. The elastic element 6 is placed in the open space 4 with one end against the movable contact piece 5 and the other end against the mounting groove 101 of the upper shell 1 so that the movable contact piece 5 can move up and down in the open space 4. The movable contact piece 5 is made of conductive material. In this embodiment, the movable contact piece 5 can only move up and down in the open space 4, and cannot generate flipping and movement in other directions. The shape of the movable contact piece 5 corresponds to the open space 4 to limit the movement of the movable contact piece 5 in the horizontal direction. The movable contact piece 5 is located on the central axis after the upper shell 1 and the lower shell 2 are assembled together.

[0038] The elastic element 6 is a compression spring or a tension spring or a spring. In this embodiment, the elastic element 6 is a compression spring. A connecting block 102 extends from the upper surface of the upper shell 1, and a connecting groove 201 corresponding to the connecting block 102 is provided on the lower surface of the lower shell 2. The connecting block 102 is placed in the connecting groove 201 so that several moving contact assemblies can be superimposed and connected. When multiple moving contact assemblies are superimposed together, they have a common axis and can rotate synchronously. The moving contact assembly is as shown in the attached Figure 7 When the contact housing 7 of the rotary isolating switch shown rotates, when it rotates to the on position, the moving contact piece 5 is connected with the stationary contact piece 801, and an insulating space is formed between the moving contact assembly and the contact housing 7, ensuring the insulation of the moving contact, the stationary contact and other parts at this time. At the same time, the elastic element 6 provides downward pressure when the contacts are in contact, ensuring the reliability of the contact.

[0039] In addition, in this embodiment, two arc-striking pieces 9 made of conductive metal are installed outside the moving track of the moving contact piece 5 of the moving contact assembly of the disconnector. The lower shell 2 of the moving contact assembly is installed in the contact mounting groove 701 of the contact housing 7. The lower shell 2 can rotate in the contact mounting groove 701 to drive the moving contact assembly to rotate. During the rotation of the moving contact assembly, the moving contact piece 5 can be connected or disconnected with the static contact piece 801 of the static contact 8. The connecting part of the static contact 8 is fixedly installed in the static contact mounting groove 702 of the contact housing 7 by screws. The arc-striking piece 9 is installed in the arc-striking groove 703 of the contact housing 7. Figure 6 As shown, the arc-striking piece 9 includes an arc-striking head 901 and a mounting end 902, and the arc-striking head 901 is hook-shaped. The arc-striking head 901 of the arc-striking piece 9 is placed on one side of the stationary contact 8 to guide the arc when the moving contact piece 5 and the stationary contact piece 801 are disconnected to the exhaust port 704 of the contact housing 7 for discharge.

[0040] In this embodiment, when the moving contact piece 5 moves from the process of connection to disconnection, the moving contact assembly, the contact housing 7, and the arc limiting block 10 form an insulating space, and the moving contact piece 5 leaves the static contact piece 801 for a certain distance and reaches the exhaust port 704 of the contact housing 7. At this time, the moving contact piece 5 can release the free electron cloud therein, and remove part of the free electron cloud to the outside of the contact housing 7 through the exhaust port 704 of the contact housing 7 and the arc striking piece 9. When the moving contact piece 5 leaves the exhaust port 704 of the contact housing 7, the moving contact assembly, the contact housing 7, and the arc limiting block 107 form an insulating space, and the arc can only be generated along the small arc striking groove 1001. The arc is quickly extinguished under the action of the free electron cloud released in front and the voltage drop of the arc striking groove 1001, completing the function of disconnecting the arc.

[0041] This embodiment also provides a rotary isolating switch, which includes the moving contact assembly of the rotary isolating switch or the arc striking module of the rotary isolating switch or the arc path limiting module of the rotary isolating switch. Fig. 9 As shown, a rotary isolating switch drives the moving contact assembly to rotate by an operating mechanism 3 to achieve the purpose of connecting and disconnecting the circuit.

[0042] The present invention provides a limiting arc path module for a rotary isolating switch. By adding the limiting arc path module in the isolating switch, the arc generated when the moving and static contacts are disconnected is moved along a planned path to finally achieve the purpose of extinguishing the arc. The entire module avoids increasing the volume of existing insulating parts and increasing the thickness of existing insulating parts. At the same time, the limiting arc path module is set separately, which can reduce the weight and volume of parts. The arc can only burn in the high-temperature resistant and insulating route planned by the limiting path module, which is safer and more reliable. The limiting arc block is made of high-temperature resistant and highly insulating materials. It can disconnect higher power currents under the same volume, thereby extending the service life.

[0043] The structures, proportions, sizes, quantities, etc. illustrated in the drawings of the present embodiment are only used to match the contents disclosed in the specification so as to be understood and read by those familiar with the technology, and are not used to limit the limiting conditions for implementation of the present embodiment, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship, or adjustment of the size should still fall within the scope of the technical contents disclosed in the present embodiment without affecting the effects and purposes that can be achieved by the present embodiment. At the same time, the terms such as "upper", "lower", "left", "right", "middle", "clockwise", "counterclockwise", etc. cited in the present specification are only for the convenience of description, and are not used to limit the scope of implementation of the present embodiment. The change or adjustment of the relative relationship should also be regarded as the scope of implementation of the present embodiment without substantial change of the technical contents.

Claims

1. An arc path limiting module for a rotary disconnector, characterized in that: It comprises an arc limiting block (10), wherein an arc striking groove (1001) is provided on the upper surface of the arc limiting block (10), and the arc striking groove (1001) is located at both side ends of the arc limiting block (10) and is connected to the outside; The arc limiting block (10) is installed on the moving track of the moving contact piece (5) of the moving contact assembly of the disconnector and is located below the moving contact piece (5) in the inner cavity of the contact housing (7) to make the arc move along the arc striking groove (1001); The arc limiting block (10) is made of high temperature resistant insulating material; An arc-striking piece (9) is installed outside the moving track of the moving contact piece (5) of the moving contact assembly of the isolating switch. The lower shell (2) of the moving contact assembly is installed in the contact mounting groove (701) of the contact shell (7). The lower shell (2) can rotate in the contact mounting groove (701) to drive the moving contact assembly to rotate. During the rotation of the moving contact assembly, the moving contact piece (5) can be connected or disconnected with the stationary contact piece (801) of the stationary contact (8). The stationary contact (8) is installed in the stationary contact mounting groove (702) of the contact shell (7). The arc-striking piece (9) is installed in the arc-striking groove (703) of the contact shell (7). The arc-striking head (901) of the arc-striking piece (9) is arranged on one side of the stationary contact (8) and can introduce the arc when the moving contact piece (5) and the stationary contact piece (801) are disconnected into the exhaust port (704) of the contact shell (7) for discharge.

2. The arc path limiting module of a rotary disconnector according to claim 1, characterized in that: The arc limiting block (10) is provided with a positioning block (1002), and the positioning block (1002) is installed in a positioning groove (705) of the contact housing (7). There are at least two arc limiting blocks (10).

3. The arc path limiting module of a rotary disconnector according to claim 1, characterized in that: The arc limiting block (10) is circular or fan-shaped.

4. The arc path limiting module of a rotary disconnector according to claim 1, characterized in that: The arc striking groove (1001) is in a continuous wave shape or a continuous "" shape.

5. The arc path limiting module of a rotary disconnector according to claim 1, characterized in that: The isolating switch movable contact assembly comprises an upper shell (1) and a lower shell (2). The upper shell (1) and the lower shell (2) are assembled together. After the upper shell (1) and the lower shell (2) are assembled together, an open space (4) is formed between the lower surface of the upper shell (1) and the upper surface of the lower shell (2). The movable contact piece (5) is arranged in the open space (4). An elastic element (6) is placed in the open space (4) with one end abutting against the movable contact piece (5) and the other end abutting against the upper shell (1) so that the movable contact piece (5) can move up and down in the open space (4).

6. The arc path limiting module of a rotary disconnector according to claim 5, characterized in that: The upper shell (1) and the lower shell (2) are made of insulating materials, and the moving contact piece (5) is made of conductive material.

7. The arc path limiting module of a rotary disconnector according to claim 5, characterized in that: The movable contact piece (5) can only move up and down in the open space (4).

8. The arc path limiting module of a rotary disconnector according to claim 5, characterized in that: The elastic element (6) is a compression spring or a tension spring or a spring sheet, and one end of the elastic element (6) that abuts against the upper shell (1) is located in the mounting groove (101) of the upper shell (1).

9. The arc path limiting module of a rotary disconnector according to claim 5, characterized in that: The upper shell (1) and the lower shell (2) are connected by snap fastening, welding or gluing.

10. The arc path limiting module of a rotary disconnector according to claim 5, characterized in that: The shape of the movable contact piece (5) corresponds to the open space (4), and the movable contact piece (5) is located on the central axis after the upper shell (1) and the lower shell (2) are assembled together.

11. The arc path limiting module of a rotary disconnector according to claim 5, characterized in that: A connecting block (102) extends out from the upper surface of the upper shell (1), and a connecting groove (201) corresponding to the connecting block (102) is provided on the lower surface of the lower shell (2).

12. The arc path limiting module of a rotary disconnector according to claim 1, characterized in that: The arc-starting pieces (9) are made of conductive metal, and there are at least two arc-starting pieces (9).

13. The arc path limiting module of a rotary disconnector according to claim 1, characterized in that: The arc-striking piece (9) comprises an arc-striking head (901) and a mounting end (902), and the arc-striking head (901) is hook-shaped.

14. A rotary isolating switch, characterized in that: It comprises the arc path limiting module of the rotary disconnector as claimed in any one of claims 1 to 13.

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