A moving contact assembly of a rotary disconnector

Abstract

A movable contact assembly of a rotary isolating switch, which comprises an upper shell (1) and a lower shell (2), the upper shell (1) and the lower shell (2) are assembled together, and an open space (4) is formed between the lower surface of the upper shell (1) and the upper surface of the lower shell (2) after the upper shell (1) and the lower shell (2) are assembled together, a movable contact (5) is arranged in the open space (4), and an elastic element (6) is arranged in the open space (4) and abuts against the movable contact (5) at one end and abuts against the upper shell (1) at the other end, so that the movable contact (5) can move up and down in the open space (4). The movable contact assembly changes the fixed installation of the movable contact of the movable contact assembly into elastic installation, avoids plastic deformation of the movable contact of the movable contact assembly caused by multiple on-off operations, effectively reduces the friction caused by the contact between the movable contact and the static contact, prolongs the service life of the movable contact, improves the breaking speed of the movable contact and the static contact, the volume of the whole mechanism basically remains unchanged, and the production cost is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of switches, and in particular relates to a moving contact assembly of a rotary isolating switch. Background Art

[0002] The word "switch" means "on" and "off." It refers to a component that can open a circuit, interrupt current flow, or redirect it to another circuit. The most common switch is a human-operated electromechanical device with one or more contacts. A "closed" contact indicates that the contact is conducting, allowing current to flow; an "open" contact indicates that the contact is not conducting, thus opening the circuit and preventing current from flowing. Switches have evolved from the original manual knife switch to the intelligent switches currently used in various large electrical control devices. These switches have become increasingly versatile and secure. A common type of switch is the rotary switch, which prevents unauthorized operation of the rotary actuator by locking it in a specific position corresponding to a specific state of the rotary actuator. Rotary disconnectors are widely used in power systems, such as photovoltaic and wind power. For example, in a photovoltaic system, the small currents generated by each photovoltaic cell are combined in parallel to provide the required current or total power to the system.

[0003] Currently, common rotary disconnect switches include an operating mechanism and several contact modules, each housing a moving contact assembly. Traditional moving contact assemblies consist of two riveted moving contact pieces made of conductive metal. When connected, the static contact is positioned between the moving contact pieces of the moving contact. The moving contact piece bends and clamps the static contact point of the static contact. When disconnected, the moving contact piece overcomes resistance and leaves the static contact. Repeated closing and disconnecting of the moving and static contacts causes the moving contact piece to bend multiple times, causing the conductive metal moving contact piece to plastically deform, resulting in a change in the spacing between the two moving contact pieces. This can easily lead to poor contact during connection and severe contact burnout. Furthermore, the two-piece moving contacts need to overcome friction when in contact, which reduces the speed of connection and disconnection, hindering the rapid disconnection and connection of the moving and static contacts. In order to solve the above technical difficulties, the conventional method is to set a metal part at the end of the disconnect position of the mechanism to attract the plasma arc to extinguish the arc; or to solve the technical defects of plastic deformation and high friction by strengthening the strength of the parts and thickening the material. However, this conventional solution will increase the size of the switch and increase the cost of the product. Summary of the Invention

[0004] The purpose of the present invention is to address the technical defects that the moving contact assembly in the existing rotary isolating switch contact module is prone to plastic deformation, resulting in poor contact and contact erosion when connected, and the friction between the moving and static contacts needs to be overcome when the moving and static contacts are in contact, which reduces the connection and disconnection speed. The present invention provides a moving contact assembly for a rotary isolating switch, and changes the moving contact piece of the moving contact assembly from a fixed installation to an elastic installation, thereby avoiding the plastic deformation of the moving contact piece of the moving contact assembly caused by multiple connections and disconnections. At the same time, it effectively reduces the friction generated by the contact between the moving contact piece and the static contact, extends the service life of the moving contact piece, and improves the disconnection speed of the moving contact and the static contact. The volume of the entire mechanism remains basically unchanged, saving production costs.

[0005] Technical solution:

[0006] In order to achieve the above technical objectives, the present embodiment designs a moving contact assembly of a rotary isolating switch, characterized in that it 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 moving contact piece is installed in the open space. The elastic element is placed in the open space with one end abutting the moving contact piece and the other end abutting the upper shell so that the moving contact piece can move up and down in the open space.

[0007] Preferably, the upper shell and the lower shell are made of insulating material, and the moving contact piece is made of conductive material.

[0008] Preferably, the movable contact piece can only move up and down in the open space.

[0009] 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.

[0010] Preferably, the upper shell and the lower shell are connected by snap connection, welding or gluing.

[0011] Preferably, the shape of the movable contact piece corresponds to the open space, and the movable contact piece is located on the central axis after the upper shell and the lower shell are assembled together.

[0012] Furthermore, a connecting block extends from the upper surface of the upper shell, and a connecting groove corresponding to the connecting block is provided on the lower surface of the lower shell.

[0013] The present invention also provides an arc striking module for a rotary isolating switch, characterized in that it includes the above-mentioned moving contact assembly of a rotary isolating switch, the lower shell of the moving contact assembly is installed in the contact mounting groove of the contact housing, 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 housing, the arc striking piece is installed in the arc striking groove of the contact housing, and the arc striking head of the arc striking piece is placed on one side of the static contact to introduce the arc when the moving contact piece and the static contact piece are disconnected into the exhaust port of the contact housing.

[0014] Preferably, the arc-striking pieces are made of conductive metal, and at least two of the arc-striking pieces are located outside the movement trajectory of the moving contact piece.

[0015] Furthermore, the arc-striking piece includes an arc-striking head and a mounting end, and the arc-striking head is hook-shaped.

[0016] The present invention also provides an arc limiting path module for a rotary disconnector, characterized in that it includes the above-mentioned arc striking module of a rotary disconnector, the moving contact assembly of the arc striking module is equipped with an arc limiting block on the rotation trajectory of the contact housing, the arc limiting block is installed in the inner cavity of the contact housing and is located below the moving contact piece, the upper surface of the arc limiting block is provided with an arc striking groove, and the arc striking groove is located on the arc limiting block and passes through the two side ends corresponding to the moving contact piece and the static contact piece.

[0017] Preferably, the arc limiting block is made of high temperature resistant insulating material.

[0018] Furthermore, the arc limiting block is provided with a positioning block, the positioning block is installed in the positioning groove of the contact housing, and there are at least two arc limiting blocks.

[0019] Preferably, the arc limiting block is circular or fan-shaped.

[0020] Preferably, the arc striking groove is in a continuous wave shape or a continuous "X" shape.

[0021] The present invention further provides a rotary disconnector, characterized in that it includes the above-mentioned moving contact assembly of the rotary disconnector or the above-mentioned arc striking module of the rotary disconnector or the above-mentioned arc path limiting module of the rotary disconnector.

[0022] Beneficial effects

[0023] The present invention provides a moving contact assembly for a rotary isolating switch, wherein the moving contact piece is a single-piece type, has a small size, is light in weight, has a smaller moment of inertia than the traditional multi-piece type, and can rotate at a faster speed. Secondly, the moving contact piece can move up and down along the axial direction in the upper shell of the mechanism, can better cross the friction surface, and speed up the movement. Moreover, the moving contact piece and the static contact piece are in single-sided contact, with a small contact area and low friction. At the same time, the moving contact piece is subjected to pressure in parallel by the elastic element, and does not deform itself. Compared with the traditional situation where pressure is generated by deformation, the moving contact piece does not generate stress, reduces fatigue strength, and can extend its service life. The present invention also provides an arc striking module for a rotary isolating switch, which is made of metal and is resistant to electrical corrosion, and a limiting arc path module for a rotary isolating switch, which can quickly attract and discharge the generated plasma arc to the outside of the product, and the corrosion of the arc is borne by it, ensuring that the arc does not corrode and damage the internal structure of the product, thereby improving the disconnection speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attachment Figure 1 This is a product diagram of the moving contact assembly in an embodiment of the present invention.

[0025] Attachment Figure 2 2 is a schematic structural diagram of a moving contact assembly in an embodiment of the present invention.

[0026] Attachment Figure 3 It is a bottom view of the moving contact assembly in an embodiment of the present invention.

[0027] Attachment Figure 4 This is a product picture of the arc starting plate in an embodiment of the present invention.

[0028] Attachment Figure 5 This is a product diagram of the arc limiting block in an embodiment of the present invention.

[0029] Attachment Figure 6 It is a front view of the arc limiting block in an embodiment of the present invention.

[0030] Attachment Figure 7 2 is a product diagram of a contact housing in an embodiment of the present invention.

[0031] Attachment Figure 8 Schematic diagram of the positions of the arc striking piece and the arc limiting block in an embodiment of the present invention.

[0032] Attachment Figure 9 1 is an exploded view of a rotary isolating switch according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Example

[0035] As attached Figure 1、 2 As shown in Figure 3, a movable contact assembly for a rotary disconnect switch includes an upper housing 1 and a lower housing 2. The upper housing 1 and the lower housing 2 are made of insulating material and are assembled together by snap-fit ​​connection, welding, or gluing. When the upper housing 1 and the lower housing 2 are assembled, an open space 4 is formed between the lower surface of the upper housing 1 and the upper surface of the lower housing 2. A movable contact 5 is mounted within the open space 4. An elastic element 6 is positioned within the open space 4, with one end abutting against the movable contact 5 made of conductive material and the other end abutting against the mounting groove 101 of the upper housing 1, enabling the movable contact 5 to move up and down within the open space 4. In this embodiment, the movable contact 5 can only move up and down within the open space 4 and cannot flip or move in other directions. The shape of the movable contact 5 corresponds to the open space 4, limiting its horizontal movement. The movable contact 5 is located on the central axis of the upper and lower housings 1 and 2 when assembled.

[0036] The elastic element 6 is a compression spring or a tension spring or a spring. In this embodiment, the elastic element 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 to enable multiple moving contact assemblies to be stacked and connected. When multiple moving contact assemblies are stacked together, they have a common axis and can rotate synchronously. The moving contact assembly is as shown in the attached figure. Figure 7 When the contact housing 7 of the rotary disconnector shown rotates to the ON position, the movable contact 5 connects with the stationary contact 801, forming an insulating space between the movable contact assembly and the contact housing 7, ensuring insulation between the movable contact, the stationary contact, and other components. At the same time, the elastic element 6 provides downward pressure when the contacts make contact, ensuring contact reliability.

[0037] In addition, this embodiment also provides an arc striking module for a rotary isolating switch, which includes the above-mentioned moving contact assembly of a rotary isolating switch, wherein the lower housing 2 of the moving contact assembly is mounted in the contact mounting groove 701 of the contact housing 7, and the lower housing 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 connect or disconnect with the static contact piece 801 of the static contact 8, and the connecting portion of the static contact 8 is fixed in the static contact mounting groove 702 of the contact housing 7 with screws, as shown in the attached figure. Figure 8 As shown, two arc-starting pieces 9 made of conductive metal are installed in the arc-starting groove 703 of the contact housing 7 and are located outside the moving track of the moving contact piece. Figure 4As shown, the arc-striking piece 9 includes an arc-striking head 901 and a mounting end 902. The arc-striking head 901 is hook-shaped and is placed on one side of the static contact 8 to guide the arc generated when the moving contact piece 5 and the static contact piece 801 are disconnected to the exhaust port 704 of the contact housing 7 for discharge.

[0038] The arc-striking module's function is to cause the movable contact piece 5, in addition to its horizontal rotational motion, to undergo axial vertical movement under the pressure of the elastic element 6 as the movable contact assembly rotates from the on position to the off position, allowing it to pass through the protruding insulating portion of the contact housing. When the movable contact piece 5 is a certain distance away from the stationary contact piece 801 and reaches the exhaust port 704 of the contact housing 7, it releases a cloud of free electrons into the exhaust port 704. This cloud of free electrons is then expelled from the contact housing 7 through the exhaust port 704 and the arc-striking piece 9, extinguishing the arc.

[0039] This embodiment also provides a rotary disconnector arc path limiting module including the arc striking module. The moving contact assembly of the arc striking module is equipped with two arc limiting blocks 10 made of high temperature resistant insulating material on the rotation track of the contact housing 7. In this embodiment, the arc limiting blocks 10 are made of ceramic. Figure 8 As shown, the arc limiting block 10 is installed in the inner cavity of the contact housing 7 and is located below the moving contact piece 5. Figure 5 and 6 As shown, the arc limiting block 10 is provided with a positioning block 1002, which is installed in the positioning groove 705 of the contact housing 7 to fix the arc limiting block 10 in the contact housing 7. The upper surface of the arc limiting block 10 is provided with an arc striking groove 1001, which is located on the two side ends of the arc limiting block 10 corresponding to the moving contact piece and the static contact piece 801 and passes through. The arc limiting block 10 is circular or fan-shaped. The arc striking groove 1001 is in a continuous wave shape or a continuous "X" shape. The arc limiting block 10 in this embodiment is fan-shaped. When the moving contact 5 moves from the connection state to the disconnection state, the moving contact assembly, the contact housing 7, and the arc limiting block 10 form an insulating space. The moving contact 5 moves a certain distance away from the static contact 801 and reaches the exhaust port 704 of the contact housing 7. At this time, the moving contact 5 can release the free electron cloud into the space, and some of the free electron cloud is expelled 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 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. 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 in the arc striking groove 1001, completing the function of disconnecting the arc.

[0040] This embodiment also provides a rotary isolating switch, which includes the above-mentioned moving contact assembly of the rotary isolating switch or the above-mentioned arc striking module or the above-mentioned arc path limiting module of the rotary isolating switch. Figure 9 As shown, a rotary disconnector drives the moving contact assembly to rotate by an operating mechanism 3 to achieve the purpose of connecting and disconnecting the circuit.

[0041] The structures, proportions, sizes, quantities, etc. illustrated in the drawings of this embodiment are only used to match the contents disclosed in this specification for understanding and reading by those familiar with this technology. They are not intended to limit the conditions under which this embodiment can be implemented, and therefore have no substantial technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and purpose of this embodiment, should still fall within the scope of the technical content disclosed in this embodiment. At the same time, terms such as "upper," "lower," "left," "right," "center," "clockwise," and "counterclockwise" used in this specification are only used to facilitate clarity of description and are not intended to limit the scope of the implementation of this embodiment. Changes or adjustments in their relative relationships, without substantially changing the technical content, should also be considered within the scope of the implementation of this embodiment.

Claims

1. An arc striking module for a rotary disconnector, characterized in that: The invention relates to a movable contact assembly of a rotary isolating switch, wherein the movable contact assembly comprises an upper shell (1) and a lower shell (2), wherein the upper shell (1) and the lower shell (2) are assembled together, and an open space (4) is formed between the lower surface of the upper shell (1) and the upper surface of the lower shell (2) after the upper shell (1) and the lower shell (2) are assembled together, wherein a movable contact piece (5) is arranged in the open space (4), and 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); the movable contact piece (5) can rotate in a horizontal position and can also move axially up and down under the action of the pressure of the elastic element (6). The lower housing (2) is mounted in the contact mounting groove (701) of the contact housing (7); the lower housing (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 static contact (8) is mounted in the static contact mounting groove (702) of the contact housing (7); the arc striking piece (9) is mounted in the arc striking groove (703) of the contact housing (7); the arc striking head (901) of the arc striking piece (9) is placed on one side of the static contact (8) and can guide the arc generated when the moving contact piece (5) and the static contact piece (801) are disconnected into the exhaust port (704) of the contact housing (7) for discharge.

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

3. The arc striking module of a rotary disconnector according to claim 1, characterized in that: The movable contact piece (5) can only move up and down in the open space (4).

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

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

6. The arc striking module of a rotary disconnector according to claim 1, 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.

7. The arc striking module of a rotary disconnector according to claim 1, characterized in that: 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).

8. The arc striking module of a rotary disconnector according to claim 1, characterized in that: The arc-striking pieces (9) are made of conductive metal, and at least two of the arc-striking pieces (9) are located outside the movement track of the moving contact piece (5).

9. The arc striking 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.

10. An arc path limiting module for a rotary disconnector, characterized by: It includes an arc striking module of a rotary disconnector as described in any one of claims 1 to 9, wherein the moving contact assembly of the arc striking module is provided with an arc limiting block (10) on the rotation trajectory of the contact housing (7), and the arc limiting block (10) is installed in the inner cavity of the contact housing (7) below the moving contact piece (5), and 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 on the arc limiting block (10) and passes through the two side ends corresponding to the moving contact piece (5) and the static contact piece (801).

11. The arc path limiting module of a rotary disconnector according to claim 10, characterized in that: The arc limiting block (10) is made of high-temperature resistant insulating material.

12. The arc path limiting module of a rotary disconnector according to claim 10, 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).

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

14. The arc path limiting module of a rotary disconnector according to claim 10, characterized in that: The arc striking groove (1001) is in a continuous wave shape or a continuous "X" shape.

15. A rotary isolating switch, characterized in that: It comprises an arc striking module of a rotary disconnector according to any one of claims 1 to 9 or an arc path limiting module of a rotary disconnector according to any one of claims 10 to 14.

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