Contact system of isolating switch and isolating switch

Abstract

A contact system of an isolating switch and the isolating switch, the isolating switch comprises an operating mechanism and at least one contact system, the operating mechanism and the contact system are stacked, and the operating mechanism is connected with a rotating part of the contact system; the contact system comprises a shell, a moving contact assembly, a static contact and an arc extinguish chamber, the moving contact assembly, the static contact and the arc extinguish chamber are arranged in the shell, the moving contact assembly comprises a rotating part and a moving contact, the arc extinguish chamber comprises an arc extinguish cover, a plurality of arc extinguish grid pieces and a permanent magnet, and the permanent magnet is arranged on the arc extinguish cover and located between the arc extinguish grid pieces and the rotating part. The arc-extinguishing grid sheets are provided with gaps facing the permanent magnet, the gaps of the plurality of arc-extinguishing grid sheets form an arc channel, during opening action, an arc passes through the arc channel along with the moving contact, at the moment, the arc is located in the arc channel formed by the arc-extinguishing grid sheets and is concentrated on one side of the permanent magnet, and under the action of Lorentz force generated by the permanent magnet, the permanent magnet is separated from the moving contact. The arc can be quickly led to the arc extinguishing grid sheets, the arcing time is shortened, and the breaking reliability of the switching device is improved.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to a contact system of a disconnector and a disconnector. Background Art

[0002] Disconnectors are widely used in power systems and are very important components. At present, during the process of line maintenance work, in order to ensure the safety of operators, it is necessary to use a disconnector to disconnect the equipment or line to be repaired from the power supply. The disconnector realizes the opening and closing function of the circuit by moving the moving contact to different positions. In the prior art, a metal arc extinguishing grid plate assembly is usually added in the switch device, or permanent magnet arc extinguishing is adopted to deal with the situation of small current arc extinguishing. However, the prior art has a poor arc extinguishing effect on high-voltage and large-current switch devices, prolongs the arcing time, and easily causes contact ablation. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome at least one defect of the prior art and provide a contact system of a disconnector.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A contact system of a disconnector includes a moving contact assembly, a static contact and an arc extinguishing chamber. The moving contact assembly includes a rotating part and a moving contact. The moving contact is installed on the rotating part. The rotating part drives the moving contact to rotate to contact or disconnect from the static contact. The arc extinguishing chamber includes an arc extinguishing cover, a plurality of arc extinguishing grid plates and a permanent magnet. The permanent magnet is arranged on the arc extinguishing cover and is located between the arc extinguishing grid plates and the rotating part. The arc extinguishing grid plates are provided with notches facing the direction of the permanent magnet. The notches of the plurality of arc extinguishing grid plates form an arc channel.

[0006] Further, the permanent magnet includes a first permanent magnet and a second permanent magnet arranged at intervals. When the moving contact rotates, it can extend into the notch of the arc extinguishing grid plate through the gap between the first permanent magnet and the second permanent magnet.

[0007] Further, the arc extinguishing grid plates include two notch side plates arranged at intervals to form the notch. The first permanent magnet and the second permanent magnet are respectively opposite to the ends of the two notch side plates facing the rotating part.

[0008] Further, the arc extinguishing cover includes an upper shell and a lower shell. The arc extinguishing grid plates are installed between the upper shell and the lower shell. At one end of the upper shell and the lower shell close to the rotating part, there are two permanent magnet installation bosses protruding towards each other. There are installation grooves in the two permanent magnet installation bosses. The first permanent magnet and the second permanent magnet are respectively installed in the installation grooves of the upper shell and the lower shell.

[0009] Further, the first permanent magnet and the second permanent magnet are arranged with the same poles facing each other.

[0010] Further, the moving contact moves along an arc path, the static contact is arranged at one end of the path, the arc extinguishing cover is in a fan-shaped ring covering the path, and the distance between the inner arc and the rotating part is within 5 mm.

[0011] Further, the arc extinguishing grid sheets are distributed in a fan shape along the outer arc of the arc extinguishing cover along the path, and the permanent magnets are arranged in an arc shape along the inner arc.

[0012] Further, the moving contact rotates between the opening position and the closing position. When rotating to the opening position, the moving contact and the static contact are respectively located at both ends of the arc channel; when rotating to the closing position, the moving contact is connected to the static contact and is located at the same end of the arc channel.

[0013] Further, the arc extinguishing grid sheets are metal grid sheets, including at least one first grid sheet and several second grid sheets. The material thickness of the first grid sheet is greater than that of the second grid sheet, and the first grid sheet is arranged on the outermost side of the arc extinguishing grid sheets.

[0014] Further, the static contact is arranged on the side where the first grid sheet is installed.

[0015] Further, a second contact is provided on the static contact. The second contact is perpendicular to the static contact and extends towards the arc channel; the second contact is a knife-shaped contact, the arc surface of the knife-shaped contact faces the notch, and the tip extends towards the first grid sheet. A clamping gap for clamping the second contact is provided at the end of the moving contact, and the second contact can be inserted into the clamping gap.

[0016] Further, the arc extinguishing cover is made of gas-generating material.

[0017] Further, it includes two groups of static contacts and two groups of arc extinguishing chambers arranged in the housing. The rotating part is located at the center of the housing. The moving contact penetrates through the rotating part and clamping gaps for cooperating with the two groups of static contacts are provided at both ends. The housing is rectangular. The two groups of arc extinguishing chambers are symmetrically arranged on the two radial sides of the rotating part and are located at two opposite corners of the rectangular housing. The two groups of static contacts are symmetrically arranged on the other two radial sides of the rotating part.

[0018] An isolating switch includes an operating mechanism and any one of the contact systems described above. The operating mechanism and the contact system are arranged in a stacked manner, and the operating mechanism is connected to the rotating part of the contact system.

[0019] In the contact system of the isolating switch of the present utility model, during the opening operation, the arc follows the moving contact through the arc channel. At this time, the arc is located in the arc channel formed by the arc extinguishing grid sheets and is concentrated on one side of the permanent magnet. Under the action of the Lorentz force generated by the permanent magnet, the arc can be quickly guided to the arc extinguishing grid sheets, shortening the arcing time and improving the breaking reliability of the switching device.

[0020] In addition, since the first permanent magnet and the second permanent magnet are respectively arranged on both sides of the moving contact movement path, and the same poles of the first permanent magnet and the second permanent magnet face each other, the arc is stretched through the magnetic field, and the arc is quickly introduced into the arc extinguishing grid, making the arc column elongated and the arc voltage increased, realizing rapid arc extinguishing.

[0021] In addition, the split arc extinguishing cover is convenient for maintenance and overhaul. When damaged, it is easy to replace the damaged parts, reducing the maintenance cost and saving the maintenance time.

[0022] In addition, the permanent magnet and the arc extinguishing grid cover a large area of the opening and closing movement trajectories, which can ensure that the permanent magnet can immediately exert the influence of the Lorentz force on the arc at the initial stage of the arc formation, prompting the arc to quickly enter the arc extinguishing grid and realizing rapid arc extinguishing.

[0023] In addition, when opening the circuit, the arc is first led to the first grid with a thicker material. The thicker first grid can effectively resist the ablation of the large arc and extend the service life. Since the distance between the first grid and the static contact is very small, when the moving contact and the second contact are just separated, an arc with a large amount of energy is generated. By quickly leading the arc to the thicker first grid, the contact is protected from being severely burned. Brief Description of the Drawings

[0024] Figure 1 is a schematic diagram of the connection relationship of the contact system of the present utility model;

[0025] Figure 2 is a schematic structural diagram of the contact system of the present utility model; [[ID=2,1]]

[0026] Figure 3 is a schematic diagram of the positional relationship among the moving contact assembly, the permanent magnet and the arc extinguishing grid of the present utility model;

[0027] Figure 4 is a structural diagram of the contact system of the present utility model in the closing state;

[0028] Figure 5 is a schematic structural diagram of the arc extinguishing chamber of the present utility model;

[0029] Figure 6 is a schematic structural diagram of the upper housing and the lower housing of the present utility model;

[0030] Figure 7 is a schematic structural diagram of the static contact of the present utility model;

[0031] Figure 8 is a schematic diagram of the cooperation relationship between the static contact and the arc extinguishing chamber of the present utility model;

[0032] Description of reference numerals: arc extinguishing chamber 1, arc extinguishing cover 10, upper housing 10-1, lower housing 10-2, arc extinguishing grid plates 11, notch side plates 110, first grid plate 11-1, second grid plate 11-2, permanent magnet 13, first permanent magnet 13-1, second permanent magnet 13-2, mounting groove 130, mounting hole 131, arc channel 14, moving contact assembly 2, moving contact 21, static contact 3, second contact 31, housing 4, rotating part 5, path 6. Detailed implementation manners

[0033] The following embodiments given in conjunction with the accompanying drawings further illustrate the detailed implementation manners of the disconnector of the present utility model. The disconnector of the present utility model is not limited to the descriptions of the following embodiments.

[0034] As Figure 1 shown, the disconnector of this embodiment includes an operating mechanism (not shown in the figure) and at least one contact system. The operating mechanism and the contact system are stacked, and the operating mechanism and the moving contact assembly 2 of the contact system are spliced through a linkage. The moving contact assemblies 2 of adjacent contact systems are connected. The contact system drives the moving contact assembly 2 to rotate to contact or separate from the static contact 3 through the operating mechanism, so as to realize the connection and disconnection of the internal circuit of its unit.

[0035] As Figure 1 、 4 shown, the contact system includes a housing 4, and a contact system and an arc extinguishing chamber 1 arranged inside the housing 4. The contact system includes a moving contact assembly 2 and a static contact 3. The moving contact assembly 2 includes a rotating part 5 and a moving contact 21. The operating mechanism is connected to the rotating part 5 of the contact system. The operating mechanism drives the moving contact assembly 2 to rotate through the rotating part 5. The moving contact 21 is arranged on the moving contact assembly 2. Specifically, the moving contact 21 is mounted on the rotating part 5. When the moving contact assembly 2 rotates, it drives the moving contact 21 to perform a circular motion. For the convenience of description, the arc-shaped trajectory passed by the part of the moving contact 21 used to contact the static contact 3 is called a path 6. The static contact 3 is arranged at one end of the path 6. The rotating part 5 drives the moving contact 21 to rotate to contact or disconnect from the static contact 3 to realize the connection and disconnection of the circuit.

[0036] Further, as a preferred embodiment of the contact system, it includes two sets of static contacts 3 and two sets of arc extinguishing chambers 1 arranged in the housing 4. A part of the static contact 3 extends out of the housing 4 for connection with an external circuit. The rotating part 5 is located at the center of the housing 4. The moving contact 21 penetrates through the rotating part 5 and rotates with the rotating part 5 to cooperate with the static contact 3. The housing 4 is rectangular. The two sets of arc extinguishing chambers 1 are symmetrically arranged on both radial sides of the rotating part 5 and are located at two opposite corners of the rectangular housing 4. The two sets of static contacts 3 are symmetrically arranged on the other two radial sides of the rotating part 5. During the opening and closing operations, the rotating part 5 rotates around its axis, driving the moving contacts 21 at both ends to respectively contact and disconnect from the two static contacts 3 through the arc extinguishing chambers 1.

[0037] As Figure 1-2 shown, as an embodiment of the arc extinguishing chamber 1, the arc extinguishing chamber 1 is arranged on the movement path of the moving contact assembly 2 and is used to extinguish the arc generated when the contact system opens. It includes an arc extinguishing cover 10, a plurality of arc extinguishing grid sheets 11, and a permanent magnet 13. The number of arc extinguishing grid sheets 11 is not specifically limited and can be adjusted according to the actual situation. The permanent magnet 13 is arranged on the arc extinguishing cover 10 and is located between the arc extinguishing grid sheets 11 and the rotating part 5. The magnetic field generated by the permanent magnet 13 will cover the area where the arc extinguishing grid sheets 11 are located, so that the arc is drawn into the arc extinguishing grid sheets 11 under the action of the magnetic field. Further, the arc extinguishing grid sheets 11 are provided with notches facing the direction of the permanent magnet 13. The notches of the plurality of arc extinguishing grid sheets 11 form an arc channel 14. During the opening operation, the arc passes through the arc channel 14 along with the moving contact 21. At this time, the arc is located in the arc channel 14 formed by the arc extinguishing grid sheets 11 and is concentrated on one side of the permanent magnet 13. Under the action of the Lorentz force generated by the permanent magnet 13, the arc can be quickly led to the arc extinguishing grid sheets 11, shortening the arcing time and improving the breaking reliability of the switching device.

[0038] Further, as Figure 3 shown, the permanent magnet 13 includes a first permanent magnet 13-1 and a second permanent magnet 13-2 arranged at intervals. The first permanent magnet 13-1 and the second permanent magnet 13-2 are respectively located on both axial sides of the path 6 along the rotating part 5. That is to say, when the moving contact 21 rotates, it can extend into the notch of the arc extinguishing grid sheet 11 through the gap between the first permanent magnet 13-1 and the second permanent magnet 13-2.

[0039] Preferably, the arc extinguishing grid 11 includes two notch side plates 110 that are spaced apart and form the notch. The positions of the notch side plates 110 correspond to the permanent magnets 13. To minimize the volume of the arc extinguishing chamber 1 and save space, the first permanent magnet 13-1 and the second permanent magnet 13-2 are respectively facing the ends of the two notch side plates 110 towards the rotating part 5. In this way, the positions of the permanent magnets 13 and the arc extinguishing grid 11 are flush with each other in the axial direction of the rotating part 5, making the structure of the arc extinguishing chamber 1 more compact and beautiful. Of course, in other embodiments, the first permanent magnet 13-1 and the second permanent magnet 13-2 can also be slightly misaligned with the two notch side plates 110 in the axial direction of the rotating part 5, but in the radial direction of the rotating part 5, they need to be located between the rotating part 5 and the arc extinguishing grid 11.

[0040] Preferably, the first permanent magnet 13-1 and the second permanent magnet 13-2 are symmetrically arranged to ensure uniform distribution of the magnetic field in the arc extinguishing area, avoid arc deviation caused by uneven magnetic field, and improve stability.

[0041] Preferably, the first permanent magnet 13-1 and the second permanent magnet 13-2 are arranged with the same poles facing each other. While stretching the arc, it meets the requirement of non-polarity. Whether the static contact 3 is connected to the external circuit in the positive or negative direction, the arc will be subjected to the Lorentz force in the direction away from the static contact 3.

[0042] Since the first permanent magnet 13-1 and the second permanent magnet 13-2 are respectively arranged on both sides of the movement path 6 of the moving contact 21, and the first permanent magnet 13-1 and the second permanent magnet 13-2 are arranged with the same poles facing each other, the arc is stretched by passing through the magnetic field, quickly introduced into the arc extinguishing grid 11, the arc column is elongated, and the arc voltage is increased, realizing rapid arc extinguishing.

[0043] As Figure 5-6 shown, an arc extinguishing cover 10 of this embodiment is provided. The arc extinguishing cover 10 includes an upper housing 10-1 and a lower housing 10-2. The arc extinguishing grid 11 is installed between the upper housing 10-1 and the lower housing 10-2. Specifically, mounting holes 131 corresponding to the arc extinguishing grid 11 are provided on the upper housing 10-1 and the lower housing 10-2. The arc extinguishing grid 11 is arranged at one end of the upper housing 10-1 and the lower housing 10-2 away from the rotating part 5 through the mounting holes 131; at one end of the upper housing 10-1 and the lower housing 10-2 close to the rotating part 5, there are two permanent magnet mounting bosses protruding towards each other. Mounting grooves 130 are provided in the two permanent magnet mounting bosses. The first permanent magnet 13-1 and the second permanent magnet 13-2 are respectively installed in the mounting grooves 130 of the upper housing 10-1 and the lower housing 10-2. The split-type arc extinguishing cover 10 is convenient for maintenance and repair. When damaged, it is easy to replace the damaged parts, reducing the maintenance cost and saving the repair time.

[0044] Of course, the arc extinguishing cover 10 can also adopt other structures. For example, the upper housing 10-1 and the lower housing 10-2 are integrally designed and an air outlet is provided at one end far from the rotating part 5, and the arc extinguishing grid 11 is arranged inside the arc extinguishing cover 10. This is the prior art and will not be elaborated here. In addition, the connection methods of the arc extinguishing grid 11 and the permanent magnet 13 to the arc extinguishing cover 10 are not limited to the description of this embodiment, as long as the positional relationships among the arc extinguishing grid 11, the permanent magnet 10, and the rotating part 5 are satisfied.

[0045] As Figure 1-2 shown, the arc extinguishing cover 10 covers the path 6 in a fan-shaped ring. While not affecting the movement of the moving contact assembly 2, it covers the movement trajectory of the moving contact as much as possible to improve the arc extinguishing efficiency. The distance between the inner arc of the fan-shaped arc extinguishing cover 10 and the rotating part 5 is within 5 mm. Preferably, the distance between the inner arc of the arc extinguishing cover 10 and the rotating part 5 is between 0.5 mm and 2 mm.

[0046] Furthermore, the arrangement of the arc extinguishing grids 11 and the shape of the permanent magnet 13 correspond to the path 6. Combined with the fan-shaped arc extinguishing cover 10, the arc extinguishing chamber 1 better fits the movement trajectory during opening and closing. Specifically, the arc extinguishing grids 11 are distributed in a fan shape along the outer arc of the arc extinguishing cover 10 along the path 6, and the permanent magnet 13 is arranged in an arc shape along the inner arc. With the permanent magnet 13 and the arc extinguishing grids 11 arranged in this way, a large area covers the movement trajectory of opening and closing, which can ensure that the permanent magnet 13 can immediately exert the influence of the Lorentz force on the arc at the initial stage of arc formation, prompting the arc to quickly enter the arc extinguishing grids 11 and achieving rapid arc extinguishing.

[0047] As Figure 1 、 4 shown, the moving contact 21 rotates between the opening position ( Figure 1 ) and the closing position ( Figure 4 ). The arc extinguishing chamber 1 is located between the moving contact 21 and the static contact 3. When the moving contact 21 is in the opening position, the moving contact 21 and the static contact 3 are respectively located at both ends of the arc channel 14. At this time, rotate the moving contact assembly 2 to make the moving contact 21 move along the path 6 towards the static contact 3 and enter the arc extinguishing chamber 1 from one side and rotate towards the closing position; when rotated to the closing position, the moving contact 21 is connected to the static contact 3 and is located at the same end of the arc channel 14. Similarly, during the opening operation, the moving contact 21 moves through the arc extinguishing chamber 1 towards the opening position.

[0048] As Figure 8As shown in the figure, as an embodiment of the arc extinguishing grid piece 11, the arc extinguishing grid piece 11 is a metal grid piece, including at least one first grid piece 11-1 and several second grid pieces 11-2. Among them, the number of the second grid pieces 11-2 is not limited and can be increased or decreased according to actual needs. The material thickness of the first grid piece 11-1 is greater than that of the second grid piece 11-2 to obtain higher ablation resistance. The first grid piece 11-1 is arranged on the outermost side of the arc extinguishing grid piece 11 and is used to contact the arc first. In this way, when the switch is opened, the arc is first led to the first grid piece 11-1 with a thicker material. The thicker first grid piece 11-1 can effectively resist the ablation of the large arc and extend the service life.

[0049] Further, as Figure 1 、 Figure 7-8 shown in the figure, the static contact 3 is arranged on the side where the first grid piece 11-1 is installed to ensure that the arc contacts the first grid piece 11-1 first. A second contact 31 is also provided on the static contact 3. The second contact 31 is used to contact the moving contact 21 and is as close as possible to the arc channel 14 so that the arc can quickly enter the arc extinguishing cover 10. Specifically, the second contact 31 is perpendicular to the static contact 3 and extends towards the arc channel 14; preferably, the second contact 31 is designed as a knife-shaped contact, including two straight edges and an arc-shaped edge. One of the straight edges is connected to the static contact 3. After connection, the second contact 31 is perpendicular to the static contact 3. The arc surface of the knife shape faces the notch, and the tip extends towards the first grid piece 11-1 and is close to the first grid piece 11-1; a clamping gap for clamping the second contact 31 is provided at the end of the moving contact 21. When the moving contact 21 contacts the static contact 3, the second contact 31 can be inserted into the clamping gap. In this way, since the distance between the first grid piece 11-1 and the static contact 3 is very small, when the moving contact 21 and the second contact 31 are just separated, an arc with a large amount of energy is generated. By quickly leading the arc to the thicker first grid piece 11-1, the contacts are protected from serious ablation.

[0050] Preferably, the arc extinguishing cover 10 is made of a gas-generating material. When the switch is opened, the arc generated is more quickly led to the arc extinguishing grid piece 11 under the combined action of the Lorentz force generated by the permanent magnet 13 and the air flow, further improving the breaking reliability of the switching device. The above gas-generating material can use known materials in the prior art. As a preferred solution, the material itself does not fall within the protection scope of the present invention.

[0051] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are conventionally placed directions or positional relationships during use. They are intended solely for ease of description and do not imply that the devices or components referred to must have a specific direction. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating relative importance.

[0052] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A contact system of a disconnector, comprising a moving contact assembly (2), a static contact (3) and an arc extinguishing chamber (1). The moving contact assembly (2) includes a rotating part (5) and a moving contact (21). The moving contact (21) is installed on the rotating part (5), and the rotating part (5) drives the moving contact (21) to rotate to contact or disconnect from the static contact (3), characterized in that, The arc extinguishing chamber (1) includes an arc extinguishing cover (10), a plurality of arc extinguishing grid plates (11) and a permanent magnet (13). The permanent magnet (13) is arranged on the arc extinguishing cover (10) and is located between the arc extinguishing grid plates (11) and the rotating part (5). The arc extinguishing grid plates (11) are provided with notches facing the direction of the permanent magnet (13), and the notches of the plurality of arc extinguishing grid plates (11) form an arc channel (14).

2. The contact system according to claim 1, characterized in that, The permanent magnet (13) includes a first permanent magnet (13-1) and a second permanent magnet (13-2) which are arranged at intervals. When the moving contact (21) rotates, it can extend into the notch of the arc extinguishing grid plate (11) through the gap between the first permanent magnet (13-1) and the second permanent magnet (13-2).

3. The contact system according to claim 2, characterized in that, The arc extinguishing grid plate (11) includes two notch side plates which are arranged at intervals and form the notch. The first permanent magnet (13-1) and the second permanent magnet (13-2) respectively face the ends of the two notch side plates (110) towards the rotating part (5).

4. The contact system according to claim 2, characterized in that, The arc extinguishing cover (10) includes an upper shell (10-1) and a lower shell (10-2). The arc extinguishing grid plates (11) are installed between the upper shell (10-1) and the lower shell (10-2). At one end of the upper shell (10-1) and the lower shell (10-2) close to the rotating part (5), there are two permanent magnet mounting bosses protruding towards each other. An installation groove (130) is provided in the two permanent magnet mounting bosses. The first permanent magnet (13-1) and the second permanent magnet (13-2) are respectively installed in the installation grooves (130) of the upper shell (10-1) and the lower shell (10-2).

5. The contacting system according to claim 2, characterized in that, The first permanent magnet (13-1) and the second permanent magnet (13-2) are arranged with the same poles facing each other.

6. The contact system according to claim 1, characterized in that, The moving contact (21) moves along an arc path (6). The static contact (3) is arranged at one end of the path (6). The arc extinguishing cover (10) is in a fan-shaped ring and covers the path (6), and the distance between the inner arc and the rotating part (5) is within 5 mm.

7. The contact system according to claim 6, characterized in that, The arc extinguishing grid plates (11) are distributed in a fan shape along the outer arc of the arc extinguishing cover (10) along the path (6), and the permanent magnet (13) is arranged in an arc shape along the inner arc.

8. The contacting system according to claim 1, characterized in that, The moving contact (21) rotates between the opening position and the closing position. When rotating to the opening position, the moving contact (21) and the static contact (3) are respectively located at both ends of the arc channel (14); when rotating to the closing position, the moving contact (21) is connected to the static contact (3) and is located at the same end of the arc channel (14).

9. The contact system according to claim 1, characterized in that, The arc extinguishing grid plate (11) is a metal grid plate, including at least one first grid plate (11-1) and a plurality of second grid plates (11-2). The material thickness of the first grid plate (11-1) is greater than that of the second grid plate (11-2), and the first grid plate (11-1) is arranged on the outermost side of the arc extinguishing grid plate (11).

10. The contact system according to claim 9, characterized in that, The static contact (3) is arranged on the side where the first grid plate (11-1) is installed.

11. The contact system according to claim 10, characterized in that, The static contact (3) is provided with a second contact (31), which is perpendicular to the static contact (3) and extends towards the arc channel (14); the second contact (31) is a knife-shaped contact, the arc surface of the knife-shaped contact faces the notch, and the tip extends towards the first grid piece (11-1). A clamping gap for clamping the second contact (31) is provided at the end of the moving contact (21), and the second contact (31) can be inserted into the clamping gap.

12. The contact system according to claim 1, characterized in that, The arc extinguishing cover (10) is made of gas-generating material.

13. The contact system according to any one of claims 1 to 12, characterized in that, It includes two groups of static contacts (3) and two groups of arc extinguishing chambers (1) arranged in the housing (4). The rotating part (5) is located at the center of the housing (4). The moving contact (21) penetrates through the rotating part (5) and clamping gaps for cooperating with the two groups of static contacts (3) are provided at both ends. The housing (4) is rectangular. The two groups of arc extinguishing chambers (1) are symmetrically arranged on the two radial sides of the rotating part (5) and are located at two opposite corners of the rectangular housing (4). The two groups of static contacts (3) are symmetrically arranged on the other two radial sides of the rotating part (5).

14. An isolating switch, characterized in that, It includes an operating mechanism and a contact system as described in any one of claims 1-13. The operating mechanism and the contact system are stacked, and the operating mechanism is connected to the rotating part (5) of the contact system.

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