CN220171990U - Switch unit of isolating switch and isolating switch - Google Patents

Abstract

The utility model provides a switch unit and isolator of isolator, isolator includes switch unit and operating unit, switch unit includes casing and first stationary contact, second stationary contact and the contact support of setting up in the casing respectively, its characterized in that: the contact support is rotatably arranged in the shell, the rotation center of the contact support is arranged between the first fixed contact and the second fixed contact, the contact support is provided with a moving contact, the moving contact is connected with the first fixed contact through soft connection, the contact support is used for driving the moving contact to rotate with the rotation center of the contact support, the moving contact is enabled to rotate and contact and separate from the second fixed contact, the first fixed contact is provided with a welding surface used for being welded with the soft connection, the plate surface of the first fixed contact provided with the welding surface is in oblique angle with the welding surface, contact resistance is reduced, and temperature rise can be reduced.

Description

Switch unit of isolating switch and isolating switch

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to a switch unit of an isolating switch and the isolating switch.

Background

The switch unit of the isolating switch comprises a moving contact and two fixed contacts, wherein the two fixed contacts are symmetrically arranged on two sides of the moving contact, contact grooves are formed in two ends of the moving contact, one end of the moving contact is inserted into the contact grooves to contact with the moving contact through rotation of the moving contact, one end of the two fixed contacts is matched with the moving contact, and the other end of the two fixed contacts extends out of the shell to be used for wiring. The existing isolating switch conductive loop is characterized in that the contact supports to drive the moving contact to rotate so that two ends of the moving contact are simultaneously contacted with or separated from two fixed contacts, so that the conducting loop is conducted and disconnected, one ends of the two fixed contacts are difficult to be guaranteed to be accurately aligned with the contact grooves at two ends of the moving contact, the moving contact needs to be properly moved to adjust the position, the two fixed contacts are difficult to be guaranteed to be contacted with the contact grooves of the moving contact in a surface mode when the closing is difficult, and the problem that the moving contact is inclined to form point contact due to errors is generally caused. One end contact groove of a moving contact of the conventional other isolating switch conductive loop is rotatably arranged on one fixed contact through a shaft pin, the moving contact rotates by taking the fixed contact as a rotation center, and after the moving contact rotates, the fixed contact at the other side is inserted into the other end contact groove to contact, so that the problem of basically point contact between the two fixed contacts and the moving contact is also solved.

The point contact between the fixed contact and the moving contact can lead to large contact resistance of the conductive loop of the isolating switch, is easy to raise the temperature too high, and can hardly meet the temperature rise requirement under the condition of the same appearance size.

Disclosure of Invention

The object of the present utility model is to overcome at least one of the drawbacks of the prior art and to provide a switching unit for an disconnector.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a switch unit of isolator, includes the casing and sets up first stationary contact, second stationary contact and the contact support in the casing respectively, the contact support rotates and installs in the casing, the rotation center that the contact supported sets up between first stationary contact and second stationary contact, is equipped with the moving contact on the contact support, link to each other through soft connection between moving contact and the first stationary contact, the contact support is used for driving the moving contact and rotates with the rotation center that the contact supported to make the moving contact rotate with the contact of second stationary contact and separation, first stationary contact be equipped with be used for with soft connection welded the face of welding, the face of the first stationary contact that is equipped with the face of welding personally submit the oblique angle setting with the welding.

Preferably, the center line of the flexible connection is arranged at an oblique angle with the first fixed contact.

Preferably, the first stationary contact is provided with a welding groove, a welding surface is arranged at the bottom of the welding groove, the welding surface is in oblique angle with the first stationary contact, the flexible connection is provided with a positioning surface, when the positioning surface is in contact with the welding surface, the central line of the flexible connection is in oblique angle with the central line of the first stationary contact, a welding boss is arranged on the side surface of the first stationary contact in a protruding mode, and the welding groove is arranged in the welding boss.

Preferably, the flexible connection comprises a first welding end, a second welding end and a connecting part connected between the first welding end and the second welding end, wherein the first welding end and the second welding end are respectively used for welding with a first fixed contact and a moving contact, the connecting part comprises a first side edge and a second side edge which are oppositely arranged on two sides of a central line, and the first side edge and the second side edge are respectively arranged at an oblique angle with the first fixed contact.

Preferably, the included angle between the moving contact and the first fixed contact is alpha degrees when the moving contact is opened, the included angle between the moving contact and the first fixed contact is beta degrees when the moving contact is closed, and the included angle between the central line of the soft connection and the first fixed contact is smaller than alpha degrees or smaller than beta degrees.

Preferably, the movable contact comprises two clamping plates which are oppositely arranged, and two conductive plates which are arranged between the two clamping plates, the second fixed contact is used for being inserted between the two conductive plates, an elastic piece is arranged on the outer side of at least one clamping plate, and the elastic piece is used for driving the clamping plates to push the conductive plates to be pressed with the second fixed contact.

Preferably, the contact support is provided with a partition plate, the partition plate comprises a first partition part and a second partition part, the first partition part is arranged between the two conductive plates, the second partition part is arranged between flexible connections connected with the two conductive plates, and the second partition part is arranged at one end of the first partition part in a protruding mode.

Preferably, a radiator is arranged on the side face of the first fixed contact, and the radiator comprises a contact plate used for being in contact with the first fixed contact and a plurality of radiating fins respectively connected with the contact plate.

Preferably, the first fixed contact, the second fixed contact extend out of the wiring part outside the shell, and the rotation axes of the moving contacts are located on the same plane.

According to the switch unit of the isolating switch, the moving contact is not required to be directly rotatably arranged on the first fixed contact and is rotated by taking the first fixed contact as a rotation center, but the moving contact is connected with the first fixed contact through the soft connection, and the moving contact rotates by taking the rotation center supported by the contact, so that the moving contact and the rotation center supported by the contact are positioned between the first fixed contact and the second fixed contact, the existing structure is not required to be changed, and more contact areas are respectively arranged between the moving contact and the soft connection and between the soft connection and the first fixed contact, and further, the contact resistance is reduced and the temperature rise is reduced; meanwhile, as the space of the switch unit B of the isolating switch is limited, the length of the flexible connection is limited, and the flexible connection is driven to bend when the moving contact rotates, the flexible connection and the first fixed contact are in oblique angle welding, so that the flexible connection is bent into a certain angle in advance, the bending amount of the flexible connection can be reduced, the resistance generated by bending of the flexible connection is reduced, and the switching-on resistance is reduced.

In addition, the first stationary contact is provided with a welding surface and a welding boss which are arranged at an oblique angle, and when the positioning surface of the soft connection is contacted with the welding surface, the central line of the soft connection and the central line of the first stationary contact are arranged at an oblique angle, so that the soft connection can be conveniently welded.

In addition, the baffle is arranged in the contact support, so that the conductive plate of the movable contact can be positioned, the degree of freedom of flexible connection can be limited, and the reliability is improved.

The utility model also provides an isolating switch which comprises an operating unit and the plurality of switch units, wherein the plurality of switch units are stacked, and the operating unit is used for driving the contacts in the switch units to support rotation, and the contacts of two adjacent switch units support connection.

According to the isolating switch, the moving contact and the rotating center supported by the contact are positioned between the first fixed contact and the second fixed contact, so that the moving contact and the rotating center supported by the contact are positioned at the center of the shell of the switch unit, and the isolating switch has the characteristics of compact structure and small volume.

Drawings

FIG. 1 is a split state of an isolating switch of the present utility model;

FIG. 2 is a closing state of the isolating switch of the present utility model;

FIG. 3 is a schematic diagram of the structure of the inside of the isolating switch of the present utility model;

FIG. 4 is a side view of the flexible connection of the present utility model in a first embodiment;

FIG. 5 is a top view of the flexible connection of the present utility model in a first embodiment;

FIG. 6 is a side view of the flexible connection of the present utility model in a second embodiment;

FIG. 7 is a top view of the flexible connection of the present utility model in a second embodiment;

FIG. 8 is a schematic diagram of the first stationary contact and flexible connection of the present utility model;

FIG. 9 is a schematic view of the structure of a first stationary contact according to the present utility model;

FIG. 10 is a schematic view of the structure of the moving contact of the present utility model;

FIG. 11 is a schematic diagram of the structure of the isolating switch of the present utility model;

FIG. 12 is a schematic view of the internal structure of the disconnector of the present utility model;

in the figure, 1, a first fixed contact; 2. a second stationary contact; 3. a contact support; 4. a moving contact; 5. soft connection; 6. arc extinguishing grid plates; 7. a heat sink; 11. a welding groove; 12. a welding surface; 13. welding the boss; 51. a first welding end; 52. a second welding end; 53. a connection part; 54. a first side; 55. a second side; 41. a clamping plate; 42. a conductive plate; 43. a spring plate; 44. a third welding end; 31. an insertion structure; 32. a groove structure; 82. a second isolation part; 81. a first isolation part; A. an operation unit; B. and a switching unit.

Detailed Description

Specific embodiments of the disconnector according to the utility model are further described below with reference to the examples given in the accompanying drawings. The isolating switch of the present utility model is not limited to the description of the following embodiments.

As shown in fig. 1-4, a switch unit B of the isolating switch of the present utility model includes a housing, a first fixed contact 1, a second fixed contact 2 and a contact support 3 respectively disposed in the housing, the contact support 3 is rotatably mounted in the housing, a rotation center of the contact support 3 is disposed between the first fixed contact 1 and the second fixed contact 2, a moving contact 4 is disposed on the contact support 3, the moving contact 4 is connected with the first fixed contact 1 through a flexible connection 5, and the contact support 3 is used for driving the moving contact 4 to rotate with a rotation center of the contact support 3, and making the moving contact 4 rotate to contact with and separate from the second fixed contact 2. The flexible connection 5 and the first fixed contact 1 are in diagonal angle welding, that is, the first fixed contact 1 is provided with a welding surface 12 for welding with the flexible connection 5, and the plate surface of the first fixed contact 1 provided with the welding surface 12 and the welding surface 12 are in diagonal angle arrangement.

According to the switch unit B of the isolating switch, the moving contact 4 is not required to be directly rotatably arranged on the first fixed contact 1 and is rotated by taking the first fixed contact 1 as a rotation center, but the moving contact 4 is connected with the first fixed contact 1 through the soft connection 5, the moving contact 4 rotates by taking the rotation center of the contact support 3, the rotation centers of the moving contact 4 and the contact support 3 are positioned between the first fixed contact 1 and the second fixed contact 2, the existing structure is not required to be changed, and more contact areas are respectively arranged between the moving contact 4 and the soft connection 5 and between the soft connection 5 and the first fixed contact 1, so that the contact resistance is further reduced, and the temperature rise is reduced.

Meanwhile, as the space of the switch unit B of the isolating switch is limited, the length of the flexible connection 5 is limited, although the flexible connection 5 is driven to bend when the moving contact 4 rotates, the flexible connection 5 and the first fixed contact 1 are in diagonal welding, so that the flexible connection 5 is bent into a certain angle in advance, the bending amount of the flexible connection 5 can be reduced, the resistance generated by bending of the flexible connection 5 is reduced, and the switching-on resistance is reduced.

As shown in fig. 11-12, the utility model further provides an isolating switch, which comprises an operating unit a and a plurality of switch units B, wherein the switch units B are stacked, the operating unit a is used for driving a contact support 3 in the switch units B to rotate, the contact supports 3 of two adjacent switch units B are connected, and the operating unit a drives the switch units B to be switched on or off differently. The two ends of the contact support 3 are respectively provided with an inserting structure 31 and a groove structure 32, and the inserting structure 31 on one contact support 3 in two adjacent switch units B is used for being inserted into the groove structure 32 of the other contact support 1.

According to the isolating switch, the rotating centers of the moving contact 4 and the contact support 3 are positioned between the first fixed contact 1 and the second fixed contact 2, so that the rotating centers of the moving contact 4 and the contact support 3 can be positioned at the central position in the shell of the switch unit B, and the isolating switch has the characteristics of compact structure and small volume.

As shown in fig. 1-2, the first fixed contact 1 and the second fixed contact 2 are respectively disposed at two ends of the housing, the contact support 3 is disposed between the first fixed contact 1 and the second fixed contact 2, the moving contact 4 is mounted on the contact support 3, the first fixed contact 1 is electrically connected with the moving contact 4 through a flexible connection 5, the contact support 3 drives the moving contact 4 to contact and separate from the second fixed contact 2, and the isolating switch of the embodiment modifies a mating structure of simultaneously contacting and separating the moving contact 4 from the two fixed contacts into a structure electrically connected through the flexible connection to reduce temperature rise without changing the overall layout and size, so that the first fixed contact 1 can also be called a first contact plate. The flexible connection may be a braided wire or the like.

Preferably, the side of the second fixed contact 2 is provided with a plurality of arc extinguishing bars 6, the arc extinguishing bars 6 are used for cutting an arc, the side of the first fixed contact 1 is provided with a radiator 7, the radiator 7 is used for reducing the temperature of the first fixed contact 1, the radiator 7 comprises a contact plate used for contacting with the first fixed contact 1 and a plurality of radiating fins respectively connected with the contact plate, and the radiating fins are used for contacting with air and conducting the temperature of the first fixed contact 1 into the air so as to reduce the temperature of the first fixed contact 1.

The soft connection 5 and the first fixed contact 1 are welded in an oblique angle. The center line of the flexible connection 5 and the first fixed contact 1 are arranged at an oblique angle, or the first fixed contact 1 is provided with a welding surface 12 used for welding with the flexible connection 5, and the plate surface of the first fixed contact 1 provided with the welding surface 12 and the welding surface 12 are arranged at an oblique angle. In the closing process, the movable contact 4 can be contacted with the fixed contact 2 only by swinging, and the movable contact 4 can drive the flexible connection 5 to bend when rotating, but the flexible connection 5 bends in advance to a certain angle, so that the bending amount of the flexible connection 5 can be reduced, the resistance generated by bending the flexible connection 5 is reduced, and the closing resistance is reduced. The first fixed contact 1 is of an integral straight structure or a bending structure with a plurality of straight sections. If the first stationary contact 1 is in a bent structure, the plate surface of the first stationary contact 1 provided with the welding surface 12 refers to the plate surface of the straight section provided with the welding surface 12 in the bent structure of the first stationary contact 1.

Preferably, the two ends of the flexible connection are welded with the first fixed contact 1 and the moving contact 4 respectively, the central line of the flexible connection 5 and the first fixed contact 1 are arranged in an oblique angle, so that the bending degree of the flexible connection 5 can be reduced, and the flexible connection has the advantage of high reliability. The center line of the flexible connection 5 refers to a connecting line between center points of two ends of the flexible connection 5. The moving contact 4 comprises at least two conductive plates 42, a contact groove for being matched with the static contact is formed between the end parts of the two conductive plates 42, the second static contact 2 is used for being inserted between the two conductive plates 42, the plane of the flexible connection 5 is parallel to the plane of the conductive plates 42, the structure of the original moving contact 4 is maintained, and the assembly and the connection are facilitated. Specifically, as shown in fig. 1-2, the first fixed contact 1 and the second fixed contact 2 extend out of the wiring part of the shell, and the rotation axes of the moving contacts are located on the same plane, which is beneficial to wiring and assembling of the switch unit B; the first fixed contact 1 and the second fixed contact 2 both further comprise contact parts positioned in the shell, the wiring parts of the first fixed contact 1 and the second fixed contact 2 are used for being connected with an external conductor, the contact parts of the first fixed contact 1 are used for being welded with soft connection, the contact parts of the second fixed contact 2 are used for being matched with the movable contact 4, and the contact parts are inserted between the two conductive plates 42 of the movable contact 4. The contact part and the wiring part of the first fixed contact 1 are positioned in the same plane, and the plane of the soft connection is perpendicular to the plane of the first fixed contact 1.

As shown in fig. 4-5, in one embodiment, the first stationary contact 1 is provided with a welding groove 11, the welding groove 11 is disposed on the contact portion, the flexible connection 5 is inserted into the welding groove 11 and is welded with the first stationary contact 1, a welding surface 12 is disposed at the bottom of the welding groove 11, the welding surface 12 is disposed at an oblique angle with the surface of the first stationary contact 1, where the welding surface 12 is disposed at the surface of the first stationary contact 12, and the flexible connection 5 is provided with a positioning surface, where when the positioning surface contacts the welding surface 12, the center line of the flexible connection 5 is disposed at an oblique angle with the center line of the first stationary contact 1, so that the flexible connection 5 can be welded conveniently, and the flexible connection 5 and the center line of the first stationary contact 1 can be ensured to be disposed at an oblique angle conveniently.

As shown in fig. 8-9, the side surface of the first fixed contact 1 is provided with a welding boss 13, that is, the side surface of the welding groove 11 is convexly provided with the welding boss 13, and the welding groove 11 is arranged in the welding boss 13, so that the first fixed contact 1 and the welding boss 13 are not located on the same plane, one end of the flexible connection 5 connected with the first fixed contact 1 is not located on the same plane as the first fixed contact 1, and the flexible connection 5 and the first fixed contact 1 are ensured to be in an oblique angle arrangement. Preferably, the welding boss 13 is disposed at an oblique angle with the first fixed contact 1, the welding boss 13 may not be disposed at an oblique angle with the first fixed contact 1, and only the welding surface 12 is disposed at an oblique angle with the first fixed contact 1.

In addition, during welding, the soft connection 5 and the first fixed contact 1 can be limited at an oblique angle by means of an external tool, such as a clamp, and then welding is performed, and at this time, the welding position of the first fixed contact 1 and the soft connection 5 is the welding surface of the first fixed contact 1, which also belongs to the protection scope of the present utility model.

As shown in fig. 3, the flexible connection 5 includes a first welding end 51 and a second welding end 52, and a connection portion 53 connected between the first welding end 51 and the second welding end 52, where the first welding end 51 and the second welding end 52 are respectively used to weld with the first fixed contact 1 and the moving contact 4, the connection portion 53 includes a first side 54 and a second side 55 that are oppositely disposed at two sides of a central line, the central line of the connection portion 53 is disposed parallel to the first fixed contact 1, and the first side 54 and the second side 55 are respectively disposed at an oblique angle with the first fixed contact 1.

As shown in fig. 6, in this embodiment, the center line, the first side 54 and the second side 55 of the connecting portion 53 are disposed at oblique angles with respect to the first stationary contact 1.

Further, the included angle between the moving contact 4 and the first fixed contact 1 is alpha degrees when the moving contact 4 is switched on, the included angle between the moving contact 4 and the first fixed contact 1 is beta degrees when the moving contact 4 is switched on, the included angle between the central line of the soft connection 5 and the first fixed contact 1 is smaller than alpha degrees or smaller than beta degrees, the moving contact 4 and the soft connection 5 are on the same straight line at least at one moment in the switching on and switching off process, the soft connection 5 is bent into a certain angle in advance when being welded, and the bending quantity of the soft connection 5 can be reduced.

As shown in fig. 3, this embodiment is provided with two groups of moving contacts 4, each group of moving contacts 4 includes two clamping plates 41 that are oppositely arranged, and two conductive plates 42 that are arranged between the two clamping plates 41, the second stationary contact 2 is used for being inserted between the two conductive plates 42, an elastic sheet 43 is arranged at the outer side of one clamping plate 41, the elastic sheet 43 is used for driving the clamping plate 41 to push the conductive plates 42 to compress tightly with the second stationary contact 2, one end of the two conductive plates 42, which is close to the first stationary contact 1, is respectively provided with a third welding end 44 that extends to the outer side of the two clamping plates 41, and the flexible connection 5 is connected with the third welding end 44 of the conductive plate 42.

As shown in fig. 5, the number of flexible connections 5 is equal to the number of conductive plates 42 in this embodiment, and each conductive plate 42 is connected to the first stationary contact 1 through one flexible connection 5.

As shown in fig. 7, this embodiment includes eight flexible connections 5, each conductive plate 42 is connected with the first fixed contact 1 through two flexible connections 5, one end of each flexible connection 5 is welded with two opposite sides of the conductive plate 42, and one ends of the two flexible connections 5 far away from the conductive plate 42 are in contact with each other and are welded with the first fixed contact 1 respectively.

As shown in fig. 10, a partition board is arranged on the contact support 3, the partition board is inserted into a mounting hole of the contact support for mounting the moving contact 4, the partition board comprises a first partition part 81 and a second partition part 82, the first partition part 81 is arranged between the two conductive plates 42, the second partition part 82 is arranged between the flexible connection 5 connected with the two conductive plates 42, the second partition part 82 is arranged at one end of the first partition part 81 in a protruding mode, the conductive plates of the moving contact can be positioned through the partition board, the flexible conductors can be effectively positioned, and the degree of freedom of the flexible connection is limited.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (10)

1. The utility model provides a switch unit of isolator, includes casing and first stationary contact (1), second stationary contact (2) and contact support (3) that set up respectively in the casing, its characterized in that: the contact support (3) is rotatably arranged in the shell, the rotation center of the contact support (3) is arranged between the first fixed contact (1) and the second fixed contact (2), the moving contact (4) is arranged on the contact support (3), the moving contact (4) is connected with the first fixed contact (1) through the soft connection (5), the contact support (3) is used for driving the moving contact (4) to rotate with the rotation center of the contact support (3), the moving contact (4) is enabled to rotate and contact and separate from the second fixed contact (2), a welding surface (12) for welding with the soft connection (5) is arranged on the first fixed contact (1), and the plate surface of the first fixed contact (1) provided with the welding surface (12) is in an oblique angle with the welding surface (12).

2. The switching unit of an isolating switch according to claim 1, wherein: the central line of the flexible connection (5) and the first fixed contact (1) are arranged in an oblique angle.

3. The switching unit of an isolating switch according to claim 1, wherein: the utility model discloses a welding groove, including first stationary contact (1), welding groove (11)'s bottom is equipped with welding face (12), welding face (12) are the oblique angle setting with first stationary contact (1), flexible coupling (5) are equipped with the locating surface, when locating surface and welding face (12) contact, the central line of flexible coupling (5) with first stationary contact (1) central line is the oblique angle setting, the side arch of first stationary contact (1) is equipped with welding boss (13), welding groove (11) set up in welding boss (13).

4. The switching unit of an isolating switch according to claim 1, wherein: the flexible connection (5) comprises a first welding end (51) and a second welding end (52), and a connecting portion (53) connected between the first welding end (51) and the second welding end (52), wherein the first welding end (51) and the second welding end (52) are respectively used for being welded with the first fixed contact (1) and the moving contact (4), the connecting portion (53) comprises a first side (54) and a second side (55) which are oppositely arranged at two sides of a central line, and the first side (54) and the second side (55) are respectively arranged at an oblique angle with the first fixed contact (1).

5. The switching unit of an isolating switch according to claim 1, wherein: the included angle between the moving contact (4) and the first fixed contact (1) is alpha degrees when the switch is opened, the included angle between the moving contact (4) and the first fixed contact (1) is beta degrees when the switch is closed, and the included angle between the central line of the soft connection (5) and the first fixed contact (1) is smaller than alpha degrees or smaller than beta degrees.

6. Switching unit of an disconnector according to any of claims 1-5, characterized in that: the movable contact (4) comprises two clamping plates (41) which are oppositely arranged, and two conducting plates (42) which are arranged between the two clamping plates (41), the second fixed contact (2) is used for being inserted between the two conducting plates (42), an elastic sheet (43) is arranged on the outer side of at least one clamping plate (41), and the elastic sheet (43) is used for driving the clamping plates (41) to push the conducting plates (42) to be pressed with the second fixed contact (2).

7. The switching unit of an isolating switch of claim 6, wherein: be equipped with the baffle on contact support (3), the baffle includes first isolation part (81) and second isolation part (82), first isolation part (81) set up between two current-conducting plates (42), second isolation part (82) set up between soft connection (5) that link to each other with two current-conducting plates (42), and second isolation part (82) protrusion sets up in first isolation part (81) one end.

8. Switching unit of an disconnector according to any of claims 1-5, characterized in that: the side of the first fixed contact (1) is provided with a radiator (7), and the radiator (7) comprises a contact plate used for being contacted with the first fixed contact (1) and a plurality of radiating fins respectively connected with the contact plate.

9. Switching unit of an disconnector according to any of claims 1-5, characterized in that: the first fixed contact (1), the second fixed contact (2) extend out of the wiring part outside the shell, and the rotation axes of the moving contact (4) are positioned on the same plane.

10. An isolating switch, characterized in that: the device comprises an operation unit (A) and a plurality of switch units (B) as claimed in any one of claims 1 to 9, wherein the switch units (B) are stacked, the operation unit (A) is used for driving a contact support (3) in the switch units (B) to rotate, and the contact supports (3) of two adjacent switch units (B) are connected.