A pull-out switch cabinet

Abstract

This invention belongs to the field of power distribution equipment technology, specifically disclosing a pull-out switchgear, including a cabinet and drawer units. The cabinet has multiple mounting slots, each capable of housing one drawer unit. Each drawer unit is equipped with a state-switching handwheel. A rotatable and axially movable intermediate rod is used, and the movement of the intermediate rod is controlled by operating the state-switching handwheel during the insertion and removal of sector-shaped plugs. The arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost part of the conductive slot, the intermediate rod moves along the axis, causing the arc-shaped conductor to move and approach the built-in conductor, thus making contact. This avoids frequent relative displacement between the arc-shaped and built-in conductors caused by frequent insertion and removal operations, greatly reducing wear on the conductor contact surfaces, lowering maintenance costs, and improving power system stability.

Description

Technical Field

[0001] This invention belongs to the field of power distribution equipment technology, and specifically relates to a pull-out switch cabinet. Background Art

[0002] Pull-out switchgear, as a key switching device in power systems, is widely used in the power industry due to its ease of installation, maintenance, and replacement. During the switching of the connection status between the main circuit and secondary circuit, the pull-out switchgear requires rotating a state-switching handwheel to control the removal or insertion of plug-in components, thereby switching between the working state and the isolation state. While this design meets basic operational requirements, it has certain technical shortcomings.

[0003] Frequent plugging and unplugging operations cause frequent relative displacement between the plug and socket, leading to wear on the conductors. This not only reduces the stability and lifespan of the equipment but may also increase contact resistance, resulting in poor contact and overheating. The friction process may even generate metal dust and electric sparks. These problems not only affect the stable operation of the switchgear but may also cause safety accidents. Furthermore, conductor wear increases maintenance costs, requiring periodic replacement, which necessitates downtime and disrupts the continuous power supply to the power system. Summary of the Invention

[0004] To address the aforementioned shortcomings, the present invention aims to provide a pull-out switchgear that features a rotatable and axially movable intermediate rod. The movement of the intermediate rod is controlled by an operation state switching handwheel. During the insertion and removal of the sector-shaped plug, the arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost part of the conductive slot, the intermediate rod moves along the axis, causing the arc-shaped conductor to move and approach the built-in conductor, thus making contact. This avoids frequent relative displacement between the arc-shaped and built-in conductors caused by frequent insertion and removal operations, significantly reducing wear on the conductor contact surfaces, lowering maintenance costs, and improving power system stability.

[0005] To achieve the above objectives, this invention provides a pull-out switch cabinet, including a cabinet body and drawer units. The cabinet body has multiple mounting slots, each capable of housing one drawer unit. Each drawer unit is equipped with a state-switching handwheel. A central rod is mounted on each drawer unit, horizontally extending through the entire unit. The central rod is rotatable and axially movable. A state-switching handwheel is mounted at the front end of the central rod, and a fan-shaped insert is mounted at the rear. A fan-shaped socket is located within each mounting slot, coaxial with the central rod. An arc-shaped conductor is mounted on the fan-shaped insert, and a conductive groove is mounted on the fan-shaped socket. By rotating the central rod, the arc-shaped conductor can be inserted into or removed from the conductive groove. An internal conductor is located within the conductive groove. When the fan-shaped insert rotates, the arc-shaped conductor and the internal conductor do not contact each other. When the arc-shaped conductor is inserted to the innermost end of the conductive groove, the central rod is moved along the axis, causing the arc-shaped conductor to move and approach the internal conductor, thus making contact with it.

[0006] Furthermore, the sector-shaped plug-in includes a main circuit plug-in and a secondary circuit plug-in, with corresponding conductive grooves for the main circuit and secondary circuit on the sector-shaped socket. The secondary circuit plug-in is closer to the sector-shaped socket than the main circuit plug-in, thus achieving electrical connection with the sector-shaped socket earlier during insertion. The secondary circuit plug-in can rotate around the axis of the central rod. A first spring is provided between the secondary circuit plug-in and the central rod. The first spring causes the secondary circuit plug-in to be positioned closer to the sector-shaped socket at an angle, and by compressing the first spring, the secondary circuit plug-in can rotate to the same angle position as the main circuit plug-in.

[0007] Furthermore, the built-in conductor is elastic. A second spring is provided between the middle rod and the drawer unit body. The second spring tends to push the middle rod axially to one side, which is designated as the reset side, and the opposite side as the repetitive position side. A protrusion is provided on the side of the rear end of the middle rod. A cylindrical groove is formed on the inner end face of the mounting groove. When the drawer unit is installed in the mounting groove, the rear end of the middle rod is located in the cylindrical groove and the two are coaxial. A straight groove is formed on the inner side wall of the cylindrical groove to cooperate with the protrusion. The straight groove is parallel to the axis. The rear end of the straight groove is connected to a state switching groove. The state switching groove extends circumferentially, and the extension direction is the same as the rotation direction when the fan-shaped plug is inserted. A first inclined surface, a second inclined surface, and a slot are provided sequentially along the extension direction. The first inclined surface is inclined towards the repetitive position side. The entire second inclined surface has a drop relative to the end point of the first inclined surface towards the reset side. The second inclined surface is also inclined towards the repetitive position side. The slot has a drop relative to the end point of the second inclined surface towards the reset side. When the protrusion is at the starting point of the first inclined plane, the sector plug and the sector socket are not connected. When the protrusion moves inward along the first inclined plane, the secondary circuit plug gradually inserts into the secondary circuit conductive groove, and the arc-shaped conductor of the secondary circuit plug does not contact the built-in conductor of the secondary circuit conductive groove. When the protrusion is on the second inclined plane, the intermediate rod drives the sector plug to move towards the reset side, causing the arc-shaped conductor of the secondary circuit plug to approach and contact the built-in conductor of the secondary circuit conductive groove. When the protrusion moves inward along the second inclined plane, the main circuit plug gradually inserts into the main circuit conductive groove, and the arc-shaped conductor of the main circuit plug does not contact the built-in conductor of the main circuit conductive groove. When the protrusion is in the slot, the intermediate rod drives the sector plug to move towards the reset side, causing the arc-shaped conductor of the main circuit plug to approach and contact the built-in conductor of the main circuit conductive groove.

[0008] Furthermore, a wire pass-through port is provided on the side of the middle rod, through which the wires of the components in the drawer unit can pass to establish an electrical connection with the fan-shaped plug.

[0009] Furthermore, it also includes a purging assembly. The purging assembly includes a one-way exhaust pipe and a cooperating air chamber and piston. The piston is in sealed sliding contact with the inner wall of the air chamber, and the movement of the piston changes the effective volume of the air chamber. The inlet end of the one-way exhaust pipe is connected to the air chamber. When the drawer unit is installed in the mounting slot, the outlet end of the one-way exhaust pipe is directly opposite the purging hole opened on the fan-shaped socket. The purging hole is connected to the inner end of each conductive slot.

[0010] Furthermore, the purging assembly also includes a one-way air intake filter, which allows outside air to enter the air chamber after being filtered.

[0011] Furthermore, a push rod is fixed inside the mounting slot. When the drawer unit is installed in the mounting slot from the outside in, the push rod pushes the piston to move, causing the effective volume of the air chamber to decrease. An elastic component is provided between the air chamber and the piston, and the elastic component tends to cause the piston to move in the direction that increases the effective volume of the air chamber.

[0012] Furthermore, the air chamber is arc-shaped, and a pushing structure is fixed on the intermediate rod. When the intermediate rod is rotated to a specific angle, the pushing structure can push the piston to slide within the air chamber.

[0013] Furthermore, there are two sets of purging components. There are two purging holes: a main circuit purging hole connecting each main circuit conductive slot, and a secondary circuit purging hole connecting each secondary circuit conductive slot. The outlets of the unidirectional exhaust pipes of the two purging components are aligned with the main circuit purging hole and the secondary circuit purging hole, respectively. When the main circuit plug is inserted, the corresponding purging component purifies the main circuit conductive slot; when the secondary circuit plug is inserted, the corresponding purging component purifies the secondary circuit conductive slot.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects:

[0015] 1. This invention utilizes a rotatable and axially movable intermediate rod, controlled by a handwheel that switches operation states. During the insertion and removal of the sector-shaped plug, the arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost part of the conductive groove, the intermediate rod moves along the axis, causing the arc-shaped conductor to move and approach the built-in conductor, thus making contact. This avoids frequent relative displacement between the arc-shaped and built-in conductors caused by frequent insertion and removal operations, greatly reducing wear on the conductor contact surface, lowering maintenance costs, and improving the stability of the power system.

[0016] 2. This invention utilizes the cooperation of a state switching groove and a protrusion. Rotating the state switching handwheel allows switching between different connectivity states. When disconnecting a circuit, the state switching handwheel must be pressed inward while rotating to prevent accidental circuit disconnection. This process coordinates with the actions of the main circuit plug-in, secondary circuit plug-in, main circuit conductive groove, and secondary circuit conductive groove, easily completing the connectivity state switching while avoiding friction between the arc-shaped conductor and the built-in conductor.

[0017] 3. In Embodiment 2 of the present invention, the installation action of the drawer unit pushes the piston to compress the air chamber, blowing clean air from the chamber into the purging hole. This purifies each conductive groove, removing any floating dust, solid particles, or other impurities that may be present in the groove. This prevents impurities from damaging the conductors, providing better protection for the curved and internal conductors, and enhancing the stability of the electrical connection. Simultaneously, the push rod's action of pushing the piston to compress the spring and air creates a damping effect before the drawer unit is fully installed, preventing damage from forceful installation and adding a touch of sophistication.

[0018] 4. In Embodiment 3 of the present invention, the action of rotating the state switching handwheel when the circuit is connected is used to trigger the purging action. Furthermore, the purging assembly is set into two sets. The purging action of each set of purging assemblies is performed simultaneously with the insertion action of the corresponding plug and conductive groove. In this way, air can only be discharged through the gap between the arc conductor and the conductive groove, thereby reducing the flow area, increasing the air velocity, and thus enhancing the purging effect. Moreover, while purging the conductive groove, the arc conductor can also be purged. Attached Figure Description

[0019] Figure 1 This is a perspective view of the pull-out switch cabinet of the present invention;

[0020] Figure 2 This is a perspective view of the cabinet of the present invention;

[0021] Figure 3 This is an anatomical diagram of the cabinet of the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is the first perspective view of the drawer unit of the present invention;

[0024] Figure 6 This is a second perspective view of the drawer unit of the present invention;

[0025] Figure 7 This is the third perspective view of the drawer unit of the present invention;

[0026] Figure 8 This is an anatomical diagram of the drawer unit of the present invention;

[0027] Figure 9 This is another disassembled view of the drawer unit of the present invention;

[0028] Figure 10 This is an anatomical diagram of the intermediate rod of the present invention;

[0029] Figure 11 This is a perspective view of the sector-shaped socket of the present invention;

[0030] Figure 12 For the present invention Figure 4 A three-dimensional view of the internal structure of the mounting slot;

[0031] Figure 13 For the present invention Figure 4 Another 3D view of the internal structure of the mounting slot;

[0032] Figure 14 This is an exploded view of the air chamber in Embodiment 2 of the present invention;

[0033] Figure 15 This is a schematic diagram showing the state of the insertion and removal process of the conductive groove and the arc-shaped conductor in this invention;

[0034] Figure 16 This is a schematic diagram showing the state when the conductive groove of the present invention is electrically connected to the arc-shaped conductor;

[0035] Figure 17 This is a perspective view of the internal structure of the drawer unit in Embodiment 3 of the present invention;

[0036] Figure 18 This is another perspective view of the internal structure of the drawer unit in Embodiment 3 of the present invention;

[0037] Figure 19 This is an anatomical diagram of the internal structure of the drawer unit in Embodiment 3 of the present invention.

[0038] In the diagram: 100 - Cabinet body, 110 - Fan-shaped socket, 111 - Conductive groove, 111a - Main circuit conductive groove, 111b - Secondary circuit conductive groove, 112 - Purge hole, 112a - Main circuit purge hole, 112b - Secondary circuit purge hole, 113 - Built-in conductor, 120 - Cylindrical groove, 130 - Straight groove, 140 - State switching groove, 141 - First inclined surface, 142 - Second inclined surface, 143 - Slot, 150 - Push rod, 200 - Drawer single 210-State switching handwheel, 220-Intermediate rod, 221-Protrusion, 222-Wire threading port, 223-Push structure, 230-Fan-shaped plug, 230a-Main circuit plug, 230b-Secondary circuit plug, 231-Arc-shaped conductor, 240-First spring, 250-Second spring, 310-One-way air outlet pipe, 320-Air chamber, 321-Air chamber outlet, 330-Piston, 340-One-way air inlet filter, 350-Elastic component. Detailed Implementation

[0039] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0040] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms “set up”, “connected”, and “linked” should be interpreted broadly.

[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] Reference Figures 1 to 16 This embodiment discloses a pull-out switch cabinet, including a cabinet body and drawer units. The cabinet body has multiple mounting slots, each capable of housing one drawer unit. Each drawer unit has a state-switching handwheel. A central rod is mounted on each drawer unit, horizontally extending through the entire unit. The central rod is rotatable and axially movable. The central rod has a state-switching handwheel at its front end and a fan-shaped insert at its rear. A fan-shaped socket is located within each mounting slot, coaxial with the central rod. An arc-shaped conductor is mounted on the fan-shaped insert, and a conductive groove is mounted on the fan-shaped socket. By rotating the central rod, the arc-shaped conductor can be inserted into or removed from the conductive groove. An internal conductor is located within the conductive groove. When the fan-shaped insert rotates, the arc-shaped conductor and the internal conductor do not contact each other. When the arc-shaped conductor is inserted to the innermost part of the conductive groove, the central rod moves along its axis, causing the arc-shaped conductor to move and approach the internal conductor, thus making contact with it.

[0044] This embodiment uses a rotatable and axially movable intermediate rod, controlled by a handwheel that switches operation states during the insertion and removal of the sector-shaped plug. The arc-shaped conductor and the built-in conductor do not contact each other. When the arc-shaped conductor is inserted into the innermost part of the conductive groove, the intermediate rod moves along the axis, causing the arc-shaped conductor to move and approach the built-in conductor, thus making contact. This avoids frequent relative displacement between the arc-shaped and built-in conductors caused by frequent insertion and removal operations, greatly reducing wear on the conductor contact surface, lowering maintenance costs, and improving power system stability.

[0045] As a further embodiment, the sector-shaped plug-in includes a main circuit plug-in and a secondary circuit plug-in. The sector-shaped socket is respectively provided with a main circuit conductive groove and a secondary circuit conductive groove. The secondary circuit plug-in is closer to the sector-shaped socket than the main circuit plug-in, thus achieving electrical connection with the sector-shaped socket earlier during insertion. The secondary circuit plug-in can rotate around the axis of the intermediate rod. A first spring is provided between the secondary circuit plug-in and the intermediate rod. The first spring causes the secondary circuit plug-in to be positioned closer to the sector-shaped socket at an angle, and by compressing the first spring, the secondary circuit plug-in can rotate to the same angle position as the main circuit plug-in. Using the above technical solution, only the secondary circuit can be connected for debugging, or both the main circuit and the secondary circuit can be connected simultaneously.

[0046] As a further aspect of this embodiment, the built-in conductor is elastic. A second spring is provided between the intermediate rod and the drawer unit body. The second spring tends to push the intermediate rod axially to one side, which is designated as the reset side, and the opposite side as the repetitive position side. A protrusion is provided on the side of the rear end of the intermediate rod. A cylindrical groove is formed on the inner end face of the mounting groove. When the drawer unit is installed in the mounting groove, the rear end of the intermediate rod is located in the cylindrical groove and the two are coaxial. A straight groove is formed on the inner side wall of the cylindrical groove to cooperate with the protrusion. The straight groove is parallel to the axis. The rear end of the straight groove is connected to a state switching groove. The state switching groove extends circumferentially, and the extension direction is the same as the rotation direction when the fan-shaped plug is inserted. A first inclined surface, a second inclined surface, and a slot are provided sequentially along the extension direction. The first inclined surface is inclined towards the repetitive position side. The entire second inclined surface has a drop relative to the end point of the first inclined surface towards the reset side. The second inclined surface is also inclined towards the repetitive position side. The slot has a drop relative to the end point of the second inclined surface towards the reset side. When the protrusion is at the starting point of the first inclined plane, the sector plug and sector socket are not connected. When the protrusion moves inward along the first inclined plane, the secondary circuit plug gradually inserts into the secondary circuit conductive groove, and the arc-shaped conductor of the secondary circuit plug does not contact the built-in conductor of the secondary circuit conductive groove. When the protrusion is on the second inclined plane, the intermediate rod drives the sector plug to move towards the reset side, causing the arc-shaped conductor of the secondary circuit plug to approach and contact the built-in conductor of the secondary circuit conductive groove. When the protrusion moves inward along the second inclined plane, the main circuit plug gradually inserts into the main circuit conductive groove, and the arc-shaped conductor of the main circuit plug does not contact the built-in conductor of the main circuit conductive groove. When the protrusion is in the slot, the intermediate rod drives the sector plug to move towards the reset side, causing the arc-shaped conductor of the main circuit plug to approach and contact the built-in conductor of the main circuit conductive groove. Through the above technical solution, by utilizing the cooperation of the state switching groove and the protrusion, rotating the state switching handwheel can switch between different connection states. When disconnecting the circuit, it is necessary to press the state switching handwheel inward while rotating it to prevent accidental circuit disconnection. The above process is coordinated with the actions of the main circuit plug-in, secondary circuit plug-in, main circuit conductive groove and secondary circuit conductive groove, which can easily complete the switching of the connected state while avoiding friction between the arc-shaped conductor and the built-in conductor.

[0047] As a further embodiment, a wire-passing port is provided on the side of the middle rod, and the wires of the components in the drawer unit can pass through the wire-passing port to establish an electrical connection with the fan-shaped plug.

[0048] Example 2

[0049] This embodiment, based on Embodiment 1, further includes a purging assembly. (Refer to...) Figures 4 to 14The purging assembly includes a one-way exhaust pipe, a cooperating air chamber, and a piston. The piston is in sealed sliding contact with the inner wall of the air chamber, and the movement of the piston changes the effective volume of the air chamber. The inlet end of the one-way exhaust pipe is connected to the air chamber. When the drawer unit is installed in the mounting slot, the outlet end of the one-way exhaust pipe is directly opposite the purging hole on the fan-shaped socket, and the purging hole is connected to the inner end of each conductive slot.

[0050] Furthermore, the purging assembly also includes a one-way air intake filter, which allows outside air to enter the air chamber after being filtered.

[0051] Furthermore, a push rod is fixed inside the mounting slot. When the drawer unit is installed in the mounting slot from the outside in, the push rod pushes the piston to move, causing the effective volume of the air chamber to decrease. An elastic component is provided between the air chamber and the piston, and the elastic component tends to cause the piston to move in the direction that increases the effective volume of the air chamber.

[0052] This embodiment incorporates a purging assembly. The installation action of the drawer unit pushes a piston to compress the air chamber, blowing clean air from the chamber into the purging holes. This purifies the conductive grooves, removing any floating dust, solid particles, or other impurities that may be present. This prevents impurities from damaging the conductors, providing better protection for curved and internal conductors, and enhancing the stability of the electrical connection. Simultaneously, the push rod's action of pushing the piston to compress the spring and air creates a damping effect before the drawer unit is fully installed, preventing damage from forceful installation and adding a touch of sophistication.

[0053] Example 3

[0054] This embodiment, based on Embodiment 1, also includes a purging assembly. (Refer to...) Figures 17 to 19 The difference between this embodiment and Embodiment 2 is that the air chamber is arc-shaped, and a pushing structure is fixed on the intermediate rod. When the intermediate rod is rotated to a specific angle, the pushing structure can push the piston to slide within the air chamber. Of course, in general, this embodiment should also be equipped with a corresponding structure to realize the piston's return stroke. A spring can be used, or the piston can be driven to return by the reverse rotation of the intermediate rod when the circuit is broken. Those skilled in the art can design it arbitrarily.

[0055] Furthermore, there are two sets of purging components. There are two purging holes, including a main circuit purging hole connecting each main circuit conductive groove and a secondary circuit purging hole connecting each secondary circuit conductive groove. The outlets of the unidirectional air outlets of the two sets of purging components are respectively aligned with the main circuit purging hole and the secondary circuit purging hole. When the main circuit plug is inserted, the corresponding purging component purifies the main circuit conductive groove; when the secondary circuit plug is inserted, the corresponding purging component purifies the secondary circuit conductive groove. Specifically, in this embodiment, the two sets of air chambers are located within the same annular base, and two air chamber outlets are respectively provided on the annular base for connecting the unidirectional air outlet pipes. The specific pipe layout of the unidirectional air outlet pipes can be flexibly designed by those skilled in the art based on the specific layout within the drawer unit; this embodiment does not provide a specific example.

[0056] In this embodiment, the action of rotating the state switching handwheel when the circuit is connected is used to trigger the purging action. Furthermore, the purging assembly is set up as two sets. The purging action of each set of purging assemblies is performed simultaneously with the insertion action of the corresponding plug and conductive groove. In this way, air can only be discharged through the gap between the arc conductor and the conductive groove, thereby reducing the flow area, increasing the air velocity, and thus enhancing the purging effect. Moreover, the arc conductor can also be purged while the conductive groove is being purged.

[0057] The structure of Embodiment 2 is relatively simple and can produce a damping effect, while the structure of Embodiment 3 is relatively complex, but it can enhance the purging effect and can also purge the arc-shaped conductor while purging the conductive groove. Those skilled in the art can make a reasonable choice according to their needs.

[0058] The above description only details the preferred embodiments of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pull-out switch cabinet, comprising a cabinet body (100) and drawer units (200), wherein the cabinet body (100) is provided with a plurality of mounting slots, each mounting slot being capable of installing one drawer unit (200), and the drawer unit (200) is provided with a state switching handwheel (210), characterized in that: A central rod (220) is installed on the drawer unit (200). The central rod (220) runs horizontally through the entire drawer unit (200). The central rod (220) can rotate along the axis and move back and forth along the axis. A state switching handwheel (210) is installed at the front end of the central rod (220), and a fan-shaped insert (230) is provided at the rear. A fan-shaped socket (110) is provided in the mounting slot. Both the fan-shaped insert (230) and the fan-shaped socket (110) are coaxial with the central rod (220). An arc-shaped conductor (231) is provided on the fan-shaped insert (230), and a conductor is provided on the fan-shaped socket (110). The conductive groove (111) allows the arc-shaped conductor (231) to be inserted into or removed from the conductive groove (111) by rotating the intermediate rod (220). The conductive groove (111) is equipped with a built-in conductor (113). When the fan-shaped plug (230) rotates, the arc-shaped conductor (231) and the built-in conductor (113) do not contact each other. When the arc-shaped conductor (231) is inserted into the innermost part of the conductive groove (111), the intermediate rod (220) is moved by the axis, and the arc-shaped conductor (231) moves with the intermediate rod (220) and approaches the built-in conductor (113), thus coming into contact with the built-in conductor (113).

2. The pull-out switchgear according to claim 1, characterized in that: The sector plug (230) includes a main circuit plug (230a) and a secondary circuit plug (230b). The sector socket (110) is provided with a main circuit conductive groove (111a) and a secondary circuit conductive groove (111b) respectively. The secondary circuit plug (230b) is closer to the sector socket (110) than the main circuit plug (230a), so that it can complete the electrical connection with the sector socket (110) earlier during plugging. The secondary circuit plug (230b) can rotate around the axis of the intermediate rod (220). A first spring (240) is provided between the secondary circuit plug (230b) and the intermediate rod (220). The first spring (240) causes the secondary circuit plug (230b) to be located at an angle position closer to the sector socket (110). By squeezing the first spring (240), the secondary circuit plug (230b) can rotate to the same angle position as the main circuit plug (230a).

3. The pull-out switch cabinet according to claim 2, characterized in that: The built-in conductor (113) is elastic; a second spring (250) is provided between the intermediate rod (220) and the main body of the drawer unit (200). The second spring (250) tends to push the intermediate rod (220) to one side along the axial direction. Let this side be the reset side and the opposite side be the repetitive position side. A protrusion (221) is provided on the side of the rear end of the intermediate rod (220). A cylindrical groove (120) is opened on the inner end face of the mounting groove. When the drawer unit (200) is installed in the mounting groove, the rear end of the intermediate rod (220) is located in the cylindrical groove (120) and the two are coaxial. A straight groove (130) is opened on the inner side wall of the cylindrical groove (120) to cooperate with the protrusion (221). Parallel to the axis; the rear end of the straight groove (130) is connected to the state switching groove (140); the state switching groove (140) extends circumferentially, and the extension direction is the same as the rotation direction when the fan-shaped plug (230) is inserted, and a first inclined surface (141), a second inclined surface (142) and a slot (143) are arranged sequentially along the extension direction; the first inclined surface (141) is inclined towards the repeated position side, and the entire second inclined surface (142) has a drop relative to the end point of the first inclined surface (141) towards the reset side, the second inclined surface (142) is also inclined towards the repeated position side, and the slot (143) has a drop relative to the end point of the second inclined surface (142) towards the reset side; when the protrusion (221) is located on the first inclined surface (141) 41) At the starting point, the sector plug (230) and sector socket (110) are not plugged in; when the protrusion (221) moves inward along the first inclined surface (141), the secondary circuit plug (230b) gradually inserts into the secondary circuit conductive groove (111b), and the arc-shaped conductor (231) of the secondary circuit plug (230b) does not contact the built-in conductor (113) of the secondary circuit conductive groove (111b); when the protrusion (221) is located on the second inclined surface (142), the intermediate rod (220) drives the sector plug (230) to move together towards the reset side, so that the arc-shaped conductor (231) of the secondary circuit plug (230b) approaches the secondary circuit conductive groove (111b). b) The built-in conductor (113) makes contact; when the protrusion (221) moves inward along the second inclined surface (142), the main circuit plug (230a) gradually inserts into the main circuit conductive groove (111a), and the arc-shaped conductor (231) of the main circuit plug (230a) does not contact the built-in conductor (113) of the main circuit conductive groove (111a); when the protrusion (221) is located in the slot (143), the intermediate rod (220) drives the fan-shaped plug (230) to move together to the reset side, so that the arc-shaped conductor (231) of the main circuit plug (230a) approaches the built-in conductor (113) of the main circuit conductive groove (111a) and makes contact.

4. The pull-out switchgear according to claim 1, characterized in that: The side of the middle rod (220) is provided with a wire hole (222), and the wires of the components in the drawer unit (200) can pass through the wire hole (222) to establish an electrical connection with the fan-shaped plug (230).

5. The pull-out switchgear according to claim 2, characterized in that: It also includes a purging assembly; the purging assembly includes a one-way air outlet pipe (310) and a cooperating air chamber (320) and piston (330), the piston (330) and the inner wall of the air chamber (320) are in sealed sliding contact, the piston (330) moves to change the effective volume in the air chamber (320); the inlet end of the one-way air outlet pipe (310) is connected to the air chamber (320), and when the drawer unit (200) is installed in the mounting slot, the outlet end of the one-way air outlet pipe (310) is directly opposite the purging hole (112) opened on the fan-shaped socket (110), the purging hole (112) is connected to the inner end of each conductive groove (111).

6. The pull-out switchgear according to claim 5, characterized in that: The purging assembly also includes a one-way air intake filter (340), which allows outside air to enter the air chamber (320) after being filtered.

7. The pull-out switch cabinet according to claim 5, characterized in that: A push rod (150) is fixed in the mounting slot. When the drawer unit (200) is installed in the mounting slot from the outside to the inside, the push rod (150) pushes the piston (330) to move, which reduces the effective volume of the air chamber (320). An elastic member (350) is provided between the air chamber (320) and the piston (330). The elastic member (350) tends to cause the piston (330) to move in the direction of increasing the effective volume of the air chamber (320).

8. The pull-out switchgear according to claim 5, characterized in that: The air chamber (320) is arc-shaped, and a push structure (223) is fixed on the intermediate rod (220). When the intermediate rod (220) is rotated to a specific angle, the push structure (223) can push the piston (330) to slide in the air chamber (320).

9. The pull-out switch cabinet according to claim 8, characterized in that: There are two sets of purging components; there are two purging holes (112), including a main circuit purging hole (112a) connecting each main circuit conductive groove (111a) and a secondary circuit purging hole (112b) connecting each secondary circuit conductive groove (111b); the outlets of the one-way air outlet pipes (310) of the two sets of purging components are respectively aligned with the main circuit purging hole (112a) and the secondary circuit purging hole (112b); when the main circuit plug-in (230a) is inserted, the corresponding purging component purifies the main circuit conductive groove (111a); when the secondary circuit plug-in (230b) is inserted, the corresponding purging component purifies the secondary circuit conductive groove (111b).

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