A cable chamber door interlocking device for an air- insulated switchgear and the air-insulated switchgear

Abstract

The application relates to the technical field of switch equipment, in particular to a cable chamber door interlocking device for an air-filled cabinet and the air-filled cabinet. The cable chamber door interlocking device for the air-filled cabinet comprises a locking rod, and an elastic element is arranged between the locking rod and a cabinet body; the device further comprises an interlocking assembly, the interlocking assembly is provided with an interlocking pushing part for pushing the locking rod to move downwards, a lock hook is rotatably arranged on the interlocking assembly, a lock block is fixedly arranged on a cable chamber door, the lock block is provided with a lock block pushing part for pushing the interlocking assembly to move forward, a pushing structure is arranged in the cable chamber and used for pushing the lock hook to rotate to be locked with the lock block; the device further comprises an interlocking rod, a jack is arranged on the interlocking assembly and used for inserting the interlocking rod to lock the interlocking assembly; an elastic element is arranged between the interlocking rod and the cabinet body and used for driving the interlocking rod to move upwards; and an elastic element is arranged between the interlocking assembly and the cable chamber and used for driving the interlocking assembly to move backwards. The cable chamber door interlocking device can realize mutual locking of the cable chamber door and a switch mechanism, and the safety protection performance is improved.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and in particular to a cable compartment door interlocking device for a gas-insulated switchgear and a gas-insulated switchgear. Background Technology

[0002] C-GIS gas-insulated switchgear is mainly used in power plants, power distribution in substations of power transmission and transformation systems, and power distribution in industrial and mining enterprises. It is an important complete set of switchgear for 10-35kV power systems. The cable compartment of the C-GIS gas-insulated switchgear is located at the rear of the cabinet, and the switch mechanism compartment is located at the front. The cable compartment door is the entry point for maintenance personnel to enter the cabinet for maintenance work. To ensure the safety of maintenance personnel, the cable compartment door and the switch mechanism must be equipped with a safe and reliable mechanical interlock to prevent misoperation. This interlock ensures that the cable compartment door can only be opened when the grounding switch is closed, and cannot be opened when the grounding switch is open. Furthermore, the grounding switch cannot be opened when the cable compartment door is open, and can only be opened when the cable compartment door is closed. Current technology typically installs an interlocking mechanism inside the cabinet, but this mechanism only ensures that the cable compartment door can be opened when the grounding switch is closed, and cannot guarantee that the grounding switch cannot be opened when the cable compartment door is open, thus providing poor safety protection. Summary of the Invention

[0003] The purpose of this invention is to provide a cable compartment door interlocking device for a gas-insulated switchgear, so as to solve the problem that the interlocking device in the existing gas-insulated switchgear cannot guarantee that the grounding switch cannot be tripped after the cable compartment door is opened, resulting in poor safety protection; the purpose of this invention is also to provide a gas-insulated switchgear, so as to solve the problem of poor safety protection of the existing gas-insulated switchgear.

[0004] The interlocking device for the cable compartment door of the gas-insulated switchgear of the present invention adopts the following technical solution: A cable compartment door interlocking device for a gas-insulated switchgear includes a locking rod movably mounted on the cabinet in a vertical direction. An elastic element is provided between the locking rod and the cabinet to drive the locking rod upward when the cable compartment door is opened, thereby locking the grounding switch trip plate and preventing the grounding switch from tripping. The device also includes an interlocking assembly movably mounted inside the cable compartment in a front-rear direction. The interlocking assembly has an interlocking push part that pushes the locking rod downward when the cable compartment door is closed, thereby releasing the locking of the grounding switch trip plate. A locking hook is rotatably mounted on the interlocking assembly, and a locking block is fixedly mounted on the cable compartment door. The locking block has a mechanism that pushes the interlocking assembly downward when the cable compartment door is closed. The interlocking assembly includes a locking block pusher that moves forward, causing the locking rod to move downward. The cable compartment has a pusher structure for rotating the locking hook to lock with the locking block when the interlocking assembly moves forward. It also includes an interlocking rod mounted vertically on the cabinet. The interlocking assembly has a socket for inserting the interlocking rod to lock the assembly when the drive shaft crank arm presses down. An interlocking rod elastic element is provided between the interlocking rod and the cabinet to drive the interlocking rod upward when the drive shaft crank arm is released from downward pressure, thus unlocking the interlocking assembly. An interlocking assembly elastic element is provided between the interlocking assembly and the cable compartment to drive the interlocking assembly backward when the cable compartment door is opened.

[0005] Furthermore, the center of gravity of the lock hook deviates from the rotation axis of the lock hook, and when the pushing structure separates from the lock hook, the lock hook rotates by its own weight to unlock the lock block.

[0006] Furthermore, the interlocking assembly includes an interlocking plate and a connecting rod, which are movably installed in the cable chamber in the front-rear direction. The front end of the connecting rod is fixedly connected to the interlocking plate, and the interlocking plate is provided with the interlocking push part. The locking hook is rotatably installed at the rear end of the connecting rod.

[0007] Furthermore, the cable compartment is provided with front and rear support plates spaced apart along the front-to-back direction. Each of the front and rear support plates is provided with a connecting rod through hole. The connecting rod is movably installed in the connecting rod through hole of the front and rear support plates and is circumferentially anti-rotationally engaged with the rear support plate.

[0008] Furthermore, the rear end of the connecting rod has a flat portion, and the connecting rod through hole on the rear support plate is a flat hole. The flat portion is inserted into the flat hole to achieve a circumferential anti-rotation fit between the connecting rod and the rear support plate.

[0009] Furthermore, the interlocking plate is provided with elongated holes extending forward and backward, and at least two limiting pins are movably installed in the elongated holes. Each limiting pin is fixedly connected to the top plate of the cable chamber, thereby allowing the interlocking plate to be movably installed in the cable chamber in the forward and backward direction and to fit the interlocking plate against the top plate of the cable chamber.

[0010] Furthermore, the interlocking plate includes a horizontal plate, a vertical plate connected to the rear side of the horizontal plate, and a slanted plate connected to the left side of the horizontal plate. The front end of the connecting rod is fixedly connected to the vertical plate. The front end of the slanted plate has a pushing surface that slopes downward from front to back. The pushing surface constitutes the interlocking pushing part. The locking rod has a pushing engagement structure for cooperating with the pushing surface.

[0011] Furthermore, the lower part of the locking rod has a long through groove that extends axially and passes radially through, into which the front end of the inclined plate can be inserted. A roller is rotatably installed in the long through groove, and the roller constitutes the push-fit structure. The inclined plate pushes the roller, thereby driving the locking rod to move downward.

[0012] Furthermore, the bottom of the interlocking rod is provided with a guiding structure for automatically guiding the interlocking rod when it is inserted into the socket of the interlocking assembly.

[0013] Beneficial effects: The cable compartment door interlocking device for gas-filled cabinets of the present invention is a pioneering invention. When the cable compartment door is open, the locking rod moves upward under the action of the elastic element to lock the grounding switch trip plate, preventing the grounding switch from tripping. When the cable compartment door is closed, the interlocking assembly moves forward under the push of the locking block fixed on the cable compartment door. The interlocking assembly pushes the locking rod downward to release the grounding switch trip plate, allowing the grounding switch to trip. At the same time, the locking hook on the interlocking assembly locks the locking block on the cable compartment door. When the grounding switch is open, the interlocking rod is inserted into the interlocking assembly under the downward pressure of the drive shaft crank arm, locking the interlocking assembly. The interlocking assembly cannot move, and the cable compartment door is also locked and cannot be opened. When it is necessary to open the cable compartment door, the grounding switch must be closed first, causing the switch mechanism drive shaft to rotate and release the downward pressure on the interlocking rod. The interlocking rod moves upward to unlock the interlocking assembly, which moves backward, causing the locking hook to rotate and unlock the locking block. At this time, the cable compartment door can be opened. This cable compartment door interlocking device ensures that the cable compartment door can only be opened when the grounding switch is closed, and the grounding switch cannot be opened after the cable compartment door is opened. The grounding switch can only be opened when the cable compartment door is closed, thereby improving safety protection.

[0014] The gas-filled cabinet of this invention adopts the following technical solution: The gas-insulated switchgear includes a cabinet, which houses a switch mechanism compartment and a cable compartment. A grounding switch trip plate and a drive shaft crank arm connected to the switch mechanism drive shaft are movably installed within the cabinet. A cable compartment door interlocking device is provided between the switch mechanism and the cable compartment door. The cable compartment door interlocking device includes a locking rod movably mounted on the cabinet in the vertical direction, with an elastic element between the locking rod and the cabinet that drives the locking rod upward when the cable compartment door is opened to lock the grounding switch trip plate and prevent the grounding switch from tripping. It also includes an interlocking assembly movably mounted inside the cable compartment in the front-rear direction. The interlocking assembly has an interlocking push part that pushes the locking rod downward when the cable compartment door is closed to release the locking of the grounding switch trip plate. A rotatable mounting plate is mounted on the interlocking assembly. The cable compartment is equipped with a locking hook and a locking block fixedly installed on the cable compartment door. The locking block has a locking block pushing part that pushes the interlocking assembly forward when the cable compartment door is closed, thereby causing the interlocking assembly to push the locking rod downward. The cable compartment is provided with a pushing structure for pushing the locking hook to rotate and lock with the locking block when the interlocking assembly moves forward. It also includes an interlocking rod that is movably installed on the cabinet in the vertical direction. The interlocking assembly is provided with a socket for the interlocking rod to be inserted and locked when the drive shaft crank arm presses down on the interlocking rod. There is an interlocking rod elastic element between the interlocking rod and the cabinet that drives the interlocking rod to move upward when the drive shaft crank arm is released from pressing down, thereby unlocking the interlocking assembly. There is an interlocking assembly elastic element between the interlocking assembly and the cable compartment that drives the interlocking assembly to move backward when the cable compartment door is opened.

[0015] Furthermore, the center of gravity of the lock hook deviates from the rotation axis of the lock hook, and when the pushing structure separates from the lock hook, the lock hook rotates by its own weight to unlock the lock block.

[0016] Furthermore, the interlocking assembly includes an interlocking plate and a connecting rod, which are movably installed in the cable chamber in the front-rear direction. The front end of the connecting rod is fixedly connected to the interlocking plate, and the interlocking plate is provided with the interlocking push part. The locking hook is rotatably installed at the rear end of the connecting rod.

[0017] Furthermore, the cable compartment is provided with front and rear support plates spaced apart along the front-to-back direction. Each of the front and rear support plates is provided with a connecting rod through hole. The connecting rod is movably installed in the connecting rod through hole of the front and rear support plates and is circumferentially anti-rotationally engaged with the rear support plate.

[0018] Furthermore, the rear end of the connecting rod has a flat portion, and the connecting rod through hole on the rear support plate is a flat hole. The flat portion is inserted into the flat hole to achieve a circumferential anti-rotation fit between the connecting rod and the rear support plate.

[0019] Furthermore, the interlocking plate is provided with elongated holes extending forward and backward, and at least two limiting pins are movably installed in the elongated holes. Each limiting pin is fixedly connected to the top plate of the cable chamber, thereby allowing the interlocking plate to be movably installed in the cable chamber in the forward and backward direction and to fit the interlocking plate against the top plate of the cable chamber.

[0020] Furthermore, the interlocking plate includes a horizontal plate, a vertical plate connected to the rear side of the horizontal plate, and a slanted plate connected to the left side of the horizontal plate. The front end of the connecting rod is fixedly connected to the vertical plate. The front end of the slanted plate has a pushing surface that slopes downward from front to back. The pushing surface constitutes the interlocking pushing part. The locking rod has a pushing engagement structure for cooperating with the pushing surface.

[0021] Furthermore, the lower part of the locking rod has a long through groove that extends axially and passes radially through, into which the front end of the inclined plate can be inserted. A roller is rotatably installed in the long through groove, and the roller constitutes the push-fit structure. The inclined plate pushes the roller, thereby driving the locking rod to move downward.

[0022] Furthermore, the bottom of the interlocking rod is provided with a guiding structure for automatically guiding the interlocking rod when it is inserted into the socket of the interlocking assembly.

[0023] Beneficial Effects: The gas-filled cabinet of this invention is an improved invention. When the cable compartment door is open, the locking rod moves upward under the action of the elastic element to lock the grounding switch trip plate, at which time the grounding switch cannot be tripped. When the cable compartment door is closed, the interlocking assembly moves forward under the push of the locking block fixed on the cable compartment door. The interlocking assembly pushes the locking rod downward to release the lock on the grounding switch trip plate, at which time the grounding switch can be tripped. At the same time, the locking hook on the interlocking assembly locks with the locking block on the cable compartment door. When the grounding switch is in the tripped state, the interlocking rod is inserted into the interlocking assembly under the downward pressure of the drive shaft crank arm to lock the interlocking assembly. The interlocking assembly cannot move, and the cable compartment door is also locked and cannot be opened. When it is necessary to open the cable compartment door, the grounding switch must be closed first, so that the drive shaft of the switch mechanism drives the drive shaft crank arm to rotate and release the downward pressure on the interlocking rod. The interlocking rod moves upward to unlock the interlocking assembly. The interlocking assembly moves backward, and the locking hook rotates to unlock the locking block. At this time, the cable compartment door can be opened. This cable compartment door interlocking device ensures that the cable compartment door can only be opened when the grounding switch is closed, and the grounding switch cannot be opened after the cable compartment door is opened. The grounding switch can only be opened when the cable compartment door is closed, thereby improving safety protection. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the cable compartment door closed in an embodiment of the gas-filled cabinet of the present invention; Figure 2 This is a bottom view of the cable compartment door when it is closed in an embodiment of the gas-filled cabinet of the present invention; Figure 3 This is a schematic diagram showing the cable compartment door open in an embodiment of the gas-filled cabinet of the present invention; Figure 4 This is a bottom view of the cable compartment door when it is open in an embodiment of the gas-filled cabinet of the present invention; Figure 5 This is a schematic diagram of the lock block structure; Figure 6 This is a schematic diagram of the locking hook structure; Figure 7 This is a schematic diagram of the connecting rod structure; Figure 8 This is a structural schematic diagram of the interlocking plate; Figure 9 This is a schematic diagram of the locking rod. Figure 10 This is a schematic diagram of the interlocking rod. In the diagram: 1. Lock block; 1-1. Lock groove; 1-2. Threaded hole; 1-3. Flat surface; 2. Lock hook; 2-1. Connecting arm; 2-2. Pin hole; 3. Connecting rod; 3-1. Small diameter threaded section; 3-2. Flat part; 3-3. Pin through hole; 3-4. Connecting rod through pin hole; 4. Connecting rod compression spring; 5. Interlocking plate; 5-1. Horizontal plate; 5-2. Vertical plate; 5-3. Slanted plate; 5-4. Long hole; 5-5. Insertion hole; 5-6. Vertical plate through hole; 5-7. Pushing surface; 6. Interlocking rod; 6-1. Interlocking rod through-hole; 6-2. Guide spherical surface; 7. Interlocking rod compression spring; 8. Locking rod; 8-1. Long through groove; 8-2. Locking rod through-hole; 9. Locking rod compression spring; 10. Roller; 11. Limiting pin; 12. Front support plate; 13. Rear support plate; 101. Cable compartment; 102. Cable compartment door; 103. Fixing frame; 104. Drive shaft crank arm; 105. Grounding switch tripping plate. Detailed Implementation

[0025] This invention primarily addresses the problem that existing interlocking devices in gas-insulated switchgear only allow the cable compartment door to open when the grounding switch is closed, failing to guarantee that the grounding switch cannot trip when the cable compartment door is open, resulting in poor safety protection. The basic inventive concept is as follows: by installing a locking rod, interlocking rod, and interlocking assembly within the switchgear, when the cable compartment door is open, the locking rod moves upward to lock the grounding switch trip plate, preventing the grounding switch from tripping; when the cable compartment door is closed, the locking rod moves downward to release the grounding switch trip plate, allowing the grounding switch to trip; when the grounding switch is tripped, the interlocking rod moves downward to lock the interlocking assembly, preventing the cable compartment door from opening; when the grounding switch is closed, the interlocking rod moves upward to unlock the interlocking assembly, allowing the interlocking assembly to move backward and the cable compartment door to open. This achieves mutual interlocking between the cable compartment door and the switch mechanism, improving safety protection.

[0026] Based on the above inventive concept, the embodiments of the present invention will be described in detail below.

[0027] Embodiments of the gas-filled cabinet of the present invention: like Figure 1-2As shown, the gas-insulated switchgear includes a cabinet, inside which are a switch mechanism compartment and a cable compartment 101. A grounding switch trip plate 105 and a drive shaft crank arm 104 are movably installed inside the cabinet. The drive shaft crank arm 104 is connected to the drive shaft of the switch mechanism. A cable compartment door 102 is located at the rear of the cable compartment 101. A cable compartment door interlocking device is provided between the cable compartment door 102 and the switch mechanism. The cable compartment door interlocking device includes a locking rod 8, an interlocking rod 6, and interlocking components. A fixed frame 103 is located above the cable compartment 101, and the fixed frame 103 is part of the cabinet. The locking rod 8 and the interlocking rod 6 are movably installed on the fixed frame 103 in the vertical direction. A locking rod elastic element, specifically a locking rod compression spring 9, is provided between the locking rod 8 and the fixing frame 103. The locking rod compression spring 9 is fitted onto the locking rod 8, with one end pressing against the fixing frame 103 and the other end pressing against the locking rod 8. When the interlocking assembly pushes the locking rod 8 downwards, the locking rod compression spring 9 is compressed and stores energy, releasing the locking rod 8 from locking the grounding switch trip plate 105, allowing the grounding switch to trip. When the interlocking assembly releases its push on the locking rod 8, the locking rod compression spring 9 releases its stored energy, causing the locking rod 8 to move upwards to lock the grounding switch trip plate 105, preventing the grounding switch from tripping. The use of a compression spring for the locking rod elastic element facilitates assembly. Of course, in other embodiments, a tension spring can also be used.

[0028] An interlocking rod elastic element, specifically an interlocking rod compression spring 7, is provided between the interlocking rod 6 and the fixing frame 103. The compression spring 7 is fitted onto the interlocking rod 6, with one end pressing against the fixing frame 103 and the other end pressing against the interlocking rod 6. When the drive shaft crank arm 104 rotates counterclockwise to press down on the interlocking rod 6, the compression spring 7 is compressed and stores energy, causing the lower end of the interlocking rod 6 to insert into the interlocking assembly and lock the assembly, preventing it from moving. When the drive shaft crank arm 104 rotates clockwise to release the pressure, the compression spring 7 releases its stored energy, driving the interlocking rod 6 upward and unlocking the interlocking assembly, allowing it to move. The use of a compression spring for the interlocking rod elastic element facilitates assembly. Of course, in other embodiments, a tension spring can also be used.

[0029] The interlocking assembly is movably installed in the cable chamber 101 along the front-to-back direction. The interlocking assembly includes an interlocking plate 5 and a connecting rod 3. The interlocking plate 5 and the connecting rod 3 are movably installed in the cable chamber 101 along the front-to-back direction, and the front end of the connecting rod 3 is fixedly connected to the interlocking plate 5. A front support plate 12 and a rear support plate 13 are provided at intervals along the front-to-back direction in the cable chamber 101. Both the front and rear support plates are fixedly connected to the top plate of the cable chamber. The front and rear support plates are respectively provided with connecting rod through holes. The connecting rod 3 is movably installed in the connecting rod through holes of the front and rear support plates and is circumferentially anti-rotating with the rear support plate 13, so that the connecting rod 3 can only move in the front-to-back direction and cannot rotate.

[0030] The interlocking plate 5 is movably mounted within the cable compartment 101 via a limiting pin 11 in the front-to-back direction. The interlocking plate 5 has an interlocking push-off part for pushing the locking rod 8 downwards. When the cable compartment door 102 is closed, the interlocking assembly moves forward, as... Figure 1-2 As shown, the interlocking pusher pushes the locking rod 8 downwards, causing the locking rod 8 to release its lock on the grounding switch trip plate 105. At this time, the grounding switch can be tripped. The interlocking plate 5 is provided with a socket 5-5 for the interlocking rod 6 to be inserted. When the cable compartment door 102 is closed, the interlocking rod 6 moves downwards, and the lower end of the interlocking rod 6 is inserted into the socket 5-5 of the interlocking plate 5, locking the interlocking assembly and preventing it from moving back and forth, thus ensuring that the cable compartment door 102 cannot be opened when the grounding switch is tripped. When the cable compartment door 102 is opened, the interlocking assembly moves backwards, as... Figure 3-4 As shown, when the locking lever 8 is released, it moves upward and locks the grounding switch trip plate 105. At this time, the grounding switch cannot be tripped. An interlocking component elastic element is provided between the interlocking assembly and the cable compartment 101 to drive the interlocking assembly backward when the cable compartment door 102 is opened. Specifically, the interlocking component elastic element is a connecting rod compression spring 4 mounted on the connecting rod 3. One end of the connecting rod compression spring 4 presses against the front support plate 12, and the other end presses against the connecting rod 3.

[0031] A locking hook 2 is rotatably mounted at the rear end of the connecting rod 3. A locking block 1, which cooperates with the locking hook 2, is fixedly mounted on the cable compartment door 102. The locking block 1 has a locking block pushing part that pushes the interlocking assembly forward when the cable compartment door 102 is closed. When the interlocking assembly moves forward, the rear support plate 13 pushes the locking hook 2 to rotate counterclockwise, thereby locking the locking hook 2 and the locking block 1, thus locking the cable compartment door 102. Figure 1 As shown, the rear support plate 13 constitutes a pushing structure for rotating the locking hook 2 to lock it with the locking block 1. When the interlocking assembly moves backward, the locking hook 2 separates from the rear support plate 13, as... Figure 3 As shown, the center of gravity of the lock hook 2 is off from the axis of rotation of the lock hook 2, so that the lock hook 2 rotates clockwise by its own weight and unlocks the lock block 1.

[0032] like Figure 5 As shown, the locking block 1 is cylindrical in shape. The front of the locking block 1 has a locking groove 1-1 for the insertion of the locking hook 2, and the rear of the locking block 1 has an axially extending threaded hole 1-2. A flat surface 1-3 is milled onto the outer circumference of the rear of the locking block 1. The cable compartment door 102 has a mounting groove, and the locking block 1 is installed in the mounting groove. The bottom of the mounting groove has a flat groove wall to prevent the locking block 1 from rotating within the groove. The locking block 1 is fixedly connected to the cable compartment door 102 by bolts, which pass through the cable compartment door 102 and are threaded into the threaded hole 1-2 of the locking block 1.

[0033] like Figure 6As shown, the locking hook 2 has two connecting arms 2-1 spaced apart on the left and right, forming a space between the two connecting arms 2-1 for the rear end of the connecting rod 3 to be inserted. The two connecting arms 2-1 are respectively provided with pin holes 2-2 for the pin shaft to pass through, so as to realize the locking hook 2 to be rotatably mounted on the connecting rod 3.

[0034] like Figure 7 As shown, the connecting rod 3 is a cylindrical rod extending front and rear. The front end of the connecting rod 3 has a small-diameter threaded section 3-1, used to pass through and be fixedly connected to the interlocking plate 5. The rear end of the connecting rod 3 has a flat section 3-2 milled out, with a pin through hole 3-3 for inserting a pin. The connecting rod through hole on the rear support plate 13 inside the cable compartment 101 is a flat hole. The flat section 3-2 at the rear end of the connecting rod 3 is inserted into the flat hole of the rear support plate 13 to achieve a circumferential anti-rotation fit between the connecting rod 3 and the rear support plate 13. The connecting rod 3 also has a connecting rod pin hole 3-4, in which a cotter pin is inserted. The cotter pin is used to limit the connection rod compression spring 4 from one side. (See reference...) Figure 1 , Figure 3 .

[0035] like Figure 8 As shown, the interlocking plate 5 includes a horizontal plate 5-1, a vertical plate 5-2 connected to the rear side of the horizontal plate 5-1, and a slanted plate 5-3 connected to the left side of the horizontal plate 5-1. The horizontal plate 5-1 has an elongated hole 5-4 extending forward and backward, through which a limiting pin 11 is inserted. The horizontal plate 5-1 also has an insertion hole 5-5 for inserting the interlocking rod 6. (Reference) Figure 1-4 Two limiting pins 11 are provided. The two limiting pins 11 pass through the interlocking plate 5 and are fixedly connected to the top plate of the cable chamber, thereby allowing the interlocking plate 5 to be movably installed in the cable chamber 101 in the front-back direction and to fit against the top plate of the cable chamber. The vertical plate 5-2 is provided with a vertical plate through hole 5-6. The small-diameter threaded section 3-1 at the front end of the connecting rod 3 passes through the vertical plate through hole 5-6 and is locked by two nuts, which are respectively pressed against both sides of the vertical plate 5-2. The front end of the inclined plate 5-3 has a pushing surface 5-7 that slopes downward from front to back. The pushing surface 5-7 constitutes an interlocking pushing part for pushing the locking rod 8 downward.

[0036] like Figure 9 As shown, the locking rod 8 is a cylindrical rod extending vertically. The lower part of the locking rod 8 has a long through groove 8-1 extending axially and radially through it, into which the front end of the inclined plate 5-3 of the interlocking plate 5 can be inserted. A through hole for mounting a pin is provided on the lower part of the groove wall of the long through groove 8-1. A roller 10 is rotatably mounted inside the long through groove 8-1 via a pin (see reference). Figure 1 , Figure 3The front end of the beveled plate 5-3 is inserted into the elongated slot 8-1. The beveled plate 5-3 pushes the roller 10 through the pushing surface 5-7, thereby driving the locking rod 8 to move downward. The use of the roller 10 in conjunction with the beveled plate 5-3 results in less resistance and smoother pushing. The locking rod 8 has two locking rod through-holes 8-2 spaced axially, such as... Figure 1 , Figure 3 As shown, a cotter pin is inserted into the upper locking rod through the pin hole 8-2 to limit the locking rod spring 9 from the top. A lower cotter pin is inserted into the lower locking rod through the pin hole 8-2. When the locking rod 8 moves upward, the lower cotter pin forms a stop with the fixing bracket 103 to prevent the locking rod 8 from coming off the fixing bracket 103.

[0037] like Figure 10 As shown, the interlocking rod 6 is a cylindrical rod extending vertically. A guide structure is provided at the bottom of the interlocking rod 6 to automatically guide it when it is inserted into the insertion hole 5-5 on the interlocking plate 5, ensuring smooth insertion. Specifically, the guide structure is a guide spherical surface 6-2. Alternatively, a guide conical surface could also be used. Two interlocking rod through-holes 6-1 are spaced axially on the interlocking rod 6. Figure 1 , Figure 3 As shown, a cotter pin is inserted into the upper interlocking rod through the pin hole 6-1 to limit the interlocking rod compression spring 7 from the top. A lower cotter pin is inserted into the lower interlocking rod through the pin hole 6-1. When the interlocking rod 6 moves upward, the lower cotter pin forms a stop with the fixing bracket 103 to prevent the interlocking rod 6 from falling off the fixing bracket 103.

[0038] When the gas-insulated switchgear needs to be powered on, such as Figure 1-2 As shown, when the cable compartment door 102 is closed, the locking block 1 pushes the connecting rod 3 forward. The locking hook 2 contacts the rear support plate 13 inside the cable compartment 101 and rotates counterclockwise. The locking hook 2 and the locking block 1 are locked together to lock the cable compartment door 102. The interlocking plate 5 moves forward with the connecting rod 3. The front end of the inclined plate 5-3 of the interlocking plate 5 is inserted into the long through groove 8-1 of the locking rod 8 and pushes the roller 10, thereby driving the locking rod 8 to move downward. This causes the upper end of the locking rod 8 to disengage from the grounding switch trip plate 105, releasing the locking of the grounding switch trip plate 105. At this time, the grounding switch can be tripped. When the grounding switch is tripped, the transmission shaft of the switch mechanism drives the transmission shaft crank arm 104 to rotate and press down the interlocking rod 6. The lower end of the interlocking rod 6 passes through the interlocking plate 5, and the interlocking plate 5 is locked and cannot move. The cable compartment door 102 is also locked and cannot be opened. At this time, the gas-filled cabinet can perform the main circuit power supply operation.

[0039] like Figure 3-4As shown, if it is necessary to open the cable compartment door 102, it must be done while the main circuit is de-energized. First, close the grounding switch. When the grounding switch is closed, the transmission shaft of the switch mechanism drives the transmission shaft crank arm 104 to rotate upward. The interlocking rod 6 moves upward under the action of the interlocking rod compression spring 7, unlocking the interlocking plate 5. At this time, the cable compartment door 102 can be opened. The connecting rod 3 moves backward under the action of the connecting rod compression spring 4 until the milled flat part of the rear part of the connecting rod 3 completely passes through the flat hole of the rear support plate 13 inside the cable compartment 101. The locking hook 2 rotates and disengages from the locking block 1 under the action of gravity, and the cable compartment door 102 can be opened. When the cable compartment door 102 is opened, the interlocking plate 5 moves backward with the connecting rod 3. The top rod moves upward under the action of the top rod compression spring. The grounding switch tripping plate 105 is locked by the top rod. At this time, the grounding switch tripping operation cannot be performed.

[0040] The cable compartment door interlocking device of the present invention has a simple structure. Regardless of the distance, a single interlocking device can achieve mutual interlocking between the cable compartment door and the switching mechanism, preventing misoperation and greatly improving safety protection.

[0041] Of course, the present invention is not limited to the embodiments described above.

[0042] In the above embodiment, the center of gravity of the locking hook is offset from the axis of rotation of the locking hook. When the rear support plate in the cable chamber separates from the locking hook, the locking hook rotates under its own weight to unlock the locking block. The structure is simple and easy to arrange. In other embodiments, a pin is mounted on the connecting rod, and the locking hook is rotatably assembled on the pin. A torsion spring can be set between the locking hook and the pin. When the rear support plate separates from the locking hook, the locking hook rotates under the action of the torsion spring and separates from the locking block.

[0043] In the above embodiments, the interlocking assembly includes an interlocking plate and a connecting rod. The front end of the connecting rod is fixedly connected to the interlocking plate, and the interlocking plate is provided with an interlocking push part. The locking hook is rotatably installed at the rear end of the connecting rod. The interlocking plate and the connecting rod can be processed separately, which is relatively convenient, and also convenient for assembly in the cable chamber. In other embodiments, the interlocking assembly can also be a single irregularly shaped plate extending front and back. The irregularly shaped plate is movably installed in the cable chamber in the front and back direction. An inclined push surface is provided at the front end of the irregularly shaped plate to push the locking rod downward. The locking hook is rotatably installed at the rear end of the irregularly shaped plate. The specific shape of the irregularly shaped plate is not limited, and there can be many deformable structures, as long as they meet the usage requirements.

[0044] In the above embodiment, front and rear support plates are spaced apart along the front-to-back direction inside the cable chamber. The connecting rod is movably inserted into the connecting rod through-holes on the front and rear support plates and is circumferentially anti-rotated with the rear support plate, thereby restricting the connecting rod to move only in the front-to-back direction and preventing rotation. This installation method of the connecting rod is simple in structure and easy to assemble. In other embodiments, a dovetail-shaped slider extending in the front-to-back direction can be fixedly connected to the top plate of the cable chamber, and a dovetail groove extending axially can be provided on the connecting rod. The dovetail groove is slidably installed on the dovetail-shaped slider, thereby realizing the connecting rod moving in the front-to-back direction inside the cable chamber. This installation method has a better guiding effect on the connecting rod and can better ensure that the connecting rod moves linearly in the front-to-back direction.

[0045] In the above embodiment, the rear end of the connecting rod is machined with a flat portion, and the connecting rod through hole on the rear support plate is a flat hole. The flat portion is inserted into the flat hole to achieve a circumferential anti-rotation fit between the connecting rod and the rear support plate. The structure is simple, with few parts and easy assembly. In other embodiments, a long groove extending forward and backward can be provided at the rear end of the connecting rod, and a downwardly extending anti-rotation pin can be fixed on the top plate of the cable compartment. The anti-rotation pin is inserted into the long groove at the rear end of the connecting rod to achieve a circumferential anti-rotation fit between the connecting rod and the rear support plate.

[0046] In the above embodiment, the interlocking plate has an elongated hole extending forward and backward, through which a limiting pin is inserted. The limiting pin is fixedly connected to the top plate of the cable compartment, allowing the interlocking plate to be movably installed in the cable compartment in the forward and backward direction. The interlocking plate has a simple structure and is easy to assemble. In other embodiments, a tapering slide rail extending forward and backward can be fixedly installed on the top plate of the cable compartment, and two sliders are spaced apart forward and backward on the interlocking plate. The sliders are slidably installed in the tapering slide rail, thereby enabling the interlocking plate to be movably installed in the cable compartment in the forward and backward direction.

[0047] In the above embodiment, a pushing surface that slopes downwards from front to back is provided at the front end of the interlocking plate. The pushing surface constitutes the interlocking pushing part, which pushes the locking rod downwards. In other embodiments, a pushing protrusion can also be provided on the interlocking plate, and correspondingly, an inclined pushing mating surface is provided on the locking rod. When the interlocking plate moves forward, the pushing protrusion pushes against the inclined pushing mating surface of the locking rod, thereby causing the locking rod to move downwards. In this case, the pushing protrusion constitutes the interlocking pushing part.

[0048] In the above embodiment, a long through groove is provided at the lower part of the locking rod, and a roller is pinned to the long through groove. The front end of the beveled plate is inserted into the long through groove and pushes the roller, thereby driving the locking rod to move downward. The roller and the beveled plate push together, resulting in less resistance and smoother pushing. In other embodiments, only a pin can be installed at the lower part of the long through groove, without the need for a roller. The front end of the beveled plate directly pushes against the pin, thereby driving the locking rod to move downward. In this case, the pin forms a push-fit structure with the beveled plate.

[0049] The present invention also provides an embodiment of a cable compartment door interlocking device for a gas-insulated switchgear, the specific structure of which is the same as the structure of the cable compartment door interlocking device in the above-mentioned gas-insulated switchgear embodiment and various embodiments, and will not be described again here.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A cable compartment door interlocking device for a gas-insulated switchgear, characterized in that: The system includes a locking rod that is movable vertically mounted on the cabinet. An elastic element between the locking rod and the cabinet is provided to drive the locking rod upwards when the cable compartment door is opened, thereby locking the grounding switch trip plate and preventing the grounding switch from tripping. It also includes an interlocking assembly that is movable longitudinally mounted inside the cable compartment. The interlocking assembly has an interlocking push part that pushes the locking rod downwards when the cable compartment door is closed, releasing the locking of the grounding switch trip plate. A locking hook is rotatably mounted on the interlocking assembly, and a locking block is fixedly mounted on the cable compartment door. The locking block has a mechanism that pushes the interlocking assembly forward when the cable compartment door is closed, thereby interlocking the circuit. The component includes a locking block pushing part that pushes the locking rod downwards; a pushing structure is provided in the cable chamber for pushing the locking hook to rotate and lock with the locking block when the interlocking component moves forward; it also includes an interlocking rod that is movably mounted on the cabinet in the vertical direction; the interlocking component has a socket for the interlocking rod to be inserted and locked when the drive shaft crank arm presses down on the interlocking rod; an interlocking rod elastic element is provided between the interlocking rod and the cabinet to drive the interlocking rod upwards and unlock the interlocking component when the drive shaft crank arm is released from pressing down; and an interlocking component elastic element is provided between the interlocking component and the cable chamber to drive the interlocking component to move backwards when the cable chamber door is opened.

2. The cable compartment door interlocking device for a gas-insulated switchgear according to claim 1, characterized in that: The center of gravity of the locking hook is off from the axis of rotation of the locking hook. When the pushing structure separates from the locking hook, the locking hook rotates by its own weight to unlock the locking block.

3. The cable compartment door interlocking device for a gas-insulated switchgear according to claim 1, characterized in that: The interlocking assembly includes an interlocking plate and a connecting rod. The interlocking plate and the connecting rod are movably installed in the cable chamber in the front-back direction. The front end of the connecting rod is fixedly connected to the interlocking plate. The interlocking plate is provided with the interlocking push part. The lock hook is rotatably installed at the rear end of the connecting rod.

4. The cable compartment door interlocking device for a gas-insulated switchgear according to claim 3, characterized in that: The cable compartment is provided with front and rear support plates at intervals along the front-to-back direction. Each of the front and rear support plates has a connecting rod through hole. The connecting rod is movably installed in the connecting rod through hole of the front and rear support plates and is circumferentially anti-rotationally engaged with the rear support plate.

5. The cable compartment door interlocking device for a gas-insulated switchgear according to claim 4, characterized in that: The rear end of the connecting rod has a flat section, and the connecting rod through hole on the rear support plate is a flat hole. The flat section is inserted into the flat hole to achieve a circumferential anti-rotation fit between the connecting rod and the rear support plate.

6. The cable compartment door interlocking device for a gas-insulated switchgear according to claim 3, characterized in that: The interlocking plate is provided with elongated holes extending forward and backward. At least two limiting pins are movably installed in the elongated holes. Each limiting pin is fixedly connected to the top plate of the cable chamber, thereby allowing the interlocking plate to be movably installed in the cable chamber in the forward and backward direction and to fit against the top plate of the cable chamber.

7. The cable compartment door interlocking device for a gas-insulated switchgear according to claim 3 or 6, characterized in that: The interlocking plate includes a horizontal plate, a vertical plate connected to the rear side of the horizontal plate, and a slanted plate connected to the left side of the horizontal plate. The front end of the connecting rod is fixedly connected to the vertical plate. The front end of the slanted plate has a pushing surface that slopes downward from front to back. The pushing surface constitutes the interlocking pushing part. The locking rod has a pushing engagement structure for cooperating with the pushing surface.

8. The cable compartment door interlocking device for a gas-insulated switchgear according to claim 7, characterized in that: The lower part of the locking rod has a long through groove that extends along its axis and passes through radially, into which the front end of the inclined plate can be inserted. A roller is rotatably installed in the long through groove. The roller constitutes the push-fit structure. The inclined plate pushes the roller, thereby driving the locking rod to move downward.

9. The cable compartment door interlocking device for a gas-insulated switchgear according to any one of claims 1-6, characterized in that: The bottom of the interlocking rod is provided with a guide structure for automatically guiding the interlocking rod when it is inserted into the socket of the interlocking assembly.

10. A gas-insulated switchgear, comprising a cabinet, the cabinet containing a switch mechanism compartment and a cable compartment, wherein a grounding switch trip plate and a drive shaft crank arm connected to the drive shaft of the switch mechanism are movably installed in the cabinet, and a cable compartment door interlocking device is provided between the switch mechanism and the cable compartment door, characterized in that: The cable compartment door interlocking device is the cable compartment door interlocking device for gas-filled cabinets as described in any one of claims 1-9.

Images