A voltage transformer switch cabinet for power transmission system

Abstract

The invention discloses a voltage transformer switch cabinet for a power transmission system, comprising a cabinet body, a trolley room provided in the cabinet body, a trolley provided in the trolley room, a screw rod rotatably provided at the bottom of the trolley room through an axle seat, a threaded block matched with the screw rod thread is provided at the bottom of the trolley, a door is provided at the opening of the trolley room, the door comprises two symmetrically arranged door panels, the side portions of the door panels are hingedly connected to the cabinet body, circular grooves are provided on the two door panels at the same height, horizontal channels are provided between the opposite surfaces of the two door panels and the upper and lower sides of the corresponding circular grooves, sprockets are rotatably installed in the circular grooves, and a chain block meshed with the handwheel is driven by the handwheel, so that the chain block at the rear can push the chain block at the front to form a linkage effect, and the trolley can be easily rotated only by rotating the two handwheels at the same time, and the resistance of the rotating chain is very large when only one handwheel is rotated, so that the trolley can be easily pushed to move only when the two door panels are closed and the two handles are rotated at the same time, thereby avoiding misoperation.

Description

Technical Field

[0001] The present invention relates to the field of switch cabinets, and in particular to a voltage transformer switch cabinet for a power transmission system. Background Art

[0002] In switchgear engineering applications, to ensure the personal safety of workers during maintenance and inspection, interlocking is required between different components of the DC switchgear. For example, the interlocking between the cabinet door and the circuit breaker trolley is very important. Specifically, when the circuit breaker trolley is in the working position, the cabinet door cannot be opened for safety reasons. The cabinet door can only be opened when the circuit breaker is returned to the test position. Therefore, how to achieve reliable interlocking between the cabinet door and the circuit breaker trolley has always been a hot research topic.

[0003] Low-frequency transmission system voltage transformer switchgear is used in marine power generation lines. The safety interlock of the existing switchgear trolley is not safe enough. After long-term use, workers are prone to misoperation due to lack of awareness, which can easily lead to danger. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a voltage transformer switch cabinet for a power transmission system which is not prone to misoperation and has high safety.

[0005] In order to solve the above technical problems, the present invention includes a cabinet body, a trolley room is arranged in the cabinet body, a trolley is arranged in the trolley room, a screw rod is arranged in the bottom of the trolley room through an axle seat, a threaded block is provided at the bottom of the trolley to cooperate with the screw rod thread, a door is arranged at the opening of the trolley room, and the door includes two symmetrically arranged door panels, the side portions of the door panels are hingedly connected to the cabinet body, circular grooves are provided on the two door panels at the same height, horizontal channels are provided between the opposite surfaces of the two door panels and the upper and lower sides of the corresponding circular grooves, sprockets are rotatably installed in the circular grooves, and when the two door panels are in a closed state, the same The channels at different heights are aligned and connected, and a chain passing through the channel is wound between the two sprockets. The chain is composed of multiple chain blocks connected in sequence. The chain blocks are long magnets with two magnetic poles at both ends of the chain blocks. The two adjacent chain blocks are connected by magnetic attraction. The arc-shaped space between the circular groove and the sprocket and the channel form a complete runway-shaped cavity for accommodating the chain. The outer end of the circular groove is rotatably installed with a handwheel fixedly connected to the sprocket. The central axis of the sprocket is located inside the trolley chamber after passing through the door panel. The inner end of the central axis and the outer end of the corresponding screw rod can be connected through a clamping structure.

[0006] Furthermore, both ends of the chain block are spherical.

[0007] In order to ensure the meshing of the chain block and the sprocket, a tooth groove meshing with the teeth of the sprocket is provided on the side of the chain block facing the sprocket.

[0008] Preferably, a linkage structure is provided between the door panel and the trolley chamber, the linkage structure includes a locking rod, the inner end of the locking rod is hingedly connected to the bottom of the trolley chamber, a hook is provided at the outer end of the locking rod, and a slot is provided in the door panel corresponding to the position of the hook. The bottom of the locking rod is connected to the bottom of the trolley chamber by a spring. When the door panel is closed, the hook is engaged with the slot to lock the door panel from the inside, and the door panel cannot be opened. An unlocking rod is provided at the bottom of the trolley. When the trolley moves to a position close to the door panel, the unlocking rod presses down the locking rod to separate the hook from the slot, and the door panel is unlocked.

[0009] In order to facilitate the insertion of the hook into the slot, the hook of the hook faces upward and is provided with a first inclined surface obliquely facing the door panel, and a clamping block cooperating with the hook is provided in the slot.

[0010] Preferably, a self-locking structure is provided between the door panel and the screw rod, the self-locking structure includes a horizontal tube at the bottom of the trolley chamber, a horizontal rod is provided in the horizontal tube, the inner end of the horizontal rod is connected to the inner end of the horizontal tube by a tension spring, a through hole is provided at the top of the horizontal tube, a vertical rod that can slide up and down is provided in the through hole, a groove is provided between the inner ends of the horizontal rod and the vertical rod, the side of the groove close to the outer end of the horizontal rod is a second inclined surface obliquely upward, the lower end of the vertical rod is a circular arc surface, the upper end of the vertical rod is provided with a plurality of tooth grooves, the horizontal rod is made of a material that can be attracted by magnetic force, and a magnet is embedded in the position of the outer end of the horizontal tube corresponding to the inner side of the door panel.

[0011] To ensure that the crossbar cannot be moved by manual operation, a blocking plate is provided at the outer end of the cross tube, and the blocking plate is made of plastic material that cannot be attracted by magnetic force.

[0012] Preferably, the clamping structure includes a plurality of grooves on the outer end of the screw rod and a protrusion on the inner end of the central shaft. When the door panel is closed, the protrusion docks with the corresponding grooves.

[0013] In order to further improve the installation stability of the vertical rod, a guide sleeve is installed on the vertical rod, and the guide sleeve is fixedly installed on the top of the horizontal tube.

[0014] Furthermore, a busbar room, a cable room, and an instrument room are provided in the cabinet. A three-phase main busbar is provided in the busbar room. An upper contact box and a lower contact box are provided in the busbar room and the cable room respectively. Openings corresponding to the upper contact box and the lower contact box are provided on the side wall of the trolley room. The two contact arms of the trolley correspond to the upper contact box and the lower contact box respectively. A voltage transformer is also provided in the cable room.

[0015] In summary, when the door panels are closed and the trolley is in the closing position, the present invention automatically locks the door panels through the interlocking structure, ensuring that the trolley chamber cannot be opened in the closed state. After the door panels are opened, the self-locking structure automatically locks the screw rod, ensuring that the trolley cannot be moved when the door panels are open. If the trolley needs to be repaired, the screw rod can be removed. After the door panels are closed, the two door panels form a complete runway-shaped cavity. At this time, shaking the two handwheels simultaneously can cause the chain to rotate in the runway-shaped cavity. This process is different from the conventional chain movement method. Multiple chain blocks fill the entire runway-shaped cavity. By driving the chain blocks engaged with them by the handwheels, the chain blocks at the back can push the chain blocks at the front, forming a linkage effect. The chain can be easily rotated only by turning both handwheels at the same time. Turning only one handwheel will cause great resistance to the chain rotation. This ensures that the trolley can only be easily pushed and moved when both door panels are closed and both handles are turned simultaneously, avoiding misoperation. When the chain blocks span the two channels, they can also assist in connecting the two door panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] Figure 1 This is a schematic diagram of the cabinet structure of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part I;

[0019] Figure 3 for Figure 2 A schematic diagram of the partially enlarged structure of part II;

[0020] Figure 4 for Figure 2 A schematic diagram of the partially enlarged structure of Part III;

[0021] Figure 5 This is a schematic diagram of the cooperation between the two door panels and the chain when they are closed. DETAILED DESCRIPTION

[0022] Refer to the attached Figure 1-5A voltage transformer switch cabinet for a power transmission system includes a cabinet body 1, a trolley room 2 is provided in the cabinet body, a trolley 3 is provided in the trolley room, a screw rod 4 is provided in the bottom of the trolley room through a shaft seat, a threaded block is provided at the bottom of the trolley that cooperates with the screw rod thread, and the trolley can be driven to move by rotating the screw rod to realize the closing and opening of the switch cabinet, and a door is provided at the opening of the trolley room, and the door includes two symmetrically arranged door panels 5, the side of the door panels is hingedly connected to the cabinet body, and circular grooves 6 are provided on the two door panels at the same height, and horizontal channels 7 are provided between the opposite surfaces of the two door panels and the upper and lower sides of the corresponding circular grooves, and sprockets 8 are rotatably installed in the circular grooves. When the two door panels are in a closed state, the channels 7 at the same height are aligned and connected A chain passing through the channel 7 is wound between the two sprockets. The chain is composed of multiple chain blocks 10 connected in sequence. The chain blocks are long magnets with two magnetic poles at both ends of the chain blocks. The two adjacent chain blocks are connected by magnetic attraction. Both ends of the chain blocks are spherical. The arc-shaped space between the circular groove 6 and the sprocket and the channel form a complete runway-shaped cavity for accommodating the chain. The diameter of the runway-shaped cavity is slightly larger than the diameter of the chain block. The outer end of the circular groove 6 is rotatably installed with a handwheel 11 fixedly connected to the sprocket 8. The chain block is provided with a tooth groove engaging with the teeth of the sprocket on the side facing the sprocket. The central axis 12 of the sprocket 8 is located inside the handcart room after passing through the door panel. The inner end of the central axis and the outer end of the corresponding screw rod can be docked through a clamping structure.

[0023] A interlocking structure is set between the door panel and the trolley chamber, which includes a locking rod 13. The inner end of the locking rod is hingedly connected to the bottom of the trolley chamber. A hook is set at the outer end of the locking rod. A slot 14 is provided at the position of the door panel corresponding to the hook. The bottom of the locking rod is connected to the bottom of the trolley chamber by a spring 15. When the door panel is closed, the hook is locked in the slot to lock the door panel from the inside, and the door panel cannot be opened. An unlocking rod 16 is set at the bottom of the trolley. When the trolley moves to a position close to the door panel, the unlocking rod presses down the locking rod to separate the hook from the slot. At this time, the door panel is unlocked, the hook of the hook faces upward and is provided with a first inclined surface obliquely facing the door panel, and a card block cooperating with the hook is provided in the slot.

[0024] A self-locking structure is provided between the door panel and the screw rod. The self-locking structure includes a horizontal tube 17 at the bottom of the trolley room. A horizontal rod 18 is provided in the horizontal tube 17. The inner end of the horizontal rod 18 is connected to the inner end of the horizontal tube by a tension spring 19. A through hole is provided on the top of the horizontal tube. A vertical rod 20 that can slide up and down is provided in the through hole. A notch 21 is provided between the inner ends of the horizontal rod and the vertical rod. The side of the notch 21 close to the outer end of the horizontal rod is a second inclined surface that is inclined upward. The lower end of the vertical rod is an arc surface. The upper end of the vertical rod is It is provided with multiple teeth and grooves 22. Under the tension of the tension spring, the horizontal rod moves inward and drives the vertical rod upward through the second inclined surface. After the screw rod engages with the teeth and grooves 22, the screw rod can be locked and cannot be rotated. The horizontal rod is made of a material that can be attracted by magnetic force. A magnet 23 is embedded in the inner side of the door panel corresponding to the outer end of the horizontal tube. When the door panel is closed, the magnet attracts the horizontal rod to move outward, the second inclined surface separates from the lower end of the vertical rod, the vertical rod falls, the teeth and groove separate from the screw rod, and the lock on the screw rod is released.

[0025] The outer end of the cross tube is provided with a blocking plate 24, which is made of a plastic material that is not attracted by magnetic force. This design can ensure that the cross bar cannot be moved by manual operation, plays a limiting role in the cross bar, and prevents dust from entering the cross tube, ensuring the stable operation of the self-locking structure.

[0026] The clamping structure includes several grooves 25 on the outer end of the screw and a protrusion 26 on the inner end of the center shaft. When the door panel is closed, the protrusion docks with the corresponding groove 25. At this time, the screw can be driven to rotate by the handwheel. When the door panel is opened, the center shaft automatically separates from the screw and cannot drive the screw to rotate. This can achieve the goal of not being able to drive the trolley to move after the door panel is opened, avoiding misoperation.

[0027] A guide sleeve 27 is mounted on the vertical rod 20 and fixedly mounted on the top of the horizontal tube. This design can further improve the installation stability of the vertical rod.

[0028] A handle groove is provided at the eccentric position of the outer side surface of the handwheel, and one end of the handle 27 is hingedly connected in the handle groove. A torsion spring is installed at the handle hinge. Normally, the handle is automatically retracted into the handle groove under the action of the torsion spring. When it needs to be used, the handle is opened to drive the handwheel to rotate.

[0029] The cabinet is also provided with a busbar room 28, a cable room 29, and an instrument room 30. The busbar room is provided with a three-phase main busbar. The busbar room and the cable room are provided with an upper contact box 31 and a lower contact box 32 respectively. The three-phase main busbar is connected to the upper contact box. The side wall of the trolley room is provided with openings corresponding to the upper contact box and the lower contact box. The two contact arms of the trolley correspond to the upper contact box and the lower contact box respectively. A voltage transformer 33 connected to the lower contact box is also provided in the cable room.

[0030] Working Principle: When the door panels are closed and the trolley is in the closing position, a chain mechanism automatically locks the door panels, preventing the trolley from opening the compartment while the door panels are closed. Once the door panels are opened, a self-locking mechanism automatically locks the screw, preventing the trolley from moving while the door panels are open. If the trolley requires maintenance, the screw can be removed. Once the door panels are closed, the two panels close to form a complete runway-like cavity. Simultaneously turning both handwheels rotates the chain within the cavity. This process differs from conventional chain movement. Multiple chain segments fill the entire cavity. The handwheels drive the meshed chain segments, causing the rear chain segments to push the front chain segments, creating a linkage effect. Simultaneous rotation of both handwheels is required for easy movement. Turning only one handwheel creates significant resistance to the chain. This ensures that the trolley can be moved easily only when both door panels are closed and both handles are turned simultaneously, preventing accidental operation. When the chain segments span the two channels, they also serve to connect the two door panels.

Claims

1. A voltage transformer switchgear for a power transmission system, characterized in that: The invention comprises a cabinet body, a trolley room is arranged inside the cabinet body, a trolley is arranged in the trolley room, a screw rod is arranged at the bottom of the trolley room through an axle seat, a threaded block is provided at the bottom of the trolley which cooperates with the screw rod thread, a door is arranged at the opening of the trolley room, the door comprises two symmetrical door panels, the side parts of the door panels are hingedly connected to the cabinet body, circular grooves are provided on the two door panels at the same height, horizontal channels are provided between the opposite surfaces of the two door panels and the upper and lower sides of the corresponding circular grooves, sprockets are rotatably installed in the circular grooves, when the two door panels are in a closed state, the channels at the same height are aligned and connected, a chain passing through the channel is arranged between the two sprockets, the chain is composed of a plurality of chain blocks connected in sequence, the chain block is a long magnet, the two ends of the chain block are two magnetic poles respectively, the two adjacent chain blocks are connected by magnetic attraction, and the arc shape between the circular groove and the sprocket The space and channel form a complete runway-shaped cavity for accommodating the chain. The outer end of the circular groove is rotatably installed with a handwheel fixedly connected to the sprocket. The center axis of the sprocket passes through the door panel and is located inside the trolley chamber. The inner end of the center axis and the corresponding outer end of the screw rod can be connected through a clamping structure; a self-locking structure is provided between the door panel and the screw rod, and the self-locking structure includes a horizontal tube at the bottom of the trolley chamber, a horizontal rod is arranged in the horizontal tube, and the inner end of the horizontal rod and the inner end of the horizontal tube are connected by a tension spring. A through hole is provided at the top of the horizontal tube, and a vertical rod that can slide up and down is provided in the through hole. A notch is provided between the inner ends of the horizontal rod and the vertical rods, and the side of the notch close to the outer end of the horizontal rod is a second inclined surface obliquely upward. The lower end of the vertical rod is a circular arc surface, and the upper end of the vertical rod is provided with multiple tooth grooves. The cross rod is made of a material that can be attracted by magnetic force, and a magnet is embedded in the inner side of the door panel corresponding to the outer end of the cross tube.

2. A voltage transformer switchgear for a power transmission system according to claim 1, characterized in that : Both ends of the chain block are spherical.

3. A voltage transformer switchgear for a power transmission system according to claim 1, characterized in that : The chain block has tooth grooves on the side facing the sprocket that mesh with the sprocket teeth.

4. A voltage transformer switchgear for a power transmission system according to claim 1, characterized in that : A interlocking structure is set between the door panel and the trolley chamber, and the interlocking structure includes a locking rod. The inner end of the locking rod is hingedly connected to the bottom of the trolley chamber, and a hook is set at the outer end of the locking rod. A slot is opened at the position of the door panel corresponding to the hook. The bottom of the locking rod is connected to the bottom of the trolley chamber through a spring. When the door panel is closed, the hook is locked in the slot to lock the door panel from the inside, and the door panel cannot be opened. An unlocking rod is set at the bottom of the trolley. When the trolley moves to a position close to the door panel, the unlocking rod presses down the locking rod to separate the hook from the slot, and the door panel is unlocked.

5. A voltage transformer switchgear for a power transmission system as claimed in claim 4, characterized in that : The hook of the card hook faces upward and is provided with a first inclined surface obliquely toward the door panel, and a card block that cooperates with the card hook is provided in the card slot.

6. A voltage transformer switchgear for a power transmission system according to claim 1, characterized in that : A blocking plate is provided at the outer end of the horizontal pipe, and the blocking plate is made of plastic material that cannot be attracted by magnetic force.

7. A voltage transformer switchgear for a power transmission system according to claim 1, characterized in that : The clamping structure includes several grooves on the outer end of the screw and a protrusion on the inner end of the center shaft. When the door panel is closed, the protrusion docks with the corresponding grooves.

8. A voltage transformer switchgear for a power transmission system according to claim 1, characterized in that : A guide sleeve is mounted on the vertical rod, and the guide sleeve is fixedly installed on the top of the horizontal tube.

9. A voltage transformer switchgear for a power transmission system according to claim 1, characterized in that The cabinet is equipped with a busbar room, a cable room, and an instrument room. The busbar room is equipped with a three-phase main busbar. The busbar room and the cable room are equipped with an upper contact box and a lower contact box respectively. The side wall of the trolley room is provided with openings corresponding to the upper contact box and the lower contact box respectively. The two contact arms of the trolley correspond to the upper contact box and the lower contact box respectively. A voltage transformer is also provided in the cable room.

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