Voltage transformer switch cabinet for power transmission system

Abstract

The invention discloses a voltage transformer switch cabinet for a power transmission system, which comprises a cabinet body, a handcart chamber is arranged in the cabinet body, a handcart is arranged in the handcart chamber, a screw rod is rotatably arranged at the bottom in the handcart chamber through a shaft seat, a threaded block in threaded fit with the screw rod is arranged at the bottom of the handcart, a door is arranged at an opening of the handcart chamber, and the door comprises two door plates which are symmetrically arranged. The side portions of the door plates are hinged to the cabinet body, circular grooves are formed in the two door plates at the same height, horizontal channels are formed between the opposite faces of the two door plates and the upper sides and the lower sides of the corresponding circular grooves, chain wheels are rotationally installed in the circular grooves, chain blocks meshed with the chain wheels are driven through hand wheels, the rear chain blocks can push the front chain blocks, and the linkage effect is formed. And the handcart can be easily rotated only by simultaneously rotating the two hand wheels, and only one hand wheel is rotated, so that the resistance of rotating the chain is very large, the handcart can be easily pushed to move only when the two door plates are closed and the two handles are simultaneously rotated, and misoperation is avoided.

Description

Technical Field

[0001] The 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, in order to ensure the personal safety of workers during maintenance and inspection, interlocking is required between different components of 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 to ensure safety. The cabinet door can only be opened when the circuit breaker returns to the test position. Therefore, how to achieve reliable interlocking between the cabinet door and the circuit breaker trolley has always been a hot topic of research.

[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 comprises a cabinet body, a trolley room is arranged in the cabinet body, a trolley is arranged in the trolley room, a screw rod is rotatably arranged in the bottom of the trolley room through an axle seat, a threaded block matching with the screw rod thread is arranged at the bottom of the trolley, a door is arranged at the opening of the trolley room, the door comprises two symmetrically arranged door panels, the side parts of the door panels are hingedly connected to the cabinet body, circular grooves are arranged at the same height of the two door panels, horizontal channels are arranged 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, a chain passing through the channel is wound between the two sprockets, the chain is formed by 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, and 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, a handwheel fixedly connected to the sprocket is rotatably installed on the outer end of the circular groove, the central axis of the sprocket is located inside the handcart chamber after passing through the door panel, and the inner end of the central axis can be connected to the corresponding outer end of the lead screw 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 with 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, an interlocking structure is provided between the door panel and the trolley chamber, the interlocking 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 in 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 card hook into the card slot, the hook of the card hook faces upward and is provided with a first inclined surface obliquely facing the door panel, and a card block cooperating with the card hook is provided in the card 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 arranged 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 pointing upward, the lower end of the vertical rod is an 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 inner side of the door panel corresponding to the outer end of the horizontal tube.

[0011] To ensure that the crossbar cannot be moved by manual operation, a blocking plate is arranged 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 at the outer end of the screw rod and a protrusion at the inner end of the central shaft, and 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 mounted 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 arranged in the cabinet. A three-phase main busbar is arranged in the busbar room. An upper contact box and a lower contact box are arranged in the busbar room and the cable room respectively. Openings corresponding to the upper contact box and the lower contact box are arranged 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 arranged in the cable room.

[0015] In summary, when the door panels are closed and the trolley is in the closing working position, the door panels are automatically locked by the interlocking structure to ensure that the trolley chamber cannot be opened in the closing state. After the door panels are opened, the screw rod is automatically locked by the self-locking structure to ensure that the trolley cannot be moved when the door panels are opened. If the trolley needs to be repaired, the screw rod can be removed. After the door panels are closed, the two door panels are closed to form a complete runway-shaped cavity. At this time, by shaking the two hand wheels at the same time, the chain can be rotated in the runway-shaped cavity. This process is different from the conventional chain movement method. Multiple chain blocks fill the entire runway-shaped cavity. The chain blocks engaged with the hand wheels can be driven by the chain blocks at the back to push the chain blocks at the front to form a linkage effect. The two hand wheels can be rotated easily at the same time. If only one hand wheel is rotated, the resistance to rotating the chain is very large, ensuring 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 to avoid misoperation. When the chain block spans across the two channels, it can also assist in connecting the two door panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figure 1 It is a schematic diagram of the cabinet structure of the present invention; Figure 2 for Figure 1 A schematic diagram of the partial enlarged structure of part Ⅰ; Figure 3 for Figure 2 A schematic diagram of the partial enlarged structure of part II; Figure 4 for Figure 2 A schematic diagram of the partial enlarged structure of part III; Figure 5 It is a schematic diagram of the cooperation between the two door panels and the chain when the two door panels are closed. DETAILED DESCRIPTION

[0017] Refer to the attached Figure 1-5The voltage transformer switch cabinet for a power transmission system comprises a cabinet body 1, a trolley room 2 is arranged in the cabinet body, a trolley 3 is arranged in the trolley room, a screw rod 4 is arranged in the bottom of the trolley room through a shaft seat, a threaded block matched with the screw rod thread is arranged at the bottom of the trolley, and the trolley can be driven to move by rotating the screw rod to realize the closing and opening of the switch cabinet, a door is arranged at the opening of the trolley room, and the door comprises 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, and the chain is formed by connecting a plurality of chain blocks 10 in sequence. The chain block is a long magnet with two magnetic poles at both ends of the chain block. Two adjacent chain blocks are connected by magnetic attraction, and both ends of the chain block are spherical. The arc-shaped space between the circular groove 6 and the sprocket and the channel form a complete track-shaped cavity for accommodating the chain. The diameter of the track-shaped cavity is slightly larger than the diameter of the chain block. A handwheel 11 fixedly connected to the sprocket 8 is rotatably installed on the outer end of the circular groove 6. A tooth groove meshing with the teeth of the sprocket is provided on the side of the chain block facing the sprocket. The central axis 12 of the sprocket 8 is located inside the handcart chamber after passing through the door panel, and the inner end of the central axis can be connected to the corresponding outer end of the lead screw through a clamping structure.

[0018] A locking structure is arranged between the door panel and the trolley chamber, and the locking structure 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 arranged at the outer end of the locking rod, and 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 engaged in the slot to lock the door panel from the inside, and the door panel cannot be opened. An unlocking rod 16 is arranged 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 block cooperating with the hook is provided in the slot.

[0019] A self-locking structure is provided between the door panel and the screw rod, and 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 at 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, and the side of the notch 21 close to the outer end of the horizontal rod is a second inclined surface obliquely upward, the lower end of the vertical rod is an arc surface, and the upper end of the vertical rod is a circular arc surface. A plurality of tooth grooves 22 are provided. Under the tension of the tension spring, the cross bar moves inward and drives the vertical bar upward through the second inclined surface. After the screw rod is engaged with the tooth groove 22, the screw rod can be locked and cannot be rotated. The cross bar is made of a material that can be attracted by magnetic force. A magnet 23 is embedded on the inner side of the door panel corresponding to the outer end of the cross tube. When the door panel is closed, the magnet attracts the cross bar to move outward, the second inclined surface separates from the lower end of the vertical rod, the vertical rod falls, the tooth groove separates from the screw rod, and the lock on the screw rod is released.

[0020] The outer end of the horizontal tube is provided with a blocking plate 24, which is made of a plastic material that cannot be attracted by magnetic force. This design can ensure that the horizontal bar cannot be moved by manual operation, limit the horizontal bar, and prevent dust from entering the horizontal tube, ensuring the stable operation of the self-locking structure.

[0021] The clamping structure includes a plurality of grooves 25 at the outer end of the screw rod and a protrusion 26 at 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 rod can be driven to rotate by the hand wheel. When the door panel is opened, the center shaft automatically separates from the screw rod and cannot drive the screw rod to rotate. This can achieve the effect that the trolley cannot be driven to move after the door panel is opened, thereby avoiding misoperation.

[0022] A guide sleeve 27 is sleeved 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.

[0023] A handle groove is provided at the eccentric position of the outer side surface of the hand wheel, and one end of the handle 27 is hingedly connected in the handle groove. A torsion spring is installed at the hinge of the handle. Under the action of the torsion spring, the handle is automatically retracted into the handle groove. When it is needed, the handle is opened to drive the hand wheel to rotate.

[0024] The cabinet is also provided with a busbar room 28, a cable room 29, and an instrument room 30. A three-phase main busbar is arranged in the busbar room. An upper contact box 31 and a lower contact box 32 are arranged in the busbar room and the cable room 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 arranged in the cable room.

[0025] Working principle: When the door panel is closed and the trolley is in the closing position, the door panel is automatically locked by the interlocking structure to ensure that the trolley chamber cannot be opened in the closed state. After the door panel is opened, the screw rod is automatically locked by the self-locking structure to ensure that the trolley cannot be moved when the door panel is open. If the trolley needs to be repaired, the screw rod can be removed. After the door panel is closed, the two door panels are closed to form a complete runway-shaped cavity. At this time, shaking the two hand wheels at the same time can realize the rotation of the chain in the runway-shaped cavity. This process is different from the conventional chain movement method. Multiple chain blocks fill the entire runway-shaped cavity. The chain blocks engaged with the handwheel drive can realize the rear chain blocks pushing the front chain blocks to form a linkage effect. The two hand wheels can be turned at the same time to easily rotate. If only one hand wheel is turned, the resistance to rotating the chain is very large, ensuring that the trolley can be easily pushed to move only when the two door panels are closed and the two handles are turned at the same time to avoid misoperation. When the chain block spans across two channels, it can also assist in connecting the two door panels.

Claims

1. A voltage transformer switch cabinet for a power transmission system, characterized in that: The cabinet comprises a trolley room, a trolley is arranged in the trolley room, a screw rod is arranged in the bottom of the trolley room through a shaft seat, a threaded block matched with the screw rod thread is arranged at the bottom of the trolley room, a door is arranged at the opening of the trolley room, the door comprises two symmetrically arranged door panels, the side of the door panels is hingedly connected to the cabinet, circular grooves are arranged at the same height of the two door panels, horizontal channels are arranged 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 channels at the same height are opposite to each other. The two sprockets 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 block is a long magnet with two magnetic poles at both ends of the chain block. 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 can be connected to the corresponding outer end of the lead screw through a clamping structure.

2. A voltage transformer switch cabinet for a power transmission system as claimed in claim 1, characterized in that : Both ends of the chain block are spherical.

3. A voltage transformer switch cabinet for a power transmission system as claimed in claim 1, characterized in that : The chain block has a tooth groove on the side facing the sprocket that meshes with the teeth of the sprocket.

4. A voltage transformer switch cabinet for a power transmission system as claimed in claim 1, characterized in that : An interlocking structure is arranged between the door panel and the trolley chamber, and the interlocking structure comprises a locking rod, the inner end of the locking rod is hingedly connected to the bottom of the trolley chamber, a hook is arranged at the outer end of the locking rod, a slot is arranged at the position of the door panel corresponding to the hook, and 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 engaged in the slot to lock the door panel from the inside, and the door panel cannot be opened. An unlocking rod is arranged 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 at this time.

5. A voltage transformer switch cabinet 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 facing the door panel, and a card block cooperating with the card hook is provided in the card slot.

6. A voltage transformer switch cabinet for a power transmission system as claimed in claim 1, characterized in that : 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, 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 on the top of the horizontal tube, a vertical rod which 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 inclined upward, the lower end of the vertical rod is an arc surface, and 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 inner side of the door panel corresponding to the outer end of the horizontal tube.

7. A voltage transformer switch cabinet for a power transmission system as claimed in claim 6, 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.

8. A voltage transformer switch cabinet for a power transmission system as claimed in claim 1, characterized in that : The clamping structure includes a plurality of grooves at the outer end of the screw rod and a protrusion at the inner end of the central shaft. When the door panel is closed, the protrusion docks with the corresponding grooves.

9. A voltage transformer switch cabinet for a power transmission system as claimed in claim 6, 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.

10. A voltage transformer switch cabinet for a power transmission system as claimed in claim 1, characterized in that The cabinet is provided with a busbar room, a cable room and an instrument room. 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 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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