Five-protection interlocking mechanism for switch cabinet

Abstract

The present invention relates to a five-protection interlocking mechanism for a switch cabinet, wherein a connecting plate is arranged on a locking shaft, the connecting plate is linked with a main shaft of a circuit breaker, a disconnecting latch is arranged at an intersection position of the locking shaft with an isolating locking rod, a disconnecting block is arranged on the isolating locking rod corresponding to the disconnecting latch, a driving wheel plate and an isolating locking plate are arranged at both ends of the isolating locking rod, a grounding locking plate and a cam plate are arranged at both ends of the locking push rod, an isolating shaft and a grounding shaft are arranged in parallel on both sides of the locking shaft, the isolating locking plate and the cam plate are sleeved on the isolating shaft and rotate coaxially, the driving wheel plate and the grounding locking plate are sleeved on the grounding shaft and rotate coaxially, the isolating shaft is linked with an isolating knife, the grounding shaft is linked with the grounding knife, a piston is arranged on the driving wheel plate, one end of the piston is linked with the closing latch of the circuit breaker, and an operation sequence of interconnection and interlocking is performed with the closing of the locked circuit breaker as the center by collecting the opening and closing positions of the main shaft of the circuit breaker.

Description

Technical Field

[0001] The invention relates to a five-protection interlocking mechanism for a switch cabinet. Background Art

[0002] The main function of the switchgear is to open and close, control and protect electrical equipment during the power generation, transmission, distribution and energy conversion process of the power system. The components in the switchgear mainly include vacuum circuit breakers, disconnectors and earthing switches. In order to achieve the five protections of the switchgear, it is necessary to set up five-protection interlocking mechanisms between the components.

[0003] The five-protection interlocking mechanism of the existing five-protection interlocking switch cabinet usually adopts a linkage method to ensure that the vacuum circuit breaker can be disconnected at the same time as the isolating switch and the earthing switch. When the isolating switch is energized, the five-protection interlocking mechanism will disconnect the vacuum circuit breaker at the same time. It cannot prevent the occurrence of misoperation, but can only reduce the consequences of misoperation, and there are certain safety hazards. In order to ensure that the five-protection interlocking mechanism can disconnect the vacuum circuit breaker in time, the five-protection interlocking mechanism is usually linked with the opening lock of the vacuum circuit breaker. The five-protection interlocking mechanism can only be operated after the circuit breaker is opened. However, under this connection method, the circuit breaker opening position signal is only uploaded through the electrical switch point. When the circuit breaker closing electrical control circuit is disconnected and other equipment in the cabinet is operated, the circuit breaker can still be closed, but it will be disconnected immediately after closing. There are certain safety hazards in the operation process. Moreover, the existing five-protection interlocking mechanisms are scattered at the circuit breaker, isolating switch and earthing switch, which makes the switch cabinet structure complicated and inconvenient to install. Summary of the invention

[0004] In view of the above-mentioned shortcomings, the present invention provides a five-protection interlocking mechanism for a switch cabinet which is integrated with a circuit breaker operating mechanism. The five-protection interlocking mechanism collects the opening and closing positions of the circuit breaker main shaft and performs an interconnected and interlocking operation sequence centered on locking the circuit breaker closing. The five-protection interlocking mechanism has the advantages of high safety, compact structure, and easy installation.

[0005] In order to achieve the above purpose, the present invention adopts a five-defense interlocking mechanism for a switch cabinet, including a chassis, a door closing shaft, a locking shaft, an isolation locking rod, and a locking push rod. The door closing shaft, the isolation locking rod, and the locking push rod are arranged in parallel in the chassis, and the locking shaft, the door closing shaft, the isolation locking rod, and the locking push rod are arranged perpendicular to each other in the chassis. A connecting plate is arranged on the locking shaft, and the connecting plate is linked to the main shaft of the circuit breaker. A disconnecting latch is arranged at the intersection of the locking shaft and the isolation locking rod, and a disconnecting block is arranged on the isolation locking rod corresponding to the disconnecting latch. A driving wheel plate and an isolation locking plate are respectively arranged at both ends of the isolation locking rod, and a grounding locking plate and a grounding locking plate are respectively arranged at both ends of the locking push rod. Cam plate, isolation shaft and grounding shaft are arranged in parallel on both sides of the locking shaft, the isolation locking plate and the cam plate are sleeved on the isolation shaft and rotate coaxially, the driving wheel plate and the grounding locking plate are sleeved on the grounding shaft and rotate coaxially, the isolation shaft is linked to the isolation knife, the grounding shaft is linked to the grounding knife, a plurality of locking grooves matching the isolation locking rod and the locking push rod are formed on the outer periphery of the isolation locking plate and the grounding locking plate respectively, a piston is arranged on the driving wheel plate, one end of the piston is linked to the closing latch of the circuit breaker, a reset spring is sleeved on the isolation locking rod to pull the isolation locking rod toward the driving wheel plate, and a reset spring is sleeved on the locking push rod to pull the locking push rod toward the cam plate.

[0006] The present invention further states that the door closing shaft is arranged outside one end of the locking shaft, the door closing shaft and the locking shaft are meshed and linked through bevel gears, and a door locking plate is arranged on the door closing shaft.

[0007] The present invention further states that four locking grooves are arranged on both the isolation locking plate and the grounding locking plate, and the four locking grooves are arranged at equal angles of 90°.

[0008] The present invention further states that the isolation shaft and the grounding shaft are both hexagonal shafts, and the centers of the driving wheel plate, the cam plate, the isolation locking plate and the grounding locking plate correspond to the hexagonal shafts to form hexagonal holes.

[0009] The present invention further states that a clearance groove for the locking shaft to pass through is formed on the isolation locking rod and the locking push rod.

[0010] The present invention is further configured such that the opening brake block is an opening brake bearing connected to the isolation locking rod.

[0011] The beneficial effects of the present invention are that cam plates and locking plates are arranged on both the isolating rotating shaft and the grounding rotating shaft, and cam plates and locking plates are respectively adopted at both ends of the isolating locking rod and the locking push rod to realize pushing and locking of the rotating shaft, the coaxially arranged cam plates and locking plates can restrain each other to realize interlocking, the structure is simple and the operation is convenient; the locking rotating shaft transmits the state of the circuit breaker main shaft to the closing rotating shaft and the isolating locking rod to realize locking of the cabinet door and the isolating switch; a piston is arranged on the driving wheel of the grounding rotating shaft to link with the circuit breaker closing latch to realize interlocking, so as to prevent the circuit breaker from being closed in the closed state of the grounding switch.

[0012] The present invention collects the opening and closing positions of the circuit breaker main shaft and performs an interlocking operation sequence centered on locking the circuit breaker closing. That is, the circuit breaker closing position interlocking mechanism mechanically locks the isolating knife switch and the operating shaft of the earthing switch and synchronously locks the operating door of the five-protection interlocking mechanism to effectively prevent misoperation. When the circuit breaker is in the open position, the mechanism operating door is unlocked, and when the earthing switch is operated, the circuit breaker closing latch is synchronously locked, the isolating knife switch shaft is locked, and the circuit breaker is prevented from closing the isolating knife switch when the earthing knife is in the closed position. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a specific embodiment of the present invention.

[0014] Figure 2 It is a schematic diagram of the cooperation of the isolation locking rod according to a specific embodiment of the present invention.

[0015] Figure 3 It is a schematic diagram of the locking push rod matching of a specific embodiment of the present invention.

[0016] Figure 4 It is an assembly side view of a specific embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 1-Figure 4As shown, a specific embodiment of the present invention is a five-defense interlocking mechanism for a switch cabinet, comprising a chassis 1, a door closing shaft 2, a locking shaft 3, an isolation locking rod 4, and a locking push rod 5. The door closing shaft 2, the isolation locking rod 4, and the locking push rod 5 are arranged in parallel in the chassis 1, and the locking shaft 3 and the door closing shaft 2, the isolation locking rod 4, and the locking push rod 5 are arranged perpendicular to each other in the chassis 1. A connecting plate 31 is arranged on the locking shaft 3, and the connecting plate 31 is linked to the main shaft 10 of the circuit breaker. A gate-opening latch 32 is arranged at the intersection with the isolation lock rod 4, and a gate-opening bearing 41 is arranged on the isolation lock rod 4 corresponding to the gate-opening latch 32. A driving wheel plate 42 and an isolation locking plate 43 are arranged at both ends of the isolation lock rod 4, and a grounding locking plate 51 and a cam plate 52 are arranged at both ends of the locking push rod 5. An isolation rotating shaft 6 and a grounding rotating shaft 7 are arranged in parallel on both sides of the locking shaft 3. The isolation locking plate 43 and the cam plate 52 are sleeved on the isolation rotating shaft 6 and rotate coaxially. The driving wheel plate 42 and the grounding locking plate 51 are sleeved on the grounding rotating shaft 7 and rotate coaxially, the isolation rotating shaft 6 is linked to the isolation knife, the grounding rotating shaft 7 is linked to the grounding knife, the isolation locking plate 43 and the grounding locking plate 51 are both provided with four locking grooves 44 that cooperate with the isolation locking rod 4 and the locking push rod 5 on the outer periphery, and the four locking grooves are arranged at equal angles of 90°, a piston 8 is provided on the driving wheel plate 42, the piston 8 is sleeved in the piston sleeve 81 and moves up and down, and one end of the piston 8 is linked to the circuit breaker closing latch Then, a return spring 9 is sleeved on the isolation lock rod 4 to pull the isolation lock rod 4 toward the driving wheel plate 42, and a return spring is sleeved on the locking push rod 5 to pull the locking push rod 5 toward the cam plate 52. The door closing shaft 2 is arranged outside one end of the locking shaft 3. The door closing shaft 2 and the locking shaft 3 are meshed and linked through bevel gears. A door locking plate 21 is arranged on the door closing shaft 2. The door locking plate 21 cooperates with the door lock to achieve locking. A clearance groove 45 is formed on the isolation lock rod 4 and the locking push rod 5 for the locking shaft 3 to pass through.

[0019] The isolation rotating shaft 6 and the grounding rotating shaft 7 are both hexagonal shafts, and the centers of the driving wheel plate 42, the cam plate 52, the isolation locking plate 43 and the grounding locking plate 51 correspond to the hexagonal shafts to form hexagonal holes.

[0020] In addition to the above-mentioned structures, the isolation locking plate and the grounding locking plate of the present invention may also adopt disc-shaped structures such as gears that can achieve lateral locking.

[0021] The above specific embodiments are preferred embodiments of the present invention. In addition to the above embodiments, other obvious changes of the present invention, such as the hexagonal axis of the isolation shaft and the grounding shaft can be changed to any special-shaped axis, are also within the protection scope of the present invention.

Claims

1. A five-protection interlocking mechanism for a switch cabinet, characterized in that: The five-defense interlocking mechanism includes a chassis, a door closing shaft, a locking shaft, an isolation locking rod, and a locking push rod. The door closing shaft, the isolation locking rod, and the locking push rod are arranged in parallel in the chassis. The locking shaft, the door closing shaft, the isolation locking rod, and the locking push rod are arranged perpendicularly to each other in the chassis. A connecting plate is arranged on the locking shaft, and the connecting plate is linked to the main shaft of the circuit breaker. A disconnecting latch is arranged at the intersection of the locking shaft and the isolation locking rod. A disconnecting block is arranged on the isolation locking rod corresponding to the disconnecting latch. A driving wheel plate and an isolation locking plate are respectively arranged at both ends of the isolation locking rod. A grounding locking plate and a cam plate are respectively arranged at both ends of the locking push rod. An isolation shaft and a grounding shaft are respectively arranged in parallel, the isolation locking plate and the cam plate are sleeved on the isolation shaft and rotate coaxially, the driving wheel plate and the grounding locking plate are sleeved on the grounding shaft and rotate coaxially, the isolation shaft is linked to the isolation knife, the grounding shaft is linked to the grounding knife, a plurality of locking grooves matching the isolation locking rod and the locking push rod are formed on the outer periphery of the isolation locking plate and the grounding locking plate, a piston is arranged on the driving wheel plate, one end of the piston is linked to the closing latch of the circuit breaker, a reset spring for pulling the isolation locking rod toward the driving wheel plate is sleeved on the isolation locking rod, and a reset spring for pulling the locking push rod toward the cam plate is sleeved on the locking push rod; The door closing shaft is arranged outside one end of the locking shaft, the door closing shaft and the locking shaft are meshed and linked through bevel gears, and a door locking plate is arranged on the door closing shaft.

2. The five-protection interlocking mechanism for a switch cabinet according to claim 1 is characterized in that: The isolation locking plate and the grounding locking plate are both provided with four locking grooves, and the four locking grooves are arranged at equal angles of 90°.

3. The five-protection interlocking mechanism for a switch cabinet according to claim 1 is characterized in that: The isolation rotating shaft and the grounding rotating shaft are both hexagonal shafts, and the centers of the driving wheel plate, the cam plate, the isolation locking plate and the grounding locking plate correspond to the hexagonal shafts to form hexagonal holes.

4. The five-protection interlocking mechanism for a switch cabinet according to claim 1 is characterized in that: The isolation locking rod and the locking push rod are formed with a clearance groove for the locking shaft to pass through.

5. The five-protection interlocking mechanism for a switch cabinet according to claim 1 is characterized in that: The opening block is an opening bearing connected to the isolation locking rod.

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