CN213341399U

CN213341399U - Automatic switch-on position lock for draw-out circuit breaker

Info

Publication number: CN213341399U
Application number: CN202021186220.5U
Authority: CN
Inventors: 潘斌华
Original assignee: Shanghai Xingte Electric Technology Center
Current assignee: Shanghai Liangcheng Electromechanical Technology Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-06-01
Anticipated expiration: 2030-06-24

Abstract

An automatic closing position lock for a drawout circuit breaker comprises a locking piece and a reset elastic piece. Before the circuit breaker body and the drawer seat are connected in place, the locking piece is located at a position where switching-on is forbidden under the action of self weight and reset force of the reset elastic piece, and a tripping rod of an operating mechanism on the circuit breaker body is limited at a tripping position, so that the circuit breaker can not be switched on. When the circuit breaker body is connected with the drawer seat in place, the locking piece overcomes the dead weight and the reset force of the reset elastic piece under the pushing of the working surface of the driving plate, moves upwards, leaves the trip rod, releases the locking of the switching-on function of the circuit breaker body and reaches the switching-on unlocking position. The position of the locking piece changes along with the position of the breaker body through the driving plate. Compared with the prior art, the device has fewer parts, more compact structure, simpler process, more reliable work and more convenient maintenance and disassembly; the locking and unlocking of the switching-on function of the operating mechanism are controlled directly by the driving plate for controlling the moving position of the breaker body, and the control precision is higher.

Description

Automatic switch-on position lock for draw-out circuit breaker

Technical Field

The invention belongs to the field of low-voltage electric appliances, and particularly relates to a draw-out type circuit breaker.

Background

In the draw-out circuit breaker, when the circuit breaker body does not reach the connection position of the drawer seat and is connected with the drawer seat in place, the operating mechanism is not allowed to be switched on, and therefore the purpose of personal safety protection is achieved.

Therefore, the circuit breaker body is generally pushed into or pulled out of the drawer base to have three positions, i.e., an isolation position, a test position, and a connection position. At the isolation position, the busbar of the circuit breaker body is separated from the electric connection device of the drawer seat, a certain isolation distance is provided, and the main circuit is cut off. At the same time, the control circuit of the circuit breaker is also separated from the secondary wiring loop. At the connection position, the busbar of the circuit breaker body is connected with the electric connection device of the drawer seat, the main circuit is in a connection state, and meanwhile, the control circuit and the application circuit are also in a connection state. The test position is located between the isolation position and the connection position, at the position, the busbar of the circuit breaker body is separated from the electric connection device of the drawer seat, and the control circuit and the secondary circuit are in a connection state. The main circuit should be cut off before the circuit breaker body reaches the on position from the off position.

The automatic switch-on position lock of the existing circuit breaker can realize whether the switch-on function of an operating mechanism on a circuit breaker body is locked or unlocked or not, and changes along with the position of the circuit breaker body, thereby ensuring that the circuit breaker body can be switched on only when being connected in place with a drawer seat. The prior art has complex structure and more transmission links, and the locking and unlocking are realized through intermediate transmission, thereby influencing the locking precision and sensitivity.

Disclosure of Invention

The invention aims to provide the automatic closing position lock for the draw-out circuit breaker, which has high locking precision and reliable locking.

In order to achieve the technical purpose, the invention designs a brand-new automatic closing position lock for a drawout breaker, which comprises a drawer seat, a locking piece, a driving plate, a reset elastic piece, a gear, a rotating shaft, a trip lever and a breaker body side plate.

The driving device on the drawer seat can drive the circuit breaker body to enter the drawer seat and realize electric connection or leave the drawer seat and realize isolation.

And the driving plate is rotatably arranged on the drawer seat. The driving plate is provided with a gear part which is meshed with the gear on the rotating shaft and is driven by the rotating shaft to rotate. The driving plate is provided with a driving groove, and the driving groove drives the breaker body to move by pushing the roller arranged on the side plate of the breaker body. The thrust direction of the driving groove to the roller is concentrated on pushing the circuit breaker body into the drawer seat, namely the component force of the thrust in the motion direction of the circuit breaker body is larger than the component force vertical to the motion direction of the circuit breaker body.

The locking member has a trip surface, a working surface, a hanging hole and a guide hole. And the tripping surface is in action coupling with the breaker body to realize the locking or unlocking of the switching-on function of the breaker body. The working surface is in driving relation with the drive plate. And the suspension hole is used for installing the reset elastic piece and providing reset force for the locking piece. And the guide post on the drawer seat penetrates through the guide hole, so that the locking piece can move along the direction of the guide hole.

The drawer seat is provided with a driving device, and the driving device comprises a rotating shaft and gears arranged on two sides of the rotating shaft. The gear takes the axis of the rotating shaft as a rotating center and rotates together with the rotating shaft, and the motion is transmitted to the driving plate through the gear part.

In addition, the circuit breaker body is a device with an operating mechanism for closing and opening the circuit breaker. The operating mechanism is also provided with a tripping mechanism for tripping the circuit breaker to cause the opening action under the conditions of fault current, emergency, maintenance state and the like, so that the tripping mechanism can be actuated by arranging a tripping rod.

Furthermore, the tripping surface of the locking piece is used for pushing the tripping rod to limit the operating mechanism on a tripping position, so that the circuit breaker can not be switched on. Be provided with the drive face on the locking piece, with the drive plate cooperation, realize the upward movement unblock of locking piece.

And the reset elastic piece is arranged on the locking piece and provides reset force in a locking state direction for enabling the locking piece to release the operating mechanism. When the circuit breaker body leaves the connecting position, reset force is provided to drive the locking piece to reset, and the locking of the closing function of the circuit breaker body operating mechanism is implemented.

When the circuit breaker body advances the draw-out type device, at first, the locking piece promotes circuit breaker body operating device trip bar and trips to the locking is in the dropout state, and the circuit breaker body can't close a floodgate. The circuit breaker body moves towards the draw-out device under the pushing of the driving plate, and after the working face on the driving plate touches the driving face of the locking piece, the locking piece starts to move upwards under the guiding of the guide post, so that the unlocking face on the locking piece gradually leaves the tripping rod of the circuit breaker body operating mechanism. And when the tripping surface of the locking piece leaves the tripping rod, the switching-on function of the operating mechanism of the circuit breaker body is unlocked.

When the circuit breaker body is pulled out of the draw-out device, the circuit breaker body moves in a direction away from the draw-out device under the pushing of the driving plate. Meanwhile, the working surface of the driving plate gradually moves towards the direction away from the driving surface of the locking piece, the locking piece moves downwards to reset under the action of the reset elastic piece or the self gravity, but the locking piece still leans against the working surface of the driving plate. When the working face of the driving plate leaves the driving face of the locking piece, the locking piece resets to the position. In this process, the trip surface of the blocking member comes progressively closer to the trip lever of the operating mechanism of the circuit breaker body. When the tripping surface of the locking piece touches the tripping rod, the tripping rod is gradually pushed to move towards the tripping direction, finally the tripping rod is tripped, the tripping rod is locked by the tripping surface of the locking piece, and the operating mechanism of the circuit breaker body cannot be switched on.

Compared with the prior art, the locking and unlocking device has the advantages that the locking and unlocking of the switching-on function of the operating mechanism of the circuit breaker body along with the position change of the circuit breaker body are realized by the aid of the locking piece, the structure is more compact, the processing technology is simpler, the work is more reliable, and the maintenance and the disassembly are more convenient.

The control device has the beneficial effects that the locking and unlocking of the switching-on function of the operating mechanism are controlled directly by the driving plate for controlling the moving position of the breaker body, so that the control precision is higher, and the control device is safer and more reliable.

Drawings

FIG. 1 is a schematic diagram of an unlocking state of an automatic lock for a closing position of a draw-out circuit breaker according to the present invention

FIG. 2 is a schematic structural diagram of the locking state of the automatic closing position lock for the drawout breaker according to the present invention

FIG. 3 is a schematic structural diagram of the locking member of the present invention

FIG. 4 is a schematic structural diagram of the driving plate of the present invention

Detailed Description

According to fig. 1 and 2, the utility model relates to a close floodgate position automatic lock for pull-out type circuit breaker, including circuit breaker body, drawer seat 1, locking piece 2, elastic component 3, drive plate 6, gear 7, pivot 8, trip bar 9, circuit breaker body curb plate 10 reset.

The circuit breaker comprises a drawer seat 1, which can also be called a drawout device, wherein a circuit breaker body can be operated by a driving device on the drawer seat 1 so as to enter the drawer seat 1 and realize electric connection; or operated by the driving means away from the drawer seat 1 and electrically isolated. The circuit breaker body curb plate is generally installed in both sides to the circuit breaker body, like the utility model discloses circuit breaker body curb plate 10 in the drawing, except the rigidity that increases the circuit breaker body, still take place the transmission of action through some structural feature of self and drawer seat 1, for example in fig. 1, have first roller 501 and second roller 502 and drawer seat 1 formation action coupling on the circuit breaker body curb plate 10.

According to fig. 1, 2 and 3, the locking element 2 has a tripping surface 201, a first working surface 202, a second working surface 203, a guide bore 204 and a suspension bore 205. The tripping surface 201 is used for generating action coupling relation with the breaker body. The first working surface 202 and the second working surface 203 are in driving transmission relationship with the drive plate 6. The trip surface 201 and the first and

second working surfaces

202 and 203 are located at both ends of the locking member 2. The hanging hole 205 is formed at one end of the trip surface 201 for receiving the return spring 3 to provide a return force to the latching member 2. The guiding hole 204, which may be one or more, may be oriented perpendicular to or at an angle to the moving direction of the circuit breaker body, the guiding hole 204 is matched with the guiding post 4 on the drawer base 1, and the guiding post 4 passes through the guiding hole, so that the locking member 2 can move along the guiding hole 204.

According to fig. 1, 2 and 4, the driving plate 6 has a mounting hole 603, and the driving plate 6 is rotatably mounted on the drawer base 1 through the mounting hole 603. The outline of the driving plate 6 may be a gear portion or a partial gear portion, and the utility model adopts a partial gear portion 604 in view of economy. The gear portion 604 meshes with a gear 7 fixed to the rotary shaft 8. The driving device on the drawer seat 1 operates to rotate the rotating shaft 8, and the driving plate 6 is driven to rotate through the gear 7. The drive plate 6 also has first and

second push surfaces

601 and 602 which drive the first and

second working surfaces

202 and 203 of the latch lever 2 so that the drive plate 6 is in driving relationship with the latch member 2.

The driving plate 6 is provided with two driving grooves, the first driving groove is composed of a first driving groove bottom edge 6071, a locking surface 6053, a third driving surface 6062 and transition circular arc surfaces which are arranged between the first driving groove bottom edge 6071 and the third driving groove 6062, and one end of the first driving groove is open. The first roller 501, which can enter the first driving groove through one end of the opening, is pushed by the driving plate 6. The second driving groove is composed of a second driving groove bottom side 6072, a first driving surface 6051, a second driving surface 6061 and transition arc surfaces therebetween, and one end of the second driving groove is open. The second roller 502, which can enter the second driving groove through one end of the opening, is pushed by the driving plate 6. First drive slot bottom edge 6071, second drive slot bottom edge 6072, and stop surface 6052 are concentric with mounting hole 603. First drive slot bottom edge 6071 and second drive slot bottom edge 6072 have the same radius and stop surface 6052 has a radius that is greater than the radius of first drive slot bottom edge 6071 and second drive slot bottom edge 6072. The radian design of the first driving groove bottom edge 6071, the second driving groove bottom edge 6072 and the stopping surface 6052 on the driving plate 6 ensures that the matching angle of the driving plate 6 with the first roller 501 and the second roller 502 is less than 45 degrees, and the vertical direction component of the pushing force is controlled within a small range.

According to the above analysis, when the circuit breaker body is pushed into the drawer base 1 by the driving plate 6, the roller 502 is pushed by the first driving surface 6051 until the roller 502 leaves the first driving surface 6051 and starts to contact with the stopping surface 6052, in this process, the driving plate 6 does not drive the locking member 2, and the locking member 2 maintains the locking state of the closing function under the action of the self-gravity and the elastic return member 3. When the roller 502 comes into contact with the stop surface 6052, the circuit breaker body reaches the connected position. Thereafter, the first pushing surface 601 of the driving plate 6 contacts with the first working surface 202 of the locking member 2 first, the locking member 2 is pushed to move along the guiding hole 204 with the guiding function, the trip surface 201 on the locking member 2 gradually separates from the trip rod 9 on the circuit breaker body until the first pushing surface 601 separates from the first working surface 202, the second pushing surface 602 contacts with the second working surface 203, the trip surface 201 on the locking member 2 separates from the trip rod 9 on the circuit breaker body, and the locking state of the closing function is released.

The breaker body is provided with an operating mechanism which is used for switching on and switching off the breaker, wherein the operating mechanism is also provided with a tripping mechanism which is used for executing the tripping action of the breaker caused by tripping under the conditions of fault current, emergency, maintenance state and the like, so that the tripping mechanism can be actuated by arranging a driving piece, such as a tripping rod 9 in figure 1, and the tripping mechanism is actuated by the driving of a locking piece 2.

It should be further noted that the first roller 501 and the second roller 502 mounted on the circuit breaker body side plate 10 have a protruding height greater than the thickness of the driving plate 6 at the circuit breaker body side plate 10, and are located corresponding to the locking member 2, and can move in the driving grooves corresponding to the driving plate 6.

According to fig. 3, the tripping surface 201 of the locking member 2 is used to push the tripping lever 9 to limit the operating mechanism to the tripping position, ensuring that the circuit breaker cannot be closed. The locking member 2 is provided with a first working surface 202 and a second working surface 203, and the first working surface and the second working surface are matched with the driving plate 6 to realize the upward movement unlocking of the locking member 2. The elastic return element 5 has one end mounted on the hanging hole 205 of the latch 2 and the other end mounted on the fixed part of the drawer base 1, so as to provide the return force of the latch 2, the direction of which is such as to cause the latch 2 to assume the locked state in which the operating mechanism is released.

It should be further noted that when the circuit breaker body is pulled out of the drawer base 1, the circuit breaker is initially in the on position with the drawer base 1. Under the action of a driving device of the drawer seat 1, the rotating shaft 8 drives the gear 7 to rotate clockwise, the driving plate 6 also rotates anticlockwise, and the circuit breaker body is driven by the driving plate 6 to move in the direction away from the draw-out device. At the same time, the second pushing surface 602 of the driving plate 6 is separated from the second working surface 203 of the latch member 2, and then the first pushing surface 601 of the driving plate 6 is in contact with the first working surface 202 of the latch member 2 and moves in a direction away from the latch member 2. The locking member 2 moves downward by the return elastic member 5 or its own weight. When the locking member 2 is reset to the proper position, the first pushing surface 601 on the driving plate 6 is away from the first working surface 202 of the locking member 2, and the circuit breaker body reaches the testing position. In this process, the trip surface 201 of the lockout member 2 progressively approaches the circuit breaker body operating mechanism trip lever 9. When the trip surface 201 of the locking piece 2 touches the trip rod 9, the trip rod 9 is gradually pushed to move towards the trip direction, finally the trip rod 9 is tripped, the trip rod 9 is locked by the trip surface 201 of the locking piece 2, and the operating mechanism of the circuit breaker body cannot be switched on.

Furthermore, the reset force provided by the reset elastic element 5 should be larger than the tripping force of the tripping rod 9 of the circuit breaker body operating mechanism, and the stroke of the locking element 2 should be larger than the tripping stroke of the tripping rod 9 of the circuit breaker body operating mechanism, so as to ensure that the locking element 2 can reliably push the tripping rod 9 of the circuit breaker body operating mechanism to trip when the switching-on function is locked.

While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. A closing position automatic lock for a drawout breaker comprises a breaker body, a drawer seat (1), a locking piece (2), a driving plate (6), a gear (7), a rotating shaft (8), a trip bar (9) and a breaker body side plate (10);

the circuit breaker body is pushed into or pulled out of the drawer seat (1) by the drawer seat (1);

the circuit breaker body comprises a tripping rod (9) for tripping and opening the circuit breaker and a circuit breaker body side plate (10);

the rotating shaft (8) and the gear (7) are arranged on the drawer seat (1), the gear (7) takes the axis of the rotating shaft (8) as a rotating center and rotates together with the rotating shaft (8), and the driving plate (6) is rotatably arranged on the drawer seat (1) and is provided with a gear part (604);

the drawer seat (1) drives the driving plate (6) through a gear (7), and is characterized by further comprising a locking piece (2) which can drive a tripping rod (9) to enable the breaker body to trip and open;

the driving plate (6) is also provided with a first pushing surface (601) and a second pushing surface (602), and the driving plate can drive the locking piece (2) to separate from the trip rod (9) to release the locking of the breaker body.

2. The automatic lock for closing position of drawout breaker according to claim 1, further comprising on said driving plate (6)

A first driving groove surrounded by a locking surface (6053), a first driving groove bottom edge (6071), a third driving surface (6062) and a transition arc surface therebetween;

a second driving groove surrounded by a first driving surface (6051), a second driving groove bottom edge (6072), a second driving surface (6061) and a transition arc surface therebetween;

and a stop surface (6052) between the first drive slot and the second drive slot;

the driving plate (6) pushes a first roller (501) and a second roller (502) on a side plate (10) of the circuit breaker body through a first driving groove and a second driving groove, so that the circuit breaker body is driven to be pushed in or pulled out of the drawer seat (1).

3. The automatic lock for the closing position of the drawout breaker according to claim 1, wherein the locking member (2) has a trip surface (201) and a first working surface (202) and a second working surface (203);

a first pushing surface (601) on the driving plate (6) pushes a first working surface (202) on the locking piece (2), and after the locking piece (2) moves, the unlocking surface (201) is separated from the tripping rod (9), so that the locking state is released.

4. The automatic lock for the closing position of the drawout breaker according to claim 3, wherein the locking member (2) further has a hanging hole (205), one end of the return elastic member (3) is installed in the hanging hole (205), and the other end is installed on the drawer base (1), providing the return force to the locking member (2) to keep the trip bar (9) at the trip position;

the locking piece (2) is also provided with a guide hole (204) which is matched with the guide post (4) on the drawer seat (1), so that the locking piece (2) can move along the direction of the guide hole (204).

5. The automatic closing position lock for the drawout breaker according to claim 4, wherein the guiding stroke of the locking member (2) is larger than the tripping stroke of the breaker body operating mechanism trip bar (9), and the moving stroke of the second pushing surface (602) on the driving plate (6) for pushing the locking member (2) is larger than the tripping stroke of the breaker body operating mechanism trip bar (9).