Device for adjusting the tripping and closing coil stroke of a circuit breaker and circuit breaker using the device

Abstract

The application relates to a device for adjusting the stroke of a closing and opening coil of a circuit breaker and the circuit breaker adopting the device, wherein the device for adjusting the stroke of the closing and opening coil comprises a mounting plate (1) fixed in the circuit breaker, an adjusting plate (2) for bearing the closing and opening coil (9) of the circuit breaker, and the adjusting plate (2) is connected to the mounting plate (1) and the relative position of the mounting plate (1) and the adjusting plate (2) in the movement direction of a coil moving iron core (10) of the closing and opening coil (9) is adjustable. Compared with the prior art, the front and back distance of the closing and opening coil is adjusted by adjusting the position of the mounting plate, so that the stroke of the closing and opening coil moving iron core is in a reasonable range, and the circuit breaker can be reliably closed and opened under different voltages required by the technical requirements of the circuit breaker.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker, in particular to a device for adjusting the stroke of the opening and closing coil of a circuit breaker and a circuit breaker using the device. BACKGROUND

[0002] Among power protection devices, the alternating current high-voltage vacuum circuit breaker is the most commonly used three-phase alternating current indoor high-voltage vacuum switch device. The operating mechanism of the vacuum circuit breaker is used to realize the opening and closing operation of the vacuum circuit breaker, and is an important component of the vacuum circuit breaker. The opening and closing coil is a common component for opening and closing the circuit breaker. The opening and closing coil generates a magnetic field when energized, and the moving iron core moves under the action of the magnetic force, pushing the bent plate to rotate and making the circuit breaker open and close.

[0003] In the current design of indoor vacuum circuit breakers, the opening and closing coil is directly fixed on the mounting plate, and its installation position cannot be adjusted. As shown in Figure 1 When the stroke of the moving iron core of the opening and closing coil is not enough to push the bent plate to rotate by a sufficient angle, the circuit breaker cannot normally open and close. Chinese patent CN205016451U discloses a vacuum circuit breaker closing coil device, which comprises a cabinet, a closing coil, a closing top plate, a closing mounting plate, a transmission mechanism and an energy storage motor. The cabinet is provided with a panel at the back, and a cavity is formed in the cabinet. The closing mounting plate is fixed to the upper part of the cavity of the cabinet and closely attached to the panel. The closing coil is fixed to the closing mounting plate, and the closing coil includes an armature, which is inclined downward and points to the closing top plate. The closing top plate and the transmission mechanism are fixed to the middle part of the cavity of the cabinet, and the energy storage motor is fixed to the bottom part of the cavity of the cabinet. The technical solution of the patent has the above-mentioned defects. SUMMARY

[0004] The present application is to overcome the defects of the prior art and provide a device for adjusting the stroke of the opening and closing coil and a circuit breaker using the device.

[0005] The object of the present application can be achieved by the following technical solutions:

[0006] A device for adjusting the stroke of the opening and closing coil of a circuit breaker, comprising:

[0007] a mounting plate fixed in the circuit breaker,

[0008] an adjusting plate for bearing the opening and closing coil of the circuit breaker, the adjusting plate being connected to the mounting plate and being adjustable in the relative position with the mounting plate in the direction of the movement of the coil moving iron core of the opening and closing coil.

[0009] Preferably, the adjusting plate and the mounting plate are arranged in a stacked manner, and are connected by a position adjusting mechanism and a limiting mechanism to realize the adjustment of the relative position in the direction of the movement of the coil moving iron core of the opening and closing coil.

[0010] Preferably, the position adjusting mechanism comprises two baffle plates provided on the adjusting plate and the mounting plate respectively and having a circular hole, and a fastener penetrating the circular holes of the two baffle plates, the circular holes of the two baffle plates are sequentially arranged along the movement direction of the coil moving iron core of the on-off coil, and the relative position of the adjusting plate and the mounting plate along the movement direction of the coil moving iron core of the on-off coil is adjusted by arranging a gasket between the two baffle plates.

[0011] The relative position of the adjusting plate and the mounting plate along the movement direction of the coil moving iron core of the on-off coil can be adjusted by arranging different numbers of gaskets or arranging gaskets with different thicknesses.

[0012] Preferably, the limiting mechanism comprises a hollow clamping groove arranged on the mounting plate and a clasp arranged on the adjusting plate, the clasp is composed of a connecting L-shaped limiting plate and a buckling plate, the limiting plate is arranged on the side of the adjusting plate in contact with the mounting plate and located in the hollow clamping groove, and the buckling plate penetrates the hollow clamping groove and is buckled on the mounting plate.

[0013] Preferably, the position adjusting mechanism and the limiting mechanism are arranged at the two ends of the adjusting plate and the mounting plate which are stacked and arranged along the movement direction of the coil moving iron core of the on-off coil.

[0014] A circuit breaker adopting the device for adjusting the on-off stroke of the on-off coil, comprising a shell and an on-off device and a closing holding device arranged in the shell, the on-off device comprises an on-off coil, the on-off coil is arranged in the shell through the device for adjusting the on-off stroke of the on-off coil, the on-off coil is provided with an on-off button and a coil moving iron core, and the closing holding device has a bent plate matched with the on-off coil.

[0015] The original fixed position of the on-off coil is improved, the front-back distance of the on-off coil is adjusted by changing the relative position of the adjusting plate and the mounting plate, the stroke of the coil moving iron core of the on-off coil is in a reasonable range, and the circuit breaker can reliably on-off under different voltages required by the technical requirements of the circuit breaker.

[0016] The limiting mechanism composed of the clasp and the hollow clamping groove enables the adjusting plate and the mounting plate to have a certain free movement distance in the front-back direction (the movement direction of the coil moving iron core of the on-off coil) during assembly, cooperates with the position adjusting mechanism, and also plays a limiting role, the adjusting plate and the mounting plate are connected through the fastener (such as a bolt) penetrating the circular hole, and the on-off coil is fixed on the adjusting plate, when the stroke of the coil moving iron core of the on-off coil is insufficient, the front-back distance of the adjusting plate is adjusted by appropriately increasing the gasket between the mounting holes, so that the coil moving iron core can push the bent plate to rotate by a sufficient angle, the circuit breaker can reliably on-off, and the device for adjusting the on-off stroke of the on-off coil can also ensure that the circuit breaker can reliably on-off under low voltage.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The circuit breaker structure requires little modification, and the existing vacuum circuit breaker can be easily improved, thereby improving the applicability of the present invention.

[0019] (2) Reliable structure. Through the specially designed position adjustment mechanism and limit mechanism, the reliable connection between the adjustment plate and the mounting plate is achieved, and at the same time, the relative position adjustment of the adjustment plate and the mounting plate in the movement direction of the coil moving iron core of the opening and closing coil is guaranteed.

[0020] (3) Ensure that the circuit breaker can be opened and closed reliably under different voltage conditions specified in the technical requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the installation of the opening and closing coil in the prior art;

[0022] Figure 2 This is a schematic diagram of an exploded view of an adjustment plate and a mounting plate in a device capable of adjusting the stroke of an opening and closing coil according to the present invention;

[0023] Figure 3 This is a schematic structural diagram of a device capable of adjusting the stroke of a closing and opening coil according to the present invention;

[0024] Figure 4 This is a schematic diagram of the installation of the opening and closing coils in the present invention;

[0025] Figure 5 The figure is a schematic diagram of a circuit breaker using the device for adjusting the stroke of the opening and closing coils of the present invention.

[0026] In the figure, 1 is the mounting plate, 2 is the adjustment plate, 3 is the baffle, 4 is the round hole, 5 is the hollow slot, 6 is the buckle, 61 is the L-shaped limit plate, 62 is the buckle plate, 7 is the gasket, 8 is the manual tripping button, 9 is the opening and closing coil, 10 is the coil moving iron core, 11 is the needle bearing, 12 is the tripping latch device, 13 is the bent plate, 14 is the connecting plate one, 15 is the closing holding latch, 16 is the main shaft, 17 is the crank arm, 18 is the oil buffer piston, 19 is the connecting plate two, 20 is the transmission crank arm, 21 is the tripping spring, 22 is the pin, 23 is the insulating pull rod device, 24 is the arc extinguishing chamber, and 25 is the casing. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] A device capable of adjusting the stroke of a closing and opening coil, used for a circuit breaker, comprising:

[0030] Mounting plate 1, fixed inside the circuit breaker,

[0031] Adjustment plate 2, used to carry the opening and closing coil 9 of the circuit breaker (such as Figures 2 to 4 As shown, Figure 4 The one closer to the observer is the opening coil, and the one farther away from the observer is the closing coil, and the two are arranged side by side). The adjustment plate 2 is connected to the mounting plate 1, and its relative position with the mounting plate 1 in the movement direction of the coil moving iron core 10 of the opening and closing coil 9 can be adjusted.

[0032] In this embodiment, the adjustment plate 2 and the mounting plate 1 are arranged in a stacked manner, and the two are connected by a position adjustment mechanism and a limit mechanism to achieve adjustment of the relative position of the coil moving iron core 10 of the opening and closing coil 9 in the direction of movement. Specifically: the position adjustment mechanism includes a baffle 3 with a circular hole 4, which is respectively arranged on the adjustment plate 2 and the mounting plate 1, and a fastener 6 passing through the circular holes 4 of the two baffles 3. The circular holes 4 on the two baffles 3 are arranged in sequence along the direction of movement of the coil moving iron core 10 of the opening and closing coil 9. The relative position of the adjustment plate 2 and the mounting plate 1 in the direction of movement of the coil moving iron core 10 of the opening and closing coil 9 is adjusted by arranging gaskets 7 (of different numbers or different thicknesses) between the two baffles 3. The limiting mechanism includes two sets of hollow slots 5 provided on the mounting plate 1 and a buckle 6 provided on the adjustment plate 2. The buckle 6 consists of an L-shaped limiting plate 61 and a snap plate 62. The limiting plate 61 is provided on the side of the adjustment plate 2 that contacts the mounting plate 1 and is located in the hollow slots 5. The snap plate 62 passes through the hollow slots 5 and is snapped onto the mounting plate 1. The position adjustment mechanism and limiting mechanism are located at opposite ends of the stacked adjustment plate 2 and mounting plate 1, in the direction of motion of the moving iron core 10 of the opening and closing coil 9.

[0033] Circuit breakers with adjustable trip coils, such as Figure 5 As shown, it includes a casing 25 and an opening and closing device and a closing holding device arranged in the casing 25. The opening and closing device includes an opening and closing coil 9. The opening and closing coil 9 is arranged in the casing 25 through a device that can adjust the opening and closing coil stroke. The opening and closing coil 9 is provided with an opening and closing button 8 and a coil moving iron core 10. The closing holding device has a bent plate 13 that is matched with the opening and closing coil 9.

[0034] The closing latch 15 of the circuit breaker is tangent to the needle bearing 11 on the opening latch device 12. The needle bearing 11 presses against the closing latch 15, and the closing latch 15 is in a locked state. The front end of the transmission crank arm 20 is lifted until the moving contact in the arc extinguishing chamber 24 is pressed against the static contact. The lower end of the transmission crank arm 20 passes through the pin 22 and is connected by a connecting plate 19 to ensure its synchronization. The two opening springs 21 respectively hook the two ends of the outermost phase pin 22. At this time, the opening spring 21 is in a stretched state and the circuit breaker is in a closed state (such as Figure 4When the manual opening button 1 is pressed or the release is started, the opening process begins, the opening coil 9 is attracted, the coil moving iron core 10 pushes the bent plate 13 to rotate, the connecting plate 14 drives the release half shaft to rotate, the closing holding catch 15 is unlocked, the transmission crank 20 rotates clockwise around the shaft, the contact spring in the insulation pull rod device 23 and the energy stored by the opening spring 21 make the moving contact in the arc extinguishing chamber 24 separate downward at a certain speed, and move to the opening position, at this time the energy of the opening spring 21 is released back to the free state, the transmission crank 20 drives the main shaft 16 to rotate, the crank 17 presses the oil buffer cup, and the oil buffer piston 18 moves downward to the locked position, and the circuit breaker moves to the opening state.

[0035] The limiting mechanism composed of the buckle and the hollow card slot enables the adjusting plate and the mounting plate to have a certain free moving distance in the front and back direction (the moving direction of the coil moving iron core of the opening and closing coil) during assembly, and can also play a limiting role in cooperation with the position adjusting mechanism. Fasteners (such as bolts) are used to pass through the round holes to connect the adjusting plate and the mounting plate, and the opening and closing coil is fixed on the adjustable plate. When the stroke of the opening and closing coil moving iron core is not enough, the distance between the adjusting plate and the mounting plate is adjusted by appropriately increasing the gasket between the mounting holes, so that the moving iron core can push the bent plate to rotate by a sufficient angle, ensuring that the circuit breaker can reliably open and close. The device for adjusting the opening and closing stroke can also ensure that the circuit breaker can reliably open and close at low voltage.

[0036] The above description of the embodiments is for the purpose of enabling and using the invention for those of ordinary skill in the art. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present application without departing from the scope of the present application should be within the scope of protection of the present application.

Claims

1. A device for adjusting the stroke of the opening and closing coils, used for a circuit breaker, characterized in that: include: Mounting plate (1), fixed inside the circuit breaker, An adjusting plate (2) for carrying the opening and closing coil (9) of the circuit breaker, the adjusting plate (2) being connected to the mounting plate (1) and being adjustable in relative position to the mounting plate (1) in the direction of movement of the coil moving iron core (10) of the opening and closing coil (9); The regulating plate (2) and the mounting plate (1) are arranged in a stacked manner, and are connected via a position adjustment mechanism and a limit mechanism to achieve adjustment of the relative position of the moving iron core (10) of the opening and closing coil (9) in the direction of movement; The position adjustment mechanism comprises baffles (3) respectively provided on the adjustment plate (2) and the mounting plate (1) and having circular holes (4), and fasteners passing through the circular holes (4) of the two baffles (3); the circular holes (4) on the two baffles (3) are sequentially provided along the movement direction of the coil moving iron core (10) of the opening and closing coil (9); and the relative position of the adjustment plate (2) and the mounting plate (1) in the movement direction of the coil moving iron core (10) of the opening and closing coil (9) is adjusted by providing a gasket (7) between the two baffles (3); The limiting mechanism comprises a hollow card slot (5) provided on the mounting plate (1) and a buckle (6) provided on the adjustment plate (2), wherein the buckle (6) is composed of a limiting plate (61) and a buckle plate (62) connected in an L-shape, wherein the limiting plate (61) is provided on a side of the adjustment plate (2) in contact with the mounting plate (1) and is located in the hollow card slot (5), and the buckle plate (62) passes through the hollow card slot (5) and is buckled on the mounting plate (1).

2. The device for adjusting the stroke of the opening and closing coil according to claim 1, characterized in that: The position adjustment mechanism and the limit mechanism are located at both ends of the stacked adjustment plate (2) and the mounting plate (1) in the direction of movement of the coil moving iron core (10) of the opening and closing coil (9).

3. A circuit breaker using the device for adjusting the stroke of the opening and closing coil according to any one of claims 1 to 2, characterized in that: The invention comprises a casing (25) and an opening and closing device and a closing holding device arranged in the casing (25), wherein the opening and closing device comprises an opening and closing coil (9), the opening and closing coil (9) is arranged in the casing (25) through the device for adjusting the stroke of the opening and closing coil, the opening and closing coil (9) is provided with an opening and closing button (8) and a coil moving iron core (10), and the closing holding device has a bent plate (13) arranged to match the opening and closing coil (9).

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