CN220796569U

CN220796569U - Circuit breaker

Info

Publication number: CN220796569U
Application number: CN202322311721.1U
Authority: CN
Inventors: 陈红宁; 张晨; 周小亮
Original assignee: Shanghai Siyuan Low Voltage Switchgear Co ltd
Current assignee: Shanghai Siyuan Low Voltage Switchgear Co ltd
Priority date: 2023-08-25
Filing date: 2023-08-25
Publication date: 2024-04-16
Anticipated expiration: 2033-08-25

Abstract

The utility model discloses a circuit breaker, and belongs to the technical field of circuit breakers. The novel arc extinguishing device comprises a main shell and contact systems, wherein a placing cavity is formed in the main shell, a circular rotating shaft is rotatably sleeved at the middle position of the placing cavity, an operating structure is further arranged on the main shell, two contact systems which are symmetrical with each other in center relative to the circular rotating shaft are further arranged in the placing cavity, each contact system comprises a moving contact, and the moving contact is arranged on the circular rotating shaft. The utility model is used in new energy industries such as direct current 1500V and above photovoltaic, energy storage and the like, and has simple structure and strong breaking capacity; compared with the traditional magnetic tripping, the magnetic tripping device omits part of the structure, quickens the tripping speed, has simple structure, reduces the production cost and shortens the production period; by adopting the straight plate-shaped static contact, the production cost is saved, and more arc extinguishing grid plates can be arranged while the opening distance is increased on the premise of not increasing the external dimension, so that the reliability of opening and closing is effectively improved.

Description

Circuit breaker

Technical Field

The utility model relates to a circuit breaker, belongs to the technical field of circuit breakers, and particularly relates to a circuit breaker for new energy industries such as direct current 1500V photovoltaic and energy storage and the like.

Background

A circuit breaker is a circuit protection device generally used for breaking and closing a load circuit and breaking a fault circuit, and realizes breaking control of the circuit through an operation structure.

At present, the circuit breaker for new energy industries such as direct current 1500V and above photovoltaic, energy storage and the like basically adopts a technical route of multipolar series connection of a single-breakpoint circuit breaker, has limited breaking capacity, and once current or voltage is overlarge in actual use, the reliability and stability are not high, a certain risk is generated on the whole circuit, the service life is not long, and the circuit breaker is easy to damage, so that the actual use requirement of the voltage at the direct current 1500V and above is difficult to meet.

Disclosure of Invention

The utility model provides a circuit breaker, which solves the technical problems of low reliability and stability of the existing high-voltage direct-current single-breakpoint circuit breaker.

The utility model is realized by adopting the following technical scheme: the circuit breaker comprises a main shell, wherein a placing cavity is formed in the main shell, a circular rotating shaft is rotatably sleeved at the middle position of the inner part of the placing cavity, an operation structure is further arranged on the main shell, moving contacts are further arranged in the placing cavity, each moving contact comprises a conducting rod, the end parts of the two ends of each conducting rod are respectively connected with a moving contact, each conducting rod is sleeved on the corresponding circular rotating shaft and is symmetrical relative to the center of the circle where the circular rotating shaft is located, two fixed contacts are further arranged in the main shell and correspond to the corresponding two moving contacts, a tripping assembly is arranged on one side of the top of the main shell and is used for driving the operation structure, the operation structure drives the circular rotating shaft, and the two moving contacts and the two fixed contacts are simultaneously contacted or separated through rotation of the circular rotating shaft to form a double-breaking-point switching structure;

the inside of the main shell is also provided with two arc extinguishing systems, and the end part of each movable contact is respectively positioned in each arc extinguishing system;

each arc extinguishing system comprises an arc extinguishing chamber, a plurality of arc extinguishing grid plates are arranged in the arc extinguishing chamber, and each static contact is respectively positioned at the end part of the arc extinguishing chamber.

The high-voltage direct current breaker structure with double breakpoints is higher in stability and higher in reliability compared with the existing breaker with single breakpoints, and particularly has strong breaking capacity under the condition of higher voltage or higher current, so that the reliability of the whole circuit can be ensured.

In addition, two moving contacts are located inside the circuit breaker, and one end of each moving contact extends into an arc extinguishing grid sheet of the arc extinguishing chamber.

Preferably, the stationary contact adopts a flat plate.

Preferably, the flat plate of the static contact is nearly parallel to the arc extinguishing grid sheet.

Preferably, the shape of the static contact is a curved shape.

Preferably, the operation structure comprises a four-bar structure, the four-bar structure is connected with a driving rod, the driving rod is hinged on a circular rotating shaft, a connecting sheet is fixedly connected with a shaft core where the circular rotating shaft is located, one end of the traction rod is hinged with the four-bar structure, the traction rod drives the four-bar structure to drive, the four-bar structure moves to drive the driving rod to rotate, and the driving rod drives the circular rotating shaft to rotate.

Preferably, the two ends of the connecting sheet are respectively sleeved with a guide rod, the main shell is provided with a guide groove, the guide rods are arranged in the guide grooves, and when the circular rotating shaft rotates, the circular rotating shaft drives the connecting sheet to rotate, so that the two guide rods are driven to move in the two guide grooves.

Preferably, a plurality of sub-shells are respectively placed on one side or two sides of the main shell, each sub-shell is provided with the circular rotating shaft, the moving contact, the fixed contact and the arc extinguishing system, the circular rotating shaft on the sub-shells, the moving contact on the sub-shells, the fixed contact on the sub-shells and the arc extinguishing system on the sub-shells are identical to the above arrangement, and the circular rotating shaft on the plurality of sub-shells and the circular rotating shaft on the main shell are connected with an operating mechanism through guide rods, so that the double-breakpoint opening and closing structure is formed on the main shell, and the double-breakpoint opening and closing structure is also formed on the plurality of sub-shells.

Preferably, the main housing or each sub-housing is provided with two exhaust channels, each exhaust channel is formed by an arc extinguishing chamber top space, and the exhaust channels are larger and larger along the opening direction of the moving contact.

Preferably, the air flow outlet of each exhaust passage communicates to the outside of the circuit breaker.

Preferably, the tripping assembly comprises an armature which is rotationally sleeved on the circuit breaker and a magnetic yoke which is fixedly arranged on the circuit breaker, the armature corresponds to the magnetic yoke, the armature is sleeved on the thermal tripping, the thermal tripping is double-gold, an adjusting bolt is arranged on the side wall of the top of the double-gold, the adjusting bolt corresponds to a traction rod arranged on an operation structure on the circuit breaker, when the double-gold is heated and bent, the adjusting bolt contacts with the traction rod and moves the traction rod, and through the movement of the operation structure, the moving contact rotates to a brake separating position on a circular rotating shaft, so that the circuit breaker is opened and closed.

Preferably, the trip assembly further comprises an outlet line, the middle part of the outlet line is positioned between the armature and the magnetic yoke, one end of the outlet line is fixed on the main shell, and the bottom of the double-gold is connected with the outlet line.

Furthermore, the bottom side wall of the wire outlet row and the bottom side wall of the double-gold are respectively provided with a fixed mounting hole, and the wire outlet row and the fixed mounting holes in the double-gold are fixed through connecting pieces, wherein the connecting pieces are rivets.

By adopting the technical scheme of the double-breakpoint, compared with the thermomagnetic tripping module additionally arranged in the traditional alternating-current double-breakpoint plastic-case circuit breaker, the double-metal armature and the magnetic yoke are directly connected with the outgoing line row and directly act with the traction rod, so that an intermediate transmission shaft of the thermomagnetic tripping module is omitted, a primary tripping transmission chain is reduced, the fault tripping time is shortened, and on the other hand, the technical scheme of the utility model does not need additional parts such as a base, a transmission shaft, a trigger rod and the like, thereby effectively reducing the cost and the assembly difficulty.

The beneficial effects of the utility model are as follows:

(1) The utility model is used for new energy industries such as photovoltaic, energy storage and the like with direct current of 1500V and above, adopts a double-breakpoint structure, effectively reduces the volume of the circuit breaker, and has stronger breaking capacity and higher breaking reliability compared with a single-breakpoint circuit breaker with the same number of poles;

(2) According to the utility model, a double-breakpoint structure is adopted, and under the condition that the overall performance and the size of the circuit breaker are unchanged, the exhaust channel is arranged in the circuit breaker, so that the space is increased, and the reliability of the disconnection is improved;

(3) Except at the 2 nd point, compared with a tripping module in a traditional double-breakpoint molded case circuit breaker, the tripping assembly omits a part of tripping transmission structure, so that double-metal and armature iron directly act on a traction rod, the tripping speed is increased, the integral structure is simplified, the production period is shortened, and the production cost is reduced;

(4) Besides the 2 nd and the 3 rd points, the technical scheme of the utility model also adopts the static contact of the straight plate, thereby saving the production cost, and increasing the opening distance and simultaneously arranging more arc extinguishing grid plates on the premise of not increasing the external dimension, so that the reliability of the switching-on and switching-off is effectively improved.

Drawings

FIG. 1 is a schematic view of the structure of the present utility model, wherein the arrow direction is the exhaust direction;

FIG. 2 is a schematic diagram of the portion A in FIG. 1;

FIG. 3 is a schematic diagram of a trip assembly of the present utility model;

FIG. 4 is a schematic diagram of an armature in a view according to the present utility model;

FIG. 5 is a schematic diagram of a structure of a second embodiment of the present utility model;

FIG. 6 is a schematic diagram of the present utility model in the case of a main housing, a sub-housing, and two poles;

in the figure: a main housing 1; an armature 2; a yoke 3; double gold 4; a traction rod 5; a placement chamber 6; a circular rotating shaft 7; a stationary contact 8 of the flat plate; an exhaust passage 9; a moving contact 10; an arc extinguishing chamber 11; arc extinguishing grid plates 12; a wire outlet row 13; a contact portion 14; a guide rod 15; a bearing housing 16; a shaft 17; a return torsion spring 18; screw hole 19, curved fixed contact 20, connection piece 21, actuating lever 22.

Detailed Description

The utility model will be further described with reference to the following detailed drawings, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

Example 1

As shown in fig. 1-4, a circuit breaker comprises a main casing 1, a placing cavity 6 is arranged in the main casing 1, a circular rotating shaft 7 is rotatably sleeved at the middle position in the placing cavity 6, an operation structure is further arranged on the main casing 1, moving contacts 10 are further arranged in the placing cavity 6, the moving contacts 10 comprise conducting rods, the two end parts of each conducting rod are respectively connected with a moving contact, the conducting rods are sleeved on the circular rotating shaft 7 and are centrally symmetrical relative to the center of the circle where the circular rotating shaft 7 is located, two straight plate-shaped fixed contacts 8 are further arranged in the main casing 1, the two straight plate-shaped fixed contacts 8 correspond to the two moving contacts, a tripping component is arranged on one side of the top of the main casing 1 and is used for driving the operation structure, and the operation structure drives the circular rotating shaft 7 to enable the two moving contacts to be simultaneously contacted with or separated from the two straight plate-shaped fixed contacts 8 through rotation of the circular rotating shaft 7, so as to form a double-breaking-point opening-closing structure;

two arc extinguishing systems are further arranged in the main shell 1, and end parts of each movable contact are respectively positioned in each arc extinguishing system;

each arc extinguishing system comprises an arc extinguishing chamber 11, a plurality of arc extinguishing grid plates 12 are arranged in the arc extinguishing chamber 11, and each straight plate-shaped fixed contact 8 is respectively positioned at the end part of the arc extinguishing chamber 11.

The moving contacts 10 are all located inside the circuit breaker, and one end of each moving contact 10 extends into the arc extinguishing chamber 11.

The operation structure comprises a four-bar structure, the four-bar structure is connected with a driving rod 22, the driving rod 22 is hinged on a circular rotating shaft 7, a connecting sheet 21 is fixedly connected with a shaft core where the circular rotating shaft 7 is located, one end of a traction rod 5 is hinged with the four-bar structure, the traction rod 5 drives the four-bar structure to drive, the four-bar structure drives the driving rod 22 to rotate, and the driving rod 22 drives the circular rotating shaft 7 to rotate.

The two ends of the connecting sheet 21 are respectively sleeved with a guide rod 15, the main shell 1 is provided with a guide groove, the guide rods 15 are arranged in the guide grooves, and when the circular rotating shaft 7 rotates, the circular rotating shaft 7 drives the connecting sheet 21 to rotate, so that the two guide rods 15 are driven to move in the two guide grooves.

As shown in fig. 6, 1 sub-housing is placed on one side or two sides of the main housing 1, the inside of the 1 sub-housing is provided with the circular rotating shaft 7, the moving contact 10, the fixed contact 8 of the flat plate and the arc extinguishing system, which are all the same as the above-mentioned settings, the circular rotating shaft 7 on the sub-housing, the fixed contact 8 of the flat plate on the sub-housing and the arc extinguishing system on the sub-housing, and the circular rotating shaft 7 on the 1 sub-housing and the circular rotating shaft 7 on the main housing 1 are connected together through the guide rod 15 to form a double-breakpoint opening and closing structure on the main housing 1, and meanwhile, the double-breakpoint opening and closing structure is also realized on the 1 sub-housing (it is to be noted that, the tripping assemblies are all arranged on the main housing or each sub-housing, and the plurality of tripping assemblies are all contacted with the traction rod on the same operating mechanism).

Two exhaust channels 9 are arranged on the main shell 1 or each sub-shell, each exhaust channel 9 is formed by the top space of the arc extinguishing chamber 11, and the opening direction of the exhaust channel 11 along the moving contact 10 is larger and larger.

The exhaust passage 9 is configured as described above, so that the gas inside the circuit breaker can be exhausted as early as possible, and the moving contact 10 and the stationary contact 8 of the flat plate can be opened and closed.

One end of each exhaust passage 9 communicates to the outside of the circuit breaker.

The operation structure comprises a four-bar structure, the four-bar structure is connected with a driving rod 22, the driving rod 22 is hinged with a connecting sheet 21, the connecting sheet 21 is fixedly connected with a shaft core where the circular rotating shaft 7 is located, one end of a traction rod 20 is hinged with the four-bar structure, the traction rod 5 is driven to drive the four-bar structure to drive, the four-bar structure is driven to rotate, the driving rod 22 drives the connecting sheet 21 to rotate, and finally the circular rotating shaft 7 is driven to rotate, so that the movable contact 10 is driven to rotate.

The tripping assembly comprises an armature 2 which is rotationally sleeved on the circuit breaker and a magnetic yoke 3 which is fixedly installed on the circuit breaker, the armature 2 corresponds to the magnetic yoke, the armature 2 is sleeved on the thermal tripping, the thermal tripping is double-gold 4, an adjusting bolt is arranged on the side wall of the top of the double-gold 4, the adjusting bolt corresponds to a traction rod 5 which is arranged on an operation structure on the circuit breaker, when the double-gold 4 heats and bends, through the movement of the operation structure, a moving contact rotates to a brake separating position on a circular rotating shaft 7, and the circuit breaker is opened and closed.

The stationary contact 8 of the flat plate is nearly parallel to the arc chute 12.

The tripping assembly further comprises an outgoing line row 13, the middle part of the outgoing line row 13 is positioned between the armature 2 and the magnetic yoke 3, one end of the outgoing line row 13 is fixed on the main shell, and the bottom of the double-metal 4 is connected with the outgoing line row 13.

It should be noted that, the bottom side wall of the wire outlet row 13 and the bottom side wall of the double-gold wire 4 are both provided with fixed mounting holes 19, and the double-gold wire 4 and the wire outlet row 13 are fixed by mounting connecting pieces in the two fixed mounting holes 19, wherein: the connecting piece is a rivet.

By adopting the scheme, the thermomagnetic tripping device is different from the thermomagnetic tripping module additionally arranged on the existing double-breakpoint molded case circuit breaker, the double-metal armature and the magnetic yoke are directly connected with the outgoing line row and directly act with the traction rod, the middle transmission shaft of the thermomagnetic tripping module is omitted, the primary tripping transmission chain is reduced, and the fault tripping time is shortened.

One end of the traction rod 5 is provided with a bulge, and the bulge on the traction rod 5 corresponds to the end of the adjusting bolt.

The magnetic yoke 3 has a flat plate structure, and the armature 2 has a bent structure.

By adopting the scheme, the purpose is that the magnetic yoke 3 reduces the cost and can realize heavy current tripping.

The two ends of the armature 2 are respectively provided with a bending structure, the two bending structures correspond to each other, the top of the armature 2 is also provided with a contact part 14, the top of the contact part 14 is provided with a bent contact end point, and the bent contact point corresponds to the protrusion on the traction rod 5.

The bottom of the armature 2 is provided with a bearing seat 16, and the bearing seat 16 is sleeved on the circuit breaker through a shaft 17; the shaft 17 is sleeved with a reset torsion spring 18, one end part of the reset torsion spring 18 is propped against the outlet wire row 13, and the other end part is propped against the side wall of the armature 2.

With the above solution, the purpose is to enable the armature 2 to return, i.e. to achieve separation and coupling between the armature 2 and the yoke 3, with the aid of the return spring 18 and with the cooperation of the shaft 17.

The working principle of the circuit breaker comprises the following steps:

s1, when overload current exists in a circuit, the double-metal 4 heats and bends to deform until contacting with a traction rod 5 on an operation structure and enabling the traction rod to move, a four-bar linkage on the operation structure is unlocked, and a movable contact 10 moves to a breaking position under the driving of the operation structure, so that the breaker is broken;

s2, when short-circuit current exists in the circuit, the armature 2 moves towards the magnetic yoke 3 under the action of a magnetic field, when the armature 2 contacts with the traction rod 5 and moves, the four connecting rods on the operation structure unlock, and the moving contact 10 moves towards the brake-separating position under the drive of the operation structure.

S2 specifically comprises the following steps: when the four connecting rods on the operation structure are unlocked, the operation structure drives the circular rotating shaft 7 to rotate (the traction rod 5 on the operation structure drives the four connecting rods on the operation structure to act, one of the four connecting rods is sleeved on the circular rotating shaft 7, so that the circular rotating shaft 7 is driven to rotate), thereby driving the two moving contacts 10 to rotate, further realizing that the moving contacts 10 are simultaneously separated from the fixed contacts 8 of the two straight plates in the arc extinguishing grid sheet 12, and when the two moving contacts 10 are simultaneously contacted with the fixed contacts 8 of the two straight plates, an arc generated at the moment enters the arc extinguishing chamber 11, and the arc extinguishing grid sheet 12 gradually weakens the arc until the arc is extinguished.

Example 2

The present embodiment is basically the same as embodiment 1 except that, as shown in fig. 5, the stationary contact 8 of the flat plate in embodiment 1 is changed to a stationary contact 20 of a curved shape in the present embodiment.

Example 3

The embodiment is basically the same as embodiment 1, except that the trip assembly in this embodiment does not contain the double gold 4, and the rest of the structure is unchanged.

Example 4

The embodiment is basically the same as embodiment 2, except that the trip assembly in this embodiment does not contain the double gold 4, and the rest of the structure is unchanged.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be appreciated by persons skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the spirit and scope of the utility model as hereinafter claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a circuit breaker, includes the main casing, the inside of main casing is equipped with places the chamber, its characterized in that: the device comprises a main shell, a rotating shaft, an operating structure, a moving contact, a conducting rod, two fixed contacts, a tripping component and a double-breakpoint opening and closing structure, wherein the middle position inside the placing cavity is rotatably sleeved with the circular rotating shaft, the main shell is also provided with the operating structure, the moving contact is further arranged inside the placing cavity and comprises the conducting rod, the two end parts of the conducting rod are respectively connected with the moving contact, the conducting rod is sleeved on the circular rotating shaft and is centrally symmetrical relative to the circle center of the circular rotating shaft, the two fixed contacts are also arranged inside the main shell and correspond to the two moving contacts, one side of the top of the main shell is provided with the tripping component, the tripping component is used for driving the operating structure, the operating structure drives the circular rotating shaft, and the two moving contacts and the two fixed contacts are simultaneously contacted or separated through rotation of the circular rotating shaft, so that the double-breakpoint opening and closing structure is formed;

2. A circuit breaker according to claim 1, characterized in that: the static contact adopts a flat plate.

3. A circuit breaker according to claim 1, characterized in that: the shape of the static contact is a bending shape.

4. A circuit breaker according to claim 1, characterized in that: the operation structure comprises a four-bar structure and a traction rod, the four-bar structure is connected with a driving rod, the driving rod is hinged on a circular rotating shaft, a connecting sheet is fixedly connected with a shaft core where the circular rotating shaft is located, one end of the traction rod is hinged with the four-bar structure, the traction rod drives the four-bar structure to drive, the four-bar structure drives the driving rod to rotate, and the driving rod drives the circular rotating shaft to rotate.

5. A circuit breaker according to claim 4, wherein: the guide rods are sleeved at the two ends of the connecting sheet respectively, the main shell is provided with guide grooves, the guide rods are arranged in the guide grooves, and when the circular rotating shaft rotates, the circular rotating shaft drives the connecting sheet to rotate, so that the two guide rods are driven to move in the two guide grooves.

6. A circuit breaker according to claim 5, wherein: one side or both sides of main casing place a plurality of branch casing respectively, and the circular pivot on a plurality of branch casing and the circular pivot on the main casing all connect an operating device jointly through the guide bar for realize forming on the main casing and open and shut the structure outside two breakpoint, also realize two breakpoint on a plurality of branch casings simultaneously and open and shut the structure.

7. A circuit breaker according to claim 6, wherein: two exhaust channels are arranged on the main shell or each sub-shell, each exhaust channel is formed by an arc extinguishing chamber top space, and the exhaust channels are larger and larger along the opening direction of the moving contact.

8. A circuit breaker according to claim 4, wherein: the tripping assembly comprises an armature which is rotationally sleeved on the circuit breaker and a magnetic yoke which is fixedly installed on the circuit breaker, the armature corresponds to the magnetic yoke, the armature is sleeved on the thermal tripping, the thermal tripping is double-gold, an adjusting bolt is arranged on the side wall of the top of the double-gold, the adjusting bolt corresponds to a traction rod which is arranged on an operation structure of the circuit breaker, when the double-gold is heated and bent, the adjusting bolt contacts with the traction rod and moves, and through the movement of the operation structure, a moving contact rotates to a brake opening position on a circular rotating shaft, so that the circuit breaker is opened.

9. A circuit breaker according to claim 8, wherein: the tripping assembly further comprises an outgoing line row, the middle part of the outgoing line row is positioned between the armature and the magnetic yoke, one end of the outgoing line row is fixed on the main shell, and the bottom of the double-gold is connected with the outgoing line row.

10. A circuit breaker according to claim 8, wherein: the end part of one end of the traction rod is provided with a bulge, and the bulge on the traction rod corresponds to the end part of the adjusting bolt.