CN215527648U

CN215527648U - Circuit breaker

Info

Publication number: CN215527648U
Application number: CN202120202213.8U
Authority: CN
Inventors: 顾斌斌; 李书贤; 卢科军; 杨安; 王周石
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2022-01-14
Anticipated expiration: 2031-01-25

Abstract

The utility model relates to the field of low-voltage electric appliances, in particular to a circuit breaker, which comprises a shell, an electric mechanism and an operating mechanism, wherein the electric mechanism and the operating mechanism are respectively arranged in the shell; the housing comprises a base and a cover which are oppositely matched; the electric mechanism comprises a motor and a gear set which are connected in a driving way, the gear set comprises a plurality of gears which are connected in a driving way in sequence, the operating mechanism comprises a handle piece which is arranged on the shell in a pivoting way, and the gear set is matched with the handle piece in a driving way; the circuit breaker further comprises a braking structure, and at least one gear of the gear set is a matching gear; after the breaker completes the opening operation or closing operation and the motor is powered off, the braking structure is matched with the matching gear to brake the matching gear; the circuit breaker has the advantages that the electric mechanism of the circuit breaker works reliably.

Description

Circuit breaker

Technical Field

The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit breaker.

Background

The existing circuit breaker mostly has the following problems:

1. most of the circuit breakers realize an electric operation function through an electric mechanism consisting of a motor and a gear set, and the gear set and a microswitch are switched and matched; however, after the circuit breaker completes the switching of the microswitch, the motor and the gear set continue to rotate due to the inertia of the motor, so that the stop position of the gear matched with the operating mechanism of the circuit breaker has uncertainty or unreliability.

2. The motor of the electric mechanism is matched with the gear set and is realized by a worm and gear mechanism; however, the worm gear mechanism has low transmission efficiency and serious abrasion, which often causes the failure of the electric operation function.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a circuit breaker, and an electric mechanism of the circuit breaker works reliably.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a circuit breaker comprises a shell, an electric mechanism and an operating mechanism, wherein the electric mechanism and the operating mechanism are respectively arranged in the shell; the housing comprises a base 1 and a cover 6 which are oppositely matched; the electric mechanism comprises a motor 3 and a gear set which are connected in a driving way, the gear set comprises a plurality of gears which are connected in a driving way in sequence, the operating mechanism comprises a handle part 2 which is arranged on the shell in a pivoting way, and the gear set is matched with the handle part 2 in a driving way; the circuit breaker further comprises a braking structure, and at least one gear of the gear set is a matching gear; after the breaker completes the opening operation or closing operation and the motor 3 is powered off, the braking structure is matched with the matching gear to brake the matching gear.

Preferably, the braking structure is a braking column arranged on the housing, the mating gear comprises a braking protrusion arranged on one side of the mating gear, and the braking column is in friction fit with the braking protrusion to brake the mating gear.

Preferably, the gear set comprises a first gear 3-4, a middle gear set 4-1 and a tail gear 4-0 which are sequentially connected in a driving manner, the first gear 3-4 is connected with the motor 3 in a driving manner, and the tail gear 4-0 is matched with the handle part 2 in a driving manner; the brake structure comprises a first closing brake column 10 and a first opening brake column which are arranged on a base 1, a tail gear 4-0 is a matching gear, a first brake bulge 4-01 is arranged on one side, facing the base 1, of the tail gear 4-0, and after the circuit breaker completes opening operation or closing operation and the motor 3 is powered off, the first closing brake column 10 or the first opening brake column is in friction fit with the first brake bulge 4-01 to brake the tail gear 4-0.

Preferably, the braking structure further comprises a second closing braking column 11 arranged on the base 1, and the first closing braking column 10 and the second closing braking column 11 are sequentially arranged on a rotating track of the first braking protrusion 4-01 and are respectively in friction fit with the first braking protrusion 4-01.

Preferably, the braking structure further comprises a second brake separating braking column arranged on the base 1, and the first brake separating braking column and the second brake separating braking column are sequentially arranged on a rotating track of the first braking bulge 4-01 and are respectively in friction fit with the first braking bulge 4-01.

Preferably, the end face of the braking column is in friction fit with the braking protrusion to brake the matching gear.

Preferably, when the electric mechanism drives the circuit breaker to switch on and switch off, the tail gear 4-0 always rotates in the same direction.

Preferably, one end of the braking protrusion is provided with a buffering inclined surface, and when the braking column is matched with the braking protrusion, the buffering inclined surface is firstly contacted with the braking column.

Preferably, the housing further comprises a plurality of motor positioning columns 2-3, the motor 3 comprises a plurality of motor positioning holes 30, and the motor positioning columns 2-3 are matched with the motor positioning holes 30 in a one-to-one manner to limit the position of the motor 3.

The braking structure of the circuit breaker is matched with the matching gear to brake the matching gear, so that the condition that the working stability of the electric mechanism is influenced due to uncertainty and unreliability of the stop position of the gear caused by continuous rotation of the gear of the inertia driving electric mechanism after the motor 3 is powered off is avoided.

Drawings

Fig. 1 is a schematic view of the structure of the circuit breaker of the present invention, the electric mechanism of which is shown by the exploded state;

FIG. 2 is a schematic structural diagram of a base, a circuit board and a tail gear of the present invention, wherein a motor is arranged in a base assembling groove of the base, and a microswitch is arranged on the circuit board;

FIG. 3 is an enlarged structural view of portion A of FIG. 2 illustrating a braking configuration in accordance with the present invention;

FIG. 4 is a schematic structural view of the tail gear of the present invention showing the detent projections;

fig. 5 is a schematic view of the circuit breaker of the present invention with the cover removed;

FIG. 6 is a schematic view of the construction of the lid of the present invention;

fig. 7 is a schematic view of the structure of the motor and the head gear of the present invention.

Detailed Description

The following description will further describe embodiments of the circuit breaker of the present invention with reference to the embodiments shown in fig. 1 to 7. The circuit breaker of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1, 2, 5 and 6, the circuit breaker of the utility model comprises a housing, and an electric mechanism and an operating mechanism which are respectively arranged in the housing; the housing comprises a base 1 and a cover 6 which are oppositely matched; the electric mechanism comprises a motor 3 and a gear set which are connected in a driving mode, the gear set comprises a plurality of gears which are connected in a driving mode in sequence, the operating mechanism comprises a handle piece 2 which is arranged on the shell 1 in a pivoting mode, and the gear set is matched with the handle piece 2 in a driving mode.

Preferably, as shown in figures 1, 2, 5 and 6, the circuit breaker of the utility model further comprises a push-button mechanism drivingly connected to the handle member 2. Furthermore, the electric mechanism 3 directly drives the handle member 2 to rotate towards a first direction to close the circuit breaker, the electric mechanism 3 drives the handle member 2 to rotate towards a second direction through the operating mechanism to open the circuit breaker, and the first direction and the second direction are opposite.

Preferably, as shown in fig. 3 and 4, the circuit breaker further comprises a braking structure, at least one gear of the gear set being a mating gear; after the breaker completes the opening operation or closing operation and the motor 3 is powered off, the braking structure is matched with the matching gear to brake the matching gear. According to the circuit breaker, the braking structure of the circuit breaker is matched with the matching gear to brake the matching gear, so that the situation that the working stability of the electric mechanism is influenced due to uncertainty and unreliability of the stop position of the gear caused by continuous rotation of the gear of the inertia-driven electric mechanism after the power of the motor 3 is cut off is avoided. Further, as shown in fig. 3 and 4, the braking structure is a braking column disposed on the housing, the mating gear includes a braking protrusion disposed on one side thereof, and the braking column is in friction fit with the braking protrusion to brake the mating gear. Furthermore, the brake column and the shell are of an integrated structure and are made of the same material; or the braking column is an elastic plastic piece or a spring.

It should be noted that the braking structure may also be an elastic member, and is in limit fit with the braking protrusion of the mating gear (not through friction deceleration), when the circuit breaker completes the opening operation or the closing operation and the motor 3 is powered off, the braking structure is enough to block the braking protrusion because the power is only the inertia of the motor 3, but when the motor 3 is powered on here, the braking protrusion forces the braking structure to deform under the driving of the motor 3, so that the circuit breaker can normally perform the next operation.

Preferably, as shown in fig. 5 to 7, the housing includes a plurality of motor positioning posts 2-3, the motor 3 includes a plurality of motor positioning holes 30, and the motor positioning posts 2-3 are matched with the motor positioning holes 30 one to limit the position of the motor 3. The matching mode between the shell and the motor 3 is simple and reliable, the motor 3 is convenient to assemble, and the reliable positioning of the motor 3 is ensured. Further, the shell further comprises a motor positioning groove, and the motor 3 is arranged in the motor positioning groove.

Preferably, the axes of the gears of the gear set are parallel to the axis of the motor 3, and compared with the existing mode of realizing the driving connection between the motor 3 and the gear set by adopting a worm gear mode, the transmission process is more reliable, and the power is more stable.

The circuit breaker of the present invention will be further described with reference to the drawings and the specific embodiments.

As shown in fig. 1-7, one embodiment of the circuit breaker of the present invention is shown.

As shown in fig. 1, 2, 5, and 6, the circuit breaker of the present invention is preferably a plug-in circuit breaker, and includes a housing, and an electric mechanism, an operating mechanism, a button mechanism, a moving contact 3a and a stationary contact 4a, which are respectively disposed in the housing; the housing comprises a base 1 and a cover 6 which are oppositely matched; the operating mechanism comprises a handle member 2 pivotally arranged on the housing; the electric mechanism comprises a motor 3 and a gear set which are connected in a driving way, and the gear set is also connected with the handle part 2 in a driving way; the button mechanism is in driving connection with the handle part 2, and the operating mechanism is in driving connection with the moving contact 3 a; the handle member 2 is driven to rotate to enable the breaker to be switched on or switched off.

Preferably, the gear set is also in driving fit with the button mechanism; the electric mechanism 3 directly drives the handle part 2 to rotate towards a first direction to enable the breaker to be switched on, the electric mechanism 3 drives the handle part 2 to rotate towards a second direction through the button mechanism to enable the breaker to be switched off, and the first direction and the second direction are opposite. Further, the button mechanism comprises a button member 70, a first connecting rod 71, a transmission member 72 and a second connecting rod 73 which are sequentially connected in a driving manner, the button member 70 is arranged on the shell in a sliding manner, two ends of the second connecting rod 73 are respectively connected with the transmission member 72 and the handle member 2 in a driving manner, and the transmission member 72 is further matched with the electric mechanism in a driving manner.

Preferably, the operating mechanism further comprises a third connecting rod 74, a rotating plate 80 pivotally disposed on the housing, and a locking member 81 and a tripping member 82 pivotally disposed on the rotating plate 80 and respectively engaged with the locking member 81 and the tripping member 82, the handle member 2 is drivingly connected to the locking member 81 through the third connecting rod 74, and the rotating plate 80 is drivingly connected to the movable contact 3 a. It is noted that the operating mechanism can be implemented by means of the prior art and will not be described in further detail here.

Certainly, as shown in fig. 1 and 5, the circuit breaker of the present invention may further include a short-circuit protection mechanism 1a, an arc extinguish chamber 2a, and an overload protection mechanism 9, where the short-circuit protection mechanism 1a and the overload protection mechanism 9 are respectively in driving fit with the tripping element 82 of the operating mechanism, and when a short-circuit fault or an overload fault occurs, the circuit breaker is opened or tripped, and the arc extinguish chamber 2a is matched with the movable contact 3a and the fixed contact 4a, so as to improve the arc extinguishing performance of the circuit breaker.

Preferably, as shown in fig. 1, is an embodiment of the electric mechanism.

The electric mechanism 3 comprises a motor 3 and a gear set which are connected in a driving mode, the gear set comprises a first gear 3-4, a middle gear set 4-1 and a tail gear 4-0 which are connected in a driving mode in sequence, the first gear 3-4 is connected with the motor 3 in a driving mode, and the tail gear 4-0 is matched with a handle piece 2 of the operating mechanism and a transmission piece 72 of the button mechanism in a driving mode respectively.

Preferably, as shown in fig. 7, the head gear 3-4 comprises a head gear shaft hole 3-40, and the side wall of the head gear shaft hole 3-40 is provided with at least one head gear limiting side surface; the output shaft of the motor 3 comprises at least one shaft limiting side surface, the output shaft is inserted into the head gear shaft holes 3-40, and the shaft limiting side surface is in limiting fit with the head gear limiting side surface. Specifically, as shown in fig. 7, the cross section of the head gear shaft hole 3-40 is a D-shaped structure, and the cross section of the output shaft is a D-shaped structure.

Preferably, the gear set comprises a plurality of gears which are in turn drive connected, and the axis of each gear is parallel to the axis of the motor 3. Specifically, the axes of the first gear 3-4, each gear of the intermediate gear set 4-1 and the tail gear 4-0 are parallel to the axis of the motor 3.

The electric motor 3 cooperates with the housing in the following way:

preferably, as shown in fig. 5 to 7, the housing includes a plurality of motor positioning posts 2-3, the motor 3 includes a plurality of motor positioning holes 30, and the motor positioning posts 2-3 are matched with the motor positioning holes 30 one to limit the position of the motor 3.

Preferably, as shown in fig. 5-7, the housing further includes a motor positioning slot, and the motor 3 is disposed in the motor positioning slot. Further, as shown in fig. 5 and 6, the motor positioning groove includes a base positioning groove and a cover positioning groove which are relatively engaged, and respectively engaged with both ends of the motor 3.

Preferably, as shown in fig. 5 to 7, the motor positioning hole 30 is provided on the end surface of the motor 3 facing the cover 6, and the motor positioning post 2-3 is provided on the cover 6. Specifically, as shown in fig. 5 to 7, two motor positioning holes 30 are respectively disposed on two sides of the output shaft of the motor 3, and two motor positioning posts 2 to 3 are disposed in the cover positioning groove.

Preferably, as shown in fig. 1 to 4, the circuit breaker of the present invention further comprises a braking structure, at least one gear of the gear set of the electric mechanism is a mating gear; after the breaker completes the opening operation or closing operation and the motor 3 is powered off, the braking structure is in driving fit with the matching gear to brake the matching gear. Further, as shown in fig. 3 and 4, the braking structure is a braking column disposed on the housing, the mating gear includes a braking protrusion disposed on one side thereof, and the braking column is in friction fit with the braking protrusion to brake the mating gear. Furthermore, the end face of the braking column is in friction fit with the braking protrusion to brake the matching gear.

Preferably, when the electric mechanism drives the circuit breaker to switch on and switch off, the tail gear 4-0 of the gear set always rotates in the same direction. Furthermore, one end of the braking protrusion is provided with a buffering inclined plane, and when the braking column is matched with the braking protrusion, the buffering inclined plane is firstly contacted with the braking column, so that the matching of the braking column and the braking protrusion is smoother.

Preferably, the circuit breaker of the present invention further includes a control circuit board and a micro switch 5 disposed on the control circuit board, the micro switch 5 is in driving fit with the tail gear 4-0, when the circuit breaker is switched on or switched off, the micro switch 5 is driven by the tail gear 4 to change the state (switched from the closed state to the open state or switched from the open state to the closed state) so as to realize the power failure of the motor 3, for example, the micro switch 5 is connected in a power supply loop of the motor 3, or the micro switch 5 transmits the switching on or switching off to a microprocessor on the control circuit board, and the microprocessor controls the power failure of the motor 3.

As shown in fig. 3 and 4, the following is a specific implementation of the braking structure and mating gears:

as shown in fig. 1 and 2, the gear set comprises a first gear 3-4, a middle gear set 4-1 and a tail gear 4-0 which are sequentially connected in a driving manner, the first gear 3-4 is connected with a motor 3 in a driving manner, and the tail gear 4-0 is matched with the handle member 2 in a driving manner; the braking structure comprises a first closing braking column 10 and a first opening braking column which are arranged on a base 1, a tail gear 4-0 is a matching gear, a first braking protrusion 4-01 is arranged on one side, facing the base 1, of the tail gear 4-0, and after the circuit breaker completes opening operation, the first closing braking column 10 or the first opening braking column is in friction fit with the first braking protrusion 4-01 to brake the tail gear 4-0.

Preferably, as shown in fig. 3 and 4, one end of each of the first closing brake post 10 and the second closing brake post 11 is connected to the base 1, and the end surface of the other end is in friction fit with the first braking protrusion 4-01.

Preferably, one end of each of the first brake-separating column and the second brake-separating column is connected with the base 1, and the end surface of the other end of each of the first brake-separating column and the second brake-separating column is in friction fit with the first brake bulge 4-01.

Preferably, when the electric mechanism drives the circuit breaker to switch on or switch off, the tail gear 4-0 always rotates in the same direction, and then the first switching-on brake column 10, the second switching-on brake column 11, the first switching-off brake column and the second switching-off brake column are sequentially arranged on the moving track of the first brake bulge 4-01.

Preferably, as shown in fig. 4, the tail gear 4-0 further includes a tail gear shaft hole 4-00, and the first braking protrusion 4-01 is disposed at one side of the tail gear shaft hole 4-00.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims

1. A circuit breaker comprises a shell, an electric mechanism and an operating mechanism, wherein the electric mechanism and the operating mechanism are respectively arranged in the shell; the housing comprises a base (1) and a cover (6) which are oppositely matched; the electric mechanism comprises a motor (3) and a gear set which are connected in a driving mode, the gear set comprises a plurality of gears which are connected in a driving mode in sequence, the operating mechanism comprises a handle piece (2) which is arranged on the shell in a pivoting mode, and the gear set is matched with the handle piece (2) in a driving mode; the method is characterized in that: the circuit breaker further comprises a braking structure, and at least one gear of the gear set is a matching gear; after the breaker completes the opening operation or closing operation and the motor (3) is powered off, the braking structure is matched with the matching gear to brake the matching gear.

2. The circuit breaker of claim 1, wherein: the braking structure is a braking column arranged on the shell, the matching gear comprises a braking bulge arranged on one side of the matching gear, and the braking column is in friction fit with the braking bulge to brake the matching gear.

3. The circuit breaker of claim 2, wherein: the gear set comprises a head gear (3-4), a middle gear set (4-1) and a tail gear (4-0) which are sequentially connected in a driving manner, the head gear (3-4) is connected with the motor (3) in a driving manner, and the tail gear (4-0) is matched with the handle piece (2) in a driving manner; the braking structure comprises a first closing braking column (10) and a first opening braking column which are arranged on a base (1), a tail gear (4-0) is a matching gear, a first braking protrusion (4-01) is arranged on one side, facing the base (1), of the tail gear (4-0), and after the circuit breaker completes opening operation or closing operation and the motor (3) is powered off, the first closing braking column (10) or the first opening braking column is in friction fit with the first braking protrusion (4-01) to brake the tail gear (4-0).

4. The circuit breaker of claim 3, wherein: the brake structure further comprises a second closing brake column (11) arranged on the base (1), and the first closing brake column (10) and the second closing brake column (11) are sequentially arranged on the rotating track of the first brake bulge (4-01) and are respectively in friction fit with the first brake bulge (4-01).

5. The circuit breaker of claim 3, wherein: the brake structure further comprises a second brake separating brake column arranged on the base (1), and the first brake separating brake column and the second brake separating brake column are sequentially arranged on the rotating track of the first brake bulge (4-01) and are respectively in friction fit with the first brake bulge (4-01).

6. The circuit breaker of claim 2, wherein: the end face of the brake column is in friction fit with the brake bulge to brake the matching gear.

7. The circuit breaker of claim 6, wherein: when the electric mechanism drives the breaker to switch on and switch off, the tail gear (4-0) always rotates in the same direction.

8. The circuit breaker of claim 7, wherein: one end of the braking protrusion is provided with a buffering inclined plane, and when the braking column is matched with the braking protrusion, the buffering inclined plane is firstly contacted with the braking column.

9. The circuit breaker of claim 1, wherein: the shell further comprises a plurality of motor positioning columns (2-3), the motor (3) comprises a plurality of motor positioning holes (30), and the motor positioning columns (2-3) are matched with the motor positioning holes (30) in a one-to-one mode to limit the motor (3).