CN209766337U - Small-sized circuit breaker - Google Patents

Small-sized circuit breaker Download PDF

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Publication number
CN209766337U
CN209766337U CN201920760356.3U CN201920760356U CN209766337U CN 209766337 U CN209766337 U CN 209766337U CN 201920760356 U CN201920760356 U CN 201920760356U CN 209766337 U CN209766337 U CN 209766337U
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CN
China
Prior art keywords
lock catch
contact
circuit breaker
handle
rod
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Active
Application number
CN201920760356.3U
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Chinese (zh)
Inventor
汪林波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Chuang Qi Electric Co Ltd
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Zhejiang Chuang Qi Electric Co Ltd
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Priority to CN201920760356.3U priority Critical patent/CN209766337U/en
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Abstract

The utility model discloses a miniature circuit breaker, include: the electromagnetic tripping device comprises a shell, a handle, a connecting rod, a lock catch, a lever, a contact rack, a moving contact, a static contact, an electromagnetic trip and a lock catch reset spring for resetting the lock catch; the handle is rotationally connected to the shell; the lock catch is provided with a pulling part which is used for being matched with the connecting rod and is pulled by the connecting rod to drive the lock catch to rotate; one end of the connecting rod is pivotally connected to the handle, and the other end of the connecting rod is hooked with the pulling part; the lever, the lock catch and the contact carrier are coaxially and rotatably connected to the shell; the moving contact is mounted to the contact carrier; the electromagnetic release and the static contact are arranged in the shell; the lock catch return spring is connected with the shell and the lock catch. The utility model discloses an useful part lies in, can realize the auto-lock, and the reliability is high.

Description

Small-sized circuit breaker
Technical Field
The utility model relates to a circuit breaker, concretely relates to miniature circuit breaker.
background
The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition for a predetermined time. A circuit breaker generally includes a contact system, an arc extinguishing system, an operating mechanism, a trip unit, a case, and the like.
Traditional miniature circuit breaker, auto-lock structure is unstable, and the auto-lock reliability is low.
SUMMERY OF THE UTILITY MODEL
in order to solve the defects of the prior art, the utility model provides a miniature circuit breaker can realize the auto-lock, and the reliability is high.
In order to achieve the above object, the utility model adopts the following scheme:
A miniature circuit breaker comprising: the electromagnetic tripping device comprises a shell, a handle, a connecting rod, a lock catch, a lever, a contact rack, a moving contact, a static contact, an electromagnetic trip and a lock catch reset spring for resetting the lock catch;
The handle is rotationally connected to the shell; the lock catch is provided with a pulling part which is used for being matched with the connecting rod and is pulled by the connecting rod to drive the lock catch to rotate; one end of the connecting rod is pivotally connected to the handle, and the other end of the connecting rod is hooked with the pulling part; the lever, the lock catch and the contact carrier are coaxially and rotatably connected to the shell; the moving contact is mounted to the contact carrier; the electromagnetic release and the static contact are arranged in the shell; the lock catch return spring is connected with the shell and the lock catch;
The lock catch has an unlocking position and a locking position relative to the lever; the latch rotates between an unlocked position and a locked position relative to the lever; when the handle rotates, the connecting rod slides in the sliding chute; when in the locking position, the pulling part and the lever lock the connecting rod from two sides; the handle is provided with an open position for separating the moving contact and the static contact from contact and a closed position for contacting the moving contact and the static contact; when the handle is positioned at the disconnection position, the handle pulls the lock catch through the connecting rod to enable the lock catch to be positioned at the unlocking position; when the miniature circuit breaker is in a short-circuit protection state, the electromagnetic release pushes the lock catch to enable the lock catch to be in an unlocking position; the latch return spring urges the latch to move from the unlocked position to the locked position as the handle moves from the open position to the closed position.
Further, the contact carrier is provided with a first driving structure; the lock catch is provided with a second driving structure which is used for being matched with the first driving structure to drive the contact head frame to rotate when the lock catch rotates.
Further, the first driving structure is a driving rib; the second driving structure is a driving groove into which the driving rib can be inserted.
Further, the latch, the contact holder and the lever are arranged in sequence along the rotation axis of the latch.
further, the miniature circuit breaker further includes a first elastic member applying a force between the contact frame and the lever.
further, the first elastic member is a torsion spring.
Further, the miniature circuit breaker further includes a second elastic member for supporting the acting force between the lever and the case.
Further, the second elastic piece is a compression spring.
Further, the connecting rod is a U-shaped connecting rod.
Further, the lock catch return spring is a torsion spring.
the utility model discloses an useful part lies in, can realize the auto-lock, and the reliability is high.
Drawings
fig. 1 is a sectional view of a miniature circuit breaker of the present invention;
FIG. 2 is a schematic diagram of a portion of the structure of the small to medium circuit breaker of FIG. 1, showing the handle in an open position and the latch in an unlocked position;
Fig. 3 is a schematic view of another state of the structure of fig. 2, showing the miniature circuit breaker in a trip protection state;
FIG. 4 is a schematic view of another state of the structure of FIG. 3, showing the handle in the closed position and the latch in the locked position;
FIG. 5 is an exploded view of the structure of FIG. 2;
FIG. 6 is an exploded view of the structure of FIG. 2 from another perspective;
Fig. 7 is a schematic view of a latch of the small and medium sized circuit breaker of fig. 1.
The miniature circuit breaker 100, the housing 10, the handle 20, the connecting rod 30, the latch 40, the pulling portion 41, the driving groove 42, the latch return spring 40a, the lever 50, the contact carrier 60, the movable contact 61, the driving rib 62, the fixed contact 70, the electromagnetic release 80, the first elastic member 91, the second elastic member 92, and the handle return spring 93.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 6, a small circuit breaker 100 includes: the electromagnetic trip device comprises a shell 10, a handle 20, a connecting rod 30, a lock 40, a lever 50, a contact carrier 60, a movable contact 61, a fixed contact 70, an electromagnetic trip 80 and a lock return spring 40 a.
The latch return spring 40a is used to return the latch 40. The electromagnetic trip 80 is used to push the latch 40 to drive the contact holder 60 to rotate when the miniature circuit breaker 100 is in the short-circuit protection state, so as to separate the moving contact 61 from the stationary contact 70. The plunger of the electromagnetic release 80 is used to push the latch 40 in contact with the latch 40.
The handle 20 is rotatably connected to the cabinet 10. The latch 40 is provided with a pulling portion 41. The pulling part 41 is used for cooperating with the connecting rod 30 to pull the lock catch 40 to rotate by the connecting rod 30. One end of the link 30 is pivotally connected to the handle 20, and the other end of the link 30 is hooked with the pulling portion 41. Specifically, the link 30 is a U-shaped link. One end of the U-shaped connecting rod is inserted into the handle 20 and forms a rotary connection with the handle 20. The other end of the U-shaped link hooks the pulling portion 41.
The lever 50, the latch 40 and the contact carrier 60 are coaxially and rotatably connected to the housing 10. The movable contacts 61 are mounted to the contact carrier 60. The electromagnetic trip 80 and the stationary contact 70 are disposed in the housing 10.
The latch return spring 40a connects the housing 10 and the latch 40. The latch return spring 40a applies a force to the latch 40 to return the latch 40. The latch 40 has an unlocked position and a locked position relative to the lever 50. The latch 40 rotates relative to the lever 50 between an unlocked position and a locked position. The latch return spring 40a applies a force to the latch 40 to move the latch 40 from the unlocked position to the locked position.
As a specific embodiment, the contact carrier 60 is provided with a first drive structure. The latch 40 is provided with a second drive arrangement for cooperating with the first drive arrangement to drive the contact carrier 60 in rotation upon rotation of the latch 40. The first drive structure is a drive rib 62. The second drive feature is a drive slot 42 into which a drive rib 62 can be inserted. The rotation of the latch 40 causes the contact holder 60 to rotate. The movable contacts 61 are mounted to the contact carrier 60 to move with the contact carrier 60.
The handle 20 has an open position in which the moving contact 61 and the stationary contact 70 are out of contact and a closed position in which the moving contact 61 and the stationary contact 70 are in contact.
The miniature circuit breaker 100 further includes a first elastic member 91 applying a force between the contact frame 60 and the lever 50. The first elastic member 91 is a torsion spring. The miniature circuit breaker 100 further includes a second elastic member 92 for supporting the force between the lever 50 and the cabinet 10. The second elastic member 92 is a compression spring. The miniature circuit breaker 100 also includes a handle return spring 93 for applying a force to the handle 20. The handle return spring 93 is a torsion spring. The handle return spring 93 connects the handle 20 and the housing 10 to apply a force to the handle 20 to move from the closed position to the open position. The latch return spring 40a is a torsion spring.
In the unlocking position, the pulling part 41 and the lever 50 together form a sliding slot in which the guide link 30 slides, and when the handle 20 is rotated, the link 30 slides in the sliding slot. When the handle 20 is moved to the off position, the handle 20 pulls the pulling portion 41 through the link 30, and the latch 40 is rotated counterclockwise against the urging force of the latch return spring 40 a. The counterclockwise rotation of the latch 40 drives the moving contact frame 60 to rotate counterclockwise, so that the moving contact 61 moves relative to the stationary contact 70, and the moving contact 61 and the stationary contact 70 are separated. When the handle 20 is in the off position, the handle 20 pulls the latch 40 through the link 30 to place the latch 40 in the unlocked position.
in the locking position, the pulling portion 41 and the lever 50 lock the link 30 from both sides. In other words, the latch 40 rotates clockwise due to the force of the latch return spring 40a, the pulling portion 41 approaches the lever 50, and the sliding slot formed by the pulling portion 41 and the lever 50 is reduced or closed. The link 30 cannot be disengaged from the defined position.
When the miniature circuit breaker 100 is in the short-circuit protection state, the electromagnetic trip 80 pushes the latch 40 to place the latch 40 in the unlocked position. By rotating the handle 20, the link 30 can slide in the sliding groove and can be separated from the contact with the lock catch 40. The handle 20 cannot close the gate or the handle 20 cannot remain in the closed position under the action of the handle and return spring. The movable contacts 61 and the stationary contacts 70 remain open.
When the handle 20 moves from the open position to the closed position, the latch return spring 40a pushes the latch 40 to move from the unlock position to the lock position since the pulling force of the handle 20 to the pulling portion 41 of the latch 40 through the link 30 disappears. Specifically, as the handle moves from the open position to the closed position, the end of the link 30 remote from the handle 20 moves upward and to the right, and the latch return spring 40a pushes the latch 40 to rotate clockwise to eventually move the latch 40 to the locked position relative to the lever 50. A certain latching angle is formed between the latch 40 and the lever 50, i.e., the size between the chute reducing pulling portion 41 and the lever 50 is not enough to disengage the link 30 from the lever 50. The handle 20 continues to move to the closed position, pushing the lever 50 to bring the moving contact 61 into contact with the stationary contact 70.
The latch 40, the contact carrier 60 and the lever 50 are arranged in sequence along the rotational axis of the latch 40.
the foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. A miniature circuit breaker, comprising: the electromagnetic tripping device comprises a shell, a handle, a connecting rod, a lock catch, a lever, a contact rack, a moving contact, a static contact, an electromagnetic trip and a lock catch reset spring for resetting the lock catch;
The handle is rotatably connected to the shell; the lock catch is provided with a pulling part which is used for being matched with the connecting rod and is pulled by the connecting rod to drive the lock catch to rotate; one end of the connecting rod is pivotally connected to the handle, and the other end of the connecting rod is hooked with the pulling part; the lever, the lock catch and the contact carrier are coaxially and rotatably connected to the shell; the moving contact is mounted to the contact holder; the electromagnetic release and the static contact are arranged in the shell; the lock catch return spring is connected with the shell and the lock catch;
The lock catch has an unlocked position and a locked position relative to the lever; the latch rotates relative to the lever between the unlocked position and the locked position; when the handle rotates, the connecting rod slides in the sliding groove; when in the locking position, the pulling part and the lever lock the link from both sides; the handle is provided with an open position for separating the moving contact from the fixed contact and a closed position for contacting the moving contact with the fixed contact; when the handle is located at the disconnection position, the handle pulls the lock catch through the connecting rod to enable the lock catch to be located at the unlocking position; when the miniature circuit breaker is in a short-circuit protection state, the electromagnetic release pushes the lock catch to enable the lock catch to be in an unlocking position; when the handle moves from the open position to the closed position, the latch return spring urges the latch to move from the unlocked position to the locked position.
2. A miniature circuit breaker according to claim 1,
the contact head frame is provided with a first driving structure; the lock catch is provided with a second driving structure which is used for being matched with the first driving structure to drive the contact rack to rotate when the lock catch rotates.
3. A miniature circuit breaker according to claim 2,
The first driving structure is a driving rib; the second driving structure is a driving groove into which the driving rib can be inserted.
4. A miniature circuit breaker according to claim 1,
The latch, the contact holder and the lever are sequentially arranged along a rotation axis of the latch.
5. A miniature circuit breaker according to claim 1,
The miniature circuit breaker further comprises a first elastic member applying a force between the contact holder and the lever.
6. a miniature circuit breaker according to claim 5,
the first elastic piece is a torsion spring.
7. A miniature circuit breaker according to claim 1,
The miniature circuit breaker further includes a second elastic member for supporting the acting force between the lever and the case.
8. A miniature circuit breaker according to claim 7,
The second elastic piece is a pressure spring.
9. a miniature circuit breaker according to claim 1,
The connecting rod is a U-shaped connecting rod.
10. a miniature circuit breaker according to claim 1,
the lock catch return spring is a torsion spring.
CN201920760356.3U 2019-05-24 2019-05-24 Small-sized circuit breaker Active CN209766337U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920760356.3U CN209766337U (en) 2019-05-24 2019-05-24 Small-sized circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920760356.3U CN209766337U (en) 2019-05-24 2019-05-24 Small-sized circuit breaker

Publications (1)

Publication Number Publication Date
CN209766337U true CN209766337U (en) 2019-12-10

Family

ID=68761787

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920760356.3U Active CN209766337U (en) 2019-05-24 2019-05-24 Small-sized circuit breaker

Country Status (1)

Country Link
CN (1) CN209766337U (en)

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