CN211125532U - Link mechanism for circuit breaker and circuit breaker - Google Patents
Link mechanism for circuit breaker and circuit breaker Download PDFInfo
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- CN211125532U CN211125532U CN201921948094.XU CN201921948094U CN211125532U CN 211125532 U CN211125532 U CN 211125532U CN 201921948094 U CN201921948094 U CN 201921948094U CN 211125532 U CN211125532 U CN 211125532U
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- circuit breaker
- shifting fork
- spring
- guide rod
- contact
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Abstract
The utility model relates to a link mechanism for a circuit breaker and a circuit breaker, which comprises a guide rod, wherein the guide rod is fixedly connected with a shell, and the shell is used for connecting a circuit breaker body; the automatic transmission device comprises a guide rod, a shifting fork, a transmission mechanism and a rotary mechanism, wherein the shifting fork is sleeved outside the guide rod and can perform reciprocating linear motion along the axis direction of the guide rod, the shifting fork is driven by the transmission mechanism, the input end of the transmission mechanism is connected with one end of a rotary shaft, the other end of the rotary shaft is connected with a knob, the output end of the transmission mechanism is connected with the shifting fork, and the transmission mechanism can convert the rotary motion at the knob into the linear motion of the shifting fork along the guide rod; the spring is arranged between the shifting fork and the shell, the spring sleeve is arranged outside the guide rod, and the spring can accumulate elastic potential energy in the process that a moving contact is in contact with a static contact in the shifting fork driving circuit breaker body and can drive the shifting fork to reset when the knob is loosened.
Description
Technical Field
The utility model belongs to the technical field of power equipment, concretely relates to link mechanism and circuit breaker for circuit breaker.
Background
The link mechanism for the circuit breaker is a mechanical mechanism for controlling a circuit breaker switch in a switch cabinet, and the common link mechanism for the circuit breaker is characterized in that: the knob is positioned on a cabinet door of the switch cabinet, the connecting rod mechanism is controlled through a rotating shaft connected with the knob, and the switching control of the circuit breaker is realized by utilizing a shifting fork at the tail end of the connecting rod mechanism, wherein the connecting rod mechanism is a transmission mechanism which converts rotary motion into linear motion.
The inventor considers that the prior circuit breaker link mechanism and the circuit breaker have the following defects:
the shifting fork in the existing circuit breaker link mechanism is contacted with a moving contact in a switch at any time, the friction force to be overcome when the shifting fork moves is increased along with the abrasion of the link mechanism, and when the circuit breaker is powered off, the friction force hinders the movement (tripping) of the switch of the circuit breaker; when the friction is large, the trip operation cannot be completed, thereby causing an accident.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the shortcoming of above-mentioned prior art, provide a link mechanism and circuit breaker for circuit breaker, can solve the tripping operation obstacle that the too big cause of frictional force among the circuit breaker link mechanism, avoid hindering the motion of moving contact in the position of circuit breaker tripping operation in-process shift fork, reduce accident probability.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a link mechanism for a circuit breaker comprises a guide rod, wherein the guide rod is fixedly connected with a shell, and the shell is used for connecting a circuit breaker body.
The outside cover of guide arm is equipped with the shift fork, the shift fork can carry out reciprocal linear motion along the axis direction of guide arm, the shift fork passes through the drive mechanism drive, drive mechanism's input is connected with the one end of pivot, the other end and the knob of pivot are connected, drive mechanism's output and shift fork are connected, drive mechanism can change the rotary motion of knob department into the linear motion of shift fork along the guide arm.
The spring is arranged between the shifting fork and the shell, the spring sleeve is arranged outside the guide rod, and the spring can accumulate elastic potential energy in the process that a moving contact is in contact with a static contact in the shifting fork driving circuit breaker body and can drive the shifting fork to reset when the knob is loosened.
Further, the positional relationship of the fork and the spring is set to: when the shifting fork moves towards the direction close to the spring, the shifting fork can drive the moving contact in the breaker body to move towards the static contact, and the spring can be compressed to accumulate elastic potential energy in the process that the moving contact approaches towards the static contact.
Further, the one end and the shell fixed connection of spring, the other end and shift fork fixed connection, the position relation of shift fork and spring is set up as: when the shifting fork moves towards the direction far away from the spring, the shifting fork can drive the moving contact in the breaker body to move towards the static contact, and the spring can be stretched to accumulate elastic potential energy in the process that the moving contact approaches towards the static contact.
Further, the spring is a conical spring.
Further, the transmission mechanism comprises a crank-link mechanism.
Furthermore, the direction of the central axis of the guide rod is parallel to the moving direction of the moving contact in the breaker body.
The utility model also provides a circuit breaker, include link mechanism for the circuit breaker, still include the circuit breaker body, be equipped with moving contact and static contact in the circuit breaker body, moving contact and static contact can form the route when the contact to realize the circulation of electric current in the circuit breaker body.
The utility model has the advantages that:
(1) the reset function of the shifting fork is realized by adopting a spring, and when the shifting fork moves under the driving of the transmission mechanism, the moving contact can be pushed to move towards the static contact so as to realize the closing of the circuit breaker; when the knob does not input torque, the spring can release elastic potential energy to drive the shifting fork to reset, the shifting fork and the moving contact are separated from contact at the moment, the moving contact cannot be prevented from moving towards the direction far away from the static contact by the friction force when the shifting fork moves, and then tripping is realized when needed.
(2) The conical spring is adopted, the compressibility of the conical spring is better under the condition of the same material, and if the spring needs to be compressed to obtain elastic potential energy, the spring adopting the conical structure can avoid the influence of the spring on the stroke of the shifting fork as much as possible, so that the shifting fork can obtain a larger stroke range; and further the distance between the shifting fork and the moving contact after the shifting fork is reset is increased.
(3) The crank connecting rod mechanism is adopted, so that the rotary motion at the knob can be converted into the linear motion of the shifting fork.
(4) The guide of the shifting fork movement can be realized by adopting a mode that the central axis of the guide rod is parallel to the moving direction of the moving contact.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a sectional view of a part of a structure in embodiment 2 of the present invention.
In the figure: 1. a circuit breaker body; 2. a housing; 3. a conical spring; 4. a rotating shaft; 5. a knob; 6. a shifting fork; 6A, a second U-shaped plate; 6B, a first U-shaped plate; 7. a guide bar; 8. a limiting bulge; 9. a box board.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up, down, left, right" in the present invention, if appearing, are intended to correspond only to the upper, lower, left, right directions of the drawings themselves, not to limit the structure, but merely to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
As described in the background art, a knob-type circuit breaker is easy to occur, the friction force to be overcome by the movement of the shifting fork 6 is large, and the moving contact and the static contact cannot be timely separated from each other, so that the circuit breaker cannot trip, and accidents are caused.
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 within a prescribed time. Wherein the knob 5 of the knob type circuit breaker is generally disposed outside the cabinet panel 9.
The circuit breaker generally has moving contact and static contact, can switch on the return circuit through the closing of moving contact and static contact, and when the electric current was too big in the circuit breaker, the magnetic force in the electro-magnet can drive moving contact and static contact and break away from the contact, forms the tripping operation.
Example 1
As shown in fig. 1, a part of the structure of the link mechanism for the circuit breaker in embodiment 1 includes a guide rod 7, and the guide rod 7 is fixedly connected to a housing, which is used for connecting the circuit breaker body 1.
The shifting fork 6 is sleeved outside the guide rod 7, the shifting fork 6 can perform reciprocating linear motion along the axis direction of the guide rod 7, the shifting fork 6 is driven by a transmission mechanism, the input end of the transmission mechanism is connected with one end of the rotating shaft 4, the other end of the rotating shaft 4 is connected with the knob 5, the output end of the transmission mechanism is connected with the shifting fork 6, and the transmission mechanism can convert the rotary motion at the position of the knob 5 into the linear motion of the shifting fork 6 along the guide rod 7;
the spring is arranged between the shifting fork 6 and the shell, the spring sleeve is arranged outside the guide rod 7, and the spring can accumulate elastic potential energy in the process that the moving contact and the static contact are in contact in the shifting fork 6 driving circuit breaker body 1 and can drive the shifting fork 6 to reset when the knob 5 is loosened.
It should be noted that in the present embodiment, the return of the shift fork 6 is realized by a spring, and the spring can accumulate elastic potential energy by compression or extension, so that:
in some embodiments, when the shifting fork 6 moves towards the direction of approaching the spring, the shifting fork 6 can drive the movable contact in the circuit breaker body 1 to move towards the fixed contact, and the spring can be compressed to accumulate elastic potential energy during the process of approaching the movable contact towards the fixed contact. In order to increase the compressibility of the spring, a conical spring 3 may be used.
In other embodiments, one end of the spring is fixedly connected with the housing, the other end of the spring is fixedly connected with the shifting fork 6, when the shifting fork 6 moves towards a direction away from the spring, the shifting fork 6 can drive the movable contact in the circuit breaker body 1 to move towards the fixed contact, and the spring can be stretched to accumulate elastic potential energy in the process that the movable contact approaches towards the fixed contact.
It should be noted that the conversion of the rotary motion of the knob 5 into the linear motion of the fork 6 by means of a transmission mechanism belongs to the prior art, and a crank-link mechanism is given as an example in this embodiment, and in other embodiments, other structural forms of transmission mechanisms may be adopted.
The direction of the central axis of the guide rod 7 is parallel to the moving direction of the moving contact in the breaker body 1.
The shifting fork 6 comprises a first U-shaped plate 6B and a second U-shaped plate 6A which are fixedly connected, the openings of the first U-shaped plate and the second U-shaped plate deviate from each other, and the second U-shaped plate is used for driving a moving contact in the circuit breaker body 1. Through holes are formed in two parallel plates in the first U-shaped plate respectively, the axes of the two through holes are overlapped, and the through holes are used for penetrating through the guide rods 7.
The working principle is as follows: in the initial state, the moving contact and the static contact are in a separation state, the moving contact is in contact with the shifting fork 6, the shifting fork 6 starts to move along the guide rod 7 by rotating the knob 5 along the pre-designed direction, and the moving contact is pushed to move towards the static contact when the shifting fork 6 moves until the moving contact and the static contact are attracted.
When the moving contact and the static contact are attracted, the circuit is conducted, the moving contact and the static contact are kept in an attraction state through self-locking, and then the two hands of an operator are separated from the knob 5. The spring drives the shifting fork 6, the transmission mechanism and the knob 5 to reset. The shifting fork 6 is separated from the moving contact.
When the current in the circuit breaker is overlarge, the magnetic force of the built-in electromagnet can overcome the self-locking force for keeping the moving contact and the fixed contact in order to protect the circuit. The static contact breaks away from the moving contact, and the circuit breaker realizes tripping.
When the circuit breaker trips, the shifting fork 6 is separated from the moving contact, so that the action process of tripping cannot be influenced by the friction force to be overcome when the shifting fork 6 moves.
Example 2
As shown in fig. 1, a circuit breaker includes the link mechanism for circuit breaker and a circuit breaker body 1, a moving contact and a static contact are arranged in the circuit breaker body 1, and the moving contact and the static contact can form a passage when contacting, so as to realize the circulation of current in the circuit breaker body 1.
Set up spacing arch 8 in circuit breaker body 1, spacing arch 8 can restrict the motion range of shift fork 6 along guide arm 7.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (8)
1. The link mechanism for the circuit breaker is characterized by comprising a guide rod, wherein the guide rod is fixedly connected with a shell, and the shell is used for connecting a circuit breaker body;
the automatic transmission device comprises a guide rod, a shifting fork, a transmission mechanism and a rotary mechanism, wherein the shifting fork is sleeved outside the guide rod and can perform reciprocating linear motion along the axis direction of the guide rod, the shifting fork is driven by the transmission mechanism, the input end of the transmission mechanism is connected with one end of a rotary shaft, the other end of the rotary shaft is connected with a knob, the output end of the transmission mechanism is connected with the shifting fork, and the transmission mechanism can convert the rotary motion at the knob into the linear motion of the shifting fork along the guide rod;
the spring is arranged between the shifting fork and the shell, the spring sleeve is arranged outside the guide rod, and the spring can accumulate elastic potential energy in the process that a moving contact is in contact with a static contact in the shifting fork driving circuit breaker body and can drive the shifting fork to reset when the knob is loosened.
2. The link mechanism for a circuit breaker according to claim 1, wherein the positional relationship of the fork and the spring is set to:
when the shifting fork moves towards the direction close to the spring, the shifting fork can drive the moving contact in the breaker body to move towards the static contact, and the spring can be compressed to accumulate elastic potential energy in the process that the moving contact approaches towards the static contact.
3. The link mechanism for a circuit breaker according to claim 1, wherein one end of the spring is fixedly connected to the housing, and the other end is fixedly connected to a fork, and a positional relationship between the fork and the spring is set to:
when the shifting fork moves towards the direction far away from the spring, the shifting fork can drive the moving contact in the breaker body to move towards the static contact, and the spring can be stretched to accumulate elastic potential energy in the process that the moving contact approaches towards the static contact.
4. The link mechanism for a circuit breaker according to claim 2, wherein said spring is a conical spring.
5. The link mechanism for a circuit breaker of claim 1 wherein said transmission mechanism comprises a crank link mechanism.
6. The link mechanism for a circuit breaker according to claim 1, wherein a direction of a central axis of the guide rod is parallel to a moving direction of the movable contact in the circuit breaker body.
7. The link mechanism for the circuit breaker as claimed in claim 1, wherein the fork includes a first U-shaped plate and a second U-shaped plate fixedly connected to each other, the openings of the first U-shaped plate and the second U-shaped plate are disposed away from each other, and the second U-shaped plate is used for driving a movable contact in the circuit breaker body;
through holes are formed in two parallel plates in the first U-shaped plate respectively, the axes of the two through holes are overlapped, and the through holes are used for penetrating through the guide rod.
8. A circuit breaker, comprising the link mechanism for circuit breaker as claimed in any one of claims 1-7, further comprising a circuit breaker body, wherein the circuit breaker body is provided with a moving contact and a static contact, and the moving contact and the static contact can form a passage when contacting to realize the circulation of current in the circuit breaker body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948094.XU CN211125532U (en) | 2019-11-11 | 2019-11-11 | Link mechanism for circuit breaker and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921948094.XU CN211125532U (en) | 2019-11-11 | 2019-11-11 | Link mechanism for circuit breaker and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211125532U true CN211125532U (en) | 2020-07-28 |
Family
ID=71697570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921948094.XU Active CN211125532U (en) | 2019-11-11 | 2019-11-11 | Link mechanism for circuit breaker and circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211125532U (en) |
-
2019
- 2019-11-11 CN CN201921948094.XU patent/CN211125532U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: A203, block F-1, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee after: Conway Communication Technology Co., Ltd Address before: A203, block F-1, Qilu Software Park, No.1 Shunhua Road, high tech Development Zone, Jinan City, Shandong Province Patentee before: SHANDONG KANGWEI COMMUNICATION TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |