CN112582226A - Latching mechanism of circuit breaker - Google Patents
Latching mechanism of circuit breaker Download PDFInfo
- Publication number
- CN112582226A CN112582226A CN201910956501.XA CN201910956501A CN112582226A CN 112582226 A CN112582226 A CN 112582226A CN 201910956501 A CN201910956501 A CN 201910956501A CN 112582226 A CN112582226 A CN 112582226A
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- China
- Prior art keywords
- lever
- shaft
- latching
- circuit breaker
- latch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention provides a latching mechanism of a circuit breaker, which comprises a pair of side plates, a cam shaft arranged between the pair of side plates, a latching assembly and a closing half shaft, wherein the latching assembly comprises a lever, a first shaft fixed on the lever, a shaft sleeve rotating on the first shaft, a lever fulcrum shaft rotating between the pair of side plates, a connecting rod, a latching lever and a latching lever fulcrum shaft rotating between the pair of side plates. The closing tripping system of the latching mechanism of the circuit breaker provided by the invention adopts a five-stage connecting rod structure (an energy storage lever component, a cam shaft, a lever, a connecting rod and a latching lever) in the energy storage and closing processes, can effectively reduce the stress condition of relevant parts of the latching component, and achieves remarkable technical effect.
Description
Technical Field
The invention relates to the field of low-voltage electrical appliances, in particular to an operating mechanism of a circuit breaker.
Background
The circuit breaker is used as a power distribution equipment and plays a role of protecting electric equipment in a power grid, namely, when a fault occurs in the power grid, such as short-circuit current or fault current, the circuit breaker breaks the current so as to protect the electric equipment and personnel safety in the power grid. In order to realize the protection function, an operating mechanism is arranged in the circuit breaker, the moving contact and the static contact of the circuit breaker can be separated by controlling the movement of parts in the operating mechanism, so that a circuit is cut off, and the latch mechanism is an important transmission control part in the operating mechanism.
With the improvement of the performance index of the circuit breaker, the requirement on an operating mechanism is higher and higher. And operating mechanisms in the industry are seriously homogenized and lack novelty. Meanwhile, the existing operating mechanism generally has the following defects:
the closing tripping system of the mechanism adopts a three-level connecting rod structure in the energy storage and closing processes, and the problems of large stress and easy failure after fatigue exist in related parts in the closing tripping system, and are specifically embodied as follows:
1. the lock catch lever adopts a single piece due to space reasons, the parts are thin and long, the lock catch lever is very stressed due to the fact that the energy storage spring force passes through a three-level connecting rod (an energy storage lever assembly, a cam assembly and the lock catch lever) of the closing tripping system, and the lock catch lever is easy to damage after being stressed due to fatigue;
2. the lock catch lever in the closing tripping system only has one fulcrum shaft, and the fulcrum shaft is fixed on the unilateral side plate, and the fulcrum shaft of the lock catch lever is easy to damage after fatigue stress;
3. the cam roller shaft is thin due to space, and the cam roller shaft is very stressed due to the three-level connecting rod structure and is easy to damage after being stressed due to fatigue.
Disclosure of Invention
In order to solve the technical problems, the invention provides a latching mechanism of a circuit breaker, wherein a switching-on tripping system of the latching mechanism adopts a five-stage connecting rod structure in the processes of energy storage and switching-on, so that the stress condition of related parts of a latching assembly can be effectively reduced.
In order to achieve the above object, the present invention provides a latch mechanism of a circuit breaker, including a pair of side plates, a cam shaft disposed between the pair of side plates, a latch assembly, and a closing half shaft, where the latch assembly includes a lever, a first shaft fixed to the lever, a shaft sleeve rotating on the first shaft, a lever fulcrum shaft rotating between the pair of side plates, a connecting rod, a latch lever, and a latch lever fulcrum shaft rotating between the pair of side plates.
Further, the cam shaft includes a cam shaft end portion axial surface that rotates between the pair of side plates, a cam cantilever snap surface that detachably contacts the shaft sleeve of the latch assembly.
Furthermore, the one end of the lever of hasp subassembly with the one end of connecting rod is articulated, the lever winds lever fulcrum axle rotates, the other end of connecting rod with the one end of hasp lever is articulated, another terminal surface of hasp lever with the separable contact of combined floodgate semi-axis's outer profile surface, the hasp lever winds hasp lever fulcrum axle rotates, and is in combined floodgate semi-axis rotates the back, the cambered surface of hasp lever can slide in the notch of combined floodgate semi-axis.
Further, the line of action of the drive force generated by the camshaft cantilever snap facing the lever is X1, and the line of action X1 is between the lever fulcrum shaft and the latch lever fulcrum shaft.
Further, the action line of a driving force generated by the lever through the connecting rod is X2, and the action line is between the closing half shaft and the latch lever fulcrum shaft.
Further, the first spring is mounted on the latch lever fulcrum shaft.
Further, the second spring is installed on the closing half shaft.
Further, the spring is a torsion spring.
Further, the second spring is a torsion spring.
The closing tripping system of the latching mechanism of the circuit breaker provided by the invention adopts a five-stage connecting rod structure in the processes of energy storage and closing, can effectively reduce the stress condition of relevant parts of the latching assembly, and achieves the following technical effects:
1. the closing tripping system adopts a five-stage connecting rod structure (namely, an energy storage lever assembly, a cam shaft, a lever, a connecting rod and a lock catch lever), the stress of the lock catch lever of the lock catch assembly transmitted by the energy storage spring force through the five-stage connecting rod is very small, the fatigue resistance is enhanced, and the service life of parts such as the lock catch lever is effectively prolonged;
2. the lock catch component is provided with two fulcrum shafts, and the two fulcrum shafts rotate on the two side plates, so that the stress of a single fulcrum shaft is reduced, and the service life of the fulcrum shaft is prolonged;
3. the roller shaft is changed from the cam to the lock catch component, and the space is enlarged, so that the service life of the roller shaft is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a latch mechanism of a circuit breaker in an energy storage state of an operating mechanism according to the present invention.
Fig. 2 is a schematic structural diagram of a latch mechanism of a circuit breaker in a state of an energy releasing process of an operating mechanism according to the present invention.
Fig. 3 is a schematic structural diagram of a latch mechanism of a circuit breaker in a state where the release of the operating mechanism is completed.
Fig. 4 is a schematic view of a camshaft structure of an operating mechanism of a circuit breaker according to the present invention.
Fig. 5 is a schematic view of a latch assembly of an operating mechanism of a circuit breaker according to the present invention.
Fig. 6 is a schematic structural diagram of a closing half shaft of an operating mechanism of a circuit breaker according to the present invention.
Description of reference numerals:
1: a side plate; 101: a first fixed shaft; 2: a camshaft; 2 a: a camshaft end axial surface; 2 b: the outer contour of the cam sheet; 2 c: the outer circle surface of the camshaft cantilever; 2 d: a camshaft cantilever buckle surface; 3: a latch assembly; 31: a lever; 311: a lever plate; 312: a lever fulcrum shaft; 313: a first shaft; 314: a shaft sleeve; 315: a shaft pin; 32: a connecting rod; 321: a connecting rod piece; 322: a second shaft; 323: a third shaft; 33: a latch lever; 331: a locking lever piece; 331 a: the locking lever surface; 331 b: a latch lever arc surface; 332: a latch lever fulcrum shaft; 4: a first spring; 5: a second spring; 6: a switching-on half shaft; 6 a: a closing half shaft outer contour surface; 6 b: closing a half shaft notch; 6 c: closing half shaft limit shaft.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 3, in this embodiment, a latch mechanism of a circuit breaker of the present invention includes: the cam shaft locking mechanism comprises a pair of side plates 1, a cam shaft 2 arranged between the pair of side plates 1, a locking assembly 3, a first spring 4, a second spring 5 and a closing half shaft 6. The pair of side plates 1 are fixedly connected through a first fixed shaft 101 or other fixed shafts. The camshaft 2 includes a camshaft end axial surface 2a, a cam suspension arm fastening surface 2b, and a cam suspension arm outer circumferential surface 2c that rotate between the pair of side plates 1. Both end axial surfaces 2a of the camshaft 2 are provided on the pair of side plates 1 and are rotatable thereabout.
Referring to fig. 5, the latch assembly 3 includes a lever 31, a link 32, and a latch lever 33. The lever 31 is fixed by two lever pieces 311 through a second shaft pin 315, the two lever pieces 311 rotate on a fulcrum shaft 312, and the fulcrum shaft 312 rotates on the pair of side plates 1. The first shaft 313 is fixed on the two lever pieces 311, the shaft sleeve 314 is arranged on the first shaft 313 and can rotate, and the shaft sleeve 314 is arranged between the two lever pieces 311. The two lever pieces 311 are hinged to one ends of the two link pieces 321 through a second shaft 322, and the two lever pieces 311 are arranged outside the two link pieces 321. The latch lever 33 includes a latch lever piece 331 and a latch lever fulcrum shaft 332, the latch lever fulcrum shaft 332 being fixed to the latch lever piece 331, the latch lever fulcrum shaft 332 being rotatable on the pair of side plates 1. The other end of the two link plates 321 is hinged with one end of the locking lever plate 331 through a third shaft 323.
In this embodiment, the first spring 4 is a torsion spring, which is installed on the fulcrum shaft 332 of the latch lever to generate clockwise torque to the latch lever 33, and thus, the installation is convenient and effective. The second spring 5 is also a torsion spring and is arranged on the closing half shaft 6 to generate clockwise torsion (restoring force) for the closing half shaft 3, and the second spring also has a better technical effect.
The surface 331a of the latch lever 33 is in separable contact with the outer contoured surface 6a of the closing half shaft 68 (see fig. 6), and the restraining shaft 6c of the closing half shaft 6 is in separable contact with features in the side plate 1. When the locking lever 33 rotates around the locking lever fulcrum shaft 332 and the closing half shaft 3 rotates on the pair of side plates 1, the arc surface 331b of the locking lever 33 can slide in the notch 6b of the closing half shaft 6.
As shown in fig. 1, in the energy storage state of the latch mechanism operating mechanism of the circuit breaker, the cam shaft 2 tends to rotate clockwise, the cam shaft cantilever fastening surface 2b contacts the bushing 314, the cam shaft cantilever fastening surface 2b generates a driving force to the lever 31, the driving force acts on the line X1, the line X1 is between the lever fulcrum shaft 312 and the latch lever fulcrum shaft 332, and the driving force tends to rotate the lever 31 clockwise around the lever fulcrum shaft 312. The lever 31 generates a driving force through the link 32, the driving force having a line of action X2, the line of action X2 being between the closing half shaft 6 and the latch lever fulcrum shaft 332, the driving force tending to rotate the latch lever 33 counterclockwise about the latch lever fulcrum shaft 332. The locking lever face 331a contacts the outer contour face 6a of the closing half shaft 6, and the closing half shaft 6 blocks the locking lever 33 from rotating counterclockwise.
Referring again to fig. 1 to 3, the energy release process of the operating mechanism provided with the latch mechanism of the circuit breaker of the present invention is as follows: when the closing half shaft 6 rotates anticlockwise, the locking lever 33 of the locking assembly 3 rotates anticlockwise around the locking lever fulcrum shaft 332, the locking arc surface 331b slides into the notch 6b of the closing half shaft 6, the locking assembly 3 is folded, the lever 31 rotates clockwise around the lever fulcrum shaft 312, the lever 31 stops rotating after contacting with the fixed shaft 101, the cam cantilever fastening surface 2b of the camshaft 2 is separated from the shaft sleeve 314 of the locking assembly 3, and the camshaft 2 rotates clockwise. This state is the state of the energy release process, as shown in FIG. 2. The locking lever 33 rotates clockwise under the torsion of the first spring 4, the locking assembly 3 is folded, the shaft sleeve 314 is contacted with the cantilever outer circular surface 2c of the camshaft, the closing half shaft 6 rotates clockwise under the torsion of the second spring 5, and the closing half shaft 6 is contacted with the locking lever cambered surface 331 b. This state is the release completion state.
As can be seen from the above description, the latching mechanism of the circuit breaker provided by the present invention adopts the five-stage link structure in the energy storage and closing processes of the circuit breaker, which can effectively reduce the stress of the related parts of the latching assembly, and is specifically embodied as follows:
1. the closing tripping system adopts a five-stage connecting rod structure (an energy storage lever assembly, the cam shaft 2, the lever 31, the connecting rod 32 and the lock catch lever 33), the stress is very small when the energy storage spring force is transmitted to the lock catch lever 33 of the lock catch assembly 3 through the five-stage connecting rod, the fatigue resistance is enhanced, and the service life of parts such as the lock catch lever is effectively prolonged;
2. the lock catch component is provided with two fulcrum shafts, and the two fulcrum shafts rotate on the two side plates, so that the stress of a single fulcrum shaft is reduced, and the service life of the fulcrum shaft is prolonged;
3. the roller shaft is changed from the cam to the lock catch component, and the space is enlarged, so that the service life of the roller shaft is prolonged.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The latching mechanism of the circuit breaker is characterized by comprising a pair of side plates, a cam shaft (2) arranged between the pair of side plates (1), a latching assembly (3) and a closing half shaft (6), wherein the latching assembly (3) comprises a lever (31), a first shaft (313) fixed on the lever (31), a shaft sleeve (314) rotating on the first shaft (313), a lever fulcrum shaft (312) rotating between the pair of side plates (1), a connecting rod (32), a latching lever (33) and a latching lever fulcrum shaft (332) rotating between the pair of side plates (1).
2. A circuit breaker latch mechanism according to claim 1 wherein the cam shaft (2) comprises a cam shaft end shaft surface (2a) rotatable between a pair of side plates (1), a cam cantilever catch surface (2b), the cam cantilever catch surface (2b) being in separable contact with the shaft sleeve (314) of the latch assembly (3).
3. A latching mechanism for a circuit breaker according to claim 1, characterized in that one end of the lever (31) of the latching assembly (3) is hinged to one end of the link (32), the lever (31) rotates around the lever fulcrum shaft (312), the other end of the link (32) is hinged to one end of the latching lever (33), the other end face (331a) of the latching lever (33) is detachably contacted to the outer contour face (6a) of the closing half shaft (6), the latching lever (33) rotates around the latching lever fulcrum shaft (332), and the arc face (331b) of the latching lever (33) can slide in the slot (6b) of the closing half shaft (6) after the closing half shaft (6) rotates.
4. The latch mechanism for circuit breakers of claim 2 wherein said cam shaft cantilevered latch surface (2b) applies a line of action to the drive force generated by said lever (31) of X1 and said line of action X1 is between said fulcrum shaft (312) and said latch fulcrum shaft (332).
5. A latching mechanism for a circuit breaker according to claim 2 wherein the lever (31) via the link (32) generates a line of action of the driving force X2, the line of action X2 being between the closing half shaft (6) and the latch lever fulcrum shaft (332).
6. A latching mechanism for a circuit breaker according to claim 1 wherein a first spring (4) is mounted on said latch lever fulcrum shaft (332).
7. A latching mechanism for a circuit breaker according to claim 1, characterized in that the second spring (5) is mounted on the closing half shaft (6).
8. A latch mechanism for a circuit breaker according to claim 6 in which the first spring (4) is a torsion spring.
9. A latch mechanism for a circuit breaker according to claim 7 in which the second spring (5) is a torsion spring.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956501.XA CN112582226A (en) | 2019-09-30 | 2019-09-30 | Latching mechanism of circuit breaker |
| PCT/CN2019/118733 WO2021062922A1 (en) | 2019-09-30 | 2019-11-15 | Locking mechanism of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956501.XA CN112582226A (en) | 2019-09-30 | 2019-09-30 | Latching mechanism of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112582226A true CN112582226A (en) | 2021-03-30 |
Family
ID=75116962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910956501.XA Pending CN112582226A (en) | 2019-09-30 | 2019-09-30 | Latching mechanism of circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112582226A (en) |
-
2019
- 2019-09-30 CN CN201910956501.XA patent/CN112582226A/en active Pending
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