CN117936333A - Direct current moulded case circuit breaker contact structure - Google Patents
Direct current moulded case circuit breaker contact structure Download PDFInfo
- Publication number
- CN117936333A CN117936333A CN202211265724.XA CN202211265724A CN117936333A CN 117936333 A CN117936333 A CN 117936333A CN 202211265724 A CN202211265724 A CN 202211265724A CN 117936333 A CN117936333 A CN 117936333A
- Authority
- CN
- China
- Prior art keywords
- moving contact
- contact
- circuit breaker
- direct current
- case circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003068 static effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
- H01H71/02—Housings; Casings; Bases; Mountings
-
- 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
- H01H71/08—Terminals; Connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/06—Housings; Casings; Bases; Mountings
Landscapes
- Breakers (AREA)
Abstract
The invention relates to a direct current molded case circuit breaker contact structure, which comprises a rotating shaft (1), a moving contact (3) and a fixed contact (6), wherein a fine adjustment screw assembly (2) is arranged on the rotating shaft (1), the fine adjustment screw assembly (2) is positioned above the moving contact (3) and is contacted with the moving contact (3), and the distance between the moving contact (3) and the fixed contact (6) is changed by adjusting the relative position between the fine adjustment screw assembly (2) and the rotating shaft (1), so that the opening distance of the moving contact (3) is finely adjusted. The invention provides a direct current plastic shell circuit breaker contact structure for improving the synchronism of each breaking point of a direct current circuit breaker and the breaking capacity of the circuit breaker.
Description
Technical Field
The invention relates to the technical field of piezoelectric devices, in particular to a contact structure of a direct current plastic shell breaker.
Background
A circuit breaker is a switching device capable of closing, carrying and breaking a current under normal circuit conditions and capable of closing, carrying and breaking a current under abnormal circuit conditions for a prescribed time. The circuit breaker is divided into a high-voltage circuit breaker and a low-voltage circuit breaker according to the application range, the low-voltage plastic shell circuit breaker is widely applied to a low-voltage distribution system, the circuit breaker is provided with double tasks of protecting and controlling a circuit, and the circuit breaker plays a vital role in the safety, reliability and practicability of the whole circuit system.
Most of the existing direct current plastic shell circuit breakers adopt a multi-breakpoint series connection mode, so that the direct current breaking capacity and reliability are improved, the requirement on the synchronism of breakpoints is very high, if a certain breakpoint is firstly broken to generate an electric arc, the break point which is firstly broken will bear full voltage and full current, the damage to a contact is greatly increased, and the breaking capacity of the circuit breaker is greatly reduced. The prior art can only improve the synchronism among the break points as much as possible by the manufacturing precision and the assembly precision of the parts, has limited effect and higher cost, and increases the quality management difficulty.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a direct current plastic shell breaker contact structure for improving the synchronism of each breaking point of the direct current breaker and the breaking capacity of the breaker.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a direct current moulded case circuit breaker contact structure, includes the pivot, moving contact and stationary contact are equipped with the fine setting screw subassembly in the pivot, the fine setting screw subassembly is located the moving contact top, contacts with the moving contact, and through the relative position between adjustment fine setting screw subassembly fine setting moving contact and the pivot, the distance between change moving contact and the stationary contact to the opening of fine setting moving contact.
Further, a moving contact rotating shaft and a moving contact torsion spring are arranged in the rotating shaft, the moving contact is rotatably arranged on the rotating shaft through the moving contact rotating shaft, the moving contact torsion spring provides anticlockwise torque for the moving contact, and the fine adjustment screw assembly contacts with the tail end of the moving contact to provide clockwise torque for the moving contact.
Further, the fine adjustment screw component and the moving contact rotating shaft are arranged in a staggered mode.
Further, the trim screw assembly includes an adjustment screw, a nut, and a threaded insert.
Further, the embedded nut is arranged in the rotating shaft, threads are arranged in the embedded nut, and the adjusting screw is inserted into the embedded nut and moves up and down through the threads in the embedded nut.
Further, the nut is arranged at the top of the adjusting screw and used for fixing the feeding amount of the adjusting screw screwed into the rotating shaft.
Further, the tail end of the adjusting screw is provided with an adjusting screw spherical surface, and the upper end of the movable contact is a movable contact adjusting surface.
Further, the sphere diameter of the sphere of the adjusting screw is the same as the diameter of the adjusting screw.
Further, the spherical surface of the adjusting screw is always in contact with the adjusting surface of the moving contact in the rotating process of the moving contact, and the adjusting screw moves up and down to drive the spherical surface of the adjusting screw to move up and down, so that the rotating angle of the moving contact is limited, the relative position between the moving contact and the fixed contact is changed, and the opening distance of the circuit breaker is finely adjusted.
Further, the fixed contact is arranged on one side of the moving contact, and the fine adjustment screw assembly is arranged on the other side of the moving contact and is located on the same plane with the moving track of the moving contact.
Compared with the prior art, the invention has the following advantages:
(1) The open-end fine adjustment of the direct current breaker can be realized through debugging, the synchronism of each breakpoint of the direct current breaker is improved, the direct current breaker is more reliable, and the breaking capacity of the breaker is increased.
(2) Compared with the mode of improving the synchronism by improving the tolerance level and the assembly precision of parts in the prior art, the invention has low cost and reduces the quality management difficulty.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a schematic diagram of the overall structure of the present invention;
FIG. 4 is a graph showing the voltage drop variation of the moving and static contacts before adjustment according to the present invention
FIG. 5 is a graph showing the voltage drop change of the moving and static contacts after adjustment according to the present invention
In the figure: 1. a rotating shaft; 2. a fine tuning screw assembly; 21. an adjusting screw; 22. a nut; 23. embedding a nut; 24. spherical surface of the screw; 3. a moving contact; 31. a moving contact adjusting surface 4 and a moving contact rotating shaft; 5. a moving contact torsion spring; 6. and (5) a static contact.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Examples
As shown in fig. 3, a contact structure of a direct current molded case circuit breaker comprises a rotating shaft 1, a moving contact 3 and a fixed contact 6, wherein a fine adjustment screw assembly 2 is arranged on the rotating shaft 1, the fine adjustment screw assembly 2 is positioned above the moving contact 3 and is in contact with the moving contact 3, the relative position between the moving contact 3 and the rotating shaft 1 is finely adjusted by adjusting the fine adjustment screw assembly 2, the distance between the moving contact 3 and the fixed contact 6 is changed, so that the moving contact 3 is finely adjusted, the fixed contact is arranged on one side of the moving contact 3, the fine adjustment screw assembly 2 is arranged on the other side of the moving contact 3, and the moving track of the fine adjustment screw assembly and the moving contact 3 are positioned on the same plane.
As shown in fig. 1, a moving contact rotating shaft 4 and a moving contact torsion spring 5 are arranged in the rotating shaft 1, the moving contact 3 is rotatably arranged on the rotating shaft 1 through the moving contact rotating shaft 4, the moving contact torsion spring 5 provides anticlockwise torque for the moving contact 3, the upper end of the moving contact 3 is a moving contact adjusting surface 31, and the fine adjustment screw assembly 2 is arranged above the moving contact 3, is in contact with the tail end of the moving contact adjusting surface 31 and is arranged in a staggered manner with the moving contact rotating shaft 4, so that clockwise torque is provided for the moving contact 3. As shown in fig. 2, the fine adjustment screw assembly 2 includes an adjustment screw 21, a nut 22 and a nut insert 23, the nut insert 23 is disposed in the rotating shaft 1, a screw thread is disposed in the nut insert 23, the adjustment screw 21 is inserted into the nut insert 23, and moves up and down through the screw thread in the nut insert 23, the nut insert 23 enables the adjustment screw 21 to move up and down along the rotating shaft of the adjustment screw 21 when rotating, the nut 22 is disposed at the upper end of the adjustment screw 21 for fixing the feeding amount of the adjustment screw 21, the end of the adjustment screw 21 is provided with an adjustment screw spherical surface 24 having the same diameter as the adjustment screw 21, the adjustment screw spherical surface 24 is always in contact with the moving contact adjustment surface 31 during the counterclockwise rotation of the moving contact 3, the up and down movement of the adjustment screw 21 drives the up and down movement of the adjustment screw spherical surface 24, thereby restricting the rotation angle of the moving contact 3, changing the relative position between the moving contact 3 and the fixed contact 6, and fine adjustment of the opening distance of the circuit breaker.
After the direct current molded case circuit breaker mechanism is partially assembled, the circuit breaker is connected to a test device, the direct current voltage is connected to the circuit breaker after closing, then the circuit breaker is manually tripped, waveforms of all break points in the process of breaking are checked, as shown in fig. 4, the horizontal axis is time, the vertical axis is voltage, voltage change curves of ABC three phases are sequentially arranged from top to bottom in the figure, voltage drop can be generated when the circuit breaker is broken, synchronism of all phases is adjusted according to the starting time point of voltage drop of each phase, in the embodiment, the breaking time point of a C phase before adjustment is obviously delayed to A, B two phases, a regulating screw 21 is screwed down, the breaking time point of the C phase break point is advanced, the circuit breaker is connected to the test device again after adjustment, waveforms of all break points in the process of breaking are checked, at the moment, the breaking time point of the C phase is advanced, the breaking time of the three phases is synchronous, and fine adjustment of a fine adjustment screw component (2) on the C phase is realized.
In summary, the invention provides the direct current plastic shell circuit breaker contact structure for improving the synchronism of each breaking point of the direct current circuit breaker and the breaking capacity of the circuit breaker.
Claims (10)
1. The utility model provides a direct current moulded case circuit breaker contact structure, includes pivot (1), moving contact (3) and static contact (6), its characterized in that is equipped with fine setting screw subassembly (2) on pivot (1), fine setting screw subassembly (2) are located moving contact (3) top, contact with moving contact (3), through the relative position between adjusting fine setting screw subassembly (2) fine setting moving contact (3) and pivot (1), change the distance between moving contact (3) and static contact (6) to fine setting moving contact (3) open-off.
2. The direct current molded case circuit breaker contact structure according to claim 1, wherein a moving contact rotating shaft (4) and a moving contact torsion spring (5) are arranged in the rotating shaft (1), the moving contact (3) is rotatably arranged on the rotating shaft (1) through the moving contact rotating shaft (4), the moving contact torsion spring (5) provides anticlockwise torque for the moving contact (3), and the fine adjustment screw assembly (2) is in contact with the tail end of the moving contact (3) to provide clockwise torque for the moving contact (3).
3. The direct current molded case circuit breaker contact structure according to claim 2, wherein the fine adjustment screw assembly (2) and the moving contact rotating shaft (4) are arranged in a staggered manner.
4. A direct current molded case circuit breaker contact structure according to claim 1, characterized in that the trimming screw assembly (2) comprises an adjusting screw (21), a nut (22) and a threaded insert (23).
5. The contact structure of a direct current molded case circuit breaker according to claim 4, wherein the insert nut (23) is provided in the rotary shaft (1), the insert nut (23) is internally provided with a screw thread, and the adjusting screw (21) is inserted into the insert nut (23) and moves up and down by the screw thread inside the insert nut (23).
6. The contact structure of the direct current molded case circuit breaker according to claim 4, wherein the nut (22) is installed at the top of the adjusting screw (21) for fixing the feeding amount of the adjusting screw (21) screwed into the rotating shaft (1).
7. The direct current molded case circuit breaker contact structure according to claim 4, wherein the tail end of the adjusting screw (21) is provided with an adjusting screw spherical surface (24), and the upper end of the moving contact (3) is a moving contact adjusting surface (31).
8. A direct current molded case circuit breaker contact structure according to claim 7, wherein the sphere diameter of the adjusting screw sphere (24) is the same as the diameter of the adjusting screw (21).
9. The direct current molded case circuit breaker contact structure according to claim 7, wherein the adjusting screw spherical surface (24) is always in contact with the moving contact adjusting surface (31) in the rotating process of the moving contact (3), and the up-and-down movement of the adjusting screw (21) drives the up-and-down movement of the adjusting screw spherical surface (24), so that the rotating angle of the moving contact (3) is limited, the relative position between the moving contact (3) and the fixed contact (6) is changed, and the opening distance of the circuit breaker is finely adjusted.
10. The contact structure of the direct current molded case circuit breaker according to claim 1, wherein the fixed contact is arranged on one side of the moving contact (3), and the fine adjustment screw assembly (2) is arranged on the other side of the moving contact (3) and is positioned on the same plane with the movement track of the moving contact (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211265724.XA CN117936333A (en) | 2022-10-17 | 2022-10-17 | Direct current moulded case circuit breaker contact structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211265724.XA CN117936333A (en) | 2022-10-17 | 2022-10-17 | Direct current moulded case circuit breaker contact structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117936333A true CN117936333A (en) | 2024-04-26 |
Family
ID=90767035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211265724.XA Pending CN117936333A (en) | 2022-10-17 | 2022-10-17 | Direct current moulded case circuit breaker contact structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117936333A (en) |
-
2022
- 2022-10-17 CN CN202211265724.XA patent/CN117936333A/en active Pending
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