CN201156497Y - Switching-on buffering mechanism in breaker - Google Patents
Switching-on buffering mechanism in breaker Download PDFInfo
- Publication number
- CN201156497Y CN201156497Y CNU2008200787765U CN200820078776U CN201156497Y CN 201156497 Y CN201156497 Y CN 201156497Y CN U2008200787765 U CNU2008200787765 U CN U2008200787765U CN 200820078776 U CN200820078776 U CN 200820078776U CN 201156497 Y CN201156497 Y CN 201156497Y
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- oil cylinder
- buffer oil
- screw rod
- underframe
- circuit breaker
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Abstract
The utility model relates to a closing buffer device in a breaker, which is characterized in that the device comprises an upper frame and a lower frame. A spring is fixedly connected between the upper frame and the lower frame; the top of the upper frame is fixed with an upper screw; the bottom of the lower frame is provided with a lower screw; the top of the lower screw is provided with a buffer oil cylinder which is fixedly connected with the lower frame through a screw thread; the upper end of the buffer oil cylinder goes through the upper frame and connected and positioned by a screw nut. A spacing plate is hanged on the upside of the buffer oil cylinder through a hanging device; the hanging device is fixed on a case body of the breaker. The lower screw and the lower frame can be fixedly integrated into a whole, or movably perforated, or directly inserted into the lower frame after being manufactured into a whole with the buffer oil cylinder. As the buffer oil cylinder arranged by the utility model can absorb impact kinetic energy, the closing of dynamic and static contacts are stable, thus being applicable to spreading to the design of other breakers.
Description
Technical field
The utility model relates to a kind of circuit breaker, particularly about the switching-on buffering mechanism in a kind of circuit breaker.
Background technology
For the essential industry load of protection sensitiveness is avoided interference in short-term from electric power system; as the jump influence of phenomenon of electric voltage dropping and voltage; and the quality of power supply that improves electric power system, needing protection property device such as primary cut-out have very high-speed close, opening characteristic.The closing speed scope of spring operating mechanism, electromagnetic operating mechanism, permanent-magnet manipulating mechanism or hydraulic actuating mechanism that present primary cut-out generally adopts is 0.4m/s～0.6m/s, the opening velocity scope is 0.8m/s～1.0m/s, the closing time scope is 40ms～60ms, the opening time scope is 20ms～40ms, be difficult to reach fast close, the requirement of separating brake.
Present a kind of novel high pressure Fast Speed Vacuum Circuit Breaker that is equipped with the electromagnetic repulsion force operating mechanism, its closing speed is 1.6m/s～2.0m/s, and opening velocity is 2.8m/s～3.0m/s, and closing time is smaller or equal to 6ms, opening time is smaller or equal to 2ms, realized the closing fast of circuit breaker, separating brake.Because it is that speed is exceedingly fast that high speed circuit breaker is different from the outstanding feature of normal circuit breaker, so inevitable dynamic and static contact time of contact in making process, moving component can produce huge impact to stationary parts, produce closing rebound, the performance of circuit breaker and the power consumption equipment in life-span and the electrical network are caused serious harm.For remedying above-mentioned defective, just need analyze combined floodgate course of action and energy distribution, find out rational solution.
Summary of the invention
At above problem, the purpose of this utility model provides a kind of breaker closing impact that is used to reduce, and suppresses the buffer unit of closing rebound.
For achieving the above object, the utility model is taked following technical scheme: the switching-on buffering mechanism in a kind of circuit breaker, it is characterized in that: it comprises a upper frame and a underframe, a fixedly connected spring between described upper frame and underframe, fix screw rod at the top of described upper frame, screw rod once is set in the bottom of described underframe; At described screw rod top down one buffer oil cylinder is set, described buffer oil cylinder is fixedly connected on the described underframe by screw thread; Described upper frame is passed in the upper end of described buffer oil cylinder, connects the location by a nut; One limiting plate hangs the top that is located at described buffer oil cylinder by an erecting by overhang, and described erecting by overhang is fixed on the circuit breaker casing.
Described down screw rod can be fixedlyed connected with described underframe and is integral.
Described screw rod down slides and is located in the described underframe, and described buffer oil cylinder is sitting in described screw rod top down.
Described down screw rod slides and is located in the described underframe, and fixedlys connected with described buffer oil cylinder and to be integral.
The utility model is owing to take above technical scheme, and it has the following advantages: 1, the utility model is owing to merge into a construction unit with buffer oil cylinder and two functional units of spring, designs ingenious, novel structure, saved the space.2, the utility model has been realized axial buffer owing to be provided with a buffer oil cylinder in spring assembly, cushion more direct, more steady, the inclination of moving contact when having avoided the side direction installation.3, the utility model has absorbed part kinetic energy because the buffer oil cylinder has produced cushioning effect in the process of moving upward, so reduced the impact to stationary parts, has suppressed closing rebound, has realized steady combined floodgate.4, of the present utility model owing to be provided with spring assembly, therefore the reliable contact for dynamic and static contact provides confining force.The utility model can be widely used in the circuit breaker.
Description of drawings
Fig. 1 is an example structure schematic diagram of the utility model contact spring arrangement
Fig. 2 is that the utility model contact spring arrangement is arranged on the schematic diagram in the high speed circuit breaker
Embodiment
Below in conjunction with drawings and Examples the utility model is described in detail.
The physical phenomenon of dynamic and static contact time of contact during at breaker closing, and learn from the angle analysis of power conversion and distribution:
1, Fast Speed Vacuum Circuit Breaker is when closing operation, because closing speed is very fast, moving contact and moving component reduction are very big to the kinetic energy W at moving contact place, this energy converts three parts to after moving contact and fixed contact collision, kinetic energy Wt when being collision loss Wp, touch spring compression back energy storage Ws and contact bounce, that is:
W＝Wp+Ws+Wt (1)
Kinetic energy Wt during contact bounce consumes gradually along with the spring amplitude fading, until being exhausted.Wt is big more, and the bounce time that means is long more, has then quickened the wearing and tearing of contact within the specific limits, thereby causes the shortening of circuit breaker electrical endurance, so control and reduction closing rebound are very important.
2, as can be known, the size of circuit breaker kinetic energy when closing a floodgate is by the kinetic energy operational formula:
W＝mV
2/2 (2)
Moving contact and moving component reduction were to the quality at moving contact place when m was closing operation in the formula, the instantaneous velocity of moving contact when V is the contact collision, obviously when the closing speed of high speed circuit breaker was about 4 times of normal circuit breaker, the kinetic energy that then closes a floodgate was about 16 times of normal circuit breaker.By formula (1) as can be known, control in advance and reduce Wt and then must improve Wp+Ws to 16 times.
3, collision loss Wp mainly is because the contact collision produces deformation loss, and the now vacuum circuit-breaker is ablated for guaranteeing mechanical endurance and tolerance electricity, and the mechanical strength of contact design is very high, so Wp can't increase substantially.
4, the energy storage Ws after the touch spring compression is:
Ws＝kH
2/2 (3)
K is a coefficient of elasticity in the formula, and H is the touch spring compression travel.As increase H, and then can in the process that discharges H, consume the too much time, can't guarantee the characteristic of quick acting switching-off, so the H value is unsuitable excessive; And the k value also can't significantly be improved by technology and size restrictions.
In sum, control in advance and reduce Wt, can't solve by increasing Wp+Ws substantially, only before the dynamic/static contact collision, reduce total combined floodgate kinetic energy W and be only possibility.Obtain by the process of analyzing dynamic and static contact time of contact power conversion and distribution, only before closing moment, absorb most of energy if will reduce to impact the infringement that causes, thereby reduce total combined floodgate kinetic energy W.Therefore, be chosen on the contact spring structure basis of prior art, increase buffer device.
As shown in Figure 1, the utility model comprises a upper frame 1 and a underframe 2, and a fixedly connected spring 3 between upper frame 1 and underframe 2 is fixed screw rod 4 at the top of upper frame 1, wears screw rod 5 in the bottom of underframe 2.Spring 3 is passed in the lower end of one buffer oil cylinder 6 to be sitting in down on the screw rod 5 and by screw thread and to be fixedly connected on the underframe 2.Upper frame 1 is passed in the upper end of buffer oil cylinder 6, connects the location by a nut 7.One limiting plate 8 hangs the top that is located at buffer oil cylinder 6 by an erecting by overhang 9, erecting by overhang 9 is a rigid hanger, be fixed on that circuit breaker casing 10 (as shown in Figure 2) is gone up or other servicing unit on, when upper frame 1 upper and lower motion, erecting by overhang 9 does not influence its motion.
In the foregoing description, following screw rod 5 can be fixedlyed connected with underframe 2 and is integral; Following screw rod 5 also can wear in activity; Following screw rod 5 can also be made into one with buffer oil cylinder 6, directly is plugged in the underframe 2 also fixing.
As shown in Figure 2, before the utility model uses, elder generation's adjusting nut 7, execute a precompression for spring 3, piston rod 11 in the buffer oil cylinder 6 is complete release or half depressurization phase, then the utility model vertically is placed in the high speed circuit breaker casing 10 trigger device 12 of last screw rod 4 fixedly connected circuit breakers, the driving mechanism 13 of following screw rod 5 fixedly connected circuit breakers.During work, after system sends the order of closing a floodgate, driving mechanism 13 provides an actuating force that makes progress, promoting down, screw rod 5 moves upward, drive underframe 2 thus and buffer oil cylinder 6 moves upward together, compressing spring 3 drive upper frames 1 simultaneously moves upward, in buffer oil cylinder 6 moves upward process, when piston rod 11 is run into limiting plate 8, stop motion, and buffer oil cylinder 6 is still moving upward at this moment, so the liquid in the piston rod 10 meeting compression cylinders, produce cushioning effect, absorption portion kinetic energy.At this moment, the moving upward of upper frame 1 makes the trigger device 12 and the static contact head device 14 of the circuit breaker of its top realize steadily closing a floodgate, upper frame 1 stop motion this moment, and underframe 2 still moves upward continuing, compression spring 3, therefore the reliable contact for dynamic and static contact provides confining force.When carrying out sub-switching operation, screw rod 5 moved downward under driving mechanism 13 drove, and spring 3 discharges its elastic potential energys, can help to improve opening velocity.
Claims (4)
1, the switching-on buffering mechanism in a kind of circuit breaker, it is characterized in that: it comprises a upper frame and a underframe, a fixedly connected spring is fixed screw rod at the top of described upper frame between described upper frame and underframe, in the bottom of described underframe screw rod once is set; At described screw rod top down one buffer oil cylinder is set, described buffer oil cylinder is fixedly connected on the described underframe by screw thread; Described upper frame is passed in the upper end of described buffer oil cylinder, connects the location by a nut; One limiting plate hangs the top that is located at described buffer oil cylinder by an erecting by overhang, and described erecting by overhang is fixed on the circuit breaker casing.
2, the switching-on buffering mechanism in a kind of circuit breaker as claimed in claim 1 is characterized in that: described down screw rod is fixedlyed connected with described underframe and is integral.
3, the switching-on buffering mechanism in a kind of circuit breaker as claimed in claim 1 is characterized in that: described screw rod down slides and is located in the described underframe, and described buffer oil cylinder is sitting in described screw rod top down.
4, the switching-on buffering mechanism in a kind of circuit breaker as claimed in claim 1 is characterized in that: described down screw rod slides and is located in the described underframe, and fixedlys connected with described buffer oil cylinder and to be integral.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200787765U CN201156497Y (en) | 2008-01-28 | 2008-01-28 | Switching-on buffering mechanism in breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200787765U CN201156497Y (en) | 2008-01-28 | 2008-01-28 | Switching-on buffering mechanism in breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201156497Y true CN201156497Y (en) | 2008-11-26 |
Family
ID=40104274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200787765U Expired - Lifetime CN201156497Y (en) | 2008-01-28 | 2008-01-28 | Switching-on buffering mechanism in breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201156497Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960738A (en) * | 2017-04-27 | 2017-07-18 | 南京南瑞继保电气有限公司 | A kind of high-speed circuit breaker mixed type buffer |
| CN110444440A (en) * | 2019-08-16 | 2019-11-12 | 河南省三禾电气有限公司 | A kind of pole-mounted circuit breaker |
| CN111025140A (en) * | 2019-12-27 | 2020-04-17 | 国网山西省电力公司电力科学研究院 | Method for improving opening speed of breaker model based on spring assistance |
-
2008
- 2008-01-28 CN CNU2008200787765U patent/CN201156497Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960738A (en) * | 2017-04-27 | 2017-07-18 | 南京南瑞继保电气有限公司 | A kind of high-speed circuit breaker mixed type buffer |
| CN110444440A (en) * | 2019-08-16 | 2019-11-12 | 河南省三禾电气有限公司 | A kind of pole-mounted circuit breaker |
| CN110444440B (en) * | 2019-08-16 | 2021-06-08 | 河南省三禾电气集团有限公司 | Pole-mounted circuit breaker |
| CN111025140A (en) * | 2019-12-27 | 2020-04-17 | 国网山西省电力公司电力科学研究院 | Method for improving opening speed of breaker model based on spring assistance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081126 |