CN100454458C - Gradual damping oil buffer - Google Patents
Gradual damping oil buffer Download PDFInfo
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- CN100454458C CN100454458C CNB2006100496322A CN200610049632A CN100454458C CN 100454458 C CN100454458 C CN 100454458C CN B2006100496322 A CNB2006100496322 A CN B2006100496322A CN 200610049632 A CN200610049632 A CN 200610049632A CN 100454458 C CN100454458 C CN 100454458C
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- oil cylinder
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- spill port
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- 238000013016 damping Methods 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 230000003139 buffering effect Effects 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
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Abstract
The invention discloses a gradual damping oil buffer for a vacuum circuit breaker, which comprises an oil cylinder, an end cover, a sealing ring, a piston assembly and a pressure spring, wherein the piston assembly and the pressure spring are arranged in the oil cylinder, a working area and a guide hole are arranged in the oil cylinder, a certain amount of buffer oil is filled in the oil cylinder, and the oil cylinder is sealed by the end cover and the sealing ring, and the gradual damping oil buffer is characterized in that: the clearance between the piston and the working area of the oil cylinder is a variable value, the clearance between the piston and the oil cylinder is larger in the early stage of the movement of the piston, and the clearance between the piston and the oil cylinder is smaller in the later stage of the movement of the piston. The oil buffer disclosed by the invention has the advantages that the braking force distribution is matched with the brake-separating process of the switch equipment, and the oil buffer is more scientific and reasonable.
Description
Technical field
The invention belongs to the electric switch field, more specifically, relate to the buffer in the vacuum circuit-breaker, particularly a kind of gradual damping oil buffer.
Background technology
In the medium voltage breaker of usefulness, vacuum circuit-breaker occupies bigger ratio at present.The stroke of vacuum circuit-breaker is less, but its opening velocity is very high.For the very high moving component of speed is stopped in short stroke, generally absorb the kinetic energy of motion parts with buffer, and in the significant bounce-back that do not have of stroke end of a period place motion parts.The importance of buffer in vacuum circuit-breaker is often ignored by the people, and in fact its effect is very important.Present domestic vacuum circuit-breaker widespread usage oil bumper, structure is similar, all is piston is set in oil cylinder, is equipped with a certain amount of buffering oil in the oil cylinder, utilizes oil that the cushioning effect of piston is absorbed kinetic energy.
In such oil bumper, its braking force F can be represented by the formula:
F＝Kv
K=3 π η LD wherein
3/ 4 δ
3
In the formula, F is the braking force of oil bumper, and K is a damping coefficient, and L is depth pistion (m), and D is piston diameter (m), and δ is the gap (m) between piston and the oil cylinder, and v is the movement velocity (m/s) of piston, and η is the absolute viscosity (Pas) of oil.
Such oil bumper has following characteristics: 1. when oil bumper had just been devoted oneself to work, braking force was bigger; 2. the low speed shock-absorbing capacity is poor, and along with the reduction of piston movement speed, braking force also reduces thereupon.And the break performance of vacuum circuit-breaker and its opening velocity have very big relation, and its rate request can characterize with " fast, slow, slow ".In the starting stage of separating brake,, should not cushion because its speed (being just-off speed) requires to want height; Contact oily damper piston moment at the main shaft connecting lever, opening velocity can not suddenly change; And at separating brake on earth the time, buffer must not have the bounce-back of big spoke value.Obviously, oil bumper of the prior art can not reach this requirement fully.
Summary of the invention
The technical problem to be solved in the present invention is that the oil bumper braking force distribution in the circuit breaker is unreasonable, and a kind of gradual damping oil buffer that is complementary with switchgear separating brake process is provided.
The technical solution used in the present invention is such: gradual damping oil buffer, comprise oil cylinder, end cap, sealing ring, piston component and stage clip, piston component and stage clip place in the oil cylinder, there are service area and pilot hole in oil cylinder inside, and it is oily to be filled with a certain amount of buffering, sealed with end cap, sealing ring, it is characterized in that: the gap between piston and the oil cylinder service area is a changing value, in the early stage of piston motion, gap between piston and the oil cylinder is bigger, in the later stage of piston motion, the gap between piston and the oil cylinder is less.
Further, piston is a multisection type cylinder, and its hypomere is a guide cylinder, cooperates with in-oil cylinder pilot hole; The stage casing is a piston main body, cooperates with the service area of oil cylinder; The hypomere internal diameter of oil cylinder service area is less than the epimere internal diameter.
The present invention can have two kinds of optimized technical scheme, and first oil cylinder service area inwall is made up of the plurality of sections face of cylinder, and each section seamlessly transits with fillet between the face of cylinder, and its internal diameter progressively diminishes from top to bottom; Another preferred scheme is that oil cylinder service area inwall is a conical surface-shaped, and its internal diameter progressively diminishes from top to bottom.
Piston main body is provided with spill port, makes piston oil cylinder cavity up and down communicate, and annular spread has several oil-through holes around the oil cylinder pilot hole, and cavity becomes oil circuit by the gap of oil-through hole, piston spill port, piston and oil cylinder about the oil cylinder; Piston jacket has annular to end circle, is in the below of piston spill port, can endwisely slip along outer surface of piston, when its during with the spill port applying, spill port is blocked; The external annular of piston is ended the circle below and also is fixed with a block card, and block card two ends distance is ended the interior circular diameter of circle greater than annular, thereby when annular is ended circle and moved downward it is blocked.
Further, piston is provided with draw-in groove, and block card is fixed in the draw-in groove; The inwall in piston stage casing is provided with drain pan and water conservancy diversion cambered surface, and buffering oil is got back to the oil cylinder lower cavity along water conservancy diversion cambered surface and drain pan after flowing out from spill port.
The design in multistage of the present invention gap is based on such consideration: for vacuum circuit-breaker, in the starting stage of separating brake, discharge " overtravel " spring energy, improve just-off speed, should not cushion in this stage.If will cushion, also never allow to occur the situation of speed rapid drawdown, the gap of buffer can be arranged to enough big in this section stroke, makes it to have the effect of not having buffering or minibuffer.Ensuing gap can be considered like this: according to the arcing situation of vacuum interrupter, after first opening the phase arc extinguishing, promptly reduce the damping gap, increase damping coefficient, but should still can not make the opening velocity sudden change stage.Otherwise arc extinguishing moment contact sharp pounding might cause splashing of metal particle and destroy the smooth of contact surface, and this is very disadvantageous to cut-offfing, and also is to produce the latent dangerous factor that bang is worn.The end of a period stage near stroke further reduces the damping gap, continue to increase damping coefficient, or makes braking force cumulative, can guarantee so not rebound or make the bounce-back value as far as possible little at stroke end of a period place contact, and open phase quenching time interval after avoiding.
The present invention is when work, because upper gap is bigger, damping coefficient is less; Along with the increase of piston stroke, gap smaller, damping coefficient increases; Near the stroke ultimate position, the gap minimum, the damping coefficient maximum, although this moment, piston speed reduced, buffer braking force still can remain unchanged substantially, thereby makes opening velocity embody the feature of " fast, slow, slow ".
When piston of the present invention moved downward, annular was ended the thrust that circle is subjected to cushioning oil, moves upward, and the spill port on the piston is blocked, and made buffering oil be difficult to get back to the top of oil cylinder cavity, can give full play to damping action; When piston moved upward, the space appearred in anterior cavity, and annular is ended circle and is subjected to inertia and differential pressure action, move downward with respect to piston, make spill port unimpeded, buffering oil can pass through spill port, drain pan, get back to the oil cylinder lower cavity rapidly, piston also can reset rapidly, for separating brake is next time got ready.The effect of water conservancy diversion cambered surface and drain pan is after order buffering oil flows out from spill port, to get back to the oil cylinder lower cavity according to the flow direction of setting, and it is more smooth and easy to reflux like this, and speed is faster.
Description of drawings
Fig. 1 is the structural representation of oil bumper in the prior art.
Fig. 2 is the structural representation of the embodiment of the invention one.
Fig. 3 is the structural representation of the embodiment of the invention two.
Fig. 4 is the schematic diagram of piston among the present invention.
Fig. 5 is the oil cylinder schematic diagram in the embodiment of the invention one.
Fig. 6 is the oil cylinder schematic diagram in the embodiment of the invention two.
Fig. 7 is the oil circuit schematic diagram of piston of the present invention when moving downward.
Fig. 8 is the oil circuit schematic diagram of piston of the present invention when moving upward.
Embodiment
Prior art
Referring to Fig. 1.The oil bumper of prior art comprises oil cylinder 03, and piston 04, piston and oil cylinder are matched in clearance, are connected with stage clip 08 under the piston, is filled with buffering oil 09 in the oil cylinder, when piston moves downward, comes buffer piston by cushioning oil 09.
Embodiment one
Referring to Fig. 2, Fig. 4, Fig. 5.In the present embodiment, oil bumper comprises end cap 11, sealing ring 12, oil cylinder 13, piston 14, annular only enclose 15, block card 16 is formed piston components, and hold-down nut 17 is fixed in oil bumper on the vacuum circuit-breaker, be connected with stage clip 18 under the piston, be filled with buffering oil 19 in the oil cylinder; End cap 11 and sealing ring 12 will cushion oil seal in the cavity of oil cylinder 13.
Service area 130 and pilot hole 134 are arranged in the oil cylinder 13, and wherein the inwall of service area 130 is made up of the plurality of sections face of cylinder 131,132,133, seamlessly transits with fillet between each section, and from top to bottom, the internal diameter on each section face of cylinder progressively diminishes; The peripheral annular of pilot hole 134 is distributed with several oil-through holes 135.
Piston 14 is a multistage cylinder, and hypomere is a guide cylinder 45, and the stage casing is piston main body 40 (piston among Fig. 4 is the piston 14 among Fig. 2), and the gap delta between itself and oil cylinder progressively diminishes from top to bottom; Have the penetrating spill port 42 of some annular arrangements on the piston main body 4, also be provided with water conservancy diversion cambered surface 43 and drain pan 44 on the inwall of piston main body 4, all below spill port 42; Be with annular on the piston simultaneously and only enclose 15 and block card 16, annular is ended circle and piston for being slidingly connected, and can be in axial sliding along piston, and block card is inserted in the draw-in groove 41, fixes with piston.
In the separating brake process of vacuum switch, connecting lever contacts with cap, and present embodiment is promptly had an effect.This moment, piston 14 moved downward, and annular is only enclosed 15 and is subjected to cushioning oily 19 thrust, moves upward, and the spill port on the piston 42 is blocked, and made buffering oil be difficult to get back to the top of oil cylinder cavity.When piston stroke began, because the gap delta of 13 of piston 14 and oil cylinders is bigger, damping coefficient was less; Subsequently, piston 14 continues to move downward, and gap delta diminishes, and it is big that damping coefficient becomes; Along with the increasing of switch over travel, piston component moves downward near the ultimate position, and gap delta further diminishes, and damping coefficient continues to increase, and arrives the separating brake position until contact.Although this moment, switching speed was lower, the braking force of buffer is still bigger, and the switch opening velocity reduces to zero gradually, and contact bounce-back amplitude is just little.
Embodiment two
Referring to Fig. 3, Fig. 4, Fig. 6.In the present embodiment, oil bumper comprises end cap 21, sealing ring 22, oil cylinder 23, piston 24, annular only enclose 25, block card 26 is formed piston components, and hold-down nut 27 is fixed in oil bumper on the vacuum circuit-breaker, be connected with stage clip 28 under the piston, be filled with buffering oil 29 in the oil cylinder; End cap 21 and sealing ring 22 will cushion oil seal in the cavity of oil cylinder 23.
Service area 230 and pilot hole 234 are arranged in the oil cylinder 23, and the inwall of service area 230 can be divided into three section 231,232,233 equally, and wherein 232 and 233 two sections are truncated cone shape, and the oil cylinder internal diameter progressively diminishes from top to bottom; The peripheral annular of pilot hole 234 is distributed with several oil-through holes 235.
Piston 24 is a multistage cylinder, and hypomere is a guide cylinder 45, and the stage casing is piston main body 40 (piston among Fig. 4 is the piston 24 among Fig. 3), and the gap delta between itself and oil cylinder progressively diminishes from top to bottom; Have the penetrating spill port 42 of some annular arrangements on the piston main body 4, also be provided with water conservancy diversion cambered surface 43 and drain pan 44 on the inwall of piston main body 4, all below spill port 42; Be with annular on the piston simultaneously and only enclose 25 and block card 26, annular is ended circle and piston for being slidingly connected, and can be in axial sliding along piston, and block card is inserted in the draw-in groove 41, fixes with piston.
Other structures and the course of work all with embodiment one, repeat no more.
Listed herein only is two embodiment of the present invention, and protection scope of the present invention is not limited to this two embodiment.
Description about oil circuit
Referring to Fig. 7, Fig. 8.The oil circuit of buffering oil when working for the present invention among the figure, embodiment one, two and other execution modes, oil circuit is all identical, so take a single example.
When piston moved downward, as shown in Figure 7, the buffering oil of oil cylinder cavity front portion flowed backward from oil-through hole, because the spill port on the piston was ended circle by annular and blocked this moment, buffering oil can only flow to the cavity rear portion through the gap of piston and oil cylinder service area inwall; Obviously, along with piston moves downward, this gap delta is more and more littler.
When piston moved upward, as shown in Figure 8, annular was ended circle and is fallen to the block card place, and the spill port on the piston is unimpeded, cushioned oil this moment and can pass through spill port, drain pan, oil-through hole and be back to the cavity front portion.Because the sectional area of spill port is much larger than the gap delta of piston and oil cylinder, and the multiple action of gravity and cavity front portion negative pressure is arranged when refluxing, so back-flow velocity is quickish, can satisfies the requirement of vacuum circuit-breaker separating brake fully.
Claims (4)
1. gradual damping oil buffer, comprise oil cylinder, end cap, sealing ring, piston component and stage clip, piston component and stage clip place in the oil cylinder, and there are service area and pilot hole in oil cylinder inside, and are filled with a certain amount of buffering oil, sealed with end cap, sealing ring, gap between piston and the oil cylinder service area is a changing value, and in the early stage of piston motion, the gap between piston and the oil cylinder is bigger, in the later stage of piston motion, the gap between piston and the oil cylinder is less; It is characterized in that: piston is a multisection type cylinder, and its hypomere is a guide cylinder, cooperates with in-oil cylinder pilot hole; The stage casing is a piston main body, cooperates with the service area of oil cylinder; The hypomere internal diameter of oil cylinder service area is less than the epimere internal diameter; Piston main body is provided with spill port, makes piston oil cylinder cavity up and down communicate, and annular spread has several oil-through holes around the oil cylinder pilot hole, and cavity becomes oil circuit by the gap of oil-through hole, piston spill port, piston and oil cylinder about the oil cylinder; Piston jacket has annular to end circle, is in the below of piston spill port, can endwisely slip along outer surface of piston, when its during with the spill port applying, spill port is blocked; The external annular of piston is ended the circle below and also is fixed with a block card, and block card two ends distance is ended the interior circular diameter of circle greater than annular, thereby when annular is ended circle and moved downward it is blocked.
2. oil bumper as claimed in claim 1 is characterized in that: oil cylinder service area inwall is made up of the plurality of sections face of cylinder, and each section seamlessly transits with fillet between the face of cylinder, and its internal diameter progressively diminishes from top to bottom.
3. oil bumper as claimed in claim 1 is characterized in that: oil cylinder service area inwall is a conical surface-shaped, and its internal diameter progressively diminishes from top to bottom.
4. as claim 2 or 3 described oil bumpers, it is characterized in that: piston is provided with draw-in groove, and block card is fixed in the draw-in groove; The inwall in piston stage casing is provided with drain pan and water conservancy diversion cambered surface, and buffering oil is got back to the oil cylinder lower cavity along water conservancy diversion cambered surface and drain pan after flowing out from spill port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100496322A CN100454458C (en) | 2006-02-28 | 2006-02-28 | Gradual damping oil buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100496322A CN100454458C (en) | 2006-02-28 | 2006-02-28 | Gradual damping oil buffer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101022058A CN101022058A (en) | 2007-08-22 |
| CN100454458C true CN100454458C (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100496322A Expired - Fee Related CN100454458C (en) | 2006-02-28 | 2006-02-28 | Gradual damping oil buffer |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104016239A (en) * | 2014-05-29 | 2014-09-03 | 鞍钢集团矿业公司 | Barrier buffering apparatus for bridge crane |
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| CN101944445B (en) * | 2009-09-30 | 2014-06-04 | 江苏现代电力电容器有限公司 | Switching appliance for AC circuit |
| CN103292026B (en) * | 2013-01-29 | 2015-12-23 | 河海大学常州校区 | Valve buffer |
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| CN2376073Y (en) * | 1999-04-29 | 2000-04-26 | 王大太 | Oleo damper for primary cut-out |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101022058A (en) | 2007-08-22 |
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