CN1375640A - Pressure-reducing and flow rate-increasing swtich liquid pressure source with oil returning back pressure - Google Patents
Pressure-reducing and flow rate-increasing swtich liquid pressure source with oil returning back pressure Download PDFInfo
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- CN1375640A CN1375640A CN 02111423 CN02111423A CN1375640A CN 1375640 A CN1375640 A CN 1375640A CN 02111423 CN02111423 CN 02111423 CN 02111423 A CN02111423 A CN 02111423A CN 1375640 A CN1375640 A CN 1375640A
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- hydraulic
- valve
- pressure
- liquid inductance
- liquid
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- 239000007788 liquid Substances 0.000 title claims abstract description 42
- 230000009467 reduction Effects 0.000 claims description 11
- 230000006837 decompression Effects 0.000 claims description 10
- 239000000446 fuel Substances 0.000 claims description 8
- XSHGVIPHMOTDCS-UHFFFAOYSA-N 1-(5-fluoropentyl)-n-(2-phenylpropan-2-yl)indazole-3-carboxamide Chemical compound N=1N(CCCCCF)C2=CC=CC=C2C=1C(=O)NC(C)(C)C1=CC=CC=C1 XSHGVIPHMOTDCS-UHFFFAOYSA-N 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- -1 metallurgy Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Fluid-Pressure Circuits (AREA)
Abstract
The present invention discloses a pressure-decreasing flow-increasing type switch hydraulic source with oil-returning backpressure, which is characterized by that the high-speed switch valve and liquid inductance element are series-connected on the hydraulic main line oil supply pipeline, the backpressure valve is connected on the hydraulic main line oil-returning pipeline, the non-return valve and liquid volume element are respectively cross-connected between the hydraulic main line oil supply pipeline and oil-returning pipeline, the output end of the non-return valve is connected with output end of high-speed switch valve and input end of liquid inductance element, and the input end of liquid volume element is connected with output end of liquid inductance element, and the output end of non-return valve and output end of liquid volume element are connected with input end of backpressure valve.
Description
Technical field
The present invention relates to pressurized machine or fluid pressure transducer.
Background technique
One of advantage of hydraulic system maximum is its multi executors characteristic, promptly can drive the action of multichannel final controlling element simultaneously by single oil hydraulic pump fuel feeding.
The production line hydraulic system of enterprises such as present most of industrial and mineral, metallurgy, iron and steel all adopts the fuel system of hydraulic bus: export one road pressure oil pipe, one tunnel control oil, one tunnel oil return and one tunnel leakage oil by pumping plant, all hydraulic actuator control units all hang on this hydraulic bus.Because the charge oil pressure on the hydraulic bus is constant, thereby require the load of each final controlling element and charge oil pressure to adapt, perhaps need again final controlling element to be suspended on the hydraulic bus with this final controlling element load by a reduction valve (be reduced to adapt the charge oil pressure on the hydraulic bus).Owing to can't realize boosting and decompression and flow increasing, the physical dimension of ubiquity pumping plant delivery pressure height, each final controlling element is subjected to problems such as restriction loss is big on the restriction of final controlling element charge oil pressure, the reduction valve.
The hydraulic system of large-scale engineering machinery also adopts single oil pump feed to drive the mode of a plurality of final controlling element coordinations mostly.Though can realize that the delivery pressure of pump and highest load pressure adapt by modes such as load-sensitives, but same existence can't realize boosting and the problem of decompression and flow increasing, thereby for non-highest load pressure connection performer, restriction loss on control valve is still very big, and energy dissipation is serious.
Though common adjusting and voltage-reduction switch hydraulic power can be realized decompression and flow increasing, but because the pressure surge that return oil pressure is greatly low when causing one-way valve from the oil circuit oil suction easily or cause that high-frequency pressure switches the cavitation erosion of cavity volume has a strong impact on the efficient and the reliability of switch hydraulic source.
Summary of the invention
The objective of the invention is to design a kind of decompression and flow increasing type switch hydraulic source of taking back oily back pressure, directly hang over the input end in switch source on the hydraulic bus, by speed-sensitive switch mode decompression and flow increasing in addition, pressure and flow that final output and each final controlling element demand adapt.
The technical solution used in the present invention is as follows: it comprises high-speed switch valve, liquid inductance element, one-way valve, element for the hydraulic volume, back pressure valve; High-speed switch valve and liquid inductance element are serially connected on the hydraulic bus fuel feeding road, back pressure valve is connected on the hydraulic bus oil circuit, one-way valve, element for the hydraulic volume are connected across respectively between hydraulic bus fuel feeding road and hydraulic bus oil circuit, the output terminal of one-way valve is connected with the input end of the output terminal of high-speed switch valve, liquid inductance element, the input end of element for the hydraulic volume is connected with the input end of liquid inductance element, the input end of element for the hydraulic volume is connected with the output terminal of liquid inductance element, and the input end of the output terminal of one-way valve, the output terminal of element for the hydraulic volume and back pressure valve is connected.
The present invention is T for high-speed switch valve provides the cycle, and dutycycle (current"on"time with cycle ratio) is the pulse width modulated wave of D.When high-speed switch valve cuts off the power supply (oil circuit is logical), the charge oil pressure of the logical hydraulic bus of the input end of liquid inductance element, liquid inductance quickens under the effect of hydraulic bus charge oil pressure, stored energy; When high-speed switch valve was switched on (oil circuit is disconnected), the input end of liquid inductance element was by one-way valve oil suction from the return line of band back pressure.Because delivery pressure is higher than the charge oil pressure of hydraulic bus, liquid inductance slows down under the effect of backpressure difference, discharges stored energy; Thereby realize the step-down of switch hydraulic source.Element for the hydraulic volume is used for carrying out filtering, reduces the delivery pressure ripple that causes because of speed-sensitive switch.
The beneficial effect that the present invention has is: can export required force value by to the control of pulse width modulated wave dutycycle, and for final controlling element provide with its consumed power (be not flow! ) flow that adapts, the pressure surge when having reduced simultaneously one-way valve significantly from the oil circuit oil suction, thereby the dynamic loss in the low pressure oil-absorbing process declines to a great extent, and reached best energy-saving effect on the whole.
Description of drawings
Accompanying drawing is a structural principle schematic representation of the present invention.
Embodiment
As shown in drawings, it comprises high-speed switch valve 1, liquid inductance element 2, one-way valve 3, element for the hydraulic volume 4, back pressure valve 5; High-speed switch valve 1 and liquid inductance element 2 are serially connected on the hydraulic bus fuel feeding road A, back pressure valve 5 is connected on the hydraulic bus oil circuit B, one-way valve 3, element for the hydraulic volume 4 are connected across respectively between hydraulic bus fuel feeding road A and hydraulic bus oil circuit B, the output terminal of the output terminal of one-way valve 3 and high-speed switch valve 1, the input end of liquid inductance element 2 are connected, the input end of element for the hydraulic volume 4 is connected with the input end of liquid inductance element 2, the input end of element for the hydraulic volume 4 is connected with the output terminal of liquid inductance element 2, and the output terminal of the output terminal of one-way valve 3, element for the hydraulic volume 4 and the input end of back pressure valve are connected.
P among the figure
1The charge oil pressure of expression hydraulic bus, T represents the return pressure of hydraulic bus;
p
2The delivery pressure of expression switch hydraulic source, because it is again simultaneously the pressure that liquid holds two ends, thereby this pressure can not suddenly change p
TThe return oil pressure that expression is returned from load;
Q
1The flow of liquid inductance element is flow through in expression, and this flow can not suddenly change;
P
3The pressure of expression liquid inductance input end, this pressure is along with the high speed switching of high-speed switch valve is constantly switched between hydraulic bus charge oil pressure and return oil pressure.
Q
3The flow of high-speed switch valve is flow through in expression, and this flow is also along with the high speed of high-speed switch valve is switched constantly at Q
1And switch between zero.
Q
2And Q
4Represent the output flow of switch hydraulic source respectively and flow through the flow that liquid holds, flow these two flows and that equal to flow through liquid inductance.
If the quality of the internal leakage of element for the hydraulic volume 4 and liquid inductance element 2, friction and element for the hydraulic volume can be ignored, and suppose that high-speed switch valve 1 and one-way valve 3 are ideal element (restriction loss of opening-closing process is zero), be T the pulsewidth modulation period of wave of high-speed switch valve 1, dutycycle (current"on"time with cycle ratio) is D, then the delivery pressure p of switch hydraulic source
2Be directly proportional with the incoming pressure of hydraulic bus, be directly proportional, the average input flow rate Q of hydraulic bus with the dutycycle of power-off time
3Be directly proportional with the output flow of system, be directly proportional with the dutycycle of power-off time.That is:
p
2＝(1-D)·p
1+D·p
T
Q
3=(1-D) Q
2Thereby realize the decompression and flow increasing of switch hydraulic source.Owing on oil circuit, increased a back pressure valve 5, produce certain throttling loss, the pressure conversion efficiency under its perfect condition will be lower than 100%.But because the reduction significantly of the one-way valve 3 in this switch source pressure surge during from the oil circuit oil suction, thereby the dynamic loss in the low pressure oil-absorbing process declines to a great extent, and reached best energy-saving effect on the whole.
Said liquid inductance element 2 just can be used as the sensing element in the switch hydraulic source as long as be similar to the described relation of following formula by the flow of this element and the pressure reduction at its two ends in the accompanying drawing, represents with following formula:
In the formula: the pressure reduction at Δ p-liquid inductance element two ends;
L-liquid inductance value, dimension is [MPa/ (L/min)] s;
S-second;
Has the liquid inductance element that is similar to the described relation of following formula for by the oil hydraulic motor of a high-speed hydraulic motor with a big inertia load of forming with the flywheel that hydraulic motor output shaft directly links to each other of driving.
Said element for the hydraulic volume 4 in the accompanying drawing just can be used as the element for the hydraulic volume in the switch hydraulic source as long as the pressure reduction at its two ends is similar to the described relation of following formula with flow by this element, represents with following formula:
Wherein: Q
4-flow by element for the hydraulic volume;
C-liquid appearance value, dimension is [(L/min)/MPa] s;
S-second;
Claims (3)
1. decompression and flow increasing type switch hydraulic source of taking back oily back pressure, it is characterized in that: it comprises high-speed switch valve [1], liquid inductance element [2], one-way valve [3], element for the hydraulic volume [4], back pressure valve [5]; High-speed switch valve [1] and liquid inductance element [2] are serially connected on the hydraulic bus fuel feeding road [A], back pressure valve [5] is connected on the hydraulic bus oil circuit [B], one-way valve [3], element for the hydraulic volume [4] is connected across respectively between hydraulic bus fuel feeding road [A] and hydraulic bus oil circuit [B], the output terminal of the output terminal of one-way valve [3] and high-speed switch valve [1], the input end of liquid inductance element [2] connects, the input end of element for the hydraulic volume [4] is connected with the input end of liquid inductance element [2], the input end of element for the hydraulic volume [4] is connected with the output terminal of liquid inductance element [2], the output terminal of one-way valve [3], the output terminal of element for the hydraulic volume [4] and the input end of back pressure valve are connected.
2. the decompression and flow increasing type switch hydraulic source of taking back oily back pressure according to claim 1, it is characterized in that: said liquid inductance element [2] is as long as be similar to the described relation of following formula by the flow of this element and the pressure reduction at its two ends, just can be used as the sensing element in the switch hydraulic source, represent with following formula:
In the formula: the pressure reduction at Δ p-liquid inductance element two ends;
L-liquid inductance value, dimension is [MPa/ (L/min)] s;
S-second;
Has the liquid inductance element that is similar to the described relation of following formula for by the oil hydraulic motor of a high-speed hydraulic motor with a big inertia load of forming with the flywheel that hydraulic motor output shaft directly links to each other of driving.
3. the decompression and flow increasing type switch hydraulic source of taking back oily back pressure according to claim 1: it is characterized in that: said element for the hydraulic volume [4] is as long as the pressure reduction at its two ends is similar to the described relation of following formula with flow by this element, just can be used as the element for the hydraulic volume in the switch hydraulic source, represent with following formula:
Wherein: Q
4-flow by element for the hydraulic volume;
C-liquid appearance value, dimension is [(L/min)/MPa] s;
S-second;
The variance ratio of-element for the hydraulic volume two ends pressure reduction; Having the element for the hydraulic volume that is similar to the described relation of following formula is accumulator, spring hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111423 CN1133018C (en) | 2002-04-17 | 2002-04-17 | Pressure-reducing and flow rate-increasing swtich liquid pressure source with oil returning back pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02111423 CN1133018C (en) | 2002-04-17 | 2002-04-17 | Pressure-reducing and flow rate-increasing swtich liquid pressure source with oil returning back pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1375640A true CN1375640A (en) | 2002-10-23 |
| CN1133018C CN1133018C (en) | 2003-12-31 |
Family
ID=4741556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02111423 Expired - Fee Related CN1133018C (en) | 2002-04-17 | 2002-04-17 | Pressure-reducing and flow rate-increasing swtich liquid pressure source with oil returning back pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1133018C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865551B (en) * | 2009-04-14 | 2012-08-08 | 开利公司 | Suction valve pulse width modulation control based on pressure of evaporator or condenser |
| CN106246614A (en) * | 2016-08-26 | 2016-12-21 | 武汉理工大学 | A kind of pressure-transforming energy-saving driver of automatic adaptation load |
-
2002
- 2002-04-17 CN CN 02111423 patent/CN1133018C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865551B (en) * | 2009-04-14 | 2012-08-08 | 开利公司 | Suction valve pulse width modulation control based on pressure of evaporator or condenser |
| CN106246614A (en) * | 2016-08-26 | 2016-12-21 | 武汉理工大学 | A kind of pressure-transforming energy-saving driver of automatic adaptation load |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1133018C (en) | 2003-12-31 |
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