CN100439895C - Oil elastic modulus detector based on volume elastic modulus definition - Google Patents

Oil elastic modulus detector based on volume elastic modulus definition Download PDF

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Publication number
CN100439895C
CN100439895C CNB2006100491776A CN200610049177A CN100439895C CN 100439895 C CN100439895 C CN 100439895C CN B2006100491776 A CNB2006100491776 A CN B2006100491776A CN 200610049177 A CN200610049177 A CN 200610049177A CN 100439895 C CN100439895 C CN 100439895C
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oil
valve
directional control
communicated
elastic modulus
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CNB2006100491776A
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CN1804576A (en
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龚国芳
王静
杨华勇
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The present invention discloses an oil elastic modulus detecting device based on volume elastic modulus definition. A piston rod in a loading cylinder stretches into a testing cavity and can make axial motion; an oil inlet of a one-way valve is communicated with a cavity with a rod of the loading cavity, and the oil outlet is communicated with the testing cavity; a pressure sensor is communicated with the testing cavity; a built-in displacement sensor is arranged in the piston rod of a piston; the cavity without rods, the cavity with a rod, and the testing cavity of the loading cylinder are respectively communicated with a hydraulic system. The loading cylinder exerts pressure on oil liquid with a certain volume in the testing cavity to change the pressure and obtain the variation amount of the volume of the corresponding liquid. In the process of pressure exertion, the friction force of the piston and the piston rod is irrelevant to the measuring result, so that the problem that the loading force is difficult to accurately calculated is solved. The measuring result can be ensured to represent the actual condition of the oil liquid in the system through the circulation of the measured oil liquid. The present invention can automatically detect the elastic modulus of oil liquid in real time, and detection signals can be used for removing the air content in oil liquid and increasing the elastic modulus of oil liquid in the hydraulic system.

Description

Fluid elastic modulus pick-up unit based on the bulk modulus definition
Technical field
The present invention relates to the detection of fluid media (medium) physical characteristics, relate in particular to a kind of fluid elastic modulus pick-up unit.
Background technology
Bulk modulus is an important physical parameter of fluid, and it directly influences the natural frequency and the damping ratio of Hydraulic Elements and hydraulic system, thereby influences stability and dynamic quality.In the dynamic design and calculation of Hydraulic Elements, Hydraulic Power Transmission System, electrohydraulic servo system, especially in the dynamic simulation of hydraulic system calculated, the bulk modulus value of rationally choosing fluid exactly was extremely important.The active volume elastic modulus of fluid can be divided into the bulk modulus of fluid and the elastic modulus two large divisions of pipeline and annex, and occupies an leading position with the former, and therefore, constrictive research is important problem in the hydraulic technique field to fluid.The bulk modulus of fluid changes with pressure, temperature, air content and the molecular structure of fluid.In actual applications, often according to the elastic modulus of pure oil, pipe deforming, mix gas situation etc., estimate the bulk modulus of fluid roughly.Experiment shows that estimated value and measured value often have bigger discrepancy.But in present fluid elastic modulus was measured, reliable, practical measuring equipment also only was confined to learned discussion, lacked this kind equipment and had become a big difficult point of carrying out when being correlated with real work.Practical fluid elastic modulus pick-up unit is very useful in the work of reality, and the fluid elastic mould value input analytical model by recording can make the simulation analysis of system obtain better computational accuracy; On the other hand, it can help research staff and user's assessment of hydraulic system and judge the influence of air content to system performance.
Utilize the corresponding relation between the bulk modulus of the air content of fluid and fluid, the air content that fluid elastic modulus pick-up unit also can indirect detection fluid, its detection signal can directly be controlled the fluid off gas system.During hydraulic work system, the air content in the fluid can produce very big influence to system performance, yet gas may be to exist with bubble or the mode that is dissolved in fluid in fluid, is difficult to discover.Have only the veteran hydraulic engineer could be when system performance descends, the air content from fluid be searched reason.When containing gas in the fluid, the various negative effects of system performance are mainly contained: reduce the bulk modulus and the rigidity of fluid, make system responses characteristic variation; Because the fluid compressibility increases, consumed energy in the process of compression fluid, and oil liquid temperature is raise; Produce cavitation erosion, aggravate degrading and damage of element material surface, and cause system vibration and noise; Airborne oxygen impels the fluid oxidation deterioration, and the oil lubrication performance descends, and acid number and sediment increase; Oil film in the fluid between the bubble destruction kinematic pair, the wearing and tearing of aggravation element.Practical fluid elastic modulus pick-up unit can provide foundation for air content, the raising hydraulic system oil liquid elastic modulus that control is removed in the fluid, realizes the accurate control of hydraulic system oil liquid air content.
The detection of fluid elastic modulus, dual mode is directly measured and measured indirectly to normal the employing.Directly measurement is exactly the defined formula according to the fluid elastic modulus:
K = V 0 Δp ΔV
Measure, K is the elastic modulus of fluid in the formula, V 0Be the fluid volume of original state, Δ V is the change amount of fluid volume, and Δ P is the change amount of the oil liquid pressure corresponding with Δ V.The domestic and international existing achievement in research of analysis-by-synthesis as can be known, when measuring by the definition of fluid elastic modulus, mainly have following problem: pressure process needs manual operation, be difficult to realize robotization and on-line measurement; Because very high to the requirement of the sealing property between relative slide unit, the influence of the influence of friction force and container deformation in the pressure process makes that measuring accuracy is not easy to be guaranteed; The automatic replacing of tested fluid is not easy to realize, is difficult to the actual conditions that the assurance measurement result can be represented fluid in the hydraulic system.
External at present indirect measurement method commonly used, this method is utilized the relation between fluid elastic modulus and pressure-wave propagation speed and the fluid density, by the velocity of wave of gaging pressure ripple, calculates the elastic mould value of fluid.When using the method for measuring indirectly, be difficult to the pressure wave velocity of wave is done accurately to measure, calculate the elastic mould value of fluid again by transformational relation between the two, measurement result certainly exists deviation.This method system complex, cost height, precision are low.
Summary of the invention
In order to overcome the problem that exists in the fluid elastic modulus testing process described in the background technology, the invention provides a kind of fluid elastic modulus pick-up unit based on the bulk modulus definition, can make hydraulic system can detect the fluid elastic modulus in real time, and have higher sensitivity and precision.
The technical solution adopted for the present invention to solve the technical problems comprises:
The present invention includes: load cylinder, piston and piston rod, test chamber, retaining valve, pressure transducer, built-in displacement transducer; The piston rod that loads in the cylinder extend in the test chamber, and can move axially the oil inlet P of retaining valve in test chamber 1Be communicated with the oil-out T of retaining valve with the rod chamber that loads cylinder 1Be communicated with test chamber, pressure transducer is communicated with test chamber, and built-in displacement transducer places piston and the piston rod that loads cylinder, and the rodless cavity of loading cylinder and rod chamber and test chamber are communicated with hydraulic system respectively by pipeline.
Described hydraulic system comprises: two-position four-way solenoid directional control valve, pilot operated compound relief valve, bi-bit bi-pass solenoid directional control valve, direct-acting overflow valve, bi-bit bi-pass Solenoid ball valve; The first oil-out B of the two-position four-way solenoid directional control valve in the hydraulic system 1Be communicated with the second oil-out A of two-position four-way solenoid directional control valve with the rodless cavity that loads cylinder 1 1Be communicated with the rod chamber that loads cylinder; The oil return inlet T of two-position four-way solenoid directional control valve 2Meet the oil-out T of direct-acting overflow valve 5, pilot operated compound relief valve oil-out T 3Oil-out T with the bi-bit bi-pass Solenoid ball valve 6, the oil inlet P of two-position four-way solenoid directional control valve 2Connect the oil inlet P of pilot operated compound relief valve 3, the oil-out T of pilot operated compound relief valve 3Meet the oil-out T of bi-bit bi-pass Solenoid ball valve 6Oil-out T with direct-acting overflow valve 5, the control mouth X of pilot operated compound relief valve connects the oil inlet P of bi-bit bi-pass solenoid directional control valve 4, the oil-out T of bi-bit bi-pass solenoid directional control valve 4Connect the oil inlet P of direct-acting overflow valve 5, the oil inlet P of bi-bit bi-pass Solenoid ball valve 6Connect the oil-out of test chamber.
The a part of fluid that utilizes hydraulic system is as research object, the piston rod that loads cylinder is extend into test chamber, and can move in test chamber, test chamber is a weldless steel tube, therefore wall thickness 30mm can ignore the influence that tube wall deformation is measured the fluid elastic modulus fully.The size of test chamber pressures is directly measured by pressure transducer, so the friction force and the measurement result of piston and piston rod is irrelevant in the pressure process.Before the pressurization, the fluid in the hydraulic system can flow in test chamber, so the tested fluid of test chamber is through the fluid in the round-robin system.The oil inlet P of retaining valve 1Be communicated with the oil-out T of retaining valve with the rod chamber that loads cylinder 1Be communicated with test chamber.Pressure transducer is communicated with test chamber.Displacement transducer is built on the piston and piston rod that loads cylinder.The rodless cavity of loading cylinder and rod chamber and test chamber are communicated with hydraulic system respectively by pipeline.
The present invention compares with background technology, and the useful effect that has is:
1) the present invention directly measures according to the definition of elastic modulus, certain volume petrol is exerted pressure, change the size of pressure, obtain the variable quantity of corresponding fluid volume, try to achieve the elastic mould value of fluid by the definition of fluid elastic modulus, directly show or export the elastic modulus signal with electrical secondary system.This device can online in real time detects the elastic mould value of hydraulic system oil liquid automatically, has fundamentally avoided the influence of the friction force of piston and piston rod to measurement result, and measurement result is accurately reliable, and repeatedly duplicate measurements;
2) the tested fluid in this device to test chamber is through the fluid in the round-robin system, can guarantee that measurement result can reflect the actual conditions of fluid in the hydraulic system;
The present invention can the real time automatic detection hydraulic system oil liquid elastic mould value, its detection signal can be directly used in the air content that control removes in the fluid and improve its elastic modulus, realizes the accurate control of hydraulic system oil liquid elastic modulus; This plant automation degree height, detect effectively, be suitable for the hydraulic system applications occasion that control accuracy is had relatively high expectations.
Description of drawings
Accompanying drawing is based on the fluid elastic modulus pick-up unit structure principle chart of bulk modulus definition.
Among the figure: 1. load cylinder, 2. piston and piston rod, 3. test chamber, 4. retaining valve, 5. pressure transducer, 6. built-in displacement transducer, 7. two-position four-way solenoid directional control valve, 8. pilot operated compound relief valve, 9. bi-bit bi-pass solenoid directional control valve, 10. direct-acting overflow valve, 11. bi-bit bi-pass Solenoid ball valves, 12,13,14,15,16,17,18,19,20,21,22,23 is pipeline.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in drawings, the present invention includes: load cylinder 1, piston and piston rod 2, test chamber 3, retaining valve 4, pressure transducer 5, built-in displacement transducer 6; The piston rod that loads in the cylinder 1 extend in the test chamber 3, and can move axially the oil inlet P of retaining valve 4 in test chamber 3 1Be communicated with the oil-out T of retaining valve 4 with the rod chamber that loads cylinder 1 1Be communicated with test chamber 3, pressure transducer 5 is communicated with test chamber 3, and built-in displacement transducer 6 places piston and the piston rod 2 that loads cylinder 1, and the rodless cavity of loading cylinder 1 and rod chamber and test chamber 3 are communicated with hydraulic system respectively by pipeline.
Described hydraulic system comprises: two-position four-way solenoid directional control valve 7, pilot operated compound relief valve 8, bi-bit bi-pass solenoid directional control valve 9, direct-acting overflow valve 10, bi-bit bi-pass Solenoid ball valve 11; The first oil-out B of the two-position four-way solenoid directional control valve 7 in the hydraulic system 1Be communicated with the second oil-out A of two-position four-way solenoid directional control valve 7 by pipeline 15 with the rodless cavity that loads cylinder 1 1Be communicated with the rod chamber that loads cylinder 1 by pipeline 14; The oil return inlet T of two-position four-way solenoid directional control valve 7 2Meet the oil-out T of direct-acting overflow valve 10 5, pilot operated compound relief valve 8 oil-out T 3Oil-out T with bi-bit bi-pass Solenoid ball valve 11 6, the oil inlet P of two-position four-way solenoid directional control valve 7 2Connect the oil inlet P of pilot operated compound relief valve 8 by pipeline 13 and pipeline 17 3, the oil-out T of pilot operated compound relief valve 8 3Meet the oil-out T of bi-bit bi-pass Solenoid ball valve 11 by pipeline 18 6And meet the oil-out T of direct-acting overflow valve 10 by pipeline 21 5, the control mouth X of pilot operated compound relief valve 8 connects the oil inlet P of bi-bit bi-pass solenoid directional control valve 9 by pipeline 19 4, the oil-out T of bi-bit bi-pass solenoid directional control valve 9 4Connect the oil inlet P of direct-acting overflow valve 10 by pipeline 20 5, the oil inlet P of bi-bit bi-pass Solenoid ball valve 11 6Connect the oil-out of test chamber 3 by pipeline 22.
Principle of work of the present invention is as follows:
When changing the tested fluid of test chamber, system pressure oil is 12,13 oil inlet P that flow into two-position four-way solenoid directional control valves 7 by the road 2, this moment two-position four-way solenoid directional control valve 7 electromagnet dead electricity, the oil inlet P of two-position four-way solenoid directional control valve 7 2With oil-out A 1Be communicated with oil return inlet T 2With oil-out B 1Be communicated with, pressure oil is through the oil-out A of two-position four-way solenoid directional control valve 7 1Flow out, enter the rod chamber that loads cylinder 1, promote piston and piston rod 2 and move upward by pipeline 14.When piston and piston rod 2 moved upward, the fluid that loads cylinder 1 rodless cavity is the 15 oil-out B that enter two-position four-way solenoid directional control valve 7 by the road 1, then from the oil return inlet T of two-position four-way solenoid directional control valve 7 2Flow out, 16 flow back to fuel tank by the road at last.Simultaneously, enter the oil inlet P that the part fluid that loads cylinder 1 rod chamber enters retaining valve 4 1, from the oil-out T of retaining valve 4 1Flow into test chamber 3.This moment bi-bit bi-pass Solenoid ball valve 11 electromagnet dead electricity, the oil inlet P of bi-bit bi-pass Solenoid ball valve 11 6With oil-out T 6Be communicated with.Fluid in the test chamber 3 is 22 oil inlet P that enter bi-bit bi-pass Solenoid ball valve 11 by the road 6, from the oil-out T of bi-bit bi-pass Solenoid ball valve 11 6Flow out, 23 flow back to fuel tank by the road.Unnecessary flow flows into the oil inlet P of pilot operated compound relief valve 8 in the system by pipeline 17 3, from the oil-out T of pilot operated compound relief valve 8 3Flow out, 18 flow back to fuel tank by the road, at this moment, the electromagnet dead electricity of bi-bit bi-pass solenoid directional control valve 9 enters pilot operated compound relief valve 8 oil inlet P 3Part fluid flow out 19 oil inlet P that flow into bi-bit bi-pass solenoid directional control valves 9 by the road from control mouthful X 4, from the oil-out T of bi-bit bi-pass solenoid directional control valve 9 4Flow out the oil inlet P that enters direct-acting overflow valve 10 by pipeline 20 5, from the oil-out T of direct-acting overflow valve 10 5Flow out, flow back to fuel tank by pipeline 21.System pressure is exactly the pressure that direct-acting overflow valve 10 is set.
During precompression, the electromagnet of bi-bit bi-pass Solenoid ball valve 11 gets electric, closes bi-bit bi-pass Solenoid ball valve 11.Test chamber 3 pressure raise, and retaining valve 4 is closed.Two-position four-way solenoid directional control valve 7 gets electric, and system pressure oil is the oil inlet P of 12,13 inflow two-position four-way solenoid directional control valves 7 by the road 2, through the oil-out B of two-position four-way solenoid directional control valve 7 1Flow out, enter the rodless cavity that loads cylinder 1, promote piston and piston rod 2 and move downward by pipeline 15.When piston and piston rod 2 moved downward, the fluid that loads cylinder 1 rod chamber is the 14 oil-out A that enter two-position four-way solenoid directional control valve 7 by the road 1, then from the oil return inlet T of two-position four-way solenoid directional control valve 7 2Flow out, 16 flow back to fuel tank by the road at last.When piston and piston rod 2 moved downward, the volume that piston rod enters test chamber 3 increased, and the fluid in the test chamber 3 is compressed volume and reduces, and pressure increases.When piston and piston rod 2 two ends stress balances, piston and piston rod 2 stop motions, the reading P of record pressure transducer 5 this moment 0Reading X with displacement transducer 6 0
When further compressing, the electromagnet of bi-bit bi-pass solenoid directional control valve 9 gets electric, closes bi-bit bi-pass solenoid directional control valve 9.Unnecessary flow flows into the oil inlet P of pilot operated compound relief valve 8 in the system by pipeline 17 3, from the oil-out T of pilot operated compound relief valve 8 3Flow out, 18 flow back to fuel tank by the road.Thereby system pressure is exactly the pressure that pilot operated compound relief valve 8 is set.Under higher system pressure, system pressure oil is the oil inlet P of 12,13 inflow two-position four-way solenoid directional control valves 7 by the road 2, through the oil-out B of two-position four-way solenoid directional control valve 7 1Flow out, enter the rodless cavity that loads cylinder 1, further promote piston and piston rod 2 moves downward by pipeline 15.When piston and piston rod 2 moved downward, the fluid that loads cylinder 1 rod chamber is the 14 oil-out A that enter two-position four-way solenoid directional control valve 7 by the road 1, then from the oil return inlet T of two-position four-way solenoid directional control valve 7 2Flow out, 16 flow back to fuel tank by the road at last.When piston and piston rod 2 moved downward, the volume that piston rod enters test chamber 3 increased, and the fluid in the test chamber 3 is compressed volume and reduces, and pressure increases.When piston and piston rod 2 two ends stress balances, piston and piston rod 2 stop motions, the reading P of record pressure transducer 5 this moment and the reading X of displacement transducer 6.According to formula:
K = V 0 Δp ΔV = V 0 p - p 0 V 0 - V
Calculate the elastic modulus of fluid this moment, show or the output elastic mould value by secondary instrument.
When finishing compression, the electromagnet dead electricity of bi-bit bi-pass solenoid directional control valve 9 is opened bi-bit bi-pass solenoid directional control valve 9.Enter pilot operated compound relief valve 8 oil inlet P 3Part fluid flow out 19 oil inlet P that flow into bi-bit bi-pass solenoid directional control valves 9 by the road from control mouthful X 4, from the oil-out T of bi-bit bi-pass solenoid directional control valve 9 4Flow out the oil inlet P that enters direct-acting overflow valve 10 by pipeline 20 5, from the oil-out T of direct-acting overflow valve 10 5Flow out, flow back to fuel tank by pipeline 21.Thereby system pressure is exactly the pressure that direct-acting overflow valve 10 is set.Under lower system pressure, piston and piston rod 2 lower ends are stressed stressed greater than the upper end, promote piston and piston rod 2 and move upward.The volume of fluid increases in the test chamber 3, and pressure reduces.Then, two-position four-way solenoid directional control valve 7 dead electricity, system pressure oil is the oil inlet P of 12,13 inflow two-position four-way solenoid directional control valves by the road 2, through the oil-out A of two-position four-way solenoid directional control valve 7 1Flow out, enter the rod chamber that loads cylinder 1, promote piston and piston rod 2 and move upward by pipeline 14.When piston and piston rod 2 moved to topmost, the electromagnet dead electricity of bi-bit bi-pass Solenoid ball valve 11 was opened bi-bit bi-pass Solenoid ball valve 11.Fluid in the test chamber 3 is 22 oil inlet P that enter bi-bit bi-pass Solenoid ball valve 11 by the road 6, from the oil-out T of bi-bit bi-pass Solenoid ball valve 11 6Flow out, 23 flow back to fuel tank by the road.Test chamber 3 pressure reduce, and retaining valve 4 is opened.Enter the oil inlet P that the fluid that loads cylinder 1 rod chamber enters retaining valve 4 1, from the oil-out T of retaining valve 4 1Flow into test chamber 3.Fluid in the test chamber 3 is 22 oil inlet P that enter bi-bit bi-pass Solenoid ball valve 11 by the road 6, from the oil-out T of bi-bit bi-pass Solenoid ball valve 11 6Flow out, 23 flow back to fuel tank by the road.
Get back to the state when changing the tested fluid of test chamber this moment again, can repeat above-mentioned steps as required, repeatedly measured the elastic mould value of fluid.

Claims (1)

1, based on the fluid elastic modulus pick-up unit of bulk modulus definition, it is characterized in that: comprise loading cylinder (1), piston and piston rod (2), test chamber (3), retaining valve (4), pressure transducer (5), built-in displacement transducer (6); The piston rod that loads in the cylinder (1) extend in the test chamber (3), and can move axially the oil inlet P of retaining valve (4) in test chamber (3) 1Be communicated with the oil-out T of retaining valve (4) with the rod chamber that loads cylinder (1) 1Be communicated with test chamber (3), pressure transducer (5) is communicated with test chamber (3), built-in displacement transducer (6) places piston and the piston rod (2) that loads cylinder (1), and the rodless cavity of loading cylinder (1) and rod chamber and test chamber (3) are communicated with hydraulic system respectively by pipeline;
Described hydraulic system comprises two-position four-way solenoid directional control valve (7), pilot operated compound relief valve (8), bi-bit bi-pass solenoid directional control valve (9), direct-acting overflow valve (10), bi-bit bi-pass Solenoid ball valve (11); The first oil-out B of the two-position four-way solenoid directional control valve (7) in the hydraulic system 1Be communicated with the second oil-out A of two-position four-way solenoid directional control valve (7) with the rodless cavity that loads cylinder (1) 1Be communicated with the rod chamber that loads cylinder (1); The oil return inlet T of two-position four-way solenoid directional control valve (7) 2Meet the oil-out T of direct-acting overflow valve (10) 5, pilot operated compound relief valve (8) oil-out T 3Oil-out T with bi-bit bi-pass Solenoid ball valve (11) 6, the oil inlet P of two-position four-way solenoid directional control valve (7) 2Connect the oil inlet P of pilot operated compound relief valve (8) 3, the oil-out T of pilot operated compound relief valve (8) 3Meet the oil-out T of bi-bit bi-pass Solenoid ball valve (11) 6And the oil-out T of direct-acting overflow valve (10) 5, the control mouth X of pilot operated compound relief valve (8) connects the oil inlet P of bi-bit bi-pass solenoid directional control valve (9) 4, the oil-out T of bi-bit bi-pass solenoid directional control valve (9) 4Connect the oil inlet P of direct-acting overflow valve (10) 5, the oil inlet P of bi-bit bi-pass Solenoid ball valve (11) 6Connect the oil-out of test chamber (3).
CNB2006100491776A 2006-01-19 2006-01-19 Oil elastic modulus detector based on volume elastic modulus definition Expired - Fee Related CN100439895C (en)

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CN102072219B (en) * 2009-11-19 2014-01-01 煤炭科学研究总院 Quickly loading booster cylinder and high-flow safety valve test device using same
CN102155442B (en) * 2011-03-18 2013-07-31 湖南工程学院 Control loop of adjustable hydraulic loader
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CN103674703B (en) * 2013-12-12 2016-04-20 中国航空工业集团公司第六三一研究所 A kind of liquid volume elastic modulus method of testing and proving installation
CN104897356B (en) * 2014-11-26 2017-11-07 天津航天瑞莱科技有限公司苏州分公司 Hydraulic shock test method
CN109141726A (en) * 2017-06-16 2019-01-04 大陆汽车电子(长春)有限公司 Damper internal pressure measuring apparatus and the method for measuring damper internal pressure
CN108181192B (en) * 2017-12-25 2021-06-08 万向钱潮(上海)汽车系统有限公司 Method for acquiring elastic modulus of brake disc

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