CN103674703B - A kind of liquid volume elastic modulus method of testing and proving installation - Google Patents
A kind of liquid volume elastic modulus method of testing and proving installation Download PDFInfo
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- CN103674703B CN103674703B CN201310681000.8A CN201310681000A CN103674703B CN 103674703 B CN103674703 B CN 103674703B CN 201310681000 A CN201310681000 A CN 201310681000A CN 103674703 B CN103674703 B CN 103674703B
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Abstract
The invention provides a kind of liquid volume elastic modulus method of testing and proving installation, mainly solve prior art carry out liquid volume elastic modulus test time, need to be measured by accurate kapillary pycnometer, cause cost high like this, cycle is long, is difficult to the problem be applied in engineering.This liquid volume elastic modulus proving installation comprises cavity, and cavity top is arranged with the identical piston sleeve of internal diameter and sensor sleeve in parallel; Be provided with piston in described piston sleeve, piston is provided with the piston driver for promoting piston movement away from cavity one end; Sensor is provided with in described sensor sleeve; Described piston, cavity and pressure transducer form a seal cavity.This liquid volume elastic modulus method of testing and proving installation easy device and coordinate the method for this device to achieve measurement to liquid volume elastic modulus, improve testing efficiency.
Description
Technical field
The invention provides a kind of liquid volume elastic modulus method of testing and proving installation.
Background technology
Along with the development of microelectric technique, the power consumption of chip is more and more higher, and traditional natural heat dissipation and the radiating mode of forced air cooling can not solve the heat dissipation problem of chip.Compared with air, specific heat of liquid wants much higher times, and therefore liquid cooling is the better approach solving the heat radiation of large power dissipating chip.
During to chip employing liquid radiating, be generally, at the top of chip, a liquid cooling heat radiator is installed.The liquid coolant that temperature is lower flows into the entrance of liquid cooling heat radiator, after liquid coolant absorbs the heat of chip, then flows out from the outlet of liquid cooling heat radiator, so just reaches the object reducing chip temperature.In order to improve the maintainability of equipment, generally in the gateway of liquid cooling heat radiator, a liquid cooling joint being respectively installed, when needs are safeguarded equipment, just needing the liquid cooling joint between external refrigeration source and liquid cooling heat radiator to disconnect.After liquid cooling joint disconnects, liquid cooling heat radiator inside is filled with liquid coolant.Expand with heat and contract with cold because liquid has, after ambient temperature raises, expansion makes the pressure of heating radiator inside sharply raise by liquid coolant, can damage liquid cooling heat radiator time serious.For avoiding this situation to occur, generally need, on liquid cooling heat radiator, a pressure relief device is installed.When pressure raises, pressure relief device starts, and for liquid coolant provides a space, makes unnecessary liquid be discharged or enter other cavity, liquid coolant so just can be avoided to expand with heat and contract with cold to the destruction of liquid cooling heat radiator.
A pressure relief device reasonable in design must adapt with the withstand voltage of system pressure, cooling fluid properties and heating radiator.The characteristic of liquid coolant mainly refers to the volume change of liquid at some pressure, and physical term is called the bulk modulus of liquid.The bulk modulus of liquid coolant is a Main Basis of design pressure relief device, but the bulk modulus of test liquid coolant is but very difficult, and need to be measured by accurate kapillary pycnometer, it is many constant that this will bring engineer applied to bring.
Summary of the invention
The invention provides a kind of liquid volume elastic modulus method of testing and proving installation, mainly solve prior art carry out liquid volume elastic modulus test time, need to be measured by accurate kapillary pycnometer, cause cost high like this, cycle is long, is difficult to be applied in engineering.
Concrete technical solution of the present invention is as follows:
This liquid volume elastic modulus proving installation comprises cavity, and cavity top is provided with the identical piston sleeve of internal diameter and sensor sleeve, and two sleeves are parallel; Be provided with piston in described piston sleeve, piston is provided with the piston driver for promoting piston movement away from cavity one end; Pressure transducer is provided with in described sensor sleeve; Described piston, cavity and pressure transducer form a seal cavity.
Above-mentioned piston sleeve is also provided with liquid-leaking nozzle, if liquid-leaking nozzle radius is r, the vertical range between liquid-leaking nozzle central shaft and cavity bottom surface is h, pressure transducer locating surface and and cavity bottom surface between vertical range be H, should h-r=H be met; Described pressure transducer locating surface is pressure transducer near the surface of cavity side and liquid comes into contact.
Above-mentioned piston driver is exquisite fine thread post.
This liquid volume elastic modulus method of testing, comprises the following steps:
1] in a seal chamber, pass into fluid to be measured and record the volume V passing into liquid, on this cavity, arrange two sleeves be communicated with cavity, two sleeves are parallel, make liquid level in two sleeves identical simultaneously;
2] apply acting force to the first sleeve, and record to apply after this acting force liquid volume variation delta V in this sleeve; While applying acting force to the first sleeve, measure and record the change value of pressure Δ P in the second sleeve, during measurement, should ensure that in the second sleeve, liquid level does not rise;
3] according to tangent elastic modulus Ev=(V/ Δ V) Δ P, the elastic modulus of liquid is calculated.
Above-mentioned steps 1] in make liquid level in two sleeves specifically identical: a sleeve arranges liquid-leaking nozzle wherein, when liquid level arrive liquid-leaking nozzle position time, liquid level no longer rises.
Above-mentioned steps 2] apply acting force specifically to the first sleeve: the piston driver being provided with piston and driven plunger motion in the first sleeve, rotor-drive slowly, move down slowly to make piston, when the bottom surface of piston and liquid-leaking nozzle is in same level, piston starts to press to fluid to be measured; Often revolve the piston driver that turns around, the distance that piston moves down is a closely-pitched pitch p, then according to the diameter D of piston sleeve, calculates liquid by the volume delta V compressed, is the changing value of liquid volume, Δ V=0.25* π * D
2* p*n, wherein n is the number of turns of rotor-drive;
Above-mentioned steps 2] in measure and record the change value of pressure Δ P in the second sleeve, should ensure during measurement that in the second sleeve, liquid level does not rise specifically: the pressure being obtained fluid to be measured by the pressure transducer be arranged in the second sleeve, along with the increase of piston driver rotating cycle, obtain different force value, and be recorded in different piston driver rotating cycle n and corresponding pressure value P.
Advantage of the present invention is as follows:
This liquid volume elastic modulus method of testing and proving installation are by a kind of easy device and coordinate the method for this device to achieve measurement to liquid volume elastic modulus, improve testing efficiency.
Accompanying drawing explanation
Fig. 1 is principle of the invention schematic diagram;
Accompanying drawing is detailed as follows: 1-piston driver; 2-piston; 3-piston sleeve; 4-cavity; 5-liquid-leaking nozzle; 6-pressure transducer; 7-sensor sleeve;
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
This liquid volume elastic modulus proving installation comprises cavity, and cavity top is arranged with the identical piston sleeve of internal diameter and sensor sleeve in parallel; Be provided with piston in piston sleeve, piston is provided with the piston driver for promoting piston movement away from cavity one end; Sensor is provided with in sensor sleeve; Piston, cavity and pressure transducer form a seal cavity.Piston sleeve is also provided with liquid-leaking nozzle, if liquid-leaking nozzle radius is r, the vertical range between liquid-leaking nozzle central shaft and cavity bottom surface is h, pressure transducer locating surface and and cavity bottom surface between vertical range be H, should h-r=H be met; Pressure transducer locating surface is pressure transducer near the surface of cavity side and liquid comes into contact.
Be be inversely proportional to its bulk modulus according to the compressibility of the known liquid of the definition of hydroelasticity modulus, modulus is defined as: Ev=(V/ Δ V) Δ P, and wherein, V is total liquid volume, and Δ V is the changing value of liquid, and Δ P is the changing value of pressure;
As shown in Figure 1, first, the piston of liquid volume elastic modulus proving installation and drive unit and pressure are dismantled, then in the sleeve installing piston, constantly inject liquid, when liquid level reaches the liquid outflow port of piston sleeve sidewall, liquid level would not rise.Because the structure of hydroelasticity modulus is fixed, the volume V of liquid is fixing.
Secondly, pressure transducer be arranged on the sleeve of pressure transducer and tighten, because the locating surface of pressure transducer and the liquid-leaking nozzle bottom surface of piston sleeve are on a surface level, so can ensure that volume V is fixing.
Rotor-drive slowly, to make piston move down slowly, when piston and datum line (bottom surface of liquid-leaking nozzle) are in same level, piston starts to press to fluid to be measured.
Due to piston sleeve employing is exquisite fine thread structure, can ensure that the elastic force of fluid to be measured can not make piston move up, often revolve the piston driver that turns around, the distance that piston moves down is a closely-pitched pitch p, then according to the diameter D of piston sleeve, liquid can be calculated by the volume delta V compressed, be the changing value of liquid volume, Δ V=0.25* π * D2*p*n, wherein n is the number of turns of rotor-drive.
At the other end, the pressure of now fluid to be measured can be obtained by pressure transducer, along with the increase of piston driver rotating cycle, obtain different force value, and be recorded in different piston driver rotating cycle n and corresponding pressure value P.
Finally, according to tangent elastic modulus Ev=(V/ Δ V) Δ P, the elastic modulus of liquid can be calculated.
In order to improve the accuracy of test, following problem should be noted:
Prevent pressure from making cavity produce distortion thus affecting the accuracy of experimental data, cavity thickness should be made comparatively large, ensure that cavity has the ability of enough resistance to deformations; Cavity volume should be comparatively large, and the diameter of sleeve should be less; Leak out from piston or pressure transducer to prevent fluid to be measured, piston sleeve and piston, quality of fit between sensor sleeve and sensor should be improved as far as possible, piston driver and sleeve should adopt accurate fine thread to coordinate, and ensure its quality of fit; The bottom of liquid-leaking nozzle should be maintained at the same horizontal plane with the installation bottom surface of pressure transducer.
Claims (7)
1. a liquid volume elastic modulus proving installation, is characterized in that: comprise cavity, and described cavity top is provided with the identical piston sleeve of internal diameter and sensor sleeve, and two sleeves are parallel; Be provided with piston in described piston sleeve, piston is provided with the piston driver for promoting piston movement away from cavity one end; Pressure transducer is provided with in described sensor sleeve; Described piston, cavity and pressure transducer form a seal cavity.
2. liquid volume elastic modulus proving installation according to claim 1, it is characterized in that: described piston sleeve is also provided with liquid-leaking nozzle, if liquid-leaking nozzle radius is r, vertical range between liquid-leaking nozzle central shaft and cavity bottom surface is h, pressure transducer locating surface and and cavity bottom surface between vertical range be H, should h-r=H be met; Described pressure transducer locating surface is pressure transducer near the surface of cavity side and liquid comes into contact.
3. liquid volume elastic modulus proving installation according to claim 1 and 2, is characterized in that: described piston driver is exquisite fine thread post.
4. a liquid volume elastic modulus method of testing, is characterized in that, comprises the following steps:
1] in a seal chamber, pass into fluid to be measured and record the volume V passing into liquid, on this cavity, arrange two sleeves be communicated with cavity, two sleeves are parallel, make liquid level in two sleeves identical simultaneously;
2] apply acting force to the first sleeve, and record to apply after this acting force liquid volume variation delta V in this sleeve; While applying acting force to the first sleeve, measure and record the change value of pressure Δ P in the second sleeve, during measurement, should ensure that in the second sleeve, liquid level does not rise;
3] according to tangent elastic modulus Ev=(V/ Δ V) Δ P, the elastic modulus of liquid is calculated.
5. liquid volume elastic modulus method of testing according to claim 4, it is characterized in that: described step 1] in make liquid level in two sleeves specifically identical: a sleeve arranges liquid-leaking nozzle wherein, when liquid level arrives liquid-leaking nozzle position, liquid level no longer rises.
6. liquid volume elastic modulus method of testing according to claim 5, it is characterized in that: described step 2] apply acting force specifically to the first sleeve: the piston driver being provided with piston and driven plunger motion in the first sleeve, rotor-drive slowly, move down slowly to make piston, when the bottom surface of piston and liquid-leaking nozzle is in same level, piston starts to press to fluid to be measured; Often revolve the piston driver that turns around, the distance that piston moves down is a closely-pitched pitch p, then according to the diameter D of piston sleeve, calculates liquid by the volume delta V compressed, is the changing value of liquid volume, Δ V=0.25* π * D
2* p*n, wherein n is the number of turns of rotor-drive.
7. liquid volume elastic modulus method of testing according to claim 6, it is characterized in that: described step 2] in measure and record the change value of pressure Δ P in the second sleeve, should ensure during measurement that in the second sleeve, liquid level does not rise specifically: the pressure being obtained fluid to be measured by the pressure transducer be arranged in the second sleeve, along with the increase of piston driver rotating cycle, obtain different force value, and be recorded in different piston driver rotating cycle n and corresponding pressure value P.
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| CN108254255B (en) * | 2016-12-29 | 2024-01-30 | 中国科学院沈阳自动化研究所 | Device and method for measuring volumetric elastic modulus of oil liquid under high pressure state |
| CN108760519B (en) * | 2018-07-26 | 2019-04-12 | 中国人民解放军海军工程大学 | A kind of oil liquid bulk modulus detection sensor and detection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3477277A (en) * | 1967-11-30 | 1969-11-11 | Sinclair Research Inc | Apparatus for continuously determining the adiabatic bulk modulus of a liquid within a pipeline |
| CN1804576A (en) * | 2006-01-19 | 2006-07-19 | 浙江大学 | Oil elastic modulus detector based on volume elastic modulus definition |
| CN103267681A (en) * | 2013-04-25 | 2013-08-28 | 同济大学 | Method and device for measuring oil volume elastic modulus |
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2013
- 2013-12-12 CN CN201310681000.8A patent/CN103674703B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3477277A (en) * | 1967-11-30 | 1969-11-11 | Sinclair Research Inc | Apparatus for continuously determining the adiabatic bulk modulus of a liquid within a pipeline |
| CN1804576A (en) * | 2006-01-19 | 2006-07-19 | 浙江大学 | Oil elastic modulus detector based on volume elastic modulus definition |
| CN103267681A (en) * | 2013-04-25 | 2013-08-28 | 同济大学 | Method and device for measuring oil volume elastic modulus |
Non-Patent Citations (1)
| Title |
|---|
| 油液体积弹性模量检测装置的结构设计及有限元分析;冯斌等;《机床与液压》;20070531;第35卷(第5期);177-179 * |
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