CN107101908A - A kind of capillary water negative pressure Quick testing instrument and its method of work - Google Patents
A kind of capillary water negative pressure Quick testing instrument and its method of work Download PDFInfo
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- CN107101908A CN107101908A CN201710174687.4A CN201710174687A CN107101908A CN 107101908 A CN107101908 A CN 107101908A CN 201710174687 A CN201710174687 A CN 201710174687A CN 107101908 A CN107101908 A CN 107101908A
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- vacuum pumping
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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Abstract
The present invention relates to a kind of capillary water negative pressure Quick testing instrument and its method of work, it is characterised in that：Including water supply tank, test specimen tube, water tank, vavuum pump, controllable vacuum pumping pump and PLC；Pass through PLC and controllable vacuum pumping pump, the extraction flow size of controllable vacuum pumping pump can be determined according to the property of sample, measure osmotic efficiency higher, measure speed faster, B/P EGR Back Pressure Transducer EGR can record the size of negative pressure value in real time by PLC, the negative pressure value of sample any time in capillary water height measurement can be monitored, it is ensured that the accuracy of negative pressure value measurement；The valvular switch of institute in capillary water negative pressure Quick testing instrument can be using control manually or PLC control, and the device can realize the negative pressure value of full-automatic quick measurement capillary water.
Description
Technical field
The present invention relates to soil water layer research field, more particularly to a kind of capillary water negative pressure Quick testing instrument and its work side
Method.
Background technology
Underground water be preservation in rock gap, include in the existence form of rock gap reclaimed water：Jie He Shui ﹑ gravity
Shui ﹑ Mao Xi Shui ﹑ Qi Tai Shui ﹑ solid waters.Capillary water is a kind of existence form of moisture in aeration zone, and the research to capillary water is
The distribution of vadose water and motion study important component.Capillary water height is water in loose rock hole
In, because of the effect of capillary force, risen with certain speed, until reaching the maximum height that capillary rises.Because of entering for underground water
Blend evaporation and transmission moisture is sometimes brought by capillary water.Therefore, the lifting height of capillary water is determined, to Study of The Underground water
Evaporation consumption, the soil salinization improvement has great significance.
Porous media capillary water height and the experiment dress of speed are measured as Chinese patent 201210183001.5 is a kind of
Put, it is characterized in that the device includes water tank, downcomer, downcomer is switched, three-way connection, three-way cock, pressure-measuring pipe, overflow pipe,
Overflow pipe is switched, capillary, lower permeable stone, coarse sand, upper dankness stone, blast pipe switch, blast pipe, and fetch earth stopple, sample, sample
Cylinder, plastic tube, filling pipe, filling pipe switch.
Above-mentioned patent generally directed to be the parameters such as sand, sand, the capillary water height of silt and speed measurement, but
It is the soil for clay property, because the compactness of clay is more than the compactness of sandy soil, silt, using the device in measurement
When, without by the way of vavuum pump, causing, clay capillary water negative pressure is relatively low for general water negative pressure test, and current ooze to clay
Saturating efficiency is low, and osmotic effect is undesirable, and testing efficiency is slow, wastes the substantial amounts of testing time, and the error of test is big.
The content of the invention
, can the technical problem to be solved in the present invention is to provide a kind of capillary water negative pressure Quick testing instrument and its method of work
The capillary water height of various samples is quickly and accurately measured, can be accurately quick particularly in the measure of stickiness soil sample
Acquisition capillary water negative pressure value and accelerate the seepage velocity of current in the sample.
In order to solve the above technical problems, the technical scheme is that：A kind of capillary water negative pressure Quick testing instrument and its work
Make method, its innovative point is：Including water supply tank, test specimen tube, water tank, vavuum pump, controllable vacuum pumping pump and PLC；
The two ends of the water supply tank are respectively arranged with stomata and fluid apertures, and the stomata side of water supply tank is provided with filler；It is described
The stomata of water supply tank is connected with vacuum pumping valve a and vent valve, vacuum pumping valve a by pipeline and is in series with vavuum pump, vacuum pumping valve a
It is in parallel with vent valve；The fluid apertures of the water supply tank is connected by pipeline with the side wall of water tank, the fluid apertures and water tank of water supply tank
Between be provided with vacuum pumping valve b and pipeline between the fluid apertures and vacuum pumping valve b of water supply tank on the pipeline that is connected and be parallel with
Discharging valve a；
The centre of the test specimen tube is provided with the accommodating chamber for accommodating sample, and test specimen tube is located at the top of water tank, and test specimen tube top is set
There is test specimen tube end cap, test specimen tube end cap is provided with sealing ring, and the bottom of test specimen tube is connected by snap joint with water storage upper end；
The top of the water tank is provided with the interface being connected with test specimen tube bottom, the side wall of water tank and had and vacuum pumping valve b
The connected through hole a and through hole b being connected with controllable vacuum pumping pump；The bottom of water tank is provided with through hole c, and the through hole c passes through
Pipeline is connected with a discharging valve b；
The controllable vacuum pumping pump is connected with PLC, and one end of controllable vacuum pumping pump passes through pipeline and water storage pot sidewall
Through hole b is connected.
Further, the pipeline that the controllable vacuum pumping pump is connected with water tank is parallel with B/P EGR Back Pressure Transducer EGR, negative pressure sensing
Device is connected with PLC.
Further, the rate of air sucked in required of the controllable vacuum pumping pump is by PLC control, the extraction flow of controllable vacuum pumping pump
Measure as 0.1-10ml/min.
Further, the negative pressure value of the controllable vacuum pumping pump of the B/P EGR Back Pressure Transducer EGR measurement is connected with PLC, in real time note
Record measurement data.
Further, the vavuum pump, vent valve, vacuum pumping valve a, vacuum pumping valve b, discharging valve a, discharging valve b and controllable
Vacuum pumping pump；It is manually controllable or by PLC control, realize the automation of capillary water negative pressure assay instrument.
The method of work of the capillary water negative pressure Quick testing instrument is as follows：
（1）The end cap on test specimen tube is opened, test specimen tube bottom first is put into last layer aperture will try less than the copper mesh of sample particle
Sample is fitted into test specimen tube, diameter 50mm, high 70mm-80mm, fills sample layered and consolidates；The simple inwall of sample is coated into vaseline,
And sample being cut into identical with test specimen tube diameter, high 70mm-80mm earth pillar is fitted into test specimen tube；The end cap of test specimen tube is covered,
Test specimen tube is set to be connected with water tank；
（2）The filler end cap of water supply tank is opened, the height bonnet upper end cover of water supply tank 2/3 is filled to；
（3）Turn on the power switch, resetted controllable vacuum pumping pump with PLC；
（4）Vacuum pumping valve a, vacuum pumping valve b and vavuum pump are opened, starts to vacuumize；
（5）Vacuumize and terminate after 1-2 hours, close vacuum pumping valve a and vavuum pump；Vent valve is opened, makes the current in water supply tank
Enter in test specimen tube, make to place 17 hours after sample saturation；
（6）Vacuum pumping valve b is closed, test specimen tube end cap is opened, the controllable mL/ of vacuum pumping pump flow 3~6 is adjusted with PLC
Min, opens controllable vacuum pumping pump, and pass through B/P EGR Back Pressure Transducer EGR record data；
（7）When negative pressure value no longer rises, final entry negative pressure value；
（8）Repeat the above steps, determine negative pressure value, take its arithmetic mean of instantaneous value；If result of the test difference is too big twice, it should repeat real
Test；
（9）After experiment terminates, test specimen tube is taken out, discharging valve a and discharging valve b emptying is opened.
The advantage of the invention is that：
1）Controllable vacuum pump controlled by PLC, sample property in test specimen tube determines the extraction flow of vavuum pump
Amount, accelerates current seepage velocity in the sample, it is ensured that the peak suction value of sample is measured during measurement, measurement speed is faster.
2）B/P EGR Back Pressure Transducer EGR can record the size of negative pressure value in real time by PLC, and sample can be monitored in hair
The negative pressure value of any time in thin rise measurement waterborne, it is ensured that the accuracy of negative pressure value measurement.
3）All valves in capillary water negative pressure Quick testing instrument can be using control manually or PLC control, should
Device can realize the negative pressure value of full-automatic quick measurement capillary water；Fast and stable can be provided using controllable vacuum pumping pump
Negative pressure value.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is a kind of structure chart of capillary water negative pressure Quick testing instrument of the present invention.
As shown in Figure 1：1st, water supply tank；11st, stomata；12nd, fluid apertures；13rd, vacuum pumping valve a；14th, vent valve；15th, vacuum pumping valve
b；16th, discharging valve a；17th, discharging valve b；2nd, test specimen tube；3rd, water tank；31st, through hole a；32nd, through hole b；33rd, through hole c；4th, vacuum
Pump；5th, controllable vacuum pumping pump；6th, PLC；7th, filler；8th, B/P EGR Back Pressure Transducer EGR.
Embodiment
The following examples can make professional and technical personnel that the present invention is more fully understood, but therefore not send out this
It is bright to be limited among described scope of embodiments.
A kind of capillary water negative pressure Quick testing instrument as shown in Figure 1 and its method of work, including water supply tank 1, test specimen tube 2,
Water tank 3, vavuum pump 4, controllable vacuum pumping pump 5, PLC 6 and B/P EGR Back Pressure Transducer EGR 8.
The two ends of water supply tank 1 are respectively arranged with stomata 11 and fluid apertures 12, and the stomata side of water supply tank is provided with filler
7；The stomata 11 of the water supply tank 1 is connected with vacuum pumping valve a13 and vent valve 14, vacuum pumping valve a13 by pipeline and is in series with
Vavuum pump 4, vacuum pumping valve a13 and vent valve 14 are in parallel；The fluid apertures 12 of the water supply tank 1 passes through pipeline and the side wall of water tank 3
Vacuum pumping valve b15 is provided with series connection, the pipeline being connected between the fluid apertures 12 and water tank 3 of water supply tank 1 and in the liquid of water supply tank 1
Discharging valve a16 is parallel with pipeline between hole 12 and vacuum pumping valve b15.
The centre of test specimen tube 2 is provided with the accommodating chamber for accommodating sample, and test specimen tube 2 is located at the top of water tank 3, and test specimen tube 2 is pushed up
End is provided with test specimen tube end cap, and test specimen tube end cap is provided with sealing ring, and the bottom of test specimen tube 2 is pushed up by snap joint with water tank 3
End is connected；The top of the water tank 3 be provided with the interface being connected with the bottom of test specimen tube 2, the side wall of water tank 3 have with
The through hole a31 connected vacuum pumping valve b15 and through hole b32 being connected with controllable vacuum pumping pump 5；The bottom of water tank 3 is provided with logical
Hole c33, the through hole c33 is connected with a discharging valve b17 by pipeline.
Controllable vacuum pumping pump 5 is connected with PLC 6, and one end of controllable vacuum pumping pump 5 passes through pipeline and the side of water tank 3
The through hole b32 of wall is connected.
Controllable vacuum pumping pump 5 is parallel with B/P EGR Back Pressure Transducer EGR 8 with the pipeline that water tank 3 is connected, and B/P EGR Back Pressure Transducer EGR 8 and PLC is controlled
Device 6 processed is connected.
The rate of air sucked in required of controllable vacuum pumping pump 5 is controlled by PLC 6, and the extraction flow of controllable vacuum pumping pump 5 is 0.1-
10ml/min。
B/P EGR Back Pressure Transducer EGR 8 measures the negative pressure value of sample and is connected with PLC 6, and measurement data is recorded in real time.
Vavuum pump 4, vent valve 14, vacuum pumping valve a13, vacuum pumping valve b15, discharging valve a16, discharging valve b17 and controllable take out
Vavuum pump 5；It is manually controllable or controlled by PLC 6, realize the automation of capillary water negative pressure assay instrument.
The method of work of the capillary water negative pressure Quick testing instrument is as follows：
（1）The end cap on test specimen tube 2 is opened, the copper mesh that last layer aperture is less than sample particle is first put into test specimen tube bottom, will
Sample is fitted into test specimen tube 2, diameter 50mm, high 70mm-80mm, fills sample layered and consolidates；Simple 2 inwalls of sample are coated into all scholars
Woods, and sample is cut into identical with test specimen tube diameter, high 70mm-80mm earth pillar is fitted into test specimen tube 2；Cover test specimen tube 2
End cap, makes test specimen tube 2 be connected with water tank 3；
（2）The end cap of filler 7 of water supply tank 1 is opened, 2/3 height bonnet upper end cover of water supply tank 1 is filled to；
（3）Turn on the power switch, resetted vavuum pump 4 with PLC 6；
（4）Vacuum pumping valve a13, vacuum pumping valve b15 and vavuum pump 4 are opened, starts to vacuumize；
（5）Vacuumize and terminate after 1-2 hours, close vacuum pumping valve a13 and vavuum pump 4；Vent valve 14 is opened, is made in water supply tank 1
Water flow into test specimen tube 2 in, make after sample saturation place 17 hours；
（6）Vacuum pumping valve b15 is closed, test specimen tube end cap is opened, the controllable flow 3~6 of vacuum pumping pump 5 is adjusted with PLC 6
ML/min, opens controllable vacuum pumping pump 5, and pass through the record data of B/P EGR Back Pressure Transducer EGR 8；
（7）When negative pressure value no longer rises, final entry negative pressure value；
（8）Repeat the above steps, determine negative pressure value, take its arithmetic mean of instantaneous value；If result of the test difference is too big twice, it should repeat real
Test；
（9）After experiment terminates, test specimen tube 2 is taken out, discharging valve a16 and discharging valve b17 emptying is opened.
It should be understood by those skilled in the art that, the present invention is not limited to the above embodiments, above-described embodiment and explanation
Merely illustrating the principles of the invention described in book, without departing from the spirit and scope of the present invention, the present invention also have
Various changes and modifications, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention
By appended claims and its equivalent thereof.
Claims (6)
1. a kind of capillary water negative pressure Quick testing instrument and its method of work, it is characterised in that：Including water supply tank, test specimen tube, water storage
Tank, vavuum pump, controllable vacuum pumping pump and PLC；
The two ends of the water supply tank are respectively arranged with stomata and fluid apertures, and the stomata side of water supply tank is provided with filler；It is described
The stomata of water supply tank is connected with vacuum pumping valve a and vent valve, vacuum pumping valve a by pipeline and is in series with vavuum pump, vacuum pumping valve a
It is in parallel with vent valve；The fluid apertures of the water supply tank is connected by pipeline with the side wall of water tank, the fluid apertures and water tank of water supply tank
Between be provided with vacuum pumping valve b and pipeline between the fluid apertures and vacuum pumping valve b of water supply tank on the pipeline that is connected and be parallel with
Discharging valve a；
The centre of the test specimen tube is provided with the accommodating chamber for accommodating sample, and test specimen tube is located at the top of water tank, and test specimen tube top is set
There is test specimen tube end cap, test specimen tube end cap is provided with sealing ring, and the bottom of test specimen tube is connected by snap joint with water storage upper end；
The top of the water tank is provided with the interface being connected with test specimen tube bottom, the side wall of water tank and had and vacuum pumping valve b
The connected through hole a and through hole b being connected with controllable vacuum pumping pump；The bottom of water tank is provided with through hole c, and the through hole c passes through
Pipeline is connected with a discharging valve b；
The controllable vacuum pumping pump is connected with PLC, and one end of controllable vacuum pumping pump passes through pipeline and water storage pot sidewall
Through hole b is connected.
2. a kind of capillary water negative pressure Quick testing instrument according to claim 1 and its method of work, it is characterised in that：It is described
The pipeline that controllable vacuum pumping pump is connected with water tank is parallel with B/P EGR Back Pressure Transducer EGR, and B/P EGR Back Pressure Transducer EGR is connected with PLC.
3. a kind of capillary water negative pressure Quick testing instrument according to claim 1 and its method of work, it is characterised in that：It is described
The rate of air sucked in required of controllable vacuum pumping pump is by PLC control, and the extraction flow of controllable vacuum pumping pump is 0.1-10ml/min.
4. a kind of capillary water negative pressure Quick testing instrument according to claim 2 and its method of work, it is characterised in that：It is described
The negative pressure value that B/P EGR Back Pressure Transducer EGR measures controllable vacuum pumping pump is connected with PLC, and measurement data is recorded in real time.
5. a kind of capillary water negative pressure Quick testing instrument according to claim 1 and its method of work, it is characterised in that：It is described
Vavuum pump, vent valve, vacuum pumping valve a, vacuum pumping valve b, discharging valve a, discharging valve b and controllable vacuum pumping pump；It is manually controllable or
By PLC control, the automation of capillary water negative pressure assay instrument is realized.
6. a kind of capillary water negative pressure Quick testing instrument according to claim 1 and its method of work, it is characterised in that：The hair
The method of work of thin water negative pressure assay instrument is as follows：
（1）The end cap on test specimen tube is opened, the copper mesh that last layer aperture is less than sample particle is first put into test specimen tube bottom, will be tried
Sample is fitted into test specimen tube, diameter 50mm, high 70mm-80mm, fills sample layered and consolidates；The simple inwall of sample is coated into vaseline,
And sample being cut into identical with test specimen tube diameter, high 70mm-80mm earth pillar is fitted into test specimen tube；The end cap of test specimen tube is covered,
Test specimen tube is set to be connected with water tank；
（2）The filler end cap of water supply tank is opened, the height bonnet upper end cover of water supply tank 2/3 is filled to；
（3）Turn on the power switch, resetted controllable vacuum pumping pump with PLC；
（4）Vacuum pumping valve a, vacuum pumping valve b and vavuum pump are opened, starts to vacuumize；
（5）Vacuumize and terminate after 1-2 hours, close vacuum pumping valve a and vavuum pump；Vent valve is opened, makes the current in water supply tank
Enter in test specimen tube, make to place 17 hours after sample saturation；
（6）Vacuum pumping valve b is closed, test specimen tube end cap is opened, the controllable mL/ of vacuum pumping pump flow 3~6 is adjusted with PLC
Min, opens controllable vacuum pumping pump, and pass through B/P EGR Back Pressure Transducer EGR record data；
（7）When negative pressure value no longer rises, final entry negative pressure value；
（8）Repeat the above steps, determine negative pressure value, take its arithmetic mean of instantaneous value；If result of the test difference is too big twice, it should repeat real
Test；
（9）After experiment terminates, test specimen tube is taken out, discharging valve a and discharging valve b emptying is opened.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710174687.4A CN107101908B (en) | 2017-03-22 | 2017-03-22 | A kind of capillary water negative pressure Quick testing instrument and its working method |
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| CN107101908A true CN107101908A (en) | 2017-08-29 |
| CN107101908B CN107101908B (en) | 2019-10-22 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1346980A1 (en) * | 1986-01-03 | 1987-10-23 | Всесоюзный Научно-Исследовательский Институт Теплоизоляционных И Акустических Строительных Материалов И Изделий | Device for investigating porous specimen |
| US5245859A (en) * | 1992-02-27 | 1993-09-21 | Marathon Oil Company | Method of measuring capillary pressures |
| CN101692035A (en) * | 2009-10-13 | 2010-04-07 | 东南大学 | Capillary soil water climbing height measuring device |
| CN202057270U (en) * | 2011-05-18 | 2011-11-30 | 中水北方勘测设计研究有限责任公司 | Test apparatus for measuring capillary water ascent height in soil |
| CN104251790A (en) * | 2014-10-09 | 2014-12-31 | 中国地质大学（武汉） | Self-water injection type rock and soil sample saturator |
| CN206020233U (en) * | 2016-09-12 | 2017-03-15 | 河海大学 | A kind of soil body osmotic coefficient measurement apparatus for being contemplated that sticking grain silting |
-
2017
- 2017-03-22 CN CN201710174687.4A patent/CN107101908B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1346980A1 (en) * | 1986-01-03 | 1987-10-23 | Всесоюзный Научно-Исследовательский Институт Теплоизоляционных И Акустических Строительных Материалов И Изделий | Device for investigating porous specimen |
| US5245859A (en) * | 1992-02-27 | 1993-09-21 | Marathon Oil Company | Method of measuring capillary pressures |
| CN101692035A (en) * | 2009-10-13 | 2010-04-07 | 东南大学 | Capillary soil water climbing height measuring device |
| CN202057270U (en) * | 2011-05-18 | 2011-11-30 | 中水北方勘测设计研究有限责任公司 | Test apparatus for measuring capillary water ascent height in soil |
| CN104251790A (en) * | 2014-10-09 | 2014-12-31 | 中国地质大学（武汉） | Self-water injection type rock and soil sample saturator |
| CN206020233U (en) * | 2016-09-12 | 2017-03-15 | 河海大学 | A kind of soil body osmotic coefficient measurement apparatus for being contemplated that sticking grain silting |
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