CN113654968A - Low-permeability medium gas permeability testing device and installation and testing method thereof - Google Patents
Low-permeability medium gas permeability testing device and installation and testing method thereof Download PDFInfo
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- CN113654968A CN113654968A CN202111002161.0A CN202111002161A CN113654968A CN 113654968 A CN113654968 A CN 113654968A CN 202111002161 A CN202111002161 A CN 202111002161A CN 113654968 A CN113654968 A CN 113654968A
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- 238000012360 testing method Methods 0.000 title claims abstract description 98
- 230000035699 permeability Effects 0.000 title claims abstract description 55
- 238000009434 installation Methods 0.000 title abstract description 9
- 238000003860 storage Methods 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims description 47
- 239000003921 oil Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 24
- 239000010720 hydraulic oil Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 19
- 230000008859 change Effects 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 238000004378 air conditioning Methods 0.000 claims 2
- 238000005253 cladding Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 311
- 238000004364 calculation method Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a hypotonic medium gas permeability testing device and an installation and testing method thereof, wherein the testing device comprises: the cylinder body is provided with an air inlet pipeline and a hydraulic pipeline; the cover body is covered on the open end of the cylinder body, and an air outlet pipeline and an air pressure balance hole are arranged on the cover body; the tested sample is adapted between the air inlet pipeline and the air outlet pipeline in the accommodating cavity; the cladding assembly is cladded and sealed at the outer side of the sample to be tested; a pressure-controllable oil pump which is communicated with the outer end side of the hydraulic pipeline; a high pressure gas cylinder having a source of high pressure gas; one end of the buffer gas cylinder is communicated with the high-pressure gas storage cylinder, and the other end of the buffer gas cylinder is communicated with the outer end side of the gas inlet pipeline; the gas cylinder is characterized by comprising a first gas circuit valve, a second gas circuit valve and a third gas circuit valve, wherein the first gas circuit valve is arranged between the high-pressure gas cylinder and the buffer gas cylinder, and the second gas circuit valve and the third gas circuit valve are arranged between the buffer gas cylinder and the outer end side of the gas inlet pipeline. The testing device can effectively test the permeability of the tested sample.
Description
Technical Field
The invention relates to the field of rock and soil material testing, in particular to a low-permeability medium gas permeability testing device and an installation and testing method thereof.
Background
Geotechnical materials are important materials for infrastructure construction, and thus are widely used in engineering production and scientific research. In some engineering constructions, e.g. landfill sites, hydraulic works construction, CO2In geological sealing and other engineering, the permeability needs to be researched and measured. Among them, bentonite, which is a blocking shielding material, has been widely studied and used because it swells in water to compress the pore space and thus its permeability is reduced. However, in the existing work, conventional rock and soil materials are mostly measured and analyzed, devices and methods facing hypotonic media are few, and the devices and the methods are difficult to be suitable for testing tasks with low permeability and long permeation time. The existing device for measuring the hypotonic medium is difficult to efficiently record permeability data in real time, or has single function, and the deformation condition of a sample in the test process cannot be recorded and stored. Therefore, a new matching device and a reliable testing method are needed in the subdivision field.
Disclosure of Invention
The present invention is directed to a device for testing gas permeability of a hypotonic medium, which can achieve the above technical objects and achieve other technical effects by adopting the following technical features.
According to a first aspect of the present invention, a hypotonic media gas permeability test apparatus comprises:
the cylinder body defines an accommodating cavity with one open end, and an air inlet pipeline and a hydraulic pipeline which are communicated with the accommodating cavity of the cylinder body are arranged on the cylinder body;
the cover body is detachably arranged at the open end of the cylinder body in a covering manner so as to seal the accommodating cavity, and an air outlet pipeline and an air pressure balance hole which are communicated with the accommodating cavity are arranged on the cover body; wherein the air pressure balance hole is sealed by an air pressure balance bolt;
the tested sample is adapted between the air inlet pipeline and the air outlet pipeline in the accommodating cavity;
the cladding assembly is cladded and sealed at the outer side of the tested sample, and at least seals the connecting parts between the tested sample and the air inlet pipeline and between the tested sample and the air outlet pipeline;
the pressure controllable oil pump is communicated with the outer end side of the hydraulic pipeline and is used for pumping hydraulic oil with adjustable pressure into the accommodating cavity;
a high pressure gas cylinder having a source of high pressure gas;
one end of the buffer gas cylinder is communicated with the high-pressure gas storage cylinder, and the other end of the buffer gas cylinder is communicated with the outer end side of the gas inlet pipeline;
first gas circuit valve, second gas circuit valve and third gas circuit valve, first gas circuit valve sets up high-pressure gas bomb with between the buffer gas cylinder, second gas circuit valve and third gas circuit valve set up buffer gas cylinder with between the outer end side of air inlet pipeline, wherein, second gas circuit valve is close to the buffer gas cylinder sets up, third gas circuit valve is close to the outer end side setting of air inlet pipeline.
In one example of the present invention, the sheathing assembly includes:
the base is formed at the bottom of the cylinder body, the sample to be tested is matched on the base, and the air inlet pipeline penetrates through the base and extends to the lower end of the sample to be tested;
the pressing block is pressed on the upper end of the tested sample, and the air outlet pipeline penetrates through the pressing block and extends to the upper end of the tested sample;
and the sealing sleeve is coated and sealed on the outer side of the tested sample, and the upper end and the lower end of the sealing sleeve respectively extend to the pressing block and the base so as to seal the connecting part between the tested sample and the base and the connecting part between the tested sample and the pressing block.
In one example of the present invention, the sheathing assembly further comprises:
and the filter plates are respectively matched between the pressing block and the tested sample and between the base and the tested sample and used for filtering impurity particles.
In one example of the invention, the filter plate is a permeable stone.
In one example of the invention, the sealing sleeve comprises:
the rubber sleeve is coated on the outer side of the tested sample, and the upper end and the lower end of the rubber sleeve respectively extend to the pressing block and the base;
and the at least two binding hoops are respectively fastened on the outer sides of the rubber sleeve positioned on the base and the pressing block.
In one example of the invention, the outer diameters of the base, the pressing block and at least the part of the sample to be tested, which is wrapped by the wrapping component, are equal.
In one example of the present invention, the method further comprises: a circular deformation meter is arranged on the outer side of the circular deformation meter,
and the sleeve is sleeved on the outer side of the tested sample and used for measuring the annular deformation of the tested sample.
In one example of the present invention, the method further comprises: at least two air pressure gauges are arranged on the air pressure gauge,
at least one of the air passage valves is arranged between the first air passage valve and the buffer air bottle, and at least another one of the air passage valves is arranged between the second air passage valve and the third air passage valve.
The installation method of the hypotonic medium gas permeability testing device according to the second aspect of the invention comprises the following steps:
s10: placing the cylinder body on a horizontal plane, placing the sample to be tested on a base, and arranging a pressing block at the upper end of the sample to be tested;
s20: covering a rubber sleeve on the outer side of the tested sample, respectively extending the upper end and the lower end of the rubber sleeve to the pressing block and the base, and respectively fastening the rubber sleeve on the outer sides of the base and the pressing block by using at least two binding hoops;
s30: covering the open end of the cylinder body with the cover body, and hermetically connecting the cover body and the cylinder body by using a fastener; the gas outlet pipeline is adjustably arranged on the cover body, the gas outlet pipeline integrally connected with the pressing block is adjusted before the cover body is covered on the open end of the cylinder body, so that the pressing block is connected to the upper end of the sample to be tested, and the part of the gas outlet pipeline connected with the cover body is adjusted and sealed after the cover body is covered on the open end of the cylinder body;
s40: the gas cylinder is characterized in that a buffer gas cylinder and a high-pressure gas cylinder are sequentially connected to the outer end side of the gas inlet pipeline, wherein a first gas circuit valve is arranged between the high-pressure gas cylinder and the buffer gas cylinder, a second gas circuit valve and a third gas circuit valve are arranged between the buffer gas cylinder and the outer end side of the gas inlet pipeline, the second gas circuit valve is close to the buffer gas cylinder, and the third gas circuit valve is close to the outer end side of the gas inlet pipeline.
According to the third aspect of the invention, the testing method of the hypotonic medium gas permeability testing device comprises the following steps:
s110: opening the air pressure balance bolt to enable the accommodating cavity to be communicated with the outside through the air pressure balance hole, simultaneously opening the pressure-controllable oil pump to inject hydraulic oil into the accommodating cavity until the hydraulic oil flows out of the air pressure balance hole, closing the air pressure balance bolt, and adjusting and controlling the pressure-controllable oil pump to increase the oil pressure in the accommodating cavity to a preset measurement confining pressure pc；
S120: opening the first gas circuit valve to close the second gas circuit valve and the third gas circuit valve, so that the high-pressure gas source in the high-pressure gas storage bottle has an inlet volume v1Until the value of the barometer between the first gas circuit valve and the buffer gas cylinder reaches the gas pressure p1Closing the first air circuit valve;
s130: opening the second gas circuit valve until the gas pressure meter between the second gas circuit valve and the third gas circuit valve is equal to the gas pressure meter between the first gas circuit valve and the buffer gas cylinder in value and keeps stable, and then closing the second gas circuit valveReading the value of the barometer to be p2(ii) a Thereby obtaining the gas volume v between the third gas path valve and the second gas path valve2：
S140: opening a third gas circuit valve, enabling gas between the third gas circuit valve and the second gas circuit valve to slowly flow through the tested sample through a gas inlet pipeline, finally discharging the gas into the air through a gas outlet pipeline, recording data change of a gas pressure meter between the second gas circuit valve and the third gas circuit valve in the whole process, and calculating a data mean value p in the periodmean-aAnd the amount of change in gas pressure Δ paThe time consumed by opening the third gas circuit valve is delta t; gas permeability k based on inlet end pressure1The formula is as follows:
wherein mu is the viscosity coefficient of the test gas, h and A are the height and cross-sectional area of the sample, and p0Is at atmospheric pressure;
s150: and opening the air pressure balance bolt, extracting hydraulic oil in the cylinder by using the pressure controllable oil pump, and detaching the testing device and taking down the tested sample after extraction is finished.
According to the third aspect of the invention, the testing device comprises a substitute sample, the substitute sample is a compact material and is provided with a through hole penetrating through the extension direction of the substitute sample, two ends of the through hole are respectively communicated with the air inlet pipeline and the air outlet pipeline, wherein an air pressure gauge and a fourth air path valve are sequentially arranged on the air outlet pipeline positioned at the upper end of the cover body from bottom to top; wherein the volume of the through hole is v4；
The test method comprises the following steps:
s210: opening the air pressure balance bolt to make the containing cavity communicated with the outside through the air pressure balance hole, and simultaneously opening the pressure controllable oil pump to inject the oil into the containing cavityThe hydraulic oil flows out from the air pressure balance hole, the air pressure balance bolt is closed, and the pressure controllable oil pump is adjusted and controlled to increase the oil pressure in the containing cavity to the preset measurement and calculation confining pressure pc；
S220: opening the first gas circuit valve to close the second gas circuit valve and the third gas circuit valve, so that the high-pressure gas source in the high-pressure gas storage bottle has an inlet volume v1Until the value of the barometer between the first gas circuit valve and the buffer gas cylinder reaches the gas pressure p1Closing the first air circuit valve;
s230: opening the second gas circuit valve until the gas pressure meter between the second gas circuit valve and the third gas circuit valve is equal to the gas pressure meter between the first gas circuit valve and the buffer gas cylinder in value and keeps stable, closing the second gas circuit valve, and reading the gas pressure meter to be p2(ii) a Thereby obtaining the gas volume v between the third gas path valve and the second gas path valve2：
Then the third gas circuit valve is opened, and the value of the pressure indicator between the second gas circuit valve and the third gas circuit valve is read as p after the pressure indicator is stable3The volume v of the gas path between the second gas path valve and the lower end of the substitute sample3Comprises the following steps:
s240: opening the first gas circuit valve to close the second gas circuit valve, the third gas circuit valve and the fourth gas circuit valve, so that the high-pressure gas source in the high-pressure gas storage bottle has an entering volume v1Until the value of the barometer between the first gas circuit valve and the buffer gas cylinder reaches the gas pressure p1Closing the first air circuit valve; then the second gas path valve and the third gas path valve are opened, the high-pressure gas source is diffused to the fourth gas path valve on the cylinder cover, and the value of the fourth gas path valve is read as p after the value of the barometer is stable5(ii) a The volume v of the gas outlet pipeline (replacing the upper end surface of the sample to a fourth gas path valve above the cover body)5Comprises the following steps:
s250: disassembling the testing device, taking out the substitute sample, and installing the sample to be tested in the testing device according to the installation method of the testing device;
s260: opening the first air path valve and the fourth air path valve to close the second air path valve and the third air path valve, so that the high-pressure gas source in the high-pressure gas storage bottle has an entering volume v1After the barometer is stabilized, a first air circuit valve is closed; opening a second gas circuit valve, and closing the second gas circuit valve after the gas pressure indicating number is stable; then opening a third gas path valve, reading the value of the barometer after a few seconds as p6As the initial pressure of the inlet end, the gas slowly flows through the tested sample through the gas inlet pipeline, is discharged into the air through the gas outlet pipeline, records the data change of a barometer on the gas outlet pipeline in the whole course, and calculates the data mean value p in the periodmean-bAnd the amount of change in gas pressure Δ pbThe time consumed by opening the third gas circuit valve is delta t; the gas permeability equation based on the outlet end pressure is then:
wherein mu is the viscosity coefficient of the test gas, h and A are the height and cross-sectional area of the sample, and p0Is at atmospheric pressure;
s260: and opening the air pressure balance bolt, extracting hydraulic oil in the cylinder by using the pressure controllable oil pump, and detaching the testing device and taking down the tested sample after extraction is finished.
The following description of the preferred embodiments for carrying out the present invention will be made in detail with reference to the accompanying drawings so that the features and advantages of the present invention can be easily understood.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the invention and are not to be construed as limiting the invention to all embodiments thereof.
FIG. 1 is a front view of a hypotonic media gas permeability test apparatus according to one embodiment of the present invention;
FIG. 2 is a perspective view of a hypotonic media gas permeability test apparatus according to one embodiment of the present invention;
FIG. 3 is a front view of a hypotonic media gas permeability test apparatus according to another embodiment of the present invention.
List of reference numerals:
a test apparatus 100;
a cylinder block 110;
a housing cavity 111;
an air intake conduit 112;
a hydraulic line 113;
a cover 120;
an outlet pipeline 121;
a gas pressure balance hole 122;
air pressure balance bolts 123;
a sample under test 130;
a sheathing member 140;
a base 141;
a pressing block 142;
a sealing sleeve 143;
a rubber sleeve 1431;
a binding band 1432;
a filter plate 144;
a pressure-controllable oil pump 150;
a high pressure gas cylinder 160;
a buffer gas cylinder 170;
a first air passage valve 180;
a second gas circuit valve 190;
a third gas circuit valve 200;
a hoop strain gauge 210;
a gas pressure gauge 220;
a bolt fastener 230;
the seal 240 is adjusted;
and a fourth air passage valve 250.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
A hypotonic media gas permeability test apparatus 100 according to a first aspect of the present invention, as shown in fig. 1, 2 and 3, comprises:
a cylinder body 110 defining an accommodating cavity 111 with one open end, the cylinder body 110 being provided with an air inlet pipeline 112 and a hydraulic pipeline 113 communicated with the accommodating cavity 111; that is, a high-pressure gas source is supplied into the cylinder 110 through the intake line 112, and hydraulic oil is supplied through the hydraulic line 113;
the cover body 120 is detachably covered on the open end of the cylinder body 110 to seal the accommodating cavity 111, and an air outlet pipeline 121 and an air pressure balance hole 122 which are communicated with the accommodating cavity 111 are arranged on the cover body 120; wherein, the air pressure balance hole 122 is sealed by an air pressure balance bolt 123; for example, the cover 120 and the cylinder block 110 are fixedly coupled by the bolt fastener 230, that is, a plurality of first positioning holes are disposed at equal intervals along the circumferential direction of the cover 120, a plurality of second positioning holes are disposed along the circumferential direction of the cylinder block 110, the bolt fastener 230 is sequentially inserted through the first positioning holes and the second positioning holes, and the cover 120 can be sealingly coupled to the cylinder block 110 by the bolt fastener 230.
A sample under test 130 fitted between said inlet line 112 and said outlet line 121 in said housing chamber 111; that is, a high-pressure gas source is input from the gas inlet line 112, flows through the sample 130 to be tested and flows out from the gas outlet line 121, so as to calculate the permeability of the sample 130 to be tested;
a packing member 140 that is packed and sealed outside the sample under test 130 and seals at least the connection portions between the sample under test 130 and the inlet pipe 112 and between the sample under test 130 and the outlet pipe 121; in other words, since the sample 130 itself has permeability, when the high pressure gas source flows through the sample 130, the sample 130 needs to be sealed to prevent the high pressure gas source flowing through the sample 130 from leaking to affect the measured permeability; meanwhile, since there are joints between the sample under test 130 and the inlet pipe 112 and the outlet pipe 121, in order to prevent the high-pressure gas source from leaking at the joints, the wrapping member 140 also wraps the joints, so that the whole body is sealed.
A pressure-controllable oil pump 150 that is communicated with an outer end side of the hydraulic line 113 and pumps hydraulic oil of which pressure is adjustable into the accommodation chamber 111;
a high pressure gas cylinder 160 having a high pressure gas source; for example, the high pressure gas source is an inert gas.
A buffer gas cylinder 170 having one end communicating with the high-pressure gas cylinder 160 and the other end communicating with the outer end side of the gas inlet pipe 112; the provision of the buffer gas cylinder 170 provides a buffer for the source of high pressure gas and provides conditions for the following calculation of permeability since the volume of the buffer gas cylinder 170 is a known quantity.
A first air path valve 180, a second air path valve 190 and a third air path valve 200, wherein the first air path valve 180 is disposed between the high-pressure gas cylinder 160 and the buffer gas cylinder 170, and the second air path valve 190 and the third air path valve 200 are disposed between the buffer gas cylinder 170 and the outer end side of the air inlet pipeline 112, wherein the second air path valve 190 is disposed close to the buffer gas cylinder 170, and the third air path valve 200 is disposed close to the outer end side of the air inlet pipeline 112;
when the testing device 100 is used, the volume and the pressure value of the high-pressure gas source in the injection accommodating cavity 111 need to be known; to obtain the above value, the first air path valve 180 is opened to close the second air path valve 190 and the third air path valve 200, so that the high pressure gas source in the high pressure gas cylinder 160 has an inlet volume v1Until the value of the gas pressure gauge 220 between the first gas circuit valve 180 and the buffer gas cylinder 170 reaches the gas pressure p1Closing the first air passage valve 180; then, the second air path valve 190 is opened again until the air pressure gauge 220 between the second air path valve 190 and the third air path valve 200 is equal to the air pressure gauge 220 between the first air path valve 180 and the buffer gas cylinder 170 in value and keeps stable, the second air path valve 190 is closed, and the value of the air pressure gauge 220 is read as p2(ii) a Thereby obtaining the gas volume v between the third gas path valve 200 and the second gas path valve 1902: finally, the third air path valve 200 is opened, and the air between the third air path valve 200 and the second air path valve 190 slowly flows through the sample 130 to be tested via the air inlet pipeline 112 and is finally discharged to the air outlet pipeline 121Recording the data change of the barometer 220 between the second air path valve 190 and the third air path valve 200 in the air in the whole process, and calculating the data mean value p in the periodmeanAnd the gas pressure variation delta p, the time consuming delta t for opening the third gas circuit valve 200; the permeability of the sample 130 can thus be calculated; the testing device 100 can effectively test the permeability of the tested sample 130, and has high accuracy and high reliability of the measurement result. It can be understood that, in order to reduce the measurement error, the first air passage valve 180 and the second air passage valve 190 are respectively disposed close to the buffer gas cylinder 170, and the volume of the buffer gas cylinder 170 is much larger than the pipeline portion between the buffer gas cylinder 170 and the first air passage valve 180 and the pipeline portion between the buffer gas cylinder 170 and the second air passage valve 190.
In one example of the present invention, the sheathing assembly 140 includes:
a base 141 formed at the bottom of the cylinder 110, wherein the sample 130 to be tested is fitted on the base 141, and the air inlet pipeline 112 penetrates through the base 141 and extends to the lower end of the sample 130 to be tested;
a pressing block 142, which is pressed on the upper end of the sample 130 to be tested, and the gas outlet pipeline 121 penetrates through the pressing block 142 and extends to the upper end of the sample 130 to be tested;
a sealing sleeve 143 that is wrapped and sealed on the outer side of the sample under test 130, and has upper and lower ends respectively extending to the pressing block 142 and the base 141 to seal a connection portion between the sample under test 130 and the base 141 and a connection portion between the sample under test 130 and the pressing block 142;
the base 141 is arranged at the bottom of the cylinder body 110, so that the sample 130 to be tested can be placed conveniently, the sample 130 to be tested is supported, the pressing block 142 is pressed at the upper end of the sample 130 to be tested on one hand, so that the stability of the sample 130 to be tested is kept, transition connection between the sample 130 to be tested and the gas outlet pipeline 121 can be facilitated on the other hand, the sealing sleeve 143 can effectively form a whole and is in sealing connection among the sample 130 to be tested, the pressing block 142 and the base 141, and therefore a high-pressure gas source cannot leak when a penetration test is performed.
In one example of the present invention, the sheathing assembly 140 further includes:
a filter plate 144, the filter plate 144 being respectively fitted between the pressing block 142 and the sample under test 130, and between the base 141 and the sample under test 130, for filtering foreign particles;
that is to say, the high pressure gas source enters the accommodating cavity 111 through the gas inlet pipe 112, then flows into the sample 130 to be tested through the filtering action of the filter plate 144, and then flows into the gas outlet pipe 121 through the sample 130 to be tested, and the high pressure gas source can be effectively filtered through the filter plate 144, so that the precision of the permeability of the test sample is improved.
Preferably, the filter plate 144 is a permeable stone.
In one example of the present invention, the sealing sleeve 143 includes:
the rubber sleeve 1431 covers the outer side of the sample under test 130, and the upper end and the lower end of the rubber sleeve respectively extend to the pressing block 142 and the base 141;
at least two tie-hoops 1432 respectively fastened on the outer sides of the rubber sleeve 1431 on the base 141 and the pressing block 142;
that is to say, the rubber sleeve 1431 is covered on the outer side of the sample 130 to be tested, and can extend upwards and downwards to the pressing block 142 and the base 141, and then the rubber sleeve 1431 is fixedly connected to the base 141 and the pressing block 142 through the binding band 1432, so that the sealing sleeve 143 can form a sealed whole with the sample 130 to be tested, and when the high-pressure gas source circulates to the sample 130 to be tested, the leakage phenomenon cannot occur.
In one example of the present invention, the outer diameters of the base 141, the pressing block 142, and at least the portion of the sample under test 130 wrapped by the wrapping member 140 are equal;
when the base 141, the press block 142, and the sample 130 are coated in this way, the coating module 140 can enhance the sealing performance of the sample 130 by enhancing the adhesion between the three components.
In one example of the present invention, the method further comprises: the circumferential deformer 210 is a single-piece,
the measuring device is sleeved on the outer side of the sample to be tested 130 and used for measuring the annular deformation of the sample to be tested 130;
specifically, the circumferential deformation meter 210 is tightly wound outside the sample during testing, the reserved interface on the cylinder body 110 is conveniently inserted into the wire harness, the wire harness is coupled with a computer to record and display the circumferential deformation of the sample in real time, and the circumferential deformation of the tested sample 130 can be measured, so that the permeability measurement and process circumferential deformation recording functions are provided for the research of low-permeability rock and soil materials.
In one example of the present invention, the method further comprises: at least two gas pressure gauges 220 are provided,
at least one of which is disposed between the first air passage valve 180 and the buffer gas cylinder 170, and at least another of which is disposed between the second air passage valve 190 and the third air passage valve 200;
the pressure value in the pipeline can be effectively measured by setting the barometer 220, specifically, first, the first air path valve 180 is opened and the second air path valve 190 and the third air path valve 200 are closed, so that the high pressure gas source in the high pressure gas bomb 160 enters into the high pressure gas source with a volume v1Until the value of the gas pressure gauge 220 between the first gas circuit valve 180 and the buffer gas cylinder 170 reaches the gas pressure p1(ii) a Then the first air passage valve 180 is closed; opening the second air path valve 190 until the air pressure gauge 220 between the second air path valve 190 and the third air path valve 200 is equal to and stable with the air pressure gauge 220 between the first air path valve 180 and the buffer gas cylinder 170, closing the second air path valve 190, reading the value p of the air pressure gauge 220, and determining that the value p is the value p2(ii) a Finally, the third gas circuit valve 200 is opened, the gas between the third gas circuit valve 200 and the second gas circuit valve 190 slowly flows through the tested sample 130 via the gas inlet pipeline 112, and is finally discharged into the air via the gas outlet pipeline 121, the data change of the gas pressure meter 220 between the second gas circuit valve 190 and the third gas circuit valve 200 is recorded in the whole process, and the average value p of the data in the period is calculatedmeanAnd a gas pressure change amount Δ p.
The installation method of the hypotonic medium gas permeability testing device 100 according to the second aspect of the invention comprises the following steps:
s10: placing the cylinder 110 on a horizontal plane, placing the sample 130 to be tested on a base 141, and providing a pressing block 142 at the upper end of the sample 130 to be tested;
s20: covering a rubber sleeve 1431 on the outer side of the sample under test 130, wherein the upper end and the lower end of the rubber sleeve 1431 extend to the pressing block 142 and the base 141 respectively, and using at least two binding hoops 1432 to be fastened on the outer sides of the rubber sleeve 1431 on the base 141 and the pressing block 142 respectively;
s30: covering the cover body 120 on the open end of the cylinder body 110, and sealing and connecting the cover body 120 and the cylinder body 110 by using a fastener; the gas outlet pipeline 121 is adjustably arranged on the cover body 120, the gas outlet pipeline 121 integrally connected with the pressing block 142 is adjusted to enable the pressing block 142 to be connected to the upper end of the sample 130 to be tested before the cover body 120 is covered on the open end of the cylinder body 110, and the part of the gas outlet pipeline 121 connected with the cover body 120 is adjusted and sealed after the cover body 120 is covered on the open end of the cylinder body 110; for example, an adjusting sealing element 240 is arranged on the cover body 120, the air outlet pipeline 121 penetrates through the adjusting sealing element 240, and when the length of the air outlet pipeline 121 needs to be adjusted, the adjusting sealing element 240 is rotated to release the air outlet pipeline 121; when it is necessary to fix the length of the outlet pipe 121, the adjusting seal member 240 is rotated to fix the outlet pipe 121 and seal the connecting portion of the outlet pipe 121 and the cover 120.
Of course, the present invention is not limited thereto, the cover 120 is covered on the open end of the rod body, and the cover 120 is hermetically connected to the cylinder body 110 by a fastening member; the gas outlet pipeline 121 comprises a cover body 120 part and a pressing block 142 part, and the cover body 120 part and the pressing block 142 part are hermetically connected before the cover body 120 is covered on the open end of the cylinder body 110;
s40: the buffer gas cylinder 170 and the high-pressure gas cylinder 160 are sequentially connected from the outer end side of the air inlet pipeline 112, wherein a first air path valve 180 is arranged between the high-pressure gas cylinder 160 and the buffer gas cylinder 170, a second air path valve 190 and a third air path valve 200 are arranged between the buffer gas cylinder 170 and the outer end side of the air inlet pipeline 112, the second air path valve 190 is arranged close to the buffer gas cylinder 170, and the third air path valve 200 is arranged close to the outer end side of the air inlet pipeline 112.
The test device 100 can be effectively assembled by the installation method of the test device 100, and the installation method can effectively avoid the problems of inaccurate measurement result, polluted test sample, dirty operation environment and the like caused by liquid leakage.
The testing method of the hypotonic medium gas permeability testing device 100 according to the third aspect of the invention comprises the following steps:
s110: opening the air pressure balance bolt 123 to enable the accommodating cavity 111 to be communicated with the outside through the air pressure balance hole 122, simultaneously opening the pressure controllable oil pump 150 to inject hydraulic oil into the accommodating cavity 111 until the hydraulic oil flows out of the air pressure balance hole 122, closing the air pressure balance bolt 123, and adjusting and controlling the pressure controllable oil pump 150 to increase the oil pressure in the accommodating cavity 111 to a preset measurement and calculation confining pressure pc；
S120: the first air path valve 180 is opened to close the second air path valve 190 and the third air path valve 200, so that the high-pressure gas source in the high-pressure gas storage cylinder 160 has an inlet volume v1Until the value of the gas pressure gauge 220 between the first gas circuit valve 180 and the buffer gas cylinder 170 reaches the gas pressure p1Closing the first air passage valve 180;
s130: opening the second air path valve 190 until the air pressure gauge 220 between the second air path valve 190 and the third air path valve 200 is equal to and stable with the air pressure gauge 220 between the first air path valve 180 and the buffer gas cylinder 170, closing the second air path valve 190, reading the value p of the air pressure gauge 220, and determining that the value p is the value p2(ii) a Thereby obtaining the gas volume v between the third gas path valve 200 and the second gas path valve 1902：
S140: the third gas path valve 200 is opened, and the gas between the third gas path valve 200 and the second gas path valve 190 flows through the gas inlet pipeline 112 slowly flowing through the tested sample 130, finally discharging to the air through the gas outlet pipeline 121, recording the data change of the barometer 220 between the second gas circuit valve 190 and the third gas circuit valve 200 in the whole process, and calculating the data mean value p in the periodmean-aAnd the amount of change in gas pressure Δ paThe time consumed for opening the third gas circuit valve 200 is delta t; gas permeability k based on inlet end pressure1The formula is as follows:
wherein mu is the viscosity coefficient of the test gas, h and A are the height and cross-sectional area of the sample, and p0Is at atmospheric pressure;
specifically, the gas slowly flows through the sample under test 130 via the inlet line 112, and is finally discharged to the air via the outlet line 121; recording the data changes of the barometer 220 between the second gas circuit valve 190 and the third gas circuit valve 200 and the barometer 220 on the gas outlet pipeline 121 in the whole process, and recording the data mean value p of the barometer 220 between the second gas circuit valve 190 and the third gas circuit valve 200 in the periodmean-aThe air pressure variation delta p of the air pressure gauge 220 between the second air path valve 190 and the third air path valve 200a(ii) a According to Darcy's law, the average flow Q passing in this periodmeanComprises the following steps:
in the formula: k is the effective gas permeability, A is the cross-sectional area of the sample, and mu is the gas viscosity coefficient
According to the gas mass conservation equation:
ΔPV0＝pmean-aQmeanΔt
research has shown that the distribution of gas in porous media obeys the following law:
wherein p (0, t) ═ pmean-a,p(h,t)＝p0H is the height of the sample, p0At atmospheric pressure
Derivation of the above equation yields:
when the gas permeability at the inlet end of the sample is measured, x is 0, and the formula is arranged to obtain
The gas permeability equation based on the inlet end pressure is then:
s150: the air pressure balance bolt 123 is opened, the pressure-controllable oil pump 150 is used to pump the hydraulic oil in the cylinder, and after the pumping is completed, the testing device 100 is disassembled and the sample under test 130 is taken down.
The permeability of the sample 130 to be tested of the hypotonic medium can be effectively and accurately tested by the testing method, and the testing method is high in accuracy and reliability.
According to the testing method of the hypotonic medium gas permeability testing device of the third aspect of the present invention, as shown in fig. 3, the testing device 100 includes a substitute sample, the substitute sample is a compact material and has a through hole penetrating through the extension direction of the substitute sample, two ends of the through hole are respectively communicated with the gas inlet pipeline 112 and the gas outlet pipeline 121, so as to ensure that the gas cannot flow through the solid part, and the gas can only flow through the hole, wherein a gas pressure gauge 220 and a fourth gas path valve 250 are sequentially installed on the gas outlet pipeline 121 at the upper end of the cover body 110 from bottom to top; wherein the volume of the through hole is v4(ii) a For example, the substitute sample is an iron block.
For example, a sample having the same height and diameter but remaining in the middle is preparedIron blocks with through holes of similar diameter to the pipes (through hole volume v)4) And the central axis of the through hole passes through the centers of the cross sections of the air inlet pipeline 112 and the air outlet pipeline 121. The sample is inserted into a sample coating rubber sleeve 1431 and then is fastened with the base 141 by a binding band 1432; then the pressing block 142 and the rubber sleeve 1431 are connected together through a binding band 1432;
the test method comprises the following steps:
s210: opening the air pressure balance bolt 123 to enable the accommodating cavity 111 to be communicated with the outside through the air pressure balance hole 122, simultaneously opening the pressure controllable oil pump 150 to inject hydraulic oil into the accommodating cavity 111 until the hydraulic oil flows out of the air pressure balance hole 122, closing the air pressure balance bolt 123, and adjusting and controlling the pressure controllable oil pump 150 to increase the oil pressure in the accommodating cavity 111 to a preset measurement and calculation confining pressure pc；
S220: the first air path valve 180 is opened to close the second air path valve 190 and the third air path valve 200, so that the high-pressure gas source in the high-pressure gas storage cylinder 160 has an inlet volume v1Until the value of the gas pressure gauge 220 between the first gas circuit valve 180 and the buffer gas cylinder 170 reaches the gas pressure p1Closing the first air passage valve 180;
s230: opening the second air path valve 190 until the air pressure gauge 220 between the second air path valve 190 and the third air path valve 200 is equal to and stable with the air pressure gauge 220 between the first air path valve 180 and the buffer gas cylinder 170, closing the second air path valve 190, reading the value p of the air pressure gauge 220, and determining that the value p is the value p2(ii) a Thereby obtaining the gas volume v between the third gas path valve 200 and the second gas path valve 1902：
Then, the third air passage valve 200 is opened, and the value p is read after the indication of the air pressure gauge 220 between the second air passage valve 190 and the third air passage valve 200 is stabilized3The volume v of the gas path between the second gas path valve 190 and the lower end of the substitute sample3Comprises the following steps:
s240: the first air path valve 180 is opened to close the second air path valve 190, the third air path valve 200 and the fourth air path valve 250, so that the high-pressure gas source in the high-pressure gas cylinder 160 has an inlet volume v1Until the value of the gas pressure gauge 220 between the first gas circuit valve 180 and the buffer gas cylinder 170 reaches the gas pressure p1Closing the first air passage valve 180; then the second gas path valve 190 and the third gas path valve 200 are opened, the high-pressure gas source is diffused to the fourth gas path valve 250 on the cylinder cover, and the value of the fourth gas path valve is read as p after the value of the barometer 220 is stable5(ii) a The volume v of the gas outlet line 121 (from the upper end surface of the substitute sample to the fourth gas path valve 250 above the cover 110) is increased5Comprises the following steps:
s250: disassembling the test apparatus 100, taking out the substitute sample, and mounting the sample 130 to be tested in the test apparatus 100 according to the mounting method of the test apparatus 100 as claimed in claim 9;
that is, the sample 130 to be tested is inserted into the middle of the rubber sleeve 1431 and then fastened with the base 141 by the binding band 1432; then the pressing block 142 and the rubber sleeve 1431 are connected together through a binding band 1432; then, the annular deformer 210 is tightly wound around the periphery of the middle part of the rubber sleeve 1431 along the annular direction, the wire harness is inserted into the interface reserved on the cylinder body 110, and after the debugging is completed, the filling operation is finished.
S260: the first air path valve 180 and the fourth air path valve 250 are opened, and the second air path valve 190 and the third air path valve 200 are closed, so that the high-pressure gas source in the high-pressure gas storage cylinder 160 has an inlet volume v1After the barometer 220 is stabilized, the first air circuit valve 180 is closed in the buffer air bottle 170; then, the second gas circuit valve 190 is opened, and the second gas circuit valve 190 is closed after the reading of the gas pressure meter 220 is stable; however, the device is not suitable for use in a kitchenThe third gas path valve 200 is opened later, and the gas pressure meter 220 value is read to be p after a few seconds6As the initial pressure at the inlet end, the gas slowly flows through the sample 130 via the inlet pipe 112, and finally is discharged to the air via the outlet pipe 121, the data change of the barometer 220 on the outlet pipe 121 is recorded all the way, and the mean value p of the data during the period is calculatedmean-bAnd the amount of change in gas pressure Δ pbThe time consumed for opening the third gas circuit valve 200 is delta t; the gas permeability equation based on the outlet end pressure is then:
wherein mu is the viscosity coefficient of the test gas, h and A are the height and cross-sectional area of the sample, and p0Is at atmospheric pressure;
the gas slowly flows through the tested sample 130 via the gas inlet pipeline 112, and is finally discharged to the air via the gas outlet pipeline 121; recording the data changes of the barometer 220 between the second gas circuit valve 190 and the third gas circuit valve 200 and the barometer 220 on the gas outlet pipeline 121 in the whole process, and recording the data mean value p of the barometer 220 between the second gas circuit valve 190 and the third gas circuit valve 200 in the periodmean-aThe air pressure variation delta p of the air pressure gauge 220 between the second air path valve 190 and the third air path valve 200a(ii) a Data mean value p of barometer 220 on gas outlet pipeline 121mean-bPressure variation amount Δ pbDuring which time Δ t is consumed.
That is, when the height and cross-sectional area of the sample are known, the effective permeability of the sample can be obtained by recording the inlet end pressure change Δ P within Δ t. The gas permeability based on the outlet end pressure is calculated as follows, and can be obtained according to the gas state equation:
ΔpbV5＝pmean-bQmeanΔt
when the gas permeability of the outlet end of the sample is measured, x is h, and the formula is finished to obtain:
the gas permeability equation based on outlet end pressure is:
s260: and opening the air pressure balance bolt 123, extracting hydraulic oil in the cylinder by using the pressure controllable oil pump 150, and after the extraction is finished, disassembling the testing device and taking down the sample to be tested 130.
The device can measure and calculate the permeability of a target sample by adopting pressure based on the inlet end and pressure based on the outlet end, and the volume of the gas path at the inlet end and the outlet end only needs to be measured once without measuring every time; the annular deformation condition of the sample can be measured under different confining pressures and air pressures; the permeability of the sample 130 to be tested of the hypotonic medium can be effectively and accurately tested by the testing method, and the testing method is high in accuracy and reliability.
The exemplary embodiment of the hypotonic media gas permeability test device 100 proposed by the present invention has been described in detail above with reference to the preferred embodiments, however, it will be understood by those skilled in the art that many variations and modifications may be made to the specific embodiments described above and many combinations of the various technical features and structures proposed by the present invention may be made without departing from the inventive concept, the scope of which is defined by the appended claims.
Claims (10)
1. A hypotonic media gas permeability testing device, comprising:
the hydraulic cylinder comprises a cylinder body (110) defining an accommodating cavity (111) with one open end, wherein an air inlet pipeline (112) and a hydraulic pipeline (113) which are communicated with the accommodating cavity (111) of the cylinder body (110) are arranged on the cylinder body (110);
the cover body (120) is detachably arranged at the open end of the cylinder body (110) in a covering mode so as to seal the accommodating cavity (111), and an air outlet pipeline (121) and an air pressure balance hole (122) communicated with the accommodating cavity (111) are arranged on the cover body (120); wherein the air pressure balancing hole (122) is sealed by an air pressure balancing bolt (123);
a sample under test (130) fitted between said inlet line (112) and said outlet line (121) inside said housing chamber (111);
a packing member (140) that is packed and sealed outside the sample under test (130) and seals at least the connection portions between the sample under test (130) and the inlet pipe (112) and between the sample under test (130) and the outlet pipe (121);
a pressure-controllable oil pump (150) which is communicated with the outer end side of the hydraulic pipeline (113) and is used for pumping hydraulic oil with adjustable pressure into the accommodating cavity (111);
a high pressure gas cylinder (160) having a source of high pressure gas;
a buffer gas cylinder (170) having one end communicated with the high-pressure gas cylinder (160) and the other end communicated with the outer end side of the gas inlet pipe (112);
the gas cylinder air-conditioning system comprises a first gas circuit valve (180), a second gas circuit valve (190) and a third gas circuit valve (200), wherein the first gas circuit valve (180) is arranged between the high-pressure gas cylinder (160) and the buffer gas cylinder (170), the second gas circuit valve (190) and the third gas circuit valve (200) are arranged between the buffer gas cylinder (170) and the outer end side of the gas inlet pipeline (112), the second gas circuit valve (190) is close to the buffer gas cylinder (170), and the third gas circuit valve (200) is close to the outer end side of the gas inlet pipeline (112).
2. The hypotonic media gas permeability test apparatus of claim 1,
the sheathing assembly (140) comprises:
a base (141) formed at the bottom of the cylinder (110), wherein the sample to be tested (130) is fitted on the base (141), and the air inlet pipeline (112) penetrates through the base (141) and extends to the lower end of the sample to be tested (130);
the pressing block (142) is pressed on the upper end of the sample to be tested (130), and the air outlet pipeline (121) penetrates through the pressing block (142) and extends to the upper end of the sample to be tested (130);
and the sealing sleeve (143) is wrapped and sealed on the outer side of the sample to be tested (130), and the upper end and the lower end of the sealing sleeve respectively extend onto the pressing block (142) and the base (141) so as to seal the connecting part between the sample to be tested (130) and the base (141) and the connecting part between the sample to be tested (130) and the pressing block (142).
3. The hypotonic media gas permeability test apparatus of claim 2,
the sheathing assembly (140) further comprises:
and the filter plates (144), the filter plates (144) are respectively fitted between the pressing block (142) and the sample to be tested (130) and between the base (141) and the sample to be tested (130) for filtering impurity particles.
4. The hypotonic media gas permeability test apparatus of claim 3,
the filter plate (144) is a permeable stone.
5. The hypotonic media gas permeability test apparatus of claim 2,
the sealing sleeve (143) comprises:
the rubber sleeve (1431) is coated on the outer side of the tested sample (130), and the upper end and the lower end of the rubber sleeve respectively extend to the pressing block (142) and the base (141);
at least two binding hoops (1432) which are respectively fastened on the outer sides of the rubber sleeve (1431) on the base (141) and the pressing block (142).
6. The hypotonic media gas permeability test apparatus of any one of claims 1 through 5,
further comprising: a circumferential deformation meter (210),
the sleeve is sleeved on the outer side of the sample to be tested (130) and is used for measuring the annular deformation of the sample to be tested (130).
7. The hypotonic media gas permeability test apparatus of any one of claims 1 through 5,
further comprising: at least two gas pressure gauges (220),
at least one of which is arranged between the first gas circuit valve (180) and the buffer gas cylinder (170), and at least another of which is arranged between the second gas circuit valve (190) and the third gas circuit valve (200).
8. A method of installing a hypotonic media gas permeability test apparatus according to any one of claims 1 through 7, comprising the steps of:
s10: placing the cylinder (110) on a horizontal plane, placing the sample to be tested (130) on the base (141) as defined in claim 2, and placing the pressing block (142) as defined in claim 2 on the upper end of the sample to be tested (130);
s20: covering the rubber sleeve (1431) of claim 5 on the outer side of the sample to be tested (130), wherein the upper end and the lower end of the rubber sleeve respectively extend to the pressing block (142) and the base (141), and using at least two binding hoops (1432) respectively bound on the outer sides of the rubber sleeve (1431) on the base (141) and the pressing block (142);
s30: covering the cover body (120) on the open end of the cylinder body (110), and connecting the cover body (120) and the cylinder body (110) in a sealing way by using a fastening piece; the gas outlet pipeline (121) is adjustably arranged on the cover body (120), before the cover body (120) is arranged at the open end of the cylinder body (110), the gas outlet pipeline (121) integrally connected with the pressing block (142) is adjusted to enable the pressing block (142) to be connected to the upper end of the tested sample (130), and after the cover body (120) is arranged at the open end of the cylinder body (110), the part of the gas outlet pipeline (121) connected with the cover body (120) is adjusted and sealed;
s40: the gas cylinder air-conditioning device is characterized in that a buffer gas cylinder (170) and a high-pressure gas cylinder (160) are sequentially connected to the outer end side of the air inlet pipeline (112), wherein a first gas circuit valve (180) is arranged between the high-pressure gas cylinder (160) and the buffer gas cylinder (170), a second gas circuit valve (190) and a third gas circuit valve (200) are arranged between the buffer gas cylinder (170) and the outer end side of the air inlet pipeline (112), the second gas circuit valve (190) is close to the buffer gas cylinder (170), and the third gas circuit valve (200) is close to the outer end side of the air inlet pipeline (112).
9. A method of testing the hypotonic media gas permeability testing device of any one of claims 1 through 7, comprising the steps of:
s110: opening the air pressure balance bolt (123) to enable the accommodating cavity (111) to be communicated with the outside through the air pressure balance hole (122), meanwhile, opening the pressure-controllable oil pump (150) to inject hydraulic oil into the accommodating cavity (111) until the hydraulic oil flows out from the air pressure balance hole (122), closing the air pressure balance bolt (123), adjusting and controlling the pressure-controllable oil pump (150) to increase the oil pressure in the accommodating cavity (111) to a preset measurement confining pressure pc；
S120: the first air path valve (180) is opened, and the second air path valve (190) and the third air path valve (200) are closed, so that the high-pressure gas source in the high-pressure gas storage bottle (160) enters into the high-pressure gas source with the volume v1Until the value of the gas pressure gauge (220) between the first gas circuit valve (180) and the buffer gas cylinder (170) reaches the gas pressure p1Closing the first air passage valve (180);
s130: opening the second air path valve (190) until the air pressure gauge (220) between the second air path valve (190) and the third air path valve (200) is equal to the air pressure gauge (220) between the first air path valve (180) and the buffer gas cylinder (170) and keeping stable, closing the second air path valve (190), and reading the value p of the air pressure gauge (220) to be p2(ii) a Thereby obtaining the gas volume v between the third gas circuit valve (200) and the second gas circuit valve (190)2：
S140: opening the third air path valve (200), and introducing air between the third air path valve (200) and the second air path valve (190)The pipeline (112) slowly flows through the tested sample (130), finally is discharged into the air through the air outlet pipeline (121), the data change of the air pressure meter (220) between the second air path valve (190) and the third air path valve (200) is recorded in the whole process, and the data mean value p in the period is calculatedmean-aAnd the amount of change in gas pressure Δ paSelf-opening the third gas circuit valve (200) takes time delta t; gas permeability k based on inlet end pressure1The formula is as follows:
wherein mu is the viscosity coefficient of the test gas, h and A are the height and cross-sectional area of the sample, and p0Is at atmospheric pressure;
s150: and (3) opening the air pressure balance bolt (123), extracting hydraulic oil in the cylinder by using the pressure controllable oil pump (150), and after extraction is finished, disassembling the testing device and taking down the tested sample (130).
10. A testing method of the hypotonic medium gas permeability testing device according to any one of claims 1 to 7, wherein the testing device (100) comprises a substitute sample, the substitute sample is a compact material and has a through hole penetrating through the extension direction of the substitute sample, two ends of the through hole are respectively communicated with the gas inlet pipeline (112) and the gas outlet pipeline (121), wherein a gas pressure gauge (220) and a fourth gas path valve (250) are sequentially installed on the gas outlet pipeline (121) at the upper end of the cover body (110) from bottom to top; wherein the volume of the through hole is v4；
The test method comprises the following steps:
s210: opening the air pressure balance bolt (123) to enable the accommodating cavity (111) to be communicated with the outside through the air pressure balance hole (122), meanwhile, opening the pressure-controllable oil pump (150) to inject hydraulic oil into the accommodating cavity (111) until the hydraulic oil flows out from the air pressure balance hole (122), closing the air pressure balance bolt (123), adjusting and controlling the pressure-controllable oil pump (150) to increase the oil pressure in the accommodating cavity (111) to a preset measurement confining pressure pc；
S220：The first air path valve (180) is opened, and the second air path valve (190) and the third air path valve (200) are closed, so that the high-pressure gas source in the high-pressure gas storage bottle (160) enters into the high-pressure gas source with the volume v1Until the value of the gas pressure gauge (220) between the first gas circuit valve (180) and the buffer gas cylinder (170) reaches the gas pressure p1Closing the first air passage valve (180);
s230: opening the second air path valve (190) until the air pressure gauge (220) between the second air path valve (190) and the third air path valve (200) is equal to the air pressure gauge (220) between the first air path valve (180) and the buffer gas cylinder (170) and keeping stable, closing the second air path valve (190), and reading the value p of the air pressure gauge (220) to be p2(ii) a Thereby obtaining the gas volume v between the third gas circuit valve (200) and the second gas circuit valve (190)2：
Then, the third air path valve (200) is opened, and the numerical value of the air pressure meter (220) between the second air path valve (190) and the third air path valve (200) is read as p after the numerical value is stable3The volume v of the gas path between the second gas path valve (190) and the lower end of the substitute sample3Comprises the following steps:
s240: the first air path valve (180) is opened to close the second air path valve (190), the third air path valve (200) and the fourth air path valve (250), so that the high-pressure gas source in the high-pressure gas storage bottle (160) enters into the high-pressure gas source with the volume v1Until the value of the gas pressure gauge (220) between the first gas circuit valve (180) and the buffer gas cylinder (170) reaches the gas pressure p1Closing the first air passage valve (180); then the second gas path valve (190) and the third gas path valve (200) are opened, the fourth gas path valve (250) which is diffused to the cylinder cover by the high-pressure gas source reads the value of the barometer (220) after the value of the barometer is stablep5(ii) a The volume v of the gas outlet pipeline (121) (from the upper end face of the substitute sample to the fourth gas path valve (250) above the cover body (110)) is increased5Comprises the following steps:
s250: disassembling the testing device (100), taking out the substitute sample, and mounting the sample (130) to be tested in the testing device (100) according to the mounting method of the testing device (100) as claimed in claim 9;
s260: the first air path valve (180) and the fourth air path valve (250) are opened to close the second air path valve (190) and the third air path valve (200), so that the high-pressure gas source in the high-pressure gas storage bottle (160) enters into the high-pressure gas source with the volume v1After the barometer (220) is stabilized, the first air path valve (180) is closed in the buffer air bottle (170); then, the second gas circuit valve (190) is opened, and the second gas circuit valve (190) is closed after the reading of the gas pressure meter (220) is stable; then, the third air path valve (200) is opened, and the value of the air pressure meter (220) is read as p6As the initial pressure of the inlet end, gas slowly flows through the tested sample (130) through the air inlet pipeline (112), is discharged into the air through the air outlet pipeline (121), the data change of the air pressure meter (220) of the air outlet pipeline (121) is recorded in the whole process, and the average value p of the data in the period is calculatedmean-bAnd the amount of change in gas pressure Δ pbSelf-opening the third gas circuit valve (200) takes time delta t; the gas permeability equation based on the outlet end pressure is then:
wherein mu is the viscosity coefficient of the test gas, h and A are the height and cross-sectional area of the sample, and p0Is at atmospheric pressure;
s260: and (3) opening the air pressure balance bolt (123), extracting hydraulic oil in the cylinder by using the pressure controllable oil pump (150), and after extraction is finished, disassembling the testing device and taking down the tested sample (130).
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