CN104748903A - Liquid-gas conversion pressure measurement device and pressure measurement device with synchronous electrical measurement and digital display for tests - Google Patents
Liquid-gas conversion pressure measurement device and pressure measurement device with synchronous electrical measurement and digital display for tests Download PDFInfo
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- CN104748903A CN104748903A CN201510148984.2A CN201510148984A CN104748903A CN 104748903 A CN104748903 A CN 104748903A CN 201510148984 A CN201510148984 A CN 201510148984A CN 104748903 A CN104748903 A CN 104748903A
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Abstract
The invention discloses a liquid-gas conversion pressure measurement device and a pressure measurement device with the synchronous electrical measurement and digital display for tests. The liquid-gas conversion pressure measurement device comprises a pressure measurement tube, with a communication positioning tube, and a pressure difference sensor. One end of the communication positioning tube is located in the pressure measurement tube, the end tangent plane is a horizontal one, and the other end is located outside the pressure measurement tube; the pressure difference sensor is connected to the pressure measurement tube and is used for detecting the difference of the pressure of the compressed air in the pressure measurement tube and the outside air pressure. The pressure measurement device with the synchronous electrical measurement and digital display for tests comprises the liquid-gas conversion pressure measurement device, a pressure measurement tube and a ruler which is arranged on the surrounding of the pressure measurement tube and which is used for calibrating the level in the pressure measurement tube. A traditional pressure measurement tube used for measuring the water head pressure in basic tests of hydrodynamics and hydraulics can be widely replaced with the pressure measurement device, the basic principle of the hydrodynamics is utilized ingeniously, the traditional measurement manner and the novel measurement manner are combined well, and the fine teaching effect is achieved.
Description
Technical field
The present invention relates to experimental measurement field, be specifically related to the pressure tester of a kind of liquid gas shift pressure tester and experiment band simultaneous electrical measurement digital display.
Background technology
Hydraulics and fluid mechanics are main specialized core courses of the many specialties of engineering and polytechnic universities.Modern hydraulics is based upon experiment, theory, calculates on three large pillars, and therefore, experiment is content indispensable in teaching link.Wherein, piezometric tube is one of pressure measuring instrument the most conventional in hydraulics and hydrodynamic calculations process, it is the simplest a kind of Liquid Column Manometer, with the transparent straight glass tube of a diameter 8-10mm, lower end and the gauge point of pipe are tightly connected by flexible pipe, the upper end open of pipe communicates with air, according to the height that fluid column in piezometric tube rises, just can obtain the pressure of this point.In education experiment, liquid is generally water, i.e. piezometric head, and it is total potential energy of the unit weight water gaging represented to the height of reference field with piezometric surface.Therefore, piezometric tube is arranged on rack of measuring pressure usually, and piezometric head height can be used in piezometric tube subscript scale mark, rack of measuring pressure is laid coordinate paper or on rack of measuring pressure, fixes rule form, by human eye hand dipping water colunm height.Further, this kind of experimental teaching piezometric tube height generally all measures low pressure head within 100cm is main.
Along with the development of modern measurement technology, fluid mechanics class experiment teaching instrument is also introduced and is applied much.Such as to needing the place of using piezometric tube pressure measurement, all direct pressure transducer of domestic and international this kind of experiment teaching instrument replaces cooperation pressure unit and gauge outfit is measured.But as teaching experiment instrument, we think all the time, the use of the most conventional pressure measuring instrument of this quasi-tradition of picture piezometric tube, should the ABC of learning and mastering in student experimenting teaching, indispensable, but also should learn modern measurement technology, and available modern measuring instrument more accurately goes the error of calibrating the survey of human eye hand simultaneously, thus in contrast, improve traditional basic experiment manipulative ability.
Therefore the piezometric tube being equipped with modern measurement technology should be such, it to the traditional piezometric tube human eye hand dipping head height of certain pressure tap of experiment, synchronously can coordinate pressure inverting gauge outfit real-time digital manometric pipe head value by the pressure transducer be connected again.The piezometric tube market of the synchronous digital display of this band but can not find, also do not have what design proposal, the Railway Project wherein related to may more difficult fine solution:
(1) piezometric tube vertically stands on experiment table by shelf is fixing, the graduated scale of piezometric tube is like this too, its zero point of scale is unsettled in certain position height near experiment table top, and every platform also can with installation site height, relative experimental table top has upper lower deviation, and the pressure reduction how allowing the unsettled elevation zero of piezometric tube scale (piezometric head benchmark zero-bit elevation) and differential pressure pickup measure such as to keep be an individual difficult point zero point accurately at the zero-bit.
(2) if measuring pressure of sensor end is directly connected with water body pressure tap, because the pressure of sensor is transmitted by water body, sensor side interface end is sealing, inside there is sealed cavity, be difficult to thorough evacuation of air, residual micro-bubble, pressure water post in communicating pipe can not act directly on the pressure chip of sensor, again because the pressure communication channel in sensor is very tiny, thus very large surface tension can be produced on liquid gas interface, its value can reach 1-5 centimeter water column, even larger, to the experiment piezometric tube low pressure head in usual 100cm, pressure measurement errors can reach more than 10%.
Summary of the invention
The invention provides the pressure tester of a kind of liquid gas shift pressure tester and experiment band simultaneous electrical measurement digital display, extensively can measure traditional piezometric tube of head pressure in substitution fluid mechanics hydraulics basic experiment, apply principles of fluid mechanics cleverly, well unify traditional measurement means and modern measurement technology, have splendid teaching efficiency concurrently.
A kind of liquid gas shift pressure tester, comprising:
With the pressure measurement cylinder being communicated with positioning pipe, described connection positioning pipe inserts from the top of described pressure measurement cylinder, and one end of described connection positioning pipe is positioned at described pressure measurement cylinder and this end grain is surface level, and the other end is positioned at outside described pressure measurement cylinder;
Be connected with described pressure measurement cylinder, for detecting the differential pressure pickup of described pressure measurement cylinder compressed air and outside air pressure reduction;
A measurement interface in described differential pressure pickup leads to air, and another measurement interface in described differential pressure pickup is tightly connected by conduit and described pressure measurement cylinder;
Described conduit inserts one end of described pressure measurement cylinder between the bottom surface of described connection positioning pipe and the end face of described pressure measurement cylinder, and higher than the bottom surface of described connection positioning pipe.
Liquid gas shift pressure tester of the present invention, when needing to measure the zero elevation acting head based on water tank setting, pressure measurement cylinder can at right angle setting, be bonded and fixed on the inner or outer tank wall of water tank to be measured.
When coordinating piezometric tube to measure measuring point head pressure, pressure measurement cylinder lies in a horizontal plane on the good desktop of leveling together with piezometric tube.Pressure measurement cylinder apical side height is about about 1cm higher than zero elevation surface level.UNICOM's positioning pipe inserts the pressure measurement cylinder end face degree of depth and is about 1cm, its bottom notches level, and behind fixed position, keeps the zero elevation surface level isoplanar with setting, uses as zero elevation location.
The bottom of described pressure measurement cylinder is provided with water inlet.Pressure measurement cylinder lower sidewall has water inlet close to bottom surface, and salable external water service hose is connected on the pressure taps such as experimental channel to be measured, water tank.Pressure tap is all water flowing, and after connecting pressure measurement cylinder, it is inner that water enters pressure measurement cylinder from bottom sidewall water inlet, and after water level arrives top UNICOM positioning pipe bottom surface surface level, water level no longer rises, and water can enter UNICOM's positioning pipe.
Test the pressure tester with band simultaneous electrical measurement digital display, comprising:
With the pressure measurement cylinder being communicated with positioning pipe, described connection positioning pipe inserts from the top of described pressure measurement cylinder, and one end of described connection positioning pipe is positioned at described pressure measurement cylinder, and the other end is positioned at outside described pressure measurement cylinder;
The piezometric tube be connected with described connection positioning pipe one end outside described pressure measurement cylinder;
Be arranged on around described piezometric tube for demarcating the ruler of liquid level in described piezometric tube;
Be connected with described pressure measurement cylinder, for detecting the differential pressure pickup of described pressure measurement cylinder compressed air and outside air pressure reduction.
In the present invention, pressure measurement cylinder lower sidewall has a pressure measurement water inlet pipe mouth close to bottom surface, and salable external water service hose is connected on the pressure taps such as experimental channel to be measured, water tank.Pressure tap is all water flowing, after connecting pressure measurement cylinder, it is inner that water enters pressure measurement cylinder from bottom sidewall water inlet, after water level arrives top UNICOM positioning pipe bottom surface surface level, water level no longer rises, and water can enter UNICOM's positioning pipe, then enters piezometric tube, form piezometric tube water column, the numerical value that scale reads after water colunm height is stablized is the head pressure of pressure tap Relative Zero reference level surface.One section of air column then can be sealed to its top at UNICOM's positioning pipe bottom surface surface level of pressure measurement cylinder, due to the surface level isoplanar of UNICOM's positioning pipe bottom surface surface level and rack of measuring pressure zero point of scale, so this section of seal compression air column pressure is piezometric head pressure and adds atmospheric pressure sum.
In order to measure this section of seal compression air column pressure, (can insert from top at pressure measurement cylinder upper air post height component sealing insertion snorkel, also can insert from upper portion side wall), the highest water surface in cylinder is not encountered in snorkel bottom surface, the salable external hollow vent pressure measurement flexible pipe of pressure measurement cylinder outside about about 1cm stayed by snorkel, pressure measurement flexible pipe other end sealing shroud (is not certainly connected by ventilation pressure measurement flexible pipe on differential pressure pickup measurement interface of piezometric tube electrical measurement digital display instrument, directly the measurement interface seal of tube of differential pressure pickup is inserted in pressure measurement cylinder upper air post, the gas column pressure measuring pressure measurement cylinder top compression also can), another measurement interface of differential pressure pickup is logical air directly, pressure difference signal finally sends into the pressure values that pressure unit digital display meter head demonstrates measuring point relative atmospheric pressure, actually be piezometric head pressure, namely value read by piezometric tube water column scale.
Certainly, above-mentioned such pressure measurement barrel structure can along with the compression of sealing air post, actual pressure measurement cylinder water level inside a little more than UNICOM's positioning pipe bottom surface with reference to zero elevation, can suppose that its difference is Δ h, at this we can computational analysis once its error have much impacts to this measurement mechanism.Piezometric head height for desktop type fluid mechanics hydraulic experiment is all the low pressure head of below 1m, if when reaching 1m piezometric head, can produce maximum absolute error, supposes that the uncompressed front volume of sealing air post is V
1, after compression, volume is V
2, be calculated as follows:
According to gas equation, PV/T=nR, gas P pressure (air is exactly atmospheric pressure), V is volume of air, T is the Kelvin temperature (273.15+ degree Celsius) of air, and n is the amount (molal quantity) of gaseous substance, and R is gas law constant.
For sealing air post in pressure measurement cylinder, it is constant that T, n, R are fixed value;
Known, initial uncompressed front P
1=1 atmospheric pressure=1000cm water column, sealing air post height h=1cm;
P after compression
2=1000cm water column+100cm water column=1100cm water column;
P
1×V
1＝P
2×V
2；
P
1×h＝P
2×(h-Δh)；
Calculate absolute error: Δ h=h-P
1× h/P
2=0.091cm;
Relative error=Δ h/ piezometric tube water colunm height=0.091/100=0.091%;
When piezometric tube water column is 1cm, P
2=1001cm water column,
Absolute error: Δ h=0.000999cm, relative error is: 0.0999%
From upper calculating, the error that this air compressing brings is far smaller than design error 1 class precision of system, and within the scope of 0 ~ 100cm water column low pressure measurement, absolute error is maximum is also less than 0.91mm, can ignore completely.According to above-mentioned calculating, when also can obtain the design of pressure measurement cylinder, UNICOM's positioning pipe bottom surface that top is inserted and pressure measurement cylinder end face are apart from highly less, and error is less, leaves 1cm distance error and is less than per mille, enough.
If consider pressurized air error in the ventilation piezometric tube connected again, be calculated as follows: general ventilation piezometric tube length <100cm, internal diameter is about 2mm, consider length 100cm, maximum error during piezometric tube maximum head 100cm water column, if the volume compressing reduction in ventilation piezometric tube is Δ V, then according to gas equation above
ΔV＝V
1-V
2＝V
1-(P
1/P
2×V
1)；
＝3.14×0.1
2×100-1000/1100×3.14×0.1
2×100；
＝0.29cm
3；
For the right cylinder pressure measurement cylinder of 4cm diameter, aforementioned Δ h error can be allowed to increase 0.02cm, global error also just 0.111%.
To sum up, in above-mentioned design pressure measurement barrel structure, piezometric head pressure values measuring error most great talent's per mille rank, the relatively nominal of this teaching and experiment equipment 1 class precision that air compressing volume change is brought, can ignore completely.
As preferably, the bottom surface of described connection positioning pipe and the zero graduation same level face of described ruler.By making UNICOM's positioning pipe bottom surface and piezometric tube zero point of scale same level face, automatically can determine that pressure reduction zero point of the relative atmospheric pressure that differential pressure pickup is measured and piezometric tube scale unsettled elevation zero (piezometric head benchmark zero-bit elevation) such as to keep at the zero-bit.
As preferably, the top of described piezometric tube is provided with for open to atmosphere opening, and the bottom of described piezometric tube is communicated with the described positioning pipe that is communicated with by flexible pipe.
As preferably, the bottom of described pressure measurement cylinder is provided with water inlet.
As preferably, the pressure tester of described experiment band simultaneous electrical measurement digital display, also comprise: fixed support, described piezometric tube and ruler are installed on described fixed support.
Further preferably, described ruler is provided with elongated hole, this ruler to be coordinated with this elongated hole by screw and is fixed on described fixed support, when this screw is in and unscrews state, can slide in elongated hole, thus the adjustment position of ruler on fixed support, thus the zero graduation of convenient adjustment ruler and the same level face, bottom surface being communicated with positioning pipe.
As preferably, the measurement interface in described differential pressure pickup leads to air, and another measurement interface in described differential pressure pickup is tightly connected by conduit and described pressure measurement cylinder.
Further preferably, described conduit inserts one end of described pressure measurement cylinder between the bottom surface of described connection positioning pipe and the end face of described pressure measurement cylinder, and higher than the bottom surface of described connection positioning pipe.
As preferably, the pressure tester of described experiment band simultaneous electrical measurement digital display, also comprises: the pressure unit digital display meter head be connected with described differential pressure pickup.
Compared with prior art, tool of the present invention has the following advantages:
Relatively traditional piezometric tube, the present invention coordinates the modern measuring instruments such as differential pressure pickup, for traditional piezometric head pressure measurement is configured with the real-time digital display measuring system of high-precise synchronization by the pressure measurement cylinder with UNICOM's positioning pipe structure cleverly.It can be integrated in various fluid mechanics hydraulic experiment instruments used for education, student can be allowed to contrast the traditional pressure testing method of study and modern measurement technology, also allowing student learn Hydrodynamics Theory knowledge further and coordinate the innovation and application of modern measurement technology in experimental provision, is really to impart knowledge to students helpful measurement mechanism to student experimenting.
By the liquid gas voltage stabilizing switch technology of pressure measurement cylinder, for the measurement of low pressure head within 1m conventional on experiment table, avoid the pressure error of almost 10% rank that the liquid sticky power that causes owing to there are very difficult emptying minute bubbles when liquid directly contacts with the airtight connecting pipe of pressure transducer is brought.Substantially increase the fluid pressure accuracy of detection of Common fluids pressure transducer under low pressure head pressure under 1m head.Also avoid the corrosion to sensor that liquid and sensor Long contact time are easily brought simultaneously, improve sensor serviceable life and the long-time precision used.
Innovation and application fluid mechanics principle, devise the UNICOM's positioning pipe in pressure measurement cylinder, both pressure tap pressure can be passed through sealing waterway pressure transmission in traditional piezometric tube, form piezometric tube water column, again by sealing gas circuit pressure transmission to differential pressure pickup, direct electrical measurement is facilitated to obtain the relative atmospheric pressure pressure of Relative Zero elevation.And, by making UNICOM's positioning pipe bottom surface and the piezometric tube zero point of scale same level face at pressure measurement cylinder top, automatically can determine that pressure reduction zero point of the relative atmospheric pressure that differential pressure pickup is measured and piezometric tube scale unsettled elevation zero (piezometric head benchmark zero-bit elevation) such as to protect at the zero-bit, when solving traditional piezometric tube configuration digital display pressure gauge, be difficult to the difficult problem at unified benchmark zero point.
For ensureing UNICOM's positioning pipe bottom surface and the piezometric tube zero point of scale same level face at pressure measurement cylinder top, avoid the deviation that fixing processing easily brings, devise the rack of measuring pressure scale can finely tuning distance in the vertical direction up and down especially, by actual measurement adjustment, this error can be eliminated very easily.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention tests the pressure tester with band simultaneous electrical measurement digital display.
Embodiment
As shown in Figure 1, for the present invention tests the pressure tester with band simultaneous electrical measurement digital display, comprise: with the pressure measurement cylinder 9 being communicated with positioning pipe 8, the bottom of pressure measurement cylinder 9 is provided with water inlet 10, be communicated with positioning pipe 8 to insert from the top of pressure measurement cylinder 9, vertical direction, the one end being communicated with positioning pipe 8 is positioned at pressure measurement cylinder 9, and the other end is positioned at outside pressure measurement cylinder 9; The piezometric tube 2 be connected with connection positioning pipe 8 one end outside pressure measurement cylinder 9; Be arranged on around piezometric tube 2 for demarcating the ruler 3 (the transparent ruler of concrete employing, conveniently accurately reads data) of liquid level in piezometric tube 2; Be connected with pressure measurement cylinder 9, for detecting the differential pressure pickup 15 of pressure measurement cylinder 9 compressed air and outside air pressure reduction.
Be communicated with the bottom surface of positioning pipe 8 and the zero graduation same level face of ruler 3.By making UNICOM's positioning pipe 8 bottom surface and piezometric tube scale (i.e. ruler 3) same level at zero point face, automatically can determine that pressure reduction zero point of the relative atmospheric pressure that differential pressure pickup 15 is measured and piezometric tube scale (i.e. ruler 3) unsettled elevation zero (piezometric head benchmark zero-bit elevation) such as to keep at the zero-bit.
The experiment pressure tester of band simultaneous electrical measurement digital display, also comprise: fixed support 1, piezometric tube 2 and ruler 3 are installed on fixed support 1.Ruler 3 is provided with elongated hole 5, this ruler 3 to be coordinated with this elongated hole 5 by screw 6 and is fixed on fixed support 1, when this screw 6 is in and unscrews state, can slide in elongated hole 5, thus the adjustment position of ruler 3 on fixed support 1, thus the zero graduation of convenient adjustment ruler 3 and the same level face, bottom surface being communicated with positioning pipe 8.
A measurement interface 14 in differential pressure pickup 15 leads to air, and another measurement interface 13 in differential pressure pickup 15 is tightly connected by conduit (snorkel 11 and pressure measurement flexible pipe 12) and pressure measurement cylinder 9.Conduit inserts one end of pressure measurement cylinder 9 between the bottom surface being communicated with positioning pipe 8 and the end face of pressure measurement cylinder 9, and higher than being communicated with the bottom surface of positioning pipe 8.
The experiment pressure tester of band simultaneous electrical measurement digital display, also comprises: the pressure unit digital display meter head 17 be connected with differential pressure pickup 15.
The present invention tests the pressure tester with band simultaneous electrical measurement digital display, there is a piezometric tube 2 (i.e. traditional piezometric tube) be vertically arranged on fixed support 1, air is led in piezometric tube 2 open top, water inlet 4 is arranged at bottom, piezometric tube 2 can vertically be placed on the desktop 18 of the level of mixing up under fixed support 1 supports, on the cross bar that fixed support 1 top is protruded, on the right side of piezometric tube 2 front vertical axis, fixed vertical hangs a transparent ruler 3, for measuring water colunm height in piezometric tube 2, ruler 3 top has vertical direction and moves pickup groove (i.e. elongated hole 5), frame upper is fixed on by screw 6, and by the vertical fixed position up and down to shifting chute fine setting ruler 3, the elevation surface level 20 at zero point of adjustment ruler 3 keeps the same level face, UNICOM's positioning pipe 8 bottom surface of inserting with pressure measurement cylinder 9 top, screw 6 is fastening to be adjusted rear available glue and is adhesively fixed extremely, prevent ruler 3 slippage.
Fixed support 1 is placed on one and mixes up on the experiment desktop 18 of level, and table top limit is provided with the liquid gas shift pressure measurement cylinder 9 (i.e. pressure measurement cylinder 9) of the band zero-bit elevation location of a clear perspex material, and inner retaining is clearly visible, facilitates Germicidal efficacy.Pressure measurement cylinder 9 height is about about 1cm higher than the surface level at rack of measuring pressure ruler 3 zero point.Pressure measurement cylinder 9 bottom surface is with top surface being parallel and seal vertical bonding with barrel, and end face has 1 aperture, seal bonding be vertically inserted with one with piezometric tube 2 bottom water inlet 4 with UNICOM's positioning pipe 8 of external diameter.UNICOM's positioning pipe 8 exceeds end face and is about 1cm, is convenient to seal external PVC water service hose 7, and seals with water inlet bottom piezometric tube 24 and be communicated with, and forms the sealing ventilating water pipe of piezometric tube 2 water column.UNICOM's positioning pipe 8 inserts the pressure measurement cylinder degree of depth and is about 1cm, bottom surface level, and keeps surface level 20 isoplanar with rack of measuring pressure ruler 3 zero point.Pressure measurement cylinder 9 lower sidewall has a pressure measurement water inlet pipe mouth 10 (water inlet 10) close to bottom surface, and salable external water service hose is connected on the pressure taps such as experimental channel to be measured, water tank.Pressure tap is all water flowing, after connecting pressure measurement cylinder, it is inner that water can enter pressure measurement cylinder 9 from bottom sidewall water inlet 10, after water level arrives top UNICOM positioning pipe 8 bottom surface surface level 20, water level no longer rises, and water can enter UNICOM's positioning pipe 8, then enters piezometric tube 2, form piezometric tube water column 19, the numerical value that scale reads after water colunm height is stablized is the head pressure of pressure tap Relative Zero reference level surface 20.One section of air column then can be sealed to its top at UNICOM's positioning pipe 8 bottom surface surface level 20 of pressure measurement cylinder 9, due to UNICOM's positioning pipe 8 bottom surface surface level 20 and surface level 20 isoplanar of rack of measuring pressure zero point of scale, so this section of seal compression air column pressure is piezometric head pressure and adds atmospheric pressure sum.
In order to measure this section of seal compression air column pressure, the stainless steel snorkel 11 that an aperture seals a bonding insertion internal diameter 2mm can be opened (can insert from top at pressure measurement cylinder 9 top, also can insert from upper portion side wall), the highest water surface in bucket is not encountered in snorkel 11 bottom surface, the salable external hollow vent pressure measurement flexible pipe 12 of pressure measurement cylinder 9 outside about about 1cm stayed by snorkel 11, pressure measurement flexible pipe 12 other end sealing shroud (is not certainly connected by ventilation pressure measurement flexible pipe 12 on fluid pressure difference sensor 15 1 measurement interfaces 13 of piezometric tube electrical measurement digital display instrument 16, directly the measurement interface pipe 13 of differential pressure pickup 15 is sealed and insert in pressure measurement cylinder 9 upper air post, the gas column pressure measuring pressure measurement cylinder 9 top compression also can), another measurement interface 14 of differential pressure pickup 15 is logical air directly, pressure difference signal finally sends into the pressure values that pressure unit digital display meter head 17 demonstrates measuring point relative atmospheric pressure, actually be piezometric head pressure, namely value read by piezometric tube water column scale, in Fig. 1, digital display is the pressure of 44.8cm water column.
During specific experiment, first want the good desktop 18 of level-off, the water inlet 10 of pressure measurement cylinder 9 is passed through water service hose, draw tubule with experimental channel to be measured or water tank pressure tap to be tightly connected, experimental channel or water tank are when testing just beginning and end water inlet, the pipeline that pressure measurement cylinder 9 connects with the measurement interface 13 of differential pressure pickup 15 leads directly to air, isobaric with measurement interface 14, now needs the pressure unit digital display meter head 17 to being connected with differential pressure pickup 15 initially to return to zero.Then start experimental apparatus water pump to supply water, enter experiment, according to each experimental procedure, after piezometric tube 2 water column is stable, while by ruler on rack of measuring pressure 3, piezometric tube water colunm height can be measured with manual human eye traditional approach, can contrast again and use electrical measurement digital displaying meter 16 high-acruracy survey.
Last it is noted that obviously, above-described embodiment is only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (10)
1. a liquid gas shift pressure tester, is characterized in that, comprising:
With the pressure measurement cylinder being communicated with positioning pipe, described connection positioning pipe inserts from the top of described pressure measurement cylinder, and one end of described connection positioning pipe is positioned at described pressure measurement cylinder and this end grain is surface level, and the other end is positioned at outside described pressure measurement cylinder;
Be connected with described pressure measurement cylinder, for detecting the differential pressure pickup of described pressure measurement cylinder compressed air and outside air pressure reduction;
A measurement interface in described differential pressure pickup leads to air, and another measurement interface in described differential pressure pickup is tightly connected by conduit and described pressure measurement cylinder;
Described conduit inserts one end of described pressure measurement cylinder between the bottom surface of described connection positioning pipe and the end face of described pressure measurement cylinder, and higher than the bottom surface of described connection positioning pipe.
2. test the pressure tester with band simultaneous electrical measurement digital display, it is characterized in that, comprising:
With the pressure measurement cylinder being communicated with positioning pipe, described connection positioning pipe inserts from the top of described pressure measurement cylinder, and one end of described connection positioning pipe is positioned at described pressure measurement cylinder, and the other end is positioned at outside described pressure measurement cylinder;
The piezometric tube be connected with described connection positioning pipe one end outside described pressure measurement cylinder;
Be arranged on around described piezometric tube for demarcating the ruler of liquid level in described piezometric tube;
Be connected with described pressure measurement cylinder, for detecting the differential pressure pickup of described pressure measurement cylinder compressed air and outside air pressure reduction.
3. the pressure tester of experiment band simultaneous electrical measurement digital display according to claim 2, it is characterized in that, the top of described piezometric tube is provided with for open to atmosphere opening, and the bottom of described piezometric tube is communicated with the described positioning pipe that is communicated with by flexible pipe.
4. the pressure tester of experiment band simultaneous electrical measurement digital display according to claim 2, it is characterized in that, the bottom of described pressure measurement cylinder is provided with water inlet.
5. the pressure tester of experiment band simultaneous electrical measurement digital display according to claim 2, is characterized in that, the bottom surface of described connection positioning pipe and the zero graduation same level face of described ruler.
6. the pressure tester of experiment band simultaneous electrical measurement digital display according to claim 2, it is characterized in that, also comprise: fixed support, described piezometric tube and ruler are installed on described fixed support.
7. the pressure tester of experiment according to claim 6 band simultaneous electrical measurement digital display, it is characterized in that, described ruler is provided with elongated hole, and this ruler to be coordinated with this elongated hole by screw and is fixed on described fixed support.
8. the pressure tester of experiment band simultaneous electrical measurement digital display according to claim 2, it is characterized in that, a measurement interface in described differential pressure pickup leads to air, and another measurement interface in described differential pressure pickup is tightly connected by conduit and described pressure measurement cylinder.
9. the pressure tester of experiment band simultaneous electrical measurement digital display according to claim 8, it is characterized in that, described conduit inserts one end of described pressure measurement cylinder between the bottom surface of described connection positioning pipe and the end face of described pressure measurement cylinder, and higher than the bottom surface of described connection positioning pipe.
10. the pressure tester of experiment band simultaneous electrical measurement digital display according to claim 2, is characterized in that, also comprise: the pressure unit digital display meter head be connected with described differential pressure pickup.
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| CN105675252A (en) * | 2015-12-29 | 2016-06-15 | 浙江大学 | Pressure measurement device with liquid level control, composite set and method thereof |
| CN111834024A (en) * | 2020-07-23 | 2020-10-27 | 中国核动力研究设计院 | On-line accurate measurement method and system for pressure in containment vessel |
| CN114636511A (en) * | 2022-02-14 | 2022-06-17 | 陈辉 | Vacuum pressure instrument |
| CN114636511B (en) * | 2022-02-14 | 2024-03-01 | 四川川府仪表有限公司 | Vacuum pressure instrument |
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