CN104748903B - 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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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, and in particular to a kind of liquid gas shift pressure tester and experiment band simultaneous electrical measurement
The pressure tester of digital display.
Background technology
Hydraulics and hydrodynamics are a main specialized core courses of many specialties of engineering and polytechnic universities.Modern hydraulics is to build
Stand in experiment, theory, calculate on three big pillars, therefore, experiment is content indispensable in teaching link.Wherein, pressure measurement
Pipe is one of pressure measuring instrument the most commonly used during hydraulics and hydrodynamic calculations, and it is a kind of simplest fluid column
Formula piezometer, with the transparent straight glass tube of a diameter 8-10mm, lower end and the measuring point of pipe are tightly connected by flexible pipe, pipe it is upper
End opening is communicated with air, according to the height that fluid column in pressure-measuring pipe rises, so that it may obtain the pressure of the point.The liquid in education experiment
Usually water, i.e. piezometric head, it is total potential energy of the Unit Weight water represented with the height of piezometric surface to datum level.
Therefore, pressure-measuring pipe is typically mounted on rack of measuring pressure, and piezometric head height can be used in pressure-measuring pipe subscript graduation mark, rack of measuring pressure upper berth
If graph paper fixes rule form on rack of measuring pressure, by human eye hand dipping water-column.Also, this kind of experimental teaching
Measured all within 100cm based on low pressure head with pressure-measuring pipe height is general.
With the development of modern measurement technology, hydrodynamics class experiment teaching instrument is also introduced into applying much.It is such as right
Need to use where pressure-measuring pipe pressure measurement, both at home and abroad this kind of experiment teaching instrument is all directly replaced with pressure transducer and matches somebody with somebody resultant pressure
Transmitter and gauge outfit are measuring.But used as teaching experiment instrument, we think all the time, as pressure-measuring pipe, this quasi-tradition is the most normal
With the use of pressure measuring instrument, be in student experimenting teaching should learning and mastering ABC, it is indispensable, but while
Modern measurement technology should be learnt, and available more modern measuring instrument goes to calibrate the error that human eye handss are surveyed, so as to right
Traditional basic experiment manipulative ability is improved than in.
Therefore the pressure-measuring pipe for being equipped with modern measurement technology should be such, and it can be to testing certain pressure tap with traditional
Pressure-measuring pipe human eye hand dipping head height, synchronously can coordinate pressure inverting gauge outfit to count in real time by connected pressure transducer again
Aobvious piezometric head value.But can not find on this pressure-measuring pipe market with synchronous digital display, also do not have what design, wherein relating to
And Railway Project may more difficult fine solution：
(1) pressure-measuring pipe is to fix vertically to stand in laboratory table by shelf, the graduated scale of pressure-measuring pipe similarly thus, its
Zero point of scale vacantly near experiment table top certain position height, and per platform can also with installation site height, relative experimental
Table top has upper lower deviation, how to allow the hanging elevation zero of pressure-measuring pipe scale (piezometric head benchmark zero-bit elevation) to pass with pressure reduction
Accurately the zero-bit such as holding is a difficult point to the pressure reduction zero point of sensor measurement.
(2) if measuring pressure of sensor end be joined directly together with water body pressure tap it is logical because the pressure of sensor be by water body pass
Send, sensor side interface end is sealing, inside there is sealing cavity, it is difficult to thoroughly evacuation of air, remains micro-bubble, communicating pipe
In pressure water post can not act directly on the pressure chip of sensor, and due to the pressure communication channel in sensor it is very thin
It is little, thus very big surface tension can be produced on liquid gas interface, its value can reach 1-5 centimeter water columns, even more greatly, to logical
Experiment pressure-measuring pipe low pressure head in normal 100cm, pressure measurement errors are up to more than 10%.
The content of the invention
The invention provides a kind of pressure tester of liquid gas shift pressure tester and experiment with simultaneous electrical measurement digital display, can be wide
Traditional pressure-measuring pipe of head pressure is measured in general substitution fluid mechanics hydraulics basic experiment, hydrodynamics base is cleverly applied
Present principles, have unified well traditional measurement means and modern measurement technology, have splendid teaching efficiency concurrently.
A kind of liquid gas shift pressure tester, including：
Pressure measurement cylinder with connection positioning pipe, the connection positioning pipe is inserted from the top of the pressure measurement cylinder, the connection
One end of positioning pipe is located in the pressure measurement cylinder and the end grain is horizontal plane, and the other end is located at outside the pressure measurement cylinder；
It is connected with the pressure measurement cylinder, for detecting the pressure difference sensing of the pressure measurement cylinder compressed air and outside air pressure reduction
Device；
The logical air of a measurement interface in described differential pressure pickup, another measurement interface in described differential pressure pickup
It is tightly connected with the pressure measurement cylinder by conduit；
Described conduit inserts one end of the pressure measurement cylinder and is located at the bottom surface of the connection positioning pipe and the pressure measurement cylinder
Between top surface, and higher than the bottom surface of the connection positioning pipe.
Liquid gas shift pressure tester of the present invention, in the zero elevation acting head for needing measurement based on water tank setting, surveys
Pressure cylinder can right angle setting, be bonded and fixed to inside or outside water tank to be measured on water tank wall.
When pressure-measuring pipe measurement measuring point head pressure is coordinated, pressure measurement cylinder lies in a horizontal plane in the good table of leveling together with pressure-measuring pipe
On face.Pressure measurement cylinder apical side height is higher than zero elevation horizontal plane about 1cm or so.UNICOM's positioning pipe inserts pressure measurement cylinder top surface depth about
1cm, its bottom notches level, and behind fixed position, keep coplanar with the zero elevation horizontal plane of setting, it is fixed as zero elevation
Position uses.
The bottom of described pressure measurement cylinder is provided with water inlet.The close bottom surface of pressure measurement cylinder lower sidewall is provided with water inlet, 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, connects pressure measurement cylinder
Afterwards, water is entered inside pressure measurement cylinder from bottom sidewall water inlet, after water level reaches top UNICOM's positioning pipe bottom surface horizontal plane, water level
No longer rise, water can enter UNICOM's positioning pipe.
A kind of pressure tester of the experiment with simultaneous electrical measurement digital display, including：
Pressure measurement cylinder with connection positioning pipe, the connection positioning pipe is inserted from the top of the pressure measurement cylinder, the connection
One end of positioning pipe is located in the pressure measurement cylinder, and the other end is located at outside the pressure measurement cylinder；
The pressure-measuring pipe being connected with the one end of the connection positioning pipe outside the pressure measurement cylinder；
Being arranged on around the pressure-measuring pipe is used for the ruler for demarcating liquid level in the pressure-measuring pipe；
It is connected with the pressure measurement cylinder, for detecting the pressure difference sensing of the pressure measurement cylinder compressed air and outside air pressure reduction
Device.
In the present invention, the close bottom surface of pressure measurement cylinder lower sidewall is provided with a pressure measurement water inlet pipe mouth, and salable external water flowing is soft
Pipe is connected on the pressure taps such as experimental channel to be measured, water tank.Pressure tap is all water flowing, and after connection pressure measurement cylinder, water is from bottom
Side wall water inlet is entered inside pressure measurement cylinder, and after water level reaches top UNICOM's positioning pipe bottom surface horizontal plane, water level no longer rises, water
UNICOM's positioning pipe can be entered, pressure-measuring pipe is subsequently entered, pressure-measuring pipe water column is formed, the numerical value that scale reads after water-column is stable
The as head pressure of pressure tap Relative Zero reference level surface.And pressure measurement cylinder UNICOM's positioning pipe bottom surface horizontal plane at the top of it
One section of air column can then be sealed, due to UNICOM's positioning pipe bottom surface horizontal plane it is coplanar with the horizontal plane of rack of measuring pressure zero point of scale, institute
So that this section of seal compression air column pressure is piezometric head pressure plus atmospheric pressure sum.
In order to measure this section of seal compression air column pressure, can be in pressure measurement cylinder upper air post height component sealing insertion one
Root breather (can be inserted, also can insert from upper portion side wall) from top, and the highest water surface in cylinder is not encountered in breather bottom surface,
Breather stays in the salable external hollow vent pressure measurement flexible pipes of about 1cm or so outside pressure measurement cylinder, pressure measurement flexible pipe other end sealing shroud
On one measurement interface of differential pressure pickup of pressure-measuring pipe electrical measurement digital display instrument (it is certainly not hose connection by ventilation pressure measurement, directly
By in the measurement interface seal of tube insertion pressure measurement cylinder upper air post of differential pressure pickup, the gas column pressure of pressure measurement cylinder top compression is measured
It is strong also can), differential pressure pickup another measurement interface directly leads to air, and pressure difference signal finally sends into pressure transmitter digital display meter head
The pressure values of the relatively large air pressure of measuring point are shown, it is actual to be piezometric head pressure, i.e. pressure-measuring pipe water column scale readings.
Certainly, above-mentioned such pressure measurement barrel structure can be with the compression of seal gas post, actual pressure measurement cylinder water level inside meeting
Slightly above UNICOM's positioning pipe bottom surface refers to zero elevation, it is assumed that its difference is Δ h, here we can calculate and analyze its error
There are much impacts to this measurement apparatus.For the piezometric head height of desktop type hydrodynamics hydraulic experiment be all 1m with
Under low pressure head, if up to 1m piezometric heads, maximum absolute error can be produced, it is assumed that the uncompressed front volume of seal gas post
For V1, volume is V after compression2, it is calculated as follows：
It can be seen from gas equation, PV/T=nR, gas P pressure (air is exactly atmospheric pressure), V is volume of air, and T is sky
The Kelvin (273.15+ degree Celsius) of gas, n is the amount (molal quantity) of gaseous substance, and R is gas constant.
For pressure measurement cylinder interior sealing air column, T, n, it is constant that R is fixed value；
, it is known that initial uncompressed front P1=1 atmospheric pressure=1000cm water column, seal gas pillar height degree h=1cm；
P after compression2=1000cm water columns+100cm water columns=1100cm water columns；
P1×V1=P2×V2；
P1× h=P2×(h-Δh)；
Calculate absolute error：Δ h=h-P1×h/P2=0.091cm；
Relative error=Δ h/ pressure-measuring pipe water-columns=0.091/100=0.091%；
When pressure-measuring pipe water column is 1cm, P2=1001cm water columns,
Absolute error：Δ h=0.000999cm, relative error is：0.0999%
From upper calculating, the error that this air compression strap is come is far smaller than the class precision of design error 1 of system, 0
In the range of~100cm water column low pressure measurements, absolute error maximum can be ignored completely again smaller than 0.91mm.According to above-mentioned calculating,
When the design of pressure measurement cylinder is also obtained, UNICOM's positioning pipe bottom surface of top insertion is less with pressure measurement cylinder top surface distance height, and error is got over
It is little, leave 1cm range errors and be less than one thousandth, enough.
If considering further that compressed air error in the ventilation pressure-measuring pipe of connection, it is calculated as follows：General ventilation pressure measurement length of tube<
100cm, internal diameter about 2mm, it is considered to length 100cm, maximum error during pressure-measuring pipe maximum head 100cm water columns, if ventilation pressure measurement
The volume that reduction is compressed in pipe is Δ V, then it can be seen from gas equation above,
Δ V=V1-V2=V1-(P1/P2×V1)；
=3.14 × 0.12×100-1000/1100×3.14×0.12×100；
=0.29cm3；
For the cylinder pressure measurement cylinder of 4cm diameters, aforementioned Δ h errors can be allowed to increase 0.02cm, global error is also
0.111%.
To sum up, in above-mentioned design pressure measurement barrel structure, the piezometric head pressure values that the change of air compression volume brings are surveyed
Amount error most great talent's one thousandth rank, it is nominal with respect to the class precision of this teaching and experiment equipment 1 for, can ignore completely.
Preferably, the zero graduation same level face of the described bottom surface and the ruler that connect positioning pipe.By making UNICOM
Positioning pipe bottom surface and pressure-measuring pipe zero point of scale same level face, can automatically determine the pressure reduction of the relatively large air pressure of differential pressure pickup measurement
The zero-bit such as zero point and the hanging elevation zero of pressure-measuring pipe scale (piezometric head benchmark zero-bit elevation) holding.
Preferably, being provided with the top of described pressure-measuring pipe for open to atmosphere opening, the bottom of described pressure-measuring pipe leads to
Cross flexible pipe and connect positioning pipe connection with described.
Preferably, the bottom of described pressure measurement cylinder is provided with water inlet.
Preferably, pressure tester of the described experiment with simultaneous electrical measurement digital display, also includes：Fixed support, it is described
Pressure-measuring pipe and ruler are installed on the fixed support.
Further preferably, described ruler is provided with elongated hole, and the ruler is fixed on by screw with elongated hole cooperation
On the fixed support, the screw can slide in when unscrewing state in elongated hole, so as to adjust ruler on fixed support
Position, the zero graduation and the bottom surface same level face for connecting positioning pipe so as to convenient adjustment ruler.
Preferably, the logical air of a measurement interface in described differential pressure pickup, another in described differential pressure pickup
One measurement interface is tightly connected by conduit with the pressure measurement cylinder.
Further preferably, described conduit inserts bottom surface and the institute that one end of the pressure measurement cylinder is located at the connection positioning pipe
State between the top surface of pressure measurement cylinder, and higher than the bottom surface of the connection positioning pipe.
Preferably, pressure tester of the described experiment with simultaneous electrical measurement digital display, also includes：With the differential pressure pickup
The pressure transmitter digital display meter head of connection.
Compared with prior art, the invention has the advantages that：
Relatively conventional pressure-measuring pipe, the present invention cleverly coordinates pressure difference sensing by positioning the pressure measurement cylinder of tubular construction with UNICOM
The modern times such as device measuring instrument, is that traditional piezometric head pressure measurement is configured with the real-time digital display measuring system of high-precise synchronization.Its energy
In being integrated into various hydrodynamics hydraulic experiment instruments used for education, student's contrast can be allowed to learn traditional pressure testing method with modern amount
Survey technology, also allows student further to learn Hydrodynamics Theory knowledge and coordinates innovation of the modern measurement technology in experimental provision to answer
With being can really to the helpful measurement apparatus of student experimenting teaching.
By the liquid gas voltage stabilizing switch technology of pressure measurement cylinder, for the measurement of low pressure head within routine 1m in laboratory table, keep away
The liquid for having exempted to cause due to there are the minute bubbles for being difficult emptying when liquid is directly contacted with pressure transducer airtight connection pipe glues
The pressure error of almost 10% rank that stagnant power is brought.The Common fluids pressure transducer under 1m heads is substantially increased in low pressure
Fluid pressure accuracy of detection under head pressure.Also avoid that liquid and sensor Long contact time easily bring simultaneously to sensing
The corrosion of device, improves the precision that sensor service life and long-time are used.
Innovation and application fluid mechanics principle, devises the UNICOM's positioning pipe in pressure measurement cylinder, can both pass through pressure tap pressure
Sealing waterway pressure transmission forms pressure-measuring pipe water column in traditional pressure-measuring pipe, and can be by sealing gas circuit pressure transmission to differential pressure pickup, side
Just direct electrical measurement obtains the relatively large air pressure pressure of relative zero elevation.Also, by making the UNICOM's positioning pipe at the top of pressure measurement cylinder
Bottom surface and pressure-measuring pipe zero point of scale same level face, can automatically determine differential pressure pickup measurement relatively large air pressure pressure reduction zero point with
The zero-bits such as the hanging elevation zero of pressure-measuring pipe scale (piezometric head benchmark zero-bit elevation) guarantor, solve traditional pressure-measuring pipe configuration
It is difficult to unify a difficult problem for benchmark zero point during digital manometric table.
To ensure the UNICOM's positioning pipe bottom surface at the top of pressure measurement cylinder and pressure-measuring pipe zero point of scale same level face, it is to avoid fixed processing
The deviation easily brought, be specifically designed can lower fine setting distance in vertical direction rack of measuring pressure scale, by surveying adjustment, can be with
Very easily eliminate this error.
Description of the drawings
Fig. 1 is the structural representation of present invention pressure tester of the experiment with simultaneous electrical measurement digital display.
Specific embodiment
As shown in figure 1, be present invention experiment with the pressure tester with simultaneous electrical measurement digital display, including：With connection positioning pipe 8
Pressure measurement cylinder 9, the bottom of pressure measurement cylinder 9 is provided with water inlet 10, connects positioning pipe 8 and insert from the top of pressure measurement cylinder 9, vertical direction,
One end of connection positioning pipe 8 is located in pressure measurement cylinder 9, and the other end is located at outside pressure measurement cylinder 9；With connect positioning pipe 8 outside pressure measurement cylinder 9
The pressure-measuring pipe 2 of one end connection；Being arranged on around pressure-measuring pipe 2 is used for the ruler 3 for demarcating liquid level in pressure-measuring pipe 2 (specifically using transparent
Ruler, convenient accurately to read data)；It is connected with pressure measurement cylinder 9, for detecting the compressed air of pressure measurement cylinder 9 and outside air pressure reduction
Differential pressure pickup 15.
The bottom surface of connection positioning pipe 8 and the zero graduation same level face of ruler 3.By making the bottom surface of UNICOM's positioning pipe 8 and pressure measurement
Pipe scale (i.e. ruler 3) zero point same level face, can automatically determine the pressure reduction zero point of the relatively large air pressure of the measurement of differential pressure pickup 15
The zero-bits such as elevation zero (the piezometric head benchmark zero-bit elevation) holding hanging with pressure-measuring pipe scale (i.e. ruler 3).
Experiment is also included with the pressure tester with simultaneous electrical measurement digital display：Fixed support 1, pressure-measuring pipe 2 and ruler 3 are respectively mounted
On fixed support 1.Ruler 3 is provided with elongated hole 5, and the ruler 3 is fixed on fixed by screw 6 with the cooperation of elongated hole 5
On frame 1, the screw 6 can slide, so as to adjust position of the ruler 3 on fixed support 1 in when unscrewing state in elongated hole 5
Put, the zero graduation and the bottom surface same level face for connecting positioning pipe 8 so as to convenient adjustment ruler 3.
A measurement interface 14 in differential pressure pickup 15 leads to air, and another measurement interface 13 in differential pressure pickup 15 passes through
Conduit (breather 11 and pressure measurement flexible pipe 12) is tightly connected with pressure measurement cylinder 9.One end of conduit insertion pressure measurement cylinder 9 is located at connection positioning
Between the bottom surface of pipe 8 and the top surface of pressure measurement cylinder 9, and higher than the bottom surface of connection positioning pipe 8.
Experiment is also included with the pressure tester with simultaneous electrical measurement digital display：The pressure transmitter being connected with differential pressure pickup 15
Digital display meter head 17.
Present invention experiment is vertically installed on fixed support 1 with the pressure tester with simultaneous electrical measurement digital display with one
Pressure-measuring pipe 2 (i.e. traditional pressure-measuring pipe), air, bottom are led in the open top of pressure-measuring pipe 2 water inlet 4, and pressure-measuring pipe 2 is in fixed support 1
Lower being vertically disposed in is supported to mix up on horizontal desktop 18, on the cross bar of the top of fixed support 1 protrusion, before pressure-measuring pipe 2
Vertical central axis line right side fixed vertical hang a transparent ruler 3, for measuring pressure-measuring pipe 2 in water-column, the top of ruler 3
Vertical direction movement fixing groove (i.e. elongated hole 5) is provided with, frame upper is fixed on by screw 6, and can be by vertically to movement
Groove finely tunes the fixed position up and down of ruler 3, and the zero point elevation horizontal plane 20 for adjusting ruler 3 keeps and the insertion of the top of pressure measurement cylinder 9
The bottom surface same level face of UNICOM's positioning pipe 8, the fastening of screw 6 can use glue to be adhesively fixed extremely after adjusting, and prevent the sliding of ruler 3.
Fixed support 1 is placed on one and mixes up on horizontal experiment desktop 18, and table top side is provided with a transparent organic glass
The liquid gas shift pressure measurement cylinder 9 (i.e. pressure measurement cylinder 9) with zero-bit elevation location of glass material, internal water-retention is clearly visible, convenient experiment
Observation.The horizontal plane about 1cm or so of the height of pressure measurement cylinder 9 higher than the zero point of rack of measuring pressure ruler 3.The bottom surface of pressure measurement cylinder 9 is parallel with top surface simultaneously
Seal vertical bonding with barrel, top surface is provided with 1 aperture, sealing bonding has been inserted perpendicularly into one with the bottom water inlet 4 of pressure-measuring pipe 2
With UNICOM's positioning pipe 8 of external diameter.UNICOM's positioning pipe 8 is higher by top surface about 1cm, is easy to seal external PVC water service hoses 7, and with survey
The sealing connection of 2 bottom water inlet of pressure pipe 4, constitutes the sealing ventilating water pipe of the water column of pressure-measuring pipe 2.UNICOM's positioning pipe 8 inserts pressure measurement cylinder
Depth about 1cm, bottom surface level, and keep coplanar with the horizontal plane 20 of the zero point of rack of measuring pressure ruler 3.The lower sidewall of pressure measurement cylinder 9 connects
Nearly bottom surface is provided with a pressure measurement water inlet pipe mouth 10 (water inlet 10), and salable external water service hose is connected to experiment tube to be measured
On the pressure taps such as road, water tank.Pressure tap is all water flowing, and after connection pressure measurement cylinder, water can be entered from bottom sidewall water inlet 10 and surveyed
Inside pressure cylinder 9, after water level reaches top UNICOM's 8 bottom surface horizontal plane 20 of positioning pipe, water level no longer rises, and water can be fixed into UNICOM
Position pipe 8, subsequently enters pressure-measuring pipe 2, forms pressure-measuring pipe water column 19, and the numerical value that scale reads after water-column is stable is pressure measurement
The head pressure of point Relative Zero reference level surface 20.And the bottom surface horizontal plane 20 of UNICOM's positioning pipe 8 in pressure measurement cylinder 9 is arrived at the top of it then
One section of air column can be sealed, due to the bottom surface horizontal plane 20 of UNICOM's positioning pipe 8 it is coplanar with the horizontal plane 20 of rack of measuring pressure zero point of scale,
So, this section of seal compression air column pressure is piezometric head pressure plus atmospheric pressure sum.
In order to measure this section of seal compression air column pressure, an aperture sealing bonding insertion can be opened at the top of pressure measurement cylinder 9
The rustless steel breather 11 (can insert from top, also can insert from upper portion side wall) of a piece internal diameter 2mm, the bottom surface of breather 11 is other
Encounter the highest water surface in bucket, it is soft that breather 11 stays in the salable external hollow vent pressure measurement of about 1cm or so outside pressure measurement cylinder 9
Pipe 12, the 15 1 measurement interfaces of differential fluid pressure sensor of the other end sealing shroud of pressure measurement flexible pipe 12 in pressure-measuring pipe electrical measurement digital display instrument 16
(do not pass through ventilation pressure measurement flexible pipe 12 certainly to connect, directly the measurement mouthpiece 13 of differential pressure pickup 15 is sealed into insertion and surveyed on 13
In the upper air post of pressure cylinder 9, measure the gas column pressure of the top compression of pressure measurement cylinder 9 also can), differential pressure pickup 15 another measurement connects
Mouth 14 directly leads to air, and pressure difference signal finally sends into the pressure that pressure transmitter digital display meter head 17 shows the relatively large air pressure of measuring point
Value, actual to be piezometric head pressure, i.e. pressure-measuring pipe water column scale readings, digital display is the pressure of 44.8cm water columns in Fig. 1.
During specific experiment, the good desktop 18 of level-off is first wanted, it is and to be measured by the water inlet 10 of pressure measurement cylinder 9 by water service hose
Experimental channel or water tank pressure tap draw tubule and be tightly connected, experimental channel or water tank are surveyed when just the beginning and end intake for experiment
The straight-through air of pipeline that the measurement interface 13 of pressure cylinder 9 and differential pressure pickup 15 connects, it is isobaric with measurement interface 14, now need pair with
The pressure transmitter digital display meter head 17 of the connection of differential pressure pickup 15 initially returns to zero.Then start experimental apparatus water pump to supply water, enter
Experiment, according to each experimental procedure, after the water column of pressure-measuring pipe 2 is stable, you can while by ruler on rack of measuring pressure 3, with manual human eye
Traditional approach measures pressure-measuring pipe water-column, can contrast again using the high-acruracy survey of electrical measurement digital displaying meter 16.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate example of the present invention, and and
The non-restriction to embodiment.For those of ordinary skill in the field, can also do on the basis of the above description
Go out the change or variation of other multi-forms.There is no need to be exhaustive to all of embodiment.And thus drawn
Obvious change that Shen goes out or among changing still in protection scope of the present invention.
Claims (9)
1. a kind of liquid gas shift pressure tester, it is characterised in that include：
Pressure measurement cylinder with connection positioning pipe, the connection positioning pipe is inserted from the top of the pressure measurement cylinder, the connection positioning
One end of pipe is located in the pressure measurement cylinder and the end grain is horizontal plane, and the other end is located at outside the pressure measurement cylinder；
It is connected with the pressure measurement cylinder, for detecting the differential pressure pickup of the pressure measurement cylinder compressed air and outside air pressure reduction；
The logical air of a measurement interface in described differential pressure pickup, another measurement interface in described differential pressure pickup passes through
Conduit is tightly connected with the pressure measurement cylinder；
Described conduit inserts one end of the pressure measurement cylinder and is located at the bottom surface of the connection positioning pipe and the top surface of the pressure measurement cylinder
Between, and higher than the bottom surface of the connection positioning pipe；
The bottom of described pressure measurement cylinder is provided with water inlet.
2. it is a kind of to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that to include：
Pressure measurement cylinder with connection positioning pipe, the connection positioning pipe is inserted from the top of the pressure measurement cylinder, the connection positioning
One end of pipe is located in the pressure measurement cylinder, and the other end is located at outside the pressure measurement cylinder；
The pressure-measuring pipe being connected with the one end of the connection positioning pipe outside the pressure measurement cylinder；
Being arranged on around the pressure-measuring pipe is used for the ruler for demarcating liquid level in the pressure-measuring pipe；
It is connected with the pressure measurement cylinder, for detecting the differential pressure pickup of the pressure measurement cylinder compressed air and outside air pressure reduction；
The bottom of described pressure measurement cylinder is provided with water inlet.
3. it is according to claim 2 to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that described pressure measurement
It is provided with the top of pipe for open to atmosphere opening, the bottom of described pressure-measuring pipe connects positioning pipe connection by flexible pipe with described.
4. it is according to claim 2 to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that described connection
The zero graduation same level face of the bottom surface of positioning pipe and the ruler.
5. it is according to claim 2 to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that also to include：Gu
Fixed rack, described pressure-measuring pipe and ruler is installed on the fixed support.
6. it is according to claim 5 to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that described ruler
Elongated hole is provided with, the ruler is fixed on the fixed support by screw with elongated hole cooperation.
7. it is according to claim 2 to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that described pressure reduction
The logical air of a measurement interface in sensor, another measurement interface in described differential pressure pickup is by conduit and the pressure measurement
Cylinder is tightly connected.
8. it is according to claim 7 to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that described conduit
The one end for inserting the pressure measurement cylinder is located between the bottom surface of the connection positioning pipe and the top surface of the pressure measurement cylinder, and higher than described
The bottom surface of connection positioning pipe.
9. it is according to claim 2 to test with the pressure tester with simultaneous electrical measurement digital display, it is characterised in that also to include：With
The pressure transmitter digital display meter head of the differential pressure pickup connection.
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| CN201510148984.2A CN104748903B (en) | 2015-03-31 | 2015-03-31 | Liquid-gas conversion pressure measurement device and pressure measurement device with synchronous electrical measurement and digital display for tests |
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| CN201510148984.2A CN104748903B (en) | 2015-03-31 | 2015-03-31 | Liquid-gas conversion pressure measurement device and pressure measurement device with synchronous electrical measurement and digital display for tests |
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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 |
| CN111834024B (en) * | 2020-07-23 | 2022-02-22 | 中国核动力研究设计院 | On-line accurate measurement method and system for pressure in containment vessel |
| 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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| US6575026B1 (en) * | 2002-06-28 | 2003-06-10 | Eastman Kodak Company | Measuring absolute static pressure at one or more positions along a microfluidic device |
| CN101597914A (en) * | 2008-06-07 | 2009-12-09 | 冯石文 | Self-pressure type water tank |
| TW201331564A (en) * | 2012-01-20 | 2013-08-01 | sen-mu Gao | Structure of sensing liquid pressure by air pressure sensing member |
| CN203688151U (en) * | 2014-01-28 | 2014-07-02 | 马鞍山市奈特仪表科技有限公司 | Oxygen meter calibrator |
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| CN204514523U (en) * | 2015-03-31 | 2015-07-29 | 浙江大学 | Liquid gas shift pressure tester and the experiment pressure tester being with simultaneous electrical measurement digital display |
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