CN202584505U - Test instrument for venturi and orifice plate flowmeters - Google Patents

Test instrument for venturi and orifice plate flowmeters Download PDF

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Publication number
CN202584505U
CN202584505U CN 201220132762 CN201220132762U CN202584505U CN 202584505 U CN202584505 U CN 202584505U CN 201220132762 CN201220132762 CN 201220132762 CN 201220132762 U CN201220132762 U CN 201220132762U CN 202584505 U CN202584505 U CN 202584505U
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China
Prior art keywords
venturi
piezometric tube
orifice plate
orifice
test
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Expired - Fee Related
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CN 201220132762
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Chinese (zh)
Inventor
张志昌
刘亚菲
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Xian University of Technology
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Xian University of Technology
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Abstract

The utility model discloses a test instrument for venturi and orifice plate flowmeters , which comprises a test table. A test pipeline is arranged on the test table and a water supply tank is arranged below the test table. A water supply pump is arranged inside the water supply tank. The water supply pump is connected with the test pipeline via a water supply pipe. An upstream regulating valve is arranged on the water supply pipe. A venture flowmeter is arranged on the test pipeline. The upstream place and the throat place of the venture flowmeter are respectively correspondingly connected with a pressure test pipe. The orifice plate flowmeter is arranged at the downstream of the test pipeline. A pressure test pipe is correspondingly arranged at the upstream and the downstream place of the orifice plate flowmeter respectively. A downstream regulating valve is further arranged on the test pipeline. The downstream end part of the test pipeline is a water discharge end. A water guide drawer and a water container are arranged below the water discharge end, wherein the water container is communicated with the water supply tank. The test instrument for venturi and orifice plate flowmeters further comprises a measuring ruler, a differential pressure sensor and a weighing sensor. The test instrument for venturi and orifice plate flowmeters can be used for measuring flow coefficients of the venturi flowmeter and flow coefficients of the orifice plate flowmeter.

Description

Venturi and orifice flowmeter test instrument
Technical field
The utility model belongs to fluid mechanics test apparatus technical field, is specifically related to a kind of venturi and orifice flowmeter test instrument.
Background technology
Venturi and orifice flowmeter test are one of tests necessary in fluid mechanics (hydraulics) teaching.
At present, Venturi meter and orifice flowmeter are designs separately and use that its both test principles are identical with test method; But coefficient of flow has a long way to go; Therefore make an experiment if in teaching, can combine and contrast, comparison of test results is more directly perceived, and teaching efficiency can be better.In addition, the power of existing Venturi meter test instrument loss is big, and the space that occupies is big, operation inconvenience; The pressure reduction of measuring and the scope of Reynolds number is little (it is generally acknowledged reynolds number Re＞2 * 10 5, coefficient of flow is just irrelevant with Reynolds number, and the coefficient of flow that provides in the hydraulics teaching material is all in Re＞2 * 10 5After), test accuracy is not high, and data measured does not reach the purpose of real standard very little.
Summary of the invention
The purpose of the utility model provides a kind of venturi and orifice flowmeter test instrument, can be used to measure the coefficient of flow of Venturi meter and the coefficient of flow of orifice flowmeter, and the pressure reduction of measurement and the scope of Reynolds number are big, and test accuracy is high.
The technical scheme that the utility model adopted is that a kind of venturi and orifice flowmeter test instrument is characterized in that; Comprise testing table; Testing table is provided with level to test pipe, and the testing table below is provided with supply tank, and make-up pump is installed in the supply tank; Make-up pump is connected with test pipe through upper hose; The upstream regulation valve is installed on the upper hose, Venturi meter is installed on the test pipe, the upper reaches of Venturi meter and venturi place correspondence respectively are connected with Venturi meter upper reaches piezometric tube and Venturi meter venturi piezometric tube; The far-end of Venturi meter upper reaches piezometric tube and Venturi meter venturi piezometric tube is provided with straight up, and and atmosphere;
On the test pipe and the downstream that are positioned at Venturi meter are equipped with orifice flowmeter; On the test pipe and the upstream and downstream place that is positioned at orifice flowmeter correspondence respectively is equipped with orifice plate upper reaches piezometric tube and orifice plate downstream piezometric tube; The far-end of orifice plate upper reaches piezometric tube and orifice plate downstream piezometric tube is provided with straight up, and and atmosphere;
The downstream damper door also is installed on the test pipe; The downstream end of test pipe is the water side; The below, water side is provided with the water guide drawer, and the water guide drawer is tilted to down setting and inside is equipped with limit switch, and the water delivering orifice below of water guide drawer is provided with water container; The below of water container is equipped with LOAD CELLS, and water container communicates with supply tank;
All respectively be equipped with one between the far-end of the far-end of Venturi meter upper reaches piezometric tube and Venturi meter venturi piezometric tube and between the far-end of the far-end of orifice plate upper reaches piezometric tube and orifice plate downstream piezometric tube and survey chi; All through piping erection one differential pressure pickup is arranged between Venturi meter upper reaches piezometric tube and the Venturi meter venturi piezometric tube and between orifice plate upper reaches piezometric tube and the orifice plate downstream piezometric tube, LOAD CELLS all is connected with the differential pressure flow measuring instrument with two differential pressure pickups.
Test pipe is installed on the testing table through a plurality of supports.
Two flanges are installed on the test pipe, and Venturi meter is installed between two flanges.
Venturi meter upper reaches piezometric tube and Venturi meter venturi piezometric tube all are fixed on the pressure measurement row; Orifice plate upper reaches piezometric tube and orifice plate downstream piezometric tube all are fixed on another pressure measurement row; The exhaust passage is established in two pressure measurement rows' top; Venturi meter upper reaches piezometric tube and Venturi meter venturi piezometric tube and orifice plate upper reaches piezometric tube and orifice plate downstream piezometric tube communicate with corresponding exhaust passage; All be connected with a gas outlet on two exhaust passages, on two gas outlets a drain tap be installed all.
Between Venturi meter and the orifice flowmeter at a distance of 60cm～70cm.
On the test pipe and the downstream that are positioned at Venturi meter are equipped with two orifice flanges, and orifice flowmeter is installed between two orifice flanges.
The downstream end of test pipe is equipped with water exit elbow, and the water guide drawer is positioned at the below of water exit elbow.
Unwatering pump is installed in the water container, and unwatering pump communicates with osculum on the water container, and osculum is arranged with water spilage tray, and water spilage tray communicates with supply tank through return pipe.
The utility model has solved existing test apparatus can only singlely carry out Venturi meter test or orifice flowmeter test; Can be used to measure the coefficient of flow of Venturi meter and the coefficient of flow of orifice flowmeter; And the pressure reduction of measuring and the scope of Reynolds number are big, and test accuracy is high.In addition, when adopting the utility model to make an experiment, can adopt two kinds of different measurement systems, make the student can grasp modern measurement technology, can pass on traditional measurement technology again.The utility model test instrument volume is little, simple in structure, easy to manufacture, and precision is high, and is easy to operate.
Description of drawings
Fig. 1 is the structural representation of the utility model venturi and orifice flowmeter test instrument;
Wherein, 1. supply tank, 2. make-up pump, 3. upper hose, 4. upstream regulation valve, 5. test pipe; 6. support 7. flange, 8. Venturi meter, 9. Venturi meter upper reaches piezometric tube, 10. Venturi meter venturi piezometric tube, 11. pressure measurement row; 12. gas outlet, 13. drain taps, 14. exhaust passages, 15. survey chi, 16. orifice flowmeters, 17. orifice flanges; 18. orifice plate upper reaches piezometric tube, 19 orifice plate downstream piezometric tube, 20. differential pressure pickups, 21. differential pressure flow measuring instruments, 22. downstream damper doors; 23. water exit elbow, 24. water guide drawers, 25. limit switches, 26. water containers, 27. LOAD CELLSs; 28. unwatering pump, 29. osculums, 30. water spilage trays, 31. return pipes, 32. testing tables.
Embodiment
As shown in Figure 1; The utility model venturi and orifice flowmeter test instrument; Comprise testing table 32, level is installed to test pipe 5 through a plurality of supports 6 on the testing table 32, testing table 32 belows are provided with supply tank 1; Make-up pump 2 is installed in the supply tank 1, and make-up pump 2 is connected with test pipe 5 through upper hose 3.Upstream regulation valve 4 is installed on the upper hose 3.Two flanges 7 are installed on the test pipe 5, and Venturi meter 8 is installed between two flanges 7.
The upper reaches of Venturi meter 8 and venturi place correspondence respectively are connected with Venturi meter upper reaches piezometric tube 9 and Venturi meter venturi piezometric tube 10.The far-end of Venturi meter upper reaches piezometric tube 9 and Venturi meter venturi piezometric tube 10 is provided with straight up, and and atmosphere.
On the test pipe 5 and downstream that are positioned at Venturi meter 8 are equipped with orifice flowmeter 16.On the test pipe 5 and downstream that are positioned at Venturi meter 8 are equipped with two orifice flanges 17, and orifice flowmeter 16 is installed between two orifice flanges 17.Between Venturi meter 8 and the orifice flowmeter 16 at a distance of 60cm～70cm.On the test pipe 5 and upstream and downstream place that is positioned at orifice flowmeter 16 correspondence respectively is equipped with orifice plate upper reaches piezometric tube 18 and orifice plate downstream piezometric tube 19.The far-end of orifice plate upper reaches piezometric tube 18 and orifice plate downstream piezometric tube 19 is provided with straight up, and and atmosphere.
Downstream damper door 22 also is installed on the test pipe 5.The downstream end of test pipe 5 is the water side, and the below, water side is provided with water guide drawer 24.Water guide drawer 24 is tilted to down setting and inside is equipped with limit switch 25, and limit switch 25 is used for the Measuring Time of Control Flow and pressure reduction.The water delivering orifice below of water guide drawer 24 is provided with water container 26, and the below of water container 26 is equipped with LOAD CELLS 27, and LOAD CELLS 27 weighs up the weight of water in the measurement period, and its weight is flow divided by Measuring Time.Water container 26 communicates with supply tank 1, and total system is a self-circulation system.Specifically: the downstream end of test pipe 5 is equipped with water exit elbow 23, and water guide drawer 24 is positioned at the below of water exit elbow 23.Unwatering pump 28 is installed in the water container 26, and unwatering pump 28 communicates with osculum 29 on the water container 26, and osculum 29 is arranged with water spilage tray 30, and water spilage tray 30 communicates with supply tank 1 through return pipe 31.
Be equipped with one between the far-end of the far-end of Venturi meter upper reaches piezometric tube 9 and Venturi meter venturi piezometric tube 10 and survey chi 15, another is installed between far-end of the far-end of orifice plate upper reaches piezometric tube 18 and orifice plate downstream piezometric tube 19 surveys chi 15.Survey the pressure reduction that chi 15 is used to measure corresponding two piezometric tube.Measure pressure reduction and flow in order to use electrical measuring method; Between Venturi meter upper reaches piezometric tube 9 and the Venturi meter venturi piezometric tube 10 differential pressure pickup 20 is installed; All one differential pressure pickup 20 is arranged between orifice plate upper reaches piezometric tube 18 and the orifice plate downstream piezometric tube 19 through piping erection; LOAD CELLS 27 all is connected with differential pressure flow measuring instrument 21 with two differential pressure pickups 20, goes out pressure reduction and flow in the measurement period through calculation display.
Venturi meter upper reaches piezometric tube 9 all is fixed on the pressure measurement row 11 with Venturi meter venturi piezometric tube 10, and orifice plate upper reaches piezometric tube 18 all is fixed on another pressure measurement row 11 with orifice plate downstream piezometric tube 19.Exhaust passage 14 is established in two pressure measurement rows' 11 top; Venturi meter upper reaches piezometric tube 9 and Venturi meter venturi piezometric tube 10 and orifice plate upper reaches piezometric tube 18 and orifice plate downstream piezometric tube 19 communicate with corresponding exhaust passage 14; All be connected with on two exhaust passages 14 on 12, two gas outlets 12 of a gas outlet drain tap 13 all is installed.
Venturi meter is the instrument that a kind of pipeline flow is measured; It is by contraction section; Venturi section and diffuser three parts are formed, and trip above that and venturi place correspondence respectively are connected with Venturi meter upper reaches piezometric tube 9 and Venturi meter venturi piezometric tube 10, measure the pressure reduction of these two sections.Through measuring the theoretical delivery that pressure reduction just can calculate Venturi meter.
Orifice flowmeter is the same with Venturi meter, also is a kind of pipeline flow surveying instrument.It is made up of upstream and downstream pipeline, orifice plate three parts.Orifice plate is a round-meshed thin plate in centre, and the diameter of circular hole is littler than caliber.Can find out that from the flow-shape figure of orifice flowmeter liquid has begun to shrink before the orifice plate cross section, liquid does not spread but the continuation contraction immediately behind the orifice plate of flowing through, and spreads through just beginning behind the segment distance, is diffused into the whole pipe cross section at last.Because it is bigger that flow changes, thereby before and after orifice plate, produce vortex cavity and bigger pressure reduction before and after orifice plate.
The operation steps of the utility model device is:
One, method for automatic measurement
On step 1, the record Venturi meter 8, Venturi meter upper reaches piezometric tube 9 and 10 liang of diameters of locating pipeline of Venturi meter venturi piezometric tube are installed;
The diameter of record orifice flowmeter 16, and orifice plate upper reaches piezometric tube 18 and 19 liang of diameters of locating pipeline of orifice plate downstream piezometric tube are installed on the test pipe 5.
Step 2, open the power supply of differential pressure flow measuring instrument 21, with differential pressure flow measuring instrument 21 preheatings 15 minutes.
Step 3, open make-up pump 2, open upstream regulation valve 4 and downstream damper door 22, making installs pipes is full of water.
Step 4, treat waterflow stabilization after, water guide drawer 24 is pulled out, at this moment differential pressure flow measuring instrument 21 shows the transient change value of weight, time and pressure reduction.
Step 5, water guide drawer 24 is advanced, this measures end, leaves standstill for 10 seconds, and net weight, Measuring Time and the pressure reduction of the water of this measurement of demonstration are recorded in this measurement result in the corresponding form on the differential pressure flow measuring instrument 21.
Step 6, open unwatering pump 28, the water in the water container 26 is discharged in the water spilage tray 30 through osculum 29, treat that water in the water container 26 has been arranged or discharged and to begin to measure for the second time after stopping.
Step 7, the switching value of regulating downstream flowing water Valve 22, and repeating step 5 is measured for many times and record data with step 6.
After step 8, the off-test instrument is restored to the original state.
Step 9, measurement data is carried out analytical calculation.
Two, traditional measurement method
On step 1, the record Venturi meter 8, Venturi meter upper reaches piezometric tube 9 and 10 liang of diameters of locating pipeline of Venturi meter venturi piezometric tube are installed;
The diameter of record orifice flowmeter 16, and orifice plate upper reaches piezometric tube 18 and 19 liang of diameters of locating pipeline of orifice plate downstream piezometric tube are installed on the test pipe 5.
Step 2, water guide drawer 24 is adjusted at the appropriate location, the current that flow out from water exit elbow 23 are flowed directly into the water spilage tray 30.
Step 3, open water pump 2, open upstream regulation valve 4 and downstream damper door 22, make system pipeline be full of water.
Step 4, close downstream damper door 22, open two drain taps 13, the air in Venturi meter upper reaches piezometric tube 9, Venturi meter venturi piezometric tube 10, orifice plate upper reaches piezometric tube 18 and the orifice plate downstream piezometric tube 19 is discharged.
Step 5, open downstream damper door 22; Turn the switching value (note this moment can not close fully) of upstream regulation valve 4 gradually down, make head in Venturi meter upper reaches piezometric tube 9, Venturi meter venturi piezometric tube 10, orifice plate upper reaches piezometric tube 18 and the orifice plate downstream piezometric tube 19 drop to corresponding pressure measurement row's 11 bottom position, close two drain taps 13; Close downstream damper door 22; At this moment, can see that the water surface in Venturi meter upper reaches piezometric tube 9, Venturi meter venturi piezometric tube 10, orifice plate upper reaches piezometric tube 18 and the orifice plate downstream piezometric tube 19 rises, if the air in these four piezometric tube has drained only; Then the head line in each piezometric tube flushes separately; If do not flush, prove that air not arranged, also need continue exhaust.
Step 6, open upstream regulation valve 4 fully, regulate the switching value of downstream damper door 22, observe the variation of the head in four piezometric tube.
Step 7, treat waterflow stabilization after, measure flow with graduated cylinder and stopwatch, survey the pressure reduction that chis 15 obtain two piezometric tube of correspondence respectively with two.
Step 8, adjusting downstream flowing water Valve 22 reduce flow gradually, and repeat above-mentioned steps and repeatedly measure also record data.
After step 9, the off-test instrument is restored to the original state.
Step 10, measurement data is carried out analytical calculation.

Claims (8)

1. venturi and orifice flowmeter test instrument; It is characterized in that, comprise testing table (32), said testing table (32) is provided with level to test pipe (5); Said testing table (32) below is provided with supply tank (1); Make-up pump (2) is installed in the said supply tank (1), and said make-up pump (2) is connected with test pipe (5) through upper hose (3), and upstream regulation valve (4) is installed on the said upper hose (3); Venturi meter (8) is installed on the said test pipe (5); The upper reaches of said Venturi meter (8) and venturi place correspondence respectively are connected with Venturi meter upper reaches piezometric tube (9) and Venturi meter venturi piezometric tube (10), and the far-end of said Venturi meter upper reaches piezometric tube (9) and Venturi meter venturi piezometric tube (10) is provided with straight up, and and atmosphere;
Said test pipe (5) is gone up and the downstream that are positioned at Venturi meter (8) are equipped with orifice flowmeter (16); Said test pipe (5) go up and the upstream and downstream place that is positioned at orifice flowmeter (16) respectively correspondence orifice plate upper reaches piezometric tube (18) and orifice plate downstream piezometric tube (19) are installed; The far-end of said orifice plate upper reaches piezometric tube (18) and orifice plate downstream piezometric tube (19) is provided with straight up, and and atmosphere;
Downstream damper door (22) also is installed on the said test pipe (5); The downstream end of said test pipe (5) is the water side; Below, said water side is provided with water guide drawer (24), and said water guide drawer (24) is tilted to down setting and inside is equipped with limit switch (25), and the water delivering orifice below of said water guide drawer (24) is provided with water container (26); The below of said water container (26) is equipped with LOAD CELLS (27), and said water container (26) communicates with supply tank (1);
All respectively be equipped with one between the far-end of the far-end of said Venturi meter upper reaches piezometric tube (9) and Venturi meter venturi piezometric tube (10) and between the far-end of the far-end of orifice plate upper reaches piezometric tube (18) and orifice plate downstream piezometric tube (19) and survey chi (15); All through piping erection one differential pressure pickup (20) is arranged between said Venturi meter upper reaches piezometric tube (9) and the Venturi meter venturi piezometric tube (10) and between orifice plate upper reaches piezometric tube (18) and the orifice plate downstream piezometric tube (19), said LOAD CELLS (27) all is connected with differential pressure flow measuring instrument (21) with two differential pressure pickups (20).
2. according to described venturi of claim 1 and orifice flowmeter test instrument, it is characterized in that said test pipe (5) is installed on the testing table (32) through a plurality of supports (6).
3. according to described venturi of claim 1 and orifice flowmeter test instrument, it is characterized in that two flanges (7) are installed on the said test pipe (5), and said Venturi meter (8) is installed between two flanges (7).
4. according to described venturi of claim 1 and orifice flowmeter test instrument; It is characterized in that; Said Venturi meter upper reaches piezometric tube (9) and Venturi meter venturi piezometric tube (10) all are fixed on the pressure measurement row (11); Said orifice plate upper reaches piezometric tube (18) and orifice plate downstream piezometric tube (19) all are fixed on another pressure measurement row (11); Exhaust passage (14) is established in said two pressure measurement rows' (11) top; Said Venturi meter upper reaches piezometric tube (9) and Venturi meter venturi piezometric tube (10) and orifice plate upper reaches piezometric tube (18) and orifice plate downstream piezometric tube (19) communicate with corresponding exhaust passage (14), all are connected with a gas outlet (12) on said two exhaust passages (14), and a drain tap (13) all is installed on said two gas outlets (12).
5. according to described venturi of claim 1 and orifice flowmeter test instrument, it is characterized in that, between said Venturi meter (8) and the orifice flowmeter (16) at a distance of 60cm～70cm.
6. according to described venturi of claim 1 and orifice flowmeter test instrument; It is characterized in that; Said test pipe (5) is gone up and the downstream that are positioned at Venturi meter (8) are equipped with two orifice flanges (17), and said orifice flowmeter (16) is installed between two orifice flanges (17).
7. according to described venturi of claim 1 and orifice flowmeter test instrument, it is characterized in that the downstream end of said test pipe (5) is equipped with water exit elbow (23), said water guide drawer (24) is positioned at the below of water exit elbow (23).
8. according to described venturi of claim 1 and orifice flowmeter test instrument; It is characterized in that; Unwatering pump (28) is installed in the said water container (26); Said unwatering pump (28) communicates with osculum (29) on the water container (26), and said osculum (29) is arranged with water spilage tray (30), and said water spilage tray (30) communicates with supply tank (1) through return pipe (31).
CN 201220132762 2012-03-31 2012-03-31 Test instrument for venturi and orifice plate flowmeters Expired - Fee Related CN202584505U (en)

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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104751710A (en) * 2015-03-31 2015-07-01 浙江大学 Bar type pressure measuring device with circuit electric measurement digital display
CN104807508A (en) * 2015-04-13 2015-07-29 浙江大学 Digital display flow meter for experiment teaching based on piezometer tube display and measuring method thereof
CN104882048A (en) * 2015-06-02 2015-09-02 浙江大学 Piston-type momentum experiment instrument with teaching effect flow digital-display function
CN104952323A (en) * 2015-06-12 2015-09-30 浙江大学 Self-circulation Bernoulli experimental device with teaching effect flow digital display function
CN105043470A (en) * 2015-04-30 2015-11-11 宁波职业技术学院 Open type flow measurement system device for teaching
CN105590538A (en) * 2016-02-27 2016-05-18 山东大学（威海） Gas heat exchanger and air flow measurement experimental device
CN110220575A (en) * 2019-07-02 2019-09-10 西南交通大学 A kind of device measuring Venturi meter coefficient
CN110346019A (en) * 2019-08-01 2019-10-18 郑州拽亘电子科技有限公司 A kind of water ga(u)ge calibration method of building element testing machine

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104751710A (en) * 2015-03-31 2015-07-01 浙江大学 Bar type pressure measuring device with circuit electric measurement digital display
CN104807508A (en) * 2015-04-13 2015-07-29 浙江大学 Digital display flow meter for experiment teaching based on piezometer tube display and measuring method thereof
CN104807508B (en) * 2015-04-13 2018-01-05 浙江大学 A kind of experimental teaching is with the digital indication flow meter and measuring method shown with pressure-measuring pipe
CN105043470A (en) * 2015-04-30 2015-11-11 宁波职业技术学院 Open type flow measurement system device for teaching
CN104882048B (en) * 2015-06-02 2017-08-08 浙江大学 A kind of piston type momentum testing equipment for possessing teaching efficiency flow digital display
CN104882048A (en) * 2015-06-02 2015-09-02 浙江大学 Piston-type momentum experiment instrument with teaching effect flow digital-display function
CN104952323A (en) * 2015-06-12 2015-09-30 浙江大学 Self-circulation Bernoulli experimental device with teaching effect flow digital display function
CN104952323B (en) * 2015-06-12 2017-08-08 浙江大学 Possesses self-loopa Bernoulli Jacob's experimental provision of teaching efficiency flow digital display
CN105590538B (en) * 2016-02-27 2017-07-14 山东大学（威海） A kind of gas flow measurement experimental provision
CN107121178A (en) * 2016-02-27 2017-09-01 山东大学（威海） A kind of gas flow measurement experimental provision of flow control
CN105590538A (en) * 2016-02-27 2016-05-18 山东大学（威海） Gas heat exchanger and air flow measurement experimental device
CN107121178B (en) * 2016-02-27 2019-03-29 山东大学 A kind of gas flow measurement experimental provision of flow control
CN110220575A (en) * 2019-07-02 2019-09-10 西南交通大学 A kind of device measuring Venturi meter coefficient
CN110220575B (en) * 2019-07-02 2020-09-22 西南交通大学 Device for measuring flow coefficient of venturi flowmeter
CN110346019A (en) * 2019-08-01 2019-10-18 郑州拽亘电子科技有限公司 A kind of water ga(u)ge calibration method of building element testing machine

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