CN85106933A - Flow indicator for hulsating liquid - Google Patents
Flow indicator for hulsating liquid Download PDFInfo
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- CN85106933A CN85106933A CN85106933.9A CN85106933A CN85106933A CN 85106933 A CN85106933 A CN 85106933A CN 85106933 A CN85106933 A CN 85106933A CN 85106933 A CN85106933 A CN 85106933A
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Abstract
The present invention is a flow instrument.When prior art is measured liquid pulsation flow in the pipeline, can produce very big root-mean-square error.The present invention has fundamentally eliminated error source.Upper and lower end is connected the airtight container of going up interface and lower interface, and the inside has a dividing plate that has an aperture container to be divided into the pressure regulating cavity of superposed main chamber and bottom.A balance pipe is communicated with main chamber and pressure regulating cavity.But a flow display device pin-point accuracy is measured the flow of pulsating flow, steady flow and small stream.Apparatus structure is simple, and no high-precision part is made easily.Operation and maintenance is easy.
Description
The present invention is a flow instrument, particularly the flow indicator for hulsating liquid table in the pressure piping.
Ultimate principle of the present invention, published on " instrumentation technology " first phase in 1984, this Qi Za Chi describes a narrow meshed open-top receptacle in bottom, when fluid to be measured is poured into container, can in container, form a liquid level, by being communicated with the glass tube of being with scale with the container bottom, from liquid level position, readable the fluid flow that is poured into container.This instrument can outer liquid steady flow and the pulsating flow of normal measuring tube way outlet.
Increase is advanced to instrument simply.Go out liquid interface, instrument can be connected in the pipeline.
At first will go up on the interface access tube way outlet, when in the pipeline during liquid inlet container, to be full of by liquid in the container and can not form liquid level, but have a liquid level in glass tube, this liquid level is represented near the fluid pressure of aperture, and small hole stream is to atmosphere, atmospheric pressure can be thought constant, liquid level in the glass tube, size falls in the pressure when in fact flowing through aperture with regard to express liquid, and this pressure falls with flow by aperture the relation of determining.Instrument in fact just became and was used for the differential flowmeter of flow on the measuring tube way outlet this moment.
If all insert in the pipeline upper and lower interface, then not only relevant with the fluid pressure before the aperture by the flow value of aperture, but also it is relevant with the fluid pressure behind the aperture, and this laboratory glass wares pipe only can pass through the preceding pressure of aperture by express liquid, on behalf of liquid, this pressure can not fall by the pressure of aperture, thereby be connected on instrument in the pipeline will be not the flow on energy measurement flowing pipe road, if add a glass tube in the aperture back, then instrument has just become a general differential flowmeter.
The U.S.'s 4136692 patents and French 2341841 patents are same Patents, it is the medical flowmeter that is used to measure to patient infusion dropper flow, also be according to flow of liquid when the narrow meshed pipe, on aperture, produce the flow instrument that pressure falls and the fluid flow of the aperture of flowing through has definite relation principle and design, during measurement narrow meshed pipe be full of by liquid and with pipeline in liquid connect together, the pressure difference value that liquid passes through also be use with small hole stream before with aperture near liquid level in the display tube that is communicated with represent; Thereby the described flowmeter of this patent is still a kind of differential flowmeter in fact.
As long-established theory research and test pointed because fluid flow and pressure are the pulsation change of properties in the pipeline.This variation continuously near the aperture transmission makes aperture the pressure of liquid also be the variation of the character of pulsing, it is time to time change that the pressure of aperture liquid of promptly flowing through falls, carry out the flow measurement meeting with differential flowmeter in the case and produce " root-mean-square error ", (square-roof-error) promptly
And the error of bringing.Have data to show, because the influence of pulsating flow makes differential flowmeter when measuring pulsating flow, it " indicates flow to reach the twice of real flow " (river Tian Yulang etc., flow measurement handbook, metering publishing house 1982, first published P388).
As seen, above-mentioned two kinds of flowmeters are unsuitable for measuring the pulsating flow in the pipeline basically.
Task of the present invention is, seek a kind of new apparatus structure, make it in measuring pipeline during the liquid pulsation flow, fundamentally overcome in the pipeline measuring error that transmission that the pressure because of pulsing gluid changes brings, guarantee instrument not only to the steady flow in the pipeline, and also can measure accurately the pulsating flow in the middle of the pipeline.
Instrument basic structure of the present invention is, a container, its upper and lower end is useful on instrument is inserted last interface (1) lower interface (18) in the pipeline, be divided into main chamber (22) that is positioned at container top and the pressure regulating cavity (21) that is positioned at the container bottom by a dividing plate (14) that has at least one aperture in the container, be communicated with a balance pipe (13) between main chamber (22) and the pressure regulating cavity (21), the display device (12) that the liquid level H in main chamber (22) is converted to flow value is arranged.
In the last interface (1) and lower interface (18) cut-in pressure pipeline with instrument, fluid to be measured leaks into main chamber (22) from last interface (1) through the space on top, main chamber (22), aperture on dividing plate (14) flows into pressure regulating cavity (21), enters the pipeline through lower interface (18) from pressure regulating cavity (21) again.The effect of balance pipe (13) and pressure regulating cavity (21) is, when flow of liquid during through instrument.In main chamber (22), form liquid level (11).Form liquid level (16) in the pressure regulating cavity, make the fluid separation applications of pulsation character in interior delay liquid in main chamber (22) and the pipeline, like this, the pressure of liquid pulsation character changes the directly delay liquid transfer in main chamber (22) in the pipeline, just fundamentally eliminate prior art error source during pulsating flow in the gaging pressure pipeline, thereby eliminated root-mean-square error.Another effect of balance pipe (13) and pressure regulating cavity (21) is to guarantee that the pressure of liquid level (16) and liquid level (11) superjacent air space is identical all the time, and this identical, is not subjected to the influence of average discharge and mean pressure variations in the pipeline.Suppose that the average discharge in the pipeline keeps constant relatively again after a step changes, the height H of main intraluminal fluid face (11) also can change thereupon and be tending towards relatively stable, and this moment, instrument promptly reached " mobile equilibrium " state.For any average discharge Q
n, corresponding height H will be arranged
nCorresponding with it, i.e. H
n=f(Q
n) determine.From the display device that liquid level H is converted to flow value is the average flow value Q of readable the instrument of flowing through
n
Effect of the present invention:
1. Instrument measuring precision height, present stage is measured the diesel oil medium, and system's resultnat accuracy has reached 0.2%.
2. instrument does not have high precision part in addition, does not need special manufacturing process and equipment just can make, and is cheap.
3. apparatus structure is simple, reliable operation, general Maintenance free and repairing in the use.
4. the instrument application scope is wide, steady flow, and pulsating flow, the flow of liquid such as small stream stream can both be measured.
5. accuracy of instrument is not subjected to the influence of fluid to be measured density, and allows to exist in the liquid particle of going up the size of aperture less than central dividing plate (14).
6. when measuring pulsating flow, the liquid that flows out from instrument lower interface (17) is in close proximity to steady flow, so instrument also has rectification effect.
7. the air that is mixed in the pipeline liquid stream can be separated out in pressure regulating cavity (21), and regularly discharges by cutting down door (18), thereby instrument is got rid of the effect of gas in the pipeline liquid stream in addition.
8. instrument can be directly used in certain liquid-consumed or leak closed-circuit system, for example: be used for internal combustion engine dry sump lubrication system consumption of lubricating oil automatic measurement and replenish.
Accompanying drawing 1.2.3. is a preferred forms of the present invention.
The direction of arrow among the figure is the flow through direction of fluid to be measured in instrument.
The instrument structure name claims and sequence number among the figure:
Last interface (1), cut down door (2), influent stream pipe (3), secondary balance pipe (7) stretches into cushion chamber part (4), cushion chamber (5), secondary cushion chamber (5), secondary cushion chamber liquid level (6), secondary balance pipe (7), secondary dividing plate (8), drainage umbrella (9), display tube and balance pipe stretch into the part (10) in the main chamber (22), main intraluminal fluid face (11), display tube (12), balance pipe (13), dividing plate (14), drainage sieve plate (15), pressure regulating cavity liquid level (16), pressure regulating cavity liquid level charactron (17), lower interface (18), cut down door (19), cut down door (20), pressure regulating cavity (21), main chamber (22), cut down door (23), secondary chamber (24), chamber wall (25).
Shown in the figure (1), be to be used for the instrument universal architecture of precision measurement general aspects pulsating flow.Instrument is made up of a closed container of vertically installing, and the upper and lower end of container is communicated with last interface (1) and lower interface (18), so that in the instrument cut-in pressure pipeline.A dividing plate (14) that has at least one aperture is arranged in the container, container is divided into main chamber (22) that is positioned at container top and the pressure regulating cavity (21) that is positioned at the container bottom, and a balance pipe (13) is being communicated with two chambeies near main chamber (22) and position, pressure regulating cavity (21) top.Liquid level in the main chamber (11) available at least one main chamber (22) interior liquid level H is converted to the display device (12) of flow value.With the several apertures on the dividing plate (14) inaccessible one or several, by residue not the area of passage sum of inaccessible aperture on corresponding display device (12), read flow value.Can enlarge the range of instrument so greatly.
Connect one between last interface (1) and main chamber (22) and cut down door (2), main chamber (22) is provided with a drainage umbrella (9) with the top of balance pipe (13) junction, drainage umbrella (9) constitutes cushion chamber (5) with chamber wall (25), buffering energy dissipating thing can be set in the cushion chamber (5), form the slit between the edge of drainage umbrella (9) and the chamber wall (25); One end of an influent stream pipe (3) is connected with drainage umbrella (9), and the other end is connected with cutting down door (2), and influent stream pipe side has flow-in hole; One end of a secondary balance pipe (7) is communicated with balance pipe (13).The other end is communicated with cushion chamber (5), and stretches into cushion chamber (5) the inside, stretches into secondary cushion chamber the inside.Stretch into part (4) outlet and point to down, pay balance pipe (7) to stop liquid to flow into.Such structure can gently flow into main chamber (22) along chamber wall (25) with the pulsing gluid in the pipeline after preliminary slow pulsation is handled.
The display device that liquid level in main chamber (22) is converted to flow value can be the display tube (12) that one or a few transparent material is made, scale on its tube wall also can be arranged on one or several graduated scale in addition, the position of graduated scale and display tube can be regulated, so that compensation is because the measuring error that various factors brings.Liquid level-flow conversion equipment can also be one or several condenser type, electromagnetic type, sound wave type, radiant type, pressure type or other forms of liquid level-flow conversion display device.So that realize functions such as digital demonstration, teletransmission, flow accumulation, error auto compensatng.
In order to shorten the reaction time of instrument, main chamber is corresponding to showing that (12) minimum scale line can be less than the cross-sectional area at other positions, main chamber (22) with the cross-sectional area of lower part.
After not causing flow of liquid to go into balance pipe (13), balance pipe (13) upper end and main chamber (22) are communicated with, extend into the inside, main chamber (22) always, and stretch into part (10) and export in the sensing.
The available transparent material of pressure regulating cavity (21) is made, with demonstration, intraluminal fluid face (16), the transparent liquid level tube of band scale (17) that also available upper and lower end is connected with pressure regulating cavity.Drainage folliculus foam thing (15) can be set in the pressure regulating cavity (21) may be from the bubble instrument lower interface (18) the inflow pipeline to filter down.
Connect one between pressure regulating cavity (21) and the lower interface (18) and cut down door (19), door (20) is cut down in one of the side connection of pressure regulating cavity (21), top, main chamber (22) also can be connected one and cut down door (23).When flow in the pipeline surpasses the ultimate design flow of instrument, utilize these to cut down door and excess liquid in the instrument can be got rid of.
For example when the flow in the pipeline is higher than the maximum limit of instruments design, can close cutting down door (2), (19), to cut down door (23), (20) opens, with the excessive fluid removal that retains in the instrument, when treating that flow recovers normal value, to cut down again door (23), (20) close with cut down door (19), open (2), makes instrument recover operate as normal.Cut down door (20) and also can be used to discharging regularly and from pipeline, separate out, and remain in gas in the pressure regulating cavity (21).
Shown in Figure 2, be the apparatus structure that is suitable for all very little pulsating flow of Measuring Time constant and factor of non-uniform flow, relatively removed drainage umbrella (9) and secondary balance pipe (7) with figure (1), with the sealing of influent stream pipe (3) lower end, thereby make the apparatus structure simplification.
Shown in Figure 3, be that to be suitable for the Measuring Time constant big, " combined type " high precision of the pulsating flow that factor of non-uniform flow is very little, high efficiency surveying instrument.
On Fig. 1 basis, the sealing of drainage tube (3) lower end is thrown off in influent stream pipe (3) and drainage umbrella (9) junction.Usefulness has the secondary dividing plate (8) of an aperture at least between stream pipe (3) lower end and drainage umbrella (9), cushion chamber (5) is divided into superposed secondary cushion chamber (5) and is positioned at the secondary chamber (24) of bottom.One end of secondary balance pipe (7) is communicated with secondary cushion chamber (5), the other end is communicated with secondary chamber (24), such structure can make pulsating flow enter main chamber (22) to make the nonuniformity coefficient of pulsating flow that by a relatively large margin increase is arranged before, can with the aperture on the secondary dividing plate inaccessible one or several, to adapt with the flow of different ranges.
Instrument can also be used for certain liquid-consumed or closed-circuit system continuous automatic measurement of leaking and replenish, as be used for the automatic measurement of internal combustion engine dry sump lubrication system oil consumption and replenish, pressure regulating cavity during application (21) is connected with the inlet and the oil return delivery side of pump of the oil-feed pump of closed-circuit system; The voltage stabilizing spill box that last interface and is established in addition is communicated with.Cut down door (2) and open, cut down door (19), (20), (23) are closed.
Claims (10)
1, the present invention is a flow instrument, flow indicator for hulsating liquid table in the pressure piping particularly, and an open-top receptacle, an aperture is arranged at the bottom, and a lower end that has the glass tube of scale is communicated with near following position with container, and container is vertically installed.It is characterized in that, there is one to have at least the dividing plate (14) of an aperture that container is divided into main chamber (22) that is positioned at container top and the pressure regulating cavity (21) that is positioned at the container bottom in the closed container that upper and lower end is communicated with last interface (1) and lower interface (18) respectively, the container, a balance pipe (13) is communicated with main chamber (22) and pressure regulating cavity (21), has a display device (12) that main chamber (22) interior liquid level H is converted to flow value at least.
2, according to claim 1, main chamber (22) is provided with a drainage umbrella (9) with the top of balance pipe (13) junction, drainage umbrella (9) constitutes cushion chamber (5) with chamber wall (25), and buffering energy dissipating thing can be set in the cushion chamber (5), forms the slit between the edge of drainage umbrella (9) and the chamber wall (25); One end of an influent stream pipe (3) is connected with drainage umbrella (9), and the other end and last interface (1) are connected, and influent stream pipe (3) side has flow-in hole; One end of a secondary balance pipe (7) is communicated with cushion chamber (5), and the other end is communicated with balance pipe (13).
3, according to claim 1, the display device that main chamber (22) interior liquid level H is converted to flow value can be at least one display tube (12), its upper and lower end is communicated with main chamber (22), display tube (12) can be made with transparent material, scale on its tube wall also can be arranged at least one graduated scale in addition, and also at least one condenser type, electromagnetic type, sound wave type, radiant type, pressure type or other form liquid level-flow is changed display device.
4, according to claim 1, instrument master chamber (22) can be less than the cross-sectional area at other positions, main chamber (22) with the cross-sectional area of lower part corresponding to display device (12) minimum scale line.
5, according to claim 1, connect one between last interface (1) and main chamber (22) and cut down door (2), connect one between lower interface (18) and the pressure regulating cavity (21) and cut down door (19); One is cut down door (23) and connects with main chamber (22); One is cut down door (20) and connects with pressure regulating cavity (21).
6,, extend into the inside, main chamber (22) on the balance pipe (13) with after main chamber (22) are communicated with according to claim 1 always.
7, according to claim 1, pressure regulating cavity (21) can be that transparent material is made.The perhaps liquid level tube (17) of the band scale made from a transparent material, its upper and lower end and pressure regulating cavity (21) are connected.
8,, drainage folliculus foam thing is set in the pressure regulating cavity (21) according to claim 1.
9, according to claim 2, influent stream pipe (3) and drainage umbrella (9) junction are thrown off, the sealing of influent stream pipe (3) lower end, with the secondary dividing plate (8) that has an aperture at least cushion chamber (5) is divided into superposed secondary cushion chamber (5) and is positioned at the secondary chamber (24) of bottom between influent stream pipe (3) lower end and drainage umbrella (9), secondary balance pipe (7) is communicated with secondary chamber (24).
10, according to claim 1, top, main chamber (22) is provided with an influent stream pipe (3), and the upper end of pipe is connected with cutting down door (2), the lower end sealing, and influent stream pipe (3) side has aperture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85106933 CN1016897B (en) | 1985-09-13 | 1985-09-13 | Flow indicator for hulsating liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85106933 CN1016897B (en) | 1985-09-13 | 1985-09-13 | Flow indicator for hulsating liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85106933A true CN85106933A (en) | 1987-04-29 |
| CN1016897B CN1016897B (en) | 1992-06-03 |
Family
ID=4795363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85106933 Expired CN1016897B (en) | 1985-09-13 | 1985-09-13 | Flow indicator for hulsating liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016897B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444818A (en) * | 2015-12-22 | 2016-03-30 | 苏州能斯达电子科技有限公司 | Flexible liquid flow monitoring device |
| CN108957027B (en) * | 2018-04-04 | 2020-09-22 | 中山大学 | Non-contact fluid speed measuring tool and measuring method thereof |
-
1985
- 1985-09-13 CN CN 85106933 patent/CN1016897B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444818A (en) * | 2015-12-22 | 2016-03-30 | 苏州能斯达电子科技有限公司 | Flexible liquid flow monitoring device |
| CN105444818B (en) * | 2015-12-22 | 2019-01-04 | 苏州能斯达电子科技有限公司 | A kind of flexible liquid flow monitoring device |
| CN108957027B (en) * | 2018-04-04 | 2020-09-22 | 中山大学 | Non-contact fluid speed measuring tool and measuring method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1016897B (en) | 1992-06-03 |
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