CN108917861A - The shunt valve flow measurement device and measurement method of heavy caliber speed governing operation pump - Google Patents
The shunt valve flow measurement device and measurement method of heavy caliber speed governing operation pump Download PDFInfo
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- CN108917861A CN108917861A CN201810826151.0A CN201810826151A CN108917861A CN 108917861 A CN108917861 A CN 108917861A CN 201810826151 A CN201810826151 A CN 201810826151A CN 108917861 A CN108917861 A CN 108917861A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses the shunt valve flow measurement devices and measurement method of a kind of heavy caliber speed governing operation pump, including shunt valve, shunt valve entrance is provided with throttle valve, and rectification beam and flowmeter are additionally provided on shunt valve, and rectification beam is arranged between flowmeter and throttle valve.Flow-measuring method is：The flow q in shunt valve is measured using the flow measurement on shunt valve first, the flow Q in main pipeline is then calculated according to formula Q=Kq.Inventive flow measuring device, valve opening is not adjusted suitable for main pipeline, and main pipeline drag characteristic is constant, and pump in the way of adjusting revolving speed under similar operating condition operation in the case where.It is not limited by pump and main pipeline bore, and manufacturing cost and use cost and the bore of pump and main pipeline are not related, when being applied to Application of Large-diameter Pump and pipeline, can greatly reduce cost；Apparatus of the present invention have little effect the flowing in main pipeline, do not have the pressure loss；Principle and structure are simple, and operation and maintenance is very convenient.
Description
Technical field
The present invention relates to a kind of flow measurement devices, specifically, being related to a kind of shunt valve of heavy caliber speed governing operation pump
Flow measurement device and measurement method.
Background technique
Flow measurement is in metallurgy, electric power, coal, chemical industry, petroleum, traffic, building, light textile, food, medicine, agricultural, environment
There is very important effect in the industries such as protection.Flowmeter type currently used for direct measuring flow is more, mainly there is electricity
Magnetic flowmeter, ultrasonic flowmeter, vortex-shedding meter, differential pressure flowmeter, turbine meter, volumetric flowmeter, float
Formula flowmeter etc..When these flowmeters are directly used in Application of Large-diameter Pump and pipeline (such as bore is more than 800mm) flow measurement, exist
Respective limitation.If flowmeter volume and weight are larger, cost is higher；Heavy caliber flowing meter calibration is difficult, calibration cost
It is high；Heavy caliber flowing meter is limited by use condition, and there are various problems for installation and maintenance；Partial discharge meter is to tested
There is interference in the flow field of pipeline, causes crushing.
Summary of the invention
In view of this, existing defects when the present invention is measured for existing Conventional meters for Application of Large-diameter Pump and pipeline flow
The problem of, provide the shunt valve flow measurement device and flow-measuring method of a kind of heavy caliber speed governing operation pump.
In order to solve the above-mentioned technical problem, the invention discloses a kind of shunt valve flow measurements of heavy caliber speed governing operation pump
Device, including shunt valve, shunt valve entrance are provided with throttle valve, and rectification beam and flowmeter, rectification are additionally provided on shunt valve
Beam is arranged between flowmeter and throttle valve.
Further, flow is calculated as electromagnetic flowmeter or ultrasonic flowmeter or vortex-shedding meter or differential pressure flowmeter.
The invention discloses a kind of flow-measuring method of Application of Large-diameter Pump, used in shunt valve flow measurement device knot
Structure is：Including shunt valve, shunt valve entrance is provided with throttle valve, and rectification beam and flowmeter, rectification are additionally provided on shunt valve
Beam is arranged between flowmeter and throttle valve；
Specifically measurement method is：The flow q in shunt valve is measured using the flow measurement on shunt valve first, then basis
Following formula calculates the flow Q in large diameter pipeline,
Q=Kq
Wherein K is by-pass factor.
Further, by-pass factorWherein K0For the characterisitic parameter of pump, K1For pump discharge on main pipeline
To the function of geomery and waterhead fall between shunt valve installation place, when shunt valve installation site and pump discharge position
K when closer1It ignores, K2For the geomery of each flow passage components of shunt valve and the function of waterhead fall.
Further,It is wherein the frictional resistant coefficient that λ is shunt valve, l is bypass
Pipe total length, d are bypass pipe diameter；ζjFor 5 flow passage components on shunt valve, i.e., import, bend pipe, rectification beam, flowmeter and go out
The coefficient of partial resistance of mouth, djFor the equivalent diameter of above-mentioned 5 flow passage components.
Further, the different aperture of throttle valve corresponds to different by-pass factor K values.It can be by adjusting in shunt valve
The aperture of throttle valve, to adjust the size of by-pass factor K value.
Further, when if desired by-pass factor K value is constant, by adjusting the opening size of throttle valve, so that bypass
The Reynolds number of liquid flowing in pipe meets Re >=1.5 × 105。
Compared with prior art, the present invention can be obtained including following technical effect：
1) the flow measurement device of the invention valve opening suitable for main pipeline is not adjusted, and main pipeline drag characteristic is not
Become, and pump in the way of adjusting revolving speed under similar operating condition operation in the case where.
2) flow measurement device of the invention is not limited by pump and main pipeline size, the manufacture of flow measurement device and is made
Bore with cost and pump and pipeline is not related, therefore when applied to Application of Large-diameter Pump and pipeline, can greatly reduce cost.
3) inventive flow measuring device is in industrial production, in the case that flowmeter cannot be directly installed on pipeline
Also it is applicable in very much.
4) inventive flow measuring device has little effect the flowing in main pipeline, does not have the pressure loss.
5) principle of inventive flow measuring device and structure are all very simple, and operation and maintenance is all very convenient.
6) when the aperture for adjusting throttle valve on shunt valve, so that the fluid flowing in shunt valve meets Re >=1.5 × 105
When, by-pass factor K is a fixed constant, and flow Q is linear in flow q and main pipeline in shunt valve, convenience of calculation.
Certainly, it implements any of the products of the present invention it is not absolutely required to while reaching all the above technical effect.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes a part of the invention, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the shunt valve flow measurement device structural schematic diagram of heavy caliber speed governing operation pump of the present invention.
In figure, 1-liquid pool, 2-pump inlet flanges, 3-pumps, 4-pump discharge flanges, 5-main pipelines, 6-throttle valves,
7-rectification beams, 8-shunt valves, 9-flowmeters.
Specific embodiment
Carry out the embodiment that the present invention will be described in detail below in conjunction with embodiment, thereby to the present invention how application technology hand
Section solves technical problem and reaches the realization process of technical effect to fully understand and implement.
The arrangement for the shunt valve flow measurement device that speed governing operation pumps in large diameter pipeline of the present invention is as shown in Figure 1.Liquid pool 1
Inside there is liquid medium to be conveyed.Pump 3 pumps to liquid in heavy caliber main pipeline 5, and 2 be the suction flange of pump, and 4 be going out for pump
Mouth flange.It is Q that pumping, which is sent to the fluid flow in main pipeline 5,.It is close on main pipeline to pump out for the size of measuring flow Q
Mouth flange opens an aperture, and connects upper shunt valve 8.Liquid has sub-fraction by opened aperture in main pipeline, into side
In road pipe 8, flow q is formed in shunt valve.Shunt valve import is nearby provided with throttle valve 6, flow q can be adjusted control
System.Flowmeter 9 is set on shunt valve, for measuring the size of the flow q in shunt valve.Rectification beam is provided on shunt valve
7 and between throttle valve 6 and flowmeter 9, the purpose is to keep the flowing of the measuring section liquid of flowmeter 9 in shunt valve smooth.It is other
Fluid in road pipe 8 finally flows back into liquid pool 1.
Shunt valve flow measurement device is collectively constituted by throttle valve 6, rectification beam 7, shunt valve 8, flowmeter 9, the device
Effect be measure main pipeline 5 in flow Q size.Shunt valve flow measurement device when in use, is measured by flowmeter 9
The size of flow q in shunt valve obtains the flow Q in main pipeline by converting.
Bypass conduit dimensions very little for main pipeline, measurement q are easier to, required 9 bore very little of flowmeter, at
This is lower.Flowmeter 9 can be but not limited to using conventional electromagnetic flowmeter, or ultrasonic flowmeter, vortex street stream
Meter, differential pressure flowmeter.Shunt valve flow measurement device of the present invention also has little effect the liquid flowing of main pipeline, no
It will cause the additional pressure loss.The flow measurement device will cause flow loss a small amount of in main pipeline, can pass through throttle valve 6
Control is adjusted to the flow entered in shunt valve, structure is simple, easy to use.
The working principle of the shunt valve flow measurement device of heavy caliber speed governing operation pump of the present invention：
As shown in Figure 1, with E0、E1、E2And E3Come respectively indicate in liquid pool, pump inlet section 1-1, pump discharge section 2-2,
Shunt valve installs the energy (i.e. head is indicated with m) of the Unit Weight liquid of section 3-3.Pump lift H refers to liquid from pump inlet place
Energy to exit Unit Weight liquid rises in value, i.e.,：
E2-E1=H (1)
From the liquid energy equation of section 0-0 and 1-1：
E0-E1=Δ h0-1 (2)
Δ h in formula0-1For liquid pool to the head loss of pump inlet section.From the liquid energy equation of 2-2 and 3-3：
E2-E3=Δ h2-3 (3)
Δ h in formula2-3The head loss of section is installed for pump discharge to shunt valve.From formula (1), (2), (3)：
E3-E0=H- Δ h0-1-Δh2-3 (4)
Liquid is flowed into from shunt valve import, is flowed through shunt valve and is flowed into liquid pool.By the energy side between 3-3 section and liquid pool
Cheng Kezhi：
E3-E0=Δ h3-0 (5)
In formula, Δ h3-0The head loss for flowing generation in shunt valve for liquid is contained from when shunt valve outlet outflow
Remaining kinetic energy.Then from formula (4) and formula (5)
H=Δ h0-1+Δh2-3+Δh3-0 (6)
Head loss Δ h in above-mentioned formula (2)-(6), comprising frictional head loss and local head loss's two parts, i.e.,
In formula, n indicates the pipeline section number that linear loss is calculated in pipeline, λiFor each section of loss factor, liIt is each section
Length, diFor each section of diameter, ViFor liquid flow velocity in each section, g is acceleration of gravity；M indicates to calculate local water in pipeline
The flow passage number of packages of head loss, ζjFor the coefficient of partial resistance of each component, VjFor liquid flow velocity in each component.According to pipeline
The relationship of interior flow velocity and flow：
Wherein, Q is flow, and A is cross-sectional area.Formula (8), which is brought into formula (7), to be obtained：
Because in main pipeline, the flow of pipeline is the flow Q of pump at each section, then
Wherein：
It can similarly obtain：
Wherein：
For the shunt valve in the present invention, because its length is smaller, one section can be looked at for entire shunt valve by calculating linear loss
To calculate；That causes local head loss mainly has 5 flow passage components, i.e. import, bend pipe, rectification beam, flowmeter and outlet.Cause
This, formula (13) can be changed to
It is wherein the frictional resistant coefficient that λ is shunt valve, l is shunt valve total length, and d is bypass pipe diameter；ζjFor bypass
Manage 5 flow passage components, i.e. import, bend pipe, the coefficient of partial resistance for rectifying beam, flowmeter and outlet, djFor above-mentioned 5 overcurrents
The equivalent diameter of component.
It can be obtained by formula (6), (10) and (12)：
H=K1Q2+K2q2 (15)
On the other hand, the operating condition of pump is analyzed.When valve opening is not adjusted in main pipeline, resistance of ducting characteristic is constant,
And pump meets relationship when running under conditions of similar operating condition in the way of adjusting revolving speed：
Wherein Q, H and n are respectively flow, lift and the revolving speed pumped under any operating condition；Q0、H0And n0Respectively pump specified work
Flow, lift and revolving speed under condition.By formula (16) and formula (17) it is found that the operation curve of pump is similar parabola, meet relationship：
H=K0Q2 (18)
Wherein, K0For the characterisitic parameter of pump.
From formula (15) and formula (18)
Q=Kq (19)
Wherein：
K is known as by-pass factor.
By formula (19) it is found that using the flowmeter 9 being arranged on shunt valve, after measuring the flow q in shunt valve, multiplied by side
Flow Q in road COEFFICIENT K you can get it main pipeline.
About the size and calculation method of by-pass factor K, bypass is influenced it can be seen from derivation and analytic process before
Values of factor K size because being known as：
(1) the characterisitic parameter K pumped0Size.
(2) on main pipeline, from liquid pool 1 to pump inlet flange 2, pump discharge flange 4 to shunt valve installation section 3-3
Head loss size, available parameter K1To indicate.K1For the geomery of main pipeline and the function of waterhead fall.
(3) on shunt valve, the head loss size generated between outlet from shunt valve import to shunt valve, available parameter K2
To indicate.K2For the geomery of each flow passage components of shunt valve and the function of waterhead fall.
Liquid pool 1 to the duct length very little between pump inlet flange 2, caused by head loss can be ignored.If
When shunt valve installation site is closer from the outlet of pump, the influence of factor (2) is very small, K1It can be ignored.Influence bypass system
The characterisitic parameter K of the mainly pump of number K value size0With the parameter K of shunt valve2。
Show to work as guarantee by numerical simulation calculating and experimental test：Pump speed governing operation under similar operating condition；Shunt valve
Geomery does not change；The size of shunt valve is rationally designed, the aperture of throttle valve 6 is adjusted, so that the liquid in shunt valve
The Reynolds number of flowing meets Re >=1.5 × 105When, by-pass factor K is constant, be that is to say in shunt valve in flow q and main pipeline
Flow Q is linear.
It is specific as follows using the flow-measuring method of shunt valve flow measurement device of the present invention：
1. using the characteristic curve of pump, or utilizing research technique, obtain pumping under main pipeline drag characteristic, adjusts revolving speed
Characterisitic parameter K when mode is run0Value.
2. with theoretical calculation or searching relevant fluid resistance handbook or number according to the shape and size parameter of shunt valve
The methods of value emulation or test, obtain the waterhead fall of each flow passage components in shunt valve 8.By dimension data and head loss
Coefficient is brought into formula (14), calculates K2Value.
3. by K0Value and K2Value is brought into formula (20), and K is ignored1, by-pass factor K value is calculated, so that it is determined that shunt valve 8
The relationship of flow Q in middle flow q and main pipeline.
4. measuring the flow q in shunt valve with the flowmeter 9 on shunt valve 8.
5. calculating the flow Q in main pipeline using formula (19).
6. can be by adjusting the aperture of the throttle valve 6 in shunt valve, to adjust the size of by-pass factor K value.When in use,
Coefficient of partial resistance of the throttle valve under different opening can be searched, calculates the size of by-pass factor K value according to the method described above.
7. if desired by-pass factor K value is constant, it can be made in shunt valve by the opening size of adjusting throttle valve 6
The Reynolds number of liquid flowing meets Re >=1.5 × 105。
Above description has shown and described several preferred embodiments of invention, but as previously described, it should be understood that invention is not
It is confined to form disclosed herein, should not be regarded as an exclusion of other examples, and can be used for various other combinations, modification
And environment, and can be carried out within that scope of the inventive concept describe herein by the above teachings or related fields of technology or knowledge
Change.And changes and modifications made by those skilled in the art do not depart from the spirit and scope of invention, then it all should be in the appended power of invention
In the protection scope that benefit requires.
Claims (7)
1. a kind of shunt valve flow measurement device of heavy caliber speed governing operation pump, which is characterized in that including shunt valve, the bypass
Pipe entrance is provided with throttle valve, and rectification beam and flowmeter are additionally provided on the shunt valve, and the rectification beam is arranged described
Between flowmeter and the throttle valve.
2. shunt valve flow measurement device as described in claim 1, which is characterized in that flow is calculated as electromagnetic flowmeter or ultrasound
Wave flowmeter or vortex-shedding meter or differential pressure flowmeter.
3. a kind of shunt valve flow-measuring method of heavy caliber speed governing operation pump, which is characterized in that shunt valve stream used in it
Measuring device structure is：Including shunt valve, the shunt valve entrance is provided with throttle valve, is additionally provided on the shunt valve
Beam and flowmeter are rectified, the rectification beam is arranged between the flowmeter and the throttle valve；
Specifically measurement method is：The flow q in shunt valve is measured using the flow measurement on shunt valve first, then according to as follows
Formula calculates the flow Q in heavy caliber main pipeline,
Q=Kq
Wherein K is by-pass factor.
4. flow-measuring method as claimed in claim 3, which is characterized in that the by-pass factorWherein
K0For the characterisitic parameter of pump, K1For pump discharge on main pipeline to the geomery and waterhead fall between shunt valve installation place
Function, the K when shunt valve installation site and closer pump discharge position1It ignores, K2For the shape of each flow passage components of shunt valve
The function of size and waterhead fall.
5. flow-measuring method as claimed in claim 4, which is characterized in thatIt is wherein λ
For the frictional resistant coefficient of shunt valve, l is shunt valve total length, and d is bypass pipe diameter；ζjFor 5 flow passage components on shunt valve,
That is import, bend pipe, the coefficient of partial resistance for rectifying beam, flowmeter and outlet, djFor the equivalent diameter of above-mentioned 5 flow passage components.
6. such as the described in any item flow-measuring methods of claim 3-5, which is characterized in that the different aperture of throttle valve, it is corresponding
Different by-pass factor K values, can be by adjusting the aperture of throttle valve in shunt valve, to adjust the size of by-pass factor K value.
7. such as the described in any item flow-measuring methods of claim 3-5, which is characterized in that if desired by-pass factor K value is normal
When number, by adjusting the opening size of throttle valve, so that the Reynolds number that the liquid in shunt valve flows meets Re >=1.5 × 105。
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| CN201810826151.0A CN108917861A (en) | 2018-07-25 | 2018-07-25 | The shunt valve flow measurement device and measurement method of heavy caliber speed governing operation pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810826151.0A CN108917861A (en) | 2018-07-25 | 2018-07-25 | The shunt valve flow measurement device and measurement method of heavy caliber speed governing operation pump |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109341791A (en) * | 2018-12-03 | 2019-02-15 | 西华大学 | A kind of flow measurement device and method |
| CN111412957A (en) * | 2020-03-27 | 2020-07-14 | 天津大学 | Vortex street signal detection method based on acceleration measurement |
| CN111412956A (en) * | 2020-03-27 | 2020-07-14 | 天津大学 | Vortex street probe based on acceleration measurement |
| CN113970365A (en) * | 2021-10-29 | 2022-01-25 | 华能重庆两江燃机发电有限责任公司 | Large-pipe-diameter large-flow-measurement system and method |
| CN115144044A (en) * | 2022-05-31 | 2022-10-04 | 重庆川仪自动化股份有限公司 | Shut off formula of decontaminating's Parshall groove and sewage measurement simulation experiment device |
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| CN109341791A (en) * | 2018-12-03 | 2019-02-15 | 西华大学 | A kind of flow measurement device and method |
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Application publication date: 20181130 |