CN109341791A - A kind of flow measurement device and method - Google Patents
A kind of flow measurement device and method Download PDFInfo
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- CN109341791A CN109341791A CN201811462821.1A CN201811462821A CN109341791A CN 109341791 A CN109341791 A CN 109341791A CN 201811462821 A CN201811462821 A CN 201811462821A CN 109341791 A CN109341791 A CN 109341791A
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- main pipeline
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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
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Abstract
The invention discloses a kind of flow measurement device and methods, it is immersed in when working in liquid medium in main pipeline and the pump being set on main pipeline, the branched pipe that be connected to main pipeline and internal diameter is less than main pipeline is set, branched pipe is connected on the main pipeline wall surface of the delivery outlet of pump, the outlet of branched pipe is connected with the overflow pipe being immersed in liquid medium, flowmeter is provided on overflow pipe, the overflow pipe flow value surveyed according to flowmeter converses the main pipeline flow value in main pipeline.The present invention easily can carry out maintenance replacement to flowmeter, it is not necessary that main pipeline is truncated, can ensure that main pipeline continuously normally conveys, not influence to work normally, and be suitable for pump and main pipeline needs the case where continuing working for a long time.
Description
Technical field
The present invention relates to flow measurement technology field more particularly to a kind of flow measurement device and methods.
Background technique
The usual way that flow measurement is carried out to the liquid medium that conveys in pipeline is series connection and pipe diameter in the duct
Matched flowmeter measures, and common flow is in respect of electromagnetic flowmeter, ultrasonic flowmeter, vortex-shedding meter, differential pressure
Formula flowmeter, turbine meter etc..In the case where pump and pipeline are all fixed and be submerged in liquid medium, series connection is in the duct
Flowmeter installation and dismantling operation it is very inconvenient, when flowmeter, which breaks down, need to perform overhauling and maintenance and replace,
Will first interrupt pipe normal conveying, then could carry out maintenance replacement to flowmeter, therefore, the maintenance and maintenance of flowmeter
It all will affect the normal transport operations of pipeline.It is that will flow under normal conditions since flowmeter is not easy to assemble and disassemble from pipeline
Meter connects in the duct for a long time, but there is long-term the case where persistently carrying out flow monitoring is not needed, only need to be in specific time
Flow measurement is carried out, and flowmeter is still within wear condition within the period for not needing measuring flow, serious curtailment stream
The service life of meter is safeguarded frequent, at high cost.
When carrying out flow measurement to large diameter pipeline (as more than DN500), the flowmeter bore needed is also very big, big mouth
The volume and weight of runoff meter is larger, and price is also high, and the measurement accuracy of heavy caliber flowing meter is also relatively poor, is also easy to
Interference is generated to the flow field of tested pipeline, influences the conveying of medium.
Summary of the invention
The technical problems to be solved by the invention and the technical assignment of proposition are improved to the prior art, and one kind is provided
Flow measurement device, the flow measurement mode in current technology that solves are that inline flow meter, assembly and disassembly maintenance inconvenience fill in the duct
Tear the problem of maintenance meeting interrupt pipe normally conveys open.
In order to solve the above technical problems, the technical scheme is that
A kind of flow measurement device, including the branched pipe being connected to the main pipeline being set in liquid pool, the main pipeline
Upper to be provided with the pump being located in liquid pool, branched pipe is connected on the wall surface of the main pipeline of the delivery outlet close to pump, the branch
Overflow pipe is connected on pipe, the internal diameter of the overflow pipe is less than main pipeline, and flowmeter is provided on overflow pipe, and overflow pipe goes out
Mouth end is provided with overflow port, and branched pipe, overflow pipe, flowmeter and the overflow port is located at below the liquid level of liquid pool.
Flow measurement device setting of the present invention is connected to main pipeline and internal diameter is less than the branched pipe of main pipeline, is pumped in similar work
When being worked in a manner of adjusting revolving speed under condition, the liquid medium that the delivery outlet of pump transfers out is respectively along main pipeline and branched pipe stream
Dynamic conveying flows through the overflow pipe flow value of overflow pipe and flows through when the state of the components such as branched pipe, overflow pipe does not change
The main pipeline flow value of main pipeline is in fixed proportion, to can be converted by the overflow pipe flow value in measurement overflow pipe
Main pipeline flow value out is not necessarily to concatenate bigbore flow corresponding with main pipeline bore on main pipeline using such mode
The access of branched pipe need to be only truncated when the flowmeter being arranged on overflow pipe needs to safeguard replacement in meter, it is not necessary that supervisor is truncated
Road can ensure that main pipeline continuously normally conveys, not influence to work normally, and be suitable for pump and main pipeline needs continue working for a long time
The case where, and the internal diameter of overflow pipe is less than main pipeline, and the bore for the flowmeter installed on overflow pipe is smaller, and cost is relatively
It is low, and the flow field in supervisor will not be interfered.
Further, it is additionally provided with bundled tube rectifier on the overflow pipe, the liquid stream flowed out from branched pipe is adjusted
Smoothly, to improve the measuring accuracy of overflow pipe flow meter.
Further, the overflow pipe is removably attachable on branched pipe, easy to loading and unloading, convenient for portions such as flowmeters
Part is safeguarded, is replaced, and is suitable for only needing to carry out the application scenarios of flow measurement in a few cases, to avoid flowing
Meter is chronically at through-flow state of wear, effectively extends the service life of flowmeter, reduces frequency of maintenance and cost.
Further, the overflow pipe is connected through a screw thread pipe and connect with branched pipe, and structure is simple, is convenient to mount and dismount.Fastly
It is prompt.
Further, the internal diameter of the overflow pipe, branched pipe, screw nipple and bundled tube rectifier is consistent, protects
Hinder the flowing smoothness of the liquid medium flowed along branched pipe, screw nipple, bundled tube rectifier and overflow pipe, improves stream
The accuracy of measurement.
Further, the internal diameter of the overflow pipe be less than or equal to main pipeline internal diameter 1/10th, overflow pipe it is interior
Diameter is small, caused by flow loss in main pipeline it is smaller, ensure the accuracy of medium feed flow in main pipeline.
Further, throttle valve is provided on the branched pipe, it may be convenient to adjust the flow velocity of liquid in overflow pipe
In optimum range, the measurement accuracy of flowmeter is ensured.
Further, the flow is calculated as electromagnetic flowmeter, and measurement accuracy is high, and flowmeter is by protective cover packet
It covers, stability in use is high, long service life, is connected on flowmeter and passes through drawing for protective cover for output flow metrical information
Outlet, monitoring are convenient.
A kind of flow-measuring method is immersed in liquid medium and works in main pipeline and the pump being set on main pipeline
When, the branched pipe that be connected to main pipeline and internal diameter is less than main pipeline is set, and branched pipe is connected to the delivery outlet close to pump
On main pipeline wall surface, the outlet of branched pipe is connected with the overflow pipe being immersed in liquid medium, is provided with flowmeter on overflow pipe,
The overflow pipe flow value surveyed according to flowmeter converses the main pipeline flow value in main pipeline.Flow of the present invention
Measurement method need to only disconnect the connection of branched pipe and overflow pipe i.e. when the flowmeter that is arranged on overflow pipe needs to safeguard replacement
Can, it is not necessary that main pipeline is truncated, it can ensure that main pipeline continuously normally conveys, not influence to work normally, be suitable for pump and main pipeline
Need the case where continuing working for a long time.
Further, the flow rates in the overflow pipe ensure that overflow pipe flow meter measurement de is quasi- in 1~4m/s
True property.
Compared with prior art, the invention has the advantages that:
Flow measurement device of the present invention is not necessarily to concatenate on main pipeline corresponding with main pipeline bore bigbore
Flowmeter need to only disconnect the connection of branched pipe and overflow pipe when the flowmeter being arranged on overflow pipe needs to safeguard replacement,
It is not necessary that main pipeline is truncated, it can ensure that main pipeline continuously normally conveys, not influence to work normally, be suitable for pump and main pipeline needs
The case where continuing working for a long time；
It is convenient to mount and dismount, convenient for being safeguarded, being replaced to components such as flowmeters, suitable for only needing to carry out in a few cases
The application scenarios of flow measurement effectively extend the use of flowmeter so that flowmeter be avoided to be chronically at through-flow state of wear
Service life reduces frequency of maintenance and cost；
The internal diameter of overflow pipe is less than main pipeline, caused by flow loss in main pipeline it is smaller, installed on overflow pipe
The bore of flowmeter is smaller, advantage of lower cost, will not interfere to the flow field in supervisor.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of flow measurement device；
Fig. 2 is that schematic diagram is arranged in the energy spectrometer section of flow measurement device.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
A kind of flow measurement device disclosed by the embodiments of the present invention and method, convenient for being safeguarded, being replaced to flowmeter, dimension
Shield, replacement process will not medium conveying in interrupt pipe, be suitable for pump and pipeline need the case where continuing working for a long time, and
It is convenient to remove when not needing measuring flow, reduces abrasion, long service life.
A kind of flow-measuring method, the pump for being mainly used in main pipeline and being set on main pipeline are all immersed in liquid Jie
The branched pipe that be connected to main pipeline and internal diameter is less than main pipeline is arranged in the scene to work in matter, and branched pipe is connected to close
On the main pipeline wall surface of the delivery outlet of pump, the outlet of branched pipe is connected to be immersed in the overflow pipe in liquid medium, on overflow pipe
Provided with flowmeter, when pump is worked in a manner of adjusting revolving speed under similar operating condition, liquid medium that the delivery outlet of pump transfers out
Respectively along main pipeline and branched pipe flowing conveying, flows through the overflow pipe flow value of overflow pipe and flow through the main pipeline stream of main pipeline
For magnitude in fixed proportion, the overflow pipe flow value surveyed according to flowmeter converses the main pipeline flow in main pipeline
Value.
Flow measurement device based on above-mentioned flow-measuring method such as Fig. 1 mainly includes and is set in liquid pool 1 to shown
The branched pipe that is connected to of main pipeline 4, the pump 2 being located in liquid pool 1 is provided on the main pipeline 4, pump 2 is vertical-type axial-flow pump,
Main pipeline 4 is connect with the delivery outlet of pump 2 by flange 3, and along being vertically arranged in liquid pool 1, branched pipe is connected to be leaned on main pipeline 4
On the wall surface of the main pipeline 4 of the delivery outlet of nearly pump 2, in the present embodiment, branched pipe includes the tee tube 5 connecting with main pipeline 4
With the bend pipe 7 being connected on tee tube 5, the outlet of the bend pipe 7 is additionally provided with throttling on branched pipe towards vertical top
Valve 6, the outlet of the bend pipe 7 of branched pipe are connected to overflow pipe 10, and the internal diameter of the overflow pipe 10 should be much smaller that in main pipeline 4
Diameter reduces liquid medium inflow overflow pipe 10 and loses caused by liquid medium flow rate in main pipeline 4, and the internal diameter of overflow pipe 10 can
To be less than or equal to 1/10th of 4 internal diameter of main pipeline, in the present embodiment, the caliber of main pipeline 4 is DN500, overflow pipe 10
DN40 or DN50 can be used, be provided with flowmeter 11 on overflow pipe 10, the outlet end of overflow pipe 10 is provided with overflow port 14, and
Branched pipe, overflow pipe 10, flowmeter 11 and the overflow port 14 is located at below the liquid level of liquid pool 1, the liquid in overflow pipe 10
Body medium smoothly returns by overflow port 14 and is flowed into liquid pool 1.
In order to improve the accuracy of flow measurement, need to ensure ride comfort when liquid medium flows through flowmeter 11, therefore
Bundled tube rectifier 9 is additionally provided on overflow pipe 10, bundled tube rectifier 9 is located at the inlet side of flowmeter 11, can be effective
Liquid stream is adjusted smooth, for the ease of maintenance, overflow pipe 10 is removably attachable on branched pipe, in the present embodiment, is overflow
Flow tube 10 is connected through a screw thread portion 8 and connect with branched pipe, can easily remove when not needing measuring flow, avoids flowmeter long
Phase is in through-flow state of wear, prolongs the service life, and reduces frequency of maintenance and cost；Interior spiral shell is arranged in the outlet end of branched pipe
External screw thread is arranged in line, the arrival end of overflow pipe 10, and the two, which is connected through a screw thread, constitutes threaded joints 8, overflow pipe 10, tee tube
5, the internal diameter of bend pipe 7, threaded joints 8 and bundled tube rectifier 9 is consistent, ensures along branched pipe, screw nipple, tube bank
The flowing ride comfort of formula rectifier and the liquid medium of overflow pipe flowing, further increases the accuracy of flow measurement.
In the present embodiment, flowmeter 11 is electromagnetic flowmeter, and metering precision is high, and flowmeter 11 is by protective cover 12
Cladding, effective protection flowmeter 11 prolong the service life, and passing through for output flow metrical information is connected on flowmeter 11
The lead-out wire 13 of protective cover 12, measurement are convenient.
As shown in Fig. 2, section where indicating 2 delivery outlets of pump with 0-0 section；1-1 section indicates branched pipe on main pipeline 4
Installation site where section；2-2 section indicates section where the outlet of overflow port 14；The liquid level of 3-3 section expression liquid pool；4-4
Section indicates the section of 2 imports of pump.When energy spectrometer, the reference section of gravitional force is 0-0 section.
By the definition of pump lift H:
Wherein, z0For elevation where 0-0 section；p0For 0-0 section pressure；ρ is fluid density；G is acceleration of gravity；α0
For kinetic energy correction factor, α can use0≈1；v0For the liquid flow velocity of 0-0 section；H is the lift of pump；Remaining subscript is different
Parameter definition is similar.
The liquid flowed out from pump discharge is flowed in main pipeline with flow Q, and wherein small amount of liquids medium flows into branched pipe
In overflow pipe 10, flow q is formed, is flowed into liquid pool 1 using overflow port 14.Establish 0-0 section to 2-2 section Bernoulli Jacob
Energy equation:
In formula, Δ H0-2The energy loss of generation is flowed in overflow pipe for liquid.Very because of section 0-0 and section 1-1 distance
Closely, ignore the energy loss between this two section.ΔH0-2Predominantly liquid branched pipe, throttle valve 6, bundled tube rectifier 9,
The local head loss flowed in the components such as overflow port 14.
Because liquid remains static in liquid pool 1, section 4-4 and section 2-2 are in same static liquid pool, therefore two is disconnected
Face fluid column head having the same, i.e.,
It can be obtained by Formulas I, Formula II and formula III:
H=Δ H0-2 (IV)
Head loss Δ H in above formula0-2, include frictional head loss and local head loss's two parts, because of practical overflow
The length of pipe is smaller, can ignore frictional head loss.Therefore, Δ H0-2It is whole for tee tube 5, bend pipe 7, throttle valve 6, bundled tube
Flow local head loss caused by device 9, overflow port 14 this 5 flow passage components.The wherein part of threaded joints 8 and flowmeter 11
Head loss very little, can be ignored；The local head loss of overflow port 14 contains outlet complementary energy, can obtain:
In formula, ζiFor the local loosening of above-mentioned 5 flow passage components, viIndicate the flow velocity of each flow passage components.According to
The relationship of flow velocity and flow in pipeline:
In formula, diFor the internal diameter of above-mentioned 5 flow passage components, Formula IV, which is brought into Formula V, to be obtained:
This 5 component flow q of tee tube 5, bend pipe 7, throttle valve 6, bundled tube rectifier 9, overflow port 14iIt is equal to flow
Q, then
Wherein:
It can be obtained by formula IV, Formula VIII
H=K1q2 (X)
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 the 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 XI and Formula XII it is found that the operation curve of pump is similar parabola, meet relationship:
H=K0Q2 (XIII)
Wherein K0=1/ (H0×Q0 2), for the characterisitic parameter of pump, from Formula X and Formula XIII
Q=Kq (XIV)
Wherein:
K is referred to as overflow pipe discharge coefficient, establishes flow Q and flow q in overflow pipe in main pipeline by Formula XIV and Formula XV
Between relationship flowed through when pump is run in a manner of adjusting revolving speed and flow resistance characteristics in main pipeline do not change
The overflow pipe flow value of overflow pipe and the main pipeline flow value for flowing through main pipeline are surveyed in fixed proportion according to flowmeter
To overflow pipe flow value converse the main pipeline flow value in main pipeline.
When measuring the flow of main pipeline using flow measurement device described in above-described embodiment, first have to determine that pump is being responsible for
The characterisitic parameter K pumped when being run under the drag characteristic in road0Value, it is also necessary to determine local resistance system of the throttle valve under different opening
Several and tee tube 5, bend pipe 7, bundled tube rectifier 9, overflow port 14 coefficient of partial resistance, then can be at throttle valve
When under some aperture, K is calculated with Formula IX1Value, then just can obtain overflow pipe flow coefficient k value, Ji Ketong with Formula XV
The flow q that the measurement of flowmeter 11 crossed on overflow pipe 10 obtains converses the flow Q in main pipeline 4.
When the flow measurement device stated in use, can directly measure main pipeline flow Q come flow measurement device into
Row verification, it is ensured that the flow velocity in overflow pipe 10 is in optimum range, to ensure the flow Q value obtained by above-mentioned conversion process
Accuracy, the suitable flow rate range in overflow pipe 10 accurately measures in 1~4m/s convenient for the flowmeter 11 on overflow pipe 10,
If it is larger to calculate the flow rates deviation obtained, the aperture of throttle valve 6 is readjusted, finally becomes the flow velocity of overflow pipe 10
Change range in the measurement range of flowmeter 11；Pump should be worked in a manner of adjusting revolving speed under similar operating condition, when pump is extremely low
When being run under revolving speed or under the operating condition of super design speed, the characterisitic parameter K of pump0Value can change, and measurement error can become larger；?
In long-term use process, the aperture of throttle valve 6 should be kept fixed, and otherwise overflow pipe flow coefficient k value need to recalculate；Not
When needing measuring flow, threaded joints 8 are disconnected, so as to take out the components such as overflow pipe 10 out of liquid pool 1, avoid flow
Meter is chronically at the state of wear of circulation, prolongs the service life.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, protection scope of the present invention should be defined by the scope defined by the claims..For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (10)
1. a kind of flow measurement device, which is characterized in that described including the branched pipe being connected to the main pipeline being set in liquid pool
Main pipeline on be provided be located at liquid pool in pump, branched pipe be connected to close to pump delivery outlet main pipeline wall surface on, institute
Overflow pipe is connected on the branched pipe stated, the internal diameter of the overflow pipe is less than main pipeline, is provided with flowmeter on overflow pipe, overflows
The outlet end of flow tube is provided with overflow port, and branched pipe, overflow pipe, flowmeter and the overflow port is located at the liquid of liquid pool
Below face.
2. flow measurement device according to claim 1, which is characterized in that be additionally provided with bundled tube on the overflow pipe
Rectifier.
3. flow measurement device according to claim 2, which is characterized in that the overflow pipe is removably attachable to point
On branch pipe.
4. flow measurement device according to claim 3, which is characterized in that the overflow pipe be connected through a screw thread portion with
Branched pipe connection.
5. flow measurement device according to claim 4, which is characterized in that the overflow pipe, branched pipe, threaded connection
The internal diameter of portion and bundled tube rectifier is consistent.
6. flow measurement device according to claim 1, which is characterized in that the internal diameter of the overflow pipe is less than or equal to
/ 10th of main pipeline internal diameter.
7. flow measurement device according to claim 1, which is characterized in that be provided with throttle valve on the branched pipe.
8. flow measurement device according to claim 1, which is characterized in that the flow is calculated as electromagnetic flowmeter, and
And flowmeter is coated by protective cover, and the lead-out wire across protective cover for output flow metrical information is connected on flowmeter.
9. a kind of flow-measuring method, which is characterized in that be immersed in liquid in main pipeline and the pump being set on main pipeline and be situated between
When working in matter, the branched pipe that be connected to main pipeline and internal diameter is less than main pipeline is set, branched pipe is connected to close to pump
On the main pipeline wall surface of delivery outlet, the outlet of branched pipe is connected with the overflow pipe being immersed in liquid medium, is arranged on overflow pipe
Flowmeter, the overflow pipe flow value surveyed according to flowmeter converse the main pipeline flow value in main pipeline.
10. flow-measuring method according to claim 9, which is characterized in that the flow rates in the overflow pipe are 1
~4m/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811462821.1A CN109341791B (en) | 2018-12-03 | 2018-12-03 | Flow measuring device and method |
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| CN201811462821.1A CN109341791B (en) | 2018-12-03 | 2018-12-03 | Flow measuring device and method |
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| CN109341791B CN109341791B (en) | 2020-10-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111188604A (en) * | 2020-03-24 | 2020-05-22 | 莱西市鑫喆工程技术服务中心 | Petroleum water distributor |
| CN112945326A (en) * | 2021-02-23 | 2021-06-11 | 吉林大学 | Gas flow measuring device and method |
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| CN109341791B (en) | 2020-10-02 |
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