CN105841756A - Pressure difference flow detection head and application thereof - Google Patents
Pressure difference flow detection head and application thereof Download PDFInfo
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- CN105841756A CN105841756A CN201610158318.1A CN201610158318A CN105841756A CN 105841756 A CN105841756 A CN 105841756A CN 201610158318 A CN201610158318 A CN 201610158318A CN 105841756 A CN105841756 A CN 105841756A
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- pressure
- differential
- circular arc
- low
- detecting head
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Classifications
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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
- G01F1/05—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
- G01F1/36—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 the pressure or differential pressure being created by the use of flow constriction
-
- 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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention belongs to the pipeline fluid detection technical field, and specifically refers to a pressure difference flow detection head and application thereof; the pressure difference flow detection head is a segment of hollow space body, wherein the cross section is in a badminton shape, i.e., the middle portion refers to two side edges of an isosceles trapezoid, the front portion refers to an arc with two tangent edges, the rear portion refers to an arc connecting the two edges, and the two side edges and two arcs form the space body; an isolation arc is also arranged in the enclosed space so as to divide the space into the front zone and the rear zone; the front zone is a high pressure zone, the rear zone is a low pressure zone; the two side surfaces are provided with a plurality of low pressure ports; the center of the front arc surface of the detection head is provided with a plurality of high pressure ports; the ports are used for collecting flow data. The pressure difference flow detection head is applied to a pressure difference flow detection device so as to form a novel pressure difference flow detector; the pressure difference flow detection head is simple in structure, low in making cost, strong in anti-blocking ability, and high in measuring precision.
Description
Technical field
The invention belongs to pipeline fluid Detection Techniques field, be specifically related to a kind of differential flow detecting head and application thereof.
Background technology
Pipeline is widely used in the industrial production, can be used for transmitting all kinds of gas, liquid and steam at interior fluid.And
And, also it is required for transmitting all kinds of fluid with pipeline in the several scenes such as heating, fuel feeding, supply.In above-mentioned application scenarios,
It is frequently necessary to the flow information of fluids within pipes is measured, the most normal to determine the flowing of fluids within pipes.
In the prior art, it is typically chosen special meter bore flowmeter to measure.
The ultimate principle of orifice flowmeter:
Being full of the fluid of pipeline, when throttling element in it flows through pipeline, flow velocity will form local contraction at throttling element, thus
Flow velocity increases, and static pressure reduces, and then just creates pressure reduction before and after throttling element, and fluid flow is bigger, and the pressure reduction of generation is bigger,
The size of flow so can be weighed according to pressure reduction.This measuring method be flow equation of continuity (mass conservation law) and
Based on Bernoulli equation (law of conservation of energy).Pressure extent is not only also relevant with other many factors with flow, example
As when the physical property (density, viscosity) of throttling arrangement form or fluids within pipes is different, produced under an equal amount of flow
Raw pressure reduction is also different.
Although orifice flowmeter can sense when the flow information of fluid, but, the range ratio of orifice plate is little (5:1), to directly
Pipeline section to be rectificated >=15D, and the pressure loss is big, and mounting cost is high, and long-term accuracy is low, causes client's energy waste serious, installs
The highest with the cost safeguarded.
And utilizing differential pressure principle to carry out flow measurement is one of most reliable flow measurement mode in the world today, the whole world has
Flow measurement more than 50% uses differential pressure technology.The reliability of its performance, obtains the accreditation of users.Representative products hole
Plate has long history, people to its installation, use and overhaul the most very familiar.
General Flow Measuring System is by secondaries such as throttling arrangement (differential pressure producer), differential pressure transmitter and flow integrators
Instrument forms.
Along with advancing by leaps and bounds of electronic technology, the precision of the secondary meter such as transmitter, integrating instrument, sensitivity there occurs matter
Change, has reached high level, but, the detection level of a secondary source does not has important breakthrough all the time in decades, has become restriction
The bottleneck of differential pressure system for flow measurement development so that high-caliber downstream instrument cannot give play to due high efficiency.
Summary of the invention
It is an object of the invention to provide the differential flow detection that a kind of range ratio is big, the pressure loss is little, installation cost is low
Head.
Differential flow detecting head provided by the present invention, it is the body of one section of hollow, and probe is longitudinally a strip, visits
Head cross section is feather ball-type, i.e. middle part is two side a of an isosceles trapezoid, and anterior (shuttlecock head) is at isosceles ladder
The anterior circular arc b that in shape, position, base is connected with trapezoidal two limits, rear portion (shuttlecock afterbody) is in isosceles trapezoid bottom
The rear portion circular arc c that position is connected with trapezoidal two limits, two side a, two circular arcs b, c enclose a space body；Enclose at this
In conjunction space, being additionally provided with a separation circular arc d, enclosed space is separated into former and later two regions, forefoot area is higher-pressure region 1, back zone
Territory is low-pressure area 2；As shown in Figure 1；
On dual-side a pipe face, it is positioned at the mid-area location of low-pressure area 2, is provided with some low pressure along probe length direction and takes
Pressure hole 3；In the anterior center, circular arc b pipe face of probe, it is provided with some high pressure pressure ports 4 along probe length direction；Such as Fig. 2 institute
Show.During use, these osseotomy site are totally submerged in the duct, are used for collecting data on flows.
The differential flow detecting head of the present invention can be used for, in a kind of differential flow detection device, forming a kind of new differential pressure stream
Amount detector.
Present invention additionally comprises a kind of differential flow detection device, comprise an above-mentioned differential flow detecting head, a difference
Pressure transmitter and one are for being converted into receivable turn of differential pressure transmitter by differential flow detecting head higher-pressure region 1 and low-pressure area 2
Connection device；Described differential flow detecting head is as measuring cell, and measurement flow in pipeline is stretched in its lower end, and upper end is filled by switching
Put same differential pressure transmitter to connect；
Described switching device is the pipeline communicated up and down, and its lower end is connected with differential flow detecting head upper end, its upper end and differential pressure
Transmitter connects；Wherein, the switching device lower end mouth of pipe matches with differential flow detecting head higher-pressure region 1 and low-pressure area 2, switching dress
The high and low pressure receiving port putting the upper end mouth of pipe and differential pressure transmitter matches.
In the present invention, differential flow detecting head, the flange phase that differential pressure transmitter and switching device are all arranged by seam
Connect.
In the present invention, simple in construction, low cost of manufacture, use in the differential flow detection device of this detecting head, as one
The differential flow detecting head of secondary measuring cell and differential pressure transmitter being combined into one in maker as secondary meter, carry
For complete flow measurement solution.The present invention improves flowmeter accuracy, (does not has leak point hidden without regular maintenance simultaneously
Suffer from).User need not add any connector, pipeline, valve, adapter, valve group and mounting bracket.In-site installation is the fastest
Victory, saves set-up time and expense.
Accompanying drawing explanation
Fig. 1 is the differential flow detecting head sectional view of the present invention.
Fig. 2 is the differential flow detecting head overall schematic of the present invention.
Fig. 3 is the structural representation of differential flow detection device.
Fig. 4 is the fundamental diagram of differential flow detection device.
Fig. 5 is that the differential flow detecting head of the present invention uses state diagram.
Fig. 6 is the existing differential flow detecting head cross section diagram of table 1.Wherein, a is diamond, and b is circular.
Label in figure: a is side, and b is anterior circular arc, and c is rear portion circular arc, and d is for separating circular arc, and 1 is higher-pressure region, and 2 is low
Nip, 3 is low pressure pressure port, and 4 is high pressure pressure port.
Detailed description of the invention
Embodiment:
The present invention is the tubular probe of one section of hollow, uses the section bar of 316L to make, and the cross section of probe is feather ball-type, i.e. middle part
Being two side a of an isosceles trapezoid, anterior (shuttlecock head) is position, base and trapezoidal two limits in isosceles trapezoid
The anterior circular arc b being connected, rear portion (shuttlecock afterbody) is the rear portion circular arc c on connection both sides, position, isosceles trapezoid bottom,
Both sides two arc constitutes an enclosed space；In the enclosed space in this cross section, it is additionally provided with a separation circular arc d, enclosed space is separated
Becoming former and later two regions, forefoot area is higher-pressure region 1, and rear region is low-pressure area 2；As shown in Figure 1；
The lower end area of described probe, on the dual-side a pipe face of probe being positioned at low-pressure area 2, and along probe length direction
It is provided with some low pressure pressure ports 3；In the center, anterior circular arc b pipe face of the probe being positioned at higher-pressure region 1, along probe length side
To being provided with some high pressure pressure ports 4；As shown in Figure 2.
The osseotomy site of described probe lower end is totally submerged in the duct, is used for collecting data on flows.
In the present invention, a length of the 14 ~ 45 of side a, the front end spacing of dual-side a is 12 ~ 36, between the rear end of dual-side a
Away from for 15 ~ 45, and front end is smaller than rear end spacing；The radius of anterior circular arc b is 7 ~ 21, the radius of rear portion circular arc c is 10 ~
30, the radius separating circular arc d is 16 ~ 48, and separating circular arc d with anterior circular arc b top margin spacing is 12 ~ 36.Low pressure on dual-side a
A diameter of the 2 ~ 4 of pressure port 3, a diameter of 3 ~ 5 of the high pressure pressure port 4 on anterior circular arc b, and the diameter of low pressure pressure port 3 is little
Diameter in high pressure pressure port 4.Unit is mm.
In the present invention, the quantity of pressure hole perforate 4 is 2 ~ 16, low pressure hole the number of openings be 2 right ~ 16 to (dual-side
The most corresponding upper hole be 1 to), the size with specific reference to pipeline determines.The size of pipe diameter is generally 20mm to 6000mm.
The cross section structure of one typical differential flow detecting head is as follows: a length of the 15 of side a, the front end of dual-side a
Spacing is 12, and the rear end spacing of dual-side a is 15；The radius of anterior circular arc b is 7, and the radius of rear portion circular arc c is 10, separates circle
The radius of arc d is 16, and separating circular arc d with anterior circular arc b top margin spacing is 12；Low pressure pressure port 3 on dual-side a a diameter of
2, quantity is 8 right, and a diameter of 3 of the high pressure pressure port 4 on anterior circular arc b, quantity is 8, and the wall thickness of each several part is 2.Unit
It is mm.
Present invention additionally comprises a kind of differential flow detection device, it comprises an above-mentioned differential flow detecting head, one
Differential pressure transmitter and one for being converted into receivable turn of differential pressure transmitter by differential flow detecting head higher-pressure region and low-pressure area
Connection device.
In the present invention, described differential flow detecting head is as measuring cell, and measurement flow, upper end in pipeline are stretched in its lower end
Connected with differential pressure transmitter by switching device；
Described switching device is the pipeline communicated up and down, and its lower end is connected with differential flow detecting head upper end, its upper end and differential pressure
Transmitter connects；Wherein, the switching device lower end mouth of pipe matches with differential flow detecting head higher-pressure region and low-pressure area, switching device
The upper end mouth of pipe matches with the high and low pressure receiving port of differential pressure transmitter.
In the present invention, differential flow detecting head, the flange phase that differential pressure transmitter and switching device are all arranged by seam
Connect.The brand and model of the existing routine in market selected by differential pressure transmitter, such as the EJA110A of Chuan Yi company.
In the present invention, this differential flow detection device belongs to pitot tube folwmeter, it is also possible to referred to as even speed tube flow
Meter.Differential pressure value that fluids within pipes formed in block body upstream and downstream that what it was measured is, then utilizes fluid flow and differential pressure value
Between conversion relation draw flow value.
As shown in Figure 4, it is mainly used in measuring gas, liquid and the steam volume in pipeline and mass flow, is suitable for
The gas of full packages one-way flow, liquid and steam flow between measurement caliber is at 20mm to 6000mm.
In the present invention, this differential flow detection device is mainly used in the company of various gases, liquid and steam in industrial process
Afterflow rate is measured, and has the highest certainty of measurement (± 1%) and good reproducibility (0.1%).Through demarcating, precision is up to 0.5%.
Comparing with other form effusion meter, the signal stabilization that the present invention produces is reliable, keeps long-term high accuracy, with traditional orifice plate, spray
The differential pressure flowmeters such as mouth are compared, and differential pressure flowmeter is installed simpler, only need little time.In running, pipeline is produced
Crushing the least, be a kind of energy-saving flow instrument.
This differential flow detection device follows Bernoulli equation:
Wherein:
Volume flow in Q=pipeline
K=fluid coefficient
C=fluid content
DP=differential pressure value.
Visible: C is constant, Q to be determined, it must be determined that K and DP is when fluid flows quantity sensor, not only anterior at it
Producing a high pressure areal area, the pressure of high pressure areal area is higher than the static pressure of pipeline.And fluid flows quantity sensor speed per hour
Degree is accelerated, and produces a low pressure areal area at flow transducer rear portion, and the pressure of low pressure areal area is slightly below high pressure areal area
Pressure., after flow transducer flows through, there is whirlpool at flow transducer rear portion in fluid.
In the present invention, owing to the cross section of probe is feather ball-type, accurate pressure distribution, the cross section of feather ball-type can be produced
Pull strength suffered by shape is minimum, and the burble point of fluid and sensor is fixed, and can produce stable differential pressure signal,
Keep the long-term high accuracy measured.
In continuous flow is measured, the pressure of higher-pressure region is higher than duct static pressure, prevents impurity etc. to enter probe body, institute
Will not block with high pressure pressure port.And accumulation of impurities region (at the back side of probe), away from the low pressure pressure port of probe, the most miscellaneous
Matter also will not enter probe body from low pressure pressure port, so low pressure pressure port also will not block.As shown in Figure 5.
Fluid coefficient is constant in the range of sizable one, is that linear (fluid coefficient K is unlike orifice plate or venturi
Pipe changes with Reynolds number change like that), do not affected by Reynolds number, orifice size ratio.Fluid necessarily be in abundant turbulent condition,
And laminar condition can not be in.
The comparison of the traffic probe head of table 1. present invention and other shaped cross
Claims (4)
1. a differential flow detecting head, it is characterised in that be the body of one section of hollow, it is longitudinally a strip, cross section
Being two sides of an isosceles trapezoid for feather ball-type, i.e. middle part, front portion is position, base and trapezoidal two in isosceles trapezoid
The anterior circular arc that individual limit is connected, rear portion is the rear portion circular arc being connected with trapezoidal two limits in position, isosceles trapezoid bottom,
Two sides, two circular arcs enclose a space body；In this enclosed space, it is additionally provided with a separation circular arc, enclosed space is divided
Being divided into former and later two regions, forefoot area is higher-pressure region, and rear region is low-pressure area；
On dual-side pipe face, it is positioned at the mid-area location of low-pressure area, is provided with some low pressure pressures along probe length direction
Hole；In the anterior center, arc tube face of probe, it is provided with some high pressure pressure ports along probe length direction；These osseotomy site
It is totally submerged in use in the duct, is used for collecting data on flows.
Differential flow detecting head the most according to claim 1, it is characterised in that a length of the 14 ~ 45 of side, dual-side
Front end spacing be 12 ~ 36, the rear end spacing of dual-side is 15 ~ 45, and front end is smaller than rear end spacing；The half of anterior circular arc
Footpath is 7 ~ 21, and the radius of rear portion circular arc is 10 ~ 30, and the radius separating circular arc is 16 ~ 48, separates between circular arc and anterior circular arc top margin
Away from for 12 ~ 36；A diameter of 2 ~ 4 of low pressure pressure port on dual-side, a diameter of 3 ~ 5 of the high pressure pressure port on anterior circular arc,
And the diameter of low pressure pressure port is less than the diameter of high pressure pressure port；Above unit is mm.
Differential flow detecting head the most according to claim 1, it is characterised in that the quantity of high pressure pressure port is 2 ~ 16
Individual, low pressure pressure port quantity is 2 right ~ 16 right.
4. a differential flow detection device, it is characterised in that comprise the differential flow detection as described in one of claim 1-3
Head, a differential pressure transmitter and one can connect for differential flow detecting head higher-pressure region and low-pressure area are converted into differential pressure transmitter
The switching device received；Described differential flow detecting head is as measuring cell, and measurement flow in pipeline is stretched in its lower end, and upper end is passed through
Switching device connects with differential pressure transmitter；
Described switching device is the pipeline communicated up and down, and its lower end is connected with differential flow detecting head upper end, its upper end and differential pressure
Transmitter connects；Wherein, the switching device lower end mouth of pipe matches with differential flow detecting head higher-pressure region and low-pressure area, switching device
The upper end mouth of pipe matches with the high and low pressure receiving port of differential pressure transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610158318.1A CN105841756A (en) | 2016-03-21 | 2016-03-21 | Pressure difference flow detection head and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610158318.1A CN105841756A (en) | 2016-03-21 | 2016-03-21 | Pressure difference flow detection head and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105841756A true CN105841756A (en) | 2016-08-10 |
Family
ID=56588250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610158318.1A Pending CN105841756A (en) | 2016-03-21 | 2016-03-21 | Pressure difference flow detection head and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593017A (en) * | 2018-04-08 | 2018-09-28 | 江阴市节流装置厂有限公司 | A kind of Multifunctional blast volume measuring device |
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|---|---|---|---|---|
| CN2777507Y (en) * | 2005-01-26 | 2006-05-03 | 广州万德威尔自动化系统有限公司 | Wilba flow-meter |
| CN102155966A (en) * | 2011-03-30 | 2011-08-17 | 黑龙江省科学院科技孵化中心 | Method for measuring marsh gas reserve in anaerobic fermenting tank and device for implementing method |
| CN102252715A (en) * | 2011-04-15 | 2011-11-23 | 王荣虎 | Europa sensor and flow measurement control system |
| CN203704986U (en) * | 2014-02-18 | 2014-07-09 | 江苏润仪仪表有限公司 | High-precision inserting type multi-dimensional sensing flowmeter |
| CN205483097U (en) * | 2016-03-21 | 2016-08-17 | 上海晓秋自动化工程有限公司 | Differential pressure flow detecting head and contain differential pressure flow detecting device of this detecting head |
-
2016
- 2016-03-21 CN CN201610158318.1A patent/CN105841756A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2777507Y (en) * | 2005-01-26 | 2006-05-03 | 广州万德威尔自动化系统有限公司 | Wilba flow-meter |
| CN102155966A (en) * | 2011-03-30 | 2011-08-17 | 黑龙江省科学院科技孵化中心 | Method for measuring marsh gas reserve in anaerobic fermenting tank and device for implementing method |
| CN102252715A (en) * | 2011-04-15 | 2011-11-23 | 王荣虎 | Europa sensor and flow measurement control system |
| CN203704986U (en) * | 2014-02-18 | 2014-07-09 | 江苏润仪仪表有限公司 | High-precision inserting type multi-dimensional sensing flowmeter |
| CN205483097U (en) * | 2016-03-21 | 2016-08-17 | 上海晓秋自动化工程有限公司 | Differential pressure flow detecting head and contain differential pressure flow detecting device of this detecting head |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593017A (en) * | 2018-04-08 | 2018-09-28 | 江阴市节流装置厂有限公司 | A kind of Multifunctional blast volume measuring device |
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Application publication date: 20160810 |