CN102620786B - Cascade-type double-orifice-plate differential pressure fluid flow measuring device and measuring method thereof - Google Patents
Cascade-type double-orifice-plate differential pressure fluid flow measuring device and measuring method thereof Download PDFInfo
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Abstract
The invention discloses a cascade-type double-orifice-plate differential pressure fluid flow measuring device and a measuring method thereof. The cascade-type double-orifice-plate differential pressure fluid flow measuring device is provided with two standard orifice plates of different specifications and two differential pressure sensors of different measuring ranges; flows of different ranges in the main fluid pipeline are measured separately by means of cascade-type sectioning through two independent two-position three-way reversing valve groups, so that large flows are measured by big orifice plates, and small flows are measured by small orifice plates; inlet pressures, temperatures and differential pressure signals of the orifice plates are sent to an arithmetic facility to calculate the flow of the air, the fluid flows in the pipeline are measured accurately, and precision of the measurements are improved. Accordingly, production quality of the products is guaranteed to meet the related standard requirements, and the problem of inaccurate measurements of small flows caused by single orifice plates is solved.
Description
Technical field
The present invention relates to a kind of staged spectacle plate differential pressure fluid flow rate measurement apparatus and measuring method thereof.
Background technology
The orifice plate flow apparatus is widely used in the measurement of production process flows such as metallurgy, electric power, coal, chemical industry, oil, heat supply, aviation, as to liquid, and air, the measurement of the flow of fluids such as steam.If the pore plate flow measurement device precision is not high, cause and can't accurately monitor flow, will influence normal production, even have a strong impact on the quality of product.At present, measuring liquid, air, in the time of the flow of media such as steam, all use conventional methods, a standard orifice plate is installed in above the fluid line, adopt pressure and temperature sensor and differential pressure pickup to measure and be converted into electric signal respectively to the pressure reduction of the pressure and temperature before the orifice plate and front and back, flow to secondary instrument, calculate flow.In view of the size constancy of orifice plate, measurement range is also with constant, under the big situation of fluid flow, and the method accuracy height of this measurement flow.But in actual production, fluid in the pipeline be not round-the-clock all be to move in the mode of big flow, sometimes because supplied upstream lacks or the few reason of downstream air consumption, also can move in the mode of low discharge, but because employing is big flow-through orifice, under the constant situation of precision, the method of this measurement fluid flow, the flow that it records and actual flow will produce very big deviation, the accuracy of influence metering, and then influencing the production in downstream, the deterioration in quality that causes the downstream to produce has a strong impact on the reputation of enterprise!
Summary of the invention
The purpose of this invention is to provide a kind of staged spectacle plate differential pressure fluid flow rate measurement apparatus, solved the inaccurate difficult problem of measurement low discharge that single orifice plate causes, can accurately measure the flow of wide range scope fluid.
Another object of the present invention provides a kind of staged spectacle plate differential pressure measurement of fluid flow method.
The objective of the invention is to realize by following technical measures:
A kind of staged spectacle plate differential pressure fluid flow rate measurement apparatus, comprise the trunk line for the treatment of that fluid measured flows through, first pressure transducer and be used for to calculate the arithmetic facility of fluid flow to be measured, the large aperture orifice plate is installed on the described trunk line and is used for gathering the temperature sensor of fluid temperature (F.T.) to be measured, the impulse mouth of described first pressure transducer is communicated with the import of described large aperture orifice plate, it is characterized in that: described flow measurement device also is provided with caliber less than the branch pipe(tube) of described trunk line, second pressure transducer, be used for gathering low pressure differential pressure pickup and the high pressure differential pressure pickup of orifice plate inlet outlet pressure differential data; Described trunk line is provided with tap hole and the hole of confluxing at the pipeline section that is positioned at orifice plate downstream, large aperture, described branch pipe(tube) is communicated with the tap hole of trunk line and the hole of confluxing, the small-bore orifice plate is installed on the described branch pipe(tube), described trunk line is equipped with the shut-off valve that is controlled by described arithmetic facility at tap hole and the pipeline section that confluxes between the hole, the impulse mouth of described second pressure transducer is communicated with the import of described small-bore orifice plate, the height of described low pressure differential pressure pickup, first strobe unit of low pressure impulse mouth by being controlled by described arithmetic facility is to select advancing of a mode that is communicated with and described large aperture orifice plate, advancing of outlet or small-bore orifice plate, outlet is communicated with, the height of described high pressure differential pressure pickup, second strobe unit of low pressure impulse mouth by being controlled by described arithmetic facility is to select advancing of a mode that is communicated with and described large aperture orifice plate, advancing of outlet or small-bore orifice plate, outlet is communicated with, described temperature sensor, first pressure transducer, second pressure transducer, the signal output part of low pressure differential pressure pickup and high pressure differential pressure pickup is electrically connected with the corresponding interface of described arithmetic facility respectively.
A kind of embodiment as invention, described first strobe unit comprises first reversal valve and second reversal valve of the two-position three way that is controlled by described arithmetic facility, described second strobe unit comprises the 3rd reversal valve and the 4th reversal valve of the two-position three way that is controlled by described arithmetic facility, the import of described large aperture orifice plate is communicated with the right import of described first reversal valve and the 3rd reversal valve respectively, the outlet of described large aperture orifice plate is communicated with the right import of described second reversal valve and the 4th reversal valve respectively, the import of described small-bore orifice plate is communicated with the left import of described first reversal valve and the 3rd reversal valve respectively, the outlet of described small-bore orifice plate is communicated with the left import of described second reversal valve and the 4th reversal valve respectively, the high pressure impulse mouth of described low pressure differential pressure pickup is communicated with the outlet of described first reversal valve, low pressure impulse mouth is communicated with the outlet of described second reversal valve, and the high pressure impulse mouth of described high pressure differential pressure pickup is communicated with the outlet of described the 3rd reversal valve, low pressure impulse mouth is communicated with the outlet of described the 4th reversal valve.
A kind of embodiment as invention, described first reversal valve and second reversal valve are formed the first coordinated type reversal valve group that is controlled by described arithmetic facility, and described the 3rd reversal valve and the 4th reversal valve are formed the second coordinated type reversal valve group that is controlled by described arithmetic facility.
A kind of embodiment as invention, have on the described trunk line and be positioned at first of orifice plate entrance location dead ahead, large aperture and adopt and press the hole, second of dead astern, exit position is adopted and is pressed the hole, have on the described branch pipe(tube) and be positioned at the 3rd of orifice plate entrance location dead ahead, small-bore and adopt and press the hole, the 4th of dead astern, exit position is adopted and is pressed the hole, the impulse mouth of described first pressure transducer is adopted by described first and is pressed the hole to be communicated with the import of described large aperture orifice plate, the import of described large aperture orifice plate is adopted by described first and is pressed the hole, outlet is adopted by described second and is pressed the hole to be communicated with the right import of described reversal valve respectively, the impulse mouth of described second pressure transducer is adopted by the described the 3rd and is pressed the hole to be communicated with the import of described small-bore orifice plate, and the import of described small-bore orifice plate is adopted by the described the 3rd and pressed the hole, outlet is adopted by the described the 4th and is pressed the hole to be communicated with the left import of described reversal valve respectively.
A kind of embodiment as invention, described first adopts that to press the hole to be opened at a distance of described large aperture orifice plate be on the position of electrical path length in ten times of trunk lines, described second adopts that to press the hole to be opened at a distance of described large aperture orifice plate be on the position of electrical path length in five times of trunk lines, the described the 3rd adopts that to press the hole to be opened at a distance of described small-bore orifice plate be on the position of electrical path length in ten times of branch pipe(tube)s, and the described the 4th adopts that to press the hole to be opened at a distance of described small-bore orifice plate be on the position of electrical path length in five times of branch pipe(tube)s.
In order to guarantee the functional reliability of flow measurement device, described shut-off valve, first reversal valve, second reversal valve, the 3rd reversal valve and the 4th reversal valve are Pneumatic valve, described flow measurement device comprises that also a port is communicated with the gas source pipe of low-pressure gas source, by gas flow artificial shut-off valve is installed successively on the described gas source pipe, filtrator, reduction valve and tensimeter, the another port of described gas source pipe is communicated with first solenoid valve that is controlled by described arithmetic facility respectively, the air intake opening of second solenoid valve and the 3rd solenoid valve, described first solenoid valve, the exhausr port of second solenoid valve and the 3rd solenoid valve is communicated with the air intake opening of exhaust box respectively, the gas outlet of described first solenoid valve is communicated with the control mouth of described shut-off valve, the gas outlet of described second solenoid valve is communicated with the control mouth of the described first coordinated type reversal valve group, the gas outlet of described the 3rd solenoid valve is communicated with the control mouth of the described second coordinated type reversal valve group, described first solenoid valve, second solenoid valve and the 3rd solenoid valve are the two position three-way valve of closed type.
Another object of the present invention is achieved through the following technical measures:
Described flow-measuring method carries out at the described staged spectacle plate of claim 5 differential pressure fluid flow rate measurement apparatus, comprises the steps:
(a) flow measurement device initialization, the valve closing of shut-off valve, the right import of the first coordinated type reversal valve group and the second coordinated type reversal valve group is closed, left import is opened;
(b) record the temperature data for the treatment of fluid measured in the trunk line by temperature sensor, record the pressure data of large aperture orifice plate import by first pressure transducer, record the pressure data of small-bore orifice plate import by second pressure transducer;
The pressure difference data that the small-bore orifice plate is imported and exported when (c) recording step (a) by the low pressure differential pressure pickup, the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(d) if step (c) mesolow differential pressure pickup full scale, then arithmetic facility is controlled the first coordinated type reversal valve group switch operating position, the left import of the first coordinated type reversal valve group is closed, right import is opened, record the pressure difference data that the small-bore orifice plate is imported and exported by the high pressure differential pressure pickup, the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(e) if treat that the flow of fluid measured exceeds the upper limit flow of small-bore orifice plate in the step (d), then arithmetic facility is controlled shut-off valve switch operating position, the valve open of shut-off valve, arithmetic facility is controlled the second coordinated type reversal valve group switch operating position, the left import of the second coordinated type reversal valve group is closed, right import is opened, record the pressure difference data that this moment, the large aperture orifice plate was imported and exported by the low pressure differential pressure pickup, the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(f) if step (e) mesolow differential pressure pickup full scale, then arithmetic facility is controlled the first coordinated type reversal valve group switch operating position, the right import of the first coordinated type reversal valve group is closed, left import is opened, record the pressure difference data that the large aperture orifice plate is imported and exported by the high pressure differential pressure pickup, the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured.
Compared with prior art, staged spectacle plate differential pressure fluid flow rate measurement apparatus of the present invention adopts the standard orifice plate of two different sizes and the differential pressure pickup of two different ranges, mode by the ladder segmentation, namely overlap independently two position three way directional control valve group by two, the flow of different range separates measurement in the convection cell trunk line, reaching big flow adopts big orifice plate to measure, low discharge adopts aperture plate to measure, and the intake pressure of orifice plate and temperature and pressure difference signal be transported to the flow that arithmetic facility calculates air together, fluid flow in the pipeline is measured accurately, improve the precision of metering, thereby guarantee the production quality of product, satisfy the requirement of relevant criterion, solved the inaccurate difficult problem of measurement low discharge that single orifice plate causes.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structure principle chart of the embodiment of the invention one;
Fig. 2 is the structure principle chart of gas source supply device in the embodiment of the invention two;
Among the figure: the T1-temperature sensor; P1-first pressure transducer; B1-large aperture orifice plate; The V1-shut-off valve; A1-orifice plate control source of the gas; P2-second pressure transducer; B2-small-bore orifice plate; V2-first reversal valve; V3-second reversal valve; The GV1-first coordinated type reversal valve group; V4-the 3rd reversal valve; V5-the 4th reversal valve; The GV2-second coordinated type reversal valve group; DP1-low pressure differential pressure pickup; DP2-high pressure differential pressure pickup; A2-low pressure pressure reduction control source of the gas; A3-high pressure pressure reduction control source of the gas; The A0-low-pressure gas source; The artificial shut-off valve of V6-; The V11-filtrator; The V7-reduction valve; The P3-tensimeter; V8-first solenoid valve; V9-second solenoid valve; V10-the 3rd solenoid valve.
Embodiment
Embodiment one
As shown in Figure 1, staged spectacle plate differential pressure fluid flow rate measurement apparatus of the present invention, comprise the trunk line for the treatment of that fluid measured flows through, the first pressure transducer P1 and be used for to calculate the arithmetic facility of fluid flow to be measured, large aperture orifice plate B1 is installed on the described trunk line and is used for gathering the temperature sensor T1 of fluid temperature (F.T.) to be measured, the impulse mouth of the described first pressure transducer P1 is communicated with the import of described large aperture orifice plate B1, be that with flow measurement device difference of the prior art this flow measurement device also is provided with caliber less than the branch pipe(tube) of described trunk line, the second pressure transducer P2, be used for gathering low pressure differential pressure pickup DP1 and the high pressure differential pressure pickup DP2 of orifice plate inlet outlet pressure differential data; Described trunk line is provided with tap hole 5 and the hole 6 of confluxing at the pipeline section that is positioned at orifice plate B1 downstream, large aperture, described branch pipe(tube) is communicated with the tap hole 5 of trunk line and the hole 6 of confluxing, small-bore orifice plate B2 is installed on the described branch pipe(tube), described trunk line is equipped with the shut-off valve V1 that is controlled by described arithmetic facility at tap hole 5 and the pipeline section that confluxes between the hole 6, this shut-off valve V1 opens when the flow full scale of small-bore orifice plate B2, the impulse mouth of the described second pressure transducer P2 is communicated with the import of described small-bore orifice plate B2, the height of described low pressure differential pressure pickup DP1, first strobe unit of low pressure impulse mouth by being controlled by described arithmetic facility is to select advancing of a mode that is communicated with and described large aperture orifice plate B1, outlet or small-bore orifice plate B2 advance, outlet is communicated with, this first strobe unit is advancing large aperture orifice plate B1 when low pressure differential pressure pickup DP1 full scale, the height of outlet and low pressure differential pressure pickup DP1, low pressure impulse mouth is communicated with, the height of described high pressure differential pressure pickup DP2, second strobe unit of low pressure impulse mouth by being controlled by described arithmetic facility is to select advancing of a mode that is communicated with and described large aperture orifice plate B1, outlet or small-bore orifice plate B2 advance, outlet is communicated with, this second strobe unit is advancing large aperture orifice plate B1 when high pressure differential pressure pickup DP2 full scale, the height of outlet and high pressure differential pressure pickup DP2, low pressure impulse mouth is communicated with, described temperature sensor T1, the first pressure transducer P1, the second pressure transducer P2, the signal output part of low pressure differential pressure pickup DP1 and high pressure differential pressure pickup DP2 is electrically connected with the corresponding interface of described arithmetic facility respectively.In actual applications, the range of low pressure differential pressure pickup DP1 is less, measuring accuracy when treating the fluid measured minimum flow to satisfy is the condition of choosing of range, and the range of high pressure differential pressure pickup DP2 is bigger, and the measurement range when treating the fluid measured maximum flow to satisfy is the condition of choosing of range.
Wherein, above-mentioned first strobe unit comprises the first reversal valve V2 and the second reversal valve V3 of the two-position three way that is controlled by described arithmetic facility, described second strobe unit comprises the 3rd reversal valve V4 and the 4th reversal valve V5 of the two-position three way that is controlled by described arithmetic facility, the import of described large aperture orifice plate B1 is communicated with the right import of the described first reversal valve V2 and the 3rd reversal valve V4 respectively, the outlet of described large aperture orifice plate B1 is communicated with the right import of the described second reversal valve V3 and the 4th reversal valve V5 respectively, the import of described small-bore orifice plate B2 is communicated with the left import of the described first reversal valve V2 and the 3rd reversal valve V4 respectively, the outlet of described small-bore orifice plate B2 is communicated with the left import of the described second reversal valve V3 and the 4th reversal valve V5 respectively, the high pressure impulse mouth of described low pressure differential pressure pickup DP1 is communicated with the outlet of the described first reversal valve V2, low pressure impulse mouth is communicated with the outlet of the described second reversal valve V3, and the high pressure impulse mouth of described high pressure differential pressure pickup DP2 is communicated with the outlet of described the 3rd reversal valve V4, low pressure impulse mouth is communicated with the outlet of described the 4th reversal valve V5.The left import of these four reversal valves is in opening state under normal conditions, and right import is in closed condition under normal conditions, and they can select Pneumatic valve, pilot operated valve device, solenoid valve for use in response to the service condition of device, or other control the valve of forms in the prior art.And, in response to measurement device fluid of different nature, also can select corresponding valve in the prior art for use as gas, liquid or steam.
The above-mentioned first reversal valve V2 and the second reversal valve V3 can form the first coordinated type reversal valve group GV1 that is controlled by described arithmetic facility, and described the 3rd reversal valve V4 and the 4th reversal valve V5 can form the second coordinated type reversal valve group GV2 that is controlled by described arithmetic facility.
Have on the above-mentioned trunk line and be positioned at first of orifice plate B1 entrance location dead ahead, large aperture and adopt and press hole 1, second of dead astern, exit position is adopted and is pressed hole 2, have on the described branch pipe(tube) and be positioned at the 3rd of orifice plate B2 entrance location dead ahead, small-bore and adopt and press hole 3, the 4th of dead astern, exit position is adopted and is pressed hole 4, the impulse mouth of the described first pressure transducer P1 is adopted by described first and is pressed hole 1 to be communicated with the import of described large aperture orifice plate B1, the import of described large aperture orifice plate B1 is adopted by described first and is pressed hole 1, outlet is adopted by described second and is pressed hole 2 to be communicated with the right import of described reversal valve respectively, the impulse mouth of the described second pressure transducer P2 is adopted by the described the 3rd and is pressed hole 3 to be communicated with the import of described small-bore orifice plate B2, and the import of described small-bore orifice plate B2 is adopted by the described the 3rd and pressed hole 3, outlet is adopted by the described the 4th and is pressed hole 4 to be communicated with the left import of described reversal valve respectively.
Preferably, above-mentioned first adopts that to press hole 1 to be opened at a distance of described large aperture orifice plate B1 be on the position of electrical path length in ten times of trunk lines, described second adopts that to press hole 2 to be opened at a distance of described large aperture orifice plate B1 be on the position of electrical path length in five times of trunk lines, the described the 3rd adopts that to press hole 3 to be opened at a distance of described small-bore orifice plate B2 be on the position of electrical path length in ten times of branch pipe(tube)s, the described the 4th adopts that to press hole 4 to be opened at a distance of described small-bore orifice plate B2 be on the position of electrical path length in five times of branch pipe(tube)s, and the pressure mode of adopting of thieff hatch to be the corner connection of standard adopt pressure.
In addition, adopt and press hole 1,2,3,4 preferentially to select for use English system (4) pipe to be communicated with two coordinated type reversal valve group GV1, GV2 for above-mentioned four, and by threeway realization shunt.
Staged spectacle plate differential pressure measurement of fluid flow method of the present invention is carried out at above-mentioned staged spectacle plate differential pressure fluid flow rate measurement apparatus, comprises the steps:
(a) flow measurement device initialization, the valve closing of shut-off valve V1, the right import of the first coordinated type reversal valve group GV1 and the second coordinated type reversal valve group GV2 is closed, left import is opened; Be flowing in treating in the trunk line and split into two-way after fluid measured flows through large aperture orifice plate B1, one the tunnel is flowing in the trunk line and is turned off valve V1 and blocks, another road is flowing in the branch pipe(tube), flow through behind the orifice plate B2 of small-bore from trunk line is confluxed in the hole of confluxing, adopting the fluid measured one tunnel for the treatment of of pressing hole 1 and second to adopt 2 outflows of pressure hole by first in the trunk line is blocked by the first coordinated type reversal valve group GV1, another road is blocked by the second coordinated type reversal valve group GV2, adopt by the 3rd in the branch pipe(tube) and press hole 3 and the 4th to adopt to press that hole 4 flows out treats that fluid measured leads up to the first coordinated type reversal valve group GV1 and flow into the height of low pressure differential pressure pickup DP1, low pressure impulse mouth, another road flow into the height of high pressure differential pressure pickup DP2 by the second coordinated type reversal valve group GV2, low pressure impulse mouth;
(b) record the temperature data for the treatment of fluid measured in the trunk line by temperature sensor T1, record the pressure data of large aperture orifice plate B1 import by the first pressure transducer P1, record the pressure data of small-bore orifice plate B2 import by the second pressure transducer P2;
The pressure difference data that small-bore orifice plate B2 imports and exports when (c) recording step (a) by low pressure differential pressure pickup DP1, the data that arithmetic facility obtains with this pressure difference data and step (b), calculate formula according to known orifice flowmeter and calculate the flow for the treatment of fluid measured, this computing formula is prior art, does not repeat them here;
(d) if step (c) mesolow differential pressure pickup DP1 full scale, then arithmetic facility is controlled the first coordinated type reversal valve group GV1 switch operating position, the left import of the first coordinated type reversal valve group GV1 is closed, right import is opened, adopting the fluid measured for the treatment of of pressing hole 3 and the 4th to adopt 4 outflows of pressure hole by the 3rd in the branch pipe(tube) is blocked by the first coordinated type reversal valve group GV1, adopt the fluid measured for the treatment of of pressing hole 1 and second to adopt 2 outflows of pressure hole by first in the trunk line and pass through the height that the first coordinated type reversal valve group GV1 flows into low pressure differential pressure pickup DP1, low pressure impulse mouth, record the pressure difference data that small-bore orifice plate B2 imports and exports by high pressure differential pressure pickup DP2, the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(e) if treat that the flow of fluid measured exceeds the flow range of small-bore orifice plate B2 in the step (d), then arithmetic facility is controlled shut-off valve V1 switch operating position, the valve open of shut-off valve V1, the fluid measured for the treatment of in the trunk line flows through shut-off valve V1, arithmetic facility is controlled the second coordinated type reversal valve group GV2 switch operating position, the left import of the second coordinated type reversal valve group GV2 is closed, right import is opened, adopting the fluid measured for the treatment of of pressing hole 3 and the 4th to adopt 4 outflows of pressure hole by the 3rd in the branch pipe(tube) is blocked by the second coordinated type reversal valve group GV2, adopt the fluid measured for the treatment of of pressing hole 1 and second to adopt 2 outflows of pressure hole by first in the trunk line and pass through the height that the second coordinated type reversal valve group GV2 flows into high pressure differential pressure pickup DP2, low pressure impulse mouth, record the pressure difference data that this moment, large aperture orifice plate B1 imported and exported by low pressure differential pressure pickup DP1, the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(f) if step (e) mesolow differential pressure pickup DP1 full scale, then arithmetic facility is controlled the first coordinated type reversal valve group GV1 switch operating position, the right import of the first coordinated type reversal valve group GV1 is closed, left side import is opened, adopting the fluid measured for the treatment of of pressing hole 1 and second to adopt 2 outflows of pressure hole by first in the trunk line is blocked by the first coordinated type reversal valve group GV1, adopt the fluid measured for the treatment of of pressing hole 3 and the 4th to adopt 4 outflows of pressure hole by the 3rd in the branch pipe(tube) and pass through the height that the first coordinated type reversal valve group GV1 flows into low pressure differential pressure pickup DP1, low pressure impulse mouth, record the pressure difference data that large aperture orifice plate B1 imports and exports by high pressure differential pressure pickup DP2, the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured.
Embodiment two
As shown in Figure 2, flow measurement device often is applied in the commercial production, be used for measuring the flow of fluid, such production environment generally is to include humidity, high temperature, high pressure, the environment that abominable situation such as etchant gas is arranged, if device adopts solenoid valve, the poor reliability that commutates will appear, problems such as commutating frequency is low, in order to guarantee the functional reliability of flow measurement device, the flow measurement device of embodiment two is basic identical with above-described embodiment one, its difference is shut-off valve V1, the first reversal valve V2, the second reversal valve V3, the 3rd reversal valve V4 and the 4th reversal valve V5 all adopt Pneumatic valve, and the flow measurement device of embodiment two also comprises the orifice plate control air source A 1 that is provided for driving control shut-off valve V1, be used for driving the low pressure pressure reduction control air source A 2 of the control first coordinated type reversal valve group GV1, be used for driving the gas source supply device of the high pressure pressure reduction control air source A 3 of controlling the second coordinated type reversal valve group GV2, this gas source supply device comprises that a port is communicated with the gas source pipe of low-pressure gas source A0, by gas flow artificial shut-off valve V6 is installed successively on the described gas source pipe, filtrator V11, reduction valve V7 and tensimeter P3, the another port of described gas source pipe is communicated with the first solenoid valve V8 that is controlled by described arithmetic facility respectively, the air intake opening of the second solenoid valve V9 and the 3rd solenoid valve V10, the first solenoid valve V8, the exhausr port of the second solenoid valve V9 and the 3rd solenoid valve V10 is communicated with the air intake opening of exhaust box V12 respectively, the gas outlet of the first solenoid valve V8 produces orifice plate control air source A 1, and it is communicated with the control mouth of described shut-off valve V1; The gas outlet of the second solenoid valve V9 produces low pressure pressure reduction control air source A 2, and it is communicated with the control mouth of the described first coordinated type reversal valve group GV1; The gas outlet of the 3rd solenoid valve V10 produces high pressure pressure reduction control air source A 3, and it is communicated with the control mouth of the described second coordinated type reversal valve group GV2, and the described first solenoid valve V8, the second solenoid valve V9 and the 3rd solenoid valve V10 are the two position three-way valve of closed type.
The principle of work of present embodiment two is as follows:
At first, big flow fluid is in trunk line, at first through a temperature sensor T1, flow into the large aperture orifice plate B1 of staged spectacle plate differential pressure air-flow measurement device, shut-off valve V1 is normally closed, and fluid flows into small-bore orifice plate B2, and two orifice plates are all measured intake pressure and the front and back pressure reduction of orifice plate, but because the front and back pressure difference signal of big orifice plate all is sent to the normally closed port of the first coordinated type reversal valve group GV1 and the second coordinated type reversal valve group GV2, orifice plate B1 is ineffective in the large aperture; The front and back pressure difference signal of small-bore orifice plate B2 all is sent to normal opening and two differential pressure pickup DP1 and the DP2 butt joint of the first coordinated type reversal valve group GV1 and the second coordinated type reversal valve group GV2, and device at first carries out the Fluid Computation flow according to low pressure differential pressure pickup DP1 pressure difference signal and intake pressure;
Secondly, if low pressure differential pressure pickup DP1 reaches full scale, be protection low pressure differential pressure pickup DP1, second solenoid valve V9 energising, the low pressure reduction control air source A 2 starts first coordinated type reversal valve group GV1, pressure difference signal and the low pressure differential pressure pickup DP1 of large aperture orifice plate B1 are connected, and device adopts the calculated signals fluid flow of high pressure differential pressure pickup DP2 simultaneously;
Again, when air mass flow exceeds the flow range of small-bore orifice plate B2, first solenoid valve V8 energising, 1 start of orifice plate control air source A, open shut-off valve V1, simultaneously, the 3rd solenoid valve V10 energising, High Pressure Difference control air source A 3 is the start second coordinated type reversal valve group GV2 also, the second coordinated type reversal valve group GV2 connects pressure difference signal and the high pressure differential pressure pickup DP2 of large aperture orifice plate B1, orifice plate B2 is ineffective in the small-bore, and the pressure difference signal of large aperture orifice plate B1 is provided for device, and device at first carries out the Fluid Computation flow according to low pressure differential pressure pickup DP1 pressure difference signal and intake pressure;
At last; if low pressure differential pressure pickup DP1 reaches full scale; be protection low pressure differential pressure pickup DP1; second solenoid valve V9 outage; 2 starts of low pressure reduction control air source A; the first coordinated type reversal valve group GV1 is with the disconnection that is connected of large aperture orifice plate B1 and low pressure differential pressure pickup DP1, and device adopts the calculated signals fluid flow from high pressure differential pressure pickup DP2.
Embodiments of the present invention are not limited thereto, according to foregoing, ordinary skill knowledge and customary means according to this area, do not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite, the present invention can also make equivalent modifications, replacement or the change of other various ways, all can realize the object of the invention.
Claims (6)
1. staged spectacle plate differential pressure fluid flow rate measurement apparatus, comprise the trunk line for the treatment of that fluid measured flows through, first pressure transducer (P1) and be used for to calculate the arithmetic facility of fluid flow to be measured, large aperture orifice plate (B1) is installed on the described trunk line and is used for gathering the temperature sensor (T1) of fluid temperature (F.T.) to be measured, the impulse mouth of described first pressure transducer (P1) is communicated with the import of described large aperture orifice plate (B1), it is characterized in that: described flow measurement device also is provided with caliber less than the branch pipe(tube) of described trunk line, second pressure transducer (P2), be used for gathering low pressure differential pressure pickup (DP1) and the high pressure differential pressure pickup (DP2) of orifice plate inlet outlet pressure differential data; Described trunk line is provided with tap hole (5) and the hole of confluxing (6) at the pipeline section that is positioned at large aperture orifice plate (B1) downstream, described branch pipe(tube) is communicated with the tap hole (5) of trunk line and the hole of confluxing (6), small-bore orifice plate (B2) is installed on the described branch pipe(tube), the pipeline section of described trunk line between tap hole (5) and the hole of confluxing (6) is equipped with the shut-off valve (V1) that is controlled by described arithmetic facility, the impulse mouth of described second pressure transducer (P2) is communicated with the import of described small-bore orifice plate (B2), the height of described low pressure differential pressure pickup (DP1), first strobe unit of low pressure impulse mouth by being controlled by described arithmetic facility is to select advancing of a mode that is communicated with and described large aperture orifice plate (B1), outlet or small-bore orifice plate (B2) advance, outlet is communicated with, the height of described high pressure differential pressure pickup (DP2), second strobe unit of low pressure impulse mouth by being controlled by described arithmetic facility is to select advancing of a mode that is communicated with and described large aperture orifice plate (B1), outlet or small-bore orifice plate (B2) advance, outlet is communicated with, described temperature sensor (T1), first pressure transducer (P1), second pressure transducer (P2), the signal output part of low pressure differential pressure pickup (DP1) and high pressure differential pressure pickup (DP2) is electrically connected with the corresponding interface of described arithmetic facility respectively;
Described first strobe unit comprises first reversal valve (V2) and second reversal valve (V3) of the two-position three way that is controlled by described arithmetic facility, described second strobe unit comprises the 3rd reversal valve (V4) and the 4th reversal valve (V5) of the two-position three way that is controlled by described arithmetic facility, the import of described large aperture orifice plate (B1) is communicated with the right import of described first reversal valve (V2) and the 3rd reversal valve (V4) respectively, the outlet of described large aperture orifice plate (B1) is communicated with the right import of described second reversal valve (V3) and the 4th reversal valve (V5) respectively, the import of described small-bore orifice plate (B2) is communicated with the left import of described first reversal valve (V2) and the 3rd reversal valve (V4) respectively, the outlet of described small-bore orifice plate (B2) is communicated with the left import of described second reversal valve (V3) and the 4th reversal valve (V5) respectively, the high pressure impulse mouth of described low pressure differential pressure pickup (DP1) is communicated with the outlet of described first reversal valve (V2), low pressure impulse mouth is communicated with the outlet of described second reversal valve (V3), and the high pressure impulse mouth of described high pressure differential pressure pickup (DP2) is communicated with the outlet of described the 3rd reversal valve (V4), low pressure impulse mouth is communicated with the outlet of described the 4th reversal valve (V5).
2. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 1, it is characterized in that: described first reversal valve (V2) and second reversal valve (V3) are formed the first coordinated type reversal valve group (GV1) that is controlled by described arithmetic facility, and described the 3rd reversal valve (V4) and the 4th reversal valve (V5) are formed the second coordinated type reversal valve group (GV2) that is controlled by described arithmetic facility.
3. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 2, it is characterized in that: have on the described trunk line and be positioned at first of large aperture orifice plate (B1) entrance location dead ahead and adopt and press hole (1), second of dead astern, exit position is adopted and is pressed hole (2), have on the described branch pipe(tube) and be positioned at the 3rd of small-bore orifice plate (B2) entrance location dead ahead and adopt and press hole (3), the 4th of dead astern, exit position is adopted and is pressed hole (4), the impulse mouth of described first pressure transducer (P1) is adopted by described first and is pressed hole (1) to be communicated with the import of described large aperture orifice plate (B1), the import of described large aperture orifice plate (B1) is adopted by described first and is pressed hole (1) to be communicated with the right import of described first reversal valve (V2) and the 3rd reversal valve (V4) respectively, the outlet of described large aperture orifice plate (B1) is adopted by described second and is pressed hole (2) to be communicated with the right import of described second reversal valve (V3) and the 4th reversal valve (V5) respectively, the impulse mouth of described second pressure transducer (P2) is adopted by the described the 3rd and is pressed hole (3) to be communicated with the import of described small-bore orifice plate (B2), the import of described small-bore orifice plate (B2) is adopted by the described the 3rd and is pressed hole (3) to be communicated with the left import of described first reversal valve (V2) and the 3rd reversal valve (V4) respectively, and the outlet of described small-bore orifice plate (B2) is adopted by the described the 4th and pressed hole (4) to be communicated with the left import of described second reversal valve (V3) and the 4th reversal valve (V5) respectively.
4. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 3, it is characterized in that: described first adopts that to press hole (1) to be opened at a distance of described large aperture orifice plate (B1) be on the position of electrical path length in ten times of trunk lines, described second adopts that to press hole (2) to be opened at a distance of described large aperture orifice plate (B1) be on the position of electrical path length in five times of trunk lines, the described the 3rd adopts that to press hole (3) to be opened at a distance of described small-bore orifice plate (B2) be on the position of electrical path length in ten times of branch pipe(tube)s, and the described the 4th adopts that to press hole (4) to be opened at a distance of described small-bore orifice plate (B2) be on the position of electrical path length in five times of branch pipe(tube)s.
5. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 4, it is characterized in that: described shut-off valve (V1), first reversal valve (V2), second reversal valve (V3), the 3rd reversal valve (V4) and the 4th reversal valve (V5) are Pneumatic valve, described flow measurement device comprises that also a port is communicated with the gas source pipe of low-pressure gas source (A0), by gas flow artificial shut-off valve (V6) is installed successively on the described gas source pipe, filtrator (V11), reduction valve (V7) and tensimeter (P3), the another port of described gas source pipe is communicated with first solenoid valve (V8) that is controlled by described arithmetic facility respectively, the air intake opening of second solenoid valve (V9) and the 3rd solenoid valve (V10), described first solenoid valve (V8), the exhausr port of second solenoid valve (V9) and the 3rd solenoid valve (V10) is communicated with the air intake opening of exhaust box (V12) respectively, the gas outlet of described first solenoid valve (V8) is communicated with the control mouth of described shut-off valve (V1), the gas outlet of described second solenoid valve (V9) is communicated with the control mouth of the described first coordinated type reversal valve group (GV1), the gas outlet of described the 3rd solenoid valve (V10) is communicated with the control mouth of the described second coordinated type reversal valve group (GV2), described first solenoid valve (V8), second solenoid valve (V9) and the 3rd solenoid valve (V10) are the two position three-way valve of closed type.
6. a staged spectacle plate differential pressure measurement of fluid flow method is characterized in that, described flow-measuring method carries out at the described staged spectacle plate of claim 4 differential pressure fluid flow rate measurement apparatus, comprises the steps:
(a) flow measurement device initialization, the valve closing of shut-off valve (V1), the right import of the first coordinated type reversal valve group (GV1) and the second coordinated type reversal valve group (GV2) is closed, left import is opened;
(b) record the temperature data for the treatment of fluid measured in the trunk line by temperature sensor (T1), record the pressure data of large aperture orifice plate (B1) import by first pressure transducer (P1), record the pressure data of small-bore orifice plate (B2) import by second pressure transducer (P2);
The pressure difference data that small-bore orifice plate (B2) is imported and exported when (c) recording step (a) by low pressure differential pressure pickup (DP1), the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(d) if step (c) mesolow differential pressure pickup (DP1) full scale, then arithmetic facility is controlled first coordinated type reversal valve group (GV1) the switch operating position, the left import of the first coordinated type reversal valve group (GV1) is closed, right import is opened, record the pressure difference data that small-bore orifice plate (B2) is imported and exported by high pressure differential pressure pickup (DP2), the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(e) if treat that the flow of fluid measured exceeds the upper limit flow of small-bore orifice plate (B2) in the step (d), then arithmetic facility is controlled shut-off valve (V1) switch operating position, the valve open of shut-off valve (V1), arithmetic facility is controlled second coordinated type reversal valve group (GV2) the switch operating position, the left import of the second coordinated type reversal valve group (GV2) is closed, right import is opened, record the pressure difference data that large aperture orifice plate this moment (B1) is imported and exported by low pressure differential pressure pickup (DP1), the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured;
(f) if step (e) mesolow differential pressure pickup (DP1) full scale, then arithmetic facility is controlled first coordinated type reversal valve group (GV1) the switch operating position, the right import of the first coordinated type reversal valve group (GV1) is closed, left import is opened, record the pressure difference data that large aperture orifice plate (B1) is imported and exported by high pressure differential pressure pickup (DP2), the data that arithmetic facility obtains with this pressure difference data and step (b) are calculated formula according to known orifice flowmeter and are calculated the flow for the treatment of fluid measured.
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| CN 201210067263 CN102620786B (en) | 2012-03-14 | 2012-03-14 | Cascade-type double-orifice-plate differential pressure fluid flow measuring device and measuring method thereof |
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| CN201476821U (en) * | 2009-07-03 | 2010-05-19 | 毛清芳 | Double-channel pore plate gas flow rate measuring device with bypass bridge path |
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