CN202453012U - Multi-step dual-pore plate differential pressure fluid flow measurement device - Google Patents
Multi-step dual-pore plate differential pressure fluid flow measurement device Download PDFInfo
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- CN202453012U CN202453012U CN 201220096548 CN201220096548U CN202453012U CN 202453012 U CN202453012 U CN 202453012U CN 201220096548 CN201220096548 CN 201220096548 CN 201220096548 U CN201220096548 U CN 201220096548U CN 202453012 U CN202453012 U CN 202453012U
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Abstract
The utility model discloses a multi-step dual-pore plate differential pressure fluid flow measurement device. Two standard pore plates of different specifications and two differential pressure sensors with different ranges are adopted, flows within different ranges in a main fluid pipeline are separately measured in a multi-step way, namely through two sets of independent two-position three-way reversing valve groups, a large pore plate is used for measuring high flow, a small pore plate is used for measuring low flow, the inlet pressure and temperature of each pore plate and differential pressure signals are transmitted to arithmetic equipment for the calculation of air flow, and the flow of fluid in the pipeline is accurately measured to improve the measurement accuracy, so that the production quality of a product is ensured, requirements in related standards can be met, and the problem of low flow measurement inaccuracy caused by the adoption of a single pore plate is solved.
Description
Technical field
The utility model relates to a kind of staged spectacle plate differential pressure fluid flow rate measurement apparatus.
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 the pressure reduction of 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, and under the big situation of fluid flow, the method accuracy of this measurement flow is high.But in actual production, the fluid in the pipeline be not round-the-clock all be to move with the mode of big flow, sometimes because supplied upstream lacks or the few reason of downstream air consumption; Also can move, but because what adopt is big flow-through orifice, under the constant situation of precision with the mode of low discharge; The method of this measurement fluid flow; Flow that it records and actual flow will produce very big deviation, influence the accuracy of metering, and then influence the production in downstream; The deterioration in quality that causes downstream to produce has a strong impact on the reputation of enterprise!
The utility model content
The purpose of the utility model provides a kind of staged spectacle plate differential pressure fluid flow rate measurement apparatus, has solved the inaccurate difficult problem of measurement low discharge that single orifice plate causes, and can accurately measure the flow of wide range scope fluid.
The purpose of the utility model realizes through following technical measures:
A kind of staged spectacle plate differential pressure fluid flow rate measurement apparatus; Comprise trunk line, first pressure transducer of treating fluid measured and flowing through and the arithmetic facility that is used to calculate fluid flow to be measured; The large aperture orifice plate is installed on the said trunk line and is used to gather the temperature sensor of fluid temperature (F.T.) to be measured; The impulse mouth of said first pressure transducer is communicated with the import of said large aperture orifice plate, it is characterized in that: described flow measurement device also be provided with caliber less than branch pipe(tube), second pressure transducer of said trunk line, be used to gather the low pressure differential pressure pickup and the high pressure differential pressure pickup of orifice plate inlet outlet pressure differential data; Said trunk line is provided with tap hole and confluxes the hole on the pipeline section that is positioned at orifice plate downstream, large aperture; Said branch pipe(tube) is communicated with the hole of confluxing with the tap hole of trunk line; The small-bore orifice plate is installed on the said branch pipe(tube); Said trunk line is equipped with the shut-off valve that is controlled by said arithmetic facility on tap hole and the pipeline section between the hole of confluxing; The impulse mouth of said second pressure transducer is communicated with the import of said small-bore orifice plate; The high and low pressure impulse mouth of said low pressure differential pressure pickup is communicated with the import and export of said large aperture orifice plate or the import and export of small-bore orifice plate with the mode of selecting a connection through first strobe unit that is controlled by said arithmetic facility; The high and low pressure impulse mouth of said high pressure differential pressure pickup is communicated with the import and export of said large aperture orifice plate or the import and export of small-bore orifice plate with the mode of selecting a connection through second strobe unit that is controlled by said arithmetic facility, and the signal output part of said temperature sensor, first pressure transducer, second pressure transducer, low pressure differential pressure pickup and high pressure differential pressure pickup is electrically connected with the corresponding interface of said arithmetic facility respectively.
A kind of embodiment as utility model; Said first strobe unit comprises first reversal valve and second reversal valve of the two-position three way that is controlled by said arithmetic facility; Said second strobe unit comprises the 3rd reversal valve and the 4th reversal valve of the two-position three way that is controlled by said arithmetic facility; The import of said large aperture orifice plate is communicated with the right import of said first reversal valve and the 3rd reversal valve respectively; The outlet of said large aperture orifice plate is communicated with the right import of said second reversal valve and the 4th reversal valve respectively; The import of said small-bore orifice plate is communicated with the left import of said first reversal valve and the 3rd reversal valve respectively; The outlet of said small-bore orifice plate is communicated with the left import of said second reversal valve and the 4th reversal valve respectively; The high pressure impulse mouth of said low pressure differential pressure pickup is communicated with the outlet of said first reversal valve, the outlet that low pressure impulse mouth is communicated with said second reversal valve, and the high pressure impulse mouth of said high pressure differential pressure pickup is communicated with the outlet of said the 3rd reversal valve, the outlet that low pressure impulse mouth is communicated with said the 4th reversal valve.
A kind of embodiment as utility model; Said first reversal valve and second reversal valve are formed the first coordinated type reversal valve group that is controlled by said arithmetic facility, and said the 3rd reversal valve and the 4th reversal valve are formed the second coordinated type reversal valve group that is controlled by said arithmetic facility.
A kind of embodiment as utility model; Have on the said trunk line and be positioned at first of orifice plate entrance location dead ahead, large aperture and adopt and press second of hole, dead astern, exit position to adopt to press the hole; Have on the said branch pipe(tube) and be positioned at the 3rd of orifice plate entrance location dead ahead, small-bore and adopt and press the 4th of hole, dead astern, exit position to adopt to press the hole; The impulse mouth of said first pressure transducer is adopted through said first and is pressed the hole to be communicated with the import of said large aperture orifice plate; The import of said large aperture orifice plate is adopted through said first and is pressed hole, outlet to adopt through said second to press the hole to be communicated with the right import of said reversal valve respectively; The impulse mouth of said second pressure transducer is adopted through the said the 3rd and is pressed the hole to be communicated with the import of said small-bore orifice plate, and the import of said small-bore orifice plate is adopted through the said the 3rd and pressed the hole, exports and adopt the pressure hole through the said the 4th and be communicated with the left import of said reversal valve respectively.
A kind of embodiment as utility model; Said first adopts that to press the hole to be opened at a distance of said large aperture orifice plate be on the position of electrical path length in ten times of trunk lines; Said second adopts that to press the hole to be opened at a distance of said large aperture orifice plate be on the position of electrical path length in five times of trunk lines; The said the 3rd adopts that to press the hole to be opened at a distance of said small-bore orifice plate be on the position of electrical path length in ten times of branch pipe(tube)s, and the said the 4th adopts that to press the hole to be opened at a distance of said small-bore orifice plate be on the position of electrical path length in five times of branch pipe(tube)s.
Functional reliability for the dependable flow measurement mechanism; Said 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, filtrator, reduction valve and tensimeter are installed successively on the said gas source pipe; The another port of said gas source pipe is communicated with the air intake opening of first solenoid valve, second solenoid valve and the 3rd solenoid valve that are controlled by said arithmetic facility respectively; The exhausr port of said first solenoid valve, second solenoid valve and the 3rd solenoid valve is communicated with the air intake opening of exhaust box respectively; The gas outlet of said first solenoid valve is communicated with the control mouth of said shut-off valve; The gas outlet of said second solenoid valve is communicated with the control mouth of the said first coordinated type reversal valve group, and the gas outlet of said the 3rd solenoid valve is communicated with the control mouth of the said second coordinated type reversal valve group, and said first solenoid valve, second solenoid valve and the 3rd solenoid valve are the two position three-way valve of closed type.
Compared with prior art, the staged spectacle plate differential pressure fluid flow rate measurement apparatus of the utility model adopts the standard orifice plate of two different sizes and the differential pressure pickup of two different ranges, through the mode of ladder segmentation; Promptly overlap independently two position three way directional control valve group through two; The flow of different range separates measurement in the convection cell trunk line, reaches big flow and adopts big orifice plate to measure, and 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, improves the precision of metering, thereby guarantees 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
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to specify:
Fig. 1 is the structure principle chart of the utility model embodiment one;
Fig. 2 is the structure principle chart of gas source supply device among the utility model embodiment 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; The staged spectacle plate differential pressure fluid flow rate measurement apparatus of the utility model; Comprise trunk line, first pressure transducer P1 that treats fluid measured and flow through and the arithmetic facility that is used to calculate fluid flow to be measured; Large aperture orifice plate B1 is installed on the said trunk line and is used to gather the temperature sensor T1 of fluid temperature (F.T.) to be measured; The impulse mouth of the said first pressure transducer P1 is communicated with the import of said large aperture orifice plate B1; Be with flow measurement device difference of the prior art, this flow measurement device also be provided with caliber less than branch pipe(tube), the second pressure transducer P2 of said trunk line, be used to gather the low pressure differential pressure pickup DP1 and the high pressure differential pressure pickup DP2 of orifice plate inlet outlet pressure differential data; Said trunk line is provided with tap hole 5 and confluxes hole 6 on the pipeline section that is positioned at orifice plate B1 downstream, large aperture; Said branch pipe(tube) is communicated with the hole 6 of confluxing with the tap hole 5 of trunk line; Small-bore orifice plate B2 is installed on the said branch pipe(tube); Said trunk line is equipped with the shut-off valve V1 that is controlled by said arithmetic facility on tap hole 5 and the pipeline section between the hole 6 of confluxing; Open during the flow full scale of this shut-off valve V1 orifice plate B2 in the small-bore; The impulse mouth of the said second pressure transducer P2 is communicated with the import of said small-bore orifice plate B2; The high and low pressure impulse mouth of said low pressure differential pressure pickup DP1 is communicated with the import and export of said large aperture orifice plate B1 or the import and export of small-bore orifice plate B2 with the mode of selecting a connection through first strobe unit that is controlled by said arithmetic facility; This first strobe unit is communicated with the import and export of large aperture orifice plate B1 when low pressure differential pressure pickup DP1 full scale with the high and low pressure impulse mouth of low pressure differential pressure pickup DP1; The high and low pressure impulse mouth of said high pressure differential pressure pickup DP2 is communicated with the import and export of said large aperture orifice plate B1 or the import and export of small-bore orifice plate B2 with the mode of selecting a connection through second strobe unit that is controlled by said arithmetic facility; This second strobe unit is communicated with the import and export of large aperture orifice plate B1 when high pressure differential pressure pickup DP2 full scale with the high and low pressure impulse mouth of high pressure differential pressure pickup DP2, the signal output part of said temperature sensor T1, the first pressure transducer P1, the second pressure transducer P2, low pressure differential pressure pickup DP1 and high pressure differential pressure pickup DP2 is electrically connected with the corresponding interface of said arithmetic facility respectively.In practical application; 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 said arithmetic facility; Said 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 said arithmetic facility; The import of said large aperture orifice plate B1 is communicated with the right import of said first reversal valve V2 and the 3rd reversal valve V4 respectively; The outlet of said large aperture orifice plate B1 is communicated with the right import of said second reversal valve V3 and the 4th reversal valve V5 respectively; The import of said small-bore orifice plate B2 is communicated with the left import of said first reversal valve V2 and the 3rd reversal valve V4 respectively; The outlet of said small-bore orifice plate B2 is communicated with the left import of said second reversal valve V3 and the 4th reversal valve V5 respectively; The high pressure impulse mouth of said low pressure differential pressure pickup DP1 is communicated with the outlet of the said first reversal valve V2, the outlet that low pressure impulse mouth is communicated with the said second reversal valve V3, and the high pressure impulse mouth of said high pressure differential pressure pickup DP2 is communicated with the outlet of said the 3rd reversal valve V4, the outlet that low pressure impulse mouth is communicated with said 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 the valve of other control forms in the prior art.And,, also can select corresponding valve in the prior art for use like gas, liquid or steam in response to measurement device fluid of different nature.
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 said arithmetic facility, and said 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 said 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 second of hole 1, dead astern, exit position to adopt to press hole 2; Have on the said branch pipe(tube) and be positioned at the 3rd of orifice plate B2 entrance location dead ahead, small-bore and adopt and press the 4th of hole 3, dead astern, exit position to adopt to press hole 4; The impulse mouth of the said first pressure transducer P1 is adopted through said first and is pressed hole 1 to be communicated with the import of said large aperture orifice plate B1; The import of said large aperture orifice plate B1 is adopted through said first and is pressed hole 1, outlet to adopt through said second to press hole 2 to be communicated with the right import of said reversal valve respectively; The impulse mouth of the said second pressure transducer P2 is adopted through the said the 3rd and is pressed hole 3 to be communicated with the import of said small-bore orifice plate B2, and the import of said small-bore orifice plate B2 is adopted through the said the 3rd and pressed hole 3, exports and adopt pressure hole 4 through the said the 4th and be communicated with the left import of said reversal valve respectively.
Preferably; Above-mentioned first adopts that to press hole 1 to be opened at a distance of said large aperture orifice plate B1 be on the position of electrical path length in ten times of trunk lines; Said second adopts that to press hole 2 to be opened at a distance of said large aperture orifice plate B1 be on the position of electrical path length in five times of trunk lines; The said the 3rd adopts that to press hole 3 to be opened at a distance of said small-bore orifice plate B2 be on the position of electrical path length in ten times of branch pipe(tube)s; The said the 4th adopts that to press hole 4 to be opened at a distance of said 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 for above-mentioned four with two coordinated type reversal valve group GV1, GV2, and through threeway realization shunt.
The staged spectacle plate differential pressure measurement of fluid flow method of the utility model is carried out on 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 of treating of pressing hole 1 and second to adopt 2 outflows of pressure hole through 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, adopts through the 3rd in the branch pipe(tube) and presses 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 high and low pressure impulse mouth of low pressure differential pressure pickup DP1, and another road is through the high and low pressure impulse mouth of second coordinated type reversal valve group GV2 inflow high pressure differential pressure pickup DP2;
(b) record the temperature data of treating fluid measured in the trunk line through temperature sensor T1, record the pressure data of large aperture orifice plate B1 import, record the pressure data of small-bore orifice plate B2 import through the second pressure transducer P2 through the first pressure transducer P1;
The pressure difference data that small-bore orifice plate B2 imports and exports when (c) recording step (a) through 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 of treating fluid measured; This computing formula is a prior art, repeats no more at this;
(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 of treating of pressing hole 3 and the 4th to adopt 4 outflows of pressure hole through the 3rd in the branch pipe(tube) is blocked by the first coordinated type reversal valve group GV1; Adopt the fluid measured of treating of pressing hole 1 and second to adopt 2 outflows of pressure hole through first in the trunk line and pass through the high and low pressure impulse mouth that the first coordinated type reversal valve group GV1 flows into low pressure differential pressure pickup DP1; Record the pressure difference data that small-bore orifice plate B2 imports and exports through 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 of treating 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 of treating 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, and the left import of the second coordinated type reversal valve group GV2 is closed, right import is opened, and adopts the fluid measured of treating of pressing hole 3 and the 4th to adopt 4 outflows of pressure hole through the 3rd in the branch pipe(tube) and is blocked by the second coordinated type reversal valve group GV2; Adopt the fluid measured of treating of pressing hole 1 and second to adopt 2 outflows of pressure hole through first in the trunk line and pass through the high and low pressure impulse mouth that the second coordinated type reversal valve group GV2 flows into high pressure differential pressure pickup DP2; Record the pressure difference data that this moment, large aperture orifice plate B1 imported and exported through 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 of treating 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 import is opened; Adopting the fluid measured of treating of pressing hole 1 and second to adopt 2 outflows of pressure hole through first in the trunk line is blocked by the first coordinated type reversal valve group GV1; Adopt the fluid measured of treating of pressing hole 3 and the 4th to adopt 4 outflows of pressure hole through the 3rd in the branch pipe(tube) and pass through the high and low pressure impulse mouth that the first coordinated type reversal valve group GV1 flows into low pressure differential pressure pickup DP1; Record the pressure difference data that large aperture orifice plate B1 imports and exports through 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 of treating fluid measured.
Embodiment two
As shown in Figure 2; Flow measurement device often is applied in the commercial production; Be used to measure the flow of fluid; Such production environment generally is the environment that includes humidity, high temperature, high pressure, abominable situation such as etchant gas is arranged; If device adopts solenoid valve; Problem such as poor reliability, commutating frequency be low will occur commutating; Functional reliability for the dependable flow measurement mechanism; The flow measurement device of embodiment two is basic identical with the foregoing description one, and its difference is that 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 comprises that also the orifice plate control air source A 1 that is provided for drive controlling shut-off valve V1, the low pressure pressure reduction control air source A 2 that is used for the drive controlling first coordinated type reversal valve group GV1, the high pressure pressure reduction that is used for the drive controlling second coordinated type reversal valve group GV2 controls the gas source supply device of air source A 3; 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, filtrator V11, reduction valve V7 and tensimeter P3 are installed successively on the said gas source pipe, the another port of said gas source pipe is communicated with the air intake opening of the first solenoid valve V8, the second solenoid valve V9 and the 3rd solenoid valve V10 that are controlled by said arithmetic facility respectively, and the exhausr port of the first solenoid valve V8, 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 said 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 said 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 said second coordinated type reversal valve group GV2, and the said 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 following:
The flow fluid is in trunk line, at first through a temperature sensor T1 at first, greatly; 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 the 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 nc 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 differential 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;
Once more, 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 is opened 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, and 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, and orifice plate B2 is ineffective in the small-bore; 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 differential 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.
The embodiment of the utility model is 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 utility model prerequisite, equivalent modifications, replacement or change that the utility model can also be made other various ways all can realize the utility model purpose.
Claims (6)
1. staged spectacle plate differential pressure fluid flow rate measurement apparatus; Comprise trunk line, first pressure transducer (P1) of treating fluid measured and flowing through and the arithmetic facility that is used to calculate fluid flow to be measured; Large aperture orifice plate (B1) is installed on the said trunk line and is used to gather the temperature sensor (T1) of fluid temperature (F.T.) to be measured; The impulse mouth of said first pressure transducer (P1) is communicated with the import of said large aperture orifice plate (B1), it is characterized in that: described flow measurement device also be provided with caliber less than branch pipe(tube), second pressure transducer (P2) of said trunk line, be used to gather the low pressure differential pressure pickup (DP1) and the high pressure differential pressure pickup (DP2) of orifice plate inlet outlet pressure differential data; Said trunk line is provided with tap hole (5) and the hole of confluxing (6) on the pipeline section that is positioned at large aperture orifice plate (B1) downstream; Said 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 said branch pipe(tube); Said trunk line is equipped with the shut-off valve (V1) that is controlled by said arithmetic facility on the pipeline section between tap hole (5) and the hole of confluxing (6); The impulse mouth of said second pressure transducer (P2) is communicated with the import of said small-bore orifice plate (B2); The high and low pressure impulse mouth of said low pressure differential pressure pickup (DP1) is communicated with the import and export of said large aperture orifice plate (B1) or the import and export of small-bore orifice plate (B2) with the mode of selecting a connection through first strobe unit that is controlled by said arithmetic facility; The high and low pressure impulse mouth of said high pressure differential pressure pickup (DP2) is communicated with the import and export of said large aperture orifice plate (B1) or the import and export of small-bore orifice plate (B2) with the mode of selecting a connection through second strobe unit that is controlled by said arithmetic facility, and the signal output part of said temperature sensor (T1), first pressure transducer (P1), second pressure transducer (P2), low pressure differential pressure pickup (DP1) and high pressure differential pressure pickup (DP2) is electrically connected with the corresponding interface of said arithmetic facility respectively.
2. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 1; It is characterized in that: said first strobe unit comprises first reversal valve (V2) and second reversal valve (V3) of the two-position three way that is controlled by said arithmetic facility; Said 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 said arithmetic facility; The import of said large aperture orifice plate (B1) is communicated with the right import of said first reversal valve (V2) and the 3rd reversal valve (V4) respectively; The outlet of said large aperture orifice plate (B1) is communicated with the right import of said second reversal valve (V3) and the 4th reversal valve (V5) respectively; The import of said small-bore orifice plate (B2) is communicated with the left import of said first reversal valve (V2) and the 3rd reversal valve (V4) respectively; The outlet of said small-bore orifice plate (B2) is communicated with the left import of said second reversal valve (V3) and the 4th reversal valve (V5) respectively; The high pressure impulse mouth of said low pressure differential pressure pickup (DP1) is communicated with the outlet of said first reversal valve (V2), the outlet that low pressure impulse mouth is communicated with said second reversal valve (V3), and the high pressure impulse mouth of said high pressure differential pressure pickup (DP2) is communicated with the outlet of said the 3rd reversal valve (V4), the outlet that low pressure impulse mouth is communicated with said the 4th reversal valve (V5).
3. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 2; It is characterized in that: said first reversal valve (V2) and second reversal valve (V3) are formed the first coordinated type reversal valve group (GV1) that is controlled by said arithmetic facility, and said 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 said arithmetic facility.
4. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 3; It is characterized in that: have on the said trunk line and be positioned at first of large aperture orifice plate (B1) entrance location dead ahead and adopt and press second of hole (1), dead astern, exit position to adopt to press hole (2); Have on the said branch pipe(tube) and be positioned at the 3rd of small-bore orifice plate (B2) entrance location dead ahead and adopt and press the 4th of hole (3), dead astern, exit position to adopt to press hole (4); The impulse mouth of said first pressure transducer (P1) is adopted through said first and is pressed hole (1) to be communicated with the import of said large aperture orifice plate (B1); The import of said large aperture orifice plate (B1) is adopted through said first and is pressed hole (1), outlet to adopt through said second to press hole (2) to be communicated with the right import of said reversal valve respectively; The impulse mouth of said second pressure transducer (P2) is adopted through the said the 3rd and is pressed hole (3) to be communicated with the import of said small-bore orifice plate (B2), and the import of said small-bore orifice plate (B2) is adopted through the said the 3rd and pressed hole (3), exports and adopt pressure hole (4) through the said the 4th and be communicated with the left import of said reversal valve respectively.
5. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 4; It is characterized in that: said first adopts that to press hole (1) to be opened at a distance of said large aperture orifice plate (B1) be on the position of electrical path length in ten times of trunk lines; Said second adopts that to press hole (2) to be opened at a distance of said large aperture orifice plate (B1) be on the position of electrical path length in five times of trunk lines; The said the 3rd adopts that to press hole (3) to be opened at a distance of said small-bore orifice plate (B2) be on the position of electrical path length in ten times of branch pipe(tube)s, and the said the 4th adopts that to press hole (4) to be opened at a distance of said small-bore orifice plate (B2) be on the position of electrical path length in five times of branch pipe(tube)s.
6. staged spectacle plate differential pressure fluid flow rate measurement apparatus according to claim 5; It is characterized in that: said 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), filtrator (V11), reduction valve (V7) and tensimeter (P3) are installed successively on the said gas source pipe; The another port of said gas source pipe is communicated with the air intake opening of first solenoid valve (V8), second solenoid valve (V9) and the 3rd solenoid valve (V10) that are controlled by said arithmetic facility respectively; The exhausr port of said first solenoid valve (V8), 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 said first solenoid valve (V8) is communicated with the control mouth of said shut-off valve (V1); The gas outlet of said second solenoid valve (V9) is communicated with the control mouth of the said first coordinated type reversal valve group (GV1); The gas outlet of said the 3rd solenoid valve (V10) is communicated with the control mouth of the said second coordinated type reversal valve group (GV2), and said first solenoid valve (V8), second solenoid valve (V9) and the 3rd solenoid valve (V10) are the two position three-way valve of closed type.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220096548 CN202453012U (en) | 2012-03-14 | 2012-03-14 | Multi-step dual-pore plate differential pressure fluid flow measurement device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220096548 CN202453012U (en) | 2012-03-14 | 2012-03-14 | Multi-step dual-pore plate differential pressure fluid flow measurement device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620786A (en) * | 2012-03-14 | 2012-08-01 | 广州飞机维修工程有限公司 | Cascade-type double-orifice-plate differential pressure fluid flow measuring device and measuring method thereof |
| CN111677600A (en) * | 2020-06-08 | 2020-09-18 | 西安航天动力研究所 | Method for accurately controlling blowing pressure of floating ring of multi-start rocket engine |
-
2012
- 2012-03-14 CN CN 201220096548 patent/CN202453012U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620786A (en) * | 2012-03-14 | 2012-08-01 | 广州飞机维修工程有限公司 | Cascade-type double-orifice-plate differential pressure fluid flow measuring device and measuring method thereof |
| CN102620786B (en) * | 2012-03-14 | 2013-07-03 | 广州飞机维修工程有限公司 | Cascade-type double-orifice-plate differential pressure fluid flow measuring device and measuring method thereof |
| CN111677600A (en) * | 2020-06-08 | 2020-09-18 | 西安航天动力研究所 | Method for accurately controlling blowing pressure of floating ring of multi-start rocket engine |
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