CN102322907B - Integrated intelligent gas flow meter with double flow measuring heads - Google Patents
Integrated intelligent gas flow meter with double flow measuring heads Download PDFInfo
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- CN102322907B CN102322907B CN2011101275845A CN201110127584A CN102322907B CN 102322907 B CN102322907 B CN 102322907B CN 2011101275845 A CN2011101275845 A CN 2011101275845A CN 201110127584 A CN201110127584 A CN 201110127584A CN 102322907 B CN102322907 B CN 102322907B
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Abstract
The invention provides an integrated intelligent gas flow meter with double flow measuring heads. The integrated intelligent gas flow meter comprises a measuring tube, wherein flanges are respectively arranged at two ends of the measuring tube, an ultrasonic vortex flow measuring head and a V-shaped tapered flow measuring head are arranged in the measuring tube, a flow control and display unit is also arranged at the outer side of the measuring tube, and is composed of a measurement switching unit and a flow measuring and controlling unit, the measurement switching unit is connected with the flow measuring and controlling unit to form a closed loop, detecting signals of the ultrasonic vortex flow measuring head and the V-shaped tapered flow measuring head are input to the flow measuring and controlling unit after being switched and controlled by the measurement switching unit, and the flow measuring and controlling unit is used for sending a switching control signal to the measurement switching unit according to the detecting signals. The flow meter provided by the invention has the advantages of a wide flow detecting range between 0.3m/s and 30m/s, smaller interference for the signals and obviously increased measurement accuracy.
Description
The art field
The present invention relates to a kind of flowmeter of measuring fluid flow, especially a kind of multi-functional, wide-range integral intelligent gas meter of double fluid amount measuring head.
Background technology
At coal industry; The methane gas flow measurement is the work that technical difficulty is bigger, particularly under mine, because the pressure of methane gas is lower; Be to be in negative pressure state in the time of most of; And the fluctuations in discharge scope of gas is bigger, therefore not only requires to have higher sensitivity and stable low flow speed characteristic for flowmeter, also requires to have the very wide range ability and the lower pressure loss; And owing in methane gas, also contain a certain proportion of moisture content and dust, therefore also require flowmeter to have higher reliability and preferably to the adaptive faculty at scene.
Be used for rock gas, oxygen, nitrogen, pressurized air etc. are measured employed gas meter in the industry-by-industry at present; Usually can only measure a certain section fixing scope; Like the low fluid-velocity survey meter of 0.3m/s ~ 7m/s or the high flow rate meter of 8m/s ~ 30m/s, yet when in the colliery, measuring gas flow, these flowmeters are because to measure range narrower; Can not reach measurement requirement, therefore be difficult to obtain satisfied effect methane gas.
Summary of the invention
To above-mentioned deficiency of the prior art, fundamental purpose of the present invention is to solve the narrower problem of present gas flow meter sensing range, and an a kind of double fluid measurement amount integrated intelligent gas flowmeter with broad sensing range is provided.
Technical scheme of the present invention: a double-current measurement amount integrated intelligent gas flowmeter; Comprise measuring tube; Be respectively equipped with the flange that is used to connect tested pipeline at the measuring tube two ends; It is characterized in that; In measuring tube, be provided with ultrasonic flux of vortex street measuring head and V-arrangement coning tower tray amount measuring head, also be provided with the flow control display unit in the outside of measuring tube, said flow control display unit is to be made up of measurement switch unit that is connected to form closed loop and flow measuring and controlling unit; The detection signal of ultrasonic flux of vortex street measuring head and V-arrangement coning tower tray amount measuring head all is input to the flow measuring and controlling unit after measuring the switch unit switching controls, the flow measuring and controlling unit sends switch-over control signal according to said detection signal to measuring switch unit;
Said V-arrangement coning tower tray amount measuring head is connected the negative pressure induction end of differential pressure pick-up through the negative pressure pressure pipe that is communicated with measuring tube; The malleation induction end of differential pressure pick-up is communicated with measuring tube through malleation pressure pipe, and the output terminal of differential pressure pick-up connects the input of measuring switch unit;
The spacing of said ultrasonic flux of vortex street measuring head and V-arrangement coning tower tray amount measuring head is 0.8 to 1.2 times of measuring tube pipe diameter length.
Further technical scheme also is provided with pressure transducer on the inwall of measuring tube, on malleation pressure pipe, also is provided with temperature sensor, and the output of said pressure transducer and temperature sensor all is connected to the input of measuring switch unit.
Flowmeter of the present invention is organically combined traditional ultrasonic flux of vortex street measuring head and V-arrangement coning tower tray amount measuring head; Also combine the temperature and pressure signal simultaneously; With temperature sensor, pressure transducer, differential pressure pick-up and ultrasonic sensor and measurement switch unit and flow measuring and controlling unit combination is one; Constitute the integral intelligent flowmeter that has double fluid amount measuring head and can measure the multiple gases parameter, thereby realized (the detection of 0.3m/s ~ 30m/s) of wide-range gas flow.
Further technical scheme, said ultrasonic flux of vortex street measuring head is located at the front end of measuring tube, and V-arrangement coning tower tray amount measuring head is located at the rear end of measuring tube, and ultrasonic flux of vortex street measuring head equates with the pipe diameter length of measuring tube with the spacing of V-arrangement coning tower tray amount measuring head.Here carry out ultrasound examination earlier; The purpose of carrying out the differential pressure detection again is to avoid two kinds of fluids between the measuring head to produce interference; And because ultrasound examination sensitivity is higher; And the stability that differential pressure signal detects is better, the detection of therefore hanging down flow velocity earlier, and the detection of carrying out high flow rate again helps improving accuracy of detection.
Further technical scheme again, said temperature sensor is positioned at the rear end of negative pressure pressure pipe, and with the spacing of negative pressure pressure pipe be 0.5 to 1 times of measuring tube pipe diameter length.
Flowmeter of the present invention calculates according to following method when the measurement gas flow:
More than in two formulas:
Q
1The volumetric flow rate of-ultrasonic flux of vortex street measuring head detection, m
3/ h;
Q
2The volumetric flow rate that-V-arrangement coning tower tray amount measuring head detects, m
3/ h;
The frequency of f-vortex flowmeter signals, Hz;
The instrument coefficient of K-flux of vortex street measuring head, L
-1
The efflux coefficient of C-V-arrangement coning tower tray amount measuring head;
The equivalent area ratio of β v-V-arrangement coning tower tray amount measuring head;
d
VThe equivalent bore size of-V-arrangement coning tower tray amount measuring head, mm;
The expansibility factor of ε-gas;
The differential pressure value of Δ P-V-arrangement coning tower tray amount measuring head output, Pa;
Density under ρ-gas duty, kg/m
3
With respect to prior art, the present invention has following beneficial effect:
1, the present invention has adopted two kinds of flow measurement heads that flow speed characteristic is different, and a kind of is the ultrasonic preferably flux of vortex street measuring head of the more high and low flow phase characteristic of sensitivity, and it can realize that flow velocity is from the interval flow measurement of 0.3m/s～9m/s; Another kind is the V-arrangement awl differential flow measuring head that the high flow phase characteristic is better, output is stable, the pressure loss is less, therefore can also realize the flow measurement of flow velocity from 7m/s～30m/s interval; Also being provided with measurement switch unit and flow measuring and controlling unit simultaneously comes two kinds of measuring heads are made up and switching controls; Two kinds of problems that measuring head is incompatible have been solved; And realized the optimization selection of signal; Thereby make flowmeter of the present invention have the wide flow detection scope of 0.3m/s ~ 30m/s, the range ratio of flowmeter can reach 100:1.
2, among the present invention be the signal phase mutual interference that prevents to be installed in two kinds of flow measurement heads in the same measuring tube; Therefore the ultrasonic vortex street measuring head that will measure low flow velocity is located at the upstream side of measuring tube; The V-arrangement awl measuring head of measuring high flow rate is located at the downstream of measuring tube; And distance between the two is set to 0.8D～1.2D (D is the internal diameter of measuring tube), has so just solved the problem that is easy to generate interference between two measuring heads.
3, the present invention is through measuring the static pressure of fluid at the malleation pressure pipe place setting pressure sensor of V-arrangement awl; Measure the temperature of fluid at mounting temperature sensor on the measurement tube wall in the downstream of negative pressure pressure pipe 0.5D～1.0D; And the compensation of the pressure and temperature during as the Fluid Computation flow, thereby improved measuring accuracy with pressure, temperature signal.
4, the flow measuring and controlling unit among the present invention can be according to the situation of change of the flow signal in the measuring process; Automatically judge and switch and select the flow measurement head of suitable current state; Obtain the optimal flow rate detection signal with this, and keep two flow measurement heads all to be operated in the flowrate optimization scope that sets.
Description of drawings
Fig. 1 is the structured flowchart of the present invention's double fluid measurement amount integrated intelligent gas flowmeter;
Fig. 2 is the structural representation of the present invention's double fluid measurement amount integrated intelligent gas flowmeter.
Among the figure, 1-measuring tube, 2-flange, 3-ultrasonic flux of vortex street measuring head; 4-V-arrangement coning tower tray amount measuring head, 5-flow control display unit, 51-measurement switch unit; 52-flow measuring and controlling unit, 6-negative pressure pressure pipe, 7-differential pressure pick-up; 8-malleation pressure pipe, 9-pressure transducer, 10-temperature sensor.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
As depicted in figs. 1 and 2; A double-current measurement amount integrated intelligent gas flowmeter of the present invention; Comprise measuring tube 1, be respectively equipped with flange 2 at measuring tube 1 two ends, measuring tube 1 is to be used for for detected fluid mobile passage being provided; During installation the flange 2 of measuring tube 1 through two ends is communicated with the tested pipeline that is positioned at two ends respectively, among the present invention the caliber of measuring tube 1 represented with D; Front end at measuring tube 1 inner chamber is provided with ultrasonic flux of vortex street measuring head 3; Be provided with V-arrangement coning tower tray amount measuring head 4 in the rear end of measuring tube 1 inner chamber, the spacing between said ultrasonic flux of vortex street measuring head 3 and the V-arrangement coning tower tray amount measuring head 4 is 0.8D, 0.9D, D, 1.1D or 1.2D, and the purpose of controlling ultrasonic flux of vortex street measuring head 3 and V-arrangement coning tower tray amount measuring head 4 spacings here is to prevent that the gas that flows between two measuring heads from producing interference and influence; The selection of spacing can be decided according to on-the-spot gas velocity; But spacing should not exceed the 1.2D scope, and purpose is to make two measuring heads can non-interference, can make again its near; Reduce error, and ensure the accuracy of flowmeter.Among the present invention; Ultrasonic flux of vortex street measuring head 3 is existing equipment with V-arrangement coning tower tray amount measuring head 4; Ultrasonic flux of vortex street measuring head 3 is to utilize ultrasound wave to come the detected gas flow; V-arrangement coning tower tray amount measuring head 4 is to calculate gas flow through the induction pressure difference, in the present invention, and for the signal that makes two kinds of measuring heads can also be provided with flow control display unit 5 in the outside of measuring tube 1 by comprehensive utilization; Said flow control display unit 5 is to be made up of measurement switch unit that is connected to form closed loop 51 and flow measuring and controlling unit 52; The detection signal of ultrasonic flux of vortex street measuring head 3 and V-arrangement coning tower tray amount measuring head 4 all is input to measures switch unit 51, after measurement switch unit 51 carries out switching controls to the received signal, wherein one road signal of selecting is input to flow measuring and controlling unit 52; After flow measuring and controlling unit 52 pairs of signal amplifications, demodulation, filtering and shapings, carry out flow rate calculation and demonstration again; When carrying out flow rate calculation; Flow measuring and controlling unit 52 can be analyzed and contrast the detection signal that is obtained; Judge whether it is a road best detection signal; If not then sending switch-over control signals to measuring switch unit 51, control survey switch unit 51 switches and the detection signal on another road is inputed to flow measuring and controlling unit 52, and with this cycling.Among the present invention; Through flow control display unit 5 the two-way measuring-signal has effectively been carried out comprehensively, and realized Intelligence Selection, can both detect accurately the gas of different phase flow velocity; Make the flow signal that obtains can reflect the gas time of day, the result is also more accurate.
Referring to Fig. 2; When V-arrangement coning tower tray amount measuring head 4 is installed; It is the negative pressure induction end that V-arrangement coning tower tray amount measuring head 4 is connected differential pressure pick-up 7 through the negative pressure pressure pipe 6 that is communicated with measuring tube 1; The malleation induction end of differential pressure pick-up 7 is communicated with measuring tube 1 through malleation pressure pipe 8, and the output terminal of differential pressure pick-up 7 is connected in the input of measuring switch unit 51, like this differential pressure signal of V-arrangement coning tower tray amount measuring head 4 outputs; Converted to electric signal by differential pressure pick-up 7, and be input to 52 calculating of flow measuring and controlling unit and demonstration through measuring switch unit 51.
Referring to Fig. 1 and Fig. 2, on the inwall of measuring tube 1, also be provided with pressure transducer 9, on malleation pressure pipe 8, also be provided with temperature sensor 10, the output of said pressure transducer 9 and temperature sensor 10 all is connected to the input of measuring switch unit 51.Collection through pressure boost and temperature parameter; Flow measuring and controlling unit 52 can obtain more parametric compensation when the Fluid Computation flow; And can show the parameters such as pressure and temperature of instantaneous delivery, integrated flux, the fluid of fluid, conveniently obtain more comprehensively, accurate data.
When temperature sensor 10 is set; Consider the temperature of wanting truly to measure fluid, but can not produce flow interfering, therefore temperature sensor 10 is located at the position of negative pressure pressure pipe 6 rear ends and negative pressure pressure pipe 6 spacing 0.5D the flow measurement head; According to the actual flow size; Also can be located at the position of 0.6D, 0.8D or 1D, but should not surpass 1D, otherwise can influence the accuracy of detected temperatures data.
Flowmeter of the present invention is employed in the low ultrasonic preferably flux of vortex street measuring head of flow phase characteristic, and measurable flow speed is the interval gas flow of 0.3m/s～9m/s, and its sensitivity is higher; Be employed in high flow phase characteristic V-arrangement coning tower tray amount measuring head preferably again, measurable flow speed is the interval fluid flow of 7m/s～30m/s, and has stable output signal, the less characteristic of the pressure loss; Adopt flow control display unit to control the signal of selecting two measuring heads again with switching control function; Thereby realized the flow detection of wide measurement range; Solved current flux instrumentation weight range narrower with the lower problem of precision, in particular for the detection of coal-mine gas a kind of reliable detection equipment is provided.
Claims (4)
1. a double-current measurement amount integrated intelligent gas flowmeter; Comprise measuring tube (1); Be respectively equipped with the flange (2) that is used to connect tested pipeline at measuring tube (1) two ends; It is characterized in that; In measuring tube (1), be provided with ultrasonic flux of vortex street measuring head (3) and V-arrangement coning tower tray amount measuring head (4); Also be provided with flow control display unit (5) in the outside of measuring tube (1); Said flow control display unit (5) is to be made up of the measurement switch unit (51) that is connected to form closed loop and flow measuring and controlling unit (52), and the detection signal of ultrasonic flux of vortex street measuring head (3) and V-arrangement coning tower tray amount measuring head (4) all is input to flow measuring and controlling unit (52) after measuring switch unit (51) switching controls, and flow measuring and controlling unit (52) are sent switch-over control signal according to said detection signal to measuring switch unit (51);
Said V-arrangement coning tower tray amount measuring head (4) is connected the negative pressure induction end of differential pressure pick-up (7) through the negative pressure pressure pipe (6) that is communicated with measuring tube (1); The malleation induction end of differential pressure pick-up (7) is communicated with measuring tube (1) through malleation pressure pipe (8), and the output terminal of differential pressure pick-up (7) connects the input of measuring switch unit (51);
The spacing of said ultrasonic flux of vortex street measuring head (3) and V-arrangement coning tower tray amount measuring head (4) is 0.8 to 1.2 times of measuring tube (1) pipe diameter length.
2. a double-current measurement amount integrated intelligent gas flowmeter according to claim 1; It is characterized in that; On the inwall of measuring tube (1), also be provided with pressure transducer (9); On malleation pressure pipe (8), also be provided with temperature sensor (10), the output of said pressure transducer (9) and temperature sensor (10) all is connected to the input of measuring switch unit (51).
3. a double-current measurement amount integrated intelligent gas flowmeter according to claim 1 and 2; It is characterized in that; Said ultrasonic flux of vortex street measuring head (3) is located at the front end of measuring tube (1); V-arrangement coning tower tray amount measuring head (4) is located at the rear end of measuring tube (1), and ultrasonic flux of vortex street measuring head (3) equates with the pipe diameter length of measuring tube (1) with the spacing of V-arrangement coning tower tray amount measuring head (4).
4. a double-current measurement amount integrated intelligent gas flowmeter according to claim 2; It is characterized in that; Said temperature sensor (10) is positioned at the rear end of negative pressure pressure pipe (6), and with the spacing of negative pressure pressure pipe (6) be 0.5 to 1 times of measuring tube (1) pipe diameter length.
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| CN102322907B true CN102322907B (en) | 2012-10-31 |
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| US11415442B2 (en) | 2020-10-30 | 2022-08-16 | Honeywell International Inc. | Ultrasonic flow tube having a plurality of outer pipes surrounding a center pipe positioned between an inlet wall and an outlet wall having transducers therein |
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Application publication date: 20120118 Assignee: Liupanshui Mei Ansen technology limited liability company Assignor: Chongqing MAS Sci & Tech Co., Ltd. Contract record no.: 2014500000010 Denomination of invention: Integrated intelligent gas flow meter with double flow measuring heads Granted publication date: 20121031 License type: Exclusive License Record date: 20140512 |
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