CN101629837A - Liquid turbine flow meter and flow measuring method thereof - Google Patents
Liquid turbine flow meter and flow measuring method thereof Download PDFInfo
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Abstract
The invention relates to a liquid turbine flow meter and a flow measuring method thereof. The liquid turbine flow meter comprises a flow meter body, a rectifier, a turbine flow meter, a flow totalizer, a display device and a power supply part, wherein the flow meter body is provided with a liquid inlet, an outlet and a detection interface; the rectifier and the turbine flow meter are sequentially arranged in the flow meter body from the liquid inlet, and the turbine flow meter comprises a turbine and a sensor; the flow totalizer is arranged outside the detection interface and connected with the sensor; and the display device and the power supply part are connected with the flow totalizer. The flow measuring method comprises the following steps: processing, amplification, A/D conversion and counting are carried out on pulse signals generated by a rotating impeller after entering the flow totalizer to, obtain a primary flow signal; amplification and A/D conversion are carried out on a temperature signal measured by a temperature sensor, and the primary flow signal is corrected by selecting different temperature compensation models to obtain a secondary flow signal; and a secondary correction is carried out by utilizing a multi-segment nonlinear correction method to obtain the final flow signal. In the invention, the rectifier and the flow meter body are integrated, therefore, the liquid turbine flow meter has small structural volume and can guarantee the accuracy of measurement through temperature compensation.
Description
Technical field
The present invention relates to a kind of liquid flowmeter and flow metering method thereof, relate in particular to a kind of liquid turbine flowmeter and flow metering method thereof.
Background technology
The flowmeter that petrochemical system is commonly used mainly is volumeter and velocity flowmeter at present.
When volumeter is measured full-bodied fluid, has higher measuring accuracy.Its principle of work is the flow that will flow through in the pipeline, continuously measures with the metric space with orthobaric volume, according to the volumetric values of this orthobaric volume and the cumulative frequency of continuous coverage, obtains the integrated flux by this flowmeter.During volumeter measurement volumes flow, be not subjected to the influence of fluid density and viscosity, flow state and velocity distribution are not had specific (special) requirements.But the cleanliness factor of its convection cell is had relatively high expectations, because it is to measure flow with the metric space with standard volume, so volume ratio is huger, is not suitable for the liquid meter under the big flow.
Velocity flowmeter commonly used has turbo flow meter, vortex shedding flow meter, electromagnetic flowmeter, ultrasonic flow meter etc.Turbo flow meter is to utilize fluid to flow to promote the impeller rotation, and flow rate of fluid is directly proportional with the angular velocity of rotation of impeller, by measuring the angular velocity of rotation of impeller, just can obtain flow rate of fluid, thereby obtains flow in the pipeline.It has the advantages that volume is little, in light weight, range ratio is wide, conformability is strong.But existing turbo flow meter, rectification body and flowmeter split setting can not reach good steady flow result, and existing turbo flow meter do not take into full account the influence of objective factor, thereby flow metering is not accurate enough.
Summary of the invention
Technical matters to be solved by this invention provides a kind of liquid turbine flowmeter and flow metering method thereof, the integrated structure of rectifier and flowmeter bodies, change the mode that conventional rectifier is separated with flowmeter, and real-time temperature compensation and multi-segment nonlinear correction are set, make flow metering more accurate.
To achieve these goals, the invention provides a kind of liquid turbine flowmeter, it is characterized in that, comprising:
Flowmeter bodies has liquid inlet, liquid outlet and pick-up interface;
Rectifier is arranged in the described flowmeter bodies, comprises many tubules, and described rectifier has fluid inlet end and liquid outlet end, and the fluid inlet end of described rectifier is positioned at the place, liquid inlet of described flowmeter bodies;
Turbo flow meter, it is interior and relative with described rectifier liquid outlet end to be fixedly installed on described flowmeter bodies, described turbo flow meter comprises turbine, sensor, and described sensor and described pick-up interface are oppositely arranged, and described sensor comprises pulse transducer and temperature sensor;
Flow integrator is arranged on the outer described detector interface of described flowmeter bodies and connects described sensor, the signal that receiving sensor is gathered, and described flow integrator comprises again:
The flow arithmetic element, the pulse signal union that receives described pulse transducer is handled;
Temperature compensation unit receives the temperature signal of described temperature sensor and real-Time Compensation because the temperature-induced variations amount;
Display device connects the result data that described flow integrator also shows the exclusive disjunction of monitoring;
Power supply connects described flow integrator.
Above-mentioned liquid turbine flowmeter, wherein, described temperature compensation unit comprises again: be used for directly monitoring the monitoring modular of described fluid temperature, and be used for temperature compensation module according to the temperature compensation of different liquids temperature volume factor real-time online.
Above-mentioned liquid turbine flowmeter, wherein, described flow integrator also comprises information transmission unit, described information transmission unit comprises pulse signal output end mouth, 4～20mA analog signal output mouth and RS-485 PORT COM again.
Above-mentioned liquid turbine flowmeter, wherein, described flow integrator is the little power consumption integrated chip of TMCS-90S-D type series.
Above-mentioned liquid turbine flowmeter, wherein, described flow integrator also comprises the multi-segment nonlinear amending unit, is used to revise the error of described turbo flow meter.
Above-mentioned liquid turbine flowmeter, wherein, the rotor of described turbine is provided with 6 helical blades, and blade tilt is 35 °, and the blade degree of overlapping is between 0.7～1.1.
Above-mentioned liquid turbine flowmeter, wherein, many tubules of described rectifier setting are stainless-steel tube, its quantity is one of in 19,21,35 or 42.
Above-mentioned liquid turbine flowmeter, wherein, described power supply comprises built-in 3.6V lithium battery and external power supply DC12～24V transformer.
Above-mentioned liquid turbine flowmeter, wherein, the top of described flowmeter bodies is tiltedly installed with protective cover, and described flow integrator, described power supply are fixedly installed in the described protective cover, and described display device is arranged on the described protective cover.
Above-mentioned liquid turbine flowmeter, wherein, described flowmeter bodies is a cylindrical housings, and the two-port place is provided with outer link slot respectively, and described flowmeter bodies bottom is provided with leg, and the top is provided with handle.
To achieve these goals, the present invention also provides a kind of flow metering method that is applied to above-mentioned liquid turbine flowmeter, it is characterized in that, comprises step:
Step 100, the output after described rectifier rectification, the compression of described rectification body are again through described turbo flow meter monitoring of the liquid of conveying;
Step 110, the pulse transducer on the described turbo flow meter is sent to described integrating instrument microprocessor with liquid through the pulse signal that produces;
Step 120, described integrating instrument microprocessor draws an elementary flow signal with the pulse signal that receives behind amplification, A/D conversion, counting;
Step 130, described temperature sensor is sent to described integrating instrument processor with the temperature signal of gathering;
Step 140, described integrating instrument processor is changed the temperature signal that receives through amplification, A/D, choose different model of temperature compensation, and described elementary flow signal correction is obtained the two_stage flow signal;
Step 160, output and storage flow signal.
The flow metering method of above-mentioned liquid turbine flowmeter wherein, also comprises step 150 after the described step 140, and described two_stage flow signal is carried out the interval judgement in flow in-scope interval, chooses different flow instrument coefficients and carries out the secondary correction.
The flow metering method of above-mentioned liquid turbine flowmeter, wherein, described model of temperature compensation comprises: the model of temperature compensation of diesel oil, jet fuel oil and gasoline, described temperature compensation are that benchmark converts with 20 ℃, and computing formula is: V
20=V
t[1-f (t-20)]
In the formula, V
20: be 20 ℃ of volumes of oil product; V
t: be oil product t ℃ volume;
F: be oil product temperature volume factor; T: be the oil transportation actual temperature.
The flow metering method of above-mentioned liquid turbine flowmeter, wherein, described flow instrument coefficient is formulated as K=f/q
v
In the formula, K: the instrument coefficient that is called flowmeter for scale-up factor;
F: be the pulsed frequency of turbo flow meter;
q
v: be flow by flowmeter.
The flow metering method of above-mentioned liquid turbine flowmeter wherein, also comprises step 170, the result of demonstration/output computing or the result data of at-once monitor.
Technique effect of the present invention is: liquid turbine flowmeter adaptive temperature scope of the present invention compares broad, be used for the metering of light-end products, the integrated structure of rectifier and flowmeter bodies, changed the mode that existing rectifier separates with flowmeter, compact conformation, dependable performance, volume is little, in light weight, uses very conveniently, has solved when carrying oil product under the complicated fluidised form the accurately problem of metering.Bulk temperature Changing Pattern by having taken into full account liquid and viscosity are to the influence factor of instrument coefficient, set up the model of temperature compensation of different oil products, determine temperature compensation coefficient and multi-segment nonlinear modification method, guaranteed the consistance and the accuracy of flowmeter metering.Enter the liquid of flowmeter, rectifier carries out smooth to fluidised form, has effectively prevented the impact of flow rate fluctuation to flowmeter.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is a structural drawing of the present invention;
Fig. 2 is the side view of Fig. 1;
Fig. 3 a is first kind of embodiment structural representation of rectifier;
Fig. 3 b is second kind of embodiment structural representation of rectifier;
Fig. 3 c is the third embodiment structural representation of rectifier;
Fig. 3 d is the 4th kind of embodiment structural representation of rectifier;
Fig. 4 is a turbo flow meter workflow diagram of the present invention.
Wherein, Reference numeral
1 flowmeter bodies, 2 rectifiers
21 rectifier tubules, 3 big spacers
4 left side supportings, 5 major axis
Spacer 7 turbines before 6
Spacer in 71 turbo blades 8
9 intelligent integral-counting instruments, 10 pick-up interfaces
11 right supporting 12 bearing supports
13 bearings, 14 sensors
15 outer link slot 16 protective covers
17 displays, 18 legs
19 handles, 20 gauge outfit fixed covers
A liquid inlet B liquid outlet
Output of C signal and storage
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and principle of work are done concrete description:
See also Fig. 1, Fig. 2 structural drawing of the present invention.
The specific embodiment of the present invention as shown in the figure, the present invention discloses a kind of liquid turbine flowmeter, comprising: flowmeter bodies 1, rectifier 2, turbo flow meter, flow integrator 9, display device 17 and power supply.
As shown in Figure 1, flowmeter bodies 1 has liquid inlet A, liquid outlet B and detector interface 10; Rectifier 2 comprises the many tubules 21 that are arranged in the flowmeter bodies, and rectifier 2 has fluid inlet end and liquid outlet end, and the fluid inlet end of rectifier is positioned at the A place, liquid inlet of flowmeter bodies.Turbo flow meter is fixedly installed in the flowmeter bodies and with respect to rectifier liquid outlet end, turbo flow meter comprises turbine 7, sensor 14, and sensor 14 corresponding pick-up interfaces 10 are provided with, and sensor 14 comprises pulse transducer and temperature sensor again.Flow integrator 9, be arranged on the outer detector interface 10 of flowmeter bodies, and connection sensor 14, the signal that receiving sensor 14 is gathered, flow integrator 9 adopts the little power consumption integrated chip of TMCS-90S-D type series, comprise in this little power consumption integrated chip: flow arithmetic element, temperature compensation unit and multi-segment nonlinear amending unit, temperature compensation unit comprises again, be used for the monitoring modular of direct monitoring liquid temperature, and be used for temperature compensation module according to the temperature compensation of different liquids temperature volume factor real-time online.Display 17 connection traffic integrating instruments 9 are used to show the result data of the exclusive disjunction of monitoring.
The fixed form of turbine 7 is, with about support 4,11 inwalls that are fixed in flowmeter bodies 1 respectively by the bearing support 12 of multijaw, the two ends of one major axis 5 are individually fixed in left side supporting 4 and the right supporting 11, turbine 7 is set on the major axis 5 by pair of bearings 13, spacer 8 in being provided with between the bearing of the left and right sides, spacer 6 before also being provided with between the front end of left bearing 13 and the left side supporting 4.
Also be provided with big spacer 3 on the flowmeter bodies inwall between rectifier 2 and the left side supporting 4.
Liquid is through many tubule rectifications of rectifier 2, and the bearing support through left side supporting 4 acts on the impeller uniformly again.
The flowmeter rotor portion adopts rolling structure, between turbine 7 and the major axis 5 rolling bearing 13 is set, when liquid promotes turbo blade 71 rotations, can drive the overcoat rotation of turbine 7 and rolling bearing 13, the ball of rolling bearing 13 also rotates, and the interior cover of rolling bearing 13 is static, thereby guarantees that major axis 5 does not rotate, and reaches the effect of friction.
When flow of liquid during, under the effect of rectifier baffle, obtain rectification and quicken through sensor.Because turbo blade and flow direction are angled, under the accelerating fluid effect, the impeller moment that rotates, behind overcome friction square and the fluid resistance square, turbine begins rotation, in the certain flow scope, secondary speed is directly proportional with fluid volume flow, impeller rotation cutting magnetic line, change the magnetic flux in the coil periodically, make the coil two ends induce the pulse signal that is directly proportional with fluid volume flow, this signal is sent into the flow arithmetic element of little power consumption integrated chip and is carried out calculation process after amplification, filtering, shaping, and is shown on the display 17.
Temperature compensation unit, the temperature signal of receiving sensor and real-Time Compensation are because the temperature-induced variations amount.The volume of fluid changes with variation of temperature, and in general, temperature raises, volumetric expansion.This attribute of fluid is called thermal expansivity, represents with coefficient of thermal expansion.Different fluid has different expansivitys.
The temperature sensor of turbo flow meter adopts high-precision Pt1000 thermopair, can accurately measure the temperature of carrying liquid.Can carry out (every interval 4s) temperature compensation continuously according to the temperature that records.
The fluid of pipe laying system oil transportation mainly contains three kinds of gasoline, jet fuel and diesel oil.When carrying different fluid, should adopt different volume-temperature coefficients.
For gasoline, when density was 0.710-0.730, the temperature volume factor was 0.00123-0.00115.Can average 0.00119 during calculating.
For jet fuel, when density was 0.775-0.790, the temperature volume factor was 0.00099-0.00095, can average 0.00097 during calculating.
For diesel oil, when density was 0.800-0.830, the temperature volume factor was 0.00089-0.00084.Can average 0.000865 during calculating.
With 20 ℃ is that benchmark converts computing formula: V
20=V
t[1-f (t-20)]
Below by example, calculate the volume change of different liquids when 1 ℃ of the every rising of temperature.
For diesel oil, when density was 0.83, the temperature volume factor was 0.00084,
When temperature raises 1 ℃ the time, volume change is 0.84 ‰, if 10 ℃ of temperature variation will cause 0.84% error in dipping.
For jet fuel, when density was 0.780, the temperature volume factor was 0.00098,
When temperature raises 1 ℃ the time, volume change is 0.981 ‰, if 10 ℃ of temperature variation will cause 0.981% error in dipping.
For gasoline, when density was 0.710, the temperature volume factor was 0.00123,
When temperature raises 1 ℃ the time, volume change is 1.232 ‰, if 10 ℃ of temperature variation will cause 1.232% error in dipping.
Can find out from result of calculation, when gasoline feed, temperature is very big to the influence of volume, when 10 ℃ of temperature variation, can cause 1.232% error in dipping, and the metering of general flowmeter accurately all can reach 0.5%, existing liquid turbine flowmeter, only from improving the precision of instrument, and do not consider that fluid to be measured variation of temperature thereby the measurement result that obtains are inaccurate, can not satisfy the requirement of metering handing-over.The purpose of temperature compensation of the present invention be exactly will the actual measurement oil product flow value convert to can be for the flow value under the standard temperature condition (is benchmark with 20 ℃) of metering handing-over.Specifically, be exactly the built-in cubical expansivity of gasoline, jet fuel and diesel oil in little power consumption integrated chip, by the change-over switch that is provided with, can carry out temperature compensation when carrying different oil product.
Adopted the multi-segment nonlinear correction in little power consumption integrated chip that the present invention adopts, turbo flow meter belongs to velocity flowmeter, and in certain flow range, to certain fluid media (medium) viscosity, the anglec of rotation of turbine is directly proportional with the flow velocity of liquid.The pulsed frequency of turbo flow meter output is directly proportional with the flow by flowmeter, and its scale-up factor K is called the instrument coefficient of flowmeter, is formulated as K=f/q
vIn the formula, f is the pulsed frequency of turbo flow meter, q
vBe flow by flowmeter.Flow integrator of the present invention carries out interpolation arithmetic to the instrument coefficient of non-calibrating point, to adopting different instrument coefficients under the different operating modes, has improved the accuracy of metering during computing.
Flow integrator also comprises information transmission unit, realizes information transfer capability, and information transmission unit comprises pulse signal output end mouth, 4～20mA analog signal output mouth and RS-485 PORT COM.
Power supply can adopt built-in 3.6V lithium battery or connect external power source by external power supply DC12～24V transformer.
As shown in Figure 1 and Figure 2; the top of flowmeter bodies 1 is tiltedly installed with protective cover 16; flow integrator is fixed on protective cover 16 and the pick-up interface 10 by gauge outfit fixed cover 20, and power supply is fixedly installed in the protective cover 16, and display device 17 is arranged on the protective cover 16.
Physical dimension of the present invention (length * wide * height) mm:600 * 220 * 380
Weight kg:38
Bore mm:150
Rated pressure MPa:4.0.
See also Fig. 2, as shown in the figure, turbine 7 of the present invention is made by the magnetic stainless steel material, and helical blade 71 is housed, and the number of blade is 6, and blade tilt is 35 °, and the blade degree of overlapping is between 0.7～1.1.
See also Fig. 3 a, Fig. 3 b, Fig. 3 c and Fig. 3 d different embodiment structural representations for rectifier of the present invention.
The velocity distribution of turbo flow meter characteristic and pipeline system has very big relation, ensures that therefore the fluid that enters flowmeter has even velocity and distributes, and is an important prerequisite condition that improves metering accuracy.The rectifier that liquid turbine flowmeter provided by the invention is built-in is made up of many stainless steel tubules.
First kind of embodiment, adopting 35 stainless steel tubules is a branch of rectifier.
Second kind of embodiment, adopting 21 stainless steel tubules is a branch of rectifier.
The third embodiment, adopting 19 stainless steel tubules is a branch of rectifier.
The 4th kind of embodiment, adopting 42 stainless steel tubules is a branch of rectifier.
Wherein, be the best with the 4th kind of embodiment, the length of its rectification bundle is 100mm; The interior diameter d=16mm of rectification bundle tubule, rectifier outer diameter D=150mm.
In sum, liquid turbine flowmeter provided by the invention has following characteristics:
(1) the integrated structure of rectifier and flowmeter bodies has changed the mode that existing rectifier separates with flowmeter, compact conformation, dependable performance, and volume is little, in light weight, uses very conveniently, has solved when carrying oil product under the complicated fluidised form the accurately problem of metering.
(2) rectifier inside is provided with tubulose rectification bundle, has eliminated interior velocity flow profile inequality of pipeline and the interior secondary flow of pipeline to the influence of flow measuring accuracy, has guaranteed the accuracy of metering.
(3) the flowmeter rotor portion adopts rolling structure, energy loss when having reduced the parts rotation, solve the problem of the parts galloping that the fluid power deficiency causes under the low flow rate condition, enlarged the range ability of flowmeter, helped guaranteeing the precision and the repeatability of measuring.
(4) bulk temperature Changing Pattern by having taken into full account liquid and viscosity are to the influence factor of instrument coefficient, set up the model of temperature compensation of different oil products, determine temperature compensation coefficient and multi-segment nonlinear modification method, guaranteed the consistance and the accuracy of flowmeter metering.
(5) intelligent flow-integrating instrument and temperature compensation unit can be according to different liquids temperature volume factors, and the temperature of carrying liquid can be directly monitored in the real-time online temperature compensation again.
See also Fig. 4 turbo flow meter workflow diagram of the present invention.
The present invention also discloses a kind of flow metering method of using above-mentioned liquid turbine flowmeter, comprises step:
Step 100 is exported from liquid outlet B after described rectifier rectification, the compression of described rectification body are again through described turbo flow meter monitoring from the liquid that liquid inlet A carries;
Step 110, the pulse transducer on the described turbo flow meter is sent to described integrating instrument microprocessor with liquid through the pulse signal that produces;
Step 120, described integrating instrument microprocessor draws an elementary flow signal with the pulse signal that receives behind amplification, A/D conversion, counting;
Step 130, described temperature sensor is sent to described integrating instrument processor with the temperature signal of gathering;
Step 140, described integrating instrument processor is changed the temperature signal that receives through amplification, A/D, choose different model of temperature compensation, and described elementary flow signal correction is obtained the two_stage flow signal;
Step 150 is carried out the interval judgement in flow in-scope interval to described two_stage flow signal, chooses different flow instrument coefficients and carries out the secondary correction.
Step 160, output and storage flow signal C;
Step 170, the result of demonstration/output computing or the result data of at-once monitor.
As previously mentioned, model of temperature compensation comprises: the model of temperature compensation of diesel oil, jet fuel oil and gasoline, temperature compensation are that benchmark converts with 20 ℃, and computing formula is: V
20=V
t[1-f (t-20)]
In the formula,
V
20: be 20 ℃ of volumes of oil product; V
t: be oil product t ℃ volume;
F: be oil product temperature volume factor; T: be the oil transportation actual temperature.
The flow instrument coefficient is formulated as K=f/q
v
In the formula,
K: the instrument coefficient that is called flowmeter for scale-up factor;
F: be the pulsed frequency of turbo flow meter;
q
v: be flow by flowmeter.
In sum, the metering method that the present invention discloses is the light fuel when pipeline is carried, be steady state flow by the rectification beam tube along exhibition, after preceding rectification body compression and improving kinetic energy, evenly promote the multi-disc impeller, the impeller that has angle is converted into the direct proportion rotating speed with flow velocity, light fuel through after supporting stream outflow meter.The rotary blade cutting sensor magnetic line of force of direct proportion flow velocity, the pulse signal of generation enters the integrating instrument microprocessor processes, through amplification, A/D conversion, counting, draws an elementary flow signal; The temperature signal of temperature sensor measurement is selected different model of temperature compensation for use through amplification, A/D conversion, and elementary flow signal is revised, and draws the two_stage flow signal; Utilize the multi-segment nonlinear modification method, the flow signal spacing is judged, choose different flow instrument coefficients, carry out the secondary correction, draw final flow signal.
Flow signal has three kinds of way of outputs: pulse output, RS485 output, 4-20mA output.
Liquid turbine flowmeter adaptive temperature scope of the present invention compares broad, be used for the metering of light-end products, the integrated structure of rectifier and flowmeter bodies, changed the mode that existing rectifier separates with flowmeter, compact conformation, dependable performance, volume is little, in light weight, uses very conveniently, has solved when carrying oil product under the complicated fluidised form the accurately problem of metering.Bulk temperature Changing Pattern by having taken into full account liquid and viscosity are to the influence factor of instrument coefficient, set up the model of temperature compensation of different oil products, determine temperature compensation coefficient and multi-segment nonlinear modification method, guaranteed the consistance and the accuracy of flowmeter metering.Enter the liquid of flowmeter, rectifier carries out smooth to fluidised form, has effectively prevented the impact of flow rate fluctuation to flowmeter.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (15)
1, a kind of liquid turbine flowmeter is characterized in that, comprising:
Flowmeter bodies has liquid inlet, liquid outlet and pick-up interface;
Rectifier is arranged in the described flowmeter bodies, comprises many tubules, and described rectifier has fluid inlet end and liquid outlet end, and the fluid inlet end of described rectifier is positioned at the place, liquid inlet of described flowmeter bodies;
Turbo flow meter, it is interior and relative with described rectifier liquid outlet end to be fixedly installed on described flowmeter bodies, described turbo flow meter comprises turbine, sensor, and described sensor and described pick-up interface are oppositely arranged, and described sensor comprises pulse transducer and temperature sensor;
Flow integrator is arranged on the outer described detector interface of described flowmeter bodies and connects described sensor, the signal that receiving sensor is gathered, and described flow integrator comprises again:
The flow arithmetic element, the pulse signal union that receives described pulse transducer is handled;
Temperature compensation unit receives the temperature signal of described temperature sensor and real-Time Compensation because the temperature-induced variations amount;
Display device connects the result data that described flow integrator also shows the exclusive disjunction of monitoring;
Power supply connects described flow integrator.
2, liquid turbine flowmeter according to claim 1, it is characterized in that, described temperature compensation unit comprises again: be used for directly monitoring the monitoring modular of described fluid temperature, and be used for temperature compensation module according to the temperature compensation of different liquids temperature volume factor real-time online.
3, liquid turbine flowmeter according to claim 1, it is characterized in that, described flow integrator also comprises information transmission unit, and described information transmission unit comprises pulse signal output end mouth, 4～20mA analog signal output mouth and RS-485 PORT COM again.
4, liquid turbine flowmeter according to claim 1 is characterized in that, described flow integrator is the little power consumption integrated chip of TMCS-90S-D type series.
5, liquid turbine flowmeter according to claim 1 is characterized in that, described flow integrator also comprises the multi-segment nonlinear amending unit, is used to revise the error of described turbo flow meter.
6, liquid turbine flowmeter according to claim 1 is characterized in that, the rotor of described turbine is provided with 6 helical blades, and blade tilt is 35 °, and the blade degree of overlapping is between 0.7～1.1.
7, liquid turbine flowmeter according to claim 1 is characterized in that, many tubules of described rectifier setting are stainless-steel tube, and its quantity is one of in 19,21,35 or 42.
8, liquid turbine flowmeter according to claim 1 is characterized in that, described power supply comprises built-in 3.6V lithium battery and external power supply DC12～24V transformer.
9, liquid turbine flowmeter according to claim 1; it is characterized in that; the top of described flowmeter bodies is tiltedly installed with protective cover, and described flow integrator, described power supply are fixedly installed in the described protective cover, and described display device is arranged on the described protective cover.
10, liquid turbine flowmeter according to claim 1 is characterized in that, described flowmeter bodies is a cylindrical housings, and the two-port place is provided with outer link slot respectively, and described flowmeter bodies bottom is provided with leg, and the top is provided with handle.
11, a kind of flow metering method that is applied to the described liquid turbine flowmeter of claim 1 is characterized in that, comprises step:
Step 100, the output after described rectifier rectification, the compression of described rectification body are again through described turbo flow meter monitoring of the liquid of conveying;
Step 110, the pulse transducer on the described turbo flow meter is sent to described integrating instrument microprocessor with liquid through the pulse signal that produces;
Step 120, described integrating instrument microprocessor draws an elementary flow signal with the pulse signal that receives behind amplification, A/D conversion, counting;
Step 130, described temperature sensor is sent to described integrating instrument processor with the temperature signal of gathering;
Step 140, described integrating instrument processor is changed the temperature signal that receives through amplification, A/D, choose different model of temperature compensation, and described elementary flow signal correction is obtained the two_stage flow signal;
Step 160, output and storage flow signal.
12, the flow metering method of liquid turbine flowmeter according to claim 11, it is characterized in that, also comprise step 150 after the described step 140, described two_stage flow signal is carried out the interval judgement in flow in-scope interval, choose different flow instrument coefficients and carry out the secondary correction.
13, the flow metering method of liquid turbine flowmeter according to claim 11, it is characterized in that, described model of temperature compensation comprises: the model of temperature compensation of diesel oil, jet fuel oil and gasoline, described temperature compensation are that benchmark converts with 20 ℃, and computing formula is: V
20=V
t[1-f (t-20)]
In the formula, V
20: be 20 ℃ of volumes of oil product; V
t: be oil product t ℃ volume;
F: be oil product temperature volume factor; T: be the oil transportation actual temperature.
14, the flow metering method of liquid turbine flowmeter according to claim 12 is characterized in that, described flow instrument coefficient is formulated as K=f/q
v
In the formula, K: the instrument coefficient that is called flowmeter for scale-up factor;
F: be the pulsed frequency of turbo flow meter;
q
v: be flow by flowmeter.
15, the flow metering method of liquid turbine flowmeter according to claim 11 is characterized in that, also comprises step 170, the result of demonstration/output computing or the result data of at-once monitor.
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| CN103199801A (en) * | 2013-04-03 | 2013-07-10 | 上海理工大学 | Turbine flow sensor preamplifier with nonlinearity compensation and compensation method |
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