CN104729582A - Temperature detection method for ultrasonic flow detection and ultrasonic flow metering device - Google Patents
Temperature detection method for ultrasonic flow detection and ultrasonic flow metering device Download PDFInfo
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- CN104729582A CN104729582A CN201510099611.0A CN201510099611A CN104729582A CN 104729582 A CN104729582 A CN 104729582A CN 201510099611 A CN201510099611 A CN 201510099611A CN 104729582 A CN104729582 A CN 104729582A
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Abstract
The invention belongs to the technical field of design of ultrasonic flow meters, and particularly relates to a temperature detection method for ultrasonic flow detection and an ultrasonic flow metering device without a temperature sensor. The temperature detection method for ultrasonic flow detection includes the steps that by measuring the transmission time of two ultrasonic transducers in fair current and countercurrent states, data processing is carried out, then the sound velocity Cf is obtained, and the temperature value is worked out according to the fixed function relation of the sound velocity Cf and temperature. The fluid temperature is obtained through the data processing method and the corresponding flow metering device, errors can be controlled within the metering accuracy range, a temperature sensor does not need to be arranged on a metering pipe section, the ultrasonic flow metering device is obviously simplified, and metering errors caused by low heat conduction performance of a plastic pipe section are overcome.
Description
Technical field
The invention belongs to ultrasonic flowmeter design field, particularly a kind of temperature checking method for ultrasonic flow detection and ultrasonic flow rate measurement device.
Background technology
Ultrasonic flowmeter utilizes ultrasound wave time difference principle, realize the device that liquid or gas flow are measured, compared with traditional mechanical type gauging table, ultrasonic flow rate measuring table has the advantages such as low, the high accuracy of measuring of initial-flow is high, crushing is little, just because of these good characteristics, ultrasonic flow rate measuring table is widely used in the fields such as oil, chemical industry, metallurgy, electric power, plumbing.
See Fig. 1, the measuring principle of ultrasonic flowmeter is: upstream extremity transducer sends ultrasonic signal, by downstream end receive MUT after following current transmission time t1; Downstream end transducer sends ultrasonic signal, by upstream extremity receive MUT after countercurrent time t2, because the speed of ultrasound wave in co-current flow and counter-current flow is different, by comparing the difference of time t1, t2, just can converse the speed of fluid, for traditional U-shaped reflection route, concrete operation process is:
The following current transmission time:
(1)
The countercurrent time:
(2)
To subtract each other time and namely obtain:
(3)
Wherein, C
ffor the velocity of sound, be the fixed function of temperature, V
mbe rate of flow of fluid, at normal temperatures, the velocity of sound is generally within the scope of 1400 ~ 1500m/s, and current or gas flow rate are generally within 10m/s, therefore ignores V
m 2can obtain:
（4）
Obtain fluid temperature (F.T.) by temperature sensor, and then learn velocity of sound C
fjust can obtain rate of flow of fluid, then flow through the size in cross section according to fluid, just can learn flow.
In order to realize above-mentioned surveying and calculating process, the circuit board 4 in ultrasonic flowmeter needs to arrange transmission time detection module, be connected to metering pipeline section 1 on the first transducer 21 and the second transducer 22 on measure the ultrasound wave time and tide transmission time; Temperature detecting module, is connected to temperature sensor 3 and measures fluid temperature (F.T.) in real time.In order to accurately obtain fluid temperature data, need to offer placement hole set temperature sensor on metering pipeline section 1 tube wall, structure is comparatively complicated, production and installation cost uprise, more important question is that, for plastic metering pipeline section popular in the market, its temperature transmission speed is slow, not easily measures fluid temperature (F.T.) accurately.
Summary of the invention
Primary and foremost purpose of the present invention is to provide a kind of temperature checking method detected for ultrasonic flow, can realize not needing set temperature sensor can record the object of temperature.
For realizing above object, the technical solution used in the present invention is: a kind of temperature checking method detected for ultrasonic flow, and step is as follows:
A () treats fluid measured by passing in metering pipeline section;
B () launches ultrasonic signal to the second transducer 22 from the first transducer 21, record following current/countercurrent time t1/t2;
C () and then launches ultrasonic signal to the first transducer 21 from the second transducer 22, record adverse current/following current transmission time t2/t1;
(d) described following current transmission time
, the countercurrent time
, wherein, n is the hop count of ultrasound wave at gauge line intersegmental part reflection paths, and θ is every section of reflection paths and the non-obtuse angle measuring pipeline section axis; T1 and t2 is added and obtains
:, and then ignore in every denominator
obtain
, described is the mean value of t1 and t2, thus obtains the velocity of sound
;
E () is according to velocity of sound C
ftemperature value is obtained with the fixed function relation of temperature.
Compared with prior art, there is following technique effect in the present invention: does not re-use thermistor equitemperature characteristic device in the method and carry out measuring tempeature, but pass through the following current of pipeline section inner fluid, the measurement of adverse current time and then calculate fluid temperature (F.T.) numerical value, said method is adopted not need set temperature characteristic device in pipeline, and thermometric error can be made to control in measuring accuracy claimed range, on the basis meeting measuring accuracy, the structure of remarkable simplification ultrasonic flow rate measurement device, avoid the metric results error that the low heat conductivity due to plastics pipeline section causes.
Another object of the present invention is to provide a kind of ultrasonic flow rate measurement device not needing to use thermistor equitemperature characteristic device, can realize said temperature detection method.
For realizing above object, the technical solution used in the present invention for: a kind of ultrasonic flow rate measurement device that can realize thermometry described in claim 1, comprises
Metering pipeline section 1, fluid being measured flows through this metering pipeline section;
A pair transmitting-receiving integrated ultrasonic transducer 21,22, is placed on metering pipeline section 1, can realize the transmission of ultrasound wave co-current flow and counter-current flow;
Transmission time detection module, detected for the co-current flow and counter-current flow transmission time realized above-mentioned a pair ultrasonic transducer;
Data processing module, calculates fluid flow for time of obtaining transmission time detection module and temperature detecting module and temperature data;
Temperature detecting module, for obtaining fluid being measured real time temperature, it is characterized in that: described temperature detecting module is connected on a pair transducer on metering pipeline section, according to the operation program write in advance wherein, fluid temperature data is calculated to the ultrasound wave co-current flow and counter-current flow transmission time in metering pipeline section.
Compared with prior art, there is following technique effect in the present invention: in this device, does not re-use thermistor equitemperature characteristic device carry out measuring tempeature, but temperature detecting module is connected directly on the ultrasonic transducer on metering conduit, by to the following current of pipeline section inner fluid, the measurement of adverse current time and then calculate fluid temperature (F.T.) numerical value, said apparatus is adopted not need set temperature characteristic device in pipeline, on the basis meeting measuring accuracy, the structure of remarkable simplification ultrasonic flow rate measurement device, more can avoid the thermometric error that plastics pipeline section poor thermal conductivity causes.
Accompanying drawing explanation
Fig. 1 is the theory diagram of ultrasonic flow rate measurement device in prior art;
Fig. 2 is the theory diagram of ultrasonic flow rate measurement device embodiment 1 of the present invention;
Fig. 3 is the theory diagram of ultrasonic flow rate measurement device embodiment 2 of the present invention;
Fig. 4 is the function relation figure of the velocity of sound and temperature.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment 1: see Fig. 2, ultrasonic wave propagation path is traditional U-shaped reflection route, and described temperature detection step is:
A () treats fluid measured by passing in metering pipeline section;
B () launches ultrasonic signal to the second transducer 22 from the first transducer 21, record following current/countercurrent time t1/t2;
C () and then launches ultrasonic signal to the first transducer 21 from the second transducer 22, record adverse current/following current transmission time t2/t1;
(d) described following current transmission time
, the countercurrent time
, for U-shaped reflection paths, wherein, n=3, θ 1=90 °, θ 2=0 °, θ 3=90 °, its vertical transfer distance is L1=H, L3=H, and horizontal transport distance is L2, therefore in (b) step
, in (c) step
; By t
1with t
2addition obtains:
, due to C
fwith V
mthe order of magnitude gap existed, ignores V
m 2can draw
;
E () is according to velocity of sound C
fwith the fixed function relation of temperature, as shown in Figure 4, obtain temperature value, described temperature value is substituted in above-mentioned mistiming formula (4) and can obtain rate of flow of fluid.In process step (e), according to the function relation figure determination Temperature numerical of the velocity of sound and temperature, as can be seen from Figure 4, when fluid temperature (F.T.) is greater than after 70 degrees Celsius, the slope of the velocity of sound and temperature funtion relation curve changes, this can cause corresponding two temperature values of the acoustic velocity value of, accurately can not judge temperature value.Therefore, when using this method to measure fluid temperature (F.T.), need control flow check temperature within 70 degrees Celsius.
Embodiment 2: other parts are identical with embodiment 1, metering pipeline section internal reflection path is V-type reflection, and now n=2, θ 1=45 °, θ 2=45 °, the transmission range of two sections of transmission paths is L1, L2.Therefore in (b) step
, in (c) step
, in (d) step, data processing method is:
, due to C
fwith V
mthe order of magnitude gap existed, ignoring Vm can draw
, in process step (e), according to the function relation figure determination Temperature numerical of the velocity of sound and temperature.
Be described in detail using U-shaped and V-type typical transmission path as embodiment, but temperature checking method of the present invention is not limited thereto, the ultrasonic transmission path of other types only needs to carry out calculating according to the general formula determination path in summary of the invention and angle can obtain temperature data.
Do not re-use thermistor equitemperature characteristic device in the method and carry out measuring tempeature, but pass through the following current of pipeline section inner fluid, the measurement of adverse current time and then calculate fluid temperature (F.T.) numerical value, said method is adopted not need set temperature characteristic device in pipeline, and thermometric error can be made to control in measuring accuracy claimed range, on the basis meeting measuring accuracy, the structure of remarkable simplification ultrasonic flow rate measurement device, avoids the metric results error that the low heat conductivity due to plastics pipeline section causes.
In order to realize said temperature detection method, the present invention also provides a kind of ultrasonic flow rate measurement device not needing to use thermistor equitemperature characteristic device, see Fig. 2 and Fig. 3.
A ultrasonic flow rate measurement device for thermometry described in claim 1 can be realized, comprise
Metering pipeline section 1, fluid being measured flows through this metering pipeline section;
A pair transmitting-receiving integrated ultrasonic transducer 21,22, is placed on metering pipeline section 1, can realize the transmission of ultrasound wave co-current flow and counter-current flow; Transmission time detection module, detected for the co-current flow and counter-current flow transmission time realized above-mentioned a pair ultrasonic transducer; Data processing module, calculates fluid flow for time of obtaining transmission time detection module and temperature detecting module and temperature data; Temperature detecting module, for obtaining fluid being measured real time temperature, described temperature detecting module is connected on a pair transducer on metering pipeline section, calculates fluid temperature data according to the operation program write in advance wherein to the ultrasound wave co-current flow and counter-current flow transmission time in metering pipeline section.
Preferably, described transmission time detection module, data processing module, temperature detecting module are all arranged on the circuit board 4.
Described circuit board 4 is also provided with main control module, for the operation sequential of controls transfer time detecting module, data processing module, temperature detecting module.
Described main control module being also connected with data-interface, transferring to external reception end for flow information being adopted wireless or wired mode.
In this device, do not re-use thermistor equitemperature characteristic device carry out measuring tempeature, but temperature detecting module is connected directly on the ultrasonic transducer on metering conduit, by to the following current of pipeline section inner fluid, the measurement of adverse current time and then calculate fluid temperature (F.T.) numerical value, said apparatus is adopted not need set temperature characteristic device in pipeline, on the basis meeting measuring accuracy, the structure of remarkable simplification ultrasonic flow rate measurement device, avoids the metric results error that the low heat conductivity due to plastics pipeline section causes.
Claims (9)
1., for the temperature checking method that ultrasonic flow detects, it is characterized in that:
A () treats fluid measured by passing in metering pipeline section;
B () launches ultrasonic signal to the second transducer (22) from the first transducer (21), record following current/countercurrent time t1/t2;
C () and then launches ultrasonic signal to the first transducer (21) from the second transducer (22), record adverse current/following current transmission time t2/t1;
(d) described following current transmission time
, the countercurrent time
, wherein, n is the hop count of ultrasound wave at gauge line intersegmental part reflection paths, and θ is every section of reflection paths and the non-obtuse angle measuring pipeline section axis, and Cf is the velocity of sound, and Vm is rate of flow of fluid; T1 and t2 is added and obtains:
, and then ignore in every denominator
obtain
, described is the mean value of t1 and t2, thus obtains the velocity of sound
;
E () is according to velocity of sound C
ftemperature value is obtained with the fixed function relation of temperature.
2. temperature checking method according to claim 1, is characterized in that: the specific formula for calculation determining t1 and t2 according to the concrete reflection paths of metering pipeline section.
3. temperature checking method according to claim 2, is characterized in that: under U-shaped reflection paths condition, and vertical transfer distance is H, horizontal transport distance is L2, in (b) step, in (c) step, d in () step, data processing method is:, ignoring Vm can draw.
4. temperature checking method according to any one of claim 1 to 3, is characterized in that: described fluid temperature values is not higher than 70 DEG C.
5. can realize a ultrasonic flow rate measurement device for thermometry described in claim 1, comprise
Metering pipeline section 1, fluid being measured flows through this metering pipeline section;
A pair transmitting-receiving integrated ultrasonic transducer (21,22), is placed on metering pipeline section 1, can realize the transmission of ultrasound wave co-current flow and counter-current flow;
Transmission time detection module, detected for the co-current flow and counter-current flow transmission time realized above-mentioned a pair ultrasonic transducer;
Data processing module, calculates fluid flow for time of obtaining transmission time detection module and temperature detecting module and temperature data;
Temperature detecting module, for obtaining fluid being measured real time temperature, it is characterized in that: described temperature detecting module is connected on a pair transducer on metering pipeline section, according to the operation program write in advance wherein, fluid temperature data is calculated to the ultrasound wave co-current flow and counter-current flow transmission time in metering pipeline section.
6. a kind of ultrasonic flow rate measurement device according to claim 5, is characterized in that: described transmission time detection module, data processing module, temperature detecting module are all arranged on circuit board (4).
7. a kind of ultrasonic flow rate measurement device according to claim 6, is characterized in that: described circuit board is also provided with main control module, for the operation sequential of controls transfer time detecting module, data processing module, temperature detecting module.
8. a kind of ultrasonic flow rate measurement device according to claim 7, is characterized in that: described main control module is also connected with data-interface, transfers to external reception end for flow information being adopted wireless or wired mode.
9. a kind of ultrasonic flow rate measurement device according to any one of claim 5 to 8, is characterized in that: fluid being measured temperature is not higher than 70 DEG C.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105823518A (en) * | 2016-05-19 | 2016-08-03 | 威海市天罡仪表股份有限公司 | Temperature-sensor-free ultrasonic flow meter |
| CN107847076A (en) * | 2015-07-01 | 2018-03-27 | 皇家戴维艾格伯茨有限公司 | Prepare the method for beverage and prepare the device of beverage |
| CN108414039A (en) * | 2018-05-18 | 2018-08-17 | 广东万家乐燃气具有限公司 | A kind of water flow, water temperature detection method and water flow sensor |
| CN110470254A (en) * | 2019-09-26 | 2019-11-19 | 西安热工研究院有限公司 | A kind of pipeline creep measurement system and method |
| CN111982343A (en) * | 2020-08-19 | 2020-11-24 | 闽南师范大学 | Water temperature acoustic chromatography method and device suitable for river sea area |
| CN114199996A (en) * | 2020-09-17 | 2022-03-18 | 深圳市慧传科技有限公司 | Plateau oxygen concentration testing method and device based on ultrasonic principle |
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| CN114199996A (en) * | 2020-09-17 | 2022-03-18 | 深圳市慧传科技有限公司 | Plateau oxygen concentration testing method and device based on ultrasonic principle |
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Application publication date: 20150624 |