CN112254835A - Water flow temperature measuring method based on ultrasonic water meter and ultrasonic water meter - Google Patents
Water flow temperature measuring method based on ultrasonic water meter and ultrasonic water meter Download PDFInfo
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
- G01K11/24—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of the velocity of propagation of sound
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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Abstract
The invention discloses a water flow temperature measuring method based on an ultrasonic water meter, which comprises the following steps: acquiring a theoretical propagation distance measured from an ultrasonic transmitting end to an ultrasonic receiving end; obtaining a distance error compensation coefficient, and calculating according to the theoretical propagation distance to obtain the actual propagation distance of the ultrasonic wave; acquiring the conversion time of the time measurement chip, reading the propagation time of the current ultrasonic wave received by the time measurement chip, and calculating to obtain the actual propagation time of the ultrasonic wave according to the conversion time and the read propagation time; calculating to obtain the actual propagation speed of the ultrasonic wave in the current water body passing through the water meter according to the actual propagation distance and the actual propagation time; and calculating according to a calculation formula of the relation between the ultrasonic wave propagation speed and the water body temperature to obtain the actual temperature of the water body flowing through the water meter at present. The invention can make the water flow temperature measurement more accurate and rapid.
Description
Technical Field
The invention relates to the technical field of ultrasonic water meters, in particular to a water flow temperature measuring method based on an ultrasonic water meter and the ultrasonic water meter.
Background
With the rapid development of water supply and water use industry in China, water supply companies respectively only need to acquire data such as water consumption of users, and temperature data of water flow needs to be acquired for monitoring water quality. Therefore, the water meter needs to be added with a temperature acquisition function to meet the requirements of users. The current method commonly used in the industry is to add a temperature sensor module in the water meter to measure the temperature of the flowing water through temperature conduction. The method has the following defects: 1. a temperature sensor and an installation structure are required to be added, and the product cost is increased; 2. the power consumption of the water meter is increased, and therefore the service life of the water meter under the same condition is shortened.
Disclosure of Invention
The invention provides a water flow temperature measuring method based on an ultrasonic water meter and the ultrasonic water meter, so that the water flow temperature measurement is more accurate and rapid.
In order to solve the technical problem, in one aspect, the present invention provides a water flow temperature measuring method based on an ultrasonic water meter, where the water flow temperature measuring method includes:
acquiring a theoretical propagation distance measured from an ultrasonic transmitting end to an ultrasonic receiving end;
obtaining a distance error compensation coefficient, and calculating according to the theoretical propagation distance to obtain the actual propagation distance of the ultrasonic wave;
acquiring the conversion time of the time measurement chip, reading the propagation time of the current ultrasonic wave received by the time measurement chip, and calculating to obtain the actual propagation time of the ultrasonic wave according to the conversion time and the read propagation time;
calculating to obtain the actual propagation speed of the ultrasonic wave in the current water body passing through the water meter according to the actual propagation distance and the actual propagation time;
and calculating according to a calculation formula of the relation between the ultrasonic wave propagation speed and the water body temperature to obtain the actual temperature of the water body flowing through the water meter at present.
As a preferable aspect of the above technical solution, the method for measuring a temperature of a water flow further includes: before the theoretical propagation distance measured from the ultrasonic wave transmitting end to the ultrasonic wave receiving end is obtained, the following steps are required: and measuring the distance between the ultrasonic transmitting end and the ultrasonic receiving end, and storing the measured distance as the theoretical propagation distance of the ultrasonic wave.
As a preferable aspect of the above technical solution, the method for measuring a temperature of a water flow further includes: before the theoretical propagation distance measured from the ultrasonic wave transmitting end to the ultrasonic wave receiving end is obtained, the following steps are required: acquiring a first propagation speed of ultrasonic waves in purified water at a first specific temperature and a second propagation speed of the ultrasonic waves in purified water at a second specific temperature, reading first propagation time of the ultrasonic waves in the purified water flowing through the water meter when the purified water at the first specific temperature flows through the water meter, and reading second propagation time of the ultrasonic waves in the purified water flowing through the water meter when the purified water at the second specific temperature flows through the water meter;
calculating and obtaining the actual propagation distance of the ultrasonic wave and the conversion time of the time measurement chip according to the first propagation speed and the first propagation time as well as the second propagation speed and the second propagation time, and storing the conversion time;
and obtaining a distance error compensation coefficient of the ultrasonic water meter according to the actual propagation distance and the theoretical propagation distance and storing the distance error compensation coefficient.
Preferably, in the above technical solution, the calculation formula of the propagation velocity and the temperature is: f1 ═ 1495.7 Cx + ((1495.7 Cx-2.3396e6) ^2+4.6367e9) ^ (1/2) -2.3396e6) ^ (1/3) -1667.5/(1495.7 Cx + ((1495.7 Cx-2.3396e6) ^2+4.6367e9) ^ (1/2) -2.3396e6) ^ (1/3) + 57.931; in fact, f1 is the temperature of the current water body, and Cx is the actual propagation speed of the ultrasonic wave in the current water body.
Preferably, the first propagation speed is a propagation speed of the ultrasonic wave in the 15 ℃ pure water, and the second propagation speed is a propagation speed of the ultrasonic wave in the 25 ℃ pure water.
Preferably, the first propagation time is the propagation time of the ultrasonic wave in the purified water flowing through the water meter when the purified water flowing through the water meter at 15 degrees centigrade, and the second propagation time is the propagation time of the ultrasonic wave in the purified water flowing through the water meter when the purified water flowing through the water meter at 25 degrees centigrade.
As a preferable aspect of the above technical solution, the method for measuring a temperature of a water flow further includes: and calculating the temperature of the water body flowing through the water meter for many times in unit time, averaging the temperature to obtain the final display temperature, and storing the final display temperature.
As a preferable aspect of the above technical solution, the method for measuring a temperature of a water flow further includes: and calling the stored actual temperature value and displaying the actual temperature value on a display screen of the water meter.
As a preferred aspect of the above technical solution, acquiring a first propagation time of the ultrasonic wave in the purified water flowing through the water meter when the purified water flowing through the water meter at the first specific temperature comprises: the pure water flow meter of 15 degrees centigrade, ultrasonic wave emission end send the ultrasonic wave and receive the ultrasonic wave by the ultrasonic wave receiving terminal, this transmission and receiving process convert acoustic signal into the signal of telecommunication via ultrasonic transducer, obtain the time of ultrasonic wave from emission end to receiving terminal by time digital conversion chip, read this time as first propagation time, the first propagation time of ultrasonic wave in the pure water of the water gauge of flowing through when acquireing the pure water of second specific temperature and flowing through the water gauge includes: purified water at 25 ℃ flows through the water meter, the ultrasonic transmitting end sends out ultrasonic waves and the ultrasonic receiving end receives the ultrasonic waves, the transmitting and receiving processes convert acoustic signals into electric signals through the ultrasonic transducer, the time of the ultrasonic waves from the transmitting end to the receiving end is obtained through the time-to-digital conversion chip, and the time is read as second propagation time.
In another aspect, the present invention provides an ultrasonic water meter, including a control processor, the control processor including:
the storage unit is used for storing the theoretical propagation distance, the distance error compensation coefficient and the conversion time of the time measurement chip;
the acquisition unit is used for acquiring the theoretical propagation distance, the distance error compensation coefficient and the conversion time of the time measurement chip from the storage unit;
the reading unit is used for reading the propagation time of the current ultrasonic wave received by the time measuring chip;
and the calculating unit is used for calculating the actual propagation distance of the ultrasonic wave, the actual propagation time of the ultrasonic wave, the actual propagation speed of the ultrasonic wave in the current water body passing through the water meter and the actual temperature of the current water body passing through the water meter.
The invention provides a water flow temperature measuring method based on an ultrasonic water meter, which can obtain the distance from a transmitting end to a receiving end of the ultrasonic water meter by inquiring the specification of the water meter and measuring, because the distance error compensation coefficient is adopted to eliminate the error due to the influence of factors such as installation precision, measurement error, influence of external environment (such as expansion caused by heat and contraction caused by cold) and the like and the error existing between the measured distance and the actual propagation distance of the ultrasonic wave, meanwhile, the time for converting the received sound wave signal into an electric signal and displaying or reading the electric signal through a digital signal by the time measuring chip is also considered, the propagation speed of the ultrasonic waves in the water flow obtained by calculation is more accurate, so that the obtained water flow temperature value is more accurate, and the parameters required by calculation are small, the calculation process is simple, the calculation amount is greatly reduced, the energy consumption is reduced, and further, the water flow temperature value can be quickly obtained.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic diagram of the operation of ultrasonic waves propagating in a water meter according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of the present invention;
fig. 3 is a schematic structural diagram of a control processor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, an embodiment of the present invention provides a water flow temperature measuring method based on an ultrasonic water meter, where the water flow temperature measuring method includes steps S10 to S50
Step S10: acquiring a theoretical propagation distance measured from an ultrasonic transmitting end to an ultrasonic receiving end;
step S20: obtaining a distance error compensation coefficient, and calculating according to the theoretical propagation distance to obtain the actual propagation distance of the ultrasonic wave;
step S30: acquiring the conversion time of the time measurement chip, reading the propagation time of the current ultrasonic wave received by the time measurement chip, and calculating to obtain the actual propagation time of the ultrasonic wave according to the conversion time and the read propagation time;
step S40: calculating to obtain the actual propagation speed of the ultrasonic wave in the current water body passing through the water meter according to the actual propagation distance and the actual propagation time;
step S50: and calculating according to a calculation formula of the relation between the ultrasonic wave propagation speed and the water body temperature to obtain the actual temperature of the water body flowing through the water meter at present.
The invention relates to a water flow temperature measuring method based on an ultrasonic water meter, which can obtain the distance from a transmitting end to a receiving end of the ultrasonic water meter by inquiring the specification of the water meter and measuring, because the distance error compensation coefficient is adopted to eliminate the error due to the influence of factors such as installation precision, measurement error, influence of external environment (such as expansion caused by heat and contraction caused by cold) and the like and the error existing between the measured distance and the actual propagation distance of the ultrasonic wave, meanwhile, the time for converting the received sound wave signal into an electric signal and displaying or reading the electric signal through a digital signal by the time measuring chip is also considered, the propagation speed of the ultrasonic waves in the water flow obtained by calculation is more accurate, so that the obtained water flow temperature value is more accurate, and the parameters required by calculation are small, the calculation process is simple, the calculation amount is greatly reduced, the energy consumption is reduced, and further, the water flow temperature value can be quickly obtained.
In a further implementation manner of this embodiment, the water flow temperature measuring method further includes: before the theoretical propagation distance measured from the ultrasonic wave transmitting end to the ultrasonic wave receiving end is obtained, the following steps are required: and measuring the distance between the ultrasonic transmitting end and the ultrasonic receiving end, and storing the measured distance as the theoretical propagation distance of the ultrasonic wave.
The theoretical propagation distance S1 of the ultrasonic wave in this embodiment is determined by the installation positions of the ultrasonic wave transmitting end and the ultrasonic wave receiving end, and is the distance between the ultrasonic wave transmitting end and the ultrasonic wave receiving end, and can be obtained by measurement, because of the consistency of the installation size and the process, the values of the theoretical propagation distance S1 of the ultrasonic waves of all water meters of the same model are consistent, and the error is small, and the adoption of S1 as the calculation parameter can not only realize the unification of the water meters of the same type, but also reduce the calculation error.
Referring to fig. 2, the distance from the ultrasonic wave emitting end to the ultrasonic wave receiving end includes a distance L1 from the ultrasonic wave emitting end 1 to the first reflecting surface 2, a distance L2 from the first reflecting surface 2 to the second emitting surface 3, and a distance L3 from the second reflecting surface 3 to the ultrasonic wave receiving end, and S1 is L1+ L2+ L3.
In a further implementation manner of this embodiment, the water flow temperature measuring method further includes: before the theoretical propagation distance measured from the ultrasonic wave transmitting end to the ultrasonic wave receiving end is obtained, the following steps are required: acquiring a first propagation speed of ultrasonic waves in purified water at a first specific temperature and a second propagation speed of the ultrasonic waves in purified water at a second specific temperature, reading first propagation time of the ultrasonic waves in the purified water flowing through the water meter when the purified water at the first specific temperature flows through the water meter, and reading second propagation time of the ultrasonic waves in the purified water flowing through the water meter when the purified water at the second specific temperature flows through the water meter;
calculating and obtaining the conversion time of the actual propagation distance of the ultrasonic wave and the time measurement chip according to the first propagation speed and the first propagation time as well as the second propagation speed and the second propagation time, and storing the conversion time;
and obtaining a distance error compensation coefficient of the ultrasonic water meter according to the actual propagation distance and the theoretical propagation distance and storing the distance error compensation coefficient.
In this embodiment, a first propagation speed of the ultrasonic wave in the purified water at the first specific temperature and a second propagation speed of the ultrasonic wave in the purified water at the second specific temperature are the existing ones, the first propagation speed and the second propagation speed can be obtained by querying, the first propagation time and the second propagation time can be obtained by reading a time measurement chip on the water meter, which is denoted as T, and the time measurement chip needs a conversion time Δ T in the process of receiving a signal, the speed Cx of the ultrasonic wave in the liquid is inferred based on the transit time of the ultrasonic wave in the liquid and by combining a known fixed acoustic distance, and then the temperature value of the liquid is estimated according to Cx.
The basic formula: s ═ C + V × T (T is the transit time of the ultrasound in the liquid), which is simplified to S ═ C × T since the ultrasound velocity C in the liquid is much greater than the flow velocity V (negligible).
And according to the route S-C-T. The total travel distance S1 of the ultrasonic wave in the liquid is L1+ L2+ L3, and S1 can be obtained according to the design, and the actual total travel distance Sr is S1+ Δ S by introducing the path offset Δ S due to the influence of the machining precision. Since the chip switching time also takes time Δ T, the actual transit time Tr of the ultrasonic wave is T- Δ T (T is measured by the time measurement chip), so the calculation formula of the actual distance is S ═ (T- Δ T) × C, when a water body with a first specific temperature passes through the water meter and when a water body with a second specific temperature passes through the water meter, the actual propagation distances of the ultrasonic wave are Sr1 and Sr2, respectively, and the propagation times measured by the time measurement chip are Tr1 and Tr2, since the propagation times measured on the same water meter are the same, Sr1 and Sr2 are the same, and the first propagation speed Cr1 and the second propagation speed Cr2 are known by looking up the table, the switching time Δ T in the water meter time measurement process can be obtained by substituting the above formula, and the value of the distance error compensation coefficient k can be obtained according to Sr-1 + Δ S ═ k S1.
The process of obtaining the distance error compensation coefficient k and the conversion time delta t of the time measurement chip in the embodiment is simple, the calculation is convenient, the accuracy is high, and in addition, the embodiment can finish the experiment to obtain the numerical values of the distance error compensation coefficient k and the conversion time delta t of the time measurement chip and store the numerical values only by means of the existing water meter.
In a further implementation manner of this embodiment, the calculation formula of the propagation velocity and the temperature is: f1 ═ 1495.7 Cx + ((1495.7 Cx 2.33966) ^2+4.6367e9) ^ (1/2) -2.3396e6) ^ (1/3) -1667.5/(1495.7 Cx + ((1495.7 Cx-2.3396e6) ^2+4.6367e9) ^ (1/2) -2.3396e6) ^ (1/3) + 57.931; in fact, f1 is the temperature of the current water body, and Cx is the actual propagation speed of the ultrasonic wave in the current water body.
The formula of sound velocity and temperature in pure water in this embodiment is as follows:
Cx＝1402.38677+5.03798765*T-5.80980033*10-2*T2+3.3429665*10-4*T3-1.47936902*10-6*T4+3.14893508*10-9*T5，
(since the component 1.47936902X 10-6X T4+ 3.14893508X 10-9X T5 has a negligible effect on the accuracy of the calculated values of the final temperature, the above formula can be simplified to)
Cx 1402.38677+ 5.03799T-5.80980T 2+ 3.3429665T 10-4T 3 to obtain an inverse function formula
f1＝(1495.7*Cx+((1495.7*Cx-2.3396e6)^2+4.6367e9)^(1/2)-2.3396e6)^(1/3)-1667.5/(1495.7*Cx+((1495.7*Cx-2.3396e6)^2+4.6367e9)^(1/2)-2.3396e6)^(1/3)+57.931。
The current water body temperature calculation process in the embodiment is simple, the calculation amount can be reduced, and the energy consumption of the water meter is reduced.
In a further implementation manner of this embodiment, the first propagation speed is a propagation speed of the ultrasonic wave in the 15 degrees celsius pure water, and the second propagation speed is a propagation speed of the ultrasonic wave in the 25 degrees celsius pure water.
In a further implementation manner of this embodiment, the first propagation time is the propagation time of the ultrasonic wave in the purified water flowing through the water meter when the purified water flowing through the water meter at 15 degrees celsius, and the second propagation time is the propagation time of the ultrasonic wave in the purified water flowing through the water meter when the purified water flowing through the water meter at 25 degrees celsius.
The concrete reason of selecting the pure water of 15 degrees centigrade and the pure water of 25 degrees centigrade as the experimental object in this embodiment is because, the temperature is lower and the temperature in summer is high owing to the temperature in winter in the in-process of actual water delivery, it can be more close to real operational environment to select the pure water of 15 degrees centigrade and the pure water of 25 degrees centigrade, can get rid of the error that causes owing to the temperature reason in the environment of actual work, in addition, among the process of experiment, the temperature difference of selected water body sample is bigger then its experimental data is more accurate, consequently, the temperature difference of adopting two kinds of samples in this embodiment is 10 degrees centigrade, it both can prevent the error that is brought by ambient temperature, can also guarantee the accuracy simultaneously.
In a further implementation manner of this embodiment, the water flow temperature measuring method further includes: and calculating the temperature of the water body flowing through the water meter for many times in unit time, averaging the temperature to obtain the final display temperature, and storing the final display temperature.
In this embodiment, the error in the specific measurement process can be reduced by using multiple measurements to obtain the average value.
In a further implementation manner of this embodiment, the water flow temperature measuring method further includes: and calling the stored actual temperature value and displaying the actual temperature value on a display screen of the water meter.
In a further embodiment of this embodiment, obtaining a first propagation time of the ultrasonic wave in the purified water flowing through the water meter when the purified water flowing through the water meter at the first specific temperature comprises: the pure water flow meter of 15 degrees centigrade, ultrasonic wave transmitting terminal sends the ultrasonic wave and receives the ultrasonic wave by the ultrasonic wave receiving terminal, this transmission and receiving process convert the acoustic signal into the signal of telecommunication via ultrasonic transducer, obtain the time of ultrasonic wave from transmitting terminal to receiving terminal and show the time by the time digital conversion chip, read the time that should show as first propagation time, the first propagation time of ultrasonic wave in the pure water of the pure water flow meter of obtaining the second specific temperature when the pure water flow meter includes: purified water at 25 ℃ flows through the water meter, the ultrasonic transmitting end sends out ultrasonic waves and the ultrasonic receiving end receives the ultrasonic waves, the transmitting and receiving processes convert acoustic signals into electric signals through the ultrasonic transducer, the time from the transmitting end to the receiving end of the ultrasonic waves is obtained through the time-to-digital conversion chip, the time is displayed, and the displayed time is read to serve as second propagation time.
The experiment that can directly carry out on the water gauge in this embodiment, the experimentation is simple effective, has reduced manpower and material resources cost in the experimentation.
Referring to fig. 3, the present embodiment further provides an ultrasonic water meter, where the ultrasonic water meter includes a control processor, and the control processor includes:
a storage unit 100 for storing a theoretical propagation distance, a distance error compensation coefficient, and a conversion time of the time measurement chip;
an obtaining unit 200, configured to obtain the theoretical propagation distance, the distance error compensation coefficient, and the conversion time of the time measurement chip from a storage unit;
a reading unit 300, configured to read propagation time of the current ultrasonic wave received by the time measurement chip;
and the calculating unit 400 is used for calculating the actual propagation distance of the ultrasonic wave, the actual propagation time of the ultrasonic wave, the actual propagation speed of the ultrasonic wave in the water body passing through the water meter at present and the actual temperature of the water body passing through the water meter at present.
According to the embodiment of the invention, according to the fact that the propagation speeds of ultrasonic waves in liquid are different at different temperatures, the liquid temperature is obtained by collecting the wave speed of the ultrasonic waves and loading a software calculation method, a temperature sensor is not required to be added, and the installation structure is simplified, so that the product cost is saved, and the service life of a water meter is prolonged under the same condition; in addition, compared with a temperature sensor, the liquid temperature sensor has no upper limit value of temperature measurement theoretically, and can measure liquid with a larger temperature range; in addition, the temperature conduction is not needed in the embodiment, the temperature value is directly obtained from the liquid without being influenced by parameters such as mechanical coefficients and environmental differences, the response speed is high, and the accuracy is higher.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A water flow temperature measuring method based on an ultrasonic water meter is characterized by comprising the following steps:
acquiring a theoretical propagation distance measured from an ultrasonic transmitting end to an ultrasonic receiving end;
obtaining a distance error compensation coefficient, and calculating according to the theoretical propagation distance to obtain the actual propagation distance of the ultrasonic wave;
acquiring the conversion time of the time measurement chip, reading the propagation time of the current ultrasonic wave received by the time measurement chip, and calculating to obtain the actual propagation time of the ultrasonic wave according to the conversion time and the read propagation time;
calculating to obtain the actual propagation speed of the ultrasonic wave in the current water body passing through the water meter according to the actual propagation distance and the actual propagation time;
and calculating according to a calculation formula of the relation between the ultrasonic wave propagation speed and the water body temperature to obtain the actual temperature of the water body flowing through the water meter at present.
2. The water flow temperature measuring method according to claim 1, further comprising: before the theoretical propagation distance measured from the ultrasonic wave transmitting end to the ultrasonic wave receiving end is obtained, the following steps are required: and measuring the distance between the ultrasonic transmitting end and the ultrasonic receiving end, and storing the measured distance as the theoretical propagation distance of the ultrasonic wave.
3. The water flow temperature measuring method according to claim 1, further comprising: before the theoretical propagation distance measured from the ultrasonic wave transmitting end to the ultrasonic wave receiving end is obtained, the following steps are required: acquiring a first propagation speed of ultrasonic waves in purified water at a first specific temperature and a second propagation speed of the ultrasonic waves in purified water at a second specific temperature, reading first propagation time of the ultrasonic waves in the purified water flowing through the water meter when the purified water at the first specific temperature flows through the water meter, and reading second propagation time of the ultrasonic waves in the purified water flowing through the water meter when the purified water at the second specific temperature flows through the water meter;
calculating and obtaining the conversion time of the actual propagation distance of the ultrasonic wave and the time measurement chip according to the first propagation speed and the first propagation time as well as the second propagation speed and the second propagation time, and storing the conversion time;
and obtaining a distance error compensation coefficient of the ultrasonic water meter according to the actual propagation distance and the theoretical propagation distance and storing the distance error compensation coefficient.
4. The water flow temperature measurement method according to claim 1, wherein the propagation velocity and temperature are calculated by the formula: f1 ═ 1495.7 Cx + ((1495.7 Cx-2.3396e6) ^2+4.6367e9) ^ (1/2) -2.3396e6) ^ (1/3) -1667.5/(1495.7 Cx + ((1495.7 Cx-2.3396e6) ^2+4.6367e9) ^ (1/2) -2.3396e6) ^ (1/3) + 57.931; in fact, f1 is the temperature of the current water body, and Cx is the actual propagation speed of the ultrasonic wave in the current water body.
5. The water flow temperature measurement method according to claim 3, wherein the first propagation velocity is a propagation velocity of the ultrasonic wave in pure water at 15 degrees Celsius, and the second propagation velocity is a propagation velocity of the ultrasonic wave in pure water at 25 degrees Celsius.
6. The water flow temperature measurement method according to claim 5, wherein the first propagation time is a propagation time of the ultrasonic waves in the pure water flowing through the water meter when pure water of 15 degrees centigrade flows through the water meter, and the second propagation time is a propagation time of the ultrasonic waves in the pure water flowing through the water meter when pure water of 25 degrees centigrade flows through the water meter.
7. The water flow temperature measuring method according to claim 1, further comprising: and calculating the temperature of the water body flowing through the water meter for many times in unit time, averaging the temperature to obtain the final display temperature, and storing the final display temperature.
8. The water flow temperature measuring method according to claim 5, further comprising: and calling the stored actual temperature value and displaying the actual temperature value on a display screen of the water meter.
9. The water flow temperature measuring method according to claim 1, wherein obtaining a first propagation time of the ultrasonic waves in the purified water flowing through the water meter while the purified water flowing through the water meter at the first specific temperature comprises: the pure water flow meter of 15 degrees centigrade, ultrasonic wave emission end send the ultrasonic wave and receive the ultrasonic wave by the ultrasonic wave receiving terminal, this transmission and receiving process convert acoustic signal into the signal of telecommunication via ultrasonic transducer, obtain the time of ultrasonic wave from emission end to receiving terminal by time digital conversion chip, read this time as first propagation time, the first propagation time of ultrasonic wave in the pure water of the water gauge of flowing through when acquireing the pure water of second specific temperature and flowing through the water gauge includes: purified water at 25 ℃ flows through the water meter, the ultrasonic transmitting end sends out ultrasonic waves and the ultrasonic receiving end receives the ultrasonic waves, the transmitting and receiving processes convert acoustic signals into electric signals through the ultrasonic transducer, the time of the ultrasonic waves from the transmitting end to the receiving end is obtained through the time-to-digital conversion chip, and the time is read as second propagation time.
10. An ultrasonic water meter, comprising a control processor, the control processor comprising:
the storage unit is used for storing the theoretical propagation distance, the distance error compensation coefficient and the conversion time of the time measurement chip;
the acquisition unit is used for acquiring the theoretical propagation distance, the distance error compensation coefficient and the conversion time of the time measurement chip from the storage unit;
the reading unit is used for reading the propagation time of the current ultrasonic wave received by the time measuring chip;
and the calculating unit is used for calculating the actual propagation distance of the ultrasonic wave, the actual propagation time of the ultrasonic wave, the actual propagation speed of the ultrasonic wave in the current water body passing through the water meter and the actual temperature of the current water body passing through the water meter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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