CN112729593B - Ultrasonic flowmeter large-range temperature measuring equipment and method for water pipe - Google Patents
Ultrasonic flowmeter large-range temperature measuring equipment and method for water pipe Download PDFInfo
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- CN112729593B CN112729593B CN202011525114.XA CN202011525114A CN112729593B CN 112729593 B CN112729593 B CN 112729593B CN 202011525114 A CN202011525114 A CN 202011525114A CN 112729593 B CN112729593 B CN 112729593B
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01F1/662—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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Abstract
The invention discloses a large-range temperature measuring device and method for an ultrasonic flowmeter of a water pipe, wherein the device comprises thermistors, a visual temperature meter and N groups of ultrasonic devices, wherein the thermistors are uniformly distributed on the side wall of the pipe; the visual temperature instruments are connected with the thermistors in a one-to-one correspondence manner and are arranged on the outer wall of the pipeline; each group of ultrasonic devices comprises an ultrasonic transmitting device and an ultrasonic receiving device; the N groups of ultrasonic devices are uniformly distributed on the inner wall of the pipeline; n is an integer of 2 or more. The large-range temperature measuring equipment and method for the ultrasonic flowmeter for the water pipe can accurately represent the temperature of liquid and improve the temperature measuring and calculating precision.
Description
Technical Field
The invention belongs to the technical field of water pipe temperature measurement, and particularly relates to large-range temperature measurement equipment and method for an ultrasonic flowmeter for a water pipe.
Background
In the water meter and water pipe field, it is often necessary to monitor the temperature of the water in the pipe. Temperature acquisition is usually performed by placing a temperature sensor in the pipeline.
However, such a design still has some defects, such as that only the temperature sensor is used for temperature acquisition, and the measurement accuracy of the temperature is not sufficient; on the other hand, the temperature sensor is expensive to lay and cannot be popularized. Therefore, there is a strong need for a wide-range temperature measuring device and method of an ultrasonic flowmeter with more accurate temperature measurement.
Disclosure of Invention
The invention aims at the defects and provides the large-range temperature measuring equipment and the method for the ultrasonic flowmeter of the water pipe, which can accurately represent the temperature of the liquid and improve the temperature measuring and calculating precision.
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
on one hand, the embodiment of the invention provides large-range temperature measuring equipment of an ultrasonic flowmeter for a water pipe, which comprises thermistors, a visual temperature meter and N groups of ultrasonic devices, wherein the thermistors are uniformly distributed on the side wall of the pipeline; the visual temperature instruments are connected with the thermistors in a one-to-one correspondence manner and are arranged on the outer wall of the pipeline; each group of ultrasonic devices comprises an ultrasonic transmitting device and an ultrasonic receiving device; the N groups of ultrasonic devices are uniformly distributed on the inner wall of the pipeline; n is an integer of 2 or more.
Preferably, the measuring equipment further comprises a metal sheet, a battery anode and a battery cathode are installed in the pipeline, and the battery anode and the battery cathode are respectively connected with an external device; tracks are distributed on the upper part and the lower part of the inner wall of the pipeline, and the metal sheets are embedded on the tracks; when the device works, the metal sheet slides along the track under the impact of water flow and is connected or disconnected with the anode and the cathode of the battery.
Preferably, the measuring device further comprises an impeller connected to the foil by a bracket; when the device works, the impeller rotates along with water flow and pushes the metal sheet to slide along the track.
Preferably, the measuring equipment further comprises a blocking plate, an external device, a signal emitter and a baffle plate, wherein one end of the blocking plate and one end of the baffle plate are fixedly connected with the metal sheet respectively; the other end of the baffle is positioned between the blades of the impeller; the baffle is connected with a power supply, the blocking plate is connected with a signal transmitter, and the baffle and the blocking plate are obliquely arranged in parallel; when the water flow sensor works, if water flow reversely flows, the impeller pushes the baffle plate to be in contact communication with the blocking plate to supply power to the signal transmitter, and the signal transmitter transmits signals to the external connecting device.
Preferably, the metal sheets are arranged in the water pipe at equal intervals.
Preferably, the external device comprises a processor, and the processor is connected with the impeller, the visual temperature instrument, the N groups of ultrasonic devices and the signal transmitter; the processor is used for acquiring data and performing real-time analysis.
Preferably, the metal sheet has a width of 0.5 to 3mm and a thickness of 0.5 to 1mm, and is made of a stainless material.
On the other hand, the embodiment of the invention also provides a temperature measuring method using the wide-range temperature measuring equipment for the ultrasonic flowmeter for the water pipe, and the measuring method specifically comprises the following steps:
step 10) measuring the resistance value of the thermistor, calculating the temperature of the thermistor according to the resistance value and the temperature relation of the thermistor, and displaying the temperature on a visual temperature instrument; calculating an arithmetic mean value of the temperatures of all the thermistors to serve as a first temperature value of the water flow;
step 20) calculating the speed of the ultrasonic waves in the water flow according to the ultrasonic wave transmission time between the ultrasonic wave receiving device and the ultrasonic wave transmitting device; calculating the water flow temperature measured by the ultrasonic device according to the speed of the ultrasonic waves in the water flow; calculating an arithmetic mean value of the water flow temperatures measured by all the ultrasonic devices to serve as a second temperature value of the water flow;
step 30) if the absolute value of the difference value between the first temperature value and the second temperature value is smaller than a threshold value, taking the first temperature value as the actual temperature value of the water flow; and if the absolute value of the difference value between the first temperature value and the second temperature value is greater than or equal to the threshold value, the pipeline is overhauled.
Preferably, the relationship between the resistance value of the thermistor and the temperature specifically includes:
if the thermistor is a metal thermal resistor, the relationship between the resistance value and the temperature is shown as the formula (1):
Rt＝Rt0[1+α(t-t0)]formula (1)
Wherein R istRepresents the resistance value at temperature t; rt0Represents the temperature t0The time corresponds to the resistance value; α represents a temperature coefficient;
if the thermistor is a semiconductor thermistor made of semiconductor materials, the relation between the resistance value and the temperature is shown as the formula (2):
RtAeB/t type (2)
Wherein R istDenotes a resistance value at a temperature t, a denotes a first structural constant of the semiconductor material, B denotes a second structural constant of the semiconductor material, and e denotes a constant.
Preferably, the calculating the second temperature value of the water flow according to the speed of the ultrasonic wave in the water flow includes calculating the second temperature value of the water flow according to equation (3):
Ct＝331.6+0.6t1formula (3)
Wherein, CtRepresenting a second temperature value t1The speed of sound propagation.
Compared with the prior art, the large-range temperature measuring device and method for the ultrasonic flowmeter for the water pipe can accurately represent the temperature of liquid and improve the temperature measuring and calculating precision. The large-range temperature measuring equipment for the ultrasonic flowmeter for the water pipe comprises thermistors, a visual temperature instrument and N groups of ultrasonic devices, wherein the thermistors are uniformly distributed on the side wall of the pipe; the visual temperature instruments are connected with the thermistors in a one-to-one correspondence manner and are arranged on the outer wall of the pipeline; each group of ultrasonic devices comprises an ultrasonic transmitting device and an ultrasonic receiving device; the N groups of ultrasonic devices are uniformly distributed on the inner wall of the pipeline; n is an integer of 2 or more. The temperature of the water flow is measured by using a plurality of thermistors simultaneously, and the arithmetic mean value of the temperatures of all the thermistors is calculated, so that the temperature measurement precision of single equipment is improved; simultaneously, the temperature of rivers that combines a plurality of ultrasonic wave devices to record is as the reference value, further improves the temperature measurement precision, uses the temperature of record to carry out the heat and calculates to realize that the heating output or the heating output are got to the meticulous meter.
Drawings
FIG. 1 is a schematic diagram of a portion of an embodiment of the present invention;
fig. 2 is a schematic structural view of an impeller in the embodiment of the present invention.
The figure shows that: the ultrasonic temperature measuring device comprises a thermistor 1, a visual temperature instrument 2, an ultrasonic receiving device 3, an ultrasonic transmitting device 4, a metal sheet 5, an impeller 6, a baffle 7, a baffle plate 8, a positive electrode 9 and a negative electrode 10.
Detailed Description
The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.
As shown in fig. 1, the wide-range temperature measuring device of the ultrasonic flowmeter for the water pipe in the embodiment of the invention comprises a thermistor 1, a visual temperature instrument 2 and N groups of ultrasonic devices, wherein the thermistor 1 is uniformly arranged on the side wall of the pipe; the visual temperature instruments 2 are correspondingly connected with the thermistors 1 one by one and are arranged on the outer wall of the pipeline; each group of the ultrasonic devices comprises an ultrasonic transmitting device 4 and an ultrasonic receiving device 3; the N groups of ultrasonic devices are uniformly distributed on the inner wall of the pipeline; n is an integer of 2 or more.
The thermistor 1 indirectly represents the temperature of water flow by utilizing the difference of resistance values at different temperatures, the thermistor 1 can indirectly represent the water temperature according to the property that the water temperature cannot be suddenly changed after a certain time, and the thermistor 1 can accurately reflect the change of the water temperature and the final water temperature within a certain time due to the fact that the water temperature rises in a certain process. Meanwhile, N groups of ultrasonic devices are arranged to be used as assistance, the water flow temperature is measured simultaneously, and the ultrasonic devices perform temperature characterization by utilizing the difference of the propagation speeds of sound in liquid with different temperatures or gas with different temperatures. The ultrasonic device is used, the influence caused by liquid can be weakened, the temperature range which can be measured by the ultrasonic device is large, and the general water temperature range can be completely covered by 0-100 ℃.
It should be noted that, in the embodiment of the present invention, the visual temperature meter 2 is selected to monitor and detect the thermistor 1, and according to the change of the thermal resistance, the change is indirectly performed in combination with the temperatures corresponding to different resistance values of the thermistor 1, and the resistance value of the thermistor 1 at a certain temperature is expressed by the temperature corresponding to the resistance value. Generally, the thermistor 1 has a resistance value that is difficult to determine if the temperature is high or low without looking up a table or looking at the parameters of the meter. On the contrary, the resistance value is directly converted into the temperature to be displayed, all professional and non-professional personnel can judge the temperature visually, and the working efficiency is improved.
In the wide-range temperature measuring device of the ultrasonic flowmeter for the water pipe of the embodiment, preferably, the wide-range temperature measuring device further comprises a metal sheet 5, a battery anode 9 and a battery cathode 10 are installed in the pipeline, and the battery anode 9 and the battery cathode 10 are respectively connected with an external device; tracks are distributed on the upper part and the lower part of the inner wall of the pipeline, and the metal sheets 5 are embedded on the tracks; when the water-cooled lithium ion battery works, the metal sheet 5 slides along the track under the impact of water flow and is connected or disconnected with the positive electrode 9 and the negative electrode 10 of the battery. By arranging the battery anode 9, the battery cathode 10 and the metal sheet 5, when the metal sheet 5 is impacted by water flow and slides in the positive direction on the track, the battery anode 9 and the battery cathode 10 are switched on, and the outward connecting device generates current, which indicates that the water flow direction is the positive direction; when water flow generates reverse flow, the metal sheet 5 is not communicated with the anode and the cathode of the battery, so that no current is generated, the external device judges that the water flow direction is reverse at the moment, and the pipeline is overhauled.
Preferably, the metal sheet 5 further comprises an impeller 6, and the impeller 6 is connected to the metal sheet 5 through a bracket; in operation, the impeller 6 rotates with the water flow and pushes the foil 5 to slide along the rail. The impeller 6 is arranged on the metal sheet 5, so that when the impeller 6 rotates in water flow, power along the water flow direction is generated to push the metal sheet 5; meanwhile, the external device can measure the flow velocity of water flow at the moment according to the rotating speed of the impeller 6.
Preferably, the ultrasonic flowmeter large-range temperature measuring equipment for the water pipe further comprises a blocking plate 8, an external device, a signal emitter and a baffle 7, wherein one end of the blocking plate 8 and one end of the baffle 7 are fixedly connected with the metal sheet 5 respectively; the other end of the baffle 7 is positioned between the blades of the impeller 6; the baffle 7 is connected with a power supply, the blocking plate 8 is connected with a signal transmitter, and the baffle 7 and the blocking plate 8 are obliquely arranged in parallel; when the water flow reversing device works, if the water flow reversely flows, the impeller 6 pushes the baffle 7 to be in contact communication with the blocking plate 8, power is supplied to the signal transmitter, and the signal transmitter transmits signals to the external connecting device. The baffle plate 8 and the baffle plate 7 are in a non-contact state when placed, when water flows in the forward direction, the impeller 6 rotates in the forward direction and touches the baffle plate 7, but normal work is not influenced; when rivers reverse flow, 6 antiport of impeller drives baffle 7 and baffler 8 intercommunication, and baffle 7 is located between 6 blades of impeller simultaneously, makes 6 blocks of impeller, can't continue to rotate, and baffle 7 and baffler 8 intercommunication back are for the power supply of signal transmitter, and signal transmitter sends the signal to external device, show that 6 locks of impeller, and rivers are reverse, need overhaul.
Preferably, the metal sheets 5 are arranged equidistantly in the water pipe. Through laying foil 5 equidistance in the water pipe, can cross cutting apart into a plurality of parts with the water pipe, when the water pipe takes place to burst the circumstances such as, the rivers flow to opposite in the department of bursting upper reaches and low reaches, can show the rivers reverse flow condition through foil 5 immediately to find the department of bursting, in time overhaul the water pipe.
Preferably, the external device comprises a processor, and the processor is connected with the impeller 6, the visual temperature instrument 2, the N groups of ultrasonic devices and the battery; the processor is used for acquiring data and performing real-time analysis. Through setting up the treater, calculate and handle rivers temperature, the velocity of water data of gathering, carry out instant feedback to the signal of gathering, according to treater feedback result, overhaul the pipeline.
Preferably, the metal sheet 5 has a width of 0.5 to 3mm and a thickness of 0.5 to 1mm, and is made of a stainless material. By limiting the thickness and the width of the metal sheet 5, the metal sheet 5 is ensured not to be immobilized, broken or deflected in water.
On the other hand, an embodiment of the present invention further provides a temperature measurement method using the wide-range temperature measurement device of the ultrasonic flow meter in claim 1, where the temperature measurement method specifically includes the following steps:
step 10) measuring the resistance value of the thermistor 1, calculating the temperature of the thermistor 1 according to the resistance value and the temperature relational expression of the thermistor 1, and displaying the temperature on the visual temperature instrument 2; calculating an arithmetic mean value of the temperatures of all the thermistors 1 to be used as a first temperature value of the water flow;
step 20) calculating the speed of the ultrasonic waves in the water flow according to the ultrasonic wave transmission time between the ultrasonic wave receiving device 3 and the ultrasonic wave transmitting device 4; calculating the water flow temperature measured by the ultrasonic device according to the speed of the ultrasonic waves in the water flow; calculating an arithmetic mean value of the water flow temperatures measured by all the ultrasonic devices to serve as a second temperature value of the water flow;
step 30) if the absolute value of the difference value between the first temperature value and the second temperature value is smaller than a threshold value, taking the first temperature value as the actual temperature value of the water flow; and if the absolute value of the difference value between the first temperature value and the second temperature value is greater than or equal to the threshold value, the pipeline is overhauled.
By arranging the thermistor 1, the temperature of the water flow is calculated by utilizing the difference of resistance values at different temperatures. After a certain time, the thermistor 1 can indirectly represent the water temperature according to the property that the water temperature cannot be suddenly changed. Since there is a process of increasing the water temperature, the thermistor 1 can accurately reflect the change of the water temperature and the final water temperature within a certain time. Meanwhile, N groups of ultrasonic devices are arranged as assistance, and the water flow temperature is measured and calculated at the same time. The ultrasonic device utilizes the difference of the propagation speed of sound in liquid with different temperatures or gas with different temperatures to characterize the temperature. The ultrasonic device is used, the influence caused by liquid can be weakened, the temperature range which can be measured by the ultrasonic device is large, and the general water temperature range can be completely covered by 0-100 ℃. The first temperature value and the second temperature value are calculated simultaneously, the difference value of the first temperature value and the second temperature value is calculated, the difference value is compared with the threshold value, the precision of temperature measurement is guaranteed, the pipeline abnormity can be displayed in time, the pipeline is overhauled in time, and loss is reduced as far as possible.
Preferably, the relationship between the resistance value and the temperature of the thermistor 1 specifically includes:
if the thermistor 1 is a metal thermal resistor, the relationship between the resistance and the temperature is shown as the following formula (1):
Rt＝Rt0[1+α(t-t0)]formula (1)
Wherein R istRepresents the resistance at temperature tA value; rt0Represents the temperature t0The time corresponds to the resistance value; α represents a temperature coefficient;
if the thermistor 1 is a semiconductor thermistor made of a semiconductor material, the relationship between the resistance value and the temperature is as shown in formula (2):
RtAeB/t type (2)
Wherein R istDenotes a resistance value at a temperature t, a denotes a first structural constant of the semiconductor material, B denotes a second structural constant of the semiconductor material, and e denotes a constant. Preferably, e is 2.718282.
In comparison, the thermistor 1 has a larger temperature coefficient, a higher resistance value at normal temperature, which can usually reach over thousands of ohms, but has poor interchangeability and serious nonlinearity, and the temperature measurement range is only about-50 to 300 ℃, so that the thermistor is widely used for detecting and controlling the temperature of household appliances and automobiles. The metal thermal resistor is generally suitable for temperature measurement within the range of-200 to 500 ℃, and has the characteristics of accurate measurement, good stability, reliable performance and extremely wide application in control.
Preferably, the calculating the second temperature value of the water flow according to the speed of the ultrasonic wave in the water flow includes calculating the second temperature value of the water flow according to equation (3):
Ct＝331.6+0.6t1formula (3)
Wherein, CtRepresenting a second temperature value t1The speed of sound propagation.
The specific working process of the embodiment is as follows: after the installation is finished, the instant temperature of the water flow measured by the single thermistor 1 can be seen by observing the visual temperature instrument 2, then the measured first temperature value and the second temperature value can be obtained by the processor, the accuracy of the first temperature value is ensured by taking the second temperature value as a reference, and if the difference value of the first temperature value and the second temperature value is greater than a threshold value, the pipeline is overhauled; meanwhile, the flowing condition of water flow is detected through the metal sheet 5, when the water flow normally flows, the processor can receive current caused by connection of the anode and the cathode of the battery, if the water flow generates reverse flow, the baffle 7 is connected with the blocking plate 8, the processor can receive a reverse flow signal transmitted by the signal transmitter, and at the moment, the pipeline is overhauled; the impeller 6 on the metal sheet 5 rotates along with the flow of the water flow, on one hand, the flow speed of the water flow at the moment is obtained according to the rotation speed, and on the other hand, the power generated by the rotation of the impeller 6 pushes the metal sheet 5 to slide; and finally, calculating the integral heating quantity of the pipeline at the moment by the processor according to the obtained water flow speed and water flow temperature and by combining the size of the pipeline.
Compared with the prior art, the large-range temperature measuring equipment and method for the ultrasonic flowmeter for the water pipe have the advantages that the temperature of water flow is measured by simultaneously using the plurality of thermistors, and the arithmetic mean value of the temperatures of all the thermistors is calculated, so that the temperature measuring precision of single equipment is improved; meanwhile, the temperature of the water flow measured by the ultrasonic devices is used as a reference value, so that the temperature measurement precision is further improved. And the measured temperature is used for heat calculation, so that the heating amount or the heating amount can be measured finely.
The embodiments of the present invention are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the content of the claims of the present invention should be regarded as the technical scope of the present invention.
Claims (7)
1. The large-range temperature measuring equipment for the ultrasonic flowmeter is characterized by comprising thermistors (1), a visual temperature instrument (2) and N groups of ultrasonic devices, wherein the thermistors (1) are uniformly distributed on the side wall of a pipeline; the visual temperature instruments (2) are correspondingly connected with the thermistors (1) one by one and are arranged on the outer wall of the pipeline; each group of ultrasonic devices comprises an ultrasonic transmitting device (4) and an ultrasonic receiving device (3); the N groups of ultrasonic devices are uniformly distributed on the inner wall of the pipeline; n is an integer greater than or equal to 2;
the device is characterized by also comprising a metal sheet (5), wherein a battery anode (9) and a battery cathode (10) are arranged in the pipeline, and the battery anode (9) and the battery cathode (10) are respectively connected with an external device; tracks are distributed on the upper part and the lower part of the inner wall of the pipeline, and the metal sheets (5) are embedded on the tracks; when the device works, the metal sheet (5) is impacted by water flow to slide along a track and is connected or disconnected with a positive electrode (9) and a negative electrode (10) of the battery;
the device also comprises an impeller (6), wherein the impeller (6) is connected to the metal sheet (5) through a support; when the device works, the impeller (6) rotates along with water flow and pushes the metal sheet (5) to slide along the track;
the device is characterized by also comprising a blocking plate (8), an external device, a signal emitter and a baffle (7), wherein one end of the blocking plate (8) and one end of the baffle (7) are respectively and fixedly connected with the metal sheet (5); the other end of the baffle (7) is positioned between the blades of the impeller (6); the baffle (7) is connected with a power supply, the blocking plate (8) is connected with a signal transmitter, and the baffle (7) and the blocking plate (8) are obliquely arranged in parallel; when the water flow reversing device works, if water flow reversely flows, the impeller (6) pushes the baffle (7) to be in contact communication with the blocking plate (8) to supply power for the signal transmitter, and the signal transmitter transmits signals to the external connecting device.
2. The ultrasonic flow meter wide range temperature measurement device for water pipes as claimed in claim 1, wherein the metal sheets (5) are arranged equidistantly in the water pipe.
3. The ultrasonic flow meter extended temperature measurement device for water pipes of claim 1 wherein the external means comprises a processor connected to the impeller (6), the visual temperature meter (2), the N sets of ultrasonic means and the signal transmitter; the processor is used for acquiring data and performing real-time analysis.
4. The ultrasonic flow meter wide range temperature measurement device for water pipes of claim 1 wherein the metal foils (5) are made of stainless steel material.
5. A temperature measuring method using the wide range temperature measuring apparatus of the ultrasonic flow meter for water pipes according to claim 1, wherein the measuring method specifically comprises the steps of:
step 10), measuring the resistance value of the thermistor (1), calculating the temperature of the thermistor (1) according to the resistance value and the temperature relational expression of the thermistor (1), and displaying the temperature on the visual temperature instrument (2); calculating an arithmetic mean value of the temperatures of all the thermistors (1) as a first temperature value of the water flow;
step 20) calculating the speed of the ultrasonic waves in the water flow according to the ultrasonic wave transmission time between the ultrasonic wave receiving device (3) and the ultrasonic wave transmitting device (4); calculating the water flow temperature measured by the ultrasonic device according to the speed of the ultrasonic waves in the water flow; calculating an arithmetic mean value of the water flow temperatures measured by all the ultrasonic devices to serve as a second temperature value of the water flow;
step 30) if the absolute value of the difference value between the first temperature value and the second temperature value is smaller than a threshold value, taking the first temperature value as the actual temperature value of the water flow; and if the absolute value of the difference value between the first temperature value and the second temperature value is greater than or equal to the threshold value, the pipeline is overhauled.
6. The temperature measurement method according to claim 5, characterized in that the relation between the resistance value of the thermistor (1) and the temperature specifically comprises:
if the thermistor (1) is a metal thermal resistor, the relation between the resistance value and the temperature is shown as the formula (1):
Rt＝Rt0[1+α(t-t0)]formula (1)
Wherein R istRepresents the resistance value at temperature t; rt0Represents the temperature t0The time corresponds to the resistance value; α represents a temperature coefficient;
if the thermistor (1) is a semiconductor thermistor made of a semiconductor material, the relation between the resistance value and the temperature is shown as the formula (2):
RtAeB/t type (2)
Wherein R istDenotes a resistance value at a temperature t, a denotes a first structural constant of the semiconductor material, B denotes a second structural constant of the semiconductor material, and e denotes a constant.
7. The method of claim 5, wherein calculating the second temperature value for the water flow based on the velocity of the ultrasonic waves in the water flow comprises calculating the second temperature value for the water flow based on equation (3):
Ct＝331.6+0.6t1formula (3)
Wherein, CtRepresenting a second temperature value t1The speed of sound propagation.
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|---|---|---|---|---|
| CN109519707A (en) * | 2018-10-31 | 2019-03-26 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of machinery by pressure type pipeline gas is flowed to instruction device |
| CN210319424U (en) * | 2019-08-19 | 2020-04-14 | 广州锐骏盈环境检测有限公司 | Pipeline flow direction judging device |
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Denomination of invention: A wide-range temperature measurement device and method for an ultrasonic flowmeter for a water pipe Effective date of registration: 20220822 Granted publication date: 20211001 Pledgee: Bank of Nanjing Co.,Ltd. Lianyungang Branch Pledgor: LIANYUNGANG PRANCE ELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2022320000476 |
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