CN210135981U - Flow and wind speed sensor calibration device - Google Patents
Flow and wind speed sensor calibration device Download PDFInfo
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- CN210135981U CN210135981U CN201921375049.XU CN201921375049U CN210135981U CN 210135981 U CN210135981 U CN 210135981U CN 201921375049 U CN201921375049 U CN 201921375049U CN 210135981 U CN210135981 U CN 210135981U
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Abstract
The utility model discloses a flow and wind speed sensor calibration device, which comprises a pipe fitting, a fan and a steady flow filter screen which are arranged on the pipe fitting, a power supply, a frequency converter, a pitot tube, a micro-manometer, an atmospheric pressure detection device, a temperature detection device and an air humidity detection device; the side wall of the pipe fitting is provided with a pitot tube jack and a sensor jack which are positioned at the air outlet side of the steady flow filter screen, and the fan is positioned in front of the steady flow filter screen or behind the pitot tube jack and the sensor jack after the air in the pipe fitting flows; the fan is connected to the power supply and the frequency converter; the two tube angles of the pitot tube are communicated with the two interfaces of the micro-manometer. Utility model's advantage lies in: the calibration cost is low, the calibration time is short, and the condition that the spare quantity of the sensor is insufficient is avoided.
Description
Technical Field
The utility model relates to a sensor marks school field, concretely relates to flow and wind speed sensor mark school device.
Background
The mining wind speed sensor and the pipeline flow sensor are important sensors used in a coal mine monitoring system, calibration work needs to be carried out on the ground before the sensors are put into underground use, and measurement errors of the sensors are required to meet underground field measurement requirements after calibration. The conventional calibration device belongs to a precision device, has certain limitation on various aspects of use environment, has calibration precision far higher than the requirement of field use, has high price, and is mainly used for scientific research and instrument inspection qualification units. Once the sensor used on site is out of order, the sensor can only be returned to the factory for re-calibration, the whole process is long, and the spare amount of the sensor is short.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the calibration cost of the wind speed sensor and the flow sensor in the prior art is high, and the calibration time is long.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a flow and wind speed sensor calibration device comprises a pipe fitting, a fan and a steady flow filter screen which are arranged on the pipe fitting, a power supply, a frequency converter, a pitot tube, a micro-pressure meter, an atmospheric pressure detection device, a temperature detection device and an air humidity detection device;
the side wall of the pipe fitting is also provided with a pitot tube jack for mounting a pitot tube and a sensor jack for mounting a sensor to be detected, the pitot tube jack and the sensor jack are both positioned at the air outlet side of the steady flow filter screen, and the fan is positioned in front of the steady flow filter screen or behind the pitot tube jack and the sensor jack after the air in the pipe fitting flows;
the fan is connected to the power supply and the frequency converter;
the two tube angles of the pitot tube are communicated with the two interfaces of the micro-manometer.
The utility model provides a flow and wind velocity transducer mark school device is when actual application, at first with atmospheric pressure detection device, temperature-detecting device, atmospheric pressure in the atmospheric pressure detection device detects mark school environment respectively, the temperature, air humidity, then calculate the air density, then measure the dynamic pressure under the different converter numerical values with the pitot tube, mark wind speed and the flow of school department when calculating different converter numerical values, and regard the calculated value as the standard value, flow and wind velocity transducer mark school afterwards, for prior art, when adopting this device to carry out flow and wind velocity transducer mark school, need not to purchase expensive mark school equipment, also need not spend too many mark school expense, therefore the cost is lower, simultaneously because need not to send to mark school producer and mark the school, consequently mark the school time spent shorter, avoid the nervous condition of sensor spare quantity.
Preferably, the two ends of the pipe fitting are both flared ports, and the fan is installed at the end part of the pipe fitting.
Optimally, the pitot tube jack and the sensor jack are both positioned between the fan and the flow stabilizing filter screen. The pitot tube jack and the sensor jack are arranged between the fan and the flow stabilizing filter screen, during actual calibration, the fan draws air outside the pipe fitting, and the air passes through the flow stabilizing filter screen and then passes through the pitot tube jack and the sensor jack and is finally drawn out by the fan.
Preferably, the steady flow filter screen is a gauze or a wire mesh. The gauze or the wire netting has simple structure, better steady flow effect, lower cost and easy acquisition.
Preferably, the power supply adopts a voltage-stabilized power supply. The constant voltage power supply can provide stable power for the fan, and then ensures that the fan operation is stable, guarantees to mark the school accuracy.
Preferably, the micro-pressure meter adopts a compensation type micro-pressure meter. The compensation type micro-manometer is connected with the pitot tube, so that the dynamic pressure of the pipe fitting can be conveniently and accurately detected, the wind speed and the flow in the pipe fitting can be conveniently calculated, and the calibration of the sensor is prepared.
Preferably, the atmospheric pressure detection device adopts an empty box barometer. The empty box barometer has simple structure and convenient operation, and the detection process is relatively accurate.
Preferably, the air humidity detection device adopts a hygrometer. The hygrometer can conveniently detect air humidity, easy operation, and the testing result is comparatively accurate.
The beneficial effects of the utility model reside in that:
1. the utility model provides a flow and wind velocity transducer mark school device is when actual application, at first with atmospheric pressure detection device, temperature-detecting device, atmospheric pressure in the atmospheric pressure detection device detects mark school environment respectively, the temperature, air humidity, then calculate the air density, then measure the dynamic pressure under the different converter numerical values with the pitot tube, mark wind speed and the flow of school department when calculating different converter numerical values, and regard the calculated value as the standard value, flow and wind velocity transducer mark school afterwards, for prior art, when adopting this device to carry out flow and wind velocity transducer mark school, need not to purchase expensive mark school equipment, also need not spend too many mark school expense, therefore the cost is lower, simultaneously because need not to send to mark school producer and mark the school, consequently mark the school time spent shorter, avoid the nervous condition of sensor spare quantity.
2. The pitot tube jack and the sensor jack are arranged between the fan and the flow stabilizing filter screen, during actual calibration, the fan draws air outside the pipe fitting, and the air passes through the flow stabilizing filter screen and then passes through the pitot tube jack and the sensor jack and is finally drawn out by the fan.
3. The gauze or the wire netting has simple structure, better steady flow effect, lower cost and easy acquisition.
4. The constant voltage power supply can provide stable power for the fan, and then ensures that the fan operation is stable, guarantees to mark the school accuracy.
5. The compensation type micro-manometer is connected with the pitot tube, so that the dynamic pressure of the pipe fitting can be conveniently and accurately detected, the wind speed and the flow in the pipe fitting can be conveniently calculated, and the calibration of the sensor is prepared.
6. The empty box barometer has simple structure and convenient operation, and the detection process is relatively accurate.
7. The hygrometer can conveniently detect air humidity, easy operation, and the testing result is comparatively accurate.
Drawings
Fig. 1 is a schematic view of a calibration device for a flow and wind speed sensor according to an embodiment of the present invention;
wherein the content of the first and second substances,
the pipe fitting-1, the pitot tube jack-11 and the sensor jack-12;
a fan-2;
a flow stabilizing filter screen-3;
a power supply-4;
a frequency converter-5.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1, a calibration device for a flow and wind speed sensor comprises a pipe fitting 1, a fan 2, a steady flow filter screen 3, a power supply 4, a frequency converter 5, a pitot tube, a micro-pressure meter, an atmospheric pressure detection device, a temperature detection device and an air humidity detection device (not shown in the figure).
The pipe fitting 1 is the pipe, and pipe fitting 1 adopts the standard pipe fitting that the internal diameter is 250mm in this embodiment, and its both ends are the horn mouth, fan 2 installs at 1 right-hand member portion of pipe fitting, and stationary flow filter screen 3 installs inside 1 left end of pipe fitting, and stationary flow filter screen 3 perpendicular to pipe fitting 1's axis.
Still offer the pitot tube jack 11 that is used for installing the pitot tube on the 1 lateral wall of pipe fitting, be used for installing the sensor jack 12 of the sensor that awaits measuring, just pitot tube jack 11, sensor jack 12 all are located the air-out side of stationary flow filter screen 3 to the direction that air flows in the pipe fitting 1 is the back, fan 2 is located the place ahead of stationary flow filter screen 3, perhaps, fan 2 is located the rear of pitot tube jack 11 and sensor jack 12, in this embodiment, pitot tube jack 11, sensor jack 12 all are located between fan 2 and the stationary flow filter screen 3.
The current-stabilizing filter screen 3 is a gauze or a wire mesh, and the power supply 4 adopts a voltage-stabilizing power supply.
The fan 2 is connected to a power source 4 and a frequency converter 5, and two tube corners of the pitot tube are communicated with two interfaces of a micro manometer, namely a plus interface and a minus interface.
The micro-pressure meter adopts a compensation type micro-pressure meter, the atmospheric pressure detection device adopts an empty box barometer, and the air humidity detection device adopts a hygrometer.
Example two:
the utility model discloses still disclose one adopt embodiment one a flow and wind velocity transducer mark school process of marking of school device, including following step:
s1, respectively detecting atmospheric pressure P, temperature T and air humidity phi in the calibration environment by using an atmospheric pressure detection device, a temperature detection device and an air humidity detection device;
s2, calculating the air density of the calibration environment, wherein the formula is as follows:
this is equation ①, where:
rho-air Density, kg/m3(ii) a P-atmospheric pressure, Pa; t-absolute temperature, K, T273 + T, T-ambient camera temperature, deg.c;
-air humidity,%; pFull of-saturated steam pressure (found in table lookup), Pa;
s3, inserting the pitot tube into the pitot tube jack 11, starting the fan 2, adjusting the frequency converter 5 to different values, controlling the rotating speed of the fan 2, and obtaining the dynamic pressure H of the micro-manometer when the frequency converter 5 has different valuesMovable part，HMovable part＝HAll-purpose-HQuietIn which H isMovable partDynamic pressure, mmH2O；HAll-purposeFull pressure, mmH2O；HQuietStatic pressure, mmH2O；
S4, calculating the wind speed at the calibration point when the frequency converters 5 have different values, wherein the formula is as follows:
this is equation ②, where:
v is wind speed, m/s; hMovable partDynamic pressure, Pa, calculated by dividing HMovable partUnit of (1) is represented by mmH2O is converted into Pa by the formula of 1mmH2O is 9.8 Pa; c — pitot tube coefficient, NPL standard pitot, C ═ 0.998; rho-calibration point air density, kg/m3；
Recording the calculated wind speeds at the time calibration points of the different frequency converter 5 values as standard wind speeds;
through experiments, the air density of the measuring point ranges from 1.18 to 1.22kg/m3Therefore, equation ② can be optimized as:
this is the formula ④, where HReading-compensated micro-manometer measurement reading, mmH2Because the underground field measurement precision requirement is not particularly high, in order to meet the underground requirement and improve the calibration efficiency, the empirical formula ④ is adopted for quick calculation in practical application, and the calculation result is used as a standard value to calibrate the sensor;
s5, calculating the flow at the time calibration point of different frequency converter 5 values, wherein the formula is as follows:
Q＝60KVS
this is equation ③, where:
q-flow, m3Min; k is a flow field distribution coefficient, and K is 0.95-1.00; v is wind speed, m/s; s-pipe 1 internal diameter section area, m2In this embodiment, the cross-sectional area of the inner diameter of the pipe member 1 is 0.049m2；
Recording the calculated flow at the time calibration point of different frequency converter 5 values as standard flow;
and then, respectively verifying the calculated results by using a new air speed sensor and a new pipeline flow sensor with accurate measured values, wherein the calculation is accurate when the error is within 5 percent, and the steps S1-S5 are repeated when the error exceeds 5 percent, and the verification is performed again until the error is within 5 percent.
Specifically, the wind speed detection calculation results are shown in table 1:
TABLE 1 wind speed measurement value comparison table
As can be seen from Table 1, the error between the wind speed value measured by the calibration device and the display value of the fresh wind speed sensor is about 5%, only the 1 st data exceeds the error range, the measurement under the shaft with low precision requirement can be considered to meet the technical requirement of the industry, the subsequent calibration can be carried out, in addition, if the error requirement is low, the steps S1-S5 are repeated, and the verification is carried out again until the error is within 5%.
The flow measurement calculation results are shown in table 2:
TABLE 2 statistical table of pipeline flow measurement values
Through data comparison in table 2, the error between the pipeline flow value measured by the calibration device and the display value of the new pipeline flow sensor is about 5%, only the 1 st group of data exceeds the error range, and the pipeline flow sensor can be considered to meet the technical requirements of the industry in underground measurement with low precision requirements and can be subjected to subsequent calibration, and in addition, if the error requirements are low, the steps S1-S5 are repeated and the verification is carried out again until the error is within 5%.
And (3) the calculation result meets the industrial requirements, and then the calibration work of the sensor can be carried out:
s6, calibrating the wind speed sensor: inserting the wind speed sensor to be calibrated into the sensor jack 12, switching on the wind speed sensor to a sensor power supply, starting the fan 2, observing a wind speed display value of the wind speed sensor, comparing the wind speed display value with the calculation result in the step S4, calibrating the next frequency converter 5 in numerical value if the results are the same, operating the wind speed sensor by using a sensor remote controller if the results are different, enabling the wind speed sensor to enter a calibration state, correcting the display value of the wind speed sensor by taking the calculation result in the step S4 as a standard value in a calibration page, adjusting the frequency converter 5 to different numerical values after calibration is completed, repeating the steps, completing calibration of the wind speed sensor in different wind speeds, exiting the calibration page of the sensor after calibration is completed, closing the sensor power supply, and taking out the wind speed sensor;
s7, calibrating the flow sensor: inserting the flow sensor to be calibrated into the sensor jack 12, switching on the flow sensor to a sensor power supply, starting the fan 2, observing a flow display value of the flow sensor, comparing the flow display value with the calculation result in the step S5, calibrating the next frequency converter 5 in the numerical value if the results are the same, operating the sensor remote controller if the results are different, enabling the flow sensor to enter a calibration state, correcting the display value of the flow sensor by taking the calculation result in the step S5 as a standard value in a calibration page, adjusting the frequency converter 5 to different numerical values after calibration is completed, repeating the steps, completing calibration of the flow sensor in different flows, exiting the calibration page after calibration is completed, closing the sensor power supply, taking out the flow sensor, and closing the fan 2.
In addition, in order to ensure the calibration accuracy, the calibration can be performed twice during actual calibration, so as to ensure the calibration accuracy and reliability.
The working principle is as follows:
the method comprises the steps of firstly, respectively detecting atmospheric pressure, temperature and air humidity in a calibration environment by using an atmospheric pressure detection device, a temperature detection device and an air humidity detection device, then calculating the air density, then measuring dynamic pressures under different frequency converter 5 values by using a Pitot tube, calculating the wind speed and the flow at a calibration point when the frequency converters 5 have different values, taking the calculated value as a standard value, and then calibrating the flow and wind speed sensor.
The calibration device for the flow and wind speed sensors is developed, so that the requirements of independent calibration of various types of wind speed and pipeline flow sensors on a coal mine site are met, and the time and the fund required by the original calibration are saved. Before this, the period of returning the pipeline flow sensor to the factory for calibration is generally 30 days, and the calibration cost is 3000 yuan/set taking the light-force cyclic self-excitation type automatic metering as an example. After the calibration device is put into use, once the pipeline flow sensor rises to the well, the pipeline flow sensor is cleaned, overhauled, calibrated, warehoused and the like by maintainers, the calibration can be completed within 6 hours, calibration cost is not generated, and the measurement error of the calibrated sensor meets the national relevant standard.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides a flow and wind speed sensor calibration device which characterized in that: the device comprises a pipe fitting (1), a fan (2) and a steady flow filter screen (3) which are arranged on the pipe fitting (1), a power supply (4), a frequency converter (5), a pitot tube, a micro-pressure meter, an atmospheric pressure detection device, a temperature detection device and an air humidity detection device;
the side wall of the pipe fitting (1) is further provided with a pitot tube jack (11) for mounting a pitot tube and a sensor jack (12) for mounting a sensor to be detected, the pitot tube jack (11) and the sensor jack (12) are both positioned on the air outlet side of the steady flow filter screen (3), and the fan (2) is positioned in front of the steady flow filter screen (3) or the fan (2) is positioned behind the pitot tube jack (11) and the sensor jack (12) after the air flows in the pipe fitting (1);
the fan (2) is connected to the power supply (4) and the frequency converter (5);
the two tube angles of the pitot tube are communicated with the two interfaces of the micro-manometer.
2. The calibration device for a flow and wind speed sensor according to claim 1, wherein: the two ends of the pipe fitting (1) are both horn mouths, and the fan (2) is installed at the end part of the pipe fitting (1).
3. A calibration device for flow and wind speed sensors according to claim 1 or 2, characterized in that: the pitot tube jack (11) and the sensor jack (12) are both located between the fan (2) and the flow stabilizing filter screen (3).
4. The calibration device for a flow and wind speed sensor according to claim 1, wherein: the flow stabilizing filter screen (3) is a gauze or a wire mesh.
5. The calibration device for a flow and wind speed sensor according to claim 1, wherein: the power supply (4) adopts a stabilized voltage power supply.
6. The calibration device for a flow and wind speed sensor according to claim 1, wherein: the micro-pressure meter adopts a compensation type micro-pressure meter.
7. The calibration device for a flow and wind speed sensor according to claim 1, wherein: the atmospheric pressure detection device adopts an empty box barometer.
8. The calibration device for a flow and wind speed sensor according to claim 1, wherein: the air humidity detection device adopts a hygrometer.
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| CN201921375049.XU CN210135981U (en) | 2019-08-22 | 2019-08-22 | Flow and wind speed sensor calibration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361077A (en) * | 2019-08-22 | 2019-10-22 | 淮南矿业(集团)有限责任公司 | A kind of flow and air velocity transducer calibration device and Calibration Method |
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- 2019-08-22 CN CN201921375049.XU patent/CN210135981U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361077A (en) * | 2019-08-22 | 2019-10-22 | 淮南矿业(集团)有限责任公司 | A kind of flow and air velocity transducer calibration device and Calibration Method |
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