CN114136408A - Automatic calibrating device and method for high-precision flow nozzle - Google Patents
Automatic calibrating device and method for high-precision flow nozzle Download PDFInfo
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Abstract
一种高精度流量喷嘴的自动检定装置及方法，涉及高精度流量喷嘴的流量检定技术领域。解决了现有高精度流量喷嘴的流量检定装置存在操作复杂，人工计算量大，检定结果准确性差的问题。本发明采用储存水箱内存储足够量的循环水，并在检定前根据喷嘴设计工作温度，尽可能将水温加热到适当数值，每个工况检测前，切换阀置于“循环侧”，循环水返回循环水箱；检测时，切换阀快速切换至“测量侧”，循环水流入测量水箱，通过称重仪或液位测量仪测量水箱内水量的变化，检测结束后，快速将切换阀切换至“循环侧”，计算出流经喷嘴的平均流量，计算出该喷嘴的流出系数，与标准值进行比对。本发明适用于高精度流量喷嘴的自动检定。
An automatic verification device and method for high-precision flow nozzles relate to the technical field of flow verification of high-precision flow nozzles. It solves the problems of complicated operation, large amount of manual calculation and poor accuracy of the verification result in the flow verification device of the existing high-precision flow nozzle. The invention adopts the storage water tank to store a sufficient amount of circulating water, and before the verification, according to the designed working temperature of the nozzle, the water temperature is heated to an appropriate value as much as possible. Return to the circulating water tank; during the detection, the switching valve is quickly switched to the "measurement side", the circulating water flows into the measuring water tank, and the change of the water volume in the water tank is measured by a weighing instrument or a liquid level measuring instrument. After the detection, the switching valve is quickly switched to "" Circulation side", calculate the average flow through the nozzle, calculate the outflow coefficient of the nozzle, and compare it with the standard value. The invention is suitable for automatic verification of high-precision flow nozzles.
Description
Technical Field
The invention relates to the technical field of flow verification of high-precision flow nozzles.
Background
Some water flow rates important in industrial processes are often measured using high precision flow nozzles. For example, the mainstream flow of a power plant steam turbine plant performance assessment test is often measured using a low beta value throat pressure nozzle. Such a high-precision flow nozzle needs to be calibrated on a special test bed together with front and rear straight pipe sections.
The current flow calibrating device is complex to operate, large in manual calculation amount, limited by the level of calibrating personnel in a test result, and poor in accuracy of the calibrating result.
Disclosure of Invention
The invention aims to solve the problems of complex operation, large manual calculation amount and poor accuracy of a verification result of the conventional flow verification device for a high-precision flow nozzle, and provides an automatic verification device and method for the high-precision flow nozzle.
The invention relates to an automatic calibrating device of a high-precision flow nozzle, which comprises a storage water tank, a circulating water pump, a switching valve, a measuring water tank, a weighing measuring instrument, a liquid level measuring instrument, a controller, a first temperature sensor, a differential pressure transmitter, an electric heater, a flow nozzle to be detected and a connecting pipeline, wherein the storage water tank is connected with the circulating water pump;
the side wall of the storage water tank is provided with a water outlet, the water outlet of the storage water tank is connected with the water inlet of the high-precision flow nozzle through a connecting pipeline, the positive pressure end of the pressure difference transmitter is arranged on the water inlet side of the high-precision flow nozzle, and the negative pressure end of the pressure difference transmitter is arranged on the water outlet side of the high-precision flow nozzle; the signal output end of the differential pressure transmitter is connected with the differential pressure signal input end of the controller;
the water outlet of the high-precision flow nozzle is connected with the water inlet of the switching valve through a connecting pipeline, one water outlet of the switching valve is connected with the water inlet of the measuring water tank through a connecting pipeline, and the other water outlet of the switching valve is connected with the water inlet of the storage water tank through a connecting pipeline; the water inlet of the storage water tank is also connected with the water outlet of the measuring water tank; the switching control signal input end of the switching valve is connected with the switching control signal output end of the controller;
a circulating water pump is arranged on the water outlet side connecting pipeline of the storage water tank;
the circulating water pump is used for providing power for water circulation; the switch or variable frequency control signal input end of the circulating water pump is connected with the switch or variable frequency control signal output end of the controller; a first temperature sensor is arranged in the storage water tank; the first temperature sensor is used for collecting the water temperature in the storage water tank; sending the collected temperature signal to a controller;
the storage water tank is also internally provided with an electric heater which is used for heating the water in the storage water tank;
a liquid level measuring instrument is arranged on the side wall of the measuring water tank, and a weighing measuring instrument is arranged at the bottom of the measuring water tank;
the liquid level measuring instrument is used for detecting a liquid level signal of water in the measuring water tank and sending the detected liquid level signal to the controller;
the weighing measuring instrument is used for detecting the weight of the water tank and sending the detected weight to the controller;
the controller controls the heater to be turned on or off according to the practical application environment of the high-precision flow nozzle and the temperature signal acquired by the first temperature sensor;
the controller utilizes the liquid level signal and the weight signal of the measuring water tank of receipt, acquires liquid level variation, weight variation and liquid level change time, calculates the outflow coefficient of high accuracy flow nozzle according to the density of water and the pressure differential signal that the pressure differential changer acquireed again, and will outflow coefficient and outflow coefficient standard value contrast, realize the examination to high accuracy flow nozzle.
Furthermore, the invention also comprises a pressure transmitter, wherein the pressure transmitter is used for acquiring a water flow pressure signal at the water outlet side of the storage water tank; and the pressure signal output end of the pressure transmitter is connected with the pressure signal output end of the controller.
Furthermore, the high-precision flow nozzle water heater further comprises a second temperature sensor, wherein the signal output end of the second temperature sensor is used for detecting the temperature of water flowing out of the high-precision flow nozzle and is connected with the second temperature signal input end of the controller.
Further, in the present invention, the outflow coefficient C of the high-precision flow rate nozzle is:
wherein C is the discharge coefficient of the nozzle, QMD is the diameter of the throat of the nozzle, delta P is the differential pressure of the nozzle measured by a differential pressure transmitter, beta is the ratio of the diameter of the throat of the nozzle to the inner diameter of the pipeline, and rho iswIs the density of water.
Further, in the present invention, the measured mass flow rate QMComprises the following steps:
QM＝(Mend-Mstart)/Time
Mendfor measuring the weight of the tank at the end of the discharge of the tank, MstartTime is the Time it takes to discharge water to the measurement tank in order to begin discharging water to the tank.
Further, in the present invention, the standard value of the outflow coefficient is:
CASMEthe standard value of the outflow coefficient and Re are Reynolds numbers;
wherein mu is the kinematic viscosity of water, and V is the average flow velocity at the high-precision flow nozzle;
the method for calibrating the automatic calibrating device based on the high-precision flow nozzle comprises the following steps:
connecting a high-precision flow nozzle to be measured in series on a connecting pipeline at the water outlet side of the storage water tank;
calculating a verification flow interval and a Reynolds number range according to the application environment, pressure and flow of the high-precision flow nozzle and the ratio beta of the diameter of the throat part of the nozzle to the inner diameter of the pipeline; dividing a verification flow interval into 10 uniform verification points; respectively carrying out verification on each verification point, wherein the verification method of each verification point is the same, and specifically comprises the following steps:
step one, controlling an electric heater to heat water in a storage water tank according to the practical water temperature of a high-precision flow nozzle;
step two, controlling the frequency of the circulating water pump to enable the water flow to be the water flow corresponding to the verification point, and switching the switching valve to the side of the measuring water tank when the differential pressure value of the differential pressure transmitter is stable; acquiring a detection value of the differential pressure transmitter, controlling a water outlet of the switching valve to reach the side of the storage water tank when the water level of the water tank measured by the liquid level measuring instrument reaches 3/4 of a full range, and recording the time of switching the switching valve for two times and the gravity change of the measured water tank;
and step three, calculating the outflow coefficient C of the high-precision flow nozzle by using the detection value of the differential pressure transmitter, the ratio beta of the throat diameter of the high-precision flow nozzle to the inner diameter of the pipeline and the change weight and change time detected by the weighing and measuring instrument, and comparing the calculated outflow coefficient C of the high-precision flow nozzle with the standard value of the outflow coefficient to realize the verification of a verification point of the high-precision flow nozzle.
The storage water tank of the invention stores sufficient circulating water, and heats the water temperature to a proper value as much as possible according to the design working temperature of the nozzle before verification (under the condition of the same circulating water flow, the higher the circulating water temperature, the higher the Reynolds number of the circulating water flowing through the flow nozzle can be, the smaller the deviation between the Reynolds number of the verification environment and the Reynolds number of the actual working environment is, the higher the precision of the nozzle verification is). And starting the circulating water pump, and adjusting the flow of circulating water through frequency conversion. Before each working condition is detected, the switching valve is arranged on the 'circulation side', and circulating water returns to the circulating water tank; during detection, the switching valve is quickly switched to the 'measuring side', circulating water flows into the measuring water tank, the change of the water quantity in the water tank is measured by a weighing instrument (mass method) or a liquid level measuring instrument (volume method), after the detection is finished, the switching valve is quickly switched to the 'circulating side', and the circulating water returns to the circulating water tank. The average flow rate through the nozzle can be calculated by dividing the variation value of the water quantity in the measuring water tank by the measuring time. The flow rate and the differential pressure value measured by the differential pressure transmitter are used for calculating the outflow coefficient of the nozzle, and the outflow coefficient is compared with a standard value given by an ASME standard, so that the precision of the flow nozzle can be determined.
Drawings
FIG. 1 is a schematic diagram of an automatic calibration device for high-precision flow nozzles according to the present invention;
fig. 2 is a system schematic block diagram of the automatic calibration device for the high-precision flow nozzle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The first embodiment is as follows: the present embodiment is described below with reference to fig. 1, and the automatic calibration apparatus for a high-precision flow nozzle according to the present embodiment includes a storage water tank 1, a circulating water pump 2, a switching valve 3, a measurement water tank 4, a weighing and measuring instrument 5, a liquid level measuring instrument 6, a controller 12, a first temperature sensor 8, a differential pressure transmitter 10, an electric heater 11, a flow nozzle to be calibrated, and a connection pipe;
the side wall of the storage water tank 1 is provided with a water outlet, the water outlet of the storage water tank 1 is connected with the water inlet of the high-precision flow nozzle through a connecting pipeline, the positive pressure end of the differential pressure transmitter 10 is arranged on the water inlet side of the high-precision flow nozzle, and the negative pressure end of the differential pressure transmitter 10 is arranged on the water outlet side of the high-precision flow nozzle; the signal output end of the differential pressure transmitter 10 is connected with the differential pressure signal input end of the controller 12;
the water outlet of the high-precision flow nozzle is connected with the water inlet of the switching valve 3 through a connecting pipeline, one water outlet of the switching valve 3 is connected with the water inlet of the measuring water tank 4 through a connecting pipeline, and the other water outlet of the switching valve 3 is connected with the water inlet of the storage water tank 1 through a connecting pipeline; the water inlet of the storage water tank 1 is also connected with the water outlet of the measuring water tank 4; the switching control signal input end of the switching valve 3 is connected with the switching control signal output end of the controller 12;
a circulating water pump 2 is arranged on a water outlet side connecting pipeline of the storage water tank 1;
the circulating water pump 2 is used for providing power for water circulation; the switch or variable frequency control signal input end of the circulating water pump is connected with the switch or variable frequency control signal output end of the controller 12; a first temperature sensor 8 is arranged in the storage water tank 1; the first temperature sensor 8 is used for collecting the water temperature in the storage water tank 1; and sends the collected temperature signal to the controller 12;
an electric heater 11 is also arranged in the storage water tank 1, and the electric heater 11 is used for heating water in the storage water tank 1;
a liquid level measuring instrument 6 is arranged on the side wall of the measuring water tank 4, and a weighing measuring instrument 5 is arranged at the bottom of the measuring water tank 4;
the liquid level measuring instrument 6 is used for detecting and measuring a liquid level signal of water in the water tank 4 and sending the detected liquid level signal to the controller 12;
the weighing and measuring instrument 5 is used for detecting the weight of the water tank and sending the detected weight to the controller 12;
the controller 12 controls the electric heater 11 to be turned on or off according to the practical application environment of the high-precision flow nozzle and the temperature signal acquired by the first temperature sensor 8;
the controller 12 obtains the liquid level variation, the weight variation and the liquid level variation time by using the received liquid level signal and the weight signal of the measurement water tank 4, calculates the outflow coefficient of the high-precision flow nozzle according to the density of the water and the pressure difference signal obtained by the pressure difference transmitter, and compares the outflow coefficient with the standard value of the outflow coefficient to realize the verification of the high-precision flow nozzle.
The control accuracy of the high-accuracy flow nozzle according to the present embodiment is 0.1%. In the present embodiment, the storage tank has a volume of 2000m3The device has the functions of heat preservation and heating, and can improve and maintain the temperature of the test circulating water. The circulating water pump adopts frequency conversion adjustment, so that the flow of circulating water can be adjusted within the range of 50-3000 t/h. The quick switching valve is used for switching the flow direction of circulating water, and the action time is less than 0.1 second. The measuring water tank is used for measuring water flow by a volumetric method and a mass method, and the precision grade is +/-1 kg. The data acquisition system comprises 4 sets of differential pressure transmitters, 1 set of pressure transmitter, 2 sets of temperature sensors, 1 set of quality measuring device, 1 set of liquid level measuring device and a data measuring and calculating control system for acquiring, calculating and analyzing the data.
Further, in the present embodiment, the water storage tank further comprises a pressure transmitter 7, wherein the pressure transmitter 7 is used for acquiring a water flow pressure signal of the water outlet side of the water storage tank 1; and the pressure signal output end of the pressure transmitter 7 is connected with the pressure signal output end of the controller 12.
Further, in the present embodiment, a second temperature sensor 9 is further included, and a signal output terminal of the second temperature sensor 9 for detecting the temperature of the water flowing out from the high-precision flow nozzle is connected to a second temperature signal input terminal of the controller 12.
In the present embodiment, in order to more accurately obtain the density of water at different temperature and pressure, the density of water flowing through the high-precision flow nozzle is calculated by measuring the pressure value by the pressure transmitter 7 and the temperature value by the temperature sensor (9).
Further, in the present embodiment, the discharge coefficient C of the nozzle is:
wherein C is the discharge coefficient of the nozzle, QMD is the diameter of the throat of the nozzle, delta P is the differential pressure of the nozzle measured by a differential pressure transmitter, beta is the ratio of the diameter of the throat of the nozzle to the inner diameter of the pipeline, and rho iswIs the density of water.
In the real-time mode, the density of the water is obtained by calculation according to the data measured by the pressure transmitter and the temperature sensor, so that the precision of the measurement result is effectively improved.
Further, in the present embodiment, the actually measured mass flow rate QMComprises the following steps:
QM＝(Mend-Mstart)/Time
Mendfor measuring the weight of the tank at the end of the discharge of the tank, MstartTime is the Time it takes to discharge water to the measurement tank in order to begin discharging water to the tank.
In the present embodiment, the mass flow rate is the difference between the weight measured at the end time of water discharge from the measuring tank and the weight measured at the start time divided by the time QM＝(Mend-Mstart)/Time。
Further, in the present embodiment, the standard value of the outflow coefficient is:
CASMEthe standard value of the outflow coefficient and Re are Reynolds numbers;
wherein mu is the kinematic viscosity of water, and V is the average flow velocity at the high-precision flow nozzle;
the method for calibrating the automatic calibrating device based on the high-precision flow nozzle comprises the following steps:
connecting a high-precision flow nozzle to be measured in series on a connecting pipeline at the water outlet side of the storage water tank 1;
calculating a verification flow interval and a Reynolds number range according to the application environment, pressure and flow of the high-precision flow nozzle and the ratio beta of the diameter of the throat part of the nozzle to the inner diameter of the pipeline; dividing a verification flow interval into 10 uniform verification points; respectively carrying out verification on each verification point, wherein the verification method of each verification point is the same, and specifically comprises the following steps:
step one, controlling an electric heater 11 to heat water in a storage water tank 1 according to the actual water temperature of a high-precision flow nozzle;
step two, controlling the frequency of the circulating water pump 2 to enable the water flow to be the water flow corresponding to the verification point, and switching the switching valve 3 to the side of the measuring water tank 4 when the differential pressure value of the differential pressure transmitter 10 is stable; acquiring a detection value of the differential pressure transmitter 10, controlling a water outlet of the switching valve 3 to reach the side of the storage water tank 1 until the liquid level measuring instrument 4 measures that the water level of the water tank reaches 3/4 of a full range, and recording the time of two times of switching of the switching valve 3 and the gravity change of the measuring water tank 4;
and step three, calculating the outflow coefficient C of the high-precision flow nozzle by using the detection value of the differential pressure transmitter 10, the ratio beta of the throat diameter of the high-precision flow nozzle to the inner diameter of the pipeline and the change weight and change time detected by the weighing and measuring instrument, and comparing the calculated outflow coefficient C of the high-precision flow nozzle with a standard outflow coefficient value to realize the verification of a verification point of the high-precision flow nozzle.
In the invention, a flow nozzle to be detected is firstly connected into the device, the controller 12 calculates the detection flow and the Reynolds number range according to recorded nozzle design parameters (pressure, temperature, flow, aperture ratio beta and the like), and a detection interval is divided into 10 uniform detection points. Based on the calculated reynolds number, the electric heater 11 is activated to heat the circulating water in the storage tank 1 to a desired temperature, which is monitored by the temperature sensor 8. Switching a switching valve 3 to a circulation side, starting a circulating water pump 2, adjusting the flow of circulating water to a 1 st detection point through frequency conversion, putting a pressure transmitter 7, a temperature sensor 9 and a differential pressure transmitter 10 into use, after the water level of a measuring water tank 4 is lowered to a low water level, closing a water drain valve, recording the initial value of a liquid level measuring instrument 6, and quickly switching the switching valve 3 to the measurement side after the flow is stable (the fluctuation of the reading of the differential pressure transmitter is less than 0.01%), and recording the starting time and all parameters, and when the liquid level measuring instrument 6 displays that the water level of the measuring water tank 4 reaches about 3/4 of a full range, quickly switching the switching valve 3 to the circulation side and recording the ending time. This concludes the assay at the 1 st assay site. And increasing the flow of the circulating water to the 2 nd detection point through frequency conversion, repeating the detection process after the flow is stable (the reading fluctuation of the differential pressure transmitter is less than 0.01 percent), and completing the detection of the 3 rd to 10 th detection points by analogy. And then, gradually reducing the flow of circulating water through frequency conversion to finish the repeatability test of the 10 th-1 st detection point until all detection works are finished. The measurements of the upstroke and return stroke are averaged.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (7)
1. The automatic calibrating device for the high-precision flow nozzle is characterized by comprising a storage water tank (1), a circulating water pump (2), a switching valve (3), a measuring water tank (4), a weighing measuring instrument (5), a liquid level measuring instrument (6), a controller (12), a first temperature sensor (8), a differential pressure transmitter (10), an electric heater (11) and a connecting pipeline;
a water outlet is formed in the side wall of the storage water tank (1), the water outlet of the storage water tank (1) is connected with a water inlet of the high-precision flow nozzle through a connecting pipeline, a positive pressure end of the pressure difference transmitter (10) is arranged on the water inlet side of the high-precision flow nozzle, and a negative pressure end of the pressure difference transmitter (10) is arranged on the water outlet side of the high-precision flow nozzle; the signal output end of the differential pressure transmitter (10) is connected with the differential pressure signal input end of the controller (12);
the water outlet of the high-precision flow nozzle is connected with the water inlet of the switching valve (3) through a connecting pipeline, one water outlet of the switching valve (3) is connected with the water inlet of the measuring water tank (4) through a connecting pipeline, and the other water outlet of the switching valve (3) is connected with the water inlet of the storage water tank (1) through a connecting pipeline; the water inlet of the storage water tank (1) is also connected with the water outlet of the measuring water tank (4); the switching control signal input end of the switching valve (3) is connected with the switching control signal output end of the controller (12);
a circulating water pump (2) is arranged on a water outlet side connecting pipeline of the storage water tank (1);
the circulating water pump (2) is used for providing power for water circulation; the switch or variable frequency control signal input end of the circulating water pump is connected with the switch or variable frequency control signal output end of the controller (12); a first temperature sensor (8) is arranged in the storage water tank (1); the first temperature sensor (8) is used for collecting the water temperature in the storage water tank (1); and sending the collected temperature signal to a controller (12);
an electric heater (11) is also arranged in the storage water tank (1), and the electric heater (11) is used for heating water in the storage water tank (1);
a liquid level measuring instrument (6) is arranged on the side wall of the measuring water tank (4), and a weighing measuring instrument (5) is arranged at the bottom of the measuring water tank (4);
the liquid level measuring instrument (6) is used for detecting and measuring a liquid level signal of water in the water tank (4) and sending the detected liquid level signal to the controller (12);
the weighing measuring instrument (5) is used for detecting the weight of the water tank and sending the detected weight to the controller (12);
the controller (12) controls the electric heater (11) to be turned on or off according to the practical application environment of the high-precision flow nozzle and the temperature signal acquired by the first temperature sensor (8);
the controller (12) acquires liquid level variation, weight variation and liquid level variation time by using the received liquid level signal and weight signal of the measuring water tank (4), calculates the outflow coefficient C of the high-precision flow nozzle according to the density of water and the pressure difference signal acquired by the pressure difference transmitter, and compares the outflow coefficient C with the standard value C of the outflow coefficientASMEAnd comparing to realize the verification of the high-precision flow nozzle.
2. The automatic calibrating device for the high-precision flow nozzle according to claim 1, further comprising a pressure transmitter (7), wherein the pressure transmitter (7) is used for collecting a water flow pressure signal of the water outlet side of the storage water tank (1); and the pressure signal output end of the pressure transmitter (7) is connected with the pressure signal output end of the controller (12).
3. The automatic calibrating device for the high-precision flow nozzle as claimed in claim 1, further comprising a second temperature sensor (9), wherein a signal output end of the second temperature sensor (9) for detecting the temperature of the water flowing out from the high-precision flow nozzle is connected with a second temperature signal input end of the controller (12).
4. The automatic calibrating apparatus for a high-precision flow nozzle according to claim 1, wherein the discharge coefficient C of the high-precision flow nozzle is:
in the formula, QMD is the diameter of the throat of the nozzle, delta P is the differential pressure of the nozzle measured by a differential pressure transmitter, beta is the ratio of the diameter of the throat of the nozzle to the inner diameter of the pipeline, and rho iswIs the density of water.
5. Root of herbaceous plantAn automated calibration device for high precision flow nozzles according to claim 4, characterized by the measured mass flow QMComprises the following steps:
QM＝(Mend-Mstart)/Time
Mendfor measuring the weight of the tank at the end of the discharge of the tank, MstartTime is the Time it takes to discharge water to the measurement tank in order to begin discharging water to the tank.
6. An automatic calibrating device for high-precision flow nozzle according to claim 4, characterized in that the standard value of the discharge coefficient is:
CASMEthe standard value of the outflow coefficient and Re are Reynolds numbers;
wherein mu is the kinematic viscosity of water, and V is the average flow velocity at the high-precision flow nozzle;
7. the method for calibrating an automatic calibrating apparatus for a high-precision flow nozzle according to claims 1 to 6, wherein the method comprises:
connecting a high-precision flow nozzle to be measured in series on a connecting pipeline at the water outlet side of the storage water tank (1);
calculating a verification flow interval and a Reynolds number range according to the application environment, pressure and flow of the high-precision flow nozzle and the ratio beta of the diameter of the throat part of the nozzle to the inner diameter of the pipeline; dividing a verification flow interval into 10 uniform verification points; respectively carrying out verification on each verification point, wherein the verification method of each verification point is the same, and specifically comprises the following steps:
step one, controlling an electric heater (11) to heat water in a storage water tank (1) according to the actual applied water temperature of a high-precision flow nozzle;
secondly, controlling the frequency of the circulating water pump (2) to enable the water flow to be the water flow corresponding to the verification point, and enabling the switching valve (3) to be switched to the side of the measurement water tank (4) when the differential pressure value of the differential pressure transmitter (10) is stable; acquiring a detection value of the differential pressure transmitter (10), controlling a water outlet of the switching valve (3) to reach the side of the storage water tank (1) until the liquid level measuring instrument (4) measures that the water level of the water tank reaches 3/4 of a full range, and recording the time of two times of switching of the switching valve (3) and the gravity change of the measuring water tank (4);
and step three, calculating the outflow coefficient C of the high-precision flow nozzle by using the detection value of the differential pressure transmitter (10), the ratio beta of the throat diameter of the high-precision flow nozzle to the inner diameter of the pipeline and the change weight and change time detected by the weighing and measuring instrument, and comparing the calculated outflow coefficient C of the high-precision flow nozzle with a standard outflow coefficient value to realize the verification of one verification point of the high-precision flow nozzle.
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| CN119714481A (en) * | 2024-12-04 | 2025-03-28 | 江苏中科能源动力研究中心 | Nozzle and blade flow detection test system and method with correction calculation |
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