CN106017620B - Intelligent piston volume tube calibrating device - Google Patents
Intelligent piston volume tube calibrating device Download PDFInfo
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- CN106017620B CN106017620B CN201610612909.1A CN201610612909A CN106017620B CN 106017620 B CN106017620 B CN 106017620B CN 201610612909 A CN201610612909 A CN 201610612909A CN 106017620 B CN106017620 B CN 106017620B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
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Abstract
The invention discloses an intelligent piston volume tube calibrating device, which comprises a piston volume tube, a constant temperature control unit, a circulating pump set and a calibrating system, wherein the piston volume tube is sequentially connected with the circulating pump set, the constant temperature control unit and the calibrating system respectively; the constant temperature control unit comprises a refrigerating unit, a filling and discharging system and a heating unit, the circulating pump set comprises an air compressor, a pressurizing valve and an oil pump, the outlet end of the air compressor is connected with the inlet end of the pressurizer, an upper detecting switch and a lower detecting switch are arranged in the pressurizing valve, the control output end of the upper detecting switch is connected with the stop input end of the oil pump, and the control output end of the lower detecting switch is connected with the start input end of the oil pump. The invention adopts the intelligent piston volume tube, abandons the method of correcting the standard volume of the traditional ball volume tube by theory and experience, and directly judges the most sensitive parameters affecting the calibration uncertainty through a physical detection method for detecting the sealing leakage of the piston, the change of the diameter of the volume tube, the bubble-containing condition of liquid, the deformation degree of a pipeline and the running stability degree of the piston on line in real time, so as to improve the reliability of uncertainty estimation.
Description
Technical Field
The invention relates to a verification device, in particular to an intelligent piston volume tube verification device.
Background
The traditional ball type volume pipe can greatly influence the accuracy of heat energy metering in the modes of metering flow, temperature and heat energy; in order to ensure the accuracy of heat energy metering of the flowmeter, the flowmeter is required to have flow metering accuracy, temperature metering accuracy, heat energy calculation accuracy and the like meeting certain requirements; thus, the flow meter typically receives flow verification, temperature verification, and computational verification prior to shipping or during maintenance or the like.
At present, the implementation manner of flow verification on the traditional ball type volume tube is generally as follows: the flow verification system comprises a pump, a surge tank, a standard meter, a flow meter to be detected and a water tank/water pool, wherein firstly, the pump pumps media out of the water tank/water pool, and the media flow back to the water tank/water pool after sequentially flowing through the pump, the surge tank, the standard meter and the flow meter to be detected. The flow meter to be detected can be adjusted by the verification personnel according to the metering adaptability of the standard meter to the flow, so that the metering result of the volume tube to be detected to the flow is the same as the metering result of the standard meter to the flow as far as possible, and the metering accuracy of the flow of the volume tube to be detected can meet certain requirements.
In existing ball-type volumetric tube verification systems, the water tank/basin is typically open and heat loss is very high; meanwhile, the difference between the flow verification system and the actual heating and ventilation working condition is quite large, and when the flow meter verified by the flow verification system is applied to the actual heating and ventilation working condition, a larger error exists in the flow metering result, so that the energy loss and the flow verification accuracy of the existing flow verification system are still to be further improved.
Disclosure of Invention
The invention aims to solve the problems and provide an intelligent piston volume tube verification device.
The invention realizes the above purpose through the following technical scheme:
the invention comprises a piston volume pipe, a constant temperature control unit, a circulating pump set and a verification system, wherein the piston volume pipe is sequentially connected with the circulating pump set, the constant temperature control unit and the verification system respectively; the constant temperature control unit comprises a refrigerating unit, a filling and discharging system and a heating unit, the circulating pump set comprises an air compressor, a pressurizer and an oil pump, the outlet end of the air compressor is connected with the inlet end of the pressurizer through a pressure stabilizing tank and a pressure regulating valve, an upper detection switch and a lower detection switch are arranged in the pressurizer, the control output end of the upper detection switch is connected with the stop input end of the oil pump, and the control output end of the lower detection switch is connected with the start input end of the oil pump.
Further, the verification system comprises at least two verification lines, and the matched verification pipes with different apertures can be used for installing the flowmeter with different apertures.
Specifically, a circulating pipeline stop valve is arranged on the circulating pump set, and the circulating pipeline stop valve is arranged in a closed circulating passage of the circulating pump set.
Further, a degassing filter is arranged on the oil pump, an electric valve is arranged at the outlet end of the degassing filter, and the outlet end of the electric valve is connected with the volume pipe body.
Specifically, the outlet end of the air compressor is sequentially provided with a voltage stabilizer and a pressure regulating valve.
Further, the constant temperature control unit comprises a calibration pipe and a heat exchanger unit, the calibration pipe is in circulating connection with the heat exchanger unit, a temperature transmitter, a standard meter and a temperature regulator are arranged on the calibration pipe, the output end of the temperature transmitter and the output end of the standard meter are respectively connected with the input end of the temperature regulator, and the output end of the temperature regulator is connected with the control output end of the heat exchanger unit.
Specifically, the temperature regulator comprises a comparator, a PID controller and a frequency converter, wherein the output end of the calibration tube is connected with the input end of the comparator, the output end of the comparator is connected with the input end of the PID controller, the output end of the PID controller is connected with the input end of the frequency converter, and the control output end of the frequency converter is connected with the heat exchanger unit.
Further, the heat exchanger unit comprises a heat exchanger, a refrigerating unit and a water pump, the calibration pipe is in circulating connection with the heat exchanger, a heat exchange port of the refrigerating unit is connected with a heat exchange port of the heat exchanger, the water pump is arranged between the heat exchanger and the refrigerating unit, and a control output end of the temperature regulator is connected with a control input end of the water pump.
The invention adopts the intelligent piston volume tube, abandons the method of correcting the standard volume of the traditional ball volume tube by theory and experience, and directly judges the most sensitive parameters affecting the calibration uncertainty through a physical detection method for detecting the sealing leakage of the piston, the change of the diameter of the volume tube, the bubble-containing condition of liquid, the deformation degree of a pipeline and the running stability degree of the piston on line in real time, so as to improve the reliability of uncertainty estimation.
Drawings
FIG. 1 is a plan view of the present invention;
FIG. 2 is a process diagram of the volume tube of the present invention;
FIG. 3 is a block diagram of the circulation pump set of the present invention;
fig. 4 is a schematic structural view of the thermostatic control unit of the present invention;
FIG. 5 is a diagram of the volumetric tube provenance chain of the present invention;
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, 2 and 3, the invention comprises a piston volume pipe, a constant temperature control unit, a circulating pump set and a verification system, wherein the piston volume pipe is sequentially connected with the circulating pump set, the constant temperature control unit and the verification system respectively; the constant temperature control unit comprises a refrigerating unit, a filling and discharging system and a heating unit, the circulating pump set comprises an air compressor, a pressurizer and an oil pump, the outlet end of the air compressor is connected with the inlet end of the pressurizer through a pressure stabilizing tank and a pressure regulating valve, an upper detection switch and a lower detection switch are arranged in the pressurizer, the control output end of the upper detection switch is connected with the stop input end of the oil pump, and the control output end of the lower detection switch is connected with the start input end of the oil pump.
The verification system comprises at least two verification lines, and the matched verification pipes with different apertures can be used for installing the flowmeter with different apertures.
The circulating pump set is provided with a circulating pipeline stop valve, and the circulating pipeline stop valve is arranged in a closed circulating passage of the circulating pump set.
The oil pump is provided with a degassing filter, an outlet end of the degassing filter is provided with an electric valve, and an outlet end of the electric valve is connected with the volume pipe body.
And the outlet end of the air compressor is sequentially provided with a voltage stabilizer and a pressure regulating valve.
The constant temperature control unit comprises a calibration pipe and a heat exchanger unit, the calibration pipe is in circulating connection with the heat exchanger unit, a temperature transmitter, a standard meter and a temperature regulator are arranged on the calibration pipe, the output end of the temperature transmitter and the output end of the standard meter are respectively connected with the input end of the temperature regulator, and the output end of the temperature regulator is connected with the control output end of the heat exchanger unit.
The temperature regulator comprises a comparator, a PID controller and a frequency converter, wherein the output end of the calibration tube is connected with the input end of the comparator, the output end of the comparator is connected with the input end of the PID controller, the output end of the PID controller is connected with the input end of the frequency converter, and the control output end of the frequency converter is connected with the heat exchanger unit.
The heat exchanger unit comprises a heat exchanger, a refrigerating unit and a water pump, the calibration tube is in circular connection with the heat exchanger, a heat exchange port of the refrigerating unit is connected with a heat exchange port of the heat exchanger, the water pump is arranged between the heat exchanger and the refrigerating unit, and a control output end of the temperature regulator is connected with a control input end of the water pump
The filling pipeline (DN 80) is composed of an oil pump, a one-way valve, a degassing filter and an electric valve. The inlet of the self-priming pump is connected with the oil storage tank, an electric valve and the oil pump in the filling pipeline are opened, medium is filled into the verification pipeline, in the filling process, gas in the pipeline is automatically discharged through a floating ball exhaust valve arranged at a high position, and after filling is finished, the pressurizer is started to increase the pressure of the pipeline to a set pressure. Meanwhile, the pressurizer has a liquid automatic compensation function.
When the system needs to be emptied, an electric emptying valve arranged at the bottom of the pipeline is opened, medium is discharged to the oil storage tank in a self-flowing mode, and in the emptying process, a floating ball exhaust valve is automatically opened, and all emptying and exhaust pipelines are collected to the oil storage tank.
After the circulation loop is filled with medium, the system is pressurized to a set pressure by a pressurizer. In the operation process, the residual gas in the pipeline is discharged, the system pressure is reduced due to factors such as volume reduction caused by medium temperature reduction, and the like, and at the moment, the pressurizer automatically compensates the missing liquid to automatically increase the system pressure to a set pressure value.
In the operation process, the pressure of the system is increased due to the increase of the medium temperature and other factors, and at the moment, the pressurizer automatically increases the volume of the closed loop, so that the pressure of the system is reduced to a set pressure value, the pressure setting range is 0-0.75MPa, and the maximum compensation volume is 200L.
A standard three-step ring gauge (uncertainty of 0.002%) is arranged at the tail end of the intelligent piston volume pipe, 12 (one every 30 degrees) distance sensors are arranged on the invar alloy base ring which moves along with the piston and are used for detecting the change of the diameter of the volume pipe relative to the standard ring gauge in real time;
the pressure difference and seal leakage detection is used for detecting abrasion and internal sealing conditions of the seal ring in the running process; the temperature sensors are used for correcting sensitive parameters in real time and checking the safety inside the piston; the acceleration sensor is used for proving the speed stability of the piston in verification time; a radial angle sensor for checking the inconsistency of the piston position caused by the abrasion of the piston slide bar; the processor, the memory, the converter, the battery pack, the wireless transmitter and the like are arranged in the piston closed space, process real-time signals at high speed, and feed back the piston movement condition and related operation results to the external processing unit.
The 12 sensors are mounted on an invar base ring that moves with the piston, and the gap between the base ring and the wall of the volume tube is found by comparison with a standard ring gauge (made of the wall material of the volume tube) mounted at the end of the volume tube. The bulk expansion coefficient of the sensor is about 0.001 mm/deg.c.
The response time of the sensor was 0.5ms and at the highest operating speed of the piston (about 1.5 m/s), almost every 0.75mm of operation, the diameter could be measured. When the piston is slowly run to the end of the volume tube, each sensor will be recalibrated by a standard three-step ring gauge.
The piston on the volume pipe is provided with a detection switch, and the detection switch is triggered by a pulse trigger metal ring arranged on the piston. The standard volume of the volume tube depends in part on the distance between the detection switches mounted on the wall of the volume tube.
The accuracy calibration of the triggering of the detection switch is carried out by means of a calibration piston, on the centre line of which a laser reflector is mounted. The end of the volume tube is connected with a laser interferometer, the calibration piston is mechanically pulled through the open volume tube, when the piston trigger ring passes through the detection switch, the laser interferometer quickly records the current distance, and the same process passes through the next detection switch. By calculating the distance difference between the detection switches, accurate calibration of the length measurement is realized. The accuracy of each test switch is approximately 0.5mm due to test point air refractive index and reproducibility effects of the test switch. Further, if one of the detection switches is replaced or the detection switch is not mounted at the same position as the last time, the 20m total length has an uncertainty of 2mm through a plurality of test calculations.
In this embodiment, specific parameters of the piston volume tube are as follows:
the verification method comprises the following steps: volume tube method (uncertainty less than or equal to 0.02%) and standard meter method (uncertainty less than or equal to 0.05%)
And (3) detecting the flow range: 5-1100 m3/h
Caliber of the detected flowmeter: DN 50-DN 300mm
Assay medium: crude oil, seven oil, white oil and natural gas
Temperature stability: is better than 0.5 DEG C
Working pressure: 2.5MPa to 25MPa
Temperature range: 5-55 DEG C
As shown in fig. 5, from the traceable chain, the transfer of the measurement standard is based on the measurement of the standard volume by comparing the diameter of the volume tube on line with a multi-step ring gauge and measuring the length between the two detection switches of the volume tube with a laser interferometer, with transparent uncertainty analysis.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (1)
1. An intelligent piston volume pipe calibrating installation, includes piston volume pipe, its characterized in that: the piston volume pipe is sequentially connected with the circulating pump group, the constant temperature control unit and the verification system respectively; the constant temperature control unit comprises a refrigerating unit, a filling and discharging system and a heating unit, the circulating pump set comprises an air compressor, a pressurizer and an oil pump, the outlet end of the air compressor is connected with the inlet end of the pressurizer through a pressure stabilizing tank and a pressure regulating valve, an upper detection switch and a lower detection switch are arranged in the pressurizer, the control output end of the upper detection switch is connected with the stop input end of the oil pump, and the control output end of the lower detection switch is connected with the start input end of the oil pump;
the constant temperature control unit comprises a calibration pipe and a heat exchanger unit, the calibration pipe is in circulating connection with the heat exchanger unit, a temperature transmitter, a standard meter and a temperature regulator are arranged on the calibration pipe, the output end of the temperature transmitter and the output end of the standard meter are respectively connected with the input end of the temperature regulator, and the output end of the temperature regulator is connected with the control output end of the heat exchanger unit;
the temperature regulator comprises a comparator, a PID controller and a frequency converter, wherein the output end of the calibration tube is connected with the input end of the comparator, the output end of the comparator is connected with the input end of the PID controller, the output end of the PID controller is connected with the input end of the frequency converter, and the control output end of the frequency converter is connected with the heat exchanger unit;
the heat exchanger unit comprises a heat exchanger, a refrigerating unit and a water pump, the calibration tube is in circulating connection with the heat exchanger, a heat exchange port of the refrigerating unit is connected with a heat exchange port of the heat exchanger, the water pump is arranged between the heat exchanger and the refrigerating unit, and a control output end of the temperature regulator is connected with a control input end of the water pump;
the oil pump is provided with a degassing filter, the outlet end of the degassing filter is provided with an electric valve, and the outlet end of the electric valve is connected with the volume pipe body;
the outlet end of the air compressor is sequentially provided with a voltage stabilizer and a pressure regulating valve;
the verification system comprises at least two verification lines, and the matched verification pipes with different apertures can be used for installing flow meters with different apertures;
the circulating pump set is provided with a circulating pipeline stop valve which is arranged in a closed circulating passage of the circulating pump set;
the oil pump, the one-way valve, the degassing filter and the electric valve form a filling pipeline; the method comprises the steps that an oil pump inlet is connected with an oil storage tank, an electric valve in a filling pipeline is opened with the oil pump, medium is filled into the verification pipeline, gas in the pipeline is automatically discharged through a floating ball exhaust valve arranged at a high position in the filling process, and after filling is finished, a pressurizer is started to increase the pressure of the pipeline to a set pressure; the pressurizer has the function of automatic liquid compensation;
when the system needs to be emptied, an electric emptying valve arranged at the bottom of the pipeline is opened, a medium is discharged to the oil storage tank in a self-flowing mode, and in the emptying process, a floating ball exhaust valve is automatically opened, and all emptying and exhaust pipelines are collected to the oil storage tank; after the circulation loop is filled with medium, pressurizing the system to a set pressure through a pressurizer; in the operation process, the residual gas in the pipeline is discharged, the volume is reduced due to the decrease of the medium temperature, the system pressure is reduced, the pressurizer automatically compensates the missing liquid at the moment, and the system pressure is automatically increased to a set pressure value;
in the operation process, the pressure of the system is increased due to the increase of the medium temperature, the pressurizer automatically increases the volume of the closed loop, the pressure of the system is reduced to a set pressure value, the pressure setting range is 0-0.75MPa, and the maximum compensation volume is 200L; a standard three-step ring gauge is arranged at the tail end of the intelligent piston volume pipe, the uncertainty of the standard three-step ring gauge is 0.002%, 12 distance sensors are arranged on an invar alloy base ring moving along with the piston, one sensor is arranged at each 30 DEG, and the standard three-step ring gauge is used for detecting the change of the diameter of the volume pipe relative to the standard ring gauge in real time; the distance sensor is compared with a standard three-step ring gauge arranged at the tail end of the volume pipe to obtain a gap between the base ring and the wall of the volume pipe;
a detection switch is arranged on a piston on the intelligent piston volume pipe and is triggered by a pulse trigger metal ring arranged on the piston; the standard volume of the intelligent piston volume tube is partially dependent on the distance between the detection switches mounted on the wall of the volume tube;
the accuracy calibration of the triggering of the detection switch is realized by means of a calibration piston, and a laser reflector is arranged on the central line of the calibration piston; the end of the intelligent piston volume tube is connected with a laser interferometer, the calibration piston is mechanically pulled through the open volume tube, when the piston trigger ring passes through the detection switch, the laser interferometer quickly records the current distance, the same process passes through the next detection switch, and the accurate calibration of the length measurement is realized by calculating the distance difference between the detection switches.
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| CN201610612909.1A CN106017620B (en) | 2016-07-30 | 2016-07-30 | Intelligent piston volume tube calibrating device |
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| CN201610612909.1A CN106017620B (en) | 2016-07-30 | 2016-07-30 | Intelligent piston volume tube calibrating device |
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| CN106643992B (en) * | 2016-12-28 | 2023-05-23 | 新乡航空工业(集团)有限公司 | No. 15 aviation hydraulic oil micro-flow standard device |
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