CN205580574U - Examine and determine pVTt method gas flow standard device fast - Google Patents

Examine and determine pVTt method gas flow standard device fast Download PDF

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Publication number
CN205580574U
CN205580574U CN201620366638.1U CN201620366638U CN205580574U CN 205580574 U CN205580574 U CN 205580574U CN 201620366638 U CN201620366638 U CN 201620366638U CN 205580574 U CN205580574 U CN 205580574U
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China
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standard
pvtt
gas flow
refrigerating plant
switch valve
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CN201620366638.1U
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徐志鹏
李澜吉
洪育仙
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China Jiliang University
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China Jiliang University
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Abstract

The utility model discloses an examine and determine pVTt method gas flow standard device fast. Including volumetric standard, controller, heating device, refrigerating plant, electric fan and vacuum pump, the volumetric standard is inside to be equipped with the horizontal wind channel from the front end to the rear end, is examined the sound velocity nozzle and is connected to the front end in horizontal wind channel through flow sensor, and the rear end in horizontal wind channel is equipped with electric fan, the volumetric standard is connected with vacuum pump, heating device and refrigerating plant, all stretches into horizontal wind channel on heating device and the refrigerating plant, and flow sensor, heating device, refrigerating plant, electric fan and vacuum pump all are connected to the controller. The device of the utility model is simple in structure, the low price can be used to examine and determine fast pVTt method gas flow, and measurement accuracy and efficiency are good.

Description

A kind of rapid verification pVTt method gas flow standard device
Technical field
This utility model relate to a kind of standard set-up, has especially related to a kind of rapid verification pVTt method gas Flow standard device.
Background technology
PVTt method detection of gas flow rate device is a kind of widely used original level gas flow standard metering device And equipment, its class of accuracy is high, and uncertainty of measurement U is up to 0.07% or higher, usually used as secondary The simple standard set-up of the magnitude tracing of the critical flow effusion meters such as the Venturi nozzle of standard use, sonic nozzle And equipment.
The most widely used simple standard set-up mainly include bell-jar, active piston formula, pVTt method and Mt method gas flow standard device etc..In simple standard set-up, pVTt method gas flow standard device standard The parameters such as container volume is fixing, the pressure and temperature of participation flow rate calculation are again to be measured by static mode Obtaining, therefore measurement device precision is prone to ensure.PVTt subtraction unit and bell type gas flow standard set-up phase Ratio, owing to there is not liquid seal link, pVTt subtraction unit decrease because of gas humidity bring more greatly accurate Spend low problem.Compared with mt method gas flow standard device, pVTt subtraction unit then can use negative pressure method work Making principle, the omission of high-pressure air source equipment decreases input while reducing plant construction difficulty. Compared with active piston formula gas flow standard device, the flow rate upper limit of pVTt subtraction unit then has to be widened the most greatly, Therefore pVTt method gas flow standard device has very important status in measurement of gas flow system.
China's existing pVTt method gas flow standard device can be examined range of flow and reach as high as 2000m3/ h is minimum For 0.001m3/ h, but such device quantity domestic is few, and and along with flow measurement scope is towards polarization Direction is developed, and calibrating scope urgently extends, and the most many aerodynamics problems wait to research and solve.
PVTt method gas flow meter still there is problems in that the measurement in order to ensure pVTt subtraction unit is accurate Property, it is necessary to the mean temperature in volumetric standard could be taken out under the sufficiently stable state in temperature field and pressure is used In the calculating of mass flow, but the bigger volumetric standard evacuation of volume and air inlet to terminate rear temperature field stable Time-consuming longer, need about one hour, the whole re-testing periods are longer.
Utility model content
For above-mentioned deficiency present in prior art, this utility model has aimed to provide a kind of rapid verification PVTt method gas flow standard device, this utility model apparatus structure is simple, cheap, and certainty of measurement is high, Measurement efficiency is high.
To achieve these goals, the technology design that this utility model is used is:
In order to make air preferably be uniformly distributed, in standard set-up, it is provided with a horizontal air channel, makes to add hot charging Put, the effect of refrigerating plant and fan can be embodied in whole container uniformly;Simultaneously in order to accurate Pressure before and after inflating in solving standard set-up and temperature, post pressure transducer P2 and pass with temperature in volumetric standard Sensor T2.
In order to accurately understand the atmospheric pressure outside standard set-up and temperature, equipped with pressure sensing in external environment condition Device P1 and temperature sensor T1.
Preferably, equipped with the first switch valve between described tested sonic nozzle and flow transducer, pass with flow Sensor carrys out the tested sonic nozzle of rough measure and passes through flow, controls heater and refrigerating plant as reference, So as to quickly realize the control of temperature.
For the beginning and ending time of control verification process, the first switch valve pipeline that is connected with described controller is provided with Photoimpact signal converter.
In order to use controller to speed up to the temperature stabilization of verification process, described controller is connected with heater And refrigerating plant.Preferably, described heater and refrigerating plant stretch in volumetric standard in air channel, air channel Use stainless steel.
In order to realize the vacuum state of standard set-up before air inlet, described vacuum pump is connected to by a switch valve One end of volumetric standard.
Concrete technical scheme the most of the present utility model is to include volumetric standard, controller, heater, system Device for cooling, electric fan and vacuum pump;The horizontal air channel from front end to rear end, quilt it is provided with inside volumetric standard Inspection sonic nozzle is connected to the front end in horizontal air channel through flow transducer, and the rear end in horizontal air channel is provided with electronic wind Fan, volumetric standard connects vacuum pump, heater and refrigerating plant, heater and refrigerating plant upper end All it extend in horizontal air channel, flow transducer, heater, refrigerating plant, electric fan and vacuum pump It is all connected to controller.
This utility model utilizes the air in electric fan stirring volumetric standard so that it is temperature can faster be stablized, Pilot controller realizes temperature control.
The first switch valve, the first switch valve side it is provided with between described tested sonic nozzle and flow transducer Being provided with the photoimpact signal converter of the first switch valve, photoimpact signal converter is connected to control Device.
Second switch valve it is provided with between described volumetric standard and vacuum pump.
Being provided with pressure transducer P1 and temperature sensor T1 in external environment condition, described volumetric standard inwall posts Pressure transducer P2 and temperature sensor T2.
The fan of described electric fan is placed in the rear end in the horizontal air channel of volumetric standard.
During detection, first pass through flow transducer by the flow of tested sonic nozzle, according to flow transducer Output, controller controls heating (or refrigerating plant) and heats (or refrigeration) to volumetric standard, the most in addition The agitating function of electric fan so that the temperature field of volumetric standard quickly settles out, and is greatly shortened calibrating Cycle, solve existing pVTt method gas flow meter remain temperature field stably time-consuming this problem longer.
Compared with prior art, this utility model has the advantage that
This utility model is by flow transducer, heater, refrigerating plant, controller and electric fan etc. Between coordinate and control, it is possible to the temperature field quickly realizing volumetric standard is stable, has both maintained pVTt subtraction unit Measurement accuracy, makes again the calibrating time be greatly shortened, and this equipment mechanism advantages of simple is effective.
Accompanying drawing explanation
Fig. 1 is this utility model schematic diagram of device.
In figure: tested sonic nozzle the 1, first switch valve 2, photoimpact signal converter 3, flow sensing Device 4, heater 5, refrigerating plant 6, controller 7, vacuum pump 8, second switch valve 9, electric fan 10, volumetric standard 11.
Detailed description of the invention
Below in conjunction with the accompanying drawings and this utility model is described in further detail by specific embodiment.
As it is shown in figure 1, this utility model includes volumetric standard 11, controller 7, heater 5, refrigeration dress Put 6, electric fan 10 and vacuum pump 8;Volumetric standard 11 is internal is provided with the horizontal air channel from front end to rear end, Tested sonic nozzle 1 is connected to the front end in horizontal air channel through flow transducer 4, and the rear end of volumetric standard 11 sets Having electric fan 10, its electric fan is placed in the rear end in the horizontal air channel of volumetric standard 11.Volumetric standard 11 Connecting has vacuum pump 8, heater 5 and refrigerating plant 6, heater 5 and refrigerating plant 6 upper end all to stretch Enter in horizontal air channel, flow transducer 4, heater 5, refrigerating plant 6, electric fan 10 and vacuum Pump 8 is all connected to controller 7.
Flow transducer 4 of the present utility model realizes temperature for controller 7 and controls to make reference;Heater 5 It is that controller 7 realizes temperature controlled means with refrigerating plant 6;Electric fan 10 is used for stirring volumetric standard Air in 11 so that it is be uniformly distributed, assisted heating device 5 and refrigerating plant 6 realize temperature control;Very Empty pump 8 is used for volumetric standard 11 evacuation.
Being provided with the first switch valve 2 between tested sonic nozzle 1 and flow transducer 4, volumetric standard 11 is with true Being provided with second switch valve 9 between empty pump 8, the first switch valve 2 side is provided with the photoelectricity of the first switch valve 2 Pulse signal transducer 3, photoimpact signal converter 3 is connected to controller 7.
Being provided with pressure transducer P1 and temperature sensor T1 in external environment condition, volumetric standard 11 inwall posts pressure Force transducer P2 and temperature sensor T2, pressure transducer P1, temperature sensor T1, pressure transducer P2 It is all connected to controller with temperature sensor T2.
The concrete operation principle of this utility model is specific as follows:
Before calibrating starts, choose volumetric standard 11 according to uninterrupted, open second switch valve 9, use Vacuum pump 8, by volumetric standard 11 evacuation, closes second switch valve 9.According to flow transducer 4 transmission The flow signal of tested sonic nozzle 1 and P2 and T2 recording volumetric standard 11 when recording vacuum, controller 7 will utilize heater 5 (or refrigerating plant 6) adjustment criteria container 11 in temperature stabilize it, with Shi Qidong electric fan 10 stirring is accelerated it and is stablized, and in treating volumetric standard 11, gas temperature is stably measured afterwards P2 and T2 of gas in volumetric standard 11.
First switch valve 2 is changed to centre position, when starting timer.Open the first switch valve 2, air By sonic nozzle the 1, first switch valve 2, flow transducer 4, air continues to flow into mark with constant flow In quasi-container 11.After treating that volumetric standard is full of, the first switch valve 2 is changed to centre position, stop timing Device timing.Reuse controller 7 simultaneously and utilize heater 5 (or refrigerating plant 6) adjustment criteria container In 11, temperature stabilizes it, and start electric fan 10 stirring acceleration it is stable simultaneously, treats volumetric standard In 11 gas temperature stably after P2 and T2 of gas in measurement standard container 11.Simultaneously according in external rings Equipped with pressure transducer P1 and temperature sensor T1 in border.The theory by tested sonic nozzle 1 can be recorded The actual mass flow that mass flow obtains with calibrating compares, thus calibrates tested sonic nozzle, Detection.
Finally illustrating, the content that above-described embodiment illustrates should be understood to that these embodiments are only in becoming apparent from Ground illustrates this utility model rather than is used for limiting scope of the present utility model, is reading this utility model Afterwards, those skilled in the art's amendment to the various equivalent form of values of the present utility model, new without departing from this practicality The objective of type technical scheme and scope, it all should be contained in the middle of right of the present utility model.

Claims (5)

1. a rapid verification pVTt method gas flow standard device, it is characterised in that: include volumetric standard (11), controller (7), heater (5), refrigerating plant (6), electric fan (10) and true Empty pump (8);Volumetric standard (11) is internal is provided with the horizontal air channel from front end to rear end, tested sonic nozzle (1) be connected to the front end in horizontal air channel through flow transducer (4), the rear end in horizontal air channel is provided with electronic wind Fan (10), volumetric standard (11) connects vacuum pump (8), heater (5) and refrigerating plant (6), Heater (5) and refrigerating plant (6) upper end all extend in horizontal air channel, flow transducer (4), Heater (5), refrigerating plant (6), electric fan (10) and vacuum pump (8) are all connected to control Device (7).
A kind of rapid verification pVTt method gas flow standard device the most according to claim 1, it is special Levy and be: between described tested sonic nozzle (1) and flow transducer (4), be provided with the first switch valve (2), First switch valve (2) side is provided with the photoimpact signal converter (3) of the first switch valve (2), Photoimpact signal converter (3) is connected to controller (7).
A kind of rapid verification pVTt method gas flow standard device the most according to claim 1, it is special Levy and be: between described volumetric standard (11) and vacuum pump (8), be provided with second switch valve (9).
A kind of rapid verification pVTt method gas flow standard device the most according to claim 1, it is special Levy and be: external environment condition is provided with pressure transducer (P1) and temperature sensor (T1), described standard Container (11) inwall posts pressure transducer (P2) and temperature sensor (T2), pressure transducer (P1), Temperature sensor (T1), pressure transducer (P2) are all connected to controller (7) with temperature sensor (T2).
A kind of rapid verification pVTt method gas flow standard device the most according to claim 1, it is special Levy and be: the fan of described electric fan (10) is placed in the rear end in volumetric standard (11) laterally air channel.
CN201620366638.1U 2016-04-27 2016-04-27 Examine and determine pVTt method gas flow standard device fast Active CN205580574U (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105928592A (en) * 2016-04-27 2016-09-07 中国计量大学 Rapid detection pVTt methodgas flow standard device and detection method
CN106769733A (en) * 2017-01-10 2017-05-31 中国计量大学 Focusing ultrasonic wave formula river load concentration on-line measurement instrument

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105928592A (en) * 2016-04-27 2016-09-07 中国计量大学 Rapid detection pVTt methodgas flow standard device and detection method
CN106769733A (en) * 2017-01-10 2017-05-31 中国计量大学 Focusing ultrasonic wave formula river load concentration on-line measurement instrument

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