CN109211367A - A kind of pVTt method gas flow standard device - Google Patents
A kind of pVTt method gas flow standard device Download PDFInfo
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- CN109211367A CN109211367A CN201811141449.4A CN201811141449A CN109211367A CN 109211367 A CN109211367 A CN 109211367A CN 201811141449 A CN201811141449 A CN 201811141449A CN 109211367 A CN109211367 A CN 109211367A
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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
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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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
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/17—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using calibrated reservoirs
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Abstract
The invention discloses a kind of pVTt method gas flow standard devices, including volumetric standard group system, using overall skid-mounted structure, tong-test ammeter system；Flow control system dynamical system；Control system；Pipe-line system, the pump drainage feed channel including checklist pipeline, tested pipeline manifold trunk, standard scale pipeline manifold trunk, vacuum pump and exhaust fan.Beneficial effects of the present invention: it is big with detection range, accuracy is high, have two kinds of detecting states of positive pressure and negative pressure, improve efficiency, and can be to velocity of sound mouth and the high-grade standard scale amount of progress biography.
Description
Technical field
Flow standard technical field of the present invention more particularly to a kind of pVTt method gas flow standard device.
Background technique
For the detection work for effectively carrying out Gas Energy Source instrument, the construction of China's gas flow standard device enters high speed
Period of expansion, but due to the otherness of manufacturing enterprise's technical level, cause standard set-up quality very different, while standard is sent
Inspection problem also becomes increasingly conspicuous.In conjunction with China's gas flow instrument magnitude tracing status and it can satisfy multiple industries to gas stream
Amount standard set-up effectively quickly carry out tracing to the source demand situation under, develop that range of flow is wide, accuracy is high, there is positive pressure and negative pressure
Two kinds of detection operating conditions, and can have very much to sonic nozzle and the pVTt method gas flow standard device of the high-grade standard scale amount of progress biography
It is necessary.
China possesses the unit of pVTt method gas flow standard device its device and works under normal pressure and micro-positive pressure at present,
Calibrating maximum flow only reaches 1300m3/ h, has been unable to meet actual demand.And 0.2 grade of High-precision standard gas flowmeter is wide
It is general to set for gas standard, but lack science legal standard set-up offer effectively traces to the source.
Summary of the invention
The purpose of this section is to summarize some aspects of the embodiment of the present invention and briefly introduce some preferable implementations
Example.It may do a little simplified or be omitted to avoid our department is made in this section and the description of the application and the title of the invention
Point, the purpose of abstract of description and denomination of invention it is fuzzy, and this simplification or omit and cannot be used for limiting the scope of the invention.
In view of above-mentioned existing problem, the present invention is proposed.
Therefore, it is an object of the present invention to provide a kind of pVTt method gas flow standard device, accuracy is better than 0.1% positive pressure
PVTt method gas flow standard device, and can be achieved at the same time calibration sonic nozzle under positive pressure and normal pressure, and can be to 0.2 grade
Calibrating gas flowmeter demarcated.
In order to solve the above technical problems, the invention provides the following technical scheme: a kind of pVTt method gas flow standard device,
Including volumetric standard, the volumetric standard is volume 34m3And it is configured using overall skid-mounted structure setting on verification table position
The constant guarantee component of temperature；Tong-test ammeter system is set on mobile microscope carrier and connect with the volumetric standard；Air supply system is
The volumetric standard and the tong-test ammeter system provide individual gas sources, further include positive pressure gas source and negative pressure gas source, are respectively used to just
The operation pressed and vacuumized；Pipe-line system, for connect the volumetric standard, the tong-test ammeter system and the air supply system it
Between flow path each pipeline composition, and the positive pressure gas source and the negative pressure gas source share a set of pipe-line system.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the verification table
34m is for being placed in position3Volumetric standard platform position, corresponding carrying installation 34m3The volumetric standard, and 34m3Volumetric standard is matched
The constant guarantee component of the temperature set is set in constant temperature using water-jacket.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the tong-test ammeter system
System further includes tested nozzle and standard scale, using the mounting means of pipeline connection, each pipeline between the two and the pipe-line system
It is respectively provided with measuring instrumentss；According to the principle of mass conservation, through the mass flow of standard scale compared with the indicating value of checklist, quilt is completed
Examine the detection of table.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the pipeline system
System includes main line and manifold trunk branch；The main line is triangular for the tong-test ammeter system, volumetric standard, air supply system
Connection；The manifold trunk branch is several branch lines on the main line, by the air pressure flow path branch of the air supply system.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the negative pressure gas
When source is the gas source of the volumetric standard, device detection of negative pressure state comprising water ring vacuum pump and sliding vane rotary vacuum pump；It is described just
Pressurized air source be the volumetric standard gas source when, device be positive pressure detecting state, and the positive pressure gas source include air compressor,
The high pressure tank of cooler, drying machine and different pressures.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: further include flow
Regulating system and control system；The flow control system and the volumetric standard are and described by the corresponding connection of pipeline
Flow control system includes the continuously adjustable critical flow generating apparatus of flow, using the skill of continuous control critical flow nozzle flow
Art；The control system uses two-stage separate test and control system, is capable of carrying out automatically controlling, data acquisition, counting for complete paired systems
According to processing, report management and record printing.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the flow tune
Section system further includes valve control assembly, under automatic Verification state, switch can be selected corresponding by the control system
Valve, and the switch of valve is guaranteed in place by limit switch, and valve control mode is pneumatic, electronic or surge.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the control system
System includes host computer, slave computer, data acquisition and actuator；The host computer can human-computer interaction interface set temperature value,
Flow value, control device operation and stopping, and the host computer passes through Ethernet protocol and realizes the data between the slave computer
Reception, send, can be generated according to institute's measured data to the probation redport of tested flowmeter；The slave computer includes programmable control
Device PLC, A/D module and D/A module processed, the A/D module are defeated by temperature sensor, humidity sensor, pressure sensor, flowmeter
Analog signal out is converted into digital data transmission to programmable controller PLC, realizes the acquisition of data；The D/A module will count
Word signal is converted into analog control signal output, realizes the control to the actuator.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the data are adopted
Collection includes temperature sensor, humidity sensor, pressure sensor, proving flowmeter and tested flowmeter, and above-mentioned output signal is equal
For analog signal；And the temperature sensor uses Pt100A grade platinum resistance, 0~50 DEG C, MPEV≤0.1 DEG C, scale division value is little
In 0.01 DEG C；The pressure sensor uses 0.025 stage pressure transmitter；The humidity sensor uses digital display thermometer, surveys
Measure range: 10%~99%RH, allowable error ± 2%RH.
A kind of preferred embodiment as pVTt method gas flow standard device of the present invention, in which: the actuator
It is corresponding with the valve control assembly, it further include pneumatic control valve door, frequency converter, power controller and temperature and humidity adjustment
Device；The signal that the frequency converter is exported by receiving PLC, controls the revolving speed of blower, the pneumatic control valve door passes through reception
Current analog signal adjusts aperture, and the two collective effect realizes the control to flow, the power controller and the temperature and humidity
For adjuster by receiving standard analog signal, gas temperature and the environment temperature control for controlling outflow heat exchanger respectively are indoor
Temperature.
Beneficial effects of the present invention: the range of nozzle can be examined by expanding, big with detection range, accuracy is high, with positive pressure
It with two kinds of detecting states of negative pressure, improves efficiency, and velocity of sound mouth and the high-grade standard scale amount of progress biography can both be examined and determine (calibration)
Critical flow venturi nozzle standard can also examine and determine (calibration) high-precision gas flowmeter (such as gas roots flowmeter, Ke Liao
Sharp mass flowmenter, gas turbine meter etc.).
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without any creative labor, it can also be obtained according to these attached drawings other
Attached drawing.Wherein:
Fig. 1 is 34m shown in the first embodiment of the invention3The theory structure schematic diagram of volumetric standard；
Fig. 2 is 34m shown in the first embodiment of the invention3The air supply system theory structure schematic diagram of volumetric standard；
Fig. 3 is 34m shown in the first embodiment of the invention3The whole theory structure applied to air supply system of volumetric standard
Schematic diagram；
Fig. 4 is the enlarged diagram of A module in Fig. 3；
Fig. 5 is the enlarged diagram of B module in Fig. 3；
Fig. 6 is the enlarged diagram of C module in Fig. 3；
Fig. 7 is the enlarged diagram of D-module in Fig. 3；
Fig. 8 is 34m shown in second of embodiment of the invention3、3m3And 0.1m3It constitutes volumetric standard group and is applied to air supply system
Whole theory structure schematic diagram；
Fig. 9 is the enlarged diagram of E module in Fig. 8；
Figure 10 is the enlarged diagram of F module in Fig. 8；
Figure 11 is control system architecture schematic diagram in second of embodiment of the invention；
Figure 12 is the flowage structure schematic diagram that control system is realized in second of embodiment of the invention；
Figure 13 is the overall structure diagram of adjustable opening pneumatic operated valve described in the third embodiment of the invention；
Figure 14 is the overall structure diagram of the 4th kind of safty shield of the invention；
Figure 15 is the 4th kind of safty shield perspective view overall structure diagram of the invention；
Figure 16 is the visual angle overall structure diagram of the 4th kind of safty shield isometric bottom side of the invention；
Figure 17 is the 4th kind of safty shield schematic cross-sectional view of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, right with reference to the accompanying drawings of the specification
A specific embodiment of the invention is described in detail, it is clear that and described embodiment is a part of the embodiments of the present invention, and
It is not all of embodiment.Based on the embodiments of the present invention, ordinary people in the field is without making creative work
Every other embodiment obtained, all should belong to the range of protection of the invention.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by the specific embodiments disclosed below.
Secondly, " one embodiment " or " embodiment " referred to herein, which refers to, may be included at least one realization side of the invention
A particular feature, structure, or characteristic in formula." in one embodiment " that different places occur in the present specification not refers both to
The same embodiment, nor the individual or selective embodiment mutually exclusive with other embodiments.
Thirdly, combination schematic diagram of the present invention is described in detail, when describing the embodiments of the present invention, for purposes of illustration only,
Indicate that the sectional view of device architecture can disobey general proportion and make partial enlargement, and the schematic diagram is example, herein not
The scope of protection of the invention should be limited.In addition, the three-dimensional space of length, width and depth should be included in actual fabrication.
Simultaneously in the description of the present invention, it should be noted that the orientation of the instructions such as " upper and lower, inner and outer " in term
Or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
It is not considered as limiting the invention.In addition, term " first, second or third " is used for description purposes only, and cannot understand
For indication or suggestion relative importance.
In the present invention unless otherwise clearly defined and limited, term " installation is connected, connection " shall be understood in a broad sense, example
Such as: may be a fixed connection, be detachably connected or integral type connection；It equally can be mechanical connection, be electrically connected or be directly connected to,
Can also indirectly connected through an intermediary, the connection being also possible to inside two elements.For the ordinary skill people of this field
For member, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment 1
A kind of pVTt method gas flow standard device provided in the present embodiment, can be under two kinds of positive pressure, negative pressure operating conditions
It uses, shares a set of pipeline, data acquisition, transmission, processing and control systems, detection work can be carried out independently or simultaneously, and
It can be to high-precision gas flowmeter (such as 0.2 grade of gas roots flowmeter, coriolis mass flowmeters, gas-turbine flow
Meter etc.) calibrating (calibration).The device includes volumetric standard 100, tong-test ammeter system 200, flow control system, air supply system 300, control
System and pipe-line system 400 processed.Specifically, above-mentioned each component carries out open loop or closed loop connection by pipe-line system 400, formed
Pipe path, wherein volumetric standard 100 uses existing overall skid-mounted structure, and skid-mounted structure refers to functional unit collection
It, can be with a kind of integration mode of integral installation, movement on Cheng Yuyi unsplit bedplate；So-called skid is the movement, just by equipment
Position is just convenient to carry out using crowbar, the verification table position including installation corresponding with volumetric standard 100 and the configuration of volumetric standard 100
Temperature constant guarantee component 101 is set in constant temperature in the present embodiment using the water-jacket of the prior art, and volumetric standard 100 is used for
The temperature of surrounding controls.
As shown in Figures 1 to 3,34m involved in the present embodiment3Illustrate the gas flow standard for volumetric standard pVTt-101
The principle and process of device.Specifically, the device further includes being set to 34m in the present embodiment3The upstream volumetric standard pVTt-101
Tong-test ammeter system 200, by pipe-line system 400 respectively with 34m3The gas source that volumetric standard pVTt-101, tong-test ammeter system 200 connect
System 400, and the control system integrally controlled for device.Further, in referring to Fig.1,34m3Volumetric standard pVTt-
101 using overall skid-mounted structure settings on verification table position, and be configured with the constant guarantee component 101 of temperature, the constant guarantor of the temperature
Barrier component 101 uses existing water-jacket thermostat, follows including being set to the water above volumetric standard pVTt-101
Ring hopper, collet is in 34m3The water circulation stream and frequency converter SV-101, Yi Jiyong of volumetric standard pVTt-101 wall surface
Pump PU-101 in Water circulation hydrodynamics source.Tong-test ammeter system 200 is set on mobile pallet, which is to deposit in existing
Packaged type microscope carrier, tong-test ammeter system 200 includes checklist, telescoping tube TPS1 and adjustable flow spray in the present embodiment
Mouth FCN-101.Pipe-line system 400 includes main line 401 and manifold trunk branch 402, and main line 401 is for tong-test ammeter system 200, mark
Quasi- container 100, the triangular connection of air supply system 300；Manifold trunk branch 402 is several branch lines on main line 401, will
The air pressure flow path branch of air supply system 300, for the pipeline pressure of each branch path, in order to preferably go to understand the present invention,
To be illustrated as in main line 401 with the part of gas source piping connection in figure first branch b1, second branch b2 and
Third branch a is disposed with muffler, starting pneumatic operated valve AV-101, telescoping tube TPS1, spray by the most upstream of first branch b1
Mouth, triple valve 3WV-101,34m3Volumetric standard pVTt-101, adjustable opening valve LDV-101 and pipe end pneumatic operated valve LCV-101,
And corresponding measuring device is set in the present embodiment, including be arranged between telescoping tube TPS1 and nozzle temperature sensor TT101,
Pressure sensor PT101 and temperature value display instrument TY101, pressure value display instrument PY101, are acquired by the sensor
The numerical value of corresponding detection is shown after measurement data in temperature value, pressure value display instrument.Wherein pressure sensor PT101 is existing
The sensor of some PTX5072 models；The present embodiment further includes for measuring 34m3Volumetric standard pVTt-101 temperature and pressure
Temperature sensor TT102, pressure sensor PT102 and be used for temperature controlled water circulation pipe SV101, and be located at herein
Temperature sensor TT102 is connect with data-interface EIU102A, and data-interface EIU102A can be connect with serial server, to adopting
The data of collection are shared and are analyzed；It further include temperature sensor TT601, the temperature value for measuring water circulation hopper temperature
Display instrument TY601.After the completion of the connection of above-mentioned positional relationship, first branch b1, second branch b2 are respectively and in air supply system
Negative pressure gas source 302 connects, and third branch a is located between starting pneumatic operated valve AV-101, telescoping tube TPS1, connects with positive pressure gas source 301
It connects.Working principle in the present embodiment: the switch of triple valve 3WV-101 and first branch b1 is opened first, with tong-test ammeter system 200
End is closed, by air supply system 300 to 34m3Volumetric standard pVTt-101 carries out level-one vacuum pumping, works as 34m3Volumetric standard
After temperature, pressure value display are stablized in pVTt-101, volumetric standard 100 is formally taken out using air supply system 300 again
Vacuum operation, after postponing a period of time, system carries out judging whether to test to temperature, the pressure data of acquisition, works as standard
After temperature is stablized in container 100, is carefully taken out by first branch b2, create the critical state of sonic nozzle.It should be each in the process
Valve is the operated pneumatic valve that positive pressure gas source 301 connects, and is not excluded for the possibility using electrically-controlled valve or the valve that surges certainly.
It is air supply system theory structure schematic diagram provided in this embodiment referring to Fig. 2, specifically, the air supply system 300 wraps
Positive pressure gas source 301 and negative pressure gas source 302 are included, positive pressure gas source 301 can not only be as the gas source under positive pressure calibrating state, and is also
The offer of pneumatic operated valve involved in the present embodiment opens or closes power.First positive pressure gas source 301 include be set in basement according to
Air compressor, cooler, drying machine and the hand-operated valve MV501 of secondary connection；It is set to basement upper layer and hand-operated valve MV501
Sequentially connected 5m3High pressure air storing duct VT-601,36m3High pressure air storing duct VT-602,26m3High pressure air storing duct VT-603 and heat
Exchanger, the wet temp instrument HT600 for being set to heat exchanger end, and each high pressure air storing duct all configures temperature, pressure sensing
Device, it is identical as the detection instrument of above-mentioned standard container setting, manifold trunk is also set up on the pipeline of positive pressure gas source 301 in the present embodiment
HD, the manifold trunk HD paid by different pressures section pipeline, pneumatic operated valve are connect by pipeline with manifold trunk HD, realize pneumatic operated valve
It opens and closes, wherein the pipeline of positive pressure gas source 301 is located at 26m3The high pressure upstream end air storing duct VT-603 is arranged by there is flow tune
Save valve CV-101, CV-102, flow is adjusted by the aperture of regulating valve, and with flow control valve CV-101, CV-
102 and corresponding line temperature, pressure sensor connection controller PIC501, PIC502, for temperature in control piper and
Pressure parameter.Further, negative pressure gas source 302 includes that the liquid-ring type connecting with above-mentioned first branch b1, second branch b2 is taken out very
Sky pump VP-101, dry-type vacuum pumping are pumped VP-102, and are equally controlled using pneumatic operated valve, hand-operated valve between pipeline, on pipeline
Pressure sensor PT504 is set and carries out loine pressure detection.It vacuumizes operation and is divided into two-stage, use liquid-ring type vacuum pumping pump first
Progress slightly vacuumizes operation, then carries out second level using dry-type vacuum pumping pump and vacuumizes operation.After the completion, start to be tested
Preparation.
It is 34m in reference Fig. 33Volumetric standard platform position is applied to tong-test ammeter system 200, air supply system 300 and passes through pipeline
The whole theory structure schematic diagram that system 400 connects, 34m3It is shared under volumetric standard either positive pressure, negative pressure calibrating state a set of
Pipe-line system 400 and air supply system 300, and the switching power of pneumatic operated valve in pipeline is provided by positive pressure gas source 301, in order to become apparent from
Expression and convenient for those skilled in the art understand, be classified as tetra- parts A, B, C, D, and referring to shown in Fig. 4~6 be respectively
This tetrameric enlarged diagram.
Embodiment 2
In order to improve the efficiency of detection and adapt to the detection of different size in the present embodiment, in the present embodiment with first
In a embodiment the difference is that: further include verification table position specification be respectively specifically 0.1m3Volumetric standard platform position, 3m3Standard is held
Device platform position and 34m3Volumetric standard platform position；Respectively correspond 0.1m3、3m3And 34m3The standard of volumetric standard, different size is held
Device 100 constitutes volumetric standard group, wherein 3m3、34m3Volumetric standard uses water-jacket thermostat, 0.1m3Volumetric standard uses
Water-bath type thermostat, three can simultaneously or independently carry out detection operation.Referring in Fig. 8~10, wherein Fig. 9,10 be E in Fig. 8,
The enlarged diagram of F module, wherein E is 3m3Volumetric standard, F 0.1m3Volumetric standard and 34m3Volumetric standard platform position is set side by side
It sets and shares a set of tested instrument testing equipment.Specifically, standard of the volumetric standard 100 using existing different volumes specification
Container, to meet in the short time stabilization of temperature and uniformly, wherein 34m3And 3m3Volumetric standard is designed using water-jacket, and is
Its mating is arranged is computed the sink and water circulation pipe of volume, preferably, by 34m in the present embodiment3And 3m3Volumetric standard
Water leg be divided into six and four separate chambers respectively according to calculated result, the water inlet line of each separate chamber configures
The assembled unit of vortex-shedding meter and valve monitors and adjusts the flow of inlet water of each chamber in real time, utmostly improves collet
Interior water quantity of circulating water homogenization, it is ensured that temperature collaborative in stabilization process in volumetric standard, and finally ensure in volumetric standard
The stable homogenization of temperature, for the water flow of each waters collet by being specifically designed, target is by gas temperature in volumetric standard
The stabilization time control within 90min, 0.1m3Volumetric standard is designed using water-bath type, is placed in specially designed water bath
It is interior.
It further, further include being set to the tong-test ammeter system 200 of volumetric standard group upstream in the present embodiment, and each tong-test ammeter
System 200 is correspondingly connected with the volumetric standard of a specification, so that each tong-test ammeter system 200 can carry out detection independently or simultaneously
Work, and tong-test ammeter system 200 further includes tested nozzle and standard scale, and duct type installation side is used between the two and pipe-line system 400
Formula, and measuring instrumentss are respectively provided at each pipeline and the volumetric standard of each specification, middle measuring instrumentss include temperature in this implementation
Sensor, humidity sensor, pressure sensor, temperature sensor use Pt100A grade platinum resistance, 0~50 DEG C, MPEV≤0.1
DEG C, scale division value is not more than 0.01 DEG C；The pressure sensor uses 0.025 stage pressure transmitter；Humidity sensor uses digital display
Thermometer, measurement range: 10%~99%RH, allowable error ± 2%RH.Uncertainty is selected in pressure measurement in volumetric standard
For the transmitter of 0.01% (0~700) kPa abs, it is 0.04%, (- 30~700) that uncertainty is selected in pipeline pressure measurement
The transmitter of kPaG；The transmitter that atmospheric pressure measurement need to be 0.02%, (75~125) kPa abs with uncertainty.Similarly
The accuracy that temperature measures in each volumetric standard 100 is most important, and existing middle benchmark container (is equivalent to the present embodiment Plays
Container) clinical practice is uniformly distributed temperature measuring point, recommends to select OKAZAKI high-precision four-wire system platinum resistance, both ends are respectively drawn two and led
Line, wherein two are used as constant current input signal cable, to provide constant 1mA reference current, in addition two signal wires are used to survey
Its voltage value is measured, measurement circuit independently separates, and due to being isolated using input, output, power supply three, substantially reduces lead resistance
The error of resistance value is measured to it, accuracy is 0.05 DEG C, range is 0~50 DEG C, meanwhile, temperature probe diameter is less than 3.5mm,
Thermal resistance, the variation of the rapid reaction temperature of energy can be effectively reduced.
Due to answering multiple spot science to be distributed temperature measuring point, 34m in volumetric standard 1003Volumetric standard, every cubic metre no less than
1 temperature measuring point, sum are no less than 40 temperature measuring points, 3m3When volumetric standard, temperature measuring point is no less than 8,0.1m3Volumetric standard is surveyed
Warm spot is no less than 4, with reduce due in volumetric standard gas temperature it is uneven caused by uncertainty of measurement, standard appearance
It is the transmitter of 0.01% (0~700) kPa abs that uncertainty is selected in pressure measurement in device 100, and pipeline pressure measurement is selected
Uncertainty is the transmitter of 0.04%, (- 30~700) kPaG；Atmospheric pressure measurement need to be 0.02%, (75 with uncertainty
~125) transmitter of kPa abs.
Itd is proposed in the present embodiment the volumetric standards 100 of above-mentioned 3 different sizes by after pipe-line system connection side by side just
A set of tested instrument test pipeline is shared under pressure and two kinds of operating conditions of negative pressure, share a sets of data acquire share sets of data acquisition,
There is independent gas source to pass through standard set-up mass flow and quilt according to the principle of mass conservation for transmission, processing and control systems
The indicating value of inspection table compares, and completes the detection of checklist, can carry out detection work independently or simultaneously.It should in certain the present embodiment
It further include control system, and for the flow control system of piping flow control.Practical specific flow control system is upper
Each valve control assembly (i.e. pneumatic operated valve) in one embodiment is stated, is correspondingly connected between each volumetric standard and pipeline, and
Flow control system further includes the critical flow generating apparatus for having flow continuously adjustable, using continuous control critical flow nozzle flow
Technology.Valve control assembly can select switch respective valves under automatic Verification state, through control system, and pass through limit
Bit switch guarantees the switch of valve in place, and valve control mode is pneumatic, electronic or surges, it is clear that, in the present embodiment
The control mode of pipeline valve is that the valve that Pneumatic opening & closing mode is connected with volumetric standard 100 uses pneumatic cut-off and pneumatically opens
Close the double valve combination of ball valve, it is ensured that the gas zero leakage under high vacuum trystate and high-potting state, and mark
Quasi- container 100 be connected triple valve be package unit uncertainty level principal element, which is simultaneously obtained using Japanese import
The product of patent, triple valve commutating period meet Δ t≤1 × 10-4, reach requirement of ignoring；Design is swashed using high-precision
Optical sensor measures record to triple valve commutating period, and according to the actual observation record of triple valve commutating period, triple valve is theoretical
It designs commutating period error and is less than 1ms.Pipeline control is realized with this.It is not difficult to find that it certainly should also be when included in the present embodiment
Between measuring unit, use the prior art, the timing of time measuring unit should be accurate and reliable, cause time uncertainty of measurement
There are two types of factors: first is that the stability of crystal oscillation frequency；Second is that A class uncertainty when timer, using existing crystal oscillator
Sensor, resolving power are less than 0.1ms, and the stability of crystal oscillator 8h is better than 1 × 10-6, it is U that the time, which measures Composite Seismogram,rel=
0.001% (k=2).Matched by the design of above each modular unit, the uncertainty calculation formula of device instantaneous flow is u1=
(u2 v+u2 t+u2 p+u2 T+u2 Z+u2 Δt+u2 Δm)1/2, in formula: the relative standard uncertainty u of volumetric standard volumev=0.025%；
The relative standard uncertainty u of time measurementt=0.001%；The relative standard uncertainty u of pressure measurementp=0.01%；Temperature
Spend the relative standard uncertainty u of measurementT=0.017%；The relative standard uncertainty u of gas compressibility factorZ=0.005%；
And the time system difference relative standard uncertainty u of triple valveΔt=0.01%；The relative standard uncertainty of pressure measurement
uΔm=0.005%；The instantaneous flow relative uncertainty degree u of synthesis1=0.0335%, expanded uncertainty Urel=0.067% (k
=2).
The checklist range of flow that covering device design can examine and determine under negative pressure method is (0.2~1600) m3/ h, positive pressure method
Detectable range of flow is 0.5~400m down3/ h, positive pressure method pressure are 0.6MPa abs.1m3Or more volumetric standard phase
It is U to expanded uncertaintyrel=0.07% (k=2), 1m3The opposite expanded uncertainty of following volumetric standard is Urel=
0.1% (k=2)；Room temperature control is at 15 DEG C~25 DEG C when device is run, temperature stability are as follows: ± 2 DEG C/for 24 hours, ± 0.5
℃/1h.The design of the covering device has fully considered the Proper Match of each section, stringent design, the configuration guaranteed mould of accuracy
Module unit, it is ensured that the uncertainty of package unit；Calibrating can be achieved in positive and negative platen press, and reserved suitable for the method for standard table in later period
Expansion interface and space, reach the standard for fully considering device and using, safety, and rational deployment, meet environmental protection drop
It makes an uproar the requirement improved efficiency.
Further, the realization of control system is illustrated, control system uses existing PIC or PLC in the present embodiment
Controller (programmable interrupt controller) corresponds to the PIC appended drawing reference in diagram.Further, according in existing control system
It should be noted that control system includes host computer, slave computer, data acquisition and actuator；Wherein host computer is to use
LabVIEW software programming controls the PC of program, can be in human-computer interaction interface set temperature value, flow value, control device operation
And stopping, and host computer can be given birth to by the reception, transmission of data between Ethernet protocol realization and slave computer according to institute's measured data
The probation redport of tested flowmeter in pairs；Slave computer includes programmable controller PLC, A/D module and D/A module, and A/D module will be warm
Degree sensor, humidity sensor, pressure sensor, flowmeter output analog signal be converted into digital data transmission to programmable
Controller PLC realizes the acquisition of data；Digital signal is converted analog control signal output by D/A module, realizes to actuator
Control.Data acquisition includes temperature sensor, humidity sensor, pressure sensor, proving flowmeter and tested flowmeter, defeated
Signal is analog signal out.Actuator part and above-mentioned valve control assembly adapt to comprising pneumatic control valve door, frequency converter,
Power controller and thermo hydrograph regulator, the signal that frequency converter is exported by receiving PLC, control the revolving speed of blower, pneumatic to adjust
It saves valve and adjusts aperture by receiving current analog signal, the two collective effect realizes the control to flow, power controller and temperature
Humidistat controls the gas temperature and environment temperature control room of outflow heat exchanger by receiving standard analog signal respectively
Interior temperature.
Referring to Fig.1 in 1, the present embodiment control system for example can be using the knot of centralized management, decentralised control, data sharing
Structure, Industrial Ethernet is for realizing the communication between management level and the controller of shop layer or between controller and PC, general number
According to measure larger, transmission range farther out, transmission rate it is fast, be suitable for bad environments and anti-interference demanding industry spot.This dress
It sets by using 3 existing temperature-detecting devices, respectively to 3 constant volume slots (volumetric standard of corresponding 3 different sizes
100) internal temperature is measured in real time, and data are passed to host computer, and data sharing thus may be implemented.The present apparatus is also
Using 3 pressure detecting instruments, data acquisition is carried out to the pressure in 3 constant volume slots, to realize data sharing；And it is handed in heat
In parallel operation and atmosphere, humidity measurement instrument and temperature and humidity pressure one detector real-time data collection are used respectively and is shared；3 are used simultaneously
Platform T4CU respectively analyzes data collected, to judge whether test is completed.Firstly, by this after the completion of test
Then a little data transmissions provide every detail parameters of checklist, are finally uploaded to specified data library into host computer
In.This 3 T4CU operate 3 triple valves respectively, control entire experiment process, and shared with 3 PC machine during the test
Data.Above all of data realize that the agreement used is RS-485 by one 16 mouthfuls of serial server.
Flow chart in 2 referring to Fig.1, together referring to Fig.1~10 in, the control principle based on PLC is accomplished by first order pumping
The process of vacuum is designed essentially according to the control sequence of PLC.When being vacuumized to constant volume slot (i.e. above-mentioned standard container 100), first
It is separately turned on water-ring vacuum pump, BV105 and BV102, vacuum pump is made first to open operation；After postponing a period of time, close
BV102, then BV103, LDV101 and LCV101 are opened respectively, thus start that constant volume slot is carried out to vacuumize operation.In order to ensure
Pressure inside the tank is stablized, and after constant volume slot internal pressure reaches preset requirement, also needs to wait for a period of time.When pressure reaches centainly
After it is required that, LDC101, LCV101 and BV103 are closed, opens BV102, and wait the signal of above-mentioned valve in place；Finally, stopping
Only VP101 and BV102, the first order vacuumizes work and is basically completed at this time, needs to monitor constant volume slot internal pressure；If equipment is different
Often, then termination test is wanted；Test terminates must be according to certain process, to prevent equipment damage；It to be shown at this time in host computer simultaneously
Device is in test final state；The second level vacuumize vacuumized with the first order it is quite similar, difference be to use first
Dry-type vacuum pumping pump after dry vacuum pump startup, opens BV104 and take out very to constant volume slot so the pipeline used is different
Idle job.Before carrying out formal flowmeter detection test, it is also necessary to be prepared work, prepare process be it is extremely important,
It will directly affect the success or not of flowmeter detection test, mainly be carried out by user's selection using negative pressure method or positive pressure method
Test, as long as can make as long as host computer is selected slave computer PLC to device carry out practical operation.Further, work as use
When negative pressure method, AV101 is opened, pipeline is directly contacted with atmospheric pressure at this time；When selection is using positive pressure method, AV102 is opened, it is fixed to make
Product slot is connected with air accumulator, successively carries out flowmeter detection test.The present embodiment further includes designing monitoring system using LabVIEW
Picture, wherein including 3 pipeline pictures, the process for entirely testing.Meanwhile operator can directly operate from monitoring screen
Whole system also can learn that equipment is abnormal from monitoring system picture, in time make adjustment；It is necessary to when, can be tight
It is anxious to close whole equipment.
In Fig. 1~10, appended drawing reference involved in figure is as follows: (note: LCV-201 is equal with LCV201, other similarly)
Embodiment 3
In reference above-described embodiment, adjustable opening pneumatic operated valve in pVTt method gas flow standard device of the present invention,
It is illustrated as CV101 or CV102 in figure, is used for the flow control of positive pressure pipeline, existing middle pneumatic control valve is with compressed gas
Power source, using cylinder as actuator, and by means of valve positioner, converter, solenoid valve, guarantor position valve, air accumulator, pneumatic filter
Equal attachmentes remove driving valve, can realize that switching value or proportion expression are adjusted, by way of adjusting aperture to adjust pipeline medium
: the various parameters of technique process such as flow, pressure, temperature, liquid level.It should be noted that air rammer executes in the present embodiment
Mechanism uses compressed air source, i.e., the gas source generated using air supply system 300 is passed through between pipeline and pneumatic control valve
Connection, and moved up and down by the movement of valve inner piston band ovable valve stem, reach the opening and closing for making valve.Those skilled in the art
It should be understood that in real process, first is that pneumatic control valve installation site, requires have certain height away from ground, valve
Up and down will there are certain spaces, to carry out the dismounting and repairing of valve, for be equipped with pneumatic positioner valve and handwheel adjusting
Valve, must guarantee operation, observation and it is easy to adjust；Second is that regulating valve should be mounted on horizontal pipe, and vertical with pipeline up and down, one
As to be supported under valve, guarantee it is solid and reliable；And when installing, when the bore of regulating valve and process pipe be not identical, answer
It is connected using reduced pipe, in the installation of small-bore regulating valve, can be threadedly coupled, avoid bringing bigger additional answer to regulating valve
Power, third is that by-pass line is arranged, it is therefore an objective to, can be in the case where not stopping operation to regulating valve convenient for switching or manual operation
It is overhauled.
Therefore the adjustable opening pneumatic operated valve that the present embodiment uses is as shown in figure 13, illustrates the present embodiment adjustable opening gas
The overall structure diagram of dynamic valve comprising valve 500, air rammer 600 and valve deck unit 700, the installation between three
Structure can refer in the prior art in such a way that screw thread is embedded in or is fixed using bolt.Specifically, valve 500 is a kind of pass
Closing member is the slide-valve of parallel gate plate, and closure member can be single disc or the double disc therebetween with spreading mechanism, flashboard
It to the pressing force of valve seat is controlled by acting on the pressure medium of floating flashboard or floating valve seat, if it is double disc Flat Sluice
Valve, then the spreading mechanism between two flashboards can supplement this pressing force, and flat gate valve can be divided into manual platform by driving method
Gate valve, Pneumatic flat-plate gate valve and driven plate gate valve.And the present embodiment is single valve plate, and drives valve by air rammer 600
Door 500 is turned on or off, and by this present embodiment using air pressure being the piston of power, therefore is able to use rubber material
Material because the opposite mode of surging will lead to rubber material using after a long time can aging, lead to sealing leak, there are certain
The problem of security risk.Air rammer 600 further includes cavity 601, the piston with sliding space in further the present embodiment
Ontology 602, valve rod 603 and indicating arm 604, piston only 602 are set in cavity 601 and are integral type solid construction, valve
603 upper end of bar is connect with piston only 602, and lower end is connected with the valve plate 501 being set in valve 500.It needs to illustrate
It is that piston only 602 can slide up and down in cavity 601, by injecting hydraulic or air pressure into 601 one end of cavity
Pressure in cavity 601 is caused to increase, so that it is mobile to the lesser one end of pressure to push piston only 602, otherwise similarly, and valve deck
Signal in such as figure of unit 700, the mode being fixed by bolts are installed on the both ends of valve 500.Further, in the present embodiment
In, valve 500 further includes pipeline 502, valve chamber 503 and valve seat 504；Valve chamber 503 is connected to 502 cross of pipeline, is understood that
, corresponding pipeline 502 is gas source pipe in pVTt method gas flow standard device of the present invention, and operated pneumatic valve is used for
The flow control of pipeline.Valve seat 504 is set in valve chamber 503, and valve plate 501 is set in valve seat 504 and by about 603 band of valve rod
It is dynamic, realize the opening and closing of valve seat 504, valve deck unit 700 further includes the bonnet, 701 and bottom flange for being arranged on lower end
702；Mounting portion 701a is arranged in 701 upper end of bonnet, and mounting portion 701a is inserted into lower installing port by being threadedly engaged installation, and valve
Bar 603 passes through bonnet, 701 and connect with valve plate 501；Bottom flange 702 further includes the tail-hood 702a connecting with 500 bottom end of valve, embedding
Cover the hood 702b being set in the tail-hood 702a and foot piece 702c being set in tail-hood 702a and hood 702b.It is arranged herein
The purpose of foot piece 702c is 501 stress balance of valve plate in the case where valve chamber 503 has pressure, it is ensured that in valve wide open or entirely
Off status avoids valve plate from receiving the pressure of medium and move up.
It should be noted that the mounting means up and down between piston only 602, valve rod 603 and indicating arm 604 can be adopted
With screw thread mounting means, prior art realization can refer to, while it is not difficult to visualize ability gets over personnel, valve rod 603 and indicating arm 604 are also
The telescopic rod with one can be merged into, that is, the telescopic rod merged entirely runs through the upper and lower ends of piston only 602, and both ends are stretched out
Part be valve rod 603 and indicating arm 604 in the present embodiment, and seal assembly is certainly existed in piston for sealing the gas
Piston equally can refer to prior art realization.Further, air rammer 600 further includes be set to lateral wall enterprising
Pressure mouth 605, under into pressure mouth 606 and be set to upper and lower end upper opening and lower installing port；Enterprising pressure mouth 605, under into pressure mouth
606 are separately connected pressure source, push piston only 602 to be located at by different pressure and move in cavity 601；Indicating arm 604
One end is connect with piston only 602, and the other end passes through in upper opening and realizes that sealing prevents from revealing by sealing block；Valve rod 603
One end is connect with piston only 602, and the other end is connect after passing through lower installing port with valve plate 501, similarly for valve rod 603 under
It is also that there is sealing structure identical with sealing block to be sealed in installing port.It should be noted that under mounting portion 701a insertion
By being threadedly engaged installation in installing port, screw thread mounting means is equally used, can refer to prior art realization and enterprising pressure mouth
605, it is connect into pressure mouth 606 with external pressure source under, and cavity 601 divides into epicoele and cavity of resorption, enterprising pressure by piston only 602
Mouthfuls 605 are connected to epicoeles, under into pressure mouth 606 be connected to cavity of resorption, when pressure is inconsistent in upper cavity pressure and cavity of resorption, piston can be driven
Ontology 602 is mobile to the lesser one end of pressure, therefore realizes the movement with ovable valve stem.
Embodiment 4
If the signal of Figure 14~17 is provided with upper opening 607 in the top of air rammer 600 referring in above-described embodiment,
And 604 one end of indicating arm is connect with piston only 602, the other end passes through upper opening 607 and slides up and down, and is made in piston
When industry, there can be a large amount of dust granule since upper opening 607 is exposed in air, in the air under adverse circumstances and fall
Into upper opening 607, so that the dust fallen in relative motion gap between indicating arm 604 and upper opening 607 both causes
Movement wear and increase, can have certain abrasion of particles lubricating oil is added, seriously affect the using effect of piston with
Service life.Therefore abrasion caused by dust is fallen by upper opening 607 in order to effectively reduce, the present embodiment is unlike the embodiments above
Place is: safty shield 800 is set above upper opening 607, the safty shield 800 is dust-proof for upper opening 607, and
Indicating arm 604 is exposed constantly to do stretching motion outside has certain security threat, therefore security protection to extraneous operator
Cover 800 also have for indicating arm 604 safety protection function, herein it should also be noted that, safty shield 800 with above open
Mounting means between mouth 607 realizes that those skilled in the art are it is not difficult to find that such as safty shield 800 using the prior art
Bottom setting opening inwardly and inner surface has the slot of box thread, while the extension that upper opening 607 raises upward is just right
Should be inserted into the slot with box thread, and be arranged on 607 lateral wall of upper opening between male thread and slot equipped with box thread into
Row cooperation, when safty shield 800 to be transferred in upper opening 607, can be realized installation between the two；In another example directly will
After safty shield 800 is placed in upper opening 607, bolt is set in 800 bottom surface surrounding of safty shield, is prevented safety with bolt
Connection, above-mentioned mounting means this field skill are installed between the bottom surface of shield 800 and the upper top surface of air rammer 600 to contact with each other
Art personnel combine the prior art to be fully able to realize, therefore this part of the present embodiment is not illustrated in figure.
Further, safty shield 800 further include cover 801, the linkage unit being set in cover 801 802 and
The overturning component 803 in 801 outside of cover is connect and is set to linkage unit 802, and linkage unit 802 and indicating arm 604 connect
It connecing, indicating arm 604 moves up and down with piston only 602, so that linkage unit 802 is driven to link, linkage unit
802 left-hand end and overturning component 803 are inconsistent, will overturn component 803 along with the movement of piston and contradict overturning, thus can also
It is enough in the movement travel of instruction piston.
More specifically, cover 801 is cylindrical shape, opens up on side wall and stretches out slot 801a, positioned at the upper of stretching slot 801a
Side's setting shutter 801b, shutter 801b are arranged at the longitudinal rail 801b-1 limit of 801 inner wall of cover, it is seen that
Longitudinal rail 801b-1 is the baffle of " L " type, can be located in guide rail and longitudinal sliding occurs, and the cross of shutter 801b
To width be greater than and stretch out slot 801a transverse notch width size, therefore when shutter 801b declines, can will stretch out slot 801a
The corresponding partial occlusion of notch effectively reduces dust and is entered in cover 801 by stretching slot 801a；And it is located at and stretches out slot 801a
Lower section inwardly along extended support plate 801c, be used to support linkage unit 802, which includes to extension bar
802a, lifter plate 802b, the first interlocking bar 802c, the second interlocking bar 802d and conflict idler wheel 802e, it should be noted that right
Extension bar 802a insertion 604 internal screw thread mode of indicating arm is installed, therefore is able to maintain synchronous up and down motion with indicating arm 604, should
Mounting means is with reference to the installation between safty shield 800 and upper opening 607, and those skilled in the art combine the signal of Fig. 7
It is not difficult to find that instruction can be inserted to extension bar 802a when safty shield 800 is embedded in and is rotatablely installed in upper opening 607
The rotational installation synchronized in bar 604, of course, it is possible to which the mode different by thread depth ratio setting, can be safety
Shield 800 is embedded in upper opening 607 and carries out after rotating certain distance, starts spiral shell between extension bar 802a and insertion indicating arm 604
Line cooperation is synchronous, can be achieved.Further, it is connected to the top of extension bar 802a with lifter plate 802b, to indicate
Bar 604 is able to maintain synchronous up and down motion to extension bar 802a and lifter plate 802b；First one end interlocking bar 802c passes through the
One axle bed 802c and lifter plate 802b are hinged, and one end of the other end and the second interlocking bar 802d is hinged by contradicting idler wheel 802e,
And second the other end of interlocking bar 802d pass through hinged between the second axle bed 802d-1 and support plate 801c, therefore work as indicating arm
604, extension bar 802a and lifter plate 802b are synchronized in the motion process being pressed downward, contradicts idler wheel 802e and is under pressure by stretching out
Slot 801a is stretched out and is contradicted to the inner wall of overturning component 803, and the process constantly pushed can contradict always overturning component 803 outward
Make its flip-over, when similarly moving upwards, contradicting idler wheel 802e can inwardly stretch, and overturning component 803 just not will receive outward
Conflict power.Further, overturning component 803 includes the torsional spring shaft 803a of bottom setting, it should be noted that torsional spring shaft
803a is using in the prior art with the shaft of spring torsion, in the present embodiment when contradicting idler wheel 802e and inwardly retracting, by turning round
Spring shaft 803a, which generates restoring force, makes to overturn component 803 with the trend to turn to the inside.
When under the present embodiment original state, illustrate for when valve is in the open state, when beginning, piston only 602
Above cavity 601, it should be noted that valve opening includes the two states for fully opening or not fully opening, is shown
Right, indicating arm 604 is in the distalmost end moved upwards on direction when fully opening, and it is understandable to be, when not fully opening
In half way, therefore the present embodiment, when valve fully opens, corresponding overturning component 803 is in a vertical state, and torsional spring turns
The spring of axis 803a is in the state that deformation occurs, and in order to which operator learns state at a glance, positioned at overturning component 803
Sign, such as the "ON" word that this implementation uses is arranged in lateral wall.
Further, it is moved gradually downward in piston only 602 and corresponds to valve 800 and progressively close off, while plug body 602
It moves downward and drives indicating arm 604, extension bar 802a and lifter plate 802b are moved downward, contradict idler wheel 802e at this time by under
Pressure is contradicted idler wheel 802e and is contradicted from the stretching for stretching out slot 801a to overturning group due to the hinged setting of each fulcrum of linkage unit 802
On the inner wall of part 803, it is downwardly turned over using torsional spring shaft 803a as fulcrum, the angle that overturning component 803 and cover 801 are constituted
It is continuously increased, deformation occurs for the spring in torsional spring shaft 803a, and overturning component 803 has the trend of revolution, and should work as in the process
The space that slot 801a is located above the first interlocking bar 802c is stretched out when first interlocking bar 802c declines will increase, and shutter 801b
It blocks the part that general who has surrendered stretches out that slot 801a is vacated under by gravity.Conversely, referring to when valve is by closing to unlatching demand
Show that bar 604 moves upwards, the revolution trend that overturning component 803 has is in a vertical state after fully opening.Likewise,
When first interlocking bar 802c rises, shutter 801b is contradicted, its is upward, therefore realize the rising of shutter 801b, from
And suitably reduces and fall volume dust granule in cover 801.According to above-mentioned those skilled in the art it is not difficult to find that can lead in the present embodiment
The size that the corresponding overturning component 803 of distance that indicating arm 604 rises or declines constitutes angle with cover 801 is crossed, indication valve is carried out
The degree that 800 valve plates of door are opened, for example, it is simplest after valve fully opens, and overturning component 803 is vertical, and the angle of composition is
0, and indicating arm 604 is in the distalmost end moved upwards, therefore can similarly obtain the feature of valve opening half vertically and arrive
Characteristic value when contract fully, similarly, the numerical value of the half of half it is also the same it is found that and so on, can be with user to valve
The actual needs of opening degree is calculated and carries out the instruction or rough instruction of specific value.
It should be noted that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferable
Embodiment describes the invention in detail, those skilled in the art should understand that, it can be to technology of the invention
Scheme is modified or replaced equivalently, and without departing from the spirit and scope of the technical solution of the present invention, should all be covered in this hair
In bright scope of the claims.
Claims (10)
1. a kind of pVTt method gas flow standard device, it is characterised in that: including,
Volumetric standard (100), the volumetric standard (100) are volume 34m3And using overall skid-mounted structure setting in verification table position
On, configure the constant guarantee component (101) of temperature；
Tong-test ammeter system (200) is set on mobile microscope carrier and connect with the volumetric standard (100)；
Air supply system (300), is the volumetric standard (100) and the tong-test ammeter system (200) provides individual gas sources, further includes
Positive pressure gas source (301) and negative pressure gas source (302), the operation for being respectively used to positive pressure and vacuumizing；
Pipe-line system (400), for connecting the volumetric standard (100), the tong-test ammeter system (200) and the air supply system
(300) each pipeline composition of flow path between, and the positive pressure gas source (301) and the negative pressure gas source (302) share it is a set of described in
Pipe-line system (400).
2. pVTt method gas flow standard device as described in claim 1, it is characterised in that: the verification table position is for pacifying
Put 34m3Volumetric standard platform position, corresponding carrying installation 34m3The volumetric standard (100), and 34m3Volumetric standard (100) is matched
The constant guarantee component (101) of the temperature set is set in constant temperature using water-jacket.
3. pVTt method gas flow standard device as claimed in claim 1 or 2, it is characterised in that: the tong-test ammeter system (200)
It further include tested nozzle (201) and standard scale (202), the installation being connect between the two and the pipe-line system (400) using pipeline
Mode, each pipeline are respectively provided with measuring instrumentss；According to the principle of mass conservation, pass through the mass flow of standard scale and showing for checklist
Value compares, and completes the detection of checklist.
4. pVTt method gas flow standard device as claimed in claim 3, it is characterised in that: pipe-line system (400) packet
Include main line (401) and manifold trunk branch (402)；
The main line (401) is triangular for the tong-test ammeter system (200), volumetric standard (100), air supply system (300)
Connection；The manifold trunk branch (402) is several branch lines on the main line (401), by the air supply system (300)
Air pressure flow path branch.
5. claim 1,2 or 4 it is any as described in pVTt method gas flow standard device, it is characterised in that: the negative pressure gas
Source (302) be the volumetric standard (100) gas source when, device detection of negative pressure state comprising water ring vacuum pump (302a) and
Sliding vane rotary vacuum pump (302b)；When the positive pressure gas source (301) is the gas source of the volumetric standard (100), device is positive pressure detection
State, and the positive pressure gas source (301) includes the high pressure tank of air compressor, cooler, drying machine and different pressures.
6. pVTt method gas flow standard device as claimed in claim 5, it is characterised in that: further include flow control system with
And control system；
The flow control system and the volumetric standard (100) are by the corresponding connection of pipeline, and the flow control system
Including the critical flow generating apparatus that flow is continuously adjusted, using the technology of continuous control critical flow nozzle flow；The control system
System uses two-stage separate test and control system, is capable of the carrying out automatically controlling of complete paired systems, data acquisition, data processing, report pipe
Reason and record printing.
7. pVTt method gas flow standard device as claimed in claim 6, it is characterised in that: the flow control system also wraps
Valve control assembly is included, under automatic Verification state, can select to switch corresponding valve by the control system, and
Guarantee the switch of valve in place by limit switch, and valve control mode is pneumatic, electronic or surge.
8. pVTt method gas flow standard device as claimed in claims 6 or 7, it is characterised in that: the control system includes
Host computer, slave computer, data acquisition and actuator；
The host computer control device operation and can stop in human-computer interaction interface set temperature value, flow value, and it is described on
Position machine, can be according to the generation pair of institute's measured data by the reception, transmission of data between Ethernet protocol realization and the slave computer
The probation redport of tested flowmeter；
The slave computer includes programmable controller PLC, A/D module and D/A module, and the A/D module is by temperature sensor, humidity
The analog signal that sensor, pressure sensor, flowmeter export is converted into digital data transmission to programmable controller PLC, reality
The acquisition of existing data；Digital signal is converted analog control signal output by the D/A module, realizes the control to the actuator
System.
9. pVTt method gas flow standard device as claimed in claim 8, it is characterised in that: the data acquisition includes temperature
Sensor, humidity sensor, pressure sensor, proving flowmeter and tested flowmeter, above-mentioned output signal are analog signal；
And the temperature sensor uses Pt100A grade platinum resistance, 0~50 DEG C, MPEV≤0.1 DEG C, scale division value is not more than 0.01 DEG C；Institute
Pressure sensor is stated using 0.025 stage pressure transmitter；The humidity sensor uses digital display thermometer, measurement range: 10%
~99%RH, allowable error ± 2%RH.
10. pVTt method gas flow standard device as claimed in claim 9, it is characterised in that: the actuator and the valve
Door control assembly is corresponding, further includes pneumatic control valve door, frequency converter, power controller and thermo hydrograph regulator；
The signal that the frequency converter is exported by receiving PLC, controls the revolving speed of blower, the pneumatic control valve door passes through reception
Current analog signal adjusts aperture, and the two collective effect realizes the control to flow, the power controller and the temperature and humidity
For adjuster by receiving standard analog signal, gas temperature and the environment temperature control for controlling outflow heat exchanger respectively are indoor
Temperature.
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| CN113607662A (en) * | 2021-07-27 | 2021-11-05 | 浙江省计量科学研究院 | Calibration device and calibration method for negative-pressure hydrogen peroxide detector |
| CN114001803A (en) * | 2021-09-09 | 2022-02-01 | 浙江浙能天然气运行有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
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| CN114001803B (en) * | 2021-09-09 | 2024-02-27 | 国家管网集团浙江省天然气管网有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
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