CN110131454A - A kind of Constant flow sample flow-limiting valve - Google Patents
A kind of Constant flow sample flow-limiting valve Download PDFInfo
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- CN110131454A CN110131454A CN201910488041.2A CN201910488041A CN110131454A CN 110131454 A CN110131454 A CN 110131454A CN 201910488041 A CN201910488041 A CN 201910488041A CN 110131454 A CN110131454 A CN 110131454A
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- 238000005192 partition Methods 0.000 claims abstract description 3
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- 239000010935 stainless steel Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 5
- 239000013618 particulate matter Substances 0.000 claims description 4
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 3
- 208000002925 dental caries Diseases 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 62
- 239000003570 air Substances 0.000 description 28
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 10
- 239000012855 volatile organic compound Substances 0.000 description 9
- 239000012080 ambient air Substances 0.000 description 5
- 238000002444 silanisation Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 229910052594 sapphire Inorganic materials 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
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- 238000002161 passivation Methods 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229910001374 Invar Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 244000061458 Solanum melongena Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 150000001845 chromium compounds Chemical class 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003933 environmental pollution control Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 239000011368 organic material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
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- Engineering & Computer Science (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of Constant flow sample flow-limiting valves, the Constant flow sample flow-limiting valve includes metering hole and main valve body, metering hole is connected to air inlet, main valve body includes main cover body and rear cover, there are two cavitys for setting in main cover body, one is the gas channels penetrated through, which is connected to metering hole, and the other end is provided with the sample can interface that can be connected to sample can；Another space between main lid and rear cover, interior to be equipped with flexible sheet, the flexible sheet and main cover body are in sealing contact, and there are elastic cavities between flexible sheet and gas channels wall；Rear cover is located at the outside of flexible sheet, and fixes with main cover body；Piston type nozzle is provided in gas channels, gas channels are air inlet section and air outlet section by piston type nozzle partition；It is connected between the air inlet section of gas channels and elastic cavity, elastic cavity is connected to through piston type nozzle with the air outlet section of gas channels；After cover and offer atmospheric pressure balance port.The present invention reaches real constant current current limliting by secondary current limliting.
Description
Technical field
Flow-limiting valve when the present invention relates to a kind of for sampling, in particular for the Constant flow sample for keeping sampling flow constant
Flow-limiting valve.
Background technique
With sample can (Soviet Union's code tank) the acquisition air sample vacuumized in advance, there are instantaneous sample and average sample two ways.Instantaneously
The acquisition of sample is fairly simple, and when operation need to only open sampling tank valve, using vacuum in tank that air sample is (usually small in the short time
In 10 seconds) it is drawn into sample can.The examples representative that this mode acquires opens the ambient air pollution situation of valve moment.It is flat
The acquisition of equal sample (also known as aggregate sample) wants more complex, when opening valve is sampled, need to control gas sample and enter sample can
Flow velocity makes gas enter sample can in entire sampling period with identical flow speed (constant speed).The sample that this mode acquires
Represent average pollution condition of the ambient air during entire sampling process.In the monitoring of ambient air quality, average sample
With half an hour (0.5h) when common sampling, one hour (1h), three hours (3h), eight hours (8h), one day (for 24 hours) He Yizhou
(144h).The size of sampling flow depends on sampling duration, the volume of sample can, final residual vacuum degree (pressure) etc..It is common
Sampling flow be shown in Table 1.For example, be averaged sample when the sample can for being 6 liters with volume acquires 3h, adopting to final pressure is 25inHg (absolute pressure)
When, destination sample flow should be controlled in 28.9mL/min or so.
The frequent goal sampling flow (mL/min) of 1 tank of table sampling
Note: the above flow is an atmospheric pressure (101.325kPa) and sampling final pressure is under -4inHg (86.6% tank volume)
Reference value
Volatile organic matter (VOCs) is the important presoma for causing fine particle (PM2.5) and ozone (O3) to pollute, because
This has been increasingly becoming the emphasis of National Environmental pollution control in recent years.In VOCs Evaluation of Atmospheric Environmental Quality, due to environment sky
VOCs concentration change in time and space is larger in gas, and instantaneous sampling mode has been rarely employed because being not representative, in general monitoring project all
Using 3h, 8h or average sample for 24 hours.And the representativeness of average sample, it is the stability based on sampling flow in sampling process, therefore
The accurate of sampling flow is maintained in entire sampling process and is stablized extremely important.Thus, the measurement and control of sampling flow
It is an important link in VOCs environmental monitoring.One simple and the method that effectively controls actual samples flow, to ensuring
The quality of data, the adjusting sampling flow-limiting valve etc. for acquiring average sample all have important meaning.
When actual samples, with the progress of sampling process, the gas pressure in tank can gradually rise (vacuum degree reduction), with
Pressure difference between ambient air gradually decreases, therefore gas sample flow velocity can gradually decrease, and if not being controlled, is not able to satisfy average sample
The requirement of Constant flow sample.In current environmental monitoring, there are three types of methods for the gas flow rate control of average sample acquisition:
1, it using metering hole or the valve based on metering hole (such as current limliting needle-valve), is limited using aperture into tank
Gas flow.The advantages of this method be structure is simple, belong to purely mechanic device (no electronic component) thus it is particularly stable, without dynamic
Power (power supply or battery).The disadvantage is that being limited by orifice plate principle, only when the pressure drop between external atmospheric pressure and pressure inside the tank is super
Crossing critical value could maintain flow constant.With the progress of sampling, the pressure in tank can be gradually increased, and extraneous pressure difference gradually subtracts
Few, after pressure drop is less than critical value, sampling flow declines with the rising of pressure inside the tank, is not able to satisfy in entire sampling
Flow maintains constant requirement in section.Fig. 1 illustrate the flow that is sampled when the classical current limliting needle-valve using the big network gram of U.S.'s generation with
The case where sampling pressure inside the tank increases and changes (6 liters sample for tank 3 hours).As seen from Figure 1, in sampling in preset 3 hours
In length, current limliting needle-valve can only just first 20 minutes or so maintenance flows of beginning be constant in sampling, later with sampling pressure inside the tank
Increase, sampling flow starts to reduce, and no longer meets the requirement of Constant flow sample.It will be apparent that the use of current limliting needle-valve being a kind of very rough
Sample mode, can not meet the requirement of average sample Constant flow sample in principle.
2, the gas of sample can is flowed into come active control using mass flow controller (Mass Flow Controller)
Flow velocity.The advantages of this method is not influenced by pressure inside the tank size, can control sampling flow in entirely sampling duration
It is constant.Then, at least there are three disadvantages for this method: the special sample devices based on mass flow controller (a) is needed, at
This valuableness and need periodic calibration；(b) mass flow controller generally measures the flow of gas using heat transfer diffusion principle simultaneously
It is adjusted in real time, must have power supply support in entire sampling process, this is a challenge to the inconvenient field website of power supply.Though
High capacity cell so can be used, but to prolonged sampling, such as a length of one week sample when sampling, maintain the constant need of flow
The electricity wanted is very big, and actual operation is poor；(c) many sealings use at the internal links and valve of mass flow controller
O-ring and sealing element, these components be mostly organic material, be easy absorption or release compound to VOCs sample collected
In, cause sample to pollute.
3, flow is controlled by frequently switching on for solenoid valve.The principle of the method is that solenoid valve is placed in gas circuit, is led to
The switch time of control solenoid valve is spent, to make up the reduction (CN208125450U mono- of gas flow caused by due to pressure difference decline
Kind surrounding air constant current automatic sampling apparatus).The shortcomings that this method has: (a) sampling only opens Shi Caijin in solenoid valve
Row is sampled and is off when battery valve is closed, so strictly speaking, the sample of acquisition is the fragmentary sample sampled in duration,
It is not average sample truly although distribution is relatively uniform；(b) solenoid valve maintain switch and its control element need compared with
Powerful power supply supports that this is limited the sample that is averaged for a long time, such as all samples, operability by power outlet power supply；(c)
There are lubricating oil and organic sealing material inside solenoid valve, these substances are easy absorption or release compound to VOCs collected
In sample, sample is caused to pollute.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of Constant flow sample flow-limiting valves, can be used for maintaining sampling process
In flow it is constant, the Constant flow sample flow-limiting valve utilize purely mechanic component, flow is carried out with metering hole tentatively regulate and control after, can
Secondary regulation is carried out to flow, to achieve the purpose that flow is constant.
In order to solve the above technical problems, the invention discloses a kind of Constant flow sample flow-limiting valve, the Constant flow sample flow-limiting valve packet
Metering hole and main valve body are included, the metering hole is connected to air inlet, and the main valve body includes main cover body and rear cover, setting in main cover body
There are two cavity, one is the gas channels penetrated through, which is connected to metering hole, and the other end is provided with to be connected to and adopt
The sample can interface of sample tank；Another space between main lid and rear cover, it is interior to be equipped with flexible sheet, the flexible sheet and master
Lid is in sealing contact, and there are elastic cavities between flexible sheet and gas channels wall；Rear cover is located at the outside of flexible sheet, and with
Main cover body is fixed；Wherein, metering hole is fixed in the connector of 1/4 inch of big Lip river gram of generation (or its compatible type) with cold-press method, with
Facilitate the mutual replacement between the metering hole of different pore size.It is cold-pressed the big Lip river gram connector exterior of packaged generation and stamps metering hole label,
To identify.After handling in this way, the same flow-limiting valve can be suitable for different range of flows by way of replacing metering hole
Demand.Sample can interface uses 1/4 inch pipe, the interface as sampled downstream tank.This interface, which can according to need, to be designed to
The pin end or female connector of the big Lip river gram of generation (or its compatible type) or be quick coupling type.
Be provided with piston type nozzle in the gas channels, gas channels by piston type nozzle partition be air inlet section and
Air outlet section；
It is connected between the air inlet section of the gas channels and elastic cavity, elastic cavity goes out through piston type nozzle and gas channels
Gas Duan Liantong；
It is covered after described and offers atmospheric pressure balance port.
Further, the air inlet is provided with particulate filter, and it is 1-7 that aperture is filled in the particulate filter
μm stainless steel sintered sheets filtering material, to prevent particulate matter clogging flow restriction hole in gas sample and pollution gas sample, stainless steel sintering
The aperture of filtration core is 1~7 μm, and most preferably 2 μm, suboptimum is 5 μm, then suboptimum is 7 μm.
Further, it is connected between the particulate filter and metering hole by sample introduction bend pipe.
Further, diaphragm compress gasket is additionally provided between the flexible sheet and rear cover, the diaphragm compress gasket
Push down the periphery of flexible sheet.
Further, the described screwed hole post of protrusion is additionally provided on the outside of the main cover body, piston type nozzle has a screw thread
End, the end of thread are located in the described screwed hole post, adjusting bolt are also connected in described screwed hole post, the inner end of the adjusting bolt resists work
The end of thread of plug nozzle, outer end are equipped with protection nut.
Further, holding firmware is additionally provided in the gas channels, piston type nozzle is fixed on the holding firmware.
Nozzle uses piston cylinder operator, can along described screwed hole post and holding firmware inner channel-shaped at center cavity slide.
By adjusting bolt adjusting and the distance between flexible sheet, the size of flow can be adjusted in a certain range.When adjusting finishes,
Protection nut is covered, is moved to prevent accidentally being touched.Pass through two nozzle O between piston type nozzle and gas channels and holding firmware
Type circle seals.To reduce the pollution to sample, the preferably poly- fluorine material of O-ring, such as polytetrafluoroethylene (PTFE) or Viton O-ring.
Further, it is close by diaphragm seal O-ring and main cover body to be located at elastic cavity side for the periphery of the flexible sheet
Envelope setting.
Further, the main valve body is additionally provided with pressure gauge connection, which connects main cover body, and is connected to gas
The air outlet section of paths.Vacuum pressure composite table can be installed on pressure gauge connection and be used to refer to the intracorporal pressure of tank in sampling process
Power.Pressure gauge connection can be according to beautiful and balance any position for needing to be located on main cover body, as long as being connected to gas channels
Air outlet section has no effect on its function.
Further, the component which contacts with sampled air is all made of 316 type stainless cast steel parts, institute
Flexible sheet is stated to be made of 316 soft type stainless steel thin slices.Including particulate filter, sample introduction bend pipe, metering hole, main valve body
Main cover body, piston type nozzle (or suction nozzle), stainless steel flexible sheet and sample can interface also use the stainless steel of 316 types
At.Since main component is 316 stainless steels, silanization Passivation Treatment can be carried out, meets the requirement of VOCs sampling.
Further, the centre of the flexible sheet is burnishing surface, remaining position is wavy surface.
Flow-limiting valve as sampling equipment, can the component of its is all and sample gas contact be all passivated processing, with
The accuracy for guaranteeing sampling analysis, including particulate filter, sample introduction bend pipe, metering hole, the main cover body of main valve body, piston type spray
Mouth (or suction nozzle), stainless steel flexible sheet etc., diaphragm seal O-ring then select poly- fluorine material, for example, polytetrafluoroethylene (PTFE) or
Viton O-ring.The component that directly contacts of discord gas sample, such as the rear cover of diaphragm compress gasket and main valve body, can be without
Silanization Passivation Treatment, but since silanization treatment can be covered with one layer of aubergine or depth for having metal-like to metal surface
Blue, for the aesthstic perception of entire valve, all components can be carried out silanization Passivation Treatment.But silanization is passivated
Processing only makes flow-limiting valve be suitable for the sampling of VOCs, itself has no effect on the constant current function of flow-limiting valve.
Cause influence to flow because of atmospheric temperature variation when to reduce field sampling, metering hole by thermal expansion coefficient very
Small material manufacture.Meet this condition and lower-cost material, preferably synthetic ruby (main component is corundum,
Chemical formula α-Al2O3, it is due to being wherein mixed on a small quantity containing chromium compound that red, which is presented) and synthetic sapphire (main component is rigid
Jade, chemical formula α-Al2O3, it is due to being wherein mixed with a small amount of titanium-containing compound that blue, which is presented).Secondary material selection be thermal expansion coefficient very
Small constant steel (also known as invar alloy, invar steel, perseverance Fan Gang).Metering hole has different pore sizes, adopts corresponding to different
Sample flow.Common, current limliting bore dia is from 0.02 to 0.2mm.Wherein, the aperture 0.02mm corresponds to 0.5~7mL/ of range of flow
min；0.04 aperture mm corresponds to 2~15mL/min of range of flow；The aperture 0.07mm corresponds to 5~25 mL/min of range of flow；
The aperture 0.11mm corresponds to 13~60mL/min of range of flow；The aperture 0.21mm corresponds to 50~500mL/min of range of flow.Each rank
Small aperture selection, on the one hand need to cover from the entire common sampling flow range (table 1) of 0.5~500 mL/min,
On the other hand, due to certain error that is machined in aperture, the covering range of flow of each rank aperture needs certain intersection.
In addition, because of aperture error, orifice shapes difference, (aperture is in the side vertical with hole surface for hole length in the manufacturing process of metering hole
Upward thickness) difference etc., actual flow can be with above-mentioned difference.But the principle and thinking of aperture selection are phases
Logical.
The present invention carries out the current constant control of flow by two steps: the first step is existed flow control using metering hole
In a certain range；The metering hole of different pore size corresponds to different range of flows.Second step passes through piston type nozzle and flexible sheet
Secondary Control is carried out to flow.With the progress of sampling, pressure inside the tank will be gradually increasing, and flexible sheet gradually increases under pressure
The distance between piston type nozzle (is automatically adjusted) greatly, compensates the flow reduced due to upstream and downstream pressure difference becomes smaller automatically.Pass through bullet
Property diaphragm and piston type nozzle synergistic effect, maintain the constant of sampling flow in entire sampling duration.The present invention is in current limliting
On the basis of hole, recycles the synergistic effect of flexible sheet and piston type nozzle to carry out the device of further regime flow, be to tradition
A much progress of flow control is only carried out using metering hole.
To sum up, the invention has the characteristics that: 1, purely mechanic component is supported without power supply, is suitble to field any place
Sampling.2, by replacing the metering hole of different pore size and adjusting the distance between nozzle and flexible sheet, common sampling is covered
0.5~500mL/min of tank sampling flow range.3, secondary regulation is by piston type nozzle and for pressure compensated elastic membrane
What piece carried out.The case where flexible sheet will be according to pressure inside the tank, the distance between automatic adjustment and piston type nozzle, to influence to spray
The gas flow that mouth sprays maintains sampling flow in entire sampling duration by the synergistic effect of flexible sheet and piston type nozzle
It is constant.In the uphill process that vacuum (terminates weak vacuum) from 30inHg (initial vacuum) to 3inHg in guarantee sample can, from week
The gas flow rate of side air to sample can maintains constant (do not change because of the rising of pressure inside the tank, or vary less), thus full
The sampling request of foot averagely sample.
Detailed description of the invention
Fig. 1 is using tank sampling flow when needle-valve (metering hole) with the situation of change in sampling time；
Fig. 2 is the overall structure diagram of flow-limiting valve of the present invention；
Fig. 3 is flow-limiting valve main valve body section view enlarged structure schematic diagram of the present invention；
Fig. 4 is the exploded sketch of main valve body of the present invention；
Fig. 5 is structural schematic diagram when Constant flow sample flow-limiting valve of the invention to be applied to sample can；
Fig. 6 is 3L sample can using 3h sampling flow result statistical chart after Constant flow sample flow-limiting valve of the invention.
Figure label: 1- particulate filter；1.1- protects nut cap；2- sample introduction bend pipe；3- metering hole；4- main valve body；
4.1- adjusts bolt；；4.2- main cover body；4.2.1- air inlet section；4.2.2- air outlet section；4.2.3- gas channels wall；4.3- piston
Formula nozzle；4.3.1- nozzle inlet channel；4.3.2- nozzle outlet passageway；4.3.3- nozzle O-ring；4.4- diaphragm seal is O-shaped
Circle；4.5- flexible sheet；4.5.1- burnishing surface；4.5.2- wavy surface；4.6- diaphragm compress gasket；4.6.1- gasket venthole；
4.7- rear cover；4.7.1- atmospheric pressure balance port；4.8- elastic cavity；4.9- holding firmware；4.9.1- holding firmware air flue；4.10- spiral shell
Pit column；4.11- protecting nut；5- pressure gauge connection；5.1- vacuum pressure composite table；6- sample can interface；7- sample can.
Specific embodiment
Below with reference to embodiment, present invention be described in more detail.
As shown in Fig. 2, Constant flow sample flow-limiting valve of the invention mainly includes the particulate filter being set at air inlet
1, the stainless steel sintered sheets filtering material that aperture is 1-7 μm is filled in the particulate filter 1, be with 2 μm of aperture it is best, go
Except the particle for being greater than 2 μm in gas sample, the gas sample acquired to prevent the metering hole of particulate matter clog downstream and pollution (depositing by particulate matter
VOCs can be released during storage into gaseous sample).Particulate filter 1 connects metering hole 3, current limliting by sample introduction bend pipe 2
Hole 3 is connected to main valve body 4, and main valve body 4 is as shown in Figure 3, Figure 4.Main valve body 4 includes main cover body 4.2 and covers in 4.2 side of main cover body
Rear cover 4.7, offer atmospheric pressure balance port 4.7.1 on rear cover 4.7, atmospheric pressure balance port 4.7.1 connection is internal, i.e.,
Space between rear cover 4.7 and main cover body 4.2 is provided with flexible sheet 4.5 and diaphragm compress gasket 4.6 in the space, elasticity
It is in sealing contact by diaphragm seal O-ring 4.4 and main cover body 4.2 on the inside of the periphery of diaphragm 4.5, outside diaphragm compress gasket 4.6
All insides are provided with raised line, which presses the middle part of flexible sheet 4.5 and periphery outside is then installed by corresponding positions on rear cover 4.7
The raised line and boss set resist fixation.The gasket venthole for flow of ambient air is also offered on diaphragm compress gasket 4.6
4.6.1.The centre of flexible sheet 4.5 is burnishing surface 4.5.1, remaining position is wavy surface 4.5.2.
Using the side far from rear cover 4.7 as inside, the other side is outside for flexible sheet 4.5 and diaphragm compress gasket 4.6.
Main valve body 4 is additionally provided with a cavity independently of the space between rear cover 4.7 and main cover body 4.2, for perforation
Gas channels, the gas channels one end are connected to metering hole 3, and the other end is provided with the sample can interface 6 that can be connected to sample can, and
It is provided with holding firmware 4.9 in the middle part of the gas channels, gas channels are separated for air inlet section 4.2.1 and air outlet section 4.2.2, the card
Moveable piston type nozzle 4.3 (or suction nozzle) is fixedly installed in firmware 4.9, piston type nozzle 4.3 has an end of thread,
The end of thread is threadedly coupled with described screwed hole post 1.10, and 1.10 protrusion of described screwed hole post is set to the outside of main cover body 4.2.Described screwed hole post
It is also connected in 1.10 and adjusts bolt 4.1, the inner end of the adjusting bolt 4.1 resists the end of thread of piston type nozzle 4.3, outer end
Equipped with protection nut 4.11.There are two O-rings for setting on piston type nozzle 4.3, are formed between holding firmware 4.9 and gas channels
Sealing.Gas channels are parallel to the space between rear cover 4.7 and main cover body 4.2, in gas channels wall 4.2.3 and flexible sheet
There are elastic cavity 4.8 between 4.5, which passes through the venthole and gas channels that are set on gas channels wall 4.2.3
Air inlet section 4.2.1 connection.
The nozzle inlet channel 4.3.1 of connection elastic cavity 4.8, the piston type nozzle are provided in piston type nozzle 4.3
It is additionally provided with nozzle outlet passageway 4.3.2 in 4.3, the side of holding firmware 4.9 is provided with holding firmware air flue 4.9.1, the spray
Mouth one end outlet passageway 4.3.2 is connected to inlet channel 4.3.1, and the other end is connected to holding firmware air flue 4.9.1, holding firmware air flue
4.9.1 the air outlet section 4.2.2 of other end connection gas channels.The outlet of air outlet section 4.2.2 is provided with sample can interface 6, adopts
Sample tank interface 6 is used to connect the air inlet of sample can, and sample can interface 6 is 1/4 inch pipe.
All components contacted with sampled air are all made of 316 type stainless cast steel parts, including particulate filter 1, sample introduction
Bend pipe 2, metering hole 3, main cover body 4.2, flexible sheet 4.5, piston type nozzle 4.3, holding firmware 4.9, sample can interface 6.
In order to monitor the pressure in sample can in real time, pressure gauge connection 5 is also connected on main valve body 4, which connects
Mouth 5 is located at main cover body 4.2, and is connected to the air outlet section 4.2.2 of gas channels.The flexible sheet 4.5 by 316 soft types not
Rust steel thin slice is made.
When not in use, the inlet end protection nut cap 1.1 of particulate filter 1 covers the constant current current limliting sampling valve.
Main valve body 4 uses flat disc structure, and flexible sheet 4.5, diaphragm compress gasket 4.6, rear cover 4.7 are in circle
Shape, diaphragm seal O-ring 4.4 are circular ring shape.
Sample gas is filtered through particulate filter 1, and by after sample introduction bend pipe 2, in metering hole 3 by preliminary current limliting,
The probable ranges of main limited flow rate, subsequently into flow-limiting valve main valve body 4, herein by secondary flow control, under finally flowing into
The sample can of trip.In secondary flow control, by the synergistic effect between flexible sheet 4.5 and piston type nozzle 4.3, to flow into
Row compensation keeps its constant in a fixed setting value, realizes constant current.The fixed value and piston type nozzle 4.3 of this flow with
Pre-determined distance between flexible sheet 4.5 is related, can be by adjusting 4.3 position of position control piston type nozzle for adjusting bolt 4.1.
The compensation principle of constant current is that flexible sheet 4.5 is flexible soft stainless steel metal piece, and right side is because of diaphragm compress gasket 4.6
It is connected to atmosphere, bears the pressure of an atmospheric pressure always, left side is connected to by piston type suction nozzle 4.3 and with sampling tank.Tank
Intracorporal pressure (vacuum, negative pressure), the burnishing surface in 4.5 centre of flexible sheet is transmitted to by piston type nozzle 4.3
4.5.1.Gas, which is turned left by piston type nozzle 4.3 from the right side, enters sampling tank (shown in Fig. 3), to flexible sheet 4.5
Left side generates suction, and when the vacuum in sample can is stronger, this suction is also strong, and flexible sheet 4.5 is caused to protrude more to the left, thus
The throughput for entering piston type nozzle 4.3 is reduced, self-control is played the role of.With the progress of sampling, pressure inside the tank can be by
Edge up height, and flexible sheet 4.5 is gradually retracted the right, oversize piston formula nozzle by the mechanical elastic that flexible sheet 4.5 is sprung back to the right
Distance between 4.3 and flexible sheet 4.5, to increase the suction airflow amount of piston type nozzle 4.3.It integrates, passes through current limliting
The current limliting in hole 3 and the elasticity of flexible sheet 4.5, can realize the constant current in sampling process automatically.By adjusting adjusting bolt 4.1
Position adjustment piston type nozzle 4.3 from the relative position between flexible sheet 4.5, this constant current can be adjusted in a certain range
Specific flow velocity.When piston type nozzle 4.3 is close to flexible sheet 4.5, constant current flow is reduced, conversely, when piston type nozzle 4.3 is remote
When from flexible sheet 4.5, constant current flow increases.That is, replacing upstream metering hole after a constant flow sampler preparation
The rank (range of flow) of constant current flow can be changed in 3 size, adjusts between downstream piston formula nozzle 4.3 and flexible sheet 4.5
Distance, but the size of specific flow is adjusted in this traffic level.
Embodiment 1
As shown in figure 5, Constant flow sample flow-limiting valve of the invention is applied to sample can 7.By adopting for Constant flow sample flow-limiting valve
Sample tank interface 6 is fixedly connected with the air inlet of sample can 7.After determining a kind of metering hole 3 of specification, rotation can be passed through
Bolt 4.1 is adjusted to adjust the specific flow of flow-limiting valve.After having adjusted flow, protection nut 4.11 can be covered, for solid
The position (thus fixed sample flow) of fixed piston formula nozzle 4.3.
The sampling of average sample can be carried out by opening protection nut cap 1.1.
The constant current performance of Constant flow sample flow-limiting valve of the invention is tested: using 3 liters of tanks, sample within 3 hours
When, it is the sapphire metering hole of 0.07mm that metering hole 3, which selects aperture, the flow of flow-limiting valve is adjusted to 14.4mL/min, and to adopting
The overall process of sample carries out flow measurement, as a result sees Fig. 6.As seen from Figure 6, the current limliting within 3 hours sampling times, in the present invention
Valve can by stability of flow constant current in 14.4 mL/min of target flow or so, really meet the requirement of Constant flow sample.What is maintained adopts
The flow of sample can be stabilized to always 200 minutes or so, and sample can is adopted full substantially at this time, and vacuum degree only has 3inHg or so, stream
Amount just starts dramatic decrease.
Claims (10)
1. a kind of Constant flow sample flow-limiting valve, it is characterised in that: the Constant flow sample flow-limiting valve includes metering hole and main valve body, the limit
Discharge orifice is connected to air inlet, and the main valve body includes main cover body and rear cover, and there are two cavity, one is perforation for setting in main cover body
Gas channels, the gas channels one end are connected to metering hole, and the other end is provided with the sample can interface that can be connected to sample can；Another
For the space between main lid and rear cover, interior to be equipped with flexible sheet, the flexible sheet and main cover body are in sealing contact, in flexible sheet
There are elastic cavities between gas channels wall；Rear cover is located at the outside of flexible sheet, and fixes with main cover body；
Piston type nozzle is provided in the gas channels, gas channels are air inlet section and outlet by piston type nozzle partition
Section；
It is connected between the air inlet section of the gas channels and elastic cavity, air outlet section of the elastic cavity through piston type nozzle and gas channels
Connection；
It is covered after described and offers atmospheric pressure balance port.
2. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: the air inlet is provided with particulate matter filtering
Device is filled with the stainless steel sintered sheets filtering material that aperture is 1-7 μm in the particulate filter.
3. Constant flow sample flow-limiting valve according to claim 2, it is characterised in that: between the particulate filter and metering hole
It is connected by sample introduction bend pipe.
4. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: also set between the flexible sheet and rear cover
It is equipped with diaphragm compress gasket, which pushes down the periphery of flexible sheet.
5. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: be additionally provided with protrusion on the outside of the main cover body
Described screwed hole post, piston type nozzle has an end of thread, which is located in the described screwed hole post, is also connected in described screwed hole post
Bolt is adjusted, the inner end of the adjusting bolt resists the end of thread of piston type nozzle, and outer end is equipped with protection nut.
6. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: be additionally provided with fixing in the gas channels
Part, piston type nozzle are fixed on the holding firmware.
7. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: the periphery of the flexible sheet is located at elastic cavity
Side passes through diaphragm seal O-ring and main cover body sealed set.
8. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: the main valve body is additionally provided with pressure gauge and connects
Mouthful, which connects main cover body, and is connected to the air outlet section of gas channels.
9. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: the centre of the flexible sheet is smooth
Face, remaining position are wavy surface.
10. Constant flow sample flow-limiting valve according to claim 1, it is characterised in that: the Constant flow sample flow-limiting valve and sampled air
The component of contact is all made of 316 type stainless cast steel parts, and the flexible sheet is made of 316 soft type stainless steel thin slices.
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| CN112697546A (en) * | 2020-12-08 | 2021-04-23 | 成都市环境保护科学研究院 | Laminated micro-flow hole negative pressure gas sample collecting device and method |
| CN113431523A (en) * | 2021-07-30 | 2021-09-24 | 段元升 | Kelly bar plug valve for oil exploitation construction |
| CN114184434A (en) * | 2021-11-04 | 2022-03-15 | 苏州热工研究院有限公司 | Portable aerosol particle sampling device for nuclear power |
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