CN107570497A - A kind of unperturbed back-blowing device - Google Patents
A kind of unperturbed back-blowing device Download PDFInfo
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- CN107570497A CN107570497A CN201710932041.8A CN201710932041A CN107570497A CN 107570497 A CN107570497 A CN 107570497A CN 201710932041 A CN201710932041 A CN 201710932041A CN 107570497 A CN107570497 A CN 107570497A
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Abstract
A kind of unperturbed back-blowing device belongs to gas composition monitoring technical field, more particularly to a kind of unperturbed back-blowing device.The present invention provides a kind of successional unperturbed back-blowing device for ensureing instrument measurement.The present invention includes air cavity, its structural feature air cavity upper center is provided with mixing chamber exhaust non-return flap, air cavity upper end is provided with the probe purging check nozzle of middle part blowing upward around mixing chamber exhaust non-return flap, air cavity lower end centre exit is provided with aspiration pump, air cavity lower end inner wall is provided with air bladder around air cavity lower end centre exit, air bladder periphery is connected with air cavity wall, it is compressed air cell between air bladder and air cavity lower end inner wall, it is sample air cavity between air bladder and air cavity upper end inwall, compressed air cell is connected with compressed air intake and exhaust equipment.
Description
Technical field
The invention belongs to gas composition monitoring technical field, more particularly to a kind of unperturbed back-blowing device.
Background technology
With economic technology development and society progress, people to environmental quality especially air quality requirements increasingly
Height, at the same time produces the energy, the production process of the material such as steel produces a large amount of pernicious gases again, and both oppose contradiction.So
Us are required to seek the equalization point of environmental quality and material requisite, and the measurement of pernicious gas just turns into important the one of balance
Ring.In addition, the gas componant measured in other production and living such as oxygen, carbon monoxide, ammonia etc. are also equal to gas pollutant
Measurement.
Existing gas monitoring system sampler is more, and because gas pipeline sectional area is big, pipeline straight section is short, single-point sampling etc.
Factor can not find representative sample point so that detected sample gas gas content produces larger inclined with overall gas content
Difference.In addition, because causing sampling bye-pass, probe filter core to be frequently occluded containing a large amount of solid impurities in tested gas, existing blowback is blocked up
Plug thing method is mostly compressed air blowback or physics dredging, and blowback process can not carry out gas continuous monitoring, affecting parameters monitoring
And Industry restructuring.
The content of the invention
The present invention is aiming above mentioned problem, there is provided a kind of successional unperturbed back-blowing device for ensureing instrument measurement.
To achieve the above object, the present invention adopts the following technical scheme that, the present invention includes air cavity, on its structural feature air cavity
End middle part is provided with mixing chamber exhaust non-return flap, and air cavity upper end is provided with middle part upward around mixing chamber exhaust non-return flap and dried
Probe purging check nozzle, air cavity lower end centre exit is provided with aspiration pump, and air cavity lower end inner wall is in the middle part of air cavity lower end
Outlet is provided with air bladder, and air bladder periphery is connected with air cavity wall, is compression between air bladder and air cavity lower end inner wall
Air chamber, is sample air cavity between air bladder and air cavity upper end inwall, and compressed air cell is connected with compressed air intake and exhaust equipment.
Upper end is connected with spring tray in the middle part of air bladder, and spring tray intermediate openings connect with air cavity lower end centre exit
It is logical, it is provided with air-breathing spring between spring tray and air cavity upper end inwall.
As a kind of preferred scheme, a hollow air discharge axle lower end of the invention sequentially passes through spring tray intermediate openings, air cavity
Lower end centre exit is connected with pumping pump inlet, and hollow air discharge axle upper end exposes spring tray intermediate openings and is provided with sealing
Platen, upper sealing platen lower surface mutually extrudes with upper surface in the middle part of spring tray, on the outside of the hollow air discharge axle of compressed air intracavitary
Lower sealing platen is provided with, lower sealing platen upper surface mutually extrudes with lower surface in the middle part of air bladder；It is lower sealing platen with it is upper close
Envelope platen is fastenedly connected, and hollow air discharge axle upper end, spring tray, air bladder middle part is linked together.
As another preferred scheme, hollow air discharge axle lower end of the present invention is by being vented telescoping tube and pumping pump inlet
It is connected.
As another preferred scheme, hollow air discharge axle of the present invention passes through sealing ring and air cavity lower end centre exit phase
Even.
As another preferred scheme, air-breathing spring of the present invention is four, uniform around spring tray intermediate openings.
As another preferred scheme, compressed air intake and exhaust equipment of the present invention includes what is connected with compressed air cell
Air inlet-outlet pipe, air inlet-outlet pipe outer end are connected with purging triple valve first end, purging triple valve second end respectively with compressed air source
It is connected with compressed air reservoir, purging triple valve the 3rd end is exhaust outlet；Purge triple valve control signal input mouth with
The control signal output mouth of controller is connected.
As another preferred scheme, sample air cavity air bleeding valve, sample air cavity row are provided with hollow air discharge axle of the present invention
The control signal input mouth of air valve is connected with the control signal output mouth of controller.
As another preferred scheme, limited location feedback board is set, corresponding to spacing on hollow air discharge axle of the present invention
Feedback board, which is provided with, purges limit switch and lower sampling limit switch, the detection signal output port of upper purging limit switch,
The detection signal output port of lower sampling limit switch is connected with the detection signal input port of controller respectively.
As another preferred scheme, probe purging check upper end of nozzle axle of the present invention connect can outwards above dig
Non-return flap.
As another preferred scheme, air cavity of the present invention includes upper the air cavity housing and lower air chamber shell of make-up connection
Body, upper air cavity housing are connected with lower air chamber housing to buckle by upper lower flange, and air bladder periphery is clipped between lower flange.
As another preferred scheme, present invention additionally comprises multiple spot spiral-flow type gas sampling device, multiple spot cyclone gas
Sampler includes eddy flow mixing chamber and multiple sampling branch pipes, and each branch pipe sample point that samples is in the radially uniform arrangement of flue；Sampling
Branch pipe connects with eddy flow mixing chamber, and sampling branch outlet direction is evenly distributed by same clockwise in eddy flow mixing chamber；Rotation
Analysis meter probe or sampling probe mounting interface are provided with above stream mixing chamber；Eddy flow mixing chamber is arranged on the air cavity upper end
Middle part, eddy flow mixing chamber lower end is vented non-return flap by the mixing chamber and probe purging check nozzle connects with air cavity.
As another preferred scheme, each sampling branch pipe sample point of the present invention reaches in the radially uniform arrangement of pipeline
Multi-point grid method sampling request；Before putting into operation, every sampling branch pipe sample throughput is adjusted into, makes every sampling branch pipe sample throughput
It is identical；Sampling branch pipe connects with eddy flow mixing chamber, and evenly distributed by same clockwise in eddy flow mixing chamber so that gas
Eddy flow is formed after into mixing chamber to be sufficiently mixed；The aspiration pump makes flue gas be flowed in air cavity, and drives eddy flow to mix
Flow of flue gas in room and each sampling branch pipe.
As another preferred scheme, the number of sampling branch pipe of the present invention is four.
As another preferred scheme, eddy flow mixing chamber of the present invention is cylinder.
As another preferred scheme, sampling branch pipe of the present invention includes top branch pipe and the sampling stretched into inside flue
Probe, sampling probe lower end is step structure, and sampling probe top is connected with walling of flue by tuning joint, sampling probe upper end
It is connected by dismantled and assembled connector with top branch pipe lower end.
As another preferred scheme, tuning joint of the present invention includes connector, and connector lower end is welded with walling of flue
Connect, sampling probe passes through connector middle through-hole, and connector upper end outer wall is provided with external screw thread, and connector upper end inwall is angle
Structure, a round table-like cutting ferrule lower end are sandwiched in angle and are placed on the outside of sampling probe, and connector upper end is rotary with and the external screw thread
The nut being engaged, nut upper end inwall mutually extrude with cutting ferrule upper surface.
As another preferred scheme, dismantled and assembled connector of the present invention includes hollow joint body, sampling probe upper end
Insert in fittings body bottom, top branch pipe lower end is inserted in fittings body top, and fittings body top and bottom outer wall is provided with outer
Screw thread and the nut being engaged with external screw thread, fittings body top and bottom outer wall are inclined opening structure, a round table-like cutting ferrule lower end
It is sandwiched in angle, the cutting ferrule of fittings body upper end is placed on the outside of the branch pipe of top, and the cutting ferrule of fittings body lower end is placed on the outside of sampling probe；
The nut upper end inwall of fittings body upper end mutually extrudes with the cutting ferrule upper surface of fittings body upper end, in the nut lower end of fittings body lower end
Wall and the cutting ferrule lower surface of fittings body lower end mutually extrude.
As another preferred scheme, the present invention makes to enter each sampling by adjusting direction of the step in flue gas stream
The sample throughput of branch pipe is identical.
As another preferred scheme, sampling branch pipe of the present invention is inverted L-shaped pipe；Sample branch pipe upper end transverse tube and eddy flow
Mixing chamber sidewall weld is connected with anchor ear joint.
As another preferred scheme, analysis meter of the present invention is using the analysis meter for possessing self-suction function, sampling
Branch outlet is arranged on analysis meter probe lower section.
As another preferred scheme, the analysis meter of the present invention for possessing self-suction function is using snow enlightening dragon SCS-900C
Type analysis instrument.
As another preferred scheme, analysis meter of the present invention is taken using the analysis meter for not possessing self-suction function
Sample branch outlet is arranged on analysis meter probe middle and upper part.
As another preferred scheme, the analysis meter of the present invention for not possessing self-suction function uses the types of AMETEK 210
Oxygen analyser.
As another preferred scheme, present invention additionally comprises temperature in detection sampling branch pipe temperature sensor, detection flue
Sensor, the detection signal input port of controller sample the detection signal output end of branch pipe temperature sensor with detection respectively
The detection signal output port of temperature sensor is connected in mouth, detection flue.
As another preferred scheme, detection sampling branch pipe temperature sensor of the present invention is arranged on sampling branch pipe and cigarette
Above road junction in two meters of sampling branch pipe outer wall.
As another preferred scheme, the sampling branch pipe outer wall between eddy flow mixing chamber and flue of the present invention is except detection
Isothermal holding is done at sampling branch pipe temperature sensor setting.
As another preferred scheme, each sampling branch pipe temperature of controller detection of the present invention, if a certain sampling branch pipe
When temperature and other sampling branch pipe temperature or flue temperature deviation exceed setting value, controller sends sampling branch blockage letter
Number.
As another preferred scheme, sample air cavity volume of the present invention is more than eddy flow mixing chamber and each sampling bye-pass body
Product sum.
Secondly, sampling branch pipe magnetic valve is provided with the transverse tube of sampling branch pipe upper end of the present invention, samples branch pipe magnetic valve
Control signal input mouth be connected with the control signal output mouth of controller.
In addition, the depth that sampling branch pipe of the present invention is stretched into inside flue is different.
Beneficial effect of the present invention.
When blowback of the present invention starts, air cavity volume contraction extruding sample gas enters eddy flow mixing chamber to meter probe filter core and each
Sampling branch pipe is purged.At the end of blowback, air cavity volumetric expansion produces negative pressure and sucked through each sampling branch pipe and eddy flow mixing chamber
Air cavity.
For the present invention in use, aspiration pump is connected with flue, aspiration pump air-breathing makes flue gas be flowed in unperturbed back-blowing device, and
Through being vented non-return flap, eddy flow mixing chamber and sampling flow of flue gas in branch pipe.Pumping pump discharge can be positioned on flue outer wall by flange,
Flue gas is flow back in flue.Purging is sample gas with gas, and sample air-blowing enter eddy flow mixing chamber and sampling bye-pass after can rapidly will newly
Sample aspiration returns, it is ensured that the continuity of instrument measurement.
Compression of the invention using air cavity discharges with expansion, sucks back sample gas, is popped one's head in and pipeline purges, reach purged
Cheng Lianxu unperturbeds measure.
Local pressure of the dispersible air-breathing spring of spring tray of the present invention to air bladder.
Brief description of the drawings
The present invention will be further described with reference to the accompanying drawings and detailed description.The scope of the present invention not only limits to
In the statement of herein below.
Fig. 1 is schematic structural view of the invention.
Fig. 2 is eddy flow mixing chamber top view of the present invention.
Fig. 3 is present invention probe purging check nozzle arrangements schematic diagram.
Fig. 4 is tuning joint design schematic diagram of the present invention.
Fig. 5 is the dismantled and assembled connector structural representation of the present invention.
In figure, 1, sampling branch pipe magnetic valve；2nd, branch outlet is sampled；3rd, measuring instrumentss filter probe device；4th, eddy flow mixes
Room；5th, branch pipe is sampled；6th, compressed air reservoir；7th, threeway valve exhaust is purged；8th, probe purging check nozzle；9th, sample air cavity；
10th, upper lower air chamber housing；11st, air-breathing spring；12nd, it is vented non-return flap；13rd, branch pipe temperature is sampled；14th, upper sealing platen；15th, gas
Dynamic film；16th, upper and lower cavity wall and air bladder adpting flange bolt；17th, triple valve is purged；18th, air inlet-outlet pipe；19th, middle idle discharge
Gas axle；20th, spring tray；21st, compressed air cell；22nd, compressed air source；23rd, sealing ring；24th, sample air cavity air bleeding valve；25th, control
Device processed；26th, it is vented telescoping tube；27th, dismantled and assembled connector；28th, tuning joint；29th, aspiration pump；30th, flue；31st, blast pipe；
32nd, flue temperature；33rd, step structure；34th, upper purging limit switch；35th, lower sampling limit switch；36th, spacing feedback board；37、
Probe purging check nozzle off status；38th, probe purging check nozzle open state；39th, nut；40th, sampling probe；41st, cutting ferrule；
42nd, connector；43rd, top branch pipe；44th, fittings body.
Embodiment
As illustrated, the present invention includes air cavity, air cavity upper center is provided with mixing chamber exhaust non-return flap 12, air cavity upper end
The probe purging check nozzle 8 of middle part blowing upward is provided with around mixing chamber exhaust non-return flap 12, is gone out in the middle part of air cavity lower end
Mouth is provided with aspiration pump 29, and air cavity lower end inner wall is provided with air bladder 15, air bladder 15 around air cavity lower end centre exit
Periphery is connected with air cavity wall, is compressed air cell 21, air bladder 15 and air cavity between air bladder 15 and air cavity lower end inner wall
It is sample air cavity 9 between the inwall of upper end, compressed air cell 21 is connected with compressed air intake and exhaust equipment.
The middle part upper end of air bladder 15 is connected with spring tray 20, and the intermediate openings of spring tray 20 in the middle part of air cavity lower end with going out
Mouth connection, air-breathing spring 11 is provided between spring tray 20 and air cavity upper end inwall.
A hollow air discharge axle lower end of the invention sequentially passes through the intermediate openings of spring tray 20, air cavity lower end centre exit with taking out
The import of air pump 29 is connected, and the upper end of hollow air discharge axle 19 exposes the intermediate openings of spring tray 20 and is provided with sealing platen 14, on
The sealing lower surface of platen 14 mutually extrudes with the middle part upper surface of spring tray 20, the outside of hollow air discharge axle 19 in compressed air cell 21
Lower sealing platen is provided with, lower sealing platen upper surface mutually extrudes with the middle part lower surface of air bladder 15；It is lower sealing platen with it is upper
Sealing platen 14 is fastenedly connected, and the upper end of hollow air discharge axle 19, spring tray 20, the middle part of air bladder 15 is linked together.It is logical
Crossing sealing platen can be reliably connected hollow air discharge axle 19, spring tray 20, air bladder 15.
The lower end of hollow air discharge axle 19 is connected by being vented telescoping tube 26 with the import of aspiration pump 29；It is easy to hollow air discharge axle
19 up and down motion.
The hollow air discharge axle 19 is connected by sealing ring 23 with air cavity lower end centre exit；It is reliable to improve sealing property.
The air-breathing spring 11 is four, uniform around the intermediate openings of spring tray 20；The uniform force of spring tray 20, work
Stablize.
The compressed air intake and exhaust equipment includes the air inlet-outlet pipe 18 that is connected with compressed air cell 21, outside air inlet-outlet pipe 18
End is connected with the purging first end of triple valve 17, purge triple valve 17 second end respectively with compressed air source 22 and compressed air gas storage
Tank 6 is connected, and purging triple valve 17 the 3rd end is exhaust outlet；Purge the control of the control signal input mouth and controller of triple valve 17
Signal output port processed is connected.Purging triple valve 17 is set to be easy to the control of the intake and exhaust of compressed air cell 21.
Sample air cavity air bleeding valve 24, the control signal input of sample air cavity air bleeding valve 24 are provided with the hollow air discharge axle 19
Mouth is connected with the control signal output mouth of controller.Sample air cavity air bleeding valve 24 is set to be easy to the gas exhaust inspecting of sample air cavity 9.
Limited location feedback board 36 is set on the hollow air discharge axle 19, and spacing feedback board 36, which is provided with upper purging, to be limited
Bit switch 34 and lower sampling limit switch 35, detection signal output port, the lower sampling limit switch of upper purging limit switch 34
35 detection signal output port is connected with the detection signal input port of controller respectively.Set spacing feedback board 36, on blow
Limit switch 34 and lower sampling limit switch 35 are swept, is easy to the control of the shift position of hollow air discharge axle 19.
The upper shaft of probe purging check nozzle 8 connect can outwards above the non-return flap dug；Simple in construction, non-return effect
Reliably.
The air cavity includes upper the air cavity housing and lower air chamber housing of make-up connection, upper air cavity housing and lower air chamber housing pair
Buckle is connected by upper lower flange, and the periphery of air bladder 15 is clipped between lower flange；It is easy to being reliably connected for air bladder 15.
Present invention additionally comprises multiple spot spiral-flow type gas sampling device, multiple spot spiral-flow type gas sampling device mixes including eddy flow
Room and multiple sampling branch pipes 5, each sample point of branch pipe 5 that samples is in 30 radially uniform arrangement of flue；Sample branch pipe 5 and eddy flow mixing chamber
Connection, the sampling direction of branch outlet 2 are evenly distributed by same clockwise in eddy flow mixing chamber；Set above eddy flow mixing chamber
There are analysis meter probe or sampling probe mounting interface；Eddy flow mixing chamber is arranged on the air cavity upper center, eddy flow mixing chamber
Lower end is vented non-return flap 12 by the mixing chamber and probe purging check nozzle 8 connects with air cavity.Multiple spot equivalent extracts sample gas
Eddy flow is formed in eddy flow mixing chamber, sample gas is uniformly mixed.
Each sampling sample point of branch pipe 5 of the present invention reaches multi-point grid method sampling request in the radially uniform arrangement of pipeline；
Before putting into operation, the every sampling sample throughput of branch pipe 5 is adjusted into, makes the every sampling sample throughput of branch pipe 5 identical；Sample branch pipe 5 with
Eddy flow mixing chamber 4 connects, and evenly distributed by same clockwise in eddy flow mixing chamber 4 so that after gas enters mixing chamber
Eddy flow is formed to be sufficiently mixed；The aspiration pump 29 makes flue gas be flowed in air cavity, and drives eddy flow mixing chamber 4 and each sampling
Flow of flue gas in branch pipe 5.
The number of the sampling branch pipe 5 is four.
The eddy flow mixing chamber 4 is cylinder.
The sampling branch pipe 5 includes top branch pipe 43 and the sampling probe 40 that stretches into inside flue 30, under sampling probe 40
Hold and be connected for step structure 33, the top of sampling probe 40 with the wall of flue 30 by tuning joint 28, the upper end of sampling probe 40 passes through
Dismantled and assembled connector 27 is connected with the lower end of top branch pipe 43.Connected using tuning joint 28, step can be made 360 ° in flue 30
Rotate, by adjusting direction of the step in the air-flow of flue 30（Step to sample to entrance towards gas to compared with backwards to gas
The flue gas flow of branch pipe 5 is big）So that it is identical to enter each sampling sample throughput of branch pipe 5.
The tuning joint 28 includes connector 42, and the lower end of connector 42 is welded with the wall of flue 30, and sampling probe 40 passes through
The middle through-hole of connector 42, the upper end outer wall of connector 42 are provided with external screw thread, and the upper end inwall of connector 42 is inclined opening structure, and one justifies
The lower end of mesa-shaped cutting ferrule 41 is sandwiched in angle and is placed on the outside of sampling probe 40, and the upper end of connector 42 is rotary with to match with the external screw thread
The nut 39 of conjunction, the upper end inwall of nut 39 mutually extrude with the upper surface of cutting ferrule 41.
The dismantled and assembled connector 42 includes hollow joint body 44, and the upper end of sampling probe 40 is inserted in the bottom of fittings body 44,
The lower end of top branch pipe 43 is inserted in the top of fittings body 44, the top and bottom outer wall of fittings body 44 be provided with external screw thread and with outer spiral shell
The nut 39 that line is engaged, the top and bottom outer wall of fittings body 44 are inclined opening structure, and a round table-like lower end of cutting ferrule 41 is sandwiched in tiltedly
Intraoral, the cutting ferrule 41 of the upper end of fittings body 44 is placed on the outside of top branch pipe 43, and the cutting ferrule 41 of the lower end of fittings body 44 is placed on sampling probe
40 outsides；The upper end inwall of nut 39 of the upper end of fittings body 44 mutually extrudes with the upper surface of cutting ferrule 41 of the upper end of fittings body 44, fittings body
The lower end inner wall of nut 39 of 44 lower ends and the lower surface of cutting ferrule 41 of the lower end of fittings body 44 mutually extrude.
The present invention makes the sample throughput phase for entering each sampling branch pipe 5 by adjusting direction of the step in the air-flow of flue 30
Together.
The sampling branch pipe 5 is inverted L-shaped pipe；The sampling upper end transverse tube of branch pipe 5 and the sidewall weld of eddy flow mixing chamber 4 use anchor ear
Joint connects.
The analysis meter is arranged on analysis meter spy using the analysis meter for possessing self-suction function, sampling branch outlet 2
Head lower section；The service life of analysis meter probe can be extended, and reduce dust stratification.
The analysis meter for possessing self-suction function is using snow enlightening dragon SCS-900C type analysis instrument.
The analysis meter is arranged on analysis meter using the analysis meter for not possessing self-suction function, sampling branch outlet 2
Probe middle and upper part；Analysis meter probe and smoke contacts area can be increased.
The analysis meter for not possessing self-suction function uses the type oxygen analysers of AMETEK 210.
Present invention additionally comprises temperature sensor in detection sampling branch pipe temperature sensor, detection flue, the detection of controller
Signal input port samples the detection signal output port of branch pipe temperature sensor with detection, detects TEMP in flue respectively
The detection signal output port of device is connected.
The detection sampling branch pipe temperature sensor is arranged on sampling branch pipe 5 and two meters above the junction of flue 30 of sampling
On the outer wall of branch pipe 5.Temperature sensor is arranged on the sampling outer wall of branch pipe 5, can prevent from sampling blockage.Temperature sensor can also be set
Put in inverted L horizontal segment.Temperature sensor is arranged on sampling branch pipe 5 and two meters above the junction of flue 30, can prevent because of metal tube
The heat transfer in road, caused temperature point misalignment.
The outer wall of sampling branch pipe 5 between the eddy flow mixing chamber 4 and flue 30 is set except detection samples branch pipe temperature sensor
Do isothermal holding in the place of putting.Flue-gas temperature is higher than environment temperature, will heating sampling branch pipe 5 during sample air-flow over sampling branch pipe 5.To protect
When demonstrate,proving the failures such as branch pipe generation blocking, the temperature rapid decrease of branch pipe 5 is sampled, samples and is not incubated at the thermometric of branch pipe 5.
Each sampling temperature of branch pipe 5 of controller detection, if a certain sampling temperature of branch pipe 5 and other sampling temperature of branch pipe 5
Or the deviation of flue temperature 32, when exceeding setting value, controller sends the jam signal of sampling branch pipe 5, control unperturbed back-blowing device enters
Row sampler purges.
The volume of sample air cavity 9 is more than eddy flow mixing chamber 4 and each sampling tunnel volume sum of branch pipe 5；Ensure that pipeline purging fills
Divide, quickly suck back sample gas.
Sampling branch pipe magnetic valve 1, the control letter of sampling branch pipe magnetic valve 1 are provided with the sampling upper end transverse tube of branch pipe 5
Number input port is connected with the control signal output mouth of controller.Under sampling state, sampling branch pipe magnetic valve 1 and sample air cavity row
Air valve 24 is opened, and purging triple valve 17 is closed.
The depth that the sampling branch pipe 5 is stretched into inside flue 30 is different；Detection is more comprehensively, accurately.
Illustrate the course of work of the present invention below in conjunction with the accompanying drawings.
When a jam does occur（Exemplified by sampling branch pipe 5a and block）, sampling branch pipe temperature 13a temperature less than 13b, 13c,
13d, 32d are more, and controller judges that sampling branch pipe 5a is blocked, and send signal-off sample air cavity air bleeding valve 24 and sampling branch pipe electromagnetism
Valve 1b, 1c, 1d, open purging triple valve 17.Compressed air is by compressed air reservoir 6 and compressed air source 22 through air inlet-outlet pipe
18 enter compressed air cell 21, promote air bladder 15 and spring tray 20 to extrude air-breathing spring 11 so that the sample in sample air cavity 9
Gas enters eddy flow mixing chamber 4 by purging check nozzle 8 of popping one's head in and measuring instrumentss filter probe device 3 is purged.At the same time
Exhaust non-return flap 12 is closed automatically, pressure rise in eddy flow mixing chamber 4, and sample gas enters to be purged to sampling branch pipe 5a, spacing
Feedback board 36, which is moved to blow, sweeps limit switch, above sweeps limit switch and signals to purging completion at controller.
After the completion of purging, controller sends signal-off purging triple valve 17, opens sampling branch pipe magnetic valve 1b, 1c, 1d,
Air bladder 15 moves down under the effect of air-breathing spring 11, and the volume-diminished of compressed air cell 21, compressed air is through blast pipe 31
And purging triple valve 17 is discharged, the volumetric expansion of sample air cavity 9 produces negative pressure sampled branch pipe 5a, 5b, 5c, 5d and eddy flow mixing chamber 4
Sample gas is sucked, spacing feedback board 36 is moved at lower sampling limit switch 35, and lower sampling limit switch 35 signals to controller,
Sample air cavity air bleeding valve 24 is opened in controller control, recovers sampling state.Likewise, by controlling sampling branch pipe magnetic valve 1 can be with
Different pipelines is purged.
By compressed air pressure, each several part caliber, the intensity of air-breathing spring 11, chamber volume determine purge cycles length, one
As completed within the several seconds.Purge gas is sample gas, and sample air-blowing enter behind eddy flow mixing chamber 4 and sampling branch pipe 5 tunnel can rapidly by
New sample aspiration returns, it is ensured that the continuity of instrument measurement；Blowback tamper process does not influence gas continuous monitoring.
It is understood that above with respect to the specific descriptions of the present invention, it is merely to illustrate the present invention and is not limited to this
Technical scheme described by inventive embodiments, it will be understood by those within the art that, still the present invention can be carried out
Modification or equivalent substitution, to reach identical technique effect；As long as meet use needs, all protection scope of the present invention it
It is interior.
Claims (10)
1. a kind of unperturbed back-blowing device, including air cavity, it is characterised in that air cavity upper center is provided with mixing chamber exhaust non-return flap,
Air cavity upper end is provided with the probe purging check nozzle of middle part blowing upward around mixing chamber exhaust non-return flap, in air cavity lower end
Portion outlet is provided with aspiration pump, and air cavity lower end inner wall is provided with air bladder, air bladder week around air cavity lower end centre exit
Side is connected with air cavity wall, is compressed air cell, air bladder and air cavity upper end inwall between air bladder and air cavity lower end inner wall
Between be sample air cavity, compressed air cell is connected with compressed air intake and exhaust equipment；
Upper end is connected with spring tray in the middle part of air bladder, and spring tray intermediate openings connect with air cavity lower end centre exit, bullet
Air-breathing spring is provided between spring bracket disk and air cavity upper end inwall.
2. a kind of unperturbed back-blowing device according to claim 1, it is characterised in that a hollow air discharge axle lower end sequentially passes through bullet
Spring bracket disk intermediate openings, air cavity lower end centre exit are connected with pumping pump inlet, and hollow air discharge axle upper end is exposed in spring tray
Portion's opening is simultaneously provided with sealing platen, and upper sealing platen lower surface mutually extrudes with upper surface in the middle part of spring tray, compressed air
Lower sealing platen is provided with the outside of the hollow air discharge axle of intracavitary, lower sealing platen upper surface is mutually squeezed with lower surface in the middle part of air bladder
Pressure；Lower sealing platen is fastenedly connected with upper sealing platen, connects hollow air discharge axle upper end, spring tray, air bladder middle part
Together.
3. a kind of unperturbed back-blowing device according to claim 2, it is characterised in that the hollow air discharge axle lower end passes through exhaust
Telescoping tube is connected with pumping pump inlet.
A kind of 4. unperturbed back-blowing device according to claim 2, it is characterised in that the hollow air discharge axle by sealing ring with
Air cavity lower end centre exit is connected.
5. a kind of unperturbed back-blowing device according to claim 1, it is characterised in that the air-breathing spring is four, around spring
Pallet intermediate openings are uniform.
6. a kind of unperturbed back-blowing device according to claim 1, it is characterised in that the compressed air intake and exhaust equipment includes
The air inlet-outlet pipe connected with compressed air cell, air inlet-outlet pipe outer end are connected with purging triple valve first end, purge triple valve second
End is connected with compressed air source and compressed air reservoir respectively, and purging triple valve the 3rd end is exhaust outlet；Purge triple valve
Control signal input mouth is connected with the control signal output mouth of controller.
7. a kind of unperturbed back-blowing device according to claim 2, it is characterised in that be provided with sample gas on the hollow air discharge axle
Chamber air bleeding valve, the control signal input mouth of sample air cavity air bleeding valve are connected with the control signal output mouth of controller.
8. a kind of unperturbed back-blowing device according to claim 2, it is characterised in that limited location is set on the hollow air discharge axle
Feedback board, spacing feedback board is provided with upper purging limit switch and lower sampling limit switch, upper purging limit switch
The detection signal output port detection signal input with controller respectively of detection signal output port, lower sampling limit switch
Mouth is connected.
A kind of 9. unperturbed back-blowing device according to claim 1, it is characterised in that the probe purging check upper end of nozzle axle
Connecing can the outside non-return flap dug of top.
10. a kind of unperturbed back-blowing device according to claim 1, it is characterised in that the air cavity includes the upper gas of make-up connection
Cavity shell and lower air chamber housing, upper air cavity housing are connected with lower air chamber housing to buckle by upper lower flange, air bladder periphery
It is clipped between lower flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US5797517A (en) * | 1996-10-25 | 1998-08-25 | Primary Delivery Systems, Inc. | Liquid pump dispenser with tri-purpose nozzle |
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| CN107570497B (en) | 2023-04-07 |
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