CN209525153U - A kind of isokinetic sampling's device of adjustable sample position - Google Patents
A kind of isokinetic sampling's device of adjustable sample position Download PDFInfo
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- CN209525153U CN209525153U CN201920139178.2U CN201920139178U CN209525153U CN 209525153 U CN209525153 U CN 209525153U CN 201920139178 U CN201920139178 U CN 201920139178U CN 209525153 U CN209525153 U CN 209525153U
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Abstract
The utility model is a kind of isokinetic sampling's device of adjustable sample position, including sampling system, monitoring system, controlling and regulating system；The sampling system includes sampling gun and sampling pump, and sampling gun includes sampling muzzle, bend pipe, straight tube, outer cylinder, inner cylinder and sampling gun connecting rod, is arranged with slidably sliding block on outer tube wall, is fixedly connected with sampling gun connecting rod in the outer cylinder lower end at sliding block rear portion；The controlling and regulating system includes controller, sliding stand, sliding stand connecting rod, pallet with a scale, and the pallet with a scale includes disk, position-limit mechanism and bearing with a scale, disk and bearing arranged concentric；The position-limit mechanism is that band is magnetic pointer, the aperture of pointer one end and is fixed with sampling gun connecting rod lower end, and the pointer other end is directed toward the scale of disk；Sampling gun connecting rod lower end passes through position-limit mechanism and places within the bearing, bearing and outer cylinder is connected together by sampling gun connecting rod, position-limit mechanism can be rotated around bearing.The device can flexible modulation sample position, while realizing isokinetic sampling.
Description
Technical field
The utility model relates to a kind of sampling apparatus, especially a kind of isokinetic sampling's device of adjustable sample position.
Background technique
Isokinetic sampling's principle is followed when being sampled.Particulate matter has certain quality, due to itself in flue
The effect of inertia of movement, cannot change direction with air-flow completely needs to obtain representational smoke sample from flue
Speed sampling, i.e., flue gas flow rate is equal with sample rate.When sample rate is greater than sampled point flue gas flow rate, since large particle is used
Property it is big, it is not easy to change direction, so the fraction other than sampling mouth edge is drawn into sampling mouth, and grit therein is by original
Direction is advanced, and does not enter sampling mouth, relatively low so as to cause measurement result middle particle concentration.When sample rate is less than sampled point flue gas
When flow velocity, then just the opposite.When air-flow main body speed is equal to sample rate, air-flow of the row to thief hatch edge will not flow
To change, entrained by particle will not change the direction of motion, so when sampled concentrations and actual concentration it is equal.
In order to keep sampling more representative, it is proposed that use multidraw method, choose and obtain different location sampling more as far as possible
Point is sampled, and the influence of fortuitous event and error can be eliminated as much as.
The patent of invention of Patent No. 201510089120.8 proposes a kind of isokinetic sampling's rifle, including sampling pipe, dilution
Pipe, chamber, zero air flow control unit, pressure difference acquisition unit and sampling pump, sampling pipe use L-type bend pipe structure, sampling
Head is located in flue, and level-one dilution tube arrival end is goed deep into outlet end.It is disadvantageous in that, which can only be to one
A sample point sampling, sample point is single, and L-type bend pipe right angle is easy to happen deposition, influences data accuracy.
The patent of Patent No. 201720366829.2 proposes a kind of flue gas constant-speed sampling device.Device include flue,
Measuring system, control system, adjustment actuating mechanism and sampling system acquire flue gas in flue and sampling system by measuring system
Pressure information, signal reach control system, after information analysis control to adjust executing agency movement, by motor drive retarder and
Shaft coupling, shaft coupling drive adjustable plate to rotate by connecting rod, are taken by changing flue gas flow channel size control in sampling system
The flow velocity of sample flue gas, sampling system sample flue gas.It is disadvantageous in that this system sample point is less, obtains data representative
Property it is insufficient, while control system has certain hysteresis quality, and adjustable plate starting rotation needs certain time, cannot be in time to pressure
Variation generates adjusting.
Utility model content
The purpose of this utility model is to provide a kind of isokinetic sampling's device of adjustable sample position, which can
Guarantee the accuracy of sampling with flexible modulation sample position.
To achieve the above object, the utility model takes following technical scheme:
A kind of isokinetic sampling's device of adjustable sample position, including sampling system, monitoring system, controlling and regulating system；
The sampling system samples flue gas；Flue gas pressures information in the monitoring system acquisition flue and sampling system, it is described
Controlling and regulating system is connect with monitoring system, sampling system, for receiving the pressure information of monitoring system transmitting, control sampling cigarette
The flow velocity of gas, while controlling sampling gun back-and-forth motion；It is characterized in that,
The sampling system includes sampling gun and sampling pump, and sampling gun includes sampling muzzle, bend pipe, straight tube, outer cylinder, inner cylinder
With sampling gun connecting rod, samples muzzle and connect with bend pipe by being threadedly engaged, bend pipe is fixed on the end face of sampling tube, bend pipe
It is worked in coordination with straight tube by screw thread, guarantees bend pipe and the sealing joint of straight tube and inner hole communicates；It is adopted by subsequent straight tube end
Solenoid valve is arranged on the pipeline between sampling pump and straight tube in sample piping connection sampling pump；Sampling gun outer cylinder and inner cylinder coaxial sleeve
It connects, slidably sliding block is arranged on outer tube wall, be fixedly connected with sampling gun connecting rod in the outer cylinder lower end at sliding block rear portion；
The controlling and regulating system includes controller, sliding stand, sliding stand connecting rod, pallet with a scale and alarm device, control
Device processed is electrically connected with alarm device, the driving mechanism of sliding stand, solenoid valve, sampling pump, monitoring system；Pallet lower end with a scale is logical
It crosses sliding stand connecting rod to be fixedly connected with sliding stand, sliding stand connecting rod can be moved forward and backward under the action of sliding stand；
The pallet with a scale includes disk, position-limit mechanism and bearing with a scale, disk and bearing arranged concentric；The limit
Position mechanism is that band is magnetic pointer, the aperture of pointer one end and is fixed with sampling gun connecting rod lower end, and the pointer other end is directed toward disk
Scale；Sampling gun connecting rod lower end passes through position-limit mechanism and places within the bearing, and bearing and outer cylinder are connected in one by sampling gun connecting rod
It rises, position-limit mechanism can be rotated around bearing.
The monitoring system is made of two Pitot tubes, including measurement Pitot tube A and measurement Pitot tube B, each Pitot tube
Controller is connected by corresponding differential pressure pickup, measurement Pitot tube A protrudes into flue measurement flue gas flow rate, measures Pitot tube B
Protrude into sampling gun straight tube measurement sampling flue gas flow rate.
The course of work of the device is:
When device works, the specific location of sampled point is determined according to flue size and relevant criterion, sampling gun is passed through into cigarette
Sample inlet on road puts in flue, sets sampling gun moving distance and residence time by controller, controls sliding stand band
Sampling gun is moved to corresponding sampled point in flue by dynamic sliding stand connecting rod, then is rotated sampling gun by rolling bearing and realized same circle
The sampling of difference on week；
Muzzle face flue gas stream direction when sampling, the seam between sliding outer cylinder top shoe sealing sampling gun and sample inlet
Gap prevents flue gas from escaping；Opens solenoid valve provides power by sampling pump；
Measure the pressure difference of stagnation pressure and static pressure in Pitot tube A measurement flue, stagnation pressure and quiet in measurement Pitot tube B measurement sampling pipe
Pressure, is transmitted to controller via differential pressure pickup for information；
Controller is by being calculated flue gas flow rate V1 and sampling pipe flue gas flow rate V2 in flue, and calculating difference, when adopting
Sample speed is different from velocity of flue gas, this information is passed to alarm device, alarm device issues early warning, operator is made to recognize to ask
Topic occurs；The solenoid valve that signal transmitting connection straight tube and sampling pump will be controlled simultaneously, pressure is controlled by control electromagnetism valve opening
Difference achievees the purpose that isokinetic sampling to realize control flow of flue gas speed；
By making controller move set distance after the corresponding time in advance in controller setting away from discrete time,
Realize the controller automatic control mobile to sampling gun；At the end of sampling, sampling gun is controlled by controller and exits flue.
The course of work of the device is:
When device works, the specific location of sampled point is determined according to flue size and relevant criterion, sampling gun is passed through into cigarette
Sample inlet on road puts in flue, sets sampling gun moving distance and residence time by controller, controls sliding stand band
Sampling gun is moved to corresponding sampled point in flue by dynamic sliding stand connecting rod, then is rotated sampling gun by rolling bearing and realized same circle
The sampling of difference on week；
Muzzle face flue gas stream direction when sampling, the seam between sliding outer cylinder top shoe sealing sampling gun and sample inlet
Gap prevents flue gas from escaping；Opens solenoid valve provides power by sampling pump；
Measure the pressure difference of stagnation pressure and static pressure in Pitot tube A measurement flue, stagnation pressure and quiet in measurement Pitot tube B measurement sampling pipe
Pressure, is transmitted to controller via differential pressure pickup for information；
Controller is by being calculated flue gas flow rate V1 and sampling pipe flue gas flow rate V2 in flue, and calculating difference, when adopting
Sample speed is different from velocity of flue gas, this information is passed to alarm device, alarm device issues early warning, operator is made to recognize to ask
Topic occurs；The solenoid valve that signal transmitting connection straight tube and sampling pump will be controlled simultaneously, pressure is controlled by control electromagnetism valve opening
Difference achievees the purpose that isokinetic sampling to realize control flow of flue gas speed；
By making controller move set distance after the corresponding time in advance in controller setting away from discrete time,
Realize the controller automatic control mobile to sampling gun；At the end of sampling, sampling gun is controlled by controller and exits flue.
Compared with prior art, the utility model has the beneficial effects that
(1) in present apparatus sampling system, part straight tube is replaced using bend pipe, deposits bring shadow in flow process to reduce
It rings, while being threadedly coupled and being used to ensure leakproofness with sliding block, prevent the inadequate bring of air-tightness from influencing.It is added between inside and outside sleeve
Thermal insulation material reduces gas condensation to avoid temperature.
(2) present apparatus uses a sampling gun, and the sampling of multiple spot is realized by the movement of sampling gun and rotation, here more
Point sampling can be multiple points on same straight line, multiple sampled points on same circumference can also be acquired, as far as possible to more
Multiple spot is sampled, and sampled data is more accurate.
(3) present apparatus drives sliding stand connecting rod 7 by the mobile sliding stand 6 of controlling and regulating system, so that sampling gun is driven, it can
To realize moving horizontally for sampling gun, while PLC controller can give moving distance and traveling time, so that operation is more just
It is prompt；At the same time, by the bearing and sampling gun connecting rod 2g on disk with a scale, disk, sampling gun may be implemented in same water
Rotation in plane, it is therefore prevented that sampling gun, which moves up and down, to have an adverse effect, while having obtained more representative samplings
Point.
(4) present apparatus is equipped with alarm device (alarm device), can more intuitively show the accuracy of sampling process.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for isokinetic sampling's device that sample position is adjusted in the utility model；
Fig. 2 is the schematic diagram of the section structure that sampling gun in isokinetic sampling's device of sample position is adjusted in the utility model；
Fig. 3 is the structural schematic diagram that pallet with a scale in isokinetic sampling's device of sample position is adjusted in the utility model；
Fig. 4 (a) is the position view for the sampled point that the same circular arc of rotary course can use；
Fig. 4 (b) is that rotary course is circular arc schematic diagram where possible sample point in flue；
Fig. 4 (c) is that sampled point divides schematic diagram in translation motion；
In figure, 1. flues, 2. sampling guns, 3. measurement Pitot tube A, 4. measurement Pitot tube B, 5. controllers, 6. sliding stands, 7.
Sliding stand connecting rod, 8. pallets with a scale, 9. sampling pumps, 10. solenoid valves, 11. differential pressure pickup A, 12. differential pressure pickup B, 13 is alert
Reporting device；2a. samples muzzle, and 2b. bend pipe, 2c. straight tube, 2d. inner cylinder, 2e. outer cylinder, 2f. sliding block, 2g. sampling gun connecting rod, 81 are
Disk, 82 be position-limit mechanism, and 83 be bearing.
Specific embodiment
The utility model is described in detail below with reference to embodiment, but does not protect model in this, as to the application
The restriction enclosed.
Isokinetic sampling's device of sample position, including sampling system, monitoring system, control and regulation is adjusted in the utility model
System, the sampling system include sampling gun 2 and sampling pump 9, wherein sampling gun 2 include sampling muzzle 2a, gentle transition it is curved
Pipe 2b, straight tube 2c, sampling gun connecting rod 2g, sampling muzzle 2a and bend pipe 2b, are to be threadedly coupled between bend pipe 2b and straight tube 2c, with
Guarantee good air-tightness；Bend pipe is fixed on the end face of sampling tube 2d, replaces L pipe to deposit to reduce particle using bend pipe,
Bend pipe is without significant straight line dog-ear, and in the smooth curved surface releived, existing L-type pipeline right angle is easy deposition and generates unfavorable shadow
It rings, sampling gun mouth and bend pipe must use hard tube, just can guarantee that sampling gun is fixed on desired position；Straight tube also uses hard tube, convenient
Rotation adjusts and movement；It is the clearance fit of arranged concentric between inner cylinder 2d and outer cylinder 2e, central filler thermal insulation material prevents
Asbestos or other heat-resisting materials can be selected in condensation, thermal insulation material；Sliding block 2f is located on outer cylinder, can be axial along sampling gun outer cylinder
Sliding and with sampling gun outer cylinder gap very little, shoe surface be rubber layer or thin glass layer；It is set on the outside of sliding block 2f
Set sampling gun connecting rod 2g.When sampling, sampling gun mouth (sampling gun mouth is to sample muzzle) is moved to specified sampled point and is fixed
Afterwards, the gap between outer cylinder and flue thieff hatch is closely blocked with sliding block, prevents smoke spillage bring from adversely affecting；Sampling pump
9 are connected by pipeline with the arrival end of straight tube 2c, provide necessary negative pressure to be sampled, while between sampling pump and straight tube
Pipeline on be arranged solenoid valve 10, can control the pipeline aperture so as to realize pressure adjust.
Monitoring system includes measurement Pitot tube A 3 and measurement Pitot tube B 4, and measurement Pitot tube A is used to measure in flue
Flue gas flow rate, full pressure hole are directed at flue gas stream direction, and temperature resistant encapsulation device is arranged in flue measurement entrance, keeps leakproofness；It surveys
Amount Pitot tube B is used to measure flue gas flow rate in sampling pipe (straight tube), and full pressure hole is directed at flue gas stream direction, equally measure into
Mouth setting temperature resistant encapsulation device；Two Pitot tubes (measurement Pitot tube A 3 and measurement Pitot tube B 4) pass through phase by route respectively
The differential pressure pickup (differential pressure pickup A 11 and differential pressure pickup B 12) and controlling and regulating system answered are connected via data line, will
The controller that flow velocity signal is transmitted to controlling and regulating system compares and analyzes.
Controlling and regulating system includes controller 5, sliding stand 6, sliding stand connecting rod 7, pallet with a scale 8, alarm device；Control
Device receives the signal from differential pressure pickup, and by calculating comparative analysis speed difference, control alarm device, which issues, to be reminded, alarm dress
It sets 13 to be connected with controller 5, can be lamp, bell etc.；10 extent of opening of solenoid valve is controlled simultaneously, solenoid valve 10 is changed by aperture
Become pumping pressure difference to control flue gas flow rate, to realize isokinetic sampling.Pallet lower end with a scale passes through sliding stand connecting rod and sliding
Platform is fixedly connected, and sliding stand connecting rod 7 can be moved forward and backward under the action of sliding stand；
Pallet 8 with a scale is assembled by disk 81 with a scale, position-limit mechanism 82 and bearing 83, disk and the concentric cloth of bearing
Set, the position-limit mechanism 82 is that band is magnetic pointer, can be absorbed and fixed on some position of disk, the aperture of pointer one end and with adopt
Sample rifle connecting rod lower end is fixed, and the pointer other end is directed toward the scale of disk；Sampling gun connecting rod lower end passes through position-limit mechanism and is placed on axis
In holding, bearing and outer cylinder are connected together by sampling gun connecting rod 2g, position-limit mechanism can be rotated around bearing.Position-limit mechanism 82 is
Approximate small cuboid, is fixed on sampling gun connecting rod and 83 contact position of bearing, and position-limit mechanism can be rotated around bearing, and sampling gun connects
Bar lower end passes through position-limit mechanism and places within the bearing, in use, disk is motionless, position-limit mechanism rotation, and and then sampling gun is driven to connect
Bar rotation, sampling gun connecting rod drives outer cylinder, final to drive sampling muzzle rotation.
Under the premise of known sampling flue width, sliding stand 6 is controlled by controller 5 and drives sliding stand connecting rod 7, sliding stand
7 upper end of connecting rod connects pallet 8 with a scale, and sampling gun outer cylinder connects the position-limit mechanism on pallet 8 with a scale by sampling gun connecting rod,
82 one end of position-limit mechanism more carefully can be used as pointer, and the cylindrical hole that the other end has diameter to be slightly larger than sampling gun connecting rod 2g is convenient
Sampling gun connecting rod 2g is passed through；Disk is fixed on sliding stand connecting rod 7, and sampling gun outer cylinder is connect by bearing with pallet with a scale,
To control, sampling gun is mobile and rotation, progress multi-point sampling keep sampled data more representative, and the controller is
PLC controller, it is more convenient accurate compared to manually controlling.
The course of work are as follows: when device works, the specific location of sampled point is determined according to flue size and related standard, will be adopted
Sample rifle puts in flue by the sample inlet on flue, sets sampling gun moving distance and residence time by controller, control
Sliding stand processed drives sliding stand connecting rod that sampling gun is moved to corresponding sampled point in flue, can be adopted by rolling bearing to rotate
Sample rifle realizes the sampling of difference, simultaneously because sampling gun can translate, sampled point representativeness is greatly increased；It should be noted that sampling
When muzzle answer face (flue gas flow rate direction and sampling muzzle on one wire and flue gas can flow into sampling gun) flue gas stream side
To；The gap between outer cylinder top shoe sealing sampling gun and sample inlet is slided, prevents flue gas from escaping；Opens solenoid valve, by sampling
Pump provides power.
Measure the pressure difference of stagnation pressure and static pressure in Pitot tube A measurement flue, stagnation pressure and quiet in measurement Pitot tube B measurement sampling pipe
Pressure, is transmitted to controller via differential pressure pickup for information.
Controller is by being calculated flue gas flow rate V1 and sampling pipe flue gas flow rate V2 in flue, and calculating difference.When adopting
Sample speed is different from velocity of flue gas, this information is passed to alarm device, alarm device issues early warning, operator is made to recognize to ask
Topic occurs；The solenoid valve that signal transmitting connection sampling pipe (straight tube) and sampling pump will be controlled simultaneously, by controlling electromagnetism valve opening
Pressure difference is controlled, to realize control flow of flue gas speed, achievees the purpose that isokinetic sampling.By in advance controller be arranged away from
Discrete time makes controller in set distance mobile after the corresponding time, realizes the controller automatic control mobile to sampling gun
System, sampling process are more convenient accurate.At the end of sampling, sampling gun is controlled by controller and exits flue.
The utility model application Pitot tube measures corresponding information, by the feedback between differential pressure pickup and controller come real
Existing isokinetic sampling, is realized the movement of sampling gun fixed point simultaneously by controller, realizes same level by pallet with a scale
The rotation in face samples, and ensure that the accuracy of sampling gun acquisition data, while device is relatively simple, cost is relatively low；Alarm device
Setting make operator more readily understand sampling process in variable speed situation.
In the utility model there are two types of the settings of sampled point, Fig. 4 (c) is that the medium sampled point of flue cross section divides schematic diagram.
Flue cross section is divided into multiple homalographic annulus, then annulus is diametrically divided into two parts of area equation, annulus and diameter
Intersection point is sampled point.The prior art can only pass through sliding stand band to two point samplings on arc diameter, utility model device
Dynamic sampling gun is moved forward and backward the sampling that can be completed to such sampled point, realizes multi-point sampling on same straight line.
Fig. 4 (a) be using at bearing as the center of circle, using bearing to the circle that is done by radius of distance of sampling muzzle, in fact, by
Go deep into the limitation of flue length to flue size and sampling gun, angle can not get 360 ° completely, can be on a left side on a circle
Sampled point is taken in right circumference range；But on each circular arc, the number of sampled point is with no restrictions；Fig. 4 (b) is sampled point setting
Regional effect figure.
When sampling gun is without straight tube axial translation, sampling gun rotation is driven by the pallet with a scale, to this
Sampled point is sampled in range, realizes the sampling of multiple sampled points on same section not on the same line.
The utility model does not address place and is suitable for the prior art.
Claims (4)
1. a kind of isokinetic sampling's device of adjustable sample position, including sampling system, monitoring system, controlling and regulating system；Its
It is characterized in that,
The sampling system includes sampling gun and sampling pump, and sampling gun includes sampling muzzle, bend pipe, straight tube, outer cylinder, inner cylinder and adopts
Sample rifle connecting rod, sampling muzzle and bend pipe connects by being threadedly engaged, and bend pipe is fixed on the end face of sampling tube, bend pipe with directly
Pipe is worked in coordination by screw thread；Straight tube end is by subsequent sampling piping connection sampling pump, the pipe between sampling pump and straight tube
Solenoid valve is set on road；Sampling gun outer cylinder and inner cylinder are coaxially socketed, and slidably sliding block is arranged on outer tube wall, at sliding block rear portion
Outer cylinder lower end is fixedly connected with sampling gun connecting rod；
The controlling and regulating system includes controller, sliding stand, sliding stand connecting rod, pallet with a scale, controller and sliding stand
Driving mechanism, solenoid valve, sampling pump, monitoring system electrical connection；Pallet lower end with a scale is solid by sliding stand connecting rod and sliding stand
Fixed connection, sliding stand connecting rod can be moved forward and backward under the action of sliding stand；
The pallet with a scale includes disk, position-limit mechanism and bearing with a scale, disk and bearing arranged concentric；The position restrainer
Structure is that band is magnetic pointer, the aperture of pointer one end and is fixed with sampling gun connecting rod lower end, and the pointer other end is directed toward the scale of disk；
Sampling gun connecting rod lower end passes through position-limit mechanism and places within the bearing, and bearing and outer cylinder are connected together by sampling gun connecting rod, limits
Position mechanism can be rotated around bearing.
2. isokinetic sampling's device of adjustable sample position according to claim 1, which is characterized in that inner cylinder and outer cylinder it
Between fill thermal insulation material, thermal insulation material is asbestos.
3. isokinetic sampling's device of adjustable sample position according to claim 1, which is characterized in that shoe surface is rubber
Glue-line or glass layer.
4. isokinetic sampling's device of adjustable sample position according to claim 1, which is characterized in that the monitoring system
It is made of two Pitot tubes, including measurement Pitot tube A and measurement Pitot tube B, each Pitot tube pass through corresponding pressure difference sensing
Device connects controller, and measurement Pitot tube A protrudes into flue measurement flue gas flow rate, and measurement Pitot tube B protrudes into sampling gun straight tube measurement and adopts
Sample flue gas flow rate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920139178.2U CN209525153U (en) | 2019-01-28 | 2019-01-28 | A kind of isokinetic sampling's device of adjustable sample position |
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| CN201920139178.2U CN209525153U (en) | 2019-01-28 | 2019-01-28 | A kind of isokinetic sampling's device of adjustable sample position |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540613A (en) * | 2019-01-28 | 2019-03-29 | 河北工业大学 | A kind of isokinetic sampling's device of adjustable sample position |
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2019
- 2019-01-28 CN CN201920139178.2U patent/CN209525153U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540613A (en) * | 2019-01-28 | 2019-03-29 | 河北工业大学 | A kind of isokinetic sampling's device of adjustable sample position |
| CN109540613B (en) * | 2019-01-28 | 2024-01-02 | 河北工业大学 | Constant-speed sampling device with adjustable sampling position |
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Granted publication date: 20191022 Termination date: 20220128 |