CN112683604B - Constant-speed sampling device for pressure measurement method - Google Patents
Constant-speed sampling device for pressure measurement method Download PDFInfo
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- CN112683604B CN112683604B CN202011438390.2A CN202011438390A CN112683604B CN 112683604 B CN112683604 B CN 112683604B CN 202011438390 A CN202011438390 A CN 202011438390A CN 112683604 B CN112683604 B CN 112683604B
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- 238000005070 sampling Methods 0.000 title claims abstract description 69
- 238000009530 blood pressure measurement Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 37
- 230000003068 static effect Effects 0.000 claims abstract description 22
- 238000000605 extraction Methods 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims description 20
- 239000008187 granular material Substances 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 17
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000007405 data analysis Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 22
- 239000012535 impurity Substances 0.000 description 21
- 239000002245 particle Substances 0.000 description 13
- 239000002956 ash Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003189 isokinetic effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention relates to the technical field of smoke detection, in particular to a constant-speed sampling device for a pressure measurement method, which comprises a connecting pipe, wherein a first sampling pipe and a second sampling pipe are respectively arranged on one side of the connecting pipe through a flange plate, smoke velocity meters are respectively arranged on the surfaces of the first sampling pipe and the second sampling pipe, a guide pipe is arranged on the surface of each smoke velocity meter, the other side of the connecting pipe is communicated with a total pressure pipe, a differential pressure meter is arranged on the surface of the total pressure pipe, and one end of the total pressure pipe is communicated with a measuring chamber; the invention measures the full pressure, static pressure and flue gas flow rate of the sample gas in real time through the control system, the differential pressure gauge and the flue gas flow rate meter, and then controls the extraction power source to regulate the airflow through the constant-speed regulating device, thereby achieving the purpose of constant-speed sampling, balancing the gas density of the flue gas when the device is used, ensuring the obtained flue gas density to be more accurate, and ensuring the stability and reliability of data analysis when the device is used for sampling.
Description
Technical Field
The invention belongs to the technical field of smoke detection, and particularly relates to a constant-speed sampling device for a pressure measurement method.
Background
A flue gas sampler is a common device in the current market, and is a device for extracting flue gas in a flue to measure particulate matters by a probe inserted into the flue and a power device. Because the humidity of the flue gas in the existing flue is very high, in order to eliminate the influence of liquid water on the measurement of the particulate matters and accurately measure the concentration value of the particulate matters, the humidity of the sample gas must be reduced. The liquid water is reduced to be in a gaseous state, so that real particles in the gas can be measured by a particle detection instrument. At present, the heating method is mainly adopted to reduce the humidity of the sample gas to be measured, and then the corresponding particle detection instrument is matched, so that the concentration of the particles of the extracted sample gas is finally converted into an intuitive numerical value for data analysis.
However, in the current method, the actual flue gas sampling is mostly non-uniform sampling. However, in the case of gas sampling, constant velocity sampling is more advanced than non-constant velocity sampling, and is a necessary condition for obtaining an accurate value of the concentration of particulate matter in the flue. Meanwhile, because the temperature of the sample gas is different from the temperature of the flue gas due to the heating treatment of the flue gas sample, the temperature of the dilution gas is also different, the volumes of the sample gas and the flue gas are different due to the thermal expansion of the gas, the sampling effect is finally influenced, and in the using process of the device, the flue gas can carry a large amount of ash impurities, which are the situation that the impurities can enter the device along with the flue gas, the ash impurities are easy to adhere to the device, the sampling is carried out once, the interior of the device and the interior of the extraction power source can carry a large amount of ash impurities, the extraction power source is easily blocked due to the adhesion of the ash for a long time, once the extraction power source is blocked, the internal elements can be short-circuited, the ash impurities can be accumulated in a measuring chamber of the device, and when the device is used next time, a particle monitor in the device is often influenced by the ash impurities left last time, therefore, the constant-speed sampling device for the pressure measurement method is provided to solve the problem.
SUMMARY OF THE PATENT FOR INVENTION
In view of the above, there is a need for a pressure measurement isokinetic sampling device that overcomes the above problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a constant-speed sampling device of a pressure measurement method comprises a connecting pipe, wherein a first sampling pipe and a second sampling pipe are respectively installed on one side of the connecting pipe through a flange plate, a flue gas velocity meter is installed on the surfaces of the first sampling pipe and the second sampling pipe, a guide pipe is installed on the surface of the flue gas velocity meter, the other side of the connecting pipe is communicated with a total pressure pipe, a differential pressure gauge is installed on the surface of the total pressure pipe, one end of the total pressure pipe is communicated with a measurement chamber, a control system is embedded in the top of the measurement chamber, the bottom of the measurement chamber is communicated with an exhaust pipe, one end of the exhaust pipe is provided with an extraction power source through a flange plate, a constant-speed adjusting device is installed at one end of the extraction power source, a static pressure pipe is installed on one side of the constant-speed adjusting device, an air outlet is formed in the bottom end of the static pressure pipe, and a dustproof mechanism and a particle monitor are respectively arranged in the measurement chamber, and a sealing mechanism is arranged on one side of the measuring chamber.
Preferably, dustproof mechanism includes the frame, the inside embedded filter screen one that has of frame, the inside cover of filter screen one is equipped with filter screen two, the diameter of filter screen two is less than filter screen one, the inside of filter screen two does not contact with filter screen one.
Preferably, sealing mechanism includes sealed lid, the inside symmetry threaded connection of sealed lid have with measuring room threaded connection's installation screw, one side bolt joint of sealed lid has the roof, one side and the contact of filter screen of roof, the seal groove has been seted up to one side of measuring the room, one side that sealed lid is close to the measuring room bonds and has the sealing washer with the seal groove joint.
Preferably, the inside of measuring room is equipped with four sliders, four one side that the slider is close to filter screen one all with filter screen bolt joint, the inside symmetry of measuring room is equipped with the slide rail with slider sliding connection, two one side that the filter screen one was kept away from to the slide rail all with measuring room bolt joint.
Preferably, the inside of filter screen two is equipped with branch, the bottom and the second bolt of filter screen of branch have the board of placing in the top bolt of branch, the bottom of granule monitor with place the board contact, the shape of placing the board is the L shape.
Preferably, the inside of the second filter screen is provided with a screw, the top end of the screw is bolted with the second filter screen, the bottom end of the screw is not in contact with the particle monitor, and the surface of the screw is in threaded connection with a nut.
Preferably, four supporting blocks are arranged inside the frame, one sides, far away from the first filter screen, of the four supporting blocks are all in bolted connection with the first filter screen, and one sides, far away from the first filter screen, of the four supporting blocks are all in bolted connection with the second filter screen.
Preferably, the surface of the measuring chamber is sprayed with a heat-insulating coating, the front surface of the measuring chamber is provided with an observation hole, and transparent glass is embedded in the observation hole.
Preferably, a blower is arranged on the surface of the total pressure pipe, the output end of the blower is communicated with the total pressure pipe, a mounting seat is bolted on one side of the measuring chamber, which is close to the differential pressure gauge, and one side of the mounting seat is bolted with the blower.
Preferably, a threaded pipe is arranged at the bottom end of the static pressure pipe, the top end of the threaded pipe is communicated with the static pressure pipe, and the inside of the threaded pipe is in threaded connection with the top end of the air outlet.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention measures the full pressure, static pressure and flow rate of the flue gas of the sample gas in real time through the control system, the differential pressure gauge and the flue gas flow rate meter, then balances the gas density of the flue gas through the constant-speed adjusting device, and the control system controls the way of adjusting the sample gas by the power source, thereby achieving the purpose of constant-speed sampling and ensuring the stability and reliability of the device for analyzing data during sampling;
2. the invention achieves the purposes of filtering impurities and facilitating cleaning through the mutual matching of the dustproof mechanism and the sealing mechanism, and ensures that ash impurities in smoke cannot enter the interior of an extraction power source along with the smoke in the using process of the device, thereby prolonging the service life of the extraction power source.
Drawings
FIG. 1 is a schematic diagram of a constant velocity sampling apparatus for pressure measurement according to the present invention;
FIG. 2 is a schematic front view of the main structure of a constant velocity sampling apparatus for pressure measurement according to the present invention;
FIG. 3 is a cross-sectional view of the inside of a measuring chamber of the constant velocity sampling apparatus for pressure measurement according to the present invention;
FIG. 4 is a top view of the connection tube, the first sampling tube and the second sampling tube of the constant-velocity sampling device for pressure measurement according to the present invention.
In the figure: 1. a connecting pipe; 2. a first sampling tube; 3. a flue gas flow meter; 4. connecting a guide pipe; 5. a full-pressure pipe; 6. a differential pressure gauge; 7. a measurement chamber; 8. a control system; 9. an air exhaust pipe; 10. extracting a power source; 11. a constant velocity adjusting device; 12. a static pressure tube; 13. an air outlet; 14. a dust-proof mechanism; 141. a frame; 142. a first filter screen; 143. a second filter screen; 15. a particle monitor; 16. a sealing mechanism; 161. a sealing cover; 162. mounting screws; 163. a top plate; 164. a sealing groove; 165. a seal ring; 17. a slider; 18. a slide rail; 19. a strut; 20. placing the plate; 21. a screw; 22. a nut; 23. a support block; 24. heat-insulating paint; 25. an observation hole; 26. transparent glass; 27. a blower; 28. a mounting seat; 29. a second sampling tube; 30. a threaded pipe.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed in many different forms and should not be construed as limited to the embodiments set forth herein.
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1, fig. 1 is a schematic front view of a main structure of an isokinetic sampling device for a pressure measurement method according to the present invention; FIG. 2 is a sectional view of the inside of a measuring chamber of the constant velocity sampling apparatus for pressure measurement according to the present invention; FIG. 3 is a top view of a connection tube, a first sampling tube and a second sampling tube of the constant velocity sampling apparatus for pressure measurement according to the present invention; fig. 4 is a schematic diagram of a constant-velocity sampling device for pressure measurement according to the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a constant-speed sampling device for a pressure measurement method comprises a connecting pipe 1, wherein a first sampling pipe 2 and a second sampling pipe 29 are respectively installed on one side of the connecting pipe 1 through a flange plate, a flue gas velocity meter 3 is installed on the surfaces of the first sampling pipe 2 and the second sampling pipe 29, a guide pipe 4 is installed on the surface of the flue gas velocity meter 3, the other side of the connecting pipe 1 is communicated with a total pressure pipe 5, a differential pressure meter 6 is installed on the surface of the total pressure pipe 5, a device for measuring flue gas static pressure and sample gas static pressure differential pressure is arranged, one end of the total pressure pipe 5 is communicated with a measuring chamber 7 for installing a chamber for measuring particulate matters of sample gas by an instrument, a control system 8 is embedded in the top of the measuring chamber 7, the bottom of the measuring chamber 7 is communicated with an exhaust pipe 9, one end of the exhaust pipe 9 is provided with an extraction power source 10 through a flange plate, and one end of the extraction power source 10 is provided with a constant-speed adjusting device 11, the device for adjusting the gas density and ensuring the gas density at the pressure measurement point to be the same is characterized in that a static pressure pipe 12 is installed on one side of a constant-speed adjusting device 11, an air outlet 13 is formed in the bottom end of the static pressure pipe 12, a dustproof mechanism 14 and a particle monitor 15 are respectively arranged inside a measurement chamber 7, and a sealing mechanism 16 is arranged on one side of the measurement chamber 7.
Preferably, the dustproof mechanism 14 includes a frame 141, a first filter screen 142 is embedded inside the frame 141, a second filter screen 143 is sleeved inside the first filter screen 142, the diameter of the second filter screen 143 is smaller than that of the first filter screen 142, and the inside of the second filter screen 143 is not in contact with the first filter screen 142.
Preferably, the sealing mechanism 16 includes a sealing cover 161, the inside of the sealing cover 161 is symmetrically and threadedly connected with a mounting screw 162 in threaded connection with the measuring chamber 7, one side of the sealing cover 161 is bolted with a top plate 163, one side of the top plate 163 is in contact with the first filter screen 142, one side of the measuring chamber 7 is provided with a sealing groove 164, and one side of the sealing cover 161 close to the measuring chamber 7 is bonded with a sealing ring 165 clamped with the sealing groove 164.
Preferably, four sliding blocks 17 are arranged inside the measuring chamber 7, one sides of the four sliding blocks 17 close to the first filter screen 142 are all bolted to the first filter screen 142, sliding rails 18 in sliding connection with the sliding blocks 17 are symmetrically arranged inside the measuring chamber 7, and one sides of the two sliding rails 18 far away from the first filter screen 142 are all bolted to the measuring chamber 7.
Preferably, a supporting rod 19 is arranged inside the second filter screen 143, the bottom end of the supporting rod 19 is bolted to the second filter screen 143, a placing plate 20 is bolted to the top of the supporting rod 19, the bottom of the particle monitor 15 is in contact with the placing plate 20, and the placing plate 20 is L-shaped.
Preferably, a screw 21 is arranged inside the second filter screen 143, the top end of the screw 21 is bolted to the second filter screen 143, the bottom end of the screw 21 is not in contact with the particle monitor 15, and a nut 22 is connected to the surface of the screw 21 in a threaded manner.
Preferably, four supporting blocks 23 are arranged inside the frame 141, one sides of the four supporting blocks 23 far away from the second filter screen 143 are all bolted with the first filter screen 142, and one sides of the four supporting blocks 23 far away from the first filter screen 142 are all bolted with the second filter screen 143.
Preferably, the surface of the measuring chamber 7 is sprayed with a heat insulating coating 24, the front surface of the measuring chamber 7 is provided with an observation hole 25, and transparent glass 26 is embedded in the observation hole 25.
Preferably, the surface of the total pressure pipe 5 is provided with a blower 27, the output end of the blower 27 is communicated with the total pressure pipe 5, the side of the measuring chamber 7 close to the differential pressure gauge 6 is bolted with a mounting seat 28, and the side of the mounting seat 28 is bolted with the blower 27.
Preferably, a threaded pipe 30 is arranged at the bottom end of the static pressure pipe 12, the top end of the threaded pipe 30 is communicated with the static pressure pipe 12, and the inside of the threaded pipe 30 is in threaded connection with the top end of the air outlet 13.
The specific implementation mode is as follows:
most of the existing constant-speed particulate matter sampling devices adopt a dynamic pressure balance method, and constant-speed sampling is realized through dynamic balance of flow rates of sample gas and flue gas. The working principle can be summarized as follows:
t1- -measured temperature of flue
t2- -measurement temperature of measurement Chamber
S1- -measured flow velocity m/S of flue
S2- -theoretical value of flow velocity m/S required for constant-velocity sampling of sample gas at flow velocity measurement point
m1- -sectional area of sampling port of flue gas sampler
m2- -cross-sectional area of flow velocity measurement point
The control system needs to track the change of S1 according to S2 after the compensation calculation. So that the difference between the final extracted actual flow rate S and S2 is 0, i.e., S2-S is 0.
The calculation formula of the gas flow rate is formula 1
vs-flue gas flow rate, m/s; rhos- -Smoke Density, kg/m3；Ba-atmospheric pressure, Pa;
Kp-pitot tube correction factor; t is tsFlue gas temperature, deg.C; ps-flue gas static pressure, Pa;
Pd-dynamic pressure of flue gas, Pa; ms- -molar mass of flue gas, kg/kmol
Further aspects of the invention, the name interpretation:
flue gas, gas present in a flue, chimney or other duct;
a sampling port: a sampling port of the flue gas sampler;
sample gas: the smoke to be detected enters the sampling port;
gas constant velocity adjusting device: a device for adjusting the gas density and ensuring the same gas density at the pressure measurement point;
extracting a power source: the equipment for extracting the sample gas and generating extraction power can be an air pump, an extraction power source and the like;
a differential pressure gauge: a device for measuring the static pressure of the flue gas and the static pressure differential pressure of the sample gas;
a measuring chamber: and the chamber is used for installing a meter to measure the particles in the sample gas.
The working principle is as follows: firstly, a density signal of a full-pressure pipe 5 is accessed to a control system 8, the control system 8 can adjust the gas density by adjusting a gas constant-speed adjusting device 6 after obtaining a signal transmitted by the full-pressure pipe 5, so that the gas density of a sampling pipe II 29 is the same as that of the full-pressure pipe 5, the full pressure at the full-pressure pipe 5 and a static pressure signal of the sampling pipe II 29 are accessed to a differential pressure gauge 6, then the differential pressure gauge 6 can access the signal to the control system 8, the control system 8 can calculate after obtaining the signal, so as to obtain a sample gas flow rate, then the control system 8 can change an extraction power source, so as to change the flow rate V1 of the sample gas, and finally, a flue gas flow rate V2 measured by a flue gas flow rate meter 3 is tracked, so that V2-V1 is 0, thereby achieving the purpose of constant-speed sampling, and the device can balance the gas density of the flue gas in the using process, so as to ensure that the obtained flue gas density is more accurate, and the stability and reliability of the analysis data of the device during sampling are also ensured;
in the process of extracting the smoke from the power source 10, the smoke may contain a large amount of impurities, which is the smoke with impurities may enter the inside of the measuring chamber 7 through the full-pressure pipe 5, when the smoke enters the inside of the measuring chamber 7, the first filter screen 142 and the second filter screen 143 inside the measuring chamber 7 may effectively block the impurities in the smoke inside the measuring chamber 7, so that the smoke may not enter the inside of the extraction power source 10 through the exhaust pipe 9, after the sampling is completed, only the mounting screw 162 needs to be separated from the measuring chamber 7, then the sealing cover 161 is removed, and the frame 141 is then extracted from the inside of the measuring chamber 7 for cleaning, thereby achieving the purposes of filtering the impurities and facilitating the cleaning, and in the using process of the device, ash impurities in the smoke may not enter the inside of the extraction power source 10 along with the smoke, thereby effectively prolonging the service life of the extraction power source 10, and through the mode of dismantling the sealed lid 161 of measuring room 7 one side, let operating personnel use the back with the device at every turn, can both wash the impurity of measuring room 7 inside, make impurity can't pile up in the inside of measuring room 7, not only improved the inside cleanliness factor of measuring room 7, reduced operating personnel to the washing degree of difficulty of measuring room 7, impurity no longer piles up in the inside of measuring room 7 simultaneously, when also effectual having guaranteed next sample, the precision of 15 monitoring of particle monitor.
In fig. 1 and 3, hair-dryer 27 adopts miniature hair-dryer, and not only light in weight, and wind-force is bold, and operating personnel uses or carries and can not cause physical burden to operating personnel, and mutually supports between filter screen 142 and filter screen two 143, can reach the effect to impurity dual filtration, carries out the layering to impurity and filters and can guarantee that impurity can not all block up the filter screen, causes the condition that the air does not circulate to appear.
In fig. 1 and 3, the sampling pipe I2, the sampling pipe II 29, the total pressure pipe 5, the exhaust pipe 9 and the static pressure pipe 12 are all made of traditional aluminum alloy pipes, so that the sampling pipe is light and has good heat dissipation performance, after the sampling pipe I2, the sampling pipe II 29, the total pressure pipe 5, the exhaust pipe 9 and the static pressure pipe 12 are taken out from a flue, heat can be quickly dissipated, the subsequent operation of an operator is facilitated, the stability and the high temperature resistance of an aluminum alloy material are extremely high, and the deformation condition cannot occur at high temperature.
In the above-mentioned embodiment, hair-dryer 27 can effectually blow off the inside ashes of each position pipe class structure, makes ashes can not remain in the inside of device, and the pipe class structure all adopts aluminium alloy material, can effectual improvement device's portability, installation when conveniently using, also makes things convenient for accomodating and carrying in later stage simultaneously, and through double-deck filterable mode, not only can be more careful with impurity filtration, also can avoid impurity to appear the condition that the whole jam of filter screen simultaneously.
In fig. 1, the heat-insulating coating 24 is a ZS-1 heat-insulating coating, the ZS-1 heat-insulating coating can effectively store the temperature inside the measuring chamber 7, and prevent the temperature from being dissipated from the surface of the measuring chamber 7, and can also protect the control system 8 inside the measuring chamber 7, the ZS-1 heat-insulating coating can prevent the temperature inside the measuring chamber 7 from being dissipated, and can also cool the surface of the measuring chamber 7, so that the surface of the measuring chamber 7 cannot be affected by the internal temperature, and the control system 8 cannot be affected by the temperature, and the internal elements are damaged.
In fig. 1, the top ends of the mounting seat 28 and the air outlet 13 are connected in a threaded connection mode, so that the device is in a sealed state in the sampling process, the whole course of smoke is not in a condition of external contact, the quality of sampling at each time is guaranteed, and the precision of later-period detection is also guaranteed.
In the above embodiment, heat preservation coating 24 can be to operating personnel's the protection, reduces operating personnel's probability of being scalded, has also guaranteed simultaneously that 8 internal elements of control system can not receive the temperature influence to effectual control system 8's life that has prolonged, and seal the sample to the flue gas, primitive when can keeping the flue gas sample, also can guarantee simultaneously that the flue gas can not receive the outside air influence and change.
In fig. 3, the mode that adopts the screw thread installation between screw rod 21 and the nut 22 carries on spacingly to granule monitor 15, let operating personnel use the wrench, inject the inside of measuring chamber 7, contact with nut 22, can unscrew nut 22, thereby take out granule monitor 15 from the inside of measuring chamber 7, and operating personnel is when wasing frame 141, can dismantle granule monitor 15, avoid granule monitor 15 direct and water contact, lead to the inside component of granule monitor 15 can be because of the condition that appears short circuit and damage with water contact, thereby reduce granule monitor 15's life.
In the above embodiment, nut 22 and screw rod 21 are spacing with granule monitor 15, when can avoiding operating personnel mobile device, granule monitor 15 can appear with the condition of filter screen two 143 collision, thereby lead to granule monitor 15 shell to damage, increase extra cost of maintenance or replacement cost, only need rotate nut 22 simultaneously and just can dismantle granule monitor 15, great improvement the convenience of device, and can also change other monitoring devices or measuring device through dismantling and cooperate the use, the improvement the flexibility of device also to a certain extent, and dismantle granule monitor 15 and wash frame 141, then through avoiding the mode with water direct contact, the effectual life who prolongs granule monitor 15.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (1)
1. A constant-velocity sampling device for pressure measurement, comprising a connection tube (1), characterized in that: a first sampling pipe (2) and a second sampling pipe (29) are respectively installed on one side of the connecting pipe (1) through a flange plate, a flue gas velocity meter (3) is installed on the surfaces of the first sampling pipe (2) and the second sampling pipe (29), a lead pipe (4) is installed on the surface of the flue gas velocity meter (3), a full-pressure pipe (5) is communicated with the other side of the connecting pipe (1), a blower (27) is arranged on the surface of the full-pressure pipe (5), the output end of the blower (27) is communicated with the full-pressure pipe (5), a differential pressure gauge (6) is installed on the surface of the full-pressure pipe (5), a measuring chamber (7) is communicated with one end of the full-pressure pipe (5), a mounting seat (28) is bolted on one side, close to the differential pressure gauge (6), of the mounting seat (28) is bolted with the blower (27), and heat-insulating paint (24) is sprayed on the surface of the measuring chamber (7), the measuring chamber (7) is openly provided with an observation hole (25), transparent glass (26) is embedded in the observation hole (25), four sliding blocks (17) are arranged in the measuring chamber (7), one side, close to a first filter screen (142), of each sliding block (17) is bolted with the first filter screen (142), sliding rails (18) which are in sliding connection with the sliding blocks (17) are symmetrically arranged in the measuring chamber (7), one side, far away from the first filter screen (142), of each sliding rail (18) is bolted with the measuring chamber (7), a control system (8) is embedded in the top of the measuring chamber (7), the bottom of the measuring chamber (7) is communicated with an air exhaust pipe (9), one end of the air exhaust pipe (9) is provided with an extraction power source (10) through a flange plate, one end of the extraction power source (10) is provided with a constant-speed adjusting device (11), one side of the constant-speed adjusting device (11) is provided with a static-pressure pipe (12), the bottom of static pressure pipe (12) is equipped with threaded pipe (30), the top and static pressure pipe (12) intercommunication of threaded pipe (30), the inside of threaded pipe (30) and the top threaded connection of gas outlet (13), the bottom of static pressure pipe (12) is equipped with the gas outlet, the inside of measuring chamber (7) is equipped with dustproof mechanism (14) and granule monitor (15) respectively, dustproof mechanism (14) includes frame (141), the inside of frame (141) is equipped with four supporting shoes (23), four one side that filter screen two (143) were kept away from to supporting shoe (23) all is bolted with filter screen one (142), four one side that filter screen one (142) were kept away from to supporting shoe (23) all is bolted with filter screen two (143), frame (141) inside is embedded to have filter screen one (142), the inside cover of filter screen one (142) is equipped with filter screen two (143), the inside of filter screen two (143) is equipped with branch (19), the bottom and the filter screen two (143) bolt of branch (19), the top bolt of branch (19) has placed board (20), the bottom of granule monitor (15) with place board (20) contact, the shape of placing board (20) is L shape, the diameter of filter screen two (143) is less than filter screen one (142), the inside of filter screen two (143) is equipped with screw rod (21), the top and the filter screen two (143) bolt of screw rod (21), the bottom of screw rod (21) does not contact with granule monitor (15), the surface threaded connection of screw rod (21) has nut (22), the inside of filter screen two (143) does not contact with filter screen one (142), one side of measuring chamber (7) is equipped with sealing mechanism (16), sealing mechanism (16) includes sealed lid (161), the inside symmetry threaded connection of sealed lid (161) has installation screw (162) with measurement room (7) threaded connection, one side bolt joint of sealed lid (161) has roof (163), one side and the filter screen (142) contact of roof (163), seal groove (164) have been seted up to one side of measurement room (7), sealed lid (161) are close to one side bonding of measurement room (7) have with sealing washer (165) of seal groove (164) joint.
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| CN114062059B (en) * | 2021-11-22 | 2022-12-23 | 南京波瑞自动化科技有限公司 | Flue gas collecting and measuring system with non-uniform velocity field compensation |
| CN114739758B (en) * | 2022-06-10 | 2022-08-23 | 南京波瑞自动化科技有限公司 | Speed-adjustable sampling device of static pressure balance method |
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