CN110658355A - Pipeline air flow velocity measuring device - Google Patents
Pipeline air flow velocity measuring device Download PDFInfo
- Publication number
- CN110658355A CN110658355A CN201911061839.5A CN201911061839A CN110658355A CN 110658355 A CN110658355 A CN 110658355A CN 201911061839 A CN201911061839 A CN 201911061839A CN 110658355 A CN110658355 A CN 110658355A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- rotating shaft
- measuring
- flow
- resistance sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims description 16
- 230000000903 blocking effect Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 8
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000000843 powder Substances 0.000 description 42
- 239000003245 coal Substances 0.000 description 28
- 238000009434 installation Methods 0.000 description 15
- 239000000203 mixture Substances 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 240000004282 Grewia occidentalis Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/02—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer
- G01P5/06—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer using rotation of vanes
Landscapes
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to the technical field of wind speed measurement, and discloses a pipeline airflow flow velocity measuring device which comprises a rotating shaft, wherein the rotating shaft can rotate relative to a flow velocity pipeline to be measured, and a resistance sheet connected to the rotating shaft is arranged in the flow velocity pipeline to be measured; and the detection sensor is used for measuring the deflection angle of the resistance sheet relative to the initial position or measuring the acting force for driving the resistance sheet to rotate. The invention calculates the flow velocity of the air flow by monitoring the deflection angle of the resistance sheet or the rotating acting force of the driving resistance sheet in real time, and has simple structure, high measurement sensitivity and high accuracy.
Description
Technical Field
The invention relates to the technical field of wind speed measurement, in particular to a pipeline airflow velocity measuring device.
Background
The boiler is an energy conversion device for converting heat energy generated by coal burning into steam kinetic energy, and is also an important production device of power generation enterprises, and the safety and the economy of a coal burning power plant are directly influenced by whether the boiler can stably and efficiently operate. The primary air powder pipe is connected with a burner of the boiler, whether the speed of the primary air powder mixture in the primary air powder pipe can accurately and timely detect that the speed of the primary air powder mixture directly influences the combustion condition of the boiler, and particularly, if the primary air speed difference of each layer of corner jet is large and the primary air speed difference is not uniform, the large-scale coal-fired boiler adopting the multi-layer four-corner direct-current jet tangential firing technology can cause the central deviation of the flame of a hearth, the adherence of the flame, the non-uniform thermal load of the hearth, the large temperature deviationXThe problems of increased discharge, over-temperature of the water-cooled wall, coking of the water-cooled wall and the like, so that the accurate monitoring of the primary wind speed is very important for the safe and economic operation of the boiler.
At present, a primary air wind speed measuring device of a coal-fired unit of a coal-fired power plant generally adopts a pitot tube principle, and a sample of the measuring device is a primary air-powder mixture. As the primary air dries the raw coal in the coal mill, most of the moisture in the raw coal is evaporated into the primary air flow, so that the humidity of the primary air becomes high. When the primary air-powder mixture enters the sampling tube with lower temperature, water vapor in the primary air meets condensation to cause coal powder in the sampling tube to agglomerate and block the sampling tube, thereby influencing the accurate measurement of the primary air speed.
Disclosure of Invention
The invention aims to provide a pipeline airflow velocity measuring device which can solve the problem that the accuracy of wind speed measurement is influenced by blocking a sampling pipe due to coal dust in the sampling pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a pipeline airflow velocity measurement device, comprising:
the rotating shaft can rotate relative to the flow velocity pipeline to be detected, and a resistance sheet connected to the rotating shaft is arranged in the flow velocity pipeline to be detected;
and the detection sensor is used for measuring the deflection angle of the resistance sheet relative to the initial position or measuring the acting force for driving the resistance sheet to rotate.
As a preferable technical solution of the above device for measuring a flow rate of a duct airflow, the device further includes:
the rapping drive is used for driving the rotating shaft to rotate;
and the driving end of the clutch is connected to the output shaft of the rapping drive, and the driven end of the clutch is connected to the rotating shaft.
As an optimal technical scheme of the pipeline airflow velocity measuring device, the pipeline airflow velocity measuring device further comprises an installation protective sleeve arranged outside the to-be-measured velocity pipeline, the rapping drive and the clutch are arranged in the installation protective sleeve, and the driven end of the clutch is rotatably connected to the inner wall of the installation protective sleeve.
As a preferred technical solution of the above device for measuring the flow velocity of the air flow in the pipeline, a through hole is provided in the pipeline for measuring the flow velocity, one end of the rotating shaft passes through the through hole and is connected to the passive end of the clutch, and a gap is reserved between the inner wall of the through hole and the outer wall of the rotating shaft;
the pipeline airflow and flow velocity measuring device further comprises an air sealing assembly used for inflating the pipeline to be measured through the gap so that the gap forms air sealing.
As an optimal technical scheme of the pipeline airflow velocity measuring device, the pipeline airflow velocity measuring device further comprises a blocking plate which is arranged in the velocity pipeline to be measured and arranged on the rotating shaft and used for changing the flow direction of gas entering the velocity pipeline to be measured through the gap.
As a preferable technical scheme of the pipeline airflow velocity measuring device, one side of the clutch, which is back to the rapping drive, is provided with a dustproof sheet, and one end of the rotating shaft, which extends out of the pipeline with the velocity to be measured, penetrates through the dustproof sheet and is connected to the passive end of the clutch.
As an optimal technical solution of the above device for measuring the flow velocity of the air flow in the duct, the maximum distance between the resistance strip and the central axis of the rotating shaft along the direction perpendicular to the rotating shaft is greater than or equal to the maximum distance between the central axis of the rotating shaft along the direction perpendicular to the central axis of the rotating shaft and the inner wall of the duct at which the flow velocity is to be measured.
As a preferable technical solution of the above device for measuring the flow velocity of the air flow in the duct, the circumferential edge of the resistance sheet is in a wave shape.
As a preferred technical scheme of the pipeline airflow velocity measuring device, the resistance sheet is provided with an air hole.
As a preferable technical scheme of the above device for measuring the flow velocity of the pipeline airflow, an anti-abrasion layer is arranged on the outer wall of the resistance sheet and/or the outer wall of the rotating shaft.
The invention has the beneficial effects that: the invention calculates the flow velocity of the air flow by monitoring the deflection angle of the resistance sheet or the rotating acting force of the driving resistance sheet in real time, and has simple structure, high measurement sensitivity and high accuracy.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a device for measuring the flow rate of a pipeline gas flow according to an embodiment of the present invention;
FIG. 2 is a schematic view of a partial structure of a device for measuring the flow rate of a pipeline airflow provided by an embodiment of the present invention;
FIG. 3 is a radial cross-sectional view of the blocking plate, spindle and second mounting sleeve in combination according to an embodiment of the present invention.
In the figure:
1. vibration driving; 2. a bearing; 3. a first mounting sleeve; 4. a second mounting sleeve; 5. a rotating shaft; 6. a flow velocity pipeline to be measured; 7. a resistance sheet; 8. installing a protective sleeve; 9. a dust-proof sheet; 10. an angle sensor; 11. a blocking plate; 12. a gap.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
As shown in fig. 1 and fig. 2, the present embodiment provides a pipeline airflow velocity of flow measuring device, including pivot 5, resistance piece 7 and detection sensor, wherein, pivot 5 can rotate for the velocity of flow pipeline 6 that awaits measuring, and resistance piece 7 is located in the velocity of flow pipeline 6 that awaits measuring, and resistance piece 7 is connected in pivot 5. The detection sensor employs an angle sensor 10 for measuring a deflection angle of the resistive sheet 7 with respect to an initial position. In this embodiment, one resistance piece 7 is provided.
In this embodiment, flow velocity pipeline 6 that awaits measuring is the buggy pipeline of horizontal setting, adopt wind to carry the buggy to form the buggy mixture in order to carry the buggy usually, have under the state of buggy circulation in the buggy pipeline, the wind powder air current that wind and buggy formed has kinetic energy, resistance piece 7 will rotate certain angle to the direction of flow under the drive effect of wind powder air current, and there is the one-to-one relation between the velocity of flow of deflection angle and wind powder air current for initial position of resistance piece 7, consequently can calculate the velocity of flow of wind powder air current through the deflection angle of real-time supervision resistance piece 7.
When adopting above-mentioned pipeline air current velocity of flow measuring device to measure the wind speed in this buggy pipeline, when there is not the buggy circulation, resistance piece 7 is in vertical state and is located the below of pivot 5 under self action of gravity, and resistance piece 7's initial position promptly, and resistance piece 7 is zero for the corner of initial position this moment.
The flow velocity pipeline 6 to be measured is not limited to a horizontally arranged pulverized coal pipeline, but also can be a vertically arranged pulverized coal pipeline. It should be noted that, in the case of being applied to a coal powder pipeline which is vertically arranged, when no coal powder flows through the coal powder pipeline, the resistance sheet 7 is in a horizontal state, and therefore, a support sheet is required to be arranged to support the resistance sheet 7 to be in a horizontal state.
The pipeline air flow velocity of flow measuring device that this embodiment provided not only can be applied to the velocity of flow that measures the wind powder air current when adopting the primary air to carry buggy, can also measure the velocity of flow of overgrate air, or the air flow velocity in other pipelines.
When being applied to the flow velocity measurement of the wind-powder airflow, the pipeline airflow flow velocity measurement device can bond coal powder on the resistance sheet 7 after being used for a long time, and then the measurement accuracy is influenced. For this purpose, the present embodiment is additionally provided with a rapping drive 1 and a clutch to periodically clean the drag strips 7 of coal dust adhering thereto.
Specifically, the driving end of the clutch is connected to the output shaft of the rapping drive 1, the driven end of the clutch is connected to the rotating shaft 5, and the rotating shaft 5 is driven to rotate by the rapping drive 1. When the pulverized coal on the resistance sheet 7 needs to be cleared, the clutch is closed, the rapping drive 1 drives the rotating shaft 5 to rotate, the resistance sheet 7 rotates along with the rotating shaft 5, and the pulverized coal on the surface of the resistance sheet 7 driven to rotate by the rapping drive 1 is flushed along with the air-powder airflow. When the rapping drive 1 does not work, the clutch is disconnected to ensure that the rotating shaft 5 can normally rotate, so as to monitor the flow rate of the wind-powder airflow in the flow rate pipeline 6 to be measured in real time.
Further, in order to improve the pulverized coal cleaning effect on the resistance sheet 7, the maximum distance between the resistance sheet 7 and the central axis of the rotating shaft 5 along the direction perpendicular to the rotating shaft 5 is greater than or equal to the maximum distance between the central axis of the rotating shaft 5 and the inner wall of the flow velocity pipeline 6 to be measured along the direction perpendicular to the central axis. In the rotating process of the resistance sheet 7, the resistance sheet 7 collides with the inner wall of the flow velocity pipeline 6 to be measured, and the attached coal powder on the resistance sheet 7 is removed in a vibration mode.
In order to avoid resistance piece 7 by rapping drive 1 and force to drive resistance piece 7 and rotate and to damaging the problem of the velocity of flow pipeline 6 that awaits measuring, through rapping drive 1 control resistance piece 7 and carry out the forward and reverse rotation of frequent switching-over, make resistance piece 7 reverse after 7 rotates certain angle promptly and the velocity of flow pipeline 6 that awaits measuring bumps the back to make resistance piece 7 reverse after 7 collides with the velocity of flow pipeline 6 inner wall that awaits measuring once more at resistance piece. Through the multiple collision of resistance piece 7 and the flow velocity pipeline 6 inner wall that awaits measuring, the vibration of resistance piece 7 further clears away the buggy that adheres on it during the utilization collision.
In this embodiment, the rapping drive 1 is a motor, and the operating frequency of the motor can be adjusted according to actual requirements. In other embodiments, the motor may be replaced by a vibrator, and the vibrator is used to drive the rotating shaft 5 to drive the resistance strip 7 to vibrate, so as to remove the coal dust on the resistance strip 7 in a vibrating manner.
Further, in order to avoid the influence of the pulverized coal on the operation of the motor and the clutch, the motor and the clutch are both arranged outside the flow velocity pipeline 6 to be measured. Be applied to the velocity of flow of measuring wind powder air current or the velocity of flow of overgrate air waiting with above-mentioned pipeline air current velocity of flow measuring device, the environment that the velocity of flow pipeline 6 that awaits measuring exists is comparatively abominable, has add installation protective sheath 8 for this embodiment, all locates in installation protective sheath 8 motor and clutch, and the passive end rotation of clutch is connected in the inner wall of installation protective sheath 8.
Specifically, two installation protection sleeves 8 are arranged, a bearing 2 is respectively installed in each installation protection sleeve 8, two through holes located on the same horizontal plane are formed in the flow rate pipeline 6 to be measured, and one end of the rotating shaft 5 penetrates through one through hole, rotatably penetrates through one bearing 2 and is connected to the driven end of the clutch; the other end of the rotating shaft 5 passes through the other through hole and is rotatably connected to the other bearing 2, and the two mounting protective sleeves 8 are used for supporting the rotating shaft 5. Preferably, the angle sensor 10 is mounted in the mounting protective sleeve 8 without a motor and is located at the end of the rotating shaft 5. Preferably, the bearing 2 is a rolling bearing.
In other embodiments, one end of the rotating shaft 5 can also be suspended, and the other end of the rotating shaft extends out of the inner wall of the flow velocity pipeline 6 to be measured and is connected to the passive end of the clutch, and the supporting capability of the rotating shaft 5 is relatively poor when the structure is adopted; one end of the rotating shaft 5 can be rotatably connected to the flow velocity pipeline 6 to be measured, a bearing is arranged between the rotating shaft 5 and the inner wall of the flow velocity pipeline 6 to be measured, the other end of the rotating shaft extends out of the inner wall of the flow velocity pipeline 6 to be measured and is connected to the passive end of the clutch, and the bearing is extremely easy to block by coal powder when the structure is adopted, so that the rotating shaft 5 cannot normally rotate.
In order to avoid abrasion of the inner wall of the through hole in the rotating process of the rotating shaft 5, a gap 12 is reserved between the inner wall of the through hole and the outer wall of the rotating shaft 5. However, the gap 12 is easily blocked by the pulverized coal to affect the normal rotation of the rotating shaft 5, or the pulverized coal airflow flows into the mounting protective sleeve 8 through the gap 12 to cause the powder accumulation and the jamming of the bearing 2 and the angle sensor 10. In the embodiment, an air sealing component is additionally arranged and used for inflating the flow rate pipeline 6 to be measured through the gap 12 so as to enable the gap 12 to form air sealing.
Specifically, the air-tightness assembly comprises an air pump, a first mounting sleeve 3 and a second mounting sleeve 4, wherein the air pump is arranged outside the mounting protective sleeve 8, an outlet of the air pump is connected to one end of the first mounting sleeve 3, and the other end of the first mounting sleeve 3 extends into the mounting protective sleeve 8. The second installation sleeve 4 runs through the through hole, the one end of the second installation sleeve 4 extending out of the flow velocity pipeline 6 to be tested is communicated with the first installation sleeve 3, and the gap 12 is formed between the second installation sleeve 4 and the rotating shaft 5. The air pump is used for continuously inflating the pipeline 6 with the flow speed to be measured through the first mounting sleeve 3 and the gap 12 so as to prevent the wind-powder airflow in the pipeline 6 with the flow speed to be measured from entering the gap 12, the air sealing of the gap 12 is realized, and the sealing cost is reduced. In other embodiments, an air compressor may be used in place of the air pump.
In this embodiment, the size of the resistance sheet 7, the size and the mass of the rotating shaft 5, and the radial distance of the gap 12 along the second mounting sleeve 4 are limited, so that it is ensured that the air delivered by the air pump does not affect the air-powder airflow field in the flow rate pipeline 6 to be measured, and the accuracy of measurement is ensured. Taking a 300MW boiler as an example, under full load, the air quantity sent into the pipeline 6 with the flow velocity to be measured through the gap 12 accounts for about one thousandth of the proportion of primary air, and the influence on combustion can be ignored; and the cross-sectional area of the resistance sheet 7 only accounts for about 5% of the cross-sectional area of the flow velocity pipeline 6 to be measured, the resistance is small, and the influence on the reduction of the pulverizing resistance caused by the increase of the wind resistance of the pipeline can be ignored.
In other embodiments, the air pump may directly inflate the installation protection sleeve 8, and the air in the installation protection sleeve 8 enters the flow-rate pipe 6 to be measured through the slit 12.
Further, in order to prevent the pulverized coal from entering the gap 12, the blocking plate 11 is further added in this embodiment to change the flow direction of the gas entering the flow rate pipe 6 to be measured through the gap 12. Specifically, the blocking plate 11 is disposed in the flow rate pipe 6 to be measured and on the rotating shaft 5. Preferably, one end of the second mounting sleeve 4 extends into the flow velocity pipeline 6 to be measured, the blocking plate 11 and the second mounting sleeve 4 are arranged in a one-to-one correspondence manner, a gap is formed between the axial end face, facing the blocking plate 11, of the second mounting sleeve 4 and the blocking plate 11, and air between the second mounting sleeve 4 and the rotating shaft 5 diffuses towards the periphery of the rotating shaft 5 through the gap between the axial end face, facing the blocking plate 11, of the second mounting sleeve 4 and the blocking plate 11.
Furthermore, a dustproof sheet 7 is arranged on one side of the clutch back to the rapping drive 1, and one end of the rotating shaft 5, which extends out of the flow rate pipeline 6 to be measured, penetrates through the dustproof sheet 7 and is connected with the driven end of the clutch. The dust-proof sheet 7 prevents the pulverized coal airflow from flowing to the periphery of the clutch, so that the bearing 2 between the driven end of the clutch and the inner wall of the mounting protective sleeve 8 cannot work normally.
Further, the circumferential edge of the resistance piece 7 is formed in a wave shape, and by the above-described limitation of the structure of the resistance piece 7, the eddy current disturbance caused by the installation of the resistance piece 7 can be reduced, and the amount of the pulverized coal accumulated on the surface of the resistance piece 7 can be reduced.
Furthermore, the outer wall of the resistance sheet 7 and the outer wall of the rotating shaft 5 are both provided with an anti-abrasion layer. The service life of the rotating shaft 5 and the resistance sheet 7 can be prolonged by arranging the anti-abrasion layer.
In this embodiment, the resistance strip 7 is a disc structure, preferably, the rotating shaft 5 is disposed near an average value of radial velocity distribution of the airflow, one end of the resistance strip 7 is connected to the rotating shaft 5 and symmetrically disposed about the flow velocity pipeline 6 to be measured, and specific positions of the rotating shaft 5 and the resistance strip 7 on the rotating shaft 5 can be determined through multiple tests. In other embodiments, the resistance sheet 7 may be a rectangular plate, a square plate, an oval plate or other special-shaped structures, and the accuracy of measurement is not affected regardless of the shape of the resistance sheet 7. In other embodiments, the position of the resistance sheet 7 relative to the flow velocity pipeline 6 to be measured may be set at the central position of the flow velocity pipeline 6 to be measured or at a position close to the inner wall of the flow velocity pipeline 6 to be measured, and the measurement of the flow velocity to be measured is not affected no matter how the position of the resistance sheet 7 changes.
In this embodiment, only one of the flaps 7 is provided, and how to calculate the flow rate of the wind-powder airflow using the deflection angle of the flap 7 with respect to the initial position, which is measured by the angle sensor 10, will be described below.
Assuming that the airflow speed of the pulverized coal in a horizontal straight pipe section (the vertical section can also be measured) is upsilon, the airflow density of the pulverized coal is ρ, the coal amount provided by the coal mill is b, the ventilation amount provided by the coal mill is a, and the temperature of mixed air is t2Mixed wind pressure of p1Standard atmospheric pressure p0The local atmospheric pressure is p and the primary air temperature is t1Radius of the resistance sheet 7 is r, deflection angle of the resistance sheet 7 relative to the initial position is theta, mass of the resistance sheet 7 is m, airflow differential pressure deltap and coefficient k.
The magnitude of the force F of the wind-powder airflow acting on the resistance sheet 7 is mg tan theta and S delta p cos theta, and the area S of the resistance sheet 7 is pi·r2Velocity of the wind-powder air flowFrom the above formula, one can derive:
the density of the wind powder airflow is obtained by calculating according to the relationship among the weight, the volume and the density of the wind powder airflow and correcting through the temperature, and the accuracy of the density of the wind powder airflow obtained through calculation can be improved through a temperature correction mode, so that the accuracy of the flow speed of the wind powder airflow is improved. The temperature mainly affects the volume of the fluid, and how to correct the volume of the fluid by the temperature is the prior art and is not described in detail herein. Density of the air flow of the air powder:
the following can be obtained from the above equations (a) and (b):
the coefficient k in the formula (c) is a constant and is a known value. Referring to the above formula (c), the flow velocity of the wind-powder airflow and the deflection angle of the resistance sheet 7 relative to the initial position are in a linear positive correlation, which is shown in detail in fig. 3. The calculation of the above formula (b) is prior art and will not be described herein in detail. By using
The device for measuring the flow speed of the air flow in the pipeline further comprises a display component, such as a display and the like, and the display component is used for displaying the calculated flow speed of the air flow. In order to avoid the problem that the flow speed of the wind-powder airflow displayed by the display frequently jumps, the display displays the average value of the flow speed of the wind-powder airflow within each interval of preset time.
After the position of the resistance sheet 7 is changed, although the flow velocity of the wind-powder airflow in the flow velocity pipeline 6 to be measured is not affected, the measurement accuracy is affected, so that the coefficient k needs to be corrected or calibrated according to actual conditions.
Example two
The difference between this embodiment and the first embodiment is that the air holes are formed on the resistance sheet 7. The setting of the air holes can change the sensitivity and the measuring range of measurement, so that whether the air holes need to be set and the number of the air holes can be determined according to the approximate range of the air flow speed in the actual flow speed pipeline 6 to be measured.
EXAMPLE III
The present embodiment is different from the first embodiment in that the detection sensor is a load cell for measuring the force for driving the resistance strip 7 to rotate.
Specifically, the force cell sensor is located between the inner circle of resistance piece 7 and bearing 2, and the effort of drive resistance piece 7 pivoted power between the inner circle of resistance piece 7 and bearing 2 is the one-to-one, and resistance piece 7 rotates certain angle to the direction of flow under the drive effect of wind powder air current, and there is the one-to-one relation between the velocity of flow of drive resistance piece 7 rotation effort and wind powder air current, consequently can calculate the velocity of flow of wind powder air current through real-time supervision drive resistance piece 7 pivoted effort.
Example four
In the case where the flow velocity of the wind-powder air flow is large, it is found through continuous experiments that when the deflection angle of the resistance flap 7 with respect to the initial position is generally larger than 70 °, even if the flow velocity of the wind-powder air flow continues to increase, the change of the deflection angle of the resistance flap 7 with respect to the initial position will be small, and at this time, the sensitivity will be seriously lowered. Therefore, the above-mentioned resistance pieces 7 may be provided in two or more, at least two resistance pieces 7 being distributed along the circumferential direction of the rotating shaft 5.
In order to avoid that the rotating shaft 5 rotates within a range of 360 degrees when the plurality of resistance plates 7 are arranged to influence the measurement of the deflection angle of the resistance plates relative to the initial position, the maximum included angle between the plurality of resistance plates 7 is required to be less than or equal to 90 degrees. The number of the resistance sheets 7 can be determined according to the approximate range of the airflow speed in the actual flow velocity pipeline 6 to be measured.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. A device for measuring the flow rate of a pipeline gas flow, comprising:
the rotating shaft (5) can rotate relative to the flow velocity pipeline (6) to be detected, and a resistance sheet (7) connected to the rotating shaft (5) is arranged in the flow velocity pipeline (6) to be detected;
the detection sensor is used for measuring the deflection angle of the resistance sheet (7) relative to the initial position or measuring the acting force for driving the resistance sheet (7) to rotate.
2. The duct air flow rate measurement device of claim 1, further comprising:
the rapping driver (1) is used for driving the rotating shaft (5) to rotate;
and the driving end of the clutch is connected to the output shaft of the rapping drive (1), and the driven end of the clutch is connected to the rotating shaft (5).
3. The device for measuring the flow rate of air flowing through a pipeline according to claim 2, further comprising a mounting protective sleeve (8) disposed outside the pipeline (6) to be measured, wherein the rapping driver (1) and the clutch are both disposed inside the mounting protective sleeve (8), and the driven end of the clutch is rotatably connected to the inner wall of the mounting protective sleeve (8).
4. The device for measuring the airflow rate of the pipeline according to claim 3, wherein a through hole is formed in the pipeline (6) to be measured, one end of the rotating shaft (5) penetrates through the through hole and is connected to the driven end of the clutch, and a gap (12) is reserved between the inner wall of the through hole and the outer wall of the rotating shaft (5);
the pipeline airflow and flow velocity measuring device further comprises an air sealing assembly used for inflating the pipeline (6) to be measured through the gap (12) so as to enable the gap (12) to form air sealing.
5. The device for measuring the flow rate of the gas flowing through the pipeline according to claim 4, further comprising a blocking plate (11) arranged in the pipeline (6) with the flow rate to be measured and arranged on the rotating shaft (5) and used for changing the flow direction of the gas entering the pipeline (6) with the flow rate to be measured through the gap (12).
6. The device for measuring the flow rate of a gas flow through a pipeline as claimed in claim 2, wherein a dust-proof plate (7) is provided on the side of said clutch facing away from said rapping drive (1), and wherein the end of said rotating shaft (5) extending out of said pipeline (6) at which the flow rate is to be measured passes through said dust-proof plate (7) and is connected to the passive end of said clutch.
7. The device for measuring the pipe airflow speed according to claim 1, wherein the maximum distance between the resistance sheet (7) and the central axis of the rotating shaft (5) along the direction perpendicular to the rotating shaft (5) is greater than or equal to the maximum distance between the central axis of the rotating shaft (5) and the inner wall of the pipe (6) for measuring the flow speed along the direction perpendicular to the central axis of the rotating shaft.
8. The ducted air flow velocity measurement apparatus according to claim 1, wherein the circumferential edge of the resistance sheet (7) is wave-shaped.
9. The device for measuring the flow rate of the air flow in the pipeline is characterized in that the resistance sheet (7) is provided with air holes.
10. The pipeline gas flow velocity measuring device according to claim 1, wherein the outer wall of the resistance sheet (7) and/or the outer wall of the rotating shaft (5) is provided with an anti-wear layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911061839.5A CN110658355A (en) | 2019-11-01 | 2019-11-01 | Pipeline air flow velocity measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911061839.5A CN110658355A (en) | 2019-11-01 | 2019-11-01 | Pipeline air flow velocity measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110658355A true CN110658355A (en) | 2020-01-07 |
Family
ID=69042751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911061839.5A Pending CN110658355A (en) | 2019-11-01 | 2019-11-01 | Pipeline air flow velocity measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110658355A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557696A (en) * | 2020-12-08 | 2021-03-26 | 中国人民解放军海军工程大学 | Pneumatic piston type micro-flow speed measuring device and method thereof |
| CN112964894A (en) * | 2021-02-03 | 2021-06-15 | 青岛科技大学 | Water vapor simulation generator for gas field distribution measurement experiment |
| CN113042367A (en) * | 2021-05-13 | 2021-06-29 | 浙江大学 | Agricultural machine and cleaning sieve blockage dredging method thereof |
| CN113262978A (en) * | 2021-05-13 | 2021-08-17 | 浙江大学 | Cleaning sieve blocks up monitoring devices and cleaning plant for agricultural machine |
| CN117214461A (en) * | 2023-08-31 | 2023-12-12 | 江苏微之润智能技术有限公司 | Suspension wing type flow velocity meter calibration method based on fusion algorithm |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11287686A (en) * | 1998-04-02 | 1999-10-19 | Mitsubishi Electric Corp | Flow measuring device |
| CN101576567A (en) * | 2009-06-24 | 2009-11-11 | 中国铝业股份有限公司 | Flow velocity measurement method for high temperature melt |
| CN203502057U (en) * | 2013-10-16 | 2014-03-26 | 上海世昕软件开发有限公司 | Deflection angle flow meter |
| CN105043462A (en) * | 2015-07-06 | 2015-11-11 | 中国科学院力学研究所 | Method for measuring gas flow of large-diameter pipe |
| CN105508632A (en) * | 2016-01-18 | 2016-04-20 | 株洲南方阀门股份有限公司 | Flow speed detecting mechanism and pipe explosion emergency cut-off valve thereof |
| TW201704721A (en) * | 2015-06-19 | 2017-02-01 | 東京威力科創股份有限公司 | Flow rate measurement device and processing device |
| CN206009004U (en) * | 2016-08-29 | 2017-03-15 | 柳州钢铁股份有限公司 | Converter electric precipitator airflow-distribution board ash removal equipment for flapping |
| CN210720456U (en) * | 2019-11-01 | 2020-06-09 | 烟台龙源电力技术股份有限公司 | Pipeline air flow velocity measuring device |
-
2019
- 2019-11-01 CN CN201911061839.5A patent/CN110658355A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11287686A (en) * | 1998-04-02 | 1999-10-19 | Mitsubishi Electric Corp | Flow measuring device |
| CN101576567A (en) * | 2009-06-24 | 2009-11-11 | 中国铝业股份有限公司 | Flow velocity measurement method for high temperature melt |
| CN203502057U (en) * | 2013-10-16 | 2014-03-26 | 上海世昕软件开发有限公司 | Deflection angle flow meter |
| TW201704721A (en) * | 2015-06-19 | 2017-02-01 | 東京威力科創股份有限公司 | Flow rate measurement device and processing device |
| CN105043462A (en) * | 2015-07-06 | 2015-11-11 | 中国科学院力学研究所 | Method for measuring gas flow of large-diameter pipe |
| CN105508632A (en) * | 2016-01-18 | 2016-04-20 | 株洲南方阀门股份有限公司 | Flow speed detecting mechanism and pipe explosion emergency cut-off valve thereof |
| CN206009004U (en) * | 2016-08-29 | 2017-03-15 | 柳州钢铁股份有限公司 | Converter electric precipitator airflow-distribution board ash removal equipment for flapping |
| CN210720456U (en) * | 2019-11-01 | 2020-06-09 | 烟台龙源电力技术股份有限公司 | Pipeline air flow velocity measuring device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557696A (en) * | 2020-12-08 | 2021-03-26 | 中国人民解放军海军工程大学 | Pneumatic piston type micro-flow speed measuring device and method thereof |
| CN112557696B (en) * | 2020-12-08 | 2022-09-06 | 中国人民解放军海军工程大学 | Pneumatic piston type micro-flow speed measuring device and method thereof |
| CN112964894A (en) * | 2021-02-03 | 2021-06-15 | 青岛科技大学 | Water vapor simulation generator for gas field distribution measurement experiment |
| CN113042367A (en) * | 2021-05-13 | 2021-06-29 | 浙江大学 | Agricultural machine and cleaning sieve blockage dredging method thereof |
| CN113262978A (en) * | 2021-05-13 | 2021-08-17 | 浙江大学 | Cleaning sieve blocks up monitoring devices and cleaning plant for agricultural machine |
| CN117214461A (en) * | 2023-08-31 | 2023-12-12 | 江苏微之润智能技术有限公司 | Suspension wing type flow velocity meter calibration method based on fusion algorithm |
| CN117214461B (en) * | 2023-08-31 | 2024-04-09 | 江苏微之润智能技术有限公司 | Suspension wing type flow velocity meter calibration method based on fusion algorithm |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110658355A (en) | Pipeline air flow velocity measuring device | |
| CN109707659B (en) | Online performance monitoring system for fan | |
| CN210720456U (en) | Pipeline air flow velocity measuring device | |
| CN202126281U (en) | Anti-clogging pressure equalizing air flow measuring device | |
| CN105865542A (en) | Integrated measuring device and method for smoke flow and pollutants | |
| US20170322059A1 (en) | Low pressure drop and high temperature flow measuring device | |
| CN201028572Y (en) | Primary air powder on-line monitoring system | |
| CN201032160Y (en) | Boiler wind powder online monitoring device | |
| CN111306689B (en) | Underground ventilation system | |
| CN110118345B (en) | Flue gas diversion system and method and waste heat boiler | |
| CN219736455U (en) | Visual wedge flowmeter | |
| CN205719059U (en) | A kind of chimneying flow measurement device | |
| CN105652031A (en) | Air conditioner pipeline flow velocity monitor | |
| CN202066533U (en) | Online fan flow detection device of uniform celerity tube | |
| CN213364111U (en) | Wind pressure measuring device | |
| CN207007253U (en) | A kind of equal pressure chamber, the pipeline comprising it and include its wind and smoke flow measurement device | |
| CN111624010A (en) | Operation detection method, system and device for blockage of air preheater | |
| JPS63134022A (en) | Determination method for clogging of bag filter | |
| CN111609889A (en) | Pressure, temperature and flow monitor | |
| CN216925681U (en) | Gas ultrasonic flowmeter with filtering function | |
| CN105424974A (en) | Air conditioner pipeline flow velocity monitor | |
| CN219266330U (en) | Corrosion-resistant Gao Wenpi support tube | |
| CN218156644U (en) | Pulverized coal furnace draught fan outlet pressure measuring device | |
| CN221148717U (en) | Cyclone burner secondary air measuring device and cyclone burner | |
| CN215109711U (en) | Dynamic balance self-adjusting system for wind wheel of fan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |