CN111551218A - Pitot tube flow measuring instrument - Google Patents
Pitot tube flow measuring instrument Download PDFInfo
- Publication number
- CN111551218A CN111551218A CN202010420977.4A CN202010420977A CN111551218A CN 111551218 A CN111551218 A CN 111551218A CN 202010420977 A CN202010420977 A CN 202010420977A CN 111551218 A CN111551218 A CN 111551218A
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- pipe
- tube
- fluid
- wall
- pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/46—Pitot tubes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
Abstract
The invention provides a pitot tube flow measuring instrument, wherein an inner tube fluid collecting port is arranged on the tube wall at the lower end of an inner tube, and the outer tube and a middle tube are both hollow tube structures with openings at the upper end and the lower end; the upper end of the inner pipe is inserted into the lower end of the middle pipe to form a telescopic sleeve structure, the upper end of the middle pipe is inserted into the lower end of the outer pipe to form a telescopic sleeve structure, a middle pipe fluid collecting port is formed in the pipe wall of the lower end of the middle pipe, and an outer pipe fluid collecting port is formed in the pipe wall of the lower end of the outer pipe; the static pressure collection pipe is arranged on the outer wall of the outer pipe, and is directly communicated with the first pressure guide pipe; the buffer cavity is communicated with the upper end of the outer pipe and is also communicated with the second pressure pipe; the differential pressure transmitter is characterized by further comprising a differential pressure transmitter and a flow integrating instrument, wherein two flow interfaces of the differential pressure transmitter are respectively communicated with the first pressure guide pipe and the second pressure guide pipe. The invention has the advantage of more accurate measurement.
Description
Technical Field
The invention relates to the technical field of fluid measurement, in particular to a pitot tube flow measuring instrument.
Background
For the flow measurement of the fluid in the pipeline, a pitot tube is generally used for measuring the total pressure and the static pressure of the fluid in the pipeline, and the flow rate of the fluid in the pipeline is obtained by calculating the difference value of the total pressure and the static pressure, so as to obtain the flow value of the fluid, such as an authorized publication number CN209992027U and a name of a plug-in pitot tube flowmeter. However, because the flow of the fluid in the pipe is very complicated, a boundary layer is formed on the pipe wall, the velocity distribution curve of the fluid in the pipe is shown in fig. 1, the fluid flows in the fluid pipe 17, the velocity is close to 0 at the pipe wall, the flow velocity is maximum at the pipe center, and the thickness of the boundary layer is not consistent for different pipe walls and fluids and flow velocities; the existing pitot tube generally only collects the total pressure and the static pressure of a certain point in a pipeline, so that the calculated fluid flow speed in the pipeline is inaccurate, and the static pressure measurement is also inaccurate due to the formation of vortex at a static pressure measuring port, so that the accuracy of a fluid flow value is influenced, particularly for large-caliber airflow, the insertion position of the existing pitot tube also influences the measurement result; on the other hand, the existing pitot tube is not strong in adaptability because the measuring head is not adjustable and can only be used for a pipeline with a certain pipe diameter.
Disclosure of Invention
The invention provides a novel pitot tube flow measuring instrument, aiming at the problems of insufficient accuracy and poor adaptability of the existing pitot tube for measuring fluid flow.
According to the embodiment of the invention, the pitot tube flow measuring instrument comprises an outer tube, a middle tube and an inner tube, wherein the inner tube is a hollow tube structure with an opening at the upper end and a sealed lower end; the upper end of the inner pipe is inserted into the lower end of the middle pipe to form a telescopic sleeve structure, a first sealing ring is arranged between the inner pipe and the middle pipe, the upper end of the middle pipe is inserted into the lower end of the outer pipe to form a telescopic sleeve structure, a second sealing ring is arranged between the outer pipe and the middle pipe, a middle pipe fluid collecting port is arranged on the pipe wall of the lower end of the middle pipe, the middle pipe fluid collecting port is positioned between the first sealing ring and the second sealing ring, an outer pipe fluid collecting port is arranged on the pipe wall of the lower end of the outer pipe, and the outer pipe fluid collecting port is positioned; the static pressure collection pipe is characterized by further comprising a static pressure collection pipe and a first pressure guide pipe, wherein a static pressure collection port of the static pressure collection pipe is arranged on the outer wall of the outer pipe, and the static pressure collection pipe is directly communicated with the first pressure guide pipe; the buffer cavity is communicated with the upper end of the outer pipe, and the buffer cavity is also communicated with the second pressure pipe; the differential pressure transmitter is characterized by further comprising a differential pressure transmitter and a flow integrating instrument, wherein two flow interfaces of the differential pressure transmitter are communicated with the first pressure guide pipe and the second pressure guide pipe respectively, and the flow integrating instrument is electrically connected with the differential pressure transmitter.
The technical principle of the invention is as follows: inserting the measuring instrument into a fluid pipeline to be measured, enabling an inner pipe fluid collecting port, a middle pipe fluid collecting port and an outer pipe fluid collecting port to face to the direction of fluid flow, wherein fluid obtained at the collecting ports comprises static pressure and dynamic pressure; the static pressure collecting pipe is arranged near the boundary layer, so that a more real static pressure is obtained. The differential pressure transmitter converts the differential pressure signal of total pressure and static pressure into an electric signal, and the flow integrating instrument calculates the obtained electric signal to obtain and display a flow value.
Compared with the prior art, the invention has the following beneficial effects:
1. the metering result is more accurate. Because a plurality of collecting ports are arranged in the flow pipe, collected fluid flows into the buffer cavity, the total pressure of the fluid obtained in the buffer cavity is closer to the average total pressure on a certain section in the pipe, and the hydrostatic pressure near the boundary layer collected by the hydrostatic collecting pipe is also closer to the real hydrostatic pressure of the fluid, so that the flow velocity obtained by the pressure difference value is closer to the average flow velocity of the certain section in the pipe, and a more accurate flow metering result can be obtained.
2. The adaptability is stronger. Because the outer pipe, the middle pipe and the inner pipe are designed into three-stage sleeve structures, the total length and each section can be stretched and adjusted, so that one pitot tube flow measuring instrument can measure the flow of fluid in all flow pipes within a certain diameter range, and the pitot tube flow measuring instrument has better adaptability.
Drawings
FIG. 1 is a flow velocity profile of a fluid flowing within a fluid conduit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pitot tube according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a pitot tube according to another embodiment of the invention.
FIG. 4 is a schematic diagram of the operation of a Pitot tube flow meter according to an embodiment of the present invention.
In the above drawings: 1. an inner tube; 2. a middle tube; 3. an outer tube; 4. a first seal ring; 5. a second seal ring; 6. a static pressure collection pipe; 7. a buffer chamber; 8. a first pressure pipe; 9. a second pressure pipe; 11. an inner tube fluid collection port; 12. a first fluid via; 13. a differential pressure transmitter; 14. a flow totalizer; 15. a first switch; 16. a second switch; 17. a fluid conduit; 21. a middle tube fluid collection port; 22. a second fluid via; 31. an outer tube fluid collection port; 61. a static pressure collection port.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
The first embodiment is as follows:
as shown in fig. 2, an embodiment of the present invention provides a pitot tube flow meter, which includes an outer tube 3, a middle tube 2 and an inner tube 1, wherein the inner tube 1 is a hollow tube structure with an open upper end and a sealed lower end, a fluid collecting port 11 of the inner tube is arranged on a tube wall of the lower end of the inner tube 1, and the outer tube 3 and the middle tube 2 are both hollow tube structures with open upper and lower ends; the upper end of the inner pipe 1 is inserted into the lower end of the middle pipe 2 to form a telescopic sleeve structure, and a first sealing ring 4 is arranged between the inner pipe 1 and the middle pipe 2 to prevent fluid from passing through a gap between the outer wall of the inner pipe 1 and the inner wall of the middle pipe 2. The middle pipe 2 is inserted into the outer pipe 3 at the upper end and the lower end to form a telescopic sleeve structure, and a second sealing ring 5 is arranged between the outer pipe 3 and the middle pipe 2 to prevent fluid from passing through a gap between the inner wall of the outer pipe 3 and the outer wall of the middle pipe 2.
A middle pipe fluid collecting port 21 is formed in the pipe wall of the lower end of the middle pipe 2, the middle pipe fluid collecting port 21 is located between the first sealing ring 4 and the second sealing ring 5, an outer pipe fluid collecting port 31 is formed in the pipe wall of the lower end of the outer pipe 3, and the outer pipe fluid collecting port 31 is located above the second sealing ring 5; still include static pressure collection pipe 6 and first pressure pipe 8, the static pressure collection mouth 61 of static pressure collection pipe 6 sets up on the outer wall of outer tube 3, and static pressure collection pipe 6 directly communicates with first pressure pipe 8. Still include cushion chamber 7 and second pressure pipe 9, cushion chamber 7 and the upper end intercommunication of outer tube 3, cushion chamber 7 still communicates with second pressure pipe 9.
S1 is S2+ S3, S1 is the sectional area of the middle tube fluid collecting port 21, S2 is the sectional area of the outer tube fluid collecting port 31, and S3 is the sectional area of the inner tube fluid collecting port 11, so that the total pressure of the fluid entering the buffer cavity can be closer to the actual total pressure value of the fluid. As shown in fig. 4, the outer tube fluid collection port 31 and the static pressure collection port 61 are symmetrically arranged with respect to the central axis of the outer tube, so that the outer tube fluid collection port 31 faces the flow direction of the fluid to measure an accurate total pressure, and the static pressure collection port 61 faces away from the flow direction of the fluid to measure an accurate static pressure. The first pressure pipe 8 is provided with a first switch 15, and the second pressure pipe 9 is provided with a second switch 16.
As shown in fig. 4, the system further comprises a differential pressure transmitter 13 and a flow integrator 14, wherein two flow interfaces of the differential pressure transmitter 13 are respectively communicated with the first pressure guiding pipe 8 and the second pressure guiding pipe 9, and the flow integrator 14 is electrically connected with the differential pressure transmitter 13.
Example two:
referring to fig. 3 and 4, a guide tube is provided on the inner tube and the middle tube, and the rest of the structure is the same as that of the first embodiment. The upper end of the inner tube 1 is provided with an inner tube guiding crown, the inner tube guiding crown is in clearance fit with the inner wall of the middle tube 2, the inner tube guiding crown or the upper end wall of the inner tube 1 is provided with a first fluid via hole 12, the inner tube guiding crown is arranged to ensure that the inner tube 1 has better stability in the middle tube 2, and the deformation of the telescopic tube body due to the disturbance of fluid is not easy to occur. The upper end of the middle pipe 2 is provided with a middle pipe guiding crown, the middle pipe guiding crown is in clearance fit with the inner wall of the outer pipe 3, and a second fluid through hole 22 is formed in the middle pipe guiding crown or the upper end wall of the middle pipe 2. The well pipe direction of setting is covered and is made well 2 stability in outer tube 3, is difficult for appearing the deformation of flexible body because of the disturbance of fluid.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. The pitot tube flow measuring instrument is characterized by comprising an outer tube (3), a middle tube (2) and an inner tube (1), wherein the inner tube (1) is of a hollow tube structure with an opening at the upper end and a sealed lower end, an inner tube fluid collecting port (11) is arranged on the tube wall at the lower end of the inner tube (1), and the outer tube (3) and the middle tube (2) are of hollow tube structures with openings at the upper end and the lower end;
the upper end of the inner pipe (1) is inserted into the lower end of the middle pipe (2) to form a telescopic sleeve structure, a first sealing ring (4) is arranged between the inner pipe (1) and the middle pipe (2), the upper end of the middle pipe (2) is inserted into the lower end of the outer pipe (3) to form a telescopic sleeve structure, a second sealing ring (5) is arranged between the outer pipe (3) and the middle pipe (2), a middle pipe fluid collecting port (21) is arranged on the pipe wall of the lower end of the middle pipe (2), the middle pipe fluid collecting port (21) is positioned between the first sealing ring (4) and the second sealing ring (5), an outer pipe fluid collecting port (31) is arranged on the pipe wall of the lower end of the outer pipe (3), and the outer pipe fluid collecting port (31) is positioned above the second;
the static pressure collecting pipe is characterized by further comprising a static pressure collecting pipe (6) and a first pressure guide pipe (8), a static pressure collecting port (61) of the static pressure collecting pipe (6) is formed in the outer wall of the outer pipe (3), and the static pressure collecting pipe (6) is directly communicated with the first pressure guide pipe (8);
the device is characterized by further comprising a buffer cavity (7) and a second pressure guide pipe (9), wherein the buffer cavity (7) is communicated with the upper end of the outer pipe (3), and the buffer cavity (7) is also communicated with the second pressure guide pipe (9);
the differential pressure type differential pressure flowmeter is characterized by further comprising a differential pressure transmitter (13) and a flow integrating instrument (14), wherein two flow interfaces of the differential pressure transmitter (13) are communicated with the first pressure guide pipe (8) and the second pressure guide pipe (9) respectively, and the flow integrating instrument (14) is electrically connected with the differential pressure transmitter (13).
2. The pitot tube flow meter of claim 1,
S1＝S2+S3；
wherein:
s1, the cross-sectional area of the middle pipe fluid collecting port (21);
s2, the cross-sectional area of the outer tube fluid collection port (31);
s3, the cross-sectional area of the inner tube fluid collection port (11).
3. A pitot tube flow meter according to claim 2, wherein said outer tube fluid collecting port (31) and said static pressure collecting port (61) are symmetrically disposed with respect to a central axis of the outer tube (3).
4. A pitot tube flow meter according to claim 3, wherein a first switch (15) is provided on the first impulse pipe (8).
5. A Pitot tube flow meter according to claim 4, characterized in that said second impulse pipe (9) is provided with a second switch (16).
6. A pitot tube flow meter according to claim 1, characterized in that the upper end of the inner tube (1) is provided with an inner tube guiding crown which is in clearance fit with the inner wall of the middle tube (2), and the inner tube guiding crown or the upper end wall of the inner tube (1) is provided with a first fluid passing hole (12).
7. The Pitot tube flow meter according to claim 6, wherein a middle tube guide crown is provided at an upper end of the middle tube (2), the middle tube guide crown is in clearance fit with an inner wall of the outer tube (3), and a second fluid passing hole (22) is provided on the middle tube guide crown or on an upper end wall of the middle tube (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010420977.4A CN111551218B (en) | 2020-05-18 | 2020-05-18 | Pitot tube flow measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010420977.4A CN111551218B (en) | 2020-05-18 | 2020-05-18 | Pitot tube flow measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111551218A true CN111551218A (en) | 2020-08-18 |
| CN111551218B CN111551218B (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010420977.4A Expired - Fee Related CN111551218B (en) | 2020-05-18 | 2020-05-18 | Pitot tube flow measuring instrument |
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| Country | Link |
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| CN (1) | CN111551218B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56120955A (en) * | 1980-02-29 | 1981-09-22 | Japan Atom Energy Res Inst | Measuring device by using pitot tube |
| US4959990A (en) * | 1989-04-10 | 1990-10-02 | Morris Robert H | Combined mass flow/pitot tube meter |
| DE10227373A1 (en) * | 2001-08-22 | 2003-03-13 | Systec Controls Mes Und Regelt | Static pressure sensor has detachable coupling element can fit different tube diameters |
| CN201081743Y (en) * | 2007-10-15 | 2008-07-02 | 铁岭铁光仪器仪表有限责任公司 | Cannula type flow sensor and intelligent cannula type flow meter with the cannula type flow sensor |
| JP2011128004A (en) * | 2009-12-17 | 2011-06-30 | Mitsubishi Heavy Ind Ltd | Gas flow velocity meter in gas-liquid two-phase flow |
| KR101057386B1 (en) * | 2011-06-29 | 2011-08-17 | 주식회사 마르센 | Averaging pitot tube for very low temperature |
| KR20140056886A (en) * | 2012-11-02 | 2014-05-12 | 대우조선해양 주식회사 | Pitot tube for hot water service line of floating marine structure with multiple measurement points and the flow velocity measurement method using this |
| CN104048706A (en) * | 2013-03-14 | 2014-09-17 | 迪特里奇标准公司 | Pitot Tube Traverse Assembly |
| CN105319388A (en) * | 2014-06-30 | 2016-02-10 | 波音公司 | MEMS-based conformal air speed sensor |
| CN209342180U (en) * | 2019-01-30 | 2019-09-03 | 南京善元琛波自动化设备有限公司 | A kind of Pi Tuoba flowmeter |
| CN110686736A (en) * | 2019-11-14 | 2020-01-14 | 上海权宥环保科技有限公司 | Pressure taking head of Pitotbar flow sensor |
-
2020
- 2020-05-18 CN CN202010420977.4A patent/CN111551218B/en not_active Expired - Fee Related
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56120955A (en) * | 1980-02-29 | 1981-09-22 | Japan Atom Energy Res Inst | Measuring device by using pitot tube |
| US4959990A (en) * | 1989-04-10 | 1990-10-02 | Morris Robert H | Combined mass flow/pitot tube meter |
| DE10227373A1 (en) * | 2001-08-22 | 2003-03-13 | Systec Controls Mes Und Regelt | Static pressure sensor has detachable coupling element can fit different tube diameters |
| CN201081743Y (en) * | 2007-10-15 | 2008-07-02 | 铁岭铁光仪器仪表有限责任公司 | Cannula type flow sensor and intelligent cannula type flow meter with the cannula type flow sensor |
| JP2011128004A (en) * | 2009-12-17 | 2011-06-30 | Mitsubishi Heavy Ind Ltd | Gas flow velocity meter in gas-liquid two-phase flow |
| KR101057386B1 (en) * | 2011-06-29 | 2011-08-17 | 주식회사 마르센 | Averaging pitot tube for very low temperature |
| KR20140056886A (en) * | 2012-11-02 | 2014-05-12 | 대우조선해양 주식회사 | Pitot tube for hot water service line of floating marine structure with multiple measurement points and the flow velocity measurement method using this |
| CN104048706A (en) * | 2013-03-14 | 2014-09-17 | 迪特里奇标准公司 | Pitot Tube Traverse Assembly |
| CN105319388A (en) * | 2014-06-30 | 2016-02-10 | 波音公司 | MEMS-based conformal air speed sensor |
| CN209342180U (en) * | 2019-01-30 | 2019-09-03 | 南京善元琛波自动化设备有限公司 | A kind of Pi Tuoba flowmeter |
| CN110686736A (en) * | 2019-11-14 | 2020-01-14 | 上海权宥环保科技有限公司 | Pressure taking head of Pitotbar flow sensor |
Non-Patent Citations (2)
| Title |
|---|
| K. NUKUI: "A study of characteristics of pitot type flow meter", 《SICE 2003 ANNUAL CONFERENCE (IEEE CAT. NO.03TH8734)》 * |
| 孙志强 等: "皮托管测量影响因素分析 II. 全压孔与静压孔的影响", 《传感技术学报》 * |
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