KR20170087110A - Average pitot tube type flow meter - Google Patents
Average pitot tube type flow meter Download PDFInfo
- Publication number
- KR20170087110A KR20170087110A KR1020160006539A KR20160006539A KR20170087110A KR 20170087110 A KR20170087110 A KR 20170087110A KR 1020160006539 A KR1020160006539 A KR 1020160006539A KR 20160006539 A KR20160006539 A KR 20160006539A KR 20170087110 A KR20170087110 A KR 20170087110A
- Authority
- KR
- South Korea
- Prior art keywords
- voltage
- tube
- pipe
- static pressure
- fluid
- Prior art date
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Classifications
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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
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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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
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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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
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- 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
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
- G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
- G01P5/165—Arrangements or constructions of Pitot tubes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
The average pitot tube type flow meter 1000 according to the present invention has a voltage tube 100 and a static pressure tube 200 which are spaced apart from each other and the respective voltage holes 108 of the voltage tube 100 are provided with forward And a straight pipe 180 installed in the voltage tube so that the rear opening S2 and the rear opening S2 surround the voltage hole 108. [
Description
The present invention relates to an average pitot tube type flow meter, and more particularly, to an improved average pitot tube type flow meter that does not require a straight pipe with a simple structure.
When the average pitot tube type flowmeter is installed in a pipeline, the flow of the fluid in front of and behind the flowmeter must be stabilized, and accordingly, an intuitive portion longer than a certain distance from these front and rear sides is required.
In this connection, the applicant of the present invention invented a patent of an average pitot tube type flow meter of Korean Patent No. 10-1326189, which is provided with a separated voltage tube and a static pressure tube, and a rectifier is installed in each of the voltage holes of the voltage tube . According to this patent, the length of the straight pipe portion can be reduced, and the burden of the installation of the conventional rectifying device can be reduced.
However, according to the above patent, when the flow meter of the patent is vertically installed in a bend (i.e., a tube equipped with an elbow), the differential pressure is not stable compared with the case where the flow meter of the patent is vertically installed in the straight pipe, This means that the accuracy of the flowmeter is lowered when the flowmeter of the patent is vertically installed in the bend.
The applicant of the present invention has developed an easy-to-install pitot tube type flow meter with a simple structure, as well as an intuitive pipe, which does not require an intuitive portion for a curved pipe, increases the accuracy of flow measurement without burdening the installation of a rectifying device, And has reached the present invention following the patent.
The present invention has a simpler structure than the Korean Patent No. 10-1326189 of the applicant of the present invention. The accuracy of the flow measurement is increased not only for the straight pipe but also for the bending pipe. Since the straight pipe portion is not required and the installation of the rectifying device is not required, To provide a pitot tube type flow meter.
The present invention provides a power supply apparatus comprising: a voltage tube having a plurality of voltage holes formed along its longitudinal direction and installed along a direction perpendicular to a flow of fluid in a conduit; A static pressure pipe installed along a direction perpendicular to the flow of the fluid in the pipeline and provided at a rear of the voltage pipe; And a straight pipe installed to each voltage hole of the voltage tube and attached to the voltage tube such that the front and rear are opened and the rear opening covers the voltage hole, Wherein the static pressure pipe is connected to a differential pressure gauge to measure the difference in pressure formed inside the voltage pipe and the static pressure pipe, and measures the flow rate or flow rate of the fluid flowing through the pipe by the measured differential pressure. And a flow rate measuring device.
According to the present invention, the ratio of the length of the straight pipe to the diameter of the voltage hole is preferably 4: 1 to 6: 1, and most preferably 5: 1.
According to the present invention, it is preferable that the voltage tube and the static pressure tube are installed to be spaced apart from each other along the flow direction of the fluid.
The present invention also includes a voltage tube having a plurality of voltage holes formed along its longitudinal direction and installed along a direction perpendicular to the flow of the fluid in the conduit; A static pressure pipe installed along a direction perpendicular to the flow of the fluid in the pipeline and provided at a rear of the voltage pipe; Wherein the front and rear openings are provided to the respective voltage holes of the voltage tube and are attached to the voltage tube such that the front and rear openings and the rear openings surround the voltage hole, Wherein the voltage tube and the static pressure pipe are connected to a differential pressure gauge to measure a difference in pressure formed inside each of the voltage tube and the static pressure pipe, And a flow rate or a flow rate of the fluid flowing through the pipeline is measured.
The present invention provides a pitot tube type flow meter that does not require an introductory section and is free from the burden of installing a rectifying device and thus increases the degree of freedom of installation and is easy to install with a simple structure. According to the present invention, the precision of the flow measurement is increased not only for the straight pipe but also for the bending pipe as a simpler structure than the Korean Patent No. 10-1326189 of the present applicant.
The present invention also provides a pitot tube type flow meter in which the accuracy is increased and the reliability is improved in a manner not shown in Korean Patent No. 10-1326189 of the present applicant.
FIG. 1 to FIG. 3 are views showing the structure of a pitot tube type flow meter according to an embodiment of the present invention;
FIG. 4 is a view showing a pitot tube type flow meter installed in a bending tube according to the conventional patent;
FIG. 5 is a view showing a pitot tube type flowmeter according to the present invention installed in a bend;
6 is a view showing the structure of a pitot tube type flow meter according to a second aspect of the present invention;
FIG. 7 is a view showing a pitot tube type flow meter according to a second aspect of the present invention installed in a bend.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.
FIG. 1 shows an average pitot tube type
As shown, a
Each of the
The
The
Each of the
According to the present invention, the
1, a
3, a
The lower portions of the
An average pitot tube type flow meter of Korean Patent No. 10-1326189 was installed on a straight pipe and the average pressure applied to the voltage tube and the static pressure tube was measured to be 603.035 pa and -156.405 Pa, respectively. (In this case, the velocity of the inlet in the voltage tube was 1 m / s.)
However, when the mean pitot tube
The mean pitot tube
The average pitot tube
As described above, according to the present invention, the pressure applied to the voltage tube and the static pressure tube, which were intuitive, compared with the conventional patent No. 10-1326189, are maintained to be similar to each other, and the precision is improved.
According to the present invention, it can be understood that the structure is simpler than that of the prior art No. 10-1326189. Thus, the present invention improves precision while increasing the degree of freedom of installation with a simple structure.
The ratio of the length L of the
In the case where the ratio is less than 4: 1, for example, 3: 1, the deviation of the pressure value applied to the
The present invention is also characterized in that two
That is, the
The mean pitot tube
The mean pitot tube
In this case, it can be seen that the precision in the
Particularly, according to the
That is, the mean pitot tube
100; Voltage tube
200: static pressure pipe
108: voltage hole
208: static pressure hole
180: intuitive
Claims (5)
(b) a static pressure pipe formed along the longitudinal direction of the plurality of static pressure holes, the static pressure pipe installed along a direction perpendicular to the flow of the fluid in the pipe, and installed at the rear of the voltage pipe;
(c) installed to the respective voltage holes of the voltage tube, the front and rear openings being attached to the voltage tube such that the rear openings surround the voltage holes, and the front and rear openings The voltage tube and the static pressure tube are connected to the differential pressure meter to measure a difference in pressure formed in each of the voltage tube and the static pressure tube, and the pressure difference between the pressure tube and the static pressure tube, And the flow velocity or the flow rate of the fluid is measured.
Wherein the ratio of the length of the straight pipe to the diameter of the voltage hole is between 4: 1 and 6: 1.
Wherein the ratio of the length of the straight pipe to the diameter of the voltage hole is 5: 1.
Wherein the voltage tube and the static pressure tube are installed to be spaced apart from each other along the flow direction of the fluid.
(b) a static pressure pipe formed along the longitudinal direction of the plurality of static pressure holes, the static pressure pipe installed along a direction perpendicular to the flow of the fluid in the pipe, and installed at the rear of the voltage pipe;
(c) installed to the respective voltage holes of the voltage tube, wherein the front and rear openings are opened and the rear openings are attached to the voltage tube so as to surround the voltage holes, and the front and rear openings Wherein the voltage tube and the static pressure tube are connected to a differential pressure gauge to measure a difference in pressure formed inside each of the voltage tube and the static pressure pipe, Wherein the flow rate or flow rate of the fluid flowing through the channel is measured by the flow rate measuring device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020160006539A KR101789543B1 (en) | 2016-01-19 | 2016-01-19 | Average pitot tube type flow meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160006539A KR101789543B1 (en) | 2016-01-19 | 2016-01-19 | Average pitot tube type flow meter |
Publications (2)
Publication Number | Publication Date |
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KR20170087110A true KR20170087110A (en) | 2017-07-28 |
KR101789543B1 KR101789543B1 (en) | 2017-10-26 |
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Family Applications (1)
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KR1020160006539A KR101789543B1 (en) | 2016-01-19 | 2016-01-19 | Average pitot tube type flow meter |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108896121A (en) * | 2018-06-08 | 2018-11-27 | 华北电力大学 | A kind of axial flow blower flow measurement device based on cross probe |
KR20210012802A (en) * | 2019-07-26 | 2021-02-03 | 삼성중공업 주식회사 | Mud density measuring device for drill ship |
KR20220123982A (en) * | 2021-03-02 | 2022-09-13 | 에스피티씨주식회사 | Prefab Chimney Flow Measuring Device with Pitot Tube Assembly |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7654157B2 (en) * | 2007-11-30 | 2010-02-02 | Honeywell International Inc. | Airflow sensor with pitot tube for pressure drop reduction |
KR101326189B1 (en) * | 2012-08-20 | 2013-11-07 | 주식회사 대한인스트루먼트 | Average pitot tube type flow meter |
-
2016
- 2016-01-19 KR KR1020160006539A patent/KR101789543B1/en active IP Right Grant
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108896121A (en) * | 2018-06-08 | 2018-11-27 | 华北电力大学 | A kind of axial flow blower flow measurement device based on cross probe |
KR20210012802A (en) * | 2019-07-26 | 2021-02-03 | 삼성중공업 주식회사 | Mud density measuring device for drill ship |
KR20220123982A (en) * | 2021-03-02 | 2022-09-13 | 에스피티씨주식회사 | Prefab Chimney Flow Measuring Device with Pitot Tube Assembly |
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Publication number | Publication date |
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KR101789543B1 (en) | 2017-10-26 |
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