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KR20170087110A - Average pitot tube type flow meter - Google Patents

Average pitot tube type flow meter Download PDF

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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
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KR
South Korea
Prior art keywords
voltage
tube
pipe
static pressure
fluid
Prior art date
Application number
KR1020160006539A
Other languages
Korean (ko)
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KR101789543B1 (en
Inventor
송승준
장광문
김도형
김은재
오태호
Original Assignee
주식회사 대한인스트루먼트
Priority date (The priority date 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 date listed.)
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Priority to KR1020160006539A priority Critical patent/KR101789543B1/en
Publication of KR20170087110A publication Critical patent/KR20170087110A/en
Application granted granted Critical
Publication of KR101789543B1 publication Critical patent/KR101789543B1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05Measuring 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
    • G01F1/34Measuring 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
    • G01F1/36Measuring 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
    • G01F1/40Details of construction of the flow constriction devices
    • G01F1/46Pitot tubes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78Direct mass flowmeters
    • G01F1/80Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84Coriolis or gyroscopic mass flowmeters
    • G01F1/8409Coriolis or gyroscopic mass flowmeters constructional details
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78Direct mass flowmeters
    • G01F1/80Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84Coriolis or gyroscopic mass flowmeters
    • G01F1/845Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/14Measuring 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
    • G01P5/16Measuring 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
    • G01P5/165Arrangements 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

[0001] The present invention relates to an average pitot tube type flow meter,

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 flow measurement apparatus 1000 according to an embodiment of the present invention, and FIGS. 2 and 3 show that the average pitot tube type flow measurement apparatus 1000 is installed in a tube 90 .

As shown, a voltage tube 100, which is a voltage forming tube, and a static pressure tube 200, which is a tube that forms a static pressure, are provided, and each has a plurality of voltage holes 108 and a constant-pressure hole 208 Which are installed along the direction perpendicular to the flow of the fluid in the tube 90.

Each of the voltage tube 100 and the static pressure tube 200 is provided with a valve (not shown) through connection pipes 18 and 28. These valves are connected to a differential pressure gauge (not shown) The difference in pressure (dynamic pressure) formed inside the tube 200 is measured, and the flow rate and the flow rate are determined by the measured dynamic pressure.

The voltage tube 100 is provided with a straight tube 180 with respect to each of the voltage holes 108.

The straight pipe 180 is a pipe provided in the flow direction of the fluid so that the front portion S1 and the rear portion S2 thereof are opened and the open portion S2 at the rear side thereof surrounds the voltage hole 108, 100). The inside of these pipes 180 are communicated as they are. That is, other elements, for example, commutators, etc., are not installed but are in communication with each other.

Each of the straight tubes 180 may be welded to the voltage tube 100 such that the openings S2 on the rear side thereof surround the respective voltage holes 108 of the voltage tube 100.

According to the present invention, the voltage tube 100 and the static pressure tube 200 are installed apart from each other along the flow direction of the fluid.

1, a flange 40 is provided, and the voltage tube 100 and the static pressure tube 200 are coupled to the upper side of the flange 40, respectively, The static pressure pipe 200 is connected to the connection pipes 18 and 28 provided on the flange 40. The connection pipes 18 and 28 are connected to a differential pressure gauge (not shown) The pressure formed in each of the voltage tube 100 and the inside 160 of the static pressure tube 200 is transmitted to the differential pressure meter.

3, a voltage tube 100 and a static pressure tube 200 are installed in the tube 90 in a direction perpendicular to the flow path and are connected to the connection tube 58 at an upper portion of the tube 90 The lower flange 50 and the flange 40 are combined.

The lower portions of the voltage tube 100 and the static pressure tube 200 have pins 103 and 203 respectively protruding to the lower portion of the tube 90 and the pins 103 and 203 And a cap 320 is welded to the adapter 310. The cap 310 is welded to the lower surface of the pipe 90. The cap 310 is welded to the adapter 310 in a flat plate shape.

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 type flow meter 2000 according to the above patent was installed in the bending pipe 290 as shown in Fig. 4, the average pressure applied to the voltage tube and the static pressure tube was measured, and it was 521.051 pa and -179.815 Pa, And the deviation was large. (In this case, the velocity of the inlet in the voltage tube is 1 m / s, and the distance from the pitot type flowmeter installed in the bending tube 290 to the elbow pipe is 4D with respect to the diameter D of the pipe.)

The mean pitot tube type flow meter 1000 according to the present invention was installed on a straight pipe and the average pressure applied to the voltage tube and the static pressure pipe was measured to be 642.812 Pa and -370.671 Pa, respectively. 3, the length L of the straight pipe 180 is set to 5D with respect to the diameter D of the voltage hole 108.) In this case, the speed of the inlet in the voltage tube is 1 m / s.

The average pitot tube type flow meter 1000 according to the present invention was installed in a bending pipe 290 as shown in Fig. 5 and the average pressure applied to the voltage pipe and the static pressure pipe was measured. As a result, it was 648.460 pa and -345.129 Pa, It can be understood that the deviation is significantly narrowed as compared with the average pitot tube type flow meter of the patent. (In this case, the velocity of the inlet in the voltage tube is 1 m / s, and the distance from the pitot type flowmeter installed in the bending tube 290 to the elbow pipe is 4D with respect to the diameter D of the pipe.)

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 straight pipe 180 to the diameter D of the voltage hole 108 is in the range of 4: 1 to 6: 1, preferably 5: 1 .

In the case where the ratio is less than 4: 1, for example, 3: 1, the deviation of the pressure value applied to the voltage tube 100 and the pressure tube 200, respectively, If the ratio exceeds 6: 1, the length (L) of the straight pipe may be too long to be installed.

The present invention is also characterized in that two plate members 41a and 41b are arranged in a cruciform shape between the front and rear openings S1 and S2 of the respective straight pipes 180 ' Type flow meter 3000 is provided.

That is, the flow meter 1000 of the pitot tube type according to the first aspect of the present invention communicates the openings S1 and S2 on the front and rear sides of the respective straight pipe 180 as they are, Two plate members 41a and 41b are disposed in a cross shape between the front and rear openings S1 and S2 of the straight pipe 180 '.

The mean pitot tube type flow meter 3000 according to the second aspect of the present invention was installed on a straight pipe and the average pressure applied to the voltage pipe and the static pressure pipe was measured to be 651.512 Pa and -372.368 Pa, respectively. (In this case, the velocity of the inlet in the voltage tube was 1 m / s.) Also, the length L of the straight pipe 180 'was 5 D with respect to the diameter D of the voltage hole 108.)

The mean pitot tube type flow meter 3000 according to the second aspect of the present invention was installed in a curved tube 290 as shown in FIG. 7, and the average pressure applied to the voltage tube and the static pressure tube was measured to be 649.640pa and -347.527 Pa, it can be seen that the deviation is not large with respect to the straight pipe. (In this case, the velocity of the inlet in the voltage tube is 1 m / s, and the distance from the pitot type flowmeter installed in the bending tube 290 to the elbow pipe is 4D with respect to the diameter D of the pipe.)

In this case, it can be seen that the precision in the bending tube 290 is greatly increased as compared with the case of the embodiment of the patent 10-1326189, because the plate members 41a and 41b serve as commutators.

Particularly, according to the second aspect 3000 of the present invention, the deviation of the measured value is smaller than that according to the first aspect 1000, thereby increasing the reliability.

That is, the mean pitot tube type flow meter 3000 according to the second aspect of the present invention shows that the deviation of the measured pressure value in each of the straight pipe and the bending pipe is small and the deviation of the measured value is small, thereby improving accuracy and reliability.

100; Voltage tube
200: static pressure pipe
108: voltage hole
208: static pressure hole
180: intuitive

Claims (5)

(a) 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;
(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.
The method according to claim 1,
Wherein the ratio of the length of the straight pipe to the diameter of the voltage hole is between 4: 1 and 6: 1.
3. The method of claim 2,
Wherein the ratio of the length of the straight pipe to the diameter of the voltage hole is 5: 1.
4. The method according to any one of claims 1 to 3,
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.
(a) 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;
(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.
KR1020160006539A 2016-01-19 2016-01-19 Average pitot tube type flow meter KR101789543B1 (en)

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Application Number Priority Date Filing Date Title
KR1020160006539A KR101789543B1 (en) 2016-01-19 2016-01-19 Average pitot tube type flow meter

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KR101789543B1 KR101789543B1 (en) 2017-10-26

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Cited By (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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