KR101721200B1 - Flowmeter - Google Patents
Flowmeter Download PDFInfo
- Publication number
- KR101721200B1 KR101721200B1 KR1020150151211A KR20150151211A KR101721200B1 KR 101721200 B1 KR101721200 B1 KR 101721200B1 KR 1020150151211 A KR1020150151211 A KR 1020150151211A KR 20150151211 A KR20150151211 A KR 20150151211A KR 101721200 B1 KR101721200 B1 KR 101721200B1
- Authority
- KR
- South Korea
- Prior art keywords
- diameter portion
- outer diameter
- pressure loss
- inner diameter
- maintaining means
- Prior art date
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Classifications
-
- 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
-
- 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
-
- 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
- G01F1/42—Orifices or nozzles
-
- 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
- G01F1/44—Venturi 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
- G01F1/46—Pitot tubes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention makes it possible to prevent the pressure loss from occurring due to the fouling of impurities contained in the fluid, so that the pressure loss can be kept the same even if the operating time is increased, The flow meter being capable of minimizing the flow rate and continuously measuring the flow rate. The flow meter according to the present invention has a tube portion in which a fluid flow differential pressure is generated and a first pressure loss maintaining means is fixedly mounted on the inner circumferential surface of the tube portion to minimize fluid pressure loss due to adhesion of impurities contained in the flowing fluid .
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow meter, and more particularly, to a flow meter capable of minimizing occurrence of fouling of impurities contained in a fluid and pressure loss due to a surface treatment error in a tube portion.
The differential pressure type flow meter is a flow meter for measuring the flow rate of a fluid by using a differential pressure generated by the flow of the fluid. The differential pressure type flow meter is largely classified into an orifice, a nozzle, and a venturi.
Among the above-mentioned differential pressure type flow meters, Venturi type flow meters have a lower pressure loss than other differential pressure type flow meters. Therefore, they can be used over a long period of time and are economical compared to flow meters having a large pressure loss, such as orifices. .
However, since the venturi flow meter installed in the fluid flow system is fouling with the impurities contained in the fluid as the operating time increases, the cross-sectional area of the throat, that is, the flow diameter of the throat, .
In particular, the above-described problems have arisen in nuclear power plants and the like, and there are other problems that affect the output of a nuclear power plant due to such problems.
Related Prior Art Korean Patent Publication No. 2009-0005572 (published on Jan. 14, 2009, titled: flow measurement system) is available.
It is an object of the present invention to prevent pressure loss from occurring due to processing errors such as fouling of impurities contained in a fluid and welding of a surface, So that it is possible to continuously measure the accurate flow rate by minimizing the occurrence of pressure loss.
The present invention also provides a flow meter capable of measuring an accurate flow rate by reducing a detection error of a differential pressure sensor for measuring a pressure difference of a fluid.
The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems.
According to an aspect of the present invention, there is provided a flow meter having a tube portion where a fluid flow differential pressure is generated, the first pressure loss maintaining means minimizing the occurrence of a fluid pressure loss due to attachment of impurities contained in the flowing fluid, As shown in Fig.
The first pressure loss maintaining means is formed integrally with the inner peripheral surface of the tube portion.
The present invention relates to a flow meter having a tubular portion in which a fluid flow differential pressure is generated, in which the occurrence of fluid pressure loss is minimized by the attachment of impurities contained in the fluid flowing in front of the rear pressure tap of the differential pressure sensor measuring the pressure of the fluid in the tubular portion The second pressure loss maintaining means is fixed.
And the second pressure loss maintaining means is formed integrally with the inner circumferential surface of the tube portion.
The first pressure loss maintaining means includes: an outer diameter portion fixedly mounted on an inner circumferential surface of the neck portion; And an inner diameter portion forming a fluid flow diameter through which the fluid introduced from the inflow portion side flows.
Specifically, the first pressure loss maintaining means is formed such that the cross section gradually narrows from the outer diameter portion to the inner diameter portion side.
More specifically, the first pressure loss maintaining means may have a triangular shape in which the length of the width of the outer diameter portion and two inclined portions connecting the outer diameter portion and the inner diameter portion are provided with the same length, or the outer diameter portion and the inner diameter portion are connected Only the inclined portions are provided with the same length.
More specifically, the first pressure loss maintaining means may have a shape of a right angle triangle formed so as to face the flow direction of the fluid, and the inclined portion connecting the outer diameter portion and the inner diameter portion may have a right triangle shape, Perpendicular to the flow direction of the fluid.
More specifically, the first pressure loss maintaining means has a rectangular sectional shape in which the inner diameter portion has a length equal to the width of the outer diameter portion and is horizontal with the outer diameter portion.
More specifically, the first pressure loss maintaining means has a rectangular cross-sectional shape or a pentagonal cross-sectional shape which has a length equal to the width of the outer diameter portion and extends toward the inner diameter side and narrows toward the inner diameter side gradually.
More specifically, the first pressure loss maintaining means is constituted such that the inner diameter portion has a length shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion, the rear portion of the inner diameter portion is perpendicular to the rear portion of the outer diameter portion, The inner diameter portion has a length that is shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion. The front portion of the inner diameter portion is perpendicular to the front of the outer diameter portion, Sectional shape in which the rear portion of the outer diameter portion extends obliquely rearward of the outer diameter portion.
More specifically, the first pressure loss maintaining means is constituted such that the inner diameter portion has a length shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion, the rear portion of the inner diameter portion is perpendicular to the rear portion of the outer diameter portion, The outer diameter portion is inclined forwardly and then extends in a direction perpendicular to the front of the outer diameter portion or the inner diameter portion has a length shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion, And the rear portion of the inner diameter portion has a cross-sectional shape perpendicular to the rear of the outer diameter portion after extending obliquely to the rear side of the outer diameter portion.
Specifically, the edge forming the fluid flow diameter among the corners on the inner diameter side is sharpened so as to have an R value of more than 0 and 3 mm or less so that the impurities do not adhere.
Specifically, the first pressure loss maintaining means may be fixedly mounted on at least one of the front side of the front pressure taps formed on the tube portion, the rear side of the rear pressure taps, or between the front pressure taps and the rear pressure taps, One or more fixedly mounted on the front side of the pressure tap, the rear side of the rear pressure tap, and between the front pressure tap and the rear pressure tap.
Specifically, the first pressure loss maintaining means is made of titanium or is made of stainless steel or carbon steel coated with either one selected from tungsten carbide, stellite and ceramic so as not to be abraded by the flowing fluid.
As described above, the flow meter according to the present invention has the following advantages.
First, by mounting the pressure loss maintaining means having an inner diameter portion having a sharp edge to prevent impurities from adhering and forming a fluid flow diameter therein, to the tube portion of the flow meter in which the differential pressure is generated, impurities are adhered to the edge of the inner diameter portion The pressure loss can be kept the same even if the operating time is increased, thereby minimizing the occurrence of pressure loss, and continuously measuring the accurate flow rate without using an expensive flow meter such as an ultrasonic flow meter There is an advantage to be able to do.
Second, since the present invention can be applied to a flow meter that has passed the verification test or a flow meter installed in a fluid flow system such as a nuclear power plant through the verification test, And the cost and time of the verification test can be reduced.
Third, since the present invention can continuously measure the flow rate with high precision, it can expect an improvement in operating efficiency when applied to a fluid flow system of a nuclear power plant or the like, and also can prevent an economic loss due to a stable output of a nuclear power plant There is an advantage to be able to.
Fourth, the present invention is advantageous in that additional components and work for forming the straight pipe portion in the field are unnecessary because the pipe portion is provided with the straight pipe portion.
1 is a cross-sectional view schematically showing a flow meter according to the present invention,
FIG. 2 is a view showing another embodiment of the first pressure loss maintaining means shown in FIG. 1,
Fig. 3 is a view showing still another embodiment of the first pressure loss maintaining means shown in Fig. 1,
FIG. 4 is a view showing still another embodiment of the first pressure loss maintaining means shown in FIG. 1,
5 is a view showing a state in which the first pressure loss maintaining means shown in FIG. 1 is applied to a nozzle type flow meter,
FIG. 6 is a view showing a state in which the first pressure loss maintaining means shown in FIG. 1 is applied to a cone type flowmeter,
7 is a view showing a second pressure loss maintaining means in the flow meter according to the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
1 shows a flow meter according to the present invention in which a
Here, the fouling is adhesion of impurities contained in the fluid. Such a phenomenon may cause an error. However, in the case of the
That is, it means a surface error caused by a non-smooth inner surface.
The
The
1, the first pressure
A state in which the first pressure
As can be seen, the
The
Here, since the change of the fluid flowing through the
The
That is, the
As shown in FIG. 7, in the case of the
In the embodiment, only the second pressure loss holding means 150 may be less effective than the embodiment of the present invention, but only the second pressure loss holding means 150 may be formed.
The second pressure loss holding means 150 can reduce the fouling occurring on the wall surface of the
Here, the method of calculating the flow rate from the difference between the pressures P1 and P2 measured by the
The
The first pressure loss sustaining means 140 is provided on the inner circumferential surface of the
The first pressure loss sustaining means 140 having the
Various methods can be used as the method of fixing the first pressure loss holding means 140. However, if the first pressure loss holding means 140 is not fixed by the fluid flowing through the
The outer
On the other hand, the first pressure loss sustaining means 140 is formed such that the cross-section thereof gradually narrows from the
That is, the cross-sectional shape of the first pressure loss holding means 140 is formed so that the length of the width W of the
2 (a) and 1 (b), the
Further, the first pressure loss holding means 140 may have a rectangular cross-sectional shape.
That is, the flow-diameter maintaining means 140 has a rectangular cross-sectional shape having a length equal to the width W of the width of the
The flow-diameter maintaining means 140 has a rectangular cross-sectional shape having a length equal to the width of the
The
The first pressure loss sustaining means 140 includes a first pressure loss maintaining means 140 having a length that is shorter than the width W of the width of the
The edge of the
At this time, the R value of the edge of the
The width W of the
Particularly, when only the first pressure loss maintaining means 140 of the present invention is fixedly mounted on the venturi installed on the fluid flow system, the pressure loss will reduce the flow rate of the fluid flow system, A width H of the
Only the first pressure loss sustaining means 140 having the triangular, square, and cross-sectional shapes of the sectional shape of the first pressure loss sustaining means 140 has been described. However, The edge of the
On the other hand, the first pressure loss sustaining means 140 is made of a metal resistant to abrasion, preferably titanium, since it is directly exposed to a fluid to be flowed, or made of stainless steel or carbon steel and then hard tungsten carbide, Ceramics or the like.
The
Further, since the present invention can be applied to a flow meter that has passed the verification test or a flow meter installed in a fluid flow system such as a nuclear power plant after passing the verification test, The use of flowmeters allows cost and time savings for manufacturing and verification testing.
In addition, since the present invention can continuously measure the flow rate with high precision, it is expected not only to improve the operating efficiency of a nuclear power plant when applied to a fluid flow system of a nuclear power plant, but also to prevent economical loss by a stable output I will.
Further, since the
The
100: Flow meter 110:
112: neck portion 114: inflow portion
116:
122: front pressure tap 124: rear pressure tap
130: differential pressure sensor 140: first pressure loss maintaining means
142: outer diameter portion 144: inner diameter portion
150: second pressure loss maintaining means
Claims (17)
A first pressure loss maintaining means for minimizing occurrence of a fluid pressure loss due to wall adhesion of an impurity contained in a flowing fluid is fixedly mounted in a ring shape on the inner circumferential surface of a venturi-
The first pressure loss maintaining means includes an outer diameter portion fixedly mounted on an inner circumferential surface of the venturi-like tube portion; And
And an inner diameter portion forming a fluid flow diameter through which fluid flowing from the inlet portion side flows.
Wherein the first pressure loss maintaining means is formed integrally with the inner circumferential surface of the tube portion.
A second pressure loss maintaining means for minimizing generation of a fluid pressure loss due to the attachment of impurities contained in the fluid flowing at the front end of the rear pressure taps of the differential pressure sensor measuring the pressure of the fluid in the tube portion, Which is fixed to the inner circumferential surface of the tubular portion of the housing 10 in the form of a ring,
The second pressure loss maintaining means includes an outer diameter portion fixedly mounted on an inner circumferential surface of the venturi-like tube portion; And
And an inner diameter portion forming a fluid flow diameter through which fluid flowing from the inlet portion side flows.
And the second pressure loss maintaining means is formed integrally with the inner circumferential surface of the tube portion.
A second pressure loss maintaining means for minimizing occurrence of a fluid pressure loss due to the attachment of impurities contained in the fluid flowing to the front end of the rear pressure taps of the differential pressure sensor for measuring the pressure of the fluid in the tube portion, And is fixedly mounted in a ring shape on an inner circumferential surface of a tube portion of the flow tube.
Wherein at least one of the first pressure loss maintaining means and the second pressure loss maintaining means is formed integrally with the inner circumferential surface of the tube portion.
Wherein the first pressure loss maintaining means comprises:
And a cross-sectional area of the outer diameter portion is gradually narrowed toward the inner diameter portion side.
Wherein the first pressure loss maintaining means comprises:
Only two inclined portions connecting the outer diameter portion and the inner diameter portion are provided with the same length or only the inclined portions connecting the outer diameter portion and the inner diameter portion are the same A flow meter having a triangular shape provided in a length.
Wherein the first pressure loss maintaining means comprises:
A tilted inclined portion connecting the outer diameter portion and the inner diameter portion has a right triangular shape formed to face the flow direction of the fluid or a vertical vertical portion facing the inclined portion connecting the outer diameter portion and the inner diameter portion A flow meter having a right triangular shape formed to face the fluid flow direction.
Wherein the first pressure loss maintaining means comprises:
Wherein the inner diameter portion has a length equal to the width of the outer diameter portion and has a rectangular cross-sectional shape that is parallel to the outer diameter portion.
Wherein the first pressure loss maintaining means comprises:
The flowmeter having a rectangular cross-sectional shape or a pentagonal cross-sectional shape having a length equal to the width of the outer diameter portion and extending toward the inner diameter portion side and gradually narrowing toward the inner diameter portion side.
Wherein the first pressure loss maintaining means comprises:
Wherein the inner diameter portion has a length shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion, the rear portion of the inner diameter portion is perpendicular to the rear portion of the outer diameter portion, Or the inner diameter portion has a length that is shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion and the front of the inner diameter portion is perpendicular to the front of the outer diameter portion, And a rear portion of the inner diameter portion has a rectangular sectional shape extending obliquely rearward of the outer diameter portion.
Wherein the first pressure loss maintaining means comprises:
Wherein the inner diameter portion has a length that is shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion, the rear portion of the inner diameter portion is perpendicular to the rear portion of the outer diameter portion, And the inner diameter portion has a length that is shorter than the width of the outer diameter portion and is horizontal with the outer diameter portion, and the front portion of the inner diameter portion is parallel to the front end of the outer diameter portion, The flowmeter having a cross-sectional shape at right angles to the front of the outer diameter portion and rearward of the inner diameter portion being inclined to the rear side of the outer diameter portion and then perpendicular to the rear of the outer diameter portion.
And the edge forming the fluid flow diameter among the corners on the inner diameter side is sharpened so as to have an R value of not less than 0 but not more than 3 mm so that the impurities do not adhere thereto.
Wherein the first pressure loss maintaining means comprises:
At least one of which is fixedly mounted on the front side of the front pressure taps formed on the tubular portion or on the rear side of the rear pressure taps or between the front pressure taps and the rear pressure taps or on the front side of the front pressure taps, And one or more fixedly mounted between the front pressure taps and the rear pressure taps.
Wherein the first pressure loss maintaining means comprises:
A flow meter made of titanium or made of stainless steel or carbon steel coated with either one selected from tungsten carbide, stellite, and ceramic so as not to be worn by flowing fluids.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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KR20150009317 | 2015-01-20 | ||
KR1020150009317 | 2015-01-20 | ||
KR1020150026954 | 2015-02-26 | ||
KR20150026954 | 2015-02-26 |
Publications (2)
Publication Number | Publication Date |
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KR20160089850A KR20160089850A (en) | 2016-07-28 |
KR101721200B1 true KR101721200B1 (en) | 2017-03-29 |
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KR1020150151211A KR101721200B1 (en) | 2015-01-20 | 2015-10-29 | Flowmeter |
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KR (1) | KR101721200B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102106056B1 (en) * | 2018-10-30 | 2020-04-29 | 주식회사 대한인스트루먼트 | Venturi flowmeter |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201463945U (en) * | 2009-07-27 | 2010-05-12 | 项家从 | Composite flow sensor of Venturi tube |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3505833A1 (en) * | 1985-02-20 | 1986-08-21 | Krupp Koppers GmbH, 4300 Essen | VENTURI TUBE |
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Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201463945U (en) * | 2009-07-27 | 2010-05-12 | 项家从 | Composite flow sensor of Venturi tube |
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