KR20160089850A - Flowmeter - Google Patents

Flowmeter Download PDF

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Publication number
KR20160089850A
KR20160089850A KR1020150151211A KR20150151211A KR20160089850A KR 20160089850 A KR20160089850 A KR 20160089850A KR 1020150151211 A KR1020150151211 A KR 1020150151211A KR 20150151211 A KR20150151211 A KR 20150151211A KR 20160089850 A KR20160089850 A KR 20160089850A
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KR
South Korea
Prior art keywords
diameter portion
outer diameter
pressure loss
inner diameter
pressure
Prior art date
Application number
KR1020150151211A
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Korean (ko)
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KR101721200B1 (en
Inventor
양정승
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양정승
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Publication of KR20160089850A publication Critical patent/KR20160089850A/en
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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
    • 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

Abstract

The present invention relates to a flowmeter capable of preventing the generation of a pressure loss caused by fouling of impurities included in a fluid, thereby maintaining a pressure loss evenly even when the operation hours increase and minimizing the pressure loss to enable continuous and accurate measurement of the rate of flow. The flowmeter comprises: a tube part where fluid flow pressure is generated; and a first pressure loss maintaining unit for minimizing the generation of a fluid pressure loss which is caused by fouling of impurities included in a fluid, fixated on the inner side of the tube part.

Description

Flowmeter {FLOWMETER}

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 flow meter 100 according to the invention is mounted in a tube section 110 of a fluid flow system in which fouling is a concern, Measure the flow rate.

Here, the fouling is adhesion of impurities contained in the fluid. Such a phenomenon may cause an error. However, in the case of the tube portion 110 formed by welding due to an error, It may be an inner shape.

That is, it means a surface error caused by a non-smooth inner surface.

The flow meter 100 according to the present invention includes a tube section 110 for generating a fluid flow differential pressure therein and a differential pressure sensor 130 for measuring a pressure difference of the fluid flowing through the tube section 110.

The flow meter 100 according to the present invention further includes a first pressure loss maintaining means 140 for preventing a pressure loss from occurring due to the fouling of impurities contained in the fluid flowing through the tube portion 110 .

1, the first pressure loss holding means 140 is mounted on the tube portion of a conventional differential pressure type venturi type flow meter, but the first pressure loss holding means 140 may be a pressure loss holding means such as shown in Figs. 5 and 6 It will be appreciated by a person skilled in the art that the present invention is applicable to an electronic flow meter such as a differential pressure type nozzle type flow meter or a differential pressure type cone type flow meter or a differential pressure type elbow type flow meter or the like which generates differential pressure or an ultrasonic flow meter.

A state in which the first pressure loss maintaining means 140 is applied to the differential pressure venturi type flow meter will be described below.

As can be seen, the tube 110 has a neck portion 112 extending horizontally by a predetermined length along the flow direction of the fluid as the fluid flow diameter becomes narrower. The neck portion 112 is formed on the front side of the neck portion 112, And an outlet portion 116 formed on the rear side of the neck portion 112 and having a cross-sectional area gently enlarged from the neck portion 112. The inlet portion 114 is formed at the rear side of the neck portion 112,

The tube portion 110 further includes straight tube portions 118 and 120 for stable fluid flow. The straight pipe sections 118 and 120 are connected to the front side of the inlet section 114 and the rear side of the outlet section 116 as shown, or are formed integrally.

Here, since the change of the fluid flowing through the tube portion 110 is a well-known technique, a detailed description thereof will be omitted.

The differential pressure sensor 130 is disposed outside the tube portion 110 to detect a difference between the pressure P1 of the fluid flowing through the inlet portion 114 of the tube portion 110 and the pressure P2 of the fluid flowing through the neck portion 112 . The differential pressure sensor 130 is connected to the inlet portion 114 and the neck portion 112 of the tube portion 110. The inlet portion 114 is formed with a front pressure tap 122 connected to the differential pressure sensor 130 And the neck portion 112 is formed with a rear pressure tap 124 connected to the differential pressure sensor 130.

That is, the differential pressure sensor 130 is connected to the inlet 114 and the neck 112 via the front pressure tap 122 and the rear pressure tap 124 to provide a fluid flow through the inlet 114 and neck 112 And the pressure P2 of the fluid flowing through the neck portion 112 are measured.

As shown in FIG. 7, in the case of the rear pressure tap 124, there is a risk that an impurity contained in the fluid accumulates in the rear pressure tap 124 and an error occurs in the measurement of the pressure P2 of the fluid. A second pressure loss maintaining means 150 is provided separately from the pressure loss maintaining means 140 and the rear pressure taps 124 or more preferably at the front end of the rear pressure taps 124 in addition to the first pressure loss holding means 140 .

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 rear pressure tap 124, thereby minimizing the error caused by such fouling.

Here, the method of calculating the flow rate from the difference between the pressures P1 and P2 measured by the differential pressure sensor 130 is a well-known technique, and thus a detailed description thereof will be omitted.

The differential pressure sensor 130 may use any differential pressure sensor 130 as long as the pressure P1 of the inlet 114 and the pressure P2 of the neck 112 can be measured.

The first pressure loss sustaining means 140 is provided on the inner circumferential surface of the tube portion 110 where the differential pressure is generated or the inner circumferential surface of the neck portion 112 formed inside the tube portion 110 to generate a differential pressure, An outer diameter portion 142 fixedly mounted on the inner circumferential surface of the neck portion 112 and an inner diameter portion 144 forming a fluid flow diameter D through which the fluid flowing from the inlet portion 114 flows, . The first pressure loss maintaining means 140 has a substantially annular ring shape. Here, a portion facing the flow direction of the fluid flowing through the tube portion 110 is referred to as a front side, and a portion facing the front side facing the fluid flow direction is described as a rear side.

The first pressure loss sustaining means 140 having the outer diameter portion 142 and the inner diameter portion 144 can prevent the front pressure tap 122 or the rear pressure tap 124 from being disturbed by the front pressure tap 122, Or at least one of the front pressure taps 122 and the rear pressure taps 122 without being interfered with the front pressure taps 122 and the rear pressure taps 124 One at least between the front and rear pressure taps 124, and between the front pressure taps 122 and the rear pressure taps 122.

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 tube portion 110 Any fixed mounting method may be used.

The outer circumferential portion 142 of the first pressure loss maintaining means 140 is fixed by welding or using an adhesive or a screw under the condition that the inner circumferential surface of the tube portion 110 and / or the inner circumferential surface of the neck portion 112 are in contact with each other Or a groove can be formed on the inner circumferential surface of the tube portion 110 and / or the inner circumferential surface of the neck portion 112 so that the first pressure loss holding means 140 can be fitted, (Not shown).

On the other hand, the first pressure loss sustaining means 140 is formed such that the cross-section thereof gradually narrows from the outer diameter portion 142 toward the inner diameter portion 144 side.

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 outer diameter portion 142 and the length of the outer diameter portion 142 connecting the outer diameter portion 142 and the inner diameter portion 144 Only the inclined portion 146 (the hypotenuse) connecting the outer diameter portion 142 and the inner diameter portion 144 is provided with the same length And has a triangular shape.

2 (a) and 1 (b), the outer diameter portion 142 and the inner diameter portion 144 of the first pressure loss maintaining means 140 may have a right triangle shape, (See FIG. 2 (a)), or a sloped portion (not shown) connecting the outer diameter portion 142 and the inner diameter portion 144 A vertical vertical portion 148 (opposite) facing the direction of flow of the fluid may be formed facing the flow direction of the fluid.

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 outer diameter portion 142 and horizontal with the outer diameter portion 142, (See Fig. 3 (a)).

The flow-diameter maintaining means 140 has a rectangular cross-sectional shape having a length equal to the width of the outer diameter portion 142 and narrowing toward the inner diameter portion 144 while extending toward the inner diameter portion 144 3 (b), (c)), or may have a pentagonal cross-sectional shape (see Fig. 3 (d)).

The inner diameter portion 144 of the flow diameter maintaining means 140 has a length that is shorter than the width W of the outer diameter portion 142 and is horizontal with the outer diameter portion 142, Sectional shape (see Fig. 4 (a)) extending forwardly of the inner diameter portion 142 toward the front of the outer diameter portion 144 and the inner diameter portion 142 144 have a width shorter than the width W of the outer diameter portion 142 and are parallel to the outer diameter portion 142 and the front of the inner diameter portion 144 is perpendicular to the front of the outer diameter portion 142 And the rear of the inner diameter portion 144 may have a rectangular cross-sectional shape extending obliquely rearward of the outer diameter portion 142 (see FIG. 4 (b)).

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 outer diameter portion 142 and is parallel to the outer diameter portion 142, 144 are perpendicular to the rear of the outer diameter portion 142 and the front of the inner diameter portion 144 extends obliquely toward the front side of the outer diameter portion 142 and then extends in a direction perpendicular to the front of the outer diameter portion 142 Or the first pressure loss holding means 140 has a shape in which the inner diameter portion 144 has a length that is shorter than the length W of the width of the outer diameter portion 142 (refer to (c) of FIG. 4) And the front of the inner diameter portion 144 is perpendicular to the front of the outer diameter portion 142 and the rear portion of the inner diameter portion 144 is inclined to the rear side of the outer diameter portion 142, (See Fig. 4 (d)) at a right angle to the rear of the neck portion 142. As shown in Fig.

The edge of the inner diameter portion 144 forming the fluid flow diameter D among the corners of the inner diameter portion 144 has a small R (round) value so that the impurities contained in the flowing fluid are not fouled, .

At this time, the R value of the edge of the inner diameter portion 140 forming the fluid flow diameter D may be different depending on the impurities contained in the fluid. Preferably, the R value has an R value of more than 0 and 3 mm or less. Here, if the R value of the edge exceeds 3 mm, the surface where the impurities come into contact with the edge portion of the inner diameter portion 132 increases, so that the attachment of the impurities to the inner diameter portion 144 progresses rapidly, The diameter D of the fluid flow formed by the inner diameter portion 144 of the fluid passage 140 is rapidly reduced.

The width W of the outer diameter portion 142 of the first pressure loss maintaining means 140 from the front to the rear of the outer diameter portion and the height H from the outer diameter portion 142 to the inner diameter portion 144 And the inclination angle? Of the inclined portion 146 connecting the outer diameter portion 142 and the inner diameter portion 144 are the same as those of the flow meter 100 according to the present invention. Is determined by the system and characteristics of the fluid flow system to be mounted.

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 outer diameter portion 142 from the outer diameter portion 142 to the inner diameter portion 144 and an inclination portion 146 connecting the outer diameter portion 142 and the inner diameter portion 144, Is determined in consideration of the pump capacity of the fluid flow system.

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 protrusion 144 may have a hexagonal cross-sectional shape if it can be processed sharply.

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 flow meter 100 according to the present invention thus formed has a first pressure loss maintaining means 140 having an inner diameter portion 144 having a sharp edge so as to prevent impurities from adhering thereto and forming a fluid flow diameter D therein, It is possible to prevent the impurities from adhering to the corners of the inner diameter portion 144 and thereby to maintain the same pressure loss even if the operating time increases, And it is possible to continuously measure the flow rate without using an expensive flow meter such as an ultrasonic flow meter.

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 tube portion 110 is provided with the straight tube portions 118 and 120, the present invention obviates the need for additional components and work for forming the straight tube portion in the field.

The flow meter 100 is not limited to the configuration and operation of the embodiments described above. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

100: Flow meter 110:
112: neck portion 114: inflow portion
116: outlet portion 118, 120: straight pipe portion
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)

1. A flow meter having a tube portion in which a fluid flow differential pressure is generated,
Wherein a first pressure loss maintaining means is fixedly mounted on an inner circumferential surface of the tube portion to minimize the occurrence of a fluid pressure loss due to wall adhesion of an impurity contained in the flowing fluid.
The method according to claim 1,
Wherein the first pressure loss maintaining means is formed integrally with the inner circumferential surface of the tube portion.
1. A flow meter having a tube portion in which a fluid flow differential pressure is generated,
Wherein a second pressure loss maintaining means is fixedly mounted to minimize the occurrence of a fluid pressure loss due to attachment of impurities contained in a fluid flowing to a front end of a rear pressure tap of a differential pressure sensor for measuring a pressure of fluid in the tube portion.
The method of claim 3,
And the second pressure loss maintaining means is formed integrally with the inner circumferential surface of the tube portion.
The method according to claim 1,
Wherein a second pressure loss maintaining means is fixedly mounted to minimize the occurrence of a fluid pressure loss due to attachment of impurities contained in a fluid flowing to a front end of a rear pressure tap of a differential pressure sensor for measuring a pressure of fluid in the tube portion.
The method of claim 5,
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.
The method according to claim 1 or 5,
Wherein the first pressure loss maintaining means comprises:
An outer diameter portion fixedly mounted on an inner circumferential surface of the neck portion; And
And an inner diameter portion forming a fluid flow diameter through which the fluid flowing from the inlet portion side flows.
The method according to claim 1 or 5,
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.
The method according to claim 1 or 5,
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.
The method according to claim 1 or 5,
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.
The method according to claim 1 or 5,
Wherein the first pressure loss maintaining means comprises:
Wherein the inner diameter portion has a rectangular cross-sectional shape having a length equal to the width of the outer diameter portion and being parallel to the outer diameter portion.
The method according to claim 1 or 5,
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.
The method according to claim 1 or 5,
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.
The method according to claim 1 or 5,
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, 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.
The method of claim 7,
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.
The method according to claim 1 or 5,
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.
The method according to claim 1 or 5,
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.
KR1020150151211A 2015-01-20 2015-10-29 Flowmeter KR101721200B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102106056B1 (en) * 2018-10-30 2020-04-29 주식회사 대한인스트루먼트 Venturi flowmeter

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JPS61246627A (en) * 1985-02-20 1986-11-01 クルツプ−コツパ−ス・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Venturi tube
CN201463945U (en) * 2009-07-27 2010-05-12 项家从 Composite flow sensor of Venturi tube

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
JPS61246627A (en) * 1985-02-20 1986-11-01 クルツプ−コツパ−ス・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Venturi tube
CN201463945U (en) * 2009-07-27 2010-05-12 项家从 Composite flow sensor of Venturi tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102106056B1 (en) * 2018-10-30 2020-04-29 주식회사 대한인스트루먼트 Venturi flowmeter
WO2020091384A1 (en) * 2018-10-30 2020-05-07 주식회사 대한인스트루먼트 Venturi flowmeter
CN113167611A (en) * 2018-10-30 2021-07-23 大韩仪器株式会社 Venturi flow meter
US11365993B2 (en) 2018-10-30 2022-06-21 Dae Han Instrument Co., Ltd Venturi flowmeter having a replaceable tube insert and ring element inserted in the main orifice of the venturi

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