KR20180014998A - Leak rate measuring appratus - Google Patents

Abstract

Disclosed is a leak rate measuring apparatus. According to one embodiment, the leak rate measuring apparatus computing a leak rate of an inner portion of a valve connected to a pipe, comprising: a storage portion storing a table related to a type of the valve, a size of the pipe, and a sound wave size for each flow rate by a leak; an input portion for receiving measurement information for computing the leak rate of the inner portion of the valve; and a computation portion for computing a flow estimation equation by applying a curve fitting to the table, and computing the leak rate by substituting pre-measured target information into the flow estimation equation.

Description

{LEAK RATE MEASURING APPRATUS}

The present invention relates to a leak amount measuring apparatus, and more particularly , to an apparatus for measuring a leak amount with respect to leakage occurring in a pipe.

Conventionally, differential pressure type or air pressure type leak test is performed in air or gas piping. Recently, leak test method using helium gas is also used.

More specifically, in various types of automatic transmission lines, leak test of the flow path of the case is performed in the air pressure differential type after case processing.

However, the conventional and current leak test methods merely confirm whether leaks are generated, and there is a limit that information on the quantities of leaks can not be obtained.

Further, there is a difficulty in calculating the accurate leak amount because the quantitative value of the leak amount varies depending on the type of each valve, the size of the tube connected to the valve, the leaked tube, and the size of the ultrasonic wave.

An object of the present invention is to provide a leak amount measuring apparatus which accurately measures a leak amount of a valve connected to a pipe.

The leak amount measuring apparatus according to an embodiment of the present invention is a leak amount measuring apparatus for calculating a leak amount inside a valve connected to a pipe, A storage unit in which a table is stored; An input part for receiving measurement information for calculating a leak amount inside the valve; A calculation unit for calculating a flow rate estimation equation by applying a curve fitting to the table and calculating a leak amount by substituting the measurement subject information; .

The calculation unit may further include a first calculation unit for calculating a first flow rate estimation equation of the following equation 1 for each of the valve types by applying curve fitting.

[Relation 1]

(y = leak flow rate, x = sound wave size [dB], a, b = first flow rate estimation coefficient by curve fitting)

The calculation unit may further include a second calculation unit for calculating a second flow rate estimation equation of Formula 2 according to the size of the pipe by applying curve fitting to the first flow rate estimation equation and calculating the leakage amount by substituting the measurement subject information .

[Relation 2]

(y = leak flow rate, x = sound wave size [dB], A, B = second flow rate estimation coefficient by curve fitting)

The measurement information may include at least one of a valve type of the valve, a size of a tube connected to the valve, and a size of a sound wave for a tube connected to the valve.

The valve type of the valve and the size of the tube connected to the valve can be input by the user.

The sound wave amplitude for the tube connected to the valve can be received from the sound wave sensing means attached to the tube connected to the valve.

When the sound wave size of the pipe connected to the valve is 5 [dB] or less, the leakage amount can be calculated by the following relational expression (3).

[Relation 3]

(y = leak flow rate, x = sound wave size [dB])

The valve type may be at least one of a ball valve, a union, a joint, a pinhole, a screw, and a gasket.

And a display unit for displaying the calculated leak amount.

Air and gas leaks can be measured precisely to improve measurement quality.

In addition, it prevents leakage of noxious gas due to leak, and it is possible to prevent large-scale safety accident of fire and explosion.

In addition, accurate air or gas leaks can be measured to reduce the resources consumed by air or gas leaks at the steelworks.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an apparatus for measuring leak amount, valves and pipes according to an embodiment of the present invention. Fig.
2 is a block diagram of a leak amount measuring apparatus according to an embodiment of the present invention.
FIG. 3 is a table of the sound wave size according to the flow rate of the union among the valve types in the leak amount measuring apparatus according to the embodiment of the present invention.
FIG. 4 is a graph showing a first flow rate estimation equation to which a curve fitting is applied to a table for a sound wave size according to a flow rate of a union among valve types in a leak amount measuring apparatus according to an embodiment of the present invention.
FIG. 5 is a table of the sound wave size according to the flow rate of the ball valve among the valve types in the leak amount measuring apparatus according to the embodiment of the present invention.
FIG. 6 is a graph showing a first flow rate estimation equation to which a curve fitting is applied to a table of a sound wave size according to a flow rate of a ball valve among valve types in a leak amount measuring apparatus according to an embodiment of the present invention.
FIG. 7 is a graph showing curve fitting applied to the coefficients of the first flow rate estimation equation to calculate the second flow rate estimation equation shown in FIGS. 4 and 6. FIG.
8 is a view showing an example of a display unit of the leak amount measuring apparatus according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

FIG. 1 is a view showing an apparatus for measuring a leak amount, a valve and a pipe according to an embodiment of the present invention, and FIG. 2 is a block diagram of a leak amount measuring apparatus according to an embodiment of the present invention.

1 and 2, a valve B may be connected to a connection portion between a plurality of pipes P, and a regulating portion C for regulating the valve B may be connected to the valve.

And the sound wave sensing means 200 is disposed in the pipe connected to the valve B to sense the sound wave generated from the leak of the valve.

For example, the sound wave sensing means 200 may be a pressure type microphone that changes a change in echo pressure of an acoustic wave into an electric signal. However, the present invention is not limited thereto and can be applied variously.

The leak amount measuring apparatus 100 includes an input unit 110, a storage unit 120, a calculation unit 130, and a display unit 140.

First, the input unit 110 receives the measurement information, which is the information of the measurement object, to calculate the leak amount inside the valve B. The measurement information includes the type of valve, the size of the tube connected to the valve, and the size of the sound waves for the tube connected to the valve.

For example, the valve type may be at least one of a ball valve, a union, a joint, a pinhole, a screw, and a gasket. And, the valve type can be either selected or selected by the manager or user.

In calculating the leak amount, the driving method differs according to the valve type, and the actual leak amount may be different even in the same sound wave size. And the size of the tube connected to the valve is the cross-sectional area of the tube, for example the unit of cross-sectional area may be mm2. However, the present invention is not limited thereto, and various units can be applied.

Further, in calculating the leakage amount, the actual leakage amount may be different depending on the size of the tube. This is because the flow rate is proportional to the cross-sectional area as shown in the following equation (1).

Also, the size of the tube may be entered or selected by the administrator or the user.

Next, the sound wave amplitude for the tube connected to the valve can be received from the sound wave sensing means 200 arranged in the tube. That is, the sound wave size for the tube connected to the valve can be received by the input unit 110 from the sound wave sensing means.

But may also be entered or selected by an administrator or user, such as, for example, valve type and tube size.

The storage unit 120 may store a table for the type of the valve, the size of the pipe, and the sound wave size according to the flow by leakage.

The valve type may be at least one of a ball valve, a union, a joint, a pinhole, a screw, and a gasket as described above.

In addition, the size of the tube is the cross-sectional area of the tube connected to the valve as described above. For example, the unit of the cross-sectional area may be mm 2. However, the present invention is not limited thereto, and various units can be applied.

The sound wave size per flow by leakage is the sound wave amplitude [㏈] measured according to the flow rate. A user or the like can input the data of the plurality of valve types, the size of the valve, and the sound wave size according to the flow rate, and it can be stored in the storage unit 120.

The storage unit 120 is a general data structure implemented in a storage space (hard disk or memory) of a computer system using a database management program (DBMS) (RDBMS) such as Oracle, Informix, Sybase, and DB2, as well as Gemston, Orion, An object-oriented database management system (OODBMS) such as Orion and O2 and an XML Native Database such as Excelon, Tamino, Sekaiju and the like, It can be implemented for the purpose and has the appropriate fields or elements to achieve its function

Next, the calculation unit 130 calculates a flow rate estimation equation by applying a curve fitting to the table stored in the storage unit 120, substitutes measurement target information received from the input unit 110, Can be calculated.

The calculation unit 130 includes a first calculation unit 131 for calculating a first flow rate estimation equation for each valve type by applying a curve fitting, and a second flow rate estimation equation calculation unit for applying a curve fitting to the first flow rate estimation equation according to the size of the pipe, And a second calculation unit 132 for calculating an estimation equation and substituting the measurement object information into the second flow rate estimation equation to calculate the leak amount.

3 is a table of the sound wave size according to the flow rate of the union among the valve types in the leak amount measuring apparatus 100 according to the embodiment of the present invention, FIG. 5 is a graph showing a first flow rate estimation equation to which a curve fitting is applied to a table for a sound wave size according to a flow rate of a union among valve types in the leak amount measuring apparatus 100. FIG. FIG. 6 is a table for the sound wave size according to the flow rate of the ball valve among the valve types in the apparatus 100, and FIG. 6 is a table showing the sound wave size according to the flow rate of the ball valve among the valve types in the leak amount measuring apparatus 100 according to the embodiment of the present invention. FIG. 7 is a graph showing a first flow rate estimation equation to which a curve fitting is applied to a table for the first flow rate estimation, Graph.

3 and 5 illustrate sound waves with respect to a flow rate according to the type of leak stored in the storage unit 120. FIG. Here, the leak type indicates the classification of the valve type and the pipe size. Hereinafter, the sound wave size will be described by the ultrasonic wave size.

3 shows the sound wave size table for each of the tube sizes 20A and 25A for the unions stored in the storage unit 120 and FIG. 5 shows the sound tube size table for the ball valves stored in the storage unit 120 20A and 25A respectively show the sound wave amplitude table for the flow rate.

And the first flow rate estimation equation curve-fitted according to the leak type of FIG. 3 is shown in FIG. 3 and 4, the first calculator 131 calculates the relative ultrasound intensity (relative DB) measured according to the flow rate, which is the ultrasound intensity measured when the flow rate is 0, and the relative ultrasound intensity And the first flow rate estimation equation is calculated by applying curve fitting to the coordinates of the flow rate.

Here, curve fitting is a technique of making a curve or making a function, and estimating a value between function values. There are interpolation and smoothing techniques for curve fitting. At this time, various curve fitting techniques can be applied to the curve fitting in the present invention.

The first calculation unit 131 calculates a first flow rate estimation equation for each leak type through curve fitting. The first flow rate estimation equation is shown in Equation (2).

(y = leak flow rate, x = sound wave size [dB], a, b = first flow rate estimation coefficient by curve fitting)

Similarly to the above description, the first flow rate estimation formula can be calculated for each of the leak types (the ball valve 20A, the ball valve 25A) shown in Figs.

That is, the first flow rate estimation result is a result of approximation of the valve type in the leakage amount measurement.

Next, the second calculation unit 132 performs curve fitting on the coefficients a and b of the first flow rate estimation formula calculated by the first calculation unit 131 according to the pipe size, and calculates a second flow rate estimation .

(y = leak flow rate, x = sound wave size [dB], A, B = second flow rate estimation coefficient by curve fitting)

For example, referring to FIG. 7 (a), the second flow rate estimation equation is a result of curve fitting applied to coefficients a and b of a plurality of first flow rate estimation equations for a tube size in the case of a union.

At this time, in the second calculation section 132, a applies a linear curve fitting to the tube size, and b applies a curve fitting of the power to the tube size.

That is, the coefficient A in the second flow rate estimation equation satisfies the following expression (4).

 (A = coefficient of second flow rate estimation formula by curve fitting, a = coefficient of first flow rate estimation coefficient, C, D = coefficient by curve fitting according to tube size)

Here, C and D are derived from a linear relationship obtained through curve fitting.

In the second flow rate estimation equation, the coefficient A satisfies the following expression (5).

 (B = coefficient of second flow rate estimation formula by curve fitting, b = coefficient of first flow rate estimation coefficient, E, F = b)

Also, E, F are derived from the power relations obtained through curve fitting.

That is, the second flow rate estimation equation is a result of approximation of the pipe size in the leak amount measurement. As a method of calculating the second flow rate estimation equation, a ball valve may be similarly applied as shown in FIG. 7 (b).

In summary, the second flow rate estimation equation obtained by the second calculation unit 132 is an equation in which the approximation of both the valve type and the pipe size is reflected.

Then, the second calculation unit 132 substitutes the measurement object information received from the input unit 110 into the second flow rate estimation equation, and the leak amount is calculated. That is, the leak amount measuring apparatus 100 according to an embodiment of the present invention can provide the user with a quantitative measurement value with respect to an accurate leak quantity considering both the valve type and the pipe size at occurrence of leakage.

In addition, the calculation unit 130 may calculate the leakage amount according to Equation (6) when the sound wave size of the pipe connected to the valve is less than a certain size.

(y = leak flow rate, x = sound wave size [dB])

This is a separate leak amount measurement formula that reflects a minute change in the value in the region where the leak amount is small. In one embodiment, the present invention is applicable to a case where the sound wave size is 5 [dB] or less, and it can be set to various values depending on the valve type and the size of the pipe.

8, which is an illustration of an example of the display unit 140 of the leak amount measuring apparatus 100 according to an embodiment of the present invention, the display unit displays the valve type, the tube size, and the ultrasonic size input from the input unit 110 And the leak amount calculated from the second flow rate estimation formula in the calculation unit 130 is expressed as a leak rate per hour (LPH) and a leak rate per day (Leak rate Per Day). That is, if the leakage amount calculated by the calculation unit 130 is a time unit such as a unit time, a unit, or the like as a flow rate for a predetermined time, a leakage amount of a desired unit can be displayed on the display unit 140.

The display unit 140 may be a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, a three-dimensional display 3D display).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: leak measuring device
110: input unit
120:
130:
131: first calculation unit
132: second calculation section
140:

Claims (9)

A leak amount measuring apparatus for calculating a leak amount inside a valve connected to a pipe,
A storage unit for storing a table of the sound wave size per flow type by the valve type, the tube size, and the leakage;
An input part for receiving measurement information for calculating a leak amount inside the valve; And
A calculation unit for calculating a flow rate estimation equation by applying a curve fitting to the table and calculating a leak amount by substituting the measurement subject information; And a leakage amount measuring device.
The method according to claim 1,
The calculating unit calculates,
Further comprising a first calculation section for calculating a first flow rate estimation equation of the following equation (1) for each of the valve types by applying curve fitting.
[Relation 1]

(y = leak flow rate, x = sound wave size [dB], a, b = first flow rate estimation coefficient by curve fitting)
3. The method of claim 2,
The calculating unit calculates,
Further comprising a second calculation unit calculating a second flow rate estimation equation of Formula 2 according to the size of the pipe by applying curve fitting to the first flow rate estimation equation and calculating a leakage amount by substituting the measurement subject information, Measuring device.
[Relation 2]

(y = leak flow rate, x = sound wave size [dB], A, B = second flow rate estimation coefficient by curve fitting)
The method according to claim 1,
Wherein,
The valve type of the valve, the size of the tube connected to the valve, and the size of a sound wave for the tube connected to the valve.
5. The method of claim 4,
The valve type of the valve and the size of the pipe connected to the valve are input by a user.
5. The method of claim 4,
And the sound wave size of the tube connected to the valve is received from the sound wave sensing means attached to the tube connected to the valve.
5. The method of claim 4,
And when the sound wave size of the pipe connected to the valve is not more than 5 [dB], the leak amount measuring apparatus according to the following relational expression 3 calculates the leak amount.
[Relation 3]

(y = leak flow rate, x = sound wave size [dB])
The method according to claim 1,
Wherein the valve type is at least one of a ball valve, a union, a joint, a pinhole, a screw, and a gasket.
The method according to claim 1,
And a display unit for displaying the calculated leak amount.

Images