KR20160001590U - Apparatus for detecting leakage of double wall pipe by using internal air flow - Google Patents

Apparatus for detecting leakage of double wall pipe by using internal air flow Download PDF

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Publication number
KR20160001590U
KR20160001590U KR2020140008049U KR20140008049U KR20160001590U KR 20160001590 U KR20160001590 U KR 20160001590U KR 2020140008049 U KR2020140008049 U KR 2020140008049U KR 20140008049 U KR20140008049 U KR 20140008049U KR 20160001590 U KR20160001590 U KR 20160001590U
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KR
South Korea
Prior art keywords
flow rate
pipe
tube
air flow
venturi
Prior art date
Application number
KR2020140008049U
Other languages
Korean (ko)
Inventor
윤준영
김태훈
이순기
이재봉
Original Assignee
대우조선해양 주식회사
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Priority to KR2020140008049U priority Critical patent/KR20160001590U/en
Publication of KR20160001590U publication Critical patent/KR20160001590U/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
    • G01M3/283—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes for double-walled pipes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid

Abstract

The present invention relates to an apparatus for measuring the pressure difference of a fluid, which includes an inner tube through which a carrier gas such as hydrogen flows in an inner space and an outer tube surrounding the inner tube and through which an inert gas flows, By including a venturi with a sensor that can be installed, a certain amount of air flow can always be passed between the inner tube and the outer tube. By detecting the flow rate change by using the flow rate of the air flowing between them, It is judged that the inside of the inner pipe is leaked due to the damage of the inner pipe, and when the flow rate is decreased, it is judged that the air is leaked to the outside air from the outer pipe due to the damage of the sealed state of the outer pipe. To a double damper sealed damage detection device using an internal air flow capable of achieving an effect .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double-

More particularly, the present invention relates to a double pipe sealing damage detection apparatus using internal air flow, more specifically, by detecting flow rate change by using a flow rate of air flowing through a double pipe composed of an inner pipe and an outer pipe, The present invention relates to a double pipe sealing damage detection device using an internal air flow capable of detecting damage to a pipe.

Pipes used to handle flammable / toxic materials can be accompanied by serious personal / environmental / property damage when leaking. Therefore, it is widely used to reduce the probability of leakage by making pipes in main areas as double pipes composed of inner pipe and outer pipe .

1 is a schematic view of a conventional double pipe leakage inspection apparatus.

At this time, when leakage occurs from the inner pipe, the concentration of the combustible gas (or other toxic gas) is measured in the space between the inner pipe and the outer pipe as shown in FIG. 1 to detect leakage of the inner pipe.

Conventional systems, however, can detect leaks from internal pipes, but can detect when an external pipe is damaged due to external shock or aging without leakage from the internal pipe There was no problem.

Korea Patent Office Registration No. 10-1049429

In order to solve the above problem, in the present invention, a certain amount of air flow is always passed between the inner pipe and the outer pipe, and the flow rate is always detected using the flow rate of the air flow. The internal pipe is judged to be leaked to the external pipe, and when the flow rate is decreased, it is judged that the air is leaked from the external pipe to the outside air because the sealed state of the external pipe is damaged, And to provide a sealed damage detection device.

In order to attain the above object, the present invention provides an internal combustion engine comprising an inner pipe through which a carrier gas such as hydrogen flows in an inner space, and an outer pipe surrounding the inner pipe and through which an inert gas flows, And a venturi provided with a sensor capable of measuring a pressure difference of the fluid.

A venturi is provided between the expansion portion formed on the inlet side of the outer tube and the shaft tube portion formed on the outlet side and the pressure difference between the flow rate measured at the expansion portion and the flow rate measured at the shaft portion by the sensor formed inside the venturi .

In this case, the expanding portion and the shaft portion reduce the cross-sectional area of the portion to measure the flow velocity, thereby increasing the flow velocity, thereby reducing errors due to noise of the sensor.

The double pipe sealing damage detection device using the internal air flow according to the present invention allows a constant amount of air flow to always pass between the inner pipe and the outer pipe and detects the flow rate change by using the flow rate of the air flowing between , When the flow rate is increased, it is judged that the inner pipe is hermetically sealed and the material inside the inner pipe is leaked to the outer pipe. If the flow rate is decreased, the outer pipe is hermetically sealed and air leaks from the outer pipe It is possible to detect the damage of the outer pipe as well as the inner pipe.

1 is a schematic view of a conventional double pipe leakage inspection apparatus.
FIG. 2 is a view schematically showing a double pipe sealing damage detection apparatus using an internal air flow according to an embodiment of the present invention, and FIG.
FIG. 3 is a graph schematically illustrating a range of flow rate / flow rate measured through a double pipe airtightness damage detection apparatus using an internal air flow according to an embodiment of the present invention,
FIG. 4 is a block diagram schematically illustrating a method of using a double pipe sealing damage detection apparatus using an internal air flow according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals will be used to designate the same or similar components in the drawings, unless they are indicated on other drawings. Detailed descriptions of known functions and configurations are omitted.

FIG. 2 is a schematic view of a double pipe sealing damage detection apparatus using an internal air flow according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a double pipe sealing damage detection apparatus using an internal air flow according to an embodiment of the present invention. FIG. 4 is a block diagram schematically illustrating a method of using a double pipe sealing damage detection apparatus using an internal air flow according to an embodiment of the present invention. FIG. 4 is a graph schematically showing a range of a flow rate / to be.

As shown in FIG. 2, the present invention includes an inner tube 10 in which a carrier gas such as hydrogen flows in an inner space, and an outer tube 20 surrounding the inner tube 10 and having an inert gas flowing therein ≪ / RTI &

And a venturi 30 provided at one side of the outer tube 20 and equipped with a sensor 40 for measuring the pressure difference of the fluid.

The present invention consists of a double piping including an inner pipe 10 and an outer pipe 20. A carrier gas such as hydrogen is circulated in the inner space of the inner pipe 10, So that the inert gas can be circulated in the outer space of the fuel cell stack 20.

In addition, the inner tube 10 and the outer tube 20 have a concentric circular structure.

A venturi 30 is provided between the tube portion 21 formed at the inlet side of the outer tube 20 and the shaft tube portion 22 formed at the outlet side and the inner tube 10 and the outer tube The inner diameter of the inner tube 10 and the outer diameter of the inner diameter of the axial tube portion 22 are made larger than the inner diameter of the inner tube 10, The sensor 40 formed inside the venturi 30 has a relatively high air flow rate due to a relatively small space between the outer tube 20 and the relatively high flow rate. As a result, the inner air pressure is relatively low, So that the pressure difference can be measured. On the other hand, by reducing the flow velocity to a cross-sectional area of a portion to be measured, an error due to the noise of the sensor 40 can be reduced by increasing the flow velocity.

First, each variable for measuring the flow rate will be described. The pressure, the velocity and the cross-sectional area in the tube portion 21 are P1, V1 and A1, respectively, and the pressure, the speed and the cross-sectional area in the shaft portion 22 are P2, V2 and A2, respectively.

Figure utm00001

Assuming that the tube is horizontally installed from the Webernoy's equation and the potential energy is the same, the density of the fluid is not changed, and the fluid velocity at the tube section 21 is very slow, assuming that the fluid velocity at the tube section 22 is .

Figure utm00002

Therefore, if the differential pressure sensor 40 senses the pressure difference P between P1 and P2 and obtains the velocity at the venturi 30, the flow rate can be obtained from the equation Q = AV.

If the flow rate / flow rate range that can be generated on the average is 0 to 10, as shown in FIG. 2, if the flow rate / flow rate range is less than 0, It is determined that the air due to the airtight damage of the inner tube 10 is leaking to the outside air. If it is 10 or more, the inner tube 10 is judged as a leaked gas to the outside space due to the sealing damage.

4, it is possible to define a range of the flow rate / flow rate that can be generated on the average in the operating state (s10), and to determine the range of the gas flow rate of the inner tube 10 and the outer tube 20 The sensor 40 can measure the pressure difference of the flow rate measured in the pipe section 21 and the shaft section 22. If it is determined that the sensed flow rate / flow rate is in the defined range (s30) If it is within the defined range, it is determined that there is no pipe damage, and it is judged whether it is outside the defined range and higher than the defined range (s40).

If it is higher than the defined range, it is determined that the inner tube 10 is damaged and an alarm is generated. Otherwise, it is determined whether the inner tube 10 is lower than the defined range (s50).

At this time, when the measured pressure difference is lower than the defined range, it is determined that the appearance 20 is damaged and an alarm can be generated.

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

10: inner tube 20: outer tube
30: Venturi 40: Sensor

Claims (3)

An inner tube through which a carrier gas such as hydrogen flows in an inner space and an outer tube surrounding the inner tube and through which an inert gas flows,
Further comprising a venturi disposed at one side of the outer tube and equipped with a sensor capable of measuring a pressure difference of the fluid.
The method according to claim 1,
A venturi is provided between an expansion portion formed on the inlet side of the outer tube and an axial tube portion formed on the outlet side and a pressure difference between the flow rate measured at the expansion portion and the flow rate measured at the shaft portion is measured by a sensor formed inside the venturi Wherein the internal air flow is used to detect the airtight damage of the double pipe.
The method according to claim 1,
Wherein the expansion portion and the shaft portion reduce the cross-sectional area of the portion for measuring the flow velocity to increase the flow velocity, thereby reducing an error due to the noise of the sensor. .
KR2020140008049U 2014-11-05 2014-11-05 Apparatus for detecting leakage of double wall pipe by using internal air flow KR20160001590U (en)

Priority Applications (1)

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Applications Claiming Priority (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10495542B2 (en) 2016-11-30 2019-12-03 Rolls-Royce Deutschland Ltd & Co Kg Monitoring system and method for a multiple-walled fluid system
KR20230027800A (en) * 2021-08-20 2023-02-28 이종민 Control valve integrated with leakage detecting means

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10495542B2 (en) 2016-11-30 2019-12-03 Rolls-Royce Deutschland Ltd & Co Kg Monitoring system and method for a multiple-walled fluid system
KR20230027800A (en) * 2021-08-20 2023-02-28 이종민 Control valve integrated with leakage detecting means

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