JP2004093539A - Fluid leak testing method and fluid leak tester device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely determine the presence or absence of leak irrespective of a variation in the atmospheric pressure even if the pressure of fluid is as small as below the atmospheric pressure. <P>SOLUTION: This fluid leak tester device 1 for inspecting the presence or absence of the leak of air flowing through the inside of a pipe comprises an atmospheric pressure sensor 2, a fluid pressure sensor 3 detecting the pressure of the air in the pipe 10, and a calculation part 4 connected to the output parts of the atmospheric pressure sensor 2 and the fluid pressure sensor 3. Since the calculation part 4 are connected to the output parts of the atmospheric pressure sensor 2 and the fluid pressure sensor 3 through an interface circuit 6 and the detection signals of the atmospheric pressure sensor 2 and the detection signals of the fluid pressure sensor 3 are inputted therein, these detection signals are compared with each other to determine whether the air leaks or not from the inspected pipe 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and a device 1 for detecting a leak of a fluid flowing in a pipe, and more particularly to a technique suitable for use in an automatic pressure control device 1.
[0002]
[Prior art]
In piping systems that handle fluids such as air, if air leaks, so-called air leaks, can cause serious accidents, it is necessary to perform periodic inspections to determine the presence or absence of leaks. is there.
At that time, when determining whether or not there is an air leak, generally, the determination is made by measuring the pressure of the air in the pipe to be inspected with a pressure gauge, or the liquid is sealed in the pipe to be inspected and the liquid leaks out. There is a technique for making a judgment by observing the appearance.
[0003]
[Problems to be solved by the invention]
However, in the inspection method described above, when the pressure of the air to be handled is large, the pointer of the pressure gauge is activated immediately or the fluid is blown out to the outside. When a small pressure fluctuation such as the atmospheric pressure or less occurs, it is difficult to determine whether or not there is a leak.
In addition, it was not possible to specify whether a minute pressure fluctuation of the fluid was a leak caused by piping or an influence of fluctuations in temperature and pressure.
[0004]
An object of the present invention is to provide a fluid leak tester method that can reliably determine the presence or absence of a pressure leak even when the pressure of the fluid to be handled is a minute pressure equal to or lower than the atmospheric pressure in view of the above-described problems of the related art. It is another object of the present invention to provide a fluid leak tester device capable of appropriately performing the above method.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following solutions.
The invention according to claim 1 is a fluid leak tester method for detecting the presence or absence of a leak of a fluid flowing through a pipe to be inspected, wherein a change in atmospheric pressure and a change in fluid pressure in the pipe to be inspected are performed within the same time. It is characterized in that the presence or absence of a fluid pressure leak in the inspected tube is determined by comparing.
According to the present invention, the presence or absence of air pressure leak in the inspected tube is determined by comparing the change in the air pressure in the inspected tube with the change in the atmospheric pressure within the same time. Even if the leak is very small, the presence or absence of the leak can be accurately and automatically determined, and the minute leak in the tube to be inspected can be satisfactorily inspected regardless of the change in the atmospheric pressure.
[0006]
The invention according to claim 2 is a fluid leak tester device for detecting the presence or absence of a leak of a fluid flowing in a pipe to be inspected, wherein a change in atmospheric pressure and a change in fluid pressure in the pipe to be inspected are performed within the same time. It is characterized in that it is provided with a judging means for judging a leak of the fluid pressure by comparing.
According to the present invention, there is provided an atmospheric pressure sensor, a fluid pressure sensor for detecting the pressure of air in the pipe to be inspected, and a calculation unit for determining the presence or absence of a leak based on the detection of the atmospheric pressure sensor and the fluid pressure sensor. With this configuration, it is possible to determine the presence or absence of air pressure leak in the inspected tube by comparing the change in the air pressure in the inspected tube with the change in the atmospheric pressure within the same time. The invention can be carried out appropriately.
[0007]
According to a third aspect of the present invention, in the fluid leak tester according to the second aspect, the determination unit includes an atmospheric pressure sensor that detects an atmospheric pressure, and a fluid pressure sensor that detects a fluid pressure sealed in the pipe to be inspected. An arithmetic unit for comparing a change in atmospheric pressure by the atmospheric pressure sensor with a change in fluid pressure by the fluid pressure sensor, and determining whether there is a leak in the fluid pressure based on the comparison result. I do.
According to the present invention, since the determination unit includes the atmospheric pressure sensor, the fluid pressure sensor, and the calculation unit, it is possible to accurately determine whether there is a fluid pressure leak in the inspected pipe.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing a fluid leak tester device 1 to which a fluid leak tester method according to one embodiment of the present invention is applied.
The fluid leak tester device 1 shown in FIG. 1 is for inspecting the presence or absence of a leak of air flowing through a pipe in a pipe system, and is roughly divided into an atmospheric pressure sensor 2 and a pipe to be inspected (a pipe to be inspected). (Abbreviated as) 10, a fluid pressure sensor 3 for detecting the pressure of the air in 10, and an arithmetic unit 4 connected to the output unit of the atmospheric pressure sensor 2 and the fluid pressure sensor 3.
[0009]
The atmospheric pressure sensor 2 has an introduction port 5 opened to the outside, and detects the current atmospheric pressure by introducing air from the introduction port 5. The introduction port 5 is used by removing a cap (not shown) attached when not in use.
[0010]
The fluid pressure sensor 3 is installed so as to be able to detect the air pressure inside the pipe 10 to be inspected. At the time of inspection, the test pipe 10 is filled with air at a predetermined pressure through the supply port 11. The atmospheric pressure sensor 2 and the fluid pressure sensor 3 are selected in a range (for example, KPa) that can measure a pressure lower than the atmospheric pressure.
[0011]
The arithmetic unit 4 includes a central processing unit (CPU) connected to the output units of the atmospheric pressure sensor 2 and the fluid pressure sensor 3 via the interface circuit 6, and detects the detection signal of the atmospheric pressure sensor 2 and the fluid pressure sensor. When the detection signal of No. 3 is input, the two are compared to determine whether or not air is leaking from the test pipe 10.
[0012]
More specifically, after air of a predetermined pressure is sealed in the inspection pipe 10, a certain time such as 10 minutes or 30 minutes elapses therefrom, and a change in the atmospheric pressure within the certain time, By comparing the change with the air pressure in the test pipe 10, the presence or absence of air leak in the test pipe 10 is detected. In this case, when the air pressure in the inspection pipe 10 changes in accordance with the change in the atmospheric pressure, it is determined that there is no air leak, and when the air pressure gradually decreases regardless of the change in the atmospheric pressure. Determines that a leak has occurred. A display unit 7 is connected to the calculation unit 4 so that the display unit 7 displays the determination result of the calculation unit 4. Such a fluid leak tester device 1 has such a size and weight that the inspector can carry it alone as a whole.
[0013]
Since the fluid leak tester device 1 of this embodiment is configured as described above, its handling will be described next.
At the time of inspection, the inspector supplies air of a predetermined pressure into the inspected tube 10 from the supply port 11 and seals the same, and the fluid pressure sensor 3 is attached to the inspected tube 10 so as to be detectable. The introduction port 5 is opened, and the inspection (airtightness test) is started in this state.
[0014]
Then, a predetermined time set in advance elapses, and a change in the atmospheric pressure within that time is detected by the atmospheric pressure sensor 2, and a change in the air pressure in the inspection pipe 10 is also detected by the fluid pressure sensor 3, When the detection signal is input to the arithmetic unit 4 via the interface circuit 6, the arithmetic unit 4 determines.
[0015]
The arithmetic unit 4 captures the data detected by the atmospheric pressure sensor 2 and the fluid pressure sensor 3 by transmitting the data instantaneously in real time, and determines the presence or absence of a leak based on each data. . That is, when the air pressure in the inspection pipe 10 changes in accordance with the change in the atmospheric pressure, the calculation unit 4 determines that there is no air leak in the inspection pipe 10, but regardless of the change in the atmospheric pressure. When it gradually decreases, it is determined that a leak has occurred, and the determination result is displayed on the display unit 7.
[0016]
Therefore, according to the method of the present invention, the change in air pressure in the test pipe 10 and the change in atmospheric pressure are compared, and the presence or absence of air pressure leak is determined based on the change in atmospheric pressure. Even if the leak of the air of the sample 10 is minute, the leak of the sample tube 10 can be accurately and automatically determined, and the small leak in the sample tube 10 can be determined irrespective of the change in the atmospheric pressure. Can be inspected.
[0017]
Further, according to the fluid leak tester device 1 of this embodiment, the atmospheric pressure sensor 2, the fluid pressure sensor 3 for detecting the pressure of the air in the inspection pipe 10, and the detection of the atmospheric pressure sensor 2 and the fluid pressure sensor 3 The configuration includes the calculation unit 4 that determines the presence or absence of a leak based on the above, so that the above method can be performed accurately.
Moreover, as described above, the reference to be compared is the atmospheric pressure, and the presence or absence of air leakage is determined based on the atmospheric pressure. Therefore, the entire fluid leak tester device 1 can be easily configured, Accurate determination can be made with a simple configuration.
[0018]
In the illustrated embodiment, an example in which the invention is applied to a piping system through which air is circulated as the inspection target tube 10 is shown. Of course, the effect can be obtained.
[0019]
【The invention's effect】
As described above, according to the present invention, it is determined whether or not there is a leak of air pressure in the test pipe by comparing the change in air pressure in the test pipe with the change in atmospheric pressure within the same time. Even if the leak of air in the test tube is minute, the presence or absence of the leak can be accurately and automatically determined, and the minute leak in the test tube can be inspected well regardless of changes in atmospheric pressure. The effect that can be obtained is obtained.
[0020]
According to the second aspect, it is possible to determine the presence or absence of air pressure leak in the inspected tube by comparing the change in the air pressure in the inspected tube with the change in the atmospheric pressure within the same time. Thus, the effect that the invention according to the first aspect can be properly implemented is obtained.
[0021]
According to the third aspect, since the determination means includes the atmospheric pressure sensor, the fluid pressure sensor, and the calculation unit, it is possible to accurately determine whether there is a fluid pressure leak in the inspected pipe. Can be
[Brief description of the drawings]
FIG. 1 is an overall view showing a fluid leak tester device to which a fluid leak tester method according to an embodiment of the present invention is applied.
[Explanation of symbols]
1 Fluid leak tester device 1
2 Atmospheric pressure sensor 3 Fluid pressure sensor 4 Operation unit 7 Display unit 10 Inspection

Claims (3)

A fluid leak tester method for detecting the presence or absence of a leak of a fluid flowing through a pipe to be inspected,
A liquid leak tester method, wherein a change in atmospheric pressure and a change in fluid pressure in the pipe to be inspected are compared within the same time to determine whether there is a leak in fluid pressure in the pipe to be inspected. A fluid leak tester device for detecting the presence or absence of a leak of a fluid flowing through a pipe to be inspected,
A fluid leak tester device, comprising: a judging means for judging a fluid pressure leak by comparing a change in atmospheric pressure with a change in fluid pressure in the inspected pipe within the same time. The air leak tester device according to claim 2,
The determination means includes an atmospheric pressure sensor that detects an atmospheric pressure, a fluid pressure sensor that detects a fluid pressure sealed in the pipe to be inspected, a change in atmospheric pressure by the atmospheric pressure sensor, and a fluid pressure by the fluid pressure sensor. And a computing unit that compares the change of the fluid pressure and determines whether there is a fluid pressure leak based on the comparison result.

Images