JP2004053567A - Method and device for inspecting leakage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, when a method of confirming the presence/absence of leakage from the occurring states of bubbles by sending compressed air into an object from which the state of leakage is to be confirmed and applying soap-and-water to a portion to be inspected of the object is used, it sometime happens that leakage is not confirmed at shadow portions out of eyeshot, because the method largely rely upon the ability of a worker and, when a method of confirming the presence/absence of leakage from the occurring states of bubbles from a portion to be inspected by sinking the object in water is used, the size of the used device becomes larger when the object is large in size though the method little rely upon the skill of the worker. <P>SOLUTION: The presence/absence of leakage is confirmed by sending a smelly gas 52 into the object 60 in a pressurized state together with compressed air and detecting the presence/absence of the smelly gas 52 on the outside of the object 60. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a leakage inspection method and a leakage inspection apparatus, and more particularly, to a leakage inspection method that can be easily inspected by anyone with a simple configuration even for an inspection object for which a large leakage situation is to be confirmed. And technology related to a leak inspection device.
[0002]
[Prior art]
Conventionally, as one technique related to a leak inspection method and a leak inspection apparatus, compressed air is sent to an inspection object to check a leak situation, and a part to be inspected, for example, a connection part of a hose and a joint, for example, is sprayed with soapy water. The presence or absence of leakage was checked based on the state of foam generation.
[0003]
In addition, as another technique, compressed air is sent to the inspection object whose leakage status is to be checked, the part to be inspected is submerged in water, and the presence or absence of leakage is checked by the state of bubbles generated in the part to be inspected. Was.
[0004]
[Problems to be solved by the invention]
However, there are the following problems with such conventional techniques of the leakage inspection method and the leakage inspection apparatus.
[0005]
First, the method of sending compressed air to the inspection object to check the state of leakage, applying soapy water to the part to be inspected, and checking for the presence or absence of leakage based on the state of bubble generation, requires the skill of the worker. There were many situations where we depended on it, and sometimes we couldn't see any leaks in the shadows, which were hard to reach.
[0006]
Secondly, in the method of sending compressed air to the inspection object to check the leakage situation, submerging the inspection object to check the leakage state in water, and checking for the presence or absence of leakage by the occurrence of bubbles in the part to be inspected, There are few scenes that rely on the skill of the worker, but on the other hand, there is an inconvenience that the apparatus becomes large for an inspection object for which it is desired to confirm a large leak situation.
An object of the present invention is to solve such a problem.
[Means for Solving the Problems]
According to the present invention, the odorous gas 52 is sent to the inside of the inspection object 60 whose leakage state is to be confirmed while being pressurized together with the compressed air, and the odorous gas is received from the outside of the inspection object 60 whose leakage state is to be confirmed. It is characterized in that a leak is determined by detecting whether or not the presence of the gas 52 has been detected, and further, the odorous gas 52 is produced by supplying compressed air to the odorous substance 51. This has solved the above problem.
[0008]
Further, in the present invention, it is desired to confirm a compressed air pipe 101, 102, 103, 104, 105 capable of introducing compressed air, a storage container 50 storing an odorous substance 51 generating an odorous gas 52, and a state of leakage. The test object 60 is connected in the order described so that the compressed air reaches the inside of the test object 60 for which the condition of the leak is to be confirmed, and the odorous gas 52 is connected to the outside of the test object 60 for which the condition of the leak is to be confirmed. A leak condition is determined by arranging an odor detector 70 for detecting the presence of the odor detector. Further, compressed air is supplied to any of the compressed air pipes 101, 102, 103, 104 and 105. The above problem has been solved by providing a dryer 20 for drying.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
A leakage inspection method and a leakage inspection apparatus according to the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is a diagram showing a leak inspection apparatus of the present invention.
[0010]
As shown in FIG. 1, reference numeral 10 denotes an air compressor, which is not specifically shown, includes a motor, a compressor, and a tank, and transmits the rotation of the motor to the compressor by a belt to release the atmosphere. Compressed air is stored in the tank while taking in.
[0011]
Here, the compressed air generated by the air compressor 10 includes an on-off valve 15 that can manually open and close the flow of the compressed air, a compressed air pipe 101, a dryer 20 for drying the compressed air, and a compressed air pipe 102. A dust filter 30 for removing dust from compressed air, a compressed air pipe 103, a mist filter 40 for removing oil from compressed air, and a compressed air pipe 104, which can manually open and close the flow of compressed air. Dry and clean compressed air can be supplied to the storage container 50 via the on-off valve 55 and the compressed air pipe 105.
[0012]
However, some kind of dust filter may be provided between the air compressor 10 and the dryer 20, only one of the dust filter 30 and the mist filter 40 may be provided, or just downstream of the dust filter 30 and the mist filter 40. Another filter having a high filtering ability for removing odors, pigments or fungi may be further added to any position of the compressed air pipe 104. In addition, as for the order of disposition, it is general to dispose the components in order from low to high in filtering ability from upstream to downstream.
[0013]
In this case, in the dryer 20, the compressed air is cooled to be dewed by cooling to generate drain water, and the generated drain water is used to open and close the drain discharge pipe 201 and the flow of the drain water. The compressed air is dried by discharging through the drain 25, the drain discharge pipe 202, and the drain trap 26. However, the dryer 20 is not limited to a cooling method, but may be any other method such as a method of passing through a separation membrane or a method of passing a drying agent.
[0014]
The drain water in the drain trap 26 is always discharged for a predetermined time in a predetermined cycle. Alternatively, the presence or absence of the drain water is determined at any position from the dryer 40 to the drain trap 26. It is conceivable to perform the operation for a predetermined time only when confirming and confirming the presence of drain water. At this time, immediately after the drain water is drained, if the presence of the drain water is further confirmed, the drain water may be discharged for a further predetermined time.
[0015]
Also, the dust filter 30 and the mist filter 40 can discharge the generated drain water through the drain discharge pipes 203 and 204 and the on-off valves 35 and 45 that can open and close the flow of the drain water. It has become. Of course, it is also conceivable to provide the drain trap under the same conditions as the dryer 20.
[0016]
Here, as for the storage container 50 to which dry and clean compressed air is supplied, a particulate odor substance 51 is stored, and the compressed air is supplied so that the gas smells more than the odor substance 51. 52, a compressed air pipe 106, an on-off valve 56 that can manually open and close the flow of compressed air, a compressed air pipe 107 integrated with the joint 65, and a compressed air pipe 108 integrated with the joints 66 and 67. A test object 60 for checking the state of leakage, which is a hose 61 integral with the joints 62 and 63; a compressed air pipe 109 integral with the joint 68; and an on-off valve 69 capable of manually opening and closing the flow of compressed air. Has been reached.
[0017]
In this case, the inspection object 60 for which the situation of the leakage is desired to be confirmed is not limited to the hose 61 integrated with the joints 62 and 63, but is not limited to the leakage to various screw portions, the one using packing or a sealing agent, or the box. It is possible to deal with any kind of inspection object such as leakage of a shape-like object.
[0018]
Although not specifically shown in FIG. 1, the pressure control is performed at any one of the compressed air pipe 106, the compressed air pipe 107 integrated with the joint 65, and the compressed air pipe 108 integrated with the joints 66 and 67. It is also conceivable to provide a valve, close the on-off valve 56 when the set pressure is reached, or stop the operation of the compressor 10. Here, a value of 0.1 to 1 MPa can be considered as the set pressure.
[0019]
Further, with regard to the odor substance 51, a substance that emits an odor is impregnated into vinyl chloride or various plastics, and the resulting substance is stored in the storage container 50. In this case, the shape is not limited to the particle shape, but may be a cloth shape, a string shape, or another shape. Further, regarding the odor substance 51, it is conceivable that the odor substance is impregnated into the silica gel.
[0020]
In addition, as for the storage container, instead of a method of providing an inlet and an outlet connected to the compressed air pipes 105 and 106 as shown in FIG. 1, only the outlet is connected in the middle of the pipe via an on-off valve, A liquid or gas that emits an odor is stored in the storage container, and the on-off valve is opened only when a leak is inspected, and the odor released from the storage container to the pipeline via the on-off valve is checked. It is also conceivable to send the gas to be inspected together with the compressed air to the inside of the inspection object 60 for which it is desired to check the state of leakage.
[0021]
In addition, the joints 67 and 68 need to be appropriately arranged in accordance with the connection of the inspection object 60 whose leakage state is to be checked. In addition, the on-off valve 69 may use a blind plug.
[0022]
On the other hand, an odor detector 70 for detecting the odorous gas 52, which is composed of a sensor 72, a connecting portion 75, and a detector 71, is provided outside the inspection object 60 for which the situation of the leak is to be checked. . In this case, the odor detector 70 detects when the odorous gas 52 leaks from any part inside the inspection object 60 for which the situation of the leakage is to be confirmed.
[0023]
The leakage inspection method and the leakage inspection apparatus according to the present invention are configured as described above, and the operation thereof will be described below in detail.
[0024]
First, the odor substance 51 is stored in the storage container 50, and the compressed air pipe 108 integrated with the joints 66 and 67 and the compressed air pipe 109 integrated with the joint 68 are arranged in accordance with the inspection object 60 whose leakage state is to be checked. . Further, the opening / closing valves 15, 55, 56 are opened, and the opening valves 69, 25, 35, 45 are closed.
[0025]
Next, when the motor constituting the air compressor 10 is operated, the rotation of the motor is transmitted to the compressor by a belt to produce compressed air in the tank.
[0026]
The produced compressed air is supplied to the on-off valve 15, the compressed air pipe 101, the dryer 20, the compressed air pipe 102, the dust filter 30, the compressed air pipe 103, the mist filter 40, the compressed air pipe, and the like. Dry and clean compressed air can be sent to the storage container 50 via the 104, the on-off valve 55, and the compressed air pipe 105.
[0027]
On the other hand, in the storage container 50, when compressed air is supplied to the odorous substance 51, an odorous gas 52 is released, and the odorous gas 52 is compressed with the compressed air pipe 106, the on-off valve 56, and the joint 65. Through an air pipe 107 and a compressed air pipe 108 integrated with the joints 66 and 67, the air reaches the inside of the inspection object 60 where the state of leakage is desired to be confirmed.
[0028]
In addition, when compressed air is supplied to the odor substance 51, there is a problem that if the temperature of the compressed air is high, the odor impregnated in the odor substance 51 is released in a short time. This is solved by cooling the compressed air. Also, when the humid compressed air flows to the inspection object 60 for which the condition of the leak is to be checked, there is a case where a problem that the dewed water droplet blocks the leaked portion is caused. The problem is solved by sending dry compressed air.
[0029]
In this case, if there is a leak in the inspection object 60 whose leakage status is to be confirmed, the odor inspection device 70 senses the odor, and if there is no leakage in the inspection object 60 whose leakage status is to be confirmed, the odor inspection device 70 has the odor. It does not show any sense of
[0030]
In this manner, the operation, stop, and opening and closing of the on-off valves 55 and 56 of the air compressor 10 and the exchange of the inspection object 60 whose leakage state is desired to be confirmed are repeated. As a result, anyone can easily inspect the inspection object 60 for which many leak situations are desired to be confirmed.
[0031]
【The invention's effect】
As is apparent from the above description, the following effects can be obtained by the present invention.
[0032]
First, it is not necessary to prepare a large device for an inspection object for which a large leak situation is to be confirmed, and it is possible to perform measurement with the same device for all the inspection objects for which the leakage situation is to be confirmed. .
[0033]
Second, as for the technology at the time of the measurement, so much skill was not required, and a certain degree of accuracy could be secured.
[0034]
Third, by arranging a dryer upstream of the storage container, it is possible to dry the compressed air and at the same time lower the temperature of the compressed air. In addition, it is possible to prevent the portion from being closed, and in addition, it is possible to continuously release gas that is more odorous than the odorous substance stored in the storage container for a long time.
[Brief description of the drawings]
FIG. 1 is a diagram showing a leakage inspection apparatus according to the present invention.
10 Air compressor 15 Open / close valve 20 Dryer 25 Open / close valve 26 Drain trap 30 Dust removal filter 35 An on-off valve 40, a mist filter 45, an on-off valve 50, a storage container 51, an odorous substance 52, an odorous gas 55, ··································· Inspection object 61 ·········································································································································· Joint ... Joint 66 ... Joint 67 ... Joint 68 ... Joint 69 On-off valve 70 ... Odor detector 71 ... Detection Sensor 72 Sensor 75 Connection 101 Compressed air piping 102 Compressed air piping 10 Compressed air piping 104 Compressed air piping 105 Compressed air piping 106 Compressed air piping 107 Compressed air piping 108 Compressed air piping 109 ..Compressed air piping 201..Drain discharge pipe 202 ... Drain discharge pipe 203..Drain discharge pipe 204 ... Drain discharge pipe

Claims (4)

The odorous gas (52) is sent to the inside of the inspection object (60) whose leakage state is to be confirmed while being pressurized together with the compressed air, and the odor gas (52) is sent from outside the inspection object (60) whose leakage state is to be confirmed. A method for inspecting leakage based on whether the presence of a gas (52) is detected. The leak inspection method according to claim 1, wherein the odorous gas (52) is generated by supplying compressed air to the odorous substance (51). A compressed air pipe (101, 102, 103, 104, 105) capable of introducing compressed air, a storage container (50) containing an odorous substance (51) generating an odorous gas (52), and a state of leakage Are connected in the stated order so that the compressed air reaches the inside of the inspection object (60) whose leakage state is to be checked, and the inspection object (60) whose leakage state is to be checked is A leak inspection apparatus characterized in that a leak condition is determined by disposing an odor detector (70) for detecting the presence of the odorous gas (52) on the outside. The leak inspection apparatus according to claim 3, wherein a dryer (20) for drying the compressed air is disposed at any position of the compressed air pipe (101, 102, 103, 104, 105).

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