WO2009157092A1

WO2009157092A1 - Airtightness inspection method and airtightness inspection device whose inspection object is box body for attaching steam movement controller

Info

Publication number: WO2009157092A1
Application number: PCT/JP2008/061796
Authority: WO
Inventors: 溝部　都孝
Original assignee: 株式会社九州山光社
Priority date: 2008-06-23
Filing date: 2008-06-23
Publication date: 2009-12-30

Abstract

An airtightness inspection technique of enabling an airtightness leakage place in a box body or the like, which has a simple structure and ensures the safety to be reliably found and identified at low cost. An airtightness inspection device comprises a smoke container (2) for holding dry ice (D), a water tank (3), an attachment hole (91) formed in a box body (K) in order to attach a steam movement controller (S), a water passage (4) for connecting the smoke container and the water tank, and a pump (5) for pressurizing the inside of the box body. The airtightness inspection device supplies water into the smoke container to allow the smoke from the dry ice and pneumatically pressurizes the inside of the box body or the like with the white smoke filled to leak the white smoke from the airtightness leakage place. The airtightness inspection device finds and identifies the airtightness leakage place by visually observing the leaked white smoke.

Description

Description Airtightness inspection method and airtightness inspection device for a box for mounting a water vapor movement control device Technical Field

The present invention relates to a box or container for mounting a water movement control device used as a dew condensation prevention device or the like by controlling the movement direction of water vapor with a special film body and its arrangement. (Hereinafter referred to as “box, etc. J”)

The water vapor movement control device utilizes the breathing phenomenon of the box etc. caused by the temperature change, intervenes in the breathing process between the internal air and the outside air of the box etc. caused by this breathing phenomenon, the box etc. (See Japanese Patent Laid-Open No. 5-3220600)

Since the water movement control clothes are attached to a box or the like, one of the vents communicates with the inside of the box or the like, and the other vent P is opened to the atmosphere. Between the two vents A plurality of chambers are defined by a permeable and moisture permeable membrane.

Then, using the air permeability and moisture permeability of each membrane body, the movement of water vapor is controlled so as to adjust the humidity inside the box body according to the temperature fluctuation speed of the outside air and the box body.

This water vapor movement control device has a fail-safe drainage mechanism that avoids the accumulation of moisture in the box, etc., and contributes to improving the safety of the box, etc.

The water vapor movement control device functions as an airtight maintenance of the box. In other words, in order to use the steam movement control device for a box or the like (for example, an electric box) that is actually operated, in order to utilize a breathing phenomenon utilizing a change in ambient temperature, the box It is necessary to ensure the tightness of the outside air and the ability to shut off (airtightness) is the need for a dehumidifying environment in the box

Assuming that the outside air is at 100% RH at 5% R Η, the inside of the box is pressurized from the outside air at a water pressure of 45% RH. In the vicinity of 0 X, it is a weak pressure change equivalent to about 10 to 20 cm water column pressure.

Paradoxically, the water vapor ¾ movement control device is closed against the box

¾_ Β £ If there is a large feature, it can be applied even if it is in a rough dense state, on the other hand, the presence of a large air passage (airtight leakage place) condenses by stirring the air in the box etc. There is no preventive function, so you need to deal with it carefully.

In general, boxes used as EJ; often have doors that are poorly installed, and there are many large air passages (tight leaking places) in the passages, etc., and water movement control For the purpose of achieving a reliable effect and safe use of the device, a close inspection method is required to identify the leak location.

The present applicant has proposed ¾; two proposals for a precision inspection device for confirming the airtight state of a box or the like on which a water movement control clothing is attached (W

参 No. 9 9/6 6 3 0 0

This airtightness inspection device measures the exhaust pressure from the box while injecting a constant pressure gas into the box from the air supply passage, and compares the exhaust pressure with the injection pressure. When the pressure was almost the same, the airtightness of the box was maintained, and when the exhaust pressure was lower than the injection pressure, it was recognized that the airtightness of the box was leaking. However, the above-described airtightness inspection apparatus has an air supply passage and an exhaust passage.

The structure is complex, such as providing a probe made of a double tube or installing a gas injection device using an air dryer.

In addition, since the connecting structure for connecting the probe to the box is simply an insertion, the structure becomes complicated and the cost of inspection is difficult.

Conventionally, in the airtight inspection of the box body, it has been carried out by using stone test water or a pace jar, etc., to find and identify the leaked part. In this method, the box body is contaminated by the stalagmite water. However, when applied to the box of equipment, there is a risk of causing leakage due to the use of water, and it is necessary to work carefully and actually Is not desirable because it is dangerous.

In addition, the sound of leakage (where the gas leaks)

方法 There is also a method to find the leak location by relying on it, but it is extremely difficult to hear the leak noise in a noisy area, which is also impractical

Conventionally, a helium gas detection device (a helium gas detector) has been used to identify leaking parts such as refrigerant pipes such as motive power electric aircon.

In the method using this helium gas detection device, helium gas is injected into the α-tight space to confirm the pressure change in the air-tight space, and the leak point that causes the pressure decrease is specified by the helium gas detection device. However, in outdoor work such as electrical work, it was necessary to thoroughly shut down the airtightness 3 type test, and there was a problem that the use of expensive helium gas was economically constrained.

Traditionally, gas visualization and other leak test methods have been utilized in hydrodynamics and leak test.

The following types of these are known:

1) Helium gas: The detection device is more expensive than the inspection contents of the electrical box Is

2) Ammonia gas: Apply a color former on the outside to detect leaks. The monmonia is a powerful drug designation.

3) Ultraviolet lamp irradiation: Use a fluorescent agent to check the Joke spot by ultraviolet lamp irradiation. The use of fluorescent substances is clearly contaminated at the time of inspection, and the possibility of surface contamination is high, making it difficult to use.

4) Ultrasound: Measures the sound wave leaking by measuring the natural sound wave at the time of leak. The device is more expensive than the contents of the test of the electric box, and it is difficult to apply to the box etc.

5) Foaming method: A method of observing leakage by foaming with foaming liquid under pressure in a closed state. Because surface contamination during inspection is likely to be a problem, it is difficult to use it for equipment.

6) Phenomenon method: This method is used when the test agent cannot be added. The test agent is applied to the outside of the part where there is a possibility of leakage. If there is a leak, the dye contained in the test agent will develop color. . Because surface contamination during inspection is likely to be a problem, it is not recommended for use in electrical equipment.

7) Air leak: Although it is detected as a slight differential pressure change from the reference tank (master) by applying atmospheric pressure or exhausting it to a vacuum, it can recognize air leaks that judge pass / fail. It is difficult to identify leak points such as boxes

In addition, as a gas visualization method, the following can be considered:

1) Dry ice: Excluding the question of using carbon dioxide, surface contamination during inspection is unlikely to be an effective means.

2) Ammonia: Utilizes a fuming reaction with hydrochloric acid. It is difficult to use due to the safety problem of using powerful drugs.

3) Water, Glycol, Smoke machine: Smoke from Glycol Is effective for visualization, but it is highly likely to cause surface contamination of equipment due to oil components such as glycol as a result of fuming. Be

4) Oxidizing power Lucium, Gnesium chloride, Alum chloride, Calcium chloride •

, Iron oxide, etc.), and since the substance is used, it is highly likely that it will be metallic material, diffuse, and cause surface contamination of the equipment.

5) Exothermic agents composed of lead, key iron, and antimony trisulfide: Any of them is considered to be unsuitable because it is highly likely that metallic materials will diffuse and cause surface contamination of the equipment.

6) Yellow phosphorus (yellow phosphorus fumes): When released into the atmosphere, yellow phosphorus burns spontaneously to form nitric pentoxide. Nylon pentoxide absorbs water vapor in the atmosphere and produces white fumes. It is designated as Class 3 dangerous goods by the Fire Service Act, and unreacted substances are considered harmful and are not suitable for use.

7) Red phosphorus (red phosphorus fumes): When released into the atmosphere, red phosphorus spontaneously burns to form nitropentoxide. Nylon pentoxide absorbs water vapor in the atmosphere and produces white fumes. It is designated as Class 3 dangerous goods by the Fire Service Act, and unreacted substances are considered harmful and are not suitable for use.

8) Mixing of zinc oxide and tetrachloroanhydrofuric acid: Make sure that the flight trace and landing point of the flying object are known. In any case, it is highly likely that the surface of the equipment will be contaminated, so use is considered inappropriate.

9) Mixing of zinc oxide and vinyl chloride resin: Both are considered to be unsuitable for use because they are likely to cause equipment surface contamination.

1 0) Flow paraffin: Heated and used for fluid analysis of airplanes. Use is considered inappropriate because it is likely to cause surface contamination of the equipment.

1 1) Red dye, chloric acid, sugar, inert binder: bandits Money pack for prevention. In any case, it is highly possible to cause surface contamination of the equipment, so use is considered inappropriate.

1 2) Titanium chloride: Since it is highly likely to cause surface contamination of the equipment, its use is considered inappropriate.

1 3) Ethylene glycol: It is highly likely to cause surface contamination of the equipment, so use is considered inappropriate.

In the above, surface contamination and toxicity are problems,

-Substances that are easily available, have low toxicity, and have a low possibility of surface fouling are considered to be dry ice.

A substance that emits white smoke or smoke-like gas that is unlikely to cause surface contamination due to reaction with water may be used instead of dry ice.

However, for dry ice (solid carbonic acid), sublimated carbon dioxide has a specific gravity of about 2.33, which is heavier than air, and is inside a tunnel or a building with poor ventilation. Not suitable for inspection

In this case, you can use safe helium gas, excluding the cost, but helium gas is lighter than air, but if it fills up, there is a risk of oxygen deficiency, so be careful when using it during inspection. Need to pay. Helium gas has a slow dissolution rate in the blood, so it is used in oxygen cylinders as a substitute air to replace nitrogen for the purpose of preventing diving diseases, while carbon monoxide has little strong acute toxicity, Use with caution

The present invention provides white smoke or smoke-like gas that reacts with water and is not likely to be contaminated in the interior of a box or the like during airtight inspection of a box or the like for mounting a water vapor movement control device. A substance that emits light (for example, dry ice) is smoked and filled with white smoke (frozen water vapor) or smoke-like gas, and the white smoke or smoke-like gas is visually recognized from the outside of the box or the like. And to make it possible to identify and identify airtight leaks.

Conventionally, dry ice smoke is often used in events, but it is not used for airtightness inspections of boxes for installing water vapor transfer control devices.

Therefore, the present invention provides an airtight inspection technique that has a simple structure, can ensure safety, and can reliably find and identify an airtight leak location such as a box with an inexpensive cost. Disclosure of the Invention

In order to solve the above-mentioned problem,

1)

One vent P communicates with the inside of a box or the like, which is an object to be inspected, the other vent is opened to the atmosphere, and a plurality of small chambers are formed between the one vent with a permeable and moisture permeable membrane. The two compartments are formed

□ Remove the steam transfer control device (S) to control the steam transfer between

This is an airtight inspection method that uses a box (K), etc.

And

Install a smoke container (2) containing a substance (d) that emits white smoke or smoke-like gas that may react with water and cause surface contamination, and place it inside a storage box (K). Supplying water into the smoke container (2) causes the substance (d) power to emit white smoke or smoke-like gas, and the white smoke or smoke-like gas is in the closed state ( If the inside of the box (K) etc. is pressurized with air pressure with the capacity filled into the inside of the box (K) etc. Leaving white smoke or smoke-like gas from the place, the white smoke or smoke-like gas leakage place the box

The box (K) can be seen visually from outside such as (K). It was set as the structure which discovers and identifies the airtight leak places, such as.

In addition, the airtightness inspection method of the present invention (nrf claim 2)

In the airtightness inspection method according to claim 1, the substance (d) that emits white smoke or smoke-like gas that reacts with mj water and is unlikely to cause surface contamination is dry ice (D).

In addition, the airtightness inspection method of the present invention (gff claim 3)

3. The airtight inspection method according to claim 1 or 2, wherein helium gas is supplied together with white smoke or smoke-like gas into a closed box (K) or the like, and white smoke is generated by the helium gas. Or, a configuration that fills the inside of the box (K) with smoke-like gas is adopted o

In addition, the airtightness inspection device of the present invention (claim 4)

One vent is communicated with the inside of a box or the like that is an object to be inspected, the other vent is opened to the atmosphere, and a plurality of small chambers are provided between the one vent with a film body having air permeability and moisture permeability. An air-tightness inspection device (A) that has a compartment (K) for mounting a water vapor movement control device (S) that controls the movement of water vapor between the two vent holes. ,

Smoke containers (2) for containing substances (d) that emit white smoke or smoke-like gases that are difficult to cause surface contamination due to reaction with water

Water tank (3) for storing the water supplied to the smoke container (2)

A mounting hole (91) formed in the box (K) etc. for mounting the water vapor movement control device (S)

Connect the J smoke generator (2) installed inside the box (K), etc., through the mounting hole (91) and the water tank (3) placed on the outside of the box (K), etc. The waterway (4)

Pump for pressurizing the inside of the box (K) etc. with air pressure (5) It was set as the structure which admired.

The airtightness inspection device of the present invention (Claim 5)

5. The airtight inspection device according to claim 4, wherein the substance d) which emits white smoke or smoke-like gas which reacts with the water and hardly causes surface contamination.

The configuration of F-line (D) was adopted.

Further, the airtightness inspection device of the present invention (Claim 6)

In the airtightness inspection device according to claim 4 or 5: a fu container

(2) Overflow container (2)

1) The configuration shown in X is adopted.

In addition, the airtightness inspection device of the present invention (Claim 7)

In the airtightness inspection device according to any one of claims 4 to 6, a configuration is adopted in which the water tank (3) is detachably and vertically movable attached to the outer surface of the box (K) or the like.

In addition, the airtightness inspection device of the present invention (claim 8)

The airtightness inspection device according to any one of claims 4 to 7, wherein a pressure gauge (6) is provided in an air supply path (52) by the pump (5).

In addition, the airtightness inspection device of the present invention (claim 9)

In the airtightness inspection device according to any one of claims 4 to 8, the helium gas supply device (7) is provided with an on-off valve (7) in the middle of the water passage (4).

The configuration is connected via 0). Brief Description of Drawings

FIG. 1 is an overall view showing an embodiment of an air tightness inspection apparatus of the present invention. FIG. 2 is a cross-sectional view showing an example of a water vapor movement control device. BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is an overall view showing an embodiment of an airtightness inspection apparatus according to the present invention, and FIG. 2 is a cross-sectional view showing an example of a water vapor movement control device.

The airtight inspection device A (shown in FIG. 1) of this embodiment is for examining the airtight state inside the box K to which the water vapor movement control device S (shown in FIG. 2) is attached. In order to install the water vapor transfer control device S, it is installed using the mounting holes 9 1 formed in the bottom wall 90 of the box K.

As the box K, for example, a power supply cubicle, control box, switch box installed on the top of a steel tower or building, a box with a distribution box and a space with a certain closed circuit formed inside. Assuming body

As shown in Fig. 2, the water vapor transfer control device S has three membrane bodies M

The two chambers R and R are defined between the vents P and Q by M and M, and the movement of water vapor between the vents P and Q is controlled. In the bodies M, M, M, the conductive porous body is arranged in the vicinity.

That is, one vent P is opened to the outside air, and the other vent Q is a box.

K is used in contact with the inside of each of the film bodies M,

Utilizing the gradient of M and M air permeability and moisture permeability, the movement of water vapor is controlled to adjust the humidity inside the box K according to the temperature fluctuation speed of the outside air and the box K

The water movement control device S of the embodiment includes a small chamber unit 10 and an outer cylinder casing 1 1 in which the small chamber unit 10 is fitted.

The m chamber unit has two chambers R and R formed by three membrane bodies M, M and M inside.

,

And the HiJ small chamber unit 10 is located inside the outer casing 11 1

Fitting part 1 formed at the upper end of this outer cylinder casing 1 1

2 is fitted into the mounting hole 9 1 formed in the bottom wall 90 of the box K from the outside, and the nut 卜 1 3 is screwed into the fitting portion 12 from the inside of the box K. Next, the configuration of the airtightness inspection apparatus A will be described.

The airtightness inspection apparatus A of the present embodiment mainly includes a smoke container 2, a water tank 3, a water passage 4, and a pump 5.

In this embodiment, explanation will be given for the case where lyase D is used as the reactant d.

The smoke container 2 has a dry ice D as a reactant d inside.

(Crush Dry Ice) is stored in the interior of the overflow container 2 1 with the stay 2 2 and a large amount of water is supplied to the interior. In such a case, the water overflows from the overflow hole D 3 formed on the side wall and is accommodated in the overflow container 21.

The smoke container 2 is detachably installed on the bottom wall 90 inside the box K.

In addition, the bottom of the smoke container 2 is formed in a double bottom structure that is separated from the water so that it does not come into contact with water, and a portable warmer (a portable warmer that uses iron oxide) is placed inside the bottom. Make sure that the water in container 2 is warmed.

The water tank 3 is for containing the water to be supplied to the smoke container 2 and is formed to be transparent so that the water level can be confirmed from the outside. The water tank 3 is detachable on the outer surface of the box K and moves up and down. Can be attached as possible.

In this embodiment, the magnet 3 1 is attached to the side surface of the water tank 3 so that it can be attached to and detached from the outer surface of the box K and can be moved up and down. If the box K is a non-magnetic material, the side of the box Κ If the plate is pasted, the magnet 3 1 can be used, and in addition to the magnet, a suction cup can be used.

Also, as a means for moving the water tank 3 up and down, slide the fixed part and slide it with a screw to make it easy to slide with one hand and set screw. As a result, it is possible to prevent the outer coating of the box from being damaged by moving the magnet slide, and the operation becomes simple.

In addition, a small heat exchanger or a scissors-type HI--evening is arranged below the water tank 3 to heat the water in the water tank 3 or the water in the tube forming the water passage 4 You may do it.

In this case, the heating wire is heated by battery operation, and hot water that can easily generate the Diess smoke is supplied even in cold regions.

The capacity (Q 1) of the water tank 3 is the volume of the smoke container 2 (Q

2) and the capacity of the overflow container 2 1 (Q3)

Smaller than (Q 2 + Q 3) (Q 1) <(Q 2 + Q 3), and the total amount of water in the water tank 3 is transferred to the fume container 2 and the overflow port-container 2 It can be stored in 1 and prevents water from overflowing into the box K from the overflow container 2 1.

The water passage 4 is for connecting the smoke container 2 placed inside the box body K through the mounting hole 91 and the water tank 3 attached to the outer surface of the box body K.

In this embodiment, a tube holder 40 is inserted into the mounting hole 9 1.

The O-ring 4 1 and the nut 4 2 are attached in an airtight manner, and the tube or the like forming the water passage 4 is piped using this tube holder 40.

A through hole 4 extending from the upper end surface to the lower end surface of the tube holder 40.

3 is formed, and the connecting member 4 for the tube is formed at the lower end of the through-hole 4 3.

4 is installed airtight. Then, the lower end of the connection member 4 4 and the bottom of the water tank 3 are connected by an external flexible tube 4 a-and the lower end of the insertion tube 4 b inserted into the through hole 4 3 is connected to the connection member 4. 4

Connect to the top, connect an L-shaped metal tube 4 c to the upper end of the through-tube 4 b, and connect the tip of the lateral portion of the L-shaped metal tube 4 c and the smoke container 2 to the inner tube. Rexible tube 4d is connected to hi.

The L-shaped metal tube 4c is used to prevent the tube from being bent by the horizontal portion 45, so that the siphon phenomenon does not occur.

Further, a cock valve 46 is attached to the external flexible tube 4a.

In addition, the external flexible tube 4a and the L-shaped metal tube 4

C, The inner flexible tube 4d can be covered with a heat insulating material to prevent a drop in the water temperature when passing through the tube.

The pump 5 is used to pressurize the inside of the box K with air pressure, and an air bag is used that expands and contracts by gripping the hand and feeds air into the box.

靑 U-type pump 5 is connected to the tube holder 4 by the air pipe 51.

0 is connected to the through hole 4 3, and the gap between the inner surface of this through hole 4 3 and the insertion tube 4 b is connected to the inside of the box K as the air supply path 5 2 o

In addition, a pressure gauge 6 is attached to a tube holder 40 so as to communicate with an air supply path 52 of the pump 5, and the pressure is applied by the pump 5 by the pressure gauge 6. In this embodiment, helium gas is provided in the middle of the water channel 4.

P device 7 is connected via on-off valve 70. The helium gas supply device 7 includes a helium gas cylinder 7 1 filled with helium gas, and the helium gas cylinder 7 1 and a water channel.

4 has a flexible gas hose 7 2, and an open / close valve 70 is provided between the gas hose 7 2 and the water passage 4.

Therefore, if the on-off valve 70 is opened and closed as necessary, the helium gas from the U umuga spombe 71 is supplied into the smoke container 2 through the gas hose 72 and the water passage 4.

As a result, dry ice reacts with water in the smoke container 2 to generate white smoke or smoke-like gas, and at the same time, helium gas from the U-hum gas supply device 7 is transferred to the white smoke or smoke-like gas. Mix

Since this helium gas is lighter than carbon dioxide and air, the mixed gas of U-hum gas and carbon dioxide rises and diffuses inside the box K and fills the inside of the box K evenly. As a result, it is possible to reliably find the leak location.

In the airtight inspection, after supplying predetermined water from the water tank 3 into the smoke container 2 and confirming that smoke is started by reaction with dry ice, the external flexible tube 4 a In the middle of the operation, close the gas leak prevention valve 7 3 so that the helium gas

3 is prevented from coming out, and then the on-off valve 70 is opened to supply U-um gas.

Next, an inspection method using the airtight inspection apparatus A will be described.

In the airtight inspection of the box K by the tightness inspection device A, the water vapor transfer control device S is removed from the mounting hole 9 1, and the airtightness inspection device A is attached using this mounting hole 9 1. .

First, the smoke container 2 is installed inside the box K, and the water tank 3 is attached to the outer surface of the box K by the magnet 3 1.

Insert the tube holder 40 into the mounting hole 9 1 ○ Ring 4 1 Attach the L-shaped metal tube 4 c to the upper end of the insertion tube 4 b previously attached to the connection member 4 4 of the tube holder 40 and connect this L-shaped metal. Tube 4

Connect the tip of the sideways portion 45 of C to the bottom of the smoke container 2 with the inner flexible tube 4d, and connect the connecting member 4 4 and the bottom of the water tank 3 with the outer flexible tube 4a. The outer flexible tube 4 a, the connecting member 4 4, the insertion tube 4 b, the L-shaped metal tube 4 c and the inner flexible tube 4 d form a continuous water passage 4. Let

Next, the upper limit level of the draft line of the smoke container 2 installed inside the box K is transferred to the outer surface of the box K with rubber tape.

When water or hot water is poured into the water tank 3 attached to the outer surface of the box K, the water is supplied to the smoke container 2 through the water passage 4.

In this case, the water level rises slowly, but it is measured in advance even if the water level is higher than the upper limit level of the draft line of smoke container 2 transferred to the outer surface of box K marked HIJ. The amount of water

By putting it in 3, it does not exceed the maximum water line of the smoke container 2, and there is no worry of water overflowing into the box K

In order to identify the airtight leak location of box K, after preparing the water to water tank 3 as described in HIJ, a certain amount of dry device C that has been crashed into smoke container 2 Put in. At this stage, the three-way valve 4 6 of the water tank 3 is closed.

When handling dry ice D, if you think of a tea strainer-like hand-held container, do not touch the dry ice D directly during work, and keep the cooler box and smoke container 2 in storage. Can be transported between. 6

Next, the box body 閉鎖 is closed, the cock valve 46 is opened, and the water tank 3 is shifted upward to a position not exceeding the upper limit level, so that the water tank 3 passes through the water passage 4. Water is supplied to the smoke container 2, and water and dry ice D come into contact with each other in the smoke container 2 to generate smoke, producing a lot of white smoke (frozen water vapor) and filling the inside of the box body.

In this case, if the size of the box body is large and white smoke is not sufficiently filled in the box body, helium gas is emitted from the smoke container using the helium gas dressing device 7 as described above. Within 2

<This makes it possible to promote the filling of white smoke inside the box body.

Since helium gas is expensive, it is preferable to use it as needed. Supply and stop of the helium gas is performed by opening and closing the on-off valve 70.

Next, after closing the cock valve 4 6 of the water tank 3, the pump 5 is operated manually to check the airtightness of the box body.

When the inside of the box Κ is pressurized with air pressure by the air supply from 5, if there is an airtight leak location in the box 白, white smoke is pushed out from the airtight leak location by the pressurization and leaks Therefore, by visually observing the leakage area of the white smoke from the outside of the box body, it is possible to discover and identify the dense leakage area of the box body.

If the white smoke is not visible, it is judged that there is no confidential leak.

In addition, after pressurizing the inside of the box Κ with the pump 5, it is possible to check whether there is any air leakage in the box 見て by looking at the pressure gauge 6.

At this time, if the measured value of the pressure gauge 6 shows a constant value, there is no air leakage and airtightness is maintained, and if the measured value of the pressure gauge 6 gradually decreases, the box Air leaks somewhere in the cage and is airtight 7

It can be judged that the sex is impaired.

Ensuring complete airtightness of boxes, etc. (electrical boxes, etc.) is difficult with the usual construction method

The water vapor transfer control device S is designed to cope with the state {rough closure (airtightness)}. Therefore, if the rate of airtight leakage satisfies a certain standard, the closing test 卜 is accepted. For example, about 1

This is a good way to pass the test if it is pressurized in 0 cm water and does not reach 0 in 10 seconds. Such slight leakage may be difficult to see with this inspection method, but it can also be re-inspected by using the gas sing technique.

After identifying the location where the white smoke leaked as described above, it is necessary to stop the fuming immediately in order to carry out the work smoothly and reduce the work time of each box.

For this purpose, the inspector shifts the water tank 3 attached to the outer surface of the box K downward, and then opens the cock valve 4 6 of the water tank 3 and installs smoke inside the box K. By returning the water in the container 2 to the water tank 3, the water in the fume container 2 does not come into contact with the door and the lay ice D, and the fume can be stopped quickly.

As a result, it is possible to minimize the amount of use of Dry D, and shorten the work time.

In addition, since the water level in the smoke container 2 can be ascertained from the outside of the box K, the risk of water leakage into the box K can be avoided and it is safe.

After finding and identifying the airtight leak location as described above, repair and improve the sealing performance of the airtight leak location, and then conduct the inspection again to confirm the presence of the air leak location.

After the inspection is completed, the inspector quickly collects and stores the dry ice D in the smoke container 2 in a cooler box or the like for the next inspection work. 8

To minimize wear on the Rise D o

In addition, by lowering the water tank 3 outside the box K, the water in the smoke container 2 and the tubes in which the door D and the license D were placed can be easily drained.

In the embodiment, the box K is oriented vertically to emit smoke on the bottom wall 90.

2 to Hi

Although an example of placing the X is shown, when the box is manufactured (when assembling the box, etc.), the box may be placed on its side. In this case, the smoke container 2 is installed on the side wall of the box located on the bottom.

In the present invention, instead of dry ice D, the reactive substance may be a substance that emits white smoke or smoke-like gas that reacts with water and is less likely to cause surface contamination. There is a possibility of developing drugs that generate white smoke from a mixture of glycol and pyrogens such as magnesium oxide and magnesium oxide.

It is also possible to use such a substance as the reactant of the present invention.

In the present invention, a mesh-like cover is placed over the smoke container 2 for the purpose of preventing the reactant d in the smoke container 2 from splashing due to bumping or the like or due to a rapid reaction. O

In addition, the material of the smoke container 2 is heat resistant so that the smoke container 2 does not crack or break due to a sudden temperature change due to the temperature change during the reaction of the reactant d in the smoke container 2. Propylene, heat-resistant glass, etc. may be used.

Also, the external flexible tube

The Industrial applicability 9

The airtightness inspection method of the present invention (Claims 1 and 2 and the airtightness inspection device (Claims 4 and 5)) is provided by bringing a reactant, for example, a ring into contact with water inside a box or the like. The reaction material is smoked and filled with white smoke or smoke-like gas, and the white smoke or smoke-like gas is visually observed from the outside of the box, etc. With a simple structure, safety can be ensured, and a leaky place such as a box can be reliably found and identified with low cost.

In particular, since the reactant contained in the smoke container smokes inside the box, etc., white smoke or smoke-like gas from the smoke can be filled into the box as it is, and white smoke or smoke There is no disappearance of white smoke or smoke-like gas, which is a problem when sending gas inside a box or the like with a tube.

In addition, since a pressurized pressure is applied to the inside of the box filled with white smoke or smoke-like gas, the white smoke or smoke-like gas can be surely pushed out from the airtight leakage place and leaked.

In addition, white smoke or smoke-like gas is agitated inside the box body by supplying air from the pump, and the inside of the box body can be filled with white smoke or smoke-like gas evenly.

In addition, when an overflow container is provided (Claim 6), when water overflows from the smoke container, the overflowed water can be received and water can be prevented from spilling into the box.

If the water tank is attached to the outer surface of a box or the like so as to be removable and movable up and down (Claim 7), smoke can be generated by operating the box from the outside by moving the water tank up and down. It is possible to supply and drain water to the container in an appropriate manner, and work efficiency can be improved.

If a pressure gauge is installed in the air supply path of the pump (claim 8), it is possible to confirm the leakage of confidentiality with this pressure gauge, and white smoke or smoke-like gas It is possible to perform a double inspection system consisting of a Λ tightness leak test by the pressure gauge and an airtight leak test by a pressure gauge.

The tightness inspection method of the present invention (Claim 3) and the airtightness inspection apparatus (Claim)

In 9), helium gas can be supplied to the inside of a box or the like through a shut-off valve from a helium gas supply device in contact with the water passage (4).

White smoke or smoke: When dry substance is a gas-emitting substance

(Claim 25), since carbon dioxide gas (frozen water vapor) generated from this dry ice is heavier than air, it stays at the bottom of the box and does not diffuse to fill the inside of the box. There is a strong tendency for A where the volume of the box is large.

From an α-helium gas supply device such as through a waterway

When U-um gas is supplied to the smoke container, white gas or smoke-like gas generated by reaction with water in the smoke container is mixed with helium gas.

Because U-hum gas is lighter than carbon dioxide and air, the mixed gas of helium gas and carbon dioxide rises and diffuses inside the box and fills the box evenly.

As a result, the leak location can be found reliably.

Claims

The scope of the claims

1. One ventilation P communicates with the inside of a box or the like, which is a test object, the other ventilation opening is opened to the atmosphere, and a plurality of small chambers pass between the two ventilation openings, thereby improving the properties and moisture permeability. Airtight inspection method for a box (K) etc. for mounting a water vapor movement control device (S), which is formed by a membrane body and controls the movement of water vapor between rain vents So,

A smoke container (2) containing a substance (d) that emits white smoke or smoke-like gas that is unlikely to cause surface contamination due to reaction with water is installed inside the HU box (K), etc. Supplying water into the smoke generation container (2) to emit white smoke or smoke-like gas from the substance (d), and the white smoke or smoke-like gas is closed box (K), etc. If the inside of the box (K) etc. is pressurized with air pressure with the capacity filled inside, if there is a leaky place in the box (K) etc., □ Smoke or smoke-like gas is leaked, and the white smoke or smoke-like gas leaks the box

A method of X-stenosis, which is characterized by discovering and identifying the location of airtight leaks such as box (K) by visual inspection from the outside such as (K)

J¾

2. The airtightness inspection method according to claim 1, wherein the substance (d) that emits white smoke or smoke-like gas that reacts with the water and is less likely to cause surface contamination is dryness (D). Inspection method

3. In the thorough inspection method described in Claim 1 or 2, white smoke or white smoke is supplied along with white smoke or smoke-like gas to the inside of a closed box (κ) etc. Alternatively, a method of close inspection that fills the inside of the box (K) with smoke-like gas

4.-Ventilation □ is communicated with the inside of the body to be inspected, etc. One of the vents is opened to the atmosphere, and a plurality of small chambers are formed between the one vent with a membrane body having air permeability and moisture permeability to control the movement of water vapor between the two vents. An airtight inspection device (A) for inspection of a box (K) or the like for mounting a water vapor movement control device (S),

A smoke container (2) for containing a substance (d) that emits white smoke or smoke-like gas that is unlikely to cause surface contamination due to reaction with water;

A water tank (3) for containing water to be supplied to the smoke container (2),

A mounting hole (9 1) formed in a box (K) or the like for mounting the water vapor movement control device (S);

The HU smoke container (2) placed inside the box (K) etc. through the mounting hole (91) and the water tank (3) installed outside the box (K) etc. A waterway (4) that connects the

A hermetic inspection comprising a pump (5) for pressurizing the inside of the box (K) with air pressure m. O

5. In the airtightness inspection device according to claim 4, the substance (d) which emits white smoke or smoke-like gas which is resistant to surface contamination against the water is formed with dry air ( D) Airtight inspection device ο

6. The airtight inspection device according to claim 4 or 5, wherein the smoke container

(2) Overflow mouth and water container (2)

1) Airtightness inspection device provided in o

7. In the airtightness inspection device according to any one of claims 4 to 6, the watertight tank (3) is detachably attached to the outer surface of the box (K), etc. and is movable up and down. Inspection device 0

8. In the airtight inspection device according to any one of claims 4 to 7,

RX pressure gauge (6) is connected to air supply path (52) by BG amplifier (5). Airtight inspection device.

9. The airtightness inspection device according to any one of claims 4 to 8, wherein the helium gas supply device (7) is connected to the passageway (4) via an on-off valve (70) in the middle of the waterway (4). Inspection device.