KR20100085631A - A leak inspection device - Google Patents

Abstract

PURPOSE: An air tightness testing device is provided to accurately measure the air tightness between a bonded material and a bonding layer under a given pressure. CONSTITUTION: An air tightness testing device comprises a housing(110), a test piece(20), a pressure chamber(120), a sealing material, a pressing unit and a pressure adjustment unit. The housing comprises an opening, which is formed on one side of the housing. The test piece is installed on the inner side of the opening. The pressure chamber is located in the housing and is located so that the test piece forms one side. The sealing material is detachably installed between the test piece and the pressure chamber. The pressing unit comprises an air pump(140) for pressurizing an airbag(190) and a pressure pump(150) for applying pressure to the pressure chamber. The pressure chamber is pressurized toward the test piece on which the sealing material is located. The pressure adjustment unit is connected to the pressure chamber in order to keep the inner pressure of the pressure chamber constant.

Description

A leak inspection device

The present invention relates to an airtightness tester, and more particularly, to an airtightness tester capable of inspecting the airtightness of an adhesive layer for adhering an adherend.

The cargo hold of the liquefied natural gas carrier has a double insulation panel structure of special structure for storing liquefied natural gas at -162 ° C.

The double insulation panel is composed of a lower insulation panel installed on the inner wall of the liquefied natural gas carrier hull, and an upper insulation panel installed on the lower insulation panel.

At this time, an insulation panel called a top bridge panel is attached between the upper insulation panels. In more detail, the top bridge panel is installed above the lower insulation panel and between the upper insulation panels.

At this time, when the top bridge panel is installed on the lower insulation panel, a secondary barrier made of a film called rigid triplex and supple triplex is installed between the top bridge panel and the lower insulation panel. do.

Such rigid triplex and supple triplex are bonded to each other by an adhesive called epoxy glue. At this time, in the secondary barrier consisting of rigid triplex and supple triplex bonded to each other by epoxy glue, the airtightness of the adhesive layer formed by epoxy glue as an adhesive is very important for improving the insulation performance of the insulation panel.

Thus, there is a need for an apparatus for inspecting the airtightness of an adhesive layer between a rigid triplex and a triple triplex.

FIG. 1 shows the airtightness of the adhesive layer 4 formed between the first adherend 2 and the second adherend 5 and the second adherend 5 and the third adherend 6 as the secondary barrier. The airtightness testing device 10 for inspecting the. In this case, the first adherend 2 may be, for example, a rigid triplex used for the secondary barrier, and the second adherend 5 and the third adherend 6 may be a triple triplex. The adhesive layer 4 may also be formed by epoxy glue.

Referring to FIG. 1, the leak testing apparatus 10 includes a housing 30 having a vacuum volume space 40, a vacuum pump 70 for maintaining a vacuum state of the housing, and a vacuum volume space 40. A pressure sensor 80 for measuring pressure. The vacuum pump 70 is connected to the vacuum volume space 40 by the vacuum pump line 60, the pressure sensor 80 is connected to the vacuum volume space 40 by the pressure sensor line 50.

The upper side of the housing 30 is formed to be open, the test piece 20 for inspecting the airtightness of the adhesive layer is located on the open upper side. At this time, between the test piece 20 and the housing 30 to maintain the airtightness using the adhesive (90).

At this time, the test piece 20, as can be seen in Figure 2, between the first adherend (2) and the second adherend (5) and the second adherend (5) and the third adherend (6) Each test object coated with the adhesive layer 4 is fixed to the support plate 22, for example, a stainless steel plate in a cross shape. In more detail, the configuration of a test piece for inspecting the airtightness by installing in the airtightness testing apparatus 10 will be described with reference to the drawings.

3 is an exploded perspective view of the test piece, and FIG. 4 is a cross-sectional view of A-A 'in FIG. 3. In this case, in FIG. 4, the thicknesses of the first adherend, the second adherend, the third adherend, and the adhesive layer are exaggerated than the actual thicknesses for better understanding.

As can be seen in FIG. 3, a cross-shaped opening 24 is formed in the support plate 22.

In this way, the first adherend 2 having the same cross-shaped opening 3 as the cross-shaped opening is fixed to the support plate 22 having the opening 24 formed thereon. At this time, the first adherend 2 is fixed to the support plate 22 by the adhesive layer 4, and the first adherend 2 covers the opening 24 of the support plate 22.

Thereafter, the adhesive layer 4 to be tested is applied around the opening 3 of the first adherend 2, and the second adherend 5 in the form of a straight line forms the opening 3 of the first adherend 2. ). The third adherend 6 in the form of a straight line is bonded onto the first and second adherends 2 and 5 on the support plate 22. At this time, the third adherend 6 is arranged in the vertical direction with respect to the second adherend 5 so that the opening of the first adherend 2 is open to the second adherend 5 and the third adherend 6. ) To be completely covered.

As shown in FIG. 2, the test piece is disposed so that the second and third adherends intersect each other on the first adherend, and then installed on a support plate to be inspected by an airtightness test device, or a straight opening. It is also possible to provide only one adherend on the first adherend to have and test the airtightness.

If the test piece 20 having the above-described configuration is installed in the airtightness testing device 10 and the vacuum state in the vacuum volume space 40 is maintained using the vacuum pump 70, the test piece 20 When the airtightness by the adhesive layer 4 to be tested is not maintained, that is, when the airtightness of the adhesive layer 4 is insufficient, as can be seen in FIG. 4, the adhesive layer 4 formed on the test piece 20 and the first Gas is introduced into the vacuum volume space from the outside through the gap between the adherend 2 and the second adherend 5.

At this time, the gas may also be introduced from the outside through the adhesive layer 4 between the first adherend 2 and the support plate 22, but since this is not an object to be tested, the first adherend 2 and After checking the amount of gas introduced by the adhesive layer between the support plates 22 before the inspection, the value is subtracted from the amount of gas generated as a result of the inspection on the adhesive layer to be tested. By doing this, it is possible to measure the amount of gas that leaks due to the adhesive layer to be actually tested.

On the other hand, when gas is introduced from the outside, the pressure of the vacuum volume space changes, and by measuring the changed pressure, it is determined whether the airtightness of the adhesive layer 4 is maintained.

However, the airtightness tester 10 using the vacuum pump 70 as described above is not composed of only the gas flowing in from the outside purely the amount of gas flowing in the vacuum.

In more detail, the amount of gas introduced during vacuum contains the gas or the adhesive layer itself generated by evaporation of moisture on the surface of the material, in addition to the gas introduced through the space between the adhesive layer and the adherend due to the inferior airtightness of the adhesive layer. The amount of gas flowing in was included.

Therefore, the leak-tightness tester using the vacuum as described above has a problem that can not accurately measure the amount of gas flowing from the outside purely between the adhesive layer and the adherend applied to the test piece to be tested.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an airtightness tester that can accurately measure the degree of airtightness between the adhesive agent and the adhesive layer provided on the test piece.

According to the present invention in order to achieve the above object, the opening is formed on one side of the housing, the test piece is installed on the inner side of the open side of the one side, the pressure is located inside the housing, the press is positioned to form one side A chamber, a seal detachably installed between the test piece and the pressurizing chamber, a pressurizing means for pressurizing the pressurizing chamber toward the test piece on which the seal is located, and a pressure connected to the pressurizing chamber to maintain a constant pressure inside the pressurizing chamber. An airtightness testing device is provided, including an adjusting means.

At this time, the test piece includes a support plate having an opening, a first adherend disposed to cover the opening of the support plate, an adhesive layer applied on the first adherend, and a second adherend adhered on the adhesive layer. And, when the test piece is installed in the opening of the housing, it is preferable that an opening is formed in the first adherend in order to expose one side of the second adherend to the outside.

On the other hand, the pressing means may be an air bag into which air can be injected and a pressure board for uniformly dispersing the pressure applied to the pressure chamber by the air bag.

On the other hand, the pressure adjusting means may be a pressure pump for introducing the same gas as the gas in the pressure chamber into the pressure chamber.

At this time, it may further include a measurement sensor for measuring the amount of gas introduced by the pressure pump.

The apparatus may further include a pressure sensor for measuring the pressure in the pressurization chamber.

The apparatus may further include a detector for detecting a gas exiting the test piece according to the pressure applied by the pressure chamber.

In this case, the pressurized fluid may be air or an inert gas.

According to the present invention, since the airtightness between the adherend formed on the test piece and the adhesive layer is inspected using the pressurized state rather than the vacuum state, the error due to the vacuum characteristics can be reduced, so that more accurate airtightness measurement is possible.

Hereinafter, an airtightness testing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

5 is a schematic diagram of an airtightness testing apparatus according to an embodiment of the present invention. 6 is an exploded perspective view of the pressure chamber, the pressure-sensitive adhesive and the test piece installed inside the airtightness testing apparatus.

5 and 6, the airtightness testing apparatus 100 according to an embodiment of the present invention includes a housing 110, a pressure chamber 120 installed inside the housing, and a pressure chamber 120. An air bag 190 for applying pressure and a pressure pump 150 connected to the pressurization chamber.

The housing 110 constitutes a main body of the airtightness testing apparatus, and an opening 118 is formed on one side.

The test piece 20 is mounted to the opening 118. The test piece 20 is installed on the inner side of the opening. The housing 110 may be formed so that the surface on which the opening is installed may be opened and closed in the form of a door so that the test piece 20 may be installed on the inner side of the opening. In this way, the surface on which the opening is installed can be opened and closed in the form of a door, so that the specimen can be easily attached and detached.

The pressurizing chamber 120 is installed adjacent to the inner side of the opening 118. In the pressurizing chamber 120, a gas for inspecting the airtightness of the test piece 20 exists. At this time, the gas is preferably air or an inert gas such as helium.

As can be seen in Figure 6, the pressurizing chamber 120 may be formed of a box in the form of a rectangular parallelepiped, one side of which is preferably formed of a rigid material so that the volume does not change.

The test piece 20 is positioned on the opened one surface of the pressure chamber 120. When the test piece 20 is located in the pressurized chamber 120, it is preferable that a complete seal is made between the test piece 20 and the pressurized chamber 120.

To this end, a sealant is used to maintain a seal between the pressurization chamber 120 and the test piece 20. As the sealing material, it is possible to use a butadiene rubber-based adhesive 160. Such butadiene rubber-based pressure-sensitive adhesive is formed so that the test piece is adhered to the pressure chamber, and can be detached from the pressure chamber after the test.

On the other hand, the airtightness testing apparatus according to an embodiment of the present invention is formed to test the airtightness between the adhesive layer and the adherend using the test piece 20 described above. Description of the installation and configuration of the test piece 20 is the same as described above, so a detailed description thereof will be omitted.

If a high pressure is maintained in the pressurizing chamber 120 while sealing is performed between the pressurizing chamber 120 and the test piece 20, the adhesive layer 4 when the airtightness of the adhesive layer 4 to be tested of the test piece 20 is not high. The leakage of gas inside the pressurizing chamber 120 occurs through the gap between the first adherend 2 and the second adherend 6. In one embodiment of the present invention, the airtightness of the adhesive layer is measured by measuring the amount of gas flowing out through the test piece 20 while maintaining the pressure of the pressure chamber 120 at a high pressure.

The pressure sensor 114 for measuring the pressure inside the pressurizing chamber 120 may be installed inside the pressurizing chamber 120. When the pressure sensor 114 is installed inside the pressurizing chamber 120, the pressure Only the pressure change detection by the sensor 114 can measure the degree of airtightness of the adhesive layer.

On the other hand, the pressure chamber 120 is connected to a pressure pump 150 for injecting gas in order to maintain a uniform pressure inside the pressure chamber 120.

At this time, the gas flowing into the pressurization chamber 120 from the pressure pump 150 is preferably the same gas as the gas inside the pressurization chamber.

In the conduit through which the gas flows from the pressure pump 150 into the pressurization chamber 120, a butterfly valve 154 is installed to adjust the amount of the gas introduced therein.

The conduit may also be equipped with a flow meter 152 for measuring the amount of gas passing through.

Accordingly, the amount of gas discharged through the test piece 20 can be measured by measuring the amount of gas introduced into the pressurizing chamber 120. By measuring the amount of gas, the airtightness between the adhesive layer and the adherend is accurately measured. Can be checked

On the other hand, the inside of the housing 110 is provided with a pressing means for applying a pressure to the pressure chamber 120. The pressurizing means is a component for pressurizing the adhesive 160 to complete the sealing between the pressurizing chamber 120 and the test piece 20. In this embodiment, when the pressurizing means pressurizes the pressurizing chamber 120, the pressurizing chamber 120 presses the pressure-sensitive adhesive 160 to the test piece 20 side, and thus, the pressure between the pressurizing chamber 120 and the test piece 20 is completed. Sealing can be achieved.

In one embodiment of the invention, the pressurizing means is an inflatable airbag 190 and a pressure distribution plate 130 for uniformly transferring the pressure of the inflated airbag 190 to the pressurizing chamber 120.

The airbag 190 is installed inside the housing 110, and an air pump 140 for injecting air into the airbag 190 may be installed inside or outside the housing.

On the other hand, as can be seen in Figure 5, the pressure distribution plate 130 is installed on both sides of the airbag 190 to uniformly transfer the pressure due to the expansion of the airbag 190 to both sides of the airbag 190.

The pressurization method using the airbag 190 and the pressure distribution plate 130 may pressurize a large area in a relatively simple manner. Therefore, by using the airtightness testing apparatus according to the present embodiment, it is possible to increase the size of the test piece to be tested for airtightness.

In this embodiment, the airbag 190 is provided as a means for pressurizing the pressurizing chamber 120. In addition, if the pressurizing means is a known type that pressurizes the pressurizing chamber with a uniform pressure, for example, Alternatively, various types of cylinders using pneumatics may be used.

On the other hand, a detector 170 for detecting a gas that passes through the test piece from the pressurizing chamber 120 is installed on the opposite side of the housing 110 in which the test piece is installed.

At this time, if the gas present in the pressurization chamber 120 is, for example, helium gas, if a detector capable of detecting helium gas is installed, the detection unit 180 connected to the detector detects helium gas, helium gas The detection signal is sent to the detector. Accordingly, when the helium gas detection signal is generated in the detector, it is possible to confirm that the helium gas has leaked out through the gap between the adhesive layer and the adherend.

Hereinafter, a method of operating the airtightness testing apparatus according to an embodiment of the present invention having the above configuration will be described.

First, an airtightness testing apparatus according to an embodiment of the present invention is set. The process of setting the leak detection apparatus is as follows.

First, as shown in FIGS. 5 and 6, one side of the adhesive 160 is positioned on the side of the pressure chamber 120 positioned inside the housing 110 of the airtightness testing apparatus, and the other side of the adhesive 160 is located. Place the specimen on the side. At this time, the installation of the pressure-sensitive adhesive 160 and the test piece 20, for example, as described above, by opening a door (not shown) installed on the open surface of one side of the housing 110, the pressure-sensitive adhesive and the test piece on the pressure chamber side By positioning the door and closing the door.

On the other hand, the test piece 20 installed in the pressure chamber 120, as described above with reference to Figs. 2 to 4, the first adherend 2, the second adherend 5 and the second adherend 5 ) And a test piece in which a test object coated with the adhesive layer 4 between each of the third adherends 6 is fixed to the support plate 22, for example, a stainless steel plate, in a cross shape.

At this time, the airtightness measured by the test piece 20 is airtight by the adhesive layer between the first adherend 2 and the second adherend 5 and the second adherend 5 and the third adherend 6. Therefore, the amount of gas introduced through the adhesive layer 4 between the first adherend 2 and the support plate 22 is checked before using the inspection apparatus, and the value is to be tested by the inspection apparatus. It is desirable to subtract from the amount of gas generated as a result of the inspection on the adhesive layer.

By doing in this way, the quantity of gas which generate | occur | produces as a result of the test | inspection with respect to the adhesive layer to test in this inspection apparatus can be measured correctly.

As described above, the configuration of the test piece used in the airtightness testing apparatus according to the exemplary embodiment of the present invention may be the same as the test piece used in the airtightness testing apparatus according to the related art described above.

On the other hand, after the test piece 20 is installed in the housing, the air pump 140 for pressurizing the airbag 190 and the pressure pump 150 for applying pressure to the pressurizing chamber 120 are initialized.

Thereafter, in the state in which the test piece 20 is installed inside the housing 110, air is injected into the airbag 190 using the air pump 140.

As a result, the air bag 190 into which the air is injected pressurizes the pressure distribution plate 130, and as a result, the pressurizing chamber 120 is pressed to the right side as shown in FIG. 5 to be in close contact with the test piece 20.

Air is injected into the airbag 190 to inject air into the pressure chamber 120 while the pressure chamber 120 is in close contact with the test piece 20 to increase the pressure inside the pressure chamber 120.

When the pressure inside the pressurizing chamber 120 is increased in this way, the adhesive layer 4 which bonds the first adherend 2, the second adherend 5, and the third adherend 6 installed on the test piece 120 to each other. Gas inside the pressurizing chamber 120 is discharged to the right direction when viewed from outside the housing 110, that is, in FIG. 5.

As such, the gas discharged to the outside of the housing 110 may be detected by the detector 170 installed outside the housing 110.

In the airtightness testing apparatus according to an embodiment of the present invention, the airtightness measurement may be made by measuring the amount of gas introduced into the pressurization chamber through the pressure pump. It is also possible to determine whether the adhesive layer is airtight by detecting the gas discharged out of the housing by a detector provided outside the housing.

In the airtightness testing apparatus according to an embodiment of the present invention, the pressure chamber is maintained by maintaining a high pressure in the pressure chamber inside the housing of the airtightness testing apparatus rather than determining whether gas is introduced from the outside to the inside while maintaining the vacuum state. The airtightness of the test piece is determined by inspecting the amount of gas flowing out through the test piece forming one side of the sample. Therefore, the error at the time of the airtightness test generated by maintaining a vacuum state can be reduced, and a more accurate airtightness test is attained.

In addition, unlike the conventional airtightness tester to maintain a vacuum state, in the present invention, after placing the test piece inside the housing, the test piece is sealed between the test piece and the pressure chamber, and the airtightness is checked by maintaining a high pressure in the pressure chamber. At this time, the test piece is easily detachable from the housing.

In addition, since the size of the test piece can be increased by increasing the size of the housing of the airtightness tester, a test piece of a large size can be inspected using the airtightness tester according to an embodiment of the present invention.

Although the airtightness testing apparatus according to an embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments presented herein, and those skilled in the art to understand the spirit of the present invention are within the scope of the same idea. Other embodiments may be easily proposed by adding, changing, deleting, or adding components, but this will also fall within the spirit of the present invention.

1 is a schematic diagram of an airtightness testing apparatus according to the prior art,

2 is a plan view of a test piece installed in the airtightness testing device of FIG.

3 is an exploded perspective view of the test piece of FIG. 2,

4 is an enlarged view of a section A-A 'of FIG.

5 is a schematic diagram of an airtightness testing apparatus according to an embodiment of the present invention;

Figure 6 is an exploded perspective view of the pressure chamber and the test piece installed in the housing of the airtightness testing apparatus according to an embodiment of the present invention.

Explanation of symbols on main parts of drawing

2 first adherend 4 adhesive layer

6 Second adherend 10 Leak test device

20 Specimen 22 Support Plate

30 housing 70 vacuum pump

80 Pressure Sensor 100 Leak Detection Device

110 housing 120 pressurization chamber

130 pressure board 140 air pump

150 Pressure Pump 160 Adhesive

170 detector

Claims (8)

A housing having an opening formed on one surface thereof; A test piece provided on the inner side of the open portion side of the one surface; A pressurizing chamber located inside the housing and positioned such that the test piece forms one side; A seal member detachably installed between the test piece and the pressure chamber; Pressurizing means for pressurizing the pressurizing chamber toward the test piece side on which the seal is located; And And pressure regulating means connected to said pressure chamber to maintain a constant pressure inside said pressure chamber. The method of claim 1, The test piece, An opening having an opening formed thereon; A first adherend disposed to cover the opening of the support plate; An adhesive layer applied on the first adherend; A second adherend adhered onto the adhesive layer, When the test piece is installed in the opening of the housing, an opening is formed in the first adherend so that one surface of the second adherend is exposed to the outside. The method according to claim 1 or 2, The pressurizing means An air bag into which air can be injected; And An airtightness testing device, characterized in that the pressure distribution plate for uniformly dispersing the pressure applied to the pressure chamber by the air bag. The method according to claim 1 or 2, And the pressure regulating means is a pressure pump for introducing the same gas as the gas inside the pressurizing chamber into the pressurizing chamber. The method of claim 4, wherein And a flow meter for measuring the amount of gas introduced by the pressure pump. The method according to claim 1 or 2, And a pressure sensor for measuring the pressure in the pressurization chamber. The method according to claim 1 or 2, And a detector for detecting a gas exiting the test piece in accordance with the pressure exerted by the pressurization chamber. The method according to claim 1 or 2, The gas inside the pressurization chamber is air or an inert gas.

Images