JPH02309064A - Seal method and leakage checking jig using seal method thereof - Google Patents

Abstract

PURPOSE:To allow sealing even if a contact face has some steps, irregularities or seam portions with steps by arranging a gelatinous packing material on the face to be sealed, and sealing the optionally shaped face with elastic deformation. CONSTITUTION:A projection 5 with the reduced inner volume to increase leakage detection sensitivity is provided on a flat plate-shaped supporter 1 as the guide of a body to be checked 4. A vacuum pump 8 is operated, the body to be checked 4 is covered on the projection 5 while air is sucked through an air suction hole 2, and the opening portion of the body to be checked 4 is brought into contact with a gelatinous packing 3. When the opening portion of the body to be checked 4 is brought into contact with the gelatinous packing 3, the body to be checked 4 is further pressed to the gelatinous packing 3 by the outside air pressure. The gelatinous packing 3 is elastically deformed by this pressing force, it is deformed according to the shape of a step 4A, and the other portions as well as the portion of the step 4A can be completely sealed.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is useful for preventing leakage, for example, from vertical grains in the plates of large structures such as vessels and vessels that have a step at the opening, such as a container with a stepped opening. The present invention relates to a sealing method that can be used to inspect for presence, etc., and a leakage inspection jig using this sealing method.

``Prior Art'' Leak tests have conventionally been carried out to test whether the seals of various containers, gas appliances, waterproof equipment, etc. are complete.

Leak testing is performed by connecting an air suction port or a pressurized air outlet to the test object, sucking the air inside the test object, or supplying pressurized air to the test object. A method of determining the presence or absence of a leak by looking at changes in the air pressure inside the test object, and a method of connecting an air suction means to the test object, sucking the air inside the test object, and placing a flow meter on the suction path. However, there is also a method of determining whether there is a leak in the test object by checking whether or not the air flow disappears.

``Problem to be Solved by the Invention'' In any case, conventional leakage testing requires that the tester be able to be connected in a completely sealed state.

For this purpose, for example, containers with a stepped opening made of overlapping sheets of paper such as a paper cup, structures with a stepped but large area such as the vertical grain of a roof board, and the exterior of a ship. Structures such as plate joints cannot be tested for leaks in the manner described above.

"Means for Solving the Problem" The first invention of this application provides a sealing method in which a gel-like packing material is arranged on a surface to be sealed, and a surface of an arbitrary shape can be sealed by elastic deformation of the gel-like packing material. This is a proposal.

According to the sealing method according to the first aspect of the invention, even if there are steps or slight irregularities on the surface to be sealed, the gel-like packing material can be deformed according to the shapes of these steps and irregularities. Therefore, surfaces of any shape can be sealed within the elastically deformable range of the gel-like packing material.

In the second invention of this application, a support body having air suction holes;
We have proposed a leak testing jig with a structure in which a gel-like packing material is placed around the entire circumference of the object in contact with the support so as to include the part where the air suction hole is formed inside. be.

According to the leak testing jig according to the second invention, by bringing the adhered surface of the gel packing material into contact with the object to be inspected and sucking air from the air suction hole, the space surrounded by the support and the object to be inspected can be removed. It becomes a negative pressure state. As a result, a pressure contact force is generated between the support body and the object to be inspected in mutually opposing directions due to the external air pressure, and the gel-like packing material disposed therebetween is pressed against the support body and the object to be inspected.

As a result, the gel-like packing material is elastically deformed according to the shape of the object to be inspected due to the pressure contact force, and even if the surface of the object to be inspected has some level difference, unevenness, or distortion, the gel-like packing material will be able to maintain its shape. It elastically deforms according to the shape of the object to be inspected and seals between the object to be inspected and the support.

Therefore, according to the jig of the second invention, it is possible to connect a support body having an air suction hole to an object to be inspected having a contact surface of any shape in a sealed state, and as a result, a contact surface of any shape A leak test can be performed on a test object having a surface.

In the third invention of this application, when there are predetermined portions where steps, unevenness, distortions, etc. exist on the contact surface of the object to be inspected, gel-like packing is applied only to the portions that come into contact with these steps, unevenness, distortions, etc. We have proposed a leak testing jig with a structure in which a packing material made of a harder material than the gel-like packing material is arranged in the other opposing parts.

When configured in this way, the amount of gel packing material used can be reduced, improving durability and reducing costs.

"Example" FIG. 1 shows an example of a leak testing jig according to the second invention of this application, and the sealing method proposed in the first invention will be explained using this example.

In the figure, 1 is a support, 2 is an air suction hole provided in this support 1, 3 is a gel-like packing material adhered to the support 1, and 4 is an object to be inspected.

In this example, as the object 4 to be inspected, a case is shown in which the object to be inspected 4 is a gimlet tip having a step 4A on the opening surface as shown in FIG. In other words, in the case of Gikotsupu, both ends of paper are overlapped to form a cylinder. Therefore, a step 4A corresponding to the thickness of the paper is formed at the portion where the papers are overlapped and bonded.

In the jig shown in FIG. 1, the support 1 is shown as a flat plate in this example, and serves as a guide for easily mounting the object 4 to be inspected on the flat support 1.

Also, a protrusion 5 is provided to reduce the internal volume and increase leakage detection sensitivity.
will be established. The protrusion 5 is formed in a shape slightly smaller than the internal space of the object to be inspected 4, and the air suction hole 2 is formed on its upper surface.

An air suction hole 2 passes through the protrusion 5 and the support 1, is connected to a pipe 6 on the lower surface of the support 1, and is connected to a vacuum pump 8 through a flow meter 7.
connected to.

A gel packing 3 is applied in a ring shape around the base of the protrusion 5.

The gel packing 3 is made of a viscoelastic resin material such as konjac. A resin material having viscoelasticity such as konnyaku can be made of a material whose main components are silicone, urethane, and urethane, and a resin material having a hardness of 10 degrees or less on the hardness scale for rubber is used. Specifically, it is possible to use a resin material sold by Chemical Co., Ltd. under the trade name ``Chemic Gel,'' which is made hard enough to maintain its shape by adding additives to the resin material on sale.

It is preferable that the gel packing 3 be as thick as possible within a range of about 3 to 6 thick. Further, the width W of the ring-shaped gel packing 3 should be such that the opening surface of the object to be inspected 4 can be reliably placed on the gel packing 3. In this example, the test object 4 has a structure in which the opening part of the test object 4 is guided to the gel banking 3 by the protrusion 5, so the width W is the diameter of the base of the protrusion 5 and the opening part of the test object 4. The width may be selected to be slightly larger than the maximum value of the difference in diameter.

The protrusion 5 serves not only to guide the opening portion of the object 4 to be inspected onto the gel banking 3 but also to reduce the internal volume of the object 4 to be inspected. Therefore, the protrusion 5 is made of solid metal or resin molded product.

According to this implementation structure, the vacuum pump 8 is operated and the test object 4 is placed over the protrusion 5 while air is sucked from the air suction hole 2, and the opening part of the test object 4 is covered with the gel packing 3.
abuts on top of.

When the opening of the object to be inspected 4 comes into contact with the gel-like packing 3, the air pressure inside the object to be inspected 4 decreases rapidly, and the object to be inspected 4 partially collapses into the gel-like packing 3 due to the external pressure.
is pushed towards.

Due to this pressure contact force, the gel packing 3 is elastically deformed,
It deforms according to the shape of the step 4A, and not only the portion of the step 4A but also other portions become completely sealed.

Therefore, if the flow rate is not detected by the flow meter 7 in this state, it is determined that there is no leak, and if the flow rate continues to be detected by the flow meter 7, it is determined that there is a leak. This judgment is 1-2
This is done in a short amount of time, about seconds.

FIG. 3 shows an embodiment of the third invention of this application.

In this embodiment, a gel packing 3 is applied to a part of the ring, and the remaining part is made of a packing material 9 having a hardness greater than that of the gel packing 3. In this case, the thickness of the gel packing 3 is preferably selected to be slightly larger than that of the packing material 9, as shown in FIG.

The packing material 9 can be made of, for example, a two-component silicone compound, and is selected to have a hardness of about 30 degrees on the rubber hardness scale.

In this way, when only a part of the gel buffing 3 is used, the portion of the object 4 having the step 4A is covered with the gel buffing 3.
By bringing the portion of the step 4A into contact with the gel packing 3, the portion to the step 4 is sealed by the gel packing 3, and the other portions are sealed by the packing 9. Therefore, a leakage test can be performed on a container having a step 4A in the same way as when the gel packing 3 is used all around the circumference.

Furthermore, according to the embodiment shown in FIG. 3, since the amount of gel packing 3 used can be reduced, the rate of breakage of gel banking 3 can be reduced.

Therefore, it is possible to provide a leakage testing jig with high reliability and durability.

Furthermore, since the amount of gel packing 3 used is small, a cost reduction effect can be expected.

FIG. 5 shows a modified embodiment of the second invention of this application. This example shows an embodiment of a leakage testing jig used when the object to be tested is flat.

In other words, this example shows a case in which the support 1 is shaped like a container, and the gel packing 3 is applied to the entire circumference of the open end surface of the container-shaped support 1. An air suction hole 2 is formed in a portion corresponding to the bottom surface of the support 3, and a tube 6 is read directly into the air suction hole 2. Although not shown here, the pipe 6 is connected to a flow meter 7 and a vacuum pump 8 as shown in FIG.

By forming the jig into a container structure in this manner, a flat plate-shaped object to be inspected can be inspected.

In other words, as shown in FIG. 6, by bringing a jig into contact with the joint part 11 of welded steel plates, for example, slight distortions formed in the joint part 11 can be removed by elastic deformation of the gel-like packing 3, thereby sealing the joint part 11. The joint portion 11 can be inspected for leaks.

Furthermore, even if the joint portion 11 has a step formed by overlapping plates formed by sheet metal processing, the step portion can be sealed by bringing the gel packing 3 of the jig into contact with this joint portion. Therefore, the joint portion 11 can be inspected for leaks.

In this case, the gel-like packing 3 can be arranged around the entire circumference, or the gel-like packing can be applied only to the part where the seam 11 comes into contact, and the choice is free.

Further, when the object to be inspected is limited to a flat plate-like object, the support 1 can be formed into a flat plate-like shape as shown in FIG. When the support 1 is shaped like a flat plate as described above, the support 1 can be easily made to have a large area, so that it can be used as a jig for leakage testing over a relatively wide area.

Further, as shown in FIG. 8, for example, in a sheet metal workpiece, a joint portion 11 of a plate is formed in a groove, and a leakage test can be performed to check whether the seal at this joint portion is complete.

In such a case, as shown in FIGS. 8 and 9, a support L is formed by combining a flat support plate IA with a support strip IB having a cross-sectional shape that matches the cross-sectional shape of the groove. 1 is prepared, a frame-shaped gel banking 3 is attached to the support 1, and the gel packing 3 is applied so as to surround the bottom of the groove and the circumference of the groove as shown in FIG. By bringing it into contact with the groove, the presence or absence of leakage at the joint portion 11 in the groove can be inspected. In this way, leakage inspection on three-dimensional curved surfaces can also be performed.

"Effects of the Invention" As explained above, according to the present invention, by using gel-like packing, the shape of the contact surface may have some steps, an uneven surface, or a three-dimensional curved surface. Even if there are joint portions with steps, these step portions or uneven surfaces are sealed by the elastic deformation of the gel packing.

Therefore, it is possible to perform leakage inspections on the joints or joints of plates of processed sheet metal products, the joints on the outer panels of ships, etc., which could not be tested in the past, and the effectiveness of this method is great in practical use. It's large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the second invention of this application, FIG. 2 is a perspective view showing an example of an object to be inspected by this embodiment, and FIG. 3 is a perspective view of an embodiment of the third invention of this application. 4 is a side view thereof, FIG. 5 is a sectional view showing a modified embodiment of the second and third inventions of this application, and FIG. 6 is an embodiment shown in FIG. 5. FIG. 7 is a sectional view showing still another modified embodiment of the second and third inventions of this application, and FIG. FIG. 9 is a sectional view showing still another modified embodiment of the second and third inventions of this application, and FIG. 9 is a perspective view for explaining the structure of the leakage testing jig used in the embodiment of FIG. be. 1: Support body, 2: Air suction hole, 3 Nigel-like packing, 7 King, 4: Test object. Patent applicant: Cosmo Keiki Co., Ltd. Sunrise Industries Co., Ltd.

Claims (3)

[Claims] (1) Place gel packing material on the surface to be sealed,
A sealing method characterized in that a surface of any shape can be sealed by elastic deformation of a gel-like packing material. (2) A: a support body equipped with air suction holes; and B: a gel-like packing material supported by this support body and disposed around the entire circumference of the shape in which the test object is in contact with the support body; A leak inspection jig comprising: (3) A: a support body equipped with air suction holes; B: a gel-like packing material supported by this support body and disposed at a portion where a stepped portion of the test object is in contact with the support body; , C. An elastic packing material placed in a portion where another test object is in contact with which the gel packing material is not placed, and a leakage testing jig comprising: