JP2010008249A - Bellows leak inspecting implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bellows leak inspecting implement of a simple constitution. <P>SOLUTION: The bellows leak inspecting implement 1 is provided for inspecting a leak of bellows by detecting a leakage of air supplied into the bellows 2. The implement has a lower-side housing 3 which holds the bellows 2 to be inspected and seals the lower end of the bellows 2, a guide tube 12 which has an air supply hole 13 provided for supplying the air into the held bellows 2, and an upper lid 9 which closes the upper end of the lower-side housing 3, and includes an air supply part 4 which seals the upper end of the bellows 2. The lower housing 3 is provided with an air release hole 8 for releasing the air that leaks out of the held bellows 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a jig for inspecting leakage due to pinholes or the like generated in a bellows.

As a leak inspection apparatus for a bellows, for example, an apparatus for inspecting a leak by blowing a gas for leak detection onto the bellows from the outside and detecting the gas inside the bellows is known (for example, Patent Document 1). reference.). In addition, there are Patent Documents 2 and 3 as prior art documents related to the present invention.
Japanese Patent Laid-Open No. 10-148594 Japanese Utility Model Publication No. 1-91087 Utility Model Registration No. 2606226

  In the apparatus described above, a leak detection gas and a sensor for detecting the gas are necessary, and the apparatus and the inspection procedure may be complicated.

  Therefore, an object of the present invention is to provide a bellows leak inspection jig having a simple configuration.

  The bellows leak inspection jig of the present invention is a bellows leak inspection jig (1, 1A) for inspecting a leak of a bellows by supplying air into the bellows (2, 21) and detecting the leak. And a guide tube provided with a lower housing (3, 3A) for accommodating the bellows to be inspected and sealing the lower end of the bellows, and an air supply hole (13) for supplying air to the inside of the accommodated bellows. 12) and an upper lid (9) for closing the upper end of the lower housing, and air supply means (4) for sealing the upper end of the bellows, and fixing the lower housing and the air supply means Fixing means (5), and the lower housing is provided with an air vent hole (8) for discharging air leaked from the accommodated bellows, thereby solving the above-mentioned problem.

  According to the bellows leak inspection jig of the present invention, the upper end and the lower end of the bellows are formed by closing the upper lid and fixing with the fixing means while inserting the guide tube inside the bellows to be inspected accommodated in the lower housing. Sealed. When air is supplied from the air supply hole to the inside of the bellows and a leak is generated in the bellows due to a pinhole, a crack or the like, the air leaks from the leak occurrence location. Since the leaked air is discharged from the air vent hole, it is possible to visually check whether or not the bellows leaks by placing a bellows leak inspection jig in a water tank or the like in which water is stored. Accordingly, the leak inspection of the bellows can be performed with a jig having a simple configuration. Therefore, for example, it is possible to easily inspect a bellows that has been completely replaced by regular repair of the filling machine, and it is possible to determine whether or not the bellows can be reused.

  In one form of the bellows leak inspection jig of the present invention, the bottom (3a) of the lower housing is provided with a protrusion (3b) having a size to fit inside the accommodated bellows. An O-ring (6) may be provided so as to go around the side surface. According to this form, the convex part provided in the bottom part of the lower housing fits inward from the lower end side of the bellows, and the lower end of the bellows is brought into contact with the O-ring provided on the side surface of the convex part. Is sealed. Thereby, the air leakage from the bellows lower end side can be prevented.

  In one form of the bellows leak inspection jig of the present invention, an O-ring (10) may be provided on the lower surface of the upper lid of the air supply means so as to surround the upper end opening of the accommodated bellows. According to this embodiment, the upper end of the bellows is bonded to the O-ring by closing the upper lid of the air supply means with respect to the lower housing, and the upper end of the bellows is sealed. Thereby, the air leak from the bellows upper end side can be prevented.

  In one form of the bellows leak inspection jig of the present invention, the fixing means may be a clamp (5). According to this aspect, the lower housing and the air supply means can be securely fixed by the clamp. Air leakage from the upper and lower ends of the bellows is prevented, and the reliability of inspection is improved.

  In one form of the bellows leak inspection jig of the present invention, the bellows to be inspected may be made of resin. According to this embodiment, it is possible to determine whether reuse is possible by inspecting the resin bellows. Conventionally, it is possible to reuse a resin bellows that has been discarded without being inspected, and the cost can be reduced.

  In addition, in the above description, in order to make an understanding of this invention easy, the reference sign of the accompanying drawing was attached in parenthesis, but this invention is not limited to the form of illustration by it.

  As described above, in the bellows leak inspection jig of the present invention, the upper and lower ends of the bellows are closed by closing the upper lid while inserting the guide tube inside the bellows to be inspected accommodated in the lower housing. Sealed. When air is supplied from the air supply hole to the inside of the bellows and a leak is generated in the bellows due to a pinhole, a crack or the like, the air leaks from the leak occurrence location. Since the leaked air is discharged from the air vent hole, it is possible to visually check whether or not the bellows leaks by placing a bellows leak inspection jig in a water tank or the like in which water is stored. Accordingly, the leak inspection of the bellows can be performed with a jig having a simple configuration. Therefore, for example, it is possible to easily inspect a bellows that has been completely replaced by regular repair of the filling machine, and it is possible to determine whether or not the bellows can be reused.

  FIG. 1 shows a schematic diagram of a bellows leak inspection jig according to one embodiment of the present embodiment, and FIG. 2 shows an assembly diagram of the bellows leak inspection jig. The bellows leak inspection jig 1 is a jig for inspecting a leak due to a pinhole or the like generated in a resin bellows 2 as shown in FIG. The bellows leak inspection jig 1 fixes a lower housing 3 that houses the bellows 2, an air supply unit 4 as an air supply unit that supplies inspection air, and the lower housing 3 and the air supply unit 4. And a clamp 5 as a fixing means. The lower housing 3 is a cylindrical container having a bottom 3a, and is formed of a metal such as stainless steel as an example. The lower housing 3 is provided with an O-ring 6 that seals the accommodated bellows 2, a packing 7 that supports the bellows 2, and an air vent hole 8. The O-ring 6 is provided inside the bottom portion 3 a so as to go around the side surface of the convex portion 3 b sized to fit into the inner side 2 a of the bellows 2, and is in close contact with the lower end inner side 2 a of the bellows 2. Thereby, the air leak from the bellows 2 lower end at the time of a test | inspection is prevented. The packing 7 holds the bellows 2 in contact with the lower side 2b of the upper edge of the bellows 2. The air vent hole 8 is a hole provided for confirming whether the bellows 2 has leaked. When a leak occurs, the air leaked from the leak occurrence portion is released from the air vent hole 8. In this embodiment, it is provided at one place, but the present invention is not limited to this, and the number and position of the air vent holes 8 may be changed as appropriate.

  The air supply unit 4 includes an upper lid 9 that closes the lower housing 3, an O-ring 10 that is provided on the lower surface of the upper lid 9 and seals the upper end of the bellows 2, an air introduction port 11 that introduces inspection air, and an introduction A guide tube 12 that guides the generated air and an air supply hole 13 provided in the guide tube 12 are provided. The air supply part 4 is also made of a metal such as stainless steel like the lower housing 3. The upper lid 9 overlaps with the flange 3 c provided at the upper end of the lower housing 3. The O-ring 10 contacts and seals so as to surround the opening at the upper end of the bellows 2 supported by the packing 7 of the lower housing 3. Thereby, the air leakage from the upper end of the bellows 2 at the time of inspection is prevented. The air introduction port 11 can be connected to an air introduction tube 14 for introducing air. The guide tube 12 is closed at the lower end, and has two air supply holes 13 arranged side by side in the vertical direction on the side surface. The air introduced from the air introduction port 11 is guided to the guide tube 12 and discharged from the air supply hole 13. As a result, air is supplied to the inside of the bellows 2 accommodated in the lower housing 3. The number and position of the air supply holes 13 may be changed as appropriate. The clamp 5 is fixed by sandwiching the flange 3 c of the lower housing 3 and the upper lid 9 of the air supply unit 4. The clamp 5 includes an opening / closing part 5a that can be attached to the flange 3c and the upper lid 9, and a fastening part 5b that closes and closes the opening / closing part 5a. The opening / closing part 5a is configured to be opened and closed by a hinge 5c, and is attached so as to sandwich the flange 3c and the upper lid 9. The fastening portion 5b is constituted by a screw mechanism, and closes and fixes the opening / closing portion 5a.

  Next, the leak inspection procedure of the bellows 2 by the bellows leak inspection jig 1 will be described. First, the bellows 2 to be inspected is accommodated in the lower housing 3, and the flange 3c and the upper lid 9 are overlapped while the guide tube 12 is inserted into the accommodated bellows 2, and the lower housing 3 and the air supply portion are overlapped. 4 is fixed with a clamp 5. At that time, the lower end of the bellows 2 is in close contact with the O-ring 6, and the upper end of the bellows 2 is in close contact with the packing 7 and the O-ring 10, thereby sealing the inside and the outside of the bellows 2 and preventing air leakage. Then, the bellows leak inspection jig 1 is put into a water tank (not shown) in which water is stored, and air is introduced into the air introduction port 11. FIG. 4 is a view for explaining the flow of air in the bellows leak inspection jig 1. The introduced air is supplied into the bellows 2 from the air supply hole 13 of the guide tube 12. The air pressure is set to 0.2 [Mpa]. The air pressure may be appropriately set according to the strength of the material and configuration of the bellows 2 to be inspected.

  If a leak occurs due to pinholes, cracks, or the like in the bellows 2, air leaks from the location where the leak occurred. The leaked air is discharged from the air hole 8. On the other hand, when no leak occurs, air does not leak from the inside of the bellows 2, so that air is not released from the air vent hole 8. The operator can determine whether or not a leak has occurred in the bellows 2 by observing the presence or absence of air released from the air vent hole 8.

  The present invention is not limited to the above-described form and can be implemented in various forms. In the present embodiment, the bellows leak inspection jig 1 for the bellows 2 whose both ends are open has been described. However, the configuration is not limited to this, and the configuration may be appropriately changed according to the shape of the bellows. For example, the bellows leak inspection jig of the present invention can be applied to the bellows 21 having different shapes as shown in FIG. The bellows 21 has a conical shape with one end 21 a closed, and the other end 21 b has the same configuration as the upper end of the bellows 2. FIG. 6 shows a schematic view of a bellows leak inspection jig 1A according to a modification of the present invention. Since the configuration of the bellows leak inspection jig 1A is the same as that of the bellows leak inspection jig 1 except for the lower housing 3A, the same reference numerals are given and description thereof is omitted. The lower housing 3A has a bottom portion 22 that is recessed in a conical shape so that one end side 21a of the bellows 21 is fitted therein. In addition, since the other structure of 3 A of lower housings is the structure similar to the lower housing 3, it attaches | subjects the same referential mark and abbreviate | omits description.

  The leak inspection procedure of the bellows 21 by the bellows leak inspection jig 1A is the same as that of the bellows leak inspection jig 1. The bellows 21 is accommodated in the lower housing 3 </ b> A, and the lower housing 3 </ b> A and the air supply unit 4 are fixed by the clamp 5. The bottom 22 of the lower housing 3A supports the one end side 21a of the bellows 21 so that the one end side 21a of the bellows 21 is fixed, while the other end side 21b is also fixed while being sealed by the packing 7 and the O-ring 10. The bellows leak inspection jig 1A is put into a water tank (not shown) in which water is stored, air is introduced into the air introduction port 11, and the presence or absence of leakage of the bellows 21 is inspected.

  Further, in the present embodiment, the resin bellows 2 has been described as an example of an inspection object, but the present invention is not limited thereto, and may be applied to a metal bellows. Although the bellows leak inspection jig 1 has been described as being made of metal, it is not limited to this and may be made of resin. The fixing of the lower housing 3 and the air supply unit 4 is not limited to the clamp 5. For example, the lower housing 3 and the air supply unit 4 may be fixed by providing a screw mechanism or the like.

The schematic diagram of the bellows leak inspection jig concerning one form of this form. Assembly drawing of bellows leak inspection jig. Schematic of bellows. The figure explaining the flow of the air in a bellows leak inspection jig. Schematic of the other example of a bellows. The schematic diagram of the bellows leak inspection jig concerning the modification of this form.

Explanation of symbols

1, 1A Bellows leak inspection jig 2, 21 Bellows 3, 3A Lower housing 4 Air supply part (air supply means)
5 Clamp (fixing means)
8 Air vent hole 9 Upper lid 12 Guide tube 13 Air supply hole

Claims (5)

A bellows leak inspection jig for inspecting a bellows leak by supplying air into the bellows and detecting the leak,
A lower housing that houses the bellows to be inspected and seals the lower end of the bellows;
An air supply means having an air supply hole for supplying air to the inside of the accommodated bellows and an upper lid for closing the upper end of the lower housing, and sealing the upper end of the bellows;
Fixing means for fixing the lower housing and the air supply means;
With
A bellows leak inspection jig, wherein the lower housing is provided with an air vent hole for discharging air leaking from the accommodated bellows.   The bottom of the lower housing is provided with a convex portion sized to fit inside the accommodated bellows, and an O-ring is provided so as to go around the side surface of the convex portion. Item 2. A bellows leak inspection jig according to item 1.   The bellows leak inspection jig according to claim 1 or 2, wherein an O-ring is provided on the lower surface of the upper lid of the air supply means so as to surround the opening at the upper end of the accommodated bellows.   The bellows leak inspection jig according to any one of claims 1 to 3, wherein the fixing means is a clamp.   The bellows leak inspection jig according to any one of claims 1 to 4, wherein a bellows to be inspected is made of a resin.

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