JPH0972815A - Leakage detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact leakage detector for detecting the leak (pressure leak) of a member to be inspected over the entire circumference of seal ring groove part thereof surely and conveniently while simplifying the structure. SOLUTION: The leakage detector comprises a sealing member 1 to be fitted tightly in the seal ring groove part S of a member W to be inspected, and a housing 2 for holding the sealing member 1. The sealing member 1 is made of an elastic material into a ring with a working pressure chamber 11 being formed therein over the entire circumference. The housing 2 is formed into a ring having open inner (or outer) circumferential side and provided with a working pressure introduction port 21 communicating between a working pressure supply and the working pressure chamber 11 of the sealing member 1. The sealing member 1 is disposed removably in the housing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak inspector for inspecting a product (member to be inspected) cast by die casting or the like, which has a casting defect such as a cracked cavity or a pinhole. In particular, the present invention provides a leak inspector suitable for inspecting a seal ring groove formed in a circular ring shape on a member to be inspected. By the way, an O-ring, packing (seal ring), gasket, or the like is installed in the groove of the seal ring groove portion.

[0002]

2. Description of the Related Art Conventionally, when inspecting a leak in a seal ring groove of this type, the method shown in FIGS. 9 to 11 has been used.

FIG. 9 shows the seal ring groove S.
Utilizing the fluid passage (oil hole) b formed in the vicinity of
A leak (pressure leakage) from the seal ring groove S is detected by sealing the fluid passage (oil hole) b with a blind plug c before supplying the oil communication hole a and then supplying an operating pressure to the inside. To do. According to this method
Although a special leak inspection device is not required, there is a problem that not only the seal ring groove S portion near the fluid passage (oil hole) b can be detected but also defects existing in the outer peripheral portion and the side portion of the seal ring groove S cannot be detected. is there.

The ones shown in FIGS. 10 and 11 are
A ring-shaped or plate-shaped elastic member d is wound around the outer periphery of the seal ring groove S and is tightened with a tightening band e to seal. According to this method, it is possible to detect a leak (pressure leakage) around the entire circumference of the seal ring groove S after forming the oil communication hole a, but it is difficult to obtain stable sealing performance due to the sealing by the tightening band. However, the tightening band is often tightened excessively to improve the sealing performance, resulting in poor durability and poor workability in setting and removing in the seal ring groove, and inspecting when setting in the seal ring groove. There are many restrictions due to the shape of the members.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and can easily, quickly and surely detect a leak (pressure leak) around the entire circumference of the seal ring groove of a member to be inspected. It is possible to provide a leak tester that is capable of being assembled and has a simple assembly configuration and is compact (small and lightweight).

[0006]

A leak detector according to the present invention which achieves the above object comprises a sealing member which closely seals with a seal ring groove portion of a member to be inspected and a housing which holds the sealing member. The sealing member is formed of a material having elasticity into a circular ring shape, and the working pressure chamber is formed inside the entire circumference, and the housing is formed into a circular ring shape with an inner peripheral side (or an outer peripheral side) being opened. At the same time, an operating pressure introducing port for communicating the operating pressure supply source with the operating pressure chamber of the sealing member is formed, and the sealing member is detachably accommodated and installed in the housing.

At this time, the sealing member is formed in a circular ring shape with the outer peripheral side (or inner peripheral side) being open,
A flange piece is formed over the entire circumference at the circumferential opening edge toward the inside, and the outer surface side of the flange piece is brought into close contact with the inner peripheral surface of the open side of the housing, and at the same time the inner surface side of the flange piece is It is also possible to closely contact the Plesser ring formed by forming a through hole that connects the working pressure chamber of the sealing member and the working pressure introducing port. Further, it is preferable that the housing includes a housing body and a circular annular plate that covers a side peripheral surface of the housing body.

Further, the housing is fixedly installed on the inspection jig board, and the working pressure introducing port of the housing is connected to the working pressure introducing passage formed in the inspection jig board so as to communicate therewith. The inspection jig board is provided with a connector protruding from the fluid passage formed in the member to be inspected, and the connector is communicated with the fluid introduction passage formed in the inspection jig board. Is also good.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A leak detector A according to the present invention is
Basically, it is possible to inspect a seal ring groove S (illustrated in the figure) formed on the outer periphery of the projecting portion of the member to be inspected W or a seal ring groove portion formed on the inner periphery of the member to be inspected W, basically. The sealing member 1 includes a sealing member 1 that closely seals the seal ring groove S of the member W to be inspected, and a housing 2 that holds the sealing member 1.

The sealing member 1 is formed into a circular ring shape (donut ring shape) using a rubber material or a synthetic resin material having elasticity so as to be easily brought into close contact with the surface of the seal ring groove portion S of the member W to be inspected. The working pressure chamber 11 is formed over the entire circumference. That is, this sealing member 1
May be formed in a circular ring shape having a substantially circular cross section like a tire tube, or may be formed in a circular ring shape having a substantially concave cross section in which the outer peripheral side (or inner peripheral side) is opened as in the illustrated embodiment. Is also good.

When the sealing member 1 is formed in a circular ring shape with the outer peripheral side being open as in the illustrated embodiment, the seal ring groove S formed on the outer periphery of the protruding portion of the member W to be inspected is inspected for leaks. On the contrary, when the inner peripheral side is formed into a circular ring shape with an open inner side, the leak inspection of the seal ring groove S formed on the inner peripheral side of the member W to be inspected can be performed. It will be easily understood. The working pressure used is air, water,
Oil, inert gas, etc. can be used.

In the following description, the sealing member 1 will be mainly described with reference to the illustrated embodiment in which the sealing member 1 is formed in a circular ring shape with its outer peripheral side being opened.

At the circumferentially open edge 12 of the sealing member 1,
Collar piece 13 for improving the sealing property in the working pressure chamber 11
Are formed over the entire circumference of the sealing member 1. At this time, the collar piece 13 is provided with the circumferential opening 1 as shown in FIG. 2 and FIG.
2 from both sides inward, or FIG.
It is formed toward the outside as shown in FIG. 4A, or toward the inside and outside as shown in FIG.

The seal ring groove S of the member W to be inspected
On the inner peripheral surface 14 of the sealing member 1 that is in direct contact with the seal member 1, inspection pressure communication grooves 15 and 16 are formed according to the application of the seal ring groove portion S of the member W to be inspected. That is, when an O-ring is installed in the seal ring groove portion S of the member W to be inspected, defects such as cavities existing at the outer position of the seal ring groove portion S are problematic because they seal at the inner and outer circumferences of the seal ring groove portion S. Therefore, the inner peripheral surface 14 of the sealing member 1 may be flat, but when the seal ring is installed in the seal ring groove S, the seal ring groove S is sealed with the outside of the seal ring groove S so that the seal ring groove S is sealed. Since defects such as blowholes existing in the outer peripheral portion and the side portion pose a problem, as shown in FIGS. 3 and 5, the inspection pressure for leak inspection is also applied to the inner peripheral portion of the seal ring groove S. A circumferential inspection pressure communication groove 15 and / or an axial inspection pressure communication groove 16 is formed on the inner peripheral surface 14 of the sealing member 1. At this time, the width of the inner peripheral surface 14 of the sealing member 1 is set to be slightly larger than the width of the seal ring groove portion S, and the width of the inspection pressure communicating groove 15 in the circumferential direction is set to the groove wall s ′ inside the seal ring groove portion S. _It is set to be smaller than the width L ₁ between ₁ and s ′ _{2, and} the length of the inspection pressure communicating groove 16 in the axial direction is set so that both ends thereof are in the middle of the left and right seal ring grooves s ₁ and s ₂ of the seal ring groove portion S. Set to be positioned. By doing so, the seal ring groove S can be surely sealed to ensure accurate leak inspection.

The housing 2 is made of a metal material, a synthetic resin material, or the like having sufficient rigidity to hold the sealing member 1, and is formed into a circular ring shape having a substantially concave cross-section with an open inner peripheral side (or outer peripheral side). At the same time, the working pressure supply port (not shown) and the working pressure introducing port 21 for communicating the working pressure chamber 11 of the sealing member 1 are formed.

The housing 2 is a housing body 2.
a and one or two circular annular plates 2b covering the side peripheral surface thereof, the housing main body 2a and the circular annular plate 2b are separably integrated with a plurality of screws 22, and the housing main body 2a The working pressure introducing port 21 is formed in the above, and a joint pipe 23 for connecting a hose connected to a working pressure supply source is connected to the working pressure introducing port 21. The number of housings 2 is not limited to one at the time of use, but a plurality of housings 2 may be integrally stacked depending on the width of the seal ring groove portion S as shown in FIG.

Then, the sealing member 1 is taken out from the housing 2 and is removably accommodated and installed therein. At that time, the collar piece 1 formed on the circumferentially open portion 12 of the sealing member 1
The outer surface side of 3 is brought into close contact with the inner peripheral surface 24 on the open side of the housing 2, and at the same time, the pusher shear ring 3 is brought into close contact with the inner surface side of the collar piece 13.

The pusher shirring 3 is for ensuring a tight sealing property of the working pressure chamber 11 in the sealing member 1 by applying a tightening force to the flange 13 of the sealing member 1, and the flange 13 of the sealing member 1 is provided. A circular ring having a substantially convex cross-section having an outer diameter along the inner surface is formed, and a plurality of through holes 31 for communicating the working pressure chamber 11 of the sealing member 1 and the working pressure introducing port 21 of the housing 2 are formed. Then, the shoulder portion is brought into close contact with the inner surface side of the collar piece 13 of the sealing member 1.

Then, a method of using the leak detector A will be described (see FIG. 7). (A) In advance, an oil communication hole a communicating with the fluid passage (oil hole) b is formed in the seal ring groove portion S of the member to be inspected W, and the leak inspection device A is attached to the seal ring groove portion of the member to be inspected W. Set to the outer peripheral position of S. In this embodiment, it is possible to carry out the inspection work while holding the leak inspection device A by hand. After that, the working pressure introducing port 21 of the housing 2 is passed through the joint pipe 23 connected to the working pressure supply source.
The operating pressure, for example, air is supplied from the inside into the operating pressure chamber 11 of the sealing member 1.

Then, (b) the internal pressure of the working pressure chamber 11 of the sealing member 1 rises, and the inner peripheral surface 1 of the sealing member 1 increases.
The entire 4 is elastically deformed (bulged) toward the center (toward the seal ring groove S), and the entire inner peripheral surface 14 of the sealing member 1 is in close contact with the outer periphery of the seal ring groove S to seal the seal ring groove S.

In this state, (c) inspection pressure (air or water pressure or hydraulic pressure) for leak inspection from the fluid passage (oil hole) b of the member W to be inspected to the seal ring groove S through the oil communication hole a. To send. At this time, if there is a casting defect such as a cracked porosity or a pinhole in the seal ring groove S, air (or water or oil) leaks from the defect, and the existence of the defect can be seen.

Next, the leak detector described in claim 6 of the present invention will be explained based on FIG. 8 showing an example of its implementation. The configuration and operation of the leak tester A ′ itself are almost the same as those described above, and the same components are designated by the same reference numerals and the description thereof will be omitted.

In this leak inspection device, a housing 2 accommodating and installing a sealing member 1 is mounted on an inspection jig board 4 with screws 5.
Installed in a fixed state with the working pressure introducing passage 4 in which the working pressure introducing port 21 of the housing 2 is bored in the inspection jig board 4.
1, and the inspection jig board 4 is connected to the inspection target member W.
A connector 42 connected to a fluid passage (oil hole) b formed in the above is provided in a protruding manner, and the connector 42 is connected to a fluid introduction passage 43 which is bored inside the inspection jig board 4. Is. Reference numeral 45 in the figure denotes a clamp for fixing the member W to be inspected.

In the embodiment shown in FIG. 8, the inspection jig board 4 is formed with a pressure detection passage 44 communicating with the inside (inner space) 6 of the member W to be inspected. Therefore, according to this leak inspector, it is possible to simultaneously inspect leaks (pressure leaks) in other passages and leaks in the entire member W to be inspected.

[0025]

Since the leak detector of the present invention is constructed as described above, it is possible to detect the leak (pressure leak) around the entire seal ring groove of the member to be inspected easily, quickly and surely. That is, the leak inspection device is set (fitted) in the seal ring groove portion of the member to be inspected, and only by supplying the working pressure into the working pressure chamber of the sealing member, the entire circumference of the seal ring groove portion of the member to be inspected is reliably sealed. It is possible to do. Therefore, the workability of setting and removing the seal ring groove portion is good, and the leak inspection work can be performed easily and quickly.

Moreover, it is basically composed of only one sealing member and one housing, and in combination with the small number of constituent members, it is easy to assemble and can be manufactured at low cost.
It can be made compact.

Further, according to the width of the seal ring groove of the member to be inspected, it is possible to use a plurality of housings (leak inspectors) integrally and superimpose them, and it is possible to make a compact structure. Together, the scope of application becomes wider.

According to the leak detector of the second aspect, even if the sealing member is damaged by repeated use,
Since it is possible to easily replace only the sealing member, it is possible to reduce the cost.

According to the leak detector of the third aspect, since the sealing member can be manufactured by a relatively simple manufacturing type, the sealing member can be manufactured at a lower cost and the cost can be further reduced. Can be realized.

Further, according to the leak detector of the fourth aspect, even when the sealing member is formed in a circular ring shape with the outer peripheral side (or the inner peripheral side) being opened, the operating pressure formed in the sealing member. The airtightness of the room can be improved.

According to the fifth aspect of the leak inspector, the housing itself can be easily manufactured, and the sealing member can be easily housed and taken out, and the circular annular plate is attached to the housing body. By tightening, the sealing member can be given a tightening force, and as a result, the airtightness of the working pressure chamber of the sealing member can be improved.

According to the leak inspecting device of the sixth aspect, not only the leak inspection of the seal ring groove portion of the inspected member but also the leak inspection of the fluid passage (oil hole) formed in the inspected member is performed at the same time. You can do it.

[Brief description of drawings]

FIG. 1 is a front view showing an example of implementing the present invention.

FIG. 2 is a sectional view taken along line (X)-(X) of FIG.

FIG. 3 is a cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 4 is a sectional view of a main part showing another embodiment of the sealing member according to the present invention.

FIG. 5 is a cross-sectional view illustrating the relationship between the sealing member and the seal ring groove portion according to the present invention.

FIG. 6 is a cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 7 is a sectional view of an essential part for explaining the method of using the present invention.

FIG. 8 is a sectional view showing still another embodiment of the present invention.

FIG. 9 is a sectional view illustrating a conventional example.

FIG. 10 is a sectional view showing a conventional example.

11 is a sectional view taken along line (Y)-(Y) of FIG.

[Explanation of symbols]

A: Leak inspector S: Seal ring groove W: Inspected member a: Oil communication hole b: Fluid passage (oil hole) 1 ... Sealing member 11 ... Working pressure chamber 12 ... Circumferential opening edge 13 ... Collar piece 14 ... Inner peripheral surface 15, 16 ... Groove for communication of inspection pressure 2 ... Housing 2a ... Housing body 2b ... Circular annular plate 21 ... Operating pressure inlet 22 ... Screw 23 ... Joint pipe 24 ... Inner peripheral surface 3 ... Pressure ring 31 ... Through hole 4 ... Inspection jig board 41 ... Operating pressure introduction passage 42 ... Connector 43 ... Fluid introduction passage 44 ... Pressure detection passage 45 ... Clamp 5 ... Screw 6 ... Inside of inspected member W ( Inner space)

Claims (6)

[Claims] 1. A leak inspector for inspecting a leak in a seal ring groove of a member to be inspected in which a fluid passage is formed in the vicinity of the seal ring groove, the seal intimately sealing the seal ring groove of the member to be inspected. And a housing that holds the sealing member. The sealing member is formed of a material having elasticity into a circular ring shape and has an operating pressure chamber formed all around the inside thereof. Circumferential side (or outer peripheral side)
And a working pressure introducing port that connects the working pressure supply source and the working pressure chamber of the sealing member to each other. 2. The leak detector according to claim 1, wherein the sealing member is detachably accommodated and installed in the housing. 3. The sealing member is formed in a circular ring shape with an outer peripheral side (or an inner peripheral side) being open, and the circumferential opening edge is brought into close contact with the inner peripheral surface of the housing on the open side. The leak inspection device according to claim 1. 4. The sealing member is formed in a circular ring shape with an outer peripheral side (or an inner peripheral side) being opened, and a flange piece is formed on the opening edge of the circumference toward the inside so as to cover the entire circumference. The outer surface is brought into close contact with the inner peripheral surface on the open side of the housing, and at the same time, a through hole is formed on the inner surface side of the collar piece for allowing the working pressure chamber of the sealing member and the working pressure introduction port of the housing to communicate with each other. The leak inspection device according to claim 1, wherein the pre-shearing is made in close contact. 5. The leak detector according to claim 1, wherein the housing comprises a housing main body and a circular annular plate covering a side peripheral surface of the housing main body. 6. The housing is fixedly installed on an inspection jig board, and an operating pressure introducing port of the housing is connected to an operating pressure introducing passage formed in the inspection jig board so as to communicate therewith. On the inspection jig board, a connector connected to the fluid passage formed on the member to be inspected is projected, and the connector is connected to the fluid introduction passage formed on the inspection jig board. The leak detector according to claim 1, wherein the leak detector is a leak detector.