JP4594746B2 - Seal packing - Google Patents

Description

  The present invention relates to a seal packing that can be used, for example, when inspecting whether or not an engine block leaks, and a seal jig on which the seal packing is mounted.

As is well known, the engine block is configured by combining at least two block halves and forms a sealed combustion chamber or the like by the combination of the block halves. The engine block leakage inspection is not performed in the state of being assembled in the shape of the block, but is always performed in the state of the block half body. The reason is that when “leakage” is detected in the assembled state as a block, it cannot be determined which of the block halves constituting the engine block has the cause of leakage.
For this reason, in general, a leakage inspection of a test object composed of a complex such as an engine block is performed for each block half.

As is well known, leakage inspection is performed by sealing the opening of the object to be inspected, sealing the air inside the object to be inspected, and determining whether there is leakage by checking whether the air pressure is kept constant. Use an inspection method.
For this reason, a troublesome sealing jig is required to enclose air pressure in the state of a half-body to be inspected.
This will be briefly described with reference to FIGS. Reference numeral 1 shown in FIG. 7 indicates an object to be inspected in a state completed as a block. The device under test 1 is divided into halves 1A and 1B as shown in FIG. Here, the divided halves 1A and 1B are called sealed bodies. In order to inspect for leakage of the sealed bodies 1A and 1B, first, a lower jig 2 is prepared as shown in FIG. The lower jig 2 is provided with an elastic packing 3 laid so as to coincide with the extended surface shape of an edge (cut surface) surrounding the opening surface of the sealed body 1A or 1B. The elastic packing 3 has a concave groove formed on the surface of the lower jig 2, and the elastic packing 3 is inserted and held in the concave groove.

The elastic packing 3 is aligned with the edge portion surrounding the opening surface of the sealed body 1A, and the sealed body 1A is placed on the lower jig 2 as shown in FIG. Thereby, a flush opening surface is formed on the side portion. A sealing jig 4 (FIG. 10) is prepared for the opening surface, the side opening surface is sealed with the sealing jig 4, and a leakage inspection is performed.
The sealing jig 4 also has an annular groove formed according to the shape of the edge of the side opening surface, and an elastic packing 5 is mounted in the annular groove, and the side opening surface is formed by the elastic packing 5. Sealed.

  As described above, when a leak inspection of a semi-finished product is performed, a joint portion is generated between the sealed body 1A and the lower jig 2, and there is a problem that the seal is incomplete at the joint portion. That is, the elastic packing 5 is housed and held in a concave groove formed in the sealing jig 4 as shown in FIG. 11, but a part of the elastic packing 5 is held slightly protruding from the surface of the sealing jig 4. The protruding portion is pressed against the end face of the sealed body 1A and the end face of the lower jig 2 to obtain a sealing effect by deformation thereof. The conventional elastic packing has a softness of about 50 degrees or more in terms of JISA hardness. Since a relatively hard elastic material such as urethane rubber of about 70 degrees is used, the narrow groove formed at the seam is not blocked at the seam, which causes incomplete sealing at this part. This is shown in FIGS.

FIG. 12 shows a case where a narrow groove is formed between the sealed body 1A and the lower jig 2. FIG. FIG. 13 shows a state in which a step is generated between the sealed body 1A and the lower jig 2. Conventionally, it has been impossible to seal these narrow grooves or steps. Further, the corner portion P of the sealed body 1A shown in FIG. 14 could not be directly sealed. For this purpose, the sealing jig 4 is required.
In order to eliminate this inconvenience, since the thrust is insufficient in the conventional air cylinder, the sealing jig 4 is driven using a hydraulic cylinder, and the sealing jig 4 is attached to the end surfaces of the sealed body 1A and the lower jig 2. A method of pressing strongly and closing the narrow groove or step portion of the joint portion as much as possible is adopted.

  For this reason, the sealing device must have a strong structure so as to withstand the thrust force of the hydraulic cylinder, and the entire manufacturing cost of the sealing device becomes inconvenient. However, when a strong pressing force is applied using a hydraulic cylinder, the elastic packing 5 is remarkably deformed, resulting in an accident that it is torn or damaged in a short time. Even if it is pressed more strongly, the probability that the seam portion is necessarily blocked is small, and the reliability of the leak test is low. In addition, it is conceivable to use a gel packing having a low softness, for example, about 1 to 12 degrees in JIS hardness so that the shape of the discontinuous portion of the seal surface is well adapted. Since it is stable, it is difficult to stably hold the sealing jig. Even if it is practically used, the packing itself is deformed by the air pressure enclosed in the object to be inspected during the leak inspection, and this deformation changes the internal volume of the object to be inspected, causing a phenomenon as if leakage occurred There are drawbacks.

  An object of the present invention is to propose a seal packing structure capable of sufficiently closing a joint portion even with a thrust of an air cylinder, and a sealing jig using the seal packing.

  As a first embodiment of the present invention, the peripheral edge of the opening of the sealed body is in contact with the sealed body of the sealing jig that is pressed against the opening surface of the sealed body and seals the opening surface of the sealed body. In the elastic packing in which an annular groove is formed in accordance with the extended surface shape of the edge formed in the ring and is attached to the annular groove to seal the opening portion of the sealed body, the opening of the sealed body of the elastic packing A sealing packing comprising: an annular groove formed on a surface in contact with the peripheral edge of the outer peripheral surface; and a low soft packing formed in the annular groove and formed of an elastic body having a softness lower than that of the elastic packing. suggest.

  As a second embodiment of the present invention, the surface of the sealing member that is pressed against the opening surface of the sealed body and that contacts the sealed body of the sealing jig that seals the opening surface of the sealed body is formed on the periphery of the opening of the sealed body. According to the shape of the extended surface of the edge to be formed, an annular groove is formed in an annular shape, and an elastic packing that is attached to the annular groove and seals the opening portion of the sealed body. A seal packing comprising: a groove formed in a part of a surface in contact with the peripheral edge; and a low-soft packing formed in an elastic body having a softness lower than that of the elastic packing. suggest.

As a third embodiment of the present invention, in the sealing packing proposed in the second embodiment, grooves are provided at a plurality of locations in the ring of the elastic packing, and low soft packings are attached to each of the plurality of grooves. Proposed seal packing with structure.
As a fourth embodiment of the present invention, in the sealing packing proposed in the second embodiment or the third embodiment, the groove width of the concave groove formed in the elastic packing is the groove width on the side in contact with the body to be sealed. Accordingly, the groove on the sealing jig side is selected to have a large shape, and the bottom of the groove of the elastic packing that enters the groove is opened on the sealing jig side, and a low-soft packing having a convex cross section is formed from the opening. We propose a seal packing that is designed to be installed.

  In the fifth embodiment of the present invention, a sealed object having a first opening surface included in the first surface and a second opening surface included in a surface in a direction intersecting with the first surface is sealed. A sealing jig, a first jig that seals the first opening surface in contact with the edge of the first opening surface on the surface of the lower jig having a plane larger than the area of the first opening surface. Elastic packing, a second elastic packing that protrudes from a part of the first elastic packing along the second surface, and seals the second opening surface of the object to be sealed, and the first elasticity A groove formed between the first elastic packing and the second elastic packing at a bent portion where the packing and the second elastic packing are joined, and is inserted into the groove so as to contact a corner portion of the sealed object. The corner portion is sealed, and the softness is lower than the softness of the first elastic packing and the second elastic packing. Suggest sealing jig having a low soft packing formed of an elastic body with.

  According to the sealing packing according to the present invention, in addition to the conventionally used elastic packing, the groove formed in the elastic packing accommodates a low-soft packing formed of an elastic body having a softness lower than that of the elastic packing. Since it has a structure, the low-softness packing can be deformed by following the shape of the surface of the member to be sealed in the concavo-convex direction well like a fluid even with a small pressing force. As a result, even if there is a discontinuous portion such as a seam in the member to be sealed, it can be deformed following the shape of the discontinuous portion. As a result, a discontinuous portion such as a joint can be completely sealed with a low soft packing even in a drive device having a thrust smaller than that of a hydraulic cylinder such as an air cylinder.

In addition, a low-soft packing is placed opposite the seam, and the low-soft packing is pressed against the discontinuous part of the extended surface that occurs at the seam. It can be deformed and a nearly perfect seal can be obtained. As a result, an air cylinder is sufficient for the thrust of the sealing device, and the structure of the sealing device can be simplified.
Furthermore, since the low soft packing is housed in the groove of the elastic packing, air pressure for leak inspection is not directly applied to the low soft packing. As a result, the shape of the packing is not deformed by the air pressure sealed in the sealed object during the leak inspection. That is, there is no adverse effect caused by using the low soft packing. The hardness of the low-softness packing used here is about 1 to 12 degrees in terms of JISA hardness, but may be higher if the state of the seal surface of the object to be inspected is good.

  The sealing packing according to the present invention is best applied to a case where a discontinuous portion such as a joint between the object to be sealed and the sealing jig is generated on the surface of the sealing portion. In other words, the low-soft packing held by the elastic packing is pressed against the discontinuous part formed on the surface of the seal part, and the low-soft packing is deformed by sufficiently following the unevenness of the discontinuous part. Get a seal.

FIG. 1 shows an embodiment in which the sealing packing proposed in claim 1 of the present invention is applied to the sealing jig 4 described in FIGS. On the surface of the sealing jig 4, a groove 4 </ b> A is formed that matches the shape of the extended surface of the sealing surface formed by each end face of the sealed object 1 </ b> A to be subjected to the leakage inspection shown in FIG. (FIG. 1A).
The elastic packing 11 shown in FIG. 1B is inserted into the concave groove 4A. The elastic packing 11 is formed in an annular shape with an elastic body having a relatively high softness, for example, 50 degrees or more, such as urethane resin. A groove 11 </ b> C is formed on the surface of the elastic packing 11 that contacts the sealed body 1 </ b> A and each end surface of the sealing jig 2. By forming the groove 11C, banks 11A and 11B are formed on both sides of the groove 11C, and the low soft packing 12 shown in FIG. 1C is supported by the banks 11A and 11B. The low soft packing 12 can be composed of, for example, urethane gel or polyethylene gel. In short, the softness may be selected as a low softness of about 1 to 12 degrees in terms of JISA hardness.

FIG. 2 shows a completed state of the sealing jig 4. The elastic packing 11 is fitted into the concave groove 4A of the sealing jig 4, and the low soft packing 12 is inserted into the groove 11C of the elastic packing 11, or the low soft packing 12 is fitted into the groove 11C of the elastic packing 11 in advance. The elastic packing 11 into which 12 is fitted may be fitted into the concave groove 4A of the sealing jig 4.
The low soft packing 12 may be supported in a state of being slightly protruded outward from the banks 11A and 11B of the elastic packing 12 while being fitted in the groove 11C of the elastic packing 11. In this way, by causing the low soft packing 12 to protrude outward from the banks 11A and 11B of the elastic packing 11, the low soft packing 12 can be greatly deformed. As a result, the low soft packing 12 can be faithfully deformed with respect to the unevenness of the seal surface. Examples thereof are shown in FIGS. Even when a thin groove is formed at the joint between the sealed body 1A and the lower jig 2 as shown in FIG. 3 or when a step is generated as shown in FIG. The low soft packing 12 penetrates and a sufficient sealing effect can be obtained. In this sealed state, the low soft packing 12 is sandwiched between the banks 11A and 11B of the elastic packing 11, and the air pressure sealed inside the sealed body 1A is not directly applied to the low soft packing 12. As a result, even if the softness of the low-softness packing 12 is low and the deformation is free, the low-softness packing 12 is not deformed by the air pressure sealed in the sealed body 1A, and there is no possibility of inconvenience for the leakage inspection.

FIG. 5 shows an embodiment of the seal packing proposed in claims 2 to 4 of the present invention. In this embodiment, a plurality of grooves 11C are formed discontinuously in the annular portion of the elastic packing 11, and the low soft packing 12 is inserted and supported in each of the plurality of grooves 11C. The formation position of the groove 11C corresponds to the position where the discontinuous portion of the sealed body 1A occurs.
Here, as shown in FIG. 5B, the groove 11C has a narrow groove 11C-1 on the side contacting the sealing surface of the sealed body 1A, and the wide groove 11C on the side facing the bottom surface of the groove of the sealing jig 4. -2. Accordingly, the low-soft packing has a convex shape including a narrow ridge portion 12A and a wide ridge portion 12B, and is configured to be inserted and supported from the back side of the elastic packing 11.

By adopting this structure, there is an advantage that it is possible to prevent an accident that the low-soft packing 12 can come out from the groove 11C of the elastic packing 11.
That is, since the low soft packing 12 has a low softness, it has a property of sticking to a contact partner, and there is a possibility that an accident may occur in which the low soft packing 12 is detached from the groove 11C of the elastic packing 11 due to the adhesive force. However, according to this embodiment, the occurrence of such an accident can be suppressed.

FIG. 6 shows an embodiment of the seal packing proposed in claim 5 of the present invention. In this embodiment, a structure of a sealing jig for sealing the two opening surfaces of the sealed object 1A only by the lower jig 2 is proposed. Here, one opening surface of the sealed body 1A is referred to as a first opening surface X, and the other opening surface Y is referred to. In this embodiment, the first opening surface X and the second opening surface Y intersect with each other in a direction orthogonal to each other.
A first elastic packing 11-1 is attached to the surface of the lower jig 2. The first elastic packing 11-1 is attached to the lower jig 2 in the same manner as in the above-described embodiment. A concave groove is formed in the plane of the lower jig 2, and the first elastic packing 11- is formed in the concave groove. Wear 1 The first elastic packing 11-1 is formed of a relatively hard resin material such as urethane having a softness of 50 ° or more. The second elastic packing 11-2 is formed by protruding from a part of the first elastic packing 11-1. The protruding position of the second elastic packing 11-2 is selected as a position facing the position of the second opening surface Y of the sealed body 1A. The protruding shape of the second elastic packing 11-2 is made to coincide with the opening shape of the second opening surface Y of the sealed body 1A. Thereby, the periphery of the 2nd opening surface Y is made to contact the protrusion end surface of the 2nd elastic packing 11-2, and the 2nd opening surface Y is sealed.

  Here, a groove is formed across the first elastic packing 11-1 and the second elastic packing 11-2 in the bent portion where the first elastic packing 11-1 and the second elastic packing 11-2 are joined. Then, the low-soft packing 12 is mounted in this groove. The groove formed across the first elastic packing 11-1 and the second elastic packing 11-2 is bent according to the shapes of the first elastic packing 11-1 and the second elastic packing 11-2. . Therefore, the low soft packing to be mounted in the bent groove is also formed in a bent shape in advance, and the bent low soft packing 12 is inserted into the groove, and the low soft packing 12 is inserted into the first elastic packing 11-. 1 and the second elastic packing 11-2 are supported by the bent portions.

Thus, by arranging the low-softness packing 12 in the bent portion, the corner portion P (FIG. 6B) of the sealed body 1A can be sealed.
Accordingly, since the corner portion P can be sealed, according to this embodiment, the sealed body 1A can be sealed only by the lower jig 2. Although not shown in FIG. 6, a projecting piece is projected from the lower jig 2 along the outer surface of the second elastic packing 11-2, and the second elastic packing 11-2 is sealed. It can be set as the structure which prevents the accident which protrudes from the 2nd opening surface Y of 1A.

  Although the above-described seal packing and seal jig according to the present invention have been described as being used for leak inspection, the seal packing and seal jig according to the present invention are not limited to use for leak inspection, and For example, it can be used for a pressure test or an internal volume inspection.

The exploded front view for demonstrating 1st Example of this invention. Sectional drawing for demonstrating the structure of the sealing jig comprised incorporating the elastic packing and the low soft packing in the sealing jig shown in FIG. The expanded sectional view for demonstrating the practical condition of the sealing jig | tool shown in FIG. The expanded sectional view similar to FIG. A for explaining a second embodiment of the present invention is a front view of a seal packing, B is a plan view partially showing a cross section, and C is a cross sectional view of a sealing jig. For explaining the third embodiment of the present invention, A is a plan view of a lower jig, B is a front view of an object to be sealed, and C is a front view of the lower jig. The perspective view for demonstrating the structure of a to-be-sealed body. The perspective view for demonstrating a prior art. The perspective view similar to FIG. The perspective view similar to FIG. Sectional drawing for demonstrating the structure of the sealing jig | tool shown in FIG. The expanded sectional view for demonstrating the fault of a prior art. The expanded sectional view similar to FIG. The front view for demonstrating the disadvantage of a prior art.

Explanation of symbols

1A To-be-sealed body 11-1 1st elastic packing
2 Lower jig 11-2 Second elastic packing
4 Sealing jig 12 Low soft packing
4A Concave groove X First opening surface
11 Elastic packing Y 2nd opening surface 11A, 11B Bank 11C Groove

Claims (2)

The shape of the extended surface of the edge formed on the peripheral edge of the opening of the sealed body on the surface of the sealing jig that is pressed against the opening surface of the sealed body and seals the opening surface of the sealed body In the elastic packing for forming an annular groove in accordance with the annular groove, and sealing the opening of the sealed body by being attached to the annular groove,
A groove formed on a part of the surface of the elastic packing that contacts the periphery of the opening of the sealed body;
Mounted within the groove, and a soft property packing formed of an elastic material having a lower hardness degree than the elastic packing,
The groove width of the groove formed in the elastic packing is selected so that the groove on the sealing jig side is larger than the groove width on the side in contact with the object to be sealed, and the bottom of the groove of the elastic packing entering the concave groove is sealed. It is open on the tool side, and has a structure in which a soft packing with a convex cross section is attached from this opening part.
A seal packing characterized by that. The seal packing according to claim 1, wherein the groove is provided at a plurality of locations in an annular shape of the elastic packing, and the flexible packing is attached to each of the plurality of grooves.
A seal packing characterized by that.

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