JP3252066B2 - Expanded graphite packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a Rise Zhang graphite packings expanded graphite material ing and pressed into a predetermined shape such as a ring-shaped
It relates to emissions.

[0002]

BACKGROUND OF THE INVENTION Generally, a product has a predetermined display (such as a manufacturer's name, product number, size, material, etc.) for distinguishing the product from similar / similar products, and the like. Etc.) are often applied by printing, etc., but packing is different from general products because the number of operators and users is limited. There is no indication on the packing itself, as there is no particular disadvantage or inconvenience.

However, in reality, since such display is not performed, various problems occur in use or handling in many cases. For example, when a plurality of packings having slightly different diameters are used at the same time, apart from those diameter differences being clearly distinguished, otherwise,
Even a moderately skilled person may make a mistake in selecting an appropriate packing . Alternatively , when the packing has a distinction between the front and back (for example, when there is a distinction between the front and back due to a density difference or the like), it is often difficult to visually determine the difference, and the packing is incorrectly attached to the sealed portion. There is a possibility that it will happen.

The inventor of the present invention has proposed a package made of expanded graphite in order to eliminate the disadvantages and inconveniences in use and handling as described above.
An attempt was made to provide an appropriate indication on the kin with a paint such as ink, but it was found that such an attempt was not practical. That is, in the case of the expanded graphite packing , since the expanded graphite is a non-adhesive substance, the coating does not sufficiently adhere to the packing surface depending on a general coating material such as ink, and the display is substantially provided. I can't get it. On the other hand, when a paint containing a large amount of pressure-sensitive adhesive is used to enhance the adhesiveness to the packing surface, the heat resistance and corrosion resistance of the packing are reduced, or the pressure-sensitive adhesive is eluted depending on the use conditions of the packing. There is a possibility that such a display with the paint is not preferable in terms of the sealing function and performance.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and eliminates disadvantages and inconveniences in handling and use without any adverse effect on the sealing function and performance. It is an object of the present invention to provide a packing made of expanded graphite.

[0006]

The packing made of expanded graphite of the present invention which has solved the above-mentioned problems is obtained by pressing an expanded graphite material into a predetermined shape. The indication of the packing consisting of, figures or symbols or a combination of these can be visually discriminated.
And when the packing is pressed during use
They are integrally formed in a state where they protrude slightly to the extent that they disappear . Viewing content can be selected handling and Usage disadvantages, what needed to eliminate the inconvenience accordingly. Generally, a manufacturer name, a product number, dimensions, and the like are displayed according to a sealing function, performance, and the like.

[0007]

[Function] By providing such a mark on at least a part of the surface of the packing , it is possible to easily confirm dimensions, the distinction between front and back, and the like, which are difficult to determine by visual inspection, and are disadvantageous in handling and use. Inconvenience can be completely eliminated.

[0008] When the displayed surface portion is a portion directly related to the sealing function, that is, when the surface portion is a sealing surface pressed by a flange or the like, the indication is that the sealing surface is a sealing surface. Together with the fact that the packing is made of expanded graphite that is highly deformable, the gasket disappears due to pinching by a flange or the like. That is, the surface form of the packing at the time of use is exactly the same as a normal packing which does not bulge the display. In addition, the indication is not given by a paint or the like different from the packing , but is of the same quality as the packing formed integrally with the packing . Therefore, by providing a display made of characters or the like on the packing, there is no adverse effect on the sealing function and performance. In addition, if the surface portion on which the indication is given is a part which does not affect the sealing function at all, regardless of whether the indication disappears during use, there is no adverse effect on the sealing function and performance. Of course not.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be specifically described below with reference to the embodiments shown in FIGS.

[0010] expanded graphite packing 1 of this embodiment, as shown in FIGS. 1 to 3, the expanded graphite material 1 'are those formed by pressure-molding the annular end face 2a is a portion of a surface thereof 2 In addition, the display 3 relating to the packing 1 composed of characters, symbols, figures, or a combination thereof is integrally formed in a slightly protruding state.

That is, the surface 2 of the packing 1 includes both end surfaces 2a and 2b in the axial direction and inner and outer peripheral surfaces 2c and 2d functioning as sealing surfaces. In this embodiment, the display 3 is provided on one end surface 2a. It is formed. The content of the display 3 is arbitrary as long as it relates to the packing 1 and, in general, what is necessary for eliminating disadvantages and inconveniences in handling and use is appropriately determined according to the packing performance and the like. I just need. Specifically, it is a manufacturer name, a product number, dimensions, a material, and the like. FIG. 1 shows a packing 1 as an example of the display 3.
Inner and outer diameter dimensions “φ32 × φ48” and the manufacturer name “P
ILLAR "is shown. By the way, the display 3 is formed to bulge on the front surface 2, and the bulge amount is very small enough to visually determine the display content.

The packing 1 of this embodiment is shown in FIG.
As shown in FIG. 3 and FIG. 3, a ring-shaped expanded graphite material 1 ′ having a shape close to a packing shape is obtained by press-molding with a mold 4. As shown in FIG. 2, the expanded graphite material 1 'is formed by spirally winding an expanded graphite tape 1a into an annular shape (FIG. 2A) or by laminating an annular plate 1b obtained by punching an expanded graphite sheet ( FIG. (B)) is used. As shown in FIG. 3, the mold 4 has a disc-shaped bottom mold 5, a cylindrical core mold 6 erected at the center of the bottom mold 5, and a core mold at the periphery of the bottom mold 5. A cylindrical outer mold 7 erected concentrically with the cylindrical mold 6 and a cylindrical mold 9 slidably inserted into a cylindrical molding space 9 formed between opposing surfaces of the core mold 6 and the outer mold 7. And a press die 8 having a shape of a circle. An annular fixed molding surface 5a, which is desired in the molding space 9 on the upper surface of the bottom die 5, has a mirror-shaped molding groove 5 corresponding to the display 3 described above.
b is engraved. The movable molding surface 8a, which is the lower end surface of the pressing die 8, is a flat surface having no molding groove.

That is, the expanded graphite material 1 ′ is placed in the molding space 9.
After being loaded between the two molding surfaces 5a and 8a in FIG.
(A)) When the pressing die 8 is pressed down, the expanded graphite material 1 ′ is formed into an annular pressure, and the packing 1 having a desired shape is obtained. At this time, due to the forming groove 5b formed in the fixed forming surface 5a, the display 3 corresponding to the forming groove 5b is simultaneously formed on the lower surface of the packing 1, that is, the end surface 2a.

In the packing 1 configured as described above, the indication 3 such as the packing size is formed on the end face 2a. It can be confirmed, and disadvantages and inconvenience in handling and use can be completely eliminated. If there is a distinction between the front and back sides of the end faces 2a and 2b, the indication 3 is applied to only one end face 2a as described above, without specially indicating the distinction. , 2b can be easily determined.

Moreover, since the display 3 disappears when the packing 1 is used, the display 3 has no adverse effect on the sealing function. For example, as shown in FIG. 4, the packing 1 is loaded into the packing box 12 of the valve box 11 in a state of being inserted through the valve rod 10 ((A) in FIG.
3 with bolts and nuts 14.
Outer peripheral surface 10a and inner peripheral surface 12a of packing box 12
And between the bottom face 12b of the packing box 12 and the lower end face 13a of the packing retainer 13 to seal the gap between the valve stem 10 and the valve box 11 (FIG. 1B). ). In such a use state of the packing 1, the display 3 has the packing presser 13 because the packing 3 is only slightly projecting from the end face 2 a and the constituent material of the packing 1 is expanded graphite which is highly deformable. The packing box 12
Is completely removed by being pinched between the bottom surface 12b of the gasket and the lower end surface 13a of the packing presser 13 (see FIG. 8B). That is, the surface form of the packing 1 during use is exactly the same as that of a normal packing that does not bulge the display 3. In addition, the display 3 is not provided with a paint or the like different from the packing 1,
It is of the same quality as the packing component formed integrally with the packing material.
Therefore, by giving the indication 3 to the end face 2a of the packing 1, there is no adverse effect on the function and performance of the packing 1.

[0016] The present invention is not limited to the above embodiments, appropriately modified without departing from the basic principles of the present invention, it is possible to improve, manufactured by each species expanded graphite
It is possible to apply to packing .

The location where the display 3 is bulged is arbitrary, and may be any location directly involved in the sealing function (for example, the end face in the axial direction when an annular packing is pressed between flanges in the axial direction). ) Or a portion that is not directly involved in the sealing function (for example, the inner and outer peripheral surfaces in the case of being pressed between the flanges as described above). Of course, if the display 3 is bulged at a location not directly related to the sealing function, the display 3 may not disappear when the packing is used, but even in such a case,
Since the display location is a location that is not directly involved in the sealing function, there is no adverse effect on the sealing function due to the remaining display 3. When the display 3 is formed on the inner peripheral surface 2c,
Since the inner peripheral surface 2c is in contact with the fluid and participates in the sealing function, and the display 3 does not disappear when the packing is used, since the display 3 is of the same quality as the packing constituent material, Has no adverse effect on the sealing function and performance.

[0018]

As will be readily understood from the above description, expanded graphite packing of the present invention, the path on its surface
Since the display relating to the packing is integrally formed, by visually observing the display, it is possible to easily and accurately determine the dimensions and the like required for handling and using the packing . Moreover, since the display is of the same quality as the constituent material of the packing , the seal function and performance are not adversely affected unlike the case where the display is made of a different ink or the like. Further, since the display disappears when the packing is used even when the display is bulged at a part directly related to the sealing function, the display function is reduced to the sealing function and performance. There is no adverse effect of. Of course, if the display is bulged at a location not directly related to the sealing function, there is no adverse effect on the sealing function and performance, regardless of whether or not it disappears during use.

Therefore, according to the present invention, it is possible to provide an expanded graphite packing which can eliminate disadvantages and inconveniences in handling and use without any adverse effect on the sealing function and performance.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an expanded graphite packing according to the present invention.

FIG. 2 is a perspective view showing an expanded graphite material.

FIG. 3 is a cross-sectional view showing a step of forming the packing .

FIG. 4 is a cross-sectional view showing a usage state of the packing .

[Explanation of symbols]

1 ... expanded graphite packings, 1'... expanded graphite material, (a portion of the display is formed surface) 2 ... surface, 2a ... end surface, 3
... display, 4 ... mold.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-188686 (JP, A) JP-A-6-101763 (JP, A) JP-A-54-86048 (JP, A) 158625 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16J 15/00-15/14

Claims (1)

(57) [Claims] 1. A packing made of expanded graphite obtained by press-molding an expanded graphite material into a predetermined shape, and at least a part of the surface thereof is visually discriminated by a display relating to the packing made of characters, figures, symbols, or a combination thereof.
And the pressure of the packing during use
An expanded graphite packing, which is integrally formed in such a manner as to be slightly protruded to the extent that the packing disappears .