JPH10132086A - Packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the usability and the general purpose property of a packing while to secure a high sealing property as a packing, by increasing the tensile strength and the toughness of knitting yarns while maintaining the intrinsic high compression restoring property and the concordance of an expansion graphite. SOLUTION: In this packing 1 with a free length, plural lines of reinforced yarns 40 set in an expansion graphite 41 to be a base material along its longitudinal direction is jointed with the expansion graphite 41 integral, or they are buried without jointing so as to compose a knitting yarn 4. Plural lines of knitting yarns 4 are bundled to form a core 2, and the outer periphery of the core 2 is covered by a braid 3 of knitting yarns 4, or plural lines of knitting yarns 4 are bundled to form a braid, or plural lines of knitting yarns 4 are bundled and twisting processed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing suitable for a gland packing used for a shaft sealing portion of a fluid device.

[0002]

2. Description of the Related Art Conventionally, as a packing material for obtaining a gland packing used for, for example, a shaft sealing portion of a fluid device, an expanded graphite having a high compression restoring property and an excellent sealing property is used as a base material. It has been known.

[0003]

The gland packing formed on the basis of such expanded graphite is as follows.
It is manufactured by a compression molding method such as a lamination type, a die molding type, a chip molding type, a ribbon pack type, etc., but these must be formed in a ring shape according to the shaft diameter to be used in advance. It cannot be used for other things. Therefore, versatility is poor,
In addition, since the expanded graphite itself has a weak tensile strength and is brittle, it is difficult to take out the one attached to a staffin box or the like for replacement, resulting in poor usability.

Further, as a problem of each of the above-mentioned compression molding methods, in the case of the laminate type, the yield is poor and the cost is increased. In the case of the die molding method and the chip molding method, the cost is increased as compared with the die molding, and the versatility is poor. In the case of the ribbon pack type, workability is poor.

[0005] These problems can be solved by forming the expanded graphite into a string so that it can be used by cutting it to a predetermined length in accordance with the shaft diameter, like other braided packings. The expanded graphite itself is a caterpillar-like particle (powder) in appearance, which is expanded in the C-axis direction of the crystal of the graphite particle. Therefore, these caterpillar-like particles can be aggregated and formed into a sheet by compression molding. Even if it is formed as described above, since it has a low tensile strength and is brittle as described above, it cannot be braided because it cannot be formed into a yarn. Therefore, it has been considered impossible to cut the wire into a predetermined length in accordance with the shaft diameter like other braided packings, wind the cut wire around the shaft outer periphery, and use it as a packing.

The present invention has been made in view of the above circumstances, and has been made as a result of an intensive study based on an expanded graphite knitting yarn necessary for braiding, that is, a knitting yarn structure based on expanded graphite. The tensile strength and toughness of the knitting yarn are increased without compromising the characteristics of expanded graphite, which has high compression restorability and excellent conformability. It is an object of the present invention to provide a packing capable of improving usability and versatility while securing the packing.

[0007]

In order to achieve the above object, a packing according to the present invention is arranged in an expanded graphite as a base material along a longitudinal direction thereof. The reinforcing fiber yarn is embedded to form a knitting yarn, a plurality of the knitting yarns are bundled to form a core, and the outer periphery of the core is covered with a braided body of the knitting yarn, or The method is characterized in that a plurality of the knitting yarns are bundled and braided, or a plurality of the knitting yarns are bundled and twisted.

[0008] According to the present invention, the reinforcing fiber yarn is arranged and buried along the longitudinal direction of the knitting yarn based on the brittle expanded graphite. By making use of the bonding properties between the expanded graphites, a predetermined amount of expanded graphite aggregates are formed, and the reinforcing fibers are added to the knitting yarn while maintaining the high compression restorability and excellent conformability inherent to the expanded graphite. Since the yarn has high tensile strength and toughness, the knitting yarn can be braided or twisted without breaking the yarn. As a result, a string-shaped body in which the outer periphery of the core formed by bundling a plurality of the knitting yarns is covered with a braided body of the knitting yarns is formed, or a plurality of the knitting yarns are bundled and braided to increase the height. To form a braided body (square knitting) having tensile strength and toughness, or to form a twisted string having high tensile strength and toughness by bundling a plurality of knitting yarns and twisting. Therefore, the high tensile strength of the knitting yarn constituting the packing can be secured while ensuring the high sealing properties indispensable as the packing due to the high compression restoring property and conformability which are the inherent properties of the expanded graphite. By utilizing the toughness and the toughness, the versatility and usability can be improved, such as cutting the cord-shaped body to a predetermined length in accordance with the shaft diameter, winding around the shaft outer periphery, and using it as a packing.

In the packing according to the present invention, the reinforcing fiber yarn arranged along the longitudinal direction of the expanded graphite as a base material is integrated with the expanded graphite by an adhesive. A knitting yarn is formed by adhering and embedding to a knitting yarn, a plurality of the knitting yarns are bundled to form a core, and the outer periphery of the core is covered with a braided body of the knitting yarn, or It is characterized in that it is bundled and braided, or a plurality of the knitting yarns are bundled and twisted.

[0010] According to the inventions of the above constructions, similar to the inventions of the first to third aspects, high compression restorability and conformability, which are inherent properties of expanded graphite, are provided. While ensuring the high sealing properties essential for packing, the high tensile strength and toughness of the knitting yarn that composes this packing is used to make the string into a predetermined length according to the shaft diameter. Of course, it is possible to improve the versatility and usability such as cutting and winding around the shaft outer periphery and using it as a packing, and in particular, the reinforcing fiber yarn constituting the knitting yarn and the expanded graphite are integrally bonded by an adhesive. Therefore, even if stress such as bending or twisting is applied during the manufacturing process of packing such as braid, it is possible to prevent the exfoliated graphite from peeling or falling off, and to achieve high sealing performance due to the inherent characteristics of expanded graphite. It can be a layer reliably exhibit.

As the expanded graphite in the packing according to the first to sixth aspects of the present invention, the caterpillar-like graphite powder according to the seventh aspect may be used, or the narrow width as described in the eighth aspect may be used. A sheet-like material may be used.

Further, as the reinforcing fiber yarn constituting the knitting yarn in the packing according to the first to sixth aspects of the present invention, as described in the ninth aspect, cotton, rayon, phenol, aramid, PBI , PTEF, PPS, PEEK
Even at least one selected from organic fibers such as glass fibers, carbon fibers, and ceramic fibers as described in claim 10, at least one selected from inorganic fibers such as glass fibers, carbon fibers, and ceramic fibers. Claim 1
As described in claim 1, it may be at least one selected from metal wires such as stainless steel, inconel, and monel, and as described in claim 12, selected from the organic fibers. A composite of at least one and at least one selected from the above inorganic fibers or metal wires may be used.

[0013] Further, as the reinforcing fiber yarn in the knitting yarn for packing according to the first to sixth aspects of the present invention, at least one selected from the inorganic fibers or the metal wires as described in the thirteenth aspect. Or the surface of one of these composites coated with one short fiber selected from the organic fibers or a composite short fiber yarn thereof, as described in claim 14, the inorganic fiber or metal wire. Wherein the surface of one or a composite thereof selected from the following is coated with a papermaking product, wherein the organic fiber and the inorganic fiber or metal wire are twisted as described in claim 15, A knitted knitting of the organic fiber or the inorganic fiber or the metal wire as described in claim 16, or a plurality of non-woven fibers extending parallel to the longitudinal direction as described in claim 17. A fiber or metal wire, is entangled between them made of an organic fiber that retains parallel, may be any of.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing an embodiment of the packing according to the present invention. In FIG. 1, a packing 1 is, for example, a bag-knit covering a core 2 and an outer periphery of the core 2. The core 2 is formed by bundling a plurality of knitting yarns 4 and arranging them in the longitudinal direction. The braided body 3 is formed by bag-knitting the knitting yarns 4.

As shown in FIG. 2, both sides of a plurality of reinforcing fiber yarns 40 made of, for example, cotton, which are arranged along the longitudinal direction at intervals in the width direction, are not shown in FIG. It is configured to be integrally bonded and buried with the expanded graphite 41 made of caterpillar-like expanded graphite powder with an adhesive. The cotton used as the reinforcing fiber yarn 40 has so-called fluffing, in which an extremely short number of extremely thin fibers stand on its surface, so that it has good adhesion to the adhesive. For this reason, the reinforcing fiber yarn 40 and the expanded graphite 41 are firmly bonded to each other, so that it is possible to prevent the expanded graphite 41 from peeling off or falling off during a packing manufacturing process such as braiding.

As described above, the knitting yarn 4 in which a plurality of reinforcing fiber yarns 40 made of, for example, cotton, which are arranged in the longitudinal direction at intervals in the width direction, are integrally adhered to the expanded graphite 41 with an adhesive and embedded. Since the high tensile strength and toughness of the reinforcing fiber yarn 40 are imparted to the knitting yarn 4, the knitting yarn 4 can be braided without breaking. Therefore, a string-shaped body 5 in which the outer periphery of the core formed by the knitting yarn 4 is covered with the braided body 3 sack-knitted with the knitting yarn 4, that is, a string having a high tensile strength and rich in toughness Since the string 5 can be formed into a shape 5 and cut into a predetermined length in accordance with, for example, the shaft diameter and used as the packing 1, versatility and usability are improved. In addition, the core 2 and the braided body 3 constituting the packing 1 are provided with the high compression restoring property and the excellent conformability inherent to the expanded graphite 41, so that the packing 1 is indispensable for the packing 1. Sealing characteristics can be secured.

FIG. 3 is a perspective view showing another embodiment of the packing 1 according to the present invention. The same or corresponding parts as those of the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. . In FIG. 3, a packing 1 is a string-shaped body 5 formed by a braided body 3 </ b> A formed by eight-pitch knitting using eight knitting yarns 4.
Is formed.

Also in the case of this embodiment, since the high tensile strength and toughness of the reinforcing fiber yarn 40 are imparted to the knitting yarn 4, the knitting yarn 4 is braided without breaking. Square knitting) Therefore, the braided body 3A having high tensile strength and rich toughness
Thus, the string-shaped body 5 can be formed, and the string-shaped body 5 can be cut into a predetermined length in accordance with, for example, the shaft diameter and used as the packing 1, so that versatility and usability are improved. In addition, the braided body 3A constituting the packing 1 is provided with the high compression restoring property and the excellent conformability inherent to the expanded graphite 41, so that the high sealing properties essential for the packing 1 are provided. Can be secured.

FIG. 4 is a perspective view showing another embodiment of the packing according to the present invention, in which the same or corresponding parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIG. 4, the packing 1 has a knitting yarn 4 of 6
The bundle is bundled and roll-formed while being twisted at a rate of 20 times / m to form a twisted string-like body 5.

Also in this embodiment, since the high tensile strength and toughness of the reinforcing fiber yarn 40 are imparted to the knitting yarn 4, the knitting yarn 4 is twisted without breaking the yarn. can do. Therefore,
A twisted string 5 having high tensile strength and rich toughness is formed, and this string 5 is cut into a predetermined length according to, for example, the shaft diameter and used as the packing 1. Therefore, versatility and usability are improved.
In addition, the twisted string-like body 5 constituting the packing 1 is provided with the high compression restoring property and the excellent conformability inherent to the expanded graphite 41.
High sealing characteristics, which are indispensable as the packing 1, can be secured.

In each of the above-described embodiments, a description has been given of a case where a caterpillar-like graphite powder is used as the expanded graphite 41. However, a sheet-shaped expanded graphite cut into a narrow width (width, for example, 5 mm or less) is used. May be used. In addition, the reinforcing fiber yarn 4
The knitting yarn 4 in which only one side of the No. 0 is bonded to the expanded graphite 41 with an adhesive may be constituted. Furthermore, the above-mentioned knitting yarn 4
May be used after twisting as shown in FIG.

The reinforcing fiber yarn 4 constituting the knitting yarn 4
0 is one selected from organic fibers such as rayon, phenol, aramid, PBI, PTFE, PPS, and PEEK, or inorganic fibers such as glass fibers, carbon fibers, and ceramic fibers, in place of the cotton. Or one selected from metal wires such as stainless steel, inconel, and monel, and at least one selected from the organic fibers and the inorganic fiber. It may be a composite with at least one selected from fibers.

FIGS. 6 to 10 each show a modification of the reinforcing fiber yarn 40. The reinforcing fiber yarn 40 shown in FIG. 6 includes one of the organic fibers 40A (cotton or aramid);
One selected from the inorganic fibers or metal wires 40
B (glass fiber, carbon fiber or stainless wire). In the reinforcing fiber yarn 40, the adhesion and the toughness with the expanded graphite 41 are improved by the organic fiber,
In addition, tensile strength and toughness can be improved by inorganic fibers or metal wires.

The reinforcing fiber yarn 40 shown in FIG. 7 is formed of at least one of the inorganic fibers or metal wires 40B.
The surface of (glass fiber, carbon fiber, or stainless steel wire) is covered with one (cotton or aramid) short fiber 6 selected from organic fibers. In the reinforcing fiber yarn 40, the adhesion layer and the toughness with the expanded graphite 41 are improved by the coating layer of the short fibers 6, and the tensile strength and the toughness are improved by at least one 4OB selected from inorganic fibers or metal wires. Can be done. The coating layer of the short fibers 6 may be formed by a composite short fiber yarn in which two or more short fibers selected from organic fibers are composited.

The reinforcing fiber yarn 40 shown in FIG. 8 is formed of at least one of the inorganic fibers or metal wires 40B.
The surface of (glass fiber, carbon fiber or stainless steel wire) is coated with, for example, a pulp papermaking product 7. In the reinforcing fiber yarn 40, the coating layer of the pulp papermaking 7 improves the adhesion and toughness with the expanded graphite 41, and the tensile strength and toughness are improved by at least one 40B selected from inorganic fibers or metal wires. Can be improved.

The reinforcing fiber yarn 40 shown in FIG. 9 is one of the organic fibers 40A (cotton or aramid) or the inorganic fiber, or one of the metal wires 40B (glass fiber, carbon fiber). Or stainless steel wire). In the reinforcing fiber yarn 40, the adhesiveness with the adhesive is improved by the unevenness formed by the stitches of the knitted knitted structure, and the tensile force can be absorbed by the stretching function possessed by the knitted knitted structure itself. As a result, the tolerance for tension is increased, and the toughness is improved.

In the reinforcing fiber yarn 40 shown in FIG. 10, a plurality of fibers 40B (glass fiber, carbon fiber or stainless steel wire) selected from the above-mentioned inorganic fibers or metal wires are arranged in parallel in the longitudinal direction. 40A (cotton or aramid) selected from the organic fibers is entangled between a plurality of fibers to maintain parallelism. In the reinforcing fiber yarn 40, the adhesion and the toughness with the expanded graphite 41 can be improved by the organic fiber, and the tensile strength and the toughness can be improved by the inorganic fiber or the metal wire.

As described above, the knitting yarn 4 is provided with high tensile strength and toughness of the reinforcing fiber yarn 40 laid and buried in the expanded graphite 41 along the longitudinal direction at intervals in the width direction thereof. The knitting yarn 4 can be easily braided or twisted without breaking the yarn. That is, as shown in FIGS. 11A and 11B, the knitting yarn bobbin is drawn out from the plurality of knitting yarn bobbins 9 and 9 that are swiveled on the locus indicated by the broken line to form the knitting yarn. 9,
The length 1a from the yarn bobbins 9 and 9 to the knitting point P when the yarn 9 is positioned outside the locus, and the yarn when the yarn bobbins 9 and 9 are positioned inside the locus. The difference between bobbin 9, 9 and length 1b from knitting point P is small,
Therefore, not only the case where a relatively small tensile force is applied to the knitting yarn 4 but also, as shown in FIGS.
When the yarn bobbins 9, 9 are positioned outside the locus, as in the case where the yarn 4 is unwound from a plurality of yarn bobbins 9, 9 that move along a diagonal locus indicated by a broken line and are square-knitted. Length from yarn bobbins 9, 9 to knitting point P
a and the length 1 from the yarn bobbins 9, 9 to the knitting point P when the yarn bobbins 9, 9 are located at the center of the locus.
Therefore, the braiding is possible even when a relatively large tensile force is applied to the knitting yarn 4.

[0029]

As described above, according to the first to third aspects of the present invention, the reinforcing fiber yarn is arranged along the longitudinal direction in the knitting yarn based on the brittle expanded graphite. By embedding and embedding, a predetermined amount of aggregate of expanded graphite is formed using the bonding property of expanded graphite, and while maintaining the high compression recovery property inherent in expanded graphite and excellent conformability, the knitting yarn By imparting the high tensile strength and toughness of the reinforcing fiber yarn, it is possible to reliably prevent the occurrence of yarn breakage or the like during the manufacturing process of the packing in which complicated stress acts such as braiding or twisting. Therefore, a plurality of knitting yarns may be bundled to form a string-shaped body in which the outer periphery of the core is covered with a braided body of the knitting yarns, or a plurality of knitting yarns may be bundled and braided for high tensile strength. It is easy to form a braided body (square knitting) having strength and toughness, or to form a string having high tensile strength and toughness by bundling and twisting a plurality of knitting yarns. Yes, therefore, it is possible to secure the high sealing properties that are indispensable as a packing due to the high compression restoring property and conformability that are the inherent properties of expanded graphite, but at the same time, the high tensile strength and toughness of the knitting yarn constituting this packing Utilizing the above, there is an effect that the versatility and usability can be improved such that the cord-shaped body is cut into a predetermined length according to the shaft diameter, wound around the shaft outer periphery, and used as a packing.

Further, according to the invention described in claims 4 to 6, as in the invention described in claims 1 to 3, the packing can be used as a packing due to the high compression restoring property and conformability inherent to expanded graphite. In addition to securing the indispensable high sealing characteristics, it is possible to improve the versatility and usability such as cutting to a predetermined length according to the shaft diameter, winding around the shaft outer periphery and using it as a packing, and especially, knitting yarn The reinforcing fiber yarn and the expanded graphite are firmly bonded together by an adhesive, so that even if stress such as bending or twist is applied during the manufacturing process of packing such as braid, the expanded graphite may peel off. This has the effect of reliably preventing the falling off, and more reliably exhibiting the high sealing performance due to the inherent characteristics of the expanded graphite.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing one embodiment of a packing according to the present invention.

FIG. 2 is a partially cut perspective view showing an example of a knitting yarn constituting the packing.

FIG. 3 is a partially cutaway perspective view showing another embodiment of the packing according to the present invention.

FIG. 4 is a partially cut perspective view showing another embodiment of the packing according to the present invention.

FIG. 5 is a perspective view showing a modified example of a knitting yarn.

FIG. 6 is an explanatory view showing a modified example of the reinforcing fiber yarn.

FIG. 7 is an explanatory view showing a modified example of the reinforcing fiber yarn.

FIG. 8 is an explanatory view showing a modified example of the reinforcing fiber yarn.

FIG. 9 is an explanatory view showing a modified example of the reinforcing fiber yarn.

FIG. 10 is an explanatory view showing a modified example of the reinforcing fiber yarn.

FIG. 11A is a front view showing a state in which a knitting yarn fed from a knitting yarn bobbin to a knitting point is bag-knitted, and FIG.
FIG. 4 is a side view for explaining a change in length of a knitting yarn when bag-knitting a knitting yarn fed from a knitting bobbin to a knitting point.

FIG. 12A is a front view showing a state in which a knitting yarn fed from a yarn bobbin to a knitting point is square-knitted, and FIG.
FIG. 3 is a side view for explaining a change in length of a knitting yarn when a knitting yarn fed from a knitting yarn bobbin to a knitting point is squarely knitted.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 packing 2 core 3, 3A braided body 4 knitting thread 40 reinforcing fiber thread 41 expanded graphite

Claims (17)

[Claims] 1. A reinforcing fiber yarn arranged along the longitudinal direction of the expanded graphite serving as a base material is embedded into a knitting yarn, and a plurality of knitting yarns are bundled to form a core. A packing characterized in that the outer periphery of the core is covered with the braided body of the knitting yarn. 2. A method in which a reinforcing fiber yarn arranged along the longitudinal direction of the expanded graphite as a base material is buried to form a knitting yarn, and a plurality of the knitting yarns are bundled and braided. Packing to do. 3. A method in which a reinforcing fiber yarn arranged along the longitudinal direction of the expanded graphite as a base material is buried to form a knitting yarn, and a plurality of the knitting yarns are bundled and twisted. And packing. 4. A reinforcing fiber yarn arranged along the longitudinal direction of an expanded graphite as a base material is integrally bonded to the expanded graphite with an adhesive and embedded to form a knitting yarn. A packing, wherein a core is formed by the main bundle, and an outer periphery of the core is covered with a braided body of the knitting yarn. 5. A knitting yarn, wherein a reinforcing fiber yarn disposed along the longitudinal direction of the expanded graphite serving as a base material is integrally bonded to the expanded graphite with an adhesive and embedded to form a knitting yarn. Packing characterized by being bundled and braided. 6. A reinforcing fiber yarn arranged along the longitudinal direction of the expanded graphite as a base material is integrally bonded to the expanded graphite by an adhesive and embedded to form a knitting yarn. Packing characterized by the fact that it is bundled and twisted. 7. The packing according to claim 1, wherein the expanded graphite is a caterpillar-like graphite powder. 8. The packing according to claim 1, wherein the expanded graphite is in the form of a narrow sheet. 9. The reinforcing fiber yarn is made of cotton, rayon, phenol, aramid, PBI, PTEF, PPS, PEE.
The packing according to any one of claims 1 to 6, wherein the packing is at least one selected from organic fibers such as K. 10. The packing according to claim 1, wherein the reinforcing fiber yarn is at least one selected from inorganic fibers such as glass fibers, carbon fibers, and ceramic fibers. 11. The packing according to claim 1, wherein the reinforcing fiber yarn is at least one selected from a metal wire such as stainless steel, Inconel, and Monel. 12. The method according to claim 1, wherein the reinforcing fiber yarn is a composite of at least one selected from the organic fibers and at least one selected from the inorganic fibers or the metal wires. The packing described. 13. The reinforcing fiber yarn may be provided with a surface of at least one selected from the inorganic fibers or metal wires or a composite of these fibers, or a single short fiber selected from the organic fibers or a fiber thereof. The packing according to any one of claims 1 to 6, wherein the packing is covered with a composite short fiber yarn. 14. The reinforcing fiber yarn wherein one of the inorganic fibers or the metal wires or a composite of these is coated with a papermaking material.
7. The packing according to any one of items 6 to 6. 15. The packing according to claim 1, wherein the reinforcing fiber yarn is obtained by twisting the organic fiber and the inorganic fiber or the metal wire. 16. The packing according to claim 1, wherein the reinforcing fiber yarn is formed by knitting the organic fiber, the inorganic fiber, or the metal wire. 17. The method according to claim 1, wherein the reinforcing fiber yarn comprises a plurality of inorganic fibers or metal wires extending in parallel in the longitudinal direction, and organic fibers entangled therebetween to maintain the parallelism. Packing according to any of the above.