JP2013100903A - Gland packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration of sealing performance due to cracks unwillingly caused in the widthwise end of expansion graphite tape of knitting thread in a gland packing.SOLUTION: In a plurality of knitting threads in the gland packing, knitting threads 10A are provided in the knitting threads wherein the expansion graphite tape 30 of a predetermined width is bent to contract in a width direction, and reinforcement wire 41 is embedded in the interior of the bent expansion graphite tape 30 in the longitudinal direction of the expansion graphite tape 30.

Description

  The present invention relates to a gland packing used for a shaft seal portion of a fluid device.

  Conventionally, as a plurality of knitting yarns in a braided gland packing, for example, knitting yarns described in Japanese Patent Publication No. 6-27546 and JP-A-6-74346 are known. The knitting yarn is bent so that the expanded graphite tape is contracted in the width direction, and the entire outer periphery of the bent expanded graphite tape has a mesh without using an adhesive or a fusing material. It is covered only with a reinforcing material made of a body.

  By the way, expanded graphite tape is vulnerable to tension and torsion, so in the knitting yarn in the gland packing, unintentionally, cracks (cracks) have occurred at the end of the expanded graphite tape in the width direction. There is. The larger the number of cracks, the larger the cracks, and the greater the number of knitting yarns with cracks, the worse the seal performance of the gland packing. Will come.

  In addition, even if there is no crack immediately after the production of the gland packing, after the production, the crack may occur when the gland packing is compression-molded to a predetermined dimension or compression-molded into a ring shape. When the device is sealed as a set, the crack may occur due to a strong tightening force. Of course, if the crack is generated immediately after the production of the gland packing, the crack is enlarged by the compression molding or the tightening force.

  Accordingly, an object of the present invention is to provide a gland packing capable of suppressing deterioration in seal performance due to the above-described cracks that occur unintentionally.

  In order to achieve the above object, the gland packing according to the first aspect of the present invention is the knitting yarn in the braided gland packing, wherein the entire outer periphery of the expanded graphite tape has a mesh without using an adhesive or a fusing material. The expanded graphite tape is covered with only a reinforcing wire made of knitted or braided, and is folded so as to shrink in the width direction, and both ends in the width direction of the folded expanded graphite tape are folded back. The knitting yarn is provided.

  Further, in the gland packing according to the invention described in claim 2, in the knitting yarn in the twisted gland packing, the reinforcing wire is embedded in the longitudinal direction inside the expanded graphite tape exposing the entire outer periphery. The expanded graphite tape is folded so as to shrink in the width direction, and a knitting yarn is provided in which both ends of the folded expanded graphite tape in the width direction are folded back.

  The gland packing according to the invention of claim 3 is a knit knitting or braided body in which the entire outer periphery of the expanded graphite tape has a mesh without using an adhesive or a fusion material in the knitting yarn in the braided gland packing. The expanded graphite tape is covered only with the reinforcing wire, and both ends in the width direction of the expanded graphite tape are folded back, and the folded expanded graphite tape is twisted. It is characterized by.

  In the gland packing according to the invention described in claim 4, in the knitting yarn in the twisted gland packing, a reinforcing wire is embedded in the longitudinal direction inside the expanded graphite tape exposing the entire outer periphery, and Both ends of the expanded graphite tape in the width direction are folded back to each other, and a knitting yarn is provided in which the folded expanded graphite tape is twisted.

  A gland packing according to a fifth aspect of the present invention is the gland packing according to any of the third and fourth aspects, wherein both ends in the width direction of the expanded graphite tape are opposed to each other with their edges separated. It is characterized by being folded back in the direction of.

According to the gland packing according to the first and second aspects of the present invention, in the knitting yarn in the gland packing, the tension graphite tape bent so as to shrink in the width direction is further folded at both ends in the width direction. By providing the knitting yarn, even if a crack is generated at the end in the width direction of the expanded graphite tape, if the crack is large, the expanded graphite tape is folded and reduced. In the case of a crack, it is in a state facing the outer piece of the expanded graphite tape that has been bent, and since the crack is not exposed in a state of being straightened out as it is, it suppresses deterioration of the seal performance of the gland packing. be able to.
In addition, the gland packing according to claim 1 or 2 may be compression-molded to a predetermined size after production, or may be compression-molded to form a ring, and when sealing as a set to the device, Even in such a case, if the knitting yarn as described above is provided, the both ends of the expanded graphite tape in the width direction are folded back, so that cracks hardly occur, and In the case where a crack is generated, the expansion of the crack can be suppressed.
Furthermore, the more knitting yarns as described above are added in the gland packing, the less the influence of cracks at the end of the expanded graphite tape in the width direction, and the more effective the deterioration of the sealing performance of the gland packing due to this crack. Can be suppressed.
In the gland packing according to the third, fourth, and fifth inventions, both ends of the expanded graphite tape in the width direction are folded back into the plurality of knitting yarns, and the folded expanded graphite is folded. Since the knitting yarn in which the tape is twisted is provided, cracks are generated at the end portion in the width direction of the expanded graphite tape as in the case of the gland packing according to the first and second aspects of the invention. However, if the crack is large, it will be folded and reduced, and if the crack is small, it will face the outer piece of the expanded graphite tape, preventing deterioration of the seal performance of the gland packing. can do. Further, even after the production, there is an advantage that cracks are hardly generated at the end portion in the width direction of the expanded graphite tape, like the gland packing according to the first and second aspects of the invention. Further, as the knitting yarn as described above is increased in the gland packing, the deterioration of the sealing performance of the gland packing due to the crack at the outer end of the expanded graphite tape can be more effectively suppressed.

  According to the gland packing of the present invention, it is possible to suppress a situation in which the seal performance of the gland packing is deteriorated due to a crack generated at or from an end of the expanded graphite tape in the width direction, and reliable. It is possible to provide a gland packing that exhibits high performance and stable sealing performance.

It is a general | schematic external appearance perspective view which shows an example of embodiment of the braided gland packing which concerns on invention of Claim 1,3,5. It is a general | schematic external appearance perspective view which shows an example of embodiment of the gland packing by which the twist process which concerns on invention of Claim 2, 4 and 5 was carried out. It is a partial expansion perspective view which shows the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. It is sectional drawing of the knitting yarn of FIG. It is sectional drawing of the knitting yarn of a comparative example. (A)-(C) are sectional drawings which show other embodiment of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. FIG. (A)-(E) are sectional drawings which show the knitting yarn combined with the knitting yarn of the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. FIG. It is sectional drawing which shows other embodiment of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. It is sectional drawing which shows embodiment of the knitting yarn in the gland packing which concerns on invention of Claim 2. It is sectional drawing which shows the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3, 5. FIG. It is a perspective view which shows the state which unwinded the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3, 5. FIG. It is sectional drawing which shows the knitting yarn combined with the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3. It is a perspective view shown in the state where other embodiments of the knitting yarn in the gland packing which is an embodiment of gland packing concerning the invention of Claim 3 were unwound. It is sectional drawing which shows the other deformation | transformation form of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3. It is sectional drawing which shows the further another deformation | transformation form of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3, 5. As shown in FIG. It is sectional drawing which shows embodiment of the knitting yarn in the gland packing based on the invention of Claims 4 and 5.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a schematic external perspective view of an example of an embodiment of a braided gland packing according to the invention as set forth in claim 1, and FIG. 2 is a twisted gland packing according to the invention as set forth in claim 2. It is an outline appearance perspective view of an example which is an embodiment.
In these braided gland packings 1 and twisted gland packings 2, at least one, preferably more than half, and more preferably all of the knitting yarns 10 constituting them have a predetermined width as shown in FIG. The expanded graphite tape 30 is folded into a valley fold in the longitudinal direction so as to shrink in the width direction, and both end portions 31, 31 of the folded expanded graphite tape 30 in the width direction face the inside of the expanded graphite tape 30. The knitting yarn 10A is provided that is covered only with the reinforcing wire 40 made of a knit knitting or braided body having a mesh without using an adhesive or a fusion material.

  Examples of the reinforcing wire 40 of the knitting yarn 10A include metal wires such as stainless steel, inconel, and monel, organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, and PEEK, carbon fibers, and ceramic fibers. Inorganic fibers can be used as appropriate.

  Further, in the gland packings 1 and 2, as the knitting yarn that is not the knitting yarn 10A, an appropriate knitting yarn using expanded graphite or expanded graphite tape can be used. For example, FIG. ) (B) (C) (D) (E), the expanded graphite tape 30 having a predetermined width is bent so as to shrink in the width direction, and the entire outer periphery of the expanded graphite tape 30 is folded with adhesive or fusion. What is covered with only the reinforcing wire 40 made of a knit knitted or braided body having a mesh without using a material is preferable because it is the same type.

  If such a knitting yarn 10A is provided in the braided gland packing 1 or in the twisted gland packing 2, as shown in FIG. 4, end portions 31, 31 in the width direction of the expanded graphite tape 30 are provided. Even if cracks 32 and 32 are generated, the cracks 32 and 32 are in the inside (inside) of the outer piece 33 of the folded expanded graphite tape 30 and face the outer piece 33. 5, the deterioration of the sealing performance of the gland packings 1 and 2 can be suppressed as compared with the case where the cracks 32 and 32 are directly exposed to the outside as they are.

  Further, even when the cracks 32 and 32 of the end portions 31 and 31 of the expanded graphite tape 30 are considerably large, overcoming the end portions 31 and 31 and reaching the outer piece portion 33, Since the cracks 32 and 32 are folded into, for example, two and are reduced, the deterioration of the sealing performance of the gland packings 1 and 2 can be suppressed.

  Further, after the gland packings 1 and 2 are manufactured, the above knitting yarn is also compressed when it is compression-molded to a predetermined size, compression-molded on a ring, or subjected to a large tightening force at the time of sealing. If 10A is provided, since the end portions 31 and 31 in the width direction of the expanded graphite tape 30 are folded back, generation of cracks and expansion of cracks can be suppressed.

  As the knitting yarn 10A as described above is increased in the gland packings 1 and 2, the influence of cracks in the end portions 31 and 31 in the width direction of the expanded graphite tape 30 is reduced. Of course, the deterioration of the seal performance of No. 2 can be more effectively suppressed.

  In the above embodiment, the case where at least one or more of the gland packings 1 and 2 are used as the knitting yarn 10A has been shown, but of course, the present invention is not limited to the form of the knitting yarn 10A. For example, FIGS. (C) may be in the form of a knitting yarn 10A, and the bending method of bending the expanded graphite tape 30 so as to shrink in the width direction, and the end portions 31 and 31 in the width direction of the expanded graphite tape 30 are provided. The other way of folding may be used. In addition, about each knitting yarn 10A of FIG. 6 (A) (B) (C), description is abbreviate | omitted by attaching | subjecting the same code | symbol to the part corresponding to the knitting yarn 10A of the said embodiment.

  Further, the folding direction is not limited to the case where the both end portions 31, 31 in the width direction of the expanded graphite tape 30 are folded back toward the inside (inner side) of the expanded graphite tape 30. Thus, both end portions 31 and 31 may be folded back toward the outside of the expanded graphite tape 30, one end 31 is outside the expanded graphite tape 30, and the other end 31 is the expanded graphite tape 30. It may be folded back so as to face inward.

  Further, in each of the embodiments illustrated in FIGS. 4, 6, and 8, the case where the reinforcing wire rod 40 that is a knitted or braided body having a mesh is used is shown. Instead, as shown in FIGS. 9A and 9B as an embodiment of the present invention, a reinforcing wire rod in which a plurality of wires are embedded in the longitudinal direction at a predetermined interval inside the expanded graphite tape 30 whose entire outer periphery is exposed. The knitting yarn 10A employing at least one of the reinforcing wire rods 42 arranged in the longitudinal direction between the bent expanded graphite tape 41 and the bent graphite tape 30, or the reinforcing wire rod 40 and the reinforcing wire rods 41 and 42 are all combined. The knitting yarn 10A or the knitting yarn 10A in which the reinforcing wire 40 and any one of the reinforcing wires 41 and 42 are combined may be used.

  The reinforcing wires 41 and 42 are made of metal wires such as stainless steel, inconel, and monel, and organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, and PEEK, as with the reinforcing wire 40. Inorganic fibers such as carbon fibers and ceramic fibers can be used. In some cases, the reinforcing wires 41 and 42 and the expanded graphite tape 30 may be fixed to each other with an adhesive interposed therebetween.

  Further, in the embodiment illustrated in FIGS. 4, 6, and 8 and the embodiment illustrated in FIG. 9, the case of the single expanded graphite tape 30 is shown. The present invention can also be applied by stacking a plurality of tapes 30.

Next, in the braided gland packing 1 and the twisted gland packing 2 according to the above-described embodiment shown in FIGS. 1 and 2, a case where the knitting yarn constituting them is a twisted knitting yarn 20 will be described. To do.
As shown in FIG. 10, at least one, preferably half or more, and more preferably all of the twisted knitting yarns 20, both end portions 31 ′, 31 ″ in the width direction of the expanded graphite tape 30 are The end edges are folded back (inside) so as to face each other, the folded expanded graphite tape 30 is twisted, and the entire outer periphery of the twisted expanded graphite tape 30 is bonded to the adhesive or melt. A knitting yarn 20A covered only with a reinforcing wire 40 made of a knit knitting or braided body having a mesh without using a dressing is provided.The state in which the knitting yarn 20A in the gland packings 1 and 2 is unwound. Is as shown in FIG.

  The reinforcing wire 40 of the knitting yarn 20A is also made of metal wires such as stainless steel, inconel, monel, organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, PEEK, carbon fiber, ceramic fiber, etc. Inorganic fibers can be used as appropriate.

  In the gland packings 1 and 2, as the knitting yarn that is not the knitting yarn 20A, an appropriate knitting yarn using expanded graphite or expanded graphite tape can also be used. The expanded graphite tape 30 having a predetermined width as shown is twisted, and the entire outer periphery thereof is knitted with a mesh or coated with only the reinforcing wire 40 made of a braid without using an adhesive or a fusion material. It is a thread.

  If such a knitting yarn 20A is provided in the braided gland packing 1 or in the twisted gland packing 2, as shown in FIG. 10, both end portions 31 ′, 31 in the width direction of the expanded graphite tape 30 are provided. Even if the cracks 32 and 32 are generated, the cracks 32 and 32 are in the inside (inner side) of the twisted expanded graphite tape 30 and face the outer piece 33, so that the cracks 32 and 32 are formed. As compared with a case where all of them are exposed to the outside as they are, deterioration of the seal performance of the gland packings 1 and 2 can be suppressed.

  Further, even when the cracks 32 at both end portions 31 ′ and 31 ″ of the expanded graphite tape 30 are considerably large reaching over the both end portions 31 ′ and 31 ″ and reaching the outer piece 33, the both end portions 31 ′ and 31 ″ By the folding, the cracks 32 and 32 are folded into, for example, two to be reduced, so that deterioration of the sealing performance of the gland packings 1 and 2 can be suppressed.

  Further, after the gland packings 1 and 2 are manufactured, the above knitting yarn is also compressed when it is compression-molded to a predetermined size, compression-molded on a ring, or subjected to a large tightening force at the time of sealing. If 20A is provided, since both ends 31 ′ and 31 ″ of the expanded graphite tape 30 are folded back, generation of cracks and expansion of cracks can be suppressed.

  As the knitting yarn 20A as described above is increased in the gland packings 1, 2, the influence of cracks at both end portions 31 ', 31 "in the width direction of the expanded graphite tape 30 is reduced. Of course, the deterioration of the seal performance of 1 and 2 can be more effectively suppressed.

  In the above embodiment, the case where at least one of the gland packings 1 and 2 is used as the knitting yarn 20A is shown. Of course, the shape of the knitting yarn 20A is the outer end of the expanded graphite tape 30 in the width direction. It is not limited to the case where both 31 ′ and the inner end 31 ″ are folded inward, although not shown, both may be folded outward, or the direction in which both are folded back may be reversed.

  Further, when the expanded graphite tape 30 is set to have a wide width, both end portions 31 ′ in the width direction of the expanded graphite tape 30 are shown in FIG. The folding directions of 31 ″ may be reversed and the width direction may be bent or folded so as to be contracted.

  Furthermore, the folded form as shown in FIG. 14 shown in the cross-sectional state of the knitting yarn 20 </ b> A in the gland packings 1 and 2 may be used. As a method of covering the expanded graphite tape 30 with the reinforcing wire 40, the reinforcing wire 40 is used. May be in a covering form such that is interposed in the folded surface of the expanded graphite tape 30.

  That is, the covering form of the expanded graphite tape 30 with the reinforcing wire 40, the folded form of both end portions 31'31 "in the width direction of the expanded graphite tape 30, and the folded direction are not limited to the above embodiment.

  Moreover, in each embodiment illustrated in FIG. 10, FIG. 11, FIG. 13, FIG. 14, and FIG. 15, the case where the reinforcing wire rod 40 that is a knitted or braided covering is used is shown. Instead of the reinforcing wire 40, a reinforcing wire 41 in which a plurality of wires are embedded in the longitudinal direction at predetermined intervals inside the expanded graphite tape 30 with the entire outer periphery exposed as shown in FIG. 16 as an embodiment of the present invention. And the knitting yarn 20A that employs at least one of the reinforcing wire rods 42 arranged in the longitudinal direction between the expanded graphite tapes 30 that are bent, or the reinforcing wire rod 40 and the reinforcing wire rods 41 and 42 are all combined. The knitting yarn 20A, or the knitting yarn 20A in which the reinforcing wire 40 and any one of the reinforcing wires 41 and 42 are combined may be used.

  As described above, the reinforcing wires 41 and 42 may be made of metal wires such as stainless steel, inconel and monel, organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS and PEEK, carbon. Needless to say, inorganic fibers such as fibers and ceramic fibers can be used as appropriate, and in some cases, the reinforcing wires 41 and 42 and the expanded graphite tape 30 may be fixed to each other with an adhesive interposed therebetween. It goes without saying that it is good.

  Further, in each of the embodiments illustrated in FIGS. 10, 11, 13, 14, and 15 and the embodiment illustrated in FIG. 16, the case where one piece of the expanded graphite tape 30 is used is shown. Needless to say, the present invention can be carried out by stacking a plurality of expanded graphite tapes 30.

  Furthermore, although it can be said that it is common to the said embodiment and embodiment, it is not limited to the braided gland packing 1 and the twist gland packing 2 illustrated in FIGS. It can be applied to various braided gland packings and twisted gland packings, and the characteristic time of forming the knitting yarn in the gland packing of the present invention is not limited to before braiding or twisting, The expanded graphite may be at the time of braiding or twisting, and further, when the gland packing is compression-molded to a predetermined size, formed into a ring shape, or received a strong clamping force when set in a device. When it is desired to suppress the occurrence of cracks and the expansion of cracks at the end of the tape 30 in the width direction, it is folded when the compressive force is applied. It is also possible to control the spread of crack generation and crack and to be completed.

DESCRIPTION OF SYMBOLS 1 Braided gland packing 2 Twisted gland packing 10 Knitting yarn in gland packing 10A Knitted yarn in which both ends of expanded graphite tape are folded 20 Knitting yarn in gland packing 20A The outer end of expanded graphite tape is folded Knitted yarn 30 Expanded graphite tape 31 Expanded graphite tape width end 31 'Expanded graphite tape width outer end 31 "Expanded graphite tape width inner end 32 Crack 33 Expanded graphite tape Outer piece 40 Reinforcement wire 41 Reinforcement wire 42 Reinforcement wire

  The present invention relates to a gland packing used for a shaft seal portion of a fluid device.

  Conventionally, as a plurality of knitting yarns in a braided gland packing, for example, knitting yarns described in Japanese Patent Publication No. 6-27546 and JP-A-6-74346 are known. The knitting yarn is bent so that the expanded graphite tape is contracted in the width direction, and the entire outer periphery of the bent expanded graphite tape has a mesh without using an adhesive or a fusing material. It is covered only with a reinforcing material made of a body.

  By the way, expanded graphite tape is vulnerable to tension and torsion, so in the knitting yarn in the gland packing, unintentionally, cracks (cracks) have occurred at the end of the expanded graphite tape in the width direction. There is. The larger the number of cracks, the larger the cracks, and the greater the number of knitting yarns with cracks, the worse the seal performance of the gland packing. Will come.

  In addition, even if there is no crack immediately after the production of the gland packing, after the production, the crack may occur when the gland packing is compression-molded to a predetermined dimension or compression-molded into a ring shape. When the device is sealed as a set, the crack may occur due to a strong tightening force. Of course, if the crack is generated immediately after the production of the gland packing, the crack is enlarged by the compression molding or the tightening force.

  Accordingly, an object of the present invention is to provide a gland packing capable of suppressing deterioration in seal performance due to the above-described cracks that occur unintentionally.

To achieve the above object, the gland packing of the invention according to claim 1, in yarns in a braided gland packing, it is bent so as Rise Zhang graphite tape shrinks in the width direction, and is the bent Both ends of the expanded graphite tape in the width direction are folded back , and the entire outer periphery of the expanded graphite tape is only a reinforcing wire made of a knit knitted or braided body having a mesh without using an adhesive or a fusion material. The expanded graphite tape is provided with a coated knitting yarn , and the folded width of each folded end of the expanded graphite tape is continuous with and adjacent to the end in the width direction of the expanded graphite tape. It is characterized by being set shorter than the length of one part .

Further, the gland packing according to the invention of claim 2, twist in the processed yarn in the gland packing has, Rise Zhang graphite tape is bent so as to shrink in the width direction, and the bent expanded graphite Both ends of the tape in the width direction are folded back , and a knitted yarn in which a reinforcing wire is embedded in the longitudinal direction inside the expanded graphite tape is provided , and with respect to the width direction of the expanded graphite tape, the expanded graphite The folded width of each end portion where the tape is folded is set shorter than the length of one piece of the expanded graphite tape which is continuous and adjacent to the end portion .

Gland packing according to the invention described in claim 3 is the yarn in the braided gland packing has been folded back end portions in the width direction of the Rise Zhang graphite tape each other, and the folded expanded graphite tape twisting process And the entire outer periphery of the expanded graphite tape is provided with a knitting yarn covered only with a reinforcing wire made of a knit knitting or braided body having a mesh without using an adhesive or a fusion material , With respect to the width direction of the expanded graphite tape, the folded width of each folded end of the expanded graphite tape is set to be less than half of the length of one portion of the expanded graphite tape that is continuous and adjacent to the end. It is characterized by.

Gland packing according to the invention of claim 4 is the yarns in a gland packing that twist processing, both ends in the width direction of the Rise Zhang graphite tape which is folded together, and the folded expanded graphite tape Each end of the expanded graphite tape that is folded back is provided with a knitting yarn that is twisted and has a reinforcing wire embedded in the longitudinal direction inside the expanded graphite tape. The folded width of the portion is set to be less than half of the length of the piece of the expanded graphite tape which is continuous and adjacent to the end portion .

  A gland packing according to a fifth aspect of the present invention is the gland packing according to any of the third and fourth aspects, wherein both ends in the width direction of the expanded graphite tape are opposed to each other with their edges separated. It is characterized by being folded back in the direction of.

According to the gland packing according to the first and second aspects of the present invention, in the knitting yarn in the gland packing, the tension graphite tape bent so as to shrink in the width direction is further folded at both ends in the width direction. By providing the knitting yarn, even if a crack is generated at the end in the width direction of the expanded graphite tape, if the crack is large, the expanded graphite tape is folded and reduced. In the case of a crack, it is in a state facing the outer piece of the expanded graphite tape that has been bent, and since the crack is not exposed in a state of being straightened out as it is, it suppresses deterioration of the seal performance of the gland packing. be able to.
In addition, the gland packing according to claim 1 or 2 may be compression-molded to a predetermined size after production, or may be compression-molded to form a ring, and when sealing as a set to the device, Even in such a case, if the knitting yarn as described above is provided, the both ends of the expanded graphite tape in the width direction are folded back, so that cracks hardly occur, and In the case where a crack is generated, the expansion of the crack can be suppressed.
Furthermore, the more knitting yarns as described above are added in the gland packing, the less the influence of cracks at the end of the expanded graphite tape in the width direction, and the more effective the deterioration of the sealing performance of the gland packing due to this crack. Can be suppressed.
In the gland packing according to the third, fourth, and fifth inventions, both ends of the expanded graphite tape in the width direction are folded back into the plurality of knitting yarns, and the folded expanded graphite is folded. Since the knitting yarn in which the tape is twisted is provided, cracks are generated at the end portion in the width direction of the expanded graphite tape as in the case of the gland packing according to the first and second aspects of the invention. However, if the crack is large, it will be folded and reduced, and if the crack is small, it will face the outer piece of the expanded graphite tape, preventing deterioration of the seal performance of the gland packing. can do. Further, even after the production, there is an advantage that cracks are hardly generated at the end portion in the width direction of the expanded graphite tape, like the gland packing according to the first and second aspects of the invention. Further, as the knitting yarn as described above is increased in the gland packing, the deterioration of the sealing performance of the gland packing due to the crack at the outer end of the expanded graphite tape can be more effectively suppressed.

  According to the gland packing of the present invention, it is possible to suppress a situation in which the seal performance of the gland packing is deteriorated due to a crack generated at or from an end of the expanded graphite tape in the width direction, and reliable. It is possible to provide a gland packing that exhibits high performance and stable sealing performance.

It is a general | schematic external appearance perspective view which shows an example of embodiment of the braided gland packing which concerns on invention of Claim 1,3,5. It is a general | schematic external appearance perspective view which shows an example of embodiment of the gland packing by which the twist process which concerns on invention of Claim 2, 4 and 5 was carried out. It is a partial expansion perspective view which shows the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. It is sectional drawing of the knitting yarn of FIG. It is sectional drawing of the knitting yarn of a comparative example. (A)-(C) are sectional drawings which show other embodiment of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. FIG. (A)-(E) are sectional drawings which show the knitting yarn combined with the knitting yarn of the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. FIG. It is sectional drawing which shows other embodiment of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 1. It is sectional drawing which shows embodiment of the knitting yarn in the gland packing which concerns on invention of Claim 2. It is sectional drawing which shows the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3, 5. FIG. It is a perspective view which shows the state which unwinded the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3, 5. FIG. It is sectional drawing which shows the knitting yarn combined with the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3. It is a perspective view shown in the state where other embodiments of the knitting yarn in the gland packing which is an embodiment of gland packing concerning the invention of Claim 3 were unwound. It is sectional drawing which shows the other deformation | transformation form of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3. It is sectional drawing which shows the further another deformation | transformation form of the knitting yarn in the gland packing which is embodiment of the gland packing which concerns on invention of Claim 3, 5. As shown in FIG. It is sectional drawing which shows embodiment of the knitting yarn in the gland packing based on the invention of Claims 4 and 5.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a schematic external perspective view of an example of an embodiment of a braided gland packing according to the invention as set forth in claim 1, and FIG. 2 is a twisted gland packing according to the invention as set forth in claim 2. It is an outline appearance perspective view of an example which is an embodiment.
In these braided gland packings 1 and twisted gland packings 2, at least one, preferably more than half, and more preferably all of the knitting yarns 10 constituting them have a predetermined width as shown in FIG. The expanded graphite tape 30 is folded into a valley fold in the longitudinal direction so as to shrink in the width direction, and both end portions 31, 31 of the folded expanded graphite tape 30 in the width direction face the inside of the expanded graphite tape 30. The knitting yarn 10A is provided that is covered only with the reinforcing wire 40 made of a knit knitting or braided body having a mesh without using an adhesive or a fusion material.

  Examples of the reinforcing wire 40 of the knitting yarn 10A include metal wires such as stainless steel, inconel, and monel, organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, and PEEK, carbon fibers, and ceramic fibers. Inorganic fibers can be used as appropriate.

  Further, in the gland packings 1 and 2, as the knitting yarn that is not the knitting yarn 10A, an appropriate knitting yarn using expanded graphite or expanded graphite tape can be used. For example, FIG. ) (B) (C) (D) (E), the expanded graphite tape 30 having a predetermined width is bent so as to shrink in the width direction, and the entire outer periphery of the expanded graphite tape 30 is folded with adhesive or fusion. What is covered with only the reinforcing wire 40 made of a knit knitted or braided body having a mesh without using a material is preferable because it is the same type.

  If such a knitting yarn 10A is provided in the braided gland packing 1 or in the twisted gland packing 2, as shown in FIG. 4, end portions 31, 31 in the width direction of the expanded graphite tape 30 are provided. Even if cracks 32 and 32 are generated, the cracks 32 and 32 are in the inside (inside) of the outer piece 33 of the folded expanded graphite tape 30 and face the outer piece 33. 5, the deterioration of the sealing performance of the gland packings 1 and 2 can be suppressed as compared with the case where the cracks 32 and 32 are directly exposed to the outside as they are.

  Further, even when the cracks 32 and 32 of the end portions 31 and 31 of the expanded graphite tape 30 are considerably large, overcoming the end portions 31 and 31 and reaching the outer piece portion 33, Since the cracks 32 and 32 are folded into, for example, two and are reduced, the deterioration of the sealing performance of the gland packings 1 and 2 can be suppressed.

  Further, after the gland packings 1 and 2 are manufactured, the above knitting yarn is also compressed when it is compression-molded to a predetermined size, compression-molded on a ring, or subjected to a large tightening force at the time of sealing. If 10A is provided, since the end portions 31 and 31 in the width direction of the expanded graphite tape 30 are folded back, generation of cracks and expansion of cracks can be suppressed.

  As the knitting yarn 10A as described above is increased in the gland packings 1 and 2, the influence of cracks in the end portions 31 and 31 in the width direction of the expanded graphite tape 30 is reduced. Of course, the deterioration of the seal performance of No. 2 can be more effectively suppressed.

  In the above embodiment, the case where at least one or more of the gland packings 1 and 2 are used as the knitting yarn 10A has been shown, but of course, the present invention is not limited to the form of the knitting yarn 10A. For example, FIGS. (C) may be in the form of a knitting yarn 10A, and the bending method of bending the expanded graphite tape 30 so as to shrink in the width direction, and the end portions 31 and 31 in the width direction of the expanded graphite tape 30 are provided. The other way of folding may be used. In addition, about each knitting yarn 10A of FIG. 6 (A) (B) (C), description is abbreviate | omitted by attaching | subjecting the same code | symbol to the part corresponding to the knitting yarn 10A of the said embodiment.

  Further, the folding direction is not limited to the case where the both end portions 31, 31 in the width direction of the expanded graphite tape 30 are folded back toward the inside (inner side) of the expanded graphite tape 30. Thus, both end portions 31 and 31 may be folded back toward the outside of the expanded graphite tape 30, one end 31 is outside the expanded graphite tape 30, and the other end 31 is the expanded graphite tape 30. It may be folded back so as to face inward.

  Further, in each of the embodiments illustrated in FIGS. 4, 6, and 8, the case where the reinforcing wire rod 40 that is a knitted or braided body having a mesh is used is shown. Instead, as shown in FIGS. 9A and 9B as an embodiment of the present invention, a reinforcing wire rod in which a plurality of wires are embedded in the longitudinal direction at a predetermined interval inside the expanded graphite tape 30 whose entire outer periphery is exposed. The knitting yarn 10A employing at least one of the reinforcing wire rods 42 arranged in the longitudinal direction between the bent expanded graphite tape 41 and the bent graphite tape 30, or the reinforcing wire rod 40 and the reinforcing wire rods 41 and 42 are all combined. The knitting yarn 10A or the knitting yarn 10A in which the reinforcing wire 40 and any one of the reinforcing wires 41 and 42 are combined may be used.

  The reinforcing wires 41 and 42 are made of metal wires such as stainless steel, inconel, and monel, and organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, and PEEK, as with the reinforcing wire 40. Inorganic fibers such as carbon fibers and ceramic fibers can be used. In some cases, the reinforcing wires 41 and 42 and the expanded graphite tape 30 may be fixed to each other with an adhesive interposed therebetween.

  Further, in the embodiment illustrated in FIGS. 4, 6, and 8 and the embodiment illustrated in FIG. 9, the case of the single expanded graphite tape 30 is shown. The present invention can also be applied by stacking a plurality of tapes 30.

Next, in the braided gland packing 1 and the twisted gland packing 2 according to the above-described embodiment shown in FIGS. 1 and 2, a case where the knitting yarn constituting them is a twisted knitting yarn 20 will be described. To do.
As shown in FIG. 10, at least one, preferably half or more, and more preferably all of the twisted knitting yarns 20, both end portions 31 ′, 31 ″ in the width direction of the expanded graphite tape 30 are The end edges are folded back (inside) so as to face each other, the folded expanded graphite tape 30 is twisted, and the entire outer periphery of the twisted expanded graphite tape 30 is bonded to the adhesive or melt. A knitting yarn 20A covered only with a reinforcing wire 40 made of a knit knitting or braided body having a mesh without using a dressing is provided.The state in which the knitting yarn 20A in the gland packings 1 and 2 is unwound. Is as shown in FIG.

  The reinforcing wire 40 of the knitting yarn 20A is also made of metal wires such as stainless steel, inconel, monel, organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS, PEEK, carbon fiber, ceramic fiber, etc. Inorganic fibers can be used as appropriate.

  In the gland packings 1 and 2, as the knitting yarn that is not the knitting yarn 20A, an appropriate knitting yarn using expanded graphite or expanded graphite tape can also be used. The expanded graphite tape 30 having a predetermined width as shown is twisted, and the entire outer periphery thereof is knitted with a mesh or coated with only the reinforcing wire 40 made of a braid without using an adhesive or a fusion material. It is a thread.

  If such a knitting yarn 20A is provided in the braided gland packing 1 or in the twisted gland packing 2, as shown in FIG. 10, both end portions 31 ′, 31 in the width direction of the expanded graphite tape 30 are provided. Even if the cracks 32 and 32 are generated, the cracks 32 and 32 are in the inside (inner side) of the twisted expanded graphite tape 30 and face the outer piece 33, so that the cracks 32 and 32 are formed. As compared with a case where all of them are exposed to the outside as they are, deterioration of the seal performance of the gland packings 1 and 2 can be suppressed.

Further, cracks 32 at both end portions 31 ′, 31 ″ of the expanded graphite tape 30 are formed at both end portions 31 ′,
Even when the outer side 33 is considerably large after overcoming 31 ″, the cracks 32 and 32 are folded and reduced, for example, by folding the both ends 31 ′ and 31 ″. The deterioration of the sealing performance of the packings 1 and 2 can be suppressed.

  Further, after the gland packings 1 and 2 are manufactured, the above knitting yarn is also compressed when it is compression-molded to a predetermined size, compression-molded on a ring, or subjected to a large tightening force at the time of sealing. If 20A is provided, since both ends 31 ′ and 31 ″ of the expanded graphite tape 30 are folded back, generation of cracks and expansion of cracks can be suppressed.

  As the knitting yarn 20A as described above is increased in the gland packings 1, 2, the influence of cracks at both end portions 31 ', 31 "in the width direction of the expanded graphite tape 30 is reduced. Of course, the deterioration of the seal performance of 1 and 2 can be more effectively suppressed.

  In the above embodiment, the case where at least one of the gland packings 1 and 2 is used as the knitting yarn 20A is shown. Of course, the shape of the knitting yarn 20A is the outer end of the expanded graphite tape 30 in the width direction. It is not limited to the case where both 31 ′ and the inner end 31 ″ are folded inward, although not shown, both may be folded outward, or the direction in which both are folded back may be reversed.

  Further, when the expanded graphite tape 30 is set to have a wide width, both end portions 31 ′ in the width direction of the expanded graphite tape 30 are shown in FIG. The folding directions of 31 ″ may be reversed and the width direction may be bent or folded so as to be contracted.

  Furthermore, the folded form as shown in FIG. 14 shown in the cross-sectional state of the knitting yarn 20 </ b> A in the gland packings 1 and 2 may be used. As a method of covering the expanded graphite tape 30 with the reinforcing wire 40, the reinforcing wire 40 May be in a covering form such that is interposed in the folded surface of the expanded graphite tape 30.

  That is, the covering form of the expanded graphite tape 30 with the reinforcing wire 40, the folded form of both end portions 31'31 "in the width direction of the expanded graphite tape 30, and the folded direction are not limited to the above embodiment.

  Moreover, in each embodiment illustrated in FIG. 10, FIG. 11, FIG. 13, FIG. 14, and FIG. 15, the case where the reinforcing wire rod 40 that is a knitted or braided covering is used is shown. Instead of the reinforcing wire 40, a reinforcing wire 41 in which a plurality of wires are embedded in the longitudinal direction at predetermined intervals inside the expanded graphite tape 30 with the entire outer periphery exposed as shown in FIG. 16 as an embodiment of the present invention. And the knitting yarn 20A that employs at least one of the reinforcing wire rods 42 arranged in the longitudinal direction between the expanded graphite tapes 30 that are bent, or the reinforcing wire rod 40 and the reinforcing wire rods 41 and 42 are all combined. The knitting yarn 20A, or the knitting yarn 20A in which the reinforcing wire 40 and any one of the reinforcing wires 41 and 42 are combined may be used.

  As described above, the reinforcing wires 41 and 42 may be made of metal wires such as stainless steel, inconel and monel, organic fibers such as cotton, rayon, phenol, aramid, PBO, PBI, PTFE, PPS and PEEK, carbon. Needless to say, inorganic fibers such as fibers and ceramic fibers can be used as appropriate, and in some cases, the reinforcing wires 41 and 42 and the expanded graphite tape 30 may be fixed to each other with an adhesive interposed therebetween. It goes without saying that it is good.

  Further, in each of the embodiments illustrated in FIGS. 10, 11, 13, 14, and 15 and the embodiment illustrated in FIG. 16, the case where one piece of the expanded graphite tape 30 is used is shown. Needless to say, the present invention can be carried out by stacking a plurality of expanded graphite tapes 30.

  Furthermore, although it can be said that it is common to the said embodiment and embodiment, it is not limited to the braided gland packing 1 and the twist gland packing 2 illustrated in FIGS. It can be applied to various braided gland packings and twisted gland packings, and the characteristic time of forming the knitting yarn in the gland packing of the present invention is not limited to before braiding or twisting, The expanded graphite may be at the time of braiding or twisting, and further, when the gland packing is compression-molded to a predetermined size, formed into a ring shape, or received a strong clamping force when set in a device. When it is desired to suppress the occurrence of cracks and the expansion of cracks at the end of the tape 30 in the width direction, it is folded when the compressive force is applied. It is also possible to control the spread of crack generation and crack and to be completed.

DESCRIPTION OF SYMBOLS 1 Braided gland packing 2 Twisted gland packing 10 Knitting yarn in gland packing 10A Knitted yarn in which both ends of expanded graphite tape are folded 20 Knitting yarn in gland packing 20A The outer end of expanded graphite tape is folded Knitted yarn 30 Expanded graphite tape 31 Expanded graphite tape width end 31 'Expanded graphite tape width outer end 31 "Expanded graphite tape width inner end 32 Crack 33 Expanded graphite tape Outer piece 40 Reinforcement wire 41 Reinforcement wire 42 Reinforcement wire

Claims (5)

  In a plurality of knitting yarns in the braided gland packing, the entire outer periphery of the expanded graphite tape is composed of a knit knitting or a braided body having a mesh without using an adhesive or a fusion material. Covered only with a reinforcing wire, and the expanded graphite tape is folded so as to shrink in the width direction, and a knitting yarn is provided in which both ends of the folded expanded graphite tape are folded. A gland packing characterized by   In a plurality of knitting yarns in the twisted gland packing, a reinforcing wire is embedded in the knitting yarn in the longitudinal direction inside the expanded graphite tape with the entire outer periphery exposed, and the expansion A gland packing comprising a knitted yarn in which a graphite tape is bent so as to shrink in the width direction, and both ends of the bent expanded graphite tape in the width direction are folded back.   In a plurality of knitting yarns in the braided gland packing, the entire outer periphery of the expanded graphite tape is composed of a knit knitting or a braided body having a mesh without using an adhesive or a fusion material. It is covered with a reinforcing wire only, and both ends in the width direction of the expanded graphite tape are folded back, and the folded expanded graphite tape is provided with a knitting yarn that is twisted. Features a gland packing.   In a plurality of knitting yarns in the twisted gland packing, a reinforcing wire is embedded in the knitting yarn in the longitudinal direction inside the expanded graphite tape with the entire outer periphery exposed, and the expansion A gland packing comprising a knitting yarn in which both ends in the width direction of the graphite tape are folded back to each other and the folded expanded graphite tape is twisted.   5. The gland packing according to claim 3, wherein both end portions in the width direction of the expanded graphite tape are folded back in directions facing each other with their end edges separated from each other.

Images