CN1045982C

CN1045982C - Sealing filler

Info

Publication number: CN1045982C
Application number: CN93105200A
Authority: CN
Inventors: 上田隆久; 盐见富一
Original assignee: Nippon Pillar Packing Co Ltd
Current assignee: Nippon Pillar Packing Co Ltd
Priority date: 1991-11-21
Filing date: 1993-04-05
Publication date: 1999-10-27
Anticipated expiration: 2013-04-05
Also published as: CN1093390A; JPH05339558A; JPH0689322B2

Abstract

The present invention provides a sealing material which can protect a base material against damage, such as cracking, etc. during weaving processing or twisting processing and can ensure that corrosion-resistant performance and sealing performance can not be quickly weakened, wherein the base material is prepared from expanded graphite coated by reinforcing materials. The sealing material is prepared by coating the reinforcing materials on the surface of the base material prepared from the expanded graphite. Expansion rate of the expanded graphite used in the base material is more than 40 times, the graphite content is more than 90 wt%, and the density of the base material is more than 0.3 g/cm<3>.

Description

Lock packing

The present invention relates to a kind of lock packing that use, that be used as the structured material of gland packing at the shaft sealing place of grading of fluid machinery.

Lock packing in the past, for example with weaving or turn round the lock packing of twisting the gland seal filler that processes, in order to break away from the use asbestos, adopt the good expanded graphite sheet of thermotolerance and stopping property as body material, again for the weakness of the tensile strength difference that remedies this expanded graphite sheet, employing is in the periphery of the body material of being made by expanded graphite sheet, the structure of using the strongthener made by various fibers that it is wrapped up.

Yet the expanded graphite sheet that constitutes above-mentioned body material is that well-known lepidiod natural graphite is expand into after the worm, is configured as this expanded graphite flaky again.This with above-mentioned in the past the lock packing of expanded graphite sheet as body material, when braiding, not only strongthener must be arranged, and, in this body material, often produce the be full of cracks equivalent damage because above-mentioned body material has been applied bigger drawing force.In addition, because in its body material of in the past lock packing, the impurity that in expanded graphite, contains a lot of ash contents and residual Sulfur and so on, by these a large amount of impurity expanded graphite particles physical adsorption power is each other weakened, this just becomes the reason that body material tensile strength descends, also because the oxidation of a large amount of impurity is just corroded body material in early days, corrosion resisting property of the lock packing of making and the problem that sealing property descends are long since arranged simultaneously.

The present invention signs in above-mentioned practical situation and puts forward.Its objective is provides a kind of lock packing, the body material that this filler is made at the expanded graphite that coats with strongthener weaves or turns round to twist to add and can prevent the be full of cracks damage man-hour, and its corrosion resisting property and sealing property are not just descended in early days.

To achieve the above object, lock packing of the present invention has with the made body material of expanded graphite shaping, and be coated on strongthener on this substrate material surface, above-mentioned body material uses rate of expansion at the expanded graphite more than 40 times, and content of graphite is more than 90 weight %, and its density is at 0.3g/cm ³More than.

Lock packing according to above-mentioned formation, owing to used the body material of making at the expanded graphite more than 40 times by rate of expansion, so sufficient physical adsorption power is just arranged in action between the expanded graphite particles, and, because the content of graphite is more than 90 weight %, the bad influence that ash content and so on impurity causes, just making expanded graphite particles physical adsorption power each other fall the problem at the end significantly also is improved, again again, owing to the oxidation of a large amount of impurity make body material early the corrosive phenomenon also be suppressed and end, thereby improved the long-term corrosion resistance nature and the sealing property of lock packing.In addition, since the body material density having stipulated to make with expanded graphite at 0.3g/cm ³More than, so above-mentioned expanded graphite particles has sufficient physical adsorption power each other, do not have the problem that the shape collapse takes place simultaneously under user mode yet.

Below, with reference to accompanying drawing embodiments of the invention are described.

Fig. 1 is the stereographic map of the lock packing of expression one embodiment of the present of invention,

Fig. 2 is that expression uses the described lock packing of six roots of sensation the foregoing description to turn round the stereographic map of twisting the gland seal filler after processing,

Fig. 3 is a stereographic map of representing eight described lock packing of the foregoing description are woven into quadrate gland seal filler,

Fig. 4 is a stereographic map of representing cloth is done the gland seal filler of fuse,

Fig. 5 is the stereographic map of expression line marshalling that lock packing is woven into as the gland seal filler of fuse,

Fig. 6 is the stereographic map of the shaping thing made with expanded graphite particles and rubber of expression as the gland seal filler of fuse,

Fig. 7 be expression with cloth shown in Figure 2 stereographic map as the gland seal filler of fuse,

Fig. 8 is a synoptic diagram of representing the sheet material of short slab shape is woven together the state of lock packing in manufacturing processed that uses as body material,

Fig. 9 is the stereographic map of the expression lock packing of making according to Fig. 8,

Figure 10 is a stereographic map of representing expanded graphite sheet is folded up the lock packing that constitutes as body material,

Figure 11 is the stereographic map that expression is carried out corrugated shaping lock packing afterwards to the body material of lock packing among Figure 10,

Figure 12 is that expression repeats expanded graphite sheet folding twice material back and forth as the stereographic map of the lock packing of body material,

To be expression carry out lock packing stereographic map after the corrugated shaping to the body material in the lock packing shown in Figure 12 to Figure 13,

Figure 14 is the stereographic map that the lock packing of bar-shaped body material is used in expression.

In Fig. 1, the 1st, with the body material of expanded graphite formation, the 2nd, the strongthener that on the surface of body material 1, coats.In the present embodiment, above-mentioned body material 1 is several (for example four) to be had flexible expanded graphite sheet 1A stack, thereby its tensile strength is increased.The thickness of employed each sheet expanded graphite sheet 1A is thinner, and about 0.05～0.38mm, and width is narrower, for example below 5mm.

The expanded graphite sheet that above-mentioned body material 1 uses is after the flakey natural graphite is expanded, be configured as flaky, the rate of expansion of the expanded graphite that uses in this body material 1 is more than 40 times, and content of graphite is more than 90 weight %, and the density of body material is 0.3g/cm ³More than.

Material as strongthener 2 can be chosen from following various fibers: natural fibers such as cotton, fiber crops; Nylon, artificial silk, aromatic polyamide, PBI organic fibres such as (polybenzimidazole); Inorganic fibre such as glass, pottery; Steel fibers such as Stainless Steel Fibre, Inconel(nickel alloys) fiber.Present embodiment is example with the organic fibre, for example can will be made into tubular or tubulose behind the knitting woollen yarn knitting of 40 aromatic polyamide fibre.

Like this, by strongthener 2 is coated on the above-mentioned body material 1, just constituted litzendraht 3 as lock packing.

Because in this lock packing 3, the rate of expansion of body material 1 employed expanded graphite is more than 40 times, thereby expands quite fully, and expanded graphite particles has enough physical adsorption power effects each other.In addition, though any number that rate of expansion is defined in more than 40 times directly all is fine, be best with about 200 times rate of expansion.Also, also can improve expanded graphite particles physical adsorption power each other and reduce significantly because the content of graphite more than 90 weight %, thereby can reduce the bad influence that ash content and so on impurity causes.In addition, the phenomenon that causes body material to be corroded early owing to a large amount of oxidations of impurities be can also suppress, the long-term corrosion resistance nature and the sealing property of lock packing improved.In other words the content of so-called graphite, be exactly that impurity is less than 10 weight % more than 90 weight % herein, concrete numerical value is can be arbitrarily, but learn that from various experimental results below 50%, residual Sulfur is just enough below 1000ppm as the ash content of impurity.In addition, the density owing to the body material made from expanded graphite is defined in 0.3g/cm ³More than, thereby above-mentioned expanded graphite particles physical adsorption power each other is just very abundant, does not also have the problem that the shape collapse takes place under user mode simultaneously.

Can singlely like this turn round stubborn processing by the lock packing 3 of above-mentioned composition, perhaps as illustrated in fig. 2, after for example can tying together six roots of sensation lock packing 3, with about 20 rev/min it turned round stubborn processing on one side, carry out roll milling forming on one side, make gland seal filler 5.Can also for example carry out square weave as shown in Figure 3, thereby constitute gland seal filler 6 with eight above-mentioned lock packing 3.Except this square weave, also can adopt and hand over the justice braiding to wait other modes.

As shown in Figure 4, also the fuse 7 that is woven into by many lock packing 3 can be placed in the parcel fabric by many lock packing 3 braiding (for example tubular braiding) one-tenth, make gland seal filler 9 in this way, perhaps adopt lock packing 3, and another adopts the mode of the lock packing of other kinds to make the gland seal filler with in fuse 7 and the parcel fabric any.Can also be as shown in Figure 5, any the employing lock packing 3 in the fuse 8 of many marshallings and the parcel fabric, and another adopts the lock packing of other kinds, makes gland seal filler 10 in this way.Other can also be as shown in Figure 6, places the ribbon that is become with rubber mix by expanded graphite particles as fuse 11 in the parcel fabric that is woven into many lock packing 3, makes gland seal filler 12 by this way.

In addition, as shown in Figure 7, the many lock packing 3 that can also be made into above-mentioned litzendraht are twisted fuse 14 that processing makes and are placed in the parcel fabric 13 with many lock packing 3 braiding (for example tubular braiding) one-tenth through turning round, make gland seal filler 15 in this way, perhaps, with any one the employing lock packing 3 in fuse 14 and the parcel fabric 13, and another adopts the mode of other kind lock packing to make the gland seal filler.

Fig. 8 is the stereographic map of expression another embodiment of the present invention.In this embodiment, use from natural fibers such as cotton, fiber crops; Organic fibres such as nylon, artificial silk, aromatic polyamide, PBI: inorganic fibres such as glass, pottery; The fiber of selecting in the steel fibers such as Stainless Steel Fibre, Inconel(nickel alloys) fiber, for example use 40 aromatic polyamide fibre, be woven into the strongthener 17 of tubular by methods such as knitting braiding, tubular knitted, pipe-type wovens, on the other hand, with thickness be the expanded graphite sheet of 0.38mm be cut into many wide for about 5mm, length is the short slab shape sheet material 18A of 25mm, these short slab shape sheet materials 18A as body material 18, optionally gather together, by being filled to 17 li of above-mentioned strongtheners as shown in Figure 9, form lock packing 19.In this case, the rate of expansion of above-mentioned expanded graphite, content of graphite and density all get cause value identical with the body material 1 of above-mentioned lock packing 3.And this lock packing 19 is also the same with above-mentioned lock packing 3, can make the gland seal filler according to the such mode of Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7.

Figure 10 is the stereographic map of another embodiment of expression the present invention.It is vertically folding back and forth along it the expanded graphite sheet 20 of the broad of width more than 5mm, promptly be folded into the S font, constitute the ribbon of

foldable layer

21A, 21B, 21C, this ribbon as body material 21, on the surface of this body material 21, coat again, make lock packing 23 with strongthener 22.Above-mentioned strongthener 22 can be from natural fibers such as cotton, fiber crops; Nylon, artificial silk; Organic fibre such as aromatic polyamide, PBI; Inorganic fibre such as glass, pottery: selecting for use in the steel fibers such as Stainless Steel Fibre, Inconel(nickel alloys) fiber, is the fabric that the Inconel(nickel alloys) line of 0.1mm is woven into by knitting braiding, pipe-type woven, tubular knitted method with diameter for example.Here the rate of expansion, content of graphite and the density that constitute the expanded graphite of above-mentioned body material 21 all are specified to identical with the body material 1 of above-mentioned sealing material 3.

In addition, as shown in figure 11, also can by means of corrugated processing or embossing processing (wrinkling processing), make it become the body material 24 that bellows-shaped 20A is arranged on above-mentioned each layer 21A, the 21B that is folded to form by the expanded graphite sheet 20 of wide cut, the 21C.Can access body material 24 and the very big lock packing 23 of strongthener 22 bonding forces in this way.

Also can use expanded graphite sheet shown in Figure 10 20, press it shown in Figure 12, longitudinally fold twice back and forth, make the body material 25 of

foldable layer

21A, 21B, 21C, perhaps also can longitudinally fold twice to above-mentioned expanded graphite sheet back and forth as shown in Figure 13, the shaping processing of the bellows-shaped of when forming

foldable layer

21A, 21B, 21C, seeing off, after forming ripple 20A, make body material 26.

With the body material that above-mentioned expanded graphite is made, its shape is not limited to the shape shown in Fig. 1, Fig. 8, Fig. 9, Figure 10～Figure 13, also can select various other shapes such as bar-shaped for use.The example that uses bar-shaped body material as shown in figure 14, in the solid of expanded graphite, mix a kind of material in staple fibre, rubber, resin or the lubricant at least, it is configured as bar-shaped, make body material 27, be wrapped on the surface of body material 27 with strongthener 28 again, just make lock packing 29.Strongthener 28 can be from natural fibers such as cotton, fiber crops; Organic fibres such as nylon, artificial silk, aromatic polyamide, PBI; Inorganic fibre such as glass, pottery; Select in the steel fibers such as Stainless Steel Fibre, Inconel(nickel alloys) fiber, for example, can select Inconel(nickel alloys) 600 fibers etc. for use.In addition, the rate of expansion of the expanded graphite of body material 27, content of graphite and density also are specified to identical with the body material 1 of above-mentioned lock packing 3.

In addition, as required, can block material soaking to the surface of Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and gland seal filler shown in Figure 7 with silicone oil, flaky graphite or rubber-like agent mixture etc.

As mentioned above, in the body material that the surface coats with strongthener, used rate of expansion at the expanded graphite more than 40 times according to the present invention, content of graphite is more than 90 weight %, and the density of body material is at 0.3g/cm ³More than, by means of the high rate of expansion of expanded graphite and the high-content and the formed high coherency of high-density of graphite, expanded graphite particles physical adsorption power is each other guaranteed fully, can prevent from braiding effectively or turn round to twist to add man-hour, be coated with the body material of strongthener and directly cause the be full of cracks equivalent damage owing to stretch, and, because the content of graphite height of the expanded graphite that body material uses, the grade oxidation of impurity of ash can be suppressed significantly, long-term erosion resistance and stopping property can be guaranteed.Lock packing body not only in addition, the gland seal filler made from regard to this lock packing of logotype also quite is difficult for taking place the problem of shape collapse and so on, thereby can improve use properties.

Claims

1. lock packing, it has the body material that is shaped with expanded graphite and is coated on braiding on this substrate material surface or the strongthener of woollen yarn knitting, it is characterized in that above-mentioned body material uses rate of expansion at the expanded graphite more than 40 times, content of graphite is more than 90 weight %, and the density of body material is at 0.3g/cm ³More than.