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Gland packing

A gland and fiber technology, applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of brittleness and easy folding, low tensile strength, etc., and achieve the effect of reducing friction coefficient and small friction

Active Publication Date: 2015-03-18
NIPPON PILLAR PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although expanded graphite has the advantages of flexibility, excellent chemical resistance, sufficient adhesion and high temperature resistance, it also has the disadvantages of very low tensile strength, brittleness and easy breakage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0045] The gland packing of the present invention is characterized in that it is formed by twisting or weaving one or more yarns obtained by twisting fibers with an LOI of 21 to 30, and the fiber s contains flatness f defined as For fibers of 1.1 to 4, the flatness f is obtained by dividing the maximum value a of the interval between the two straight lines L1, L2 between the two parallel straight lines L1, L2 in the state where the cross section of the fiber is sandwiched. The value obtained with the minimum value of b.

[0046] In Embodiment 1, the value e of the LOI of the fiber is 21≤e≤30, and the flatness f is 1.1≤f≤4.

[0047] First, the fiber whose LOI value e is 21≦e≦30 may, for example, be acrylic fiber, acrylic fiber, viscose, cellulose, hemp, cotton or polyvinyl alcohol.

[0048] Acrylic fibers include fibers made of polymers containing 50% by weight or more of acrylonitrile. When the polymer contains 50% by weight or more of acrylonitrile, the polymer may be a cop...

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Abstract

A gland packing having required characteristics is obtained by finding relationships between required characteristics and the value of the limiting oxygen index, and adequately defining the level of the required characteristics. The gland packing is configured by twisting or braiding a single or plurality of yarns that are formed by twisting fibers having a limiting oxygen index (LOI) of 21 to 30, preferably 22 to 26. The fibers contain fibers in which a flat ratio is defined as 1.1 to 4, the flat ratio being a value which is obtained by dividing the maximum value of an interval between two parallel straight lines in a state where a section of each of the fibers is interposed between the straight lines, by the minimum value. The fibers contain fibers in each of which a sectional shape has one or more recesses having a depth of 0.4 μm or more.

Description

technical field [0001] The present invention relates to a gland packing used as a sealing member of a fluid device such as a pump or a valve. Background technique [0002] As the prior art of gland packings used for shaft seals of fluid devices such as pumps and valves, and yarns (braided threads) used for the gland packings, techniques using expanded graphite as disclosed in Patent Document 1 are generally known. . Although expanded graphite has the advantages of flexibility, excellent chemical resistance, sufficient adhesiveness, and high temperature resistance, it also has the disadvantages of very low tensile strength, brittleness, and brittleness. [0003] Therefore, the gland packing is constituted by yarns made of fibers with high strength and high abrasion performance, or by twisting or weaving the yarns into a tape shape. For example, a technique using an acrylic fiber disclosed in Patent Document 2 or Patent Document 3 is known. As these organic fibers, various ...

Claims

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Application Information

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IPC IPC(8): F16J15/22
CPCF16J15/181F16J15/22
Inventor 川崎贵士林洋树片冈幸一
Owner NIPPON PILLAR PACKING CO LTD
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