JPH0652103B2 - Packing - Google Patents
PackingInfo
- Publication number
- JPH0652103B2 JPH0652103B2 JP2223395A JP22339590A JPH0652103B2 JP H0652103 B2 JPH0652103 B2 JP H0652103B2 JP 2223395 A JP2223395 A JP 2223395A JP 22339590 A JP22339590 A JP 22339590A JP H0652103 B2 JPH0652103 B2 JP H0652103B2
- Authority
- JP
- Japan
- Prior art keywords
- packing
- shaft
- tape
- expanded graphite
- sliding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000012856 packing Methods 0.000 title claims description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910002804 graphite Inorganic materials 0.000 claims description 18
- 239000010439 graphite Substances 0.000 claims description 18
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 description 13
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 description 8
- 230000006866 deterioration Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000004804 winding Methods 0.000 description 6
- 239000011888 foil Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Sealing Devices (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、流体機器の軸封部に用いるグランドパッキン
などに好適なパッキンに関するものである。TECHNICAL FIELD The present invention relates to a packing suitable for a gland packing or the like used in a shaft sealing portion of a fluid device.
［従来の技術］ 従来、例えば流体機器の軸封部に用いるグランドパッキ
ンとして、テープ状のパッキン材料を渦巻き状または同
心円状に巻き重ねたのち、金型内で加圧してリング状に
成形するダイモールド式もしくはシート状のパッキン材
料をリング状に打ち抜いたのち、これを多数枚積層して
成形するラミネート式、または細幅に切断したテープを
網み糸として編組することによって紐状体に形成する編
組パッキンなどが知られている。[Prior Art] Conventionally, for example, as a gland packing used for a shaft sealing portion of a fluid device, a tape-shaped packing material is wound in a spiral or concentric shape, and then pressed in a mold to form a ring shape. Molded or sheet-shaped packing material is punched out in a ring shape, and then laminated to form a large number of laminated materials, or a tape cut into narrow width is braided as a braided thread to form a string-like body. Braided packing and the like are known.
［発明が解決しようとする課題］ しかし、上記した従来のパッキンにおいて、ダイモール
ド式によって製造されたパッキンでは、軸径の異なるも
のに使用できないので汎用性に乏しく、したがって、異
なる軸径に対応する多種類のパッキンをあらかじめ用意
しておかなくてはならない難点がある。[Problems to be Solved by the Invention] However, in the above-mentioned conventional packing, since the packing manufactured by the die mold method cannot be used for those having different shaft diameters, it is poor in versatility, and therefore corresponds to different shaft diameters. There is a drawback that many kinds of packing must be prepared in advance.
また、径方向に層状を呈する構成であるため、各層間に
おいて軸方向のすべりを生じやすいので、例えば軸とパ
ッキンボックスの間、軸とパッキン押えの間およびパッ
キンボックスとパッキン押えの間などの隙間にはみ出
し、体積減少による応力緩和を招いてシール性を低下さ
せ、流体の漏れ量を増大させる欠点につながる。In addition, since it has a layered structure in the radial direction, axial slippage is likely to occur between the layers, so for example gaps between the shaft and packing box, between the shaft and packing retainer, and between the packing box and packing retainer, etc. This may cause the protrusion of the resin and the stress relaxation due to the volume reduction, thus reducing the sealing property and increasing the amount of fluid leakage.
さらに、層間に例えば潤滑剤を含浸させた特性の異なる
テープ状の材料を配置して潤滑性を高めようとしても、
この材料を軸と摺接させるために内周面に露出させるこ
とができないので、高い潤滑性を確保できない。Furthermore, even if an attempt is made to improve lubricity by arranging tape-shaped materials with different characteristics impregnated with a lubricant between the layers,
Since this material cannot be exposed on the inner peripheral surface because it is in sliding contact with the shaft, high lubricity cannot be ensured.
また、ラミネート式によって製造されたパッキンは、軸
方向に層状を呈する構成であるため、ダイモールド式に
よって製造されたパッキンのような軸方向のすべりによ
って隙間にはみだす不都合を生じないので、体積減少に
よる応力緩和が回避され、したがって、シール性が低下
しない利点と、層間に配置した特性の異なる材料を軸と
摺接させるために内周面に露出させることができるの
で、高い潤滑性を確保できるなどの利点を有しているも
のの、ダイモールド式によって製造されたパッキンと同
様に、軸径の異なるものには使用できないので汎用性に
乏しく、したがって、異なる軸径に対応する多種類のパ
ッキンをあらかじめ用意しておかなくてはならない難点
があり、しかも軸に摺接する内周面（内周部）摩耗時の
追随性が悪く、これが経時的なシール破壊につながるな
どの問題点を有している。In addition, since the packing manufactured by the laminate type has a structure that is layered in the axial direction, there is no inconvenience of sticking out in the gap due to the axial sliding unlike the packing manufactured by the die mold type, and therefore the volume reduction is caused. Since stress relaxation is avoided and therefore the sealing performance does not deteriorate, materials with different characteristics placed between layers can be exposed on the inner peripheral surface for sliding contact with the shaft, so high lubricity can be secured, etc. However, as with the packing manufactured by the die-molding method, it cannot be used for products with different shaft diameters, so it lacks versatility. There are drawbacks that must be prepared, and the ability to follow when the inner peripheral surface (inner peripheral portion) that slides on the shaft is worn is poor. It has a problem such as leading to temporal seal failure.
さらに、編組パッキンは、軸経に合せて所定長さに切断
したのち、この切断されたものを軸外周に巻回して使用
することができるので、汎用性が向上する利点を有して
いるけれども、編組そのものが比較的煩雑で多工数を必
要とするから、生産性が悪い上に、引張り強さと靱性の
高い編み糸を使用しなければならないので、使用可能な
編み糸材料が大幅に制限される難点を有している。Furthermore, since the braided packing can be used after being cut into a predetermined length according to the shaft warp and wound around the shaft outer periphery, it has the advantage of improving versatility. Since the braiding itself is relatively complicated and requires a lot of man-hours, the productivity is poor and the knitting yarn having high tensile strength and toughness must be used. Have the drawbacks.
さらにまた、上述の各パッキンは、軸との摺動部におい
て発生する摺動熱の放熱機能が低く、熱劣化に伴なうシ
ール性の低下や、焼付きなどを招きやすい欠点を有して
いる。Furthermore, each of the above-mentioned packings has a drawback that the function of radiating the sliding heat generated in the sliding portion with the shaft is low, and the sealing property is deteriorated due to thermal deterioration, and seizure is likely to occur. There is.
本発明はこのような実情に鑑みてなされたもので、軸経
に合せての所定長さの切断および軸外周への巻回による
使用を可能にして汎用性の向上を図ることができるとと
もに、軸との間の摺接性能を向上して、軸方向のすべり
によって隙間にはみだす不都合をなくして、体積減少に
よる応力緩和およびこれに伴なうシール性の低下を防止
でき、また摩耗時の追随性を向上させて、経時的なシー
ル破壊を防止し、かつ生産性の向上を実現するととも
に、摺動熱の放熱機能を高めて熱劣化に伴なうシール性
の低下および焼付きなどの発生を確実に防止することが
できるパッキンを提供することを目的とする。The present invention has been made in view of such circumstances, and it is possible to improve versatility by enabling use by cutting a predetermined length according to the shaft warp and winding around the shaft outer periphery, Improves the sliding contact performance with the shaft, eliminates the inconvenience of protruding into the gap due to slip in the axial direction, prevents stress relaxation due to volume decrease and the accompanying deterioration of sealing performance, and also follows the wear. To improve sealability, prevent seal destruction over time, and improve productivity, and improve the heat dissipation function of sliding heat to cause deterioration of sealability and seizure due to thermal deterioration. An object of the present invention is to provide a packing that can reliably prevent
［課題を解決するための手段］ 上記目的を達成するために、本発明は、少なくとも一層
の膨張黒鉛テープを、厚さ方向に山折り、谷折りの繰り
返しでジグザグ状に折りたたんで紐状に形成し、このテ
ープの少なくとも被摺動面に補強被膜を形成したもので
ある。[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention folds at least one layer of expanded graphite tape in a zigzag shape by repeating mountain folds and valley folds in the thickness direction to form a string shape. However, a reinforcing coating is formed on at least the sliding surface of this tape.
［作用］ 本発明によれば、紐状体を軸経に合せて所定長さに切断
したのちに、軸方向を径内外に指向させるかまたは厚さ
方向、つまり山折り、谷折りの方向を径内外に指向させ
て軸外周に巻回して使用することができる。[Operation] According to the present invention, after the cord-like body is cut into a predetermined length in accordance with the axial length, the axial direction is directed radially inward or outward, or the thickness direction, that is, the direction of the mountain fold or the valley fold is changed. It can be used by winding it around the outer circumference of the shaft while directing it inside and outside the diameter.
紐状体は少なくとも一層の膨張黒鉛テープを、厚さ方向
に山折り、谷折りの繰り返しでジグザグ状に折りたたん
で形成されているので、幅方向を径内外に指向させるか
または厚さ方向を径内外に指向させて軸外周に巻回して
使用しても、パッキン自体に軸方向のすべりを生じない
ので、隙間にはみだすことがない。Since the cord-like body is formed by folding at least one layer of expanded graphite tape in a zigzag shape by repeating mountain folds and valley folds in the thickness direction, the width direction is directed inward and outward in the radial direction, or the thickness direction is changed in the radial direction. Even if the packing is used by being wound inward and outward and wound around the outer circumference of the shaft, the packing itself does not slip in the axial direction, so it does not protrude into the gap.
また、２層以上の膨張黒鉛テープを、厚さ方向に山折
り、谷折りの繰り返しでジグザグ状に折りたたむこと
で、層間に配置した特性の異なる材料と軸との摺接が可
能になる。Further, by folding the expanded graphite tape having two or more layers in a zigzag shape by repeating mountain folds and valley folds in the thickness direction, it becomes possible to make sliding contact between the materials arranged between the layers and having different characteristics and the shaft.
さらに、三次元的な折り曲げ形状で軸面に対応するの
で、摩耗時の追随性が向上する。Furthermore, since the three-dimensional bent shape corresponds to the shaft surface, the followability during wear is improved.
軸外周に巻回することで、折りたたまれて互いに対向し
ている面の対向間隔が径内部よりも径外部で大きくなる
から、径内部において発生する摺動熱の放熱機能が向上
する。By winding on the outer circumference of the shaft, the facing distance between the surfaces that are folded and face each other becomes larger on the outside of the inside than on the inside of the shaft, so that the heat dissipation function of the sliding heat generated inside the inside is improved.
とくに、上記膨張黒鉛テープの被摺動面に補強被膜を形
成したので、強度が増し、被摺動面の破損等が防止さ
れ、締め付け時のはみ出しも一層抑制される。In particular, since the reinforcing coating is formed on the sliding surface of the expanded graphite tape, the strength is increased, damage to the sliding surface is prevented, and the protrusion during tightening is further suppressed.
［実施例］ 以下、本発明の実施例を図面にもとづいて説明する。EXAMPLES Examples of the present invention will be described below with reference to the drawings.
第１図は本発明の第１実施例の一部を示す斜視図であ
り、同図において、パッキン１は、膨張黒鉛テープ２
（２Ａ，２Ｂ，２Ｃ）と、このテープ２の表面を覆う補
強被膜として、鎧巻きした低摩擦係数のテープ２０とか
らなる３枚重ね三層構造を、厚さ方向に山折り、谷折り
の繰り返しでジグザグ状に折りたたんで山折り部３Ａと
谷折り部３Ｂが形成されており、折りたたみ方向、つま
り厚さ方向に直交して加圧することで、く字状に曲げて
保形された紐状体４を構成している。FIG. 1 is a perspective view showing a part of a first embodiment of the present invention, in which packing 1 is an expanded graphite tape 2
(2A, 2B, 2C) and a three-layered three-layer structure consisting of a tape 20 having a low friction coefficient wrapped in armor as a reinforcing coating for covering the surface of the tape 2 is formed into a mountain fold and a valley fold in the thickness direction. By repeatedly folding in a zigzag shape, a mountain fold portion 3A and a valley fold portion 3B are formed, and by pressing in a direction orthogonal to the folding direction, that is, the thickness direction, it is bent in a V-shape and is shaped like a cord. It constitutes the body 4.
上記膨張黒鉛テープ２（２Ａ，２Ｂ，２Ｃ）は、厚さ0.
38mm、幅12.5mm、密度1.0g/cm3のものが使用されてお
り、前述の加圧によって密度1.38g/cm3に高められて保
形性を向上させている。The expanded graphite tape 2 (2A, 2B, 2C) has a thickness of 0.
It is 38 mm wide, 12.5 mm wide and has a density of 1.0 g / cm 3 , and the above pressurization increases the density to 1.38 g / cm 3 to improve shape retention.
上記補強用テープ２０は、上記膨張黒鉛テープ２よりも
引張り強度が高く、かつ低摩擦係数のものとして、たと
えばポリテトラフルオロエチレン（以下、ＰＴＦＥと略
称する）からなるテープが使用されている。The reinforcing tape 20 has a higher tensile strength than the expanded graphite tape 2 and has a low friction coefficient, for example, a tape made of polytetrafluoroethylene (hereinafter referred to as PTFE) is used.
このような構成であれば、紐状体４を、例えば第２図の
軸５の軸経に合せて所定長さに切断したのち、第３図の
ように、幅方向を径内外に指向させてリング状に曲成し
て軸５の外周に巻回することによって使用できるから、
異なる軸径に対応する多種類のパッキンをあらかじめ用
意しておく必要がなく、汎用性が向上する。With such a configuration, the string-like body 4 is cut into a predetermined length, for example, according to the axis of the shaft 5 in FIG. 2, and then the width direction is directed radially inward and outward as shown in FIG. Since it can be used by bending it into a ring shape and winding it around the outer periphery of the shaft 5,
It is not necessary to prepare many kinds of packings corresponding to different shaft diameters in advance, which improves versatility.
また、パッキン１の軸方向を径内外に指向させて軸５の
外周に巻回して使用しても、径方向に層が形成されない
ので、パッキン１の層間に軸方向のすべりを生じない。
そのために第２図の軸５とパッキンボックス６の間に形
成されている隙間７ａ、軸５とパッキン押え８の間に形
成されている隙間７ｂおよびパッキンボックス６とパッ
キン押え８の間に形成されている隙間７ｃなどにパッキ
ン１がはみださないので、体積減少にともなう応力緩和
が避けられ、シール性の低下を防止することができる。Further, even when the packing 1 is used by being wound around the outer circumference of the shaft 5 with the axial direction oriented inward and outward, a layer is not formed in the radial direction, so that no slippage in the axial direction occurs between the layers of the packing 1.
Therefore, a gap 7a formed between the shaft 5 and the packing box 6 in FIG. 2, a gap 7b formed between the shaft 5 and the packing retainer 8 and a space formed between the packing box 6 and the packing retainer 8 are formed. Since the packing 1 does not protrude into the open gap 7c or the like, the stress relaxation due to the volume decrease can be avoided, and the deterioration of the sealing property can be prevented.
そして、紐状体４は厚さ方向に山折り、谷折りの繰り返
しでジグザク状に折りたたまれ、かつ厚さ方向に直交し
て加圧してく字状に曲げられることで、三次元的な折り
曲げ形状で軸５の外周面に対応するので、摩耗時の追随
性が向上しシール面圧を低下させないから、経時的なシ
ール破壊を確実に防止できる。Then, the cord-like body 4 is folded in a zigzag shape by repeating mountain folds and valley folds in the thickness direction, and is bent in a dogleg shape by applying pressure perpendicular to the thickness direction, thereby forming a three-dimensional bent shape. Since it corresponds to the outer peripheral surface of the shaft 5, the followability at the time of wear is improved and the seal surface pressure is not reduced, so that it is possible to reliably prevent the seal from breaking over time.
ところで、上記パッキン１を膨張黒鉛テープ２だけで構
成した場合は、強度が十分高いと言えないので、せん断
による被摺動面の破損のおそれがある。さらに、摩擦抵
抗が比較的大きいので、締め付け時に僅かでもはみ出し
が起きると、摺動抵抗が増して、その部分の摩耗等が大
きくなり、これがシール性能に支障を来すことになる。By the way, when the packing 1 is composed of only the expanded graphite tape 2, the strength cannot be said to be sufficiently high, and therefore the sliding surface may be damaged by shearing. Further, since the frictional resistance is relatively large, even if a small amount of protrusion occurs at the time of tightening, the sliding resistance increases and the wear and the like of that part increases, which impairs the sealing performance.
この点につき、上記のものは、膨張黒鉛テープ２にＰＴ
ＦＥのテープ２０を鎧巻きにしてあるので、このテープ
４の補強作用で強度が増し、被摺動面の破損を防止する
ことができる。With respect to this point, the above-mentioned products have PT on the expanded graphite tape 2.
Since the FE tape 20 is wrapped in armor, the reinforcing action of the tape 4 increases the strength and prevents the sliding surface from being damaged.
さらに、上記ＰＴＦＥの摩擦係数が小さいので、締め付
け時にはみ出しが起きても摺動抵抗は大きくならず、摩
耗が抑制され、シール性も確実に保たれる。Further, since the PTFE has a small friction coefficient, the sliding resistance does not increase even if protrusion occurs during tightening, wear is suppressed, and sealing performance is also reliably maintained.
第４図は本発明の第２実施例を示し、３層構造の膨張黒
鉛テープ２Ａ，２Ｂ，２Ｃのうちの上下の２層の膨張黒
鉛テープ２Ａ，２ＣのみにＰＦＥのテープ２０を鎧巻き
した後、前述と同様に厚さ方向へ山折り、谷折りの繰り
返してジグザグ状に折りたたんだものである。この場合
も、紐状体４を形成し、これを第２図の軸５の軸経に合
せて所定長さに切断したのち、第３図のように、幅方向
を径内外に指向させてリング状に曲成して軸５の外周に
巻回することによって使用できるから、第１実施例と同
様の作用効果を奏するうえ、構造も簡素になる。FIG. 4 shows a second embodiment of the present invention. Of the three-layer expanded graphite tapes 2A, 2B, 2C, only the upper and lower two layers of expanded graphite tapes 2A, 2C are wrapped with the PFE tape 20. After that, like the above, it is folded in a zigzag shape by repeating mountain folds and valley folds in the thickness direction. In this case as well, the string-like body 4 is formed, cut into a predetermined length in accordance with the axis of the shaft 5 in FIG. 2, and then, as shown in FIG. Since it can be used by being bent in a ring shape and wound around the outer periphery of the shaft 5, the same operational effect as that of the first embodiment is obtained and the structure is simplified.
第５図は本発明の第３実施例を示し、３層構造の膨張黒
鉛テープ２Ａ，２Ｂ，２Ｃの幅方向の各一端にそれぞれ
ＰＴＦＥのテープ２０を２つ折りにしてはさみ込んだ
後、前述と同様に厚さ方向へ山折り、谷折りの繰り返し
でジグザグ状に折りたたんだものである。この場合も、
前述実施例と同様の効果を奏するうえ、ＰＴＦＥのテー
プ２０を鎧巻きするものよりも加工の手間が省ける。し
かも、このテープ２０の無駄な使用が排除される。FIG. 5 shows a third embodiment of the present invention, in which the PTFE tape 20 is folded in two at each end of each of the expansive graphite tapes 2A, 2B and 2C having a three-layer structure in the width direction, and then the above-mentioned procedure is performed. Similarly, it is folded in a zigzag shape by repeating mountain folds and valley folds in the thickness direction. Also in this case,
In addition to the effects similar to those of the above-described embodiment, the labor of processing is reduced as compared with the case where the PTFE tape 20 is wrapped in armor. Moreover, useless use of the tape 20 is eliminated.
ところで、上記膨張黒鉛テープ２に形成される補強被膜
としては、上記ＰＴＦＥのテープ２０に限られるもので
はなく、金属箔、たとえばアルミ箔、銅箔、ステンレス
箔を用いてもよく、この場合は、強度が増強されるう
え、酸化防止の効果も大きい。By the way, the reinforcing coating formed on the expanded graphite tape 2 is not limited to the PTFE tape 20, but a metal foil such as an aluminum foil, a copper foil, or a stainless steel foil may be used. In addition to strengthening strength, it is also highly effective in preventing oxidation.
上記第１図、第４図および第５図に示すものをそれぞれ
実施例１、実施例２および実施例３とし、また実施例１
のＰＴＦＥテープに代えてアルミ箔を使用したものを実
施例４とし、実施例３のもののＰＴＦＥテープに代えて
アルミ箔を用いたものを実施例５として、それぞれの特
性を測定した結果を第６図に表として示す。The examples shown in FIGS. 1, 4 and 5 are referred to as Example 1, Example 2 and Example 3, respectively.
Example 4 was a case where an aluminum foil was used instead of the PTFE tape of Example 3, and Example 5 was an example where an aluminum foil was used instead of the PTFE tape of Example 3, and the results of measuring the respective characteristics were the sixth. Shown as a table in the figure.
第６図の表において、締め付け時の「はみ出し防止」に
ついては、所定の大きさのものに400kg/cm2の加圧力を
加えた時の軸方向のはみ出長を測定し、0.5mm未満を
◎、0.5mm以上で1.0mm未満のものを○、1mm以上で2.0mm
未満のものを△、2mm以上のものを×としたものであ
る。In the table of Fig. 6, for "prevention of protrusion" at the time of tightening, measure the axial protrusion length when applying a pressure of 400 kg / cm 2 to a specified size, and measure less than 0.5 mm. , 0.5 mm or more and less than 1.0 mm ○, 1 mm or more 2.0 mm
Those with less than 2 are marked with Δ, and those with 2 mm or more are marked with x.
摺動抵抗については、所定数のパッキン１のリングを40
0kg/cm2で軸５に締め付け、軸５の回転トルクから換算
した次式のパッキン摺動抵抗係数Ｋを用いた。For sliding resistance, use the ring of packing 1
It was fastened to the shaft 5 at 0 kg / cm 2 , and the packing sliding resistance coefficient K of the following formula converted from the rotation torque of the shaft 5 was used.
ただし、Ｔｓ：弁棒トルク(kgf・cm) ｄ：弁棒径(cm) Ｌ：パッキン接触長さ(cm) Ｐｇ：締付圧力(kgf/cm2) そして、パッキン摺動抵抗係数Ｋが０．０４未満であれ
ば◎、０．０４以上で０．０５未満のものを○、０．０
５以上で０．０６未満のものを△、０．０６以上のもの
を×としたものである。 However, Ts: valve stem torque (kgf · cm) d: valve stem diameter (cm) L: packing contact length (cm) Pg: tightening pressure (kgf / cm 2 ) and packing sliding resistance coefficient K is 0 If it is less than 0.04, it is ◎, and if it is 0.04 or more and less than 0.05, it is ◯, 0.0.
Those with 5 or more and less than 0.06 are marked with Δ, and those with 0.06 or more are marked with x.
耐熱性については、所定数のパッキン１のリングを400k
g/cm2で締め付け、300℃，１０Ｈｒ加圧後、常温まで冷
却し、Ｎ２ガスの漏れ量変化を測定したもので、漏れが
零もしくは変化がないものを◎、漏れ増加率が２倍未満
であれば○、漏れ増加率が２倍以上で１０倍未満のもの
を△、漏れ増加率が１０倍以上のものを×としている。Regarding heat resistance, a ring of packing 1
Tighten at g / cm 2 , pressurize at 300 ° C for 10 hours, cool to room temperature, and measure the change in the amount of leakage of N2 gas. If the leakage is zero or does not change, the leakage rate is less than double. If so, the case where the increase rate of leakage is 2 times or more and less than 10 times is indicated as Δ, and the case where the increase rate of leakage is 10 times or more is indicated as x.
シール性については、所定数のパッキン１の装着状態に
おいて、21kg/cm2のＮ２ガスの締付時（締付圧400kg/cm
2）の漏れを測定し、漏れが零を維持可能な締付圧300kg
/cm2未満のものを◎、漏れが零を維持可能な締付圧300k
g/cm2以上で400kg/cm2未満のものが○、締付圧400kg/cm
2の漏れが10cc/min未満のものを△、締付圧400kg/cm2の
漏れが10cc/min以上のものを×としている。Regarding the sealing property, with a specified number of packings 1 attached, when tightening 21 kg / cm 2 N 2 gas (tightening pressure 400 kg / cm
2 ) Leakage is measured, and the tightening pressure that can maintain zero leakage is 300 kg.
Less than / cm 2 ◎, tightening pressure 300k that can maintain zero leakage
○ g / cm 2 or more and less than 400 kg / cm 2 , tightening pressure 400 kg / cm
2 is less than 10 cc / min and Δ is for tightening pressure of 400 kg / cm 2 and 10 cc / min or more is for leakage.
耐酸化については、１Ｈｒの加熱において重量が５％減
少する時の温度を測定し、400℃以上のものは◎、400℃
未満で300℃以上のものを○、300℃未満で200℃以上の
ものを△、200℃未満のものを×としている。For oxidation resistance, measure the temperature when the weight decreases by 5% when heated at 1 hr.
If the temperature is less than 300 ° C, the temperature is less than 300 ° C.
非汚染性については、5mm×1000サイクル往復時の軸表
面への移行ならびの摩耗粉の発生を観測し、軸表面への
移行、摩耗粉のないものを◎、軸表面に僅かに移行する
もの○、摩耗粉の発生したもの△、摩耗によるパッキン
重量減少が５％以上のものを×とした。Regarding non-staining property, we observed the generation of wear powder as well as migration to the shaft surface during reciprocation of 5 mm x 1000 cycles, migration to the shaft surface, no wear powder ◎, slight migration to the shaft surface ◯, abrasion powder was generated Δ, and packing weight loss due to abrasion was 5% or more was evaluated as x.
［発明の効果］ 本発明は、上述のように構成されているので、つぎに記
載する効果を奏する。[Advantages of the Invention] Since the present invention is configured as described above, it has the effects described below.
本発明のパッキンにおいては、紐状体を軸径に合わせて
切断したのちに、軸方向を径内外に指向させるかまたは
厚さ方向、つまり山折り、谷折りの方向を径内外に指向
させて軸外周に巻回して使用することができるので、汎
用性が向上する。In the packing of the present invention, after cutting the string-like body according to the shaft diameter, the axial direction is directed inward and outward, or the thickness direction, that is, the direction of mountain fold and valley fold is directed inward and outward. Since it can be wound around the outer circumference of the shaft for use, versatility is improved.
また、紐状体は少なくとも一層の膨張黒鉛テープを、厚
さ方向に山折り、谷折りの繰り返しでジグザグ状に折り
たたんで形成されているので、幅方向を径内外に指向さ
せるかまたは厚さ方向を径内外に指向させて軸外周に巻
回して使用しても、パッキン自体に軸方向のすべりを生
じないので隙間にはみださないから、体積減少にともな
う応力緩和が避けられ、シール性の低下を防止すること
ができる。Further, since the cord-like body is formed by folding at least one layer of the expanded graphite tape in a zigzag shape by repeating mountain folds and valley folds in the thickness direction, the width direction is directed inward and outward in the radial direction or the thickness direction. Even if it is used by wrapping it around the inner and outer diameters and winding it around the shaft outer circumference, the packing itself does not slip in the axial direction, so it does not protrude into the gap, so stress relaxation due to volume reduction is avoided and sealing performance is improved. Can be prevented.
そして、２層以上の膨張黒鉛テープを厚さ方向に山折
り、谷折りの繰り返しでジグザグ状に折りたたむこと
で、層間に配置した特性の異なる材料と軸との摺接が可
能になるので少量の油含有により潤滑性能を向上させる
ことができる。By folding the expanded graphite tape of two layers or more in the thickness direction in a zigzag shape by repeating mountain folds and valley folds, it is possible to make sliding contact between the materials arranged between the layers with different characteristics and the shaft. Lubrication performance can be improved by containing oil.
また、三次元的な折り曲げ形状で軸面に対応するので、
摩耗時の追随性が向上するからシール面圧を低下させな
いため、経時的なシール破壊を確実に防止できる。Also, because it corresponds to the axial surface with a three-dimensional bent shape,
Since the followability at the time of wear is improved and the seal surface pressure is not reduced, it is possible to reliably prevent the seal from breaking over time.
さらに、軸外周に巻回することで、折りたたまれて互い
に対向している面の対向間隔が径内部よりも径外部で大
きくなるから、径内部において発生する摺動熱の放熱機
能が向上し、熱劣化に伴なうシール性の低下および焼付
きなどの発生を確実に防止することができる。Further, by winding around the outer circumference of the shaft, the facing distance between the surfaces that are folded and face each other becomes larger on the outside of the diameter than on the inside of the diameter, so that the heat dissipation function of sliding heat generated inside the diameter is improved, It is possible to reliably prevent the deterioration of the sealing property and the occurrence of seizure due to the heat deterioration.
とくに、上記膨張黒鉛テープの少なくとも被摺動面にＰ
ＴＦＥ等の補強被膜を形成したものは、強度が強化さ
れ、しかも摺動抵抗が小さくなって摩耗が抑制され、長
期に亘ってシール性を良好に維持することができるとい
う効果を奏する。In particular, at least the sliding surface of the expanded graphite tape has P
Those having a reinforcing coating such as TFE have the effects that the strength is enhanced, the sliding resistance is reduced, wear is suppressed, and good sealing performance can be maintained over a long period of time.
第１図は本発明の実施例を示し、第１図は第１実施例の
部分斜視図、第２図は使用例の説明断面図、第３図は第
１実施例の紐状体を所定長さに切断してリング状に曲げ
た状態を示す部分斜視図、第４図は第２実施例の部分斜
視図、第５図は第２実施例の部分斜視図、第６図は各実
施例および比較例の特性を測定した結果を示す表であ
る。 ２（２Ａ，２Ｂ，２Ｃ）……膨張黒鉛テープ、３Ａ……
山折り部、３Ｂ……谷折り部、４……紐状体、２０……
補強被膜。FIG. 1 shows an embodiment of the present invention, FIG. 1 is a partial perspective view of the first embodiment, FIG. 2 is an explanatory sectional view of a usage example, and FIG. 3 is a string-like body of the first embodiment. FIG. 4 is a partial perspective view of the second embodiment, FIG. 4 is a partial perspective view of the second embodiment, and FIG. 6 is each embodiment. It is a table which shows the result of having measured the characteristic of an example and a comparative example. 2 (2A, 2B, 2C) ... Expanded graphite tape, 3A ...
Mountain fold, 3B ... Valley fold, 4 ... String-like body, 20 ...
Reinforcement coating.
Claims (1)
方向に山折り、谷折りの繰り返しでジグザグ状に折りた
たんで紐状に形成し、このテープの少なくとも被摺動面
に補強被膜を形成したことを特徴とするパッキン。1. An expanded graphite tape of at least one layer is folded in a zigzag shape by repeating mountain folds and valley folds in the thickness direction to form a string, and a reinforcing coating is formed on at least a sliding surface of the tape. Packing characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2223395A JPH0652103B2 (en) | 1990-08-24 | 1990-08-24 | Packing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2223395A JPH0652103B2 (en) | 1990-08-24 | 1990-08-24 | Packing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04107363A JPH04107363A (en) | 1992-04-08 |
| JPH0652103B2 true JPH0652103B2 (en) | 1994-07-06 |
Family
ID=16797476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2223395A Expired - Fee Related JPH0652103B2 (en) | 1990-08-24 | 1990-08-24 | Packing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0652103B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4126397B2 (en) * | 2000-05-16 | 2008-07-30 | 株式会社明電舎 | Rotary heat treatment equipment |
-
1990
- 1990-08-24 JP JP2223395A patent/JPH0652103B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04107363A (en) | 1992-04-08 |
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