WO2016129574A1 - Mechanical seal - Google Patents

Mechanical seal Download PDF

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Publication number
WO2016129574A1
WO2016129574A1 PCT/JP2016/053733 JP2016053733W WO2016129574A1 WO 2016129574 A1 WO2016129574 A1 WO 2016129574A1 JP 2016053733 W JP2016053733 W JP 2016053733W WO 2016129574 A1 WO2016129574 A1 WO 2016129574A1
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Prior art keywords
stationary ring
ring
mechanical seal
stationary
rotating
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PCT/JP2016/053733
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French (fr)
Japanese (ja)
Inventor
清隆 藤平
さおり 鬼束
佐々木　純
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株式会社タンケンシールセーコウ
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Publication of WO2016129574A1 publication Critical patent/WO2016129574A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member

Definitions

  • the present invention relates to a mechanical seal, and more particularly, to a hydrostatic non-contact mechanical seal using a porous member.
  • a mechanical seal is used as a mechanical element that seals leakage from a rotating part of a mechanical device such as around a rotating shaft such as a pump.
  • a rotating ring fixed on the rotating shaft side is brought into sliding contact with a stationary ring fixed on the stationary side of the pump body, etc. (Fluid) is sealed.
  • Frictional wear and frictional heat are generated on the sliding surface between the rotating ring and the fixed ring by sliding contact.
  • the liquid that is the sealing fluid flows into the sliding surface and lubricates and cools in this part.
  • the sealing fluid is a gas
  • lubrication and cooling with the sealing fluid is performed. Therefore, wear, heat generation, and sliding noise are generated in the sliding portion.
  • the conventional static pressure type non-contact mechanical seal as described above has a large gap due to an increase in the amount of fluid such as barrier gas, and the fluid film pressure distribution due to the fluid such as barrier gas is not uniform. Therefore, there is a problem that high sealing performance cannot be obtained.
  • the present invention has been made in view of these points, and an object of the present invention is to provide a mechanical seal that can obtain high sealing performance, is inexpensive, and can be easily manufactured.
  • a mechanical seal A rotating ring fixed to the rotating shaft; A stationary ring connected to the machine body side member through which the rotating shaft passes and disposed opposite to the rotating ring, wherein at least a part of the surface of the stationary ring facing the rotating ring is formed of a porous member.
  • a stationary ring Means for supplying a pressurized barrier fluid to the porous member, A mechanical seal is provided.
  • the surface of the stationary ring facing the rotating ring that is, at least a part of the stationary-side sealed end surface is configured by the porous member, and the pressurized barrier fluid is supplied to the porous member.
  • the pressurized barrier fluid flows out from the sealed end surface on the stationary side through the porous member, a fluid film is formed by the barrier fluid between the sealed end surface on the rotating side, and the distance between the sealed end surfaces is increased. Maintained and sealed between the sealed end faces. In this way, a fluid film can be formed by the barrier fluid between the sealed end faces without using a complicated mechanism.
  • the pressurized barrier fluid flows out from the sealed end surface on the stationary side, a uniform fluid film can be formed.
  • the entire surface of the stationary ring facing the rotating ring is composed of a porous member.
  • the stationary ring is composed of a porous member;
  • the stationary ring is fitted to the upper part of the concave portion of the stationary ring back metal having an annular concave portion,
  • the barrier fluid is supplied to the lower space of the concave portion of the stationary ring back metal.
  • the stationary end sealing end surface since the barrier fluid is supplied to the entire surface located on the opposite side of the surface facing the rotating ring (the stationary end sealing end surface), the stationary end sealing end surface It is possible to make the barrier fluid flow out from the entirety, and to form a more uniform fluid film.
  • a plurality of locations on the surface of the stationary ring facing the rotating ring is composed of a porous member,
  • the porous members are arranged at substantially equal intervals in the circumferential direction on the surface of the stationary ring facing the rotating ring.
  • the pressurized barrier fluid flows out from a position at a constant interval on the stationary end surface of the stationary side, so that a more uniform fluid film can be formed.
  • the porous member is disposed so as to extend over the entire circumference of the surface of the stationary ring facing the rotating ring.
  • the barrier fluid pressurized uniformly in the circumferential direction on the stationary end surface on the stationary side flows out, so that a more uniform fluid film can be formed.
  • FIG. 1 shows the principal part of the mechanical seal of the modification of the mechanical seal of a 1st embodiment.
  • FIG. 1 shows the principal part of the mechanical seal of the modification of the mechanical seal of a 1st embodiment.
  • FIG. 1 shows the principal part of the mechanical seal of the modification of the mechanical seal of a 1st embodiment.
  • FIG. 2 shows the structure of the stationary ring vicinity of the modification of the mechanical seal of 2nd Embodiment.
  • FIG. 1 is a schematic cross-sectional view showing a main part of a mechanical seal according to a first embodiment of the present invention.
  • the mechanical seal 1 of the present embodiment includes a cylindrical sleeve 2 fixed to a rotary shaft S such as a pump by a bolt (not shown).
  • a thick flange-like rising portion 2a extending outward in the radial direction is formed at the inner end of the sleeve 2 shown on the left side in FIG.
  • An annular groove 2b extending in the circumferential direction is formed at the radially inner end in the axial center of the rising portion 2a.
  • An O-ring 4 is disposed in the annular groove 2b, and the rotation shaft S and the sleeve 2 are connected to each other. A seal is formed between them.
  • a rotating ring 8 is disposed on the outer side (atmosphere side) in the axial direction of the rising portion 2 a of the sleeve 2 via an annular rotating ring back metal 6.
  • the rotating ring back metal 6 is a member that supports the rotating ring 8, and includes a main body portion 6a that extends in the axial direction, and a hanging portion 6b that extends radially inward from a substantially central position in the axial direction of the main body portion 6a. ing.
  • the rotating ring back metal 6 has an inner end of the main body portion 6 a that abuts against a radially outer end of the rising portion 2 a of the sleeve 2, and a hanging portion 6 b that rises of the sleeve 2. It arrange
  • An annular groove 2 c is formed at the radially outer end of the rising portion 2 a of the sleeve 2, and an O-ring 10 is disposed in the annular groove 2 c, and between the sleeve 2 and the rotating ring back metal 6. A seal is formed.
  • a concave portion 2d extending in the axial direction is formed on the atmospheric side surface of the rising portion 2a of the sleeve 2, and a spring 12 whose tip presses the suspended portion 6b of the rotating ring back metal 6 toward the atmospheric side in the concave portion 2d. Is accommodated, and the rotating ring back metal 6 is urged toward the rotating ring 8.
  • the rotary ring 8 is a member that forms a rotary seal with the fixed ring 14, and is formed of cemented carbide in the mechanical seal 1 of the present embodiment.
  • the stationary ring 14 is formed of porous carbon having air permeability.
  • An annular stationary ring back metal 16 is disposed on the atmosphere side of the stationary ring 14 and supports the stationary ring 14 from the atmosphere side.
  • the rotating ring 8 includes an atmospheric side surface 8 a that faces the in-machine side surface 14 a of the stationary ring 14.
  • the atmospheric side surface 8a of the rotating ring 8 serves as a sealing end surface on the rotating side
  • the in-machine side surface 14a of the stationary ring 14 serves as a sealing end surface on the stationary side.
  • the stationary ring back metal 16 is connected to the casing 18 on the radially outer side.
  • the casing 18 has a substantially L-shaped cross-sectional shape, and is disposed on the radially outer side and the atmosphere side of the stationary ring back metal 16.
  • Two O-rings 20 and 22 are disposed between the stationary ring back metal 16 and the casing 18 to form a seal.
  • An annular machine casing 24 is disposed inside the casing 18.
  • the mechanical seal 1 of the present embodiment is attached to a gas side member such as a pump and a tank by a bolt 26 penetrating the casing 18, the in-machine casing 24, a nut 28, and the like.
  • a set collar 30 is attached to the end portion of the sleeve 2 on the atmosphere side by a set screw 32.
  • Barrier gas supply passages 16a and 18a are formed in the stationary ring back metal 16 and the casing 18, respectively.
  • the barrier gas supply passage 16a of the stationary ring back metal 16 and the barrier gas supply passage 18a of the casing 18 are connected to each other, and are disposed outside the mechanical seal 1 to supply pressurized barrier gas from a barrier gas supply device (not shown) to the stationary ring 14. It is configured so that it can be led (supplied).
  • FIG. 2 is an exploded perspective view of the fixed ring 14 and the fixed ring back metal 16 of the mechanical seal 1 of the present embodiment
  • FIG. 3 is a longitudinal sectional view of the fixed ring 14 and the fixed ring back metal 16.
  • the stationary ring back metal 16 formed of alloy steel such as SUS is a thick annular material, and is an annular recess that opens toward the surface on one side in the axial direction. 34 is formed.
  • the annular recess 34 includes a wide section 34a having a rectangular cross section on the opening end side (upper side) and a narrow section 34b having a rectangular cross section provided integrally with the bottom of the wide section 34a.
  • the wide portion 34a has a cross-sectional shape that is substantially the same as the cross section of the stationary ring 14.
  • the wide portion 34a is fitted in a state in which the surface on one side in the axial direction where the stationary ring 14 serves as a sealing end surface protrudes. Yes.
  • the fixed ring 14 is attached and fixed to the wide portion 34a by sintering adhesion or the like so that the space between the fixed ring 14 and the side wall of the wide portion 34a is airtight.
  • the barrier gas supply passage 16a of the stationary ring back metal 16 is communicated with the narrow portion 34b.
  • the upper portion of the annular recess 34 on the open end side is closed by the stationary ring 14, and an annular sealed space is formed below the stationary ring 14 by the narrow portion 34 b. Further, in the annular sealed space formed by the narrow portion 34b, that is, in the annular sealed space located on the back side of the stationary ring 14, the barrier gas supply passage 16a of the stationary ring back metal 16 and the barrier gas supply passage 18a of the casing 18 are interposed. As indicated by arrows A and B, pressurized barrier gas is supplied from an external barrier gas supply device (not shown).
  • the stationary ring 14 is made of porous carbon having air permeability, when pressurized barrier gas is supplied into the annular sealed space 34b existing on the back side (atmosphere side).
  • the pressurized barrier gas passes through the stationary ring 14 as indicated by an arrow C, and is ejected from the machine inner side surface (static end surface on the stationary side) 14a of the stationary ring 14.
  • the pressurized barrier gas flows between the atmospheric side surface 8 a of the rotating ring 8 and the in-machine side surface 14 a of the stationary ring 14, and the rotating ring 8 and the rotating ring back metal 6 resist the urging force of the spring 12.
  • a fluid film M having a thickness of several ⁇ m is formed by the pressurized barrier gas between the atmospheric side surface (rotational side sealing end surface) 8a of the rotating ring 8 and the in-machine side surface (stationary sealing end surface) 14a of the stationary ring 14.
  • This fluid film M a seal is formed between the atmospheric side surface 8 a of the rotating ring 8 and the in-machine side surface 14 a of the stationary ring 14.
  • pressurized barrier gas nitrogen gas, argon gas, etc. are appropriately selected according to the use in addition to air. Further, instead of the pressurized barrier gas, other pressurized fluids such as water and oil can be used.
  • a certain force of the pressurized barrier gas or other pressurized fluid is adjusted to a pressure at which a desired seal can be formed between the rotating ring and the stationary ring in consideration of various conditions such as the pressure difference between the inside of the machine and the atmosphere. Is set.
  • the pressurized barrier gas can be ejected substantially uniformly from the entire in-machine side surface 14a of the stationary ring 14 facing the rotating ring 8, the atmospheric side surface 8a of the rotating ring 8 and the stationary ring 14 It becomes easy to maintain the pressure of the fluid film M between the in-machine side surface 14a in a high state.
  • the film thickness is made uniform, that is, the distance between the air side surface 8a of the rotating ring 8 and the in-machine side surface 14a of the stationary ring 14 is minimized.
  • porous carbon having a high self-lubricating property is used as the material of the stationary ring 14, even if the stationary ring 14 contacts the rotating ring 8 for some reason, problems such as galling are unlikely to occur.
  • FIG. 4 is a schematic cross-sectional view similar to FIG. 1, showing the main part of a mechanical seal 1 'of a modified example of the mechanical seal of the first embodiment.
  • the basic structure of the mechanical seal 1 ′ of the modification is the same as that of the mechanical seal 1 of the first embodiment.
  • the main difference from the mechanical seal 1 is that the casing is divided in the axial direction, and the spring 12 ′ accommodated in the first casing 18 ′ arranged on the atmosphere side attaches the stationary ring back metal 16 to the inside of the machine. This is the point.
  • the barrier gas supply passage 18a of the casing is formed in the second casing 18 "inside the machine.
  • FIG. 5 to FIG. 7 are cross-sectional views showing the configuration in the vicinity of the stationary ring of the mechanical seal of the second embodiment of the present invention and the mechanical seal of a modification thereof.
  • the mechanical seal 1 according to the first embodiment has a configuration in which the porous carbon stationary ring 14 is accommodated in the metal stationary ring back metal 16.
  • the stationary ring back metal 16 and the stationary ring member 42 corresponding to the stationary ring 14 of the mechanical seal 1 are integrally formed of porous carbon.
  • a barrier gas supply passage 42a communicating with the barrier gas supply passage 18a of the casing 18 is formed in the radially outer portion of the fixed ring member 42 so that the pressurized barrier gas can be introduced into the fixed ring member 42.
  • the fixed ring member 42 is provided with an annular inner side surface 42b that faces the rotating ring and forms a stationary end face on the stationary side.
  • the inner surface of the barrier gas supply passage 42a and the entire outer peripheral surface excluding the in-machine side surface 42b are clogged with resin indicated by a one-dot chain line and supplied to the barrier gas supply passage 42a.
  • the pressurized barrier gas is configured to be ejected from only the inner side surface 42b.
  • the barrier gas supply passage 42a is formed in the radially outer portion of the stationary ring member 42.
  • the configuration may be such that the barrier gas supply passage 42 a ′ extends to the radially inner portion of the stationary ring member 42.
  • the pressurized barrier gas can be more uniformly ejected from the entire inner side surface 42b.
  • the barrier gas supply passage is not provided in the stationary ring member 42 ′′, and the barrier gas does not clog the radial outer surface of the stationary ring member 42 ′′.
  • An introduction portion 44 may be provided, and a barrier gas supply passage 18 a of the casing 18 may be connected to the barrier gas introduction portion 44.
  • the entire surface of the stationary ring (sealed end surface) facing the rotating ring is formed of porous carbon.
  • the present invention is a plan view of the stationary ring of FIGS. As shown, at least a part of the sealed end face may be formed of a porous member such as porous carbon.
  • a configuration in which a plurality of porous portions are arranged at equal intervals or at equal intervals over the entire circumference of the annular sealing end surface may be employed.
  • a plurality of circular porous portions 54 are arranged at equal intervals in the center position in the width direction of the annular sealing end surface 52.
  • a plurality of curved oval porous portions 64 are arranged at equal intervals at the center position in the width direction of the annular sealing end surface 62.
  • annular porous portion 74 having a width narrower than the width of the sealing end surface 72 is disposed at the center in the width direction of the annular sealing end surface 72.
  • a hexagonal annular porous portion 84 having a width narrower than the width of the sealing end surface 82 is disposed in the center of the annular sealing end surface 82 in the width direction.
  • the porous portions 54, 64, 74, and 84 are disposed on the sealing end surfaces (surfaces of the stationary ring facing the rotating ring) 52, 62, 72, and 82 of the stationary ring. It is embedded so as to be flush with the sealing end surface.
  • a pressurized barrier fluid such as a pressurized barrier gas is introduced into the back side of the porous portions 54, 64, 74 and 84, and the barrier fluid pressurized from the surface of the porous portions 54, 64, 74 and 84 is introduced. Are ejected to form a fluid film.
  • the stationary ring is formed of porous carbon.
  • the stationary ring may be formed of another porous body through which fluid can flow, for example, sintered metal, porous resin, or the like. .
  • the stationary ring back metal 16 is formed with alloy steel, such as SUS, it is formed with other materials which do not permeate

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Sealing (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

　The purpose of the present invention is to provide a mechanical seal with which it is possible to obtain excellent sealing properties, and which is inexpensive and easy to produce. According to the present invention, a mechanical seal (1) is characterized by being provided with a rotating ring (8) which is fixed to a rotating shaft, and a fixed ring (14) which is positioned facing the rotating ring and which is connected to an apparatus-side member through which the rotating shaft passes, and which has at least part of the surface of the fixed ring which faces the rotating ring made from a porous member; and means (16a, 18a, 34b) for supplying a pressurized barrier fluid to the porous member.

Description

メカニカルシールmechanical seal
　本発明は、メカニカルシールに関し、より詳細には、多孔質部材を用いた静圧形非接触式メカニカルシールに関する。 The present invention relates to a mechanical seal, and more particularly, to a hydrostatic non-contact mechanical seal using a porous member.
　ポンプ等の回転軸回り等の機械装置の回転部分からの漏れを封じる機械要素としてメカニカルシールが使用される。メカニカルシールでは、回転軸側に固定された回転側の回転環と、ポンプ本体等の静止側に固定された静止側の固定環とを摺動接触させ、回転部分の周囲に存在する流体(シール流体)のシールを行っている。 A mechanical seal is used as a mechanical element that seals leakage from a rotating part of a mechanical device such as around a rotating shaft such as a pump. In the mechanical seal, a rotating ring fixed on the rotating shaft side is brought into sliding contact with a stationary ring fixed on the stationary side of the pump body, etc. (Fluid) is sealed.
　摺動接触によって回転環と固定環の間の摺動面には摩擦摩耗、摩擦熱が発生する。液体をシールするメカニカルシールでは、シール流体である液体が摺動面に流入し、この部分で潤滑、冷却を行うが、シール流体が気体等である場合には、シール流体による潤滑、冷却が行われないため、摺動部において、摩耗、発熱、さらには摺動音が発生することになる。 に よ っ て Frictional wear and frictional heat are generated on the sliding surface between the rotating ring and the fixed ring by sliding contact. In a mechanical seal that seals the liquid, the liquid that is the sealing fluid flows into the sliding surface and lubricates and cools in this part. However, if the sealing fluid is a gas, lubrication and cooling with the sealing fluid is performed. Therefore, wear, heat generation, and sliding noise are generated in the sliding portion.
　このような問題に対処するため、固定環と回転環とを離間させ、両者間にシール流体とは別のバリア用流体(例えば、バリアガス)を供給して流体膜を形成し、この流体膜の圧力で固定環と回転環の間(すなわち密封端面の間)に間隙を確保し且つ密封端面の間をシールする静圧形非接触式メカニカルシールが提案されている(特許文献１、２)。 In order to cope with such a problem, the stationary ring and the rotating ring are separated from each other, and a fluid for barrier (for example, a barrier gas) different from the sealing fluid is supplied therebetween to form a fluid film. There has been proposed a hydrostatic non-contact mechanical seal that secures a gap between a fixed ring and a rotating ring (that is, between sealed end faces) by pressure and seals between the sealed end faces (Patent Documents 1 and 2).
　この静圧形非接触式メカニカルシールでは、固定環と回転環の間に流体を供給するために、配管に設けられた絞りと、この絞りを経て供給された流体を摺動面全体に行き渡らせるために固定環に設けられた溝とを組み合わせた構成が用いられている。 In this static pressure type non-contact mechanical seal, in order to supply fluid between the stationary ring and the rotating ring, the throttle provided in the pipe and the fluid supplied through the throttle are spread over the entire sliding surface. Therefore, a configuration in which a groove provided in the stationary ring is combined is used.
ＷＯ９９／２７２８１号WO99 / 27281 特開２０１１－２２０５２８号公報JP 2011-220528 A
　しかしながら、上述したような従来技術の静圧形非接触式メカニカルシールは、バリアガス等の流体の量が多くなるため間隙が広くなり、さらに、バリアガス等の流体による流体膜の圧力分布が不均一になるため、高いシール性が得られないという問題があった。 However, the conventional static pressure type non-contact mechanical seal as described above has a large gap due to an increase in the amount of fluid such as barrier gas, and the fluid film pressure distribution due to the fluid such as barrier gas is not uniform. Therefore, there is a problem that high sealing performance cannot be obtained.
　さらに、絞りおよび溝の加工が容易ではなく、製造に費用と手間がかかるという問題もあった。 Furthermore, there is a problem that drawing and grooves are not easy to process, and manufacturing is expensive and troublesome.
　本発明はこのような点に鑑みてなされたものであり、高いシール性が得られ、安価で且つ容易に製造が可能なメカニカルシールを提供することを目的とする。 The present invention has been made in view of these points, and an object of the present invention is to provide a mechanical seal that can obtain high sealing performance, is inexpensive, and can be easily manufactured.
　本発明によれば、
　メカニカルシールであって、
　回転軸に固定された回転環と、
　該回転軸が貫通する機体側部材に連結され前記回転環と対向配置された固定環であって、前記回転環と対向する前記固定環の面の少なくとも一部が多孔質部材で構成されている固定環と、
　前記多孔質部材に加圧されたバリア流体を供給する手段と、を備えている、
　ことを特徴とするメカニカルシールが提供される。 According to the present invention,
A mechanical seal,
A rotating ring fixed to the rotating shaft;
A stationary ring connected to the machine body side member through which the rotating shaft passes and disposed opposite to the rotating ring, wherein at least a part of the surface of the stationary ring facing the rotating ring is formed of a porous member. A stationary ring,
Means for supplying a pressurized barrier fluid to the porous member,
A mechanical seal is provided.
　このような構成によれば、回転環と対向する固定環の面、すなわち静止側の密封端面の少なくとも一部が多孔質部材で構成され、この多孔質部材に加圧されたバリア流体が供給される。この結果、多孔質部材を介して、静止側の密封端面から加圧されたバリア流体が流出し、回転側の密封端面との間にバリア流体による流体膜が形成され、密封端面間の距離が維持され且つ密封端面間がシールされる。
　このように、複雑な機構を用いることなく密封端面間にバリア流体による流体膜を形成できる。さらに、静止側の密封端面から加圧されたバリア流体が流出する構成であるので、均一な流体膜が形成可能である。 According to such a configuration, the surface of the stationary ring facing the rotating ring, that is, at least a part of the stationary-side sealed end surface is configured by the porous member, and the pressurized barrier fluid is supplied to the porous member. The As a result, the pressurized barrier fluid flows out from the sealed end surface on the stationary side through the porous member, a fluid film is formed by the barrier fluid between the sealed end surface on the rotating side, and the distance between the sealed end surfaces is increased. Maintained and sealed between the sealed end faces.
In this way, a fluid film can be formed by the barrier fluid between the sealed end faces without using a complicated mechanism. In addition, since the pressurized barrier fluid flows out from the sealed end surface on the stationary side, a uniform fluid film can be formed.
　本発明の他の好ましい態様によれば、
　前記回転環と対向する前記固定環の面の全体が多孔質部材で構成されている。 According to another preferred embodiment of the invention,
The entire surface of the stationary ring facing the rotating ring is composed of a porous member.
　このような構成によれば、静止側の密封端面全体から加圧されたバリア流体が流出する構成であるので、より均一な流体膜の形成が可能である。 According to such a configuration, since the pressurized barrier fluid flows out from the entire sealed end surface on the stationary side, a more uniform fluid film can be formed.
　本発明の他の好ましい態様によれば、
　前記固定環が多孔質部材で構成され、
　前記固定環が、環状の凹部を有する固定環バックメタルの凹部の上部に嵌合され、
　前記バリア流体が、前記固定環バックメタルの凹部の下部空間に供給される。 According to another preferred embodiment of the invention,
The stationary ring is composed of a porous member;
The stationary ring is fitted to the upper part of the concave portion of the stationary ring back metal having an annular concave portion,
The barrier fluid is supplied to the lower space of the concave portion of the stationary ring back metal.
　このような構成によれば、固定環には、回転環と対向する面（静止側の密封端面）とは反対側に位置する面の全体にバリア流体が供給されるので、静止側の密封端面の全体からバリア流体を流出させ、更に均一な流体膜の形成が可能である。 According to such a configuration, since the barrier fluid is supplied to the entire surface located on the opposite side of the surface facing the rotating ring (the stationary end sealing end surface), the stationary end sealing end surface It is possible to make the barrier fluid flow out from the entirety, and to form a more uniform fluid film.
　本発明の他の好ましい態様によれば、
　前記回転環と対向する前記固定環の面の複数箇所が多孔質部材で構成され、
　前記多孔質部材が、前記回転環と対向する前記固定環の面において、円周方向に略等間隔に配置されている。 According to another preferred embodiment of the invention,
A plurality of locations on the surface of the stationary ring facing the rotating ring is composed of a porous member,
The porous members are arranged at substantially equal intervals in the circumferential direction on the surface of the stationary ring facing the rotating ring.
　このような構成によれば、静止側の密封端面上の一定間隔をおいた位置から加圧されたバリア流体が流出するので、より均一な流体膜の形成が可能である。 According to such a configuration, the pressurized barrier fluid flows out from a position at a constant interval on the stationary end surface of the stationary side, so that a more uniform fluid film can be formed.
　本発明の他の好ましい態様によれば、
　前記多孔質部材が、前記回転環と対向する前記固定環の面の全周にわたって延びるように配置されている。 According to another preferred embodiment of the invention,
The porous member is disposed so as to extend over the entire circumference of the surface of the stationary ring facing the rotating ring.
　このような構成によれば、静止側の密封端面で周方向に均一に加圧されたバリア流体が流出するので、より均一な流体膜の形成が可能である。 According to such a configuration, the barrier fluid pressurized uniformly in the circumferential direction on the stationary end surface on the stationary side flows out, so that a more uniform fluid film can be formed.
　このような構成を有する本発明によれば、高いシール性が得られ、安価で且つ容易に製造が可能なメカニカルシールが提供される。 According to the present invention having such a configuration, it is possible to provide a mechanical seal that can obtain high sealing performance, is inexpensive, and can be easily manufactured.
本発明の第１の実施形態のメカニカルシールの要部を示す概略的な断面図である。It is a schematic sectional drawing showing the important section of the mechanical seal of a 1st embodiment of the present invention. 図１のメカニカルシールの固定環と固定環バックメタルの分解斜視図である。It is a disassembled perspective view of the stationary ring and stationary ring back metal of the mechanical seal of FIG. 図１のメカニカルシールの固定環と固定環バックメタルの組立て状態の縦断面図である。It is a longitudinal cross-sectional view of the assembly state of the stationary ring and stationary ring back metal of the mechanical seal of FIG. 第１の実施態様のメカニカルシールの変形例のメカニカルシールの要部を示す図１と同様の概略的な断面図である。It is the same schematic sectional drawing as FIG. 1 which shows the principal part of the mechanical seal of the modification of the mechanical seal of a 1st embodiment. 第２の実施形態のメカニカルシールの変形例の固定環付近の構成を示す断面図である。It is sectional drawing which shows the structure of the stationary ring vicinity of the modification of the mechanical seal of 2nd Embodiment. 第２の実施形態のメカニカルシールのもう一つの変形例の固定環付近の構成を示す断面図である。It is sectional drawing which shows the structure of the stationary ring vicinity of another modification of the mechanical seal of 2nd Embodiment. 第２の実施形態のメカニカルシールのもう一つの変形例の固定環付近の構成を示す断面図である。It is sectional drawing which shows the structure of the stationary ring vicinity of another modification of the mechanical seal of 2nd Embodiment. 本発明の他の実施形態の固定環の平面図である。It is a top view of the stationary ring of other embodiment of this invention. 本発明のもう一つの実施形態の固定環の平面図である。It is a top view of the stationary ring of another embodiment of this invention. 本発明のもう一つの実施形態の固定環の平面図である。It is a top view of the stationary ring of another embodiment of this invention. 本発明のもう一つの実施形態の固定環の平面図である。It is a top view of the stationary ring of another embodiment of this invention.
　以下、本発明の第１の実施形態のメカニカルシール１の構成を説明する。図１は、本発明の第１の実施形態のメカニカルシールの要部を示す概略的な断面図である。 Hereinafter, the configuration of the mechanical seal 1 according to the first embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view showing a main part of a mechanical seal according to a first embodiment of the present invention.
　本実施形態のメカニカルシール１は、図示しないボルトによってポンプ等の回転軸Ｓに固定された円筒状のスリーブ２を備えている。図１において左側に示されている、スリーブ２の機内側の端部には、径方向外方に延びる肉厚のフランジ状の立ち上がり部２ａが形成されている。立ち上がり部２ａの軸線方向中央の径方向内端には、円周方向の延びる環状溝２ｂが形成され、この環状溝２ｂ内には、Ｏリング４が配置され、回転軸Ｓとスリーブ２との間にシールを形成している。 The mechanical seal 1 of the present embodiment includes a cylindrical sleeve 2 fixed to a rotary shaft S such as a pump by a bolt (not shown). A thick flange-like rising portion 2a extending outward in the radial direction is formed at the inner end of the sleeve 2 shown on the left side in FIG. An annular groove 2b extending in the circumferential direction is formed at the radially inner end in the axial center of the rising portion 2a. An O-ring 4 is disposed in the annular groove 2b, and the rotation shaft S and the sleeve 2 are connected to each other. A seal is formed between them.
　スリーブ２の立ち上がり部２ａの軸線方向外方(大気側)には、環状の回転環バックメタル６を介して回転環８が配置されている。回転環バックメタル６は、回転環８を支持する部材であり、軸線方向に延びる本体部分６ａと、本体部分６ａの軸線方向略中央位置から径方向内方に向かって延びる垂下部分６ｂとを備えている。 A rotating ring 8 is disposed on the outer side (atmosphere side) in the axial direction of the rising portion 2 a of the sleeve 2 via an annular rotating ring back metal 6. The rotating ring back metal 6 is a member that supports the rotating ring 8, and includes a main body portion 6a that extends in the axial direction, and a hanging portion 6b that extends radially inward from a substantially central position in the axial direction of the main body portion 6a. ing.
　図１に示されているように、回転環バックメタル６は、本体部分６ａの機内側の端部がスリーブ２の立ち上がり部２ａの径方向外端に当接し、垂下部分６ｂがスリーブ２の立ち上がり部２ａの大気側に位置するように配置されている。
　また、スリーブ２の立ち上がり部２ａの径方向外端には、環状溝２ｃが形成され、この環状溝２ｃ内には、Ｏリング１０が配置され、スリーブ２と回転環バックメタル６との間にシールを形成している。 As shown in FIG. 1, the rotating ring back metal 6 has an inner end of the main body portion 6 a that abuts against a radially outer end of the rising portion 2 a of the sleeve 2, and a hanging portion 6 b that rises of the sleeve 2. It arrange | positions so that it may be located in the atmosphere side of the part 2a.
An annular groove 2 c is formed at the radially outer end of the rising portion 2 a of the sleeve 2, and an O-ring 10 is disposed in the annular groove 2 c, and between the sleeve 2 and the rotating ring back metal 6. A seal is formed.
　さらに、スリーブ２の立ち上がり部２ａの大気側面には、軸線方向に延びる凹部２ｄが形成され、この凹部２ｄ内には、先端が回転環バックメタル６の垂下部分６ｂを大気側に押圧するスプリング１２が収容され、回転環バックメタル６を回転環８に向けて付勢している。 Furthermore, a concave portion 2d extending in the axial direction is formed on the atmospheric side surface of the rising portion 2a of the sleeve 2, and a spring 12 whose tip presses the suspended portion 6b of the rotating ring back metal 6 toward the atmospheric side in the concave portion 2d. Is accommodated, and the rotating ring back metal 6 is urged toward the rotating ring 8.
　回転環８は、固定環１４との間に回転シールを形成する部材であり、本実施形態のメカニカルシール１では、超硬合金で形成されている。 The rotary ring 8 is a member that forms a rotary seal with the fixed ring 14, and is formed of cemented carbide in the mechanical seal 1 of the present embodiment.
　一方、固定環１４は、通気性を有する多孔質カーボンで形成されている。そして、固定環１４の大気側には、環状の固定環バックメタル１６が配置され、固定環１４を大気側から支持している。 On the other hand, the stationary ring 14 is formed of porous carbon having air permeability. An annular stationary ring back metal 16 is disposed on the atmosphere side of the stationary ring 14 and supports the stationary ring 14 from the atmosphere side.
　回転環８は、固定環１４の機内側面１４ａと対向する大気側面８ａを備えている。回転環８の大気側面８ａが回転側の密封端面となり、固定環１４の機内側面１４ａが静止側の密封端面となる。
　上述したように、回転環８を支持する回転環バックメタル６がスプリング１２によって回転環８に向けて付勢されているので、回転環８は、回転環バックメタル６を介してスプリング１２で大気方向すなわち固定環１４に向けて付勢されることにある。 The rotating ring 8 includes an atmospheric side surface 8 a that faces the in-machine side surface 14 a of the stationary ring 14. The atmospheric side surface 8a of the rotating ring 8 serves as a sealing end surface on the rotating side, and the in-machine side surface 14a of the stationary ring 14 serves as a sealing end surface on the stationary side.
As described above, since the rotating ring back metal 6 that supports the rotating ring 8 is biased toward the rotating ring 8 by the spring 12, the rotating ring 8 is moved to the atmosphere by the spring 12 via the rotating ring back metal 6. It is to be biased toward the direction, that is, the fixed ring 14.
　固定環バックメタル１６は、径方向外側でケーシング１８に連結されている。ケーシング１８は、図１に示されているように、略Ｌ字型の断面形状を有し、固定環バックメタル１６の径方向外方側および大気側に配置されている。
　固定環バックメタル１６とケーシング１８の間には、２本のＯリング２０、２２が配置されシールを形成している。
　ケーシング１８の機内側には、環状の機内側ケーシング２４が配置されている。 The stationary ring back metal 16 is connected to the casing 18 on the radially outer side. As shown in FIG. 1, the casing 18 has a substantially L-shaped cross-sectional shape, and is disposed on the radially outer side and the atmosphere side of the stationary ring back metal 16.
Two O- rings 20 and 22 are disposed between the stationary ring back metal 16 and the casing 18 to form a seal.
An annular machine casing 24 is disposed inside the casing 18.
　本実施形態のメカニカルシール１は、ケーシング１８、機内側ケーシング２４等を貫通するボルト２６、およびナット２８等によって、ポンプ、タンク等の気体側部材に取付けられる。 The mechanical seal 1 of the present embodiment is attached to a gas side member such as a pump and a tank by a bolt 26 penetrating the casing 18, the in-machine casing 24, a nut 28, and the like.
　スリーブ２の大気側の端部分には、セットカラー３０がセットスクリュー３２によって取付けられている。 A set collar 30 is attached to the end portion of the sleeve 2 on the atmosphere side by a set screw 32.
　固定環バックメタル１６、およびケーシング１８には、バリアガス供給通路１６ａ、１８ａがそれぞれ形成されている。これら固定環バックメタル１６のバリアガス供給通路１６ａとケーシング１８のバリアガス供給通路１８ａは互いに接続され、メカニカルシール１の外部に配置されて図示しないバリアガス供給装置からの加圧されたバリアガスを、固定環１４に導く（供給する）ことが出来るように構成されている。 Barrier gas supply passages 16a and 18a are formed in the stationary ring back metal 16 and the casing 18, respectively. The barrier gas supply passage 16a of the stationary ring back metal 16 and the barrier gas supply passage 18a of the casing 18 are connected to each other, and are disposed outside the mechanical seal 1 to supply pressurized barrier gas from a barrier gas supply device (not shown) to the stationary ring 14. It is configured so that it can be led (supplied).
　次に、固定環１４近傍の構成について、詳細に説明する。
　図２は、本実施形態のメカニカルシール１の固定環１４と固定環バックメタル１６の分解斜視図であり、図３は、固定環１４と固定環バックメタル１６の縦断面図である。 Next, the configuration near the stationary ring 14 will be described in detail.
FIG. 2 is an exploded perspective view of the fixed ring 14 and the fixed ring back metal 16 of the mechanical seal 1 of the present embodiment, and FIG. 3 is a longitudinal sectional view of the fixed ring 14 and the fixed ring back metal 16.
　図２及び図３に示されているように、ＳＵＳ等の合金鋼で形成された固定環バックメタル１６は、肉厚の環状材であり、軸線方向一方側の面に向かって開口する環状凹部３４が形成されている。 As shown in FIG. 2 and FIG. 3, the stationary ring back metal 16 formed of alloy steel such as SUS is a thick annular material, and is an annular recess that opens toward the surface on one side in the axial direction. 34 is formed.
　環状凹部３４は、開口端側(上部側)の断面矩形の幅広部３４ａと、幅広部３４ａの底に一体的に設けられた断面矩形の幅狭部３４ｂとを備えている。幅広部３４ａは、断面が固定環１４の断面と略等しい寸法形状とされ、この幅広部３４ａに、固定環１４が密封端面となる軸線方向一方側の面を突出させた状態で嵌合している。固定環１４と幅広部３４ａの側壁との間は気密状態となるように、固定環１４は、焼結接着等によって幅広部３４ａに取付け固定されている。 The annular recess 34 includes a wide section 34a having a rectangular cross section on the opening end side (upper side) and a narrow section 34b having a rectangular cross section provided integrally with the bottom of the wide section 34a. The wide portion 34a has a cross-sectional shape that is substantially the same as the cross section of the stationary ring 14. The wide portion 34a is fitted in a state in which the surface on one side in the axial direction where the stationary ring 14 serves as a sealing end surface protrudes. Yes. The fixed ring 14 is attached and fixed to the wide portion 34a by sintering adhesion or the like so that the space between the fixed ring 14 and the side wall of the wide portion 34a is airtight.
　幅狭部３４ｂには、固定環バックメタル１６のバリアガス供給通路１６ａが連通されている。 The barrier gas supply passage 16a of the stationary ring back metal 16 is communicated with the narrow portion 34b.
　このような構成によって、環状凹部３４の開口端側の上方部分が固定環１４によって閉鎖され、固定環１４の下方に幅狭部３４ｂによる環状の密閉空間が形成される。さらに、この幅狭部３４ｂによる環状の密閉空間すなわち固定環１４の裏側に位置する環状の密閉空間内に、固定環バックメタル１６のバリアガス供給通路１６ａ、およびケーシング１８のバリアガス供給通路１８ａを介して、矢印Ａ、Ｂで示されるように、外部のバリアガス供給装置(図示せず)からの加圧バリアガスが供給されることになる。 With this configuration, the upper portion of the annular recess 34 on the open end side is closed by the stationary ring 14, and an annular sealed space is formed below the stationary ring 14 by the narrow portion 34 b. Further, in the annular sealed space formed by the narrow portion 34b, that is, in the annular sealed space located on the back side of the stationary ring 14, the barrier gas supply passage 16a of the stationary ring back metal 16 and the barrier gas supply passage 18a of the casing 18 are interposed. As indicated by arrows A and B, pressurized barrier gas is supplied from an external barrier gas supply device (not shown).
　本実施形態のメカニカルシール１では、固定環１４が通気性を有する多孔質カーボンで形成されているので、裏側(大気側)に存在する環状の密閉空間３４ｂ内に加圧バリアガスが供給されると、加圧バリアガスは、矢印Ｃで示すように固定環１４を通り抜けて、固定環１４の機内側面（静止側の密封端面）１４ａから噴出する。 In the mechanical seal 1 of this embodiment, since the stationary ring 14 is made of porous carbon having air permeability, when pressurized barrier gas is supplied into the annular sealed space 34b existing on the back side (atmosphere side). The pressurized barrier gas passes through the stationary ring 14 as indicated by an arrow C, and is ejected from the machine inner side surface (static end surface on the stationary side) 14a of the stationary ring 14.
　この結果、回転環８の大気側面８ａと固定環１４の機内側面１４ａとの間に、加圧バリアガスが流入し、回転環８および回転環バックメタル６がスプリング１２の付勢力に抗しながら機内側に後退する。そして、回転環８の大気側面（回転側の密封端面）８ａと固定環１４の機内側面（静止側の密封端面）１４ａとの間に加圧バリアガスによる厚さ数μｍの流体膜Ｍが形成される。この流体膜Ｍによって、回転環８の大気側面８ａと、固定環１４の機内側面１４ａとの間にシールが形成されることになる。 As a result, the pressurized barrier gas flows between the atmospheric side surface 8 a of the rotating ring 8 and the in-machine side surface 14 a of the stationary ring 14, and the rotating ring 8 and the rotating ring back metal 6 resist the urging force of the spring 12. Retreat inward. Then, a fluid film M having a thickness of several μm is formed by the pressurized barrier gas between the atmospheric side surface (rotational side sealing end surface) 8a of the rotating ring 8 and the in-machine side surface (stationary sealing end surface) 14a of the stationary ring 14. The With this fluid film M, a seal is formed between the atmospheric side surface 8 a of the rotating ring 8 and the in-machine side surface 14 a of the stationary ring 14.
　加圧バリアガスとしては、空気の他、窒素ガス、アルゴンガス等が用途に応じて適宜選択される。また、加圧バリアガスに変えて、加圧された他の加圧流体、例えば、水、油等も使用可能である。 As the pressurized barrier gas, nitrogen gas, argon gas, etc. are appropriately selected according to the use in addition to air. Further, instead of the pressurized barrier gas, other pressurized fluids such as water and oil can be used.
　加圧バリアガス、あるいは他の加圧流体の或る力は、機内側と大気の圧力差等の種々の条件を勘案して、回転環と固定環との間に所望のシールが形成できる圧力に設定される。 A certain force of the pressurized barrier gas or other pressurized fluid is adjusted to a pressure at which a desired seal can be formed between the rotating ring and the stationary ring in consideration of various conditions such as the pressure difference between the inside of the machine and the atmosphere. Is set.
　このような構成によれば、回転環８に対向する固定環１４の機内側面１４ａの全体から略均一に加圧バリアガスを噴出させることができるので、回転環８の大気側面８ａと固定環１４の機内側面１４ａとの間の流体膜Ｍの圧力を高い状態に維持することが容易となる。この結果、膜厚の均一化、膜厚すなわち回転環８の大気側面８ａと固定環１４の機内側面１４ａの間隔の最小化が実現される。 According to such a configuration, since the pressurized barrier gas can be ejected substantially uniformly from the entire in-machine side surface 14a of the stationary ring 14 facing the rotating ring 8, the atmospheric side surface 8a of the rotating ring 8 and the stationary ring 14 It becomes easy to maintain the pressure of the fluid film M between the in-machine side surface 14a in a high state. As a result, the film thickness is made uniform, that is, the distance between the air side surface 8a of the rotating ring 8 and the in-machine side surface 14a of the stationary ring 14 is minimized.
　このため、シール性と向上させつつ、バリアガスの消費量が抑制できる。 Therefore, the consumption of barrier gas can be suppressed while improving the sealing performance.
　さらに、固定環１４の材料として、自己潤滑性が高い多孔質カーボンを使用しているので、何らかの理由で、固定環１４が回転環８に接触した場合でも、かじり等の問題が生じにくい。 Furthermore, since porous carbon having a high self-lubricating property is used as the material of the stationary ring 14, even if the stationary ring 14 contacts the rotating ring 8 for some reason, problems such as galling are unlikely to occur.
　図４は、上記第１の実施態様のメカニカルシールの変形例のメカニカルシール１’の要部を示す図１と同様の概略的な断面図である。 FIG. 4 is a schematic cross-sectional view similar to FIG. 1, showing the main part of a mechanical seal 1 'of a modified example of the mechanical seal of the first embodiment.
　変形例のメカニカルシール１’の基本構成は、上記第１の実施態様のメカニカルシール１と同一である。メカニカルシール１との主な相違点は、ケーシングが軸線方向に分割され、大気側に配置された第１のケーシング１８’に収容されたスプリング１２’が、固定環バックメタル１６を機内側に付勢している点である。さらに、ケーシングのバリアガス供給通路１８ａは、機内側の第２のケーシング１８”に形成されている。 The basic structure of the mechanical seal 1 ′ of the modification is the same as that of the mechanical seal 1 of the first embodiment. The main difference from the mechanical seal 1 is that the casing is divided in the axial direction, and the spring 12 ′ accommodated in the first casing 18 ′ arranged on the atmosphere side attaches the stationary ring back metal 16 to the inside of the machine. This is the point. Furthermore, the barrier gas supply passage 18a of the casing is formed in the second casing 18 "inside the machine.
　この変形例のメカニカルシール１’では、回転環８の大気側面８ａと固定環１４の機内側面１４ａとの間に、加圧バリアガスが流入すると、固定環１４および固定環バックメタル１６がスプリング１２’の付勢力に抗しながら大気側に後退する。そして、回転環８の大気側面８ａと固定環１４の機内側面１４ａの間に、第１の実施形態のメカニカルシールと同様に、加圧バリアガスよる流体膜Ｍが形成され、この流体膜Ｍによって、回転環８の大気側面８ａと、固定環１４の機内側面１４ａとの間にシールが形成されることになる。 In this modified mechanical seal 1 ′, when pressurized barrier gas flows between the atmospheric side surface 8a of the rotating ring 8 and the in-machine side surface 14a of the stationary ring 14, the stationary ring 14 and the stationary ring back metal 16 are moved to the spring 12 ′. Retreats to the atmosphere while resisting the urging force. And, like the mechanical seal of the first embodiment, a fluid film M made of pressurized barrier gas is formed between the atmospheric side surface 8a of the rotating ring 8 and the in-machine side surface 14a of the stationary ring 14, and by this fluid film M, A seal is formed between the atmospheric side surface 8 a of the rotating ring 8 and the in-machine side surface 14 a of the stationary ring 14.
　図５ないし図７は、本発明の第２の実施形態のメカニカルシールおよびその変形例のメカニカルシールの固定環付近の構成を示す断面図である。 FIG. 5 to FIG. 7 are cross-sectional views showing the configuration in the vicinity of the stationary ring of the mechanical seal of the second embodiment of the present invention and the mechanical seal of a modification thereof.
　上記第１の実施形態のメカニカルシール１は、金属製の固定環バックメタル１６に多孔質カーボン性の固定環１４が収容された構成を備えていたが、第２の実施形態のメカニカルシール４０では、メカニカルシール１の固定環バックメタル１６と固定環１４に相当する部分である固定環部材４２が、多孔質カーボンによって一体的に形成されている。 The mechanical seal 1 according to the first embodiment has a configuration in which the porous carbon stationary ring 14 is accommodated in the metal stationary ring back metal 16. However, in the mechanical seal 40 according to the second embodiment, The stationary ring back metal 16 and the stationary ring member 42 corresponding to the stationary ring 14 of the mechanical seal 1 are integrally formed of porous carbon.
　固定環部材４２の径方向外方部分には、ケーシング１８のバリアガス供給通路１８ａと連通するバリアガス供給通路４２ａが形成され、加圧バリアガスを固定環部材４２内に導入できるように構成されている。さらに、固定環部材４２には、回転環に対向し静止側の密封端面を構成する環状の機内側面４２ｂが設けられている。 A barrier gas supply passage 42a communicating with the barrier gas supply passage 18a of the casing 18 is formed in the radially outer portion of the fixed ring member 42 so that the pressurized barrier gas can be introduced into the fixed ring member 42. Further, the fixed ring member 42 is provided with an annular inner side surface 42b that faces the rotating ring and forms a stationary end face on the stationary side.
　本実施形態の固定環部材４２では、バリアガス供給通路４２ａの内面、および機内側面４２ｂを除く外周面全体に、一点鎖線で示す樹脂等による目詰まりMが施され、バリアガス供給通路４２ａに供給された加圧バリアガスが、機内側面４２ｂのみから噴出するように構成されている。 In the stationary ring member 42 of the present embodiment, the inner surface of the barrier gas supply passage 42a and the entire outer peripheral surface excluding the in-machine side surface 42b are clogged with resin indicated by a one-dot chain line and supplied to the barrier gas supply passage 42a. The pressurized barrier gas is configured to be ejected from only the inner side surface 42b.
　上記第２のメカニカルシール４０では、バリアガス供給通路４２ａが、固定環部材４２の径方向外方部分に形成されているが、図６に示されている変形例のメカニカルシール４２’のように、バリアガス供給通路４２ａ’が、固定環部材４２の径方向内方部分にまでのびるように形成された構成でもよい。 In the second mechanical seal 40, the barrier gas supply passage 42a is formed in the radially outer portion of the stationary ring member 42. However, like the mechanical seal 42 ′ of the modification shown in FIG. The configuration may be such that the barrier gas supply passage 42 a ′ extends to the radially inner portion of the stationary ring member 42.
　このような構成によれば、加圧バリアガスを機内側面４２ｂ全体からより均一に噴出させることが可能となる。 According to such a configuration, the pressurized barrier gas can be more uniformly ejected from the entire inner side surface 42b.
　一方、図７に示されている変形例のメカニカルシール４０”のように、固定環部材４２”にバリアガス供給通路を設けず、固定環部材４２”の径方向外方面に目詰まりを設けないバリアガス導入部４４を設け、このバリアガス導入部４４にケーシング１８のバリアガス供給通路１８ａを接続した構成でもよい。 On the other hand, unlike the mechanical seal 40 ″ of the modification shown in FIG. 7, the barrier gas supply passage is not provided in the stationary ring member 42 ″, and the barrier gas does not clog the radial outer surface of the stationary ring member 42 ″. An introduction portion 44 may be provided, and a barrier gas supply passage 18 a of the casing 18 may be connected to the barrier gas introduction portion 44.
　このような構成によれば、固定環部材の加工が容易になる。 According to such a configuration, it becomes easy to process the fixed ring member.
　本発明の前記実施形態に限定されることなく、特許請求の範囲に記載された技術的思想の範囲内で種々の変更、変形が可能である。 The present invention is not limited to the above-described embodiment, and various changes and modifications can be made within the scope of the technical idea described in the claims.
　上記実施形態では、回転環と対向する固定環の面（密封端面）全体が、多孔質カーボンで形成された構成であったが、本発明は、図８ないし図１１の固定環の平面図に示されているように密封端面の少なくとも一部が多孔質カーボン等の多孔質部材で形成された構成でもよい。 In the above embodiment, the entire surface of the stationary ring (sealed end surface) facing the rotating ring is formed of porous carbon. However, the present invention is a plan view of the stationary ring of FIGS. As shown, at least a part of the sealed end face may be formed of a porous member such as porous carbon.
　たとえば、複数の多孔質部分が、環状の密封端面の全周にわたって等間隔あるいは等しくなく間隔で配置された構成でもよい。
　例えば、図８に示されている構成では、環状の密封端面５２の幅方向中央位置に、複数の円形の多孔質部分５４が等間隔に配置されている。また、図９に示されている構成では、環状の密封端面６２の幅方向中央位置に、複数の湾曲した長円形の多孔質部分６４が等間隔に配置されている。 For example, a configuration in which a plurality of porous portions are arranged at equal intervals or at equal intervals over the entire circumference of the annular sealing end surface may be employed.
For example, in the configuration shown in FIG. 8, a plurality of circular porous portions 54 are arranged at equal intervals in the center position in the width direction of the annular sealing end surface 52. Further, in the configuration shown in FIG. 9, a plurality of curved oval porous portions 64 are arranged at equal intervals at the center position in the width direction of the annular sealing end surface 62.
　また、多孔質部分が、環状の密封端面の一部を覆って全周にわたって延びる構成でもよい。
　すなわち、図１０に示されている構成では、環状の密封端面７２の幅方向中央に、密封端面７２の幅より狭い幅の環状の多孔質部分７４が配置されている。また、図１１に示されている構成では、環状の密封端面８２の幅方向中央に、密封端面８２の幅より狭い幅の六角形の環状の多孔質部分８４が配置されている。 Moreover, the structure which a porous part covers a part of cyclic | annular sealing end surface, and extends over a perimeter may be sufficient.
That is, in the configuration shown in FIG. 10, an annular porous portion 74 having a width narrower than the width of the sealing end surface 72 is disposed at the center in the width direction of the annular sealing end surface 72. In the configuration shown in FIG. 11, a hexagonal annular porous portion 84 having a width narrower than the width of the sealing end surface 82 is disposed in the center of the annular sealing end surface 82 in the width direction.
　図８ないし図１１の構成においては、多孔質部分５４、６４、７４および８４は、固定環の密封端面(回転環と対向する固定環の面)５２、６２、７２および８２に、固定環の密封端面と同一平面(面一)となるように埋め込まれている。これら多孔質部分５４、６４、７４および８４の裏側には、加圧バリアガス等の加圧されたバリア流体が導入され、多孔質部分５４、６４、７４および８４の表面から加圧されたバリア流体が噴出し、流体膜が形成される。 8 to 11, the porous portions 54, 64, 74, and 84 are disposed on the sealing end surfaces (surfaces of the stationary ring facing the rotating ring) 52, 62, 72, and 82 of the stationary ring. It is embedded so as to be flush with the sealing end surface. A pressurized barrier fluid such as a pressurized barrier gas is introduced into the back side of the porous portions 54, 64, 74 and 84, and the barrier fluid pressurized from the surface of the porous portions 54, 64, 74 and 84 is introduced. Are ejected to form a fluid film.
　また、上記実施形態では、固定環が多孔質カーボンで形成されているが、固定環を流体が流通可能な他の多孔質体、例えば、焼結金属、多孔質樹脂等で形成してもよい。 In the above embodiment, the stationary ring is formed of porous carbon. However, the stationary ring may be formed of another porous body through which fluid can flow, for example, sintered metal, porous resin, or the like. .
　さらに、上記実施形態では、固定環バックメタル１６は、ＳＵＳ等の合金鋼で形成されているが、流体を透過しない他の材料、例えば、金属、合成樹脂、セラミックス、カーボン等で形成されていてもよい。 Furthermore, in the said embodiment, although the stationary ring back metal 16 is formed with alloy steel, such as SUS, it is formed with other materials which do not permeate | transmit a fluid, for example, a metal, a synthetic resin, ceramics, carbon, etc. Also good.
１：メカニカルシール
２：スリーブ
６：回転環バックメタル
８：回転環
１２：スプリング
１４：固定環
１６：固定環バックメタル
１８：ケーシング
２４：機内側ケーシング
１６ａ、１８ａ：バリアガス供給通路 1: Mechanical seal 2: Sleeve 6: Rotating ring back metal 8: Rotating ring 12: Spring 14: Fixed ring 16: Fixed ring back metal 18: Casing 24: Inner casing 16a, 18a: Barrier gas supply passage

Claims (5)

  1. 　メカニカルシールであって、
    　回転軸に固定された回転環と、
    　該回転軸が貫通する機体側部材に連結され前記回転環と対向配置された固定環であって、前記回転環と対向する前記固定環の面の少なくとも一部が多孔質部材で構成されている固定環と、
    　前記多孔質部材に加圧されたバリア流体を供給する手段と、を備えている、
    　ことを特徴とするメカニカルシール。     A mechanical seal,
    A rotating ring fixed to the rotating shaft;
    A stationary ring connected to the machine body side member through which the rotating shaft passes and disposed opposite to the rotating ring, wherein at least a part of the surface of the stationary ring facing the rotating ring is formed of a porous member. A stationary ring,
    Means for supplying a pressurized barrier fluid to the porous member,
    A mechanical seal characterized by that.
  2. 　前記回転環と対向する前記固定環の面の全体が多孔質部材で構成されている、
    　請求項１に記載のメカニカルシール。     The entire surface of the stationary ring facing the rotating ring is composed of a porous member.
    The mechanical seal according to claim 1.
  3. 　前記固定環が多孔質部材で構成され、
    　前記固定環が、環状の凹部を有する固定環バックメタルの凹部の上部に嵌合され、
    　前記バリア流体が、前記固定環バックメタルの凹部の下部空間に供給される、
    　請求項１または２に記載のメカニカルシール。     The stationary ring is composed of a porous member;
    The stationary ring is fitted to the upper part of the concave portion of the stationary ring back metal having an annular concave portion,
    The barrier fluid is supplied to the lower space of the recessed portion of the stationary ring back metal;
    The mechanical seal according to claim 1 or 2.
  4. 　前記回転環と対向する前記固定環の面の複数箇所が多孔質部材で構成され、
    　前記多孔質部材が、前記回転環と対向する前記固定環の面において、円周方向に略等間隔に配置されている、
    　請求項１に記載のメカニカルシール。     A plurality of locations on the surface of the stationary ring facing the rotating ring is composed of a porous member,
    The porous members are arranged at substantially equal intervals in the circumferential direction on the surface of the stationary ring facing the rotating ring.
    The mechanical seal according to claim 1.
  5. 　前記多孔質部材が、前記回転環と対向する前記固定環の面の全周にわたって延びるように配置されている、
    　請求項１に記載のメカニカルシール。     The porous member is disposed so as to extend over the entire circumference of the surface of the stationary ring facing the rotating ring.
    The mechanical seal according to claim 1.
PCT/JP2016/053733 2015-02-10 2016-02-09 Mechanical seal WO2016129574A1 (en)

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JP2011190902A (en) * 2010-03-16 2011-09-29 Nippon Pillar Packing Co Ltd Dry contact mechanical seal
JP2012167696A (en) * 2011-02-10 2012-09-06 Nippon Pillar Packing Co Ltd Non-contact type seal device

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DE69735197T2 (en) * 1997-11-21 2006-07-13 Nippon Pillar Packing Co., Ltd. STATIC PRESSURE CONTACTLESS GAS SEALING
CN101057093B (en) * 2004-11-09 2013-02-13 伊格尔工业股份有限公司 Mechanical seal device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011190902A (en) * 2010-03-16 2011-09-29 Nippon Pillar Packing Co Ltd Dry contact mechanical seal
JP2012167696A (en) * 2011-02-10 2012-09-06 Nippon Pillar Packing Co Ltd Non-contact type seal device

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