JP3440777B2 - Segment type shaft sealing device and drain pump provided with the same - Google Patents
Segment type shaft sealing device and drain pump provided with the sameInfo
- Publication number
- JP3440777B2 JP3440777B2 JP24502297A JP24502297A JP3440777B2 JP 3440777 B2 JP3440777 B2 JP 3440777B2 JP 24502297 A JP24502297 A JP 24502297A JP 24502297 A JP24502297 A JP 24502297A JP 3440777 B2 JP3440777 B2 JP 3440777B2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- sealing material
- sealing device
- seal
- sliding surface
- 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
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Sealing Devices (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はポンプの回転軸とケ
ーシング貫通部との隙間からの流体の漏れを防止するセ
グメント型軸封装置に係り、特に負圧対応の無給水軸封
装置とこれを搭載した排水ポンプに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment type shaft sealing device for preventing fluid leakage from a gap between a rotary shaft of a pump and a casing penetrating portion, and more particularly to a negative pressure-free waterless shaft sealing device. Regarding the installed drainage pump.
【０００２】[0002]
【従来の技術】河川水（土砂等の硬い粒子を含んだ水）
排水ポンプを対象にした場合、この種の立軸形排水ポン
プの軸封装置としては、一般的に、シール材に紐状のパ
ッキンを使用したグランドパッキン構造が使用されてい
る。この軸封装置では、正圧・負圧いずれの条件でも使
用できるように、グランドパッキン摺動面へ潤滑水を供
給している。通常、潤滑水の供給圧力は、ランナ側の圧
力よりも約０.１ＭＰa高くしている。2. Description of the Related Art River water (water containing hard particles such as earth and sand)
In the case of a drainage pump, a gland packing structure using a string-like packing as a sealing material is generally used as a shaft sealing device of this type of vertical shaft type drainage pump. In this shaft sealing device, lubricating water is supplied to the sliding surface of the gland packing so that it can be used under both positive and negative pressure conditions. Normally, the supply pressure of the lubricating water is about 0.1 MPa higher than the pressure on the runner side.
【０００３】最近では、機械設計第３２巻第２号（１９
８８年２月号）に記載されているようにシール材に耐摩
耗性に優れたセラミックスを用いたメカニカルシールが
使用されるようになってきた。正圧の場合は揚水液で潤
滑されるので外部からは無給水である。Recently, Machine Design Vol. 32, No. 2, (19)
As described in (February 1988), mechanical seals made of ceramics having excellent wear resistance have been used as sealing materials. In the case of positive pressure, no water is supplied from the outside because it is lubricated by pumped water.
【０００４】しかし、負圧の場合は摺動面がドライ状態
となるので、潤滑を目的に外部から給水して使用され
る。However, in the case of negative pressure, since the sliding surface is in a dry state, water is supplied from the outside for lubrication for use.
【０００５】一方、ポンプ主軸とシール材との間にわず
かなギャップを設けて非接触状態でシールする方法が、
実開昭62−147766号公報に開示されている。On the other hand, a method of sealing in a non-contact state by providing a slight gap between the pump main shaft and the seal material is
It is disclosed in Japanese Utility Model Publication No. 62-147766.
【０００６】また、排水ポンプの外部から軸封装置に潤
滑水を注入し、負圧運転に対応する方法が、特開平2−1
54869 号公報に開示されている。Further, a method of injecting lubricating water into the shaft seal device from the outside of the drainage pump to cope with negative pressure operation is disclosed in Japanese Patent Laid-Open No. 2-1.
It is disclosed in Japanese Patent No. 54869.
【０００７】[0007]
【発明が解決しようとする課題】実開昭62−147766号公
報に開示されているような軸封装置では、シール材とポ
ンプ主軸とが通常は非接触状態にあり、潤滑水がない負
圧条件においても長時間の運転が可能である。In the shaft sealing device as disclosed in Japanese Utility Model Laid-Open No. 147766/1987, the sealing material and the pump main shaft are normally in non-contact with each other, and the negative pressure without lubricating water is present. It is possible to operate for a long time even under the conditions.
【０００８】また、特開平2−154869 号公報に開示され
ているような軸封装置及びグランドパッキン構造では、
負圧条件においては常に外部から注水がシール材へ行わ
れるので、長時間運転をする場合には、多量の潤滑水を
必要とする。Further, in the shaft sealing device and the gland packing structure as disclosed in JP-A-2-154869,
Under negative pressure conditions, water is always injected into the seal material from the outside, so a large amount of lubricating water is required for long-term operation.
【０００９】また、給水配管系を設けていることから、
配管の保全管理が必要となり、そのための負担が多くな
る。更に、給水配管系のトラブルなどでポンプが起動で
きなくなる恐れもあった。Since a water supply piping system is provided,
Maintenance and management of piping is required, and the burden for that increases. Further, there is a risk that the pump cannot be started due to a trouble in the water supply piping system.
【００１０】すなわち、上述のような軸封構造の場合
は、漏水量が少なく、かつ、ポンプの外部から潤滑水の
給水を受けずに、長時間の負圧運転を行うことは不可能
である。That is, in the case of the shaft sealing structure as described above, it is impossible to perform a long negative pressure operation without leaking the lubricating water from the outside of the pump with a small amount of water leakage. .
【００１１】本発明は、このような事情に鑑みなされた
ものであり、漏水量が少なく、かつ、シール材の潤滑水
をポンプの外部から給水することなく、長時間の負圧運
転を安定して行うことができるポンプの軸封装置を提供
することを目的とする。The present invention has been made in view of the above circumstances, and has a small amount of water leakage, and stabilizes long-time negative pressure operation without supplying lubricating water for the sealing material from the outside of the pump. It is an object of the present invention to provide a shaft seal device for a pump that can be carried out by
【００１２】[0012]
【課題を解決するための手段】すなわち本発明は、ポン
プ主軸にスリーブが固定され、このスリーブの外周位置
に配置されるシールケースと、このシールケース及びス
リーブの間に周方向に沿って複数配設されたセグメント
状のシール材を配置したセグメント型軸封装置におい
て、スリーブを超硬合金製の筒状部材とし、シール材を
セラミックスとし、該シール材の摺動面を楕円形状と
し、該シール材の大気側側面と該大気側端面と対向する
カバー面とで構成される隙間に減圧手段を設けたことに
より所期の目的を達成するようにしたものである。That is, according to the present invention, a sleeve is fixed to a pump main shaft, and a plurality of seal cases are arranged at the outer peripheral position of the sleeve, and a plurality of seal cases are arranged between the seal case and the sleeve in the circumferential direction. In the segment-type shaft sealing device in which the installed segment-shaped sealing material is arranged, the sleeve is a cylindrical member made of cemented carbide and the sealing material is
Ceramics, the sliding surface of the sealing material is elliptical
And, in which so as to achieve the desired object by providing the pressure reduction means in the gap formed between the atmosphere-side side surface and the atmosphere-side end face facing the cover surface of the seal member.
【００１３】本発明の他の特徴は、ポンプ主軸にスリー
ブが固定され、このスリーブの外周位置に配置されるシ
ールケースと、このシールケース及びスリーブの間に周
方向に沿って複数配設されたセグメント状のシール材を
配置したセグメント型軸封装置において、スリーブを超
硬合金製の筒状部材とし、シール材をセラミックスと
し、該シール材の摺動面を楕円形状とし、該シール材の
摺動面をポンプ主軸の停止時、該スリーブ摺動面に接触
させ、かつ、該シール材の大気側側面と該大気側端面と
対向するカバー面とで構成される隙間に減圧手段を設け
たことにある。 Another feature of the present invention is that a sleeve is fixed to a pump main shaft, a seal case is arranged at an outer peripheral position of the sleeve, and a plurality of seal cases are provided between the seal case and the sleeve along the circumferential direction. in the segment-type shaft sealing device arranged segments like sealing material, a sleeve super
A cylindrical member made of hard alloy and a ceramic sealing material
The sliding surface of the sealing material is elliptical,
The sliding surface contacts the sliding surface of the sleeve when the pump spindle is stopped.
And providing a pressure reducing means in a gap defined by the atmosphere-side surface of the sealing material and the cover surface facing the atmosphere- side end surface.
There is something.
【００１４】本発明の更に他の特徴は、ポンプ主軸にス
リーブが固定され、このスリーブの外周位置に配置され
るシールケースと、このシールケース及びスリーブの間
に周方向に沿って複数配設されたセグメント状のシール
材を配置したセグメント型軸封装置において、スリーブ
を超硬合金製の筒状部材とし、シール材をセラミックス
とし、該シール材の摺動面を楕円形状とし、該シール材
の大気側側面と該大気側端面と対向するカバー面とで構
成される隙間に減圧手段を設け、かつ該シール材摺動面
に大気側と連通した溝を設けたことにある。 Still another feature of the present invention is that a sleeve is fixed to a pump main shaft, and a plurality of seal cases are arranged at an outer peripheral position of the sleeve, and a plurality of seal cases are arranged between the seal case and the sleeve in the circumferential direction. In a segment type shaft sealing device in which a segment-shaped sealing material is arranged, the sleeve is a cylindrical member made of cemented carbide, the sealing material is ceramics, and the sliding surface of the sealing material is elliptical . The pressure reducing means is provided in a gap formed by the side surface on the atmosphere side and the cover surface facing the end surface on the atmosphere side, and a groove communicating with the atmosphere side is provided on the sliding surface of the sealing material .
【００１５】本発明の他の特徴は、ポンプ主軸にスリー
ブが固定され、このスリーブの外周位置に配置されるシ
ールケースと、このシールケース及びスリーブの間に周
方向に沿って複数配設されたセグメント状のシール材を
配置したセグメント型軸封装置において、スリーブを超
硬合金製の筒状部材とし、シール材をセラミックスと
し、該シール材の摺動面を楕円形状とし、該シール材の
摺動面をポンプ主軸の停止時、該スリーブ摺動面に接触
させ、かつ、該シール材の大気側側面と該大気側端面と
対向するカバー面とで構成される隙間に減圧手段を設
け、更に、該シール材摺動面に大気側と連通した溝を設
けたことにある。 Another feature of the present invention is that a sleeve is fixed to the pump main shaft, and a plurality of seal cases are arranged at the outer peripheral position of the sleeve, and a plurality of seal cases are provided between the seal case and the sleeve along the circumferential direction. In a segment type shaft sealing device in which segment-shaped sealing materials are arranged, a sleeve is made of a cemented carbide cylindrical member, a sealing material is made of ceramics, and a sliding surface of the sealing material is made into an elliptical shape. A moving surface is brought into contact with the sleeve sliding surface when the pump spindle is stopped, and a pressure reducing means is provided in a gap formed by the atmosphere side surface of the sealing material and the cover surface facing the atmosphere side end surface. A groove communicating with the atmosphere side is provided on the sliding surface of the sealing material .
【００１６】またこの場合、前記セラミックスは炭化珪
素または四ふっ化エチレン樹脂を含浸した炭化珪素と
し、前記スリーブはすくなくともその表面を四ふっ化エ
チレン樹脂を含浸した超硬合金製の筒状部材または超硬
合金製皮膜にすると良い。このように形成された軸封装
置であると、シール材の大気側端面とこれと対向するカ
バー面とで構成される隙間に設けた減圧手段により、シ
ール材の摺動面とシール材の外周部とで圧力差が生じ、
シール材が負圧になると摺動面から浮上するように作用
するので摩擦力が減少し温度上昇がほとんどなくなり、
外部からの給水をしなくても安定して長時間の負圧条件
での運転が行えるのである。一方、セグメント型軸封装
置（シール材の合わせ目がゼロの場合）の漏水は端部お
よび摺動部の両方から生じる。この場合、端部の方が摺
動部よりも多く漏水する。端部からの漏水に対しての減
圧手段が正圧作用時には抵抗となるので端部からの漏水
量が減少する。その結果、全漏水量が減少し安定した密
封性能が得られる。Further, in this case, the ceramic is silicon carbide or silicon carbide impregnated with ethylene tetrafluoride resin, and the sleeve has at least a surface thereof made of a cemented carbide cylindrical member or a super-hard alloy impregnated with ethylene tetrafluoride resin. A hard alloy coating is recommended. In the shaft sealing device thus formed, the sliding surface of the sealing material and the outer periphery of the sealing material are reduced by the pressure reducing means provided in the gap formed between the atmospheric side end surface of the sealing material and the cover surface facing the sealing surface. Pressure difference occurs between the
When the sealing material becomes negative pressure, it acts so as to float from the sliding surface, so the frictional force decreases and the temperature rise almost disappears.
It is possible to operate stably under negative pressure conditions for a long time without supplying water from the outside. On the other hand, the water leakage of the segment type shaft seal device (when the joint of the sealing material is zero) occurs from both the end portion and the sliding portion. In this case, the end portion leaks more water than the sliding portion. When the positive pressure acts on the depressurizing means against water leaking from the end, the amount of water leaking from the end is reduced because it acts as a resistance. As a result, the total amount of water leakage is reduced and stable sealing performance can be obtained.
【００１７】[0017]
【発明の実施の形態】以下図示した実施例に基づいて本
発明を詳細に説明する。図１にはその軸封装置が断面で
示されている。軸封装置３は、回転する主軸すなわちポ
ンプ主軸１とポンプケーシング１８との隙間からの流体
の漏れを防止する装置であり、主として次のものより構
成されている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail based on the embodiments shown in the drawings. FIG. 1 shows the shaft seal device in cross section. The shaft sealing device 3 is a device that prevents fluid from leaking from a gap between the rotating main shaft, that is, the pump main shaft 1 and the pump casing 18, and is mainly composed of the following.
【００１８】すなわち、ポンプ主軸１の外周部に固定さ
れたスリーブ２と、このスリーブ２の外周位置に径方向
に間隙をもって配置されたシールケース６と、このシー
ルケース６及びスリーブ２間に周方向に沿って複数配設
されたセグメント状のシール材４と、このシール材４軸
方向に位置決めするカバー８とを有して構成されてい
る。ここでは、シール段数が１段構造の場合について説
明するが、シール段数は封水圧力，漏水量等により決ま
るものであり、特に限定するものではない。That is, the sleeve 2 fixed to the outer peripheral portion of the pump main shaft 1, the seal case 6 disposed at the outer peripheral position of the sleeve 2 with a gap in the radial direction, and the seal case 6 and the sleeve 2 in the circumferential direction. A plurality of segment-shaped sealing members 4 are provided along the cover member 8 and a cover 8 for positioning the sealing members 4 in the axial direction. Here, a case in which the number of sealing steps is one is described, but the number of sealing steps is determined by the sealing water pressure, the amount of water leakage, etc., and is not particularly limited.
【００１９】スリーブ２はポンプ主軸１に六角穴付き止
めネジ等（図示せず）で固定されている。このスリーブ
２は金属製のもので、一般にＳＵＳ４０３が使用され
る。The sleeve 2 is fixed to the pump main shaft 1 with a hexagon socket set screw or the like (not shown). The sleeve 2 is made of metal, and generally SUS403 is used.
【００２０】一方、シール材４は周方向に２分割した円
筒形状のカーボン材である。シール材４の外周側には、
ガータスプリング５を装着し、２分割した円筒形状のカ
ーボン材をリング状に保持している。シール材４は、軸
方向の一端部に溝１１が形成され、該溝１１にシールケ
ース６に設けられた回り止めピン９により、シールケー
ス６とスリーブ２との間で周方向にずれることがないよ
うにしている。そのため、シールケース６とシールケー
シング１０との間にも周方向にずれないように何らかの
固定手段を設けている（図示せず）。On the other hand, the sealing material 4 is a cylindrical carbon material divided into two in the circumferential direction. On the outer peripheral side of the sealing material 4,
A garter spring 5 is attached and a cylindrical carbon material divided into two is held in a ring shape. The seal member 4 has a groove 11 formed at one end in the axial direction, and a detent pin 9 provided in the seal case 6 in the groove 11 may shift the seal member 6 and the sleeve 2 in the circumferential direction. I try not to. Therefore, some fixing means is also provided between the seal case 6 and the seal casing 10 so as not to shift in the circumferential direction (not shown).
【００２１】ここでは、該溝１１は２分割されたシール
材４それぞれに加工し、かつ、シール材４周方向の中央
部に設けている。このように、回り止めの位置をシール
材の周方向の中央部に設けることは回転による動圧効果
を利用する上で好ましい。Here, the groove 11 is processed into each of the two divided sealing materials 4, and is provided at the central portion in the circumferential direction of the sealing material 4. As described above, it is preferable to provide the detent position at the central portion in the circumferential direction of the seal material in order to utilize the dynamic pressure effect due to the rotation.
【００２２】また、シール材４の大気側端面とカバー８
とで構成される間隙１３に減圧手段が設けられている。
この場合の減圧手段は２分割されたシール材の大気側端
面のそれぞれのに円周溝７を加工し、この円周溝７にＯ
リング１２等の弾性体（ゴム等）を装着固定し、装着固
定されたＯリング１２がカバー８と接触するように配置
したことにより構成されている。Ｏリング１２を装着し
た円周溝７をシール材側に設けているが、カバー側に設
けても同等の作用効果があり、特に限定しない。The atmosphere side end surface of the sealing material 4 and the cover 8
A pressure reducing means is provided in the gap 13 constituted by.
In this case, the depressurizing means processes a circumferential groove 7 on each of the atmosphere-side end faces of the divided sealing material, and the circumferential groove 7 is O-shaped.
An elastic body (rubber or the like) such as the ring 12 is mounted and fixed, and the mounted and fixed O ring 12 is arranged so as to come into contact with the cover 8. Although the circumferential groove 7 in which the O-ring 12 is mounted is provided on the sealing material side, providing it on the cover side has the same operational effect and is not particularly limited.
【００２３】図中のＰｏ側を大気側，Ｐ側を密封側とす
る。The Po side in the figure is the atmosphere side and the P side is the sealed side.
【００２４】図２（ａ）に減圧手段がない場合の負圧時
におけるシール材摺動面とシール材外周部との圧力分布
を示す。図２（ｂ）に減圧手段がある場合の負圧時にお
けるシール材摺動面とシール材外周部との圧力分布を示
す。FIG. 2 (a) shows the pressure distribution between the sliding surface of the seal material and the outer peripheral portion of the seal material at the time of negative pressure when there is no pressure reducing means. FIG. 2B shows the pressure distribution between the sliding surface of the sealing material and the outer peripheral portion of the sealing material when the pressure reducing means has a negative pressure.
【００２５】図２（ａ）に示すように、減圧手段を設け
ない場合はシール材外周部からの押し付け力は大気圧な
ので０、一方、摺動面の反力は(−１／２)ＬＰとなる。
ここで、Ｌはシール材の幅を示す。したがって、シール
材の浮上力は(−１／２)ＬＰとなり、シール材をスリー
ブ摺動面に押し付ける力が生じる。As shown in FIG. 2 (a), when the pressure reducing means is not provided, the pressing force from the outer peripheral portion of the sealing material is atmospheric pressure, so the reaction force is 0, while the reaction force of the sliding surface is (-1/2) LP. Becomes
Here, L represents the width of the sealing material. Therefore, the floating force of the sealing material becomes (-1/2) LP, and a force for pressing the sealing material against the sleeve sliding surface is generated.
【００２６】図２（ｂ）に示すように、減圧手段を設け
た場合はシール材外周部からの押し付け力は負圧となる
ので−ＬＰ、一方、摺動面の反力は(−１／２)ＬＰとな
る。したがって、シール材の浮上力は１／２ＬＰとな
り、シール材をスリーブ摺動面から浮上して運転でき
る。As shown in FIG. 2 (b), when the pressure reducing means is provided, the pressing force from the outer peripheral portion of the sealing material becomes negative pressure, so -LP, while the reaction force of the sliding surface is (-1 / 2) It becomes LP. Therefore, the floating force of the sealing material becomes 1/2 LP, and the sealing material can be operated by floating from the sliding surface of the sleeve.
【００２７】すなわちこのように形成された軸封装置で
あると、シール材の大気側端面とこれと対向するカバー
面とで構成される隙間１３に設けた減圧手段により、シ
ール材の摺動面とシール材の外周部とで圧力差が生じ、
シール材が負圧になると摺動面から浮上するように作用
するので摩擦力が減少し温度上昇がほとんどなくなり、
外部からの給水をしなくても安定して長時間の負圧条件
での運転が行えるのである。一方、セグメント型軸封装
置（シール材の合わせ目がゼロの場合）の漏水は端部お
よび摺動部の両方から生じる。この場合、端部の方が摺
動部よりも多く漏水する。端部からの漏水に対して減圧
手段が正圧作用時には抵抗となるので端面からの漏水量
が減少する。その結果、全漏水量が減少し安定した密封
性能が得られる。That is, in the shaft sealing device thus formed, the sliding surface of the seal material is reduced by the pressure reducing means provided in the gap 13 formed by the end surface of the seal material on the atmosphere side and the cover surface facing it. And a pressure difference between the outer periphery of the sealing material,
When the sealing material becomes negative pressure, it acts so as to float from the sliding surface, so the frictional force decreases and the temperature rise almost disappears.
It is possible to operate stably under negative pressure conditions for a long time without supplying water from the outside. On the other hand, the water leakage of the segment type shaft seal device (when the joint of the sealing material is zero) occurs from both the end portion and the sliding portion. In this case, the end portion leaks more water than the sliding portion. Since the pressure reducing means acts as a resistance against water leakage from the end portion when positive pressure is applied, the amount of water leakage from the end surface is reduced. As a result, the total amount of water leakage is reduced and stable sealing performance can be obtained.
【００２８】さらに、減圧手段として構成したＯリング
１２がカバー８と接触しているので、シール材４の周方
向の振動を押さえることができ、高信頼性の軸封装置が
提供できる。Further, since the O-ring 12 configured as a pressure reducing means is in contact with the cover 8, it is possible to suppress the vibration of the sealing material 4 in the circumferential direction and to provide a highly reliable shaft sealing device.
【００２９】図３に本発明による軸封装置の第２の実施
例を示す。この実施例において、前記第１の実施例と異
なるのはスリーブ２を金属リング２ｂの外周面に四ふっ
化エチレン樹脂を含浸した超硬合金部２ａを設けた筒状
部材とし、かつ、シール材４を周方向に２分割した円筒
形状の炭化珪素のセラミックスとした点にある。この筒
状部材は、金属リング２ｂ（材質：ＳＵＳ３０４等）の
外周面に溶射等により超硬合金製の皮膜を形成し、その
後、四ふっ化エチレン樹脂を超硬合金製の皮膜の空孔部
に含浸処理して製造される。また、この筒状部材が超硬
合金製のソリッド材であっても良い。ソリッド材による
超硬合金製の筒状部材は粉体−成形−焼結の順で製造さ
れた後に、表面に開口する空孔部に四ふっ化エチレン樹
脂を含浸して製造される。FIG. 3 shows a second embodiment of the shaft sealing device according to the present invention. This embodiment differs from the first embodiment in that the sleeve 2 is a tubular member having a metal ring 2b provided with a cemented carbide portion 2a impregnated with an ethylene tetrafluoride resin, and a sealing material. 4 is a cylindrical silicon carbide ceramics obtained by dividing 4 into two in the circumferential direction. This tubular member is formed by forming a coating of cemented carbide on the outer peripheral surface of a metal ring 2b (material: SUS304, etc.) by thermal spraying, etc., and then forming a tetrafluoroethylene resin in the pores of the coating of cemented carbide. It is manufactured by impregnation. Further, the tubular member may be a solid material made of cemented carbide. The cemented carbide cylindrical member made of a solid material is manufactured in the order of powder-molding-sintering and then impregnated with ethylene tetrafluoride resin in the pores opened on the surface.
【００３０】この実施例によれば、基本的には前述した
第１の実施例と同様の作用効果を得ることができる他、
スリーブ２に含浸された四ふっ化エチレン樹脂２ａがポ
ンプ主軸１が回転するとスリーブ摺動面に数ミクロンの
薄い四ふっ化エチレン樹脂皮膜を形成する。形成された
四ふっ化エチレン樹脂皮膜はすべりやすく摩擦係数が小
さいので、より安定した摺動特性が得られる。また、炭
化珪素のセラミックスはカーボンよりも硬度が高いので
シール材の長寿命化で耐摩耗性向上が期待できる。さら
に、超硬合金製の皮膜は高硬度でしかも酸化しやすいの
で摺動面が安定しており、焼き付きが防止され軸封装置
の信頼性が向上する。超硬合金製の皮膜のバインダーは
耐食性の点からニッケル系が好ましい。According to this embodiment, basically the same operational effect as that of the first embodiment described above can be obtained, and
When the pump spindle 1 rotates, the tetrafluoroethylene resin 2a impregnated in the sleeve 2 forms a thin film of tetrafluoroethylene resin of several microns on the sleeve sliding surface. The formed tetrafluoroethylene resin film is slippery and has a small friction coefficient, so that more stable sliding characteristics can be obtained. Further, since silicon carbide ceramics have higher hardness than carbon, it is expected that the life of the sealing material will be extended and the wear resistance will be improved. Furthermore, since the film made of cemented carbide has high hardness and is easily oxidized, the sliding surface is stable, seizure is prevented, and the reliability of the shaft sealing device is improved. The binder of the cemented carbide film is preferably nickel based from the viewpoint of corrosion resistance.
【００３１】図４に本発明のドライ及び負圧条件でのシ
ール材の温度上昇を測定した結果を示す。この場合、本
発明では、前述した実施例と同様のものであって、スリ
ーブ２を金属リング２ｂの外周面に四ふっ化エチレン樹
脂を含浸した超硬合金溶射皮膜２ａを設けた筒状部材と
し、かつ、シール材を周方向に２分割した円筒形状の炭
化珪素のセラミックスとした。スリーブ外径は１００mm
で、シール材の内径は１００.０８mmである。FIG. 4 shows the results of measuring the temperature rise of the sealing material under the dry and negative pressure conditions of the present invention. In this case, in the present invention, the sleeve 2 is the same as that of the above-described embodiment, and the sleeve 2 is a tubular member provided with the cemented carbide sprayed coating 2a impregnated with the tetrafluoroethylene resin on the outer peripheral surface of the metal ring 2b. Further, the sealing material is a cylindrical silicon carbide ceramic which is divided into two in the circumferential direction. Outer diameter of sleeve is 100mm
The inner diameter of the sealing material is 100.08 mm.
【００３２】シール材の温度は上部の位置で摺動面から
１mmの所にセンサを埋め込んで測定した。シール材の温
度上昇値はシール材の温度−気温である。本発明におい
て、ドライ運転時シール材の温度上昇値は時間経過と共
に上昇するが、負圧条件になるとシール材の温度上昇値
は急激に低下し、その後は時間の経過に関係なくほぼ一
定値で推移して、安定して長時間の負圧運転ができるこ
とがわかった。一方、従来例（減圧手段がない場合）の
シール材の温度上昇値は、負圧条件になるといったん低
下するものの、すぐに増加に転じその後は増加傾向を示
し、長時間の運転は困難であった。The temperature of the sealing material was measured by embedding a sensor at a position 1 mm above the sliding surface at the upper position. The temperature rise value of the sealing material is the temperature of the sealing material minus the ambient temperature. In the present invention, the temperature rise value of the seal material during dry operation rises with the passage of time, but when the negative pressure condition is reached, the temperature rise value of the seal material sharply decreases, and thereafter it remains at a substantially constant value regardless of the passage of time. As a result, it was found that stable negative pressure operation was possible for a long time. On the other hand, the temperature rise value of the seal material in the conventional example (when there is no pressure reducing means) decreases once under negative pressure conditions, but immediately starts to increase and then tends to increase, making it difficult to operate for a long time. It was
【００３３】図５に本発明による軸封装置の第３の実施
例を示す。この実施例において、前記第２の実施例と異
なるのは、シール段数を２段構造とした点にある。この
実施例によれば、基本的には前述した第２の実施例と同
様の作用効果を得ることができる他、２段構造となって
いるので段間の差圧が１段構造の１／２になり、漏気量
が減少する。FIG. 5 shows a shaft sealing device according to a third embodiment of the present invention. This embodiment differs from the second embodiment in that the number of sealing steps is a two-step structure. According to this embodiment, basically, the same operation and effect as those of the second embodiment described above can be obtained, and since the two-stage structure is provided, the differential pressure between the stages is 1 / one of that of the one-stage structure. 2 and the amount of air leaks decreases.
【００３４】また、正圧時の漏水量も減らすことができ
安定した密封性能が得られる。さらに、１段構造で十分
な性能があり、１段は予備シールとして機能するので、
万一１段が損傷しても予備シールでバックアップできる
ので信頼性が向上する。Also, the amount of water leakage at the time of positive pressure can be reduced and stable sealing performance can be obtained. Furthermore, the one-stage structure has sufficient performance, and the one-stage functions as a preliminary seal.
Even if the first step is damaged, the backup can be backed up with a preliminary seal, improving reliability.
【００３５】図６に本発明による軸封装置の第４の実施
例を示す。この実施例において、前記第２の実施例と異
なるのは、２分割シール材４ａを楕円形状にした点にあ
る。２分割のシール材４ａはスリーブの超硬合金溶射皮
膜２ａと上下部で接触した状態で配置されている。本実
施例では上下部で接触した状態で配置されているが、僅
かな隙間をもって配置しても良い。また、シール材４ａ
の摺動面をスリーブ摺動面に対し楕円形状としているの
で、水平方向にわずかな隙間が形成される。δａはスリ
ーブ摺動面とシール材の摺動面との上下部の隙間、δｂ
はスリーブ摺動面とシール材の摺動面との合わせ目部に
おける隙間である。図示のように、δａ＜δｂの寸法関
係にある。したがって、同芯の場合に比較しδａの寸法
が狭くなり、その結果、摺動部からの漏水量が減少す
る。また、Ｒａはスリーブ摺動面の半径、Ｒｂはシール
材４ａの摺動面の半径とすると、Ｒｂ＞Ｒａの関係にあ
る。ＲｂをＲａよりも僅かに大きくするだけで有効であ
る。シール材４の摺動面の半径Ｒｂはスリーブ摺動面の
半径Ｒａに対して、加工精度，許容漏水量等によって決
まるものである。さらに、水平方向の隙間が上下に比較
して大きいので万一金属リング２ｂが損傷しても、合わ
せ目部１３ａと金属リング２ｂが衝突することがなくな
り、合わせ目部１３ａでの割損が確実に防止でき、信頼
性が向上する。FIG. 6 shows a fourth embodiment of the shaft sealing device according to the present invention. This embodiment differs from the second embodiment in that the two-divided sealing material 4a has an elliptical shape. The two-part sealing material 4a is arranged in contact with the cemented carbide sprayed coating 2a of the sleeve at the upper and lower parts. In this embodiment, the upper and lower parts are arranged in contact with each other, but they may be arranged with a slight gap. Also, the sealing material 4a
Since the sliding surface of is oval with respect to the sliding surface of the sleeve, a slight gap is formed in the horizontal direction. δa is the gap between the sliding surface of the sleeve and the sliding surface of the sealing material, and δb
Is a gap at the joint between the sleeve sliding surface and the sealing material sliding surface. As shown, there is a dimensional relationship of δa <δb. Therefore, the size of δa becomes narrower than in the case of concentric core, and as a result, the amount of water leakage from the sliding portion decreases. Further, when Ra is the radius of the sliding surface of the sleeve and Rb is the radius of the sliding surface of the sealing material 4a, there is a relationship of Rb> Ra. It is effective to make Rb slightly larger than Ra. The radius Rb of the sliding surface of the seal member 4 is determined by the processing accuracy, the allowable amount of water leakage, etc. with respect to the radius Ra of the sliding surface of the sleeve. Further, since the gap in the horizontal direction is larger than that in the vertical direction, even if the metal ring 2b is damaged, the seam portion 13a and the metal ring 2b do not collide with each other, and the breakage at the seam portion 13a is sure. Can be prevented and reliability is improved.
【００３６】なお、これまで説明した実施例では、シー
ル材４，４ａを２分割した例を示したが、その分割数は
スリーブ２の直径で決まるので、図示実施例に限定され
るものではない。In the above-described embodiments, the sealing materials 4 and 4a are divided into two, but the number of divisions is determined by the diameter of the sleeve 2 and is not limited to the illustrated embodiment. .
【００３７】図７に本発明による軸封装置の第５の実施
例を示す。この実施例において、前記第２の実施例と異
なるのは、シール材４ａの摺動面に大気側と連通した溝
１４を形成した点にある。この実施例によれば、基本的
には前述した第２の実施例と同様の作用効果を得ること
ができる他、摺動面側に形成される圧力分布が、溝１４
の部分まで大気圧となるので、シール材４ａのスリーブ
摺動面側の浮上力が溝のない場合に比較してさらに増大
するので摩擦力が低減し安定した摺動特性が得られる。
また、摺動面の空気膜の剛性が高くなり、スリーブ振動
に対してもシール材４ａが非接触状態で作動できるので
シール材４ａの長寿命化が達成できる。さらに、溝を設
けたことにより、摺動面を通過する空気量が増大し、冷
却性が向上する。その結果、運転範囲（高周速域まで）
を広げることができる。FIG. 7 shows a fifth embodiment of the shaft sealing device according to the present invention. This embodiment differs from the second embodiment in that a groove 14 communicating with the atmosphere side is formed on the sliding surface of the sealing material 4a. According to this embodiment, basically, the same effect as that of the second embodiment described above can be obtained, and in addition, the pressure distribution formed on the sliding surface side has the groove 14
Since the atmospheric pressure is reached up to the portion, the levitation force of the sealing material 4a on the sleeve sliding surface side is further increased as compared with the case where there is no groove, so the frictional force is reduced and stable sliding characteristics can be obtained.
Further, the rigidity of the air film on the sliding surface is increased, and the sealing material 4a can operate in a non-contact state even with respect to the sleeve vibration, so that the life of the sealing material 4a can be extended. Further, by providing the groove, the amount of air passing through the sliding surface is increased and the cooling performance is improved. As a result, operating range (up to high peripheral speed range)
Can be extended.
【００３８】図８に本発明による軸封装置の第６の実施
例を示す。この実施例において、前記第２の実施例と異
なる点は、シール材４ａの大気側端面とカバー８とで構
成される間隙１３に設けた減圧手段をシール材の大気側
端面に設けたラビリンス溝１５で形成した点にある。ラ
ビリンス溝１５をシール材４ａ側に設けているが、カバ
ー８側に設けても同等の作用効果があり、特に限定しな
い。また、シール材４ａ及びカバー８側の両方に設けて
も良い。FIG. 8 shows a sixth embodiment of the shaft sealing device according to the present invention. This embodiment differs from the second embodiment in that a labyrinth groove provided with a pressure reducing means provided in a gap 13 formed by the end surface of the seal material 4a on the atmosphere side and the cover 8 is provided on the end surface of the seal material on the atmosphere side. There is a point formed in 15. Although the labyrinth groove 15 is provided on the seal material 4a side, providing the labyrinth groove 15 on the cover 8 side has the same effect and is not particularly limited. Further, it may be provided on both the seal material 4a and the cover 8 side.
【００３９】この実施例によれば、基本的には前述した
第２の実施例と同様の作用効果を得ることができる他、
減圧手段がラビリンス溝１５で構成されているので、シ
ール材とカバーが非接触状態で減圧効果が得られ、径方
向の動きがよりスムーズになる。ラビリンス溝を設ける
こによりシール材の端面での表面積が増大し放熱しやす
くなり、シール材の温度低減に有効である。According to this embodiment, basically, the same effect as that of the second embodiment described above can be obtained, and
Since the depressurizing means is constituted by the labyrinth groove 15, the depressurizing effect can be obtained in the non-contact state between the sealing material and the cover, and the radial movement becomes smoother. By providing the labyrinth groove, the surface area of the end surface of the sealing material is increased and heat is easily radiated, which is effective in reducing the temperature of the sealing material.
【００４０】なお、この実施例では、ラビリンス溝の段
数を２列にした例を示したが、その列の数はシール材４
ａの径方向の幅及び負圧条件（圧力）で決まるので、図
示実施例に限定されるものではない。In this embodiment, the labyrinth groove has two rows, but the number of rows is equal to that of the sealing material 4.
Since it is determined by the radial width of a and the negative pressure condition (pressure), it is not limited to the illustrated embodiment.
【００４１】図９に本発明による軸封装置の第７の実施
例を示す。この実施例において、前記第２の実施例と異
なる点は、シール材４ａの大気側端面とカバー８とで構
成される間隙１３に設けた減圧手段をシール材の反大気
側に入れたバネ１６により、シール材４ａの大気側端面
をカバー８に押し付け接触させて形成した点にある。こ
の実施例によれば、基本的には前述した第２の実施例と
同様の作用効果を得ることができる他、バネ１６により
押し付けられているのでカバー面にシール材４ａが倣っ
て取り付けられるので組立初期から安定した密封性能が
得られやすい。バネは周方向に複数個配置されている。
また、バネはコイルバネ，板バネいずれでも良い。バネ
材質は耐食性の点からＳＵＳ３０４等が良い。FIG. 9 shows a seventh embodiment of the shaft sealing device according to the present invention. This embodiment differs from the second embodiment in that a pressure reducing means provided in a gap 13 formed by the atmosphere-side end surface of the seal material 4a and the cover 8 is provided with a spring 16 in which the pressure reducing means is provided on the anti-air side of the seal material. Thus, the end surface of the sealant 4a on the atmosphere side is pressed against and brought into contact with the cover 8. According to this embodiment, basically, the same effect as that of the second embodiment described above can be obtained, and since it is pressed by the spring 16, the seal material 4a is attached to the cover surface in a copying manner. It is easy to obtain stable sealing performance from the initial stage of assembly. A plurality of springs are arranged in the circumferential direction.
Further, the spring may be either a coil spring or a leaf spring. The spring material is preferably SUS304 or the like from the viewpoint of corrosion resistance.
【００４２】図１０に本発明による軸封装置の第８の実
施例を示す。この実施例において、前記第２の実施例と
異なる点は、シール材４ａの大気側端面とカバー８とで
構成される間隙１３に設けた減圧手段をシール材の径方
向の接触幅を反大気側(幅Ａ)よりも大気側（幅Ｂ）の方
を広くすることにより形成した点にある。FIG. 10 shows an eighth embodiment of the shaft sealing device according to the present invention. This embodiment is different from the second embodiment in that the pressure reducing means provided in the gap 13 formed by the atmosphere-side end surface of the seal material 4a and the cover 8 has a contact width in the radial direction of the seal material which is anti-atmosphere. It is formed by making the atmosphere side (width B) wider than the side (width A).
【００４３】この実施例によれば、基本的には前述した
第２の実施例と同様の作用効果を得ることができる他、
シール材４ａの軸方向の断面形状が非対称であるため、
組み込み時のシール材４ａの装着ミスが防止できる。According to this embodiment, basically, the same operation and effect as those of the above-mentioned second embodiment can be obtained.
Since the axial cross-sectional shape of the sealing material 4a is asymmetric,
It is possible to prevent a mistake in mounting the sealing material 4a during assembly.
【００４４】なお、シール材４ａの軸方向の断面形状
は、シール材の径方向の接触幅の関係がＢ＞Ａを満足す
る断面形状であれば特に限定するものではない。The cross-sectional shape of the sealing material 4a in the axial direction is not particularly limited as long as the radial contact width of the sealing material satisfies the relation B> A.
【００４５】次に、本発明の軸封装置を立軸雨水排水ポ
ンプに適用した場合について述べる。Next, the case where the shaft sealing device of the present invention is applied to a vertical shaft rainwater drainage pump will be described.
【００４６】即ち、立軸雨水排水ポンプは図１１に示す
ように、ポンプ主軸１と、ポンプ主軸１の下部に固定さ
れたランナ１９と、ポンプ主軸１が貫通するケーシング
貫通部１７と、該ケーシング貫通部１７に固定されてい
る本実施例の軸封装置３とを有している。この軸封装置
は、金属リング２ｂと、シールケース６と、シール材４
ａと、シールケーシング１０，シール材４ａの大気側端
面とカバー８とで構成される間隙１３に減圧手段を備え
ている。That is, as shown in FIG. 11, the vertical axis rainwater drainage pump has a pump main shaft 1, a runner 19 fixed to the lower part of the pump main shaft 1, a casing penetrating portion 17 through which the pump main shaft 1 penetrates, and the casing penetrating part. The shaft sealing device 3 of this embodiment is fixed to the portion 17. This shaft sealing device includes a metal ring 2b, a seal case 6, and a sealing material 4
A pressure reducing means is provided in a gap 13 formed by a, the seal casing 10, the end surface of the seal material 4a on the atmosphere side, and the cover 8.
【００４７】減圧手段は図１に示されているように、２
分割されたシール材の大気側端面のそれぞれのに円周溝
を加工し、この溝にＯリング１２等の弾性体（ゴム等）
を装着固定し、装着固定されたＯリング１２がカバー８
と接触するように配置されている。シールケーシング１
０は図１のように筒形をなしており、図１において、左
側が下側になるように固定されている。したがって、シ
ールケース６の上にシール材４ａが配置されている。シ
ール段数は図５に示すように２段としている。この実施
例によれば、シール材の大気側端面とこれと対向するカ
バー面とで構成される隙間に減圧手段を設けているの
で、基本的には第１〜第８の実施例と同等の作用効果を
得ることができる。As shown in FIG. 1, the depressurizing means is 2
A circumferential groove is formed on each of the divided end faces of the sealing material on the atmosphere side, and an elastic body (rubber or the like) such as an O-ring 12 is formed in this groove.
The attached O-ring 12 covers the cover 8
It is placed in contact with. Seal casing 1
0 has a cylindrical shape as shown in FIG. 1, and is fixed so that the left side is the lower side in FIG. Therefore, the seal material 4a is arranged on the seal case 6. The number of sealing steps is two, as shown in FIG. According to this embodiment, since the pressure reducing means is provided in the gap formed by the atmosphere-side end surface of the sealing material and the cover surface facing this, basically the same as in the first to eighth embodiments. The effect can be obtained.
【００４８】更に、本発明の軸封装置を横軸雨水排水ポ
ンプに適用した場合について述べる。Further, the case where the shaft sealing device of the present invention is applied to a horizontal shaft rainwater drainage pump will be described.
【００４９】図１２に示すように、ポンプ主軸１と、ポ
ンプ主軸１の中央部に固定されたランナ１９ａと、ポン
プ主軸１が貫通するケーシング貫通部１７ａ，１７ｂ
と、該ケーシング貫通部１７ａ，１７ｂに固定されてい
る本実施例の軸封装置３とを有している。ポンプ主軸１
は両端部に配置したころがり軸受２１により支持されて
いる。また、一端にカップリング２０が固定されてい
る。この軸封装置３は、金属リング２ｂと、シールケー
ス６と、シール材４ａと、シールケーシング１０と、シ
ール材４ａの大気側端面とカバー８とで構成される間隙
１３に減圧手段を備えている。As shown in FIG. 12, the pump main shaft 1, the runner 19a fixed to the central portion of the pump main shaft 1, and the casing penetrating portions 17a and 17b through which the pump main shaft 1 penetrates.
And the shaft sealing device 3 of the present embodiment fixed to the casing penetrating portions 17a and 17b. Pump spindle 1
Are supported by rolling bearings 21 arranged at both ends. The coupling 20 is fixed to one end. This shaft sealing device 3 is provided with a pressure reducing means in a gap 13 formed by a metal ring 2b, a seal case 6, a seal material 4a, a seal casing 10, and an atmosphere-side end surface of the seal material 4a and a cover 8. There is.
【００５０】減圧手段は図１に示されているように、２
分割されたシール材の大気側端面のそれぞれのに円周溝
を加工し、この溝にＯリング１２等の弾性体（ゴム等）
を装着固定し、装着固定されたＯリング１２がカバー８
と接触するように配置されている。シール段数は図５に
示すように２段としている。As shown in FIG. 1, the depressurizing means is 2
A circumferential groove is formed on each of the divided end faces of the sealing material on the atmosphere side, and an elastic body (rubber or the like) such as an O-ring 12 is formed in this groove.
The attached O-ring 12 covers the cover 8
It is placed in contact with. The number of sealing steps is two, as shown in FIG.
【００５１】この実施例によれば、シール材の大気側端
面とこれと対向するカバー面とで構成される隙間に減圧
手段を設けているので、基本的には第１〜第８の実施例
と同等の作用効果を得ることができる。According to this embodiment, since the depressurizing means is provided in the gap formed by the end surface of the sealing material on the atmosphere side and the cover surface facing this, basically, the first to eighth embodiments. It is possible to obtain the same effect as.
【００５２】これに加え、外部からの給水をしなくても
長時間の負圧運転が行えるポンプが提供できる。In addition to this, it is possible to provide a pump capable of performing negative pressure operation for a long time without supplying water from the outside.
【００５３】以上説明してきたようにこのように形成さ
れた軸封装置であると、シール材の大気側端面とこれと
対向するカバー面とで構成される隙間に設けた減圧手段
により、シール材の摺動面とシール材の外周部とで圧力
差が生じ、シール材が負圧になると摺動面から浮上する
ように作用するので摩擦力が減少し温度上昇がほとんど
なくなり、外部からの給水をしなくても安定して長時間
の負圧条件での運転が行えるのである。一方、セグメン
ト型軸封装置（シール材の合わせ目がゼロの場合）の漏
水は端部および摺動部の両方から生じる。この場合、端
部の方が摺動部よりも多く漏水する。端部からの漏水に
対して減圧手段が正圧作用時には抵抗となるので端部か
らの漏水量が減少する。その結果、全漏水量が減少し安
定した密封性能が得られる。As described above, in the shaft sealing device thus formed, the sealing material is provided by the pressure reducing means provided in the gap formed by the end surface on the atmosphere side of the sealing material and the cover surface facing the sealing material. When there is a pressure difference between the sliding surface and the outer periphery of the sealing material, and the sealing material becomes a negative pressure, it acts so as to float above the sliding surface, so the frictional force decreases and the temperature rises almost completely. It is possible to operate stably under a negative pressure condition for a long time without performing the operation. On the other hand, the water leakage of the segment type shaft seal device (when the joint of the sealing material is zero) occurs from both the end portion and the sliding portion. In this case, the end portion leaks more water than the sliding portion. When the positive pressure acts on the water leakage from the end portion, the decompression means acts as a resistance, so that the amount of water leakage from the end portion decreases. As a result, the total amount of water leakage is reduced and stable sealing performance can be obtained.
【００５４】これに加え、外部からの給水をしなくても
長時間の負圧運転が行えるポンプが得られるのである。In addition to this, it is possible to obtain a pump capable of performing a negative pressure operation for a long time without supplying water from the outside.
【００５５】[0055]
【発明の効果】以上説明してきたように本発明によれ
ば、漏水量が少なく、かつシール材の潤滑水をポンプの
外部から給水することなく、長時間の負圧運転を安定し
て行うことができる軸封装置を得ることができる。As described above, according to the present invention, the amount of water leakage is small, and the negative pressure operation is stably performed for a long time without supplying the lubricating water for the sealing material from the outside of the pump. It is possible to obtain a shaft sealing device capable of
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明による軸封装置の第１の実施例を示す縦
断面図。FIG. 1 is a vertical cross-sectional view showing a first embodiment of a shaft sealing device according to the present invention.
【図２】（ａ)，(ｂ）は減圧手段がない場合の負圧時の
シール材摺動面とシール材外周部との圧力分布を示す説
明図。2 (a) and 2 (b) are explanatory views showing a pressure distribution between a seal material sliding surface and a seal material outer peripheral portion at the time of negative pressure when there is no pressure reducing means.
【図３】本発明による軸封装置の第２の実施例を示す縦
断面図。FIG. 3 is a vertical sectional view showing a second embodiment of the shaft sealing device according to the present invention.
【図４】本発明の軸封装置と従来技術の軸封装置とのシ
ール材の温度上昇を各々に測定した結果を示す説明図。FIG. 4 is an explanatory diagram showing the results of measuring the temperature rises of the sealing materials of the shaft sealing device of the present invention and the shaft sealing device of the prior art.
【図５】本発明による軸封装置の第３の実施例を示す縦
断面図。FIG. 5 is a longitudinal sectional view showing a third embodiment of the shaft sealing device according to the present invention.
【図６】本発明による軸封装置の第４の実施例を示す２
分割シール材の周方向の配置状況を示す説明図。FIG. 6 shows a second embodiment of the shaft sealing device according to the present invention 2
Explanatory drawing which shows the circumferential arrangement | positioning condition of a division | segmentation sealing material.
【図７】本発明による軸封装置の第５の実施例を示す縦
断面図。FIG. 7 is a vertical cross-sectional view showing a fifth embodiment of the shaft sealing device according to the present invention.
【図８】本発明による軸封装置の第６の実施例を示す縦
断面図。FIG. 8 is a vertical sectional view showing a sixth embodiment of the shaft sealing device according to the present invention.
【図９】本発明による軸封装置の第７の実施例を示す縦
断面図。FIG. 9 is a vertical cross-sectional view showing a seventh embodiment of the shaft sealing device according to the present invention.
【図１０】本発明による軸封装置の第８の実施例を示す
縦断面図。FIG. 10 is a longitudinal sectional view showing an eighth embodiment of the shaft sealing device according to the present invention.
【図１１】本発明による軸封装置を適用した立軸排水ポ
ンプを示す縦断面図。FIG. 11 is a vertical cross-sectional view showing a vertical shaft drainage pump to which the shaft sealing device according to the present invention is applied.
【図１２】本発明による軸封装置を適用した横軸排水ポ
ンプを示す縦断面図。FIG. 12 is a vertical sectional view showing a horizontal shaft drainage pump to which the shaft sealing device according to the present invention is applied.
１…ポンプ主軸、２…スリーブ、２ａ…超硬合金溶射皮
膜、２ｂ…金属リング、３…軸封装置、４，４ａ…シー
ル材、５…ガータスプリング、６…シールケース、７…
円周溝、８…カバー、９…回り止めピン、１０…シール
ケーシング、１１…溝、１２…Ｏリング、１３…シール
材の大気側端面とこれと対向するカバー面とで構成され
る隙間、１３ａ…合わせ目部、１４…大気側と連通する
溝、１５…ラビリンス溝、１６…バネ、１７，１７ａ，
１７ｂ…ケーシング貫通部、１８…ポンプケーシング、
１９，１９ａ…ランナ、２０…カップリング、２１…こ
ろがり軸受。DESCRIPTION OF SYMBOLS 1 ... Pump main shaft, 2 ... Sleeve, 2a ... Cemented carbide spray coating, 2b ... Metal ring, 3 ... Shaft sealing device, 4, 4a ... Seal material, 5 ... Garter spring, 6 ... Seal case, 7 ...
Circumferential groove, 8 ... Cover, 9 ... Anti-rotation pin, 10 ... Seal casing, 11 ... Groove, 12 ... O-ring, 13 ... Gap constituted by the atmosphere side end surface of the sealing material and the cover surface facing this, 13a ... Seam portion, 14 ... Groove communicating with the atmosphere side, 15 ... Labyrinth groove, 16 ... Spring, 17, 17a,
17b ... Casing penetration, 18 ... Pump casing,
19, 19a ... Runner, 20 ... Coupling, 21 ... Rolling bearing.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−159086（ＪＰ，Ａ) 特開 平８−135796（ＪＰ，Ａ) 実開 平３−39560（ＪＰ，Ｕ) 実開 平３−92569（ＪＰ，Ｕ) 実開 昭58−53864（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F04D 29/10 F16J 15/18 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-159086 (JP, A) JP-A-8-135796 (JP, A) Actually open 3-39560 (JP, U) Actually open 3- 92569 (JP, U) Actual development Sho 58-53864 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) F04D 29/10 F16J 15/18
Claims (7)
ーブの外周位置に配置されるシールケースと、該シール
ケース及び該スリーブの間に周方向に沿って複数配設さ
れたセグメント状のシール材を配置したセグメント型軸
封装置において、スリーブを超硬合金製の筒状部材と
し、シール材をセラミックスとし、該シール材の摺動面
を楕円形状とし、該シール材の大気側側面と該大気側端
面と対向するカバー面とで構成される隙間に減圧手段を
設けたことを特徴とするセグメント型軸封装置。1. A seal case having a sleeve fixed to a pump main shaft, the seal case being arranged at an outer peripheral position of the sleeve, and a plurality of segment-shaped seal members arranged circumferentially between the seal case and the sleeve. In the segment type shaft sealing device, the sleeve is a cylindrical member made of cemented carbide, the sealing material is ceramics, the sliding surface of the sealing material is elliptical, and the atmosphere side surface of the sealing material and the atmosphere are A segment type shaft sealing device, characterized in that a pressure reducing means is provided in a gap formed between a side end surface and a cover surface facing the side end surface.
ーブの外周位置に配置されるシールケースと、該シール
ケース及び該スリーブの間に周方向に沿って複数配設さ
れたセグメント状のシール材を配置したセグメント型軸
封装置において、スリーブを超硬合金製の筒状部材と
し、シール材をセラミックスとし、該シール材の摺動面
を楕円形状とし、該シール材の摺動面をポンプ主軸の停
止時、該スリーブ摺動面に接触させ、かつ、該シール材
の大気側側面と該大気側端面と対向するカバー面とで構
成される隙間に減圧手段を設けたことを特徴とするセグ
メント型軸封装置。2. A seal case in which a sleeve is fixed to a pump main shaft and arranged at an outer peripheral position of the sleeve, and a plurality of segment-shaped seal members arranged in the circumferential direction between the seal case and the sleeve. In a segment type shaft sealing device in which a sleeve is arranged, the sleeve is a cylindrical member made of cemented carbide, the sealing material is ceramics, the sliding surface of the sealing material is elliptical, and the sliding surface of the sealing material is the pump main shaft. Segment is characterized in that it is brought into contact with the sliding surface of the sleeve at the time of stop, and a pressure reducing means is provided in a gap defined by the atmospheric side surface of the sealing material and the cover surface facing the atmospheric side end surface. Mold shaft sealing device.
ーブの外周位置に配置されるシールケースと、該シール
ケース及び該スリーブの間に周方向に沿って複数配設さ
れたセグメント状のシール材を配置したセグメント型軸
封装置において、スリーブを超硬合金製の筒状部材と
し、シール材をセラミックスとし、該シール材の摺動面
を楕円形状とし、該シール材の大気側側面と該大気側端
面と対向するカバー面とで構成される隙間に減圧手段を
設け、かつ該シール材摺動面に大気側と連通した溝を構
成したことを特徴とするセグメント型軸封装置。3. A seal case in which a sleeve is fixed to a pump main shaft and arranged at an outer peripheral position of the sleeve, and a plurality of segment-shaped seal materials arranged between the seal case and the sleeve in the circumferential direction. In the segment type shaft sealing device, the sleeve is a cylindrical member made of cemented carbide, the sealing material is ceramics, the sliding surface of the sealing material is elliptical, and the atmosphere side surface of the sealing material and the atmosphere are A segment type shaft sealing device characterized in that a pressure reducing means is provided in a gap defined by a side end surface and a cover surface facing the side end surface, and a groove communicating with the atmosphere side is formed on the sealing material sliding surface.
ーブの外周位置に配置されるシールケースと、該シール
ケース及び該スリーブの間に周方向に沿って複数配設さ
れたセグメント状のシール材を配置したセグメント型軸
封装置において、スリーブを超硬合金製の筒状部材と
し、シール材をセラミックスとし、該シール材の摺動面
を楕円形状とし、該シール材の摺動面をポンプ主軸の停
止時、該スリーブ摺動面に接触させ、かつ、該シール材
の大気側側面と該大気側端面と対向するカバー面とで構
成される隙間に減圧手段を設け、かつ該シール材摺動面
に大気側と連通した溝を構成したことを特徴とするセグ
メント型軸封装置。4. A seal case, in which a sleeve is fixed to a pump main shaft, is arranged at an outer peripheral position of the sleeve, and a plurality of segment-shaped seal members are arranged between the seal case and the sleeve along the circumferential direction. In a segment type shaft sealing device in which a sleeve is arranged, the sleeve is a cylindrical member made of cemented carbide, the sealing material is ceramics, the sliding surface of the sealing material is elliptical, and the sliding surface of the sealing material is the pump main shaft. Is brought into contact with the sleeve sliding surface at the time of stop, and a depressurizing means is provided in the gap formed by the atmosphere side surface of the sealing material and the cover surface facing the atmosphere side end surface, and the sealing material sliding A segment type shaft sealing device, characterized in that a groove is formed on the surface thereof so as to communicate with the atmosphere side.
減圧手段が抵抗体を装着、又は圧損が大きくなるように
構成したことを特徴とするセグメント型軸封装置。5. A segment type shaft sealing device, characterized in that the pressure reducing means according to any one of claims 1 to 4 is configured such that a resistor is attached or pressure loss is increased.
セラミックスは炭化珪素又は四ふっ化エチレン樹脂を含
浸した炭化珪素としたことを特徴とするセグメント型軸
封装置。6. A segment type shaft sealing device, wherein the ceramic according to any one of claims 1 to 4 is silicon carbide or silicon carbide impregnated with a tetrafluoroethylene resin.
スリーブは少なくともその表面を四ふっ化エチレン樹脂
を含浸した超硬合金製の筒状部材または超硬合金製皮膜
としたことを特徴とするセグメント型軸封装置。7. The sleeve according to claim 1 , wherein at least the surface of the sleeve is a cemented carbide tubular member or a cemented carbide coating impregnated with a tetrafluoroethylene resin. A segment type shaft seal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24502297A JP3440777B2 (en) | 1997-09-10 | 1997-09-10 | Segment type shaft sealing device and drain pump provided with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24502297A JP3440777B2 (en) | 1997-09-10 | 1997-09-10 | Segment type shaft sealing device and drain pump provided with the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1182749A JPH1182749A (en) | 1999-03-26 |
| JP3440777B2 true JP3440777B2 (en) | 2003-08-25 |
Family
ID=17127419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24502297A Expired - Fee Related JP3440777B2 (en) | 1997-09-10 | 1997-09-10 | Segment type shaft sealing device and drain pump provided with the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3440777B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003240125A (en) * | 2002-02-13 | 2003-08-27 | Shin-Toyo Kikai Kogyo Co Ltd | Shaft sealing device |
| DE602007012991D1 (en) * | 2007-01-04 | 2011-04-21 | Skf Ab | Sealing arrangement between a constant velocity joint and a hub bearing unit of a motor vehicle wheel |
| JP2013053542A (en) * | 2011-09-02 | 2013-03-21 | Mitsubishi Heavy Ind Ltd | Seal device |
| FR2992392B1 (en) * | 2012-06-25 | 2014-07-11 | Jspm | PASSIVE STOP SEALING DEVICE FOR SHAFT JOINT SYSTEM OF PRIMARY MOTOR PUMP GROUP |
-
1997
- 1997-09-10 JP JP24502297A patent/JP3440777B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1182749A (en) | 1999-03-26 |
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