JPH0448374Y2 - - Google Patents
Info
- Publication number
- JPH0448374Y2 JPH0448374Y2 JP1987009933U JP993387U JPH0448374Y2 JP H0448374 Y2 JPH0448374 Y2 JP H0448374Y2 JP 1987009933 U JP1987009933 U JP 1987009933U JP 993387 U JP993387 U JP 993387U JP H0448374 Y2 JPH0448374 Y2 JP H0448374Y2
- Authority
- JP
- Japan
- Prior art keywords
- sliding
- machine
- flushing
- seal
- annular space
- 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
Links
- 238000011010 flushing procedure Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 18
- 239000000314 lubricant Substances 0.000 claims description 2
- 230000001050 lubricating effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Mechanical Sealing (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、軸封技術に係るメカニカルシールで
あつて、摺動面近傍への密封対象流体の侵入を排
除するフラツシング機能をメカニカルシール自身
が行なうようになすものである。[Detailed description of the invention] [Field of industrial application] The present invention is a mechanical seal related to shaft sealing technology, in which the mechanical seal itself has a flushing function that eliminates the intrusion of the fluid to be sealed into the vicinity of the sliding surface. Do what you do.
従来から、第４図に示すように、それぞれ回転
軸５０外周に気密的に装着された回転環５１とハ
ウジング５２内周に気密的に装着された固定環５
３を密接摺動させてなる構造の一対のメカニカル
シールM1，M2を軸方向に並んで設けたものにお
いては、前記回転環５１と固定環５３の摺動面を
潤滑するために、該摺動面の外周側に区画形成さ
れる環状空間５４に潤滑液a1を循環供給させると
ともに、機内の密封対象流体が機内側メカニカル
シールM2の内周隙間５７に侵入して付着固化す
るのを阻止する目的で、この機内側メカニカルシ
ールM2の背面側に、上記潤滑液a1とは異質のフ
ラツシング液a2を供給路５５を介して供給し、前
記内周隙間５７に侵入しようとする密封対象流体
を押し戻すようにしている。
Conventionally, as shown in FIG. 4, a rotating ring 51 is airtightly attached to the outer periphery of a rotating shaft 50, and a fixed ring 5 is airtightly attached to the inner periphery of a housing 52.
In the case where a pair of mechanical seals M 1 and M 2 having a structure in which the seals M 1 and M 2 are closely slid together are provided side by side in the axial direction, in order to lubricate the sliding surfaces of the rotating ring 51 and the stationary ring 53, The lubricating fluid A1 is circulated and supplied to the annular space 54 defined on the outer circumferential side of the sliding surface, and the fluid to be sealed inside the machine enters the inner circumferential gap 57 of the mechanical seal M2 inside the machine and adheres and solidifies. In order to prevent this, flushing liquid A2 , which is different from the lubricating liquid A1 , is supplied to the back side of the machine-inside mechanical seal M2 through the supply path 55 to prevent it from entering the inner circumferential gap 57. The fluid to be sealed is pushed back.
しかし、上記従来構造によると、両メカニカル
シールM1，M2間の環状空間５４に潤滑液a1を循
環供給させる加圧循環装置およびその配管系のほ
か、機内側メカニカルシールM2の背面側に所定
圧でフラツシング液a2を供給するための供給装置
５６を装備する必要があり、構造の複雑化および
大型化を来していた。
However, according to the above conventional structure, in addition to the pressurized circulation device and its piping system that circulate and supply the lubricating liquid a 1 to the annular space 54 between the two mechanical seals M 1 and M 2 , the back side of the mechanical seal M 2 inside the machine It is necessary to equip the pump with a supply device 56 for supplying the flushing liquid A2 at a predetermined pressure, resulting in a complicated and large-sized structure.
本考案は、このような事情から、メカニカルシ
ールにフラツシング機能を兼備させることによつ
て構造の簡易化および小型化を図るものである。 In view of these circumstances, the present invention aims to simplify and downsize the structure by providing a mechanical seal with a flushing function.
上記課題を解決するため、本考案に係るフラツ
シング機構を兼ねたメカニカルシールは、軸方向
に並ぶ一対のメカニカルシールの摺動シール部の
外周側に区画形成される環状空間に、潤滑液兼用
フラツシング液を循環供給するとともに、上記環
状空間における上記潤滑液兼用フラツシング液の
加圧導入部の内周に位置する機内側メカニカルシ
ールの摺動シール部に、その摺動面の外径縁から
幅方向中央部より内径側に達する加圧溝を設け、
前記摺動シール部から機内側へ、上記潤滑液兼用
フラツシング液を所定流量で常時漏洩させてなる
構成とした。
In order to solve the above problems, the mechanical seal that also serves as a flushing mechanism according to the present invention has a flushing liquid that also serves as a lubricant in an annular space defined on the outer periphery of the sliding seal portion of a pair of mechanical seals that are aligned in the axial direction. At the same time, the fluid is circulated and supplied from the outer diameter edge of the sliding surface to the widthwise center of the sliding seal part of the in-machine mechanical seal located on the inner periphery of the pressurized introduction part of the lubricating fluid and flushing fluid in the annular space. A pressure groove is provided that reaches the inner diameter side of the
The structure is such that the flushing liquid that also serves as a lubricating liquid is constantly leaked at a predetermined flow rate from the sliding seal portion to the inside of the machine.
本考案によると、機内側メカニカルシールの摺
動シール部に、その摺動面の外径縁からその幅方
向中央部より内径側に達する加圧溝を設けたこと
から、この加圧溝内に、環状空間内における加圧
導入部に圧注された潤滑液兼用フラツシング液の
圧力が摺動シール部を離間させる顕著な開力とし
て作用し、環状空間に循環供給される潤滑液兼用
フラツシング液は、この離間した摺動シール部か
ら所定の流量で機内側へ漏洩し、機内側メカニカ
ルシールの内周隙間へ侵入しようとする密封対象
流体を機内へ押し戻す。
According to the present invention, a pressurizing groove is provided in the sliding seal portion of the in-machine mechanical seal, which extends from the outer diameter edge of the sliding surface to the inner diameter side from the center in the width direction. The pressure of the lubricant-cum-flushing fluid injected into the pressurized introduction part in the annular space acts as a significant opening force that separates the sliding seal part, and the lubricant-cum-flushing fluid is circulated and supplied to the annular space. The fluid to be sealed leaks from this spaced apart sliding seal portion to the inside of the machine at a predetermined flow rate and pushes back into the machine the fluid to be sealed that is about to enter the inner peripheral gap of the inside mechanical seal.
以下、本考案を、第１図ないし第３図に示す一
実施例を参照しながら説明する。
Hereinafter, the present invention will be explained with reference to an embodiment shown in FIGS. 1 to 3.
図中１は機筐２の軸孔部に挿通した回転軸であ
り、該機筐２の端部には大気側Ａの軸周に筒状の
シールハウジング３と端環４を気密的に固設して
ある。５は回転軸１の外周に気密的かつ軸方向移
動自在に装着した回転環６と、端環４の端部内周
に気密的に固定した固定環７を密接摺動してシー
ル部８を形成してなる大気側メカニカルシールで
あり、また、９は回転軸１の外周に気密的かつ軸
方向移動自在に装着した回転環１０と、機筐２の
端部内周に気密的に固定した固定環１１を密接摺
動してシール部１２を形成してなる機内側メカニ
カルシールであり、両メカニカルシール５，９
は、軸方向に並列した位置関係にある。 In the figure, 1 is a rotating shaft inserted into the shaft hole of the machine casing 2, and at the end of the machine casing 2, a cylindrical seal housing 3 and an end ring 4 are hermetically fixed around the shaft on the atmospheric side A. It has been set up. 5 forms a seal portion 8 by closely sliding a rotating ring 6 attached to the outer periphery of the rotating shaft 1 so as to be airtight and movable in the axial direction, and a fixed ring 7 airtightly fixed to the inner periphery of the end of the end ring 4. 9 is a rotary ring 10 airtightly attached to the outer periphery of the rotating shaft 1 and movable in the axial direction; and a fixed ring 9 airtightly fixed to the inner periphery of the end of the machine casing 2. This is an in-machine mechanical seal in which a seal portion 12 is formed by closely sliding the mechanical seals 5 and 9.
are in a parallel positional relationship in the axial direction.
上記機内側メカニカルシール９は、第２図およ
び第３図に示すように、固定環１１の摺動面１４
に、その外径縁から該摺動面１４の幅方向中央部
０よりも内径位置まで延びる複数の加圧溝１５が
周方向等配状に設けられている。また、両メカニ
カルシール５，９によつて摺動シール部８，１２
の外周側に区画形成された環状空間Ｃには、機内
側メカニカルシール９の摺動シール部１２の外周
側である加圧導入部１８に臨んでシールハウジン
グ３に開設した導入ポート１６と、大気側メカニ
カルシール５の摺動シール部８に臨んでシールハ
ウジング３に開設した排出ポート１７を介して、
図示しない外部の加圧循環装置から潤滑液兼用フ
ラツシング液ａが所定圧力で循環供給されてい
る。なお、潤滑液兼用フラツシング液ａとして
は、当然ながら、機内Ｂ側へ漏洩して密封対象流
体と混合しても問題のない流体が選定使用される
ものである。 As shown in FIGS. 2 and 3, the in-machine mechanical seal 9 has a sliding surface 14 of a fixed ring 11.
A plurality of pressurizing grooves 15 are provided equidistantly in the circumferential direction, extending from the outer radial edge to the inner radial position of the widthwise central portion 0 of the sliding surface 14. In addition, the sliding seal portions 8 and 12 are provided by both mechanical seals 5 and 9.
An annular space C defined on the outer periphery side includes an introduction port 16 opened in the seal housing 3 facing the pressure introduction part 18 which is the outer periphery side of the sliding seal part 12 of the inside mechanical seal 9, and Through a discharge port 17 opened in the seal housing 3 facing the sliding seal portion 8 of the side mechanical seal 5,
Flushing liquid a, which also serves as a lubricating liquid, is circulated and supplied at a predetermined pressure from an external pressurized circulation device (not shown). Note that as the flushing liquid a that also serves as a lubricating liquid, a fluid that does not cause any problem even if it leaks into the machine B side and mixes with the fluid to be sealed is naturally selected and used.
本実施例は以上の構成になり、外部の加圧循環
装置から導入ポート１６を介して環状空間Ｃの加
圧導入部１８に加圧供給された潤滑液兼用フラツ
シング液ａは、機内側メカニカルシール９の摺動
シール部１２を潤滑・冷却した後、上記環状空間
Ｃ内を大気側メカニカルシール５側へ流動し、そ
の摺動シール部８を潤滑・冷却して排出ポート１
７から再び加圧循環装置側へ還流される。ここ
で、機内側メカニカルシール９の摺動シール部１
２において固定環１１の摺動面１４に設けられた
複数の加圧溝１５は、摺動面１４の幅方向中央部
０よりも内径位置に達しているので、導入ポート
１６から摺動シール部８の外周空間である加圧導
入部１８に圧注される潤滑液兼用フラツシング液
ａの圧力が、加圧溝１５に摺動面１３，１４に対
する開力Ｐとして効果的に作用し、機内Ｂ側への
漏洩を積極的に生じさせる。このため、環状空間
Ｃに循環供給される潤滑液兼用フラツシング液ａ
の一部は、摺動シール部１２から所定の流量で機
内側メカニカルシール９の内周隙間Ｄに流入し、
この内周隙間Ｄへ侵入しようとする密封対象流体
を機内Ｂへ押し戻し、この密封対象流体が摺動シ
ール部１２の内周部に付着固化するのを防止する
ので、先の第４図に示す従来のメカニカルシール
におけるフラツシング機構と同様の機能を奏す
る。 The present embodiment has the above-described configuration, and the lubricant-cum-flushing liquid a, which is supplied under pressure from the external pressurized circulation device to the pressurized introduction part 18 of the annular space C through the introduction port 16, is supplied to the mechanical seal inside the machine. After lubricating and cooling the sliding seal portion 12 of No. 9, the flow flows through the annular space C toward the atmospheric side mechanical seal 5, and lubricates and cools the sliding seal portion 8 of the exhaust port 1.
7, the water is returned to the pressurized circulation system. Here, the sliding seal portion 1 of the in-machine mechanical seal 9
2, the plurality of pressurizing grooves 15 provided in the sliding surface 14 of the fixed ring 11 reach an inner diameter position than the width direction center part 0 of the sliding surface 14, so that the sliding seal portion can be removed from the introduction port 16. The pressure of the lubricant-cum-flushing liquid a that is injected into the pressurized introduction part 18, which is the outer circumferential space of 8, effectively acts on the pressurized groove 15 as an opening force P against the sliding surfaces 13 and 14, and proactively cause leakage to For this reason, the lubricant-cum-flushing liquid a is circulated and supplied to the annular space C.
Flows into the inner circumferential gap D of the machine-inside mechanical seal 9 from the sliding seal portion 12 at a predetermined flow rate,
The fluid to be sealed that tries to enter this inner circumferential gap D is pushed back into the machine B, and this fluid to be sealed is prevented from adhering and solidifying to the inner circumference of the sliding seal part 12, as shown in FIG. 4 above. It performs the same function as the flushing mechanism in conventional mechanical seals.
以上、本考案によると、一対のメカニカルシー
ル間の環状空間に循環供給される潤滑液を機内側
メカニカルシールの摺動シール部から機内側へ所
定流量で常時流出させることによつて、密封対象
流体を機内へ押し戻すフラツシング機能をもたせ
たため、上記環状空間への循環装置のほかにフラ
ツシング液の供給装置を設ける必要がなくなり、
構造の簡素化および小型化が図れるといつた優れ
た効果を奏する。
As described above, according to the present invention, the lubricating fluid that is circulated and supplied to the annular space between the pair of mechanical seals is constantly flowed out from the sliding seal part of the inside mechanical seal to the inside of the machine at a predetermined flow rate, so that the fluid to be sealed is Since it has a flushing function to push liquid back into the machine, there is no need to provide a flushing liquid supply device in addition to the circulation device to the annular space.
This provides excellent effects such as simplifying the structure and reducing the size.
第１図は本考案に係るフラツシング機構を備え
たメカニカルシールの一実施例を示す半裁断面
図、第２図は第１図における−線断面図、第
３図は同要部拡大断面図、第４図は従来のメカニ
カルシールを示す半裁断面図である。
１……回転軸、５……大気側メカニカルシー
ル、９……機内側メカニカルシール、８，１２…
…摺動シール部、１５……加圧溝、１８……加圧
導入部、Ａ……大気側、Ｂ……機内、Ｃ……環状
空間、Ｏ……幅方向中央部、ａ……潤滑液兼用フ
ラツシング液。
Fig. 1 is a half-cut sectional view showing an embodiment of a mechanical seal equipped with a flushing mechanism according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. FIG. 4 is a half-cut sectional view showing a conventional mechanical seal. 1...Rotating shaft, 5...Atmospheric side mechanical seal, 9...Inside mechanical seal, 8, 12...
...Sliding seal part, 15...Pressure groove, 18...Pressure introduction part, A...Atmospheric side, B...Inside the machine, C...Annular space, O...Central part in the width direction, a...Lubrication Flushing liquid that can be used as a liquid.
Claims (1)
ール部の外周側に区画形成される環状空間に、潤
滑液兼用フラツシング液を循環供給するととも
に、上記環状空間内における上記潤滑液兼用フラ
ツシング液の加圧導入部内周に位置する機内側メ
カニカルシールの摺動シール部に、その摺動面の
外径縁から幅方向中央部より内径側に達する加圧
溝を設け、前記摺動シール部から機内側へ、上記
潤滑液兼用フラツシング液を所定流量で常時漏洩
させてなることを特徴とするフラツシング機構を
兼ねたメカニカルシール。 Circulating and supplying the lubricant-cum-flushing liquid to an annular space defined on the outer periphery of the sliding seal portion of a pair of mechanical seals arranged in the axial direction, and pressurizing the lubricant-cum-flushing liquid in the annular space. A pressure groove is provided in the sliding seal part of the in-machine mechanical seal located on the inner periphery of the introduction part, from the outer diameter edge of the sliding surface to the inner diameter side from the center in the width direction, and from the sliding seal part to the machine inside. , A mechanical seal that also serves as a flushing mechanism, characterized in that the flushing fluid that also serves as a lubricant is constantly leaked at a predetermined flow rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987009933U JPH0448374Y2 (en) | 1987-01-28 | 1987-01-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987009933U JPH0448374Y2 (en) | 1987-01-28 | 1987-01-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63119969U JPS63119969U (en) | 1988-08-03 |
| JPH0448374Y2 true JPH0448374Y2 (en) | 1992-11-13 |
Family
ID=30795719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987009933U Expired JPH0448374Y2 (en) | 1987-01-28 | 1987-01-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0448374Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5712067B2 (en) | 2011-06-27 | 2015-05-07 | 株式会社日立製作所 | High temperature fluid shaft seal device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548146Y2 (en) * | 1975-04-01 | 1980-11-11 |
-
1987
- 1987-01-28 JP JP1987009933U patent/JPH0448374Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63119969U (en) | 1988-08-03 |
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