JPH0137258Y2 - - Google Patents
Info
- Publication number
- JPH0137258Y2 JPH0137258Y2 JP10821585U JP10821585U JPH0137258Y2 JP H0137258 Y2 JPH0137258 Y2 JP H0137258Y2 JP 10821585 U JP10821585 U JP 10821585U JP 10821585 U JP10821585 U JP 10821585U JP H0137258 Y2 JPH0137258 Y2 JP H0137258Y2
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- rotating shaft
- shaft
- end surface
- sealing device
- 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
- 238000007789 sealing Methods 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011176 pooling Methods 0.000 description 1
Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、粘性流体を封入した機体の回転軸の
軸周をスクリユーポンプ作用でシールする軸封装
置の改良に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a shaft sealing device that seals the periphery of a rotating shaft of a machine body filled with viscous fluid by a screw pump action.
従来、この種の非接触型の軸封装置（以下、ビ
スコシールと称す）においては、第３図に示すよ
うに、粘性流体が封入された機体１の内径部２と
回転軸３との間をシールする場合、該回転軸３の
シール面に相当する軸周にスパイラルの溝４を切
つてスクリユーポンプとして使用し、回転軸３の
回転に伴なつて前記機体１の内径部２と回転軸３
の外径部との間の隙間ａから外部に洩れ出ようと
する粘性の高い油を機体１内に押し戻すようにし
てなる構造を有するものがある。
Conventionally, in this type of non-contact type shaft sealing device (hereinafter referred to as a visco seal), as shown in FIG. When sealing the rotary shaft 3, a spiral groove 4 is cut on the circumference of the rotary shaft 3 corresponding to the sealing surface and used as a screw pump. Axis 3
Some have a structure that pushes back into the fuselage 1 highly viscous oil that tends to leak out from the gap a between the outer diameter part of the fuselage and the outer diameter part of the fuselage.
このようなビスコシールは、機体内径部と回転
軸の外径部との間の隙間ａの間隔をＣとすると、
スクリユーポンプ作用により、密封液の圧力Ｐと
液体部の長さｌが、下式のようにバランスして密
封されている。 For such a visco seal, let C be the gap a between the inner diameter of the machine and the outer diameter of the rotating shaft.
Due to the screw pump action, the pressure P of the sealing liquid and the length l of the liquid part are balanced and sealed as shown in the equation below.
Ｐ＝6μUl／C2Λ
μ：密封流体の粘度
Ｕ：周速度
Λ：スクリユーの幾何学的形状により定まる定
数
〔考案が解決しようとする問題点〕
しかしながら、上述の従来装置にあつては、高
速回転域になるに連れて、回転軸３に切設した溝
４が外部から空気を巻き込んでガスインジエクシ
ヨンと呼ばれる現象が生じ、このため流体と空気
の境界面が不安定となつたり、また機体内に存在
している空気がシール部を吹き抜けてゆくため
に、密封特性が不安定になつて密封性能が低下
し、油洩れを生じ易いといつた問題があつた。 P=6 μUl/C 2 Λ μ: Viscosity of sealed fluid U: Peripheral speed Λ: Constant determined by the geometrical shape of the screw [Problem to be solved by the invention] However, in the case of the above-mentioned conventional device, the high speed As the rotation range increases, the groove 4 cut into the rotating shaft 3 draws in air from the outside, causing a phenomenon called gas injection, which causes the interface between fluid and air to become unstable, and As the air existing inside the fuselage blows through the seal, the sealing properties become unstable, reducing sealing performance and causing oil leaks.
本考案は、上述の問題点に鑑みてなされたもの
で、高速回転域での密封性能を向上させるように
した軸封装置を提供することを目的としたもので
ある。
The present invention was devised in view of the above-mentioned problems, and an object thereof is to provide a shaft sealing device that improves sealing performance in a high-speed rotation range.
上述の問題点を解決するために、本考案は、機
体外部に突出する回転軸の径を被シール部の径よ
りも小径に段付形成し、該小径な段付部と機体外
端面との間に断面Ｌ字形のキヤツプリングを設け
てなる構成としたものである。
In order to solve the above-mentioned problems, the present invention forms a step in which the diameter of the rotating shaft protruding outside the machine body is smaller than the diameter of the part to be sealed, and the small diameter stepped part and the outer end surface of the machine body are formed in a stepped manner. A cap ring having an L-shaped cross section is provided between the two.
〔作用〕
すなわち、本考案は、上述の構成によつて回転
軸の小径な段付部とキヤツプリングとの間の隙間
が微小になり、高速回転域になつても空気の巻き
込み量が少ないために、密封性能を低下させるこ
とはない。また、万一、粘性流体が空気と一緒に
なつて洩れ出たとしても、流体は機体の外端面と
キヤツプリングとの間に形成される空間に溜める
ことができることから、溜まつた流体は、スクリ
ユーポンプ作用によつて再び機体内に押し戻され
るため、直接外部に洩れ出ることを防止すること
が可能になる。このＬ字形のキヤツプは合成ゴム
等で作られているので可撓性があり、２つ割にし
なくとも、軸の段付部に装着可能である。[Function] In other words, the present invention has the structure described above, which makes the gap between the small-diameter stepped portion of the rotating shaft and the cap ring very small, so that even in the high-speed rotation range, the amount of air entrained is small. However, there is no reduction in sealing performance. In addition, even if viscous fluid leaks together with air, the fluid can be collected in the space formed between the outer end surface of the fuselage and the cap ring, so the collected fluid can be Since it is pushed back into the body by the screw pump action, it is possible to prevent it from directly leaking outside. Since this L-shaped cap is made of synthetic rubber, it is flexible and can be attached to the stepped portion of the shaft without having to cut it into two.
以下、本考案を第１図に示す一実施例にもとづ
いて説明する。なお、本考案に係る図示の実施例
において、第３図に示す従来構造のものと構成が
重複する部分は同一符号を用い、その説明は省略
する。
The present invention will be explained below based on an embodiment shown in FIG. In the illustrated embodiment of the present invention, the same reference numerals are used for the parts having the same configuration as those of the conventional structure shown in FIG. 3, and the explanation thereof will be omitted.
すなわち、本考案は、第１図に示すように、機
体１の外部に突出する回転軸３の軸径D1を、ス
パイラルの溝４が切設された被シール部３１の軸
径D2よりも小径に段付形成し、かつ該小径な段
付部３２と前記機体１の外端面との間に合成ゴム
等からなる断面Ｌ字形のキヤツプリング５と前記
回転軸３とは非接触状態に配置して、その一端面
を前記機体１の外端面に取り付けてなるもので、
該キヤツプリング５と回転軸３の段付部３２との
間は微小な隙間ｂとなつているとともに、前記機
体外端面とキヤツプリング５の内周端面との間に
液溜まりとなる空間６を形成してなる構成を有す
るものである。 That is, in the present invention, as shown in FIG. 1, the shaft diameter D 1 of the rotating shaft 3 protruding to the outside of the machine body 1 is set to be smaller than the shaft diameter D 2 of the sealed portion 31 in which the spiral groove 4 is cut. A cap ring 5 having an L-shaped cross section made of synthetic rubber or the like is formed in a non-contact state between the small-diameter stepped portion 32 and the outer end surface of the body 1, and the rotating shaft 3 is formed with a small diameter step. and one end surface thereof is attached to the outer end surface of the aircraft body 1,
There is a small gap b between the cap ring 5 and the stepped portion 32 of the rotating shaft 3, and a space 6 which becomes a liquid pool is formed between the outer end surface of the machine body and the inner peripheral end surface of the cap ring 5. It has a structure formed by forming.
また、第２図は、本考案に係る他の実施例を示
し、スクリユーポンプ作用をなすスパイラルの溝
４を、機体１の内径部２に切設した構成を有する
ものである。 FIG. 2 shows another embodiment of the present invention, in which a spiral groove 4 that acts as a screw pump is cut into the inner diameter portion 2 of the body 1.
以上の説明から明らかなように、本考案は、機
体の外部に突出する回転軸をビスコシール部の軸
径より小径にし、この小径部と機体外端面との間
にキヤツプリングを設けて液溜まりを形成してな
ることから、高速回転域での空気の巻き込み量も
少なく、しかも万一、流体が洩れ出たとしても、
液溜まりに溜めることができるために液溜まりに
溜まつた流体をスクリユーポンプ作用によつて再
び機体内に押し戻すことができ、これによつて密
封性能の向上が図れるといつた効果を有するもの
である。
As is clear from the above explanation, the present invention has a rotating shaft that protrudes outside the machine body with a smaller diameter than the shaft diameter of the visco seal part, and a cap ring is provided between this small diameter part and the outer end surface of the machine body to prevent liquid from pooling. Because it is formed with a
Since the fluid can be stored in a liquid pool, the fluid collected in the liquid pool can be pushed back into the body by the screw pump action, which has the effect of improving sealing performance. It is.
第１図は本考案に係る軸封装置の一実施例を示
す要部概略的断面図、第２図は本考案に係る他の
実施例を示す要部概略的断面図、第３図は従来の
軸封装置の要部概略的断面図である。
１……機体、２……内径部、３……回転軸、３
１……被シール部、３２……段付部、４……溝、
５……キヤツプリング、６……液溜まり、D1，
D2……軸径。
Fig. 1 is a schematic cross-sectional view of the main part showing one embodiment of the shaft sealing device according to the present invention, Fig. 2 is a schematic cross-sectional view of the main part showing another embodiment according to the present invention, and Fig. 3 is a conventional FIG. 2 is a schematic cross-sectional view of main parts of the shaft sealing device of FIG. 1... Body, 2... Inner diameter part, 3... Rotating shaft, 3
1...Sealed part, 32...Stepped part, 4...Groove,
5... Cap spring, 6... Liquid pool, D 1 ,
D 2 ...Shaft diameter.
Claims (1)
転軸の軸周をスクリユーポンプ作用でシールする
軸封装置において、前記回転軸の機体外部側を被
シール部の径よりも小径に段付形成し、該小径な
段付部と前記機体外端面との間に断面Ｌ字形のキ
ヤツプリングを設けたことを特徴とする軸封装
置。 In a shaft sealing device that uses a screw pump action to seal the periphery of a rotating shaft that protrudes to the outside of a machine body filled with viscous fluid, the outer side of the rotating shaft is stepped to have a smaller diameter than the diameter of the part to be sealed. A shaft sealing device characterized in that a cap ring having an L-shaped cross section is provided between the small-diameter stepped portion and the outer end surface of the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10821585U JPH0137258Y2 (en) | 1985-07-17 | 1985-07-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10821585U JPH0137258Y2 (en) | 1985-07-17 | 1985-07-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6216867U JPS6216867U (en) | 1987-01-31 |
| JPH0137258Y2 true JPH0137258Y2 (en) | 1989-11-10 |
Family
ID=30985202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10821585U Expired JPH0137258Y2 (en) | 1985-07-17 | 1985-07-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0137258Y2 (en) |
-
1985
- 1985-07-17 JP JP10821585U patent/JPH0137258Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6216867U (en) | 1987-01-31 |
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