JPH07139636A - Sealing of fluid leakage from rotary shaft periphery - Google Patents

Abstract

PURPOSE:To seal gases and solvents by covering the surface of a rotary shaft with grease or the substance similar to grease which is plastic and solid at normal temperature. CONSTITUTION:The surface of a rotary shaft is directly covered with the substance which is plastic and solid at the normal temperature by filling the space which is surrounded by a shroud 2 whose three sides are made of elastic body, and where one side partitions the surface of the rotary shaft by the elastic body 5 with grease 1 or the substance which is plastic and solid at the normal temperature. The seal of the rotary shaft can shut off any gas of fine particles, and the sealing can be realized by using the non-elastic body for the shroud to the seal of the fluid such as the solvent which swells the elastic body.

Description

Detailed Description of the Invention

[Industrial application] Oil and fluid seals, gas seals, solid and powder seals, and other domains using equipment that uses rotating bodies.

2. Description of the Related Art Since the sealing material is elastic or solid,
The sealability of the rotating body of gas or fluid with high internal pressure is extremely poor. 2. Even if a liquid sealing material is applied, it is used by directly overlaying the paint or coating on it,
2. The sealing material cannot be fixed to the sealed part and is not suitable for sealing the rotating body. When the solid as the sealing material is directly friction-contacted with the surface of the rotating shaft, the wear and deterioration of the sealing material due to frictional heat are accelerated, the sealing performance is deteriorated, and the motion efficiency of the rotating shaft is poor.

[Problems Solved by the Invention]

1. 1. Seal the rotating shaft when the fluid is small particles such as gas. 2. The seal of the rotating shaft when the fluid penetrates a normal elastic body such as a solvent. 3. Seal of rotating shaft when fluid internal pressure is relatively high 4. Low friction heat 5. Low wear of seal material 6. Enables sealing in case of high speed rotation of rotating shaft

[Means for solving the problem]

1. By directly supplementing a certain width of the surface of the rotating shaft with a certain volume of fluid or an amorphous spaceless substance, the fluid from the inside of the rotating body is completely blocked, so the seal is reliable. 2. Since the grease used as the seal material is liquefied by the friction heat of the material used for the enclosure and the rotating shaft, the coefficient of friction with the rotating shaft becomes almost zero. 3. When a sealing material such as highly viscous grease is surrounded by an elastic body, the friction between the elastic body and the rotating shaft causes wear, and even if a slight gap is created, it is sealed with an oil film, so the sealing performance is extremely high.

[Operation] The seal of the rotating shaft by the fluid can block any fine particles of gas, and by using the non-elastic body for the seal of the fluid such as the solvent that swells the elastic body, It becomes possible to seal.

[Example] Seal of motor for injection pump of automobile parts

[Effects of the Invention] Gas and solvent seals, which could not be achieved with conventional oil seals, have been made possible, and the cost is high as with metal seals. It can be replaced with certainty in terms of sealing performance. In addition, the structure is simple in terms of general oil seals, resulting in significant cost reduction and durability.

[Brief description of drawings]

FIG. 1 An example of a cross-sectional view of a seal structure

[Explanation of symbols]

 1. Glycerin 2. Elastic enclosure 3. Elastic case 4. 4. Ceiling and contact surface of casing of rotating body Sealing surface with rotating shaft 6. Elastic body

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[Procedure amendment]

[Submission date] December 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

3. A grease or the like in a space surrounded by an elastic body or an inelastic body and an elastic body and the surface of the rotating shaft fitted in a cylindrical case having a hollow hole for the rotating shaft at the center. A leak preventer that directly seals the surface of the rotating shaft, focusing on plastic solids at room temperature such as grease. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (3)

[Claims] 1. A state in which leakage of fluid from around a rotating body is surrounded by grease or fluid or an amorphous substance surrounded by a case so that a certain width on the surface of a rotating shaft does not flow out in a certain volume. A leak preventer that blocks and seals other substances with. 2. A leak preventer in which a fluid having a pressure, a specific gravity, or a density higher than that of a fluid inside a rotating body, grease, or an amorphous substance is filled in the enclosure and the surface of the rotating shaft is covered and sealed. 3. A leak preventer in which an elastic body, an inelastic body, or an inelastic body and an elastic body, which are surrounded on three sides in a case, are incorporated and grease or a fluid or an amorphous substance is incorporated and sealed.