JPS58113661A - Shaft sealing device - Google Patents

Abstract

PURPOSE:To enable a shaft to rotate under the dry condition by fitting a driven ring constituting meeting surfaces relatively rotatable perpendicularly to a shaft in a casing through a packing to be pressed against a sealing ring with a spring and filling an antifriction body in the meeting surfaces. CONSTITUTION:When a shaft 3 is rotated, a sealing ring 4 is rotated together. Since a driven ring 6 is not rotated, meeting surfaces 8 provide relatively rotatable ones to restrict fluid flow also in the rotation of the shaft 3. And when the meeting surfaces 8 wear, a spring 9 urges the driven ring 6 toward the sealing ring 4 to hold the close contact as before. And when the outer diameter D of the meeting surface is made larger than the inner diameter d of a cover 2 to provide a proper size of the inside diameter G of the meeting surface, the driven ring 6 is pressed into the sealing ring 4 by sealing fluid pressure too. Further one of the meeting surfaces 8 is provided with a plurality of holes 10 which are filled with antifriction body T such as fluorine resin comprising sintered carbon or filler or not comprising it to reduce coefficient of friction and provide safe sealing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention limits the flow of fluid at a meeting surface of relatively rotating surfaces substantially perpendicular to an axis, in which a sealing ring connected to a surface constituting the meeting surface, A so-called driven ring that can move in the axial direction is fitted into the casing or a part connected to the casing through a suitable gasket, and the outer end of this driven ring is located at the opposite side of the casing, and the surface forming the meeting surface is At least one part of the Middle East relates to a shaft sealing device characterized by being filled with an anti-friction material such as sintered carbon or fluororesin with or without filler, and its purpose is to dry The object of the present invention is to obtain a shaft sealing device that is operable and capable of sealing high viscosity fluid.

The shaft sealing device of the present invention will be explained with reference to illustrative drawings.

The end of the casing (1) is surrounded by a cover (2). The shaft (3) passes through these casings and covers.

The sealing ring (4) is fixed to the outer periphery of the shaft (3) through a gasket. The sides of this sealing ring (4) are provided with surfaces (5). This surface is the axis II of the shaft (3)! tc). Driven ring (
6)? i Circumference v of cover (2) through packing (7)
Attach it so that it can move in the c@ direction. The side of this driven ring is provided with surfaces (8). This surface is brought into close contact with surface (5) to form a meeting surface (phrase). Driven ring (6)
The outer end (C) is fixed to the flange (forced).The axial hole (B) provided in this 7 flange is inserted into the bolt 0 fixed to the cover (2).

Attach the double nut () to the end of the bolt (c).

An appropriate spring (9) is interposed between this double nut and the 7 langes 0. The outer periphery of the meeting surface C) is in contact with the sealing fluid (body), and the outer end (c) of the driven ring (6) is located on the side of the fluid (A) opposite to the sealing fluid (g).

The spring (9), by its elastic force, presses the driven ring (6) against the sealing ring (4) through the seven flange, thereby increasing the strength of the close pressure of the meeting surface volume. Since the elastic force of this spring can be adjusted by changing the axial position of the double nut (T), the strength of the close pressure by the spring on the meeting surface (B) can also be adjusted freely.

At least one of the faces constituting the meeting face (→), for example face (8), is provided with a large number of holes (g), and this large circle is filled with sintered carbon or a fluororesin with or without filler. For example, anti-friction material σ such as tetrafluoroethylene resin
Fill the tank. In the illustrative drawings, the surface (8) is made primarily of phenolic resin.

With this configuration, when the shaft (3) is rotated, the sealing ring (4) rotates together with this shaft. Since the driven ring (6) does not rotate, the meeting surface (S) serves as a meeting surface for relatively rotating surfaces and limits the flow of fluid even during rotation of the shaft (3). When the meeting surface (S) wears out,
The spring (9) forces the driven ring (6) towards the sealing ring (4) and keeps the meeting surface (S) in close contact.

In addition, as shown in the example, the diameter (DI) of the outer periphery of the meeting surface is made larger than the diameter (d) of the inner periphery of the cover, and the diameter (G) of the inner periphery of this meeting surface is larger than the inside diameter. If also made appropriately small or large, the driven ring (6) will also be pressed towards the sealing ring (4) by the sealing fluid pressure.
This pressing force can be appropriately selected by appropriately selecting p) and (G). In the shaft sealing device of this building, if the driven member (6) is mainly made of phenolic resin filled with a filler, the strength is relatively strong and it can withstand a certain degree of dry operation.

However, if the pv value is high or if the sealing fluid is a highly viscous fluid such as unvulcanized rubber, it will overheat and become unusable. However, in the shaft sealing device of the present invention, since the surface (8) circle is filled with the above-mentioned friction reducing body, this friction reducing body forms a coating within the meeting surfaces and lowers the coefficient of friction. , reduce ignition. Therefore, even if the pv value during dry operation is high, overheating can be prevented, wear can be reduced, and safe sealing can be achieved.

Furthermore, when sealing a highly viscous fluid, it is possible to prevent adhesion of the meeting surfaces and prevent overheating. Also, in dry operation or shaft sealing with high viscosity fluid, the spring force IIIE against the contact pressure of the meeting surfaces is xI! However, in the shaft sealing device of the present invention, the outer end of the driven ring (6) can be exposed to the outside of the machine, so this spring force can be controlled mechanically. Appropriate adjustments can be made from the outside to achieve an appropriate amount of wear and provide appropriate shaft sealing.

[Brief explanation of drawings]

The drawings show an embodiment of the shaft sealing device of the present invention. Figure 1 is a half-section side view, and Figure 2 is a side view of Y in Figure 1.
A portion of the 2-'b projection is shown. (1)...Casing. (2)・・・・・・
Power? (. (3)...Shaft. (4)...
...Sealed ring. (5)... surface. (6)・
...Driven ring. (7)・・・Patsukin. (8)... surface. (9) Spring. View...hole. (A)...Fluid. (E)・・・Bolt. (C)・・・Axis line. (c) ...outer end. (G)...Flange. (Takumi...Hole. C)...Double nut. (Body...Episode fluid. GP)...Patsukin. (S)...Meeting ／′% Hariyama Ganjin Co., Ltd. Arai Seisakusho

Claims (1)

[Claims] In devices that restrict the flow of fluid at a meeting surface of relatively rotating surfaces that are approximately perpendicular to the axis, a so-called driven ring that can move in the axial direction is installed in a sealing ring connected to the surfaces that make up this meeting surface. It is fitted into the casing or a part connected to the casing through a suitable packing, and the outer end of this driven ring is located on the side opposite to the sealing fluid, and at least one of the middle and middle parts of the surface constituting the above-mentioned meeting surface is covered with sintered carbon or A shaft sealing device characterized in that it is filled with an anti-friction material such as a fluororesin with or without a filler.