JP3004998U - Double lip packing for shaft seal - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent leakage of fluid in the packing part of the shaft sealing device of fluid machinery and to prevent wear of the packing and shaft. [Constitution] Packing 1 attached to fluid machine body 5
There are packing lips A2 and packing lips B3, the inner surfaces of which are in contact with the periphery of the shaft 10, on both the upper and lower sides of the shaft 10, and there is a space in the cross section of the packing 1 which is continuous with the space between the two and these spaces. The viscous lubricant 4 is enclosed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packing for a shaft sealing device of a fluid machine such as a water turbine, a pump, a blower used in a power plant or a factory.

[0002]

[Prior art]

 In order to prevent leakage, the packing of the shaft sealing device of conventional hydraulic machines such as water turbines, pumps, and blowers should be put in a packing land and the packing retainer should be tightened with a screw to pressurize it or press it against the shaft. The lip portion that is in close contact with the surroundings was pressed against the shaft by applying force with springs. Also, no lubricant supply device was provided between the shaft and the lip of the packing.

[0003]

[Problems to be solved by the device]

 In the packing of the shaft seal device of the conventional fluid machine, the pressure applied to the packing and the lip is constant, and the pressure is insufficient for the pressure of the fluid to be shaft-sealed, and the fluid leaks or becomes excessive. The sliding parts often wear due to excessive friction, and this tendency is further promoted by the fact that the pressure inside the fluid machine fluctuates from positive pressure to negative pressure depending on the operating conditions of the fluid machine. In addition, no lubricant was supplied between the shaft and the lip, so that wear and heat generation could not be prevented. An object of the present invention is to solve this problem and to provide a packing for a shaft sealing device which causes less fluid leakage, wear and heat generation.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the packing of the present invention, lips are provided on both sides in close contact with the circumference of the shaft, and a space is provided in the cross section of the packing continuously with the space between both lips. A viscous lubricant is enclosed in the space.

[0005]

[Action]

 When the fluid pressure inside the fluid machine becomes higher than the outside, the inner lip is pushed outward by the lips on both sides of the packing that are in close contact with the circumference of the shaft of the fluid machine and the viscous lubricant enclosed inside. , The pressure is transmitted to the viscous lubricant and pushes the outer lip against the shaft, and the pressure corresponds to the internal pressure, so the force pushing the lip becomes proper without excess or deficiency. When the pressure on the outside of the fluid machine becomes higher than that on the inside, the inner lip is pressed against the shaft. This action prevents fluid leakage. The proper pressing force of this lip and the lubrication of the viscous lubricant enclosed in the hollow part reduce unnecessary friction between the lip part of the packing and the shaft to prevent wear and heat generation and prevent foreign matter from entering the packing part. To do.

[0006]

【Example】

 An embodiment of the present invention will be described below. In FIG. 1, a packing 1 is attached to a fluid machine body 5 by a packing retainer 8 and a vault 9, and an inner surface is closely attached to the upper and lower sides of the packing 1 around a shaft 10. There is a packing lip A2 and a packing lip B3, and a space between the packing lip A2 and the packing lip B3 is continuous with the space between the packing 1 and the viscous lubricant 4 in these spaces. It is enclosed. The fluid machine body 5 is provided with a labyrinth 7 and a sealing water inlet 6.

[0007]

[Effect of device]

 Since the present invention is configured as described above, even if the pressure inside the fluid machine of the fluid machine fluctuates from positive pressure to negative pressure, which is difficult with the conventional method with this packing, the leakage of the shaft sealing part will not occur. It is possible to prevent wear and heat generation by reducing unnecessary friction between the shaft and the lip portion of the packing in combination with the lubricating effect of the enclosed viscous lubricant. Further, the lip and the viscous lubricant prevent foreign matter from entering the packing portion to prevent damage to the shaft and the packing, thereby extending the life of the shaft and the packing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a packing mounting portion of a fluid machine.

[Explanation of symbols]

 1 Packing 2 Packing lip A 3 Packing lip B 4 Viscous lubricant 5 Fluid machine body 6 Sealing water inlet 7 Labyrinth 8 Packing retainer 9 Vault 10 Shaft

Claims (1)

[Scope of utility model registration request] 1. A packing is provided on both sides of a packing that is in close contact with the periphery of the shaft, and has a space in the packing cross section which is continuous with the space between both lips, and a viscous lubricant is enclosed in these spaces. Double lip packing for shaft seal.