JPS6342151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gland seal for sealing liquid, and particularly to a gland seal used in a portion where a shaft is rotationally driven.

In the past, when sealing high-pressure liquids, especially water, asbestos packing impregnated with mineral oil and finished with graphite on the surface were often used in a highly tightened state. However, this method is relatively prone to leaks. Due to the need to suppress leaks, high tightening pressure is used, so the drive torque of the shaft is large. Contact with graphite may corrode the shaft. There were other drawbacks.

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a gland seal that can sufficiently seal high-pressure water and reduce shaft drive torque.

The present invention will be explained below with reference to the drawings of one embodiment.

In FIG. 1, a cylindrical shaft 1 passes through the center of a cylindrical stuffing box 2. As shown in FIG. A flange portion 2a formed on the shaft 1 side is provided at one end of the stuffing box 2 with a slight gap therebetween. In the space between the stuffing box 2 and the shaft 1, from the flange 2a side, an annular aluminum packing 3a, a Teflon spacer 4a, an asbestos packing 5a, a Teflon spacer 4b, an asbestos packing 5b, a Teflon spacer 4c, and an aluminum packing. The gaskets 3b are sequentially and securely inserted and compressed in the axial direction by a coil spring 7 via a metal spacer 6. The other end of the coil spring 7 is restrained by a retainer 8 and a retaining ring 9 fixed to the stuff-in box 2. Note that P in the figure indicates the high-pressure water side. Aluminum packing 3
As shown in FIGS. 2A and 2B, a and 3b are formed by coil-forming aluminum foil having unevenness or by forming a coil into a spiral shape. The asbestos packings 5a and 5b are lattice-knitted asbestos packings impregnated with 10 to 20% by weight of Si oil.
Further, the Teflon spacers 4a, 4b, and 4c are disk-shaped thin plates made of Teflon.

Next, the action will be explained.

In the gland seal having the above structure, the sealing function is mainly performed by the asbestos packings 5a and 5b. The Si oil in the asbestos packings 5a and 5b has the effect of preventing penetration leakage through the asbestos fibers. From the measurement results shown in FIG. 3, this effect is remarkable when impregnated with 10 to 20% by weight of Si oil. In other words, in Figure 3, water pressure: 150
Kg/cm ² , temperature: room temperature, and the drive shaft was stationary.Curve a is without oil impregnation, curve b is
Asbestos packing of conventional specifications, c, d, e are impregnated with Si at 5% by weight, 10% by weight, and 20% by weight, respectively.
That is. Additionally, this Si oil provides lubrication between the packing and the shaft, reducing the shaft drive torque.

Because Si oil has a higher viscosity than mineral oil, it is less likely to be pushed out of the asbestos packing by high-pressure water.

On the other hand, the aluminum gaskets 3a, 3b prevent the asbestos gaskets 5a, 5b from deforming, and since they have excellent thermal conductivity, they dissipate the heat of sliding between the gaskets and the shaft from both ends of the asbestos gaskets 5a, 5b. do the work. The aluminum gaskets 5a and 5b are the second
As shown in the figure, it has an uneven shape, so it has elasticity and works effectively in tightening asbestos packing. Furthermore, the Teflon spacers 4a, 4b, and 4c prevent each gasket from being deformed and from seeping and leaking. Furthermore, in the gland seal according to the present invention, when the pressure is low, sealing is performed by the tightening force of the coil spring 7, and when the pressure is high, the tightening force increases as the pressure increases.
Seal effect increases.

As explained above, the gland seal according to the present invention always has excellent sealing performance regardless of the magnitude of the liquid pressure, and has the effect that the driving torque of the shaft can be sufficiently reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of a gland seal according to an embodiment of the present invention, FIG. 2 is a sectional view showing an embodiment of the aluminum packing shown in FIG. 1, and FIG. It is a figure of the experimental result which shows the relationship between the seal tightening pressure and the amount of water leakage. 1...axis, 2...stuffing box, 3
a, 3b...Aluminum packing, 4a, 4b, 4c
...Teflon spacer, 5a, 5b...Asbestos packing, 7...Coil spring, 9...Retaining ring.

Claims (1)

[Claims] 1. A box to be extrapolated to the shaft, an asbestos packing impregnated with 10 to 20% by weight of Si oil, which is inserted between the box and the shaft, an aluminum packing which is successively stacked on the asbestos packing and inserted between the box and the shaft, and A grand seal consisting of a Teflon spacer and supporting means for restraining each of the packings and the Teflon spacer.