JPS6113811Y2 - - Google Patents

Description

[Detailed description of the invention] This invention divides the holding box into an internal holding box and an external holding box, and allows them to move relatively. This invention relates to a seal ring shaft sealing device that has been made possible.

1A and 1B show a conventional seal ring shaft sealing device, FIG. 1A is a side sectional view, and FIG. 1B is a sectional view taken along the line B--B. 1 is the rotation axis,
2 is a seal ring made of an integral annular ring; 3
is a holding box that stores this seal ring 2, and is composed of an upper half 3a and a lower half 3b.
Reference numeral 4 indicates a sealing oil inlet provided in a plurality of locations in the radial direction on the outer peripheral surface of the seal ring 2 in order to seal high-pressure gas; 5 indicates a radial gap between the rotating shaft 1 and the seal ring 2; and 6 is seal ring 2
A side clearance between the holding box 3 and the holding box 3 is formed on the atmosphere side 6a and the sealed gas side 6b. and,
When gas (sealing oil) is supplied from the inlet 4 and the side gap 6 to seal the high pressure gas,
This sealing oil forms a fluid film in the narrow gap 5 between the rotary shaft 1 and the seal ring 2, and is discharged to both sides of the seal ring 2 through this gap. The supply pressure of this sealing oil is slightly higher than that of the gas to be sealed, so that the sealing oil can completely shut off the gas to be sealed.

Since the conventional seal ring shaft seal device is configured as described above, if the operation continues, the holding box 3 may become damaged due to thermal deformation due to temperature rise, for example.
The holding box 3 and the seal ring 2 are deformed as shown in the figure, and the seal ring 2 is restrained by the holding box 3. In such a case, the seal ring 2 will no longer be able to follow the floating of the rotating shaft 1 due to the formation of a bearing oil film during rotation or the vibration of the rotating shaft 1, resulting in problems such as a lack of long-term reliability of the seal ring 2 and the holding box 3. There were flaws.

This idea was developed with this in mind.The holding box is divided into an internal holding box and an external holding box, and both holding boxes are made relatively movable, thereby preventing the seal ring from being excessively constrained. It is an object of the present invention to provide a seal ring shaft sealing device in which no force is applied.

That is, FIG. 3 shows an embodiment of this invention, in which the holding box 3 is divided into two parts, an external holding box 31 and an internal holding box 32, and both holding boxes are made relatively movable on the dividing plane. This is what I did. That is, the internal holding box 32 is formed into a ring shape to accommodate the seal ring 2, and when cut in the axial direction, the outer circumferential section thereof has a semicircular shape in the axial direction, and the inner circumference accommodates the seal ring 2. A groove is provided to
The external holding box 31 is loosely fitted to the outer circumference of the internal holding box 32 with a certain gap therebetween, and stores the internal holding box 32 therein.

Therefore, according to this invention, when the external holding box 31 undergoes thermal deformation as shown in FIG. 4 during rotation, the external holding box 31 and the internal holding box 3
The internal holding box 32 and the shaft 1 are always perpendicular to each other, and no excessive restraining force is applied to the seal ring.
Further, since the holding box is divided, the temperature of the internal holding box 32 is almost uniform, and thermal deformation is very small, so that no excessive restraining force is exerted.

As mentioned above, according to this invention, the seal ring always moves following the movement of the shaft.
It has excellent practical effects and can be expected to have a longer lifespan than conventional ones.

[Brief explanation of the drawing]

Figures 1a and b show a conventional seal ring shaft sealing device. Figure 1a is a side sectional view, Figure 1b is a BB sectional view thereof, and Figure 2 is a state of thermal deformation of the conventional seal ring. FIG. 3 is a side sectional view showing an embodiment of this invention, and FIG. 4 is a sectional view showing the state of thermal deformation of the holding box of this invention. In the drawing, 1 is the rotating shaft, 2 is the seal ring, 3 is the holding box, 4 is the sealing oil inlet, 5 is the gap between the rotating shaft and the seal ring, 6 is the gap between the seal ring and the holding box, 31 is the external holding Box 32 is an internal holding box. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A seal ring made of an annular ring disposed on the outer circumferential surface of the rotating shaft with a gap from the rotating shaft, and a groove portion in the inner circumferential portion for accommodating the seal ring,
A ring-shaped internal holding box whose outer periphery forms a semicircle in the axial direction when cut in the axial direction, and an internal holding box that is loosely fitted onto the outer periphery of the internal holding box with a certain gap, A seal ring comprising: an external holding box that is movable relative to the internal holding box; the seal ring seals the inside and outside by passing high-pressure fluid through the gap between the outer peripheral surface of the rotating shaft and the seal ring; Shaft sealing device.