JPS6210486Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in hydrostatic gas bearings.

The structure of a conventional hydrostatic gas bearing of this type is shown in FIG. In the figure, reference numeral 1 denotes a rotation axis, hereinafter abbreviated as axis. 2 is the casing, 3 is the bearing, 4 is the O-ring,
5 is a gas supply port, and 6 is a static pressure gas bearing supply hole. The supply gas is introduced from the supply port 5 as indicated by arrow A, passes through the bearing gap, and is discharged to the surroundings as indicated by arrow W.

The above structure is an example of a general hydrostatic gas bearing, but this has the following drawbacks.

(1) In high-temperature or extremely low-temperature atmospheres, O-ring 4
is not possible.

(2) Furthermore, even if a sealing type is used instead of the O-ring 4, the structure will be complicated.

For reasons (1) and (2) above, it may be difficult to supply gas from the bearing side.

The purpose of this invention is to focus on the above points and provide a gas supply structure that does not require a supply gas seal mechanism for the bearing. In a static pressure bearing that supplies pressurized gas between a bearing casing that has a bearing surface formed on the circumferential side, a gas supply holder that connects to a pressure gas supply source and is located on the axis of the rotating shaft is used. A gas supply flange fixed to one end of the bearing casing, and a gas supply flange drilled in the rotating shaft to a predetermined depth from the side opposite to the open end of the gas supply flange concentrically with the rotating shaft. a communication hole for guiding pressure gas from the flange; and a plurality of air supply holes drilled radially such that one end communicates with the communication hole and the other end opens on the rotating shaft surface facing the bearing surface of the bearing casing. It is to have the following.

The present invention can be applied to thermal separators.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an embodiment of the present invention, and is a sectional view showing a test device for testing the rotational performance of the shaft-side air supply type static pressure gas bearing of the present invention.

In the figure, 1 is a shaft, and 7 is a communicating hole drilled concentrically with the coaxial 1 to a predetermined depth from one end side of the coaxial 1. The communication hole 7 does not penetrate to the other end (outlet side) of the shaft and is blind.

Reference numeral 10 denotes a bearing casing, the inner peripheral surface of which is formed as a bearing surface. Note that the bearing may be formed separately and fixed to the casing.

Reference numeral 8 denotes a plurality of static pressure gas bearing gas supply holes which are radially bored at equal intervals in the circumferential direction from the communication hole 7 and open on the surface of the shaft 1 facing the bearing surface of the bearing casing 10.

11 is a gas supply holder, 12 is a gas supply flange, and 13 is a connection flange, which is connected to a pressure gas supply source and supplies pressure gas to the communicating hole 7.

9 is a turbine blade, 14 is a hydrostatic gas thrust bearing, 19 is a gas supply hole for the hydrostatic gas thrust bearing, and 15 is a hydrostatic gas thrust bearing holding flange. Note that 16, 17, and 18 are gaskets.

The operation in the case of the above configuration will be described.

The bearing supply gas indicated by arrow C is sent from the connection flange 13, through the gas supply flange 12, into the communication hole 7 of the shaft 1, and from the static pressure gas bearing gas supply hole 8 to the inner circumference of the bearing casing 10. Squirt onto the surface.

The supply gas indicated by arrow B can be blown onto the turbine blades 9 processed on the shaft 1 to impart rotation to the shaft 1.

Further, as shown by arrow D, static pressure gas for the thrust bearing is sent to apply a load to the shaft thrust generated by the pressure of the supply gas C.

These supply gases B, C, and D are indicated by arrows X, Y, and Z.
It is discharged as shown in .

An example of application to a thermal separator is shown in FIG. 3 and will be described in detail. A nozzle is provided at the turbine blade 9 in FIG. 2, and a mixed gas is injected from the nozzle into an expansion tube attached to a casing to perform gas-liquid separation. Description of the same parts as in FIG. 2 will be omitted.

The mixed gas C is supplied from one end of the shaft 1 through the communication hole 7, and a nozzle 20 is machined at the other end of the shaft 1.
The gas is ejected from the casing in an adiabatic jet direction as shown by arrow K toward the expansion tubes 21 which are formed in a plurality of pieces in the circumferential direction of the casing. The nozzle 20 has an inclination in the radial direction from the center of the shaft 1 so that a rotational force can be applied to the shaft 1 by the reaction force in the tangential direction due to the injection.

The mixed gas C expands adiabatically and becomes low temperature, and the gas whose liquefaction temperature is higher than the cooled temperature is liquefied and separated into gas and liquid.

As described above, according to the present invention, there is no need for a sealing mechanism for the gas supplied to the bearing, and the structure of the bearing can be made compact.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional hydrostatic gas bearing, and Fig. 2 is an embodiment of the present invention. Fig. 3a is a sectional view showing an example of application to a thermal separator, Fig. 3b is a sectional view of the third
It is a sectional view taken along the line H-H in Figure a. DESCRIPTION OF SYMBOLS 1... Shaft, 7... Communication hole, 8... Hydrostatic gas bearing gas supply hole, 9... Turbine blade, 10
... Bearing casing, 11 ... Gas supply holder, 12 ... Gas supply flange, 13 ... Connection flange, 14 ... Hydrostatic gas thrust bearing, 15
...Static pressure gas thrust bearing holding flange, 19...
...Gas supply hole for static pressure gas thrust bearings.

Claims (1)

[Scope of utility model registration request] In a static pressure bearing that supplies pressurized gas between a rotating shaft and a bearing casing that surrounds the rotating shaft and has a bearing surface formed on the inner circumference, a bearing connected to a pressure gas supply source and located on the axis of the rotating shaft. a gas supply flange fixed to one end side of the bearing casing via a gas supply holder, and a gas supply flange attached to the rotating shaft from a side facing the open end of the gas supply flange concentrically with the axis of the rotating shaft. A communicating hole is bored to a predetermined depth and guides the pressure gas from the gas supply flange, and one end is connected to the communicating hole and the other end is opened on the rotating shaft surface facing the bearing surface of the bearing casing. A shaft-side air supply type static pressure gas bearing characterized by having a plurality of air supply holes drilled radially.