JP3095601B2 - Rotating body support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body supporting device applied to a gas compressor (compressor), a pump and the like.

[0002]

2. Description of the Related Art FIG. 2 shows a supporting device for a rotating body 1 in a conventional gas compressor using a gas seal. FIG.
In the figure, reference numeral 1 denotes a rotating body composed of an impeller of a gas compressor, which is attached to a rotating shaft 1A extending in the left-right horizontal direction (only the left side is shown). Each rotary shaft 1A is supported by a radial oil slide bearing 3 via an oil film 3B of lubricating oil flowing from a lubricating oil inlet / outlet 3A provided in a casing 6.

[0003] Gas inside a casing 6 accommodating the rotating body 1, the rotating shaft 1A and the like is supplied from a seal portion 2C between a rotating ring 2A mounted on the rotating shaft 1A and a stationary ring 2B mounted on the casing 6. Gas seal 2
Insulated from outside air. This gas seal 2 includes a rotating body 1
And the radial oil sliding bearing 3. In this conventional rotating body support device, the rotating body 1 is usually supported by the radial oil sliding bearing 3, and there is no damping other than the damping of the oil film 3B of the radial oil sliding bearing 3 to the rotating shaft 1A.

[0004]

As described above, in the conventional rotating body support apparatus, the gas seal 2 has no damping function, and the radial oil slide bearing 3 also has an oil film 3B.
There is no damping other than the small damping formed by. Therefore, when the rotating body 1 is greatly excited due to some disturbance (for example, occurrence of a rotating stall in a gas compressor), the rotating shaft 1A swings with a large amplitude, and in the worst case, the oil film 3B is cut and the radial oil sliding bearing is formed. 3
, And sometimes caused troubles due to wear and damage.

[0005] In particular, when a thrust oil slide bearing that bears a load in the thrust direction is mounted, the side opposite to the rotating body 1 can be used.
That is, since a thrust disk having a large load mass is attached to the radial oil slide bearing 3 at the position of the overhang, the excitation force is further increased, and the possibility of trouble is further increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a supporting device which does not have these problems found in the conventional rotating body supporting device and can suppress the amplitude of the rotating shaft to a small value.

[0007]

The present invention employs the following structure to solve the above-mentioned problems.

(I) An extended boss is formed on a thrust disk attached to the shaft end of the rotating shaft, and the extended boss is surrounded by a damper mechanism having a damping action against radial vibration.

(Ii) The damper mechanism has a non-rotating damper movable piece that follows the amplitude of the extension boss via a highly rigid oil film, and allows lubricating oil to flow toward the non-rotating movable piece. A squeeze film of lubricating oil is formed between the non-rotating damper movable piece and the casing.

In the rotating body supporting apparatus according to the present invention, when the rotating body is greatly excited by some disturbance, the vibration amplitude of the extended boss of the thrust disk attached to the shaft end of the rotating shaft is reduced. Although trying to increase, the vibration amplitude is transmitted to the damper mechanism via a highly rigid oil film formed between the outer surface of the extension boss portion and the non-rotating damper movable piece. The vibration amplitude transmitted in this manner is subjected to a damping action by the squeeze film between the damper movable piece and the casing in the above-described damper mechanism, so that the amplitude of the rotating shaft does not become excessive.

[0011] In addition to the above-described structure, the rotating body supporting device according to the present invention adopts a structure in which the extended boss of the thrust disk is hollow and overhangs from the shaft end of the rotating shaft. In the rotating body support device configured as described above, the vibration amplitude of the rotating shaft is reliably transmitted to the extended boss portion formed integrally with the thrust disk and facing the damper movable piece of the damper mechanism. Receives damping action. In addition, since the overhang portion is hollow, the overhang portion is light and the vibration amplitude can be reduced.

[0012]

An embodiment of the present invention will be described below with reference to FIG. This embodiment relates to a supporting device for a rotating body in a gas compressor using a gas seal. FIG.
In the figure, the same reference numerals are given to portions having the same configuration as the conventional support device shown in FIG. In FIG. 1, reference numeral 1 denotes a rotating body composed of an impeller of a gas compressor, and has a rotating shaft 1A at both ends thereof. The rotating shaft 1A is similar to the conventional one shown in FIG. Oil film 3
It is supported on the casing 6 via B.

On the other hand, for positioning in the thrust direction,
The casing 6 is provided with a thrust oil slide bearing 5 outside the radial bearing 3, and holds a thrust disk 5A fitted to the tip of the rotary shaft 1A via an oil film 5C therebetween. The thrust disc 5A has a long hollow extension boss 5B, and the extension boss 5B is fitted in a state where the thrust disc 5A is fitted to the shaft end of the rotary shaft 1A.
Is in a state of overhang from the shaft end of the rotating shaft 1A as shown in the figure.

The casing 6 has a damper mechanism 4 together with the radial oil slide bearing 3 and the thrust oil slide bearing 5.
Is mounted, and the damper mechanism 4 is provided with a thrust disc 5
A is attached so as to enclose the extension boss 5B of A. Lubricating oil flows into and out of the lubricating oil inlet / outlet port 3A into the radial oil sliding bearing 3, the damper mechanism 4, and the thrust oil sliding bearing 5, respectively. The gas inside the casing 6 is sealed by the gas seal 2, that is, the seal portion 2C between the rotating ring 2A and the stationary ring 2B attached to the casing 6, as in the conventional case shown in FIG.
Insulated from outside air.

The non-rotating damper movable piece 4A constituting the damper mechanism 4 has high rigidity so as to smoothly move in the radial direction in the casing 6 and has a slight gap with the extension boss portion 5B of the thrust disk 5A. It is mounted so that an oil film 4D is formed. Furthermore, an appropriate gap is provided between the non-rotating damper movable piece 4A and the casing 6 to form the squeeze film 4C, and the O-ring 4B is attached to hold the damper movable piece 4A. . In addition,
The damper movable piece 4A is stopped by a pin 4E so as not to rotate in the circumferential direction.

The thrust disk 5A is shrink-fitted to the shaft end of the rotating shaft 1A so that the extension boss 5B comes in the opposite direction to the rotating body 1, and then the thrust disk 5A is firmly fitted with a fluid expansion fit (hydrofit) or the like. The oil film 4 is fitted and connected to the damper movable piece 4A.
D is formed. The extended boss portion 5B of the thrust disk is preferably made as thin as possible and lightened as long as no problem occurs in strength. The type of the oil film 4D is not limited as long as it has high rigidity.
A fixed lobe type bearing type is most suitable.

The apparatus shown in FIG. 1 has the above-described structure. Since the extended boss portion 5B of the thrust disk is surrounded by the damper mechanism 4 having a damping action against radial vibrations, the apparatus shown in FIG. When the rotating body 1 is greatly excited by the disturbance and transmitted from the rotating shaft 1A to the extended boss portion 5B of the thrust disk 5A, it is transmitted to the damper mechanism 4 via the highly rigid oil film 4D. Damper mechanism 4
Is transmitted to the non-rotating damper movable piece 4A and the casing 6 between the lubricating oil squeeze film 4C.
And the damping function by the material damping of the O-ring 4B suppresses the amplitude of the rotating shaft 1A from becoming excessive.

In particular, the extension boss portion 5B of the thrust disk 5A is attached to the shaft end of the rotary shaft 1A in an overhang state, and the extension boss portion 5B is formed as an integral body that extends the thrust disk 5A toward the non-rotating body. As a result, the amplitude of the rotating shaft 1A is reliably transmitted in an amplified form to the opposing portion of the damper movable piece 4A, effectively damped, and the rotating shaft 1A comes into contact with the radial oil sliding bearing 3 to prevent trouble. Nothing happens. Further, since the extension boss portion 5B is hollow and lightweight, the overhang portion is light and the vibration amplitude can be suppressed to a small value.

Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to these embodiments, and the shape and structure of the present invention are within the scope of the present invention described in the appended claims. It is needless to say that various changes may be made to. For example, in the above embodiment, the present invention is applied to a supporting device for a rotating body in a gas compressor. However, the present invention is not limited to a gas compressor and may be used as a supporting device for a rotating body in a pump, a vacuum pump, or the like. Applicable.

[0020]

As described above in detail, in the rotating body supporting device according to the present invention, the extension boss of the thrust disk attached to the shaft end of the rotating shaft has a damping action against radial vibration. Even if the rotating body is greatly excited due to some disturbance, the vibration is transmitted through the rotating shaft, the extended boss of the thrust disk, and the highly rigid oil film around the extended boss. The vibration is transmitted to the damper mechanism and is effectively damped by the damper movable piece in the damper mechanism, so that the amplitude of the rotating body does not become excessive.

In particular, in the support device according to the present invention, since the extension boss is formed integrally with the thrust disk attached to the shaft end of the rotation shaft, the amplitude of the rotation shaft 1A is increased from the extension boss via the oil film. The vibration is reliably transmitted to the opposing portion of the damper movable piece 4A and damped. Further, according to the present invention, when the extension boss of the thrust disk is hollow and mounted so as to overhang from the shaft end of the rotating shaft, the distance between the damper mechanism and the rotating body around the extension boss is increased. However, the amplitude of the rotating shaft in the extension boss portion is large, and the vibration of the rotating shaft can be effectively suppressed. In addition, the overhang portion is light and the vibration amplitude can be suppressed small.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a supporting device for a rotating body according to an embodiment of the present invention.

FIG. 2 is a partial vertical sectional view of a conventional rotating body support device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating body 1A Rotating shaft 2 Gas seal 3 Oil sliding radial bearing 4 Damper mechanism 4A Damper movable piece 4B O-ring 4C Squeeze film 5A Thrust disk 5B Extended boss of thrust disk 5 Oil sliding thrust bearing 6 Casing

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-187442 (JP, A) JP-A-5-118335 (JP, A) JP-A-57-168091 (JP, A) 22655 (JP, U) Japanese Utility Model 1-94647 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 29/04 F16C 17/02-17/04 F16C 27/00

Claims (2)

(57) [Claims] A rotary shaft mounted with a rotating body and supported by a radial bearing; a thrust disk mounted on an end of the rotary shaft and having an extended boss portion; and a high rigidity with respect to vibration of the extended boss portion. A rotating body support device, comprising: a non-rotating damper movable piece that follows through an oil film; and a squeeze film combined with a damper mechanism provided around the extension boss portion. 2. The apparatus according to claim 1, wherein the extension boss is hollow and overhangs from the shaft end of the rotary shaft.
A supporting device for a rotating body according to the above.