JPS6138194A - High speed rotor - Google Patents

Abstract

PURPOSE:To improve the reliability of rotor with respect to vibration and strength by minimizing the hollow inner diameter at the central portion in axial direction of rotor while enlarging toward terminalboard sections thereby preventing the outer deformation of vane and occurrence of local stress in the rotor. CONSTITUTION:A rotor is formed such that the hollow inner diameter will be shortest at the central portion in axial direction of rotor shaft 1 while increase toward the terminalboard sections 2a, 2b. Even when rotating the rotor shaft 1 with high speed, the hollow inner diameter is made shortest at the central portion in axial direction where there is no restriction of the terminalboards 2a, 2b in radial direction while enlarges toward the terminalboards 2a, 2b. The deformation in radial direction is uniformed at each position in axial direction as shown by dot line. consequently, external deformation of vane 4 will never occur while local stress in axial direction will never occur at the root of the vane 4 resulting in prevension of vibration and improvement of strength.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotor that rotates at high speed, and particularly to a high-speed rotation suitable for preventing out-of-plane deformation of blades attached to the outer peripheral edge of the rotor. It is.

[Background of the invention]

Rotating rotors such as turbo molecular pumps rotate between 10,000 and 6000 revolutions per minute.
It rotates at a high speed of 10,000 revolutions to exhaust gas molecules in the molecular region, and is deformed in the radial direction due to the action of cardiac force.

To explain the figures, FIG. 3 is a longitudinal sectional view of the rotating rotor, and FIG. 4 is an enlarged view of the blade root portion of FIG. 3. ' End plates 2a are provided at both ends of the axially symmetrical hollow rotating cylinder 1.

2b are joined by bolts 3 and the like to form a rotor shaft. Four rows of blades are attached to the outer peripheral edge of the rotor shaft at regular intervals in the axial direction. In addition, the end plates 2a, 2b
Central shafts 5a and 5b are fixed to the center shafts 5a and 5b by means such as welding.

When the rotor configured as described above is rotated at high speed, centrifugal force acts on the root portion of the blade 4, causing radial deformation on the rotor axis. However, the rotor shaft 1 near the end plates 2a and 2b deforms as shown by the dotted line in the figure due to the restraint of radial deformation of the end plates.

Therefore, although the deformation of the blades near the end plates 2a and 2b is slight, out-of-plane deformation occurs at the axial center of the rotor shaft.
Moreover, there is a large local area at the base of the feather + 1.
1979-117919 is related to this type of device.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-speed rotating rotor configured so that radial deformation of blades due to centrifugal force is uniform during high-speed rotation.

[Summary of the invention]

In order to achieve the above object, the present invention has a rotor shaft that constitutes a high-speed rotating rotor, in which the hollow inner diameter is minimum at the axial center of the rotor shaft, and the hollow inner diameter is expanded toward the end plates. , which takes technical measures that can make it possible to increase the speed of the rotating rotor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In the figures, the same or corresponding parts as in FIGS. 3 and 4 are given the same reference numerals and explained. FIG. 1 is a longitudinal sectional view of a high-speed rotating rotor of the present invention, and FIG. 2 is an enlarged view of the blade root portion of FIG. 1.

In the figure, end plates 2a and 2b are firmly joined to both ends of a hollow rotating cylinder 1 formed axially symmetrically with bolts 3 or the like to constitute a rotor shaft. The hollow inner diameter is formed to be minimum at the center in the axial direction of the rotor shaft, and the hollow inner diameter is formed to expand toward the end plates 2a and 2b. Four rows of blades arranged at regular intervals in the axial direction are fixed to the outer peripheral edge of the rotor shaft 1. End plate 2a.

Central shafts 5a and 5b are respectively fixed to 2b by welding means or the like.

Since the present invention has the above configuration, even when the rotor is rotated at high speed on the rotor shaft, the hollow inner diameter is minimized in the axial center part where the end plates 2a and 2b are not constrained in the radial direction.
, 2b, so that the radial deformation is made uniform at each axial position, as shown by the dotted line in FIG. As a result, each blade 4 does not undergo out-of-plane deformation, and local stress in the axial direction does not occur at the root of the blade 4.

〔Effect of the invention〕

As explained above, according to the present invention, the hollow inner diameter is minimized at the axial center of the rotor that rotates at high speed, and the inner diameter is expanded toward the end plate. Since the generation of local stress in the rotor is avoided, there is an effect that the reliability with respect to vibration and strength of the rotating rotor is improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a high-speed rotor according to the present invention, FIG. 2 is an enlarged view of the blade root portion of FIG. 1, FIG. 3 is a longitudinal sectional view of a conventional high-speed rotor, and FIG. FIG. 4 is an enlarged view of the blade root portion of FIG. 3; 1...Hollow rotating cylinder, ↓...Rotor shaft, 2a, 2b
... end plate, 4... vane.

Claims (1)

[Claims] In a high-speed rotating rotor comprising a rotor shaft constituted by an axially symmetrical hollow rotating cylinder with end plates joined to both ends, and a row of blades attached at regular intervals in the axial direction on the outer peripheral edge of the rotor shaft. A high-speed rotating rotor, characterized in that the hollow inner diameter is formed to be minimum at the axial center of the rotor shaft and expand toward the end plate.