JPS5912199A - Rotary body device - Google Patents

Abstract

PURPOSE:To prevent the elimination of an interference by a method wherein a boss and a rotary shaft are coupled by a flange and the coupling is located at the outside of a casing to cool it. CONSTITUTION:A boss 6 and a rotary shaft 4 are not coupled by fitting but are coupled by a flange. Further, the flange coupling is located at the outside of a casing 1 to cool it. The flange coupling is not located in the casing 1, therefore, there is no difference of thermal expansion between the boss 6 and the rotary shaft 4 and no difference is generated in the thermal expansion of respective flanges 8, 9. According to this method, bolts for coupling the flanges will never meet the danger of being cut.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in rotary body devices, particularly rotary body devices operated in high-temperature gas.

FIG. 1 shows a conventional configuration for a blower.

In this figure, (1) is the casing of the blower, and (2) is the suction port, through which high-temperature gas is introduced.

(3) is an air outlet, and (4) is a rotating shaft, which is mainly composed of a large diameter part (41) located outside the casing and a small diameter part (42) located inside the casing. (5) is the blade, and (6) is the boss part of the blade, which is the small diameter part (42) of the rotating shaft.
) is fitted. (7) is a labyrinth provided between the casing and the rotating shaft.

In such a configuration, when the rotating shaft (4) rotates, the blades (5) rotate as a rotating body, and high-temperature gas is introduced from the suction port (2) as shown by the arrow, and from the outlet (3) as shown by the arrow. Extract to the outside as shown.

In this case, the blade (5), its boss (6), and rotating shaft, especially its small diameter portion (42), are exposed to high-temperature gas and undergo thermal expansion, but due to their materials, usually the boss (6) Since the thermal expansion is larger than that of the small diameter portion (42) of the rotating shaft, there is a drawback that the fitting condition between the two becomes loose and the interference disappears.

This invention was made in order to eliminate such drawbacks. An embodiment of the present invention shown in FIG. 2 will be described below.

In this figure, (8) is a flange formed with a boss portion ζ;
(9) is a flange formed on the rotating shaft, and (10) is a bolt that connects both flanges. In other words, the boss portion (6) and the rotary shaft (4) are connected by fitting and flange connection as in the conventional case. Moreover, this flange joint is configured to be placed outside the casing (1) and cooled. If the flange joint is located within the casing, the difference in thermal expansion between the boss and the rotating shaft will cause a difference in the thermal expansion of each flange, so there is a risk that the joint bolts will break. be.

The present invention solves these problems by locating the flange joint outside the casing.

The rest of the configuration is the same as the conventional one, so the explanation will be omitted.

This invention is constructed as described above, and the boss part and the rotating shaft are connected by a flange connection, and the connection part is located outside the casing and is cooled, so that the conventional drawbacks are completely eliminated. Additionally, there is no risk of the flange connection bolts breaking.

In the above description, the rotary body was explained as a blade of a blower, but the same effect can be achieved even if the rotary body is something like a flywheel.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional configuration of a blower, and FIG. 2 is a vertical cross-sectional view showing an embodiment of the present invention. In the figure, (1) is the casing, (2) is the inlet, (3) is the outlet, (4) is the rotating shaft, (9) is the flange of the rotating shaft, (
5) is a blade, (6) is a boss portion, (8) is a flange of the boss portion, (10) is a bolt for connection, and (7) is a labyrinth. Note that the same reference numerals indicate corresponding parts.

Claims (1)

[Claims] 1. It has a boss portion that is flanged to the rotating shaft,
1. A rotating body device comprising a rotating body that rotates in a high-temperature gas, characterized in that the flange joint portion is located outside the high-temperature gas atmosphere and cooled. 2. The rotating body device according to claim 1, wherein the rotating body is a blade of a blower.