JPS60568B2 - rotor blade bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor blade bearing device for supporting a rotor blade shaft that swings at a relatively low speed in a rotor blade variable axial flow fan or the like.

First, a conventional rotor blade bearing device will be explained based on FIGS. 1 and 2, taking a rotor blade variable axial flow fan as an example.

In Fig. 1, 1 is the main shaft of the rotor blade variable axial flow fan, 2 is the Invera hub iron-coupled to the main shaft 1, and 3 is the Invera hub 2.
A plurality of rotor blades are installed in the circumferential direction, 3A is the axis of rotor blade 3,
This wing shaft 3A is inserted in the radial direction of the Invera hub 2.

A thrust bearing 4 supports the thrust load of the rotor blade shaft 3A, and is attached to the rotor blade shaft 3A through a sleeve 5 with a nut 6 screwed into the rotor blade shaft 3A. It is filled with low viscosity lubricating oil and has a lubricating oil pack structure.

A radial bearing 8 supports the radial load of the blade shaft 3A, and this radial bearing 8 takes charge of the operating force transmitted via the connecting rod 9 and the link fork 10 when changing the mounting angle of the rotor blade 3.

These wing bearings, that is, the thrust bearing 4 and the radial bearing 8, allow the mounting angle of the wing 3 to be easily varied. Next, according to Figure 2,
The structure of the wing bearing device shown in the figure will be explained in detail.

In FIG. 2, parts given the same reference numerals as those in FIG. 1 indicate the same parts. The annular bearing box 7 has a U-shaped cross section and is fixed to the spigot part 2a of the Invera hub 2.
After attaching the packings 11 and 12 to the inner circumferential surface near the closed end, the thrust bearing 4 is assembled in the order of the outer ring 4A, the retainer 4C holding the rolling elements 4B, and the inner ring 40, and the inner ring 4D
The inner and outer ridges A and B are sealed by gaskets 11 and 12. Radial bearing 8 is inbella hub 2
It is attached to the radial bearing attachment part 2b of. In the subordinate rotor blade bearing device configured in this way, the radial bearing 8 is press-fitted and assembled in order to minimize the gap between it and the Invera hub 2, but it is difficult to operate in the limited space inside the Invera hub 2. This required special jigs and tools and was a difficult task.

In addition, in the Invera hub 2, the spigot part 2a for mounting the bearing box 7 with the thrust bearing 4 inside and the mounting part 2b for the radial bearing 8 must be precisely machined in their positional relationship, requiring high dimensional accuracy. However, this process had the disadvantage of being difficult to achieve accuracy because it involved drilling. Furthermore, since the radial bearing 12 wears out, it is necessary to periodically inspect its effectiveness, but since this work is done on-site, the workability becomes even worse than when assembling.This invention was made based on the above-mentioned drawbacks. By simplifying the structure of the rotor blade bearing, we have made it easier to process the blade bearing attachment part of the Invera hub. Furthermore, we have created a blade bearing device that also improves the workability of assembling and disassembling the rotor blade bearing. The thrust bearing that supports the thrust load of the rotor blade shaft is covered with an annular bearing box, and the innermost surface of the bearing box is filled with lubricating oil. A sleeve-shaped oil-free radial bearing is provided in the blade, and the radial load of the wing shaft is supported by this radial bearing.

Hereinafter, one embodiment of the rotor blade bearing device of the present invention will be described with reference to FIG.

In this figure, parts given the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts. Outer ring 4A,
The thrust bearing 4, which is composed of a rolling body 4B, a retainer 4C, and an inner ring 40, is covered with an annular bearing box 7, which is filled with lubricating oil. The inner light part of the bearing box 7 is the rotor blade shaft 3
A step 7a is formed which extends in the outer circumferential direction of the Invera hub 2 along the line A and engages with the Invera hub 2, and an oil-free radial bearing portion 13 is provided on the innermost surface thereof. In this embodiment, a bush mounting part 7b is formed on the innermost folding surface of the bearing box 7, and a radial bearing part 13 is installed by press-fitting an oil-free radial bearing bush into this push mounting part 7b. is forming. With this configuration, the thrust bearing 4 that supports the thrust load of the rotor blade shaft 3A and the radial bearing section 13 that supports the radial load of the rotor blade shaft 3A are both attached to the bearing box 7 and are integrated into an integrated unit. It becomes a wing-operated bearing. The bearing box 7 is positioned with respect to the Invera hub 2 by using the step 7a of the inner diameter portion extending in the outer circumferential direction of the Invera hub 2. There is no need to process the pilot part 2a and the radial bearing mounting part 2b for this purpose.
That is, since the thrust bearing 4 and the radial bearing part 13 are configured to be positioned at only one place, the step 7a of the bearing box 7, the connection between the pilot part 2a and the radial bearing mounting part 2b is different from that in the conventional device. High-precision machining is not required,
Processing of the Invera hub 2 becomes extremely easy. Further, since the radial bearing part 13 is attached to the bearing box 7, the thrust bearing 4 and the radial bearing part 13 can be assembled in advance as a bearing unit, and therefore, the assembly and disassembly work into the Invera hub 2 is easy. Furthermore, since the bearing bush of the radial bearing portion 13 can be disassembled and assembled outside the machine, the workability of disassembly and assembly is also significantly improved. As explained above, the wing bearing device of the present invention includes a radial bearing portion that supports the radial load of the wing shaft on the innermost surface of the annular bearing box that covers the thrust bearing that supports the thrust load of the wing shaft. With this structure, it is extremely easy to process the rotor blade bearing attachment part of the Invera hub, and the workability of assembling and disassembling the blade bearing, especially the radial bearing part, is also significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the main parts of a rotor blade variable axial flow fan equipped with a subordinate rotor blade bearing device, Fig. 2 is an enlarged sectional view of the rotor blade bearing device part shown in Fig. 1, and Fig. 3 The figure is a longitudinal sectional view of essential parts showing an embodiment of the rotor blade bearing device of the present invention. 1... Main shaft, 2... Invera hub, 3... Moving blade, 3A... Moving blade shaft, 4... Thrust bearing, 7... Bearing box, 13.
...Radial bearing section. Silk figure *Z drawing 3 figure

Claims (1)

[Claims] 1 In a bearing device that supports a rotor blade shaft that is inserted in the radial direction of an impeller hub fitted to a main shaft, the thrust bearing that supports the thrust load of the rotor blade shaft is covered with an annular bearing box, and a It is filled with lubricating oil, and a sleeve-shaped oil-free radial bearing is installed on the innermost surface of the bearing box.
A rotor blade bearing device characterized in that the radial bearing portion is configured to support the radial load of the rotor blade shaft.