JPS6385202A - Blade of axial fluid machinery - Google Patents

Abstract

PURPOSE:To enhance the degree of freedom in terms of fitting an axial fluid machinery blade and facilitate its processing, by allowing an axial fluid machinery blade, the blade part of a mobile blade, in particular, to be formed of a fibre-reinforced plastics, with the front part of a blade handle or a part thereof formed of metal. CONSTITUTION:This blade is composed of an effective blade section 1 and the blade part of positioning boss 4 made of FRP and combined together in one body. On the other hand, a handle part 2 comprising sections that are difficult to be machine-worked by other than depending largely on a lathe machining, such as a fixing screw section 7 and a bearing support section 6, is made of a metal with adequate strength and workability. Both parts are combined together in one body by bonding the positioning boss 4 for setting an angle to a corresponding boss bore provided in the handle part 2, through the intermediary of an epoxy adhesive. The aforesaid constitution will be intended to reduce the cost as well as to improve fitting freedom thereof.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a blade for an axial flow fluid machine, particularly a variable blade.
〇 (Prior art) Regarding the structure of blades manufactured using FtlP (JJ fiber-reinforced plastic) Blades of axial flow fluid machines 1 For example, materials for blades of compressors include:
Stainless steel and other Fe-based alloys, A1 alloys, titanium alloys, etc. are widely used. ◎Since strong centrifugal stress is applied to the rotor blades of axial flow compressors, high-strength materials such as stainless steel are used, and especially light weight is required. In some cases, titanium alloys are used.

Since the strength required for stator blades is relatively low, A1
Alloys are sometimes used, for example, in jet engine structures M4F174 to PIFIO.

Materials commonly used in aviation gas turbine engines are detailed.

In addition, in industrial gas turbine compressors, etc., stainless steel and other materials have been widely used because restrictions on the amount of M have become stricter. Therefore, the blade length of the compressor's low-pressure stage is increasing, and titanium alloys and hollow types are being introduced to reduce centrifugal stress, but all of these methods are extremely expensive. It is.

On the other hand, FRP has a high specific strength and is very attractive as a blade material for axial flow compressors, and although various efforts have been made to put it into practical use, it suffers from the drawback of being weak against impact forces. This is the reason why FRP is not popular as a material for aviation gas turbine compressors.The characteristics of FRP include its high specific strength. In addition to being weak against shock and shock, it has the advantages of excellent formability, ability to give directionality to strength, low cost, relatively low usable temperature limit, weakness to concentrated loads, and difficulty in machining. The shortcomings can be cited as vital. In axial flow turbomachinery, these properties can be utilized in relatively low-speed, low-pressure, low-temperature compressors, fan blades, and low-pressure stage blades of high-speed compressors with sufficient filters. Some of them have been put into practical use □ (Problems to be solved by the invention) The problem when using FRP 'i as a different material for axial flow fluid machinery is to determine where to apply it by taking advantage of its properties. Another problem is how to join it with other metal parts. In other words, since FRP is weak against concentrated loads, it is difficult to join with bolts, rivets, etc.

It was difficult to fix R using conventional methods such as Daptail, Christmas, etc. However, all of these methods require precision in processing and are difficult and expensive. Also, it is difficult to apply to variable blades.

For this reason, there is a means to inexpensively fix a single wing made of F'RP.
Additionally, there was a desire for a means to use FRP wings as variable-mount inner wings.

The present invention improves the drawbacks of the above-mentioned prior art by integrating a metal handle and an FRP wing. [Structures of the Invention] C. Means for Solving the Problems) The wing for a trickle fluid machine according to the present invention has a shape that is generally difficult to machine, and a centrifugal FRP has excellent formability due to the application of force and gas force.

The wing parts, which can take advantage of characteristics such as opening strength and anisotropy, are made of FRP, and require machining such as threading and cutting for attachment, and parts that are difficult to process with FRP are made of metal. It has an integrated structure.

(Function) By making the wing part'i FRP with the handle part made of metal, it is possible to produce a lightweight and strong wing with a high degree of freedom in how it can be mechanically attached to the rotor or casing of the compressor. In the case of variable blades, the handle often has a long column-shaped part that becomes the axis of rotation, and this part is often combined with a bearing. Therefore, the tolerance of the diameter of this part is It is difficult to mold with normal FRP.@Also, this part may have a threaded part for fastening, but this is also difficult to mold with FRP.

Generally, the handle part often has many irregularities due to installation, and in such places, FRP may cause molding defects,
It is conceivable that it will become extremely weak due to stress concentration.

In the blade according to the present invention, since the attachment part with the above-mentioned problems is made of metal, such problems can be avoided, and a blade that takes advantage of the characteristics of FRP can be manufactured. (Example) ) Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 shows a five-blade effective section 1 showing a first embodiment of the present invention.
The wings S of the first positioning boss 6 are integrally molded with F'RP. Between these, the cross-sectional changes are relatively gradual;
There are no problems with manufacturing from FRP in terms of molding and strength.On the other hand, the mounting screw part 3. The handle portion 2, which includes parts such as the bearing support portion 7 that are difficult to manufacture except by machining mainly using a lathe, is made of metal with sufficient strength and workability. In order to firmly fix the positioning boss 6 for setting the angle and the corresponding boss hole provided in the gold FA handle, adhesive is applied to the FRP and metal. Using an epoxy adhesive with excellent properties is one way to effectively utilize the present invention.

FIG. 2 shows a second embodiment of the invention. In the first embodiment, it takes time and effort to join the wing part and the handle part, and problems may arise in manufacturing. Furthermore, if bonding by adhesive is used, problems may arise in terms of quality control and strength. In the first embodiment, F
The handle that engages with the RP has an uneven surface, and by integrally molding it with the FRP, the uneven portion is embedded in the FRP H and is fixed. The wings and handle can be fixed to. In the embodiment shown in FIG. 2, a stepped portion 9 and a knurling portion 10 are provided as the unevenness, and are fixed with sufficient strength both in the tensile direction and in the torsional direction.

It is clear that the embodiments of the present invention have been described above, and the present invention is not limited to the present invention.
Since the mounting part and handle part are made of FRP and made of metal and integrated, there is a higher degree of freedom in installation compared to the conventionally used wings that were made only of FRP, and they were made only of metal. It is possible to provide blades that are lighter and cheaper than other blades, and can also reduce the number of processing steps.

[Brief explanation of the drawing]

Figure M1 is a perspective view of the first embodiment of the present invention, Figure 22 is a perspective view of the embodiment of the flute chamber of the present invention, and Figure 3 is a perspective view of an example of a conventionally used FRP blade. The diagram is 0, 1...
・Blade effective part, 2... Handle part, 3... Variable stationary blade rotation center, 4... Positioning boss, 5... Blade attachment part, 6...
Bearing support part, 7...Mounting screw part, 8...Variable link mounting part, 9...Stepped part, 10...Knurling part, 11...Dovetail 0 Agent Patent attorney Nori Chika Yudo Takehana Kikuo Figure 1 Figure 2

Claims (2)

[Claims] (1) A wing for an axial flow fluid machine, characterized in that the wing is made of fiber-reinforced plastic, and all or part of the wing handle is made of metal. (2) Claim 1, characterized in that the metal portion of the wing handle has an uneven portion near one end surface in the axial direction, and the uneven portion is embedded and molded in the wing portion. The blade of the axial fluid machine described.