JPH0660701U - Integrated wing wheel - Google Patents

Abstract

(57) [Summary] [Construction] In an integrated vane wheel in which a disk 9 and moving blades 10 provided at substantially equal intervals on the outer peripheral surface of the disk 9 are integrally formed, a disk outer peripheral surface leading edge 12 is provided for each moving blade. 10 is located at the blade root front end 13 and the disk outer peripheral surface trailing edge 14 is located at the blade root rear end 15 of each moving blade 10, and the disk outer diameter concave section is gently connected from the disk outer peripheral surface front edge 12 to the disk front end surface 16. From the front annular curved surface 17 having a curved shape and the disk outer peripheral surface rear edge 14 to the disk rear end surface 1
8 is provided with a rear annular curved surface 19 which is gently continuous and has a concave curved shape in the cross section in the disk radial direction. [Effect] By providing the front annular curved surface and the rear annular curved surface, stress concentration occurring at the blade root front end and the blade root rear end of the moving blade is suppressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an integrated impeller.

[0002]

[Prior art]

 For impellers used in axial compressors and turbines of jet engines and the like, dovetails formed at the base end of the rotor blade are installed in the rotor blade embedding groove cut in the outer peripheral portion of the disk of the annular disc. In addition to the assembly type impeller in which the blades are fitted, there is an integral type impeller in which the rotor blade and the disk are integrally formed.

As a means for manufacturing an integral type impeller, there is an electrolytic processing method disclosed in Japanese Patent Publication No. 1-222820.

In the production of the integral impeller by the electrolytic processing method, as shown in FIG. 4, the tool 1 having a blade forming surface that matches the ventral surface and the back surface of the moving blade to be formed is used as the cathode, and the integral type impeller is used. Using the annular metal material 2 to be an impeller as an anode, the tool 1 is made to approach the metal material 2 while ejecting the electrolyte a from the tool 1, and a current is conducted between both electrodes to make the tool 1 By performing electric discharge machining with a large current density with the metal material 2, the moving blade 3 is formed as shown in FIGS. 4 to 6.

When the blades 3 are successively formed on the metal material 2 in this manner, the portion of the metal material 2 near the center where the electrolytic processing is not performed becomes the annular disk 4.

[0006]

[Problems to be solved by the device]

 Conventionally, in the integrated impeller manufactured by electrolytic machining, the shape of the tool 1 is designed for machining so that electrode machining is easy, so that the front-back length L of the blade root of the rotor blade 3 is The thickness of the disc outer peripheral surface (the dimension in the front-rear direction on the disc outer peripheral surface) T is large, and the disc outer peripheral surface front edge 5 is located on the front side A side of the blade root front end 6 of the rotor blade 3, and the disc outer peripheral surface rear edge is 7 is located on the rear B side of the blade root rear end 8 of the moving blade 3. On the other hand, the rotor blade 3 is likely to be heated by the flow of high-temperature combustion gas, whereas the disc 4 is less likely to be heated than the rotor blade 3, and compared to the blade root front end 6 of the rotor blade 3. The temperature at the rear end 8 of the blade root is lower.

Therefore, when the temperature of the combustion gas is raised to increase the output of the engine, the difference in thermal expansion between the moving blade 3, the disk 4, the blade root front end 6 and the blade root rear end 8 becomes larger. At the same time, it is expected that an excessive stress concentration will occur at the blade root front end 6 and the blade root rear end 8 of the rotor blade 3 due to the increase in centrifugal force resulting from the improvement in the rotational speed of the turbine disk.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide an integrated impeller capable of suppressing stress concentration at the blade root front end and the blade root rear end of a moving blade. There is.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, in the integrated impeller of the present invention, an integrated impeller in which an annular disc and rotor blades provided at substantially equal intervals on the outer peripheral surface of the disc are integrally formed, The front edge of the disk outer peripheral surface is located at the front end of the blade root of each blade, and the rear edge of the disk outer peripheral surface is located at the rear end of the blade root of each blade. A front annular curved surface having a concave curve shape and a rear annular curved surface having a concave curve shape in the disk radial direction are provided which are smoothly connected from the trailing edge of the disk outer peripheral surface to the disk rear end surface.

[0010]

[Action]

 Since a front annular curved surface is formed between the disk outer peripheral surface front edge and the disk front end surface, and a rear annular curved surface is formed between the disk outer peripheral surface rear edge and the disk rear end surface, the rotor blade temperature The concentration of stress generated at the blade root front end and blade root rear end of the rotor blade due to the centrifugal force that increases due to the rise and higher disk rotation is suppressed.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of an integrated impeller of the present invention, in which 9 is an annular disk and 10 is a moving blade.

The moving blades 10 are provided on the outer peripheral surface 11 of the disk 9 at substantially equal intervals in the disk circumferential direction, and each moving blade 10 is formed integrally with the disk 9.

The disk outer peripheral surface leading edge 12 is located at the blade root front end 13 of each rotor blade 10, and the disk outer peripheral surface trailing edge 14 is located at the blade root rear end 15 of each rotor blade 10.

Further, between the disc outer peripheral surface front edge 12 and the disc front end face 16, there is formed a front annular curved surface 17 which is smoothly continuous and has a concave curved shape in a disc radial direction cross section. A rear annular curved surface 19 is formed between the trailing edge 14 of the outer peripheral surface of the disk and the trailing end surface 18 of the disk, which is smoothly continuous and has a concave curved cross section in the disk radial direction.

In manufacturing the integrated impeller having the above-described shape, the metal material 2 is subjected to electrolytic processing to form the integrated impeller as shown in FIG. The front annular curved surface 17 and the rear annular curved surface 19 are formed on the disk 9 by means of electric discharge machining or the like, or the front annular curved surface is previously formed on the metal material 2 by means such as machining. The surface 17 and the rear annular curved surface 19 are formed.

In the integrated impeller having the above-mentioned configuration, the front annular curved surface 17 having a concave curved shape is provided between the disk outer peripheral surface front edge 12 and the disk front end surface 16, and the disk outer peripheral surface rear Since the rear annular curved surface 19 having a concave curve shape is formed between the edge 14 and the disk rear end surface 18, the rotor blade 10 is increased by the centrifugal force increased by the temperature rise of the rotor blade 10 and the rotation speed of the turbine disc. It is possible to suppress stress concentration occurring at the blade root front end 13 and the blade root rear end 15.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0019]

[Effect of device]

 As described above, the integrated impeller of the present invention can exert various excellent effects as described below.

(1) The front edge of the disk outer peripheral surface is located at the blade root front end of each blade, and the disk outer peripheral surface trailing edge is located at the blade root rear end of each blade, and between the disk outer peripheral surface front end and the disk front end. The front annular curved surface is formed, and the rear annular curved surface is formed between the trailing edge of the outer peripheral surface of the disk and the rear end surface of the disk.Therefore, centrifugal force increases due to the temperature rise of the rotor blade and the high rotation of the turbine disk. As a result, the concentration of force generated at the blade root front end and blade root rear end is suppressed.

(2) Since the stress concentration at the blade root front end and the blade root rear end due to the temperature rise of the moving blade is suppressed, it becomes possible to raise the temperature of the combustion gas and increase the engine output. Can be achieved.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the integrated impeller of the present invention.

FIG. 2 is a partial vertical cross-sectional view showing an embodiment of the integrated impeller of the present invention.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a partially cutaway perspective view showing an example of a conventional integrated impeller.

FIG. 5 is a partial vertical cross-sectional view showing an example of a conventional integrated impeller.

6 is a VI-VI arrow view of FIG.

[Explanation of symbols]

 9 disk 10 moving blade 12 disk outer peripheral surface front edge 13 blade root front end 14 disk outer peripheral surface trailing edge 15 blade root rear end 16 disk front end surface 17 front annular curved surface 18 disk rear end surface 19 rear annular curved surface

Claims (1)

[Scope of utility model registration request] 1. An integrated vane wheel in which an annular disk and moving blades provided at substantially equal intervals on the outer peripheral surface of the disk are integrally formed, and a front edge of the outer peripheral surface of the disk is provided at a blade root front end of each blade. A disk outer peripheral surface trailing edge is positioned at each blade root rear end of each blade, and the front annular curved surface having a concave curved shape in a disk radial section which is smoothly connected from the disk outer peripheral surface leading edge to the disk front end surface. An integral type impeller, characterized in that a rear annular curved surface is provided which is smoothly continuous from the trailing edge of the outer peripheral surface of the disc to the trailing end face of the disc and has a concave curved cross-section in the disc radial direction.