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Turbine rotor and turbocharger equipped with the turbine rotor

A technology of turbine rotors and turbine impellers, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as complicated balance correction, inability to produce in large quantities, and inability to decide, and achieve the effect of reducing the risk of rupture

Active Publication Date: 2018-06-19
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, since such a technique does not process the turbine impeller 5 itself, but cuts and tightens the impeller nuts that fix the blades 40 for self-alignment, it is only suitable for correcting the rotational balance on the side of the compressor impeller where the rotor shaft and the impeller are separated.
[0013] In addition, in the prior art described above, "the impeller nut is rotated so as to exceed the primary resonance point at which the amplitude of the vibration generated on the impeller is the largest, and the impeller nut is removed from the It is cut continuously in the front direction and self-aligning", therefore, there is a problem that the balance correction is complicated, and in particular, there is a problem that the delineated position of the balance correction part cannot be determined unless the impeller nut can be rotated, and it cannot be used for mass production.
[0014] In addition, the above technique is fundamentally different from the present invention in which the balance cutting portion 11 is provided on the back side of the turbine wheel 5 because the rotation balance is corrected by laser cutting the front side of the impeller nut.

Method used

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  • Turbine rotor and turbocharger equipped with the turbine rotor
  • Turbine rotor and turbocharger equipped with the turbine rotor
  • Turbine rotor and turbocharger equipped with the turbine rotor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0067] figure 2 It is a sectional view along the rotation axis CC of the turbocharger 1 incorporating the turbine rotor of the present invention.

[0068] First, an outline of the configuration of the turbocharger 1 will be described by taking a turbocharger for a passenger car engine as an example. In this turbocharger 1, a scroll portion 17 is formed in a spiral shape on the outer peripheral portion of the turbine casing 3, and a turbine wheel 5 is arranged at the center portion of the spiral shape, and the turbine wheel 5 and the turbine rotor shaft 7 are arranged. One ends of the rotors are joined together by solder to form the turbine rotor 19 . In the turbine rotor 19, a bearing housing 10 having a bearing 9 for rotatably supporting the turbine rotor shaft 7 and a compressor housing 15 accommodating a compressor impeller 13 are arranged adjacent to each other in the direction of the rotation axis CC.

[0069] In addition, a pair of left and right bearings 9 , 9 that r...

example 1

[0081] For example, in image 3 In the prior art of (A), the outer diameter of the turbine impeller is φ52mm, the maximum diameter (JKmax) of the impeller installation side of the rotor shaft is φ20mm, and the turbine impeller 5 with a fan diameter of φ34mm is balanced cutting minimum diameter BCminφ22mm, balanced cutting The maximum diameter BCmaxφ32mm (balanced cutting width W'=5mm) and the ratio of the maximum diameter / sector diameter=94% of the balanced cutting position and balanced cutting are performed, and the probability of cracking is approximately 100%. (sample: 100 pieces)

Embodiment 1

[0083] Secondly, if image 3 As shown in (B), the minimum diameter of balanced cutting BCmin is fixed at φ22mm, and the maximum diameter of balanced cutting BCmax is changed from φ32mm (balanced cutting width = 5mm) to φ29mm (balanced cutting width w = 3.5mm) and the maximum diameter / sector diameter of the balanced cutting position =85% ratio implements balanced cutting, and the fracture occurrence rate is reduced from 100% to 30%. (sample: 100 pieces)

[0084] also, image 3 (C) is image 3 (A) Axis section view of (B).

[0085] Next, an attempt was made to investigate the cutting depth Dp at the position of the balanced cutting maximum diameter BCmax where the above-mentioned cracks did not occur and where the above-mentioned cracks occurred.

[0086] Specifically, with regard to the balanced cutting maximum diameter BCmaxφ29mm (balanced cutting width=3.5mm), 30 pieces that did not cause the above-mentioned cracks were extracted (in addition, the plate thickness t was al...

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Abstract

An object of the present invention is to provide a turbine rotor and a turbocharger using the turbine rotor. The balance correction portion provided on the back side of the turbine impeller (5) has a clearly defined position and can perform balanced cutting evenly even in mass production. Or thickened, the turbine rotor is provided with: a turbine impeller (5), which is precision cast from titanium-aluminum alloy, with multiple blades (40) circumferentially provided around the hub (50) passing through the impeller rotation axis, and All adjacent blades (40) are cut to form an arc-shaped notch-shaped sector portion (30); the rotor shaft (7) is fixed on the back side of the hub of the turbine impeller along the impeller rotation axis CC Set; a balance cutting portion (11) is provided on the back side of the hub of the turbine impeller along the circumferential direction of the rotating impeller, wherein the minimum diameter of the balance cutting BCmin is larger than the maximum diameter of the impeller installation side of the rotor shaft, and the maximum diameter of the balance cutting is BCmax is smaller than the fan diameter S of the turbine impeller, and is set at a position where "the plate thickness t from the back of the impeller to the hub surface is 1.75t≧w" (w: radial width of the circumferential area (balanced cutting)) area.

Description

technical field [0001] The present invention relates to a turbine rotor provided with an unbalance correction portion along the circumference of the impeller on the back of the turbine impeller and a turbocharger incorporating the turbine rotor, in particular to a turbine impeller manufactured by precision casting titanium-aluminum alloy A turbine rotor with an unbalance correction section on the back side. Background technique [0002] based on figure 1 The structure of the turbine rotor which is the premise technology of this invention is demonstrated. [0003] figure 1 It is a partial front view of the radial turbine rotor, which is composed of the turbine rotor shaft 7 and the turbine impeller 5. The turbine impeller 5 is provided with a truncated conical hub 50 on the impeller rotation axis CC, and on the outer periphery of the hub 50 A plurality of blades (blades) 40 are provided at approximately equal intervals in the circumferential direction. In addition, arc-sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B39/00F02B39/16
CPCF01D5/027F01D5/04F01D5/048F01D5/28F05D2220/40F05D2300/174
Inventor 大坪瞳新井贵中川大志山口秀树吉田正和
Owner MITSUBISHI HEAVY IND LTD