EP0267405A2 - Radialturbinenrad - Google Patents

Radialturbinenrad Download PDF

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Publication number
EP0267405A2
EP0267405A2 EP87114238A EP87114238A EP0267405A2 EP 0267405 A2 EP0267405 A2 EP 0267405A2 EP 87114238 A EP87114238 A EP 87114238A EP 87114238 A EP87114238 A EP 87114238A EP 0267405 A2 EP0267405 A2 EP 0267405A2
Authority
EP
European Patent Office
Prior art keywords
vane
axis
line
cross
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87114238A
Other languages
English (en)
French (fr)
Other versions
EP0267405A3 (de
Inventor
Eito C/O Nagasaki Technical Institute Matsuo
Nobuyasu Sagamihara Machinery Works Matsudaira
Koichiro Nagasaki Shipyard&Engine Works Imakiire
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0267405A2 publication Critical patent/EP0267405A2/de
Publication of EP0267405A3 publication Critical patent/EP0267405A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/04—Blade-carrying members, e.g. rotors for radial-flow machines or engines
    • F01D5/043—Blade-carrying members, e.g. rotors for radial-flow machines or engines of the axial inlet- radial outlet, or vice versa, type
    • F01D5/048—Form or construction

Definitions

  • This invention relates to a radial-flow turbo machines such as superchargers, gas turbines or radial compressors.
  • FIG. 4 One example of the structure of a conventional radial-flow turbine impeller is shown in Fig. 4 in which the impeller 10 includes plurality of moving vanes 100 joined to a disc 200 and rotates around an axis 500.
  • each vane and the joining line between disc 200 and vane 100 are referred to as the front edge 110, rear edge 120, shroud line 300, and hub line 400, respectively.
  • each moving vane 100 on the side of the rear edge 120 after the line X-X substantially bisecting the axial length of the vane is formed by a curved surface.
  • each moving vane 100 at a distance of Z in a cylindrical cross section VI-VI takes the form determined by the function f (Z), and the thickness of the vane is added thereto to form a back surface 130 and a stomach surface 140 thereof.
  • the moving vanes 100 each drawn in a cross section parallel to the cross section V-V, namely, orthogonal to the axis of rotation 500, are formed radially from the axis 500.
  • the center lines 150 of the vanes pass necessarily through the axis 500. Design is made such that no bending stresses due to the centrifugal force produced by rotation of the impeller will not be produced in any cross section orthogonal to the axis 500.
  • Fig. 7 is a back view of a moving vane 100 obtained when the vane 100 is viewed from the side of its back edge 120 and the arrow shows the direction in which the centrifugal force acts.
  • the vane 100 has the form represented by Equation (1), so that as shown in Fig. 7, the centrifugal force in each cross section acts along the center line 150 and no bending stress will be produced in each cross section.
  • the vane elements 160, 170 and 180 constituting the portions between these cross sections are interconnected one to the other, so that for the vane element 160, it is pulled by the elements 170 and thus a bending stress is produced, which is substantially pro­portional to the magnitude of y in Equation (1), because the portion 160 is pulled by the portion 170.
  • a bending stress is produced, which is substantially pro­portional to the magnitude of y in Equation (1), because the portion 160 is pulled by the portion 170.
  • a tensile stress ⁇ t produced by the above bending stress is superposed on a tensile stress ⁇ T pro­duced by the centrifugal force acting along the center line at the root 161 of the vane element 160 on the side of its stomach surface and a compression stress ⁇ b is superposed on the tensile stress ⁇ T at the root 162 of the vane portion 160 on the side of its back surface.
  • each moving vane is inclined in advance toward its back surface at an angle substantially proportional to y of Equation (1).
  • a force due to the centrifugal force acts on each moving vane so as to bend the vane from its back surface toward its stomach surface.
  • a compression stress and a tensile stress are superimposed on the corresponding centrifugal force at the stomach surface and back surface side roots, respectively, to thereby reduce the tensile stress at the stomach surface side root produced by the resultant force of the centrifugal forces.
  • reference numeral 10 denotes an impeller; 200, a disc of the impeller; and 100, a plurality of moving vanes fixed equispacedly to the periphery of the disc.
  • Reference numeral 110 denotes the front edge of the moving vane 100; 120, the rear edge of the vane; 300, a shroud line; and 400, a hub line; and 500, the axis of rotation.
  • each moving vane 100 on the side of rear edge 120 after the cross section X-X passing through substantially the midpoint of the axial length of the vane has a curved surface represented by the afore­mentioned function f (Z) having an order equal to at least 2, in an exploded cylindrical plane.
  • This invention has the above structure and according to this invention, a bending stress due to a centrifugal force accompanied by an increase, toward the rear edge of a moving vane, in the angle at which the vane is mounted is cancelled by the bending action due to the vane being inclined toward its back surface, thereby alleviating the bending force on the entire vanes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Turbines (AREA)
EP87114238A 1986-11-12 1987-09-29 Radialturbinenrad Withdrawn EP0267405A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP26903186A JPS63124806A (ja) 1986-11-12 1986-11-12 輻流タ−ボ機械
JP269031/86 1986-11-12

Publications (2)

Publication Number Publication Date
EP0267405A2 true EP0267405A2 (de) 1988-05-18
EP0267405A3 EP0267405A3 (de) 1990-01-10

Family

ID=17466715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114238A Withdrawn EP0267405A3 (de) 1986-11-12 1987-09-29 Radialturbinenrad

Country Status (4)

Country Link
EP (1) EP0267405A3 (de)
JP (1) JPS63124806A (de)
DE (1) DE267405T1 (de)
ES (1) ES2002603A4 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5112195A (en) * 1988-10-19 1992-05-12 Rolls-Royce Plc Radial flow rotors
US20110206518A1 (en) * 2008-09-05 2011-08-25 Alstom Hydro France Francis-type runner for a hydraulic machine, hydraulic machine including such a runner, and method for assembling such a runner
CN102337932A (zh) * 2011-09-27 2012-02-01 中国北车集团大连机车研究所有限公司 径流涡轮
US11313229B2 (en) 2016-03-31 2022-04-26 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Impeller, turbocharger, and method for forming flow field for gas in impeller and turbocharger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610775A (en) * 1969-07-09 1971-10-05 Judson S Swearingen Turbine wheel
EP0080258A2 (de) * 1981-11-25 1983-06-01 Kabushiki Kaisha Toshiba Radialturbinenläufer
DE3418946A1 (de) * 1984-05-22 1985-11-28 Elmar Dipl.-Ing. Putz (FH), 8380 Landau Reaktions-radial-turbine
GB2166808A (en) * 1984-11-10 1986-05-14 Daimler Benz Ag A turbine rotor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610775A (en) * 1969-07-09 1971-10-05 Judson S Swearingen Turbine wheel
EP0080258A2 (de) * 1981-11-25 1983-06-01 Kabushiki Kaisha Toshiba Radialturbinenläufer
DE3418946A1 (de) * 1984-05-22 1985-11-28 Elmar Dipl.-Ing. Putz (FH), 8380 Landau Reaktions-radial-turbine
GB2166808A (en) * 1984-11-10 1986-05-14 Daimler Benz Ag A turbine rotor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5112195A (en) * 1988-10-19 1992-05-12 Rolls-Royce Plc Radial flow rotors
US20110206518A1 (en) * 2008-09-05 2011-08-25 Alstom Hydro France Francis-type runner for a hydraulic machine, hydraulic machine including such a runner, and method for assembling such a runner
US9175662B2 (en) * 2008-09-05 2015-11-03 Alstom Renewable Technologies Francis-type runner for a hydraulic machine, hydraulic machine including such a runner, and method for assembling such a runner
CN102337932A (zh) * 2011-09-27 2012-02-01 中国北车集团大连机车研究所有限公司 径流涡轮
US11313229B2 (en) 2016-03-31 2022-04-26 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Impeller, turbocharger, and method for forming flow field for gas in impeller and turbocharger

Also Published As

Publication number Publication date
JPS63124806A (ja) 1988-05-28
EP0267405A3 (de) 1990-01-10
ES2002603A4 (es) 1988-09-01
DE267405T1 (de) 1988-10-13

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RIN1 Information on inventor provided before grant (corrected)

Inventor name: IMAKIIRE, KOICHIRONAGASAKI SHIPYARD&ENGINE WORKS

Inventor name: MATSUDAIRA, NOBUYASUSAGAMIHARA MACHINERY WORKS

Inventor name: MATSUO, EITOC/O NAGASAKI TECHNICAL INSTITUTE