EP1239115A2 - Vane motor rotor - Google Patents

Vane motor rotor Download PDF

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Publication number
EP1239115A2
EP1239115A2 EP02005031A EP02005031A EP1239115A2 EP 1239115 A2 EP1239115 A2 EP 1239115A2 EP 02005031 A EP02005031 A EP 02005031A EP 02005031 A EP02005031 A EP 02005031A EP 1239115 A2 EP1239115 A2 EP 1239115A2
Authority
EP
European Patent Office
Prior art keywords
rotor
shaft
cavity
wall
drum
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Withdrawn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
EP02005031A
Other languages
German (de)
French (fr)
Other versions
EP1239115A3 (en
Inventor
Mauro Rossi
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.)
Campagnola Srl
Original Assignee
Campagnola Srl
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 Campagnola Srl filed Critical Campagnola Srl
Publication of EP1239115A2 publication Critical patent/EP1239115A2/en
Publication of EP1239115A3 publication Critical patent/EP1239115A3/en
Withdrawn legal-status Critical Current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
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/30—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F01C1/34—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members
    • F01C1/344—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/30—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F01C1/34—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members
    • F01C1/344—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F01C1/3441—Rotary-piston machines or engines having the characteristics covered by two or more groups F01C1/02, F01C1/08, F01C1/22, F01C1/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F01C1/08 or F01C1/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons

Definitions

  • the present invention relates to pneumatic rotary engines.
  • the invention refers to a rotor for pneumatic rotary engine fit for increasing the delivered torque.
  • rotors for turbines or for rotary engines in which the compressed air is fed to chambers by means of one or more inlet ducts.
  • Each chamber is defined by walls of a cylinder of an engine stator and by a couple of blades or vanes which are slidably housed in radial slots of a rotor drum to slide air-tightly over the walls of the cylinder.
  • the axis of rotation of the rotor and the geometric axis of the cylinder are usually parallel and misaligned.
  • the compressed air expands causing the rotation of the rotor in a direction in which the chamber volume increases.
  • the air flows out through one or more exhaust ducts.
  • a further drawback consists in that the known rotors do not increase the power of the engine.
  • the main object of the present invention is to propose a rotor fit for supporting and allowing the engine starting when one or more vanes are held in retracted position by dirt or similar and consequently fit for releasing said vanes.
  • Further object of the present invention is to propose a rotor fit to increase the engine power.
  • numeral 1 indicates the rotor for pneumatic compressed air engine or turbine object of the present invention.
  • the rotor 1 includes a drum 2 and a shaft 3. In an assembling condition, the rotor 1 is housed in a cylinder 12 of a stator 10 of the engine, which rotatably supports the shaft 3. The rotor 1 and the cylinder 12 are parallel and misaligned.
  • the stator 10 includes an inlet duct 9 ending, in correspondence of one of its outlets 8, into the cylinder 12 and includes an air exhaust duct 20.
  • the inlet ducts 9 and the exhaust duct 20 are transversal to the cylinder 12, particularly the inlet duct 9 directs the compressed air flow F approximately in a direction tangent to the drum 2.
  • the rotor includes a plurality of sectors 4 divided by a plurality of seats 5 for vanes 13 for instance flat shaped. These latter slide in the respective seats 5 and, under the action of elastic forces exerted by compressed air or springs, match the wall of the cylinder 12, dividing in chambers the volume included between this latter and the rotor. In consequence of the axial rotation of the drum 2 and because of the eccentricity between drum 2 and cylinder 12, the volume of each chamber increases moving from the outlet 8 to the exhaust duct 20 and decrease moving from this latter to the outlet 8.
  • the drum 2 is in single body with the shaft 3 or is fixed to this latter which has at least an end extending from the stator 10 for the transmission of the motion.
  • each sector 4 is shaped as a cylindrical portion and has a cavity 6.
  • Said cavity 6, for instance carried out by means of a fluted milling cutter axially translated in direction of the drum 2 axis, has a wall 7, shaped as a cylindrical portion that, in a facing condition A in which the cavity 6 faces the outlet 8, is approximately orthogonal to the direction of the compressed air flow F.
  • the shaft 3 can have an axial hole 14.
  • Each sector 4 can have a longitudinal hole 11.
  • drum 2 and/or the shaft 3 are made of alloy iron or alloy aluminium or strengthened synthetic material; for instance the shaft 3 can be made of steel and the drum 2 is made of synthetic resin strengthened with carbon fibres.
  • the operation of the rotor 1 provides that, in a stop condition of the slide of the vanes 13 held in retracted position inside the respective seats 5 by dregs (derived from lubricating thickened), dirty or similar, the flow F hits the cavity 6 and particularly the wall 7 causing a force, orthogonal to said wall and in the same direction of the rotation. Said force contributes to the rotation of the rotor 1, which causes a centrifugal force applied to the vanes 13 which are therefore subject to a radial force, outwardly directed, contributing to release the vanes. Furthermore the effect of the flow F on the walls 7 contributes to the total torque of the rotor 1 at normal operation conditions.
  • each cavity 6 extends parallely to the shaft 4 forming a longitudinal groove 21 which is step-shaped and shown by hatch lines in figure 1.
  • the wall 7 is flat and extends along the whole related sector 4.
  • the groove 21, for instance, can be carried out by removing material longitudinally translating a fluted mill cutter.
  • the main advantage of the present invention is that to provide a rotor fit to allow the starting of the engine and its consequent release due to the action of the centrifugal force of the vanes held in retracted position by dirt and similar.
  • a further advantage is to provide a rotor fit to increase the total torque of the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

A rotor for pneumatic engine includes a shaft (3) having a drum (2) with a plurality of sectors (4) divided by a plurality of seats (5) for vanes (13).
The external portion of each sector (4), has a cavity (6) with a wall (7) that is approximately orthogonal to the direction of a compressed air flow (F), in a facing condition (A), in which the cavity (6) faces an outlet (8) of an inlet duct (9).
The wall (7) is fit to increase the engine torque.

Description

  • The present invention relates to pneumatic rotary engines. Particularly the invention refers to a rotor for pneumatic rotary engine fit for increasing the delivered torque.
  • There are known rotors for turbines or for rotary engines, in which the compressed air is fed to chambers by means of one or more inlet ducts. Each chamber is defined by walls of a cylinder of an engine stator and by a couple of blades or vanes which are slidably housed in radial slots of a rotor drum to slide air-tightly over the walls of the cylinder. In said engines the axis of rotation of the rotor and the geometric axis of the cylinder are usually parallel and misaligned. The compressed air expands causing the rotation of the rotor in a direction in which the chamber volume increases.
  • When the chamber has the maximum volume, the air flows out through one or more exhaust ducts.
  • The main drawback of these known rotors consists in that because of dirt, dregs produced by lubricating or similar, sometimes the blades or vanes do not flow in the relative drum slots but remain in retracted position so blocking the starting and/or the operation of the engine.
  • A further drawback consists in that the known rotors do not increase the power of the engine.
  • The main object of the present invention is to propose a rotor fit for supporting and allowing the engine starting when one or more vanes are held in retracted position by dirt or similar and consequently fit for releasing said vanes.
  • Further object of the present invention is to propose a rotor fit to increase the engine power.
  • The above-mentioned objects are achieved according to the content of the claims.
  • The characteristics of the invention are underlined in the following with particular reference to attached drawings, in which:
    • figure 1 shows a side view of the rotor object of the present invention;
    • figure 2 shows a front view of the rotor of figure 1;
    • figure 3 shows a section view along the line III-III of figure 1 in an assembling condition in a stator of an engine.
  • With reference to the figures 1-3, numeral 1 indicates the rotor for pneumatic compressed air engine or turbine object of the present invention.
  • The rotor 1 includes a drum 2 and a shaft 3. In an assembling condition, the rotor 1 is housed in a cylinder 12 of a stator 10 of the engine, which rotatably supports the shaft 3. The rotor 1 and the cylinder 12 are parallel and misaligned.
  • The stator 10 includes an inlet duct 9 ending, in correspondence of one of its outlets 8, into the cylinder 12 and includes an air exhaust duct 20.
  • The inlet ducts 9 and the exhaust duct 20 are transversal to the cylinder 12, particularly the inlet duct 9 directs the compressed air flow F approximately in a direction tangent to the drum 2.
  • The rotor includes a plurality of sectors 4 divided by a plurality of seats 5 for vanes 13 for instance flat shaped. These latter slide in the respective seats 5 and, under the action of elastic forces exerted by compressed air or springs, match the wall of the cylinder 12, dividing in chambers the volume included between this latter and the rotor. In consequence of the axial rotation of the drum 2 and because of the eccentricity between drum 2 and cylinder 12, the volume of each chamber increases moving from the outlet 8 to the exhaust duct 20 and decrease moving from this latter to the outlet 8.
  • The drum 2 is in single body with the shaft 3 or is fixed to this latter which has at least an end extending from the stator 10 for the transmission of the motion.
  • The external portion of each sector 4 is shaped as a cylindrical portion and has a cavity 6.
  • Said cavity 6, for instance carried out by means of a fluted milling cutter axially translated in direction of the drum 2 axis, has a wall 7, shaped as a cylindrical portion that, in a facing condition A in which the cavity 6 faces the outlet 8, is approximately orthogonal to the direction of the compressed air flow F.
  • The shaft 3 can have an axial hole 14. Each sector 4 can have a longitudinal hole 11.
  • It is provided that the drum 2 and/or the shaft 3 are made of alloy iron or alloy aluminium or strengthened synthetic material; for instance the shaft 3 can be made of steel and the drum 2 is made of synthetic resin strengthened with carbon fibres.
  • The operation of the rotor 1 provides that, in a stop condition of the slide of the vanes 13 held in retracted position inside the respective seats 5 by dregs (derived from lubricating thickened), dirty or similar, the flow F hits the cavity 6 and particularly the wall 7 causing a force, orthogonal to said wall and in the same direction of the rotation. Said force contributes to the rotation of the rotor 1, which causes a centrifugal force applied to the vanes 13 which are therefore subject to a radial force, outwardly directed, contributing to release the vanes. Furthermore the effect of the flow F on the walls 7 contributes to the total torque of the rotor 1 at normal operation conditions.
  • It is provided a variant of the rotor 1 in which each cavity 6 extends parallely to the shaft 4 forming a longitudinal groove 21 which is step-shaped and shown by hatch lines in figure 1. The wall 7 is flat and extends along the whole related sector 4. The groove 21, for instance, can be carried out by removing material longitudinally translating a fluted mill cutter.
  • The main advantage of the present invention is that to provide a rotor fit to allow the starting of the engine and its consequent release due to the action of the centrifugal force of the vanes held in retracted position by dirt and similar. A further advantage is to provide a rotor fit to increase the total torque of the engine.

Claims (7)

  1. Rotor for pneumatic engine including a shaft (3) supported by a stator (10) and having a drum (2) with a plurality of sectors (4) characterized in that the external portion of each sector (4) has at least a cavity (6) fit to engage a feeding flow (F) of the engine.
  2. Rotor according to claim 1 characterized in that said cavity (6) has at least a wall (7), which is approximately orthogonal to the direction of the flow (F), in proximity of an outlet (8) of an inlet duct (9) of the stator (10).
  3. Rotor according to any of the preceding claims characterized in that the wall (7) is shaped as a cylindrical portion.
  4. Rotor according to claim 1 or claim 2 characterized in that each cavity (6) extends parallely to the shaft (3) and the wall (7) is flat.
  5. Rotor according to any of the preceding claims characterized in that the shaft (4) is hollow.
  6. Rotor according to any of the preceding claims characterized in that each sector (4) has at least a longitudinal hole (11).
  7. Rotor according to any of the preceding claims characterized in that the drum (2) and/or the shaft (3) are made of at least one between alloy iron or alloy aluminium and strengthened synthetic material.
EP02005031A 2001-03-06 2002-03-06 Vane motor rotor Withdrawn EP1239115A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO010121 2001-03-06
IT2001BO000121A ITBO20010121A1 (en) 2001-03-06 2001-03-06 ROTOR FOR PNEUMATIC MOTOR

Publications (2)

Publication Number Publication Date
EP1239115A2 true EP1239115A2 (en) 2002-09-11
EP1239115A3 EP1239115A3 (en) 2004-01-02

Family

ID=11439167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02005031A Withdrawn EP1239115A3 (en) 2001-03-06 2002-03-06 Vane motor rotor

Country Status (2)

Country Link
EP (1) EP1239115A3 (en)
IT (1) ITBO20010121A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7306440B2 (en) * 2004-11-05 2007-12-11 Denso Corporation Vane pump including rotor having eccentric gravity center
US7467935B2 (en) * 2004-09-17 2008-12-23 Sauer-Danfoss, Inc. Low input torque rotor for vane pump

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US999753A (en) * 1909-04-10 1911-08-08 Frank J Curtis Rotary pump.
GB442875A (en) * 1933-08-30 1936-02-17 Demag Ag Improvements in rotary piston machines
DE809688C (en) * 1948-10-14 1951-08-02 Jakob Greis Rotary lobe compressors
DE843699C (en) * 1949-12-08 1952-07-10 Dietrich Ringe Automatic seal for rotary piston machines
FR1211370A (en) * 1957-06-03 1960-03-16 Rotol Ltd Improvements to positive displacement pumps and motors of the rotary vane type
US3700363A (en) * 1971-02-04 1972-10-24 Gardner Denver Co Low inertia motor for fluid operated tool
US4822265A (en) * 1986-08-08 1989-04-18 Dover Resources, Inc. Pump rotor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US999753A (en) * 1909-04-10 1911-08-08 Frank J Curtis Rotary pump.
GB442875A (en) * 1933-08-30 1936-02-17 Demag Ag Improvements in rotary piston machines
DE809688C (en) * 1948-10-14 1951-08-02 Jakob Greis Rotary lobe compressors
DE843699C (en) * 1949-12-08 1952-07-10 Dietrich Ringe Automatic seal for rotary piston machines
FR1211370A (en) * 1957-06-03 1960-03-16 Rotol Ltd Improvements to positive displacement pumps and motors of the rotary vane type
US3700363A (en) * 1971-02-04 1972-10-24 Gardner Denver Co Low inertia motor for fluid operated tool
US4822265A (en) * 1986-08-08 1989-04-18 Dover Resources, Inc. Pump rotor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7467935B2 (en) * 2004-09-17 2008-12-23 Sauer-Danfoss, Inc. Low input torque rotor for vane pump
US7306440B2 (en) * 2004-11-05 2007-12-11 Denso Corporation Vane pump including rotor having eccentric gravity center

Also Published As

Publication number Publication date
EP1239115A3 (en) 2004-01-02
ITBO20010121A0 (en) 2001-03-06
ITBO20010121A1 (en) 2002-09-06

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