EP0695855A1 - Corps de moteur pneumatique - Google Patents

Corps de moteur pneumatique Download PDF

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Publication number
EP0695855A1
EP0695855A1 EP95202028A EP95202028A EP0695855A1 EP 0695855 A1 EP0695855 A1 EP 0695855A1 EP 95202028 A EP95202028 A EP 95202028A EP 95202028 A EP95202028 A EP 95202028A EP 0695855 A1 EP0695855 A1 EP 0695855A1
Authority
EP
European Patent Office
Prior art keywords
stator
interspace
length
point
stator cavity
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Withdrawn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
EP95202028A
Other languages
German (de)
English (en)
Inventor
Guido Valentini
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0695855A1 publication Critical patent/EP0695855A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/106—Stators; Members defining the outer boundaries of the working chamber with a radial surface, e.g. cam rings

Definitions

  • the present invention relates to a stator for pneumatic motor.
  • Pneumatic motors comprise a fixed body or stator inside whereof a cylindrical cavity, known as the stator cavity, is formed, wherein a rotor is rotatably inserted, comprising a cylindrical body of smaller diameter, integral with a motion transmission shaft.
  • the rotor is provided with a circumferential series of radial blades extending along the whole length of the cylindrical body of the rotor itself.
  • the longitudinal axis of the cylindrical body of the rotor (coinciding with the axis of rotation of the shaft) is parallel but misaligned in relation to the longitudinal axis of the stator cavity for a length sufficient for the cylindrical body of the rotor and the stator cavity to have a point of contact, and in the stator cavity an interspace is formed with an increasing section from said point of contact (or point of minimum eccentricity) up to a diametrically opposed point of maximum eccentricity, and then decreasing from the point of maximum eccentricity to the point of minimum eccentricity.
  • the stator cavity is also provided with an inlet passage for a pressurised aeriform fluid (typically air) which leads into the stator cavity itself in the increasing section length of said interspace, near the point of contact with the cylindrical body of the rotor, and a passage for discharge of said aeriform fluid, which leads into the stator cavity in the decreasing section length of said interspace, between the point of maximum eccentricity and the point of minimum eccentricity.
  • aeriform fluid typically air
  • the pressurised fluid entering the stator cavity through the inlet passage exerts a thrust action on the radial blades, causing rotation of the rotor and hence of the transmission shaft, and leaves the stator cavity through the outlet passage.
  • the radial blades are substantially laminae slidingly inserted in respective radial seats formed by housing notches made in the cylindrical body of the rotor and which extend longitudinally along the whole length of the latter. Means are also provided for maintaining the blades in conditions of forced engagement with the internal surface of the stator cavity: the blades therefore project from the cylindrical body of the rotor to an extent which varies according to the section of said interspace.
  • the object of the present invention is that of providing a stator for a pneumatic motor which overcomes the above mentioned disadvantage.
  • the section of said interspace near the inlet of the pressurised fluid is increased in relation to the case of a perfectly cylindrical stator cavity.
  • the active surface of the blades of the rotor is thus increased and as a result the efficiency of the pneumatic rotor increases.
  • stator cavity also comprises a second ovalisation in the length with decreasing section of said interspace, to maintain the section of said interspace constant in a length between the point of maximum eccentricity and a mouth of the outlet passage of the pressurised fluid.
  • a pneumatic motor comprises in a manner in itself known a stator 1 formed substantially by a cylindrical body, wherein a stator cavity 2 with a substantially cylindrical shape is formed.
  • Two passages 3 and 4 are also provided in the stator 1, for inflow into the stator cavity 2 and for discharge respectively from the same of a pressurised aeriform fluid, typically compressed air.
  • the two passages lead into the stator cavity 2 in separate points along a longitudinal axis (perpendicular to the plane of the drawing) of the stator cavity 2 itself.
  • the stator cavity is closed at the two ends by two respective sealed covers 12 (one of which can be seen in Figure 2).
  • a rotor 5 is rotatably inserted, comprising a cylindrical body 7 integral with a motion transmission shaft 6, which is coupled to the rotor 5 by means of a cogged coupling.
  • the longitudinal axis of the rotor 5, coinciding with its axis of rotation, is parallel but misaligned in relation to the longitudinal axis of the stator cavity 2.
  • the misalignment is such that the cylindrical body 7 and the stator cavity 2 have a common point of contact 50, or point of minimum eccentricity.
  • an interspace 51 is formed between the wall of the stator cavity 2 and the external surface of the cylindrical body 7, the interspace having a length with increasing section between the point of minimum eccentricity 50 and a point of maximum eccentricity 52, diametrically opposed, and a length with decreasing section between the point of maximum eccentricity 52 and the point of minimum eccentricity 50.
  • a circumferential series of radial notches 8 is also formed and which extend along the entire length of the cylindrical body 7 (Fig. 2), and in each of which a respective radial blade 9 is slidingly housed.
  • two grooves 11 are provided, formed on the two opposite head faces of the cylindrical body 7, which have a substantially "L" shape and which start from the external surface of the cylindrical body 7, extending radially towards the axis of the cylindrical body 7 (Fig. 4), and bend in an "L" shape to end on the base of the respective notch 8 (Figs. 1 and 2).
  • the grooves 11 are further forward in relation to the radial notches 8 in the direction of rotation of the rotor 5.
  • the ovalisation 20 then decreases gradually until the profile of the stator cavity 2 joins up again with the cylindrical profile 21, in a point 24 placed between the downstream edge 23 of the inlet passage 3 and the point of maximum eccentricity 52.
  • the section of the interspace 51 at the inlet passage 3 for compressed air and in the immediately subsequent section is greater than if the stator cavity 2 were perfectly cylindrical. This causes an increase in the active surface of the blades 9 at the inlet passage 3 for compressed air, where the pressure of the air is greater, and hence better efficiency of the motor.
  • the stator cavity 2 also has a second ovalisation 25 which allows the section of the interspace 51 to be maintained substantially constant in the length from the point of maximum eccentricity 52 to the upstream edge 26 of the air outlet 4, placed at an angle of 60° in relation to the point of maximum eccentricity 52.
  • the section of the interspace 51 is prevented from starting to decrease from the point of maximum eccentricity 52, as in the case of a perfectly cylindrical cavity, causing a reduction in the available volume of air and hence a gradual compression of the latter in an area wherein it is however appropriate for the air to expand as freely as possible to then be discharged.
  • the increase in pressure in the length of the interspace 51 between the point 52 and the outlet 4 slows down the motion of the rotor 5, causing a loss of power.
  • the ovalisation 25 decreases gradually until the profile of the stator chamber 2 joins up again with the cylindrical profile 21, approximately near the downstream edge 27 of the outlet 4.
  • the compressed air entering the stator cavity through the inlet passage 3 disperses clockwise and exerts a thrust action on the blades 9, causing rotation of the rotor 5.
  • the compressed air in the stator cavity 2 moreover, passing through the grooves 11, penetrates the base of the notches 8, thus causing the centrifugal radial thrust of the blades 9, which are in this way maintained in a condition of forced engagement with the internal surface of the stator cavity 2.
EP95202028A 1994-07-29 1995-07-22 Corps de moteur pneumatique Withdrawn EP0695855A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI941639A IT1273704B (it) 1994-07-29 1994-07-29 Statore per motore pneumatico
ITMI941639 1994-07-29

Publications (1)

Publication Number Publication Date
EP0695855A1 true EP0695855A1 (fr) 1996-02-07

Family

ID=11369401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95202028A Withdrawn EP0695855A1 (fr) 1994-07-29 1995-07-22 Corps de moteur pneumatique

Country Status (3)

Country Link
EP (1) EP0695855A1 (fr)
IT (1) IT1273704B (fr)
TW (1) TW272332B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018033070A1 (fr) * 2016-08-19 2018-02-22 唐翊翃 Appareil de conversion de puissance de fluide et procédé de conversion de puissance de fluide

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2347944A (en) * 1942-05-22 1944-05-02 Fowler Elbert Rotary pump
US3452725A (en) * 1967-08-23 1969-07-01 Donald A Kelly High compression rotary i.c. engine
US3499600A (en) * 1968-03-21 1970-03-10 Whirlpool Co Rotary compressor
FR2095507A5 (fr) * 1970-06-20 1972-02-11 Pierburg Kg A
JPS58117382A (ja) * 1981-12-29 1983-07-12 Matsushita Electric Ind Co Ltd ロ−タリ−圧縮機
GB1605285A (en) * 1978-01-30 1988-02-03 Secr Defence Hydraulic vane machines
US5310326A (en) * 1992-09-14 1994-05-10 Mainstream Engineering Corporation Rotary compressor with improved bore configuration and lubrication system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2347944A (en) * 1942-05-22 1944-05-02 Fowler Elbert Rotary pump
US3452725A (en) * 1967-08-23 1969-07-01 Donald A Kelly High compression rotary i.c. engine
US3499600A (en) * 1968-03-21 1970-03-10 Whirlpool Co Rotary compressor
FR2095507A5 (fr) * 1970-06-20 1972-02-11 Pierburg Kg A
GB1605285A (en) * 1978-01-30 1988-02-03 Secr Defence Hydraulic vane machines
JPS58117382A (ja) * 1981-12-29 1983-07-12 Matsushita Electric Ind Co Ltd ロ−タリ−圧縮機
US5310326A (en) * 1992-09-14 1994-05-10 Mainstream Engineering Corporation Rotary compressor with improved bore configuration and lubrication system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 223 (M - 247)<1368> 4 October 1983 (1983-10-04) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018033070A1 (fr) * 2016-08-19 2018-02-22 唐翊翃 Appareil de conversion de puissance de fluide et procédé de conversion de puissance de fluide

Also Published As

Publication number Publication date
ITMI941639A0 (it) 1994-07-29
TW272332B (fr) 1996-03-11
IT1273704B (it) 1997-07-09
ITMI941639A1 (it) 1996-01-29

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