EP0695854A1 - Rotor for pneumatic motor - Google Patents

Rotor for pneumatic motor Download PDF

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Publication number
EP0695854A1
EP0695854A1 EP95202027A EP95202027A EP0695854A1 EP 0695854 A1 EP0695854 A1 EP 0695854A1 EP 95202027 A EP95202027 A EP 95202027A EP 95202027 A EP95202027 A EP 95202027A EP 0695854 A1 EP0695854 A1 EP 0695854A1
Authority
EP
European Patent Office
Prior art keywords
rotor
notches
cylindrical body
stator cavity
blades
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Withdrawn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
EP95202027A
Other languages
German (de)
English (en)
French (fr)
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 EP0695854A1 publication Critical patent/EP0695854A1/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Withdrawn legal-status Critical Current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
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0818—Vane tracking; control therefor
    • F01C21/0854—Vane tracking; control therefor by fluid means
    • F01C21/0863—Vane tracking; control therefor by fluid means the fluid being the working fluid

Definitions

  • the present invention relates to a rotor 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.
  • 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 up to a diametrically opposed point of maximum eccentricity, and a decreasing section from the point of maximum eccentricity to the point of contact.
  • 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 length with increasing section 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 length with decreasing section of said interspace, between the point of maximum eccentricity and said point of contact.
  • 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 have to project from the cylindrical body of the rotor to an extent which varies according to the section of said interspace: at the point of contact between the cylindrical body of the rotor and stator cavity, the blades are fully withdrawn into the housing notches; on moving in the direction of rotation of the rotor, the blades project to an increasing extent until they reach maximum extension at the point of maximum eccentricity.
  • pneumatic motors are known in which the pressurised fluid itself is used to press the radial blades against the internal surface of the stator cavity. This is obtained for example by means of a plurality of radial grooves formed in the two closure covers of the open ends of the stator cavity, which grooves, when the housing notches of the blades transit in front thereof, allow the pressurised fluid to penetrate the notches themselves so as to push the blades radially towards the outside.
  • both the previous solutions are disadvantageous from the point of view of production in that they require machining not only of the rotor (to make the houses of the blades), but also of the covers or of the blades themselves, in order to form the aforementioned grooves for passage of the pressurised fluid.
  • the object of the present invention is that of providing a rotor for a pneumatic motor which overcomes the disadvantages of known rotors.
  • a rotor for pneumatic motor comprising a stator cavity wherein the rotor is rotatably inserted, said rotor comprising a substantially cylindrical body wherein a circumferential series of radial notches is formed, extending along the whole length of the cylindrical body itself, and forming the same number of seats for respective radial blades slidingly inserted in said notches, characterised in that each of said notches is related to at least one respective conduit formed in said cylindrical body separately and further forward in relation to said notch in the direction of rotation of the rotor and leading into the stator cavity and the base of the respective notch, to allow a pressurised fluid to penetrate the base of said notches in order to force said blades into a condition of forced engagement with an internal surface of said stator cavity.
  • the blade when, during its motion of turning around the axis of rotation of the rotor, the blade transits at the point of contact between the cylindrical body of the rotor and stator cavity, it may already receive the thrust of the pressurised fluid penetrating the base of the housing notch through the conduit placed further forward, which is already in the length with increasing section of the interspace of the stator cavity. In this way, when the blade enters the length with increasing section of the interspace, it is already effectively pushed against the internal surface of the stator cavity by the pressurised fluid.
  • Another advantage consists of the fact that it is no longer necessary to machine the blades or other parts of the pneumatic motor other than the cylindrical body of the rotor, which has in any case to be machined to make the seats of the radial blades.
  • the rotor according to the present invention simplifies the process of manufacture of the pneumatic motor, at the same time guaranteeing the same functional characteristics of known pneumatic motors.
  • 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, having ovalisations or convexings 10 (indicated by the displacement of the profile of the stator cavity in relation to an ideal cylindrical profile which can be seen as a dotted and dashed line in Figure 1) as described in a contemporary patent application for industrial invention in the name of the same applicant.
  • 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.
  • 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 contact 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 contact 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, having a substantially "L" shape, and which start from the external surface of the cylindrical body 7, extend 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 respective radial notch 8 in the direction of rotation of the rotor inside the stator cavity 2.
  • 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.
  • the grooves 11 are further forward in relation to the respective radial notch 8 whereto they are related in the direction of rotation of the rotor inside the stator cavity 2, when a blade 9 is positioned at the point of minimum eccentricity 50, the grooves 11 are already in the length with increasing section of the interspace 51, and the compressed air can therefore penetrate through them into the base of the notch 8.
  • the blade 9 is thus pushed beforehand against the internal surface of the stator cavity 2, and when, after having passed beyond the point 50, it enters the length with increasing section of the interspace 51, tightness is guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Actuator (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
EP95202027A 1994-07-29 1995-07-22 Rotor for pneumatic motor Withdrawn EP0695854A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI941638A IT1273703B (it) 1994-07-29 1994-07-29 Rotore per motore pneumtico
ITMI941638 1994-07-29

Publications (1)

Publication Number Publication Date
EP0695854A1 true EP0695854A1 (en) 1996-02-07

Family

ID=11369400

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95202027A Withdrawn EP0695854A1 (en) 1994-07-29 1995-07-22 Rotor for pneumatic motor

Country Status (3)

Country Link
EP (1) EP0695854A1 (pt)
IT (1) IT1273703B (pt)
TW (1) TW269756B (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3508725A1 (en) * 2018-01-08 2019-07-10 LG Electronics Inc. Backpressure passage rotary compressor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR590085A (fr) * 1924-12-08 1925-06-10 Procédé d'équilibrage des efforts, dûs à la pression interne, agissant à l'extrémité des palettes d'étanchéité des machines rotatives
FR1078008A (fr) * 1953-06-03 1954-11-15 Pompe centrifuge à palettes hydrauliquement commandées
FR2095507A5 (pt) * 1970-06-20 1972-02-11 Pierburg Kg A
US3869231A (en) * 1973-10-03 1975-03-04 Abex Corp Vane type fluid energy translating device
FR2467970A1 (fr) * 1979-10-17 1981-04-30 Ushio Kogyo Co Moteur a fluide sous pression actionnant un rotor a palettes
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR590085A (fr) * 1924-12-08 1925-06-10 Procédé d'équilibrage des efforts, dûs à la pression interne, agissant à l'extrémité des palettes d'étanchéité des machines rotatives
FR1078008A (fr) * 1953-06-03 1954-11-15 Pompe centrifuge à palettes hydrauliquement commandées
FR2095507A5 (pt) * 1970-06-20 1972-02-11 Pierburg Kg A
US3869231A (en) * 1973-10-03 1975-03-04 Abex Corp Vane type fluid energy translating device
GB1605285A (en) * 1978-01-30 1988-02-03 Secr Defence Hydraulic vane machines
FR2467970A1 (fr) * 1979-10-17 1981-04-30 Ushio Kogyo Co Moteur a fluide sous pression actionnant un rotor a palettes
JPS58117382A (ja) * 1981-12-29 1983-07-12 Matsushita Electric Ind Co Ltd ロ−タリ−圧縮機

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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3508725A1 (en) * 2018-01-08 2019-07-10 LG Electronics Inc. Backpressure passage rotary compressor
US11346221B2 (en) 2018-01-08 2022-05-31 Lg Electronics Inc. Backpressure passage rotary compressor

Also Published As

Publication number Publication date
TW269756B (pt) 1996-02-01
IT1273703B (it) 1997-07-09
ITMI941638A1 (it) 1996-01-29
ITMI941638A0 (it) 1994-07-29

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