US3726617A - Pump or a motor employing a couple of rotors in the shape of cylinders with an approximately cyclic section - Google Patents

Pump or a motor employing a couple of rotors in the shape of cylinders with an approximately cyclic section Download PDF

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Publication number
US3726617A
US3726617A US00132776A US3726617DA US3726617A US 3726617 A US3726617 A US 3726617A US 00132776 A US00132776 A US 00132776A US 3726617D A US3726617D A US 3726617DA US 3726617 A US3726617 A US 3726617A
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Prior art keywords
rotor
rotors
center
pump
equal
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Expired - Lifetime
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US00132776A
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English (en)
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T Daido
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Individual
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    • 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
    • F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
    • F01C1/126—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with elements extending radially from the rotor body not necessarily cooperating with corresponding recesses in the other rotor, e.g. lobes, Roots type

Definitions

  • FIGS. 1 to 4 are illustrations of this invention.
  • FIGS. 5 and 6 are to show the modification of the rotors.
  • Numeral 1 denotes the section of the inner circumference of the casing, the distance between the centers and 0 being 0,0 2 (R-e), consisting of two circular arcs of two circles 1a and lb with equal radius R excepting those included between A and B which are crossing points.
  • Numerals 2 and 3 are two rotors each with eccentricity or e of eccentric radius e as its center and with cylindrical circumference of radius r R e.
  • the eccentricities e and e are on the straight line 0 -0 and its extension
  • the rotor 2 touches the circle 1b with the center 0 at the point C
  • the rotor 3 touches the circle 1a with the center 0- at the middle point D of the imaginary circular are between A and B corresponding with the cut-off portion.
  • the rotors 2 and 3 naturally touches each other externally at D.
  • Numerals 4 and 5 denote an inlet or an outlet port of working fluid and their crossing points as shown in the figure of the inner circumferences 1a and 1b of the casing are denoted by G, H, K and L.
  • the eccentric radius e and the eccentricity e/R being chosen sufficiently small, the circular are between G and H, which are the crossing points of the inlet or the outlet port of the working fluid shown in FIG. 1 and the inner circumference 1a of the casing, within the limits of the angle 0 involved at the center 0 is considered approximately equal to the circular arc of the rotor with the center e within this angle 0 and that the angle 0 is a small one at least less that 90. If the rotors 2 and 3 respectively with O and O, as their center are made to revolve at a uniform speed in the directions of the arrows in opposi-' tions to each other, when they revolve 90 from the above and reach the positions shown in FIG.
  • FIGS. 2 to 4 are ones in which the states of contact of the rotors 2 and 3 in their revolving positions are examined in drawings: FIG. 2 showing when the rotors 2 and 3 are turned half of the angle degrees 0 as far as radius O,D and 0,6 come together, FIG. 3 when the rotors 2 and 3 turn 90 from the positions shown in FIG. 1, and FIG. 4 when the rotors 2 and 3 turn as far as the radius 0 C and 0 K come together.
  • FIGS. 5 and 6 are to illustrate how to modify the circumferences of the rotors 2 and 3 in other to keep them constantly in tough with each other.
  • C and D There is a small gap between C and D (1 when this gap is assumed to be 28, the length 8 is added to each end of the chords C -C and D D, thus forming N,N and N -N as shown in the figure.
  • N, and N assumed to be the modified points of the rotor 2 and N and N to be those of the rotor 3 both rotors 2 and 3 constantly externally touch each other at the point N.
  • N and N assumed to be the modified points of the rotor 2 and N and N to be those of the rotor 3
  • the rotors 2 and 3 can be made to rotate with the centers 0 and 0 of the casings as their centers of rota- Il-O1Il all running through the point 0, to take up the points on either side a length r distant from M's which are points of intersection where these straight lines cross the circumference of the circle m.
  • M is identical with 0 in the case of I-O -I and in case of IV-O IV running on the line e and 0 e is identical with M).
  • the point of the modified circle is represented by
  • One of the characteristics of the present invention is that to iessen the pulsating flow of the working fluid, more than one sets of rotor and casing having the same rotor shaft in common but 90 different in position from each other are arranged, in which the inlet or the outlet ports 4 and 5 are joined in series so as to drive the rotors with a single motive power or contrariwise, to drive a single load by means of more than one sets of rotors.
  • Another merit of this invention is that compared with the pumps of other types eg the plunger pumps or the screw pumps, this invention is remarkably simple in structure and can be provided cheaply. It is another merit of this invention that regardless of the number of rotation, the pump or the motor can produce high pressure, making no noises.
  • a pump or motor having (a) a pair of chambers the inner surface of which corresponds to the nonover-' lapping surfaces of two parallel and equal intersecting cylinders, (b) an inlet port and an outlet port on the two lines of intersection of said chambers, and (c) a rotor mounted in each chamber for eccentric rotation therein about the longitudinal centerline of said chamber, the improvement comprising a rotor of modified circular cross-section and otherwise cylindrical shape, the outer surface of said rotor in cross-section being defined by the loci of points having coordinates on an x-axis equal to cos 8 (r i arms 0) and on the y-axis equal to sin 0 (r i e'cos 0) where:
  • r is equal to Re
  • R is the radius of the cylindrical chamber
  • e is the distance from the center of the rotor to the center of the rotors eccentric rotation
  • 0 is the angle measured at the center of eccentric rotation of any given point on the surface of the rotor above the line intersecting the center of the rotor and the center of eccentric rotation;
  • said x-axis corresponding to a line perpendicularly intersecting the two longitudinal centerlines of the cylindrical chambenand said y-axis corresponding to a line perpendicularly intersecting both said x-axis and the centerline of said cylindrical chamber in which the rotor is disposed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
US00132776A 1970-04-17 1971-04-09 Pump or a motor employing a couple of rotors in the shape of cylinders with an approximately cyclic section Expired - Lifetime US3726617A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45033198A JPS4836361B1 (enrdf_load_stackoverflow) 1970-04-17 1970-04-17

Publications (1)

Publication Number Publication Date
US3726617A true US3726617A (en) 1973-04-10

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Application Number Title Priority Date Filing Date
US00132776A Expired - Lifetime US3726617A (en) 1970-04-17 1971-04-09 Pump or a motor employing a couple of rotors in the shape of cylinders with an approximately cyclic section

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US (1) US3726617A (enrdf_load_stackoverflow)
JP (1) JPS4836361B1 (enrdf_load_stackoverflow)
DE (1) DE2118383A1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3929402A (en) * 1974-12-02 1975-12-30 Emil Georg Schubert Multiple rotary engine
US3936248A (en) * 1973-05-11 1976-02-03 Dornier Gmbh Casing for rotary piston engines of trochoidal construction
US5152683A (en) * 1991-06-27 1992-10-06 Signorelli Richard L Double rotary piston positive displacement pump with variable offset transmission means
AU698998B3 (en) * 1998-05-12 1998-11-19 George A. Subkey Dual revolving piston system
US6250278B1 (en) 1998-06-15 2001-06-26 Dan Mekler Rotary machine
US6604503B2 (en) 1998-06-15 2003-08-12 M.R. Engines Ltd. Rotary machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50131572U (enrdf_load_stackoverflow) * 1974-04-03 1975-10-29
JPS5192669U (enrdf_load_stackoverflow) * 1975-01-24 1976-07-24

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20796A (en) * 1858-07-06 Rotary pump
US1771863A (en) * 1927-06-03 1930-07-29 Patiag Patentverwertungs Und I Rotary pump
US1837714A (en) * 1929-02-13 1931-12-22 Samuel E Dettelbach Rotary pump
DE696469C (de) * 1938-03-06 1940-09-21 Rudolf Truempener Drehkolbenmaschine
US3078807A (en) * 1958-10-16 1963-02-26 William D Hewit Dual-action displacement pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20796A (en) * 1858-07-06 Rotary pump
US1771863A (en) * 1927-06-03 1930-07-29 Patiag Patentverwertungs Und I Rotary pump
US1837714A (en) * 1929-02-13 1931-12-22 Samuel E Dettelbach Rotary pump
DE696469C (de) * 1938-03-06 1940-09-21 Rudolf Truempener Drehkolbenmaschine
US3078807A (en) * 1958-10-16 1963-02-26 William D Hewit Dual-action displacement pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936248A (en) * 1973-05-11 1976-02-03 Dornier Gmbh Casing for rotary piston engines of trochoidal construction
US3929402A (en) * 1974-12-02 1975-12-30 Emil Georg Schubert Multiple rotary engine
US5152683A (en) * 1991-06-27 1992-10-06 Signorelli Richard L Double rotary piston positive displacement pump with variable offset transmission means
AU698998B3 (en) * 1998-05-12 1998-11-19 George A. Subkey Dual revolving piston system
US6250278B1 (en) 1998-06-15 2001-06-26 Dan Mekler Rotary machine
US6604503B2 (en) 1998-06-15 2003-08-12 M.R. Engines Ltd. Rotary machine
US20040182357A1 (en) * 2001-06-25 2004-09-23 Dan Makler Rotary machine
US6945217B2 (en) 2001-06-25 2005-09-20 Dar Engines, Ltd. Rotary machine

Also Published As

Publication number Publication date
JPS4836361B1 (enrdf_load_stackoverflow) 1973-11-05
DE2118383A1 (de) 1971-11-11

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