EP0057776A2 - Appareil pouvant être traversé par un fluide en contre-pression - Google Patents

Appareil pouvant être traversé par un fluide en contre-pression Download PDF

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Publication number
EP0057776A2
EP0057776A2 EP81201136A EP81201136A EP0057776A2 EP 0057776 A2 EP0057776 A2 EP 0057776A2 EP 81201136 A EP81201136 A EP 81201136A EP 81201136 A EP81201136 A EP 81201136A EP 0057776 A2 EP0057776 A2 EP 0057776A2
Authority
EP
European Patent Office
Prior art keywords
rotor
rotors
profilings
male
fluid
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Withdrawn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
EP81201136A
Other languages
German (de)
English (en)
Other versions
EP0057776A3 (fr
Inventor
Berend Jan Bloemendal
Marinus Johannes Grootte Bromhaar
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.)
Delta Screw Nederland BV
Original Assignee
Delta Screw Nederland BV
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
Priority claimed from NL8100497A external-priority patent/NL8100497A/nl
Priority claimed from NL8101575A external-priority patent/NL8101575A/nl
Priority claimed from NL8103642A external-priority patent/NL8103642A/nl
Application filed by Delta Screw Nederland BV filed Critical Delta Screw Nederland BV
Publication of EP0057776A2 publication Critical patent/EP0057776A2/fr
Publication of EP0057776A3 publication Critical patent/EP0057776A3/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Withdrawn legal-status Critical Current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
    • F01C1/08—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
    • F01C1/14—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 toothed rotary pistons
    • F01C1/16—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 toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type

Definitions

  • the invention relates to an apparatus through which a fluid can flow under counter-pressure, comprising at least two elongate rotors arranged within the apparatus for rotation about their longitudinal axes, the external shape of said rotors being bounded by a curved side face and flat end faces, the curved side faces of the two rotors being provided with enmeshing profilings of mutually complementary shape so that one rotor can be called a male rotor and the other a female rotor, respectively of a shape allowing the transmission of the rotary movement of one of the rotors to the other rotor; a housing composed of hollow, cross-sectionally partially overlapping cylinders each containing one rotor, with the inner wall of which housing the corresponding rotors are in sealing contact with respect to the fluid through the intermediary of the associated profilings, the ends of the housing being shut off by covers, there being provided in or adjacent one of the covers means for the supply of the fluid and in or adjacent the other cover means for the discharge of the fluid.
  • Such an. apparatus is generally known, e.g. in the form of the so-called screw-type compressors.
  • These known screw-type compressors are available in practice only in sizes with a power of over 7.5 HP (5.5 kW). The reason is the inadmissibly decreasing efficiency going with smaller sizes on account of the internal leakage occurring in such screw-type compressors of the air from the high-pressure space to the low-pressure space, in particular via the blowhole, which is produced between the grooves of the profilings of the male and the female rotor in the overlapping area of the two cylindrical spaces accommodating the respective rotors.
  • the apparatus is provided to this effect with rotors with an altered profiling, the apparatus being characterized in that the side face of the male rotor is formed from a portion of one or more helical profilings and the side face of the female rotor from one or more channel-shaped profilings, the profilings of the male rotor and of the female rotor being of such a shape that, as the two rotors are rolling on each other, in the overlapping area defined by the two points of intersection of the circular cross-sections of the cylinders, the bottan and walls of the channel-shaped profiling of the female rotor are in contact with crests forming part of the profiling of the male rotor, with formation of a linear seal.
  • the chambers formed through coaction of the two rotors with the walls of each of their associated cylinders, upon in-rotation in the overlapping area, are first always canbined to one closedspace of low, e.g. atmospheric pressure, which space is closed during the entire compression stage, functioning as one compression chamber, which is reduced in size during the compression stage.
  • the invention in this respect is in contrast to the principle used in the prior art screw-type canpressors, which have two separate adjacently disposed chambers whereby the fluid in the one chamber, e.g. air, has already been compressed and has a high pressure, while in the other chamber the air has to be compressed yet, so having a low, e.g.
  • a particular embodiment of the profilings of the male and female rotor is that wherein the linear seal is a rectilinear seal.
  • the linear seal is a rectilinear seal.
  • the profiling of the side face of the female rotor according to the invention is not spiral-shaped, as is the case in general with the prior art screw-type compressors, but channel-shaped and may contain a plurality of such channel-shaped grooves, in which the helical profilings of the male rotor come to perform a rolling movement.
  • the female rotor is often manufactured by means of a milling, whereby during the milling the workpiece can be rotated, whether or not uniformly, and a certain torsion is imparted to the channel-shaped grooves.
  • manufacture of a lathe is also possible.
  • the male and female rotors can be advantageously applied in an apparatus according to the invention that takes the form of a screw-type compressor.
  • an apparatus according to the invention that takes the form of a screw-type compressor.
  • the operation of the screw-type compressor apparatus according to the invention is analogous to that of the prior art screw-type canpressors; the grooves of the two rotors rolling on each other are filled with the gas to be compressed at the moment when these rotate along the open gas inlet port. Since the profilings of the two rotors enmesh, the volumes of the gas-filled grooves become alternately smaller and larger. At the location where the grooves have the smallest volume, there is provided the gas outlet port or valve where the compressed gas can be discharged.
  • the required shape of the profiling of the two rotors according to the invention can also be determined by means of a computer on the- basis of the theory of kinematics and the equations to be used and known per se therefrom, which provide the displacement of a point, said displacement having to comply with pre-set conditions, as a function of the time and the result being recorded on a punched tape in the form of coordinates required for the profile shape, with which in its turn a computer-controlled processor can be fed.
  • the apparatus according to the invention can also advantageously be designed as an engine, in particular a combustion engine, which can then be considered as an engine of the rotary cylinder type, wherein the housing, within which the rotors rotate in corresponding, overlapping cylindrical spaces, is provided at the ends thereof with a front and a back cover with a suction port or valve for the fuel mixture adjacent or in the one cover and an outlet port or valve for the waste gases adjacent or in the other cover.
  • a combustion engine which can then be considered as an engine of the rotary cylinder type, wherein the housing, within which the rotors rotate in corresponding, overlapping cylindrical spaces, is provided at the ends thereof with a front and a back cover with a suction port or valve for the fuel mixture adjacent or in the one cover and an outlet port or valve for the waste gases adjacent or in the other cover.
  • Rotary combustion engines are known per se in the form of the so-called Wankel engine.
  • a delta-shaped rotor is rotated non-centrically about a gear in a cylinder.
  • This prior art. engine is notorious for its sealing problems of the delta-shaped rotor non-centrically rotating in the cylinder, owing to which it requires machining to very close tolerances, so that manufacture requires great accuracy and is hence time-consuming and expensive.
  • the ridges of the profilings of the rotors according to the invention may be designed in such a way that they have the shape of an elongate face of a given width, the possibility is offered to recess in said ridges a sealing strip (piston ring). As a result of the centrifugal forces acting on the strip, this is pressed against the cylinder wall or the other rotor.
  • the apparatus according to the invention designed as screw motor may further be designed in such a way as to comprise means for driving same by means of a gas under high pressure or by means of combustion gases, originating from a combustion to be realised outside the apparatus.
  • Fig. 1 a known assembly of a male rotor 2 and a female rotor 3.
  • the drive takes place via the shaft 4 of the male rotor,while through the enmeshing profilings of the two rotors, the drive of the male rotor 2 causes the female rotor 3 to be carried along in opposite rotary movement as indicated in Fig. 2 by arrows R, the male rotor 2 and the female rotor 3 being arranged within their cylindrical spaces 7, 8 which, seen in cross-section, partially overlap each other in the area indicated by the points of intersection 5 and 6 of the circular cross-sections of the spaces 7 and 8.
  • the pressure in the space 10 formed by the male rotor in co-action with the cylindrical house 7 is higher than in the space 11 between female rotor anf the associated housing 8 on account of the reduction in volume occurring in space 10 as a result of the profile 9, tooth-shaped in section, entering said space.
  • the pressure in space 11 in the position shown in Fig. 2 of the rotors is equal to that in the spaces 32, 33, 34, 35, 36 and 37 and substantailly equal to atmospheric pressurel, Furthermore Fig.
  • the assembly according to the invention shown in Fi g. 3, which is suitable for use in an oil-free compressor comprises a male rotor 12 and a female rotor 13.
  • the male motor 12 is provided with three helical profilings, while in the ridges thereof there is provided a strip fran a self-lubricating material, as indicated by way of example for strip 14.
  • the female motot13 is provided with six channel-shaped grooves which are sligintly twisted, while here too, the ridges of the grooves contain a strip of a self-lubricating material; as indicated by way of example for strip 15.
  • Fig. 4 shows the male rotor 12 and the associated female rotor 13 provided in their cylindrical spaces 16 and 17 forming part of the housing of the screw-type compressor, which spaces overlap each other partially to a cross-sectionally overlapping area located between the points of intersecion 20 and 21.
  • Fig. 4 a shows the situation wherein the crest 18 of the profiling just releases contact with the wall of the cylindrical housing 16 and rotates into the overlapping area at point of intersection 20. At that moment the sealing, as a result cf the contact of the crest 18 with the wall of the cylindrical space 16, is taken over by the contact of the crest 18 with the inside of the portion 19 of the profiling of the female rotor, which portion is tooth shaped in section.
  • the pressures in the spaces 40 and 41 formed through co-action of the male rotor 12 and the cylindrical housing 16 and the spaces 42, 43, 44 and 45 formed through co-action of the female rotor 13 and the cylindrical housing 17, as well as the combined space 46 are all equal and substantially equal to atmospheric pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)
EP81201136A 1981-02-02 1981-10-12 Appareil pouvant être traversé par un fluide en contre-pression Withdrawn EP0057776A3 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
NL8100497 1981-02-02
NL8100497A NL8100497A (nl) 1981-02-02 1981-02-02 Schroefcompressor met a-symmetrische schroeflijnspoed.
NL8101575A NL8101575A (nl) 1981-03-30 1981-03-30 Schroefcompressor met continu afdichtingskanten.
NL8101575 1981-03-30
NL8103642 1981-07-31
NL8103642A NL8103642A (nl) 1981-07-31 1981-07-31 Schroefmotor.

Publications (2)

Publication Number Publication Date
EP0057776A2 true EP0057776A2 (fr) 1982-08-18
EP0057776A3 EP0057776A3 (fr) 1982-09-22

Family

ID=27352075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81201136A Withdrawn EP0057776A3 (fr) 1981-02-02 1981-10-12 Appareil pouvant être traversé par un fluide en contre-pression

Country Status (1)

Country Link
EP (1) EP0057776A3 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1991541A (en) * 1933-09-19 1935-02-19 Cannizzaro Joseph Combined velocity and displacement pump or compressor
US2243874A (en) * 1934-10-16 1941-06-03 Milo Ab Rotary compressor
FR953057A (fr) * 1946-07-18 1949-11-30 Ljungstroms Angturbin Ab Perfectionnements aux compresseurs et aux moteurs à roue hélicoïdale
FR967547A (fr) * 1947-06-13 1950-11-06 Wright Aeronautical Corp Perfectionnements aux machines à variation de pression, telles que compresseurs ou moteurs actionnés par la pression ou relatifs à ces machines
US3386245A (en) * 1965-05-07 1968-06-04 Russell W. Gamage Rotary external combustion engines
DE2004755A1 (de) * 1969-01-29 1970-09-03 Plenty & Son Ltd., Newbury, Berk·. shire (Großbritannien) Verfahren zum Herstellen eines Rotors
FR2259986A1 (fr) * 1974-02-01 1975-08-29 Svenska Rotor Maskiner Ab

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1991541A (en) * 1933-09-19 1935-02-19 Cannizzaro Joseph Combined velocity and displacement pump or compressor
US2243874A (en) * 1934-10-16 1941-06-03 Milo Ab Rotary compressor
FR953057A (fr) * 1946-07-18 1949-11-30 Ljungstroms Angturbin Ab Perfectionnements aux compresseurs et aux moteurs à roue hélicoïdale
FR967547A (fr) * 1947-06-13 1950-11-06 Wright Aeronautical Corp Perfectionnements aux machines à variation de pression, telles que compresseurs ou moteurs actionnés par la pression ou relatifs à ces machines
US3386245A (en) * 1965-05-07 1968-06-04 Russell W. Gamage Rotary external combustion engines
DE2004755A1 (de) * 1969-01-29 1970-09-03 Plenty & Son Ltd., Newbury, Berk·. shire (Großbritannien) Verfahren zum Herstellen eines Rotors
FR2259986A1 (fr) * 1974-02-01 1975-08-29 Svenska Rotor Maskiner Ab

Also Published As

Publication number Publication date
EP0057776A3 (fr) 1982-09-22

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Inventor name: GROOTTE BROMHAAR, MARINUS JOHANNES

Inventor name: BLOEMENDAL, BEREND JAN