DE591076C - Rotary lobe pump with slide piston slidably arranged in radial slots of the cylindrical rotor - Google Patents

Rotary lobe pump with slide piston slidably arranged in radial slots of the cylindrical rotor

Info

Publication number
DE591076C
DE591076C DEG83931D DEG0083931D DE591076C DE 591076 C DE591076 C DE 591076C DE G83931 D DEG83931 D DE G83931D DE G0083931 D DEG0083931 D DE G0083931D DE 591076 C DE591076 C DE 591076C
Authority
DE
Germany
Prior art keywords
rotor
radial slots
slidably arranged
lobe pump
cylindrical rotor
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.)
Expired
Application number
DEG83931D
Other languages
German (de)
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
Application granted granted Critical
Publication of DE591076C publication Critical patent/DE591076C/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/02—Liquid sealing for high-vacuum pumps or for compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C2/00—Rotary-piston engines
    • F03C2/30—Rotary-piston engines having the characteristics covered by two or more of groups F03C2/02, F03C2/08, F03C2/22, F03C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3446—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 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 groups F04C2/08 or F04C2/22 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 more than one line or surface

Description

Ihehkolbenpumpe mit in radialen Schlitzen des zylindrischen Rotors gleitbar angeordneten Schieberkolben Die bisher bekannten Drehkolbenpumpen mit Schieberkolben, die .in radialen Schlitzen des Rotors verschiebbar angeordnet sind, haben einen verhältnismäßig großen Rötordurchmesser, weshalb sie für hohe Drehzahlen wenig "geeignet sind; auch können- sie nur bis zu Drucken von etwa q.o Atm. benützt werden. " Erfindungsgemäß wird der Rotor an beiden Seiten mit kegelförmigen Ansätzen ausgestattet, die mittels kegelförmiger Lagerschalen im Gehäuse verkapselt sind und welche die zur Befestigung des Rotors auf der Welle dienenden Keile aufnehmen. Diese Bauart ermöglicht es,. den Rotor mit geringem Durchmesser auszuführen und trotzdem eine erhebliche Zahl von Schaufeln im Rotor zu lagern, weil die Keile zur Befestigung des Rotors nicht mehr an den Stellen des Rotors angebracht zu werden brauchen, an welchen die Führungsschlitze für die Schaufeln vorgesehen sind. Durch die Ansätze wird die Masse des Rotors dicht an die Welle verlegt, wodurch die auftretenden Zentrifugalkräfte gering gehalten werden. Ein weiterer Vorteil liegt darin, daß der Rotor durch die Ansätze gut gegen die feststehenden Teile des Gehäuses abgedichtet werden kann. Das alles hat zur Folge, daß der Rotor bis .etwa zu 2 5 o Atm. Druck beansprucht werden kann.The piston pump with radial slots in the cylindrical rotor slidably arranged slide pistons The previously known rotary lobe pumps with slide pistons, which are arranged displaceably in radial slots of the rotor have a relatively large rotor diameter, which is why they are not very suitable for high speeds are; also can- they only reach pressures of about q.o atm. be used. "According to the invention the rotor is equipped with conical lugs on both sides, which by means of conical bearing shells are encapsulated in the housing and which are used for fastening the rotor on the shaft serving wedges. This design makes it possible. run the rotor with a small diameter and still a significant number of blades to be stored in the rotor because the wedges for fastening the rotor are not need to be attached more to the places on the rotor where the guide slots are provided for the blades. Due to the approaches, the mass of the rotor becomes dense relocated to the shaft, which keeps the centrifugal forces low will. Another advantage is that the rotor works well against the fixed parts of the housing can be sealed. All of this has to The result is that the rotor up to .about 2 5 o atm. Pressure can be claimed.

In der Zeichnung ist ein Ausführungsbeispiel dies -Erfindungsgegenstandes veranschaulicht, und zwar-zeigt Abb. i einen Querschnitt nach der Linie I-1 der Abb. 2, Abb. 2 einen axialen Längsschnitt nach der Linie II-II der Abb. i, Abb.3 den Rotor der Pumpe im Aufriß und in kleinem Maßstabe.The drawing shows an embodiment of this subject matter of the invention Fig. i shows a cross-section along the line I-1 of FIG Fig. 2, Fig. 2 an axial longitudinal section along the line II-II of Fig. I, Fig.3 the rotor of the pump in elevation and on a small scale.

Die dargestellte Pumpe besitzt .ein Gehäuse, bestehend aus einem ringförmigen Gestell q., zwei tellerartigen Lagerschalen 5 und zwei Muttern 6. Die Lagerschalen stützen sich seitlich gegen einen ringförmigen inneren Vorsprung 7 des Gestells q. und sind mittels der Muttern 6 in letzterem befestigt. Zwischen den Lagerschalen 5 dreht sich der zylindrische Rotor 8, der auf einer auf zwei Rollagern io gelagerten Welle 9 festgekeilt ist. Die Rolllager sind in die Lagerschalen 5 eingebaut.The pump shown has .ein housing consisting of an annular Frame q., Two plate-like bearing shells 5 and two nuts 6. The bearing shells are supported laterally against an annular inner projection 7 of the frame q. and are fastened in the latter by means of nuts 6. Between the bearing shells 5, the cylindrical rotor 8 rotates, which is mounted on a roller bearing on two roller bearings Shaft 9 is wedged. The roller bearings are built into the bearing shells 5.

Der Rotor besitzt seitliche kegelförmige Ausbauchungen i i, die in die entsprechend geformten Lagerschalen 5 verkapselt ' eingepaßt sind und eine verhältnismäßig große Nabe bilden, in welche die Befestigungskeile des Rotors eingreifen. Durch diese Nabe erhält der Rotor einen gedrängten, kräftigen Bau, dessen Masse möglichst nahe der Rotationsachse des Rotors konzentriert ist, was den Vorteil hat, daß der Durchmesser des Rotors verhältnismäßig klein bemessen werden kann, zum Zwecke, einerseits die Fliehkraft des rotierenden Systems möglichst zu vermindern, anderseits den Rotor mit einer möglichst großen Anzahl Schaufeln ausrüsten zu können.The rotor has lateral conical bulges i i, which in the correspondingly shaped bearing shells 5 are encapsulated 'fitted and a relatively Form a large hub in which the mounting wedges of the rotor engage. By this hub the rotor receives a compact, strong structure, its Mass is concentrated as close as possible to the axis of rotation of the rotor, which has the advantage has that the diameter of the rotor can be dimensioned relatively small, for the purpose of reducing the centrifugal force of the rotating system as much as possible, on the other hand, to be able to equip the rotor with the largest possible number of blades.

Der zylindrische Teil des Rotors besitzt im Ausführungsbeispiel radiale, bis zur Welle 9 durchgehende Schlitze 12. Diese Schlitze haben rechteckigen Querschnitt und sind an ihrem inneren Ende durch die Welle 9 dichtend abgeschlossen. In jedem Schlitz ist eine Schaufel 13 gleitbar angeordnet, die von außen nach innen eine durchgehende Bohrung 14 aufweist. Zwischen dem inneren Ende der Schaufeln und der Welle 9 liegt je eine Schraubenfeder 15, die das Bestreben hat, die Schaufel aus dem Schlitz heraus und gegen den inneren, ringförmigen Vorsprung 7 des Pumpengehäuses zu drängen. Die zylindrische Mantelfläche des Rotors tangiert dichtend bei 16 mit der inneren Wand des Vorsprunges 7 zwischen einer Ansaugöffnung 17 und einer Austrittsöffnung 18 für die zu fördernde Flüssigkeit. Diese öffnungen des Gehäuses münden m eine von der :einen öffnung zur andern sich .erstreckende halbkreisförmige Ansaug- und Druckkammer 2o mit konstantem rechteckigem Querschnitt. Die Kammer :erstreckt sich konzentrisch um den Rotor und ist gebildet durch die zylindrische Mantelfläche des Rotors, dem in b@ezug auf die Rotationsachse des Rotors konzentrischen Teilstück der Wand i g des ringförmigen Vorsprunges 7, und seitlich durch die Lagerschalen 5.In the exemplary embodiment, the cylindrical part of the rotor has radial slots 12 extending through to the shaft 9. These slots have a rectangular cross section and are sealed off at their inner end by the shaft 9. A blade 13 is slidably disposed in each slot and has a through hole 14 from the outside to the inside. Between the inner end of the blades and the shaft 9 is a respective coil spring 15, which tends to push the blade out of the slot and against the inner annular projection 7 of the pump housing. The cylindrical outer surface of the rotor is in sealing contact at 16 with the inner wall of the projection 7 between a suction opening 17 and an outlet opening 18 for the liquid to be conveyed. These openings of the housing open into a semicircular suction and pressure chamber 2o extending from one opening to the other with a constant rectangular cross section. The chamber: extends concentrically around the rotor and is formed by the cylindrical outer surface of the rotor, the section of the wall of the annular projection 7 which is concentric in relation to the axis of rotation of the rotor, and laterally by the bearing shells 5.

Die Wirkungsweise der beschriebenen Pumpe ist folgende.The described pump works as follows.

Angenommen, der Rotor werde mittels einer Kraftmaschine in Drehung versetzt, in Richtung des Pfeiles in Abb. i, so führen die Schaufeln eine kreisende Bewegung um die Rotationsachse des Rotors aus und durchlaufen dichtend die Ansaug- und Druckkammer 2o, wobei sie entsprechend dem Profil der Wand i9 des ringförmigen Vorsprunges 7 abwechselnd in die Schlitze 12 hineingetrieben werden und wieder aus denselben heraustreten. Beim Passieren der Ansaugöffnung 17 saugen die Schaufeln Flüssigkeit an und fördern sie durch die, Kammer 2o nach der Austrittsöffnung 18. Beim Ansaugevorgang dringt die Flüssigkeit durch die Bohrung 14 ins Innere des Schlitzes 12, d. h. hinter die Schaufeln 13, und bewirkt einen Druckausgleich zwischen dem äußeren und dem inneren Ende der Schaufel, was zur Folge hat, daß die Schaufel unter der Wirkung der Feder 15 ungehindert aus dem Schlitz 12 heraustreten und mit der Wand 19 der Kammer 2o dichtend in Berührung kommen kann. Der gleiche Vorgang wiederholt sich, wenn die Schaufeln die Austrittsöffnung 18 passieren, indem ein Ausgleich zwischen dem hinter der Schaufel herrschendenDruck und dem im Austrittsstutzen herrschenden Gegendruck eintritt, sobald die Bohrung 1 q. zeit der öffnung 18 in Verbindu4g gelangt.Assume that the rotor is rotated by means of a prime mover offset, in the direction of the arrow in Fig. i, the blades perform a circling Movement around the axis of rotation of the rotor and pass through the suction and pressure chamber 2o, being according to the profile of the wall i9 of the annular Projection 7 are alternately driven into the slots 12 and out again step out the same. When passing through the suction opening 17, the blades suck Liquid and convey it through the chamber 2o after the outlet opening 18. During the suction process, the liquid penetrates through the bore 14 into the interior of the slot 12, d. H. behind the blades 13, and causes a pressure equalization between the outer and inner ends of the bucket, with the result that the bucket is under the action of the spring 15 emerge unhindered from the slot 12 and with the Wall 19 of the chamber 2o can come into sealing contact. Repeat the same process when the blades pass the outlet opening 18 by compensating between the pressure behind the blade and that in the outlet nozzle Back pressure occurs as soon as the hole 1 q. time of opening 18 is connected.

Die Wirkungsweise der Pumpe ist umkehrbar, d. h. die Flüssigkeit wird durch die öffnung 18 angesogen und tritt durch die öffnung 17 wieder aus, wenn der Rotor in entgegengesetzter Richtung des Pfeiles rotiert.The operation of the pump is reversible, i. H. the liquid will sucked through the opening 18 and exits through the opening 17 again when the The rotor rotates in the opposite direction of the arrow.

Die Pumpe kann ferner als Kraftmaschine benutzt werden, -indem ihr durch die eine oder andere der öffnungen 17, 18 ein Fluidum unter Druck zugeführt wird.The pump can also be used as a prime mover by using it A fluid under pressure is supplied through one or the other of the openings 17, 18 will.

Die beschriebene Pumpe bietet ma"";gfache Anwendungsmöglichkeiten auf dem Gebiete der Industrie, insbesondere eignet sie sich, dank ihrer gedrängten Bauart, als Geschwindigkeitswechselvorrichtung im Motorwagenbau:The pump described offers many possible uses in the field of industry, in particular, it is suitable thanks to its compactness Design, as a speed change device in motor vehicle construction:

Claims (1)

PATENTANSPRUCH: Drehkolbenpumpe mit in radialen Schlitzen des zylindrischen Rotors gleitbar angeordneten Schieberkolhen, dadurch gekennzeichnet, daß der Rotor an beiden Seiten kegelförmige Ansätze (i i) aufweist, die mittels 'kegelförmiger Lagerschalen (5) im Gehäuse verkapselt sind und welche die zur Befestigung des Rotors auf der Welle dienenden Keile aufnehmen.PATENT CLAIM: Rotary lobe pump with in radial slots of the cylindrical Rotor slidably arranged slide piston, characterized in that the rotor has conical lugs (i i) on both sides, which by means of 'conical Bearing shells (5) are encapsulated in the housing and which are used for fastening the rotor pick up the wedges used on the shaft.
DEG83931D 1931-11-02 1932-11-01 Rotary lobe pump with slide piston slidably arranged in radial slots of the cylindrical rotor Expired DE591076C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH157745T 1931-11-02

Publications (1)

Publication Number Publication Date
DE591076C true DE591076C (en) 1934-01-16

Family

ID=4411823

Family Applications (1)

Application Number Title Priority Date Filing Date
DEG83931D Expired DE591076C (en) 1931-11-02 1932-11-01 Rotary lobe pump with slide piston slidably arranged in radial slots of the cylindrical rotor

Country Status (2)

Country Link
CH (2) CH157745A (en)
DE (1) DE591076C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE871400C (en) * 1951-02-25 1953-03-23 Erhard Muhr Discharge lock for dust separator
DE1163679B (en) * 1959-05-14 1964-02-20 Teves Kg Alfred Hydrostatic rotary piston engine
DE1223988B (en) * 1953-05-16 1966-09-01 Hedwig Alice Wallimann Geb Hun Rotary piston machine
DE1236340B (en) * 1956-07-20 1967-03-09 Jabsco Pump Company Rotating positive displacement pump
DE2526447A1 (en) * 1975-06-13 1976-12-16 Daimler Benz Ag LIQUID PUMP

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599927A (en) * 1944-10-06 1952-06-10 William T Livermore Slipper pump

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE871400C (en) * 1951-02-25 1953-03-23 Erhard Muhr Discharge lock for dust separator
DE1223988B (en) * 1953-05-16 1966-09-01 Hedwig Alice Wallimann Geb Hun Rotary piston machine
DE1236340B (en) * 1956-07-20 1967-03-09 Jabsco Pump Company Rotating positive displacement pump
DE1163679B (en) * 1959-05-14 1964-02-20 Teves Kg Alfred Hydrostatic rotary piston engine
DE2526447A1 (en) * 1975-06-13 1976-12-16 Daimler Benz Ag LIQUID PUMP

Also Published As

Publication number Publication date
CH163200A (en) 1933-07-31
CH157745A (en) 1932-10-15

Similar Documents

Publication Publication Date Title
DE1901748C3 (en) Hydraulic rotary hose pump
DE591076C (en) Rotary lobe pump with slide piston slidably arranged in radial slots of the cylindrical rotor
DE2109589A1 (en) Multi-cylinder pump with adjustable piston strokes
DE102009037443A1 (en) Self-priming vane pump
DE1703528C3 (en) Control device for a multi-stage swash plate axial piston and swash piston machine set
DE10335939B4 (en) Inner housing for rotary piston engines
DE1653921C3 (en) Rotary piston pump
DE2909716A1 (en) DRAWER CENTRIFUGE
DE517824C (en) Centrifugal pump with shaft seal by auxiliary impeller and valve
DE1653855B1 (en) Rotary lobe pump
DE636012C (en) Rotating chiller
DE582165C (en) Rotary piston engine or pump in which two pistons rotate at different angular speeds
DE2437559A1 (en) COMPRESSOR
DE2744591A1 (en) Combined valve and radial piston pump - has discharge of one section connected to suction of next section
DE910327C (en) Impeller pump with fluid ring, especially for pumping gases
DE611309C (en) Rotary piston pump or rotary piston engine
CH239815A (en) Centrifugal machine through which liquid flows with sealing.
DE533006C (en) Rotary lobe pump with a fixed housing, abutments arranged on it and pistons constantly rotating around their own axis
DE543934C (en) Piston pump
DE168162C (en)
DE1653855C (en) Rotary lobe pump
DE2428034A1 (en) Double pump, blade-type, motor - has rotor with slotted ring taking main blade, and slotted side blades
DE537337C (en) Rotary lobe pump with eccentric piston drum rotating in a cylindrical housing
AT113750B (en) Rotating compression refrigeration machine.
DE3726748A1 (en) ROTARY PISTON PUMP