Rotary-piston pumps specially adapted for elastic fluids

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F04Liquid pumps F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

F04C18/00Rotary-piston pumps specially adapted for elastic fluids

F04C18/02of arcuate-engagement type F04C18/0207both members having co-operating elements in spiral form F04C18/0215where only one member is moving F04C18/0223with symmetrical double wraps F04C18/023where both members are moving F04C18/0238with symmetrical double wraps F04C18/0246Details concerning the involute wraps or their base F04C18/0253Details concerning the base F04C18/0261Details of the ports F04C18/0269Details concerning the involute wraps F04C18/0276Different wall heights F04C18/0284Details of the wrap tips F04C18/0292Ports or channels located in the wrap F04C18/04of internal-axis type F04C18/045having a C-shaped piston F04C18/06of other than internal-axis type F04C18/063with coaxially-mounted members having continuously-changing circumferential spacing between them F04C18/067having cam-and-follower type drive F04C18/07having crankshaft-and-connecting-rod type drive F04C18/073having pawl-and-ratchet type drive F04C18/077having toothed-gearing type drive F04C18/08of intermeshing-engagement type F04C18/082Details specially related to intermeshing engagement type pumps F04C18/084Toothed wheels F04C18/086Carter F04C18/088Elements in the toothed wheels or the carter for relieving the pressure of fluid imprisoned in the zones of engagement F04C18/10of internal-axis type with the outer member having more teeth or tooth equivalents F04C18/103with a crescent shaped filler element, located between the inner and outer intermeshing elements F04C18/107with helical teeth F04C18/1075the inner and outer member having a different number of threads and one of the two being made of elastic material F04C18/113the inner member carrying rollers intermeshing with the outer member F04C18/12of other than internal-axis type F04C18/123with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor F04C18/126with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor F04C18/14with toothed rotary pistons F04C18/16with helical teeth F04C18/165having more than two rotary pistons with parallel axes F04C18/18with similar tooth forms F04C18/20with dissimilar tooth forms F04C18/22of internal-axis type with equidirectional movement of co-operating members at the points of engagement, or with one of the co-operating members being stationary, the inner member having more teeth or tooth equivalents than the outer member F04C18/24of counter-engagement type F04C18/26of internal-axis type F04C18/28of other than internal-axis type F04C18/30having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members F04C18/32having both the movement defined in group F04C18/02 and relative reciprocation between the co-operating members F04C18/321with vanes hinged to the inner member and reciprocating with respect to the inner member F04C18/322with vanes hinged to the outer member and reciprocating with respect to the outer member F04C18/324with vanes hinged to the inner member and reciprocating with respect to the outer member F04C18/328and hinged to the outer member F04C18/332with vanes hinged to the outer member and reciprocating with respect to the inner member F04C18/336and hinged to the inner member F04C18/34having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members F04C18/344with vanes reciprocating with respect to the inner member F04C18/3441the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation F04C18/3442the surfaces of the inner and outer member, forming the inlet and outlet opening F04C18/3443with a separation element located between the inlet and outlet opening F04C18/3445the vanes having the form of rollers, slippers or the like F04C18/3446the inner and outer member being in contact along more than one line or surface F04C18/3447the vanes having the form of rollers, slippers or the like F04C18/3448with axially movable vanes F04C18/348the vanes positively engaging, with circumferential play, an outer rotatable member F04C18/352the vanes being pivoted on the axis of the outer member F04C18/356with vanes reciprocating with respect to the outer member F04C18/3562the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation F04C18/3564the surfaces of the inner and outer member, forming the working space, being surfaces of revolution F04C18/3566the inner and outer member being in contact along more than line or surface F04C18/3568with axially movable vanes F04C18/36having both the movement defined in groups F04C18/22 and F04C18/24 F04C18/38having the movement defined in group F04C18/02 and having a hinged member F04C18/39with vanes hinged to the inner as well as to the outer member F04C18/40having the movement defined in group F04C18/08 or F04C18/22 and having a hinged member F04C18/44with vanes hinged to the inner member F04C18/46with vanes hinged to the outer member F04C18/48Rotary-piston pumps with non-parallel axes of movement of co-operating members F04C18/50the axes being arranged at an angle of 90 degrees F04C18/52of intermeshing engagement type F04C18/54the axes being arranged otherwise than at an angle of 90 degrees F04C18/56of intermeshing engagement type F04C18/565the axes of cooperating members being on the same plane