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
  • F04C9/00—Oscillating-piston machines or pumps
  • F04C9/005—Oscillating-piston machines or pumps the piston oscillating in the space, e.g. around a fixed point
• • 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
  • F01C9/00—Oscillating-piston machines or engines
  • F01C9/005—Oscillating-piston machines or engines the piston oscillating in the space, e.g. around a fixed point
• • 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
  • F04C2240/00—Components
  • F04C2240/30—Casings or housings

Definitions

• the present invention relates to pumps, more exactly to pumps for matter of high viscosity and specifically pumps, that translate a rotating drive without crank mechanism into fluid conveying..
• Wobble plate pumps are quite well known in the art, since it is the most simple form of transferring the rotation of a motor into a conveying movement of liquescent matter.
• the wobble plate alone can be applied, providing high efficiency, and - compared to piston pumps - with the advantage of low noise and vibration and particularly with low shear on the matter involved.
• Another object of this invention is to simplify the production of the pumping chamber. As up to actual designs the movement of the plate piston has to shift a partial volume of the pump chamber between two separated chamber volumes, the parted chamber needs to have an outline with a protrusion, against which a flat wobble plate must be pressed, so to effectively fulfil its pumping.
• a wobble plate pump of the here described integral type (so the wobble plate is not actuating secondary pistons in their housings) relates to a machine having an annular piston with a swash-like movement, that moves in a spherical working chamber.
• the necessary separation of the spherical working chamber into an input and an output volume is accomplished by a separation wall (further below called sword) that reaches from the top-middle section of the working chamber unto the center of the ball on the turning shaft, which guides the piston or swash ring in a circumferral groove.
• a separation wall further below called sword
• the swash plate necessarily has to have a radial recess, which is running along to the blade. This prevents co-rotation of the swash plate, but allows its inclination, so to transform the rotational movement of the axis into a waggling motion of the swash plate, which shovels the input volume over to the output.
• the amplitude of the wobbling motion thereby results from an angular offset of the bearing of the wobble ring to the input and output shaft axis , which may be in a range of about 5 0 to about 45 ° .
• the piston machine can be used both as a pump and as a generator, To be particularly effective for the function as a pump, a bending angle of about 30 0 has been found best.
• the outer rim of the swash-type piston needs to be shaped correspondingly to the spherical outer shape of the working chamber with the smallest clearance given to move without blocking. Together with the sword's clearance to the ball these two parameters mostly determine the efficiency of the system.
• the shape of the chamber has to be a spherical segment ending in inclined separation walls, as to be seen in Fig. 2b.
• this shape implies back taperings, which are intricate to be produced.
• a further problem of this kind of machines is a tendency of blocking, when debris may be pinched between the rim of the squash plate and the walls of the working chamber.
• the housing of said machine is separated with a bevelled cut whilst the cutting plane runs through the center of the ball (see cutting line 28 through the housings 1 in Fig.1 and Fig. 2a and 2b).
• the idea therefore is to maintain the metal housing rectangular and easily to be cast, but to bevel the separations between a pump head and the rest of the casing, so that the head part of the housing can be removed to get access to the pump chamber without dismounting the axis and the eccentric tappet.
• the input and output parts of the working chamber that feed or are fed into input- and outlet ports (3 and 4 in Fig. 1), are radially arranged to the housing.
• the piston is transformed into a swash plate with bevelled contour, which would allow the plate to be suspended against a vertical edge of the pump chamber. Therefore the working chamber could be designed with perpendicular walls on its front and back side (26 on Fig. 2a in comparison to 22 in Fig. 2b),
• the separating sword (9 in Fig. 1) is easily detachable with its base plate 8, so not to hamper the ball parts 5 and 10 to be taken off, and a conical recess 7 in the swash plate matches the shape of a thickening on the sword's edges (9 on Fig. 1). This is necessary for properly guiding of the swash plate (6a in Fig. 2a), which is considerably thicker than in conventional systems 6b, shown in Fig.2b.
• this shape of the sword also allows to put on a somewhat flexible sealing of self- lubricating plastic, possibly inserted into a keyway within the sword's arch.
• the arrangement of the parting plane of the two-part housing, perpendicular to the bearing axis of the swash ring in a fixed rotational position, further allows the head of the working space and the swash ring to be disassembled without taking the machine apart.
• the machine is functioning as a pump particularly , but not exclusively, suitable for use in chemical and biochemical area .
• a swash plate pump is illustrated, wherein a drive shaft 19 moves a swash plate 6 about a wobble point 20, so as to describe a double conical surface.
• the wobble point 20 coincides with the center point of the spherical surface 6 of the swash plate and the spherical inner surface of the pump chamber 17.
• the pump housing 1 is split from the pump head 2 at a bevelled cut 28.
• the drive shaft 19 turns the eccentric split ball, consisting of the parts 5 and 10, thereon the wobble plate 6 would turn, would it not be restricted to a wagging movement by the sword 9, which holds the swash plate 6 in its recess 7.
• the shaft is then suspended in the end bearing 16 on the front plate 2, travelling through its sub-parts11 and 12, whereas the front part 2 and the housing 1 are sealed with the O-ring 14.
• the input and output ports 3 and 4 are mounted radially to the axis. This, compared to other constructions, allows to dismount the head without disassembly of intake and exhaust.
• Fig 2 a and 2b are simplified longitudinal cuts which should exemplify the difference between the shape of the pump housing 1 in prior art on Fig. 2b and on the here disclosed invention in Fig. 2a.
• the wobble plate 6b in Fig. 2b is flat and the shape of the working chamber has protrusions 21 to 24
• the wobble plate 6a in Fig. 2a is bevelled and the front and aft walls of the working chamber 25 and 26 are flat, but the resulting working volume 27 a and 27b are almost identical.
• the housing 1 in Fig. 2a obviously is much easier to be fabricated.

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• 2015
  • 2015-01-30 EP EP15714275.3A patent/EP3271585A1/de active Pending
  • 2015-01-30 WO PCT/IB2015/000095 patent/WO2016120655A1/en unknown

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