Category:Liquid-piston pumps

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For realising the object aimed at the invention makes use of a liquid piston engine or liquid piston pump liquid piston pump, the piston of which can be driven through a rockable double lever mounted on it by two driving shafts, the angle of which with respect to one another is adjustable.

Known engines of this kind are fitted with simple nonreturn Valves which require no special control. These known engines have the disadvantage, however, that they cannot rotate at high speeds of revolution.

The invention thus relates to liquid piston engines or liquid piston pumps, the piston of which is capable of being driven through a rockable double lever mounted on it by two driving shafts, the angle of which with respect to one another is adjustable. The invention consists in this that inlet and outlet of the cylinder, in which the piston moves, are controlled by a slide valve, the control shaft of which is liquid piston pump during the turning of the two driving shafts relatively to one another positively by half the amount, by which the two driving shafts turn with respect to one another.

Whilst in the case of engines or pumps, the piston of which is adapted to be driven in some other manner, for instance through an ordinary crank drive by a single driving shaft, it is known to control the inlet and outlet of the cylinder by a slide valve, such a control of inlet and outlet of the cylinder by means of a slide valve cannot be adopted in a simple manner in the case of engines or pumps, the piston of which can be driven through a rockable double lever mounted on it by two driving shafts capable liquid piston pump angular displacement with respect to one another.

This involves the difficulty, liquid piston pump the control drive may not be adjusted either in dependence on one of the driving liquid piston pump nor in dependence on the other driving shaft, if it is to function properly. The invention overcomes this difficulty by the expedient, that the control shaft of the slide valve is turned during the relative rotation of the two driving shafts positively by half the amount of the rotation.

Constructionally the invention makes use of a controlling diiferential gear, namely in such a manner that each liquid piston pump shaft drives one of the members of a controlling diflerential gear, the third member of which, rotates at the mean speed of revolution of the two driving shafts, drives the control shaft of the slide valve. The liquid piston pump has the further object of providing a specially advantageous construction of the controlling differential gear.

A constructional example of the invention is illustrated in the accompanying drawings, in which:. Figure 1 shows a vertical section through a pump according to the invention on the lines I-I of Figures 2, 3, 4 and 5. Figure 6 a diagrammatic representation of the crank of the two driving shafts in a position, in which they are turned by with respect to one another. In a casing consisting of the parts 1a, 1b, 1c and 1d a pump driving shaft 2 is supported, the end 2b of which can be driven in any suitable manner by an engine or the like not shown.

The shaft 2 is provided over a portion of its length with helical grooves 3 Figures 3 and 4 along which a gear wheel 4 is longitudinally displaceable with a simultaneous rotary motion. For its longitudinal displacement there is provided a collar 5 which is fixed liquid piston pump it and in which a control fork 6 engages, which by turning a control spindle S provided with a hand operated crank 7 can be displaced to and fro in the direction of the longitudinal liquid piston pump of the liquid piston pump 2.

The control spindle 8 is supported between the parts 1a and 1b of the casing. The gear wheel liquid piston pump is liquid piston pump in mesh with a broader gear wheel 9, which is keyed on a second driving shaft, namely the parallel shaft The shaft 2 and the parallel shaft 10, which thus always rotate in opposite directions, each carry a crank with a crank pin 2a and lila respectively, to which connecting rods 11 and 12 respectively are liquid piston pump.

The connecting rods engage with upper forked ends 11a and 12a respectively with pins 13 and 14 mounted on a rocking lever 15 with arms of equal length, which is adapted to rock about a pin The pin 16 is supported in the forked end 17 of the working piston 18 which slides in the working cylinder 19 which is in the part 1e of the casing. The forked end 17 is guided in the part 1d of the casing for performing an upward and downward motion.

Figure l shows the position of the shafts 2 and 10 and their crank pins 2a and 10a, in which the greatest stroke of the piston 18 is liquid piston pump. When, however, the two crank pins 2a and 10a occupy a relative position such as that shown in Liquid piston pump 6, a smaller stroke of the piston 18 will result. Should the angle shown in Figure 6 as 45 be increased to 90, the stroke of the piston would, on the shafts 2 and 10 turning, become equal to zero. The two-armed lever 15 will then only swing the pin 16, without any resultant motion of the pin and the piston The arrows 50 in Figures 1 and 6 show the direction of rotation of the shafts 2 and For the control of the piston 18 or the cylinder 19 there is a slide valve sliding piston Ztl with a reduced 'or neck part 20a.

The slide valve piston 20 is slidable in a horizontal bore 20h. The bore 2Gb is open towards the cylinder bore 19 and is also in communication through bores 21 and 22 with the inflow and outflow ducts 23, 24 which are in the part 1f of the casing liquid piston pump to which may be connected pipes 24a as indicated in Figure 3.

The slide valve piston 2t thus connects during the to and fro motion the cylinder 19 alternately with the inflow and outflow ducts 23 and A to and fro motion is effected by two eccentrics 25 and These are mounted on eccentric shafts 27 and 2S, which are supported in the part 1e of liquid piston pump casing.

The axes of the eccentric shafts liquid piston pump and 28 are perpendicular to the axis of the slide valve During synchronous rotation of the control shafts 27 and 28 and their eccentrics 25 and 26 the slide valve piston 20 Vwill be moved to and fro.

On the shaft 27 is mounted a sprocket wheel 29 and on the shaft 28a sprocket wheel The shaft 27 is extended and is supported in a further bearing 51 which is carried by al bracketxed to the casing Ie.

On the other end of the shaft 27 is a second sprocket Wheel 32, over which another chainV 33 runs, which also runs over a sprocket wheel 34 which rotates loosely on the shaft The sprocket wheel 34 is made in one piece with the casing liquid piston pump which forms a bearing cage for the pins 36a, 37a of two bevel wheels 36 and The pair of bevel wheels 36, 37 therefore revolves round the shaft 10, when the'casing 35 with the sprocket wheel 34 turns. The bevel wheels 36, 37 are permanently in mesh with a gear wheel 38 which is xed on the shaft 10 and with a gear wheel 39 which is made in one piece with a spur Wheel 40, The double gear wheel 39, 40 is liquid piston pump on the shaft The spur wheel 40 is permanently liquid piston pump mesh with a spur wheel 41 fixed to the shaft 2.

The whole of the gearing 34 to 41 thus represents a differential gear, one member 41 of which is fixed on the shaft 2, whilst the seco-nd member 38 is fixed on the parallel shaft An angular displacement of the shaft 10 with respect to the shaft 2 will produce liquid piston pump angular displacement of the sprocket wheel 34 of half the magnitude with respect to the parallel shaft 10 and with respect to the shaft 2.

By this means the correct setting of the control piston 20 to the working piston 18 is ensured. Modifications of the illustrated constructional example are of course possible. For instance, in place of two shafts 2, 10 lying parallel to one another with two cranks 2a, 10a lying next to one another shafts may be used, which lie one in the other and axially to one another, in which case the crank arms may be changed for eccentrics. When eccentrics and coaxial and parallel shafts are used, it is possible to link up'with the same control device a plurality of pistons 18 arranged liquid piston pump a circle, thus forming a 'radial arrangement of the cylinders.

An assemblage as defined in claim l wherein said control differential drive includes a gear on said driven shaft, a loosely mounted gear on said other shaft in mesh therewith, a bevel gear fixed to the loosely mounted gear, a second bevel gear fixed on said other shaft in spaced relationship to the first named bevel gear, a pair of rotating bevel gears arranged between and meshing with the bevel gears on the other shaft, a bearing cage for said pair of rotating.

An assemblage as defined n claim 2 wherein an eccentric on. A constructional example of the invention is illustrated in liquid piston pump accompanying drawings, in which: Figure 1 shows a vertical section through a pump according to the invention on the lines I-I of Figures 2, 3, 4 and 5; Figure 2 a section on the lines II--II liquid piston pump Figures l and 3; Figure 3 a vertical section on the lines IIl-Ill of Figures l, 2, 4 and 5; Figure 4 a horizontal section on the lines IV-IV of Figures 1 and 3; Figure 5 a horizontal section on lines V-V of Figures 1 and 3; and Figure 6 a diagrammatic representation of the crank of the two driving shafts in a position, in which they are turned by with respect to one another.

What I claim is: System for reversibly transforming rotary motion into self-guided rectilinear motion. Testing liquid piston pump with a drive, which converts to a rotational movement into a reciprocating movement of variable amplitude.

Testing device with a drive, which converts rotational movement into a reciprocating movement of variable amplitude. Hydraulic piston pump, particularly suitable for differential hydraulic transmissions.

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A Fluidyne engine is an alpha or gamma type Stirling engine with one or more liquidpistons. It contains a working gas often air , and either two liquid pistons or one liquid piston and a displacer.

The engine was invented in Working gas in the engine is heated, and this causes it to expand and push on the water column. This expansion cools the air which contracts, at the same time being pushed back by the weight of the displaced water column.

The cycle then repeats. The U-tube version has no moving parts in the engine other than the water and air, although there are two check valves in the pump. This engine operates at a natural resonance cycle that is "tuned" by adjusting the geometry, generally with a "tuning tube" of water.

In the classic configuration, the work produced via the water pistons is integrated with a water pump. The simple pump is external to the engine, and consists of two check valves , one on the intake and one on the outlet. In the engine, the loop of oscillating liquid can be thought of as acting as a displacer piston. The liquid in the single tube extending to the pump acts as the power piston.

Traditionally the pump is open to the atmosphere, and the hydraulic head is small, so that the absolute engine pressure is close to atmospheric pressure. The videos show operation of a U-tube type model Fluidyne engine. Hot pipe is heated by a heat gun, and water column oscillation builds up to a steady-state level. Second video shows a detail of the actual water displacement.

Fluidyne pumps are commercially available. From Wikipedia, the free encyclopedia. Oak Ridge National Laboratory. Archived from the original PDF on May 24, Retrieved August 6, This report was prepared in support of the Renewable Energy Applications and Training Project that is sponsored by the U.

It briefly outlines the performance that might be achievable from various kinds of Stirling-engine-driven irrigation pumps.

Some emphasis is placed on the very simple liquid-piston engines that have been the subject of research in recent years and are suitable for manufacture in less well-developed countries. In addition to the results quoted here possible limits on M4 and pumping head for different-size engines and various operating conditions , the method of calculation is described in sufficient detail for engineers to apply the techniques to other Stirling engine designs for comparison.

Liquid piston Stirling engines. A unifying perspective for some engines and refrigerators. Beale number West number. Timeline of heat engine technology.

Retrieved from " https: Stirling engines Piston engines Pistons. Articles containing video clips. Views Read Edit View history.

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