Abstract: A pump assembly including a plunger in communication with a pumpable media, a plurality of combustion chambers and a plurality of pistons. Each piston is associated with one of the combustion chambers. The pistons are in communication with the plunger and operatively arranged to together collectively urge the plunger in a pumping direction when the combustion chambers are triggered for displacing the pumpable media with the plunger. A method of pumping a media.

Abstract: The invention relates to a free piston type compressor 10 according to the invention comprises a first free piston 2a and a second free piston 2b interconnected by a torsion body 3a and 3b, and elastic bending element 4a and 4b to the central electromotor 5. In accordance with the invention the driving force is applied transversely to the direction of the expected displacement D of the first free piston and the second free piston.

Abstract: In a diaphragm pump with two diaphragms disposed in a pump housing and actuated by an adjusting piston which can be acted on alternately and which is arranged in between the diaphragms, the diaphragms are fixed with curvatures facing one another, or a curvature facing away from one another, and two reaction spaces are formed between the diaphragms and a cylinder, the reaction spaces accommodating the adjusting piston and being filled with a hydraulic medium and connected together in a constrained arrangement by means of hydraulic linkage lines. Both diaphragms remain in position and do not fold over during a transition from a suction stroke to a pressure stroke, because the diaphragms are continuously in contact with the hydraulic lines and are thereby fixed in place, so that the diaphragms are not subjected to alternating loadings.

Abstract: In compression systems having multiple sources of pulsation induced noise, provisions are made to reduce the noise by selectively varying the length of adjacent refrigerant lines leading to a common refrigerant manifold. Each of the refrigerant lines is associated with a particular noise source. The feature can be incorporated into compressors operating in parallel or in a single multi-rotor compressor having multiple suction or/and discharge ports. It is equally applicable to both discharge and suction ports.

Abstract: A pumping system and related methods involving an outer chamber and an inner chamber extending between two endplates, wherein the circumference of the inner chamber may be adjusted via a plurality of ribs and linear motors.

Abstract: A free piston type compressor includes a piston slidably fitted within a cylinder. A compression chamber is defined in the cylinder on one side of the piston, and a balance chamber is defined in the cylinder on the other side of the piston. A piston rod is connected to the piston and axially extends out of the cylinder through the balance chamber. A valve mechanism includes a suction valve, a discharge valve, and a valve plate, and is disposed on the end portion of the cylinder that faces the compression chamber. Since the piston rod extends out of the cylinder without passing through the compression chamber, the seal between the cylinder and the piston rod is not subjected to the high pressure working fluid, and the volumetric efficiency of the compressor is increased by reducing the dead clearance in the compression chamber.

Abstract: An end stop is disclosed for limiting the maximum displacement of a flexible member so as to minimize stress on this member and thus provide an extended surface life. The flexible member is rigidly supported at at least two spaced-apart points such that the flexible member can flex in the region between these points. The end stop includes a support member for clamping the flexible member at the two supporting points and a wall surface arranged in opposed, facing relationship to the flexible member in the region between the two points. The curvature of the wall surface is defined by first and second curves that form a continuous curvature and have first and second derivatives of the local angle .phi. of the tangent to the curve with respect to the distances along the curve which are zero.

Abstract: The present invention relates to a resonant piston compressor in which a double-sided piston reciprocates within a cylinder and defines a valved compression space on one side of the piston and a balance chamber on its other side. The invention further includes a movable head adjustable between first and second positions to effect a large change in the total volume of the balance chamber between the two positions. In one position, of the movable head an extended balance chamber volume is coupled to the balanced chamber while in the other position of the movable head, the extended balance chamber volume is decoupled from the balance chamber.

Abstract: In a resonant piston compressor utilizing a balance chamber to provide a gas spring effect for use in a heat pump arrangement and the like, an adjustable balance cylinder head which adjusts so as to increase or decrease the balance chamber volume so as to increase or decrease the stiffness of the balance chamber, depending upon the mode of operation desired.

Abstract: A pressure stabilization system for a linear compressor 20 piston 24 in which a check valve 68 and passages 72, 64 within the piston permit communication between a compressor work space and a non-working volume of gas 54 through an orifice 66 in the piston cylinder 30. The check valve and ports allow momentary fluid communication between the dead space volume 54 and the working volume 26. The fluid communication serves to stabilize working volume pressure and counteract the effects of gas leakage about the piston 24 and into the dead volume 54. This fluid communication only occurs when dead volume pressure is greater than working volume pressure and port 66 and 64 are axially aligned.

Abstract: A fluid pressure ratio transformer which may be utilized to couple pressure variations in a working fluid operating at a given input pressure ratio to a fluid coupled load operating at a different required output pressure ratio. The device is self-modulating to pump-load, whether operating at fixed stroke or fixed frequency. The pressure ratio transformer comprises a housing and a positive displacement element within the housing dividing the housing interior into first and second chambers, each of which is filled with a compressible fluid. The working fluid in the first chamber is subjected to periodic pressure oscillations while the fluid in the second chamber is either coupled to a fluid load or may itself be the pumped fluid. The effective spring coefficients and the mass of the piston are matched to the frequency of operation so that the piston oscillates at its natural frequency.