Abstract: Provided herein is a mechanical resonant system, comprising a frame; at least one pump disposed on the frame; one or two masses coupled to the frame by a first plurality of resilient members; and at least one voice coil actuator disposed within the frame and coupled to the at least one pump or to the one or two masses; wherein when the system comprises two masses, a second plurality of resilient members couple the masses to each other. Also provided are methods for using these mechanical resonant systems to evacuate a chamber, to compress air, or sense changes in pressure.

Abstract: In order to enable a continuous adjustment of the variable clearance space (1) of a reciprocating compressor (15), a threaded spindle drive with a threaded spindle nut (10) and a threaded spindle (9) is provided as an adjusting device (7), wherein the threaded spindle nut (10) is embodied as a plastic nut (20) with internal thread (24), the plastic nut (20) is arranged with an external thread (23) on an internal thread (22) of a nut carrier (21) of the threaded spindle nut (10), and the thread height (y) of the internal thread (22) of the nut carrier (21) and the thread height (x) of the external thread (25) of the threaded spindle (9) is respectively embodied with 50 to 80% of the radial thickness (d) of the plastic nut (20) and the plastic thickness is at least 15% of the thread pitch (z1) of the internal thread (24) at least in the region of the thread flanks (26) of the internal thread (24) of the plastic nut (20).

Abstract: A piston pump includes a pump mechanism configured to compress fluid sucked from an inlet port by increasing or decreasing a volume of a pump chamber which faces a front end of a piston by reciprocating the piston housed in a housing, a feed mechanism including a feed ring mounted to an annular groove provided at an outer periphery of the piston and following a motion of the piston, a feed chamber formed between the feed ring and the housing, and a valve portion. The piston pump includes a pressure wall provided at the piston and configured to contact the feed ring to axially move the feed ring, and a restriction portion provided at the feed ring and configured to engage with an outer periphery of the piston at a position approximate to the pressure wall for restricting a radial displacement of the feed ring on the piston.

Abstract: The present invention relates to a piston pump. A piston with at least one transverse bore and a longitudinal blind bore, has a plate element with an opening, arranged on the piston at an opening of the longitudinal blind bore. The invention includes an inlet valve, an outlet valve, and a pressure chamber arranged between the inlet valve and the outlet valve. The inlet valve has a pretensioning element, a closing element, and a sealing seat, which sealing seat is built on the plate element.

Abstract: A piston pump includes a pump mechanism for changing a volume of a pump chamber to move a piston in a housing, and a feed mechanism that has a feed ring attached to a circular groove portion of the piston to be slaved with a movement of the piston. The feed mechanism is located in a suction passage from a suction port to a pump chamber, and the piston has a flange portion protruding radially outwardly. An inner peripheral surface of the feed ring has an inner-diameter enlarged portion extending radially outwardly to have an enlarged passage portion between the inner peripheral surface of the feed ring and the outer peripheral surface of the piston, and a valve portion for opening and closing a suction passage is constructed of an end portion of the inner diameter enlarged portion of the feed ring and the flange portion.

Abstract: An air pump has a one-piece cylinder and a piston assembly. The one-piece cylinder has a body, a cap, a pedal and a base formed together by injection molding and welding process. The piston assembly is mounted in the one-piece cylinder and has a rod, a handle and a piston. The one-piece cylinder is structurally firm and provides excellent hermetic characteristics.

Abstract: The present invention relates to a piston pump. A piston with at least one transverse bore and a longitudinal blind bore, has a plate element with an opening, arranged on the piston at an opening of the longitudinal blind bore. The invention includes an inlet valve, an outlet valve, and a pressure chamber arranged between the inlet valve and the outlet valve. The inlet valve has a pretensioning element, a closing element, and a sealing seat, which sealing seat is built on the plate element.

Abstract: A downhole pump has a barrel and a plunger which reciprocate with respect to each other. The plunger has a first portion with a first seal, a second portion and a third portion with a second seal. The second portion is intermediate the first and second portions. A balancing chamber is formed between the plunger second portion and the barrel. The balancing chamber communicates with the plunger interior by way of an opening. A sand snare chamber is provided with respect to the opening so as to prevent sand from contacting the seals in the balancing chamber.

Abstract: The present invention is a container lid assembly that includes an integral pump. A main feature of the present invention is a pump configuration that activates the reciprocating linear motion of the piston portion of the pump by the rotational movement of a pump actuating element that is interconnected to the piston portion. The pump configuration of the present invention may be configured so as to create at least a partial vacuum within the container. Alternatively, the pump configuration may be configured so as to pressurize the interior volume of the container. The lid consists of two major pieces, a seat portion that includes the pump cylinder, and a rotatable piston portion that includes the pump piston and the interconnected piston actuating element section. In preferred embodiments of the present invention, the pump piston and the piston actuating element section are integrally formed.

Abstract: A compact compressor including one or more heads. Each of the compressor heads is configured with at least one of the intake and output valves incorporated into the piston head. The compact compressor also has a cylinder with a reduced mass, increased surface area, and metal to metal contact with the housing for greater dissipation of heat generated by the compressor.

Abstract: A valve plate assembly is provided including a plastic plate having a plurality of apertures therethrough, including at least one suction passage and at least one exhaust passage. A suction reed valve is disposed over the suction passage and an exhaust reed valve is disposed over the exhaust passage. A cylinder gasket is molded to a first side of the plastic plate and is adapted to seal around a cylinder of a cylinder housing. The cylinder gasket is recessed in a groove in the plastic plate. An end cap gasket is molded to a second side of the plastic plate and is adapted to seal against an end cap of a compressor. The end cap gasket is recessed in a groove in a second side of the plastic plate. The reed valves contact the plastic plate and are, therefore, quieter than a reed valve that is operated against a metal plate. The integration of the gasket into the recessed grooves of the plastic valve plate eliminates potential leak paths that exist with current designs.

Abstract: The present invention relates to a reciprocating piston pump comprising: at least one cylinder with an inlet for a pressure medium; a piston slidable in the cylinder between a first and a second position, and forming a pressure chamber in the cylinder; a first valve member which is received in the piston and which in an open position mutually connects the cylinder spaces on either side of the piston; a second valve member which is received in the piston and which in an open position connects a pressure medium passage formed in the piston to an outlet of the pump; a resilient member urging the piston in the first position; an actuating member connected to the valve members and which are embodied such that in the first position the first valve member is closed and the second valve member is opened and in the second position the first valve member is opened and the second valve member is closed, wherein the piston is moved to the second position by the pressure medium.

Abstract: A positive displacement pump for pumping fluids from a downhole formation to the earth's surface is provided. The pump first comprises a plunger. The plunger is reciprocated axially within the wellbore by a linear actuator, such as a submersible electrical pump, in order to form an upstroke and a downstroke. A pump inlet is disposed near the bottom end of the plunger, while a pump outlet is disposed near the top end of the plunger. The pump is configured such that it is able to pump a first volume of fluid upward within the wellbore during the pump's upstroke, and a second volume of fluid upward within the wellbore during the pump's downstroke. Thus, the pump is “double-acting.

Abstract: A piston pump includes a pump mechanism for changing a volume of a pump chamber to move a piston in a housing, and a feed mechanism that has a feed ring attached to a circular groove portion of the piston to be slaved with a movement of the piston. The feed mechanism is located in a suction passage from a suction port to a pump chamber, and the piston has a flange portion protruding radially outwardly. An inner peripheral surface of the feed ring has an inner-diameter enlarged portion extending radially outwardly to have an enlarged passage portion between the inner peripheral surface of the feed ring and the outer peripheral surface of the piston, and a valve portion for opening and closing a suction passage is constructed of an end portion of the inner diameter enlarged portion of the feed ring and the flange portion.

Abstract: An activatable pump is provided. The pump includes a piston in slideable communication with an inner surface of a cylinder, which has a first end and a second end. A first control valve and a second control valve are in physical communication with the first end of the cylinder. The first control valve and the second control valve are in fluid communication with the piston. Either the first control valve or the second control valve is not a check valve. A first check valve and a second check valve are in physical communication with the second end of the cylinder. The first check valve and the second check valve are in fluid communication with the piston. A pressure controller communicates with the piston to control an amount of force by or on the piston. A method and an energy recovery apparatus are also provided.

Abstract: A compressor for a refrigeration device comprising a compartment, a piston which can be displaced inside the compartment, and valves which are arranged between the compartment and a suction connection or a pressure connection. The movable parts of the valves are provided with a coating that is harder than the movable parts.

Abstract: A reciprocating downhole pump has a gas separator located at its bottom end. The separator forms a chamber that is expanded and contracted when the pump is reciprocated. Expansion and contraction of the chamber occurs by either the plunger reciprocating in the chamber or a piston coupled to the plunger reciprocating in the chamber. The chamber has an orifice therein so that during reciprocation fluid flows in and out of the orifice. The orifice is sized so as to subject the fluid to a pressure drop, wherein gas in the fluid is separated from the liquid.

Abstract: The radial piston pump possesses a pump housing in which a plurality of cylinder bores are provided having pump pistons placed therein which can be driven by a cam. Further, an arrangement is provided in each pump piston (3) wherein the inlet or the outlet, or both the inlet as well as the outlet of the fluid in each cylinder bore, is controlled.

Abstract: A dual-direction inflator has a tube and a cover mounted on the tube. A rod extends through the cover and is inserted in the tube. A piston is received in the tube and mounted on an end of the rod. The piston has an air-in chamber and an air-out chamber defined therein. A handle is mounted at the other end of the rod. The handle has an inlet and an outlet formed at a middle portion thereof. An inner tube is received in the rod and communicated with the inlet and with the air-in chamber. By a space defined between the inner tube and the rod, the air-out chamber is communicated with the outlet.

Abstract: A displacement machine (10) comprises a housing (11), a reciprocating member (12) reciprocable linearly along an axis of reciprocation (13) in the housing (11) and defining with the housing (11) first (14) and second (15) variable volume chambers. A fluid inlet (17) is connected to the first variable volume chamber (14). A fluid outlet (78) is connected to the second variable volume chamber. An inlet value (16) allows flow of fluid through the fluid inlet (17) into the first variable volume chamber (14) and prevents flow of fluid from the first variable volume chamber (14) out of the fluid inlet (17).

Abstract: A dual-direction inflator has a tube and a cover mounted on the tube. A rod extends through the cover and is inserted in the tube. A piston is received in the tube and mounted on an end of the rod. The piston has an air-in chamber and an air-out chamber defined therein. A handle is mounted at the other end of the rod. The handle has an inlet and an outlet formed at a middle portion thereof. An inner tube is received in the rod and communicated with the inlet and with the air-in chamber. By a space defined between the inner tube and the rod, the air-out chamber is communicated with the outlet.

Abstract: A pump includes a pump housing with a bore, an inlet and an outlet, a piston movable in the bore, and an inlet valve and an outlet valve which are formed by a cup seal. The piston has a portion of a large diameter and a portion of a small diameter, each of the portions extending through one of the cup seals, whereby a pump chamber is provided between the cup seals. In a first embodiment, the cup seal encompassing the large diameter is the inlet valve and the cup seal encompassing the small diameter is the outlet valve, and the cup seals are arranged in an annular radial groove provided in the bore. In another embodiment, the cup seal encompassing the large diameter is the outlet valve and the cup seal encompassing the small diameter is the inlet valve. Here the cup seals are arranged in an annular radial groove provided on the piston. For noise reduction purposes, the piston is tapered from the large diameter toward the small diameter.

Abstract: A pump includes a main body, a piston slidably received in the main body, and a hose having a first end attached to an end of the main body and a second end attached to the piston. A handle is attached to a piston rod, which, in turn, is attached to the piston. Air is outputted to a main passage via the hose during an outward stroke. Air is outputted to the main passage via a hole defined in the end of the main body during an inward stroke.

Abstract: An inverted, displacer type piston pump for metering and dispensing liquids in which the cylinder is located beneath the piston and reciprocated via an actuator below the cylinder, and where the piston is held fixed. The liquid ingress and egress to and from the cylinder of the pump is via a cylindrical port through the piston along its cylindrical axis. The pump is designed so that liquid product loss through the pump is prevented without the use of elastomeric or compliant seals in the liquid contact product areas of the pump. In addition, the pump cylinder is capable of being positioned via its reciprocating actuator such that all of the liquid product contact parts are open and accessible to cleaning and sterilizing fluids which may be introduced into the pump through the liquid product supply port of the pump, thereby enabling cleaning and sterilization of the pump without its disassembly.

Abstract: An object of the present invention is to provide a pump which suppresses a decrease in the volumetric efficiency of the pump to a great extent even in case that the kinematic viscosity of a fluid is high with a compact structure of the pump itself.

Abstract: An improved pump structure including a shaft tube, a pivot tube, a piston element, a push and pull element and a handle element. The shaft tube is inserted inside the tube. The pivot tube's two ends are respectively connected to the handle element and the piston element. The piston element is disposed in the air chamber of the push and pull element. By an ingenious arrangement of holes, tubes and unidirectional valves, the reciprocating travels of the push and pull element permit simultaneous pumping and air intake, increasing the pumping efficiency.

Abstract: A device for providing auxiliary pumping capabilities for a sump pump system and other low volume pumping systems. The in-line pumping device includes a tubular element with threaded ends to be mounted in the discharge pipe line of a sump pump system. A piston in the tubular element may be reciprocated by manually moving a drive shaft extending laterally from the piston through a threaded boss in the tubular element. A valve means permits the unidirectional flow of fluid through a center bore in the piston. If the electric pump is inoperable, the manual pump of the present invention may be used to pump liquid from the sump through the discharge pipe line.

Abstract: Air pumps particularly suitable for use with bicycles includes a first elongated tube to form a pump chamber and housing, a second elongated tube coupled with a piston in the first tube to reciprocate the piston within the pump chamber. A flexible hose extends from the piston and through the second tube and has at its exposed end an air valve coupling. The first and second tubes are releasably secured to permit use of the pump as a seat post. The pump includes a first valve on the outside of the piston between atmosphere and a closed end of the pump chamber and a second valve inside the piston between the closed end of the chamber and the flexible hose. The first valve is configured to provide greater seal effect as pressure builds in the closed end of the pump chamber.

Abstract: A downhole well pump system comprises a reciprocating piston pump disposed in a fluid conduit in a wellbore which is filled with a driving fluid having a density preferably greater than the production fluid being pumped. The pump cylinder has a transverse partition and a piston assembly including an elongated piston rod extending through the partition and connected at its opposite ends to spaced apart pistons. The pump pistons and the cylinder partition divide the cylinder into a production fluid intake chamber, a production fluid transfer and delivery chamber, a driving fluid chamber and a second production fluid delivery chamber. Production fluid is conducted to the surface through a production fluid conduit disposed coaxial within the driving fluid conduit.