81results about "Free piston pumps" patented technology

A system according to this invention for transmitting power hydraulically to and from the wheels of a motor vehicle includes an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower pressure, and a pump/motor driveably connected to the wheels and having an inlet, an outlet, and a variable volumetric displacement for pumping fluid between the accumulator and the reservoir. A first circuit connects the inlet to the reservoir and the outlet to the accumulator. A second circuit, which connects the inlet to the accumulator and the outlet to the reservoir, includes a first path having a low flow rate capacity, a second path having a higher flow rate capacity. A controller switches between pumping operation and motoring operation, opens and closes the first path during motoring operation, and reduces the displacement before switching between pumping operation and motoring operation. The first path includes a first valve responsive to the controller for opening and closing a connection between the accumulator and the inlet, and a first orifice arranged in series with the first valve having a relatively low flow rate capacity. The second path, arranged in parallel with the first path between the accumulator and the inlet, includes a second valve responsive to the controller for opening and closing a connection between the accumulator and the inlet, and a second orifice arranged in series with the second valve having a higher flow rate capacity than that of the first orifice.

A method is provided for compressing a gas in a single cycle and in a single cylinder to a pressure of at least 17.2 Mpa with a compression ratio of at least about five to one. The method further comprises dissipating heat from the cylinder during the compression stroke whereby the gas is discharged with a temperature significantly less than isentropic. The apparatus comprises a hollow cylinder and a reciprocable free-floating piston disposed therein. The piston divides the cylinder into: (a) a compression chamber within which a gas can be introduced, compressed, and discharged; and, (b) a drive chamber, into which a hydraulic fluid can be introduced and removed for actuating the piston. The apparatus further comprises a piston stroke length to piston diameter ratio of at least seven to one. For operating the apparatus with a compression ratio of at least five to one, an outlet pressure of at least 17.2 Mpa, and a gas discharge temperature significantly less than isentropic, the apparatus can further comprise a variable displacement hydraulic pump for controlling piston velocity, an electronic controller for maintaining an average piston velocity that is less than 0.5 feet per second, and a heat dissipator for dissipating heat from the cylinder.

A linear motor compressor including a compressor housing and a cylinder housing having a plurality of opposing compression chambers. A piston freely reciprocates within the cylinder housing using a linear electric motor.

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.

The refrigeration compressor is a double-acting refrigeration compressor, comprising a piston (7), which is freely guided on two cylinder sections (41, 42) that are opposite each other and that cannot be moved relative to each other, and which has a flow channel (8) that extends internally through the piston (7), wherein each cylinder section (41, 42) and the piston (7) have at least one check valve (10, 11, 12) along the flow channel (8), wherein the check valves (10, 11, 12) are arranged in such a way that the flow directions thereof are oriented in the same direction.

Provided is an improved bypass durable dart plunger that descends faster in a hydrocarbon well, is capable of lifting more fluids and has a durable and replaceable clutch assembly. The various components of the durable dart plunger includes a sleeve, a dart body with a one or more flow ports (chokes) cut at right angles through the dart body, a pin and a replaceable clutch assembly (also referred to a retention assembly). The chokes can be of varying sizes. In one embodiment, the clutch assembly includes a plurality of clutch mechanisms wherein each mechanism includes a ball, a socket screw and a resilient spacer.

A linear motor compressor including a compressor housing and a cylinder housing having a plurality of opposing compression chambers. A piston freely reciprocates within the cylinder housing using a linear electric motor. A piston position feedback control system provides adaptive current output as a function of position feedback and/or velocity feedback from the piston and/or the electric motor, to directly power and control the electric motor, wherein the piston reciprocates without assistance from a mechanical spring or other equivalent centering force.

The invention relates to a thermal compressor for recycling low pressure steam in heating system, especially the thermal compressor for improving heating supply steam pressure in steam power plant, comprising two cylinders with inlet and outlet port of high and low pressure steam (1), coaxial piston (2) in each cylinder and control system for it. Compared with prior technology, in the invention according to the principle that low pressure steam is not contacted with high pressure steam, the pressure of low pressure steam rises by low pressure steam in compressed way of piston and two cylinders work in turn so that the press of low pressure steam rises to destined value, outlet one-way valve of low pressure steam is opened and the steam is transported into steam supply pipe by the control system. It is energy saving and efficiency improving with two to four times by experiment testifying. It is no constrained by the parameter of high and low pressure steam and wide application while it is provided with simple structure and low cost.

A multipurpose gravity air compressor employs a piston (40) traveling down a cylinder (129) by the force of gravity compressing compressible fluid (140) in one or more compressible fluid chambers (137). Compressed fluid is emptied out of compressible fluid chambers (137) through compressible fluid exit (118) for use locally or downstream. A transporter such as transporter assembly 50 grabs piston (40) and recovers it back to opening (124) at predetermined intervals and deposits piston (40) into cylinder (129) to start another cycle. Multipurpose gravity air compressor through the generation of heat through compressing compressible fluid (140) also enjoys being a heat source. Air compressor 200 can provide a means for producing energy through compressing compressible fluid (140) and a source of heat for generating steam to produce electricity on-site or downstream. Water (condensation), possibly thousands of gallons a year, could be another rainfall-independent water source advantage enjoyed.

This invention provides a compressor with brushless single-phase linear motor, which includes a movable cylinder associated with a permanent magnet array, at least a stationary electromagnetic winding set and a pair of stationary pistons. A partition plate is disposed in the movable cylinder to form a first sub-cylinder and a second sub-cylinder. The front ends of the pair of the stationary pistons are respectively placed in either of two openings of the movable cylinder at its two ends. An alternate current applied to the stationary electromagnetic winding set to generate alternately attracting/repelling forces to the permanent magnet array. The movable cylinder is hence alternately pushed forward and backward. The volumes of the first and second sub-cylinders are changed to compress air in the first sub-cylinder or the second sub-cylinder.

The invention discloses a synchronous movement realization based free-piston compressor. A gas storage tank is connected with a cushion cylinder and a compressor cylinder, a power cylinder is arranged in the gas storage tank and arranged in the cushion cylinder and the compression cylinder, power pistons are arranged in the power cylinder and connected with piston rods, the piston rods are connected with a cushioning piston and a compressor piston, the cushioning piston is arranged in the cushion cylinder, and the compressor piston is arranged in the compressor cylinder. The compressor cylinder is provided with a first suction valve and a first exhaust valve, the power is provided with a gear, a gear shaft is arranged in the gear and fixed to the power cylinder, and racks are arranged on the gear, meshed with the gear and fixed to the piston rods correspondingly. The power cylinder is provided with suction holes and exhaust holes. The free-piston compressor can make moving piston sets completely equal in mass, inertia force during operation of a machine is fully balanced, bearing capacity is large, and accurate control in stroke is realized.

The invention relates to a hydraulic driving air compressor. The hydraulic driving air compressor is characterized by comprising a valve shell, a left cylinder body provided with a left air chamber, aright cylinder body provided with a right air chamber, a piston which is provided with an axial channel and in a T shape, a large valve core, a small valve core, a left plunger and a right plunger, wherein the diameter of the large valve core is greater than the diameter of a valve opening; and the left plunger is arranged in the left cylinder body and can slide left to right, the inner end of the left plunger is connected with the left end of the axial channel of the piston and can slide left to right along with the piston, and the inner end of the right plunger is connected with the right end of the axial channel of the piston and can slide left to right along with the piston. The air compressor has high integration degree and compact volume; and because the second outlet end of a firstthrough-flow hole communicates with an oil returning cavity and a left piston cavity, a certain distance is arranged from each of the left and right ends of the piston to the bottom surface of the corresponding cylinder body, and in this way, the fact that reversing of a liquid-controlled reversing valve assembly can be completed before the piston collides with two end covers is ensured, therefore, non-impact vibration and less noise are achieved.

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.

The invention discloses an air cylinder which comprises an arc-shaped cylinder body and a piston assembly, wherein an air cavity is formed in the arc-shaped cylinder body; the piston assembly is movably accommodated in the air cavity. The air cylinder further comprises a first bearing part; the first bearing part comprises a shell and a first magnet fixedly accommodated in the shell; the shell is mounted on the outer side surface of the arc-shaped cylinder body in a sliding manner; the piston assembly comprises a first piston and a second piston rotatably connected with each other; the first piston comprises a first connecting rod as well as a second magnet and a piston body sequentially fixedly arranged on the first connecting rod in a sleeving manner; the second piston comprises a second connecting rod as well as another second magnet and another piston body sequentially fixedly arranged on the second connecting rod in a sleeving manner; the second connecting rod is rotatably connected onto the first connecting rod; magnetism of each second magnet is opposite to that of the first magnet; and when external gas pushes the piston assembly to move from one end of the arc-shaped cylinder body to the other end of the arc-shaped cylinder body along the air cavity, the first bearing part can slide to the other end of the arc-shaped cylinder body from one end of the arc-shaped cylinder body on the outer side surface of the arc-shaped cylinder body along with the piston assembly.