93results about "Positive-displacement liquid engines" patented technology

An implantable, miniature pump assembly having a flexible elastic bladder actuating assembly. The bladder, in the non-flexed state, has an elongated, substantially rectangular profile, with a predetermined internal volume or capacity. Influent and effluent conduits extend in opposite directions from respective end portions of the bladder. Each of the conduits include one way valves disposed therein to limit fluid flow to a single direction into and through the bladder. Contraction and expansion of the bladder by means of energy harvested from the dynamic environment in which it is implanted in response to ambient random dynamic motion creates alternating pressure and vacuum within the bladder, alternately drawing fluid into the bladder through the influent conduit, and forcing fluid from the bladder via the effluent conduit. The bladder pump assembly harvests its operational energy from the random dynamic motion of the surrounding organs and tissues and therefore does not require an internal or external power source.

An exemplary device and method for microfluidic transport is disclosed as providing inter alia a passive check valve (100), a fluid inlet channel (210), a fluid outlet channel (220) and a pumping cavity (240). The fluid inlet channel (210) is generally configured to flow a fluid through the check valve (100). The check valve (100) generally provides substantially passive means for preventing or otherwise decreasing the incidence of purged outlet fluid re-entering either the pumping cavity (240) or the fluid inlet channel (210). Accordingly, the reduction of backflow generally tends to enhance overall pumping performance and efficiency. Disclosed features and specifications may be variously controlled, adapted or otherwise optionally modified to improve micropump operation in any microfluidic application. Exemplary embodiments of the present invention representatively provide for substantially self-priming micropumps that may be readily integrated with, for example, existing portable ceramic technologies for the improvement of device package form factors, weights and other manufacturing and/or device performance metrics.

A low profile pump inlet for an implantable blood pump is disclosed. The low profile pump inlet has an inflow diffuser for attachment to a conduit bearing an inflow of a fluid such as blood and an outflow orifice in fluid connection with the diffuser. The outflow orifice is configured to direct the fluid from the diffuser into a pump such as an implantable blood pump. The low profile pump inlet helps to suppress the effects of upstream pipe bends on the blood traveling through the inlet. The inlet thus provides a flow having a substantially uniform velocity profile into the blood pump.

A capacity control algorithm for a multiple compressor liquid chiller system is provided wherein the speed and number of compressors in operation are controlled in order to obtain a leaving liquid temperature setpoint. In response to an increase in the load in the chiller system, the algorithm determines if a compressor should be started and adjusts the operating speed of all operating compressors when an additional compressor is started. In response to a decrease in the load in the chiller system with multiple compressors operating, the algorithm determines if a compressor should be de-energized and adjusts the operating speed of all remaining operating compressors when a compressor is de-energized.

The invention provides a control method and system of a compressor electric heating band in an air conditioner, wherein the control method comprises the following steps of: detecting the air exhaust temperature of a compressor or the outdoor environment temperature of the air conditioner when the air conditioner is at the standby condition, and comparing the detection temperature value and the setting value, and controlling the starting and closing of the compressor electric heating band under the standby condition according to the compared result. The control system comprises a first sensor, a second sensor, a first control module, a comparison module and a relay, wherein the first sensor detects the outdoor environment temperature; the second sensor detects the compressor air exhaust temperature; the first control module enables the first or the second sensor to operate in the standby state of the compressor, and is respectively connected with the first sensor and the second sensor electrically; the comparison module is used for comparing the detection value and the setting of the first or the second sensor, and is electrically connected with signal output ends of the first sensor and the second sensor; and the relay controls the starting and closing of the electric heating band, an input end of the relay is electrically connected with a signal output end of the comparison module, and an output end of the relay is electrically connected with the electric heating band. According to the invention, the standby power consumption of the air conditioner can be lowered.

A motor. The motor includes a stator, a rotor, a top magnetic structure, and a bottom magnetic structure. The stator is disposed in a frame. The rotor is also disposed in the frame, corresponding to the stator. The rotor comprises a shaft, extended axially from the rotor. The shaft does not contact the stator or the frame. The bottom magnetic structure is at the bottom of the frame. The top magnetic structure is on the top of the frame. The top and bottom magnetic structures are opposite to each other in an axial direction. Magnetic attraction generated between the first magnetic structure and the second magnetic structure attracts and positions the shaft therebetween such that the first magnetic structure, the second magnetic structure, and the shaft are coaxially aligned.

The present invention provides a linear compressor, including: a cylinder having a compression space of refrigerant therein; a piston linearly reciprocated inside the cylinder in an axis direction to compress the refrigerant; and a frame having a mounting hole so that one end of the cylinder can be mounted thereon, and also having a deformation prevention portion in some section around the mounting hole brought into contact with the one end of the cylinder. Even though the size of the cylinder is increased and the size of the frame is limited, the frame is provided with enough strength to support the cylinder, thereby reducing fastening deformations and improving operation reliability.

Devices, methods and systems for low volume microarray processing are disclosed. The microarray devices preferably include a plurality of reactant sites on a reactant surface. The reactant sites include reactants that operate to capture one or more selected analytes that can then be detected based on an electromagnetic signal, e.g., fluorescence, that is emitted by each analyte in response to excitation energy incident on the microarray device. Mixing and/or distribution of the analyte sample over the reactant surface is accomplished by tilting the reactant surface such that the analyte sample flows over the reactant surface under the force of gravity. The tilting is performed such that a portion of the analyte sample accumulates in a bead along a first edge of the reactant surface. The reactant surface is then tilted in a different direction such that a portion of the analyte sample flows over the reactant surface and accumulates at a second edge. The reactant surface preferably generates sufficient capillary forces with the analyte sample such that the analyte sample is retained on the reactant surface. The tilting and resultant flow may be performed as many times as necessary to obtain the desired mixing and/or distribution of analyte sample over the reactant surface.

An apparatus for controlling an operation of compressors includes a single microcomputer for calculating stroke estimate values of multiple compressors based on voltage and current values applied to the multiple compressors, and generating a plurality of switching control signals for independently controlling a voltage applied to the multiple compressors based on the calculated stroke estimate values and pre-set stroke reference values; and switching devices each installed in the multiple compressors, for independently controlling the voltage applied to the multiple compressors according to the plurality of switching control signals. Since the reciprocating compressors are controlled by a single apparatus, costs and power consumption can be reduced.

A hermetic compressor comprises a hermetic container, an electric motor and a compressing mechanism installed inside of the hermetic container, lubricating oil and refrigerant gas enclosed within the hermetic container, a first temperature detector disposed to a predetermined location within the hermetic container, and a second temperature detector disposed to a location adjacent to a surface of the lubricating oil in the hermetic container. The predetermined location where the first temperature detector is disposed is one of a location near an upper end and another location near a lower end within a space inside the hermetic container, and an amount of the lubricating oil in the hermetic container is determined according to temperatures detected by the first temperature detector and the second temperature detector.

The automatic oil level balancing and compensating device for refrigerating compressor includes one replenishing oil box with a connected gas pipe, the first solenoid valve and one exhaust valve; and one replenishing oil pipe and one second solenoid valve connected via a connecting oil pipe to the bottom of the crankshaft box in the compressor. The gas pipe has the outer end connected to the upper part of crankshaft box in the compressor and located over the oil level line of the crankshaft box, and the inner end in the lower part of replenishing oil box and with height determining the absolute height of the oil level inside the crankshaft box. Two solenoid valves are controlled by the controller for simultaneous opening or closing. The present invention can balance and compensate the oil level inside the crankshaft box of compressor automatically, and is suitable for single compressor or united compressors.

The embodiments described herein include a control system and method for a compressor that is operable with a climate system. The control system enables optimal climate system operation by efficiently controlling the operating speed of the compressor.

A compressor output calculation unit having a variable displacement compressor, a condenser, a pressure reducing mechanism and an evaporator, wherein a compressor torque or power is calculated based on a detected or estimated value of a refrigerant flow rate, a detected or estimated value of a refrigerant discharge pressure, a detected or estimated value of a refrigerant suction pressure, and a compressor rotational speed, and a control unit using the same. The compressor torque or power may be estimated at a high accuracy without using a refrigerant flow sensor.

A method of and device for detecting a leak in reciprocating machinery, comprising at least two pistons, by the volume flow at least out of the reciprocating machinery being monitored and analysed, e.g. by means of Fourier analysis, in order to make it possible to detect a flow component, where the flow component has a frequency that differs from the fundamental frequency of the reciprocating machinery, the fundamental frequency of the reciprocating machinery being constituted by the rotational frequency of the reciprocating machinery multiplied by the number of pistons in the reciprocating machinery.

The invention provides a pneumatic type cushion body device. The pneumatic type cushion body device comprises a controller and at least one fluctuating unit group, wherein the surface of the at leastone fluctuating unit group can form the overlapped fluctuating state; the at least one fluctuating unit group comprises at least one first air bag, at least one second air bag, a first air pump and asecond air pump; the controller is used for controlling the first air pump and the second air pump to work alternately; when the first air pump works, air can be extracted from the inflated second airbag for inflating the first air bag under the to-be-inflated state, so that the first air bag and the second air bag form the first fluctuating state within the work time of the first air pump; whenthe second air pump works, air can be extracted from the inflated first air bag for inflating the second air bag under the to-be-inflated state, so that the first air bag and the second air bag form the second fluctuating state within the work time of the second air pump; the alternating work of the first air pump and the second air pump enables the first air bag and the second air bag to performalternating fluctuating, so that the surface of the fluctuating unit group forms the overlapped fluctuating state.

The invention provides a pneumatic two-fluid grouting pump, and belongs to the technical field of electromechanical engineering equipment. The pneumatic two-fluid grouting pump is characterized in that a filter is connected with an air inlet ball valve which is connected with an air motor, the air motor is connected with a piston plate, the piston plate is connected with more than two pistons, the air motor is arranged on a piston frame, all the pistons are connected in plunger pump bodies, the plunger pump bodies are arranged on the piston frame and correspond to the pistons, elbows are arranged at the liquid absorption ends of t plunger pumps, the pump liquid ends of the plunger pumps are connected with a four-way pipe, a shock-proof pressure gage and the ball valve are connected to the four-way pipe respectively, a left high pressure hose and a right high pressure hose are connected to a Y-shaped three-way pipe which is further connected with a mixing pipe, and the mixing pipe is connected with an injection pipe. The pneumatic grouting pump is fully pneumatic, and single liquid grouting and two-fluid grouting can be conducted. The pneumatic two-fluid grouting pump is adjustable in pressure, simple in structure, stable and reliable in performance, long in service life, small in size, light in weight, flexible, reliable, wide in application range, convenient to move and transport, and suitable for frequently-moved multi-point grouting operation.

A bike repair stand includes a stand column, a leg mechanism including a slider, two first links, and two second links. The slider is able to slide on the stand column. Each of the two first links is pivotally joined to the slider and has an end adapted to abut the ground. Each of the two second links is pivotally joined to the stand column and one of the first links. A head seat is located on the stand column. A support mechanism includes a pole and two support levers. The pole is able to slide on the head seat. The two support levers are respectively fixed to two ends of an axle. The two support levers are pivotal with respect to the pole about the axle.

A system for controlling solids within a wellbore of a well includes a pump positioned within a substantially horizontal portion of the wellbore. A first tubing string is operatively connected between the pump and a surface of the well for removing liquid from the wellbore that is pumped by the pump. A second tubing string may also be operatively connected to the pump and extends downhole of the pump. Either or both of the first and second tubing string includes a longitudinal axis that is offset from an axis of rotation about which the second tubing string is capable of being rotated.

A method of surge protection for a dynamic compressor that has a corresponding compressor map. A control system continually calculates an equivalent polytropic head parameter in order to define a surge limit line. The system then calculates a control parameter and determines the distance the control parameter to the surge limit line wherein the control parameter is dynamic to changes in compressor load and invariant to changes in suction conditions and gas compressibility. As a result of the distance of the control parameter to the surge limit line, the surge valve of a dynamic compressor is actuated to prevent surge.

The invention relates to a novel anti-eccentric wear hydraulic oil extraction device which comprises surface power equipment and underground produced liquid equipment. The surface power equipment comprises a power liquid storage tank, a plunger pump, an energy accumulator and a reversing valve; the underground produced liquid equipment comprises a power liquid pipeline, a power pump and a produced liquid oil tube, the lower portion of the power liquid pipeline is connected with a power pump piston, the lower portion of the produced liquid oil tube is connected with an oil extraction pump pump-cylinder, the oil extraction pump pump-cylinder is internally provided with an oil extraction pump plunger which is internally provided with a traveling valve, the lower portion of the oil extraction pump pump-cylinder is connected with an underground oil tube, a standing valve is arranged on the position where the underground oil tube and the oil extraction pump pump-cylinder are connected, and a produced liquid storage cavity is formed between the oil extraction pump plunger and the standing valve; a power pump cylinder barrel is connected with the oil extraction pump plunger through a weighing rod in an up and down mode; a produced liquid outlet is formed in the upper end of the produced liquid oil tube. Power liquid and produced fluid are isolated all the time, and huge equipment on the ground is removed; the reversing valve is arranged on the ground, the underground structure is simple and reliable, and operation is convenient; meanwhile, the problem that the service life of underground equipment is short is solved.

The spring type Y-shaped well joint includes an oil producing and well testing channel, a well testing channel and an oil pumping electric pump channel forming a Y-shaped structure. In the joint between the oil pumping electric pump channel and the well testing channel, there is one sealing device, which seals the well testing channel while opening the oil pumping electric pump channel when the oil well is in its production state, and seals the oil pumping electric pump channel while opening the well testing channel when the oil well is in its production stopping state. The present invention is superior to available technology, and has simplified operation process.

The present invention relates to methods, devices and systems for performing the removal of thrombus from a vessel lumen. More particularly the present invention relates to a thrombectomy system that includes an elongate catheter and a disposable aspiration pump and methods of performing medical procedures to remove clots, thrombus and emboli to re-establish the normal intravascular flow of blood.

A dispensing apparatus is proposed for a fluid having a supply tank (2) for the fluid which has an outlet (4) which can be connected to a pressure line (5) for the fluid (F), and having a rotary pump (3) which has a rotor (31) for conveying the fluid (F) into the pressure line, with the rotor (31) for the mixing of the fluid being arranged directly in the outlet (4) of the supply tank (2).