Abstract:
A linear compressor (100) is provided. The linear compressor (100) includes an electro-magnetic spring (150) and a casing (110) that defines a chamber (112). A piston (120) is received within the chamber (1 12) of the casing (110). The electro-magnetic spring (150) can apply a non-linear force to the piston (120) such that a total spring force applied to the piston (120) during a compression stroke is substantially linear.
Abstract:
The present invention relates to an actuation system for a resonant linear compressor (50), applied to cooling systems, the latter being particularly designed to operate at the electromechanical frequency of said compressor (50), so that the system will be capable of raising the maximum power supplied by the linear actuator, in conditions of overload of said cooling system. Additionally, the present invention relates to an actuation method for a resonant linear compressor (50), the operation steps of which enable one to actuate the equipment at the electromechanical resonance frequency, as well as to control the actuation thereof in over load conditions.
Abstract:
The present invention relates to an actuation system for a resonant linear compressor (50), applied to cooling systems, the latter being particularly designed to operate at the electromechanical frequency of said compressor (50), so that the system will be capable of raising the maximum power supplied by the linear actuator, in conditions of overload of said cooling system. Additionally, the present invention relates to an actuation method for a resonant linear compressor (50), the operation steps of which enable one to actuate the equipment at the electromechanical resonance frequency, as well as to control the actuation thereof in overload conditions.
Abstract:
The present invention relates to a system and method for controlling the piston of a resonant linear compressor (100) especially designed to operate with maximum efficiency, wherein the system can actuate the compressor without using sensors for measuring mechanical values or variables. The present invention further relates to a method for controlling a resonant linear compressor piston, the method comprising steps that make it possible to evaluate piston speed and displacement in order to control the compressor motor in an efficient manner. In addition, the present invention relates to a resonant linear compressor (100) provided with the claimed control system.
Abstract:
Pumping unit (10) for a machine to distribute concrete comprising: a pair of pistons (12, 13) provided with a relative pumping cylinder (22, 23) movable linearly for a determinate travel (S) to feed the concrete to a determinate circuit to distribute the concrete; and a hydraulic command circuit (11) operatively connected to both the pistons (12, 13), to determine an alternate pumping movement of the relative pumping cylinders (22, 23). The pumping unit (10) comprises at least a sensor member (15) operatively associated to at least one of the pistons (12, 13) in order to detect point-by -point one or more data relating to the operating condition of the pumping cylinder (22, 23) during its movement for the whole travel (S). The data comprise at least one of position, speed, stress and direction of movement of the relative piston (12, 13).
Abstract:
A method for increasing compressed air efficiency in a pump utilizes an air efficiency device in order to optimize the amount of a compressed air in a pump. The air efficiency device may allow for controlling the operation of the air operated diaphragm pump by reducing the flow of compressed air supplied to the pump as the pump moves between first and second diaphragm positions. A sensor may be used to monitor velocity of the diaphragm assemblies. In turn, full position feedback is possible so that the pump self adjusts to determine the optimum, or close to optimum, turndown point of the diaphragm assemblies. As such, air savings is achieved by minimizing the amount of required compressed air.
Abstract:
A composition dosing device for agricultural sprayers intended to spray plant nutrients as well as pesticidal control agents to control insects, fungi or weed harmful to cultivated crops and thus not desirable, comprising at least one container for active and concentrated substance and a piston pump for the container or containers of for each container as well as a control means for adjusting the pump flow/flows admixed with a flow of pure water from a water tank. The dosing pump or each dosing pump is preferably at least of the two-piston type, in which the reciprocal movement of the respective pistons (21) is positively controlled by means of a double-acting fluid control cylinder (4) such that when one piston (21) performs a pump stroke, the other performs a suction stroke.
Abstract:
An implantable blood pump actuator (1) uses an efficient direct drive voice coil linear motor (2) to power an hydraulic piston (7). The motor is immersed in oil (12) and has but one moving part, a magnet (3) which is attached to the piston. The piston is supported using a linear double acting hydrodynamic oil bearing (8) that eliminates all wear and will potentially give an infinitely long life. There are no flexing leads, or springs to break or parts to fatigue. A total artificial heart embodiment is very light, small, and as efficient as present prosthesis. The motor uses two commutated coils (13, 13a; 4, 5; 4a, 5a) for high efficiency and has inherently low side forces due to the use of coils on both the inside and outside diameters of the magnet. The motor is cooled by forced convection of oil from the piston motion and by direct immersion of the coils in the oil. This highly effective cooling results in a smaller, lighter weight motor.
Abstract in simplified Chinese:液体加压设备中,具备:柱塞泵1;压力传感器23;及,移动柱塞5A、5B到达预先设置有效吐出压力值之临界值,有效吐出压力值于到达临界值后进行有效吐出压力值的控制以决定最佳发送速度,随后维持一定之该等最佳发送速度的压力控制部25。又,让压力控制部25具有比例要素使有效吐出压力值到达临界值之后,最初到达柱塞5A、5B的前进端为止之间,比例控制有效吐出压力值。
Abstract:
[Problems] To provide a driving method for a metering pump, a driving apparatus for a metering pump, a vaporizer and an anesthesia apparatus which are capable of suppressing a pulsation in the metering pump, and lowering the costs and reducing the sizes of the vaporizer and the anesthesia apparatus. [Means for solving the Problems] A metering pump 16 is joined to the stepping motor 15, includes an eccentric mechanism converting a revolving motion of the stepping motor 15 into a reciprocating motion of a plunger 16A, and makes a constant liquid delivery by sucking and discharging an anesthetic agent through variations in the cubic volume of a cylinder 16D caused by the reciprocating motion of the plunger 16A. The control section 12: calculates a suction and discharge cycle T of the metering pump 16 on the basis of a set anesthetic-gas concentration and a fresh-gas flow rate; sets a discharge period T2 of the cycle T to be longer than a suction period T1 of the cycle T; and controls the revolution speed of the stepping motor 15 so that the travelling speed of the plunger 16A is kept constant during the discharge period T2.