A machine for dispensing beverages includes a pod including at least two cavities each cavity containing a volume of ingredients forming part of a composition of the beverage, the machine further including an air injection device configured to supply at least two volumes of air in a synchronized manner, the at least two volumes of air being adapted respectively to the volumes of ingredients in the at least two cavities, the injection device including an air pump including two chambers and two pistons slidably mounted respectively in the two chambers, and an actuator configured to actuate the two pistons in a synchronized manner.

A rapidly modulated hydraulic supply is disclosed. The rapidly modulated hydraulic supply can include a chamber for receiving fluid. The rapidly modulated hydraulic supply can also include a displacement member operable to displace the fluid from the chamber. In addition, the rapidly modulated hydraulic supply can include a flow modulation system operable to vary the flow rate of the fluid output from the chamber. A first flow rate corresponds to a first output pressure, and is different from a second flow rate corresponding to a second output pressure for a like movement of the displacement member.

There is described a patch pump comprising a cartridge, a power source, a pump system, a drug delivery device and a control system configured to operate in particular the pump system and the drug delivery device. The pump system comprises, on the one hand, a pump having a pump housing containing a pump piston and a valve piston and, on the other hand, a pump drive comprising a piston motor and a valve motor for driving the pump piston and the valve piston independently from each other through a first and a second transmission. The drug delivery device comprises a transdermal delivery system having a needle actuation mechanism configured for transdermal insertion of a cannula.

The invention relates to an expansion unit for installation in a refrigerant circuit, including an expansion system having an subcooling unit for subcooling a mass flow of a refrigerant that is supplied to the expansion unit, having an expansion/compression unit including an expander stage and a compressor stage, having a branching point that splits off a subcooling mass flow from a total mass flow supplied to the expansion unit and that is connected to a supply conduit that guides the subcooling mass flow to an inlet of the subcooling unit, having an expansion member that expands the subcooling mass flow to a subcooling pressure, having a connection conduit that supplies the subcooling mass flow exiting from the subcooling unit to the compression stage, which for its part compresses the subcooling mass flow to a return high pressure, and having an electrically operated controller that detects an ambient temperature and/or a temperature of the mass flow of refrigerant that is supplied to the expansion unit and/or the expander stage, and in accordance with this temperature adjusts an inlet pressure of the expansion unit or the expansion/compression unit by controlling the subcooling mass flow using the expansion member that is electrically controlled by the controller.

A reciprocating-type piston compressor that can operate at very low speed (<300 rpm) with the ability to pump liquids. It can be configured with one or more double-acting cylinders. A variable speed drive can be used to adjust the operating speed of the compressor to control system torque requirements throughout the compression cycle.

A variable displacement hydraulic device comprising: a housing having an inlet for receiving hydraulic fluid and an outlet for outputting the hydraulic fluid, the housing having a reciprocation axis; a first cylinder positioned in the housing along the reciprocation axis, the first cylinder having a first input for receiving the hydraulic fluid on a first intake stroke and a first output for ejecting the hydraulic fluid on a first exhaust stroke; a first piston positioned for a first reciprocal motion within the first cylinder, the first piston having a first main end exposed to the hydraulic fluid and a second main end coupled to an actuator, the actuator for driving the second main end when coupled to the actuator for causing the first reciprocal motion to induce a first portion of said outputting of the hydraulic fluid; a second cylinder positioned in the first piston along the reciprocation axis, the second cylinder having a second input for receiving the hydraulic fluid on a second intake stroke and a second output for ejecting the hydraulic fluid on a second exhaust stroke; a second piston positioned for a second reciprocal motion within the second cylinder, the second piston having a first secondary end exposed to the hydraulic fluid and a second secondary end coupled to the actuator, the actuator for driving the second secondary end when coupled to the actuator for causing the second reciprocal motion to induce a second portion of said outputting of the hydraulic fluid; and a locking mechanism for inhibiting the first reciprocal motion of the first piston; wherein when engaged the locking mechanism inhibits the first portion of said outputting of the hydraulic fluid by decoupling the first piston from the actuator while continued operation of the actuator provides the second portion of said outputting of the hydraulic fluid by the second piston.

A linear compressor is provided that may include a cylinder, to which a discharge valve may be coupled; a first piston, which may be provided to enable a reciprocating motion in an inside of the cylinder; a second piston, which may be provided to enable a reciprocating motion in an inside of the first piston; a first compression chamber formed between the discharge valve and the first piston; and a second compression chamber formed between the first piston and the second piston. The first piston and second piston may move in opposite directions with respect to each other.

The invention relates to an apparatus for compressing cryogenic fluid, comprising a sealed enclosure intended to contain a bath of cryogenic fluid, a compression chamber communicating with the bath, an intake system communicating with the compression chamber and configured to allow the inlet of fluid to be compressed into the compression chamber, and a mobile piston for compressing the fluid in the compression chamber, the apparatus also comprising an evacuation system communicating with the compression chamber and configured to allow the outlet of compressed fluid, the piston being mounted at a first end of a rod, the apparatus comprising a mechanism for driving the rod in a back and forth movement along a longitudinal direction, the drive mechanism comprising a motor provided with a rotating shaft and a mechanical system converting the rotary movement of the rotating shaft into a movement in translation of a head sliding along the longitudinal direction and to which a second end of the rod is connected, characterized in that the head is mounted so as to slide and to be guided by two fixed guide rails situated on either side of the head, and in that the head and/or one rail comprises a resilient portion, the resilient portion being configured to generate, on the rail or rails, a force transverse to the longitudinal direction.

A machine for dispensing beverages includes a pod including at least two cavities each cavity containing a volume of ingredients forming part of a composition of the beverage, the machine further including an air injection device configured to supply at least two volumes of air in a synchronized manner, the at least two volumes of air being adapted respectively to the volumes of ingredients in the at least two cavities, the injection device including an air pump including two chambers and two pistons slidably mounted respectively in the two chambers, and an actuator configured to actuate the two pistons in a synchronized manner.

A turn-back coaxial gas pressurizing pump and gas pressurizing method using the same, relate to the field of gas pressure boosting. The turn-back coaxial gas pressurizing pump includes a primary cylinder, a primary piston, a secondary cylinder serving as a rod of the primary piston, a pressure bar, an air pump bonnet, a secondary piston and a piston rod. The primary cylinder, the secondary cylinder and the piston rod are arranged coaxially. A rear end of the piston rod extends through a first non-returning adaptive valve provided in the primary piston and is fixed on the bottom wall of the primary cylinder. As a result, the two pistons move in opposite directions to boost the pressure.