A compressor according to an embodiment includes: a discharge valve; a discharge space formed downstream of the discharge valve; a liquid injection hole for injecting a refrigerant liquid into the discharge space; and a heat medium flow path located opposite to the discharge space across a partition wall forming the discharge space.

A compressor according to an embodiment includes: a discharge valve; a discharge space formed downstream of the discharge valve; a liquid injection hole for injecting a refrigerant liquid into the discharge space; and a heat medium flow path located opposite to the discharge space across a partition wall forming the discharge space.

A fluid dispenser for dispensing small doses of fluid includes a dispenser housing, a diaphragm assembly, a displacement chamber, and a dispensing luer. The dispenser housing has a first end for receiving the fluid and a second end for dispensing the fluid. The dispenser housing defines a fluid flow path from a receiving chamber adjacent the first end to a dispensing chamber adjacent the second end. The diaphragm assembly includes a first diaphragm within the receiving chamber and a second diaphragm within the dispensing chamber wherein the first diaphragm is operably connected to the second diaphragm. The diaphragm assembly is movable between a first position wherein the first diaphragm moves the fluid from the receiving chamber to the dispensing chamber along the fluid flow path and a second position wherein the second diaphragm moves the fluid from the dispensing chamber to the displacement chamber.

A fluid dispenser for dispensing small doses of fluid includes a dispenser housing, a diaphragm assembly, a displacement chamber, and a dispensing luer. The dispenser housing has a first end for receiving the fluid and a second end for dispensing the fluid. The dispenser housing defines a fluid flow path from a receiving chamber adjacent the first end to a dispensing chamber adjacent the second end. The diaphragm assembly includes a first diaphragm within the receiving chamber and a second diaphragm within the dispensing chamber wherein the first diaphragm is operably connected to the second diaphragm. The diaphragm assembly is movable between a first position wherein the first diaphragm moves the fluid from the receiving chamber to the dispensing chamber along the fluid flow path and a second position wherein the second diaphragm moves the fluid from the dispensing chamber to the displacement chamber.

The present disclosure relates to a technical field of fluid delivering. An electromagnetic pump is provided. The electromagnetic pump includes a drive mechanism and a magnetic assembly, where the magnetic assembly is configured to be driven by the drive mechanism to generate a varying magnetic field.

A structural reinforcement and biocompatible pump head for a pump includes a reinforcement structure having a plurality of ports and fluid pathways therein. The fluid pathways in the reinforcement may be coated or lined with a biocompatible material to form a biocompatible pump head useful for liquid chromatography and other analytical instrument systems. The biocompatible material may be injection molded into the fluid pathways of the reinforcement structure and may be machined after core pins are removed to obtain a desired surface finish and/or size of the biocompatible fluid pathways of the pump head.

A structural reinforcement and biocompatible pump head for a pump includes a reinforcement structure having a plurality of ports and fluid pathways therein. The fluid pathways in the reinforcement may be coated or lined with a biocompatible material to form a biocompatible pump head useful for liquid chromatography and other analytical instrument systems. The biocompatible material may be injection molded into the fluid pathways of the reinforcement structure and may be machined after core pins are removed to obtain a desired surface finish and/or size of the biocompatible fluid pathways of the pump head.

A method and computer program product for defining a PWM drive signal having a defined voltage potential. The PWM drive signal has a plurality of “on” portions and a plurality of “off” portions that define a first duty cycle for regulating, at least in part, a flow rate of a pump assembly. At least a portion of the “on” portions of the PWM drive signal are pulse width modulated to define a second duty cycle for the at least a portion of the “on” portions of the PWM drive signal. The second duty cycle regulates, at least in part, the percentage of the defined voltage potential applied to the pump assembly.

A pump with an outer housing defining an enclosure, an inlet for admitting fluid into the outer housing and an outlet for expelling fluid from the outer housing, a piston for selectively modulating a first fluid pressure, such that the first fluid pressure is associated with a location proximate the inlet, and a member that selectively isolates a second pressure associated with a location proximate the outlet from the first fluid pressure. The pump may also include a first chamber within the outer housing for receiving fluid admitted into the pump from an ambient environment and through an inlet to the pump, a second chamber within the outer housing for receiving fluid from the first chamber, and a piston that both (i) selectively controls the flow of fluid from the first chamber to the second chamber and (ii) selectively expels the fluid from the second chamber into the ambient environment.

A pump with an outer housing defining an enclosure, an inlet for admitting fluid into the outer housing and an outlet for expelling fluid from the outer housing, a piston for selectively modulating a first fluid pressure, such that the first fluid pressure is associated with a location proximate the inlet, and a member that selectively isolates a second pressure associated with a location proximate the outlet from the first fluid pressure. The pump may also include a first chamber within the outer housing for receiving fluid admitted into the pump from an ambient environment and through an inlet to the pump, a second chamber within the outer housing for receiving fluid from the first chamber, and a piston that both (i) selectively controls the flow of fluid from the first chamber to the second chamber and (ii) selectively expels the fluid from the second chamber into the ambient environment.