An air sampling pump includes a reciprocating piston for operating a diaphragm assembly. The diaphragm includes a valve head including a fluid inlet and a fluid outlet and a fluid chamber defining a fluid path between the inlet and outlet. A diaphragm sealing engages the valve head and encloses the fluid chamber. The diaphragm includes a piston diaphragm membrane portion coupled to the piston for reciprocating with the piston and reciprocation of the piston causes a change in air pressure within the fluid chamber to cause air to move from the fluid inlet toward the fluid outlet. The diaphragm includes a damper membrane portion, which cooperate to reduce an amplitude of pulsation in the airflow at the fluid inlet and fluid outlet.

A nested gas charged cartridge for insertion in a cylinder to reduce pulsations in a fluid pumping system includes a first gas cartridge and a second gas cartridge, and optionally a third gas cartridge. Each of the first, second, and third gas cartridges independently and cumulatively reduce pulsations entering the cylinder. A diameter of the third gas cartridge is less than a diameter of the second gas cartridge, which both are less than a diameter of a first gas cartridge.

A miniature blower includes a soft sheet, a nozzle plate, a chamber frame, an actuator body, an insulation frame, and a conductive frame. The nozzle plate has a suspension portion, and the soft sheet is disposed on the suspension portion. The chamber frame is disposed on the nozzle plate. The actuator body includes a piezoelectric carrier plate, an adjusting resonance plate, and a piezoelectric plate. The actuator body is disposed on the chamber frame. The insulation frame is disposed on the actuator. The center point of a central hole of the soft sheet and the center point of a hollow hole of the suspension portion are located at the same axis.

A bead gasket for sealing off an axial joint between a first component and a second component, the bead gasket including a first bead loop surrounds a first inner region in an axial view and includes a bead end face for an axial contact with one of the components; a passage for fluid which is located in the first inner region, wherein the first bead loop is a smallest bead loop surrounding the passage; and a first rigidifying structure which extends from the first bead loop into the first inner region in the axial view in order to rigidify the first bead loop.

A compressor and a method of manufacturing the same are disclosed. The compressor includes a piston having formed therein a suction space, in which refrigerant gas is sucked; and a cylinder in which a piston is accommodated, the cylinder defining a compression space that is configured, based on the piston reciprocating in an axial direction, to compress the refrigerant gas therein. A plurality of grooves having a partial spherical shape and having a diameter of 10 micrometers is formed in an outer circumferential surface of the piston or an inner circumferential surface of the cylinder.

A pump mechanism for vacuum sealing an airtight cavity formed by a container and a lid, including a bore having a first one-way seal allowing air from the airtight cavity to enter the bore and blocking air inside the bore from returning to the airtight cavity and a second one-way seal allowing air inside the bore to leave the bore without returning to the airtight cavity and blocking air outside of the bore from entering the bore, a piston disposed inside the bore, and a chamber of air enclosed by the bore, the first and second one-way seals, and the piston, wherein actuation of the piston in a first direction causes air to evacuate the airtight cavity and enter the chamber through the first one-way seal, and wherein actuation of the piston in a second direction causes air to exit the chamber through the second one-way seal.

A replacement tube for a manifold is provided. The replacement tube includes a closed cell foam and a reinforcement strip. The closed cell foam is formed in a cylindrical tube and flexible to absorb pressure pulsations in a chamber of a suction manifold or in another device. The reinforcement strip is fixed along a length of the closed cell foam to support the closed cell foam from flexing and collapsing along the length of the closed cell foam.

A nested gas charged cartridge for insertion in a cylinder to reduce pulsations in a fluid pumping system includes a first gas cartridge and a second gas cartridge, and optionally a third gas cartridge. Each of the first, second, and third gas cartridges independently and cumulatively reduce pulsations entering the cylinder. A diameter of the third gas cartridge is less than a diameter of the second gas cartridge, which both are less than a diameter of a first gas cartridge.

An air sampling pump includes a reciprocating piston for operating a diaphragm assembly. The diaphragm includes a valve head including a fluid inlet and a fluid outlet and a fluid chamber defining a fluid path between the inlet and outlet. A diaphragm sealing engages the valve head and encloses the fluid chamber. The diaphragm includes a piston diaphragm membrane portion coupled to the piston for reciprocating with the piston and reciprocation of the piston causes a change in air pressure within the fluid chamber to cause air to move from the fluid inlet toward the fluid outlet. The diaphragm includes a damper membrane portion, which cooperate to reduce an amplitude of pulsation in the airflow at the fluid inlet and fluid outlet.

A pump mechanism for vacuum sealing an airtight cavity formed by a container and a lid, including a bore having a first one-way seal allowing air from the airtight cavity to enter the bore and blocking air inside the bore from returning to the airtight cavity and a second one-way seal allowing air inside the bore to leave the bore without returning to the airtight cavity and blocking air outside of the bore from entering the bore, a piston disposed inside the bore, and a chamber of air enclosed by the bore, the first and second one-way seals, and the piston, wherein actuation of the piston in a first direction causes air to evacuate the airtight cavity and enter the chamber through the first one-way seal, and wherein actuation of the piston in a second direction causes air to exit the chamber through the second one-way seal.