A piston of an air compressor is actuated by a motor to move in a cylinder. The piston includes a head, an air stop sheet having a first bending section which is a boundary line of an acting area and a positioning zone of the air stop sheet, and a back surface of the acting zone backing the top of the cylinder bends relative to a plane of a top of the head at an open angle. The acting zone has a noncircular spacing groove, a neck, and a second bending section. The head includes a piston rod having a cavity, an air conduit, a column, and a spring. The air stop sheet is forced by the spring to locate in the acting zone backing the cylinder and a plane of a top of the head at an open angle.

The present invention discloses a fast inflating air pump, including a housing, an inflating tube, an inlet tube, a motor, a transmission assembly and a controller housed in the housing. A blower is arranged in the inlet tube for increasing air pressure to the inflating port. A piston is at least partially contained in the inflating tube, and the piston is driven by the motor via the transmission assembly so as to slide back and forth linearly for increasing air pressure in the inflating tube. A one-way valve is installed in the communicating pipe for only allowing air flow into the inflating tube. The controller instructs the motor to drive the piston to slide back and forth in the inflation tube on condition that the blower stops working until the air inflation pressure increases to a predetermined threshold, then the controller instructs the motor to stop operating.

A mortise-tenon jointed air pump has a holding base, an inflation cylinder assembly, an inflation connector assembly, and an air pressure gauge. The holding base has a hollow housing. The inflation cylinder assembly is connected to an inlet end of the housing. The inflation connector assembly is mounted in an exhaust opening of the housing. The air pressure gauge is mounted in a pressure sensing portion of the holding base. The housing of the holding base and a connector of the inflation cylinder assembly are connected with each other by engaging at least one engaging protrusion in at least one engaging groove. Moreover, by inserting at least one retaining block through the housing and the connector, a relative position of the connector and the holding base is locked.

A piston compressor includes a crankcase (11), a crankshaft (12), connecting rods (13), a crosshead (14) with an arranged piston rod (15) and a piston (16), dry-running guided in a cylinder (17). Valves (18) are provided. A piston rod sealing device (19), around the piston rod between the cylinder (17) and the crankcase, includes a gland device (22), arranged in a gland housing (21), inserted into a piston compressor housing (20). The gland device includes a gland jacket (24) pushed into a gland (23) limiting, with the piston rod, a sealing gap (25), which is open over a common longitudinal section, has a width in the .Math.m range and allows a leakage flow (26) of the compressed medium therethrough. The gland and the gland jacket are formed of different materials with a resulting coefficient of thermal expansion essentially the same as the material of the piston rod.

Hybrid thermodynamic compressor (8) for compressing a working fluid, the compressor comprising a volumetric cylinder (1) and a thermal cylinder (2) connected to one another mechanically by a connecting rod system (5) and pneumatically by a connecting circuit (12) optionally with a valve (4), a reversible electric machine (6), the volumetric cylinder comprising a first piston (81) that separates a first chamber (Ch1) from a second chamber (Ch2), the thermal cylinder comprising a second piston (82) which separates a third chamber (Ch3) from a fourth chamber (Ch4), which can be brought into thermal contact with a heat source (21) to thereby generate a cycled movement in the thermal cylinder, and concerning the connecting rod system (5), the first and second pistons are connected to a rotor (52) by first and second respective connecting rods (91,92), with a predetermined angular offset (θd), the volumetric cylinder being equipped with non-return valves (61,62), the power produced in the thermal cylinder being transmitted to the volumetric cylinder essentially via the connecting circuit and not via the rod system.

The reciprocating compressor has a cylinder with a compression chamber where a piston can slide between a crank-side position and a head-side position; a piston rod is mechanically connected to the piston and during operation of the compressor, slides in a hole of the compression chamber; there is a small gap between the hole and the piston rod; in order to avoid leakage from this gap a jacket is arranged around the piston rod and is sealed on one side to the piston and on the other side to the cylinder at the gap.

The packing seal for a piston compressor, having a longitudinal axis L as well as, following one after the other in the direction of the longitudinal axis L, a fastening part and a cylindrical part, wherein a magnetic bearing and at least one chamber ring with a sealing ring arranged therein are arranged following one after the other in the direction of the longitudinal axis L in the cylindrical part, wherein the magnetic bearing includes at least one controllable electromagnet.

A diaphragm pump having a crankshaft that is rotatable about a rotational axis and coupled to a piston. The piston is reciprocally displaceable within a piston cylinder along an axis of motion between suction and discharge strokes. A diaphragm housing coupled to the piston cylinder at least partially defines a pumping chamber through which fluid is pumped as the piston reciprocates. The axis of motion, which intersects a connection between the piston and the connecting rod, may not intersect the rotational axis of the crankshaft such that, relative to an arrangement in which the axis of motion does intersect the rotational axis, a peak magnitude of piston side load forces during the discharge stroke is reduced and a peak magnitude of piston side load forces during the suction stroke is increased so as to attain an improved balance between the peak magnitudes of piston side load forces of the discharge and suction strokes.

A diaphragm pump having a crankshaft that is rotatable about a rotational axis and coupled to a piston. The piston is reciprocally displaceable within a piston cylinder along an axis of motion between suction and discharge strokes. A diaphragm housing coupled to the piston cylinder at least partially defines a pumping chamber through which fluid is pumped as the piston reciprocates. The axis of motion, which intersects a connection between the piston and the connecting rod, may not intersect the rotational axis of the crankshaft such that, relative to an arrangement in which the axis of motion does intersect the rotational axis, a peak magnitude of piston side load forces during the discharge stroke is reduced and a peak magnitude of piston side load forces during the suction stroke is increased so as to attain an improved balance between the peak magnitudes of piston side load forces of the discharge and suction strokes.

A compressor is disclosed. The compressor compressing and discharging a refrigerant sucked into a cylinder includes a cylinder forming a compression space of the refrigerant and having a cylindrical shape; a piston configured to reciprocate in the cylinder along an axial direction and having a cylindrical shape; a suction valve disposed at a front of the piston; a plate disposed in a rear of the piston, the plate comprising a flow groove into which the refrigerant is sucked; and a rod extending along the axial direction, one end of the rod being disposed on the suction valve, and other end of the rod being disposed on the plate.