According to some embodiments, an apparatus comprises an air pump configured to couple to a capstan, and a pneumatic cylinder coupled to the air pump at a first end of the pneumatic cylinder. The pneumatic cylinder comprises a piston. Rotation of the capstan in a first rotational direction causes the air pump to provide air pressure to the first end of the pneumatic cylinder. In response to the air pump providing air pressure to the first end of the pneumatic cylinder, the piston of the pneumatic cylinder moves in a first linear direction. The piston is coupled to a longitudinal beam of a longitudinal door system of a railcar. In response to the piston moving in the first linear direction, the longitudinal beam moves in the first linear direction, opening a door of the longitudinal door system.

A hub-integrated inflation system which functions to convert relative motion at the wheel end (e.g., between the axle and the hub or wheel) into a pumping motion. The relative motion is then converted into mechanical or electrical energy, which can be used to actuate a pump of an inflator.

A hub-integrated inflation system which functions to convert relative motion at the wheel end (e.g., between the axle and the hub or wheel) into a pumping motion. The relative motion is then converted into mechanical or electrical energy, which can be used to actuate a pump of an inflator.

An air compressor improves the dustproof performance of an intake path to a crankcase. The air compressor includes a compression assembly that reciprocates a piston in a cylinder to produce compressed air, a crankcase accommodating the compression assembly and having an inner inlet to allow outside air to be drawn, a filter located in the crankcase and covering the inner inlet from outside, a filter cover having an outer inlet and covering the filter from outside, and a dust cover covering the filter cover from outside, covering the outer inlet, and including an outer circumferential portion. The outer circumference portion and the filter cover have a space to draw outside air between the outer circumference portion and the filter cover.

Systems are provided for an air compressor system. In one example, a system includes a housing, a piston arranged in the housing, and a crankshaft arranged in the housing, the crankshaft coupled to a connecting rod of the piston, and the crankshaft forces the piston to oscillate from a first end of the housing to a second end, the piston pressurizing air in the housing to a first pressure at the first end and to a second pressure at the second end, the second pressure greater than the first.

A reciprocating compressor-expander according to the present invention comprises a cylinder, a piston, a crankshaft connected to the piston, a first valve for a low pressure compressible fluid, a second valve for a high pressure compressible fluid, and a valve drive mechanism for driving the first valve and the second respectively such that, during a compression process, the low-pressure compressible fluid is sucked into the cylinder from the first valve in synchronization with the rotation of the crankshaft and the high-pressure compressible fluid compressed in the cylinder is discharged from the second valve, and that, during an expansion process, the high-pressure compressive fluid is introduced from the second valve into the cylinder, and the low-pressure compressible fluid expanded in the cylinder is discharged from the first valve.

The present invention discloses an energy-saving one-dimensional compressor, comprising an air compressor, a fixing rod, a bearing plate, a condensing tube and a driving device. The air compressor comprises an inner shell and an outer shell; the inner shell comprises an upper pressing plate and a cylindrical plate; a top of the cylindrical plate is fixed under the upper pressing plate; an air inlet is formed at an upper part of the outer shell; part of a bottom of the outer shell protrudes downwards to form a cylindrical plate slot corresponding to the cylindrical plate; and the cylindrical plate can move up and down in the cylindrical plate slot. An air outlet is also formed at the bottom of the outer shell. The present invention has the beneficial effects of simple structure and high energy utilization rate.

A system includes a reciprocating expander including: a piston disposed in a chamber; a crankshaft; a connector rod coupled between the piston and the crankshaft and configured to transfer torque to the crankshaft in response to movement of the piston in the chamber; and a fluid inlet and a fluid outlet on one side of the piston. The system also includes a first flowpath coupled between a wellbore and the reciprocating expander and configured to communicate gas from the wellbore into the fluid inlet of the reciprocating expander at a first pressure. The system further includes a second flowpath coupled between the reciprocating expander and downstream equipment and configured to communicate the gas from the reciprocating expander toward the downstream equipment at a second pressure, the second pressure being lower than the first pressure.

A system includes a reciprocating expander including: a piston disposed in a chamber; a crankshaft; a connector rod coupled between the piston and the crankshaft and configured to transfer torque to the crankshaft in response to movement of the piston in the chamber; and a fluid inlet and a fluid outlet on one side of the piston. The system also includes a first flowpath coupled between a wellbore and the reciprocating expander and configured to communicate gas from the wellbore into the fluid inlet of the reciprocating expander at a first pressure. The system further includes a second flowpath coupled between the reciprocating expander and downstream equipment and configured to communicate the gas from the reciprocating expander toward the downstream equipment at a second pressure, the second pressure being lower than the first pressure.

A device (10) for providing air under pressure to a rotating pneumatic tire is disclosed. The device comprises a pump (48, 50, 58) which in use rotates with the tire and which provides air under pressure to the tire when the pump is activated. There is a pump drive system for activating the pump upon a loss of pressure in the tire. The pump drive system includes a connecting rod (52) which is rotationally connected to the tire and an eccentric body (32) which rotates with the rod when the pump is inactive. The eccentric body is inhibited from rotating with the rod to activate the pump. Relative rotation between the rod and the eccentric body drives the pump to provide air under pressure to the tire. An electromagnetic clutch is provided which has a first plate (26) which is non-rotatable and a second plate (36) which rotates with the body. The first plate is connected to the second plate electromagnetically when the clutch is engaged to prevent rotation of the second plate and hence of the connecting rod.