An expander and a fluid circulation system comprising same are disclosed. The expander comprises a housing, an expansion mechanism, an exhaust pipe, an oil sump and a lubricant discharge channel. The expansion mechanism is provided in the housing to expand a high-pressure fluid into a low-pressure fluid. The exhaust pipe discharges the low-pressure fluid out of the expander and comprises an end portion assembled in a first opening of the housing and provided with an exhaust port; the low-pressure fluid enters the exhaust pipe via the exhaust port. The oil sump stores a lubricant in the housing. The lubricant discharge channel discharges the lubricant in the oil sump into the exhaust pipe and/or an external system pipeline and comprises an inlet end having an inlet located at a predetermined oil level of the oil sump and an outlet end having an outlet.

A gas delivery augmenter may include a pump mechanism for facilitating inflation of an inflatable. The pump mechanism is generally configured to be driven/powered by pressure-volume energy from a primary gas received by the gas delivery augmenter, and the pump mechanism of the gas delivery augmenter is configured to entrain a secondary gas deliver the entrained secondary gas (and any remaining primary gas) to the inflatable. The pump mechanism, as described in greater detail below, enables secondary gas to be pumped/delivered to the inflatable even as the inflatable backpressure increases, thus providing improved inflation over conventional aspirators.

A gas delivery augmenter may include a pump mechanism for facilitating inflation of an inflatable. The pump mechanism is generally configured to be driven/powered by pressure-volume energy from a primary gas received by the gas delivery augmenter, and the pump mechanism of the gas delivery augmenter is configured to entrain a secondary gas deliver the entrained secondary gas (and any remaining primary gas) to the inflatable. The pump mechanism, as described in greater detail below, enables secondary gas to be pumped/delivered to the inflatable even as the inflatable backpressure increases, thus providing improved inflation over conventional aspirators.

Provided is a rotary blade engine including: an outer cylinder; an inner cylinder; an output shaft; an operation chamber; and a blade, wherein the inner cylinder is provided inside the outer cylinder, and rotates about a second center axis as a center of rotation, the second center axis being provided at a position eccentric from a first center axis of an inner peripheral surface of the outer cylinder; the output shaft is inserted into the inner cylinder, and rotates about the first center axis as a center of rotation; the operation chamber is formed between the outer cylinder and the inner cylinder; and the blade is fixed to the output shaft, rotates together with the output shaft, and defines the operation chamber by floatably penetrating the inner cylinder from an inside of the inner cylinder and slidably contacting the inner peripheral surface of the outer cylinder.

A rotational engine system comprises a rotational engine and a propulsion system. The rotational engine includes an outer ring enclosure, an inner ring component, and a drive gear. The inner ring component includes a piston and a drive gear engagement portion. The piston is configured to travel within the outer ring enclosure along a circumference of the outer ring enclosure. The drive gear engagement portion is configured to rotate as the piston travels along the circumference of the circular shape of the outer ring enclosure. The drive gear is coupled to the drive gear engagement portion of the inner ring component such that rotation of the drive gear engagement portion rotationally drives the drive gear. The propulsion system is configured to deliver propulsive energy to propel the piston along the circumference of the outer ring enclosure.

A rotational engine system comprises a rotational engine and a propulsion system. The rotational engine includes an outer ring enclosure, an inner ring component, and a drive gear. The inner ring component includes a piston and a drive gear engagement portion. The piston is configured to travel within the outer ring enclosure along a circumference of the outer ring enclosure. The drive gear engagement portion is configured to rotate as the piston travels along the circumference of the circular shape of the outer ring enclosure. The drive gear is coupled to the drive gear engagement portion of the inner ring component such that rotation of the drive gear engagement portion rotationally drives the drive gear. The propulsion system is configured to deliver propulsive energy to propel the piston along the circumference of the outer ring enclosure.

A rotary fluid pressure device, such as a low-speed, high-torque gerotor motor, is provided with a valve drive shaft that is partially inserted into and engaged with a main drive shaft as the main drive shaft engages a rotating output shaft and engages a rotating and orbiting star member of a positive displacement device. The device is also provided with a drive retainer configured to retain the engagement of the main drive shaft and the valve drive shaft.

A rotary fluid pressure device, such as a low-speed, high-torque gerotor motor, is provided with a valve drive shaft that is partially inserted into and engaged with a main drive shaft as the main drive shaft engages a rotating output shaft and engages a rotating and orbiting star member of a positive displacement device. The device is also provided with a drive retainer configured to retain the engagement of the main drive shaft and the valve drive shaft.

Durability of a vacuum pump is prevented from degrading by suppressing abrasion of a rotor and a side plate. The vacuum pump has a hollow cylinder chamber S having an opening at an end portion of a casing body, a rotor which is rotationally driven in the cylinder chamber S, a side plate for blocking the opening of the cylinder chamber S, and a pump cover which is disposed at the opposite side to the rotor so as to sandwich the side plate between the pump cover and the rotor, and the side plate is provided with an intercommunication port which confronts a shaft hole of the rotor and intercommunicates with a space between the side plate and the pump cover.

There is provided a free rotary fluid machine including: a main body which is provided in a hollow cylindrical shape, and has an elliptical inner circumferential surface; a rotor which is provided in the main body, and rotates about the same rotation center as the main body; tip seals which are provided at one side of the rotor so as to be in contact with the inner circumferential surface of the main body; and blades which are provided between the tip seals provided adjacent to each other, and supported by the tip seals, in which the blade has one end surface that faces the inner circumferential surface of the main body, and the other end surface that is opposite to one end surface, and centers of radii of curvature of one end surface and the other end surface are positioned at the same side. As described above, a space formed among the inner circumferential surface of the main body, the rotor, and the tip seal is sealed by the auxiliary tip seal, and as a result, it is possible to reduce friction between the tip seal and the main body and to prevent a leak of an introduced working fluid.