278 results about "Pressure work" patented technology

A sealing material for sealing liquid composed of a seal main body of resin, having a U-shaped cross section and a concave groove opening to an axis direction, and an O-ring of rubber fit to the concave groove of the seal main body used for medical appliances and paint appliances. The seal main body is provided with an end lip portion on a side along the axis direction and a main lip portion on a middle position of the axis direction on a sliding face side, and, in a pressure-receiving state in which pressure works on the side along the axis direction and the O-ring is compressed, a dimension of the axis direction from a base end face of the seal main body on other side along the axis to a cross-section central point of the O-ring and another dimension of the axis direction from the base end face to an end portion of the main lip portion are set to be approximately equal.

An internal combustion engine includes in one aspect a source of a pressurized working medium and an expander. The expander has a housing and a piston, movably mounted within and with respect to the housing, to perform one of rotation and reciprocation, each complete rotation or reciprocation defining at least a part of a cycle of the engine. The expander also includes a septum, mounted within the housing and movable with respect to the housing and the piston so as to define in conjunction therewith, over first and second angular ranges of the cycle, a working chamber that is isolated from an intake port and an exhaust port. Combustion occurs at least over the first angular range of the cycle to provide heat to the working medium and so as to increase its pressure. The working chamber over a second angular range of the cycle expands in volume while the piston receives, from the working medium as a result of its increased pressure, a force relative to the housing that causes motion of the piston relative to the housing.

A sealing material for sealing liquid composed of a seal main body of resin, having a U-shaped cross section and a concave groove opening to an axis direction, and an 0-ring of rubber fit to the concave groove of the seal main body used for medical appliances and paint appliances. The seal main body is provided with an end lip portion on a side along the axis direction and a main lip portion on a middle position of the axis direction on a sliding face side, and, in a pressure-receiving state in which pressure works on the side along the axis direction and the O-ring is compressed, a dimension of the axis direction from a base end face of the seal main body on other side along the axis to a cross-section central point of the O-ring and another dimension of the axis direction from the base end face to an end portion of the main lip portion are set to be approximately equal.

The invention discloses a high-temperature high-pressure casing cement sheath stratum sealing integrity evaluation device and method. The device comprises a high-temperature high-pressure kettle, a temperature and pressure control system and a combination body, wherein the high-temperature high-pressure kettle realizes alternating temperature and pressure experiment conditions of combination bodysealing integrity evaluation; the temperature and pressure control system realizes temperature and pressure regulation and control and experiment data monitoring and recording during the combination body sealing integrity evaluation period; and the combination body realizes the simulation of a full-size or compact-size casing cement sheath stratum of a high-temperature high-pressure oil and gas well target well section. Through simulating the alternating temperature, pressure and casing inner pressure work conditions of the high-temperature high-pressure oil and gas well target well section, casing / cement sheath / stratum combination body samples are designed and prepared; the blow by pressure difference among the combination body, a well cementation interface I and a well cementation interface II is tested; the internal defect appearance dimension and the compressive strength change rule are analyzed; and the stable and reliable experiment method and data support are provided for the well cementation cement sheath sealing and isolation capability detection and sealing integrity evaluation.

Provided is a thin-film magnetic head for reading data from a magnetic recording medium and / or writing data to a magnetic recording medium, in which the magnetic spacing can be controlled appropriately by stably adjusting the pressure working between the thin-film magnetic head and the magnetic recording medium according to the change of conditions such as the change over time. This thin-film magnetic head comprises at least one through hole reaching a surface opposed to the magnetic recording medium of the thin-film magnetic head, for adjusting a pressure working between the thin-film magnetic head and the magnetic recording medium. Preferably, the head further comprises at least one flow-amount control means for controlling the flow amount of gas that flows via the at least one through hole.