The bearing assembly, consisting of a stator component (S1) and a rotor component (R1), where the rotor component is adapted for a back-and-forth oscillatory movement (P, P) relative to the stator component, whereby a number of cavities (301 and 302; 303 and 304) coordinated along the outer periphery of the rotor component and the inner periphery of the stator component, formed with an increasing volume (301 and 302) and a decreasing volume (303 and 304), respectively, during rotation of the rotor component in an initial direction (P) from an initial position (IP) and towards a final position (FP), while the cavities allow the volumes to decrease and increase during a rotational motion of the rotor component in a second direction (P) in relation to the stator component (S1). The invention specifies that the above-mentioned bearing arrangement is to be adapted to interact with an instrument (M1) in order to determine, with the help of at least two components, the momentary position of the rotor component in relation to the stator component.

The bearing assembly, consisting of a stator component (S1) and a rotor component (R1), where the rotor component is adapted for a back-and-forth oscillatory movement (P, P) relative to the stator component, whereby a number of cavities (301 and 302; 303 and 304) coordinated along the outer periphery of the rotor component and the inner periphery of the stator component, formed with an increasing volume (301 and 302) and a decreasing volume (303 and 304), respectively, during rotation of the rotor component in an initial direction (P) from an initial position (IP) and towards a final position (FP), while the cavities allow the volumes to decrease and increase during a rotational motion of the rotor component in a second direction (P) in relation to the stator component (S1). The invention specifies that the above-mentioned bearing arrangement is to be adapted to interact with an instrument (M1) in order to determine, with the help of at least two components, the momentary position of the rotor component in relation to the stator component.

A longer-lasting, lower cost, more powerful, all metal, mud motor than the presently available progressing cavity type mud motors for drilling boreholes into the earth. A mud motor apparatus possessing one single drive shaft that turns a rotary drill bit, which apparatus is attached to a drill pipe which provides high pressure mud to the mud motor, wherein the drive shaft receives at least a first portion of its rotational torque from any high pressure mud flowing through a first hydraulic chamber within the apparatus, and receives at least a second portion of its rotational torque from any high pressure mud flowing through a second hydraulic chamber within the apparatus. A typical mud motor apparatus possesses two or more hydraulic chambers, each having its own power stroke, and return stroke, which act together in a controlled fashion to provide continuous power to a rotary drill bit.

A rotary-vane internal combustion engine of the cat and mouse or scissor type with coordinated rotation of two co-axial shafts with position sensors creating chambers of variable volume for intake, compression, power and exhaust strokes. A reversible electric generator motor on at least one of the shafts with an electronic control system for current, an energy storage unit and electrical load. The total work done and angular speed is calculated or empirically determined while an alternating accelerating or decelerating torque is applied for a continuous, uniform rotation cycle.

A rotary-vane internal combustion engine of the cat and mouse or scissor type with coordinated rotation of two co-axial shafts with position sensors creating chambers of variable volume for intake, compression, power and exhaust strokes. A reversible electric generator motor on at least one of the shafts with an electronic control system for current, an energy storage unit and electrical load. The total work done and angular speed is calculated or empirically determined while an alternating accelerating or decelerating torque is applied for a continuous, uniform rotation cycle.

A tip seal for scroll wraps in a scroll compressor is provided. The tip seal may include surface features to form a tortuous flow path in a seal groove of a scroll wrap. The surface features can help form one or more contraction and/or expansion areas in the tortuous flow path. The tortuous flow path can help provide resistance to fluid flow and help reduce leakage through the seal groove.

A pressure control valve (100, 200) comprises a valve seat (140, 160) in which is formed a valve hole (142, 162), a first valve sheet member (110, 210) which covers the valve hole and is provided with a fluid passage (118, 218) thereon, and a second valve sheet member (120, 220) which is provided between the valve seat and the first valve sheet member and covers the fluid passage. Wherein, given that the direction directed from the second valve sheet member to the first valve sheet member is a first direction, when the pressure difference across two sides of the first valve sheet member and the second valve sheet member is directed to the first direction and is greater than or equal to a first preset value, the first valve sheet member is opened; when the pressure difference is directed to a second direction opposite to the first direction and is greater than or equal to a second preset value, the second valve sheet member is opened. Also disclosed is a scroll compressor comprising the pressure control valve. Also disclosed is a scroll compressor comprising a throttle valve for preventing or weakening the return flow from the back-pressure chamber to the pressure chamber.

A rotary-vane internal combustion engine of the cat and mouse or scissor type with coordinated rotation of two co-axial shafts with position sensors creating chambers of variable volume for intake, compression, power and exhaust strokes. A reversible electric generator motor on at least one of the shafts with an electronic control system for current, an energy storage unit and electrical load. The total work done and angular speed is calculated or empirically determined while an alternating accelerating or decelerating torque is applied for a continuous, uniform rotation cycle.

A compressor provided with an oil stabilizing member capable of preventing oil stored in an oil storage space from being scattered is provided. A compressor may include a closed container provided with an inlet port and an outlet port, a compression unit configured to compress refrigerant introduced into an inside the closed container through the inlet port, a driving unit configured to provide a driving force to drive the compression unit, a rotating shaft configured to deliver the driving force to the compression unit, an oil storage space formed at a lower portion of an inside the closed container and configured to store a predetermined oil to come into contact with one end portion of the rotating shaft, and an oil stabilizing member installed so as to move along a surface of oil formed at the oil storage space, thereby preventing the oil from being scattered and thus released through the outlet port, wherein the oil stabilizing member floating on the surface of the oil prevents oil from being scattered upward according to operation of the compressor.

A longer-lasting, lower cost, more powerful, all metal, mud motor than the presently available progressing cavity type mud motors for drilling boreholes into the earth. A mud motor apparatus possessing one single drive shaft that turns a rotary drill bit, which apparatus is attached to a drill pipe which provides high pressure mud to the mud motor, wherein the drive shaft receives at least a first portion of its rotational torque from any high pressure mud flowing through a first hydraulic chamber within the apparatus, and receives at least a second portion of its rotational torque from any high pressure mud flowing through a second hydraulic chamber within the apparatus. A typical mud motor apparatus possesses two or more hydraulic chambers, each having its own power stroke, and return stroke, which act together in a controlled fashion to provide continuous power to a rotary drill bit.