Abstract: According to one embodiment, a rotary compressor includes a compression mechanism unit. When H is the length of a middle shaft part, Hp is the length of a bearing hole, Dp is the inner diameter of the bearing hole, Dc is the outer diameter of a crank part, Dm is the outer diameter of the middle journal part, C1 is the axial length of a first chamfered part provided to a middle shaft part-side end edge of the crank part, C2 is the axial length of a second chamfered part, C3 is the axial length of a third chamfered part, and C4 is the axial length of a fourth chamfered part, Dp is larger than Dc and Dm, and the relationships of [Equation 1] H?Hp, [Equation 2] H>Hp?C1?C2??{square root over ((Dp2?Dc2))}, and [Equation 3] H>Hp?C3?C4??{square root over ((Dp2?Dm2))} are all satisfied.

Abstract: The present disclosure relates to a field of scroll compressors, and more particularly to a muffler device and a compressor with the muffler device. In one embodiment, a muffler device includes a sound hood inside which an expanding cavity is defined, and a microporous plate which is disposed inside the expanding cavity and divides the expanding cavity into a first cavity body and a second cavity body, and a plurality of through holes are provided in the microporous plate such that the air flow entering the expanding cavity exits the expanding cavity after passing through the plurality of through holes of the microporous plate. The muffler device and the compressor with the muffler device provided herein may effectively reduce the noise of the scroll compressor, especially pneumatic noise.

Abstract: Repeated cycles each consist of a pump down phase and a holding phase, wherein a start timepoint of each cycle is the timepoint when a rise in an inlet pressure of the pump is sufficiently large and the time extending between two consecutive cycle start timepoints is a cycle time. A control method includes determining a start of a next cycle during a present cycle, wherein it is preferable that the present cycle directly precedes the next cycle. The method further includes controlling the pump to accelerate to a maximum allowed speed during the holding phase of the present cycle before the start of the next cycle such that at the start of the next cycle full pump capacity is available.

Abstract: A scroll compressor comprising: a fixed scroll and a moving scroll, the moving scroll being configured to be capable of orbiting relative to the fixed scroll in order to compress fluid; a main bearing base supporting the moving scroll; and an axial flexible mounting mechanism, the fixed scroll being connected to the main bearing base by means of the axial flexible mounting mechanism, such that the fixed scroll can move a predetermined distance along the axial direction, the axial flexible mounting mechanism comprising a bolt and a sleeve arranged on the outer circumference of the bolt, the sleeve comprising in the axial direction a first section in contact with the main bearing base and a second section in contact with the fixed scroll, and the first section being configured such that the bending rigidity in the radial direction is different to the bending rigidity in the tangential direction.

Abstract: A discharge muffler for a fluid pump is formed by a cowling and a muffler insert configured to be removably inserted into a muffler receptacle of the cowling. The muffler insert includes a muffler inlet, a muffler outlet, and a plurality of muffler walls. The pump includes a pumping stage, a motor, and a drive shaft coupled between the pumping stage and the motor. When the muffler insert is inserted into the muffler receptacle, the muffler inlet communicates with the pumping stage, and the cowling and the muffler insert cooperatively define the discharge muffler. The discharge muffler is configured or effective to suppress noise generated by fluid discharged from the pumping stage.

Abstract: A scroll compressor is provided that is configured to increase the amount of refrigerant injected into a target compression chamber to which refrigerant is desired to be injected. The scroll compressor has a fixed scroll that has a first base plate with an injection-pipe connection port to which an injection pipe is connected, a first injection hole that passes through the first base plate and communicates with one of the compression chambers, a communication hole that communicates with the injection-pipe connection port and the first injection hole, a second injection hole that passes through the first base plate and communicates with one of the compression chambers with which the first injection hole communicates, and a groove that is formed in a face opposite to a face on which a first scroll wrap is formed and communicates with the first injection hole and the second injection hole.

Abstract: A VIVACE converter to harness energy from currents as well as from waves— that is, the present teachings provide a method and apparatus to collect energy from both currents and waves—using the same physical components. The present teachings are particularly useful in that either currents and/or waves may exist on their own nearly everywhere in the oceans and frequently coexist.

Abstract: Disclosed are a method and a device for balancing crankshaft deformation e, a crankshaft with counterweights determined according to the method, and a scroll compressor using the crankshaft. The method includes: determining a component centrifugal force required by a counterweight to overcome the crankshaft deformation caused by both an orbiting scroll centrifugal force and a gas force; and determining the counterweight according to the component centrifugal force. The counterweight is arranged on the crankshaft.

Abstract: A soft actuator includes an origami structure with an inflatable hollow body formed from at least one of Dyneema fabric or Kevlar fabric, and a plurality of TCPAs formed from at least one of polyethylene terephthalate, spandex, and nylon. The soft actuator also includes a plurality of heating wires disposed on the plurality of TCPAs and a controller configured to selectively heat the plurality of heating wires such that the plurality of TCPAs are selectively actuated by being heated by the plurality of heating wires.

Abstract: A bearing system for a compressor including an unloader at least partially received within a recess of a driveshaft. The unloader includes an outer surface that is engaged with a bearing. An inner surface of the unloader is curved such that the unloader is pivotable relative to the driveshaft unload forces on bearing caused by deflection of the driveshaft.

Abstract: A compressor wheel for a compressor of a turbocharger has a hub and a multiplicity of blades on the hub. In intermediate spaces of the multiplicity of blades, a channel is in each case formed between a suction side and a pressure side. The channel guides fluid that flows in axially in relation to a rotation axis radially or radially-axially outward. The hub in relation to the rotation axis is contoured such that the hub has a rotationally symmetrical portion and a non-rotationally symmetrical portion. On the non-rotationally symmetrical portion, a transition between the hub and each of the blades is embodied with a radiused connection and facing the suction side has a region of modified thickness. A region formed by control rays is generated in at least one channel between the suction side and the pressure side on the hub. A method produces the compressor wheel.

Abstract: The present disclosure relates to methods for starting and rapidly decelerating a turbomachine in a power generation system that utilizes a supercritical fluid in a closed cycle.

Abstract: A vacuum pump for supplying a machine assembly with negative pressure, the vacuum pump including a housing featuring a delivery chamber which includes a chamber inlet opening and a chamber outlet opening for a gaseous fluid; a suction port for establishing a fluid connection to the machine assembly; a suction channel which connects the delivery chamber to the suction port; and a relief channel which connects the delivery chamber to a relief opening of the housing; a delivery member which can rotate in the delivery chamber in a forward rotational direction and a reverse rotational direction. The fluid is suctioned into the delivery chamber through the chamber inlet opening and discharged through the chamber outlet opening by rotating the delivery member in the forward rotational direction.

Abstract: A solution mined cavity system and method are disclosed. The system comprises an underground cavity created by solution mining in salt deposits, an upper water reservoir, tubing structure adapted to lead water from the upper water reservoir into the underground cavity and out of the underground cavity, and a pumping device adapted to contribute to pumping water from the upper water reservoir via the tubing structure out of the cavity.

Abstract: Provided with a power generator and a power generation method capable of generating electricity using water of river or the like with a simple facility without using large facilities required in a conventional hydroelectric power plant. A buoyancy power generator includes: a storage tank which is capable of storing water; an inlet port from which the water is introduced into the storage tank; an outlet port from which the water is discharged from the storage tank to an outside; an opening and closing mechanism for opening and closing the outlet port; a floating body arranged in the storage tank so as to be vertically movable; and a power generator configured to convert a vertical motion of the floating body into electricity. A buoyancy power generation method using the above described power generator.

Abstract: A heat exchanger has arcuate inlet and outlet manifolds and a plurality of tube banks, each tube bank coupling one of the inlet manifold outlets to an associated one of the outlet manifold inlets. Each tube bank partially nests with one or more others of the tube banks and has: a first header coupled to the associated inlet manifold outlet and the associated the outlet manifold inlet; a second header; and a plurality of tube bundles each having a first end coupled to the associated first header and a second end coupled to the associated second header. A flowpath from the each inlet manifold outlet passes sequentially through flowpath legs formed by each of the tube bundles in the associated tube bank to exit the tube bank to the associated outlet manifold inlet.

Abstract: A sliding component has an annular shape with a fluid facing inside and outside of the sliding component and has a sliding surface relatively sliding with eccentric rotation, in which the sliding surface includes a land and a plurality of dynamic pressure generation mechanisms arranged in a circumferential direction, the dynamic pressure generation mechanism includes a shallow groove portion and a deep groove portion, the shallow groove portion communicates with the deep groove portion, and a communication passage providing a communication between the deep groove portion and either an inside space or an outside space of the sliding component is formed in the sliding component.

Abstract: A groove is applied to one or more contact surfaces of a journal bearing of a pump to increase a force applied to the contact surface(s). Each groove has an end exposed to discharge pressure of the pump so that the groove communicates the discharge pressure across the contact surface. The groove reduces an area of the contact surface over which fluid leakage results in a pressure differential, thereby increasing a net force applied to the contact surface. Applying the groove to the axial end face of the journal bearing enhances an axial force applied to the journal bearing whereas applying the groove to a radially facing land reduces friction between the journal bearing and the outer housing.

Abstract: A compressor includes a housing and a mixed-flow rotor mounted within the housing. The mixed-flow rotor includes a blade and a rotor hub with an interior flow passage. The blade includes an internal channel between a pressure surface and a suction surface of the blade. The internal channel extends radially within the blade and is in fluidic communication with the interior flow passage. The blade also includes a plurality of air outlets formed on the blade proximate a leading edge of the blade. The plurality of air outlets extends into the blade to fluidically connect with the internal channel.

Abstract: A monolithic heat exchanger body for inputting heat to a closed-cycle engine includes heating walls and heat sink, such as heat transfer regions. The heating walls are configured and arranged in an array of spirals or spiral arcs relative to a longitudinal axis of an inlet plenum. Adjacent portions of the heating walls respectively define corresponding heating fluid pathways fluidly communicating with the inlet plenum. At least a portion of the heat sink is disposed about at least a portion of the monolithic heat exchanger body. The heat sink includes working-fluid bodies including working-fluid pathways that have a heat transfer relationship with the heating fluid pathways. Respective ones of the heat transfer regions have a heat transfer relationship with a corresponding semiannular portion of the heating fluid pathways. Respective ones of the heat transfer regions include working-fluid pathways fluidly communicating between a heat input region and a heat extraction region.