Abstract: A driveshaft assembly for a compressor includes an unloader assembly and a driveshaft. The unloader assembly includes an unloader and a counterweight. The unloader assembly is rotationally supported by a bearing. The unloader includes a flank surface that is slidably engaged with a flank surface on the driveshaft.

Abstract: A compressor includes a compression mechanism, and a muffler structure disposed between a compression-chamber outlet of the compression mechanism and an inflow end of a discharge pipe. The muffler structure includes a first muffler portion and a second muffler portion connected in series such that a refrigerant gas repeats expansion and contraction.

Abstract: Disclosed are a pump body assembly and a fluid machine. The pump body assembly includes a rotation shaft and a piston provided with a sliding hole, at least a portion of the rotation shaft penetrates into the sliding hole, during rotation of the piston with the rotation shaft, and the sliding hole is in sliding fit with the rotation shaft, the piston is provided with a piston communication passage communicated with the sliding hole. The pump body assembly can solve the problem that the piston impedes a flow of oil liquid during use of a rotary cylinder compressor.

Abstract: An asymmetric scroll compressor includes a compressor housing. An orbiting scroll member and a non-orbiting scroll member disposed within the compressor housing. The orbiting scroll member and the non-orbiting scroll member each includes a baseplate and a wrap extending from the baseplate. The orbiting scroll member and the non-orbiting scroll member intermeshed to form a plurality of compression pockets. A driveshaft affixed to the orbiting scroll member and configured to orbit the orbiting scroll member from a first orbital position to a second orbital position. A communication port disposed on the baseplate of one of the orbiting scroll member and the non-orbiting scroll such that: in the first orbital position, the communication port communicates with a first enclosed pocket of the plurality of compression pockets, and in the second orbital position, the communication port communicates with a second enclosed pocket of the plurality of compression pockets.

Abstract: A scroll compressor with a stationary scroll, an orbiting scroll, and a discharge port through which a fluid that has been compressed by both the scrolls is discharged. An end plate of the orbiting scroll is provided with an end-plate side stepped portion formed such that, along a spiral of a spiral wrap, the height thereof increases toward a central side of the spiral and decreases toward an outer end side thereof. A spiral wrap of the stationary scroll is provided with a wall-portion side stepped portion formed corresponding to the end-plate side stepped portion such that the height thereof decreases toward the central side of the spiral and increases toward the outer end side thereof. A pair of compression chambers face each other. The ventral side compression chamber communicates with the discharge port before the dorsal side compression chamber communicates with the discharge port.

Abstract: A screw compressor for compressing a working medium sucked through a suction opening and discharging the compressed working medium through a delivery opening, wherein the screw compressor includes: a male rotor and a female rotor that rotate while meshing with each other; a casing that houses the male rotor and the female rotor and is provided with a bore which forms a working chamber designed, together with the male rotor and the female rotor, to compress the working medium; a drive unit that rotationally drives at least one of the male rotor and the female rotor; a working chamber closing unit that forms a suction port for sucking the working medium into the working chamber and closes the working chamber when the working chamber reaches a specified capacity; and a suction space that connects the suction opening and the suction port to allow communication therebetween.

Abstract: The present disclosure generally relates to methods for additive manufacturing (AM) for fabricating multi-walled structures. A multi-walled structure includes a first wall having a first surface and a second wall having a second surface facing the first surface to define a passage having a width between the first surface and the second surface in a first direction. The multi-walled structure also includes an enlarged powder removal feature connecting the first wall and the second wall. The enlarged powder removal feature has an inner dimension greater than the width in the first direction and at least one open end in a direction transverse to the first width.

Abstract: A rotary internal combustion engine includes a rotor housing having a peripheral wall circumscribing a rotor cavity and a rotor disposed within the rotor cavity. A side housing is secured to the rotor housing and a plate defines a seal running surface for the rotor. The plate is disposed between a portion of the side housing and the rotor housing and at least one shim is disposed between the plate and the side housing for spacing the plate apart from contact with the side housing.

Abstract: A rotary engine side housing is provided that includes a side plate portion, a side housing body portion, a coolant chamber, and a plurality of posts. The side plate portion has exterior and interior surfaces. The coolant chamber is disposed internally within the side housing body portion. The coolant chamber is defined by a chamber base surface, the peripheral side walls, and the side plate portion interior surface. The chamber base surface and the side plate portion interior surface are spaced apart from one another and the one or more peripheral side walls extend there between. The plurality of posts extend between the chamber base surface and the side plate portion interior surface. The side plate portion, the side body housing portion, and the plurality of posts are integrally formed with one another.

Abstract: An orbiting scroll of a scroll compressor includes a platter wall having a first face including a spiral structure projecting therefrom, a second face having a coupling structure configured to couple the orbiting scroll to a drive mechanism of the scroll compressor, and a circumferential surface connecting the first face to the second face in an axial direction of the platter wall. The orbiting scroll includes a mass reduction feature provided as an inwardly indented channel formed in the circumferential surface. The channel is further configured to form a retaining feature for retaining a rim of a mask during a process of coating the spiral structure of the first face with a surface coating.

Abstract: A method for detecting a urea consumption deviation including: calculating a pump pressure correction factor fac; calculating a urea consumption deviation factor A when the pump pressure correction factor fac is within a calibrated range; calculating the urea consumption deviation factor A multiple times, and calculating an average value of A; and comparing the average value of the urea consumption deviation factor A with a calibrated limiting value range, so as to determine whether there is a great deviation between an actual urea consumption value and a theoretical urea consumption value, the calculating the pump pressure correction factor fac comprises: adjusting a pressure of a urea pump to P1; adjusting the pressure of the urea pump to P2, where P2 is smaller than P1; recording a time T1 during which the pressure of the urea pump is adjusted from P1 to P2; and calculating fac=T1/(P1?P2).

Abstract: A scroll compressor is provided that may include a block insertion groove to accommodate a discharge port and at least one bypass hole disposed in a rear surface of a non-orbiting end plate of a non-orbiting scroll, and a retainer block including at least one bypass valve to open or close the bypass hole inserted into the block insertion groove. The bypass hole may include a first bypass hole and a second bypass hole. The bypass valve may include a first bypass valve to open or close the first bypass hole and a second bypass valve to open or close the second bypass hole, and may be disposed between the block insertion groove and the retainer block facing the block insertion groove. Accordingly, the first and second bypass valves are not fastened to the non-orbiting end plate, which may allow the non-orbiting end plate to be made thin.

Abstract: A gerotor pump arrangement for extracting hydraulic fluid from a transmission housing of a transmission. A first gerotor set has a first inner rotor and a first outer rotor, and a second gerotor set has a second inner rotor and a second outer rotor. The first gerotor set forms a hydraulically drivable drive side of the gerotor pump arrangement, and the second gerotor set forms a pump side, driven by the first gerotor set, wherein the first and second inner rotors are rotationally fixedly mounted on a common shaft which is rotatable about a rotational axis. A transmission with such a gerotor pump arrangement is also disclosed.

Abstract: A bearing assembly includes a first gear shaft aligned with a first axis and a second gear shaft aligned with a second axis. The second axis is oriented parallel to the first axis. A first bearing is supported on the first gear shaft and a second bearing is supported on the second gear shaft. A coupling mechanism extends between and radially clamps the first bearing to the second bearing. The coupling mechanism is operable to restrict relative radial movement between the first bearing and the second bearing.

Abstract: A compressor includes first and second scroll members and a bearing housing. The first scroll member includes a first end plate and a first scroll wrap. The second scroll member includes a second end plate that has a first surface, a second surface, and an oil passage. The first surface has a second scroll wrap meshingly engaging the first scroll wrap. The second surface includes an oil aperture. The oil passage is in fluid communication with the oil aperture. The bearing housing cooperates with the second scroll member to define an interior volume. Lubricant in the interior volume is selectively allowed to flow into the oil passage via the oil aperture.

Abstract: A screw assembly for a triple screw pump includes a central screw and at least one lateral screw, both provided with one or more helicoidal threads. The lateral screw is arranged to mesh with the central screw, with a lateral screw axis being parallel to a central screw axis. The distance between the axes of the central screw and the lateral screw is greater than the half and lower than 3/5 of a central screw external diameter.

Abstract: A multi-stage screw compressor includes a plurality of stages of compressor bodies that compress a gas in sequence. Each of the stages of compressor bodies has both male and female rotors that are housed revolvably in a casing in a mutually meshing state. The male and female rotors each include a rotor lobe section having a suction-side end face and a discharge-side end face on one end and the other end thereof in the axial direction and having a twisted lobe extending from the suction-side end face to the discharge-side end face. The male and female rotors in a downstream-stage compressor body of at least one certain stage, excluding an upstream-stage compressor body as the first stage, among the plurality of stages of compressor bodies are each configured such that their lead increases from the suction side in the axial direction of the rotor lobe section toward the discharge side.

Abstract: A compressor control device includes: an inlet guide vane disposed in an inlet section of a compressor; a variable stationary blade disposed downstream of the inlet guide vane; a rotor blade disposed between the inlet guide vane and the variable stationary blade; a first actuator for adjusting a first opening degree of the inlet guide vane; a second actuator for adjusting a second opening degree of the variable stationary blade; a compressor inlet temperature detection part for detecting a compressor inlet temperature in the inlet section; and a control part for controlling the first actuator and the second actuator. The control part controls the first actuator and the second actuator such that an opening degree ratio of the first opening degree to the second opening degree increases as the compressor inlet temperature decreases, if the compressor inlet temperature is less than a threshold.

Abstract: A scroll compressor includes a housing and a compression mechanism. The compression mechanism includes a compression chamber. The housing includes an intermediate pressure chamber into which refrigerant having an intermediate pressure is introduced from an external refrigerant circuit. The intermediate pressure is higher than a suction pressure of refrigerant drawn into the compression chamber and lower than a discharge pressure of the refrigerant discharged from the compression chamber. The intermediate pressure chamber and the compression chamber in a process of compression are connected to each other by an injection passage. The injection passage includes a muffler.

Abstract: A scroll compressor includes a first scroll member, a second scroll member, and an aerostatic thrust bearing. The aerostatic thrust bearing forms a layer of gas between the second scroll member and a fixed supporting member to support the second scroll member as the second scroll member rotates and/or orbits. Also disclosed is a method of supporting a rotating/orbiting scroll member in a scroll compressor. The method including supplying pressurized gas to an aerostatic thrust bearing such that a layer of gas is formed between the rotating/orbiting scroll member and a fixed supporting member.