Abstract: Examples are provided for switching an engine fuel supply. One example system includes a direct-injection engine including a cylinder, an LPG tank for storing a LPG fuel, a CNG tank for storing a CNG fuel, a gas switching valve, a high-pressure pump connected between the LPG tank and the gas switching valve, a pressure-limiting valve connected between the CNG tank and the gas switching valve, a fuel distributor configured to be supplied with one or more of the LPG fuel and the CNG fuel via the gas switching valve, an LPG injection valve coupled to the cylinder, a CNG injection valve coupled to the cylinder, the LPG injection valve and the CNG injection valve configured to be supplied with fuel via the fuel distributor; and a controller configured to control the gas switching valve depending on an aggregate state of the fuel disposed in the fuel distributor.

Abstract: The invention relates to a fuel injector for injecting two liquid and/or gaseous fuels with an injector housing (1), comprising a nozzle body (2) and a valve body (3). A first nozzle needle (7), arranged such that it can move in a stroke-like manner, is arranged in said injector housing (1) for opening and closing an injection cross-section (27). The first nozzle needle (7) is thereby designed as a hollow needle in which a second nozzle needle (8), arranged such that it can move in a stroke-like manner, is arranged. Same cooperates with an inner nozzle seat (25) formed in the first nozzle needle (7) to open and close at least one injection opening (35). The first nozzle needle (7) and the second nozzle needle (8) border an injection chamber (20) that can be filled with fuel via a supply throttle (36). In addition, in an upper switch position, the second nozzle needle (8) is in contact with a seal seat (38) and thereby separates a connection between the injection chamber (20) and the supply throttle (36).

Abstract: A fuel injector isolator includes a support member which is rigid and which is annular in shape being centered about an axis such that the support member has a support member inner periphery which circumferentially surrounds the axis and includes a concave region. The fuel injector isolator also includes an isolation member which is resilient and compliant and which is annular in shape being centered about the axis such that the support member has an isolation member outer periphery and an isolation member inner periphery which accommodates the fuel injector therein. The isolation member is located within the support member inner periphery and includes 1) an isolation member outer periphery upper retention surface which engages the support member first end surface and 2) an isolation member outer periphery lower retention surface which extends into the concave region and engages the concave region of the support member.

Abstract: A fuel rail arrangement for an engine includes a fuel rail mounting cradle and a fuel rail fixed to the cradle. The fuel rail includes one or more outlets connected to respective fuel injector pipes. The fuel rail arrangement includes a clamp to fix both the rail to the cradle and to fix the fuel injector pipes to respective outlets in the fuel rail.

Abstract: The invention relates to a high-pressure line for conveying a fluid under high pressure to a consumer, in particular for supplying fuel under injection pressure to one or more injectors (14) of a combustion engine. It comprises a first (1), a second (2), and a third line section (3), which line sections (1, 2, 3) are flowed through successively in the intended operation of the high-pressure line and are jointly formed by a ones-piece component (4) made of metal, wherein the first line section (1) and the third line section (3) each have a smaller flow cross-section than the second line section (2) arranged between them.

Abstract: Various embodiments include a check valve for a high-pressure component in a fuel injection system comprising: a valve housing with a valve hole having an inner diameter; a valve seat and a sealing element arranged in the valve hole; and a coil spring pushing the sealing element toward the valve seat along a longitudinal axis of the valve hole. The coil spring includes a plurality of coil turns each having an outer diameter. In a non-assembled state of the check valve, the outer diameter of at least one of the coil turns is greater than the inner diameter of at least a portion of the valve hole, so that in an assembled state of the check valve, the coil spring is secured in a force-fitting manner in the valve hole.

Abstract: Methods and systems for engine-driven welding-type power supplies with secondary energy generation are disclosed. An example engine-driven welding-type power supply includes a primary energy generation system comprising an internal combustion engine configured to generate mechanical power, a generator configured to convert the mechanical power from the internal combustion engine to electric power, a welding-type power conditioning circuit to convert the electric power to welding-type power, and a secondary energy generation system configured to supplement the mechanical power output by the internal combustion engine.

Abstract: Systems and methods for operating a spark ignition engine that includes a particulate filter in the engine's exhaust system are described. In one example, a threshold temperature at which the spark ignition engine may be automatically stopped is adjusted according to an amount of soot that is stored in the particulate filter.

Abstract: Methods and apparatus are disclosed for vehicle charge control for protection against cold crank failure. An example vehicle includes a battery and a body control module. The body control module is to obtain state of charge information of the battery, obtain temperature information, and estimate a next crank time based on the state of charge information and the temperature information.

Abstract: In an ignition device, a proportion of a yoke end width defined as a distance from one end to another end of an end portion of each of a pair of yokes in the circumferential direction to a magnet width defined as a distance from one end to another end of a permanent magnet disposed on the outer circumferential surface of a flywheel, in the circumferential direction is in a range of 60% to 100%. Moreover, a proportion of the magnet width to a yoke interval between the pair of yokes is in a range of 95% to 100%.

Abstract: Methods and systems are provided for operating a variable displacement engine that includes a knock control system. Fuel injection timing and cylinder firing patterns may be adjusted to maintain engine background noise levels so that the presence or absence of engine knock may be more reliably detected. Further, select variable engine displacement modes may be avoided so that engine background noise level changes may be reduced to improve engine knock detection.

Abstract: The present disclosure provides a small, inexpensive, long-lived underwater beacon locator. The beacon locator can illustratively include a housing, a communications link, a processor, a plurality of hydrophones and a motion generator.

Abstract: A water flow turbine arrangement for capturing energy from water flows is provided. The arrangement includes: a base member (212); a generally open support structure (210) mounted to the base and upstanding therefrom, the support structure including plural legs (216) joined by a cross brace at or adjacent their upper ends; an electrical generator (230) mounted to the base; and shaft mounted turbine blades (220) mounted for rotation generally within the space occupied by the legs about a turbine axis. The turbine shaft (222) is supported at its upper end by the cross brace and is coupled to the generator at its lower end by a magnetic torque transmitting coupling, allowing complete fluid sealing of the generator's housing.

Abstract: The invention relates to a method for producing or designing a leading edge of a lifting structure, wherein starting at the midpoint of the base (0,0), a curve is applied to the profile of the structure, the length “L1” of which is according to the maximum thickness of the NACA section in the base of the profile “H0” in the base and is defined by the equation L1=0.0510H02?0.0790H0+15.5790, and the maximum height of which on the “x”-axis is located at point “L1/2” and defined by means of the relationship x=0.0137(L1)1.4944, the shape of said curve being defined by means of the equation: (y?y0)=0.0000000107x6+0.0000016382x5?0.0000794412x4+0.0010194142x3+0.0097205322x2+0.0136993913x, and the rest of the curve being calculated by means of an iterative process according to the above.

Abstract: A rotor blade assembly for a wind turbine includes a rotor blade having surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a blade tip and a blade root. The rotor blade assembly also includes at least one noise reducer adjacent to the trailing edge. The noise reducer(s) includes at least one serration extending beyond the trailing edge in a chord-wise direction of the rotor blade. The serration(s) also includes a suction side surface and a pressure side surface. The suction side surface defines a first radius of curvature in the chord-wise direction and the pressure side surface defines a second radius of curvature in the chord-wise direction. Further, the first radius of curvature may be larger than the second radius of curvature such that the suction side surface is flatter than the pressure side surface or vice versa.

Abstract: A wind turbine blade (10) for a rotor of a wind turbine (2) having a substantially horizontal rotor shaft is disclosed. The rotor comprises a hub (8), from which the blade (10) extends substantially in a radial direction when mounted to the hub (8), the blade having a longitudinal direction (r) with a tip end (16) and a root end (14) and a transverse direction. The wind turbine blade comprises a blade shell defining a profiled contour of the blade and having an inner shell wall, wherein the blade is provided with a bulkhead mounted to the inner shell wall at the root end of the blade via an attachment part, the bulkhead comprising a first side and a second side. The attachment part is integrally formed with or connected to the bulkhead, and the attachment part comprises an elastomeric material.

Abstract: Rotor restraining and rotating apparatus and methods for a wind turbine (1) are described. An apparatus (200) has a rotatable control element (204) associated with a rotor (8, 203) of the wind turbine, the control element being at least part-circular in form, the control element comprising a plurality of engagement formations (205) disposed on a periphery thereof. The apparatus also has a control member (206), comprising a plurality of engagement formations (207). The control member is movable (208) in a first degree of freedom between: (a) a non-restraining position; and (b) a restraining position in which the control member engagement formations are able to engage the control element engagement formations to restrain rotation of the control element. The control member is also movable (209) in a second degree of freedom.

Abstract: Generating a control schedule for a wind turbine, the control schedule indicating how the turbine maximum power level varies over time. Generating the control schedule includes determining a value indicative of the current remaining fatigue lifetime of the turbine, or one or more turbine components, based on measured wind turbine site and/or operating data; applying an optimisation function that varies an initial control schedule to determine an optimised control schedule by varying the trade off between energy capture and fatigue life consumed by the turbine or the one or more turbine components until an optimised control schedule is determined.

Abstract: A lightning transmission device between the rotor and the nacelle in a wind turbine, which comprises: a first electricity conductor platen, where one of its ends is separated at a distance with respect to a metal strip located at a root of each blade; a second electricity conductor platen, where one of the ends is separated a distance with respect to a gutter element; an electrical conductor between the first and second platen; an electrical insulator coupled to said first and second platens; which is also coupled to the hub of the wind turbine; and a relative displacement unit between the first and second platen, the unit configured to ensure a predefined distance between the end of the first platen and the metal strip; and between the end of the second platen and the gutter element.

Abstract: The present application discloses a compressor including a crank shaft, a first reciprocation converter, a first cylinder body, a first pressurizing portion, a second reciprocation converter, which is connected to the crank shaft with a phase different by 180 degrees from the first reciprocation converter, a second cylinder body, a second pressurizing portion, and a connecting portion configured to interconnect the compression chambers. The compression chambers are arranged so that a timing at which the gas is discharged from a specific compression chamber among the compression chambers becomes the same as a timing at which the discharged gas is suctioned into another compression chamber at a higher side by one stage than the specific compression chamber.

Abstract: A variable capacity compressor includes a compression chamber that compresses a working fluid, an inlet chamber to house the working fluid to be compressed, a discharge chamber to house the working fluid compressed in the compression chamber and discharged therefrom, a control pressure chamber to house a swash plate rotating in accordance with a rotation of the drive shaft, a supply passage to facilitate communication between the discharge chamber and the control pressure chamber, a bleed passage to facilitate communication between the control pressure chamber and the inlet chamber, a first control valve including a first valve portion to adjust an opening degree of the supply passage, a second control valve provided on the bleed passage and including a spool housing recess formed on the bleed passage, and a back pressure chamber between the spool and a bottom of the spool housing recess.

Abstract: A linear compressor includes a piston with a piston head and a cylindrical side wall. An inner surface of the cylindrical side wall defines a ball seat. A coupling extends between a mover and a piston. The coupling includes a flex mount that extends between a first end portion and a second end portion. The flex mount is connected to the mover away from the first end portion of the flex mount. A ball nose is positioned at the first end portion of the flex mount. The ball nose contacts the piston at the ball seat of the piston. A spring urges the ball nose against the ball seat of the piston.

Abstract: Suction muffler (1) for a hermetic refrigeration compressor (2), the suction muffler (1) comprising an inlet (3), so that refrigerant can flow into the suction muffler (1), and an outlet (4), so that refrigerant can flow out from the suction muffler (1), the suction muffler (1) further comprising two damping chambers (5, 6) for sound damping, where the two damping chambers (5, 6) each has a floor (8, 9) and where a wall element (11) is provided, in order to separate the two damping chambers (5, 6) from each other for the refrigerant in the region of their floors (8, 9).

Abstract: An arrangement has a housing, which has a receptacle or an opening, and a cylindrical insert, which is mounted in the receptacle or opening via at least one interference fit. The insert has a peripheral groove, and therefore the insert is both fastened against the housing and sealed against the housing in a liquid- and/or gas-tight manner by way of material of the insert and/or housing that has been pressed into the groove during the assembly. The material of the insert and/or of the housing is displaced in the case of an interference fit. The groove provides a defined location to which the material can preferably flow. After the assembly has been concluded, the insert is locked against the housing by the material located in the groove. At the same time, the material acts as a seal between the insert and the housing. A separate seal in the region of the press fit becomes dispensable.

Abstract: An aerosol-generating device includes a pump. The pump includes a first pump chamber and a second pump chamber on opposing sides of a separation element. Each of the first pump chamber and the second pump chamber have an inlet valve and an outlet valve configured to establish a pumping direction. The pump also includes a first actuator and a second actuator. The first actuator is associated with the first pump chamber and the second actuator is associated with the second pump chamber. The first actuator and the second actuator are each configured to change a chamber volume of the respective pump chamber. The pump further includes a common inlet, and a common outlet. The common inlet and common outlet are in fluid communication with the first pump chamber and the second pump chamber and are configured to establish a flow direction. The pumping direction is aligned with the flow direction.

Abstract: To provide a tube pump which includes: a drive mechanism including a first roller unit and a second roller unit which rotate about an axis line while being in contact with a tube having elasticity, and a first drive unit and a second drive unit which cause the first roller unit and the second roller unit to rotate independently about the axis line; a holding mechanism which holds the tube in an arcuate shape about the axis line; and an attachment mechanism which detachably attaches the holding mechanism to the drive mechanism.

Abstract: A miniature pneumatic device includes a miniature fluid control device and a miniature valve device. The miniature fluid control device includes a gas inlet plate, a resonance plate, a piezoelectric actuator and a gas collecting plate. The length and width of the gas collecting plate are between 4 mm and 10 mm. A first chamber is formed between the resonance plate and the piezoelectric actuator. After a gas is fed into the gas inlet plate, the gas is transferred to the first chamber through the resonance plate and then transferred downwardly. Consequently, a pressure gradient is generated to continuously push the gas. The miniature valve device includes a valve film and a gas outlet plate. After the gas is transferred from the miniature fluid control device to the miniature valve device, the valve opening of the valve film is correspondingly opened or closed and the gas is transferred in one direction.

Abstract: A preparative separation-purification system has controlling apparatus, which has a pump housing for pumping liquid. The apparatus also has a moving component for reciprocating in the pump housing so as to draw a liquid into the pump housing and discharge the liquid from the pump housing and a driving source for reciprocating the moving component. A setting unit is provided for setting a target liquid supply amount or a target amount which corresponds thereto. A unit amount memory unit is provided for storing a discharge amount of the reciprocating pump per a reciprocal movement of the moving component or a unit amount which is a value corresponding to the discharge amount. A computation unit is provided for computing the smallest multiple number of the unit amount which is equal to or larger than the target amount; and a motor controller for controlling the driving source.

Abstract: A hydraulic pressure supply system includes a mechanical oil pump; an electric oil pump; an electric motor that drives the electric oil pump; a control device that controls the operation of the electric oil pump; and a hydraulic pressure measurement circuit that measures a hydraulic pressure of the outlet-side pipe of the electric oil pump. The control device starts supplying electric power to the electric motor to thereby start drive of the electric oil pump before the mechanical oil pump stops operating, and limits the power-supply current to the electric motor to a first current or less during a time period between the start of the drive of the electric oil pump and the time when the hydraulic pressure measured by the hydraulic pressure measurement circuit exceeds a prescribed outlet hydraulic pressure.

Abstract: In a drive device, a pump includes a pump room in a housing, a suction port through which oil is to be sucked into the pump room, and a discharge port through which the oil is to be discharged from the pump room. The housing includes an inner lid that holds a bearing journaling a motor shaft and covers one side in an axial direction of a stator, an outer lid that is attached to one side in the axial direction of the inner lid and covers one side in the axial direction of the motor shaft, and a suction oil passage connecting a lower region in a vertical direction in an accommodation portion and the suction port. At least a portion of the suction oil passage is between the inner lid and the outer lid. The inner lid includes an opening penetrating the inner lid and connecting the lower region in the vertical direction and a portion of the suction oil passage between the inner lid and the outer lid. The strainer is provided in the opening.

Abstract: A two-stage variable-displacement oil pump includes a casing having a suction port for suctioning oil stored in an oil tank and a discharge port for discharging, to a main gallery; an outer cam ring rotatably installed with respect to a pivot shaft provided inside the casing and having a rotary chamber therein; a rotor installed to be eccentric relative to the outer cam ring, rotating in concert with a rotation of a driving shaft, and including a plurality of vanes radially and slidably installed on an outer circumferential surface of the rotor; a support spring having one end contacting a spring support part formed on an outer side surface of the cam ring and the other end contacting an inner side surface of the casing; and a regulating chamber provided between the outer cam ring and the casing.

Abstract: The scroll compressor (1) includes a fixed scroll (7); an orbiting scroll (8); a drive shaft (16); a support arrangement (5) including a thrust bearing surface (9) on which is slidably mounted the orbiting scroll (8); a rotation preventing device configured to prevent rotation of the orbiting scroll (8) with respect to the fixed scroll (7), the rotation preventing device including orbital discs (28) respectively arranged in circular receiving holes (29) provided on the support arrangement (5), each orbital disc (28) being provided with an outer circumferential bearing surface (31) cooperating with an inner circumferential bearing surface (32) of the respective circular receiving hole (29); and a lubrication system configured to lubricate the inner and outer circumferential bearing surfaces (32, 31) with oil supplied from an oil sump (50), the lubrication system including lubrication passages (41) formed within the support arrangement (5), each lubrication passage (41) including an oil outlet aperture (41.

Abstract: A scroll compressor includes a casing having a cylindrical barrel and lid, a compression mechanism having fixed and movable scrolls, and a suction passage that sends a fluid into a compression chamber. The fixed scroll includes a fixed-side end plate, a fixed-side wrap standing upright on the fixed-side end plate, and a suction hole. The suction hole is capable of communicating with the compression chamber. The suction passage includes an insertion pipe portion inserted into a through hole of the lid, and an in-plate passage formed in the fixed-side end plate and having an outflow opening opened toward the suction hole. A center of the through hole is closer to an axis of the barrel than a center of the outflow opening of the in-plate passage. An entirety of the suction passage is positioned radially outward of a portion, of the through hole, closest to the axis of the barrel.

Abstract: Control systems and methods for increasing efficiency of a compressor while the compressor capacity exceeds compressor load, by using a mechanical unloader such as a slide valve to reduce the internal volume ratio of the compressor and allow a more efficient speed to be maintained by a variable frequency drive (VFD) while reducing the compressor capacity based on the load. Control systems include the VFD, a controller for the VFD and the mechanical unloader, and temperature sensors. Compressor embodiments further include one or more compressors and mechanical unloaders operated by the control systems.

Abstract: The present disclosure provides a compressor system having at least one fluid compressor for compressing a working fluid. A lubrication supply system is operable for supplying lubrication fluid to the compressor. A closed loop cooling system using R718 refrigerant is provided to cool the working fluid. The closed loop cooling system includes a refrigerant compressor for compressing the refrigerant, a condenser operable for receiving compressed refrigerant gas and removing heat to form liquid refrigerant, and an expansion device for expanding and cooling the liquid refrigerant into a cooled gaseous refrigerant.

Abstract: A drainage apparatus for a motorcompressor comprises a first pipe with a first end configured to be inserted in a drainage sump of a motorcompressor; a second end configured to be connected to a duct of a stage of the motorcompressor; a device for generating a pressure difference between said second and said first end so that liquid is taken from said drainage sump and delivered into said duct.

Abstract: A fan device is provided, including a housing, a circuit board, a plurality of driving coils, at least one magnetic member, and a metal member. The housing includes a first surface, a second surface corresponding to the first surface, and a hollow protruding portion protruding from the first surface. The circuit board is disposed on the first surface, and the driving coils are disposed on the circuit board. The magnetic member is disposed corresponding to the driving coils. The metal member is disposed on the second surface and corresponds to the magnetic member. A method for manufacturing the fan device is also provided.

Abstract: A blower device includes: a fan; a motor rotating the fan; a case supporting the motor; and a heat generating component housed in the case, wherein the case includes: a main body member defining a flow path portion that guides blown air, generated by rotation of the fan, to the heat generating component; and a closing member closing an opening formed on the flow path portion, the main body member includes a fixing portion provided on the flow path portion and fixing the closing member, and the fixing portion is located inside an inner peripheral edge of the opening.

Abstract: A gas turbine engine has a compressor section with a low pressure compressor and a high pressure compressor having a downstream end. A cooling air system includes a tap from a location upstream of the downstream most location. The tap passes air to a boost compressor, and the boost compressor passes the air back to a location to be cooled. The boost compressor is driven by a shaft in the engine through an epicyclic gear system. A speed control changes the relative speed between an input and an output to the epicyclic gear system.

Abstract: A multi-stage compressor system is a system of a multi-stage compressor in which compressors are connected in series in a plurality of stages includes a control unit. The control unit determines whether a malfunction is present in the system by comparing a suction flow rate of a first-stage compressor measured by a first sensor with a downstream flow rate from an outlet of the multi-stage compressor measured by a second sensor.

Abstract: A method for monitoring a surge in a fluid device and a refrigeration system. A fluid device is disposed in an operating unit. The method includes providing and displaying a surge line of the fluid device, where the surge line is at least related to a characteristic between fluid pressure and a flow rate of the fluid device; based on preset time intervals, sequentially providing and displaying operating points, of the fluid device in a current operation condition, in a coordinate system to which the surge line belongs, and when a quantity of the provided operating points exceeds a preset value, removing the first provided operating point therein, so that a quantity of the remaining operating points is the preset value; and monitoring a surge status of the fluid device according to relative position relationships between the displayed operating points and the surge line.

Abstract: A system for measuring turbulence of a flow of a turbine engine, notably of a turbine engine compressor includes a first housing with a first pressure sensor and a first inlet, a second housing with a second pressure sensor and a second inlet inclined relative to the first inlet, and a temperature sensor. The system is configured to calculate at least two orientation components of the velocity of the flow on the basis of the pressure sensors and the temperature sensor. The inlets are disposed at the vane foot, on the leading edge at the level of an internal shell.

Abstract: A fan, such as a ceiling fan, includes a learning mode of operation. This learning mode may permit a user to input a desired speed for the fan for a given condition, such as ambient temperature, and adjustments for other conditions would be automatically determined based on the user input. A subsequent selection of fan speed at that condition (such as, for example, for a different user) or a different condition setting would also be obtained, either during initialization or later, and then used as an updated measure of the desired fan speed for the condition. Related methods of controlling the operation of a fan are also disclosed.

Abstract: An apparatus includes a blower drive and a protection circuit. The blower drive includes a processor and a capacitor. The capacitor is electrically coupled to the processor and provides electrical power to the processor during a short circuit in the blower drive. The protection circuit is electrically coupled to the blower drive and includes a first switch, a positive temperature coefficient resistor, and a second switch. The positive temperature coefficient resistor is electrically coupled in series to the first switch. The second switch is electrically coupled in parallel to the positive temperature coefficient resistor and opens during the short circuit in the blower drive. The first switch opens after the second switch opens and after a short circuit current is below a threshold.

Abstract: An arrangement for attaching an object to a fan blade so that the orientation of the object can be adjusted to achieve a desired orientation while the fan blade is rotated by the fan. The object is attached to the bottom end of an invisible filament. The top end of the invisible filament is attached to an enlargement, such as a button. The button is captured between the fan blade and an elastic band that encircles the fan blade. The button can be manually rotated to thereby rotate the invisible filament and the object so that the object is oriented in the desired manner when rotated by the fan. The object can be of the type that flies with a natural orientation, such as a bird, airplane, space ship, etc.

Abstract: A multi-spool gas turbine engine comprises a low pressure (LP) spool and a high pressure (HP) spool. The LP spool has an LP shaft for transferring a torque from an LP turbine to an LP compressor. The HP spool has an HP shaft for transferring a torque from an HP turbine to an HP compressor. The LP shaft is coaxially mounted inside the HP shaft. An inter-shaft bearing is mounted radially between the LP shaft and the HP shaft. The inter-shaft bearing is disposed axially between the HP compressor and the LP compressor.

Abstract: A multi-stage pump featuring different stages configured to pump a fluid from a pump suction and to a pump discharge; and a center bushing configured between the different stages, having a center bushing side configured with pockets to balance axial forces between the different stages of the multistage pump. The pockets are configured as curved rib pockets, extruded circle or circular pockets, or full length rib pockets.

Abstract: A fan module includes a housing, a bearing, a rotating shaft, and a fan wheel. The housing includes a bottom covering plate, a top covering plate, and a side wall connected between the bottom covering plate and the top covering plate and surrounding to form a housing space. The bearing is disposed on the bottom covering plate and includes a supporting pillar. The supporting pillar extends from the bottom covering plate toward the top covering plate. The rotating shaft has a first through hole therein. The rotating shaft is rotatably sleeved onto the supporting pillar by the first through hole. The fan wheel is connected to an outer edge of the rotating shaft.

Abstract: A centrifugal compressor includes a housing, a partition separating an empty space in a housing into a speed increaser chamber and an impeller chamber, an insertion hole provided in the partition to allow insertion of a high-speed shaft, a seal located in the insertion hole to seal a boundary between the partition and the high-speed shaft, and a bearing receptacle located in the partition. The partition includes a communication passage that allows communication between a portion of the insertion hole located closer to the speed increaser chamber than the seal and the bearing receptacle.

Abstract: A rotary machine includes a first impeller which rotates about an axis integrally with a rotating shaft, and a casing which covers the rotating shaft and the first impeller. The first impeller includes a circular-disk-shaped first disk part centered on the axis, a plurality of blade parts which extend from a surface facing a first side of the first disk part in an axial direction toward the first side in the axial direction and disposed at intervals in a circumferential direction, and an extension shaft which extends from a surface facing a second side of the first disk part in the axial direction toward the second side in the axial direction centered on the axis. An end portion of the extension shaft on the second side in the axial direction is connectable to an end portion of the rotating shaft on the first side in the axial direction.