65results about How to "Flow loss minimization" patented technology

An improved outlet guide vane system is disclosed for axial flow fans. Construction details are described which reduce losses in the end wall regions of the vanes, particularly for axial flow fans operating at low flow coefficient with strong localized swirl associated with upstream rotor tip clearance flows. In the preferred embodiment, the vane spanwise airfoil stacking line is approximately straight, while leaning circumferentially toward the incoming swirl flow over the majority of the radial span. The stacking line then curves abruptly in the opposite direction over the radially outboard spanwise portion, so as to lean away from the incoming swirl at the vane tip station. The radially outboard portion of the vanes simultaneously include a gradual increase in vane stagger angle, vane camber angle and vane chord. The vane may also include an axial sweep component.

Disclosed herein is an air-blowing apparatus of a cleaner. The air-blowing apparatus comprises a fan having a plurality of blades spaced apart from each other in the circumferential direction of the fan for generating a blowing force in the centrifugal direction thereof, and a diffuser disposed outside the fan in the radial direction of the fan for diffusing air blown from the fan. Each blade is formed such that at least a part of the blade is shorter than the other part of the blade extending to the outer diameter of the fan, whereby noise is reduced while blowing efficiency is not affected.

An air conditioning apparatus is provided. The air conditioning apparatus includes a cover assembly having an indoor air suction hole, a filter assembly cleaning indoor air sucked through the indoor air suction hole, and a grill. The grill includes a discharge grill formed on a side for discharging the indoor air cleaned by the filter assembly to an indoor area, and an exhaust grill for discharging indoor air to an outdoor area. A fan assembly draws indoor or outdoor air toward the grill. A rear panel is coupled to the grill. The rear panel includes a suction hole formed in one side for introducing outdoor air and an exhaust hole formed beside the suction hole for discharging indoor air to the outdoor area.

An air induction sound modification system for an internal combustion engine includes a multi-frequency sound suppression unit having Helmholtz resonators and a multi-component expansion chamber. A sound generator, which functions to radiate sound at a desirable, tuned frequency, extends between the multi-function sound suppression unit and a second expansion chamber, such as an air cleaner box.

A blade cascade of a turbomachine whose at least one side wall is configured to be circumferentially undulated and which has at least two elevations and at least one depression or at least two depressions having at least one elevation, as well as a turbomachine having a blade cascade of this kind.

The invention discloses an integrated tapered cold-end heat exchanger for a linear pulse tube refrigerator and a manufacturing method. The heat exchanger mainly comprises a shell, a tapered slit body and a T-shaped guide core column, wherein the shell is a main heat-dispersing surface and a coupled interface, protects the tapered slit body and the T-shaped guide core column and is connected with a regenerator and a pulse tube; the tapered slit body is cut inside the shell by a low-speed wire cutting technology; the T-shaped guide core column is arranged in the center; and a core column slit is cut on the guide core column. According to the heat exchanger, the heat exchanging area is maximized within a limited volume by uniformly cutting the tapered slit in unequal diameters; the cutting way makes a natural transition from a large diameter end to a small diameter end; the thermal resistance and flow loss are minimized; and the gas in the pulse tube is laminarized without an additional gas director. The heat exchanger greatly improves the performance of the whole linear pulse tube refrigerator and is very significant to the practicality of the linear pulse tube refrigerator, aerospace application and other aspects.

An air induction sound modification system for an internal combustion engine includes a multi-frequency sound suppression unit having Helmholtz resonators and a multi-component expansion chamber. A sound generator, which functions to radiate sound at a desirable, tuned frequency, extends between the multi-function sound suppression unit and a second expansion chamber, such as an air cleaner box.

Systems for taking exhaust gas samples are known. Use is normally made of CVS systems in which an exhaust gas channel (4) is fluidically connected to an exhaust gas source (6) via an exhaust gas inlet (2) and an air channel (10), into which ambient air is sucked via an air filter (16), opens in a first mixing zone (22) which merges into a dilution tunnel (24) from which the samples are taken. The invention now proposes that the system have a second exhaust gas channel (38) which is fluidically connected to a second exhaust gas source (36) via a second exhaust gas inlet (34) and has a second mixing zone (46), wherein the diluted exhaust gas / air mass flows flow either from the first exhaust gas source (6) or from the second exhaust gas source (36) into the one dilution tunnel (23) and to the sampling probe (26). A particularly advantageous embodiment is described in this respect. The system is suitable for the connection of diesel and spark ignition engines, the exhaust gas of which can thereby be removed and analysed for the first time via only one sampling point and using only one dilution tunnel and one pump in a common system.

Disclosed herein is an air-blowing apparatus of a cleaner. The air-blowing apparatus comprises a fan having a plurality of blades spaced apart from each other in the circumferential direction of the fan for generating a blowing force in the centrifugal direction thereof, and a diffuser disposed outside the fan in the radial direction of the fan for diffusing air blown from the fan. Each blade is formed such that at least a part of the blade is shorter than the other part of the blade extending to the outer diameter of the fan, whereby noise is reduced while blowing efficiency is not affected.

A refrigerator comprises: a fan for blowing cool air generated by an evaporator to a freezing chamber or a refrigerating chamber; a scroll guide for discharging cool air discharged from the fan in two directions; a guide pipeline formed at the scroll guide in two directions for guiding cool air discharged from the scroll guide; and a cool air duct connected to the guide pipeline for supplying cool air to the freezing chamber or the refrigerating chamber. An optimum scroll guide that can be applicable even when a plurality of cool air ducts are implemented is provided, thereby reducing a flow loss of cool air discharged from the fan and decreasing consumption power.

The present invention relates to a valve with a housing (1) and a piston (2), wherein the piston (2) has a channel (3) connecting the two end faces (4; 5) and a piston ring (9) which protrudes radially outward and which is arranged on the outside of the piston (2) and is disposed between the two end faces of the piston (2). A ring-shaped, axially aligned valve seal (13), the end surface (14) of which forms the closing surface (15) of the piston, is disposed on one of the two end faces (5) and, in the closed state of the piston (2), is in contact with a seating surface (15) of the correspondingvalve space (7). Furthermore, the piston (2) and the valve seal (13) are dimensioned and disposed in such a way that the active areas (16; 17) thereof are practically equalized in the open state of the piston (2) and, in the closed state, the active area (16) of the end face (5) in the region of the valve seal (13) is smaller than that of the opposite end face (4).

The invention discloses a secondary intermediate heat exchanger for a thermal coupling coaxial two-stage pulse pipe refrigerator and a design method. The heat exchanger is of a structure which is machined through a hollow high-heat-conductivity material and is approximate to a column shape, and conical slit bodies are arranged in the middle. The slit bodies are of trapezoidal fin structures arranged on the circumference uniformly. The inner hole diameter of each slit body is equal to the diameter of a pulse pipe, the outer diameter of the upper end of each slit body is equal to the inner diameter of a regenerator of the low-temperature section, and the outer diameter of the lower end of each slit body is equal to the inner diameter of a regenerator of the high-temperature section. According to the secondary intermediate heat exchanger, conical slits are uniformly machined in the portions of unequal diameters, maximization of the heat exchange area in the limit size is achieved, the machining manner transits naturally from the large-diameter end to the small-diameter end, and the flow loss is minimized. The secondary intermediate heat exchanger can effectively improve the overall performance of the thermal coupling coaxial two-stage pulse pipe refrigerator.

An air conditioner may provide a a fan housing assembly that moves in the front-rear direction by the operation of an actuator, and the fan housing assembly moves so as to pass through a front outlet arranged on a door assembly to be in a projected state, and the front end of the fan housing assembly protrudes further to the front than the front surface of the door assembly; and through the projected state, may provide conditioned air by a direct air flow to a long-distance target region. The configuration may enable the minimization of interference between the discharged air and the door assembly, and the minimization of flow loss of the discharged air since, when the fan housing assembly is in the projected state, a steering grill is in a state of protruding to the outside of the door assembly by passing through the front outlet.

A hydraulic pressure supply system of an automatic transmission may include a low-pressure oil pump generating low hydraulic pressure while being driven by an engine to exhaust the low hydraulic pressure to a first low-pressure channel, a high-pressure oil pump raising a portion of the hydraulic pressure in the first low-pressure channel to a high pressure while being driven by an electric motor to exhaust the hydraulic pressure to a first high-pressure channel, a low-pressure regulator valve controlling the hydraulic pressure while exhausting a portion of the hydraulic pressure to supply the controlled hydraulic pressure to a low-pressure part through a second low-pressure channel, and a high-pressure regulator valve controlling the hydraulic pressure while re-circulating a portion of the hydraulic pressure to the low-pressure part through single or two re-circulation channels according to the pressure to supply the controlled hydraulic pressure to a high-pressure part through the second high-pressure channel.

The vacuum suctioning unit of the present invention includes: a cover provided with an air entrance; an impeller for circulating air that enters the air entrance; a motor provided with a shaft connected to the impeller; a guide device for guiding the flow of air that exits an exit of the impeller; and a motor housing that houses the motor and is provided with an air exit. The guide device includes: a guide body disposed below the impeller; a first guide vane formed on a side surface of the guide body and guiding air discharged from the impeller; and a second guide vane formed on the bottom surface of the guide body and connected to the first guide vane to guide air that is moved by the first guide vane. The entrance angle of the first guide vane is within the range of 10 to 27 degrees.

The invention relates to a fuel injector (3) for operation with combustible gas, wherein the fuel injector (3) has, at a nozzle end (25), a gas nozzle assembly (23) having at least one gas nozzle opening (27); wherein the fuel injector (3) has at least one gas nozzle needle (21), which is associated with the gas nozzle assembly (23) and is accommodated in an axial holder (29) in such a way that the stroke of the at least one gas nozzle needle can be controlled, wherein each gas nozzle opening (27) leads out of the holder (29) having a radial direction component at the nozzle end (25); wherein the fuel injector (3) has, in the holder (29), a needle seat (31) upstream of the particular nozzle opening (27), which needle seat is provided for selectively blocking a combustible-gas flow path to the associated gas nozzle opening (27) in interaction with the gas nozzle needle (21); wherein the one or more gas nozzle openings (27) are distributed merely over part of the circumference in the circumferential direction (A) of the gas nozzle needle (21), wherein the holder (29), adjoining the needle seat (31) and extending away therefrom axially in the upstream direction, is asymmetric with respect to an axial center axis (B) through the gas nozzle needle (21), wherein the asymmetry results from a cross-section expansion (33) of the holder (29) on a side of the holder (29) that lies radially opposite the at least one gas nozzle opening (27), such that a greater mass flow rate of combustible gas can be conducted in the holder (29) by means of the cross-section expansion (33) than on the gas nozzle opening side (35) opposite thereto; wherein the holder (29) is also shaped to apply a flow direction oriented toward the radially opposite at least one gas nozzle opening (27), already upstream of the needle seat (31) and by means of the cross-section expansion (33), to a combustible-gas flow (C) guided to the needle seat (31) by the cross-section expansion (33).

A ring structure with a metal design for a moving blade of axially flowed through compressor and turbine stages, particularly in gas turbine engines is provided. The ring structure includes a circular ring-shaped outer wall, a circular ring-shaped inner wall, which is located at a short radial distance from the moving blade tips, and includes a joining structure provided in the form of hollow chamber structure between the outer wall and the inner wall. The outer wall is provided in the form of a closed, mechanically stable housing wall of the compressor or turbine stage, and the joining structure provided in the form of hollow chamber structure is joined in a fixed manner to the outer wall and to the inner wall, for example, by soldering, diffusion welding or other joining techniques. The inner wall is provided in the form of a closed, mechanically stable structure, which serves as a run-in lining for the moving blade tips and which is made of a metal woven fabric and / or of a metal felt.

A collecting chamber of a flow machine which expands in the direction of circumference, including at least one outer shell part and a contour insert is provided. The contour insert is provided with a groove which extends in the circumferential direction and is preferably configured as a helical spiral. The contour insert, is cut from a whole unit and is delimited at one end in the circumferential direction by a bent edge so that the flow losses are minimized during the passage from the collecting chamber into a subsequent diffuser.

The invention relates to a rotor (10) for a turbo machine, in particular for an aircraft turbine, with rotating blades (12) that are joined to a basic rotor body (16), whereby at least one channel (22) extending between the high-pressure side (HD) and the low-pressure side (ND) of rotor (10) radially underneath a blade platform (18) of at least one rotating blade (12) is provided, whereby a slope of a principal axis of extension (H) of channel (22) relative to an axis of rotation (D) of rotor (10) has the same sign as a slope of a principal axis of extension (R) of a radially inner boundary of the flow channel of rotor 10. In addition, the invention relates to a turbo machine having a rotor (10) as well as to a method for manufacturing a rotor (10) for a turbo machine.

A structure for reducing a refrigerant flow loss in a compressor includes a refrigerant flow resistance reducing unit to reduce a refrigerant channel resistance at a lower surface of a rotor facing a compression mechanism unit. When the high temperature and high pressure refrigerant gas discharged from the compression mechanism unit flows to the discharge pipe through the refrigerant passage including the gap between the rotor and the stator of the electric mechanism unit, the flow resistance of the refrigerant gas is reduced. Therefore, since the refrigerant can flow smoothly, a flow loss of the refrigerant can be reduced and, as a noise generation is reduced, a reliability can be heightened.

The invention discloses a clutch device used for a transmission system of a vehicle. The clutch device comprises an input side connected with a driving motor; a first output side and a second output side, which are respectively used for connection with an input shaft of a transmission. The clutch device comprises a torque converter connected between the input side and the first output side. The coupling of the torque converter is adjusted, and then the improving of the positive or negative rotating speed of the input side with respect to the first output side can be adjusted.

A method for creating an impeller and an impeller of a radial turbo fluid energy machine includes a wheel disc, cover disc, blades, and hub. The hub is mounted on a shaft which extends along an axis, the wheel disc extends substantially radially from the hub, and the cover disc is connected to the wheel disc by the blades such that flow channels separated from one another in the circumferential direction are defined by the blades. The impeller has a first flow passage in a substantially axial direction in the radial proximity of the hub, and the impeller has a second flow passage in a substantially radial direction radially farther away from the hub than the first flow path passage. The cover disc surface facing the wheel disc has a lower degree of roughness at least in some regions than the wheel disc surface facing the cover disc.