41results about How to "Reduce blowby" patented technology

The invention discloses a self-generated mixed particle-reinforced aluminum alloy cylinder sleeve and a preparation method thereof. The self-generated mixed particle-reinforced aluminum alloy cylinder sleeve comprises an aluminum alloy and certain amounts of Ni and Si. The preparation method of the self-generated mixed particle-reinforced aluminum alloy cylinder sleeve comprises the following steps that in alloy solidification, Al3Ni particles first separated out from melt can push a part of Si primary crystal particles to move outward with the Al3Ni particles under the action of a centrifugal force; a cannular blank casting is obtained, wherein the cannular blank casting has an outer segregation layer containing a mass of primary Al3Ni and Si primary crystal mixed particles, an inner segregation layer containing Si primary crystal particles, and a middle base layer; and the inner segregation layer and the middle base layer of the cannular blank casting are removed by turning and the outer segregation layer having a high volume fraction is left so that the self-generated mixed particle-reinforced aluminum alloy cylinder sleeve is obtained. The self-generated mixed particle-reinforced aluminum alloy cylinder sleeve and an aluminum cylinder can be subjected to compression casting assembly molding and then are processed into an all-aluminum internal-combustion engine through machining and assembling. The self-generated mixed particle-reinforced aluminum alloy cylinder sleeve has light weight, high particle volume percentage content and excellent wear resistance and high-temperature resistance, and can improve engine work efficiency.

A piston ring having an outer running face, two flanks and an inner circumferential face is provided. The running face has profiling. The profile of the running face is substantially convexly curved and has an apex. The axial position of the apex varies periodically in the circumferential direction.

The invention discloses a sparking plug ignition device in a combustion chamber of a small rotary engine and a method, and belongs to the field of small rotary engines. The device provided by the invention comprises a first working chamber, a second working chamber, an ordinary sparking plug, a sparking plug channel, an ignition chamber, sealing sheets and a third working chamber, and further comprises an engine cylinder, a modified sparking plug, a modified sparking plug anode, bushings, a cathode and a triangle rotor. The sparking plug ignition device provided by the invention has the following advantages by removing the ignition chamber and the sparking plug channel: (1) energy loss is reduced and the probability of blow-by of gas between two adjacent cylinders is lowered; and (2) the compression ratio can also be improved without changing the rest of the structure, and the smaller the size of an engine, the greater the increase in the compression ratio. By improving the ignition position from the interior of the ignition chamber to the interior of the combustion chamber, the following advantages are achieved: (1) the flame propagation distance is greatly reduced, and the possibility of knocking and flame quenching of the small rotary engine is reduced; and (2) the direct contact of spark with compressed fresh gas mixture reduces the difficulty in ignition.

A turbocharger includes a compressor housing, turbine housing, and center housing between the compressor and turbine housings. A turbine wheel is disposed in the turbine housing on a turbine shaft. A compressor wheel having a shank is disposed in the compressor housing on the turbine shaft. The shank has outer and reduced portions. The reduced portion has a smaller diameter than the outer portion. A backplate is mounted to the compressor housing adjacent the compressor wheel and defines a stepped cylindrical bore with a maximum diameter portion and a minimum diameter portion having a smaller diameter than the maximum portion. The outer portion is disposed in the maximum portion. The reduced portion is disposed in the minimum portion. The outer diameter of the shank is greater than or equal to the minimum diameter of the backplate, and the stepped cylindrical bore and the shank define a variable width gap.

A piston ring having an outer running face, two flanks and an inner circumferential face is provided, the running face of which has profiling with a groove. The groove is arranged between two running face sections in relation to the cross section of the piston ring. The two running face sections are spaced apart from each other and substantially convexly curved and each have an apex. The groove has a periodically varying depth and a periodically varying width, and the number of periods of the course of the depth and the number of periods of the course of the width are equal.

A structure for mounting a piston ring mounted around a piston head of a piston is provided. The structure includes a ring groove formed along the piston head with a guide recess circumferentially formed in the ring groove in a certain section. The piston ring is rotatably fitted into the ring groove. A guide protrusion is formed on the piston ring and is provided in the section of the guide recess such that the guide protrusion is rotated within the section. The structure is configured such that when a plurality of piston rings is mounted around the piston head, rotation sections of the end gaps of the piston rings are not aligned with each other.

In a two-stroke internal combustion engine using air for scavenging its combustion chamber (4), a scavenging passage (6) communicating with a crankcase (2) and a combustion chamber (4) is charged first with rich air-fuel mixture generated by a carburetor, next with lean air-fuel mixture, and next with air through an in-piston passage (36). The lean air-fuel mixture is generated in the in-piston passage 36 by diluting the air-fuel mixture with the air. In each scavenging stroke to scavenge the combustion chamber (4), the combustion chamber (4) is supplied first with the air (40) and next with the lean air-fuel mixture (42) from the scavenging passage (6). The use of the lean-air-fuel mixture (42) next to the air (40) contributes to reduce acceleration failure or engine stop caused by sudden acceleration.

The invention discloses a steam turbine high-pressure steam guide pipe drainage system and method, and belongs to the technical field of thermal power generation devices. The system comprises a high-pressure cylinder applied to the field of steam turbines, four steam guide pipes are arranged on the high-pressure cylinder, each steam guide pipe is provided with a main steam adjusting valve and further communicated with a drain pipe, and the drain pipe is communicated with a drain flash tank through a valve assembly; warm pipe pipelines are arranged between the drain pipes, the drain pipes are communicated in series through the warm pipe pipelines, or the drain pipes are communicated in pairs through the warm pipe pipelines; according to the invention, the structural design breaks through the design of a traditional structure, especially the design of utilizing a heating pipeline, and the mutual communication effect is realized, so that the steam guide pipe behind the opened high-pressure main steam regulating valve heats the steam guide pipe behind the closed high-pressure main steam regulating valve, the risk that water or cold steam enters a high-pressure cylinder is eliminated, and the service life of the high-pressure cylinder is prolonged. And the safety of the unit is improved.

The invention discloses a continuous vacuum coating sealing lock for a metal strip. The continuous vacuum coating sealing lock comprises an upper sealing cover, a lower sealing cover and sealing rollers, wherein the upper sealing cover and the lower sealing cover are detachable, the sealing rollers are arranged between the upper sealing cover and the lower sealing cover, and shaft shells adapted to the sealing roller are arranged on the upper sealing cover and the lower sealing cover respectively; a shaft shell flexible layer is arranged on the inner surface of each shaft shell; the sealing rollers comprise a plurality of upper sealing rollers and a plurality of lower sealing rollers, the upper sealing rollers and the lower sealing rollers are arranged in a staggered mode, sealing roller flexible layers are arranged on the upper sealing rollers and the lower sealing rollers respectively, and the surfaces of the sealing roller flexible layers of the upper sealing rollers make contact with the surfaces of the sealing roller flexible layers of the lower sealing rollers respectively; a sub-chamber is formed among every three adjacent sealing rollers; each sub-chamber is connected with a vacuum pump; and the metal strip passes through the space between the upper sealing rollers and the lower sealing rollers. For the continuous vacuum coating sealing lock for the metal strip of the invention, an inlet cavity is divided into a plurality of sub-chambers, and the shaft shell form, the shaft shell flexible layers and the sealing roller flexible layers are adopted for sealing, so that the vacuumizing efficiency is greatly improved.