Module type multifunctional pulse conversion turbocharging system

Abstract

The invention relates to a module type multifunctional pulse conversion turbocharging system and belongs to the technical field of internal combustion engine. The module type multifunctional pulse conversion turbocharging system comprises a cylinder, an exhaust branch pipe, an exhaust pipe section, a turbine and a guide plate. The guide plate is inserted into the exhaust pipe section from a connecting part between the exhaust branch pipe and the exhaust pipe section, and gradually extends along the flowing direction of exhaust air till the guide plate is parallel to the axial line of the exhaust pipe section; the exhaust pipe section is divided into an upstream section of the exhaust pipe section, a lower downstream section of the exhaust pipe section and an extending section of the exhaust branch pipe; and the sectional area of the upstream section of the exhaust pipe section is gradually reduced. High-speed air current can be formed in an outlet of the upstream section of the exhaust pipe section; and a low-pressure region is formed in an outlet of the extending section of the exhaust branch pipe in order that scavenging is favored instead of being interfered. The air current of the outlet of the extending section of the exhaust branch pipe is basically parallel to the axial line of the exhaust pipe section, thereby producing no interference of air current. The module type multifunctional pulse conversion turbocharging system has the advantages that the module type multifunctional pulse conversion turbocharging system has simple structure, less occupation and convenient disassembly and assembly, reduces maintenance time and expense and is suitable for large-power four-stroke diesel engines with 4 to 20 cylinders and diversified supercharging degrees..

Description

Technical field [0001] The invention relates to an internal combustion engine turbocharging system, in particular to a modular multifunctional pulse conversion turbocharging system, which belongs to the technical field of internal combustion engines. Background technique [0002] The turbocharger system is the key system of a turbocharged diesel engine, which has an important impact on its power, economy and emission performance; the gas flow of the exhaust pipe system in the turbocharger system has a great influence on the performance of the four-stroke turbocharged diesel engine influences. In order to further reduce the weight per unit power, the degree of supercharging of large and medium-power medium-speed diesel engines has become higher and higher. This puts forward higher requirements for the research and design of supercharging systems, such as: good performance in all working conditions and exhaust gas. The energy utilization rate should be high, the cylinder scavenging...

AI Technical Summary

Problems solved by technology

The pulse converter supercharging system reduces the loss of part of the intake air of the turbine caused by the multi-inlet of the turbine and the blowing loss of the turbo caused by the emptying of part of the exhaust pipe, and suppresses the connected exhaust pipe through the constriction of the pulse converter The pressure wave between the cylinders interferes with the scavenging, but the system has a large volume, a complex structure, and high manufacturing costs

The exhaust branch pipes of the modular pulse conversion supercharging system are made to shrink to suppress the scavenging interference between the cylinders. The turbine efficiency is similar to that of the pressure system, which can better take into account the performance of high and low working conditions. The structure of the exhaust pipe system is quite simple, which is convenient for processing and production. The gas will be disturbed, causing the disturbed cylinder exhaust temperature to increase, affecting reliability, and sometimes the exhaust temperature will increase and the diesel engine will not reach the predetermined power.

In the existing technology, the patent application number is 200710047675.1, and the patent application titled the gas diversion compound pulse conversion turbocharging system discloses a supercharging system suitable for 4 to 20 cylinder models. Its structure For: 2 to 4 cylinders away from the turbine end adopt the structure of pulse converter, and several cylinders near the turbine end adopt the structure of modular pulse conversion supercharger system. Compared with the constant pressure system, this system can make better use of The exhaust pulsation energy has better transient and acceleration performance; compared with the pulse supercharging system, the structure is simple, the pump air work loss is small, and the turbine efficiency is high; compared with the pulse conversion supercharging system, the pump air work loss is small, avoiding large The scavenging interference is not complicated, and the structure is not complicated; compared with the modular pulse conversion supercharging system, the scavenging interference is small and the pump air work loss is small; but the structure of the exhaust piping system of this supercharging system is more complicated

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