Pneumatic and internal combustion hybrid system based on multi-stage utilization of afterheat of cooled water

Abstract

The invention relates to an engine power system, and aims to provide a pneumatic and internal combustion hybrid system based on multi-stage utilization of afterheat of cooled water. According to the system, an air inlet pressure stabilization box of a pneumatic engine is connected with an air storage tank through a high pressure air pipeline; an air cylinder body and an air cylinder cover of a water-cooled internal combustion engine, a water pump and a pipeline form loop circulation; a circulation loop of the cooling water in the water-cooled internal combustion engine is divided into three stages; the first stage of the circulation loop is small circulation of the internal combustion engine body; the second stage of the circulation loop and the third stage of the circulation loop are respectively added into a pneumatic engine air cylinder and a water and air heat exchanger; and the stages of circulation loops are switched by turning on and turning off an electronic thermostat. The system makes full use of the afterheat of the cooling water in the internal combustion engine, so that the working environment of the pneumatic engine is improved, the circulation output power of the pneumatic engine is improved effectively, and the air consumption rate of the pneumatic engine is reduced finally; furthermore, the energy consumption of the internal combustion engine is reduced; and the dynamic property and the economy of the power system are improved.

Description

technical field [0001] The invention relates to an engine power system, in particular to an aerodynamic-internal combustion hybrid power system based on multi-stage utilization of cooling water waste heat. Background technique [0002] In order to alleviate the dual pressure of oil resource shortage and environmental pollution, pneumatic-internal combustion hybrid power has long been proposed as a category in the field of new energy vehicles. A pneumatic engine refers to an engine that uses compressed air or liquid nitrogen as a working medium to push a piston to do work, thereby outputting power. Thanks to the use of compressed air or liquid nitrogen, air motors are truly zero-emission. However, the output power of the pneumatic engine alone is low, the temperature of the cylinder wall, cylinder head and other components is low during the working process, and the expansion of the working fluid absorbs less heat from the environment, so the energy of compressed gas or liqui...

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Problems solved by technology

[0003] The "hybrid engine" disclosed in Chinese patent [200710067863.0] uses the exhaust of the internal combustion engine to heat the air intake of the pneumatic engine, which improves the dynamic performance of the aerodynamic working mode to a certain extent, but the patent does not involve the use of heat from the cooling water of the internal combustion engine question

The "pneumatic-fuel hybrid power system" disclosed in Chinese patent [200910097991.9] introduces the cooling water of the internal combustion engine into the heat exchanger, and uses the cooling water to heat the intake air of the pneumatic engine, but only uses the cooling water at the first level. The disadvantages are: Energy recovery rate is not high

Chinese patent [200810059577.4] discloses a "nested pneumatic / internal combustion hybrid engine" that uses the form of arranging pneumatic cylinders around the internal combustion cylinder to cool the internal gas cylinder, but this structure brings about the problem of uneven heat distribution, and the pneumatic cylinder is not very good. Utilize waste heat from the internal combustion engine

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