Single piston monopropellant hydraulic free piston engine

Abstract

A single-piston single-unit hydraulic free-piston engine comprises a single-unit fuel pot, a fuel controlling electromagnetic valve, a catalyze bed, a single-piston hydraulic free-piston engine and an electric-control unit. The invention uses high-density hydrogen dioxide or the mixture of hydrogen dioxide and diesel as fuel, and decomposes the fuel via catalysis and decomposition into high-temperature high-pressure mixture gas to drive the single-piston single-unit hydraulic free-piston engine, to exchange the chemical energy of fuel with the hydraulic energy. The invention has high reliability, small volume, low weight and high energy density, or the like, while it can output power in large range by changing the size of engine or the work-frequency of engine. The invention can be used to supply hydraulic energy in non-oxygen condition or oxygen-lack condition.

Description

technical field [0001] The invention relates to a single-piston single-unit hydraulic free-piston engine, in particular to a small and medium-sized energy autonomous walking machine, a self-propelled platform, and an anoxic or hypoxic environment (such as space, underwater or plateau) that can be used in the field. etc.), belongs to the field of energy and power technology. Background technique [0002] At present, the energy supply problem is one of the key issues restricting the operation of energy autonomous walking machines in special environments such as the field, underwater and space. Most small and medium-sized energy autonomous walking machines for field operations require a power level of 10W to 1000W and a power or hydraulic energy supply device with excellent performance. Generally speaking, the main energy supply devices in this power range are chemical batteries, fuel cells or small internal combustion generator sets. However, these energy supply devices or e...

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Problems solved by technology

However, these energy supply devices or equipment have some disadvantages: the low energy density of chemical batteries makes it difficult to work for a long time; although fuel cells have higher energy density than chemical batteries, even if the hydrogen storage technology is not considered The problem of low power density makes it unsuitable for applications that require rapid power increase; for the same output power, electric actuators such as electric motors used in conjunction with the above-mentioned chemical batteries or fuel cells are generally more hydraulic or pneumatic. The mechanism is large and heavy, which leads to the reduction of system energy density and power density; for small internal combustion generator sets, although fossil fuels such as gasoline or diesel have high energy density, all hydrocarbon fuel engines except for their own moving parts such as In addition to the crankshaft and piston, complex auxiliary subsystems such as compression and ignition are also required; in addition, small internal combustion engines must operate at very high speeds to obtain good power density, so in order to match the relationship between internal combustion engines and actuators, gear reduction devices are often Indispensable, this not only increases the complexity of the system but also causes the reduction of the energy and power density of the whole system; moreover, due to the dependence of the hydrocarbon fuel internal combustion engine on the oxygen in the air, it makes them operate in anaerobic or anoxic environment (such as Underwater or space) applications are very limited

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