Single piston hydraulic free-piston engine capable of reducing pumping flow pulsation

Abstract

The invention discloses a single piston hydraulic free-piston engine capable of reducing pumping flow pulsation. In the invention, two power pistons are respectively arranged in the two cylinder bodies of two orthostichous cylinder blocks and are fixedly connected with a piston rod; the end faces of the two power pistons are positioned in the same vertical face; a hydraulic pump piston and a compression piston are arranged in a hydraulic cylinder block and is fixedly connected with the piston rod, the external diameter of the hydraulic pump piston is larger than that of the compression piston, and the hydraulic pump piston and the compression piston divide the hydraulic cylinder block into a first hydraulic pump cavity, a second hydraulic pump cavity and a compression cavity; the second hydraulic pump cavity consists of a working cavity and a backpressure cavity; the inner diameter of the working cavity are matched with the external diameter of the hydraulic pump piston, and the inner diameter of the backpressure cavity is matched with the external diameter of the compression piston; a high-pressure energy accumulator is communicated with the working cavity through the first oil pumping port of the working cavity by means of a check valve; and the first oil port of a flow regulating valve is communicated with the first hydraulic pump cavity through the second oil pumping port of the first hydraulic cavity, the second oil port of the flow regulating valve is communicated with the high-pressure energy accumulator, and the third oil port of the flow regulating valve is communicated with a low-pressure oil tank.

Description

technical field [0001] The invention relates to a piston engine, in particular to a single-piston hydraulic free-piston engine capable of reducing pump flow pulsation. Background technique [0002] With the strengthening of people's awareness of energy saving and environmental protection, the performance requirements of internal combustion engines are increasing day by day; the hydraulic free piston engine with variable compression ratio can burn a variety of alternative fuels, and can choose the best compression ratio according to the load condition. The engine is at the best fuel economy point or the lowest emission point or a compromise between the two, thereby improving fuel economy and reducing emission pollution. Therefore, the hydraulic free piston engine is known as "the promising power star of walking machinery". [0003] The hydraulic pump part of the single-piston hydraulic free-piston engine is a valve-distributed plunger pump, and the plunger reciprocates in th...

AI Technical Summary

Problems solved by technology

However, adjusting the flow through the residence time will cause the output flow pulsation of the pump to increase. In order to reduce the impact of flow pulsation on the load, it is generally necessary to select a larger volume accumulator, which increases the weight of the system and occupies space, and reduces The power-to-weight ratio of the engine is improved; the hydraulic pump chamber is divided into several separate small chambers, which increases the complexity of the system structure and control

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