Multistage Stirling engine and steady-state operation parameter regulating and controlling method thereof

Abstract

The invention relates to a multistage Stirling engine and a steady-state operation parameter regulating and controlling method thereof. According to the multistage Stirling engine, multiple Stirling work units are formed by mechanical energy input pistons, mechanical energy transferring double-acting free pistons and mechanical energy output pistons. The mechanical energy input pistons are connected with mechanical energy input devices, and the mechanical energy output pistons are connected with mechanical energy output devices. When the Stirling engine serves as an engine, small mechanical energy is input into the mechanical energy input pistons in one group of pistons, and after the mechanical energy is amplified by the multi-stage Stirling units, large mechanical energy is output by themechanical energy output pistons. According to the multistage Stirling engine and the steady-state operation parameter regulating and controlling method thereof, a needed piston motion manner is achieved through parameter calculation, selection and designing, and therefore the multistage Stirling engine can adapt to the change of the input conditions and regulate the output power according to needs. The multistage Stirling engine is simple in structure, good in regulation performance, small in mechanical loss, small in noneffective volume and suitable for adopting large-diameter pistons, andcan be widely used for waste heat power generation and distributed energy and renewable energy power generation.

Description

technical field [0001] The invention belongs to the field of Stirling machines, and in particular relates to a multi-stage Stirling machine and a method for adjusting and controlling its steady-state operating parameters. Background technique [0002] Adopt the Stirling engine of double-acting free piston in the prior art (as attached figure 1 As shown), multiple identical pistons are connected to each other through radiators, regenerators, and heat absorbers to form multiple identical Stirling working units, and the mechanical energy and reciprocating motion between the pistons form a circular cycle transmission between the pistons. There are several deficiencies in this double-acting free-piston Stirling machine: the one is that each double-acting free-piston needs to output part of the mechanical energy to the outside, and the parts for outputting mechanical energy will increase the complexity of the equipment; The connection needs to be equipped with connecting parts su...

AI Technical Summary

Problems solved by technology

There are several deficiencies in this double-acting free-piston Stirling machine: the one is that each double-acting free-piston needs to output part of the mechanical energy to the outside, and the parts for outputting mechanical energy will increase the complexity of the equipment; The connection needs to be equipped with connecting parts such as elbows and gas collecting pipes. The connecting parts will increase the invalid volume of the large-diameter Stirling unit and the difficulty of manufacturing; third, the pressure difference of gases in different enclosed spaces cannot be used to bear the weight of the piston, and a spring is required. The dead weight of the piston and the balance position of the control piston; the fourth is that the control of the piston movement process is difficult and the adjustability is poor; Pulling the engine cannot achieve a balance between large-scale and manufacturing costs. Generally, the diameter and stroke of the piston of a Stirling engine have a certain proportional relationship. Enlarging the diameter of the piston requires increasing the stroke of the piston, and increasing the stroke of the piston will cause gas Adverse effects such as increased flow resistance limit the enlargement of the Stirling engine, and the unit cost of the Stirling engine cannot be reduced through enlargement

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