Stirling engine comprising a cooling tube on a working cylinder

Abstract

A Stirling engine comprising: a crank case (1) with a crank shaft (2) arranged therein, a displacer cylinder (3) with a reciprocatingly arranged displacer piston (4) therein, said displacer piston (4) being connected to said crank shaft (2) via a connecting rod (5) extending through a first end of said displacer cylinder (3), and wherein the displacer cylinder (3) defines a hot chamber (6) and a cool chamber (7) separated by the displacer piston (4), a working cylinder (8) defining a working cylinder chamber (11) with a reciprocatingly arranged working piston (9) therein, said working piston (9) being connected to said crank shaft (2) via a connecting rod (10) extending through a first end of the working cylinder (8), a heater device (14), arranged at a second end of said displacer cylinder (3) opposite to said first end and configured to heat a working gas which is present in the hot chamber (6) of the displacer cylinder (3) and in fluid communication with the working cylinder chamber (11) through a working gas channel which comprises a first heat exchanger (16) extending from a cylinder head (19) of the displacer cylinder (3) into the heater device (14), a second heat exchanger (17) formed by a regenerator arranged outside the heater device (14), and a transition flow element (22) provided between said second heat exchanger (17) and the working cylinder (8), wherein the Stirling engine also comprises a cooling system for cooling of the displacer cylinder, the working cylinder and the tubular transition flow element. The Stirling engine comprises a first outer tube (30) arranged outside and enclosing the working cylinder (8), and the cooling system comprises a first channel (31) configured to receive a cooling fluid and defined by the outer periphery of the working cylinder (8) and the inner periphery of said first outer tube (30), and said channel (31) covers at least 50% of the outer peripheral surface of the working cylinder (8).

Dependencies are inferred from the claim text.