Patent CA-2866954-A1 (CA)
Inventor: VOGT SEBASTIAN
IPC: F01B11/00
Filed: 2014-10-09
Abstract: The invention relates to a compressed gas motor (1) comprising a working plunger (12), an internal space that is closed on a rear side and has the working plunger (12) arranged in it such that the working plunger (12) is mobile in linear direction, a restoring element (22) that exerts a force on the working plunger (12), at least part of the time, in the direction of the rear side, a gas inlet opening (24) for supplying a compressed gas into the internal space and a gas outlet opening (26) for discharging the gas from the internal space, whereby a control plunger (14) is arranged in the internal space between the working plunger (12) and the closed rear side such as to be mobile in linear direction, whereby the control plunger (14), in a first position, covers the gas outlet opening (26) and does not cover the gas inlet opening (24) and, in a second position, covers the gas inlet opening (24) and does not cover the gas outlet opening (26), the control plunger (14) is supported as in a bearing such as to be mobile with respect to the working plunger (12), and a catch element (18, 20, 42) is arranged on said working plunger (12) and/or control plunger (14) and pulls the control plunger (14) in the direction of the working plunger (12), at a first distance, when the working plunger (12) moves away from the control plunger (14), as well as a lavage system comprising said compressed gas motor (1). The invention also relates to a method for generating a periodical motion with a compressed gas, in which the working plunger (12) and the control plunger (14), in a starting state, are situated in the internal space such as to be at the first distance from each other, whereby the control plunger (14) closes the gas outlet opening (26) and the gas inlet opening (24) between the working plunger (12) and the control plunger (14) is open; the compressed gas is supplied into the internal space between the working plunger (12) and the control plunger (14); the pressure of the compressed gas accelerates and moves the working plunger (12) in the direction of a front side of the internal space away from the control plunger (14), whereby the distance between working plunger (12) and control plunger (14) increases; the control plunger (14) is pulled along by the working plunger (12) by means of the catch element (18, 20, 42), preferably as soon as the second distance is reached; the control plunger (14) closes the gas inlet opening (24) due to the motion of the control plunger (14); the control plunger (14) opens the gas outlet opening (26) due to the motion of the control plunger (14); the restoring element (22) accelerates the working plunger (12) in the direction of the rear side of the internal space; the compressed gas flows between the working plunger (12) and the control plunger (14) through at least one gas-permeable opening through the control plunger (14) into the space between the rear side of the control plunger (14) and the rear wall of the internal space; the compressed gas in the space between the rear side of the control plunger (14) and the rear wall of the internal space is released to the surroundings through the open gas outlet opening (26);  the working plunger (12) hits against the control plunger (14) and moves it in the direction of the rear side of the internal space; the gas outlet opening (26) is closed again by the reverse motion of the control plunger (14); and the reverse motion of the control plunger (14) opens the gas inlet opening (24) again such that compressed gas is again supplied into the internal space between working plunger (12) and control plunger (14).