公开(公告)号：US20220145847A1

公开(公告)日：2022-05-12

申请号：US17310621

申请日：2020-02-18

申请人： Flapump AS

发明人： Jostein Fladby ,  Trygve Fladby ,  Sissel Fladby van Woensel Kooy

IPC分类号： F03C1/013 ,  F15B15/14 ,  F15B13/02 ,  F04B9/105

摘要： A fluid-driven linear motor comprises a cylinder (5), a piston (4) and a piston rod (3) connected to the piston (4), wherein the two sides of the piston (4) in the cylinder (5) are alternatively supplied with fluid from a slide valve arrangement, the slide valve arrangement including a slide (9) accommodated in a chamber and which is shifted between its end positions controlled by a pilot rod (22) coaxially mounted in a through bore (12) in the slide (9). The pilot rod (22) is adapted to alternately set the through bore (12) in fluid connection with the ends of the slide (9) when the piston (4) is located in its end positions. The pilot rod (22.) is provided with an extension rod (204) adapted to slide inside a bore (203) inside said piston (5) and said piston rod (3), so that the stroke length of the linear motor can be extended. Moreover, a pressure chamber (209) is provided at the distal end of the pilot rod (22), said pressure chamber (209) being adapted to hold on the pilot rod (22) with a holding force when in its end positions until mechanical forces from the piston overcome said holding force.

公开(公告)号：US11441534B2

公开(公告)日：2022-09-13

申请号：US17310621

申请日：2020-02-18

申请人： Flapump AS

发明人： Jostein Fladby ,  Trygve Fladby ,  Sissel Fladby van Woensel Kooy

IPC分类号： F03C1/007 ,  F04B47/08 ,  E21B43/12 ,  F01B11/00 ,  F03C1/013 ,  F04B9/105 ,  F15B15/14 ,  F04D13/04

摘要： A fluid-driven linear motor comprises a cylinder, a piston, and a piston rod connected to the piston. Two sides of the piston in the cylinder are alternately supplied with fluid from a slide valve arrangement. The slide valve arrangement includes a slide and a pilot rod adapted to alternately set a through-bore of a slide in fluid connection with the ends of the slide when the piston is located in its end positions. The pilot rod is provided with an extension rod adapted to move inside a bore of the piston and the piston rod, so that the stroke length of the linear motor can be extended. A pressure chamber is provided at the distal end of the pilot rod. The pressure chamber is adapted to hold the pilot rod with a holding force when in its end positions until mechanical forces from the piston overcome said holding force.