Elektrodynamischer Vibrator-Kompressor

摘要

1,185,755. Reciprocating motors. PHILIPS' GLOEILAMPENFABRIEKENN.V. 20 March. 1968 [23 March, 1967], No. 13474/68. Heading H2A. [Also in Divisions F1 and F2] In an electrically driven compressor having an assembly including a piston 9 and a coil 13 disposed in the field of a permanent magnet 1, whereby A.C. energization of the coil causes the assembly to vibrate against the action of a spring 17, the spring 17 is connected to the assembly by a rod 16 and its effective length is adjustable by altering the position it is secured to fixed rods 18. The spring is in the form of a strip secured at its centre part 19 to the rod 16 and having each end part bent into a spiral. The extreme end of each spiral is provided with an arcuate loop 20 having a centre coincident with the rod 16. By rotating the spring the fixed rods 18 can be secured to the loops 20 at any point along their length so that the frequency of natural vibration of the assembly can be adjusted to correspond with the A.C. supply.