Patent GB-677758-A (GB)
Title: Improvements in synchronising devices for rotary engines or compressors
IPC: F04C18/16
Filed: 1950-10-06
Abstract: 677,758. Rotary engines or compressors. AKTIEBOLAGET LJUNGSTROMS ANGTURBIN. Oct. 6, 1950 [Oct. 7, 1949], No. 24453/50. Class 110(ii) In an engine or compressor having a number of shafts adapted to be connected by synchronizing gears, or the like, and carrying co-operating rotors, at least one of the rotors is rigidly fixed to its shaft while each of the other shafts carries, at the most, one rotor rigidly connected to its shaft and at least one rotor adjustable angularly on its shaft. A compressor, Fig. 1, has rotors 9, 10, 11 fixed to their shafts 12, 13 but the rotor 8 is angularly adjustable. The rotors 8, 9 are first set by adjusting a toothed rim 15 on a gear wheel hub 14, rigidly connected with the shaft 12. The rotor 10 is then set with a predetermined clearance between its lands and the lands on the rotor 11 and is fixed in this position by a flange 19 rigidly connected with the end of the shaft 13 using stud bolts 20, a gear 18 being thus angularly adjustable with respect to the shaft 13. Gear 18 and rotor 8 are rigidly connected. The rotor pairs 8, 9 and 10, 11 form separate compressors with inlets at the outer ends and side-by-side delivery ports on each side of the packing 21. Air or liquid may be used in the cooling jacket. One rotor may have its lands located substantially outside its pitch circle (male rotor) and the other carry grooves which are substantially inside the pitch circle (female rotor), the latter being the rotor which is angularly adjustable. Fig. 4 shows an arrangement having rotors 27, 28 fixed on a shaft 26 and co-operating rotors 31, 32 fixed on shafts 29. 30 and rotors 33, 34 which are angularly adjustable on shafts 29, 30. Each of the rotors 33. 34 is first synchronized with the rotor 27 by means of toothed rims 36, 37 meshing with the gear wheel 35 and lockable in different angular positions relatively to gears 40, 41 and then the rotors 31, 32 are synchronized with the rotor,28 by locking the flanges 42, 43 fixed on shafts 29, 30 in desired angular positions to the gears 40, 41. In a further arrangement, Fig. 5' (not shown), two parallel shafts each have three rotors cooperating with rotors on the other shaft with fixed or adjustable rotors. The adjustment is secured as shown in Fig. 1. In Fig. 6 three shafts 63, 64, 65 each carry two rotors of which rotors 73, 74 are fixed on shaft 64, rotors 75, 76 are fixed on their shafts and rotors 77, 78 are adjustable. A gear 79, on shaft 64, meshes with adjustable toothed rims 84, 85 on gears 82, 83 fixed on hollow shafts 80, 81 of the rotors 77, 78. Rotors 77, 78 are synchronized with the rotor 73 as shown in Fig. 4, while rotors 75, 76 are synchronized with the rotor 74 through turnable bolts 87. Straight splines 89 and helical splines 90 on a sleeve 88, engage similar splines in the bore 91 formed in the rotor 77, and grooves in a bore 92 of the shaft 86, respectively. Lock nuts 93 hold the sleeve 88 relatively to the hollow shaft 80 and bolt 87 respectively. When the sleeve is displaced on the bolt 87, the rotor 77 is turned. Rotor 78 is similarly adjusted. Seals 94, 95, 96 are provided between the rotor sets.