Patent GB-859338-A (GB)
Title: Improvements in or relating to a method of mixing liquids having a variable output and constant proportions and a metering and mixing device for carrying out the method
IPC: G05D11/00
Filed: 1957-05-02
Abstract: 859,338. Mixing liquids in flow. CORVISIER, L. R. May 2, 1957 [May 7, 1956(2)], No. 14001/57. Class 86 [Also in Group XXVI] In a metering and mixing device for obtaining a variable output liquid mixture wherein the liquids have constant relative proportions, liquid flowing in a main duct 2, Fig. 1, drives a hydraulic motor 1 which, through gearing 5, drives a pump 3 in a pipe 4 for a secondary liquid, the pump 3 driving through gearing 7 a metering pump 6 connected in series with it by a pipe 8 and delivering the secondary liquid through a pipe 9 and non-return valve 12 to the main duct 2. The output of the pump 3 is greater than that of the pump 6 and the pump 3. is provided with a by-pass having a limit valve 11 under the urge of a spring, the stroke of the valve being limited by abutment means (not shown) responsive to the pressure of the liquid in the main duct 2. Referring to Figs. 3 and 4. the motor 1 comprises a casing 14 in which rotate lobed wheels 23, 23<SP>1</SP> mounted on shafts 26, 26<SP>1</SP>, the casing being provided with coaxial tubular parts 15, 15<SP>1</SP> in which are rotatably mounted sleeve members 16, 16<SP>1</SP>. The members 16, 16<SP>1</SP> are formed with bores which at the outer ends 19, 19<SP>1</SP> are of circular crosssection whilst at the inner ends 20, 20<SP>1</SP> are substantially rectangular in cross-section. The intermediate cross-sections of the sleeve bores are generally oval in shape. By rotating one of the sleeves 16, 16<SP>1</SP>, the output of the motor 1 may be varied. The casing 14 is provided with end casings 29, 30 for synchronizing gears 33, 33<SP>1</SP>, for the wheels 23, 23<SP>1</SP> and gears 39, 40, for the pump 3, -respectively. Between the casing 30 and an outer casing 48, 49 is arranged a double casing 36 (see Fig. 5) for the pumps 3, 6, the cover 49 of the outer casing, covering gears 42, 43 (only 42 being shown in Fig. 3) for driving the pump 6. As shown in Fig. 9, the gears 33, 33<SP>1</SP> are mounted on the shafts 26, 26<SP>1</SP> and the gear 40 mounted on the shaft 26<SP>1</SP> drives the gear 39 mounted on a shaft 41 of one gear 37 of the pump 3. The other gear 37 mounted on a shaft 45 drives the gear 43 which drives the gear 42 mounted on a shaft 44 carrying one gear 38 of the pump 6. Referring to Figs. 3 and 5 the two gear pumps 37, 37 and 38, 38 are connected in series with a suction inlet 46 and an outlet 47. The pump 3 is provided with a by-pass formed by passages 51, 53 and a valve 55 corresponding to the valve 11 in Fig. 1, the spindle of which abuts the spindle of a piston 56a movable in a cylinder 56b connected by a pipe 56c with the main duct 2. Surrounding the guide for the valve spindle is a collar 59 and between the latter and the valve 55 is mounted a spring 56, the force of which can be regulated by an adjusting lever 58 as described with reference to Fig. 8 (not shown). The outlet 47 is connected by a pipe 9 with the sleeve 16<SP>1</SP> through the non-return valve 12 whilst the inlet 46 is connected with the secondary liquid pipe 4. The shaft 26 is provided with an extension 26a whereby the motor 1 may be turned by a crank when necessary, the extension being provided with a cover 29<SP>1</SP>. The secondary liquid system may be rinsed clean by connecting, at will, the inlet 46 to the duct 2 on the upstream side of the motor 1, through a valve which normally connects the pipe 4 with the inlet 46. This rinsing control valve is operable by a hydraulically operated piston controlled by a solenoid-operated pilot valve as described with reference to Figs. 11 and 12 (not shown). The motor 1 may be lubricated by oil sprayers 90, 90<SP>1</SP>, Fig. 4, fed with oil by a pump (not shown).