GB912670A - Improvements relating to hydraulic turbo couplings - Google Patents

Abstract

912,670. Hydraulic couplings. SINCLAIR, H. Sept. 1, 1960 [Sept. 7, 1959], No. 30518/59. Addition to 799,234. Class 69 (2). The valve 30 responsive to a decrease in filling of the working circuit of the hydraulic turbo coupling described in the parent Specification to increase the rate of the restricted flow therefrom is modified and comprises a first float 37 coupled to a valve member 33 and movable relative to the coupling axis to actuate the member in accordance with the radial depth of liquid in the reservoir chamber 11, and a second float 39 also coupled to the valve member and movable in a float chamber in which, while the coupling is in operation, liquid is maintained at a substantially constant depth. The working circuit is formed by a casing 4 secured to an impeller 1, input shaft 8 and the reservoir 11, and contains a runner 9 secured to an output shaft 10. Liquid discharged from the working circuit through leak-off nozzles 21 and the valve 30 passes to the reservoir chamber 11 from which it is conveyed by an adjustable scoop tube 15 to a cooler and returned to the working circuit through a duct 22, chamber 24 and ports 25. More than one valve 30 may be provided and each consists of a member 33 controlling orifices 40A, 40B, 40C in a cylinder 32 and connected by a rod 34 to a disc 35 secured to the first float chamber 37, which is of annular form, and to the second float chamber 39 which is disposed in the chamber 38. The cylinder 32 is secured to a second cylinder 31 disposed between the easing 4 and reservoir 11 and formed with ports 41 . . . 44. During normal operation with the working circuit full and the scoop tube 15 in its radially-outermost position, the liquid in the working circuit can pass through the leak-off nozzles 21 and through a restricted path consisting of ports 45, 46 to the interior of the cylinder 31 and through ports 41 . . . 44 to the reservoir chamber. Some liquid passes through ports 36 in the plate 35 to fill the chamber 38. The liquid in the reservoir chamber 11 is of insufficient depth during normal operation to move the member 33 from the position shown so that the orifices 40A, 40B, 40C are closed. When the scoop tube is moved to empty the working circuit, the increased depth of liquid in the reservoir chamber acts on the float 37 to move the member 33 and successively open the orifices 40A, 40B, 40C to increase the flow from the working circuit to the cooler. In an alternative embodiment, the member 33 and cylinder 32 are replaced by a conical member cooperating with a hole in a disc.