Patent GB-414067-A (GB)
Title: Means for preventing superheating in apparatus for the continuous treatment of liquids
IPC: A01J11/00
Filed: 1933-01-23
Abstract: 414,067. Pasteurizing and centrifuging milk &c. AKTIEBOLAGET SEPARATOR, 8, Fleminggatan, Stockholm. Jan. 23, 1933, No. 2126. Convention date, Sept. 15, 1932. [A Specification was laid open to inspection under Sect. 91 of the Acts, July 24, 1933.] [Class 49.] In continuously operated apparatus for the pasteurization, centrifuging or other treatment of liquids, means are provided, responsive to the flow of the liquid, for automatically supplying a cooling liquid to the apparatus to prevent overheating when the normal supply of the liquid is interrupted or reduced. The cooling liquid may be the treated liquid, or another liquid such as water from the main. In one form, the pipe 2, Fig. 1, through which milk is supplied by a pump 1, to a centrifuge 3, is conneoted by a pipe 7 to a cylinder 8 in which is a piston 9 which operates valves 10, 11 in pipes 12, 13 connected to the cream and skim milk outlet pipes 4, 5 respectively. When the pressure in pipe 2 falls, the piston 9 descends, under the influence of a weight 15, opening valves 10, 11 so that separated liquid is supplied through a funnel 14 and pipe 6 to the pump 1 and pipe 2. In a modification, Fig. 2, the skim milk is fed to a tank 16 with an overflow outlet 20, the valve 11 being operated on fall of pressure in the supply pipe 2 to supply the skim milk through a pipe 17 and a cooler 18 to the pump 1. A valve 19 may be provided in the cream outlet 4 and operated by piston 9 to shut the cream outlet 4 when the valve 11 is opened, or the outlet 4 may be connected to a container from which the cream may be withdrawn for use in cooling. A pasteurizer 45 and a heat exchanger 44 may be included between pipe 7 and the centrifuge 3, or between the pump 1 and pipe 7, or after the centrifuge, or so that the milk flows through in turn the heat-accumulating part of the preheater, the centrifuge, the pasteurizer and the heat transmitting part of the preheater. In a further form, Fig. 3, milk is supplied by a pump 1 to a pasteurizer 50 the outlet 49 of which has a valve 48 operated on fall of pressure in the milk supply pipe by piston 9 to divert the milk to a container 46 from which it is returned to the pump 1 through a pipe 6 and a valve 47 which is actuated with valve 48 by piston 9. The container 46 is connected to a water pipe by a tube 52 with a valve 53. The valves controlling the return of the liquid may be formed in one with the operating means therefor. In one form, a rubber membrane 21, Fig. 4, is secured between members 22, 23 and is influenced on its upper side by the pressure in the liquid supply pipe 2 of the centrifuge 3, to which it is connected by a channel 24 and a pipe. The lower side of membrane 21 rests on and closes a nozzle 27 connected to the skim milk outlet pipe of the centrifuge, and is influenced by a spring 25 which presses a member 26 against the membrane so that when the pressure in the supply pipe 2 falls the membrane 21 is raised and the nozzle 27 is connected to a channel 29 in communication with the inlet side of the pump 1. In another form, in which both cream and skim milk are returned, the valve comprises a conical member 30, Fig. 6, of rubber which may be strengthened by a solid filler 37 and which is kept pressed on three grooves in a conical valve seating 34 by the pressure in supply pipe 2 communicated through a channel 35. The grooves are connected respectively to the skim milk and cream outlets and to a tube running to pump 1, so that when the pressure in pipe 2 falls the member 30 will be raised by a spring 38 and the grooves placed in communication to return the skim milk and cream to the pump. The conical member 30 may be replaced by a sliding member which has a groove by which the communication between the outlets and the pump is established. The Specification as open to inspection under Sect. 91 comprises also non-automatic supply of the cooling liquid, for example by connecting the skim milk outlet pipe 5 of the centrifuge to the inlet of the pump 1 by a pipe through which part of the skim milk is returned to the pump. This subject-matter does not appear in the Specification as accepted.