Patent GB-372811-A (GB)
Title: Improvements in or relating to fluid treating apparatus
IPC: A23L3/16
Filed: 1931-02-06
Abstract: 372,811. Milk pasteurizing and other fluid treatment apparatus. PFAUDLER CO., 89, East Avenue, Rochester, New York, U.S.A.-(Assignees of Jacobsen, J. N. ; 563, Arnett Boulevard, Rochester, New York, U.S.A.) Feb. 6, 1931, No. 3829. Convention date, Oct. 14, 1930. [Class 49.] Apparatus for use in the treatment of fluids, more particularly for pasteurizing milk, comprises one or more tanks having filling and emptying mechanism for the fluid, and devices for introducing a washing liquid into each tank controlled by means including an electric circuit, operating the devices automatically after each emptying of the tank. In the construction described, a series of holding tanks 30, Figs. 1 and 3, for the milk is provided with a common controlling means for operating the filling and emptying mechanism and the means for introducing washing liquid. Each tank has a milk inlet connection 31 and discharge connections 36, 35 and a spray means 81 for supplying the washing liquid together with outlet means for the liquid which is kept open until after the spray is cut off, and a conduit 43 for connection to vacuum when filling with milk and to pressure whilst discharging and having a float valve 44, all constructed as described in Specification 372,810. The conduits 43 are led to a master control valve 40, Figs. 12 and 14, which has a rotatable valve plug 41 having a port 51 connected to a pressure source through a conduit 55 and a port 53 connected to a vacuum source through a conduit 56. The ports 51, 53 register in succession with ports 42 on the valve body, to which the conduits 43 are connected, to effect emptying the milk from and filling it to the tanks. The port 53 has an extension 53a to allow it to remain longer in connection with a port 42 than the port 51 to ensure the filling of the tanks. The mechanism for rotating the plug 41 comprises a worm 52, driven by an electric motor, meshing with a worm wheel 63 the shaft of which carries a worm meshing with a worm wheel 65 to which is secured a pinion 66 meshing with a gear 67. On the shaft of gear 67 is a gear 68 having teeth around half only of its periphery which mesh with a gear 69 of half the diameter, so that gear 69 is turned through a complete revolution during half a revolution of gear 68 and remains idle during the other half. Gear 69 is attached to and rotates a shaft 70 to which is attached a gear 71 engaging a gear 72 secured to the plug 41. The gear 71 has a toothed portion 73, Fig. 13, which engages in turn with toothed portions 75 corresponding to the tanks, on the gear 72. Looking portions 76 between the toothed portions 75 engage with the smooth portion 74 of the gear 71. On each revolution of the gear 71, gear 72 is turned through one-fifth of a revolution thus displacing the plug ports 51, 53 forward one step to bring a fresh pair of tanks into connection with the filling and emptying means, the mechanism being timed so that the milk is held in each tank for about 30 minutes before discharge. The spray valve 80 of each tank is actuated by a solenoid 140, Fig. 3, having a plunger 141 pivoted to the block to which the sliding valve member is attached. The discharge valve for the washing liquid is operated by a solenoid 150 having a plunger 151 which is pulled upwards on energization of the solenoid and actuates the bell crank 154 connected through rod 158 to the stem 133 of the valve. The valve is closed on deenergizing the solenoid by the weight of the plunger 151 and a weight 160 on the bell crank 154. A control box 170, Figs. 12, 18, and 20, is provided having five pairs of switches, each comprising an upper switch 171 for the spray valve solenoid 140 and a lower switch 172 for the discharge valve solenoid 150. Each switch has an actuating plunger 173, 174 projecting into the path of a control cam 175 secured to a shaft 176 rotated through gear 177, 178 from shaft 70 so that the shaft 176 is rotated one-fifth of a revolution for each revolution of shaft 70. The cam 175 has a cut-out portion 182 which enables the switch 171 to return to the inoperative position before switch 172, the cam 175 being held in this position, the discharge valve being thus kept open during the rest period for the tank.