GB417630A - Improvements in temperature regulating systems - Google Patents

Abstract

417,630. Electrically-actuated valves. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Vapor Car Heating Co., Inc. ; 80, East Jackson Boulevard, Chicago, U.S.A.) Nov. 25, 1933, No. 33060. [Class 135.] A temperature regulating system wherein in each of several compartments X, Y, Z thermostatic devices A, A<1>, A<11> comprising several thermometers 103, 104, 105 are provided, each thermometer being adapted to make a contact at a particular temperature and there also being provided in each compartment a selector 110 to connect one of the thermometers in a circuit to a relay which in turn energizes an actuating means for a valve controlling the flow of heating fluid to the compartment. Mounted upon a panel C are relays D, D<1>, D" which are connected to the thermostatic devices A, A<1>, A<11> respectively and operate solenoid motors B, B<1>, B<11>. Upon contact taking place of one of the thermometers selected by the arm 110 in a compartment, the solenoid 87 of a relay is short circuited and the core 88 falls allowing the contacts 93, 94 to be bridged by the plate 90 and thus energizing solenoid 130 to close the valve 124. A switch 136 is moved after the valve is closed to break the circuit to the solenoid 130 and make a circuit to the solenoid 131 in readiness for the next operation which occurs when the temperature falls and the solenoid 87 is energized and the contacts 91, 92 are bridged and the solenoid 131 is energized to open the valve. The source of power is derived from a battery H and a generator J, which in the case of a railway vehicle is driven from the axle 2, arranged in parallel and a switch 10 being adapted to close only after a solenoid 13 is sufficiently energized. The circuits between the thermostats A, A<1>, A<11> and the relays D, D<1>, D<11> are fed by current controlled by the voltage regulator K comprising a rheostat 29, the pressure on which is adjusted by the solenoid 39. The regulator K also controls the current to the lamps L for lighting the compartment. The circuits between the relays D, D<1>, D<11> and the actuating mechanism B, B<1>, B" are supplied direct by the battery, generator combination. Should the current taken by the devices B, B<1>, B<11> be excessive or the time of action prolonged, then a strip 75 is warped and the circuit broken and an indicating lamp 85 is illumined. Switches 148 are fitted to each relay so that each circuit may be broken. A switch arm 159 is actuated by a Bourdon tube 153 connected to a pressure line in which the pressure is released when the railway vehicle is uncoupled. When the pressure is released the contacts 156, 157, 158 are bridged and solenoid E energized to make the contacts 173, 174 so that whatever the position of the switches 148 or the selectors 110, the valves of all compartments are controlled to maintain a minimum temperature.