Patent GB-354569-A (GB)
Title: Improvements in the regulation of the heat supply to absorption refrigerating apparatus
IPC: F25B49/04
Filed: 1930-08-27
Abstract: 354,569. Refrigerating thermostats. ELECTROLUX, Ltd., 153, Regent Street, London.-(Assignees of Platen-Munters Refrigerating System Aktiebolag ; 2, Norrmalmstorg, Stockholm.) Aug. 27, 1930, No. 25623. Convention date, Aug. 27, 1929. [Classes 29 and 64 (ii).] Absorption machines.-In machines particularly for domestic use and heated by petrol, methylated spirit or like liquid fuel, the course of the heating gases is changed automatically by a thermostat subject to the low temperature of the evaporator or cooling body in the cabinet, and it may be also to the high temperature of heat delivering parts, so that the generator receives heat only when required, although the burner operates continuously. Reduction of pressure of the cooling- water of the apparatus may also effect the change, either alone or additionally to the thermostatic control. As shown in Fig. 1 a spherical burner reservoir 18 is tiltably mounted in brackets 17 and is moved to divert the flames away from the heating flue 14 of the generator 12 of the apparatus when a sufficiently low temperature prevails in the cabinet 10. Preferably a thermostat having a feeling member filled with water &c. which expands and transmits pressure on freezing is used. The pressure is transmitted through a tube 28 to a chamber around a bellows member 32 connected by a plunger 29 and links &c. 26, 25 to the burner reservoir, the parts being returned to normal by a spring 30. An asbestos or a heat conducting protective plate 32 is arranged to receive the flame in the idle position of the burner, and may divert the hot gases to a flue. Instead of employing a movable burner, the plate 32 may be moved, or a flap or valve in a byepass flue may be controlled. The combination of thermostatic and cooling- water pressure control is shown in Fig. 4 as applied to a continuous-cycle inert gas machine comprising a generator 45, rectifier 48, condenser 49, absorber 64 and evaporator 56. The capsule 60 of the thermostat is adjustably clamped to a body 58 on the evaporator and is connected by a tube 73 to a pressure chamber containing a bellows member and valve 76 adapted to close the cooling-water inlet pipe 79 when the desired low temperature is reached. When the temperature rises the valve opens and the water then flows through a reducing valve 87, controlled by the water pressure acting on a diaphragm 85, a restriction device 89 and on through the cooling pipe 50 around the absorber and condenser. The water also flows through a pipe 90 to a diaphragm chamber 91, and so long as its pressure is maintained a plunger 93 supports a pivoted burner reservoir 98 in the normal raised position. On failure of the water supply or on the creation of pressure in the tube 73 due to freezing of the medium in the thermostatic capsule the weight of the burner and reservoir forces the plunger 93 downwards and the flame is moved away from the generator. The conduit 73 may be led past heat delivering parts such as the rectifier so that a pressure is developed in it on overheating, and the burner is thereby automatically moved to the idle position. In the idle position the burner may heat a liquid to create a pressure for returning it to effective position when the cooling-water again flows. Specifications 322,188 and 332,655, [both in Class 64 (ii), Heating systems &c.], are referred to. The' Specification as open to inspection under Sect. 91 (3) (a) comprises also the application to apparatus heated by gaseous fuel of variable pressure. This subject-matter does not appear in the Specification as accepted.