Patent GB-210448-A (GB)
Title: Refrigerating plant of the absorption type
IPC: F25B17/02
Filed: 1924-01-25
Abstract: 210,448. Amundsen, I. Jan. 29, 1923, [Convention date]. Refrigerating, absorption machines for. - A machine working on the reversing system and comprising a generator-absorber u, condenser s and evaporator t is controlled automatically by an electromagnetic device g according to the level of liquor in the generator-absorber or to the level of a liquid such as mercury in a vessel communicating with the generator-absorber. The device controls the heating means, such as an electricl heater c or a gas heater, and asso controls, through a device A, Fig. 1, the flow of cooling-water from the condenser tank through a coil in or a jacket around the generator-absorber a. Electrodes h1, h2, Fig. 2, embedded in an insulated block i are immersed in liquor in a part of the generator-absorber where a quiet surface is maintained by a perforated partition p. Current passes from a main switch b to the heating element c and to a pivoted contact arm e, which - when raised closes a circuit through a device k in the cooling-water circuit. A secondary circuit from the switch b.passes around an electromagnet g to one of the immersed contacts h1, and back through the liquor and the other immersed contact. The action is such that towards the end' of the generating period the liquor no longer completes the circuit between the electrodes h1, h2 and the armature m of the electromagnet drops and allows the arm e to break the circuit through the heating element and the device k. The condenser water now flows through or around the generator-absorber to cool the weak liquor. At the end of the absorption period the level of the liquor rises to a horizontal part of the immersed electrodes and the current then flowing through the liquor is sufficient to raise the armature m and the arm e. The cooling-water is thereupon diverted to the waste outlet without passing through the generator-absorber, and the heating is recommenced. A suitable water-control device comprises an electromagnet k, Fig. 3, adapted during the heating period to attract an armature q and thereby close the pipe y leading tn the cooling-system of the generatorabsorber and open the waste pipe z, the water being directed through the pipe y during the absorption period. The conductivity of the liquor may be modified or made stable by the addition thereto of a neutral agent such as calcium chloride. The Specification as open to inspection under Sect. 91 (3) (a) comprises the following subjectmatter :-The electromagnetic control is applied to absorption apparatus having three immersed electrodes reaching to different levels in the liquor and means for cutting-off the current to the heating-means by the over-filling of the condenser tank when reversal is delayed, as described in Specification 220,592. The gas returning from the evaporator during the absorption period is directed into the liquor through an injector device to entrain with it any unabsorbed gas. or the single-flow and return gas pipe may have a branch above the liquor fitted with a non-return valve. The evaporator comprises a part immersed in a. brine tank and an upper heat-insulated part, the lower part containing a solid filling-member to maintain a high level of liquefied refrigerant. The brine tank may be fitted with baffles. Alternatively, the evaporator may consist of two vessels, or a vessel of varying cross-section. This subject-matter does not appear in the Specification as accepted.