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[0001] The present invention relates to an improvement to an absorption-cycle refrigerating unit.
[0002] As is known, in absorption-cycle refrigerating units the refrigeration fluid is generally constituted by a mixture of water and ammonia that is heated in a boiler by way of the heat provided by an electrical resistor. The generated heat causes the evaporation of the ammonia, which separates from the water. As evaporation proceeds, the pressure increases until it is high enough to cause the condensation of the ammonia. According to what occurs in compression-cycle refrigerating units, the ammonia, through a valve, then expands in an evaporator, returning to the gaseous state and drawing heat from the surrounding environment (the inside of a refrigerator). The water, which now contains small quantities of ammonia, passes from the boiler into the absorber, through a heat exchanger, to which it transfers part of its heat. Here it mixes with the pure ammonia vapor that arrives from the evaporator and becomes saturated. A circulation pump returns the mixture of ammonia and water to the boiler through the heat exchanger, where the mixture absorbs the heat of the water that arrives from the boiler. The cycle can therefore resume in the described manner.
[0003] As is evident, in order to maintain a high efficiency of absorption-cycle refrigerating units it is crucial to limit the heat losses of the boiler and increase its efficiency.
[0004] The aim of the present invention is therefore to improve an absorption-cycle refrigerating unit that allows to achieve a higher inflow of calories to the boiler and therefore reduce the time required by the unit to reach the intended operating temperature, with corresponding triggering of the power-off device, or allows to use a less powerful electric resistor.
[0005] Within this aim, an object of the present invention is to provide an assembly in which the improvements that have been introduced have no appreciable effect on the cost standpoint of the unit.
[0006] This aim and this object are achieved according to the present invention with an absorption-cycle refrigerating unit, comprising an electrically heated boiler, characterized in that said boiler is covered with a layer of mineral wool that is covered by an external enclosure made of expanded plastic material.
[0007] Further features and advantages of the present invention will become better apparent from the description that follows of a preferred embodiment, illustrated only by way of non-limitative example in the accompanying drawings, wherein:
[0008]
[0009]
[0010]
[0011] With reference to the figures, the reference numeral
[0012] The reference numeral
[0013] The boiler
[0014] In the continuation of the description, the connections among the various components are not described, since they are fully conventional and unrelated to the present invention, whose particularities reside in the structure of the boiler.
[0015] As clearly shown in FIGS.
[0016] A layer
[0017] Conveniently, the tubular element
[0018] It should be noted that the thermally insulating layer
[0019] It is evident that the described improvement allows to achieve the intended aim and object. In particular, the arrangement of the layer
[0020] The described refrigerating unit
[0021] In another embodiment, the boiler
[0022] In the practical execution of the invention, the shapes and the dimensions may be any according to requirements.
[0023] The disclosures in Italian Patent Application No. BO2001A000613 from which this application claims priority are incorporated herein by reference.