Refrigeration – Refrigeration producer – Compressor-condenser-evaporator circuit
Patent
1997-10-16
1999-04-06
Tapoical, William E.
Refrigeration
Refrigeration producer
Compressor-condenser-evaporator circuit
62527, F25B 4106
Patent
active
058903755
DESCRIPTION:
BRIEF SUMMARY
The invention refers to an arrangement at an evaporator, e.g. in a domestic refrigerator, for refrigerating air in a space, which is confined against ambient atmosphere by a wall, the evaporator, which is part of a compression refrigerating circuit, being constituted by a tubular element, through which a refrigerant flows from a capillary pipe included in the circuit, which pipe is connected to the element at a joint at one end of the element.
At such an evaporator the joint uses to be located in the space. If a leakage arises in the joint, the refrigerant in the circuit will leak out into the space, which at a domestic refrigerator communicates with a goods compartment closed by the door of the refrigerator, in which compartment goods are stored in the refrigerator. If the refrigerant is inflammable and has leaked out through the joint into the goods compartment closed by the door, the refrigerant forms with the air in the goods compartment a gas mixture, which by an electric spark from some electric component in the goods compartment can be brought to explode.
The object of the invention is to arrange the joint such, that refrigerant possibly leaking out through it will not enter the goods compartment.
This object is reached by the arrangement according to the invention by the tubular element comprising an inner tube, through which the refrigerant flows, that an outer tube is arranged on the outside of the inner tube, that at said one end of the element the outer tube extends through the wall and that the joint is arranged between the capillary pipe and the inner tube, the joint being located inside the wall in a chamber formed in the outer tube, and that a sealing means is arranged between the capillary pipe and the outer tube for preventing humidity of the ambient atmosphere from forcing its way into the chamber.
By the sealing means humidity from the ambient atmosphere is prevented from forcing its way into the chamber and there form ice, which can damage the outer tube and the joint.
Embodiments of arrangements according to the invention are described below in connexion with the enclosed drawings, in which FIG. 1 shows a first embodiment of an evaporator arranged in a space, FIG. 2 shows an enlargement of a longitudinal sectional view of a part II in FIG. 1, FIG. 3 shows an enlargement of a sectional view according to the marking III--III in FIG. 1, FIG. 4 shows in the same sectional view as FIG. 2 a second embodiment of the evaporator, and FIG. 5 shows in the same sectional view as FIG. 2 a third embodiment of the evaporator.
With reference to FIG. 1 10 designates an evaporator for refrigerating air in a space 12 in a domestic refrigerator, which space communicates with a not shown compartment for storing goods in the refrigerator and is confined against ambient atmosphere 14 by a wall 16: The evaporator 10 is part of a compression refrigerating circuit, which shows a tubular element 18, through which a refrigerant flows from a capillary pipe 20. The element 18, which is provided with surface-enlargening flanges 22, is constituted by an inner tube 24 and an outer tube 26. The refrigerant flows through the inner tube 24, which runs inside the outer tube 26 from a joint 28 with the capillary pipe 20 to a joint 30 at the outlet of the evaporator 10. The ends of the outer tube 26 run at as well the inlet 32 of the evaporator as at its outlet 34 through the wall 16.
At the joint 28 the diameter of the end of the tube 24 is reduced, so that the capillary pipe 20 can be inserted into the tube 24 and become connected to it by a solder in the gap between the pipe and the tube. The joint 28 is located in the space 12 inside the wall 16, so that the absorption of heat by the refrigerant at the joint 28 is taken care of for refrigerating the air in the space 12. In order to prevent humidity from ambient atmosphere to force its way to the joint 28 and form ice there, which can cause frost bursting, a sealing plug 36 is arranged between the capillary pipe 20 and the tube 26. If a leakage would occur in the joint
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St.ang.hl Mauri
Wedby Per
Aktiebolaget Electrolux
Tapoical William E.
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