Refrigeration – Processes – Assembling – charging – or repairing of refrigeration producer
Patent
1990-07-24
1991-11-26
Tapolcai, William E.
Refrigeration
Processes
Assembling, charging, or repairing of refrigeration producer
62292, F25B 4500
Patent
active
050673254
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and apparatus which will enable the use of a piston compressor pump in pumping preferably refrigerants of low boiling points, either in a liquid or a gaseous state, for instance freons, from a first refrigerant circuit or container to a second refrigerant circuit or container.
BACKGROUND PRIOR ART
The developments of refrigerators and freezer systems have resulted in the extensive use of different types of freons as the refrigerating medium. When repairing and scrapping small refrigerating and freezer systems recovery of the refrigerant has been ignored, since there is no method by means of which the refrigerant can be recovered easily and quickly and at relatively low costs. Instead, these freons have been quite simply released into the atmosphere. In the case of larger systems, attempts have been made, in comparable situations, to recover as much of the refrigerant as possible, with the aid of relatively expensive and unmanageable pistonless compressor pumps.
The recently recognized fact that freons have a harmful effect on the atmospheric protective ozone layer encircling the earth has led to a demand for a reduction in freon emissions into the atmosphere. This demand has led to the development of freon suction devices, or freon-exhausters, based on the use of piston compressors of the kind which are mass produced in large numbers, and therewith at relatively small costs, for use in conjunction with compressor driven refrigerators and freezers. These freon suction devices, however, are only suitable for extracting freon in gaseous form, since liquid freon cannot be compressed and consequently the compressor will be seriously damaged if liquid freon should enter a working piston compressor. Consequently, when emptying such refrigerating systems, which contain freon in both a liquid and a gaseous state in different parts of the system, it is recommended that the system is emptied from the gas side and that the liquid freon is permitted to pass to a gaseous state in the system during the process of emptying the system. Such an emptying process will take a long time to complete, however, and is not entirely safe, since there is always a risk that liquid freon will enter the pump and cause serious pump damage.
SUMMARY OF THE INVENTION
One object of the invention is to provide a method and apparatus which will enable a refrigerating system to be emptied quickly and safely from both the gas and the liquid side thereof. Another object is to provide less costly, readily handled and readily transported freon suction devices, by enabling such devices to be constructed with the aid of known, mass produced components. These objects are achieved in accordance with the invention by means of an inventive method and arrangement having the characteristic features set forth in the following detailed description.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be described in more detail with reference to the accompanying drawing, in which
FIG. 1 illustrates schematically an inventive method of pumping refrigerant from a refrigerating system to a container with the aid of a piston compressor pump, and
FIG. 2 is a side view which illustrates schematically alternative positioning of the main components of the inventive arrangement.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 1 illustrates schematically the inventive method of pumping refrigerant, e.g. freon, from a refrigerating plant or system 9, only part of which is shown, to a container 8, and the reference numeral 1 in said Figure identifies a broken line surrounding a pump arrangement which includes those components necessary for carrying out the method. In addition to a piston compressor pump 2 and an oil separator 3 associated therewith, these components also include a heat exchanger 4 which is provided with two chambers or pipe systems, 4A, 4B and a pressure reduction valve 5. One chamber 4A of the heat exchanger 4 is connected in the pipe or line through which refrigerant is deli
REFERENCES:
patent: 3232070 (1966-02-01), Sparano
patent: 3699781 (1972-10-01), Taylor
patent: 4261178 (1981-04-01), Cain
patent: 4363222 (1982-12-01), Cain
patent: 4476688 (1984-10-01), Goddard
patent: 4646527 (1987-03-01), Taylor
patent: 4862699 (1989-09-01), Lounis
patent: 4938031 (1990-07-01), Many et al.
Olsson Clas Ove
Tapolcai William E.
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