Refrigeration – Using electrical or magnetic effect – Thermoelectric; e.g. – peltier effect
Patent
1989-01-19
1990-10-09
King, Lloyd L.
Refrigeration
Using electrical or magnetic effect
Thermoelectric; e.g., peltier effect
62 33, 62 36, F25B 2102
Patent
active
049613200
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a conveying and storage device for thermosensitive products wherein one or several Peltier elements are provided for controlling the temperature of the storage chamber, tubular heat-conducting members or a one-piece heat-conductive molding being arranged on the plate of the Peltier element or elements on the side of the storage chamber, and wherein the plate of the Peltier element or elements on the housing side is constituted by finned heat-exchange members.
In particular, a conveying and storage container for pharmaceuticals or the like is involved wherein such containers are to operate without moving parts at surrounding temperatures of +40.degree. C. to 20.degree. C.
In order to provide temperature control for the storage chamber, one or several Peltier elements are used in the type of device according to this invention; in case several such elements are employed they are connected in series in a cascade arrangement. The effect of such Peltier elements, as is known, is such that when a dc voltage is applied to a Peltier element, heat is withdrawn from one side of the element and transported to the other side of the Peltier element. When the direction of current flow is changed, the direction of heat transport changes as well, so that the storage chamber can either be cooled or heated by means of one and the same Peltier element.
In this connection, it has been known to utilize such Peltier elements for the cooling of iceboxes intended for camping and automobile trips. It is furthermore known to provide tubular heat-conductive moldings on the plate of the Peltier elements located on the side of the storage chamber.
The invention is based on the object of obtaining a maximally homogeneous temperature abduction within the storage chamber; in this connection, almost no temperature gradient is to exist within the storage chamber in order to achieve identical temperature conditions with respect to the entire content of the storage chamber.
According to this invention, this object has been attained by providing that the tubular heat-conducting members 3 forming in direct mutual contact the inside of the storage chamber are prismatic, hollow molded articles exhibiting in particular a quadrangular cross section and made of a readily heat-conducting material, or by providing that a one-piece heat-conductive molding 17 of a readily thermally conductive material, or that a one-piece molding with an integrated heat-distributing zone 19 of a readily heat-conductive material constitutes the inside of the storage chamber 2. Thereby, on the one hand, an especially good heat abduction is obtained between the Peltier element 1 and the storage chamber, the inside of the storage chamber being located at such a distance from the Peltier element that it cannot lead to damage to the stored items on account of local subcooling or, in case of heating, to local hot spots.
Advantageously, the walls 7 of the storage chamber 2, likewise made of readily heat-conductive material, can be attached by means of screws, blind rivets or the like, or by means of heat-conductive adhesive to the outermost tubular heat-conducting members 3 or to the external lateral faces of the one-piece heat-conductive molding 17 or to the outer lateral faces of the one-piece molding with integrated heat-distributing zone 19. This design of the storage chamber effects fast heat abduction or, in case of heating operation, a quick supply of heat, a good heat transfer to the walls 7 of the storage chamber 2 being achieved via the outermost tubular heat-conducting members 3 or via the outer lateral surfaces of the one-piece heat-conductive molding 17 or via the outer lateral faces of the one-piece molding with integrated heat-distributing zone 19, whereby the entire walls of the storage chamber are available for heat transfer.
In this arrangement, the tubular heat-conducting members or the one-piece heat-conductive molding can be tightly mounted to the plate of the Peltier element 1 on the storage chamber side by means of clamp rails 5.
REFERENCES:
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patent: 3075360 (1963-01-01), Elfving et al.
patent: 3100970 (1963-08-01), Elfving
patent: 3196620 (1965-07-01), Elfving et al.
patent: 3220472 (1965-11-01), Raskin
patent: 3241604 (1966-03-01), Christensen
patent: 3290177 (1966-12-01), Mole et al.
patent: 3821881 (1974-07-01), Harkias
patent: 4448028 (1984-05-01), Chao et al.
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