Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1990-10-02
1992-08-11
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34133J, 34 73, F26B 2106
Patent
active
051367920
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a laundry dryer comprising a housing having outer panels, as well as an interior for holding laundry, being accessible via a door, and further comprising a condenser into which vapor-laden warm air from the interior, on the one hand, and a cooling medium, on the other, can be introduced, being brought into thermally conductive contact one with the other in the condenser for cooling the air.
A laundry dryer of the above-described type is known from German Patent No. 2,923,701.
Laundry dryers of the above-described type, which are also termed "convection dryers" or "condensation dryers," are characterized by the fact that they have a closed-circuit internal air circulation system. In this air circulation system, heated air is advanced through the wet laundry by means of a fan and is then advanced to a condenser. In this condenser, the warm, vapor-laden air flows through a first cavity, which communicates with a second cavity in a thermally conductive manner via a partition. A cooling medium, such as tap water or cold ambient air, for example, flows through a second cavity. As a consequence of the cooling of the vapor-laden air, at least a large portion of the water vapor condenses to water, which is then drained into a disposed collecting vessel. The cooled air that egresses from the condenser is now reheated and again advanced through the wet laundry. In the case of condensation dryers of this type, a lint screen is generally arranged upstream of the condenser in order to prevent entrained lint from the dried laundry from collecting on the thermally conductive surfaces of the condenser and thus deteriorating the thermal transmission.
In the condensation laundry dryer that is known from German Patent No. 2,923,701 that was cited at the outset, the door is designed purely as a closure element and does not serve any purpose whatsoever in conjunction with the drying process. The warm air flows through the tumbler drum of the laundry dryer in a direction which is perpendicular to the door. A cavity is disposed between door and drum, in which the warm air is deflected downwardly in order to first flow through a lint screen which is arranged in horizontal alignment at approximately the height of the bottom edge of the door. The air is then deflected away to the rear by the front panel of the laundry dryer, and flows horizontally through a heat exchanger, behind which a fan is disposed. The air is again deflected upwardly by the fan, passes through a heating register, and is then deflected a fourth time to now again flow through the tumbler drum from back to front.
It is known practice in condensation laundry dryers to integrate the lint screen in the door, so that the vapor laden warm air from the laundry drying area then flows through the lint screen in the door.
The condenser that is arranged beneath the tumbler drum in the known laundry dryer that was described at the outset has a thin, thermally conductive partition which is bent in an undulating configuration and which separates two cavities in the condenser one from the other. The heated, vapor-laden air from the interior of the laundry dryer flows through the one cavity, while cold outside air flows through the other cavity, for which purpose a further fan is disposed in the known laundry dryer. Both media flow in a direction that is parallel to the valleys that are formed by the undulating configuration of the partition, with the two media flowing in opposite directions.
In the known laundry dryer, the condenser can be arranged in an accessible manner so that it can be withdrawn from the chamber from time to time and can be very simply cleaned of the lint deposits. However German Patent No. 2,923,701 does not indicate the details of how this is to be accomplished.
In the known laundry dryer, the condenser occupies a relatively large space beneath the tumbler drum.
Consequently, the outside dimensions of the laundry dryer are very large relative to the wet laundry capacity of the laundry dryer. As a result, it is often diffi
REFERENCES:
patent: 2651113 (1953-09-01), Milby et al.
Bennet Henry A.
Gromada Denise L. F.
Zanket GmbH
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