Refrigeration – Refrigeration producer – Sorbent type
Reexamination Certificate
2000-02-03
2001-06-19
Doerrler, William (Department: 3744)
Refrigeration
Refrigeration producer
Sorbent type
C062S484000, C062S267000
Reexamination Certificate
active
06247331
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an absorption refrigerator and the method of the producing the same, and more particularly, to an absorption refrigerator having two absorbers and two evaporators arranged in a two-stage manner which can pump up heat from low temperature to high temperature with a large temperature difference.
An example of an absorption refrigerator is shown in the Japanese Paten Laid-open 59-18355/1984 that has two absorbers and two evaporators arranged in a two-stage manner and that is capable of pumping up heat with the large temperature difference. The absorption refrigerator shown in this prior art has a low temperature evaporator and a low temperature absorber besides an evaporator and an absorber that are provided in an conventional absorption refrigerator. Refrigerant liquid condensed in a condenser evaporates and vaporizes in the evaporator, then the refrigerant vapor is absorbed into a concentrated solution in the absorber. A part of the refrigerant liquid which did not evaporate in the evaporator evaporates in the low temperature evaporator, then it flows into the low temperature absorber. As a result, it is absorbed into a middle concentrated solution which is the diluted solution.
Another example of the absorption refrigerator is described in the Japanese Patent Laid-open 4-268171/1992 that has absorbers arranged in a two-stage manner and that is capable of pumping up heat with the large temperature difference. This absorption refrigerator provides a mid-absorption room and a mid-evaporation room between an evaporation room and an absorption room. In a heating mode, refrigerant liquid condensed in a condenser is introduced to the evaporation room, and the refrigerant liquid that could not evaporate in the evaporation room is introduced to the mid-evaporation room. That is, the refrigerant liquid flows into the evaporation room and the mid-evaporation room in series.
There is an advantage that the absorption heat pump shown in the Japanese Patent Laid-open 59-18355/1984 can pump up heat from the low temperature to the high temperature because of having a two-stage type evaporator-absorber. The solution in the low temperature absorber absorbs the refrigerant vapor and rises its temperature in the absorption refrigerator. This solution is conducted to the high temperature evaporator through a bypassed return conduit of the refrigerant liquid. This causes the temperature difference for heat transfer to be large and the performance of an absorption cycle to be low because the refrigerant temperature at a discharge of the absorber is higher than the evaporation temperature of the refrigerant. In addition, the pumping power for circulating the refrigerant from the evaporator to the absorber it is also needed.
By the way, the refrigerant liquid is supplied from the evaporator room of lower temperature side to the mid-evaporating room of higher temperature side sequentially in heating operation in the Japanese Patent Laid-open 4-268171/1992. Thus, the absorption cycle can be used even in the heating operation. However, this absorption refrigerator does not work as an absorption refrigerator having absorbers and evaporators arranged in a two-stage manner but works as a conventional absorption refrigerator having single stage absorber in the cooling operation. Thus, it can not pump up cold below 0° C. This absorption refrigerator transports heat from the mid-absorption room to the mid-evaporation room with heat pipes. The temperature difference for heat transport may become larger and the performance of the absorption cycle will be degenerated. It is needed that both of the temperature difference between the solution and the substances in the heat pipes and the temperature difference between the substances in the heat pipes and the refrigerant vapor are larger than the temperature difference that the heat exchange can occur. Therefore, it is desired that the absorption refrigerator is free from the above inconveniences.
BRIEF SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to realize an absorption refrigerator having absorbers and evaporators arranged in a two-stage manner with the high absorption cycle performance.
It is another object of the present invention to realize an absorption refrigerator having absorbers and evaporators arranged in a two-stage manner with the simple structure and low cost.
It is still another object of the present invention to realize an absorption refrigerator having absorbers arranged in a twostage manner that is suitable for pumping up the cold below 0° C. from the low temperature side evaporator.
A first characteristic feature of the present invention to achieve the above objects resides in an absorption refrigerator having a first evaporator, a first absorber, a regenerator, and a condenser comprising a second evaporator conducting a refrigerant liquid accumulated in the first evaporator; a second absorber absorbing the refrigerant vapor evaporated in the second evaporator; refrigerant liquid control means controlling flow rate of the refrigerant flowing from the first evaporator for keeping the concentration of the refrigerant liquid in the second evaporator to the predetermined value; and a heat transfer member interposed between the first evaporator and the second absorber; wherein the first evaporator, the second evaporator, the first absorber and the second absorber are made of a unitary chamber.
Preferably, the heat transfer member is a corrugated plate extending in the vertical direction; the absorption refrigerator further comprises a conduit introducing a solution from the first absorber to the second absorber, and heat exchange means exchanging heat between a diluted solution accumulated in the second absorber and the solution introduced in the second absorber; the refrigerant liquid control means further comprises level height detecting means detecting a level height of the refrigerant liquid in the second evaporator and a control valve disposed in a flow passage for the refrigerant liquid from the first evaporator to the second evaporator.
A second characteristic feature of the present invention to achieve the above objects resides in an absorption refrigerator having a regenerator, a condenser condensing a refrigerant vapor generated in said regenerator, a first evaporator evaporating a refrigerant liquid condensed in said condenser and a first absorber absorbing the refrigerant vapor evaporated in the first evaporator into a solution comprising a second evaporator introducing the refrigerant liquid accumulated in the first evaporator; a second absorber absorbing the refrigerant liquid evaporated in the second evaporator into the solution; and a heat transfer member interposed between the first evaporator and the second absorber; wherein the second evaporator, the second absorber, the first evaporator and the first condenser are located in this order and are made of a unitary chamber, and the refrigerant liquid condensed in the condenser is introduced to the second evaporator passing through the first evaporator.
Preferably, the absorption refrigerator further comprises communicating means for communicating the refrigerant liquid accumulated at a bottom of the first evaporator with the refrigerant liquid accumulated at a bottom of the second evaporator; the heat transfer member is corrugated in the horizontal direction.
Further, it is preferable that the heat transfer member is a plate having a concave portion and a convex portion on a surface of the plate and extending in the vertical direction.
Preferably, the absorption refrigerator further comprises refrigerant liquid sprinkling means sprinkling the refrigerant liquid over and in the vicinity of the heat transfer member facing to the first evaporator and solution sprinkling means sprinkling the solution over and in the vicinity of the heat transfer member facing to the second absorber, and the refrigerant liquid sprinkling means is located upper than the solution sprinkling means.
Further, it is preferable
Nakajima Tadakatsu
Nishiguchi Akira
Ohuchi Tomihisa
Sakiyama Ryoko
Crowell & Moring , L.L.P.
Doerrler William
Hitachi , Ltd.
Shulman Mark S.
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