Distributor for a refrigeration system (10-Mar-2010)
A distributor for a refrigeration system distributing fluid to two or more evaporator paths and comprising a housing, an inlet and two or more outlets. The distributor comprises a rotation piston, the rotation piston comprising gates for fluid passage. The rotation piston can be placed to align a gate having a nozzle with an outlet allowing fluid passage to one or more outlets at a time. The rotation piston comprises toothed rims which engage with similarly toothed rims fixed in the housing to create a rotational force making the rotation piston rotate to shift fluid passage from one outlet to the next outlet.
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Distributor for a refrigeration system
The invention concerns a distributor for a refrigeration
system, distributing fluid to two or more evaporator paths
5 and comprising a housing, an inlet, two or more outlets.
Such a refrigeration system is known from DE 195 47 744 A1.
The known refrigeration system has one single compressor
and one single condenser; however, two separately formed
10 evaporators. After the condenser and before the expansion
valves, the refrigerant flow supplied by the compressor is
divided into two partial flows by means of a 3/2-way valve,
the position of the 3/2-way valve being controlled by a
control unit. With this embodiment, however, the
15 refrigerant flow can only be divided into two evaporation
paths.
In order to be able to provide several evaporation paths,
US 5,832,744 show a refrigeration system, in which the
20 distributor has a valve between a refrigerant inlet and
several refrigerant outlets, a rotating turbine disc being
connected after said valve. The purpose of the turbine
disc is to ensure that the refrigerant is distributed
evenly on all outlets of the distributor and thus evenly
25 on all evaporators.
Theoretically, such a distributor ensures an even
distribution of the refrigerant on the individual
evaporators. However, even small deviations in the
30 dimensions, which could, for example, occur in production,
cause that the refrigerant is distributed unevenly on the
individual evaporators. Additionally, in connection with
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such distributors, it is required that the individual
evaporators have basically the same thermal load and also
the same flow resistance. If this is not the case, it may
happen that an evaporator receives too much refrigerant,
5 so that the refrigerant has not evaporated completely
before having passed the evaporator. Another evaporator,
which is connected to the same distributor, can receive
too little refrigerant, so that the evaporator cannot
provide the desired refrigeration performance. The over-
10 supply or the under-supply of the evaporator may
particularly cause trouble, if temperature sensors located
at the evaporators or other parts of the refrigeration
system are controlling an expansion valve. Under
unfavourable conditions, the expansion valve can be
15 exposed to natural oscillation, which further reduces the
capacity and the efficiency of the refrigeration system.
In the following, the term "refrigeration system" is to be
interpreted broadly. It particularly refers to
20 refrigeration systems, freezer systems, air-conditioning
systems and heat pumps. The term "refrigeration system"
has merely been chosen for reasons of simplicity. The
evaporator paths can be located in different evaporators.
For reasons of simplicity, the invention is described in
25 connection with several evaporators. However, the
invention can also be used when one evaporator comprises
several evaporator paths, which can be controlled
individually or in groups.
30
The invention is based on the tas...
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