Combined expansion device and four-way reversing valve in...

Details Combined expansion device and four-way reversing valve in... Combined expansion device and four-way reversing valve in...

2005-05-17

2005-05-17

Jones, Melvin (Department: 3744)

Refrigeration

Reversible, i.e., heat pump

C062S119000, C062S222000, C062S513000

Reexamination Certificate

active

06892553

ABSTRACT:
A refrigerant system is operable in either heating mode or cooling mode. The system is also provided with an economizer cycle that will function in either heating mode or cooling mode. A four-way valve assembly selectively communicates refrigerant from either an indoor heat exchanger or outdoor heat exchanger to an economizer heat exchanger. The valve assembly further includes a restriction for restricting a refrigerant flow downstream of the economizer heat exchanger. The valve assembly provides two distinct restrictions such that a different size restriction is presented to the flow in cooling and heating modes. In this way, a single valve assembly can provide both the required routing for the alternative heating and cooling modes, and at the same time allow for distinct restriction sizes for the two modes without the necessity of separate expansion devices, also improving overall system cost and reliability.

REFERENCES:
patent: 4876859 (1989-10-01), Kitamoto
patent: 5095712 (1992-03-01), Narreau
patent: 5875637 (1999-03-01), Paetow
patent: 6047556 (2000-04-01), Lifson
patent: 6138467 (2000-10-01), Lifson et al.
patent: 6206652 (2001-03-01), Caillat
patent: 6385981 (2002-05-01), Vaisman
Systems & Advanced Technologies Engineering S.r.I., publication entitled “Compsys—Dynamic Simulation of Gas Compression Plants”, dated Jun. 12, 2002.
Copeland Europe publication entitled “Refrigeration Scroll for Parallel Applications” dated Feb. 26, 2002.

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