Cooling unit
A cooling unit wherein devices are divided so as to be installed in each of an outdoor unit and indoor unit, for downsizing the indoor unit and reducing its pipe-line cost. The cooling unit disposes a compressor, a condenser and a liquid receiver R in the outdoor unit, and disposes an expansion means and an evaporator in the indoor unit. The outdoor unit comprises a first bypass pipe closed by a first bypass valve so as to open/close freely. The indoor unit comprises a second bypass pipe, which is closed by a second bypass valve so as to open/close freely. The units are connected by a liquid pipe used as a supply line for refrigerant or hot gas by selecting a refrigerant supply line among the bypass valves and the open/close valves, and by a gas pipe communicating the evaporator to the compressor.
1. A cooling unit wherein
a compressor and a condenser are located in an outdoor unit;
an expansion means and an evaporator are located in an indoor unit;
liquefied refrigerant from said condenser is supplied to the evaporator through a first pipeline system and the expansion means;
the evaporator is configured so that vaporized refrigerant which has been cooled returns to the compressor through a second pipeline system; and
a liquid receiver connected to said first pipeline system on a downstream side of said condenser is installed in said outdoor unit,
said cooling unit comprising:
a first bypass pipe disposed in said outdoor unit, said first bypass pipe diverging, on a downstream side of said compressor, from a refrigerant pipe-line, which connects said compressor and said condenser, and connecting to said first pipeline system of said outdoor unit on a downstream side of said liquid receiver;
a second bypass pipe disposed in said indoor unit, said second bypass pipe diverging, on an upstream side of the expansion means, from said first pipeline system located in said indoor unit and connecting, on a downstream side of the expansion means, to an upstream side of the evaporator; and
a switch means disposed in each of said first and second bypass pipes and said first pipeline system, for switching a refrigerant supply line to either one of a state in which liquefied refrigerant from said liquid receiver is supplied to the expansion means through the first pipeline system, and a state in which vaporized refrigerant from said compressor is supplied to the evaporator through the first pipeline system.
2. The cooling unit according to claim 1 , wherein said switch means is composed of
a first bypass valve inserted in said first bypass pipe for opening/closing said first bypass pipe freely,
a second bypass valve inserted in said second bypass pipe for opening/closing said second bypass pipe freely,
a first open/close valve inserted on an upstream side of a connection to the first bypass pipe in said first pipeline system, said first open/close valve being on a downstream side of said liquid receiver; and
a second open/close valve inserted on a downstream side of a junction of said second bypass pipe in said first pipeline system, said second open/close valve being on an upstream side of the expansion means.
3. The cooling unit according to claim 1 , wherein said switch means comprises a first three-way valve inserted into a connection to the first pipeline system in said first bypass pipe; and a second three-way valve inserted into a diverging portion from the first pipeline system in said second bypass pipe.