US 5,142,879 A · Air conditioning system

Abstract

An air conditioning system for multiple rooms, comprising: an outdoor unit including a variable delivery compressor, a four way reversing valve and an outdoor heat exchange unit; two main connecting pipes composed of a high pressure main pipe and a low pressure main pipe to connect between outdoors and indoors; a distribution controller which is connected to the main connecting pipes to divide them into a high pressure pipe, a low pressure pipe and a medium pressure pipe therein; a plurality of indoor units which include indoor heat exchangers, respectively, which are one end connected to the medium pressure pipe through electronic expansion valves, respectively, and which are the other end selectively connected to either one of the high pressure pipe and the low pressure pipe, respectively; detecting means for detecting either one of refrigerant temperatures and refrigerant pressures; and control means for carrying out a predetermimed control based on such detection.

Claims6

Dependent claims

An air conditioning system for multiple rooms, comprising:

an outdoor unit including a variable delivery compressor, a four way reversing valve and an outdoor heat exchange unit;
two main connecting pipes composed of a high pressure main pipe and a low pressure main pipe to connect between outdoors and indoors;
a distribution controller which is connected to the main connecting pipes to divide them into a high pressure pipe, a low pressure pipe and a medium pressure pipe therein;
a plurality of indoor units which include indoor heat exchangers, respectively, which are one end connected to the medium pressure pipe through electronic expansion valves, respectively, and which are the other end selectively connected to either one of the high pressure pipe and the low pressure pipe, respectively;
detecting means for detecting either one of refrigerant temperatures and refrigerant pressures;
and
control means for carrying out a predetermined control based on such detection.

4 more elements

An air conditioning system comprising:

a single outdoor unit including a compressor, a four way reversing valve, an outdoor heat exchange unit, a variable air volume type of outdoor fan for feeding air to the outdoor heat exchange unit, and an accumulator;
a first main connecting pipe and a second main connecting pipe;
a plurality of indoor units connected to the outdoor unit through the main connecting pipes, and including indoor heat exchangers and first flow controllers;
a first branch joint which is provided with valve systems to selectively connect one end of the indoor heat exchangers to either one of the first main connecting pipe and the second main connecting pipe;
a second branch joint which is connected to the other end of the indoor heat exchangers through the first flow controllers, and which is also connected to the second main connecting pipe through a second flow controller;
the first branch joint and the second branch joint being connected together through the second flow controller;
the second branch joint and the first main connecting pipe being connected together through a fourth flow controller;
a junction device which includes the first branch joint, the second branch joint, the second flow controller and the fourth flow controller, and which is interposed between the outdoor unit and the indoor units;
the outdoor heat exchange unit being constituted by a plurality of outdoor heat exchangers connected together in parallel and having both ends provided with electromagnetic on-off valves, and an outdoor bypass passage connected in parallel with the outdoor heat exchangers and having an electromagnetic on-off valve therein;
a fourth pressure detecting means arranged at a location between the outdoor heat exchangers and the four way reversing valve;
and
an outdoor unit heat exchange capacity adjusting means for controlling the air volume of the outdoor fan, the electromagnetic on-off valves at both ends of the outdoor heat exchangers and the electromagnetic on-off valve in the outdoor bypass passage so that the pressure detected by the fourth pressure detecting means achieves a desired pressure.

9 more elements

Dependencies are inferred from the claim text.

Air conditioning system

Life of this patent

Air conditioning system

Life of this patent

Abstract

Claims6