Air heating unit of the air-conditioning

Abstract

The present invention relates to an air heating unit of the air-conditioning including a compressor, a thermal compensation device and an air cooled condenser connected sequentially with one another by pipeline to define a refrigeration cycle. A high-temperature gaseous refrigerant flowing in inner and outer tubes of the thermal compensation device performs transfers heat with an intermediate-temperature liquid refrigerant flowing in mid tube, so that temperature of a liquid refrigerant flowing in a capillary gap between mid and inner tubes is increased to achieve liquid expand and flow restrained effects. The capillary gap can block bubbles of super heat from entering and suppress the liquid refrigerant from flowing through. Thus, a limited amount of liquid refrigerant can be sucked into the compressor at a low pressure without having lubricating oil to be turned cold. This air heating unit eliminates the use of evaporators other than in a conventional refrigeration system.

What is claimed is: 
     
         1 . An air heating unit of the air-conditioning, comprising:
 a compressor, with a discharge end coupled to a first link tube line provided for a high-pressure high-temperature gaseous refrigerant and an oil to flow;   a thermal compensation device, having an inner tube, a mid tube and an outer tube of different diameters, said mid tube being sheathed with said outer tube therein, and said inner tube being sheathed with said mid tube therein to form a tri-tubing structure, and an output end of said first link tube line being coupled to said inner and outer tubes, for facilitating said high-pressure high-temperature gaseous refrigerant to flow and enter into said inner and outer tubes respectively, and an output end of said inner and outer tubes being coupled to a second link tube line for said high-pressure high-temperature gaseous refrigerant and said oil to flow;   an air cooled condenser, including an internal condenser coil installed in series therein and having an bottom inlet end coupled to an output end of said second link tube line, and a fan installed outside said air cooled condenser, such that said high-pressure high-temperature gaseous refrigerant charged into said condenser coil is cooled to change its state to form a high-pressure intermediate-temperature liquid refrigerant containing bubbles of super heat, and said condensed liquid refrigerant and oil flow out from the output end of said condenser coil and flow and enter into a third link tube line, and said third link tube line having a thermostat sensor attached thereon for measuring and detecting whether said liquid refrigerant passing through said third link tube line reaches a predetermined limitation of temperature to control said fan to be turned on or off, and said fan is operated intermittently to blow air to said condenser for heating purpose; and said mid tube, having an intake end and an output end coupled to said third link tube line and a fourth link tube line respectively, such that said intermediate-temperature liquid refrigerant flowing and passing said mid tube performs a heat transfer with said high-temperature gaseous refrigerant flowing in said inner tube and said outer tube, and said intermediate-temperature liquid refrigerant is expanded by heat gain, and said bubbles of super heat of said intermediate-temperature liquid refrigerant are blocked outside the inlet end of capillary gap between said mid tube and said inner tube; if said intermediate-temperature liquid refrigerant and oil containing no air bubbles flowing out from an outlet end of capillary gap between said mid tube and said inner tube flows and enters into said fourth link tube line, the pressure is depressed at once and the temperature is lowered to form a low-pressure intermediate-temperature unsaturated liquid refrigerant; and an output end of said fourth link tube line being coupled to a liquid-gas separator to disperse said low-pressure intermediate-temperature unsaturated liquid refrigerant and depress the pressure and lower the temperature again to form a low-pressure with suitable temperature liquid refrigerant, said low-pressure with suitable temperature liquid refrigerant and oil are sucked from a suction end of said compressor to define a refrigeration cycle.   
     
     
         2 . The air heating unit of the air-conditioning according to  claim 1 , wherein said inner tube, said mid tube and said outer tube are made of copper and have different diameters such as ⅜″, ½″ and ¾″ inches respectively. 
     
     
         3 . The air heating unit of the air-conditioning according to  claim 1 , wherein said first link tube line has a discharge end coupled to said inner and outer tubes through a shunt tube for facilitating said high-pressure high-temperature gaseous refrigerant and said oil to be delivered by said shunt tube to flow and enter into said inner tube and said outer tube respectively, and said second link tube line has an intake end coupled to said inner and outer tubes through a manifold tube for facilitating said high-pressure high-temperature gaseous refrigerant to be connected into said second link tube line. 
     
     
         4 . The air heating unit of the air-conditioning according to  claim 1 , wherein said condenser coil is connected in series, and said second link tube line is coupled to the intake end of said condenser coil at the bottom of said condenser, and said third link tube line is coupled to the output end of said condenser coil at the top of said condenser. 
     
     
         5 . The air heating unit of the air-conditioning according to  claim 1 , wherein said predetermined limitation of temperature is 75 Celsius degree. 
     
     
         6 . The air heating unit of the air-conditioning according to  claim 1 , wherein said fourth link tube line has a diameter greater than said outlet of capillary gap between said mid tube and said inner tube, and said liquid-gas separator has an internal diameter greater than the diameter of said fourth link tube line. 
     
     
         7 . The air heating unit of the air-conditioning according to  claim 1 , wherein said condenser coil is surrounded by a plurality of fins.