Refrigerant floating expansion apparatus

A refrigerant floating expansion apparatus, comprising:

• a main body having a base plate and a pipe-shaped housing, wherein the base plate is connected to the pipe-shaped housing and opposite to a first pipe opening of the pipe-shaped housing, the base plate has a first through hole and a plurality of second through holes, and a high-pressure fluid enters the main body via the first pipe opening;
• a standpipe fixed on the base plate, wherein the standpipe has a second pipe opening and a third pipe opening, the second pipe opening is connected to the first through hole, the second through holes of the base plate are outside the connection between the standpipe and the base plate, and the pipe wall of the standpipe has at least an opening near the second pipe opening;
• a float element surrounding the standpipe for controlling a fluid-passing area of the opening on the standpipe, wherein when the float element is positioned at the bottom of the standpipe, a gap is formed between the float element and the base plate to keep the second through holes passable;
• and
• a separation element surrounding the float element and disposed on the base plate for avoiding the high-pressure fluid flowing to the top surface of the float element, wherein, the separation element and the pipe-shaped housing form an inner path, and the separation element has a plurality of fluid passageways near the base plate;
• wherein, the high-pressure fluid is guided to pass through the fluid passageways along the inner path to move the float element for controlling the fluid-passing area of the opening, and the high-pressure fluid is transferred to a low-pressure fluid by exiting the main body from the second through holes directly and by entering the opening of the standpipe then exiting from the first through holes.