| 摘要 |
An automatic vacuum type refrigerant injection apparatus is provided to automatically vacuumize an air-conditioning refrigeration system to a set vacuum pressure for refrigerant injection, maintain a vacuum degree of the refrigeration system and inject a refrigerant according to a vacuum pressure sensed by a vacuum gauge. An automatic vacuum type refrigerant injection apparatus includes a portable case(10), a vacuum gauge, a first on-off valve(30), a manifolder(40), a second on-off valve(60), a three-way valve(70) and a controller(80). The vacuum gauge is arranged in the portable case and connected to a vacuum pump(100) through a first connecting pipe(22). The first on-off valve is attached to the first connecting pipe. The manifolder is connected to the vacuum gauge through a second connecting pipe(42), connected to a high voltage side of a refrigeration system(200) through a third connecting pipe(44) and connected to a low pressure side of the refrigeration system through a fourth connecting pipe(46). The second on-off valve is attached to the third connecting pipe and the third on-off valve is attached to the fourth connecting pipe. The controller controls the first, second and third on-off valves and the three-way valve.
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