| 摘要 |
PURPOSE: An air conditioning system is provided to improve stability by controlling an injection valve depending on pressure that refrigerants are injected. CONSTITUTION: An air conditioning system comprises a condenser, a first expansion device(141), a second expansion device(142), an evaporator, a scroll compressor(110), an injection valve(153), and a controller. The first expansion device throttles refrigerants passing through the condenser. The second expansion device throttles the refrigerants passing through the first expansion device. The evaporator evaporates the refrigerants passing through the second expansion device. The scroll compressor comprises first and second compression units. The first compression unit compresses the refrigerants passing through the evaporator. The second compression unit compresses the refrigerants passing through the first compression unit and the refrigerant injected between the first and second expansion devices. The injection valve throttles the refrigerants injected to the second compression unit. The controller compares the pressure of the refrigerants throttled in the first expansion device with the pressure of the refrigerants injected to the second compression units and changes the opening degree of the injection valve depending on the compared result. |
