| 摘要 |
PROBLEM TO BE SOLVED: To control a valve opening by a needle valve 4 in accordance with condensation pressure, in a throttle device 10 decompressing a refrigerant cooled by a condenser of a refrigeration cycle and delivering the same to an evaporator.SOLUTION: A valve seat member 2 having a valve port 21 and a cylindrical guide member 3 integrated with the valve seat member 2, are disposed in a cylindrical body case 1 constituting a primary chamber 11 connected to a condenser and a secondary chamber 12 connected to an evaporator. A coil spring 6 for biasing the needle valve 4 to a valve port 21 side, is disposed in the guide member 3. The needle valve 4 is guided along an axis L by the guide member 3 to make an opening of the valve port 21 variable. A clearance between the guide member 3 and the body case 1 is applied as a body-side flow channel 13 for delivering a refrigerant from the valve port 21 to the secondary chamber 12. A back space of the needle valve 4 in the guide member 3 is applied as an intermediate pressure chamber 44. The refrigerant is guided into the intermediate pressure chamber 44 from the valve port 21 through an intermediate pressure introduction passage 45. |
