| 主权项 |
1. An expansion valve for use in a refrigeration cycle, for throttling and expanding a refrigerant flowing from an upstream side and supplying the expanded refrigerant to an evaporator, the expansion valve comprising:
a body having a first passage through which the refrigerant flowing from the upstream side to the evaporator passes, a second passage through which the refrigerant returning from the evaporator passes, a valve hole formed in the first passage, and an insertion hole formed coaxially with the valve hole in a partition separating the first passage from the second passage; a valve element configured to move toward and away from the valve hole to close and open a valve section; a power element provided on the body and configured to sense a temperature and a pressure of the refrigerant flowing through the second passage and generate a drive force for opening or closing the valve section; a shaft extending through the insertion hole, having a first end connected to the power element and a second end connected to the valve element, and being configured to transmit the drive force of the power element to the valve element; a vibration-proof spring fixed to the body coaxially with the insertion hole, the vibration-proof spring supporting the shaft so that the shaft coaxially extends through the vibration-proof spring, the vibration-proof spring biasing the shaft radially inwardly to apply a sliding resistance to the shaft; and a seal ring having flexibility and being supported by one of an inner surface of a support part of the body defining the insertion hole and an outer surface of the shaft, the seal ring being in close contact with the other of the inner surface of the support part and the outer surface of the shaft, wherein the expansion valve includes an arrangement of the seal ring, sliding portions of the shaft and the support part along each other, and the vibration-proof spring in that order from a first passage side toward a second passage side in an axial direction of the shaft. |
