| 摘要 |
<p>An expansion device having an integrally incorporated mechanism that can prevent an abnormal rise in a high pressure of a refrigeration cycle and can also deal with abnormal increases in the high pressure and a low pressure. A displacement means (bellows) (28) displaced by the high pressure is connected to a valve disc (24) of a throttle valve mechanism (32) to displace a rod (34) having a safety valve mechanism (33). When the high pressure is equal to or higher than a first predetermined pressure (a limit of the normal working pressure), a first portion (26) of the safety valve mechanism (33) disengages from a relief hole (27), which provides communication between a high pressure space (29) and a low pressure passage (31), to act as a second portion (25) that opens the relief hole (27), allowing the refrigerant in the high pressure space (29) to leak into the low pressure passage (31), thus preventing the high pressure from rising. The low pressure passage (31) is provided with a low pressure side fracture plate mechanism (40) that, when the low pressure reaches a second predetermined pressure, is fractured to provide communication of the low pressure passage (31) with an atmosphere. Further, the high pressure passage (30) is provided with a high pressure side fracture plate mechanism (50) that, when the high pressure is equal to or higher than a third predetermined pressure, is fractured to provide communication of the high pressure passage (30) with an atmosphere.</p> |
