Control valve

摘要

A displacement control valve included in a variable displacement compressor. The compressor includes a fluid passage (48) for connecting a crank chamber (15) to a discharge chamber (39). The control valve includes a valve chamber (73) connected to the crank chamber (15) through the fluid passage (48), a valve hole (75) connected to the discharge chamber (39) through the fluid passage (48), and a valve body (74) located in the valve chamber (73). A bellows (87) influences the valve body (74) through a pressure sensitive rod (89) in accordance with suction pressure. A solenoid (72) includes a fixed iron core (92) and a plunger (93) arranged in a plunger chamber (91). The plunger (93) urges the valve body (74) through a solenoid rod (96) by a force determined by the level of electric current supplied to the solenoid (72). The fixed iron core (92), which is located between the valve chamber (73) and the plunger chamber (91), includes a guide hole (95) for receiving the solenoid rod (96). An annular passage for connecting the valve chamber (73) to the plunger chamber (91) is formed between the guide hole (95) and the solenoid rod (96). Accordingly, the pressure of the crank chamber (15) is applied to the plunger chamber (91) through the valve chamber (73) and the annular passage. In this control valve, the valve body (74) has desirable operating characteristics without relying on parts having precise dimensions. <IMAGE>