The electronic expansion monoblock valves is a new throttle device, which is controlled by a microprocessor, it appears to achieve a computer direct control and regulation of the refrigeration cycle. Electronic expansion valve and stepper motor type solenoid type two structural forms . Strictly speaking, the electromagnetic coil is a solenoid-type expansion valve. Now we are talking about the current electronic expansion valve usually refers to the stepper motor type. It consists of the valve body, valve, bellows, transmission and pulse stepper motor and other components. Pulse stepper motor drive mechanism, the bellows is a refrigerant passage with moving parts separated to prevent refrigerant leaks. Role of the drive mechanism is rotary motion of the motor into reciprocating motion of the spool. There are two kinds of transmission, gear transmission mechanism includes gear pairs, rib pairs, such as the transmission lever. Direct-acting actuator no gear pair.
Characteristics of electronic expansion valve to regulate large-scale, rapid and sensitive action, adjust precision, stable and reliable. The refrigerant in the electronic expansion valve can be positive, the reverse flow in both directions, avoiding the disadvantages of only one direction of the thermal expansion valve. Refrigeration system can be greatly simplified for the heat pump when. The cooling system is down, the electronic expansion valve can be completely closed, so that no need to install the refrigerant inlet solenoid valve.
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