Electronic expansion valve

An electronic expansion valve, comprising a valve seat, a vertical connecting pipe, and a transverse connecting pipe, the valve seat being provided with a main valve cavity;

• the electronic expansion valve further comprising a main valve port in communication with the vertical connecting pipe and a valve core seat configured to open and close the main valve port, the valve core seat being provided with a valve core valve port which allows a communication with the vertical connecting pipe;
• and the electronic expansion valve further comprising a valve needle component configured to open and close the valve core valve port;
• wherein,
• the electronic expansion valve further comprises a drive component, the drive component comprises a screw rod and a nut which cooperates with the screw rod by screw threads, and a lower end of the screw rod forms the valve needle component;
• a sleeve is fixed in the main valve cavity, and an upper portion of the sleeve cooperates with the nut;
• the valve core seat is axially movably arranged in the sleeve, and a lower portion of the screw rod extends into the sleeve to open and close the valve core valve port;
• and
• a circumferential side wall of the sleeve is provided with a first communicating hole close to the main valve port, the nut is provided with a second communicating hole configured to allow the main valve cavity to communicate with a sleeve upper cavity;
• and in a case that a fluid medium flows from the transverse connecting pipe to the vertical connecting pipe, the valve core seat closes the main valve port, a communication between the first communicating hole and the main valve port is disconnected, and meanwhile the sleeve upper cavity comes in communication with the main valve cavity via the second communicating hole;
• and in a case that the fluid medium flows from the vertical connecting pipe to the transverse connecting pipe, the valve core seat moves upward to open the main valve port, and the main valve port comes in communication with the main valve cavity via the first communicating hole.