Electronic expansion valve

An electronic expansion valve, comprising:

• a valve body (10), a first chamber being formed in the valve body (10), a liquid inlet (11) and a liquid outlet (12) being oppositely provided at two ends of the valve body (10), and the liquid inlet (11) and the liquid outlet (12) being coaxially provided along a central axis of the valve body (10);
• a second chamber, provided in the first chamber, a coil (20) being provided in the second chamber;
• a third chamber, running through the second chamber, an inlet end of the third chamber being communicated with the liquid inlet (11), an outlet end of the third chamber being communicated with the liquid outlet (12), the inlet end of the third chamber and the outlet end of the third chamber being coaxially provided, and
• a valve core (31) capable of moving along the central axis being provided in the third chamber;
• and
• a first liquid passage hole (33), provided in a chamber wall of the third chamber, the first chamber being communicated with the liquid inlet (11) via the first liquid passage hole (33);
• a sliding rail slot (32) is provided in the chamber wall of the third chamber, and the valve core (31) slides along the sliding rail slot (32);
• an oil storage hole (321) is provided in an inner wall of the sliding rail slot (32).