Electronic expansion valve

An electronic expansion valve, comprising:

• a valve seat provided with a valve cavity and a valve port, wherein the valve port is provided at an end portion of the valve cavity;
• a guide sleeve fixedly arranged on the valve seat, wherein the guide sleeve and the valve port are oppositely arranged, the guide sleeve is provided with a first guide hole, and the first guide hole is in communication with the valve cavity;
• and
• a valve needle movably arranged in the guide sleeve, wherein a first end of the valve needle penetrates out of the first guide hole to be arranged corresponding to the valve port, the valve needle is in clearance fit with the first guide hole, the valve needle is configured to control the valve port to be opened or closed, and a swingable amplitude of the valve needle in the first guide hole ranges from 0.4° to 2.4°;
• wherein the guide sleeve comprises a body section and a thin-walled section that are sequentially connected in an axial direction, the body section is provided with a first end and a second end that are oppositely arranged, the thin-walled section is connected with the first end of the body section, and an end surface of the first end and the thin-walled section are positioned in the valve cavity;
• an outer diameter of the thin-walled section is smaller than an outer diameter of the first end of the body section, and an outer diameter of a first end, close to the body section, of the thin-walled section is greater than an outer diameter of a second end, away from the body section, of the thin-walled section;
• and the valve needle partially penetrates the guide sleeve to be positioned in the valve cavity, and the thin-walled section is capable of guiding the valve needle.

An electronic expansion valve, comprising:

• a valve seat provided with a valve cavity and a valve port, wherein the valve port is provided at an end portion of the valve cavity;
• a guide sleeve fixedly arranged on the valve seat, wherein the guide sleeve and the valve port are oppositely arranged, the guide sleeve is provided with a first guide hole, and the first guide hole is in communication with the valve cavity;
• and
• a valve needle movably arranged in the guide sleeve, wherein a first end of the valve needle penetrates out of the first guide hole to be arranged corresponding to the valve port, the valve needle is in clearance fit with the first guide hole, the valve needle is configured to control the valve port to be opened or closed, and a swingable amplitude of the valve needle in the first guide hole ranges from 0.4° to 2.4°;
• wherein the valve seat is provided with a first connection port and a second connection port, and the first connection port is in communication with the valve cavity;
• the valve seat is further provided with a first transition hole section and a second transition hole section, wherein the first transition hole section, the valve port, and the second transition hole section are connected sequentially, the first transition hole section is in communication with the valve cavity, and the second transition hole section is in communication with the second connection port;
• and the second transition hole section is provided with a third end and a fourth end that are oppositely arranged, wherein the third end is connected with the valve port, a diameter of the third end is equal to a diameter of the valve port, and a diameter of the second transition hole section is gradually increased in a direction from the third end to the fourth end.