| 摘要 |
Provided is an electronic expansion valve, wherein a valve cavity thereof is provided with a valve stem (24) therein, the valve stem (24) is axially movable along an axial through-hole of a valve seat of the electronic expansion valve to open or close a valve opening (251) provided in the valve seat. The valve stem (24) is provided with an axial through-hole in communication with the valve opening (251), and the axial through-hole side wall of the valve seat and the valve stem (24) are sealed. An end face of the valve stem (24) comprises a sealing face in sealing contact with an end face of the valve seat positioned at the valve opening (251), the sealing face comprises a first sealing face for withstanding an interface refrigerant action force and a second sealing face for withstanding a further interface refrigerant action force, and the effective pressure area of the first sealing face is equal to that of the second sealing face. The force acted on the valve stem (24) is only equal to the sum of the forces acted on the first sealing face and the second sealing face, since the two effective pressure areas are equal, regardless of the refrigerant coming from which interface, the valve stem (24) withstands an equal force, thus balancing the ability to open and close the valve. Further provided is an electronic expansion valve in line contact with the valve seat in a sealing manner, wherein the upper and lower effective pressure areas acted on the valve stem (24) by the refrigerant of an interface are equal, and the upper and lower effective pressure areas acted on the valve stem by the refrigerant of a further interface are equal. |
