Electronic expansion valve, and air conditioner

摘要

An electronic expansion valve includes a valve body, a valve seat, and a stepping motor. A valve portion is formed at a forward end of the valve body. The valve seat forms a variable throttle portion between the valve portion and the valve seat by allowing the valve body to move in an axial direction. The stepping motor moves the valve portion in accordance with a pulse number. At least one part of a side surface of the valve portion is shaped so that an opening degree ratio becomes constant.

主权项

1. An electronic expansion valve comprising:
a valve body whose forward end is provided with a valve portion; a valve seat that forms a variable throttle portion between the valve portion and the valve seat by allowing the valve body to move in an axial direction; and a stepping motor that moves the valve body in accordance with a pulse number, wherein when an area of a cross section of a gap formed between the valve portion and the valve seat and that is perpendicular to the axial direction is defined as an opening area and when an area ratio between the opening area in which the pulse number has not yet been increased and decreased and the opening area in which the pulse number has already been increased and decreased is defined as an opening degree ratio, at least one part of a side surface of the valve portion is shaped so that the opening degree ratio becomes constant.