Patent ID: 9739247
Date: 2017-08-22
CPC Classifications: F02M

Claim:
1. A mist forming method, comprising: setting locations of injection holes, a ratio of a length of the injection holes to a diameter of the injection holes, and an angle of the injection holes, in a nozzle portion of an injection hole plate based on a break length position which is a position at which liquid film flowing through the injection holes breaks up and is a break length from the injection holes; providing a cover plate on the injection hole plate, the cover plate comprising a pedestal portion contacting the injection hole plate and having a first diameter, and a thin portion provided on the pedestal portion in a stacking direction and having a second diameter greater than the first diameter, the thin portion overlapping the injection holes in the stacking direction and forming a radial channel between the thin portion and the injection hole plate; injecting fuel through the radial channel and out of a fluid injection valve formed on a valve seat having a valve seat surface at a midpoint in a fluid channel, an opening and a closing of the fluid channel being controlled by a valve body which contacts and moves apart from the valve seat surface, and one of the nozzle portion or the injection hole plate being located downstream of the valve seat and having the injection holes, wherein the setting of the locations of the injection holes is performed such that, when the injecting of the fuel is performed, directions of jets of the fuel output from respective injection holes are not brought into coincidence with a direction of a center axis of the injection holes and the jets remain separated from one another in a downstream part past the break length position, and after the jets from the respective injection holes turn into mists at a position downstream of the break length position, the mists gather by a Coanda effect exerted among the mists so that the mists become one solid mist, after which the one solid mist continues to gather as the one solid mist catches ambient air and thereby induces an air flow along a downstream flow direction in a predetermined in-mist portion, and wherein a sectional shape of the jets output from the respective injection holes of the fluid injection valve is a crescent shape and an aspect ratio of the jets is set to 1.5 or greater.