Reed valve device with air control valve.

摘要

A reed valve device with an air control valve operates in response to a signal pressure applied to a signal pressure port, so as to selectively allow a fluid introduced through a fluid inlet port to reach a reed valve through a gap between a diaphragm and the valve seat on the upper end of the inner cylinder, and to cause the fluid to forcibly open the reed valve so that the fluid is discharged through a fluid outlet port. When no signal pressure is applied, the diaphragm is seated on the valve seat to prevent the fluid from reaching the reed valve. The reed valve also is capable of blocking any reversing flow from the outlet port. The reed valve device has an upper casing including an outer cylinder provided with a fluid inlet port, and inner cylinder disposed in the outer cylinder, the gap between the lower ends of the outer and inner cylinders being closed, a lower casing provided with a fluid outlet port and communicating with the interior of the upper casing through the reed valve provided between these casings, the diaphragm placed on the upper ends of the outer and inner cylinders, a cover member having the signal pressure port formed therein and provided on the diaphragm, the diaphragm being clamped at its peripheral edge portion between the cover member and the outer cylinder, a coiled spring loaded between the cover member and the diaphragm so as to bias the diaphragm to keep it seated on a valve seat provided by the upper end of the outer cylinder, wherein the signal pressure applied to the signal pressure port produces a force to deflect the diaphragm against the force of the coiled spring away from the valve seat so as to allow a fluid introduced through the fluid inlet port to reach the reed valve through the space between the outer and the inner cylinders and through the interior of the inner cylinder, whereby the fluid introduced through the fluid inlet port into the space between the outer and inner cylinders is prevented from directly flowing into the inner cylinder. In consequence,the noise generated in the reed valve is prevented from directly propagating to the fluid inlet port, so that the level of the noise is reduced.