JPS59195432U - ventilation fan - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Figure 1 is a sectional view showing how the ventilation fan of this invention is installed and in use, and Figures 2 to 4 are for explanation showing the process of setting the first bell mouth part to form the centrifugal diffuser air path in the ventilation fan of this invention. FIG. 5, a partially enlarged sectional view, is a graph showing the relationship between air blowing performance and specific noise at each time. In the figure, 2 is a ventilation hole, 4 is a first air passage member, 4b is a cylindrical duct part, 4
C is the first bell mouth part, 6 is the motor, 7 is the propeller fan, 8 is the second air passage member, 10 is the centrifugal diffuser air passage, D2 is the outer diameter of the propeller fan, and A is the rising starting point of the bell mouth part. , the mouth indicates the final point of expansion.

Claims (1)

[Claims for Utility Model Registration] A first air path member having a cylindrical duct inserted into a ventilation hole, and a propeller fan in the duct that covers the front of the ventilation hole at a predetermined interval when installed. A second air passage member having a driving motor installed in the center thereof forms a centrifugal diffuser air passage that communicates with the ventilation hole and houses the propeller fan, wherein the second air passage member is connected to the duct part in series. A first bell mouth portion provided near the second air path member. , the inner diameter between the expansion final points is approximately 1.15 times the outer diameter of the propeller fan, and the rising expansion angle from the rising start point from the duct part to the final point is S゛50 degrees, and a curved surface such as a parabola is formed between the rising start point and the expansion end point.