JPH0131874Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ventilation fan, and more particularly to a ventilation fan having improved static pressure characteristics by forming a centrifugal diffuser air passage on the outlet side.

2. Description of the Related Art Conventionally, there is a ventilation fan in which a cylindrical ventilation fan body having a fan and a motor for driving the fan is inserted and attached to the tip of a ventilation duct such as an odor duct to perform ventilation for the purpose of deodorizing.

Such conventional ventilation fans have the drawback of poor static pressure characteristics and high specific noise level, which is the noise level per unit air volume and unit wind pressure.

Therefore, in view of the above-mentioned conventional situation, the present invention converts the velocity energy that was previously wasted into static pressure by forming a centrifugal diffuser air path on the outlet side of the cylindrical ventilation fan body. The present invention provides a ventilation fan that improves static pressure characteristics and reduces specific noise level, and in particular, the centrifugal diffuser air passage is formed with a simple structure.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In Figure 1, 1 is a ventilation duct such as a stink hole,
One end opening 1A is opened outdoors, and the other end opening is led indoors and opened. 2 is a cylindrical ventilation fan body, 2a is an outlet, 2b is an inlet, 6 is a fan disposed inside the ventilation fan body 2 on the side of the outlet 2a, 4 is a motor for driving the fan 6, and 5 is a mounting It is fixed to the inner wall of the main body 2 by its legs. The ventilation fan main body 2 is inserted into the duct 1 so that its axial direction matches the axial direction of the ventilation duct 1, and the open end of the air outlet 2a is inward from the outdoor opening 1A surface of the ventilation duct 1. The location is open to the outdoors. Reference numeral 3 denotes a ring-shaped first air path member attached to the open end of the air outlet 2a of the ventilation fan body 2, which includes a bell mouth portion 3a formed inside the air outlet 2a and extending in the air outlet direction; It has a structure in which a ring portion 3b extending from the peripheral edge substantially parallel to the opening surface of the air outlet 2a is integrally formed. The bell mouth portion 3a is connected to the inner circumferential surface of the air outlet 2a, extends from here to the end surface of the opening 1A of the ventilation duct 1, and is connected to the ring portion 3b in contact with the end surface. The fan 6 is set such that its tip protrudes outward from the enlargement start position of the bell mouth portion 3a. Reference numeral 8 denotes a disk-shaped second air passage member disposed substantially parallel to the first air passage member 3 at a position facing the air outlet 2a, and having the same outer diameter as the first air passage member. It is formed.

The second air passage member 8 is formed into a conical shape, so that when rain falls on the outer surface, the rain flows smoothly.

Therefore, in the first air passage member 3, a fixing piece 3c to the ventilation duct 1, which is the attachment part of the ventilation fan main body 2, and an attachment piece 3e of the second air passage member 8 are cut and formed integrally. has been done.

That is, the fixing piece 3c is attached to the first
Based on the U-shaped cut groove 3f provided in the ring portion 3b of the air passage member 3, it is vertically raised near the outer end surface of the opening 1A of the ventilation duct 1 on the back side as shown in FIG. be. And this fixed piece 3
The first air passage member 3 is fixed to the ventilation duct 1 by screwing the fixing screw 7 into the internal threaded portion 3d formed in the shape of the screw 7 and abutting the tip of the fixing screw 7 against the outer peripheral surface of the ventilation duct 1. As a result, the ventilation fan main body 2 is fixed to the ventilation duct 1. Further, as shown in FIG. 2, the mounting piece 3e is vertically raised on the front side based on a U-shaped cut groove 3g provided in the ring portion 3b, and then bent horizontally. Then, by attaching the second air passage member 8 to the horizontal portion 3h of the attachment piece 3e with the attachment screw 9, the second
The air passage member 8 is fixedly attached to the first air passage member 3.

The first and second air path members 3 and 8 configured as described above constitute a centrifugal diffuser air path 10 that communicates with the air outlet 2a.

According to this configuration, the centrifugal differential user air path 1
By forming 0, it is possible to improve the static pressure characteristics of the ventilation fan by converting velocity energy into static pressure.This reduces the specific noise level, which is the noise level per unit air volume and unit wind pressure, and reduces the noise level during actual use. can be lowered. In addition, by integrally forming the fixing piece 3c and the mounting piece 3e on the first air path member 3, it is possible to fix the fixing piece to the ventilation duct 1 and the first and second
The air passage members 3 and 8 can be easily fixed to each other without providing a separate fixing means, and the structure is simple. Furthermore, according to this configuration, the fixing piece 3c to the ventilation duct 1 is attached to the first air path member 3 coupled to the ventilation fan main body 2.
By integrally molding the first air path member 3, the first air path member 3 has the function of fixing the ventilation fan main body 2 to the ventilation duct 1, and the second air path member 8 has the air outlet 2a.
Since it is possible to perform the function of preventing rainwater from entering, there is no need to separately provide means for fixing the ventilation fan main body 2 or means for preventing rainwater from entering, and the configuration of the ventilation fan can be simplified.

As explained above, according to the present invention, by providing a centrifugal diffuser air path using the first and second air path members at the outlet of the ventilation fan main body, it is possible to improve static pressure characteristics and reduce noise. The first air duct member and the second air duct member are attached to each other by a mounting piece integrally molded on the first air duct member, and a fixing piece integrally molded on the first air duct member is used to attach the ventilation fan main body. Since it is fixed to the mounting site, the centrifugal diffuser air path can be constructed with a simple structure, and the structure of the ventilation fan itself can be simplified, which is a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of a ventilation fan according to the present invention, and FIG. 2 is a perspective view showing the structure of a first air passage member in the same embodiment. 1... Ventilation duct, 2... Ventilation fan body, 3...
First air path member, 3a...Bellmouth portion, 3c...
...Fixing piece, 3e...Mounting piece, 4...Motor, 6...
...Fan, 8...Second air path member, 10...Centrifugal diffuser air path.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Air outlet 2a of a cylindrical ventilation fan body 2 that includes a fan 6 and a drive motor 4 for the fan 6.
The opening end includes a bell mouth part 3a formed inside the air outlet 2a and extending in the air outlet direction, and a ring part 3b extending from the periphery of the bell mouth part 3a substantially parallel to the opening surface of the air outlet 2a. A ring-shaped first air path member 3 is coupled to the first air path member 3 at a position facing the air outlet 2a and substantially parallel to the first air path member 3 with a predetermined distance therebetween. A second air passage member 8 having substantially the same outer diameter is provided, and the first air passage member 3 is provided with a fixing piece 3c to the attachment portion of the ventilation fan main body 2 and an attachment piece for the second air passage member 8. A ventilation fan characterized by being cut and formed integrally with 3e. (2) The ventilation fan according to claim 1, characterized in that the fan 6 is positioned so as to partially protrude outward from the expansion start position of the bell mouth portion 3a.