JPS5926188Y2 - ventilation fan - Google Patents

Description

[Detailed explanation of the idea] This idea concerns the improvement of ventilation fans.

A conventional ventilation fan is shown in FIG. 1, and in the figure, 1 is an outer casing, which has an upper wall 1a formed into a substantially flat surface, a first opening 2 in a surface corresponding to this upper wall, and a side wall. 1b has a second
An opening 3 is provided.

Reference numeral 4 denotes a crosspiece to which the outer casing is fixed to the ceiling 5. Reference numeral 6 denotes a blower, which is composed of a blade casing 7 consisting of an upper casing 7a and a lower casing 7b, centrifugal blades, and an electric motor 9 for rotating the blades 8.

10 is a motor attachment provided on the lower casing 7b;
11 is a discharge port of the blade casing 7; 12 is a blower fitting provided inside the side wall 1b of the outer casing 1; 13 is a grill that covers the opening 2, and a ventilation port 14 is provided therein.

Reference numeral 15 denotes a duct connecting pipe formed in a tapered shape and provided outside the outer casing 1 of the second opening 3, and a shutter 16 that opens with the wind pressure of the blower 6 is rotatably provided at the tip. There is.

17 is a duct connected to this duct connecting pipe.

The conventional ventilation fan is constructed as described above, and the blades 8 are rotated by driving the electric motor 9, and indoor air is sucked in from the first opening 2 and discharged into the duct 17 through the blade casing 7.

The electric motor 9 is driven to ventilate the indoor air in this way, but driving the electric motor 9 generates vibrations, which are transmitted to the side wall 1b of the outer casing 1.

Since the upper wall 1a is in a free state (drum-shaped), the vibrations transmitted to the side wall become large at the upper wall 1a, which has the drawback of increasing noise from the ventilation fan.

Incidentally, since the blower 6 or the crosspiece 5 is fixed to the walls other than the upper wall 1a, there is little vibration.

This invention was developed in view of the above-mentioned drawbacks, and the purpose of this invention is to provide a ventilation fan that suppresses vibrations caused by earthen walls and has low noise.

Hereinafter, one embodiment of this invention will be described with reference to FIG. 2. In the figure, 1 to 7 indicate the same or equivalent parts as the above-mentioned conventional example, and 18 indicates the above-mentioned upper casing 7a made of plastic; A plurality of connecting members are integrally molded with the upper wall 1a and are provided in a protruding manner so as to press against the upper wall 1a.

In the ventilation fan configured in this way, the vibration caused by the drive of the electric motor 9 is caused to press the upper wall 1a with the connecting member 18, so that the upper wall 1a is in a free state (drum-shaped) as in the conventional case. This reduces vibrations and reduces the noise from the ventilation fan.

In the above embodiment, the connecting member 18 is connected to the blade casing 7.
A similar effect can be expected by providing it on the upper wall 1a of the outer casing 1.

As explained above, this invention is based on the provision of a connecting member between the blower and the earthen wall of the outer casing so that the blower and the earthen wall are connected, so that the vibrations caused by the drive of the electric motor are suppressed by the outer casing 1. This has the effect of reducing the noise from the ventilation fan.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example, and FIG. 2 is a sectional view showing an embodiment of this invention. In addition, the same reference numerals in each figure indicate the same or corresponding parts, and 1
1 is the outer casing, 1a is the top wall, 1b is the side wall, 2 is the first opening, 3
6 is a second opening, 6 is a blower, 7 is a blade casing, 8 is a blade, 9 is an electric motor, and 18 is a connecting member.

Claims (4)

[Scope of utility model registration request] (1) An outer casing having a nearly flat earthen wall, a first opening in the wall corresponding to the upper wall, and a second opening in the side wall, and an interior of the side wall of the outer casing. A ventilation fan comprising a blade casing attached to a blade casing, a blower comprising blades and an electric motor, and a connecting member provided between the blower and the earthen wall of the outer casing so that the blower and the upper wall are connected. (2) The ventilation fan according to claim 1, wherein the connecting member is provided on the blower. (3) The ventilation fan according to claim 2, which is a registered utility model, in which the blade casing is made of plastic, and the blade casing and the connecting member are integrally molded. (4) A ventilation fan according to claim 1, in which the connecting member is provided on the earthen wall of the outer casing.