JPS5930327Y2 - ventilation fan - Google Patents

Description

[Detailed explanation of the invention] This invention relates to the improvement of ventilation fans. A rectifying plate is attached to the intake port so that the characteristics of the fan can be changed arbitrarily to suit the conditions of the room being ventilated. The purpose of the present invention is to provide a ventilation fan whose characteristics can be selected and which can be used without reducing ventilation efficiency.

Hereinafter, one embodiment of this invention will be described with reference to FIGS. 1 and 2. In the figures, 1 is a case formed in a cylindrical shape, and an intake port 2 is provided at one end, and an exhaust port 3 is provided at the other end. is formed.

A plurality of springs 4 are provided around the outer periphery of the case, and the springs 4 press against the inner wall of the pipe 7 fitted into the opening 6 of the partition wall 5 to fix the case 1.

Reference numeral 8 denotes an electric motor provided in the case 1, 9 a diagonal flow blade fixed to the rotating shaft of the electric motor, 10 a mounting member provided on the back of the electric motor 8, and 11 a screw attached to this mounting member. A shutter frame 12 is attached to the shutter frame 12. The shutter 13 is formed to have the same diameter as the case 1 and is rotatable to open and close the exhaust gas 03 according to wind pressure.

Reference numeral 14 denotes a decorative grill attached to the above-mentioned intake port 2 part with a knob screw 15, and 16 indicates an engagement piece 17 attached to the above-mentioned intake port 2 part.
This is a rectifying plate that is detachably provided and is formed into a substantially conical shape with an intake opening 18, and this conical portion is formed so that the distance from the tip 9a of the blade 9 is a constant A. .

19 is a power cord.

This device is constructed as described above, and by driving the electric motor 8, the blades 9 are rotated, and indoor air is sucked in from the intake port 2 through the intake opening 18, and the shutter 13 is pushed up by wind pressure from the exhaust port 3, and the air is sent outdoors. Exhaust.

At this time, the current plate 16 is provided, and since the distance between the tip 9a of the blade 9 and the conical part of the current plate 16 is constant A, it becomes a centrifugal blade, and its air volume-static pressure characteristics are shown in Fig. 3. It is shown by three curves.

Next, by removing the current plate 16 from the intake port, the fourth
The state shown in the figure is reached, and the blades 9 are operated as a mixed flow type,
The air volume-static pressure characteristics at this time are shown by the 6 curves in FIG.

In this way, the air volume-static pressure characteristics can be changed depending on the presence or absence of the rectifier plate 16. For example, when used in a highly airtight room, the rectifier plate 16 is attached to increase the static pressure. When used in a room with a low airtightness, the ventilation efficiency is not reduced by removing the rectifying plate 16 to increase the air volume.

By changing the characteristics in this way, a single device can be used for both highly airtight rooms and poorly airtight rooms, eliminating the need to manufacture separate models with the respective characteristics.

Further, even if the conditions of the room change after the ventilation fan is attached to the pipe 7, the conditions can be dealt with by removing the ventilation fan and attaching or removing the rectifying plate 16.

As explained above, this idea consists of a case equipped with an intake port and an exhaust port, a blower installed in the case that uses blades and an electric motor, and the air intake port that can be attached to change the characteristics of the blower. By having a formed rectifier plate, there is no need to produce ventilation fans with two types of characteristics, and the characteristics can be selected according to the conditions of the room in which the ventilation fan is installed, and it can be used without reducing ventilation efficiency. There is an effect that can be done.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of this invention, Fig. 2 is a front view of Fig. 1, and Fig. 3 is static pressure vs. air volume with and without the rectifying plate 16 installed. The characteristic diagram, FIG. 4, is a sectional view showing a state in which the current plate 16 is removed from FIG. 1. In addition, the same reference numerals in each figure indicate the same or corresponding parts, and 1
is a case, 2 is an intake port, 3 is an exhaust port, 4 is a spring, 8 is an electric motor, 9 is a blade, and 16 is a rectifier plate.

Claims (3)

[Scope of utility model registration request] (1) A case provided with an intake port and an exhaust port, a blower consisting of blades and an electric motor provided in the case, and a rectifying plate formed to be attachable to the intake port to change the characteristics of the blower. A ventilation fan equipped with (2) The blades are formed in a diagonal flow shape, and the rectifying plate is formed in a conical shape with an intake opening, so that when the rectifying plate is attached, the diagonal flow blade is used in almost the same condition as a centrifugal blade. A ventilation fan according to claim 1 of the utility model registration claim, characterized in that: (3) Utility model registration claim 1 or 2, characterized in that the case is formed into a cylindrical shape, and a spring is provided on the outer periphery of the case, so that it can be attached to an opening provided in a partition wall. Ventilation fan as described.