JPS5971941A - Ventilating fan - Google Patents

Abstract

PURPOSE:To enable to prevent an inner surface of a room wall from dewing, by a method wherein a dew sensor is fixed to a position on an indoor side of a main body of a ventilating fan provided with a blower so that the blower is made to start based on a detecting signal of the dew sensor, through which ventilation of the inside of the room is started prior to generation of a dew on the inner surface of the room wall. CONSTITUTION:A voltage variation corresponding to detected humidity by a dew sensor 17 is applied to a comparison circuit 22 as a detected signal by a signal voltage generating circuit 21, and a motor 9 is electrified by making a relay 24 act when the detected signal becomes more than a reference voltage value to be applied to the comparison circuit 22 from a reference voltage generating circuit 20, that is, when a matter that the dew sensor 17 itself is dewed is detected by the sensor 17, through which a blower 8 is made to start. As the dew sensor 17 is apt to be influenced by an atmospheric temperature when a temperature of the outside D of a room is lower than that of the inside C of the room, the dew sensor 17 losts no time in generating a dew prior to dewing on an inner surface of a room wall A, by detecting which the blower 8 is started. When dew water is evaporated to dryness, operation is stopped.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a ventilation fan suitable for use in bathrooms and the like.

[Technical background of the invention]

(1) Conventionally, in bathroom ventilation fans, a dew condensation sensor detects the degree of dew condensation on the inner surface of the room wall, and based on the detection signal, the fan in the ventilation fan is activated to achieve ventilation, thereby controlling the humidity in the room. There is a device which is designed to reduce the water droplets on the inner surface of the chamber wall, thereby evaporating the water droplets on the inner surface of the chamber wall, thereby preventing mold from forming on the chamber wall.

[Background technology point]

By the way, as is well known, the phenomenon of condensation on the inner surface of a room wall is such that when the temperature is unexpectedly lower than the indoor temperature, the moisture contained in the indoor air is absorbed by the inner surface of the room wall, which has become low temperature due to the influence of the outdoor temperature. However, in the case of the conventional type mentioned above, the dew condensation sensor is attached to the inner surface of the room wall via a mounting device, etc. Therefore, the condensation sensor cannot be expected to reach a lower temperature before the inner surface of the room wall, and as a result, the condensation on the sensor is affected by the outdoor temperature. There is a time delay with respect to condensation, and the blower is only activated after dew has condensed on the inner surface of the room wall, which prevents the inner surface of the room wall from getting wet, and also prevents moisture from adhering to the inner surface of the room wall. In order to remove (evaporate) the water droplets, there was a problem in that long hours of ventilation operation were required. Furthermore, since the dew condensation sensor is attached to the room wall, when installing the ventilation fan, in addition to the installation of the ventilation fan itself, the dew condensation sensor must also be installed and its wiring work required, which is troublesome.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its object is to provide a ventilation fan that can prevent dew condensation from forming on the inner surface of a room wall and can also be installed easily.

[Summary of the invention]

In the present invention, a dew condensation sensor is attached to the indoor side of a ventilation fan body equipped with a blower, and the blower is activated based on a detection signal from the dew condensation sensor, thereby preventing dew from forming on the inner surface of the room wall. It is characterized by being able to start ventilation in the room, preventing dew condensation on the inner surface of the room wall, and simplifying the installation work.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

1 is the ventilation fan body inserted into the ventilation opening B of the room wall A,
2 is its outer box. The inside of this outer box 2 is partitioned by an inner plate 3 into a sealed equipment storage section 4 and a ventilation section 5 with an open front surface.
It is said that

Further, an exhaust lower is formed on the rear wall of the ventilation section 5, and a wind pressure release type shutter 7a is provided on the exhaust lower. Reference numeral 8 denotes a blower, which includes a motor 9 disposed in the equipment storage section 4, a blade 10 attached to a rotary shaft 9a that projects into the ventilation section 5 of the motor 90, and a blower 10 surrounding the motor 9 and the ventilation section 5. A casing 11 disposed inside the blower 8 has an inlet port 1 of the casing 11.
1a communicates with the intake port 6, and the discharge port 11b communicates with the exhaust lower. 12 is a decorative board, which is the front of the outer box 2 (
It is attached to the nuclear outer box 2 in such a way as to cover the surface facing the room (0), and this decorative panel 12 has horizontally long slit-shaped ventilation holes 1.
3 is formed in large numbers.

Furthermore, a partition wall 14 extending in the vertical direction is provided in a protruding manner on the inner surface of the decorative board 12 at a portion on the side of the equipment storage section 4. The partition wall 14 provides a ventilation section 5 serving as a ventilation path to the front surface of the outer box 2. Separated sensor housing portions 15 are formed. Reference numeral 16 denotes a mounting plate made of a good thermal conductor such as aluminum, which is attached to the outer box 2 of the ventilation fan main body 1 from the outer surface of the back, through the outer surface of the side, and to the sensor housing section 15 on the front of the outer box 2. A portion of the main body 1 on the indoor C side.

Among them, it is located in the sensor housing section 15 and attached to the mounting plate 16. Reference numeral 18 denotes a control device, which is provided in the equipment storage section 4, and as shown in FIG. Signal voltage generation circuit 21° comparison circuit 22. Relay control circuit 2
3. In short, the signal voltage generation circuit 21 outputs a pressure change according to the humidity detected by the dew condensation sensor 17 as a detection signal to the comparison circuit 22, and this detection signal is sent from the reference voltage generation circuit 20 to the comparison circuit. When the reference voltage value output to 22 is suddenly exceeded, that is, the dew condensation sensor 1
When the motor 7 detects dew condensation on itself, the relay 24 is operated to energize the motor 9, thereby starting the blower 8.

The operation of the above configuration will be explained. The temperature outside is now C indoors.
Considering the case where the temperature is lower than the temperature of the room wall A, the condensation sensor 17 provided on the ventilation fan main body 1 is detected before the inner surface of the room wall A, since the ventilation fan main body 1 itself faces the outside and is easily affected by the temperature of the outside air. The temperature becomes low. Furthermore, since the dew condensation sensor 17 is located on the indoor C side of the ventilation fan main body 10, it will be exposed to moisture in the humid atmosphere of the room C. Therefore, when the humidity in the room C increases, condensation quickly forms on the dew sensor 17 before condensation forms on the inner surface of the room wall A, and this is detected by the blower 8.
is activated, and its blowing action moves the air in the room C to the first
The air is discharged as shown by the arrow in the figure, and ventilation is thus performed just before the inner surface of the chamber wall A gets wet. Therefore, along with the ventilation,
The humidity in the room C is reduced, and based on this, the dew condensation sensor 17
The dew condensation water adhering to the air blower 8 is also evaporated, and when the dew condensation water has completely evaporated, this is detected and the operation of the blower 8 is stopped.

According to this embodiment, the dew condensation sensor 17 is not placed on the inner surface of the room wall A, but on the ventilation fan body 1 whose temperature drops faster than this.
Since it is located on the C side of the room, it is placed on the inner surface of the room wall A!
- It is possible to cause dew to condense on the dew condensation sensor 17 before dew is generated, and therefore, it is possible to ventilate the room C before the inner surface of the room wall A gets wet, thereby reliably preventing the inner surface of the room wall A from getting wet. Therefore, the growth of mold can be reliably prevented. Moreover, since ventilation is performed before condensation forms on the inner surface of the room wall A,
The ventilation operation time is sufficient to exchange the air in the room C, so that the evaporation of condensed water on the inner surface of the room wall,
The ventilation time can also be shortened, unlike the conventional method in which ventilation must be continued until vaporization is complete. Furthermore, since the condensation sensor 17 is provided on the ventilation fan body 1, the condensation (7) sensor 17 must be installed at the same time as the ventilation fan body 1 is installed.
There is no need to separately install 7, and this makes the installation work easier.

Further, according to this embodiment, a mounting plate 16 made of a good thermal conductor is provided on the ventilation fan body 1 across the outdoor D and indoor C, and the dew condensation sensor 17 is attached to this mounting plate 16, so that the dew condensation sensor 17 can be brought closer to the outside temperature. This makes it possible to cause dew condensation on the dew condensation sensor 17 itself more quickly, thereby making it possible to more reliably prevent dew condensation on the chamber gA.

Furthermore, the dew condensation sensor 17 is connected to the ventilation section 5 by the partition wall 14.
According to this embodiment, which is provided in a part separated from the (ventilation path),
It is possible to reliably eliminate the possibility that the blower 8 will be stopped before ventilation of the room C is insufficient. That is, if the dew condensation sensor 17 exists in the ventilation part 5, even if the humidity in the room C is still high, the dew condensation water from the dew condensation sensor 17 will flow into the ventilation part 5.
However, in this embodiment, the dew condensation sensor 17 is not affected by the wind, and is always connected to (8) Since the humidity condition is detected, the blower 8 is stopped when the room C is sufficiently ventilated and the humidity is sufficiently reduced.

〔Effect of the invention〕

As explained above, the present invention is characterized in that a dew condensation sensor is attached to the indoor side of a ventilation fan body equipped with a blower, and the blower is activated based on a detection signal from the dew condensation sensor. With this, it is possible to reliably prevent dew condensation from forming on the inner surface of the room wall, thereby reliably preventing the inner surface of the room wall from getting wet, and also reliably preventing the growth of mold. This provides excellent effects such as shortening ventilation time, reducing power consumption, and simplifying installation work.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional plan view;
FIG. 2 is a perspective view from the front with the decorative panel removed, FIG. 3 is a perspective view from the rear, and FIG. 4 is a block diagram. In the figure, 1 is the ventilation fan body, 4 is the equipment storage part, and 5 is the ventilation part (
8 is a blower, 14 is a partition wall, 16 is a mounting plate,
17 is a dew condensation sensor, and 18 is a control device. Applicant Tokyo Shibaura Electric Co., Ltd.

Claims (1)

[Scope of Claims] 1. A ventilation fan, characterized in that a dew condensation sensor is attached to an indoor side of a ventilation fan body equipped with a blower, and the blower is activated based on a detection signal from the dew condensation sensor. 2. The ventilation fan according to claim 1, wherein the dew condensation sensor is located in a part of the ventilation fan body that is separated from the ventilation path by a partition wall. 3. The ventilation fan according to claim 1, wherein the dew condensation sensor is attached to a mounting plate made of a good thermal conductor and provided on the ventilation fan body both outdoors and indoors.