JPH0519689Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a ventilation fan used for exhausting moisture and drying a room with high humidity, such as a bathroom.

[Conventional technology]

8 to 11 are a cross-sectional view, a perspective view, and a block diagram of a conventional ventilation fan of this type disclosed in Japanese Patent Application Laid-Open No. 59-71941. In the figures, 1 is a ventilation opening B of a partition wall A in a room. 2 is the main body casing, 3 is an inner plate that partitions the inside of the main body casing into a sealed equipment storage section 4 and an exhaust passage 5, 6 is a front air intake port, and 7a is a rear exhaust port. The shutter 8 is a blower, and is composed of a motor 9, an impeller 10, and a fan casing 11. 11a is an inlet of the fan casing, 12 is a decorative board, 13 is a ventilation hole provided in this decorative board, and 14 is for forming a sensor storage part 15 separated from the exhaust passage 5 on one side of the decorative board 12. The partition plate 16 is a mounting plate made of a good thermal conductor, which is attached to the main body casing 2 of the ventilation fan main body 1.
The mounting plate 16 is provided extending from the back side to the sensor storage section 15 on the front side, so that the mounting plate 16 is located both outdoors D and indoors C. Reference numeral 17 denotes a dew condensation sensor, which is mounted on the mounting plate 16 so as to be located in the sensor storage section 15. Reference numeral 18 denotes a control device, which is provided in the equipment storage section 4, and as shown in FIG.
0, a signal voltage generation circuit 21, a comparison circuit 22, a relay control circuit 23, and a relay 24. In short, the signal voltage generation circuit 21 uses a voltage change according to the detected humidity of the dew condensation sensor 17 as a detection signal and outputs it to the comparison circuit 22. When this detection signal exceeds the reference voltage value output from the reference voltage generation circuit 20 to the comparison circuit 22, that is, when the condensation sensor 17 detects condensation on itself, the relay 24 is activated. The motor 9 is energized to start the blower 8.

In the above configuration, when the humidity outside D is lower than the temperature inside the room C, the dew condensation sensor 17 provided in the ventilation fan body 1
The temperature becomes lower than that of the inner surface. Moreover, since the dew condensation sensor 17 is located on the indoor C side of the ventilation fan main body 1, it exists in the humid atmosphere of the indoor 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 partition wall A. This is detected and the blower 8 is started, and its air blowing action causes the air in the room C to rise. Air is discharged as shown by the arrow in FIG. 8, thus providing ventilation just before the inner surface of the partition wall A becomes wet. With this ventilation, the humidity in the room C is reduced, and based on this, the condensed water adhering to the condensation sensor 17 is also evaporated, and when this condensed water has completely evaporated, it is detected and the blower 8 operation will be stopped.

[Problem that the invention attempts to solve]

Since conventional ventilation fans are configured as described above, dew condensation occurs more easily on the condensation sensor than on the indoor C side of partition wall A, and the condensation continues for a longer period of time than the partition wall is condensed, which causes the ventilation fan to operate more than necessary. You will be driving for a long time. In addition, prolonged condensation not only causes corrosion of the electrodes of the condensation sensor and deteriorates its performance, but also causes problems such as the condensation sensor freezing and damaging it when the temperature outside is below freezing. In addition, since the equipment housing section 4 is partitioned off and sealed from the main body casing 2 by the inner plate 3, there is a drawback that the construction thereof is complicated.

This idea solves the above problems by storing the condensation sensor in a separate equipment storage box and easily placing it in a position where there is no risk of freezing, in order to dry the condensation sensor as soon as possible after the ventilation fan is operated. The purpose is to

[Means for solving problems]

In the case of this invention, the dew condensation sensor 17 is disposed so as to face the exhaust passage 5, and the dew condensation sensor 17 detects dew condensation, operates the blower, and calculates the amount of time based on the total time until the condensation dries and disappears. ,
After that, the operation time of the blower to be operated continuously is determined to dry the condensation on the partition wall A. Further, the dew condensation sensor is installed in the device storage box 40 with a sensor cover, and is disposed in the surplus space 15a formed between the fan casing 11 and the main body casing 2.

[Effect]

In the case of this invention, since the dew condensation sensor 17 provided in the equipment storage box 40 is arranged facing the exhaust passage 5, when the blower starts operating, it dries much faster than the partition wall A. However, the blower is operated until the operating time set by the control device 18 with a timer circuit based on the total operating time of the dew condensation sensor 17 to dry the partition wall A.
Furthermore, since the above-mentioned dew condensation sensor is covered with a sensor cover with a shielding grid, the exhaust flow does not directly impinge on it.

〔Example〕

An embodiment of this invention is shown below in Figures 1 to 7.
This will be explained using figures.

That is, in the figure, 1 is a ventilation fan body inserted into a ventilation opening B of a partition wall A in a room such as a ceiling;
Reference numeral 2 denotes the main body casing, the entire interior of which is an exhaust passage 5, and an exhaust port 7 is formed in the side wall of the main casing, which communicates with an exhaust pipe 25 via a shutter 7a in this part. has been done. Reference numeral 8 denotes an air blower, which is composed of a motor 9, an impeller 10, and a fan casing 11. An inlet 11a of the fan casing 11 communicates with the exhaust passage 5, and an outlet 11b communicates with the exhaust port 7. are doing. Reference numeral 12 denotes a decorative plate covering the ventilation opening B, 26 a locking spring provided on the decorative plate 12, 27 a hook provided on the main body casing 2 to hook the locking spring, and 29 a hook portion provided on the main body casing 2 to hook the locking spring. This sensor cover is attached to cover an opening 40a provided in the equipment storage box 40 so that the dew condensation sensor 17 can be seen.

15a in FIG. 2 is the fan casing 1.
1 and the main body casing 2 and communicates with the exhaust passage 5, and the airtight equipment storage box 40 provided with the control device 18 is disposed in this space. are doing. Furthermore, as shown in FIG. 3, 40b is provided so as to surround the fixing part 40 of the dew condensation sensor in the equipment storage box 40,
Ring-shaped jetty, 40c that prevents the intrusion of falling condensed water
29 is the above-mentioned sensor cover which has a hook-shaped projection provided on the outside of this jetty, a corresponding hook portion 29a and a passage hole 29b for the exhaust flow from the room, and as shown in FIG. sensor 1
A shielding grid 29d is formed on the opposite wall 29c located in front of the sensor 7 to prevent the exhaust flow from directly colliding with the dew condensation sensor, thereby guiding the exhaust flow as shown by the solid arrow in the figure. It's getting old.

Furthermore, FIG. 5 shows the above-mentioned control device of this invention, which includes a DC power supply circuit 19, a reference voltage generation circuit 20, a signal voltage generation circuit 21, a comparison circuit 22,
It is composed of a timer circuit 32, a control circuit 23, and a non-contact relay circuit 24, and is particularly characterized by having the timer circuit 32 composed of a microcomputer.

Next, the operation of this device will be explained.

That is, in FIG. 1, if the room C is sufficiently dry, the partition wall A and the condensation sensor 1 are
7 are at the same temperature. When water vapor starts to be generated in the room C in this state, depending on the temperature and humidity conditions, dew condensation appears on the portion facing the room C, including the partition wall A and the dew condensation sensor 17. The dew condensation sensor 17 has a characteristic that its resistance value changes drastically when the relative humidity becomes 90% or more, as shown in the characteristic diagram of Fig. 6. Therefore, when dew condenses on its surface, a signal voltage is generated. This brings about a large change in the output voltage from the circuit 21, which is compared with the reference voltage from the reference voltage generation circuit 20 by the comparison circuit 22, and is outputted to the timer circuit 32 as a dew condensation signal.

Based on the dew condensation signal, this timer circuit 32 outputs an operation signal to energize the motor 9 and start the blower 8 after a certain period of time has elapsed to prevent malfunctions due to temporary noise signals. The air from the blower 8 causes the condensation area facing the room C to start drying, but in particular the dew condensation sensor 17 located in the exhaust passage 5 inside the ventilation fan body 1 dries faster than other areas, and its resistance The values also return to their initial values one after another. When the resistance value falls below the set value, the dew condensation signal is no longer output, but the timer circuit 32 measures the total time during which the dew condensation signal continues to be output at the above stage, until the time when this total time is multiplied by a specific multiplier. The operation signal continues to be output and the blower continues to blow air.

Note that the above multiplier is a value obtained experimentally, and in a typical bathroom, even if conditions such as ventilation air volume, temperature, humidity conditions, and amount of water vapor generated change, the required values for the condensation sensor and the partition wall will be the same. 7th for drying time
As shown in the figure, there is an almost proportional relationship, each point in the figure represents an experimental value, and the straight line 33 shown in the figure covers them. In Figure 7, the area surrounded by the dashed line 34 is the experimental value when the humidity of the ventilation air is low, 35 is the experimental value when the humidity of the ventilation air is high, and 36 is the experimental value when the humidity of the ventilation air is high. The above multiplier obtained from the experimental results was 25, which was an experimental value when the amount was large. In addition, the operating time of the blower 8 is limited to the amount of water that the partition wall A can hold, and the efficiency is poor if the operating time is extremely long or extremely short. Time is 3 hours, shortest driving time is 0.5
It's time.

With the above configuration, the operation time of the blower is determined based on the total time of dew condensation detection by the dew condensation sensor 17, and if the blower is operated for that time, dew condensation on the partition wall will be eliminated and the partition wall will be dry. Note that during this operation, the dew condensation sensor is covered with the sensor cover 29, so that its surface is not directly contaminated by the exhaust flow.

In the above embodiment, a ventilation fan used in a bathroom has been described, but it goes without saying that by changing the multiplier described above, it can also be used as a ventilation fan for removing condensation.

[Effect of idea]

In this invention, as described above, the dew condensation sensor is fixed to the equipment storage box containing the control device, and is placed facing the exhaust passage, so the dew condensation sensor detects dew condensation and the blower is operated. Since it dries quickly in case of condensation, it not only prevents corrosion due to condensation, but also because the equipment storage box mentioned above is placed in the space between the fan casing and the main body casing.
There is no need to create a special sealed space, which improves installation workability.Furthermore, since the dew condensation sensor is covered with a sensor cover, it has the effect of preventing contamination from the exhaust flow and deterioration of performance due to freezing. be.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of this invention, Fig. 2 is an exploded perspective view of its main parts, Fig. 3 is an exploded perspective view of the equipment storage box, and Fig. 4 is an enlarged sectional view of the sensor cover. , FIG. 5 is a block diagram of the control device,
Figure 6 is a resistance-humidity diagram of the dew condensation sensor, Figure 7 is a correlation diagram between the dew condensation sensor and the drying time of the partition, and Figure 8
9, 10, and 11 are a sectional view, a perspective view, and a block diagram of a conventional example. In the figure, 5 is an exhaust passage, 8 is a blower, 17 is a dew condensation sensor, 18 is a control device, 29 is a sensor cover, 29b is a passage hole, 29c is an opposing wall, 32
indicates a timer circuit, and 40 indicates an equipment storage box. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A condensation sensor that detects dew condensation and a control device with a timer circuit that determines the operating time of the blower to continue operating based on the output time of the dew condensation signal output by the dew condensation sensor. The dew condensation sensor is provided in an equipment storage box facing the exhaust passage and containing the control device, and the dew condensation sensor is covered with a removable sensor cover having an exhaust flow passage hole. A ventilation fan characterized by: (2) A utility model as set forth in claim 1, wherein a shielding grid is formed on the opposite wall of the sensor cover that covers the internal condensation sensor of the equipment storage box to prevent the exhaust flow from directly colliding with the condensation sensor. Ventilation fan.