JPH0519690Y2 - - 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]

7 to 10 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 temperature outside D is lower than the temperature inside C, the condensation sensor 17 installed in the ventilation fan body 1 detects the temperature at the partition wall A because the ventilation fan body 1 itself faces the outside D and is easily affected by the temperature of the outside air.
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 activated, and its blowing action increases the humidity in the room C. Air is discharged as indicated by the arrow in FIG. 7, 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 is completely evaporated,
When this is detected, the operation of the blower 8 is stopped.

[Problem that the invention attempts to solve]

Conventional ventilation fans are configured as described above, and the ventilation fan is operated according to the output signal of the condensation sensor. Therefore, if the operation of the ventilation fan during dehumidification operation is entirely dependent on the output of the condensation sensor, for example, if a person taking a bath indoors feels cold, I can't seem to stop the ventilation fan. At that time, you can stop the dehumidification operation and completely stop the ventilation fan, but if you do this, you often forget to turn on the ventilation fan again for dehumidification, and there is a problem that there is a big risk that the dehumidification operation will not be performed in the future. Ta.

This idea was devised to solve the above problem, and is a ventilation fan that can temporarily stop the blower as needed without stopping the dehumidification operation according to the output signal of the dew condensation sensor. The purpose is to obtain.

[Means for solving problems]

The ventilation fan according to this invention is equipped with a control device that controls the operation and stopping of the blower based on the condensation signal output by the condensation sensor, and an automatic return type operation stop switch that temporarily stops the blower. be.

[Effect]

In this invention, the blower is controlled by the control device to perform dehumidification operation based on the dew condensation signal output by the dew condensation sensor, but even during dehumidification operation, an automatic return-type operation stop switch can be activated as needed. Operation of the ventilation fan can be temporarily stopped by operation.

〔Example〕

An embodiment of this invention is shown below in Figures 1 to 6.
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. has been done. Reference numeral 8 denotes a blower, which is composed of a motor 9, an impeller 10, and a fan casing 11, and the suction port 11a of the fan casing 11 communicates with the exhaust passage 5, and the discharge port 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 is a sensor cover attached to cover a fixing part 40a provided to fix a dew condensation sensor 17 provided in an equipment storage box 40.

Further, 15a in FIG. 2 is a space formed at a corner between the fan casing 11 and the main body casing 2 and communicating with the exhaust passage 5, and the control device 18 is installed in this space. The equipment storage box 40 is of a closed type. 40 more
As shown in FIG. 3, b is an annular jetty that is provided to surround the fixed part 40a of the equipment storage box 40 and prevents the intrusion of falling condensed water, and 40c is a hook-shaped projection provided on the outside of this jetty. 29 is the above-mentioned sensor cover which has a corresponding hook portion 29a and a ventilation hole 29b on the front side; 30 is the dew condensation sensor 17;
31 is the lead wire, 37 in Fig. 1 is the lead wire.
is an automatic return type operation stop switch for the blower 8, which is fixed to the main body casing 2 and connected between the power source 39, the control device 18, and the motor 9 as shown in FIG. If you feel cold while taking a bath, you can use this pull string to stop the blower in operation for a certain period of time.

Furthermore, FIG. 4 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, and a comparison circuit 2.
2. It is composed of a timer circuit 32, a control circuit 23, and a non-contact relay circuit 24. In particular, by having the timer circuit 32, the ventilation fan can be operated by an automatic return type operation stop switch 37 as needed without interrupting the dehumidifying and frosting operation. can be temporarily suspended.

Next, the operation of this device will be explained.

That is, in FIG. 1, when the room C is sufficiently dry, the partition wall A and the dew condensation sensor 17 are at the same temperature. In this state, indoor C
When water vapor starts to be generated, depending on the temperature and humidity conditions, dew condensation appears on the partition wall A and the portion facing the room C, including the dew condensation sensor 17.
The dew condensation sensor 17 has a characteristic that its resistance value changes greatly when the relative humidity becomes 90% or more, as shown in the characteristic diagram of FIG. This brings about a large change in the output voltage from the generation 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. In principle, the operation signal continues to be output and the blower continues to blow air, but if necessary, the automatic return type operation stop switch 37 can be activated.
You can temporarily stop the ventilation fan for a certain period of time by operating the button, and then automatically restart the operation of the ventilation fan for dehumidification.

Note that the above multiplier is a value determined 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 condensation sensor and the partition wall will not work properly. There is a nearly proportional relationship between the required drying times as shown in FIG. 6, and each point in the figure represents an experimental value, and the straight line 33 shown in the figure covers them. In Figure 6, 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 efficiency is poor if the operating time is extremely long or extremely short. is 3 hours, and the shortest driving time is 0.5 hours.

With the above configuration, if the operating time of the blower is determined based on the total time of dew condensation detection by the dew condensation sensor 17 and the blower is operated for that time, dew condensation on the partition wall will be eliminated and the partition wall will be dried. If you wish to temporarily stop the air blowing during this operation, you can pull the above-mentioned pull cord 38.

Although the above embodiment describes a ventilation fan used in a bathroom, by changing the multiplier described above, it can also be used as a ventilation fan for removing condensation, and the operation stop switch may be operated by other means. Of course.

[Effect of idea]

As described above, this device has a configuration that includes a control device that controls the operation and stopping of the blower based on the dew condensation signal output by the dew condensation sensor, and an automatic return type operation stop switch that temporarily stops the blower. Therefore, even during the dehumidifying operation, the operation of the ventilation fan can be temporarily stopped as needed without stopping the dehumidifying operation, which is very easy to use, and has the effect of effectively dehumidifying.

[Brief explanation of the drawing]

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, Fig. 4 is a block diagram of the control device, Fig. 5 is a resistance-humidity diagram of the dew condensation sensor, Fig. 6 is a correlation diagram of the drying time of the dew condensation sensor and the partition wall, Figs. 7, 8, 9, and 10 are cross-sectional views of the conventional example. FIG. 2 is a perspective view and a block diagram. In the figure, 2 is a main body casing, 5 is an exhaust passage, 8 is a blower, 17 is a dew condensation sensor, 18 is a control device, 32 is a timer circuit, and 37 is an operation stop switch. In other figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A control device that controls the operation and stopping of a blower based on a condensation signal output by a condensation sensor, and an automatic return type operation stop switch that temporarily stops the blower. A ventilation fan characterized by being equipped with. (2) The ventilation fan according to claim 1, wherein the operation stop switch is configured to be operated from within the room being ventilated.