JPH0438979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dew condensation prevention operation circuit for a ventilation fan for automatically preventing dew condensation in bathrooms, warehouses, refrigerators, and the like.

[Prior Art] There have been operating circuits that detect humidity with a sensor and control the operation of a ventilation fan based on the detected humidity.
For example, this is disclosed in Japanese Utility Model Application Publication No. 156134/1983. That is, as shown in FIG. 5, a dew condensation sensor 1, an IC comparator 2, a transistor 3,
This is a DC circuit mainly composed of the relay 4 and the relay 4, which controls the opening and closing of the AC circuit that supplies power to the ventilation fan 5. The dew condensation sensor 1 has a characteristic that the resistance value is small and changes little in a region of low humidity, but when the relative humidity exceeds a certain value, the resistance value increases with a large change. The IC comparator 2 compares the reference input voltage with the output voltage of the dew condensation sensor 1, and when the latter exceeds the former, outputs an output to make the transistor 3 conductive. The relay 4 is energized by the conduction of the transistor 3, and the closing of the contact 6 closes the AC circuit that supplies power to the ventilation fan 5, and ventilation operation is performed.

[Problems to be Solved by the Invention] The conventional ventilation fan operating circuit described above cannot capture variations in the occurrence of condensation due to differences in the structure or situation of an actual bathroom or the like. For example, a bathroom is not a space made up of walls of uniform structure and condition; some walls are in contact with the outside air, while others are in contact with the room, and the structure is made of concrete or synthetic building materials. It feels hot. The conventional circuit, which only has a single fixed dew condensation sensor 1, cannot deal with such events that affect the actual occurrence of dew condensation, and the function of preventing dew condensation is incomplete.

This invention was made in order to solve such conventional problems, and it is based on the understanding of individual phenomena that vary depending on the position that determines the actual occurrence of dew condensation in the place where dew condensation should be prevented. It is an object of the present invention to obtain a dew condensation prevention operation circuit for a ventilation fan that works to prevent dew condensation in the entire place where dew condensation should be prevented and that is highly reliable in preventing dew condensation.

[Means for solving the problem] The condensation prevention operation circuit for a ventilation fan according to the present invention has the following features:
A dew condensation detection unit is constructed by connecting multiple condensation sensors in series, each installed at a different location, exhibiting an extremely low resistance value under humidity conditions that do not exceed the dew point, and a rapid increase in resistance value under humidity conditions that exceed the dew point. The output of the condensation detection section is input to a comparator to which a reference input voltage is applied, and the operating circuit of the ventilation fan is closed when the output of the condensation detection section exceeds the reference input voltage. It is.

[Function] In the present invention, the dew condensation detection section is configured by a series circuit of a plurality of dew condensation sensors, and each dew condensation sensor exhibits an extremely low resistance value under humidity conditions below the dew point, and exhibits an extremely low resistance value under humidity conditions above the dew point. This indicates a rapid increase in resistance value, and since they are connected in series, it is possible to obtain a rapid change in resistance value near the dew point, and the dew condensation sensor can work in several locations. If there is a detection operation of one or more of the dew condensation sensors, the ventilation fan can be automatically operated based on the detection operation.

[Embodiment] FIG. 1, FIG. 2, FIG. 3, and FIG. 4 all show an embodiment of the present invention. The dew condensation prevention operation circuit for the ventilation fan of this example has structural and circuit configuration features in the dew condensation detection section 7 that detects dew condensation.
The circuit configuration and operation are different from the conventional example described above in that the output of the dew condensation detector 7 and the reference input voltage are compared by the IC comparator 2, which is a comparator, and a control signal for opening and closing the power supply circuit of the ventilation fan 5 is configured. do not have. Therefore, the same reference numerals are used in the drawings to refer to parts that overlap with those of the conventional example, and detailed explanations thereof will be omitted.

That is, the dew condensation detection section 7 of the dew condensation prevention operation circuit of this example
is constructed by connecting a plurality of dew condensation sensors 1 in series, exhibiting an extremely low resistance value under humidity conditions below the dew point, and exhibiting a rapid increase in resistance value under humidity conditions above the dew point. Each dew condensation sensor 1 is structurally independent, and electrically constitutes a part of the dew condensation detection section 7. In terms of structure, each dew condensation sensor 1 has a sensor main body 10 built into a case 9 having an adhesive surface 8 that can be attached to a wall, as shown in FIG. 2, and an extension lead with a connector 11 attached to the outside. Connector 11
The feature is that the dew condensation detection section 7 is configured by the connection. Further, electrically, a feature is that a plurality of devices connected in series can operate individually to move the ventilation fan 5, rather than as a luxury. That is,
As shown in Figure 3, the dew condensation sensor 1 exhibits an extremely low resistance value under humidity conditions that do not exceed the dew point, and exhibits a rapid increase in resistance value under humidity conditions that exceed the dew point. The combined resistance of the dew condensation sensor 1 (sometimes three or four) is sufficiently smaller than the resistance value RsD at the dew condensation detection level when there is no condensation condition, and even one of them is placed under dew condensation condition. And, due to the increase in the resistance value of one of them, the total combined resistance value also becomes the resistance value at the dew condensation detection level.
It will be much more than RsD. The resistance value RsD at the dew condensation detection level is input to the IC comparator 2 as a voltage divided by resistors 12 and 13.
This is a reference input voltage, and the voltage divided by the combined resistance of the resistor 14 and each dew condensation sensor 1 is input to the other terminal of the IC comparator 2. The number of dew condensation sensors 1 may be two, three, or four, and the remaining terminals in the dew condensation detection section 7 may be connected to short-circuit leads 15 to short-circuit them.

For example, if several dew condensation sensors 1 are placed in a bathroom with a structure as shown in FIG. 5 will be in ventilation operation. Therefore, the wall surface W1 in contact with the outside air
There is also a wall surface W2 that touches the room, and the structure is made of concrete or synthetic building materials.Individual events that vary depending on the position that affect the actual occurrence of condensation in the bathroom. It is possible to prevent condensation by capturing it, increasing the reliability of preventing condensation.

[Effects of the Invention] As is clear from the above description of the embodiments, in the condensation prevention operation circuit for a ventilation fan of the present invention, the condensation detection section is configured with a series circuit of a plurality of dew condensation sensors,
Each dew condensation sensor exhibits an extremely low resistance value under humidity conditions that do not exceed the dew point, and a rapid increase in resistance value under humidity conditions that exceed the dew point, so it is possible to use a dew condensation sensor in several locations. I can,
If there is a detection operation of one or more of the dew condensation sensors, the ventilation fan can be automatically operated based on the detection operation. Therefore, there are variations in position that affect the actual occurrence of condensation in bathrooms, etc., where some walls are in contact with the outside air and others are in contact with the room, and the structure is made of concrete or synthetic building materials. It is possible to prevent condensation by capturing certain individual events, and since each condensation sensor can be connected in series, even if the number of condensation sensors increases or decreases, a sudden change in resistance value near the condensation point can be obtained, preventing condensation. The certainty of

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing the configuration of an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the external structure thereof, and Fig. 3 is an explanatory diagram showing the relationship between the resistance value of the dew condensation sensor and humidity. , FIG. 4 is an explanatory diagram showing an embodiment installed in a bathroom, and FIG. 5 is a circuit diagram showing a conventional electric circuit. In the figure, 1 is a dew condensation sensor, 2
is an IC comparator, 3 is a transistor, 5 is a ventilation fan, 7 is a dew condensation detector, and 11 is a connector.
Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1 A plurality of dew condensation sensors installed at different locations exhibiting an extremely low resistance value under humidity conditions that do not exceed the dew point, and exhibiting a rapid increase in resistance value under humidity conditions that exceed the dew point. They are connected in series to form a condensation detection section, and the output of this condensation detection section is input to a comparator to which a reference input voltage is applied, and when the output of the condensation detection section exceeds the reference input voltage, the operation circuit of the ventilation fan is activated. A condensation prevention operation circuit for a ventilation fan, characterized in that it is configured to close. 2. The dew condensation prevention operation circuit for a ventilation fan according to claim 1, having a configuration in which the number of dew condensation sensors in the dew condensation detection section can be changed. 3. The dew condensation prevention operation circuit for a ventilation fan according to claim 1 or 2, wherein each dew condensation sensor is connected to the dew condensation detection section by a connector and can be freely installed in the detection target area.