JPS6380139A - Circuit for preventing dew condensation of ventilation fan - Google Patents

Abstract

PURPOSE:To increase positive prevention of the dew condensation of a ventilation fan by a method wherein an output from a condensation sensing part having a plurality of condensation sensors connected in series which show a rapid increase in resistance under a humidity condition of higher than a dew point is inputted to a comparator and an operating circuit for a ventilation fan is closed when the output exceeds a reference input voltage. CONSTITUTION:An output from a condensation sensing part 7 and a reference input voltage are compared with each other by an IC comparator 2 so as to constitute control signal for turning on or off the power supply circuit for a ventilation fan 5. The condensation sensing part 7 has a plurality of condensation sensors 1 connected in series which present a low resistance value under a humidity condition in no excess of the condensation point and show a rapid increase in resistance value when the humidity is more than the condensation point. When any one of the condensation sensors 1 is set at a condensation condition, an entire composite resistance value also exceeds highly a resistance value RSD of a condensation sensing level. A resistance value RSD at the condensation sensing level is a reference input voltage to be inputted to the IC comparator 2, and a voltage divided by a resistor 14 and the composite resistance of each of the condensation sensors 1 is inputted to one of the terminals of the IC comparator 2. If one condensation sensor 1 is set at a sensing level, a ventilation fan 5 may start to perform a ventilation work.

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, Jitsukai Showa 5
This is as disclosed in Japanese Patent No. 8-156134. That is, as shown in FIG. 5, the dew condensation sensor 1. IC comparator 2° 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 its change is small in a region of low humidity, but when the relative humidity exceeds a 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. Relay 4 is activated by conduction of transistor 3.
is excited, and by closing the contact 6, the AC circuit that supplies power to the ventilation fan 5 is closed, 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 and conditions of actual bathrooms, etc. For example, a bathroom is not a space made up of walls with different structures and conditions; 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. There are some. Such events that affect the actual occurrence of dew condensation cannot be dealt with by a conventional circuit that is simply equipped with a single dew condensation sensor 1, 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 is highly reliable in preventing dew condensation.

[Means for solving the problem] The dew condensation prevention operation circuit for a ventilation fan according to the present invention exhibits an extremely low resistance value under humidity conditions below the dew point, and a rapid increase in resistance value under humidity conditions above the dew point. A dew condensation detector is constructed by connecting a plurality of condensation sensors in series, and the output of this dew condensation detector is input to a comparator to which a reference input voltage is applied, and the output of the dew condensation detector is set to the reference input voltage. The configuration is such that the operating circuit of the ventilation fan is closed when the temperature exceeds this level.

[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. Since it indicates a sudden increase in resistance value, dew condensation sensors can be activated in several locations, and if one or more of the dew condensation sensors detects a detection operation, the ventilation fan can be automatically operated based on that detection. .

[Example] Figure 1, Figure 2, Figure 3, and Figure 4 all show an example of the present invention.9 The condensation prevention operation circuit for a ventilation fan of this example detects dew condensation. The dew condensation detection section 7 has structural and circuit configuration features, and the output of the dew condensation detection section 7 and the reference input voltage are compared with the IC comparator 2, which is a comparator, and a control signal for opening/closing the power supply circuit of the ventilation rA5 is generated. The circuit configuration and operation related to the configuration are the same as those of the conventional example described above. Therefore, parts that overlap with those of the conventional example are designated by the same reference numerals in the drawings, and detailed description thereof will be omitted.

That is, the condensation detection section 7 of the condensation prevention operation circuit of this example 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. It is constructed by connecting sensors 1 in series. Each dew condensation sensor 1 is structurally independent, and is configured as a part of the dew condensation detection section 7 in terms of t'rC. 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. The dew condensation detection section 7 is configured by connecting the connector 11. Further, electrically, a feature is that a plurality of devices connected in series can work individually to move the ventilation fan 5, rather than as a whole. That is, as shown in FIG. 3, the dew condensation sensor 1 exhibits an extremely low resistance value under humidity conditions that do not exceed its 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 (which may be 2, 3 or 4) is sufficiently smaller than the resistance value RsD at the dew condensation detection level when there is no condensation condition; When the resistance value of one of the elements increases, the total combined resistance value also greatly exceeds the resistance value RsD at the dew condensation detection level. The resistance value RsD at the dew condensation detection level is input to the IC comparator 2 as a voltage divided by a resistor 12.13. 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. μ of condensation sensor 1 is 2
There may be one, three, or four terminals, and the remaining terminals in the dew condensation detection section 7 may be connected to the shorting 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, there are wall surfaces W1 that are in contact with the outside air and wall surfaces W2 that are in contact with the room, and there are variations in position that affect the actual occurrence of condensation in bathrooms that are structurally made of concrete or synthetic building materials. Condensation prevention can be carried out by capturing certain individual events, increasing the reliability of dew condensation prevention.

[Effects of the Invention] As is clear from the above description of the embodiments, in the dew condensation prevention operation circuit for a ventilation fan of the present invention, the dew condensation detection section is constituted by a series circuit of a plurality of dew condensation sensors, and each dew condensation sensor detects the dew point. Since it 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, dew condensation sensors can be used in several locations, one of which is If the above-mentioned detection operation of the dew condensation sensor is performed, the ventilation fan can be automatically operated based on the detection operation. Therefore, there are some wall surfaces that are in contact with the outside air, and there are wall surfaces that are in contact with the room, and there are variations in position that affect the actual occurrence of condensation in bathrooms, etc., which are structurally made of concrete or synthetic building materials. Condensation prevention can be carried out based on a specific individual phenomenon, increasing the reliability of condensation prevention.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing the configuration as an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the external structure of the same, 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 view 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 detection unit, and 11 is a connector. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (2 people at Ike) Figure 2

Claims (3)

[Claims] (1) The dew condensation detection unit is constructed by connecting multiple condensation sensors in series, which exhibit extremely low resistance under humid conditions that do not exceed the dew point, but exhibit a rapid increase in resistance under humid conditions that exceed the dew point. The output of the condensation detector is input to a comparator to which a reference input voltage is applied, and when the output of the dew condensation detector exceeds the reference input voltage, the operating circuit of the ventilation fan is closed. Condensation prevention operation circuit for ventilation fans. (2) The dew condensation prevention operation circuit for a ventilation fan according to claim 1, which is configured to be able to change the number of dew condensation sensors in the dew condensation detection section. (3) The dew condensation prevention operation circuit for a ventilation fan as set forth in 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.