JPH0470537B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a bathroom ventilation fan that automatically ventilates a bathroom according to humidity using a dew condensation sensor whose electrical characteristics change depending on humidity. The invention relates to an automatic driving device.

[Prior Art] The above-mentioned conventional device is disclosed in, for example, Japanese Patent Application Laid-Open No. 1986-
The configuration is as disclosed in Japanese Patent No. 156134, that is, as shown in FIG. In the figure, 1 is a DC power supply, 2 is a dew condensation sensor, and this dew condensation sensor 2
has a characteristic that the resistance value is low in areas with low humidity, and the resistance value increases significantly when the relative humidity becomes 90% or higher. Also, 3 is a comparator IC, 4
is a transistor, and 5 is a relay coil, which turns the relay contact 6 ON and OFF. In addition, 7 to 13 are resistors, 14 is a ventilation fan, 15 is an AC power supply, 16 is a seesaw switch, and 17 and 18 are the midpoints OFF.
The contact point 18 is for manual operation, and the contact point 17 is for automatic operation. Furthermore, 19 is a diode.

Next, the operation of this electric circuit will be explained.
First, if the seesaw switch 16 is connected to the contact 18 and is in the manual operating state, the AC power source 15 is directly supplied to the ventilation fan 14 and the operating state is entered, regardless of the operation of the dew condensation sensor 2 due to humidity.
Further, when the seesaw switch 16 is at the midpoint OFF point, the AC power source 15 is not supplied to the ventilation fan 14, and the operation is in a stopped state. Next, when the seesaw switch 16 is connected to the contact 17 and is in the automatic operation state, when the humidity in the bathroom is low, the resistance value of the condensation sensor 2 is low, and the resistance value of the condensation sensor 2, resistors 7 and 10, and DC power supply 1 is The non-inverting input voltage of comparator IC3 determined by resistor 8,
9. Comparator IC determined by DC power supply 1
Since it is lower than the inverting input voltage of 3, the comparator
The output of IC3 is LOW. Therefore, transistor 4 remains OFF, no current flows through relay coil 5, and relay contact 6 remains open.
The AC power source 15 is not supplied to the ventilation fan 14 and its operation is stopped.

However, the humidity in the bathroom became high and the condensation sensor 2
As the resistance of
When the inverted input voltage set in 9 is exceeded, the output of comparator IC3 becomes HIGH. As a result, transistor 4 is connected via resistors 11, 12, 13.
When turned on, current flows through relay coil 5 and relay contact 6 closes. Therefore, the AC power source 15 is supplied to the ventilation fan 14 via the contact 17 of the seesaw switch 16 and the relay contact 6, and the ventilation fan 14 is put into operation. At this time, the output of the comparator IC3 becomes HIGH and at the same time the output of the comparator IC3 becomes HIGH.
Since the non-inverting input voltage of No. 3 is raised by a certain voltage, chattering of the output of the comparator IC 3 can be prevented, and hysteresis is given to the set humidity when the ventilation fan is stopped from operating.

On the other hand, when the ventilation fan 14 is operated and the humidity in the bathroom decreases, the resistance value of the dew condensation sensor 2 decreases, but due to the hysteresis effect of the resistor 10 described above,
When the humidity becomes lower than the set humidity when the ventilation fan 14 is started from stopped, the output of the comparator IC3 is reversed again, and the operation of the ventilation fan 14 is stopped.

Thereafter, when the humidity in the bathroom increases, the ventilation fan 14 is operated, and when the humidity decreases, the operation of the ventilation fan 14 is stopped, and the operation and stop are automatically repeated. Note that the diode 19 is for absorbing the back electromotive force of the relay coil 5.

[Problems to be Solved by the Invention] The conventional automatic operating device for a bathroom ventilation fan is configured as described above, and automatically starts and stops repeatedly depending on whether or not the condensation sensor 2 detects a humidity higher than the set humidity. However, the characteristics of the dew condensation sensor 2 are generally 90% relative humidity.
% or less, there is little change in resistance value, so the set value of the relative humidity at which the ventilation fan 14 should be operated is set to 90%.
If it is difficult to set the setting below, and even if the walls etc. are not sufficiently dry, if the humidity in the bathroom stabilizes at 90% or less, the ventilation fan 14 will not be operated again, causing mold growth and damage due to humidity. There was a problem that prevention was not sufficient.

Further, when the dew condensation sensor 2 repeatedly detects and fails to detect dew condensation in a short period of time, which is called chattering, the ventilation fan 14 is repeatedly stopped and its operation becomes unstable.

This invention was made in order to solve these conventional problems, and it is possible to sufficiently dry the liquid level in the bathroom, prevent the growth of mold and damage on the wall surface as much as possible, and make it stable. To provide an automatic operation device for a bathroom ventilation fan that can operate the ventilation fan for an appropriate time.

[Means for Solving the Problems] An automatic operation device for a bathroom ventilation fan according to the present invention includes a sensor change amount calculation means for calculating the amount of change in a detected value of a dew condensation sensor, and the sensor change amount calculation means when the ventilation fan is stopped. an operation start means for operating the ventilation fan when the amount of change per a certain period of time reaches a predetermined value; and an operation stop means for stopping the ventilation fan after a predetermined time has elapsed from the start of operation of the ventilation fan; The operating time of the ventilation fan specified by the means is the period from when the ventilation fan is operated by the operation start means until the amount of change in the detection value of the condensation sensor calculated by the sensor change amount calculation means shifts to the low humidity side. This is determined by a driving time calculation means that calculates based on time.

[Operation] In this invention, the amount of change in the detected value of the condensation sensor when the ventilation fan is not operating is calculated, and when the amount of change reaches a predetermined value, the ventilation fan is operated, and when the ventilation fan starts operating, the corresponding The operation of the ventilation fan can be continued for a time corresponding to the time when the amount of change in the dew condensation sensor increases during operation of the ventilation fan, and then stopped. In other words, the ventilation fan starts operating when the detection value of the condensation sensor rises rapidly, controls the operation of the ventilation fan according to the time until the detection value of the condensation sensor decreases, and performs ventilation movements according to the condensation state. can do.

[Embodiment] Figures 1, 2, 3, and 4 all show an automatic operation device for a bathroom ventilation fan as an embodiment of the present invention, and the overall configuration in Figure 1 is As is clear from the figure, the condensation sensor 2 is tested by the condensation sensor test means 22 in a short period of time (for example, 6 seconds) after the power is first turned on for the control circuit 20 that controls on/off operation of the ventilation fan. Thereafter, the forced operation means 23 forces the ventilation fan 14 to operate for, for example, 180 minutes after the initial energization. After the forced operation, the amount of change in the detected value of the dew condensation sensor 2 is measured, and the amount of change in the detected value is input to the change amount calculation means 24 via the dew condensation sensor input circuit 21. The change calculation means 24 calculates the difference between the previously input detection value of the dew condensation sensor 2 and the newly input detection value of the dew condensation sensor 2, and when the value reaches a predetermined value, the operation start means 26 Output to. Operation start means 2
6 outputs a signal for starting the ventilation fan 14 to the control circuit 20, thereby starting the ventilation fan 14. The operating time calculation means 25 multiplies the time during which the detection value of the condensation sensor 2 increases by x, for example, 25, while the ventilation fan 14 is operating, and when the value is below the lower limit, for example, 30 minutes or less, When the lower limit value, i.e. 30 minutes, is greater than the upper limit value, for example 180 minutes or more, the upper limit value,
That is, the operation time is calculated to 180 minutes, and when the operation time reaches this time, it is output to the operation stop means 27, and the operation stop means 27 outputs a signal to the control circuit 20 to stop the ventilation fan 14. stops. Further, even if the amount of change in the detected value of the dew condensation sensor 2 does not reach a predetermined value, if the value of the dew condensation sensor 2 reaches a predetermined value, for example 93%, the operation start means 26 is activated, and the control circuit 20 outputs a signal to start 14.

FIG. 2 is an electric circuit diagram showing the specific configuration of FIG. 1, and in the same figure, 2, 14, and 15 are the same components as in the conventional example shown in FIG. 4. 20 is a control circuit, which includes a diode bridge DB, a resistor R1,
R2, R3, capacitor C1 and thyristor
It is composed of SCR. 21 is a dew condensation sensor input circuit, which includes dew condensation sensor 2, resistors R4, R5, R
15, a capacitor C2, and a transistor Q1. That is, after turning on the transistor Q1 and discharging the charge in the capacitor C2,
The value of the dew condensation sensor 2 is measured by charging the capacitor C2 with the dew condensation sensor 2 and measuring the time until the potential reaches the threshold voltage of the D1 port of the microcomputer 32. 28 is a power switch, 29 is a power circuit,
Resistors R6, R7, R8, diodes D2, D3,
Capacitors C3, C4, constant voltage diode ZD1,
It is composed of a transistor Q2 and a surge absorber SA. 31 is a reset circuit, which is composed of resistors R11, R12, R13, a capacitor C5, and a transistor Q3. 32 is the first
A microcomputer that executes the operations shown in the figure oscillates using a resistor R14 and a built-in capacitor to generate a system clock.

Next, the operation will be explained with reference to a flowchart showing the ventilation fan control program stored in the memory of the microcomputer 32 shown in FIG.

First, when the power switch 28 is closed, the AC power supply 15 is connected to the device, the power supply circuit 29 supplies DC power to the microcomputer 32, the output of the reset circuit 31 changes from L level to H level, and the microcomputer 32 operates. starts. In the first step 33, the microcomputer 32 initializes the built-in RAM, input/output ports, etc. Next, in step 34, the rising edge of the power frequency input from the power frequency input circuit 30 is detected, and only when a rising edge is detected, the process proceeds to the next step, and in other cases, a loop is formed until the rising edge is detected. That is, one loop of processing is performed every one cycle of the power supply frequency (in this example, it is 1/55 seconds because it is shared between 50 Hz and 60 Hz). When the rise of the power supply frequency is detected, the value ψ _o of the dew condensation sensor 2 is measured in step 42 and stored in the memory.
Then, after the power switch 28 is closed, steps 35 to 36 are performed for a predetermined period of time, for example, 6 seconds.
In order to test the dew condensation sensor 2, if the value _ψo of the dew condensation sensor 2 from the dew condensation sensor input circuit 21 is less than the predetermined value ψMAX (for example, 93%), the process proceeds to step 37.
The process proceeds to step 38, where the SCR of the control circuit 20 is turned on, and if this value is exceeded, the process proceeds to step 38, where an operation is performed to turn off the SCR (condensation sensor test means 22). This is to simplify the test of the dew condensation sensor 2 during production of the device, since it is programmed to perform forced operation for 180 minutes when the power is first turned on. If this were not done, the test of the condensation sensor 2 would only be possible after 180 minutes of operation. When the 6 seconds for the test have passed, the process advances from step 35 to step 39, and in order to perform forced operation for 180 minutes at the time of first energization, T1 is set to 180 minutes in step 40 only at the initial stage, and in step 41. Turn on SCR. By performing this forced operation for 180 minutes, manual operation similar to a normal ventilation fan can be performed only by operating the power switch 28, and after 180 minutes, the operation is switched to automatic operation using the dew condensation sensor 2. Condensation sensor 2 during forced operation
does not detect the condensation state, so in step 43, the difference between the previous detection value of the dew condensation sensor 2 and the new detection value at that point is calculated to determine the amount of change to determine whether the humidity is increasing or decreasing. Find △ψ＝ψ _o
-ψ _o-1 is calculated, and since the ventilation fan 14 is operating, proceed from step 48 and step 44 to step 45, and reduce the ventilation fan operating time by 1/55 seconds for each loop.
Process T1←T1−1/55 seconds. That is, 1/55 second is subtracted from T1 for each loop, and when T1 becomes 0 or less, the process proceeds to step 47, where the SCR is turned off and the ventilation fan 14 is stopped. When the amount of change △ψ calculated in step 43 after the ventilation fan 14 is stopped reaches a predetermined value α or more, that is, when the amount of change in the humidity in the bathroom changes to the high humidity side by more than the predetermined value, steps 49 to 50 are performed. Go to , turn on the SCR and operate the ventilation fan 14.

With this process, even if the humidity in the bathroom is low, when the humidity rises due to steam in the bathroom, the ventilation fan is activated before dew condenses in the bathroom.
Prevents condensation in the bathroom.

Furthermore, even if the amount of change △ψ is less than the predetermined value α, if the detected value _ψo of the dew condensation sensor 2 at that point exceeds the preset allowable humidity ψMAX, the process proceeds from step 54 to step 50 and turns on the SCR. Then, the ventilation fan 14 is operated. When the SCR is turned on in this way, the process proceeds from step 48 to step 44, and when Δψ is greater than 0, that is, when the humidity in the bathroom is rising, the process proceeds to step 52, where the process T1←T1+X/55 seconds is performed.

As a result of this process, if T1 is less than 30 minutes, it is corrected to the minimum time of 30 minutes, and if it is more than 180 minutes, it is corrected to the maximum time of 180 minutes (step 53).
5). The operation time calculating means 25 calculates the ventilation in the bathroom based on the time from when the humidity in the bathroom increases and the ventilation fan starts operating until the humidity in the bathroom decreases, that is, until △ψ<0. A time is determined, which is the optimal ventilation time to prevent condensation in the bathroom. Note that the value of X used in calculating the above-mentioned ventilation fan operating time was selected as the optimal value of 25 based on the results of various experiments using bathroom ventilation fans.

T1 calculated through this process is the step
At step 45, 1/55 seconds per loop, that is, the actual operating time of the ventilation fan 14, is reduced, and when T1 becomes 0 or less, the process proceeds from step 46 to step 47, and the SCR is turned off (operation stop means 27).

Note that the forced operation time of 180 minutes, the maximum ventilation fan operation time of 180 minutes, the minimum time of 30 minutes, the value of the proportionality constant x, etc. in the above embodiment are merely examples. Further, the dew condensation sensor input circuit 21 can be implemented not only by using the charging time of the capacitor C2 but also by using an AD converter. Further, although △ψ was calculated using ψ _o −ψ _o-1 , it can also be realized using ψ _o /ψ _o-1 using the same concept.

[Effects of the Invention] As is clear from the above description of the embodiments, the automatic operation device for a bathroom ventilation fan of the present invention includes a sensor change amount calculation means for calculating the amount of change in the detected value of the dew condensation sensor, and an operation start means for operating the ventilation fan when the amount of change per fixed time in the sensor change amount calculation means reaches a predetermined value; and an operation stop means for stopping the ventilation fan after a predetermined time has elapsed from the start of operation of the ventilation fan. , the operating time of the ventilation fan specified by the operation start means and the operation stop means is determined by the amount of change in the detection value of the condensation sensor calculated by the sensor change amount calculation means after the operation of the ventilation fan is started by the operation start means. Since this is determined by an operating time calculation means that calculates the time until the humidity changes to the low humidity side, it is different from a condensation countermeasure method that simply operates the ventilation fan when the humidity reaches a predetermined value. The amount of change in the detection value of the condensation sensor when the ventilation fan is not operating is calculated, and when the amount of change reaches a predetermined value, the ventilation fan is operated, and when the ventilation fan starts operating, it is calculated based on the amount of change in humidity at the point in time. Since the ventilation fan is operated, it is possible to prevent condensation in advance before it becomes condensed, which not only enables more effective prevention and prevention of condensation, but also increases the amount of change in the condensation sensor when the ventilation fan is operated. It is possible to continue operation for a certain amount of time and then stop it. In other words, the ventilation operation is carried out for the necessary time depending on the actual dew condensation state, so it is possible to ensure and sufficiently dry the walls of the bathroom, and to prevent the growth of mold and damage on the walls as much as possible. In addition to this, the ventilation fan has the unique effect of being able to provide efficient and economical ventilation since the ventilation movement cannot be performed more than necessary.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a circuit diagram showing the electric circuit of the embodiment,
FIG. 3 is a flowchart showing the operation, FIG. 4 is an explanatory diagram of the operation, and FIG. 5 is a circuit diagram showing a conventional electric circuit. In the figure, 2 is a dew condensation sensor, 14 is a ventilation fan, 20 is a control circuit, 21 is a dew condensation sensor input circuit, 24 is a change amount calculation means, 25 is an operation time calculation means, 26 is an operation start means, 26 is an operation start means, 27 is an operation stop means, 28 is a power switch, 29 is a power circuit, 30 is a power frequency input circuit, and 32 is a microcomputer. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A bathroom in which a dew condensation sensor for detecting humidity in the bathroom is provided in an electric circuit that operates a ventilation fan installed in the bathroom, and the operation of the ventilation fan is controlled according to the amount of change in the detected value of the dew condensation sensor. The automatic operation device for a ventilation fan includes a sensor change amount calculation means for calculating the amount of change in the detection amount of the dew condensation sensor, and a change amount of the sensor change amount calculation means when the ventilation fan is stopped reaches a predetermined value. the ventilation fan; and an operation stop means that stops the ventilation fan after a predetermined time has elapsed since the start of operation of the ventilation fan. The operation time of the ventilation fan is the time from when the ventilation fan is operated by the operation start means until the amount of change in the detected value of the dew condensation sensor calculated by the sensor change amount calculation means shifts to the low humidity side. An automatic operation device for a bathroom ventilation fan, characterized in that the determination is made by an operation time calculation means that calculates based on the operation time. 2. The operating time of the ventilation fan specified by the operation start means and the operation stop means, and the amount of change in the detection value of the condensation sensor calculated by the sensor change amount calculation means after the ventilation fan is operated is on the low humidity side. 2. The automatic operation device for a bathroom ventilation fan according to claim 1, wherein the time until the fan falls is determined based on the power supply frequency.