JPH0470535B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a bathroom ventilation fan that detects the humidity in a bathroom using a dew condensation sensor and controls the operation of the ventilation fan depending on whether or not humidity is detected to be higher than the set humidity of the sensor. Regarding automatic driving equipment.

[Prior Art] Fig. 5 is a circuit diagram showing a conventional automatic operation device for a bathroom ventilation fan disclosed in, for example, Japanese Unexamined Patent Publication No. 58-156134. In the figure, 1 is a DC power supply, 2 is a dew condensation sensor, As shown in the characteristic diagram of FIG. 6, this dew condensation sensor 2 has a characteristic that the resistance value is small in an area of low humidity, and the resistance value increases significantly when the relative humidity becomes 90% or more. Also, 3 is a comparator IC,
4 is a transistor, 5 is a relay coil, and 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,
17 and 18 are contacts of a seesaw switch with a center point OFF, contact 18 indicates the time of manual operation, and 17 indicates the contact during automatic operation. Furthermore, 19 is a diode.

Next, the operation in FIG. 5 will be explained.
First, if the seesaw switch 16 is connected to the contact point 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, a case will be described in which the seesaw switch 16 is connected to the contact 17 and is in an automatic movement state.

Here, when the humidity in the bathroom is low, the condensation sensor 2
has a low resistance value, and the condensation sensor 2 and resistors 7 and 1
0, comparator IC determined by DC power supply 1
Since the non-inverting input voltage of the comparator IC3 is lower than the inverting input voltage of the comparator IC3 determined by the resistors 8 and 9 and the DC power supply 1, the output of the comparator IC3 is "Low". Therefore, transistor 4 is
It remains OFF, no current flows through the relay coil 5, the relay contacts 6 are open, and the AC power source 15 is not supplied to the ventilation fan 14, so the operation is stopped.

However, the humidity in the bathroom became high and the condensation sensor 2
As the resistance increases, the non-inverting input voltage of comparator IC3 increases, and when this non-inverting input voltage exceeds the inverting input voltage set by resistors 8 and 9,
The output of comparator IC3 becomes "High". As a result, transistor 4 is turned on via resistors 11, 12, and 13, current flows through relay coil 5, and relay contact 6 is closed. Therefore, AC power supply 15
is supplied to the ventilation fan 14 via the seesaw switch 16, contact 17, and 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 non-inverting input voltage of the comparator IC3 is raised by a certain voltage through the resistor 10, so the output of the comparator IC3 becomes "High".
In addition to preventing the output from chattering, this also provides hysteresis to the set humidity when the ventilation fan is turned on and off.

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 effect of the hysteresis resistor 10,
When the humidity becomes lower than the set humidity when the ventilation fan 14 is switched from stop to operation, 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 operation device for bathroom ventilation fans is configured as described above, and the device automatically starts and stops repeatedly depending on whether or not the condensation sensor detects humidity higher than the set humidity. The humidity in the bathroom can be lowered due to the relative humidity being increased, but the characteristics of the condensation sensor are generally
Since there is little change in resistance in the following areas, it is difficult to set the condensation sensor setting to 90% or less, and even if the walls are not sufficiently dry, the humidity in the bathroom remains stable at 90% or less. There was a problem that once the ventilation fan was put away, it was not necessary to run it again, and the prevention of mold growth and damage due to humidity was not sufficient.

Also, if the condensation sensor repeatedly detects and does not detect condensation in a short period of time, so-called chattering,
In response to this, there was a problem in that the ventilation fan was repeatedly stopped and operated, resulting in unstable operation.

This invention was made to solve the above-mentioned problems, and it can sufficiently dry the walls of the bathroom, prevent the growth of mold and damage on the walls, and can be expected to operate stably. The purpose is to obtain an automatic operation device for bathroom ventilation fans.

[Means for Solving the Problems] The automatic operation device for a bathroom ventilation fan according to the first aspect of the present invention is configured such that if the detection time is longer than the set humidity of the dew condensation sensor during operation of the ventilation fan, It is equipped with means for calculating the ventilation fan operation time, which has a functional relationship that is a predetermined proportional relationship where the longer the shorter the time, the shorter it is, and the means for operating the ventilation fan for the operation time calculated by this means and then stopping it. be.

An automatic operation device for a bathroom ventilation fan according to a second aspect of the present invention includes means for calculating a time difference obtained by subtracting a time period in which humidity is not detected at a predetermined level from a time when a condensation sensor detects humidity at or above a predetermined humidity level when the ventilation fan is stopped; A means for starting operation of a ventilation fan by detecting a relatively short predetermined value or more that stabilizes the condensation detection state of the dew condensation sensor with a time difference, and a means for starting operation of a ventilation fan according to the detection time of the humidity exceeding the set humidity of the dew condensation sensor when operating the ventilation fan. A means for calculating ventilation fan movement time;
The ventilation fan is provided with means for operating the ventilation fan for the operating time calculated by this means and then stopping the ventilation fan.

[Function] In the first aspect of the present invention, the ventilation fan that starts operating in response to the detection of humidity equal to or higher than the set humidity of the condensation sensor has a detection time of The operation continues for an operating time that is in a predetermined proportional relationship, the longer the time, the shorter the time. In other words, even if the condensation sensor no longer detects a humidity higher than the set humidity, the ventilation fan will not be stopped immediately; for example, if the time during which the condensation sensor detects the humidity higher than the set temperature while the ventilation fan is operating is below the set lower limit value or higher than the set upper limit value. Then, between the upper limit value and the lower limit value, the ventilation fan continues to operate for a predetermined functional relationship such that the longer the detection time, the shorter the detection time. Therefore, by appropriately determining this predetermined function, it is possible to operate the ventilation fan for an optimal time depending on the state of dew condensation, thereby sufficiently drying the wall surface, etc.

In the second aspect of the present invention, when the ventilation fan is stopped, the detection time of the condensation sensor at or above the set humidity is calculated, the time during which no detection is detected is subtracted, and when the time difference reaches a predetermined value, the ventilation fan is started to operate. When the ventilation fan starts operating, the ventilation fan is operated for a time corresponding to the detection time of a predetermined humidity or more by a dew condensation sensor during operation of the ventilation fan, and then stopped. In other words, even if the condensation sensor detects a humidity higher than the set humidity, the ventilation fan will not start operating immediately, and even if it no longer detects the humidity higher than the set humidity, the ventilation fan will not be stopped immediately, and will remain inactive for the detection time when the humidity exceeds the predetermined humidity of the condensation sensor. The ventilation fan operation is controlled according to the detection time. Therefore, the operation of the ventilation fan is stable, and the operation of the ventilation fan can be optimally controlled according to the condensation state.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. As is clear from FIG. 1, in this embodiment, the ventilation fan control circuit 20 that controls ON/OFF operation of the ventilation fan is forced to operate for 180 minutes, for example, by the forced operation means 23 when the power is first turned on. Control. After the forced operation, a condensation detection signal indicating that the condensation sensor detects the set humidity, for example 90% or higher, is input from the condensation sensor input circuit 21 to the condensation detection time difference calculation means 24 when the ventilation fan is stopped, and to the operation time calculation means 25 when the ventilation fan is in operation. be done. The condensation detection time difference calculation means 24 calculates the difference between the condensation detection time when the ventilation fan is stopped and the time when no condensation is detected, and when the difference reaches a predetermined value, for example 15 seconds, the operation start means 26 starts the operation of the ventilation fan. The ventilation fan control circuit 20 is controlled to start. The operation time calculation means 25 multiplies the dew condensation detection time during ventilation fan operation by x times, for example, 25 times, and sets the value to a lower limit value, for example, 30 minutes if it is less than 30 minutes, and to an upper limit value, for example, 180 minutes if it is more than 180 minutes. The ventilation fan control circuit 20 is controlled by the operation stop means 27 to calculate the operating time and to stop the ventilation fan when the actual operating time of the ventilation fan reaches the calculated operating time.

FIG. 2 is a circuit diagram showing the electrical circuit of the embodiment shown in FIG.
20 is the ventilation fan control circuit shown in Figure 1, which includes a diode bridge DB, resistors R ₁ , R ₂ , R ₃ and a capacitor.
It consists of _C1 and thyristor SCR. 2
1 is a dew condensation sensor input circuit similarly shown in FIG. 1, which is composed of a dew condensation sensor 2, resistors R ₄ , R ₅ , diode D ₁ , capacitor C ₂ and transistor Q ₁ ;
The detected humidity is determined by the constant of the resistor _R5 and the characteristics of the dew condensation sensor 2. 28 is a power switch, 2
9 is a power supply circuit, which includes resistors R ₆ , R ₇ , R ₈ and diodes.
D ₂ , D ₃ , capacitor C ₃ , C ₄ , constant voltage diode
Consists of ZD, transistor Q ₂ and surge absorber SA, 30 is the power frequency input circuit and resistor
It consists of R ₉ , R ₁₀ , diode D ₄ , and 31 is a reset circuit, which includes resistors R ₁₁ , R ₁₂ , R ₁₃ and a capacitor.
C ₅ and transistor Q ₃ . 32
A microcomputer (hereinafter referred to as microcomputer) for executing each means 22 to 27 shown in FIG. 1 generates an oscillating system clock using a resistor _R14 and a built-in capacitor.

Next, the operation will be explained with reference to FIGS. 3 and 4. FIG. 3 is a flowchart showing the ventilation fan control program stored in the memory of the microcomputer 32, and FIG. 4 is an explanatory diagram showing the relationship between the dew condensation detection time by the operating time calculating means 25 and the calculated ventilation fan operating time.

First, when the switch 28 is closed, the AC power supply 15 is connected to the device, and the microcomputer 3 is connected to the power supply circuit 29.
When the DC power supply is applied to 2 and the output of the reset circuit 31 changes from L (Low) to H (High),
The operation of the microcomputer 32 starts. Microcomputer 3
2, first, in step 33, the built-in RAM, input/output ports, etc. are initialized. 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, otherwise a loop is formed until the next rising edge is detected. That is, one loop of processing is performed for every one cycle of the power supply frequency (in this embodiment, it is 1/55 seconds in order to share 50 Hz and 60 Hz). When the rise of the power frequency is detected, the process proceeds to step 39, and in order to perform forced movement for 180 minutes (forced operation means 23) when first energized,
Microcomputer 3 at step 40 only at the initial stage
The ventilation fan movement time _T1 set in step 2 is set to 180 minutes, and the SCR is turned on in step 41. By performing this forced movement for 180 minutes at the time of initial energization, manual operation can be performed like a normal ventilation fan by only operating the switch 28, and after 180 minutes, the operation is switched to automatic operation using the dew condensation sensor 2. During this forced operation, the condensation sensor 2 is not in a dew condensation state, so
Proceed from step 42 and step 43 to step 44,
The ventilation fan operating time _{T 1} set to 180 minutes above is subtracted by 1/55 seconds every time _one loop passes.
When ON time T ₁ exceeds 180 minutes, T ₁ becomes 0 or less, and the process proceeds from step 45 to step 46, and the SCR is
The ventilation fan 14 is stopped by turning it OFF. When the condensation sensor input circuit 21 determines that there is condensation after the ventilation fan is stopped, the process proceeds from step 47 to step 48, where the condensation detection time difference T ₂ is set in the microcomputer 32.
T ₂ to add 1/55 seconds from 0 every time one loop passes.
← Perform the processing of T ₂ +1/55 seconds, measure the dew condensation detection time when ventilation is stopped, and if the condensation state disappears before the time reaches 15 seconds, proceed from step 47.
Proceed to step 49 and process T ₂ ←T ₂ −1/55 seconds. That is, the difference between the condensation detection time and the non-condensation detection time when the ventilation fan is stopped is calculated (condensation detection time difference detection means 24), and if this difference _T2 exceeds 15 seconds, step 50 is performed.
Proceed to step 51, turn on the SCR, and proceed to step 51.
At 52, _T2 is cleared to 0 (operation start means 26).
On the other hand, if T ₂ becomes 0 or less before reaching 15 seconds, the process proceeds from step 53 to step 54 and T ₂ is cleared to 0. The dew condensation detection time difference detection means 24 described above is effective for stabilizing the time from when the ventilation fan is next operated until the dew condensation sensor becomes in a non-condensed state. In other words, even if the dew condensation sensor detects a dew condensation state, it will not reach a stable dew condensation detection state unless it is left in the high humidity atmosphere for a while. Therefore, if the ventilation fan is operated after dew condensation is detected and the atmosphere near the dew condensation sensor changes before the condensation sensor stabilizes, the condensation sensor may become non-detecting even though the indoor humidity has not decreased, resulting in the ventilation fan being operated. The time it takes for the dew condensation sensor to reach the non-condensed state is not stable and changes due to variations in the start-up time of the ventilation fan motor, etc. Therefore, if you start operating the ventilation fan after the 15-second dew detection time difference T ₂ from dew condensation detection as described above, the condensation detection state of the dew sensor will be stable, and the condensation detection time while the ventilation fan is running will depend on the humidity in the room. It will be the correct and stable time according to the
The next operation time calculation means 25 calculates a stable time. Moreover, compared to a method that simply detects continuous dew condensation detection time, there is an advantage that even when the dew condensation sensor 2 is chattering, the time spent in the dew condensation detection state can be measured. In other words, it detects that the continuous dew condensation detection time is 15 seconds and activates the SCR.
If it turns ON, if chattering occurs repeatedly with a detection time of 15 seconds or less, the SCR will not turn ON no matter what time it is. When T ₂ > 15 and SCR turns ON, step
The process advances from step 42 to step 43, and only when the dew condensation sensor 2 is in a dew condensation state, the process advances to step 55, where the process of adding x/55 seconds to _T1 from ₀ every time one loop _passes is performed. As a result of this processing, if _T1 is less than 30 minutes, the minimum time is corrected to 30 minutes, and if it is 180 minutes or more, the maximum time is corrected to 180 minutes in step 56 (driving time calculation means 25). Furthermore, as a result of various experiments using a bathroom ventilation fan, the optimum value for x was ``25.'' The functional relationship between the dew condensation detection time and the calculated ventilation fan operating time at this time is shown in FIG. T ₁ calculated by such processing is reduced by 1/55 seconds every loop, that is, the actual operating time of the ventilation fan, in step 44, and when T ₁ becomes 0 or less, the process moves from step 45 to step 46, and the SCR is turned off. (operation stop means 27).

In the above explanation, the power supply frequency is used as the reference clock, and one cycle time is assumed to be 1/55 seconds.
This ensures that the time error is minimized whether the power supply frequency is 50Hz or 60Hz. However, no matter which area it is used in, the time will not be accurate, but this degree of error will not have a major effect on either usability or wall drying. Of course, it is obvious that 1/60 second or 1/50 second may be selected exclusively for each area.

In addition, the forced operation time in the above example is 180 minutes,
The maximum ventilation fan operating time of 180 minutes, the minimum 30 minutes, the value of the proportionality constant x, etc. are merely examples, and may be changed as appropriate depending on the capacity of the ventilation fan actually used.

Furthermore, although the basic clock in the above embodiment is determined based on the power supply frequency, it can be similarly realized by using the system clock of the microcomputer, and the power supply frequency input circuit 30 is not required. The error in oscillation is about ±30%, so a method such as ceramic oscillation is required.

[Effect of the invention] As described above, according to the first invention of the present invention,
The operation time of the bathroom ventilation fan is calculated to be the optimum value based on the time the condensation sensor detects humidity above the set value after the ventilation fan is started, so it is extremely effective in preventing mold and mildew on the bathroom walls. There are effects that can be achieved.

Further, according to the second aspect of the present invention, the operation of the bathroom ventilation fan is optimally controlled based on the detection time and non-detection time when the humidity exceeds the set humidity of the dew condensation sensor. By controlling the operation of the system, it is possible to extremely effectively prevent the growth of mold and damage on the walls of the bathroom.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing an embodiment of this invention, Fig. 2 is a circuit diagram showing an electric circuit of the embodiment, Fig. 3 is a flowchart showing its operation, and Fig. 4 is an explanation of its operation. 5 is a circuit diagram showing a conventional automatic operation device for a bathroom ventilation fan, and FIG. 6 is a characteristic diagram of a dew condensation sensor. In the figure, 2 is a dew condensation sensor, 14 is a ventilation fan,
20 is a ventilation fan control circuit, 21 is a condensation sensor input circuit, 24 is a condensation detection time difference calculation means, 25 is an operation time calculation means, 26 is an operation start means, 27 is an operation stop means, 28 is a power switch, 29 is a power supply circuit, 30 is a power frequency input circuit, and 32 is a microcomputer. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A bathroom device in which a dew condensation sensor for detecting humidity is provided in an electric circuit that operates a ventilation fan installed in a bathroom, and the operation of the ventilation fan is controlled depending on whether or not humidity is detected to be higher than a set humidity of the dew condensation sensor. In the automatic operation device for a ventilation fan, an operation start means for starting the operation of the ventilation fan in response to detection of a humidity equal to or higher than a set humidity of the condensation sensor when the ventilation fan is stopped, and a detection time of the humidity equal to or higher than the set humidity of the condensation sensor when the ventilation fan is operated. In contrast, an operating time calculating means for calculating the ventilation fan operating time in a predetermined functional relationship, the longer the detection time is, the shorter the shorter the detection time, and the operating time calculated by the above means from the start of operation of the ventilation fan. An automatic operation device for a bathroom ventilation fan, characterized in that it is equipped with an operation stop means for stopping the operation of the ventilation fan after a period of time has elapsed. 2. The automatic operation device for a bathroom ventilation fan according to claim 1, wherein the predetermined functional relationship is a proportional relationship with upper and lower limits set. 3. The automatic operation device for a bathroom ventilation fan according to claim 1 or 2, wherein the time measurement by the operation time calculation means is performed based on the period of the power supply frequency. 4. In an automatic operation device for a bathroom ventilation fan, in which a dew condensation sensor for detecting humidity is installed in an electric circuit that operates a ventilation fan installed in a bathroom, and the operation of the ventilation fan is controlled depending on whether or not humidity is detected to be higher than a set humidity of the dew condensation sensor. , a detection time difference calculation means for calculating a time difference obtained by subtracting the time during which humidity is not detected at or above the set humidity from the time at which the dew condensation sensor detects humidity at or above the set humidity when the ventilation fan is stopped; and stabilizing the condensation detection state of the dew condensation sensor at this time difference. an operation start means for starting the operation of the ventilation fan by detecting a relatively short predetermined value or more, and an operation time calculation for calculating the ventilation fan operation time according to the detection time of the humidity exceeding a set value of the dew condensation sensor when the ventilation fan is operating. An automatic operation device for a ventilation fan for a bathroom, characterized in that the device comprises: means for stopping operation of the ventilation fan after an operating time calculated by the means has elapsed since the start of operation of the ventilation fan. 5. The automatic operation device for a bathroom ventilation fan according to claim 4, wherein the time measurement by the detection time difference calculation means and the operation time calculation means is performed based on the period of the power supply frequency.