JP4867270B2 - Bath ventilation dryer - Google Patents

Description

  The present invention relates to a bath ventilation drying apparatus using electric heat for heating or ventilating in addition to drying laundry using a so-called sanitary zone such as a bathroom, a dressing room, a washroom, or a toilet.

  In recent years, with the increase in the number of bathrooms installed in general households, bathroom ventilation dryers that have a heating function and a drying function that uses the bathroom to dry laundry have become widespread. ing. Furthermore, the Building Standards Law has been revised, and in newly built houses, it is obliged to install a ventilator with a function of constant ventilation, and the importance of indoor ventilation is being recognized. In particular, a filter that removes dust from circulating air has been installed. The spread of installed bathroom ventilation dryers is expanding.

  Conventionally, there are devices of this type that use hot water as a heat source and devices that use electric heat.

  The one that uses hot water is a water heater installed outdoors that uses gas or kerosene as a heat source, circulates the hot water and warms the indoor air with a heat exchanger, and one that uses electric heat Heating means such as a nichrome wire heater or a halogen heater installed in an apparatus that uses power from a commercial power source is used as a heat source.

  The former uses a relatively low temperature hot water of about 80 ° C., whereas the latter uses a relatively high temperature heating means of 100 ° C. or higher. Therefore, the latter requires heat resistance in the structure of the apparatus. At the same time, the temperature of the inside of the device, that is, the above heating means and the vicinity thereof increases due to the failure of the component parts, particularly the ventilation or the deterioration of the circulation performance due to the clogging of the filter, and the resin constituting the device to prevent the occurrence of fire There is a need to protect components with relatively low heat resistance, such as manufactured casings, filters, and control devices composed of electronic components.

  In addition, since power consumption increases due to ventilation due to clogging of the filter or reduction in ventilation efficiency due to deterioration in circulation performance, it is required to inform the user that it is time to clean or replace the filter.

  Conventionally, this type of bathroom heating device has a detecting means for detecting the number of rotations of a circulation fan or a ventilation fan, and is configured to measure the time from when a fan operation stop command is issued until it stops, so that the filter is clogged. In a certain state, it is known that a filter clogging is detected by taking advantage of a long time until the fan stops (for example, see Patent Document 1).

  Hereinafter, the bathroom heater will be described with reference to FIG.

  As shown in the figure, the circulation fan 101, the circulation fan drive unit 103, the circulation fan rotation number detection unit 104, the ventilation fan 102, the ventilation fan drive unit 106, the ventilation fan rotation number detection unit 107, and the heater drive The circulation fan drive unit 103 is turned off when a predetermined time is reached after the drying operation, and the operation of the circulation fan 101 is stopped. At this time, the circulation fan 101 stops rotating after inertial rotation for a while after the circulation fan drive unit 103 is turned off.

  Compared with the condition where the circulation filter is installed and there is no clogging, the time in which the circulation filter is installed and clogged is longer. Thus, by detecting the number of rotations in a predetermined time, it is possible to detect that the filter is clogged and to display a filter cleaning display.

JP 2002-102596 A

  In such a conventional bathroom heating device, when the rotational speed detection means for detecting the rotational speed of the fan has an internal motor, it is expensive, or when the rotational speed is detected separately from the motor. There is a problem that a dedicated sensor is required and the configuration becomes complicated, and it is required to detect clogging of the filter at a low cost with a simple configuration.

  The present invention solves such a conventional problem, and includes a temperature sensor for detecting the temperature in the bathroom and a temperature sensor for detecting the temperature in the vicinity of the heating means, and the control device is provided in the bathroom. Monitors the transition of the temperature difference between the sensor that detects the temperature of the sensor and the sensor that detects the temperature in the vicinity of the heating means, and detects that the filter is clogged when the temperature difference exceeds a specified value. It is an object of the present invention to provide a bath ventilation drying apparatus that has a simple structure and can be made inexpensive.

  Further, if it is detected that the filter is clogged, it is required to stop the operation and to inform the user quickly in order to prevent a failure due to heat generation inside the apparatus.

  The present invention provides a bath ventilation drying apparatus that can stop the operation of a bus ventilation drying apparatus or notify a user by a light emitter or an alarm sound if it detects that a filter is clogged. The purpose is that.

In order to achieve the above object, the bath ventilation drying apparatus of the present invention is provided with a ventilation fan for ventilating the air in the bathroom, a circulation fan for circulating the air in the bathroom, and dust of the circulation air generated by the circulation fan. In a bath ventilation drying apparatus comprising: a filter to be removed; a heating means for heating circulating air; and a control device for heating or drying the interior of a bathroom by operating the ventilation fan, the circulation fan and the heating means in combination. A first temperature sensor provided upstream of the circulation fan for detecting the temperature in the bathroom and a second temperature sensor for detecting the temperature of the air discharged from the heating means are provided, and the control device is provided with a first temperature. When the detected temperature is increased based on the sensor detection temperature is changed lower specified value of the temperature gradient, the second temperature sensor temperature changes over time of the detected temperature photographies Calculated as one in which the calculation result is a structure which is characterized by detecting that the filter is clogged when above the specified value of the temperature gradient.

  As a result, when the filter is clogged, dust accumulates inside the filter, and circulating air passing through the filter decreases, and air warmed by the heating means stays, thereby detecting the temperature in the vicinity of the heating means. As the detection temperature of the second temperature sensor increases, the control device calculates the time transition of the detection temperature of the second temperature sensor as a temperature gradient, and the calculation result changes based on the detection temperature of the first temperature sensor. Thus, a bath drying device that detects that the filter is clogged when the specified temperature gradient is exceeded is obtained.

  Further, the control device includes a setting unit for setting the operation mode.

  Thereby, the bath ventilation drying apparatus which can set the regulation value of a temperature gradient corresponding to the operation mode of an operation mode setting part is obtained.

Further, the control device is configured to increase the specified value of the temperature gradient as the control value of the heating amount of the heating means increases .

  Thereby, the bath ventilation drying apparatus which can change the regulation value of a temperature gradient according to the control value of the heating amount of a heating means by a control apparatus is obtained.

  In addition, when it is detected that the filter is clogged, the light emitting body displays on the failure display unit.

  Thereby, if it detects that a filter is clogged, the bath ventilation drying apparatus which can be displayed on a failure display part with a light-emitting body will be obtained.

Also, if detecting that the filter is clogged, it is obtained by a configuration in which more notification to the alarm unit by warning sound.

Accordingly, if detecting that the filter is clogged, the bus ventilation drying apparatus that can be more notification to the alarm unit by warning sound is obtained.

According to the present invention, a ventilation fan for ventilating the air in the bathroom, a circulation fan for circulating the air in the bathroom, a filter for removing dust from the circulation air generated by the circulation fan, and heating the circulation air In a bath ventilation drying apparatus including a heating device, a ventilation fan, a control device that heats or dries the bathroom by operating the ventilation fan and the heating device in combination, and provided in the bathroom upstream of the circulation fan. a second temperature sensor for detecting a first air temperature discharged from the temperature sensor and the heating means for detecting a temperature is provided, wherein the control device, the detection temperature based on the temperature detected by the first temperature sensor There is varied lower specified value of the temperature gradient when raised, the time course of the detected temperature of the second temperature sensor is calculated as the temperature gradient, the computation result is the temperature Filter with a simple configuration that detects that a clogging, and can provide a bus drying apparatus can be made inexpensive when above the specified value of the gradient.

  Further, it is possible to provide a bath drying apparatus that can set a specified value of the temperature gradient corresponding to the setting mode of the operation mode setting unit.

In addition, the control device can provide a bath drying device that can increase the specified value of the temperature gradient as the control value of the heating amount of the heating means increases .

  Moreover, if it is detected that the filter is clogged, it is possible to provide a bath drying device that can display on the failure display unit by the light emitter.

  Moreover, if it is detected that the filter is clogged, it is possible to provide a bath drying device that can notify the alarm unit by an alarm sound.

Sectional side view which shows the whole structure of Embodiment 1 and 2 of this invention The block diagram which shows the structure of the electric system of Embodiment 1 and 2 of this invention Diagram showing an example of the operation mode The figure which shows the temperature transition in the rapid heating mode ((a) is the figure which shows the time transition of the temperature which a heater temperature sensor detects, and the time transition of the temperature which an indoor temperature sensor detects, (b) is electricity supply of a heater and a heater Figure showing the situation) The figure for demonstrating the operation principle of the filter clogging detection of Embodiment 1 of this invention ((a) is a time transition of the temperature which a heater temperature sensor detects when the filter is not clogged, and a filter is clogged. (B) is a graph showing the difference between the time transition of the temperature detected by the heater temperature sensor and the temperature detected by the room temperature sensor. (B) shows the temperature detected by the heater temperature sensor and the room temperature sensor when the filter is clogged. The figure which showed time transition, (c) is the figure which shows the time transition of the temperature difference of both sensors at this time) The figure explaining the operation principle of the filter clogging detection of Embodiment 2 of this invention ((a) is a figure which shows the time transition of the temperature of the heater A and the vicinity of the heater B which a heater temperature sensor detects, (b) is temperature Figure showing the result of processing as time change of transition, that is, temperature gradient) The figure explaining the operation principle of the detection when the filter of Embodiment 3 of this invention is not clogged (The figure which shows the time transition of the temperature of the heater A and the vicinity of the heater B which a heater temperature sensor detects) Configuration diagram of a conventional bathroom ventilation dryer

Invention of Claim 1 of this invention is the ventilation fan which ventilates the air in a bathroom, the circulation fan which circulates the air in a bathroom, the filter which removes the dust of the circulation air produced | generated by the said circulation fan, In a bath ventilation drying apparatus comprising heating means for heating circulating air, and a control device for heating or drying the interior of a bathroom by operating the ventilation fan, the circulation fan and the heating means in combination, upstream of the circulation fan A first temperature sensor that detects the temperature in the bathroom and a second temperature sensor that detects the temperature of the air discharged from the heating means, and the control device detects the temperature detected by the first temperature sensor. based When this detected temperature is increased by changing a low predetermined value of the temperature gradient, the time course of the detected temperature of the second temperature sensor is calculated as the temperature gradient, the Starring When the result exceeds the specified value of the temperature gradient, it is detected that the filter is clogged. When the filter is clogged, dust accumulates inside the filter, and the filter As the circulating air passing through the air is reduced, the air heated by the heating means stays, and the detection temperature of the second temperature sensor that detects the temperature in the vicinity of the heating means increases, so that the control device The time transition of the detected temperature of the temperature sensor is calculated as a temperature gradient, and the filter is clogged when the calculation result exceeds the specified value of the temperature gradient changed based on the detected temperature of the first temperature sensor. It has the effect of detecting something.

  In addition, the control device includes a setting unit that sets the operation mode, and has an effect of setting a specified value of the temperature gradient corresponding to the operation mode of the setting unit.

Further, the control device increases the specified value of the temperature gradient as the control value of the heating amount of the heating means increases , and the control device changes the specified value of the temperature gradient according to the control value of the heating amount of the heating device. It has the action.

  Further, if it is detected that the filter is clogged, it has an effect of displaying on the failure display portion by the light emitter.

  Further, if it is detected that the filter is clogged, an alarm sound is given.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the overall configuration of a bath ventilation drying apparatus. In FIG. 1, a partition wall 3 is provided on a casing 2 attached to a ceiling 1, and a circulation fan 5 driven by a circulation motor 4 and a heater A6, a heater B7, and a reflector plate 8 as heating means are provided below the partition wall 3. ing. The grill 9 has an intake port 9 a and a discharge port 9 b and is fixed to the casing 2. The filter 10 is fixed to the intake port 9a of the grill 9 in a detachable state. When the circulation fan 5 is driven during the heating operation or the drying operation, the indoor air is blown from the discharge port 9b through the filter 10, the circulation fan 5, the heater A6, and the heater B7 from the lower intake port 9a. It shows the circulation air path of indoor air.

  On the other hand, a ventilation fan 13 driven by a ventilation motor 12 and an exhaust port 14 are provided above the partition wall 3. The exhaust air passage 15 indicates an air passage through which indoor air when the ventilation fan 13 is driven during the heating operation, the drying operation, or the ventilation operation is drawn from the air inlet 9a and is discharged to the outside through a duct (not shown).

  In the above-mentioned bath ventilation drying apparatus, the indoor temperature sensor 17 for detecting the indoor temperature is provided upstream of the circulation fan 5 in a place where the main part of the control device 16 is isolated as shown in the figure, and the heater temperature sensor 18 is provided. In the vicinity of the heater, that is, the vicinity shown here, in the situation where the circulation fan 5 is driven, the heater temperature sensor 18 only needs to be able to detect the temperature of the air heated and discharged by the heater. It is provided between the outlet 9b and the heaters A6 and B7.

  FIG. 2 is a block diagram showing the configuration of the electrical system of the bus ventilation drying apparatus according to Embodiment 1 of the present invention.

  The control device 16 receives a CPU (central processing unit using a microcomputer) 19 as an input, and sets an operation mode for the user to manually set the above-described indoor temperature sensor 17, heater temperature sensor 18, and operation modes such as heating and drying. Is connected to relays 21, 22, 23, 24 for driving heater A 6, heater B 7, circulation fan 5, and ventilation fan 13, respectively, and a filter clogging display unit such as a liquid crystal display 25 and an alarm unit 26 such as a speaker. The operation mode setting unit 20, the filter clogging display unit 25, and the alarm unit 26 are used as a remote control device 27 (a portion surrounded by a dotted line in the figure) separately from the bath ventilation drying device and attached to the wall surface of the bathroom.

  Although not shown, the load contacts of the relays 21, 22, 23, and 24 are connected to a commercial power source via a leakage breaker.

  Next, a description will be given of the operation mode and the trend of temperature transition during operation taking the rapid heating operation mode as an example with reference to FIGS. 3 and 4.

  FIG. 3 is a diagram illustrating an example of the operation mode.

  The rapid heating operation mode 20a is an operation mode for rapidly heating a bathroom in winter, the heating operation mode 20b is an operation mode that does not require rapid heating, and the drying operation mode 20c is for drying clothes and the like. This is the operation mode.

  It represents that the above-mentioned components marked with a circle in each operation mode are driven.

  For example, in the rapid heating operation mode 20a, the heater A6, the heater B7, and the circulation fan 5 are driven.

  FIG. 4 is a diagram showing the time transition of temperature when operating in the rapid heating operation mode 20a of FIG.

  FIG. 4A shows a time transition 18 a of the temperature detected by the heater temperature sensor 18 and a time transition 17 a of the temperature detected by the room temperature sensor 17.

  In addition, a time transition 18b of the temperature detected by the heater temperature sensor 18 in a state where the filter 10 is clogged is shown.

  FIG. 4B is a diagram illustrating a state of energization of the heater A6 and the heater B7.

  When the filter 10 becomes clogged, dust accumulates inside the filter 10 and the circulating air passing through the filter 10 decreases, so that the air heated by the heaters A6 and B7 stays, and the heater temperature sensor 18 Temperature rises.

  At time t1, the controller 16 turns off the heater A6 at the temperature of the indoor temperature sensor 17, and similarly turns on the heater A6 at time t2. Similarly, after time t3, the controller 16 controls the heater A6 so that the heater A6 is repeatedly turned on and off to keep the room temperature constant.

  Next, the principle of detection of clogging of the filter 10 and the operation of the control device 16 when clogged will be described with reference to FIG.

  FIG. 5 is a diagram for explaining the principle of detecting clogging of the filter 10.

  FIG. 5A shows the time transition 18a of the temperature detected by the heater temperature sensor 18 when the filter 10 of FIG. 4A is not clogged and the temperature detected by the heater temperature sensor 18 when the filter 10 is clogged. This represents the difference between the time transition 18b and the temperature 17a detected by the room temperature sensor 17, and is shown by curves 18c and 18d.

  A curve 18d shows the same temperature difference when operated in the heating operation mode 20b of FIG. 3, and shows that the temperature difference is lower than that of the curve 18c because it is operated only by the heater A6.

  FIG. 5B shows the time transition of the temperature detected by the heater temperature sensor 18 and the room temperature sensor 17 when the filter 10 is clogged, and FIG. 5C shows the time transition of the temperature difference between the two sensors at this time. FIG.

  First, in FIG. 5B, the temperature detected by the indoor temperature sensor 17 at an arbitrary time t4 when the filter 10 is clogged (hereinafter simply referred to as the temperature of the indoor temperature sensor, the same applies to the heater temperature sensor 18) 17b. The temperature of the heater temperature sensor 18 is 18e when the filter 10 is not clogged as indicated by 18f in response to the radiant heat of the heater A6 and the heater B7 and heat transfer. Compared to higher temperatures.

  The transition of each temperature difference is 18e and 18f in FIG.

  In FIG. 5C, S1 is a line indicating a threshold value (specified value), and it can be detected that the filter 10 is clogged at the point (time) P1 where the temperature difference 18f between the two exceeds the threshold value S1.

  In this detection method, clogging of the filter 10 can be detected at any time during operation.

  Here, as a matter of course, the threshold value S1 is set higher than the above-described temperature difference transition 18a (reprinted in FIG. 5A) when the filter 10 is not clogged.

  18c in the figure is a reprint of 18c in FIG. 5 (a), and shows the transition of the temperature difference when the filter 10 is not clogged. In this operation mode, the threshold value S2 is used to determine the filter 10 Detect clogging.

  The situation when the filter 10 is clogged at the time t4 as described above is 18g in the figure.

  Clogging of the filter 10 can be detected at a point (time) P2 at which 18g exceeds the threshold value S2.

  The thresholds S1 and S2 are automatically set in the CPU 19 of the control device 16 in accordance with the operation mode of the bath ventilation drying device set by the operation mode setting unit 20.

  The operation of detecting the clogging of the filter 10 described above will be described again in time series. First, in the operation mode in which the circulation fan 5 is driven, the threshold value (specified value) of the temperature difference is set by the operation mode setting unit 20. Automatically set by After the start of operation, the temperature difference between the heater temperature sensor 18 and the room temperature sensor 17 is always calculated and compared with the threshold value. When clogging of the filter 10 progresses gradually in the above process, the value of the temperature difference increases, and it is determined that the filter 10 is clogged when the threshold value is exceeded.

  Next, the operation of the control device 16 when the aforementioned clogging detection of the filter 10 occurs will be described.

  When the control device 16 detects that the filter 10 is clogged, it outputs an output signal from the CPU 19 to the relays 21, 22, 23, 24, thereby turning off all the relays 21, 22, 23, 24 and bath bathroom ventilation. The operation of the drying apparatus is stopped, the alarm unit 26 sounds an alarm to notify the user, and the filter clogging display unit 25 notifies that the filter 10 is clogged.

  As described above, the clogging detection operation of the filter 10 and the operation of the control device 16 when the clogging of the filter 10 is detected are implemented in the form of a program in which the microcomputer in the CPU 19 and the ROM and RAM work together. The same applies to the description of clogging detection of the filter 10 described below.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Similarly to the first embodiment, detection of clogging of various filters 10 according to the second embodiment will be described using the rapid heating operation mode as an example.

  First, the principle of detection of clogging of the filter 10 and the operation of the control device 16 when it is detected that the filter 10 is clogged will be described with reference to FIG.

  FIG. 6 is a diagram for explaining the principle of operation for detecting clogging of the filter 10.

  FIG. 6A is a diagram showing the time transition of the temperature in the vicinity of the heater A6 and the heater B7 detected by the heater temperature sensor 18, and 18a shown by a dotted line in the figure is a reprint of the curve 18a in FIG. .

  In the figure, 4h shows the temperature transition in the vicinity of the heater detected by the heater temperature sensor 18 when the filter 10 is suddenly clogged at an arbitrary time t6, and 4i is the clogging of the filter 10 at an arbitrary time t7. It shows the temperature transition in the vicinity of the heater when it suddenly occurs.

  These two phenomena actually occur on separate occasions, but are shown on the same figure for convenience of explanation.

  The time t7 is between the times t1 and t2, and as described above, the heater A6 is OFF during this period, and only the heater B7 is ON. Therefore, the upward gradient of 4i is gentler than that of 4h.

  FIG. 6B is a diagram showing the result of processing the temperature transition of FIG. 6A as the time change of the temperature transition, that is, the temperature gradient, in the CPU 19 as described above.

  A dotted line 18d in the figure indicates the temperature gradient of 18a in FIG. 6A. This temperature gradient is high in the initial stage of operation and decreases with time, and changes negatively at time t1 (the heater is turned off). It changes to positive again at (heater is ON).

  A solid line 18j corresponds to 4h, and a solid line 18k corresponds to 4i.

  In this figure, S3 and S4 are temperature gradient threshold values (specified values), S3 is a threshold value when heater A6 is ON, S4 is a threshold value when heater A6 is OFF, heater ON / OFF The CPU 19 managing this automatically switches between S3 and S4.

  In this case, in this embodiment, the heater is turned on and off in two stages. However, when the heater is controlled steplessly, the temperature gradient threshold (in accordance with the control value of the heating amount of the heater (heating means)) ( Specified value) is set.

  The intersection P3 between the temperature gradient 18j and the threshold curve S3 when the filter 10 is suddenly clogged and the intersection P4 between the temperature gradient 18k and the threshold curve S4 are the clogging detection points (time) of the filter 10, respectively. .

  Here, the threshold curves S3 and S4 are curved and have a downward slope, and the temperature gradient 18d during normal operation is a downward slope. Therefore, if the threshold value is fixed at a fixed value, there is a risk of malfunctioning detection. . Therefore, the CPU 19 that monitors the room temperature changes the threshold value according to the room temperature to avoid the malfunction.

  Although not shown, the threshold values S3 and S4 are automatically set according to the operation mode as described in the first embodiment.

  The detection operation when the clogging of the filter 10 described above suddenly occurs will be described again in time series. “First, in the operation mode in which the circulation fan 5 is driven, the threshold value (specified value) of the temperature gradient is set. The temperature is automatically set according to the setting of the operation mode setting unit 20. The temperature gradient of the heater temperature sensor 18 is always measured and calculated after the operation is started, and is compared with the threshold value. Accordingly, the threshold value is corrected, and the threshold value is changed even when the heater is turned OFF or ON.

  In the above process, when the filter 10 is rapidly clogged, the value of the temperature gradient increases, and it is determined that the filter 10 is clogged when the threshold value is exceeded.

  Similar to the description in the first embodiment, such an operation is performed in the form of a program in which the microcomputer in the CPU 19 of the control device 16 and the ROM and RAM work together. The same applies to the operation after detecting that the filter 10 described below is clogged.

  When the clogging of the filter 10 is detected, the control device 16 gives an output signal from the CPU 19 to the relays 21, 22, 23, 24, thereby turning off all the relays 21, 22, 23, 24 and bath ventilation drying. The operation of the apparatus is stopped, an alarm is generated by an alarm unit 26, for example, a buzzer, and a clogging display unit 25 of the filter 10, for example, an LED or liquid crystal is used to indicate that the filter 10 is clogged to the user. Notice.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIG. The same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Similarly to the first embodiment, detection when the filter 10 of the third embodiment is not clogged will be described by taking the rapid heating operation mode 20a as an example.

  First, the principle of detection when the filter 10 is not clogged and the operation of the control device 16 when it is detected that the filter 10 is not clogged will be described with reference to FIG.

  FIG. 7 is a diagram for explaining the operation principle of detection when the filter 10 is not clogged.

  FIG. 7 is a diagram showing the time transition of the temperature in the vicinity of the heater A6 and the heater B7 detected by the heater temperature sensor 18, and 18a shown by a dotted line in the figure is a reprint of the curve 18a in FIG.

  In the figure, reference numeral 18l indicates not the clogging of the filter 10 at an arbitrary time t4 but the temperature transition in the vicinity of the heater detected by the heater temperature sensor 18 when, for example, abnormal heat generation of the heater or the like occurs.

  In this figure, S6 is a threshold value (specified value), which is not clogging of the filter 10, for example, the intersection point P5 between the time transition and the threshold curve S6 when abnormal heating of the heating means occurs is the heater (heating means). This is the detection point (time) when abnormal heat generation occurs.

  Similar to the description in the first embodiment, such an operation is performed in the form of a program in which the microcomputer in the CPU 19 of the control device 16 and the ROM and RAM work together. The same applies to the operation after detecting that the filter 10 described below is not clogged.

  When it is detected that the filter 10 is not clogged, that is, when abnormal heating of the heater (heating means) is detected, the control device 16 outputs an output signal from the CPU 19 to the relays 21, 22, 23, 24. All the relays 21, 22, 23, 24 are turned off to stop the operation of the bath ventilation drying device, and an alarm unit 26, for example, a buzzer alerts the user and notifies the user. The display unit, for example, LED or liquid crystal is used to notify that the filter 10 is not clogged and that the heater is abnormal.

  The bus ventilation drying device of the present invention detects clogging of the filter during operation and operates the device on the safe side, and is highly safe and informs the user that it is time to clean or replace the filter. It can be applied not only to home use but also to business buildings such as hotels and inns, and public facilities such as public halls and meetinghouses.

1 Ceiling 2 Casing 3 Partition 4 Circulation Motor 5 Circulation Fan 6 Heater A
7 Heater B
DESCRIPTION OF SYMBOLS 8 Reflector 9 Grill 9a Intake port 9b Discharge port 10 Filter 11 Circulation air path 12 Motor for ventilation 13 Ventilation fan 14 Exhaust port 15 Exhaust air path 16 Controller 17 Indoor temperature sensor 18 Heater temperature sensor 19 CPU
20 operation mode setting section 20a rapid heating operation mode 20b heating operation mode 20c drying operation mode 21 relay 22 relay 23 relay 24 relay 25 filter clogging display section 26 alarm section 27 remote control device

Claims (5)

A ventilation fan for ventilating the air in the bathroom, a circulation fan for circulating the air in the bathroom, a filter for removing dust from the circulation air generated by the circulation fan, a heating means for heating the circulation air, and the ventilation fan And a ventilating / drying apparatus having a control device for heating or drying the interior of the bathroom by operating in combination with the circulation fan and the heating means, the first is provided upstream of the circulation fan to detect the temperature in the bathroom And a second temperature sensor for detecting the temperature of the air discharged from the heating means, and the control device detects the temperature gradient when the detected temperature rises based on the detected temperature of the first temperature sensor. specified value is changed low, the time course of the detected temperature of the second temperature sensor is calculated as the temperature gradient, the computation result is the specified value of the temperature gradient Bus ventilation drying apparatus characterized by detecting that the filter is clogged when was e. The bath ventilation drying apparatus according to claim 1, wherein the control device includes a setting unit that sets an operation mode, and sets a specified value of a temperature gradient corresponding to the operation mode of the setting unit. 2. The bath ventilation drying apparatus according to claim 1, wherein the control device increases the prescribed value of the temperature gradient as the control value of the heating amount of the heating means increases . 4. The bath ventilation drying apparatus according to claim 1, wherein when the filter is detected to be clogged, the filter is displayed on the failure display unit by a light emitter. If detecting that the filter is clogged, the bus ventilation drying apparatus according to any one of claims 1, 2, 3, 4, characterized in that more alarm to the alarm unit.

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