JP2021156469A - Bathroom heating dryer - Google Patents

Abstract

To provide a bathroom heating dryer capable of detecting abnormality of a filter due to clogging separately from the abnormality of a heat exchanger due to clogging.SOLUTION: The bathroom heating dryer comprises: a heat exchanger where a heat medium heated with a heat source machine flows therein; a filter which is installed at an air inlet of a bathroom; a circulation fan which has a fan motor and circulates air heated through the heat exchanger in the bathroom; a first temperature sensor which is installed on the heat exchanger at a side of a heat medium inlet and detects a temperature of the heat medium; a second temperature sensor which is installed on the heat exchanger at a side of a heat medium outlet and detects the temperature of the heat medium; and a control section which determines abnormality of the filter due to clogging thereof and abnormality of the heat exchanger due to clogging thereof. The control section individually determines the abnormality of the filter and the abnormality of the heat exchanger on the basis of a temperature difference between a first temperature detected through the first temperature sensor and a second temperature detected through the second temperature sensor and a current value A or a power value of the fan motor.SELECTED DRAWING: Figure 3

Description

The present invention relates to a bathroom heater / dryer.

A bathroom heater / dryer in which a circulation fan, a ventilation fan, and a heater / dryer main body equipped with a heat exchanger are embedded in a ceiling wall or the like of a bathroom is known. This type of bathroom heater / dryer has a cool breeze operation for cooling the inside of the bathroom, a heating operation for heating the inside of the bathroom, a ventilation operation for exhausting the air in the bathroom to the outside, and further in the bathroom. It has multiple operation modes, such as a drying operation for drying the laundry.

In the bathroom heater / dryer as described above, a filter is attached to the intake port in order to remove dust in the air when the bathroom air is sucked into the main body of the bathroom heater / dryer. In this case, as the operation time elapses, the filter becomes clogged and the circulation performance or the ventilation performance deteriorates. In the bathroom heater / dryer described in Patent Document 1, when the difference between the initial operating current value and the operating current value becomes higher than a predetermined threshold value, it is determined that the filter is clogged, and the filter is determined based on the determination. Notify that cleaning is required.

Japanese Unexamined Patent Publication No. 2013-164191

In a bathroom heater / dryer, in addition to a filter, a heat exchanger that heats air by exchanging heat between a heat medium and air may also be clogged due to the adhesion of dust or dirt. When the heat exchanger is clogged, the air volume of the air for heat exchange becomes small, so that the heat exchange efficiency decreases. Therefore, the bathroom heater / dryer cannot efficiently use the heating function. The clogging of the filter can be detected visually or by using the technique described in Patent Document 1. On the other hand, clogging of the heat exchanger is difficult to visually recognize because it is built in the bathroom heater / dryer, and it is difficult to distinguish it from clogging of the filter.

In view of the above circumstances, there is a demand for a bathroom heater / dryer that can distinguish between a filter abnormality due to clogging and a heat exchanger abnormality.

The characteristic configuration of the bathroom heater / dryer according to the present invention is
A heat exchanger through which a heat medium heated by the heat of a heat source machine flows,
A filter attached to the air intake in the bathroom,
A circulation fan having a fan motor and heating the air sucked through the suction port by the heat exchanger to circulate it in the bathroom.
A first temperature sensor provided on the heat medium inlet side of the heat exchanger to detect the temperature of the heat medium, and
A second temperature sensor provided on the heat medium outlet side of the heat exchanger to detect the temperature of the heat medium, and
A control unit for determining a filter abnormality due to clogging of the filter and a heat exchanger abnormality due to clogging of the heat exchanger is provided.
The control unit is based on the temperature difference between the first temperature detected by the first temperature sensor and the second temperature detected by the second temperature sensor, and the current value or power value of the fan motor. The point is that the filter abnormality and the heat exchanger abnormality are individually determined.

According to this feature configuration, it is based on the temperature difference between the first temperature of the heat medium on the heat medium inlet side of the heat exchanger and the second temperature of the heat medium on the heat medium outlet side, and the current value or power value of the fan motor. Therefore, the filter abnormality due to the clogging of the filter and the heat exchanger abnormality due to the clogging of the heat exchanger can be easily distinguished and detected. The clogging of the filter can be dealt with by, for example, the user replacing or cleaning the filter. On the other hand, since it is difficult for the user to deal with the clogging of the heat exchanger, it is necessary to take measures such as requesting a contractor. Therefore, since the filter abnormality and the heat exchanger abnormality can be detected individually, it is possible to smoothly take measures according to the clogged portion.

Further characteristic configurations of the bathroom heater / dryer according to the present invention are:
The circulation fan is configured to perform feedback control that controls the rotation speed so that the flow rate of air becomes a predetermined flow rate.
In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is set to a preset second. When it is equal to or more than the threshold value, it is determined that the filter is abnormal, the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor. Is lower than the second threshold value, it is determined that the heat exchanger is abnormal.

If the filter and the heat exchanger are clogged during the operation of the bathroom heater / dryer, the air flow will be impaired, and the heat exchange efficiency of the heat exchanger will be impaired. Therefore, the temperature difference between the first temperature, which is the heat medium temperature on the heat medium inlet side of the heat exchanger, and the second temperature, which is the heat medium temperature on the heat medium outlet side of the heat exchanger, is equal to or less than a predetermined first threshold value. Become. Therefore, when the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, it can be determined that there is an abnormality in either the filter or the heat exchanger.

In addition, since the filter has a fine mesh, if the filter is clogged, the amount of intake air from the filter is greatly reduced. Here, in the feedback-controlled circulation fan, the rotation speed of the circulation fan is controlled to be increased in order to set the reduced intake amount to the target intake amount. Therefore, when the filter is clogged, the current value or the power value of the fan motor increases. On the other hand, the heat exchanger exchanges heat using, for example, a fin tube, and the fins of the fin tube have a coarser mesh than the filter. Therefore, even if the heat exchanger is clogged, the influence on the rotation speed of the circulating fan is small, and the fluctuation of the current value or the power value of the fan motor is small.

Therefore, in this configuration, in the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor is preset. When it is equal to or higher than the second threshold value, it is determined that the filter is abnormal, the temperature difference between the first temperature and the second temperature is equal to or lower than the preset first threshold value, and the current value or power value of the fan motor is the first. If it is lower than the two thresholds, it is determined that the heat exchanger is abnormal. As a result, when the circulation fan is feedback-controlled, it is possible to reliably distinguish and detect the filter abnormality and the heat exchanger abnormality.

Further characteristic configurations of the bathroom heater / dryer according to the present invention are:
In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is lower than the second threshold value. When the state continues for a predetermined time, it is determined that the heat exchanger is abnormal.

If the current value or power value of the fan motor is lower than the second threshold value, there is a high possibility that the heat exchanger is abnormal. However, since the filter has a finer mesh than the heat exchanger, clogging is more likely to occur than the heat exchanger. Therefore, the filter may be clogged after a short time, and the current value or the power value of the fan motor may become equal to or higher than the second threshold value. Therefore, in this configuration, in the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor is greater than the second threshold value. If the low temperature continues for a predetermined time, it is determined that the heat exchanger is abnormal. As a result, when the circulation fan is feedback-controlled, it is possible to more reliably distinguish and detect the filter abnormality and the heat exchanger abnormality.

Further characteristic configurations of the bathroom heater / dryer according to the present invention are:
The circulation fan is configured to perform control to operate at a predetermined rotation speed.
In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is set to a preset third. When it is equal to or less than the threshold value, it is determined that the filter is abnormal, and the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor. Is higher than the third threshold value, it is determined that the heat exchanger is abnormal.

If the filter and the heat exchanger are clogged during the operation of the bathroom heater / dryer, the air flow will be impaired, and the heat exchange efficiency of the heat exchanger will be impaired. Therefore, the temperature difference between the first temperature, which is the heat medium temperature on the heat medium inlet side of the heat exchanger, and the second temperature, which is the heat medium temperature on the heat medium outlet side of the heat exchanger, is equal to or less than a predetermined first threshold value. Become. Therefore, when the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, it can be determined that there is an abnormality in either the filter or the heat exchanger.

In addition, when the circulation fan is controlled to operate at a predetermined rotation speed, if an abnormality occurs due to clogging of the filter, the intake amount is significantly reduced due to the fine mesh, and the circulation is accompanied by the abnormality. The workload of the fans is reduced. Therefore, when the filter is clogged, the current value or the power value of the fan motor decreases. On the other hand, even if the heat exchanger is clogged, the influence on the rotation speed of the circulating fan is small, and the fluctuation of the current value or the power value of the fan motor is small.

Therefore, in this configuration, in the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor is preset. When it is equal to or less than the third threshold value, it is determined that the filter is abnormal, and when the current value or the power value of the fan motor is higher than the third threshold value for a predetermined time, it is determined that the heat exchanger is abnormal. As a result, when the control that the circulation fan operates at a predetermined rotation speed is executed, the filter abnormality and the heat exchanger abnormality can be reliably distinguished and detected.

Further characteristic configurations of the bathroom heater / dryer according to the present invention are:
In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is higher than the third threshold value. When the state continues for a predetermined time, it is determined that the heat exchanger is abnormal.

If the current value or power value of the fan motor is higher than the third threshold value, there is a high possibility that the heat exchanger is abnormal. However, since the filter has a finer mesh than the heat exchanger, clogging is more likely to occur than the heat exchanger. Therefore, the filter may be clogged after a short time, and the current value or the power value of the fan motor may become equal to or less than the third threshold value. Therefore, in this configuration, in the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor is greater than the third threshold value. If the high temperature continues for a predetermined time, it is determined that the heat exchanger is abnormal. As a result, when the circulation fan is feedback-controlled, it is possible to more reliably distinguish and detect the filter abnormality and the heat exchanger abnormality.

Further characteristic configurations of the bathroom heater / dryer according to the present invention are:
The point is that the control unit further includes a notification unit that notifies the determination result of the control unit when the control unit determines the filter abnormality or the heat exchanger abnormality.

According to this feature configuration, it is possible to reliably recognize a filter abnormality and a heat exchanger abnormality due to clogging based on the determination result notified by the notification unit, and it is possible to smoothly take measures according to the abnormality location.

Further characteristic configurations of the bathroom heater / dryer according to the present invention are:
The circulation fan is located on the downstream side of the filter and the heat exchanger.

According to this feature configuration, the air sucked from the bathroom through the filter from the suction port by the circulation fan passes near the heat exchanger and is heated. As a result, the circulation fan can properly circulate the air heated by the heat exchanger in the bathroom.

It is a figure which shows the schematic structure of the bathroom heater / dryer of this embodiment. It is sectional drawing of the apparatus main body of a bathroom heater / dryer. It is a flowchart which determines a filter abnormality and a heat exchanger abnormality when a circulation fan is feedback controlled. It is a flowchart which determines a filter abnormality and a heat exchanger abnormality when the control which operates a circulation fan at a predetermined rotation speed is executed.

Hereinafter, embodiments of the bathroom heater / dryer according to the present invention will be described with reference to the drawings.

[First Embodiment]
As shown in FIGS. 1 and 2, the bathroom heater / dryer 100 controls the operation of the apparatus main body M, the heat source machine G that circulates and supplies the heated heat medium to the apparatus main body M, and the bathroom heater / dryer 100. It is configured to include an operation control unit C as a unit, a bathroom remote controller R1 for instructing various control commands to the operation control unit C, and a dressing room remote controller R2. The bathroom remote controller R1 (an example of the notification unit) is provided in the bathroom B, and the dressing room remote controller R2 (an example of the notification unit) is provided in the dressing room adjacent to the bathroom B.

The apparatus main body M is composed of a main body casing 1 (an example of the main body) and a grill plate 2 provided below the main body casing 1. The main body casing 1 is arranged behind the ceiling of the bathroom B, and the grill plate 2 is arranged on the ceiling surface of the ceiling plate 10 on the bathroom side. The device main body M is suspended and supported by a hanging metal fitting 11 on a ceiling slab or the like. Further, the exhaust duct 5 connected to the duct connecting portion E (exhaust air guide box 14) is constructed so as to crawl behind the ceiling of the bathroom B so that the tip of the exhaust duct 5 faces the outside from an outer wall or the like.

The main body casing 1 is formed in a box shape having a substantially rectangular parallelepiped shape in which the lower part is opened substantially entirely. A circulation fan 6, an exhaust fan 7, a heat exchanger 9, and the like are provided in the main body casing 1. The circulation fan 6 acts to ventilate the air sucked from the suction port 3 so as to blow it out from the air outlet 4. The exhaust fan 7 discharges the air sucked from the suction port 3 to the outside of the main body casing 1. The heat exchanger 9 heats the air ventilated by the circulation fan 6 with a heat medium circulated and supplied from the heat source machine G through the heat medium circulation path 8.

The grill plate 2 is provided with an air suction port 3 and an air outlet 4 formed in a state of closing the opening below the main body casing 1. A filter 20 is detachably provided on the suction port 3. Further, the suction port 3 is provided with suction port fins 3c formed in a grid pattern.

As shown in FIG. 2, a circulation ventilation passage 18 for sucking the air in the bathroom B through the suction port 3 and blowing it out through the air outlet 4 is provided inside the main body casing 1 through the suction port 3 as indicated by the hollow arrow. It is partitioned by. The circulation ventilation passage 18 is partitioned by a baffle plate 16 from a space portion in the main body casing 1 facing the exhaust port 13. A circulation fan 6 is provided in the circulation ventilation passage 18 so as to suck the air into the suction port 3 and discharge the air sucked from the suction port 3 toward the air outlet 4. The circulation fan 6 has a fan motor 6a as a drive source. Further, the current value A of the fan motor 6a is configured to be output to the operation control unit C.

The heat exchanger 9 is provided in the circulation ventilation passage 18 on the upstream side in the ventilation direction with respect to the circulation fan 6, and circulates ventilation by heat exchange with the heat medium circulated and supplied from the heat source machine G through the heat medium circulation passage 8. It is configured to heat the air passing through the passage 18. Incidentally, the heat exchanger 9 is composed of a pair of heat exchanger portions, and these pair of heat exchange portions are arranged in an L shape in a front view. That is, due to the ventilation action of the circulation fan 6, the air in the bathroom B sucked through the suction port 3 and the filter 20 is heated by the heat exchanger 9 and then blown out into the bathroom B through the air outlet 4. As a result, the heating operation and the drying operation in which the inside of the bathroom B is heated are performed. The bathroom heating operation is carried out by a command from the bathroom remote controller R1 and the dressing room remote controller R2.

The heat medium circulation path 8 is provided with a first temperature sensor 21 and a second temperature sensor 22. The first temperature sensor 21 is provided on the heat medium inlet side of the heat exchanger 9 and detects the inlet temperature (first temperature T1) of the heat medium flowing through the heat medium circulation path 8. The second temperature sensor 22 is provided on the heat medium outlet side of the heat exchanger 9 and detects the outlet temperature (second temperature T2) of the heat medium flowing through the heat medium circulation path 8. The first temperature T1 and the second temperature T2 are configured to be output to the operation control unit C.

Further, the air outlet 4 is provided with a movable louver 19 which is oscillated by an electric motor (not shown), and the movable louver 19 can change the wind direction of the air blown from the air outlet 4 into the bathroom B. It is configured as follows.

The exhaust fan 7 is provided in the fan case 7a provided in the portion between the inner side surface on which the exhaust port 13 is formed and the baffle plate 16 inside the main body casing 1. Further, an electric motor 7b that rotationally drives the exhaust fan 7 is arranged on the upper surface of the fan case 7a. Further, although not shown, the space portion in which the exhaust fan 7 is arranged between the inner side surface on which the exhaust port 13 is formed and the baffle plate 16 is larger than the heat exchanger 9 in the circulation ventilation passage 18. It is configured to communicate with the part on the downstream side in the ventilation direction.

The bathroom heater / dryer 100 has a ventilation operation mode and a cool breeze operation mode in addition to the heating operation mode and the drying operation mode as operation modes, and the amount of air blown can be changed in each operation mode. .. In the ventilation operation, a part of the air in the bathroom B is discharged to the outside by operating the exhaust fan 7 while operating the circulation fan 6 during the heating operation or the drying operation, or the exhaust fan 7 is in a state where the circulation fan 6 is stopped. Is operated to exhaust the air in the bathroom B. In the cool breeze operation, the circulation fan 6 is operated in a state where the air is not heated by the heat exchanger 9, and the exhaust fan 7 is operated while supplying the cool breeze into the bathroom B to ventilate the air in the bathroom B. The remote controllers R1 and R2 can set operating conditions such as each operating mode, target temperature, and operating time.

As the period of use of the bathroom heater / dryer 100 shown in FIGS. 1 and 2 becomes longer, dust or dirt adheres to the fins (not shown) of the filter 20 and the heat exchanger 9, and the filter 20 and the heat exchanger 9 become dusty. Clogs may occur. When the filter 20 or the heat exchanger 9 is clogged, the ventilation resistance increases and the ventilation of air is suppressed, so that the heat exchange efficiency decreases.

Here, the circulation fan 6 is configured to execute feedback control for controlling the rotation speed so that the flow rate of air becomes a predetermined flow rate. Therefore, when the filter 20 or the heat exchanger 9 is clogged, the circulation fan 6 increases the current value of the fan motor 6a in order to maintain a predetermined flow rate.

The bathroom heater / dryer 100 is configured in the operation control unit C to determine a filter abnormality due to clogging of the filter 20 and a heat exchanger abnormality due to clogging of the heat exchanger 9. The determination control by the operation control unit C will be described with reference to FIG. This determination control is performed at the time of executing the heating operation and the drying operation in which heat exchange is performed in the heat exchanger 9.

The operation control unit C performs the determination operation of the flowchart shown in FIG. In step # 1, a heating operation or a drying operation is started. At this time, the circulation fan 6 is rotationally driven, and the heat medium is circulated and supplied from the heat source machine G through the heat medium circulation path 8. Further, the air heated by the heat exchanger 9 is supplied into the bathroom B by the circulation fan 6. In step # 2, the temperature difference ΔT between the first temperature T1 before the introduction of the heat medium circulation path 8 into the heat exchanger 9 and the second temperature T2 after the introduction, and the preset threshold value α1 (of the first threshold value). Example) is compared. When the temperature difference ΔT is larger than the threshold value α1 (step # 2, Yes), heat exchange is properly performed in the heat exchanger 9, so that normal determination is made in step # 4 and the heating operation or the drying operation is continued. Will be done.

When the temperature difference ΔT is equal to or less than the threshold value α1 (steps # 2 and No), heat exchange is not properly performed in the heat exchanger 9, and therefore, in step # 3, the current value A of the fan motor 6a of the circulation fan 6 Is compared with the preset threshold value α2 (an example of the second threshold value). When the current value A is equal to or higher than the threshold value α2 (step # 3, Yes), it is determined in step # 5 that the filter is abnormal due to clogging of the filter 20, and in step # 6, an error is displayed on the remote controllers R1 and R2 (the determination result). Display) is executed.

When the current value A is less than the threshold value α2 in step # 3 (step # 3, No), the current value A may become the threshold value α2 or more over time. Therefore, in step # 7, the predetermined time t1 (for example, 5) Minutes) After the lapse, the current value A and the threshold value α2 are compared again. When the current value A is equal to or higher than the threshold value α2 (steps # 7, Yes), it is determined that the filter is abnormal in step # 5, and error display (display of the determination result) is executed on the remote controllers R1 and R2 in step # 6. .. When the current value A is less than the threshold value α2 (steps # 7, No), the current value A and the threshold value α2 are compared again after a predetermined time t2 (for example, 5 minutes) has elapsed in step # 8. The predetermined time t1 and the predetermined time t2 may be different times.

When the current value A is equal to or higher than the threshold value α2 (step # 8, Yes), it is determined that the filter is abnormal in step # 5, and error display is executed on the remote controllers R1 and R2 in step # 6. When the current value A is less than the threshold value α2 (steps # 8 and No), it is determined that the heat exchanger is abnormal in step # 9, and the error display (display of the determination result) on the remote controllers R1 and R2 is displayed in step # 10. Run.

The above-mentioned filter abnormality and heat exchanger abnormality determination control is performed until the heating operation or the drying operation is completed (step # 11).

When feedback control is executed in which the circulation fan 6 controls the rotation speed so that the flow rate of air becomes a predetermined flow rate by the above-mentioned determination control by the operation control unit C, a filter abnormality and heat exchange due to clogging of the filter 20 are executed. It is possible to reliably distinguish and detect a heat exchanger abnormality due to clogging of the vessel 9. The clogging of the filter 20 can be dealt with by, for example, the user replacing or cleaning the filter 20. On the other hand, since it is difficult for the user to deal with the clogging of the heat exchanger 9, it is necessary to take measures such as asking a contractor, for example. Therefore, since the filter abnormality and the heat exchanger abnormality can be detected individually, it is possible to smoothly take measures according to the clogged portion.

[Second Embodiment]
In the first embodiment described above, the circulation fan 6 is configured to execute feedback control for controlling the rotation speed so that the flow rate of air becomes a predetermined flow rate. In the present embodiment, the circulation fan 6 is configured so that the control for operating at a predetermined rotation speed is executed without executing the above feedback control. In this case, if the filter 20 is clogged, the circulation fan 6 receives ventilation resistance and the rotation speed decreases, and the current value A of the fan motor 6a also decreases. Therefore, the determination control by the operation control unit C is partially different from the above embodiment.

The operation control unit C performs the determination operation of the flowchart shown in FIG. In step # 21, a heating operation or a drying operation is started. At this time, the circulation fan 6 is rotationally driven, and the heat medium is circulated and supplied from the heat source machine G through the heat medium circulation path 8. Further, the air heated by the heat exchanger 9 is supplied into the bathroom B by the circulation fan 6. In step # 22, the temperature difference ΔT between the first temperature T1 before the introduction into the heat exchanger 9 of the heat medium circulation path 8 and the second temperature T2 after the introduction is compared with the preset threshold value α1. .. When the temperature difference ΔT is larger than the threshold value α1 (step # 22, Yes), heat exchange is properly performed in the heat exchanger 9, so that normal determination is made in step # 24 and the heating operation or the drying operation is continued. Will be done.

When the temperature difference ΔT is equal to or less than the threshold value α1 (steps # 22, No), heat exchange is not properly performed in the heat exchanger 9, and therefore, in step # 23, the current value A of the fan motor 6a of the circulation fan 6 Is compared with the preset threshold value α3 (an example of the third threshold value). When the current value A is equal to or less than the threshold value α3 (steps # 23, Yes), it is determined that the filter is abnormal in step # 25, and error display (display of the determination result) is executed on the remote controllers R1 and R2 in step # 26. ..

When the current value A exceeds the threshold value α3 in step # 23 (steps # 23, No), the current value A may become less than or equal to the threshold value α3 over time. Therefore, in step # 27, the predetermined time t1 (for example, 5) Minutes) After the lapse, the current value A and the threshold value α3 are compared again. When the current value A is equal to or less than the threshold value α3 (step # 27, Yes), it is determined that the filter is abnormal in step # 25, and error display (display of the determination result) is executed on the remote controllers R1 and R2 in step # 26. .. When the current value A exceeds the threshold value α3 (steps # 27, No), the current value A and the threshold value α3 are compared again after a predetermined time t2 (for example, 5 minutes) has elapsed in step # 28. The predetermined time t1 and the predetermined time t2 may be different times.

When the current value A is equal to or less than the threshold value α3 (step # 28, Yes), it is determined that the filter is abnormal in step # 25, and error display (display of the determination result) is executed on the remote controllers R1 and R2 in step # 26. .. When the current value A exceeds the threshold value α3 (steps # 28, No), it is determined that the heat exchanger is abnormal in step # 29, and the error display (display of the determination result) on the remote controllers R1 and R2 is displayed in step # 30. Run.

The above-mentioned filter abnormality and heat exchanger abnormality determination control is performed until the heating operation or the drying operation is completed (step # 31).

When the circulation fan 6 is controlled to operate at a predetermined rotation speed by the above determination control by the operation control unit C, a filter abnormality due to clogging of the filter 20 and a heat exchanger abnormality due to clogging of the heat exchanger 9 are executed. Can be reliably distinguished and detected.

[Another Embodiment]
(1) In the first embodiment described above, the operation control unit C presets a temperature difference ΔT between the inlet temperature of the heat medium (first temperature T1) and the outlet temperature of the heat medium (second temperature T2). An example is shown in which a heat exchanger abnormality is determined when the temperature is equal to or less than the threshold value α1 and the current value A of the fan motor 6a is lower than the threshold temperature α2 for a predetermined time. Instead, in the operation control unit C, the temperature difference ΔT between the first temperature T1 and the second temperature T2 is equal to or less than the preset threshold value α1, and the current value A of the fan motor 6a is from the threshold value α2. If it is also low, it may be immediately determined that the heat exchanger is abnormal.

(2) In the second embodiment described above, the operation control unit C presets a temperature difference ΔT between the inlet temperature of the heat medium (first temperature T1) and the outlet temperature of the heat medium (second temperature T2). An example is shown in which a heat exchanger abnormality is determined when the temperature is equal to or less than the threshold value α1 and the current value A of the fan motor 6a is higher than the threshold temperature α3 for a predetermined time. Instead, in the operation control unit C, the temperature difference ΔT between the first temperature T1 and the second temperature T2 is equal to or less than the preset threshold value α1, and the current value A of the fan motor 6a is from the threshold value α3. If the temperature is high, it may be immediately determined that the heat exchanger is abnormal.

(3) In the above embodiment, an example in which a filter abnormality and a heat exchanger abnormality are determined based on the current value A of the fan motor 6a has been described, but the present invention is not limited to this. That is, the operation control unit C may determine the filter abnormality and the heat exchanger abnormality based on the power value of the fan motor 6a. This is because the voltage applied to the fan motor 6a is often substantially constant, and the current value (effective value) and the power value are in a proportional relationship.

(4) In the above embodiment, an example of the configuration in which the input is input to the operation control unit C via the bathroom remote controller R1 and the dressing room remote controller R2 is shown, but the heat source machine G and the kitchen remote controller provided in the kitchen (not shown). It may be configured to input to the operation control unit C via. The determination result of the operation control unit C may be notified to a mobile terminal such as a smartphone in addition to the remote controllers R1 and R2.

The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

The present invention can be widely used in various bathroom heaters and dryers equipped with filters and heat exchangers.

3: Suction port 4: Air outlet 6: Circulation fan 6a: Fan motor 8: Heat medium circulation path 9: Heat exchanger 18: Circulation ventilation path 20: Filter 21: First temperature sensor 22: Second temperature sensor 100: Bathroom Heating / drying machine A: Current value B: Bathroom C: Operation control unit E: Duct connection part G: Heat source machine M: Device body R1: Bathroom remote control R2: Dressing room remote control T1: Inlet temperature (first temperature)
T2: Outlet temperature (second temperature)
t1, t2: Predetermined time ΔT: Temperature difference α1: Threshold value (first threshold value)
α2: Threshold (second threshold)
α3: Threshold (third threshold)

Claims (7)

A heat exchanger through which a heat medium heated by the heat of a heat source machine flows,
A filter attached to the air intake in the bathroom,
A circulation fan having a fan motor and heating the air sucked through the suction port by the heat exchanger to circulate it in the bathroom.
A first temperature sensor provided on the heat medium inlet side of the heat exchanger to detect the temperature of the heat medium, and
A second temperature sensor provided on the heat medium outlet side of the heat exchanger to detect the temperature of the heat medium, and
A control unit for determining a filter abnormality due to clogging of the filter and a heat exchanger abnormality due to clogging of the heat exchanger is provided.
The control unit is based on the temperature difference between the first temperature detected by the first temperature sensor and the second temperature detected by the second temperature sensor, and the current value or power value of the fan motor. A bathroom heater / dryer that individually determines the filter abnormality and the heat exchanger abnormality. The circulation fan is configured to perform feedback control that controls the rotation speed so that the flow rate of air becomes a predetermined flow rate.
In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is set to a preset second. When it is equal to or more than the threshold value, it is determined that the filter is abnormal, the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor. The bathroom heater / dryer according to claim 1, wherein when the temperature is lower than the second threshold value, the temperature exchanger is determined to be abnormal. In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is lower than the second threshold value. The bathroom heater / dryer according to claim 2, wherein the heat exchanger is determined to be abnormal when the state continues for a predetermined time. The circulation fan is configured to perform control to operate at a predetermined rotation speed.
In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is set to a preset third. When it is equal to or less than the threshold value, it is determined that the filter is abnormal, and the temperature difference between the first temperature and the second temperature is equal to or less than the preset first threshold value, and the current value or power value of the fan motor. The bathroom heater / dryer according to claim 1, wherein when the temperature is higher than the third threshold value, the temperature exchanger is determined to be abnormal. In the control unit, the temperature difference between the first temperature and the second temperature is equal to or less than a preset first threshold value, and the current value or power value of the fan motor is higher than the third threshold value. The bathroom heater / dryer according to claim 4, wherein the heat exchanger is determined to be abnormal when the state continues for a predetermined time. The bathroom heater / dryer according to any one of claims 1 to 5, further comprising a notification unit that notifies the determination result of the control unit when the control unit determines that the filter is abnormal or the heat exchanger is abnormal. .. The bathroom heater / dryer according to any one of claims 1 to 6, wherein the circulation fan is arranged on the downstream side of the filter and the heat exchanger.

Images