JP7270568B2 - Bathroom dryer and its control method - Google Patents

Description

The present disclosure relates to a bathroom dryer and its control method.

In 2003, the Building Standards Law was amended as a countermeasure against sick-house syndrome as the airtightness of houses became higher, and installation of ventilation equipment capable of 24-hour ventilation was made obligatory. As a result, the demand for bathroom dryers equipped with a 24-hour ventilation function is increasing. As such a bathroom dryer, there is known a bathroom dryer equipped with a multi-room ventilation function capable of drying, heating, and ventilating the bathroom, as well as ventilating other rooms other than the bathroom, such as the dressing room and the toilet. It is

For example, Patent Document 1 describes a ventilation fan that exhausts air from the bathroom and other rooms, a circulation fan that sucks in the air in the bathroom and blows it back into the bathroom, and a ventilation fan and a circulation fan that control the operation. A bathroom dryer is disclosed that includes a controller. In this bathroom dryer, the drying operation can be performed by driving both the ventilation fan and the circulation fan. Further, when the controller detects an abnormal rotation of the circulation fan during the drying operation, the controller stops the circulation fan and continues driving the ventilation fan. Therefore, even if an abnormality occurs in the circulation fan, it is possible to continue exhausting the air from the bathroom and other rooms, and it is possible to meet the ventilation function required for the building.

JP 2016-174744 A (paragraph 0008-0009)

Under the general use environment of the bathroom dryer, the ventilation fan (ventilation fan) has a longer driving time than the circulation fan (circulation fan). For this reason, ventilation fans tend to be more prone to malfunctions due to aged deterioration than circulation fans. However, the bathroom dryer described in Patent Document 1 has a problem that the ventilation function cannot be maintained because both the ventilation fan and the circulation fan stop when an abnormality occurs in the ventilation fan.

The present disclosure has been made to solve the above problems, and provides a bathroom dryer capable of continuing ventilation even when an abnormality in a ventilation fan is detected.

The bathroom dryer according to the present disclosure includes a bathroom air inlet for sucking air from the bathroom, a bathroom air outlet for blowing the sucked air into the bathroom, and a ventilation inlet for sucking air from other rooms other than the bathroom. , an exhaust port for discharging the sucked air to the outside, a circulation air passage from the bathroom air intake to the bathroom air outlet, a ventilation connection port communicating with the circulation air passage to the exhaust port, and a ventilation suction port. a main body provided with a communicating ventilation air passage; a circulation fan arranged in the circulation air passage to suck air from the bathroom suction port and send it to at least one of the bathroom air outlet and the ventilation connection port; A ventilation blower arranged to suck air from the ventilation connection and the ventilation suction port and send it to the exhaust port; an air passage switching means for switching between a second state in which the ventilation connection port is closed and the downstream side of the circulation air passage is open; In preparation, the control unit determines whether or not an abnormality of the ventilation fan and whether or not an abnormality of the circulation fan is detected, and if an abnormality of the ventilation fan and an abnormality of the circulation fan is not detected, In addition, when there is an instruction to drive the ventilation fan to discharge air from the bathroom and other rooms to the outside, the ventilation fan is stopped and the circulation fan is driven in the first state. The control unit detects an abnormality in the ventilation fan and does not detect an abnormality in the circulation fan, and if there is an instruction to operate the ventilation, the rotation of the circulation fan that is driven when an error is not detected in both the ventilation fan and the circulation fan. The circulation fan is driven at a rotation speed equal to or higher than the largest rotation speed among the numbers.

Further, the bathroom dryer control method according to the present disclosure includes a bathroom air inlet for sucking air from the bathroom, a bathroom air outlet for blowing the sucked air into the bathroom, and air from other rooms other than the bathroom. a ventilation inlet for ventilation, an outlet for discharging the sucked air to the outside, a circulating air path from the bathroom inlet to the bathroom outlet, and a ventilation connection port that communicates with the circulating air path to the exhaust port. , a ventilation air passage communicating with the ventilation inlet, and a circulation fan arranged in the circulation air passage to suck air from the bathroom suction port and send it to at least one of the bathroom outlet and the ventilation connection port. , a ventilation blower that is placed in the ventilation air passage, sucks air from the ventilation connection port and the ventilation suction port and sends it to the exhaust port, and the ventilation connection port that is open and the downstream side that reaches the bathroom outlet of the circulation air passage is closed Air passage switching means for switching between the state 1 and the second state in which the ventilation connection port is closed and the downstream side of the circulation air passage is opened, and the operations of the circulation fan, the ventilation fan, and the air passage switching means are controlled. A control method for a bathroom dryer comprising: a step of determining whether the control unit has detected an abnormality in the ventilation fan; and a step of determining whether the control unit has detected an abnormality in the circulation fan. a step of determining whether or not there is an instruction for ventilation operation in which the control unit drives the ventilation fan to exhaust the air in the bathroom and other rooms to the outside; is detected and no abnormality of the circulation fan is detected and there is an instruction for ventilation operation, the ventilation fan is stopped, the air path switching means is switched to the first state, and both the ventilation fan and the circulation fan and a step of driving the circulation fan at a rotation speed equal to or higher than the highest rotation speed among the rotation speeds of the circulation fans that are driven when no abnormality is detected.

According to the present disclosure, if there is an instruction for ventilation operation when an abnormality of the ventilation fan is detected, it is possible to continue ventilation by driving only the circulation fan.

1 is a schematic diagram showing a usage pattern of a bathroom dryer showing Embodiment 1. FIG. 1 is a schematic cross-sectional view of a bathroom dryer showing Embodiment 1. FIG. 1 is a top view of a bathroom dryer showing Embodiment 1. FIG. 2 is a block diagram showing the configuration of control functions of the bathroom dryer showing Embodiment 1. FIG. 3 is a diagram showing an example of a hardware configuration of a processing circuit of the bathroom dryer showing Embodiment 1; FIG. FIG. 4 is a schematic cross-sectional view showing the downstream side of the circulation air passage when the rotary damper of the bathroom dryer showing Embodiment 1 is at the lower end position; 4 is a schematic cross-sectional view showing the downstream side of the circulation air passage when the rotary damper of the bathroom dryer showing Embodiment 1 is at the upper end position; FIG. 4 is a schematic cross-sectional view showing the downstream side of the circulation air passage when the rotary damper of the bathroom dryer according to Embodiment 1 is set at an intermediate position; FIG. 4 is a flow chart of control related to abnormality detection of the bathroom dryer according to the first embodiment. 4 is a flow chart of abnormality determination processing for the bathroom dryer according to the first embodiment. 4 is a flow chart of ventilation blower single operation processing of the bathroom dryer showing Embodiment 1. FIG. 4 is a flow chart of single operation processing of the circulation fan of the bathroom dryer showing Embodiment 1. FIG. FIG. 11 is a top view of the bathroom dryer showing Embodiment 2;

Embodiments will be described below with reference to the accompanying drawings. The same reference numerals are given to the same or corresponding parts in each figure.

Embodiment 1.
FIG. 1 is a schematic diagram showing a usage pattern of a bathroom dryer 1 according to Embodiment 1. FIG. Solid arrows in FIG. 1 indicate the direction of air flow. As shown in FIG. 1, the bathroom dryer 1 is installed on the ceiling of the bathroom 2 in this embodiment. A bathtub 3 is provided in the bathroom 2. - 特許庁Adjacent to the bathroom 2, a dressing room 4 in which a washbasin 5 is arranged is provided. A bathroom 2 and a dressing room 4 are separated by a door 6. - 特許庁At the bottom of the door 6, there is provided a louver 7 which is a ventilation port for communicating the bathroom 2 and the dressing room 4. - 特許庁An operation unit 80 for the user to operate the bathroom dryer 1 is provided on the wall surface of the dressing room 4 .

The bathroom dryer 1 can ventilate not only the bathroom 2 but also rooms other than the bathroom 2 in the building, such as a dressing room 4 and a toilet (hereinafter referred to as "other rooms" as appropriate). In this embodiment, as an example, the bathroom dryer 1 is connected to a ventilation duct 9 leading to a suction port 8 provided on the ceiling of a dressing room 4 which is another room. An exhaust duct 10 leading to the outside is connected to the bathroom dryer 1. - 特許庁

As indicated by the arrow in FIG. 1 , the bathroom dryer 1 can suck air in the bathroom 2 and blow the sucked air out to the bathroom 2 . Also, the bathroom dryer 1 can suck air in the bathroom 2 and discharge it to the outside through the exhaust duct 10 . Furthermore, the bathroom dryer 1 can suck in the air in the dressing room 4 through the suction port 8 and the ventilation duct 9 and discharge it to the outside through the exhaust duct 10 . Incidentally, when the bathroom dryer 1 sucks in the air in the bathroom 2, it is also possible to suck in the air in the dressing room 4 through the louver 7 of the door 6.

FIG. 2 is a schematic cross-sectional view of the bathroom dryer 1. As shown in FIG. FIG. 3 is a top view of the bathroom dryer 1. FIG. As shown in FIGS. 2 and 3, the bathroom dryer 1 includes a main body 20, a circulation fan 40, a ventilation fan 50, air path switching means 60, and a controller .

The body portion 20 constitutes a housing that accommodates the circulation fan 40 and the ventilation fan 50 . The main body 20 is provided with a bathroom inlet 21, a bathroom outlet 22, a ventilation inlet 23, an outlet 24, a circulation air passage 25, and a ventilation air passage 26. - 特許庁The bathroom suction port 21 is an opening for sucking air from the bathroom 2 . The bathroom air outlet 22 is an opening for blowing out the air sucked from the bathroom air inlet 21 to the bathroom 2 . The ventilation intake 23 is an opening for sucking air from rooms other than the bathroom 2 . In this embodiment, a ventilation duct 9 is connected to the ventilation inlet 23 . Therefore, it is possible to suck the air from the dressing room 4, which is another room, through the ventilation inlet 23 through the suction inlet 8 and the ventilation duct 9. The exhaust port 24 is an opening for discharging the air sucked from the bathroom suction port 21 and the ventilation suction port 23 to the outside, that is, to the outside of the bathroom 2 and other rooms. In this embodiment, an exhaust duct 10 is connected to the exhaust port 24 .

The circulation air passage 25 is an air passage from the bathroom air inlet 21 to the bathroom air outlet 22 . The ventilation air passage 26 is an air passage extending from the ventilation connection port 27 communicating with the circulation air passage 25 to the exhaust port 24 . Therefore, the circulation air passage 25 and the ventilation air passage 26 communicate with each other through the ventilation connection port 27 . In other words, the ventilation connection port 27 is an opening that allows the circulation air passage 25 and the ventilation air passage 26 to communicate with each other. Also, the ventilation air passage 26 communicates with the ventilation suction port 23 .

The circulation fan 40 is arranged in the circulation air passage 25 . The circulation fan 40 sucks air from the bathroom air inlet 21 and sends the sucked air to the bathroom air outlet 22 and the ventilation connection 27 . Therefore, the circulation fan 40 is arranged on the upstream side of the bathroom outlet 22 and the ventilation connection port 27 in the circulation air passage 25 . In the present embodiment, circulation fan 40 has circulation fan 41 that is an impeller, and circulation fan motor 42 that rotates circulation fan 41 . The circulation fan 41 is, for example, a sirocco fan, and is arranged to face the bathroom suction port 21 . The circulation fan 40 is also provided with a rotation speed sensor 43 that detects the rotation speed of the circulation fan 41 per unit time. Since the rotation speed of the circulation fan 41 and the rotation speed of the circulation fan motor 42 are the same as long as the shaft is not shaken, the rotation speed sensor 43 detects the rotation speed of the circulation fan motor 42 as the rotation speed of the circulation fan 41. Detect numbers.

In this embodiment, a dust filter 29 for removing dust in the air is arranged upstream of the bathroom suction port 21 . A design panel 30 covers the lower side of the main body 20 , that is, the side facing the inside of the bathroom 2 .

A heating unit 31 is provided in the air circulation path 25 . The heating unit 31 is arranged downstream of the ventilation connection port 27 and upstream of the bathroom outlet 22 in the circulation air passage 25 . The heating unit 31 heats the air blown out from the circulation fan 40 . The heating unit 31 is configured, for example, by arranging a plurality of heat generating elements at intervals or by providing a plurality of heat radiation fins around the heat generating elements. An air flow path is formed around the heating element and around the radiation fins. By allowing air to pass through the flow path, heat is radiated from the heating element to the air. As the heating element, for example, an electric heater is used in which the heating element surrounded by an electrical insulator having high thermal conductivity is housed in a metal pipe.

A ventilation blower 50 is arranged in the ventilation air passage 26 . The ventilation blower 50 sucks air from the ventilation connection port 27 and the ventilation suction port 23 and sends the sucked air to the exhaust port 24 . Therefore, the ventilation blower 50 is arranged downstream of the ventilation connection port 27 and the ventilation suction port 23 in the ventilation air passage 26 . In this embodiment, the ventilation fan 50 has a ventilation fan 51 that is an impeller and a ventilation fan motor 52 that rotates the ventilation fan 51 . The ventilation fan is, for example, a sirocco fan. Further, the ventilation fan 50 is provided with a rotational speed sensor 53 for detecting the rotational speed of the ventilation fan 51 per unit time. Since the rotation speed of the ventilation fan 51 and the rotation speed of the ventilation fan motor 52 are the same as long as the shaft is not shaken, the rotation speed sensor 53 detects the rotation speed of the ventilation fan motor 52 as the rotation speed of the ventilation fan 51. Detect numbers. A space between the ventilation fan 51 and the ventilation connection port 27 in the ventilation air passage 26 is a ventilation chamber 28 . A ventilation intake 23 opens into the ventilation chamber 28 .

The air passage switching means 60 has a first state in which the ventilation connection port 27 is opened and the downstream side of the circulation air passage 25 to the bathroom outlet 22 is closed, and a first state in which the ventilation connection port 27 is closed and the circulation air passage 25 is closed. and a second state in which the downstream side is open. In the first state, air sucked from the bathroom suction port 21 is led to the ventilation connection port 27 . In the second state, the air sucked from the bathroom air inlet 21 is guided downstream to the bathroom air outlet 22 of the circulation air passage 25 . In the present embodiment, the air path switching means 60 is arranged between the circulation fan 40 and the heating section 31 in the circulation air path 25 . The air passage switching means 60 includes a plate-shaped rotary damper 61 and a damper rotating shaft 62 . The rotary damper 61 is arranged in the circulation air passage 25 and rotates around a damper rotary shaft 62 provided at the base end. The rotary damper 61 is driven by driving means (not shown) such as a stepping motor.

The rotary damper 61 can be rotated downward to the downstream side of the air circulation passage 25 reaching the bathroom outlet 22 , that is, to a position (lower end position) blocking the downstream side of the rotary damper 61 in the circulation air passage 25 . At this time, the ventilation connection port 27 is open, and the circulation air passage 25 and the ventilation air passage 26 communicate with each other through the ventilation connection port 27 . Therefore, the air sucked from the bathroom suction port 21 flows to the ventilation air passage 26 via the ventilation connection port 27. - 特許庁Further, the rotary damper 61 can be rotated upward to a position (upper end position) that closes the ventilation connection port 27 . At this time, since the downstream side of the circulation air passage 25 is open, the air sucked from the bathroom air inlet 21 flows to the bathroom air outlet 22 . In addition, the rotary damper 61 can take any position between the lower end position and the upper end position. Thereby, the air sucked from the bathroom suction port 21 can be distributed to the ventilation air passage 26 side and the downstream side of the circulation air passage 25 at an arbitrary flow rate ratio.

The control unit 70 controls operations of the circulation fan 40 , the ventilation fan 50 and the air path switching means 60 . FIG. 4 is a block diagram showing the configuration of the control functions of the bathroom dryer 1. As shown in FIG. In the present embodiment, the control unit 70 is electrically connected to each of the circulation fan 40, the ventilation fan 50, the heating unit 31, the air path switching means 60, the operation unit 80, and the notification unit 90 by signal lines (not shown). It is A controller 70 is connected to the circulation fan motor 42 and the rotation speed sensor 43 so as to be able to communicate with the circulation fan 40 . Therefore, the control unit 70 can control the rotation of the circulation fan motor 42 and acquire the rotation speed data of the rotation speed sensor 43 . Similarly, for the ventilation fan 50 , the control unit 70 is communicably connected to the ventilation fan motor 52 and the rotation speed sensor 53 . Therefore, the control unit 70 can control the rotation of the ventilation fan motor 52 and acquire the rotation speed data of the rotation speed sensor 53 . The control unit 70 controls the circulation fan 40, the ventilation fan 50, the heating unit 31, and the air path switching means 60 according to the operation command input from the operation unit 80, and performs the ventilation operation etc. of the bathroom dryer 1. Let The controller 70 is arranged above the circulation fan motor 42 of the circulation fan 40 . Also, the control unit 70 is connected to a commercial power supply (not shown).

The functions of the control unit 70 are realized, for example, as a processing circuit having the hardware configuration shown in FIG. FIG. 5 is a diagram illustrating an example of a hardware configuration of a processing circuit; The functions of the control unit 70 are implemented by executing a program stored in the memory 72 by the processor 71 shown in FIG. 5, for example. Also, multiple processors and multiple memories may work together to achieve the above functions. Also, part of the functions of the control unit 70 may be implemented as an electronic circuit, and other parts may be realized using the processor 71 and the memory 72 .

In the present embodiment, bathroom dryer 1 further includes operation unit 80 and notification unit 90 . The operation unit 80 is a remote controller for the user to operate the bathroom dryer 1 . The operation unit 80 is communicably connected to the control unit 70 via a signal line (not shown). Therefore, the operation command from the operation unit 80 is transmitted to the control unit 70 via a signal line (not shown). Further, the operation unit 80 has a display unit (not shown) configured by an LED, a liquid crystal display, etc., and can display an operation mode, etc., which will be described later, by this display unit. A mobile terminal such as a smartphone may be used as the operation unit 80. In this case, the operation unit 80 may communicate with the control unit 70 by a wireless communication method via a communication network.

When the control unit 70 detects an abnormality in the circulation fan 40 and the ventilation fan 50, the notification unit 90 notifies the user to that effect. The notification unit 90 is communicably connected to the control unit 70 via a signal line (not shown). The notification unit 90 can notify the user of the abnormality by displaying the abnormality using the display unit provided in the operation unit 80, for example.

In this embodiment, the bathroom dryer 1 has five operation modes: ventilation operation, heating operation, drying operation, cooling operation, and wind drying operation. These operation modes can be switched by the operation unit 80 . Furthermore, the bathroom dryer 1 has a 24-hour ventilation function.

The ventilation operation is an operation in which the air in the bathroom 2 and other rooms is discharged to the outside by the ventilation blower 50 . FIG. 6 is a schematic cross-sectional view showing the downstream side of the circulation air passage 25 when the rotary damper 61 constituting the air passage switching means 60 of the bathroom dryer 1 is at the lower end position. In the ventilation operation, as shown in FIG. 6, the controller 70 controls the rotation position of the rotary damper 61 to the lower end position. The control unit 70 drives the ventilation fan 50 while the circulation fan 40 remains stopped without being driven. As a result, the air in the bathroom 2 that has flowed into the circulation air passage 25 from the bathroom suction port 21 flows into the ventilation air passage 26 through the ventilation connection port 27, is sucked into the ventilation blower 50, and is discharged from the air outlet 24 to the outside. Ejected. Further, the air in the other room that has flowed into the ventilation air passage 26 from the ventilation suction port 23 is also sucked into the ventilation blower 50 and discharged to the outside from the exhaust port 24. - 特許庁Note that the control unit 70 does not energize the heating unit 31 .

In ventilation operation, the user can set the ventilation air volume using the operation unit 80 . The ventilation air volume is the air volume that flows from the circulation air passage 25 to the ventilation air passage 26 through the ventilation connection port 27 . In the ventilation operation, the ventilation air volume changes depending on the rotation speed of the ventilation fan 50 . Therefore, by changing the rotational speed of the ventilation blower 50 using the operation unit 80, the ventilation air volume can be changed. The control unit 70 changes the number of rotations of the ventilation fan 50 , that is, the number of rotations of the ventilation fan motor 52 , according to a command from the operation unit 80 . Along with this, the amount of air sucked by the ventilation blower 50 changes, and the amount of ventilation air changes. The rotation speed of the ventilation blower 50 may be set stepwise in advance, for example, a weak notch that is a low rotation speed and a strong notch that is a high rotation speed. may be set to

The heating operation is an operation in which air sucked from the bathroom 2 by the circulation fan 40 is heated by the heating unit 31 and blown into the bathroom 2 to heat the bathroom 2 . FIG. 7 is a schematic cross-sectional view showing the downstream side of the circulation air passage 25 when the rotary damper 61 constituting the air passage switching means 60 of the bathroom dryer 1 is at the upper end position. In the heating operation, as shown in FIG. 7, the controller 70 controls the rotation position of the rotary damper 61 to the upper end position. The control unit 70 drives the circulation fan 40 while the ventilation fan 50 remains stopped without being driven. Further, the control unit 70 energizes the heating unit 31 . As a result, the air in the bathroom 2 that has flowed into the circulation air passage 25 from the bathroom suction port 21 is sucked into the circulation blower 40 , passes through the heating part 31 , and is blown out from the bathroom outlet 22 into the bathroom 2 . The air is heated while passing through the heating unit 31 and is blown out into the bathroom 2 as warm air. By this, heating in the bathroom 2 is performed.

In the heating operation, the user can set the circulating air volume and the heating intensity using the operation unit 80 . The circulating air volume is the volume of air blown out from the bathroom outlet 22 through the circulating air path 25 . In the heating operation, the amount of circulating air changes depending on the rotation speed of the circulating fan 40 . Therefore, by changing the rotation speed of the circulation fan 40 using the operation unit 80, the circulating air volume can be changed. The control unit 70 changes the rotation speed of the circulation fan 40 , that is, the rotation speed of the circulation fan motor 42 , according to a command from the operation unit 80 . Along with this, the amount of air sucked by the circulation fan 40 changes, and the amount of ventilation air changes. The rotation speed of the circulation fan 40 may be set stepwise in advance, for example, a weak notch for a low rotation speed and a strong notch for a high rotation speed. may be set to

Also, the heating intensity corresponds to the temperature of the air blown out from the bathroom outlet 22 . The heating intensity changes depending on the amount of heat generated by the heating unit 31 . Therefore, by changing the amount of heat generated by the heating unit 31 using the operation unit 80, the heating intensity can be changed. For example, when the heating unit 31 is composed of a plurality of electric heaters, the control unit 70 changes the number of electric heaters to be energized according to instructions from the operation unit 80 . Along with this, the amount of heat generated by the heating unit 31 changes, and the heating intensity changes. The heating intensity may be set stepwise in advance, for example, high to energize a large number of electric heaters, and low to energize a smaller number of electric heaters than high, and can be switched to each by the operation unit 80. may be set as

The drying operation is an operation for ventilating the bathroom 2 and other rooms and sending warm air into the bathroom 2 . In the drying operation, the control unit 70 drives both the circulation fan 40 and the ventilation fan 50 and energizes the heating unit 31 . The air sucked from the bathroom 2 by driving the circulation fan 40 is divided by the air passage switching means 60 into the downstream side of the circulation air passage 25 and the ventilation air passage 26 side. The air diverted to the downstream side of the circulation air passage 25 is heated by the heating section 31 and blown out from the bathroom outlet 22 into the bathroom 2 as warm air. The air diverted to the ventilation air passage 26 side is discharged to the outside from the exhaust port 24 together with the air sucked from the ventilation suction port 23 by the ventilation blower 50 . Thus, drying in the bathroom 2 is performed.

FIG. 8 is a schematic cross-sectional view showing the downstream side of the circulation air passage 25 when the rotary damper 61 constituting the air passage switching means 60 of the bathroom dryer 1 is set at an intermediate position between the lower end position and the upper end position. . In the drying operation, as shown in FIG. 8, the controller 70 controls the rotation position of the rotary damper 61 to the intermediate position. Therefore, the air sucked from the bathroom suction port 21 and flowed into the circulation air passage 25 can flow into the ventilation air passage 26 through the ventilation connection port 27, and the circulation air passage 25 in which the heating unit 31 is arranged. can also flow into the downstream side of In the drying operation, the controller 70 adjusts the rotational position of the rotary damper 61 so that the circulation air volume is larger than the ventilation air volume. Therefore, the control unit 70 normally controls the rotational position of the rotary damper 61 to be closer to the upper end position than to the lower end position. Also, in the dry operation, the user can switch the operation intensity using the operation unit 80 . The operating intensity is, for example, a preset combination of the number of revolutions of the circulation fan 40, the number of revolutions of the ventilation fan 50, and the number of energizations of the electric heater of the heating unit 31, and can be set to strong or weak depending on the usage conditions. Each combination may be set and set so that it can be switched to each by the operation unit 80 .

The cool breeze operation is an operation that discharges the moisture in the bathroom 2 and sends cool air into the bathroom 2, and is effective for hot and humid bathing in the summer and for relieving the hot water. In the cool air operation, the control unit 70 drives both the circulation fan 40 and the ventilation fan 50, but does not energize the heating unit 31. FIG. The air sucked from the bathroom 2 by driving the circulation fan 40 is divided by the air passage switching means 60 into the downstream side of the circulation air passage 25 and the ventilation air passage 26 side. The air diverted to the downstream side of the circulation air passage 25 is blown out into the bathroom 2 from the bathroom air outlet 22 without being heated by the heating unit 31 and maintaining the temperature of the air in the bathroom 2 . The air diverted to the ventilation air passage 26 side is discharged to the outside from the exhaust port 24 together with the air sucked from the ventilation suction port 23 by the ventilation blower 50 . As a result, heat is discharged from the inside of the bathroom 2 to the outside.

In the cool air operation, as in the dry operation, as shown in FIG. 8, the control unit 70 controls the rotation position of the rotary damper 61 to an intermediate position between the lower end position and the upper end position. Therefore, the air sucked from the bathroom suction port 21 and flowed into the circulation air passage 25 can flow into the ventilation air passage 26 through the ventilation connection port 27, and can also flow into the downstream side of the circulation air passage 25. is. Also, in cool air operation, the control unit 70 adjusts the rotational position of the rotary damper 61 so that the circulation air volume is larger than the ventilation air volume. Therefore, the control unit 70 normally controls the rotational position of the rotary damper 61 to be closer to the upper end position than to the lower end position. Also, in the cool breeze operation, the user can switch the operation intensity using the operation unit 80 . The operating strength is, for example, a combination of the number of rotations of the circulation fan 40 and the number of rotations of the ventilation fan 50 set in advance. It may be set so that it can be switched to each by .

The wind drying operation is an operation in which the bathroom 2 is dried by air blowing and ventilation without using warm air. In the wind drying operation, the control unit 70 drives both the circulation fan 40 and the ventilation fan 50, but does not energize the heating unit 31. FIG. The air sucked from the bathroom 2 by driving the circulation fan 40 is divided by the air passage switching means 60 into the downstream side of the circulation air passage 25 and the ventilation air passage 26 side. The air diverted to the downstream side of the circulation air passage 25 is blown out into the bathroom 2 from the bathroom air outlet 22 without being heated by the heating unit 31 and maintaining the temperature of the air in the bathroom 2 . The air diverted to the ventilation air passage 26 side is discharged to the outside from the exhaust port 24 together with the air sucked from the ventilation suction port 23 by the ventilation blower 50 .

In the wind drying operation, as in the drying operation and the cool air operation, as shown in FIG. 8, the controller 70 controls the rotation position of the rotary damper 61 to an intermediate position between the lower end position and the upper end position. Therefore, the air sucked from the bathroom suction port 21 and flowed into the circulation air passage 25 can flow into the ventilation air passage 26 through the ventilation connection port 27, and can also flow into the downstream side of the circulation air passage 25. is. Further, in the wind drying operation, the control unit 70 adjusts the rotation position of the rotary damper 61 so that the ventilation air volume is larger than the circulation air volume. Therefore, the control unit 70 normally controls the rotation position of the rotary damper 61 to a position closer to the lower end position than the upper end position. Also, in the wind drying operation, the user can switch the operation intensity using the operation unit 80 . The operating strength is, for example, a combination of the number of rotations of the circulation fan 40 and the number of rotations of the ventilation fan 50 set in advance. It may be set so that it can be switched to each by . Unlike the drying operation, the wind drying operation dries the bathroom 2 without using warm air, so the drying time is longer than that of the drying operation. However, since the heating unit 31 is not energized, the inside of the bathroom 2 can be dried with small power consumption, resulting in energy saving.

The 24-hour ventilation function is a function capable of constantly ventilating a room at a ventilation rate equal to or higher than half of the air in the room per hour, which is stipulated in the Building Standards Act. The 24-hour ventilation function can be operated when the operation mode is not selected and during the heating operation. When the 24-hour ventilation function is ON when the operation mode is not selected and the ventilation function is ON, the control unit 70 controls the rotation position of the rotary damper 61 to the lower end position, as shown in FIG. Further, the control unit 70 drives the ventilation fan 50 while the circulation fan 40 remains stopped without being driven. At this time, the control unit 70 controls the number of rotations of the ventilation fan 50 to be constant at a number of rotations that satisfies the prescribed ventilation amount described above. As a result, the air in the bathroom 2 that has flowed into the circulation air passage 25 from the bathroom suction port 21 flows into the ventilation air passage 26 through the ventilation connection port 27, is sucked into the ventilation blower 50, and is discharged from the air outlet 24 to the outside. Ejected. Further, the air in the other room that has flowed into the ventilation air passage 26 from the ventilation suction port 23 is also sucked into the ventilation blower 50 and discharged to the outside from the exhaust port 24. - 特許庁Note that the control unit 70 does not energize the heating unit 31 .

Further, when the 24-hour ventilation function is ON during heating operation, the control unit 70 controls the rotation position of the rotary damper 61 to an intermediate position between the lower end position and the upper end position, as shown in FIG. Therefore, the air sucked from the bathroom suction port 21 and flowed into the circulation air passage 25 can flow not only to the downstream side of the circulation air passage 25 but also to the ventilation air passage 26 through the ventilation connection port 27 . Further, the control unit 70 drives the ventilation blower 50 at a constant number of revolutions that satisfies the prescribed ventilation amount described above. As a result, part of the air sucked from the bathroom suction port 21 flows into the ventilation air passage 26 through the ventilation connection port 27, is sucked into the ventilation blower 50, and is discharged from the exhaust port 24 to the outside. At the same time, the air in the other room that flows into the ventilation air passage 26 from the ventilation suction port 23 is also sucked into the ventilation blower 50 and discharged to the outside from the exhaust port 24. - 特許庁Ventilation in the bathroom 2 is thus performed.

Next, an operation related to abnormality detection of the bathroom dryer 1 will be described. FIG. 9 is a flow chart of control relating to abnormality detection of the bathroom dryer 1 .

When the bathroom dryer 1 is powered on, the control of the flow chart shown in FIG. 9 is started. First, the control unit 70 checks the states of the abnormality flags of the circulation fan 40 and the ventilation fan 50 (step S01). The abnormality flag takes two states, ON and OFF, and indicates that there is an abnormality when ON, and indicates that there is no abnormality, ie, normality, when OFF. Depending on the combination of the state of the abnormality flag of circulation fan 40 and the state of the abnormality flag of ventilation fan 50, the process branches from step S02 to step S05.

In step S01, if the abnormality flag of circulation fan 40 is OFF and the abnormality flag of ventilation fan 50 is OFF, that is, if both circulation fan 40 and ventilation fan 50 are normal, the process proceeds to step S02. In step S<b>02 , the control unit 70 starts operating the bathroom dryer 1 according to the operation instruction from the operation unit 80 . After that, the process proceeds to step S06.

In step S01, when the abnormality flag of circulation fan 40 is ON and the abnormality flag of ventilation fan 50 is OFF, that is, when circulation fan 40 is abnormal and ventilation fan 50 is normal, the process proceeds to step S03. In step S03, processing for a ventilation blower single operation, which will be described later, is performed. After that, the process proceeds to step S06.

In step S01, if the abnormality flag of circulation fan 40 is OFF and the abnormality flag of ventilation fan 50 is ON, that is, if circulation fan 40 is normal and ventilation fan 50 is abnormal, the process proceeds to step S04. In step S04, processing for single operation of the circulation fan, which will be described later, is performed. After that, the process proceeds to step S06.

In step S01, if the abnormality flag of circulation fan 40 is ON and the abnormality flag of ventilation fan 50 is ON, that is, if both circulation fan 40 and ventilation fan 50 are abnormal, the process proceeds to step S05. In step S05, control unit 70 causes notification unit 90 to notify that circulation fan 40 and ventilation fan 50 are abnormal. After that, this control flow ends.

In step S<b>06 , processing for judging abnormality of circulation fan 40 and ventilation fan 50 is performed. In other words, it is determined whether or not an abnormality in the circulation fan 40 has been detected and whether or not an abnormality in the ventilation fan 50 has been detected. Through this abnormality determination process, the abnormality flag information (ON or OFF) of the circulation fan 40 and the abnormality flag information (ON or OFF) of the ventilation fan 50 are updated. The abnormality flags of the circulation fan 40 and the ventilation fan 50 are set to OFF at the time of shipment from the factory. Information of each abnormality flag is stored in the control unit 70, and can be stored even when the power of the bathroom dryer 1 is turned off. After the processing of step S06, the process returns to step S01 to check the state of the abnormality flag again.

The abnormality determination process in step S06 will be described. FIG. 10 is a flow chart of abnormality determination processing for circulation fan 40 and ventilation fan 50 . In FIG. 10 , steps S10 to S15 are processing related to the abnormality determination of the ventilation fan 50 , and steps S16 to S21 are processing related to the abnormality determination of the circulation fan 40 .

First, the control unit 70 determines whether or not there is an operation instruction for the ventilation fan 50 based on the operation instruction from the operation unit 80 (step S10). For example, when there is an operation instruction for ventilation operation, dry operation, cool air operation, or wind dry operation from the operation unit 80, the ventilation blower 50 is driven in these operations, so the control unit 70 receives the operation instruction for the ventilation blower 50. I judge. If it is determined that there is an instruction to operate the ventilation fan 50, the process proceeds to step S11, and if it is determined that there is no instruction to operate the ventilation fan 50, the process proceeds to step S16.

In step S11, the control unit 70 determines whether or not the rotational speed of the ventilation fan 50 is an abnormal rotational speed. Specifically, the control unit 70 determines whether or not the rotation speed detected by the rotation speed sensor 53 of the ventilation fan 50 is included in a preset abnormal rotation speed range. For example, the normal rotation speed of the ventilation fan 50 is set to 250 to 2000 rpm, and the abnormal rotation speed is set to 200 rpm or less or 2500 rpm or more with a slight margin between the normal rotation speed and the abnormal rotation speed. In this case, if the rotation speed detected by the rotation speed sensor 53 is 150 rpm, the control unit 70 determines that the rotation speed of the ventilation fan 50 is included in the abnormal rotation speed range, and determines that the rotation speed of the ventilation fan 50 is is determined to be an abnormal rotation speed. Further, when the rotation speed detected by the rotation speed sensor 53 is 1000 rpm, the control unit 70 determines that the rotation speed of the ventilation fan 50 is not included in the abnormal rotation speed range, and the rotation speed of the ventilation fan 50 is is determined not to be an abnormal rotation speed. If it is determined that the rotation speed of the ventilation fan 50 is abnormal, the process proceeds to step S12, and if it is determined that the rotation speed of the ventilation fan 50 is not abnormal, the process proceeds to step S16.

In step S12, the control unit 70 determines whether or not the abnormal rotation speed of the ventilation fan 50 continues for a preset time. Specifically, the control unit 70 determines whether or not the rotational speed detected by the rotational speed sensor 53 of the ventilation fan 50 is continuously within the range of the abnormal rotational speed for the predetermined time. This determination prevents a situation in which the rotation speed of the ventilation fan 50 temporarily enters an abnormal rotation speed range immediately after starting or immediately before stopping the ventilation fan 50 from being determined to be abnormal. For example, 5 seconds is set as the predetermined time. In this case, when the rotation speed of the ventilation fan 50 is continuously within the range of the abnormal rotation speed for 5 seconds, the control unit 70 determines that the abnormal rotation speed of the ventilation fan 50 continues for a predetermined time. When it is determined that the abnormal rotation speed of the ventilation fan 50 continues for the predetermined time, the process proceeds to step S13. When it is determined that the abnormal rotation speed of the ventilation fan 50 does not continue for the predetermined time, the process returns to step S11, and it is again determined whether or not the rotation speed of the ventilation fan 50 is the abnormal rotation speed.

In step S13, the controller 70 stops the ventilation fan 50 and restarts it. After that, the process proceeds to step S14.

In step S14, the control unit 70 determines whether or not the number of times the ventilation fan 50 has been continuously restarted is equal to or greater than a preset number of times. If it is determined that the number of times the ventilation blower 50 has been restarted is equal to or greater than the predetermined number of times, the process proceeds to step S15. For example, the predetermined number of times is set to 5 times. If it is determined that the number of times the ventilation fan 50 has been restarted is less than the predetermined number of times, the process returns to step S11. Therefore, the processing from step S11 to step S14 is repeated until the number of restarts of the ventilation fan 50 reaches a predetermined number.

In step S15, the control unit 70 stops the ventilation fan 50 and sets the abnormality flag of the ventilation fan 50 to ON. After that, the process proceeds to step S16.

The processing from step S16 to step S21 is basically the same as the processing from step S10 to step S15, except that the abnormality determination target differs between the circulation fan 40 and the ventilation fan 50 .

In step S<b>16 , the control unit 70 determines whether or not there is an operation instruction for the circulation fan 40 based on the operation instruction from the operation unit 80 . For example, when there is an operation instruction for heating operation, drying operation, cool air operation, or wind drying operation from the operation unit 80, the circulation fan 40 is driven in these operations, so the control unit 70 receives the operation instruction for the circulation fan 40. I judge. If it is determined that there is an instruction to operate the circulation fan 40, the process proceeds to step S17. If it is determined that there is no instruction to operate the circulation fan 40, the abnormality determination process is terminated.

In step S17, the control unit 70 determines whether or not the rotation speed of the circulation fan 40 is an abnormal rotation speed. Specifically, the control unit 70 determines whether or not the rotation speed detected by the rotation speed sensor 43 of the circulation fan 40 is included in a preset abnormal rotation speed range. For example, the normal rotation speed of the circulation fan 40 is set to 250 to 2000 rpm, and the abnormal rotation speed is set to 200 rpm or less or 2500 rpm or more with a slight margin between the normal rotation speed and the abnormal rotation speed. If it is determined that the rotation speed detected by the rotation speed sensor 43 is within the range of the abnormal rotation speed and the rotation speed of the circulation fan 40 is the abnormal rotation speed, the process proceeds to step S18. When it is determined that the rotation speed detected by the rotation speed sensor 43 is not included in the range of the abnormal rotation speed and the rotation speed of the circulation fan 40 is not the abnormal rotation speed, the abnormality determination process is ended.

In step S18, the control unit 70 determines whether or not the abnormal rotation speed of the circulation fan 40 continues for a preset time. Specifically, the control unit 70 determines whether or not the rotation speed detected by the rotation speed sensor 43 of the circulation fan 40 is continuously within the range of the abnormal rotation speed for the predetermined time. For example, the predetermined time is set to 5 seconds. When it is determined that the rotation speed of the circulation fan 40 is continuously within the range of the abnormal rotation speed for the predetermined time and the abnormal rotation speed of the circulation fan 40 continues for the predetermined time, the process proceeds to step S19. When it is determined that the rotation speed of the circulation fan 40 is not included in the range of the abnormal rotation speed continuously for the predetermined time and the abnormal rotation speed of the circulation fan 40 does not continue for the predetermined time, the process returns to step S17, and the circulation fan is restarted. A determination is made as to whether or not the number of rotations of 40 is an abnormal number of rotations.

In step S19, the control unit 70 stops the circulation fan 40 and restarts it. After that, the process proceeds to step S20.

In step S20, the control unit 70 determines whether or not the number of times the circulation fan 40 has been restarted in succession is equal to or greater than a preset number of times. If it is determined that the number of times the circulation fan 40 has been restarted is equal to or greater than the predetermined number of times, the process proceeds to step S21. For example, the predetermined number of times is set to 5 times. If it is determined that the number of times the circulation fan 40 has been restarted is less than the predetermined number of times, the process returns to step S17. Therefore, the processing from step S17 to step S20 is repeated until the number of restarts of the circulation fan 40 reaches a predetermined number.

In step S21, the control unit 70 stops the circulation fan 40 and sets the abnormality flag of the circulation fan 40 to ON. After that, the abnormality determination process is ended. In this abnormality determination process, the process of determining abnormality of the circulation fan 40 in steps S16 to S21 and the process of determining abnormality of the ventilation fan 50 in steps S10 to S15 may be performed in a different order. .

Next, the ventilation fan single operation process of step S03 will be described. FIG. 11 is a flow chart of ventilation fan single operation processing.

First, the control unit 70 causes the notification unit 90 to notify that an abnormality has occurred in the circulation fan 40 (step S30). Next, the control unit 70 opens the ventilation connection port 27 and closes the downstream side of the circulation air passage 25 by controlling the rotational position of the rotary damper 61 of the air passage switching means 60 to the lower end position (step S31). ).

Subsequently, the process proceeds to step S32, and the control unit 70 determines whether or not there is an operation instruction for the ventilation operation from the operation unit 80. If it is determined that there is an operation instruction for ventilation operation, the process proceeds to step S33. In step S<b>33 , the control unit 70 drives the ventilation fan 50 at a rotational speed corresponding to the operation instruction for the ventilation operation from the operation unit 80 . Then, this ventilation fan single operation processing ends. Also, if it is determined in step S32 that there is no operation instruction for the ventilation operation, this ventilation fan single operation processing is terminated as it is. In this way, in this ventilation fan single operation process, an operation instruction other than the ventilation operation is not accepted.

Next, the circulation fan single operation process of step S04 will be described. FIG. 12 is a flow chart of the circulation fan single operation process.

First, the control unit 70 causes the notification unit 90 to notify that an abnormality has occurred in the ventilation fan 50 (step S40). Next, the control unit 70 determines whether or not there is an operation instruction for ventilation operation from the operation unit 80 (step S41). If it is determined that there is an operation instruction for ventilation operation, the process proceeds to step S42. In step S42, the control unit 70 opens the ventilation connection port 27 and closes the downstream side of the circulation air passage 25 by controlling the rotation position of the rotary damper 61 of the air passage switching means 60 to the lower end position. Subsequently, in step S<b>43 , the control unit 70 drives the circulation fan 40 at a rotation speed corresponding to the ventilation operation instruction from the operation unit 80 . In this case, the ventilation operation is performed only by the circulation fan 40 while the ventilation fan 50 is stopped. Then, this circulating fan single operation processing ends.

If it is determined in step S41 that there is no operation instruction for ventilation operation, the process proceeds to step S44. In step S<b>44 , the control unit 70 determines whether or not there is an operation instruction for the circulation fan 40 based on the operation instruction from the operation unit 80 . For example, when there is an operation instruction for heating operation, drying operation, cool air operation, or wind drying operation from the operation unit 80, the circulation fan 40 is driven in these operations, so the control unit 70 receives the operation instruction for the circulation fan 40. I judge. When it is determined that there is an operation instruction for the circulation fan 40, the control unit 70 controls the rotation damper 61 of the air path switching means 60 to a rotational position corresponding to the operation instruction from the operation unit 80, and the operation unit 80 The circulation fan 40 is driven at a rotation speed corresponding to the operation instruction from (step S45). In this case, operations such as the heating operation and the drying operation are performed with the ventilation blower 50 stopped. Also, if it is determined in step S44 that there is no operation instruction for the circulation fan 40, this circulation fan single operation processing is terminated. In this circulation fan single operation process, an instruction to use the 24-hour ventilation function and other operation modes together is not accepted.

As described above, the bathroom dryer 1 according to the present embodiment includes the bathroom air inlet 21 for sucking air from the bathroom 2, the bathroom air outlet 22 for blowing the sucked air to the bathroom 2, A ventilation inlet 23 for sucking air from rooms other than the bathroom 2, an outlet 24 for discharging the sucked air to the outside, and a circulation air passage 25 from the bathroom inlet 21 to the bathroom outlet 22. , a ventilation connection port 27 that communicates with the circulation air path 25 to the exhaust port 24, and a ventilation air path 26 that communicates with the ventilation suction port 23; A circulation fan 40 that sucks air from the suction port 21 and sends it to at least one of the bathroom outlet 22 and the ventilation connection port 27; A ventilation blower 50 sent to the port 24, a first state in which the ventilation connection port 27 is opened and the downstream side of the circulation air passage 25 to the bathroom outlet 22 is closed, and a ventilation connection port 27 is closed and the circulation air passage 25, the second state in which the downstream side of 25 is open; 70 determines whether or not an abnormality of the ventilation fan 50 is detected and whether or not an abnormality of the circulation fan 40 is detected. In addition, when there is an instruction to drive the ventilation fan 50 to discharge the air of the bathroom 2 and other rooms to the outside, the ventilation fan 50 is stopped and the circulation fan 40 is driven in the first state.

With such a configuration, even if an abnormality of the ventilation fan 50 is detected, if an abnormality of the circulation fan 40 is not detected, the ventilation connection port 27 is opened and the downstream side of the circulation air passage 25 is closed. By driving the circulation fan 40 in the first state, air is sucked from the bathroom suction port 21, and the sucked air can be discharged to the outside from the exhaust port 24 through the ventilation connection port 27 and the ventilation air passage 26, Ventilation of the bathroom 2 can be implemented. Therefore, even if normal ventilation operation cannot be performed due to an abnormality in the ventilation fan 50, ventilation can be continued by driving the circulation fan 40 in this way.

Further, the control method of the bathroom dryer 1 according to the present embodiment includes a bathroom air inlet 21 for sucking air from the bathroom 2, a bathroom air outlet 22 for blowing the sucked air to the bathroom 2, and a bathroom 2 A ventilation inlet 23 for sucking air from other rooms, an outlet 24 for discharging the sucked air to the outside, a circulation air passage 25 from the bathroom inlet 21 to the bathroom outlet 22, and a circulation A main body part 20 provided with a ventilation air passage 26 extending from a ventilation connection port 27 communicating with an air passage 25 to an exhaust port 24 and communicating with a ventilation suction port 23, and a bathroom suction port arranged in a circulation air passage 25. a circulation fan 40 that sucks air from 21 and sends it to at least one of the bathroom outlet 22 and the ventilation connection 27; A first state in which the ventilation blower 50 sent to the ventilation connection port 27 is opened and the downstream side to the bathroom outlet 22 of the circulation air passage 25 is closed, and the ventilation connection port 27 is closed and the circulation air passage 25 A bathroom dryer 1 comprising an air passage switching means 60 for switching between a second state in which the downstream side is open and a control unit 70 for controlling the operations of the circulation fan 40, the ventilation fan 50, and the air passage switching means 60. A control method comprising: a step of determining whether or not the control unit 70 has detected an abnormality in the ventilation fan 50; a step of determining whether or not the control unit 70 has detected an abnormality in the circulation fan 40; A step in which the control unit 70 drives the ventilation blower 50 to determine whether or not there is an instruction for ventilation operation to discharge the air of the bathroom 2 and other rooms to the outside; a step of stopping the ventilation fan 50, switching the air path switching means 60 to the first state, and driving the circulation fan 40 when an abnormality of the circulation fan 40 is not detected and ventilation operation is instructed; , is included.

As a result, when an abnormality of the ventilation fan 50 is detected and no abnormality of the circulation fan 40 is detected and there is an instruction for ventilation operation, the ventilation fan 50 is stopped, the ventilation connection port 27 is opened, and the circulation air path 25 is opened. The air path switching means 60 is switched to the first state in which the downstream side of the is closed, and the circulation fan 40 is driven. The air can be discharged to the outside from the exhaust port 24 through the ventilation connection port 27 and the ventilation air passage 26 . Thereby, the bathroom 2 can be ventilated. Therefore, even if normal ventilation operation cannot be performed due to an abnormality in the ventilation fan 50, ventilation can be continued.

In the present embodiment, the room other than the bathroom 2 that is ventilated is the dressing room. In this case, in the above description, one ventilation inlet 23 is provided in the main body 20, but a plurality of ventilation inlets 23 may be provided in the main body 20 corresponding to the number of other rooms. good.

Embodiment 2.
Next, Embodiment 2 will be described with reference to FIG. FIG. 13 is a top view of bathroom dryer 101 in this embodiment. In this embodiment, the description of the same parts as in the first embodiment will be omitted.

The bathroom dryer 101 further includes a backflow prevention means 33 that prevents the air sucked from the bathroom suction port 21 from flowing back from the ventilation suction port 23 to another room. In this embodiment, the backflow prevention means 33 has a plate-like opening/closing damper 34 and a rotating shaft 35 . The open/close damper 34 swings about a rotating shaft 35 to open and close the ventilation inlet 23 . The opening/closing damper 34 is swung by wind pressure, for example. When the wind flows from the ventilation air passage 26 to the ventilation suction port 23, the wind pressure causes the open/close damper 34 to swing in the closing direction to close the ventilation suction port 23 to prevent backflow. When the air flows from the ventilation suction port 23 to the ventilation air passage 26, the ventilation suction port 23 can be opened to allow the air to flow to the ventilation air passage 26. - 特許庁Also, the opening/closing damper 34 may be swung by a driving means (not shown) such as a stepping motor. In this case, by controlling the driving means with the control section 70, the open/close damper 34 can be opened and closed at will, and backflow can be prevented. For example, the control unit 70 closes the open/close damper 34 during single operation of the circulation fan to prevent backflow from the ventilation suction port 23 to the other room.

Normally, in the ventilation operation, the ventilation blower 50 is driven to draw air from the ventilation suction port 23 and the ventilation connection port 27, so air does not flow back from the ventilation suction port 23 to other rooms. However, in the bathroom dryer 1 according to Embodiment 1, when the circulation fan single operation is performed when the abnormality of the ventilation fan 50 is detected, the air is sucked from the bathroom suction port 21 by the circulation fan 40 and through the ventilation connection port 27. There is a possibility that part of the air sent to the ventilation air passage 26 through the ventilation air passage 26 will flow back into another room from the ventilation suction port 23 communicating with the ventilation air passage 26 . If the damp air and odor in the bathroom 2 flow back into the other room in this way, there is a possibility that the walls of the other room will become dirty or moldy.

In this embodiment, the bathroom dryer 101 is provided with the backflow prevention means 33, so that the air sucked from the bathroom suction port 21 can be prevented from flowing back from the ventilation suction port 23 to another room. Therefore, even when the circulation fan is operated alone, the air in the bathroom 2 can be prevented from flowing to other rooms, and the moist air in the bathroom 2 can be prevented from moving to other rooms such as the dressing room 4. .

In the present embodiment, the opening/closing damper 34 as the backflow preventing means 33 is used to open/close the ventilation inlet 23, but the present invention is not limited to this. For example, the backflow prevention means 33 may be configured to prevent backflow by switching the angle of the air passage at the ventilation suction port 23, as long as it can prevent backflow from the ventilation suction port 23 to another room. The type of mechanism does not matter.

Embodiment 3.
Next, Embodiment 3 will be described. Note that descriptions of the same portions of the present embodiment as those of the above-described embodiment will be omitted.

In the present embodiment, in the circulation fan single operation (step S04), which is performed when the abnormality of the ventilation fan 50 is detected but the abnormality of the circulation fan 40 is not detected, there is an operation instruction for the ventilation operation (step S41). When the circulation fan 40 is driven (step S43), the controller 70 controls the rotation speed of the circulation fan 40 as follows. That is, the control unit 70 drives the circulation fan 40 at a rotation speed equal to or higher than the highest rotation speed among the rotation speeds of the circulation fan 40 driven when neither the ventilation fan 50 nor the circulation fan 40 detects an abnormality. . Specifically, when both the ventilation fan 50 and the circulation fan 40 are normal, the circulation fan 40 operates in one of the heating operation, drying operation, cooling operation, and wind drying operation. Operation intensity and the like are set for each operation mode, and the rotational speed of the circulation fan 40 is set for each operation mode. When there is an operation instruction for the ventilation operation in the circulation fan single operation, the control unit 70 drives the circulation fan 40 at a rotation speed equal to or higher than the highest rotation speed among these rotation speeds.

When ventilation is performed only with the circulation fan 40 in the circulation fan single operation, the air path from the fan to the exhaust port 24 is longer than in the normal ventilation operation performed using the ventilation fan 50, and Due to differences in the size and structure of the blower itself, there is a possibility that the amount of ventilation will be insufficient. Therefore, by performing ventilation by rotating the circulation fan 40 at a rotation speed equal to or higher than the maximum rotation speed during normal operation, it is possible to compensate for the shortage of the ventilation amount described above.

In addition, when performing ventilation only with the circulation fan 40 in the circulation fan single operation, the control unit 70 does not rotate the circulation fan 40 at a rotation speed equal to or higher than the maximum rotation speed during normal operation from the beginning. The rotation speed of the circulation fan 40 may be increased when an instruction to increase the rotation speed is received.

Embodiment 4.
Next, Embodiment 4 will be described. Note that descriptions of the same portions of the present embodiment as those of the above-described embodiment will be omitted.

In the present embodiment, unlike the third embodiment, in the circulation fan single operation (step S04) performed when an abnormality in ventilation fan 50 is detected but not in circulation fan 40, the ventilation operation is stopped. When there is an operation instruction (step S41) and the circulation fan 40 is to be driven (step S43), the controller 70 adjusts the rotation speed of the circulation fan 40 to the pressure loss of the air passage through which the air sucked into the circulation fan 40 flows. control based on

In general, pressure loss varies depending on conditions such as the shape and length of air passages. For example, when the bathroom dryer 1 ventilates the dressing room 4, the air in the dressing room 4 is sucked in through the suction port 8 and the ventilation duct 9, and the air in the dressing room 4 is sucked through the door 6 through the door 6 and the bathroom 2. Inhale the air inside. At this time, the magnitude of the pressure loss varies depending on the shape, length, etc. of these air passages. Further, the bathroom dryer 1 discharges the air sucked through the exhaust duct 10 to the outside, but at this time, the magnitude of the pressure loss changes depending on the shape, length, etc. of the exhaust duct 10 .

In this embodiment, when normal ventilation operation is performed, that is, when both the ventilation fan 50 and the circulation fan 40 are normal, the air in the dressing room 4 flows through the suction port 8 and the ventilation duct 9 into the bathroom dryer. The air is sucked into the bathroom dryer 1 together with the air in the bathroom 2 through the louver 7 of the door 6. - 特許庁On the other hand, when an abnormality of ventilation fan 50 is detected and ventilation operation is instructed in single operation of circulation fan, air is sucked by circulation fan 40, so air in dressing room 4 flows from door 6 to bathroom 2. Although it is sucked into the bathroom dryer 1 through the air, it is not sucked through the suction port 8 and the ventilation duct 9. As a result, the air in the dressing room 4 is sucked only through the air passage passing through the door 6, resulting in a large pressure loss. In order to ensure a predetermined amount of ventilation under such an environment, it is conceivable to increase the rotation speed of the circulation fan 40 . However, simply increasing the rotation speed of the circulation fan 40 increases the power consumption, and furthermore, the rotation sound of the circulation fan 40 becomes louder, resulting in noise, which may impair the user's comfort.

Therefore, in the present embodiment, control unit 70 controls the rotation speed of circulation fan 40 based on the pressure loss in the air passage through which the air sucked into circulation fan 40 flows. As for the air passage through which the air sucked into the circulation fan 40 flows, for example, when the ventilation operation is performed in the single operation of the circulation fan as described above, the door 6 from the dressing room 4, the bathroom 2, the bathroom dryer 1 bathroom suction port 21, circulating air passage 25, ventilation connection port 27, ventilation air passage 26, exhaust port 24 and exhaust duct 10 are used as an air passage to the outside. For example, when the pressure loss in the air passage becomes large and the amount of ventilation is insufficient, the control unit 70 increases the rotation speed of the circulation fan 40, or the pressure loss is not large and the circulation fan 40 rotates more than necessary. If so, the rotation speed of circulation fan 40 is suppressed. In this way, by controlling the circulation fan 40 at the optimum rotation speed based on the pressure loss and performing ventilation, the operation of the circulation fan 40 at a rotation speed higher than necessary is avoided, and power consumption and noise are reduced. can be realized.

For example, the pressure loss in the air passage when the ventilation operation is performed in the single operation of the circulation fan can be set in advance in the control unit 70 . Specifically, when a contractor or the like installs the bathroom dryer 1 in a house or the like, the pressure loss is obtained from the actual construction situation, and the value of the pressure loss is set in the control unit 70 using the operation unit 80. do. Alternatively, the pressure loss in the air passage may be estimated by performing a ventilation operation in which only the circulation fan 40 is driven in advance. As a method of estimating the pressure loss, for example, a DC motor (direct current motor) is used for the circulation fan motor 42 of the circulation fan 40, and the air volume is proportional to the first power of the rotation speed and the current value is proportional to the square of the rotation speed. Using the characteristics of driving a blower with a DC motor, such as a proportional relationship, the rotation speed and current value of the DC motor during ventilation operation, the rotation speed and current value during normal operation, or before product shipment The pressure loss can be estimated by setting a reference rotational speed, current value, etc., in advance and comparing the set rotational speed, current value, and the like. The timing for estimating the pressure loss may be any timing, for example, when the bathroom dryer 1 is initially energized, every time a certain period of time elapses, or when an instruction is given from the operation unit 80 .

The pressure loss may be estimated by using a DC motor for the ventilation fan motor 52 of the ventilation fan 50 and performing a ventilation operation in which only the ventilation fan 50 is driven. In this case, the ventilation operation is performed with the ventilation suction port 23 closed by the backflow prevention means 33 described in the second embodiment.

It should be noted that appropriate combinations, modifications, and omissions of the embodiments are also included within the scope of the technical ideas shown in the embodiments.

1, 101 bathroom dryer, 2 bathroom, 3 bathtub, 4 dressing room, 5 washstand, 6 door, 7 louver, 8 suction port, 9 ventilation duct, 10 exhaust duct, 20 main body, 21 bathroom suction port, 22 bathroom Air outlet 23 Ventilation suction port 24 Exhaust port 25 Circulating air passage 26 Ventilation air passage 27 Ventilation connection port 28 Ventilation chamber 29 Dust collection filter 30 Design panel 31 Heating unit 33 Backflow prevention means 34 Open/close damper 35 Rotating shaft 40 Circulation fan 41 Circulation fan 42 Circulation fan motor 43, 53 Revolution sensor 50 Ventilation fan 51 Ventilation fan 52 Ventilation fan motor 60 Air path switching means 61 Rotating damper 62 damper rotation shaft, 70 control unit, 71 processor, 72 memory, 80 operation unit, 90 notification unit.

Claims (4)

A bathroom air inlet for sucking air from the bathroom, a bathroom air outlet for blowing the sucked air into the bathroom, a ventilation inlet for sucking air from other rooms other than the bathroom, and the sucked air An exhaust port for discharging to the outdoors, a circulating air passage from the bathroom air inlet to the bathroom air outlet, and a ventilation connection port that communicates with the circulating air passage to the exhaust port and communicates with the ventilation inlet. a main body provided with a ventilation air passage;
a circulation fan disposed in the circulation air passage, sucking air from the bathroom air inlet and sending the air to at least one of the bathroom air outlet and the ventilation connection;
a ventilation blower disposed in the ventilation air passage, sucking air from the ventilation connection port and the ventilation suction port and sending the air to the exhaust port;
A first state in which the ventilation connection port is opened and the downstream side of the circulation air passage to the bathroom outlet is closed, and a second state in which the ventilation connection port is closed and the downstream side of the circulation air passage is opened. air path switching means for switching between the state of
a control unit that controls operations of the circulation fan, the ventilation fan, and the air path switching means;
with
The control unit
Determining whether or not an abnormality of the ventilation fan and whether or not an abnormality of the circulation fan is detected,
If an abnormality of the ventilation fan is detected and an abnormality of the circulation fan is not detected, and if there is an instruction to operate the ventilation fan to exhaust the air in the bathroom and the other room to the outside by driving the ventilation fan, the above stopping the ventilation fan and driving the circulation fan in the first state ;
The circulation fan is driven when an abnormality of the ventilation fan and the circulation fan is not detected and neither of the ventilation fan and the circulation fan is detected to be abnormal when the ventilation operation is instructed. Driving the circulation fan at a rotation speed equal to or higher than the largest rotation speed among the rotation speeds of
A bathroom dryer characterized by: 2. The bathroom dryer according to claim 1, further comprising backflow prevention means for preventing backflow of air sucked through said bathroom suction port from said ventilation suction port to said other room. 3. The bathroom dryer according to claim 2 , wherein said backflow prevention means is a damper for opening and closing said ventilation suction port. A bathroom air inlet for sucking air from the bathroom, a bathroom air outlet for blowing the sucked air into the bathroom, a ventilation inlet for sucking air from other rooms other than the bathroom, and the sucked air An exhaust port for discharging to the outdoors, a circulating air passage from the bathroom air inlet to the bathroom air outlet, and a ventilation connection port that communicates with the circulating air passage to the exhaust port and communicates with the ventilation inlet. a main body provided with a ventilation air passage; a circulation fan disposed in the circulation air passage to suck air from the bathroom suction port and send the air to at least one of the bathroom air outlet and the ventilation connection port; a ventilation blower arranged in an air passage to draw in air from the ventilation connection port and the ventilation suction port and send the air to the exhaust port; and a second state in which the ventilation connection port is closed and the downstream side of the circulation air passage is opened, the circulation fan, the ventilation fan, and the A control method for a bathroom dryer, comprising:
a step of determining whether the control unit has detected an abnormality in the ventilation fan;
a step of determining whether or not the control unit has detected an abnormality in the circulation fan;
determining whether or not there is an instruction for a ventilation operation in which the control unit drives the ventilation blower to exhaust the air in the bathroom and the other room to the outside;
When the controller detects an abnormality in the ventilation fan but does not detect an abnormality in the circulation fan and when the ventilation operation is instructed, the control unit stops the ventilation fan and switches the air path switching means to the second 1, and drives the circulation fan at a rotation speed equal to or higher than the largest rotation speed among the rotation speeds of the circulation fan that are driven when neither the ventilation fan nor the circulation fan detects an abnormality. a step;
A control method for a bathroom dryer, comprising:

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