Hot air fan

Abstract

To provide a warm air heater capable of reducing discomfort of a user.SOLUTION: A warm air heater includes an air blowing unit for generating an air flow, a heating unit capable of heating the air flow, a pollution detecting unit for detecting pollution of air, and a control unit for controlling air blowing operation and warm air operation. The control unit controls the air blowing unit so that the volume of the air flow is increased by a first amount when the pollution level is varied from a first level to a second level. A degree of pollution at the second level is higher than that at the first level. In the warm air operation, the heating unit is controlled so that the air flow is heated, and the air blowing unit is controlled so that the volume of the air flow is not varied or the volume of the air flow is varied by a second amount smaller than the first amount when the pollution level is varied from the first level to the second level.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a hot air fan. [Background technology]

[0002] A hot air blower according to the related art has an air purifier function. Specifically, the hot air blower detects air contamination using a contamination sensor and adjusts the airflow volume according to the detection result. As a result, the dust collection capacity of the blower is improved (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-153466 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the hot air pump according to the related art has a problem in that it can be uncomfortable for the user. Specifically, the hot air pump may increase the airflow rate while blowing out hot air during heating operation in order to increase dust collection capacity. In this case, if the hot air with a large airflow rate hits the user, the user feels that the temperature of the hot air is lower, even if the heater power (i.e., the amount of heat generated per unit time) is the same.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a hot air fan that can reduce discomfort felt by the user. [Means for solving the problem]

[0006] The present invention provides a hot air fan that includes a blower that generates an air flow, a heater that can heat the air flow, a contamination detector that detects contamination of the air, and a controller that controls an air blowing operation and a hot air operation. When the contamination level changes from a first level to a second level during the air blowing operation, the controller controls the blower to increase the airflow volume by a first amount. The second level has more contamination than the first level. When the contamination level changes from the first level to the second level during the hot air operation, the controller controls the heater to heat the airflow, and when the contamination level changes from the first level to the second level, the controller controls the blower to not change the airflow volume or to change the airflow volume by a second amount that is less than the first amount. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a hot air fan that can reduce discomfort felt by the user. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the appearance of a hot air fan according to an embodiment of the present invention; [Figure 2] 2 is a block diagram illustrating the configuration of the hot air fan shown in FIG. 1. FIG. [Figure 3] 3 is a schematic diagram showing a data structure of an air volume table shown in FIG. 2. FIG. [Figure 4] 2 is a schematic diagram showing an operation display unit of the hot air blower shown in FIG. 1. FIG. [Figure 5] 3 is a flowchart showing a processing procedure of a control unit shown in FIG. 2. [Figure 6] FIG. 10 is a schematic diagram showing details of an operation display unit according to a first modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0010] [Embodiment] FIG. 1 is a perspective view showing the appearance of a hot air fan 1 according to an embodiment of the present invention. As shown in FIG. 1, the hot air fan 1 is installed in, for example, a room 41. In detail, the hot air fan 1 is, for example, a floor-standing type and is installed at a relatively low position such as on a floor 42. The hot air fan 1 draws in air from the room 41. The hot air fan 1 heats the drawn-in air and then blows it out as an air flow. The hot air fan 1 can also blow out the drawn-in air as an air flow without heating it.

[0011] The hot air fan 1 has a housing 11, an air inlet 12, an air outlet 13, a louver 14, and an operation display unit 15.

[0012] The housing 11 can have a variety of shapes. In the embodiment, the housing 11 is described as having a generally rectangular parallelepiped shape. Alternatively, the housing 11 can have a generally cylindrical shape. The housing 11 has a rear surface 11A, a front surface 11B, and a top surface 11C. The housing 11 has an air inlet 12 and an air outlet 13 on the rear surface 11A and the front surface 11B, respectively. The air outlet 13 is open toward the front of the housing 11. An air ventilation path A1 (see FIG. 2) extending from the air inlet 12 to the air outlet 13 is formed inside the housing 11.

[0013] The louvers 14 change the wind direction under the control of the control unit 111 (see FIG. 2). The wind direction is the direction of the airflow blown out from the air outlet 13. The wind direction can be changed between a first wind direction D01 and a second wind direction D02. The first wind direction D01 is a direction slightly diagonally downward in the horizontal direction D11 with respect to the representative position P01 of the air outlet 13. That is, the first wind direction D01 contains a large component in the horizontal direction D11 of the horizontal direction D11 and the vertical direction D12. The second wind direction D02 is a direction diagonally upward in the horizontal direction D11 with respect to the representative position P01. The second wind direction D02 contains a large component in the vertical direction D12 of the horizontal direction D11 and the vertical direction D12.

[0014] Fig. 2 is a block diagram showing an exemplary configuration of the hot air fan 1 shown in Fig. 1. As shown in Fig. 2, the hot air fan 1 includes an air blower 16, a heating unit 17, a dirt detection unit 18, a human detection unit 19, a control unit 111, and a memory unit 112.

[0015] The blower 16 and the heater 17 are each disposed on the ventilation path A1. The blower 16 is, for example, a fan. The heater 17 is, for example, a heater. The blower 16 and the heater 17 operate under the control of the controller 111. Specifically, the blower 16 generates an airflow in the ventilation path A1 that flows from the air inlet 12 toward the air outlet 13. That is, the blower 16 generates an airflow that is blown out from the air outlet 13. The heater 17 is capable of heating the airflow flowing in the ventilation path A1.

[0016] The dirt detection unit 18 is disposed in the housing 11 and detects air pollution in the room 41. The dirt detection unit 18 is realized, for example, by an optical sensor. The optical sensor has a light-emitting element and a light-receiving element disposed across a gap. The light-emitting element emits light toward the gap. The light is reflected by dirt (i.e., floating matter) in the gap and enters the light-receiving element. The light-receiving element outputs a signal indicating the amount of incident light to the control unit 111 as a dirt signal Sa indicating the air pollution.

[0017] The human detection unit 19 is disposed on the front surface 11B of the housing 11 (see FIG. 1) and is capable of detecting a person in front of the housing 11. The human detection unit 19 includes, for example, an infrared sensor and an image processing circuit. The infrared sensor acquires an infrared image. The image processing circuit detects from the infrared image whether or not a person is present in front of the housing 11, and outputs a signal Sb indicating the detection result to the control unit 111.

[0018] Furthermore, the person detection unit 19 may be, for example, a simple infrared sensor or distance measurement sensor without image processing capabilities. The simple infrared sensor or distance measurement sensor measures the distance to an object, detects whether the object is closer (a person is present) or farther (no person is present) than a predetermined distance, and outputs a signal Sb indicating the detection result to the control unit 111.

[0019] The temperature detection unit 110 is disposed in the housing 11 and detects the temperature inside the room 41. The temperature detection unit 110 is, for example, a thermocouple or a thermistor, and outputs a signal correlating with the detected temperature to the control unit 111 as a temperature signal Sc.

[0020] The control unit 111 is a central processing unit or a microcomputer. The storage unit 112 is, for example, a non-transitory computer-readable storage medium. In detail, the storage unit 112 includes a random access memory (RAM), a read-only memory (ROM), and / or a flash memory. The storage unit 112 stores a computer program 113, an air volume table 114, first mode information 115, and second mode information 116.

[0021] The control unit 111 executes a computer program 113 stored in the memory unit 112 to control the components of the hot air fan 1. When the computer program 113 is executed, the control unit 111 uses an air volume table 114, first mode information 115, and second mode information 116 to control an air blowing operation M1 and a hot air operation M2 as operation modes M.

[0022] Fig. 3 is a schematic diagram showing the data structure of the air volume table 114 shown in Fig. 2. As shown in Fig. 3, the air volume table 114 records air volumes F corresponding to contamination levels L and operation modes M.

[0023] The dirt level L indicates the level of dirt in the air in the room 41. The dirt includes dust such as pollen or PM (Particulate Matter) 2.5, and odors. In the embodiment, the dirt level L is divided into five levels, L1 to L5. The dirt levels L1 to L5 indicate increasing air pollution in the order of L1, L2, L3, L4, and L5. The dirt level L may be divided into levels other than five.

[0024] In the fan operation M1, which is one of the operation modes M, the heating unit 17 does not heat the airflow, and the fan unit 16 blows the airflow from the air outlet 13. The fan operation M1 also includes an automatic operation mode M11, a weak operation mode M12, and a strong operation mode M13.

[0025] The automatic operation mode M11, the weak operation mode M12, and the strong operation mode M13 can be designated by a user operation. In the automatic operation mode M11, air volumes F11 to F15 are predetermined corresponding to the contamination levels L1 to L5. The air volumes F11 to F15 increase in the order of, for example, F11, F12, F13, F14, and F15. That is, the dust collection capability (removal of air contamination) increases. In the automatic operation mode M11, the control unit 111 automatically determines the air volumes F11 to F15 based on the contamination levels L1 to L5. In the weak operation mode M12 and the strong operation mode M13, the air volumes F21 and F22 are predetermined, respectively, regardless of the contamination levels L1 to L5. The air volume F22 is greater than the air volume F21.

[0026] In the hot air operation M2, unlike the air blowing operation M1, the heating unit 17 heats the airflow while the air blowing unit 16 blows the airflow from the air outlet 13. The hot air operation M2 includes an automatic operation mode M21, a weak operation mode M22, and a strong operation mode M23. The automatic operation mode M21, the weak operation mode M22, and the strong operation mode M23 can be designated by a user operation.

[0027] In automatic operation mode M21, when the temperature inside room 41 is equal to or higher than the reference temperature, the airflow rate is predetermined to be F31 regardless of the contamination levels L1 to L5. In automatic operation mode M21, when the temperature inside room 41 is lower than the reference temperature, the airflow rate is predetermined to be F32 regardless of the contamination levels L1 to L5. Airflow rate F32 is greater than airflow rate F31. Note that airflow rate F32 may be equal to or less than airflow rate F31.

[0028] In the weak operation mode M22 and the strong operation mode M23, the air volumes F41 and F42 are respectively predetermined regardless of the contamination levels L1 to L5. The air volume F42 is larger than the air volume F41.

[0029] Referring again to Fig. 2, as shown in Fig. 2, the first mode information 115 indicates the operation mode M of the hot air fan 1. In detail, the first mode information 115 indicates either "fan operation M1" or "hot air operation M2" as the operation mode M. The second mode information 116 indicates either "automatic operation," "low operation," or "high operation."

[0030] Fig. 4 is a schematic diagram showing details of operation display unit 15 shown in Fig. 1. As shown in Fig. 4, operation display unit 15 is provided on top surface 11C (see Fig. 1) of housing 11. Operation display unit 15 accepts user operations and outputs commands indicating the operation details of hot air fan 1.

[0031] More specifically, the operation display unit 15 has various buttons for accepting user operations. The various buttons include a mode switching button 15A and an air volume switching button 15B. The air volume switching button 15B is an example of the "first operation unit" in the present invention. The operation display unit 15 may be substituted by remote operation from a mobile terminal such as a smartphone.

[0032] The mode switching button 15A is operated to change the operation mode M of the hot air fan 1. The mode switching button 15A outputs a command C11 indicating "mode switching" to the control unit 111 every time it is operated.

[0033] The air volume switching button 15B is operated to change the air volume. Each time the air volume switching button 15B is operated, a command C12 indicating "change air volume" as the operation content is output to the control unit 111. In the embodiment, each time the air volume switching button 15B is operated once, the air volume is cyclically switched between, for example, "automatic operation mode," "low operation mode," and "high operation mode."

[0034] The operation display unit 15 further has various lamps. The various lamps are light-emitting elements whose emission is controlled by the control unit 111. The various lamps include a hot air operation lamp 15C, a fan operation lamp 15D, an automatic operation lamp 15E, a low operation lamp 15F, and a high operation lamp 15G.

[0035] The hot air operation lamp 15C lights up during hot air operation M2. The fan operation lamp 15D lights up during fan operation M1. The automatic operation lamp 15E lights up during automatic operation mode. The weak operation lamp 15F lights up during "weak operation mode." The strong operation lamp 15G lights up during "strong operation mode."

[0036] The operation display unit 15 further has a temperature display unit 15H and a contamination level display unit 15J. The temperature display unit 15H displays the temperature indicated by the temperature signal Sc. The contamination level display unit 15J displays the contamination level based on the contamination signal Sa.

[0037] Fig. 5 is a flowchart showing the processing procedure of the control unit 111 shown in Fig. 2. As shown in Fig. 5, the control unit 111 executes the processing defined by steps S101 to S117.

[0038] In step S101, the control unit 111 determines whether or not the command C11 has been received from the mode switching button 15A. If it is determined in step S101 that the command C11 has not been received, the process proceeds to step S103. On the other hand, if it is determined in step S101 that the command C11 has been received, the process proceeds to step S102.

[0039] In step S102, control unit 111 updates first mode information 115 in storage unit 112. Specifically, if first mode information 115 indicates "fan blowing operation M1" immediately before step S102 is performed, control unit 111 updates the first mode information to "hot air operation M2." If first mode information 115 indicates "hot air operation M2" before step S102 is performed, control unit 111 updates the first mode information to "fan blowing operation M1." This causes the operation mode M to cyclically switch between "fan blowing operation M1" and "hot air operation M2." After step S102 is performed, the process proceeds to step S105.

[0040] Next, in step S103, control unit 111 determines whether command C12 has been received from air volume switching button 15B. If it is determined in step S103 that command C12 has not been received, the process proceeds to step S105. On the other hand, if it is determined in step S103 that command C12 has been received, the process proceeds to step S104.

[0041] In step S104, the control unit 111 updates the second mode information 116 in the storage unit 112. In particular, if the second mode information 116 indicates the "automatic operation mode," "low operation mode," or "high operation mode" immediately before step S104 is executed, the control unit 111 switches the second mode information 116 to the "low operation mode," "high operation mode," or "automatic operation mode." This causes the air volume from the hot air fan 1 to switch cyclically between the "automatic operation mode," "low operation mode," and "high operation mode." After step S104 is completed, the process proceeds to step S105.

[0042] In step S105, control unit 111 determines whether first mode information 115 currently indicates "fan operation M1" or "hot air operation M2." If "fan operation M1" is determined in step S105, the process proceeds to step S106. On the other hand, if "hot air operation M2" is determined in step S105, the process proceeds to step S112.

[0043] In step S106, the control unit 111 determines whether the second mode information 116 currently indicates the "automatic driving mode," the "low driving mode," or the "high driving mode."

[0044] In step S107, the control unit 111 acquires the dirt signal Sa from the dirt detection unit 18. The control unit 111 further determines which of the dirt levels L1 to L5 the dirt level indicated by the acquired dirt signal Sa is.

[0045] Next, in step S108, the temperature signal Sc is acquired from the temperature detection unit 110.

[0046] In FIG. 5, steps S106 to S108 do not have to be executed in the order of steps S106, S107, and S108.

[0047] Next, in step S109, the control unit 111 specifies, in the air volume table 114, the air volume F corresponding to the operation mode M (fan operation M1) determined in step S105, any one of the "automatic operation mode," "low operation mode," and "strong operation mode" determined in step S106, and the contamination level L determined in step S107. For example, if the "fan operation M1," "automatic operation mode," and "contamination level L1" are determined in steps S105, S106, and S107, respectively, the air volume is specified as F11 (see FIG. 3).

[0048] Next, in step S110, control unit 111 controls the rotation speed of blower unit 16 so that the airflow of air volume F determined in step S109 is blown out from air outlet 13. Control unit 111 also causes blower operation lamp 15D to emit light. Control unit 111 causes one of automatic operation lamp 15E, weak operation lamp 15F, and strong operation lamp 15G, whichever corresponds to the determination result in step S106, to emit light. Control unit 111 causes temperature display unit 15H to display the temperature indicated by temperature signal Sc. Control unit 111 causes contamination level display unit 15J to display the contamination level based on contamination signal Sa.

[0049] Next, in step S111, the control unit 111 waits for a predetermined time from the execution of step S109. After step S111 ends, the process returns to step S101. The predetermined time may be 0.

[0050] After transitioning to step S112, control unit 111 executes steps S112 to S114. Step S112 is the same process as step S106. Step S113 is the same process as step S107. Step S114 is the same process as step S108.

[0051] Next, in step S115, the control unit 111 determines whether the temperature signal Sc acquired in step S114 indicates a temperature equal to or higher than the reference temperature or lower than the reference temperature.

[0052] In FIG. 5, steps S112 to S114 do not have to be executed in the order of steps S112, S113, and S114.

[0053] Next, in step S115, control unit 111 identifies, in air volume table 114, the air volume F corresponding to operation mode M (hot air operation M2) determined in step S105, any one of "automatic operation mode," "low operation mode," and "high operation mode" determined in step S112, the contamination level L determined in step S113, and any one of "above reference temperature" and "below reference temperature" determined in step S114. For example, when "hot air operation M2," "automatic operation mode," "contamination level L2," and "above reference temperature" are determined in steps S105, S112, S113, and S114, respectively, air volume F31 is identified (see FIG. 3).

[0054] Next, in step S116, control unit 111 controls the rotation speed of blower unit 16 so that the airflow at airflow volume F determined in step S115 is blown out from outlet 13. Control unit 111 also controls the power supply to heating unit 17 so that warm air is blown out from outlet 13. When the airflow at airflow volume F is switched to a direction faster than the default, control unit 111 controls the orientation of louver 14 so that the direction of the warm air blown out from outlet 13 contains more vertical components than horizontal components. This makes it difficult for the warm air to hit the user, thereby reducing discomfort to the user. Control unit 111 also illuminates warm air operation lamp 15C. Control unit 111 illuminates one of automatic operation lamp 15E, low operation lamp 15F, and high operation lamp 15G that corresponds to the determination result in step S112. Control unit 111 also displays the temperature indicated by temperature signal Sc on temperature display unit 15H. The control unit 111 causes the dirt level display unit 15J to display the dirt level based on the dirt signal Sa.

[0055] Next, in step S117, the control unit 111 waits for a predetermined time from the execution of step S116. After step S117 ends, the process returns to step S101. The predetermined time may be 0.

[0056] 5, when the contamination level changes from the first level to the second level during fan operation M1, control unit 111 controls fan unit 16 to increase the airflow volume F by a first volume F. Here, the first volume is one of contamination levels L1 to L5, and the second volume is another of contamination levels L1 to L5. However, the second volume has more contamination than the first volume. For example, when the first volume is contamination level L1 and the second volume is contamination level L2, the first volume is equal to the value obtained by subtracting airflow volume F11 from airflow volume F12.

[0057] On the other hand, in hot air operation M2, control unit 111 controls heating unit 17 to heat the airflow, and does not change the airflow volume when the contamination level L changes from the first level to the second level. Alternatively, in hot air operation M2, control unit 111 may change the airflow volume of the airflow by a second amount that is less than the first amount when the contamination level L changes from the first level to the second level.

[0058] Therefore, while the hot air fan 1 is blowing out hot air from the outlet 13 during the hot air operation M2, the air volume F is not significantly changed to increase the dust collection capacity depending on the contamination level L. Therefore, the user does not feel that the temperature of the hot air has dropped. As a result, the hot air fan 1 prevents the user from feeling uncomfortable.

[0059] In hot air operation M2, the user can specify whether the hot air fan 1 is to operate in "weak operation mode" or "strong operation mode" using the air volume switch button 15B. In either "weak operation mode" or "strong operation mode," if the contamination level L changes from the first level to the second level, the control unit 111 controls the air blower 16 at the air volume specified using the air volume switch button 15B. As a result, hot air according to the user's preference is blown out from the hot air fan 1, preventing the user from feeling uncomfortable.

[0060] Next, a first modification of the embodiment will be described.

[0061] Fig. 6 is a schematic diagram showing details of the operation display unit 15 according to the first modified example. As shown in Fig. 6, the operation display unit 15 further includes an air volume change acceptance button 15K, as compared to the operation display unit 15 in the embodiment. The air volume change acceptance button 15K is a button that accepts a user operation to specify changing the air volume F according to the contamination level L in the hot air operation M2. The air volume change acceptance button 15K is an example of the "second operation unit" in the present invention.

[0062] When the air volume change acceptance button 15K is operated during hot air operation M2 and the contamination level L changes from the first level to the second level, the control unit 111 may change the air volume of the airflow by a third amount that is less than the second amount. According to the first modification, the air volume can be changed by a relatively large amount during hot air operation M2 by user operation, making it possible to provide a hot air fan 1 that is easy for the user to use.

[0063] Next, a second modification of the embodiment will be described.

[0064] 2, the control unit 111 can acquire a detection signal Sb from the human detection unit 19. When the control unit 111 acquires a detection signal Sb indicating the presence of a person during the warm air operation M2, and the contamination level L changes from the first level to the second level, the control unit 111 controls the blower unit 16 so that the airflow volume is not changed or is changed by only the second amount.

[0065] When the control unit 111 acquires a detection signal Sb indicating that no one is present during the warm air operation M2, and the contamination level L changes from the first level to the second level, the control unit 111 may control the blower unit 16 to increase the airflow rate by a third amount.

[0066] When no one is present in front of the air outlet 13 of the hot air fan 1, the control unit 111 controls the amount of airflow blown out from the air outlet 13 to be relatively large, thereby increasing the dust collection capacity.

[0067] The embodiments and modifications of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments and modifications, and can be embodied in various forms without departing from the spirit of the present invention. Furthermore, various inventions can be formed by appropriately combining multiple components disclosed in the above embodiments and modifications. For example, some components may be omitted from all components shown in the embodiments. Furthermore, components from different embodiments may be appropriately combined. The drawings mainly show each component in a schematic manner to facilitate understanding, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of drawing. Furthermore, the materials, shapes, dimensions, etc. of each component shown in the above embodiments are merely examples and are not particularly limited, and various modifications are possible within a range that does not substantially deviate from the configuration of the present invention.

[0068] (1) In the embodiment, the control unit 111 may restrict switching to the hot air operation M2. Specifically, the control unit 111 restricts execution of the automatic operation mode M21 in the hot air operation M2 unless a specific user operation is received on the operation display unit 15. Additionally, the control unit 111 may restrict transition from the hot air operation M2 to the automatic operation mode M11 of the air blowing operation M1. In other words, an airflow with an unexpected volume of air is prevented from being blown out from the air outlet 13. As a result, discomfort to the user is reduced. [Industrial Applicability]

[0069] The present invention provides a hot air blower and has industrial applicability. [Explanation of symbols]

[0070] 1. Hot air fan 11. Housing 12 Intake port 13 Air outlet 14 Louver 15 Operation display section 15A mode switch button 15B Air volume switch button 15K Air volume change acceptance button 16. Blower 17 Heating section 18 Dirt detection unit 19 Human detection unit 110 Temperature detection unit 111 Control Unit 112 Storage section 114: Air volume table 115: First mode information 116: Second mode information

Claims

1. a blower unit that generates an air flow; a heating unit capable of heating the air flow; a contamination detection unit that detects contamination of the air; a control unit that stops the heating unit and controls an air blowing operation to remove the contaminants from the air by operating the air blowing unit so that the air volume of the airflow is changed based on the detection result of the contaminant detection unit, and a hot air operation to remove the contaminants from the air by operating the air blowing unit and the heating unit; Equipped with The control unit In the air blowing operation, when the level of contamination changes from a first level to a second level, the air blower is controlled so that the air volume of the airflow increases by a first amount, and the second level is a level where the contamination is greater than that of the first level, In the hot air operation, the heating unit is controlled to heat the air flow, and when the level of contamination changes from the first level to the second level, the air volume of the air flow is not changed or the air volume of the air flow is changed by a second amount less than the first amount, and the hot air fan is controlled.

2. further comprising a first operation unit that accepts a user operation to specify an air volume; The hot air fan of claim 1, wherein when the level of dirt changes from the first level to the second level during the hot air operation, the control unit controls the blower unit at an air volume specified using the first operating unit.

3. a second operation unit that accepts a user operation to specify that the air volume be changed in accordance with the level of contamination during the hot air operation; 3. The hot air fan of claim 1, wherein when the second operating unit accepts user operation during the hot air operation, when the level of dirt changes from the first level to the second level, the control unit controls the blower unit to increase the air volume of the air flow by a third amount that is greater than the second amount.

4. Further comprising a person detection unit capable of detecting a person, The control unit In the warm air operation, when the presence of the person is detected by the person detection unit and the level of dirt changes from the first level to the second level, the blower unit is controlled so as not to change the air volume of the air flow or to change it by the second amount; 3. The hot air fan according to claim 1, wherein when the human detection unit detects that no person is present during the hot air operation and the level of dirt changes from the first level to the second level, the blower unit is controlled to increase the air volume of the air flow by a third amount greater than the second amount.

5. It is a floor-standing type, a housing having an outlet for the air flow; a louver capable of changing the direction of the airflow blown out from the air outlet; Equipped with The hot air fan according to claim 3 , wherein the control unit further controls the louvers during the hot air operation so that the air flow direction has more vertical components than horizontal components.

6. The hot air fan according to claim 1 or 2, wherein the control unit limits switching of the hot air operation.

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