ventilation equipment

Abstract

To provide a ventilation device reducing uncomfortable feeling a user who enters a living room space feels by inhaling gas having a deodorization function, while suppressing smell from remaining in the living room space using air containing gas having the deodorization function.SOLUTION: A ventilation device includes: a box having a living room space, a ventilation passage, an air supply port and an exhaust port; a blower; a deodorization gas generating part; an exhaust air passage; a circulating air passage; a damper adjusting opening ratios of the exhaust air passage and the circulating air passage; a human sensor detecting presence or absence of a person in the living room space; and a controller controlling actions of the blower, the deodorization gas generating part, the damper and the human sensor. The controller executes a ventilation mode including an action for controlling the blower by a first output, an action for stopping the operation of the deodorization gas generating part and an action for making the exhaust air passage an open state and also making the circulating air passage a closed state via the damper, when it is determined that a detection result of the human sensor shows a presence state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a ventilation device that has a living space and is capable of ventilating the living space. [Background technology]

[0002] Patent Document 1 discloses a booth with a ventilation function that can quickly ventilate the room by sucking in the air from a wide surface and discharging it.

[0003] This booth has at least one of the side panels that close the four sides (front, back, left, and right) having a double inner and outer structure with an inner panel and an outer panel that are spaced apart from each other, and the interior of these panels forms an air passage facing up and down. This air passage is divided into upper and lower sections at a specified height so that the lower section serves as an air supply passage and the upper section serves as an exhaust passage. An air outlet is provided at the bottom of the inner panel to supply air introduced into the air supply passage into the booth room, while a number of intake holes that communicate with the exhaust passage are provided in the inner panel above the partition, and the upper section of the exhaust passage is connected to an exhaust unit. By doing this, the air introduced into the air supply passage flows into the booth room via the air outlet, and the air inside the booth room is sucked into the exhaust passage via the intake holes and discharged to the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-349246 Summary of the Invention [Problem to be solved by the invention]

[0005] The booth disclosed in Patent Document 1 had a problem in that odor components adhering to the interior of the booth left an odor remaining within the booth, and the remaining odor caused discomfort to users who entered the booth.

[0006] The present disclosure is intended to solve the above-mentioned problems, and provides a ventilation device that uses air containing gas with deodorizing properties to prevent odors from remaining in a living space, and also reduces the discomfort felt by users who enter the living space by inhaling the gas with deodorizing properties. [Means for solving the problem]

[0007] The ventilation device of the present disclosure comprises a living space, a box having an air duct communicating with the living space, an air intake port for supplying air to the living space, and an air exhaust port for exhausting air from the living space, a blower that generates an air current that is blown from the air intake port through the air duct into the living space, a deodorizing gas generation unit that mixes a gas having deodorizing function into the air current, an exhaust air duct that guides the air current blown into the living space to the exhaust port, a circulation air duct that guides the air current blown into the living space through the ventilation duct to the living space, a damper that adjusts the opening rate of the exhaust air duct and the circulation air duct, a human presence sensor that detects the presence or absence of people in the living space, and a controller that controls the operation of the blower, the deodorizing gas generation unit, the damper, and the human presence sensor. When the controller determines that the detection result of the human presence sensor indicates a presence state, it executes a ventilation mode including the operations of controlling the blower at a first output, stopping the operation of the deodorizing gas generation unit, and opening the exhaust air duct and closing the circulation air duct via a damper. [Effects of the Invention]

[0008] The ventilation device of the present disclosure deodorizes a living space by circulating air containing a gas having a deodorizing function in the living space only when the living space is unoccupied, thereby suppressing odors from remaining in the living space and reducing the discomfort felt by users who enter the living space by inhaling the gas having a deodorizing function. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view schematically showing the configuration of the ventilation device according to the first embodiment. [Figure 2]FIG. 2 is a top view schematically showing the configuration of the ventilation device in the first embodiment with the exhaust air passage in an open state and the circulation air passage in a closed state. [Figure 3] FIG. 3 is a top view schematically showing the configuration of the ventilation device in the first embodiment with the exhaust air passage in a closed state and the circulation air passage in an open state. [Figure 4] FIG. 4 is a schematic block diagram showing the configuration of the controller according to the first embodiment. [Figure 5] FIG. 5 is a flowchart showing an example of the operation of the ventilation device according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the first embodiment will be described with reference to the drawings. However, in some cases, more detailed explanation than necessary will be omitted. For example, detailed explanation of already well-known matters or redundant explanation of substantially the same configuration will be omitted. This is to avoid the following explanation from being unnecessarily redundant and to make it easier for those skilled in the art to understand.

[0011] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0012] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to FIGS.

[0013] [1-1.Configuration] Ventilation device 100 is installed in an indoor space such as an office. In Figures 1 to 3, ventilation device 100 includes box 110, blower 120, deodorizing gas generation unit 130, exhaust air duct 140, circulating air duct 150, damper 160, human presence sensor 170, and controller 180.

[0014] Box 110 is a rectangular housing and has living space 111 , ventilation passage 112 , air intake port 113 , and exhaust port 114 .

[0015] The living space 111 is a space where users can enter, exit, and stay in. The living space 111 is formed by a floorboard 111a, a side panel 111b, and a top board 111c.

[0016] The floorboard 111a is a rectangular board placed on the floor surface side in an indoor space.

[0017] The side panels 111b are erected from the outer peripheral edge of the floor board 111a and are provided with four rectangular plate members.

[0018] The top board 111c is a rectangular plate member that covers the opening formed by the side panels 111b standing upright. The top board 111c is provided above the floor board 111a.

[0019] Chairs 200 and desks 300 are placed in the living space 111. The chairs 200 and desks 300 will be described later.

[0020] Ventilation passage 112 is a ventilation pipe that communicates with living space 111 and guides air drawn in through air intake port 113 to living space 111. Ventilation passage 112 stands upright from floorboard 111a toward top board 111c. One end opening of ventilation passage 112 connects to living space 111 on the floorboard 111a side from the center between floorboard 111a and top board 111c. The other end opening of ventilation passage 112 connects to living space 111 on the top board 111c side from the center between floorboard 111a and top board 111c.

[0021] Air intake port 113 is a square opening provided in floorboard 111a for supplying air to living space 111. Air intake port 113 communicates between living space 111 and an indoor space (a space external to living space 111) in which ventilation device 100 is placed.

[0022] The exhaust port 114 is a square opening provided in the floorboard 111a for discharging air from the living space 111. The exhaust port 114 connects the living space 111 with an indoor space (an external space relative to the living space 111) in which the ventilation device 100 is placed.

[0023] The blower 120 generates an airflow AF1 that is blown out from the air intake port 113 through the ventilation passage 112 into the living space 111. The blower 120 is disposed on the floorboard 111a. The blower 120 may be a turbo machine such as a centrifugal blower.

[0024] The deodorizing gas generator 130 mixes gas with deodorizing properties into the airflow AF1. Here, deodorization refers to a technology that reduces unpleasant odors to an odorless or low odor level. There are four principles of deodorizing technology: removal by physical adsorption, removal by chemical reaction, biological decomposition, and masking by aromatic substances. The gas mixed into the airflow AF1 by the deodorizing gas generator 130 is based on one of the four principles or a combination of multiple principles. The deodorizing gas generator 130 is placed on the floorboard 111a.

[0025] Exhaust airflow path 140 is a ventilation path for guiding air (airflow AF1) blown out into living space 111 to exhaust port 114. A part of exhaust airflow path 140 is formed by chair 200.

[0026] Circulation airflow path 150 is an airflow path for guiding air (airflow AF1) blown out into living space 111 back into living space 111 via ventilation path 112. A part of circulation airflow path 150 is formed by chair 200.

[0027] Damper 160 adjusts the opening ratio of exhaust air duct 140 and circulation air duct 150. When the opening ratio of exhaust air duct 140 is 100% (fully open), damper 160 sets the opening ratio of circulation air duct 150 to 0% (fully closed). When the opening ratio of exhaust air duct 140 is 50%, damper 160 sets the opening ratio of circulation air duct 150 to 50%. Damper 160 is a member for opening and closing exhaust air duct 140 and circulation air duct 150, and more specifically, is connected to a motor (not shown) that moves damper 160. A known technology is used for the mechanism for moving damper 160 using the motor. Damper 160 is provided on chair 200.

[0028] The human presence sensor 170 detects the presence or absence of a person in the living space 111. The human presence sensor 170 employs a known detection technology such as infrared technology. The human presence sensor 170 is disposed below the desk 300, on the side panel 111b. The human presence sensor 170 is disposed opposite the chair 200.

[0029] The controller 180 comprehensively controls the operations of the blower 120, the deodorizing gas generation unit 130, the damper 160, and the human presence sensor 170. The controller 180 is electrically connected to the blower 120, the deodorizing gas generation unit 130, the damper 160, and the human presence sensor 170 so as to be able to communicate electrically with them.

[0030] The controller 180 in the present disclosure may be any device capable of controlling the device in the present disclosure. The controller 180 can be realized in various ways. For example, a processor may be used as the controller 180. If a processor is used as the controller 180, various processes can be performed by loading a program from a storage medium storing the program into the processor and executing the program by the processor. Therefore, the process content can be changed by changing the program stored in the storage medium, thereby increasing the degree of freedom in changing the control content. Examples of the processor include a CPU (Central Processing Unit) and an MPU (Micro-Processing Unit). Examples of the storage medium include a hard disk, a flash memory, and an optical disk.

[0031] The controller 180 is disposed on the floorboard 111a in an air passage through which the airflow AF1 passes. In Fig. 4, the controller 180 includes a first operation control unit 181, a second operation control unit 182, a third operation control unit 183, a detection result receiving unit 184, and a processing unit 185.

[0032] First operation control unit 181 controls the operation of blower 120 based on information output from processing unit 185. The information output from processing unit 185 is information related to the operation output of blower 120.

[0033] The second operation control unit 182 controls the operation of the deodorizing gas generation unit 130 based on the information output from the processing unit 185. The information output from the processing unit 185 is information related to the operation ON / OFF of the deodorizing gas generation unit 130.

[0034] The third operation control unit 183 controls the operation of the motor connected to the damper 160 based on the information output from the processing unit 185. The information output from the processing unit 185 is information related to the rotation angle of the motor connected to the damper 160.

[0035] The detection result receiving unit 184 receives information relating to the detection result of the human presence sensor 170 as to whether or not a person is present in the living space 111 .

[0036] The processing unit 185 performs processing based on the information received by the detection result receiving unit 184, and outputs the processing results to one or more of the first operation control unit 181, the second operation control unit 182, and the third operation control unit 183.

[0037] Chair 200 is seated by a user staying in living space 111. Chair 200 abuts against side panel 111b on the side where ventilation duct 112 is arranged, and is positioned opposite human sensor 170. Chair 200 has hollow space 201, in which blower 120, deodorizing gas generation unit 130, and controller 180 are arranged. Chair 200 forms part of exhaust air duct 140 and circulation air duct 150.

[0038] Desk 300 is a tool on which a user staying in living space 111 can place a personal computer, documents, etc. and work. Desk 300 is provided on side panel 111b opposite side panel 111b against which chair 200 abuts. Desk 300 is placed above human sensor 170.

[0039] [1-2. Operation] An example of the operation of the ventilation device 100 will be described with reference to Fig. 5. The operation of the ventilation device 100 is started when power is supplied to the ventilation device 100, when the user instructs the controller 180 to start operation via a remote controller (not shown), or the like.

[0040] (Step S1) In step S1, the controller 180 receives the detection result of the human presence sensor 170 via the detection result receiving unit 184 and determines whether the occupancy state or absence state of the living space 111 is present. If the controller 180 determines that the detection result of the human presence sensor 170 is an absence state (NO in step S1), the controller 180 repeats step S1. Note that while the ventilation device 100 is operating, the human presence sensor 170 continues to detect whether the occupancy state or absence state of the living space 111 is present. If the controller 180 determines that the detection result of the human presence sensor 170 is an absence state (YES in step S1), the controller 180 executes step S2.

[0041] (Step S2) In step S2, the controller 180 executes the ventilation mode. In the ventilation mode, the controller 180 controls the blower 120 with the first output W1 via the first operation control unit 181. In the ventilation mode, the controller 180 stops the operation of the deodorizing gas generation unit 130 via the second operation control unit 182. In the ventilation mode, the controller 180 controls the operation of the damper 160 via the third operation control unit 183 to open the exhaust air passage 140 and close the circulation air passage 150. When the ventilation mode is executed, air drawn in from the air supply port 113 is generated as an airflow AF1 that is blown into the living space 111 via the ventilation passage 112. The air (airflow AF1) blown into the living space 111 is exhausted to the outside of the living space 111 from the exhaust port 114 via the exhaust air passage 140. The ventilation mode executes ventilation of the air in the living space 111. After executing step S2 (ventilation mode), the controller 180 executes step S3.

[0042] (Step S3) In step S3, the controller 180 receives the detection result of the human presence sensor 170 via the detection result receiving unit 184 and determines whether the living space 111 has switched from a presence state to an absence state. If the controller 180 determines that the detection result of the human presence sensor 170 remains in the presence state (NO in step S3), the controller 180 repeats step S3 while continuing the ventilation mode. If the controller 180 determines that the detection result of the human presence sensor 170 has switched from the presence state to the absence state (YES in step S3), the controller 180 executes step S4.

[0043] (Step S4) In step S4, the controller 180 stops the ventilation mode and executes the circulation mode. In the circulation mode, the controller 180 controls the blower 120 with a first output W1 via the first operation control unit 181. In the circulation mode, the controller 180 starts the operation of the deodorizing gas generation unit 130 via the second operation control unit 182. In the ventilation mode, the controller 180 controls the operation of the damper 160 via the third operation control unit 183 to close the exhaust airflow 140 and open the circulation airflow 150. When the circulation mode is executed, air drawn in from the air supply port 113 is generated through the ventilation path 112 to generate an airflow AF1 that is blown into the living space 111. The airflow AF1 is blown into the living space 111 while containing the gas having a deodorizing function generated by the deodorizing gas generation unit 130. The air (airflow AF1) blown into living space 111 becomes a circulating airflow that is blown again into living space 111 from circulating air duct 150 through ventilation duct 112. The airflow going from circulating air duct 150 to ventilation duct 112 contains gas generated by deodorizing gas generation unit 130. In the circulation mode, the opening that connects living space 111 to the space outside living space 111 is air intake port 113. Since air is drawn in from air intake port 113 by operation of blower 120, living space 111 becomes a state of positive pressure relative to the space outside. Therefore, the circulation mode prevents the circulating airflow from being blown out from air intake port 113 to the space outside. The circulation mode circulates the air in living space 111. After executing step S4 (circulation mode), controller 180 executes step S5.

[0044] (Step S5) In step S5, the controller 180 determines whether a predetermined time T (e.g., 5 minutes) has elapsed since the detection result of the human presence sensor 170 became an absent state. If the controller 180 determines that the detection result of the human presence sensor 170 has switched from an absent state to a present state within the predetermined time T (NO in step S5), the controller 180 executes step S6. If the controller 180 determines that the predetermined time T has elapsed since the detection result of the human presence sensor 170 became an absent state (YES in step S5), the controller 180 executes step S7.

[0045] (Step S6) In step S6, the controller 180 stops the execution of the circulation mode and executes the ventilation mode, and then returns to step S3.

[0046] (Step S7) In step S7, the controller 180 stops the circulation mode and starts the rapid ventilation mode. In the rapid ventilation mode, the controller 180 controls the blower 120 via the first operation control unit 181 to a second output W2 greater than the first output W1. In the rapid ventilation mode, the controller 180 stops the operation of the deodorizing gas generation unit 130 via the second operation control unit 182. In the rapid ventilation mode, the controller 180 controls the operation of the damper 160 via the third operation control unit 183 to open the exhaust air duct 140 and close the circulation air duct 150. When the rapid ventilation mode is started, the airflow containing the gas having the deodorizing function is exhausted from the exhaust air duct 140 to the outside of the living space 111 through the exhaust port 114. The air drawn in through the air intake port 113 is blown into the living space 111 via the ventilation path 112. In the rapid ventilation mode, the ventilation volume is increased compared to the ventilation mode, and the living space 111 is ventilated.

[0047] [1-3. Effects, etc.] The ventilation device 100 includes a box 110 having a living space 111, an air passage 112 communicating with the living space 111, an air intake port 113 for supplying air to the living space 111, and an exhaust port 114 for discharging air from the living space 111, a blower 120 for generating an air current that is blown from the air intake port 113 through the air passage 112 into the living space 111, a deodorizing gas generator 130 for mixing a gas having a deodorizing function into the air current, and a deodorizing gas generator 130 for mixing the air current with a gas having a deodorizing function. The air conditioner includes an exhaust air duct 140 that guides the airflow blown into living space 111 to exhaust port 114, a circulation air duct 150 that guides the airflow blown into living space 111 to living space 111 via ventilation duct 112, a damper 160 that adjusts the opening ratio of exhaust air duct 140 and circulation air duct 150, a human presence sensor 170 that detects the presence or absence of a person in living space 111, and a controller 180 that controls the operation of blower 120, deodorizing gas generation unit 130, damper 160, and human presence sensor 170. When controller 180 determines that the detection result of human presence sensor 170 indicates a presence state, it executes a ventilation mode that includes an operation of controlling blower 120 with a first output W1, an operation of stopping the operation of deodorizing gas generation unit 130, and an operation of opening exhaust air duct 140 and closing circulation air duct 150 via damper 160.

[0048] As a result, only when the living space 111 is unoccupied, the ventilation device 100 deodorizes the living space 111 while circulating air containing the gas having a deodorizing function in the living space 111. This makes it possible to suppress odors from remaining in the living space 111, while reducing the possibility that a user who enters the living space 111 will feel uncomfortable by inhaling the gas having a deodorizing function.

[0049] When the controller 180 determines that the detection result of the human presence sensor 170 has switched from a presence state to an absence state, it stops the execution of the ventilation mode and executes a circulation mode including the operation of controlling the blower 120 with the first output W1, the operation of starting the operation of the deodorizing gas generation unit 130, and the operation of closing the exhaust air duct 140 and opening the circulation air duct 150 via the damper 160.

[0050] As a result, ventilation device 100 circulates an airflow containing a gas having deodorizing function within living space 111 after the user has left living space 111. When an airflow containing a gas having deodorizing function is circulated within living space 111, the deodorizing effect on odor components adhering to living space 111 can be enhanced compared to when an airflow containing a gas having deodorizing function is exhausted from living space 111. Therefore, odors are prevented from remaining in living space 111.

[0051] When the controller 180 determines that the detection result of the human presence sensor 170 has switched from an unoccupied state to a present state within the predetermined time T, the controller 180 stops the execution of the circulation mode and executes the ventilation mode.

[0052] As a result, if a user enters living space 111 while the circulation mode is running, the ventilation mode can exhaust the gas having deodorizing properties from living space 111. Therefore, compared to when the circulation mode is continuously running, the amount of air containing the gas having deodorizing properties that the user inhales can be reduced, and the discomfort felt by inhaling air containing the gas having deodorizing properties can be suppressed.

[0053] When the controller 180 determines that the unoccupied state has elapsed for a predetermined time T, it stops the execution of the circulation mode and executes a rapid ventilation mode including the operation of controlling the blower 120 at a second output W2 greater than the first output W1, the operation of stopping the operation of the deodorizing gas generation unit 130, and the operation of opening the exhaust air duct 140 and closing the circulation air duct 150 via the damper 160.

[0054] As a result, the ventilation device 100 ventilates the air in the living space 111 in a shorter time than in the ventilation mode by increasing the ventilation volume compared to the ventilation mode. When the execution of the circulation mode is completed at the predetermined time T, the ventilation device 100 exhausts the air containing the gas having a deodorizing function to the outside of the living space 111 in a shorter time than in the ventilation mode. Therefore, the amount of air containing the gas having a deodorizing function that the user inhales is reduced, and the discomfort felt by inhaling air containing the gas having a deodorizing function can be suppressed.

[0055] (Variation) Below, we will explain modifications of embodiment 1. In the explanation of the modifications, the same components and members as those in the embodiment will be given the same reference numerals. We will omit explanations that overlap with the embodiment as appropriate, and will focus on the configurations that differ from the example.

[0056] The ventilation device 100 may be a stationary type, or may be a portable type provided with casters or other moving parts on the floor board 111a.

[0057] Although the air intake port 113 is rectangular, it is not limited to this shape and may be a polygon other than a rectangle or a circle.

[0058] Although the exhaust port 114 is rectangular, it is not limited to this shape and may be a polygon other than a rectangle or a circle.

[0059] The ventilation device 100 may be provided with a filter for capturing dust and other foreign matter contained in the airflow AF1 on an air path through which the airflow AF1 passes. This makes it possible to provide air containing less dust and other foreign matter to the living space 111 than before passing through the filter.

[0060] If the ventilation device 100 includes a filter, the controller 180 may be disposed downstream of the filter. This can prevent foreign matter such as dust from accumulating on the controller 180. This can reduce the possibility of a tracking phenomenon occurring due to moisture and foreign matter such as dust accumulated on the controller 180.

[0061] In the ventilation mode, the operation control of the blower 120, the deodorizing gas generator 130, and the damper 160 may be started in any order, or may be started simultaneously for a plurality of them.

[0062] In the circulation mode, the operation control of the blower 120, the deodorizing gas generator 130, and the damper 160 may be started in any order, or may be started simultaneously for a plurality of them.

[0063] In the rapid ventilation mode, the operation control of the blower 120, the deodorizing gas generator 130, and the damper 160 may be started in any order, or may be started simultaneously for a plurality of them.

[0064] The exhaust airflow path 140 may be provided as a separate body from the chair 200.

[0065] The air circulation passage 150 may be provided as a separate body from the chair 200.

[0066] The damper 160 may be provided as a separate unit from the chair 200.

[0067] As described above, the first embodiment and the modified examples have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Furthermore, it is also possible to combine the components described in the first embodiment and the modified examples to create new embodiments. [Industrial Applicability]

[0068] The present disclosure is applicable to a ventilation system that includes a living space and in which odor components adhering to the living space may cause odors to remain in the living space. Specifically, the present disclosure is applicable to a sealed individual booth with a ventilation function. [Explanation of symbols]

[0069] 100 Ventilation Equipment 110 Box 111 Living space 111a Floorboard 111b Side Panel 111c Top Board 112 Ventilation duct 113 Air supply port 114 Exhaust port 120 Blower 130 Deodorizing gas generator 140 Exhaust air duct 150 Circulating air duct 160 Damper 170 Human Sensor 180 Controller 181 First operation control section 182 Second operation control section 183 Third operation control section 184 Detection result receiving unit 185 Processing section 200 chairs 300 desks

Claims

1. a box having a living space, a ventilation duct communicating with the living space, an air intake port for supplying air to the living space, and an exhaust port for discharging air from the living space; a blower that generates an air current that is blown from the air supply port through the ventilation passage into the living space; a deodorizing gas generating unit that mixes a gas having a deodorizing function with the airflow; an exhaust air duct that guides the airflow blown into the living space to the exhaust port; a circulation air duct that guides the airflow blown into the living space to the living space via the ventilation duct; a damper for adjusting the opening ratio of the exhaust air passage and the circulation air passage; a human presence sensor that detects the presence or absence of a person in the living space; a controller that controls the operations of the blower, the deodorizing gas generator, the damper, and the human sensor; Equipped with When the controller determines that the detection result of the human presence sensor indicates an unoccupied state, the controller operates the deodorizing gas generating unit, closes the exhaust air duct via the damper, and opens the circulation air duct; When the controller determines that the detection result of the human presence sensor indicates a presence state, the controller executes a ventilation mode including the operations of controlling the blower at a first output, stopping the operation of the deodorizing gas generation unit, and opening the exhaust air duct and closing the circulation air duct via the damper.

2. 2. The ventilation device according to claim 1, wherein when the controller determines that the detection result of the human presence sensor has switched from a presence state to an absence state, the controller stops the ventilation mode and executes a circulation mode including the operations of controlling the blower at the first output, starting the operation of the deodorizing gas generation unit, and closing the exhaust air duct and opening the circulation air duct via the damper.

3. The ventilation device according to claim 2, wherein the controller stops the circulation mode and executes the ventilation mode when it determines that the detection result of the human presence sensor has switched from the absent state to the present state within a predetermined time.

4. 4. The ventilation device according to claim 3, wherein the controller, when determining that the unoccupied state has continued for the predetermined time, stops the execution of the circulation mode and executes a rapid ventilation mode including the operations of controlling the blower at a second output greater than the first output, stopping the operation of the deodorizing gas generation unit, and opening the exhaust air duct and closing the circulation air duct via the damper.

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