Range hood

Abstract

To suitably detect gas generated in a non-cooking space except at the time of cooking.SOLUTION: A range hood 100 comprises: a hood part 91 generating an airflow by an operation of a fan 94, and having a suction opening 95 provided to suck air on a cooker; and a body part 92 having a discharge port 96 provided to discharge the sucked air. The range hood comprises a main flow path reaching to the fan from the suction opening in an airflow path, an auxiliary flow path reaching to the fan from a suction hole 11a formed on a face of the hood part different from the suction opening, and a detection part 10 arranged in the auxiliary flow path on an upper stream side than a confluence point of the main flow path and the auxiliary flow path, and detecting an air quality of air in the auxiliary flow path. The air flows into the main and auxiliary flow paths by an operation of the fan, and the detection part detects the air quality in the auxiliary flow path when the airflow is generated in the auxiliary flow path by the operation of the fan.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a range hood. [Background technology]

[0002] Conventionally, range hoods have been known that are equipped with sensors that detect miscellaneous gases and odors generated by cooking and control the volume of exhaust air based on the concentration detected by the sensors. For example, Patent Document 1 discloses a range hood that performs automatic ventilation operation by linking a gas cooking appliance with a range hood. This range hood is equipped with a gas sensor on the underside of the hood that detects the concentration of a specific type of gas contained in the gas flowing through the ventilation passage inside the casing arranged on the rear wall. The gas sensor is arranged facing the ventilation passage at a position that is retreated by a predetermined distance from the inner peripheral surface of the ventilation passage in order to suppress contamination of the detection unit of the gas sensor, and is configured to update the set air volume based on the detected gas concentration and the set air volume.

[0003] Furthermore, Patent Document 2 discloses a range hood that prevents forgetting to start or stop the exhaust fan and can effectively detect or discharge various gases, etc. This range hood includes a range hood body that defines an exhaust path, a main fan and a sub-fan that exhaust air through the exhaust path, and a gas sensor that is disposed on the outside of the front surface of the hood, and is configured to control at least the main fan and the sub-fan based on the output from the gas sensor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-020008 A [Patent Document 2] JP 2008-249321 A Summary of the Invention [Problem to be solved by the invention]

[0005] Although range hoods are suitable for exhausting gas due to their large exhaust volume, as in the above-mentioned patent document, they are intended for gas generated during cooking. Thus, although range hoods are essentially devices suitable for exhausting gas, they have never been provided for exhausting gas generated in non-cooking spaces other than cooking.

[0006] Therefore, the present invention provides a range hood that can suitably detect gas generated in a non-cooking space other than when cooking is being performed. [Means for solving the problem]

[0007] In order to solve the above problems, a range hood is provided which comprises a hood section having an intake opening for generating an airflow by operating a first blower to draw in air above a cooking appliance, and a main body section having an exhaust port for discharging the drawn-in air, wherein the range hood comprises a main flow path in the airflow path from the intake opening to the first blower, a sub-flow path from an air intake hole formed on a surface different from the intake opening of the hood section to the first blower, and a detection unit which is disposed in the sub-flow path upstream of the junction of the main flow path and the sub-flow path and detects the air quality of the air in the sub-flow path, wherein an airflow flows in the main flow path and the sub-flow path by operating the first blower, and the detection unit detects the air quality of the air in the sub-flow path when an airflow is generated in the sub-flow path by operating the first blower. This makes it possible to provide a range hood that can detect the air quality outside cooking or in non-cooking spaces by detecting the air quality in a secondary flow path that is sucked in through an intake hole formed on a surface different from the suction opening so that it is different from the main flow path through which oily smoke and other substances generated by cooking flow.

[0008] Furthermore, the main body may have a fan casing having a first blower therein, and a space inside the main body and outside the fan casing may be configured as a secondary flow path upstream of the junction. According to this, by configuring the large space inside the main body as a sub-flow path in which the detection unit is disposed, the detection unit can be flexibly configured, and space can be used effectively.

[0009] Furthermore, the fan casing may have suction ports on both sides of the rotation shaft of the first blower, the main flow path passing through the suction port on one side of the fan casing, and the secondary flow path passing through the suction port on the other side of the fan casing which has a smaller air intake volume than the one side. According to this, by providing an intake port on the back side of the blower as well, it is possible to easily ensure a secondary flow path by creating a negative pressure in the space inside the main body while ensuring a primary flow path.

[0010] Furthermore, the device may be characterized in that it is provided with a connecting duct that forms a secondary flow path connecting the detection unit and the intake hole, and the detection unit is located at a position vertically below the intake hole and a predetermined distance away in the direction of the junction. According to this, by providing a connecting duct that constitutes a sub-flow path, it is possible to separate the space between the intake hole and the detection unit, and the air taken in from outside the range hood can be immediately detected by the detection unit without being diluted with the air trapped in the range hood. Also, by locating the detection unit at a position vertically below the intake hole and spaced a certain distance in the direction of the junction, it is possible to protect the detection unit from liquid entering through the intake hole.

[0011] Furthermore, the air intake may be provided in the top plate of the hood portion and positioned outside the member covering the main body portion. According to this, the air intake hole is positioned on the top plate of the hood section, outside the member covering the main body section, so that it is positioned away from the airflow path to the suction opening of the hood section and it is possible to prevent the intake of air that is not from living space, such as the attic.

[0012] Furthermore, the air conditioner may further comprise a second fan that is disposed in the secondary flow passage upstream of the junction and that operates when the first fan is not operating. According to this, by further providing a second fan that is arranged in the sub-flow path and operates when the first fan is not operating, it is possible to detect the air quality even when cooking is not being performed. In addition, since the air during cooking is not sucked in, dirt and failure of the detection unit can be reduced.

[0013] In order to solve the above problems, a range hood is provided which comprises a hood section having an intake opening for generating an airflow by operating a first blower and drawing in air above a cooking appliance, and a main body section having an exhaust port for discharging the drawn-in air, the range hood comprising: an intake hole provided at a position in the flow path of the airflow generated by operation of the first blower that is a longer distance from the cooking appliance than the intake opening; an exhaust hole communicating with the intake hole; a main flow path from the intake opening to the exhaust port; a secondary flow path from the intake hole to the exhaust hole; a second blower which generates an airflow in the secondary flow path from the intake hole to the exhaust hole; and a detection section which detects the air quality of the air in the secondary flow path, wherein the detection section detects the air quality of the air in the secondary flow path when an airflow is generated in the secondary flow path by operation of the second blower. This makes it possible to provide a range hood that can detect the air quality outside cooking or in non-cooking spaces by detecting the air quality in a secondary flow path sucked in from an intake hole located away from the airflow flow path to the suction opening in the hood section for sucking in oily smoke and the like generated by cooking.

[0014] Furthermore, the air intake may be provided in the top plate of the hood portion and positioned outside the member covering the main body portion. According to this, the air intake hole is positioned on the top plate of the hood section, outside the member covering the main body section, so that it is positioned away from the airflow path to the suction opening of the hood section and it is possible to prevent the intake of air that is not from living space, such as the attic. Effect of the Invention

[0015] As described above, according to the present invention, it is possible to provide a range hood that can suitably detect gas generated in a non-cooking space other than when cooking is being performed. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram showing the interior of a house in which a range hood according to a first embodiment and a second embodiment of the present invention is installed. [Diagram 2] 1 is a perspective view of a range hood according to a first embodiment of the present invention with a front cover of a main body removed; [Diagram 3] 1 is a perspective view of a range hood according to a first embodiment of the present invention with a main body cover removed; [Figure 4] 1 is a perspective view of a range hood according to a first embodiment of the present invention with a fascia panel attached; [Diagram 5] 1A is a front view of a range hood according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line HH. [Figure 6] 1A is a front view of a range hood according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line JJ. [Figure 7] 1A is a front view of a range hood according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line KK. [Figure 8] FIG. 2 is a cross-sectional perspective view illustrating an airflow path in the range hood according to the first embodiment of the present invention. [Figure 9] 1 is a cross-sectional perspective view of a CO2 sensor and its surroundings of a range hood according to a first embodiment of the present invention. [Figure 10] FIG. 1 is a functional block diagram of a range hood according to a first embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional perspective view of the vicinity of a CO2 sensor of a range hood according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <First Example> A range hood 100 according to the present embodiment will be described with reference to Figs. 1 to 10. As shown in Fig. 1, the range hood 100 is a device that is installed above a cooking appliance in the kitchen of a house HS and ventilates indoor air. The range hood 100 has a function of sucking in oily smoke and the like generated by cooking in the kitchen with its large suction power, and also drawing various substances contained in the air in, for example, a living room away from the kitchen, to the range hood 100 together with the air, sucking them in, and discharging them to the outdoors. In the living room, many residents and visitors often gather, which can increase the amount of CO2 contained in people's breath and generate a lot of aerosols due to conversation, which can worsen the air quality in the living room. In this way, the range hood 100 detects substances that are expected to be generated in the living room, which is a space away from the kitchen, and operates based on the detection information, thereby contributing to improving the air quality in the living room.

[0018] In this specification, air quality refers to substances that make up air (e.g., oxygen, carbon monoxide, carbon dioxide, etc.), substances contained in air (e.g., moisture, oil, dust, odorous substances in particulate or gaseous form), and an index indicating the kinetic energy of air (temperature), and is a concept indicating the quality of air that can be sensed or affected by humans. Therefore, in this embodiment, a range hood 100 installed in a house as a ventilation device and a CO2 sensor 11 as the detection unit 10 are exemplified, but the present invention is not limited to this, and naturally includes, for example, a ventilation device installed near a water heater in an office or waste in a factory detecting the air quality of a space (e.g., a reception room, a break room, a smoking room, etc.) that is connected as an air passage but is distant from the installation location, and controlling operation based on the detection information.

[0019] As shown in Figures 2 to 10, the range hood 100 comprises a hood section 91, a main body section 92 connected onto the hood section 91, a fan casing 93 housed inside the main body section 92, a fan 94 (first blower) contained within the fan casing 93 and generating an airflow, an RH control section 20 that controls the operation of the fan 94, an intake opening 95 and air intake holes 11a that draw in the airflow generated by the fan 94, an exhaust port 96 that discharges the drawn-in airflow, a detection section 10 that detects the air quality of the air drawn in through the air intake holes 11a, an inner panel 97 provided at the bottom of the hood section 91 and capturing oily smoke and the like, a straightening plate 98 attached below the inner panel 97 with a specified gap therebelow, a display section 40, a communication section 50, and an error detection section 14.

[0020] The RH control unit 20 is provided inside the main body unit 92 (not shown) and controls the operation of the fan 94 based on the detection information detected by the detection unit 10. The RH control unit 20 is a microcontroller that stores a program for controlling the operation of the fan 94 and executes commands according to the program. The detection unit 10 includes a CO2 sensor 11, a gas sensor 12, and an odor sensor 13, and detects each substance. In this embodiment, the detection unit 10 is the CO2 sensor 11. The display unit 40 displays, for example, the operation status (ventilation operation / constant ventilation operation / search operation, etc.) or displays, for example, the CO2 concentration detected by the CO2 sensor 11 of the detection unit 10. The communication unit 50 communicates with other devices (for example, other sensors, alarms, smartphones, etc.). When the error detection unit 14 detects that the straightening plate 98 has been opened during, for example, ventilation operation / constant ventilation operation / search operation, it notifies the RH control unit 20. When the RH control unit 20 receives the notification, it stops the operation of the fan 94.

[0021] In this embodiment, the hood portion 91 is a thin flat type, but is not limited to this and may be a deep type, so-called boot type, for example. The fan casing 93 arranged inside the main body portion 92 has an intake port 93a opening downward and an intake port 93b opening upward on both sides. A space 80 for air circulation is provided between the inner wall of the main body portion 92 and the outer wall of the fan casing 93. The fan 94 is a sirocco fan with high static pressure arranged with its rotation axis facing vertically, and fits into the intake ports 93a / 93b on the lower and upper sides of the fan casing 93.

[0022] The fan 94 houses a motor 94a that rotates the fan 94 at an upper portion inside the fan 94, and a connecting portion 94c that connects a shaft 94b of the motor 94a to the fan 94 (the impeller or upper end of the sirocco fan) is also located at an upper portion inside the fan 94, so that the amount of air sucked in from the upper end of the fan 94 is less than the amount of air sucked in from the lower end of the fan 94. The upper suction port 93b of the fan casing 93 fits the upper end of the fan 94, and the lower suction port 93a fits the lower end of the fan 94, so that the amount of air sucked in from the upper suction port 93b is less than the amount of air sucked in from the lower suction port 93a. The suction opening 95 fits the lower suction port 93a provided in the fan casing 93, so most of the airflow generated by the fan 94 passes through the suction opening 95. The suction opening 95 is provided to mainly suck in air above the cooking appliance through a gap between an inner panel 97 and a baffle plate 98 provided on the underside of the hood portion 91 .

[0023] On the other hand, air drawn in from the upper suction port 93b of the fan casing 93 is drawn in from a space 80 provided between the inner wall of the main body portion 92 and the outer wall of the fan casing 93. This space communicates with an intake hole 11a provided in the top plate of the hood portion 91 and a connection duct 11b provided inside the hood portion 91 for connecting the intake hole 11a and the space 80. When air is drawn in from the upper suction port 93b of the fan casing 93, the space 80 becomes negative pressure, and accordingly, air outside the range hood 100 is drawn in from the intake hole 11a through the connection duct 11b.

[0024] 8, the range hood 100 forms a flow path for air that is sucked in through the intake opening 95, passes through an intake port 93a below the fan casing 93, the lower end of the fan 94, the impeller of the fan 94, and the inside of the fan casing 93, and is discharged to an exhaust port 96; this flow path is called a main flow path (dotted line). On the other hand, the range hood 100 forms a flow path for air that is sucked in through the intake hole 11a, passes through the connection duct 11b, the space 80 provided between the inner wall of the main body 92 and the outer wall of the fan casing 93, an intake port 93b above the fan casing 93, the upper end of the fan 94, the impeller of the fan 94, and the inside of the fan casing 93, and is discharged to an exhaust port 96; this flow path is called a secondary flow path (dashed line). In the main flow path, a large amount of air flows because it passes through an inlet 93a at the bottom of the fan casing 93, while in the sub flow path, a smaller amount of air flows because it passes through an inlet 93b at the top of the fan casing 93. The main flow path and the sub flow path join inside the fan 94 or at the impeller.

[0025] In this way, the main flow path passes through suction port 93a on one side of fan casing 93, and the sub-flow path passes through suction port 93b on the other side of fan casing 93, which has a smaller air intake volume than the one side. By providing a suction port on the back side of fan 94 in this way, the space inside the main body can be made negative pressure while maintaining the main flow path, making it easy to maintain the sub-flow path.

[0026] In this embodiment, the air intake hole 11a is formed on a surface different from the suction opening 95 of the hood part 91, that is, the top surface of the hood part 91, but is not limited thereto. For example, if the hood part 91 has a long span and can be arranged at a position far from the cooking appliance, the air intake hole 11a may be formed on the lower surface of the hood part 91, which is the same surface as the suction opening 95. In addition, when the air intake hole 11a is on a surface different from the suction opening 95 or on the same surface, it is preferable that the air intake hole 11a is located at a position far from the cooking appliance because the air intake hole 11a is located at a position away from the flow path of the airflow to the suction opening 95 of the hood part 91, is less exposed to air containing oily smoke generated during cooking, and the air taken in is relatively free of pollutants such as oily smoke. The air intake hole 11a may be connected to a sub-flow path so that the air sucked in from the air intake hole 11a communicates with the space 80. In addition, when the range hood 100 is installed, the air intake hole 11a is preferably located outside (toward the room) of the components such as the fascia board 99 and the duct cover that cover the main body part 92, as shown in FIG. 4. This makes it possible to prevent air that is not a living space, such as the attic, from being taken in.

[0027] The CO2 sensor 11 is disposed in a space 80 between the outer wall of the fan casing 93 and the inner wall of the main body 92. That is, the CO2 sensor 11 is disposed in the sub-flow path and detects the air quality of the air in the sub-flow path. In addition, since the main flow path is not suitable for detecting air quality because airflow containing oily smoke passes through it, the CO2 sensor 11 is disposed in a space 80 between the outer wall of the fan casing 93 and the inner wall of the main body 92, which is inside the fan 94 where the main flow path and the sub-flow path join together, or in the sub-flow path upstream of the impeller. In this way, the range hood 100 can detect the air quality in the non-cooking space by detecting the air quality in the sub-flow path, which is a flow path different from the main flow path through which oily smoke and the like generated by cooking flows and has a smaller air volume than the main flow path. In addition, the range hood 100 can detect the air quality in the non-cooking space by detecting the air quality in the sub-flow path sucked in from the intake hole 11a formed on a surface different from the intake opening 95 so as to be different from the main flow path through which oily smoke and the like generated by cooking flows.

[0028] Also, the space 80 inside the main body 92 and outside the fan casing is configured as a sub-flow passage upstream of the inside of the fan 94 or the impeller, which is the joining point. In this way, by configuring the wide space inside the main body 92 as a sub-flow passage in which the CO2 sensor 11 is disposed, the CO2 sensor 11 can be flexibly configured, for example, so that a large CO2 sensor unit can be disposed, and the space can be used effectively.

[0029] The connection duct 11b is formed so as to connect the intake hole 11a formed on the top surface of the hood part 91 to the space 80, and functions as a duct for circulating air. If one end of the connection duct 11b is the intake hole 11a, the other end is the connection duct exhaust hole 11d formed on the top surface of the hood part 91 in the space 80, and the connection duct exhaust hole 11d is directly connected to the inside of the unit of the CO2 sensor 11 within the space 80. The length of the connection duct 11b is preferably the shortest distance connecting the negative pressure space 80 to the outside of the member covering the main body part (for example, the fascia 99). In this embodiment, as shown in FIG. 9, the length of the connection duct 11b is the length from the lower part of the intake hole 11a formed directly below the fascia 99 to the connection duct exhaust hole 11d formed on the back surface of the front cover of the main body part 92. That is, it is a length of about a predetermined distance from a position vertically below the intake hole 11a in the direction of the junction point. Since the distance of the connection duct is short, it is possible to prevent oily smoke and the like other than the target air quality from entering the connection duct 11b, and the CO2 sensor 11 can detect only the air from the intake hole 11a. In addition, the air flow resistance of the connection duct 11b can be reduced, and the material can be minimized. Note that the width of the connection duct 11b is preferably the same as the width of the unit of the CO2 sensor 11, covering the area where the collection of the intake holes 11a is formed, but is not limited to this.

[0030] The air sucked in from the air intake 11a is blown out from the connection duct exhaust hole 11d into the space 80. The blown out air flows toward the intake port 93b above the fan casing 93. In this embodiment, a unit of the CO2 sensor 11 is disposed above the connection duct exhaust hole 11d, and the unit has an exhaust hole 11c facing the fan 94, which is the junction. In this way, the CO2 sensor 11 is disposed at a position vertically below the air intake 11a and spaced a predetermined distance away from the junction. The predetermined distance is a distance at which the air blown out from the connection duct exhaust hole 11d spreads evenly without being locally biased. According to this, the space between the air intake 11a and the CO2 sensor 11 can be partitioned by providing the connection duct 11b that constitutes the sub-flow path, and the air taken in from outside the range hood 100 can be immediately detected by the CO2 sensor 11 without being diluted with the air trapped in the range hood 100. Furthermore, by arranging the CO2 sensor 11 at a position spaced a predetermined distance vertically below the air intake 11a in the direction of the junction, the CO2 sensor 11 can be protected from liquid entering through the air intake.

[0031] The CO2 sensor 11 is disposed inside the sensor unit on a flow path through which air blown out from the connection duct exhaust hole 11d flows to the exhaust hole 11c, that is, on a substantially straight line between the connection duct exhaust hole 11d and the exhaust hole 11c. This allows the CO2 sensor 11 to immediately detect air that has flowed into the sensor unit. In addition, the exhaust hole 11c of the sensor unit is provided on the side surface of the sensor unit, not on the top surface of the sensor unit. This prevents oil or water that has run down from the fan casing 93 or the main body 92 from entering the unit through the exhaust hole 11c and dripping onto the CO2 sensor 11 or the substrate. The multiple holes provided in the intake hole 11a and the exhaust hole 11c have a diameter of 3 mm or less. This prevents dust and oil from entering the unit, and prevents clogging due to oily smoke.

[0032] <Second Example> The range hood 100S of this embodiment will be described with reference to FIG. 11. In order to avoid repetition, the same components are denoted by the same reference numerals and the description is omitted, and the differences from the above embodiment will be mainly described. As shown in FIG. 1, the range hood 100S is a device that is installed above the cooking appliance in the kitchen of the house HS and ventilates the indoor air. The range hood 100S sucks in oily smoke and the like generated by cooking in the kitchen with a fan 94 having a large suction power and exhausts it outdoors, and also draws various substances contained in the air in, for example, the living room away from the kitchen with the small fan 94S to the range hood 100S and sucks them in, detects substances that are expected to be generated in the living room, and operates based on the detection information, contributing to improving the air quality in the living room.

[0033] The range hood 100S comprises a hood section 91, a main body section 92 connected onto the hood section 91, a fan casing 93 housed inside the main body section 92, a fan 94 (first blower) contained within the fan casing 93 and generating a large volume of airflow, an intake opening 95 that draws in the airflow generated by the fan 94, an exhaust port 96 that discharges the drawn-in airflow, a small fan 94S (second blower) that generates a small volume of airflow, an intake hole 11a that draws in the airflow generated by the small fan 94S, a detection section 10 that detects the air quality of the air drawn in through the intake hole 11a, an RH control section 20 that controls the operation of the fan 94 and the small fan 94S, an inner panel 97 provided at the bottom of the hood section 91 and capturing oily smoke and the like, a straightening plate 98 attached below the inner panel 97 with a specified gap therebelow, a display section 40, a communication section 50, and an error detection section 14.

[0034] The RH control unit 20 is provided inside the main body 92 (not shown) and controls the operation of the fan 94S based on the detection information detected by the detection unit 10. The RH control unit 20 operates when the fan 94 is not operating. This allows the range hood 100S to detect air quality even when cooking is not being performed. In addition, since air is not sucked in during cooking, dirt and breakdowns in the detection unit can be reduced.

[0035] As shown in FIG. 11, the air intake hole 11a is formed on the top surface of the hood portion 91, but is not limited thereto and may be provided at a position where the distance from the cooking appliance is longer than the suction opening 95. When the air intake hole 11a is on the top surface of the hood portion 91, the air goes around the hood portion 91 to reach the air intake hole 11a, so the distance from the cooking appliance is longer than the suction opening 95. The connection duct 11b is formed so as to connect the air intake hole 11a formed on the top surface of the hood portion 91 to the space 80. If one end of the connection duct 11b is the air intake hole 11a, the other end is the connection duct exhaust hole 11d formed on the top surface of the hood portion 91 in the space 80, and the connection duct exhaust hole 11d is directly connected to the inside of the unit of the detection portion 10 in the space 80.

[0036] The small fan 94S is disposed in the unit of the detection section 10, and is configured to draw air from the intake hole 11a, and exhaust the air through the connection duct 11b, the connection duct exhaust hole 11d, and the detection section 10 to the exhaust hole 11Sc provided on the side of the main body section 92. That is, the small fan 94S generates an airflow from the intake hole to the exhaust hole communicating with the intake hole to form a sub-flow path (dash line in the figure), and the detection section 10 detects the air quality of the air in the sub-flow path. With this, it is possible to provide a range hood 100S that detects the air quality in a non-cooking time or in a non-cooking space by detecting the air quality in the sub-flow path isolated from the main flow path, which is sucked in from the intake hole 11a disposed at a position away from the airflow flow path (main flow path) to the intake opening 95 of the hood section 91 for sucking in oily smoke and the like generated by cooking. With this configuration, the main flow path and the sub-flow path in which the detection section 10 is disposed are isolated, so that oily smoke and the like generated by cooking are less likely to flow into the detection section 10. This reduces the risk of the detection unit 10 becoming dirty or breaking down.

[0037] In this embodiment, the exhaust hole 11Sc is provided in the main body 92, but the exhaust hole may be provided on the side of the unit of the detection unit 10, and the small fan 94S may be configured to exhaust air toward the exhaust hole. In this case, the small fan 94S is arranged in the sub-flow path upstream of the junction with the main flow path. In this way, by further providing a fan 94S that is arranged in the sub-flow path and operates when the fan 94 is not operating, the air quality can be detected even when cooking is not being performed. In addition, since air during cooking is not sucked in, dirt and failure of the detection unit 10 can be reduced. In this embodiment, the small fan 94S is arranged in the unit of the detection unit 10, and air is exhausted from the exhaust hole 11Sc provided on the side of the main body 92, but the small fan 94S may be housed in the connection duct, and the exhaust hole may be formed on the top surface of the hood outside the main body 92. Even with this form, the main flow path and the sub-flow path in which the detection unit 10 is arranged are isolated from each other, so that the effect of preventing oily smoke and the like generated by cooking from flowing into the detection unit 10 is obtained.

[0038] The present invention is not limited to the illustrated examples, and may be implemented in any configuration that does not deviate from the scope of the claims. That is, the present invention has been particularly illustrated and described mainly with respect to specific embodiments, but those skilled in the art may make various modifications to the above-described embodiments in terms of the number and other details of the configuration without departing from the scope of the technical idea and purpose of the present invention. [Explanation of symbols]

[0039] 100 Range hood (ventilation device) 10. Detection section 11 CO2 sensor 11a Air intake 11b Connecting duct 11c Exhaust hole 11d Connection duct exhaust hole 12 Gas Sensor 13 Odor Sensor 14 Error detection unit 20 RH control unit (operation control unit) 21 Differential value acquisition section 30 Operation switch 40 Display Panel 50 Communications Department 80 Space between the inner wall of the main body and the outer wall of the fan casing 91 Food Section 92 Main body 93 Fan casing 93a Lower intake 93b Upper intake 94 Fan (first blower) 94S Small fan (second blower) 94a Motor 94b Shaft 94c connection part 95 Suction opening 96 Discharge port 97 Inner Panel 98 Rectifier plate 99 Skirting Board

Claims

1. A range hood including a hood section having an intake opening section provided for generating an airflow by operating a first fan to draw in air above a cooking appliance, and a main body section having an exhaust port provided for discharging the drawn-in air, a main flow path extending from the suction opening to the first fan in a flow path of the airflow; a sub-flow path extending from an intake hole formed on a surface of the hood portion different from the intake opening portion to the first blower; a detection unit that is disposed in the secondary flow passage upstream of a junction of the main flow passage and the secondary flow passage and detects an air quality of the air in the secondary flow passage; Equipped with an airflow flows in the main flow path and the sub-flow path by operating the first blower, and the detection unit detects the air quality of the air in the sub-flow path when the airflow is generated in the sub-flow path by operating the first blower; Range hood.

2. The range hood according to claim 1, characterized in that the main body has a fan casing having the first blower inside, and the space inside the main body and outside the fan casing is configured as the secondary flow path upstream of the junction.

3. the fan casing has suction ports on both sides of a rotation shaft of the first blower, The main flow path passes through the suction port on one side of the fan casing, The range hood according to claim 2 , wherein the sub-flow path passes through the suction port on the other side of the fan casing, which has a smaller air intake volume than the one side.

4. a connection duct that constitutes the secondary flow passage that communicates the detection unit and the intake hole; 3. The range hood according to claim 1, wherein the detection unit is disposed at a position vertically below the air intake hole and spaced a predetermined distance in a direction toward the junction.

5. 5. The range hood according to claim 1, wherein the air intake hole is provided in a top plate of the hood portion and is disposed outside a member covering the main body portion.

6. The range hood according to any one of claims 1 to 5, further comprising a second fan arranged in the secondary flow passage upstream of the junction and operating when the first fan is not operating.

7. A range hood including a hood section having an intake opening section provided for generating an airflow by operating a first fan to draw in air above a cooking appliance, and a main body section having an exhaust port provided for discharging the drawn-in air, an intake hole provided at a position that is farther from the cooking appliance than the intake opening; an exhaust hole communicating with the intake hole; a main flow path extending from the suction opening to the discharge port; a secondary flow passage extending from the intake hole to the exhaust hole; a second blower that generates an airflow from the intake hole to the exhaust hole in the secondary flow passage; A detection unit for detecting the quality of the air in the sub-channel; Equipped with the detection unit detects the air quality of the air in the sub-flow path when the second blower is operating to generate an airflow in the sub-flow path. Range hood.

8. The range hood according to claim 7, wherein the air intake hole is provided in a top plate of the hood portion and is disposed outside a member covering the main body portion.

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