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 include sensors for detecting miscellaneous gases and odors generated during cooking and control the exhaust airflow rate based on the concentrations 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 the range hood. This range hood includes 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 an air passage inside the casing, which is disposed on the rear wall. The gas sensor is disposed facing the air passage at a position recessed a predetermined distance from the inner surface of the air passage to prevent contamination of the gas sensor's detection section, and is configured to update the set airflow rate based on the detected gas concentration and the set airflow rate.

[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. This range hood includes a range hood body that defines an exhaust path, a main fan and a sub-fan that exhaust gas through the exhaust path, and a gas sensor located on the outside front 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] Japanese Patent Application Publication No. 2019-020008 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-249321 Summary of the Invention [Problem to be solved by the invention]

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

[0006] Therefore, the present invention provides a range hood that can suitably detect gases generated in a non-cooking space when cooking is not being performed. [Means for solving the problem]

[0007] In order to solve the above problems, a range hood is provided which includes a hood section having an intake opening provided for generating an airflow by operating a first fan and drawing in air above a cooking appliance, and a main section having an outlet provided for discharging the drawn-in air, and in the airflow path, a main flow path from the intake opening to the first fan and a flow path formed on a surface different from the intake opening of the hood section. , sucking in air from the space where the range hood is installed A range hood is provided which includes a secondary flow path from an intake port to a first fan, and a detection unit which is arranged in the secondary flow path upstream of the junction of the main flow path and the secondary flow path and which detects the air quality of the air in the secondary flow path, and in which airflows flow in the main flow path and the secondary flow path when the first fan is operating, and the detection unit detects the air quality of the air in the secondary flow path when the first fan is operating and an airflow is generated in the secondary flow path. This allows a range hood to be provided that can detect the air quality outside of 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 intake 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 with a first blower inside, and the space inside the main body and outside the fan casing may be configured as a secondary flow path upstream of the confluence. According to this, by configuring the large space inside the main body as a sub-flow path in which the detection unit is arranged, the detection unit can be configured flexibly and space can be used effectively.

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

[0010] Furthermore, the device may be characterized in that it includes a connecting duct that forms a secondary flow path that connects the detection unit to the intake port, and the detection unit is positioned at a predetermined distance from a position vertically below the intake port in the direction of the confluence. According to this, by providing a connecting duct that forms 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 inside the range hood. Also, by placing the detection unit at a predetermined distance from a position vertically below the intake hole in the direction of the confluence, it is possible to protect the detection unit from liquid entering through the intake hole.

[0011] Furthermore, the air intake hole may be provided in the top plate of the hood portion and positioned outside the member covering the main body portion. With 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 intake opening of the hood section and it is possible to prevent the intake of air that is not from living spaces such as the attic.

[0012] Furthermore, the air conditioner may further comprise a second fan that is disposed in the sub-flow passage upstream of the junction and that operates when the first fan is not operating. By providing a second fan that is located in the sub-flow path and operates when the first fan is not operating, the air quality can be detected even when cooking is not being performed. In addition, since the air is not drawn in during cooking, contamination and malfunction of the detector can be reduced. [Effects of the Invention]

[0015] As described above, according to the present invention, it is possible to provide a range hood that can suitably detect gases generated in a non-cooking space when cooking is not being performed. [Brief explanation of the drawings]

[0016] [Figure 1] 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. [Figure 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; [Figure 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. [Figure 5] 1A and 1B are a front view and a cross-sectional view taken along line HH, respectively, of a range hood according to a first embodiment of the present invention; [Figure 6] 1A and 1B are a front view and a cross-sectional view taken along line JJ, respectively, of a range hood according to a first embodiment of the present invention; [Figure 7] 1A and 1B are a front view and a cross-sectional view taken along the line KK, respectively, of a range hood according to a first embodiment of the present invention; [Figure 8] 1 is a cross-sectional perspective view illustrating an airflow path in a range hood according to a 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] 1 is a functional block diagram of a range hood according to a first embodiment of the present invention. [Figure 11] FIG. 10 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 INVENTION

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <First Example> A range hood 100 according to this embodiment will be described with reference to FIGS. 1 to 10. As shown in FIG. 1, the range hood 100 is a device installed above a cooking appliance in the kitchen of a house HS for ventilating indoor air. The range hood 100 uses its strong suction power to suck in oily smoke and other substances generated by cooking in the kitchen, and also draws various substances contained in the air in areas away from the kitchen, such as the living room, to the range hood 100, which then expels them outdoors. Living rooms are often crowded with residents and visitors, which can lead to increased CO2 levels in people's breath and the generation of aerosols due to conversation, thereby deteriorating the air quality in the living room. The range hood 100 thus detects substances that are likely to be generated in the living room, a space away from the kitchen, and operates based on the detected 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 that indicates 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 this is not limited to this, and it naturally also includes, for example, a ventilation device installed near an office water heater or a factory waste disposal site detecting the air quality in 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 to the top of 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 an intake hole 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 intake hole 11a, an inner panel 97 provided at the bottom of the hood section 91 and capturing oily smoke and the like, a rectifying plate 98 attached below the inner panel 97 with a predetermined gap therebelow, a display section 40, a communication section 50, and an error detection section 14.

[0020] The RH control unit 20 (not shown) is provided inside the main body 92 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 operating status (ventilation operation, constant ventilation operation, search operation, etc.) or the CO2 concentration detected by the CO2 sensor 11 of the detection unit 10. The communication unit 50 communicates with other devices (e.g., other sensors, alarms, smartphones, etc.). The error detection unit 14 notifies the RH control unit 20 when it detects that the rectifier plate 98 is open during ventilation operation, constant ventilation operation, or search operation. Upon receiving the notification, the RH control unit 20 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, so-called boot type, for example. A fan casing 93 disposed inside the main body portion 92 has an intake port 93a that opens downward and an intake port 93b that opens 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 high-static pressure sirocco fan disposed with its rotation axis oriented vertically, and fits into the intake ports 93a / 93b at the bottom and top 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. Therefore, 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 intake port 93b of the fan casing 93 matches the upper end of the fan 94, and the lower intake port 93a matches the lower end of the fan 94, so the amount of air sucked in from the upper intake port 93b is less than the amount of air sucked in from the lower intake port 93a. The intake opening 95 matches the lower intake port 93a provided in the fan casing 93, so most of the airflow generated by the fan 94 passes through the intake opening 95. The intake opening 95 is provided to mainly suck in air above the cooker through the gap between an inner panel 97 and a straightening plate 98 provided on the underside of the hood portion 91 .

[0023] Meanwhile, air drawn in through upper intake port 93b of fan casing 93 is drawn in from space 80 provided between the inner wall of main body 92 and the outer wall of fan casing 93. This space is in communication with intake hole 11a provided in the top plate of hood 91 and connecting duct 11b provided inside hood 91 for connecting intake hole 11a to space 80. When air is drawn in through upper intake port 93b of fan casing 93, negative pressure is created in space 80, and accordingly, air from outside range hood 100 is drawn in through intake hole 11a via connecting duct 11b.

[0024] 8, the range hood 100 forms a flow path for air that is drawn 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 the main flow path (dotted line). On the other hand, the range hood 100 forms a flow path for air that is drawn in through the intake holes 11a, passes through the connecting 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 the secondary flow path (dashed dotted line). A large amount of air flows through the main flow path because it passes through an intake port 93a at the bottom of the fan casing 93, while a smaller amount of air flows through the sub-flow path because it passes through an intake port 93b at the top of the fan casing 93. The main flow path and sub-flow path join inside the fan 94 or at the impeller.

[0025] In this way, the main flow path passes through intake port 93a on one side of fan casing 93, and the sub-flow path passes through intake port 93b on the other side of fan casing 93, which has a smaller intake air volume than the one side. By providing an intake 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 possible to easily maintain the sub-flow path.

[0026] In this embodiment, the air intake vent 11a is formed on a different surface of the hood portion 91 from the intake opening 95, i.e., the top surface of the hood portion 91. However, this is not limited thereto. For example, if the hood portion 91 has a long span and can be positioned far from the cooking appliance, the air intake vent 11a may be formed on the underside of the hood portion 91, which is the same surface as the intake opening 95. Note that, if the air intake vent 11a is on a different surface from the intake opening 95 or on the same surface, it is preferable that the air intake vent 11a be located far from the cooking appliance because it is located away from the airflow path to the intake opening 95 of the hood portion 91, and is less exposed to air containing oily smoke and other contaminants generated during cooking. Therefore, the intake air is relatively free of oily smoke and other contaminants. The air intake vent 11a may be connected to a secondary flow path so that the air drawn therein communicates with the space 80. Note that, when the range hood 100 is installed, the air intake vent 11a is preferably located outside (toward the room) of components such as the fascia panel 99 and duct cover that cover the main body portion 92, as shown in FIG. 4 . This prevents air from being drawn into non-living spaces such as the attic.

[0027] The CO2 sensor 11 is located in the 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 located in the secondary flow path and detects the air quality of the air in the secondary flow path. Because the main flow path is an unsuitable location for detecting air quality due to the oily smoke-laden airflow that passes through it, the CO2 sensor 11 is located inside the fan 94, where the main and secondary flow paths converge, or in the space 80 between the outer wall of the fan casing 93 and the inner wall of the main body 92, in the secondary 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 secondary flow path, which is a different flow path from the main flow path through which oily smoke and other substances generated by cooking flow and has a smaller airflow rate than the main flow path. The range hood 100 can also detect the air quality in the non-cooking space by detecting the air quality in the secondary flow path drawn in through the air intake holes 11a, which are located on a different surface from the intake opening 95 and are different from the main flow path through which oily smoke and other substances generated by cooking flow.

[0028] Furthermore, the space 80 inside the main body 92 but outside the fan casing is configured as a secondary flow path upstream of the inside of the fan 94 or the impeller, which is the confluence point. In this way, by configuring the large space inside the main body 92 as a secondary flow path in which the CO2 sensor 11 is to be placed, the CO2 sensor 11 can be flexibly configured, for example, a large CO2 sensor unit can be placed, and space can be used effectively.

[0029] The connection duct 11b is formed to connect the air intake hole 11a formed on the top surface of the hood portion 91 to the space 80 and functions as a duct for circulating air. One end of the connection duct 11b is the air intake hole 11a, and the other end is the connection duct exhaust hole 11d formed on the top surface of the hood portion 91 within the space 80. The connection duct exhaust hole 11d is directly connected to the CO2 sensor 11 unit 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 portion (e.g., the header panel 99). In this embodiment, as shown in FIG. 9, the length of the connection duct 11b is the length from the lower portion of the air intake hole 11a formed directly below the header panel 99 to the connection duct exhaust hole 11d formed on the back surface of the front cover of the main body portion 92. In other words, the length is approximately a predetermined distance from a position vertically below the air intake hole 11a toward the confluence point. Because the distance of the connecting duct is short, oily smoke and other substances other than the target air quality can be prevented from entering the connecting duct 11b, and the CO2 sensor 11 can detect only the air from the intake port 11a. In addition, the airflow resistance of the connecting duct 11b can be reduced, and the components can be minimized. Note that the width of the connecting duct 11b is preferably set to a width that covers the area where the intake port 11a is formed and is the same as the width of the CO2 sensor 11 unit, but is not limited to this.

[0030] Air drawn in through the air intake 11a is blown out through the connecting duct exhaust 11d into the space 80. The blown air flows toward the air intake 93b at the top of the fan casing 93. In this embodiment, a CO2 sensor 11 unit is disposed above the connecting duct exhaust 11d, with the exhaust 11c facing the fan 94, where the air flows. Thus, the CO2 sensor 11 is disposed vertically below the air intake 11a at a predetermined distance toward the confluence. The predetermined distance is the distance over which the air blown out through the connecting duct exhaust 11d is uniformly dispersed without localized unevenness. The connecting duct 11b, which forms a secondary flow path, separates the space between the air intake 11a and the CO2 sensor 11. This allows the air drawn in from outside the range hood 100 to be immediately detected by the CO2 sensor 11 without being diluted with the air trapped inside the range hood 100. Furthermore, by arranging the CO2 sensor 11 at a position that is a predetermined distance away from a position vertically below the intake hole 11a in the direction of the confluence, the CO2 sensor 11 can be protected from liquid entering through the intake hole.

[0031] The CO2 sensor 11 is positioned inside the sensor unit in the flow path where air blown out from the connection duct exhaust hole 11d flows to the exhaust hole 11c, i.e., approximately in a straight line between the connection duct exhaust hole 11d and the exhaust hole 11c. This allows the CO2 sensor 11 to immediately detect air flowing into the sensor unit. Furthermore, the exhaust hole 11c of the sensor unit is located on the side surface rather than the top surface of the sensor unit. This prevents oil or water from entering the unit from the fan casing 93 or main body 92, entering the unit through the exhaust hole 11c, and dripping onto the CO2 sensor 11 or the circuit board. The multiple holes in the intake hole 11a and exhaust hole 11c have a diameter of 3 mm or less. This prevents the intrusion of dust and oil and prevents clogging due to oily smoke.

[0032] <Second Example> A range hood 100S of this embodiment will be described with reference to FIG. 11. To avoid repetition, the same components are denoted by the same reference numerals and their descriptions are omitted. The following description focuses on differences from the previous embodiment. As shown in FIG. 1, the range hood 100S is installed above the cooking appliance in the kitchen of a house HS to ventilate the indoor air. The range hood 100S uses a fan 94 with high suction power to suck in oily smoke and other substances generated by cooking in the kitchen and expels them outdoors. It also uses a small fan 94S to draw various substances contained in the air away from the kitchen, for example, in the living room, and sucks them in. The range hood 100S detects substances that are likely to be generated in the living room and operates based on the detected 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 to the top of 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 that captures oily smoke and the like, a rectifying plate 98 attached below the inner panel 97 with a predetermined 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 drawn in during cooking, contamination and malfunction of the detection unit can be reduced.

[0035] As shown in Fig. 11, air intake hole 11a is formed on the top surface of hood portion 91, but is not limited to this and may be located at a position where it is further away from the cooker than air intake opening 95. If air intake hole 11a is located on the top surface of hood portion 91, air must travel around hood portion 91 to reach air intake hole 11a, so its distance from the cooker is longer than air intake opening 95. Connection duct 11b is formed to connect air intake hole 11a formed on the top surface of hood portion 91 to space 80. If one end of connection duct 11b is air intake hole 11a, the other end is connection duct exhaust hole 11d formed on the top surface of hood portion 91 within space 80, and connection duct exhaust hole 11d is directly connected to the inside of the detection unit 10 unit within space 80.

[0036] The small fan 94S is located within the detector 10 and is configured to draw air through the intake vent 11a, pass through the connecting duct 11b, the connecting duct exhaust vent 11d, and the detector 10, and then exhaust it to the exhaust vent 11Sc located on the side of the main body 92. That is, the small fan 94S generates an airflow from the intake vent to the exhaust vent connected to the intake vent, forming a secondary flow path (shown by a dashed-dotted line in the figure), and the detector 10 detects the air quality of the air in the secondary flow path. This configuration provides a range hood 100S that detects the air quality outside of cooking or in non-cooking spaces by detecting the air quality in the secondary flow path, which is isolated from the main airflow path (main flow path) leading to the suction opening 95 of the hood 91 for sucking in oily smoke and other contaminants generated by cooking. This configuration isolates the main flow path from the secondary flow path where the detector 10 is located, making it difficult for oily smoke and other contaminants generated by cooking to flow into the detector 10. This reduces the risk of contamination and breakdown of the detection unit 10.

[0037] In this embodiment, the exhaust hole 11Sc is provided in the main body 92. Alternatively, the exhaust hole may be provided on the side 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 located in the secondary flow path upstream of the junction with the main flow path. By providing an additional fan 94S in the secondary flow path that operates when the fan 94 is not operating, air quality can be detected even when cooking is not being performed. Furthermore, since the device does not draw in air during cooking, contamination and malfunction of the detection unit 10 can be reduced. In this embodiment, the small fan 94S is located within the detection unit 10 and exhausts air through the exhaust hole 11Sc on the side of the main body 92. However, the small fan 94S may be housed in a connecting duct, and the exhaust hole may be formed on the top surface of the hood outside the main body 92. This configuration also provides the advantage of isolating the main flow path from the secondary flow path in which the detection unit 10 is located, thereby preventing oily smoke and other substances generated during cooking from flowing into the detection unit 10.

[0038] It should be noted that the present invention is not limited to the illustrated examples, and can be implemented in configurations that do not deviate from the scope of the claims. That is, although the present invention has been particularly shown and described primarily with reference to specific embodiments, those skilled in the art can make various modifications to the above-described embodiments in terms of the number and other details 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 unit 11 CO2 sensor 11a Intake hole 11b Connecting duct 11c Exhaust vent 11d Connecting duct exhaust hole 12 Gas Sensor 13 Odor Sensor 14 Error detection unit 20 RH control unit (operation control unit) 21 Differential value acquisition unit 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 Intake opening 96 Discharge port 97 Inner panel 98 Rectifier plate 99 Curtain board

Claims

1. A range hood including: a hood section having an intake opening provided for generating an airflow by operating a first fan to draw air above a cooking appliance; and a main body section having an outlet provided for discharging the drawn air, a main flow path for the airflow from the suction opening to the first fan; a secondary flow path extending from an intake hole formed on a surface of the hood portion different from the intake opening portion, the intake hole sucking air from a space in which the range hood is installed, to the first fan; a detector disposed in the secondary flow path upstream of a junction of the main flow path and the secondary flow path, and detecting an air quality of the air in the secondary flow path; Equipped with an airflow is generated in the main flow path and the sub-flow path by the operation of the first fan, 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 the operation of the first fan; Range hood.

2. The range hood according to claim 1, characterized in that the main body has a fan casing with 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 confluence.

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

4. a connecting duct that constitutes the secondary flow path that connects 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 the direction of the junction.

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

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

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