Oil fume sensor and kitchen appliance

Abstract

The application discloses an oil fume sensor and a kitchen appliance. The oil fume sensor comprises a sensor shell, an air inlet, an air outlet and a light detection cavity, the air inlet and the air outlet being communicated with the light detection cavity; a light emitting assembly for emitting light to the light detection cavity; a light receiving assembly for receiving light emitted by the light emitting assembly; and a plurality of light traps arranged in the light detection cavity, the plurality of light traps being provided with a plurality of light trap cavities to eliminate light emitted into the light trap cavities. The oil fume sensor of the embodiment of the application is provided with the light trap cavities by arranging the light traps, so that the light emitted into the light trap cavities can be reflected and absorbed in the light trap cavities for multiple times, the probability of the light receiving assembly receiving light reflected by the cavity wall of the light detection cavity is reduced, and the error of the light receiving assembly in detecting the oil fume concentration is effectively eliminated.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and in particular to an oil fume sensor and a kitchen appliance. Background Technology

[0002] A smart range hood is a range hood with certain intelligent adjustment functions. In order to ensure that a smart range hood can respond to oil fumes in a timely manner, various types of oil fume sensors are essential.

[0003] A fume sensor can be equipped with a light emitter and a light receiver. When there is oil fume between the emitter and receiver, it will affect the light received by the receiver, thus determining the oil fume concentration. Furthermore, some light emitted by the emitter is reflected back to the receiver by the surrounding housing, causing errors in the receiver's measurement results and making it difficult for the fume sensor to accurately measure the current oil fume level. Summary of the Invention

[0004] This invention provides an oil fume sensor and a kitchen appliance.

[0005] The oil fume sensor according to embodiments of the present invention includes:

[0006] A sensor housing, the sensor housing including an air inlet, an air outlet and a light detection cavity, the air inlet and the air outlet being connected to the light detection cavity;

[0007] A light emitting component is used to emit light into the light detection cavity;

[0008] A light receiving component, used to receive light emitted by the light emitting component;

[0009] A plurality of optical trapping devices are disposed in the optical detection cavity, and the plurality of optical trapping devices are provided with a plurality of optical trapping cavities to eliminate light emitted into the optical trapping cavities.

[0010] In some embodiments, the cross-section of the optical trap cavity is conical.

[0011] In some embodiments, an angle is formed between the optical axis of the light emitting component and the optical axis of the light receiving component, and the cone-shaped apex of the light trap cavity is located on the optical axis of the light emitting component and the light trap cavity is symmetrical about the optical axis of the light emitting component.

[0012] In some embodiments, an angle is formed between the optical axis of the light emitting component and the optical axis of the light receiving component, the conical apex of the light trap cavity is located on the optical axis of the light receiving component, and the light trap cavity is symmetrical about the optical axis of the light receiving component.

[0013] In some embodiments, the cavity wall of the optical trap cavity is provided with several protrusions with an arc-shaped cross-section.

[0014] In some embodiments, the roughness of the cavity wall of the optical trap cavity is greater than or equal to 12.5 micrometers.

[0015] In some embodiments, the walls of the light trap cavity are black.

[0016] In some embodiments, the optical detection cavity is located in the region between the air inlet and the air outlet to form a optical detection area, the optical axis of the optical emitting component passes through the optical detection area, and the optical axis of the optical receiving component also passes through the optical detection area.

[0017] In some embodiments, the light emitting assembly includes a light emitter and a light emitting lens, the light emitter being located at the focal point of the light emitting lens, and the light emitted by the light emitter being incident on the light detection area through the light emitting lens.

[0018] In some embodiments, the light receiving component includes a light receiver and a light receiving lens, the light receiver being located at the focal point of the light receiving lens, and the light receiver receiving light through the light receiving lens.

[0019] The present invention also provides a kitchen appliance, the kitchen appliance comprising: an appliance housing; a fan assembly installed inside the appliance housing; and an oil fume sensor as described in the above embodiments, installed in the appliance housing.

[0020] The oil fume sensor and kitchen appliance of the present invention, by setting the light trapping element to form the light trapping cavity, allows light that is not received by the light receiving component to be reflected and absorbed multiple times within the light trapping cavity, reducing the probability that the light receiving component receives light reflected from the cavity wall of the light detection cavity, and effectively eliminating the error in the detection of oil fume concentration by the light receiving component.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a cross-sectional view of the oil fume sensor according to an embodiment of the present invention;

[0024] Figure 2 This is another cross-sectional view of the oil fume sensor according to an embodiment of the present invention;

[0025] Figure 3This is a schematic diagram illustrating the principle of the oil fume sensor according to an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 This is a schematic diagram of the structure of a kitchen appliance according to an embodiment of the present invention.

[0028] Key features and reference numerals:

[0029] Oil fume sensor 100, sensor housing 10, air inlet 11, air outlet 12, light detection cavity 13, protrusion 131, light detection area 14, light emitting assembly 20, light emitter 21, light emitting lens 22, light receiving assembly 30, light receiver 31, light receiving lens 32, light trapping component 40, light trapping cavity 41, protrusion 50, fin 60, oil fume particles 70, kitchen appliance 1000, appliance housing 200, fan assembly 300. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0035] Please see Figure 1 and Figure 2 This invention provides an oil fume sensor 100, which includes a sensor housing 10, a light emitting component 20, a light receiving component 30, and a plurality of light trapping elements 40. The sensor housing 10 includes an air inlet 11, an air outlet 12, and a light detection cavity 13, with the air inlet 11 and air outlet 12 communicating with the light detection cavity 13. The light emitting component 20 emits light into the light detection cavity 13. The light receiving component 30 receives the light emitted by the light emitting component 20. A plurality of light trapping elements 40 are disposed in the light detection cavity 13, and each of the light trapping elements 40 has a plurality of light trapping cavities 41 to eliminate light emitted into the light trapping cavities 41.

[0036] The oil fume sensor 100 of the present invention forms an oil fume trapping cavity 41 by setting an oil fume trapping element 40, so that the light emitted into the oil fume trapping cavity 41 can be reflected and absorbed multiple times in the oil fume trapping cavity 41, thereby reducing the probability that the oil fume receiving component 30 receives the light reflected from the cavity wall of the oil fume detection cavity 13 and effectively eliminating the error of the oil fume concentration detected by the oil fume receiving component 30.

[0037] Specifically, the fume sensor 100 can be a gas particle concentration detection device. The oil fume particles 70 generated by the user using the kitchen appliance 1000 will mix with the gas and enter the fume sensor 100. Therefore, by detecting the gas particle concentration, it can be determined whether the user is cooking. There are many types of gas particle concentration detection devices, such as infrared detection devices and laser detection devices, etc., and no specific limitation is made here.

[0038] Taking the oil fume sensor 100 as an infrared detection device as an example, the oil fume sensor 100 may also include a main control board. The light emitting component 20 can emit light into the gas that may be contaminated with oil fumes, and the light receiving component 30 can receive the light emitted by the light emitting component 20. The main control board is electrically connected to the light emitting component 20 and the light receiving component 30, thereby controlling the light emitted by the light emitting component 20 and determining the current oil fume situation in the gas based on the light information received by the light receiving component 30. It can be understood that the particle size range of the oil fume particles 70 is 100nm to 10um. When the oil fume particles 70 pass through the light path of the light emitting component 20, they can cause the infrared light to be blocked, scattered, and diffracted. That is to say, the oil fume particles 70 affect the intensity of the light received by the light receiving component 30, thus causing changes in the light information obtained by the main control board.

[0039] The optical axes of the light emitting component 20 and the light receiving component 30 of the infrared detection device can be aligned on the same straight line, allowing them to be positioned opposite each other. In the absence of oil fume particles 70, the light emitted by the light emitting component 20 can be received by the light receiving component 30 without obstruction. However, in the presence of oil fume particles 70, these particles can cause obstruction, scattering, and diffraction of infrared light, preventing some of the light emitted by the light emitting component 20 from being received by the light receiving component 30. Thus, by setting up the light trapping element 40, in the absence of oil fume particles 70, relatively accurate light information from the light receiving component 30 can be measured. In the presence of oil fume particles 70, it can absorb light that has not been scattered to the light receiving component 30, ensuring that the light received by the light receiving component 30 is primarily affected by the oil fume particles 70.

[0040] The optical axes of the light emitting component 20 and the light receiving component 30 of the infrared detection device can form an angle. In this case, without oil fume particles 70, the light emitted by the light emitting component 20 cannot be received by the light receiving component 30. With oil fume particles 70 present, these particles can cause blocking, scattering, and diffraction of infrared light, allowing a portion of the light emitted by the light emitting component 20 to be received by the light receiving component 30. Therefore, by setting up the light trapping component 40, in the absence of oil fume particles 70, it absorbs the light emitted by the light emitting component 20, preventing the light receiving component 30 from receiving reflected light and causing errors in the light information. In the presence of oil fume particles 70, it absorbs the light that is not scattered to the light receiving component 30, ensuring that the light received by the light receiving component 30 is primarily affected by the oil fume particles 70.

[0041] The main control board can also be equipped with a communication module, which can connect to mobile terminals such as mobile phones, tablets, and computers to facilitate user control of the fume sensor 100. The communication module can also be electrically or communicatively connected to other components of the kitchen appliance 1000 to enable or disable the fume sensor 100 based on the status of the switching components of the kitchen appliance 1000, and to enable or disable the motor components or increase or decrease the power of the fan assembly 300 based on the detection results of the fume sensor 100.

[0042] The sensor housing 10 may include a bottom shell and a top cover. An air inlet 11 is located on the bottom shell, and an air outlet 12 is located on the top cover. The bottom shell and the top cover together form a photodetector cavity 13. There are many ways to connect the bottom shell and the top cover. For example, the bottom shell and the top cover can be connected by threads. In one embodiment, the bottom shell has a threaded protrusion on its periphery, and the inner edge of the top cover has a threaded groove that mates with the threaded protrusion. The cross-sections of both the bottom shell and the top cover are circular. The top cover can rotate relative to the bottom shell to realize the installation and removal of the top cover and the bottom shell. In this way, the top cover and the bottom shell can be detachably connected, which facilitates the installation, removal, and maintenance of various components in the photodetector cavity 13. In addition, it is more difficult for external oil fume particles 70 to enter the photodetector cavity 13 through the connection between the top cover and the bottom shell. Alternatively, the bottom shell and the top cover can be connected by the cooperation of a buckle and a through hole. In one embodiment, the top cover has a buckle protruding, and the bottom shell has a through hole that mates with the buckle. The buckle and the through hole are fastened together to realize the connection between the bottom shell and the top cover. These are just a few examples.

[0043] The sensor housing 10 may also include multiple fins 60, which are respectively mounted on the bottom shell and the top cover, and located within the photodetector cavity 13. One end of each fin 60 may have a semi-circular through-hole. The fins 60 mounted on the bottom shell and the fins 60 mounted on the top cover can be joined together to form a circular through-hole. In this way, the light emitted by the light emitting assembly 20 or the light received by the light receiving assembly 30 can be shaped by the circular through-hole. Furthermore, each fin 60 has only a semi-circular through-hole; by joining two fins 60 together to form a circular through-hole, the production and demolding of the fins 60 can be facilitated, accelerating production efficiency.

[0044] The shape of the light trap element 40 can be various, such as cuboid, cone, etc. There are no specific restrictions here. Several light trap elements 40 can have the same shape or different shapes, which will not be elaborated here.

[0045] It is worth noting that there are many ways in which the optical trapping component 40 is provided with the optical trapping cavity 41. It can be that the optical trapping component 40 is recessed with a groove, and the groove forms the optical trapping cavity 41. Alternatively, the optical trapping component 40 and the cavity wall of the optical detection cavity 13 can be combined to form the optical trapping cavity 41. Or multiple optical trapping components 40 can be combined to form the optical trapping cavity 41. No specific limitation is made here.

[0046] It is worth noting that the light trapping device 40 eliminates the light emitted into the light trapping cavity 41 by either weakening the light or absorbing the light, as long as it can reduce the intensity or probability of the light reflected into the light detection cavity 13.

[0047] Please see Figure 1 , Figure 3 and Figure 4 In some embodiments, the cross-section of the light trap cavity 41 is conical.

[0048] With this configuration, after light enters the light trap cavity 41, it can be reflected back and forth on both sides of the cone until it is absorbed by the cavity wall of the light trap cavity 41.

[0049] Specifically, the conical opening should face the direction in which light emitted by the light-emitting component 20 may enter. The angle between the two sides of the cone can be in the range of (0, 90 degrees). The specific angle between the two sides of the cone can be adjusted according to actual needs, and no specific limitation is made here. It can be understood that if the angle between the two sides of the cone is smaller, the effect of reflecting and absorbing light is better; if the angle between the two sides of the cone is larger, light can more easily enter the light trap cavity 41 and be reflected and absorbed by the light trap cavity 41.

[0050] It is worth noting that the fume sensor 100 may include multiple optical trap cavities 41. Each optical trap cavity 41 may have a conical cross-section. In this case, the angles between the two sides of the cone shape of each optical trap cavity 41 may be all the same, different, or partially the same and partially different. Alternatively, some optical trap cavities 41 may have a conical cross-section, while others may have other cross-sections; these will not be listed here.

[0051] Please see Figure 1 , Figure 3 and Figure 4 In some embodiments, an angle is formed between the optical axis of the light emitting component 20 and the optical axis of the light receiving component 30, and the cone-shaped apex of the light trap cavity 41 is located on the optical axis of the light emitting component 20 and the light trap cavity 41 is symmetrical about the optical axis of the light emitting component 20.

[0052] With this configuration, the light emitted by the light emitting component 20 is directed toward the light trap cavity 41, so that the light emitted into the light trap cavity 41 is continuously emitted and absorbed within the light trap cavity 41, thereby achieving a better absorption effect on the light.

[0053] Specifically, the angle between the optical axis of the light emitting component 20 and the optical axis of the light receiving component 30 can be various, such as 30°, 45°, 60°, 90°, 120°, etc., as long as the optical axis of the light emitting component 20 is not on the same straight line as the optical axis of the light receiving component 30. These angles will not be listed here. The light to be received by the light receiving component 30 is the light emitted by the light receiving component 30 that has been diffracted and reflected by the oil fume particles 70. A large portion of the remaining light emitted by the light emitting component 20 still moves along the emission direction of the light emitting component 20. Therefore, placing the light trap cavity 41 on the optical axis of the light emitting component 20 can achieve better light absorption.

[0054] Understandably, the opening of the light trap cavity 41 should face the light emitting component 20.

[0055] Please see Figure 1 and Figure 3 In some embodiments, an angle is formed between the optical axis of the light emitting component 20 and the optical axis of the light receiving component 30, and the cone-shaped apex of the light trap cavity 41 is located on the optical axis of the light receiving component 30 and the light trap cavity 41 is symmetrical about the optical axis of the light receiving component 30.

[0056] Normally, the cavity wall on the optical axis of the light receiving component 30 can more easily reflect light onto the light receiving component 30. Therefore, this setting can effectively absorb light that may be reflected onto the light receiving component 30, thereby reducing the error in judging the concentration of oil fumes.

[0057] Specifically, the opening of the light trap cavity 41 should face the light receiving component 30.

[0058] Please see Figure 1 In some embodiments, the cavity wall of the light trap cavity 41 is provided with several protruding strips 50 with an arc-shaped cross section.

[0059] This design increases the length of the cavity wall of the light trap cavity 41, enabling it to absorb light more effectively.

[0060] Specifically, the number of raised strips 50 can be varied, including 5, 10, 15, 20, etc., and no specific limit is made here.

[0061] The rib 50 and the cavity wall of the light trap cavity 41 can be an integral structure. For example, the rib 50 and the light trap component 40 can be integrally injection molded, or the rib 50 and the light trap component 40 can be integrally machined. This arrangement simplifies the production of the rib 50 and the light trap component 40.

[0062] The protrusions 50 and the cavity walls of the light trap 41 can be separate components. For example, the protrusions 50 can be bonded to the light trap component 40, or the protrusions 50 can be snapped onto the light trap component 40. This arrangement allows for adjustment of the number and arrangement of protrusions 50 on each light trap component 40 as needed, making production and application more flexible.

[0063] There are many ways to arrange the protrusions 50 on the cavity wall of the optical trap cavity 41. Multiple protrusions 50 can cover the cavity wall of the optical trap cavity 41 together, or multiple protrusions 50 can be evenly distributed on the cavity wall of the optical trap cavity 41 with gaps between adjacent protrusions 50, or multiple protrusions 50 can be unevenly distributed on the cavity wall of the optical trap cavity 41. No specific restrictions are made here.

[0064] It is understandable that the cavity wall of the light trap cavity 41 may also be provided with protruding strips 50 with cross-sections in the shape of trapezoids, triangles, etc., which will not be described in detail here.

[0065] In some implementations, please refer to Figure 1 The cavity wall of the light detection cavity 13 may be provided with semi-circular protrusions 131 to enhance the light absorption effect of the cavity wall of the light detection cavity 13.

[0066] In some embodiments, the roughness of the cavity wall of the optical trap cavity 41 is greater than or equal to 12.5 micrometers.

[0067] With this configuration, the rough walls of the light trap cavity 41 can better absorb light.

[0068] Specifically, the roughness of the cavity wall of the optical trap cavity 41 can be 12.5 micrometers, 13 micrometers, 15 micrometers, etc., which will not be listed here.

[0069] In some embodiments, the cavity wall of the light trap cavity 41 is black.

[0070] This configuration effectively increases the light absorption efficiency of the light trap cavity 41.

[0071] Specifically, black is the color with the best light absorption effect among all colors. Therefore, setting the cavity wall of the light trap cavity 41 to black can better absorb light of various wavelengths.

[0072] Please see Figure 2 and Figure 3 In some embodiments, the area between the air inlet 11 and the air outlet 12 of the light detection cavity 13 forms a light detection region 14, and the optical axis of the light emitting component 20 passes through the light detection region 14, and the optical axis of the light receiving component 30 also passes through the light detection region 14.

[0073] With this configuration, the light receiving component 30 can more easily receive the light that has been affected by the oil fume particles 70, thus making the detection of the oil fume particles 70 more sensitive.

[0074] Specifically, the air inlet 11 and the air outlet 12 can be arranged opposite each other, that is, the center of the air inlet 11 and the center of the air outlet 12 are on the same straight line. In this case, the light detection area 14 can be cylindrical. In this way, the gas containing oil fume particles 70 can enter the light detection cavity 13 through the air inlet 11 and can be discharged from the air outlet 12 relatively quickly, reducing the probability of the gas containing oil fume particles 70 escaping in the light detection cavity 13, thereby reducing the probability of oil fume particles 70 condensing in the light detection cavity 13 and contaminating the light detection cavity 13. The optical axis of the light receiving component 30 and the optical axis of the light emitting component 20 can both pass through the axis of the light detection area 14, which makes it easier for the light receiving component 30 to receive light.

[0075] For further details, please refer to Figure 3 The light emitting assembly 20 includes a light emitting unit 21 and a light emitting lens 22. The light emitting unit 21 is located at the focal point of the light emitting lens 22. The light emitted by the light emitting unit 21 passes through the light emitting lens 22 and enters the light detection area 14.

[0076] With this configuration, the light emitted by the light emitter 21 is refracted by the light emitting lens 22 and emitted in the form of parallel light, resulting in more uniform detection.

[0077] Specifically, the top cover, bottom shell, and light emitting lens 22 can together form an emitter housing cavity to accommodate the light emitter 21. The light emitter 21 emits light to the light detection area 14 through the light emitting lens 22. The light emitting lens 22 blocks the oil fumes in the light detection area 14 outside the emitter housing cavity, protecting the light emitter 21 from contact with the oil fume particles 70, preventing the oil fume particles 70 from contacting and contaminating the light emitter 21, thereby extending the service life of the light emitter 21.

[0078] It is understandable that the light-emitting lens 22 is a convex lens.

[0079] Please see Figure 3 In some embodiments, the light receiving component 30 includes a light receiver 31 and a light receiving lens 32, with the light receiver 31 located at the focal point of the light receiving lens 32, and the light receiver 31 receiving light through the light receiving lens 32.

[0080] With this configuration, the light received by the light receiver 31 is processed by the light receiving lens 32, so that the light from all directions can converge at the focal point of the light receiving lens 32, that is, the position of the light receiver 31. Thus, without changing the position of the light receiver 31, the receiving range of the light receiver 31 is increased, and the sensitivity of the light receiver 31 to changes in light is improved.

[0081] Specifically, the top cover, bottom shell, and light receiving lens 32 can be together arranged to form a receiver receiving cavity for accommodating the light receiver 31. The light receiver 31 receives light from the light detection area 14 through the light receiving lens 32. The light receiving lens 32 blocks the oil fumes from the light detection area 14 outside the receiver receiving cavity, protecting the light receiver 31 from contact with the oil fume particles 70, preventing the oil fume particles 70 from contacting and contaminating the light emitter 21, thereby extending the service life of the light receiver 31.

[0082] Please see Figure 5 The present invention also provides a kitchen appliance 1000, which includes, but is not limited to, range hoods, integrated cooktops, and other appliances with fume extraction functions. The kitchen appliance 1000 includes an appliance housing 200, a fan assembly 300, and a fume sensor 100. The fan assembly 300 is installed inside the appliance housing 200. The fume sensor 100 is installed in the appliance housing 200.

[0083] The kitchen appliance 1000 of this invention forms a light trapping cavity 41 by setting a light trapping element 40, so that the light emitted into the light trapping cavity 41 can be reflected multiple times in the conical light trapping cavity 41 and finally absorbed by the light trapping element 40, which reduces the probability that the light receiving component 30 receives the light reflected from the cavity wall of the light detection cavity 13, and effectively eliminates the error of the light receiving component 30 in detecting the concentration of oil fumes.

[0084] Specifically, the kitchen appliance 1000 of this application includes, but is not limited to, a baffle assembly and a check valve. The appliance housing 200 is mounted on the baffle assembly. The baffle assembly has a smoke collection chamber and multiple function buttons. The smoke collection chamber contains an oil filter and a top plate. The multiple function buttons allow users to input operating commands. A fan assembly 300 is housed within the appliance housing 200. The fan assembly 300 includes a volute, a fan, an air inlet, and an air outlet. The fan is housed within the volute, which forms a volute air duct. The air inlet allows oil fumes to enter the fan assembly 300, and the air outlet connects to the volute air duct to exhaust the oil fumes from the fan assembly 300. A check valve is connected to the top of the appliance housing 200, and a check valve air duct is formed within the check valve. It is understood that a check valve is a valve whose opening and closing element is a circular valve disc that relies on its own weight and the pressure of the medium to prevent backflow of the medium. The check valve can be a lift check valve or a swing check valve.

[0085] In some embodiments, the exhaust port 12 of the fume sensor 100 faces the air inlet of the fan assembly 300, and the air inlet 11 of the fume sensor 100 is spaced apart from the air inlet of the fan assembly 300.

[0086] Thus, after the fan assembly 300 operates, a pressure difference is generated between the air outlet 12 and the air inlet 11 of the oil fume sensor 100, causing the airflow carrying oil fumes to enter the air inlet chamber under the action of the pressure difference.

[0087] Specifically, the air inlet 11 of the fume sensor 100 is spaced from the air inlet of the fan assembly 300, but under the action of the fan assembly 300, it can have a certain negative pressure relative to atmospheric pressure, for example, -5Pa. Under the action of the fan assembly 300, the air outlet 12 of the fume sensor 100 can have a negative pressure of approximately -30Pa relative to atmospheric pressure, thereby creating a pressure difference of approximately 25Pa between the air inlet 11 and the air outlet 12, which in turn drives the movement of the gas containing oil fumes.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An oil fume sensor, characterized in that, include: A sensor housing, the sensor housing including an air inlet, an air outlet and a light detection cavity, the air inlet and the air outlet being connected to the light detection cavity; A light emitting component is used to emit light into the light detection cavity; A light receiving component, used to receive light emitted by the light emitting component; A plurality of optical trapping devices are disposed within the optical detection cavity. Each optical trapping device has an optical trapping cavity to eliminate light emitted into the optical trapping cavity. An angle is formed between the optical axis of the optical emitting component and the optical axis of the optical receiving component. The conical apex of the optical trapping cavity is located on the optical axis of the optical emitting component, and the optical trapping cavity is symmetrical about the optical axis of the optical emitting component.

2. The oil fume sensor according to claim 1, characterized in that, The cross-section of the optical trap cavity is conical.

3. The oil fume sensor according to claim 1 or 2, characterized in that, An angle is formed between the optical axis of the light emitting component and the optical axis of the light receiving component. The cone-shaped apex of the light trap cavity is located on the optical axis of the light receiving component, and the light trap cavity is symmetrical about the optical axis of the light receiving component.

4. The oil fume sensor according to claim 1, characterized in that, The cavity wall of the optical trap cavity is provided with several protruding strips with an arc-shaped cross section.

5. The oil fume sensor according to claim 1, characterized in that, The roughness of the cavity wall of the optical trap cavity is greater than or equal to 12.5 micrometers.

6. The oil fume sensor according to claim 1, characterized in that, The walls of the light trap cavity are black.

7. The oil fume sensor according to claim 1, characterized in that, The optical detection cavity is located in the area between the air inlet and the air outlet, forming a optical detection zone. The optical axis of the optical emitting component passes through the optical detection zone, and the optical axis of the optical receiving component also passes through the optical detection zone.

8. The oil fume sensor according to claim 7, characterized in that, The light emitting component includes a light emitter and a light emitting lens. The light emitter is located at the focal point of the light emitting lens, and the light emitted by the light emitter is incident on the light detection area through the light emitting lens.

9. The oil fume sensor according to claim 7, characterized in that, The light receiving component includes a light receiver and a light receiving lens. The light receiver is located at the focal point of the light receiving lens and receives light through the light receiving lens.

10. A kitchen appliance, characterized in that, The kitchen appliances include: Electrical appliance housing; The fan assembly is installed inside the electrical housing; The fume sensor according to any one of claims 1 to 9 is installed in the appliance housing.

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