CN115875702A - Oil smoke sensor and kitchen appliance - Google Patents

Abstract

The invention discloses an oil smoke sensor and a kitchen appliance. The oil smoke sensor includes: the sensor comprises a sensor shell, a sensor cover and a light detection device, wherein the sensor shell comprises a gas inlet, a gas outlet and a light detection cavity; a light emitting assembly for emitting light to the light detection cavity; the light receiving component is used for receiving the light emitted by the light emitting component; the light trap devices are arranged in the light detection cavity and are provided with a plurality of light trap cavities so as to eliminate light rays emitted into the light trap cavities. According to the oil smoke sensor provided by the embodiment of the invention, the light trap component is arranged to form the light trap cavity, so that light emitted to the light trap cavity can be reflected and absorbed in the light trap cavity for multiple times, the probability that the light receiving component receives light reflected by the wall of the light detection cavity is reduced, and the error of the light receiving component in detecting the oil smoke concentration is effectively eliminated.

Description

Oil smoke sensor and kitchen appliance

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to an oil smoke sensor and a kitchen appliance.

Background

The intelligent range hood is a range hood with a certain intelligent adjusting function, and various types of oil smoke sensors are indispensable for ensuring that the intelligent range hood can timely react to oil smoke.

The oil smoke sensor can be equipped with light emission end and light receiving end, when having the oil smoke between light emission end and the light receiving end, can exert an influence to the light receiving end received light to judge oil smoke concentration according to the influence. And partial light emitted by the light emitting end is reflected to the light receiving end by the surrounding shell, so that the measurement result of the light receiving end generates errors, and the oil smoke sensor is difficult to accurately measure the current oil smoke condition.

Disclosure of Invention

The invention provides an oil smoke sensor and a kitchen appliance.

The oil smoke sensor of the embodiment of the invention comprises:

the sensor comprises a sensor shell, a sensor cover and a sensor, wherein the sensor shell comprises an air inlet, an air outlet and an optical detection cavity, and the air inlet and the air outlet are communicated with the optical detection cavity;

a light emitting assembly for emitting light into the light detection cavity;

the light receiving component is used for receiving the light emitted by the light emitting component;

the light detection device comprises a plurality of light trap pieces and a plurality of light detection units, wherein the light trap pieces are arranged in the light detection cavity and are provided with a plurality of light trap cavities so as to eliminate light rays emitted into the light trap cavities.

In some embodiments, the optical trap cavity is tapered in cross-section.

In some embodiments, an angle is formed between an optical axis of the light emitting assembly and an optical axis of the light receiving assembly, the apex of the cone of the optical trap cavity is located on the optical axis of the light emitting assembly and the optical trap cavity is symmetric about the optical axis of the light emitting assembly.

In some embodiments, an angle is formed between an optical axis of the light emitting assembly and an optical axis of the light receiving assembly, the apex of the cone of the optical trap chamber is located on the optical axis of the light receiving assembly and the optical trap chamber is symmetric about the optical axis of the light receiving assembly.

In some embodiments, the cavity wall of the optical trap cavity is convexly provided with a plurality of convex strips with circular arc-shaped cross sections.

In some embodiments, the roughness of the walls of the optical trap cavity is greater than or equal to 12.5 microns.

In some embodiments, the walls of the optical trap chamber are black in color.

In some embodiments, the area of the light detection chamber between the air inlet and the air outlet forms a light detection zone through which the optical axis of the light emitting assembly passes and through which the optical axis of the light receiving assembly also passes.

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

In some embodiments, the light receiving assembly includes a light receiver at a focal point of a light receiving lens and a light receiving lens through which the light receiver receives light.

The present invention also provides a kitchen appliance comprising: an appliance housing; the fan assembly is arranged in the electric appliance shell; the smoke sensor according to the above embodiment is attached to the electric appliance case.

According to the oil smoke sensor and the kitchen appliance, the light trap piece is arranged to form the light trap cavity, so that light which is not received by the light receiving assembly can be reflected and absorbed in the light trap cavity for multiple times, the probability that the light receiving assembly receives 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 smoke concentration is effectively eliminated.

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.

Drawings

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

FIG. 1 is a cross-sectional view of a soot sensor in accordance with an embodiment of the present invention;

fig. 2 is another cross-sectional view of a smoke sensor according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a soot sensor according to an embodiment of the present invention;

FIG. 4 is an enlarged view taken at A in FIG. 3;

fig. 5 is a schematic structural diagram of a kitchen appliance according to an embodiment of the present invention.

The main characteristic reference numbers:

the lampblack sensor comprises a lampblack sensor 100, a sensor shell 10, an air inlet 11, an air outlet 12, a light detection cavity 13, bumps 131, a light detection area 14, a light emitting component 20, a light emitter 21, a light emitting lens 22, a light receiving component 30, a light receiver 31, a light receiving lens 32, a light trap piece 40, a light trap cavity 41, protruding strips 50, fins 60, lampblack particles 70, a kitchen appliance 1000, an appliance shell 200 and a fan component 300.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically, electrically or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1 and fig. 2, an embodiment of the invention provides a soot sensor 100, where the soot sensor 100 includes a sensor housing 10, a light emitting module 20, a light receiving module 30, and a plurality of light trapping elements 40. The sensor housing 10 includes a gas inlet 11, a gas outlet 12, and a light detection chamber 13, and the gas inlet 11 and the gas outlet 12 communicate with the light detection chamber 13. The light emitting assembly 20 is used to emit light into the light detection cavity 13. The light receiving member 30 is used for receiving the light emitted from the light emitting member 20. The light trapping devices 40 are arranged in the light detection cavity 13, and the light trapping devices 40 are provided with light trapping cavities 41 so as to eliminate light rays emitted into the light trapping cavities 41.

According to the lampblack sensor 100 provided by the embodiment of the invention, the light trap part 40 is arranged to form the light trap cavity 41, so that light emitted to the light trap cavity 41 can be reflected and absorbed in the light trap cavity 41 for multiple times, the probability that the light receiving component 30 receives light reflected by the cavity wall of the light detection cavity 13 is reduced, and the error of the light receiving component 30 in detecting lampblack concentration is effectively eliminated.

Specifically, the soot sensor 100 may be a gas particle concentration detecting device, and soot particles 70 generated by a user using the kitchen appliance 1000 are mixed in the gas and enter the soot sensor 100, so that whether the user is cooking can be determined by detecting the gas particle concentration. The gas particle concentration detection device may be of various types, and may be an infrared detection device, a laser detection device, or the like, and is not particularly limited herein.

Taking the oil smoke sensor 100 as an infrared detection device as an example, the oil smoke sensor 100 may further include a main control board, the light emitting component 20 may be configured to emit light to the gas that may be attached with oil smoke, the light receiving component 30 may be configured to receive the light emitted by the light emitting component 20, and the main control board is electrically connected to the light emitting component 20 and the light receiving component 30, so as to control the light emitting component 20 to emit light and determine the oil smoke condition attached to the current gas according to the light information received by the light receiving component 30. It can be understood that the particle size span of the soot particles 70 is 100nm to 10um. The soot particles 70 can cause shadowing, scattering and diffraction of infrared light as they pass over the light path of the light emitting assembly 20. That is, the oil smoke particles 70 affect the intensity of the light received by the light receiving assembly 30, so that the light information obtained by the main control board changes.

The optical axis of the light emitting component 20 and the optical axis of the light receiving component 30 of the infrared detection device may be located on the same straight line, so that the light emitting component 20 and the light receiving component 30 are disposed opposite to each other, at this time, under the condition of no soot particles 70, the light emitted by the light emitting component 20 can be received by the light receiving component 30 without being shielded; in the presence of soot particles 70, the soot particles 70 can cause blocking, scattering, and diffraction of infrared light rays such that a portion of the light emitted by the light emitting assembly 20 cannot be received by the light receiving assembly 30. Thus, the light trap member 40 is arranged, so that under the condition of no oil smoke particles 70, the light ray information of the light receiving component 30 can be measured accurately, and under the condition of oil smoke particles 70, the light which is not scattered to the light receiving component 30 can be absorbed, so that the light received by the light receiving component 30 is mainly influenced by the oil smoke particles 70.

An included angle may be formed between an optical axis of the light emitting component 20 and an optical axis of the light receiving component 30 of the infrared detection apparatus, and at this time, in the case of no soot particles 70, the light emitted by the light emitting component 20 cannot be received by the light receiving component 30; in the presence of soot particles 70, the soot particles 70 can cause the blocking, scattering and diffraction of infrared light rays so that a portion of the light emitted by the light emitting assembly 20 can be received by the light receiving assembly 30. In this way, the light trapping element 40 is arranged to absorb the light emitted by the light emitting element 20 without soot particles 70, so as to prevent the light receiving element 30 from receiving the reflected light and generating errors in the light information; in the presence of soot particles 70, light that is not scattered to light-receiving assembly 30 may be absorbed such that light received by light-receiving assembly 30 is mainly affected by soot particles 70.

The main control board can be further provided with a communication module, the communication module can be connected with mobile terminals such as a mobile phone, a tablet and a computer, a user can conveniently control the oil smoke sensor 100 to work, the communication module can also be electrically connected or in communication connection with other components of the kitchen appliance 1000, so that the oil smoke sensor 100 can be turned on or turned off according to the state of the switch component of the kitchen appliance 1000, and the motor component can be turned on or turned off or the power of the fan component 300 can be increased or reduced according to the detection result of the oil smoke sensor 100.

The sensor housing 10 may include a bottom case and an upper cover, the air inlet 11 is disposed on the bottom case, the air outlet 12 is disposed on the upper cover, and the bottom case and the upper cover jointly enclose to form the light detection cavity 13. The bottom shell and the upper cover can be connected in a plurality of ways, for example, the bottom shell and the upper cover can be connected through threads, in one embodiment, the periphery of the bottom shell is provided with a threaded protrusion, the inner edge of the upper cover is provided with a threaded groove matched with the threaded protrusion, the cross sections of the bottom shell and the upper cover are both circular, and the upper cover rotates relative to the bottom shell to realize the installation and the disassembly of the upper cover and the bottom shell, so that the upper cover and the bottom shell can be detachably connected, the installation, the disassembly and the maintenance of each component in the light detection cavity 13 are convenient, and in addition, external oil smoke particles 70 are difficult to enter the light detection cavity 13 through the connection part of the upper cover and the bottom shell; if the connection between the bottom shell and the upper cover is realized through the matching of the buckle and the through hole, in one embodiment, the buckle is convexly arranged on the upper cover, the through hole matched with the buckle is arranged on the bottom shell, and the buckle and the through hole are buckled to realize the connection between the bottom shell and the upper cover, so that the connection is not performed in one row.

The sensor housing 10 may further include a plurality of fins 60, and the plurality of fins 60 are respectively installed at the bottom case and the upper cover and located in the light detection chamber 13. One end of the fin 60 may be provided with a semicircular through hole, and the fin 60 installed at the bottom case and the fin 60 installed at the upper cover may be spliced together along with the connection of the bottom case and the upper cover to form a circular through hole. In this manner, the light emitted from the light emitting module 20 or the light received by the light receiving module 30 can be shaped by the circular through-hole. In addition, every fin 60 only sets up semi-circular through-hole, forms circular through-hole through piecing together two fins 60, can make things convenient for the production and the drawing of patterns of fin 60 for production efficiency.

The shapes of the light trapping elements 40 are various, and may be rectangular parallelepiped, conical, etc., and no specific limitation is imposed herein, and the shapes of the plurality of light trapping elements 40 may be the same or different, and thus are not described herein in detail.

It should be noted that there are many ways for the light trap member 40 to be provided with the light trap cavity 41, and the light trap member 40 may be concavely provided with a groove, the groove forms the light trap cavity 41, or the light trap member 40 and the cavity wall of the light detection cavity 13 are spliced to form the light trap cavity 41 together, or a plurality of light trap members 40 are spliced to form the light trap cavity 41 together, which is not limited herein.

It should be noted that the light trapping element 40 may be configured to eliminate light emitted into the light trapping cavity 41, either to attenuate light or to absorb light, so long as the intensity or probability of light being reflected into the light detecting cavity 13 is reduced.

Referring to fig. 1, 3 and 4, in some embodiments, the optical trap cavity 41 is tapered in cross-section.

So configured, after entering the light trap cavity 41, the light can be reflected back and forth on both sides of the taper until it is absorbed by the walls of the light trap cavity 41.

Specifically, the opening of the cone should face a direction in which light emitted from the light emitting assembly 20 may possibly enter, the angle between two sides of the cone may be (0, 90), and the specific angle between two sides of the cone is adjusted according to actual needs, and is not limited specifically herein. It can be understood that the angle between the two sides of the cone is smaller, so that the effects of reflecting light and absorbing light are better; the larger the angle between the two sides of the cone, the easier the light enters the trap cavity 41, is reflected and absorbed by the trap cavity 41.

It should be noted that the soot sensor 100 may include a plurality of optical trap cavities 41, and the cross sections of the optical trap cavities 41 may be all conical, and at this time, the angles between two sides of the conical shape of each optical trap cavity 41 may be all the same, may also be different, and may also be partially the same and partially different. The cross section of the light splitting trap cavity 41 inside the plurality of light trap cavities 41 may be conical, and the cross section of the partial light trap cavity 41 may be other shapes, which is not limited herein.

Referring to fig. 1, 3 and 4, in some embodiments, the optical axis of the light emitting element 20 and the optical axis of the light receiving element 30 form an included angle, the vertex of the cone of the optical trap chamber 41 is located on the optical axis of the light emitting element 20, and the optical trap chamber 41 is symmetrical with respect to the optical axis of the light emitting element 20.

With this arrangement, the light emitted from the light emitting element 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 in the light trap cavity 41, thereby achieving a better light absorption effect.

Specifically, the included angle between the optical axis of the light emitting module 20 and the optical axis of the light receiving module 30 is many, and may be an angle of 30 °, 45 °, 60 °, 90 °, 120 °, etc., as long as the optical axis of the light emitting module 20 and the optical axis of the light receiving module 30 are not located on the same straight line, which is not limited herein. The light ray that the light receiving module 30 needs to receive is the light ray that the light receiving module 30 emits, diffracts, reflects to the light receiving module under the influence of the oil smoke particles 70, and a large part of the light ray that the remaining light emitting module 20 emits still moves along the emitting direction of the light emitting module 20, so that the light trap cavity 41 is disposed on the optical axis of the light emitting module 20, and the better light ray absorption effect can be achieved.

It will be appreciated that the opening of the light trap cavity 41 should be towards the light emitting assembly 20.

Referring to fig. 1 and 3, in some embodiments, an angle is formed between the optical axis of the light emitting element 20 and the optical axis of the light receiving element 30, the vertex of the cone of the light trap chamber 41 is located on the optical axis of the light receiving element 30, and the light trap chamber 41 is symmetrical with respect to the optical axis of the light receiving element 30.

In general, the cavity wall on the optical axis of the light receiving element 30 reflects the light to the light receiving element 30 more easily, so that the light reflected to the light receiving element 30 can be effectively absorbed, thereby reducing the error of determining the oil smoke concentration.

Specifically, the opening of the light trap cavity 41 should be directed toward the light receiving member 30.

Referring to fig. 1, in some embodiments, the walls of the optical trap chamber 41 are protruded with a plurality of ribs 50 having a circular arc-shaped cross section.

With the arrangement, the length of the cavity wall of the optical trap cavity 41 is increased, and light can be absorbed more effectively.

Specifically, the number of the convex strips 50 is many, and may be 5, 10, 15, 20, and the like, and is not limited in particular.

The rib 50 and the cavity wall of the light trap cavity 41 may be formed as a single structure, for example, the rib 50 and the light trap member 40 are formed by injection molding, or the rib 50 and the light trap member 40 are formed by cutting together. With this arrangement, the production of the convex strip 50 and the light trapping element 40 can be made simple.

The protruding strip 50 and the cavity wall of the light trap cavity 41 may be provided separately, for example, the protruding strip 50 is adhered to the light trap member 40, and as another example, the protruding strip 50 is clamped on the light trap member 40. So set up, can adjust the sand grip 50 quantity and the sand grip 50 on every light trap piece 40 to arrange as required for production and application are more nimble.

The arrangement of the protruding strips 50 on the cavity wall of the optical trap cavity 41 is many, a plurality of protruding strips 50 may cover the cavity wall of the optical trap cavity 41 together, a plurality of protruding strips 50 may be uniformly distributed on the cavity wall of the optical trap cavity 41 with a gap left between two adjacent protruding strips 50, and a plurality of protruding strips 50 may be non-uniformly distributed on the cavity wall of the optical trap cavity 41, which is not limited herein.

It can be understood that the cavity wall of the optical trap cavity 41 may also be protruded with a protruding strip 50 having a trapezoidal, triangular, etc. cross section, which is not described herein again.

In some embodiments, referring to fig. 1, the cavity wall of the light detecting cavity 13 may be protruded with a semicircular bump 131 to enhance the light absorption effect of the cavity wall of the light detecting cavity 13.

In some embodiments, the roughness of the walls of the optical trap cavity 41 is greater than or equal to 12.5 microns.

So arranged, the rough cavity wall of the optical trap cavity 41 can absorb light better.

Specifically, the roughness of the wall of the optical trap cavity 41 may be 12.5 microns, 13 microns, 15 microns, etc., which are not necessarily enumerated herein.

In some embodiments, the walls of the light trap chamber 41 are black in color.

By such arrangement, the light absorption efficiency of the light trap cavity 41 is effectively increased.

Specifically, black is the color with the best light absorption effect among the colors, and therefore, the light rays with various wavelengths can be absorbed well by setting the cavity wall of the light trap cavity 41 to black.

Referring to fig. 2 and 3, in some embodiments, the area of the light detection cavity 13 between the air inlet 11 and the air outlet 12 forms a light detection area 14, the optical axis of the light emitting assembly 20 passes through the light detection area 14, and the optical axis of the light receiving assembly 30 also passes through the light detection area 14.

So set up, light receiving element 30 can receive the light that has acted on at oil smoke granule 70 more easily to the detection to oil smoke granule 70 is more sensitive.

Specifically, the air inlet 11 and the air outlet 12 may be disposed opposite to each other, that is, the center of the air inlet 11 and the center of the air outlet 12 are located on the same straight line, and the photodetection region 14 may be cylindrical. In this way, after the gas with the soot particles 70 can enter the light detection cavity 13 from the gas inlet 11, the gas can be rapidly discharged from the gas outlet 12, so that the probability of the gas with the soot particles 70 escaping from the light detection cavity 13 is reduced, and the probability of the soot particles 70 agglutinating in the light detection cavity 13 and polluting the light detection cavity 13 is reduced. The optical axis of the light receiving element 30 and the optical axis of the light emitting element 20 may both pass through the axis of the light detection region 14, so that the light receiving element 30 can receive light more conveniently.

Further, referring to fig. 3, the light emitting assembly 20 includes a light emitter 21 and a light emitting lens 22, the light emitter 21 is located at a focal point of the light emitting lens 22, and light emitted by the light emitter 21 is incident on the light detecting section 14 through the light emitting lens 22.

So arranged, the light emitted by the light emitter 21 can be emitted in the form of parallel light through the light emitting lens 22, so that the detection is more uniform.

Specifically, upper cover, drain pan and light emission lens 22 can enclose jointly and establish the transmitter that forms and hold light emitter 21 and hold the chamber, and light emitter 21 passes through light emission lens 22 and launches light to light detection zone 14, and light emission lens 22 blocks the oil smoke in light detection zone 14 and holds the chamber outside the transmitter, protects light emitter 21 not to contact with oil smoke granule 70, avoids oil smoke granule 70 to contact and pollutes light emitter 21 to light emitter 21's life has been increased.

It will be appreciated that the light emitting lens 22 is a convex lens.

Referring to fig. 3, in some embodiments, the light receiving assembly 30 includes a light receiver 31 and a light receiving lens 32, the light receiver 31 is located at a focal point of the light receiving lens 32, and the light receiver 31 receives light through the light receiving lens 32.

So set up, light that light receiver 31 received is through the arrangement of light receiving lens 32 for the light of all directions can meet in light receiving lens 32's focus, light receiver 31's position promptly, thereby under the unchangeable circumstances of light receiver 31, has increased light receiver 31's receiving range, has improved light receiver 31 to the sensitivity of light change.

Specifically, the upper cover, drain pan and light receiving lens 32 can enclose jointly and establish the receiver that forms and hold light receiver 31 and hold the chamber, light receiver 31 receives the light of photodetection region 14 through light receiving lens 32, light receiving lens 32 blocks the oil smoke of photodetection region 14 outside the chamber is held to the receiver, protection light receiver 31 does not contact with oil smoke granule 70, avoid oil smoke granule 70 to contact and pollute light emitter 21, thereby the life of light receiver 31 has been increased.

Referring to fig. 5, the present invention further provides a kitchen appliance 1000, wherein the kitchen appliance 1000 includes, but is not limited to, a range hood, an integrated stove, and other appliances with a function of discharging oil smoke. The kitchen appliance 1000 includes an appliance housing 200, a fan assembly 300, and a smoke sensor 100. The blower assembly 300 is installed in the appliance case 200. The soot sensor 100 is installed at the appliance case 200.

According to the kitchen appliance 1000 in the embodiment of the invention, the light trap member 40 is arranged to form the light trap cavity 41, so that light emitted to the light trap cavity 41 can be reflected for multiple times in the tapered light trap cavity 41 and is finally absorbed by the light trap member 40, the probability that the light receiving component 30 receives light reflected by the cavity wall of the light detection cavity 13 is reduced, and the error of the light receiving component 30 in detecting the oil smoke concentration is effectively eliminated.

In particular, the kitchen appliance 1000 of the present embodiment includes, but is not limited to, a baffle assembly, a check valve. The appliance case 200 is disposed on the guide plate assembly. The guide plate component is provided with a smoke collecting cavity and a plurality of function keys, an oil screen and a top plate are arranged in the smoke collecting cavity, and the function keys can be used for a user to input operation instructions. A fan assembly 300 is disposed in the electrical appliance housing 200, and the fan assembly 300 includes a volute, a fan, an air inlet, and an air outlet. The fan is arranged in the volute, and a volute air channel is formed in the volute. The air inlet is used for supplying oil smoke to enter the fan assembly 300, and the air outlet is communicated with the volute air channel and discharges the oil smoke out of the fan assembly 300. A check valve is connected to the top of the appliance housing 200, and a check valve air passage is formed in the check valve. It is understood that the check valve is a valve in which the opening and closing member is a circular valve flap and acts by its own weight and pressure of the medium to block the reverse flow of the medium. The check valve may be a lift check valve and a swing check valve.

In some embodiments, the air outlet 12 of the smoke sensor 100 faces the air inlet of the fan assembly 300, and the air inlet 11 of the smoke sensor 100 is spaced from the air inlet of the fan assembly 300.

In this way, the air outlet 12 and the air inlet 11 of the soot sensor 100 generate a pressure difference after the blower assembly 300 is operated, so that the airflow with soot enters the air inlet chamber under the action of the pressure difference.

Specifically, the air inlet 11 of the smoke sensor 100 is spaced from the air inlet of the fan assembly 300, but under the action of the fan assembly 300, a certain negative pressure, for example-5 Pa, can be provided with respect to the atmospheric pressure. The air outlet 12 of the smoke sensor 100 can have a negative pressure of about-30 Pa with respect to the atmospheric pressure under the action of the fan assembly 300, so that a pressure difference of about 25Pa is formed between the air inlet 11 and the air outlet 12, thereby pushing the air with the smoke to move.

In the description of the present specification, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples", etc., means that a particular 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, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art may make variations, modifications, substitutions and alterations to the above embodiments within the scope of the present invention.

Claims (11)

1. A soot sensor, comprising:

the sensor comprises a sensor shell, a sensor cover and a sensor, wherein the sensor shell comprises an air inlet, an air outlet and an optical detection cavity, and the air inlet and the air outlet are communicated with the optical detection cavity;

a light emitting assembly for emitting light into the light detection cavity;

a light receiving component for receiving the light emitted by the light emitting component;

and the light trap pieces are arranged in the light detection cavity and are provided with light trap cavities so as to eliminate light rays emitted into the light trap cavities.

2. The soot sensor of claim 1, wherein said optical trap cavity is tapered in cross-section.

3. The soot sensor of claim 2, wherein an angle is formed between the optical axis of the light emitting module and the optical axis of the light receiving module, the tapered apex of the optical trap cavity is located on the optical axis of the light emitting module and the optical trap cavity is symmetric about the optical axis of the light emitting module.

4. The soot sensor of claim 2 or 3, wherein an angle is formed between an optical axis of the light emitting module and an optical axis of the light receiving module, a vertex of the cone of the light trap cavity is located on the optical axis of the light receiving module and the light trap cavity is symmetrical with respect to the optical axis of the light receiving module.

5. The soot sensor of claim 1, wherein the wall of said optical trap chamber is provided with a plurality of convex strips having a circular arc-shaped cross section.

6. The soot sensor of claim 1, wherein a roughness of a wall of said optical trap cavity is greater than or equal to 12.5 microns.

7. The soot sensor of claim 1, wherein a wall of said optical trap chamber is colored black.

8. The smoke sensor of claim 1, wherein the area of the light detection chamber between the air inlet and the air outlet forms a light detection zone through which the optical axis of the light emitting assembly passes and through which the optical axis of the light receiving assembly also passes.

9. The soot sensor of claim 8, wherein said light emitting assembly comprises a light emitter and a light emitting lens, said light emitter being located at a focal point of said light emitting lens, light emitted by said light emitter being incident on said light detection region through said light emitting lens.

10. The soot sensor of claim 8, wherein the light receiving assembly comprises a light receiver and a light receiving lens, the light receiver being located at a focal point of the light receiving lens, the light receiver receiving light through the light receiving lens.

11. A kitchen appliance, characterized in that it comprises:

an appliance housing;

the fan assembly is arranged in the electric appliance shell;

the smoke sensor of any one of claims 1 to 10 mounted to the appliance housing.

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