CN110617535B

CN110617535B - Kitchen device

Info

Publication number: CN110617535B
Application number: CN201910912619.2A
Authority: CN
Inventors: 刘玉磊
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2021-03-19
Anticipated expiration: 2039-09-25
Also published as: CN110617535A

Abstract

The invention discloses a kitchen device. Kitchen device includes fan subassembly and oil smoke determine module, the fan subassembly includes the spiral case and establishes the fan in the spiral case, kitchen device is including being located the oil smoke wind channel of fan low reaches, oil smoke determine module sets up the oil smoke wind channel in the fan low reaches, oil smoke determine module includes light emitting device and light receiving device, light emitting device is used for to oil smoke wind channel emission light, light receiving device is used for receiving the light of light emitting device transmission and according to the light output signal of telecommunication that receives, the central axis of the air outlet of spiral case is located between the axis of rotation of the impeller of light receiving device and fan, or the central axis of the air outlet of spiral case is located between the axis of rotation of the impeller of light emitting device. The kitchen device can cause the light intensity received by the light receiving device to be obviously changed when the concentration of the oil smoke particles in the oil smoke air channel is slightly changed, namely, the sensitivity of the oil smoke detection assembly is improved.

Description

Kitchen device

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to a kitchen device.

Background

In the related art, the concentration of oil smoke is constantly changing when a user cooks, and in a general case, an oil smoke suction device includes an oil smoke sensor, and the oil smoke sensor is disposed in an oil smoke duct of the oil smoke suction device.

Disclosure of Invention

The embodiment of the invention provides a kitchen device.

The kitchen device of the embodiment of the invention comprises a box body and an oil smoke detection component, wherein a fan component is arranged in the box body, the fan assembly comprises a volute and a fan arranged in the volute, the kitchen device comprises an oil smoke air duct positioned at the downstream of the fan, the oil smoke detection component is arranged in an oil smoke air channel at the downstream of the fan and comprises a light emitting device and a light receiving device, the light emitting device is used for emitting light to the lampblack air channel, the light receiving device is used for receiving the light emitted by the light emitting device and outputting an electric signal according to the received light, the central axis of the air outlet of the volute is positioned between the light receiving device and the rotation axis of the impeller of the fan, or the central axis of the air outlet of the volute is positioned between the light emitting device and the rotation axis of the impeller of the fan.

In the kitchen device of the above embodiment, the central axis of the air outlet of the volute is located between the light receiving device and the rotation axis of the impeller of the fan, or the central axis of the air outlet of the volute is located between the light emitting device and the rotation axis of the impeller of the fan, so that under the condition that the concentration of the lampblack particles in the lampblack air channel slightly changes, the light intensity received by the light receiving device can be obviously changed, that is, the sensitivity of the lampblack detection assembly is improved.

In some embodiments, the central axis of the light emitting device and the central axis of the light receiving device intersect with the central axis of the cooking fume duct, and the central axis of the light emitting device and the central axis of the light receiving device are located on the same line or different lines. So, realize the installation of oil smoke determine module and to the detection of the oil smoke concentration of oil smoke granule.

In some embodiments, a plane formed by the central axis of the light emitting device and the central axis of the light receiving device is parallel or inclined with respect to a plane perpendicular to the central axis of the cooking fume duct. So, realize the installation of oil smoke determine module and to the detection of the oil smoke concentration of oil smoke granule.

In some embodiments, the light emitting device includes a first sealing plug mounted on the first circuit board, an emitting portion formed with a first inner cavity, and a first circuit board on which the emitting portion is located; and the light receiving device comprises a second sealing plug, a receiving part and a second circuit board, the second sealing plug is installed on the second circuit board, a second inner cavity is formed in the second sealing plug, and the receiving part is located in the second inner cavity and arranged on the second circuit board. Therefore, the transmitting part and the receiving part are positioned in the inner cavity, the adverse effect of oil smoke particles on the transmitting part and the receiving part can be reduced, and the service lives of the transmitting part and the receiving part are prolonged.

In some embodiments, the light emitting device includes a first sealing plug mounted on the first circuit board, an emitting portion formed with a first inner cavity, and a first circuit board on which the emitting portion is located; or the light receiving device comprises a second sealing plug, a receiving part and a second circuit board, the second sealing plug is installed on the second circuit board, a second inner cavity is formed in the second sealing plug, and the receiving part is located in the second inner cavity and arranged on the second circuit board. Therefore, the transmitting part or the receiving part is positioned in the inner cavity, the adverse effect of the oil smoke particles on the transmitting part or the receiving part can be reduced, and the service life of the transmitting part or the receiving part is prolonged.

In some embodiments, one end of the first inner cavity is formed with a first paraboloid, and the emitting part is located at the focus position of the first paraboloid; and a second paraboloid is formed at one end of the second inner cavity, and the receiving part is positioned at the focal point of the second paraboloid. Thus, the efficiency of the transmitting portion for transmitting light and the receiving portion for receiving light can be improved.

In some embodiments, one end of the first inner cavity is formed with a first paraboloid, and the emitting part is located at the focus position of the first paraboloid; or a second paraboloid is formed at one end of the second inner cavity, and the receiving part is positioned at the focal point of the second paraboloid. Thus, the efficiency of the transmitting part for transmitting light or the receiving part for receiving light can be improved.

In some embodiments, the light emitting device includes a first lens disposed in the first inner cavity and located on a light emitting path of the emitting portion, and the first lens is configured to emit light emitted from the emitting portion in parallel; and the light receiving device comprises a second lens, the second lens is arranged in the second inner cavity and positioned on the receiving light path of the receiving part, and the second lens is used for converging the light entering from the second inner cavity to the receiving part. Thus, the efficiency of the transmitting portion for transmitting light and the receiving portion for receiving light can be improved.

In some embodiments, the light emitting device includes a first lens disposed in the first inner cavity and located on a light emitting path of the emitting portion, and the first lens is configured to emit light emitted from the emitting portion in parallel; or the light receiving device comprises a second lens, the second lens is arranged in the second inner cavity and positioned on the receiving light path of the receiving part, and the second lens is used for converging the light entering from the second inner cavity to the receiving part. Thus, the efficiency of the transmitting part for transmitting light or the receiving part for receiving light can be improved.

In some embodiments, a first shielding part located at the front end of the emitting part is arranged on the inner wall of the first inner cavity; and a second shielding part positioned at the front end of the receiving part is arranged on the inner wall of the second inner cavity. Therefore, the adverse effect of the oil smoke particles on the transmitting part and the receiving part is further reduced, and the service lives of the transmitting part and the receiving part are prolonged.

In some embodiments, a first shielding part located at the front end of the emitting part is arranged on the inner wall of the first inner cavity; or a second shielding part positioned at the front end of the receiving part is arranged on the inner wall of the second inner cavity. Therefore, the adverse effect of the oil smoke particles on the transmitting part or the receiving part is further reduced, and the service life of the transmitting part or the receiving part is prolonged.

In some embodiments, the inner wall of the first inner cavity is provided with a first oil guide groove connected with the first shielding part; and a second oil guide groove connected with the second shielding part is formed in the inner wall of the second inner cavity. Therefore, the condensed materials in the inner cavity can flow away smoothly through the oil guide groove, and the service life of the transmitting part and the service life of the receiving part are prevented from being influenced by the accumulation of the condensed materials.

In some embodiments, the inner wall of the first inner cavity is provided with a first oil guide groove connected with the first shielding part; or the inner wall of the second inner cavity is provided with a second oil guide groove connected with the second shielding part. Therefore, the condensed materials in the inner cavity can flow away smoothly through the oil guide groove, and the phenomenon that the accumulation of the condensed materials affects the service life of the transmitting part or the receiving part is avoided.

In some embodiments, the light emitting device includes a first sealing plug, one end of the first sealing plug is opened with a transmitting opening, and the light receiving device includes a second sealing plug, one end of the second sealing plug is opened with a receiving opening, and a diameter of the receiving opening is larger than a diameter of the transmitting opening. Therefore, the receiving part can increase the light receiving, and the sensitivity of the oil smoke detection assembly is improved.

In some embodiments, the kitchen device includes a first fixing portion fixing the light emitting device and a second fixing portion fixing the light receiving device. As such, the first fixing portion plays a role of fixing and protecting the light emitting device, and the second fixing portion plays a role of fixing and protecting the light receiving device.

Additional aspects and advantages of embodiments 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 embodiments 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 schematic view of a kitchen device according to an embodiment of the present invention.

Fig. 2 is another schematic view of a kitchen device according to an embodiment of the present invention.

Fig. 3 is a schematic view of another structure of the kitchen device according to the embodiment of the present invention.

Fig. 4 is a schematic view of a check valve assembly of a kitchen device according to an embodiment of the present invention.

Fig. 5 is a cross-sectional view of the check valve assembly of fig. 4 taken along the direction L-L.

Fig. 6 is an enlarged view of a portion I of fig. 5.

Fig. 7 is an enlarged view of a portion II of fig. 5.

Fig. 8 is a schematic structural diagram of a smoke detection assembly according to an embodiment of the present invention.

Fig. 9 is another schematic structural diagram of the lampblack detection assembly in the embodiment of the invention.

Fig. 10 is a graph of the intensity of light received by the light receiving device of the kitchen device according to the embodiment of the present invention as a function of time.

Fig. 11 is another schematic structural diagram of the lampblack detection assembly according to the embodiment of the invention.

Fig. 12 is another graph of the intensity of light received by the light receiving device of the kitchen device according to the embodiment of the present invention with respect to time.

Fig. 13 is a schematic view of the structure of the first sealing plug of the embodiment of the present invention.

Description of the main element symbols:

the kitchen device 100, the baffle assembly 10, the touch button 12, the box body 20, the top 22, the fan assembly 30, the volute 32, the air outlet 320, the air outlet 321, the fan 34, the check valve assembly 410, the check valve 40, the first through hole 401, the second through hole 402, the lampblack detection assembly 50, the light emitting device 52, the first fixing portion 521, the emitting portion 522, the first convex ring 524, the emitting opening 5282, the dirt discharge hole 529, the light receiving device 54, the second fixing portion 541, the receiving portion 542, the second convex ring 544, the receiving opening 5484, the positioning pin 561, the first sealing plug 562, the first inner cavity 5622, the first end face 5621, the second end face 5623, the second sealing plug 564, the second inner cavity 5642, the third end face 5641, the fourth end face 5643, the first shielding portion 510, the first oil baffle 506, the second shielding portion 520, the second oil baffle 508, the first oil guide groove 507, the second oil guide groove 509, the first light guide hole 5652, the second light guide hole 5654, the second light guide, A first paraboloid 5672, a second paraboloid 5674, a first circuit board 551, a second circuit board 552, a first lens 57, a second lens 58, a wire protection structure 60, a protection box 70, a junction box 80, a wiring port 82 and a housing 84.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.

In addition, the embodiments of the present invention described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a kitchen device 100 according to an embodiment of the present invention, and in the example of fig. 1, the kitchen device 100 is an upper-row kitchen device 100. It is understood that in other embodiments, the kitchen device 100 may be a bottom-up kitchen device 100 or a side-up kitchen device 100, and the like, and is not limited thereto. The following description will be made in detail with the kitchen device 100 as an example of the upper-row kitchen device 100. Specifically, the kitchen device 100 includes, but is not limited to, a range hood, an integrated range, and the like having a range hood function. In the illustrated embodiment, the kitchen appliance 100 is described by taking a range hood as an example. The fume extraction device may be a variable frequency fume extraction device.

The kitchen apparatus 100 according to the embodiment of the present invention includes a baffle assembly 10, a box 20, and a check valve assembly 410, wherein the check valve assembly 410 includes a check valve 40, the box 20 is disposed on the baffle assembly 10, the baffle assembly 10 includes a touch key 12, and after the touch key 12 is triggered, the kitchen apparatus 100 is opened, and the soot particles 110 can enter the box 20 from the baffle assembly 10. A fan assembly 30 is disposed within the housing 20, the fan assembly 30 including a volute 32 and a fan 34 disposed within the volute 32. The soot particles 110 enter the volute 32 by the centrifugal force of the impeller of the fan 34, and the soot particles 110 can be discharged from the air outlet 321 of the volute 32. The check valve 40 is connected to the top 22 of the tank 20 and to the outlet 321 of the volute 32. The soot particles 110 can be discharged from the outlet 321 of the volute 32 and then discharged into the smoke tube or flue through the check valve 40. The kitchen apparatus 100 of the present embodiment may be applied to a variable frequency range hood.

It is understood that the check valve 40 is a valve in which the opening and closing member is a circular flap and operates by its own weight and pressure of the medium to block the reverse flow of the medium. The check valve 40 may be a lift check valve and a swing check valve. In the present embodiment, the soot particles 110 are discharged from the air outlet 321 of the scroll casing 32 and enter the check valve 40, and when the pressure at the inlet of the check valve 40 is greater than the sum of the weight of the flap of the check valve 40 and the rotational resistance thereof, the valve of the check valve 40 is opened. The valve of the check valve 40 is closed when the soot particles 110 flow backward.

The kitchen apparatus 100 according to the embodiment of the present invention includes the smoke detecting unit 50, and the smoke detecting unit 50 is provided in the check valve 40. In the illustrated embodiment, the smoke detecting assembly 50 is provided at an outer wall of the check valve 40. The smoke detecting assembly 50 may be provided at an inner wall of the check valve 40. In the example of fig. 1, the smoke detection assembly 50 is provided at an outer wall of the check valve 40 and is used to detect the smoke concentration of the smoke duct within the check valve 40.

In the present embodiment, the smoke detecting assembly 50 is disposed in the smoke channel downstream of the fan 34, and in the illustrated embodiment, the smoke detecting assembly 50 may be disposed on the inner wall or the outer wall of the air channel 320 of the volute 32. In the example of fig. 3, the smoke detection assembly 50 may be disposed on an outer wall of the volute 32 and used to detect a smoke concentration of a smoke duct within the volute 32. The two detected oil smoke concentrations can be taken as the average value of the two oil smoke concentrations to be used as the oil smoke concentration for controlling the air quantity of the fan 34, and the two detected oil smoke concentrations can also be distributed with different weights or proportions to calculate the oil smoke concentration for controlling the air quantity of the fan 34. In other embodiments, the smoke detection assembly 50 is disposed at the check valve 40 or the volute 32.

Specifically, the smoke detecting element 50 may be an infrared detecting element or a laser detecting element, and the like, which is not limited herein. The following embodiments are described in detail with the lampblack detection component 50 as an infrared detection component.

Referring to fig. 3, the smoke detecting assembly 50 includes a light emitting device 52 and a light receiving device 54. The kitchen unit 100 includes a cooking fume duct located downstream of the fan 34. The smoke detection assembly 50 is disposed in the smoke duct downstream of the fan 34. In the illustrated embodiment, the smoke duct downstream of the fan 34 includes an outlet duct 320 of the volute and a smoke duct within the check valve 40. The light emitting device 52 is used for emitting light to the lampblack air channel of the air outlet channel 320 of the volute 32 and emitting light to the lampblack air channel in the check valve 40, and the light receiving device 54 is used for receiving the light emitted by the light emitting device 52 and outputting an electric signal according to the received light. Typically, the soot particles 110 span a particle size of 100nm to 10 um. In one embodiment, when the soot particles 110 pass through the optical path of the infrared light emitted from the light emitting device 52, the soot particles 110 can block, scatter and diffract the infrared light, that is, the soot particles 110 in the soot duct can affect the intensity of the light emitted from the light emitting device 52 received by the light receiving device 54, so that the electrical signal output by the light receiving device 54 changes, the kitchen device 100 can control the operation of the fan 34 according to the electrical signal, so that the fan 34 can provide a proper amount of air to absorb the soot particles 110, and the effect of absorbing the soot particles 110 is good and the accuracy is high.

Controlling the operation of the fan 34 may be understood as controlling the air volume of the fan 34, and the air volume of the fan 34 is related to the rotational speed of the fan 34. In one example, the corresponding relationship between the smoke concentration and the fan air volume can be established by simulating the actual use scene of the kitchen device 100, and the smoke concentration can be calibrated by the electrical signal output by the light receiving device 54. The corresponding air quantity is achieved through the rotating speed of the fan 34, and the oil smoke absorption effect can be improved.

In the present embodiment, the central axis E of the air outlet 321 of the scroll 32 is located between the light receiving device 54 and the rotation axis F of the impeller of the fan 34. In the example of fig. 3, the central axis E of the air outlet 321 of the scroll 32 is on the left side of the rotation axis F of the impeller of the fan 34 (the rotation axis F of the impeller of fig. 3 is perpendicular to the paper surface), and the light receiving device 54 is located on the left side of the air outlet 321 of the scroll 32, most of the soot particles will be discharged from the left side of the air outlet 321 of the scroll 32 due to the centrifugal force of the soot particles 110 by the impeller of the fan 34, the concentrations of the soot particles 110 on the left side of the air outlet 321 of the scroll 32 and on the left side of the check valve 40 are higher, and the concentrations of the soot particles 110 on the right side of the air outlet 321 of the scroll 32. Thus, in the example of fig. 3, the light receiving device 54 is placed to the left of the outlet opening of the volute and to the left of the check valve 40. Therefore, when the concentration of the oil smoke particles in the oil smoke air duct slightly changes, the light intensity received by the light receiving device 54 can be obviously changed, namely, the sensitivity of the oil smoke detection assembly 50 is improved. It will be appreciated that in other embodiments, the central axis of the air outlet 321 of the volute 32 may also be located between the light emitting device 52 and the axis of rotation of the impeller of the fan 34.

In the example of fig. 9 and 11, the center axis E of the air outlet 321 of the scroll casing 32 (in fig. 9 and 11, the center axis E is perpendicular to the paper surface) is perpendicular to the imaginary line E1, and the imaginary line E1 is parallel to the rotation axis F of the impeller. The broken line E1 divides the check valve 40 into two regions of the left and right, and the light receiving device 54 may be disposed at any position in the circumferential direction of the check valve 40 on the left side of the broken line E1, while the light emitting device 54 may be disposed at any position in the circumferential direction of the check valve 40 on the right side of the broken line E1. In the example of fig. 9, the light receiving device 54 is located to the left of the check valve 40 to the left of the dashed line E1, and the light emitting device 52 is located on the same straight line T as the light receiving device 54.

In the example of fig. 11, the light receiving device 54 is located to the lower left of the check valve 40 to the left of the dashed line E1, the light emitting device 52 and the light receiving device 54 are located on different straight lines, and the angle formed between the light emitting device 52 and the light receiving device 54 is α, where α can be 120 degrees, or other degrees.

As for the soot detection assembly 50 provided at the scroll casing 32, the specific position of the light receiving device 54 can also be provided at the specific position of the check valve 40 with reference to the above-mentioned soot detection assembly 50, and will not be described in detail herein. Referring to fig. 4, in the example of fig. 4, the kitchen utensil 100 further includes a fixing portion disposed at an outer wall of the check valve 40 and spaced apart from each other, and the light emitting device 52 and the light receiving device 54 are mounted at the fixing portion with a space therebetween. Specifically, the fixing portion includes a first fixing portion 521 and a second fixing portion 541 spaced apart, the light emitting device 52 is mounted on the first fixing portion 521, and the light receiving device 54 is mounted on the second fixing portion 541.

In the illustrated embodiment, the fixing portions are integrated with the check valve 40, that is, the first and second fixing

portions

521 and 541 are integrated with the check valve 40. In this way, the manufacture of the fixing portion and the check valve 40 can be made simple.

In another embodiment, the fixing portion and the check valve 40 are separate structures, that is, the first fixing portion 521 and the second fixing portion 541 are separate structures from the check valve 40. Like this, can make oil smoke detection assembly 50 can use on the check valve 40 of different kinds like this, borrow original oil smoke detection assembly 50 and other parts, can reduce check valve 40's transformation cost and raise the efficiency. Specifically, the first and second fixing

portions

521 and 541 may be connected with the check valve 40 by means of screws or a snap or an adhesive.

It should be noted that the first fixing portion 521 and the second fixing portion 541 may be provided as an integral structure or a separate structure according to the actual requirement of the kitchen device 100, and are not limited in detail herein.

In the example of fig. 1 and 4, the kitchen device 100 includes a grommet structure 60 provided on an outer wall of the check valve 40, and the smoke detecting assembly 50 includes wires (not shown) connecting the light emitting device 52 and the light receiving device 54, and a part of the wires are received in the grommet structure 60. Thus, the wire protection structure 60 can protect the wire, and the service life of the oil smoke detection assembly 50 is prolonged.

Specifically, the wire guard structure 60 connects the first fixing portion 521 and the second fixing portion 541, and the wire can be used for power supply and transmission of data, instructions, and the like. The wires include a first wire connected to the light emitting device 52 and a second wire connected to the light receiving device 54. The wire protection structure 60 includes a wire protection cavity 62 and a wire protection cover 61, wherein a part of the first wire and a part of the second wire are accommodated in a wire protection groove formed in the wire protection cavity 62, and the wire protection cover 61 covers the wire protection groove to form a relatively closed space. The two ends of the wire cover 61 can be connected to the first fixing portion 521 and the second fixing portion 541 by means of fastening, screwing, or the like. In addition, a plurality of wires can form a wire bundle, so that the wires are convenient to arrange.

In one embodiment, the first fixing portion 521, the second fixing portion 541 and the wire protection cavity 62 are integrated with the check valve 40.

In another embodiment, the first fixing portion 521, the second fixing portion 541 and the wire protection cavity 62 are separate structures. Specifically, the wire guard structure 60 may be connected to the first fixing portion 521 and the second fixing portion 541 to form an integral part, and the integral part may be connected to the check valve 40 by a screw or a snap or an adhesive.

In the example of fig. 1, 2, 4 and 5, the kitchen device 100 further includes a protection box 70 and a junction box 80, the protection box 70 and the junction box 80 are installed in the case 20, the protection box 70 connects the check valve 40 and the junction box 80, the protection box 70 houses a wire between the wire guard structure 60 and the junction box 80, and the wire is connected to the junction box 80.

Specifically, the protection box 70 and the junction box 80 are installed on the top 22 of the box 20, the material of the junction box 80 may be metal or plastic, and the material of the protection box 70 may be plastic. Referring to fig. 2, the terminal block 80 includes a connection port 82 and a housing 84, and wires are connected into the housing 84 through the connection port 82. The junction box 80 also includes an electrical control board (not shown) disposed within the housing 84. The electric control board comprises a controller (such as an MCU (microprogrammed control unit), a transformer and other electric parts, an electric signal output by the oil smoke detection assembly 50 can be transmitted to the controller through a wire, and the controller can analyze the concentration and distribution characteristics of the oil smoke particles 110 according to the electric signal and control the air volume of the kitchen device 100 according to the concentration and distribution characteristics of the oil smoke particles 110. The transformer is used to supply power to various electric devices including the smoke detection assembly 50.

Generally, according to the requirements of safety regulations, the wires exposed outside need to be able to withstand at least 100N of tensile force tests, so the wires of the smoke detection assembly 50 need to be protected by the wire protection structure 60, the protection box 70, and the like. The packaging scheme for kitchen unit products is generally to separate the check valve assembly 410 (including the check valve 40 and the various parts and components mounted on the check valve 40 including the smoke detection assembly 50) from the cabinet 20 for packaging, and to mount the assembly through after-sales doors, the quick-release structure of the check valve assembly 410 and the wiring box 80 is designed to reduce the after-sales workload.

Specifically, the check valve assembly 410 is fixed to the top 22 of the housing 20, and the wire connecting the light emitting device 52 and the light receiving device 54 can be covered and protected after the wire protecting structure 60 is fastened by a snap or a screw. After the after-market or other personnel connect check valve assembly 410 to junction box 80 via wiring ports 82, the excess length of wire bundle is gathered into protective pocket 70 and check valve assembly 410 is then connected to the top of box 20 (e.g., the top panel of box 20) by screws or the like.

In an embodiment of the present invention, referring to fig. 4 and 5, fig. 5 is a sectional view of the check valve assembly of fig. 4 taken along the line L-L, and the view of the sectional view shown in fig. 5 is a plan sectional view. The light emitting device 52 and the light emitting device 52 each include a sealing plug and a circuit board. Referring to fig. 6 and 7, the sealing plug of the light emitting device 52 is a first sealing plug 562. The sealing plug of the light receiving device 54 is a second sealing plug 564, the circuit board of the light emitting device 52 is a first circuit board 551, and the circuit board of the light receiving device 54 is a second circuit board 552. The first sealing plug 562 is mounted on the first circuit board 551 and the second sealing plug 564 is mounted on the second circuit board 552. The light emitting device 52 further includes an emitting portion 522, and the first sealing plug 562 is formed with a first inner cavity 5622, and the emitting portion 522 is located in the first inner cavity 5622 and disposed on the first circuit board 551. The light receiving device 54 further includes a receiving portion 542, the second sealing plug 564 is formed with a second inner cavity 5642, and the receiving portion 542 is located in the second inner cavity 5642 and disposed on the second circuit board 552.

The first sealing plug 562 forms a first interior cavity 5622 that is open at one end when mated and compressed with the first circuit board 551. The second bore seal 564 forms a second interior cavity 5642 that is open at one end when mated and pressed against the second circuit board 552. The sealing plug can be made of soft materials such as rubber or silica gel. In one example, the ratio of the depth of the cavity to the pore size is greater than or equal to 6, and the diffusion rate of soot particles 110 into the pores can be controlled to be less than 1%.

Referring to fig. 5, 6 and 7, the check valve 40 has a first through hole 401, and the first sealing plug 562 is partially disposed in the first through hole 401, for example, in the first through hole 401 by interference fit. The check valve 40 defines a second through-hole 402 and a second sealing plug 564 is partially disposed in the second through-hole 402, such as by interference fit.

Referring to fig. 6 and 7, the check valve 40 further includes a first protrusion ring 524 protruding on the inner wall of the first through hole 401. The first protruding ring 524 can block the soot particles 110 from entering the first inner cavity 5622, and the first protruding ring 424 is provided with an emission opening 5282 for light to exit. The check valve 40 includes a second male ring 544 protruding from the inner wall of the second through-hole 402. The second collar 544 is formed with a receiving opening 5482 to facilitate light entering. The second raised ring 544 may act to shield the soot particles 110 from entering the second interior cavity 5642.

The emitting portion 522 includes an infrared emitting tube. The receiving unit 542 includes an infrared receiving tube. The emitting portion 522 may emit infrared light, and the receiving portion 542 may receive the infrared light emitted from the emitting portion 522, and output a corresponding electrical signal according to the received infrared light, and the corresponding electrical signal may be transmitted to the controller of the electronic control board through the second circuit board 552.

In the example of fig. 6, a first shielding portion 510 is provided on an inner wall of the first inner cavity 5622 at a front end of the emitting portion 522. Specifically, the first shielding portion 510 is formed with a first slinger 510, and the first slinger 510 is annularly provided convexly on the inner wall of the first inner cavity 5622. The number of the first slinger 506 is plural, and the plural first slingers 506 are arranged along the length direction of the first sealing plug. In the example of fig. 7, a second shielding portion 520 is provided on an inner wall of the second inner cavity 5642 at a front end of the receiving portion 542. Specifically, the second shielding portion 520 is formed with a second oil slinger 508, and the second oil slinger 508 is annularly provided convexly on the inner wall of the second inner cavity 5642. The number of the second oil slinger 508 is plural, and plural second oil slingers 508 are arranged along the length direction of the second sealing plug.

When the soot particles enter the first inner cavity 5622 due to the air fluctuation, the soot particles 110 are shielded by the first shielding portion 510 adsorbed on the first inner cavity 5622 to reduce the pollution to the emission portion 522. With respect to the first oil slinger 508, the grooves of the first oil slinger 506 absorb air fluctuation, and the soot particles 110 are further intercepted by the first oil slinger 506, so that the first oil slinger 506 can further improve the shielding effect on the soot particles 110, and further prevent the soot particles 110 from polluting the emission part 522 and affecting the service life of the emission part 522.

When the soot particles 110 enter the second inner cavity 5642 due to air fluctuation, the soot particles 110 are shielded by the second shielding portion 520 adsorbed on the second inner cavity 5642 to reduce the pollution to the receiving portion 542. With respect to the second oil control ring 508, the grooves of the second oil control ring 508 absorb air fluctuation, and the soot particles 110 are further intercepted by the second oil control ring 508, so that the second oil control ring 508 can further improve the shielding effect on the soot particles 110, and further prevent the soot particles from polluting the receiving portion 542 and affecting the service life of the receiving portion 542.

It should be noted that, in other embodiments, the first blocking portion 510 may include other blocking structures, such as protrusions, ribs, recesses, etc. on the inner wall of the first inner cavity 5622, that is, the first blocking portion 510 is disposed to increase the inner wall area of the first inner cavity 5622, so as to increase the probability of the soot particles being attached. The second shielding portion 520 can include other shielding structures, such as protrusions, ribs, recesses, etc. on the inner wall of the second inner cavity 5642, that is, the second shielding portion 520 can increase the inner wall area of the second inner cavity 5642, thereby increasing the probability of the soot particles being attached.

In the example of fig. 6, 7, and 13, a first oil guide groove 507 is formed in an inner wall of the first inner cavity 5622, and the first oil guide groove 507 is connected to the first shielding portion 510. When the soot particles 110 enter the first inner cavity 5622 due to air fluctuation, the soot particles 110 are adsorbed on the inner wall of the first inner cavity 5622 to form condensate, and the condensate can flow out through the first oil guiding groove 507 at the bottom of the first sealing plug 562. The first oil guiding groove 507 is a long hole with a circular or square cross section, and preferably, the opening of the first oil guiding groove 507 is lower than the inside of the first inner cavity 5622, that is, the first oil guiding groove 507 is inclined downwards in a direction away from the launching part 522, so as to facilitate the liquid to flow out. The first oil guiding groove 507 may also be opened in parallel with the first inner cavity 5622 to allow the liquid to flow out. The side length or diameter of the first oil guiding groove 507 is greater than or equal to 2.5mm (preferably, greater than or equal to 3mm) to overcome the internal tension of the liquid and facilitate the liquid flowing out.

In one example, the first sealing plug 562 is cylindrical, the outer diameter of the first sealing plug 562 is 20-25 mm, the inner diameter of the first sealing plug 562 is 5-10 mm, the depth of the first oil deflector ring 506 is 5-10 mm, the depth of the first oil guide groove 507 is 3-5 mm, the first oil deflector ring 506 is annular, the number of the first oil deflector rings 506 is multiple, the multiple first oil deflector rings 506 are sequentially arranged along the length direction of the first sealing plug 562, and the depth of gaps between every two adjacent first oil deflector rings 506 is the same. It should be noted that the values and value ranges mentioned in the above examples and embodiments are for the purpose of illustrating the implementation of the present invention, and should not be construed as limiting the present invention, and the values and value ranges can be adjusted according to actual design parameters. The numerical values and numerical ranges set forth elsewhere herein are to be understood in light of the teachings herein. In other examples, the first sealing plug 562 may have a regular or irregular nominal shape such as a rectangular parallelepiped, a square cube, etc., and is not limited herein.

In the example of fig. 6 and 7, the first and

second collars

524 and 544 are each opened with a drain hole 529, the drain hole 529 is communicated with the corresponding oil guide groove, and the dirt flowing into the oil guide groove can be discharged from the drain hole 529 to the first and second sealing plugs 562 and 564.

In the example of fig. 7, the inner wall of the second inner cavity 5642 is opened with a second oil guiding groove 509. The second oil guide groove 509 is connected to the second shielding portion 520. When the soot particles 110 enter the second inner cavity 5642 due to air fluctuation, the soot particles 110 are adsorbed on the inner wall of the second inner cavity 5642 to form condensate, and the condensate can flow out through the second oil guiding groove 509 at the bottom of the second sealing plug 564. The second oil guiding groove 509 is an elongated hole with a circular or square cross section, and preferably, the opening of the second oil guiding groove 508 is lower than the inside of the second inner cavity 5642, that is, the second oil guiding groove 509 is inclined downward in a direction away from the receiving portion 542, so as to facilitate the liquid to flow out. The second oil guiding groove 509 is also opened in parallel with the second inner cavity 5642 to allow the liquid to flow out. The length or diameter of the second oil guiding groove 509 is greater than or equal to 2.5mm (preferably, greater than or equal to 3mm) to overcome the internal tension of the liquid and facilitate the liquid flowing out.

In the present embodiment, the central axis of the light emitting device 52 and the central axis of the light receiving device 54 intersect with the central axis of the soot air duct downstream of the fan. The fume duct downstream of the fan includes the fume duct of the check valve 40 and the air outlet duct 320 of the volute. Referring to fig. 8 and 9, in the example of fig. 8 and 9, the central axis of the light emitting device 52 and the central axis of the light receiving device 54 are located on the same straight line T and intersect the central axis Z of the check valve 40. Thus, the installation of the oil smoke detecting assembly 50 is realized. The center axis of the first inner cavity 5622, the center axis of the second inner cavity 5642, and the center axis of the light emitting device 52 and the light receiving device 54 coincide and are all located on the same straight line T.

Specifically, in the example of fig. 3, the air outlet of the check valve 40 is circular, and the central axis Z of the oil smoke duct of the check valve 40 may refer to an axis that is perpendicular to the plane of the oil smoke duct of the check valve 40 and passes through the center of the circle. In other examples, the fume ducts of the check valve 40 may take other regular or irregular shapes, such as square, oval, regular polygon, triangle, and the like. For a square, the central axis Z of the fume duct of the check valve 40 refers to the axis perpendicular to the plane of the fume duct of the check valve 40 and passing through the intersection of the diagonals of the square. For an oval shape, the central axis Z of the oil smoke duct of the check valve 40 may refer to an axis perpendicular to the plane of the oil smoke duct of the check valve 40 and passing through any one of the focal points of the oval shape. For regular polygon, the central axis Z of the oil smoke duct of the check valve 40 may refer to an axis perpendicular to the plane of the oil smoke duct of the check valve 40 and passing through the center of the circumscribed circle or the inscribed circle of the regular polygon. In other irregular shapes, the central axis Z of the oil smoke duct of the check valve 40 may refer to an axis that is perpendicular to the plane of the oil smoke duct of the check valve 40 and passes through the irregular shape to circumscribe the center of the largest circle or inscribe the center of the smallest circle. The central axis of the outlet channel 320 of the volute in the present invention is also similarly understood as described above.

Further, one end of the first sealing plug 562 is opened with a transmitting opening 5282, the second sealing plug 564 is opened with a receiving opening 5482, and the diameter of the receiving opening 5482 is larger than that of the transmitting opening 5282. Thus, the light receiving area of the light receiving device 54 can be increased.

In the example of fig. 8, the first sealing plug 562 includes a first end surface 5621 and a second end surface 5623, the launch portion 522 is adjacent the second end surface 5623, the second sealing plug 564 includes a third end surface 5641 and a fourth end surface 5643, the receiving portion 542 is adjacent the fourth end surface 5643, and a diameter of the launch opening 5282 and a diameter of the receiving opening 5482 satisfy the relationship: d2 ≧ (d1 × (L1+ L))/(1.414 × L1), where d1 is the diameter of the launch opening 5282, d2 is the diameter of the receive opening 5482, L1 is the distance from the launch portion 522 to the first end face 5621, and L is the distance from the first end 5621 face to the third end face 5641. In this manner, the light receiving device 54 can be made to better receive the light emitted from the light emitting portion 522.

Specifically, referring to fig. 8, the angle of the light emitted from the light emitting portion 522 is restricted by the dimension d1 of the emitting opening 5282 of the first sealing plug 562, and the spot diameter of the light emitted from the light emitting portion 522 reaches the light receiving portion 542 is enlarged to d. In order to ensure that the intensity of light received by the light receiving section 542 is sufficient, it is sufficient that the aperture area of the receiving opening 5482 is equal to or larger than half the spot area, i.e., pi (d2)²≥0.5×πd²In this example, knowing L, L1, d1, one can deduce: d-d 1 × (L + L1)/L1, which is to say, d2 ≧ d1 × (L1+ L))/(1.414 × L1) is satisfied in the present example according to the illustrated ray propagation manner. The conditions of the present embodiment can be applied to the design when no lens is provided inside the light emitting device 52 and the light receiving device 54.

In the example of fig. 8 and 9, the central axis of the light emitting device 52 and the central axis of the light receiving device 54 are located on the same straight line T on the plane perpendicular to the check valve central axis Z, and the light emitting device 52 and the light receiving device 54 are respectively disposed on the left and right sides of the check valve 40. The central axis Z of the check valve 40 of fig. 11 is perpendicular to the paper.

In another embodiment, the central axis of the light emitting device 52 and the central axis of the light receiving device 54 are located on the same straight line that is obliquely disposed with respect to a plane perpendicular to the central axis Z of the check valve 40. For example, the central axis of the light emitting device 52 and the central axis of the light receiving device 54 are located on the same straight line inclined by 10 degrees, 20 degrees, or 30 degrees with respect to the plane perpendicular to the central axis Z of the check valve 40, and the inclined angle is not limited herein.

The light receiving device 54 and the light emitting device 52 shown in fig. 9 are disposed on the left and right sides of the check valve 40, respectively, and may be horizontally rotated by any angle in the illustrated installation position, such as disposed on the front and rear sides of the check valve 40 or in other orientations. The light emitting device 52 can emit light (e.g., infrared light), which passes through the soot air channel region of the check valve 40 and is received by the opposite light receiving device 54, and when there is no particulate matter in the air channel region, the detected light intensity of the light receiving device 54 is substantially unchanged, i.e., the value (e.g., voltage value) of the output electrical signal is substantially unchanged.

The soot particles pass through the volute 32 to the soot duct of the check valve 40 by centrifugal force of the impeller. The soot particles 110 pass through the light path to cause light shielding, scattering and diffraction, wherein the light shielding of particles with large particle size has a large influence on the intensity of light, causing the intensity of light received by the light receiving device 54 to be reduced. When the amount of soot decreases, the shielding effect is reduced, and the intensity of light received by the light receiving device 54 increases. The light intensity can be represented by the value of the electrical signal, for example, the light receiving device 54 receives the light and outputs the electrical signal, the electrical signal is analog-to-digital converted to obtain a digital signal, and the digital signal can be used to obtain a corresponding value, such as a voltage value.

In one embodiment, referring to fig. 10, during the static stage of cooking, when no soot particles 110 are generated, the intensity of light received by the light receiving device 54 remains substantially unchanged. In the heating stage of cooking, soot particles 110 start to be generated, and the intensity of light received by the light receiving device 54 gradually decreases. During the cooking stage, the concentration of soot particles 110 increases rapidly and the intensity of light received by the light receiving device 54 decreases rapidly. During the stir-fry stage of cooking, the concentration of the soot particles 110 fluctuates and is high, and the intensity of light received by the light receiving device 54 also fluctuates and is low. During the off-fire phase of cooking, the concentration of soot particles 110 rapidly decreases and the intensity of light received by light receiving device 54 rapidly increases.

Referring to fig. 11, in the embodiment of fig. 11, the central axis T1 of the light emitting device 52 and the central axis T2 of the light receiving device 54 intersect the central axis of the check valve 40, and the included angle α formed by the intersection of the central axis of the light emitting device 52 and the central axis of the light receiving device 54 is in the range of (0 °,180 °).

Specifically, in one embodiment, referring to FIG. 11, the plane formed by the central axis of the light emitting device 52 and the central axis of the light receiving device 54 is parallel to or coincident with a plane perpendicular to the central axis Z of the check valve 40. The central axis of the light emitting device 52 and the central axis of the light receiving device 54 intersect to form an angle α of less than 180 degrees.

In other embodiments, the plane formed by the central axis of the light emitting device 52 and the central axis of the light receiving device 54 may also be inclined with respect to a plane perpendicular to the central axis Z of the check valve 40. The inclined angle can be set according to actual requirements, and is not limited herein. The central axis of the light emitting device 52 and the central axis of the light receiving device 54 intersect to form an angle of less than 180 degrees.

In the example of fig. 11, the light emitting devices 52 and the light receiving devices 54 are staggered to form an included angle α, and light emitted from the light emitting devices 52 may pass through the inner region of the check valve 40 and be scattered by the soot particles 110 such that the light may be received by the light receiving devices. According to the meter scattering theory, in the case where the light emitting devices 52 and the light receiving devices 54 are alternately arranged to form the preset included angle α, when there are no soot particles 110 in the inner region of the check valve 40, almost no infrared light is received by the light receiving devices 54, and the intensity of light received by the light receiving devices 54 is weak. When soot particles 110 are present in the inner area of the check valve 40, infrared light emitted from the light emitting device 52 is scattered by the soot particles 110, and a part of the infrared light is received by the light receiving device 54, so that the intensity of the light received by the light receiving device 54 is stronger.

Referring to fig. 12, in the example of fig. 12, during the static stage of cooking, when no soot particles 110 are generated, the light intensity received by the light receiving device 54 is weak and remains substantially unchanged. During the heating phase of cooking, soot particles 110 begin to be generated and the intensity of light received by the light receiving device 54 gradually increases. During the cooking stage, the concentration of soot particles 110 increases rapidly, and the intensity of light received by the light receiving device 54 increases rapidly. During the stir-fry stage of cooking, the concentration of the soot particles 110 fluctuates and is high, and the intensity of light received by the light receiving device 54 also fluctuates and is high. During the off-fire phase of cooking, the concentration of soot particles 110 rapidly decreases and the intensity of light received by light receiving device 54 rapidly decreases.

In fig. 9 and 11, the light emitting device 52 includes a first lens 57, the first lens 57 is disposed in the first inner cavity 5622 and located on the light outgoing path of the emitting portion 522, and the first lens 57 is used for emitting the light rays emitted from the emitting portion 522 in parallel. In this way, substantially all of the light emitted from the emitting portion 522 can be guided into the smoke passage of the check valve 40, and the sensitivity of the smoke detection unit 50 is further improved.

Specifically, the emitting portion 522 of the light emitting device 52 is located at the focal position of the first lens 57, so as to converge the light rays into a parallel light column to be emitted.

The light receiving device 54 includes a second lens 58, the second lens 58 is disposed in the second inner cavity 5642 and located on a receiving light path of the receiving portion 542, and the second lens 58 is configured to converge the light entering from the second inner cavity 5642 to the receiving portion 542. In this way, light entering the second inner cavity 5642 can be substantially converged to the receiving portion 542, and the sensitivity of the lampblack detection assembly 50 is further improved.

Specifically, the sensor chip sensing window of the receiving portion 542 of the light receiving device 54 is located at the focal position of the second lens 58, so as to collect and receive the light rays of the second inner cavity 5642. The first lens 57 and the second lens 58 are both convex lenses, or a lens group equivalent to a convex lens.

Further, a first paraboloid 5672 is formed at one end of the first inner cavity 5622, and the emitting portion 522 is located at a focal point of the first paraboloid 5672, so as to converge the light rays emitted from the emitting portion 522 into a parallel light column to be emitted. Specifically, in the illustrated embodiment, a first light guide hole 5652 is formed at a focal point of the first paraboloid 5672, and the emitting portion penetrates through the first light guide hole 5652. It is understood that in other embodiments, the emitting portion 522 may be positioned directly at the focal point of the first paraboloid 5672. The embodiment in which the first cavity 5622 is provided with the first paraboloid 5672 is applicable to the embodiment in which the first lens 57 is provided in the first cavity 5622 and the embodiment in which the first lens 57 is not provided.

Further, a second paraboloid 5674 is formed at one end of the second cavity 5642, and the receiving portion is located at a focal point of the second paraboloid 5674. In this way, the light in the second inner cavity 5642 is converged to the receiving part for receiving. Specifically, in the illustrated embodiment, the second light guide hole 5654 is formed at the focal point of the second paraboloid 5674, and the receiving portion 542 is formed through the second light guide hole 5654. It is understood that in other embodiments, the receiving portion 542 may be directly placed at the focal point of the second paraboloid 5674. The embodiment in which the second cavity 5642 is provided with the second paraboloid 5674 is applicable to the embodiment in which the second lens 58 is provided in the second cavity 5642 and the embodiment in which the second lens 58 is not provided.

In the example of fig. 13, the first sealing plug 562 also includes a locating pin 561. The sealing plug 56 can be accurately mounted on the first fixing portion 521 by the positioning action of the positioning pin 561. The planar shape of the positioning pin 561 is rectangular, circular, triangular, etc., and is not limited herein. In the example of fig. 13, the planar shape of the positioning pin 561 is rectangular. The second sealing plug 564 is of similar construction to the first sealing plug 562.

In summary, the kitchen apparatus 100 according to the embodiment of the present invention includes a box 20 and a smoke detecting assembly 50, a fan assembly 30 is disposed in the box 20, the fan assembly 30 includes a volute 32 and a fan 34 disposed in the volute 32, the kitchen apparatus 100 includes a smoke duct located downstream of the fan 34, and the smoke detecting assembly 50 is disposed downstream of the fan 34. The lampblack detection assembly 50 comprises a light emitting device 52 and a light receiving device 54, the light emitting device 52 is used for emitting light rays to the lampblack air channel, the light receiving device 54 is used for receiving the light rays emitted by the light emitting device 52 and outputting an electric signal according to the received light rays, a central axis E of the air outlet 321 of the volute 32 is located between the light receiving device 54 and a rotating axis F of an impeller of the fan 34, or the central axis E of the air outlet 321 of the volute 32 is located between the light emitting device 52 and the rotating axis F of the impeller of the fan 34.

In the kitchen apparatus 100 of the above embodiment, the central axis E of the air outlet 321 of the volute 32 is located between the light receiving device 54 and the central axis F of the impeller of the fan 34, or the central axis E of the air outlet 321 of the volute 32 is located between the light emitting device 52 and the rotation axis F of the impeller of the fan 34, when the concentration of the soot particles 110 in the soot air duct changes slightly, a significant change in the intensity of light received by the light receiving device 54 may be caused, i.e., the sensitivity of the soot detection assembly 50 is improved.

It should be noted that, in the drawings of the present invention, a straight line with an arrow indicates a light ray and a propagation direction thereof, which are schematic representations and should not be construed as limiting the present invention.

In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" 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.

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, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

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, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.

Claims

1. A kitchen device comprises a box body and an oil smoke detection component, wherein a fan component is arranged in the box body, the fan component comprises a volute and a fan arranged in the volute, the oil smoke detection component comprises a light emitting device and a light receiving device, it is characterized in that the kitchen device comprises an oil smoke air duct positioned at the downstream of the fan, the oil smoke detection component is arranged at the oil smoke air duct at the downstream of the fan, the light emitting device is used for emitting light to the lampblack air channel, the light receiving device is used for receiving the light emitted by the light emitting device and outputting an electric signal according to the received light, the central axis of the air outlet of the volute is positioned between the light receiving device and the rotation axis of the impeller of the fan, or the central axis of the air outlet of the volute is positioned between the light emitting device and the rotation axis of the impeller of the fan.

2. The kitchen device of claim 1, wherein a central axis of the light emitting device and a central axis of the light receiving device intersect a central axis of the cooking fume duct, and the central axes of the light emitting device and the light receiving device are located on the same line or different lines.

3. A kitchen device according to claim 2, characterized in that the plane formed by the central axis of the light-emitting means and the central axis of the light-receiving means is parallel or inclined with respect to a plane perpendicular to the central axis of the cooking fume duct.

4. The kitchen device of claim 1, wherein the light emitting device includes a first sealing plug mounted on the first circuit board, a transmitting portion formed with a first interior cavity, and a first circuit board on which the transmitting portion is located; and/or

The light receiving device comprises a second sealing plug, a receiving part and a second circuit board, wherein the second sealing plug is installed on the second circuit board, a second inner cavity is formed in the second sealing plug, and the receiving part is located in the second inner cavity and arranged on the second circuit board.

5. The kitchen utensil of claim 4 wherein one end of the first interior cavity is formed with a first paraboloid, the emitting portion being located at a focal point of the first paraboloid; and/or

A second paraboloid is formed at one end of the second inner cavity, and the receiving part is located at the focal point of the second paraboloid.

6. The kitchen device as claimed in claim 4, wherein the light emitting device comprises a first lens disposed in the first inner cavity and located on a light emitting path of the emitting portion, the first lens being configured to emit the light emitted from the emitting portion in parallel; and/or

The light receiving device comprises a second lens, the second lens is arranged in the second inner cavity and positioned on the receiving light path of the receiving part, and the second lens is used for converging light entering from the second inner cavity to the receiving part.

7. The kitchen device according to claim 4, wherein the inner wall of the first inner cavity is provided with a first shielding part positioned at the front end of the transmitting part; and/or

And a second shielding part positioned at the front end of the receiving part is arranged on the inner wall of the second inner cavity.

8. The kitchen device according to claim 7, wherein the inner wall of the first inner cavity is provided with a first oil guide groove connected with the first shielding part; and/or

And a second oil guide groove connected with the second shielding part is formed in the inner wall of the second inner cavity.

9. A kitchen device according to claim 1, characterized in that the light emitting means comprise a first sealing plug, one end of which is provided with a transmitting opening, and the light receiving means comprise a second sealing plug, one end of which is provided with a receiving opening, the diameter of which is larger than the diameter of the transmitting opening.

10. The kitchen device of claim 1, comprising a first fixing portion to fix the light emitting device and a second fixing portion to fix the light receiving device.