CN210688382U - Kitchen appliance - Google Patents

Abstract

The utility model discloses a kitchen appliance. Kitchen appliance includes box and oil smoke determine module, is equipped with the fan subassembly in the box, and the fan subassembly includes the spiral case and establishes the fan in the spiral case, and oil smoke determine module establishes at the wind channel end, and oil smoke determine module includes light emitting device and light receiving arrangement, and light emitting device is used for to the terminal oil smoke wind channel emission light in wind channel, and light receiving arrangement is used for receiving the light of light emitting device transmission. The kitchen appliance of the embodiment has the advantages that the light emitting device and the light receiving device are arranged at the tail end of the air channel, and the oil smoke particles in the oil smoke air channel at the tail end of the air channel can influence the intensity of light emitted by the light receiving device to receive the light emitted by the light emitting device during cooking, so that the fan can be controlled by data output by the light receiving device, the operation of a user is not needed, and the convenience is improved.

Description

Kitchen appliance

Technical Field

The utility model relates to a kitchen appliance technical field, more specifically say, relate to a kitchen appliance.

Background

In the related art, the oil smoke concentration of a user is changed at any time during cooking, the range hood cannot automatically shift according to the oil smoke concentration, and the user needs to manually adjust the gear of the fan. If the user sets the gear of the fan of the range hood to be higher manually, the fan is easy to generate larger noise although better smoke exhaust effect can be ensured. If the user sets the gear of the fan of the range hood to be low manually, oil smoke cannot be discharged rapidly, and adverse effects on the health of the user can be caused. And because the panel of lampblack absorber receives the pollution of oil smoke granule easily, can influence the health during manual operation fan gear to can break user's culinary art process, user experience nature is poor.

SUMMERY OF THE UTILITY MODEL

The utility model discloses embodiment provides a kitchen appliance.

The utility model discloses embodiment's kitchen appliance includes box and oil smoke determine module, be equipped with the fan subassembly in the box, the fan subassembly includes the spiral case and establishes fan in the spiral case, oil smoke determine module establishes at the wind channel end, oil smoke determine module includes light emitting device and light receiving device, light emitting device be used for to terminal oil smoke wind channel emission light in wind channel, light receiving device is used for receiving the light of light emitting device transmission.

The kitchen appliance of the embodiment has the advantages that the light emitting device and the light receiving device are arranged at the tail end of the air channel, and the oil smoke particles in the oil smoke air channel at the tail end of the air channel can influence the intensity of light emitted by the light receiving device to receive the light emitted by the light emitting device during cooking, so that the fan can be controlled by data output by the light receiving device, the operation of a user is not needed, and the convenience is improved.

In some embodiments, the duct end includes a check valve and a volute end, and the smoke detection assembly is disposed at least one of the check valve and the volute end. Therefore, the accuracy of detecting the concentration of the oil smoke particles can be improved.

In some embodiments, the kitchen appliance comprises a flow guide plate assembly, the box body is arranged on the flow guide plate assembly, and the kitchen appliance is used for controlling the operation of the fan assembly and the flow guide plate assembly and/or reminding of oil quantity information of the kitchen appliance according to an electric signal output by the light receiving device. So, make the fan subassembly can provide suitable amount of wind like this in order to absorb the oil smoke granule, the user can in time learn the content of oil smoke granule.

In some embodiments, in the case that the soot detection assembly is disposed at the end of the volute and the check valve, the axis of the light emitting device and the axis of the light receiving device disposed at the end of the volute are located on the same line and intersect with the central axis of the air outlet at the end of the volute, and the axis of the light emitting device and the axis of the light receiving device disposed at the check valve are located on the same line and intersect with the central axis of the air outlet of the check valve; under the condition that the oil smoke detection assembly is arranged at the tail end of the volute, the axis of the light emitting device and the axis of the light receiving device are positioned on the same straight line and are intersected with the central axis of the air outlet at the tail end of the volute; under the condition that the oil smoke detection assembly is arranged on the check valve, the axis of the light emitting device and the axis of the light receiving device are located on the same straight line and are intersected with the central axis of the air outlet of the check valve. 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 smoke detection assembly comprises a plurality of detection pairs, each detection pair comprising one of the light emitting devices and one of the light receiving devices, with the smoke detection assembly disposed at the end of the volute and the check valve, at least two of the detection pairs being disposed at the end of the volute, at least two of the detection pairs being disposed at the check valve; under the condition that the oil smoke detection assembly is arranged at the tail end of the volute, at least two detection pairs are arranged at the tail end of the volute; under the condition that the oil smoke detection assembly is arranged on the check valve, at least two detection pairs are arranged on the check valve. So, can follow the concentration of the oil smoke granule on the oil smoke wind channel that a plurality of angles detected kitchen appliance respectively, avoided under the extremely inhomogeneous condition of kitchen appliance's oil smoke wind channel distribution, light receiving device probably can not detect the condition of the existence of oil smoke granule, the kitchen appliance's of this embodiment oil smoke granule detects the accuracy of concentration high, and the erroneous judgement rate is low.

In some embodiments, the axis of the light emitting device and the axis of the light receiving device of each of the detection pairs are located on the same line and intersect the central axis of at least one of the outlet opening of the volute end and the outlet opening of the check valve. Therefore, the sensitivity of the oil smoke detection assembly can be improved.

In some embodiments, the axis of the light emitting device and the axis of the light receiving device are located on different straight lines, and the intersection angle formed by the intersection of the axis of the light emitting device and the axis of the light receiving device ranges from (0 °,180 °). 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 kitchen appliance includes a drive device coupled to the smoke detection assembly for driving at least one of the light emitting device and the light receiving device to move relative to the check valve, or relative to the volute end and the check valve. In this way, a movement scheme of the light-emitting means and/or the light-receiving means is achieved, which can subsequently be used for the detection scheme of the concentration of soot particles and the size and distribution of soot particles.

In some embodiments, the number of the light emitting devices is multiple, the number of the light receiving devices is single, the axis of each light emitting device intersects with the axis of the light receiving device at the central axis of the air outlet at the end of the volute and/or the central axis of the air outlet of the check valve, and the included angles formed by the intersection of the axis of each light emitting device and the axis of the light receiving device are different, or are the same, or are partially different, and the included angles range from (0 ° to 180 °). So, make like this under the inhomogeneous condition of oil smoke particulate matter distribution in spiral case end or check valve, the kitchen appliance of this embodiment can accurately detect the concentration of oil smoke granule and the size and the distribution of oil smoke granule, and then can provide the amount of wind of suitable fan in order to absorb the oil smoke granule.

In some embodiments, the kitchen appliance includes a reflector disposed at the end of the volute and at least one inner wall of the check valve, the reflector being configured to reflect light emitted by the light emitting device to at least one of the soot duct at the end of the volute, the soot duct of the check valve, and the light receiving device. Therefore, the probability of meeting of light rays and oil smoke particles can be greatly increased, and the sensitivity of the oil smoke detection assembly is obviously increased.

In some embodiments, the light emitting device includes a first sealing plug mounted on the first circuit board, the first sealing plug forming a first inner cavity, an emitting portion located in the first inner cavity and disposed on the first circuit board, at least one of the check valve and the end of the scroll casing is opened with a first through hole, and a first circuit board, the first sealing plug being partially disposed in the first through hole. So, the emission portion is located first inner chamber, can reduce the adverse effect of oil smoke granule to the emission portion, has prolonged the life of emission portion.

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 the light emitted by the emitting portion in parallel. Thus, the efficiency of the emitting part emitting light can be improved.

In some embodiments, the light receiving device includes a second sealing plug, a receiving portion, and a second circuit board, the second sealing plug is mounted on the second circuit board, the second sealing plug forms a second inner cavity, the receiving portion is located in the second inner cavity and disposed on the second circuit board, at least one of the check valve and the end of the scroll casing is opened with a second through hole, and the second sealing plug is partially disposed in the second through hole. Therefore, the receiving part is positioned in the second inner cavity, the adverse effect of the oil smoke particles on the receiving part can be reduced, and the service life of the receiving part is prolonged.

In some embodiments, the light receiving device includes a second lens disposed in the second cavity and located on the receiving light path of the receiving portion, and the second lens is configured to converge the light entering from the second cavity to the receiving portion. Thus, the efficiency of receiving light by the receiving portion can be improved.

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 light emitting device includes an emitting portion and a first sealing plug, a first inner cavity is disposed in the first sealing plug, the emitting portion is at least partially located in the first inner cavity, a first oil guide groove is formed in an inner wall of the first inner cavity, the light receiving device includes a receiving portion and a second sealing plug, a second inner cavity is disposed in the second sealing plug, the receiving portion is at least partially located in the second inner cavity, a second oil guide groove is formed in an inner wall of the second inner cavity, and an opening direction of the first oil guide groove is staggered from an opening direction of the second oil guide groove. So, first oil groove and the second of leading leads the design of just not right of oil groove, avoids stray light's interference.

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 structural diagram of a kitchen appliance according to an embodiment of the present invention.

Fig. 2 is another schematic structural diagram of the kitchen appliance according to the embodiment of the present invention.

Fig. 3 is another schematic structural diagram of the kitchen appliance according to the embodiment of the present invention.

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

Fig. 5 is a plan 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 perspective cross-sectional view of the check valve assembly of fig. 4 in the L-L direction.

Fig. 9 is an enlarged view of the portion III of fig. 8.

Fig. 10 is an enlarged view of the portion IV of fig. 8.

Fig. 11 is a schematic structural diagram of an oil smoke detection assembly according to an embodiment of the present invention.

Fig. 12 is another schematic structural diagram of the lampblack detection assembly according to the embodiment of the present invention.

Fig. 13 is a graph showing the relationship between the intensity of light received by the light receiving device of the kitchen appliance and time according to the embodiment of the present invention.

Fig. 14 is another schematic structural diagram of the lampblack detection assembly according to the embodiment of the present invention.

Fig. 15 is a schematic view of another structure of the lampblack detection assembly according to the embodiment of the present invention.

Fig. 16 is another graph showing the relationship between the intensity of light received by the light receiving device of the kitchen appliance and time according to the embodiment of the present invention.

Fig. 17 is a schematic view of another structure of the lampblack detection assembly according to the embodiment of the present invention.

Fig. 18 is a graph showing a relationship between a driving current and time of the kitchen appliance according to the embodiment of the present invention.

Fig. 19 is a schematic view of another structure of the lampblack detection assembly according to the embodiment of the present invention.

Fig. 20 is a schematic view of another structure of the lampblack detection assembly according to the embodiment of the present invention.

Fig. 21 is a schematic view of the sealing plug according to the embodiment of the present invention.

Description of the main element symbols:

the kitchen appliance 100, the baffle assembly 10, the touch button 12, the box 20, the top 22, the fan assembly 30, the air duct end 210, the volute 32, the volute end 324, 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 detection pair 51, the light emitting device 52, the first fixing portion 521, the emitting portion 522, the first convex ring 524, the emitting opening 5282, the drain 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 inner cavity 562, the first inner cavity 5622, the first end face 5621, the second end face 5623, the second inner cavity 564, the second end face 5642, the fourth end face 43, the first shielding portion 510, the first oil retaining ring 506, the second shielding portion 520, the second oil retaining ring 508, the first oil guiding groove 507, the second oil guiding groove 509, the first light guiding hole 5652, The light source module comprises a second light guide hole 5654, 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, a housing 84, a driving device 90, a transmission assembly 92, a transmission gear 922, a transmission rack 924, a reflector 120, a first part 122 and a second part 124.

Detailed Description

The following describes embodiments of the present invention with reference to the accompanying 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 and are only used for explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. 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 structural diagram of a kitchen appliance 100 according to an embodiment of the present invention, in the example of fig. 1, the kitchen appliance 100 is an upward-discharging kitchen appliance 100. It is understood that in other embodiments, the kitchen appliance 100 may be a bottom-up kitchen appliance 100, a side-up kitchen appliance 100, or the like, and is not limited thereto. The kitchen appliance 100 is described in detail below as an example of the kitchen appliance 100 of the top-up type. Specifically, the kitchen appliance 100 includes, but is not limited to, a range hood, an integrated range, and the like having a smoke exhaust function. In the illustrated embodiment, the kitchen appliance 100 is described by taking a range hood as an example. The range hood can be a variable frequency range hood.

Referring to fig. 1 to 3, the kitchen appliance 100 according to the embodiment of the present invention includes a baffle assembly 10, a box 20 and a check valve assembly 410, 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, after the touch key 12 is triggered, the kitchen appliance 100 is opened, and the oil smoke 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 soot wind path 322 at the end 324 of the volute. The check valve 40 is connected to the top 22 of the housing 20 and to the outlet of the smoke stack 322 at the end 324 of the volute. The soot particles 110 may be discharged from the outlet of the soot chimney 322 at the end 324 of the volute and then through the check valve 40 into the smoke tube or flue.

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 this embodiment, the soot particles 110 are discharged from the soot wind tunnel 322 at the end 324 of the volute 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 rotation 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 utility model discloses kitchen appliance 100 of embodiment includes oil smoke detection component 50, and oil smoke detection component 50 establishes at wind channel end 210. The smoke detection assembly 50 includes a light emitting device 52 and a light receiving device 54. The light emitting device 52 is used for emitting light to the lampblack air channel at the end 210 of the air channel. The light receiving device 54 is used for receiving the light emitted by the light emitting device 52 and outputting an electrical signal according to the received light. In one embodiment, the kitchen appliance 100 is used for controlling and prompting information according to the electric signal. In another embodiment, the kitchen appliance 100 is adapted to be controlled based on an electrical signal. In yet another embodiment, the kitchen appliance 110 is configured to prompt for information based on an electrical signal.

In the present embodiment, the kitchen appliance 110 can control the operation of the fan assembly 30 and the deflector assembly 10 according to the electrical signal, for example, the air volume of the fan 34 can be controlled, or the deflector assembly 10 can be controlled to operate to suck the soot particles 110, or a reminder device disposed on the deflector assembly 10 can give a reminder of the oil volume information of the kitchen appliance or display the oil volume parameter on the display panel of the deflector assembly 10.

Specifically, the tunnel end 210 includes the check valve 40 and the volute end 324. The smoke detection assembly 50 may be disposed at least one of the volute end 324 and the check valve 40. In the embodiment of fig. 1 and 2, the smoke detection assembly 50 may be disposed at the check valve 40, such as an outer wall of the check valve 40. In another embodiment, the smoke detection assembly 50 may be disposed on an inner wall of the check valve 40, and in the embodiment of fig. 3, the smoke detection assembly 50 is disposed at the volute end 324 and the check valve 40. It is understood that in other embodiments, the smoke detection assembly 50 can be disposed at the volute end 324. The volute end 324 refers to a position of the oil smoke duct 322 of the volute 32 near the air outlet of the volute 32, and the oil smoke duct 322 of the volute end 324 may refer to a duct downstream of the air flow discharged from the fan 34. In other embodiments, the oil smoke detection assembly 50 may be disposed on the check valve 40, and in the embodiments of the present invention, the oil smoke detection assembly 50 is disposed on the outer wall of the check valve 40 as an example.

In the case that the smoke detecting assembly 50 is disposed at the end 324 of the volute and the check valve 40, the smoke detecting assembly 50 is used for detecting the concentration of the smoke particles 110 in the smoke duct 322 at the end 324 of the volute and the concentration of the smoke particles 110 in the check valve 40. The detected concentrations of the two soot particles 110 may be an average of the two concentrations and used as the concentration of the soot particle 110 controlling the air volume of the fan 34, or the concentrations of the two soot particles 110 may be assigned different weights or proportions to calculate the concentration of the soot particle 110 controlling the air volume of the fan 34.

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.

The smoke detection assembly 50 includes a light emitting device 52 and a light receiving device 54. The light emitting device 52 is used for emitting light to the cooking fume duct 41 of 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 electrical 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 check valve 40 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 appliance 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. In addition, the light receiving device 54 is disposed at an orientation on a side of the volute outlet biased, for example, the left side as viewed in fig. 3. Specifically, 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 oil smoke concentration and the air volume of the fan can be established by simulating the actual use scene of the kitchen appliance 100, and the oil 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 above embodiment, since the concentration of the soot particles 110 in the soot air duct 322 at the end 324 of the scroll casing or the soot air duct 41 of the check valve 40 is lower than the concentration of the soot particles at the air inlet of the kitchen appliance or the air inlet of the scroll casing, compared to the arrangement of the soot detection assembly at the air inlet of the kitchen appliance or the air inlet of the scroll casing, in the present embodiment, the soot detection assembly 50 is arranged at least one of the end 324 of the scroll casing and the check valve 40, so that the soot detection assembly 50 is less polluted. Because the soot particles 110 are subjected to centrifugal force by the impeller of the scroll casing 32 at the front end, soot separation is performed, which causes a portion of the soot particles 110 to flow back into the oil cup of the kitchen appliance 100, so that less contaminants (soot particles) enter the soot detection assembly 50 disposed at the end 324 of the scroll casing or less contaminants (soot particles) enter the soot detection assembly 50 disposed at the check valve 40. The oil smoke detection assembly 50 is less polluted, so that the service life of the oil smoke detection assembly 50 can be prolonged, and the reliability of the oil smoke detection assembly 50 is high.

Additionally, as the user cooks, the temperature at the scroll end 324 or the check valve 40 area is significantly lower than the temperature at the air inlet of the kitchen appliance 100 or the air inlet of the scroll. Therefore, in the present embodiment, the smoke detecting assembly 50 is disposed at least one of the volute end 324 and the check valve 40, so that the smoke detecting assembly 50 is less affected by the cooking temperature (especially, in the infrared temperature measuring scheme adopted for the smoke detecting assembly, the infrared emitting part and the infrared receiving part are used, and the characteristics of the infrared emitting part and the infrared receiving part are greatly affected by the temperature, and the service life of the device is affected in a high temperature environment), and further, the service life of the smoke detecting assembly 50 can be prolonged, and the reliability of the smoke detecting assembly 50 is high.

Further, in the present embodiment, the oil smoke detection assembly 50 is mounted on the check valve 40, and is independent from the kitchen appliance 100, and the oil smoke detection assembly 50 is not affected by the kitchen appliance 100, so that the assembly and disassembly are independent and convenient, and the universality is strong, and the present invention is suitable for all types of kitchen appliances, such as side-draft kitchen appliances, T-type kitchen appliances, tower-type kitchen appliances, and chinese-style kitchen appliances.

Referring to fig. 4, in the example of fig. 4, the kitchen appliance 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 actual requirements of the kitchen appliance 100, and are not limited in detail herein.

In the example of fig. 1 and 4, the kitchen appliance 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 appliance 100 further includes a protection box 70 and a junction box 80, the protection box 70 and the junction box 80 are mounted on the cabinet 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 protection 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 appliance 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 of the kitchen electrical appliance product is that a check valve component (comprising a check valve 40 and various parts and components which are arranged on the check valve 40 and comprise a lampblack detection component 50) is separated from a box body 20 for packaging, and is installed by an after-sale door, and in order to reduce the after-sale workload, a quick-release structure of the check valve component and a wire box 80 is required to be designed.

Specifically, the check valve assembly is fixed on the top of the housing 20, and the wire connecting the light emitting device 52 and the light receiving device 54 can be covered for protection after the wire protecting structure 60 is fixed by a snap or a screw. After the check valve assembly and junction box 80 are connected by a quick-connect plug by an after-market person or other person, the excess length of wire bundle is gathered into protective case 70 and then the check valve assembly is connected to the top of box 20 (e.g., the top plate of box 20) by screws or the like.

In an embodiment of the present invention, please refer to fig. 4 and 5, fig. 5 is a sectional view of the check valve assembly of fig. 4 along the L-L line, and the viewing angle of the sectional view shown in fig. 5 is a plane sectional view. The light emitting means 52 and the light emitting means 52 each comprise a sealing plug, which in the illustrated embodiment is cylindrical, and a circuit board. In other embodiments, the sealing plug may be in the shape of a square column or other column, and is not particularly limited herein. 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 is provided with a first through hole 401, and the first sealing plug 562 is partially disposed in the first through hole 401. The check valve 40 defines a second through-hole 402 and a second sealing plug 564 is partially disposed within the second through-hole 402.

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.

In the case where the smoke detecting unit 50 is provided at the scroll end 324, the first through hole 401 and the second through hole 402 of the above-described embodiment may be provided at the scroll end 324.

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 562. 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 the plural second oil slingers 508 are arranged along the length direction of the second sealing plug 564.

When the soot particles 110 enter the first inner cavity 5622 due to 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 21, 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 has an outer diameter of 20 to 25mm, an inner diameter of 5 to 10mm, a depth of the first slinger 506 of 5 to 10mm, a depth of the first oil guiding groove 507 of 3 to 5mm, the first slinger 506 is annular, the number of the first slingers 506 is plural, the plural first slingers 506 are sequentially arranged along a length direction of the first sealing plug 562, and the depths of the first slingers 506 are the same. It should be noted that the values and the value ranges mentioned in the above examples and embodiments are for the purpose of illustrating the practice of the present invention, and should not be construed as limiting the present invention, and the values and the value ranges can be adjusted according to the actual design parameters. The numerical values and numerical ranges set forth elsewhere herein are to be understood in light of the teachings 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.

Referring to fig. 4 and 8, fig. 8 is a perspective sectional view of the check valve assembly of fig. 4 taken along line L-L. In the example of fig. 9 and 10, a first oil guide groove 507 is formed in an inner wall of the first inner cavity 5622, a second oil guide groove 509 is formed in an inner wall of the second inner cavity 5642, and an opening direction of the first oil guide groove 507 is staggered from an opening direction of the second oil guide groove 509. So, two are led the not just design of right of oil groove, avoid stray light's interference.

Specifically, in the example of fig. 8, useful light is transmitted through the emitting opening 5282 and the receiving opening 5482, and light emitted through the first oil guide groove 507 is an ineffective interference signal. To avoid the interference of stray light, the first sealing plug 562 can be rotated by an angle around the axis H, or the second sealing plug 564 can be rotated by an angle around the axis H, or the first sealing plug 562 can be rotated by an angle around the axis H and the second sealing plug 564 can be rotated by an angle around the axis H, so that the two oil guiding grooves are in a non-aligned state, the oil guiding function can be satisfied, and the interference of stray light can be avoided.

In the example of fig. 9 and 10, the opening direction of first oil guide groove 507 and the opening direction of second oil guide groove 509 are shifted by 90 degrees. The opening direction of the first oil guide groove 507 is shifted by 90 degrees in the clockwise direction according to the opening direction of the second oil guide groove 509. Or the opening direction of the first oil guide groove 507 is shifted by 90 degrees in the counterclockwise direction according to the opening direction of the second oil guide groove 509. In the example of fig. 9, the second oil guide groove 509 is located at a lower side of the second inner cavity 5642. In the example of fig. 10, the first oil guide groove 507 is located on the rear side of the first inner cavity 5622, and the center axis of the first inner cavity 5622 is located on the same center axis H as the center axis of the second inner cavity 5642.

In other embodiments, the angle of the offset between the opening direction of the first oil guide groove 507 and the opening direction of the second oil guide groove 509 may be 30 degrees, 40 degrees, 50 degrees, 60 degrees, etc., and the offset angle is not limited herein and may be set according to actual requirements. The offset angle is set so that the orthographic projection of first oil guide groove 507 on the plane perpendicular to second oil guide groove 508 does not coincide with the orthographic projection of second oil guide groove 508 on the plane. Alternatively, the offset angle is set so that the orthographic projection of second oil guide groove 508 on the plane perpendicular to first oil guide groove 507 does not coincide with the orthographic projection of first oil guide groove 507 on the plane.

Referring to fig. 11 and 12, in the example of fig. 11 and 12, the axis of the light emitting device 52 and the axis of the light receiving device 54 are located on the same straight line T and intersect the central axis Z of the air outlet 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.

In the illustrated example, the outlet of the check valve 40 is circular, and the central axis Z of the outlet of the check valve 40 may refer to an axis that is perpendicular to the plane of the outlet of the check valve 40 and passes through the center of the circle. In other examples, the outlet of the check valve 40 may be in other regular or irregular shapes, such as square, oval, regular polygon, triangle, etc. For a square, the central axis Z of the outlet mouth of the check valve 40 refers to the axis perpendicular to the plane of the outlet mouth 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 outlet of the check valve 40 may refer to an axis perpendicular to the plane of the outlet of the check valve 40 and passing through any focal point of the oval shape. For regular polygon, the central axis Z of the air outlet of the check valve 40 may refer to an axis perpendicular to the plane where the air outlet of the check valve 40 is located and passing through the center of the circumscribed circle or the inscribed circle of the regular polygon. The central axis Z of the air outlet of the check valve 40 may refer to an axis that is perpendicular to the plane of the air outlet 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, and the like. The central axis of the outlet of the volute tip 324 can be similarly understood in the present invention 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. 11, 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. 11, 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 case where no lens is provided inside the light emitting device 52 and the light receiving device 54The design of (3).

In the example of fig. 11 and 12, the axis of the light emitting device 52 and the 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. 12 is perpendicular to the paper.

In another embodiment, the axis of the light emitting device 52 and the axis of the light receiving device 54 are located on the same straight line that is obliquely arranged with respect to a plane perpendicular to the central axis Z of the check valve 40. For example, the axis of the light emitting device 52 and the 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. 12 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 area of the lampblack air channel 41 of the check valve 40 and is received by the opposite light receiving device 54, and when there is no particulate matter in the area of the air channel, 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 are subjected to centrifugal force of the impeller and pass through the volute 32 to the soot duct 41 of the check valve 40. 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. 13, 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.

It should be noted that, in one embodiment, in the case that the soot detection assembly 50 is disposed at the scroll end 324, the axis of the light emitting device 52 and the axis of the light receiving device 54 are located on the same line and intersect with the central axis of the air outlet of the scroll end 324. In yet another embodiment, in the case where the soot detecting assembly 50 is provided at the scroll end 324 and the check valve 40, the axis of the light emitting device 52 and the axis of the light receiving device 54 provided at the scroll end 324 are located on the same line and intersect with the central axis of the air outlet of the scroll end 324, and the axis of the light emitting device 52 and the axis of the light receiving device 54 provided at the check valve 40 are located on the same line and intersect with the central axis of the air outlet of the check valve 40.

Referring to fig. 14, in the case that the soot detecting assembly 50 is provided at the check valve 40, at least two detecting pairs 51 are provided at the check valve 40. In the example of fig. 14, the smoke detecting assembly 50 includes a plurality of detecting pairs 51, each detecting pair 51 includes one light emitting device 52 and one light receiving device 54, and the axis of the light emitting device 52 and the axis of the light receiving device 54 of each detecting pair 51 are located on the same line and intersect the central axis of the check valve 40. In this way, when the distribution of the soot particles 110 in the inner area of the check valve 40 is not uniform or the concentration of the soot particles 110 is low, the plurality of detection pairs 51 can detect the concentration of the soot particles 110 from different angles, so that the sensitivity of the soot detection assembly 50 can be improved.

Specifically, in the embodiment where only the concentration of the particulate matter on the fixed light path can be detected by providing one detection pair 51, when the pressure of the pipeline at the end of the kitchen appliance 100 changes or the burners on the left and right sides of the gas cooker below the kitchen appliance 100 are not uniformly placed, the presence of the soot particles may not be detected, and the erroneous judgment may occur. Therefore, the arrangement of the plurality of detection pairs 51 can detect the particulate matters from different angles, and the sensitivity of the lampblack detection assembly 50 is improved.

In one embodiment, as shown in fig. 14, the axis of the light emitting device 52 and the axis of the light receiving device 54 of each detection pair 51 are located on the same line and intersect the central axis of the outlet port of the check valve 40, the line being located on a plane perpendicular to the central axis Z of the outlet port of the check valve 40.

In another embodiment, the axis of the light emitting device 52 and the axis of the light receiving device 54 of each detection pair 51 are located with respect to a line that is inclined with respect to a plane perpendicular to the central axis Z of the outlet opening of the check valve 40 and intersects the central axis of the outlet opening of the check valve 40.

It is understood that the plurality of detection pairs 51 are uniformly spaced along the circumference of the check valve 40, and in one embodiment, the spacing angle between two adjacent devices is the same, for example, the spacing angle between one light emitting device 52 and one light receiving device 54 is the same as the spacing angle between two adjacent light emitting devices 52 along the circumference of the check valve 40, and as another example, the spacing angle between two adjacent light receiving devices 54 is the same as the spacing angle between two other adjacent light receiving devices 54. In another embodiment, the separation angles of two adjacent devices may be different, or may be the same for some separation angles and different for some separation angles. During algorithm processing, calibration can be carried out by simulating the actual oil smoke environment.

In the example of fig. 14, the smoke detection assembly 50 includes three detection pairs 51. The interval angle between two adjacent devices is 60 degrees. The light emitted from the light emitting device 52 in each detection pair 51 may pass through the soot air passage area of the check valve 40 and be received by the light receiving device 54 located on the same line.

In other embodiments, the smoke detecting assembly 50 may also include two, four, or more than four detecting pairs 51. The number of detection pairs 51 and the angle of the interval between each detection pair 51 are not limited herein, and can be set according to actual requirements.

It should be noted that, in one embodiment, in the case that the soot detecting assembly 50 is provided at the scroll end 324 and the check valve 40, at least two detecting pairs 51 are provided at the scroll end 324, and at least two detecting pairs 51 are provided at the check valve 40. In another embodiment, where the smoke detection assembly 50 is disposed at the volute end 324, at least two detection pairs 51 are disposed at the volute end 324.

Referring to fig. 15, in the embodiment of fig. 15, the axis T1 of the light emitting device 52 and the axis T2 of the light receiving device 54 are located on different lines, and the intersection angle α formed by the intersection of the axis of the light emitting device 52 and the axis of the light receiving device 54 is (0 °,180 °).

Specifically, in one embodiment, referring to FIG. 15, the axis of the light emitting device 52 and the axis of the light receiving device 54 form a plane that is parallel to or coincident with a plane perpendicular to the central axis Z of the check valve 40. the intersection of the axis of the light emitting device 52 and the axis of the light receiving device 54 forms an angle α that is less than 180 degrees.

In other embodiments, the plane formed by the axis of the light emitting device 52 and the 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 axis of the light emitting device 52 and the axis of the light receiving device 54 intersect to form an angle of less than 180 degrees.

In the example of FIG. 15, the light emitting devices 52 and the light receiving devices 54 are staggered to form an included angle α, and light emitted by the light emitting devices 52 can pass through the interior region of the check valve 40 and be received by the light receiving devices under the scattering effect of the soot particles 110. according to the Mi scattering theory, in the case where the light emitting devices 52 and the light receiving devices 54 are staggered to form a predetermined included angle α, when there is no soot particle 110 in the interior 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 very weak. when there is a soot particle 110 in the interior region of the check valve 40, part of the infrared light emitted by the light emitting devices 52 is received by the light receiving devices 54 under the scattering effect of the infrared light by the soot particles 110, and the intensity of light received by the light receiving devices 54 is very strong.

Referring to fig. 16, in the example of fig. 16, 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.

Referring to fig. 17, the number of the light emitting devices 52 is plural, the number of the light receiving devices 54 is single, the axis of each light emitting device 52 intersects with the axis of the light receiving device 54 at the central axis of the air outlet of the check valve 40, and the angles formed by the intersection of the axis of each light emitting device 52 and the axis of the light receiving device 54 are different, and the range of the angles is (0 °,180 °).

In another embodiment, the axes of each light emitting device 52 and the light receiving device 54 intersect at the same angle.

In yet another embodiment, the angle formed by the intersection of the axis of each light emitting device 52 and the axis of the light receiving device 54 is partially the same and partially different.

In actual operation, one or two or more of the plurality of light emitting devices 52 may be illuminated at the same time, and the light received by the light receiving device 54, the light emitting devices 52 distributed at different positions in the circumferential direction of the check valve may increase the sensitivity of the smoke detecting assembly 50.

Preferably, since the sizes of the soot particles 110 are different, in the embodiment of fig. 17, the included angle formed by the intersection of the axis of each light emitting device 52 and the axis of each light receiving device 54 is different, the kitchen appliance 100 can be used to control the plurality of light emitting devices 52 to be lit for a preset time period according to a preset timing, and the light receiving devices 54 can be used to receive the light emitted by the light emitting devices 52 at different time intervals. Thus, the light receiving device 54 can output a corresponding electrical signal according to the light emitted by the light emitting device 52, the controller of the kitchen appliance 100 is configured to obtain a distribution characteristic of the size of the soot particles 110 within a certain preset time period according to the electrical signal output by the light receiving device 54, for example, the size of the water vapor particles is different from the size of the particles for heating the edible oil, and the distribution characteristic of the size of the soot particles 110 can reflect the cooking habit of the user, so that the kitchen appliance 100 can calculate the oil consumption of the user and the light or heavy taste of the dish.

In addition, the controller of the kitchen appliance 100 can distinguish between the water vapor and the soot particles 110 and select different operating states of the fan 34 according to the distribution characteristic analysis of the size of the soot particles 110. Simultaneously, can remind the user to wash fan assembly 30's oil cup and impeller according to the oil mass that the analysis is derived to can guide the reasonable healthy culinary art of user propelling movement according to the distribution characteristic of particulate matter size. The reminding information may be a sound device or a light device of the kitchen appliance 100, or may be a wireless or wired message that is sent to the client terminal to remind the client terminal. Client terminals include, but are not limited to, cell phones, tablets, personal computers, wearable smart devices, or other types of household appliances, and the like.

For example, for a user whose cooking habit is mainly heavy oil smoke, the reminding time period can be set to be shorter, and accordingly, some healthy cooking directions of light oil smoke can be pushed. For the user with the cooking habit mainly based on cooking, the reminding duration can be set to be longer, and some healthy cooking menus can be pushed.

In the example of fig. 17, the number of the light emitting devices 52 is 3, the number of the light receiving devices 54 is 1, and the axis of the first light emitting device 52A intersects with the axis of the light receiving device 54 at an angle of 120 degrees. The axis of the second light emitting device 52B intersects the axis of the light receiving device 54 at an angle of 60 degrees. The axis of the third light emitting device 52C intersects the axis of the light receiving device 54 at an angle of 30 degrees.

Specifically, the controller of the kitchen appliance 100 may control the first light-emitting device 52A to be turned off after being turned on for a first predetermined period of time, then control the second light-emitting device 52B to be turned off after being turned on for a second predetermined period of time, and then control the third light-emitting device 52C to be turned off after being turned on for a third predetermined period of time, the light-receiving device 54 sequentially receives light emitted from the first light-emitting device 52A and processes light emitted from the first light-emitting device 52A for the first predetermined period of time to output corresponding electrical signals, receives light emitted from the second light-emitting device 52B and processes light emitted from the second light-emitting device 52B for the second predetermined period of time to output corresponding electrical signals, and receives light emitted from the third light-emitting device 52C and processes light emitted from the third light-emitting device 52C for the third predetermined period of time to output corresponding electrical signals.

Fig. 18 is a diagram showing a driving current and time of the light emitting devices, and in the example of fig. 18, the first light emitting device 52A is driven to emit light within 0 to 1ms, while the light receiving device 54 receives the light emitted from the first light emitting device 52A within 0 to 1ms, and processes the light emitted from the first light emitting device 52A within 1 to 2ms to output an electric signal of a phase. The second light emitting device 52B is driven to emit light within 2-3ms, and the light receiving device 54 receives the light emitted from the second light emitting device 52B within 2-3ms and processes the light emitted from the second light emitting device 52B within 3-4ms to output a corresponding electrical signal. The third light emitting device 52C is driven to emit light within 4-5ms, while the light receiving device 54 receives light emitted from the third light emitting device 52C within 4-5ms and processes the light emitted from the third light emitting device 52C within 5-6ms to output a corresponding electrical signal. The first light emitting device 52A is driven to emit light within 6-7ms, while the light receiving device 54 receives light emitted from the first light emitting device 52A within 6-7ms and processes the light emitted from the first light emitting device 52A within 7-8ms to output a corresponding electrical signal. The second light emitting device 52B is driven to emit light within 8-9ms, and the light receiving device 54 receives the light emitted from the second light emitting device 52B within 8-9ms, and processes the light emitted from the second light emitting device 52B within 9-10ms to output a corresponding electrical signal. The third light emitting device 52C is driven to emit light within 10-11ms, while the light receiving device 54 receives light emitted from the third light emitting device 52C within 10-11ms and processes the light emitted from the third light emitting device 52C within 11-12ms to output a corresponding electrical signal. By analogy, the kitchen appliance 100 controls the air volume of the fan 34 according to the electric signal output by the light receiving device 54.

Referring to fig. 19, in the embodiment of fig. 19, the kitchen appliance 100 includes a driving device 90 connected to the smoke detecting assembly 50, and the driving device 90 is used for driving at least one of the light emitting device 52 and the light receiving device 54 to move relative to the check valve 40. In this way, the lampblack detection assembly 50 can drive at least one of the light emitting device 52 and the light receiving device 54 to move relative to the check valve 40 according to the distribution of the lampblack particles 110 in the check valve 40, so that the lampblack detection assembly 50 can more accurately detect the concentration of the lampblack particles 110, and the structure is simple. In other embodiments, where the smoke detection assembly 50 is disposed at the volute end 324, the driving device 90 is configured to drive at least one of the light emitting device 52 and the light receiving device 54 to move relative to the volute end 324, and where the smoke detection assembly 50 is disposed at the volute end 324 and the check valve 40, the driving device 90 is configured to drive at least one of the light emitting device 52 and the light receiving device 54 to move relative to the volute end 324 and the check valve 40.

In the example of fig. 19, the driving device 90 may drive the light emitting device 52 to move in the circumferential direction of the check valve 40 while the light receiving device 54 remains stationary. In another embodiment, the driving device 90 may drive the light receiving device 54 to move in the circumferential direction of the check valve 40 while the light emitting device 52 remains stationary. In yet another embodiment, the driving device 90 may drive both the light emitting device 52 and the light receiving device 54 to move in the circumferential direction of the check valve 40.

In the embodiment of fig. 19, the driving device 90 includes a motor (not shown) and a transmission assembly 92, and the motor is connected to at least one of the light emitting device 52 and the light receiving device 54 through the transmission assembly 92. In this way, the driving of the light emitting device 52 and/or the light receiving device 54 by the motor can be realized through the transmission assembly 92, so that the positional configuration of the driving device 90 and the light emitting device 52 and the light receiving device 54 and the power output of the driving device 90 are more flexible.

Specifically, the driving device 90 can be controlled by a controller of the kitchen appliance 100, and the angle adjustment can realize the functions of self-calibration of the soot detection assembly 50, detection of the size distribution of the soot particles 110, and the like. The transmission assembly 92 includes a transmission rack 924 and a transmission gear 922 engaged with the transmission rack 924, a driving shaft of the motor is connected to the driving gear 922, and the motor drives the transmission gear 922 to rotate so that the transmission rack 924 drives at least one of the light emitting device 52 and the light receiving device 54 to move along the circumferential direction of the check valve 40. As shown in fig. 19, the light emitting device 52 is mounted on the driving rack 924, and the motor drives the gear 922 to rotate so that the driving rack 924 drives the light emitting device 52 to rotate along the circumferential direction of the check valve 40, for example, the axis of the light emitting device 52 and the axis of the light receiving device 54 intersect to form an included angle of 120 degrees to 150 degrees under the driving of the driving device 90. In other embodiments, the driving device may be hydraulic, pneumatic, etc.

In the example of fig. 12, the light emitting device 52 and the light receiving device 54 may also be simultaneously connected to the driving device 90, and the driving device 90 may simultaneously drive the light emitting device 52 and the light receiving device 54 to move in the circumferential direction of the check valve 40 on the same straight line disposed perpendicular to the plane of the check valve central axis Z. Thus, the problem of low accuracy of detecting the concentration of the soot particles 110 due to uneven distribution of the soot particles 110 can be avoided.

In the example of fig. 17, the light emitting device 52 and the light receiving device 54 may also be simultaneously connected to the driving device 90, and the driving device 90 drives each of the light emitting device 52 and the light receiving device 54 to move along the axis of the check valve 40 to change the angle formed by the intersection of the axis of each of the light emitting device 52 and the axis of the light receiving device 54.

In other embodiments, the transmission assembly 92 may also include belts, chains, gear boxes, screws, pulleys, slides, and the like. The utility model discloses do not inject the concrete structural style of drive assembly.

It should be noted that in other embodiments, the driving device 90 may also be used to drive at least one of the light emitting device 52 and the light receiving device 54 to move relative to the volute end 324 or relative to the volute end 324 and the check valve 40, which will not be described herein.

Referring to fig. 20, in the example of fig. 20, the kitchen appliance 100 includes a light reflecting member 120 disposed on an inner wall of the check valve 40, and the light reflecting member 120 is used for reflecting the light emitted from the light emitting device 52 to the smoke duct 41 and/or the light receiving device 54 of the check valve 40.

Specifically, in the case that the soot particles 110 entering the inner area of the check valve 40 from the air outlet of the scroll casing 32 are not uniformly distributed, the light emitted from the light emitting device 52 is difficult to scatter with the soot particles 110 in the soot air outlet of the check valve 40, in the example of fig. 20, multiple reflections can be formed in the check valve 40 by the light reflecting member 120, the light path can be increased by several hundred times, an optical labyrinth is formed, and thus the probability of meeting the light with the soot particles 110 is greatly increased, and thus, the sensitivity of the soot detection assembly 50 can be significantly increased. In some cases, the light reflecting member 120 reflects the light emitted from the light emitting device 52 to the soot air passage 41 of the check valve 40 or the light receiving device 54, and in some cases, the light reflecting member 120 reflects the light emitted from the light emitting device 52 to the soot air passage 41 of the check valve 40 and the light receiving device 54.

In the example of fig. 20, the light reflecting member 120 is in the same plane perpendicular to the check valve central axis Z as the light emitting device 52 and the light receiving device 54. The axis of the light emitting device 52 intersects the axis of the light receiving device 54 at an angle of 120 degrees. The light reflecting member 120 includes a first member 122 and a second member 124 connected, and the connection of the first member 122 and the second member 124 connects the inner wall of the check valve 40. In one embodiment, the first member 122 and the second member 124 are perpendicular to each other. In other embodiments, the angle formed by the connection of the first member 122 and the second member 124 can be set according to actual requirements, and is not limited herein. The light reflecting member 120 may also be a light reflecting coating formed on the inner wall of the check valve 40. In addition, in order to ensure the reflecting effect, an oil-proof layer can be formed on the reflecting piece.

Specifically, the material of the light reflecting member 120 includes, but is not limited to, metal, glass, and plastic. In one embodiment, the material of the reflector 120 is PVC (Polyvinyl chloride).

In other embodiments, a reflector 120 may be disposed on the inner wall of the check valve 40 of fig. 12, 17 and 19, so that the infrared light emitted from the light emitting device 52 may pass through the inner region of the check valve 40 and be received by the infrared light receiving device 54 located on the same straight line more by the action of the reflector 120.

It should be noted that, in another embodiment, in the case that the light reflecting member 120 is disposed at the end 324 of the volute, the light reflecting member 120 may be used to reflect the light emitted from the light emitting device 52 to the lampblack air channel 322 and/or the light receiving device 54 at the end 324 of the volute. In the case where the light reflecting member 120 is disposed at both the scroll end 324 and the check valve 40, the light reflecting member 120 may be used to reflect the light emitted from the light emitting device 52 to at least one of the soot air passage 322 of the scroll end 324 and the soot air passage 41 of the check valve 40 and the light receiving device 54.

In fig. 12, 14, 15, 17, 19, and 20, 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 configured to output 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 duct 41 of the check valve 40, and the sensitivity of the smoke detection unit 50 can be 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. 21, 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. 21, 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.

To sum up, the utility model discloses kitchen appliance 100 of embodiment includes box 20, check valve 40 and oil smoke detection subassembly 50, be equipped with fan subassembly 30 in the box 20, check valve 40 connects at box 20, fan subassembly 30 includes spiral case 32 and establishes fan 34 in spiral case 32, oil smoke detection subassembly 50 is established at wind channel end 210, oil smoke detection subassembly 50 includes light emitting device 52 and light receiving device 54, light emitting device 52 is used for the oil smoke wind channel transmission light to wind channel end 210, light receiving device 54 is used for receiving the light that light emitting device 52 transmitted.

The utility model discloses in kitchen appliance 100 of embodiment, through establishing light emitting device 52 and light receiving device 54 at wind channel end 210, the terminal interior oil smoke granule 110 of wind channel can influence the power that light receiving device 54 received the light of light emitting device 52 transmission and make the signal of telecommunication of light receiving device 54 output change when culinary art, kitchen appliance 100 of this embodiment can be according to the operation of the signal of telecommunication control fan 34 of light receiving device 54 output, make like this that fan 34 can provide suitable amount of wind in order to absorb oil smoke granule 110, it is effectual to absorb oil smoke granule 110, the degree of accuracy is high.

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 limitations of the present invention.

In the description of the present 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 embodiments or examples 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, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention, the scope of which is defined by the claims and their equivalents.

Claims (16)

1. The utility model provides a kitchen appliance, its characterized in that, kitchen appliance includes box and oil smoke determine module, be equipped with fan subassembly in the box, fan subassembly includes the spiral case and establishes fan in the spiral case, oil smoke determine module establishes at the wind channel end, oil smoke determine module includes light emitting device and light receiving device, light emitting device be used for to terminal oil smoke wind channel emission light in wind channel, light receiving device is used for receiving the light of light emitting device transmission.

2. The kitchen appliance of claim 1, wherein the duct end includes a check valve and a volute end, the smoke detection assembly being disposed at least one of the check valve and the volute end.

3. The kitchen appliance according to claim 1, wherein the kitchen appliance includes a baffle assembly, the box is disposed on the baffle assembly, and the kitchen appliance is configured to control the operation of the fan assembly and the baffle assembly and/or the reminding of the oil amount information of the kitchen appliance according to the electrical signal output by the light receiving device.

4. The kitchen appliance according to claim 2, wherein in the case that the soot detecting assembly is provided at the end of the scroll casing and the check valve, the axis of the light emitting device and the axis of the light receiving device provided at the end of the scroll casing are located on the same line and intersect with the central axis of the air outlet at the end of the scroll casing, and the axis of the light emitting device and the axis of the light receiving device provided at the check valve are located on the same line and intersect with the central axis of the air outlet of the check valve;

under the condition that the oil smoke detection assembly is arranged at the tail end of the volute, the axis of the light emitting device and the axis of the light receiving device are positioned on the same straight line and are intersected with the central axis of the air outlet at the tail end of the volute;

under the condition that the oil smoke detection assembly is arranged on the check valve, the axis of the light emitting device and the axis of the light receiving device are located on the same straight line and are intersected with the central axis of the air outlet of the check valve.

5. The kitchen appliance according to claim 2, wherein said smoke detection assembly comprises a plurality of detection pairs, each detection pair comprising one said light emitting device and one said light receiving device, at least two said detection pairs being provided at said volute end and at least two said detection pairs being provided at said check valve, with said smoke detection assembly being provided at said volute end and said check valve;

under the condition that the oil smoke detection assembly is arranged at the tail end of the volute, at least two detection pairs are arranged at the tail end of the volute;

under the condition that the oil smoke detection assembly is arranged on the check valve, at least two detection pairs are arranged on the check valve.

6. The kitchen appliance according to claim 5, wherein the axis of the light emitting means and the axis of the light receiving means of each detection pair are located on the same line and intersect the central axis of at least one of the outlet opening of the volute end and the outlet opening of the check valve.

7. The kitchen appliance according to claim 1, wherein the axis of the light emitting means and the axis of the light receiving means are located in different lines, and the intersection angle formed by the intersection of the axis of the light emitting means and the axis of the light receiving means is in the range of (0 °,180 °).

8. The kitchen appliance of claim 2, wherein the kitchen appliance includes a drive device coupled to the smoke detection assembly for driving at least one of the light emitting device and the light receiving device to move relative to the check valve, or relative to the volute end and the check valve.

9. The kitchen appliance according to claim 2, wherein the number of the light emitting devices is plural, the number of the light receiving devices is single, the axis of each light emitting device intersects with the axis of the light receiving device at the central axis of the air outlet at the end of the volute and/or the central axis of the air outlet of the check valve, and the included angles formed by the intersection of the axis of each light emitting device and the axis of the light receiving device are different, or are the same, or are partially the same, and are partially different, and the included angles range from (0 ° to (180 °).

10. The kitchen appliance according to claim 2, wherein the kitchen appliance includes a light reflector disposed at an end of the volute and at least one inner wall of the check valve, the light reflector being configured to reflect light emitted from the light emitting device to at least one of the soot duct at the end of the volute, the soot duct of the check valve, and the light receiving device.

11. The kitchen appliance according to claim 2, wherein the light emitting means comprises a first sealing plug, a transmitting portion and a first circuit board, the first sealing plug is mounted on the first circuit board, the first sealing plug is formed with a first inner cavity, the transmitting portion is located in the first inner cavity and disposed on the first circuit board, at least one of the check valve and the end of the scroll casing is provided with a first through hole, and the first sealing plug is partially disposed in the first through hole.

12. The kitchen appliance according to claim 11, wherein the light emitting device comprises a first lens disposed in the first inner cavity and located on the light emitting path of the emitting portion, the first lens being configured to emit the light emitted from the emitting portion in parallel.

13. The kitchen appliance according to claim 2, wherein the light receiving means comprises a second sealing plug, a receiving portion and a second circuit board, the second sealing plug is mounted on the second circuit board, the second sealing plug is formed with a second inner cavity, the receiving portion is located in the second inner cavity and is disposed on the second circuit board, at least one of the check valve and the end of the scroll casing is provided with a second through hole, and the second sealing plug is partially disposed on the second through hole.

14. The kitchen appliance according to claim 13, wherein the light receiving means comprises a second lens disposed within the second cavity and on the receiving light path of the receiving portion, the second lens being configured to focus light entering from the second cavity to the receiving portion.

15. The kitchen appliance according to claim 1, wherein said light emitting means comprises a first sealing plug having a first end defining a light emitting opening, and said light receiving means comprises a second sealing plug having a second end defining a light receiving opening, said light receiving opening having a diameter greater than a diameter of said light emitting opening.

16. The kitchen appliance according to claim 1, wherein the light emitting device comprises an emitting portion and a first sealing plug, a first inner cavity is formed in the first sealing plug, the emitting portion is at least partially located in the first inner cavity, a first oil guide groove is formed in an inner wall of the first inner cavity, the light receiving device comprises a receiving portion and a second sealing plug, a second inner cavity is formed in the second sealing plug, the receiving portion is at least partially located in the second inner cavity, a second oil guide groove is formed in an inner wall of the second inner cavity, and an opening direction of the first oil guide groove is staggered with an opening direction of the second oil guide groove.

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