An oil fume sensor and an oil fume extractor

Abstract

The utility model relates to a kind of oil fume sensor and extractor hood, and oil fume sensor includes shell and the sensor main body installed in shell interior;The two sides of shell are respectively connected with the light path channel with opening, light path channel is installed with light transmission element, and light transmission element and shell form enclosed containing space;Sensor main body is installed in containing space, and sensor main body includes two photoelectric transceiver components, and each photoelectric transceiver component includes light emitter and light receiver, and two photoelectric transceiver components are respectively oriented light transmission element in two light path channels.The utility model can detect the oil fume concentration of the air duct above two cookers simultaneously with only one sensor, two photoelectric transceiver components share one shell and one circuit device, which can reduce the cost of sensor and the overall cost of extractor hood, and the sensor adopts symmetrical design, the oil fume concentration detection accuracy in two directions is consistent, which can avoid algorithm error and improve the accuracy of oil fume detection.

Description

Technical Field

[0001] This utility model relates to the field of oil fume sensor technology, and in particular to an oil fume sensor and an oil fume hood. Background Technology

[0002] Currently, to detect the concentration of cooking fumes above different burners on a cooktop, independent fume sensors need to be installed on both sides of the duct in the range hood. These two separate sensors complicate the wiring, increasing the cost and structural design complexity. While some technologies use a single fume sensor combined with an algorithm to calculate the fume concentration above both burners, this approach has varying accuracy and significant errors in identifying the fume concentration above different burners. Summary of the Invention

[0003] In order to solve at least one of the technical problems mentioned above, this utility model proposes an oil fume sensor and an oil fume hood.

[0004] According to some embodiments of the present invention, an oil fume sensor is provided. The oil fume sensor includes a housing and a sensor body installed inside the housing. Optical path channels with openings are respectively connected to both sides of the housing. A light-transmitting element is installed within the optical path channel, and the light-transmitting element and the housing form a closed accommodating space. The sensor body is installed in the accommodating space and includes two photoelectric transceiver components. Each photoelectric transceiver component includes a light emitting device and a light receiving device, and the two photoelectric transceiver components are respectively oriented towards the light-transmitting elements in the two optical path channels.

[0005] Based on the above solution, only one sensor is needed to simultaneously detect the oil fume concentration in the air ducts above two stoves. The two photoelectric transceiver components share a housing and a circuit device, which can reduce the cost of the sensor and the overall cost of the range hood. Furthermore, the sensor adopts a symmetrical design, ensuring consistent detection accuracy of oil fume concentration in both directions, thus avoiding algorithm errors and improving the accuracy of oil fume detection.

[0006] In some possible implementations, a first light-blocking element is provided inside the housing, which is used to isolate the light emitting device and the light receiving device.

[0007] Based on the above solution, the first light-blocking component can isolate the light emitting device and the light receiving device from each other, preventing the light from the light emitting device from being directly received by the light receiving device, thereby improving the accuracy of oil fume detection.

[0008] In some possible implementations, a second light-blocking element is provided inside the housing, which is used to isolate the two optoelectronic transceiver components.

[0009] Based on the above scheme, the second light-blocking component can separate the two optoelectronic transceiver components from each other, avoid coupling interference between the two optoelectronic transceiver components, and ensure the detection accuracy of the two optoelectronic transceiver components.

[0010] In some possible implementations, the cross-sectional area of ​​the end of the optical path channel closer to the housing is greater than the cross-sectional area of ​​the end of the optical path channel farther from the housing.

[0011] Based on the above scheme, the optical path channel is a variable channel with a larger near end and a smaller far end, which can reduce the possibility of oil fumes entering the optical path channel and contaminating the light-transmitting element, and ensure that the oil fume sensor can work effectively for a long time.

[0012] In some possible implementations, the opening of the optical path channel is oriented horizontally downwards.

[0013] Based on the above scheme, the optical path channel is designed to be angled downwards. On the one hand, this can reduce the amount of oil fume entering the optical path channel, and on the other hand, it can help the oil fume condensate entering the optical path channel to flow out, thereby ensuring the long-term effective operation of the oil fume sensor and enhancing the stability of the sensor.

[0014] In some possible implementations, the distance between the bottom of the opening of the optical path channel and the housing is greater than or equal to the distance between the top of the opening of the optical path channel and the housing.

[0015] Based on the above solution, the inclined design of the optical path channel opening helps to block the oily fumes drifting from below to above, reducing the possibility of oily fumes entering the optical path channel.

[0016] In some possible implementations, the optical path channel is detachably connected to the housing.

[0017] Based on the above solution, the optical path channel is designed to be detachable. After the optical path channel is contaminated, it can be directly disassembled for cleaning or replaced, which helps to reduce the cost of use.

[0018] In some possible implementations, the light-transmitting element includes a collimating lens and a condensing lens, with the light emitting device aligned with the collimating lens and the light receiving device aligned with the condensing lens.

[0019] Based on the above scheme, the collimating lens can convert the emitted light from the light emitting device into collimated light, while the focusing lens can focus the light reflected from the oil fume onto the light receiving device. The accuracy of oil fume detection can be improved through the light-transmitting element.

[0020] In some possible implementations, the sensor body includes a circuit board electrically connected to the two optoelectronic transceivers. The circuit board integrates a drive circuit, a signal processing circuit, and a processor. The circuit board is connected to a terminal block via wires, and the terminal block is used to connect to the controller of the range hood.

[0021] Based on the above scheme, the circuit board of the sensor body has signal processing function, which can calculate and process the signals of the two photoelectric transceiver components, resulting in a high degree of integration of the fume sensor.

[0022] According to some embodiments of the present invention, a range hood is provided, including a turbine fan and a fume sensor as described in any of the above embodiments. The turbine fan includes a volute, the fume sensor is mounted on the front wall of the volute, and the fume sensor is located in the middle of the air duct.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the present invention.

[0024] Other features and aspects of the present invention will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0025] To more clearly illustrate the technical solutions and advantages in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A plan view of a first structure of an oil fume sensor according to an embodiment of the present invention is shown; Figure 2 A perspective view of a second structure of an oil fume sensor according to an embodiment of the present invention is shown. Figure 3 A partial part drawing of a second structure of an oil fume sensor according to an embodiment of the present invention is shown; Figure 4 An exploded view of a second structure of the fume sensor according to an embodiment of the present invention is shown; Figure 5 This diagram shows the installation location of the fume sensor on a range hood according to an embodiment of the present invention.

[0027] In the picture, 1-Housing; 2-Lens protective cover; 3-Upper light shield; 4-Optical path channel; 5-Lens base; 6-Light-transmitting element; 7-Lower light shield; 8-Sensor body; 9-Photoelectric transceiver assembly; 10-First light shield; 20-Second light shield. Detailed Implementation

[0028] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0030] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0031] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0032] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0033] Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this utility model.

[0034] Currently, some range hoods are equipped with photoelectric fume sensors, which use the principle of infrared scattering to detect changes in the concentration of particulate matter in the range hood's duct. Photoelectric sensors have advantages such as simple circuitry, low cost, and fast response speed. Furthermore, through structural and hardware / software design, their resistance to oil stains can be improved, meeting the requirements of the unique and harsh working conditions of range hoods.

[0035] To detect the coverage of oil fumes on different burners of a cooktop, two common technologies employ two approaches. The first approach involves installing independent oil fume sensors on both sides of the range hood's duct, with each sensor detecting the oil fume concentration above one burner. However, this increases the complexity of the range hood's wiring, raising its cost and structural design. The second approach involves placing an oil fume sensor diagonally on one side of the duct, using an algorithm to calculate the oil fume concentration above the two burners. However, this approach suffers from inconsistent detection accuracy for the oil fumes above the two burners, resulting in inaccurate detection for one burner but not the other, leading to significant errors. Furthermore, the algorithm design is more complex, further increasing costs.

[0036] To address the aforementioned technical problems, this invention provides an oil fume sensor. This oil fume sensor incorporates two sets of optical path components on top of a single circuit assembly. These two sets of optical path components detect oil fumes from two different directions. Compared to using two independent sensors, this invention's oil fume sensor is less expensive and has lower structural requirements for the range hood. The oil fume sensor can be directly mounted on the volute of the turbine fan to detect the air ducts of both burners, offering good compatibility and high detection accuracy.

[0037] Please refer to Figures 1-4The oil fume sensor of this embodiment includes a housing 1 and a sensor body 8 installed inside the housing 1. The housing 1 has at least two open optical path channels 4. A light-transmitting element 6 is installed in any one of the optical path channels 4. The light-transmitting element 6 and the housing 1 form a closed accommodating space. The sensor body 8 is installed in the accommodating space and includes at least two photoelectric transceiver components 9. The at least two photoelectric transceiver components 9 correspond one-to-one with the at least two optical path channels 4. Each photoelectric transceiver component 9 faces the light-transmitting element 6 in the corresponding optical path channel 4. Each photoelectric transceiver component 9 includes a light emitting device and a light receiving device. The working principle of the oil fume sensor based on the above structure includes that for any photoelectric transceiver component 9, the light emitted by its light emitting device passes through the light-transmitting element 6 and is directed towards the smoke gas to be detected. The smoke gas then reflects the light, and the reflected light passes through the light-transmitting element 6 and is detected by the light receiving device. The light receiving device sends a feedback signal of corresponding intensity / magnitude to the sensor body 8 according to the received light intensity. The sensor body 8 processes and analyzes the feedback signal to determine the oil fume concentration in the direction of the optical path channel 4 where the photoelectric transceiver component 9 is located.

[0038] The oil fume sensor of this embodiment has multiple photoelectric transceiver components 9 on a sensor body 8. The multiple photoelectric transceiver components 9 can simultaneously detect the oil fume concentration in multiple different directions. The multiple photoelectric transceiver components 9 share a housing 1 and a sensor body 8 (i.e., circuit devices). Compared with setting multiple independent sensors, the oil fume sensor of this embodiment has a small overall size while having multi-directional oil fume measurement function. Moreover, the oil fume sensor has only one sensor body 8, which means fewer sensor lines. When installing the sensor, the range hood does not need to consider the wiring and installation structure of multiple sensors, which can reduce the design difficulty and overall cost of the range hood. The oil fume sensor has good application compatibility.

[0039] In this embodiment, the housing 1 adopts a flat design, that is, the thickness of the housing 1 is small, so as to facilitate installation in narrow gaps, such as the volute of a range hood.

[0040] In this embodiment, the light-transmitting element 6 is mounted on the lens base 5. The light-transmitting element 6 includes a collimating lens and a condensing lens, which are mounted side-by-side on the lens base 5. The light emitting device is aligned with the collimating lens, and the light receiving device is aligned with the condensing lens. This embodiment does not limit the positions of the light emitting and receiving devices. In some cases, the light emitting device can be positioned above the light receiving device; in other cases, it can be positioned below the light receiving device. The positions of the collimating lens and the condensing lens in the light-transmitting element 6 are determined based on the positions of the light emitting and receiving devices. Based on the above structure of the light-transmitting element 6, the collimating lens can convert the emitted light from the light emitting device into collimated light, and the condensing lens can focus the light reflected from the oil fume onto the light receiving device. The light-transmitting element 6 can improve the accuracy of oil fume detection.

[0041] It should be understood that this embodiment does not limit the collimating lens or condenser lens to a single lens. That is, the collimating lens can be a lens group formed by stacking multiple lenses. Similarly, the light-transmitting element 6 can be a component including multiple optical lenses.

[0042] In a further embodiment, a lens protective cover 2 is provided on the side of the lens base 5 that is not connected to the lens. The lens protective cover 2 is used to protect the collimating lens and the condensing lens so that the collimating lens and the condensing lens do not come into direct contact with the oil fume gas.

[0043] In this embodiment, the sensor body 8 includes a circuit board electrically connected to multiple photoelectric transceiver components 9. The circuit board integrates a drive circuit, a signal processing circuit, and a processor. The circuit board is connected to a terminal block via wires, which is used to connect to the controller of a range hood. The drive circuit drives a light emitting device to emit light of a specified intensity. The signal processing circuit is connected to a light receiving device. After receiving light reflected from the smoke, the light receiving device generates a feedback signal. The signal processing circuit filters and converts this feedback signal, then sends the processed signal to the processor. The processor obtains the smoke concentration in the detection direction of the photoelectric transceiver components 9 and generates detection result data. Based on this scheme, the circuit board of the sensor body 8 has signal processing capabilities, enabling it to calculate and process the signals from multiple photoelectric transceiver components 9, directly obtaining smoke concentration detection results in multiple directions. The sensor body 8 can convert the detection results into digital signals and send them to the controller of the target device, such as the controller of a range hood, via a communication line. Because the sensor body 8 can independently identify the smoke concentration detection results, the smoke sensor has a high degree of integration, enhancing its application flexibility and compatibility.

[0044] In this embodiment, the number of optical paths 4 on the fume sensor is not limited. Specifically, there can be two or more optical paths 4. In practical applications, the number of optical paths 4 is related to the number of detection directions of the fume sensor. For example, when it is necessary to detect the fume concentration in two different directions simultaneously, the fume sensor can be configured with 2*n optical paths 4, where n is an integer greater than or equal to 1. Similarly, when it is necessary to detect the fume concentration in k different directions simultaneously, the fume sensor can be configured with 2*n*k optical paths 4, where k is an integer greater than or equal to 2.

[0045] In this embodiment, the orientation of the optical path channels 4 is not limited. Specifically, the multiple optical path channels 4 can be arranged regularly or irregularly. In practical applications, the orientation of the multiple optical path channels 4 is set according to the actual detection direction requirements. For example, in some cases, when the concentration of oil fume around the target object is required, the oil fume sensor can be equipped with two or more optical path channels 4. The two or more optical path channels 4 can be evenly distributed, such as evenly arranged circumferentially or evenly spaced along a straight line. Based on the evenly distributed optical path channels 4, relatively uniform and dense oil fume concentration information can be obtained to achieve the purpose of environmental detection. In other cases, when it is necessary to detect the oil fume concentration in both the horizontal and vertical directions simultaneously, the oil fume sensor can be equipped with at least two optical path channels 4, at least one of which is horizontally oriented and at least one of which is vertically oriented. In this case, the two optical path channels 4 are irregularly arranged.

[0046] In some embodiments, the fume sensor can be applied in a range hood. The fume sensor is used to simultaneously detect fumes in the ducts above two burners. In this case, the fume sensor can be equipped with two optical paths 4, which are respectively connected to both sides of the housing 1. The two optical paths 4 adopt a symmetrical distribution structure. The sensor body 8 inside the housing 1 includes two photoelectric transceiver components 9, which face the light-transmitting elements 6 in the two optical paths 4. Based on the above scheme, only one sensor is needed to simultaneously detect the fume concentration in the ducts above two cooktops. The two photoelectric transceiver components 9 share a housing 1 and a circuit device, which can reduce the cost of the sensor and the overall cost of the range hood. Furthermore, the symmetrical design of the sensor ensures consistent fume concentration detection accuracy in both directions, avoiding the influence of algorithm errors and improving the accuracy of fume detection.

[0047] In this embodiment, a first light-blocking component 10 is provided inside the housing 1. The first light-blocking component 10 is used to isolate the light emitting device and the light receiving device. Based on the above solution, the first light-blocking component 10 can isolate the light emitting device and the light receiving device from each other, preventing the light from the light emitting device from being directly received by the light receiving device, thereby improving the accuracy of oil fume detection.

[0048] This embodiment does not impose specific limitations on the structure of the first light-blocking element 10. In some possible cases, please refer to... Figure 1 The first light-blocking component 10 can be configured as a light-blocking plate, located between the light emitting device and the light receiving device, with the light emitting device positioned above the light receiving device. The length of the light-blocking plate is greater than the lengths of both the light emitting and receiving devices. The light-blocking plate is connected to the light-transmitting element 6, dividing the accommodating space of the photoelectric transceiver assembly 9 into two subspaces, with the light emitting device and the light receiving device located in separate subspaces. Based on the aforementioned light-blocking plate, the light emitted by the light emitting device can only penetrate through the upper half of the light-transmitting element 6 and illuminate the opening of the optical path channel 4. The light reflected from the smoke gas enters the optical path channel 4 through the opening, passes through the lower half of the light-transmitting element 6, and is received and identified by the light receiving device. The light emitting device and the light receiving device are mutually isolated, which can solve the problem of optical coupling error and improve the accuracy of oil fume concentration detection.

[0049] In a further embodiment, a second light-blocking element 20 is also provided inside the housing 1. The second light-blocking element 20 is used to isolate the two optoelectronic transceiver components 9. Based on the above scheme, the second light-blocking element 20 can separate the two optoelectronic transceiver components 9 from each other, avoid coupling interference between the two optoelectronic transceiver components 9, and ensure the detection accuracy of the two optoelectronic transceiver components 9.

[0050] This embodiment does not impose specific limitations on the structure of the second light-blocking element 20; please refer to [reference needed]. Figure 1 The second light-blocking component 20 can also be configured as a light-blocking plate. The light-blocking plate of the first light-blocking component 10 is arranged horizontally, and the light-blocking plate of the second light-blocking component 20 is arranged vertically. The first end of the light-blocking plate of the first light-blocking component 10 is connected to the light-transmitting element 6, and the second end of the light-blocking plate of the first light-blocking component 10 is connected to the light-blocking plate of the second light-blocking component 20. The light-blocking plate of the first light-blocking component 10, the light-blocking plate of the second light-blocking component 20, and the light-transmitting element 6 divide the accommodating space where the optoelectronic transceiver component 9 is located into two closed subspaces. The light emitting device and the light receiving device are located in the two closed subspaces respectively.

[0051] Based on the above structure, the light emitting device and the light receiving device in the photoelectric transceiver assembly 9 are completely isolated, and the two photoelectric transceiver assemblies 9 are also separated by the light-blocking plates of the two second light-blocking components 20. This ensures that no light receiving device is coupled and interfered with by the light emitting device in its own photoelectric transceiver assembly 9, nor by the light emitting devices in other photoelectric transceiver assemblies 9, thus significantly improving the accuracy of oil fume detection. Furthermore, the light-blocking plates of the first light-blocking component 10, in conjunction with the light-blocking plates of the second light-blocking component 20, divide the internal space of the housing 1 into five parts. The middle part is used to place the sensor body 8, and the four parts on both sides respectively place the photoelectric devices in the two photoelectric transceiver assemblies 9. The four parts on both sides are evenly distributed outside the middle part, which helps to improve structural strength and thus ensure the reliability of the oil fume sensor.

[0052] In some embodiments, in addition to the light-blocking plate described above, the first light-blocking element 10 can also be configured as a light-blocking cover, which is fixedly installed inside the housing 1. Please refer to... Figures 3-4 The light shield consists of an upper light shield 3 and a lower light shield 7. Two isolated mounting channels are provided within the light shield, with the light emitting device and the light receiving device located in separate channels. The angular direction of each mounting channel is consistent with the angular direction of the corresponding optical path channel 4, and the two mounting channels are parallel to each other. This structure completely encloses both the light emitting and receiving devices. The light emitting device is located in one mounting channel facing the optical path channel 4, ensuring unidirectional light emission. This prevents light scattering and interference with the light receiving device, and also improves the collimation of the emitted light, thus enhancing the accuracy of oil fume concentration detection. Similarly, the light receiving device is located in the other mounting channel facing the optical path channel 4. Light reflected from the smoke travels through the optical path channel 4 to the mounting channel containing the light receiving device. The light receiving device will not receive interference light from other directions, thus preventing optical coupling interference errors.

[0053] It should be understood that the light shield of the above structure also serves as the second light shield 20. Since the light emitting device and the light receiving device are located in independent unidirectional opening installation channels, the light of the light emitting device will not escape, and the light receiving device will not receive interference light from other directions. Therefore, the light emitting device will not interfere with the other set of light receiving devices, that is, there will be no mutual interference between the two sets of optoelectronic transceiver components 9.

[0054] Based on the above-mentioned light shield structure, in a further embodiment, the second light shield 20 can be set as an encapsulation housing 1 (not shown in the figure). The encapsulation housing 1 is used to encapsulate the circuit board of the sensor body 8. The encapsulation housing 1 has a connection port to facilitate the connection of the optoelectronic transceiver assembly 9. The encapsulation housing 1 can isolate the two optoelectronic transceiver assemblies 9 from each other. With the above-mentioned light shield structure, it can ensure that there is no mutual interference between the two sets of optoelectronic transceiver assemblies 9.

[0055] The above embodiments introduce two different light-blocking component structures. It is worth noting that the above embodiments are all based on two optical path channels 4 and two optoelectronic transceiver components 9. In actual use scenarios, when encountering more than two optoelectronic transceiver components 9, the corresponding light-blocking component structure can be adaptively adjusted. This embodiment will not elaborate on this.

[0056] In this embodiment of the invention, the optical path channel 4 serves two purposes: firstly, it stabilizes the optical path and isolates external light, ensuring that the light received by the optical receiver is reflected from the smoke gas after being emitted by the optical emitter, thus preventing inaccurate detection of oil fume concentration caused by light from other directions or paths being received by the optical receiver; secondly, it protects the light-transmitting element 6 and the photoelectric transceiver assembly 9. Specifically, the optical path channel 4 connected to the housing 1 is relatively long, with the ratio of the optical path channel 4 to the horizontal length of the housing 1 being greater than or equal to 0.5. Based on this design, smoke gas is less likely to enter the optical path channel 4, thereby reducing the probability of the light-transmitting element 6 coming into contact with the smoke gas. This reduces the possibility of particulate matter adhering to the light-transmitting element 6 or oil droplets condensing on it, helping to solve the problem of inaccurate oil fume concentration detection caused by contamination of the light-transmitting element 6.

[0057] In some embodiments, the optical path channel 4 can adopt a structural design with a larger near-field diameter and a smaller far-field diameter, which can further reduce the possibility of smoke gas entering the optical path channel 4. Please refer to... Figures 1-4 The cross-sectional area of ​​the end of the optical path channel 4 closest to the housing 1 is larger than the cross-sectional area of ​​the end of the optical path channel 4 furthest from the housing 1. Based on the above structure, the optical path channel 4 is a variable channel with a larger near end and a smaller far end. In the absence of lateral airflow, it is difficult for oily fumes to directly enter the optical path channel 4. Since the actual flow direction of oily fumes is from bottom to top, the amount of oily fumes flowing laterally is very small. Therefore, the probability of oily fumes entering the optical path channel 4 is further reduced, which can reduce the possibility of oily fumes entering the optical path channel 4 and contaminating the light-transmitting element 6, ensuring that the oily fume sensor can work effectively for a long time.

[0058] It is worth noting that the above embodiments do not limit the changing trend of the optical path channel 4. That is, as the distance between the optical path channel 4 and the housing 1 increases, the cross-sectional area of ​​the optical path channel 4 can shrink uniformly or non-uniformly. For example, the farther the optical path channel 4 is from the housing 1, the faster its cross-sectional area shrinks. In some cases, the optical path channel 4 can also adopt a two-section structure design; please refer to... Figures 2-5 The optical path channel 4 includes a curved segment and a straight segment. The cross-sectional area of ​​the curved segment decreases as the distance from the housing 1 increases, while the cross-sectional area of ​​the straight segment remains unchanged. Furthermore, the cross-sectional area of ​​the straight segment is consistent with the minimum cross-sectional area of ​​the curved segment.

[0059] In this embodiment of the utility model, the fume sensor does not limit the opening angle of the optical path channel 4 when detecting the fume concentration in the air duct above the two burners. That is to say, the optical path channel 4 can be horizontal, or it can be non-horizontal, such as slightly above or slightly below the horizontal.

[0060] In some embodiments, please refer to Figures 1-4 The opening of the optical path channel 4 is oriented slightly downwards and horizontally. Specifically, the angle between the opening of the optical path channel 4 and the horizontal line is less than or equal to 45°, and preferably, the angle is less than or equal to 15°. In practical applications, the oil fumes generated by the stove on the burner are affected by the negative pressure generated by the range hood and rise upwards. The downward-sloping design of the optical path channel 4 blocks the upward-sloping oil fumes from entering the optical path channel 4, effectively reducing the amount of oil fumes entering the optical path channel 4. In addition, even if some oil fumes enter the optical path channel 4, the downward-sloping design of the optical path channel 4 also helps the oil fume condensate to flow out, thereby ensuring the long-term effective operation of the oil fume sensor and enhancing the stability of the sensor.

[0061] In some specific embodiments, the inner wall of the optical path channel 4 is provided with components that facilitate the condensation of oil fumes, such as glass, metal sheets, or metal mesh. To avoid interfering with the light, the aforementioned condensation components, such as glass, metal sheets, or metal mesh, can be made with a matte finish, such as being painted black. In addition, the aforementioned condensation components, such as glass, metal sheets, or metal mesh, should be located as close as possible to the outlet of the optical path channel 4 to facilitate the rapid condensation of oil droplets and their early discharge.

[0062] In a further embodiment, to facilitate the outflow of condensate from the oil fumes and reduce obstruction of rising oil fume gases, please refer to... Figures 2-4The optical path channel 4 can be designed as a near-cylindrical shape. When the rising oil fume gas comes into contact with the optical path channel 4, it will be guided by the arc part, while the inner bottom of the optical path channel 4 forms a concave channel. Under the action of gravity, the oil fume condensate inside will flow out of the optical path channel 4 along the concave channel, which helps to extend the service life of the oil fume sensor and reduce the frequency of cleaning, replacement and maintenance of the sensor.

[0063] Based on the downward-sloping design of optical path channel 4, further details can be found in the following references. Figure 1 The distance between the bottom of the opening of the optical path channel 4 and the housing 1 is greater than or equal to the distance between the top of the opening of the optical path channel 4 and the housing 1. In other words, the opening of the optical path channel 4 can be designed at an angle. This downward angled design, combined with the angled opening, helps to block oily fumes drifting upwards, reducing the likelihood of fumes entering the optical path channel 4. Specifically, the horizontal length of the lower sidewall of the optical path channel 4 is greater than the horizontal length of the upper sidewall. Oily fumes drifting upwards are first blocked by the lower sidewall. The angled opening of the optical path channel 4 helps to create a difference in airflow velocity, making the airflow velocity above the opening lower than the airflow velocity below the opening, allowing the oily fumes to be pushed outwards and preventing them from directly entering the optical path channel 4.

[0064] In some embodiments, the optical path channel 4 is detachably connected to the housing 1. Based on the above solution, the detachable design of the optical path channel 4 allows for direct disassembly and cleaning or replacement of the optical path channel 4 after it becomes contaminated, which helps reduce usage costs.

[0065] In a further embodiment, the fume sensor is also equipped with an oil receiving tray (not shown in the figure), located below the housing 1. The oil receiving tray is used to collect the condensate from the oil droplets flowing out of the two optical path channels 4, and the oil receiving tray is detachably connected to the housing 1. In some possible embodiments, the oil receiving tray is equipped with a detection device and a feedback device. The detection device is used to detect the amount of oil accumulated in the oil receiving tray, and the detection device can be a probe. The feedback device is used to issue a feedback alarm, such as a buzzer alarm, after a certain amount of oil has accumulated in the oil receiving tray. Based on the detection device and the feedback device, quantitative feedback can be achieved to remind the user to clean the oil receiving tray and the optical path channels 4 in a timely manner.

[0066] According to some embodiments of this utility model, a range hood is provided, including a turbine fan and a fume sensor according to any of the above embodiments. Please refer to... Figure 5 The turbine fan includes a volute, and the oil fume sensor is installed on the front wall of the volute and is located in the middle of the air duct.

[0067] In a further embodiment, the range hood equipped with the aforementioned fume sensor has an intelligent fume analysis module. This intelligent control module includes a controller, a fume data receiving module, a fume data analysis module, and a feedback control module. The fume data receiving module is connected to the fume sensor to receive the fume concentration detection results from the fume sensor. The fume data analysis module is connected to the fume data receiving module to obtain the corresponding fume concentration detection results and determines the precise fume concentration above the two burners based on its built-in algorithm. The feedback control module can be connected to the turbine fan of the range hood to adjust the turbine fan speed according to the fume concentration above the two burners. The feedback control module can also be connected to an Internet of Things (IoT) module to send the corresponding fume concentration analysis results to the terminal device or platform connected to the range hood.

[0068] In other embodiments, the range hood equipped with the aforementioned fume sensor also has an intelligent voice control module. The intelligent voice control module includes a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the fume sensor to perform corresponding operations, thereby realizing intelligent control of the fume sensor and improving the user experience of using the range hood.

[0069] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An oil fume sensor, characterized in that, The fume sensor includes a housing and a sensor body installed inside the housing; The two sides of the housing are respectively connected to light path channels with openings. Light-transmitting elements are installed in the light path channels, and the light-transmitting elements and the housing form a closed accommodating space. The sensor body is installed in the accommodating space. The sensor body includes two optoelectronic transceiver components. Each optoelectronic transceiver component includes a light emitting device and a light receiving device. The two optoelectronic transceiver components are respectively oriented towards the light-transmitting elements in the two optical path channels.

2. The oil fume sensor according to claim 1, characterized in that, The housing is provided with a first light-blocking component, which is used to isolate the light emitting device and the light receiving device.

3. The oil fume sensor according to claim 1, characterized in that, The housing is provided with a second light-blocking component, which is used to isolate the two optoelectronic transceiver components.

4. The oil fume sensor according to claim 1, characterized in that, The cross-sectional area of ​​the end of the optical path channel closer to the housing is greater than the cross-sectional area of ​​the end of the optical path channel farther from the housing.

5. The oil fume sensor according to claim 4, characterized in that, The opening of the optical path channel is oriented horizontally downwards.

6. The oil fume sensor according to claim 5, characterized in that, The distance between the bottom of the opening of the optical path channel and the housing is greater than or equal to the distance between the top of the opening of the optical path channel and the housing.

7. The oil fume sensor according to any one of claims 1-6, characterized in that, The optical path channel is detachably connected to the housing.

8. The oil fume sensor according to claim 1, characterized in that, The light-transmitting element includes a collimating lens and a condensing lens, with the light emitting device aligned with the collimating lens and the light receiving device aligned with the condensing lens.

9. The oil fume sensor according to claim 1, characterized in that, The sensor body includes a circuit board, which is electrically connected to the two optoelectronic transceiver components. The circuit board integrates a drive circuit, a signal processing circuit, and a processor. The circuit board is connected to a terminal block via a wire, and the terminal block is used to connect to the controller of the range hood.

10. A range hood, characterized in that, The invention includes a turbine fan and an oil fume sensor according to any one of claims 1-9, wherein the turbine fan includes a volute, the oil fume sensor is mounted on the front wall of the volute, and the oil fume sensor is located in the middle of the air duct.

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