Range hood

Abstract

The utility model discloses a range hood which comprises a centrifugal fan, the centrifugal fan comprises a volute and an impeller arranged in the volute, and the impeller comprises blades; the detection module comprises a transmitting module and a receiving module; the transmitting module is used for transmitting infrared light to the blades at the corresponding positions; the receiving module is used for receiving reflected light of the blades; and the processing assembly is electrically connected with the detection module and can judge the thickness of the oil film accumulated on the blade according to the light intensity of the receiving module. Compared with the prior art, the utility model has the advantages that the oil accumulated on the blades has large difference in absorptivity to infrared spectrums with specific wavelengths due to different thicknesses, so that the state and the thickness condition of a medium are judged by detecting the intensity of reflected light at a fixed position, and the smudginess condition of the impeller can be obtained; the detection accuracy of the pollution degree is improved, so that the oil pollution condition and the dynamic balance damage condition are accurately judged.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to an oil fume extractor. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics, using a fan system installed inside the range hood to absorb and exhaust oil fumes, and using a filter to filter out some grease particles.

[0003] After long-term use of the range hood, a large amount of oil and dust will accumulate inside the shell, especially the fan system will be seriously accumulated with oil and dust. For example, the Chinese patent application with application number 202310919004.9 discloses a range hood with a vertical fan arrangement. After the impeller stops running, one side is at the lowest point. The accumulated oil and dirt gather along the blade structure to the lowest position and then drip, so that the oil and dirt accumulated at the lowest position is more than other areas. This also means that the dynamic balance of the impeller is destroyed, and the whole machine will have problems such as shaking, and the user has to clean and maintain it (other arrangements have similar problems).

[0004] At present, most range hoods use the cumulative running time of the impeller to remind maintenance, but different users have different cooking habits, and the accumulation of oil on the impeller blades varies greatly. In Sichuan and Chongqing, the oil may accumulate seriously before the maintenance reminder time arrives, while in areas with light diets, there is no obvious pollution after several cycles. Therefore, the reminder method that relies solely on time accumulation has a high misjudgment rate. After the door-to-door cleaning or automatic cleaning, the user finds that there is no obvious dirt and feels that the judgment is uncontrollable, which is a poor experience. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a range hood to improve the accuracy of pollution degree detection in view of the deficiencies in the above-mentioned prior art.

[0006] The utility model solves the above technical problems by adopting the following technical solution: a range hood, comprising a centrifugal fan, the centrifugal fan comprising a volute and an impeller arranged in the volute, the impeller comprising blades; the characteristics are:

[0007] The range hood further comprises:

[0008] A detection module, the detection module comprising a transmitting module capable of transmitting infrared light to a blade at a corresponding position and a receiving module capable of receiving light reflected from the blade; and

[0009] The processing component is electrically connected to the detection module and can judge the thickness of the oil film accumulated on the blade according to the light intensity of the receiving module.

[0010] Since the oil accumulated on the blades has different thicknesses and has greatly different absorption rates for infrared spectra of specific wavelengths, the medium state and thickness can be judged by detecting the intensity of reflected light at a fixed position. This can help determine the dirtiness of the impeller, improve the accuracy of pollution detection, and further accurately determine the oil pollution and dynamic balance damage.

[0011] In order to facilitate the arrangement of the detection module, the detection module is arranged on the annular wall of the volute, and a hole is opened in the annular wall corresponding to the position of the detection module.

[0012] Since the blade body material such as galvanized sheet and the oil stains adhered to it have a large difference in specific heat capacity, this characteristic can be used to judge the difference in oil contamination at different locations based on the degree of temperature drop fluctuation at different locations, thereby improving the accuracy of detection and accurately judging the oil contamination situation and the destruction of dynamic balance.

[0013] Furthermore, the range hood also includes a cleaning device, which includes a water tank for storing cleaning medium, a heating or steam generating module for heating or vaporizing the cleaning medium in the water tank, and a spray arm for receiving the cleaning medium processed by the heating or steam generating module to clean the centrifugal fan.

[0014] Furthermore, the heating or steam generating module and the spray arm are fluidically connected via a first conduit, the spray arm is located between the wall of the volute and the impeller, and a nozzle is provided on the spray arm, thereby facilitating cleaning of the blades.

[0015] Furthermore, the spray arm is also provided with a brush head, thereby being able to brush off the softened oil stains on the blades.

[0016] Furthermore, the cleaning device also includes a driving mechanism for driving the spray arm to rotate in a direction parallel to the axis of the centrifugal fan, thereby facilitating the expansion of the cleaning range and allowing the spray arm to rotate when no cleaning is required to avoid accumulation of oil or blockage due to long-term presence in a passage with more oil smoke.

[0017] Furthermore, the range hood further comprises an electrical box, wherein the electrical box comprises a power board and a radiator for dissipating heat from the power board;

[0018] The cleaning device comprises a three-way valve with one inlet and two outlets, the water tank is connected to one of the inlets of the three-way valve through a second conduit, the heating or steam generation module is connected to one of the outlets of the three-way valve, and the second conduit passes through a radiator. Thus, the heat of the radiator can be used to preheat the cleaning medium, thereby reducing energy consumption and improving the heat dissipation effect of the radiator.

[0019] Furthermore, another outlet of the three-way valve is connected to the water tank through a third conduit, thereby facilitating the recovery of the cleaning medium.

[0020] Preferably, the radiator is of fin type, and the second conduit passes through each fin of the radiator in a curved manner, thereby improving heat exchange efficiency.

[0021] In order to facilitate the control of the supply of cleaning medium to the water tank, a water pump or a water valve is provided at the connection between the water tank and the second conduit.

[0022] Compared with the prior art, the advantages of the utility model are: since the oil accumulated on the blades has different thicknesses and has a large difference in the absorption rate of the infrared spectrum of a specific wavelength, the medium state and thickness can be judged by detecting the intensity of the reflected light at a fixed position, the dirtiness of the impeller can be obtained, the accuracy of the pollution degree detection can be improved, and the oil pollution situation and the destruction of dynamic balance can be accurately judged. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a range hood according to an embodiment of the utility model;

[0024] Figure 2 It is a cross-sectional view (left-right cross-section) of a range hood according to an embodiment of the utility model;

[0025] Figure 3 It is a cross-sectional view (front-to-back cross-section) of a range hood according to an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of a centrifugal fan of a range hood and a cleaning device thereof according to an embodiment of the utility model;

[0027] Figure 5 Schematic diagram of the centrifugal fan of the range hood and its cleaning device according to the embodiment of the utility model (with Figure 4 different perspectives);

[0028] Figure 6 A schematic diagram of a partial electrical box and a cleaning device of a range hood according to an embodiment of the utility model;

[0029] Figure 7-1 This is a schematic diagram of the detection principle of the detection module of the range hood according to the embodiment of the utility model (no pollution);

[0030] Figure 7-2 This is a relationship diagram between light intensity and impeller position of the range hood in the embodiment of the utility model when there is no pollution;

[0031] Figure 8-1 This is a schematic diagram of the detection principle of the detection module of the range hood according to an embodiment of the utility model (mild pollution);

[0032] Figure 8-2 This is a relationship diagram between light intensity and impeller position when the range hood of the utility model embodiment is lightly polluted;

[0033] Figure 9-1 This is a schematic diagram of the detection principle of the detection module of the range hood according to the embodiment of the utility model (severe pollution);

[0034] Figure 9-2 This is a relationship diagram between light intensity and impeller position when the range hood of the utility model embodiment is heavily polluted;

[0035] Fig.10 This is a control principle block diagram of the range hood according to an embodiment of the utility model. DETAILED DESCRIPTION

[0036] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present utility model can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] See also Figure 1 to Figure 6 A range hood includes a centrifugal fan 1. In this embodiment, the range hood is a top suction type. The centrifugal fan 1 is arranged in a fan frame 2. The range hood also includes a fume collecting hood 3 located under the fan frame 2. Alternatively, the range hood may be a side suction type, a low suction type, or other existing types of range hoods. The centrifugal fan 1 includes a volute 11, an impeller 12 arranged in the volute 11, and a motor 13 for driving the impeller 12 to rotate.

[0039] After the range hood is used for a long time, oil will accumulate on the blades 121 of the impeller 12, and the thickness of the oil on different blades 121 is usually different. Due to the different thicknesses of the oil accumulated on the blades 121, the absorption rate of the infrared spectrum of a specific wavelength is greatly different.

[0040] According to Lambert-Beer's law, the thicker the medium is, the more light energy it absorbs. When the total incident light energy remains unchanged, the transmission and reflection are weakened accordingly, and its absorbance is Where L is the thickness of the medium, c is the concentration of the substance, and K is the absorption coefficient (the absorption rate is related to the wavelength of light. For example, when the emitted light or filter is 914nm, the oil absorption rate is 0.215).

[0041] For the oil stains corresponding to the cooking parameters of the user's home, it can be generally considered that the main change is the medium thickness L, and the substance concentration is basically regarded as a constant. Therefore, the medium state and thickness can be judged by detecting the intensity of the reflected light at a fixed position, and the dirtiness of the impeller 12 can be obtained. The blade angle or position where the oil stains are seriously accumulated can also be judged, and the automatic cleaning device can be used for cleaning. Strong cleaning can be performed for the angle range where the oil stains are seriously accumulated, and then a more accurate prediction of whether cleaning and maintenance is needed and whether it is clean can be given, reducing the user's distrust and improving the cleaning experience and intelligence.

[0042] To this end, the range hood further includes a detection module 4, which is disposed on the annular wall 111 of the volute 11, in this embodiment, on the annular wall 111 of the volute 11, such as the outer side of the annular wall 111, and a hole can be opened at the position where the detection module 4 is disposed on the volute 11, so that the detection module 4 can emit light to the impeller 12 and receive light reflected by the impeller 12. The detection module 4 includes a transmitting module 41 that can emit infrared light and a receiving module 42 that can receive infrared light. When the impeller 12 is stationary, the detection module 4 can emit infrared light to the blade 121 at the corresponding position, and receive light reflected by the blade 121.

[0043] See also Figure 7-1 , is the state of the blade 121 and the light receiving and light path after cleaning or unused, when there is basically no pollution, wherein X is the axis of the centrifugal fan 1, see Figure 7-2 , shows the relationship between the received light intensity and the position / angle of different blades 121. At this time, the received light intensity is equal throughout the entire circumference of the impeller 12. Figure 8-1 , which is a lightly polluted state, the overall thickness of the oil film 100 is relatively thin, see Figure 8-2 , which shows the relationship between the received light intensity and the position / angle of different blades 121. At this time, the distribution on the entire circumference of the impeller 12 begins to be uneven, and the light intensity decreases to a certain extent as the oil film thickness increases.

[0044] See also Figure 9-1, after a long period of use by the user, and after multiple rounds of shutdown and rest (so that the lowest position of the impeller has obvious oil accumulation, while the highest position is thin). At position A where the oil film 100 accumulates thinly, less light is absorbed and more light is reflected, such as the blades near the highest position of the impeller 12 after shutdown. At position B where the oil film 100 accumulates thickly, more light is absorbed and less light is reflected, such as the blades near the lowest position of the impeller 12 after shutdown.

[0045] Therefore, it is possible to judge whether the impeller blade surface has accumulated obvious oil stains based on the fluctuations at different positions (this also means that the dynamic balance of the impeller is destroyed, and the whole machine will have problems such as shaking).

[0046] There are two ways to detect:

[0047] 1. Use the average value of the light intensity after one or several turns to judge the degree of dirtiness;

[0048] 2. The degree of dirtiness can be judged by counting the intensity of light intensity fluctuations after one or several turns (such as the difference between the maximum and minimum values).

[0049] The range hood also includes a cleaning device for cleaning the centrifugal fan 1, see Figure 2 to Figure 6 The cleaning device includes a water tank 51 for storing a cleaning medium, the cleaning medium may be water or a cleaning agent, and the water tank 51 may be connected to tap water or other containers. The cleaning device also includes a heating or steam generating module 52, a water pump or a water valve 53, a three-way valve 54, a first conduit 551, a second conduit 552, a third conduit 553, a spray arm 56, and a driving mechanism 57.

[0050] The first conduit 551 is connected between the heating or steam generating module 52 and the spray arm 56 so that the two are fluidically connected. The spray arm 56 extends in the volute 11 of the centrifugal fan 1, and is located between the wall of the volute 11 and the impeller 12, and preferably extends in a direction parallel to the axial direction of the centrifugal fan 1. The spray arm 56 is provided with a nozzle 561, and the nozzle 561 can be used to spray the heated cleaning medium or the steam-state cleaning medium onto the blades 121 of the impeller 12 (it can also be partially sprayed onto the volute 11). The spray arm 56 can also be provided with a brush head 562, and the brush head 562 can be used to brush off the oil stains on the blades 121. The driving mechanism 57 is arranged on the outside of the volute 11, and is used to drive the spray arm 56 to rotate around its own axis (along the direction parallel to the axial direction of the centrifugal fan 1), and can be any existing rotation drive module, such as a motor. Therefore, the direction of the nozzle 561 and / or the brush head 562 can be changed by driving the spray arm 56 to rotate, thereby achieving comprehensive cleaning, or when cleaning is not needed, the nozzle 561 and / or the brush head 562 can be rotated to face the wall of the volute 11 to reduce the risk of oil blockage and oil accumulation.

[0051] The range hood further includes an electrical box 6, which includes a power board 61 and a radiator 62 for dissipating heat from the power board 61, and the radiator 62 may be in the form of heat dissipation fins. The three-way valve 54 is a valve body with one inlet and two outlets. The water tank 51 is connected to one of the inlets of the three-way valve 54 through a second conduit 552 by a water pump or a water valve 53 (the water pump or the water valve 53 is arranged at the connection between the water tank 51 and the second conduit 552 to control whether the cleaning medium is supplied), and one of the outlets of the three-way valve 54 is connected to the heating or steam generation module 52, and the other outlet is connected to the water tank 51 through a third conduit 553. The second conduit 552 can be bent to pass through the heat dissipation fins of the radiator 62, so that the cleaning medium in the water tank 51 enters the second conduit 552 through the water pump or the water valve 53, and the cleaning medium in the second conduit 552 exchanges heat with the radiator 62. After being preheated, the cleaning medium enters the three-way valve 54, enters the heating or steam generation module 52 to be heated or vaporized, and then sprays and cleans through the nozzle 561 on the spray arm 56. Unused cleaning medium can enter the third pipe 553 after passing through the three-way valve 54, and then returns to the water tank 51.

[0052] See also Fig.10 The range hood of the embodiment of the utility model further includes a processing component 7, which has a processor. The motor 13 of the centrifugal fan 1, the heating or steam generating module 52 of the cleaning device, the water pump or water valve 53, the driving mechanism 57, and the detection module 4 are all electrically connected to the processing component 7. In addition, the processing component 7 can also be electrically connected to a switch module 71, a storage module 72 and a lamp module 73, and the switch module 71 and the lamp module 73 are the same as the prior art. The processing component 7 can control the light emission of the transmitting module 41 of the detection module 4, and judge the thickness of the oil film 100 accumulated on the blade 121 according to the light intensity received by the receiving module 42. Here, the processing component 7 judges the thickness of the oil film 100, which means that the corresponding relationship between the light intensity and the thickness of the oil film 100 can be stored in the storage module 72 through multiple experiments. In actual use, when the light intensity is detected, the processing component 7 reads the data stored in the storage module 72 to find the corresponding thickness of the oil film 100. It can also be calculated in real time according to the Lambert Beer law.

[0053] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising a centrifugal fan (1), the centrifugal fan (1) comprising a volute (11) and an impeller (12) arranged in the volute (11), the impeller (12) comprising blades (121); characterized in that: The range hood further comprises: A detection module (4) comprising a transmitting module (41) capable of transmitting infrared light to a blade (121) at a corresponding position and a receiving module (42) for receiving light reflected by the blade (121); and A processing component (7) is electrically connected to the detection module (4) and is capable of judging the thickness of the oil film (100) accumulated on the blade (121) according to the light intensity of the receiving module (42); The range hood further comprises a cleaning device, comprising a water tank (51) for storing a cleaning medium, a heating or steam generating module (52) for heating or vaporizing the cleaning medium in the water tank (51), and a spray arm (56) for receiving the cleaning medium processed by the heating or steam generating module (52) to clean the centrifugal fan (1).

2. The range hood according to claim 1, characterized in that: The detection module (4) is arranged on the annular wall (111) of the volute (11), and the annular wall (111) has a hole corresponding to the position of the detection module (4).

3. The range hood according to claim 1 or 2, characterized in that: The heating or steam generating module (52) and the spray arm (56) are connected by a first conduit (551) to be fluidically connected. The spray arm (56) is located between the wall surface of the volute (11) and the impeller (12). A nozzle (561) is provided on the spray arm (56).

4. The range hood according to claim 3, characterized in that: The spray arm (56) is also provided with a brush head (562).

5. The range hood according to claim 3, characterized in that: The cleaning device further comprises a driving mechanism (57) for driving the spray arm (56) to rotate in a direction parallel to the axial direction of the centrifugal fan (1).

6. The range hood according to claim 1 or 2, characterized in that: The range hood further comprises an electrical box (6), wherein the electrical box (6) comprises a power board (61) and a radiator (62) for dissipating heat from the power board (61); The cleaning device comprises a three-way valve (54) with one inlet and two outlets, the water tank (51) is connected to one of the inlets of the three-way valve (54) through a second conduit (552), the heating or steam generating module (52) is connected to one of the outlets of the three-way valve (54), and the second conduit (552) passes through a radiator (62).

7. The range hood according to claim 6, characterized in that: The other outlet of the three-way valve (54) is connected to the water tank (51) through a third conduit (553).

8. The range hood according to claim 6, characterized in that: The radiator (62) is of fin type, and the second pipe (552) passes through each fin of the radiator (62) in a curved manner.

9. The range hood according to claim 6, characterized in that: A water pump or a water valve (53) is provided at the connection between the water tank (51) and the second conduit (552).

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