An oil fume purifier

Abstract

The present invention discloses an oil fume machine, which includes: a smoke collecting cavity (1), on which a biosensor (2) fixedly installed through a fixing bracket (3) is provided, and the biosensor (2) detects the components of harmful substances and their concentrations in the oil fume discharged from the smoke collecting cavity (1). Through the above arrangement, the sensor is fixed in the cavity of the smoke collecting cavity in a more stable manner, achieving the effect of protecting the sensor while ensuring the sensitivity of the sensor to the oil fume to the greatest extent, and further ensuring the integrity of the smoke collecting cavity and the overall aesthetics of the oil fume machine.

Description

Technical Field

[0001] The present invention belongs to the field of range hoods, and more specifically, relates to a cross-border range hood equipped with a biosensor for detecting harmful substances in oil fume. Background Art

[0002] Currently, in the prior art, when the above-mentioned range hood is working, the installation position and fixing method of the range hood sensor do not play a role in saving space, the integrity of the smoke collecting cavity is damaged, and the aesthetics of the range hood is greatly reduced; the sensor installation in the prior art also affects the sensitivity of the sensor to oil fume and its internal harmful substances, reducing it, making it insufficient to detect the oil fume in the oil fume overflow area in a timely manner; at the same time, there is not enough protection for the sensor. Generally, when wiping the inside of the smoke collecting cavity, it is easy to scratch the sensor that has not received sufficient protection, resulting in the sensor being easily damaged and thus affecting the normal operation of the sensor.

[0003] In view of this, the present invention is specifically proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a range hood that realizes the reasonable installation of a biosensor on the range hood, so that the installation and fixing method can, without affecting the aesthetics, detect the harmful substances and their concentrations in the oil fume to the greatest extent, and then accurately alarm and adjust the air volume.

[0005] To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is:

[0006] A range hood includes: a smoke collecting cavity, on which a biosensor is fixedly installed via a fixing bracket, and the biosensor detects the components of harmful substances and their concentrations in the oil fume discharged from the smoke collecting cavity.

[0007] Further, the fixing bracket is in a plate shape, and one side surface of the plate-shaped fixing bracket is in close contact with the biosensor; the fixing bracket is provided with a bracket connection hole for connecting the biosensor; the bracket connection hole is a long hole that penetrates the fixing bracket and allows a bolt to be threadedly engaged and move relatively.

[0008] Further, the outer periphery of the plate-shaped fixing bracket is provided with a protruding portion that protrudes radially outward, and the bracket connection hole is provided on the protruding portion; at both ends of one side of the surface where the fixing bracket is in contact with the biosensor, a protruding portion is respectively provided, and a bracket connection hole is provided on each of the two protruding portions.

[0009] Further, the biosensor is detachably clamped on a groove-shaped housing, the bottom surface of the groove-shaped housing is in close contact with one side surface of the fixing bracket, and is connected by a bolt passing through the bracket connection hole.

[0010] Further, the smoke collecting cavity includes a smoke channel opening, the lower end of the smoke channel opening is the inlet, and a mounting cavity is provided around the outer periphery of the lower end opening of the smoke channel opening; a detection hole is provided through the bottom wall of the mounting cavity, and the biosensor is arranged in the mounting cavity through a fixing bracket and opposite to the detection hole.

[0011] Further, the detection hole is arranged at the left end or the right end of the front side of the smoke collecting cavity.

[0012] Further, the upper side of the fixing bracket is in close contact with the biosensor, and the lower side is in close contact with the bottom wall of the mounting cavity; cavity buckles are respectively provided at the left and right ends of the fixing bracket and bent and extended in the opposite direction of the biosensor, and the cavity buckles are correspondingly clamped with the bayonets on the bottom wall of the mounting cavity.

[0013] Further, the biosensor is provided with a detection end for detecting oil fume, and the detection end is equipped with a probe for detecting oil fume. The sensor probe is composed of a molecular recognition part and a conversion part; the sensor probe is arranged coaxially opposite to the detection hole.

[0014] Further, a radially protruding extension is provided in the middle of one side of the fixing bracket, and a bracket hole is provided on the extension. The bracket hole is located between two bracket connection holes; the bracket hole is arranged coaxially opposite to the sensor probe.

[0015] Further, the end of the protruding part of the fixing bracket is bent towards the biosensor side to form a folded edge, and the folded edge is in close contact with one side wall of the mounting cavity of the smoke collecting cavity.

[0016] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0017] Through the above settings, the biosensor is connected and combined with the fixing bracket through the buckle, and is thus installed and fixed in the cavity of the smoke collecting cavity of the range hood, and the biosensor is fixed in the cavity of the smoke collecting cavity in a more stable manner; except that the probe at the detection end of the biosensor completely overlaps with the detection hole at the bottom surface frame platform of the smoke collecting cavity, the rest are hidden in the cavity of the smoke collecting cavity without exposure, achieving the protection of the appearance and function of the biosensor on the premise of maximizing the sensitivity of the biosensor to oil fume and feeding back relevant information in time, preventing the biosensor from being scratched or damaged during the cleaning of the smoke collecting cavity, and further ensuring the integrity of the smoke collecting cavity and the overall beauty of the range hood.

[0018] The following further describes in detail the specific embodiments of the present invention with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not unduly limit the present invention. Obviously, the accompanying drawings in the following description are only some embodiments, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts. In the drawings:

[0020] Figure 1 is a schematic diagram of the smoke collecting cavity structure in an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the structure of the biosensor in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the structure of the fixing bracket in an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the installation of the biosensor and the fixing bracket in an embodiment of the present invention;

[0024] Figure 5 is a top view of the smoke collecting cavity structure in an embodiment of the present invention;

[0025] Figure 6 is a schematic diagram of the structure of the biosensor probe in an embodiment of the present invention;

[0026] Figure 7 is a schematic diagram of the installation of the fixing bracket and the smoke collecting cavity in an embodiment of the present invention.

[0027] In the figures: 1 - smoke collecting cavity, 10 - installation cavity, 11 - control panel empty space, 12 - fixing empty space, 13 - oil fume passage opening, 131 - mounting plate, 132 - screw hole, 14 - bottom frame, 141 - air duct, 142 - detection hole, 15 - connecting plate, 151 - lighting empty space, 16 - top frame, 17 - cavity connection buckle, 2 - biosensor, 21 - detection end, 211 - probe, 210 - molecular recognition part, 212 - conversion part, 22 - wiring end, 231 - bracket buckle, 232 - sliding bracket buckle, 3 - fixing bracket, 31 - bracket connection hole, 32 - cavity buckle, 33 - protruding part, 34 - extending part, 35 - folding edge, 40 - housing, 41 - sensor hole, 42 - bracket hole.

[0028] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0030] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figures 1 to 4 As shown, an embodiment of the present invention introduces a range hood, which includes a smoke collecting chamber 1 and a biosensor 2 installed in the smoke collecting chamber 1; the smoke collecting chamber 1 is provided with a control panel space 11 for installing a control panel, a space for installing the biosensor 2 and a fixed space 12 for fixing a glass panel, and a smoke passage opening 13 is provided at the bottom thereof; the biosensor 2 is used to identify certain harmful substances in the smoke; the biosensor 2 is installed in the smoke collecting chamber 1 through a fixing bracket 3, and the fixing bracket 3 is connected to the biosensor 2 via a buckle provided thereon.

[0033] like Figure 1 As shown, in this embodiment, the smoke collecting chamber 1 is a cavity composed of a bottom frame and a top frame connected and provided with multiple vacancies, and the bottom frame 14 and the top frame 16 are both provided with openings; the opening of the bottom frame 14 is an oil smoke passage opening 13; and the oil smoke passage opening 13 is square. The oil smoke passage opening 13 is provided with mounting plates 131 all around, and each mounting plate 131 is provided with two rows of corresponding screw holes 132, one of which is used to install and fix the oil filter net, and the oil filter net is used to prevent large objects from being sucked into the range hood, and can also prevent human hair from being rolled into the range hood, and the other row of screw holes 132 is used to connect the smoke collecting chamber 1 with the range hood device.

[0034] like Figure 1As shown in the figure, in this embodiment, the inner edge of the bottom frame 14 is connected to the oil fume passage opening 13 through the connecting plates 15, so that a stepped structure recessed inward is formed at the lower part of the smoke collecting cavity 1. The four peripheral edges of the oil fume passage opening 13 are in a platform shape, and six air ducts 141 arranged in a row are provided thereon for ventilation. A detection hole 142 is provided at the left end or the right end of the platform side of the bottom frame 14, and its size corresponds to the size of the molecular recognition part 210 of the biosensor probe. The detection hole 142 is directly opposite to the position where the biosensor 2 probe 211 is located, providing a channel for the biosensor 2 to receive the oil fume. A lighting vacancy 151 is provided on the front connecting plate 15 that connects the front end of the bottom frame 14 and the oil fume passage opening 13 of the bottom frame 14 of the smoke collecting cavity 1. The lighting vacancy 151 is used to install the lighting device of the range hood.

[0035] As Figure 1 shown in the figure, in this embodiment, a control panel vacancy 11 for installing the control panel is provided on the front surface of the smoke collecting cavity 1. It is located in the central part of the smoke collecting cavity 1 on the side perpendicular to the platform of the bottom frame 14, and at the same time, it is on the same side of the oil fume passage as the lighting vacancy 151 for installing the lighting device, so that the lighting device can be directly connected to the control part of the control panel without going around or over the range hood device, improving the safety of the internal wiring of the smoke collecting cavity 1. Symmetric fixing vacancies 12 for fixing the glass panel are respectively provided on the left and right sides of the control panel vacancy 11 away from the control panel. The two ends of the glass panel are embedded in the fixing vacancies 12 to protect the smoke collecting cavity 1 and one side of the control panel display screen.

[0036] As Figure 1 shown in the figure, in this embodiment, a space formed by a hem is provided on the outer periphery of the bottom of the smoke collecting cavity 1 and is located inside the bottom frame 14. The above space is the installation cavity 10. The biosensor 2 is arranged in the installation cavity 10. The biosensor 2 is located at the left end or the right end of its cavity space. Except for the biosensor 2 probe 211, other parts of the body of the biosensor 2 are wrapped inside the cavity of the smoke collecting cavity 1 and are not exposed. The biosensor 2 is installed in the smoke collecting cavity 1 through the biosensor fixing bracket 3. The biosensor 2 probe 211 faces the detection hole 142 of the smoke collecting cavity 1 for the probe 211 to detect and distinguish the smell and harmful substances contained in the oil fume. The top frame 16 is connected to the opposite surface of the bottom frame of the smoke collecting cavity 1. The inner circle of the top frame 16 forms a cavity by buckling, and its opening is the smoke passage opening. A groove that can be buckled with other components is formed on the top frame 16.

[0037] As Figure 2As shown in the figure, in this embodiment, the biosensor 2 is a cuboid device. A connector with a hole for the biosensor 2 is installed at the exact center of the top end. On the left and right sides of the biosensor 2 are wiring terminals 22, which are connected to the control terminal receiver of the control panel and transmit the information detected by the biosensor 2 to the control panel for the control terminal to identify and then make corresponding responses. The biosensor 2 is detachably installed in a groove-shaped housing 40. There are three inwardly buckling buckles between the fitting surfaces of the groove-shaped housing 40 and the biosensor 2. Among them, there is a bracket buckle 231 at each of the left and right ends of the fitting surface between the groove-shaped housing 40 and the biosensor 2. The other one is a sliding bracket cavity buckle 232 in the middle. A probe 211 for detecting lampblack is installed at the central position of the biosensor 2, and the probe 211 is used to detect lampblack.

[0038] As Figure 6 shown in the figure, in this embodiment, the probe 211 on the detection end 21 of the biosensor 2 is composed of a molecular recognition part 210 and a conversion part 212. The molecular recognition part 210 is in the shape of a conical warhead and is used to detect the lampblack in contact. The conversion part 212 connected to the molecular recognition part 210 through a columnar connector is frustum-shaped and functions as a transducer. The two are connected and installed in the detection end 21 of the biosensor 2.

[0039] As Figure 2 shown in the figure, in this embodiment, the detection end 21 of the biosensor 2 can identify harmful substances and their concentrations in lampblack, and can identify the detected information. The identified information is transmitted to the control terminal of the control panel through the wiring terminal 22. The control terminal is used to control the working condition of the range hood. After analyzing the obtained information, the control terminal can automatically adjust the air volume of the range hood and give corresponding alarms to the operator.

[0040] As Figures 2 to 4 shown in the figure, in this embodiment, the biosensor 2 is installed inside the smoke collecting cavity 1 through connection with the fixed bracket 3. The side of the fixed bracket 3 without connection holes is a smooth plane and is fixed inside the smoke collecting cavity 1 with glass glue. On the left and right sides of the fitting surface between the fixed bracket 3 and the biosensor 2 on the fixed bracket 3 and at the left and right ends of the fitting surface between the fixed bracket 3 and the biosensor 2 on the biosensor 2, there are symmetric protruding parts. Bracket connection holes 31 are provided on the symmetric protruding parts. The size of the bracket buckle 231 corresponds to the size of the bracket connection holes 31. The central position part of the fitting surface between the fixed bracket 3 and the biosensor 2 on the fixed bracket 3 protrudes, and a bracket hole 42 is provided at the position corresponding to the position of the hole of the biosensor 2 on the protruding part.

[0041] As Figure 3As shown in the figure, in this embodiment, the fixed bracket 3 is connected to the biosensor 2 through the bracket connection hole 31 on the fixed bracket 3 and the bracket buckle 231. When the biosensor 2 is connected to the fixed bracket 3, the vacant position provides space for the detection end 21 of the biosensor 2. At the same time, the bracket connection hole 31 is buckled with the bracket buckle 231 so that the biosensor 2 and the fixed bracket 3 are connected together and installed in the internal space of the cavity corresponding to the detection hole 142 of the smoke collection cavity 1, and can be completely hidden in the cavity of the smoke collection cavity 1.

[0042] As Figures 1 to 7 shown in the figure, in this embodiment, the outer periphery of the plate-shaped fixed bracket 3 is provided with a protruding portion 33 extending radially outward, and the bracket connection hole 31 is provided on the protruding portion; two ends of one side of the fitting surface of the fixed bracket 3 and the biosensor 2 are respectively provided with a protruding portion 33, and a bracket connection hole 31 is respectively provided on the two protruding portions 33. The biosensor 2 is detachably clamped to a groove-shaped housing, the bottom surface of the groove-shaped housing is attached to one side surface of the fixed bracket 3, and is connected by a bolt passing through the bracket connection hole 31. A radially protruding extension portion 34 is provided in the middle of one side of the fixed bracket 3, and a bracket hole 42 is provided on the extension portion 34. The bracket hole 42 is located between the two bracket connection holes 31; the bracket hole 42 is coaxially opposite to the sensor probe 211.

[0043] As Figure 7 shown in the figure, in this embodiment, the two ends of the fixed bracket 3 where the bracket connection hole 31 is located are symmetric with each other, and cavity buckles 32 with symmetric positions and dimensions are provided on both sides thereof. The dimensions and positions of the cavity buckles 32 correspond to the dimensions and positions of the cavity connection buckles 17 provided inside the smoke collection cavity 1. The oil fume odor detection module composed of the connection of the fixed bracket 3 and the biosensor 2 realizes the connection between the biosensor 2 and the smoke collection cavity 1 through the connection of the cavity buckles 32 on the fixed bracket 3 and the cavity connection buckles 17.

[0044] As Figure 4 shown in the figure, in this embodiment, the biosensor 2 and the fixed bracket 3 are assembled and installed at the left end or the right end of the surface where the vacant position 11 of the control panel is located in the cavity of the smoke collection cavity 1. Among them, the position of the probe 211 of the detection end 21 of the biosensor 2 completely overlaps with the detection hole 142 of the bottom frame 14 of the smoke collection cavity 1, so that the biosensor 2 can detect the oil fume on the front side of the smoke collection cavity 1 without hindrance while being hidden in the cavity of the smoke collection cavity 1 to the greatest extent, greatly improving the sensitivity of the biosensor 2 to oil fume and the concentration of oil fume.

[0045] As Figure 1As shown, in this embodiment, in the smoke collecting cavity 1, on one side of the bottom surface frame 14 connected to the surface where the control panel vacancy 11 is located, there are six air ducts 141 arranged in a row longitudinally along this side. At the left or right end of the side of the bottom surface frame 14 connected to the surface where the control panel vacancy 11 is located, there is a detection hole 142. The part of the detection hole 142 corresponding to the interior of the smoke collecting cavity 1 is used to install the biosensor 2. In the middle part of the groove in the surface of the smoke collecting cavity 1 where the control panel vacancy 11 is located, a control panel for controlling the working process of the range hood is placed. The data end of the control panel is connected to the motor part, the lighting device and the biosensor 2 of the range hood, and receives and controls their information.

[0046] As Figures 1 to 4 shown, in this embodiment, at the left or right end of the groove cavity of the surface of the smoke collecting cavity 1 where the control panel vacancy 11 is located, and in the inner space of the cavity corresponding to the detection hole 142, it is used to install the biosensor 2 connected to the fixing bracket 3. At the left and right ends and the central position of the joint surface between the fixing bracket 3 and the biosensor 2 on the biosensor 2, there are inwardly buckled buckles. Among them, the bracket buckles 231 with dimensions corresponding to the bracket connection holes 31 on the fixing bracket 3 are located on the left and right sides of the joint surface between the fixing bracket 3 and the biosensor 2 on the biosensor 2. The biosensor 2 is connected and combined with the fixing bracket 3 through the connection of the bracket buckles 231 on it and the bracket connection holes 31 at the corresponding positions on the fixing bracket 3. The top of the biosensor 2 is provided with a sliding bracket buckle 232. The sliding bracket buckle 232 is provided with a sensor hole 41. The position of the sensor hole 41 corresponds to the position of the top of the fixing bracket 3, providing space for connecting the biosensor 2 and the fixing bracket 3 through a third connecting piece. The sliding bracket buckle 232 was originally located on the side of the top of the biosensor 2 opposite to the joint surface between the fixing bracket 3 and the biosensor 2. When the biosensor 2 is connected to the fixing bracket 3, the sliding bracket buckle 232 slides perpendicular to the joint surface between the fixing bracket 3 and the biosensor 2 of the biosensor 2, so that the sliding bracket buckle 232 fixes the already connected fixing bracket 3 and biosensor 2 again, and at the same time makes the sensor hole 41 of the sliding support buckle 232 coincide with the bracket hole 42, thereby providing corresponding space for their connection. The smooth plane of the fixing bracket 3 is connected to the part of the front groove cavity of the smoke collecting cavity 1 by glass glue, so that the biosensor 2 and the fixing bracket 3 can be more firmly installed in the smoke collecting cavity 1.

[0047] In this embodiment, the detection end 21 of the biosensor 2 is installed at the central position of the joint surface between the fixed bracket 3 and the biosensor 2 on the biosensor 2. It is provided with a probe 211. After the biosensor 2 is installed in the smoke collection cavity 1 through combination with the fixed bracket 3, the probe 211 completely overlaps with the detection hole 142 at the step of the smoke collection cavity 1. When the range hood is working, in this installation mode, the oil fume at the detection hole 142 is directly recognized by the probe 211 of the biosensor 2 through the detection hole 142, enabling the biosensor 2 to detect in a timely manner and with the maximum possible accuracy whether there are harmful substances in the oil fume and their concentrations.

[0048] In this embodiment, connection terminals 22 are arranged on the left and right sides of the biosensor 2. The connection terminals 22 are connected to the control end of the control panel. When the biosensor 2 detects harmful substances, the signal transmitted by the biosensor 2 to the control panel causes the range hood device to issue an alarm in a timely manner. At the same time, after the biosensor 2 identifies the concentration of harmful substances in the oil fume, it transmits the corresponding signal to the control panel, and the control panel controls the wind speed when the range hood is working, automatically and efficiently reducing the harm of the oil fume to the human body.

[0049] In this embodiment, the rest of the biosensor 2 is completely hidden in the cavity of the smoke collection cavity 1, achieving the protection of the biosensor 2 without affecting the molecular recognition part 210 in the probe 211 of the biosensor 2 for detecting oil fume and its detection sensitivity, and without affecting the integrity of the smoke collection cavity 1, so as to avoid scratching the biosensor 2 when wiping the inner wall of the smoke collection cavity 1 and causing functional damage to the biosensor 2.

[0050] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above into equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. An oil fume machine, comprising: A smoke collecting cavity (1), characterized in that a biosensor (2) fixedly installed via a fixing bracket (3) is provided on the smoke collecting cavity (1), and the biosensor (2) detects the components of harmful substances and their concentrations in the oil fume discharged from the smoke collecting cavity (1). The smoke collecting cavity (1) is a cavity formed by connecting a bottom frame and a top frame and having multiple vacancies; the inner edge of the bottom frame (14) is connected to the oil fume passage opening (13) through respective connecting plates (15), so that a stepped structure recessed inward is formed in the lower part of the smoke collecting cavity (1), the four peripheral edges of the oil fume passage opening (13) are in a platform shape, and six air ducts (141) arranged in a row are provided thereon for ventilation. The smoke collecting cavity (1) includes an oil fume passage opening (13), the lower end of the oil fume passage opening (13) is an inlet, and an installation cavity is provided around the outer periphery of the lower end opening of the oil fume passage opening (13); a detection hole (142) penetrating through is provided on the bottom wall of the installation cavity, and the biosensor (2) is arranged in the installation cavity (10) via the fixing bracket (3) at a position opposite to the detection hole (142).

2. The range hood according to claim 1, wherein: The fixing bracket (3) is in a plate shape, and one side surface of the plate-shaped fixing bracket (3) is in fitting contact with the biosensor (2); a bracket connection hole (31) for connecting the biosensor (2) is provided on the fixing bracket (3); the bracket connection hole (31) is a long hole penetrating through the fixing bracket (3) for the bolt to be threadedly engaged and relatively movable.

3. The range hood according to claim 2, characterized in that: An outwardly radially protruding extension part (33) is provided on the outer periphery of the plate-shaped fixing bracket (3), and the bracket connection hole (31) is provided on the extension part; an extension part (33) is respectively provided at both ends of one side of the fitting surface of the fixing bracket (3) and the biosensor (2), and a bracket connection hole (31) is respectively provided on the two extension parts (33).

4. The range hood according to claim 3, wherein: The biosensor (2) is detachably clamped to a groove-shaped housing, the bottom surface of the groove-shaped housing is in fitting contact with one side surface of the fixing bracket (3), and is connected by a bolt passing through the bracket connection hole (31).

5. A range hood according to any one of claims 1 to 4, characterized in that: The detection hole is provided at the left end or the right end of the front side of the smoke collecting cavity (1).

6. A range hood according to any one of claims 1 to 4, characterized in that: The upper side surface of the fixing bracket (3) is in fitting contact with the biosensor (2), and the lower side surface is in fitting contact with the bottom wall of the installation cavity (10); cavity buckles (32) respectively bent and extending in the opposite direction of the biosensor (2) are provided at the left and right ends of the fixing bracket (3), and the cavity buckles (32) are correspondingly clamped with the bayonets on the bottom wall of the installation cavity (10).

7. A range hood according to any one of claims 1 to 4, characterized in that: The biosensor (2) is provided with a detection end (21) for detecting oil fume, the detection end (21) is equipped with a probe (211) for detecting oil fume, and the sensor probe (211) is composed of a molecular recognition part (210) and a conversion part (212); the sensor probe (211) is coaxially and oppositely arranged with the detection hole (142).

8. The range hood according to claim 7, wherein: An extension part (34) radially protruding and extending is provided in the middle of one side of the fixing bracket (3), a bracket hole (42) is provided on the extension part (34), and the bracket hole (42) is located between the two bracket connection holes (31); the bracket hole (42) is coaxially and oppositely arranged with the sensor probe (211).

9. A range hood according to any one of claims 1 to 4, characterized in that: The end of the protruding portion (33) of the fixed bracket (3) is bent towards the biosensor (2) to form a hem (35), and the hem (35) is in contact with one side wall of the installation cavity (10) of the smoke collecting cavity (1).

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