Range hood

Abstract

The present application belongs to the technical field of kitchen appliances, and particularly relates to an extractor hood. The present application aims to solve the problem that a detection element cannot accurately detect the condition of oil fume. The extractor hood of the present application comprises an outer cylinder and an inner cylinder arranged in the outer cylinder, and the inner cylinder is provided with a detection element; a first gap is arranged on the inner cylinder and is oppositely arranged with the inner side wall of the outer cylinder so that oil fume is attached to the outer cylinder and the inner cylinder. The extractor hood of the present application has a large gap between the inner cylinder and the outer cylinder at the position of the first gap, which facilitates the contact of oil fume with the outer cylinder and the inner cylinder, and enables the oil fume to be effectively attached to the inner cylinder and the outer cylinder, thereby effectively avoiding the attachment of oil fume to the detection element. The detection element can effectively and reliably detect whether there is oil fume in the air and the size of the oil fume concentration in the air, so as to facilitate the timely understanding of the condition of oil fume in the air and the adjustment of the gear of the extractor hood according to the condition of oil fume.

Description

Technical Field

[0001] This invention belongs to the field of kitchen appliance technology, specifically relating to a range hood. Background Technology

[0002] A range hood, also known as a cooking hood, is a kitchen appliance used to purify the kitchen environment. It is typically installed above the stovetop and quickly removes waste and harmful fumes generated during cooking, venting them outdoors.

[0003] A range hood typically includes a casing, an inner duct shell, a fan impeller that works in conjunction with the duct shell, and a smoke collection hood located at the bottom of the fan impeller. When the fan impeller is working, it draws the cooking fumes collected by the smoke collection hood into the duct shell, and then exhausts them outdoors, thus purifying the kitchen environment. In addition, a range hood includes a detection element and a controller. The detection element detects the concentration of cooking fumes and moisture, while the controller controls the fan impeller's start / stop and rotation speed based on the detection results.

[0004] However, the detection element is usually exposed to the air. When the detection element is exposed to the oil fume environment for a long time, the oil fume will clog the detection element, making it impossible for the detection element to accurately detect whether there is oil fume in the air and the concentration of oil fume in the air. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, namely the inability of the detection element to accurately detect the state of cooking fumes, this invention provides a range hood comprising an outer cylinder and an inner cylinder disposed within the outer cylinder, wherein a detection element is disposed in the inner cylinder; a first notch is provided on the inner cylinder, the first notch being disposed opposite to the inner sidewall of the outer cylinder, so that cooking fumes adhere to the outer cylinder and the inner cylinder.

[0006] In the preferred technical solution of the above-mentioned range hood, a first rib is provided on the inner wall of the inner cylinder, the first rib is arranged opposite to the first notch, and the first rib is used to absorb the oil fumes entering the inner cylinder.

[0007] In the preferred technical solution of the above-mentioned range hood, the first stiffening plate is a semi-circular ring plate, and the outer wall of the semi-circular ring plate is connected to the inner wall of the inner cylinder.

[0008] In the preferred technical solution of the above-mentioned range hood, the first rib is a spiral plate, and the outer side wall of the spiral plate is coiled on the inner side wall of the inner cylinder.

[0009] In the preferred technical solution of the above-mentioned range hood, a second notch is also provided on the inner cylinder, and the first notch and the second notch are provided opposite to each other on the inner cylinder.

[0010] In the preferred technical solution of the above-mentioned range hood, a first end plate is provided at the first end of the inner cylinder, and the inner side of the first end plate is a first notch; a first partition is also provided on the inner wall of the inner cylinder, and the first partition is located between the first notch and the second notch; a second partition is also provided on the inner wall of the inner cylinder, and the second partition is located at the end of the second notch away from the first notch, the second partition and the inner cylinder enclose an installation space for placing a detection element; a second end plate is provided at the first end of the outer cylinder; a first clearance hole is provided on both the first partition and the second partition, a second clearance hole is provided on the second end plate, and clearance grooves are provided on both the first end plate and the first rib, the clearance grooves and the first clearance hole and the second clearance hole are arranged opposite to each other; one end of the detection element is inserted into the first clearance hole provided on the second partition and extends into the second notch.

[0011] In the preferred technical solution of the above-mentioned range hood, an oil drain hole is also provided on the second end plate.

[0012] In the preferred technical solution of the above-mentioned range hood, the range hood includes two inner cylinders and two outer cylinders, with each inner cylinder corresponding to one outer cylinder.

[0013] In the preferred technical solution of the above-mentioned range hood, the detection element includes a light emitter and a light receiver; the light emitter and the light receiver are respectively installed in the two inner cylinders, wherein the inner cylinder in which the light emitter is installed is provided with a second rib on the inner side wall, the second rib is arranged opposite to the second notch, and the second rib is used to absorb the oil fumes entering the inner cylinder.

[0014] In the preferred technical solution of the above-mentioned range hood, the second rib is a semi-circular ring plate, and the outer wall of the semi-circular ring plate is connected to the inner wall of the inner cylinder.

[0015] In the preferred technical solution of the above-mentioned range hood, the second rib is a spiral plate, and the outer side wall of the spiral plate is spirally arranged on the inner side wall of the inner cylinder.

[0016] In the preferred embodiment of the above-mentioned range hood, the outer wall of the first end of the inner cylinder is provided with at least one recessed portion that is recessed into the inner cylinder.

[0017] In the preferred technical solution of the above-mentioned range hood, multiple protrusions are provided on the outer side wall of the inner cylinder; multiple grooves are provided on the inner side wall of the outer cylinder, and a protrusion is inserted into each groove.

[0018] Those skilled in the art will understand that the range hood of the present invention has a detection element in the inner cylinder, a first notch on the inner cylinder, and an outer cylinder outside the inner cylinder. The first notch and the inner sidewall of the outer cylinder are arranged opposite to each other. There is a large gap between the inner cylinder and the outer cylinder at the first notch, which facilitates contact between the oil fumes and the outer cylinder, and between the oil fumes and the inner cylinder. This allows the oil fumes to effectively adhere to the inner and outer cylinders, thereby effectively preventing the oil fumes from adhering to the detection element. The detection element can effectively and reliably detect whether there are oil fumes in the air and the concentration of oil fumes in the air, so as to facilitate timely understanding of the oil fume situation in the air and adjust the range hood speed according to the oil fume situation. Attached Figure Description

[0019] A preferred embodiment of the range hood of the present invention will now be described with reference to the accompanying drawings. The drawings are as follows:

[0020] Figure 1 This is a schematic diagram of the structure of the range hood of the present invention. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of the range hood in this invention. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the oil mesh structure in this invention;

[0023] Figure 4 This is a schematic diagram of the outer cylinder in this invention;

[0024] Figure 5 This is a schematic diagram of the inner cylinder structure in this invention. Figure 1 ;

[0025] Figure 6 This refers to the assembly of the inner cylinder and the detection element in this invention. Figure 1 ;

[0026] Figure 7 This is an assembly diagram of the bracket, volute, and outer cylinder in this invention;

[0027] Figure 8 This is an assembly diagram of the bracket, outer cylinder, and outer cylinder in this invention;

[0028] Figure 9 This is an exploded view of the support, outer cylinder, and outer tube in this invention;

[0029] Figure 10 This is a schematic diagram of the inner cylinder structure in this invention. Figure 2 ;

[0030] Figure 11 This is a schematic diagram of the inner cylinder structure in this invention. Figure 3 ;

[0031] Figure 12 This refers to the assembly of the inner cylinder and the detection element in this invention. Figure 2 ;

[0032] Figure 13 This is an assembly diagram of the outer cylinder and inner cylinder in this invention.

[0033] In the attached image:

[0034] 100: Main housing; 101: Volute housing;

[0035] 102: Air inlet; 103: Outer casing;

[0036] 104: Inner cylinder; 105: First notch;

[0037] 106: First end plate; 107: Bracket;

[0038] 108: Pipe body; 109: convex edge;

[0039] 110: First mounting hole; 111: Second mounting hole;

[0040] 112: Threading hole; 113: First stiffening plate;

[0041] 114: Second notch; 115: First partition;

[0042] 116: Second partition; 117: Slot;

[0043] 118: First clearance hole; 119: Clearance groove;

[0044] 120: Second end plate; 121: Second clearance hole;

[0045] 122: Second stiffener; 123: Recessed portion;

[0046] 124: Protrusion; 125: Groove;

[0047] 126: Oil drain hole; 127: Reinforcing rib;

[0048] 128: Deflector plate; 200: Smoke hood;

[0049] 201: Oil network; 202: Receiving area

[0050] 203: Ventilation gap; 300: Detection element. Detailed Implementation

[0051] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0052] Secondly, it should be noted that in the description of this invention, terms such as "inner" and "outer" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0053] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In related technologies, range hoods typically include a casing, a duct housing inside the casing, a fan impeller that works in conjunction with the duct housing, and a smoke collection hood located at the bottom of the fan impeller. When the fan impeller is working, it draws the fumes collected by the smoke collection hood into the duct housing, and then exhausts them outdoors, thus purifying the kitchen environment. In addition, range hoods also include detection elements and a controller. The detection elements are used to detect the concentration of fumes and moisture, and the controller is used to control the start / stop and rotation speed of the fan impeller based on the detection results.

[0055] However, detection elements are typically exposed to the air. Prolonged exposure to cooking fumes can cause the elements to become clogged, preventing them from accurately detecting the presence and concentration of cooking fumes in the air. To address this, this invention provides a range hood that places the detection element within an inner cylinder with a notch, and an outer cylinder surrounds the inner cylinder. This allows for effective contact between the cooking fumes and the inner and outer cylinders, enabling the fumes to adhere effectively to both. This reduces the amount of fumes adhering to the detection element, ensuring that even after prolonged exposure to cooking fumes, the element can still reliably and accurately detect the presence of cooking fumes.

[0056] Please refer to Figure 1 and Figure 2 The present invention provides a range hood, which may include a main housing 100, a volute 101 disposed inside the main housing 100, and a fan wheel disposed inside the volute 101 for use therewith. The fan wheel and the volute 101 are used together to extract cooking fumes.

[0057] Please refer to Figure 2The range hood may also include a smoke collection hood 200 located below the main housing 100. The smoke collection hood 200 is used to collect oil fumes. An oil filter 201 and an oil cup may also be installed inside the smoke collection hood 200. The oil filter 201 is provided with multiple ventilation gaps 203. The oil filter 201 is used to separate oil fumes and smoke fumes. The oil fumes separated by the oil filter 201 are finally collected in the oil cup. The smoke fumes separated by the oil filter 201 enter the volute 101 through the ventilation gaps 203 and are then discharged outdoors.

[0058] Please refer to Figure 3 In some embodiments, the oil mesh 201 is provided with a receiving area 202, and a plurality of ventilation gaps 203 are provided on the outer periphery of the receiving area 202. The receiving area 202 is usually positioned opposite to the stove below the range hood and the pots on the stove. The receiving area 202 is usually not provided with ventilation gaps 203.

[0059] Please refer to Figure 4 , Figure 5 and Figure 6 The range hood of the present invention also includes an outer cylinder 103 and an inner cylinder 104 disposed inside the outer cylinder 103. A detection element 300 is disposed in the inner cylinder 104 for detecting the concentration of oil fumes and water vapor. A first notch 105 is disposed on the inner cylinder 104. The first notch 105 is disposed opposite to the inner sidewall of the outer cylinder 103 so that oil fumes adhere to the outer cylinder 103 and the inner cylinder 104.

[0060] Please refer to Figure 5 The first notch 105 can be set at the outer side wall of the first end of the inner cylinder 104, and the outer side wall of the first end of the inner cylinder 104 can be a semi-cylindrical side wall. The first end of the inner cylinder 104 can also be provided with a first end plate 106, which can cover the end face of the first end of the semi-cylindrical side wall.

[0061] Please refer to Figure 7 The range hood of the present invention also includes a bracket 107, which is disposed on the outer side wall of the volute 101 and can be disposed on the volute 101 by means of welding, threaded connection or other methods. An air inlet 102 is provided on the side of the volute 101, and the bracket 107 can be semi-circular in shape, and the bracket 107 is coaxially disposed on the outer periphery of the air inlet 102.

[0062] Please refer to Figure 8 and Figure 9A tube body 108 protrudes from the outer wall of the outer cylinder 103. A flange 109 is provided at the end of the tube body 108. A first mounting hole 110 is provided on the flange 109. Correspondingly, a second mounting hole 111 is provided on the bracket 107. Fasteners are inserted into the first mounting hole 110 and the second mounting hole 111 to mount the outer cylinder 103 on the bracket 107. The bracket 107 is also provided with a wire hole 112 opposite to the tube body 108. A wire for supplying power to the detection element 300 is inserted into the wire hole 112 and the tube body 108.

[0063] In some embodiments, the range hood of this embodiment also includes a main control board, which is connected in communication with the detection element 300 and the motor for driving the impeller. The main control board is used to control the motor according to the detection result of the detection element 300, thereby controlling the start-up, shutdown and speed of the impeller.

[0064] The range hood of the present invention has a first notch 105 on the inner cylinder 104 and an outer cylinder 103 outside the inner cylinder 104. The inner sidewalls of the first notch 105 and the outer cylinder 103 are arranged opposite to each other. There is a large gap between the inner cylinder 104 and the outer cylinder 103 at the first notch 105, which facilitates the contact between the oil fumes and the outer cylinder 103, as well as between the oil fumes and the inner cylinder 104. This allows the oil fumes to effectively adhere to the inner cylinder 104 and the outer cylinder 103, thereby effectively preventing the oil fumes from adhering to the detection element 300. The detection element 300 can effectively and reliably detect whether there are oil fumes in the air and the concentration of oil fumes in the air, so as to facilitate timely understanding of the oil fume situation in the air and adjust the range hood speed according to the oil fume situation.

[0065] Please refer to Figure 10 A first stiffening rib 113 is provided on the inner wall of the inner cylinder 104. The first stiffening rib 113 is positioned opposite to the first notch 105 and is used to absorb the oil fumes entering the inner cylinder 104. There can be multiple first stiffening ribs 113 or just one. The first stiffening rib 113 can be installed on the inner cylinder 104 by welding or by integral molding.

[0066] In some embodiments, the first stiffening plate 113 is generally a rectangular plate, with two opposite sides connected to the inner wall of the inner cylinder 104. In other embodiments, the first stiffening plate 113 is a semi-circular ring plate, with its outer side wall connected to the inner wall of the inner cylinder 104, which increases the connection strength between the first stiffening plate 113 and the inner cylinder 104. In still other embodiments, the first stiffening plate 113 is a spiral plate, with its outer side wall spirally arranged on the inner wall of the inner cylinder 104, which increases the connection strength between the first stiffening plate 113 and the inner cylinder 104 and also increases the area of ​​the first stiffening plate 113, allowing oil fumes to be effectively adsorbed onto the first stiffening plate 113.

[0067] Please refer to Figure 10 and Figure 11 The inner cylinder 104 is also provided with a second notch 114, and the first notch 105 and the second notch 114 are provided opposite to each other on the inner cylinder 104. The second notch 114 can be located in the middle of the inner cylinder 104 relative to the first notch 105. The second notch 114 allows the oil fumes to come into contact with the inner cylinder 104 and the outer cylinder 103, thereby allowing the oil fumes to adhere to the inner cylinder 104 and the outer cylinder 103.

[0068] Please refer to Figure 10 The first end of the inner cylinder 104 is provided with the first end plate 106, and the inner side of the first end plate 106 is the first notch 105; a first partition 115 is also provided on the inner wall of the inner cylinder 104. The first partition 115 is located between the first notch 105 and the second notch 114. The first partition 115 can increase the connection strength of the inner cylinder 104 between the first notch 105 and the second notch 114.

[0069] Please refer to Figure 6 and Figure 12 A second partition 116 is also provided on the inner wall of the inner cylinder 104. The second partition 116 is located at the end of the second notch 114 away from the first notch 105. The second partition 116 and the inner cylinder 104 enclose an installation space, in which the detection element 300 is installed. In some embodiments, two oppositely arranged slots 117 can also be provided on the inner wall of the inner cylinder 104. The detection element 300 can be a plate-like structure, with opposite sides of the detection element 300 inserted into one slot 117 to realize the installation of the detection element 300.

[0070] Please refer to Figure 13 The outer cylinder 103 has a second end plate 120 at its first end, and the second end plate 120 and the outer cylinder 103 enclose a accommodating space for the inner cylinder 104.

[0071] Please refer to Figure 10 , Figure 12 and Figure 13 The first partition 115 and the second partition 116 are each provided with a first clearance hole 118, the second end plate 120 is provided with a second clearance hole 121, the first end plate 106 and the first stiffener 113 are each provided with a clearance groove 119, and the clearance groove 119, the first clearance hole 118 and the second clearance hole 121 are arranged opposite to each other.

[0072] Please refer to Figure 10 , Figure 12 and Figure 13One end of the detection element 300 is inserted into the first clearance hole 118 provided on the second partition 116 and extends into the second notch 114. The first clearance hole 118, the second clearance hole 121 and the clearance groove 119 on the first partition 115 are used to avoid signals emitted or received by the detection element 300.

[0073] Please refer to Figure 2 ,According to Figure 10 , Figure 13 The second end plate 120 is also provided with an oil drain hole 126. When the oil fumes attached to the inner cylinder 104 accumulate into oil droplets, the oil droplets on the inner cylinder 104 can fall into the outer cylinder 103. Moreover, the oil fumes attached to the outer cylinder 103 will also accumulate into oil droplets. The oil droplets falling into the outer cylinder 103 and the oil droplets accumulating on the outer cylinder 103 can be discharged from the oil drain hole 126. The discharged oil droplets can fall directly or indirectly onto the receiving area 202 on the oil mesh 201 and then be collected into the oil cup of the range hood.

[0074] Please refer to Figure 8 and Figure 9 The range hood includes two inner cylinders 104 and two outer cylinders 103. Each inner cylinder 104 is correspondingly installed in one outer cylinder 103, and a detection element 300 can be installed in each inner cylinder 104.

[0075] In some embodiments, the detection element 300 disposed within an inner cylinder 104 can detect the oil fume condition independently. In some embodiments, the detection element 300 includes a light emitter and a light receiver, which are respectively disposed within an inner cylinder 104, and the light emitter and light receiver need to be used in conjunction.

[0076] Please refer to Figure 8 Two outer cylinders 103 can be set at both ends of a semi-circular bracket 107. An inner cylinder 104 for mounting a light emitter is installed inside the outer cylinder 103 at one end of the bracket 107, and an inner cylinder 104 for mounting a light receiver is installed inside the outer cylinder 103 at the other end of the bracket 107. The light emitter emits light, and the light receiver receives light. When the environment in which the light emitter and receiver are located is an oil fume environment, the light emitted by the light emitter is scattered after encountering oil fume particles. After the scattered light reaches the light receiver, the light received by the light receiver will vary depending on the concentration of oil fume. Thus, the concentration of oil fume can be detected through the cooperation of the light receiver and the light emitter.

[0077] Please refer to Figure 2 and Figure 7In some embodiments, a guide plate 128 is provided below the outer cylinder 103 on which the light emitter is installed. The top of the guide plate 128 is located directly below the oil drain hole 126 of the outer cylinder 103, and the bottom of the guide plate 128 is positioned opposite to the receiving area 202 on the oil mesh 201. When oil droplets are discharged from the oil drain hole 126 on the outer cylinder 103, the oil droplets will fall onto the guide plate 128, and then flow from the guide plate 128 to the receiving area 202 of the oil mesh 201, and finally be collected in the oil cup.

[0078] Please refer to Figure 7 The width of the deflector 128 gradually decreases from top to bottom. For example, the deflector 128 is roughly triangular. The first side of the deflector 128 is connected to the bracket 107. The second side of the deflector 128 is inclined relative to the first side of the deflector 128. The third side of the deflector 128 is roughly perpendicular to the bracket 107. The distance between the second side of the deflector 128 and the first side of the deflector 128 gradually decreases from top to bottom. Thus, the end with the larger width of the deflector 128 is the top of the deflector 128, and the end with the smaller width of the deflector 128 is the bottom of the deflector 128. The width of the deflector 128 gradually decreases from the top to the bottom of the deflector 128. When oil droplets fall onto the guide plate 128, as the width of the guide plate 128 gradually decreases, the oil droplets will gradually converge from top to bottom on the guide surface of the guide plate 128 and then fall onto the receiving area 202. That is, the width of the guide plate 128 gradually decreases from top to bottom, which can play a role in converging the oil droplets that fall onto the guide plate 128.

[0079] Please refer to Figure 8 One end of the guide plate 128 is fixed to the bracket 107. Reinforcing ribs 127 are provided on the guide surface of the guide plate 128. The first side of the reinforcing rib 127 is connected to the bracket 107, and the second side of the reinforcing rib 127 is connected to the guide plate 128. Thus, the reinforcing ribs 127 ensure that the guide plate 128 is reliably mounted on the bracket 107. The number of reinforcing ribs 127 can be multiple; for example, three reinforcing ribs 127 can further ensure that the guide plate 128 is reliably mounted on the bracket 107.

[0080] Please refer to Figure 2 In some embodiments, the oil drain hole 126 of the outer cylinder 103 with the light receiver is located directly above the oil mesh 201. When the oil droplets are discharged from the oil drain hole 126 on the outer cylinder 103, the oil droplets will fall directly onto the receiving area 202 of the oil mesh 201 and finally be collected into the oil cup.

[0081] Please refer to Figure 11In the inner cylinder 104 where the light emitter is installed, a second rib 122 is also provided on the inner side wall of the inner cylinder 104. The second rib 122 is arranged opposite to the second notch 114 and is used to absorb the oil fumes entering the inner cylinder 104. There can be multiple second ribs 122 or just one. The second rib 122 can be set on the inner cylinder 104 by welding or by integral molding.

[0082] In some embodiments, the second stiffener 122 is generally a rectangular plate, with two opposite sides connected to the inner wall of the inner cylinder 104. In other embodiments, the second stiffener 122 is a semi-circular ring plate, with its outer side connected to the inner wall of the inner cylinder 104, which increases the connection strength between the second stiffener 122 and the inner cylinder 104. In still other embodiments, the second stiffener 122 is a spiral plate, with its outer side spirally arranged on the inner wall of the inner cylinder 104, which increases the connection strength between the second stiffener 122 and the inner cylinder 104 and also increases the area of ​​the second stiffener 122, allowing for effective adsorption of oil fumes onto the second stiffener 122.

[0083] Please refer to Figure 12 The outer wall of the first end of the inner cylinder 104 is provided with at least one recess 123 that is recessed into the inner cylinder 104. The recess 123 can increase the gap between the inner cylinder 104 and the outer cylinder 103, thereby enabling the oil fumes to be effectively adsorbed on the inner cylinder 104 and the outer cylinder 103.

[0084] Please refer to Figure 4 and Figure 10 The inner cylinder 104 has multiple protrusions 124 on its outer side wall and the outer cylinder 103 has multiple grooves 125 on its inner side wall, with a corresponding protrusion 124 inserted into each groove 125. This allows for the limitation of the relative rotation between the inner cylinder 104 and the outer cylinder 103.

[0085] Please continue to refer to Figure 4 and Figure 10 In some embodiments, the number of protrusions 124 can be two, and the number of grooves 125 provided on the inner sidewall of the outer cylinder 103 is two, with one protrusion 124 inserted into each groove 125.

[0086] The range hood of the present invention can effectively prevent oil fumes from adhering to the detection element 300. The detection element 300 can effectively and reliably detect whether there are oil fumes in the air and the concentration of oil fumes in the air, so as to facilitate timely understanding of the oil fume situation in the air and adjust the range hood speed according to the oil fume situation.

[0087] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A range hood, characterized in that, It includes an outer cylinder and an inner cylinder disposed within the outer cylinder, wherein a detection element is disposed in the inner cylinder; The inner cylinder is provided with a first notch, and the first notch is disposed opposite to the inner sidewall of the outer cylinder so that the oil fumes adhere to the outer cylinder and the inner cylinder; The first notch is located on the outer side wall of the first end of the inner cylinder, and the outer side wall of the first end of the inner cylinder is a semi-cylindrical side wall. The first end of the inner cylinder is provided with a first end plate, and the first end plate covers the end face of the first end of the semi-cylindrical side wall. A first rib is provided on the inner wall of the inner cylinder. The first rib is arranged opposite to the first notch. The first rib is used to absorb the oil fumes entering the inner cylinder. The inner cylinder is also provided with a second notch, and the first notch and the second notch are provided on the inner cylinder opposite to each other; One end of the detection element extends into the second notch.

2. The range hood according to claim 1, characterized in that, The first stiffener is a semi-circular ring plate, and the outer wall of the semi-circular ring plate is connected to the inner wall of the inner cylinder. or, The first stiffener is a spiral plate, and the outer side wall of the spiral plate is spirally arranged on the inner side wall of the inner cylinder.

3. The range hood according to claim 2, characterized in that, The inner cylinder is provided with a first end plate at its first end, and the inner side of the first end plate is the first notch; A first partition is also provided on the inner wall of the inner cylinder, and the first partition is located between the first notch and the second notch; A second partition is also provided on the inner wall of the inner cylinder. The second partition is located at the end of the second notch away from the first notch. The second partition and the inner cylinder enclose an installation space for placing the detection element. The outer cylinder is provided with a second end plate at its first end; Both the first partition and the second partition are provided with a first clearance hole, the second end plate is provided with a second clearance hole, and both the first end plate and the first stiffener are provided with a clearance groove, which is arranged opposite to the first clearance hole and the second clearance hole; One end of the detection element is inserted into the first clearance hole provided on the second partition.

4. The range hood according to claim 3, characterized in that, The second end plate is also provided with an oil drain hole.

5. The range hood according to any one of claims 2-4, characterized in that, The range hood includes two inner cylinders and two outer cylinders, with each inner cylinder corresponding to one of the outer cylinders.

6. The range hood according to claim 5, characterized in that, The detection element includes a light emitter and a light receiver; The light emitter and the light receiver are respectively installed in the two inner cylinders. In the inner cylinder in which the light emitter is installed, a second rib is also provided on the inner side wall of the inner cylinder. The second rib is arranged opposite to the second notch and is used to absorb the oil fumes entering the inner cylinder.

7. The range hood according to claim 6, characterized in that, The second stiffener is a semi-circular ring plate, and the outer wall of the semi-circular ring plate is connected to the inner wall of the inner cylinder. or, The second stiffener is a spiral plate, and the outer side wall of the spiral plate is spirally arranged on the inner side wall of the inner cylinder.

8. The range hood according to any one of claims 1-4, characterized in that, The outer wall of the first end of the inner cylinder is provided with at least one recessed portion that is recessed into the interior of the inner cylinder; and / or, The outer side wall of the inner cylinder is also provided with a plurality of protrusions; the inner side wall of the outer cylinder is also provided with a plurality of grooves, and one protrusion is inserted into each groove.

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