An oil fume exhaust fan air duct and an oil fume extractor

Abstract

The application discloses an oil fume machine air duct and an oil fume machine, and solves the technical problem that current oil fume machines cannot consider oil fume suction effect and noise. The oil fume machine air duct is internally provided with an oil fume passage for oil fume circulation; along the oil fume suction direction, the oil fume passage is sequentially provided with an acceleration section, a rectification section and an expansion section, and the cross-sectional area of the rectification section is not greater than the cross-sectional area of the acceleration section and the cross-sectional area of the expansion section. The oil fume machine comprises a rack assembly and a head assembly, the oil fume machine air duct is arranged in the head assembly, and an oil fume suction port of the head assembly, the oil fume machine air duct and a smoke guide cavity of the rack assembly are sequentially communicated. The oil fume machine air duct provided by the application can improve the oil fume suction effect without changing the power of a motor, and through structural design of the oil fume passage, the flow state of oil fume gas flow can be improved, internal problems such as cyclone, vortex and head-on collision can be solved, noise can be reduced, and the oil fume suction effect and noise of the oil fume machine can be considered.

Description

Technical Field

[0001] This application belongs to the field of household appliance technology, specifically relating to a range hood duct and a range hood. Background Technology

[0002] With the improvement of living standards, range hoods have gradually become an indispensable appliance in people's kitchens. Range hoods are usually installed above the stove. They contain a motor that drives the impeller to rotate, thereby creating suction to quickly remove the exhaust fumes produced by the stove and the harmful oil fumes generated during cooking, and exhaust them outdoors, thus reducing air pollution in the kitchen.

[0003] Current range hoods generally have multiple suction levels with different levels of suction power. When the highest level is set, the motor output power is high, resulting in stronger suction and better smoke extraction. However, the operating noise of the range hood also increases, affecting the user experience and thus limiting further improvements in the smoke extraction effect. Summary of the Invention

[0004] To address the technical problem that current range hoods cannot simultaneously achieve effective smoke extraction and low noise levels, this application provides a range hood duct and a range hood.

[0005] One technical solution adopted in this application is: providing a range hood duct, wherein the range hood duct is provided with a fume channel for the flow of fumes; along the direction of fume extraction, the fume channel is sequentially composed of an acceleration section, a rectification section and an expansion section, wherein the cross-sectional area of ​​the rectification section is not greater than the cross-sectional area of ​​the acceleration section and the cross-sectional area of ​​the expansion section.

[0006] As can be seen from the above technical solution, the range hood duct provided in this application uses a variable cross-section channel for the internal oil fume circulation, unlike the existing columnar straight ventilation duct. The oil fume channel provided in this application consists of an acceleration section, a rectification section, and an expansion section along the oil fume absorption direction. The cross-sectional area of ​​different sections in the oil fume channel changes continuously along the oil fume absorption direction. Specifically, the cross-sectional area of ​​the rectification section is no greater than the cross-sectional area of ​​the acceleration section and the expansion section. In other words, the cross-sectional area of ​​the rectification section located in the middle of the entire oil fume channel is the smallest, so as to form a neck in the middle of the oil fume channel. Therefore, when the fumes enter the fume extraction channel, they are accelerated during the flow from the acceleration section to the rectification section, increasing the airflow velocity. This helps to increase the negative pressure range at the front end and improve the fume extraction effect. The rectification section is a constriction section with the smallest opening size, which can rectify the fume airflow, improve the flow state of the fume airflow, solve problems such as internal cyclones, eddies, and countercurrents, and reduce noise. The opening size of the expansion section is larger than that of the constriction section. The fume airflow after rectification slows down in the expansion section, which is conducive to being fully extracted and reducing smoke escape.

[0007] Compared with the prior art, the range hood duct provided in this application can improve the smoke extraction effect without changing the motor power. Furthermore, the smoke duct structure design can improve the flow state of the smoke airflow, solve problems such as internal cyclones, eddies, and convection, reduce noise, and balance the smoke extraction effect and noise level of the range hood.

[0008] In some embodiments, the cross-sectional area of ​​the acceleration section gradually decreases along the direction of fume extraction, while the cross-sectional area of ​​the expansion section gradually increases along the direction of fume extraction.

[0009] By setting both the acceleration and expansion sections as gradual channels, the flow resistance of the oil fume airflow is reduced, thereby gradually accelerating and decelerating the oil fume airflow, improving the oil fume extraction effect, and reducing noise.

[0010] In some embodiments, the range hood duct includes a first side baffle and a second side baffle arranged at intervals, and a first cover plate and a second cover plate arranged at intervals and in parallel, wherein the first side baffle, the second side baffle, the first cover plate and the second cover plate together form the fume channel;

[0011] The distances between the first side baffle and the second side baffle in the acceleration section, the rectification section and the expansion section are d1, d2 and d3 respectively, where d2≤d1 and d2≤d3.

[0012] By setting the housing of the range hood duct as four plates, with the first cover plate and the second cover plate spaced apart and parallel, this structure better fits the shape of existing range hoods; and since two opposite sides of the range hood duct are parallel, the cross-sectional area of ​​different sections of the fume duct can be changed by adjusting the distance between the first side baffle and the second side baffle, thus reducing the structural difficulty of the range hood duct.

[0013] In some embodiments, the distance d2 between the first side baffle and the second side baffle in the rectifying section is L1; the maximum opening size of the acceleration section and the expansion section is the same and is L2, and 0.7L2≤L1 <L2。

[0014] By setting the rectifier section as a fixed cross-section channel, the rectification effect of the oil fume airflow in the rectifier section is ensured; by setting the ratio of the width of the rectifier section channel to the maximum width of the oil fume channel, noise is reduced as much as possible while ensuring sufficient air intake.

[0015] In some embodiments, along the direction of fume extraction, the lengths of the acceleration section, the rectification section, and the expansion section are L5, L4, and L3, respectively, where 0.5L5≤L4≤L5, and L5 <L3。

[0016] The range hood duct provided in this application has three channels, each with a certain length. This makes the length-to-width ratio of the range hood duct provided in this application greater than that of common range hoods on the market. The extra-long range hood duct can significantly improve the airflow inside the duct head, and the increased length of the range hood duct allows it to be closer to the smoke source, which can solve the problem of poor smoke extraction effect.

[0017] In some embodiments, the range hood duct also includes an intermediate guide located in the fume channel.

[0018] By setting up an intermediate guide component, two sub-channels are formed in the fume duct, which can improve the negative pressure distribution on both sides of the fume duct and optimize the smoke extraction effect of the left and right stoves.

[0019] In some embodiments, the intermediate guide includes a first intermediate baffle assembly and a second intermediate baffle assembly spaced apart along the direction of smoke extraction; the first intermediate baffle assembly is located in the acceleration section and / or the rectification section; and the second intermediate baffle assembly is located in the expansion section.

[0020] Since the acceleration and rectification sections of the fume extraction duct play a major role in resolving airflow cyclones and eddies, a first intermediate baffle assembly is installed in the acceleration and / or rectification sections. The arrangement of this first intermediate baffle assembly allows for continuous changes in its cross-section, accelerating the airflow velocity at the fan head, increasing the negative pressure range at the front end, reducing eddies, cyclones, and convection, and lowering noise. A second intermediate baffle assembly is installed in the expansion section, separating the fume airflow into two beams that can then be separately drawn into the range hood's fan, improving the fume extraction effect.

[0021] In some embodiments, the range hood duct includes a first side baffle and a second side baffle arranged at intervals, and a first cover plate and a second cover plate arranged at intervals and in parallel, wherein the first side baffle, the second side baffle, the first cover plate and the second cover plate together form the fume channel;

[0022] The intermediate guide component divides the fume duct equally; the minimum distance between the first intermediate baffle assembly and the first side baffle / second side baffle is d4, and the distance between the inlet end of the second intermediate baffle assembly and the first side baffle / second side baffle is d5, d4=d5=L6, where: 0.5L1≤L6≤0.5L2, L1 is the distance between the first side baffle and the second side baffle in the rectification section; L2 is the maximum opening size of the fume duct.

[0023] By setting the width of the contact area between the airflow in the sub-channel and the first intermediate baffle assembly and the second intermediate baffle assembly, the pressure loss of the oil fume airflow is minimized when it flows in the range hood duct, ensuring sufficient air intake.

[0024] In some embodiments, at least one of the first side baffle, the second side baffle, the first intermediate baffle assembly, and the second intermediate baffle assembly is a perforated plate; a sound-absorbing layer is provided on the side of the perforated plate that does not come into contact with the oil fumes.

[0025] By setting the baffles as perforated plates, a reduced anechoic space is formed between two adjacent anechoic surfaces. Sound reflects and absorbs each other within the anechoic space, which can effectively reduce the sound intensity inside the rack. In addition, some noise can be absorbed by the sound-absorbing layer after passing through the holes of each baffle, which can effectively absorb some mid-to-high frequency noise.

[0026] In some embodiments, the aperture D of the holes in the perforated plate is 2mm ≤ D ≤ 5mm; the opening ratio of the perforated plate is 50% to 80%.

[0027] Another technical solution adopted in this application is: providing a range hood, including:

[0028] A frame assembly, wherein a smoke guide chamber and a fan are provided in the smoke guide chamber;

[0029] And, a head assembly, wherein the head assembly is provided with an oil fume inlet and the aforementioned range hood duct, wherein the oil fume inlet, the range hood duct and the smoke guiding chamber are connected in sequence.

[0030] As can be seen from the above technical solution, the range hood provided in this application adopts the aforementioned range hood duct. The air inlet of the range hood duct is connected to the smoke inlet, and the air outlet is connected to the smoke guiding chamber. The oily smoke generated by the smoke source enters the range hood duct from the smoke inlet. The range hood duct accelerates, rectifies, and expands the oily smoke airflow before it enters the smoke guiding chamber and is then extracted by the fan. After the airflow is accelerated, rectified, and expanded by the range hood duct, the internal flow state of the head is improved, solving problems such as internal cyclones and eddies, and reducing noise. In addition, because the airflow is accelerated, the negative pressure of the entire duct can be increased, thereby reducing the negative pressure of the smoke inlet and improving the smoke extraction effect.

[0031] In some embodiments, the rack assembly further includes:

[0032] The frame has an exhaust port on its top and a smoke guide chamber formed inside the frame. The fan is installed in the smoke guide chamber with its main air inlet close to the exhaust port and its secondary air inlet away from the exhaust port.

[0033] A decorative cover is provided on the outer surface of the frame;

[0034] In addition, a check valve is installed in the exhaust port, and the exhaust port of the fan is connected to the check valve.

[0035] By setting the fan's installation orientation so that the main air inlet is close to the fume extraction port and the secondary air inlet is far away from the fume extraction port, most of the fumes can enter through the main air inlet, while a small portion of the fumes enter the fan through the secondary air inlet, improving the suction effect. After the fan performs its work, the fumes are discharged through the check valve to prevent backflow.

[0036] In some embodiments, the head assembly further includes:

[0037] The range hood duct is located in the head unit, and the fume extraction port is located at the lower part of the head unit;

[0038] An oil cup is provided and located at the bottom of the machine head;

[0039] A top plate is disposed on the top of the machine head;

[0040] A glass panel covers the outer surface of the machine head;

[0041] An oil filter is installed in the fume extraction port, and the vertical projection of the oil filter falls into the opening formed by the oil cup;

[0042] The opening and closing plate is rotatably disposed at the lower part of the machine head, and when the opening and closing plate rotates, the oil screen is covered or exposed by the opening and closing plate.

[0043] By setting a rotating opening and closing plate, the negative pressure zone can be increased by opening the plate during operation to reduce the escape of oil fumes; when the machine is stopped, the opening and closing plate can be closed to cover the oil screen and prevent accidental contact with the oil screen. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A schematic diagram of the duct structure of the range hood in an embodiment of this application is shown.

[0046] Figure 2 It shows Figure 1 The flow field diagram of the airflow inside the duct of a range hood.

[0047] Figure 3 It shows Figure 1 Exploded view of the perforated plate and sound-absorbing layer in the duct of a range hood.

[0048] Figure 4 A schematic diagram of the range hood in the closed state of the opening and closing plate is shown in the embodiment of this application.

[0049] Figure 5 A schematic diagram of the range hood in the open state of the opening and closing plate is shown in the embodiment of this application.

[0050] Figure 6 An exploded view of the range hood in an embodiment of this application is shown.

[0051] Figure 7 It shows Figure 4 , Figure 5 The flow field diagram of airflow in a range hood.

[0052] Figure 8 It shows Figure 7 The flow field diagram of airflow in the duct of a range hood.

[0053] Figure 9 The diagram shows the overall structure of a European-style range hood in the prior art.

[0054] Figure 10 The diagram shows the overall structure of a near-suction range hood in the prior art.

[0055] Attached image labeling: 100 - Range hood.

[0056] 10-Rain hood duct; 11-Fume duct; 111-Acceleration section; 112-Rectifying section; 113-Expansion section; 12-First side baffle; 13-Second side baffle; 14-First intermediate baffle assembly; 15-Second intermediate baffle assembly; 16-Perforated plate; 161-Perforation; 17-Sound absorption layer.

[0057] 20-Frame assembly; 21-Frame; 211-Smoke duct; 22-Fan; 221-Voltage; 222-Voltage support; 223-Impeller; 224-Motor; 225-Oil nozzle; 226-Main air inlet; 227-Secondary air inlet; 23-Check valve; 24-Decorative cover.

[0058] 30-Head assembly; 31-Opening and closing plate; 32-Oil cup assembly; 33-Oil screen; 34-Head assembly; 341-Fume extraction port; 342-Rear end plate; 343-Front end plate; 35-Top plate; 36-Glass panel. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0060] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0061] This application is described below with reference to the accompanying drawings and specific embodiments:

[0062] This application provides a range hood duct and a range hood, which can at least partially solve the technical problem that current range hoods cannot balance smoke extraction effect and noise.

[0063] Example 1:

[0064] This application provides a range hood duct 10, such as... Figure 1 and Figure 2 The diagram shows the overall structure and internal airflow field of the range hood duct 10. The range hood duct 10 is an essential component of the range hood 100, specifically installed within the head assembly 30 of the range hood 100. The head assembly 30 serves as a transition stage after the fumes enter. Figure 8 The specific installation position of the range hood duct 10 in the range hood 100 is shown. The range hood duct 10 is provided with a fume channel 11 for the flow of fumes. When the fumes flow in the fume channel 11, their flow state is improved, which can improve the fume extraction effect and reduce noise.

[0065] See also Figure 1 and Figure 2 Along the direction of smoke extraction, the smoke extraction channel 11 consists of an acceleration section 111, a rectification section 112, and an expansion section 113. The cross-sectional area of ​​the rectification section 112 is no greater than the cross-sectional area of ​​the acceleration section 111 and the cross-sectional area of ​​the expansion section 113 (referring to the cross-sectional area, which can be intuitively understood as the area of ​​the cross-section perpendicular to the direction of smoke extraction, the same below). After the incoming gas is accelerated, rectified, and expanded by the range hood duct 10, the flow state inside the head unit 34 is improved, solving problems such as internal cyclones and eddies, and reducing noise. In addition, the accelerated airflow increases the negative pressure of the entire duct, thereby lowering the negative pressure of the smoke extraction port 341 and improving the smoke extraction effect.

[0066] Unlike existing columnar straight ventilation ducts, the range hood duct 10 of this embodiment uses a variable cross-section channel 11 for the internal flow of oil fumes. This means that the cross-sectional area of ​​different sections of the oil fume channel 11 changes continuously along the direction of oil fume absorption. Specifically, the cross-sectional area of ​​the rectifying section 112 is no greater than the cross-sectional area of ​​the accelerating section 111 and the expanding section 113. In other words, the cross-sectional area of ​​the rectifying section 112 located in the middle of the entire oil fume channel 11 is the smallest, thus forming a neck in the middle of the oil fume channel 11. Therefore, when the fumes enter the fume duct 11, they are accelerated during the flow from the acceleration section 111 to the rectification section 112, increasing the airflow velocity and thus increasing the negative pressure range at the front end, thereby improving the fume extraction effect. The rectification section 112 is a constriction section with the smallest opening size, which can rectify the fume airflow, improve the flow state of the fume airflow, solve problems such as internal cyclones, eddies, and countercurrents, and reduce noise. The opening size of the expansion section 113 is larger than that of the constriction section. The rectified fume airflow slows down in the expansion section 113, which is conducive to being fully extracted and reducing smoke escape.

[0067] In terms of cross-sectional area design, the cross-sectional area of ​​each of the three segments—acceleration section 111, rectification section 112, and expansion section 113—can remain constant. However, the cross-sectional areas of adjacent segments should be different, with the cross-sectional area of ​​the middle rectification section 112 being smaller than that of the two ends of the acceleration section 111 and expansion section 113. In some embodiments, at least one of the three segments—acceleration section 111, rectification section 112, and expansion section 113—can be designed as a variable cross-sectional area channel. At the connection between the variable cross-sectional area segment and the fixed cross-sectional area segment, to reduce flow resistance, the shapes and cross-sectional areas of the two segments are identical. This variable cross-sectional area design ensures that the cross-sectional area of ​​the middle rectification section 112 is smaller than that of the two ends of the acceleration section 111 and expansion section 113. The specific design of the cross-sectional area of ​​the range hood duct 10 is not limited in this application and can be determined according to actual needs.

[0068] See details Figure 1 In some embodiments, the cross-sectional area of ​​the acceleration section 111 of the range hood duct 10 gradually decreases along the direction of smoke extraction, meaning the acceleration section 111 is generally a conical channel, and its minimum cross-sectional area is the same as that of the rectifier section 112. Alternatively, the cross-sectional area of ​​the expansion section 113 of the range hood duct 10 can also be set to gradually increase along the direction of smoke extraction, meaning the expansion section 113 is generally a conical channel, and its minimum cross-sectional area is the same as that of the rectifier section 112. The rectifier section 112 uses a fixed cross-sectional area. By setting both the acceleration section 111 and the expansion section 113 as gradually changing channels, it is beneficial to reduce the flow resistance of the smoke airflow, thereby gradually accelerating and decelerating the smoke airflow, improving the smoke extraction effect, and reducing noise.

[0069] In the overall structural design of the range hood duct 10, in some embodiments, the variable cross-section channel structure of the range hood duct 10 can be achieved by designing the range hood duct 10 as an integral variable diameter pipe; in other embodiments, the range hood duct 10 can also be designed as a multi-plate splicing assembly, and the cross-sectional area of ​​the fume channel 11 can be changed by changing the structure of one or more plates. The specific design of the overall structure and cross-sectional area of ​​the range hood duct 10 is not limited in this application and can be determined according to actual needs.

[0070] See details Figure 1 In some embodiments, the range hood duct 10 includes a first side baffle 12, a second side baffle 13, a first cover plate, and a second cover plate. The first side baffle 12, the second side baffle 13, the first cover plate, and the second cover plate together form a fume channel 11, which is a polyhedral columnar channel. Specifically: the first side baffle 12 and the second side baffle 13 are spaced apart and represent two opposite faces of the polyhedron; the first cover plate and the second cover plate are spaced apart and parallel to each other, representing the other two opposite faces of the polyhedron. The first cover plate and the second cover plate can be separate plates, or a portion of the mounting portion of the range hood duct 10, i.e., the head assembly 30, can be used as the first cover plate and the second cover plate, for example: Figure 7 In some embodiments, the rear end plate 342 and the front end plate 343 of the head unit 34 are shown as the first cover plate and the second cover plate of the range hood duct 10, respectively. The resulting fume duct 11 is a polyhedral columnar duct with a constant thickness and varying width. Therefore, the change in the cross-sectional area of ​​the fume duct 11 is equivalent to the change in the distance between the first side baffle 12 and the second side baffle 13. That is, the distances between the first side baffle 12 and the second side baffle 13 in the acceleration section 111, the rectification section 112, and the expansion section 113 are d1, d2, and d3, respectively, where d2 ≤ d1 and d2 ≤ d3.

[0071] More specifically, both the first side baffle 12 and the second side baffle 13 are bent plates, and at least three bent plates, so that different bent sections in the first side baffle 12 and the second side baffle 13 constitute different segments of the fume duct 11. The specific bending conditions of the first side baffle 12 and the second side baffle 13 can be the same or different, and the installation positions of the first side baffle 12 and the second side baffle 13 can be axially symmetrical or centrally symmetrical, as long as the cross-sectional area of ​​the fume duct 11 is satisfied. The specific form is not limited in this application.

[0072] By arranging the casing of the range hood air duct 10 as four plate members, with the first cover plate and the second cover plate spaced apart and arranged in parallel, this structure better conforms to the shape of the existing range hood 100; and since two opposite side surfaces of the range hood air duct 10 are parallel surfaces, the cross-sectional area of different sections of the oil fume channel 11 can be changed by adjusting the spacing between the first side baffle 12 and the second side baffle 13, thereby reducing the structural difficulty of the range hood air duct 10.

[0073] For specific details, please refer to Figure 1 and Figure 2 , an embodiment of the range hood air duct 10 is illustrated, wherein both the first side baffle 12 and the second side baffle 13 are three-section bent plates, the bending structures of the first side baffle 12 and the second side baffle 13 are completely identical, and the first side baffle 12 and the second side baffle 13 are arranged axisymmetrically about a central axis, the projection of the formed oil fume channel 11 in the front view direction ( Figure 1 and Figure 2 both are front views) is a structure with tapered ends and a rectangular middle portion. By arranging the rectification section 112 as a constant cross-section channel, the rectification effect of oil fume airflow in the rectification section 112 is ensured. Moreover, in order to further improve the interchangeability of parts and reduce the installation difficulty, the maximum opening dimension of the acceleration section 111 and the expansion section 113 (that is, the horizontal dimension in the front view, which is also referred to as the transverse dimension or width hereinafter) is the same.

[0074] More specifically, the first side baffle 12 and the second side baffle 13 can be manufactured from a single plate through a bending process, or can be manufactured from a plurality of flat plates or bent plates through welding. The present application does not limit the specific form. Referring to Figure 1 , in order to reduce noise as much as possible while ensuring sufficient air intake, the key dimensions of each baffle are limited as follows: the rectification section 112 is a constant-width section, and its width, that is the spacing d2 between the first side baffle 12 and the second side baffle 13, is a fixed value L1; the maximum opening dimension of the acceleration section 111 and the expansion section 113 is the same and both are L2, then the relationship between the opening width of the rectification section 112 and the maximum opening width of the entire oil fume channel 11 satisfies: 0.7L2≤L1<L2, for example, L1 is specifically 0.72L2, 0.75L2, 0.79L2, 0.81L2, 0.85L2, 0.9L2 or 0.95L2. For the dimension of different sections along the oil suction direction (that is, the vertical dimension in the front view, which is also referred to as the vertical dimension or height hereinafter), the relationship between the height L5 of the acceleration section 111, the height L4 of the rectification section 112, and the height L3 of the expansion section 113 satisfies: 0.5L5≤L4≤L5, and L5<L3.

[0075] The above ratios were obtained by analyzing parameters such as the shape, area, and pressure loss of the vortex zone under different air volumes and pressures. This approach can better eliminate vortex generation, minimize energy loss, maximize the air volume and pressure of the range hood 100, ensure the smoke extraction effect of the range hood 100, and minimize noise.

[0076] Because each of the three channel segments of the range hood duct 10 has a certain length, the aspect ratio of the range hood duct 10 provided in this application is larger than that of commonly available range hoods 100. The total height L (i.e., L5+L4+L3) of the range hood duct 10 is ≥0.8L2. The extra-long range hood duct 10 can significantly improve the airflow state inside the head unit 34, and the increased length of the range hood duct 10 allows it to be closer to the smoke source, thus solving the problem of poor smoke extraction. In addition, the thickness B (i.e., the distance between the first cover plate and the second cover plate, with the thickness direction perpendicular to the horizontal and vertical directions) of the range hood duct 10 is relatively small, generally B≤0.2L2, which means that the range hood duct 10 does not occupy the cooking operation space, thus allowing the range hood duct 10 to be closer to the smoke source.

[0077] To address the issue of inconsistent smoke extraction performance on both sides of the cooktop in existing range hoods (100 models), with one side performing relatively worse, a solution is needed to balance the smoke extraction effect on both sides and improve overall smoke extraction performance. (Refer to...) Figure 1 and Figure 2 In some embodiments, the range hood duct 10 further includes an intermediate guide member located within the fume channel 11, specifically between the first side baffle 12 and the second side baffle 13. In the thickness direction, the two sides of the intermediate guide member can selectively contact the first cover plate and the second cover plate, respectively. By providing the intermediate guide member, two sub-channels are formed within the fume channel 11, which can improve the negative pressure distribution on both sides of the fume channel 11, thereby optimizing the fume extraction effect on both the left and right burners.

[0078] Since different sections of the fume extraction duct 11 contribute differently to improving the flow of fumes, in order to more effectively improve the fume extraction effect and reduce noise, please refer to... Figure 1 and Figure 2In some embodiments, the intermediate guide member includes a first intermediate baffle assembly 14 and a second intermediate baffle assembly 15, which are spaced apart along the direction of oil fume extraction. The first intermediate baffle assembly 14 is located in the acceleration section 111 and / or the rectification section 112. That is, the first intermediate baffle assembly 14 can be completely disposed in the acceleration section 111 or the rectification section 112, or it can be partially disposed in the acceleration section 111 and partially disposed in the rectification section 112. It is understood that since the rectification section 112 has the smallest cross-sectional area, the first intermediate baffle assembly 14 should be located as much as possible in the acceleration section 111. Since the acceleration section 111 and the rectifier section 112 of the fume duct 11 play a major role in solving the problems of airflow cyclones and eddies, a first intermediate baffle assembly 14 is set in the acceleration section 111 and / or the rectifier section 112. The arrangement of the first intermediate baffle assembly 14 can achieve continuous changes in cross-section, accelerate the airflow velocity of the head 34, increase the negative pressure range at the front end, reduce eddies, cyclones and countercurrents, and reduce noise. The second intermediate baffle assembly 15 is located in the expansion section 113. By setting the second intermediate baffle assembly 15 in the expansion section 113, the fume airflow in the expansion section 113 is separated into two beams, which can be respectively merged into the fan 22 of the range hood 100, thereby improving the fume extraction effect.

[0079] The function of the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15 is to separate the fume duct 11 and change the cross-sectional area of ​​the sub-duct. Therefore, the shape and size of the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15 are not specifically limited in this application. In the thickness direction, the two sides of the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15 can be selectively in contact with the first cover plate and the second cover plate respectively, so as to intermittently and completely separate the fume duct 11.

[0080] From the perspective of fume extraction effect, the intermediate guide component is set as an equally divided fume channel 11, that is, the first side baffle 12 and the second side baffle 13 are set as axisymmetric, and the axis of symmetry is denoted as the central axis; the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15 are both set as symmetrical structures with the central axis as the axis of symmetry, so as to form two identical and symmetrical sub-channels between the first intermediate baffle assembly 14 / second intermediate baffle assembly 15 and the first side baffle 12 / second side baffle 13. The negative pressure inside the head 34 is roughly evenly distributed from left to right through the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15, thereby achieving relatively equal airflow into the left and right oil meshes 33, ensuring the fume extraction effect of the left and right stoves.

[0081] Due to the presence of the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15, the width of the channel in the fume duct 11 where the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15 are located is reduced. Since the first intermediate baffle assembly 14 is located in the acceleration section 111 and / or the rectification section 112, the channel width gradually decreases from the acceleration section 111 to the rectification section 112. Therefore, it is necessary to consider the minimum distance between the first intermediate baffle assembly 14 and the first side baffle 12 / second side baffle 13, and this minimum distance is denoted as d4. The second intermediate baffle assembly 15 is located in the expansion section 113, and the channel width gradually increases from the rectification section 112 to the expansion section 113. Therefore, it is necessary to consider the distance between the inlet end of the second intermediate baffle assembly 15 (i.e., the end closer to the rectification section 112) and the first side baffle 12 / second side baffle 13, and this distance is denoted as d5. To reduce pressure loss and also reduce noise, the installation positions of the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15 are restricted as follows: d4 = d5 = L6, where: 0.5L1 ≤ L6 ≤ 0.5L2, L1 is the distance between the first side baffle 12 and the second side baffle 13 in the rectifier section 112; L2 is the maximum opening size of the fume duct 11.

[0082] Therefore, by setting the width of the contact area between the airflow in the sub-channel and the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15, the pressure loss of the oil fume airflow is minimized when it flows within the range hood duct 10, ensuring sufficient air intake. Furthermore, the aforementioned dimensional constraints still satisfy the requirement that the opening width L1 of the rectifying section 112 is less than that of the acceleration section 111 and the expansion section 113. For example, in some embodiments, the first intermediate baffle assembly 14 can be configured as an isosceles triangle with its apex facing the air outlet direction; the second intermediate baffle assembly 15 can be configured as a quadrilateral with one diagonal coinciding with the central axis. It is understood that the specific structures of the first intermediate baffle assembly 14 and the second intermediate baffle assembly 15 are not limited to the shapes described above.

[0083] From a noise perspective, under the premise of ensuring sufficient air intake, the arrangement of each baffle in the range hood duct 10 achieves continuous changes in the cross-section of the fume duct 11, so as to ensure that a reduced sound-absorbing space is formed between two opposing baffles. The sound is reflected and absorbed by each other in the sound-absorbing space, which can effectively reduce the sound intensity inside the frame 21.

[0084] The first side baffle 12, the second side baffle 13, the first intermediate baffle assembly 14, and the second intermediate baffle assembly 15 are all plate assemblies, which can be decomposed into multiple planar plates. One side of each of the above plates is in direct contact with the oil fumes, while the other side is a non-working surface and does not come into contact with the oil fumes. In order to further reduce noise, in some embodiments, at least one of the above plates is a perforated plate 16, and a sound-absorbing layer 17 is provided on the non-working surface of the perforated plate 16. The sound-absorbing layer 17 can be made of foamed sound-absorbing cotton or other porous sound-absorbing materials. The sound-absorbing layer 17 can be glued to the perforated plate 16, or it can be directly foamed on the perforated plate 16. The material, thickness, fixing method, etc. of the sound-absorbing layer 17 are not limited in this application. By setting the baffle as a perforated plate 16, a reduced anechoic space is formed between the two adjacent anechoic surfaces. The sound reflects and absorbs each other in the anechoic space, which can effectively reduce the sound intensity inside the rack 21. In addition, some noise can be absorbed by the sound-absorbing layer 17 after passing through the holes of each baffle, which can effectively absorb some mid-to-high frequency noise.

[0085] The holes in the perforated plate 16 allow noise to pass through and be absorbed by the sound-absorbing layer 17. On the other hand, the holes reduce the weight of the perforated plate 16, correspondingly weakening its structural strength. To balance installation requirements and noise reduction effectiveness, please refer to... Figure 3 In some embodiments, the perforated plate 16 is subject to the following limitations: the perforation rate of the perforated plate 16 is 50% to 80%, that is, the total area of ​​the holes 161 accounts for 50% to 80% of the plate area; the holes 161 on the perforated plate 16 are generally round holes with a diameter D of 2mm ≤ D ≤ 5mm. Of course, in other embodiments, the holes 161 on the perforated plate 16 can also be set to other shapes, such as triangular holes, square holes, elliptical holes, etc., and this application does not impose any limitations.

[0086] Example 2:

[0087] Based on the same inventive concept, this application also provides a range hood 100, such as... Figures 4 to 8The diagram shows the overall structure, exploded view, and internal flow field structure of the range hood 100 under different operating states. The range hood 100 includes a frame assembly 20 and a head assembly 30. The frame assembly 20 has a smoke guide chamber 211, in which a fan 22 is installed. The frame assembly 20 mainly provides support and fixation for the fan 22, which provides suction power. The head assembly 30 is the transition stage after the fumes enter. The head assembly 30 has a smoke intake 341 and the range hood duct 10 of Embodiment 1. The smoke intake 341, the range hood duct 10, and the smoke guide chamber 211 are sequentially connected, and the smoke source... The raw oil fumes enter the range hood duct 10 through the fume inlet 341. The range hood duct 10 accelerates, rectifies, and expands the oil fume airflow before it enters the smoke guiding chamber 211 and is then extracted by the fan 22. After the airflow is accelerated, rectified, and expanded by the range hood duct 10, the flow state inside the head unit 34 is improved, solving problems such as internal cyclones and eddies, and reducing noise. In addition, the accelerated airflow increases the negative pressure of the entire duct, thereby reducing the negative pressure of the fume inlet 341 and improving the smoke extraction effect.

[0088] Therefore, the range hood 100 in this embodiment is a wall-mounted range hood. Compared to the European-style range hood 100 and the near-suction range hood 100, the front and rear dimensions D of the baffle plate of the European-style range hood 100 are too large, which makes it easy for the user's head to bump into the baffle plate during use. See [reference needed]. Figure 9 The experience at position a is poor, and the European-style range hood 100 is too far from the smoke source, failing to remove the fumes quickly enough, causing them to spread easily and resulting in poor smoke extraction. Furthermore, the range hood 100 is prone to collisions with the wok during stir-frying. (See also...) Figure 10 The experience at position b is poor, and the small front-to-back dimensions of the near-suction range hood 100 cause oil fumes to easily spread forward, resulting in poor smoke extraction. The smaller front-to-back dimensions of the wall-mounted range hood head 34 solve the problem of collisions between the wok and the range hood 100 when stir-frying, and the closer proximity of the smoke inlet to the smoke source also addresses the issue of poor smoke extraction. Furthermore, in this embodiment, the range hood 100 has a long duct (large vertical dimension of the range hood duct 10), resulting in a shorter distance between it and the stovetop after installation and better smoke extraction.

[0089] In this range hood 100, the other undetailed structures in the frame assembly 20 and the head assembly 30 can refer to the corresponding structures of existing wall-mounted range hoods, and this application does not limit the specific content.

[0090] Please see Figures 4 to 6In some embodiments, the frame assembly 20 mainly includes a frame 21 and a check valve 23. The frame 21 is a metal shell and serves as the mounting base for the fan 22. A smoke-guiding chamber 211 is formed inside the frame 21, and an exhaust port communicating with the smoke-guiding chamber 211 is provided on the top of the frame 21. The check valve 23 is installed in the exhaust port. The fan 22 is the power source for the range hood 100; see details below. Figure 4 The fan 22 includes a volute 221, a volute support 222, an impeller 223, a motor 224, and an oil nozzle 225. The volute 221 is connected to the frame 21 via the volute support 222 and communicates with a check valve 23. The volute 221 has a main air inlet 226 and a secondary air inlet 227. The impeller 223 is disposed in the volute 221 and is driven to rotate by the motor 224. In specific installation, the main air inlet 226 of the fan 22 is close to the fume extraction port 341, and the secondary air inlet 227 is far from the fume extraction port 341. Generally, the side of the range hood 100 facing the operator is called the front side, and the side away from the operator (or against the wall) is called the rear side. Therefore, the specific installation posture of the fan 22 in the smoke guiding chamber 211 is that the main air inlet 226 is located on the rear side, and the secondary air inlet 227 is located on the front side. Figure 7 As shown. Due to the need to avoid cooking space, the unit head assembly 30 is generally positioned rearward (close to the wall), so that the main air intake 226 is close to the fume extraction port 341 and the secondary air intake 227 is far away from the fume extraction port 341. Most of the fumes can enter through the main air intake 226, and a small portion of the fumes enter the fan 22 through the secondary air intake 227, improving the suction effect. After the fan 22 performs its work, the fumes are discharged through the check valve 23 to prevent backflow. For sealing and aesthetic considerations, a decorative cover 24 can be installed on the outer surface of the frame 21. The shape of the decorative cover 24 is the same as that of the frame 21 so that the decorative cover 24 fits tightly against the frame 21.

[0091] Please see Figures 4 to 6 In some embodiments, the head assembly 30 mainly includes: a head 34, a range hood duct 10, an oil cup assembly 32, a top plate 35, an oil filter 33, and a hinged plate 31. The head 34 is a metal shell and serves as the mounting base for the range hood duct 10. For ease of cleaning and aesthetics, a glass panel 36 can be installed on the outer surface of the head 34. The shape of the glass panel 36 is the same as that of the frame 21, so that the glass panel 36 fits tightly against the frame 21. Specifically, a portion of the housing of the head 34 can be configured as at least one of the following plates: a first side baffle 12, a second side baffle 13, a first cover plate, and a second cover plate of the range hood duct 10, meaning that the range hood duct 10 and the head 34 are at least partially integrated. In other embodiments, the range hood duct 10 can also be configured as an independent component and installed in the head 34 by welding, threaded fasteners, bonding, etc. The specific structure of the range hood duct 10 is described in Embodiment 1 and will not be repeated here.

[0092] The top plate 35 is located on top of the head unit 34 and is used to install the frame assembly 20. Since the top plate 35 is the only structure in the entire range hood 100 that protrudes forward, the control panel of the range hood 100 can be located at the front of the top plate 35 for easy user operation. The fume extraction port 341 is located at the lower part of the head unit 34, close to the smoke source. An oil filter 33 is installed in the fume extraction port 341. The function of the oil filter 33 is to intercept large particles of oil, improving the oil fume filtration effect. The vertical projection of the oil filter 33 falls into the opening of the oil cup assembly 32. The oil cup assembly 32 is located at the bottom of the head unit 34 and is used to collect the oil droplets condensed on the oil filter 33, preventing oil droplets from falling onto the cooktop or into the food, thereby improving the user experience and food safety. A hinged plate 31 is also provided at the lower part of the head 34 and the installation location of the oil filter 33. The hinged plate 31 is rotatably installed on the head 34. By setting the hinged plate 31, which can rotate, the negative pressure zone can be increased by opening the hinged plate 31 during operation to reduce the escape of oil fumes. After the hinged plate 31 is opened, the oil filter 33 is exposed to the outside, filtering and cooling the oil. When the range hood 100 is stopped, the oil filter 33 can be covered by closing the hinged plate 31. Since there is a lot of oil on the oil filter 33, the oil filter 33 can be prevented from being accidentally touched by personnel after the hinged plate 31 is closed.

[0093] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0094] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0095] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0096] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0097] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0098] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0099] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0100] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A range hood, characterized in that, The range hood is a wall-mounted range hood, including: A frame assembly, wherein a smoke guide chamber and a fan are provided in the smoke guide chamber; The assembly includes a fume extraction port and a range hood duct. The range hood duct has a fume channel for fume circulation. The fume extraction port, the range hood duct, and the fume guide chamber are sequentially connected. The range hood duct includes spaced-apart first and second side baffles, spaced-apart and parallel first and second cover plates, and an intermediate guide member located within the fume channel. The first side baffles, second side baffles, first cover plates, and second cover plates together form the fume channel. Along the fume extraction direction, the fume channel consists of an acceleration section, a rectification section, and an expansion section. The cross-sectional area of ​​the rectification section is not greater than that of the acceleration section. The cross-sectional area of ​​the segment and the cross-sectional area of ​​the expansion segment; both the first side baffle and the second side baffle are at least three-segment bent plates, so that different bent segments in the first side baffle and the second side baffle constitute the acceleration segment, the rectification segment and the expansion segment; the intermediate guide includes a first intermediate baffle assembly, which is located in the acceleration segment and / or the rectification segment. The first intermediate baffle assembly is configured to form two sub-channels in the acceleration segment and / or the rectification segment, and can realize the continuous change of the cross-section of the sub-channels, thereby accelerating the airflow velocity, increasing the front negative pressure range, and reducing eddies, cyclones and countercurrents, and reducing noise.

2. The range hood as described in claim 1, characterized in that: Along the direction of oil fume extraction, the cross-sectional area of ​​the acceleration section gradually decreases; along the direction of oil fume extraction, the cross-sectional area of ​​the expansion section gradually increases.

3. The range hood as described in claim 2, characterized in that: The distances between the first side baffle and the second side baffle in the acceleration section, the rectification section and the expansion section are d1, d2 and d3 respectively, where d2≤d1 and d2≤d3.

4. The range hood as described in claim 3, characterized in that: The distance d2 between the first side baffle and the second side baffle in the rectification section is L1; the maximum opening size of the acceleration section and the expansion section are the same and both are L2, and 0.7L2≤L1 <L2。 5. The range hood as described in claim 1, characterized in that: Along the direction of oil fume extraction, the lengths of the acceleration section, the rectification section, and the expansion section are L5, L4, and L3, respectively, where 0.5L5≤L4≤L5, and L5 <L3。 6. The range hood as described in any one of claims 1-5, characterized in that: The intermediate guide member further includes a second intermediate baffle assembly that is spaced apart from the first intermediate baffle assembly along the direction of oil fume absorption; the second intermediate baffle assembly is located in the expansion section.

7. The range hood as described in claim 6, characterized in that: The intermediate guide component divides the fume duct equally; the minimum distance between the first intermediate baffle assembly and the first side baffle / second side baffle is d4, and the distance between the air inlet end of the second intermediate baffle assembly and the first side baffle / second side baffle is d5, d4=d5=L6, where: 0.5L1≤L6≤0.5L2, L1 is the distance between the first side baffle and the second side baffle in the rectification section; L2 is the maximum opening size of the fume duct.

8. The range hood as described in claim 7, characterized in that: At least one of the first side baffle, the second side baffle, the first intermediate baffle assembly, and the second intermediate baffle assembly is a perforated plate; a sound-absorbing layer is provided on the side of the perforated plate that does not come into contact with the oil fumes.

9. The range hood as described in claim 8, characterized in that: The aperture D of the holes on the perforated plate is 2mm≤D≤5mm; the opening rate of the perforated plate is 50%~80%.

10. The range hood as described in any one of claims 1-5, characterized in that, The rack assembly also includes: The frame has an exhaust port on its top and a smoke guide chamber formed inside the frame. The fan is installed in the smoke guide chamber with its main air inlet close to the exhaust port and its secondary air inlet away from the exhaust port. A decorative cover is provided on the outer surface of the frame; In addition, a check valve is installed in the exhaust port, and the exhaust port of the fan is connected to the check valve.

11. The range hood as described in any one of claims 1-5, characterized in that, The head assembly also includes: The range hood duct is located in the head unit, and the fume extraction port is located at the lower part of the head unit; An oil cup is provided and located at the bottom of the machine head; A top plate is disposed on the top of the machine head; A glass panel covers the outer surface of the machine head; An oil filter is installed in the fume extraction port, and the vertical projection of the oil filter falls into the opening formed by the oil cup; The opening and closing plate is rotatably disposed at the lower part of the machine head, and when the opening and closing plate rotates, the oil screen is covered or exposed by the opening and closing plate.

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