Range hood

Abstract

The utility model discloses a range hood which comprises a rack assembly and a fan assembly, and an oil smoke suction port is formed in the bottom of the rack assembly; the fan assembly is arranged in the rack assembly, the fan assembly is provided with a main air suction port and an auxiliary air suction port which are communicated with the oil smoke suction port, and an air outlet which is communicated with the main air suction port and the auxiliary air suction port, the main air suction port is arranged towards the rear side of the rack assembly, and the auxiliary air suction port is arranged towards the rear side of the rack assembly. The auxiliary exhaust inlet is arranged towards the front side of the rack assembly, and the air outlet is arranged towards the top side of the rack assembly; wherein the center O of the main exhaust inlet and the center P of the auxiliary exhaust inlet do not coincide with each other, and the overall noise of the range hood can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a range hood. Background Art

[0002] As modern families pursue a higher quality of life, range hoods have become an indispensable appliance in the kitchen. The main function of a range hood is to exhaust the fumes, odors, and steam generated during cooking to the outside, keeping the kitchen clean and hygienic.

[0003] Range hoods typically consist of a frame assembly and a smoke collection assembly. The frame assembly supports the fan, while the smoke collection assembly collects and directs oil smoke into the fan chamber. However, when the fan rotates at high speed, the friction between the blades and the air generates airflow noise. This noise is concentrated inside the range hood and radiates outwards, resulting in a relatively loud overall noise level. Utility Model Content

[0004] An embodiment of the present application provides a range hood that can reduce the overall noise of the range hood.

[0005] An embodiment of the present application provides a range hood, comprising a frame assembly and a fan assembly, wherein a range hood is provided at the bottom of the frame assembly; the fan assembly is arranged inside the frame assembly, and the fan assembly is provided with a main air intake port and an auxiliary air intake port connected to the range hood, and an air outlet connected to the main air intake port and the auxiliary air intake port, wherein the main air intake port is arranged toward the rear side of the frame assembly, the auxiliary air intake port is arranged toward the front side of the frame assembly, and the air outlet is arranged toward the upper side of the frame assembly; wherein the centers O of the main air intake port and the auxiliary air intake port do not overlap with the center P of the frame assembly.

[0006] In some embodiments, the center O of the main air inlet and the auxiliary air inlet is located to the right of the center P of the rack assembly;

[0007] And / or, the center O of the main air suction port and the auxiliary air suction port is located above the center P of the rack assembly.

[0008] In some embodiments, the dimension of the rack assembly in the left-right direction is defined as W, and the dimension in the up-down direction is defined as L. The center O of the main air inlet and the auxiliary air inlet is located to the upper right of the center P of the rack assembly. The vertical distance between the center O of the main air inlet and the center O of the auxiliary air inlet and the center P of the rack assembly is defined as L1. The horizontal distance between the center O of the main air inlet and the center O of the auxiliary air inlet and the center P of the rack assembly is defined as W1.

[0009] Among them, 0< ≤0.25; 0< ≤0.25L.

[0010] In some embodiments, the W value is not less than 300 mm and not more than 800 mm; the L value is not less than 100 mm and not more than 500 mm.

[0011] In some embodiments, the rack assembly includes a front side panel and a rear side panel, and a distance h1 between the main air suction port and the rear side panel is greater than a distance h2 between the auxiliary air suction port and the front side panel.

[0012] In some embodiments, the thickness of the frame assembly is defined as H;

[0013] Among them, 0.1≤ ≤0.5; 0.1≤ ≤0.5.

[0014] In some embodiments, the H value is not less than 100 mm and not more than 500 mm.

[0015] In some embodiments, a smoke collecting assembly is further included, the smoke collecting assembly being disposed below the rack assembly and including a smoke collecting hood and a condensing plate, the condensing plate including a first plate body and a second plate body connected to each other, the first plate body and the second plate body being disposed at an angle;

[0016] The first plate body is connected to the front side of the smoke collecting hood and is provided with a first smoke inlet connected to the oil smoke suction port. The second plate body and the back plate of the smoke collecting hood jointly define a second smoke inlet connected to the oil smoke suction port. In the front-to-back direction of the range hood, the first smoke inlet is located in front of the second smoke inlet, and the flow cross-sectional area of ​​the first smoke inlet is smaller than the flow cross-sectional area of ​​the second smoke inlet.

[0017] In some embodiments, the smoke hood is provided with an oil collecting cup and a guide plate. Along the front-to-back direction of the range hood, the guide plate is tilted downward from back to front and is located in the notch of the oil collecting cup.

[0018] In some embodiments, the fan assembly includes a multi-blade centrifugal wind wheel. When viewed from the front side, the multi-blade centrifugal wind wheel rotates clockwise, and the blades of the multi-blade centrifugal wind wheel are forward blades.

[0019] In some embodiments, a check valve is further included, which is used to prevent smoke backflow. The check valve is installed at the air outlet, and a center line E of the air inlet of the check valve extending in the vertical direction is located to the left of a center line F of the center line of the frame assembly extending in the vertical direction.

[0020] In some embodiments, the dimension of the rack assembly in the left-right direction is defined as W;

[0021] The distance between the center line E of the air inlet of the check valve extending in the vertical direction and the center line F of the frame assembly extending in the vertical direction is W2;

[0022] Among them, 0.1≤ ≤0.5.

[0023] In some embodiments, the fan assembly includes a volute and a wind wheel, the wind wheel is installed in the volute, and the left side, right side and upper side of the volute are all in contact with the inner wall surface of the frame assembly.

[0024] In some embodiments, the fan assembly also includes an oil guide assembly, the wind wheel is installed in the volute, a guide hole is provided at the bottom of the volute, the oil guide assembly is fixed to the volute and connected to the guide hole, and the oil guide assembly is used to discharge the oil smoke in the volute to the outside.

[0025] In some embodiments, the oil guide assembly includes a guide pipe and a mounting member, the frame assembly includes a rear side plate, the mounting member connects the volute and the rear side plate, the guide pipe is connected to the guide hole and supported on the mounting member, and an oil leakage hole is provided at one end of the mounting member close to the rear side plate, and is used to guide the smoke oil guided out of the guide pipe to the oil leakage hole.

[0026] In some embodiments, the fan assembly further includes a mounting bearing, the main air inlet and the auxiliary air inlet are respectively provided on opposite sides of the volute in the front-to-back direction, the mounting bearing is fixedly connected to the volute, and is used to fix the impeller in the volute;

[0027] Among them, the air suction port on the side where the mounting bearing is installed is the auxiliary air suction port, and the air suction port on the side away from the mounting bearing is the main air suction port.

[0028] In the present application, the combined use of the main air intake and the auxiliary air intake can significantly increase the suction area and air volume of the range hood, thereby more effectively absorbing oil fumes. The main air intake is set toward the rear side of the frame assembly, and is mainly used to absorb oil fumes on the rear side. Most of the oil fumes generated during the cooking process are collected before reaching the user's head, reducing direct contact between the oil fumes and the user and improving cooking comfort. The auxiliary air intake is set toward the front side of the frame assembly, which can further inhale oil fumes that diffuse during the cooking process. The main air intake of the present application generates a large negative pressure on one side inside the frame assembly, and the setting of the auxiliary air intake can effectively inhale the airflow on the front side, thereby adjusting the front-to-back air pressure difference. Compared with only one air intake, the negative pressure inside the range hood is too concentrated, resulting in uneven air pressure distribution inside the range hood. The present application can reduce airflow turbulence and vortex phenomena, make the airflow distribution more uniform, and improve the efficiency of oil fume exhaust.

[0029] Further explaining, the volute of the present application can abut against the inner wall of the frame assembly. Specifically, the left side of the volute abuts against the inner wall of the left side panel, the right side of the volute abuts against the inner wall of the right side panel, and the top side of the volute abuts against the inner wall of the top side panel. This ensures that the center O of the air intake does not overlap with the center P of the frame assembly. This allows for a smaller frame assembly to accommodate a wider range of kitchen layouts and meet the needs of different users. Furthermore, the close abutment between the volute and the frame assembly enhances the stability of the overall structure and reduces vibration and noise during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 A schematic structural diagram of a range hood provided in an embodiment of the present application;

[0032] Figure 2 A schematic cross-sectional view of a range hood provided in an embodiment of the present application;

[0033] Figure 3 A schematic structural diagram of a rack assembly and a fan assembly provided in an embodiment of the present application (the front side panels are omitted);

[0034] Figure 4 A schematic structural diagram of a rack assembly and a fan assembly provided in an embodiment of the present application from another perspective;

[0035] Figure 5 A schematic structural diagram of a fan assembly provided in an embodiment of the present application;

[0036] Figure 6 A schematic structural diagram of a fan assembly provided in an embodiment of the present application from another perspective;

[0037] Figure 7 A schematic structural diagram of an oil guide assembly provided in an embodiment of the present application.

[0038] Description of Figure Numbers:

[0039] 1. Range hood; 100. Frame assembly; 100a. Range hood intake; 100b. Fan chamber; 110. Front side panel; 120. Rear side panel; 130. Top side panel; 200. Fan assembly; 200a. Main air intake; 200b. Auxiliary air intake; 200c. Air outlet; 210. Volute; 220. Impeller; 230. Bearing installation; 300. Smoke collection assembly; 300a, first smoking port; 300b, second smoking port; 310, smoke hood; 311, back panel; 320, condensation plate; 321, first plate body; 322, second plate body; 330, guide plate; 340, oil collecting cup; 400, check valve; 400a, air inlet; 500, oil guide assembly; 510, guide pipe; 520, mounting part; 520a, oil leakage hole.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following part will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0042] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention, as detailed in the appended claims.

[0043] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] The embodiment of the present application proposes a range hood 1, which can be used in a kitchen and is usually installed near the surface of a stove to better capture the fumes and steam generated by cooking utensils during the cooking process.

[0046] See also Figure 1 The range hood 1 includes a frame assembly 100, a smoke collecting assembly 300 and a fan assembly 200. The smoke collecting assembly 300 can be installed below the frame assembly 100, close to the cooking area, and its main function is to collect and guide the oil smoke generated during the cooking process. Figure 4 The rack assembly 100 has a fan cavity 100b, and the fan assembly 200 is arranged in the fan cavity 100b. The fan assembly 200 generates a strong negative pressure suction force through rotation, which quickly sucks in the oil smoke collected by the smoke collection assembly 300 and accelerates it to be discharged to the outside through the air duct, reducing the concentration of oil smoke in the kitchen and keeping the kitchen air fresh.

[0047] Please refer to Figure 4The frame assembly 100 is provided with an oil smoke intake port 100a, through which oil smoke enters the air duct inside the frame assembly 100 and continues to flow along the air duct until it reaches the fan assembly 200. The frame assembly 100 can be in the shape of a cube. This design not only gives the product a regular and elegant appearance, but also maximizes the utilization of its internal space and facilitates docking and installation with other components such as the smoke collection assembly 300 and the fan assembly 200. The frame assembly 100 can include a front side panel 110, a rear side panel 120, a left side panel, a right side panel, a top side panel 130, and a bottom side panel. These panels are assembled into one piece by welding, bolting, or other means to form a well-sealed fan chamber 100b. The bottom side panel is provided with the above-mentioned oil smoke intake port 100a.

[0048] It should be noted that the front side panel 110, the rear side panel 120, the left side panel, the right side panel, the top side panel 130 and the bottom side panel can exist as separate panels; or, depending on the actual situation, some of the panels can be integrally molded to form a cover. For example, the rear side panel 120, the left side panel and the right side panel of the present application are an integrated structure, so that the installation of the three panels can be completed at one time, greatly improving the installation efficiency. At the same time, this one-piece design also reduces the number of joints between the panels, reduces the risk of oil fume leakage, and improves the sealing performance of the product. The above-mentioned panels can be made of stainless steel or aluminum alloy, which has good heat resistance and corrosion resistance.

[0049] The fan assembly 200 is provided with an air intake connected to the oil fume intake port. The negative pressure suction generated by the fan assembly 200 during operation can draw external oil fume from the oil fume intake port 100a into the fan chamber 100b. The air intake then enters the fan assembly 200 through the air intake port. The air is then propelled by the airflow generated by the rotation of the fan assembly 200 and directed toward the oil fume exhaust duct for discharge outdoors, thereby maintaining fresh kitchen air and the health of the cook. The air intake in this embodiment of the present application includes a main air intake 200a and an auxiliary air intake 200b. This significantly increases the range hood's suction area and air volume, thereby more effectively absorbing oil fume. The main air intake 200a is positioned toward the rear of the frame assembly 100, while the auxiliary air intake 200b is positioned toward the front of the frame assembly 100.

[0050] See also Figure 2 The fan assembly 200 includes a volute 210 and a wind wheel 220. The volute 210 is provided with the main air inlet 200a and the auxiliary air inlet 200b as mentioned above, and is also provided with an air outlet 200c. Figure 3, the center O of the main air intake 200a and the center O of the auxiliary air intake 200b do not coincide with the center P of the frame assembly 100. The center of the air intake of the present application can be the axis of the wind wheel 220, which is beneficial to reduce the wind resistance of the suction system and is beneficial to the gathering of oil smoke by the air intake. The wind wheel 220 is installed in the volute 210. In order to form an effective airflow profile in the volute 210, the center of the wind wheel 220 usually does not completely coincide with the center of the volute 210. This design is based on the principles of fluid mechanics. By adjusting the relative position between the wind wheel 220 and the volute 210, the airflow can be guided to flow along a predetermined path, forming a gradually expanding trend. The gradually expanding airflow profile means that the airflow gradually diffuses in the volute 210, reducing the flow rate of the airflow and increasing its static pressure. Therefore, the wind wheel 220 naturally has a certain offset in the volute 210 , and the present application matches the offset position of the wind wheel 220 in the volute 210 with the offset position of the frame assembly 100 , which is beneficial to the miniaturization design of the frame assembly 100 .

[0051] Specifically, the volute 210 of the present application can abut against the inner wall surface of the frame assembly 100. The left side of the volute 210 abuts against the inner wall surface of the left side panel, the right side of the volute 210 abuts against the inner wall surface of the right side panel, and the upper side of the volute 210 abuts against the inner wall surface of the top side panel 130. In this way, the length (left-right direction) and height (up-down direction) of the frame assembly 100 are set to correspond to the dimensions of the volute 210. At this time, the axis of the impeller 220 naturally does not coincide with the center P of the frame assembly 100. This ensures that the airflow profile formed by the impeller 220 in the volute 210 meets the air volume, and the size of the frame assembly 100 can be set smaller. This is very useful in situations where kitchen space is limited, and the compact range hood 1 can adapt to more kitchen layouts and meet the needs of different users.

[0052] In some embodiments, see Figure 3 The wind wheel 220 is a multi-blade centrifugal wind wheel 220 that rotates clockwise, and the blades of the multi-blade centrifugal wind wheel 220 are forward-pointing blades. In a multi-blade centrifugal fan or other rotary fluid machinery, a forward-pointing blade (also known as a forward-curved blade or a forward-swept blade) refers to a blade whose tilt direction, relative to the direction of rotation, causes its leading edge to be closer to the air intake of the wind wheel 220, while its trailing edge is closer to the air outlet 200c of the wind wheel 220. In other words, the tilt angle of the forward-pointing blade (i.e., the angle between the blade chord and the plane of rotation of the blade) enables the blade to "push" or "pull" the air forward as it rotates, thereby accelerating the airflow along the direction of rotation of the blade and the direction of air discharge.

[0053] In this application, the blades of the multi-blade centrifugal impeller 220 are oriented in the same direction as the rotation, enabling more efficient axial introduction and acceleration of gas as the impeller rotates. During this process, as the impeller 220 rotates, the blades exert a tangential force on the gas, causing the gas to gain angular momentum and begin to accelerate along the curvature of the blades. The accelerated gas enters the volute 210, the shape of which is designed to gradually decelerate the gas during flow. According to Bernoulli's principle, when gas velocity decreases, its pressure increases accordingly. This means that the accelerated gas decelerates in the volute 210 and is converted into pressure energy, helping to increase the fan's air volume and pressure at the same power. Because the blades are oriented in the same direction as the rotation, the airflow over the blades is smoother, effectively suppressing eddies and turbulence. This not only reduces energy loss but also enables the fan to output a higher air volume and pressure at the same power. It also reduces eddies and turbulence, thereby reducing the noise of the fan assembly 200.

[0054] The center O of the main air inlet 200a and the center O of the auxiliary air inlet 200b are located to the right of the center P of the frame assembly 100; or the center O of the main air inlet 200a and the center O of the auxiliary air inlet 200b are located above the center P of the frame assembly 100; or the center O of the main air inlet 200a and the center O of the auxiliary air inlet 200b are located to the upper right of the center P of the frame assembly 100. Because the blades described above are forward-facing blades and rotate clockwise, the axis of the impeller 220 within the volute 210 will be offset to the right, and the center O of the main air inlet 200a and the center O of the auxiliary air inlet 200b will be located to the right of the center P of the frame assembly 100.

[0055] Specifically, the left side of the volute 210 abuts the inner wall of the left side panel, the right side of the volute 210 abuts the inner wall of the right side panel, and the top side of the volute 210 abuts the inner wall of the top side panel 130. This way, the center O of the air intake port is located to the right of the center P of the frame assembly 100, while a certain amount of space is left at the bottom of the volute 210 to accommodate other components (such as the oil guide assembly 500 or other components that drain the liquid from the volute 210). This way, the center O of the air intake port is located to the upper right of the center P of the frame assembly 100. The close abutment between the volute 210 and the frame assembly 100 in this application enhances the stability of the overall structure, reduces vibration and noise during operation, and allows the frame assembly 100 to be smaller in size.

[0056] In this application, due to the specific abutment between the volute 210 and the frame assembly 100, the center O of the air intake is naturally positioned to the upper right of the center P of the frame assembly 100. This layout allows the air intake to be positioned away from the cook's head during use, reducing the direct impact of noise and fumes on the cook. Furthermore, thanks to the compact design of the volute 210 and the rational use of space, it should be noted that the fan assembly 200 generally also includes a mounting bearing 230, which is fixed relative to the volute 210, and the impeller 220 is then mounted on the mounting bearing 230. It can be understood that openings connecting to the inner cavity will be provided at the front and rear of the volute 210 to form an air suction port, and the mounting bearing 230 will usually be installed on one side of the volute 210 and will block at least part of the air suction port on that side, resulting in the area of ​​one air suction port on the front and rear sides of the volute 210 being relatively larger (i.e., the main air suction port 200a), while the area of ​​the other air suction port being relatively smaller (i.e., the auxiliary air suction port 200b).

[0057] It is understandable that the range hood 1 will generate a certain negative pressure when working to attract oil smoke and air to enter. However, if only one air suction port is set, the negative pressure inside the range hood 1 may be too concentrated, resulting in uneven air pressure distribution inside the range hood. This imbalance in air pressure difference will not only affect the suction effect of oil smoke, but may also cause air flow turbulence and vortex phenomena, thereby generating noise. The present application sets a main air suction port 200a and an auxiliary air suction port 200b, which can increase the air volume and thus increase the emission efficiency of oil smoke, and can also adjust the front and rear air pressure difference, reduce air flow turbulence and vortex phenomena, make the air flow distribution more uniform, and reduce the generation of noise.

[0058] See also Figure 4 , the distance h1 between the main air intake 200a and the front side panel 110 is greater than the distance h2 between the auxiliary air intake 200b and the rear side panel 120. Since the main air intake 200a has a larger area, its suction force is also stronger. The larger h1 distance helps to form a more stable airflow field at the main air intake 200a. When oil smoke or air is inhaled, the larger distance can reduce the direct collision between the airflow and the side panel, thereby reducing the occurrence of vortex and turbulence. The stable airflow field helps to improve the suction efficiency and reduce noise and vibration. However, the area of ​​the auxiliary air intake 200b is smaller than that of the main air intake 200a, so the suction force is not as strong as that of the main air intake 200a. The smaller h2 distance may help to enhance the suction force of the auxiliary air intake 200b. Due to the closer distance, the rear side panel 120 may have a certain guiding effect on the airflow passing through the auxiliary air intake 200b, making it easier for the airflow to be inhaled and accelerated through the volute 210.

[0059] See also Figure 4 , define the front-to-back dimension of the rack assembly 100 as H; where 0.1≤ ≤0.5; 0.1≤ ≤0.5. The present application further provides that the ratio of the air volume inhaled by the main air intake port 200a to the air volume inhaled by the auxiliary air intake port 200b is in the range of 9:1~7:3. Within this ratio range, the main air intake port 200a serves as the main air flow inlet, and its larger air volume can ensure the formation of a stable air pressure gradient inside the range hood 1. Although the auxiliary air intake port 200b has a smaller air volume, it plays a role in supplementing and balancing the air flow, making the overall air pressure distribution more uniform. Uniform air flow distribution can reduce the occurrence of vortexes and turbulence. Vortexes and turbulence will not only reduce the suction efficiency, but also increase noise and vibration. Through reasonable air volume distribution, the air flow can pass through the volute 210 and the wind wheel 220 more smoothly, reducing unnecessary energy loss. The 0.1≤ ≤0.5; 0.1≤ ≤0.5, which can facilitate controlling the ratio of the air volume inhaled by the main suction port 200a to the air volume inhaled by the auxiliary suction port 200b in the range of 9:1~7:3. It should be noted that the suction area of ​​the main suction port 200a is different from the suction area of ​​the auxiliary suction port 200b. Therefore, technical personnel in this field can set the specific values ​​of h1, h2 and H according to the air volume ratio of the main suction port 200a and the auxiliary suction port 200b provided in this application and the proportional relationship of h1, h2 and H provided in this application.

[0060] In some embodiments, see Figure 3 , define the size of the rack assembly 100 in the left-right direction as W, and the size in the up-down direction as L; define the vertical distance between the center O of the air inlet and the center P of the rack assembly 100 as L1, and the horizontal distance between the center O of the air inlet and the center P of the rack assembly 100 as W1; where 0 < ≤0.25; 0< ≤0.25L.

[0061] 0< ≤0.25 This ratio limits the offset of the center O of the air inlet in the width direction of the rack assembly 100; 0< The ratio of ≤0.25 limits the offset of the center O of the air intake port in the height direction of the frame assembly 100. Specifically, when using a volute 210 of the same specifications and the inner wall surface of the volute 210 and the inner wall surface of the frame assembly 100 abut each other, if the offset between the center O of the air intake port and the center P of the frame assembly 100 is too large, the position of the axis of the impeller 220 in the volute 210 will also be offset accordingly. This offset will change the initial direction and speed of the airflow entering the volute 210, thereby destroying the originally designed airflow profile. The airflow profile refers to the flow path and shape of the airflow in the volute 210. When the center of the air intake port deviates too much from the center of the frame assembly 100 (and deviates within the volute 210), the airflow will form unstable vortices or turbulence after entering the volute 210, resulting in air volume loss and increased noise.

[0062] If, however, the axis of the impeller 220 is set at a constant distance within the volute 210, and the volute 210 is offset as a whole, such that the center of the air intake port is significantly offset from the center P of the frame assembly 100, the relative position between the volute 210 and the frame assembly 100 will change. Therefore, the frame assembly 100 will need to be larger to accommodate the offset fan assembly 200, thus requiring a larger installation space for the range hood 1.

[0063] In some embodiments, a diversion hole is provided at the bottom of the volute 210. This diversion hole ensures that the oil smoke within the volute 210 can be discharged smoothly, preventing accumulation within the volute 210. The diversion hole is typically located at the lowest point of the volute 210. Due to the principle of gravity, the oil in the oil smoke can naturally settle at the bottom of the volute 210 and then be discharged through the diversion hole. The oil guide assembly 500 is fixed to the volute 210 and communicates with the diversion hole. The oil guide assembly 500 is used to guide the oil smoke within the volute 210 to a position where it can be discharged externally.

[0064] Please return to Figure 1 and Figure 7 The oil guide assembly 500 includes a guide tube 510 and a mounting member 520. The mounting member 520 connects the volute 210 and the rear side plate 120. The guide tube 510 is connected to the guide hole and supported on the mounting member 520. The mounting member 520 is provided with an oil leakage hole 520a at one end close to the rear side plate 120, and is used to guide the smoke oil guided out of the guide tube 510 to the oil leakage hole 520a. The present application installs the guide tube 510 at the guide hole, which can guide the smoke oil to be discharged along a predetermined path. In addition, the guide tube 510 can play a certain degree of isolation role, reducing the direct transmission of noise generated when the wind wheel 220 is in operation. Of course, the guide tube 510 can also be made of a material with sound-absorbing or sound-insulating properties to further reduce the spread of noise.

[0065] In the range hood 1 described above and below, the frame assembly 100 has a left-right dimension (i.e., length) of no less than 300 mm and no greater than 800 mm; a vertical dimension (i.e., height) of no less than 300 mm and no greater than 800 mm; and a front-to-back dimension (i.e., thickness) of no less than 100 mm and no greater than 500 mm. The range hood 1 provided in this application simultaneously achieves the advantages of high airflow, excellent quietness, and a compact size. It can more quickly absorb and exhaust fumes and odors generated during cooking, ensuring fresh kitchen air, while also producing no harsh noise during use, providing a more comfortable and quiet cooking environment for the cook. It is also suitable for kitchens with limited space, such as small apartments or condominiums.

[0066] See also Figure 3 The range hood 1 also includes a check valve 400, which is installed at the air outlet 200c and is located to the left of the center line of the frame assembly 100 extending in the vertical direction. The check valve 400 is used to prevent smoke from flowing back. Continuing with the above description, since the air intake of the present application is biased toward the right side of the frame assembly 100, the air outlet 200c of the fan assembly 200 will be biased toward the left side of the frame assembly 100, and thus the check valve 400 of the present application will be biased toward the left side. The main function of the check valve 400 is to prevent smoke from flowing back into the system or the room after the flow stops. When the fan stops working or the direction of smoke flow changes, the check valve 400 will automatically close to ensure that the smoke does not flow back.

[0067] The horizontal distance between the center line E of the air inlet 400a of the check valve 400 extending in the vertical direction and the center line F of the frame assembly 100 extending in the vertical direction is W2; wherein, 0.1≤ ≤0.5. This arrangement ensures that the airflow from the volute 210 can flow along the original airflow direction to the check valve 400 and then enter the exhaust pipe. If the value is less than 0.1 or greater than 0.5, the airflow will be partially obstructed when flowing to the check valve 400, changing the airflow direction and easily generating eddies and turbulence, resulting in lower airflow efficiency and noise. When it is greater than 0.5, it also means that the distance between the center line E extending in the vertical direction between the fan assembly 200 and the air inlet 400a of the check valve 400 is larger, and the distance the airflow flows from the wind wheel 220 to the check valve 400 is longer, which easily increases the flow resistance, resulting in a slower airflow speed and reduced flow efficiency.

[0068] See also Figure 1 and Figure 2The smoke collection assembly 300 includes a smoke hood 310 and a condenser plate 320. The condenser plate 320 includes a first plate 321 and a second plate 322 connected to each other, with the first plate 321 and the second plate 322 arranged at an angle. A smoke intake port 100a is provided at the bottom of the frame assembly 100. The first plate 321 is connected to the front side of the smoke hood 310 and is provided with a first smoke outlet 300a that communicates with the smoke intake port 100a. The second plate 322 and the back plate 311 of the smoke hood 310 together define a second smoke outlet 300b that communicates with the smoke intake port 100a. In the front-to-back direction of the range hood 1, the first smoke outlet 300a is located in front of the second smoke outlet 300b, and the flow cross-sectional area of ​​the first smoke outlet 300a is smaller than the flow cross-sectional area of ​​the second smoke outlet 300b.

[0069] See also Figure 7 The first plate 321 is connected to the front side of the smoke collection hood 310 and is tilted downward from front to back in the front-to-back direction. One end of the second plate 322 is connected to one end of the lowest point of the first plate 321. The second plate 322 is also tilted downward from front to back in the front-to-back direction. Based on this, the opening height of the second smoke outlet 300b will be lower than the opening height of the first smoke outlet 300a. At the same time, the flow cross-sectional area of ​​the second smoke outlet 300b is larger than the flow cross-sectional area of ​​the first smoke outlet 300a. That is to say, the intensity of the oil smoke absorption of the second smoke outlet 300b is greater than the intensity of the oil smoke absorption of the first smoke outlet 300a. Therefore, most of the oil smoke generated during the cooking process will enter the internal air duct of the frame assembly 100 through the first smoke outlet 300a. During cooking, the distance between the second smoke outlet 300b and the user is greater than the distance between the first smoke outlet 300a and the user. The first smoke outlet 300a is generally located on the top of the user, while the second smoke outlet 300b is generally located in front of the user. Most of the oil smoke is collected before it reaches the user's head, reducing direct contact between the oil smoke and the user and improving cooking comfort. Furthermore, the distance between the second smoke outlet 300b and the user is greater, so the noise generated has a relatively small impact on the user. Although the first smoke outlet 300a is located near the user's head, its suction is weaker and it mainly captures oil smoke that has already moved away from the source of the oil smoke, so the noise generated is relatively small.

[0070] See also Figure 2The smoke hood 310 is provided with an oil collecting cup 340 and a guide plate 330. The guide plate 330 is arranged to be tilted downward from the back to the front along the front-to-back direction of the range hood 1 and is located in the groove of the oil collecting cup 340. The smoke collecting assembly 300 also includes a mounting bracket, which is fixedly connected to the smoke hood 310 and on which the guide plate 330 is mounted. The guide plate 330 is used to guide the oil smoke to flow along a specific path to improve the efficiency of the oil smoke entering the second smoke outlet 300b. At the same time, the oil smoke with higher temperature is easy to form oil droplets when it contacts the guide plate 330 with lower temperature. The oil droplets can slide smoothly into the oil collecting cup 340 under the combined action of gravity and the guide plate 330, thereby reducing the accumulation and dripping of oil droplets in the smoke hood 310. The oil collecting cup 340 can be detachably mounted on the hood body. The user can regularly clean the oil droplets in the oil collecting cup 340 to keep the range hood 1 clean and in an efficient working state.

[0071] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A range hood, characterized in that: include: The rack assembly is provided with a fume extraction port at the bottom; as well as a fan assembly disposed in the frame assembly, the fan assembly being provided with a main air intake and an auxiliary air intake connected to the range fumes intake port, and an air outlet connected to the main air intake and the auxiliary air intake, the main air intake being arranged toward the rear side of the frame assembly, the auxiliary air intake being arranged toward the front side of the frame assembly, and the air outlet being arranged toward the top side of the frame assembly; The centers O of the main air suction port and the auxiliary air suction port do not coincide with the center P of the rack assembly.

2. The range hood according to claim 1, wherein: The center O of the main air inlet and the auxiliary air inlet is located to the right of the center P of the rack assembly; And / or, the center O of the main air suction port and the auxiliary air suction port is located above the center P of the rack assembly.

3. The range hood according to claim 2, wherein: The left-right dimension of the rack assembly is defined as W, and the up-down dimension is defined as L. The center O of the main air inlet and the auxiliary air inlet is located to the upper right of the center P of the rack assembly. The vertical distance between the center O of the main air inlet and the auxiliary air inlet and the center P of the rack assembly is defined as L1. The horizontal distance between the center O of the main air inlet and the auxiliary air inlet and the center P of the rack assembly is defined as W1. Among them, 0< ≤0.25; 0< ≤0.25L.

4. The range hood according to claim 3, wherein: The W value is not less than 300 mm and not more than 800 mm; the L value is not less than 100 mm and not more than 500 mm.

5. The range hood according to claim 1, wherein: The frame assembly includes a front side panel and a rear side panel, and a distance h1 between the main air suction port and the rear side panel is greater than a distance h2 between the auxiliary air suction port and the front side panel.

6. The range hood according to claim 5, wherein: Define the thickness of the frame assembly is H; Among them, 0.1≤ ≤0.5; 0.1≤ ≤0.

5.

7. The range hood according to claim 6, wherein: The H value is not less than 100 mm and not more than 500 mm.

8. The range hood according to claim 5, wherein: The machine also includes a smoke collection assembly, which is arranged below the frame assembly and includes a smoke collection hood and a condensing plate. The condensing plate includes a first plate body and a second plate body connected to each other, and the first plate body and the second plate body are arranged at an angle. The first plate body is connected to the front side of the smoke collecting hood and is provided with a first smoke inlet connected to the oil smoke suction port. The second plate body and the back plate of the smoke collecting hood jointly define a second smoke inlet connected to the oil smoke suction port. In the front-to-back direction of the range hood, the first smoke inlet is located in front of the second smoke inlet, and the flow cross-sectional area of ​​the first smoke inlet is smaller than the flow cross-sectional area of ​​the second smoke inlet.

9. The range hood according to claim 8, wherein: The smoke collecting hood is provided with an oil collecting cup and a guide plate. Along the front-to-back direction of the range hood, the guide plate is arranged to tilt downward from the back to the front and is located in the notch of the oil collecting cup.

10. The range hood according to claim 1, wherein: The fan assembly includes a multi-blade centrifugal fan wheel, which rotates clockwise when viewed from the front of the range hood, and the fan blades of the multi-blade centrifugal fan wheel are forward blades.

11. The range hood according to any one of claims 1 to 10, characterized in that: A check valve is also included to prevent smoke backflow. The check valve is installed at the air outlet, and a center line E of the air inlet of the check valve extending in the vertical direction is located to the left of a center line F of the frame assembly extending in the vertical direction.

12. The range hood according to claim 11, wherein: The left-right dimension of the rack assembly is defined as W. The distance between the center line E of the air inlet of the check valve extending in the vertical direction and the center line F of the frame assembly extending in the vertical direction is W2; Among them, 0.1≤ ≤0.

5.

13. The range hood according to any one of claims 1 to 10, characterized in that: The fan assembly includes a volute and a wind wheel. The wind wheel is installed in the volute. The left side, the right side and the upper side of the volute are all in contact with the inner wall surface of the frame assembly.

14. The range hood according to claim 13, wherein: The fan assembly also includes an oil guide assembly. A guide hole is provided at the bottom of the volute. The oil guide assembly is fixed to the volute and communicated with the guide hole. The oil guide assembly is used to discharge the oil smoke in the volute to the outside.

15. The range hood according to claim 14, wherein: The oil guide assembly includes a guide pipe and a mounting member, the frame assembly includes a rear side plate, the mounting member connects the volute and the rear side plate, the guide pipe is connected to the guide hole and supported on the mounting member, and an oil leakage hole is provided at one end of the mounting member close to the rear side plate, and is used to guide the smoke oil guided out of the guide pipe to the oil leakage hole.

16. The range hood according to claim 13, wherein: The fan assembly further includes a mounting bearing, the main air inlet and the auxiliary air inlet are respectively provided on opposite sides of the volute in the front-to-back direction, the mounting bearing is fixedly connected to the volute and fixes the wind wheel in the volute; Among them, the air suction port on the side where the mounting bearing is installed is the auxiliary air suction port, and the air suction port on the side away from the mounting bearing is the main air suction port.

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