Range hood

Abstract

The utility model discloses a range hood which comprises a rack assembly, a fan assembly and a check valve, and a smoke suction opening is formed in the bottom of the rack assembly; the fan assembly is arranged in the rack assembly, the fan assembly is provided with an air suction port communicated with the smoke suction port and an air outlet communicated with the air suction port, and the air outlet faces the top of the rack assembly; at least part of the check valve extends into the rack assembly and communicates with the air outlet, the center line E of the check valve is located on the left side of the center line F of the rack assembly, and the check valve is used for preventing smoke from flowing back; the size of the rack assembly in the left-right direction is defined as W, the left-right distance between the center line E of the check valve and the center line F of the rack assembly is W2, 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] The embodiment of the present application provides a range hood, comprising a frame assembly, a fan assembly and a check valve, wherein a smoke suction port is provided at the bottom of the frame assembly; the fan assembly is arranged in the frame assembly, the fan assembly is provided with an air intake port connected to the smoke suction port and an air outlet connected to the air intake port, the air outlet is arranged toward the top of the frame assembly; at least a portion of the check valve extends into the frame assembly and is connected to the air outlet, a center line E of the check valve is located to the left of a center line F of the frame assembly, and the check valve is used to prevent smoke from flowing back; the size of the frame assembly in the left-right direction is defined as W, and the left-right distance between the center line E of the check valve and the center line F of the frame assembly is W2, wherein,

[0006] In some embodiments, the air suction port includes a main air suction port and an auxiliary air suction port, the main air suction port is arranged toward the front side of the rack assembly, and the auxiliary air suction port is arranged toward the rear side of the rack assembly.

[0007] In some embodiments, the rack assembly includes a front side panel and a rear side panel, the fan assembly is installed in the rack assembly, and the distance h1 between the main air suction port and the front side panel is greater than the distance h2 between the auxiliary air suction port and the rear side panel.

[0008] In some embodiments, the dimension of the frame assembly in the front-to-back direction is defined as H;

[0009] in,

[0010] In some embodiments, the H value is not less than 100 mm and not more than 500 mm.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] In some embodiments, the guide hole is opened at the lowest point of the volute.

[0015] In some embodiments, the range hood further comprises a smoke collection assembly, which is disposed below the frame assembly and includes a smoke collection hood and a condensing plate, wherein 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 disposed at an angle;

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

[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 the present application, 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; wherein, This arrangement ensures that the airflow from the volute can flow along the original airflow direction to the check valve 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, changing the direction of the airflow 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 of the fan assembly and the air inlet of the check valve extending in the vertical direction is larger, and the distance the airflow flows from the wind wheel to the check valve is longer, which easily increases the flow resistance, resulting in slower airflow speed and lower flow efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A schematic structural diagram of a range hood provided in an embodiment of the present application;

[0021] Figure 2 A schematic structural diagram of a rack assembly and a fan assembly provided in an embodiment of the present application (with the front side panels omitted);

[0022] Figure 3 A schematic cross-sectional view of a rack assembly and a fan assembly provided in an embodiment of the present application;

[0023] Figure 4 A schematic structural diagram of a fan assembly provided in an embodiment of the present application;

[0024] Figure 5 A schematic structural diagram of a fan assembly provided in an embodiment of the present application from another perspective;

[0025] Figure 6 A schematic structural diagram of an oil guide assembly provided in an embodiment of the present application;

[0026] Figure 7 A schematic cross-sectional view of a smoke collection hood provided in an embodiment of the present application.

[0027] Description of Figure Numbers:

[0028] 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.

[0029] 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

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] See also Figure 1 The range hood 1 includes a frame assembly 100, a smoke collection assembly 300, and a fan assembly 200. The smoke collection assembly 300 can be installed below the frame assembly 100, near the cooking area. Its primary function is to collect and direct cooking fumes. The frame assembly 100 has a fan chamber 100b, within which the fan assembly 200 is located. The fan assembly 200 rotates to generate a strong negative pressure suction force, rapidly drawing in the fumes collected by the smoke collection assembly 300 and accelerating their discharge through the air duct to the outside, thereby reducing the concentration of fumes in the kitchen and maintaining fresh air.

[0036] Please refer to Figure 3 The frame assembly 100 is provided with an oil smoke intake port 100a, through which oil smoke enters the fan chamber 100b within the frame assembly 100 and flows to the fan assembly 200. The frame assembly 100 can be in a cubic shape. 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 together 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. Of course, the frame assembly 100 can also be provided without a bottom side panel, in which case the oil smoke intake port 100a can be formed directly.

[0037] 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.

[0038] The fan assembly 200 is provided with an air intake port and an air outlet 200c connected to the oil smoke intake port 100a. The negative pressure suction generated by the fan assembly 200 when it is in operation can suck the external oil smoke from the oil smoke intake port 100a into the fan cavity 100b, and enter the interior of the fan assembly 200 through the air intake port, and then be pushed by the airflow generated by the rotation of the fan assembly 200, and flow through the air outlet 200c to the oil smoke exhaust duct to be discharged outdoors, thereby keeping the kitchen air fresh and the cook healthy.

[0039] See also Figure 3 The fan assembly 200 includes a volute 210 and a rotor 220. The volute 210 is provided with the above-mentioned air intake and an air outlet 200c. The rotor 220 is installed in the volute 210. In some embodiments, the rotor 220 is a multi-blade centrifugal rotor 220. When viewed from the front of the range hood 1, the blades of the multi-blade centrifugal rotor 220 rotate clockwise, and the blades of the multi-blade centrifugal rotor 220 are forward blades. Forward blades (also known as forward-curved blades or forward-swept blades) in multi-blade centrifugal fans or other rotary fluid machines refer to blades whose inclination direction causes their leading edge to be closer to the air intake of the rotor 220 relative to the direction of rotation, while their trailing edge is closer to the air outlet 200c of the rotor 220. In other words, the inclination angle of the forward blades (i.e., the angle between the blade chord and the plane of rotation of the blade) enables the blades to "push" or "pull" the air forward when rotating, that is, to accelerate the airflow along the direction of rotation of the blade and the direction of air discharge.

[0040] 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.

[0041] See also Figure 2The center O of the air intake is located to the upper right of the center P of the frame assembly 100. This arrangement places the air intake at a distance from the cook's head (particularly the ears) during use. The noise of the range hood primarily originates from the operation of the fan assembly 200. This layout effectively reduces the amount of noise directly transmitted to the ears, improving cooking comfort and reducing auditory fatigue. The center of the air intake in this application can be the axis of the impeller 220, which helps reduce the wind resistance of the suction system and facilitates the collection of oil smoke by the air intake.

[0042] It should be further explained that, since the above-mentioned blades are forward blades and the direction of rotation is clockwise. Therefore, the axis of the impeller 220 in the volute 210 will be biased to the right, and the air outlet 200c will be biased to the left. The volute 210 of the present application can abut against the inner wall surface of the frame assembly 100. Specifically, the left side of the volute 210 abuts against the inner wall surface of the left plate, the right side of the volute 210 abuts against the inner wall surface of the right plate, and the upper side of the volute 210 abuts against the inner wall surface of the top side plate 130. In this way, the center O of the air intake will be set to the upper right side of the center P of the frame assembly 100, and the size of the frame assembly 100 can be set smaller. In the embodiment where the frame assembly 100 includes a bottom side panel, the bottom side of the volute 210 does not need to abut the inner wall surface of the bottom side panel. This leaves a certain amount of space at the bottom of the volute 210 to facilitate the installation of other components (such as the oil guide assembly 500 or other components that guide the liquid in the volute 210). The close contact between the volute 210 and the frame assembly 100 enhances the stability of the overall structure and reduces vibration and noise during operation.

[0043] 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, the compact design of the volute 210 and effective space utilization allow the frame assembly 100 to be even smaller. This is particularly useful in kitchens with limited space, as the compact range hood 1 can adapt to a variety of kitchen layouts and meet the needs of different users.

[0044] See also Figure 2 , 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; wherein,

[0045] This ratio limits the offset of the center O of the air intake in the width direction of the rack assembly 100; This ratio 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 are in contact with 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 wind wheel 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.

[0046] 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.

[0047] See also Figure 3 To improve the suction efficiency of the impeller 220 assembly, the suction port of the present embodiment includes a main suction port 200a and an auxiliary suction port 200b. The combination of the main suction port 200a and the auxiliary suction port 200b significantly increases the range hood's suction area and volume, thereby more effectively absorbing oil fumes. The main suction port 200a is positioned toward the front of the frame assembly 100, ensuring that it effectively captures and absorbs oil fumes generated during cooking, reducing the possibility of oil fumes spreading to other areas of the kitchen.

[0048] The auxiliary air intake 200b is set toward the rear side of the frame assembly 100, which can further inhale the oil smoke that diffuses to the rear side during the cooking process. Moreover, 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 intake 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 airflow turbulence and vortex phenomena. The setting of the auxiliary air intake 200b can effectively inhale the airflow on the rear side, thereby adjusting the front and rear air pressure difference, reducing airflow turbulence and vortex phenomena, making the airflow distribution more uniform, and improving the exhaust efficiency of oil smoke.

[0049] It should be noted that please refer to Figure 4 and Figure 5The fan assembly 200 generally also includes a mounting bearing 230, which is fixed relative to the volute 210, and then the impeller 220 is mounted on the mounting bearing 230. It can be understood that the front and rear of the volute 210 are both provided with openings communicating with the inner cavity to form an air suction port, and the mounting bearing 230 is usually installed on one side of the volute 210 and blocks at least part of the air suction port on that side, resulting in one of the air suction ports on the front and rear sides of the volute 210 having a relatively larger area (i.e., the main air suction port 200a) and a relatively smaller area (i.e., the auxiliary air suction port 200b).

[0050] See also Figure 3 , 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.

[0051] See also Figure 3 , defining the front-to-back dimension of the rack assembly 100 as H; wherein, 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 to 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 impeller 220 more smoothly, reducing unnecessary energy loss. The definition of this application It is convenient to control 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 to 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.

[0052] 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.

[0053] Please return to Figure 3 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.

[0054] In the present application, the range hood 1 described above and below has a frame assembly 100 with a left-right dimension (i.e., length) of not less than 300 mm and not more than 800 mm; a frame assembly 100 with a top-to-bottom dimension (i.e., height) of not less than 300 mm and not more than 800 mm; and a frame assembly 100 with a front-to-back dimension (i.e., thickness) of not less than 100 mm and not more than 500 mm. The range hood 1 provided in the present application can simultaneously meet the advantages of large air volume, good quietness, and small size. It can more quickly absorb and exhaust fumes and odors generated during cooking, ensuring fresh kitchen air, and does not generate 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.

[0055] 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 F extending in the vertical direction of the frame assembly 100. 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 indoors 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 smoke does not flow back.

[0056] The left-right 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; 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 duct. 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.

[0057] See also Figure 7 The 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.

[0058] See also Figure 7The 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.

[0059] See also Figure 7 The 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.

[0060] 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.

[0061] 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; a fan assembly disposed in the frame assembly, the fan assembly being provided with an air intake connected to the oil fume intake port and an air outlet connected to the air intake port, the air outlet being disposed toward the top of the frame assembly; as well as a check valve, at least a portion of which extends into the frame assembly and is in communication with the air outlet, wherein a centerline E of the check valve is located to the left of a centerline F of the frame assembly, and the check valve is used to prevent backflow of smoke; The left-right dimension of the frame assembly is defined as W, and the left-right distance between the center line E of the check valve and the center line F of the frame assembly is defined as W2, wherein:

2. The range hood according to claim 1, wherein: The air suction port includes a main air suction port and an auxiliary air suction port, the main air suction port is arranged toward the front side of the rack assembly, and the auxiliary air suction port is arranged toward the rear side of the rack assembly.

3. The range hood according to claim 2, wherein: The frame assembly includes a front side panel and a rear side panel, the fan assembly is installed in the frame assembly, and the distance h1 between the main air inlet and the front side panel is greater than the distance h2 between the auxiliary air inlet and the rear side panel.

4. The range hood according to claim 3, wherein: The dimension of the frame assembly in the front-to-back direction is defined as H; in, 5. The range hood according to claim 4, wherein: The H value is not less than 100 mm and not more than 500 mm.

6. The range hood according to any one of claims 1 to 5, 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.

7. The range hood according to claim 6, 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.

8. The range hood according to claim 7, 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.

9. The range hood according to claim 8, wherein: The guide hole is opened at the lowest point of the volute.

10. The range hood according to any one of claims 1 to 5, characterized in that: The range hood further 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; In which, the first plate body is connected to the front side of the smoke collecting hood and is provided with a first smoke outlet connected to the oil smoke suction port, and the second plate body and the back plate of the smoke collecting hood jointly define a second smoke outlet connected to the oil smoke suction port. In the front-to-back direction of the range hood, the first smoke outlet is located in front of the second smoke outlet, and the flow cross-sectional area of ​​the first smoke outlet is smaller than the flow cross-sectional area of ​​the second smoke outlet.

11. The range hood according to claim 10, 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.

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