Open hood range hood

Abstract

The application discloses an open-type range hood, which comprises a front panel, a casing and an impeller arranged in the casing, the casing is connected with the front panel, the front panel comprises an upper panel and a lower panel, the lower panel is provided with a fume inlet, a part of the impeller is exposed to the fume inlet and another part of the impeller is covered by the upper panel, and the open-type range hood further comprises a flow guide part, the flow guide part is connected with the front panel and located between the upper panel and the part of the impeller covered by the front panel, the flow guide part at least comprises a first arc segment close to the outer periphery of the impeller and a second arc segment close to the axis of the impeller, the arc top of the first arc segment faces the front panel, and the arc top of the second arc segment faces the impeller and is spaced from the impeller. The flow guide part can guide the airflow to the outer periphery of the impeller better, so that the vortex is avoided, the setting of the flow guide part optimizes the air flow path, reduces the generation of flow dead zones and vortexes, and improves the oil fume suction effect and the air inlet efficiency of the fan.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of kitchen appliances, and particularly relates to an open type range hood. BACKGROUND

[0002] With the continuous progress of fan and motor technology, the range hood industry continues to introduce ultra-thin design range hoods. The imported open type range hood has the characteristics that the oil fume directly enters the fan inlet after passing through the oil screen, and the four sides of the fan inlet need to intake air. However, due to the limitation of the overall appearance size (the overall thickness is less than or equal to 200 mm, and the height h of the smoke collecting cavity is less than or equal to 420), the upper half of the fan inlet is blocked, which leads to poor flow state of the inlet, flow dead zone, poor oil fume suction effect, and high working noise. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the defect that the flow dead zone in the fan inlet leads to poor oil fume suction effect in the prior art, and to provide an open type range hood.

[0004] The present application solves the above technical problems by the following technical scheme:

[0005] An open type range hood, comprising a front panel, a casing and an impeller arranged in the casing, the casing is connected with the front panel, the front panel comprises an upper panel and a lower panel, the lower panel is provided with an oil fume inlet, a part of the impeller is exposed to the oil fume inlet and another part of the impeller is covered by the upper panel, the open type range hood further comprises a flow guide part, the flow guide part is connected to the front panel and located between the upper panel and the part of the impeller covered by the front panel, the flow guide part at least comprises a first arc segment close to the outer periphery of the impeller and a second arc segment close to the axis of the impeller, the first arc segment protrudes towards the upper panel, and the second arc segment protrudes towards the impeller and is spaced apart from the front end of the impeller in the axial direction.

[0006] In the scheme, the oil fume import part is covered by the upper panel, so that the vortex zone is generated between the upper panel and the part of the impeller corresponding to the upper panel, and the flow dead zone is also generated at the high-speed rotating impeller. By arranging the flow guide part between the front panel and the impeller, the first arc segment and the second arc segment in the flow guide part are directed to the panel and the impeller respectively, the air flow can be better guided to the outer periphery of the impeller, the generation of vortex is avoided, the air flow path is optimized by the arrangement of the flow guide part, the generation of flow dead zone and vortex is reduced, and the oil fume suction effect is improved. The arc top of the second arc segment is directed to the impeller and spaced from the impeller, the air flow is effectively guided into the impeller, the resistance and turbulence of the air flow are reduced, and thus the air inlet efficiency and oil fume suction capacity of the fan are improved. The first arc segment and the second arc segment jointly act, so that more oil fume flow enters the fan in an orderly manner in various directions, the unstable vortex between the upper half part import of the impeller and the front panel is reduced, the air inlet amount of the impeller is enhanced by the concentration and guidance of the air flow, the range hood can better adsorb oil fume when working, especially in the high air volume mode, the oil fume suction efficiency is still high, which makes the fan run under the condition of lower energy consumption on the premise of maintaining the same suction force and oil fume suction effect, reduces the power consumption, and improves the environmental protection performance of the equipment. Meanwhile, the flow guide of the flow guide part makes the air flow more smooth, reduces the interference of the unstable air flow of the high-speed rotating impeller to the surrounding environment, and thus the working noise is reduced and the user experience is improved.

[0007] Preferably, the arc top of the second arc segment extends into the air inlet of the machine shell, and the distance between the arc top and the surface where the air inlet is located in the axial direction is 5-8mm.

[0008] In the scheme, the design of the interval distance of 5-8mm makes the air flow maintain good flowability and kinetic energy when approaching the impeller, the appropriate interval distance avoids excessive vortex and flow resistance of the air flow near the impeller, thereby effectively improving the wind speed at the inlet of the impeller, enabling the oil fume to be quickly sucked in, improving the oil fume suction effect, and effectively avoiding the strong vortex generated between the impeller and the flow guide part due to the too close distance, and avoiding the influence of the flow guide effect due to the too small interval distance, which significantly reduces the vortex noise, improves the working performance of the range hood, and improves the comfort of the user during use.

[0009] Preferably, the first arc segment and the second arc segment are directly connected, or the first arc segment and the second arc segment are connected through a curved surface, a plane, or a combination of a curved surface and a plane.

[0010] In the present scheme, if the first arc segment and the second arc segment are directly connected, the airflow will be smoother when passing through the flow guide part, reducing the flow resistance and local vortex that may be caused by the transition of the structure. This design can effectively guide the airflow to flow smoothly into the impeller, improving the oil smoke absorption efficiency. When the first arc segment and the second arc segment are connected by a curved surface, a plane, or a combination thereof, this transition can further refine the control of the airflow path, helping the airflow to turn and accelerate more smoothly when passing through the flow guide part. In particular, the curved surface connection design can gently guide the airflow, further reducing flow loss and improving oil smoke absorption effect.

[0011] Preferably, a plurality of flow guide through holes are arranged on the flow guide part at intervals.

[0012] In the present scheme, by arranging flow guide through holes on the flow guide part at intervals, part of the airflow can be guided through the through holes when passing through the flow guide part, thereby uniformly distributing around the impeller. This can effectively reduce the flow resistance generated by the airflow on the surface of the flow guide part, enhance the guidance of the airflow, help to disperse and resolve the vortex between the flow guide part and the impeller, reduce the unstable airflow caused by the vortex, not only reduce the aerodynamic noise caused by the vortex, but also improve the running quietness of the range hood, and improve the efficiency of oil smoke being sucked in, thereby improving the overall oil smoke absorption effect. Different connection methods allow the flow guide part to adapt to different structural requirements and appearance design requirements, not only meeting the smoothness requirement of airflow guidance, but also enhancing the stability of the structure, making the flow guide part more stable during manufacturing and installation. At the same time, the flexibility of this design also allows the range hood to maintain good performance under different working conditions.

[0013] Preferably, a spacing is formed between the flow guide part and the front panel.

[0014] In the present scheme, the spacing formed between the flow guide part and the front panel provides an additional channel for the airflow. On the one hand, it allows more oil smoke to be diverted through this space, avoiding the accumulation of oil smoke near the front panel and significantly improving the overall oil smoke absorption effect. On the other hand, it helps to relieve the airflow pressure between the flow guide part and the front panel, reducing the vortex caused by sudden changes in airflow, making the airflow more stable, thereby reducing the aerodynamic noise caused by the vortex and making the range hood run more quietly.

[0015] Preferably, the flow guide part further comprises a sound absorbing member arranged in the spacing and attached to the flow guide part.

[0016] In the present scheme, the sound-absorbing piece is arranged in the interval space between the flow guide part and the front panel, which can effectively absorb and block the noise generated during the operation of the range hood, especially the vortex noise and aerodynamic noise transmitted through the flow guide part can be significantly weakened by the sound-absorbing piece, so as to realize the quiet operation of the range hood and improve the use comfort of the user. The sound-absorbing piece is arranged in close contact with the flow guide part, which does not affect the smooth passing of the airflow, and at the same time, the design of the interval space allows the airflow to be better guided and distributed before entering the impeller, which can effectively reduce the airflow resistance and improve the efficiency of the oil fume being sucked into the range hood, further improving the overall performance of the range hood. The sound-absorbing piece in the interval space not only plays a role in sound absorption and noise reduction, but also can increase the structural stability of the flow guide part to a certain extent. The existence of the sound-absorbing piece makes the connection between the flow guide part and the front panel more closely, reducing the vibration or loosening problem of the flow guide part during operation. By reducing noise and optimizing airflow, the arrangement of the sound-absorbing piece helps to improve the efficiency of the fan, reduces energy consumption under the condition of achieving the same oil fume suction effect, and achieves the purpose of energy saving.

[0017] Preferably, the open-type range hood further comprises an oil screen and a turning plate, the oil screen is arranged at the oil fume inlet, and the turning plate is connected with the front panel and has an included angle with the front panel.

[0018] In the present scheme, the oil screen is arranged at the oil fume inlet, which can effectively filter out most of the oil and particulate matter before the oil fume enters the fan, reducing the entry of these impurities into the fan, thereby improving the separation efficiency of the range hood and prolonging the service life of the fan. The included angle design between the turning plate and the front panel can optimize the flow path of the oil fume, so that the oil fume is further concentrated and guided into the fan after passing through the oil screen, and the existence of the included angle forms an effective negative pressure area, which helps to increase the adsorption force of the oil fume and improve the oil fume suction effect, especially in high oil fume quantity cooking scenarios. It is particularly significant, and can effectively prevent the backflow of oil fume; by adjusting the included angle, the turning plate can guide the airflow to smoothly enter during the operation of the range hood, and is not easily disturbed by external airflow, reducing the diffusion of oil fume in the cooking area, thereby improving the indoor air quality. The combination of the turning plate and the oil screen can reduce the turbulence of the airflow to a certain extent, reduce the noise generated during the operation of the fan, and improve the mute effect of the range hood. The included angle design of the turning plate and the front panel not only optimizes the adsorption effect of the oil fume from the function, but also enhances the overall appearance design of the range hood, making the product more beautiful and modern, while maintaining excellent practical performance.

[0019] Preferably, the open-type range hood further comprises an air inlet ring, the air inlet ring is arranged at the periphery of the air inlet of the casing, and the flow guide part is arranged in interval with the air inlet ring.

[0020] In the scheme, the air inlet ring is arranged at the periphery of the impeller to form an accurate air inlet path, and the gap between the flow guide part and the air inlet ring can effectively guide the airflow into the impeller, so that the airflow is more concentrated and stable, thereby improving the efficiency of the oil fume suction. By optimizing the airflow distribution, the oil fume can be quickly sucked into the impeller, avoiding the diffusion of the oil fume, and further improving the overall adsorption effect of the oil fume extractor. It can further avoid the noise problem caused by airflow turbulence. The gap between the flow guide part and the air inlet ring can not only play a buffering role, but also provide a moving path for the diffusion of the oil fume, so that the airflow is more stable before entering the impeller, reducing the noise of the fan during operation, thereby improving the noise reduction performance of the oil fume extractor. Since the airflow is effectively guided to the impeller, the fan can achieve the same oil fume suction effect at a lower speed, thereby reducing energy consumption and improving the overall energy efficiency of the oil fume extractor.

[0021] Preferably, the surface of the air inlet ring is arc-shaped, and the surface of the first arc-shaped section is arranged in alignment with the surface of the air inlet ring.

[0022] In the scheme, by designing the surface of the air inlet ring as an arc shape and smoothly transitioning between the surface of the first arc-shaped section and the surface of the air inlet ring, the airflow can maintain continuous and smooth flow when passing through the flow guide part and the air inlet ring, reducing the sharp changes and turbulence of the airflow, making the airflow more stable and concentrated before entering the impeller, thereby significantly improving the adsorption efficiency of the oil fume and enhancing the overall oil fume suction performance of the oil fume extractor. It can also effectively reduce the resistance of the airflow when flowing through the flow guide part and the air inlet ring, reduce the vortex and backflow phenomenon caused by the non-smooth surface, and improve the air intake efficiency of the fan, so that the fan can achieve higher oil fume suction effect at lower power consumption, thereby further reducing the energy consumption of the oil fume extractor. When the airflow flows on the smoothly transitioned arc surface, the noise is significantly reduced. By reducing the disturbance and vortex of the airflow, the noise generated by the fan during operation is effectively suppressed, thereby improving the noise reduction effect of the oil fume extractor and providing users with a more quiet and comfortable use experience.

[0023] Preferably, the upper panel, the lower panel, and the flow guide part are processed from a whole piece of plate material, and the flow guide part is processed from the part of the plate material cut off at the oil fume inlet.

[0024] In the present scheme, the upper panel, the lower panel and the flow guide part are processed from a whole piece of plate material, the flow guide part is processed from the part of plate material cut off at the oil fume inlet, the material is fully utilized, the material waste is effectively reduced by reprocessing the cut-off part into the flow guide part, the manufacturing cost is reduced, and the rational use of resources is realized. The upper panel, the lower panel and the flow guide part are processed from a whole piece of plate material, which simplifies the production process, completes the processing of all key parts in one process, reduces the time for assembling and handling different materials in manufacturing, thereby improving the processing efficiency and shortening the production cycle. The upper panel, the lower panel and the flow guide part are processed from a whole piece of plate material, which realizes high integration, avoids the structural weakness caused by the splicing of parts in the traditional design, not only enhances the stability of the overall structure, but also improves the durability and prolongs the service life. Because all parts are processed from the same piece of plate material, the uniformity of size and shape is better guaranteed, the installation error is reduced, the assembly precision of the range hood can be improved, and the cooperation between the flow guide part and the front panel, impeller and other key parts is more closely, thereby further improving the working efficiency and performance of the equipment. The closely combined design also helps the airflow to pass through the flow guide part more smoothly, reduces the airflow resistance, improves the flow guide effect, and thus improves the oil fume extraction efficiency of the open type range hood.

[0025] Preferably, the second arc-shaped segment is connected with the front panel through a connecting segment.

[0026] In the present scheme, the second arc-shaped segment is connected with the front panel through a connecting segment, which makes the connection between the flow guide part and the front panel more stable, enhances the bonding strength of the flow guide structure and the front panel, ensures the stability of the flow guide part, and is not easy to be displaced or deformed due to airflow impact or long-term use, thereby improving the structural integrity and durability of the range hood. The existence of the connecting segment makes the second arc-shaped segment and the front panel closely combined, and the radii of the first arc-shaped segment and the second arc-shaped segment are adjusted to accurately guide the airflow. The first arc-shaped segment and the second arc-shaped segment are optimized for the airflow around the outer periphery of the range hood and the axis of the impeller, respectively, so that the airflow enters the fan more smoothly, effectively reduces the overflow of oil fume, and improves the oil fume extraction effect. Adjusting the shape radius and other parameters of the connecting segment helps to smoothly transition the airflow during the flow guide process, reducing the turbulence and vortex of the airflow between the front panel and the flow guide part. This helps to reduce the wind noise of the range hood during operation, improves the quietness, and thus improves the user experience.

[0027] Preferably, the axial distance between the front panel and the front end of the impeller is 0.12-0.2 times the overall thickness of the open-range range hood, the distance between the lower end point of the second arc-shaped section and the front panel is 0.11-0.18 times the overall thickness of the open-range range hood, the distance between the upper end point of the second arc-shaped section and the front panel is 0.11-0.17 times the overall thickness of the open-range range hood, and the distance between the upper end point of the first arc-shaped section and the front panel is 0.08-0.13 times the overall thickness of the open-range range hood.

[0028] In this solution, the axial distance between the front panel and the front end of the impeller and the distances between the second arc-shaped section and the first arc-shaped section and the front panel are accurately designed according to the proportion of the overall thickness, which helps to accurately control the flow path of the airflow around the impeller, avoid airflow turbulence, maximize the flow guiding effect, and improve the efficiency of oil fume extraction. Since the distance between the flow guiding part and the impeller is accurately designed (0.11-0.18 times the overall thickness, etc.), the vortex phenomenon at the fan inlet can be effectively reduced, the flow dead zone is reduced, the air intake is smoother, the air intake efficiency of the impeller is improved, the smooth exhaust of oil fume is ensured, and the overall performance of the range hood is enhanced. The accurate setting of the distances of different arc-shaped sections from the front panel optimizes the distribution of the negative pressure area of the range hood, not only enhances the adsorption force, but also expands the area of gathering smoke, effectively captures more oil fume particles, and improves the kitchen environment. By designing reasonable flow guiding distances and gaps, the high-speed impact and irregular flow of air between the flow guiding part and the impeller can be reduced, and the noise caused by air turbulence is reduced. This is crucial for user experience, allowing the range hood to improve the efficiency of oil fume extraction while maintaining low operating noise.

[0029] Preferably, the connecting section is curved, flat, or a combination of both.

[0030] In the present scheme, by designing the connecting section as a curved surface, the airflow is more smoothly guided when passing through this area. The curved surface design eliminates the sudden turn or blockage of the airflow when passing through the connecting section, reduces the generation of turbulence, enhances the flow guiding effect, and thus effectively improves the suction efficiency of the oil fume. The application of the curved surface is particularly suitable for guiding high-speed airflow, so that the airflow can maintain a good wall-flow state when passing through the connecting section, avoiding vortex or airflow separation phenomena caused by sudden changes. This not only improves the flow guiding efficiency, but also greatly reduces the wind resistance during oil fume suction, thereby improving the overall performance of the machine. The smooth airflow reduces its impact and friction on the flow guiding components, thereby reducing the possibility of turbulence or aerodynamic noise, which helps to reduce the noise level of the open-type range hood during operation, and makes the fan work more efficiently, thereby reducing energy consumption. The connecting section is designed as a plane, which provides a more structurally stable support point for the flow guiding components, ensuring that the flow guiding structure remains firm and stable during operation. The combination of the plane and the curved surface balances the airflow guiding and structural stability, enhances the overall aerodynamic performance, and improves the simplicity of the manufacturing process. The combination of the plane and the curved surface not only meets the aerodynamic requirements, but also improves the structural strength and durability. The curved surface can disperse and evenly transmit the stress, reducing stress concentration, while the plane provides sufficient support for the structure, thereby prolonging the service life of the range hood.

[0031] The positive progress effect of the present application is that:

[0032] The oil fume inlet part is covered by the upper panel, which will generate a vortex zone between the upper panel and the corresponding part of the impeller. The high-speed rotating impeller also generates a flow dead zone. By providing a flow guiding part between the front panel and the impeller, the first arc-shaped section and the second arc-shaped section of the flow guiding part are directed towards the panel and the impeller respectively, which can better guide the airflow to the outer periphery of the impeller, avoiding the generation of vortex. The setting of the flow guiding part optimizes the air flow path, reduces the generation of flow dead zone and vortex, and improves the oil fume suction effect. The arc top of the second arc-shaped section is directed towards the impeller and maintains a certain distance from the impeller, effectively guiding the airflow into the impeller, reducing the resistance and turbulence of the airflow, thereby improving the air intake efficiency and oil fume suction capacity of the fan. The first arc-shaped section and the second arc-shaped section work together to make more oil fume flow orderly enter the fan in various directions, reducing the unstable vortex between the upper half of the impeller inlet and the front panel. The concentration and guidance of the airflow can enhance the air intake of the impeller, so that the range hood can better adsorb oil fume during operation, especially in the high air volume mode, it can still maintain a high oil fume suction efficiency. This makes the fan run at a lower energy consumption under the premise of maintaining the same suction force and oil fume suction effect, reduces the power consumption, and improves the environmental performance of the equipment. At the same time, the flow guiding of the flow guiding part makes the air flow more smoothly, reducing the disturbance of the unstable airflow around the impeller during high-speed rotation, thereby reducing the working noise and improving the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Fig. 1 is a perspective view of an open-type range hood according to an embodiment of the present application;

[0034] Figure 2 Fig. 2 is a side view of the open-type range hood of Fig. 1; Figure 1

[0035] Figure 3 Fig. 3 is another perspective view of the open-type range hood of Fig. 1; Figure 1

[0036] Figure 4 Fig. 4 is a sectional view taken along line S-S of Fig. 1; Figure 3

[0037] Figure 5 Fig. 5 is an enlarged view of portion A of Fig. 1; Figure 4

[0038] Figure 6 Fig. 6 is a right view of the open-type range hood of Fig. 1; Figure 1

[0039] Figure 7 Fig. 7 is a sectional view taken along line X-X of Fig. 1; Figure 6

[0040] Figure 8 Fig. 8 is a perspective view of a front panel and a flow guide integrally formed with each other according to an embodiment of the present application;

[0041] Figure 9 Fig. 9 is an enlarged view of portion Y of Fig. 8; Figure 8

[0042] Figure 10 Fig. 10 is a side view of a flow guide and an impeller according to an embodiment of the present application;

[0043] Figure 11 Fig. 11 is an exploded view of a flow guide and a housing according to an embodiment of the present application;

[0044] REFERENCE NUMERALS

[0045] 100 open-type range hood

[0046] 110 housing

[0047] 111 air inlet

[0048] 112 surface

[0049] 120 impeller

[0050] 121 front end

[0051] 130 front panel

[0052] 131 upper panel​​​​​​​

[0053] 132 lower panel

[0054] 1321 oil fume inlet

[0055] 140 flow guide portion

[0056] 141 first arc-shaped segment

[0057] 142 second arc-shaped segment

[0058] 143 connecting segment

[0059] 150 spacing space

[0060] 160 oil screen

[0061] 170 flap

[0062] 180 air inlet ring

[0063] F distance in the direction of the axis

[0064] B flow dead zone

[0065] C vortex zone

[0066] b lower end point of the second arc-shaped segment

[0067] d upper end point of the second arc-shaped segment

[0068] e turning end point of the first arc-shaped segment DETAILED DESCRIPTION

[0069] The application will be further described by way of example only with reference to the accompanying drawings.

[0070] As Figures 1-11As shown, the embodiment provides an open-type range hood 100, which includes a front panel 130 and a casing 110, and an impeller 120 arranged in the casing 110, the front panel 130 includes an upper panel 131 and a lower panel 132, the lower panel 132 is provided with a smoke inlet 1321, the casing 110 includes the smoke inlet 1321 and the front panel 130, a part of the impeller 120 is exposed to the smoke inlet 1321 and another part of the impeller 120 is covered by the front panel 130, the open-type range hood 100 further includes a flow guide part 140, which is connected to the front panel 130 and located between the front panel 130 and the part of the impeller 120 covered by the front panel 130, the flow guide part 140 at least includes a first arc-shaped section 141 close to the outer periphery of the impeller 120 and a second arc-shaped section 142 close to the axis of the impeller 120, the first arc-shaped section 141 protrudes towards the upper panel 131 of the front panel 130, and the second arc-shaped section 142 protrudes towards the impeller 120 and is spaced from the front end 121 of the impeller 120 in the axial direction (the direction of the axis of the impeller 120).

[0071] The smoke inlet 1321 is partially throttled by the front cover plate, resulting in low air intake efficiency of the smoke inlet 1321, and a vortex area C is formed between the blocked smoke inlet 1321 and the front panel 130, and the area where the impeller 120 is located constitutes a flow dead zone B. In the embodiment, the flow guide part 140 is arranged between the front panel 130 and the impeller 120, and the first arc-shaped section 141 and the second arc-shaped section 142 thereof respectively protrude towards the panel and the impeller 120, the flow guide part 140 optimizes the air flow path, reduces the generation of flow dead zone B and vortex, and the design of the two arc-shaped sections reduces the unstable vortex between the upper half of the impeller 120 and the front panel 130, improves the air intake efficiency, not only enhances the oil fume suction effect, but also improves the overall efficiency of the fan, so that the operation of the range hood is more energy-saving and efficient. The flow guide of the flow guide part 140 makes the air flow more smooth, reduces the interference of unstable airflow of the impeller 120 rotating at high speed to the surrounding environment, so as to reduce the working noise and improve the user experience.

[0072] In the embodiment, the upper panel 131, the lower panel 132 and the flow guide part 140 are processed from a whole plate, and the flow guide part 140 is processed from the part of the plate cut off at the oil fume inlet. Thus, the flow guide part 140 is integrally formed with the front panel 130, and a cross-sectionally special-shaped flow guide structure is designed, the joint or connecting part possibly existing in the traditional design is eliminated, the overall stability of the structure is enhanced, the performance decline caused by the loosening or displacement of the connecting part is reduced, the overall structure is more solid and durable, and can withstand long-time use without being easily damaged, which has obvious effects on eliminating the flow dead zone B and vortex zone C of the oil fume inlet 1321 and improving the inlet wind speed. In the embodiment, the manufacturing process of the flow guide part 140 and the front panel 130 is stamping and bending of sheet metal parts, and such manufacturing and installation are simple and convenient. The flow guide part 140 can be formed by stamping and bending of the upper panel 131 part or the lower panel 132 part, and the flow guide part 140 is mostly located in the upper panel 131 part.

[0073] In other alternative embodiments, the flow guide part 140 is provided as a flow guide plate, which can be detachably connected with the front panel 130, for example, through a slide and a sliding groove, and such connection facilitates the disassembly and replacement of the flow guide part 140. The flow guide plate can be connected to the upper panel 131 part, the lower panel 132 or the joint between the upper panel 131 and the lower panel 132, and when the flow guide plate is connected to the lower panel 132, the flow guide plate is bent towards the upper panel 131, so that the flow guide plate is located between the upper panel 131 and the impeller.

[0074] In the embodiment, as shown in Figure 10 The top of the arc of the second arc-shaped segment 142 extends into the air inlet 111 of the casing 110, and the distance F between the top of the arc and the surface 112 where the air inlet 111 is located in the axial direction is 5-8 mm, so that the air flow can still maintain good flowability and kinetic energy when approaching the impeller 120. The appropriate interval avoids excessive vortex and flow resistance of the air flow near the impeller 120, thereby effectively improving the wind speed at the inlet of the impeller 120, enabling the oil fume to be quickly sucked in, and improving the oil fume suction effect.

[0075] As shown in Figure 5As shown, in this embodiment, the first arc segment 141 and the second arc segment 142 are directly connected. This direct connection allows for smoother airflow as it passes through the guide section 140, reducing flow resistance and localized eddies that may result from uneven structural transitions. In other alternative embodiments, the first arc segment 141 and the second arc segment 142 can be smoothly connected via a connecting structure. This connecting structure can be arc-shaped, straight, or bent, forming a combination of curved surfaces, planes, or a combination of curved and plane surfaces for connection. This transition method further refines the control of the airflow path, allowing the airflow to turn and accelerate more smoothly as it passes through the guide section 140.

[0076] Furthermore, in this embodiment, the flow guide 140 is provided with a plurality of flow guide holes (not shown in the figure) at intervals. By providing flow guide holes at intervals on the flow guide 140, some of the airflow can be guided through the holes when passing through the flow guide 140, thereby being evenly distributed around the impeller 120. This can effectively reduce the flow resistance generated on the surface of the flow guide 140, enhance the guiding ability of the airflow, help disperse and dissipate the vortices between the flow guide 140 and the impeller 120, reduce the unstable airflow caused by the vortices, not only reduce the aerodynamic noise caused by the vortices, but also improve the efficiency of oil fume extraction and enhance the overall oil fume extraction effect.

[0077] like Figures 2-4 As shown, a space 150 is formed between the airflow guide 140 and the front panel 130. This space provides an additional channel for airflow, allowing more fumes to be diverted and preventing them from lingering near the front panel 130, significantly improving the overall fume extraction effect. Furthermore, it helps alleviate airflow pressure between the airflow guide 140 and the front panel 130, reducing eddies caused by sudden airflow changes and making the airflow more stable. This reduces aerodynamic noise generated by eddies, making the range hood quieter during operation. Additionally, sound-absorbing components can be installed within the space 150, fitting snugly against the airflow guide 140. The material of the sound-absorbing components can be selected according to design requirements, such as sound-absorbing cotton, glass wool, mineral wool, polyester fiber sound-absorbing panels, and textiles. In this embodiment, sound-absorbing cotton with good sound absorption performance and a small footprint is selected, effectively absorbing and blocking noise generated during range hood operation. Eddy noise and aerodynamic noise transmitted through the airflow guide 140 can be significantly reduced by the sound-absorbing components, thereby achieving quiet operation of the range hood and improving user comfort.

[0078] like Figure 2As shown, the open hood 100 also includes an oil screen 160 and a flap 170. The oil screen 160 is arranged at the oil smoke inlet 1321 and can effectively filter most of the oil and particulate matter before the oil smoke enters the fan, thereby reducing the impurities entering the fan, improving the separation efficiency of the hood, and prolonging the service life of the fan. The flap 170 is connected to the front panel 130 and has an included angle with the front panel 130, which can optimize the flow path of the oil smoke, form an effective negative pressure area, and help increase the adsorption of the oil smoke, thereby reducing the backflow and noise problems, especially in high oil smoke cooking scenarios. The open hood 100 also includes an air inlet ring 180 arranged at the periphery of the air inlet 111 of the housing, and a gap is arranged between the air guide part 140 and the air inlet ring 180. The air inlet ring 180 is arranged at the periphery of the impeller 120 to form an accurate air inlet path, and the gap between the air guide part 140 and the air inlet ring 180 can effectively guide the vortex area C between the impeller 120 and the front panel 130, optimize the air distribution, and improve the fan efficiency.

[0079] As shown in Figure 10 and Figure 11 The surface of the air inlet ring 180 is arc-shaped, and the surface of the first arc-shaped section 141 is arranged in alignment with the surface of the air inlet ring 180, i.e., parallel and spaced. That is, the gap between the surface of the first arc-shaped section 141 and the surface of the air inlet ring 180 can form a continuous connection between the two sides of the first arc-shaped section 141 and the air inlet ring 180, and the airflow passing through the first arc-shaped section 141 can smoothly enter the surface of the air inlet ring 180. The airflow can maintain continuous and smooth flow when passing through the air guide part 140 and the air inlet ring 180, thereby reducing the resistance of the airflow, reducing the sharp changes and turbulence of the airflow, and making the airflow more stable and concentrated before entering the impeller 120, thereby significantly improving the adsorption efficiency of the oil smoke and enhancing the overall oil smoke adsorption performance of the hood.

[0080] As shown in Figures 6-9 The second arc-shaped section 142 is connected to the front panel 130 through the connecting section 143. One end point of the first arc-shaped section 141 is d, and the other end extends to the end. The two end points of the second arc-shaped section 142 are b and d, respectively. The overall thickness of the open hood is E, and the thickness E is in the range of 130-200 cm. The axial distance between the front panel 130 and the front end 121 of the impeller is in the range of (0.12-0.2)E. The distance between the lower end point b of the second arc-shaped section 142 and the front panel is in the range of (0.11-0.18)E. The distance between the upper end point d of the second arc-shaped section 142 and the front panel 130 is in the range of (0.11-0.17)E. The distance between the turning end point e of the first arc-shaped section 141 and the front panel 130 is in the range of (0.08-0.13)E.

[0081] Specifically, in the present embodiment, asFigures 6-9 As shown, the lower end point b of the second arc segment 142 is at an axial distance H1 from the front panel 130, H1 is equivalent to 0.11-0.18 times the overall thickness, and H1 is 21.9 mm in this embodiment. D is the diameter of the fan inlet (i.e., the air inlet 111 of the casing 110), and is 332 mm in this embodiment. The second arc segment 142 is designed as a circular arc, i.e., the second arc segment 142 is a curved surface; the first arc segment can be a circular arc or other curved surface, and the first arc segment 141 is a curved surface in this embodiment. The first arc segment 141 can be divided into two curved segments at the turning end point e, or can be a curved surface and a flat surface in other embodiments, and the overall shape is arc-shaped. The first arc segment 141 is directly connected to the second arc segment 142. The connecting segment 143 can be a circular arc surface or other curved surface, and is a combination of a flat surface and a curved surface in this embodiment, or can be a pure flat surface or a pure curved surface. The connecting segment 143 is designed as a curved surface, which can guide the airflow more smoothly when passing through this area. The curved surface design eliminates the sudden turning or blocking of the airflow when passing through the connecting segment, reduces the generation of turbulence, enhances the flow guiding effect, and effectively improves the suction efficiency of the oil fume. The application of the curved surface is particularly suitable for guiding high-speed airflow, so that the airflow can maintain a good wall-flow state when passing through the connecting segment, avoiding the generation of vortex or airflow separation due to sudden changes, which not only improves the flow guiding efficiency, but also greatly reduces the wind resistance during the oil fume suction process, thereby improving the overall performance. The smooth airflow reduces the impact and friction of the airflow on the flow guiding component, thereby reducing the possibility of generating turbulence or aerodynamic noise, which helps to reduce the noise level of the open-type range hood during operation, and makes the fan work more efficiently, thereby reducing energy consumption. The connecting segment is designed as a flat surface, which provides a more stable support point for the flow guiding component, ensuring that the flow guiding structure remains firm and stable during operation. The combination of the flat surface and the curved surface balances the airflow guiding and structural stability, enhances the overall aerodynamic performance, and improves the simplicity of the manufacturing process. The combination of the flat surface and the curved surface not only meets the aerodynamic requirements, but also improves the structural strength and durability. The curved surface can disperse and evenly transmit the stress, reducing stress concentration, while the flat surface provides sufficient support for the structure, thereby prolonging the service life of the range hood.

[0082] In other alternative embodiments, the coordinates of the points can also be other values, and the segments can be adjusted to be flat, curved, or a combination of flat and curved surfaces according to the actual use scene and the demand for flow guiding intensity, as long as they can meet the use requirements within the above-mentioned range.

[0083] Through the above design, the purpose of improving the fan inlet air speed is achieved.

[0084] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that the present application is only illustrated by way of example, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. An open type range hood comprising a front panel, a casing, and an impeller provided in the casing, the casing being connected to the front panel, characterized in that, The front panel comprises an upper panel and a lower panel, the lower panel is provided with a cooking fume inlet, a part of the impeller is exposed to the cooking fume inlet and another part of the impeller is covered by the upper panel, the open-range cooking fume extractor further comprises a flow guide part connected to the front panel and located between the upper panel and the part of the impeller covered by the upper panel, the flow guide part comprises at least a first arc segment close to the outer periphery of the impeller and a second arc segment close to the axis of the impeller, the first arc segment protrudes towards the upper panel, and the second arc segment protrudes towards the impeller and is spaced from the front end of the impeller in the axial direction.

2. The open hood range hood of claim 1, wherein, The top of the second arc segment extends into the air inlet of the casing, and the distance between the top of the second arc segment and the surface of the air inlet in the axial direction is 5-8 mm.

3. The open hood range hood of claim 1, wherein, The first arc segment and the second arc segment are directly connected, or the first arc segment and the second arc segment are connected through a curved surface, a flat surface, or a combination of a curved surface and a flat surface.

4. The open hood range hood of claim 1, wherein, A plurality of flow guide through holes are arranged on the flow guide part in a spaced manner.

5. The open hood range hood of claim 1, wherein, A spacing space is formed between the flow guide part and the upper panel.

6. The open hood range hood of claim 5, wherein, The flow guide part further comprises a sound absorbing member arranged in the spacing space and attached to the flow guide part.

7. The open hood range hood of claim 1, wherein, The open-range cooking fume extractor further comprises an oil screen and a flap, the oil screen is arranged at the cooking fume inlet, and the flap is connected to the front panel and has an included angle with the front panel.

8. The open hood range hood of claim 1, wherein, The open-range cooking fume extractor further comprises an air inlet ring arranged at the periphery of the air inlet of the casing, and the flow guide part is arranged in a spaced manner between the flow guide part and the air inlet ring.

9. The open hood range hood of claim 8, wherein, The surface of the air inlet ring is arc-shaped, and the surface of the first arc segment is arranged in alignment with the surface of the air inlet ring.

10. The open hood range hood of claim 1, wherein, The upper panel, the lower panel, and the flow guide part are processed from a whole panel, and the flow guide part is processed from the part of the panel cut off at the cooking fume inlet.

11. The open hood range hood of claim 1, wherein, The second arc segment is connected to the front panel through a connecting segment.

12. The open hood range hood of claim 11, wherein, The axial distance between the front panel and the cover plate of the impeller is 0.12-0.2 times the overall thickness of the open-range cooking fume extractor, the distance between the lower end point of the second arc segment and the front panel is 0.11-0.18 times the overall thickness of the open-range cooking fume extractor, the distance between the upper end point of the second arc segment and the front panel is 0.11-0.17 times the overall thickness of the open-range cooking fume extractor, and the distance between the upper end point of the first arc segment and the front panel is 0.08-0.13 times the overall thickness of the open-range cooking fume extractor.

13. The open hood range hood of claim 11, wherein, The connecting segment is a curved surface, a flat surface, or a combination of the two.

Images