Open type range hood

Abstract

The open type range hood comprises a front panel, a machine shell and an impeller arranged in the machine shell, the machine shell 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 smoke inlet, one part of the impeller is exposed out of the oil smoke inlet, and the other 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, covered by the front panel, of the impeller, the flow guide part at least comprises a first arc-shaped section close to the periphery of the impeller and a second arc-shaped section close to the axis of the impeller, and the arc top of the first arc-shaped section faces the front panel. The arc top of the second arc-shaped section faces the impeller and is spaced from the impeller. The flow guide part can better guide airflow to the periphery of the impeller, generation of vortexes is avoided, the arrangement of the flow guide part optimizes an air flowing path, generation of flowing dead zones and the vortexes is reduced, and the oil smoke suction effect and the air inlet efficiency of the draught fan are improved.

Description

Technical Field

[0001] The invention belongs to the field of kitchen appliances, and in particular relates to an open-type range hood. Background Art

[0002] With the continuous advancement of fan and motor technology, the range hood industry continues to launch ultra-thin range hoods. Imported open range hoods have the characteristics of the range hood directly entering the fan inlet after passing through the oil net, and the fan inlet needs to be inlet all around. However, due to the limitation of the overall size of the machine (the thickness of the whole machine is ≤200mm, the height of the smoke chamber h≤420), the upper part of the fan inlet is blocked, which leads to the deterioration of the inlet flow state, the generation of flow dead zone, the deterioration of the oil fume extraction effect, and the high working noise. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an open-type range hood in order to overcome the defect in the prior art that a dead zone of flow exists at the fan inlet, resulting in poor fume extraction effect.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] An open-type range hood comprises a front panel, a casing and an impeller arranged in the casing, the casing is connected to the front panel, the front panel comprises an upper panel and a lower panel, a fume inlet is arranged on the lower panel, a part of the impeller is exposed from the fume inlet and another part of the impeller is covered by the upper panel, the open-type range hood also comprises a guide part, the guide part is connected to the front panel and is located between the upper panel and a part of the impeller covered by the front panel, the 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 toward the upper panel, the second arc segment protrudes toward the impeller and is spaced from the front end of the impeller in the axial direction.

[0006] In this solution, the oil fume inlet is partially covered by the upper panel, which will generate an eddy zone between the upper panel and the corresponding part of the impeller, and a flow dead zone will also be generated at the high-speed rotating impeller. By setting a guide between the front panel and the impeller, wherein the first arc segment and the second arc segment face the panel and the impeller respectively, the airflow can be better guided to the periphery of the impeller to avoid the generation of eddy currents. The setting of the guide optimizes the air flow path, reduces the generation of flow dead zones and eddy currents, and improves the oil fume absorption effect. The top of the second arc segment faces the impeller and keeps a 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 absorption capacity of the fan. The first arc segment and the second arc segment work together to allow more oil fume airflow to enter the fan in an orderly manner in all directions, reducing the unstable vortex between the inlet of the upper part of the impeller and the front panel. The concentration and guidance of the airflow can increase the air intake of the impeller, so that the range hood can better absorb oil fume when working, especially in the large air volume mode. It can still maintain a high oil fume extraction efficiency, which allows the fan to operate under lower energy consumption conditions while maintaining the same suction force and oil fume extraction effect, reducing power consumption and improving the environmental performance of the equipment. At the same time, the diversion of the guide part makes the air flow smoother, reducing the interference of the unstable airflow on the surrounding environment when the impeller rotates at high speed, thereby reducing the working noise and improving the user experience.

[0007] Preferably, the arc top of the second arc segment extends into the air inlet of the housing, and the distance from the surface of the air inlet in the axial direction is 5-8 mm.

[0008] In this solution, the design of a spacing distance of 5-8mm allows the airflow to maintain good fluidity and kinetic energy when approaching the impeller. This appropriate spacing avoids the airflow from generating excessive eddies and flow resistance near the impeller, thereby effectively increasing the wind speed at the impeller inlet, allowing the oil smoke to be quickly inhaled, improving the oil smoke absorption effect. The 5-8mm spacing distance can also effectively avoid the strong eddies caused by the close distance between the impeller and the guide part, and can also avoid the influence of the guide effect due to the small spacing, which not only significantly reduces the eddy noise, but also improves the working performance of the range hood and improves the comfort of users when using it.

[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 this solution, if the first arc segment and the second arc segment are directly connected, the airflow will be smoother when passing through the guide part, reducing the flow resistance and local vortex that may be generated due to the uneven structural transition. This design can effectively guide the airflow so that it flows smoothly into the impeller, thereby improving the efficiency of oil fume absorption. When the first arc segment and the second arc segment are connected through a curved surface, a flat surface, or a combination thereof, this transition method can further refine the control of the airflow path, which helps the airflow to turn and accelerate more smoothly when passing through the guide part. In particular, the design of curved surface connection can smoothly guide the airflow, further reduce flow losses, and improve the oil fume absorption effect.

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

[0012] In this solution, by arranging guide holes at intervals on the guide part, part of the airflow can be guided through the holes when passing through the guide part, so as to be evenly distributed around the impeller, which can effectively reduce the flow resistance generated by the airflow on the surface of the guide part, enhance the guidance of the airflow, help disperse and eliminate the vortex between the guide part and the impeller, and reduce the unstable airflow caused by the vortex. It not only reduces the aerodynamic noise caused by the vortex, but also reduces the vortex noise with a smooth transition design, improves the quietness of the range hood operation, and improves the efficiency of oil fume being sucked in, thereby improving the overall oil fume suction effect. Different connection methods enable the guide part to adapt to different structural requirements and appearance design requirements, which not only meets the requirements for the smoothness of airflow guidance, but also enhances the stability of the structure, making the guide part more stable during the manufacturing and installation process. 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 space is formed between the air guide portion and the front panel.

[0014] In this solution, the space formed between the air guide and the front panel provides an additional channel for the airflow. On the one hand, more oil smoke can be diverted through this space, avoiding the oil smoke from being trapped near the front panel, significantly improving the overall oil smoke absorption effect. On the other hand, it helps to relieve the airflow pressure between the air guide and the front panel, reducing the vortex caused by sudden changes in the airflow, making the airflow more stable, thereby reducing the aerodynamic noise caused by the vortex, making the range hood quieter during operation.

[0015] Preferably, the guide portion further includes a sound absorbing member, which is disposed in the spacing space and is in close contact with the guide portion.

[0016] In this solution, the sound absorbing member is arranged in the interval space between the air guide and the front panel, which can effectively absorb and block the noise generated when the range hood is running, especially the eddy noise and aerodynamic noise transmitted through the air guide can be significantly reduced by the sound absorbing member, so as to achieve the quiet operation of the range hood and improve the user's comfort. The sound absorbing member is arranged to fit the air guide, which will not affect the smooth passage of the airflow. 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, improve the efficiency of oil smoke being sucked in, and further improve the overall performance of oil smoke extraction. The sound absorbing member in the interval space not only plays the role of sound absorption and noise reduction, but also increases the structural stability of the air guide to a certain extent. The existence of the sound absorbing member makes the connection between the air guide and the front panel closer, reducing the vibration or looseness of the air guide during operation. By reducing noise and optimizing airflow, the setting of the sound absorbing member helps to improve the efficiency of the fan, and reduces energy consumption while achieving the same oil smoke extraction effect, thus achieving the purpose of energy saving.

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

[0018] In this solution, the oil net is set at the oil fume inlet, which can effectively filter out most of the grease and particulate matter before the oil fume enters the fan, reducing the amount of these impurities entering the fan, thereby improving the separation efficiency of the range hood and extending the service life of the fan. The angle design between the flap 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 net. The existence of the angle forms an effective negative pressure area, which helps to increase the adsorption of oil fume and improve the oil fume absorption effect, especially in cooking scenes with high oil fume volume. It can also effectively prevent the backflow of oil fume; by adjusting the angle, the flap can guide the airflow to enter smoothly during the operation of the range hood, and is not easily disturbed by the external airflow, reducing the diffusion of oil fume in the cooking area, thereby improving the indoor air quality. The combination of the flap and the oil net can reduce the turbulence of the airflow to a certain extent, reduce the noise generated when the fan is running, and improve the quiet effect of the range hood. The angle design between the flap and the front panel not only optimizes the oil fume adsorption effect from a functional perspective, 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, which is arranged at the periphery of the air inlet of the casing, and the air guide portion is spaced apart from the air inlet ring.

[0020] In this solution, the air inlet ring is arranged at the periphery of the impeller to form a precise air inlet path. The gap design between the air guide and the air inlet ring can effectively guide the airflow into the impeller, making the airflow more concentrated and stable, thereby improving the efficiency of oil fume extraction; by optimizing the airflow distribution, the oil fume can be sucked into the impeller more quickly, avoiding the diffusion of the oil fume, and further improving the overall adsorption effect of the range hood. It can also further avoid the noise problem caused by airflow turbulence. The gap between the air guide and the air inlet ring can not only play a buffering role, but also provide a moving path for the diffusion of oil fume, making the airflow more stable before entering the impeller, reducing the noise when the fan is running, thereby improving the silent performance of the range hood. Since the airflow is effectively guided to the impeller, the fan can achieve the same oil fume extraction effect at a lower speed, thereby reducing energy consumption and improving the overall energy efficiency of the range hood.

[0021] Preferably, the surface of the air inlet ring is arc-shaped, and the surface of the first arc segment and the surface of the air inlet ring are aligned.

[0022] In this solution, by designing the surface of the air inlet ring to be arc-shaped and making a smooth transition between the surface of the first arc segment and the surface of the air inlet ring, the airflow can maintain continuous and smooth flow when passing through the guide part and the air inlet ring, reducing the rapid changes and turbulence of the airflow, making the airflow more stable and concentrated before entering the impeller, thereby significantly improving the oil fume adsorption efficiency and enhancing the overall oil fume absorption performance of the range hood. It can also effectively reduce the resistance of the airflow when passing through the guide part and the air inlet ring, and reduce the vortex and backflow caused by the uneven surface. This optimized design improves the air intake efficiency of the fan, allowing the fan to achieve a higher oil fume absorption effect at a lower power consumption, thereby further reducing the energy consumption of the range hood. It also significantly reduces the noise when the airflow flows on the smoothly transitioned arc surface. By reducing the disturbance and vortex of the airflow, the noise generated by the fan during operation is effectively suppressed, thereby improving the mute effect of the range hood and providing users with a quieter and more comfortable use experience.

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

[0024] In this scheme, the upper panel, the lower panel and the guide part are processed from a whole plate, and the guide part is processed from the part of the plate cut off at the oil fume inlet, which makes full use of the material. By reprocessing the cut part into a guide part, the material waste is effectively reduced, the manufacturing cost is reduced, and the rational use of resources is achieved. The upper panel, the lower panel and the guide part are processed from a whole plate, which simplifies the production process, completes the processing of all key components in one process, reduces the time for assembly and processing of different materials in manufacturing, thereby improving the processing efficiency and shortening the production cycle. By processing from a whole plate, the upper panel, the lower panel and the guide part are highly integrated, avoiding the structural weaknesses caused by the splicing of components in the traditional design, which not only enhances the stability of the overall structure, but also improves the durability and prolongs the service life. Because all components are processed from the same plate, the uniformity of size and shape is better guaranteed, reducing the error during installation, and can improve the assembly accuracy of the range hood, ensuring that the guide part cooperates more closely with key components such as the front panel and the impeller, thereby further improving the working efficiency and performance of the equipment. The tightly integrated design also helps the airflow to flow more smoothly through the guide part, reduces airflow resistance, and enhances the guide effect, thereby improving the oil fume extraction efficiency of the open-type range hood.

[0025] Preferably, the second arc segment is connected to the front panel via a connecting segment.

[0026] In this solution, the second arc segment is connected to the front panel through the connecting segment, so that the connection between the guide part and the front panel is more stable, the bonding strength between the guide structure and the front panel is enhanced, the stability of the guide part is ensured, and it 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 allows the second arc segment to be closely combined with the front panel, and at the same time, the curvature of the first arc segment and the second arc segment is optimized and adjusted to accurately guide the airflow. The first arc segment and the second arc segment are respectively optimized to guide the airflow around the periphery of the range hood and the impeller axis, so that the airflow enters the fan more smoothly, effectively reducing the overflow of oil smoke and improving the oil smoke absorption effect. Adjusting the shape and curvature of the connecting segment and other parameters helps to make the airflow transition smoothly during the diversion process, reducing the turbulence and vortex of the airflow between the front panel and the guide part. This helps to reduce the wind noise of the range hood when it is working, improve the quiet effect, and thus improve 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 thickness of the entire open range hood, the distance between the lower end point of the second arc segment and the front panel is in the range of 0.11-0.18 times the thickness of the entire open range hood, the distance between the upper end point of the second arc segment and the front panel is in the range of 0.11~0.17 times the thickness of the entire open range hood, and the distance between the upper end point of the first arc segment and the front panel is in the range of 0.08~0.13 times the thickness of the entire open range hood.

[0028] In this solution, the axial distance between the front panel and the front end of the impeller, as well as the distance between the second arc segment and the first arc segment and the front panel, are precisely designed according to the ratio of the thickness of the whole machine, which helps to precisely control the flow path of the airflow around the impeller, avoid airflow turbulence, maximize the diversion effect, and improve the efficiency of oil fume extraction. Since the distance between the guide part and the impeller is precisely designed (0.11-0.18 times the thickness of the whole machine, etc.), it can effectively reduce the vortex phenomenon at the fan inlet, reduce the flow dead zone, make the air intake smoother, improve the air intake efficiency of the impeller, ensure the smooth discharge of oil fume, and enhance the overall performance of the range hood. The distance between different arc segments and the front panel is precisely set, so that the negative pressure area of ​​the range hood is optimally distributed, which not only enhances the adsorption force, but also expands the smoke collection area, effectively captures more oil fume particles, and improves the kitchen environment. By designing a reasonable diversion distance and gap, the high-speed impact and irregular flow of air between the guide part and the impeller can be reduced, thereby reducing the noise caused by air turbulence. This is crucial to the user experience, allowing the range hood to improve its fume extraction efficiency while maintaining lower operating noise.

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

[0030] In this solution, by designing the connecting section as a curved surface, the airflow is guided more smoothly 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 guidance effect, and effectively improves the efficiency of oil fume inhalation. The application of the curved surface is particularly suitable for guiding high-speed airflow, so that the airflow can continue to maintain a good wall-adhering flow state when passing through the connecting section, avoiding eddy currents or airflow separation caused by sudden changes, which not only improves the flow guidance efficiency, but also greatly reduces the wind resistance during the oil fume inhalation process, thereby improving the performance of the whole machine. The smoothly flowing airflow reduces its impact and friction on the guide components, thereby reducing the possibility of turbulence or aerodynamic noise, which helps to reduce the noise level of the open range hood during operation, while making the fan work more efficiently, thereby reducing energy consumption. The connecting section is designed as a plane, which provides a more stable support point for the guide component, ensuring that the guide structure remains firm and stable during operation. The combination of plane and curved surface balances the airflow guidance and structural stability, enhances the overall aerodynamic performance, and improves the simplicity of manufacturing process. The combination of plane and curved surface not only meets the aerodynamic requirements, but also improves the strength and durability of the structure. The curved surface can disperse and evenly transmit the force, reducing stress concentration, while the plane provides sufficient support for the structure, thereby extending the service life of the range hood.

[0031] The positive and progressive effects of the present invention are:

[0032] The oil fume inlet is partially covered by the upper panel, which will generate an eddy zone between the upper panel and the corresponding part of the impeller, and a flow dead zone will also be generated at the high-speed rotating impeller. By setting a guide between the front panel and the impeller, in which the first arc segment and the second arc segment face the panel and the impeller respectively, the airflow can be better guided to the periphery of the impeller to avoid the generation of eddy currents. The setting of the guide optimizes the air flow path, reduces the generation of flow dead zones and eddy currents, and improves the oil fume absorption effect. The top of the second arc segment faces the impeller and keeps a 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 absorption capacity of the fan. The first arc segment and the second arc segment work together to allow more oil fume airflow to enter the fan in an orderly manner in all directions, reducing the unstable vortex between the inlet of the upper part of the impeller and the front panel. The concentration and guidance of the airflow can increase the air intake of the impeller, so that the range hood can better absorb oil fume when working, especially in the large air volume mode. It can still maintain a high oil fume extraction efficiency, which allows the fan to operate under lower energy consumption conditions while maintaining the same suction force and oil fume extraction effect, reducing power consumption and improving the environmental performance of the equipment. At the same time, the diversion of the guide part makes the air flow smoother, reducing the interference of the unstable airflow on the surrounding environment when the impeller rotates at high speed, thereby reducing the working noise and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the three-dimensional structure of an open-type range hood in one embodiment of the present invention;

[0034] Figure 2 for Figure 1 Side view of

[0035] Figure 3 for Figure 1 A schematic diagram of a three-dimensional structure from another angle;

[0036] Figure 4 for Figure 3 Sectional view along SS;

[0037] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0038] Figure 6 for Figure 1 Right view of;

[0039] Figure 7 for Figure 6 Sectional view along XX;

[0040] Figure 8 It is a schematic diagram of a three-dimensional structure in which a front panel and a guide part are integrally formed in an open-type range hood in one embodiment of the present invention;

[0041] Fig. 9 for Figure 8 A partial enlarged view of the Y point in the middle.

[0042] Fig.10 It is a partial side schematic diagram of the guide portion and the impeller according to an embodiment of the present invention.

[0043] Fig.11 The figure is an exploded schematic diagram of the air guide part and the housing according to an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 100 open 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 import

[0055] 140 diversion part

[0056] 141 First arc segment

[0057] 142 Second arc segment

[0058] 143 connection segment

[0059] 150 Interval space

[0060] 160 Oil Network

[0061] 170 Flip Board

[0062] 180 air intake circle

[0063] Distance in the F axis direction

[0064] B Flow dead zone

[0065] C eddy current zone

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

[0067] d The upper endpoint of the second arc segment

[0068] eThe turning point of the first arc segment DETAILED DESCRIPTION

[0069] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0070] like Figure 1-Figure 11As shown, this embodiment provides an open-top range hood 100, comprising a front panel 130, a housing 110, and an impeller 120 disposed in the housing 110, the front panel 130 comprising an upper panel 131 and a lower panel 132, the lower panel 132 being provided with an oil fume inlet 1321, the housing 110 comprising the oil fume inlet 1321 and the front panel 130, a portion of the impeller 120 being exposed from the oil fume inlet 1321 and another portion of the impeller 120 being covered by the front panel 130, the open-top range hood 100 further comprising a guide portion 1 40, the guide portion 140 is connected to the front panel 130 and is located between the front panel 130 and a portion of the impeller 120 covered by the front panel 130, the guide portion 140 at least includes a first arc segment 141 close to the outer periphery of the impeller 120 and a second arc segment 142 close to the axis of the impeller 120, the first arc segment 141 protrudes toward the upper panel 131 of the front panel 130, and the second arc segment 142 protrudes toward the impeller 120 and is spaced apart from the front end 121 of the impeller 120 in the axial direction (the axial direction of the impeller 120).

[0071] The oil fume inlet 1321 is partially throttled by the front cover, resulting in low air intake efficiency of the oil fume inlet 1321, and a vortex zone C is formed between the blocked oil fume inlet 1321 and the front panel 130, and the area where the impeller 120 is located constitutes a flow dead zone B. In this embodiment, by setting a guide 140 between the front panel 130 and the impeller 120, wherein the first arc segment 141 and the second arc segment 142 face the panel and the impeller 120 respectively, the guide 140 optimizes the air flow path, reduces the generation of flow dead zone B and vortex, and the design of the two arc segments reduces the unstable vortex between the upper inlet of the impeller 120 and the front panel 130, improves the air intake efficiency, not only enhances the oil fume absorption effect, but also improves the overall efficiency of the fan, making the operation of the range hood more energy-saving and efficient. The guide of the guide 140 makes the air flow smoother, reduces the interference of the unstable airflow on the surrounding environment when the impeller 120 rotates at high speed, thereby reducing the working noise and improving the user experience.

[0072] In this embodiment, the upper panel 131, the lower panel 132 and the guide 140 are processed from a whole plate, and the guide 140 is processed from a portion of the plate cut off at the oil fume inlet. As a result, the guide 140 is integrally formed with the front panel 130, and a guide structure with a cross-section profile is designed, which eliminates the seams or connecting parts that may exist in the traditional design, enhances the overall stability of the structure, reduces the performance degradation caused by the loosening or displacement of the component connection, and the overall structure is more sturdy and durable, and can withstand long-term use without being easily damaged. It has a significant effect on eliminating the flow dead zone B and vortex zone C of the oil fume inlet 1321 and increasing the inlet wind speed. In this embodiment, the manufacturing process of the guide 140 and the front panel 130 is sheet metal stamping and bending, and this method is simple and convenient to manufacture and install. The guide 140 can be formed by stamping and bending a portion of the upper panel 131, or by stamping and bending a portion of the lower panel 132, and most of the guide 140 is located in the upper panel 131.

[0073] In other alternative embodiments, the guide portion 140 is configured as a guide plate, which can be detachably connected to the front panel 130, for example, by a slideway and a slide groove, and such connection facilitates the removal and replacement of the guide portion 140. The guide plate can be connected to a portion of the upper panel 131, or to the lower panel 132, or to the junction between the upper panel 131 and the lower panel 132. When the guide plate is connected to the lower panel 132, the guide plate is bent toward the upper panel 131, so that the guide plate is located between the upper panel 131 and the impeller.

[0074] In this embodiment, if Fig.10 As shown, the arc top of the second arc segment 142 partially extends into the air inlet 111 of the casing 110, and the distance F from the surface 112 where the air inlet 111 is located in the axial direction is 5-8 mm, so that the airflow can still maintain good fluidity and kinetic energy when approaching the impeller 120. This appropriate interval avoids the airflow from generating excessive eddy currents and flow resistance near the impeller 120, thereby effectively increasing the wind speed at the inlet of the impeller 120, allowing the oil smoke to be quickly inhaled, thereby improving the oil smoke absorption effect.

[0075] like Figure 5As shown, in this embodiment, the first arc segment 141 and the second arc segment 142 are directly connected, and the first arc segment 141 and the second arc segment 142 are directly connected, so that the airflow will be smoother when passing through the guide portion 140, reducing the flow resistance and local vortex that may be generated due to the uneven structural transition. In other alternative embodiments, the first arc segment 141 and the second arc segment 142 can be smoothly transitioned through a connecting structure, wherein the connecting structure can be set to an arc, a straight line or a bent shape to form a curved surface, a plane, or a combination of a curved surface and a plane for connection. This transition method can further refine the control of the airflow path, so that the airflow can be turned and accelerated more smoothly when passing through the guide portion 140.

[0076] Furthermore, in this embodiment, a plurality of guide holes (not shown) are arranged at intervals on the guide part 140. By arranging the guide holes at intervals on the guide part 140, part of the airflow can be guided through the holes when the airflow passes through the guide part 140, so as to be evenly distributed around the impeller 120, which can effectively reduce the flow resistance generated by the airflow on the surface of the guide part 140, enhance the guiding property of the airflow, help disperse and eliminate the vortex between the guide part 140 and the impeller 120, reduce the unstable airflow caused by the vortex, not only reduce the aerodynamic noise caused by the vortex, but also improve the efficiency of oil fume being sucked in, and improve the overall oil fume suction effect.

[0077] like Figure 2-4 As shown, a spacing space 150 is formed between the air guide 140 and the front panel 130. The spacing space 150 provides an additional channel for the airflow. On the one hand, more oil smoke can be diverted through this space, avoiding the oil smoke from being retained near the front panel 130, and significantly improving the overall oil smoke absorption effect. On the other hand, it helps to alleviate the airflow compression between the air guide 140 and the front panel 130, reducing the vortex caused by the sudden change of the airflow, and the airflow becomes more stable, thereby reducing the aerodynamic noise generated by the vortex, making the range hood quieter during operation. Further, a sound absorbing member can be arranged in the spacing space 150 to fit the air guide 140. The material of the sound absorbing member can be selected from sound absorbing cotton, glass wool, mineral wool, polyester fiber sound absorbing board, textiles, etc. according to the design requirements. In this embodiment, a sound absorbing cotton with good sound absorption performance and small space is selected, which can effectively absorb and block the noise generated when the range hood is running. The vortex noise and aerodynamic noise transmitted through the air guide 140 can be significantly reduced by the sound absorbing member, thereby realizing the quiet operation of the range hood and improving the user's comfort.

[0078] like Figure 2As shown, the open-type range hood 100 also includes an oil net 160 and a flap 170. The oil net 160 is disposed at the oil fume inlet 1321, and can effectively filter out most of the grease and particulate matter before the oil fume enters the fan, reducing the amount of these impurities entering the fan, thereby improving the separation efficiency of the range hood and extending the service life of the fan. The flap 170 is connected to the front panel 130 and has an angle with the front panel 130, which can optimize the flow path of the oil fume and form an effective negative pressure zone, which helps to increase the adsorption of the oil fume and reduce the backflow and noise problems, especially in cooking scenes with high oil fume volume. The open-type range hood 100 also includes an air inlet ring 180, which is disposed on the periphery of the air inlet 111 of the housing, and a gap is provided between the air guide 140 and the air inlet ring 180. The air inlet ring 180 is arranged on the periphery of the impeller 120 to form a precise air inlet path. The gap design between the 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 flow distribution, and improve the fan efficiency.

[0079] like Fig.10 and Fig.11 As shown, the surface of the air inlet circle 180 is arc-shaped, and the surface of the first arc segment 141 and the surface of the air inlet circle 180 are aligned, that is, parallel and spaced. That is, the space between the surface of the first arc segment 141 and the surface of the air inlet circle 180 can form a coherent connection between the first arc segment 141 and the air inlet circle 180 on both sides, and the airflow passing through the first arc segment 141 can smoothly enter the surface of the air inlet circle 180. When the airflow passes through the guide portion 140 and the air inlet circle 180, it can maintain a continuous and smooth flow, reduce the resistance of the airflow, reduce the rapid changes and turbulence of the airflow, and make the airflow more stable and concentrated before entering the impeller 120, thereby significantly improving the adsorption efficiency of oil smoke and enhancing the overall oil smoke absorption performance of the range hood.

[0080] like Figure 6-9 As shown, the second arc segment 142 is connected to the front panel 130 through the connecting segment 143. One end of the first arc segment 141 is d, and the other end extends to the end. The two ends of the second arc segment 142 are b and d respectively. The thickness of the open-top range hood is E, and the value range of the thickness E is 130~200cm. 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 range of the lower end point b of the second arc segment 142 from the front panel is (0.11-0.18)E, the distance range of the upper end point d of the second arc segment 142 from the front panel 130 is (0.11~0.17)E, and the distance range of the turning end point e of the first arc segment 141 from the front panel 130 is (0.08~0.13)E.

[0081] Specifically, in this embodiment, Figure 6-9 As shown, the axial distance between the lower end point b of the second arc segment 142 and the front panel 130 is H1, which is equivalent to 0.11-0.18 times the thickness of the whole machine. H1 is 21.9mm in this embodiment. D is the diameter of the fan inlet (i.e., the air inlet 111 of the housing 110), and the value is 332mm in this embodiment. The second arc segment 142 is set to be an arc, that is, the second arc segment 142 is a curved surface; the first arc segment can be an arc or other curved surface. In this embodiment, the first arc segment 141 is a curved surface, and the turning end point e of the first arc segment 141 can be the splicing of two curved surfaces. In some other embodiments, it can also be the splicing of a curved surface and a plane, and the whole is an arc; and the first arc segment 141 is directly connected to the second arc segment 142; the connecting segment 143 can be an arc surface or other curved surface. In this embodiment, the connecting segment 143 is a combination of a plane and a curved surface, or a pure plane or a pure curved surface. The connecting section 143 is designed as a curved surface, and the airflow is guided more smoothly when passing through this area. The curved surface design eliminates the sudden turning or blockage of the airflow when passing through the connecting section, reduces the generation of turbulence, enhances the flow guidance effect, and effectively improves the efficiency of oil fume inhalation. The application of the curved surface is particularly suitable for guiding high-speed airflow, so that the airflow can continue to maintain a good wall-adhering flow state when passing through the connecting section, avoiding eddy currents or airflow separation caused by sudden changes, which not only improves the flow guidance efficiency, but also greatly reduces the wind resistance during the oil fume inhalation process, thereby improving the performance of the whole machine. The smoothly flowing airflow reduces its impact and friction on the guide 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, while making the fan work more efficiently, thereby reducing energy consumption. The connecting section is designed as a flat surface, which provides a more stable support point for the guide component, ensuring that the guide structure remains firm and stable during operation. The combination of flat and curved surfaces balances the airflow guidance and structural stability, enhances the overall aerodynamic performance, and improves the simplicity of the manufacturing process. The combination of flat and curved surfaces not only meets the aerodynamic requirements, but also improves the strength and durability of the structure. The curved surface can disperse and evenly transmit the force, reducing stress concentration, while the flat surface provides sufficient support for the structure, thereby extending the service life of the range hood.

[0082] In other alternative embodiments, the coordinates of each point can also be other values, and each segment can be adjusted to a plane, a curved surface, or a combination of a plane and a curved surface according to the actual usage scenario and the requirements for diversion strength, as long as the usage requirements can be met within the above range.

[0083] Through the above design, the purpose of increasing the wind speed at the fan inlet is achieved.

[0084] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An open-type range hood, comprising a front panel, a housing, and an impeller disposed in the housing, wherein the housing is connected to the front panel, and characterized in that: The front panel includes an upper panel and a lower panel, the lower panel is provided with an oil fume inlet, a portion of the impeller is exposed from the oil fume inlet and another portion of the impeller is covered by the upper panel, the open-type range hood also includes a guide portion, the guide portion is connected to the front panel and is located between the upper panel and a portion of the impeller covered by the upper panel, the guide portion includes 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 toward the upper panel, the second arc segment protrudes toward the impeller and is spaced apart from the front end of the impeller in the axial direction.

2. The open-type range hood according to claim 1, characterized in that: The arc top of the second arc segment extends into the air inlet of the housing, and the distance from the surface where the air inlet is located in the axial direction is 5-8 mm.

3. The open-type range hood according to claim 1, characterized in that: 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-type range hood according to claim 1, characterized in that: A plurality of guide holes are arranged at intervals on the guide part.

5. The open-type range hood according to claim 1, characterized in that: A separation space is formed between the air guide portion and the upper panel.

6. The open-type range hood according to claim 5, characterized in that: The guide part further includes a sound absorbing member, which is arranged in the interval space and is in close contact with the guide part.

7. The open-type range hood according to claim 1, characterized in that: The open-type range hood further comprises an oil net and a flap, wherein the oil net is arranged at the oil fume inlet, and the flap is connected to the front panel and has an angle with the front panel.

8. The open-type range hood according to claim 1, characterized in that: The open-type range hood further comprises an air inlet ring, which is arranged at the periphery of the air inlet of the casing, and the air guide portion is spaced apart from the air inlet ring.

9. The open-type range hood according to claim 8, characterized in that: The surface of the air inlet ring is arc-shaped, and the surface of the first arc segment is aligned with the surface of the air inlet ring.

10. The open-type range hood according to claim 1, characterized in that: The upper panel, the lower panel and the guide part are processed from a whole plate, and the guide part is processed from a portion of the plate cut off at the oil fume inlet.

11. The open-type range hood according to claim 1, characterized in that: The second arc segment is connected to the front panel via a connecting segment.

12. The open-type range hood according to claim 11, characterized in that: The axial distance between the front panel and the cover plate of the impeller is 0.12~0.2 times the thickness of the entire open range hood, the distance between the lower end point of the second arc segment and the front panel is in the range of 0.11-0.18 times the thickness of the entire open range hood, the distance between the upper end point of the second arc segment and the front panel is in the range of 0.11~0.17 times the thickness of the entire open range hood, and the distance between the upper end point of the first arc segment and the front panel is in the range of 0.08~0.13 times the thickness of the entire open range hood.

13. The open-type range hood according to claim 11, characterized in that: The connecting section is a curved surface, a flat surface or a combination of the two.

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