Range hood with flow guide air inlet structure

Abstract

The invention relates to a range hood with a flow guide air inlet structure, which is characterized in that an upper fan frame is matched with a side suction type mesh enclosure to serve as a spatial layout of an air duct, at least one symmetrical flow guide plate is additionally arranged on each of the left side and the right side of the fan frame, and each flow guide plate vertically extends downwards from the corresponding bottom edge of the fan frame to a distance of 20-50mm away from the upper edge of the mesh enclosure; the area between the left drainage plate and the right drainage plate serves as a pressure extension area of the air duct, and the lower edge of each drainage plate is provided with an outward horn mouth type pressure expansion area. A baffle is arranged under the fan of the fan frame, the top end of the baffle is installed on the lower edge, away from the rear surrounding plate, of the fan volute, the bottom end of the baffle inclines downwards and extends to be adjacent to the rear surrounding plate in the direction gradually close to the rear surrounding plate and goes deep into the pressure extension area, and the baffle serves as an air uniformizing plate for balancing the air speed of the left area, the middle area and the right area of the mesh enclosure.

Description

Technical Field

[0001] The invention relates to the field of range hoods, and in particular to a range hood with an air guide inlet structure. Background Art

[0002] In today's kitchen appliance market, with the reduction of living space and the increase of building density, the effective emission of oil smoke and noise control have become the focus of users when purchasing range hoods.

[0003] In a traditional range hood with a top-mounted fan frame and a side-suction grille, the fan frame is located above the grille, and the air path is as follows: Figure 1 As shown, the smoking port faces outwards away from the user, effectively reducing noise; Figure 2 As shown in the figure, the grille is tilted against the wall, the total width of the air inlet is 682mm, the fan frame is 405mm wide, and is located above the grille. The fan frame is 114mm away from the upper edge of the grille. This area is directly used as the pressure expansion area. In the design of traditional top-mounted range hoods, the fan system of the range hood is installed above the air inlet grille. Although this design takes into account the need to reduce noise, it sacrifices suction efficiency due to the increased pressure loss in the air duct. This contradiction has become a technical obstacle to improving the performance of range hoods. Market research shows that users have high expectations for the suction effect of range hoods, but traditional designs often fail to achieve ideal results. Summary of the invention

[0004] In order to improve the deficiencies in the prior art, the present invention provides a range hood with an air guide inlet structure.

[0005] The range hood of the present invention adopts an upper fan frame and a lower mesh cover as the spatial layout of the air duct, and at least one symmetrical guide plate is added to the left and right sides of the fan frame respectively, and each guide plate extends vertically downward from the corresponding bottom edge of the fan frame to a distance of 20-50 mm from the upper edge of the mesh cover, and the area between the guide plates on the left and right sides serves as the pressure extension area of ​​the air duct, and the lower edge of the guide plate is provided with an outward trumpet-shaped pressure expansion area; a baffle is provided directly below the fan of the fan frame, and the top end of the baffle is installed at the lower edge of the fan volute away from the rear panel, and the bottom end of the baffle is inclined downward and extends in a direction gradually approaching the rear panel to the rear panel adjacent to the rear panel and deep into the pressure extension area, and the baffle serves as a uniform wind plate for balancing the wind speeds in the left, middle and right areas of the mesh cover.

[0006] The intermediate crimping assembly provided by the present invention also includes the following auxiliary technical solutions:

[0007] The bottom end of the baffle plate extends to be flush with the bottom edge of the guide plate or the height difference between the bottom end of the baffle plate and the bottom edge of the guide plate is within a set threshold.

[0008] Among them, the part of the baffle located in the pressure extension zone is divided into a first section relatively close to the rear panel and a second section relatively far away from the rear panel by a dividing line. The dividing line is perpendicular to the guide plate and located above the middle part of the mesh cover; the first section forms an inverted triangle structure that gradually converges toward the rear panel.

[0009] Among them, the lower edge of the guide plate is connected with an outer flap with a length of ≥10mm. The lower edge of the outer flap is higher than the upper edge of the mesh cover to form a gap, and the area between the outer flaps on the left and right sides serves as a trumpet-shaped pressure expansion zone outward.

[0010] The ratio of the width between the left and right sides of the fan frame to the width between the left and right sides of the mesh cover is 55-65%.

[0011] Among them, the left and right edges of the baffle are bent upward to form flanges, and the width A between the left and right sides of the baffle is configured so that the circumscribed circle cutting angles α and β between the top of the baffle and the outer edge of the volute are both ≥15°. The baffle serves as an interception plate for oil dripping from the fan and a reused plate of the wind uniformity plate for balancing the wind speed in the left, middle and right areas of the mesh cover.

[0012] The baffle is installed with an angle γ of 30° downward.

[0013] Among them, the flange height is less than 6mm.

[0014] The implementation of the present invention includes the following technical effects:

[0015] 1. The present invention improves the spatial layout of the fan frame and the air inlet, and adjusts the fan frame in the traditional range hood, which is far away from the upper edge of the mesh cover, to a close distance of only 20-50mm, which significantly reduces the pressure loss caused by the distance. By reducing the space between the fan frame and the air inlet, the air flow speed in the air duct is increased, and the ability to absorb oil smoke is enhanced. This change not only improves the suction efficiency of the range hood, but also achieves the effect under the premise of maintaining a low noise level.

[0016] 2. The present invention adopts the design of the guide plate, which optimizes the original redundant air duct expansion area and directly guides the airflow from the wider smoking area to enter the fan frame efficiently. This design greatly reduces the vortex and swirl of the airflow in the expansion area, and significantly improves the suction effect. The expansion area is specially designed at the bottom edge of the guide plate, so that the airflow on the side of the fan frame can be smoothly introduced, thereby achieving a high-efficiency suction effect.

[0017] 3. The present invention adopts a design of installing a uniform wind plate in the central part of the fan. By going deep into the pressure extension zone and cooperating with the guide plate, the consistency of wind speed in the left, middle and right areas of the mesh cover is ensured, and the air flow distribution is accurately controlled. The problem of uneven local air flow rate caused by increasing the extension zone and shortening the expansion zone is effectively eliminated, thereby optimizing the suction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The air duct flow diagram of the traditional top-mounted side-suction range hood is given;

[0019] Figure 2 The front structure diagram of the traditional top-mounted side-suction range hood is given;

[0020] Figure 3 A front view of the range hood of the present invention is given;

[0021] Figure 4 A side view of the range hood of the present invention is given;

[0022] Figure 5 A structural diagram of the hidden portion of the shell of the range hood of the present invention is provided. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] like Figures 3 to 5 As shown, the range hood of the present invention follows the spatial layout of the air duct of the upper fan frame 200 with the lower side suction mesh cover 300, and the ratio of the width between the left and right sides of the fan frame 200 to the width between the left and right sides of the mesh cover 300 is 55-65%, which is in line with the design architecture of the traditional range hood. A symmetrical guide plate 100 is added to each of the left and right sides of the fan frame 200, and the guide plate 100 extends vertically downward from the corresponding bottom edge of the fan frame 200 to a distance of 20-50mm from the upper edge of the mesh cover 300. The area between the guide plates 100 on the left and right sides serves as the pressure extension area 410 of the air duct, and the size of the fan frame 200 from the upper edge of the mesh cover 300 is reduced from 114mm to the optimal 30mm, reducing the pressure expansion area 420 in the air duct, and the smoke entering from the smoking area of ​​the mesh cover 300 with a width of 682mm directly enters the fan frame 200 with a width of 400mm.

[0025] The lower edge of the guide plate 100 is connected to an outer flap 110 with a length of 10-15 mm. The lower edge of the outer flap 110 is higher than the upper edge of the mesh cover 300 to form a gap. The outer flaps 110 on the left and right sides serve as an outward trumpet-shaped pressure expansion zone 420 to guide the smoke on the left and right sides of the mesh cover 300 to smoothly enter the fan frame 200.

[0026] A baffle 500 is installed directly below the central part of the fan of the fan frame 200. The bottom width of the baffle 500 is 20 mm, the top width is 100 mm, and the top is installed at the lower edge of the fan volute 210 away from the rear panel 220. The bottom end of the baffle 500 is inclined downward and gradually extends toward the rear panel 220 to the direction adjacent to the rear panel 220 and deep into the pressure extension zone 410, serving as a uniform wind plate for balancing the wind speeds in the left, middle and right areas of the mesh cover 300.

[0027] The present invention substantially improves the design drawbacks of traditional range hoods. The key lies in combining fluid mechanics and acoustic principles to innovatively optimize the spatial layout of the fan system. A notable feature is that while keeping the distance between the volute 210 and the mesh cover 300 unchanged, the distance between the fan frame 200 and the mesh cover 300 is greatly shortened. This structural setting reduces the pressure loss in the air duct. Furthermore, through the improvement of this structure, the suction of the range hood is significantly enhanced. Specifically, the rational adjustment of the structure of the fan frame 200 in the present invention makes the airflow in the air duct more efficient, and ensures higher wind speed and suction while still maintaining a good control of the noise level. The test data shows that the wind speed on both sides can be increased from the original 6m / s to 8m / s, and the wind speed in the middle of the mesh cover 300 is also enhanced. The data jump highlights the improvement of the performance of the range hood. The design of the lower edge of the guide plate 100 echoes the expansion area, ensuring that the airflow smoothly enters the fan frame 200 from the mesh cover 300. The implementation scheme of the present invention has been verified through detailed tests, and the reduction of pressure loss and the increase of wind speed have been clearly numerically proved in actual tests. This not only represents an important improvement on the existing range hood design, but also marks the creation of new competitiveness in the range hood market, bringing users a more hygienic, quiet and efficient cooking environment.

[0028] In the present invention, the bottom end of the baffle 500 is inserted into the pressure extension zone 410 in an in-depth design. One way is to extend it to be flush with the bottom edge of the guide plate 100. Another way is that the height difference between the bottom edge of the guide plate 100 is within a set threshold (the size requirement is less than 5mm).

[0029] As an improved solution, the part of the baffle 500 located in the pressure extension area 410 is divided into a first section 510 relatively close to the rear panel 220 and a second section 520 relatively far from the rear panel 220 by a dividing line. The dividing line is perpendicular to the guide plate 100 and is located above the middle of the mesh cover 300. The first section 510 forms an inverted triangle structure that gradually converges toward the rear panel 220. The inverted triangle shape in the extension area forms a gradual increase in wind speed from the rear panel 220 to the upper edge of the mesh cover 300, guides the wind speed distribution, conforms to the diffusion law of boiler oil smoke, and enhances the oil smoke absorption effect.

[0030] As another improvement, the left and right edges of the baffle 500 are bent upward to form flanges. The width A between the left and right sides of the baffle 500 is configured so that the circumscribed circle cut angles α and β between the top of the baffle 500 and the outer edge of the volute 210 are both ≥15°, and the total length of this width dimension A is required to be larger than the width of the volute 210 after installation. The baffle 500 serves as an interception plate for oil dripping from the fan and a reused plate for the wind plate that balances the wind speed in the three areas of the left, middle and right of the mesh cover 300. Due to the inverted triangle design, the baffle 500 is a sheet metal part with a large top and a small bottom, and a folded oil-blocking structure on the left and right sides to prevent the oil droplets of the volute 210 from sliding onto the mesh cover 300 at the air inlet. The flange ensures that the oil droplets inside the baffle 500 will not slide off. The size of dimension A is required to ensure the acceptance rate of the oil droplets inside and outside the volute 210. The flange height cannot be too large. If it is too large, oil droplets will also be generated on the plane of the flange. Experiments have shown that the flange height is generally less than 6mm. In order to ensure that the oil droplets outside the baffle 500 can also flow smoothly into the cavity along the plane of the baffle 500 and will not fall off in the middle process, the installation angle of the baffle 500 tilted downward is required to be γ≥30°.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A range hood with an air inlet structure, wherein the range hood adopts an upper fan frame and a lower mesh cover as the spatial layout of the air duct. Features: At least one symmetrical guide plate is added to the left and right sides of the fan frame, each guide plate extends vertically downward from the corresponding bottom edge of the fan frame to a distance of 20-50 mm from the upper edge of the mesh cover, the area between the guide plates on the left and right sides serves as a pressure extension area of ​​the air duct, and the lower edge of the guide plate is provided with a bell-shaped pressure expansion area facing outward; A baffle is arranged directly below the fan of the fan frame, and the top end of the baffle is installed on the lower edge of the fan volute away from the rear panel, and the bottom end of the baffle is inclined downward and extends gradually towards the rear panel to the direction adjacent to the rear panel and deep into the pressure extension area. The baffle serves as a uniform wind plate for balancing the wind speed in the left, middle and right areas of the mesh cover.

2. The range hood according to claim 1, characterized in that: The bottom end of the baffle plate extends to be flush with the bottom edge of the guide plate or the height difference between the bottom end of the baffle plate and the bottom edge of the guide plate is within a set threshold.

3. The range hood according to claim 1, characterized in that: The portion of the baffle plate located in the pressure extension zone is divided into a first section relatively close to the rear panel and a second section relatively far from the rear panel by a dividing line, and the dividing line is perpendicular to the guide plate and located above the middle of the mesh cover; The first section forms an inverted triangle structure that gradually converges toward the rear panel.

4. The range hood according to claim 1, characterized in that: The lower edge of the guide plate is connected with an outer flap with a length of ≥10 mm, the lower edge of the outer flap is higher than the upper edge of the mesh cover to form a gap, and the area between the left and right outer flaps serves as the outward trumpet-shaped pressure expansion zone.

5. The range hood according to claim 1, characterized in that: The ratio of the width between the left and right sides of the fan frame to the width between the left and right sides of the mesh cover is 55-65%.

6. The range hood according to claim 1, characterized in that: The left and right edges of the baffle are bent upward to form flanges, and the width A between the left and right sides of the baffle is configured so that the circumscribed circle cutting angles α and β between the top of the baffle and the outer edge of the volute are both ≥15°. The baffle serves as an interception plate for oil dripping from the fan and a reused plate of the wind uniformity plate for balancing the wind speed in the left, middle and right areas of the mesh cover.

7. The range hood according to claim 6, characterized in that: The baffle is installed at an angle γ≥30° with an inclination downward.

8. The range hood according to claim 6, characterized in that: The flange height is less than 6 mm.

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