Range hood with flow guide air inlet structure

Abstract

The utility model relates to a range hood with a flow guide air inlet structure, which adopts the spatial layout that an upper fan frame is matched with a side suction type mesh enclosure to serve as an air duct, and at least one symmetrical flow guide plate is additionally arranged on each of the left side and the right side of the fan frame; each drainage plate vertically extends downwards from the corresponding bottom edge of the fan frame to the position 20-50 mm away from the upper edge of the net cover, 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] This utility model relates to the field of range hoods, and in particular to a range hood with a guide air inlet structure. Background Technology

[0002] In today's kitchen appliance market, with shrinking living spaces and increasing building density, effective fume extraction and noise control have become key considerations for users when purchasing range hoods.

[0003] Traditional range hoods with top-mounted fan frames and side-suction mesh covers have the fan frame positioned above the mesh cover, resulting in a specific airflow path. Figure 1 As shown, the smoke inlet faces outwards and away from the user, effectively reducing noise; Figure 2 As shown, the grille is angled against the wall, with a total air inlet width of 682mm and a fan frame width of 405mm, positioned above the grille. The fan frame is 114mm from the top edge of the grille opening; this area directly serves as the pressure expansion zone. In traditional top-mounted range hood designs, the fan system is installed above the air inlet grille. While this design addresses noise reduction, it sacrifices suction efficiency due to increased pressure loss in the duct. This contradiction has become a technical obstacle to improving range hood performance. Market research shows that users have high expectations for the suction power of range hoods; however, traditional designs often fail to achieve the desired results. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a range hood with a guide air inlet structure.

[0005] This utility model of a range hood uses an upper-mounted fan frame paired with a lower-mounted mesh cover as the spatial layout of the air duct. At least one symmetrical air intake plate is added to each of the left and right sides of the fan frame. Each air intake plate extends vertically downward from the corresponding bottom edge of the fan frame to a distance of 20-50mm from the upper edge of the mesh cover. The area between the air intake plates on the left and right sides serves as the pressure extension zone of the air duct. The lower edge of the air intake plate is provided with an outward-flaring pressure expansion zone. A baffle is provided directly below the fan of the fan frame. The top of the baffle is installed on the lower edge of the fan casing away from the rear panel. The bottom of the baffle extends downward at an angle, gradually approaching the rear panel and penetrating into the pressure extension zone. The baffle serves as a wind equalization plate to balance the wind speed in the left, middle, and right areas of the mesh cover.

[0006] The intermediate pressing assembly provided by this utility model also includes the following auxiliary technical solutions:

[0007] Among them, the bottom end of the baffle extends to be level with the lower edge of the diversion plate or the height difference between the baffle and the lower edge of the diversion plate is within a set threshold.

[0008] 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 from the rear panel by a dividing line. The dividing line is perpendicular to the diversion plate and located above the middle of the net cover. The first section forms an inverted triangular structure that gradually narrows towards the rear panel.

[0009] The lower edge of the drainage plate is connected to 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. The area between the outer flaps on the left and right sides serves as a pressure expansion zone in the shape of an outward flare.

[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] The left and right edges of the baffle are bent upwards to form flanges. The width A between the left and right sides of the baffle is configured such that the circumscribed circle α and β of the top of the baffle and the outer edge of the volute are both ≥15°. The baffle is a combined plate that intercepts oil dripping from the fan and equalizes the wind speed in the left, middle and right areas of the equalization screen.

[0012] Among them, the installation angle γ of the baffle tilting downward is ≥30°.

[0013] The flange height is less than 6mm.

[0014] The implementation of this utility model has the following technical effects:

[0015] 1. This utility model improves the spatial layout of the fan frame and air inlet, adjusting the traditional design of the fan frame being far from the upper edge of the mesh cover to a distance of only 20-50mm, significantly reducing pressure loss caused by distance. By reducing the space between the fan frame and the air inlet, the airflow velocity in the duct is increased, enhancing the ability to adsorb cooking fumes. This modification not only improves the suction efficiency of the range hood but also achieves the effect while maintaining a low noise level.

[0016] 2. This utility model employs a deflector plate design. This deflector plate optimizes the previously redundant airflow expansion area, directly guiding airflow from the wider smoke extraction area into the fan frame with high efficiency. This design significantly reduces airflow eddies and swirling within the expansion area, substantially improving suction power. The lower edge of the deflector plate is specially designed with an expansion area, allowing airflow from the sides of the fan frame to be smoothly introduced, thereby achieving a highly efficient suction effect.

[0017] 3. This utility model adopts a design of installing a wind equalization plate in the central part of the fan. By going deep into the pressure extension zone and cooperating with the diversion plate, it ensures the consistency of wind speed in the left, middle and right areas of the mesh cover, realizes precise control of airflow distribution, and effectively eliminates the problem of uneven local airflow rate caused by increasing the extension zone and shortening the expansion zone, thereby optimizing the suction effect. Attached Figure Description

[0018] Figure 1 A schematic diagram of the airflow in a traditional top-mounted side-suction range hood is provided.

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

[0020] Figure 3 A front view of the range hood of this utility model is shown;

[0021] Figure 4 A side view of the range hood of this utility model is shown;

[0022] Figure 5 A structural diagram of the concealed outer shell of the range hood of this utility model is provided. Detailed Implementation

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

[0024] like Figures 3 to 5 As shown, the range hood of this utility model adopts the spatial layout of an upper-mounted fan frame 200 and a lower-mounted side-suction mesh cover 300. 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 conforms to the traditional range hood design structure. On the left and right sides of the fan frame 200, a symmetrical diversion plate 100 is added. The diversion 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 diversion plates 100 on the left and right sides serves as the pressure extension zone 410 of the air duct, reducing the distance between the fan frame 200 and the upper edge of the mesh cover 300 opening from 114mm to an optimal 30mm, reducing the pressure expansion zone 420 in the air duct. The smoke entering from the 682mm wide smoke extraction zone of the mesh cover 300 directly enters the 400mm wide fan frame 200.

[0025] The lower edge of the diversion plate 100 is connected to an outer flap 110 with a length of 10-15mm. The lower edge of the outer flap 110 is higher than the upper edge of the mesh cover 300 to form a gap. The space between the outer flaps 110 on the left and right sides serves as an outward flared pressure expansion zone 420, which guides the flue gas 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 center of the fan frame 200. The baffle 500 has a bottom width of 20mm and a top width of 100mm. The top is installed on the lower edge of the fan volute 210 away from the rear panel 220. The bottom of the baffle 500 is inclined downward and extends towards the rear panel 220 to the side of the rear panel 220 and into the pressure extension zone 410, serving as a wind equalization plate for the wind speed in the left, middle and right areas of the equalization mesh cover 300.

[0027] This invention substantially improves upon the design shortcomings of traditional range hoods. The key lies in its innovative optimization of the spatial layout of the fan system, combining principles of fluid mechanics and acoustics. A significant feature is the substantial reduction in the distance between the fan frame 200 and the mesh cover 300 while maintaining the same distance between the volute 210 and the mesh cover 300. This structural design reduces pressure loss in the duct. Consequently, this structural improvement significantly enhances the suction power of the range hood. Specifically, the rational adjustment of the fan frame 200 structure in this invention makes the airflow in the duct more efficient. While maintaining good noise control, it ensures higher wind speed and suction power. Test data shows that the wind speed on both sides increased from 6 m / s to 8 m / s, and the wind speed in the middle of the mesh cover 300 also increased. This significant improvement highlights the enhanced performance of the range hood. The design of the lower edge of the guide plate 100, echoing the expansion area, ensures smooth airflow from the mesh cover 300 into the fan frame 200. The implementation scheme of this utility model has been verified through detailed experiments, and the reduction in pressure loss and the increase in wind speed have been clearly demonstrated in actual tests. This not only signifies a major improvement over existing range hood designs, 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 this utility model, the bottom end of the baffle 500 is inserted into the pressure extension area 410 in two ways: one is to extend it to be flush with the lower edge of the diversion plate 100, and the other is to ensure that the height difference between the baffle 500 and the lower edge of the diversion plate 100 is within a set threshold (the size requirement is less than 5mm).

[0029] As an improvement, the portion of the baffle 500 within the pressure extension zone 410 is divided by a dividing line into a first segment 510 relatively closer to the rear enclosure 220 and a second segment 520 relatively farther away from the rear enclosure 220. The dividing line is perpendicular to the guide plate 100 and located above the center of the mesh cover 300. The first segment 510 forms an inverted triangular structure that gradually narrows towards the rear enclosure 220. The inverted triangular shape within the extension zone creates a gradual increase in wind speed from the rear enclosure 220 to the upper edge of the mesh cover 300, guiding the wind speed distribution, conforming to the diffusion pattern of boiler fumes, and enhancing the fume extraction effect.

[0030] As an alternative improvement, the left and right edges of the baffle 500 are bent upwards to form flanges. The width A between the left and right sides of the baffle 500 is configured such that the circumscribed angles α and β between the top of the baffle 500 and the outer edge of the volute 210 are both ≥15°. Furthermore, the total length of this width dimension A must be larger than the width of the volute 210 after installation. The baffle 500 serves as a combined plate for intercepting oil drips from the fan and for equalizing the airflow in the left, middle, and right zones of the equalizing mesh cover 300. Due to its inverted triangular design, the baffle 500 is a sheet metal part that is larger at the top and smaller at the bottom, with folded edges on both sides to intercept oil drips. This prevents oil droplets from the volute 210 from sliding onto the mesh cover 300 at the air inlet. The flanges ensure that oil droplets inside the baffle 500 do not slide off. The size of dimension A must ensure a high acceptance rate for oil droplets inside and outside the volute 210. The flange height cannot be too large; otherwise, oil droplets will also form on the flat surface of the flange. Experiments have shown that the flange height is generally less than 6mm. To ensure that the oil droplets on the outside of the baffle 500 can flow smoothly into the cavity along the plane of the baffle 500 without falling off in the process, the baffle 500 must be installed at an angle of γ≥30° with the baffle 500 tilted downwards.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A range hood with a flow guide air inlet structure, the range hood adopts an upper fan frame combined with a lower mesh cover as a spatial layout of an air duct, characterized in that: at least one symmetric flow guide plate is added to each of the left and right sides of the fan frame, each flow guide plate vertically extends 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 flow guide plates on the left and right sides serves as a pressure extension zone of the air duct, and the lower edge of the flow guide plate is provided with an outward flared pressure expansion zone; a baffle is arranged directly below the fan of the fan frame, the top end of the baffle is mounted to the lower edge of the fan volute away from the back plate, the bottom end of the baffle extends obliquely downward to the back plate and deep into the pressure extension zone, and the baffle serves as a uniform air plate for balancing the air speed in the left, middle and right areas of the mesh cover. The bottom end of the baffle extends to the same level as the lower edge of the flow guide plate or the height difference between them is within a set threshold.

3. The range hood according to claim 1, characterized in that: the part of the baffle located in the pressure extension zone is divided into a first section close to the back plate and a second section away from the back plate by a demarcation line, the demarcation line is perpendicular to the flow guide plate and located above the middle of the mesh cover; and the first section forms an inverted triangular structure gradually converging towards the back plate.

4. The range hood according to claim 1, characterized in that: the lower edge of the flow guide plate is connected with an everted plate with a length of ≥10 mm, the lower edge of the everted plate is higher than the upper edge of the mesh cover to form a gap, and the everted plates on the left and right sides serve as the outward flared pressure expansion zone.

2. The 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%. The left and right edges of the baffle are bent upwards to form a turned-up edge, the width A between the left and right edges of the baffle is configured such that the tangent angles α and β of the top end of the baffle with the circumscribed circle of the outer edge of the volute are both ≥15°, and the baffle serves as a multipurpose plate for intercepting oil drops from the fan and balancing the air speed in the left, middle and right areas of the mesh cover. The installation angle γ of the baffle obliquely downward is ≥30°. The height of the turned-up edge is less than 6 mm. ​ ​ 5. The hood according to claim 1, characterized in that: ​ 6. The hood according to claim 1, characterized in that: ​ 7. The hood according to claim 6, characterized in that: ​ 8. The hood according to claim 6, characterized in that: ​

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