Cooking fume removal cover

Abstract

The utility model discloses an oil smoke removal cover which comprises an oil smoke separation shell, a motor and an oil smoke separation disc, the motor and the oil smoke separation disc are located in the shell, the oil smoke separation disc is controlled by the motor to rotate, an air inlet is formed in the front of the oil smoke separation disc, and a back plate corresponding to the oil smoke separation disc is arranged in the oil smoke separation shell. The ratio of the rotating speed of the motor to the diameter of the oil-smoke separation disc is 1.3-2.8, and the ratio of the distance from the oil-smoke separation disc to the back plate to the diameter of the oil-smoke separation disc is 0.2-0.5. By controlling the rotating speed and the diameter of the oil-smoke separation disc, friction between wind and the oil-smoke separation disc is reduced, and noise is reduced. The noise reduction cover is used for blocking and reflecting noise in places where the noise is large, and the noise is prevented from being spread to people.

Description

Technical Field

[0001] This utility model relates to the technical field of kitchen exhaust equipment, and in particular to an oil-removing fume hood. Background Technology

[0002] Currently, the household range hoods or commercial smoke exhaust systems used on the market are essentially composed of a smoke collection hood, an air duct, and a fan, only differing in shape, size, and power.

[0003] After a period of use, the air ducts and fans are prone to accumulating grease, leading to a significant decrease in smoke extraction efficiency and requiring frequent manual cleaning. To address this issue, existing technology involves installing at least one high-speed rotating oil fume separation disc, commonly known as an oil-slinging disc or dynamic interceptor, at the air inlet of the smoke hood. The principle is as follows: a motor drives the high-speed rotating oil fume separation disc, and spokes evenly distributed on the disc cut and intercept oil fume molecules, adsorbing them onto the spokes. These molecules are then centrifugally ejected, thus achieving oil fume separation and ensuring that the downstream air ducts and fans are not contaminated with oil fume, eliminating the need for frequent cleaning. Its effect is significantly better than traditional stationary oil-intercepting screens, but it introduces a new problem: relatively high noise levels.

[0004] Chinese patent application number CN201020056752.7 discloses a dynamic interception and recovery range hood for home kitchens. It uses at least one dynamic physical shield to separate oil fumes at the hood opening, which is effective, but the noise is relatively loud. This is because the high-speed rotating dynamic interception disc sweeps the wind, generating high-frequency noise, commonly known as "wind howling". Although there is a decorative oil fumes filter in front, it is large and open, so it is basically ineffective. This is also the reason why this product has been difficult to promote in the market.

[0005] Chinese patent application number 202121807181.0 discloses a rectangular commercial kitchen fume purification device, which is actually a fume hood with oil fume separation. The fume hood generates a lot of noise due to the high-speed rotating oil fume separation disc, and no noise reduction treatment is carried out, which has a certain impact on the chef. At the same time, the device has a complex structure and large size, and the production, transportation and installation costs are relatively high, which is why the product is difficult to mass-produce and market. Utility Model Content

[0006] To address the issue of excessive noise caused by the aforementioned oil fume separation disc, this invention proposes an oil fume hood that effectively reduces noise through optimized structural design.

[0007] The technical solution adopted in this utility model is to design an oil fume hood, including an oil fume separation shell, which connects an air inlet and an air outlet. An oil fume separation disc is disposed inside the oil fume separation shell between the air inlet and the air outlet. The oil fume separation disc has oil fume flow holes. The oil fume separation disc is rotated by a rotating device to separate the passing oil fumes. A silencer cover is disposed in front of the oil fume separation disc, and the air inlet is opened on the silencer cover. The ratio of the rotational speed of the oil fume separation disc to its diameter is 1.3 to 2. 8. The unit of rotation speed of the oil fume separation disc is revolutions per minute, the unit of diameter of the oil fume separation disc is millimeters, the ratio of the distance from the oil fume separation disc to the back plate of the oil fume separation housing to the diameter of the oil fume separation disc is 0.2 to 0.5; the diameter of the air inlet is smaller than the diameter of the oil fume separation disc, the difference between the diameter of the circle corresponding to the effective air inlet area converted into a circular area and the diameter of the oil fume separation disc is 60 to 260 millimeters; the angle between the line connecting the edge of the air inlet to the edge of the oil fume separation disc and the oil fume separation disc is 26° to 68°.

[0008] In some embodiments, the fume separation housing has a back plate corresponding to the fume separation disc, and the silencing cover is arranged parallel to the back plate.

[0009] In some embodiments, the air inlet and air outlet are oriented perpendicular to each other.

[0010] In some embodiments, the air inlet is provided with a protective mesh, the opening ratio of which is 40-100%.

[0011] In some embodiments, a reinforcing ring is fixed to the edge of the fume separation disc, the thickness of the reinforcing ring in the radial direction of the fume separation disc is 0.8 to 4 mm, and the width of the reinforcing ring in the axial direction of the fume separation disc is 8 to 40 mm.

[0012] In some embodiments, one end of the axially extending reinforcing ring is connected to the oil fume separation disc.

[0013] In some embodiments, the other end of the reinforcing ring faces the air inlet.

[0014] In some embodiments, the diameter of the fume separator is 360–600 mm.

[0015] In some embodiments, the oil fume separation housing is provided with a coaxial oil fume separation cylinder sleeved outside the oil fume separation disc. The oil adsorbed on the oil fume separation disc is thrown onto the oil fume separation cylinder, and the bottom of the oil fume separation cylinder is provided with an oil outlet. The oil flows through the oil outlet and then into the oil collection tank below the housing.

[0016] In some embodiments, an upper smoke baffle that bends downwards is provided above the outside of the air inlet, and side smoke baffles are provided on both sides of the outside of the air inlet.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention reduces friction between the oil fume separation disc and the airflow by controlling the rotation speed and diameter of the disc. While the outer edge of the disc generates significant noise, the soundproof cover blocks this noise, reflecting it into the housing and preventing its propagation towards people. Smaller sound waves near the center of the disc diffusely reflect through the air inlet to the fume hood. The narrow inlet and the opposite direction of the propagation further reduce the noise reaching people without affecting oil removal or airflow. This solves the noise problem generated by the oil fume separation disc during operation. Furthermore, the modular assembly of the housing and baffle plate using screws significantly reduces production, transportation, and installation costs. It addresses the challenges of complex structures, large sizes, and high production and installation costs associated with current commercial fume hoods, making it suitable for large-scale production and promotion with broad market prospects. Attached Figure Description

[0019] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings. To illustrate the details and facilitate understanding of its principles, the drawings are not necessarily to scale, and similar reference numerals may describe similar components in different views. The accompanying drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Wherein:

[0020] Figure 1 This is a cross-sectional schematic diagram of the range hood.

[0021] Figure 2 This is a schematic diagram of an oil fume separator.

[0022] Figure 3 yes Figure 2 A schematic diagram of the AA section.

[0023] Figure 4 It is a schematic diagram of multiple oil-removing fume hoods arranged side by side and connected as one unit.

[0024] Figure 5 This is a three-dimensional exploded view of a fume hood with two separation discs.

[0025] In the diagram: 1. Oil fume separation housing; 2. Motor; 3. Oil fume separation disc; 31. Spokes; 4. Air inlet; 5. Sound-absorbing material; 6. Silencing cover; 7. Air outlet; 8. Wiring; 9. Oil collection trough; 10. Upper smoke baffle; 11. Back plate; 12. Reinforcing ring; 13. Oil fume separation cylinder; 14. Central disc; 15. Air duct; 16. Fan; 17. Side smoke baffle. Detailed Implementation

[0026] The following are specific embodiments of this utility model, and the technical solution of this utility model will be further described with reference to the accompanying drawings. However, this utility model is not limited to these embodiments, and the following embodiments do not limit the utility model involved in the claims. In addition, all combinations of features described in the embodiments are not necessarily necessary for the solution of the utility model.

[0027] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] Example

[0029] like Figure 1 , 2 As shown in Figures 3 and 5, a fume hood includes an oil fume separation housing 1 located within a housing. The oil fume separation housing 1 is connected to an air inlet 4 and an air outlet 7. The air outlet 7 is usually connected to a fan so that oil fumes enter the oil fume separation housing 1 from the air inlet 4 and are discharged from the air outlet 7. An oil fume separation disc 3 is provided inside the oil fume separation housing 1 between the air inlet 4 and the air outlet 7. An oil fume flow hole is provided on the oil fume separation disc 3. The oil fume separation disc 3 is rotated by a rotating device to separate the passing oil fumes. A silencer cover 6 is provided in front of the oil fume separation disc 3. The air inlet 4 is located at the center of the silencer cover 6, corresponding to the center of the separation disc. When the fume separation disc 3 rotates, it generates centrifugal force on the airflow, causing the airflow to move from the center towards the edge of the disc. This reduces the pressure between the air inlet 4 and the disc, creating an adsorption effect on the air inlet 4. Furthermore, the presence of the silencer cover 6 restricts airflow to the cavity behind the fume separation disc 3, resulting in a certain airflow velocity between them. This creates a negative pressure between the disc and the cover, subjecting the silencer cover 6 to atmospheric pressure. This pressure fixes the area near the air inlet edge of the silencer cover 6 relative to the fume separation housing 1, preventing vibration and excessive noise. Although the rotation of the disc increases pressure at its edge, the silencer cover at that location is securely fixed to the housing via bolts, preventing vibration noise. Moreover, the silencer cover effectively blocks noise generated at the disc's edge, reflecting it into the housing and preventing its propagation towards people.

[0030] The oil fume separation housing 1 is provided with a coaxial oil fume separation cylinder 13 that is sleeved outside the oil fume separation disc 3. When the oil fume passes through the oil fume separation disc 3, the rotating oil fume separation disc 3 throws the oil in the oil fume onto the oil fume separation cylinder 13, while the flue gas is discharged through the air outlet 7, thereby realizing the separation of oil fume.

[0031] The rotating device is a motor 2 installed inside the oil fume separation housing 1. The oil fume separation disc 3 is connected to the rotating shaft of the motor 2. In this embodiment, the oil fume separation disc 3 includes several spokes 31 radially distributed around the rotating shaft. The gaps between the spokes 31 are the oil fume flow holes.

[0032] The fume separation housing 1 has a back plate 11 corresponding to the fume separation disc 3, and the motor 2 is located between the back plate 11 and the fume separation disc 3. The motor 2 and the fume separation disc 3 are located in a cavity within the fume separation housing 1, which is the fume separation chamber. Sound-absorbing material 5 is provided on the back plate 11.

[0033] The diameter of the oil fume separation disc is 360–600 mm.

[0034] The ratio of the motor speed to the diameter of the fume separation disc is 1.3 to 2.8. The unit of the fume separation disc speed is revolutions per minute (rpm), and the unit of the fume separation disc diameter is millimeters (mm). That is, the ratio of the motor speed (revolutions per minute) to the fume separation disc diameter (mm) is 1.3 to 2.8. Once the motor speed is determined, the diameter of the fume separation disc needs to be within a suitable range to achieve a good noise reduction effect. The faster the fume separation disc speed, the greater the noise generated. Similarly, the larger the diameter of the fume separation disc, the greater the noise; the smaller the diameter, the lower the noise, but the smaller the airflow. To ensure airflow while reducing noise, controlling the ratio of the motor speed (revolutions per minute) to the fume separation disc diameter (mm) to be 1.3 to 2.8 is preferable. A more optimal solution is: when the fume separation disc diameter is large, this ratio should be 1.3 to 2; when the fume separation disc diameter is small, this ratio should be 2 to 2.8.

[0035] The ratio of the distance from the fume separation disc to the back plate to the diameter of the fume separation disc is 0.2 to 0.5. That is, the ratio of the distance from the center point of the fume separation disc along the central axis of the fume separation disc to the back plate of the fume separation housing to the diameter of the fume separation disc is 0.2 to 0.5. The ratio of the distance from the fume separation disc to the back plate to the diameter of the fume separation disc should not be too small or too large, so that the noise can be absorbed by the cavity.

[0036] The farther the fume separator is from a person, the weaker the sound waves become when they reach that person. However, the fume separator should not be too close to the back panel of the casing, otherwise it will affect the ventilation and separation effect. Therefore, the optimal ratio of the distance from the center point of the fume separator along the central axis of the fume separator to the back panel to the diameter of the separator is 0.2 to 0.5.

[0037] To prevent noise from propagating from the separation chamber, a silencer cover 6 is installed at the air inlet 4. The air inlet 4 on the silencer cover 6 is much smaller than the oil fume separation disc 3 that generates noise, creating an anti-horn effect to reduce the outward transmission of sound waves. However, it cannot be too small, otherwise it will affect the ventilation. If the air inlet is circular, the difference between the diameter of the oil fume separation disc and the diameter of the air inlet should be 60–260 mm to ensure an air velocity of 4–8 m / s.

[0038] To prevent foreign objects from entering, the air inlet is provided with a protective mesh. The opening rate of the protective mesh is 40-100%. A protective grid or mesh can be set at the air inlet as a protective mesh. In this embodiment, a mesh is opened in a certain area on the silencer cover as an air inlet.

[0039] The silencing cover is arranged parallel to the back plate so that noise is reflected and superimposed between the silencing cover and the back plate, thus canceling out some of the energy.

[0040] The diameter of the air inlet is smaller than the diameter of the fume separation disc. The difference between the diameter of the effective air intake area of ​​the air inlet (converted to a circular area) and the diameter of the fume separation disc is 60–260 mm. That is, if the air inlet is irregularly shaped, the difference between its diameter and the diameter of the fume separation disc is 60–260 mm, calculated based on the effective air intake area. Furthermore, the silencer cover should not be too close to the fume separation disc, otherwise it will affect the air extraction; nor should it be too far away, otherwise it will affect noise reduction and smoke collection.

[0041] To ensure that the air inlet 4 does not face people and to reduce the impact of noise on people, the front panel and back panel 11 of the housing are parallel, and the air inlet 4 is perpendicular to the air outlet 7, so that the noise is partially canceled out inside the cavity.

[0042] The angle α between the line 8 connecting the edge of the air inlet to the edge of the fume separation disc and the fume separation disc is 26° to 68°. That is, a line drawn from any point on the outer edge of the circular air inlet on the silencer cover to the outer ring of the fume separation disc, and the angle formed between this line and the fume separation disc is 26° to 68°.

[0043] A downward-bent upper smoke baffle is provided above the outside of the air inlet 4. Upper smoke baffles 10 are provided above and in front of the outside of the air inlet 4 to block and eliminate noise reflected from the air inlet 4. The upper smoke baffle 10 can also be a plate that can rotate and adjust its angle relative to the main body of the oil fume separation housing 1, allowing users to adjust it according to their actual needs. Side smoke baffles 17 are provided on both sides of the outside of the air inlet. The side smoke baffles and the upper smoke baffle form a cover located in front of the air inlet, covering the area in front of the air inlet to facilitate the entry of smoke into the air inlet.

[0044] The upper smoke baffle 10 is detachably connected to the oil fume separation housing 1. For example, the upper smoke baffle 10 and the oil fume separation housing 1 can be detachably connected by splicing, which facilitates transportation and installation, and also facilitates the splicing of multiple oil fume hoods.

[0045] An oil collection tank 9 is provided below the oil fume separation plate 3 to collect the oil separated from the oil fume.

[0046] The cooking fumes rise into the fume chamber, which consists of the upper fume baffle 10 and the separation shell. Due to the action of the external fan and the separation disc, the fumes in the fume chamber enter the fume separation shell 1 through the air inlet 4 on the silencer cover 6. The high-speed rotating fume separation disc 3 sweeps the passing fumes, causing the oil to be adsorbed onto the fume separation disc 3 and thrown out onto the inner wall of the fume separation cylinder 13 by centrifugal force. Due to gravity, the oil flows into the oil collection tank 9 through the oil outlet at the bottom of the fume separation cylinder 13. Clean air enters the air duct system through the air outlet 7 at the top of the separation shell.

[0047] A reinforcing ring is fixed to the edge of the fume separation disc. The thickness of the reinforcing ring in the radial direction of the fume separation disc is 0.8 to 4 mm, for example, 1.5 mm or 2 mm. The width of the reinforcing ring in the axial direction of the fume separation disc is 8 to 40 mm. The reinforcing ring is connected to the end of the spokes, which fixes the end of the spokes and prevents noise caused by deformation when the separation disc rotates at high speed.

[0048] The traditional oil fume separation disc 3 has a small radius, so it rotates at a high speed. In order to reduce resistance, its reinforcing ring is thin. When the separation disc rotates at high speed, the narrow edge is prone to generating noise when it interacts with the air. At the same time, because the traditional reinforcing ring is thin, it only serves to connect the ends of the spokes 31 and cannot prevent the edge of the separation disc from warping and vibrating when it rotates.

[0049] In this embodiment, the reinforcing ring 12 is thinner in the radial direction and wider in the axial direction, which provides better protection against warping and deformation of the disc edge under the same mass, and can prevent the end from vibrating during rotation, thus significantly and effectively reducing "wind howling".

[0050] Furthermore, one end of the reinforcing ring 12 is connected to the oil fume separation disc 3 in the axial direction, that is, the spoke 31 is connected to one end face of the reinforcing ring 12 in the axial direction, so that the reinforcing ring 12 has a stronger ability to resist the deformation of the oil fume separation disc 3.

[0051] The other end of the reinforcing ring 12 faces the air inlet 4, meaning the end face of the reinforcing ring 12 not connected to the spokes 31 faces the air inlet 4. This positions the reinforcing ring 12 between the oil fume separation disc 3 and the silencer cover 6. In this way, the reinforcing ring 12 helps to block the flow of flue gas entering from the air inlet along the radial direction of the oil fume separation disc 3, allowing the oil fume to pass between the spokes 31, thus facilitating the adhesion of oil to the spokes 31. In other words, the reinforcing ring 12 obstructs the radial flow of airflow, preventing airflow from passing through the gap between the oil fume separation cylinder 13 and the oil fume separation disc 3.

[0052] Since the spokes on the oil fume separation disc are connected to the end of the reinforcing ring instead of the middle, the influence of the reinforcing ring on the outward splashing of oil from the separation disc can be reduced. This facilitates the oil being splashed out of the separation disc along the spokes and reduces the obstruction of the cylindrical reinforcing ring to the splashing of oil. In other words, this design of the reinforcing ring not only improves the strength but also prevents oil fumes from short-circuiting out from the side, while also avoiding obstruction to the splashing of oil.

[0053] The oil fume separation disc 3 is provided with a central disc 14 corresponding to the air inlet 4, so that the oil fumes entering from the air inlet 4 are blocked by the central disc 14 and flow radially along the oil fume separation disc 3. That is, the central disc 14 plays the role of guiding and dispersing the oil fumes radially.

[0054] like Figure 4 As shown, when the fume extractor hood of this embodiment is used in spaces with high levels of cooking fumes, such as hotels and restaurants, multiple fume extractor hoods can be connected side-by-side to form a large fume collection hood. This hood is then connected to a high-powered fan 16 via duct 15, thus meeting the fume separation needs of larger commercial spaces. When the fume extractor hood is used in homes with lower levels of cooking fumes, a fan can be connected to the hood's outlet, integrating the fume extractor hood and fan into a single range hood.

[0055] The method for manufacturing the oil-removing fume hood is as follows:

[0056] First, determine the number of oil fume separation discs based on the oil fume flow rate;

[0057] Then, the lengths of the oil fume separation shell and the upper smoke baffle are determined according to the number of oil fume separation discs;

[0058] Then, the oil fume separation cylinder, oil fume separation disc, and silencer cover are installed on the oil fume separation housing, with the oil fume separation disc arranged along the length of the oil fume separation housing;

[0059] Finally, the upper smoke baffle is installed above the oil fume separation housing, and the side smoke baffles are installed on both sides of the oil fume separation housing, thereby forming an oil fume hood with multiple oil fume separation discs.

[0060] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A fume hood, comprising a fume separation shell and a fume baffle, wherein the fume separation shell connects an air inlet and an air outlet, and an fume separation disc is disposed within the fume separation shell between the air inlet and the air outlet, the fume separation disc having fume flow holes, and the fume separation disc being rotated by a rotating device to separate the passing fume, characterized in that, A silencer cover is provided in front of the fume separation disc, and the air inlet is located on the silencer cover; the ratio of the rotation speed of the fume separation disc to its diameter is 1.3 to 2.8, the unit of rotation speed is revolutions per minute, the unit of diameter is millimeters, and the ratio of the distance from the fume separation disc to the back plate of the fume separation housing to its diameter is 0.2 to 0.5; the diameter of the air inlet is smaller than the diameter of the fume separation disc, and the difference between the diameter of the effective air inlet area converted into a circular area and the diameter of the fume separation disc is 60 to 260 millimeters; the angle between the line connecting the edge of the air inlet to the edge of the fume separation disc and the fume separation disc is 26° to 68°.

2. The oil-removing fume hood according to claim 1, characterized in that, The oil fume separation housing has a back plate corresponding to the oil fume separation disc, and the silencing cover is arranged parallel to the back plate.

3. The oil-removing fume hood according to claim 1 or 2, characterized in that, The air inlet and air outlet are oriented perpendicular to each other.

4. The oil-removing fume hood according to claim 1, characterized in that, The air inlet is provided with a protective mesh, and the opening rate of the protective mesh is 40-100%.

5. The oil-removing fume hood according to claim 1, characterized in that, A reinforcing ring is fixed to the edge of the oil fume separation disc. The thickness of the reinforcing ring in the radial direction of the oil fume separation disc is 0.8 to 4 mm, and the width of the reinforcing ring in the axial direction of the oil fume separation disc is 8 to 40 mm.

6. The oil-removing fume hood according to claim 5, characterized in that, One end of the reinforcing ring is connected to the oil fume separation disc along the axial direction.

7. The oil-removing fume hood according to claim 6, characterized in that, The other end of the reinforcing ring faces the air inlet.

8. The oil-removing fume hood according to claim 1, characterized in that, The diameter of the oil fume separation disc is 360–600 mm.

9. The oil-removing fume hood according to claim 1, characterized in that, The oil fume separation housing is provided with a coaxial oil fume separation cylinder that is sleeved outside the oil fume separation disc. When the oil fume passes through the oil fume separation disc, the rotating oil fume separation disc throws the oil in the oil fume onto the oil fume separation cylinder. The bottom of the oil fume separation cylinder is provided with an oil outlet.

10. The oil-removing fume hood according to claim 1, characterized in that, An upper smoke baffle that bends downward is provided above the outside of the air inlet, and side smoke baffles are provided on both sides of the outside of the air inlet.

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