Centrifugal fan for range hood

Abstract

The utility model discloses a centrifugal fan for a range hood, which is characterized in that a negative ion generator is used for decomposing harmful substances in oil smoke and converting the harmful substances into harmless water and carbon dioxide, and meanwhile, negative ions are generated, so that the air is effectively purified; meanwhile, when the oil smoke flows into the fan, the inner barrel and the second blade also rotate along with the inner barrel, so that the oil smoke discharged in the rotating process of the first blade has a reverse adsorption effect, and oil molecules and water molecules (including water decomposed by the negative-ion generator) with relatively high density in the oil smoke can be easily adsorbed to the middle part of a wind wheel; and the oil smoke enters the storage cavity through the strip-shaped air inlet holes of the inner cylinder and is discharged, so that the content of oil molecules in the discharged oil smoke is reduced, and finally, the effect of separating the oil molecules and water molecules with relatively high density in the oil smoke is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and particularly relates to a centrifugal fan for a range hood. Background Art

[0002] A range hood is a kitchen appliance for purifying the kitchen environment. It is installed above the kitchen stove and can quickly extract and discharge the waste generated by the stove combustion and the harmful oil fumes generated during the cooking process outdoors. At the same time, the oil fumes are condensed and collected to reduce pollution. Due to living and business needs, some buildings and commercial places need to set up kitchens or carry out cooking activities. However, due to various reasons, these buildings or commercial places originally did not have a common flue and could not add a common flue, nor could they directly discharge the kitchen catering oil fume gas outdoors. How to set up a kitchen in these places without affecting the indoor air environment has become a major problem for setting up kitchens and carrying out cooking activities in these places.

[0003] For example, the Chinese patent with the application number 2024101566316 and the application date of February 4, 2024, discloses "An Inner-Circulation Air Purification Cover for a Range Hood", which realizes the filtration and purification of oil fume gas through a filter grille (mainly the activated carbon filter cotton inside). However, during the filtration and purification process of the oil mist in the oil fume gas, it is very easy to adhere to the activated carbon filter cotton of the filter grille, thereby affecting the purification efficiency of the filter grille for the oil fume. Content of the Utility Model

[0004] The purpose of the utility model is to provide a centrifugal fan for a range hood, which has the function of separating the denser oil molecules and water molecules in the oil fume.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions: A centrifugal fan for a range hood includes a volute, a motor arranged on the volute, and an impeller arranged on the output shaft of the motor. The motor is an outer-rotor motor; the impeller includes a chassis arranged on the motor, a plurality of first blades with one end arranged at the edge of the chassis and distributed in a circumferential array, and a fixing ring arranged at the other ends of the plurality of first blades. The chassis includes a connecting disc arranged on the motor, a connecting ring connected to the plurality of first blades, and a plurality of connecting arms arranged between the connecting disc and the connecting ring and inclined. A negative ion generator is arranged near the air inlet end of the fan on the central axis of the motor; on the plurality of connecting arms of the chassis, there is an inner cylinder with a gradually decreasing outer diameter towards the air inlet direction of the fan. A plurality of second blades in the same direction as the first blades are arranged on the circumferential side of the inner cylinder. A plurality of strip-shaped air inlet holes adjacent to the second blades are arranged on the circumferential side of the inner cylinder. A bottom cover forming a storage cavity with the chassis is arranged between the rear side of the connecting ring of the chassis and the motor. An oil discharge hole is arranged at the bottom of the bottom cover.

[0006] By adopting the above technical solution, the negative ion generator decomposes and converts harmful substances in the oil fume into harmless water and carbon dioxide, and at the same time generates negative ions to effectively purify the air. At the same time, when the oil fume flows into the fan, since the inner cylinder and the second blades also rotate, it has a reverse adsorption effect on the oil fume discharged during the rotation of the first blade, making it easy for the denser oil molecules and water molecules (including the water decomposed by the negative ion generator) in the oil fume to be adsorbed to the middle of the wind wheel, and enter and be discharged from the storage cavity through the strip-shaped air inlet holes of the inner cylinder, thereby reducing the content of oil molecules in the discharged oil fume, and finally realizing the separation of the denser oil molecules and water molecules in the oil fume.

[0007] A further setting of the present utility model is that: the connecting line between the second blade and the inner cylinder is inclined, and the connecting line between the second blade and the inner cylinder and the center line of the central axis of the motor are not in the same plane.

[0008] By adopting the above technical solution, the connecting line between the second blade and the inner cylinder is inclined, and the connecting line between the second blade and the inner cylinder and the center line of the central axis of the motor are not in the same plane. At this time, during the operation of the inner cylinder and the plurality of second blades, it can improve the reverse adsorption effect on the oil fume discharged during the rotation of the first blade, making it easy for the denser oil molecules and water molecules in the oil fume to be adsorbed to the middle of the wind wheel.

[0009] A further setting of the present utility model is that: the connection part between the second blade and the inner cylinder is on one side of the strip-shaped air inlet hole.

[0010] By adopting the above technical solution, the connection part between the second blade and the inner cylinder is on one side of the strip-shaped air inlet hole, thus facilitating the denser oil molecules and water molecules in the oil fume to pass through the strip-shaped air inlet hole.

[0011] A further setting of the present utility model is that: the distance between the inner cylinder and the connecting arm gradually increases along the air inlet direction close to the fan.

[0012] By adopting the above technical solution, the distance between the inner cylinder and the connecting arm gradually increases along the air inlet direction close to the fan, facilitating the denser oil molecules and water molecules in the oil fume to enter the storage cavity. Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the present utility model;

[0014] Figure 2 is a structural schematic diagram of the present utility model after removing the volute;

[0015] Figure 3 is a structural schematic diagram of the impeller and the inner cylinder in the present utility model;

[0016] Figure 4It is another structural schematic diagram of the impeller and the inner cylinder in the present utility model.

[0017] Reference numerals: 1, volute; 2, motor; 3, impeller; 31, chassis; 311, connection disk; 312, connection ring; 313, connection arm; 32, first blade; 33, fixing ring; 34, negative ion generator; 35, inner cylinder; 351, strip-shaped air inlet hole; 36, second blade; 37, bottom cover; 371, oil drain hole. Specific embodiments

[0018] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] Embodiment: A centrifugal fan for a range hood, as Figure 1 shown, includes a volute 1, a motor 2 provided on the volute 1, and an impeller 3 provided on the output shaft of the motor 2.

[0020] As shown in FIGS. 1 to Figure 4 shown, the motor 2 is an outer rotor motor; the impeller 3 includes a chassis 31 provided on the motor 2, a plurality of first blades 32 with one end provided at the edge of the chassis 31 and distributed in a circumferential array, and a fixing ring 33 provided at the other ends of the plurality of first blades 32. The chassis 31 includes a connection disk 311 provided on the motor 2, a connection ring 312 connected to the plurality of first blades 32, and a plurality of connection arms 313 provided between the connection disk 311 and the connection ring 312 and inclined. A negative ion generator 34 is provided on the central axis of the motor 2 near the air inlet end of the fan; a plurality of connection arms 313 of the chassis 31 are provided with an inner cylinder 35 whose outer diameter gradually decreases towards the air inlet direction of the fan. The circumferential side of the inner cylinder 35 is provided with a plurality of second blades 36 in the same direction as the first blades 32. The circumferential side of the inner cylinder 35 is provided with a plurality of strip-shaped air inlet holes 351 adjacent to the second blades 36. A bottom cover 37 forming a storage cavity with the chassis 31 is provided between the rear side of the connection ring 312 of the chassis 31 and the motor 2. An oil drain hole 371 is provided at the bottom of the bottom cover 37.

[0021] As Figures 1 to 4 shown, the connection line between the second blade 36 and the inner cylinder 35 is inclined, and the connection line between the second blade 36 and the inner cylinder 35 and the center line of the central axis of the motor 2 are not in the same plane. The connection part between the second blade 36 and the inner cylinder 35 is on one side of the strip-shaped air inlet hole 351. The distance between the inner cylinder 35 and the connection arm 313 gradually increases along the air inlet direction of the fan.

[0022] Implementation effect: The negative ion generator 34 decomposes and converts harmful substances in the oil fume into harmless water and carbon dioxide, and at the same time generates negative ions to effectively purify the air. At the same time, when the oil fume flows into the fan, since the inner cylinder 35 and the second blades 36 also rotate accordingly, there is a reverse adsorption effect on the oil fume discharged during the rotation of the first blade 32, which enables the denser oil molecules and water molecules (including the water decomposed by the negative ion generator 34) in the oil fume to be easily adsorbed to the middle of the wind wheel, and enter and be discharged into the storage cavity through the strip-shaped air inlet holes 351 of the inner cylinder 35, thereby reducing the content of oil molecules in the discharged oil fume, and finally realizing the separation of the denser oil molecules and water molecules in the oil fume.

[0023] The connecting line between the second blade 36 and the inner cylinder 35 is inclined, and the connecting line between the second blade 36 and the inner cylinder 35 is not in the same plane as the center line of the central axis of the motor 2. At this time, during the operation of the inner cylinder 35 and the plurality of second blades 36, the reverse adsorption effect on the oil fume discharged during the rotation of the first blade 32 can be improved, and the denser oil molecules and water molecules in the oil fume can be easily adsorbed to the middle of the wind wheel. The connection between the second blade 36 and the inner cylinder 35 is on one side of the strip-shaped air inlet hole 351, which facilitates the denser oil molecules and water molecules in the oil fume to pass through the strip-shaped air inlet hole 351. The distance between the inner cylinder 35 and the connecting arm 313 gradually increases along the air inlet direction close to the fan, which facilitates the denser oil molecules and water molecules in the oil fume to enter the storage cavity.

[0024] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A centrifugal fan for a range hood, comprising a volute (1), a motor (2) arranged on the volute (1), and an impeller (3) arranged on the output shaft of the motor (2), characterized in that: The motor (2) is an outer-rotor motor; the impeller (3) includes a chassis (31) arranged on the motor (2), a plurality of first blades (32) with one end arranged at the edge of the chassis (31) and distributed in a circumferential array, and a fixing ring (33) arranged at the other ends of the plurality of first blades (32). The chassis (31) includes a connection disk (311) arranged on the motor (2), a connection ring (312) connected to the plurality of first blades (32), and a plurality of connecting arms (313) arranged between the connection disk (311) and the connection ring (312) and inclined. A negative ion generator (34) is arranged on the central axis of the motor (2) near the air inlet end of the blower; a plurality of connecting arms (313) of the chassis (31) are provided with an inner cylinder (35) with an outer diameter gradually decreasing towards the air inlet direction close to the blower. A plurality of second blades (36) in the same direction as the first blades (32) are arranged on the circumferential side of the inner cylinder (35). A plurality of strip-shaped air inlet holes (351) adjacent to the second blades (36) are arranged on the circumferential side of the inner cylinder (35). A bottom cover (37) forming a storage cavity with the chassis (31) is arranged between the rear side of the connection ring (312) of the chassis (31) and the motor (2). An oil drain hole (371) is arranged at the bottom of the bottom cover (37).

2. The centrifugal fan for a range hood according to claim 1, wherein: The connecting line between the second blade (36) and the inner cylinder (35) is inclined, and the connecting line between the second blade (36) and the inner cylinder (35) is not in the same plane as the center line of the central axis of the motor (2).

3. The centrifugal fan for a range hood according to claim 1, characterized in that: The connection part between the second blade (36) and the inner cylinder (35) is on one side of the strip-shaped air inlet hole (351).

4. The centrifugal fan for a range hood according to claim 1, characterized in that: The distance between the inner cylinder (35) and the connecting arm (313) gradually increases along the air inlet direction close to the blower.

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