Fan of range hood and range hood

Abstract

The present invention discloses a fan of a range hood, comprising a fan volute and an impeller assembly arranged in the fan volute, the impeller assembly comprising a forward impeller composed of a plurality of forward rotating impeller blades and a reverse impeller composed of a plurality of reverse rotating impeller blades, the forward impeller and the reverse impeller being spaced coaxially arranged and rotating in opposite directions; at the same time, the present invention also provides a range hood that should use the above-mentioned fan, and also comprises a smoke collecting hood, the smoke collecting hood being provided with three air inlets of different widths. The present invention increases the static pressure inside the fan layer by layer within the shortest distance by rotating the forward impeller and the reverse impeller simultaneously, and the supercharging effect is better than that of unidirectional rotation supercharging, and at the same time, the fan volute is designed to be gradually closed in the direction from the air inlet to the air outlet, so that the static pressure inside the range hood is gradually increased, and a continuous high-intensity suction force is generated on the oil smoke.

Description

Technical Field

[0001] The invention belongs to the technical field of range hoods, and in particular relates to a fan of a range hood and the range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Air volume, air pressure and noise are the core indicators of range hoods. When using range hoods, 85% of users feel that the range hoods have low suction power and cannot suck cleanly. Users generally believe that strong suction power and good oil fume extraction effect are their biggest requirements when purchasing range hoods. In recent years, the entire industry has collectively entered the era of high suction power. High-suction range hoods have also become the first choice for consumers to buy range hoods. The market share has increased much faster than other types of range hoods, and has truly been widely recognized by consumers.

[0003] As the core component of the range hood, the rationality of the fan structure has a great impact on the performance of the range hood. The range hoods on the market now generally have problems such as low wind pressure, incomplete suction, slow suction and loud noise. The power mechanism of the range hood is a centrifugal fan, which generates negative pressure at the entrance of the range hood through the rotation of the fan to absorb the fumes generated in the kitchen. At present, the working pressure of the range hood is generally around 200Pa (that is, the air volume is 7m 3 / min working state), for residents on the lower floors of high-rise buildings (more than 25 floors), the pressure is still relatively small. And during the peak cooking time, the current state of the range hood is difficult to meet the 7m 3 / min exhaust standard. The characteristics of centrifugal fans determine that their functions are positioned at large displacement, and high static pressure is their shortcoming, and the smoke suction effect is not good. Summary of the invention

[0004] In order to overcome the deficiencies in the above-mentioned prior art, the main purpose of the present invention is to provide a fan of a range hood and a range hood, which can solve the problem that the kitchen range hood has difficulty in exhausting air and poor fume absorption effect.

[0005] In order to achieve the above-mentioned objectives, the present invention first provides a fan of a range hood, including a fan volute and an impeller assembly arranged in the fan volute, the impeller assembly including a forward impeller composed of a plurality of forward-rotating impeller blades and a reverse impeller composed of a plurality of reverse-rotating impeller blades, the forward impeller and the reverse impeller are coaxially arranged at intervals and rotate in opposite directions.

[0006] Furthermore, two or more groups of forward impellers and reverse impellers are provided.

[0007] Furthermore, the forward impellers and the reverse impellers are arranged alternately when arranged in groups.

[0008] Furthermore, the outer diameter of the impeller and the corresponding inner diameter of the fan volute gradually decrease in the direction from the air inlet to the air outlet.

[0009] Furthermore, each forward-rotating impeller blade and reverse-rotating impeller blade are respectively mounted on a hub connected to the motor output shaft and are evenly arranged in a divergent shape around the hub axis. Each blade is set at a certain torsion angle relative to the hub axis in the direction from the air inlet to the air outlet. The bottom torsion angle close to the hub center axis is 110 to 140 degrees, and the far end torsion angle away from the hub axis is 100 to 130 degrees. The bottom torsion angle is greater than the far end torsion angle.

[0010] Further, a diameter ratio of each hub to its corresponding impeller is 0.15 to 0.25.

[0011] Furthermore, the hub includes a first hub and a second hub, and is sleeved on the motor output shaft in an interlaced and spaced manner. The forward impeller is fixed on the first hub, and the reverse impeller is fixed on the second hub.

[0012] Furthermore, the forward impeller is driven by the motor and the first hub is directly connected to the motor output shaft, driving the forward rotating impeller blades to rotate. The reverse impeller is driven by the gear transmission driven by the motor output shaft and the second hub drives the reverse rotating impeller blades to rotate in the opposite direction of the forward rotating impeller blades.

[0013] The present invention further provides a range hood, comprising a fume collecting hood and a fan of the range hood described above, wherein the fan of the range hood is installed above the fume collecting hood.

[0014] Furthermore, the smoke collecting hood is provided with an upper air inlet hole, a middle air inlet hole and a lower air inlet hole, and the upper air inlet hole, the middle air inlet hole and the lower air inlet hole are arranged from small to large according to the opening size.

[0015] Compared with the prior art, the present invention increases the static pressure inside the fan layer by layer within the shortest distance by simultaneously and counter-rotating the forward impeller and the reverse impeller. The pressurization effect is better than that of unidirectional rotation. At the same time, the fan volute is designed to gradually close from the air inlet to the air outlet, so that the static pressure inside the range hood is gradually increased, and a continuous high-intensity suction force is generated on the oil fume. While meeting the exhaust standards, the oil fume suction effect is enhanced, solving the problem of difficult exhaust and poor oil fume suction effect of kitchen range hoods on the ground floor of high-rise buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a fan of a range hood of the present invention;

[0017] Figure 2 This is a structural diagram of an impeller assembly of a fan of a range hood according to the present invention;

[0018] Figure 3This is a diagram of the hub assembly structure of a fan of a range hood according to the present invention;

[0019] Figure 4 A cross-sectional view of a second hub of a fan of a range hood according to the present invention;

[0020] Figure 5 A schematic diagram of the torsion angle of the bottom end of a blade of a fan of a range hood according to the present invention;

[0021] Figure 6 The figure is a schematic diagram of the distal torsion angle of the blades of a fan of a range hood according to the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Embodiment 1:

[0024] Embodiment 1 of the present invention provides a fan of a range hood, such as Figure 1 and 2 As shown, it includes an impeller assembly and a fan volute 3, the impeller assembly includes a forward impeller 1 and a reverse impeller 2, the forward impeller 1 is composed of a plurality of forward rotating impeller blades 11, the reverse impeller 2 is composed of a plurality of reverse rotating impeller blades 21, the forward impeller 1 and the reverse impeller 2 are coaxially arranged at intervals and rotate in opposite directions.

[0025] In this way, when the fan is working, the forward impeller 1 and the reverse impeller 2 rotate at the same time, so that the airflow pressure is recursively pushed inside the fan volute 3, which can quickly increase the static pressure inside the fan layer by layer within the shortest distance, produce continuous and high-intensity suction on the oil smoke, and greatly enhance the oil smoke suction effect.

[0026] At least two or more groups of forward impellers 1 and reverse impellers 2 are provided. When the forward impellers 1 and reverse impellers 2 are provided in groups, they are arranged alternately, which can increase the wind force and make the wind pressure quickly recurs from the air inlet to the air outlet inside the fan.

[0027] The outer diameter of the impeller and the corresponding inner diameter of the fan volute 3 gradually decrease from the air inlet to the air outlet. This closing design can suck in more gas and gradually increase the wind pressure.

[0028] The hub 4 is connected to the motor output shaft 5, and the forward rotating impeller blades 11 and the reverse rotating impeller blades 21 are respectively installed on the hub 4 and are evenly arranged in a divergent shape around the axis of the hub 4. Each impeller blade is set at a certain torsion angle relative to the center of the hub 4 along the direction from the air inlet to the air outlet.

[0029] like Figure 3 The hub 4 shown includes a first hub 41 and a second hub 42 , and are sleeved on the motor output shaft 5 in an interlaced and spaced manner. The forward impeller 1 is fixed on the first hub 41 , and the reverse impeller 2 is fixed on the second hub 42 .

[0030] like Figure 4 As shown, the first wheel hub 41 is directly fixedly connected to the motor output shaft 5. When the motor is working, the motor output shaft 5 rotates forward, drives the first wheel hub 41 to rotate forward and drives the forward rotating impeller blades 11 to rotate, and the forward impeller 1 starts to rotate forward; a plurality of gears 6 are arranged between the motor output shaft 5 and the second wheel hub 42, and the gears 6 can make the second wheel hub 42 rotate in the opposite direction to the motor output shaft 5, and the gears of the motor output shaft 5 are meshed with each gear 6, and each gear 6 is meshed with the second wheel hub 42, so that the forward rotation of the motor output shaft causes the second wheel hub 42 to rotate in the reverse direction, and then drives the reverse rotating impeller blades 21 to rotate in the opposite direction to the forward rotating impeller blades 11, and the reverse impeller 2 rotates in the reverse direction synchronously.

[0031] In this way, the forward impeller 1 and the reverse impeller 2 can simultaneously rotate in opposite directions, so that the wind pressure is quickly pushed inside the fan and the suction force of the air inlet is enhanced.

[0032] like Figure 5 and 6 As shown, the torsion angle of the bottom end of the forward impeller blade 11 close to the axis of the first hub 41 is 110 to 140 degrees, and preferably 124 degrees in this embodiment, and the torsion angle of the far end away from the axis of the first hub 41 is 100 to 130 degrees, and preferably 112.5 degrees in this embodiment, and the torsion angle of the bottom end is greater than the torsion angle of the far end. The diameter ratio of each hub 4 to its corresponding impeller is 0.15 to 0.25, and preferably 0.2 in this embodiment. Similarly, the reverse impeller blade 21 is arranged in the structure and manner of the forward impeller blade 11 described above. Such an arrangement enables the impeller blade to better stir the air and generate greater wind force when rotating.

[0033] With the above structure, when the impeller rotates, the impeller blades drive the air to rotate, and the forward impeller 1 and the reverse impeller 2 are staggered and spaced apart from each other to push the air flow pressure inside the fan, thereby generating a faster upward airflow, causing negative pressure to be generated at the air inlet of the range hood, forming a strong suction force, and finally the oil smoke is sucked into the interior of the range hood along with the air flow, thereby achieving an enhanced oil smoke suction effect.

[0034] Embodiment 2:

[0035] Embodiment 2 of the present invention provides a range hood, comprising a fume hood 7 and a fan of the range hood provided in Embodiment 1. The fume hood 7 is provided with three air inlet holes 71 , and the fan of the range hood is installed above the fume hood 7 .

[0036] The air inlet 71 includes an upper air inlet, a middle air inlet and a lower air inlet. The lower air inlet has the largest width, followed by the middle air inlet, and the upper air inlet has the smallest width. The lower air inlet has the largest width and a larger air intake, which can ensure that the rising oil smoke can be sucked in as soon as the airflow starts to rise, reducing the diffusion of oil smoke; the upper air inlet has a small width and a large negative pressure, which can ensure that the rising and diffused oil smoke can be sucked in. By setting different air intake widths, it is ensured that the range hood does not leak oil smoke, and the oil smoke absorption rate of the range hood is improved. Combined with the large suction force generated by the turbo fan provided in Example 1, high static pressure is provided on the premise of meeting the exhaust standard of the fan, which solves the problem of poor exhaust and oil smoke absorption effect of the kitchen range hood on the ground floor in high-rise buildings.

[0037] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A fan for a range hood, It is characterized in that The invention comprises a fan volute and an impeller assembly arranged in the fan volute, wherein the impeller assembly comprises a forward impeller composed of a plurality of forward rotating impeller blades and a reverse impeller composed of a plurality of reverse rotating impeller blades, wherein the forward impeller and the reverse impeller are arranged coaxially at intervals and have opposite rotation directions; the forward impeller and the reverse impeller are arranged in two or more groups; the forward impeller and the reverse impeller are arranged alternately when they are arranged in groups; the outer diameter of the impeller and the corresponding inner diameter of the fan volute are arranged along the direction of the air inlet The direction of the air outlet gradually decreases; each of the forward rotating impeller blades and the reverse rotating impeller blades are respectively mounted on a hub connected to the motor output shaft, and are evenly arranged in a divergent shape with the hub axis, and each of the impeller blades is set at a certain torsion angle relative to the hub axis along the direction from the air inlet to the air outlet, the bottom torsion angle close to the hub axis is 110 to 140 degrees, and the far end torsion angle away from the hub axis is 100 to 130 degrees, and the bottom torsion angle is greater than the far end torsion angle.

2. A fan for a range hood according to claim 1, It is characterized in that The diameter ratio of each hub to its corresponding impeller is 0.15 to 0.

25.

3. The fan of a range hood according to claim 1, It is characterized in that The hub comprises a first hub and a second hub, and is sleeved on the motor output shaft in a staggered and spaced manner. The forward impeller is fixed on the first hub, and the reverse impeller is fixed on the second hub.

4. The fan of a range hood according to claim 3, It is characterized in that The forward impeller is driven by a motor to drive a first hub directly connected to the motor output shaft and drives the forward rotating impeller blades to rotate. The reverse impeller is driven by a gear transmission driven by the motor output shaft and drives a second hub to drive the reverse rotating impeller blades to rotate in a direction opposite to that of the forward rotating impeller blades.

5. A range hood, comprising a fume collecting hood and a fan of the range hood according to any one of claims 1 to 4, It is characterized in that The fan of the range hood is installed above the smoke collecting hood.

6. A range hood according to claim 5, It is characterized in that The smoke collecting hood is provided with an upper air inlet hole, a middle air inlet hole and a lower air inlet hole, and the upper air inlet hole, the middle air inlet hole and the lower air inlet hole are arranged from small to large according to the opening size.

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