Range hood volute and range hood

Abstract

The utility model belongs to the technical field of centrifugal fans, and particularly relates to a range hood volute and a range hood. According to the range hood volute, the volute tongue in the volute body is arranged to be of the short tongue structure, the working efficiency curve of a draught fan applying the range hood volute can be flat, the range hood volute has the advantages of being wide in economical working area and low in noise, circulating flow of part of gas in the range hood volute is effectively reduced, the interior of the range hood volute is smooth and even, and the service life of the range hood volute is prolonged. Large backflow and impact are avoided, so that aerodynamic noise is reduced; the air inlet flow collector is an arc-shaped flow collector, so that the flow state of effectively guiding airflow into the impeller is good, the flow loss is small, the formed vortex area is small, the circular flow of the air in the vortex is further reduced, and the aerodynamic noise is reduced; and the air outlet diffuser is an asymmetric conical diffuser. The gas flowing out of the range hood volute at a high speed is further converted into pressure energy from kinetic energy under the action of the diffuser, so that not only can the working efficiency be improved, but also the noise reduction effect can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of range hood centrifugal fans, and in particular relates to a range hood volute and a range hood. Background Art

[0002] When the impeller of a range hood centrifugal fan rotates, the gas between the blades is subjected to centrifugal force and gains kinetic energy, which is discharged from the periphery of the impeller. Guided by the volute-shaped casing, it flows toward the air outlet of the volute, thereby forming a negative pressure in the center of the impeller, allowing external air to continuously flow in to replenish it, thus enabling the centrifugal fan to discharge the gas. The electric motor transmits power to the impeller through the drive shaft. The rotation of the impeller transfers energy to the air. Under the action of rotation, the air generates centrifugal force, and the air diffuses to the surrounding along the blades of the fan impeller. However, when the fan is started for ventilation, it is also accompanied by strong noise. In the volute of an existing centrifugal fan, when the impeller rotates, the air circulates more times in the inner cavity of the volute, resulting in a large backflow of the air flow in the volute and more impact, thus generating more aerodynamic noise. Utility Model Content

[0003] The purpose of the utility model is to overcome the problem that when the impeller of the volute of the existing range hood centrifugal fan rotates, the air flow circulates more times in the inner cavity of the range hood volute, causing the air flow in the range hood volute to cause greater backflow and be subjected to more impact, thereby generating more aerodynamic noise, and to provide a range hood volute and range hood with good noise reduction effect.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The range hood volute includes a volute body, which is provided with an air inlet collector located in the middle of the front side and an air outlet diffuser located at the outer end of the spiral line of the volute body. The inner wall of the volute body is adjacent to the connection with the air outlet diffuser and is provided with a volute tongue arranged in the axial direction. The length of the volute tongue is adapted to the width of the volute body. The volute tongue is a short tongue structure, the air inlet collector is an arc-shaped collector, and the air outlet diffuser is an asymmetric conical diffuser.

[0006] Compared with the prior art, the range hood volute of the present invention, by configuring the volute tongue in the volute body to have a short tongue structure, can make the working efficiency curve of the fan using the range hood volute flat, with the advantages of a wide economical working range and low noise. It also effectively reduces the circulation of some gases in the range hood volute, making the interior of the range hood volute smooth and uniform, avoiding large backflow and impact, and thus reducing aerodynamic noise. The air inlet collector adopts an arc-shaped collector, which effectively guides the airflow into the impeller, and the flow state is also better, with less flow loss and a smaller vortex area formed, thereby further reducing the circulation of gas in the volute and reducing aerodynamic noise. The air outlet diffuser adopts an asymmetric conical diffuser, and the gas flowing out of the range hood volute at a high speed is further converted from kinetic energy to pressure energy through the diffuser, which not only improves working efficiency but also achieves the effect of noise reduction.

[0007] Furthermore, an impeller is rotatably connected to the volute casing, the outlet diameter D2 of the impeller is 190 mm to 280 mm, and the gap between the outer end of the volute tongue and the outer circumference of the impeller is t=(0.05 to 0.06)*D2.

[0008] Furthermore, the range hood volute width B is 150 mm to 250 mm.

[0009] Furthermore, the end cross-sectional opening A of the spiral line of the volute casing is 75 mm to 95 mm.

[0010] Furthermore, the air outlet width of the air outlet diffuser is C=1.4*A=105mm to 133mm.

[0011] Furthermore, the tongue angle θ of the volute casing is 35° to 60°.

[0012] Furthermore, a gap t between the outer end of the volute tongue and the outer circumference of the impeller is 13 mm to 16 mm.

[0013] Furthermore, the outlet size of the volute of the range hood is C*D=[100,160]mm*[170,230]mm; the outlet length L of the volute body is 160mm to 190mm; the diffusion angle of the air inlet collector is 7° to 15°; and the maximum outer diameter of the range hood volute is 300mm to 450mm.

[0014] Furthermore, the diffusion angle of the air outlet diffuser is 7° to 15°, and the height of the diffuser is 100mm to 190mm.

[0015] Furthermore, the volute casing includes a casing body and baffles located on both sides of the casing body, the air inlet collector is arranged on one of the baffles, and the volute tongue is formed by a bending process along with the casing body; through such an arrangement, the processing method of the volute casing is simple and the product production efficiency is high.

[0016] Furthermore, the volute casing includes a shell body and baffles located on both sides of the shell body. The body is processed by a bending process, and the volute tongue is a solid structure. The volute tongue is connected to the inner side of the shell body. Through this arrangement, the processing method of the volute casing is simple and the product production efficiency is high.

[0017] A range hood comprises a range hood body and a smoke exhaust structure arranged on the top of the range hood body, the smoke exhaust structure comprising a smoke exhaust channel connected to the smoke chamber of the range hood body and a centrifugal fan, the centrifugal fan being arranged in the smoke exhaust channel, the centrifugal fan comprising the range hood volute, an impeller arranged in the range hood volute, and a motor, the motor being in transmission connection with the impeller. By such an arrangement, by setting the volute tongue in the volute body to a short tongue structure, the working efficiency curve of the fan using the range hood volute can be made flat, with the advantages of a wide economic working area and low noise, and also effectively reducing the circulation of part of the gas in the range hood volute, making the interior of the range hood volute smooth and uniform, avoiding large backflow and impact, thereby reducing aerodynamic noise; the air inlet collector adopts an arc-shaped collector, which effectively guides the airflow into the impeller, the flow state is also better, the flow loss is small, and the vortex area formed is also small, thereby further reducing the circulation of gas in the volute and reducing aerodynamic noise; and the air outlet diffuser adopts an asymmetric conical diffuser, and. The gas flowing out of the volute of the range hood at a high speed is further converted from kinetic energy to pressure energy through the diffuser, which not only improves work efficiency but also achieves the effect of noise reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the range hood volute

[0019] Figure 2 Schematic diagram of removing one side baffle of the range hood volute Figure 1

[0020] Figure 3 Schematic diagram of removing one side baffle of the range hood volute Figure 2

[0021] Figure 4 Schematic diagram of the structure of the range hood volute

[0022] Figure 5 Schematic diagram of a range hood

[0023] Figure 6 Front view of the range hood volute

[0024] Figure 7 Side view of the range hood volute

[0025] Figure 8 A top view of the hood volute DETAILED DESCRIPTION

[0026] The following describes specific embodiments of the present invention in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0027] Example 1:

[0028] See also Figures 1 to 8 The volute of the range hood of the present invention includes a volute body 1, which is provided with an air inlet collector 2 located in the middle of the front side and an air outlet diffuser 18 located at the outer end of the spiral line of the volute body 1. A volute tongue 4 arranged in the axial direction is provided at the connection between the inner wall of the volute body 1 and the air outlet diffuser 18. The length of the volute tongue 4 is adapted to the width of the volute body 1. The volute tongue 4 is a short tongue structure, the air inlet collector 2 is an arc-shaped collector, and the air outlet diffuser 18 is an asymmetric conical diffuser.

[0029] The short tongue structure is relative to other types of snail tongues (such as pointed tongue structure, deep tongue structure, flat tongue structure), and its protruding part is shorter, usually presenting a relatively flat or slightly shorter tongue-like shape.

[0030] Compared with the prior art, the range hood volute of the present invention, by configuring the volute tongue 4 within the volute body 1 as a short-tongue structure, can achieve a flatter operating efficiency curve for the fan using the range hood volute, with the advantages of a wide economical operating range and low noise. It also effectively reduces the circulation of some gas within the range hood volute, making the interior of the range hood volute smooth and uniform, avoiding large backflows and impacts, and thus reducing aerodynamic noise. The air inlet collector 2 adopts an arc-shaped collector, effectively guiding the airflow into the impeller 34, achieving a better flow state, less flow loss, and a smaller vortex area, thereby further reducing the circulation of gas within the volute and reducing aerodynamic noise. The air outlet diffuser 18 adopts an asymmetric conical diffuser, and the high-velocity gas flowing out of the range hood volute is further converted from kinetic energy to pressure energy by the diffuser, thereby not only improving operating efficiency but also achieving a noise reduction effect.

[0031] See also Figures 1 to 8In one embodiment, the volute casing 1 is provided with an impeller 34 rotatably connected thereto, and the outlet diameter D2 of the impeller 34 is 190 mm to 280 mm. The outlet diameter D2 of the impeller 34 refers to the outer diameter of the impeller 34. The outlet diameter D2 of the impeller 34 can be 190 mm, 200 mm, 240 mm, 250 mm, 255 mm, 260 mm, 270 mm, or 280 mm. The gap between the outer end of the volute tongue 4 and the outer circumference of the impeller 34 is t = (0.05 to 0.06) * D2.

[0032] In one embodiment, the width B of the range hood volute is 150 mm to 250 mm, and can be 150 mm, 186 mm or 250 mm.

[0033] In one embodiment, the opening degree A of the end section of the spiral line of the volute casing 1 is 75 mm to 95 mm, and can be 75 mm, 80 mm, 85 mm, 90 mm or 95 mm.

[0034] In one embodiment, the air outlet width C of the air outlet diffuser 18 is 1.4*A=105 mm to 133 mm, and the air outlet width C can be 110 mm, 116 mm or 130 mm.

[0035] In one embodiment, the tongue angle θ of the volute casing 1 is 35° to 60°, and the tongue angle can be 35°, 50° or 60°.

[0036] See also Figures 1 to 8 In one embodiment, the gap t between the outer end of the volute tongue 4 and the outer circumference of the impeller 34 is 13 mm to 16 mm. Preferably, the gap t is 13 mm, 14 mm, 14.8 mm, 15 mm or 16 mm.

[0037] See also Figures 1 to 8 In one embodiment, the outlet size of the volute of the range hood is C*D=[100,160]mm*[170,230]mm, and the outlet size of the volute of the range hood can be 100*176mm, 116*186mm or 128*200mm; the outlet length L of the volute body is 160mm to 190mm, and can be 160mm, 170mm, 176mm, 180mm or 190mm; the diffusion angle of the air inlet collector 2 is 7° to 15°, and can be 7°, 10°, 12° or 15°; the maximum outer diameter of the range hood volute is 300mm to 450mm, and can be 350mm or 392mm.

[0038] In one embodiment, the diffusion angle of the air outlet diffuser 18 is 7° to 15°, and can be 7°, 10°, 12° or 15°. The height of the diffuser is 100mm to 190mm, and can be 160mm, 170mm, 176mm, 180mm or 190mm.

[0039] In one embodiment, the maximum cross-sectional size of the range hood volute is [70,95] mm*[160,200] mm, which can be 85 mm*186 mm, 70 mm*190 mm or 90 mm*200 mm. The base circle size of the range hood volute is 200 to 300 mm, which can be 250 mm, 260 mm, 270 mm or 280 mm. The transition section length of the range hood volute is 150 mm, and the volute body outlet length L is 1 The maximum outer diameter of the hood volute is 300 to 400 mm, and can be 320 mm, 350 mm, 370 mm, 392 mm, or 400 mm. The outlet inner diameter of the air diffuser 18 is 160 to 190 mm, and can be 160 mm, 170 mm, 176 mm, 180 mm, or 190 mm. The maximum angle of the transition section of the hood volute is 7° to 15°, and can be 7°, 10°, 12°, or 15°.

[0040] See also Figure 1 and Figure 2 In one embodiment, the volute casing 1 includes a casing body 11 and baffles 12 located on both sides of the casing body 11, the air inlet collector 2 is arranged on one of the baffles 12, and the volute tongue 4 is formed by a bending process along with the casing body 11; through such an arrangement, the processing method of the volute casing 1 is simple and the product production efficiency is high.

[0041] See also Figure 1 and Figure 4 In one embodiment, the volute casing 1 includes a shell body 11 and baffles 12 located on both sides of the shell body 11. The body is formed by a bending process. The volute tongue 4 is a solid structure. The volute tongue 4 is connected to the inner side of the shell body 11. The volute tongue 4 is connected to the inner side of the shell body 11 by screw connection or adhesive connection, for example. Through such an arrangement, the volute casing 1 is simple to process and the product production efficiency is high.

[0042] Example 2:

[0043] See also Figures 1 to 8The main purpose of this embodiment is to provide a range hood using the range hood volute 33 of the first embodiment, including a range hood body 2 and a smoke exhaust structure 3 arranged on the top of the range hood body 2, the smoke exhaust structure 3 including a smoke exhaust channel 31 connected to the oil smoke chamber of the range hood body 2 and a centrifugal fan 32, the centrifugal fan 32 is arranged in the smoke exhaust channel 31, the centrifugal fan 32 includes the range hood volute 33, an impeller 34 arranged in the range hood volute 33 and a motor 35, the motor 35 is connected to the impeller 34 in a transmission manner.

[0044] Compared with the prior art, the range hood of the present invention, by configuring the volute tongue 4 in the volute housing 1 as a short-tongue structure, can achieve a flatter operating efficiency curve for the fan using the range hood volute, with the advantages of a wide economical operating range and low noise. It also effectively reduces the circulation of some gas within the range hood volute, making the interior of the range hood volute smooth and uniform, avoiding large backflows and impacts, and thus reducing aerodynamic noise. The air inlet collector 2 adopts an arc-shaped collector, which effectively guides the airflow into the impeller, improves the flow state, reduces flow losses, and forms a smaller vortex area, thereby further reducing the circulation of gas within the volute and reducing aerodynamic noise. The air outlet diffuser 18 adopts an asymmetric conical diffuser, and the high-velocity gas flowing out of the range hood volute is further converted from kinetic energy to pressure energy by the diffuser, thereby not only improving operating efficiency but also achieving the effect of noise reduction.

[0045] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience of description only and do not constitute any limitation to the present invention.

Claims

1. The volute of the range hood is characterized by: The volute comprises a volute housing, wherein the volute housing is provided with an air inlet collector located in the middle of the front side and an air outlet diffuser located at the outer end of the spiral line of the volute housing, and a volute tongue arranged in the axial direction is provided on the inner wall of the volute housing adjacent to the connection with the air outlet diffuser. The length of the volute tongue is adapted to the width of the volute housing, and the volute tongue is a short tongue structure. The air inlet collector is an arc-shaped collector, and the air outlet diffuser is an asymmetric conical diffuser. The volute casing includes a shell body and baffles located on both sides of the shell body. The shell body is processed by a bending process. The volute tongue is a solid structure and is connected to the inner side of the shell body.

2. The range hood volute according to claim 1, characterized in that: An impeller is rotatably connected to the volute casing, and the outlet diameter D2 of the impeller is 190 mm to 280 mm. The gap between the outer end of the volute tongue and the outer circumference of the impeller is t=(0.05 to 0.06)*D2.

3. The range hood volute according to claim 1, characterized in that: The volute width B is 150mm to 250mm; The end cross-sectional opening A of the spiral line of the volute casing is 75mm to 95mm; The volute tongue is connected to the inner side of the shell body by screw connection or adhesive connection.

4. The range hood volute according to claim 3, characterized in that: The air outlet width of the air outlet diffuser is C=1.4*A=105mm to 133mm; The tongue angle θ of the volute casing is 35° to 60°.

5. The range hood volute according to claim 2, characterized in that: The gap t between the outer end of the volute tongue and the outer circumference of the impeller is 13 mm to 16 mm.

6. The range hood volute according to claim 1, characterized in that: The outlet size of the volute of the range hood is C*D=[100,160]mm*[170,230]mm; the outlet length L of the volute body is 160mm to 190mm; the diffusion angle of the air inlet collector is 7° to 15°; the maximum outer diameter of the volute is 300mm to 450mm.

7. The range hood volute according to claim 1, characterized in that: The diffusion angle of the air outlet diffuser is 7° to 15°, and the height of the diffuser is 100mm to 190mm.

8. The range hood volute according to any one of claims 1 to 7, characterized in that: The volute casing includes a casing body and baffles located on both sides of the casing body. The air inlet collector is arranged on one of the baffles. The volute tongue is formed by bending along with the casing body.

9. The range hood volute according to any one of claims 1 to 7, characterized in that: The volute casing includes a shell body and baffles located on both sides of the shell body. The shell body is processed by a bending process. The volute tongue is a solid structure and is connected to the inner side of the shell body.

10. A range hood comprising a range hood body and a smoke exhaust structure disposed on the top of the range hood body, the smoke exhaust structure comprising a smoke exhaust channel communicating with the smoke chamber of the range hood body and a centrifugal fan, the centrifugal fan being disposed in the smoke exhaust channel, characterized in that: The centrifugal fan comprises the range hood volute according to any one of claims 1 to 9, an impeller arranged in the range hood volute, and a motor, wherein the motor is drivingly connected to the impeller.

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