Cutting type volute and range hood thereof

Abstract

The utility model relates to the field of range hoods, in particular to a cutting type volute and a range hood comprising the same, the cutting type volute comprises a coaming and a side plate, and the side plate is provided with a through groove for mounting a fan component; the surrounding plate is arranged between the side plates and is of an arc-shaped structure, the surrounding plate and the side plates jointly form an air outlet of the volute, a cutting part is formed on the surrounding plate far away from the air outlet, the cutting part is of a straight structure, and the arrangement direction of the cutting part is consistent with the direction of the air outlet. After the scheme is adopted, the air volume of a product is increased, the operation noise is reduced, and the kitchen environment is improved.

Description

Technical Field

[0001] The utility model relates to the field of range hoods, in particular to a cutting type volute and a range hood thereof. Background Art

[0002] The volute of the multi-blade centrifugal fan in the range hood is one of the core components of the range hood. The air volume, air pressure and noise of the range hood are all affected by this component. The internal airflow of the traditional volute is prone to produce vortices and noise. The existence of vortices increases the flow loss inside the bellows, which in turn manifests as small air volume and high noise in the range hood, affecting the overall performance of the range hood and the living environment of the user.

[0003] Therefore, the inventor conducted further research on this and developed a cutting type volute and a range hood thereof, which resulted in the present case. Utility Model Content

[0004] The utility model aims to provide a cutting type volute and a range hood thereof, which can increase the air volume of the product, reduce the operating noise, and thus improve the kitchen environment.

[0005] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A cutting type volute, comprising

[0007] The enclosure and side panels are provided with through grooves for installing the fan assembly; the enclosure is arranged between the side panels in an arc-shaped structure, and the enclosure and the side panels together form the air outlet of the volute, and a cutting portion is formed on the enclosure away from the air outlet, and the cutting portion is a straight structure, and the setting direction of the cutting portion is consistent with the direction of the air outlet.

[0008] Among the above features, the volute is composed of a shroud and a side plate, which is a conventional technical means in the art, and the fan assembly generally includes a motor, a bracket for mounting the motor, and an impeller driven by the motor;

[0009] By improving the volute enclosure, the space between the side wall of the enclosure and the impeller is compressed, so that the airflow across the impeller re-enters the impeller to form a higher air pressure and present a high flow rate state.

[0010] Furthermore, taking the middle of the cutting portion as point C, the center of the impeller as point O, and the turning point of the volute tongue as point D, the angle θ between OC and OD ranges from 110° to 130°.

[0011] The volute tongue mentioned here refers to the curvature where the enclosure changes direction at the air outlet (that is, it no longer extends along the original curvature), and every volute has this feature.

[0012] Furthermore, the cutting depth of the cutting portion is d1, the distance between the impeller outer diameter and the volute tongue is d2, and the radius of the impeller outer ring is R. Then, when θ is 120°, d1 / R is equal to 0.04, and d2 / R is equal to 0.02.

[0013] The cutting depth of the cutting part is the distance from the arc vertex of the volute to the middle point C of the cutting part when the cutting part is set, and d2 is the shortest distance between the outer diameter of the impeller and the volute tongue;

[0014] Taking into account the outflow effect and the limited space size limitation in the range hood, the volute is modified based on fluid mechanics. When the value meets the above conditions, the pressure enhancement is optimal.

[0015] Furthermore, the through groove is a circular structure, which is used to set a motor bracket, and the motor bracket is used to install a motor, and the motor drives the cylindrical impeller to rotate.

[0016] A range hood comprises a bellows and a smoke collecting chamber. A cutting-type volute is arranged in the bellows, an air outlet of the cutting-type volute faces upward, and the smoke collecting chamber is arranged below the bellows.

[0017] After adopting the above scheme, the utility model has the following advantages compared with the prior art:

[0018] The utility model uses volute-shaped wire cutting to increase pressure, and the working capacity of the impeller is enhanced compared with that before the modification; the cutting surface adopts an arc design, which can reduce the resistance of oil smoke entering the volute cutting area, avoid the formation of unreasonable flow channels, and effectively suppress the generation of noise vortex. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a range hood that uses a cut-type volute;

[0020] Figure 2 It is a cutting type volute with a motor installed;

[0021] Figure 3 is a schematic diagram of a cut-type volute;

[0022] Figure 4 It is a schematic diagram of the impeller in the cut-type volute;

[0023] Figure 5 It is a schematic diagram of airflow;

[0024] Description of symbols

[0025] Volute 1, enclosure 11, side panel 12, air outlet 13,

[0026] Bracket 2, impeller 3, bellows 4, smoke collecting chamber 5, DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, a range hood comprises a bellows 4 and a smoke collecting chamber 5. A cutting-type volute 1 is arranged in the bellows 4. The air outlet 13 of the cutting-type volute 1 faces upward. The smoke collecting chamber 5 is arranged below the bellows 4. Negative pressure is generated at the bellows to discharge the oil smoke at the smoke outlet of the smoke collecting chamber from above.

[0029] The negative pressure in the bellows is generated by the volute 1 assembly, which includes a cutting volute 1, a motor, and an impeller 3. Figure 2 As shown, the cutting type volute 1 includes a panel 11 and a side panel 12. Taking the angle in the figure as an example, the side panel 12 is arranged on the front and rear sides of the volute 1, and the panel 11 is arranged between the side panels 12 to form an arc-shaped structure. The panel 11 and the side panels 12 together form an upward air outlet 13. Figure 3 The side plate 12 is provided with an arc-shaped through slot, in which a bracket is provided, and a motor is provided on the bracket, and the motor is used to drive the cylindrical impeller 3 to rotate. The relative position of the impeller 3 in the volute 1 is referenced as follows: Figure 4 , 5 shown.

[0030] like Figure 3 , 4 As shown in the angle, the upper part of the enclosure 11 forms a cutting section AB, which is a straight structure, the air outlet 13 faces left, the turning point of the volute tongue is point D (the volute tongue is the arc where the outer arc edge of the enclosure 11 changes direction), the middle of the cutting section AB is point C, the center of the impeller 3 is point O, the cutting depth of the cutting section is d1, the distance between the outer diameter of the impeller 3 and the volute tongue is d2, the radius of the outer ring of the impeller 3 is R, then the angle θ between OC and OD is 120°, d1 / R is equal to 0.04, and d2 / R is equal to 0.02; refer to Figure 5 A small part of the airflow at the volute tongue goes back through the blade channel and returns to the upstream of impeller 3 (area A), and then the fluid flows back to the impeller to form a cross-impeller airflow. The asymmetric flow is significantly enhanced and flows back into the impeller from area B. The blade channel in area B presents a high flow velocity state accordingly. Therefore, more cross-impeller airflow re-enters the impeller, thereby forming a higher air pressure.

[0031] The above are only specific embodiments of the present utility model. At the same time, all words such as "upper, lower, left, right, middle" involved in the present utility model are for reference only and are not absolutely limiting. Any non-substantial changes made using the present utility model shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A cutting type volute, characterized in that: include The enclosure and side panels are provided with through grooves for installing the fan assembly; the enclosure is arranged between the side panels in an arc-shaped structure, and the enclosure and the side panels together form the air outlet of the volute, and a cutting portion is formed on the enclosure away from the air outlet, and the cutting portion is a straight structure, and the setting direction of the cutting portion is consistent with the direction of the air outlet.

2. A cutting type volute according to claim 1, characterized in that: With the middle of the cutting portion as point C, the center of the impeller as point O, and the turning point of the volute tongue as point D, the angle θ between OC and OD ranges from 110° to 130°.

3. A cutting type volute according to claim 2, characterized in that: The cutting depth of the cutting portion is d1, the distance between the impeller outer diameter and the volute tongue is d2, and the radius of the impeller outer ring is R. When θ is 120°, d1 / R is equal to 0.04, and d2 / R is equal to 0.

02.

4. A cutting type volute according to claim 1, characterized in that: The through groove is a circular structure, which is used to set a motor bracket, and the motor bracket is used to install a motor, and the motor drives the cylindrical impeller to rotate.

5. A range hood, characterized in that: The utility model comprises a bellows and a smoke collecting chamber. A cutting-type volute is arranged in the bellows, an air outlet of the cutting-type volute faces upward, and the smoke collecting chamber is arranged below the bellows.

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