CN206530542U - A twin-turbine centrifugal fan volute for a range hood - Google Patents

Abstract

The utility model relates to the technical field of twin-turbine centrifugal fans, in particular to a twin-turbine centrifugal fan volute for a range hood, which comprises a volute panel, a volute bottom plate, a left coaming and a right coaming; air inlet holes are correspondingly formed in the left side and the right side of the volute panel; motor fixing holes are correspondingly formed in the left side and the right side of the volute bottom plate; the projection of the circle centers of the air inlet holes on the left side and the right side of the volute panel on the plane where the volute bottom plate is located is superposed with the circle centers of the motor fixing holes on the left side and the right side of the volute bottom plate; the edge profile of the right coaming is formed by connecting a straight line AB, a spiral curve BC, an arc line CD and a straight line DE which are smoothly transited in sequence; the constant-speed flow channel design is adopted at the volute outlet section, and the ratio of the width of the volute outlet to the maximum opening degree is optimized, so that the flow channel of the volute outlet section and the flow channel of the air outlet cover can be in smooth transition, the eddy loss caused by large-angle diffusion and contraction is avoided, the air volume can be greatly improved, and the noise can be greatly reduced.

Description

A twin-turbine centrifugal fan volute for a range hood

technical field

The utility model relates to the technical field of a twin-turbine centrifugal fan, in particular to a volute of a twin-turbine centrifugal fan for a range hood.

Background technique

With the development of society, people use oil absorbers to absorb oil fume when cooking. However, the double-turbine fan with double impellers, double motors, symmetrical arrangement of motors and impellers, and only one common outlet is more and more widely used in range hoods. The air volume is more than 1.5 times that of a single motor; on the other hand, the left and right motors can be controlled separately. It has the effect of saving energy when cooking on one side.

The twin-turbine fan currently on the market, as shown in Figure 1, includes a left wind wheel 1a, a right wind wheel 2a, a left volute 3a, a right volute 4a and an air outlet cover 5a, and the air outlets of the left and right volutes are connected with the air outlets. The hood inlets 6a are connected, the air outlet hood has a single outlet 7a, the outlets 8a and 9a of the left and right volutes adopt the traditional diffuser form, and θ>0, and the outlet width of the volute is much larger than the maximum opening of the volute, that is, H /H1>1.5, but because the outlet of the air outlet hood is small, the air outlet hood produces a large contraction angle α from the inlet to the outlet, which leads to the flow path from the A-A section of the volute outlet to the outlet of the air outlet hood. The trend of contraction after expansion, on the one hand, it will easily cause vortex flow in this part of the flow channel, and on the other hand, it will easily cause backflow and vortex at the volute tongue, resulting in reduced air volume and increased noise.

Contents of the invention

The purpose of this utility model is to aim at the defects and deficiencies of the prior art, to provide a double-turbine centrifugal fan volute for range hoods with simple structure, reasonable design and convenient use. The design of the flow channel, and optimize the ratio of the volute outlet width to the maximum opening degree, so that the flow channel of the volute exit section and the flow channel of the air outlet cover will have a smooth transition, avoiding the eddy current loss caused by large-angle expansion and contraction, which can greatly improve Air volume and noise reduction.

A double-turbine centrifugal fan volute for range hoods according to the utility model includes a volute panel, a volute bottom plate, a left enclosure and a right enclosure; the left and right sides of the volute panel are correspondingly provided with Air inlet holes; the left and right sides of the volute bottom plate are correspondingly provided with motor fixing holes; the projection of the center of the air inlet holes on the left and right sides of the volute panel on the plane where the volute bottom plate is located is the same as the left and right sides of the volute bottom plate. The centers of the motor fixing holes on both sides are coincident; the edge profile of the right enclosure is formed by connecting a straight line AB, a spiral curve BC, a circular arc line CD, and a straight line DE with a smooth transition in sequence, and the straight line AB is perpendicular to the exit section AE of the volute , the straight line AB is tangent to the spiral curve BC at point B, the spiral curve BC is tangent to the arc line CD at point CD, and the arc line CD is tangent to the straight line DE at point D, wherein the spiral curve BC is composed of a single segment, two It is formed by connecting one or more segments of smooth curves with smooth transitions;

The straight line DE in the edge profile of the right enclosure is perpendicular to the outlet section AE of the volute; the left and right enclosures are symmetrically distributed.

Further, the length of the volute outlet section AE is L, and the maximum opening of the helical curve BC (that is, the distance between point B and the outer circle of the impeller) is L1, 1.2≤L/L1≤1.5.

After adopting the above structure, the beneficial effects of the utility model are: the volute of a double-turbine centrifugal fan for a range hood described in the utility model adopts a constant-velocity flow channel design at the volute outlet section, and optimizes the volute outlet The ratio of the width to the maximum opening makes the transition between the outlet section flow channel of the volute and the air outlet cover flow channel very smooth, avoiding the eddy current loss caused by large-angle expansion and contraction, which can greatly increase the air volume and reduce noise.

【Description of drawings】

The accompanying drawings described here are used to provide a further understanding of the utility model and constitute a part of the application, but do not constitute an improper limitation of the utility model. In the accompanying drawings:

Fig. 1 is a schematic structural view of a traditional twin-turbine fan in the background technology;

Fig. 2 is the structural representation of the volute of the utility model twin-turbine blower;

Fig. 3 is a structural schematic diagram of another perspective of the twin-turbine blower volute of the utility model;

Fig. 4 is a view of the volute shroud of the volute of the twin-turbine fan of the present invention viewed from the normal direction of the volute panel.

Explanation of reference signs:

1. Volute panel; 11. Air inlet hole; 2. Volute bottom plate; 21. Motor fixing hole; 3. Left panel; 4. Right panel.

【detailed description】

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the schematic embodiments and descriptions are only used to explain the utility model, but not as a limitation to the utility model.

As shown in Figures 2 to 4, a twin-turbine centrifugal fan volute for range hoods according to this specific embodiment includes a volute panel 1, a volute bottom plate 2, a left enclosure 3 and a right enclosure 4;

The left and right sides of the volute panel 1 are correspondingly provided with air inlet holes 11; the left and right sides of the volute bottom plate 2 are correspondingly provided with motor fixing holes 21; The projection of the center of circle of 11 on the plane where the bottom plate of the volute coincides with the center of the motor fixing holes 21 on the left and right sides of the bottom plate of the volute; The circular arc line CD and the straight line DE are connected, and the straight line AB is perpendicular to the exit section AE of the volute, the straight line AB is tangent to the spiral curve BC at point B, the spiral curve BC is tangent to the circular arc line CD at point CD, and the circular arc The line CD is tangent to the straight line DE at point D, and the spiral curve BC is formed by the smooth transition of a single segment, two segments or multiple segmented smooth curves;

The straight line DE in the edge profile of the right enclosure 4 is perpendicular to the exit section AE of the volute; the left enclosure 3 and the right enclosure 4 are symmetrically distributed.

As a preference of the present invention, the length of the volute outlet section AE is L, and the maximum opening of the spiral curve BC (that is, the distance between point B and the outer circle of the impeller) is L1, 1.2≤L/L1≤1.5.

In the utility model, the straight line DE in the edge profile of the right surrounding plate 4 is perpendicular to the outlet section AE of the volute, so that the flow channel at the outlet section of the volute is a constant-velocity flow channel, thereby avoiding the first expansion and then contraction of the air flow in the flow channel. flow loss.

In the utility model, the length of the volute outlet section AE is L, and the maximum opening degree of the spiral curve BC (that is, the distance between point B and the outer circle of the impeller) is L1. As a preference, 1.2≤L/L1≤1.5, this embodiment selects L/L1=1.328 so that the contraction angle α of the air outlet hood from the inlet to the outlet will be greatly reduced, and the flow loss in the air outlet hood will be greatly reduced.

In the present utility model, the left side panel 3 and the right side panel 4 are symmetrically distributed.

In the utility model, the volute panel 1 is connected with the left enclosure 3 and the right enclosure 4 by butt welding, and the volute bottom plate 2 is connected with the left enclosure 3 and the right enclosure 4 by butt welding.

The volute of a twin-turbine centrifugal fan used in a range hood described in the utility model adopts a constant-velocity flow channel design at the volute exit section, and optimizes the ratio of the volute exit width to the maximum opening degree, so that the flow at the volute exit section There will be a smooth transition between the channel and the flow channel of the air outlet hood, avoiding the vortex loss caused by large-angle diffusion and contraction, which can greatly increase the air volume and reduce noise.

The above is only a preferred embodiment of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application scope are all included in the utility model patent application scope .

Claims (2)

1. a kind of double turbine centrifugal volute of blower used for range hood, it includes spiral case panel（1）, spiral case bottom plate（2）, left coaming plate （3）And right coaming plate（4）；The spiral case panel（1）The upper left and right sides is correspondingly arranged on fresh air inlet（11）；The spiral case bottom plate（2） The upper left and right sides is correspondingly arranged on motor fixing hole（21）；The spiral case panel（1）The left and right sides fresh air inlet（11）Circle The heart spiral case bottom plate projection in the plane, with spiral case bottom plate（2）The motor fixing hole of the left and right sides（21）The center of circle is overlapped；Institute State right coaming plate（4）Edge contour by the straight line AB of rounding off successively, helical curve BC, circular arc line CD and straight line DE connections Form, and straight line AB is vertical with volute outlet section AE, and straight line AB and helical curve BC is tangential on B points, helical curve BC and circle Camber line CD is tangential on CD points, and circular arc line CD and straight line DE is tangential on D points, and wherein helical curve BC is by single hop, two sections or multistage Smooth curve rounding off, which is connected, to be formed；It is characterized in that：The right coaming plate（4）Edge contour in straight line DE go out with spiral case Mouth section AE is vertical；The left coaming plate（3）And right coaming plate（4）Symmetrical distribution.

2. a kind of double turbine centrifugal volute of blower used for range hood according to claim 1, it is characterised in that：The snail Shell outlet section AE length is L, and helical curve BC maximum opening width is L1, and L1 is B points and the cylindrical distance of impeller, 1.2≤ L/L1≤1.5。