CN213450997U - Volute tongue and centrifugal fan provided with same - Google Patents

Abstract

The utility model discloses a volute tongue and install centrifugal fan of this volute tongue, the volute tongue includes volute tongue body, its characterized in that: the volute tongue body is internally provided with a mounting cavity, the volute tongue body is provided with a turbulent flow hole, a fan is arranged in the mounting cavity, and an air outlet of the fan is communicated with the turbulent flow hole. The centrifugal fan comprises a volute and an impeller arranged in the volute, and the volute tongue is arranged at the outlet of the volute. Compared with the prior art, the utility model has the advantages of: the volute tongue body of the volute tongue is internally provided with the mounting cavity, the fan is mounted in the mounting cavity, the air outlet of the fan is communicated with the turbulent flow hole in the volute tongue body, and after the volute tongue is mounted on the centrifugal fan, the fluid flow characteristic near the volute tongue can be improved, eddy current is reduced, and then fan noise is reduced, and fan performance is improved.

Description

Volute tongue and centrifugal fan provided with same

Technical Field

The utility model relates to a snail tongue and install centrifugal fan of this snail tongue.

Background

The main function of the volute tongue of the fan for the range hood is to cut off (prevent the impeller from driving airflow to rotate in an idle mode but not go out), generally speaking, the volute tongue can be divided into a sharp tongue, a deep tongue, a short tongue and a flat tongue, and for a traditional straight volute tongue, the deeper the volute tongue is, the smaller the gap between the volute tongue and the impeller is, the higher the efficiency is, but the higher the noise is. The distribution of the flow speed of the air flow in the volute along the axis direction is basically the quadratic curve distribution with large middle flow speed and small flow speed at two ends, and the result of fluid simulation analysis shows that the secondary flow flowing towards the left side and the right side in the middle is obvious to form large vortex near the air outlet of the fan due to the large middle speed and the small speed at the two ends, and the phenomenon is ubiquitous in the traditional straight volute tongue fan.

In order to reduce fan noise and eliminate vortexes, the structure of a volute tongue is improved, for example, in a fan of a range hood and a range hood with the fan, which are disclosed in chinese patent application with application number 201110427490.X (application publication number CN 102518603a), a concave portion which is concave to the outer side of a volute casing is formed on the volute tongue portion of the volute casing, so that the concave portion is arc-shaped when viewed from a direction of an air outlet, although airflow at the concave portion can be rectified by the arrangement of the concave portion, noise generated at the volute tongue portion when the range hood works is reduced, the size of a gap between the lower end surface of the volute tongue and an impeller is the same, and vortexes are easily generated at the front side and the rear side of the volute tongue when the fan works. In conclusion, the existing volute tongue and fan structure needs to be further improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a first technical problem that will solve is to above-mentioned prior art current situation, provides a can improve near the spiral tongue fluid flow characteristic's spiral tongue.

The utility model discloses the second technical problem that will solve is to above-mentioned prior art current situation, provides one kind and can effectively reduce near vortex of snail tongue, the less centrifugal fan of noise.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: this snail tongue, including snail tongue body, its characterized in that: the volute tongue body is internally provided with a mounting cavity, the volute tongue body is provided with a flow disturbing hole, a fan is mounted in the mounting cavity, and an air outlet of the fan is communicated with the flow disturbing hole.

The baffle body is provided with an outer convex part protruding outwards towards the airflow side, and the baffle holes are arranged on the side surface of the outer convex part towards the airflow side and are distributed at intervals along the length direction of the outer convex part.

Further preferably, the diameter of the turbulent hole in the middle of the convex portion is the largest, the diameters of the turbulent holes on both sides of the convex portion in the length direction are the smallest, and the diameters of the turbulent holes become smaller from the middle to both sides. Because the swirl of outer convex part middle zone is the biggest, and the swirl of outer convex part both sides is minimum, adopt behind the above-mentioned structure, can reduce the swirl to the at utmost, promote the stability of air current.

More preferably, the hole pitch of the adjacent baffle holes in the length direction of the outer convex part is 20-25 mm.

More preferably, the aperture D of the turbulent flow hole and the length L of the volute tongue body meet the condition that D is 0.02-0.05L.

Further preferably, the spoiler holes are arranged in one row or two rows along the length direction of the outer convex part.

In order to obtain better flow stabilizing effect, the fan is arranged in the middle of the mounting cavity, and the air outlet of the fan faces to the turbulence hole in the middle of the outer convex part.

The utility model provides a technical scheme that above-mentioned second technical problem adopted does: the centrifugal fan comprises a volute and an impeller arranged in the volute, and the volute tongue is arranged at the outlet of the volute.

Compared with the prior art, the utility model has the advantages of: the volute tongue body of the volute tongue is internally provided with the mounting cavity, the fan is mounted in the mounting cavity, the air outlet of the fan is communicated with the turbulent flow hole in the volute tongue body, and after the volute tongue is mounted on the centrifugal fan, the fluid flow characteristic near the volute tongue can be improved, eddy current is reduced, and then fan noise is reduced, and fan performance is improved.

Drawings

FIG. 1 is a schematic view of the volute tongue structure of the present invention;

FIG. 2 is a schematic view of the interior of the volute tongue shown in FIG. 1;

FIG. 3 is a schematic structural view of the centrifugal fan of the present invention (with the impeller removed);

fig. 4 is a schematic structural view of the centrifugal fan of the present invention;

fig. 5 is a schematic view of another volute tongue structure of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 and 2, the volute tongue of the present embodiment includes a volute tongue body 1, a mounting cavity 2 is formed inside the volute tongue body 1, and the volute tongue body 1 forms an outer convex portion 11 protruding outward toward the airflow side. A fan 4 is installed in the installation cavity 2, a turbulent flow hole 3 is formed in the side face, facing the airflow side, of the outer convex portion 11, and an air outlet of the fan 4 is communicated with the turbulent flow hole 3. The spoiler holes 3 are spaced apart from each other along the longitudinal direction of the outer protrusion 11. Fan 4 is installed in the middle part of installation cavity 2, and the air outlet of fan 4 is towards the vortex hole 3 in 11 middle parts of evagination.

In this embodiment, the spoiler holes 3 are arranged in a row along the length direction of the outer convex portion 11, the hole pitch of the adjacent spoiler holes 3 in the length direction of the outer convex portion 11 is 20-25 mm, and the aperture D of the spoiler hole 3 and the length L of the volute tongue body 1 satisfy D-0.02-0.05L.

As shown in fig. 3 and 4, the centrifugal fan of the present embodiment includes a volute 5 and an impeller 6 disposed in the volute, and a volute tongue of the present embodiment is mounted at an outlet of the volute 5.

Because the vortex is usually present near the volute tongue of the centrifugal fan, the airflow of the fan is unstable, and the noise is large. After the volute tongue structure of the embodiment is adopted by the centrifugal fan, the fluid flow characteristic near the volute tongue can be improved, the eddy current is reduced, the fan noise is reduced, and the fan performance is improved.

As shown in fig. 5, the burbling holes 3 are arranged in two rows along the length direction of the convex part 11, and the rest of the structure is the same as the volute tongue structure shown in fig. 1, and the description is not repeated.

In addition, because the swirl is the largest in the middle area of the convex portion 11 and the swirl is the smallest on both sides of the convex portion 11, the hole diameter of the turbulent hole 3 can also be distributed as follows: the aperture of the vortex hole 3 in the middle of the outer convex part 11 is the largest, the aperture of the vortex hole 3 on both sides of the length direction of the outer convex part 11 is the smallest, and the aperture of the vortex hole 3 is gradually reduced from the middle to both sides, so that the vortex can be reduced to the greatest extent, and the stability of the airflow is improved.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, the present invention can be modified or improved without departing from the principle of the present invention, and these modifications are all considered to be within the protection scope of the present invention.

Claims (8)

1. A volute tongue comprises a volute tongue body (1) and is characterized in that: the volute tongue is characterized in that a mounting cavity (2) is formed inside the volute tongue body (1), a flow disturbing hole (3) is formed in the volute tongue body (1), a fan (4) is installed in the mounting cavity (2), and an air outlet of the fan (4) is communicated with the flow disturbing hole (3).

2. The volute tongue of claim 1, wherein: the volute tongue body (1) is provided with an outer convex part (11) protruding outwards towards the airflow side, and the turbulence holes (3) are formed in the side surface, facing the airflow side, of the outer convex part (11) and are distributed at intervals along the length direction of the outer convex part (11).

3. The volute tongue of claim 2, wherein: the diameter of the turbulent flow hole (3) in the middle of the outer convex part (11) is the largest, the diameters of the turbulent flow holes (3) on two sides of the length direction of the outer convex part (11) are the smallest, and the diameters of the turbulent flow holes (3) are gradually reduced from the middle to two sides.

4. The volute tongue of claim 2, wherein: the hole spacing of the adjacent turbulent flow holes (3) in the length direction of the outer convex part (11) is 20-25 mm.

5. The volute tongue of claim 2, wherein: the aperture D of the flow disturbing hole (3) and the length L of the volute tongue body (1) meet the condition that D is 0.02-0.05L.

6. The volute tongue of claim 2, wherein: the flow disturbing holes (3) are arranged in one row or two rows along the length direction of the outer convex part (11).

7. The volute tongue of claim 2, wherein: fan (4) are installed the middle part of installation cavity (2), the air outlet of fan (4) is towards the vortex hole (3) in evagination portion (11) middle part.

8. A centrifugal fan provided with a volute tongue as claimed in any one of claims 1 to 7, comprising a volute (5) and an impeller (6) arranged in the volute, the volute tongue being mounted at the outlet of the volute (5).

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