CN217783857U - Air-collecting pressurizing noise-reducing centrifugal fan and volute thereof - Google Patents

Abstract

The utility model relates to a fan field especially relates to a centrifugal fan and spiral case of making an uproar falls in collection wind pressurization. A volute comprising a volute body; an air inlet is formed in the axial side face of the volute body, and an air outlet is formed in the circumferential side face of the volute body; a volute cavity which is communicated with the air inlet and is used for installing a centrifugal impeller and an air channel which is communicated with the volute cavity and the air outlet are arranged inside the volute body; at least one side of two inner side walls of the air outlet of the volute body is provided with a guide table, and the inner wall of the guide table is a slope surface which is gradually guided to the middle part of the air outlet from inside to outside, so that the caliber of the air outlet in the width direction is gradually reduced from inside to outside. After the guide table is additionally arranged on the inner wall of the air outlet, the backflow and the turbulence of the air flow are reduced a lot, the air flow is smoother, softer and noise is reduced.

Description

Air-collecting pressurizing noise-reducing centrifugal fan and volute thereof

Technical Field

The utility model relates to a fan field especially relates to a centrifugal fan and spiral case of making an uproar falls in collection wind pressurization.

Background

The centrifugal fan mainly comprises a fan volute and a centrifugal impeller arranged in the fan volute, the shape of the volute is similar to a snail shell, an air inlet is arranged on the axial side surface of the volute, and an air outlet is arranged on the circumferential side surface of the volute; a volute cavity and an air duct communicating the volute cavity with the air outlet are built inside, and the centrifugal impeller is arranged inside the volute cavity. When the centrifugal impeller runs, the centrifugal impeller rotates at a high speed under the driving of the motor, the centrifugal impeller throws airflow out of the air outlet in a centrifugal mode, and meanwhile negative pressure is formed inside the volute cavity so as to feed air from the air inlet.

As shown in fig. 1-2, the air outlet 12 is disposed on the circumferential side surface of the volute body 1, and the centrifugal impeller 3 centrifugally throws the air flow out of the air outlet 12; therefore, as shown in the figure, there is a difference between the upper and lower wind speeds of the airflow in the air duct 14, that is, the wind speed at the upper end (far from the tangent of the centrifugal impeller 3) is higher, and the wind speed at the lower end (close to the tangent of the centrifugal impeller 3) is lower, and based on the difference, a certain turbulent flow is generated, and on the other hand, there is a wind pressure difference between the upper and lower sides of the air duct 14, so that airflow eddies (shown in fig. 1) easily occur around the lower volute tongue. In addition, when the wind resistance of the wind port is high, the air flow is discharged to the wind port direction in a full force manner within the height size range of the impeller, an air flow difference occurs in the gap direction between the impeller and the two side plates, and backflow and turbulent flow occur.

Under the combined action based on above-mentioned three reasons for the noise of fan risees, and the wind pressure reduces.

Disclosure of Invention

In order to solve the above problem, a first object of the present invention is to provide a spiral case, which has a guiding platform on the inner wall of the air outlet, the air flow is returned and disturbed to a great extent, the air flow is smoother, softer and less noisy.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a volute comprising a volute body; an air inlet is formed in the axial side face of the volute body, and an air outlet is formed in the circumferential side face of the volute body; a volute cavity which is communicated with the air inlet and is used for installing a centrifugal impeller and an air channel which is communicated with the volute cavity and the air outlet are arranged inside the volute body; the method is characterized in that: at least one side of two inner side walls of the air outlet of the volute body is provided with a guide table, and the inner wall of the guide table is a slope surface which is gradually guided to the middle part of the air outlet from inside to outside, so that the caliber of the air outlet in the width direction is gradually reduced from inside to outside.

The above technical scheme is adopted in the utility model, this technical scheme relates to a spiral case, and this spiral case has at least to construct on one side in two inside walls of air outlet of spiral case body and has the direction platform on prior art's basis, and the slope of direction platform inner wall construction for leading to the air outlet middle part from interior to exterior gradually makes air outlet width direction's bore diminish from interior to exterior gradually. Under this structure, the air outlet is compared in the air outlet of current spiral case and is reduced, and the wind gap air current gathers, presents spray tube nozzle effect, and air outlet pressure obviously promotes. The air flow backflow of the air inlet of the fan is blocked to a certain extent, and the overall air quantity and air pressure loss of the fan is reduced. Finally, when the fan is used under high pressure, the backflow and the turbulence of airflow are greatly reduced after the guide table is added, the airflow is smoother and softer, and the noise is reduced.

In a further scheme, guide platforms are respectively constructed on two inner side walls of an air outlet of the volute body, and the air outlet is constructed between slope surfaces of the two guide platforms.

Preferably, the outer end of the guide table extends to be flush with the outer end face of the air outlet of the volute body.

Preferably, the minimum caliber of the air outlet formed between the outer ends of the slope surfaces of the two guide platforms is opposite to the axial direction of the blades of the centrifugal impeller installed in the worm cavity, and the width of the blades is equal to the width of the blades. In the scheme, the centrifugal impeller throws airflow out tangentially among the blades, the minimum aperture of the air outlet constructed between the slope surfaces of the two guide tables on the air outlet is axially opposite to the blades of the centrifugal impeller arranged in the volute cavity, and the blades have the same width, so that the air outlet plays a certain role in separating the backflow of the airflow at the air inlet of the fan, and the overall air volume and the air pressure loss of the fan are reduced.

A wind-collecting pressurizing noise-reducing centrifugal fan comprises a volute, a centrifugal impeller arranged in the volute and a motor for driving the centrifugal impeller to rotate; the volute is as described above.

Drawings

Fig. 1 is a schematic structural view of a conventional centrifugal fan.

Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.

Fig. 3 is a perspective view of a volute structure related to the invention.

Fig. 4 is a schematic structural diagram of a centrifugal fan related to the invention.

Fig. 5 is a cut-away perspective view of the centrifugal fan.

Fig. 6 is a front view of the centrifugal fan in a cut-away state.

Fig. 7 is a sectional view B-B of fig. 6.

Fig. 8 is a graph comparing performance curves of the centrifugal fan of the prior art and the centrifugal fan of the invention.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1:

as shown in fig. 3 to 7, the present embodiment relates to a scroll casing including a scroll casing body 1. An air inlet 11 is arranged on the axial side surface of the volute body 1, and an air outlet 12 is arranged on the circumferential side surface. The volute body 1 is provided with a volute cavity 13 communicated with the air inlet 11 and used for installing the centrifugal impeller 3, and an air duct 14 for communicating the volute cavity 13 with the air outlet 12. At least one side of two inner side walls of the air outlet 12 of the volute body 1 is provided with a guide platform 15, and the inner wall of the guide platform 15 is provided with a slope surface 151 which guides the air outlet 12 from inside to outside gradually, so that the caliber of the air outlet 12 in the width direction is gradually reduced from inside to outside. In a further scheme shown in the figure, guide platforms 15 are respectively constructed on two inner side walls of the air outlet 12 of the volute body 1, and the air outlet 12 is constructed between the slope surfaces 151 of the two guide platforms 15; the outer end of the guide table 15 extends to be flush with the outer end face of the air outlet 12 of the volute body 1.

As further shown in fig. 7, the minimum diameter of the air outlet 12 formed between the outer ends of the slope surfaces 151 of the two guide platforms 15 is axially opposite to and equal to the width of the blade 31 of the centrifugal impeller 3 installed in the worm cavity 13.

The above technical scheme is adopted in the utility model, this technical scheme relates to a spiral case, and this spiral case has at least to construct direction platform 15 on one side in two inside walls of air outlet 12 of spiral case body 1 on prior art's basis, and the slope 151 of direction platform 15 inner walls construction to air outlet 12 middle part direction from interior to exterior gradually makes 12 width direction's of air outlet bore from interior to exterior diminish gradually. Under this structure, the air outlet 12 compares and reduces in the air outlet 12 of current spiral case, and the wind gap air current gathers, presents spray tube nozzle effect, and air outlet 12 pressure obviously promotes. The air flow backflow at the air inlet of the fan is blocked to a certain extent; specifically, the centrifugal impeller 3 throws the airflow out tangentially between the blades 31, the minimum caliber of the air outlet 12 constructed between the slope surfaces 151 of the two guide platforms 15 on the air outlet 12 is axially opposite to and equal in width to the blades 31 of the centrifugal impeller 3 installed in the volute 13, and then a certain separation effect is achieved on the backflow of the airflow at the air inlet of the fan, and the overall air volume and air pressure loss of the fan is reduced.

Finally, when the fan is used under high pressure, the backflow and the turbulent flow of the air flow are greatly reduced after the guide table 15 is added, the air flow is smoother and softer, and the noise is reduced.

Example 2:

as shown in fig. 4-7, the present embodiment relates to a wind-collecting, pressurizing and noise-reducing centrifugal fan, which includes a volute, a centrifugal impeller 3 disposed inside the volute, and a motor for driving the centrifugal impeller 3 to rotate. The volute is as described in embodiment 1.

Referring to fig. 8, it can be seen that the centrifugal fan provided by the present invention provides a larger air volume under the same static pressure for the static pressure-flow curve of the existing centrifugal fan and the centrifugal fan provided by the present invention; under the same air quantity, the static pressure provided by the centrifugal fan is larger. Thus, the centrifugal fan of the scheme has the advantages of reduced overall air quantity and air pressure loss,

in the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the invention, and that those skilled in the art may make variations, modifications, substitutions and alterations herein without departing from the spirit and scope of the invention.

Claims (5)

1. A volute comprising a volute body (1); an air inlet (11) is formed in the axial side face of the volute body (1), and an air outlet (12) is formed in the circumferential side face of the volute body; a volute cavity (13) which is communicated with the air inlet (11) and is used for mounting the centrifugal impeller (3) and an air channel (14) which is communicated with the volute cavity (13) and the air outlet (12) are arranged in the volute body (1); the method is characterized in that: at least one side of two inner side walls of the air outlet (12) of the volute body (1) is provided with a guide table (15), the inner wall of the guide table (15) is provided with a slope surface (151) which guides towards the middle part of the air outlet (12) from inside to outside gradually, so that the caliber of the air outlet (12) in the width direction is gradually reduced from inside to outside.

2. A spiral casing as claimed in claim 1, wherein: guide platforms (15) are respectively constructed on the two inner side walls of the air outlet (12) of the volute body (1), and the star-shaped air outlet (12) is constructed between the slope surfaces (151) of the two guide platforms (15).

3. A spiral casing as claimed in claim 2, wherein: the outer end part of the guide table (15) extends to be flush with the outer end face of the air outlet (12) of the volute body (1).

4. A spiral casing as claimed in claim 2, wherein: the minimum caliber of the air outlet (12) formed between the outer ends of the slope surfaces (151) of the two guide platforms (15) is opposite to the axial direction of the blade (31) of the centrifugal impeller (3) arranged in the worm cavity (13) and the width of the blade is equal.

5. A wind-collecting pressurizing noise-reducing centrifugal fan comprises a volute, a centrifugal impeller (3) arranged inside the volute and a motor for driving the centrifugal impeller (3) to rotate; the method is characterized in that: the volute is a volute of any of claims 1-4.

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