CN217327819U - Centrifugal fan and volute thereof - Google Patents

Abstract

The utility model relates to a fan spiral case field especially relates to a centrifugal fan and spiral case thereof. A volute includes a metallic volute body; a volute cavity for mounting a centrifugal impeller is arranged inside the 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; the volute body is characterized in that a blocking wall and a volute tongue are formed on two sides of an air outlet of the volute body respectively, and the volute tongue inclines from inside to outside away from one side of the blocking wall, so that the caliber of the air outlet formed between the volute tongue and the blocking wall is gradually increased from inside to outside. The volute tongue in the volute is inclined from inside to outside to one side far away from the baffle wall, so that the air outlet is gradually enlarged from inside to outside. The air flow resistance is reduced due to the increase of the air outlet area, the influence range of the back vortex area at the outlet of the volute is effectively improved, the static pressure and the pneumatic performance of the centrifugal fan are further improved, and the noise is reduced.

Description

Centrifugal fan and volute thereof

Technical Field

The utility model relates to a fan spiral case field especially relates to a centrifugal fan and spiral case thereof.

Background

The centrifugal fan mainly comprises a fan volute and an impeller arranged in the fan volute, the volute mainly comprises a cylinder body provided with the impeller and an air outlet connected to the cylinder body, and air is blown at the air outlet through rotation of the impeller. Among the current centrifugal fan, in order to reduce the noise that the fan work produced, can set up amortization materials such as amortization cotton usually on the barrel inner wall of spiral case, though the effect of making an uproar falls can be played to this kind of spiral case, still has certain not enough when in actual use: because the amortization cotton sets up on the spiral case inner wall, when needs are changed the amortization cotton, because the existence of impeller, can shelter from the inner wall of spiral case for be difficult to directly change the amortization cotton, need dismantle the impeller with the elder generation in order to vacate the space, it is very inconvenient to operate, so still remain to improve.

Disclosure of Invention

In order to solve the above problem, a first object of the present invention is to provide a spiral casing, wherein a spiral tongue of the spiral casing is inclined from inside to outside away from one side of a baffle wall, so that an air outlet is gradually enlarged from inside to outside. The air flow resistance is reduced due to the increase of the air outlet area, the influence range of the back vortex area at the outlet of the volute is effectively improved, the static pressure and the pneumatic performance of the centrifugal fan are further improved, and the noise is reduced.

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

a volute includes a metallic volute body; a volute cavity for mounting a centrifugal impeller is arranged inside the 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; the method is characterized in that: the volute comprises a volute body and is characterized in that a blocking wall and a volute tongue are respectively formed on two sides of an air outlet of the volute body, and the volute tongue inclines from inside to outside to one side far away from the blocking wall, so that the caliber of the air outlet formed between the volute tongue and the blocking wall is gradually increased from inside to outside.

The utility model adopts the technical scheme, which relates to a spiral case, and adopts a metal spiral case body; the volute cavity inside the volute body is used for installing a centrifugal impeller. When the centrifugal impeller runs, the motor drives the centrifugal impeller to rotate, the centrifugal impeller forms negative pressure in the cavity of the volute, airflow is introduced from the air inlet, and the airflow is thrown out from the air outlet. On the basis, the two sides of the air outlet are respectively provided with the baffle wall and the volute tongue, and the volute tongue inclines from inside to outside away from one side of the baffle wall, so that the air outlet is gradually enlarged from inside to outside. Compared with a volute in the prior scheme, the scheme increases the air outlet area, reduces the airflow resistance due to the increase of the air outlet area under the condition of the same flow, effectively improves the influence range of the back vortex area at the outlet of the volute, further improves the static pressure and the pneumatic performance of the centrifugal fan, and reduces the noise.

In a specific embodiment, the volute body comprises a side coaming and two end plates connected to two axial end parts of the side coaming; the side coaming is bent, two end parts of the side coaming are respectively constructed to form a retaining wall and a volute tongue, and an air outlet is constructed between the two end parts; the middle of at least one end plate is constructed to form an air inlet. In a further preferred embodiment, the middle of the two end plates is constructed to form the air inlet. In the technical scheme, the side wall of the volute body is constructed by bending the side wall plate, two end parts of the side wall plate are respectively constructed to form a retaining wall and a volute tongue, and an air inlet is formed between the retaining wall and the volute tongue; by adopting the forming structure, the forming process is simpler.

Preferably, an axially protruding convex ring is arranged on the end plate at the edge of the air inlet, and a space enclosed by the convex ring forms the air inlet; the inner ring part of the convex ring inclines downwards towards the air inlet. In the technical scheme, the convex ring is constructed on the end plate, the inner ring part of the convex ring inclines downwards to the air inlet, the inner ring part of the convex ring can guide air flow to the centrifugal wind wheel, the air inlet area can be increased by arranging the convex ring, vortex is reduced, and therefore noise is reduced.

Preferably, two end parts of the side wall plate of the volute body are respectively provided with an outward bent flange, and the flanges are used for supporting when the volute is connected and installed.

A second object of the present invention is to provide a centrifugal fan, which includes a volute, a centrifugal impeller disposed inside the volute, and a motor for driving the centrifugal impeller to rotate; the method is characterized in that: the volute is as described above.

Preferably, air inlets are formed in the two axial side surfaces of the volute body, the centrifugal impeller is a double-air-inlet impeller, and two air inlet ends of the double-air-inlet impeller are opposite to the two air inlets in the volute body. The centrifugal impeller in the scheme adopts a double-air-inlet impeller, and air inlets are formed in two sides of the volute body, so that the air quantity of the fan can be increased.

Drawings

Fig. 1 is a perspective view of the volute described in embodiment 1.

Fig. 2 is a developed view of the scroll casing described in embodiment 1.

FIG. 3 is a schematic view of the centrifugal fan described in example 2.

Detailed Description

Reference will now be made in detail to 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 function 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 implicitly indicating 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. 1 to 2, the present embodiment relates to a scroll casing including a metal scroll casing body 1. The volute body 1 is internally provided with a volute cavity 10 for mounting a centrifugal impeller, an air inlet 101 is formed in the axial side surface of the volute body 1, and an air outlet 102 is formed in the circumferential side surface of the volute body 1. A baffle wall 111 and a volute tongue 112 are respectively formed on two sides of the air outlet 102 of the volute body 1, and the volute tongue is inclined from inside to outside away from one side of the baffle wall, so that the caliber of the air outlet 102 formed between the volute tongue and the baffle wall is gradually increased from inside to outside. The volute adopts a metal volute body 1. The volute chamber 10 inside the volute body 1 is used for mounting a centrifugal impeller. When the air conditioner is operated, the motor drives the centrifugal impeller to rotate, the centrifugal impeller forms negative pressure inside the volute 10, air flow is introduced from the air inlet 101, and the air flow is thrown out from the air outlet 102. On the basis, a blocking wall and a volute tongue are respectively formed on two sides of the air outlet 102, and the volute tongue inclines from inside to outside away from one side of the blocking wall, so that the air outlet 102 is gradually enlarged from inside to outside. Compared with a volute in the prior scheme, the scheme increases the air outlet area, reduces the airflow resistance due to the increase of the air outlet area under the condition of the same flow, effectively improves the influence range of the back vortex area at the outlet of the volute, further improves the static pressure and the pneumatic performance of the centrifugal fan, and reduces the noise.

In a specific embodiment, the volute body 1 includes a side shroud 11, and two end plates 12 connected to both axial ends of the side shroud 11. The side enclosing plate 11 is arranged in a bent mode, two end portions of the side enclosing plate 11 are respectively constructed to form a blocking wall 111 and a volute tongue 112, and an air outlet 102 is constructed between the two end portions. The central portion of at least one of the end plates 12 is configured to form an intake vent 101. In a further preferred embodiment, the middle of the two end plates 12 is configured to form the air inlet 101. In the technical scheme, the side wall of the volute body 1 is constructed by bending the side enclosing plate 11, the two end parts of the side wall are respectively constructed to form a blocking wall 111 and a volute tongue 112, and an air inlet 101 is formed between the blocking wall and the volute tongue; by adopting the forming structure, the forming process is simpler. In addition, two end portions of the side wall plate 11 of the volute body 1 are both provided with outward bent flanges 113, specifically, the flanges 113 obtained by bending two end portions of the side wall plate 11 in opposite directions are used for supporting the volute when the volute is installed in a connected manner.

In a further scheme, an axially protruding convex ring 121 is arranged on the end plate 12 at the edge of the air inlet 101, and a space enclosed by the convex ring 121 constitutes the air inlet 101. The inner ring part of the convex ring 121 is inclined downwards towards the air inlet 101. In the technical scheme, the convex ring 121 is constructed on the end plate 12, the inner ring part of the convex ring 121 inclines downwards towards the air inlet 101, the inner ring part of the convex ring can guide air flow into the centrifugal wind wheel, the arrangement of the convex ring 121 can increase the air inlet area, reduce vortex flow and reduce noise.

Example 2:

as shown in fig. 3, the present embodiment provides a centrifugal fan, which includes a volute, a centrifugal impeller 2 disposed inside the volute, and a motor for driving the centrifugal impeller 2 to rotate. The volute is as described in example 1. In this scheme, all be equipped with air intake 101 on the axial both sides face of spiral case body 1, centrifugal impeller 2 is two air inlet impellers, and two air inlet ends of two air inlet impellers are relative with two air intake 101 on the spiral case body 1. The centrifugal impeller 2 in the scheme adopts a double-air-inlet impeller, and the two sides of the volute body 1 are provided with air inlets 101, so that the air quantity of the fan can be increased.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 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 to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims (7)

1. A volute includes a volute body (1) made of metal; a volute cavity (10) for mounting a centrifugal impeller (2) is arranged in the volute body (1), an air inlet (101) is formed in the axial side face of the volute body (1), and an air outlet (102) is formed in the circumferential side face of the volute body (1); the method is characterized in that: two sides of an air outlet (102) of the volute body (1) are respectively provided with a baffle wall (111) and a volute tongue (112), and the volute tongue (112) inclines from inside to outside to one side far away from the baffle wall (111) so that the caliber of the air outlet (102) formed between the volute tongue (112) and the baffle wall (111) is gradually increased from inside to outside.

2. A spiral casing as claimed in claim 1, wherein: the volute body (1) comprises side enclosing plates (11) and two end plates (12) connected to the two axial end parts of the side enclosing plates (11); the side enclosing plate (11) is arranged in a bending mode, two end portions of the side enclosing plate (11) are respectively constructed to form a blocking wall (111) and a volute tongue (112), and an air outlet (102) is constructed and formed between the two end portions; the central portion of at least one end plate (12) is configured to form an air inlet (101).

3. A spiral casing as claimed in claim 2, wherein: the middle parts of the two end plates (12) are constructed to form an air inlet (101).

4. A spiral casing as claimed in claim 2, wherein: an axially protruding convex ring (121) is arranged on an end plate (12) at the edge of the air inlet (101), and a space enclosed by the convex ring (121) forms the air inlet (101); the inner ring part of the convex ring (121) inclines downwards towards the air inlet (101).

5. A spiral casing as claimed in claim 2 wherein: two ends of the side wall plate (11) of the volute body (1) are respectively provided with a flanging (113) which is bent outwards.

6. A centrifugal fan comprises a volute, a centrifugal impeller (2) arranged inside the volute and a motor for driving the centrifugal impeller (2) to rotate; the method is characterized in that: the volute is a volute of any of claims 1-5.

7. The centrifugal fan according to claim 6, wherein: the volute comprises a volute body (1) and is characterized in that air inlets (101) are formed in two axial side faces of the volute body (1), the centrifugal impeller (2) is a double-air-inlet impeller, and two air inlet ends of the double-air-inlet impeller are opposite to the two air inlets (101) in the volute body (1).

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