CN115898952A - Volute tongue, shell assembly, fan and air conditioner - Google Patents

Abstract

The disclosure relates to a volute tongue, a shell assembly, a fan and an air conditioner. The volute tongue comprises: a volute tongue surface configured to have airflow flowing therethrough, the volute tongue surface including a middle region and side regions on either side of the middle region; and the flow guide piece is arranged on the surface of the volute tongue, the middle area and the side area are respectively provided with at least one flow guide piece, and the length of the flow guide piece positioned in the middle area is smaller than that of the flow guide piece positioned in the side area. The volute tongue surface is divided into a middle area and side areas located on two sides of the middle area, at least one flow guide piece is arranged on each of the middle area and the side areas, the length of the flow guide piece located in the middle area is smaller than that of the flow guide piece located in the side areas, airflow on the volute tongue surface can be effectively guided, extra noise is avoided, the airflow flowing through the volute tongue surface is cut, large eddy is prevented from being generated, eddy noise caused by contact between the airflow and the volute tongue surface and falling can be effectively reduced, and accordingly aerodynamic noise of the fan is reduced.

Description

Volute tongue, shell assembly, fan and air conditioner

Technical Field

The disclosure relates to the field of fluid machinery, in particular to a volute tongue, a shell assembly, a fan and an air conditioner.

Background

In some related technologies, the air conditioner includes a centrifugal fan, and due to a structural problem, backflow often occurs at a volute tongue of the centrifugal fan, so that additional pneumatic noise is generated, and the use comfort is affected.

Disclosure of Invention

Some embodiments of the present disclosure provide a volute tongue, a housing assembly, a fan and an air conditioner, which are used for alleviating the problem of noise caused by backflow at the volute tongue.

In one aspect of the present disclosure, there is provided a volute tongue comprising:

a volute tongue surface configured to have airflow therethrough, the volute tongue surface comprising a central region and side regions on either side of the central region; and

the flow guide piece is arranged on the surface of the volute tongue, the middle area and the side area are respectively provided with at least one flow guide piece, and the length of the flow guide piece positioned in the middle area is smaller than that of the flow guide piece positioned in the side area.

In some embodiments, the length of the flow guide extends in a direction parallel to the direction of airflow over the volute tongue surface.

In some embodiments, an upstream end of the baffle in the middle region is flush with an upstream end of the baffle in the side region in a direction of airflow over the volute tongue surface.

In some embodiments, the side region is further divided into at least two sections along the direction from the middle region to the side region, at least one flow guide element is arranged in each of the at least two sections, and the length of the flow guide element in the section close to the middle region is smaller than that in the section far from the middle region.

In some embodiments, the length of the flow guides within the same zone is the same.

In some embodiments, the baffle projects away from the volute tongue surface, and a maximum projection height of the baffle in a zone proximate to the central region is less than a maximum projection height of the baffle in a zone distal from the central region.

In some embodiments, the length of the flow guides in the central region is the same.

In some embodiments, the side regions on a first side of the central region are symmetrically disposed with respect to the side regions on a second side of the central region, the first and second sides being opposite sides of the central region.

In some embodiments, the baffle is raised away from the volute tongue surface, and the maximum raised height of the baffle in the middle region is less than the maximum raised height of the baffle in the side regions.

In some embodiments, the flow guide is convex away from the volute surface, the profile of the outer edge of the flow guide is a curve, and the flow guide comprises a leading edge section located upstream, a trailing edge section located downstream, and a middle section connecting the leading edge section and the trailing edge section in the direction of the airflow flowing over the volute surface.

In some embodiments, the leading edge segment has a convex height that gradually increases from zero and the trailing edge segment has a convex height that gradually decreases from greater than zero to zero in the direction of airflow over the volute tongue surface.

In some embodiments, the point of maximum raised height of the baffle is located at the middle section.

In some embodiments, the point of maximum raised height of the flow guides in the central region is adjacent to the trailing edge section and the point of maximum raised height of the flow guides in the side regions is adjacent to the leading edge section.

In some embodiments, the profile control equation for the leading edge segment is:

wherein A is the ratio of the maximum protruding height of the flow guide piece to the length of the volute tongue surface, the value range of A is 0.03-0.15, C is the length of the volute tongue surface, lambda is the ratio of the distance between two identical flow guide pieces in the same area to the length of the volute tongue surface, and the value range of lambda is 0.02-0.12; the length of the volute tongue surface is the dimension along the flow direction of the airflow flowing through the volute tongue surface.

In some embodiments, the ratio of the length of the trailing edge segment to the length of the flow guide is in the range of 0.16 to 0.2.

In some embodiments, the length of the flow guide furthest from the middle region is equal to the length of the volute tongue surface, and the length extension direction of the flow guide, the length direction of the volute tongue surface and the flow direction of the airflow flowing through the volute tongue surface are parallel to each other.

In some embodiments, the flow guide is configured to be obtained by cutting the airfoil along a chord direction of the airfoil.

In one aspect of the present disclosure, a casing assembly is provided, which includes a volute casing and the above volute tongue, and the volute tongue is arranged at an outlet of the volute casing.

In one aspect of the present disclosure, a fan is provided, which includes a fan blade and the above-mentioned housing assembly, where the fan blade is disposed in the volute of the housing assembly.

In one aspect of the present disclosure, an air conditioner is provided, which includes a heat exchange member and the fan described above.

Based on the technical scheme, the method has the following beneficial effects:

in some embodiments, according to the characteristics that the air flow flowing through the middle area of the volute tongue surface is the largest, and the air flow on two sides of the middle area is small, the volute tongue surface is divided into the middle area and the side areas positioned on two sides of the middle area, the middle area and the side areas are respectively provided with at least one flow guide piece, the length of the flow guide piece positioned in the middle area is smaller than that of the flow guide piece positioned in the side areas, the air flow on the volute tongue surface can be effectively guided, extra noise is avoided, the air flow flowing through the volute tongue surface is cut, large eddy is prevented from being generated, the falling eddy noise generated by the contact of the air flow and the volute tongue surface can be effectively reduced, and further the aerodynamic noise of the fan is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

FIG. 1 is a schematic illustration of a wind turbine provided in accordance with some embodiments of the present disclosure;

FIG. 2 is a schematic view of a housing assembly provided in accordance with some embodiments of the present disclosure where a volute tongue is located;

FIG. 3 is a schematic illustration of zoning of a surface of a volute tongue provided in accordance with some embodiments of the present disclosure;

FIG. 4 is a schematic view of a baffle provided in accordance with some embodiments of the present disclosure;

FIG. 5 is a schematic top view of two adjacent identical flow guides provided according to some embodiments of the present disclosure;

fig. 6 is a schematic top view of a flow guide provided in accordance with some embodiments of the present disclosure;

fig. 7 is an airfoil cross-sectional schematic view of a flow guide for various regions of a volute tongue provided in accordance with some embodiments of the present disclosure.

The reference numbers in the figures are as follows:

1-volute tongue surface;

2-a flow guide part; 201-a leading edge segment; 202-a trailing edge segment; 203-middle section;

30-70% spanwise length of airfoil section; an aerofoil section of 31-60% spanwise length; an aerofoil section of 32-50% spanwise length; an aerofoil section of 33-40% spanwise length; an aerofoil section of 34-30% spanwise length; an aerofoil section of 35-20% spanwise length; an aerofoil section of 36-10% spanwise length;

a-a middle region;

b-a side region; b1-partitioning; b11 — first partition; b12-a second partition; b13-third partition; b14 — fourth partition; b15-a fifth partition; b16 — sixth partition;

100-a volute; 200-volute tongue; 300-fan blades; 400-a fan.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not restrictive, unless specifically stated otherwise.

The use of "first," "second," and similar words in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a particular device is described as being located between a first device and a second device, intervening devices may or may not be present between the particular device and the first device or the second device. When a particular device is described as being coupled to another device, it can be directly coupled to the other device without intervening devices or can be directly coupled to the other device with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

Referring to fig. 1, in some embodiments, a wind turbine includes a fan blade 300 and a housing assembly. Wherein the housing assembly includes a volute 100 and a volute tongue 200. The fan blade 300 is disposed in the volute 100. The volute tongue 200 is provided at the outlet of the volute 100.

Referring to fig. 2, in some embodiments, the volute tongue 200 includes a volute tongue surface 1 and a flow guide 2. The volute tongue surface 1 is configured to have airflow flowing through it.

Referring to fig. 3, the volute surface 1 includes a central region a and side regions B on both sides of the central region a.

The flow guide part 2 is arranged on the volute tongue surface 1, the middle area A and the side area B are respectively provided with at least one flow guide part 2, and the length of the flow guide part 2 positioned in the middle area A is smaller than that of the flow guide part 2 positioned in the side area B.

When the fan works, when airflow flows through the surface of the volute tongue, the volute tongue 200 in the related art is of a smooth flat plate structure and cannot guide the airflow, so that the airflow reflows at the volute tongue 200, and further extra aerodynamic noise is generated.

Based on this, the embodiment of the present disclosure provides the flow guiding element 2 on the volute tongue surface 1, and according to the characteristics that the gas flow of the middle area a of the volute tongue surface is the largest and the gas flow of the two sides of the middle area a is small, the volute tongue surface 1 is divided into the middle area a and the side areas B located at the two sides of the middle area a, at least one flow guiding element 2 is respectively disposed in each of the middle area a and the side areas B, and the length of the flow guiding element 2 located in the middle area a is smaller than that of the flow guiding element 2 located in the side areas B, so that the gas flow on the volute tongue surface 1 can be effectively guided, the generation of extra noise is avoided, the gas flow passing through the volute tongue surface 1 is cut, the generation of large eddy is prevented, the shedding noise generated by the gas flow contacting with the volute tongue surface 1 can be effectively reduced, and further the aerodynamic noise of the fan is reduced.

In some embodiments, the length of the flow guide 2 extends in a direction parallel to the direction of airflow over the volute tongue surface 1.

Referring to fig. 4 and 5, the flow direction of the air flowing through the volute tongue surface 1 is parallel to the first direction X, and the length extension direction of the flow guide 2 is parallel to the first direction X. The direction from the central region a to the side region B is parallel to the second direction Y. The arrangement direction of two adjacent flow guides 2 is parallel to the second direction Y. The direction of the bulge of the baffle 3 is parallel to the third direction Z.

Referring to fig. 3, in some embodiments, the upstream end of the baffle 2 in the middle region a is flush with the upstream end of the baffle 2 in the side region B in the direction of the airflow over the volute tongue surface 1.

Because the length of the flow guide part 2 positioned in the middle area A is smaller than that of the flow guide part 2 positioned in the side area B, along the flow direction of the airflow flowing through the volute tongue surface 1, the upstream end of the flow guide part 2 positioned in the middle area A is flush with the upstream end of the flow guide part 2 positioned in the side area B, so that the extension positions of the downstream end of the flow guide part 2 positioned in the middle area A and the downstream end of the flow guide part 2 positioned in the side area B are different, the upstream end of each flow guide part 2 forms a sawtooth structure, the extension positions of the downstream ends of each flow guide part 2 also form a sawtooth structure, and the sawtooth structures of the upstream section and the downstream section of the volute tongue surface 1 can effectively cut the airflow generated by the fan, thereby avoiding the generation of large-scale vortex and further reducing noise.

Referring to fig. 3, in some embodiments, along the direction from the central region a to the side region B (the second direction Y), the side region B is further divided into at least two sub-regions B1, each sub-region B1 of the at least two sub-regions B1 is provided with at least one flow guide element 2, and the length of the flow guide element 2 in the sub-region B1 close to the central region a is smaller than the length of the flow guide element 2 in the sub-region B1 far from the central region a.

According to the fact that the air quantity of the middle area of the volute tongue surface 1 is the largest, the air quantity of the most lateral part of the volute tongue surface 1 is the second largest along the second direction Y, the air quantity between the middle area and the most lateral part is the smallest, the lateral area B is divided into at least two sub-areas B1, at least one flow guide part 2 is arranged in each sub-area B1, the length of the flow guide part 2 in the sub-area B1 close to the middle area A is smaller than that of the flow guide part 2 in the sub-area B1 far away from the middle area A, air flow on the volute tongue surface 1 can be effectively guided, extra noise is avoided, the air flow passing through the volute tongue surface 1 is cut, large eddy is prevented, falling eddy noise generated due to contact of the air flow and the volute tongue surface 1 can be effectively reduced, and further aerodynamic noise of a fan is reduced.

In some embodiments, the lengths of the flow guides 2 located in the same partition B1 are the same.

Referring to fig. 3, the side area B is divided into six partitions B1, a first partition B11, a second partition B12, a third partition B13, a fourth partition B14, a fifth partition B15, and a sixth partition B16. Optionally, three flow guides 3 are provided in each partition B1. The lengths of the flow guides 2 in the first section B11 are the same. The lengths of the flow guides 2 located in the second section B12 are the same. The lengths of the flow guides 2 in the third subsection B13 are identical. The lengths of the flow guides 2 located in the fourth section B14 are the same. The lengths of the flow guides 2 in the fifth partial area B15 are identical. The lengths of the flow guides 2 located in the sixth subsection B16 are identical.

In some embodiments, the side regions B on a first side of the central region a are symmetrically disposed with respect to the side regions B on a second side of the central region a, the first and second sides being opposite sides of the central region a.

The direction from the first side to the second side of the middle region a is parallel to the second direction Y.

In some embodiments, the baffle 2 is raised away from the volute tongue surface 1, and the height of the protrusion of the baffle 2 in the section B1 near the central region a is less than the height of the protrusion of the baffle 2 in the section B1 away from the central region a.

The length of the flow guide elements 2 in each section B1 increases in the second direction Y.

In some embodiments, the lengths of the flow guides 2 located in the central area a are the same. Optionally, six flow guides 3 are provided in the middle area a.

In some embodiments, the flow guide 2 protrudes away from the volute tongue surface 1, and the protruding height of the flow guide 2 in the middle region a is less than the protruding height of the flow guide 2 in the side regions B.

The height of the protrusions of the baffle 2 in each partition B1 increases in the second direction Y.

The flow guides 2 in the same partition B1 are of the same design and size. The flow guides 2 in the central area a are of identical construction and size.

Referring to fig. 4 and 6, in some embodiments, flow guide 2 is convex away from volute surface 1, the profile of the outer edge of flow guide 2 is a curve, and in the direction of airflow across volute surface 1, flow guide 2 includes a leading edge segment 201 upstream, a trailing edge segment 202 downstream, and an intermediate segment 203 connecting leading edge segment 201 and trailing edge segment 202.

The upstream leading edge section 201 of the flow guide 2 serves to reduce turbulent inflow noise.

The downstream trailing edge section 202 of the flow guide 2 serves to reduce shed vortex noise.

In some embodiments, the leading edge section 201 has a convex height that gradually increases from zero and the trailing edge section 202 has a convex height that gradually decreases from greater than zero to zero in the direction of airflow over the volute tongue surface 1.

In some embodiments, the location of the maximum protrusion height of the baffle 2 is located at the middle section 203.

In some embodiments, the location of the maximum raised height of the flow guide 2 in the central region a is near the trailing edge section 202 and the location of the maximum raised height of the flow guide 2 in the side regions B is near the leading edge section 201.

Referring to fig. 4 and 5, in some embodiments, the profile control equation for the leading edge segment 201 is:

wherein A is the ratio of the maximum protrusion height H of the flow guide piece 2 to the length L of the volute tongue surface 1, the value range of A is 0.03-0.15, C is the length L of the volute tongue surface 1, lambda is the ratio of the distance S between two identical flow guide pieces 2 in the same area to the length L of the volute tongue surface 1, and the value range of lambda is 0.02-0.12; the length L of the volute tongue surface 1 is the dimension in the direction of flow of the airflow flowing over the volute tongue surface 1, i.e. the dimension in the first direction X.

In some embodiments, the ratio of the length of the trailing edge section 202 to the length L i of the flow guide 2 ranges from 0.16 to 0.2. The width of the flow guide 2 is W.

In some embodiments, the length of the flow guide 2 farthest from the middle area a is equal to the length L of the volute tongue surface 1, and the length extension direction of the flow guide 2, the length L direction of the volute tongue surface 1 and the flow direction of the airflow flowing through the volute tongue surface 1 are parallel to each other.

In some embodiments, the flow guide 2 is configured to be obtained by cutting the airfoil along the chord direction of the airfoil. The airfoil may be an airfoil similar to the shape of the wings of long-eared owl.

The airfoil streamline flow guide piece 2 on the volute tongue surface 1 can further guide airflow and reduce shedding vortexes generated by the airflow.

The method for designing the volute tongue in some embodiments is described in detail below with reference to fig. 1 to 7.

Since the flying environment of long owls is similar to the working conditions of the fan and the long owls have a silent flying character, the guide 2 of the volute tongue 200 is designed in such a way that the cross-sectional profile of the long owl wings, the non-smooth front edges of the wings and the tail edges of the saw teeth are coupled according to the structural characteristics of the long owl wings, which enables an effective and feasible noise reduction.

Referring to fig. 3, in some embodiments, the volute tongue surface 1 is divided into thirteen regions in the second direction Y, a middle region a in the middle, and side regions B on both sides of the middle region a, each side region B is further divided into six zones B1, namely a first zone B11, a second zone B12, a third zone B13, a fourth zone B14, a fifth zone B15 and a sixth zone B16, respectively, according to the flow distribution of the fan outlet cross-section and according to the flow characteristics and structural characteristics of different cross-sections of the wings of long owl flying.

The six subareas B1 on the two sides and the middle area A are internally provided with flow guide pieces 2, for example, the six subareas B1 on the two sides of the middle area A are internally provided with three flow guide pieces 2, and the middle area A is provided with six flow guide pieces 2. Each flow guide 2 is made up of three structural couplings, a leading edge section 201, a middle section 203 and a trailing edge section 202. Wherein the front edge section 201 is controlled by a front edge profile equation, the middle section 203 extracts a pressure side profile of a owl wing section from a long-earowl wing section airfoil profile, the profile is reversely reconstructed to obtain a three-dimensional model of the long-earowl wing, the profile of the model section is extracted, and the profile is obtained after the profile is subjected to light homogenization, and the ratio of the length of the tail edge section 202 to the length of the guide member 2 is 0.16-0.2, preferably 0.18. The larger the ratio of the length of the trailing edge section 202 to the length of the flow guide 2 is, the narrower the trailing edge section 202 is, the sharper the formed saw teeth are, and the better the noise reduction effect is.

The parameters of the three structures of the flow guide 2 vary according to the area. And according to the structural characteristics of the long-eared owl wings, the shape of the snail tongue surface 1 is combined, according to the structural characteristics of the long-eared owl wings with different sections, on the basis of the structures of three areas of the wing front edge, the wing section and the tail edge, three structures of the non-smooth front edge and the sawtooth tail edge are designed for coupling design, so as to obtain the flow guide piece 2, and different flow guide pieces 2 are applied to each area of the snail tongue surface 1 (the middle area A and six subareas B1 at two sides).

Referring to fig. 7, the diversion member 2 in the middle area a and the six subareas B1 is an airfoil-shaped section of the wings of long-eared owl with a spanwise (root-to-tip direction) distance of 10% to 70% from the root of the wing (root-to-tip distance), and the length of the diversion member 2 is designed according to the characteristics of different sections of the wings of the long-eared owl. The middle guide in the middle area a uses an airfoil section 30 at 70% of the spanwise length from the root, the first guide in the first zone B11 uses an airfoil section 31 at 60% of the spanwise length from the root; the second flow guide located in the second zone B12 uses an airfoil section 32 at 50% of the spanwise length from the root, the third flow guide located in the third zone B13 uses an airfoil section 33 at 40% of the spanwise length from the root; the fourth guide located in the fourth sector B14 uses an airfoil section 34 located 30% of the spanwise length from the root; the fifth guide located in the fifth sector B15 uses an aerofoil section 35 with a 20% spanwise length from the root; the sixth flow guide in the sixth zone B16 uses an airfoil section 36 that is 10% span-wise from the root.

The long owl wing profiles of different cross-section are used in different areas, which results in the tail edges not being level. The short flow guide part 2 in the middle area a is due to the fact that the airfoil shaped section 30 with 70% span-wise length is adopted, and the high span-wise ratio has a better noise reduction effect according to the characteristics of different sections of the long owl wings, so that the airfoil shaped section 30 with 70% span-wise length is placed at the position with the largest air volume, and the rest positions are sequentially arranged by adopting different sections. The lower half part of each airfoil section is a suction surface, and the upper half part is a pressure surface.

According to the measurement of the parameters of the long-eared owl wings by the laser scanner and the extraction of the non-smooth structure of the front edge, the ratio A = 0.03-0.15 of the height of the structure hump to the chord length, the ratio lambda = 0.02-0.12 of the interval of the hump to the chord length, and the control equation of the profile of the front edge

Wherein C is equal to the total length of the wings of the long-eared owl.

The flow guide piece 2 adopts airfoil profile pressure surface molded lines, pressure side molded lines with different airfoil section are selected according to different distribution positions of the bionic volute tongue units, and the specific type selection can refer to table 1.

TABLE 1 bionic modiolus unit parameter table

Some embodiments also provide a housing assembly comprising a volute 100 and the above-described volute tongue 200, the volute tongue 200 being provided at an outlet of the volute 100.

Referring to fig. 1, some embodiments further provide a fan 400, which includes a fan blade 300 and the housing assembly described above, wherein the fan blade 300 is disposed in the volute 100 of the housing assembly.

The bionic volute tongue structure is designed by combining a biological structure with a fan, and can effectively guide airflow at the volute tongue and reduce backflow and vortex at the volute tongue; and the bionic volute tongue structure can effectively cut airflow, so that the generation of large eddy is reduced, and further, the pneumatic noise of the fan is reduced on the premise of ensuring the air quantity.

The fan 400 includes a dual inlet centrifugal fan or a single inlet centrifugal fan. The air inlet of the single-inlet centrifugal fan is only one on the left side or the right side.

Some embodiments also provide an air conditioner including a heat exchange member and the fan 400 described above.

Based on the embodiments of the disclosure described above, the technical features of one embodiment can be combined with one or more other embodiments beneficially without explicit negation or conflict.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (20)

1. A volute tongue, comprising:

a volute tongue surface (1) configured to be flowed through by an air flow, the volute tongue surface (1) comprising a central region (A), and side regions (B) located on both sides of the central region (A); and

the flow guide piece (2) is arranged on the volute tongue surface (1), the middle area (A) and the side area (B) are respectively provided with at least one flow guide piece (2), and the length of the flow guide piece (2) positioned in the middle area (A) is smaller than that of the flow guide piece (2) positioned in the side area (B).

2. The volute tongue according to claim 1, wherein the length of the flow guide (2) extends in a direction parallel to the direction of the airflow over the volute tongue surface (1).

3. The volute tongue according to claim 1, wherein the upstream end of the flow guide (2) in the middle region (a) is flush with the upstream end of the flow guide (2) in the side region (B) in the direction of the flow of air over the volute tongue surface (1).

4. The volute tongue according to claim 1, wherein the lateral region (B) is subdivided into at least two sub-regions (B1) in the direction from the central region (A) to the lateral region (B), wherein at least one flow guide element (2) is provided in each sub-region (B1) of the at least two sub-regions (B1), wherein the length of the flow guide element (2) in the sub-region (B1) adjacent to the central region (A) is smaller than the length of the flow guide element (2) in the sub-region (B1) remote from the central region (A).

5. Volute tongue according to claim 4, characterized in that the length of the flow-guiding elements (2) in the same sub-area (B1) is the same.

6. Volute tongue according to claim 4, characterized in that the flow guide (2) protrudes away from the volute tongue surface (1), the maximum protrusion height of the flow guide (2) in the section (B1) close to the central area (A) being smaller than the maximum protrusion height of the flow guide (2) in the section (B1) remote from the central area (A).

7. Volute tongue according to claim 1, characterized in that the length of the flow guide (2) in the middle area (A) is the same.

8. The volute of claim 1, wherein the side regions (B) on a first side of the central region (a) are symmetrically disposed with respect to the side regions (B) on a second side of the central region (a), the first and second sides being opposite sides of the central region (a).

9. The volute tongue according to claim 1, wherein the flow guide (2) protrudes away from the volute tongue surface (1), and wherein the maximum protrusion height of the flow guide (2) in the central region (a) is smaller than the maximum protrusion height of the flow guide (2) in the lateral regions (B).

10. The volute tongue according to any of claims 1-9, wherein the flow guide (2) is convex away from the volute tongue surface (1), the profile of the outer edge of the flow guide (2) is curved, and the flow guide (2) comprises an upstream leading edge section (201), a downstream trailing edge section (202), and an intermediate section (203) connecting the leading edge section (201) and the trailing edge section (202) in the direction of the airflow over the volute tongue surface (1).

11. The volute tongue according to claim 10, wherein the leading edge section (201) has a convex height that increases gradually from zero and the trailing edge section (202) has a convex height that decreases gradually from greater than zero to zero in the direction of airflow over the volute tongue surface (1).

12. The volute tongue according to claim 10, wherein the point of maximum raised height of the flow guide (2) is located in the middle section (203).

13. The volute tongue according to claim 12, wherein the point of maximum raised height of the flow guide (2) in the central region (a) is located close to the trailing edge section (202) and the point of maximum raised height of the flow guide (2) in the lateral regions (B) is located close to the leading edge section (201).

14. The volute tongue of claim 10, wherein the profile control equation for the leading edge segment (201) is:

wherein A is the ratio of the maximum protrusion height (H) of the flow guide piece (2) to the length (L) of the volute tongue surface (1), the value range of A is 0.03-0.15, C is the length (L) of the volute tongue surface (1), lambda is the ratio of the distance (S) between two identical flow guide pieces (2) in the same area to the length (L) of the volute tongue surface (1), and the value range of lambda is 0.02-0.12; the length (L) of the volute tongue surface (1) is the dimension along the flow direction of the airflow flowing through the volute tongue surface (1).

15. The volute tongue as claimed in claim 14, wherein a ratio of the length of the trailing edge section (202) to the length (Li) of the flow guide (2) is in the range of 0.16 to 0.2.

16. Volute tongue according to any of claims 1-9, characterized in that the length of the flow guide (2) furthest away from the middle area (A) is equal to the length (L) of the volute tongue surface (1), and that the length extension of the flow guide (2), the length (L) of the volute tongue surface (1) and the direction of the flow of the gas flowing over the volute tongue surface (1) are parallel to each other.

17. The volute tongue as claimed in any of claims 1 to 9, wherein the flow guide (2) is configured to be obtained by cutting the airfoil in a chord direction of the airfoil.

18. A housing assembly, comprising a volute (100) and a volute tongue according to any of claims 1 to 17, the volute tongue being provided at an outlet of the volute (100).

19. A fan comprising a fan blade (300) and the housing assembly of claim 18, the fan blade (300) being disposed within the volute (100) of the housing assembly.

20. An air conditioner comprising a heat exchange member and a fan as claimed in claim 19.

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