Volute, fan and air conditioner

Abstract

The invention relates to the technical field of draught fans, and provides a volute, a draught fan and an air conditioner, the volute comprises a shell, air inlets are formed in the two sides of the shell, and an air outlet is formed in the end of the shell; the air outlet is provided with first air outlet areas and second air outlet areas, the first air outlet areas are located in the middle of the air outlet and close to the two sides of the air inlet correspondingly, the second air outlet areas are located between the adjacent first air outlet areas, and the two side wall faces, in the length direction, of the second air outlet areas are concaved inwards in the width direction correspondingly. A concave surface structure which is relatively concave is constructed; the air speed of the first air outlet area is larger than that of the second air outlet area. The purposes of reducing noise, improving the air outlet amount, increasing the air supply distance and the like can be achieved, so that the overall air supply performance of the volute is effectively improved, and the use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to a volute, a fan and an air conditioner. Background Art

[0002] In related technologies, the air outlet of the volute of an existing centrifugal fan is generally a square air outlet. When the air flow in the volute flows out through the volute tongue, it will impact the volute tongue, generate eddy currents, and thus generate noise. Moreover, the air volume of the existing volute is small and the air supply distance is short, resulting in poor overall air supply performance of the volute and affecting the user experience. Summary of the Invention

[0003] The present invention provides a volute, a fan and an air conditioner to solve the defects such as large noise, small air volume and short air supply distance in related technologies, and can achieve the purposes of noise reduction, increased air volume and increased air supply distance, thereby effectively improving the overall air supply performance of the volute and enhancing the user experience.

[0004] The present invention provides a volute, comprising:

[0005] A housing, with air inlets provided on both sides of the housing and an air outlet provided at the end of the housing;

[0006] The air outlet has a first air outlet area and a second air outlet area. The first air outlet area is respectively located in the middle of the air outlet and on both sides close to the air inlet. The second air outlet area is located between adjacent first air outlet areas, and the two side walls of the second air outlet area along the length direction are respectively recessed inward along the width direction, constructing a relatively recessed concave structure;

[0007] Wherein, the wind speed in the first air outlet area is greater than the wind speed in the second air outlet area.

[0008] For the volute provided by the present invention, air enters through the air inlets on both sides of the housing and exits through the air outlet at the end of the housing. Moreover, two relatively recessed concave structures are respectively arranged on the upper and lower side walls of the air outlet, so that the entire air outlet forms a first air outlet area and a second air outlet area with different wind speeds. The wind speed in the first air outlet area on both sides and in the middle of the volute air outlet will be faster, and the wind speed in the second air outlet area between adjacent first air outlet areas is smaller. Therefore, by setting the concave structure, the present invention can distribute air outlet areas with different wind speeds, make the wind speed distribution at the volute air outlet reasonable, increase the wind speed in the middle and on both sides of the air outlet, enable the air outlet air flow to pass through quickly, reduce the generation of eddy currents, and thus achieve the purposes of noise reduction, increased air volume and increased air supply distance, effectively improving the overall air supply performance of the volute and enhancing the user experience. The volute of the present invention is particularly suitable for application environments with greater resistance or more complexity.

[0009] A volute according to the present invention, wherein the concave structure is a guiding arc surface.

[0010] By designing the concave structure as a rounded guiding arc surface, the present invention can guide the outgoing air flow. Combined with the outgoing air regions at different wind speeds, the wind speed distribution at the volute air outlet can be made more reasonable, achieving the purpose of a longer air supply distance and a greater air outlet capacity.

[0011] A volute according to the present invention, wherein the ratio of the length of the concave structure to the length of the air outlet is between 0.5 and 0.6.

[0012] By setting the ratio of the length of the concave structure to the length of the air outlet to be between 0.5 and 0.6, which approximately conforms to the golden ratio, such a setting can make the flow direction of the air flow at the air outlet more concentrated, so that the wind speed in the first air outlet regions on both sides and the middle part of the air outlet is faster, and thus a greater air volume and a longer air supply distance can be obtained, achieving the purpose of high air volume and high capacity, and being applicable to application environments with greater resistance or more complexity.

[0013] A volute according to the present invention, wherein the ratio of the depression depth of the concave structure to the width of the air outlet is between 4% and 10%.

[0014] By setting the ratio of the depression depth of the concave structure to the width of the air outlet to be between 4% and 10%, on the one hand, the size of the air outlet can be ensured, thus avoiding affecting the air volume, and on the other hand, the depression offset angle of the concave structure can be prevented from being too small, thus ensuring the air supply performance.

[0015] A volute according to the present invention further includes:

[0016] A volute tongue disposed between the air cavity inside the housing and the air outlet;

[0017] A flow disturbance structure disposed on the inner wall of the volute tongue for reducing noise.

[0018] By arranging the flow disturbance structure on the inner wall of the volute tongue and combining with the concave structure at the air outlet, the present invention can further effectively reduce the outgoing air noise, thereby improving the user experience.

[0019] A volute according to the present invention, wherein the inner wall of the volute tongue is recessed inward to form the groove-shaped flow disturbance structure, and the cross-section of the flow disturbance structure gradually shrinks in the direction from the air cavity to the air outlet;

[0020] In the width direction of the air outlet, a plurality of the flow disturbance structures are arranged side by side.

[0021] The present invention designs a plurality of groove-shaped spoiler structures with gradually shrinking cross-sections by integrally forming the volute tongue. Without changing the original volute tongue size, it can effectively ensure the strength of the volute. At the same time, the distance between the outer edge of the impeller and the volute tongue is increased, achieving the purpose of reducing high-frequency abnormal noises. It can also effectively suppress the separation of the incoming air flow to generate large-scale vortices, improve the air flow state, reduce flow separation, lower the vortex intensity, and further reduce the interaction between the vortex and the wall of the air chamber, achieving the purpose of noise reduction, effectively improving the operating quality of the volute, and enhancing the user experience.

[0022] According to a volute provided by the present invention, a first end of the spoiler structure close to the air chamber is collinear with an inner end of the volute tongue close to the air chamber, and at least a part of a second end of the spoiler structure close to the air outlet is non-collinear.

[0023] With such a design, a stepped wavy structure can be formed by the spoiler structure. The stepped spoiler structure design can also effectively reduce high-frequency noise and produce a spoiler effect. When the air flow passes through this stepped spoiler structure and impacts on different peak surfaces, different sound spectra will be formed, reducing the high-frequency abnormal noises formed by the aggregation of sounds with the same frequency, thereby effectively improving the air outlet performance of the volute.

[0024] According to a volute provided by the present invention, the spoiler structure is a conical groove.

[0025] According to a volute provided by the present invention, the ratio of the total length of the first ends of a plurality of the spoiler structures close to the air chamber to the length of the volute tongue is between 1 / 4 and 3 / 4.

[0026] The present invention can effectively ensure the noise reduction effect of the spoiler structure by setting the total length of the first ends of a plurality of the spoiler structures to at least half of the length of the volute tongue.

[0027] According to a volute provided by the present invention, the angle of the second end of the spoiler structure close to the air outlet and the impeller outlet angle in the air chamber satisfy the expression:

[0028] sinα = cot(γ / 2 - 1);

[0029] Wherein, α is the angle of the second end of the spoiler structure, and γ is the impeller outlet angle in the air chamber.

[0030] With such a design, the spoiler structure can better adapt to impellers with different angles, so that when the air flow passes through the spoiler structure, the momentum loss caused by air flow dispersion or wall impact will not occur, resulting in the loss of air volume, thereby effectively improving the air volume and increasing the air supply distance.

[0031] According to a volute provided by the present invention, both ends of the projection of the concave structure on the cross-section of the air outlet are respectively tangent to the spoiler structure.

[0032] Through the synergistic effect of the concave structure at the air outlet and the flow disturbance structure of the volute tongue, the present invention can effectively reduce noise, increase the air volume, and extend the air supply distance, thereby effectively improving the overall air supply performance of the volute and enhancing the user experience.

[0033] According to a volute provided by the present invention, the distance between the inner end of the concave structure extending from the air outlet to the air cavity and the second end of the flow disturbance structure close to the air outlet is between 9 and 11 millimeters.

[0034] By setting the distance between the inner end of the concave structure and the second end of the flow disturbance structure to be between 9 and 11 millimeters, on the one hand, the air outlet effect can be ensured, and on the other hand, only a small-sized inner concave structure modification of the volute can be made to ensure the strength of the volute and avoid deformation problems.

[0035] According to a volute provided by the present invention, it further includes:

[0036] An air collector, which is arranged at the air inlet.

[0037] The present invention also provides a fan, which includes: the above-mentioned volute.

[0038] The present invention also provides an air conditioner, which includes: the above-mentioned fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 is one of the structural schematic diagrams of the volute provided by the present invention;

[0041] Figure 2 is another structural schematic diagram of the volute provided by the present invention;

[0042] Figure 3 is one of the structural schematic diagrams of the volute with part of the housing removed provided by the present invention;

[0043] Figure 4 is another structural schematic diagram of the volute with part of the housing removed provided by the present invention;

[0044] Figure 5 is a third structural schematic diagram of the volute with part of the housing removed provided by the present invention;

[0045] Figure 6It is a comparison chart of the air volume and noise test results between the volute of the present invention and a conventional volute;

[0046] Figure 7 It is a comparison chart of the noise spectra between the volute of the present invention and a conventional volute.

[0047] Reference numerals:

[0048] 1: Housing; 2: Air inlet; 3: Air outlet; 4: Concave structure;

[0049] 5: Volute tongue; 6: Turbulence structure; 7: Collector. Detailed implementation manners

[0050] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0051] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0052] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0053] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0054] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "an example", "a specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0055] According to an embodiment of the first aspect of the present invention, with reference to Figure 1 and Figure 2 as shown, the volute provided by the present invention mainly includes: a housing 1, air inlets 2 are respectively arranged on the left and right sides of the housing 1, and an air outlet 3 is arranged at the front end of the housing 1; the air outlet 3 has a first air outlet area I and a second air outlet area II. The first air outlet area I is respectively located in the middle of the air outlet 3 and on the left and right sides close to the air inlets 2. The second air outlet area II is located between adjacent first air outlet areas I, and the upper and lower side walls of the second air outlet area II along the length direction are respectively recessed inward in the width direction, constructing a relatively recessed concave surface structure 4; wherein, the first air outlet area I and the second air outlet area II are roughly divided by the dotted line in Figure 2 and the wind speed in the first air outlet area I is greater than that in the second air outlet area II.

[0056] The volute provided by the embodiment of the present invention has a double-headed impeller fan disposed in the air cavity of the housing 1. Air enters through the air inlets 2 on both sides of the housing 1 and exits through the air outlet 3 at the end of the housing 1. Moreover, two relatively recessed concave structures 4 are respectively disposed on the upper and lower side walls of the air outlet 3, for a total of four concave structures 4, which can cause the entire air outlet 3 to form a first air outlet area Ⅰ and a second air outlet area Ⅱ with different wind speeds. The wind speed in the first air outlet area Ⅰ on both sides and in the middle position of the volute air outlet 3 will be relatively fast, and the wind speed in the second air outlet area Ⅱ between adjacent first air outlet areas Ⅰ is relatively small. Therefore, by providing the concave structures 4, the present invention can distribute air outlet areas with different wind speeds, make the wind speed distribution at the volute air outlet 3 reasonable, increase the wind speed in the middle and on both sides of the air outlet 3, enable the air outlet airflow to pass quickly, reduce the generation of eddy currents, thereby achieving the purposes of noise reduction, increasing the air output, and increasing the air supply distance, effectively improving the overall air supply performance of the volute and enhancing the user experience. The volute of the present invention is particularly suitable for application environments with greater resistance or more complexity.

[0057] According to an embodiment of the present invention, the concave structure 4 of the present invention is a guiding arc surface.

[0058] By designing the concave structure 4 as a rounded guiding arc surface in the embodiment of the present invention, the air outlet airflow can be guided. Combined with the air outlet areas with different wind speeds, the wind speed distribution at the volute air outlet 3 can be made more reasonable, achieving the purposes of a farther air supply distance and a greater air outlet capacity.

[0059] According to an embodiment of the present invention, the ratio of the length L1 of the concave structure 4 to the length of the air outlet 3 is between 0.5 and 0.6.

[0060] By setting the ratio of the length of the concave structure 4 to the length of the air outlet 3 to be between 0.5 and 0.6 in the embodiment of the present invention, which approximately conforms to the golden ratio, such a setting can make the airflow direction at the air outlet 3 more concentrated, so that the wind speed in the first air outlet area Ⅰ on both sides and in the middle part of the air outlet 3 is faster, and thus a greater air volume and a farther air supply distance can be obtained, achieving the purposes of high air volume and high capacity, and being suitable for application environments with greater resistance or more complexity.

[0061] According to an embodiment of the present invention, the ratio of the recessed depth H of the concave structure 4 to the width of the air outlet 3 is between 4% and 10%.

[0062] Since it is considered that if the inward recessed depth of the concave structure 4 is too large, it may cause the air outlet 4 to become smaller and affect the air volume, and if it is too small, it may cause the recessed offset angle β of the concave structure 4 to be too small, resulting in an unexpected air outlet effect.

[0063] Therefore, in the embodiment of the present invention, by setting the ratio of the depression depth of the concave structure 4 to the width of the air outlet 3 to be between 4% and 10%, on the one hand, the size of the air outlet 3 can be ensured, thereby avoiding affecting the air volume, and on the other hand, the depression offset angle of the concave structure 4 can be avoided from being too small, thereby ensuring the air supply performance.

[0064] According to an embodiment of the present invention, referring to Figure 2 As shown, the concave structures 4 of the two second air outlet regions II are symmetrically distributed about the central axis of the air outlet 3 in the width direction.

[0065] With such a design, the wind speed distribution at the volute air outlet 3 can be made more uniform, thereby reducing the generation of eddy currents, which is beneficial to reducing noise, increasing the air volume, and increasing the air supply distance, thus effectively improving the overall air supply performance of the volute and enhancing the user experience.

[0066] According to an embodiment of the present invention, referring to Figures 1-5 As shown, the volute of the present invention further includes: a volute tongue 5 and a flow disturbance structure 6. The volute tongue 5 is arranged between the air cavity inside the housing 1 and the air outlet 3; the flow disturbance structure 6 is arranged on the inner wall of the volute tongue 5 for reducing noise.

[0067] In the embodiment of the present invention, by arranging the flow disturbance structure 6 on the inner wall of the volute tongue 5 and combining with the concave structure 4 at the air outlet 3, the air outlet noise can be further effectively reduced, thereby enhancing the user experience.

[0068] According to an embodiment of the present invention, referring to Figure 3 and Figure 4 As shown, the inner wall of the volute tongue 5 is recessed inward to form a groove-shaped flow disturbance structure 6, and the cross-section of the flow disturbance structure 6 gradually shrinks in the direction from the air cavity inside the housing 1 to the air outlet 3; along the width direction of the air outlet 3, a plurality of flow disturbance structures 6 are arranged side by side. For example, eleven can be arranged, and of course, other numbers can also be set, which can be adjusted and designed according to actual needs.

[0069] In the embodiment of the present invention, by integrally forming a plurality of groove-shaped flow disturbance structures 6 with gradually shrinking cross-sections on the volute tongue 5, without changing the original size of the volute tongue 5, the strength of the volute can be effectively ensured, and at the same time, the distance between the outer edge of the impeller and the volute tongue 5 can be increased, achieving the purpose of reducing high-frequency abnormal noises. It can also effectively suppress the separation of the incoming air flow to generate large-scale eddy currents, improve the air flow state, reduce the flow separation, and reduce the vortex intensity, thereby reducing the interaction between the vortex and the wall surface of the air cavity, achieving the purpose of noise reduction, effectively improving the operating quality of the volute, and enhancing the user experience.

[0070] According to an embodiment of the present invention, referring to Figure 3 and Figure 4As shown, the first ends of multiple spoiler structures 6 close to the first end of the internal air cavity of the housing 1 are collinear with the inner end of the volute tongue 5 close to the air cavity, that is, the starting position of the bottom of the spoiler structure 6 is the starting position of the arc angle of the volute tongue 5, and the tops of the second ends of the multiple spoiler structures 6 close to the air outlet 3 are at least partially non - collinear. Preferably, the tops of the second ends of the multiple spoiler structures 6 are all non - collinear and are arranged with staggered peaks.

[0071] With such a design, the spoiler structure 6 can form a wavy structure with staggered peaks. The design of the spoiler structure 6 with staggered peaks can also effectively reduce high - frequency noise and produce a spoiler effect. When the air flow passes through this spoiler structure 6 with staggered peaks, it impacts on different peak surfaces, forming different sound spectra, reducing the high - frequency abnormal sounds formed by the convergence of sounds with the same frequency, thereby effectively improving the air - outlet performance of the volute.

[0072] According to an embodiment of the present invention, the spoiler structure 6 is a conical groove.

[0073] According to a volute provided by the present invention, referring to Figure 3 and Figure 4 As shown, the ratio of the total length L2 of the first ends of the multiple spoiler structures 6 close to the internal air cavity of the housing 1 to the length L3 of the volute tongue 5 is between 1 / 4 and 3 / 4. Among them, the length L2 of the first ends of the spoiler structures 6 close to the internal air cavity of the housing 1 should not exceed 20 mm.

[0074] In the embodiment of the present invention, by setting the total length of the first ends of the multiple spoiler structures 6 to at least half of the length of the volute tongue 5, the noise reduction effect of the spoiler structure 6 can be effectively ensured.

[0075] According to an embodiment of the present invention, the angle of the second end of the spoiler structure 6 close to the air outlet 3 and the impeller outlet angle in the air cavity of the housing 1 satisfy the expression:

[0076] sinα = cot(γ / 2 - 1);

[0077] where α is the angle of the second end of the spoiler structure 6, that is, the cone angle; γ is the impeller outlet angle in the air cavity.

[0078] With such a design, the spoiler structure 6 can better adapt to impellers with different angles, so that when the air flow passes through the spoiler structure 6, the loss of momentum caused by air flow dispersion or wall impact will not occur, resulting in the loss of air volume, thereby effectively increasing the air volume and the air - supply distance.

[0079] According to an embodiment of the present invention, the ratio of the clearance between the volute tongue 5 and the outer edge of the impeller in the air cavity of the housing 1 to the outer diameter of the impeller is between 0.05 and 0.15.

[0080] The function of the volute tongue 5 is to prevent some gas from circulating in the volute. Therefore, it is necessary to ensure the clearance between the volute tongue 5 and the outer edge of the impeller. The selection of the clearance value should not only consider the aerodynamic performance of the fan, but also be determined according to the noise requirements. If the clearance is too small, it is beneficial to improve the efficiency and pressure of the fan, but the noise increases. If the clearance is too large, the efficiency and capacity of the fan will decrease, but the noise will decrease and the high-frequency abnormal sound will be eliminated.

[0081] In the embodiment of the present invention, by setting the ratio of the clearance between the volute tongue 5 and the outer edge of the impeller to the outer diameter of the impeller to be between 0.05 and 0.15, it is beneficial to reduce noise and at the same time improve the air supply efficiency and capacity of the fan.

[0082] According to an embodiment of the present invention, referring to Figure 5 As shown, the ratio of the arc angle r of the volute tongue 5 to the outer diameter of the impeller in the air chamber is between 0.03 and 0.06.

[0083] It can be understood that the height of the conical spoiler structure 6 can be determined according to the arc angle at the top of the volute tongue 5. The longer the arc length of the volute tongue 5, the higher the height of the conical spoiler structure 6. And the starting position at the bottom of the first end of the spoiler structure 6 is the starting position of the arc angle of the volute tongue 5. The termination position of the second end of the spoiler structure 6 can be determined according to the top angle of the conical spoiler structure 6.

[0084] According to an embodiment of the present invention, referring to Figure 4 As shown, the two ends of the projection of the concave structure 4 on the cross-section of the air outlet 3 are respectively tangent to the spoiler structure 6. The left end of the concave structure 4 is flush with the right side of the left spoiler structure 6, and the right end of the concave structure 4 is flush with the left side of the right spoiler structure 6, as shown by the dotted line in the figure.

[0085] Moreover, the distance d between the inner end of the concave structure 4 extending from the air outlet 3 to the air chamber and the second end of the spoiler structure 6 close to the air outlet 3 is between 9 and 11 millimeters, for example, it can be 10 millimeters. Thus, the length and width of the concave structure 4 can be determined.

[0086] Through the synergistic effect of the concave structure 4 at the air outlet 3 and the spoiler structure of the volute tongue in the present invention, the noise can be effectively reduced, the air output can be increased, and the air supply distance can be increased, thereby effectively improving the overall air supply performance of the volute and enhancing the user experience.

[0087] And by setting the distance between the inner end of the concave structure 4 and the second end of the spoiler structure 6 to be between 9 and 11 millimeters, on the one hand, the air outlet effect can be ensured, and on the other hand, only a small-sized inner concave structure modification can be made to the volute to ensure the strength of the volute and avoid deformation problems.

[0088] According to an embodiment of the present invention, referring to Figure 1As shown in the figure, the volute of the present invention further includes: an air collector 7, which is arranged at the air inlet 2 to ensure that the air flow can evenly fill the impeller inlet section, reduce the flow loss, so that the air flow at the air inlet 2 can enter the impeller more smoothly and efficiently, and further improve the overall air supply effect of the volute.

[0089] In a specific example, referring to Figure 6 As shown in the figure, a represents the air volume and noise test results of a conventional volute, and b represents the air volume and noise test results of the volute of the present invention.

[0090] It can be seen by comparison that, compared with the conventional volute, the volute of the present invention has a higher air volume and lower noise.

[0091] Moreover, referring to Figure 7 As shown in the figure, the abscissa is the frequency (unit: Hz), the ordinate is the sound volume (unit: dB), m represents the noise spectrum test curve of the conventional volute, and n represents the noise spectrum test curve of the volute of the present invention.

[0092] It can be seen by comparison that, compared with the conventional volute, the volute of the present invention can effectively reduce high-frequency noise.

[0093] In summary, for the volute provided in the above embodiments of the present invention, by integrally designing the concave structure 4 arranged at the air outlet 3 and the flow disturbing structure 6 arranged on the inner wall of the volute tongue 5 in a coordinated manner, the air output can be effectively increased, the air supply distance can be increased, the noise can be reduced, especially the high-frequency noise can be reduced, so as to effectively improve the overall operation quality of the volute and improve the user experience.

[0094] According to the embodiments of the second aspect of the present invention, the present invention further provides a fan, which mainly includes: the volute of the above embodiments.

[0095] The fan provided by the embodiments of the present invention can achieve the purposes of noise reduction, increasing the air output and increasing the air supply distance through the volute of the above embodiments, so as to effectively improve the air supply performance of the fan and improve the user experience.

[0096] According to the embodiments of the third aspect of the present invention, the present invention further provides an air conditioner, which mainly includes: the fan of the above embodiments.

[0097] The air conditioner provided by the embodiments of the present invention can reduce noise and improve the indoor heat exchange effect through the fan of the above embodiments, thereby improving the user experience.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A volute, characterized in that, it includes: a housing, with air inlets provided on both sides of the housing, and an air outlet provided at the end of the housing; the air outlet has a first air outlet area and a second air outlet area. The first air outlet area is respectively located in the middle of the air outlet and on both sides close to the air inlets. The second air outlet area is located between adjacent first air outlet areas, and the two side walls of the second air outlet area along the length direction are respectively recessed inward along the width direction, constructing a relatively recessed concave structure; wherein, the wind speed in the first air outlet area is greater than the wind speed in the second air outlet area.

2. The volute according to claim 1, characterized in that, the concave structure is a guiding arc surface.

3. The volute according to claim 1, characterized in that, the ratio of the length of the concave structure to the length of the air outlet is between 0.5 and 0.

6.

4. The volute according to claim 1, characterized in that, the ratio of the depression depth of the concave structure to the width of the air outlet is between 4% and 10%.

5. The volute according to any one of claims 1 - 4, characterized in that, it further includes: a volute tongue, arranged between the air cavity inside the housing and the air outlet; a flow disturbance structure, arranged on the inner wall of the volute tongue for reducing noise.

6. The volute according to claim 5, characterized in that, the inner wall of the volute tongue is recessed inward, constructing the groove - type flow disturbance structure, and the cross - section of the flow disturbance structure tapers along the direction from the air cavity to the air outlet; along the width direction of the air outlet, multiple flow disturbance structures are arranged side by side.

7. The volute according to claim 6, characterized in that, the first end of the flow disturbance structure close to the air cavity is collinear with the inner end of the volute tongue close to the air cavity, and the second end of the flow disturbance structure close to the air outlet is at least partially non - collinear.

8. The volute according to claim 6, characterized in that, the flow disturbance structure is a conical groove.

9. The volute according to claim 8, characterized in that, the ratio of the total length of the first ends of multiple flow disturbance structures close to the air cavity to the length of the volute tongue is between 1 / 4 and 3 / 4.

10. The volute according to claim 8, characterized in that, the angle of the second end of the flow disturbance structure close to the air outlet and the impeller outlet angle in the air cavity satisfy the expression: sinα = cot(γ / 2 - 1); wherein, α is the angle of the second end of the flow disturbance structure, and γ is the impeller outlet angle in the air cavity.

11. The volute according to claim 6, characterized in that, the two ends of the projection of the concave structure on the cross - section of the air outlet are respectively tangent to the flow disturbance structure.

12. The volute according to claim 6, characterized in that, the distance between the inner end of the concave structure extending along the direction from the air outlet to the air cavity and the second end of the flow disturbance structure close to the air outlet is between 9 and 11 millimeters.

13. The volute according to any one of claims 1 - 4, characterized in that, it further includes: a collector, arranged at the air inlet.

14. A fan, characterized in that, Comprising: The volute according to any one of claims 1-13.

15. An air conditioner, characterized in that it comprises: The fan according to claim 14.

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