Volute assembly, fan and air conditioner

Abstract

The utility model provides a volute assembly, a fan and an air conditioner. The volute assembly comprises a volute; the diffusion section is arranged on the volute casing, and the diffusion section is communicated with the volute casing; the diffusion section comprises a lower wall, an upper wall and a diffusion side wall, wherein the lower wall and the upper wall are opposite, and the diffusion side wall is located between the lower wall and the upper wall. According to the volute assembly, the fan and the air conditioner, the shape of the diffusion side wall of the diffusion section is limited, and the shape of the diffusion side wall inclines outwards in the airflow direction and the direction from bottom to top, so that the diffusion side wall forms a curved surface shape which is gradually away from the center of the diffusion section; therefore, the distribution of the diffusion section and the diffusion degree can be reliably controlled to be matched with the speed distribution of air flow exhausted by the volute, the hidden danger that the air outlet speed of the volute is too large is solved, the outlet dynamic pressure of the volute assembly is effectively recycled, the static pressure carrying capacity and the air volume of a fan are improved, and air noise is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field, especially a volute assembly, fan and air conditioner. BACKGROUND

[0002] The centrifugal fan is generally composed of an impeller and a volute, wherein the volute serves to concentrate, guide and further transform part of kinetic energy of the gas leaving the impeller into static pressure. In the prior art, the design of the air outlet position of the volute generally includes an outlet diffuser section and a volute tongue, and the design of the two plays a key role in the performance level of the centrifugal fan, especially the static pressure capacity and noise. Therefore, how to reasonably design the structure of the outlet diffuser section and the volute tongue to match different application conditions has become a problem to be solved by the technical personnel in the field. SUMMARY

[0003] To solve the technical problem that the design of the diffuser section and the volute tongue on the volute affects the performance level of the fan in the prior art, a volute assembly, a fan and an air conditioner are provided, wherein the diffuser side wall is inclined outward in both the airflow direction and the direction from the lower wall to the upper wall to form a curved surface shape to improve the airflow state, the fan air volume, the static pressure capacity and the wind noise of the volute assembly.

[0004] A volute assembly comprises:

[0005] a volute;

[0006] a diffuser section arranged on the volute and in communication with the volute;

[0007] The diffuser section comprises opposite lower and upper walls and a diffuser side wall between the lower and upper walls, the diffuser side wall gradually inclines outward of the diffuser section in a direction away from the volute, and the diffuser side wall gradually inclines outward of the diffuser section in a direction from the lower wall to the upper wall.

[0008] The diffuser side wall is formed by scanning a curve AB in the direction from the lower wall to the upper wall, a scanning path of an end point A of the curve AB forms a first side of the diffuser side wall close to the volute, and a scanning path of an end point B of the curve AB forms a second side of the diffuser side wall away from the volute.

[0009] The curve AB is a circular arc line or a conic curve, and an opening of the curve AB faces outward of the diffuser section.

[0010] The volute comprises a volute side wall, the diffuser side wall is connected to the volute side wall, and the diffuser side wall and the volute side wall have a common edge A1A2.

[0011] The diffuser section is provided with a diffuser air outlet, a lower endpoint A1 of the common edge A1A2 projects to form a projection point C1 on a plane where the diffuser air outlet is located, and an upper endpoint A2 of the common edge A1A2 projects to form a projection point C2 on the plane where the diffuser air outlet is located, and the lower endpoint A1, the upper endpoint A2, the projection point C2 and the projection point C1 form a first plane;

[0012] In the direction from the lower wall to the upper wall, the diffuser angle θ formed between the tangent line of the diffuser side wall at the common edge A1A2 and the first plane gradually increases.

[0013] The diffuser angle θ satisfies the following functional relationship:

[0014] θ=θ1+θ2*sin(90*t);

[0015] Wherein, θ1 and θ2 are angle parameters; t is an independent variable, the value range of t is [0, 1], and when t=0, the diffuser angle θ is the included angle between the tangent line of the lower edge of the diffuser side wall and the first plane; when t=1, the diffuser angle θ is the included angle between the tangent line of the upper edge of the diffuser side wall and the first plane.

[0016] The value range of the angle parameter θ1 is 5°≤θ1≤10°; and / or, the value range of the angle parameter θ2 is 2°≤θ2≤8°.

[0017] The diffuser section includes a diffuser air outlet away from the volute, and the diffuser side wall has a first side edge A1A2 connected to the volute, and in the direction from the lower wall to the upper wall, the diffuser distance L between a point A on the first side edge A1A2 and the plane where the diffuser air outlet is located gradually increases.

[0018] The diffuser distance L satisfies the following functional relationship:

[0019] L=ε1a-(ε1a-ε2b)*cos(90*t);

[0020] Wherein, ε1 and ε2 are diffuser modulation coefficients; a is the characteristic length of the upper line of the diffuser section; b is the characteristic length of the lower line of the diffuser section; t is an independent variable, the value range of t is [0, 1], and when t=0, point A is the endpoint A1 of the first side edge; when t=1, point A is the endpoint A2 of the first side edge.

[0021] The value range of the diffuser modulation coefficient ε1 is 0.5≤ε1≤1; and / or, the value range of the diffuser modulation coefficient ε2 is 0.5≤ε2≤1.

[0022] The volute comprises a guide plate, the diffuser section comprises an upper wall, the upper wall is connected with the upper end of the guide plate, and the upper wall gradually inclines downward in the direction away from the guide plate.

[0023] The profile of the upper wall is a circular arc line.

[0024] The diffuser upper profile downward inclination angle α formed between the line connecting the two ends of the profile of the upper wall and the horizontal plane is in the range of 2°≤α≤10°.

[0025] The diffuser section further comprises a lower wall, the lower wall is connected with the lower end of the guide plate through a volute tongue, and the volute diffusion angle β formed between the line connecting the two ends of the profile of the upper wall and the line connecting the two ends of the profile of the lower wall is in the range of 15°≤β≤30°.

[0026] The volute assembly further comprises a volute tongue, the diffuser section is connected with the volute through the volute tongue, and the size of the volute tongue to the upper wall of the diffuser section gradually decreases from the middle part of the volute tongue to the two ends of the volute tongue.

[0027] The cross section of the volute tongue is a circular arc shape, and the radius r of the circular arc shape satisfies the following functional relationship:

[0028] r=s1δ+s2δ*sin(90*t);

[0029] Wherein, s1 and s2 are radius adjustment coefficients, δ is the minimum gap between the volute tongue and the impeller arranged in the volute assembly, t is an independent variable, the value range of t is [0, 1], and when t=0, it is the first end of the volute tongue; when t=1, it is the second end of the volute tongue.

[0030] The value range of the radius adjustment coefficient s1 is 0.4≤s1≤0.8, and / or the value range of the radius adjustment number s2 is 0.6≤s2≤1.2, and / or the value range of the minimum gap δ is 6mm≤δ≤12mm.

[0031] A fan comprising the volute assembly.

[0032] An air conditioner comprising the volute assembly or the fan.

[0033] The volute assembly, the fan and the air conditioner provided by the utility model, by limiting the shape of the diffuser side wall of the diffuser section, the shape of the diffuser side wall inclines outward in the airflow direction and the direction from bottom to top, so that the diffuser side wall forms a curved surface shape gradually away from the center of the diffuser section, thereby reliably controlling the distribution and diffusing degree of the diffuser section to match the speed distribution of the airflow discharged by the volute, solving the hidden danger of excessive air outlet speed of the volute, effectively recovering the outlet dynamic pressure of the volute assembly, improving the static pressure capacity and air volume of the fan, and reducing the wind noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a volute assembly provided in an embodiment of the present utility model;

[0035] Figure 2 Another structural schematic diagram of the volute assembly provided by an embodiment of the utility model;

[0036] Figure 3 A cross-sectional view of a volute assembly provided in an embodiment of the present utility model;

[0037] Figure 4 for Figure 3 A partial schematic diagram in ;

[0038] Figure 5 A schematic structural diagram of a diffuser section provided in an embodiment of the present utility model;

[0039] Figure 6 A schematic diagram of a scanning cross-sectional profile of a diffuser side wall provided in an embodiment of the present utility model;

[0040] Figure 7 A schematic diagram of the structure of the snail tongue provided in an embodiment of the present utility model;

[0041] In the picture:

[0042] 1. Volute; 2. Diffuser section; 21. Lower wall; 22. Upper wall; 23. Diffuser side wall; 11. Volute side wall; 24. Diffuser air outlet; 12. Guide plate; 3. Volute tongue. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first", "second", and the like in the description of the utility model and the claims and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, the process, method, system, product or equipment including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0046] It should be noted that in the description of the utility model, the terms "up", "down", "left", "right", "in", "out" and the like indicate the direction or position relationship of the terms based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0047] In addition, it should be noted that in the description of the utility model, unless otherwise specified and limited, the terms "mounting", "setting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0048] The centrifugal fan is generally composed of an impeller and a volute, wherein the volute plays a role in concentrating and guiding the gas leaving the impeller and further converting part of the kinetic energy into static pressure. In the prior art, the design of the volute outlet position generally includes an outlet diffuser section and a volute tongue, and the design of the two plays a key role in the performance level of the centrifugal fan, especially the static pressure capacity and noise. Therefore, how to reasonably design the structure of the outlet diffuser section and the volute tongue to match different application conditions has become a problem that technicians in the field need to solve.

[0049] Therefore, the present application provides a kind of as Figures 1 to 7The volute assembly shown, comprising: a volute 1; a diffuser section 2, which is arranged on the volute 1 and communicates with the volute 1; the diffuser section 2 comprises opposite lower wall 21 and upper wall 22 and diffuser side wall 23 between the lower wall 21 and the upper wall 22, in the direction away from the volute 1, the diffuser side wall 23 gradually tilts to the outside of the diffuser section 2, and in the direction from the lower wall 21 to the upper wall 22, the diffuser side wall 23 gradually tilts to the outside of the diffuser section 2. By limiting the shape of the diffuser side wall 23 of the diffuser section 2, the shape of the diffuser side wall 23 is inclined outward in the direction of the airflow and from bottom to top, so that the diffuser side wall 23 forms a curved surface shape gradually away from the center of the diffuser section 2, thereby reliably controlling the distribution and diffuser degree of the diffuser section 2 to match the velocity distribution of the airflow discharged by the volute 1, solving the problem of excessive outlet velocity of the volute 1, effectively recovering the outlet dynamic pressure of the volute assembly, improving the static pressure capacity and air volume of the fan, and reducing wind noise. Wherein, the end face of the diffuser section 2 away from the volute 1 is provided with a diffuser outlet 24, which constitutes the outlet of the volute assembly.

[0050] Specifically, the diffuser side wall 23 is formed by scanning the curve AB in the direction from the lower wall 21 to the upper wall 22, the scanning path of the endpoint A of the curve AB forms the first side of the diffuser side wall 23 close to the volute 1, and the scanning path of the endpoint B of the curve AB forms the second side of the diffuser side wall 23 away from the volute 1. Due to the approximate circular shape of the cross section of the volute 1, the size of the lower wall 21 of the diffuser section 2 is necessarily much smaller than the size of the upper wall 22 of the diffuser section 2, so that in the direction from the lower wall 21 to the upper wall 22, the distance between the endpoint A of the curve AB and the end face of the diffuser section 2 away from the volute 1 gradually increases. Since the curvature of the curve AB remains unchanged, the endpoint B of the curve AB will gradually move away from the middle part of the diffuser section 2, thereby realizing that the diffuser side wall 23 forms a curved surface shape gradually away from the center of the diffuser section 2, ensuring the air outlet effect of the volute assembly, improving the static pressure capacity and air volume of the fan, and reducing wind noise.

[0051] Optionally, the curve AB is a circular arc or a conic curve, and the opening of the curve AB faces the outside of the diffuser section 2. By using the circular arc or the conic curve with the opening facing the outside of the diffuser section 2, the endpoint B of the curve AB can move away from the middle part of the diffuser section 2 according to the set rule when scanning with the curve AB, thereby ensuring that the shape of the diffuser side wall 23 meets the requirements.

[0052] Specifically, the volute 1 comprises a volute side wall 11, the diffuser side wall 23 is connected with the volute side wall 11, and the diffuser side wall 23 and the volute side wall 11 have a common edge A1A2; the diffuser section 2 is provided with a diffuser outlet 24, the lower end point A1 of the common edge A1A2 projects on the plane where the diffuser outlet 24 is located to form a projection point C1, the upper end point A2 of the common edge A1A2 projects on the plane where the diffuser outlet 24 is located to form a projection point C2, and the lower end point A1, the upper end point A2, the projection point C2 and the projection point C1 form a first plane; in the direction from the lower wall 21 to the upper wall 22, the diffuser angle θ formed between the tangent of the diffuser side wall 23 at the common edge A1A2 and the first plane gradually increases. Due to the gradual increase of the diffuser angle, the diffuser side wall 23 gradually inclines and curves away from the middle part of the diffuser section 2 from bottom to top, so that the shape of the diffuser side wall 23 can meet the requirements.

[0053] The diffuser angle θ satisfies the following functional relationship:

[0054] θ = θ1 + θ2*sin(90*t);

[0055] Wherein, θ1 and θ2 are angle parameters; t is an independent variable, the value range of t is [0, 1], and when t = 0, the diffuser angle θ is the included angle between the tangent of the lower edge of the diffuser side wall 23 and the first plane; when t = 1, the diffuser angle θ is the included angle between the tangent of the upper edge of the diffuser side wall 23 and the first plane. That is, by using the sine function to control the diffuser angle, the design of the shape of the diffuser side wall 23 is further facilitated, and the shape of the diffuser side wall 23 can meet the requirements.

[0056] The angle parameters θ1 and θ2 are angle parameters for controlling the change of the diffuser angle in the scanning direction, the value range of the angle parameter θ1 is 5°≤θ1≤10°, and the value range of the angle parameter θ2 is 2°≤θ2≤8°. When θ1 and θ2 are less than the corresponding preferred range, the diffuser section 2 is not diffused enough in the direction of the diffuser side wall 23, the outlet flow rate of the volute assembly is too large, and the fan noise and air volume are deteriorated; when θ1 and θ2 are greater than the corresponding preferred range, the diffuser degree is too sufficient, which leads to too fast flow rate loss, and the air volume and static pressure level are deteriorated. Only when θ1 and θ2 are in the corresponding preferred range, the diffuser section 2 can be diffused enough in the direction of the diffuser side wall 23, and the outlet flow rate, air volume and static pressure of the volute assembly can be ensured.

[0057] The diffuser section 2 includes a diffuser outlet 24 distal from the volute 1. The diffuser sidewall 23 includes a first side edge A1A2 connected to the volute 1. A diffusion distance L between a point A on the first side edge A1A2 and the plane containing the diffuser outlet 24 gradually increases along the direction from the lower wall 21 to the upper wall 22. Because the volute 1 has a substantially circular cross-section, the dimensions of the lower wall 21 of the diffuser section 2 are necessarily much smaller than those of the upper wall 22 of the diffuser section 2. Consequently, the distance between point A on the first side edge A1A2 and the end face of the diffuser section 2 distal from the volute 1 gradually increases along the direction from the lower wall 21 to the upper wall 22.

[0058] Specifically, the diffusion distance L satisfies the following functional relationship:

[0059] L=ε1a-(ε1a-ε2b)*cos(90*t);

[0060] Where ε1 and ε2 are the diffusion modulation coefficients; a is the characteristic length of the upper profile of the diffuser section 2; b is the characteristic length of the lower profile of the diffuser section 2; t is an independent variable, and its value range is [0, 1]. When t = 0, point A is the endpoint A1 of the first side edge; when t = 1, point A is the endpoint A2 of the first side edge. By using a cosine function to control the diffusion distance L, the design of the shape of the diffuser side wall 23 is further facilitated, ensuring that the shape of the diffuser side wall 23 meets the requirements.

[0061] ε1 and ε2 are modulation coefficients for controlling the starting distance of the pressure diffusion, respectively. The value range of the pressure diffusion modulation coefficient ε1 is 0.5≤ε1≤1; the value range of the pressure diffusion modulation coefficient ε2 is 0.5≤ε2≤1. When ε1 and ε2 are smaller than the corresponding preferred range, the starting position of the pressure diffusion (the first edge A1A2) is too close to the position of the pressure diffusion outlet 24, the pressure diffusion effect is not obvious, and the fan air volume and static pressure levels deteriorate; when ε1 and ε2 are larger than the corresponding preferred range, the starting position of the pressure diffusion is too close to the position where the impeller is set in the volute assembly, resulting in excessive flow rate loss and deterioration of the air volume and static pressure levels; only when ε1 and ε2 are within the corresponding preferred range can the pressure diffusion effect of the pressure diffusion section 2 be guaranteed, and the outlet flow velocity, air volume and static pressure of the volute assembly can also be guaranteed.

[0062] like Figure 6 As shown, Figure 6 Schematic diagram of the scanning cross-sectional profile of the diffuser side wall 23 , where curve AB is the cross-section of the diffuser side wall 23 , line segment AC is the diffusion distance L, and the diffusion angle θ is the angle between line segment AB and line segment AC.

[0063] The volute 1 includes a guide plate 12, and the diffuser section 2 includes an upper wall 22. The upper wall 22 is connected to the upper end of the guide plate 12, and the upper wall 22 gradually tilts downward in the direction away from the guide plate 12. The profile of the guide plate 12 is approximately circular, so that it can enclose a space to accommodate the impeller. The airflow generated by the impeller can flow to the diffuser section 2 under the guiding action of the guide plate 12, and flow outward along the upper wall 22 of the diffuser section 2. At this time, tilting the upper wall 22 downward can improve the aerodynamic and acoustic characteristics of the volute assembly and ensure the degree of diffusion of the volute assembly. There are two volute side walls 11, and the two volute side walls 11 are respectively located on both sides of the guide plate 12. The two volute side walls 11 and the guide plate 12 together form a volute, and a volute air inlet is provided on one of the volute side walls 11.

[0064] Preferably, the profile of the upper wall 22 is an arc line. The arc line is used to further guide the gas discharged from the volute 1, thereby preventing the gas from impacting the diffuser section 2 and generating noise, improving the aerodynamic and acoustic characteristics of the volute assembly, and ensuring the degree of diffusion of the volute assembly.

[0065] The connecting line of the two ends of the profile of the upper wall 22 (such as Figure 3 The downward inclination angle α of the diffuser upper profile formed between MB2 in FIG. 2 and the horizontal plane ranges from 2° ≤ α ≤ 10°. When α is less than 2°, the downward inclination of the upper wall 22 is too small, resulting in insufficient pressure diffusion of the volute assembly and excessive outlet flow velocity, which deteriorates fan noise and air volume. When α is greater than 10°, the downward inclination of the upper wall 22 is too large, resulting in excessive pressure diffusion, which leads to excessive flow velocity loss and deterioration of air volume and static pressure levels. Only when 2° ≤ α ≤ 10° can the aerodynamic and acoustic characteristics of the volute assembly be improved and the pressure diffusion of the volute assembly be guaranteed.

[0066] The diffuser section 2 also includes a lower wall 21, which is connected to the lower end of the guide plate 12 through a volute tongue. The angular range of the volute 1 diffusion angle β formed by the line connecting the two ends of the profile of the upper wall 22 and the line connecting the two ends of the profile of the lower wall 21 is 15°≤β≤30°. The lower wall 21 is also tilted downward, and the inclination angle of the lower wall 21 is controlled by the volute 1 diffusion angle β. When β is less than 15°, the downward inclination of the lower wall 21 is too small, resulting in insufficient diffusion of the volute assembly, excessive outlet flow rate of the volute assembly, and worsening fan noise and air volume. When β is greater than 30°, the downward inclination of the lower wall 21 is too large, resulting in excessive diffusion of the volute assembly, resulting in excessive flow rate loss, worsening air volume and static pressure levels. Only when 15°≤β≤30° can the aerodynamic and acoustic characteristics of the volute assembly be improved and the diffusion of the volute assembly be guaranteed.

[0067] Further, the volute assembly further comprises a volute tongue 3, the diffuser section 2 is connected with the volute 1 through the volute tongue 3, and the size of the volute tongue 3 to the upper wall 22 of the diffuser section 2 gradually decreases from the middle of the volute tongue 3 to the two ends of the volute tongue 3. The volute tongue 3 is used to transitionally connect the guide vane 12 and the lower wall 21 of the diffuser section 2, prevent part of the airflow from circulating in the volute 1, and ensure the reliability of the airflow flowing from the volute 1 into the diffuser section 2. Moreover, the size change of the volute tongue 3 to the upper wall 22 of the diffuser section 2 enables the volute tongue 3 to match the axial velocity distribution of the gas flowing from the volute 1 into the diffuser section 2, effectively weakens the impact of the airflow on the volute tongue 3, and enables the airflow to impact a certain phase difference in the axial direction, thereby reducing the wind dryness of the fan.

[0068] The cross section of the volute tongue 3 is a circular arc, and the radius r of the circular arc satisfies the following functional relationship:

[0069] r = s1δ + s2δ*sin(90*t);

[0070] wherein s1 and s2 are radius adjustment coefficients; δ is the minimum gap between the volute tongue 3 and the impeller arranged in the volute assembly; t is an independent variable, the value range of t is [0, 1], t=0 is the first end of the volute tongue 3, and t=1 is the second end of the volute tongue 3. By using a sine function to control the radius r of the circular arc of the volute tongue 3, the shape of the volute tongue 3 is further facilitated to be designed, and it is ensured that the shape of the diffuser side wall 23 meets the requirements.

[0071] The radius adjustment coefficients s1 and s2 are specific parameters for describing the degree of the volute tongue 3 being inclined and concave downward, the value range of s1 is 0.4≤s1≤0.8, and the value range of s2 is 0.6≤s2≤1.2. When s1 and s2 are too large, the volute tongue 3 is concave downward too much, which deteriorates the air volume and static pressure of the fan; when s1 and s2 are too small, the volute tongue 3 is not concave downward enough, which cannot effectively enable the impact of the airflow to produce a phase difference in the axial direction, the noise reduction effect is poor, and only when s1 and s2 are in the set range, the volute tongue 3 can match the axial velocity distribution of the gas flowing from the volute 1 into the diffuser section 2, effectively weaken the impact of the airflow on the volute tongue 3, and enable the airflow to impact a certain phase difference in the axial direction, thereby reducing the wind dryness of the fan

[0072] The value range of the minimum gap δ is 6mm≤δ≤12mm. When the value of the minimum gap δ is greater than the preferred range, the circulation in the volute 1 is intensified, and the air volume and static pressure are seriously attenuated; when the value of the minimum gap δ is less than the preferred range, the impact of the airflow is increased, which deteriorates the noise, and there is a risk of assembly; only when 6mm≤δ≤12mm, the installation of the impeller is reliable, and the gas flow in the volute 1 is reliable.

[0073] As Figure 7 shown, Figure 7 is a structural schematic view of the volute tongue 3, wherein the volute tongue 3 is formed by a circular arc GH along a straight line scanning.

[0074] The volute assembly, the fan and the air conditioner provided by the patent have a 2.3% increase in the wind volume at the same rotating speed compared with the prior art, wherein the volute 1 of the prior art scheme adopts a conventional outlet diffuser section 2 and a flat volute tongue 3, and the remaining structural parameters are consistent with the patent scheme, and the specific simulation results are as follows:

[0075]

[0076] A fan comprising the volute assembly.

[0077] An air conditioner comprising the volute assembly or the fan.

[0078] The above-mentioned embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the utility model. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A volute assembly, characterized by: The volute (1) comprises: a diffuser section (2) arranged on the volute (1) and communicating with the volute (1); the diffuser section (2) comprises opposite lower and upper walls (21, 22) and a diffuser side wall (23) between the lower and upper walls (21, 22), the diffuser side wall (23) gradually inclines outwardly of the diffuser section (2) in a direction away from the volute (1) and gradually inclines outwardly of the diffuser section (2) in a direction from the lower wall (21) to the upper wall (22). The diffuser side wall (23) is formed by scanning a curve AB in a direction from the lower wall (21) to the upper wall (22), a scanning path of an end point A of the curve AB forms a first side edge of the diffuser side wall (23) close to the volute (1), and a scanning path of an end point B of the curve AB forms a second side edge of the diffuser side wall (23) away from the volute (1).

2. The volute assembly of claim 1, wherein: The curve AB is a circular arc or a conic curve, and an opening of the curve AB faces outwardly of the diffuser section (2).

3. The volute assembly of claim 2, wherein:

4. The volute assembly according to claim 1, wherein: the volute (1) comprises a volute side wall (11), the diffuser side wall (23) is connected to the volute side wall (11), and the diffuser side wall (23) and the volute side wall (11) have a common edge A1A2; a diffuser air outlet (24) is arranged on the diffuser section (2), a lower end point A1 of the common edge A1A2 projects on a plane of the diffuser air outlet (24) to form a projection point C1, an upper end point A2 of the common edge A1A2 projects on the plane of the diffuser air outlet (24) to form a projection point C2, and the lower end point A1, the upper end point A2, the projection point C2 and the projection point C1 form a first plane; in a direction from the lower wall (21) to the upper wall (22), a diffuser angle θ between a tangent of the diffuser side wall (23) at the common edge A1A2 and the first plane gradually increases. The diffuser angle θ satisfies the following functional relationship:

5. The volute assembly of claim 4, wherein: θ = θ1 + θ2 * sin(90 * t); wherein θ1 and θ2 are angle parameters, t is an independent variable, the value range of t is [0, 1], when t = 0, the diffuser angle θ is an included angle between a tangent of a lower edge of the diffuser side wall (23) and the first plane, and when t = 1, the diffuser angle θ is an included angle between a tangent of an upper edge of the diffuser side wall (23) and the first plane. The value range of the angle parameter θ1 is 5° ≤ θ1 ≤ 10°, and / or the value range of the angle parameter θ2 is 2° ≤ θ2 ≤ 8°.

6. The volute assembly of claim 5, wherein: ​ 7. The volute assembly of claim 1, wherein: The diffuser section (2) comprises a diffuser outlet (24) away from the volute (1), and the diffuser side wall (23) has a first side along A1A2 connected with the volute (1), and the diffuser distance L between the point A on the first side along A1A2 and the plane where the diffuser outlet (24) is gradually increases in the direction from the lower wall (21) to the upper wall (22).

8. The volute assembly of claim 7, wherein: The diffuser distance L satisfies the following functional relationship: L = ε1a - (ε1a - ε2b) * cos(90*t); Wherein, ε1, ε2 are diffuser modulation coefficients; a is the characteristic length of the upper line of the diffuser section (2); b is the characteristic length of the lower line of the diffuser section (2); t is an independent variable, the value range of t is [0, 1], and when t = 0, point A is the end point A1 of the first side; when t = 1, point A is the end point A2 of the first side.

9. The volute assembly of claim 8, wherein: The value range of the diffuser modulation coefficient ε1 is 0.5 ≤ ε1 ≤ 1; and / or, the value range of the diffuser modulation coefficient ε2 is 0.5 ≤ ε2 ≤ 1.

10. The volute assembly of claim 1, wherein: The volute (1) comprises a guide plate (12), and the diffuser section (2) comprises an upper wall (22) connected with the upper end of the guide plate (12), and the upper wall (22) gradually inclines downward in the direction away from the guide plate (12).

11. The volute assembly of claim 10, wherein: The upper wall (22) is a circular arc line.

12. A volute assembly according to claim 10 or 11, characterised in that: The angle range of the diffuser upper line inclination angle α formed between the line connecting the two ends of the upper wall (22) and the horizontal plane is 2° ≤ α ≤ 10°.

13. The volute assembly of claim 10, wherein: The diffuser section (2) further comprises a lower wall (21) connected with the lower end of the guide plate (12) through a volute tongue (3), and the angle range of the volute (1) diffusion angle β formed between the line connecting the two ends of the upper wall (22) and the line connecting the two ends of the lower wall (21) is 15° ≤ β ≤ 30°.

14. The volute assembly according to claim 1, characterized in that: The volute assembly further comprises a volute tongue (3), and the diffuser section (2) is connected with the volute (1) through the volute tongue (3), and the size of the volute tongue (3) to the upper wall (22) of the diffuser section (2) gradually decreases from the middle of the volute tongue (3) to the two ends of the volute tongue (3).

15. The volute assembly of claim 14, wherein: The cross section of the volute tongue (3) is a circular arc, and the radius r of the circular arc satisfies the following functional relationship: r = s1δ + s2δ*sin(90*t); Wherein, s1, s2 are radius adjustment coefficients; δ is the minimum gap between the volute tongue (3) and the impeller arranged in the volute assembly; t is an independent variable, the value range of t is [0, 1], and when t = 0, it is the first end of the volute tongue (3); when t = 1, it is the second end of the volute tongue (3).

16. The volute assembly of claim 15, wherein: The value range of the radius adjustment coefficient s1 is 0.4 ≤ s1 ≤ 0.8; and / or, the value range of the radius adjustment number s2 is 0.6 ≤ s2 ≤ 1.2; and / or, the value range of the minimum gap δ is 6mm ≤ δ ≤ 12mm.

17. A fan, characterized by: The volute assembly of any one of claims 1 to 16. The volute assembly of any one of claims 1 to 16.

18. An air conditioner characterized by comprising: A volute assembly according to any one of claims 1 to 16 or a fan according to claim 17.

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