Volute assembly, fan and air conditioner

Abstract

The invention 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 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 invention relates to the technical field of fans, in particular to a volute component, a fan and an air conditioner. Background Art

[0002] A centrifugal fan is generally composed of an impeller and a volute, wherein the volute concentrates and guides the gas leaving the impeller and further converts part of the kinetic energy into static pressure. In the prior art, the design of the volute outlet position usually includes two parts: the outlet diffuser and the volute tongue. The design of the two parts 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 and the volute tongue to match different application conditions has become a problem that technicians in this field need to solve urgently. Summary of the invention

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

[0004] A volute assembly, comprising:

[0005] snail shell;

[0006] A diffuser section, wherein the diffuser section is disposed on the volute and is in communication with the volute;

[0007] The diffuser section includes a relative lower wall and an upper wall and a diffuser side wall located between the lower wall and the upper wall. In the direction away from the volute, the diffuser side wall gradually inclines toward the outside of the diffuser section, and in the direction from the lower wall to the upper wall, the diffuser side wall gradually inclines toward the outside of the diffuser section.

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

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

[0010] The volute includes a volute sidewall, the diffuser sidewall is connected to the volute sidewall, and the diffuser sidewall and the volute sidewall have a common edge A1A2;

[0011] The diffuser section is provided with a diffuser outlet, the lower end point A1 of the common edge A1A2 is projected on the plane where the diffuser outlet is located to form a projection point C1, the upper end point A2 of the common edge A1A2 is projected on the plane where the diffuser outlet 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;

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

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

[0014] θ=θ1+θ2*sin(90*t);

[0015] Among them, θ1 and θ2 are angle parameters; t is an independent variable, the value range of t is [0, 1], and when t=0, the diffusion angle θ is the angle between the tangent of the lower edge of the diffusion side wall and the first plane; when t=1, the diffusion angle θ is the angle between the tangent of the upper edge of the diffusion 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 outlet away from the volute, and the diffuser side wall has a first side edge A1A2 connected to the volute. Along the direction from the lower wall to the upper wall, the diffuser distance L between point A on the first side edge A1A2 and the plane where the diffuser outlet is located gradually increases.

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

[0019] L=ε1a-(ε1a-ε2b)*cos(90*t);

[0020] Among them, ε1 and ε2 are diffusion modulation coefficients; a is the characteristic length of the upper profile of the diffuser section; b is the characteristic length of the lower profile 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 pressure spreading modulation coefficient ε1 is 0.5≤ε1≤1; and / or the value range of the pressure spreading modulation coefficient ε2 is 0.5≤ε2≤1.

[0022] The volute includes a guide plate, and the diffuser section includes an upper wall, wherein the upper wall is connected to the upper end of the guide plate, and the upper wall gradually slopes downward in a direction away from the guide plate.

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

[0024] The downward inclination angle α of the diffuser upper profile formed between the connecting line of 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 also includes a lower wall, which is connected to the lower end of the guide plate through a volute tongue, and the angle range of the volute diffusion angle β formed by the connecting line of the two ends of the profile line of the upper wall and the connecting line of the two ends of the profile line of the lower wall is 15°≤β≤30°.

[0026] The volute assembly also includes a volute tongue, and the diffuser section is connected to the volute through the volute tongue. The size of the volute tongue to the upper wall of the diffuser section gradually decreases from the middle of the volute tongue to both ends of the volute tongue.

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

[0028] r=s1δ+s2δ*sin(90*t);

[0029] Among them, 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 at the first end of the volute tongue; when t=1, it is at 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 coefficient s2 is 0.6≤s2≤1.2; and / or, the value range of the minimum gap δ is 6mm≤δ≤12mm.

[0031] A fan comprises the volute assembly mentioned above.

[0032] An air conditioner comprises the above-mentioned volute assembly or the above-mentioned fan.

[0033] The volute assembly, fan and air conditioner provided by the present invention limit the shape of the diffuser side wall of the diffuser section. The shape of the diffuser side wall is inclined outward in the airflow direction and in the direction from bottom to top, so that the diffuser side wall forms a curved surface shape that gradually moves away from the center of the diffuser section. This enables the distribution of the diffuser section and the degree of diffusion to be reliably controlled to match the velocity distribution of the airflow discharged from the volute, thereby solving the hidden danger of excessive air outlet velocity 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 wind noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a volute assembly provided in an embodiment of the present invention;

[0035] Figure 2 Another schematic diagram of the structure of the volute assembly provided by an embodiment of the present invention;

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

[0037] Figure 4 for Figure 3 A partial schematic diagram of the

[0038] Figure 5 A schematic diagram of the structure of a diffuser section provided in an embodiment of the present invention;

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

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

[0041] In the figure:

[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

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 used to limit the present invention.

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" 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 direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] A centrifugal fan is generally composed of an impeller and a volute, wherein the volute concentrates and guides the gas leaving the impeller and further converts part of the kinetic energy into static pressure. In the prior art, the design of the volute outlet position usually includes two parts: the outlet diffuser and the volute tongue. The design of the two parts 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 and the volute tongue to match different application conditions has become a problem that technicians in this field need to solve urgently.

[0050] To this end, the present application provides a Figures 1 to 7The volute assembly shown includes: a volute 1; a diffuser section 2, wherein the diffuser section 2 is arranged on the volute 1 and is communicated with the volute 1; the diffuser section 2 includes a relative lower wall 21 and an upper wall 22 and a diffuser side wall 23 located between the lower wall 21 and the upper wall 22, and the diffuser side wall 23 gradually inclines toward the outside of the diffuser section 2 along the direction away from the volute 1, and gradually inclines toward the outside of the diffuser section 2 along the direction from the lower wall 21 to the upper wall 22. 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 airflow direction and in the direction from bottom to top, so that the diffuser side wall 23 forms a curved surface shape that gradually moves away from the center of the diffuser section 2, thereby being able to reliably control the distribution of the diffuser section 2 and the degree of diffusion to match the velocity distribution of the airflow discharged from the volute 1, thereby solving the hidden danger of excessive velocity at the outlet 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 a diffuser outlet 24 is provided on the end face of the diffuser section 2 away from the volute 1, and the diffuser outlet 24 constitutes the outlet of the volute assembly.

[0051] 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 end point A of the curve AB forms the first side edge of the diffuser side wall 23 close to the volute 1, and the scanning path of the end point B of the curve AB forms the second side edge of the diffuser side wall 23 away from the volute 1. Since the cross-section of the volute 1 is approximately circular, the size of the lower wall 21 of the diffuser section 2 must be 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 end point 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 end point B of the curve AB will gradually move away from the middle of the diffuser section 2, thereby realizing that the diffuser side wall 23 forms a curved surface shape that gradually moves away from the center of the diffuser section 2, thereby ensuring the air outlet effect of the volute assembly, improving the static pressure capacity and air volume of the fan, and reducing wind noise.

[0052] Optionally, the curve AB is an arc line or a conic curve, and the opening of the curve AB faces the outside of the diffuser section 2. By using the arc line or conic curve with the opening facing the outside of the diffuser section 2, when the curve AB is used for scanning, the end point B of the curve AB can be away from the middle of the diffuser section 2 according to a set rule, thereby ensuring that the shape of the diffuser side wall 23 meets the requirements.

[0053] Specifically, the volute 1 includes 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 provided on the diffuser section 2, the lower end point A1 of the common edge A1A2 is projected on the plane where the diffuser air outlet 24 is located to form a projection point C1, the upper end point A2 of the common edge A1A2 is projected on the plane where the diffuser air 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; along the direction from the lower wall 21 to the upper wall 22, the diffusion angle θ formed between the tangent of the diffuser side wall 23 at the common edge A1A2 and the first plane gradually increases. As the diffusion angle gradually increases, the diffusion side wall 23 gradually bends from bottom to top in a direction away from the middle of the diffusion section 2, thereby ensuring that the shape of the diffusion side wall 23 meets the requirements.

[0054] The diffusion angle θ satisfies the following functional relationship:

[0055] θ=θ1+θ2*sin(90*t);

[0056] Among them, θ1 and θ2 are angle parameters; t is an independent variable, and the value range of t is [0, 1], and when t=0, the pressure diffusion angle θ is the angle between the tangent line of the lower edge of the pressure diffusion side wall 23 and the first plane; when t=1, the pressure diffusion angle θ is the angle between the tangent line of the upper edge of the pressure diffusion side wall 23 and the first plane. That is, by adopting a sine function to control the pressure diffusion angle, the design of the shape of the pressure diffusion side wall 23 is further facilitated, ensuring that the shape of the pressure diffusion side wall 23 meets the requirements.

[0057] The angle parameters θ1 and θ2 are the angle parameters for controlling the change of the diffusion angle along the scanning direction. The value range of the angle parameter θ1 is 5°≤θ1≤10°; the value range of the angle parameter θ2 is 2°≤θ2≤8°. When θ1 and θ2 are smaller than the corresponding preferred range, the diffusion section 2 does not diffuse sufficiently in the direction of the diffusion side wall 23, the outlet flow velocity of the volute assembly is too large, and the fan noise and air volume will deteriorate. When θ1 and θ2 are larger than the corresponding preferred range, the degree of diffusion is too sufficient, resulting in excessive velocity loss, and deterioration of the air volume and static pressure levels. Only when θ1 and θ2 are in the corresponding preferred range can the diffusion section 2 diffuse sufficiently in the direction of the diffusion side wall 23, and the outlet flow velocity, air volume and static pressure of the volute assembly be guaranteed.

[0058] The diffuser section 2 includes a diffuser outlet 24 away from the volute 1, and the diffuser side wall 23 includes a first side edge A1A2 connected to the volute 1. Along the direction from the lower wall 21 to the upper wall 22, the diffuser distance L between a point A on the first side edge A1A2 and the plane where the diffuser outlet 24 is located gradually increases. Since the cross-section of the volute 1 is approximately circular, the size of the lower wall 21 of the diffuser section 2 must be 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 point A on the first side edge A1A2 and the end face of the diffuser section 2 away from the volute 1 gradually increases.

[0059] Specifically, the diffusion distance L satisfies the following functional relationship:

[0060] L=ε1a-(ε1a-ε2b)*cos(90*t);

[0061] Among them, ε1 and ε2 are diffusion modulation coefficients; a is the characteristic length of the upper profile of the diffusion section 2; b is the characteristic length of the lower profile of the diffusion section 2; t is an independent variable, and 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. By using a cosine function to control the diffusion distance L, the design of the shape of the diffusion side wall 23 is further facilitated to ensure that the shape of the diffusion side wall 23 meets the requirements.

[0062] 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 level 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 velocity loss, and the air volume and static pressure level deteriorate; only when ε1 and ε2 are in 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.

[0063] like Figure 6 As shown, Figure 6 Schematic diagram of the scanning cross-sectional profile of the diffuser side wall 23 , in which curve AB is the cross-section of the diffuser side wall 23 , line segment AC is the diffuser distance L , and the diffuser angle θ is the angle between line segment AB and line segment AC .

[0064] The volute 1 includes a guide plate 12, and the diffuser section 2 includes an upper wall 22, wherein the upper wall 22 is connected to the upper end of the guide plate 12, and the upper wall 22 gradually tilts downward in a direction away from the guide plate 12. The profile of the guide plate 12 is approximately circular, so that a space for accommodating an impeller can be enclosed, and the airflow generated by the impeller can flow to the diffuser section 2 under the guiding effect of the guide plate 12, and flow outward along the upper wall 22 of the diffuser section 2. At this time, the upper wall 22 is tilted downward, which 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, and 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.

[0065] 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, avoid the gas impacting the diffuser section 2 and generating noise, improve the aerodynamic and acoustic characteristics of the volute assembly, and ensure the degree of diffusion of the volute assembly.

[0066] The two ends of the profile line of the upper wall 22 are connected (such as Figure 3 The angle range of the downward inclination angle α of the pressure diffusion upper profile formed between MB2) and the horizontal plane is 2°≤α≤10°. When α<2°, the downward inclination of the upper wall 22 is too small, resulting in insufficient pressure diffusion of the volute assembly, excessive outlet flow velocity of the volute assembly, and deterioration of fan noise and air volume; when α>10°, the downward inclination of the upper wall 22 is too large, and the pressure diffusion is too sufficient, resulting in excessive loss of flow velocity, deterioration of air volume and static pressure level. 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.

[0067] 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 angle range of the diffuser angle β of the volute 1 formed between the two ends of the profile line of the upper wall 22 and the two ends of the profile line 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 diffuser angle β of the volute 1. When β<15°, the downward tilt of the lower wall 21 is too small, so that the diffuser degree of the volute assembly is insufficient, the outlet flow rate of the volute assembly is too large, and the fan noise and air volume will deteriorate; when β>30°, the downward tilt of the lower wall 21 is too large, so that the diffuser degree of the volute assembly is too sufficient, resulting in excessive flow rate loss, and deterioration of air volume and static pressure level; only when 15°≤β≤30° can the aerodynamic and acoustic characteristics of the volute assembly be improved and the diffuser degree of the volute assembly be guaranteed.

[0068] Furthermore, the volute assembly further includes a volute tongue 3, through which the diffuser section 2 is connected to the volute 1, 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 make a transition connection between the guide plate 12 and the lower wall 21 of the diffuser section 2, so as to prevent part of the airflow from circulating in the volute 1, and ensure the reliability of the airflow from the volute 1 to the diffuser section 2. Moreover, by using the size change from the volute tongue 3 to the upper wall 22 of the diffuser section 2, the volute tongue 3 can match the axial velocity distribution of the gas flowing from the volute 1 to the diffuser section 2, effectively weakening the impact of the airflow on the volute tongue 3, and causing a certain phase difference in the axial direction of the airflow impact, thereby reducing the wind noise of the fan.

[0069] The cross section of the volute tongue 3 is an arc shape, and the radius r of the arc shape satisfies the following functional relationship:

[0070] r=s1δ+s2δ*sin(90*t);

[0071] Among them, s1 and s2 are radius adjustment coefficients; δ is the minimum clearance between the volute tongue 3 and the impeller provided in the volute assembly; t is an independent variable, and the value range of t is [0, 1], and when t=0, it is at the first end of the volute tongue 3; when t=1, it is at the second end of the volute tongue 3. By using a sine function to control the arc radius r of the volute tongue 3, the design of the shape of the volute tongue 3 is further facilitated, ensuring that the shape of the diffuser side wall 23 meets the requirements.

[0072] The radius adjustment coefficients s1 and s2 are specific parameters that describe the degree of inclination and concavity of the volute tongue 3. The value range of the radius adjustment coefficient s1 is 0.4≤s1≤0.8; the value range of the radius adjustment coefficient s2 is 0.6≤s2≤1.2. When the values ​​of s1 and s2 are too large, the volute tongue 3 is too concave, which worsens the air volume and static pressure of the fan; when the values ​​of s1 and s2 are small, the degree of concavity of the volute tongue 3 is not enough, and the impact of the airflow cannot effectively produce a phase difference in the axial direction, and the noise reduction effect is poor. Only when s1 and s2 are within the set range, the volute tongue 3 can match the axial velocity distribution of the gas flowing from the volute 1 to the diffuser section 2, effectively weakening the impact of the airflow on the volute tongue 3, and causing the airflow impact to produce a certain phase difference in the axial direction, thereby reducing the wind noise of the fan.

[0073] 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 aggravated, 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 airflow impact is aggravated, the noise is worsened, and there is an assembly risk; only when 6mm≤δ≤12mm can the impeller be reliably installed and the gas flow in the volute 1 be reliable.

[0074] like Figure 7 As shown, Figure 7 Schematic diagram of the structure of the volute tongue 3, wherein the volute tongue 3 is formed by scanning the arc GH along a straight line.

[0075] Compared with the prior art, the volute assembly, fan and air conditioner proposed in this patent have an air volume increase of 2.3% at the same speed. The volute 1 of the prior art solution adopts a conventional outlet diffuser section 2 and a straight volute tongue 3, and the other structural parameters are consistent with the solution of this patent. The specific simulation results are as follows:

[0076]

[0077] A fan comprises the volute assembly mentioned above.

[0078] An air conditioner comprises the above-mentioned volute assembly or the above-mentioned fan.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A volute assembly, characterized in that: include: Volute (1); A diffuser section (2), the diffuser section (2) being arranged on the volute (1), and the diffuser section (2) being in communication with the volute (1); The diffuser section (2) comprises a lower wall (21) and an upper wall (22) opposite to each other, and a diffuser side wall (23) located between the lower wall (21) and the upper wall (22); in a direction away from the volute (1), the diffuser side wall (23) gradually inclines toward the outside of the diffuser section (2); and in a direction from the lower wall (21) to the upper wall (22), the diffuser side wall (23) gradually inclines toward the outside of the diffuser section (2).

2. The volute assembly according to claim 1, characterized in that: 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); the scanning path of the end point A of the curve AB forms a first side edge of the diffuser side wall (23) close to the volute (1), and the scanning path of the end point B of the curve AB forms a second side edge of the diffuser side wall (23) away from the volute (1).

3. The volute assembly according to claim 2, characterized in that: The curve AB is an arc line or a conic curve, and the opening of the curve AB faces the outside of the diffuser section (2).

4. The volute assembly according to claim 1, characterized in that: 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; The diffuser section (2) is provided with a diffuser outlet (24), the lower end point A1 of the common edge A1A2 is projected 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 is projected 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; Along the direction from the lower wall (21) to the upper wall (22), a diffusion angle θ formed between a tangent line of the diffusion side wall (23) at the common edge A1A2 and the first plane gradually increases.

5. The volute assembly according to claim 4, characterized in that: The diffusion angle θ satisfies the following functional relationship: 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], and when t=0, the diffusion angle θ is the angle between the tangent line of the lower edge of the diffusion side wall (23) and the first plane; when t=1, the diffusion angle θ is the angle between the tangent line of the upper edge of the diffusion side wall (23) and the first plane.

6. The volute assembly according to claim 5, characterized in that: 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°.

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

8. The volute assembly according to claim 7, characterized in that: The diffusion distance L satisfies the following functional relationship: L=ε1a-(ε1a-ε2b)*cos(90*t); Wherein, ε1 and ε2 are 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, 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.

9. The volute assembly according to claim 8, characterized in that: The value range of the pressure spreading modulation coefficient ε1 is 0.5≤ε1≤1; and / or the value range of the pressure spreading modulation coefficient ε2 is 0.5≤ε2≤1.

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

11. The volute assembly according to claim 10, characterized in that: The profile of the upper wall (22) is an arc line.

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

13. The volute assembly according to claim 10, characterized in that: The diffuser section (2) further comprises a lower wall (21), wherein the lower wall (21) is connected to the lower end of the guide plate (12) via a volute tongue (3), and the angular range of a diffusion angle β of the volute (1) formed between a line connecting two ends of the profile of the upper wall (22) and a line connecting two ends of the profile 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), the diffuser section (2) is connected to the volute (1) via the volute tongue (3), and the dimension from 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 according to claim 14, characterized in that: The cross section of the volute tongue (3) is in the shape of an arc, and the radius r of the arc satisfies the following functional relationship: r=s1δ+s2δ*sin(90*t); Wherein, s1 and s2 are radius adjustment coefficients; δ is the minimum clearance 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 at the first end of the volute tongue (3); when t=1, it is at the second end of the volute tongue (3).

16. The volute assembly according to claim 15, characterized in that: The value range of the radius adjustment coefficient s1 is 0.4≤s1≤0.8; and / or, the value range of the radius adjustment coefficient 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 in that: A volute assembly comprising the volute assembly described in any one of claims 1 to 16.

18. An air conditioner, characterized in that: The invention comprises the volute assembly according to any one of claims 1 to 16 or the fan according to claim 17.

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