Volute, centrifugal fan and air conditioning device

Abstract

The utility model discloses a volute, centrifugal fan and air conditioning equipment, include: spiral body, spiral body includes opposite first end and second end, two side plates, two side plates are respectively established in the both sides of spiral body, to and spiral body form volute chamber, two air inlets and air outlet, volute chamber links two air inlets and air outlet, two air inlets are respectively established in the both sides of spiral body, and the air outlet is established in the second end, wherein, in the center line direction of two air inlets, the width of spiral body at the first end is less than the width of the second end. Through setting up the width of second end is greater than the width of first end, reach the effect of increasing the cross section area of volute, gradually reduce the air velocity, convert part kinetic energy into static pressure energy, improve the fan outlet pressure effect, realize in increasing the cross section area of fan volute, avoid the influence fan performance.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a volute, a centrifugal fan, and an air conditioning device. Background Technology

[0002] In related technologies, the axial dimension of the volute is usually widened to increase the flow cross-sectional area of ​​the fan. However, the increased axial dimension of the fan directly leads to a smaller distance between the motor and the volute inside the air conditioning equipment, which obstructs the air intake of the fan and affects its performance.

[0003] Therefore, how to increase the cross-sectional area of ​​the fan casing while avoiding affecting the fan performance is a problem that urgently needs to be solved in this field. Utility Model Content

[0004] This utility model provides a volute, a centrifugal fan, and an air conditioning device to solve at least one of the aforementioned technical problems.

[0005] In a first aspect, the present invention provides a volute, comprising: a spiral body, the spiral body including a first end and a second end opposite to each other;

[0006] Two side plates are respectively disposed on both sides of the spiral body to form a volute with the spiral body;

[0007] The spiral chamber has two air inlets and one air outlet, and the two air inlets are connected to the two air inlets and the air outlet. The two air inlets are respectively located on both sides of the spiral body, and the air outlet is located at the second end.

[0008] In the direction of the line connecting the centers of the two air inlets, the width of the spiral body at the first end is smaller than the width at the second end.

[0009] The width gradually increases along the direction from the first end to the second end.

[0010] The side plate satisfies the following relationship:

[0011] 0≤θ≤8°;

[0012] Wherein, θ is the angle between the side plate and the radial direction, the radial direction is the direction of the line connecting the first end and the second end, and the radial direction is perpendicular to the direction of the line connecting the center.

[0013] The volute includes a guide ring, which is disposed on the side plate and located at the edge of the air inlet. The shape of the guide ring matches the shape of the air inlet.

[0014] The guide ring includes a guide ring body and a guide plate. One end of the guide ring body is connected to the side plate. The guide plate includes a connecting end and an extension end. The connecting end is connected to the other end of the guide ring body. The extension end extends into the volute. The extension length of the extension end at the first end is less than the extension length of the extension end of the guide ring at the second end.

[0015] In the direction of the center line, the distance between the ends of the extensions of the two guide rings is equal, so that the distance between the guide rings and the impeller is equal.

[0016] The extended end of the guide ring has a serrated structure.

[0017] The volute also includes:

[0018] A diffuser, which is connected to the air outlet;

[0019] The volute tongue is located at the air outlet, in the area near the diffuser.

[0020] The distance between the two ends of the diffuser in the width direction gradually increases in the direction away from the volute tongue, and the width direction is parallel to the direction of the center line.

[0021] It also includes a clearance platform, which is located at the air inlet and is arranged around the edge of the air inlet.

[0022] Secondly, this utility model provides a centrifugal fan, comprising:

[0023] The volute described in any of the above embodiments;

[0024] An impeller is disposed in the volute chamber and is positioned opposite to the two air inlets.

[0025] The impeller includes blades and a reinforcing frame, the reinforcing frame being configured to match the blades, and the reinforcing outer diameter of the reinforcing frame being larger than the rotation diameter of the blades.

[0026] Thirdly, this utility model provides an air conditioning device, comprising:

[0027] The centrifugal fan described in any of the above embodiments.

[0028] The volute, centrifugal fan, and air conditioning equipment of this application include a spiral body comprising a first end and a second end; two side plates respectively disposed on both sides of the spiral body to form a volute chamber; two air inlets and an air outlet connected to the volute chamber; the two air inlets respectively disposed on both sides of the spiral body; and the air outlet disposed at the second end; wherein, along the line connecting the centers of the two air inlets, the width of the spiral body at the first end is smaller than the width at the second end. The volute orderly gathers the airflow from the impeller, avoiding disordered diffusion that leads to energy loss; and smoothly guides the airflow to the outlet according to the spiral body of the volute, reducing eddies and turbulence, and minimizing flow losses; furthermore, by setting the width of the second end to be greater than the width of the first end, the cross-sectional area of ​​the volute is increased, gradually reducing the airflow velocity, converting some kinetic energy into static pressure energy, and increasing the fan outlet pressure, thus achieving the effect of increasing the cross-sectional area of ​​the fan volute while avoiding affecting the fan performance.

[0029] In other words, by setting the width of the spiral body at the first end to be smaller than the width at the second end, the defect that the space in the involute direction is limited and cannot be further expanded can be made up. When the volute is applied to a centrifugal fan, the dynamic pressure energy of the gas flowing out of the centrifugal fan impeller can be fully converted into static pressure energy in the volute, reducing the loss of dynamic pressure and reducing flow noise.

[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the impeller installed inside the volute of this utility model embodiment;

[0035] Figure 4 This is a schematic cross-sectional view of the AA section of the volute according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic cross-sectional view of the AA section of the volute according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the volute structure according to an embodiment of the present invention.

[0040] Explanation of key component reference numerals:

[0041] 100. Volute; 10. Spiral body; 11. First end; 12. Second end; 20. Side plate; 30. Air inlet; 31. Serrated structure; 40. Air outlet; 50. Guide ring; 60. Diverter; 70. Volute tongue; 80. Clearance platform; 200. Impeller. Detailed Implementation

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] This disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0047] The involute shape of the fan casing determines the flow trajectory of the fluid within it. To increase the cross-sectional area of ​​the casing and provide sufficient space for fluid flow to accommodate the gradual decrease in velocity and increase in pressure after exiting the impeller, related technologies typically increase the involute radially (e.g., from the center of the impeller to the tip of the blade). However, excessive increases in radial dimension can cause interference between the fan and surrounding components, and may even prevent installation from meeting requirements. Therefore, the radial expansion range of the involute is limited by the overall size and structure of the unit. If the axial dimension of the casing is widened to increase the cross-sectional area, the increased axial dimension of the fan directly reduces the distance between the motor and the casing within the air conditioning unit, obstructing the fan's air intake and resulting in poor fan performance, low efficiency, and high noise.

[0048] Therefore, how to increase the cross-sectional area of ​​the fan casing while avoiding affecting the fan performance is a problem that urgently needs to be solved in this field.

[0049] Please see Figures 1 to 8This utility model provides a volute 100, a centrifugal fan, and an air conditioning device. The volute 100 can be used in a centrifugal fan, and the centrifugal fan can be used in an air conditioning device. The centrifugal fan includes a volute 100 and an impeller 200 disposed within the volute 100. The volute 100 provides mechanical protection for the impeller 200 and other internal components, while also supporting the overall structure.

[0050] Optionally, the air conditioning equipment may include a casing and a heat exchanger, a motor, and a centrifugal fan housed within the casing. The motor drives the impeller 200 of the centrifugal fan to rotate. The casing has an air inlet and an air outlet. The centrifugal fan may be positioned near the air inlet, and the heat exchanger near the air outlet, with the air outlet 40 facing the heat exchanger. When the air conditioning equipment is running, the motor drives the impeller 200 to rotate, and outside air enters the casing through the air inlet. The centrifugal fan then blows the airflow towards the heat exchanger, where it is exchanged for heat before being discharged through the air outlet, thus achieving the cooling or heating process of the air conditioning equipment.

[0051] Please see Figures 1 to 8 The volute 100 of this application will now be described in detail. The volute 100 includes:

[0052] The spiral body 10 includes a first end 11 and a second end 12 opposite to each other.

[0053] Two side plates 20 are respectively disposed on both sides of the spiral body 10 to form a spiral chamber with the spiral body 10;

[0054] Two air inlets 30 and air outlets 40 are connected to the volute. The two air inlets 30 are respectively located on both sides of the spiral body 10, and the air outlets 40 are located at the second end 12.

[0055] In the direction of the center line connecting the two air inlets 30, the width of the spiral body 10 at the first end 11 is smaller than the width of the second end 12.

[0056] The spiral body 10 is typically spiral-shaped and is used to guide the fluid to flow along a preset path after it flows out of the impeller 200. The first end 11 is the starting section of the volute 100, which is close to the outlet of the impeller 200 and is located at the initial collection position of the fluid. The second end 12 is the final section close to the air outlet 40.

[0057] The two side plates 20 are respectively connected to the two sides of the spiral body 10, and together with the spiral body 10, they form a closed volute. The volute can include a spiral cavity, which is a channel for fluid flow. The volute is connected to the air inlet 30 and the air outlet 40.

[0058] The air inlet 30 is used to receive the fluid flowing into the impeller 200, and the air outlet 40 is used to discharge the fluid that has completed energy conversion out of the volute 100.

[0059] Specifically, the volute 100 guides fluid (gas or liquid) from the inlet 30 into the impeller 200, collects the fluid ejected by the high-speed rotation of the impeller 200, converts the kinetic energy generated by the high-speed flow into static pressure energy, and guides the fluid out of the outlet 40. The volute 100 orderly gathers the airflow from the impeller 200, avoiding energy loss due to disordered diffusion; and according to the spiral structure of the volute 100, it smoothly guides the airflow to the outlet, reducing eddies and turbulence, and minimizing flow losses. The volute 100 includes a spiral body 10, two side plates 20, two air inlets 30, and an air outlet 40. The two side plates 20 are respectively disposed on both sides of the spiral body 10, thereby forming a volute with the spiral body 10. The two air inlets 30 can be respectively disposed on the two side plates 20. The air outlet 40 is disposed at the second end 12. The impeller 200 is disposed in the volute and is opposite to the two air inlets 30. Fluid enters the impeller 200 through the air inlets 30, enters the volute, reaches the first end 11, and finally leaves the volute through the air outlet 40 at the second end 12.

[0060] In the direction of the line connecting the centers of the two air inlets 30, the width of the spiral body 10 at the first end 11 is smaller than the width at the second end 12, that is, the cross-sectional area of ​​the volute increases along the fluid flow direction (from the first end 11 to the second end 12). When the fluid enters the volute from the impeller 200 and reaches the first end 11, the flow velocity is relatively high and the kinetic energy is relatively large, which can avoid the generation of eddies. As the fluid flows towards the outlet 40 of the second end 12, the cross-sectional area of ​​the volute increases. According to the continuity equation of fluid mechanics (when the flow rate is constant, the flow velocity is inversely proportional to the cross-sectional area) and Bernoulli's principle (kinetic energy and pressure energy can be converted into each other, and the pressure increases when the flow velocity decreases), the flow velocity of the fluid at the second end 12 decreases and the kinetic energy is converted into static pressure energy. This makes the cross-sectional area of ​​the flow increase along the direction of fluid flow, the fluid velocity decreases steadily, and the conversion of kinetic energy into static pressure energy is more complete, thus improving the efficiency of the centrifugal fan. It is only necessary to set the width of the second end 12 to be greater than the width of the first end 11 to achieve the effect of gradually reducing the airflow velocity, converting part of the kinetic energy into static pressure energy, and increasing the outlet pressure of the fan.

[0061] Thus, the volute 100 includes a spiral body 10, which includes a first end 11 and a second end 12 opposite to each other; two side plates 20, which are respectively disposed on both sides of the spiral body 10 to form a volute chamber with the spiral body 10; two air inlets 30 and an air outlet 40, which are connected to the volute chamber; the two air inlets 30 are respectively disposed on both sides of the spiral body 10, and the air outlet 40 is disposed at the second end 12; wherein, in the direction of the center line connecting the two air inlets 30, the width of the spiral body 10 at the first end 11 is smaller than the width of the second end 12. The volute 100 orderly gathers the airflow from the impeller 200, avoiding energy loss caused by disordered diffusion; and the spiral body 10 of the volute 100 smoothly guides the airflow to the outlet, reducing eddies and turbulence, and minimizing flow losses; furthermore, by setting the width of the second end 12 to be greater than the width of the first end 11, the cross-sectional area of ​​the volute 100 is increased, gradually reducing the airflow velocity, converting some kinetic energy into static pressure energy, and increasing the outlet pressure of the fan. This achieves the effect of increasing the cross-sectional area of ​​the fan volute 100 while avoiding affecting the fan performance.

[0062] In other words, by setting the width of the spiral body 10 at the first end 11 to be smaller than the width of the second end 12, the defect that the space in the involute direction is limited and cannot be further expanded can be made up. When the volute 100 is applied to the centrifugal fan, the dynamic pressure energy of the gas flowing out of the impeller 200 of the centrifugal fan can be fully converted into static pressure energy in the volute 100, thereby reducing the loss of dynamic pressure and reducing flow noise.

[0063] Optionally, the width gradually increases along the direction from the first end 11 to the second end 12.

[0064] The width increases smoothly along the direction from the first end 11 to the second end 12, which can reduce turbulence and eddies in the volute, avoid fluid impact caused by abrupt changes in the cross-sectional area of ​​the flow, reduce flow loss, and at the same time avoid noise caused by eddy breakage, ensuring a smooth conversion of kinetic energy into static pressure energy.

[0065] In some embodiments, the side plate 20 satisfies the following relationship:

[0066] 0≤θ≤8°;

[0067] Wherein, θ is the angle between the side plate 20 and the radial direction, the radial direction is the direction of the line connecting the first end 11 and the second end 12, and the radial direction is perpendicular to the direction of the line connecting the center.

[0068] θ can be 0°, 1°, 2°, 3°, 4°, 7°, 8°, etc.

[0069] Specifically, please refer to Figure 3, the volute 100 is used to convert the high-speed fluid discharged by the impeller 200 into static pressure energy. It can be understood that the radial direction is the main flow direction of the fluid in the volute chamber, θ is the inclination angle of the side plate 20 inclined radially outward. When θ > 0°, the cross-sectional area of the flow passage of the volute chamber gradually increases along the radial direction, meeting the requirement of converting the kinetic energy of the fluid into static pressure energy. When θ > 8°, the inclination angle of the side plate 20 is too large, which may cause the sudden expansion of the flow passage, trigger the separation of the fluid boundary layer, and increase the energy loss and noise (for example, through comparative experimental tests, the volute 100 of the embodiment of the present application can reduce the noise by 1 to 2 decibels under the same air volume). By setting 0 ≤ θ ≤ 8°, the expansion rate of the flow passage and the fluid stability can be balanced, the high-frequency noise generated by the vortex breakdown can be reduced, the fluid can flow more smoothly in the volute chamber, the frictional noise between the fluid and the side plate 20 and the spiral body 10 can be reduced, and the continuous and smooth inclination angle makes the shape of the volute chamber flow passage more reasonable, the fluid flow trajectory is stable, the pressure fluctuation is reduced, and the stability of the air volume and pressure output by the fan is improved.

[0070] In some embodiments, the volute 100 includes a guide ring 50, and the guide ring 50 is provided on the side plate 20 at the edge of the air inlet 30, and the shape of the guide ring 50 matches the shape of the air inlet 30.

[0071] Please refer to Figure 4 , where the guide ring 50 includes a guide ring body 51 and a guide plate 52. One end of the guide ring body 51 is connected to the side plate 20. The guide plate 52 includes a connection end 521 and an extension end 522. The connection end 521 is connected to the other end of the guide ring body 51, and the extension end 522 extends into the volute chamber.

[0072] Among them, in the direction of the center line, the distances between the ends of the extension ends 522 of the two guide rings 50 are equal, so that the distances between the guide rings 50 and the impeller 200 are equal.

[0073] Among them, the extension length of the extension end 522 at the first end 11 is less than the extension length of the extension end 522 at the second end 12 (such as Figure 5 , h3 < h2).

[0074] Among them, a serrated structure 31 is provided at the end of the extension end 522.

[0075] Among them, the guide ring 50 can be a flow collecting structure provided on the side plate 20 at the edge of the air inlet 30, matching the shape of the air inlet 30 (such as annular, arc-shaped, etc.), and used to guide the fluid to smoothly enter the volute chamber from the air inlet 30 and restrict the initial flow direction of the air flow.

[0076] Among them, the guide ring 50 includes a guide ring body 51 and a guide plate 52. The extension end 522 of the guide plate 52 can include an end extending into the volute chamber, that is, the end away from the side plate 20.

[0077] The guide ring body 51 is connected to the side plate 20, which is used to fix the guide ring 50, transmit structural support force, and ensure that the guide ring 50 is stably positioned under fluid pressure.

[0078] Specifically, please refer to Figure 3 The volute 100 includes two guide rings 50, which are disposed on the side plate 20 and located at the edge of the air inlet 30. The shape of the guide rings 50 matches the shape of the air inlet 30. Each guide ring 50 includes a guide ring body 51 and a guide plate 52. One end of the guide ring body 51 is connected to the side plate 20, and the other end is connected to the connecting end 521 of the guide plate 52. The extension end 522 of the guide plate 52 extends into the volute. The extension length of the extension end 522 at the first end 11 is less than the extension length of the extension end 522 at the second end 12. The distance between the ends of the two extension ends 522 is equal everywhere (for example, see [reference]). Figure 5 The distance h5 between the two guide rings 50 at the first end 11 and the distance h4 between the two ends 12 are equal, so that the spacing between the guide rings 50 and the impeller 200 is (e.g., Figure 4 Since the spacing h1) is equal everywhere, after installing the impeller 200 in the volute, the constant gap between the guide ring 50 and the end of the impeller 200 effectively reduces gas leakage and backflow, allowing the airflow to exit more smoothly from the volute 100, reducing pressure fluctuations and ensuring the stability of the fan output. Furthermore, the serrated structure 31 at the end of the extension end 522 can interfere with the separation of the airflow boundary layer. While smooth structures tend to form large-scale vortices at their ends, increasing energy loss and noise, the serrated structure 31 can cut the vortices into small-scale, low-energy turbulence, reducing flow resistance.

[0079] Please see Figure 7 and Figure 8 In some embodiments, the volute 100 further includes:

[0080] Diffuser 60, diffuser 60 is connected to air outlet 40;

[0081] The volute tongue 70 is located at the air outlet 40, in the area near the diffuser 60.

[0082] Among them, the distance h6 between the two ends of the diffuser 60 in the width direction gradually increases in the direction away from the volute tongue 70, and the width direction is parallel to the direction of the center line.

[0083] The diffuser 60 can be a tubular channel structure connected to the air outlet 40 of the volute 100. The diffuser 60 can further expand the flow channel, thereby converting the kinetic energy of the fluid into static pressure energy.

[0084] The volute tongue 70 can be a protruding structure located near the diffuser port 60 at the air outlet 40. It can be arc-shaped or wedge-shaped. The volute tongue 70 can be located at the connection position between the end of the spiral body 10 and the diffuser port 60. It is used to separate the fluid flowing out of the volute chamber and block the fluid from forming a circulating vortex at the air outlet 40.

[0085] Specifically, the volute 100 also includes a diffuser 60 connected to the air outlet 40. The diffuser 60 gradually widens in the direction away from the volute tongue 70. When the fluid flows through the diffuser 60, the flow velocity will gradually decrease (gradual widening can ensure that the flow velocity decreases uniformly). The kinetic energy is more fully converted into static pressure energy, thereby increasing the static pressure at the fan outlet. The volute tongue 70 can guide the fluid into the diffuser 60 to ensure the continuity of energy conversion. It can effectively block backflow and guide the fluid to smoothly enter the diffuser 60.

[0086] In some embodiments, the volute 100 further includes an avoidance platform 80, which is disposed at the air inlet 30 and surrounds the edge of the air inlet 30.

[0087] Among them, the avoidance platform 80 can be a recessed structure located at the air inlet 30 and surrounding the edge of the air inlet 30.

[0088] Specifically, in a conventional volute tongue 70 design, the gap at the reinforcing frame of the impeller 200 is minimal, making it prone to scratching between the impeller 200 and the volute 100, and the volute 100 does not adequately protect the impeller 200. However, in this embodiment, the impeller 200 includes blades and a reinforcing frame. The reinforcing frame is matched to the blades, and its reinforcing outer diameter is larger than the inlet diameter of the air inlet 30 (the maximum outer diameter when the blades rotate). The reinforcing frame provides rigid support for the entire impeller 200. The volute 100 also includes a clearance platform 80 located at the air inlet 30, which provides additional space for the reinforcing frame. This ensures that the minimum gap between the impeller 200 and the volute 100 is not less than the minimum gap between the blades of the impeller 200 and the volute 100, increasing the structural safety of the impeller 200 and preventing scratching between the blades of the impeller 200 and the volute 100.

[0089] Optionally, please refer to Figure 7 The side panels can also have a certain curvature or bend.

[0090] This application also proposes a centrifugal fan, including an impeller 200 and a volute 100 as described in any of the above embodiments. The impeller 200 is disposed in the volute and is arranged opposite to the two air inlets 30. The impeller 200 includes blades and a reinforcing frame, the reinforcing frame being matched to the blades, and the reinforcing outer diameter of the reinforcing frame being larger than the rotational diameter of the blades. For simplicity, further details are omitted here.

[0091] This application also proposes an air conditioning device, which includes the centrifugal fan described in any of the above embodiments. For the sake of brevity, further details are omitted here.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A volute (100), characterized in that, include: A spiral body (10) comprising opposing first end (11) and second end (12); Two side plates (20) are respectively disposed on both sides of the spiral body (10) to form a volute with the spiral body (10); Two air inlets (30) and one air outlet (40) are provided. The volute is connected to the two air inlets (30) and the two air outlets (40). The two air inlets (30) are respectively located on both sides of the spiral body (10), and the air outlet (40) is located at the second end (12). In the direction of the center line connecting the two air inlets (30), the width of the spiral body (10) at the first end (11) is smaller than the width of the second end (12).

2. The volute (100) according to claim 1, characterized in that, The width gradually increases along the direction from the first end (11) to the second end (12).

3. The volute (100) according to claim 1 or 2, characterized in that, The side plate (20) satisfies the following relationship: 0≤θ≤8°; Wherein, θ is the angle between the side plate (20) and the radial direction, the radial direction is the direction of the line connecting the first end (11) and the second end (12), and the radial direction is perpendicular to the direction of the center line.

4. The volute (100) according to claim 1, characterized in that, The volute (100) includes a guide ring (50), which is disposed on the side plate (20) and located at the edge of the air inlet (30). The shape of the guide ring (50) matches the shape of the air inlet (30).

5. The volute (100) according to claim 4, characterized in that, The guide ring (50) includes a guide ring body (51) and a guide plate (52). One end of the guide ring body (51) is connected to the side plate (20). The guide plate (52) includes a connecting end (521) and an extension end (522). The connecting end (521) is connected to the other end of the guide ring body (51). The extension end (522) extends into the volute. The extension length of the extension end (522) at the first end (11) is less than the extension length of the extension end (522) of the guide ring (50) at the second end (12).

6. The volute (100) according to claim 5, characterized in that, In the direction of the center line, the distance between the ends of the two extension ends (522) is equal, so that the spacing between the guide ring (50) and the impeller (200) is equal.

7. The volute (100) according to claim 6, characterized in that, The end of the extension (522) of the guide ring (50) is provided with a serrated structure (31).

8. The volute (100) according to claim 1, characterized in that, The volute (100) also includes: A diffuser (60) is connected to the air outlet (40); The volute (70) is located at the air outlet (40) in the area near the diffuser (60).

9. The volute (100) according to claim 8, characterized in that, The distance between the two ends of the diffuser (60) in the width direction gradually increases in the direction away from the volute tongue (70), and the width direction is parallel to the direction of the center line.

10. The volute (100) according to claim 1, characterized in that, It also includes a clearance platform (80), which is located at the air inlet (30) and is arranged around the edge of the air inlet (30).

11. A centrifugal fan, characterized in that, include: The volute (100) according to any one of claims 1-10; Impeller (200), the impeller (200) is disposed in the volute and is arranged opposite to the two air inlets (30).

12. The centrifugal fan according to claim 11, characterized in that, The impeller (200) includes blades and a reinforcing frame, the reinforcing frame being configured to match the blades, and the reinforcing outer diameter of the reinforcing frame being larger than the rotational diameter of the blades.

13. An air conditioning device, characterized in that, include: The centrifugal fan according to claim 11 or 12.

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