Volute, centrifugal fan and air conditioner

Abstract

The utility model discloses a volute, centrifugal fan and air conditioner, including volute body, the volute body is bent and forms the volute chamber, the volute body sets up the air inlet and the air outlet, the volute chamber intercommunication the air inlet and the air outlet, the air outlet is equipped with volute tongue, baffle, the baffle is located in the inboard wall of the air inlet, and the area close to the volute tongue. Through set up the baffle, the reverse airflow has been blocked from the air inlet from the physical structure, reduce the air -out phenomenon, the baffle can also increase the volute side surface to the impeller's coverage, prevent the area under the pressure pulsation gas to the possible blowing outward, and then has restrained the occurrence of the surge phenomenon, and has improved the anti -pressure ability of fan.

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 conditioner. Background Technology

[0002] The gas flow near the volute of a centrifugal fan is the most unstable, with a large pressure gradient. Under the changing pressure gradient, the area near the volute will experience alternating air intake and exhaust, leading to a decrease in the fan's pressure resistance and, in severe cases, even problems such as surging and abnormal noise.

[0003] Therefore, how to avoid the phenomenon of alternating air intake and exhaust in the vicinity of the volute tongue 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 conditioner to solve at least one of the aforementioned technical problems.

[0005] In a first aspect, the present invention provides a volute housing comprising:

[0006] The volute body is bent to form a volute chamber. The volute body has an air inlet and an air outlet. The volute chamber is connected to the air inlet and the air outlet. The air outlet is provided with a volute tongue.

[0007] A baffle is disposed in the inner wall of the air inlet, near the area of ​​the volute tongue.

[0008] The baffle includes a connecting end and an extending end. The connecting end is fixedly connected to the inner wall of the air inlet, and the extending end extends toward the center of the air inlet.

[0009] The distance between the connecting end and the extension end is less than the radius of the air inlet.

[0010] The baffle satisfies the following relationship:

[0011] 0.02≤(1 / 2*DL) / D≤0.08,

[0012] Where D is the diameter of the air inlet, and L is the straight-line distance between the center of the extension end and the center of the air inlet.

[0013] Wherein, (1 / 2*DL) / D=0.03.

[0014] The volute includes a guide ring, which is disposed on the volute body and located at the edge of the air inlet. The shape of the guide ring matches the shape of the air inlet. The baffle is disposed on the inner sidewall of the guide ring and located in the area near the volute tongue.

[0015] The guide ring and the baffle are integrally formed.

[0016] The volute body includes a first end and a second end, the air outlet is located at the second end, and the baffle satisfies the following relationship:

[0017] 30°≤θ1≤35°; and / or

[0018] 40°≤θ2≤55°;

[0019] Wherein, θ1 is the angle between the direction from the volute tongue to the first end and the direction from the volute tongue to the first connection point, the first connection point including the connection point between the baffle and the air inlet, θ2 is the angle between the direction from the volute tongue to the first end and the direction from the volute tongue to the second connection point, the second connection point including the connection point between the baffle and the air inlet, and the distance between the first connection point and the volute tongue is less than the distance between the second connection point and the volute tongue.

[0020] Where θ1 = 33°, θ2 = 49°.

[0021] The volute also includes:

[0022] A diffuser is connected to the air outlet. The distance between the two ends of the diffuser in the width direction gradually increases in the direction away from the volute tongue. The width direction is the same as the extension direction of the volute tongue.

[0023] It also includes: a fan flange, which is disposed between the diffuser and the air outlet.

[0024] It also includes a clearance platform, which is located at the air inlet and is arranged around the edge of the air inlet.

[0025] Secondly, this utility model provides a centrifugal fan, comprising:

[0026] The volute described in any of the above embodiments;

[0027] An impeller is disposed in the volute chamber and is positioned opposite to the two air inlets.

[0028] 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.

[0029] Thirdly, this utility model provides an air conditioner, comprising:

[0030] The centrifugal fan described in any of the above embodiments.

[0031] The volute, centrifugal fan, and air conditioner described in this application include a volute body and a baffle. The volute body is bent to form a volute chamber. The volute body has an air inlet and an air outlet, and the volute chamber connects the air inlet and the air outlet. The air outlet has a volute tongue. The baffle is located in the inner wall of the air inlet, near the volute tongue. By setting the baffle, reverse airflow is physically blocked from flowing out of the air inlet, reducing airflow problems. The baffle also increases the coverage of the volute side of the impeller, preventing gas from blowing outwards in this area under pressure pulsation, thereby suppressing surge and improving the fan's pressure resistance.

[0032] 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

[0033] 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:

[0034] Figure 1 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the impeller installed inside the volute of this utility model embodiment;

[0036] Figure 3 This is a schematic diagram of the AA cross-section of the volute according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0039] Figure 6 This is a structural diagram of the volute according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the volute structure according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the impeller installed inside the volute of this utility model embodiment.

[0042] Explanation of key component reference numerals:

[0043] 100. Volute; 10. Volute body; 11. Air inlet; 12. Air outlet; 13. Volute tongue; 20. Baffle; 21. Connecting end; 22. Extension end; 30. Guide ring; 40. Diffuser; 50. Fan flange; 200. Impeller. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] The function of the volute in a centrifugal fan is to prevent the gas flowing out of the impeller from circulating inside the volute. Usually, this part is the closest to the impeller in terms of structure, and the gas flow in the vicinity is the most unstable. The pressure gradient of the airflow is very large. In addition, the collector itself is the air inlet. Under the changing pressure gradient, the collector in the vicinity of the volute is in a state of alternating air intake and exhaust, which leads to a decrease in the fan's pressure resistance. In severe cases, it may even cause problems such as surging and abnormal noise.

[0050] How to avoid the phenomenon of alternating air intake and exhaust in the collector area near the volute tongue is an urgent problem to be solved in this field.

[0051] Please see Figures 1 to 8 This utility model provides a volute 100, a centrifugal fan, and an air conditioner. The volute 100 can be used in a centrifugal fan, and the centrifugal fan can be used in an air conditioner. 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.

[0052] Optionally, the air conditioner 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 may be positioned near the air outlet, with the air outlet 12 facing the heat exchanger. When the air conditioner 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 conditioner.

[0053] Please see Figures 1 to 8 The volute 100 of this application will now be described in detail. The volute 100 includes:

[0054] The volute body 10 is bent to form a volute chamber. The volute body 10 has an air inlet 11 and an air outlet 12. The volute chamber is connected to the air inlet 11 and the air outlet 12. The air outlet 12 is provided with a volute tongue 13.

[0055] Baffle 20 is located in the inner wall of air inlet 11, near the area of ​​volute tongue 13.

[0056] The volute body 10 can be an involute body of the volute 100. The involute body is usually spiral-shaped and is used to guide the fluid to flow along a preset path after it flows out of the impeller 200. The volute chamber can connect the air inlet 11 and the air outlet 12 to collect the fluid thrown out by the impeller 200 and guide it to flow from the air inlet 11 to the air outlet 12, thus completing the conversion of kinetic energy into static pressure energy.

[0057] The volute tongue 13 can be a protruding structure located at the air outlet 12, and can be arc-shaped or wedge-shaped. The volute tongue 13 can be used to separate the fluid flowing out of the volute chamber, force the fluid to flow towards the air outlet 12, and block the fluid from forming a circulating vortex at the air outlet 12.

[0058] The air inlet 11 is used to receive the fluid flowing into the impeller 200, and the air outlet 12 is used to discharge the fluid that has completed energy conversion out of the volute 100.

[0059] The baffle 20 can be a plate-like structure near the region of the volute tongue 13, extending into the volute chamber to increase the coverage of the impeller 200.

[0060] Specifically, the volute 100 includes a volute body 10 that is bent to form a volute chamber. The volute body 10 is bent to form a volute chamber. The volute body 10 has an air inlet 11 and an air outlet 12. The volute chamber connects the air inlet 11 and the air outlet 12. The air outlet 12 is provided with a volute tongue 13. Since the volute tongue 13 is close to both the impeller 200 and the air outlet 12, the pressure gradient is large and the flow field is unstable. This can easily lead to the phenomenon of alternating air intake and exhaust at the air inlet 11 (for example, if the instantaneous pressure near the volute tongue 13 is higher than that outside the air inlet 11, the fluid may flow out in the opposite direction from the air inlet 11 (exhaust), which will disrupt the continuity of air intake, reduce the pressure resistance of the fan, and even cause surge). By setting baffle 20, which is located on the inner side wall of air inlet 11, the reverse airflow is physically blocked from flowing out of air inlet 11, reducing the air outlet phenomenon. In addition, baffle 20 can also guide the airflow to enter impeller 200 more smoothly, weaken the influence of pressure fluctuation near volute tongue 13 on air inlet 11, balance the pressure gradient, and make the air intake state more stable.

[0061] Thus, the volute 100 includes a volute body 10 and a baffle 20. The volute body 10 is bent to form a volute chamber. The volute body 10 has an air inlet 11 and an air outlet 12. The volute chamber connects the air inlet 11 and the air outlet 12. The air outlet 12 is provided with a volute tongue 13. The baffle 20 is located in the inner wall of the air inlet 11, near the area of ​​the volute tongue 13. By setting the baffle 20, the reverse airflow is physically blocked from flowing out of the air inlet 11, reducing the outflow phenomenon. The baffle 20 can also increase the coverage of the side of the volute 100 on the impeller 200, preventing the possibility of gas blowing outward under pressure pulsation in this area, thereby suppressing the occurrence of surge phenomenon and improving the pressure resistance of the fan.

[0062] In some embodiments, the baffle 20 includes a connecting end 21 and an extension end 22, the connecting end 21 being fixedly connected to the inner sidewall of the air inlet 11, and the extension end 22 extending toward the center of the air inlet 11.

[0063] The distance between the connecting end 21 and the extension end 22 is less than the radius of the air inlet 11 to avoid excessive obstruction affecting air intake.

[0064] The connecting end 21 of the baffle 20 is fixedly connected to the inner wall of the air inlet 11 to fix the baffle 20, ensure that the baffle 20 is stably positioned under fluid pressure, and seamlessly connect with the inner wall of the air inlet 11 to avoid airflow leakage.

[0065] The extension end 22 can be one end of the baffle 20 extending towards the center of the air inlet 11. The extension end 22 can partially cover the impeller 200 to block the reverse airflow. It can be understood that the extension length of the extension end 22 directly affects the coverage of the impeller 200. The connection between the extension end 22 of the baffle 20 and the air inlet 11 can be a straight transition or a curved transition, and the embodiments of this application do not limit this.

[0066] Optionally, the baffle 20 satisfies the following relationship:

[0067] 0.02≤(1 / 2*DL) / D≤0.08,

[0068] Where D is the diameter of the air inlet 11, and L is the straight-line distance between the center of the extension end 22 and the center of the air inlet 11.

[0069] Wherein, (1 / 2*DL) / D=0.03.

[0070] For example, (1 / 2*DL) / D = 0.02, 0.04, 0.05, 0.06, 0.07, etc.

[0071] The straight-line distance L between the center of the extension end 22 and the center of the air inlet 11 can be used to quantify the extent of extension of the extension end 22.

[0072] Specifically, the baffle 20 includes a connecting end 21 and an extension end 22. The connecting end 21 connects to the inner side of the air inlet 11 to fix the baffle 20. The extension end 22 extends towards the center of the air inlet 11 to increase the coverage of the impeller 200, so that the baffle 20 can physically block the reverse airflow from the air inlet 11 and increase the coverage of the impeller 200. By setting 0.02≤(1 / 2*DL) / D≤0.08, taking (1 / 2*DL) / D=0.03 ​​as an example, by quantifying the extension degree of the extension end 22 (i.e., the offset of the extension end 22 relative to the center of the air inlet 11), it is ensured that the coverage is sufficient to suppress the reverse airflow without excessively reducing the effective area of ​​the air inlet 11 and avoiding obstruction of normal air intake. In other words, by suppressing reverse airflow, the baffle 20 reduces the airflow loss at the air inlet 11, enabling the impeller 200 to obtain a more stable air intake and a more stable output pressure (comparative experimental data shows that the external static pressure of the volute 100 in this embodiment is increased by 2% compared with that of a conventional volute 100 at the same speed).

[0073] Optionally, the volute 100 includes a guide ring 30, which is disposed on the volute body 10 and located at the edge of the air inlet 11. The shape of the guide ring 30 matches the shape of the air inlet 11. A baffle 20 is disposed on the inner side wall of the guide ring 30 and located in the area near the volute tongue 13.

[0074] One end of the guide ring 30 is fixedly connected to the volute body 10, and the other end extends into the volute chamber. The guide ring 30 can be used to guide the external airflow smoothly into the volute chamber, constrain the initial flow direction of the airflow, and reduce the air intake resistance.

[0075] Specifically, the volute 100 includes a guide ring 30, which is disposed on the volute body 10 and located at the edge of the air inlet 11. The shape of the guide ring 30 matches the shape of the air inlet 11 (such as circular, wedge, etc.). The baffle 20 can be disposed on the inner side wall of the guide ring 30 (for example, the baffle 20 can be integrally formed with the guide ring 30) in the area close to the volute tongue 13, so as to physically block the reverse airflow from the air inlet 11 and reduce the air outlet phenomenon.

[0076] In some embodiments, the volute body 10 includes a first end and a second end opposite to each other, the air outlet 12 is located at the second end, and the baffle 20 satisfies the following relationship:

[0077] 30°≤θ1≤35°; and / or

[0078] 40°≤θ2≤55°;

[0079] Wherein, θ1 is the angle between the direction from the volute tongue 13 to the first end and the direction from the volute tongue 13 to the first connection point, the first connection point includes the connection point between the baffle 20 and the air inlet 11, θ2 is the angle between the direction from the volute tongue 13 to the first end and the direction from the volute tongue 13 to the second connection point, the second connection point includes the connection point between the baffle 20 and the air inlet 11, and the distance between the first connection point and the volute tongue 13 is less than the distance between the second connection point and the volute tongue 13.

[0080] For example, θ1 = 30°, 32°, 34°, 35°, etc., and θ2 = 40°, 42°, 43°, 45°, 47°, 50°, etc.

[0081] Where θ1 = 33°, θ2 = 49°.

[0082] Please refer to Figure 4 The first connection point can be point E, which is relatively close to the volute tongue 13, among the connection points between the baffle 20 and the air inlet 11 (or the guide ring 30). The second connection point can be point F, which is relatively far from the volute tongue 13, among the connection points between the baffle 20 and the air inlet 11 (or the guide ring 30).

[0083] Where θ1 is the angle between the direction along the volute tongue 13 to the first end and the direction along the volute tongue 13 to the first connecting point, and θ2 is the angle between the direction along the volute tongue 13 to the first end and the direction along the volute tongue 13 to the second connecting point. Please refer to [link to relevant documentation]. Figure 4 The direction from the volute tongue 13 to the first end is the MX direction, θ1 is ∠EMX, and θ2 is ∠FMX.

[0084] Specifically, by controlling the angles θ1 and θ2, the coverage area of ​​the baffle 20 is precisely controlled. The angle range of θ1 and θ2 is a quantitative limit on the coverage rate of the impeller 200 by the baffle 20. θ1 limits the maximum coverage area of ​​the baffle 20 to avoid excessive extension and obstruction of the normal air intake channel. θ2 limits the coverage boundary of the baffle 20 closest to the volute tongue 13, ensuring that the baffle 20 can cover the area with the largest pressure gradient and the most likely reverse airflow. By setting the angles θ1 and θ2, a balance is achieved between suppressing reverse airflow and ensuring air intake efficiency, minimizing the interference of pressure fluctuations on the air inlet 11.

[0085] Please see Figure 5 In some embodiments, the volute 100 further includes:

[0086] The diffuser 40 is connected to the air outlet 12. The distance between the two ends of the diffuser 40 in the width direction gradually increases in the direction away from the volute tongue 13. The width direction is the same as the extension direction of the volute tongue 13.

[0087] The volute 100 also includes a fan flange 50, which is located between the diffuser 40 and the outlet 12.

[0088] The diffuser 40 can be a tubular channel structure connected to the air outlet 12 of the volute 100. The diffuser 40 can further expand the flow channel, thereby converting the kinetic energy of the fluid into static pressure energy.

[0089] Specifically, the volute 100 also includes a diffuser 40 connected to the outlet 12. The diffuser 40 gradually widens axially away from the volute tongue 13. As the fluid flows through the diffuser 40, the flow velocity gradually decreases (gradual widening ensures a uniform velocity reduction), and kinetic energy is more fully converted into static pressure energy, thereby increasing the static pressure at the fan outlet. The volute tongue 13 guides the fluid into the diffuser 40, ensuring the continuity of energy conversion. This effectively blocks backflow and guides the fluid smoothly into the diffuser 40. The volute 100 also includes a fan flange 50, which connects the diffuser 40 and the outlet 12, achieving a stable connection between the diffuser 40 and the outlet 12.

[0090] In some embodiments, the volute 100 also includes a clearance platform disposed at the air inlet 11 and surrounding the edge of the air inlet 11.

[0091] The clearance platform can be a recessed structure located at the air inlet 11 and surrounding the edge of the air inlet 11.

[0092] Specifically, in a conventional volute tongue 13 design, the gap at the reinforcing frame of the impeller 200 is the smallest, making it easy for the impeller 200 to scratch 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 air inlet diameter of the air inlet 11 (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 located at the air inlet 11, which provides extra 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 scratches between the blades of the impeller 200 and the volute 100.

[0093] 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 11. 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 rotation diameter of the blades. For simplicity, further details are omitted here.

[0094] This application also proposes an air conditioner that includes the centrifugal fan described in any of the above embodiments. For the sake of brevity, further details are omitted here.

[0095] 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.

[0096] 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: The volute body (10) is bent to form a volute chamber. The volute body (10) has an air inlet (11) and an air outlet (12). The volute chamber is connected to the air inlet (11) and the air outlet (12). The air outlet (12) is provided with a volute tongue (13). A baffle (20) is provided in the inner wall of the air inlet (11), near the area of ​​the volute tongue (13).

2. The volute (100) according to claim 1, characterized in that, The baffle (20) includes a connecting end (21) and an extension end (22). The connecting end (21) is fixedly connected to the inner wall of the air inlet (11), and the extension end (22) extends toward the center of the air inlet (11).

3. The volute (100) according to claim 2, characterized in that, The distance between the connecting end (21) and the extension end (22) is less than the radius of the air inlet (11).

4. The volute (100) according to claim 2 or 3, characterized in that, The baffle (20) satisfies the following relationship: 0.02≤(1 / 2*DL) / D≤0.08, Wherein, D is the diameter of the air inlet (11), and L is the straight-line distance between the center of the extension end (22) and the center of the air inlet (11).

5. The volute (100) according to claim 4, characterized in that, (1 / 2*DL) / D=0.

03.

6. The volute (100) according to claim 1, characterized in that, The volute (100) includes a guide ring (30), which is disposed on the volute body (10) and located at the edge of the air inlet (11). The shape of the guide ring (30) matches the shape of the air inlet (11). The baffle (20) is disposed on the inner sidewall of the guide ring (30) and located in the area close to the volute tongue (13).

7. The volute (100) according to claim 6, characterized in that, The guide ring (30) and the baffle (20) are integrally formed.

8. The volute (100) according to claim 1, characterized in that, The volute body (10) includes a first end and a second end opposite to each other, the air outlet (12) is located at the second end, and the baffle (20) satisfies the following relationship: 30°≤θ1≤35°; and / or 40°≤θ2≤55°; Wherein, θ1 is the angle between the direction from the volute tongue (13) to the first end and the direction from the volute tongue (13) to the first connection point, the first connection point including the connection point between the baffle (20) and the air inlet (11), θ2 is the angle between the direction from the volute tongue (13) to the first end and the direction from the volute tongue (13) to the second connection point, the second connection point including the connection point between the baffle (20) and the air inlet (11), and the distance between the first connection point and the volute tongue (13) is less than the distance between the second connection point and the volute tongue (13).

9. The volute (100) according to claim 8, characterized in that, θ1 = 33°, θ2 = 49°.

10. The volute (100) according to claim 1, characterized in that, The volute (100) also includes: A diffuser (40) is connected to the air outlet (12). The distance between the two ends of the diffuser (40) in the width direction gradually increases in the direction away from the volute tongue (13). The width direction is the same as the extension direction of the volute tongue (13).

11. The volute (100) according to claim 10, characterized in that, Also includes: A fan flange (50) is disposed between the diffuser (40) and the air outlet (12).

12. The volute (100) according to claim 1, characterized in that, It also includes a clearance platform, which is located at the air inlet (11) and is arranged around the edge of the air inlet (11).

13. A centrifugal fan, characterized in that, include: The volute (100) according to any one of claims 1-12; Impeller (200), the impeller (200) is disposed in the volute and is arranged opposite to the two air inlets (11).

14. The centrifugal fan according to claim 13, 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.

15. An air conditioner, characterized in that, include: The centrifugal fan as described in claim 13 or 14.

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