Centrifugal fan and air conditioning equipment with same

Abstract

The utility model provides a centrifugal fan and air conditioning equipment with the same. The centrifugal fan comprises a machine shell and an impeller. The impeller is arranged in the machine shell and is configured to conduct air inlet in the axial direction and conduct air outlet in the radial direction. The shell is provided with a volute which is bent and extends along the peripheral side of the impeller; the two ends of the volute are spaced to define an air outlet. The volute comprises a first volute section, a second volute section, a third volute section and a volute tongue section which are sequentially connected. And the volute tongue section is bent and extends from the end part of the third volute section to the direction far away from the impeller. And the inner surface of the second volute section is an arc surface. According to the centrifugal fan, by improving the bending shape of the inner surface of the volute, the airflow flowing curve is improved, and whistling generated during operation of the centrifugal fan is reduced.

Description

Technical Field

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

[0002] The working principle of a centrifugal fan is to generate centrifugal force by rotating the impeller at high speed, so that air enters the centrifugal fan from the inlet located in the axial direction of the impeller, and under the action of the impeller rotation, it leaves the impeller radially and is discharged from the outlet of the centrifugal fan in conjunction with the volute of a specific shape.

[0003] The performance of a centrifugal fan largely depends on its structural design, especially the shape of the volute, which has a significant impact on the fan's operating characteristics. To improve the air delivery efficiency of centrifugal fans, existing centrifugal fans generally reduce the distance between the impeller and the volute to increase the impeller size. However, this also makes the centrifugal fan prone to producing whistling noises during operation, affecting the user's daily experience. Utility Model Content

[0004] One objective of this invention is to reduce the whistling noise generated during the operation of centrifugal fans.

[0005] Another objective of this invention is to provide an air conditioning device that solves the aforementioned problems.

[0006] According to one aspect of the present invention, a centrifugal fan is provided, the centrifugal fan comprising: a casing and an impeller.

[0007] The impeller is housed inside the casing and configured to allow air to enter axially and exit radially.

[0008] The casing has a volute that bends and extends along the circumference of the impeller; the two ends of the volute are spaced apart to define the air outlet.

[0009] Furthermore, the volute comprises a first volute segment, a second volute segment, a third volute segment, and a volute tongue segment connected in sequence.

[0010] The volute tongue segment bends and extends away from the end of the third volute segment in a direction away from the impeller.

[0011] Furthermore, the inner surface of the second volute segment is an arc surface.

[0012] Optionally, the axis of the inner surface of the second volute section coincides with the axis of rotation of the impeller.

[0013] Optionally, the diameter of the impeller is denoted as D, and the distance t between the second volute section and the impeller is configured as 0.065D≤t≤0.095D, or 0.075D≤t≤0.09D.

[0014] Optionally, the included angle θ1 between the two ends of the inner surface of the second volute section and the rotation axis of the impeller is configured as 12°≤θ1≤18°.

[0015] Optionally, the first volute section is configured such that the distance between it and the impeller gradually decreases in the direction of extension from the air outlet to the second volute section.

[0016] Optionally, the inner surface of the third volute segment is a flat surface.

[0017] Furthermore, the angle θ2 between the inner surface of the third volute segment and the tangent at the junction of the second volute segment is configured as 170°≤θ2≤180°, or 170°≤θ2≤175°.

[0018] Optionally, the diameter of the impeller is denoted as D, and the inner surface extension length m of the third volute section is configured as 0.1D≤m≤0.13D, or 0.11D≤m≤0.12D.

[0019] Optionally, the inner surface of the volute tongue segment is an arc surface.

[0020] Optionally, the inner surface radius r of the volute tongue segment is configured as 0.03D≤r≤0.06D, or 0.035D≤r≤0.045D; and / or

[0021] The angle θ3 of the inner surface of the volute tongue segment is configured as 100°≤θ3≤150°, or 120°≤θ3≤150°.

[0022] According to another aspect of the present invention, the present invention also provides an air conditioning device, the air conditioning device including a centrifugal fan, which is any of the centrifugal fans described above.

[0023] The centrifugal fan of this invention includes a casing and an impeller. The impeller is disposed within the casing and configured to allow air to enter axially and exit radially. The casing has a volute extending and bending along the circumference of the impeller; the two ends of the volute are spaced apart to define an outlet. The volute includes a first volute section, a second volute section, a third volute section, and a volute tongue section connected in sequence. The volute tongue section bends and extends from the end of the third volute section away from the impeller. The inner surface of the second volute section is an arc surface. The centrifugal fan of this invention improves the airflow curve and reduces the whistling noise generated during operation by modifying the bending shape of the inner surface of the volute.

[0024] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of some specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0025] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0026] Figure 1 This is a schematic diagram of a centrifugal fan according to an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A schematic diagram of the interior of a centrifugal fan is shown.

[0028] Figure 3 and Figure 4 yes Figure 2 A magnified view of part A in the middle;

[0029] Figure 5 This is a schematic diagram of an air conditioning device according to an embodiment of the present invention. Detailed Implementation

[0030] In the description of this embodiment, 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", "axial", "radial", "circumferential", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0031] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," etc., may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature.

[0032] In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0033] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," and "coupling," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Furthermore, in the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0035] In other words, in the description of this utility model, "above," "on top of," and "over" the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature. "Below," "under," or "below" the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicating that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this utility model, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, device, material, or characteristic described in connection with that 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, devices, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of the embodiments of this utility model shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0038] Figure 1 This is a schematic diagram of a centrifugal fan 20 according to an embodiment of the present invention; Figure 2 yes Figure 1 A plan view of the interior of the centrifugal fan 20 shown; Figure 3 and Figure 4 yes Figure 2 A magnified view of part A in the middle.

[0039] refer to Figure 1 and Figure 2As shown, this embodiment provides a centrifugal fan 20, which includes a casing 30 and an impeller 40. The impeller 40 is disposed within the casing 30 and configured to allow air to enter axially and exit radially. The casing 30 has a volute 32 that bends and extends along the circumference of the impeller 40; the two ends of the volute 32 are spaced apart to define an outlet 30A.

[0040] Centrifugal fan 20 is prone to producing whistling noise during operation, affecting the user's daily experience. Through extensive experimental research, the applicant discovered that the magnitude of the whistling noise produced by centrifugal fan 20 is mainly affected by the area near the volute tongue on the volute housing 32. Therefore, in this embodiment, the centrifugal fan 20 designs the volute housing 32 to include a first volute segment 321, a second volute segment 322, a third volute segment 323, and a volute tongue segment 324 connected in sequence. (Reference) Figure 3 As shown, the volute tongue segment 324 bends and extends from the end of the third volute segment 323 in a direction away from the impeller 40. Furthermore, the inner surface of the second volute segment 322 is an arc surface.

[0041] refer to Figure 2 and Figure 3 As shown, in Figure 2 From the perspective shown, the volute tongue segment 324 serves as the lower side of the air outlet 30A. The third volute segment 323, the second volute segment 322, and the first volute segment 321 extend clockwise from the end of the volute tongue segment 324 in sequence. The first volute segment 321 extends to the top of the volute tongue segment 324 and is spaced vertically from the volute tongue segment 324, serving as the upper side of the air outlet 30A.

[0042] In this embodiment, the second volute segment 322 is located near the volute tongue segment 324. By setting the inner surface of the second volute segment 322 as an arc surface, the airflow curve of the centrifugal fan 20 at the volute tongue is improved. Experimental tests show that this can reduce the whistling noise generated by the centrifugal fan 20 during operation.

[0043] It should be noted that, in this embodiment, the inner surface of the second volute segment 322 refers to the surface of the second volute segment 322 near the impeller 40. In this embodiment, the inner surface of any segment of the volute 32, including the first volute segment 321, the second volute segment 322, the third volute segment 323, and the volute tongue segment 324, refers to the surface near the impeller 40 or facing the air outlet 30A. In other words, the inner surface of any segment of the volute 32 refers to the surface used to guide the airflow blown out by the impeller 40.

[0044] In this embodiment, the housing 30 generally also has side plates located on both sides of the impeller 40 along the axial direction. The two side plates and the two ends of the spaced volute 32 together define the air outlet 30A.

[0045] In some alternative embodiments, the volute may further extend from the end of the first volute segment 321 and / or the volute tongue segment 324 toward the outside of the air outlet 30A to communicate the air outlet 30A with an opening on the surface of the housing 30.

[0046] In some alternative embodiments, the axis of the inner surface of the second volute segment 322 coincides with the axis of rotation of the impeller 40. That is, in this embodiment, the inner surface of the second volute segment 322, which is an arc surface, is coaxial with the impeller 40, so the distance between any position on the second volute segment 322 and the impeller 40 is the same.

[0047] In some alternative embodiments, the diameter of the impeller 40 is denoted as D, and the distance t between the second volute section 322 and the impeller 40 is configured as 0.065D≤t≤0.095D, or may be further configured as 0.075D≤t≤0.09D.

[0048] Through extensive experimental testing, the applicant discovered that when the value of t is less than this range, the distance between the impeller 40 and the volute tongue section 324 on the volute 32 is too close, which significantly increases the whistling sound generated by the centrifugal fan 20 during operation. Conversely, when the value of t is greater than this range, the distance between the impeller 40 and the volute tongue section 324 on the volute 32 is too far, which leads to a decrease in the air delivery efficiency of the centrifugal fan 20. Therefore, in this embodiment, the distance t between the second volute section 322 and the impeller 40 is configured as 0.065D≤t≤0.095D. Furthermore, the applicant also found that when the value of t is further configured as 0.075D≤t≤0.09D, the whistling sound generated by the centrifugal fan 20 during operation is smaller, and the air delivery efficiency of the centrifugal fan 20 is higher.

[0049] In this embodiment, the diameter D of the impeller 40 refers to the diameter of the blade portion of the impeller 40, that is, the diameter of the rotation trajectory of the outer edge of the blade.

[0050] In some alternative embodiments, the included angle θ1 between the two ends of the inner surface of the second volute section 322 and the rotation axis of the impeller 40 is configured as 12°≤θ1≤18°.

[0051] The angle θ1 between the two ends of the inner surface of the second volute segment 322 and the rotation axis of the impeller 40 refers to the angle between the lines connecting the two ends of the inner surface of the second volute segment 322 and the rotation axis of the impeller 40. In this embodiment, because the axis of the inner surface of the second volute segment 322 coincides with the rotation axis of the impeller 40, the angle θ1 between the two ends of the inner surface of the second volute segment 322 and the rotation axis of the impeller 40 is the angle of the inner surface of the second volute segment 322, which is an arc surface.

[0052] Through extensive experimental testing, the applicant discovered that when θ1 is less than this range, the length of the second volute section 322 is too short, significantly reducing its impact on airflow at the volute tongue of the centrifugal fan 20 and noticeably weakening its whistle-reducing effect. When θ1 is greater than this range, the length of the second volute section 322 is too long, affecting the overall shape of the volute 32 and causing a decrease in the air delivery efficiency of the centrifugal fan 20. Therefore, in this embodiment, the included angle θ1 between the two ends of the inner surface of the second volute section 322 and the rotation axis of the impeller 40 is configured to be 12°≤θ1≤18°, which can reduce the whistle generated by the centrifugal fan 20 during operation without affecting its air delivery efficiency.

[0053] In some alternative embodiments, the first volute section 321 is configured such that the distance between it and the impeller 40 gradually decreases in the direction of extension from the outlet 30A to the second volute section 322.

[0054] refer to Figure 2 As shown, in this embodiment, the first volute segment 321 is the volute 32 from... Figure 2 The portion of the upper side of the air outlet 30A extending counterclockwise to the second volute section 322, as viewed from a certain angle. In this embodiment, the first volute section 321 is smoothly bent in its extending direction, thereby improving the flow curve of the airflow on the surface of the first volute section 321.

[0055] In this embodiment, the first volute segment 321 is not limited to being bent into an arc shape in every part, but may have a portion of its inner surface that is flat, for example, as shown in the figure. Figure 2 As shown, the inner surface of the portion near the air outlet 30A is flat.

[0056] In some alternative embodiments, the inner surface of the third volute segment 323 is a flat surface. Furthermore, the angle θ2 between the tangents of the inner surface of the third volute segment 323 and the second volute segment 322 at their junction is configured as 170°≤θ2≤180°, or may be further configured as 170°≤θ2≤175°.

[0057] refer to Figure 4 As shown, in this embodiment, the inner surface of the third volute segment 323 can be located in the extending direction of the second volute segment 322, that is, θ2 can be equal to 180°. However, the applicant found that when the inner surface of the third volute segment 323 is slightly bent away from the impeller 40, the whistling noise generated by the centrifugal fan 20 during operation can be better reduced. That is, the tangent angle θ2 between the inner surface of the third volute segment 323 and the second volute segment 322 at the junction can be configured as 170°≤θ2≤175°, or in other words, the inner surface of the third volute segment 323 is bent away from the impeller 40 by 5° to 10° relative to the extending direction of the inner surface of the second volute segment 322.

[0058] In some alternative embodiments, the inner surface extension length m of the third volute segment 323 is configured to be 0.1D≤m≤0.13D, or may be further configured to be 0.11D≤m≤0.12D.

[0059] The applicant found that the third volute segment 323, which has a certain length and a flat inner surface, can better reduce the whistling noise generated by the centrifugal fan 20 when it works in conjunction with the second volute segment 322. The effect of reducing the whistling noise is significantly improved when the inner surface extension length m of the third volute segment 323 is in the range of 0.1D≤m≤0.13D, and the effect of reducing the whistling noise is best when m is in the range of 0.11D≤m≤0.12D.

[0060] In some alternative implementations, the inner surface of the volute tongue segment 324 is an arc surface.

[0061] In some alternative implementations, the inner surface radius r of the volute tongue segment 324 is configured to be 0.03D≤r≤0.06D, or may be further configured to be 0.035D≤r≤0.045D.

[0062] In some alternative embodiments, the angle θ3 of the inner surface of the volute tongue 324 is configured to be 100°≤θ3≤150°, or may be further configured to be 120°≤θ3≤150°.

[0063] In this embodiment, the centrifugal fan 20 effectively reduces the whistling noise generated during operation by improving the shape of the volute 32, without affecting the overall size of the centrifugal fan 20 and ensuring that the performance of the centrifugal fan 20 is basically unaffected.

[0064] Figure 5 This is a schematic diagram of an air conditioning device 10 according to an embodiment of the present invention.

[0065] The centrifugal fan 20 in this embodiment can be used in any kind of air conditioning device 10. For example, the air conditioning device 10 can be the indoor unit or outdoor unit of an air conditioner, or it can be an integrated window air conditioner, a central air conditioner, a ceiling-mounted air conditioner, etc. It can also be other air conditioning devices 10 besides air conditioners such as air purifiers and dehumidifiers. There are no limitations here.

[0066] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A centrifugal fan, characterized in that... include: chassis; as well as An impeller is disposed within the casing and configured to allow air to enter axially and exit radially. in The housing has a volute extending and bending along the circumference of the impeller; the two ends of the volute are spaced apart to define an air outlet; and The volute comprises a first volute segment, a second volute segment, a third volute segment, and a volute tongue segment connected in sequence; wherein... The volute tongue segment bends and extends from the end of the third volute segment in a direction away from the impeller; and The inner surface of the second volute segment is an arc surface.

2. The centrifugal fan according to claim 1, characterized in that... The axis of the inner surface of the second volute section coincides with the axis of rotation of the impeller.

3. The centrifugal fan according to claim 2, characterized in that... The diameter of the impeller is denoted as D, and the distance t between the second volute section and the impeller is configured as 0.065D≤t≤0.095D, or 0.075D≤t≤0.09D.

4. The centrifugal fan according to claim 2, characterized in that... The included angle θ1 between the two ends of the inner surface of the second volute section and the rotation axis of the impeller is configured as 12°≤θ1≤18°.

5. The centrifugal fan according to claim 1, characterized in that... The first volute section is configured such that the distance between it and the impeller gradually decreases in the direction of extension from the air outlet to the second volute section.

6. The centrifugal fan according to claim 1, characterized in that... The inner surface of the third volute segment is a flat surface; and The angle θ2 between the inner surface of the third volute segment and the tangent at the junction of the second volute segment is configured as 170°≤θ2≤180°, or 170°≤θ2≤175°.

7. The centrifugal fan according to claim 6, characterized in that... The diameter of the impeller is denoted as D, and the inner surface extension length m of the third volute section is configured as 0.1D≤m≤0.13D, or 0.11D≤m≤0.12D.

8. The centrifugal fan according to claim 1, characterized in that... The inner surface of the volute tongue segment is an arc surface.

9. The centrifugal fan according to claim 8, characterized in that... The inner surface radius r of the volute tongue segment is configured such that 0.03D≤r≤0.06D, or 0.035D≤r≤0.045D; and / or The angle θ3 of the inner surface of the volute tongue segment is configured as 100°≤θ3≤150°, or 120°≤θ3≤150°.

10. An air conditioning device, characterized in that... include: Centrifugal fan, wherein the centrifugal fan is the centrifugal fan according to any one of claims 1-9.

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