Centrifugal fan and air conditioner

Abstract

This utility model provides a centrifugal fan and an air conditioner. The centrifugal fan includes a volute, a centrifugal impeller, a volute tongue, and a first planar section. The centrifugal impeller is disposed inside the volute. One end of the first planar section is connected to the volute tongue, and the other end is connected to the volute. The plane where the end of the volute connected to the first planar section and the centerline of the centrifugal impeller lie is a reference plane. This reference plane is perpendicular to the first planar section, thereby reducing noise generated at the volute tongue, thus reducing the noise generated by the centrifugal fan during operation, improving the sound quality of the air conditioner, and ultimately enhancing the user experience.

Description

Technical Field

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

[0002] Existing centrifugal fans often employ a spiral involute structure for part of the volute casing, with the volute tongue connected at the starting point of the spiral involute. Since the volute tongue is at the beginning of the spiral involute, it is a crucial transition area for airflow from the high-pressure zone inside the volute casing to the low-pressure zone outside. When existing centrifugal fans operate, the airflow passing over the volute tongue easily generates noise, resulting in poor sound quality for the centrifugal fan or air conditioner, and consequently, a poor user experience. Utility Model Content

[0003] In view of the above problems, this utility model is proposed to provide a centrifugal fan and air conditioner that overcome or at least partially solve the above problems, and can solve the problem of how to reduce the noise generated by the centrifugal fan during operation and improve the sound quality of the air conditioner. By optimizing the volute structure, the user experience is improved.

[0004] Specifically, this utility model provides a centrifugal fan comprising:

[0005] Snail shell.

[0006] A centrifugal impeller is installed inside the volute.

[0007] Cochlear tongue.

[0008] A first planar segment, one end of which is connected to the volute tongue, and the other end of which is connected to the volute casing. The plane where the end of the volute casing connected to the first planar segment and the centerline of the centrifugal impeller lie is a reference plane, which is perpendicular to the first planar segment.

[0009] Optionally, the distance between one end of the volute connected to the first planar section and the centerline of the centrifugal impeller is less than the distance between other locations of the volute and the centerline of the centrifugal impeller.

[0010] Optionally, the ratio between the distance between the end of the volute connected to the first planar section and the centerline of the centrifugal impeller and the outer diameter of the centrifugal impeller is 0.08 to 0.15.

[0011] Optionally, the junction of the extended surface of the first planar section and the volute is used as a reference line.

[0012] The ratio of the distance between the first planar segment and the reference line to the distance between the reference line and the end of the volute connected to the first planar segment is 0.58 to 0.97.

[0013] Optionally, the centrifugal fan also includes:

[0014] Air vent.

[0015] The volute has a second planar section for forming an air outlet, the second planar section being perpendicular to the first planar section.

[0016] Optionally, the volute tongue has a third planar segment for forming the edge of the air outlet.

[0017] The third plane segment is perpendicular to the first plane segment.

[0018] Optionally, the ratio of the distance between the second planar segment and the third planar segment to the distance between the end of the volute connected to the first planar segment and the second planar segment is 0.55 to 0.95.

[0019] Optionally, the volute tongue further has a volute portion connecting the first planar segment and the third planar segment, the volute tongue portion being curved.

[0020] The cochlear tongue is arc-shaped, and both the first planar segment and the third planar segment are tangent to the cochlear tongue.

[0021] The ratio between the radius of the inner surface of the volute tongue and the outer diameter of the centrifugal impeller is 0.05 to 0.07.

[0022] Optionally, the volute further has an involute section, one end of which is connected to the first planar section, and the other end of which is connected to the second planar section.

[0023] This utility model also provides an air conditioner, including the centrifugal fan described above.

[0024] In this centrifugal fan, when the airflow passes through the volute tongue, the first plane section is perpendicular to the reference plane, which not only reduces the power loss of the airflow when it passes through the volute tongue and improves the air delivery efficiency of the centrifugal impeller, but also effectively reduces the impact force of the airflow hitting the volute tongue under the push of the centrifugal impeller when the airflow flows in the volute casing, reducing the pulse pressure at the volute tongue, thereby reducing the noise generated at the volute tongue, thus reducing the noise generated when the centrifugal fan is working, improving the sound quality of the air conditioner, and thus improving the user experience.

[0025] 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 specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0026] 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:

[0027] Figure 1 This is a schematic structural diagram of a centrifugal fan according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a centrifugal fan according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic cross-sectional view of a centrifugal fan according to an embodiment of the present invention.

[0030] List of reference numerals in the attached diagram:

[0031] 100. Volute; 110. Involute section; 120. Second plane section;

[0032] 200. Cochlear tongue; 210. Cochlear tongue portion; 220. Third plane segment;

[0033] 300. First planar section;

[0034] 400. Centrifugal fan;

[0035] 500. Air vent. Detailed Implementation

[0036] The following reference Figures 1 to 3 This invention describes a centrifugal fan and an air conditioner according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "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 encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0037] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," and "couple" 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.

[0038] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being 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," or "below" of the second feature can mean the first feature is 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.

[0039] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0040] Figure 1 This is a schematic structural diagram of a centrifugal fan according to an embodiment of the present invention, as shown below. Figure 1 As shown, and with reference Figures 2 to 3 This utility model provides a centrifugal fan. The centrifugal fan includes a volute 100, a volute tongue 200, a first planar section 300, and a centrifugal impeller 400.

[0041] The centrifugal impeller 400 is disposed within the volute 100. One end of the first planar section 300 is connected to the volute tongue 200, and the other end is connected to the volute 100. The plane at which the end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 lie is a reference plane, which is perpendicular to the first planar section 300.

[0042] In this embodiment, the centrifugal impeller 400 generates centrifugal force through high-speed rotation, which accelerates the flow of gas in the volute 100 and increases the internal pressure of the volute 100. After entering the volute 100, the gas is discharged from the outlet 500 of the volute 100 by the rotation of the centrifugal impeller 400. The plane where the end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 are located is perpendicular to the first planar section 300, that is, the first planar section 300 is tangent to the end of the volute 100 connected to the first planar section 300.

[0043] When the airflow passes through the volute tongue 200, since the first plane section 300 is perpendicular to the reference plane, it not only reduces the power loss of the airflow when it passes through the volute tongue 200 and improves the air delivery efficiency of the centrifugal impeller 400, but also effectively reduces the impact force of the airflow hitting the volute tongue 200 under the push of the centrifugal impeller 400 when the airflow flows in the volute casing 100, and reduces the pulse pressure at the volute tongue 200, thereby reducing the noise generated at the volute tongue 200. This reduces the noise generated when the centrifugal fan is working, improves the sound quality of the air conditioner, and thus improves the user experience.

[0044] In some embodiments of this utility model, the distance H between one end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 is smaller than the distance between other positions of the volute 100 and the centerline of the centrifugal impeller 400.

[0045] In this embodiment, the distance H between the end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 is smaller than the distance between other positions of the volute 100 and the centerline of the centrifugal impeller 400. This makes the volute 100 appear as a gradually expanding channel starting from the end connected to the first planar section 300, reducing airflow impact loss and noise generated when airflow passes through the first planar section 300, thus improving the user experience.

[0046] In some embodiments of this utility model, such as Figure 3 As shown, the ratio of the distance H between the end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 to the outer diameter D of the centrifugal impeller 400 is 0.08 to 0.15.

[0047] In this embodiment, when the ratio of the distance H between the end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 to the outer diameter D of the centrifugal impeller 400 is less than 0.08, the gap between the volute tongue 200 and the impeller is too small, which will cause airflow blockage, not only increasing flow loss, but also increasing noise generation.

[0048] When the ratio of the distance H between the end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 to the outer diameter D of the centrifugal impeller 400 is greater than 0.15, although the noise generation can be reduced, it will cause the airflow inside the volute 100 to diffuse too quickly, reduce the static pressure recovery efficiency inside the volute 100, and make the centrifugal fan consume more energy.

[0049] When the distance H between the end of the volute 100 connected to the first planar section 300 and the centerline of the centrifugal impeller 400 is limited to 0.08 to 0.15 times the outer diameter D of the centrifugal impeller 400, an optimal balance between aerodynamic performance and noise control can be achieved.

[0050] In some embodiments of this utility model, the junction of the extended surface of the first planar section 300 and the volute 100 is a reference line.

[0051] like Figure 3 As shown, the ratio of the distance L2 between the first plane segment 300 and the reference line to the distance L3 between the first reference line and the end of the volute 100 connected to the first plane segment 300 is 0.58 to 0.97.

[0052] In this embodiment, the ratio of the distance L2 between the first planar section 300 and the reference line to the distance L3 between the first reference line and the end of the volute 100 connected to the first planar section 300 is too small, and the distance between the two ends of the first planar section 300 is too large. This will result in poor airflow guidance effect of the volute tongue 200, and at the same time, it will reduce the size of the air outlet 500 and reduce the air outlet efficiency.

[0053] The ratio of the distance L2 between the first plane section 300 and the reference line to the distance L3 between the first reference line and the end of the volute 100 connected to the first plane section 300 is too large, and the distance between the two ends of the first plane section 300 is too small. This will cause the volute tongue 200 to be too close to the starting section of the volute 100, causing the airflow to form a large-angle impact at the leading edge of the volute tongue 200. This will not only increase the flow loss, but also easily generate vortex noise.

[0054] When the ratio of the distance L2 between the first plane segment 300 and the reference line and the distance L3 between the first reference line and the end of the volute 100 connected to the first plane segment 300 is between 0.58 and 0.97, the volute tongue 200 satisfies the airflow guiding function and avoids the situation where the volute tongue 200 is too close to the starting section of the volute 100, which would cause the airflow to form a large-angle impact at the leading edge of the volute tongue 200.

[0055] In some embodiments of this utility model, such as Figure 1 and Figure 3As shown, the centrifugal fan also includes an air outlet 500. The volute 100 has a second planar section 120 for forming the air outlet 500, the second planar section 120 being perpendicular to the first planar section 300.

[0056] In this embodiment, this structural design enhances the overall rigidity of the volute 100 and better resists vibrations caused by airflow impact when the centrifugal impeller 400 operates at high speed, thereby reducing noise generation. The first planar section 300 and the second planar section 120 are spaced apart and located on both sides of the air outlet 500, so that the airflow can maintain a stable flow direction after leaving the curved section of the volute 100, thus ensuring the stability of the air supply.

[0057] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the volute tongue 200 has a third planar section 220 for forming the edge of the air outlet 500. The third planar section 220 is perpendicular to the first planar section 300.

[0058] In this embodiment, the first planar segment 300 is located on the side of the third planar segment 220 away from the second planar segment 120. The second planar segment 120 and the third planar segment 220 are arranged parallel to each other to form an air outlet 500. Before leaving the air outlet 500, the airflow flows at a constant speed between the second planar segment 120 and the third planar segment 220 to avoid the occurrence of vortex phenomena caused by unstable airflow speed at the air outlet 500, thereby avoiding reduced airflow efficiency and excessive noise.

[0059] In some embodiments of this utility model, such as Figure 3 As shown, the ratio of the distance L1 between the second plane segment 120 and the third plane segment 220 to the distance L3 between the end of the volute 100 connected to the first plane segment 300 and the second plane segment 120 is 0.55 to 0.95.

[0060] In this embodiment, the lower limit of the ratio of the distance L1 between the second plane section 120 and the third plane section 220 to the distance between the end of the volute 100 connected to the first plane section 300 and the second plane section 120 is 0.55, which ensures the size of the air outlet 500 and reduces the vibration generated when the centrifugal impeller 400 is running at high speed.

[0061] The ratio of the distance L1 between the second plane section 120 and the third plane section 220 to the distance between the end of the volute 100 connected to the first plane section 300 and the second plane section 120 is capped at 0.95, to prevent the volute 100 from increasing in volume due to excessive expansion of the air outlet 500.

[0062] When the ratio is in the range of 0.55 to 0.95, the air outlet 500 forms a moderate contraction, which is beneficial to increase the air outlet speed and maintain airflow stability.

[0063] In some embodiments of this utility model, such as Figure 3 As shown, the volute tongue 200 also has a volute tongue portion 210 connected between the first planar section 300 and the third planar section 220. The volute tongue portion 210 is curved for guiding flow.

[0064] In some embodiments of this utility model, such as Figure 3 As shown, the volute tongue 210 is arc-shaped. The first planar section 300 and the third planar section 220 are both tangent to the volute tongue 210. The geometric characteristics of the tangent connection ensure that the entire surface of the volute tongue 200 has a continuous curvature change, so that the airflow will not have obvious abrupt changes in direction during the flow process from the first planar section 300 to the volute tongue 210 and then to the third planar section 220. This is conducive to maintaining the flow stability of the airflow, effectively avoiding the generation of local vortices, and thus reducing the energy loss of the airflow on the surface of the volute tongue 200.

[0065] In some embodiments of this utility model, such as Figure 3 As shown, the ratio between the radius R of the inner surface of the volute tongue 210 and the outer diameter D of the centrifugal impeller 400 is 0.05 to 0.07.

[0066] In this embodiment, when the ratio between the radius R of the inner surface of the volute tongue 210 and the outer diameter D of the centrifugal impeller 400 is less than 0.05, the excessively small radius of curvature will cause the airflow to turn sharply on the surface of the volute tongue 200, which can easily lead to boundary layer separation and generate noise.

[0067] When the ratio between the radius R of the inner surface of the volute tongue 210 and the outer diameter D of the centrifugal impeller 400 is greater than 0.07, the excessive curvature weakens the guiding effect of the volute tongue 200 on the airflow and reduces the pressure energy conversion efficiency.

[0068] Therefore, the ratio of the radius R of the inner surface of the volute tongue 210 to the outer diameter D of the centrifugal impeller 400 is preferably 0.058.

[0069] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the volute 100 also has an involute section 110, one end of which is connected to the first planar section 300, and the other end of which is connected to the second planar section 120.

[0070] In this embodiment, the involute section 110 reduces energy loss during airflow within the volute 100. Furthermore, the smooth connection between the starting end of the involute section 110 and the first planar section 300 eliminates flow separation points and reduces noise generated when airflow passes through the first planar section 300. The terminal end of the involute section 110 forms a tangential connection with the second planar section 120, improving the uniformity of velocity distribution at the air outlet 500 and making the airflow at the air outlet 500 more stable.

[0071] This utility model provides an air conditioner, which also includes the centrifugal fan in any of the above embodiments.

[0072] In this embodiment, the plane where the end of the volute 100 connected to the first planar section 300 and the center line of the centrifugal impeller 400 are located is perpendicular to the first planar section 300. That is, the first planar section 300 and the end of the volute 100 connected to the first planar section 300 are tangent.

[0073] When the airflow passes through the volute tongue 200, since the first plane section 300 is perpendicular to the reference plane, it not only reduces the power loss of the airflow when it passes through the volute tongue 200 and improves the air delivery efficiency of the centrifugal impeller 400, but also effectively reduces the impact force of the airflow hitting the volute tongue 200 under the push of the centrifugal impeller 400 when the airflow flows in the volute casing 100, and reduces the pulse pressure at the volute tongue 200, thereby reducing the noise generated at the volute tongue 200. This reduces the noise generated when the centrifugal fan is working, improves the sound quality of the air conditioner, and thus improves the user experience.

[0074] 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: Snail shell; A centrifugal impeller is disposed inside the volute casing; Cochlear tongue; The first planar section has one end connected to the volute tongue and the other end connected to the volute shell; the plane where the end of the volute shell connected to the first planar section is located and the center line of the centrifugal impeller are located is a reference plane, and the reference plane is perpendicular to the first planar section.

2. The centrifugal fan according to claim 1, characterized in that, The distance between the end of the volute connected to the first planar section and the centerline of the centrifugal impeller is less than the distance between other positions of the volute and the centerline of the centrifugal impeller.

3. The centrifugal fan according to claim 1, characterized in that, The ratio between the distance between the end of the volute connected to the first planar section and the centerline of the centrifugal impeller and the outer diameter of the centrifugal impeller is 0.08 to 0.

15.

4. The centrifugal fan according to claim 1, characterized in that, The intersection of the extended surface of the first planar section and the volute is a reference line; The ratio of the distance between the first planar segment and the reference line to the distance between the reference line and the end of the volute connected to the first planar segment is 0.58 to 0.

97.

5. The centrifugal fan according to claim 1, characterized in that, Also includes: Air vent; The volute has a second planar section for forming an air outlet, the second planar section being perpendicular to the first planar section.

6. The centrifugal fan according to claim 5, characterized in that, The volute tongue has a third planar section for forming the edge of the air outlet; The third plane segment is perpendicular to the first plane segment.

7. The centrifugal fan according to claim 6, characterized in that, The ratio of the distance between the second planar segment and the third planar segment to the distance between the end of the volute connected to the first planar segment and the second planar segment is 0.55 to 0.

95.

8. The centrifugal fan according to claim 6, characterized in that, The volute tongue also has a volute portion connecting the first planar segment and the third planar segment, and the volute tongue portion is curved; The cochlear tongue is arc-shaped, and both the first planar segment and the third planar segment are tangent to the cochlear tongue. The ratio between the radius of the inner surface of the volute tongue and the outer diameter of the centrifugal impeller is 0.05 to 0.

07.

9. The centrifugal fan according to claim 6, characterized in that, The volute also has an involute section, one end of which is connected to the first planar section, and the other end of which is connected to the second planar section.

10. An air conditioner, characterized in that, The centrifugal fan included in any one of claims 1 to 9.

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