Centrifugal fan and air conditioning apparatus

Abstract

The utility model relates to air conditioning equipment technical field, and want to solve the problem that the noise is produced due to the outlet size reduction of centrifugal fan. The utility model provides a centrifugal fan and air conditioning equipment, wherein, the centrifugal fan includes: the casing is provided with the air outlet, is provided with the air duct that communicates the air outlet in it, and is provided with the volute tongue that is adjacent to the air outlet on it;Centrifugal fan is set up in the air duct;The flow guide structure is set up on the inner wall surface of the air duct, and is set up opposite the volute tongue, and includes the inclined flow guide surface and the wind following flow guide surface that are connected, the inclined flow guide surface sets up to centrifugal fan, and the inclined flow guide surface is connected to the inner wall surface, the wind following flow guide surface sets up to volute tongue, the distance between the inclined flow guide surface and the air outlet is greater than the distance between the wind following flow guide surface and the air outlet. The utility model overcomes the technical problem.

Description

Technical Field

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

[0002] With the development of science and technology and the continuous improvement of people's living standards, the demand for air conditioning equipment in household, industrial, and other application fields is increasing. Furthermore, due to the high air pressure and excellent airflow performance of centrifugal fans, many air conditioning devices are equipped with centrifugal fans to regulate airflow.

[0003] Currently, in some existing technologies, centrifugal fan outlets in some air conditioning equipment require reduction in size for installation. However, this causes the airflow to flow towards the outlet within the duct, converging on the portion of the centrifugal fan casing around the outlet. This creates eddies, generating noise and further degrading the user experience. Utility Model Content

[0004] One objective of this invention is to provide a centrifugal fan and air conditioning equipment that can overcome at least one of the technical defects in the prior art.

[0005] A further objective of this invention is to suppress or even avoid noise generated by centrifugal fans due to the narrowing of the air outlet, thereby improving the user experience.

[0006] Specifically, this utility model provides a centrifugal fan, which includes:

[0007] The casing has an air outlet, an air duct inside that connects to the air outlet, and a volute tongue on the casing adjacent to the air outlet.

[0008] Centrifugal fan, installed inside the air duct;

[0009] The airflow guiding structure is set on the inner wall of the air duct and is positioned relative to the volute tongue. It includes an inclined airflow guiding surface and a downwind airflow guiding surface connected to each other. The inclined airflow guiding surface is positioned towards the centrifugal fan and is connected to the inner wall surface. The downwind airflow guiding surface is positioned towards the volute tongue. The distance between the inclined airflow guiding surface and the air outlet is greater than the distance between the downwind airflow guiding surface and the air outlet. The inclined airflow guiding surface is used to promote the airflow passing through it to flow away from the inner wall surface. The downwind airflow guiding surface is used to promote the airflow passing through the inclined airflow guiding surface to flow towards the air outlet.

[0010] Furthermore, the inclined guide surface includes a first inclined end connected to the inner wall surface and a second inclined end disposed opposite to the first inclined end, the second inclined end extending away from the inner wall surface and closer to the air outlet; and,

[0011] The windward guide surface includes a first windward end connected to the second inclined end and a second windward end extending toward the air outlet, with the first windward end and the second windward end arranged opposite to each other.

[0012] Furthermore, the angle between the inclined guide surface and the inner wall surface ranges from 30° to 70°; and,

[0013] The ratio of the distance between the downwind guide surface and the inner wall surface to the distance between the downwind guide surface and the volute tongue ranges from one-thirtieth to one-tenth; and,

[0014] The ratio of the length of the guide structure in the direction of the first and second downwind ends to the distance between the downwind guide surface and the inner wall surface ranges from 2 to 7.

[0015] Furthermore, the angle between the inclined guide surface and the inner wall surface ranges from 40° to 60°; and,

[0016] The ratio of the distance between the downwind guide surface and the inner wall surface to the distance between the downwind guide surface and the volute tongue ranges from one twenty-fifth to two twenty-fifths; and,

[0017] The ratio of the length of the guide structure in the direction of the first and second downwind ends to the distance between the downwind guide surface and the inner wall surface ranges from 3 to 5.

[0018] Furthermore, a receiving groove is embedded in the inner wall surface, located between the air guide structure and the air outlet; and,

[0019] Centrifugal fans include:

[0020] A shielding structure is rotatably disposed within a receiving groove, with its rotation axis positioned adjacent to the air outlet, for opening and closing at least a portion of the air outlet.

[0021] Furthermore, the flow guiding structure extends to the receiving trough, and the sum of the distance between the downwind flow guiding surface and the inner wall surface and the depth of the receiving trough is greater than the thickness of the shielding structure.

[0022] Furthermore, the housing includes a curved volute and a back plate and an air inlet plate respectively connected to both sides of the volute; and,

[0023] The flow guiding structure and the volute tongue are set on the volute plate, and the inner wall surface is located on the volute plate.

[0024] Furthermore, the air intake plate has a volute air intake with a connected ventilation duct; and,

[0025] The casing also includes:

[0026] An air inlet cover is mounted on the back plate, with the volute and air inlet plate located inside the air inlet cover. The air inlet cover has an air inlet, and an air inlet cavity is constructed between the air inlet cover and the air inlet plate, connecting the volute air inlet and the air inlet of the air inlet.

[0027] An air inlet cover is installed on the outer periphery of the volute plate. The air inlet cover is provided with a side air inlet, and a side air inlet cavity is constructed between the air inlet cover and the volute plate, which is connected to the side air inlet. The side air inlet cavity and the air inlet cavity of the cover are connected through a connecting port.

[0028] Furthermore, the air inlet of the outer casing and the air inlet of the volute are arranged opposite each other; and,

[0029] At least a portion of the side air inlet and at least a portion of the connecting port are arranged opposite each other.

[0030] In particular, this utility model also provides an air conditioning device, which includes the centrifugal fan described above.

[0031] This centrifugal fan, due to the inclusion of a guide structure positioned relative to the volute, comprises an inclined guide surface and a downstream guide surface connected together. The inclined guide surface faces the centrifugal fan and is connected to the inner wall surface, while the downstream guide surface faces the volute. The distance between the inclined guide surface and the air outlet is greater than the distance between the downstream guide surface and the air outlet. Consequently, under the action of the guide structure, the airflow is first directed by the inclined guide surface to flow away from the inner wall surface, and then directed by the downstream guide surface to flow towards the air outlet. This adapts to the narrowed or reduced-size air outlet, allowing the airflow to flow directly to the outlet. This suppresses or even prevents the airflow from flowing towards the casing around the outlet, thus suppressing or preventing the formation of eddies after the airflow reaches the casing. Therefore, this invention can suppress or even prevent noise generated by the narrowed air outlet of the centrifugal fan, improving the user experience.

[0032] The air conditioning device of this utility model includes the aforementioned centrifugal fan, and thus also possesses the beneficial technical effects that the aforementioned centrifugal fan can have.

[0033] 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

[0034] 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:

[0035] Figure 1 This is one of the structural schematic diagrams of a centrifugal fan according to an embodiment of the present invention;

[0036] Figure 2 This is one of the internal structural schematic diagrams of a centrifugal fan according to an embodiment of the present invention;

[0037] Figure 3 This is a second schematic diagram of the internal structure of a centrifugal fan according to an embodiment of the present invention;

[0038] Figure 4 yes Figure 3 Enlarged diagram of section "A" in the image;

[0039] Figure 5 This is an exploded schematic diagram of a centrifugal fan according to an embodiment of the present invention;

[0040] Figure 6 This is a second schematic diagram of the structure of a centrifugal fan according to an embodiment of the present invention;

[0041] Figure 7 yes Figure 6 Enlarged diagram of section "B" in the image;

[0042] Figure 8 This is the third schematic diagram of the internal structure of a centrifugal fan according to an embodiment of the present invention;

[0043] Figure 9 This is a schematic diagram of the structure of an indoor unit of a duct-type air conditioner in an air conditioning device according to an embodiment of the present invention. Detailed Implementation

[0044] In the description of this embodiment, it should be understood that the terms "length", "thickness", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention 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 limiting the present invention.

[0045] 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 technical features indicated. 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 this 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 stated, this indicates that other features are not excluded and may be further included.

[0046] Unless otherwise expressly specified and limited, the terms "installation," "setup," and "connection" 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 invention based on the specific circumstances.

[0047] 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.

[0048] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of these embodiments have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0049] In the description of this embodiment, the references to terms such as "this embodiment," "some other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0050] The following is combined Figures 1 to 8 The centrifugal fan of this embodiment will be described in detail below. Among them, Figure 1 and Figure 2 These are schematic diagrams from the same perspective, and Figure 2 exist Figure 1 The back panel 150 was removed from the base design; Figure 6 and Figure 8 These are schematic diagrams from the same perspective, and Figure 8 exist Figure 6 The air intake cover 170 has been removed from the original design.

[0051] In this embodiment, the centrifugal fan can generate centrifugal force through the high-speed rotation of the centrifugal fan 200, so that air enters the centrifugal fan from the axial inlet (e.g., the volute inlet 161 and the outer casing inlet 171 in the following embodiment), and under the action of the rotation of the centrifugal fan 200, in conjunction with the volute of a specific shape, it leaves the centrifugal fan 200 radially and is discharged from the outlet 110 of the centrifugal fan.

[0052] Reference Figure 1 , Figure 2 and Figure 3 In this embodiment, the centrifugal fan may include a casing 100, a centrifugal fan 200, and a flow guiding structure 300.

[0053] An air outlet 110 is provided on the housing 100, an air duct 120 is provided inside the housing 100 to connect with the air outlet 110, and a volute tongue 130 is provided on the housing 100 adjacent to the air outlet 110.

[0054] Centrifugal fan 200 is installed inside air duct 120.

[0055] The flow guiding structure 300 is disposed on the inner wall surface 121 of the air duct 120 and is disposed relative to the volute tongue 130. The flow guiding structure 300 includes an inclined flow guiding surface 310 and a windward flow guiding surface 320 connected to each other. The inclined flow guiding surface 310 is disposed towards the centrifugal fan 200 and is connected to the inner wall surface 121. The windward flow guiding surface 320 is disposed towards the volute tongue 130. The distance C between the inclined flow guiding surface 310 and the air outlet 110 is greater than the distance D between the windward flow guiding surface 320 and the air outlet 110. The inclined flow guiding surface 310 is used to promote the airflow passing through it to flow away from the inner wall surface 121. The windward flow guiding surface 320 is used to promote the airflow passing through the inclined flow guiding surface 310 to flow towards the air outlet 110.

[0056] Since the centrifugal fan in this embodiment includes a guide structure 300 arranged relative to the volute tongue 130, and the guide structure 300 includes an inclined guide surface 310 and a windward guide surface 320 connected to each other, the inclined guide surface 310 is arranged towards the centrifugal fan 200 and is connected to the inner wall surface 121, the windward guide surface 320 is arranged towards the volute tongue 130, and the distance C between the inclined guide surface 310 and the air outlet 110 is greater than the distance D between the windward guide surface 320 and the air outlet 110. Furthermore, under the action of the guide structure 300, the outlet airflow can first be configured by the inclined guide surface 310 to flow away from the inner wall surface 121, and then configured by the downwind guide surface 320 to flow towards the outlet 110, adapting to the narrowed outlet 110, so that the outlet airflow flows directly to the outlet 110, suppressing or even preventing the outlet airflow from flowing towards the casing 100 around the outlet 110, and suppressing or even preventing the generation of vortices after the outlet airflow flows towards the casing 100 around the outlet 110. Therefore, this embodiment can suppress or even prevent the noise generated by the centrifugal fan due to the narrowing of the outlet 110, improving the user experience.

[0057] Furthermore, the airflow guiding structure 300 can change the flow direction of the airflow through the inclined airflow guiding surface 310 and the windward airflow guiding surface 320, so as to suppress or even avoid the generation of vortices in the airflow after it flows to the casing 100 located around the air outlet 110, thereby suppressing or even avoiding wind loss in the airflow at that location and ensuring the flow rate of the airflow.

[0058] Reference Figure 4 In this embodiment, the inclined guide surface 310 includes a first inclined end 311 connected to the inner wall surface 121 and a second inclined end 312 disposed opposite to the first inclined end 311. The second inclined end 312 extends in a direction away from the inner wall surface 121 and close to the air outlet 110.

[0059] The windward guide surface 320 includes a first windward end 321 connected to the second inclined end 312 and a second windward end 322 extending toward the air outlet 110, with the first windward end 321 and the second windward end 322 arranged opposite to each other.

[0060] It is understood that the first inclined end 311 is connected to the inner wall surface 121, and the second inclined end 312 extends away from the inner wall surface 121 and closer to the air outlet 110. Thus, the inclined guide surface 310 can be inclined towards the centrifugal fan 200 to cause the airflow passing through it to flow away from the inner wall surface 121. The first downstream end 321 is connected to the second inclined end 312, and the second downstream end 322 extends towards the air outlet 110, so that the downstream guide surface 320 is positioned towards the volute tongue 130, and causes the airflow passing through the inclined guide surface 310 to flow towards the air outlet 110.

[0061] Reference Figure 4 In this embodiment, an arc-shaped surface 330 is provided between the inclined guide surface 310 and the downwind guide surface 320 to ensure the smooth flow of the airflow from the inclined guide surface 310 to the downwind guide surface 320.

[0062] In this embodiment, the flow guiding structure 300 and the inner wall surface 121 can be an integral structure.

[0063] In some other embodiments, the flow guiding structure 300 and the inner wall surface 121 may be detachably connected.

[0064] Reference Figure 4 In this embodiment, the included angle α between the inclined guide surface 310 and the inner wall surface 121 ranges from 30° to 70°.

[0065] It is understandable that the angle α between the inclined guide surface 310 and the inner wall surface 121 is configured to be between 30° and 70°, which can ensure that the airflow deviates from the inner wall surface 121 while promoting the airflow to flow towards the air outlet 110.

[0066] Reference Figure 4 In this embodiment, the included angle α between the inclined guide surface 310 and the inner wall surface 121 is in the range of 40° to 60°, so as to further ensure the fluidity of the airflow flowing towards the air outlet 110 and the effect of flowing away from the inner wall surface 121.

[0067] Reference Figure 3 and Figure 4 In this embodiment, the ratio of the distance F between the windward guide surface 320 and the inner wall surface 121 to the distance E between the windward guide surface 320 and the volute tongue 130 ranges from one-thirtieth to one-tenth.

[0068] It is understood that the limitation of the distance F between the windward guide surface 320 and the inner wall surface 121 and the distance E between the windward guide surface 320 and the volute tongue 130 in this embodiment specifically limits the proportion of the air duct 120 occupied by the guide structure 300, so as to ensure that the guide structure 300 can play a guiding role for the airflow and avoid the guide structure 300 from restricting the flow of the airflow to the air outlet 110.

[0069] Reference Figure 3 and Figure 4 In this embodiment, the ratio of the distance F between the windward guide surface 320 and the inner wall surface 121 to the distance E between the windward guide surface 320 and the volute tongue 130 is between one-twenty-fifth and two-twenty-fifths, so as to further ensure the guiding effect of the guide structure 300 on the airflow and further avoid the restriction of the airflow from the guide structure 300 to the air outlet 110.

[0070] Reference Figure 4 In this embodiment, the ratio of the length L of the guide structure 300 in the direction where the first downwind end 321 and the second downwind end 322 are located to the distance F between the downwind guide surface 320 and the inner wall surface 121 is in the range of 2 to 7.

[0071] Understandably, when the angle α between the inclined guide surface 310 and the inner wall surface 121, and the distance F between the downwind guide surface 320 and the inner wall surface 121 are limited, the length L of the guide structure 300 in the direction where the first downwind end 321 and the second downwind end 322 are located can be limited, thereby limiting the length of the downwind guide surface 320 between the first downwind end 321 and the second downwind end 322. Therefore, the ratio of the length L of the guide structure 300 in the direction where the first downwind end 321 and the second downwind end 322 are located to the distance F between the downwind guide surface 320 and the inner wall surface 121 is in the range of 2 to 7. This ensures the guiding effect of the downwind guide surface 320 on the airflow passing through the inclined guide surface 310, while avoiding the guide structure 300 from being too large and consuming unnecessary materials.

[0072] Reference Figure 4 In this embodiment, the ratio of the length L of the guide structure 300 in the direction where the first windward end 321 and the second windward end 322 are located to the distance F between the windward guide surface 320 and the inner wall surface 121 is in the range of 3 to 5, so as to further save the amount of construction material of the guide structure 300 while ensuring the guiding effect of the windward guide surface 320 on the airflow passing through the inclined guide surface 310.

[0073] Reference Figure 2 , Figure 3 and Figure 4 In this embodiment, an accommodating groove 1211 is embedded in the inner wall surface 121 between the flow guiding structure 300 and the air outlet 110; and the centrifugal fan may also include a shielding structure 400.

[0074] The shielding structure 400 is rotatably disposed in the receiving groove 1211, and the rotation shaft 410 of the shielding structure 400 is disposed adjacent to the air outlet 110. The shielding structure 400 is used to open and close at least part of the air outlet 110.

[0075] It is understood that the obstruction structure 400 can open and close part of the air outlet 110. In some embodiments, the obstruction structure 400 can block the airflow within the air duct 120 from flowing out of the air outlet 110 to facilitate other forms of airflow patterns. In other embodiments, the obstruction structure 400 can be configured as a filter structure, which can filter the airflow flowing out of the air outlet 110 when the obstruction structure 400 is in a state of closing at least part of the air outlet 110, thereby improving the user experience.

[0076] Furthermore, with the obstruction structure 400 enclosing the air outlet 110, the receiving groove 1211 lacks an obstruction structure 400. Without the guidance structure 300, the airflow can easily generate eddies in the space of the receiving groove 1211, leading to noise and wind damage. In other words, under the guidance of the inclined guidance surface 310 and the following guidance surface 320, the airflow can first be directed by the inclined guidance surface 310 to flow away from the inner wall surface 121, and then by the following guidance surface 320 to flow towards the corresponding air outlet 110, avoiding the generation of eddies in the receiving groove 1211 and further improving the user experience.

[0077] Reference Figure 4 In this embodiment, the flow guiding structure 300 extends to the receiving groove 1211, and the sum of the distance F between the downwind flow guiding surface 320 and the inner wall surface 121 and the depth G of the receiving groove 1211 is greater than the thickness H of the shielding structure 400.

[0078] It is understandable that by configuring the sum of the distance F between the windward guide surface 320 and the inner wall surface 121 and the depth G of the receiving groove 1211 to be greater than the thickness H of the shielding structure 400, the shielding structure 400 can be completely shielded by the groove wall of the receiving groove 1211 and the guide structure 300 when at least part of the air outlet 110 is open. This prevents the shielding structure 400 from extending out of the receiving groove 1211 and blocking the flow path of the air outlet, thus restricting the flow of the air outlet and preventing any loss of air pressure, thereby further ensuring the flow rate of the air outlet.

[0079] Reference Figure 1 , Figure 2 and Figure 5 In this embodiment, the housing 100 includes a curved volute 140 and a back plate 150 and an air inlet plate 160 respectively connected to both sides of the volute 140. Furthermore,

[0080] The flow guiding structure 300 and the volute tongue 130 are disposed on the volute plate 140, and the inner wall surface 121 is located on the volute plate 140.

[0081] It is understandable that the volute 140, back plate 150 and air inlet plate 160 can form a volute and air duct 120, and the air guide structure 300 and volute tongue 130 are set on the volute 140.

[0082] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In this embodiment, the air inlet plate 160 is provided with a volute air inlet 161 connected to the ventilation duct 120; and the housing 100 also includes an air inlet cover 170.

[0083] An air inlet cover 170 is mounted on the back plate 150, and the volute 140 and the air inlet plate 160 are located inside the air inlet cover 170 (air inlet cavity 172). The air inlet cover 170 is provided with an air inlet 171, and an air inlet cavity 172 is constructed between the air inlet cover 170 and the air inlet plate 160, connecting the volute air inlet 161 and the air inlet 171. Furthermore,

[0084] An air inlet cover 170 is installed on the outer periphery of the volute plate 140. The air inlet cover 170 is provided with a side air inlet 173, and a side air inlet cavity 174 is constructed between the air inlet cover 170 and the volute plate 140, which communicates with the side air inlet 173. The side air inlet cavity 174 and the air inlet cavity 172 of the cover are connected through a connecting port 175.

[0085] It is understood that the configuration of the air inlet cover 170 in this embodiment can create an air inlet cavity 172 and a side air inlet cavity 174. Air can then enter the air duct 120 from the air inlet cavity 172 and / or the side air inlet cavity 174. This allows the centrifugal fan to achieve multiple air intake modes or configure multiple airflows (e.g., indoor airflow or outdoor fresh airflow) into the centrifugal fan. Therefore, the air conditioning device with the centrifugal fan of this embodiment can achieve multiple air intake and / or air outlet modes.

[0086] In addition, an air inlet grille 176 is provided at the air inlet 171 of the outer cover to ensure the cleanliness of the airflow entering the centrifugal fan, thereby ensuring the service life of the centrifugal fan and the user's experience.

[0087] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, air outside the centrifugal fan can flow sequentially through the outer casing air inlet 171, the outer casing air inlet cavity 172, and the volute air inlet 161 into the air duct 120.

[0088] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In other embodiments, air outside the centrifugal fan can flow sequentially through the side air inlet 173, the side air inlet cavity 174, the connecting port 175, the outer cover air inlet cavity 172, and the volute air inlet 161 into the air duct 120.

[0089] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some other embodiments, the lateral air inlet 174 can be connected to the position of the adjacent air outlet 110 of the air duct 120, so that the air outside the centrifugal fan can flow sequentially through the lateral air inlet 173, the lateral air inlet 174, enter the part of the air duct 120 of the adjacent air outlet 110, and flow out of the centrifugal fan from the air outlet 110 through the air duct 120.

[0090] Reference Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In this embodiment, the outer casing air inlet 171 and the volute air inlet 161 are arranged opposite to each other to ensure the fluidity of the airflow from the outer casing air inlet 171 to the volute air inlet 161.

[0091] Reference Figure 1 , Figure 2 , Figure 3 and Figure 5 In this embodiment, at least a portion of the side air inlet 173 and at least a portion of the connecting port 175 are arranged opposite each other to ensure the fluidity of the airflow from the side air inlet 173 to the connecting port 175.

[0092] Reference Figure 2 In this embodiment, the air duct 120 may include a volute 122 for accommodating the centrifugal fan 200 and an air outlet duct 123 arranged around the volute 122. The air outlet duct 123 is located on the air outlet side of the centrifugal fan 200 and connects the air outlet 110 and the volute 122. The volute inlet 161 is connected to the volute 122. The air guide structure 300 is located within the air outlet duct 123.

[0093] The air conditioning device of this embodiment will now be described in detail.

[0094] In this embodiment, since the air conditioning device includes the centrifugal fan of the above embodiment, the air conditioning device of this utility model also possesses the beneficial technical effects that the centrifugal fan of the above embodiment can have, and will not be described again here.

[0095] In this embodiment, the air conditioning device can be an indoor air conditioning unit (e.g., a ducted air conditioning indoor unit, such as...). Figure 9 As shown, other examples include standing air conditioner indoor units, wall-mounted air conditioner indoor units, window air conditioners, dehumidifiers, and fresh air systems.

[0096] 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: The housing has an air outlet, an air duct connected to the air outlet is provided inside, and a volute adjacent to the air outlet is provided on it. A centrifugal fan is installed inside the air duct; A flow guiding structure is disposed on the inner wall of the air duct and relative to the volute tongue. It includes an inclined flow guiding surface and a following flow guiding surface connected together. The inclined flow guiding surface is disposed towards the centrifugal fan and is connected to the inner wall surface. The following flow guiding surface is disposed towards the volute tongue. The distance between the inclined flow guiding surface and the air outlet is greater than the distance between the following flow guiding surface and the air outlet. The inclined flow guiding surface is used to cause the airflow passing through it to flow away from the inner wall surface. The following flow guiding surface is used to cause the airflow passing through the inclined flow guiding surface to flow towards the air outlet.

2. The centrifugal fan according to claim 1, characterized in that, The inclined airflow guide surface includes a first inclined end connected to the inner wall surface and a second inclined end disposed opposite to the first inclined end, the second inclined end extending in a direction away from the inner wall surface and close to the air outlet; and... The windward guide surface includes a first windward end connected to the second inclined end and a second windward end extending toward the air outlet, with the first windward end and the second windward end arranged opposite to each other.

3. The centrifugal fan according to claim 2, characterized in that, The angle between the inclined guide surface and the inner wall surface ranges from 30° to 70°; and... The ratio of the distance between the windward guide surface and the inner wall surface to the distance between the windward guide surface and the volute tongue is in the range of one-thirtieth to one-tenth; and, The ratio of the length of the guide structure in the direction where the first and second downwind ends are located to the distance between the downwind guide surface and the inner wall surface ranges from 2 to 7.

4. The centrifugal fan according to claim 2, characterized in that, The angle between the inclined guide surface and the inner wall surface ranges from 40° to 60°; and... The ratio of the distance between the windward guide surface and the inner wall surface to the distance between the windward guide surface and the volute tongue is in the range of one-twenty-fifth to two-twenty-fifths; and, The ratio of the length of the guide structure in the direction where the first and second downwind ends are located to the distance between the downwind guide surface and the inner wall surface ranges from 3 to 5.

5. The centrifugal fan according to claim 1, characterized in that, An accommodating groove is embedded in the inner wall surface between the air guiding structure and the air outlet; and... The centrifugal fan includes: A shielding structure is rotatably disposed within the receiving groove, and its rotation axis is disposed adjacent to the air outlet, for opening and closing at least a portion of the air outlet.

6. The centrifugal fan according to claim 5, characterized in that, The flow guiding structure extends to the receiving groove, and the sum of the distance between the downwind flow guiding surface and the inner wall surface and the depth of the receiving groove is greater than the thickness of the shielding structure.

7. The centrifugal fan according to claim 1, characterized in that, The housing includes a curved volute plate and a back plate and an air inlet plate respectively connected to both sides of the volute plate; and... The flow guiding structure and the volute tongue are disposed on the volute plate, and the inner wall surface is located on the volute plate.

8. The centrifugal fan according to claim 7, characterized in that, The air inlet plate has a volute air inlet that connects to the air duct; and... The housing also includes: An air inlet cover is fitted onto the back plate, and the volute and the air inlet plate are located inside the air inlet cover. The air inlet cover has an air inlet port, and an air inlet cavity is constructed between the air inlet cover and the air inlet plate, connecting the volute air inlet port and the air inlet port. The air inlet cover is disposed on the outer periphery of the volute plate. The air inlet cover is provided with a side air inlet, and a side air inlet cavity is constructed between the air inlet cover and the volute plate, which communicates with the side air inlet. The side air inlet cavity and the air inlet cavity of the cover are connected through a communication port.

9. The centrifugal fan according to claim 8, characterized in that, The air inlet of the outer casing and the air inlet of the volute are arranged opposite to each other; and... At least a portion of the lateral air inlet and at least a portion of the connecting port are arranged opposite each other.

10. An air conditioning device, characterized in that, Including the centrifugal fan according to any one of claims 1 to 9.

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