Air duct system and dryer

Abstract

This application relates to an air duct device and a clothes dryer. The air duct device includes at least two sets of air duct components. Each set of air duct components includes an air duct shell and a centrifugal impeller. An air outlet is formed on the air duct shell. The centrifugal impeller is disposed inside the air duct shell and configured to form an airflow flowing towards the air outlet. The aforementioned air duct device, having at least two sets of air duct components, each of which can generate an airflow with a high outlet velocity and strong resistance through centrifugal impeller drive, and blown out from its respective air outlet, can effectively reduce the concentration of the airflow, dry clothes more evenly, and improve drying effect and efficiency. Furthermore, the arrangement of at least two sets of air duct components also helps to increase the airflow range of the air duct device, enabling it to dry a larger number of garments simultaneously.

Description

Technical Field

[0001] This application relates to the field of clothes drying equipment technology, and in particular to an air duct device and a clothes dryer. Background Technology

[0002] As the current economic level continues to improve, users have higher and higher demands for efficient and high-quality healthy living. Clothes dryers are receiving increasing attention because they can shorten drying time and reduce the impact of weather, especially humid weather, on drying clothes.

[0003] In the current market, dryers have an air outlet in the center or on one side. During operation, the dryer delivers hot air through the air outlet. When the hot air blows directly onto the surface of the clothes to dry them, the airflow is concentrated due to the limited structure of the air outlet, resulting in uneven drying and affecting the drying effect and efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide an air duct device and dryer that can deliver air and dry clothes more evenly to address the above problems.

[0005] A duct device includes at least two sets of duct components, each set of duct components including a duct shell and a centrifugal impeller, wherein an air outlet is formed on the duct shell; the centrifugal impeller is disposed inside the duct shell and configured to form a supply airflow toward the air outlet.

[0006] In one embodiment, the air duct device includes a first air duct assembly and a second air duct assembly. The first air duct assembly includes a first air duct shell and a first centrifugal impeller. The first air duct shell forms a first air outlet, and the first centrifugal impeller is disposed inside the first air duct shell.

[0007] The second air duct assembly includes a second air duct shell and a second centrifugal impeller. The second air duct shell forms a second air outlet, which is spaced apart from the first air outlet. The second centrifugal impeller is disposed inside the second air duct shell.

[0008] In one embodiment, each of the air duct shells includes a volute portion and an air duct portion that are connected to each other. The centrifugal impeller is disposed in the volute portion of the air duct shell, and the air duct portion forms the air outlet. The volute profile of the volute portion is a spiral or an arc formed by a combination of base circles of different radii.

[0009] In one embodiment, the gap between the volute tongue of the volute and the centrifugal impeller is A, and the diameter of the centrifugal impeller is D, then D / 28≤A≤D / 10.

[0010] In one embodiment, the axis passing through the center of the centrifugal impeller and perpendicular to the horizontal plane is the central axis Z of the centrifugal impeller;

[0011] The angle formed by the line connecting the volute tongue of the first air duct shell to the axis of the first centrifugal impeller and the central axis Z of the first centrifugal impeller is the phase angle θ1 of the volute tongue of the first air duct shell, then 30°≤θ1≤90°; and / or, the angle formed by the line connecting the volute tongue of the second air duct shell to the axis of the second centrifugal impeller and the central axis Z of the second centrifugal impeller is the phase angle θ2 of the volute tongue of the second air duct shell, then -90°≤θ2≤-30°.

[0012] In one embodiment, the first centrifugal impeller and the second centrifugal impeller are configured to rotate coaxially and in the same direction, and the volute portions of the first air duct shell and the second air duct shell are arranged in opposite directions.

[0013] In one embodiment, the openings of the first air outlet and the second air outlet face the same direction.

[0014] In one embodiment, the air duct section includes an outlet section and a guide section, the outlet section is used to form an air outlet, and the guide section is connected between the volute section and the outlet section.

[0015] In one embodiment, the length of the air guide section is L, and the diameter of the centrifugal impeller is D, then D / 2≤L≤3D / 2.

[0016] In one embodiment, each group of the air duct assembly further includes a heating device disposed within the air guide section and arranged parallel to the axial direction of the centrifugal impeller.

[0017] If the horizontal distance between the heating device and the centrifugal fan is C, then 2D / 3≤C≤2D.

[0018] In one embodiment, the first centrifugal impeller and the second centrifugal impeller are arranged longitudinally along the same axis and spaced apart from each other;

[0019] The air duct device also includes a dual-axis motor with two output shafts. The dual-axis motor is located between the first centrifugal impeller and the second centrifugal impeller, and is connected to the first centrifugal impeller and the second centrifugal impeller respectively through the two output shafts.

[0020] In one embodiment, the air duct device further includes a motor support, through which the dual-axis motor is mounted between the first centrifugal impeller and the second centrifugal impeller.

[0021] In one embodiment, the air duct device further includes a base, the base including a first base and a second base, the first air duct shell being disposed inside the first base and forming the first air outlet on the outer surface of the first base; the second air duct shell being disposed inside the second base and forming the second air outlet on the outer surface of the second base.

[0022] In one embodiment, the width of the air outlet in the first direction is b, and the diameter of the centrifugal impeller is D, then D / 2≤b≤D, wherein the first direction is perpendicular to the axial direction of the centrifugal impeller.

[0023] A clothes dryer includes the aforementioned air duct device.

[0024] The aforementioned air duct device and dryer have at least two sets of air duct components. Each set of air duct components can generate an airflow with a high outlet velocity and strong resistance through a centrifugal impeller, and blow it out from its respective air outlet. This can effectively reduce the concentration of the air supply, dry clothes more evenly, and improve the drying effect and efficiency. In addition, the arrangement of at least two sets of air duct components also helps to increase the air supply range of the air duct device, enabling it to dry a larger number of clothes at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the air duct device in one embodiment of this application.

[0027] Figure 2 for Figure 1 The diagram shows the airflow during the operation of the ductwork device.

[0028] Figure 3 for Figure 1 The diagram shows the structure of the folded air duct device.

[0029] Figure 4 for Figure 1 The diagram shows the exploded structure of the air duct device.

[0030] Figure 5 for Figure 1 A schematic cross-sectional view of the first air duct component in the air duct device shown.

[0031] Figure 6 for Figure 1A schematic cross-sectional view of the second air duct component in the air duct device shown.

[0032] Figure 7 for Figure 1 The diagram shows a partial structural schematic of the air duct device.

[0033] Figure 8 for Figure 1 A cross-sectional schematic diagram of a portion of the structure of the air duct device shown.

[0034] Explanation of reference numerals in the attached drawings: 100, air duct device; 11, first air duct shell; 111, first air outlet; 13, second air duct shell; 131, second air outlet; 15, volute; 151, volute tongue; 17, air duct section; 171, outlet section; 173, air guide section; 175, connecting section; 31, first centrifugal impeller; 33, second centrifugal impeller; 50, heating device; 71, dual-shaft motor; 711, output shaft; 73, motor support; 91, first base; 93, second base; 95, bottom air inlet grille; 97, side air inlet grille. Detailed Implementation

[0035] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," 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 can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] Please see Figures 1 to 4One embodiment of this application provides a duct device 100, which includes at least two sets of duct components. Each set of duct components includes a duct shell and a centrifugal impeller. An air outlet is formed on the duct shell. The centrifugal impeller is disposed inside the duct shell and configured to form a supply airflow toward the air outlet.

[0042] All centrifugal impellers in the duct assembly can be driven independently or synchronously. After being driven, the centrifugal impellers rotate around their own axis and, constrained by the duct housing, generate airflow toward the outlet.

[0043] In one embodiment, the air duct device 100 can be used in a clothes dryer to generate an airflow that blows out from the air outlet and is directed toward the clothes to dry them.

[0044] The aforementioned air duct device 100 has at least two sets of air duct components. Each set of air duct components can generate an airflow with a high outlet velocity and strong resistance through a centrifugal impeller, and blow it out from its respective air outlet. This can effectively reduce the concentration of the air supply, dry clothes more evenly, and improve the drying effect and efficiency. In addition, the arrangement of at least two sets of air duct components also helps to increase the air supply range of the air duct device 100, enabling it to dry a larger number of clothes at the same time.

[0045] Furthermore, the air duct device 100 includes a first air duct assembly and a second air duct assembly. The first air duct assembly includes a first air duct shell 11 and a first centrifugal impeller 31. The first air duct shell 11 forms a first air outlet 111, and the first centrifugal impeller 31 is disposed within the first air duct shell 11 to generate an airflow toward the first air outlet 111. The second air duct assembly includes a second air duct shell 13 and a second centrifugal impeller 33. The second air duct shell 13 forms a second air outlet 131, which is spaced apart from the first air outlet 111. The second centrifugal impeller 33 is disposed within the second air duct shell 13 to generate an airflow toward the second air outlet 131.

[0046] The air duct device 100 includes two sets of air duct components, namely the first air duct component and the second air duct component, and the air outlets formed by the two are spaced apart to form double-sided air outlets, so that the drying airflow is delivered to the clothes from both sides, making the clothes more evenly wrapped. This effectively improves the problems of concentrated air supply and uneven drying caused by the single air duct arrangement of existing dryers, resulting in low drying efficiency.

[0047] In some embodiments, the air duct device 100 further includes a base, which includes a first base 91 and a second base 93. A first air duct shell 11 is disposed inside the first base 91 and a first air outlet 111 is formed on the outer surface of the first base 91. A second air duct shell 13 is disposed inside the second base 93 and a second air outlet 131 is formed on the outer surface of the second base 93.

[0048] Understandably, the base also has a bottom air intake grille 95 and / or a side air intake grille 97 to allow air to enter the air duct assembly and form a continuous airflow.

[0049] Furthermore, the first base 91 and the second base 93 are rotatably connected to each other, and both have an unfolded state and a folded state. The first air outlet 111 and the second air outlet 131 are located on both sides of the rotating shaft, respectively.

[0050] In this way, by folding the first base 91 and the second base 93, the space occupied by the air duct device 100 can be reduced, making it easier to transport, store or place.

[0051] Preferably, the first centrifugal impeller 31 and the second centrifugal impeller 33 are arranged coaxially, and the axes of both are located on the rotation axis of the first base 91 and the second base 93, and the side air inlet grilles 97 are formed at both ends of the base located on the rotation axis.

[0052] In some embodiments, the air duct assembly further includes a heating device 50 disposed within the air duct housing.

[0053] The airflow generated by the centrifugal fan flows through the heating device 50 during the air delivery process and is heated by the heating device 50, thereby realizing the function of accelerating the evaporation and drying of wet clothes.

[0054] Please refer to the following: Figure 5 and Figure 6 In some embodiments, the air duct housing includes a volute portion 15 and an air duct portion 17 that are connected to each other. The centrifugal impeller is disposed in the volute portion 15 of the air duct housing, and the air duct portion 17 forms an air outlet. The volute profile of the volute portion 15 is a spiral or an arc formed by a combination of base circles of different radii.

[0055] Both the first air duct shell 11 and the second air duct shell 13 include a volute portion 15 and an air duct portion 17 that are connected to each other. The first centrifugal impeller 31 and the second centrifugal impeller 33 are respectively disposed in the volute portion 15 of the first air duct shell 11 and the second air duct shell 13.

[0056] The volute 15 can cooperate with the centrifugal impeller to generate an airflow that blows toward the air duct 17, and is further guided by the air duct 17 to the air outlet.

[0057] In some embodiments, the gap between the volute tongue 151 of the volute portion 15 and the centrifugal impeller is A, and the diameter of the centrifugal impeller is D, then D / 28≤A≤D / 10.

[0058] Taking the spiral line of the volute as an example, the starting point of the spiral line, namely the arc segment of the minimum clearance between the volute part 15 and the centrifugal impeller, is the volute tongue 151. The diameter of the centrifugal impeller refers to its outer diameter.

[0059] The ratio of the gap A between the volute 151 and the centrifugal impeller to the diameter D of the centrifugal impeller has a significant impact on flow rate and efficiency, and also has a certain influence on the pressure inside the duct housing. When the gap A between the volute 151 and the centrifugal impeller is large, the centrifugal impeller head decreases, and the flow rate decreases. When the gap A between the volute 151 and the centrifugal impeller is small, the head increases, and the flow rate increases, but the noise peak and sound quality also deteriorate, and it will negatively affect the subsequent assembly of the duct housing and the installation of the centrifugal impeller. Therefore, limiting the relationship between the two to D / 28 ≤ A ≤ D / 10 helps to meet the head and flow rate requirements while taking into account the needs of noise, sound quality, assembly, and installation.

[0060] In some embodiments, the axis passing through the center of the centrifugal impeller and perpendicular to the horizontal plane is the central axis Z of the centrifugal impeller. The angle formed by the line connecting the volute tongue 151 of the first air duct housing 11 and the axis of the first centrifugal impeller 31 with the central axis Z of the first centrifugal impeller 31 is the phase angle θ1 of the volute tongue 151 of the first air duct housing 11, and 30°≤θ1≤90°.

[0061] With the central axis Z of the first centrifugal impeller 31 as the reference, the volute tongue 151 of the first duct housing 11 is arranged in a clockwise positive angle distribution. The phase angle of the volute tongue 151 is the main control parameter for the air-cutting angle of the duct housing. If this dimension is too small, the distance between the volute tongue 151 and the lower wall of the duct housing will decrease, increasing its outlet resistance in the volute section 15 and increasing wall reflection noise. If this dimension is too large, it will increase the near-wall vortex area, thereby increasing airflow loss and increasing vortex noise in the near-wall region. Therefore, to ensure smooth airflow of the first duct assembly and reduce aerodynamic noise, the phase angle θ1 of its volute tongue 151 should preferably be between 30° and 90°.

[0062] In some embodiments, the angle formed by the line connecting the volute tongue 151 of the second air duct shell 13 and the axis of the second centrifugal impeller 33 with the central axis Z of the second centrifugal impeller 33 is the phase angle θ2 of the volute tongue 151 of the second air duct shell 13, then -30°≤θ2≤-90°.

[0063] With the central axis Z of the second centrifugal impeller 33 as the reference, the volute tongue 151 of the second air duct shell 13 is set in a counterclockwise negative angle distribution. For similar purposes as mentioned above, the phase angle θ2 of the volute tongue 151 should preferably be between 30° and 90°.

[0064] The absolute values ​​of θ1 and θ2 can be the same. Under the premise that the first centrifugal impeller 31 and the second centrifugal impeller 33 can rotate coaxially and in the same direction, the first air duct shell 11 and the second air duct shell 13 can be arranged opposite each other, forming air supply on different sides, so as to achieve synchronous and uniform air cutting on both sides.

[0065] In some embodiments, the first centrifugal impeller 31 and the second centrifugal impeller 33 are configured to rotate coaxially and in the same direction, and the volute portions 15 of the first air duct shell 11 and the second air duct shell 13 are arranged in opposite directions.

[0066] The volute portions 15 of the first air duct shell 11 and the second air duct shell 13 are arranged in opposite directions, which enables the first centrifugal impeller 31 and the second centrifugal impeller 33, which rotate in the same direction, to generate airflow from both sides of the rotation axis, so as to form uniform airflow on both sides.

[0067] In some embodiments, the openings of the first air outlet 111 and the second air outlet 131 face the same direction, and specifically, the openings of the first air outlet 111 and the second air outlet 131 both face upward in the height direction.

[0068] In other words, the air duct sections 17 of the first air duct shell 11 and the second air duct shell 13 are respectively configured to extend in the same direction in the area near the air outlet.

[0069] Thus, although the first air outlet 111 and the second air outlet 131 are in different positions, the airflow generated can be accurately directed at the clothes above, so as to achieve efficient drying.

[0070] In some embodiments, the air duct section 17 includes an outlet section 171 and a guide section 173. The outlet section 171 forms an air outlet, and the guide section 173 connects the volute section 15 and the outlet section 171. Understandably, the guide section 173 can extend in a straight direction.

[0071] The air duct section 17 may also include a connecting section 175, which connects the volute section 15 and the air guide section 173, and rectifies the airflow generated by the volute section 15 to a suitable direction before sending it to the air guide section 173.

[0072] Because the airflow field output by the volute 15 will be deflected along the tangential direction of the volute tongue 151, in order to ensure that the main airflow at the air outlet is perpendicular to the ground and evenly delivered upwards, this guide section 173 is set up to rectify the airflow during the flow of the airflow in the guide section 173, eliminate the oblique angle of the airflow, effectively improve the airflow deflection phenomenon, and thus enhance the uniformity of drying clothes in the air duct.

[0073] Furthermore, if the length of the guide section 173 is L and the diameter of the centrifugal impeller is D, then D / 2≤L≤3D / 2.

[0074] If the distance of the guide section 173 is too small, the above effect cannot be achieved; if the distance is too large, it will increase the friction loss along the duct and reduce the outlet air velocity and volume. Therefore, limiting the length L of the guide section 173 to D / 2≤L≤3D / 2 can improve the air supply deviation and reasonably control the airflow loss.

[0075] In some embodiments, the heating device 50 is disposed within the air guide section 173 and is arranged parallel to the axial direction of the centrifugal impeller. If the horizontal distance between the heating device 50 and the centrifugal impeller is C, then 2D / 3 ≤ C ≤ 2D.

[0076] The heating device 50 can be, but is not limited to, a heating wire, a PTC heating element, etc., as long as it can generate heat and maintain the conductivity of the air guide section 173.

[0077] If the horizontal distance C between the heating element 50 and the centrifugal impeller is too small, the high temperature of the heating element 50 will cause the centrifugal impeller to deform, affecting its aerodynamic performance. If the distance between the heating element 50 and the centrifugal impeller is too large, the surface of the heating element 50 will be unevenly exposed to airflow, affecting the heating effect of the dryer. Therefore, setting 2D / 3 ≤ C ≤ 2D can reduce the impact of the high temperature generated by the heating element 50 on the centrifugal impeller, while making the surface of the heating element 50 more evenly exposed to airflow, thus improving the heating effect of the dryer.

[0078] In some embodiments, the air outlet is in the first direction (corresponding to) Figure 5 and Figure 6 If the width in the left-right direction is b, and the diameter of the centrifugal impeller is D, then D / 2 ≤ b ≤ D. Wherein, the first direction is perpendicular to the axial direction of the centrifugal impeller.

[0079] If the air outlet size is too small, it will reduce the width of the airflow, affecting the evenness of airflow to the clothes. If the size is too large, it will cause uneven airflow on the left and right sides of the air outlet, reducing the airflow speed at the outlet and thus affecting the dryer's performance. Therefore, let D / 2 ≤ b ≤ D, to increase the width of the airflow while ensuring the airflow speed at the air outlet.

[0080] Please refer to the following: Figure 7 and Figure 8 In some embodiments, the first centrifugal impeller 31 and the second centrifugal impeller 33 are arranged longitudinally along the same axis and spaced apart from each other. The duct device 100 also includes a dual-axis motor 71, which has two output shafts 711. The dual-axis motor 71 is located between the first centrifugal impeller 31 and the second centrifugal impeller 33, and is respectively connected to the first centrifugal impeller 31 and the second centrifugal impeller 33 through the two output shafts 711.

[0081] The two output shafts 711 of the dual-axis motor 71 are located at opposite ends. The dual-axis motor 71 drives the two centrifugal impellers to rotate simultaneously, serving as the core aerodynamic source of the entire air duct device 100, which helps to simplify the structure of the air duct device 100.

[0082] In some embodiments, the air duct device 100 further includes a motor support 73, and a dual-axis motor 71 is mounted between the first centrifugal impeller 31 and the second centrifugal impeller 33 via the motor support 73.

[0083] The motor support 73 can stably fix the dual-shaft motor 71, which helps it to run smoothly and also helps to reduce operating noise.

[0084] Understandably, in some other embodiments, the first centrifugal impeller 31 and the second centrifugal impeller 33 may also be driven to rotate by two different motors, or driven by the same motor and then rotated in opposite directions after being transmitted through a transmission mechanism, etc., without being specifically limited here.

[0085] This application also provides a clothes dryer, including the aforementioned air duct device 100. Understandably, to achieve its normal function, the clothes dryer also includes conventional clothes racks, bases, etc., which will not be described in detail here.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A ductwork device, characterized in that, The air duct device includes at least two sets of air duct components. Each set of air duct components includes an air duct shell and a centrifugal impeller. An air outlet is formed on the air duct shell. The centrifugal impeller is disposed inside the air duct shell and is configured to form a supply airflow toward the air outlet. The air duct device includes a first air duct assembly and a second air duct assembly. The first air duct assembly includes a first air duct shell (11) and a first centrifugal impeller (31). The first air duct shell (11) forms a first air outlet (111), and the first centrifugal impeller (31) is disposed inside the first air duct shell (11). The second air duct assembly includes a second air duct shell (13) and a second centrifugal impeller (33). The second air duct shell (13) forms a second air outlet (131). The second air outlet (131) is spaced apart from the first air outlet (111). The second centrifugal impeller (33) is disposed inside the second air duct shell (13). Each of the air duct shells includes a volute portion (15) and an air duct portion (17) that are connected to each other. The axis passing through the center of the centrifugal impeller and perpendicular to the horizontal plane is the central axis Z of the centrifugal impeller; The angle formed by the line connecting the volute tongue (151) of the first air duct shell (11) and the axis of the first centrifugal impeller (31) with the central axis Z of the first centrifugal impeller (31) is the phase angle θ1 of the volute tongue (151) of the first air duct shell (11), then 30°≤θ1≤90°; and / or, the angle formed by the line connecting the volute tongue (151) of the second air duct shell (13) and the axis of the second centrifugal impeller (33) with the central axis Z of the second centrifugal impeller (33) is the phase angle θ2 of the volute tongue (151) of the second air duct shell (13), then -90°≤θ2≤-30°.

2. The air duct device according to claim 1, characterized in that, The centrifugal impeller is disposed in the volute portion (15) of the air duct shell, and the air duct portion (17) forms the air outlet respectively; the volute shape of the volute portion (15) is a spiral or an arc formed by a combination of base circles of different radii.

3. The air duct device according to claim 2, characterized in that, The gap between the volute tongue (151) of the volute (15) and the centrifugal impeller is A, and the diameter of the centrifugal impeller is D. Then D / 28≤A≤D / 10.

4. The air duct device according to claim 2, characterized in that, The first centrifugal impeller (31) and the second centrifugal impeller (33) are configured to rotate coaxially and in the same direction, and the volute portion (15) of the first air duct shell (11) and the second air duct shell (13) are arranged in opposite directions.

5. The air duct device according to claim 4, characterized in that, The openings of the first air outlet (111) and the second air outlet (131) face the same direction.

6. The air duct device according to claim 2, characterized in that, Each of the air duct sections (17) includes an outlet section (171) and a guide section (173). The outlet section (171) is used to form an air outlet, and the guide section (173) is connected between the volute section (15) and the outlet section (171).

7. The air duct device according to claim 6, characterized in that, The length of the air guide section (173) is L, and the diameter of the centrifugal impeller is D. Then D / 2≤L≤3D / 2.

8. The air duct device according to claim 6, characterized in that, Each of the air duct components further includes a heating device (50), which is located in the air guide section (173) and is arranged parallel to the axial direction of the centrifugal impeller. If the horizontal distance between the heating device (50) and the centrifugal fan is C, then 2D / 3≤C≤2D.

9. The air duct device according to any one of claims 1-8, characterized in that, The first centrifugal impeller (31) and the second centrifugal impeller (33) are arranged longitudinally along the same axis and are spaced apart from each other; The air duct device also includes a dual-axis motor (71), which has two output shafts (711). The dual-axis motor (71) is located between the first centrifugal impeller (31) and the second centrifugal impeller (33), and is connected to the first centrifugal impeller (31) and the second centrifugal impeller (33) respectively through the two output shafts (711).

10. The air duct device according to claim 9, characterized in that, The air duct device also includes a motor support (73), and the dual-shaft motor (71) is mounted between the first centrifugal impeller (31) and the second centrifugal impeller (33) through the motor support (73).

11. The air duct device according to any one of claims 1-8, characterized in that, The air duct device also includes a base, which includes a first base (91) and a second base (93). The first air duct shell (11) is disposed inside the first base (91) and forms the first air outlet (111) on the outer surface of the first base (91). The second air duct shell (13) is disposed inside the second base (93) and forms the second air outlet (131) on the outer surface of the second base (93).

12. The air duct device according to any one of claims 1-8, characterized in that, The width of the air outlet in the first direction is b, and the diameter of the centrifugal impeller is D. Then D / 2≤b≤D, where the first direction is perpendicular to the axial direction of the centrifugal impeller.

13. A clothes dryer, characterized in that, Includes the air duct device as described in any one of claims 1-12.

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