Drying air duct structure and clothes drying device with same

Abstract

The utility model provides a drying air duct structure which is applied to a clothes drying device, the clothes drying device comprises a drying cylinder, a clothes drying cavity is formed in the drying cylinder, the clothes drying cavity is provided with an airflow inlet and an airflow outlet, and the drying air duct structure is communicated between the airflow inlet and the airflow outlet. The drying air duct structure comprises a rear cover plate and a back plate which are buckled together front and back to form the drying air duct structure, and two air inlets are located in the lower portion of the drying air duct structure and used for introducing hot air from a heating source into an air duct cavity of the drying air duct structure. When the back plate and the rear cover plate are buckled together front and back to form a drying air duct structure, the first volute structures and the second volute structures are matched together in a one-to-one correspondence mode to form two volute air ducts. The two volute air ducts are in one-to-one correspondence with the two air inlets so as to be respectively provided with an impeller for introducing hot air from a heating source into the air duct cavity of the drying air duct structure; and the air supply direction of the air supply outlet of each volute air duct faces the air outlet of the drying air duct structure.

Description

Technical Field

[0001] The utility model relates to the technical field of laundry equipment, and in particular to a drying air duct structure and a clothes drying device having the same. Background Art

[0002] In the technical field of laundry equipment, a clothes dryer usually includes a drying drum, a drum motor that drives the drying drum to rotate, and a fan that provides drying air for the drying drum. A driving device is provided on the clothes dryer to drive the drying drum to rotate and stir the clothes in the drying drum; and to drive the fan to rotate, so as to form an airflow in the air duct formed by the air duct and the drying drum, and to use the airflow to dry the clothes in the drying drum. There is only one impeller system in the clothes dryer, which leads to a small amount of air actually generated by the impeller. When the driving device is reversed, the actual air volume of the impeller is greatly reduced or even no wind, and it is impossible to achieve fast drying and energy saving. The prior art discloses a double impeller system, which shares a set of driving devices with the drying drum, and the two impellers are connected by a belt, but in this way, the two impellers rotate in the same direction. Regardless of whether the driving device rotates forward or reversely, there is a situation where the air volume of one impeller is small or no wind, and the advantages of the double impellers cannot be fully utilized; and the volute below the rear air duct is not provided with a volute tongue, and there is only one pressure profile on the back plate that matches the volute, and the tangent of the pressure profile is close to the second air outlet, which greatly increases the interference between the two air paths when the two impellers work at the same time.

[0003] Based on the above technical defects, there is a need for improvement. Summary of the invention

[0004] The present application is based on the inventor's discovery and understanding of the following problems and facts: 1. There is no wind when the impeller reverses, resulting in low drying efficiency and high load on the compressor; 2. When the two impellers are running at the same time, the two airflows interfere with each other and the air volume superposition is not obvious.

[0005] The utility model aims to solve one of the above technical problems at least to a certain extent.

[0006] Therefore, one purpose of the present invention is to provide a drying air duct structure.

[0007] Another object of the present invention is to provide a clothes drying device having the above drying air duct structure.

[0008] The first embodiment is: a drying air duct structure, applied to a clothes drying device, the clothes drying device includes a drying drum, the interior of the drying drum forms a clothes drying chamber, the clothes drying chamber is provided with an air flow inlet and an air flow outlet, the drying air duct structure is connected between the air flow inlet and the air flow outlet, and the drying air duct structure includes:

[0009] A back plate, used for supporting the rear side of the drying drum;

[0010] A rear cover plate, wherein the rear cover plate and the back plate are buckled together to form a drying air duct structure, and an air duct cavity is formed inside the drying air duct structure;

[0011] The air duct cavity is provided with an air outlet and two air inlets, the air outlet is communicated with the air flow inlet of the drying cylinder; the two air inlets are used to introduce hot air from a heating source into the air duct cavity of the drying air duct structure;

[0012] The back plate is formed with two first volute structures, and the rear cover plate is formed with two second volute structures. When the back plate and the rear cover plate are buckled together to form the drying air duct structure, the first volute structures and the second volute structures are matched together to form two volute air ducts in a one-to-one correspondence;

[0013] The two volute air ducts correspond one-to-one to the two air inlets, so that an impeller is respectively provided to introduce hot air from the heating source into the air duct cavity of the drying air duct structure; the air supply direction of the air supply outlet of each volute air duct is toward the air outlet of the drying air duct structure.

[0014] Optionally, a side of the back plate facing the rear cover plate is provided with a volute pressing, the volute pressing forms the two first volute structures, the two first volute structures form a double vortex curve profile, the end points of the double vortex curve converge at the top of the drying air duct structure, and the air outlet is provided at the top of the drying air duct structure.

[0015] Optionally, the top of the drying air duct structure forms an arc-shaped top;

[0016] The drying air duct structure is a mirror-symmetrical structure in the shape of a double number 6.

[0017] Optionally, a first air guide plate corresponding to the first volute structure is provided on the rear cover plate, and is located above the air outlet of the air supply duct; a second air guide plate corresponding to the second volute structure is provided on the rear cover plate, and is located above the air outlet of the air supply duct; the air supply direction of the air supply outlet of each of the volute air ducts is toward the corresponding air guide plate, the first air guide plate and the second air guide plate are both arc-shaped, and the adjacent ends of the first air guide plate and the second air guide plate are connected together to form an air guide structure of the air duct cavity of the drying air duct structure.

[0018] Optionally, the first air guide plate forms a first arc, one end of the first arc is tangent to the first vortex curve, the second air guide plate forms a second arc, one end of the second arc is tangent to the second vortex curve, and the other end of the first arc and the other end of the second arc converge at the symmetry center of the drying air duct structure.

[0019] Optionally, the two air inlets include a first air inlet and a second air inlet;

[0020] The drying air duct structure also includes a first impeller and a second impeller;

[0021] The two volute air ducts include a first volute air duct and a second volute air duct, the first impeller is arranged in the first volute air duct, the second impeller is arranged in the second volute air duct, and the air supply port of the first volute air duct is connected to the air supply port of the second volute air duct;

[0022] The first volute air duct and the second volute air duct are arranged in mirror symmetry, and the mirror symmetry center line of the two is perpendicular to the axis of the drying drum;

[0023] The first volute air duct is formed with a first volute tongue structure; the second volute air duct is formed with a second volute tongue structure;

[0024] The first volute tongue structure and the second volute tongue structure are arranged between the rotation axis of the first volute air duct and the rotation axis of the second volute air duct, and are arranged in mirror symmetry with respect to the mirror symmetry center line;

[0025] The first air guide plate and the second air guide plate are mirror-symmetrical structures, and the mirror-symmetrical center lines of the first and second volute air ducts are on the same straight line.

[0026] Optionally, the two impellers are respectively provided with an impeller driving device, wherein the first impeller driving device is drivingly connected to the first impeller, and the second impeller driving device is drivingly connected to the second impeller.

[0027] Optionally, the rear cover plate is provided with two mounting holes corresponding one to one with the air inlet, wherein one mounting hole is used for mounting an impeller driving device of the first impeller, and the other mounting hole is used for mounting an impeller driving device of the second impeller.

[0028] Optionally, the first impeller is provided with an impeller driving device to independently drive the first impeller to rotate;

[0029] The second impeller is drivingly connected to the driving device of the drying drum so as to rotate along with the driving device of the drying drum.

[0030] The second embodiment is:

[0031] A clothes drying device, comprising the above-mentioned drying air duct structure.

[0032] Beneficial effects of the present invention:

[0033] By adding an impeller and a volute structure on the back plate, the back plate and the rear cover plate are buckled together front and back to form a drying duct structure, wherein the first volute structure and the second volute structure each form two volute air ducts, and the air supply direction of each volute air duct is toward the air outlet of the drying duct structure; combining the arc-shaped top on the basis of the volute profiling can make the airflow flow to the air outlet more stably, will not interfere with each other in the drying duct structure, thereby reducing the air volume loss, increasing the air volume supplied, and improving the working efficiency of drying clothes.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure of a clothes drying device according to an embodiment of the utility model;

[0036] Figure 2 is a schematic diagram of an explosion and decomposition of a clothes drying device according to an embodiment of the utility model;

[0037] Figure 3 is a schematic diagram of a drying air duct structure according to an embodiment of the utility model;

[0038] Figure 4 This is a structural schematic diagram of a rear cover plate of a drying air duct structure according to an embodiment of the utility model;

[0039] Figure 5 is a schematic diagram of airflow of a drying air duct structure according to an embodiment of the utility model;

[0040] Figure 6 is a structural schematic diagram of a rear cover plate of a drying air duct structure according to another embodiment of the utility model;

[0041] Figure 7 is a schematic diagram of airflow of a drying air duct structure according to another embodiment of the utility model;

[0042] Reference numerals:

[0043] 1. Drying drum, 2. Back plate, 3. Rear cover, 4. First motor, 5. Drying drum drive device, 6. Impeller, 61. First impeller, 62. Second impeller, 8. Air inlet, 10. First volute structure, 11. Second volute structure, 21. Volute profiling, 31. First volute tongue structure, 32. Second volute tongue structure, 33. Double vortex curve, 35. First air guide plate 351. Second air guide plate. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] Compared with the prior art, the dual impellers and the drum share a set of driving devices, and the two impellers are connected by a belt. However, in this method, the two impellers rotate in the same direction. Regardless of whether the driving device rotates forward or reverse, one impeller has a small air volume or no wind, and the advantages of the dual impellers cannot be fully utilized; and the volute below the rear air duct is not provided with a volute tongue, and there is only one pressure profile on the back plate that matches the volute, and the tangent of the pressure profile is close to the second air outlet. When the two impellers work at the same time, the interference between the two air paths is greatly increased. Improvements are made to address the problems of no wind when the impeller reverses, low drying efficiency, and high load on the compressor, and the problem of interference between the two air flows and unclear air volume superposition when the two impellers are running at the same time.

[0050] The following is a specific description in conjunction with the embodiments:

[0051] Embodiment 1:

[0052] Combined with Figure 3-7 The present embodiment takes a drying air duct structure as an example and is applied to a clothes drying device. The clothes drying device comprises a drying drum 1, a clothes drying chamber is formed inside the drying drum 1, an air flow inlet and an air flow outlet are provided in the clothes drying chamber, and the drying air duct structure is connected between the air flow inlet and the air flow outlet. The drying air duct structure comprises: a back plate 2, which is used to support the rear side of the drying drum 1; a rear cover plate 3, which is buckled together with the back plate 2 to form a drying air duct structure, and an air duct chamber is formed inside the drying air duct structure; the air duct chamber is provided with an air outlet and two air inlets 8, and the air outlet is connected to the air flow inlet of the drying drum 1; the two air inlets 8 are used to supply air to the drying drum 1; The hot air from the heating source is introduced into the air duct cavity of the dry air duct structure; the back plate 2 is formed with two first volute structures 10, and the rear cover plate 3 is formed with two second volute structures 11. When the back plate 2 and the rear cover plate 3 are buckled together front and back to form a drying air duct structure, the first volute structure 10 and the second volute structure 11 are matched together in a one-to-one manner to form two volute air ducts; the two volute air ducts correspond to the two air inlets 8 in a one-to-one manner, so that an impeller 6 is respectively provided to introduce the hot air from the heating source into the air duct cavity of the drying air duct structure; the air supply direction of the air supply port of each volute air duct is toward the air outlet of the drying air duct structure.

[0053] Specifically, by adding an impeller 6 and a volute structure on the back plate 2, the back plate 2 and the rear cover plate 3 are buckled together front and back to form a drying air duct structure, wherein the first volute structure 10 and the second volute structure 11 each form two volute air ducts, and the air supply direction of each volute air duct is toward the air outlet of the drying air duct structure; this can avoid mutual interference of airflows in the drying air duct structure, give full play to the advantages of the multiple impellers 6, increase the air supply volume, and improve the drying work efficiency.

[0054] Preferably, a volute profile 21 is provided on one side of the back plate 2 facing the rear cover plate 3, and the volute profile 21 forms two first volute structures 10, and the two first volute structures 10 form a double vortex curve 33 profile line, and the end point of the double vortex curve 33 converges at the top of the drying air duct structure, and an air outlet is provided at the top of the drying air duct structure. Preferably, the top of the drying air duct structure forms an arc top; the drying air duct is a mirror-symmetrical structure, in the shape of a double number 6.

[0055] Specifically, an installation position for the impeller 6 is reserved in the volute profile 21, and the profile increases the distance between the back plate 2 and the drying air duct, so that a wider impeller 6 can be installed. At the same speed, the wide impeller 6 can provide a larger air volume; the double vortex curve 33 is used to collect the gas thrown out from the impeller 6, so that it flows to the air inlet, and in the process of this flow, a part of the dynamic pressure energy obtained by the gas from the impeller 6 is converted into static pressure energy, forming a certain wind pressure.

[0056] Furthermore, by combining the arc-shaped top on the basis of the volute profile 21, the airflow can flow to the air outlet more stably without interfering with each other in the drying air duct structure, thereby ensuring the air supply volume and improving the work efficiency of drying clothes.

[0057] Preferably, a first air guide plate 35 corresponding to the first volute structure 10 is provided on the rear cover plate 3, and is located above the air outlet of the air supply duct; a second air guide plate 351 corresponding to the second volute structure 11 is provided on the rear cover plate 3, and is located above the air outlet of the air supply duct; the air supply direction of the air outlet of each volute duct is toward the air guide plate corresponding thereto, and the first air guide plate 35 and the second air guide plate 351 are both arc-shaped, and the adjacent ends of the first air guide plate 35 and the second air guide plate 351 are connected together to form an air guide structure of the air duct cavity of the drying air duct structure. Preferably, the first air guide plate 35 forms a first arc, and one end of the first arc is tangent to the first vortex curve, and the second air guide plate 351 forms a second arc, and one end of the second arc is tangent to the second vortex curve, and the other end of the first arc and the other end of the second arc meet at the symmetry center of the drying air duct structure.

[0058] Furthermore, the first air guide plate 35 and the second air guide plate 351 form an air guide structure, and another preferred scheme is: the structure adopts a double-arc air guide structure to better play a drainage role, and send the wind into the air outlet more accurately, thereby ensuring the air supply volume to a great extent and improving the work efficiency of drying clothes.

[0059] Preferably, the two air inlets include a first air inlet and a second air inlet; the drying air duct structure also includes a first impeller 61 and a second impeller 62; the two volute air ducts include a first volute air duct and a second volute air duct, the first impeller 61 is arranged in the first volute air duct, and the second impeller 62 is arranged in the second volute air duct, and the air supply port of the first volute air duct is connected with the air supply port of the second volute air duct; the first volute air duct and the second volute air duct are arranged in a mirror-symmetrical manner, and the mirror-symmetrical center line of the two is perpendicular to the axial center line of the drying drum 1; the first volute air duct forms a first volute tongue structure 31; the second volute air duct forms a second volute tongue structure 32; the first volute tongue structure 31 and the second volute tongue structure 32 are arranged between the rotation axis of the first volute air duct and the rotation axis of the second volute air duct, and are mirror-symmetrically arranged relative to the mirror-symmetrical center line; the first air guide plate 35 and the second air guide plate 351 are mirror-symmetrical structures, and their mirror-symmetrical center lines are on the same straight line as the mirror-symmetrical center lines of the first volute air duct and the second volute air duct.

[0060] Specifically, the two volute tongues are positioned independently, and the first volute tongue is arranged in the first volute air duct. The second volute tongue is arranged in the second volute air duct. The two volute tongues are arranged symmetrically and arranged between the two air outlets. When the airflow passes near the volute tongue, the volute tongue divides them into two. Most of the airflow flows to the outlet of the fan, and a small part of the airflow flows back to the volute through the gap between the volute tongue and the impeller 6. After rotating with the impeller 6 for one circle in the volute, it returns to the volute tongue to participate in the new diversion. It can prevent the gas from circulating in the volute and reduce the noise at the same time.

[0061] Furthermore, the end point of the first vortex curve in the volute converges with the end point of the second vortex curve at the top of the drying air duct, which can better play a drainage role and send wind into and out of the air outlet more accurately, thereby ensuring the air supply volume to a great extent and improving the work efficiency of drying clothes.

[0062] Preferably, the two impellers 6 are respectively provided with an impeller driving device, wherein the first impeller driving device is drivingly connected to the first impeller 61, and the second impeller driving device is drivingly connected to the second impeller 62. The rear cover plate 3 is provided with two mounting holes corresponding to the air inlet one by one, wherein one mounting hole is used to install the impeller driving device of the first impeller 61, and the other is used to install the impeller driving device of the second impeller 62. Preferably, the first impeller 61 is provided with an impeller driving device to independently drive the first impeller 61 to rotate; the second impeller 62 is drivingly connected to the drying drum driving device 5 to rotate with the drying drum driving device 5.

[0063] Specifically, at least one of the impellers 6 is driven by an independent motor. The first impeller 61 is driven by the first motor, and the second impeller 62 is coaxial with the motor of the drying drum, which can reduce the cost of one motor, save energy and protect the environment, and make the overall structure compact.

[0064] Furthermore, when the two impellers work at the same time, the airflow direction generated by the two impellers is as shown in the following figure. Figure 5 As shown in FIG. 7 , the two airflows will conflict with each other when they meet at the top of the drying air duct. To solve the conflict problem, an air guide plate is preferably provided above the drying air duct. One end of the first arc on the air guide plate is tangent to the first vortex curve, and one end of the second arc is tangent to the second vortex curve. One end of the first arc and one end of the second arc meet at the center of the drying air duct. The air guide plate can reduce the interference between the two airflows and reduce the air volume loss.

[0065] Embodiment 2:

[0066] Combined with Figure 1-2 The second embodiment is: a clothes drying device having the above-mentioned drying air duct structure.

[0067] Specifically, in the early stage of drying, the moisture content of clothes is high, the temperature rise of the heating source (heat pump, electric heating, PTC) is slow, and the amount of moisture carried is less than the amount of dehumidification. At this time, the speed of the first impeller 61 can be reduced to reduce energy consumption; as the temperature of the heating source tends to stabilize, the speed of the first impeller 61 is increased, and it can be stabilized at a high speed state to speed up the wind circulation. In the later stage of drying, the moisture content of clothes is low, and the ambient temperature in the internal circulation is high. At this time, the dehumidification efficiency is low, and the speed of the first impeller 61 can be further increased. The large air volume passes through the clothes, and the moisture on the difficult-to-dry or folded parts of the clothes is taken away, thereby improving the uniformity of drying. In the later stage, the clothes are basically shaped, and the reversal frequency of the drying drum 1 can be reduced, giving full play to the advantages of the double impellers and increasing the air volume;

[0068] The purpose of the reverse rotation of the drying drum 1 is to loosen the clothes and prevent them from being entangled; the second impeller 62 is coaxial with the drying drum 1, and there is no wind when the drying drum 1 is reversed, which is not good for air supply, but the forward and reverse rotation of the drying drum 1 can better prevent the clothes from being entangled.

[0069] Among them, the moisture content refers to the amount of water vapor taken away from the clothes when the air passes through the clothes; the dehumidification content refers to the amount of water vapor condensed and converted into water when the air passes through the condensing device (evaporator, water cooling, etc.). Assuming that the relative humidity of the air before entering the clothes is A, the relative humidity after passing through the clothes is B, and the relative humidity after passing through the condensing device is C. Generally, the path from the air to the condensing device after passing through the clothes is shorter, and the intermediate loss is less. The relative humidity before the air enters the condensing device is also equal to B, then the moisture content is BA, and the dehumidification content is BC, that is, by comparing the values ​​of A and C; the factors that cause the moisture content and dehumidification content to be unequal mainly include the temperature of the air after being heated by the heating source, the weight of the clothes in the drum, and the temperature of the condensing device.

[0070] The utility model adds an impeller 6 and a volute structure on the back plate 2, so that the back plate 2 and the rear cover plate 3 are buckled together front and back to form a drying air duct structure, wherein the first volute structure 10 and the second volute structure 11 each form two volute air ducts, and the air supply direction of each volute air duct is toward the air outlet of the drying air duct structure; on the basis of the volute pressure profile 21, combined with the arc-shaped top, the airflow can flow to the air outlet more stably, will not interfere with each other in the drying air duct structure, reduce the air volume loss, increase the air volume supplied, and improve the working efficiency of drying clothes.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0072] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A drying air duct structure, applied to a clothes drying device, the clothes drying device comprising a drying drum, the interior of the drying drum forming a clothes drying chamber, the clothes drying chamber being provided with an air flow inlet and an air flow outlet, the drying air duct structure being connected between the air flow inlet and the air flow outlet, characterized in that: The drying air duct structure comprises: A back plate, used for supporting the rear side of the drying drum; A rear cover plate, wherein the rear cover plate and the back plate are buckled together to form a drying air duct structure, and an air duct cavity is formed inside the drying air duct structure; The air duct cavity is provided with an air outlet and two air inlets, the air outlet is communicated with the air flow inlet of the drying cylinder; the two air inlets are used to introduce hot air from a heating source into the air duct cavity of the drying air duct structure; The back plate is formed with two first volute structures, and the rear cover plate is formed with two second volute structures. When the back plate and the rear cover plate are buckled together to form the drying air duct structure, the first volute structures and the second volute structures are matched together to form two volute air ducts in a one-to-one correspondence; The two volute air ducts correspond one-to-one to the two air inlets, so that an impeller is respectively provided to introduce hot air from the heating source into the air duct cavity of the drying air duct structure; the air supply direction of the air supply outlet of each volute air duct is toward the air outlet of the drying air duct structure.

2. The drying air duct structure according to claim 1, characterized in that: A volute molding is provided on one side of the back plate facing the rear cover plate, and the volute molding forms the two first volute structures. The two first volute structures form a double vortex curve profile, and the end points of the double vortex curves converge at the top of the drying air duct structure, and the air outlet is provided at the top of the drying air duct structure.

3. The drying air duct structure according to claim 2, characterized in that: The top of the drying air duct structure forms an arc-shaped top; The drying air duct has a mirror-symmetrical structure.

4. The drying air duct structure according to claim 2, characterized in that: A first air guide plate corresponding to the first volute structure is provided on the rear cover plate, and is located above the air outlet of the air supply duct; a second air guide plate corresponding to the second volute structure is provided on the rear cover plate, and is located above the air outlet of the air supply duct; the air supply direction of the air supply outlet of each volute duct is toward the corresponding air guide plate, the first air guide plate and the second air guide plate are both arc-shaped, and the adjacent ends of the first air guide plate and the second air guide plate are connected together to form the air guide structure of the air duct cavity of the drying duct structure.

5. The drying air duct structure according to claim 4, characterized in that: The first air guide plate forms a first arc, one end of which is tangent to the first vortex curve, the second air guide plate forms a second arc, one end of which is tangent to the second vortex curve, and the other end of the first arc and the other end of the second arc converge at the symmetry center of the drying air duct structure.

6. The drying air duct structure according to claim 4 or 5, characterized in that: The two air inlets include a first air inlet and a second air inlet; The drying air duct structure also includes a first impeller and a second impeller; The two volute air ducts include a first volute air duct and a second volute air duct, the first impeller is arranged in the first volute air duct, the second impeller is arranged in the second volute air duct, and the air supply port of the first volute air duct is connected to the air supply port of the second volute air duct; The first volute air duct and the second volute air duct are arranged in mirror symmetry, and the mirror symmetry center line of the two is perpendicular to the axis of the drying drum; The first volute air duct is formed with a first volute tongue structure; the second volute air duct is formed with a second volute tongue structure; The first volute tongue structure and the second volute tongue structure are arranged between the rotation axis of the first volute air duct and the rotation axis of the second volute air duct, and are arranged in mirror symmetry with respect to the mirror symmetry center line; The first air guide plate and the second air guide plate are mirror-symmetrical structures, and the mirror-symmetrical center lines of the first and second volute air ducts are on the same straight line.

7. The drying air duct structure according to claim 6, characterized in that: The two impellers are respectively provided with an impeller driving device, wherein the first impeller driving device is drivingly connected to the first impeller, and the second impeller driving device is drivingly connected to the second impeller.

8. The drying air duct structure according to claim 7, characterized in that: The rear cover plate is provided with two mounting holes corresponding to the air inlets one by one, wherein one mounting hole is used for mounting the impeller driving device of the first impeller, and the other mounting hole is used for mounting the impeller driving device of the second impeller.

9. The drying air duct structure according to claim 6, characterized in that: The first impeller is provided with an impeller driving device to independently drive the first impeller to rotate; The second impeller is drivingly connected to the driving device of the drying drum so as to rotate along with the driving device of the drying drum.

10. A clothes drying device, characterized in that: The clothes drying device has the drying air duct structure according to any one of claims 1-8.

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