Clothes drying apparatus and drying control method

Abstract

The application provides a clothes drying device, which comprises a drying drum, a drying cavity formed in the drying drum, and an air inlet communicated with the drying cavity; an air supply duct having a plurality of air inlets and an air outlet, wherein the air outlet is used for communication with the air inlet, and the air inlets are used for introducing hot air from a heating source into the air supply duct; a plurality of impellers corresponding to the air inlets and arranged at the air inlets, wherein the air outlets of the plurality of impellers are sent into the air supply duct; a drum driving device used for driving the drying drum to rotate; and an impeller driving device used for independently driving at least one impeller to rotate and adjusting the rotating speed of the at least one impeller according to different drying stages. By adjusting the rotating speed of the impeller, the advantages of the plurality of impellers are fully exerted, the air supply amount is increased, and the drying work efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laundry equipment, in particular, relates to a clothes drying device and a drying control method. BACKGROUND

[0002] In the technical field of laundry equipment, a clothes dryer generally comprises a drying drum, a drum motor for driving the rotation of the drying drum, and a fan for providing drying air to the drying drum. A driving device is arranged on the clothes dryer to drive the rotation of the drying drum and agitate the clothes in the drying drum, and to drive the rotation of the fan to form an air flow in the air duct formed by the air duct and the drying drum, so as to dry the clothes in the drying drum. The clothes dryer has only one impeller system, which results in a small actual air volume of the impeller. When the driving device is reversed, the actual air volume of the impeller is greatly reduced or even no air, which cannot achieve fast drying and energy saving. The prior art discloses a double-impeller system, which shares a set of driving device with the drying drum, and the two impellers are connected by a belt. However, the two impellers rotate in the same direction, and no matter the driving device is forward or reverse, there is a situation that one of the two impellers has a small air volume or no air, which cannot fully utilize the advantages of the double-impeller system. Moreover, the volute under the rear air duct is not provided with a volute tongue, which greatly increases the interference between the two air paths when the two impellers work simultaneously.

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

[0004] The present application is based on the findings and recognitions of the inventors on the following problems and facts: 1. The problem of no air when the impeller is reversed, low drying efficiency and high compressor load; 2. The problem that the impeller and the drum motor are coaxial, the fan speed cannot be adjusted, and the air volume is not adjustable.

[0005] The present application aims to at least solve one of the above technical problems to some extent.

[0006] Therefore, one object of the present application is to provide a clothes drying device.

[0007] Another object of the present application is to provide a drying control method for the above-mentioned clothes drying device.

[0008] A first aspect of the present application provides a clothes drying device, comprising:

[0009] a drying drum, the inside of the drying drum forming a drying cavity, the drying drum being provided with an air inlet communicating with the drying cavity;

[0010] an air supply air duct having a plurality of air inlets and air outlets, wherein the air outlets are used to communicate with the air inlet, and the air inlets are used to introduce hot air from a heating source into the air supply air duct;

[0011] a plurality of impellers, which are arranged at the plurality of air inlets one-to-one corresponding to the plurality of air inlets, and air outflow of the plurality of impellers is sent into the air supply air duct;

[0012] a drum driving device for driving the drying drum to rotate;

[0013] an impeller driving device for independently driving at least one of the impellers to rotate and adjusting a rotating speed of the at least one of the impellers according to different drying stages.

[0014] Optionally, the clothes drying device comprises a back plate and a back cover plate, the back plate and the back cover plate are buckled together in front of and behind each other to enclose the air supply air duct;

[0015] The back plate is arranged at a rear part of the drying drum and is provided with a first through hole and a plurality of second through holes, wherein the first through hole is used for communicating the air inflow of the drying drum with the air outflow of the air supply air duct, and the plurality of second through holes are used for communicating with the plurality of air inlets of the air supply air duct one-to-one corresponding to the plurality of air inlets, and the hot air first flows into the plurality of second through holes and then flows into the plurality of air inlets from the plurality of second through holes.

[0016] Optionally, the back plate is formed with a first volute structure corresponding to the number of the plurality of impellers, and the back cover plate is formed with a second volute structure corresponding to the number of the plurality of impellers, when the back plate and the back cover plate are buckled together in front of and behind each other to form the air supply air duct, the first volute structure and the second volute structure are matched together one-to-one to form a volute air duct of each of the impellers;

[0017] Air supply directions of air supply outlets of each of the volute air ducts are all towards the air inflow of the air supply air duct, the air supply air duct is provided with a communication air duct for communicating each of the air outflows with the air outflow of the air supply air duct, and the air supply air duct comprises the volute air duct and the communication air duct.

[0018] Optionally, the plurality of air inlets comprises a first air inlet and a second air inlet;

[0019] The plurality of impellers comprises a first impeller and a second impeller;

[0020] The volute air duct comprises a first volute air duct and a second volute air duct, the first impeller is arranged in the first volute air duct, and the second impeller is arranged in the second volute air duct, and an air supply outlet of the first volute air duct is in communication with an air supply outlet of the second volute air duct;

[0021] The first volute air duct and the second volute air duct are arranged in mirror image symmetry, and a mirror image symmetry center line of the first volute air duct and the second volute air duct is perpendicular to an axis center line of the drying drum;

[0022] The first volute air duct is formed with a first volute tongue structure, and the second volute air duct is formed with a second volute tongue structure.

[0023] 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 relative to the mirror symmetry center line;

[0024] Preferably, the communication air duct is a mirror symmetry structure, and the mirror symmetry center line thereof is on the same straight line as the mirror symmetry center lines of the first volute air duct and the second volute air duct.

[0025] Optionally, the impeller driving device is provided with two, wherein the first impeller driving device is connected with the first impeller, and the second impeller driving device is connected with the second impeller;

[0026] The back cover plate is provided with two mounting holes corresponding to the air inlets, one of which is used for mounting the first impeller, and the other is used for mounting the second impeller;

[0027] The first impeller can be independently rotated and the rotating speed thereof can be adjusted by the first impeller driving device, and the second impeller can be independently rotated and the rotating speed thereof can be adjusted by the second impeller driving device.

[0028] Optionally, the plurality of air inlets includes a first air inlet and a second air inlet;

[0029] The plurality of impellers includes a first impeller and a second impeller;

[0030] The second impeller is synchronously driven to rotate by the drum driving device, and the first impeller is independently driven to rotate by the impeller driving device and can be adjusted in rotating speed;

[0031] The second impeller can only be rotated in one direction by the drum driving device;

[0032] The direction in which the first impeller is driven to rotate by the impeller driving device is opposite to the direction in which the second impeller rotates.

[0033] Optionally, the plurality of air inlets includes a first air inlet and a second air inlet;

[0034] The plurality of impellers includes a first impeller and a second impeller;

[0035] The second impeller is synchronously driven to rotate by the drum driving device, and the first impeller is independently driven to rotate by the impeller driving device and can be adjusted in rotating speed;

[0036] The second impeller can only be rotated in one direction by the drum driving device;

[0037] The first impeller is driven to rotate by the impeller driving device in a direction opposite to the direction in which the second impeller rotates.

[0038] Optionally, the first impeller and the second impeller are designed as:

[0039] When the amount of air generated by the rotation of the second impeller driven by the drum driving device is M1, the amount of air generated by the rotation of the first impeller driven by the impeller driving device is M2.

[0040] When the second impeller is not driven to rotate by the drum driving device, the amount of air generated by the rotation of the first impeller driven by the impeller driving device is M2+M1.

[0041] Optionally, the first impeller and the second impeller are further designed as:

[0042] When the amount of air generated by the rotation of the first impeller driven by the impeller driving device is M2, the rotation speed is N1; when the amount of air generated by the rotation of the first impeller driven by the impeller driving device is M2+M1, the rotation speed is 2N1.

[0043] The second aspect of the present application provides a drying control method for the above-described clothes drying device:

[0044] The rotation speed of the first impeller and / or the rotation speed of the second impeller is controlled according to the drying progress.

[0045] The rotation speed of the first impeller is controlled according to the drying progress.

[0046] The control of the rotation speed of the first impeller according to the drying progress comprises:

[0047] When the temperature of the heating source is less than a set threshold T1, the first impeller is controlled to not rotate or to maintain the rotation speed N1 when the drying drum is reversed;

[0048] When the temperature of the heating source is greater than the set threshold T1, the rotation speed of the first impeller is increased to N2, and the first impeller is stably operated at the rotation speed;

[0049] When it is detected that the difference between the temperature of the heating source and the temperature of the air outlet is less than a set threshold T, the rotation speed of the first impeller is increased to N3, and the frequency of reversing the drying drum is reduced;

[0050] N3>N2>N1.

[0051] The present application has the following beneficial effects:

[0052] By driving at least one of the plurality of impellers by a separate impeller driving device, sufficient air volume is provided for both forward rotation and reverse rotation. The impeller driven by the separate impeller driving device is involved in the drying system according to different drying stages, the rotation speed of the impeller is adjusted, the advantages of multiple impellers are fully utilized, the air supply is increased, and the drying efficiency is improved.

[0053] Additional aspects and advantages of the present application will be set forth in part in the description which follows, and in part will be obvious from the description, or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a schematic diagram of the overall structure of a clothes drying apparatus according to an embodiment of the present application;

[0055] Figure 2 is a schematic diagram of an exploded view of a clothes drying apparatus according to an embodiment of the present application;

[0056] Figure 3 is a schematic diagram of the structure of a rear cover plate of a clothes drying apparatus according to an embodiment of the present application;

[0057] Figure 4 is a schematic diagram of the overall structure of a clothes drying apparatus according to another embodiment of the present application;

[0058] Figure 5 is a schematic diagram of an exploded view of a clothes drying apparatus according to another embodiment of the present application;

[0059] Figure 6 is a schematic diagram of a flow of a drum operation control impeller according to an embodiment of the present application; Reference numerals:

[0060] 1. Drying drum, 2. Rear back plate, 3. Rear cover plate, 4. First motor, 5. Drum driving device, 6. First impeller, 7. Second impeller, 9. First through hole, 10. Second through hole, 31. First volute structure, 32. Second volute structure. DETAILED DESCRIPTION

[0061] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or components, the intention being to describe embodiments exemplifying the present application without restricting it.

[0062] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0063] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0064] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0066] Compared with the prior art double-impeller and drum sharing a set of driving device, the two impellers are connected by a belt, but the two impellers rotate in the same direction, and no matter the driving device is forward or reverse, there is a small or no wind condition for one impeller, which cannot fully utilize the advantages of double-impeller; and the volute under the rear air duct is not provided with a volute tongue, which greatly increases the interference between the two air paths when the two impellers work at the same time. In view of the problems of no wind when the impeller is reversed, low drying efficiency and high compressor load, and the problems of coaxial impeller and drum motor, which cannot adjust the fan speed and the air volume, the present application is improved.

[0067] The following will be specifically described with examples:

[0068] Example 1

[0069] This embodiment takes a clothes drying device as an example, which comprises:

[0070] The drying cylinder 1 forms a drying cavity in the inside thereof, and is provided with an air flow inlet communicating with the drying cavity; an air supply duct having a plurality of air inlets and air outlets, wherein the air outlets are used to communicate with the air flow inlet, and the air inlets are used to introduce hot air from a heating source into the air supply duct; a plurality of impellers corresponding to the plurality of air inlets and arranged at the plurality of air inlets, and the air outlets of the plurality of impellers are sent into the air supply duct; a roller driving device 5 used to drive the drying cylinder 1 to rotate; and an impeller driving device used to independently drive at least one impeller to rotate and adjust the rotating speed of the at least one impeller according to different drying stages.

[0071] Specifically, at least one impeller in the plurality of impellers is driven by the separate impeller driving device to meet the requirement of sufficient air volume in forward rotation and reverse rotation; and the impeller driven by the separate impeller driving device is involved in the drying system according to different drying stages to adjust the rotating speed of the impeller, fully exert the advantages of the plurality of impellers, increase the air supply volume, and improve the drying efficiency.

[0072] Preferably, the clothes drying device comprises a back plate 2 and a cover plate 3, and the back plate 2 and the cover plate 3 are buckled together to form the air supply duct; the back plate 2 is arranged at the rear of the drying cylinder 1, and is provided with a first through hole 9 and a plurality of second through holes 10, wherein the first through hole 9 is used to communicate the air flow inlet of the drying cylinder 1 with the air outlet of the air supply duct; and the plurality of second through holes 10 are used to communicate with the plurality of air inlets of the air supply duct one by one, and the hot air first flows into the plurality of second through holes 10, and then flows into the plurality of air inlets from the plurality of second through holes 10. Preferably, the back plate 2 is formed with a first volute structure corresponding to the number of the plurality of impellers, and the cover plate 3 is formed with a second volute structure corresponding to the number of the plurality of impellers; when the back plate 2 and the cover plate 3 are buckled together to form the air supply duct, the first volute structure and the second volute structure are matched together one by one to form a volute air duct of each impeller; the air supply direction of the air supply outlet of each volute air duct is towards the air flow inlet of the air supply duct; and the air supply duct is provided with a communication air duct communicating the air outlets with the air outlet of the air supply duct, and the air supply duct comprises the volute air duct and the communication air duct.

[0073] Preferably, the plurality of air inlets comprises a first air inlet and a second air inlet; the plurality of impellers comprises a first impeller 6 and a second impeller 7; the volute air duct comprises a first volute air duct and a second volute air duct, the first impeller 6 is arranged in the first volute air duct, the second impeller 7 is arranged in the second volute air duct, the air outlet of the first volute air duct is in communication with the air outlet of the second volute air duct; the first volute air duct and the second volute air duct are arranged in mirror image symmetry, and the mirror image symmetry center lines of the first volute air duct and the second volute air duct are perpendicular to the axis of the drying cylinder; 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 arranged in mirror image symmetry with respect to the mirror image symmetry center line; preferably, the communication air duct is a mirror image symmetry structure, and the mirror image symmetry center line of the communication air duct is on the same straight line as the mirror image symmetry center lines of the first volute air duct and the second volute air duct.

[0074] One preferred scheme is that the impeller driving device is provided with two, wherein the first impeller driving device is drivingly connected with the first impeller 6, and the second impeller driving device is drivingly connected with the second impeller 7; the back cover plate 3 is provided with two mounting holes corresponding to the air inlets, one of which is used for mounting the first impeller 6, and the other is used for mounting the second impeller 7; the first impeller 6 can be independently rotated and the rotating speed thereof can be adjusted by the first impeller driving device, and the second impeller 7 can be independently rotated and the rotating speed thereof can be adjusted by the second impeller driving device.

[0075] Another preferred scheme is that the plurality of air inlets comprises a first air inlet and a second air inlet; the plurality of impellers comprises a first impeller 6 and a second impeller 7; wherein the second impeller 7 is synchronously driven to rotate by the roller driving device 5; the first impeller 6 is independently driven to rotate by the impeller driving device and the rotating speed thereof can be adjusted; the second impeller 7 can only be rotated in one direction by the roller driving device 5; the direction in which the first impeller 6 is driven to rotate by the impeller driving device is opposite to the direction in which the second impeller is rotated.

[0076] Another preferred scheme is that the plurality of air inlets comprises a first air inlet and a second air inlet; the plurality of impellers comprises a first impeller 6 and a second impeller 7; wherein the second impeller 7 is synchronously driven to rotate by the roller driving device 5; the first impeller 6 is independently driven to rotate by the impeller driving device and the rotating speed thereof can be adjusted; the second impeller 7 can only be rotated in one direction by the roller driving device 5; the direction in which the first impeller 6 is driven to rotate by the impeller driving device is opposite to the direction in which the second impeller is rotated.

[0077] Specifically, by driving at least one of the two impellers by a separate impeller driving device or driving both of the two impellers by separate impeller driving devices, sufficient air volume is ensured for both forward rotation and reverse rotation; the impellers driven by the impeller driving devices are involved in the drying system according to different drying stages, the rotation speed of the impellers is adjusted, the advantages of multiple impellers are fully utilized, the air volume is increased, and the drying efficiency is improved.

[0078] Preferably, the first impeller 6 and the second impeller 7 are designed such that when the second impeller 7 is driven to rotate by the drum driving device 5 to generate air volume M1, the first impeller 6 is driven to rotate by the impeller driving device to generate air volume M2; when the second impeller 7 is not driven to rotate by the drum driving device 5, the first impeller 6 is driven to rotate by the impeller driving device to generate air volume M2+M1. Preferably, the first impeller 6 and the second impeller 7 are further designed such that when the first impeller 6 is driven to rotate by the impeller driving device 5 to generate air volume M2, the rotation speed is N1; when the first impeller 6 is driven to rotate by the impeller driving device to generate air volume M2+M1, the rotation speed is 2N1.

[0079] Specifically, increasing the air volume can improve the efficiency of drying clothes, save user waiting time, improve the use comfort, etc.; the way to increase the air volume includes increasing the rotation speed, widening the impeller, etc., which are not limited thereto, and will not be described here.

[0080] Specifically, as shown in FIG. 1, Figures 3-5 The drying device can be a heat pump dryer. The wet hot steam introduced from the air outlet of the drying drum first passes through the evaporator of the heat pump module to condense the water vapor into water droplets, and then passes through the condenser to be heated. Under the suction of multiple impellers, the air flow reflows to multiple air inlets and enters the air supply air duct through multiple impellers, and then flows into the air outlet from the air supply air duct, and then flows into the air inlet from the air outlet, and then returns to the drying drum from the air inlet to complete the circulation, thereby achieving the purpose of drying clothes in the drying drum. In this process, part of the multiple impellers can be driven to rotate by the drum driving mechanism, and part of the multiple impellers can be driven to rotate by the driving mechanism of the impeller itself. Of course, more preferably, the multiple impellers are all provided with driving mechanisms to more controllably achieve the circulation of the drying air flow and the control of the air volume according to the drying process.

[0081] Alternatively, the evaporator can be replaced by a water cooling structure, and the condenser can be replaced by an electric heater, a PTC heater, etc.

[0082] Regardless of the form, before the drying air flow returns to the drying drum, it always needs to pass through a heating source to be heated to reduce the humidity.

[0083] Embodiment 2

[0084] The embodiment provides a method for further controlling the rotating speed of the clothes drying device to increase the air supply on the basis of the clothes drying device having multiple impellers to provide air volume.

[0085] In combination Figure 6 A drying control method of the clothes drying device, according to the drying process, controls the rotating speed of the first impeller 6 and / or the rotating speed of the second impeller 7. The rotating speed of the first impeller 6 is controlled according to the drying process, including: when the heating source temperature is less than a set threshold T1, the first impeller 6 is controlled to not rotate or to keep the rotating speed N1 when the drying drum 1 reverses; when the heating source temperature is greater than the set threshold T1, the rotating speed of the first impeller 6 is increased to N2 and is kept at the rotating speed; when the difference between the heating source temperature and the air outlet temperature is less than a set threshold T, the rotating speed of the first impeller 6 is increased to N3, and the frequency of the reverse rotation of the drying drum 1 is reduced; N3>N2>N1.

[0086] Specifically, the embodiment preferably adjusts the rotating speed of the impeller, fully utilizes the advantages of the multiple impellers, increases the air supply, and improves the drying efficiency.

[0087] Further, when the drum driving device 5 rotates forward, the first impeller 6 and the second impeller 7 work simultaneously to generate the first air volume, and when the drum driving device 5 reverses, the second impeller 7 reverses, at this time, the air is sucked back to the air duct, and no air enters the drying drum; at this time, the rotating speed of the first impeller 6 is increased from N1 to N2, which is about twice of N1, at this time, the generated air volume is the second air volume, and the first air volume and the second air volume are basically the same, which meets the requirement that the air volume is basically the same in forward and reverse rotation.

[0088] In the early stage of drying, the moisture content of the clothes is high, the temperature of the heating source (heat pump, electric heating, PTC) rises slowly, the wet air amount is less than the dehumidification amount, at this time, the rotating speed can be reduced to reduce the energy consumption. The heating source temperature is set to T1, if the heating source temperature (which can be understood as the heating temperature provided by the heating source) is less than the set threshold T1, the first impeller 6 is controlled to not rotate or to keep the rotating speed N1 when the drum driving device 5 reverses; as the heating source temperature tends to be stable, the heating source temperature is greater than the set threshold T1, at this time, the wet air amount and the dehumidification amount are basically the same, the rotating speed of the first impeller 6 is increased to N2, and is kept at the high rotating speed state to speed up the air circulation. In the late stage of drying, the moisture content of the clothes is small, and the environment temperature in the internal circulation is high, if the difference between the heating source temperature and the air outlet temperature is less than the set threshold T, at this time, the dehumidification efficiency is low, the rotating speed of the first impeller 6 can be appropriately increased to N3, the large air volume penetrates the clothes, the moisture in the position of the clothes which is difficult to dry or folded is removed, the drying uniformity is improved, and the frequency of the reverse rotation of the drying drum can be reduced, the advantages of the double impellers are fully utilized, and the air volume is increased.

[0089] Further, the moisture-carrying amount refers to the amount of water vapor carried away from the clothes by air, and the moisture-removing amount refers to the amount of water vapor condensed into water when air passes through a condensing device (evaporator, water cooling, etc.). Assuming that the relative humidity of 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, the path of air passing through the clothes to the condensing device is short, and the loss is small, and the relative humidity of air before entering the condensing device is also equal to B. Therefore, the moisture-carrying amount is B-A, and the moisture-removing amount is B-C, that is, by comparing the values of A and C. The main factors that are not equal to each other are the temperature of air after being heated by a heating source, the weight of clothes in the drum, and the temperature of the condensing device.

[0090] The first impeller 6 and the second impeller 7 are both driven by independent motors, and neither of them is limited by the forward and reverse rotation of the drum driving device 5. The combined rotation speed of the two impellers has a large adjustable range, and the impellers will not be reversed, reducing the air backflow situation, and fully exerting the double-impeller effect.

[0091] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.

[0092] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A clothes drying apparatus, characterized by, The dryer comprises: a drying drum, an inside of which forms a drying cavity, the drying drum being provided with an air flow inlet communicating with the drying cavity; an air supply air duct having a plurality of air inlets and an air outlet, wherein the air outlet is used to communicate with the air flow inlet, and the air inlets are used to introduce hot air from a heating source into the air supply air duct; a plurality of impellers corresponding to the plurality of air inlets and arranged at the plurality of air inlets, the air outlets of the plurality of impellers being supplied into the air supply air duct; the plurality of air inlets comprises a first air inlet and a second air inlet; the plurality of impellers comprises a first impeller and a second impeller, wherein the first impeller is arranged at the first air inlet, and the second impeller is arranged at the second air inlet; a drum driving device for driving the drying drum to rotate and synchronously driving the second impeller to rotate; an impeller driving device for independently driving the first impeller and adjusting the rotating speed of the first impeller according to different drying stages of a drying process; the second impeller can only be driven by the drum driving device to rotate in one direction; the rotating direction of the first impeller driven by the impeller driving device is opposite to the rotating direction of the second impeller; wherein the adjusting of the rotating speed of the first impeller according to different drying stages of a drying process comprises: when the temperature of the heating source is less than a set threshold T1, the first impeller is controlled to not rotate or to keep a rotating speed N1 when the drying drum reverses; when the temperature of the heating source is greater than the set threshold T1, the rotating speed of the first impeller is increased to N2, and the first impeller is stably operated at the rotating speed; when it is detected that the difference between the temperature of the heating source and the temperature of the air outlet is less than a set threshold T, the rotating speed of the first impeller is increased to N3, and the frequency of reversing the drying drum is reduced; N3>N2>N1.

2. The dryer according to claim 1, wherein the dryer comprises a back plate and a back cover plate, the back plate and the back cover plate are buckled together in front of and behind to enclose the air supply air duct; the back plate is arranged at the rear of the drying drum, and is provided with a first through hole and a plurality of second through holes, wherein the first through hole is used to communicate the air flow inlet of the drying drum with the air outlet of the air supply air duct, and the plurality of second through holes correspond to the plurality of air inlets of the air supply air duct one by one, and the hot air flows into the plurality of second through holes first, and then flows into the plurality of air inlets from the plurality of second through holes.

3. The dryer according to claim 2, wherein the back plate is formed with a first volute structure corresponding to the number of the plurality of impellers, and the back cover plate is formed with a second volute structure corresponding to the number of the plurality of impellers, when the back plate and the back cover plate are buckled together in front of and behind to form the air supply air duct, the first volute structure and the second volute structure are matched together one by one to form a volute air duct of each impeller; the air supply direction of the air supply port of each volute air duct is towards the air flow inlet of the air supply air duct, and the air supply air duct comprises the volute air duct and a communication air duct communicating each air outlet with the air outlet of the air supply air duct.

4. The dryer according to claim 3, wherein The 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 outlet of the first volute air duct is in communication with the air outlet 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 lines of the first volute air duct and the second volute air duct are perpendicular to the axis of the drying drum; The first volute air duct is formed with a first volute tongue structure, and 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 relative to the mirror symmetry center line.

5. The clothes drying device according to any one of claims 1-4, wherein the first impeller and the second impeller are designed such that: when the second impeller is driven to rotate by the drum driving device to generate an air volume M1, the first impeller is driven to rotate by the impeller driving device to generate an air volume M2; and when the second impeller is not driven to rotate by the drum driving device, the first impeller is driven to rotate by the impeller driving device to generate an air volume M2+M1.

6. The clothes drying device according to claim 5, wherein the first impeller and the second impeller are further designed such that: when the first impeller is driven to rotate by the impeller driving device to generate the air volume M2, the rotation speed is N1; and when the first impeller is driven to rotate by the impeller driving device to generate the air volume M2+M1, the rotation speed is 2N1.

7. A drying control method of the clothes drying device according to any one of claims 1-6, wherein the rotation speed of the first impeller is controlled according to the drying progress, and the control of the rotation speed of the first impeller according to the drying progress includes: when the temperature of the heating source is less than a set threshold T1, the first impeller is controlled to not rotate or to maintain the rotation speed N1 when the drying drum reverses; when the temperature of the heating source is greater than the set threshold T1, the rotation speed of the first impeller is increased to N2 and is stably operated at the rotation speed; when the difference between the temperature of the heating source and the outlet air temperature is less than a set threshold T, the rotation speed of the first impeller is increased to N3 and the frequency of the reversal of the drying drum is reduced; and N3>N2>N1. ​ ​ ​ ​ ​ ​

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