Drying device and wind resistance detection method thereof

Abstract

The invention relates to the technical field of clothes processing equipment, and particularly provides a drying device and a wind resistance detection method thereof. The drying device aims at solving the problems that in the prior art, airflow turbulence is likely to happen to an air supply part of a drying device, and noise is likely to happen. Therefore, the drying device comprises a centrifugal fan, the centrifugal fan comprises a shell and an impeller which is arranged in the shell in a self-rotating mode, an air inlet and an air outlet are formed in the shell, and the impeller is arranged to be capable of driving air to enter from the air inlet and be blown out from the air outlet. The impeller comprises a base plate and a plurality of fan blades arranged on one side of the base plate, and the distance between the fan blades changes according to the sine or cosine rule. Based on the structural arrangement, according to the centrifugal fan, the fan blades are irregularly arranged, so that air flowing out of the fan blades is dispersed, the air pressure is small, and then the air pressure noise can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of clothing processing equipment, and specifically provides a drying device and a wind resistance detection method thereof. Background Art

[0002] With the development of social economy, clothes processing equipment with drying function has been widely used, especially in areas with high humidity. The drying function of clothes processing equipment with drying function meets people's urgent need to dry clothes. The drying device usually uses heat pump compression to pressurize and heat the refrigerant. The refrigerant is sent to the condenser to release heat. The condenser is connected to the air path in the dryer to release dry air. The refrigerant enters the capillary pressure and temperature from the condenser and then enters the evaporator. The evaporator is also connected to the drying air path to turn the humid hot air into dry cold air. The operation of the above refrigerant, combined with the tumbling of the drum in the clothes drying equipment and the air supply of the drying fan, achieves the effect of drying clothes.

[0003] In the prior art, the drying device is connected to the air duct to supply air to the dryer. Since the diameter of the air supply part from the rear cover of the air duct to the drying drum is larger than that of the volute part, the wind delivered by the fan blows forward along the volute, which can easily cause airflow turbulence at the air supply part, forming turbulence, affecting the air volume entering the drum, and also easily generating noise, affecting the user experience.

[0004] The art requires a drying device and a wind resistance detection method thereof to solve the above technical problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, in the prior art, the drying device is prone to air flow turbulence at the air supply position and noise.

[0006] In a first aspect, the present invention provides a drying device, the drying device comprising a centrifugal fan,

[0007] The centrifugal fan comprises a housing and an impeller rotatably arranged inside the housing.

[0008] An air inlet and an air outlet are arranged on the housing, and the impeller is arranged to drive air to enter from the air inlet and blow out from the air outlet.

[0009] The impeller comprises a chassis and a plurality of blades arranged on one side of the chassis, and the spacing between the plurality of blades varies in a sinusoidal or cosine manner.

[0010] In a specific implementation of the above drying device, a cut angle is provided on a side of the fan blade away from the housing.

[0011] In a specific implementation of the above drying device, the cut angle is arranged on a side of the fan blade away from the chassis.

[0012] In a specific embodiment of the above drying device, the drying device includes a guide plate,

[0013] The guide plate is connected to the air outlet of the housing.

[0014] The guide plate is provided with a guide device.

[0015] In a specific embodiment of the drying device, the guide device includes a first guide rib and a second guide rib arranged opposite to each other.

[0016] The first guide rib is arranged along the airflow direction.

[0017] The second guide rib is bent, and the distance between the second guide rib and the first guide rib decreases first and then increases.

[0018] In a specific implementation of the above drying device, the fan blades are provided with micropores.

[0019] In a specific implementation of the drying device, the distances between the micro holes and the bottom plate are the same.

[0020] In a specific embodiment of the above drying device, the drying device further comprises a volute tongue,

[0021] The volute tongue is arranged between the centrifugal fan and the guide plate.

[0022] In the specific implementation of the drying device, the side wall of the volute tongue is provided with an inclined surface, or

[0023] The volute tongue is provided with a first step ramp structure or a concave ramp structure along the wind flow direction, or

[0024] The volute tongue is provided with a second stepped ramp structure along a direction parallel to the central axis of the impeller.

[0025] In the case of adopting the above technical solution, the centrifugal fan provided by the present invention includes a housing and an impeller rotatably arranged inside the housing, an air inlet and an air outlet are arranged on the housing, the impeller is arranged to drive air to enter from the air inlet and blow out from the air outlet, the impeller includes a chassis and a plurality of blades arranged on one side of the chassis, and the spacing of the plurality of blades varies in a sine or cosine law. Based on the above structural setting, the centrifugal fan uses blades arranged in a sine or cosine law to make the gas flowing out of the blades more dispersed and the air pressure is smaller, thereby reducing the air pressure noise.

[0026] Furthermore, the drying device provided by the present invention defines a cut-angle structure, so that the air outlet area of ​​the fan blades is increased, the air flow can flow out quickly, and noise caused by excessive gas pressure is avoided.

[0027] Furthermore, the drying device provided by the present invention limits the angled structure to be arranged on the side close to the chassis. Due to the centrifugal effect, the airflow will generate an outward force, so that the air pressure on the side of the fan blade close to the chassis is higher. Increasing the air outlet area there can effectively reduce the gas pressure and reduce noise.

[0028] Furthermore, the drying device provided by the present invention is provided with a guide plate so that the gas flows from the air outlet to the air duct along the direction of the guide plate.

[0029] Furthermore, the drying device provided by the present invention is provided with a first guide rib and a second guide rib, so that the air inlet area of ​​the airflow entering the guide plate is smaller and the air outlet area is larger, thereby reducing the noise when the airflow flows out.

[0030] Furthermore, the drying device provided by the present invention is provided with a microporous structure to reduce the air pressure at the fan blades and reduce noise.

[0031] Furthermore, the drying device provided by the present invention limits the distances between the micropores and the bottom plate to be the same, so as to further reduce the air pressure at the same cut surface of the fan blades at the same time, thereby ensuring that the flow direction of the gas flowing out of the micropores is the same.

[0032] Furthermore, the drying device provided by the present invention is also provided with a volute tongue to effectively reduce the rotation noise of the centrifugal fan.

[0033] Furthermore, the drying device provided by the present invention sets the volute tongue to a variety of shapes to further disperse the airflow and reduce noise.

[0034] In a second aspect, the present invention further provides a method for detecting wind resistance of a drying device, wherein the drying device further comprises an air duct and a drying box, wherein the air duct is connected to the centrifugal fan and the drying box respectively, a filter is provided between the air duct and the drying box, and a wind resistance detection device and a pneumatic cleaning device are further provided on the air duct, wherein the detection method comprises:

[0035] Start the drying module;

[0036] Get wind resistance value;

[0037] If the wind resistance value is greater than a threshold value, controlling the pneumatic cleaning device to start;

[0038] If the wind resistance value is less than or equal to a threshold value, the pneumatic cleaning device is controlled to be closed.

[0039] Based on the above control method, when the drying device starts the drying module, the wind resistance detection device automatically detects the wind resistance value of the current filter. It can be understood that when the wind resistance value is small, it means that the ventilation state of the current filter is good; when the wind resistance value is large, it means that the ventilation state of the current filter is poor. Therefore, when the wind resistance value is greater than the threshold, the pneumatic cleaning device is controlled to start to clean the filter to maintain the cleanliness of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0041] Figure 1 It is a structural schematic diagram of a centrifugal fan in a drying device provided by the present invention;

[0042] Figure 2 It is a structural schematic diagram of a first embodiment of a fan blade cutting angle in a drying device provided by the present invention;

[0043] Figure 3 It is a structural schematic diagram of a second embodiment of the fan blade cutting angle in the drying device provided by the present invention;

[0044] Figure 4 It is a schematic diagram of the structure of the fan blade micropores in the drying device provided by the present invention;

[0045] Figure 5 It is a schematic diagram of the overall structure of the centrifugal fan and the guide plate in the drying device provided by the present invention;

[0046] Figure 6 It is a structural schematic diagram of a first embodiment of a volute tongue in a drying device provided by the present invention;

[0047] Figure 7 It is a structural schematic diagram of a second embodiment of a volute tongue in a drying device provided by the present invention;

[0048] Figure 8 It is a structural schematic diagram of a third embodiment of a volute tongue in a drying device provided by the present invention;

[0049] Fig. 9 It is a flow chart of the steps of the wind resistance detection method of the drying device of the present invention. Reference numerals:

[0050] 1. Centrifugal fan; 11. Impeller; 111. Chassis; 112. Blade; 113. Cutting angle; 114. Micropore; 2. Guide plate; 21. Guide device; 211. First guide rib; 212. Second guide rib; 22. Guide tile; 3. Snail tongue; 31. Inclined surface; 32. First step ramp structure; 33. Second step ramp structure. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios. For example, although this specific embodiment is described in conjunction with the situation where the drying device is applied to a clothing care machine, the drying device of the present invention can obviously also be used in other devices. Such changes in the application scenarios do not deviate from the basic principles of the present invention and fall within the scope of protection of the present invention.

[0052] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0053] It should be noted that, in the description of the preferred embodiment, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be directly connected, it can also be indirectly connected through an intermediate medium, it can also be connected inside two elements, and these cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0054] With the development of social economy, clothes processing equipment with drying function has been widely used, especially in areas with high humidity. The drying function of clothes processing equipment with drying function meets people's needs for drying clothes in a hurry. At present, the clothes drying equipment on the market usually includes heat pump type and condensation type. The heat pump drying uses the heat pump to compress the refrigerant to pressurize and heat it. The refrigerant is sent to the condenser to release heat. The condenser is connected to the air path in the dryer to release dry air. The refrigerant enters the capillary from the condenser and the pressure and temperature drop rapidly, and then enters the evaporator. The evaporator is also connected to the drying air path to turn the humid hot air into dry cold air. The operation of the above refrigerant, combined with the tumbling of the drum in the clothes drying equipment and the air supply of the drying fan, achieves the effect of drying clothes. The drying effect of this equipment is good, but the equipment cost is relatively high; the condensation drying uses the heater to heat the air to turn it into dry hot air and send it into the drum in the clothes drying equipment. After passing through the clothes, it becomes humid hot air. After the humid hot air is introduced into the condenser, it becomes dry cold air. Then, through the action of the fan, the dry cold air is sent to the heater for heating and sent into the drum. This cycle continuously removes moisture from the clothes to achieve the purpose of drying clothes.

[0055] In the prior art, the drying device is connected to the air duct to supply air to the dryer. Since the diameter of the air supply part from the rear cover of the air duct to the drying drum is larger than that of the volute part, the wind delivered by the fan blows forward along the volute, which can easily cause airflow turbulence at the air supply part, forming turbulence, affecting the air volume entering the drum, and also easily generating noise, affecting the user experience.

[0056] First, see Figure 1 , Figure 1 Schematic diagram of the structure of the centrifugal fan in the drying device provided by the present invention. Figure 1 As shown, the drying device includes a centrifugal fan 1, which includes a housing (not shown in the figure) and an impeller 11 rotatably arranged inside the housing, an air inlet and an air outlet are arranged on the housing, and the impeller 11 is arranged to drive air to enter from the air inlet and blow out from the air outlet. The impeller 11 includes a chassis 111 and a plurality of blades 112 arranged on one side of the chassis 111, and the spacing of the plurality of blades 112 changes in a sine or cosine law. Based on the above structural arrangement, the centrifugal fan 1 is provided with blades 112 arranged in a sine or cosine law, so that the gas flowing out of the blades 112 is more dispersed, the air pressure is smaller, and the air pressure noise can be reduced. It should be noted that the present invention does not impose any restrictions on the specific structure and number of the blades 112, and those skilled in the art can set them according to actual use requirements. For example, the number of blades 112 can be twenty to maintain the stability of the impeller 11.

[0057] As a preferred embodiment, the spacing between the fan blades 112 may vary in a sinusoidal manner. Specifically, the spacing between the fan blades 112 may be expressed as follows:

[0058] ψ'=ψ+Asinnψ

[0059] Where, ψ': adjusted blade spacing; ψ: basic blade spacing; A: modulation amplitude; n: number of cycles of the modulation amount.

[0060] For example, the basic blade spacing ψ is 5 cm, the modulation amplitude A is 1, and the number of cycles of the modulation amount n is 1, then the blade spacing of the spacing M is 5 cm, the blade spacing of the spacing N is 6 cm, the blade spacing of the spacing P is 5 cm, and the blade spacing of the spacing Q is 4 cm. Among them, the blade spacing at the center of MN should be (5+sin45°) cm, and so on, and the remaining blades 112 are set according to the sine law.

[0061] As another preferred embodiment, the spacing between the fan blades 112 may vary in a cosine law. Specifically, the spacing between the fan blades 112 may be expressed as follows:

[0062] ψ'=ψ+Acosnψ

[0063] Where, ψ': adjusted blade spacing; ψ: basic blade spacing; A: modulation amplitude; n: number of cycles of the modulation amount.

[0064] For example, the basic blade spacing ψ is 5 cm, the modulation amplitude A is 1, and the number of cycles of the modulation amount n is 1, then the blade spacing of the spacing M is 6 cm, the blade spacing of the spacing N is 5 cm, the blade spacing of the spacing P is 4 cm, and the blade spacing of the spacing Q is 5 cm. Among them, the blade spacing at the center of MN should be (5+cos45°) cm, and so on, and the remaining blades 112 are all set according to the cosine law.

[0065] In this preferred embodiment, the chassis 111 of the impeller 11 is circular, and the blades 112 are arranged around the chassis 111, so that the plurality of blades 112 are arranged in a circular array. Since the spacing between the blades 112 varies in a sine or cosine pattern, the impeller 11 is centrally symmetrical as a whole, so that the wind force blown out from the air outlet is regularly attenuated, which can effectively reduce noise. It should be noted that the present invention does not impose any restrictions on the specific structure and setting size of the chassis 111, and those skilled in the art can set it according to actual use requirements.

[0066] In this preferred embodiment, see Figure 2 , Figure 2 1 is a schematic diagram of the structure of the first embodiment of the fan blade cutting angle in the drying device provided by the present invention. Figure 2As shown, a cut angle 113 is provided on the side of the fan blade 112 away from the housing. Since the cut angle 113 is limited to be provided on the side close to the chassis 111, the airflow produces a centrifugal effect, thereby generating an outward force, so that the air pressure on the side of the fan blade 112 away from the chassis 111 is greater. Therefore, setting the cut angle 113 can effectively reduce the gas pressure and reduce noise. It should be noted that the present invention does not impose any restrictions on the specific structure and setting size of the cut angle 113, and those skilled in the art can set it according to actual use requirements.

[0067] In this preferred embodiment, the cut angle 113 is set on the side of the fan blade 112 away from the chassis 111. Due to the centrifugal effect, the airflow will generate an outward force, so that the air pressure on the side of the fan blade 112 away from the chassis 111 is higher. Increasing the air outlet area at this location can effectively reduce the gas pressure and reduce noise. In a possible implementation, see Figure 2 , the cutting angle 113 can be set as a straight cutting angle, wherein the inclination angle of the cutting angle can be set according to actual use requirements. In another possible implementation, see Figure 3 The cut angle 113 can also be an arc cut angle to further increase the air inlet area and reduce noise. The curvature radius of the arc can be set according to actual usage requirements.

[0068] In this preferred embodiment, see Figure 4 , Figure 4 Schematic diagram of the structure of the fan blade micropores in the drying device provided by the present invention. Figure 4 As shown, the fan blade 112 is provided with micro holes 114 to reduce the air pressure at the fan blade 112 and reduce noise. Figure 4 Each blade 112 is provided with a micropore 114 structure, so that each blade 112 has a noise reduction function. It can be understood that increasing the number of micropores 114 can improve the noise reduction performance of the centrifugal fan 1.

[0069] In other embodiments, some of the blades 112 may not be provided with the micropores 114 structure, and the micropores 114 may be provided only on some of the blades 112, so that the centrifugal fan 1 may also have a wide-band noise reduction function. Of course, in order to ensure the rotation stability of the centrifugal fan 1, for the technical solution of providing the micropores 114 structure only on some of the blades 112, the part of the blades 112 provided with the micropores 114 may be evenly distributed in the part of the blades 112 not provided with the micropores 114, for example, the part of the blades 112 provided with the micropores 114 and the part of the blades 112 not provided with the micropores 114 are arranged one by one in an alternating manner.

[0070] Furthermore, on the same blade 112, the perforation rates of the plurality of micropores 114 are different, so that on the same blade 112, the noise reduction frequency bands corresponding to the micropores 114 are different, thereby achieving noise reduction of noises in as many frequency bands as possible, and then improving the noise reduction frequency band width of the centrifugal fan 1, wherein the perforation rate is the ratio of the area of ​​the micropores 114 on the same blade 112 to the area of ​​the blade 112. It can be understood that the noise reduction frequency bands achieved by the micropores 114 are different due to different perforation rates. Of course, in other embodiments, on the same blade 112, some of the micropores 114 may have the same perforation rate, so that for the same centrifugal fan 1, some of the micropores 114 have the same noise reduction frequency bands. For example, when the noise amount of a certain frequency band is much larger than the noise amount of other frequency bands, the perforation rates of two or more of the micropores 114 may be set to be the same, so as to improve the noise reduction capability of the centrifugal fan 1.

[0071] In this preferred embodiment, the distance between the micropores 114 and the chassis 111 is the same, so that the air pressure of the same section of the fan blade 112 is further reduced at the same time to ensure that the flow direction of the gas flowing out of the micropores 114 is the same. At the same time, the multiple micropores 114 on each fan blade 112 are arranged in a regular pattern, which is conducive to the production of batch and consistent products. Optionally, the micropores 114 can be but not limited to being set as circular holes, polygonal holes, or special-shaped holes. It should be noted that the present invention does not impose any restrictions on the location and specific number of the micropores 114, and those skilled in the art can set them according to actual use requirements. For example, the micropores 114 can be set on the side of the fan blade 112 close to the chassis 111, or in the middle of the fan blade 112, or on the side of the fan blade 112 away from the chassis 111. Each fan blade 112 can be provided with 3 micropores 114, and the intervals between the micropores 114 are the same to improve the processing convenience of the fan blade 112.

[0072] In this preferred embodiment, see Figure 5 , Figure 5 Schematic diagram of the overall structure of the centrifugal fan and guide plate in the drying device provided by the present invention. Figure 5As shown, the drying device also includes a guide plate 2, which is connected to the air outlet of the shell, and a guide device 21 is provided on the guide plate 2. By providing the guide plate 2, the gas flows from the air outlet to the air duct along the direction of the guide plate 2. When the air duct rear cover is fixedly connected to the guide plate 2, the air outlet and the guide device 21 form a corresponding air supply channel, so that the wind derived from the centrifugal fan 1 enters the inner barrel of the clothing processing device through the guide device 21. The guide device 21 can prevent the wind from forming turbulence or turbulence in the wider air duct rear cover, reduce noise, and obtain a larger air supply volume. It should be noted that the present invention does not impose any restrictions on the specific structure and setting size of the guide plate 2, and those skilled in the art can set it according to actual use requirements. In some embodiments, the inner wall of the guide plate 2 is also provided with a plurality of guide tiles 22, which are used to prevent the wind from forming turbulence on the inner surface of the guide plate 2 to reduce noise. Optionally, the guide tiles 22 can be fish scale-shaped.

[0073] In this preferred embodiment, the guide device 21 includes a first guide rib 211 and a second guide rib 212 that are arranged opposite to each other. The first guide rib 211 is arranged along the airflow direction, the second guide rib 212 is arranged in a curved manner, and the distance between the second guide rib 212 and the first guide rib 211 decreases first and then increases. This arrangement makes the air inlet area of ​​the airflow entering the guide plate 2 smaller and the air outlet area larger, thereby making the noise lower when the airflow flows out.

[0074] In this preferred embodiment, the first guide rib 211 is a thin plate-like structure, which is prone to vibration under the blowing of wind, resulting in noise, and is also easily damaged after long-term use. Therefore, the second guide rib 212 is arranged on the opposite side of the first guide rib 211, which can also effectively increase the connection strength between the first guide rib 211 and the guide plate 2, avoid vibration during operation, reduce the working noise of the clothing processing equipment, and increase the service life of the guide plate 2. It should be noted that the present invention does not impose any restrictions on the specific structure and setting size of the first guide rib 211 and the second guide rib 212, and those skilled in the art can set them according to actual use requirements.

[0075] In this preferred embodiment, the drying device provided by the present invention further includes a volute tongue 3, which is arranged between the centrifugal fan 1 and the guide plate 2. The air is drawn through the impeller 11 of the centrifugal fan 1, enters from the air inlet, and forms a high-pressure area in the air collecting chamber. When the airflow flows through the volute tongue 3, it can flow outward along the volute tongue 3, reducing the axial rotating vortex formed in the volute tongue 3 area, reducing the impact on the volute tongue, and achieving the effect of smooth air outlet and reduced fan noise.

[0076] In this preferred embodiment, when the airflow flows through the area of ​​the volute tongue 3, it flows out along the surface of the volute tongue 3. After being rectified by the volute tongue 3, the fluid velocity vector changes, thereby reducing the wind speed and the rotating vortex.

[0077] Optionally, the present invention provides various embodiments of the snail tongue 3, including: Figure 6 As shown, a slope 31 is provided on the side wall of the volute tongue 3, so that the output airflow has less swirl and does not directly hit the volute tongue, thereby reducing the noise of the airflow output. In the above-mentioned inclined volute tongue noise reduction structure, the inclination angle of the slope 31 is set to 10-45 degrees. Or, as Figure 7 As shown, the volute tongue 3 is provided with a first step ramp structure 32 along the wind flow direction. The step setting of the volute tongue 3 can affect the impact force of the airflow hitting the volute tongue 3, avoid the airflow directly hitting the surface of the volute tongue 3 and produce impact sound, and achieve the effect of reducing noise. Or, as Figure 8 As shown, the volute tongue 3 is provided with a second step ramp structure 33 along a direction parallel to the central axis of the impeller. Similarly, the step ramp structure parallel to the central axis of the impeller can also affect the impact force of the airflow hitting the volute tongue 3, avoiding the airflow directly hitting the surface of the volute tongue 3 and generating impact sound, thereby achieving the effect of reducing noise.

[0078] In addition, the present invention also provides a method for detecting wind resistance of a drying device. Fig. 9 , Fig. 9 The figure is a flow chart of the steps of the wind resistance detection method of the drying device of the present invention, wherein the drying device further comprises an air duct and a drying box, the air duct is connected to the centrifugal fan and the drying box respectively, a filter is arranged between the air duct and the drying box, and a wind resistance detection device and a pneumatic cleaning device are also arranged on the air duct. Fig. 9 As shown, based on the drying device in the above embodiment, the wind resistance detection method of the present invention mainly includes the following steps:

[0079] S1: Start the drying module;

[0080] S2: Obtain wind resistance value;

[0081] S3: If the wind resistance value is greater than the threshold, the pneumatic cleaning device is controlled to start;

[0082] S4: If the wind resistance value is less than or equal to the threshold, the pneumatic cleaning device is controlled to be closed.

[0083] Based on the above control method, when the drying device starts the drying module, the wind resistance detection device automatically detects the wind resistance value of the current filter. It can be understood that when the wind resistance value is small, it means that the ventilation state of the current filter is good; when the wind resistance value is large, it means that the ventilation state of the current filter is poor. Therefore, when the wind resistance value is greater than the threshold, the pneumatic cleaning device is controlled to start to clean the filter to maintain the cleanliness of the filter.

[0084] It should be noted that the above-mentioned implementation mode is only used to illustrate the principle of the present invention and is not intended to limit the scope of protection of the present invention. Without departing from the principle of the present invention, those skilled in the art can adjust the above-mentioned structure so that the present invention can be applied to more specific application scenarios.

[0085] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A drying device, characterized in that: The drying device comprises a centrifugal fan, The centrifugal fan comprises a housing and an impeller rotatably arranged inside the housing. An air inlet and an air outlet are arranged on the housing, and the impeller is arranged to drive air to enter from the air inlet and blow out from the air outlet. The impeller comprises a chassis and a plurality of blades arranged on one side of the chassis, and the spacing between the plurality of blades varies in a sinusoidal or cosine manner.

2. The drying device according to claim 1, characterized in that: A cut corner is arranged on a side of the fan blade away from the housing.

3. The drying device according to claim 2, characterized in that: The cut angle is arranged on a side of the fan blade away from the chassis.

4. The drying device according to claim 1, characterized in that: The drying device comprises a guide plate, The guide plate is connected to the air outlet of the housing. The guide plate is provided with a guide device.

5. The drying device according to claim 4, characterized in that: The flow guiding device comprises a first flow guiding rib and a second flow guiding rib which are arranged opposite to each other. The first guide rib is arranged along the airflow direction. The second guide rib is bent, and the distance between the second guide rib and the first guide rib decreases first and then increases.

6. The drying device according to claim 1, characterized in that: The fan blades are provided with micro holes.

7. The drying device according to claim 6, characterized in that: The distances between the micro holes and the bottom plate are all the same.

8. The drying device according to claim 4, characterized in that: The drying device also includes a volute tongue, The volute tongue is arranged between the centrifugal fan and the guide plate.

9. The drying device according to claim 8, characterized in that: The side wall of the volute tongue is provided with an inclined surface, or The volute tongue is provided with a first step ramp structure or a concave ramp structure along the wind flow direction, or The volute tongue is provided with a second stepped ramp structure along a direction parallel to the central axis of the impeller.

10. A method for detecting wind resistance of a drying device according to any one of claims 1 to 9, wherein the drying device further comprises an air duct and a drying box, wherein the air duct is connected to the centrifugal fan and the drying box respectively, a filter is provided between the air duct and the drying box, and a wind resistance detection device and a pneumatic cleaning device are also provided on the air duct, characterized in that: The detection method comprises: Start the drying module; Get wind resistance value; If the wind resistance value is greater than a threshold value, controlling the pneumatic cleaning device to start; If the wind resistance value is less than or equal to a threshold value, the pneumatic cleaning device is controlled to be closed.

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