Fan and drying equipment comprising same

Abstract

The utility model relates to the technical field of clothes processing equipment, in particular to a fan and drying equipment comprising the fan, and aims to solve the problem that the drying efficiency of the drying equipment is poor due to the fact that the fan of the existing drying equipment is limited by the mounting space and the air volume is small. In order to achieve the purpose, the fan comprises a volute and an impeller installed in the volute, blades are arranged on the impeller, an exhaust channel is arranged between the outer ends of the blades and the first inner wall of the volute, the outer ends of the blades are the ends away from the center of the impeller, and a groove structure is arranged at the position, corresponding to the exhaust channel, of the second inner wall of the volute. The groove structure is sunken towards the outer side of the volute in the axis direction of the impeller so that the cross sectional area of the exhaust channel can be increased. According to the utility model, the groove structure which is sunken along the axial direction of the fan is arranged on the volute of the fan, so that the axial space of the fan can be fully utilized to increase the cross sectional area of the exhaust channel, and the drying efficiency of the drying equipment can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of clothing processing equipment, and specifically provides a fan and a drying device comprising the fan. Background Art

[0002] Drying equipment refers to a machine that can use hot air to dry clothes. Drying equipment mainly includes washing and drying machines, clothes dryers or drying machines.

[0003] Taking the washer-dryer as an example, the heating methods of the existing washer-dryers on the market are mostly electric heating or heat pump heating. No matter which heating method is chosen for the dryer, it is inseparable from the circulating air duct during the drying process.

[0004] The power source of the circulating air circuit is the fan, which drives the airflow to circulate. However, due to the limitation of installation space, the existing fans are relatively small in size and have small air volume, resulting in low drying efficiency of the drying equipment, which seriously affects the user experience.

[0005] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the above technical problem, that is, to solve the problem that the fan of the existing drying equipment is limited by the installation space and the air volume is small, resulting in low drying efficiency of the drying equipment.

[0007] In a first aspect, the utility model provides a fan, comprising a volute and an impeller installed in the volute, the impeller being provided with blades, an exhaust passage being provided between the outer end of the blade and a first inner wall of the volute, the outer end of the blade being an end away from the center of the impeller, and a groove structure being provided on the second inner wall of the volute at a position corresponding to the exhaust passage, the groove structure being recessed toward the outer side of the volute along the axial direction of the impeller to increase the cross-sectional area of ​​the exhaust passage.

[0008] In the preferred technical solution of the above-mentioned fan, the groove structure includes a first groove and a second groove connected in sequence along the flow direction of the airflow, the second groove is connected to the air outlet of the volute, the depression depth of the first groove gradually increases along the flow direction of the airflow, and the depression depth of the second groove gradually decreases along the flow direction of the airflow.

[0009] In the preferred technical solution of the above-mentioned fan, the exhaust channel includes a first channel, a second channel and a third channel connected in sequence along the flow direction of the airflow, the third channel is connected to the air outlet, the width of the first channel and the width of the third channel gradually increase along the flow direction of the airflow, and the width of the second channel gradually decreases along the flow direction of the airflow.

[0010] In a preferred technical solution of the above-mentioned fan, the first groove corresponds to a part of the first channel and the second channel, and the second groove corresponds to the third channel.

[0011] In the preferred technical solution of the above-mentioned fan, the ratio of the length of the first channel to the total length of the exhaust channel is 0.75 to 0.85; the ratio of the length of the second channel to the total length of the exhaust channel is 0.05 to 0.07; the ratio of the length of the third channel to the total length of the exhaust channel is 0.08 to 0.2.

[0012] In the preferred technical solution of the above-mentioned fan, the ratio of the length of the first groove to the total length of the groove structure is 0.6 to 0.7; the ratio of the length of the second groove to the total length of the groove structure is 0.3 to 0.4.

[0013] In the preferred technical solution of the above-mentioned fan, the recessed depth of the groove structure is not greater than 30 mm; and / or

[0014] The second inner wall is the inner wall of the volute on which the impeller is mounted.

[0015] In a second aspect, the utility model further provides a drying device, and the drying device of the utility model includes the above-mentioned fan.

[0016] In the preferred technical scheme of the above-mentioned drying equipment, the drying system of the drying equipment includes a first drying air duct, a second drying air duct and a filtering device, the air inlet and air outlet of the fan are respectively connected to the first drying air duct and the second drying air duct, a first plug interface is provided on the first drying air duct, and a part of the filtering device passes through the first plug interface and extends into the first drying air duct.

[0017] In the preferred technical solution of the above-mentioned drying equipment, the filtering device includes an outer shell, a first bracket installed on the outer shell, a second bracket installed on the first bracket, and a filter installed on the second bracket, one end of the outer shell is connected to the first plug interface, the first bracket can move relative to the outer shell along the length direction of the outer shell, the first bracket and the second bracket are distributed along the length direction of the outer shell, a part of the second bracket and the filter pass through the first plug interface and extend into the first drying air duct, the second bracket can move relative to the first bracket along the length direction of the first bracket or the second bracket is detachably connected to the first bracket.

[0018] When the above technical solution is adopted, the fan of the utility model can make full use of the axial space of the fan by arranging a groove structure recessed along the axial direction of the fan on the volute to increase the cross-sectional area of ​​the exhaust passage, thereby increasing the air volume of the fan and further improving the drying efficiency of the drying equipment.

[0019] Furthermore, the utility model gradually increases and then gradually reduces the depth of the groove structure, thereby ensuring that the air volume is increased and the air outlet speed of the fan is increased, thereby further improving the drying efficiency of the drying equipment.

[0020] Furthermore, the utility model can match the depth change of the groove structure by changing the width of the exhaust channel in the order of gradually increasing, gradually decreasing and gradually increasing, which is beneficial to making the cross-sectional area of ​​the exhaust channel transition evenly, thereby preventing the formation of vortices, preventing the formation of local high-speed airflow areas, reducing pressure losses, ensuring the air volume of the fan, and further improving drying efficiency.

[0021] Furthermore, the utility model makes the first groove correspond to a part of the first channel and the second channel, and makes the second groove correspond to the third channel, so that the width change and the depth change of the exhaust channel are more matched and the air outlet effect is better.

[0022] Furthermore, the utility model provides a shell for the filter device and installs the filter assembly on the shell. When the filter needs to be cleaned, it is only necessary to pull out the filter assembly without removing the shell. In addition, by connecting one end of the shell with the first plug interface on the drying air duct, it is convenient to align the filter assembly with the first plug interface, thereby smoothly installing it and improving the user experience.

[0023] Furthermore, the filter assembly of the utility model includes a first bracket and a second bracket that can be detachably connected or movably connected, and the filter is installed on the second bracket. Through such an arrangement, when disassembling the filter device, the required disassembly space is smaller, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The preferred embodiment of the present invention is described below in conjunction with the accompanying drawings of a washer-dryer, in which:

[0025] Figure 1 It is a structural schematic diagram of the integrated washer-dryer of the utility model;

[0026] Figure 2 It is a schematic diagram of the assembly of the drying system and the drying drum of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the filtering device of the utility model;

[0028] Figure 4 It is a structural schematic diagram of a filter assembly of the filter device of the utility model;

[0029] Figure 5 This is a schematic diagram of the structure of the fan of the utility model Figure 1 ;

[0030] Figure 6 This is a schematic diagram of the structure of the fan of the utility model Figure 2 ;

[0031] Figure 7 This is a schematic diagram of the structure of the volute of the fan of the utility model Figure 1 ;

[0032] Figure 8 This is a schematic diagram of the structure of the volute of the fan of the utility model Figure 2 .

[0033] List of reference numerals:

[0034] 1. Box body; 11. Second plug interface;

[0035] 2. Drying drum; 21. Exhaust vent; 22. Take-in and put-out port;

[0036] 3. Filter device; 31. First bracket; 32. Second bracket; 33. Housing;

[0037] 41. first drying air duct; 42. second drying air duct; 411. first plug interface;

[0038] 5. fan; 51. volute; 52. impeller;

[0039] 511. first inner wall; 512. mounting plane; 513. exhaust passage; 514. groove structure; 515. air inlet; 516. air outlet; 521. blades. DETAILED DESCRIPTION

[0040] 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. For example, although the embodiments described below are described in conjunction with a washer-dryer, the technical solution of the present invention is also applicable to other drying devices with drying functions, such as dryers and care machines.

[0041] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "left", "right", "top", "bottom", "front", "back" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connect", and "install" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Specifically, Figure 1 and Figure 2 As shown, the washer-dryer of the present application includes a housing 1, a drying drum 2 installed in the housing 1, and a drying system, wherein the drying drum 2 is an outer drum of the washer-dryer, and a rotatable inner drum is arranged inside the outer drum, and the inner drum is used to accommodate clothes.

[0044] For example, Figure 2 As shown, the drying drum 2 is horizontally arranged, and the front end of the drying drum 2 is a loading and unloading port 22 for loading and unloading clothes. An exhaust port 21 is provided near the rear end of the drying drum 2, and the exhaust port 21 is connected with the air inlet end of the drying system. The air outlet end of the drying system extends to the loading and unloading port 22 of the drying drum 2. During the execution of the drying program, the humid air in the drying drum 2 enters the drying system from the exhaust port 21, and after condensation and heating by the drying system, re-enters the drying drum 2 from the loading and unloading port 22 to dry the clothes in the drying drum 2.

[0045] Preferably, if Figure 1 and Figure 2 As shown, the drying system of the present invention comprises a drying air duct and a filter device 3. A first plug interface 411 is provided on the drying air duct, and a part of the filter device 3 extends into the drying air duct through the first plug interface 411.

[0046] The filter device 3 is used to filter the airflow in the drying air duct and intercept impurities such as lint carried by the airflow. The filter device 3 is connected to the drying air duct by plugging. When the filter device 3 needs to be cleaned, the filter device 3 can be pulled out of the drying air duct and then inserted into the drying air duct from the first plug interface 411 after cleaning. The operation is very convenient.

[0047] Preferably, if Figure 1 As shown, the housing 1 of the washer-dryer of the present invention is provided with a second plug interface 11 at a position corresponding to the first plug interface 411 , the extension direction of the filter device 3 is parallel to the axial direction of the drying drum 2 of the washer-dryer, and the filter device 3 extends to the second plug interface 11 .

[0048] Exemplarily, the second plug interface 11 is disposed on the front panel of the housing 1 , and when the filter device 3 needs to be cleaned, the user can directly pull out the filter device 3 from the front panel.

[0049] Preferably, if Figure 1 and Figure 2 As shown, the drying air duct of the utility model includes a first drying air duct 41 and a second drying air duct 42. The two ends of the first drying air duct 41 are respectively connected to the exhaust port 21 on the drying drum 2 and the air inlet of the fan 5 of the drying system. The air outlet of the fan 5 is connected to one end of the second drying air duct 42. The other end of the second drying air duct 42 extends toward the loading and unloading port 22 of the drying drum 2. The first plug interface 411 is provided on the first drying air duct 41.

[0050] Preferably, if Figure 1 and Figure 2 As shown, the first drying air duct 41 and the second drying air duct 42 are located on the same side of the drying drum 2, and the extension direction of the first drying air duct 41 intersects with the extension direction of the second drying air duct 42.

[0051] By arranging the first drying air duct 41 and the second drying air duct 42 on the same side of the drying drum 2, illustratively, as Figure 1 and Figure 2 As shown, the first drying air duct 41 and the second drying air duct 42 are both located above the drying drum 2, which can fully utilize the space above the drying drum 2 without occupying the space behind the drying drum 2. The layout is more reasonable and occupies less space. In addition, the extension direction of the first drying air duct 41 is intersected with the extension direction of the second drying air duct 42, which can make more full use of the space above the drying drum 2 and is conducive to increasing the volume of the first drying air duct 41 and the second drying air duct 42.

[0052] It should be noted that, in actual applications, those skilled in the art may also arrange the first drying duct 41 and the second drying duct 42 entirely on the left side, right side or bottom of the drying drum 2. Such flexible adjustments and changes do not deviate from the principle and scope of the present utility model and should be limited within the protection scope of the present utility model.

[0053] In addition, it should be noted that the present invention does not limit the angle between the first drying air duct 41 and the second drying air duct 42, and those skilled in the art can flexibly set it according to specific circumstances in actual applications.

[0054] Preferably, if Figure 2 As shown, the angle between the first drying air duct 41 and the second drying air duct 42 is 80° to 100°. Further preferably, the angle between the first drying air duct 41 and the second drying air duct 42 is 90°.

[0055] The utility model preferably limits the angle between the first drying air duct 41 and the second drying air duct 42 to between 80° and 100°, for example, 80°, 85°, 90°, 95° or 100°, etc. Of course, it is most preferably limited to 90°, that is, the first drying air duct 41 and the second drying air duct 42 are arranged vertically.

[0056] Preferably, if Figure 2 As shown, the extension direction of the second drying air duct 42 is parallel to the axial direction of the drying cylinder 2 .

[0057] Exemplarily, the first drying air duct 41 and the second drying air duct 42 are located in the same horizontal plane, the second drying air duct 42 extends along the axial direction of the drying drum 2 , and the first drying air duct 41 is perpendicular to the second drying air duct 42 .

[0058] Preferably, if Figure 2 As shown, the extension direction of the second drying air duct 42 is perpendicular to the axial direction of the fan 5 .

[0059] By making the extension direction of the second drying air duct 42 parallel to the axial direction of the drying drum 2 and making the extension direction of the second drying air duct 42 perpendicular to the axial direction of the fan 5, the layout of the entire circulation air path is further optimized.

[0060] It should be noted that, in actual applications, those skilled in the art may set the exhaust port 21 on the side wall of the drying drum 2, or may set the exhaust port 21 on the rear wall of the drying drum 2, etc. Such adjustments and changes to the specific setting position of the exhaust port 21 do not deviate from the principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

[0061] Preferably, if Figure 2 As shown, the air outlet 21 is arranged on the side wall of the drying cylinder 2.

[0062] By arranging the air outlet 21 on the side wall of the drying cylinder 2 , it is convenient to connect the air outlet 21 with the first drying air duct 41 .

[0063] Preferably, if Figure 1 and Figure 3 As shown, the filter device 3 of the present application includes a housing 33 and a filter assembly installed on the housing 33 , and the filter assembly can move relative to the housing 33 along the length direction of the housing 33 .

[0064] The housing 33 is fixedly installed between the drying air duct and the housing 1, specifically, the housing 33 is fixedly installed between the first drying air duct 41 and the housing 1, and the two ends of the housing 33 are respectively connected with the first plug port 411 on the first drying air duct 41 and the second plug port 11 on the housing 1, and a part of the filter assembly extends into the drying air duct through the first plug port 411, specifically into the first drying air duct 41, and the filter assembly extends to the second plug port 11. When the filter device needs to be cleaned, it is only necessary to pull out the filter assembly without disassembling the housing 33 of the filter device. In addition, the extension direction of the housing 33 and the filter assembly is preferably parallel to the axial direction of the drying drum 2 of the drying device.

[0065] It should be noted that the housing 33 is not mandatory, and those skilled in the art may also cancel the housing 33 according to actual conditions in actual applications.

[0066] Preferably, if Figures 2 to 4 As shown, the filter assembly of the present invention includes a first bracket 31 , a second bracket 32 ​​installed on the first bracket 31 , and a filter screen (not shown in the figure) installed on the second bracket 32 ​​.

[0067] Among them, the first bracket 31 is installed on the shell 33 and can move relative to the shell 33 along the length direction of the shell 33. The first bracket 31 and the second bracket 32 ​​are distributed along the length direction of the shell 33. The extension directions of the first bracket 31 and the second bracket 32 ​​are parallel to the axial direction of the drying drum 2 of the washer-dryer. The first bracket 31 extends to the second plug interface 11, and the second bracket 32 ​​and the filter screen pass through the first plug interface 411 and extend into the drying air duct. Specifically, the second bracket 32 ​​and the filter screen pass through the first plug interface 411 and extend into the first drying air duct 41.

[0068] It should be noted that, in actual application, those skilled in the art can make the second bracket 32 ​​extend completely into the first drying air duct 41, or only make the second bracket 32 ​​with the filter installed extend into the first drying air duct 41, etc. Such flexible adjustment and change do not deviate from the principle and scope of the utility model and should be limited within the protection scope of the utility model. Of course, the utility model preferably makes only a part of the second bracket 32 ​​extend into the first drying air duct 41.

[0069] In addition, it should be noted that, in actual application, those skilled in the art can extend the entire filter screen into the first drying air duct 41, or only extend a portion of the filter screen into the first drying air duct 41, etc. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention. Of course, the present invention preferably extends the entire filter screen into the first drying air duct 41.

[0070] In the first preferred case, if Figure 4 As shown, the second bracket 32 ​​of the present invention can move relative to the first bracket 31 along the length direction of the first bracket 31 .

[0071] When the filter needs to be cleaned, first pull the first bracket 31 out of the box body 1. When the outer end of the second bracket 32 ​​moves to the outside of the box body 1 with the first bracket 31, keep the first bracket 31 stationary and pull the second bracket 32 ​​to move along the first bracket 31 until the filter is pulled out. In this way, when disassembling the filter device 3, the required lateral space is smaller, disassembly is more convenient, and it is easy to arrange the washer-dryer.

[0072] In the second preferred situation, the second bracket 32 ​​of the utility model is detachably connected to the first bracket 31 .

[0073] When the filter needs to be cleaned, first pull the first bracket 31 out of the box body 1. When the outer end of the second bracket 32 ​​moves to the outside of the box body 1 with the first bracket 31, disassemble the first bracket 31 and the second bracket 32, and then continue to pull the second bracket 32 ​​until the filter is pulled out. In this way, when disassembling the filter device 3, the required lateral space is smaller, disassembly is more convenient, and it is easy to arrange the washer-dryer.

[0074] Preferably, if Figures 5 to 8 As shown, the fan 5 of the utility model includes a volute 51 and an impeller 52 installed in the volute 51, the air inlet 515 and the air outlet 516 of the fan 5 are both arranged on the volute 51, and the impeller 52 is provided with a blade 521, and an exhaust passage 513 connected with the air outlet 516 is provided between the outer end of the blade 521 and the first inner wall 511 of the volute 51, and the outer end of the blade 521 is an end away from the center of the impeller 52, and the second inner wall of the volute 51 is provided with a groove structure 514 at a position corresponding to the exhaust passage 513, and the groove structure 514 is recessed toward the outer side of the volute 51 along the axial direction of the impeller 52 to increase the cross-sectional area of ​​the exhaust passage 513.

[0075] By providing a groove structure 514 recessed along the axial direction on the volute 51, the axial space of the fan 5 can be fully utilized to increase the cross-sectional area of ​​the exhaust passage 513, thereby increasing the air output of the fan 5 and further improving the drying efficiency of the drying equipment.

[0076] The first inner wall refers to the inner wall opposite to the blade 521 .

[0077] It should be noted that, in actual applications, those skilled in the art may set the groove structure 514 at all positions corresponding to the exhaust passage 513 , or may set the groove structure 514 only at part of the positions corresponding to the exhaust passage 513 .

[0078] In addition, it should be noted that, in actual applications, those skilled in the art may set the groove structure 514 on the inner wall of the volute 51 where the impeller 52 is installed, or may set the groove structure 514 on the inner wall opposite to the inner wall where the impeller 52 is installed, or may set the groove structure 514 on both inner walls. In other words, the second inner wall refers to the inner wall where the impeller 52 is installed and / or the inner wall opposite to the inner wall where the impeller 52 is installed.

[0079] Preferably, if Figures 6 to 8 As shown, the second inner wall is the inner wall of the volute 51 on which the impeller 52 is mounted.

[0080] That is, the groove structure 514 is disposed on the inner wall of the volute 51 on which the impeller 52 is mounted.

[0081] Exemplarily, the second inner wall of the volute 51 has an approximately circular mounting plane 512 , the impeller 52 is mounted on the mounting plane 512 , and the groove structure 514 is arranged around the mounting plane 512 .

[0082] Preferably, if Figure 7 and Figure 8 As shown, the groove structure 514 on the volute 51 includes a first groove and a second groove connected in sequence along the flow direction of the airflow, the second groove is connected to the air outlet 516 on the volute 51, the depression depth of the first groove gradually increases along the flow direction of the airflow, and the depression depth of the second groove gradually decreases along the flow direction of the airflow.

[0083] Exemplarily, point A1 is the starting point of the first groove, point A2 is the end point of the first groove and also the starting point of the second groove, point A3 (located at the air outlet 516) is the end point of the second groove, and from point A1 to point A2, the depression depth of the groove structure 514 gradually increases, and from point A2 to point A3, the depression depth of the groove structure 514 gradually decreases.

[0084] Preferably, the ratio of the length of the first groove to the total length of the groove structure 514 is 0.6 to 0.7; and the ratio of the length of the second groove to the total length of the groove structure 514 is 0.3 to 0.4.

[0085] The ratio of the length of the first groove to the total length of the groove structure 514 may be 0.6, 0.65 or 0.7, etc., and the ratio of the length of the second groove to the total length of the groove structure 514 may be 0.3, 0.35 or 0.4, etc.

[0086] It should be noted that, since the groove structure 514 is arc-shaped, the length of the groove structure 514 refers to its arc length.

[0087] Preferably, the recessed depth of the recessed structure 514 is no more than 30 mm.

[0088] Among them, those skilled in the art can set the recessed depth of the groove structure 514 to 5 mm, 10 mm, 15 mm, 20 mm, 25 mm or 30 mm, etc.

[0089] In addition, from the above introduction, it can be seen that the utility model preferably sets the depression depth of the groove structure 514 to change gradually. Taking the maximum depression depth of the groove structure 514 as 25mm as an example, the depression depth of the groove structure 514 gradually increases from 0mm to 25mm from A1 to A2, and the depression depth of the groove structure 514 gradually decreases from 25mm to 0mm from A2 to A3.

[0090] Preferably, if Figure 6 As shown, the exhaust channel 513 includes a first channel, a second channel and a third channel connected in sequence along the flow direction of the airflow, the third channel is connected to the air outlet 516 on the volute 51, the width of the first channel and the width of the third channel gradually increase along the flow direction of the airflow, and the width of the second channel gradually decreases along the flow direction of the airflow.

[0091] The width of the exhaust passage 513 refers to the distance between the first inner wall 511 of the volute 51 and the outer end of the blade 521 .

[0092] Exemplarily, point B1 is the starting point of the first channel, point B2 is the end point of the first channel and also the starting point of the second channel, point B3 is the end point of the second channel and also the starting point of the third channel, point B4 (located at the air outlet 516) is the end point of the third channel, and from point B1 to point B2, the width of the exhaust channel 513 gradually increases, from point B2 to point B3, the width of the exhaust channel 513 gradually decreases, and from point B3 to point B4, the width of the exhaust channel 513 gradually increases.

[0093] Preferably, the first groove corresponds to a portion of the first channel and the second channel, and the second groove corresponds to the third channel.

[0094] Specifically, combined Figure 6 and Figure 8 , point A1 is between B1 and B2, point B2 is between A1 and A2, and point A2 coincides with B3.

[0095] Preferably, the ratio of the length of the first channel to the total length of the exhaust channel 513 is 0.75 to 0.85; the ratio of the length of the second channel to the total length of the exhaust channel 513 is 0.05 to 0.07; the ratio of the length of the third channel to the total length of the exhaust channel 513 is 0.08 to 0.2.

[0096] Among them, the ratio of the length of the first channel to the total length of the exhaust channel can be 0.75, 0.80 or 0.85, etc., the ratio of the length of the second channel to the total length of the exhaust channel can be 0.05, 0.06 or 0.07, etc., and the ratio of the length of the third channel to the total length of the exhaust channel can be 0.08, 0.10, 0.15 or 0.2, etc.

[0097] It should be noted that, since the exhaust passage 513 is arc-shaped, the length of the exhaust passage 513 refers to the arc length thereof.

[0098] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0099] So far, the technical solution of the present invention has 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 fan, characterized in that: The fan includes a volute and an impeller installed in the volute, the impeller is provided with blades, an exhaust passage is provided between the outer end of the blade and the first inner wall of the volute, the outer end of the blade is an end away from the center of the impeller, and the second inner wall of the volute is provided with a groove structure at a position corresponding to the exhaust passage, and the groove structure is recessed toward the outer side of the volute along the axial direction of the impeller to increase the cross-sectional area of ​​the exhaust passage.

2. The fan according to claim 1, characterized in that: The groove structure includes a first groove and a second groove connected in sequence along the flow direction of the airflow, the second groove is connected to the air outlet of the volute, the depression depth of the first groove gradually increases along the flow direction of the airflow, and the depression depth of the second groove gradually decreases along the flow direction of the airflow.

3. The fan according to claim 2, characterized in that: The exhaust channel includes a first channel, a second channel and a third channel connected in sequence along the flow direction of the airflow, the third channel is connected to the air outlet, the width of the first channel and the width of the third channel gradually increase along the flow direction of the airflow, and the width of the second channel gradually decreases along the flow direction of the airflow.

4. The fan according to claim 3, characterized in that: The first groove corresponds to a portion of the first channel and the second channel, and the second groove corresponds to the third channel.

5. The fan according to claim 3, characterized in that: The ratio of the length of the first channel to the total length of the exhaust channel is 0.75 to 0.85; the ratio of the length of the second channel to the total length of the exhaust channel is 0.05 to 0.07; the ratio of the length of the third channel to the total length of the exhaust channel is 0.08 to 0.

2.

6. The fan according to claim 2, characterized in that: The ratio of the length of the first groove to the total length of the groove structure is 0.6 to 0.7; the ratio of the length of the second groove to the total length of the groove structure is 0.3 to 0.

4.

7. The fan according to any one of claims 1 to 6, characterized in that: The recessed depth of the groove structure is not greater than 30 mm; and / or The second inner wall is the inner wall of the volute on which the impeller is mounted.

8. A drying device, characterized in that: The drying equipment comprises the fan according to any one of claims 1 to 7.

9. The drying device according to claim 8, characterized in that: The drying system of the drying equipment includes a first drying air duct, a second drying air duct and a filtering device. The air inlet and air outlet of the fan are respectively connected to the first drying air duct and the second drying air duct. The first drying air duct is provided with a first plug interface. The filtering device includes an outer shell and a filtering component installed on the outer shell. One end of the outer shell is connected to the first plug interface. The filtering component can move relative to the outer shell along the length direction of the outer shell. A part of the filtering component passes through the first plug interface and penetrates into the first drying air duct.

10. The drying device according to claim 9, characterized in that: The filter assembly includes a first bracket installed on the outer shell, a second bracket installed on the first bracket, and a filter installed on the second bracket, the first bracket can move relative to the outer shell along the length direction of the outer shell, the first bracket and the second bracket are distributed along the length direction of the outer shell, a part of the second bracket and the filter pass through the first plug interface and extend into the first drying air duct, the second bracket can move relative to the first bracket along the length direction of the first bracket or the second bracket is detachably connected to the first bracket.

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