A dehumidifier

Abstract

The embodiment of the present application provides a dehumidifier, and relates to the technical field of household appliances. The dehumidifier comprises a shell, a centrifugal fan and a mesh cover. The mesh cover is arranged at an air outlet. The mesh cover is provided with a plurality of air guide ribs arranged along a preset direction. The preset direction is from a first end to a second end. The distance between the air guide ribs and a preset plane gradually increases from the air guide rib closest to an air inlet to the nth air guide rib in the direction of the air guide ribs. The high-speed air blown out of the centrifugal fan needs to pass through a long distance to be blown out of the dehumidifier through the air guide ribs. Therefore, the noise generated by the impact of the high-speed air on the air guide ribs on the mesh cover is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more specifically, to a dehumidifier. Background Technology

[0002] Dehumidifiers, also known as moisture extractors, dryers, or dehumidifiers, are generally divided into two main categories: residential dehumidifiers and industrial dehumidifiers, and are considered a member of the air-conditioned household. Typically, a conventional dehumidifier consists of a compressor, heat exchanger, fan, water tank, casing, and controller. Its working principle is as follows: the fan draws humid air into the machine, where it passes through the heat exchanger, where water molecules in the air condense into water droplets. The treated, dry air is then expelled from the machine, and this cycle continues to maintain a suitable relative humidity level indoors.

[0003] The inventors discovered that some existing dehumidifiers produce significant noise at their air outlets during operation. Summary of the Invention

[0004] The purpose of this invention is to provide a dehumidifier that can reduce the noise at the air outlet during operation.

[0005] The embodiments of the present invention are implemented as follows:

[0006] In a first aspect, the present invention provides a dehumidifier, comprising:

[0007] The housing has an air inlet and an air outlet;

[0008] Centrifugal fan, the centrifugal fan is installed in the housing, the centrifugal fan is used to guide the gas entering from the air inlet to the air outlet, the centrifugal fan has a first end and a second end that are spaced apart and opposite to each other along its own axis, the first end being closer to the air inlet than the second end;

[0009] A mesh cover is installed at the air outlet. The mesh cover has multiple air guide ribs arranged along a preset direction, from the first end to the second end. From the air guide rib closest to the air inlet to the nth air guide rib, the distance between the air guide ribs and the preset plane gradually increases. The preset plane is set directly opposite the air outlet. The axis of the centrifugal fan falls within the preset plane. The number of multiple air guide ribs is at least n.

[0010] With the above settings, the high-speed air blown out from the centrifugal fan needs to travel a longer distance before passing through the air guide ribs and being blown out of the dehumidifier. Therefore, it can effectively reduce the noise caused by the impact of the high-speed air with the air guide ribs on the mesh cover.

[0011] In an optional implementation, the number of air guide ribs is n.

[0012] With the above settings, the distance between the air guide ribs arranged in the preset direction and the preset plane gradually increases, which also reduces the force when the air guide ribs furthest from the air inlet come into contact with the high-speed wind, thereby reducing the generation of noise.

[0013] In an optional implementation, each air guide rib has a third end near the centrifugal fan, the third end has a preset point, and multiple preset points pass through a preset curve with a radius of curvature of R.

[0014] B, Q n and C 2u All are constants. A coordinate system is formed with the axis of the centrifugal fan as the abscissa and a preset straight line as the ordinate. The preset straight line is perpendicular to the axis and passes through both the air outlet and the center of the centrifugal fan. Let be the position angle of the air guide rib on the coordinate system.

[0015] By setting it up as described above, the distance between the air guide ribs and the preset plane gradually increases from the air guide rib closest to the air inlet to the nth air guide rib, thereby reducing the impact of high-speed winds on the air guide ribs and achieving the effect of reducing noise.

[0016] In an optional implementation, each air guide rib has a fourth end opposite to the third end, the line connecting the middle of the third end and the middle of the fourth end is the air guide line, the preset curve has a preset tangent at a preset point, and the air guide line of each air guide rib has a preset angle with the preset tangent at the corresponding preset point.

[0017] Multiple air guide ribs are divided into a first group and a second group, with the first group being far away from the air inlet. The air guide line of the first group and the corresponding preset tangent form a preset angle, which is the first angle. The air guide line of the second group and the corresponding preset tangent form a preset angle, which is the second angle. The first angle and the second angle are opposite to each other and away from the air inlet. Along the direction closer to the air inlet, the first angle and the second angle gradually increase.

[0018] With the above settings, different air guide ribs have different preset included angles β, which can expand the air outlet range, make the airflow smoother, and reduce air volume loss.

[0019] In an optional implementation, the first included angle ranges from 60° to 70°, and the second included angle ranges from 80° to 110°.

[0020] With the above settings, neither the first nor the second included angle is too large, which ensures that the air guide ribs can expand the air outlet range while also ensuring their own air guiding function.

[0021] In an optional implementation, the multiple air guide ribs are divided into a first group and a second group, with the second group being closer to the air inlet. The air guide ribs in the first group are inclined in a direction away from the air inlet, while the air guide ribs in the second group are inclined in a direction closer to the air inlet.

[0022] By setting the air guide ribs in the two sets to tilt in opposite directions, the air guide ribs on the mesh cover are widened, which can increase the air outlet angle and increase the air outlet range.

[0023] In an optional embodiment, in a preset direction, multiple air guide ribs are sequentially designated as the 1st, 2nd, ... to the nth air guide ribs. The minimum distance between the 1st air guide rib and the housing in the axial direction of the centrifugal fan is L1. In the preset direction, the distances between adjacent air guide ribs are sequentially designated as L2, L3, ..., L... n The minimum distance between the nth guide rib and the casing along the axial direction of the centrifugal fan is L. n+1 L n <L n-1 <...<L3<...<L1=L n+1 .

[0024] With the above settings, adjacent air guide ribs in areas with higher air velocity can be spaced closer together to guide the airflow, while adjacent air guide ribs in areas with lower air velocity can be spaced further apart to increase the airflow area.

[0025] In an optional implementation,

[0026] With the above settings, the spacing between adjacent air guide ribs decreases regularly in the preset direction, which reduces the difficulty of mold manufacturing.

[0027] In an optional implementation, the multiple air guide ribs are divided into a first group and a second group, with the second group being closer to the air inlet. The thickness of the air guide ribs in the first group is greater than the thickness of the air guide ribs in the second group.

[0028] The above settings enhance the strength of the air guide ribs in the first group.

[0029] In an optional implementation, the guide ribs in the first group have equal thickness, the guide ribs in the second group have equal thickness, and the thickness of the guide ribs in the first group is twice the thickness of the guide ribs in the second group.

[0030] The above settings further ensure the strength of the air guide ribs in the first group.

[0031] The beneficial effects of this invention are as follows: The dehumidifier provided by this invention includes a housing, a centrifugal fan, and a mesh cover. The mesh cover is located at the air outlet and has multiple guide ribs arranged in a preset direction, from the first end to the second end. The distance between the guide ribs and the preset plane gradually increases from the guide rib closest to the air inlet to the nth guide rib. The high-speed air blown from the centrifugal fan needs to travel a longer distance before passing through the guide ribs and exiting the dehumidifier. Therefore, it effectively reduces the noise generated by the impact of the high-speed airflow with the guide ribs on the mesh cover. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a cross-sectional schematic diagram of the dehumidifier after the housing and mesh cover are assembled, as provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the preset angle formed by the air guide line on the air guide rib of the dehumidifier provided in the embodiment of the present invention and the preset tangent on the corresponding preset curve;

[0035] Figure 3 This is a schematic diagram of the structure of an existing dehumidifier;

[0036] Figure 4 for Figure 3 A cross-sectional schematic diagram.

[0037] Icons: 1-Dehumidifier; 10-Shell; 11-Air inlet; 12-Air outlet; 20-Centrifugal fan; 21-First end; 22-Second end; 30-Mesh cover; 310-First group; 320-Second group; 31-Air guide ribs; 311-Third end; 312-Fourth end; 313-Air guide line; 40-Preset curve; 41-Preset tangent; β-Preset angle; a-Preset direction. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] The following describes in detail, with reference to the accompanying patent drawings, the specific structure of a dehumidifier provided by an embodiment of the present invention and the corresponding technical effects it brings.

[0045] Please refer to Figures 1-2 The dehumidifier 1 provided in this embodiment of the invention includes a housing 10, a centrifugal fan 20 and a mesh cover 30.

[0046] The housing 10 has an air inlet 11 and an air outlet 12. A centrifugal fan 20 is disposed inside the housing 10. The centrifugal fan 20 is used to guide the gas entering through the air inlet 11 to the air outlet 12. The centrifugal fan 20 has a first end 21 and a second end 22 that are spaced apart and opposite to each other along its own axis. The first end 21 is closer to the air inlet 11 than the second end 22.

[0047] The mesh cover 30 is set at the air outlet 12. The mesh cover 30 is provided with a plurality of air guide ribs 31 arranged along a preset direction a. The preset direction a is from the first end 21 to the second end 22. From the air guide rib 31 closest to the air inlet 11 to the nth air guide rib 31, the distance between the air guide rib 31 and the preset plane gradually increases. The preset plane is set directly opposite the air outlet 12, and the axis of the centrifugal fan 20 falls into the preset plane. The number of the plurality of air guide ribs 31 is at least n.

[0048] In this embodiment, the air outlet 12 faces upwards, so the preset plane is a horizontal plane. Of course, in some other optional embodiments, the air outlet 12 is not limited to facing upwards, but can also face other directions.

[0049] Please refer to Figures 1-2 It should be noted that the aforementioned preset horizontal plane is based on the normal placement of dehumidifier 1, that is, dehumidifier 1 is positioned as follows: Figure 1 In the neutral state, the preset plane is horizontal.

[0050] Under the action of the centrifugal fan 20, the gas will enter the impeller of the centrifugal fan 20 axially. After entering the impeller, the gas becomes radial. Due to the characteristics of the centrifugal fan 20 itself, the wind speed blown from the side closer to the first end 21 in the axial direction of the centrifugal fan 20 is lower than the wind speed blown from the side closer to the second end 22.

[0051] Understandably, a higher wind speed results in greater noise from the air guide ribs 31. Therefore, in this embodiment, the distance between the air guide ribs 31 and the preset plane gradually increases from the air guide rib 31 closest to the air inlet 11 to the nth air guide rib 31. That is, the distance between the nth air guide rib 31 and the preset plane is the largest. Therefore, from the air guide rib 31 closest to the air inlet 11 to the nth air guide rib 31, the high-speed air blown from the centrifugal fan 20 needs to travel a longer distance to pass through the air guide ribs 31 and be blown out of the dehumidifier 1. This effectively reduces the noise from the impact of high-speed air on the air guide ribs 31 on the mesh cover 30, and also avoids the simultaneous impact of high-speed and low-speed air on the mesh cover 30, further reducing noise.

[0052] And some existing dehumidifiers such as Figures 3-4As shown, the distance between the air guide ribs 31 in the mesh cover 30 and the horizontal plane where the highest point of the centrifugal fan 20 is located remains unchanged. Therefore, the high-speed air blown out by the centrifugal fan 20 has a large impact with the air guide ribs 31 in the mesh cover 30, resulting in a larger noise level.

[0053] In an optional embodiment, the number of air guide ribs 31 is n, that is, in the preset direction a, the distance between the multiple air guide ribs 31 and the preset plane gradually increases.

[0054] Of course, in some other alternative embodiments, the number of air guide ribs 31 can also be n+1 or n+1.

[0055] Furthermore, each air guide rib 31 has a third end 311 near the centrifugal fan 20. The third end 311 has a preset point, and multiple preset points pass through a preset curve 40 with a radius of curvature of R.

[0056] Among them, R2, B, Q n and C 2u All are constants. A coordinate system is formed with the axis of the centrifugal fan 20 as the abscissa and a preset straight line as the ordinate. The preset straight line is perpendicular to the axis and passes through both the air outlet 12 and the center of the centrifugal fan 20. Let R2 be the position angle of the guide rib 31 in the coordinate system. Specifically, R2 is the outer diameter of the impeller of the centrifugal fan 20, B is the width of the volute of the centrifugal fan 20, and Q is the position angle of the guide rib 31 in the coordinate system. n C is the flow rate of centrifugal fan 20. 2u Let be the circumferential velocity component of the airflow after leaving the centrifugal fan impeller 20. It is understandable that each... Each value can be used to obtain an R value. Connecting the points together will yield a preset curve 40.

[0057] It should be noted that, through the above formula, a preset curve 40 in the shape of a volute can be obtained, and the multiple air guide ribs 31 on the mesh cover 30 are also arranged in a roughly volute shape. This increases the distance between the multiple air guide ribs 31 and the preset plane in the preset direction a, from the air guide rib 31 closest to the air inlet 11 to the nth air guide rib 31, thereby reducing the impact of high-speed winds on the air guide ribs 31 and achieving the effect of noise reduction.

[0058] Furthermore, in this embodiment, the multiple air guide ribs 31 are divided into a first group 310 and a second group 320, wherein the second group 320 is closer to the air inlet 11, the air guide ribs 31 of the first group 310 are inclined in a direction away from the air inlet 11, and the air guide ribs 31 of the second group 320 are inclined in a direction closer to the air inlet 11.

[0059] Understandably, tilting the air guide ribs 31 in the two sets in opposite directions makes the two sets of air guide ribs 31 on the mesh cover 30 flare out, which can increase the air outlet angle of the air outlet 12 and increase the air outlet range.

[0060] Optionally, each air guide rib 31 has a fourth end 312 opposite to the third end 311. The line connecting the middle of the third end 311 and the middle of the fourth end 312 is the air guide line 313. The preset curve 40 has a preset tangent 41 at a preset point. The air guide line 313 of each air guide rib 31 and the preset tangent 41 at the corresponding preset point have a preset angle β, where the preset angle is denoted as β.

[0061] Multiple air guide ribs 31 are divided into a first group 310 and a second group 320, with the first group 310 being far away from the air inlet 11. The angle formed by the air guide line 313 of the air guide ribs 31 in the first group 310 and the corresponding preset tangent 41 is the first angle. The preset angle β formed by the air guide line 313 of the air guide ribs 31 in the second group 320 and the corresponding preset tangent 41 is the second angle. The orientation of the first angle and the orientation of the second angle are opposite and far away from the air inlet 11. Along the direction close to the air inlet 11, the first angle and the second angle gradually increase.

[0062] In other words, different air guide ribs 31 have different preset included angles β, which can expand the air outlet range of the air outlet 12, make the airflow smoother, and reduce air volume loss.

[0063] The first included angle ranges from 60° to 70°, and the second included angle ranges from 80° to 110°.

[0064] Understandably, in the preset direction a, the closer to the second end 22 of the centrifugal fan 20, the greater the air velocity of the centrifugal fan 20. Therefore, adjacent guide ribs 31 in areas with higher air velocity can be spaced smaller to guide the airflow, while adjacent guide ribs 31 in areas with lower air velocity can be spaced larger to increase the airflow area.

[0065] Therefore, the spacing between adjacent air guide ribs 31 in the first group 310 is smaller than the spacing between adjacent air guide ribs 31 in the second group 320.

[0066] Specifically, in the preset direction a, multiple air guide ribs 31 are sequentially designated as the 1st, 2nd, ... to the nth air guide rib 31. The initial distance between the 1st air guide rib 31 and the housing 10 along the axial direction of the centrifugal fan 20 is L1. In the preset direction a, the distances between adjacent air guide ribs 31 are sequentially designated as L2, L3, ..., L... n The minimum distance between the nth guide rib 31 and the casing 10 along the axial direction of the centrifugal fan 20 is L. n+1，Where L n <L n-1 <...>L3<...<L1=L n+1 .

[0067] Furthermore,

[0068] It can be seen that in the preset direction a, the spacing between adjacent air guide ribs 31 decreases according to the regular component, which can reduce the difficulty of mold manufacturing.

[0069] Furthermore, in this embodiment, the thickness of the air guide ribs 31 in the first group 310 is less than the thickness of the air guide ribs 31 in the second group 320. It is understood that in areas with lower air velocity, the air blown by the centrifugal fan 20 has a smaller impact on the air guide ribs 31; therefore, the air guide ribs 31 in these areas can be set to a smaller thickness without affecting their strength.

[0070] In areas with higher air velocity, the airflow blown by the centrifugal fan 20 exerts a greater force on the air guide ribs 31 on the mesh cover 30, so a larger thickness is set to enhance the strength of the mesh cover 30.

[0071] Furthermore, the thickness of the air guide ribs 31 in the first group 310 is equal, and the thickness of the air guide ribs 31 in the second group 320 is equal. The thickness of the air guide ribs 31 in the first group 310 is twice the thickness of the air guide ribs 31 in the second group 320.

[0072] In this group, the thickness of the first group 310 air guide rib 31 is denoted as H, and the thickness of the second group 320 air guide rib 31 is denoted as h, where H = 2h.

[0073] Of course, in some other embodiments, the thickness of the air guide ribs 31 in the first group 310 and the thickness of the air guide ribs 31 in the second group 320 can change sequentially. For example, in the preset direction a, the thickness of the air guide ribs 31 can gradually increase.

[0074] It should be noted that in this embodiment, the number of air guide ribs 31 is 8. Furthermore, the number of air guide ribs 31 in the first group 310 is the same as the number of air guide ribs 31 in the second group 320.

[0075] It should be noted that n can be 8, 7, or 6, etc., where the air inlet 11 is opposite to the first end 21.

[0076] The dehumidifier 1 also includes a water tank, a condenser, and a compressor. The condenser and compressor are located inside the housing 10, and the water tank is connected to the housing 10. The working principle of dehumidifier 1 is as follows: After the refrigerant is compressed by the compressor, it becomes a high-temperature and high-pressure refrigerant that flows to the condenser. The high-temperature and high-pressure refrigerant is cooled down on the condenser and becomes a low-temperature and high-pressure liquid. Then, the refrigerant passes through the throttling device and becomes a low-temperature and low-pressure liquid. Subsequently, the refrigerant flows to the evaporator. The low-temperature and low-pressure liquid refrigerant exchanges heat with the air on the evaporator. The refrigerant absorbs heat and causes the air to condense. The condensed water flows into the water tank through the preset flow path, thereby dehumidifying the air. The refrigerant is converted from liquid to low-pressure gas and flows back to the compressor. The dehumidified air is discharged through the air outlet 12 of the cover under the action of the fan. The fan can draw in the outside air from the air inlet 11 and, under the action of the centrifugal fan 20, the air is changed from the axial direction of the centrifugal fan 20 to the radial direction of the centrifugal fan 20. The air then passes through the air outlet 12 and is discharged from the dehumidifier 1 through the cover.

[0077] In summary, the dehumidifier 1 provided by this embodiment of the invention includes a housing 10, a centrifugal fan 20, and a mesh cover 30. The mesh cover 30 is disposed at the air outlet 12 and has a plurality of air guide ribs 31 arranged along a preset direction a. The preset direction a extends from the first end 21 to the second end 22. From the air guide rib 31 closest to the air inlet 11 to the nth air guide rib 31, the distance between the air guide ribs 31 and the preset plane gradually increases. The high-speed air blown out from the centrifugal fan 20 needs to travel a longer distance to pass through the air guide ribs 31 and be blown out of the dehumidifier 1. Therefore, it can effectively reduce the noise generated by the impact of the high-speed air with the air guide ribs 31 on the mesh cover 30.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dehumidifier, characterized in that, include: The housing (10) has an air inlet (11) and an air outlet (12). Centrifugal fan (20), the centrifugal fan (20) is disposed inside the housing (10), the centrifugal fan (20) is used to guide the gas entering through the air inlet (11) to the air outlet (12), the centrifugal fan (20) has a first end (21) and a second end (22) arranged at intervals along its own axis and opposite to each other, the first end (21) being closer to the air inlet (11) than the second end (22); A mesh cover (30) is provided at the air outlet (12). The mesh cover (30) is provided with a plurality of air guide ribs (31) arranged along a preset direction (a). The preset direction (a) is from the first end (21) toward the second end (22). From the air guide rib (31) closest to the air inlet (11) to the nth air guide rib (31), the distance between the air guide rib (31) and the preset plane gradually increases. The preset plane is set directly opposite the air outlet (12). The axis of the centrifugal fan (20) falls into the preset plane. The number of the plurality of air guide ribs (31) is at least n. The multiple air guide ribs (31) are divided into a first group (310) and a second group (320), with the second group (320) being closer to the air inlet (11). The air guide ribs (31) in the first group (310) are inclined in a direction away from the air inlet (11), while the air guide ribs (31) in the second group (320) are inclined in a direction closer to the air inlet (11).

2. The dehumidifier according to claim 1, characterized in that: The number of the air guide ribs (31) is n.

3. The dehumidifier according to claim 1, characterized in that: Each of the aforementioned air guide ribs (31) has a third end (311) near the centrifugal fan (20), the third end (311) having a preset point, and multiple preset points passing through a preset curve (40), the radius of curvature of the preset curve (40) being R. R= Among them, R2, B, and All are constants. A coordinate system is formed with the axis of the centrifugal fan (20) as the abscissa and a preset straight line as the ordinate. The preset straight line is perpendicular to the axis and passes through both the air outlet (12) and the center of the centrifugal fan (20). The position angle of the air guide rib (31) in the coordinate system.

4. The dehumidifier according to claim 3, characterized in that: Each of the air guide ribs (31) has a fourth end (312) opposite to the third end (311). The line connecting the middle of the third end (311) and the middle of the fourth end (312) is the air guide line (313). The preset curve (40) has a preset tangent (41) at the preset point. The air guide line (313) of each of the air guide ribs (31) has a preset angle (β) with the preset tangent (41) at the corresponding preset point. The multiple air guide ribs (31) are divided into a first group (310) and a second group (320), with the first group (310) being far away from the air inlet (11). The air guide line (313) of the air guide ribs (31) of the first group (310) and the corresponding preset tangent (41) form a preset angle (β), which is the first angle. The air guide line (313) of the air guide ribs (31) of the second group (320) and the corresponding preset tangent (41) form a preset angle (β), which is the second angle. The orientation of the first angle is opposite to the orientation of the second angle and away from the air inlet (11). Along the direction close to the air inlet (11), the first angle and the second angle gradually increase.

5. The dehumidifier according to claim 4, characterized in that: The first included angle ranges from 60° to 70°, and the second included angle ranges from 80° to 110°.

6. The dehumidifier according to claim 1, characterized in that: In the preset direction (a), the plurality of air guide ribs (31) are sequentially referred to as the 1st, 2nd... to nth air guide ribs (31). The minimum distance between the 1st air guide rib (31) and the housing (10) in the axial direction of the centrifugal fan (20) is L1. In the preset direction (a), the distances between adjacent air guide ribs (31) are sequentially referred to as L2, L3, ..., L n The minimum distance between the nth air guide rib (31) and the housing (10) in the axial direction of the centrifugal fan (20) is L. n+1 The L n <L n-1 <...<L3<...<L1=L n+1 .

7. The dehumidifier according to claim 6, characterized in that: = =... =1.1。 8. The dehumidifier according to claim 1, characterized in that... : The multiple air guide ribs (31) are divided into a first group (310) and a second group (320), with the second group (320) being closer to the air inlet (11). The thickness of the air guide ribs (31) in the first group (310) is greater than the thickness of the air guide ribs (31) in the second group (320).

9. The dehumidifier according to claim 8, characterized in that: The thickness of the air guide ribs (31) in the first group (310) is equal, and the thickness of the air guide ribs (31) in the second group (320) is equal. The thickness of the air guide ribs (31) in the first group (310) is twice the thickness of the air guide ribs (31) in the second group (320).

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