A dehumidifier

By designing a detachable heating air outlet device and dehumidification unit, the problem of poor dehumidification effect of existing dehumidifiers in small spaces is solved, effective dehumidification in small spaces such as drawers or cabinets is achieved, and multiple configurations are provided through stacking. The dehumidification unit is repeatedly used to solve the problem of large volume.

CN113289465BActive Publication Date: 2024-12-27GREE ELECTRIC APPLIANCE INC OF ZHUHAI
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Patent Information

Application Number
CN202110708273.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-06-24
Publication Date
2024-12-27
Estimated Expiration
2041-06-24

AI Technical Summary

Technical Problem

The existing recyclable dehumidifiers are large in size and are difficult to effectively dehumidify in small spaces such as drawers and cabinets.

Method used

A detachable dehumidifier is designed, including a heating air outlet device and a dehumidification unit. Through the disassembly connection between the heating air outlet device and the dehumidification unit, the contact between the air chamber and the outside world is realized, moisture is absorbed, and multiple dehumidifications are arranged through stacking. The unit is heated and dehydrated to reduce the number of parts and volume.

Benefits of technology

The dehumidification effect in a small space is achieved. At the same time, due to the simple structure, the few parts and the small volume, multiple dehumidification units can be used repeatedly, overcoming the defects of large volume in the prior art.

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Abstract

The dehumidifier provided by the present invention relates to the technical field of dehumidification and drying, and includes: a heating air outlet device, which has a built-in heating element and an air outlet, and an air outlet is arranged on one side thereof, suitable for discharging hot air; at least one dehumidification unit, which is detachably stacked on the air outlet, and the dehumidification unit includes an air passage cavity and a drying unit, and the air passage cavity is connected to the air outlet, and the drying unit is suitable for dehydration under the action of the hot air discharged from the air outlet. The dehumidification unit can be independently arranged relative to the heating air outlet device, and the number of parts in the dehumidification unit is small, and the volume is small, so that it can be placed in a small space to absorb moisture in the space, and at the same time, multiple dehumidification units are arranged in a stacked manner to heat and dehydrate multiple drying units after absorbing moisture, so as to realize repeated use of the drying units.
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Description

Technical Field

[0001] The invention relates to the technical field of dehumidification and drying, and in particular to a dehumidifier. Background Art

[0002] The main principle of dehumidifiers currently on the market is to extract air from the environment through a suction fan, and use a built-in desiccant to absorb the moisture in the extracted gas, thereby achieving a dehumidification effect. Dehumidifiers usually include two types: disposable and reusable.

[0003] Among them, the reusable dehumidifier achieves dehydration of the desiccant through internal heating, thereby achieving repeated use of the dehumidifier, saving energy and being environmentally friendly, and having a high material utilization rate. However, in the prior art, the reusable dehumidifier has a large volume and requires many internal parts, making it difficult to achieve effective dehumidification in small spaces such as drawers and cabinets. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the recyclable dehumidifier is large in size and difficult to dehumidify a small space, thereby providing a dehumidifier.

[0005] This embodiment provides a dehumidifier, comprising: a heating and air outlet device, which has a built-in heating element and an air outlet element, and an air outlet is provided on one side thereof, suitable for discharging hot air;

[0006] At least one dehumidification unit is detachably stacked on the air outlet, and the dehumidification unit includes an air passage cavity and a drying unit. The air passage cavity is connected to the air outlet, and the drying unit is suitable for achieving dehydration under the action of hot air discharged from the air outlet.

[0007] The dehumidification unit comprises: the air passage cavity comprises a first outer wall and a second outer wall respectively provided with a plurality of air passage holes;

[0008] A connecting piece, arranged on the air passage cavity, suitable for connecting the heating air outlet device, or the dehumidification unit arranged adjacently;

[0009] The drying unit is arranged in the air passage cavity and is suitable for absorbing moisture in the air.

[0010] The second outer wall is arranged toward the air outlet, and the first outer wall and the second outer wall are of the same shape and arranged in parallel.

[0011] The air holes are evenly distributed along the first outer wall and the second outer wall.

[0012] The drying unit comprises a shell, which is arranged in a receiving hole on the air passage cavity and is snap-connected with the receiving hole. A plurality of ventilation holes are arranged on the bottom wall of the shell facing the air passage cavity, and a desiccant is suitable for being arranged in the shell.

[0013] The accommodating hole is arranged on the first outer wall, the top wall of the shell is flush with the first outer wall and is transparent, and at least part of the desiccant is a color-changing silica gel desiccant.

[0014] The connecting member includes a magnetic member, which is arranged on the air passage cavity and is suitable for connecting adjacent dehumidification units or the heating air outlet device under the action of magnetic force.

[0015] The magnetic component is arranged at the center of the air passage cavity and is respectively engaged with the accommodating grooves arranged on the first outer wall and the second outer wall.

[0016] The connecting member further comprises: at least two protrusions evenly distributed on the second outer wall;

[0017] At least two groove members correspond to the protrusion members and are arranged on the first outer wall.

[0018] The heating air outlet device comprises: a cylinder, the top side of which is provided with the air outlet, a frame is provided along the air outlet, and at least two groove members are correspondingly provided on the frame;

[0019] The air outlet member is arranged at the bottom side of the air outlet and is suitable for discharging air toward the air outlet;

[0020] The heating element is disposed between the air outlet element and the air outlet, and is suitable for heating the airflow blown out by the air outlet element;

[0021] The dehumidifier further comprises a sealing structure, wherein the sealing structure comprises:

[0022] A second annular groove is arranged on the second outer wall, the opening of which is arranged facing away from the air passage cavity, and the air passage hole is arranged on the inner side of the second annular groove;

[0023] A first annular groove is provided on the first outer wall and the frame, the opening of which is provided toward the second annular groove, the air hole is provided inside the first annular groove, and a sealing annular groove is formed between the first annular groove and the second annular groove on the adjacent dehumidification unit;

[0024] A sealing ring is arranged in the sealing ring groove.

[0025] The technical solution of the present invention has the following advantages:

[0026] 1. The dehumidifier provided by the present invention includes: a heating air outlet device, which has a heating element and an air outlet element built in, and an air outlet is arranged on one side of the heating element, suitable for discharging hot air; at least one dehumidification unit, which is detachably stacked on the air outlet, and the dehumidification unit includes an air passage cavity and a drying unit, the air passage cavity is connected to the air outlet, and the drying unit is suitable for achieving dehydration under the action of the hot air discharged from the air outlet.

[0027] By dividing the heating and dehumidifying device and the dehumidifying unit into two detachable parts, on the one hand, the dehumidifying unit is detachably connected to the heating and air outlet device, and the dehumidifying unit can be independently arranged relative to the heating and air outlet device, which includes an air passage cavity and a drying unit. The drying unit can contact the outside world through the air passage cavity to absorb moisture from the outside world. On the other hand, the dehumidifying unit has fewer parts, a simple structure, and a small size. It can be placed in a small space, such as a drawer or a cabinet, to absorb moisture from the space. At the same time, multiple dehumidifying units are arranged in a stacked manner, connected to the air outlet of the heating and air outlet device through the air passage cavity, and multiple drying units that have absorbed moisture are heated and dehydrated to achieve repeated use of the drying units. This arrangement effectively overcomes the defects of the prior art that the recyclable dehumidifiers are large in size and difficult to dehumidify small spaces.

[0028] 2. In the dehumidifier provided by the present invention, the second outer wall is arranged toward the air outlet, and the first outer wall and the second outer wall are of the same shape and are arranged in parallel.

[0029] When the dehumidification unit is arranged on the air outlet, such arrangement facilitates the connection between the air outlet and the air holes on the second outer wall, so that the hot air discharged from the heating air outlet device passes through the air cavity and the drying unit to achieve dehydration. At the same time, the first outer wall and the second outer wall that are arranged in the same shape and in parallel are more convenient for the connection and installation of multiple dehumidification units when they are stacked. At the same time, it is also beneficial to the connection and sealing of the air cavities between the dehumidification units.

[0030] 3. In the dehumidifier provided by the present invention, a plurality of the air holes are evenly distributed along the first outer wall and the second outer wall.

[0031] The uniform distribution of air holes on each outer wall makes the airflow more stable and uniform, and also facilitates the effective contact between the drying unit and the external airflow in all directions, thereby improving the water absorption and dehydration efficiency of the drying unit. At the same time, the air holes on different outer walls are distributed in a corresponding manner. This arrangement can avoid blockage caused by the staggered arrangement of air holes when multiple dehumidification units are stacked, thereby ensuring the smooth dehydration of air.

[0032] 4. In the dehumidifier provided by the present invention, the accommodating hole is arranged on the first outer wall, the top wall of the shell is flush with the first outer wall and is transparent, and the desiccant is at least partially a color-changing silica gel desiccant.

[0033] By setting the top wall of the shell to be transparent and setting part of the desiccant to be color-changing silica gel desiccant, the user can observe the color of the desiccant through the top wall, and then quickly and conveniently determine the water absorption of the desiccant, and then determine whether dehydration is required or whether the dehydration is complete.

[0034] 5. In the dehumidifier provided by the present invention, the connecting member further comprises: at least two protrusions evenly distributed on the second outer wall; and at least two grooves corresponding to the protrusions and arranged on the first outer wall.

[0035] The coordinated arrangement of the protrusions and the grooves can connect adjacent dehumidification units along a fixed coordination angle. This arrangement can ensure that the air holes on the first outer wall and the second outer wall can be distributed one-to-one, thereby ensuring the air passing effect of the air cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the internal structure of a dehumidifier provided in an embodiment of the present invention;

[0038] Figure 2 for Figure 1 Another schematic diagram of the internal structure of the dehumidifier shown;

[0039] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the dehumidifier shown;

[0040] Figure 4 for Figure 1 A schematic diagram of the three-dimensional structure of the heating air outlet device of the dehumidifier shown;

[0041] Figure 5 for Figure 1 A schematic diagram of the internal structure of a dehumidifier unit of the dehumidifier shown;

[0042] Description of reference numerals:

[0043] 1. Heating and air outlet device; 2. Dehumidification unit; 11. Heating element; 12. Air outlet element; 13. Cylinder; 131. Air outlet; 132. Frame; 21. Air passage cavity; 211. First outer wall; 212. Second outer wall; 213. Air passage hole; 214. Accommodation hole; 22. Drying unit; 221. Shell; 222. Ventilation hole; 23. Connecting element; 231. Magnetic element; 232. Protruding element; 233. Grooved element; 3. Sealing structure; 31. First annular groove; 32. Second annular groove; 33. Sealing ring. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to 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", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] like Figure 1 - Figure 5 As shown, this embodiment provides a dehumidifier, including a heating air outlet device 1 and at least one dehumidification unit 2.

[0049] The heating air outlet device 1 comprises a cylinder 13, an air outlet member 12 and a heating member 11. Specifically, the cylinder 13 is arranged in a truncated cone shape, with an air outlet 131 arranged on the top, an air inlet and three legs arranged on the bottom, and an air outlet member 12 and a heating member 11 are arranged in the cylinder 13. The heating member 11 is preferably a metal heating strip arranged in a spiral or concentric circle shape, and the air outlet member 12 is preferably a fan. The heating member 11 is arranged between the fan and the air outlet 131. The fan is arranged adjacent to the air inlet, and can blow out the hot air flow heated by the heating member 11.

[0050] The dehumidifier includes four dehumidification units 2, each of which is detachably stacked on the air outlet 131. In this embodiment, each dehumidification unit 2 and the dehumidification unit 2 and the heating air outlet device 1 are detachable. The dehumidification unit 2 includes an air passage cavity 21 and a drying unit 22. The drying unit 22 is arranged in the air passage cavity 21, and the air passage cavity 21 is connected to the air outlet 131. The drying unit 22 is suitable for achieving dehydration under the action of hot air discharged from the air outlet 131. As a convertible embodiment, one, two or more dehumidification units 2 can be arranged on the dehumidifier.

[0051] By dividing the heating and dehumidifying device and the dehumidifying unit 2 into two detachable parts, on the one hand, the dehumidifying unit 2 is detachably connected to the heating and air outlet device 1, and the dehumidifying unit 2 can be independently set relative to the heating and air outlet device 1, which includes an air passage chamber 21 and a drying unit 22. The drying unit 22 can contact the outside world through the air passage chamber 21 to absorb moisture from the outside. On the other hand, the dehumidifying unit 2 has a small number of parts, a simple structure, and a small volume. It can be placed in a small space, such as a drawer or a cabinet, to absorb moisture in the space. At the same time, multiple dehumidifying units 2 are arranged in a stacked manner, connected to the air outlet 131 in the heating and air outlet device 1 through the air passage chamber 21, and multiple drying units 2 that have absorbed moisture are heated and dehydrated, so that the drying units 22 can be repeatedly used. This arrangement effectively overcomes the defects of the prior art that the recyclable dehumidifier is large in volume and difficult to dehumidify a small space.

[0052] Furthermore, the dehumidification unit 2 includes an air passage cavity 21, a connector 23 and a drying unit 22. The specific shape of the air passage cavity 21 is not restricted too much, and it only needs to satisfy the one-way air passage and be connected to the heating air outlet device 1. As a preferred embodiment, the air passage cavity 21 is arranged in a short cylindrical shape, and its top surface is a first outer wall 211, and its bottom surface is a second outer wall 212, and a plurality of air passage holes 213 are arranged on both surfaces; the connector 23 is arranged on the air passage cavity 21, and can connect the adjacent dehumidification unit 2, and can also connect the dehumidification unit 2 and the heating air outlet device 1. The drying unit 22 is arranged in the air passage cavity 21, and can absorb moisture in the air.

[0053] In this embodiment, the second outer wall 212 is arranged toward the air outlet 131, and the first outer wall 211 and the second outer wall 212 are arranged in the same shape and in parallel. When the dehumidification unit 2 is arranged on the air outlet 131, such an arrangement facilitates the connection between the air outlet 131 and the air hole 213 on the second outer wall 212, and then the hot air from the heating air outlet device 1 passes through the air cavity 21 and the drying unit 22 to achieve dehydration. At the same time, the first outer wall 211 and the second outer wall 212 arranged in the same shape and in parallel are more convenient for the connection and installation of multiple dehumidification units 2 when stacked, and at the same time, it is also conducive to the connection and sealing of the air cavity 21 between each dehumidification unit 2.

[0054] In this embodiment, a plurality of air holes 213 are evenly distributed on the first outer wall 211 and the second outer wall 212, and at the same time, the air holes 213 on the first outer wall 211 and the second outer wall 212 are correspondingly arranged. The even distribution of the air holes 213 on each outer wall makes the air flow more stable and uniform, and at the same time facilitates the effective contact between the drying unit 22 and the external air flow in all directions, thereby improving the water absorption and dehydration efficiency of the drying unit 22; at the same time, the air holes 213 on different outer walls are correspondingly distributed, and such an arrangement can avoid blockage caused by the staggered arrangement of the air holes 213 when multiple dehumidification units 2 are stacked, thereby ensuring the smooth progress of air flow dehydration.

[0055] The drying unit 22 includes a shell 221 and a built-in desiccant. In the present embodiment, a receiving hole 214 is provided on the first outer wall 211, and a portion of the receiving hole 214 extends toward the air passage chamber 21. The shell 221 includes an inverted bowl shell and a receiving plate provided with a plurality of ventilation holes 222. A plurality of claws with barbs are provided on the lower edge of the bowl shell, and the claws are engaged with the receiving port provided toward the air passage chamber 21, and the receiving plate is clamped and fixed in the receiving hole 214. In addition, a desiccant is placed in the receiving space formed by the bowl shell and the receiving plate, and the desiccant can absorb moisture from the air flow circulating in the air passage chamber 21 through the ventilation holes 222.

[0056] Furthermore, the top wall of the bowl shell on the housing 221 is flush with the first outer wall 211 and is transparent, and at least part of the desiccant is a color-changing silica gel desiccant. By setting the top wall of the housing 221 to be transparent and setting part of the desiccant to be a color-changing silica gel desiccant, the user can observe the color of the desiccant through the top wall, and then quickly and conveniently determine the amount of water absorbed by the desiccant, and then determine whether dehydration is required or whether the dehydration is complete. As a convertible embodiment, the peripheral side walls of the air passage chamber 21 and the side walls of the receiving hole 214 and the bowl shell can all be set to a transparent color, and the internal desiccant can be observed from the side.

[0057] The connecting member 23 includes a magnetic member 231, which is disposed on the air passage cavity 21 and can connect adjacent dehumidification units 2 under the action of magnetic force, or connect the dehumidification unit 2 and the heating air outlet device 1. In this embodiment, the magnetic member 231 is a permanent magnet disposed in a cylindrical shape, disposed at the center of the air passage cavity 21, and is respectively engaged with the receiving grooves disposed on the first outer wall 211 and the second outer wall 212.

[0058] As a convertible embodiment, two small magnetic parts 231 can be provided, which are respectively fixed in the receiving grooves on the first outer wall 211 and the second outer wall 212. In addition, one of the two small magnetic parts 231 can also be set to a magnetic metal, such as iron, cobalt, nickel, manganese, etc.

[0059] In addition, the connecting member 23 also includes three equally arranged protrusions 232 and three grooves 233, the three protrusions 232 being evenly distributed on the second outer wall 212, and the three grooves 233 being arranged on the first outer wall 211 corresponding to the positions of the protrusions 232. As a convertible embodiment, the number of the protrusions 232 and the grooves 233 can be two or more.

[0060] Furthermore, a frame 132 is provided on the top side air outlet 131 of the heating air outlet device 1. The frame 132 is provided in the shape of a circular ring sheet, including a plurality of concentric rings and support rods connecting the concentric rings. The frame 132 is provided with three groove members 233 of the same shape as those on the connecting member 23, which can cooperate with the protrusion member 232 on the second outer wall 212 on the bottom side of the dehumidification unit 2.

[0061] In addition, the dehumidifier further includes a sealing structure 3, which includes a first annular groove 31, a second annular groove 32 and a sealing ring 33, wherein the second annular groove 32 is arranged on the second outer wall 212 and is arranged concentrically with the second outer wall 212 arranged in a circular shape, the opening of the second annular groove 32 faces away from the air passage cavity 21 and downwards, and the air passage holes 213 on the second outer wall 212 are all arranged on the inner side of the second annular groove 32;

[0062] The first annular groove 31 is respectively arranged on the first outer wall 211 and the frame 132, and the opening is arranged toward the second annular groove 32. The air holes 213 on the first outer wall 211 are all arranged on the inner side of the first annular groove 31. The first annular groove 31 and the second annular groove 32 on the adjacent dehumidification unit 2 are formed with a sealing annular groove, and an elastic rubber sealing ring 33 is arranged in the sealing annular groove, which can strengthen the sealing between the two adjacent dehumidification units 2 after connection and between the dehumidification unit 2 and the heating air outlet device 1, thereby improving the dehydration effect of each drying unit 22.

[0063] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A dehumidifier, characterized in that: include: A heating air outlet device (1) having a heating element (11) and an air outlet element (12) built therein, and an air outlet (131) is provided on one side thereof, suitable for discharging hot air; A plurality of dehumidification units (2) are detachably stacked on the air outlet (131); the dehumidification units (2) comprise an air passage cavity (21) and a drying unit (22); the air passage cavity (21) is arranged in communication with the air outlet (131); the drying unit (22) is suitable for achieving dehydration under the action of hot air discharged from the air outlet (131); and the dehumidification units (2) are detachable from each other; The air passage cavity (21) comprises a first outer wall (211) and a second outer wall (212) each provided with a plurality of air passage holes (213); the second outer wall (212) is arranged toward the air outlet (131); the first outer wall (211) and the second outer wall (212) are of the same shape and are arranged in parallel; the drying unit (22) is arranged in the air passage cavity (21) and is suitable for absorbing moisture in the air; The dehumidification unit (2) further comprises: The connecting piece (23) is arranged on the air passage cavity (21) and is suitable for connecting to the heating air outlet device (1) or the adjacently arranged dehumidification unit (2).

2. The dehumidifier according to claim 1, characterized in that: The plurality of air holes (213) are evenly distributed along the first outer wall (211) and the second outer wall (212).

3. The dehumidifier according to any one of claims 1 to 2, characterized in that: The drying unit (22) comprises a shell (221), the shell (221) being arranged in a receiving hole (214) on the air passage cavity (21) and being snap-connected with the receiving hole (214), a plurality of ventilation holes (222) being arranged on a bottom wall of the shell (221) facing the air passage cavity (21), and a desiccant being suitable for being arranged in the shell (221).

4. The dehumidifier according to claim 3, characterized in that: The accommodating hole (214) is arranged on the first outer wall (211); the top wall of the housing (221) is flush with the first outer wall (211) and is transparent; and at least part of the desiccant is a color-changing silica gel desiccant.

5. The dehumidifier according to any one of claims 1 to 2 or 4, characterized in that: The connecting member (23) comprises a magnetic member (231), and the magnetic member (231) is arranged on the air passage cavity (21) and is suitable for connecting an adjacent dehumidification unit (2) or the heating air outlet device (1) under the action of magnetic force.

6. The dehumidifier according to claim 5, characterized in that: The magnetic member (231) is arranged at a central position in the air passage cavity (21), and is respectively engaged and connected with the accommodating grooves arranged on the first outer wall (211) and the second outer wall (212).

7. The dehumidifier according to claim 5, characterized in that: The connecting member (23) further comprises: At least two protrusions (232) evenly distributed on the second outer wall (212); At least two groove members (233) correspond to the protruding members (232) and are arranged on the first outer wall (211).

8. The dehumidifier according to claim 1, characterized in that: The heating air outlet device (1) comprises: A cylinder (13), the top side of which is provided with the air outlet (131), a frame (132) is provided along the air outlet (131), and at least two groove members (233) are correspondingly provided on the frame (132); The air outlet member (12) is arranged at the bottom side of the air outlet (131) and is suitable for discharging air towards the air outlet (131); The heating element (11) is arranged between the air outlet element (12) and the air outlet (131), and is suitable for heating the airflow blown out by the air outlet element (12).

9. The dehumidifier according to claim 1, characterized in that: It also includes a sealing structure (3), wherein the sealing structure (3) includes: A second annular groove (32) is arranged on the second outer wall (212), the opening of which is arranged facing away from the air passage cavity (21), and the air passage hole (213) is arranged on the inner side of the second annular groove (32); A first annular groove (31) is arranged on the first outer wall (211) and the frame (132), the opening of which is arranged toward the second annular groove (32), the air hole (213) is arranged on the inner side of the first annular groove (31), and the first annular groove (31) and the second annular groove (32) on the adjacent dehumidification unit (2) are formed with a sealing annular groove; A sealing ring (33) is arranged in the sealing ring groove.