Air gathering nozzle

Abstract

The air gathering nozzle comprises an outer shell and an inner shell, the outer shell is in a hollow shape with the two ends open, the inner shell is arranged in the outer shell, and a circumferential gap is formed between the inner shell and the outer shell; the inner shell comprises an air inlet shell body and an air outlet shell body which are arranged in a split mode and fixed to each other, the air inlet shell body and the air outlet shell body are each in a hollow shape with the two ends open, and the air inlet shell body and the air outlet shell body are arranged in the through direction of the outer shell and spliced to form an air guide cavity. An opening in the end, away from the air outlet shell, of the air inlet shell forms an air inlet, and an opening in the end, away from the air inlet shell, of the air outlet shell forms an air outlet. Through the double-layer design, the temperature of the outer side of the air gathering nozzle can be prevented from being too high, and meanwhile machining and assembling are facilitated through the part disassembling mode.

Description

Technical Field

[0001] The present application relates to the technical field of hair dryers, and in particular to an air focusing nozzle. Background Art

[0002] The air concentrator is a basic air nozzle that is currently equipped with hair dryers. It can make more accurate styling for local hair. Since the air outlet of the air concentrator is small, it often makes the wind speed faster and the wind force stronger. In order to make a good shape, the air concentrator is often used with high temperature. That is, when the air concentrator is used, the hair dryer is in hot air mode. The air concentrator is affected by the high temperature, resulting in a high surface temperature, which can easily burn the user. Utility Model Content

[0003] The main purpose of the present application is to propose an air concentrator, which aims to adopt a double-layer design to avoid excessive temperature on the outside of the air concentrator, while facilitating processing and assembly by disassembling parts.

[0004] To achieve the above-mentioned purpose, the present application proposes a wind concentrator, comprising an outer shell and an inner shell, wherein the outer shell is hollow with two ends open, and the inner shell is arranged inside the outer shell and a circumferential gap is formed between the inner shell and the outer shell;

[0005] The inner shell includes an air inlet shell and an air outlet shell which are separately arranged and fixed to each other. The air inlet shell and the air outlet shell are both hollow with openings at both ends. The air inlet shell and the air outlet shell are arranged along the through direction of the outer shell and are spliced ​​with each other to form an air guide cavity. The opening at one end of the air inlet shell facing away from the air outlet shell constitutes an air inlet, and the opening at one end of the air outlet shell facing away from the air inlet shell constitutes an air outlet.

[0006] Optionally, the air inlet housing and the air outlet housing are detachably connected.

[0007] Optionally, one of the end faces of the air inlet shell and the air outlet shell is provided with an inserting rib, and the other is provided with an inserting groove for the inserting rib to be inserted into, and the inserting rib and the inserting groove respectively extend in a ring shape along the circumference of the inner shell.

[0008] Optionally, a positioning column is further provided on the plug-in convex rib, and a positioning groove is further provided at the bottom of the plug-in groove, and the positioning column is adapted to be plugged into the positioning groove.

[0009] Optionally, one of the air inlet housing and the air outlet housing is provided with a latching protrusion, and the other is provided with a latching groove engaged with the latching protrusion.

[0010] Optionally, the air concentrator further comprises an air guide base, which is arranged in the air guide cavity and close to the air inlet, and a circumferential gap is provided between the air guide base and the inner wall surface of the inner shell to form an annular air inlet gap, and the air guide base is gradually arranged in a direction from the air inlet to the air outlet;

[0011] The inner wall surface of the air outlet shell is provided with a connecting column, the connecting column is provided with a connecting hole, and the air guide base is provided with a fixing hole. The connecting hole and the fixing hole are used for fasteners to pass through so as to fix the air guide base to the connecting column.

[0012] Optionally, the inner wall surface of the air inlet shell is provided with a limiting convex rib, and the air guide base is provided with a limiting groove to be plugged with the limiting convex rib.

[0013] Optionally, the outer wall surface of the air inlet shell is provided with a first rib, and the outer wall surface of the air outlet shell is provided with a second rib, the first rib and the second rib both extend in a ring shape along the circumference of the inner shell and are distributed at both ends of the inner shell, and the first rib and the second rib are respectively abutted against the inner wall surface of the outer shell.

[0014] Optionally, the opening at one end of the shell is a first opening, and the opening at the other end is a second opening. The shell has an installation cavity connecting the first opening and the second opening, and the installation cavity includes a first cavity connected to the first opening and a second cavity connected to the second opening. The air inlet housing is arranged in the first cavity from the first opening, and the air outlet housing is arranged in the second cavity from the second opening. The outer diameter of at least part of the air inlet housing is greater than the size of the second cavity to limit the air inlet housing from passing through the second cavity, and the outer diameter of at least part of the air outlet housing is greater than the size of the first cavity to limit the air outlet housing from passing through the first cavity.

[0015] Optionally, the housing includes an integrally formed conical portion and a flat portion, the conical portion forms the conical first cavity, and the flat portion forms the flat second cavity;

[0016] The air inlet housing is conical and one end thereof away from the air inlet forms a flat opening to communicate with the air outlet housing, and the air outlet housing is flat.

[0017] Optionally, at least one of the air inlet housing and the air outlet housing is detachably connected to the outer shell.

[0018] Optionally, the outer wall surface of the air inlet housing is provided with a first buckle and a first guide rib, and the inner wall surface of the shell is provided with a second buckle and a second guide rib;

[0019] The first buckle is snapped with the second buckle, the first guide rib and the second guide rib are distributed along the circumference of the shell, and the side surface of the first guide rib is in contact with the side surface of the second guide rib.

[0020] The technical solution in the embodiment of the present application adopts a dual structure of an outer shell and an inner shell. Since the inner shell and the outer shell are basically not in direct contact, the circumferential gap between the two can play a role in heat insulation, thereby greatly reducing the heat transferred from the inner shell to the outer shell, thereby avoiding the outer shell from overheating. By splitting the inner shell into two separate parts, the air inlet shell and the air outlet shell, the air inlet shell and the air outlet shell can be processed separately, which not only reduces the difficulty of each processing, but also allows the air inlet shell and the air outlet shell to be inserted into the outer shell from different ends of the outer shell and then fixed during assembly. The insertion path of the air inlet shell and the air outlet shell becomes shorter, which can avoid the obstruction caused by the outer shell during the insertion process, thereby facilitating assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is an exploded schematic diagram of the air concentrator in the embodiment of the present application;

[0023] Figure 2 for Figure 1 Schematic diagram of the assembly of the central focusing nozzle;

[0024] Figure 3 for Figure 1 Schematic diagram of the central air nozzle;

[0025] Figure 4 for Figure 3 Schematic diagram of the cross section of the central focusing nozzle along the AA line;

[0026] Figure 5 and Figure 6 for Figure 1 Schematic diagram of the structure of the air outlet housing at different angles;

[0027] Figure 7 for Figure 6 The enlarged schematic diagram of point B in the middle;

[0028] Figure 8 for Figure 1 A schematic cross-sectional view of the center air outlet housing;

[0029] Fig. 9 and Fig.10 for Figure 1 Schematic diagram of the structure of the center air outlet housing at different angles;

[0030] Fig.11 for Figure 1 A schematic cross-sectional view of the center air outlet housing;

[0031] Fig.12 for Figure 1 Structural schematic diagram of the middle wind guide base;

[0032] Fig.13 1 is a schematic diagram of the structure of the housing;

[0033] Fig.14 for Figure 1 Schematic diagram of the central focusing nozzle after assembly;

[0034] Fig.15 for Fig.14 Schematic diagram of the cross-section at CC in the middle.

[0035] Description of Figure Numbers:

[0036] Label name Label name Label name 100 Wind Concentrator 212 Card convex 223 Insertion groove 10 shell 213 Insert rib 224 Positioning slot 11 First opening 214 Positioning column 225 Second rib 12 Second opening 215 First buckle 226 Connecting column 13 Cone 216 The first guide rib 227 Connection hole 14 Flat part 217 Receiving slot 23 Air guide cavity 15 Second buckle 218 The first rib 30 Air guide base 16 Second guide rib 219 Limiting ribs 31 Fixing holes 20 Inner shell 22 Air outlet housing 32 Limit slot 21 Air inlet housing 221 Air outlet 40 magnet 211 Air Inlet 222 Card slot DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] It should be noted that, in the description of this application, if the terms "first", "second", etc. appear, "first" and "second" are only used to facilitate the description of different components or names, and cannot be understood as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" appears in the full text, its meaning is that it includes three parallel solutions, taking "A and / or B as an example", including Solution A, or Solution B, or a solution that satisfies both A and B.

[0039] Please refer to Figures 1 to 4 The embodiment of the present application proposes a wind concentrating nozzle 100, which includes an outer shell 10 and an inner shell 20. The outer shell 10 and the inner shell 20 are both hollow with openings at both ends. The inner shell 20 is arranged in the outer shell 10, and the two are arranged inside and outside. A circumferential gap is formed between the inner shell 20 and the outer shell 10.

[0040] In this embodiment, the inner shell 20 is basically spaced apart from the outer shell 10, and most of the positions of the two are not in contact, so there is a circumferential gap. The circumferential gap is annular and is arranged around the inner shell 20. When hot air passes through the inner shell 20, since the inner shell 20 and the outer shell 10 are basically not in direct contact, the circumferential gap between the two can play a role in heat insulation, so the heat transferred from the inner shell 20 to the outer shell 10 can be greatly reduced, thereby preventing the outer shell 10 from being overheated. In this way, the double-layer design of the inner shell 20 and the outer shell 10 can prevent the temperature outside the air concentrator 100 from being too high.

[0041] One end opening of the inner shell 20 is used as an air inlet 211, which is directly connected to the air outlet of the hair dryer. The shape of the air inlet 211 can be similar to the air outlet of the hair dryer. Specifically, the air inlet 211 of the inner shell 20 can be circular or approximately circular. The other end opening of the inner shell 20 is used as an air outlet 221. In order to achieve a wind gathering effect, the air outlet 221 can be flat to achieve flat air outlet.

[0042] The shape of the outer shell 10 may be similar to that of the inner shell 20 , and the two may be configured in a contoured manner, thereby forming a uniform circumferential gap and facilitating the inner shell 20 to be inserted into the outer shell 10 for assembly.

[0043] Please refer to Figures 5 to 11 In the embodiment of the present application, the inner shell 20 includes an air inlet shell 21 and an air outlet shell 22 which are separately arranged. The air inlet shell 21 and the air outlet shell 22 are both hollow with openings at both ends. The air inlet shell 21 and the air outlet shell 22 are arranged along the through direction of the outer shell 10 and are spliced ​​with each other to form an air guide cavity 23. The opening at one end of the air inlet shell 21 which is away from the air outlet shell 22 constitutes an air inlet 211, and the opening at one end of the air outlet shell 22 which is away from the air inlet shell 21 constitutes an air outlet 221.

[0044] By splitting the inner shell 20 into two separate parts, the air inlet shell 21 and the air outlet shell 22, the air inlet shell 21 and the air outlet shell 22 can be processed separately, which not only reduces the difficulty of their respective processing, but also allows the air inlet shell 21 and the air outlet shell 22 to be inserted into the outer shell 10 from different ends of the outer shell 10 during assembly and then fixed. The insertion path of the air inlet shell 21 and the air outlet shell 22 becomes shorter, which can avoid obstruction caused by the outer shell 10 during the insertion process, thereby facilitating assembly.

[0045] The air inlet housing 21 and the air outlet housing 22 are detachably connected. In this way, when cleaning or maintenance is required, the inner housing 20 and the outer housing 10 can be separated, and the inner housing 20 itself can be disassembled. The air inlet housing 21 and the air outlet housing 22 can be fixed by one or more combinations of buckle clamping, screw locking, direct processing of internal and external threaded connection, or pin plugging.

[0046] Please refer to Figure 5 and Fig. 9 In some embodiments, one of the air inlet housing 21 and the air outlet housing 22 is provided with a protrusion 212, and the other is provided with a slot 222 engaged with the protrusion 212. Specifically, the air inlet housing 21 is provided with a plurality of protrusions 212, and the plurality of protrusions 212 are spaced around the air inlet housing 21. The air outlet housing 22 is provided with a plurality of slots 222, and the plurality of protrusions 212 and the plurality of slots 222 are matched one by one. Optionally, the protrusions 212 and the slots 222 are provided near the joint of the air inlet housing 21 and the air outlet housing 22.

[0047] Since the air inlet housing 21 and the air outlet housing 22 need to be spliced ​​together to form the air guide cavity 23, in order to ensure that the air inlet housing 21 and the air outlet housing 22 are accurately docked, further, one of the end faces of the air inlet housing 21 and the end faces of the air outlet housing 22 is provided with a plug-in rib 213, and the other is provided with a plug-in groove 223 for the plug-in rib 213 to be inserted. In some embodiments, the plug-in rib 213 and the plug-in groove 223 extend in a ring shape along the circumference of the inner shell 20 respectively. When the air inlet housing 21 and the air outlet housing 22 are inserted into the outer shell 10 from different openings of the outer shell 10, the plug-in rib 213 and the plug-in groove 223 are correspondingly plugged, so that complete splicing and alignment can be achieved. In addition, since the plug-in rib 213 and the plug-in groove 223 are annular structures and are located on the end faces, it is equivalent to forming a circle of blocking at the end face position where the air inlet housing 21 and the air outlet housing 22 are docked, so as to avoid the phenomenon that the end faces where the air inlet housing 21 and the air outlet housing 22 are docked cannot be completely closed. In other embodiments, the plug-in ribs 213 and the plug-in grooves 223 may also be non-annular structures. For example, a plurality of plug-in ribs 213 are arranged at intervals along the circumferential direction on the end face of the air inlet shell 21, and a plurality of plug-in grooves 223 are arranged correspondingly on the end face of the air outlet shell 22.

[0048] Please refer to Figure 7 and Fig. 9 Furthermore, one of the air inlet housing 21 and the air outlet housing 22 is further provided with a positioning column 214, and the other is provided with a positioning groove 224. By plugging the positioning column 214 and the positioning groove 224 together, a foolproof effect can be achieved to avoid installation misalignment, and further a positioning effect can be achieved. Optionally, a positioning column 214 is further provided on the plugging rib 213, and a positioning groove 224 is further provided at the bottom of the plugging groove 223, and the positioning column 214 is adapted to be plugged in with the positioning groove 224.

[0049] The inner wall surface of the air inlet housing 21 and the inner wall surface of the air outlet housing 22 are spliced ​​to form a smooth surface, thereby reducing wind resistance and making the air flow smoother.

[0050] Please refer to Figure 4 and Fig.12In order to guide the airflow, the air concentrator 100 further includes an air guide base 30, which is arranged in the air guide cavity 23 and close to the air inlet 211. There is a circumferential gap between the air guide base 30 and the inner wall surface of the inner shell 20 to form an annular air inlet gap. In this way, when the airflow flows into the inner shell 20, it enters from the annular air inlet gap, and the airflow is separated by the air guide base 30 to form an annular airflow. And because the air guide base 30 is gradually arranged in the direction from the air inlet 211 to the air outlet 221, it is equivalent to the air guide base 30 forming a cone-like shape with an air guide slope, which can guide the airflow to the middle.

[0051] Furthermore, the inner wall surface of the air outlet housing 22 is provided with a connecting column 226, the connecting column 226 is provided with a connecting hole 227, and the air guide base 30 is provided with a fixing hole 31, and the connecting hole 227 and the fixing hole 31 are used for fasteners to pass through to fix the air guide base 30 to the connecting column 226. Optionally, the connecting column 226 extends to extend into the air inlet housing 21, and the middle part of one end of the air guide base 30 facing the air outlet 221 is provided with a fixing hole 31. Therefore, the connecting column 226 is arranged in the middle area of ​​the inner shell 20 and corresponds to the middle part of the air guide base 30, and the air guide base 30 and the air outlet housing 22 can be fixed in the middle. The provision of the connecting column 226 can avoid the situation where the air outlet housing 22 is leaked due to a hole directly opened in the air outlet housing 22.

[0052] The fasteners are specifically screws, pins or rivets.

[0053] Please refer to Fig.11 , Fig.12 , Fig.14 and Fig.15 Further, the inner wall surface of the air inlet housing 21 is provided with a limiting rib 219, and the air guide base 30 is provided with a limiting groove 32 to be plugged with the limiting rib 219. Optionally, the limiting rib 219 and the limiting groove 32 both extend along the through direction of the inner shell 20 in a long strip shape.

[0054] During installation, the air inlet housing 21 and the air outlet housing 22 are respectively inserted into the housing 10 from different openings of the housing 10 and fixed, and then the air guide base 30 is inserted into the air inlet housing 21. At this time, the limiting rib 219 slides in the limiting groove to guide the air guide base 30 into the air inlet housing 21 until the connecting column 226 is aligned with the fixing hole 31 in the middle of the air guide base 30, and then the air guide base 30 is locked with the connecting column 226 by screws. The limiting rib 219 limits the rotation of the air guide base 30, and the air guide base 30 and the air outlet housing 22 together clamp the air inlet housing 21.

[0055] Please refer to Figure 4Furthermore, the outer wall surface of the air inlet housing 21 is provided with a first convex rib 218, and the outer wall surface of the air outlet housing 22 is provided with a second convex rib 225. The first convex rib 218 and the second convex rib 225 both extend in a ring shape along the circumference of the inner shell 20 and are distributed at both ends of the inner shell 20. The first convex rib 218 and the second convex rib 225 respectively abut against the inner wall surface of the outer shell 10. In this way, it is equivalent to that at the position of the air inlet 211, the air inlet housing 21 abuts against the outer shell 10 through the first convex rib 218, plays a supporting role, and avoids the risk of radial movement of the air inlet housing 21 relative to the outer shell 10. Similarly, at the position of the air outlet 221, the air outlet housing 22 abuts against the outer shell 10 through the second convex rib 225, plays a supporting role, and also avoids the risk of radial movement of the air outlet housing 22 relative to the outer shell 10. Except for the positions of the first convex rib 218 and the second convex rib 225, the other positions of the inner shell 20 and the outer shell 10 are all arranged at intervals.

[0056] Please refer to Fig.13 In the embodiment of the present application, one end opening of the housing 10 is the first opening 11, and the other end opening is the second opening 12. The housing 10 has an installation cavity communicating with the first opening 11 and the second opening 12. The installation cavity includes a first cavity connected to the first opening 11 and a second cavity connected to the second opening 12. The air inlet housing 21 is arranged in the first cavity from the first opening 11, and the air outlet housing 22 is arranged in the second cavity from the second opening 12. Therefore, the air inlet housing 21 and the air outlet housing 22 are assembled into the housing 10 from different openings.

[0057] The shapes of the first cavity and the second cavity are different from each other, and the shapes of the air inlet housing 21 and the air outlet housing 22 are also different from each other. In addition, the air inlet housing 21 and the first cavity are basically adapted, that is, for the cross section at the same position, the outer contour of the air inlet housing 21 is basically the same as the outer contour of the first cavity, and the circumferential gap between the two is relatively uniform and the width is generally consistent. Similarly, the shapes of the air outlet housing 22 and the second cavity are also basically adapted, that is, for the cross section at the same position, the outer contour of the air outlet housing 22 is basically the same as the outer contour of the second cavity, and the circumferential gap between the two is relatively uniform and the width is generally consistent.

[0058] The outer diameter of at least some positions of the air inlet housing 21 is larger than the size of the second cavity to limit the air inlet housing 21 from passing through the second cavity, and the outer diameter of at least some positions of the air outlet housing 22 is larger than the size of the first cavity to limit the air outlet housing 22 from passing through the first cavity. In this way, the air inlet housing 21 cannot be assembled into the first cavity from the second opening 12, and the air outlet housing 22 cannot be assembled into the second cavity from the first opening 11. In view of this, the inner shell 20 in the embodiment of the present application is designed as two detachable parts, the air inlet housing 21 and the air outlet housing 22, so that the two can be assembled into the corresponding cavity from different openings, thereby avoiding the situation where they cannot be assembled.

[0059] In some embodiments, the housing 10 includes an integrally formed conical portion 13 and a flat portion 14, the conical portion 13 forming a conical first cavity, and the flat portion 14 forming a flat second cavity. The air inlet housing 21 is conical and its end away from the air inlet 211 forms a flat opening to connect to the air outlet housing 22, the air outlet housing 22 is flat and is correspondingly arranged in the flat portion 14. Through this structure, a circular air inlet gap is formed between the inner housing 20 and the air guide base 30, and the air outlet 221 of the inner housing 20 is a flat outlet, which has the effect of gathering wind.

[0060] Please refer to Fig. 9 , Fig.13 , Fig.15 In some embodiments, at least one of the air inlet housing 21 and the air outlet housing 22 is detachably connected to the housing 10. Taking the detachable connection between the air inlet housing 21 and the housing 10 as an example, the outer wall surface of the air inlet housing 21 is provided with a first buckle 215 and a first guide rib 216, and the inner wall surface of the housing 10 is provided with a second buckle 15 and a second guide rib 16. The first buckle 215 and the second buckle 15 are engaged, the first guide rib 216 and the second guide rib 16 are distributed along the circumference of the housing 10, and the side surface of the first guide rib 216 abuts against the side surface of the second guide rib 16. In this way, when the air inlet housing 21 is pushed into the housing 10 from the first opening 11, the first guide rib 216 slides along the second guide rib 16, plays a guiding role, and makes the first buckle 215 and the second buckle 15 smoothly engaged.

[0061] Please refer to Figure 1 and Fig.10 Furthermore, the end surface of the air inlet shell 21 where the air inlet 211 is arranged is also provided with a receiving groove 217, which is annular and arranged around the air inlet 211. An annular magnet 40 is embedded in the receiving groove 217, and the magnet 40 is used for magnetically cooperating with the air outlet end of the hair dryer.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wind concentrator, characterized in that: It comprises an outer shell and an inner shell, wherein the outer shell is hollow with two ends open, and the inner shell is arranged inside the outer shell and a circumferential gap is formed between the inner shell and the outer shell; The inner shell includes an air inlet shell and an air outlet shell which are separately arranged and fixed to each other. The air inlet shell and the air outlet shell are both hollow with openings at both ends. The air inlet shell and the air outlet shell are arranged along the through direction of the outer shell and are spliced ​​with each other to form an air guide cavity. The opening at one end of the air inlet shell facing away from the air outlet shell constitutes an air inlet, and the opening at one end of the air outlet shell facing away from the air inlet shell constitutes an air outlet.

2. The air concentrator according to claim 1, characterized in that: The air inlet housing and the air outlet housing are detachably connected.

3. The air concentrator according to claim 2, characterized in that: One of the end surface of the air inlet housing and the end surface of the air outlet housing is provided with an inserting convex rib, and the other is provided with an inserting groove for the inserting convex rib to be inserted into.

4. The air concentrator according to claim 3, characterized in that: A positioning column is also provided on the plug-in convex rib, and a positioning groove is also provided at the groove bottom of the plug-in groove, and the positioning column is adapted to be plugged into the positioning groove.

5. The air concentrator according to claim 1, characterized in that: One of the air inlet housing and the air outlet housing is provided with a clamping protrusion, and the other is provided with a clamping groove clamped with the clamping protrusion.

6. The air concentrator according to any one of claims 1 to 5, characterized in that: The air concentrator further comprises an air guide base, which is arranged in the air guide cavity and close to the air inlet, and a circumferential gap is provided between the air guide base and the inner wall surface of the inner shell to form an annular air inlet gap, and the air guide base is gradually arranged in a direction from the air inlet to the air outlet; The inner wall surface of the air outlet shell is provided with a connecting column, the connecting column is provided with a connecting hole, and the air guide base is provided with a fixing hole. The connecting hole and the fixing hole are used for fasteners to pass through so as to fix the air guide base to the connecting column.

7. The air concentrator according to claim 6, characterized in that: The inner wall surface of the air inlet housing is provided with a limiting convex rib, and the air guide base is provided with a limiting groove to be plugged with the limiting convex rib.

8. The air concentrator according to claim 1, characterized in that: The outer wall surface of the air inlet shell is provided with a first convex rib, and the outer wall surface of the air outlet shell is provided with a second convex rib. The first convex rib and the second convex rib both extend in a ring shape along the circumference of the inner shell and are distributed at both ends of the inner shell. The first convex rib and the second convex rib respectively abut against the inner wall surface of the outer shell.

9. The air concentrator according to claim 1, characterized in that: One end opening of the shell is a first opening, and the other end opening is a second opening. The shell has an installation cavity connecting the first opening and the second opening, and the installation cavity includes a first cavity connected to the first opening and a second cavity connected to the second opening. The air inlet housing is arranged in the first cavity from the first opening, and the air outlet housing is arranged in the second cavity from the second opening. The outer diameter of at least part of the air inlet housing is greater than the size of the second cavity to limit the air inlet housing from passing through the second cavity, and the outer diameter of at least part of the air outlet housing is greater than the size of the first cavity to limit the air outlet housing from passing through the first cavity.

10. The air concentrator according to claim 9, characterized in that: The housing comprises an integrally formed conical portion and a flat portion, the conical portion forming the conical first cavity, and the flat portion forming the flat second cavity; The air inlet housing is conical and one end thereof away from the air inlet forms a flat opening to communicate with the air outlet housing, and the air outlet housing is flat.

11. The air concentrator according to claim 1, characterized in that: At least one of the air inlet housing and the air outlet housing is detachably connected to the outer shell.

12. The air concentrator according to claim 11, characterized in that: The outer wall surface of the air inlet housing is provided with a first buckle and a first guide rib, and the inner wall surface of the housing is provided with a second buckle and a second guide rib; The first buckle is snapped with the second buckle, the first guide rib and the second guide rib are distributed along the circumference of the shell, and the side surface of the first guide rib is in contact with the side surface of the second guide rib.

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