TW201702537A - Air-exchanging device - Google Patents

Abstract

An air-exchanging device is disclosed for solving the problem about suffering with weak steadiness of combining and poor insulation effect of conventional air-exchanging device. The air-exchanging device comprises a guiding tube. At least one of the two end of the guiding tube combines with a cover or an indoor machine. A combining part between the guiding tube and the cover has a separating member and at least an axial locating portion. Instead, a combining part between the guiding tube and the indoor machine has a separating member and at least an axial locating portion.

Description

Air flow switching device

The present invention relates to an air flow exchange device, and more particularly to an air flow exchange device which can provide a ventilation and ventilation function and can be stably coupled to a predetermined position of a spacer.

Referring to FIG. 1, a conventional airflow exchange device 9 is disclosed. The airflow exchange device 9 includes a wind guide body 91, a partition member 92, and two fans 93. The partitioning member 92 is disposed inside the air guiding duct body 91 to divide the first air guiding space 91a into a first guiding space 91a and a second guiding space 91b. The two fans 93 are respectively coupled to the first guiding space 91a and the The second flow guiding space 91b. The airflow switching device 9 can be installed in a mounting hole D1 of a partition D (such as an outer wall or the like). The opposite ends 911 and 912 of the air guiding duct body 91 respectively face one of the two sides of the spacer D. The external space S1 is in an internal space S2.

Moreover, the two end portions 911 and 912 of the air guiding duct body 91 can respectively be combined with a cover 94 and an indoor unit 95; wherein the cover 94 can block the external space without affecting the airflow. The foreign matter of S1 (such as dust of a larger particle size) enters the inside of the air guiding duct body 91, and the indoor unit 95 communicates with the air guiding duct body 91; thereby, the fan 93 of the first guiding space 91a can be utilized The airflow in the external space S1 is sequentially introduced into the internal space S2 via the first flow guiding space 91a of the air guiding duct 91 and the indoor unit 95, and the inside of the internal space Sb is again fanned by the fan 93 of the second guiding space 91b. The airflow in the space S2 is sequentially led to the external space S1 via the indoor unit 95 and the second flow guiding space 91b of the air guiding duct body 91 to provide a circulating ventilation function. An embodiment similar to the conventional airflow switching device 9 has been disclosed in the China Bulletin Patent applications such as CN203550108 and CN203907874 "Airflow Exchange Device".

However, the cover 94 or the indoor unit 95 is only fitted over the outer circumferential surface of the air guiding duct body 91 in the axial direction of the air guiding duct body 91 (refer to the direction in which the fan 93 guides the flow of the airflow) due to There is no axial positioning structure between the cover 94 or the indoor unit 95 and the air guiding tube 91. Therefore, the cover 94 or the indoor unit 95 may be on the upper shaft of the air guiding body 91 due to an external force. Sliding, the combination is not stable. Moreover, after the cover 94 or the indoor unit 95 and the air guiding tube body 91 are combined, it is also easy to generate a gap d due to assembly tolerances between the two, and the gap d may cause the external space S1 such as water. Foreign matter such as gas, dust, or mosquito enters the internal space S2 through the first flow guiding space 91a or the second flow guiding space 91b from the gap d, so that the isolation and blocking effect of the air flow switching device 9 is also poor.

The term "spacer" as used in the present invention refers to various components that can be used to separate the outer space from the inner space, and has mounting holes for the airflow switching device to be assembled. For example, when the partition is the outer wall of the building, the outer side (ie, the outdoor) of the outer wall is an outer space, and the inner side (ie, the indoor) of the outer wall is an inner space.

The present invention provides an air flow exchange device which ensures that the air flow exchange device can be firmly coupled to the mounting hole and prevents any axial displacement.

According to the present invention, it is possible to effectively prevent foreign matter such as moisture, dust, or mosquitoes from entering the internal space by the above-described air flow exchange device.

The airflow switching device of the present invention comprises a wind guiding pipe body, wherein the opposite ends of the air guiding pipe body can simultaneously be combined with a cover or an indoor unit, or one end of the air guiding pipe body can be combined with a cover or an indoor machine.

When one end of the air guiding pipe body is selected to be combined with the cover, the air flow switching device comprises a wind guiding pipe body and a cover. The air guiding pipe body has an outer guiding end and an inner guiding end; the cover is coupled to the outer guiding end of the air guiding pipe body; wherein the air guiding pipe body and the sleeve The joint between the covers is provided with a blocking member and at least one axial positioning portion.

Wherein, the outer air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body form a positioning shoulder, and the cover has a guiding flow toward the outer portion a first joint end of the end, the first joint end abuts against the positioning shoulder, and the first joint end is provided with an outer diameter reducing portion, and the outer diameter reducing portion forms an abutment with the outer peripheral wall of the sleeve a shoulder portion, the outer flow guiding end abuts against the abutting shoulder portion, the positioning shoulder portion and the abutting shoulder portion together forming the axial positioning portion.

Wherein, the outer air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body form a positioning shoulder, and the cover has a guiding flow toward the outer portion a first joint end of the end, the first joint end abuts against the positioning shoulder, and the first joint end is provided with an inner diameter reducing portion, and the inner diameter reducing portion forms an abutment with the inner peripheral wall of the sleeve a shoulder portion, the outer flow guiding end abuts against the abutting shoulder portion, the positioning shoulder portion and the abutting shoulder portion together forming the axial positioning portion.

Wherein, the cover has a first joint end facing the outer flow guiding end of the air guiding pipe body, and the first joint end is provided with an outer diameter reducing portion, and the outer diameter reducing portion is formed with the outer peripheral wall of the sleeve An abutting shoulder abuts against the abutting shoulder, the abutting shoulder being the axial positioning portion. Or the cover has a first joint end facing the outer flow guiding end of the air duct body, and the outer air guiding end of the air duct body is provided with an outer diameter reducing portion, the outer diameter reducing portion and the air guiding tube A positioning shoulder is formed between the outer peripheral walls of the body, and the first engaging end abuts against the positioning shoulder, and the positioning shoulder is the axial positioning portion.

Wherein, the blocking member is a tape, a foam or a glue.

Wherein, the outer air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body form a positioning shoulder, and the cover has a guiding flow toward the outer portion a first joint end of the end, the first joint end abuts against the positioning shoulder, and the first joint end is provided with an outer diameter reducing portion, and the outer diameter reducing portion forms an abutment with the outer peripheral wall of the sleeve The blocking portion is a sealing ring, and the blocking member is disposed between the outer guiding end and the abutting shoulder, and the outer guiding end and the abutting shoulder respectively abut the two sides of the blocking member The outer guiding end can be indirectly abutted against the abutting shoulder via the blocking member, and the positioning shoulder and the abutting shoulder together form the axial positioning portion.

Wherein, the outer air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body form a positioning shoulder, and the cover has a guiding flow toward the outer portion a first binding end of the end, the blocking component is a sealing ring, the blocking component is disposed between the positioning shoulder and the first bonding end, and the first bonding end and the positioning shoulder respectively abut the blocking component The first joint end is provided with an inner diameter reducing portion, so that the first joint end can be indirectly abutted against the positioning shoulder via the resisting member, and the first joint end is provided with an inner diameter reducing portion. An abutting shoulder is formed between the reduced diameter portion and the inner peripheral wall of the cover, the outer guiding end abuts against the abutting shoulder, and the positioning shoulder and the abutting shoulder together form the axial positioning portion .

Wherein, the cover has a first joint end facing the outer flow guiding end of the air guiding pipe body, and the first joint end is provided with an outer diameter reducing portion, and the outer diameter reducing portion is formed with the outer peripheral wall of the sleeve The abutting member is a sealing ring, and the blocking member is disposed between the outer guiding end and the abutting shoulder, and the outer guiding end and the abutting shoulder respectively abut the blocking member The two sides are such that the external flow guiding end can indirectly abut against the abutting shoulder via the blocking member, and the abutting shoulder is the axial positioning portion. Or the cover has a first joint end facing the outer flow guiding end of the air duct body, and the outer air guiding end of the air duct body is provided with an outer diameter reducing portion, the outer diameter reducing portion and the air guiding tube Forming a positioning shoulder between the outer peripheral wall of the body, the blocking member is a sealing ring, and the blocking member is disposed between the positioning shoulder and the first joint end, wherein the first joint end and the positioning shoulder are respectively Abutting the two sides of the blocking member, and the first bonding end is provided with an inner diameter reducing portion, so that the first bonding end can indirectly abut against the positioning shoulder via the blocking member, the positioning shoulder is the axial direction Positioning department.

Wherein, the blocking member is a sealing ring made of a flexible material.

The air guiding duct body is provided with at least one fan between the external air guiding end and the inner air guiding end.

The cover is provided with a plurality of vents that communicate with the inside of the air duct body, and the cover is provided with a filter screen inside the vent.

When one end of the air guiding pipe body is selected to be combined with the indoor unit, the air flow switching device includes a wind guiding pipe body and an indoor unit. The air guiding pipe body has an outer guiding end and an inner guiding end; the indoor unit is coupled to the inner guiding end of the air guiding pipe body; wherein a joint portion between the air guiding pipe body and the indoor unit is provided There is a blocking member and at least one axial positioning portion.

Wherein, the inner air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body form a positioning shoulder, and the indoor unit has a guiding flow toward the inner portion a second joint end of the end, the second joint end abuts against the positioning shoulder, and the second joint end is provided with an outer diameter reducing portion, and the outer diameter reducing portion forms an offset with the outer peripheral wall of the indoor unit a shoulder portion, the inner flow guiding end abuts against the abutting shoulder portion, the positioning shoulder portion and the abutting shoulder portion together forming the axial positioning portion.

Wherein, the inner air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body form a positioning shoulder, and the indoor unit has a guiding flow toward the inner portion a second joint end of the end, the second joint end abuts against the positioning shoulder, and the second joint end is provided with an inner diameter reducing portion, and the inner diameter reducing portion forms an abutment with the inner peripheral wall of the indoor unit a shoulder portion, the inner flow guiding end abuts against the abutting shoulder portion, the positioning shoulder portion and the abutting shoulder portion together forming the axial positioning portion.

The indoor unit has a second joint end facing the inner flow guiding end of the air guiding duct body, and the second joint end is provided with an outer diameter reducing portion formed between the outer diameter reducing portion and the outer peripheral wall of the indoor unit. An abutting shoulder, the inner guiding end abuts against the abutting shoulder, and the abutting shoulder is the axial positioning portion. Alternatively, the indoor unit has a second joint end facing the inner flow guiding end of the air guiding duct body, and the inner guiding end of the air guiding duct body is provided with an outer diameter reducing portion, the outer contraction A positioning shoulder is formed between the diameter portion and the outer peripheral wall of the air guiding tube body, and the second engaging end abuts against the positioning shoulder portion, and the positioning shoulder portion is the axial positioning portion.

Wherein, the blocking member is a tape, a foam or a glue.

Wherein, the inner air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body form a positioning shoulder, and the indoor unit has a guiding flow toward the inner portion a second joint end of the end, the second joint end abuts against the positioning shoulder, and the second joint end is provided with an outer diameter reducing portion, and the outer diameter reducing portion forms an offset with the outer peripheral wall of the indoor unit a shoulder portion and an outer diameter reducing portion, wherein the outer diameter reducing portion and the outer peripheral wall of the indoor unit form an abutting shoulder, the blocking member is a sealing ring, and the blocking member is disposed at the inner guiding end and the Between the abutting shoulders, the inner guiding end and the abutting shoulder respectively abut the two sides of the blocking member so that the inner guiding end can indirectly abut against the abutting shoulder via the blocking member, the positioning shoulder The portion and the abutting shoulder together constitute the axial positioning portion.

Wherein, the inner air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body form a positioning shoulder, and the indoor unit has a guiding flow toward the inner portion The second bonding end of the end, the blocking component is a sealing ring, the blocking component is disposed between the positioning shoulder and the second bonding end, and the second bonding end and the positioning shoulder respectively abut the blocking component a side of the second joint end capable of indirectly abutting against the positioning shoulder via the resisting member, and the second joint end is provided with an inner diameter reducing portion formed between the inner diameter reducing portion and the inner peripheral wall of the indoor unit An abutting shoulder, the inner guiding end abuts against the abutting shoulder, the positioning shoulder and the abutting shoulder together forming the axial positioning portion.

The indoor unit has a second joint end facing the inner flow guiding end of the air guiding duct body, and the second joint end is provided with an outer diameter reducing portion formed between the outer diameter reducing portion and the outer peripheral wall of the indoor unit. The abutting member is a sealing ring, and the blocking member is disposed between the inner guiding end and the abutting shoulder, and the inner guiding end and the abutting shoulder respectively abut the blocking member The two sides enable the inner flow guiding end to indirectly abut against the abutting shoulder via the blocking member The abutment shoulder is the axial positioning portion. Alternatively, the indoor unit has a second joint end facing the inner flow guiding end of the air guiding duct body, and the inner guiding end of the air guiding duct body is provided with an outer diameter reducing portion, the outer diameter reducing portion and the air guiding tube Forming a positioning shoulder between the outer peripheral wall of the body, the blocking member is a sealing ring, the blocking member is disposed between the positioning shoulder and the second joint end, and the second joint end and the positioning shoulder respectively abut The two sides of the blocking member are connected to the positioning shoulder through the blocking member, and the positioning shoulder is the axial positioning portion.

Wherein, the blocking member is a sealing ring made of a flexible material.

The air guiding duct body is provided with at least one fan between the external air guiding end and the inner air guiding end.

The indoor unit is provided with a control group electrically coupled to the fan.

The airflow exchange device of the present invention is provided with the above-mentioned blocking member at a joint portion between the air guiding pipe body and the cover, or the blocking portion is provided at a joint portion between the air guiding pipe body and the indoor unit. To provide better isolation and resistance. Moreover, the axial positioning portion formed by the joint portion between the air guiding tube body and the cover or the indoor unit further has the effect of improving the bonding stability.

〔this invention〕

1‧‧‧air duct body

1a‧‧‧First Diversion Space

1b‧‧‧Second diversion space

11‧‧‧External diversion

111‧‧‧First air duct

112‧‧‧Second air vent

113‧‧‧ positioning shoulder

114‧‧‧ positioning shoulder

12‧‧‧Internal diversion

121‧‧‧ Third air duct

122‧‧‧fourth air vent

13‧‧‧Parts

14‧‧‧Fan

2 ‧ ‧ cover

21‧‧‧ vents

22‧‧‧ Filter

23‧‧‧First joint end

24‧‧‧Abut the shoulder

3‧‧‧ indoor unit

3a‧‧‧First room

3b‧‧‧Second room

31‧‧‧air outlet

32‧‧‧Air inlet

33‧‧‧Control Group

34‧‧‧Second junction

35‧‧‧Abut the shoulder

4‧‧‧Stop

D‧‧‧ gap

D1‧‧‧Inner reducing section

D2‧‧‧External diameter

D‧‧‧Separators

D1‧‧‧ mounting hole

S1‧‧‧External space

S2‧‧‧ interior space

L‧‧‧ axial

P1, P2‧‧‧ axial positioning

[study]

9‧‧‧Air exchange device

91‧‧‧Air duct body

91a‧‧‧First Diversion Space

91b‧‧‧Second diversion space

911‧‧‧ end

912‧‧‧ end

92‧‧‧Parts

93‧‧‧fan

94‧‧ ‧ cover

95‧‧‧ indoor unit

D‧‧‧ gap

D‧‧‧Separators

D1‧‧‧ mounting hole

S1‧‧‧External space

S2‧‧‧ interior space

Fig. 1 is a sectional view showing a combination of a conventional air flow exchange device.

Fig. 2 is a sectional view showing the combination of the first embodiment of the air flow switching device of the present invention.

Figure 3 is a cross-sectional view showing the assembly of the second embodiment of the air flow switching device of the present invention.

Figure 4 is a sectional view showing the combination of the third embodiment of the air flow switching device of the present invention.

Fig. 5 is a sectional view showing the assembly of the fourth embodiment of the air flow switching device of the present invention.

Figure 6 is a cross-sectional view showing the assembly of the fifth embodiment of the air flow switching device of the present invention.

Figure 7 is a cross-sectional view showing the assembly of the sixth embodiment of the air flow switching device of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to FIG. 2, the airflow switching device of the present invention is mounted on a spacer D. One side of the spacer D is an external space S1, and the opposite side of the spacer D is an internal space. S2. The airflow control device includes a wind guide body 1, the air duct body 1 is mounted on a mounting hole D1 of the spacer D, and the opposite ends of the air duct body 1 are combined with at least one cover 2 or An indoor unit 3. In this embodiment, the opposite ends of the air duct body 1 simultaneously combine the cover 2 and the indoor unit 3.

The opposite ends of the air guiding tube body 1 are respectively provided with an outer guiding end 11 and an inner guiding end 12, and the direction of the air guiding tube 1 along the outer guiding end 11 and the inner guiding end 12 is An axial direction L, and the outer flow guiding end 11 and the inner flow guiding end 12 of the air guiding duct body 1 respectively face the outer space S1 and the inner space S2 for introducing and extracting airflow; wherein the air guiding duct body 1 The hollow pipe body having the basic ventilation function is selected as the premise, and the internal structure and appearance shape of the air duct body 1 are designed, and the invention is not limited. In this embodiment, the air guiding tube body 1 is a hollow air tube. The outer air guiding end 11 is provided with a first air guiding port 111 and a second air guiding port 112. The inner air guiding end 12 is provided with a third air guiding port 121. And a fourth air guiding port 122, the air guiding pipe body 1 is internally provided with a partitioning member 13 for separating the inside of the air guiding pipe body 1 into two independent first guiding spaces 1a and a second air guiding space 1b, the first air guiding space 1a is connected to the first air guiding port 111 and the third air guiding port 121, and the second air guiding space 1b is connected to the second air guiding port 112 and the fourth air guiding port 122, in the present embodiment, the partition member 13 is formed into a flat shape, but the partition member 13 may be formed in a curved shape or a curved shape, and the present invention is not limited thereto.

At least one fan 14 may be further disposed on at least one of the first flow guiding space 1a and the second flow guiding space 1b, and the at least one fan 14 is located at the outer guiding end 11 and the inner guiding end 12 In this embodiment, the first diversion space is revealed A fan 14 is provided in each of the 1a and the second flow guiding spaces 1b, whereby a better circulation ventilation effect can be provided.

The outer air guiding end 11 of the air guiding pipe body 1 can be combined with the above-mentioned cover 2, and the cover 2 of the present invention has a ventilation function and can prevent foreign matter in the air from entering the inside of the air guiding pipe body 1. In this embodiment, the cover 2 is provided with a plurality of vents 21 for communicating with the inside of the air duct body 1, wherein the plurality of vents 21 can respectively communicate with the first air guiding port of the outer air guiding end 11 111 and the second air guiding port 112; preferably, a filter screen 22 is disposed inside the venting opening 21 of the cover 2, and the filter screen 22 can avoid leaves, petals, hair, paper dust, sand or the air. Foreign matter such as mosquitoes enters the inside of the air duct body 1 to provide better filtration resistance.

A blocking member 4 is disposed at a joint portion between the air guiding pipe body 1 and the cover 2, and the blocking member 4 is configured to close the air guiding pipe body 1 and the cover 2 after assembly. A gap d is created to provide a better isolation barrier effect. As shown in Figures 2 and 4, the blocking member 4 can be a tape that can be wrapped around the joint between the air guiding tube body 1 and the cover 2 to close the gap d; or 3, the blocking member 4 can be a foam, which can be filled inside the mounting hole D1 and a joint portion between the air guiding tube body 1 and the cover 2 for closing the gap d, Moreover, the air guiding tube body 1 can be more firmly coupled into the mounting hole D1; or as shown in FIG. 5, the blocking member 4 can be an adhesive glue, which can be conveniently and quickly applied to the air guiding body. A joint portion between the pipe body 1 and the cover 2 is used to close the gap d. Moreover, the joint portion between the air duct body 1 and the cover 2 can be further provided with at least one axial positioning portion P1 in the axial direction L to prevent the sleeve cover 2 from being in any axis in the axial direction L. Displacement.

Referring to FIG. 2 again, in the present embodiment, the outer air guiding end 11 of the air guiding duct body 1 is provided with an inner diameter reducing portion d1, and the inner diameter reducing portion d1 and the inner peripheral wall of the air guiding tube body 1. Forming a positioning shoulder 113; the cover 2 has a first joint end 23 facing the outer flow guiding end 11, the first joint end 23 abuts against the positioning shoulder 113, and the first knot The joint end 23 is provided with an outer diameter reducing portion d2. The outer diameter reducing portion d2 and the outer peripheral wall of the sleeve 2 form an abutting shoulder portion 24, and the outer air guiding end 11 abuts against the abutting shoulder portion 24. . Thereby, the positioning shoulder 113 and the abutting shoulder 24 can jointly form the axial positioning portion P1 to provide a better axial positioning effect between the air guiding body 1 and the cover 2.

Referring to FIG. 3 again, in the present embodiment, the outer air guiding end 11 of the air guiding duct body 1 is provided with an outer diameter reducing portion d2, and the outer diameter reducing portion d2 and the outer peripheral wall of the air guiding tube body 1. Forming a positioning shoulder 113; the cover 2 has a first coupling end 23 facing the outer guiding end 11 , the first bonding end 23 abuts against the positioning shoulder 113 , and the first bonding end The inner diameter reducing portion d1 defines an abutting shoulder portion 24 between the inner diameter reducing portion d1 and the inner peripheral wall of the cover 2, and the outer air guiding end 11 abuts against the abutting shoulder portion 24. Thereby, the positioning shoulder 113 and the abutting shoulder 24 can also jointly form the axial positioning portion P1 to provide a better axial positioning effect between the air guiding tube body 1 and the cover 2 .

Referring to FIG. 4 again, in the embodiment, the cover 2 has a first joint end 23 facing the outer flow guiding end 11 of the air duct body 1, and the first joint end 23 is provided with a contraction end. The diameter portion d2, the outer diameter reducing portion d2 and the outer peripheral wall of the cover 2 form an abutting shoulder portion 24, the outer air guiding end 11 abuts against the abutting shoulder portion 24; or, as shown in Fig. 5 As shown, the cover 2 also has a first coupling end 23 facing the outer flow guiding end 11, and the outer guiding end 11 of the air guiding tube body 1 is provided with an outer diameter reducing portion d2, the outer diameter reducing portion d2 A positioning shoulder 113 is formed between the outer peripheral wall of the air guiding body 1 and the first engaging end 23 abuts against the positioning shoulder 113. Thereby, the abutting shoulder 24 or the positioning shoulder 113 can be regarded as the axial positioning portion P1 alone, and the axial positioning effect between the air guiding body 1 and the cover 2 can also be provided. .

Further, in the embodiment of the second to fifth embodiments, the stopper 4 is provided on the outer circumference of the air guiding tube 1 and the cover 2, as shown in Fig. 6, in some embodiments of the present invention The blocking member 4 can be a sealing ring, and the first bonding end 23 of the cover 2 An outer diameter reducing portion d2 is formed, and an abutting shoulder portion 24 is formed between the outer diameter reducing portion d2 and the outer peripheral wall of the cover 2, and the blocking member 4 can be disposed on the outer guiding end of the air guiding tube body 1. Between the abutting shoulder portion 24 and the abutting shoulder portion 24 respectively abutting the two sides of the blocking member 4, so that the outer guiding end 11 can be indirectly abutted via the blocking member 4 The abutment shoulder 24 is here. Thereby, the blocking member 4 can close the gap d between the outer flow guiding end 11 of the air guiding pipe body 1 and the abutting shoulder portion 24 of the cover 2 after assembly due to assembly tolerances.

Although in the embodiment shown in Fig. 6, the abutment shoulder 24 is individually regarded as the axial positioning portion P1. However, according to the embodiment shown in FIG. 2, the outer flow guiding end 11 of the air guiding duct body 1 may further be provided with an inner diameter reducing portion d1 and the inner side of the air guiding tube body 1 A positioning shoulder 113 is formed between the peripheral walls; the first joint end 23 of the cover 2 abuts against the positioning shoulder 113. Thereby, the positioning shoulder 113 and the abutting shoulder 24 can jointly form the axial positioning portion P1 to provide a better axial positioning effect between the air guiding tube body 1 and the cover 2, and the The blocking member 4 can still be disposed between the outer guiding end 11 and the abutting shoulder 24 such that the outer guiding end 11 can indirectly abut against the abutting shoulder 24 via the blocking member 4.

In contrast, in another embodiment of the present invention, the blocking member 4 can be a sealing ring, and the outer guiding end 11 of the air guiding tube body 1 is provided with an outer diameter reducing portion d2. A positioning shoulder 113 is formed between the outer diameter reducing portion d2 and the outer peripheral wall of the air guiding tube body 1. The blocking member 4 can be disposed on the positioning shoulder portion 113 and the first joint end 23 of the sleeve cover 2. The first bonding end 23 and the positioning shoulder 113 respectively abut the two sides of the blocking member 4, so that the first bonding end 23 can indirectly abut against the positioning shoulder 113 via the blocking member 4. Thereby, the blocking member 4 can close the gap d between the positioning shoulder 113 of the air guiding body 1 and the first joint end 23 of the cover 2 after assembly due to assembly tolerances.

Although in the embodiment shown in Fig. 7, the positioning shoulder 113 is individually regarded as the above-described axial positioning portion P1. However, according to the embodiment shown in FIG. 3 above, the cover 2 is The first joint end 23 can also be provided with an inner diameter reducing portion d1. The inner diameter reducing portion d1 and the inner peripheral wall of the sleeve 2 form an abutting shoulder portion 24, and the outer air guiding end 11 abuts against the Abut the shoulder 24. Thereby, the positioning shoulder 113 and the abutting shoulder 24 can jointly form the axial positioning portion P1 to provide a better axial positioning effect between the air guiding tube body 1 and the cover 2, and the The blocking member 4 can still be disposed between the positioning shoulder 113 and the first coupling end 23 such that the first coupling end 23 can indirectly abut against the positioning shoulder 113 via the blocking member 4.

Wherein, the blocking member 4 can be a sealing ring made of a flexible material (for example, rubber), so that the blocking member 4 can be deformed when the air guiding tube body 1 is clamped with the cover tube 2, so that The effect of sealing the gap d between the air guiding tube body 1 and the cover 2 is well achieved. Furthermore, the sealing ring may be an O-ring or a ring of other shapes. As shown in FIG. 6, the blocking member 4 may be a sealing ring having a circular cross section; or, as in the seventh As shown in the figure, the blocking member 4 may be a sealing ring having a polygonal cross section. The blocking member 4 may also be a sealing ring having other shapes (for example, an elliptical shape or a wedge shape) in cross section, and the invention is not limited thereto.

The inner air guiding end 12 of the air guiding duct body 1 can be combined with the indoor unit 3, and the indoor unit 3 is used to control the airflow without affecting the airflow of the air guiding duct body 1 and the inner space S2. The operation of the airflow switching device is invented (for example, controlling the opening and closing timing or operation mode of the fan 14 and the like). In this embodiment, the indoor unit 3 can be eccentrically arranged with respect to the air duct body 1, and a first chamber 3a and a second chamber 3b are formed inside the indoor unit 3, the first The chamber 3a and the second chamber 3b can be two separate compartments. The first chamber 3a communicates with the first air guiding space 1a via the third air guiding port 121, and the second chamber 3b communicates with the second air guiding space 1b via the fourth air guiding port 122, and the indoor unit 3 An air outlet 31 and an air inlet 32 respectively connecting the first chamber 3a and the second chamber 3b are provided, so that the indoor unit 3 can cooperate with the air duct body 1 to provide a circulating ventilation function. Furthermore, the first chamber 3a or the second chamber 3b of the indoor unit 3 can be provided with a control group 33. The control group 33 can be electrically coupled to the fan 14 for controlling the rotation of the fan 14. The During the process of introducing or deriving the airflow, the indoor unit 3 can simultaneously dissipate heat for the control group 33 to improve the service life of the control group 33. In addition, since the indoor unit 3 is located in the internal space S2, the indoor unit 3 It can also be used as a control panel of the airflow exchange device of the present invention to improve the ease of use.

Referring to FIG. 2 to FIG. 7 , the joint portion between the air guiding duct body 1 and the indoor unit 3 can also be provided with the above-mentioned blocking member 4 for closing the air guiding duct body 1 and the same. A gap d between the indoor units 3 due to assembly tolerances after bonding to provide a better isolation and blocking effect. Further, the joint portion between the air duct body 1 and the indoor unit 3 may be provided with at least one axial positioning portion P2 in the axial direction L to prevent the indoor unit 3 from being in any axis in the axial direction L. Displacement.

Referring to FIG. 2 again, in the present embodiment, the inner flow guiding end 12 of the air guiding duct body 1 is provided with an inner diameter reducing portion d1, and the inner diameter reducing portion d1 and the inner peripheral wall of the air guiding tube body 1. Forming a positioning shoulder 114; the indoor unit 3 has a second joint end 34 facing the inner flow guiding end 12, the second joint end 34 abuts against the positioning shoulder 114, and the second joint end The outer diameter reducing portion d2 defines an abutting shoulder 35 between the outer diameter reducing portion d2 and the outer peripheral wall of the indoor unit 3, and the inner guiding end 12 abuts against the abutting shoulder portion 35. Thereby, the positioning shoulder 114 and the abutting shoulder 35 can jointly form the axial positioning portion P2 to provide a better axial positioning effect between the air guiding body 1 and the indoor unit 3.

Referring to FIG. 3 again, in the present embodiment, the inner flow guiding end 12 of the air guiding duct body 1 is provided with an outer diameter reducing portion d2, and the outer diameter reducing portion d2 and the outer peripheral wall of the air guiding tube body 1. Forming a positioning shoulder 114; the indoor unit 3 has a second joint end 34 facing the inner flow guiding end 12, the second joint end 34 abuts against the positioning shoulder 114, and the second joint end The inner diameter reducing portion d1 defines an abutting shoulder 35 between the inner diameter reducing portion d1 and the inner peripheral wall of the indoor unit 3, and the inner guiding end 12 abuts against the abutting shoulder portion 35. Thereby, the positioning shoulder 114 and the abutting shoulder 35 can also jointly form the axial positioning portion P2 to A better axial positioning effect between the air guiding duct body 1 and the indoor unit 3 is provided.

Referring to FIG. 4 again, in the embodiment, the indoor unit 3 has a second joint end 34 facing the inner flow guiding end 12 of the air duct body 1, and the second joint end 34 is provided with a contraction end. The diameter portion d2, the outer diameter portion d2 and the outer peripheral wall of the indoor unit 3 form an abutting shoulder 35, the inner flow guiding end 12 abuts against the abutting shoulder 35; or, as shown in Fig. 5 The indoor unit 3 also has a second joint end 34 facing the inner flow guiding end 12 of the air duct body 1. The inner air guiding end 12 of the air duct body 1 is provided with an outer diameter reducing portion d2. A positioning shoulder 114 is formed between the outer diameter reducing portion d2 and the outer peripheral wall of the air guiding tube body 1, and the second joint end 34 abuts against the positioning shoulder portion 114. Thereby, the abutting shoulder 35 or the positioning shoulder 114 can be regarded as the axial positioning portion P2 alone, and the axial positioning effect between the air guiding body 1 and the indoor unit 3 can also be provided. .

Referring to FIG. 6 again, in some embodiments of the present invention, the blocking member 4 can be a sealing ring, and the second bonding end 34 of the indoor unit 3 is provided with an outer diameter reducing portion d2. An abutting shoulder 35 is formed between the portion d2 and the outer peripheral wall of the indoor unit 3, and the blocking member 4 can be disposed between the inner guiding end 12 of the air guiding body 1 and the abutting shoulder 35. The inner guiding end 12 and the abutting shoulder 35 respectively abut against the two sides of the blocking member 4, so that the inner guiding end 12 can indirectly abut against the abutting shoulder 35 via the blocking member 4. Thereby, the blocking member 4 can close the gap d between the inner flow guiding end 12 of the air guiding body 1 and the abutting shoulder 35 of the indoor unit 3 due to assembly tolerances after the assembly.

Although in the embodiment shown in Fig. 6, the abutment shoulder 35 is individually regarded as the above-described axial positioning portion P2. However, according to the embodiment shown in FIG. 2, the inner flow guiding end 12 of the air guiding duct body 1 may further be provided with an inner diameter reducing portion d1 and the inner side of the air guiding tube body 1 A positioning shoulder 114 is formed between the peripheral walls; the second joint end 34 of the indoor unit 3 abuts against the positioning shoulder 114. Thereby, the positioning shoulder portion 114 and the abutting shoulder portion 35 can jointly form the axial positioning portion P2 to provide a better connection between the air guiding tube body 1 and the indoor unit 3. a good axial positioning effect, and the blocking member 4 can still be disposed between the inner guiding end 12 and the abutting shoulder 35, such that the inner guiding end 12 can indirectly abut against the blocking member 4 Abuts the shoulder 35.

In contrast, in another embodiment of the present invention, the blocking member 4 can be a sealing ring, and the inner guiding end 12 of the air guiding tube body 1 is provided with an outer diameter reducing portion d2. A positioning shoulder 114 is formed between the outer diameter reducing portion d2 and the outer peripheral wall of the air guiding tube body 1. The blocking member 4 can be disposed on the positioning shoulder portion 114 and the second joint end 34 of the indoor unit 3. The second bonding end 34 and the positioning shoulder 114 respectively abut the two sides of the blocking member 4, so that the second bonding end 34 can indirectly abut against the positioning shoulder 114 via the blocking member 4. Thereby, the blocking member 4 can close the gap d between the positioning shoulder 114 of the air guiding body 1 and the second coupling end 34 of the indoor unit 3 due to assembly tolerances after the assembly.

Although in the embodiment shown in Fig. 7, the positioning shoulder portion 114 is individually regarded as the above-described axial positioning portion P2. However, according to the embodiment shown in FIG. 3, the second joint end 34 of the indoor unit 3 may further be provided with an inner diameter reducing portion d1 between the inner diameter reducing portion d1 and the inner peripheral wall of the indoor unit 3. An abutment shoulder 35 is formed, the inner flow guiding end 12 abutting against the abutment shoulder 35. Thereby, the positioning shoulder portion 114 and the abutting shoulder portion 35 can jointly form the axial positioning portion P2 to provide a better axial positioning effect between the air guiding tube body 1 and the indoor unit 3, and the The blocking member 4 can still be disposed between the positioning shoulder 114 and the second coupling end 34 such that the second coupling end 34 can indirectly abut against the positioning shoulder 114 via the blocking member 4.

The blocking member 4 may be a sealing ring made of a flexible material (for example, rubber), so that the blocking member 4 can be deformed when the air guiding tube body 1 is clamped with the indoor unit 3, so that The effect of sealing the gap d between the air duct body 1 and the indoor unit 3 is well achieved. Furthermore, the sealing ring may be an O-ring or a ring of other shapes. As shown in FIG. 6, the blocking member 4 may be a sealing ring having a circular cross section; or, as in the seventh Figure The blocking member 4 may be a sealing ring having a polygonal cross section. The blocking member 4 may also be a sealing ring having other shapes (for example, an elliptical shape or a wedge shape) in cross section, and the invention is not limited thereto.

With the design of the air guiding duct body 1, as shown in FIGS. 2 to 7, when the fan 14 is rotated, the airflow can be introduced from the air vent 21 of the cover 2 and the first air guiding port 111 to After the first flow guiding space 1a, the first air guiding opening 121, the first volume chamber 3a and the air outlet 31 are sequentially led to the internal space S2; and sequentially from the air inlet 32 and the second The chamber 3b and the fourth air guiding port 122 introduce the airflow into the second air guiding space 1b, and then lead to the external space S1 via the second air guiding opening 112 and the air vent 21 of the cover 2; The air flow of the outer space S1 and the inner space S2 can be alternated to provide a good circulation ventilation function.

In summary, the airflow exchange device of the present invention has the basic ventilation and ventilation function, and the above-mentioned blocking member 4 may be disposed at a joint portion between the air guiding pipe body 1 and the cover 2, or The blocking portion 4 is disposed at a joint portion between the air guiding pipe body 1 and the indoor unit 3, whereby the air guiding pipe body 1 and the cover 2 or the indoor unit 3 are closed by the blocking member 4. The gap d between the outer space S1, such as moisture, dust, or mosquitoes, is prevented from entering the inner space S2 through the first flow guiding space 1a or the second flow guiding space 1b. The isolation prevents the effect. Furthermore, the "axial positioning portions P1, P2" formed by the joint portion between the air guiding tube 1 and the cover 2 or the indoor unit 3 can also effectively prevent the cover 2 or the cover 2 The indoor unit 3 slides in any axial direction on the air guiding pipe body 1 due to an external force, thereby achieving the effect of improving the bonding stability.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

1‧‧‧air duct body

1a‧‧‧First Diversion Space

1b‧‧‧Second diversion space

11‧‧‧External diversion

111‧‧‧First air duct

112‧‧‧Second air vent

113‧‧‧ positioning shoulder

114‧‧‧ positioning shoulder

12‧‧‧Internal diversion

121‧‧‧ Third air duct

122‧‧‧fourth air vent

13‧‧‧Parts

14‧‧‧Fan

2 ‧ ‧ cover

21‧‧‧ vents

22‧‧‧ Filter

23‧‧‧First joint end

24‧‧‧Abut the shoulder

3‧‧‧ indoor unit

3a‧‧‧First room

3b‧‧‧Second room

31‧‧‧air outlet

32‧‧‧Air inlet

33‧‧‧Control Group

34‧‧‧Second junction

35‧‧‧Abut the shoulder

4‧‧‧Stop

D‧‧‧ gap

D1‧‧‧Inner reducing section

D2‧‧‧External diameter

D‧‧‧Separators

D1‧‧‧ mounting hole

S1‧‧‧External space

S2‧‧‧ interior space

L‧‧‧ axial

P1, P2‧‧‧ axial positioning

Claims (30)

An airflow switching device comprising: a wind guiding pipe body having an outer guiding end and an inner guiding end; and an indoor unit, the indoor unit being combined with the inner guiding of the air guiding body And a joint portion between the air guiding tube body and the indoor unit is provided with a blocking member and at least one axial positioning portion. The air flow switching device according to claim 1, wherein the inner air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body are formed. a positioning shoulder, the indoor unit has a second joint end facing the inner flow guiding end, the second joint end abuts against the positioning shoulder, and the second joint end is provided with an outer diameter reducing portion, the shrinking portion An abutting shoulder is formed between the diameter portion and the outer peripheral wall of the indoor unit, and the inner guiding end abuts against the abutting shoulder, and the positioning shoulder and the abutting shoulder together form the axial positioning portion. The air flow switching device according to claim 1, wherein the inner air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body are formed. a positioning shoulder, the indoor unit has a second joint end facing the inner flow guiding end, the second joint end abuts against the positioning shoulder, and the second joint end is provided with a reduced diameter portion, the contraction An abutting shoulder is formed between the diameter portion and the inner peripheral wall of the indoor unit, and the inner guiding end abuts against the abutting shoulder, and the positioning shoulder and the abutting shoulder together form the axial positioning portion. The air flow switching device of claim 1, wherein the indoor unit has a second joint end facing the inner flow end of the air duct body, and the second joint end is provided with an outer diameter reducing portion. An abutting shoulder is formed between the outer diameter reducing portion and the outer peripheral wall of the indoor unit, and the inner guiding end abuts against the abutting shoulder, and the abutting shoulder is the axial positioning portion. The air flow switching device of claim 1, wherein the indoor unit has a second joint end facing the inner flow guiding end of the air guiding duct body, and the inner air guiding end of the air guiding duct body is provided with an outer portion. a reducing portion, the outer diameter reducing portion and the outer peripheral wall of the air guiding tube body form a positioning shoulder, the second joint end abuts against the positioning shoulder, the positioning shoulder is the axial positioning portion . The air flow switching device of claim 1, 2, 3, 4 or 5, wherein the blocking member is a tape. The air flow switching device of claim 1, 2, 3, 4 or 5, wherein the blocker is a foam. The air flow switching device of claim 1, 2, 3, 4 or 5, wherein the blocking member is an adhesive. The air flow switching device according to claim 1, wherein the inner air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body are formed. a positioning shoulder, the indoor unit has a second joint end facing the inner flow guiding end, the second joint end abuts against the positioning shoulder, and the second joint end is provided with an outer diameter reducing portion, the shrinking portion An abutting shoulder is formed between the diameter portion and the outer peripheral wall of the indoor unit, the blocking member is a sealing ring, and the blocking member is disposed between the inner guiding end and the abutting shoulder, the inner guiding end The abutting shoulders respectively abut the two sides of the blocking member, and the positioning shoulder and the abutting shoulder together constitute the axial positioning portion. The air flow switching device according to claim 1, wherein the inner air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body are formed. a positioning shoulder, the indoor unit has a second joint end facing the inner flow guiding end, the resisting member is a sealing ring, and the blocking member is disposed between the positioning shoulder and the second joint end, the second The binding end and the positioning shoulder respectively abut the two sides of the blocking member, and the second bonding end is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the indoor unit An abutting shoulder is formed, the inner guiding end abuts against the abutting shoulder, and the positioning shoulder and the abutting shoulder together form the axial positioning portion. The air flow switching device of claim 1, wherein the indoor unit has a second joint end facing the inner flow end of the air duct body, and the second joint end is provided with an outer diameter reducing portion. An abutting shoulder is formed between the outer diameter reducing portion and the outer peripheral wall of the indoor unit, and the blocking member is a sealing ring, and the blocking member is disposed between the inner guiding end and the abutting shoulder, the inner guiding portion The flow end and the abutting shoulder respectively abut the two sides of the blocking member, and the abutting shoulder is the axial positioning portion. The air flow switching device of claim 1, wherein the indoor unit has a second joint end facing the inner flow guiding end of the air guiding duct body, and the inner air guiding end of the air guiding duct body is provided with an outer portion. a reducing portion, a positioning shoulder formed between the outer diameter reducing portion and the outer peripheral wall of the air guiding tube body, wherein the blocking member is a sealing ring, and the blocking member is disposed on the positioning shoulder portion and the second bonding end The second joint end and the positioning shoulder respectively abut the two sides of the blocking member, and the positioning shoulder is the axial positioning portion. The air flow switching device of claim 1, wherein the blocking member is a sealing ring made of a flexible material. The air flow switching device of claim 1, 2, 3, 4, 5, 9, 10, 11 or 12, wherein the air guiding body is internally connected to the external guiding end and the internal guiding current At least one fan is disposed between the ends. The airflow switching device of claim 14, wherein the indoor unit is provided with a control group electrically coupled to the fan. An airflow switching device includes: an air guiding pipe body having an outer guiding end and an inner guiding end; and a cover, the cover is coupled to the external guiding of the air guiding body The end portion of the air guiding tube body and the cover portion is provided with a blocking member and at least An axial positioning portion. The air flow switching device of claim 16, wherein the outer air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body are formed. a positioning shoulder having a first engaging end facing the outer guiding end, the first engaging end abutting the positioning shoulder, and the first joint end is provided with an outer diameter reducing portion An abutting shoulder is formed between the diameter portion and the outer peripheral wall of the cover, and the outer guiding end abuts against the abutting shoulder, and the positioning shoulder and the abutting shoulder together form the axial positioning portion. The air flow switching device according to claim 16, wherein the outer air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body are formed. a positioning shoulder having a first engaging end facing the outer guiding end, the first engaging end abutting the positioning shoulder, and the first engaging end is provided with a reduced diameter portion, the retracting An abutting shoulder is formed between the diameter portion and the inner peripheral wall of the cover, and the outer guiding end abuts against the abutting shoulder. The positioning shoulder and the abutting shoulder together form the axial positioning portion. The air flow switching device of claim 16, wherein the cover has a first joint end facing the outer flow end of the air duct body, and the first joint end is provided with an outer diameter reducing portion, An abutting shoulder is formed between the outer diameter reducing portion and the outer peripheral wall of the sleeve, and the outer guiding end abuts against the abutting shoulder, and the abutting shoulder is the axial positioning portion. The air flow switching device of claim 16, wherein the cover has a first joint end facing the outer flow guiding end of the air guiding tube body, and the outer air guiding end of the air guiding tube body is provided with an outer portion. a reducing portion, the outer diameter reducing portion and the outer peripheral wall of the air guiding tube body form a positioning shoulder, the first joint end abuts against the positioning shoulder, the positioning shoulder is the axial positioning portion . An air flow exchange device as described in claim 16, 17, 18, 19 or 20, The above blocking member is a tape. The air flow switching device of claim 16, wherein the blocker is a foam. The air flow switching device of claim 16, wherein the resisting member is an adhesive. The air flow switching device of claim 16, wherein the outer air guiding end of the air guiding pipe body is provided with an inner diameter reducing portion, and the inner diameter reducing portion and the inner peripheral wall of the air guiding pipe body are formed. a positioning shoulder having a first engaging end facing the outer guiding end, the first engaging end abutting the positioning shoulder, and the first joint end is provided with an outer diameter reducing portion An abutting shoulder is formed between the diameter portion and the outer peripheral wall of the cover, the blocking member is a sealing ring, and the blocking member is disposed between the outer guiding end and the abutting shoulder, the outer guiding end The abutting shoulders respectively abut the two sides of the blocking member, and the positioning shoulder and the abutting shoulder together constitute the axial positioning portion. The air flow switching device according to claim 16, wherein the outer air guiding end of the air guiding pipe body is provided with an outer diameter reducing portion, and the outer diameter reducing portion and the outer peripheral wall of the air guiding pipe body are formed. a locating shoulder, the sleeve has a first joint end facing the outer flow guiding end, the resisting member is a sealing ring, and the blocking member is disposed between the positioning shoulder and the first joint end, the first The joint end and the positioning shoulder respectively abut the two sides of the blocking member, and the first joint end is provided with an inner diameter reducing portion, and the inner diameter reducing portion forms an abutting shoulder with the inner peripheral wall of the sleeve. The outer flow guiding end abuts against the abutting shoulder, and the positioning shoulder and the abutting shoulder together form the axial positioning portion. The air flow switching device of claim 16, wherein the cover has a first joint end facing the outer flow end of the air duct body, and the first joint end is provided with an outer diameter reducing portion, An abutting shoulder is formed between the outer diameter reducing portion and the outer peripheral wall of the sleeve, the blocking member is a sealing ring, and the blocking member is disposed on the outer guiding end and the abutting shoulder The outer flow guiding end and the abutting shoulder respectively abut the two sides of the blocking member, and the abutting shoulder is the axial positioning portion. The air flow switching device of claim 16, wherein the cover has a first joint end facing the outer flow guiding end of the air guiding tube body, and the outer air guiding end of the air guiding tube body is provided with an outer portion. a reducing portion, a positioning shoulder formed between the outer diameter reducing portion and the outer peripheral wall of the air guiding tube body, wherein the blocking member is a sealing ring, and the blocking member is disposed on the positioning shoulder portion and the first bonding end The first joint end and the positioning shoulder respectively abut the two sides of the blocking member, and the positioning shoulder is the axial positioning portion. The airflow switching device of claim 16, wherein the barrier member is a sealing ring made of a flexible material. The air flow switching device of claim 16, wherein the inner air guiding body is internally connected to the outer air guiding end and the inner air guiding device. At least one fan is disposed between the ends. The air flow switching device of claim 16, wherein the cover is provided with a plurality of ventilations that communicate with the interior of the air duct body. The cover is provided with a filter screen inside the vent.