AIR EXCHANGE DEVICE

Abstract

An air exchange device includes: an air-guiding tube having a first end and a second end opposite to the first end, the first end having a first inlet and a first outlet, and the second end having a second inlet and a second outlet; a partition settled inside the air-guiding tube and dividing a room inside the air-guiding tube into a first air-guiding space and a second air-guiding space, the first air-guiding space communicating with the first inlet and second outlet, and the second air-guiding space communicating with the first outlet and the second inlet; a fan arranged with the air-guiding tube and adapted to induce an airflow; and a control module connecting with at least one of the first and second ends of the air-guiding tube and electrically connecting with the fan.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to an air exchange device and, more particularly, to an air exchange device for exchange of air inside and outside of a room.

2. Description of the Related Art

Referring to FIG. 1, a conventional air exchange device 9 settled in a building's wall or the housing of an electrical product is shown. Taking a wall 91 of a building as an example, the wall 91 is formed to separate an internal space and an external space. The wall 91 includes an inlet 911 and an outlet 912, and both inlet 911 and outlet 912 communicate the internal and external spaces, with a fan 92 settled across the inlet 911 and another fan 92 settled across the outlet 912. Therefore, when the fans 92 operates, air in the external space enters the internal space via the inlet 911, and air in the internal space is expelled via the outlet 912. Accordingly, the air exchange device 9 can exchange air inside and outside the building cyclically.

However, in order to settle this air exchange device 9, two through holes serving as the inlet 911 and outlet 912 are necessary, and this dual hole arrangement may result in decreasing of structural strength of the wall 91. Moreover, the necessary area on the surface of the wall 91 for these two through holes is so big that the use of the surface is thus largely limited. Besides, since a side of the fans 92 is exposed to the external space via the inlet 911 or the outlet 912, the heat and humidity of the external space may easily damage the fans 92, and thus lower the lifetime of the fans 92.

Furthermore, the fans 92 are conventionally connected with control modules composed by driving circuits, control circuits or other electronic elements, so that the fans 92 can be driven to inwardly or outwardly guide the air. However, since the control modules tend to generate a large amount of heat during the operations, an additional cooling sink or cooling device is required to lower the working temperature of said modules. This will increase the cost of the air exchange device 9.

Additionally, since the fans 92 are simply connected to the wall 91 without any sound-insulating design, the operational noise of the fans 92 can easily transmit to the environment as noise pollution.

SUMMARY OF THE INVENTION

What is needed is an air exchange device unnecessary to be mounted on a divider via two openings of this divider but still able to provide a desirable performance in air convection about the divider, to maintain the structural strength of the divider, and to provide an area of the surface of the divider large enough for any further use.

Another need is an air exchange device able to perform the air convection as well as to cool a control module.

A still another need is an air exchange device able to lower or shade the noise made during operation of the fan.

A further need is an air exchange device capable of increasing the structural strength of the divider without having to drill through holes on the divider.

A still further need is an air exchange device which ensures that the necessary amount of area of the divider is sufficient without having to drill through holes on the divider.

In one implementation, an air exchange device includes: an air-guiding tube having a first end and a second end opposite to the first end, the first end having a first inlet and a first outlet, and the second end having a second inlet and a second outlet; a partition settled inside the air-guiding tube and dividing a room inside the air-guiding tube into a first air-guiding space and a second air-guiding space, the first air-guiding space communicating with the first inlet and second outlet, and the second air-guiding space communicating with the first outlet and the second inlet; a fan arranged with the air-guiding tube and adapted to induce an airflow; and a control module connecting with at least one of the first and second ends of the air-guiding tube and electrically connecting with the fan.

In this implementation, one or more of the following features may be included: the control module connects with the second end of the air-guiding tube, and at least one of the second inlet and second outlet faces the control module; the control module has a housing with an opening, an auxiliary outlet, and an auxiliary inlet, the housing connects with the second end of the air-guiding tube by an edge defining the opening, and the opening communicates with the second inlet and the second outlet; a board is disposed inside the housing, divides an inner room of the housing into a first branch space and a second branch space, and also divides the opening into a first section and a second section, wherein the first branch space communicates with the first section and the auxiliary outlet, and wherein the second branch space communicates with the second section and the auxiliary inlet; a driving circuit or control circuit is disposed in the first branch space or the second branch space and electrically connects with the fan; a light emitter is arranged inside the first branch space or the second branch space; an alarm is arranged inside the first branch space or the second branch space; a negative air ions generator is arranged inside the first branch space or the second branch space; the fan is settled inside the first air-guiding space, the control module has an auxiliary fan disposed in the second branch space of the housing and aligned with the second air-guiding space through the second section, and a driving circuit or a control circuit is disposed inside the second branch space and electrically connects with the fan; the fan is settled inside the second air-guiding space, the control module has an auxiliary fan disposed in the first branch space of the housing and aligned with the first air-guiding space through the first section, and a driving circuit or control circuit is disposed inside the first branch space and electrically connects with the fan; the first end of the air-guiding tube has a first surface and a second surface adjacent to or opposite to each other, at least one bent portion is formed between the first and second surfaces, the first inlet is formed in the first surface, and the first outlet is formed in the second surface; the first end of the air-guiding tube has a first surface and a second surface adjacent to each other, a bent portion is formed between the first and second surfaces, the first inlet is formed in the first surface, and the first outlet is formed in the second surface; the partition has a first section, a second section and an inclined connecting section linking the first and second sections; the fan is arranged inside the first air-guiding space or second air-guiding space; the fan is arranged inside the first air-guiding space, and the control module has an auxiliary fan corresponding to the second air-guiding space; the fan is arranged inside the second air-guiding space, and the control module has an auxiliary fan corresponding to the first air-guiding space; the air exchange device further comprising another fan, with the two fans arranged inside the first and second air-guiding spaces respectively; the air-guiding tube is a tube with an adjustable axial length; the air-guiding tube further has a sleeve moveably mounted on the first end, the sleeve independently forms a first room and a second room inside, two apertures are formed in the wall of the sleeve and communicate with the first and second rooms respectively, the first room communicates with the first air-guiding space, and the second room communicates with the second air-guiding space; the first inlet or first outlet of the air-guiding tube has a filter; the auxiliary inlet or auxiliary outlet has a filter; a layer of sound-insulating material is applied to an inner surface of the air-guiding tube; the fan electrically connects with a rotation control circuit; the auxiliary fan electrically connects with a rotation control circuit; the air exchange device further comprising a cover connecting with the air-guiding tube and covering the first end of the air-guiding tube; the cover comprises an inner wall spaced from the first inlet and the first outlet; the cover has an opening; and a filter is mounted in the opening.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinafter and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, including:

FIG. 1 is a cross-sectional view of a conventional air exchange device.

FIG. 2 is a perspective view of an air exchange device according to a preferred embodiment of the present disclosure.

FIG. 3 is a cross-sectional view of the air exchange device.

FIG. 4 is a cross-sectional view of the air exchange device with an arrow showing a shift motion of a sleeve.

FIG. 5 is a cross-sectional view of an air exchange device according to another preferred embodiment of the present disclosure.

FIG. 6 is a cross-sectional view of an air exchange device with an auxiliary fan.

FIG. 7 is a sketch diagram showing the connection among a rotation control circuit, a fan and an auxiliary fan of an air exchange device according to the present disclosure.

FIG. 8 is a cross-sectional view of an air exchange device with a cover.

In the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the term “first,” “second,” “inner,” “external,” “internal,” “downwards,” and similar terms are used hereinafter, it should be understood that these terms refer only to the structure shown in the drawings as it would appear to a person viewing the drawings, and are utilized only to facilitate describing the invention.

DETAILED DESCRIPTION OF THE INVENTION

In the following contents, a “divider” is a structure adapted to separate an external space and an internal space. For example, when a housing of an electronic product serves as the divider, the external space is the space outside the housing, and the internal space is the space inside the housing. As another example, when a wall of a building serves as the divider, the external space is the space outside the building, and the internal space is the space inside the building. Furthermore, in the following contents, a “control module” is a module including electronic elements, such as driving circuit, control circuit, or user interface, which is capable of fan driving and control, for controlling the operation of a disclosed air exchange device. Besides, according to user's need, the control module can also include various electronic members with function of lighting, alarm, or air-filtering, such as light emitter, alarm, and negative air ions generator.

Referring to FIGS. 2 and 3, the air exchange device of the preferred embodiment of this disclosure is mounted on a divider “D,” with a first side of the divider “D” exposing to an external space “S1” and a second side of the divider “D,” opposite to the first side, exposing to an internal space “S2.” The divider “D” has a through hole “D1” extending from the first side to the second side. This air exchange device includes an air-guiding tube 1, a partition 2, a fan 3, and a control module 4. The air-guiding tube 1 is arranged in and extending through the through hole “D1.” The partition 2 and the fan 3 are settled inside the air-guiding tube 1. The control module 4 electrically connects with the fan 3.

The air-guiding tube 1 can be a tube with any kind of sectional shape, and the one shown in FIG. 2 is a tube with round sectional shape. The air-guiding tube 1 has a first end 11 and a second end 12 opposite to the first end 11. For guiding air to enter or exit the air-guiding tube 1, the first end 11 has a first inlet 111 and a first outlet 112, and the second end 12 has a second inlet 121 and a second outlet 122.

The partition 2 settled inside the air-guiding tube 1 can be integrally formed within the air-guiding tube 1 or detachably connected with the air-guiding tube 1. Specifically, the partition 2 divides the room inside the air-guiding tube 1 into two independent spaces: a first air-guiding space 21 and a second air-guiding space 22. In this embodiment, the partition 2 includes a first section 2a, a second section 2b and an inclined connecting section 2c, which links the first and second sections 2a, 2b. With the inclined connecting section 2c, airflow can be smoothly guided from the first section 2a to the second section 2b.

The fan 3 settled inside the air-guiding tube 1 is adapted to generate airflow. The position of the fan 3 is not limited as long as the airflow generated by the fan 3 can finally enter or exit the air-guiding tube 1. For example, the fan 3 can be arranged in the first air-guiding space 21 or second air-guiding space 22; specifically, the fan 3 can be arranged at the first inlet 111, the first outlet 112, the second inlet 121, or the second outlet 122. Therefore, it is not necessary to largely increase the size of the air-guiding tube 1 for containing the fan 3. Alternatively, there can also be another fan 3 settled inside the air-guiding tube 1 as shown in FIGS. 2 and 3, and the two fans 3 are arranged in the first and second air-guiding spaces 21, 22 respectively, so as to improve the air-driving efficiency. Specifically, with the fan 3 settled inside the air-guiding tube 1, the air-guiding tube 1 can provide a certain degree of sound insulation to lower the noise pollution around the air-guiding tube 1 when the fan 3 operates. Particularly, the efficiency of sound insulation can be further improved if a layer of sound-insulating material is applied to the inner surface of the air-guiding tube 1. The fan 3 has a structure designed to be driven by a motor, such as axial fan, centrifugal fan, blower, or exchange fan.

The control module 4 connects with at least one of the first and second ends 11, 12 of the air-guiding tube 1 integrally or detachably, and the control module 4 also electrically connects with and operates the fan 3. Preferably, the control module 4 connects with the second end 12 and is disposed in the internal space “S2,” so that the repair and maintenance processes of the control module 4 can be easily performed when the divider “D” is a wall of a building. The control module 4 is preferably in a position where at least one of the second inlet 121 and second outlet 122 faces, so that the heat generated by the control module 4 can be easily dispelled when the airflow driven by the fan 3 enters or exits the air-guiding tube 1. In this embodiment, the control module 4 has a housing 41. The housing 41 has an opening 411, an auxiliary outlet 412 and an auxiliary inlet 413, with the housing 41 connecting with the second end 12 by an edge defining the opening 411. The opening 411 communicates with the second inlet 121 and second outlet 122. A board 42 is disposed inside the housing 41 and across the opening 411, so as to divide the inner room of the housing 41 into a first branch space 41a and a second branch space 41b, and also to divide the opening 411 into a first opening 411a and a second opening 411b. Specifically, the first branch space 41a communicates with the first opening 411a and the auxiliary outlet 412; and the second branch space 41b communicates with the second opening 411b and the auxiliary inlet 413. Besides, the first opening 411a faces the second outlet 122, and the second opening 411b faces the second inlet 121. With the above arrangement, when a driving circuit or control circuit of the fan 3 is disposed in the first branch space 41a or the second branch space 41b and electrically connects with the fan 3, the heat generated by this circuit can be dissipated by the airflow passing through the first branch space 41a or the second branch space 41b. Furthermore, an electronic member with function of lighting, alarm, or air-filtering can also be arranged inside the first branch space 41a or the second branch space 41b. The electronic member is adapted to provide said function of lighting, alarm, or air-filtering, therefore, the electronic member may be a light emitter, an alarm, or a negative air ions generator.

Referring to FIG. 3, in use of the disclosed air exchange device, only one hole, that is, the through hole “D1” in the divider “D” is necessary. With the air-guiding tube 1 arranged in and extending through the through hole “D1,” the airflow from the external space “S1” passes through the first inlet 111, the first air-guiding space 21, the second outlet 122, the first section 411a, the first branch space 41a, and the auxiliary outlet 412 sequentially, so as to enter the internal space “S2.” On the other hand, a reverse airflow from the internal space “S2” passes through the auxiliary inlet 413, the second branch space 41b, the second opening 411b, the second inlet 121, the second air-guiding space 22, and the first outlet 112 sequentially, so as to be expelled to the external space “S1.” In this way, the disclosed air exchange device can be functioned for air convection.

Referring to FIGS. 3 and 4 now, preferably, the axial length of the air-guiding tube 1 is able to be adjusted. In order to implement the above idea, the air-guiding tube 1 may further include a sleeve 13 moveably mounted on the first end 11. The sleeve 13 independently includes a first room 131 and a second room 132 inside, and two apertures 133 are formed in the wall of the sleeve 13 and communicate with the first and second rooms 131, 132 respectively. The first room 131 communicates with the first air-guiding space 21 and the second room 132 communicates with the second air-guiding space 22. Specifically, the first room 131 and second room 132 serve as extensions of the first air-guiding space 21 and second air-guiding space 22, and the apertures 133 respectively serve as inlet and outlet of the air-guiding tube 1. As a result, referring to the arrow shown in FIG. 4, with the shift of the sleeve 13 in an axial direction of the air-guiding tube 1, positions of the inlet and outlet toward the external space “S1,” which are the apertures 133 now, can be adjusted according to need.

Additionally, referring to FIGS. 2 and 3 again, positions of the first inlet 111, first outlet 112, second inlet 121, and second outlet 122 are not limited. In this embodiment, the first inlet 111 and first outlet 112 face in the same direction. Alternatively, in order to provide different performance in air convection, as shown in FIG. 5, the first end 11 in the external space “S1” includes a first surface 11a and a second surface 11b, which are non-coplanar surfaces with at least one bent portion 113 formed between the first and second surfaces 11a, 11b. For example, when there is only one bent portion 113 formed between and linking the first and second surfaces 11a, 11b, they are two adjacent and non-coplanar surfaces; alternatively, if there are more than one bent portions 113, the first and second surfaces 11a, 11b, are two opposite and non-coplanar surfaces. Specifically, the first inlet 111 is formed in the first surface 11a, and the first outlet 112 is formed in the second surface 11b. With the above arrangement, the first inlet 111 and the first outlet 112 face in different directions due to the bent portion 113 between the first and second surfaces 11a, 11b, so that the airflow going to enter the air-guiding tube 1 and the other airflow expelled thereby do not disturb each other. Preferably, the first surface 11a is perpendicular to the second surface 11b, so that the airflow may enter the air-guiding tube 1 via the first inlet 111 in a direction perpendicular to the axial direction of the air-guiding tube 1, and the other airflow may exit the air-guiding tube 1 via the first outlet 112 in a direction parallel to the axial direction of the air-guiding tube 1. Therefore, an improved performance of air convection is thus provided since airflow disturbance is efficiently avoided. Moreover, at least one of the first inlet 111, first outlet 112, auxiliary outlet 412, and auxiliary inlet 413, especially the auxiliary outlet 412 or auxiliary inlet 413, may have a filter 14 to avoid unwanted object such as dust or insects entering the air-guiding tube 1. When the filter 14 is arranged at the auxiliary outlet 412 or auxiliary inlet 413, the filter 14 is inside the internal space “S2” and may provide a preferable filtering performance. Besides, maintenance or replacement of the filter 14 in the internal space “S2” can be easily performed when the divider “D” is a wall of a building.

Referring to FIG. 6 now, when the fan 3 is settled inside the second air-guiding space 22, the control module 4 may further include an auxiliary fan 43 aligning with the first air-guiding space 21. Specifically, the auxiliary fan 43 is disposed in the first branch space 41a of the housing 41, so that the auxiliary fan 43 aligns with the first air-guiding space 21 through the first opening 411a. By the auxiliary fan 43 of the control module 4, if the driving circuit or control circuit is disposed inside the first branch space 41a, the heat generated by the driving circuit or control circuit can be dispelled rapidly. Furthermore, since the auxiliary fan 43 corresponds with the first air-guiding space 21, the auxiliary fan 43 can provide functions similar to those of fan 3, such as helping performance of air convection. Alternatively, the auxiliary fan 43 may be disposed in the second branch space 41b if the fan 3 is settled in the first air-guiding space 21, so that the auxiliary fan 43 aligns with the second air-guiding space 22 through the second opening 411b. Accordingly, the auxiliary fan 43 not only rapidly dispels the heat generated by the driving circuit or control circuit if the driving circuit or control circuit is disposed inside the second branch space 41b, but also helps performance of air convection.

Referring to FIG. 7, at least one of the fan 3 and the auxiliary fan 43 electrically connects with a rotation control circuit 5, which is adapted to control the fan 3 or auxiliary fan 43 to rotate in a forward direction or a reverse direction. Therefore, when the rotation control circuit 5 controls the fan 3 or the auxiliary fan 43 to rotate in a first direction, the airflow induced by the fan 3 or the auxiliary fan 43 goes in a way shown by the arrow “I” in FIG. 3 or 6 for air convection; when the rotation control circuit 5 controls the fan 3 or the auxiliary fan 43 to rotate in a second direction, the airflow induced by the fan 3 or the auxiliary fan 43 goes in a reverse way of the arrow “I” in FIG. 3 or 6 for expelling the dust from inside the air-guiding tube 1 to prevent the first inlet 111 from being blocked by the accumulated dust. As such, the dust will not accumulate in the air-guiding tube 1 and hinder the air from entering the air-guiding tube 1, thereby maintaining an ideal performance of air convection. Specifically, the rotation control circuit 5 may decide the timing to change the rotational direction of the fan 3 or auxiliary fan 43. For example, the fan 3 or auxiliary fan 43 may be cyclically controlled to rotate in the first direction for a convection time, such as 30-60 minutes, and then be reversely controlled to rotate in the second direction for a cleaning time, such as 10-20 seconds. Alternatively, the cleaning time can be arranged to be prior to the convection time.

Referring to FIG. 8, the disclosed air exchange device may further include a cover 6 in the external space “S1,” connecting with the air-guiding tube 1, and covering the first end 11 of the air-guiding tube 1, with the cover 6 having an opening 61. With this cover 6, the air-guiding tube 1 does not expose to external factors in the external space “S1,” such as humidity, wind, and dust, and the look of the air exchange device is also improved. Specifically, the cover 6 comprises an inner wall spaced from the first inlet 111 and the first outlet 112 for the air in the external space “S1” to smoothly enter the air-guiding tube 1 via the opening 61 and the inlet 111, or for the air in the air-guiding tube 1 to be expelled to the external space “S1” via the outlet 112 and the opening 61. Besides, when the divider “D” is a lateral wall of a building or a lateral side of a housing, the opening 61 faces downwards preferably, so as to relieve the accumulation of dust. Furthermore, there can also be another filter 14 mounted in the opening 61 to avoid unwanted object entering the air-guiding tube 1.

In sum, with the above illustrated air exchange device, for air convection between the external space “S1” and the internal space “S2,” only the single through hole “D1” has to be set in the divider “D” for arrangement of this air exchange device. Therefore, the structural strength of the divider “D” is maintained, and the necessary amount of area of the divider “D” is also significantly limited. Moreover, the area of the air exchange device exposed to the external space “S1” is small, and thus damages caused by heat or humidity can be efficiently avoided. As a result, the disclosed air exchange device has advantages such as high efficiency in cooling and air-convection, long lifetime, and high degree in convenience of usage.

Additionally, since the fan 3 is settled inside the air-guiding tube 1, the internal space “S2” can get ride of the noise pollution due to the operational sound of the fan 3, especially when most parts of the air-guiding tube 1 and the fan 3 are outside the internal space “S2.” Besides, with the control module 4 connecting with the second end 12 of the air-guiding tube 1 and corresponding to the second inlet 121 and second outlet 122, the heat generated by the control module 4 can be dissipated when airflows are induced by the fan 3. Therefore, there is no need to additionally arrange any fin or fan for cooling the control module 4, and thus the cost of the air exchange device is limited.

Although the invention has been described in detail with reference to its presently preferable embodiments, it will be understood by one of ordinary skill in the art that various modifications can be made without departing from the spirit and the scope of the invention, as set forth in the appended claims.

Claims

1. An air exchange device, comprising:

an air-guiding tube having a first end and a second end opposite to the first end, the first end having a first inlet and a first outlet, and the second end having a second inlet and a second outlet;

a partition settled inside the air-guiding tube and dividing a room inside the air-guiding tube into a first air-guiding space and a second air-guiding space, the first air-guiding space communicating with the first inlet and second outlet, and the second air-guiding space communicating with the first outlet and the second inlet;

a fan arranged with the air-guiding tube and adapted to induce an airflow; and

a control module connecting with at least one of the first and second ends of the air-guiding tube and electrically connecting with the fan.

2. The air exchange device as claimed in claim 1, wherein the control module connects with the second end of the air-guiding tube, and at least one of the second inlet and second outlet faces the control module.

3. The air exchange device as claimed in claim 2, wherein the control module has a housing with an opening, an auxiliary outlet, and an auxiliary inlet, the housing connects with the second end of the air-guiding tube by an edge defining the opening, and the opening communicates with the second inlet and the second outlet.

4. The air exchange device as claimed in claim 3, wherein a board is disposed inside the housing, divides an inner room of the housing into a first branch space and a second branch space, and also divides the opening into a first opening and a second opening, wherein the first branch space communicates with the first opening and the auxiliary outlet, and wherein the second branch space communicates with the second opening and the auxiliary inlet.

5. The air exchange device as claimed in claim 4, wherein a driving circuit or a control circuit is disposed in the first branch space or the second branch space and electrically connects with the fan.

6. The air exchange device as claimed in claim 4, wherein a light emitter is arranged in the first branch space or the second branch space.

7. The air exchange device as claimed in claim 4, wherein an alarm is arranged in the first branch space or the second branch space.

8. The air exchange device as claimed in claim 4, wherein a negative air ions generator is arranged in the first branch space or the second branch space.

9. The air exchange device as claimed in claim 4, wherein the fan is settled in the first air-guiding space, the control module has an auxiliary fan disposed in the second branch space of the housing and aligned with the second air-guiding space through the second section, and a driving circuit or a control circuit is disposed inside the second branch space and electrically connects with the fan.

10. The air exchange device as claimed in claim 4, wherein the fan is settled in the second air-guiding space, the control module has an auxiliary fan disposed in the first branch space of the housing and aligned with the first air-guiding space through the first opening, and a driving circuit or a control circuit is disposed inside the first branch space and electrically connects with the fan.

11. The air exchange device as claimed in claim 1, wherein the first end of the air-guiding tube has a first surface and a second surface adjacent to or opposite to each other, at least one bent portion is formed between the first and second surfaces, the first inlet is formed in the first surface, and the first outlet is formed in the second surface.

12. The air exchange device as claimed in claim 1, wherein the first end of the air-guiding tube has a first surface and a second surface adjacent to each other, a bent portion is formed between the first and second surfaces, the first inlet is formed in the first surface, and the first outlet is formed in the second surface.

13. The air exchange device as claimed in claim 1, wherein the partition has a first section, a second section and an inclined connecting section linking the first and second sections.

14. The air exchange device as claimed in claim 1, wherein the fan is arranged in the first air-guiding space or second air-guiding space.

15. The air exchange device as claimed in claim 14, wherein the fan is arranged in the first air-guiding space, and the control module has an auxiliary fan corresponding to the second air-guiding space.

16. The air exchange device as claimed in claim 14, wherein the fan is arranged in the second air-guiding space, and the control module has an auxiliary fan corresponding to the first air-guiding space.

17. The air exchange device as claimed in claim 14, further comprising another fan, with the two fans arranged in the first and second air-guiding spaces respectively.

18. The air exchange device as claimed in claim 1, wherein the air-guiding tube is a tube with an adjustable axial length.

19. The air exchange device as claimed in claim 18, wherein the air-guiding tube further has a sleeve moveably mounted on the first end, the sleeve independently forms a first room and a second room inside, two apertures are formed in the wall of the sleeve and communicate with the first and second rooms respectively, the first room communicates with the first air-guiding space, and the second room communicates with the second air-guiding space.

20. The air exchange device as claimed in claim 1, wherein the first inlet or first outlet of the air-guiding tube has a filter.

21. The air exchange device as claimed in claim 3, wherein the auxiliary inlet or auxiliary outlet has a filter.

22. The air exchange device as claimed in claim 1, wherein a layer of sound-insulating material is applied to an inner surface of the air-guiding tube.

23. The air exchange device as claimed in claim 1, wherein the fan electrically connects with a rotation control circuit.

24. The air exchange device as claimed in claim 9, wherein the auxiliary fan electrically connects with a rotation control circuit.

25. The air exchange device as claimed in claim 10, wherein the auxiliary fan electrically connects with a rotation control circuit.

26. The air exchange device as claimed in claim 15, wherein the auxiliary fan electrically connects with a rotation control circuit.

27. The air exchange device as claimed in claim 16, wherein the auxiliary fan electrically connects with a rotation control circuit.

28. The air exchange device as claimed in claim 1, further comprising a cover connecting with the air-guiding tube and covering the first end of the air-guiding tube.

29. The air exchange device as claimed in claim 28, wherein the cover comprises an inner wall spaced from the first inlet and the first outlet.

30. The air exchange device as claimed in claim 28, wherein the cover has an opening.

31. The air exchange device as claimed in claim 30, wherein a filter is mounted in the opening.