Fresh air machine

Abstract

The present invention discloses a fresh air blower, comprising: a first housing, a second housing, and a heat exchange core. One side edge of the end face of the other end of the second housing is rotatably connected to one side edge of the end face of the other end of the first housing, so that the first housing and the second housing can be rotated to a state where the two ends are docked or rotated to a folded state; when the first housing and the second housing can be rotated to the state where the two ends are docked, it is installed in the first housing and / or the second housing. The first air outlet is communicated with the fourth air outlet through a duct and passing through the heat exchange core, and the second air outlet is communicated with the third air outlet through a duct and passing through the heat exchange core; when the first housing and the second housing are rotated to the folded state, the heat exchange core is disassembled, so that the two ends of the first housing and the second housing are directly communicated. Through the body folding technology, the present invention can achieve dual functions with one machine. It can be used as a unidirectional fresh air blower to achieve the function of rapid air change; and it can also be used as a bidirectional fresh air blower to achieve the function of heat exchange.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air fans, and particularly to a fresh air fan. Background Art

[0002] At present, the fresh air fans sold on the market are usually of two types: unidirectional flow fresh air fans and bidirectional flow fresh air fans. The unidirectional flow fresh air fan is mainly used to supply air into the room. Its function is to quickly introduce fresh air into the room, accelerate the air renewal, and improve the indoor air quality. On the other hand, the bidirectional flow fresh air fan realizes air circulation and heat exchange during the air exchange process, can maintain a stable temperature of the indoor air, and save energy consumption. In actual use, we often face a trade-off between the air exchange speed and heat exchange. Sometimes, we need to quickly exchange air, for example, when the indoor air pollution is serious or the odor needs to be quickly dispersed. And sometimes, we hope to keep the indoor temperature stable and reduce energy consumption, especially when air conditioning is required in winter or summer. However, the traditional unidirectional flow fresh air fans and bidirectional flow fresh air fans cannot meet these requirements. Summary of the Invention

[0003] In order to solve the technical problem that the structure of the fresh air fan in the above-mentioned prior art is fixed and cannot be switched into a unidirectional flow or bidirectional flow fresh air fan, the present invention provides a fresh air fan.

[0004] The technical solution adopted by the present invention is as follows:

[0005] The present invention provides a fresh air fan, comprising:

[0006] A first housing, one end of which is provided with an air outlet, and a duct and a first fan are arranged inside;

[0007] A second housing, one end of which is provided with an air outlet, and a duct and a second fan are arranged inside; one side edge of the other end of the second housing is rotatably connected to one side edge of the other end of the first housing, so that the first housing and the second housing can be rotated to a state where the two ends are butted or rotated to a folded state;

[0008] A heat exchange core body, when the first housing and the second housing are rotated to the state where the two ends are butted, the heat exchange core body is installed in the first housing and / or the second housing, and the air outlet of the first housing is communicated with the air duct and the air outlet of the second housing through its air duct and passing through the heat exchange core body; when the first housing and the second housing are rotated to the folded state, the heat exchange core body is disassembled, and the air outlets at one end of the first housing and the second housing are directly communicated with the other end.

[0009] Further, one end of the first housing is provided with a first air outlet and a second air outlet, and one end of the second housing is provided with a third air outlet and a fourth air outlet. When the first housing and the second housing can be rotated to the state of butt-joint at both ends, the first air outlet is communicated with the fourth air outlet through a duct and via the heat exchange core, and the second air outlet is communicated with the third air outlet through a duct and via the heat exchange core.

[0010] Specifically, when the first housing and the second housing are rotated to the folded state, the first housing is parallel and located above the second housing.

[0011] Further, when the first housing and the second housing are in the state of butt-joint at both ends, an installation cavity for installing the heat exchange core is formed.

[0012] Further, a rotating shaft is provided at the middle position above the installation cavity to connect the rotating sides of the first housing and the second housing. Two detachable splicing plates are arranged below the installation cavity, and the two splicing plates are respectively installed on the first housing and the second housing. The heat exchange core can be taken out by disassembling the two splicing plates.

[0013] Further, a plurality of mounting seats for passing through the rotating shaft are provided on the rotating side of the second housing, and the first housing is fixedly connected to the side surface of the rotating shaft.

[0014] The present invention further includes: a gear installed at the end of the rotating shaft, a motor for driving the gear to rotate, a plurality of position sensors for sensing the rotating position of the first housing and emitting induction signals, and a controller for receiving a state switching instruction and controlling the rotation of the motor to switch the position states of the first housing and the second housing according to the induction signals.

[0015] Specifically, the plurality of position sensors include a first position sensor group, and the position sensors of the first position sensor group are respectively arranged on the fitting surfaces of the first housing and the second housing that are in contact after folding. When the first housing and the second housing are rotated to the folded state of being parallel up and down, the two position sensors of the first position sensor group are in contact and emit a first induction signal.

[0016] Specifically, the plurality of position sensors further include a second position sensor group, and the position sensors of the second position sensor group are respectively arranged at the splicing joints of the first housing and the second housing. When the first housing and the second housing are rotated to the butt-joint state, the two position sensors of the second position sensor group are in contact and emit a second induction signal.

[0017] Further, a sealing strip is provided at the butt-joint of the first housing and the second housing.

[0018] Compared with the prior art, in the present invention, the housing of the fresh air fan is designed to be foldable. When rapid ventilation is required, the user can unfold the fresh air fan and use it in the unidirectional flow mode. Fresh air will be quickly introduced to achieve rapid air renewal and effectively improve the indoor air quality. When the user hopes to conduct heat exchange and stabilize the indoor temperature, the fresh air fan can be folded up and used in the bidirectional flow mode. In this mode, the fresh air fan realizes heat transfer between the indoor air and the outdoor air through the heat exchange core, maintains the stability of the indoor temperature, and saves energy consumption at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic diagram of the structure in the embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of the butt joint state at both ends in the embodiment of the present invention;

[0022] Figure 3 is a schematic diagram during the folding process in the embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the folded state in the embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram in the embodiment of the present invention;

[0025] 1. First housing;

[0026] 11. First air outlet; 12. Second air outlet; 13. First partition; 15. First fan;

[0027] 2. Second housing;

[0028] 21. Second partition; 23. Third air outlet; 24. Fourth air outlet; 25. Second fan;

[0029] 3. Heat exchange core;

[0030] 4. Rotating shaft;

[0031] 5. Folding plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The principle and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0034] The fresh air ventilators sold on the market at present are divided into two types: unidirectional flow fresh air ventilators and bidirectional flow fresh air ventilators. The main function of the unidirectional flow fresh air ventilator is to quickly introduce fresh air into the room to improve the indoor air quality and accelerate air renewal. On the other hand, the bidirectional flow fresh air ventilator realizes the stable circulation of air through circulation and heat exchange, and effectively saves energy consumption. In actual use, we often face the choice between the ventilation speed and heat exchange. Sometimes, we need to ventilate quickly, for example, when the indoor air pollution is serious or when we need to quickly eliminate odors. And sometimes, we hope to keep the indoor temperature stable and reduce energy consumption, especially in winter or summer when air conditioning is required. The traditional unidirectional flow fresh air ventilator and bidirectional flow fresh air ventilator cannot meet these requirements at the same time. The present invention aims to solve this problem and proposes an innovative fresh air ventilator with interchangeable unidirectional flow and bidirectional flow, which adopts an innovative body folding technology to realize the function of one machine with two uses. It can be used as a unidirectional flow fresh air ventilator to provide a quick ventilation function, or it can be transformed into a bidirectional flow fresh air ventilator to realize the heat exchange function.

[0035] As Figure 1 shown, the present invention proposes a fresh air ventilator, including: a first housing 1, a second housing 2 and a heat exchange core 3. One end of the first housing 1 is provided with a first air outlet 11 and a second air outlet 12, and a duct and a first fan 15 are arranged inside. The first air outlet 11 and the second air outlet 12 are used for ventilation in and out, and the first fan 15 is responsible for pushing the air flow through the duct; one end of the second housing 2 is provided with a third air outlet 23 and a fourth air outlet 24, and a duct and a second fan 25 are arranged inside. The third air outlet 23 and the fourth air outlet 24 are used for ventilation in and out, and the second fan 25 and its internal duct generate an air flow. The first housing 1 and the second housing 2 are connected in a rotatable manner. Specifically, one side edge of the other end of the first housing 1 is rotatably connected to one side edge of the other end of the second housing 2, which enables the first housing 1 and the second housing 2 to be rotated to the butt joint state or the folded state at both ends. This design of the present invention enables the fresh air ventilator to be unfolded and butted or folded according to needs to achieve different mode switching. As Figure 1 、 5As shown, when the first housing 1 and the second housing 2 can be rotated to the end-to-end docking state, the heat exchange core 3 is installed inside the first housing 1 and the second housing 2, specifically located between the first housing 1 and the second housing 2. The heat exchange core 3 is a heat exchange core with heat exchange function. Specifically, the first air outlet 11 and the second air outlet 12 are located on the outdoor side, and the third air outlet 23 and the fourth air outlet 24 are located on the indoor side. The first air outlet 11 is connected to the fourth air outlet 24 through a duct and passing through the heat exchange core 3. At the same time, the second air outlet 12 is connected to the third air outlet 23 through a duct and passing through the heat exchange core 3. In this way, heat transfer between indoor air and outdoor air is achieved through the heat exchange core 3, thus providing the function of heat exchange.

[0036] According to the above description, the working mode of the fresh air fan is as follows:

[0037] As Figures 2 to 4 shown, when rapid ventilation is required, the user can fold the fresh air fan and use it in the unidirectional flow mode. In this mode, the fresh air fan quickly introduces fresh air. The first housing 1 and the second housing 2 are arranged parallel to each other side by side vertically. Powered by the first and second fans, fresh outdoor air is introduced from the air outlets at one end of the first housing 1 and the second housing 2, and then exhausted from the other end of the first housing 1 and the second housing 2 into the room, realizing rapid air renewal and effectively improving indoor air quality.

[0038] When the user hopes to conduct heat exchange and stabilize the indoor temperature, the fresh air fan can be unfolded and docked to switch to the bidirectional flow mode. In this mode, the fresh air fan realizes heat transfer between indoor air and outdoor air through the heat exchange core 3, thereby maintaining the stability of the indoor temperature and saving energy consumption.

[0039] In other embodiments, the fresh air fan can also have only one air outlet at both ends, that is, one air outlet is provided at one end of the first housing, and one air outlet is provided at one end of the second housing. A heat exchange core is arranged between the first housing 1 and the second housing 2. The heat exchange core only has the heat exchange function and does not have the heat exchange function. That is, the heat exchange core 3 is connected to the air conditioning system through a pipeline. When rapid fresh air intake is required and heat exchange function is not needed, the heat exchange core can be disassembled, and the first housing and the second housing can be folded and arranged side by side vertically, and fresh air can be introduced through the fan.

[0040] As Figure 1 、 2As shown in the figure, specifically, the first housing 1 and the second housing 2 are in the shape of a square box. Two air inlets are arranged side by side at the left end of the first housing 1, and the right end face is open. A first partition 13 is provided at a position parallel to the right end face inside the first housing 1. The area between the first partition 13 and the open area of the right end face is used to install the left half of the heat exchange core. Ventilation openings corresponding to the first air inlet 11 and the second air inlet 12 are provided on the first partition 13. Two air inlets are arranged side by side at the right end of the second housing 2, and the left end face is open. At the same time, a second partition 21 is provided at a position parallel to the left end face inside the second housing 2. The area between the second partition 21 and the open area of the right end face of the second housing 2 is used to install the right half of the heat exchange core. That is, when the first housing 1 and the second housing 2 are rotated to the butt joint state at both ends, the area between the first partition 13 and the second partition 21 is the installation cavity for installing the heat exchange core.

[0041] In addition, as Figure 2 shown, when the first housing 1 and the second housing 2 are rotated to the butt joint state to install the heat exchange core, the left half of the heat exchange core divides the installation cavity of the first housing 1 into upper and lower first air chambers and second air chambers, and the right half of the heat exchange core divides the installation cavity of the second housing 2 into upper and lower third air chambers and fourth air chambers. And due to the internal structure of the heat exchange core (specific duct details, the internal structure of the heat exchange core and the specific air inlet and outlet sides of the heat exchange core are prior arts and will not be specifically described in detail), the upper left first air chamber communicates with the lower right fourth air chamber, and the lower left second air chamber communicates with the upper right third air chamber. The first partition 13 can be provided with strip-shaped air holes arranged up and down. The first air inlet 11 communicates with the strip-shaped air holes in the upper part of the first partition 13 through a duct and thus communicates with the first air chamber. The second air inlet 12 communicates with the strip-shaped air holes in the lower part of the first partition 13 through a duct and thus communicates with the second air chamber. The second partition 21 is also provided with strip-shaped air holes arranged up and down. The third air inlet 23 communicates with the strip-shaped air holes in the upper part of the second partition 21 through a duct and thus communicates with the third air chamber. The fourth air inlet 24 communicates with the strip-shaped air holes in the lower part of the second partition 21 through a duct and thus communicates with the fourth air chamber. Thus, the first air inlet 11 is communicated with the fourth air inlet 24 through a duct and passing through the heat exchange core 3, and at the same time, the second air inlet 12 is communicated with the third air inlet 23 through a duct and passing through the heat exchange core 3.

[0042] Specifically, as Figure 1 、 2 shown, a rotating shaft 4 is connected between the rotating sides of the first housing 1 and the second housing 2. Specifically, an installation seat for passing through the rotating shaft 4 is provided on the upper side of the second housing 2. The installation seat is specifically tubular and is arranged at the edge of the upper left side of the left end of the second housing 2. The upper side of the first housing 1 is directly connected to the rotating shaft 4. Specifically, it can be welded or a connecting plate that rotates with the rotating shaft 4 is provided on the side of the rotating shaft 4, and the upper side of the first housing 1 is threadedly connected through the connecting plate.

[0043] Two detachable splicing plates are arranged below the installation cavity. The two splicing plates are respectively installed on the lower sides of the first housing 1 and the second housing 2, specifically a part of the lower sides of the first housing 1 and the second housing 2. The two splicing plates form the bottom surface of the installation cavity. After removing the two splicing plates, the heat exchange core can be taken out from the bottom, and then the housing can be folded.

[0044] As Figure 4 shown, when the first housing 1 and the second housing 2 are rotated to the folded state, the first housing 1 is located above and parallel to the second housing 2.

[0045] To achieve automatic folding, as Figure 1 shown, the present invention further includes: a gear installed at the end of the rotating shaft 4, a motor for driving the gear to rotate, a plurality of position sensors for sensing the rotation position, and a controller for controlling the rotation of the motor to switch the position states of the first housing 1 and the second housing 2 according to the state switching instruction. The motor is specifically a stepping motor, which is installed on the outer side of the second housing 2 to provide the power for the rotation of the rotating shaft 4. The details of the specific transmission structure can be fully realized by those skilled in the art and will not be described in detail.

[0046] Preferably, four position sensors can be provided and divided into two groups. One of the first position sensor groups is arranged on the upper side of the first housing 1, and the other is arranged on the upper side edge of the second housing 2. When the first housing 1 and the second housing 2 are rotated to the docking state, the two position sensors are symmetric with respect to the docking surface. When the first housing 1 and the second housing 2 are rotated to the folded state of being parallel up and down, the position sensor on the first housing 1 fits and senses the position sensor on the second housing 2. The two position sensors send out the first induction signal. After receiving the first induction signal, the controller controls the motor to stop rotating the rotating shaft 4, so that the first housing 1 and the second housing 2 stop rotating when they are rotated to just the up and down folded state. The second position sensor group is the position sensors respectively arranged on the two folding plates 5 of the first housing 1 and the second housing 2. When the first housing 1 and the second housing 2 are rotated to the docking state, the two position sensors fit and sense, and send out the second induction signal. After receiving the second induction signal, the controller controls the motor to stop rotating the rotating shaft 4. Make the first housing 1 and the second housing 2 stop rotating when they are rotated to just the docking state.

[0047] Specifically, sealing rubber strips are provided at the docking joints at both ends of the first housing 1 and the second housing 2, that is, the sealing rubber strip is arranged in a circle along the housing edge at the right end of the first housing 1, and the sealing rubber strip is arranged in a circle along the housing edge at the left end of the second housing 2. When the first housing 1 and the second housing 2 are docked, the sealing rubber strips on both sides are squeezed together to seal the installation cavity, avoiding air leakage at the docking joint when switching to the bidirectional flow and affecting the ventilation efficiency.

[0048] The advantages of this fresh air unit lie in its flexibility and efficiency. Through the design of the rotatable housing and heat exchange core, users can adjust the air flow pattern according to their needs to achieve different air treatment effects, thus providing a more comfortable and energy-efficient indoor environment. This has a positive impact on both the improvement of indoor air quality and the reduction of energy consumption.

[0049] Through this innovative design, users can not only select different working modes according to their needs, but also make full use of one unit to achieve the dual functions of rapid air change and heat exchange. This not only improves the flexibility and practicality of the product, but also saves costs for customers, making it more economical and affordable to purchase a fresh air unit.

[0050] This fresh air unit with interchangeable single-pass and double-pass airflows has multiple working modes, and users can select the appropriate mode according to their needs. In the rapid air change mode, the fresh air unit quickly introduces fresh air into the room at a higher wind speed to achieve rapid air renewal. In the heat exchange mode, the fresh air unit realizes the heat transfer between the indoor air and the outdoor air through the heat exchange core, thus maintaining the stability of the indoor temperature and reducing energy consumption.

[0051] The control system can also be intelligently adjusted according to environmental conditions and user needs. For example, when the outdoor temperature is relatively low, the system can automatically switch to the heat exchange mode to reduce energy waste. When the indoor air pollution level is relatively high, the system can switch to the rapid air change mode to accelerate air renewal and purification.

[0052] Through this fresh air unit with interchangeable single-pass and double-pass airflows and its control system, users can flexibly select the appropriate working mode according to different needs and seasons, which can not only rapidly change the air to improve indoor air quality, but also keep the indoor temperature stable and save energy consumption. This provides users with a better user experience and comfort, and also makes contributions to environmental protection and energy conservation.

[0053] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or their combinations.

[0054] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific values should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not required.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0056] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationship of one device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0057] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0058] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fresh air fan, characterized in that, Comprising: A first housing, one end of which is provided with an air outlet, and inside which there is an air duct and a first fan; A second housing, one end of which is provided with an air outlet, and inside which there is an air duct and a second fan; one side edge at the other end of the second housing is rotatably connected to one side edge at the other end of the first housing, so that the first housing and the second housing can be rotated to a state where the two ends are butted or rotated to a folded state; A heat exchange core body, when the first housing and the second housing are rotated to the state where the two ends are butted, the heat exchange core body is installed in the first housing and / or the second housing, and the air outlet of the first housing is communicated with the air duct and the air outlet of the second housing through the heat exchange core body via its air duct; when the first housing and the second housing are rotated to the folded state, the heat exchange core body is disassembled, and the air outlets at one end of the first housing and the second housing are directly communicated with the other end.

2. The fresh air fan according to claim 1, characterized in that, One end of the first housing is provided with a first air outlet and a second air outlet, and one end of the second housing is provided with a third air outlet and a fourth air outlet. When the first housing and the second housing can be rotated to the state where the two ends are butted, the first air outlet is communicated with the fourth air outlet through the air duct and via the heat exchange core body, and the second air outlet is communicated with the third air outlet through the air duct and via the heat exchange core body.

3. The fresh air blower according to claim 1, characterized in that When the first housing and the second housing are rotated to the folded state, the first housing is parallel and located above the second housing.

4. The fresh air blower according to claim 1, characterized in that, When the first housing and the second housing are in the state of butting at both ends, an installation cavity for installing the heat exchange core body is formed.

5. The fresh air unit according to claim 4, wherein At the middle position above the installation cavity, there is a rotating shaft connecting the rotating sides of the first housing and the second housing. Below the installation cavity, there are two detachable splicing plates, and the two splicing plates are respectively installed on the first housing and the second housing. Removing the two splicing plates can take out the heat exchange core body.

6. The fresh air fan according to claim 5, wherein, The rotating side of the second housing is provided with a plurality of mounting seats for passing through the rotating shaft, and the first housing is fixedly connected to the side surface of the rotating shaft.

7. The fresh air blower according to claim 5, characterized in that, Also comprising: A gear installed at the end of the rotating shaft, a motor for driving the gear to rotate, a plurality of position sensors for sensing the rotation position of the first housing and emitting induction signals, and a controller for receiving a state switching instruction and controlling the rotation of the motor to switch the position state of the first housing and the second housing according to the induction signals.

8. The fresh air blower according to claim 7, wherein The plurality of position sensors include a first position sensor group, and the position sensors of the first position sensor group are respectively arranged on the joint surfaces of the first housing and the second housing that are in contact after folding. When the first housing and the second housing are rotated to the folded state where they are parallel up and down, the two position sensors of the first position sensor group are in contact and sense to emit a first induction signal.

9. The fresh air fan according to claim 7, characterized in that, The plurality of position sensors also include a second position sensor group, and the position sensors of the second position sensor group are respectively arranged at the splicing position of the first housing and the second housing. When the first housing and the second housing are rotated to the butting state, the two position sensors of the second position sensor group are in contact and sense to emit a second induction signal.

10. The fresh air blower according to claim 1, characterized in that, Sealing rubber strips are provided at the butting positions of the first housing and the second housing at both ends.

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