Indoor energy-saving ventilation device for building

Abstract

The utility model relates to an indoor energy-saving ventilation device for a building, and relates to the technical field of ventilation engineering technologies, the ventilation device comprises an unpowered air cap, the unpowered air cap comprises an air cap supporting pipe and a plurality of arc-shaped blades, the arc-shaped blades are arranged at one end of the air cap supporting pipe, and the arc-shaped blades are sequentially arranged at intervals in the circumferential direction of the air cap supporting pipe; the air cap supporting pipe is coaxially communicated with the ventilation pipe and is rotationally connected with the ventilation pipe; one end of the ventilation pipe communicates with the interior of the building; the axial flow fan is arranged in the ventilation pipe, and the axial flow fan and the air cap supporting pipe are coaxially arranged; the photovoltaic power generation mechanism comprises a power control assembly and a plurality of photovoltaic films, the photovoltaic films correspond to the arc-shaped blades one to one, and the photovoltaic films are attached to the outer sides of the corresponding arc-shaped blades; and the plurality of photovoltaic films and the axial flow fan are electrically connected with the power control assembly. Indoor ventilation and heat dissipation of the building can be achieved, and meanwhile energy consumed for ventilation and heat dissipation is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ventilation engineering, and in particular to an indoor energy-saving ventilation device for a building. BACKGROUND

[0002] With the acceleration of urbanization and the continuous progress of building technology, roof machine rooms, as an integral part of modern buildings, bear important functions. These machine rooms are usually between 10-40 square meters in area and can be divided into exhaust machine rooms, smoke exhaust machine rooms, exhaust and smoke exhaust machine rooms, positive pressure air supply machine rooms and air conditioning machine rooms according to their functions. These machine rooms play a crucial role in the building, but at the same time, they also face a series of challenges.

[0003] At present, in the existing design of roof machine rooms, ventilation and air exchange mainly rely on louver windows arranged on the four walls. However, this design often fails to meet the heat dissipation requirements of the interior of the machine room under extreme weather conditions, especially in summer high temperature or when the equipment in the machine room is running. When the temperature in the machine room rises to 50℃ or even 60℃, not only will it accelerate the aging of the equipment and wires in the machine room, but also it may cause a fire, causing serious safety hazards. Based on this reason, some existing roof machine rooms may install air conditioning systems to regulate the temperature, but since the temperature inside the roof machine room in summer will be at a high level for a long time, this requires the air conditioning system to run for a long time, which will cause a lot of energy consumption, which is not conducive to energy saving and emission reduction. CONTENT OF THE UTILITY MODEL

[0004] The application provides an indoor energy-saving ventilation device for a building, which aims to realize ventilation and heat dissipation in the interior of the building while reducing the energy consumption required for ventilation and heat dissipation.

[0005] The indoor energy-saving ventilation device for a building provided by the application adopts the following technical scheme:

[0006] An indoor energy-saving ventilation device for a building comprises: a non-powered hat, which comprises a hat support pipe and a plurality of arc-shaped blades, the arc-shaped blades are arranged at one end of the hat support pipe, and a plurality of the arc-shaped blades are arranged in sequence and at intervals along the circumference of the hat support pipe; a ventilation pipe, which is coaxially communicated and rotationally connected with the hat support pipe, and one end of the ventilation pipe is communicated with the interior of the building; an axial flow fan, which is arranged in the ventilation pipe and coaxially arranged with the hat support pipe; a photovoltaic power generation mechanism, which comprises a power control assembly and a plurality of photovoltaic films, a plurality of the photovoltaic films are arranged in one-to-one correspondence with the arc-shaped blades, and the photovoltaic films are attached to the outer side of the corresponding arc-shaped blades; a plurality of the photovoltaic films and the axial flow fan are electrically connected with the power control assembly.

[0007] By adopting the technical scheme, firstly, when there is air thermal convection caused by temperature difference between indoor and outdoor of the building or when there is natural wind outside the building, the non-powered air cap automatically rotates to push the arc-shaped air blade to rotate, under the action of centrifugal force and negative pressure effect, the stale hot air in the building is discharged through the ventilation pipe and the non-powered air cap, so that the ventilation function is realized. Secondly, since the photovoltaic power generation mechanism and the axial flow fan are arranged, the photovoltaic power generation mechanism can supply power for the axial flow fan, and then the axial flow fan rotates to make the air in the ventilation pipe flow actively, so that the indoor air of the building is discharged, and the active ventilation function is realized.

[0008] Based on the cooperation of the non-powered air cap, the photovoltaic power generation mechanism and the axial flow fan, the ventilation and heat dissipation of the building can be realized without additional energy supply. Therefore, the ventilation and heat dissipation of the building can be realized while reducing the energy consumption required for ventilation and heat dissipation.

[0009] Optionally, the non-powered air cap further comprises an air cap upper cover, the air cap upper cover is coaxially and spacedly arranged with the air cap support pipe, and a plurality of arc-shaped blades are arranged between the air cap upper cover and the air cap support pipe, and the two ends of the arc-shaped blades are connected with the air cap upper cover and the air cap support pipe respectively; the side of the air cap upper cover away from the air cap support pipe is also attached with the photovoltaic film.

[0010] By adopting the technical scheme, the air cap upper cover and the air cap support pipe cooperate to realize the installation of a plurality of arc-shaped blades. At the same time, the photovoltaic film is attached to the air cap upper cover, further increasing the area of the sunlight received by the plurality of photovoltaic films, which can increase the power generation of the photovoltaic power generation mechanism to ensure that the power generated by the photovoltaic power generation mechanism is sufficient for the axial flow fan.

[0011] Optionally, a speed detector for detecting the rotating speed of the air cap support pipe is arranged outside the ventilation pipe, and the speed detector is electrically connected with the power control assembly.

[0012] By adopting the technical scheme, the speed detector can detect the rotating speed of the air cap support pipe and transmit the rotating speed information to the power control assembly in real time, which is convenient for judging the wind power outside the building.

[0013] Optionally, the speed detector is a magnetic sensitive sensor.

[0014] By adopting the technical scheme, the magnetic sensitive sensor is used to improve the accuracy and response speed of speed detection.

[0015] Optionally, an electric brake caliper for controlling the rotating speed of the air cap support pipe is arranged outside the ventilation pipe, and the electric brake caliper is electrically connected with the power control assembly.

[0016] By adopting the technical scheme, the electric brake caliper is electrically connected with the electric control assembly, which facilitates control of the rotating speed of the non-powered air cap and facilitates timely braking of the non-powered air cap.

[0017] Optionally, the photovoltaic power generation mechanism further comprises a photovoltaic energy storage battery pack, and the electric control assembly is electrically connected with the photovoltaic energy storage battery pack.

[0018] By adopting the technical scheme, the photovoltaic energy storage battery pack is electrically connected with the electric control assembly, which can store the excess power generated by the photovoltaic thin film power generation, improve the energy utilization rate, and ensure that the axial flow fan can be powered when the light is insufficient.

[0019] Optionally, the flow channel pipe further comprises a main pipe and a first branch pipe, the main pipe and the first branch pipe are located in the indoor room of the building, the main pipe is arranged in a vertical direction, the upper end of the main pipe is communicated with the ventilation pipe, the first branch pipe is arranged in a horizontal direction, one end of the first branch pipe is communicated with the ventilation pipe, and the other end of the first branch pipe is provided with a first stop valve for controlling opening or closing of the first branch pipe.

[0020] By adopting the technical scheme, the flow channel pipe comprises the main pipe and the first branch pipe, so that the flow channel pipe can extend into the indoor room of the building, air in the indoor room of the building can be discharged, and ventilation can be facilitated. The first stop valve can be opened or closed according to needs to control the ventilation path, and the flexibility and efficiency of ventilation are improved.

[0021] Optionally, the flow channel pipe further comprises a second branch pipe, the second branch pipe is also located in the indoor room of the building, the second branch pipe is arranged in a horizontal direction, one end of the second branch pipe is communicated with the ventilation pipe, and the other end of the second branch pipe is provided with a second stop valve for controlling opening or closing of the second branch pipe, and the first branch pipe is located on the upper side of the second branch pipe in a vertical direction.

[0022] By adopting the technical scheme, the second branch pipe and the second stop valve are additionally provided, so that the air inlet of the flow channel pipe has two choices. Since hot air is generally located at the top of the indoor room of the building, and the first branch pipe is located on the upper side of the second branch pipe, the first branch pipe is opened and the second branch pipe is closed at this time, so that the hot air in the indoor room of the building can be quickly discharged, and rapid ventilation and heat dissipation are facilitated. Since air with high humidity is located at the bottom of the indoor room of the building, and the second branch pipe is located on the lower side of the first branch pipe, the second branch pipe is opened and the first branch pipe is closed at this time, so that the humid air in the indoor room of the building can be quickly discharged. Therefore, such a design not only facilitates ventilation and heat dissipation in the indoor room of the building, but also facilitates dehumidification in the indoor room of the building.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The ventilation device of the present application realizes the functions of ventilation, heat dissipation and dehumidification in the building room under the synergistic effect of the unpowered air cap and the photovoltaic power generation mechanism, and can reduce energy consumption and achieve energy saving effect.

[0025] 2. The unpowered air cap can be controlled in real time under the action of the electric brake caliper and the speedometer of the present application, so that the ventilation device of the present application can adjust the rotating speed of the unpowered air cap according to different weather conditions, and thus the ventilation device of the present application can be suitable for different weather.

[0026] 3. The photovoltaic film of the present application is attached to the surface of the arc-shaped fan blade and the air cap cover, and the unpowered air cap can realize self-cleaning when rotating quickly, which can ensure the power generation efficiency of the photovoltaic power generation mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the ventilation device of the present application installed on the building.

[0028] Figure 2 is a schematic diagram of the overall structure of the unpowered air cap, the ventilation pipe and the photovoltaic power generation mechanism of the present application.

[0029] Figure 3 is a schematic diagram of the overall structure of the unpowered air cap, the ventilation pipe and the photovoltaic power generation mechanism of the present application from another perspective.

[0030] Figure 4 is a schematic diagram of the overall structure of the unpowered air cap, the ventilation pipe and the photovoltaic power generation mechanism of the present application from another perspective.

[0031] In the figure, 1, unpowered air cap; 11, support pipe; 12, arc-shaped blade; 13, air cap cover; 2, ventilation pipe; 3, axial flow fan; 4, photovoltaic power generation mechanism; 41, power control assembly; 411, controller; 412, inverter; 42, photovoltaic energy storage battery pack; 5, speedometer; 6, electric brake caliper; 7, flow channel pipe; 71, main pipe; 72, first branch pipe; 73, first stop valve; 74, second branch pipe; 75, second stop valve; 76, connecting pipe; 100, building. DETAILED DESCRIPTION

[0032] The following will be described in detail in combination with the accompanying Figure 1 - the accompanying Figure 4 , the present application will be further described in detail.

[0033] A building indoor energy-saving ventilation device, referring to Figure 1 and Figure 2, including unpowered air cap 1, unpowered air cap 1 including air cap upper cover 13, air cap support tube 11 and several arc-shaped blades 12, air cap support tube 11 is arranged along the vertical direction, air cap upper cover 13 is coaxially arranged with air cap support tube 11, air cap upper cover 13 is arranged on the upper side of air cap support tube 11 along the vertical direction, several arc-shaped blades 12 are arranged between air cap support tube 11 and air cap upper cover 13, and several arc-shaped blades 12 are uniformly arranged along the circumference of air cap support tube 11, the upper end of arc-shaped blade 12 is connected with air cap upper cover 13, and the lower end is connected with air cap support tube 11.

[0034] Due to the structural arrangement of unpowered air cap 1, when wind blows through unpowered air cap 1 or when there is a temperature difference between the inside and outside of unpowered air cap 1, the flowing air will make unpowered air cap 1 rotate, thereby realizing the ventilation function.

[0035] Specifically, the working principle of unpowered air cap 1 is: using natural wind power and air thermal convection caused by the temperature difference between the inside and outside of building 100 to push arc-shaped blades 12, thereby making unpowered air cap 1 rotate, so as to utilize centrifugal force and negative pressure effect to exhaust the stale hot air in the room of building 100. Arc-shaped blades 12 are the best result after scientific calculation, which can strictly ensure that rainwater will not enter under working condition. The exhaust efficiency is high, as long as the wind speed is not less than 0.2 meters or the temperature difference between the inside and outside of the room is more than 0.5℃, unpowered air cap 1 can operate lightly and effectively.

[0036] Referring to Figure 2 , ventilation pipe 2 is arranged along the vertical direction, and the lower end of air cap support tube 11 is sleeved outside the upper end of ventilation pipe 2, and air cap support tube 11 is rotationally connected with ventilation pipe 2 along the circumference of itself. This makes unpowered air cap 1 able to rotate relative to ventilation pipe 2.

[0037] Referring to Figure 2 and Figure 3 , axial flow fan 3 is arranged in ventilation pipe 2, and axial flow fan 3 is coaxially arranged with ventilation pipe 2. The inner wall of ventilation pipe 2 is protruded to form a fixing step, and axial flow fan 3 is installed on the fixing step. When axial flow fan 3 rotates, it can realize active rotation and exhaust of unpowered air cap 1. The setting of the fixing step can provide an installation position for axial flow fan 3, and can support axial flow fan 3, improve the stability of axial flow fan 3 under high-speed rotation, thereby reducing the possibility of deformation of the blades in axial flow fan 3 under high-speed operation, and greatly improving the service life of axial flow fan 3.

[0038] Referring to Figure 2 , photovoltaic power generation mechanism 4 includes several photovoltaic films, and the several photovoltaic films are arranged one by one corresponding to the several arc-shaped blades 12, and the photovoltaic films are attached to the outer side of the corresponding arc-shaped blades 12. In the case of working or not working of unpowered air cap 1, the photovoltaic films can receive light to generate electricity.

[0039] Specifically, the photovoltaic film is flexible, and can be perfectly attached to the arc-shaped fan blade and the upper cover 13 of the wind cap. The photovoltaic film is super-thin, thereby reducing the influence of the photovoltaic film on the rotation of the wind cap 1 during the rotation of the wind cap 1. In addition, the high-speed rotation of the wind cap 1 prevents dust from accumulating on the photovoltaic film, so that the photovoltaic film can be self-cleaned in rainy and windy days, thereby ensuring the power generation efficiency. The photovoltaic film covers the outer side wall of the wind cap 1, so that the photovoltaic power generation mechanism 4 is not limited by the sunlight angle and can generate power as long as there is light.

[0040] With reference to Figure 2 and Figure 3 , the photovoltaic power generation mechanism 4 further comprises a power control assembly 41 and a photovoltaic energy storage battery pack 42, and the photovoltaic energy storage battery pack 42 is arranged around the outer side wall of the ventilation pipe 2. The power control assembly 41 comprises a controller 411 and an inverter 412, and the inverter 412 and the controller 411 are arranged on the outer side wall of the ventilation pipe 2. The inverter 412, the photovoltaic energy storage battery pack 42, the axial flow fan 3 and the plurality of photovoltaic films are electrically connected to the controller 411. The controller 411 can send the power generated by the photovoltaic film to the photovoltaic energy storage battery pack 42 for storage, and the controller 411 can also control the start and stop of the axial flow fan 3. In addition, the wires in the building 100 are also electrically connected to the controller 411, so that when the power generated by the photovoltaic film is insufficient and the storage capacity of the photovoltaic energy storage battery pack 42 is insufficient, the controller 411 can supply power to the axial flow fan 3 through the wires in the building 100.

[0041] With reference to Figure 2 and Figure 4 , a speed detector 5 is arranged on the outer side wall of the ventilation pipe 2. In the embodiment, the speed detector 5 is a magnetic sensitive sensor. The speed detector 5 is located between the outer side wall of the ventilation pipe 2 and the inner side wall of the wind cap support pipe 11, and the sensing end of the speed detector 5 is arranged towards the inner side wall of the wind cap support pipe 11. In addition, the speed detector 5 is electrically connected to the controller 411. The speed detector 5 can monitor the rotation speed of the wind cap 1 in real time.

[0042] With reference to Figure 2 and Figure 4 , an electric brake caliper 6 is further arranged on the outer side wall of the ventilation pipe 2, and the lower end of the wind cap support pipe 11 is inserted into the electric brake caliper 6. In addition, the electric brake caliper 6 is electrically connected to the controller 411. When the speed detector 5 detects that the rotation speed of the wind cap 1 exceeds the set value of the controller 411 or typhoon weather occurs or the exhaust is not needed, the electric brake caliper 6 is started by the controller 411 to reduce the rotation speed of the wind cap 1 or pause the rotation of the wind cap 1.

[0043] With reference to Figure 1 andFigure 2 The unpowered air cap 1, the ventilation pipe 2 and the photovoltaic power generation mechanism 4 are all located outdoors of the building 100. The flow channel pipe 7 comprises a main pipe 71 and a first branch pipe 72, the main pipe 71 and the first branch pipe 72 are both located indoors of the building 100, the main pipe 71 is arranged in a vertical direction and the upper end of the main pipe 71 is communicated with the ventilation pipe 2, the first branch pipe 72 is arranged in a horizontal direction, one end of the first branch pipe 72 is communicated with the side wall of the main pipe 71, the other end of the first branch pipe 72 is provided with a first stop valve 73, and the first branch pipe 72 is arranged on the top wall indoors of the building 100. Since hot air is generally located at the top indoors of the building 100, the first branch pipe 72 is arranged on the top wall indoors of the building 100, so that when the first stop valve 73 is opened, hot air can be quickly discharged.

[0044] With reference to Figure 1 and Figure 2 , the flow channel pipe 7 further comprises a second branch pipe 74, the second branch pipe 74 is arranged in a horizontal direction, one end of the second branch pipe 74 is communicated with the side wall of the main pipe 71, the other end of the second branch pipe 74 is provided with a second stop valve 75, and the second branch pipe 74 is arranged on the bottom wall indoors of the building 100. Since air with high humidity is located at the bottom indoors of the building 100, the second branch pipe 74 is arranged on the bottom wall of the building 100, so that when the second stop valve 75 is opened, rapid dehumidification can be achieved.

[0045] With reference to Figure 1 and Figure 2 , the first stop valve 73 and the second stop valve 75 are both electrically connected with the controller 411, so that the first branch pipe 72 and the second branch pipe 74 can be automatically opened and closed.

[0046] With reference to Figure 1 and Figure 2 , when the unpowered air cap 1 is arranged on the side wall of the building 100, the flow channel pipe 7 further comprises a connecting pipe 76, one end of the connecting pipe 76 is connected with the lower end of the ventilation pipe 2, the other end of the connecting pipe 76 extends into the building 100 and is connected with the upper end of the main pipe 71, so that the connecting pipe 76 realizes the communication between the ventilation pipe 2 and the main pipe 71. When the space at the top of the building 100 is insufficient, the ventilation device can also be installed on the side wall of the building 100 due to the arrangement of the connecting pipe 76.

[0047] The implementation principle of the embodiment of the present application is that when there is wind outdoors of the building 100 or the temperature indoors of the building 100 exceeds the temperature outdoors of the building 100, the unpowered air cap 1 rotates, and then the hot air indoors of the building 100 is discharged through the ventilation pipe 2 and the flow channel pipe 7, and the cold air outdoors of the building 100 enters the building 100 through the window or the door, so that the ventilation effect can be achieved. Moreover, the greater the temperature difference between the inside and outside of the building 100, the better the ventilation effect; the greater the wind speed outdoors of the building 100, the better the ventilation effect.

[0048] In addition, the ventilation device has both ventilation and dehumidification functions. Specifically, in the plum rain season, the first stop valve 73 is closed and the second stop valve 75 is opened, so that the cold and humid air deposited on the bottom of the room 100 is discharged from the second branch pipe 74, thereby achieving passive dehumidification. Conversely, in high temperature weather, the second stop valve 75 is closed and the first stop valve 73 is opened, so that the hot air floating on the top of the room 100 is discharged from the first branch pipe 72, thereby achieving passive ventilation.

[0049] In addition, the ventilation device can also achieve active ventilation or dehumidification. Specifically, when the weather is fine, the photovoltaic power generation mechanism 4 drives the axial flow fan 3 to exhaust, thereby achieving the active exhaust function of the ventilation device. During the rotation of the passive wind cap 1, when the tachometer 5 detects that the rotation speed of the passive wind cap 1 exceeds the value set by the controller 411, or a typhoon occurs or exhaust is not needed, the controller 411 starts the electric brake caliper 6, thereby reducing the rotation speed of the passive wind cap 1 or stopping the rotation of the passive wind cap 1.

[0050] During the operation of the photovoltaic power generation mechanism 4, in sunny weather or other strong sunlight weather, the excess power generated by the photovoltaic film is stored in the photovoltaic energy storage battery pack 42 for powering the tachometer 5, so that the tachometer 5 can detect the rotation speed of the passive wind cap 1 in real time. When the rotation speed of the passive wind cap 1 is lower than the value set by the controller 411, the stored power in the photovoltaic energy storage battery pack 42 is used to power and drive the axial flow fan 3 to rotate and exhaust; when the rotation speed of the passive wind cap 1 is higher than the value set by the controller 411, the power generated by the photovoltaic film is all stored; when the photovoltaic energy storage battery pack 42 is insufficient to support the rotation of the axial flow fan 3 or the rotation speed of the axial flow fan 3 is too low, the power line in the room 100 of the building 100 can also be used to drive the axial flow fan 3 to rotate and enhance the exhaust.

[0051] The embodiments of the specific embodiment are the preferred embodiments of the present application, but do not limit the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A building indoor energy saving ventilation device, characterized in that, The utility model provides a kind of no-power wind cap (1), including wind cap support pipe (11) and several arc blades (12), the arc blade (12) is arranged in one end of the wind cap support pipe (11), several the arc blade (12) is sequentially spaced along the circumference of the wind cap support pipe (11);Ventilation pipe (2), the wind cap support pipe (11) is coaxial with the ventilation pipe (2) and rotationally connected;And the ventilation pipe (2) one end is communicated with building (100) indoor; Axial fan (3), the axial fan (3) is arranged in the ventilation pipe (2), the axial fan (3) is coaxially arranged with the wind cap support pipe (11); Photovoltaic power generation mechanism (4), including power control component (41) and several photovoltaic films, several the photovoltaic film is correspondingly arranged with the arc blade (12), and the photovoltaic film is attached outside corresponding the arc blade (12);Several the photovoltaic film and the axial fan (3) are electrically connected with the power control component (41); Flow channel pipe (7), the flow channel pipe (7) includes main pipe (71), and the main pipe (71) is located in building (100) indoor, and the main pipe (71) is arranged along vertical direction; The no-power wind cap (1) is located on the side wall of building (100), and the flow channel pipe (7) further includes adapter pipe (76), one end of the adapter pipe (76) is connected with the lower end of the ventilation pipe (2), and the other end of the adapter pipe (76) extends into the building (100) indoor and is connected with the upper end of the main pipe (71). The no-power wind cap (1) further includes wind cap upper cover (13), the wind cap upper cover (13) is coaxially spaced with the wind cap support pipe (11), and several the arc blade (12) is arranged between the wind cap upper cover (13) and the wind cap support pipe (11), and the arc blade (12) both ends are connected with the wind cap upper cover (13) and the wind cap support pipe (11) respectively; The side of the wind cap upper cover (13) away from the wind cap support pipe (11) is also attached with the photovoltaic film.

2. A building indoor energy saving ventilation device according to claim 1, characterized in that, The outside of the ventilation pipe (2) is provided with a speedometer (5) for detecting the rotating speed of the wind cap support pipe (11), and the speedometer (5) is electrically connected with the power control component (41). The speedometer (5) adopts a magnetic sensitive sensor.

3. The energy saving ventilation device for building indoor according to claim 1, characterized in that, The outside of the ventilation pipe (2) is provided with an electric brake caliper (6) for controlling the rotating speed of the wind cap support pipe (11), and the electric brake caliper (6) is electrically connected with the power control component (41).

4. A building indoor energy saving ventilation device according to claim 3, characterized in that, The photovoltaic power generation mechanism (4) further includes a photovoltaic energy storage battery pack (42), and the power control component (41) is electrically connected with the photovoltaic energy storage battery pack (42).

5. The energy-saving ventilation device for indoor of building according to claim 1 or 3, characterized in that, The flow channel pipe (7) further includes a first branch pipe (72), and the first branch pipe (72) is located in the building (100) indoor; 6. The energy efficient ventilation device for a building according to claim 1, wherein, ​ 7. The energy efficient ventilation device for a building according to claim 1, wherein ​ The first branch pipe (72) is arranged horizontally, and one end of the first branch pipe (72) is communicated with the ventilation pipe (2), and the other end is provided with a first stop valve (73) for controlling opening or closing of the first branch pipe (72).

8. A building indoor energy saving ventilation device according to claim 7, characterized in that, The flow channel pipe (7) further comprises a second branch pipe (74), and the second branch pipe (74) is also located indoors of the building (100); The second branch pipe (74) is arranged horizontally, and one end of the second branch pipe (74) is communicated with the ventilation pipe (2), and the other end is provided with a second stop valve (75) for controlling opening or closing of the second branch pipe (74); And the first branch pipe (72) is located on the upper side of the second branch pipe (74) in the vertical direction.

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