A multi-fan coordinated fresh air conditioning system

Abstract

This utility model discloses a multi-fan coordinated fresh air conditioning system, including an outdoor unit and an indoor unit. The outdoor unit is equipped with a pressurized air duct, and a first fan and a second fan are respectively installed inside the outdoor unit. By installing the first fan and the second fan in the indoor unit and connecting the first fan and the second fan in series, the fresh air static pressure output by the second fan is greatly improved. According to the test results of the fresh air conditioning system, the duct resistance of the fresh air conditioning system is the main reason for limiting the increase of fresh air volume. The high fan static pressure can overcome the duct resistance of the fresh air conditioning system and deliver fresh air to the room. With the help of the third fan installed in the indoor unit, a larger fresh air volume is delivered to the room.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a multi-fan coordinated fresh air conditioning system. Background Technology

[0002] Most existing household fresh air conditioners use a single indoor unit fan structure (the indoor unit has a separate fan to introduce outdoor fresh air), which has the following shortcomings in user experience:

[0003] 1. Insufficient airflow: Most household fresh air conditioners on the market currently have a fresh air volume of 30-40 m³ / h. Based on the fresh air requirement of 30 m³ / h per person, current household fresh air conditioners are unlikely to meet the fresh air volume needs of multiple people in a scenario. 2. High noise: The average noise level of the highest setting of current household fresh air conditioners on the market is 40 dBa, which is higher than the normal noise level of household air conditioners. The noise is even more noticeable when the air conditioner is in sleep mode, silent mode, or at a low fan speed. 3. Poor flexibility: It is impossible to dynamically adjust the fan speed and fresh air volume according to the actual situation. Publication number CN112050344A discloses an air conditioning fresh air system, comprising: an air conditioning fan, a fresh air outlet duct, a return air inlet duct, and a fresh air fan and a return air fan arranged face-to-face; a total heat exchanger disposed between the fresh air fan and the return air fan; a return air outlet duct, one end connected to the return air fan, and the other end connected to the outside via a duct, wherein the return air inlet duct, the total heat exchanger, the return air fan, and the return air outlet duct are sequentially connected to form a return air channel; and a fresh air inlet duct, one end connected to the total heat exchanger, and the other end connected to the outside via a duct, wherein the fresh air inlet duct, the total heat exchanger, the fresh air fan, and the fresh air outlet duct are sequentially connected to form a fresh air channel. This system uses only a single fan, resulting in insufficient airflow and high noise levels. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a low-noise multi-fan coordinated fresh air conditioning system.

[0005] To achieve the above objectives, the present invention provides a solution as follows: a multi-fan coordinated fresh air conditioning system, comprising an outdoor unit and an indoor unit. The outdoor unit is equipped with a pressurized air duct, and a first fan and a second fan are respectively installed inside the outdoor unit. The first fan has a first air inlet and a first air outlet, and the second fan has a second air inlet and a second air outlet. The first air inlet is connected to the external environment, and the first air outlet is connected to the pressurized air duct, which is connected to the second air inlet. The indoor unit is equipped with a third fan, which has a third air inlet and a third air outlet. The second air outlet is connected to a fresh air duct, which is connected to the third air inlet, and the third air outlet is connected to the indoor environment.

[0006] The beneficial effects of this utility model are: lower noise, larger air volume, and greatly improved user experience. Based on the basic principle of ventilation fans, when fans are connected in series, the air volume remains constant while the static pressure increases. This fresh air conditioning system, by installing a first fan and a second fan in the indoor unit and connecting them in series, significantly increases the static pressure of the fresh air output by the second fan. According to the test results of the fresh air conditioning system, the duct resistance is the main reason limiting the increase in fresh air volume, while high fan static pressure can overcome the duct resistance and deliver fresh air indoors. This, combined with the third fan installed in the indoor unit... The fan enables a larger volume of fresh air to be delivered indoors. Meanwhile, the outdoor unit of this fresh air conditioning system already provides a certain volume of fresh air when the first and second fans are turned on. Therefore, even without the third fan on the indoor unit, the indoor unit still outputs 30 m³ / h of fresh air. The noise level mainly depends on the noise of the indoor unit. Therefore, with the same airflow, the fan speed of the indoor unit of this fresh air conditioning system is lower than that of a traditional fresh air conditioner, and the measured noise level of 60 m³ / h is about 6 dB lower than that of a traditional fresh air conditioner.

[0007] Furthermore, an air inlet is provided on the outside of the outdoor unit, the first air inlet is located on the front of the first fan, the air inlet is connected to the first air inlet, and the first air outlet is located on the side of the first fan.

[0008] Furthermore, a grille is provided at the air inlet.

[0009] Furthermore, the pressurized air duct gradually narrows along the air supply direction. By adopting the above structure, this invention achieves increased air pressure.

[0010] Furthermore, the second air inlet is located on the front of the second fan, and the second air outlet is located on the side of the second fan, gradually narrowing along the airflow direction. By adopting the above structure, this invention increases the air pressure.

[0011] Furthermore, the third air inlet is located on the back of the third fan, and the third air outlet is located on the top of the third fan.

[0012] Furthermore, the third fan includes a third housing, a third motor, and a forward centrifugal impeller. The third air inlet is located on the back of the third housing, and the third air outlet is located on the top of the third housing. The third motor and the forward centrifugal impeller are respectively disposed inside the third housing, and the third motor is connected to the forward centrifugal impeller.

[0013] Furthermore, a filter screen is provided inside the third housing, and the filter screen is located between the third air inlet and the forward centrifugal impeller. With the above structure, this invention has a filtration function.

[0014] Furthermore, the indoor unit is equipped with a panel, on which a carbon dioxide sensor is installed, and an LED indicator light is installed on the carbon dioxide sensor. Attached Figure Description

[0015] Figure 1 For the overall structural connection of this utility model Figure 1 .

[0016] Figure 2 For the overall structural connection of this utility model Figure 2 .

[0017] Figure 3 This is a three-dimensional view of the outdoor unit of this utility model.

[0018] Figure 4 This is a structural diagram of the outdoor unit of this utility model.

[0019] Figure 5 The third fan of this utility model is three-dimensional. Figure 1 .

[0020] Figure 6 The third fan of this utility model is three-dimensional. Figure 2 .

[0021] Figure 7 This is a diagram of the internal structure of the third fan of this utility model.

[0022] Figure 8 This is a structural diagram of the carbon dioxide sensor of this utility model.

[0023] Figure 9 This is a schematic diagram of the various modes of the air conditioner of this utility model.

[0024] Among them, 1 is the outdoor unit, 11 is the first fan, 111 is the first air inlet, 112 is the first air outlet, 12 is the second fan, 121 is the second air inlet, 122 is the second air outlet, 13 is the pressurized air duct, 14 is the air inlet, 141 is the grille, 2 is the third fan, 21 is the third housing, 211 is the third air inlet, 212 is the third air outlet, 213 is the third motor, 214 is the forward centrifugal impeller, 22 is the filter screen, 23 is the carbon dioxide sensor, 231 is the LED indicator light, and 3 is the fresh air duct. Detailed Implementation

[0025] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] See appendix Figure 1 To be continued Figure 9 As shown, a multi-fan coordinated fresh air conditioning system includes an outdoor unit 1 and an indoor unit. The outdoor unit 1 is equipped with a pressurized air duct 13. A first fan 11 and a second fan 12 are respectively installed inside the outdoor unit 1. The first fan 11 has a first air inlet 111 and a first air outlet 112. The second fan 12 has a second air inlet 121 and a second air outlet 122. The first air inlet 111 is connected to the external environment. The first air outlet 112 is connected to the pressurized air duct 13, and the pressurized air duct 13 is connected to the second air inlet 121. A third fan 2 is installed inside the indoor unit. The third fan 2 has a third air inlet 211 and a third air outlet 212. The second air outlet 122 is connected to a fresh air duct 3, which is connected to the third air inlet 211. The third air outlet 212 is connected to the indoor environment.

[0028] In this embodiment, an air inlet 14 is opened on the outside of the outdoor unit 1, a first air inlet 111 is opened on the front of the first fan 11, the air inlet 14 is connected to the first air inlet 111, and a first air outlet 112 is opened on the side of the first fan 11; a grille 141 is provided at the air inlet 14; the pressurized air duct 13 gradually narrows along the air supply direction.

[0029] In this embodiment, the second air inlet 121 is located on the front of the second fan 12, and the second air outlet 122 is located on the side of the second fan 12, with the second air outlet 122 gradually narrowing along the air delivery direction.

[0030] In this embodiment, the third air inlet 211 is located on the back of the third fan 2, and the third air outlet 212 is located on the top of the third fan 2. The third fan 2 includes a third housing 21, a third motor 213, and a forward centrifugal impeller 214. The third air inlet 211 is located on the back of the third housing 21, and the third air outlet 212 is located on the top of the third housing 21. The third motor 213 and the forward centrifugal impeller 214 are respectively disposed inside the third housing 21, and the third motor 213 is connected to the forward centrifugal impeller 214. A filter screen 22 is disposed inside the third housing 21, and the filter screen 22 is located between the third air inlet 211 and the forward centrifugal impeller 214.

[0031] In this embodiment, the indoor unit is provided with a panel, on which a carbon dioxide sensor 23 is installed, and an LED indicator light 231 is provided on the carbon dioxide sensor 23.

[0032] In this embodiment, the first fan 11 and the second fan 12 are connected in series through the pressurized air duct 13. In use, outdoor fresh air enters the first air inlet 111 of the first fan 11 through the air inlet 14, and then is output to the pressurized air duct 13 through the first air outlet 112 by the first fan 11. The gradually narrowing structure of the pressurized air duct 13 increases the air pressure of the fresh air, and then enters the second fan 12 through the second air inlet 121, and is output to the fresh air channel 3 through the second air outlet 122. Finally, it enters the third motor 2 through the fresh air channel 3 and the third air inlet 211. The third motor 213 is started, and the third motor 213 drives the forward centrifugal impeller 214 to rotate, so as to draw fresh air into the third housing 21. After being filtered by the filter screen 22, it is output to the room through the third air outlet 212.

[0033] In this embodiment, the air conditioner has four modes: "low speed", "medium speed", "high speed" and "smart".

[0034] Mode 1 (Low fan speed fresh air):

[0035] When the fresh air mode is at a low speed, or when the fresh air mode is on but the air conditioner is in silent or sleep mode, the third fan 2 will start at a low speed, and the first and second fans will also start at a low speed. At this time, the indoor fresh air noise is about 30dB, the outdoor fresh air noise is about 45dB, and the air volume is about 40m^3 / h.

[0036] Mode 2 (Medium-level fresh air):

[0037] When the fresh air mode is at the medium speed setting, the third fan 2 is started at low speed, and the first fan 11 and the second fan 12 are started at high speed. At this time, the indoor fresh air noise is about 33dB, the outdoor fresh air noise is about 50dB, and the air volume is about 60m^3 / h.

[0038] Mode 3 (Strong Wind Setting with Fresh Air):

[0039] When the fresh air mode is at the high speed, the third fan 2 is started at high speed, and the first fan 11 and the second fan 12 are started at high speed. At this time, the indoor fresh air noise is about 37dB, the outdoor fresh air noise is 50dB, and the air volume is about 80m^3 / h.

[0040] Mode 4 (Intelligent Fresh Air System):

[0041] When the fresh air mode is in the smart setting, the first fan 11 and the second fan 12 start at low speed, and the third fan 2 starts at low speed.

[0042] At this time, the measurement value of the indoor carbon dioxide sensor 23 is read. The indoor CO2 concentration is pre-set to three levels. When the indoor CO2 concentration is 400~600ppm, the LED bead at the corresponding position of the CO2 sensor on the panel lights up green, and each fan operates at low fresh air speed. When the indoor CO2 concentration is 600~1000ppm, the LED indicator 231 at the corresponding position of the carbon dioxide sensor 23 on the panel lights up yellow, and each fan operates at medium fresh air speed. When the indoor CO2 concentration is above 1000ppm, the LED indicator 231 at the corresponding position of the carbon dioxide sensor 23 on the panel lights up red, and each fan operates at high fresh air speed. Thereafter, the indoor CO2 concentration is read every 15 minutes. When the indoor CO2 concentration changes to other levels, the operating status of each fan is switched.

[0043] Each fan operates at a speed controlled by PWM pulse width modulation. The third motor 213 of the third fan 2 is connected to the main board of the indoor unit of the air conditioner with four wires. The motors of the first fan 11 and the second fan 12 are connected to the main board of the outdoor unit of the air conditioner with four wires.

[0044] The four-wire interfaces for each motor are PWM, FG, GND, and VCC.

[0045] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any person skilled in the art can make more possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from the content of the technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A multi-fan coordinated fresh air conditioning system, comprising an outdoor unit (1) and an indoor unit, characterized in that: The outdoor unit (1) is equipped with a pressurized air duct (13). The outdoor unit (1) is equipped with a first fan (11) and a second fan (12). The first fan (11) has a first air inlet (111) and a first air outlet (112). The second fan (12) has a second air inlet (121) and a second air outlet (122). The first air inlet (111) is connected to the external environment. The first air outlet (112) is connected to the pressurized air duct (13). The pressurized air duct (13) is connected to the second air inlet (121). The indoor unit is equipped with a third fan (2). The third fan (2) has a third air inlet (211) and a third air outlet (212). The second air outlet (122) is connected to a fresh air duct (3). The fresh air duct (3) is connected to the third air inlet (211). The third air outlet (212) is connected to the indoor environment.

2. The multi-fan coordinated fresh air conditioning system of claim 1, wherein: The outdoor unit (1) has an air inlet (14) on its outer side. The first air inlet (111) is located on the front of the first fan (11). The air inlet (14) is connected to the first air inlet (111). The first air outlet (112) is located on the side of the first fan (11).

3. The multi-fan coordinated fresh air conditioning system of claim 2, wherein: A grille (141) is provided at the air inlet (14).

4. The multi-fan coordinated fresh air conditioning system of claim 1, wherein: The pressurized air duct (13) gradually narrows along the air supply direction.

5. The multi-fan coordinated fresh air conditioning system of claim 1, wherein: The second air inlet (121) is located on the front of the second fan (12), and the second air outlet (122) is located on the side of the second fan (12). The second air outlet (122) gradually narrows along the air supply direction.

6. The multi-fan coordinated fresh air conditioning system of claim 1, wherein: The third air inlet (211) is located on the back of the third fan (2), and the third air outlet (212) is located on the top of the third fan (2).

7. The multi-fan coordinated fresh air conditioning system of claim 6, wherein: The third fan (2) includes a third housing (21), a third motor (213), and a forward centrifugal impeller (214). The third air inlet (211) is located on the back of the third housing (21), and the third air outlet (212) is located on the top of the third housing (21). The third motor (213) and the forward centrifugal impeller (214) are respectively located inside the third housing (21), and the third motor (213) is connected to the forward centrifugal impeller (214).

8. The multi-fan coordinated fresh air conditioning system of claim 7, wherein: A filter screen (22) is provided inside the third housing (21), and the filter screen (22) is located between the third air inlet (211) and the forward centrifugal impeller (214).

9. The multi-fan coordinated fresh air conditioning system of claim 1, wherein: The indoor unit is equipped with a panel, on which a carbon dioxide sensor (23) is installed, and an LED indicator light (231) is installed on the carbon dioxide sensor (23).

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