Fresh air handling unit

Abstract

The utility model relates to a fresh air handling unit, and relates to the technical field of fresh air handling units. The fresh air handling unit comprises a first air supply cavity, a second air supply cavity and a heat exchange channel with a heat exchanger, the first air supply cavity is communicated with the second air supply cavity through the heat exchange channel, and the first air supply cavity is provided with a first air supply outlet capable of being opened or closed. The second air supply cavity is provided with a second air supply outlet capable of being opened or closed. In the first fresh air mode, the first air supply outlet is controlled to be opened, the second air supply outlet is controlled to be closed, and the heat exchanger is closed, so that fresh air is sent out from the first air supply outlet; and in the second fresh air mode, the first air supply outlet is controlled to be closed, the second air supply outlet is controlled to be opened, and the heat exchanger is opened, so that fresh air is sent out from the second air supply outlet after sequentially passing through the first air supply cavity, the heat exchange channel and the second air supply cavity. The power consumption of the air feeder can be reduced when heat exchange is not needed, and the energy-saving effect of the fresh air handling unit is improved.

Description

Technical Field

[0001] This utility model relates to the field of fresh air handling unit technology, and in particular to a fresh air handling unit. Background Technology

[0002] To ensure air circulation within hospitals and prevent cross-infection, fresh air units are installed to introduce fresh air from outside, improving air quality. However, outdoor air temperatures fluctuate significantly; in winter, the temperature of the fresh air is too low, while in summer it is too high. Directly introducing fresh air into the hospital can cause discomfort to patients and medical staff.

[0003] In related technologies, heat exchangers are installed in fresh air handling units to heat or cool the fresh air introduced into the hospital, ensuring a suitable temperature. However, installing heat exchangers in ventilation ducts increases air resistance within the ducts, increasing the load on the fresh air handling unit even without the heat exchanger being activated, resulting in higher power consumption and insufficient energy efficiency. Utility Model Content

[0004] This utility model provides a fresh air handling unit for reducing power consumption and improving energy-saving performance.

[0005] In a first aspect, this utility model provides a fresh air handling unit, which includes: a first air supply chamber, a second air supply chamber, and a heat exchange channel with a heat exchanger. The first air supply chamber and the second air supply chamber are connected through the heat exchange channel. The first air supply chamber is provided with a first air outlet that can be opened or closed, and the second air supply chamber is provided with a second air outlet that can be opened or closed. In a first fresh air mode, the first air outlet is controlled to open, the second air outlet is controlled to close, and the heat exchanger is closed, so that fresh air is delivered from the first air outlet. In a second fresh air mode, the first air outlet is controlled to close, the second air outlet is controlled to open, and the heat exchanger is opened, so that fresh air passes through the first air supply chamber, the heat exchange channel, and the second air supply chamber in sequence and is delivered from the second air outlet.

[0006] In one embodiment, a first air supply valve is provided at the first air supply outlet, which is used to close or open the first air supply outlet; a second air supply valve is provided at the second air supply outlet, which is used to close or open the second air supply outlet; the fresh air unit includes a controller, which is electrically connected to the first air supply valve and the second air supply valve respectively.

[0007] In one embodiment, the first air supply chamber is provided with a fresh air inlet; the fresh air unit also includes a return air chamber and a mixing air channel. The return air chamber has a return air inlet, and the mixing air channel connects the return air chamber to the first air supply chamber, and a mixing ventilation valve is provided at the mixing air channel. In the normal return air mode, the return air inlet is open, the mixing air channel is open, and the fresh air inlet is closed, so that return air enters from the first air supply chamber and can be sent out from the first air supply outlet or the second air supply outlet. In the normal mixing air mode, the return air inlet is open, the mixing air channel is open, and the fresh air inlet is open, so that mixed air enters from the first air supply chamber and can be sent out from the first air supply outlet or the second air supply outlet.

[0008] In one embodiment, the return air chamber is also provided with an exhaust port, and an exhaust valve is provided between the exhaust port and the return air inlet; an exhaust fan is installed in the return air chamber, and in exhaust mode, the exhaust port is opened, and the return air chamber is ventilated.

[0009] In one embodiment, the exhaust vent and the return air inlet are respectively located on opposite sides of the return air chamber, and the side of the return air chamber with the return air inlet is connected to the mixing air channel.

[0010] In one embodiment, the direction of the maximum size of the first air supply cavity is the first direction; the second air supply cavity and the return air cavity are located on the same side of the first air supply cavity in the second direction, wherein the second direction is perpendicular to the first direction.

[0011] In one embodiment, the first air supply cavity is connected to the heat exchange channel and the mixing channel on opposite sides along the first direction, respectively; one side of the return air cavity is connected to the mixing channel, and the other side of the return air cavity extends toward the second air supply cavity.

[0012] In one embodiment, a first filter is provided in both the first air supply chamber and the return air chamber.

[0013] In one embodiment, the fresh air unit further includes a first ventilation channel connected to a first air supply chamber, a second ventilation channel connected to a second air supply chamber, and a filter chamber. The filter chamber is connected to the first ventilation channel and the second ventilation channel respectively. The filter chamber has a third air outlet and a second filter is installed in the filter chamber. In emergency ventilation mode, the first air outlet and the second air outlet are closed, and the first ventilation channel or the second ventilation channel is opened, so that airflow enters the filter chamber from the first ventilation channel or the second ventilation channel and is then sent out from the third air outlet of the filter chamber.

[0014] In one embodiment, the fresh air unit further includes a housing, in which a first partition, a second partition, and a third partition are disposed. The first partition and the third partition are parallel, and both the first partition and the third partition are perpendicular to the second partition. One end of the second partition is connected to the middle region of the first partition, and the middle region of the second partition is connected to the third partition. The inner wall of the housing, together with the first partition, the second partition, and the third partition, defines a first air supply cavity, a second air supply cavity, a return air cavity, and a filter cavity. The filter cavity is located on the side of the first partition away from the second partition, the second air supply cavity is located between the first partition and the third partition, the return air cavity is located on the side of the third partition away from the first partition, and the first air supply cavity is located on the side of the second partition away from the third partition.

[0015] In one embodiment, the first ventilation channel and the second ventilation channel are both formed in the first partition, the heat exchange channel is formed on the side of the second partition close to the first partition, and the mixing channel is formed on the side of the second partition away from the first partition.

[0016] Secondly, this utility model also provides a control method for a fresh air handling unit, comprising the following steps: In a first fresh air mode, the first air outlet on the first air supply chamber of the fresh air handling unit is opened, the second air outlet on the second air supply chamber of the fresh air handling unit is closed, and the heat exchanger in the heat exchange channel of the fresh air handling unit is closed, so that fresh air is delivered from the first air outlet; In a second fresh air mode, the first air outlet on the first air supply chamber of the fresh air handling unit is closed, the second air outlet on the second air supply chamber of the fresh air handling unit is opened, and the heat exchanger in the heat exchange channel of the fresh air handling unit is opened, so that fresh air passes through the first air supply chamber, the heat exchange channel and the second air supply chamber in sequence and is delivered from the second air outlet.

[0017] In one embodiment, in the normal return air mode, the fresh air inlet in the first air supply chamber is closed, and the mixing channel connecting the first air supply chamber and the return air chamber is opened, so that return air enters from the first air supply chamber and can be sent out from the first air supply outlet or the second air supply outlet; in the normal mixing air mode, the fresh air inlet in the first air supply chamber is opened, and the mixing channel connecting the first air supply chamber and the return air chamber is opened, so that mixed air enters from the first air supply chamber and can be sent out from the first air supply outlet or the second air supply outlet.

[0018] In one embodiment, the fresh air handling unit further includes a first ventilation channel connecting the first air supply chamber and the filter chamber, and a second ventilation channel connecting the second air supply chamber and the filter chamber. The control method further includes the following steps: in emergency ventilation mode, the first air supply port and the second air supply port of the fresh air handling unit are closed, and the first ventilation channel or the second ventilation channel is opened, so that the airflow enters the filter chamber from the first ventilation channel or the second ventilation channel, and then exits from the third air supply port of the filter chamber.

[0019] Thirdly, this utility model also provides a storage medium storing a computer program thereon, characterized in that: when the computer program is executed by a processor, it implements the control method of the second aspect.

[0020] Compared with existing technologies, the advantages of this invention are that when heat exchange of fresh air is not required, the controller can open the first air outlet and close the second air outlet, allowing the incoming fresh air to flow directly into the room from the first air outlet of the first air supply chamber. This avoids the fresh air passing through the heat exchanger, reducing wind resistance and thus reducing power consumption. When it is necessary to adjust the temperature of the incoming fresh air, the first air outlet can be closed while the second air outlet and heat exchanger are opened. This prevents the fresh air from flowing directly out of the first air outlet; instead, it must pass through the heat exchange channel, be heated by the heat exchanger, and then flow out from the second air outlet, thus achieving temperature regulation. This reduces the power consumption of the air supply fan when heat exchange of fresh air is not required, improving the energy efficiency of the fresh air handling unit. Attached Figure Description

[0021] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the internal structure of the fresh air handling unit in the embodiment of this utility model from the main view direction;

[0023] Figure 2 This is a schematic diagram of the internal structure of the fresh air handling unit in an embodiment of this utility model, viewed from the right.

[0024] Figure 3 This is a schematic diagram of the internal structure of the fresh air handling unit in the isometric direction in an embodiment of this utility model;

[0025] Figure 4 This is an airflow direction diagram of the fresh air unit in the first fresh air mode in an embodiment of this utility model;

[0026] Figure 5 This is an airflow direction diagram of the fresh air unit in the second fresh air mode in an embodiment of this utility model;

[0027] Figure 6 This is an airflow direction diagram of the fresh air unit in the third fresh air mode in an embodiment of this utility model;

[0028] Figure 7 This is an airflow direction diagram of the fresh air unit in the fourth fresh air mode in an embodiment of this utility model;

[0029] Figure 8 This is an airflow direction diagram of the fresh air unit in the first return air mode in an embodiment of this utility model;

[0030] Figure 9 This is an airflow direction diagram of the fresh air unit in the second return air mode in an embodiment of this utility model;

[0031] Figure 10 This is an airflow direction diagram of the fresh air unit in the third return air mode in an embodiment of this utility model;

[0032] Figure 11 This is an airflow direction diagram of the fresh air handling unit in the fourth return air mode in an embodiment of this utility model;

[0033] Figure 12 This is an airflow direction diagram of the fresh air unit in the first mixed air mode in an embodiment of this utility model;

[0034] Figure 13 This is an airflow direction diagram of the fresh air unit in the second mixed air mode in an embodiment of this utility model;

[0035] Figure 14 This is an airflow direction diagram of the fresh air unit in the third mixed air mode in an embodiment of this utility model;

[0036] Figure 15 This is an airflow direction diagram of the fresh air handling unit in the fourth mixed air mode in an embodiment of this utility model.

[0037] Figure label:

[0038] 1. Shell; 11. First partition; 12. Second partition; 13. Third partition;

[0039] 2. First air supply chamber; 21. First air supply valve; 22. First air supply outlet; 23. Fresh air inlet; 24. Fresh air valve; 25. Air supply fan;

[0040] 3. Second air supply chamber; 31. Second air supply valve; 32. Second air supply outlet;

[0041] 4. Heat exchange passage; 41. Heat exchanger;

[0042] 5. Return air chamber; 51. Return air inlet; 52. Exhaust fan; 53. Exhaust outlet; 54. Exhaust valve;

[0043] 6. Mixing air duct; 61. Mixing ventilation valve;

[0044] 7. Filter chamber; 71. Second filter;

[0045] 81. First ventilation channel; 811. First ventilation valve; 82. Second ventilation channel; 821. Second ventilation valve;

[0046] 9. First filter. Detailed Implementation

[0047] The present invention will be further described below with reference to the accompanying drawings.

[0048] To regulate the temperature of the indoor air introduced by the fresh air handling unit, a heat exchanger is usually installed in the ventilation duct of the unit. When the heat exchanger is activated, the air passing through it exchanges heat with the heat exchanger, thereby regulating the air temperature. However, because a heat exchanger is installed in the ventilation duct, and to improve the heat exchanger's heat exchange capacity, the effective contact area between the heat exchanger and the air is generally large. This increases the air resistance in the ventilation duct and reduces the air velocity, requiring an increase in the power of the supply fan to complete the air supply work, thus increasing the power consumption of the fresh air handling unit.

[0049] Firstly, this application provides a fresh air handling unit, see [link to relevant documentation]. Figures 1 to 3 As shown, the fresh air handling unit includes:

[0050] The unit includes a blower 25, a heat exchanger 41, and a controller. The fresh air handling unit also comprises a first air supply chamber 2, a second air supply chamber 3, and a heat exchange channel 4, wherein the heat exchange channel 4 connects the first air supply chamber 2 and the second air supply chamber 3. The blower 25 is disposed in the first air supply chamber 2, and the heat exchanger 41 is disposed in the heat exchange channel 4.

[0051] See Figure 1 as well as Figure 5 As shown, when it is necessary to use the fresh air handling unit to supply fresh air into the room after heat exchanger 41, the fresh air handling unit is switched to the second fresh air mode. At this time, the controller can be used to close the first air outlet 22, and then the controller can be used to turn on the blower 25 and the heat exchanger 41, and control the second air outlet valve to open the second air outlet 32. See also Figure 5 As shown, at this time, under the action of the blower 25, fresh outdoor air is drawn into the first air supply chamber 2 through the fresh air inlet 23. Since the first air supply valve 21 closes the first air supply outlet 22, the fresh air in the first air supply chamber 2 cannot flow out of the first air supply outlet 22, but can only flow into the second air supply chamber 3 through the heat exchange channel 4. When the fresh air passes through the heat exchange channel 4, the heat exchanger 41 in the heat exchange channel 4 exchanges heat with the incoming fresh air to regulate the fresh air supply. Since the second air supply outlet 32 ​​is open, the heat-exchanged fresh air will eventually flow out from the second air supply outlet 32, bringing the appropriately priced fresh air into the room.

[0052] See Figure 4As shown, when the outdoor fresh air temperature is suitable, only fresh air needs to be introduced into the room without heat exchange, and the fresh air unit can be adjusted to the first fresh air mode. At this time, the controller closes the second air outlet 32 ​​and the heat exchanger 41, and then opens the first air outlet 22 and the blower 25. The blower 25 draws outdoor fresh air into the first air supply chamber 2, and the fresh air drawn into the first air supply chamber 2 can directly enter the room through the opened first air outlet 22. During the fresh air delivery process, it is not necessary to guide the fresh air into the heat exchange channel 4, avoiding increased air resistance in the heat exchanger 41 within the heat exchange channel 4, thereby reducing the load on the blower 25 and improving the energy-saving performance of the fresh air unit.

[0053] As can be seen from the above, the fresh air handling unit provided in this application can not only adjust the fresh air temperature using the heat exchanger 41 when the external environment is too cold or too hot, but also directly discharge the fresh air in the first air supply chamber 2 from the first air outlet 22 when the fresh air temperature does not need to be adjusted, avoiding the fresh air being obstructed by the heat exchanger 41 and increasing the power consumption of the blower 25. It is more energy-efficient than the previous fresh air handling units with adjustable fresh air temperature.

[0054] It should be noted that the heat exchanger 41 can be a composite heat exchanger 41 with both heating and cooling functions, thus enabling it to heat the gas in cold weather and cool the gas in hot weather. In other implementation scenarios, the heat exchanger 41 can also be a heating heat exchanger 41 with only heating function or a cooling heat exchanger 41 with only cooling function, to be suitable for regions that are cold or hot all year round.

[0055] In some implementations, a first air supply valve 21 is provided at the first air supply port 22 of the first air supply chamber 2, which can control the opening or closing of the first air supply port 22; a second air supply valve is provided at the second air supply port 32 of the second air supply chamber 3, which can control the opening or closing of the second air supply port 32. The first air supply valve 21, the second air supply valve, the blower 25, and the heat exchanger 41 are all electrically connected to a controller, which can control the state of the first air supply valve 21, the second air supply valve, the blower 25, and the heat exchanger 41 to achieve the switching of the ventilation state of the fresh air unit.

[0056] See Figure 1 and Figure 2 As shown, in some embodiments, a fresh air valve 24 is provided at the fresh air inlet 23 of the first air supply chamber 2. When the fresh air valve 24 opens the fresh air inlet 23, it allows fresh air from the outside to pass through the fresh air inlet 23; when the fresh air valve 24 closes the fresh air inlet 23, it can block the fresh air inlet 23 to prevent fresh air from the outside from entering the first air supply chamber 2 from the fresh air inlet 23.

[0057] Continue to refer to Figure 1 The housing 1 also forms a return air chamber 5 and a mixing air passage 6, which can be opened or closed. The return air chamber 5 has a return air inlet 51, and the mixing air passage 6 connects the return air chamber 5 to the first supply air chamber 2. A mixing ventilation valve 61 is provided at the mixing air passage 6. The return air inlet 51 is used to connect with the room so that the air in the room flows into the return air chamber 5 through the return air inlet 51. By providing a mixing ventilation valve 61 at the mixing air passage 6, the connection between the return air chamber 5 and the first supply air chamber 2 can be controlled. By connecting the return air chamber 5 and the first supply air chamber 2 through the mixing air passage 6, the return air in the return air chamber 5 can be directed to the first supply air chamber 2.

[0058] In normal return air mode, return air inlet 51 is open, mixing air channel 6 is open, and fresh air inlet 23 is closed, so that return air is sent in from the first air supply chamber and can be sent out from the first air supply port or the second air supply port.

[0059] In normal mixed air mode, the return air inlet 51, the fresh air inlet 23 and the mixed air channel 6 are all opened, so that the mixed air enters from the first air supply chamber 2 and can be sent out from the first air supply port 22 or the second air supply port 32.

[0060] In some implementations, a return air valve is provided at the return air inlet 51, and the return air inlet 51 can be opened or closed by controlling the state of the return air valve.

[0061] Specifically, when it is necessary to switch the fresh air unit to return air mode, the controller, which is electrically connected to the fresh air valve 24, can be used to close the fresh air inlet 23 and open the mixing ventilation valve 61 at the mixing air channel 6, thus connecting the return air chamber 5 to the first supply air chamber 2. Then, the controller controls the supply fan 25 to start, and the exhaust capacity of the supply fan 25 draws the indoor air into the return air chamber 5. Since the mixing ventilation valve 61 is open at this time, the air in the return air chamber 5 can flow into the first supply air chamber 2. Afterwards, depending on whether heat exchange of the air is required, the air is guided into the room from the first supply air outlet 22 or the second supply air outlet 32.

[0062] Since the return air chamber 5 is connected to the first supply air chamber 2 via the mixing air channel 6, and the first supply air chamber 2 is equipped with a fresh air inlet 23, the fresh air unit can be switched to the mixing air mode when it is necessary to simultaneously supply fresh air and return air to the room. Specifically, when the fresh air unit is switched to the mixing air mode, the controller opens the fresh air valve 24 and the mixing ventilation valve 61, and simultaneously turns on the supply fan 25 to draw outdoor air into the first supply air chamber 2 through the fresh air inlet 23, and draw indoor air into the return air chamber 5 through the return air inlet 51 and then back into the first supply air chamber 2. Then, depending on whether heat exchange is required, the air is directed into the room from the first supply air outlet 22 or the second supply air outlet 32. In other words, the fresh air assembly provided in this application can realize various ventilation scenarios such as fresh air ventilation, return air ventilation, and mixing air ventilation, meeting a variety of customer needs.

[0063] As can be seen from the above, by setting the valve body structure and cavity structure described above, this application uses a heat exchanger 41 to achieve heat exchange in various ventilation environments. Compared with setting a heat exchanger 41 in multiple air supply channels, the number of heat exchangers 41 is reduced, thereby reducing the cost of the fresh air unit.

[0064] If gas heat exchange is required, the controller can close the first air outlet 22 by opening the first air valve 21, and open the heat exchanger 41 and control the second air valve to open the second air outlet 32, so that the gas is heated or cooled by the heat exchanger 41 through the heat exchange channel 4 and flows out from the second air outlet 32 ​​of the second air chamber 3.

[0065] If gas heat exchange is not required, the controller can control the first air valve 21 to open the first air outlet 22, and then use the controller to close the heat exchanger 41 and control the second air valve to close the second air outlet 32, so that the gas in the first air chamber 2 flows out directly from the first air outlet 22 of the first air chamber 2.

[0066] In other words, the fresh air handling unit provided in this application can not only reduce the wind resistance during fresh air ventilation, but also reduce the wind resistance during mixed ventilation and return air ventilation, thereby improving energy-saving capabilities in various ventilation scenarios.

[0067] See Figure 1 As shown, in some implementations, the return air chamber 5 is also provided with an exhaust port 53, an exhaust valve 54 is provided between the exhaust port 53 and the return air inlet 51, an exhaust fan 52 is installed in the return air chamber 5, and the exhaust valve 54 and the exhaust fan 52 are electrically connected to the controller respectively.

[0068] The exhaust valve 54 can be controlled by the controller to open the exhaust port 53 and start the exhaust fan 52 to draw the indoor air from the return air inlet 51 into the return air chamber 5, and guide the air drawn into the return air chamber 5 to the exhaust port 53 to discharge it to the outside, thereby achieving the effect of exhausting the indoor air.

[0069] See Figure 1 , Figure 2 as well as Figure 3 As shown, in some implementations, the exhaust vent 53 and the return air inlet 51 are respectively located on opposite sides of the return air chamber 5, and the side of the return air chamber 5 with the return air inlet is connected to the mixing air channel 6. The exhaust fan 52 can drive the gas in the return air chamber 5 to the exhaust vent 53 to complete the exhaust work.

[0070] Due to the above configuration, the fresh air handling unit provided in this application can perform fresh air ventilation while performing exhaust ventilation, or perform mixed air ventilation at the same time.

[0071] Understandably, in some implementations, fresh air ventilation is performed simultaneously with exhaust ventilation. Specifically, when fresh air ventilation needs to be performed concurrently with exhaust ventilation, the mixing ventilation valve 61 can be controlled to close the mixing air passage 6, preventing the gas drawn into the return air chamber 5 by the exhaust fan 52 from flowing into the first supply air chamber 2 and being sent into the room. Then, the controller is used to control the supply fan 25 to start, and to control the first supply air valve 21 and the second supply air valve, so that one of the first supply air outlet 22 and the second supply air outlet 32 ​​is opened, thereby introducing fresh air into the room during exhaust ventilation and quickly refreshing the indoor air.

[0072] Of course, the exhaust fan 52 and the supply fan 25 can also be turned on simultaneously when the exhaust work is not being carried out, so as to improve the air supply capacity of return air supply or mixed air supply.

[0073] Specifically, during return air supply, the controller can be used to close the exhaust port 53 by controlling the exhaust valve 54 and close the fresh air inlet 23 by controlling the fresh air valve 24. Then, the controller can be used to open the mixing ventilation valve 61 to open the mixing duct 6. Since the supply fan 25 and the exhaust fan 52 have the same airflow direction at the mixing duct 6, the controller can be used to control the supply fan 25 and the exhaust fan 52 to start simultaneously, thereby increasing the air supply volume during return air supply.

[0074] Similarly, during mixed air supply, the controller can be used to close the exhaust port 53 by controlling the exhaust valve 54, open the fresh air inlet 23 by controlling the fresh air valve 24, and open the mixed air passage 6 by controlling the mixing ventilation valve 61. Then, the controller can be used to turn on the supply fan 25 and the exhaust fan 52 to increase the air supply volume during mixed air supply.

[0075] See Figure 1As shown, in some implementations, the direction of the maximum size of the first air supply cavity 2 is the first direction, and the second air supply cavity 3 and the return air cavity 5 are located on the same side of the first air supply cavity 2 in the second direction, wherein the first direction is perpendicular to the second direction.

[0076] Since the maximum dimension of the first air supply cavity 2 is in the first direction, and the second air supply cavity 3 is located on one side of the first air supply cavity 2 in the second direction, compared with setting the second air supply cavity 3 on one side of the first air supply cavity 2 in the first direction, the size of the housing 1 in the first direction is avoided from further increasing.

[0077] Similarly, by placing the return air cavity 5 on one side of the first air supply cavity 2 in the second direction, the size of the housing 1 in the first direction can also be avoided from increasing further. Moreover, since the return air cavity 5 and the second air supply cavity 3 are located on the same side of the first air supply cavity 2 in the second direction, the size of the housing 1 in the second direction is reduced compared to placing the return air cavity 5 and the second air supply cavity 3 on opposite sides of the first air supply cavity 2 in the second direction.

[0078] In some implementations, the second air supply cavity 3 and the return air cavity 5 are arranged adjacent to each other along the first direction to reduce the distance between the second air supply cavity 3 and the return air cavity 5 in the first direction, thereby making the size of the second air supply cavity 3 and the return air cavity 5 in the first direction smaller, reducing the size of the second air supply cavity 3 and the return air cavity 5 extending out of the first air supply cavity 2 in the first direction, thereby reducing the size of the housing 1 in the second direction.

[0079] In some implementations, the length of the first air supply cavity 2 in the first direction is a first length, the length of the second air supply cavity 3 in the first direction is a second length, and the length of the return air cavity 5 in the first direction is a third length, wherein the first length is greater than or equal to the second length plus the third length. By setting these dimensions, the second air supply cavity 3 or the return air cavity 5 can be prevented from extending beyond the first air supply cavity 2 in the first direction.

[0080] See Figure 1 As shown, in some implementations, a first filter 9 is respectively installed in the first air supply chamber 2 and the return air chamber 5. The first filter 9 can filter impurities in the gas, intercepting pollutants such as droplets and sewage, and providing cleaner gas during ventilation. In some implementations, a sterilization and disinfection structure or sterilization and disinfection agent can also be installed on the first filter 9, so that the gas is sterilized and disinfected as it passes through the first air supply chamber 2 or the return air chamber 5, thereby sterilizing and disinfecting the gas passing through the fresh air unit.

[0081] Specifically, the first filter 9 in the first air supply chamber 2 can be set on the air inlet side of the air supply fan 25 (the side of the air supply fan 25 near the fresh air inlet 23), and the first filter 9 in the return air chamber 5 can also be set on the air inlet side of the exhaust fan 52 (the side of the exhaust fan 52 near the return air inlet 51).

[0082] See Figure 1 As shown, in some implementations, the fresh air unit forms a first ventilation channel 81 connected to the first air supply cavity 2 and a second ventilation channel 82 connected to the second air supply cavity 3. The fresh air unit also forms a filter cavity 7, which is connected to the first ventilation channel 81 and the second ventilation channel 82 respectively. The filter cavity 7 has a third air outlet and a second filter 71 is installed in the filter cavity 7.

[0083] When the fresh air unit needs to be switched to emergency air supply mode, i.e., when further filtration of the air is required, the fresh air unit can be switched to emergency ventilation mode. At this time, the first air outlet 22 and the second air outlet 32 ​​can be closed, and one of the first ventilation channel 81 and the second ventilation channel 82 can be opened, so that the air flows into the filter chamber 7. After being filtered by the first filter 9, impurities and bacteria in the air are removed, and then the air is vented into the room through the third air outlet of the filter chamber 7 to provide clean airflow to the room.

[0084] It should be noted that emergency air supply can supply fresh air, return air, or mixed air into the room, and the incoming air can be heat exchanged through a heat exchange channel or the incoming air can be avoided from passing through the heat exchange channel.

[0085] See Figure 1 As shown, a first ventilation valve 811 is provided in the first ventilation channel 81, and a second ventilation valve 821 is provided in the second ventilation channel 82; the first ventilation valve 811 and the second ventilation valve 821 are respectively electrically connected to the controller. The controller controls the first ventilation valve 811 to open or close the first ventilation channel 81, and controls the second ventilation valve 821 to open or close the second ventilation channel 82.

[0086] In order to ensure the filtration effect on the airflow, the second filter 71 in the filter chamber 7 can be a high-efficiency filter with a higher filtration capacity than the first filter 9 set in the first air supply chamber 2.

[0087] It is provided with a first ventilation channel 81 that is connected to the first air supply chamber 2 and a second ventilation channel 82 that is connected to the second air supply chamber 3.

[0088] When the airflow temperature in the first air supply chamber 2 does not meet the air supply conditions, i.e., when heat exchange and temperature regulation of the airflow are required, the controller can first control the states of the first air supply valve 21, the second air supply valve, and the first ventilation valve 811 to close the first air supply outlet 22, the second air supply outlet 32, and the first ventilation channel 81, respectively. Then, the controller can control the state of the second ventilation valve 821 to open the second ventilation channel 82, allowing the blower 25 to send the airflow in the first air supply chamber 2 through the heat exchange channel 4 to the second air supply chamber 3, and then through the second ventilation channel 82 into the filter chamber 7. Then, the heat exchanger 41 in the heat exchange channel 4 is opened to achieve heat exchange and temperature regulation of the gas passing through the heat exchange channel 4. The second filter 71 in the filter chamber 7 is used to filter the heat-exchanged gas, and the filtered and heat-exchanged gas is guided from the third air supply outlet into the room to provide clean and comfortable airflow for the room.

[0089] When the airflow temperature in the first air supply chamber 2 meets the air supply conditions, i.e., when heat exchange and temperature regulation of the airflow are not required, the controller can control the state of the first air supply valve 21, the second air supply valve, and the second ventilation valve 821 to close the first air supply port 22, the second air supply port 32, and the second ventilation channel 82, respectively. Then, by controlling the state of the first ventilation valve 811, the first ventilation channel 81 is opened, allowing the gas flowing into the first air supply chamber 2 to flow into the filter chamber 7 through the first air supply channel, where the gas is filtered by the second filter 71.

[0090] See Figure 1 as well as Figure 3 As shown, in some implementations, the housing 1 is provided with a first partition 11, a second partition 12 and a third partition 13. The first partition 11 and the third partition 13 are parallel, and both the first partition 11 and the third partition 13 are perpendicular to the second partition 12. One end of the second partition 12 is connected to the middle area of ​​the first partition 11 (the area between the two ends of the first partition 11), and the middle area of ​​the second partition 12 (the area between the two ends of the second partition 12) is connected to the third partition 13. The inner wall of the housing 1, together with the first partition 11, the second partition 12 and the third partition 13, defines the first air supply cavity 2, the second air supply cavity 3, the return air cavity 5 and the filter cavity 7.

[0091] The filter chamber 7 is located on the side of the first partition 11 away from the second partition 12, the second air supply chamber 3 is located between the first partition 11 and the third partition 13, the return air chamber 5 is located on the side of the third partition 13 away from the first partition 11, and the first air supply chamber 2 is located on the side of the second partition 12 away from the third partition 13.

[0092] First, by using three partitions to define four chamber structures within the housing 1, the four chamber structures can be arranged more compactly compared to setting up independent ducts, thus reducing the footprint of the fresh air unit.

[0093] Furthermore, since the first partition 11 is perpendicular to the second partition 12, and one end of the second partition 12 is connected to the middle area of ​​the first partition 11, the first partition 11 and the second partition 12 form a T-shaped structure. Similarly, the second partition 12 is perpendicular to the third partition 13, and the middle area of ​​the second partition 12 is connected to the third partition 13, thus forming a T-shaped structure between the second partition 12 and the third partition 13. The second air supply cavity 3 is located between the first partition 11 and the third partition 13.

[0094] The above structural arrangement arranges the first air supply chamber 2, the filter chamber 7, and the second air supply chamber 3 adjacent to each other. Compared to arranging the chambers in a straight line, this shortens the distance between the chambers. Compared to placing the second air supply chamber 3 between the first air supply chamber 2 and the filter chamber 7, this shortens the ventilation path during urgent non-heat exchange ventilation. Compared to placing the filter chamber 7 between the first air supply chamber 2 and the second air supply chamber 3, this shortens the ventilation path during various heat exchange ventilation scenarios. In other words, through the chamber arrangement of this application, not only can the space occupied by the fresh air handling unit be reduced, but the path in various ventilation scenarios can also be shortened as much as possible, reducing the wind resistance caused by the ventilation path and improving the energy-saving capability of the fresh air handling unit.

[0095] Meanwhile, the above structural arrangement also takes into account that the second air supply cavity 3 does not contain components such as the blower 25 and the filter, so the volume of the second air supply cavity 3 can be set to be smaller. Thus, the return air cavity 5 and the second air supply cavity 3 are located on the same side of the second partition 12. This not only makes the return air cavity 5 adjacent to the first air supply cavity 2, shortening the ventilation path between the return air cavity 5 and the first air supply cavity 2, but also effectively utilizes the internal space of the housing 1, reducing the volume of the fresh air unit.

[0096] See Figure 1 , Figure 2 as well as Figure 3 As shown, in some implementations, the first ventilation channel 81 and the second ventilation channel 82 are respectively formed in the first partition 11, the heat exchange channel 4 is formed on the side of the second partition 12 close to the first partition 11, and the mixing channel 6 is formed on the side of the second partition 12 away from the first partition 11.

[0097] In other words, by directly creating ventilation channels on each partition, compared to setting up additional pipes to connect each chamber, the ventilation channels created on the partition do not generate additional volume, which is conducive to the miniaturization of the fresh air unit.

[0098] See Figure 1 as well as Figure 3As shown, the first air supply outlet 22, the second air supply outlet 32, the third air supply outlet, and the return air outlet of the fresh air handling unit are all located on the side of the casing 1 facing the room, which facilitates gas exchange with the indoor air. The fresh air inlet 23 and the exhaust outlet 53 of the fresh air handling unit are both located on the side of the casing 1 facing the wall, so that the fresh air inlet 23 and the exhaust outlet 53 can be connected to the relevant ventilation ducts to achieve gas exchange with the outside air.

[0099] See Figure 1 As shown, in some implementations, the fresh air handling unit is a vertical unit, placed directly on the indoor floor. In other implementations, the fresh air handling unit can also be a ceiling-mounted unit, installed indoors by hanging.

[0100] Secondly, this utility model also provides a control method for a fresh air handling unit, used to control the aforementioned fresh air handling unit, wherein the fresh air handling unit has a first fresh air mode and a second fresh air mode, and the control method includes:

[0101] In the first fresh air mode, the first air outlet 22 on the first air supply chamber 2 of the fresh air unit is opened, the second air outlet 32 ​​on the second air supply chamber 3 of the fresh air unit is closed, and the heat exchanger 41 in the heat exchange channel 4 of the fresh air unit is closed, so that fresh air is sent out from the first air outlet 22.

[0102] In the second fresh air mode, the first air outlet 22 on the first air supply chamber 2 of the fresh air unit is closed, the second air outlet 32 ​​on the second air supply chamber 3 of the fresh air unit is opened, and the heat exchanger 41 in the heat exchange channel 4 of the fresh air unit is opened, so that fresh air is sent out from the second air outlet 32.

[0103] Among them, the first and second fresh air modes do not pass through the filter chamber and are collectively referred to as the normal fresh air mode.

[0104] In other words, when fresh air needs to be supplied to the room and the outdoor air temperature meets the supply air temperature requirements, the fresh air unit should be switched to the first fresh air mode. See also Figure 1 as well as Figure 4 As shown, at this time, the airflow from the fresh air unit into the room only passes through the first air supply cavity 2, and does not pass through the heat exchange channel 4 and the second air supply cavity 3. This avoids the heat exchanger 41 in the heat exchange channel 4 from reducing the air supply speed, reduces the power consumption of the blower 25 in the first air supply cavity 2, and improves the energy-saving performance of the fresh air unit.

[0105] When fresh air needs to be supplied to the room, and the temperature of the outdoor fresh air does not meet the supply air temperature requirements, the fresh air unit should be switched to the second fresh air mode. See also Figure 1 as well as Figure 5As shown, fresh air passes through the heat exchange channel 4, and the temperature of the airflow is determined by the heat exchanger 41 in the heat exchange channel 4, so that the temperature of the incoming fresh air meets the supply air temperature requirements.

[0106] The above only describes the opening and closing status of the first air outlet 22 and the second air outlet 32. In reality, when switching the fresh air unit to the first fresh air mode or the second fresh air mode, the controller also needs to control the status of the first ventilation valve 811, the second ventilation valve 821, and the mixing ventilation valve 61 to close the first ventilation channel 81, the second ventilation channel 82, and the mixing ventilation valve 61, respectively. Furthermore, the controller needs to control the status of the fresh air valve 24 to open the fresh air inlet 23. This limits the flow direction of the supplied airflow to the first air outlet 2 and the second air outlet 3.

[0107] In emergency ventilation mode, the first air outlet 22 and the second air outlet 32 ​​of the fresh air unit are closed, and the first ventilation channel 81 or the second ventilation channel 82 is opened, so that the airflow enters the filter chamber from the first ventilation channel 81 or the second ventilation channel 82, and then exits from the third air outlet of the filter chamber.

[0108] Emergency ventilation modes include emergency fresh air mode, emergency return air mode, and emergency mixed air mode. The emergency fresh air mode can be further subdivided into the third fresh air mode and the fourth fresh air mode.

[0109] Specifically, when there is an urgent need to supply fresh air, and the outdoor fresh air temperature meets the supply air temperature requirements, the fresh air unit should be switched to the third fresh air mode. See also Figure 1 as well as Figure 6 As shown, at this time, the controller controls the opening of the fresh air inlet 23, the first ventilation channel 81, and the blower 25, and controls the closing of the mixing channel 6, the first air supply channel, the second air supply channel, the second ventilation channel 82, and the heat exchanger 41, so that the fresh air flowing in from the fresh air inlet 23 flows directly from the first air supply chamber 2 to the filter chamber 7, and is finally sent out from the third air outlet of the filter chamber 7.

[0110] When there is an urgent need to supply fresh air, and the outdoor fresh air temperature does not meet the supply air temperature requirements, necessitating heat exchange with the outdoor fresh air, switch the fresh air unit to the fourth fresh air mode. See also Figure 1 as well as Figure 7 As shown, at this time, the controller controls the opening of the fresh air inlet 23, the second ventilation channel 82, the blower 25 and the heat exchanger 41, and controls the closing of the mixing ventilation channel, the first air supply channel, the second air supply channel and the first ventilation channel 81, so that the fresh air flowing in from the fresh air inlet 23 first passes through the heat exchange channel 4 for heat exchange and then flows into the filter chamber 7, and finally is sent out from the third air outlet of the filter chamber 7.

[0111] In addition, the control method provided in this embodiment can also control the fresh air unit to perform normal return air ventilation and emergency return air ventilation.

[0112] In the normal return air mode, the fresh air inlet 23 in the first air supply chamber 2 is closed, and the mixing channel 6 connecting the first air supply chamber 2 and the return air chamber 5 is opened, so that the return air enters from the first air supply chamber 2 and can be sent out from the first air supply outlet 22 or the second air supply outlet 32.

[0113] In normal mixed air mode, the fresh air inlet 23 in the first air supply chamber 2 is opened, and the mixed air channel 6 connecting the first air supply chamber 2 and the return air chamber 5 is opened, so that the mixed air enters from the first air supply chamber 2 and can be sent out from the first air supply outlet 22 or the second air supply outlet 32.

[0114] The normal return air mode includes the first return air mode and the second return air mode, and the normal mixed air mode includes the first mixed air mode and the second mixed air mode.

[0115] Specifically, when the fresh air handling unit is needed for normal return air ventilation, and the return air temperature meets the supply air temperature, the fresh air handling unit should be switched to the first return air mode. See also Figure 1 as well as Figure 8 As shown, at this time, the controller controls the opening of the mixing air channel 6, the first air supply outlet 22, and the air supply fan 25, and controls the closing of the first ventilation channel 81, the second ventilation channel 82, the second air supply outlet 32, the fresh air inlet 23, the exhaust outlet 53, and the exhaust fan 52. The air in the room is drawn into the first air supply chamber 2 from the return air inlet 51 by the air supply fan 25, and then returned to the room from the first air supply outlet 22.

[0116] When the fresh air handling unit is needed for normal return air ventilation, and the return air temperature does not meet the supply air temperature, requiring heat exchange of the return air flow, switch the fresh air handling unit to the second return air mode. See also Figure 1 as well as Figure 9 As shown, at this time, the controller closes the first air supply outlet 22, the fresh air inlet 23, the exhaust outlet 53, the first ventilation channel 81, the second ventilation channel 82, and the exhaust fan 52, and opens the second air supply outlet 32, the mixing channel 6, the heat exchanger 41, and the blower 25. The blower 25 guides the airflow at the return air inlet 51 through the heat exchange channel 4 for heat exchange, and then guides it into the second air supply chamber 3, from where it is returned to the room through the second air supply outlet 32.

[0117] The above text mentions that emergency ventilation modes include emergency return air modes, and the specific emergency return air modes include the third return air mode and the fourth return air mode.

[0118] When emergency return air ventilation using the fresh air handling unit is required, and the return air temperature meets the supply air temperature, switch the fresh air handling unit to the third return air mode. See also Figure 1 as well as Figure 10As shown, at this time, the controller controls the first air outlet 22, the second air outlet 32, the fresh air inlet 23, the exhaust outlet 53, the second ventilation channel 82, the heat exchanger 41, and the exhaust fan 52 to close, and controls the first ventilation channel 81 and the air supply fan 25 to open. The air supply fan 25 guides the airflow at the return air inlet 51 into the first air supply chamber 2, so that the airflow in the first air supply chamber 2 passes through the first ventilation channel 81 and flows into the filter chamber 7. The return airflow is sent to the room from the third air outlet at the filter chamber 7.

[0119] When a fresh air handling unit is needed for emergency return air ventilation, and the return air temperature does not meet the supply air temperature, requiring heat exchange of the return air flow, switch the fresh air handling unit to the fourth return air mode. See also... Figure 1 as well as Figure 11 As shown, at this time, the controller closes the first air outlet 22, the second air outlet 32, the fresh air inlet 23, the exhaust outlet 53, the first ventilation channel 81, and the exhaust fan 52, and opens the second ventilation channel 82, the heat exchanger 41, and the blower 25. The blower 25 guides the airflow at the return air inlet 51 into the first air supply chamber 2. The gas in the first air supply chamber 2 passes through the heat exchange channel 4 and then into the filter chamber 7. Not only is heat exchange achieved using the heat exchanger 41, but the second filter 71 also filters the return airflow.

[0120] It should also be noted that the control method provided in this application can also control the fresh air unit to perform mixed air ventilation, while simultaneously introducing fresh air and return air into the room.

[0121] When normal mixed-air ventilation is required indoors, and the temperature of the airflow in the first air supply chamber 2 meets the supply air temperature requirements, the fresh air unit should be switched to the first mixed-air mode. (See also...) Figure 1 as well as Figure 12 As shown, specifically, the controller controls the opening of the fresh air inlet 23, the mixing air duct 6, the supply fan 25, and the first supply air outlet 22, and controls the closing of the exhaust outlet 53, the second supply air outlet 32, the first ventilation duct 81, the second ventilation duct 82, the exhaust fan 52, and the heat exchanger 41. This causes the airflow at the fresh air inlet 23 and the airflow at the return air inlet 51 to be simultaneously drawn into the first supply air chamber 2 and discharged into the room from the first supply air outlet 22, providing mixed air for the room.

[0122] When normal mixed-air ventilation is required indoors, and the air temperature in the first air supply chamber 2 does not meet the supply air temperature, necessitating heat exchange of the airflow in the first air supply chamber 2, the fresh air unit should be switched to the second mixed-air mode. (See also...) Figure 1 as well as Figure 13As shown, specifically, the controller controls the opening of the fresh air inlet 23, the mixing air channel 6, the supply fan 25, the heat exchanger 41, and the second air outlet 32, and controls the closing of the exhaust outlet 53, the first air outlet 22, the first ventilation channel 81, the exhaust fan 52, and the second ventilation channel 82. This causes the airflow at the fresh air inlet 23 and the airflow at the return air inlet 51 to be simultaneously drawn into the first air supply chamber 2. The gas in the first air supply chamber 2 passes through the heat exchange channel 4 into the second air supply chamber 3, and then flows out from the second air outlet 32 ​​of the second air supply chamber 3. While providing mixed air to the room, heat exchange of the mixed air is also achieved, ensuring that the temperature of the incoming mixed air meets the supply air temperature.

[0123] The above text mentions that emergency ventilation modes include emergency mixed air modes, and the specific emergency mixed air modes include the third mixed air mode and the fourth mixed air mode.

[0124] When urgent indoor air mixing ventilation is required, and the airflow temperature in the first air supply chamber 2 meets the supply air temperature, the fresh air unit is switched to the third mixing mode. For details, see [link to details]. Figure 1 as well as Figure 14 As shown, the controller closes the first air inlet 22, the second air inlet 32, the exhaust outlet 53, the heat exchanger 41, the exhaust fan 52, and the second ventilation duct 82, and opens the fresh air inlet 23, the mixing air duct 6, the first ventilation duct 81, and the blower 25. Fresh air from the fresh air inlet 23 and return air from the return air inlet 51 are simultaneously introduced into the first air supply chamber 2, and then flow from the first ventilation duct 81 into the filter chamber 7. The second filter 71 filters impurities or bacteria from the mixed air, allowing the cleaned mixed air to exit from the third air outlet of the filter chamber 7.

[0125] When urgent indoor air mixing ventilation is required, and the airflow temperature in the first air supply chamber 2 does not meet the supply air temperature, the fresh air unit will be switched to the fourth mixing mode. For details, please refer to... Figure 1 as well as Figure 15 As shown, the controller closes the first air inlet 22, the second air inlet 32, the exhaust outlet 53, the exhaust fan 52, and the first ventilation duct 81, while opening the fresh air inlet 23, the mixing air duct 6, the second ventilation duct 82, the blower 25, and the heat exchanger 41. Fresh air from the fresh air inlet 23 and return air from the return air inlet 51 are simultaneously introduced into the first air supply chamber 2, and then flow into the second air supply chamber 3 through the heat exchange duct 4 to complete heat exchange. This allows the gas in the second air supply chamber 3 to flow into the filter chamber 7 through the second ventilation duct 82, and then exit from the third air outlet of the filter chamber 7. This not only heats the gas using the heat exchanger 41 but also filters out impurities in the mixed air using the second filter chamber 7, providing suitable and clean mixed air for the room.

[0126] When it is necessary to exhaust indoor air, the fresh air unit can be switched to exhaust mode. Specifically, the controller controls the exhaust vent 53 and exhaust fan 52 to open, allowing the air in the return air chamber 5 to be exhausted from the exhaust vent 53. It should be noted that the exhaust mode can be used simultaneously with the various air supply modes mentioned above.

[0127] In summary, the control method provided in this application can enable the fresh air handling unit to operate in at least 13 modes, which can meet the air supply needs under various conditions.

[0128] For ease of understanding, please refer to the table below for the control states of various modes.

[0129]

[0130] In a third aspect, embodiments of the present invention also provide a storage medium storing a computer program, which, when executed by a processor, implements any of the control methods in the second aspect.

[0131] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be implemented as an Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor, or other electronic component, for executing the methods in the above embodiments.

[0132] The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Computer-readable storage media can include, but are not limited to, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, and computer storage media (e.g., hard disks, floppy disks, solid-state drives, removable disks, CD-ROMs, DVD-ROMs, Blu-ray discs, etc.).

[0133] The storage medium may also store at least one computer-executable program / instruction, such as computer-readable instructions. Computer-readable storage media include, but are not limited to, volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Computer-readable storage media may include, for example, read-only memory (ROM), hard disk, flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device executes the computer-readable instructions stored on the computer-readable storage medium, the various methods described above can be performed.

[0134] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fresh air handling unit, characterized in that, It includes: The system comprises a first air supply chamber, a second air supply chamber, and a heat exchange channel with a heat exchanger. The first air supply chamber and the second air supply chamber are connected through the heat exchange channel. The first air supply chamber is provided with a first air outlet that can be opened or closed, and the second air supply chamber is provided with a second air outlet that can be opened or closed. In the first fresh air mode, the first air outlet is opened, the second air outlet is closed, and the heat exchanger is turned off, so that fresh air is sent out from the first air outlet. In the second fresh air mode, the first air outlet is closed, the second air outlet is opened, and the heat exchanger is turned on, so that fresh air passes through the first air outlet, the heat exchange channel, and the second air outlet in sequence before being sent out from the second air outlet.

2. The fresh air handling unit according to claim 1, characterized in that, A first air supply valve is provided at the first air supply outlet, and the first air supply valve is used to close or open the first air supply outlet. A second air supply valve is provided at the second air supply outlet, and the second air supply valve is used to close or open the second air supply outlet; The fresh air handling unit includes a controller, which is electrically connected to the first air supply valve and the second air supply valve respectively.

3. The fresh air handling unit according to claim 1 or 2, characterized in that, The first air supply cavity is provided with a fresh air inlet; The fresh air unit also includes a return air chamber and a mixing air channel. The return air chamber has a return air inlet, and the mixing air channel connects the return air chamber to the first supply air chamber. The mixing air channel can be opened or closed. In the normal return air mode, the return air inlet is open, the mixing air channel is open, and the fresh air inlet is closed, so that the return air enters from the first air supply chamber and can be sent out from the first air supply port or the second air supply port. In normal mixed air mode, the return air inlet is open, the mixed air channel is open, and the fresh air inlet is open, so that the mixed air enters from the first air supply chamber and can be sent out from the first air supply port or the second air supply port.

4. The fresh air handling unit according to claim 3, characterized in that, The return air chamber is also provided with an exhaust port, and an exhaust valve is provided between the exhaust port and the return air inlet; An exhaust fan is installed in the return air chamber. In exhaust mode, the exhaust port is opened, and the return air chamber is ventilated.

5. The fresh air handling unit according to claim 4, characterized in that, The exhaust vent and the return air inlet are respectively located on opposite sides of the return air chamber, and the side of the return air chamber with the return air inlet is connected to the mixing air channel.

6. The fresh air handling unit according to claim 3, characterized in that, The direction of the maximum size of the first air supply cavity is the first direction; The second air supply cavity and the return air cavity are located on the same side of the first air supply cavity in a second direction, wherein the second direction is perpendicular to the first direction.

7. The fresh air handling unit according to claim 6, characterized in that, The first air supply cavity is connected to the heat exchange channel and the mixing channel on opposite sides along the first direction, respectively; One side of the return air chamber is connected to the mixing air channel, and the other side of the return air chamber extends toward the second supply air chamber.

8. The fresh air handling unit according to claim 3, characterized in that, The first air supply chamber and the return air chamber are each provided with a first filter.

9. The fresh air handling unit according to claim 3, characterized in that, The fresh air unit also includes a first ventilation channel connected to the first air supply cavity, a second ventilation channel connected to the second air supply cavity, and a filter cavity. The filter cavity is connected to the first ventilation channel and the second ventilation channel respectively. The filter cavity has a third air outlet and a second filter is installed in the filter cavity. In emergency ventilation mode, the first air outlet and the second air outlet are closed, and the first ventilation channel or the second ventilation channel is opened, so that airflow enters the filter chamber from the first ventilation channel or the second ventilation channel, and then exits from the third air outlet of the filter chamber.

10. The fresh air handling unit according to claim 9, characterized in that, It also includes the casing, The housing is provided with a first partition, a second partition, and a third partition. The first partition and the third partition are parallel, and both the first partition and the third partition are perpendicular to the second partition. One end of the second partition is connected to the middle area of ​​the first partition, and the middle area of ​​the second partition is connected to the third partition. The inner wall of the housing, together with the first partition, the second partition, and the third partition, defines the first air supply cavity, the second air supply cavity, the return air cavity, and the filter cavity. The filter chamber is located on the side of the first partition away from the second partition, the second air supply chamber is located between the first partition and the third partition, the return air chamber is located on the side of the third partition away from the first partition, and the first air supply chamber is located on the side of the second partition away from the third partition.

11. The fresh air handling unit according to claim 10, characterized in that, The first ventilation channel and the second ventilation channel are both formed in the first partition, the heat exchange channel is formed on the side of the second partition close to the first partition, and the air mixing channel is formed on the side of the second partition away from the first partition.

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