Fresh air conditioning system

Abstract

The utility model relates to the technical field of household appliances, and discloses a fresh air conditioning system. The fresh air conditioning system comprises a machine shell, a fan, a heat exchanger and an air return valve body. The machine shell is provided with an air supply cabin, a mixing cabin and an air return duct which are sequentially communicated, the air supply cabin is provided with an air outlet communicated with the indoor space, the mixing cabin is provided with a fresh air opening communicated with the outdoor space, and the air return duct is provided with an air return opening communicated with the indoor space; the fan is arranged in the air supply cabin, and the air supply direction of the fan is limited to face the air outlet; the heat exchanger is arranged in the mixing cabin; the air return valve body is arranged in the air return duct and used for blocking or dredging the air return duct. By means of the arrangement, the indoor temperature and humidity can be prevented from being greatly degraded, and then the use experience of a user is improved.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, such as a fresh air conditioning system. Background Technology

[0002] As society develops, people have increasingly higher requirements for their living environment. Indoor air sometimes contains volatile organic compounds or dust, which can affect human health. Therefore, users now install fresh air conditioning systems indoors to introduce outdoor air as needed, thereby improving indoor air quality.

[0003] In related technologies, when a fresh air conditioning system is operating in fresh air mode, the fan will directly introduce outdoor air into the room.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In existing technologies, fresh air conditioning systems directly introduce outdoor air into the room via a fan. Therefore, if the temperature and humidity of the outdoor air differ significantly from those of the indoor air, directly introducing outdoor air into the room will cause a large variation in indoor temperature and humidity, thus affecting the user experience.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a fresh air conditioning system that, when operating in fresh air mode, can simultaneously draw indoor air into a mixing chamber through a return air vent and a return air duct, mixing the indoor and outdoor air before blowing the mixed air back into the room. This configuration avoids significant fluctuations in indoor temperature and humidity, thereby improving the user experience.

[0009] This disclosure provides a fresh air conditioning system including: a casing, a fan, a heat exchanger, and a return air valve body. The casing is provided with a supply air chamber, a mixing chamber, and a return air duct connected in sequence. The supply air chamber is provided with an air outlet communicating with the indoor environment, the mixing chamber is provided with a fresh air inlet communicating with the outdoor environment, and the return air duct is provided with a return air inlet communicating with the indoor environment. The fan is located in the supply air chamber, and the air supply direction of the fan is limited to facing the air outlet. The heat exchanger is located in the mixing chamber. The return air valve body is located in the return air duct and is used to block or unblock the return air duct.

[0010] In some embodiments, the fresh air conditioning system further includes a fresh air valve body. The fresh air valve body is disposed at the fresh air inlet and is used to block or unblock the fresh air inlet.

[0011] In some embodiments, the fresh air conditioning system further includes a control element and a temperature sensor. The control element is electrically connected to the return air valve and the fresh air valve, respectively; the temperature sensor is electrically connected to the control element and is used to acquire the outdoor temperature; wherein the control element can control the opening degree of the return air valve and the fresh air valve according to the outdoor temperature.

[0012] In some embodiments, the fresh air conditioning system further includes a humidity sensor. The humidity sensor is electrically connected to a control element and is used to acquire outdoor humidity; wherein the control element can control the opening degree of the return air valve and the fresh air valve based on the outdoor humidity.

[0013] In some embodiments, the fresh air conditioning system further includes a humidification component. The humidification component is disposed in the mixing chamber and is electrically connected to a control element; wherein the control element can control the humidification power of the humidification component according to the outdoor humidity.

[0014] In some embodiments, the fresh air inlet is provided with a rotatable fresh air valve plate to form a fresh air valve body. The fresh air air conditioning system also includes a first motor. The first motor is drivenly connected to the fresh air valve plate to drive the fresh air valve plate to rotate, thereby controlling the opening degree of the fresh air valve plate.

[0015] In some embodiments, the return air duct is provided with a rotatable return air valve plate to form a return air valve body. The fresh air air conditioning system also includes a second motor. The second motor is drivenly connected to the return air valve plate to drive the return air valve plate to rotate, thereby controlling the opening degree of the return air valve body.

[0016] In some embodiments, the fresh air conditioning system further includes a filter. The filter is disposed in the mixing chamber and is located on the side of the heat exchanger near the fresh air inlet.

[0017] In some embodiments, the connection between the return air duct and the mixing chamber is located on the side of the filter closer to the fresh air inlet.

[0018] In some embodiments, the fresh air conditioning system further includes an electric heating device. The electric heating device is disposed in the mixing compartment.

[0019] The fresh air conditioning system provided in this disclosure can achieve the following technical effects:

[0020] This disclosure provides a fresh air conditioning system including a casing, a fan, a heat exchanger, and a return air valve. The casing has a supply air chamber, a mixing chamber, and a return air duct connected sequentially. The supply air chamber has an air outlet communicating with the indoor environment, the mixing chamber has a fresh air inlet communicating with the outdoors, and the return air duct has a return air inlet communicating with the indoor environment. The fan is located in the supply air chamber, and its airflow direction is limited to the air outlet. The heat exchanger is located in the mixing chamber. The return air valve is located in the return air duct and is used to block or clear the return air duct. In this way, when the fresh air conditioning system draws in outdoor fresh air, and there is a significant difference between the outdoor and indoor temperature and humidity, the return air valve can clear the return air duct, drawing indoor air into the mixing chamber through the return air duct and the return air duct itself, thus mixing the indoor and outdoor air before blowing the mixed air back into the room. This design avoids significant fluctuations in indoor temperature and humidity, thereby improving the user experience.

[0021] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0023] Figure 1 This is a schematic diagram of the structure of a fresh air conditioning system provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of the internal structure of a fresh air conditioning system provided in an embodiment of this disclosure;

[0025] Figure 3 This is an airflow diagram of a fresh air conditioning system in fresh air mode, provided in an embodiment of this disclosure;

[0026] Figure 4 This is an airflow diagram of a fresh air conditioning system in mixed mode provided in an embodiment of this disclosure;

[0027] Figure 5 This is an airflow diagram of a fresh air conditioning system in internal circulation mode, provided in an embodiment of this disclosure.

[0028] Figure label:

[0029] 10: Casing; 101: Supply air compartment; 102: Mixing compartment; 103: Return air duct; 11: Air outlet; 12: Return air inlet; 13: Fresh air inlet;

[0030] 21: Return air valve body; 22: Fresh air valve body;

[0031] 31: Fan; 32: Heat exchanger; 33: Filter screen; 34: Electric heating device. Detailed Implementation

[0032] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0033] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0034] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0035] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0036] Unless otherwise stated, the term "multiple" means two or more.

[0037] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0038] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0040] like Figures 1 to 5 As shown in the figure, this embodiment of the present disclosure provides a fresh air conditioning system. When operating in fresh air mode, indoor air can also be simultaneously drawn into the mixing chamber 102 through the return air vent 12 and the return air duct 103 to mix the indoor and outdoor air, and then the mixed air is blown back into the room. This configuration can avoid significant changes in indoor temperature and humidity, thereby improving the user experience.

[0041] like Figures 1 to 5 As shown, this embodiment of the present disclosure provides a fresh air conditioning system including: a housing 10, a fan 31, a heat exchanger 32, and a return air valve body 21. The housing 10 is provided with a supply air chamber 101, a mixing chamber 102, and a return air duct 103 connected in sequence. The supply air chamber 101 is provided with an air outlet 11 communicating with the indoor environment, the mixing chamber 102 is provided with a fresh air inlet 13 communicating with the outdoor environment, and the return air duct 103 is provided with a return air inlet 12 communicating with the indoor environment. The fan 31 is disposed in the supply air chamber 101, and the air supply direction of the fan 31 is limited to facing the air outlet 11. The heat exchanger 32 is disposed in the mixing chamber 102. The return air valve body 21 is disposed in the return air duct 103, and the return air valve body 21 is used to block or unclog the return air duct 103.

[0042] Specifically, the heat exchanger 32 is installed in the mixing chamber 102 to cool or heat the air in the mixing chamber 102. The mixing chamber 102 is connected to the air supply chamber 101, and the air outlet 11 is located on the side of the air supply chamber 101 away from the mixing chamber 102, so that the fan 31 can introduce the air in the mixing chamber 102 into the air supply chamber 101 and blow it into the room through the air outlet 11.

[0043] like Figure 3 As shown, when the difference between outdoor and indoor temperature and humidity is small, the air conditioner operates in fresh air mode, causing the return air valve 21 to block the return air duct 103. At this time, the negative pressure generated by the fan 31 can first introduce outdoor air into the mixing chamber 102 through the fresh air inlet 13, then introduce the air in the mixing chamber 102 into the supply air chamber 101, and finally blow it into the room through the air outlet 11. This setup, by completely introducing fresh outdoor air, can quickly improve indoor air quality.

[0044] like Figure 4 As shown, when there is a significant difference between the outdoor and indoor temperatures and humidity, the air conditioner operates in mixing mode to clear the return air duct 103 through the return air valve 21. At this time, the negative pressure generated by the fan 31 can simultaneously introduce indoor air into the mixing chamber 102 through the return air vent 12 and the return air duct 103, allowing the indoor and outdoor air to mix. After the indoor and outdoor air are mixed, the fan 31 can introduce the mixed air from the mixing chamber 102 into the supply air chamber 101 and blow it into the room through the air outlet 11. This configuration reduces the temperature difference between the mixed air and the indoor air by mixing the indoor and outdoor air, thereby reducing the impact on indoor temperature and humidity and improving the user experience.

[0045] In the above embodiment, when the return air valve body 21 clears the return air duct 103, the opening degree of the return air valve body 21 can be set according to the user's actual needs, so as to control the amount of indoor air flowing into the mixing chamber 102 and thereby adjust the temperature and humidity of the mixed air.

[0046] like Figure 2 As shown, in some embodiments, the fresh air conditioning system further includes a fresh air valve body 22. The fresh air valve body 22 is disposed at the fresh air inlet 13 and is used to block or unblock the fresh air inlet 13.

[0047] Specifically, when the air conditioner is operating in fresh air mode and mixed mode, the fresh air valve 22 opens the fresh air inlet 13 to introduce outdoor air into the mixed chamber 102 via the fan 31. When the air conditioner is operating in recirculation mode, the fresh air valve 22 blocks the fresh air inlet 13, and only indoor air is introduced into the mixed chamber 102 through the return air inlet 12 and return air duct 103. After the heat exchanger 32 has completed cooling or heating of the air in the mixed chamber 102, the fan 31 then blows the air from the mixed chamber 102 into the room to complete indoor air circulation. Figure 5 As shown.

[0048] In the above embodiment, when the fresh air valve body 22 is clear of the fresh air inlet 13, the user can control the opening of the fresh air valve body 22 according to actual needs, so as to control the amount of outdoor air flowing into the mixing chamber 102 and thereby adjust the temperature and humidity of the mixed air.

[0049] In some embodiments, the fresh air conditioning system further includes a control element and a temperature sensor. The control element is electrically connected to the return air valve body 21 and the fresh air valve body 22, respectively; the temperature sensor is electrically connected to the control element and is used to acquire the outdoor temperature; wherein, the control element can control the opening degree of the return air valve body 21 and the fresh air valve body 22 according to the outdoor temperature.

[0050] Specifically, the control element is electrically connected to the return air valve 21 and the fresh air valve 22 respectively, so that the control element can control the return air valve 21 and the fresh air valve 22 independently. The control element can adjust the opening of the return air valve 21 between 0% and 100% according to the outdoor temperature. A 0% opening of the return air valve 21 means that the return air valve 21 blocks the return air duct 103, and a 100% opening means that the return air valve 21 completely unblocks the return air duct 103. The control element can also adjust the opening of the fresh air valve 22 between 0% and 100% according to the outdoor temperature. A 0% opening of the fresh air valve 22 means that the fresh air valve 22 blocks the fresh air inlet 13, and a 100% opening means that the return air valve 21 completely unblocks the fresh air inlet 13. With this configuration, the control components can automatically adjust the opening of the return air valve 21 and the fresh air valve 22 according to the outdoor temperature, so as to adjust the ratio of fresh air and indoor air in the mixing chamber 102.

[0051] In some embodiments, the fresh air conditioning system further includes a humidity sensor. The humidity sensor is electrically connected to the control element and is used to acquire outdoor humidity; wherein the control element can control the opening degree of the return air valve 21 and the fresh air valve 22 according to the outdoor humidity.

[0052] Specifically, the control element can adjust the opening of the return air valve 21 between 0% and 100% based on the outdoor humidity, and adjust the opening of the fresh air valve 22 between 0% and 100% based on the outdoor temperature. With this configuration, the control element can automatically adjust the opening of the return air valve 21 and the fresh air valve 22 according to the outdoor humidity.

[0053] In practical applications, temperature and humidity sensors can be installed at the fresh air inlet 13 to facilitate the acquisition of outdoor temperature and humidity.

[0054] In dry, low-humidity weather, the lower the temperature and humidity, the larger the opening of the return air valve 21 and the smaller the opening of the fresh air valve 22. For example, when 0℃ < outdoor temperature ≤ 5℃ and 20% < outdoor humidity ≤ 40%, the internal circulation damper opens 30% and the fresh air inlet 13 damper opens 70%; when 0℃ < outdoor temperature ≤ 5℃ and outdoor humidity ≤ 20%, the internal circulation damper opens 50% and the fresh air inlet 13 damper opens 50%; when -10℃ < outdoor temperature ≤ 0℃ and outdoor humidity ≤ 20%, the internal circulation damper opens 70% and the fresh air inlet 13 damper opens 30%; when outdoor temperature ≤ -10℃ and outdoor humidity ≤ 20%, the internal circulation damper opens 100% and the fresh air inlet 13 damper opens 0%.

[0055] In hot and humid weather, the higher the temperature and humidity, the larger the opening of the return air valve 21 and the smaller the opening of the fresh air valve 22. For example, when the outdoor temperature is between 30℃ and 35℃ and the outdoor humidity is between 70% and 80%, the internal circulation damper is opened to 30% and the fresh air inlet 13 damper is opened to 70%; when the outdoor temperature is between 35℃ and 38℃ and the outdoor humidity is between 80% and 90%, the internal circulation damper is opened to 50% and the fresh air inlet 13 damper is opened to 50%; when the outdoor temperature is between 35℃ and 38℃ and the outdoor humidity is ≥90%, the internal circulation damper is opened to 70% and the fresh air inlet 13 damper is opened to 30%; when the outdoor temperature is ≥38℃ and the outdoor humidity is ≥90%, the internal circulation damper is opened to 100% and the fresh air inlet 13 damper is opened to 0%.

[0056] like Figure 2 As shown, in some embodiments, the fresh air conditioning system further includes a humidification component. The humidification component is disposed within the mixing chamber 102 and is electrically connected to a control element; wherein the control element can control the humidification power of the humidification component according to the outdoor humidity.

[0057] Specifically, a humidifying component is installed inside the mixing chamber 102 to humidify the air within it, and then a fan 31 blows the humidified air from the mixing chamber 102 into the room. The humidity level inside the mixing chamber 102 can be adjusted by controlling the humidification power of the humidifying component. This setup allows for a rapid increase in indoor humidity, resulting in a better user experience.

[0058] like Figure 2 As shown, in some embodiments, the fresh air inlet 13 is provided with a rotatable fresh air valve plate to form a fresh air valve body 22. The fresh air air conditioning system also includes a first motor. The first motor is drivenly connected to the fresh air valve plate to drive the fresh air valve plate to rotate, thereby controlling the opening degree of the fresh air valve plate.

[0059] Specifically, the fresh air inlet 13 is configured as a circular opening, and the size and shape of the fresh air valve plate correspond to the fresh air inlet 13. Rotating shafts are provided on both sides of the fresh air valve plate, and the fresh air valve plate is rotatably mounted at the fresh air inlet 13 via these shafts. A first motor is located on one side of the fresh air valve plate, and the drive shaft of the first motor is connected to the rotating shaft of the fresh air valve plate to drive the fresh air valve plate to rotate around the rotating shaft, thereby controlling the opening degree of the fresh air valve plate. This configuration simplifies the structure of the fresh air valve body 22 and makes it easier for users to disassemble and assemble the fresh air valve body 22.

[0060] like Figure 2 As shown, in some embodiments, the return air duct 103 is provided with a rotatable return air valve plate to form a return air valve body 21. The fresh air air conditioning system also includes a second motor. The second motor is drivenly connected to the return air valve plate to drive the return air valve plate to rotate, thereby controlling the opening degree of the return air valve body 21.

[0061] Specifically, the return air valve plate is located at the connection point between the return air duct 103 and the mixing chamber 102. A rotating shaft is provided on one side of the return air valve plate, and the return air valve plate is rotatably positioned at the connection point via the rotating shaft. A second motor is located on one side of the return air valve plate, and the drive shaft of the second motor is connected to the rotating shaft of the return air valve plate to drive the return air valve plate to rotate around the rotating shaft, thereby controlling the opening degree of the return air valve plate. This configuration simplifies the structure of the return air valve body 21 and makes it easier for users to disassemble and assemble the return air valve body 21.

[0062] like Figure 2 As shown, in some embodiments, the fresh air conditioning system further includes a filter 33. The filter 33 is disposed in the mixing chamber 102, and the filter 33 is located on the side of the heat exchanger 32 near the fresh air inlet 13.

[0063] Specifically, filter 33 is positioned perpendicular to the airflow direction within mixing chamber 102, and its size is the same as the cross-sectional area of ​​mixing chamber 102 to ensure that air flowing towards heat exchanger 32 passes through filter 33 first. With this configuration, when fresh air inlet 13 is open via fresh air valve 22, filter 33 can filter outdoor air to improve the quality of air blown into the room.

[0064] like Figure 2 As shown, in some embodiments, the connection between the return air duct 103 and the mixing chamber 102 is located on the side of the filter 33 near the fresh air inlet 13.

[0065] Specifically, after indoor air flows into the mixing chamber 102 through the return air duct 103, it first passes through the filter 33 before being blown into the room. In this way, when the return air duct 103 is cleared by the return air valve body 21, the filter 33 can filter the indoor air to improve the quality of the air blown into the room.

[0066] like Figure 2 As shown, in some embodiments, the fresh air conditioning system further includes an electric heating device 34. The electric heating device 34 is disposed in the mixing chamber 102.

[0067] Specifically, the electric heating device 34 is located on one side of the heat exchanger 32. Thus, when both the outdoor and indoor temperatures are low, the fresh air conditioning system can use the electric heating device 34 to supplement the heating of the air in the mixing chamber 102, working in conjunction with the heat exchanger 32 to rapidly increase the air temperature within the mixing chamber 102. Then, the fan 31 can blow the hot air from the mixing chamber 102 into the room to quickly raise the indoor temperature.

[0068] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A fresh air conditioning system, characterized by, Comprise: A cabinet, provided with a supply air chamber, a mixing chamber and a return air duct which are communicated in sequence, the supply air chamber is provided with an air outlet communicated with indoor, the mixing chamber is provided with a fresh air outlet communicated with outdoor, and the return air duct is provided with a return air outlet communicated with indoor; A fan is arranged in the supply air chamber, and the air supply direction of the fan is defined as being directed to the air outlet; A heat exchanger is arranged in the mixing chamber; and A return air valve body is arranged in the return air duct, and the return air valve body is used for blocking or dredging the return air duct.

2. The fresh air conditioning system of claim 1, wherein, Further comprise: A fresh air valve body is arranged at the fresh air outlet, and the fresh air valve body is used for blocking or dredging the fresh air outlet.

3. The fresh air conditioning system of claim 2, wherein, Further comprise: A control element is electrically connected with the return air valve body and the fresh air valve body respectively; A temperature sensor is electrically connected with the control element, and the temperature sensor is used for acquiring outdoor temperature; Wherein, the control element can control the opening degree of the return air valve body and the fresh air valve body according to outdoor temperature.

4. The fresh air conditioning system of claim 3, wherein, Further comprise: A humidity sensor is electrically connected with the control element, and the humidity sensor is used for acquiring outdoor humidity; Wherein, the control element can control the opening degree of the return air valve body and the fresh air valve body according to outdoor humidity.

5. The fresh air conditioning system of claim 4, wherein, Further comprise: A humidifying assembly is arranged in the mixing chamber, and the humidifying assembly is electrically connected with the control element; Wherein, the control element can control the humidifying power of the humidifying assembly according to outdoor humidity.

6. The fresh air conditioning system of claim 2, wherein, The fresh air outlet is provided with a rotatable fresh air valve plate to constitute the fresh air valve body; The fresh air air conditioning system further comprises: A first motor is in transmission connection with the fresh air valve plate to drive the fresh air valve plate to rotate, thereby controlling the opening degree of the fresh air valve plate.

7. The fresh air conditioning system of claim 1, wherein, The return air duct is provided with a rotatable return air valve plate to constitute the return air valve body; The fresh air air conditioning system further comprises: A second motor is in transmission connection with the return air valve plate to drive the return air valve plate to rotate, thereby controlling the opening degree of the return air valve body.

8. The fresh air conditioning system according to any one of claims 1 to 7, characterized in that, Further comprise: A filter screen is arranged in the mixing chamber, and the filter screen is located on the side of the heat exchanger close to the fresh air outlet.

9. The fresh air air conditioning system according to claim 8, wherein The communication between the return air duct and the mixing chamber is located on the side of the filter screen close to the fresh air outlet.

10. The fresh air conditioning system according to any one of claims 1 to 7, characterized in that, Further comprise: An electric heating device is arranged in the mixing chamber.

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