Rooftop

Abstract

The utility model relates to the field of heat exchange technology, and in particular to a rooftop unit. The rooftop unit includes a casing, a heat exchanger and an evaporator. The casing is provided with an air inlet, an air outlet, a return air outlet and an air supply outlet. The air inlet and the air outlet are both connected to the outdoor environment, and the return air outlet and the air supply outlet are both connected to the indoor environment. The heat exchanger is located in the casing, and the heat exchanger is constructed with a first heat exchange chamber and a second heat exchange chamber that can exchange heat with each other. One end of the first heat exchange chamber is connected to the air inlet, and the other end is connected to the air supply outlet. One end of the second heat exchange chamber is connected to the return air outlet, and the other end is connected to the air outlet. The evaporator is installed in the casing and is located between the first heat exchange chamber and the air supply outlet. The advantage is that the fresh air and the return air can exchange heat at the heat exchanger, so that the temperature of the overheated or overcooled fresh air is closer to the temperature of the indoor environment, and the temperature adjustment is achieved without the help of the air conditioning system, thereby reducing the energy consumption of the rooftop unit.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a rooftop machine. Background Art

[0002] Rooftop units are used in indoor areas with high requirements on temperature and air quality. They are used to ventilate indoor air, introduce fresh air from the outdoor environment, and discharge turbid indoor air to the outside.

[0003] Since existing rooftop units need to cool down (or heat up) the air introduced into the room, a heat exchanger is usually installed in the casing. The fresh air entering the room and the return air (turbid air) blown from the room to the outside are heat exchanged in the heat exchanger, so that the temperature of the fresh air entering the room is close to the required temperature. However, this method has a poor heat exchange effect on the fresh air, and the temperature of the fresh air entering the room may not meet the requirements of the indoor environment. Utility Model Content

[0004] Based on this, the utility model provides a rooftop machine to solve the above technical problems.

[0005] A rooftop unit comprises: a casing, the casing is provided with an air inlet, an air outlet, a return air outlet and an air supply outlet, the air inlet and the air outlet are both connected to the outdoor environment, and the return air outlet and the air supply outlet are both connected to the indoor environment; the air inlet is not directly connected to the air outlet, and the return air outlet is not directly connected to the air supply outlet; a heat exchanger, the heat exchanger is located in the casing, and the heat exchanger is constructed with a first heat exchange chamber and a second heat exchange chamber that can exchange heat with each other, one end of the first heat exchange chamber is connected to the air inlet, and the other end is connected to the air supply outlet, one end of the second heat exchange chamber is connected to the return air outlet, and the other end is connected to the air outlet; an evaporator is installed in the casing and is located between the return air outlet and the air supply outlet.

[0006] In this arrangement, the air inlet is connected to the first heat exchange chamber, and the air inlet is connected to the outdoor environment, so the outdoor fresh air enters the first heat exchange chamber through the air inlet, the return air outlet is connected to the second heat exchange chamber, and the return air outlet is connected to the indoor environment, so the return air in the indoor environment can enter the second heat exchange chamber through the return air outlet, and because the first heat exchange chamber and the second heat exchange chamber can exchange heat with each other, the fresh air in the first heat exchange chamber can exchange heat with the return air in the second heat exchange chamber. When the temperature of the fresh air in the outdoor environment in summer is higher than the return air in the indoor environment, the return air can reduce the temperature of the fresh air, and when the temperature of the fresh air in the outdoor environment in winter is lower than the return air in the indoor environment, the return air can increase the temperature of the fresh air. Therefore, the heat exchanger can heat the fresh air without the aid of high-power-consuming components such as evaporators, condensers, and compressors, with low power consumption and energy saving. After the heat exchange is completed, the fresh air can flow into the indoor environment through the air supply port, and the return air can flow to the outdoor environment through the air outlet, thereby completing the indoor ventilation action. In addition, an evaporator is installed in the casing. When the temperature requirement of the indoor environment is relatively low and the single element of the heat exchanger cannot meet the cooling requirement, the evaporator is started. Since it is located between the first heat exchange chamber and the air supply outlet, the fresh air needs to flow through the evaporator after passing through the first heat exchange chamber and then flow to the air supply outlet, and exchange heat with the heat exchange medium in the evaporator. The evaporator further reduces the temperature of the fresh air.

[0007] In one embodiment, a heat insulation board is provided in the casing, the heat insulation board is connected to the inner wall of the casing, and divides the space in the casing into an evaporation zone and a condensation zone along the length direction of the casing, the evaporator, the air supply port, and the return air port are located in the evaporation zone, and a condenser assembly is provided in the condensation zone.

[0008] In one embodiment, the condenser assembly includes a plurality of condensing fans and a condenser, wherein the condenser is connected to the evaporator, and a condensing air duct is configured in the condensing fan, and the condensing air duct connects the condensing area and the outdoor environment.

[0009] In one embodiment, the heat exchanger is located in the evaporation zone, the return air outlet is located between the evaporator and the heat exchanger, and a partition plate is provided in the evaporation zone, the heat exchanger is connected to the inner wall of the casing, one side of the partition plate is connected to the heat exchanger, and the other side is connected to the inner wall of the casing, the heat exchanger, the partition plate and the inner wall of the casing cooperate to form an air inlet cavity and an air outlet cavity, the air inlet cavity is not connected to the air outlet cavity, the air inlet is opened on the side wall of the casing forming the air inlet cavity and is connected to the air inlet cavity, and the air outlet is opened on the side wall of the casing forming the air outlet cavity and is connected to the air outlet cavity.

[0010] In one embodiment, an exhaust fan is installed in the air outlet cavity, the air inlet and the air outlet are opened on the same side of the casing, and the air return port and the air supply port are opened on the other side of the casing.

[0011] In one embodiment, the rooftop machine also includes a carbon dioxide detector, which is electrically connected to the exhaust fan and configured to control the operation of the exhaust fan based on whether a preset value is triggered. The carbon dioxide detector is connected to the casing and is at least partially located on the outside of the casing.

[0012] In one embodiment, a filter is further provided in the evaporation zone, and the filter is located between the return air port and the supply air port, and along the length direction of the casing, the filter is arranged closer to the return air port than the evaporator.

[0013] In one embodiment, the first heat exchange chamber includes an air inlet duct connected to the air inlet, and the second heat exchange chamber includes a return air duct connected to the return air outlet, and the air inlet duct and the return air duct are perpendicular to each other.

[0014] In one of the embodiments, an air supply fan is also installed in the casing, and the air supply fan is arranged close to the air supply port.

[0015] In one embodiment, the heat exchanger is configured as a total heat exchanger or a sensible heat exchanger.

[0016] Compared with the prior art, the utility model uses a heat exchanger to allow the fresh air entering from the outdoor environment to exchange heat with the return air flowing to the outside of the indoor environment, so that the temperature of the overheated or overcooled fresh air entering from the room is closer to the temperature of the indoor environment, that is, closer to the required temperature of the indoor environment. Temperature regulation can be achieved without the aid of an air-conditioning system, reducing the energy consumption of the rooftop unit. When the heat exchanger cannot meet the requirements, the temperature of the fresh air can be further regulated by the evaporator, and the fresh air particles can be filtered through the filter to ensure that the temperature, cleanliness and quality of the fresh air entering the indoor environment meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of one embodiment of the rooftop machine provided by the utility model;

[0018] Figure 2 A schematic top view of one embodiment of a rooftop machine provided by the utility model;

[0019] Figure 3 This is a side view of one embodiment of the rooftop machine provided by the utility model.

[0020] The symbols in the figure mean the following:

[0021] 100. Rooftop unit; 10. Casing; 11. Air supply outlet; 12. Return air outlet; 13. Evaporation zone; 131. Partition plate; 132. Air inlet chamber; 133. Air outlet chamber; 14. Condensation zone; 15. Heat insulation board; 16. Rain cover; 17. Air inlet; 18. Air outlet; 20. Heat exchanger; 21. First heat exchange chamber; 22. Second heat exchange chamber; 30. Evaporator; 40. Condenser assembly; 41. Condenser; 42. Condensing fan; 50. Exhaust fan; 60. Filter; 70. Air supply fan; 80. Fan inspection door; 90. Filter inspection door. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it may be directly on the other mechanism or there may be a central mechanism. When a mechanism is considered to be "connected to" another mechanism, it may be directly connected to the other mechanism or there may be a central mechanism at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0027] See also Figure 1-Figure 3 The utility model provides a rooftop unit 100, which can allow the return air of the indoor environment to exchange heat with the fresh air of the outdoor environment through the heat exchanger 20, so as to achieve cooling or heating of the fresh air of the outdoor environment with low power consumption, and can also further cool the fresh air through the evaporator 30 to meet the requirements of the indoor environment.

[0028] The rooftop unit 100 includes a casing 10, a heat exchanger 20 and an evaporator 30. The casing 10 is provided with an air inlet 17, an air outlet 18, a return air outlet 12 and an air supply outlet 11. The air inlet 17 and the air outlet 18 are both connected to the outdoor environment, the return air outlet 12 and the air supply outlet 11 are both connected to the indoor environment, the air inlet 17 is not directly connected to the air outlet 18, and the return air outlet 12 is not directly connected to the air supply outlet 11. The heat exchanger 20 is located in the casing 10, and a first heat exchange chamber 21 and a second heat exchange chamber 22 that can exchange heat with each other are constructed in the heat exchanger 20. One end of the first heat exchange chamber 21 is connected to the air inlet 17, and the other end is connected to the air supply outlet 11. One end of the second heat exchange chamber 22 is connected to the return air outlet 12, and the other end is connected to the air outlet 18; the evaporator 30 is installed in the casing 10 and is located between the return air outlet 12 and the air supply outlet 11.

[0029] In this way, the air inlet 17 is connected to the first heat exchange chamber 21, and the air inlet 17 is connected to the outdoor environment, so the outdoor fresh air enters the first heat exchange chamber 21 through the air inlet 17, and the return air inlet 12 is connected to the second heat exchange chamber 22, and the return air inlet 12 is connected to the indoor environment, so the return air in the indoor environment can enter the second heat exchange chamber 22 through the return air inlet 12, and because the first heat exchange chamber 21 and the second heat exchange chamber 22 can exchange heat with each other, the fresh air in the first heat exchange chamber 21 can exchange heat with the return air in the second heat exchange chamber 22, when the temperature of the fresh air in the outdoor environment in summer is higher than the return air in the indoor environment, the return air can reduce the temperature of the fresh air, and when the temperature of the fresh air in the outdoor environment in winter is lower than the return air in the indoor environment, the return air can increase the temperature of the fresh air. Therefore, the heat exchanger 20 can heat the fresh air without the aid of high-power-consuming components such as the evaporator 30, the condenser 41 and the compressor, and the power consumption is low, saving energy. After the heat exchange is completed, the fresh air can flow into the indoor environment through the air supply port 11, and the return air can flow to the outdoor environment through the air outlet 18, thereby completing the indoor ventilation action. In addition, an evaporator 30 is also installed in the housing 10. When the temperature requirement of the indoor environment is relatively low and the heat exchanger 20 alone cannot meet the cooling requirement, the evaporator 30 is started. Since it is located between the first heat exchange chamber 21 and the air supply port 11, the fresh air needs to flow through the evaporator 30 after passing through the first heat exchange chamber 21 and then flow to the air supply port 11, and exchange heat with the heat exchange medium in the evaporator 30, and the evaporator 30 further reduces the temperature of the fresh air.

[0030] After the heat exchange medium flows through the evaporator 30, it needs to flow to the condenser 41 to release heat. Therefore, a condenser assembly 40 is provided in the casing 10. In order to install the condenser assembly 40 and prevent the condenser assembly 40 from affecting the fresh air temperature when releasing heat during operation, the present embodiment provides a heat insulation board 15 in the casing 10. The heat insulation board 15 is connected to the inner wall of the casing 10, and the space in the casing 10 is divided into an evaporation zone 13 and a condensation zone 14 along the length direction of the casing 10. The evaporator 30, the air supply port 11 and the return air port 12 are all located in the evaporation zone 13, and the condenser assembly 40 is located in the condensation zone 14. The two areas are separated by the heat insulation board 15 to avoid the temperature between the two areas affecting each other.

[0031] The condenser assembly 40 includes multiple condensing fans 42 and a condenser 41. The condenser 41 is connected to the evaporator 30 for the circulation of heat exchange medium. A condensing air duct is constructed in the condensing fan 42, and the condensing air duct connects the condensing area 14 and the outdoor environment. Therefore, when the condensing fan 42 is working, it can blow the temperature generated by the condenser 41 to the outdoor environment through the condensing air duct as quickly as possible to complete the heat dissipation work.

[0032] In this embodiment, there are four condensing fans 42, and they are arranged in an array of two to provide a uniform heat dissipation effect. In other embodiments, the condensing fans 42 can be set to two or three, etc. according to the working conditions, and are not limited to the above four arrays.

[0033] The evaporator 30 and the heat exchanger 20 are both installed in the evaporation area 13, the return air port 12 is located between the evaporator 30 and the heat exchanger 20, and a partition plate 131 is provided in the evaporation area 13, the heat exchanger 20 is connected to the inner wall of the casing 10, one side of the partition plate 131 is connected to the heat exchanger 20, and the other side is connected to the inner wall of the casing 10, the heat exchanger 20, the partition plate 131 and the inner wall of the casing 10 cooperate to form an air inlet chamber 132 and an air outlet chamber 133, the air inlet chamber 132 and the air outlet chamber 133 are not connected, the air inlet 17 is opened on the side wall of the casing 10 forming the air inlet chamber 132 and is connected to the air inlet chamber 132, and the air outlet 18 is opened on the side wall of the casing 10 forming the air outlet chamber 133 and is connected to the air outlet chamber 133. In this way, the spaces in the air inlet cavity 132 and the air outlet cavity 133 become two separate spaces through the partition plate 131 to avoid mutual influence, and the communication with the heat exchanger 20 is more direct without the need for additional air ducts.

[0034] Furthermore, an exhaust fan 50 is installed in the air outlet cavity 133, and the exhaust fan 50 drives ventilation to accelerate the air flow between the indoor environment and the outdoor environment. The air inlet 17 and the air outlet 18 are opened on the same side of the housing 10, and the return air port 12 and the air supply port 11 are opened on the other side of the housing 10 to facilitate the connection with the external pipeline and the layout of the internal pipeline.

[0035] Furthermore, the rooftop unit 100 further includes a carbon dioxide detector, which is electrically connected to the exhaust fan 50 and is configured to control the exhaust fan 50 to work according to whether a preset value is triggered. In this way, the carbon dioxide detector can detect the indoor carbon dioxide concentration in real time, and intelligently determine whether to turn on the exhaust fan 50 according to the carbon dioxide concentration. When the carbon dioxide concentration reaches the preset value (the carbon dioxide concentration is too high), the exhaust fan 50 is turned on and the rooftop unit 100 starts to operate. When the indoor air does not need to be ventilated, the rooftop unit 100 does not work to save energy.

[0036] The carbon dioxide detector is connected to the housing 10 and is at least partially located outside the housing 10 to detect the carbon dioxide concentration in the room.

[0037] It is understandable that in other embodiments, the carbon dioxide detector may also be other intelligent detection devices, such as a PM2.5 detector to detect the turbidity of indoor air, and when the floating particles in the air reach a pre-examination value, the rooftop unit 100 is turned on for ventilation.

[0038] A filter 60 is also provided in the evaporation area 13, and the filter 60 is located between the heat exchanger 20 and the air outlet 11. In this way, the fresh air entering from the first heat exchange chamber 21 in the heat exchanger 20 will inevitably pass through the filter 60, and then enter the indoor environment through the air outlet 11. The filter 60 can filter the particles in the fresh air, ensuring that the air quality and cleanliness of the fresh air entering the indoor environment meet the requirements.

[0039] The first heat exchange chamber 21 includes an air inlet duct connected to the air inlet 17, and the second heat exchange chamber 22 includes a return air duct connected to the return air outlet 12. The air inlet duct and the return air duct are perpendicular to each other. In this way, the air inlet duct and the return air duct form a positively intersecting heat exchange airflow, and the heat exchange efficiency is higher.

[0040] Since the first heat exchange chamber 21 and the second heat exchange chamber 22 are divided by the airflow partition plate 131, there is a temperature difference and a water vapor partial pressure difference between the fresh air in the first heat exchange chamber 21 and the return air in the second heat exchange chamber 22. When these two airflows pass through the partition plate 131, heat and mass transfer phenomena will occur, thereby realizing a full heat exchange process. In summer, in addition to being able to obtain cold air from the return air in this way and lower its own temperature, the return air will also take away moisture in the fresh air and reduce its moisture content. On the contrary, in winter, the fresh air can obtain heat from the return air, thereby raising its own temperature, and the return air will increase the humidity of the fresh air.

[0041] An air supply fan 70 is also installed in the housing 10 . The air supply fan 70 is arranged close to the air supply port 11 . The air supply fan 70 forces the fresh air in the housing 10 to flow out from the air supply port 11 .

[0042] In addition, the heat exchanger 20 is configured as a total heat exchanger or a sensible heat exchanger. The total heat exchanger can not only achieve the effect of heat exchange, but also has the non-porous film paper inside. This material has the characteristics of small thickness, high moisture permeability, good air tightness, tear resistance, aging resistance, etc. The gaps between its fibers are very small, and only water vapor molecules with smaller diameters can pass through, while other harmful gases with larger diameters cannot pass through. This can not only exchange temperature or humidity well, but also avoid pollutants from penetrating into the fresh air. In other embodiments, the heat exchanger 20 can also use a sensible heat exchanger. The internal material of the sensible heat exchanger is generally pure aluminum foil, which has fast heat transfer, good effect, long service life, and is relatively durable.

[0043] The housing 10 is also provided with a fan inspection door 80 and a filter 60 inspection door. The fan inspection door 80 is correspondingly provided on the housing 10 outside the condensation area 14, and the filter 60 inspection door is correspondingly provided outside the filter 60 in the evaporation area 13, so as to facilitate the staff to disassemble and inspect the filter 60 and the condensation fan 42. A rain cover 16 is provided on the outer side of the air inlet 17 to prevent rainwater from entering the rooftop unit 100 when the outdoor environment is in rainy weather.

[0044] Compared with the prior art, the utility model uses the heat exchanger 20 to allow the fresh air entering from the outdoor environment to exchange heat with the return air flowing to the outside of the indoor environment, so that the temperature of the overheated or overcooled fresh air entering from the room is closer to the temperature of the indoor environment, that is, closer to the required temperature of the indoor environment. Temperature regulation is achieved without the aid of an air-conditioning system, thereby reducing the energy consumption of the rooftop unit 100. When the heat exchanger 20 cannot meet the requirements, the temperature of the fresh air can be further regulated through the evaporator 30, and the fresh air particles can be filtered through the filter 60, thereby ensuring that the temperature, cleanliness and quality of the fresh air entering the indoor environment meet the requirements.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A rooftop unit, characterized in that: include: A casing (10), wherein the casing (10) is provided with an air inlet (17), an air outlet (18), a return air outlet (12) and an air supply outlet (11); the air inlet (17) and the air outlet (18) are both connected to the outdoor environment, and the return air outlet (12) and the air supply outlet (11) are both connected to the indoor environment; the air inlet (17) is not directly connected to the air outlet (18), and the return air outlet (12) is not directly connected to the air supply outlet (11); a heat exchanger (20), the heat exchanger (20) being located in the casing (10), and the heat exchanger (20) being configured with a first heat exchange chamber (21) and a second heat exchange chamber (22) capable of exchanging heat with each other, one end of the first heat exchange chamber (21) being connected to the air inlet (17), and the other end being connected to the air supply port (11), and one end of the second heat exchange chamber (22) being connected to the air return port (12), and the other end being connected to the air outlet (18); The evaporator (30) is installed in the casing (10) and is located between the return air port (12) and the supply air port (11).

2. The rooftop machine according to claim 1, characterized in that: A heat insulation board (15) is provided in the casing (10), the heat insulation board (15) is connected to the inner wall of the casing (10), and divides the space in the casing (10) into an evaporation zone (13) and a condensation zone (14) along the length direction of the casing (10); the evaporator (30), the air supply port (11), and the return air port (12) are located in the evaporation zone (13), and a condenser assembly (40) is provided in the condensation zone (14).

3. The rooftop machine according to claim 2, characterized in that: The condenser assembly (40) includes a plurality of condensing fans (42) and a condenser (41), wherein the condenser (41) is connected to the evaporator (30), and a condensing air duct is constructed in the condensing fan (42), and the condensing air duct is connected to the condensing area (14) and the outdoor environment.

4. The rooftop machine according to claim 2 or 3, characterized in that: The heat exchanger (20) is located in the evaporation zone (13), the return air port (12) is located between the evaporator (30) and the heat exchanger (20), and a partition plate (131) is provided in the evaporation zone (13), the heat exchanger (20) is connected to the inner wall of the casing (10), one side of the partition plate (131) is connected to the heat exchanger (20), and the other side is connected to the inner wall of the casing (10), the heat exchanger (20) and the partition plate (131) and the inner wall of the casing (10) cooperate to form an air inlet chamber (132) and an air outlet chamber (133); the air inlet chamber (132) is not connected to the air outlet chamber (133); the air inlet port (17) is opened on the side wall of the casing (10) forming the air inlet chamber (132) and is connected to the air inlet chamber (132); the air outlet port (18) is opened on the side wall of the casing (10) forming the air outlet chamber (133) and is connected to the air outlet chamber (133).

5. The rooftop machine according to claim 4, characterized in that: An exhaust fan (50) is installed in the air outlet cavity (133); the air inlet (17) and the air outlet (18) are opened on the same side of the casing (10); and the air return port (12) and the air supply port (11) are opened on the other side of the casing (10).

6. The rooftop machine according to claim 5, characterized in that: The rooftop machine further comprises a carbon dioxide detector, which is electrically connected to the exhaust fan (50) and is configured to control the operation of the exhaust fan (50) according to whether a preset value is triggered, and the carbon dioxide detector is connected to the casing (10) and is at least partially located outside the casing (10).

7. The rooftop machine according to claim 4, characterized in that: A filter screen (60) is also provided in the evaporation zone (13). The filter screen (60) is located between the return air port (12) and the supply air port (11), and along the length direction of the casing (10), the filter screen (60) is arranged closer to the return air port (12) than the evaporator (30).

8. The rooftop machine according to claim 1, characterized in that: The first heat exchange chamber (21) comprises an air inlet duct connected to the air inlet (17), and the second heat exchange chamber (22) comprises a return air duct connected to the return air outlet (12), and the air inlet duct and the return air duct are perpendicular to each other.

9. The rooftop machine according to claim 1, characterized in that: An air supply fan (70) is also installed in the housing (10), and the air supply fan (70) is arranged close to the air supply port (11).

10. The rooftop machine according to claim 1, characterized in that: The heat exchanger (20) is configured as a total heat exchanger or a sensible heat exchanger.

Images