Air handling unit

Abstract

The invention discloses an air handling unit, and relates to the technical field of air conditioning equipment, the air handling unit comprises a box body, a fan, a heat exchanger, a front panel and a refrigerant sensor, the fan is arranged in the box body, the heat exchanger is arranged in the box body and is located below the fan, and the front panel is detachably connected with the peripheral wall of the box body and covers a mounting opening of the peripheral wall. The refrigerant sensor is installed in the box body and can be exposed out of the installation opening after the front panel is detached. When the refrigerant of the heat exchanger leaks, the refrigerant can be diffused to other positions of the box body after being accumulated to a certain concentration, and the refrigerant sensor can detect leakage of the refrigerant and give an alarm due to the fact that the refrigerant sensor is located in the box body. Due to the fact that the refrigerant sensor can be exposed out of the installation opening after the front panel is detached, the refrigerant sensor can be conveniently detached, and maintenance efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and in particular to an air handling unit. Background Technology

[0002] In related technologies, the refrigerant used in air conditioners is flammable, therefore refrigerant detection sensors need to be installed at potential leak points within the heat exchanger. In some wall-mounted air handling units, because the heat exchanger is located at the bottom and the refrigerant's density is greater than air's, the refrigerant sensor is typically placed at the bottom of the air conditioner, near the lower part of the heat exchanger. However, placing the refrigerant sensor at the bottom of the air conditioner makes its maintenance difficult. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an air handling unit that allows for easy disassembly and assembly of the refrigerant sensor, thereby improving maintenance efficiency.

[0004] An air handling unit according to a first aspect of the present invention includes: a housing, including a peripheral wall, the peripheral wall being provided with an installation opening; The fan is installed inside the housing; A heat exchanger is installed inside the housing and located below the fan; The front panel is detachably connected to the peripheral wall and covers the mounting port; A refrigerant sensor is installed inside the enclosure and configured to be visible through the mounting port when the front panel is removed.

[0005] The air handling unit according to embodiments of the present invention has at least the following beneficial effects: The fan is installed inside the enclosure, and the heat exchanger is installed inside the enclosure, located below the fan. The front panel and the enclosure's peripheral walls are detachably connected, covering the mounting openings on the peripheral walls. The refrigerant sensor is installed inside the enclosure and is exposed at the mounting opening after the front panel is removed. When the heat exchanger leaks refrigerant, the refrigerant accumulates to a certain concentration and diffuses to other parts of the enclosure. Because the refrigerant sensor is located inside the enclosure, it can detect the leak and trigger an alarm. The sensor is easily accessible after removing the front panel, improving maintenance efficiency.

[0006] According to some embodiments of the present invention, the housing further includes a crossbeam, which is fixedly connected to the middle of the housing.

[0007] According to some embodiments of the present invention, the peripheral wall is further provided with an air inlet, the air inlet being located below the mounting port, and the crossbeam being fixedly connected to the front end of the peripheral wall and located between the air inlet and the mounting port.

[0008] According to some embodiments of the present invention, the housing further includes a bottom wall connected to the peripheral wall, one end of the heat exchanger is connected to the crossbeam, and the other end of the heat exchanger is connected to the bottom wall; along the vertical direction, the refrigerant sensor is located on the side of the heat exchanger near the mounting port.

[0009] According to some embodiments of the present invention, the heat exchanger is configured to be inclined downward in a front-to-back direction, and the refrigerant sensor is located on the extension line of the upper end face of the heat exchanger.

[0010] According to some embodiments of the present invention, the side plate of the heat exchanger near the crossbeam is sealed to the crossbeam to isolate the mounting port and the air inlet.

[0011] According to some embodiments of the present invention, the crossbeam is connected to one side wall of the peripheral wall.

[0012] According to some embodiments of the present invention, the refrigerant sensor is mounted on the crossbeam.

[0013] According to some embodiments of the present invention, the air handling unit further includes a bracket, the refrigerant sensor being mounted on the crossbeam via the bracket, the bracket including a shielding portion located above the refrigerant sensor.

[0014] According to some embodiments of the present invention, the peripheral wall includes a left side wall and a right side wall arranged opposite to each other, the fan includes a volute, the air outlet of the volute is located on the side near the right side wall along the left-right direction, and the refrigerant sensor is located on the side near the right side wall.

[0015] According to some embodiments of the present invention, the orthographic projection of the fan and the orthographic projection of the refrigerant sensor are arranged in a staggered manner on the front-to-back projection plane.

[0016] According to some embodiments of the present invention, the peripheral wall is further provided with an air inlet, the air inlet being located below the mounting port, and the air handling unit further includes a filter assembly, the filter assembly being installed on the side of the heat exchanger facing the air inlet.

[0017] According to some embodiments of the present invention, the filtration assembly includes a high-efficiency filter that is detachably connected to the housing.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of an air handling unit according to an embodiment of the present invention; Figure 2 This is an exploded schematic diagram of an air handling unit according to an embodiment of the present invention; Figure 3 This is a front view of an air handling unit according to an embodiment of the present invention with the front panel hidden. Figure 4 for Figure 3 Sectional view at point AA; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the structure of an air handling unit after concealing the front panel and fan, according to another embodiment of the present invention. Figure 7 for Figure 6 A front view of the air handling unit in the middle; Figure 8 for Figure 4 Enlarged view of point C in the middle.

[0020] Icon labels: 1000 air handling units; 100 for the enclosure; 110 for the peripheral wall; 111 for the mounting port; 112 for the left side wall; 113 for the right side wall; 114 for the rear side wall; 120 for the front panel; 130 for the crossbeam; 140 for the air inlet; 150 for the bottom wall; 160 for the disassembly / removal port. Fan 200; volute 210; air outlet 220; air inlet 230; Heat exchanger 300; filter assembly 310; filter screen 311; side plate 320; Refrigerant sensor 400; bracket 410; shield 411; piping assembly 420; Water tray 500; water outlet connector 510; water inlet 520; baffle 530. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or the order in which the indicated technical features are presented.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] Air handling units, also known as ducted air conditioners, are typically installed in attics or basements. They can be assembled from multiple modular units, such as a heat exchange unit and a fan unit. Alternatively, they can be a single, integrated design, where the heat exchange and fan components are housed within the same enclosure. Air handling units can be wall-mounted, meaning their rear is fixed to one side of the wall via a mounting bracket, thus limiting airflow to the rear. Alternatively, they can be floor-standing and directly fixed to the ground.

[0026] To clearly illustrate the technical solutions of the embodiments of the present invention, a wall-mounted air handling unit will be used as an example below. (Refer to...) Figure 1 and Figure 2As shown, an air handling unit 1000 according to an embodiment of the present invention includes a housing 100, a fan 200, a heat exchanger 300, a front panel 120, and a refrigerant sensor 400. The housing 100 includes a peripheral wall 110, and the peripheral wall 110 is provided with a mounting opening 111. For example, the housing 100 is square, and the peripheral wall 110 includes a left side wall 112, a right side wall 113, and a rear side wall 114. The left side wall 112, the rear side wall 114, and the right side wall 113 are connected sequentially along the circumference of the housing 100, and adjacent side walls are set at 90°, so that a mounting opening 111 can be formed on the front side of the peripheral wall 110. Alternatively, the peripheral wall 110 may also include a left side wall 112, a right side wall 113, a rear side wall 114, and a front side wall connected sequentially along the circumference of the housing 100, and a mounting opening 111 is provided on the front side wall. The mounting opening 111 is square, which maximizes the exposure of the internal structure of the enclosure 100, facilitating inspection and cleaning. In another embodiment, the enclosure 100 may also be cylindrical, elliptical, or other shapes. For ease of explanation, the following description will use a square enclosure 100 as an example.

[0027] A fan 200 is installed inside the housing 100. The fan 200 can be a centrifugal fan and is fixedly connected to the housing 100. A heat exchanger 300 is installed inside the housing 100 and located below the fan 200. The heat exchanger 300 can be an evaporator or a condenser. For example, when the air handling unit 1000 is cooling, the heat exchanger 300 is used as an evaporator; when the air handling unit 1000 is heating, the heat exchanger 300 is used as a condenser. The front panel 120 is detachably connected to the peripheral wall 110 and covers the mounting port 111. The detachable connection can be a fastener connection such as screws or bolts, or a snap-fit ​​connection, such as a clip on the front panel 120 and a groove on the peripheral wall 110 that mates with the clip. The refrigerant sensor 400 is installed inside the housing 100 and is configured so that the refrigerant sensor 400 can be exposed in the mounting port 111 after the front panel 120 is removed. It should be noted that, referring to... Figure 3 As shown, the fact that the refrigerant sensor 400 can be exposed in the mounting port 111 means that after the front panel 120 is opened, at least a portion of the structure of the refrigerant sensor 400 is exposed in the mounting port 111 on the projection surface from front to back.

[0028] Understandably, referring to Figure 4As shown, by adopting the above scheme, when the fan 200 is working, it drives the airflow through the heat exchanger 300 and finally enters the fan 200 to be blown out. When the refrigerant in the heat exchanger 300 leaks, the refrigerant accumulates to a certain concentration and then diffuses to other locations in the housing 100. Since the refrigerant sensor 400 is located inside the housing 100, it can detect the refrigerant leak and trigger an alarm. Because the refrigerant sensor 400 will be exposed at the mounting port 111 after removing the front panel 120, it is convenient to remove and install the refrigerant sensor 400, improving maintenance efficiency.

[0029] Reference Figure 2 As shown in the embodiment of the present invention, the housing 100 further includes a crossbeam 130, which is a long strip plate and is fixedly connected to the middle of the housing 100. The fixed connection can be achieved by welding, bolts, screws, or other fasteners, or by snap-fitting. The crossbeam 130 can increase the overall structural stability of the housing 100, and the refrigerant sensor 400 can also be mounted on the crossbeam 130 for easy maintenance or replacement by maintenance personnel. Since the crossbeam 130 is located in the middle of the housing 100, and the electronic control components of the air handling unit 1000 are located in the upper part of the housing 100, the wiring distance between the refrigerant sensor 400 and the electronic control components is shorter, which can save costs.

[0030] It should be noted that the fixed connection of the crossbeam 130 to the middle of the box 100 should be understood as follows: the space in the middle of the box 100, divided into three equal parts along the height direction from the top to the bottom of the box 100, is the middle part of the box 100. The crossbeam 130 only needs to have at least a portion of its structure connected to the middle of the box 100; that is, the crossbeam 130 can have a portion of its structure connected to the middle of the box 100 and another portion connected to the bottom of the box 100; or a portion of its structure connected to the middle of the box 100 and another portion connected to the top of the box 100; or the crossbeam 130 can only be connected to the middle of the box 100 and has no connection to the top or bottom of the box 100.

[0031] As an alternative embodiment, the refrigerant sensor 400 may not be connected to the crossbeam 130, but rather to the inner wall of the housing 100. For example, the refrigerant sensor 400 may be directly connected to the left side wall 112 or the right side wall 113 of the housing 100, depending on the specific circumstances.

[0032] Reference Figure 2As shown, in this embodiment of the invention, the peripheral wall 110 is further provided with an air inlet 140, which is located below the mounting port 111. Since the air handling unit is a wall-mounted structure, the air inlet 140 is located on the front side of the housing 100. A crossbeam 130 is fixedly connected to the front end of the peripheral wall 110, and the crossbeam 130 is located between the air inlet 140 and the mounting port 111; therefore, the refrigerant sensor 400 has little impact on the air intake of the fan 200. The air inlet 140 is located below the mounting port 111, see reference... Figure 4 As shown, under the action of the fan 200, the airflow enters from the air inlet 140, passes through the heat exchanger 300, and finally enters the interior of the fan 200 through the air intake 230, before being blown out of the housing 100. The fan 200 can be a double-intake structure, meaning that air intakes 230 are provided on both the front and rear sides of the fan 200. The front air intake 230 faces the front panel 120, and the rear air intake 230 faces the rear side wall 114. Therefore, airflow can enter the interior of the fan 200 from both the front and rear sides. Simultaneously, since the refrigerant sensor 400 is located relatively close to the mounting port 111, it can be easily removed and installed after disassembling the front panel 120, improving maintenance efficiency.

[0033] Reference Figure 3 and Figure 4 As shown, in this embodiment of the invention, the housing 100 further includes a bottom wall 150, which is fixedly connected to the lower end of the peripheral wall 110. One end of the heat exchanger 300 is connected to the crossbeam 130, and the other end of the heat exchanger 300 is connected to the bottom wall 150 to limit the relative position of the heat exchanger 300 and the housing 100, preventing the heat exchanger 300 from shaking, tilting, or causing other adverse effects. Along the vertical direction, the refrigerant sensor 400 is located on the side of the heat exchanger 300 near the mounting port 111. Therefore, when refrigerant leaks inside the heat exchanger 300, it can be detected more quickly by the refrigerant sensor 400, thereby rapidly issuing an alarm and improving the operational safety of the air handling unit 1000.

[0034] Reference Figure 4 As shown, in an embodiment of the present invention, the heat exchanger 300 is configured to be inclined downwards in a front-to-back direction. For example, one end of the heat exchanger 300 is connected to the crossbeam 130 located at the front end of the peripheral wall 110, and the other end of the heat exchanger 300 is connected to the rear end of the bottom wall 150, making the heat exchanger 300 inclined, which can increase the area of ​​the heat exchanger 300 and improve the heat exchange efficiency. The refrigerant sensor 400 is located on the extension line S of the upper end face of the heat exchanger 300, that is, the extension line S of the upper end face of the heat exchanger 300 passes through the refrigerant sensor 400. For example Figure 4The dashed line in the diagram represents the extension line S. It can be understood that the heat exchanger 300 is inclined, thus it also acts as a flow guide, allowing the refrigerant to flow along its upper surface to the refrigerant sensor 400. Simultaneously, the refrigerant sensor 400 is located on the extension line S of the upper surface of the heat exchanger 300, enabling it to more effectively detect refrigerant leaks from the heat exchanger 300 and further improve detection efficiency.

[0035] Reference Figure 4 As shown in the embodiment of the present invention, the air handling unit 1000 further includes a filter assembly 310, which is installed on the side of the heat exchanger 300 facing the air inlet 140, i.e., the filter assembly 310 is located at the lower end of the heat exchanger 300. The filter assembly 310 can block foreign objects and purify the air. The filter assembly 310 can effectively prevent foreign objects such as dust, hair, and insects in the air from entering the fan 200, avoiding the accumulation of dust and hair on the surface of the heat exchanger 300, which would reduce heat exchange efficiency. At the same time, it can also reduce dust pollution and wear on the fan 200, thereby extending the service life of the air handling unit 1000. In addition, the air filtered by the filter assembly 310 is cleaner, which can reduce bacterial growth and is beneficial to the user's physical and mental health.

[0036] Reference Figure 3 and Figure 4 As shown in the embodiment of the present invention, the filter assembly 310 includes a filter screen 311 detachably connected to the housing 100. The detachable connection can be a pull-out design. A disassembly port 160 is provided below the crossbeam 130. The filter screen 311 is inserted into the housing 100 through the disassembly port 160 and is inclined, with the inclination direction being the same as the inclination direction of the heat exchanger 300. The lower end of the filter screen 311 is limited by the water receiving tray 500 on the bottom wall 150, while the upper end of the filter screen 311 can protrude from the disassembly port 160. When it is necessary to replace or clean the filter screen, it can be directly pulled out, making the operation simple and convenient.

[0037] In embodiments of the present invention, the filter screen 311 can be a high-efficiency filter (HEPA filter). HEPA filters are made of high-quality filter media such as ultra-fine glass fiber paper and have extremely high filtration efficiency. HEPA filters can effectively capture tiny particles in the air, such as dust, pollen, bacteria, and viruses. For particles of 0.3 micrometers and larger, the filtration efficiency can reach over 99.97%. Simultaneously, the design of the HEPA filter focuses on reducing airflow resistance to ensure smooth airflow, which not only improves the operating efficiency of the fan 200 but also reduces energy consumption. Furthermore, the filter media and sealing materials of the HEPA filter have excellent chemical stability and corrosion resistance, enabling the filter to maintain stable operation in various harsh environments.

[0038] Reference Figure 5As shown in the embodiment of the present invention, the side plate 320 of the heat exchanger 300 near the crossbeam 130 is sealed to the crossbeam 130 to isolate the mounting port 111 and the air inlet 140, thereby preventing airflow from directly entering the fan 200 through the space between the heat exchanger 300 and the crossbeam 130. This ensures that the airflow passes through the heat exchanger 300 to the maximum extent, thereby improving the heat exchange efficiency of the heat exchanger 300. The lower end of the heat exchanger 300 can be sealed to the base plate, and the left and right sides of the heat exchanger 300 are sealed to the left side wall 112 and the right side wall 113, respectively, further preventing airflow from entering the fan 200 without passing through the heat exchanger 300. Meanwhile, when the air handling unit 1000 is in standby or off state, i.e., when the fan 200 is stopped, refrigerant leakage may occur. Since refrigerant is usually heavier than air, if the heat exchanger 300, housing 100, and crossbeam 130 are not sealed, refrigerant can easily seep out from the gaps between the heat exchanger 300 and housing 100, and between the heat exchanger 300 and crossbeam 130, failing to pass through the refrigerant sensor 400. This prevents the refrigerant sensor 400 from detecting the leak in time, potentially leading to a hazard. The high-efficiency filter can provide a certain degree of sealing, helping to prevent leaked refrigerant from diffusing downwards and flowing out from the air inlet 140.

[0039] Therefore, by setting up a sealed connection between the heat exchanger 300, the housing 100, and the crossbeam 130, refrigerant can accumulate above the heat exchanger 300 even when the air handling unit 1000 is in standby or off state. Once the concentration reaches a certain level, it can be detected relatively quickly by the refrigerant sensor 400 during its upward diffusion process, which helps improve the detection accuracy of the refrigerant sensor 400 and thus enhances the safety of the air handling unit 1000.

[0040] In an embodiment of the present invention, the crossbeam 130 is connected to one side wall of the peripheral wall 110. For example, see... Figure 6 As shown, the crossbeam 130 is connected to the rear side wall 114 of the peripheral wall 110, and the refrigerant sensor 400 is connected to the crossbeam 130. It is understood that when the air intake 230 of the fan 200 faces the rear side wall 114, it facilitates airflow through the refrigerant sensor 400. When refrigerant leaks within the heat exchanger 300, it can also be detected and trigger an alarm by the refrigerant sensor 400. Simultaneously, placing the refrigerant sensor 400 on the rear side wall 114 allows for convenient disassembly and assembly of the fan 200 without removing the sensor, improving the efficiency of fan disassembly and assembly. Alternatively, the crossbeam 130 can also be connected to either the left side wall 112 or the right side wall 113 of the peripheral wall 110, depending on the specific circumstances.

[0041] Reference Figure 2As shown, in an embodiment of the present invention, the air handling unit 1000 further includes a bracket 410, through which the refrigerant sensor 400 is mounted on the crossbeam 130. The bracket 410 includes a shielding portion 411, which is located above the refrigerant sensor 400. It is understood that condensation easily forms inside the air handling unit 1000 during cooling. For example, see reference... Figure 3 As shown, the air handling unit 1000 also includes piping, which is connected to a heat exchanger 300. The heat exchanger 300 is an evaporator, which is connected to a condenser located outdoors via piping. Therefore, condensation may occur on the piping, and when this condensation drips from the piping, it may drip onto the refrigerant sensor 400, potentially causing the sensor to malfunction or reducing its detection accuracy. Therefore, by positioning the shielding part 411 of the bracket 410 above the refrigerant sensor 400, the amount of condensation dripping onto the refrigerant sensor 400 can be reduced, thereby improving the reliability of the refrigerant sensor 400.

[0042] Reference Figure 3 As shown, in an embodiment of the present invention, the peripheral wall 110 includes a left side wall 112 and a right side wall 113 arranged opposite to each other. The fan 200 includes a volute 210, with the air outlet 220 of the volute 210 located near the right side wall 113. Along the left-right direction, the refrigerant sensor 400 is located near the right side wall 113. It is understood that, due to the shape of the volute 210, the space on the right side of the volute 210 within the housing 100 is larger than the space on the left side. Therefore, placing the refrigerant sensor 400 near the right side wall 113 allows for convenient disassembly of the fan 200 without disassembling the refrigerant sensor 400, reducing the number of parts that need to be disassembled and improving the maintenance efficiency of the fan 200.

[0043] Reference Figure 3 As shown, in an embodiment of the present invention, when the refrigerant sensor 400 is located on the front side of the housing 100, the orthographic projection of the fan 200 and the orthographic projection of the refrigerant sensor 400 are misaligned on the front-to-back projection plane. This misalignment means that the outline of the refrigerant sensor 400 is not within the outer outline of the fan 200. When the refrigerant sensor 400 is located on the rear side of the housing 100, refer to... Figure 7 As shown, on the projection plane from front to back, the orthographic projection of the fan 200 is also offset from the orthographic projection of the refrigerant sensor 400. Understandably, the refrigerant sensor 400 is also exposed at the mounting port 111, making it easy for maintenance personnel to see its position and thus facilitating its installation and removal, thereby improving maintenance efficiency.

[0044] Reference Figure 8As shown in the embodiment of the present invention, the bottom wall 150 further includes a water receiving tray 500. The water receiving tray 500 has baffles 530 on both sides along the front-rear direction. The baffles 530 are bent upwards to enclose a water receiving trough 520. The lower end of the heat exchanger 300 is located within the water receiving trough 520. Because the heat exchanger 300 is inclined downwards, when condensate is generated by the heat exchanger 300, the condensate flows along the heat exchanger 300 into the water receiving trough 520, thus preventing condensate overflow and leakage of the air handling unit 1000. The lower end of the filter screen 311 can also be located within the water receiving trough 520, but there is a certain gap between it and the bottom wall 150 of the water receiving trough 520. Therefore, the baffles 530 of the water receiving trough 520 serve a limiting function while also preventing direct contact between condensate and the filter screen 311, which could reduce the filtration effect.

[0045] To drain the condensate from the drip tray 500, as shown in Figure 7, the drip tray 500 is equipped with a drain connector 510. A drain pipe connects to the drain connector 510, allowing the condensate in the drip trough 520 to be drained to a suitable location. To improve drainage efficiency, two drain connectors 510 can be provided, arranged side-by-side, to maximize the drainage of condensate from the drip trough 520. Furthermore, if one drain connector 510 becomes clogged, the other drain connector 510 can still function as a drain, effectively preventing condensate from overflowing the drip tray 500 and improving the reliability of the air handling unit 1000.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An air handling unit, characterized in that, include: The housing includes a peripheral wall, and the peripheral wall is provided with an installation opening; The fan is installed inside the housing; A heat exchanger is installed inside the housing and located below the fan; The front panel is detachably connected to the peripheral wall and covers the mounting port; A refrigerant sensor is installed inside the enclosure and configured to be visible through the mounting port when the front panel is removed.

2. The air handling unit according to claim 1, characterized in that: The box also includes a crossbeam, which is fixedly connected to the middle of the box.

3. The air handling unit according to claim 2, characterized in that: The peripheral wall is also provided with an air inlet, which is located below the mounting port. The crossbeam is fixedly connected to the front end of the peripheral wall and is located between the air inlet and the mounting port.

4. The air handling unit according to claim 3, characterized in that: The housing also includes a bottom wall connected to the peripheral wall, one end of the heat exchanger is connected to the crossbeam, and the other end of the heat exchanger is connected to the bottom wall; along the vertical direction, the refrigerant sensor is located on the side of the heat exchanger near the mounting port.

5. The air handling unit according to claim 4, characterized in that: The heat exchanger is configured to be tilted downwards in a front-to-back direction, and the refrigerant sensor is located on the extension line of the upper end face of the heat exchanger.

6. The air handling unit according to claim 4, characterized in that: The heat exchanger's side plate near the crossbeam is sealed to the crossbeam to isolate the mounting port and the air inlet.

7. The air handling unit according to claim 2, characterized in that: The crossbeam is connected to one side wall of the peripheral wall.

8. The air handling unit according to any one of claims 2 to 7, characterized in that: The refrigerant sensor is mounted on the crossbeam.

9. The air handling unit according to claim 8, characterized in that: The air handling unit also includes a bracket, through which the refrigerant sensor is mounted on the crossbeam. The bracket includes a shielding portion located above the refrigerant sensor.

10. The air handling unit according to any one of claims 1 to 7, characterized in that: The peripheral wall includes a left side wall and a right side wall arranged opposite to each other. The fan includes a volute, and the air outlet of the volute is located on the side near the right side wall along the left-right direction. The refrigerant sensor is located on the side near the right side wall.

11. The air handling unit according to any one of claims 1 to 7, characterized in that: On the projection plane from front to back, the orthographic projection of the fan and the orthographic projection of the refrigerant sensor are arranged in a staggered manner.

12. The air handling unit according to claim 1, characterized in that: The peripheral wall is also provided with an air inlet, which is located below the mounting port. The air handling unit also includes a filter assembly, which is installed on the side of the heat exchanger facing the air inlet.

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