Refrigerant switching device and heating and ventilation system

Abstract

The utility model discloses a refrigerant switching device and a heating and ventilation system, the refrigerant switching device comprises a shell, a pipeline assembly and an air blowing assembly, the shell is provided with a containing cavity, and at least one wall of the shell is provided with an air outlet; the pipeline assembly is located in the containing cavity and connected with the shell, and the pipeline assembly is used for achieving refrigerant circulation between a load unit and a heat source unit in the heating and ventilation system and controlling the flow direction or / and flow of a refrigerant between the load unit and the heat source unit; the air blowing assembly communicates with the containing cavity and the outside and comprises a fan, and the fan is provided with an air inlet side and an air outlet side; the air outlet side is arranged in the first direction, the fan drives air in the containing cavity to be discharged to the outside in the first direction, and the first direction is arranged downwards relative to the horizontal line. The fan blows air downwards in the first direction to form air flow blowing downwards, so that the refrigerant deposited and accumulated at the bottom is stirred by the air flow, and the situation that the concentration of the local refrigerant exceeds the standard due to refrigerant accumulation is reduced.

Description

Technical Field

[0001] This application relates to the field of air conditioners, and particularly to a refrigerant switching device and a heating, ventilation and air conditioning (HVAC) system. Background Art

[0002] In a multi-connected air conditioner system, refrigerant is transmitted between an outdoor unit and an indoor unit through a refrigerant switching device, enabling one outdoor unit to work with multiple indoor units simultaneously. Refrigerant is a medium used to transfer heat energy in the air conditioner system. It is a substance that easily absorbs heat and turns into a gas, and easily releases heat and turns into a liquid, allowing heat energy to be transferred through evaporation and condensation.

[0003] However, in related technologies, since the density of some refrigerants is greater than that of air, and refrigerants are flammable and explosive, when refrigerant leakage occurs in the refrigerant switching device, a phenomenon of refrigerant sinking and accumulating will occur. The accumulation of refrigerant easily leads to an excessive refrigerant concentration and thus safety accidents. Summary of the Utility Model

[0004] Embodiments of this application provide a refrigerant switching device and an HVAC system. When refrigerant leaks, the refrigerant switching device can stir the refrigerant that has sunk to the bottom, reducing the sinking and accumulation of the refrigerant.

[0005] In a first aspect, embodiments of this application provide a refrigerant switching device, including a housing, a pipeline assembly, and a blowing assembly. The housing has a receiving cavity, and at least one wall of the housing is provided with an air outlet. The pipeline assembly is located in the receiving cavity and is connected to the housing. The pipeline assembly is used to realize the refrigerant circulation between a load unit and a heat source unit in the HVAC system, and control the refrigerant flow direction and / or flow rate between the load unit and the heat source unit. The blowing assembly communicates the receiving cavity with the outside. The blowing assembly includes a fan, and the fan has an air inlet side and an air outlet side. Wherein, the air outlet side is arranged towards a first direction, and the fan drives the air in the receiving cavity to be discharged to the outside along the first direction. The first direction is set downward relative to the horizontal line.

[0006] In some embodiments of this application, the fan is installed in the receiving cavity. The air inlet side is communicated with the receiving cavity, the air outlet side is communicated with the air outlet, the air outlet is communicated with the outside, and the fan drives the air in the receiving cavity to flow through the air inlet side, the air outlet side, and the air outlet in sequence. The air outlet side guides the air to be discharged to the outside along the first direction through the air outlet, thereby forming a downward blowing airflow, so that the refrigerant that has sunk and accumulated is stirred by the airflow, thereby reducing the situation of excessive local refrigerant concentration caused by refrigerant accumulation.

[0007] In some embodiments of the present application, the blower is installed on the outer wall of the housing, the air inlet side is communicated with the air outlet, the air outlet side is communicated with the outside, the blower drives the air in the accommodating cavity to flow through the air outlet, the air inlet side, and the air outlet side in sequence, and the air outlet side guides the air to be discharged to the outside along the first direction, so as to form a downward blowing air flow.

[0008] In some embodiments of the present application, the size of the air outlet is greater than or equal to the size of the air outlet side.

[0009] In some embodiments of the present application, the central axis of the air outlet is parallel to the horizontal line, so that the air in the accommodating cavity can enter the air outlet along the horizontal direction.

[0010] In some embodiments of the present application, the blower is any one of an axial flow blower and a radial centrifugal blower.

[0011] In some embodiments of the present application, the blowing assembly further includes a bracket, the bracket is provided with a hollow interior and forms a communication cavity with both ends penetrating, one side of the communication cavity is communicated with the blower, and the other side of the communication cavity is communicated with the air outlet, so as to improve the air exhaust efficiency of the blowing assembly.

[0012] In some embodiments of the present application, the bracket includes a supporting portion and a flanging structure extending outward from the supporting portion to the outside of the communication cavity, the supporting portion forms the communication cavity, an installation plate perpendicular to the first direction is arranged on one side of the communication cavity, the installation plate is for installing the blower, the flanging structure is arranged on the other side of the communication cavity, and the flanging structure is connected to the wall of the housing around the air outlet, so that the connection between the bracket and the housing is more firm.

[0013] In some embodiments of the present application, the bracket further includes a vertical edge portion, the vertical edge portion extends perpendicular to the installation plate, a first opening is formed in the installation plate, the first opening is communicated with the blower, the vertical edge portion encloses a second opening, the second opening is communicated with the air outlet, and the first opening and the second opening are arranged opposite to each other.

[0014] In some embodiments of the present application, the vertical edge portion has an upper vertical edge portion and a lower vertical edge portion, the flanging structure is turned up through the upper vertical edge portion to form an upper flanging portion, the flanging structure is turned down through the lower vertical edge portion to form the lower flanging portion, the extending length of the upper vertical edge portion is different from the extending length of the lower vertical edge portion, the side surfaces of the upper flanging portion and the lower flanging portion facing the housing are arranged in the same plane, and the installation plate extends obliquely from the upper vertical edge portion to the lower vertical edge portion.

[0015] In some embodiments of the present application, the upper flanging part and the lower flanging part are respectively connected to the inner wall surface of the housing to improve the connection stability therebetween; the first opening is communicated with the air outlet side of the fan, the second opening is communicated with the air discharge port, and the extending length of the upper vertical edge part is less than that of the lower vertical edge part.

[0016] In some embodiments of the present application, the fan assembly further includes an air outlet grille, the air outlet grille is fixed to the second opening or fixed to the air discharge port, and the air outlet grille covers at least a part of the air discharge port or covers at least a part of the second opening, so as to reduce foreign impurities or foreign objects from entering the accommodation cavity from the air discharge port or the second opening.

[0017] In some embodiments of the present application, two side vertical edge parts are oppositely arranged along the left - right direction on the vertical edge part, the air outlet grille includes a grille main body and connecting parts located on both sides of the grille main body, and the connecting parts are detachably connected to the corresponding side vertical edge parts, so as to facilitate the disassembly and replacement of the grille main body.

[0018] In some embodiments of the present application, the upper flanging part and the lower flanging part are respectively connected to the outer wall surface of the housing, the first opening is communicated with the air inlet side of the fan, the second opening is communicated with the air discharge port, and the extending length of the upper vertical edge part is greater than that of the lower vertical edge part.

[0019] In some embodiments of the present application, the fan assembly further includes an air outlet grille, the air outlet grille is fixed to the air outlet side of the fan, so as to reduce foreign impurities or foreign objects from entering the accommodation cavity from the air outlet side.

[0020] In some embodiments of the present application, the housing includes a top cover, a plurality of side enclosing plates and a water receiving tray. The top cover and the water receiving tray are located on the upper and lower sides of the plurality of side enclosing plates and are both connected to the side enclosing plates. The top cover, the side enclosing plates and the water receiving tray enclose to form the accommodation cavity. At least one of the plurality of side enclosing plates is provided with the air discharge port, and the fan assembly is installed on the side enclosing plate, so as to facilitate the air discharge from the air discharge port to the outside and form a downward blowing air flow, reducing the influence of the condensed water in the accommodation cavity on the air discharge port.

[0021] In some embodiments of the present application, an air return opening is further provided on the side enclosing plate or the top cover, and the air return opening is communicated with the accommodation cavity, so that the air in the accommodation cavity can be replaced more quickly, and the refrigerant leaked into the accommodation cavity can also be quickly discharged from the accommodation cavity.

[0022] In some embodiments of the present application, the plurality of side wall panels include two side plates that are spaced apart relatively. The air exhaust port is provided on one of the side plates, and the air return port is provided on the other side plate. Thereby, the refrigerant leaked into various parts of the accommodation cavity can be discharged more completely, so as to minimize the refrigerant residue in the accommodation cavity.

[0023] In some embodiments of the present application, the two side plates are spaced apart relatively along the length direction of the housing, and the air exhaust port and the air return port are respectively provided on two sides in the length direction of the housing.

[0024] In some embodiments of the present application, the pipeline assembly has multiple rows of refrigerant branches arranged in parallel. Each refrigerant branch has at least one valve body, and the valve body controls the flow rate or flow direction of the refrigerant. The multiple rows of refrigerant branches have multiple valve bodies, and the multiple valve bodies are arranged in at least one row along the length direction of the housing. The fan drives air to enter the accommodation cavity from the air return port, passes through at least one row of valve bodies, and discharges the air from the housing through the air exhaust port.

[0025] In some embodiments of the present application, the refrigerant switching device further includes an air return grille connected to the housing. The air return grille covers at least a part of the air return port to reduce impurities or foreign objects from entering the accommodation cavity from the air return port.

[0026] In some embodiments of the present application, a sponge is provided on at least one of the top cover, the plurality of side wall panels, and the water receiving tray.

[0027] In some embodiments of the present application, the number of the air exhaust ports is at least two, and the number of the blowing assemblies matches the number of the air exhaust ports. One blowing assembly is provided corresponding to one air exhaust port, thereby improving the blowing efficiency of the blowing assemblies.

[0028] In some embodiments of the present application, the refrigerant switching device further includes a refrigerant monitoring sensor and a control unit electrically connected to the refrigerant monitoring sensor. The refrigerant monitoring sensor is disposed in the housing for monitoring the refrigerant concentration in the housing, and the control unit is used to control the opening and closing of the fan according to the monitored refrigerant concentration.

[0029] In some embodiments of the present application, when the refrigerant concentration in the housing is greater than a first preset threshold, the control unit first controls the valve to open the air exhaust port, and then controls the fan to start. The fan discharges the air containing refrigerant in the accommodation cavity along the first direction.

[0030] In some embodiments of the present application, when the refrigerant concentration in the housing is greater than a second preset threshold, and the second preset threshold is less than the first preset threshold, the control unit controls the fan to turn off, and then controls the valve to close the air outlet. When the valve closes the air outlet, the housing becomes an airtight housing.

[0031] In some embodiments of the present application, the refrigerant switching device further includes a circuit board assembly. An electrical cavity independent of the accommodation cavity is also provided in the housing. The circuit board assembly is disposed in the electrical cavity. The fan is electrically connected to the circuit board assembly and is controlled by the circuit board assembly.

[0032] In a second aspect, embodiments of the present application further provide a heating, ventilation, and air conditioning (HVAC) system, including a heat source unit, a load unit, and the refrigerant switching device according to any one of the above embodiments. A refrigerant circulation loop is formed between the heat source unit and the load unit, and the refrigerant switching device is disposed on the refrigerant circulation loop.

[0033] In some embodiments of the present application, the HVAC system includes at least one heat source unit, a plurality of load units, and an exhaust air duct. A plurality of the refrigerant switching devices are provided between at least one of the heat source units and the plurality of load units, and the refrigerant switching devices are installed in an indoor space; the air outlet is communicated with the exhaust air duct, and the exhaust air duct guides the air discharged from the refrigerant switching device to the outside of the indoor space; wherein, the fan drives the air in the accommodation cavity to be discharged to the outside along a first direction, and the first direction faces the bottom of the exhaust air duct.

[0034] In some embodiments of the present application, the exhaust air duct includes a main collecting duct and a plurality of branch ducts. One end of each branch duct is communicated with the air outlet of one of the refrigerant switching devices, and the other end of each branch duct is communicated with the main collecting duct, and the main collecting duct is communicated to the outdoor space.

[0035] In some embodiments of the present application, the HVAC system includes at least one heat source unit and a plurality of load units. A plurality of the refrigerant switching devices are provided between the at least one heat source unit and the plurality of load units, and the plurality of refrigerant switching devices are installed in the ceiling space of the indoor. The ceiling space is separated from other spaces in the indoor by a ceiling, and the plurality of refrigerant switching devices are installed above the ceiling; wherein, the fan drives the air in the accommodation cavity to be discharged to the outside along a first direction, and the first direction faces the ceiling.

[0036] In some embodiments of the present application, the ceiling space is provided with an air outlet communicating with the outside.

[0037] The beneficial effects of the embodiments of the present application are as follows: When there are problems such as pipeline structure breakage and seal failure at the connection of valves in the refrigerant switching device, resulting in refrigerant leakage in the pipeline structure, the gaseous refrigerant will disperse inside and outside the housing. At the same time, since the density of the refrigerant itself is greater than that of air, the leaked refrigerant will gradually sink to the bottom and accumulate. At this time, the fan can blow air downward, so that the refrigerant accumulated at the bottom is stirred by the air flow, thereby reducing the situation where the local refrigerant concentration exceeds the standard due to the accumulation of the refrigerant, reducing the risk of explosion caused by the excessive concentration of the refrigerant, and improving safety. At the same time, the blowing component can also timely discharge the refrigerant leaked into the accommodation cavity from the accommodation cavity, avoiding safety accidents caused by the refrigerant staying in the narrow housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 Structural schematic diagram of a refrigerant switching device in an embodiment of the present application;

[0040] Figure 2 Cross-sectional structural schematic diagram of a refrigerant switching device in an embodiment of the present application;

[0041] Figure 3 Structural schematic diagram of a part of a refrigerant switching device in an embodiment of the present application;

[0042] Figure 4 Structural schematic diagram of a part of a refrigerant switching device in another embodiment of the present application;

[0043] Figure 5 Structural schematic diagram of a part of a refrigerant switching device in an embodiment of the present application;

[0044] Figure 6 Structural schematic diagram of a blowing component in an embodiment of the present application;

[0045] Figure 7 Structural schematic diagram of a blowing component and an air outlet grille in an embodiment of the present application;

[0046] Figure 8 Structural schematic diagram of a blowing component and an air outlet grille in an embodiment of the present application;

[0047] Figure 9 Structural schematic diagram of a part of a refrigerant switching device in an embodiment of the present application;

[0048] Figure 10 Schematic diagram of the connection structure of the HVAC system in an embodiment of the present application;

[0049] Figure 11 Schematic diagram of the structure of the HVAC system in an embodiment of the present application;

[0050] Figure 12 Schematic diagram of the structure of the HVAC system in another embodiment of the present application.

[0051] Reference numerals:

[0052] 1, refrigerant switching device;

[0053] 10, housing; 11, accommodation cavity; 12, air outlet; 13, air return opening; 14, top cover; 15, side enclosure; 151, side plate; 16, water receiving tray; 17, sponge;

[0054] 20, pipeline assembly; 21, refrigerant branch; 22, valve body;

[0055] 30, blowing assembly; 31, fan; 311, air inlet side; 312, air outlet side; 32, bracket; 321, support part; 322, flanging structure; 3221, upper flanging part; 3222, lower flanging part; 323, mounting plate; 324, vertical edge part; 3241, upper vertical edge part; 3242, lower vertical edge part; 3243, side vertical edge part; 325, protruding part;

[0056] 40, air outlet grille; 41, grille main body; 42, connecting part;

[0057] 50, heat source unit; 60, load unit; 70, valve; 80, exhaust air passage; 81, collecting air duct; 82, branch air duct; 83, exhaust fan;

[0058] L1, first direction; M, axis direction of the air outlet side. Detailed implementation manners

[0059] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0060] In related technologies, new regulations in the North American region require the use of 454B refrigerant in air conditioning systems. Since the density of 454B refrigerant is greater than that of air, if 454B refrigerant leaks, a sinking phenomenon will occur, causing the leaked refrigerant to accumulate at the bottom of the room, which is likely to lead to an excessive concentration of local refrigerant and thus explosion.

[0061] In view of the above situation, in the first aspect, please refer to Figures 1 - 3 , the present application provides a refrigerant switching device 1, which includes a housing 10, a pipeline assembly 20, and a blowing assembly 30.

[0062] The housing 10 has an accommodation cavity 11, and at least one wall of the housing 10 is provided with an air outlet 12. The housing 10 is a protective shell of the refrigerant switching device 1. The overall shape of the housing 10 can be a cuboid, a cube, a cylinder, or other shapes, which are not specifically limited in the present application. The air outlet 12 can discharge the air in the accommodation cavity 11 to the outside of the housing 10.

[0063] The pipeline assembly 20 is located in the accommodation cavity 11 and is connected to the housing 10. Refrigerant is transported and transferred in the pipeline assembly 20. The pipeline assembly 20 is used to realize the refrigerant circulation between the load unit 60 and the heat source unit 50 in the HVAC system, and control the refrigerant flow direction and / or flow rate between the load unit 60 and the heat source unit 50.

[0064] The blowing assembly 30 communicates with the accommodation cavity 11 and the outside. The blowing assembly 30 includes a fan 31, and the fan 31 has an air inlet side 311 and an air outlet side 312; wherein, the air outlet side 312 is arranged toward the first direction L1. The fan 31 drives the air in the accommodation cavity 11 to be discharged to the outside along the first direction L1. The first direction L1 is arranged downward relative to the horizontal line. That is to say, an angle α is formed between the first direction L1 and the horizontal line (as Figure 4 shown). The fan 31 can blow the air in the accommodation cavity 11 downward. For example, when the refrigerant switching device 1 is installed on the ceiling in a room, the air outlet of the blowing assembly 30 faces the floor of the room, and the air blown downward by the blowing assembly 30 can form a disturbance air flow, and the disturbance air flow is used to stir the refrigerant accumulated at the bottom. Among them, the air flow blown downward by the fan 31 can be toward the lower part of the housing 10 or toward the bottom of the room, which is not specifically limited here.

[0065] It should be noted that when there are problems such as damage to the pipeline structure or seal failure at the connection of the valve 70 in the refrigerant switching device 1, resulting in refrigerant leakage in the pipeline structure, the gaseous refrigerant will disperse inside and outside the housing 10. At the same time, because the density of the refrigerant itself is greater than the density of air, the leaked refrigerant will gradually sink to the bottom and accumulate. At this time, the fan 31 can blow out an air flow downward, so that the refrigerant accumulated at the bottom is stirred by the air flow, thereby reducing the situation of local refrigerant concentration exceeding the standard caused by the accumulation of refrigerant, reducing the risk of explosion caused by excessive refrigerant concentration, and improving safety. Generally, if the refrigerant switching device 1 is set in an environment such as a meeting room, there will be ventilation equipment in the meeting room, such as a ventilation fan, for ventilating the room. After the refrigerant accumulated at the bottom of the room is stirred, it is more conducive to the discharge of the refrigerant in the room to the outside.

[0066] It is understandable that the blower 31 can discharge the air in the accommodation chamber 11 to the outside. That is to say, the blower 31 can also timely discharge the refrigerant leaked into the accommodation chamber 11 from the accommodation chamber 11 to avoid safety accidents caused by the refrigerant staying in the narrow housing 10. At the same time, as the blower 31 continuously discharges the air in the accommodation chamber 11 to the outside, the outside air will re-enter the accommodation chamber 11. That is to say, the blower 31 can also play a role in dissipating heat for components such as the valve 70 in the accommodation chamber 11.

[0067] As Figures 1 - 2 shown, the number of air outlets 12 is at least two, and the number of blowing components 30 matches the number of air outlets 12. One blowing component 30 is arranged corresponding to one air outlet 12, thereby improving the blowing efficiency of the blowing component 30, and multiple air outlets 12 can exhaust air to different positions below respectively, so as to form multiple disturbance airflows. Through these multiple disturbance airflows, the situation of local refrigerant concentration exceeding the standard caused by the accumulation of refrigerant can be further reduced.

[0068] Please refer to Figures 1 - 2 , in some embodiments of the present application, the blower 31 is installed in the accommodation chamber 11, and the housing 10 can provide protection for the installation of the blower 31. The air inlet side 311 (as Figure 5 shown) is communicated with the accommodation chamber 11, the air outlet side 312 (as Figure 5 shown) is communicated with the air outlet 12, and the air outlet 12 is communicated with the outside. Therefore, the blower 31 can drive the air in the accommodation chamber 11 to flow through the air inlet side 311, the air outlet side 312, and the air outlet 12 in sequence. Among them, the air outlet side 312 can guide the discharged air to be discharged to the outside from the air outlet 12 along the first direction L1. It is understandable that at this time, the discharged air will form a downward blowing air current along the first direction L1.

[0069] Or, please refer to Figures 3 - 4 , in some embodiments of the present application, the blower 31 is installed on the outer wall of the housing 10, the air inlet side 311 is communicated with the air outlet 12, the air outlet side 312 is communicated with the outside, and the blower 31 drives the air in the accommodation chamber 11 to flow through the air outlet 12, the air inlet side 311, and the air outlet side 312 in sequence. Among them, the air outlet side 312 guides the air to be discharged to the outside along the first direction L1, and at this time, the discharged air will also form a downward blowing air current along the first direction L1.

[0070] Further, when the size of the air outlet 12 is equal to the size of the air outlet side 312, the air flowing out from the air outlet 12 can smoothly discharge from the air outlet side 312; or, when the size of the air outlet 12 is larger than the size of the air outlet side 312, more air in the accommodation cavity 11 can enter the air outlet 12 first, and then after passing through the air inlet side 311, discharge from the air outlet side 312. Since the size of the air outlet side 312 is smaller than the size of the air outlet 12, the air flow velocity discharged from the air outlet side 312 increases at this time, and thus the downward blowing air flow velocity generated is also relatively large.

[0071] Wherein, the central axis of the air outlet 12 is parallel to the horizontal line, so that the air in the accommodation cavity 11 can enter the air outlet 12 in the horizontal direction. In some embodiments, the fan 31 is any one of an axial flow fan 31 and a radial centrifugal fan 31 to extract the air in the accommodation cavity 11 and discharge it to the outside.

[0072] Please refer to Figure 5 , in some embodiments of the present application, the blowing assembly 30 further includes a bracket 32. The bracket 32 is hollow and forms a communication cavity (not shown in the figure) with both ends penetrating. One side of the communication cavity is communicated with the fan 31, and the other side of the communication cavity is communicated with the air outlet 12. That is, the air outlet side 312 is communicated with the air outlet 12 through the communication cavity. The air in the accommodation cavity 11 enters from the air outlet side 312 of the fan 31, flows through the communication cavity, and blows out from the air outlet 12 on the housing 10, thereby improving the exhaust efficiency of the fan 31.

[0073] Please refer to Figures 5 - 6 , in some embodiments of the present application, the bracket 32 includes a support portion 321 and a flanging structure 322 extending from the support portion 321 to the outside of the communication cavity. The support portion 321 forms the communication cavity. An installation plate 323 perpendicular to the first direction L1 is provided on one side of the communication cavity. The installation plate 323 is for installing the fan 31. That is, the fan 31 is fixed on the installation plate 323 on the side of the support portion 321, and the flanging structure 322 is arranged on the other side of the communication cavity.

[0074] Wherein, the flanging structure 322 extends from the support portion 321 to the outside of the communication cavity, thereby increasing the contact area between the flanging structure 322 and the housing 10, and thus improving the connection stability between the two. Exemplarily, a plurality of flanging structures 322 can be provided, and the plurality of flanging structures 322 are arranged around the circumference of the support portion 321. The flanging structure 322 is connected to the wall of the housing 10 on the circumference of the air outlet 12, so that the connection between the support portion 321 and the housing 10 is more firm. At the same time, the flanging structure 322 is in close contact with and connected to the wall of the housing 10, and thus the connection tightness between the bracket 32 and the housing 10 can also be improved, reducing air leakage.

[0075] Please refer to Figure 5, in some embodiments of the present application, the bracket 32 further includes a vertical edge portion 324. The vertical edge portion 324 extends perpendicular to the mounting plate 323. The mounting plate 323 is provided with a first opening (not shown in the figure), and the first opening communicates with the fan 31. The vertical edge portion 324 encloses a second opening (not shown in the figure), and the second opening communicates with the air outlet 12. Moreover, the first opening and the second opening are disposed opposite to each other. That is to say, the side of the communication cavity facing the mounting plate 323 communicates with the first opening, and the side of the communication cavity away from the mounting plate 323 communicates with the second opening.

[0076] Please refer to Figures 5 - 6 , in some embodiments of the present application, the vertical edge portion 324 has an upper vertical edge portion 3241 and a lower vertical edge portion 3242. The flanging structure 322 is flanged upward via the upper vertical edge portion 3241 to form an upper flanging portion 3221, and the flanging structure 322 is flanged downward via the lower vertical edge portion 3242 to form a lower flanging portion 3222. The side surfaces of the upper flanging portion 3221 and the lower flanging portion 3222 facing the housing 10 are coplanarly arranged, and the mounting plate 323 extends obliquely from the upper vertical edge portion 3241 to the lower vertical edge portion 3242.

[0077] It should be noted that the mounting plate 323 is obliquely arranged, so that the fan 31 mounted on the mounting plate 323 is also obliquely arranged, so that the axis M of the air outlet side 312 of the fan 31 can form an angle with the horizontal plane, thereby facilitating the formation of a downward blowing air flow. Among them, the axis M of the air outlet side 312 is parallel to the first direction L1. At the same time, because the mounting plate 323 is obliquely arranged, the extension length of the upper vertical edge portion 3241 from the mounting plate 323 to the upper flanging portion 3221 is different from the extension length of the lower vertical edge portion 3242 from the mounting plate 323 to the upper flanging portion 3221.

[0078] In some embodiments, please refer to Figures 5 - 7 , the upper flanging portion 3221 and the lower flanging portion 3222 are respectively connected to the inner wall surface of the housing 10. The first opening communicates with the air outlet side 312 of the fan 31, and the second opening communicates with the air outlet 12. The extension length of the upper vertical edge portion 3241 is less than the extension length of the lower vertical edge portion 3242.

[0079] Exemplarily, as Figures 5 - 6 shown, the vertical edge portion 324 has a first surface close to the housing 10. A protruding member 325 is provided on the first surface, and the protruding member 325 is close to the lower vertical edge portion 3242. When the flanging structure 322 is connected to the housing 10, the upper vertical edge portion 3241 contacts the housing 10, and the lower vertical edge portion 3242 contacts the housing 10 through the protruding member 325, so that the mounting plate 323 is in an inclined state relative to the housing 10, thereby enabling the axis M of the air outlet side 312 of the fan 31 to form an angle with the horizontal plane, that is, the axis M of the air outlet side 312 of the fan 31 extends downward.

[0080] Please refer toFigures 7 - 8 , in some embodiments of the present application, the fan 31 assembly further includes an air outlet grille 40, which is fixed to the second opening or the air outlet 12. The air outlet grille 40 covers at least a part of the air outlet 12 or at least a part of the second opening. Specifically, the air outlet grille 40 is used to block the air outlet 12 or the second opening. Since the second opening communicates with the air outlet 12, the air outlet grille 40 can reduce the entry of foreign impurities or objects from the air outlet 12 or the second opening into the accommodation cavity 11.

[0081] Further, please refer to Figures 6 - 8 , there are two side vertical edges 3243 arranged oppositely in the left-right direction on the vertical edge part 324. The air outlet grille 40 includes a grille main body 41 and connecting parts 42 located on both sides of the grille main body 41. The connecting parts 42 are detachably connected to the corresponding side vertical edges 3243, so as to facilitate the disassembly and replacement of the grille main body 41. Specifically, the present application does not specifically limit the connection method between the connecting part 42 and the side vertical edge part 3243. For example, a connecting rod can be provided on the side vertical edge part 3243, and the connecting part 42 can be a socket ring. When the grille main body 41 is installed, the socket ring can be sleeved on the connecting rod; or, a jack can be opened on the side vertical edge part 3243, and the connecting part 42 can be a plug rod. When the grille main body 41 is installed, the plug rod can be inserted into the jack.

[0082] Or, in some other embodiments, please refer to Figures 5 - 6 , the upper flanging part 3221 and the lower flanging part 3222 are respectively connected to the outer wall surface of the housing 10. The first opening communicates with the air inlet side 311 of the fan 31, and the second opening communicates with the air outlet 12. The extension length of the upper vertical edge part 3241 is greater than that of the lower vertical edge part 3242.

[0083] Further, the fan 31 assembly further includes an air outlet grille 40, which is fixed to the air outlet side 312 of the fan 31. The air outlet grille 40 is used to block the air outlet side 312 of the fan 31. Therefore, the air outlet grille 40 can reduce the entry of foreign impurities or objects from the air outlet side 312 into the accommodation cavity 11.

[0084] Please refer to Figures 1 - 2, in some embodiments of the present application, the housing 10 includes a top cover 14, a plurality of side panels 15 and a water receiving tray 16. The top cover 14 and the water receiving tray 16 are located on the upper and lower sides of the plurality of side panels 15 respectively, and are both connected to the side panels 15. The top cover 14, the side panels 15 and the water receiving tray 16 enclose a receiving cavity 11. It is easy to understand that the water receiving tray 16 is located below the top cover 14. During the operation of the pipeline assembly 20, condensed water will be generated, and the condensed water can drip into the water receiving tray 16 under the action of gravity. At least one of the plurality of side panels 15 is provided with an air outlet 12, and the fan 31 assembly is installed on the side panel 15. That is to say, the air outlet 12 is located on the side of the housing 10, so as to facilitate the air outlet 12 to discharge air to the outside, and form a downward blowing air flow, reducing the influence of the condensed water in the receiving cavity 11 on the air outlet 12.

[0085] Further, please refer to Figure 2 , an air return opening 13 is also provided on the side panel 15 or the top cover 14, and the air return opening 13 is communicated with the receiving cavity 11. The air in the receiving cavity 11 is discharged to the outside of the receiving cavity 11 through the blowing assembly 30. At the same time, the outside air can enter the receiving cavity 11 from the air return opening 13, so that the air in the receiving cavity 11 can be replaced more quickly, and the refrigerant leaked into the receiving cavity 11 can also be quickly discharged from the receiving cavity 11.

[0086] Further, please continue to refer to Figure 2 , the plurality of side panels 15 include two side plates 151 arranged at intervals relatively. The air outlet 12 is arranged on one side plate 151, and the air return opening 13 is arranged on the other side plate 151.

[0087] Specifically, the two side plates 151 are arranged at intervals relatively along the length direction of the housing 10. The air outlet 12 and the air return opening 13 are respectively arranged on both sides in the length direction of the housing 10. That is to say, the air outlet 12 and the air return opening 13 are arranged opposite to each other on the housing 10. The air entering the receiving cavity 11 from the air return opening 13 needs to flow through the internal space of the receiving cavity 11 and then be discharged from the air outlet 12 of the receiving cavity 11, so that the refrigerant leaked into each part of the receiving cavity 11 can be discharged more completely, thereby minimizing the refrigerant residue in the receiving cavity 11 as much as possible. Among them, the bracket 32 is connected to the side plate 151 where the air outlet 12 is located, so as to facilitate the air outlet of the fan 31 to be communicated with the air outlet 12.

[0088] Furthermore, the refrigerant switching device 1 further includes an air return grille (not shown in the figure) connected to the housing 10. The air return grille covers at least part of the air return opening 13. The air return grille is used to block the air return opening 13 and reduce the entry of foreign impurities or foreign objects from the air return opening 13 into the receiving cavity 11.

[0089] Please refer to Figures 1 - 2, in some embodiments of the present application, the pipeline assembly 20 has multiple columns of refrigerant branches 21 arranged in parallel. Each refrigerant branch 21 has at least one valve body 22, and the valve body 22 controls the flow rate or flow direction of the refrigerant. Among them, in the refrigerant switching device 1, the refrigerant branches 21 in the pipeline assembly 20 have various different extending directions, and each refrigerant branch 21 can transport the refrigerant. The valve bodies 22 on the refrigerant branches 21 also include various different types of valves 70, such as solenoid valves, throttle valves, multi-way valves, etc. The valve 70 is used to control the opening and closing of the refrigerant branch 21, so as to control the flow of the refrigerant in the refrigerant branch 21.

[0090] The multiple columns of refrigerant branches 21 have multiple valve bodies 22, and the multiple valve bodies 22 are arranged in at least one row along the length direction of the housing 10. The fan 31 drives air to enter the accommodation cavity 11 from the air return opening 13, passes through at least one row of valve bodies 22, and is discharged from the air outlet 12 out of the housing 10. That is to say, the fan 31 can also timely discharge the refrigerant leaked into the accommodation cavity 11 out of the accommodation cavity 11, avoiding safety accidents caused by the refrigerant staying in the narrow housing 10. At the same time, the fan 31 can also play a role in dissipating heat for the components such as the valve body 22 in the accommodation cavity 11.

[0091] Please refer to Figure 9 , in some embodiments of the present application, at least one of the top cover 14, the multiple side panels 15 and the water receiving tray 16 is provided with a sponge 17. The sponge 17 can be used to absorb the condensed water dripping or splashing in the accommodation cavity 11. At the same time, the setting of the sponge 17 can reduce the noise generated when the fan 31 operates.

[0092] In some embodiments of the present application, the refrigerant switching device 1 further includes a refrigerant monitoring sensor and a control unit (not shown in the figure) electrically connected to the refrigerant monitoring sensor. The refrigerant monitoring sensor is arranged in the housing 10 and is used to monitor the refrigerant concentration in the housing 10. The control unit is used to control the opening and closing of the fan 31 according to the refrigerant concentration monitored by the refrigerant monitoring sensor.

[0093] Further, please refer to Figure 3 , the refrigerant switching device 1 further includes a valve 70. The valve 70 is used to open and close the air outlet 12. The control unit can also be used to control the opening and closing of the valve 70 according to the refrigerant concentration monitored by the refrigerant monitoring sensor.

[0094] Such as Figure 3As shown, when the refrigerant concentration in the housing 10 is greater than the first preset threshold, the control unit first controls the valve 70 to open the air outlet 12, and then controls the fan 31 to start. The fan 31 discharges the air containing refrigerant in the accommodation chamber 11 along the first direction L1. When the refrigerant concentration in the housing 10 is greater than the second preset threshold, the control unit controls the fan 31 to close, and then controls the valve 70 to close the air outlet 12. When the valve 70 closes the air outlet 12, the housing 10 is an airtight housing 10, where the second preset threshold is less than the first preset threshold.

[0095] In some embodiments of the present application, the refrigerant switching device 1 further includes a circuit board assembly (not shown in the figure). An electrical chamber independent of the accommodation chamber 11 is also provided in the housing 10. The circuit board assembly is arranged in the electrical chamber. During the operation of the pipeline assembly 20, condensed water may be generated or liquid leakage may occur. Since the electrical chamber is independently arranged from the accommodation chamber 11, it is possible to reduce the adverse effects of liquids such as condensed water in the accommodation chamber 11 on the circuit board assembly. The fan 31 is electrically connected to the circuit board assembly, and the circuit board assembly can control the working condition of the fan 31 so that the fan 31 can be started in time when refrigerant leakage occurs.

[0096] In a second aspect, please refer to Figure 10 , an embodiment of the present application further provides a heating, ventilation, and air conditioning (HVAC) system, including a heat source unit 50, a load unit 60, and the refrigerant switching device 1 as described in any one of the above embodiments. A refrigerant circulation loop is formed between the heat source unit 50 and the load unit 60, and the refrigerant switching device 1 is arranged on the refrigerant circulation loop. Among them, at least one load unit 60 is provided, and the heat source unit 50 is connected to one or more load units 60 through the refrigerant switching device 1. For example, the heat source unit 50 is an outdoor unit, and the load unit 60 is an indoor unit.

[0097] It can be understood that the refrigerant branch 21 in the refrigerant switching device 1 is connected to the refrigerant pipeline in the heat source unit 50 and the refrigerant pipeline in the load unit 60. The refrigerant circulates between the load unit 60 and the heat source unit 50 through the refrigerant branch 21 in the refrigerant switching device 1, so that the heat source unit 50 can switch between refrigeration and heating. The specific operation of the refrigerant switching device 1 has been publicly known in the related art and will not be elaborated in this application.

[0098] In some embodiments of the present application, please refer to Figure 11 , the HVAC system includes at least one heat source unit 50, a plurality of load units 60, and an exhaust air passage 80. A plurality of refrigerant switching devices 1 are arranged between at least one heat source unit 50 and the plurality of load units 60, and the refrigerant switching devices 1 are installed in the indoor space.

[0099] The exhaust port 12 is communicated with the exhaust passage 80, and the exhaust passage 80 guides the air discharged from the refrigerant switching device 1 to the outside of the indoor space; wherein, the fan 31 drives the air in the accommodation cavity 11 to be discharged to the outside along the first direction L1, and the first direction L1 faces the bottom of the exhaust passage 80.

[0100] Specifically, the exhaust passage 80 includes a collecting air duct 81 and a plurality of branch air ducts 82. One end of each branch air duct 82 is communicated with the exhaust port 12 of a refrigerant switching device 1, and the other end of each branch air duct 82 is communicated with the collecting air duct 81. The collecting air duct 81 is communicated to the outdoor space, and an exhaust fan 83 is connected to the side of the collecting air duct 81 facing the outdoor space, which is beneficial to the discharge of the refrigerant in the HVAC system from the exhaust passage 80 to the outside.

[0101] In some embodiments of the present application, please refer to Figure 12 , the HVAC system includes at least one heat source unit 50 and a plurality of load units 60. A plurality of refrigerant switching devices 1 are arranged between at least one heat source unit 50 and the plurality of load units 60. The plurality of refrigerant switching devices 1 are installed in the ceiling space of the room. The ceiling space is separated from other spaces in the room by a ceiling, and the plurality of refrigerant switching devices 1 are installed above the ceiling; wherein, the fan 31 drives the air in the accommodation cavity 11 to be discharged to the outside along the first direction L1, and the first direction L1 faces the ceiling.

[0102] Specifically, the ceiling space is provided with an air outlet communicating with the outside, and an exhaust fan 83 is arranged at the air outlet, so that after the refrigerant accumulated in the room is stirred, it is more beneficial for the refrigerant in the room to be discharged to the outside from the air outlet.

[0103] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for exemplary illustration and cannot be understood as a limitation to the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0104] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A refrigerant switching device, characterized in that, Comprising: A housing having a receiving cavity, and at least one wall of the housing is provided with an air outlet. A pipeline assembly located in the receiving cavity and connected to the housing, the pipeline assembly is used to realize the refrigerant circulation between the load unit and the heat source unit in the HVAC system, and control the refrigerant flow direction and / or flow rate between the load unit and the heat source unit. And A blowing assembly that communicates the receiving cavity with the outside, the blowing assembly includes a fan, and the fan has an air inlet side and an air outlet side. Wherein, the air outlet side is arranged towards the first direction, and the fan drives the air in the receiving cavity to be discharged to the outside along the first direction, and the first direction is arranged downward relative to the horizontal line.

2. The refrigerant switching device according to claim 1, wherein The fan is installed in the receiving cavity, the air inlet side is communicated with the receiving cavity, the air outlet side is communicated with the air outlet, the air outlet is communicated with the outside, the fan drives the air in the receiving cavity to flow through the air inlet side, the air outlet side, and the air outlet in sequence, and the air outlet side guides the air to be discharged to the outside along the first direction through the air outlet.

3. The refrigerant switching device according to claim 1, wherein The fan is installed on the outer wall of the housing, the air inlet side is communicated with the air outlet, the air outlet side is communicated with the outside, the fan drives the air in the receiving cavity to flow through the air outlet, the air inlet side, and the air outlet side in sequence, and the air outlet side guides the air to be discharged to the outside along the first direction.

4. The refrigerant switching device according to claim 3, wherein The size of the air outlet is greater than or equal to the size of the air outlet side.

5. The refrigerant switching device according to claim 3, wherein The central axis of the air outlet is parallel to the horizontal line.

6. The refrigerant switching device according to any one of claims 1 to 5, characterized in that The fan is any one of an axial flow fan and a radial centrifugal fan.

7. The refrigerant switching device according to claim 1, wherein The blowing assembly further includes a bracket, the bracket is hollow and forms a communication cavity with both ends penetrating, one side of the communication cavity is communicated with the fan, and the other side of the communication cavity is communicated with the air outlet.

8. The refrigerant switching device according to claim 7, wherein, The bracket includes a support portion and a flanging structure extending outward from the support portion to the outside of the communication cavity. The support portion forms the communication cavity. An installation plate perpendicular to the first direction is arranged on one side of the communication cavity, and the installation plate is for installing the fan. The flanging structure is arranged on the other side of the communication cavity, and the flanging structure is connected to the wall of the housing around the air outlet.

9. The refrigerant switching device according to claim 8, characterized in that, The bracket further includes a vertical edge portion that extends perpendicular to the installation plate. The installation plate is provided with a first opening that is communicated with the fan. The vertical edge portion encloses a second opening that is communicated with the air outlet, and the first opening and the second opening are arranged opposite to each other.

10. The refrigerant switching device according to claim 9, wherein The vertical edge portion has an upper vertical edge portion and a lower vertical edge portion. The flanging structure is turned up through the upper vertical edge portion to form an upper flanging portion, and the flanging structure is turned down through the lower vertical edge portion to form a lower flanging portion. The extending length of the upper vertical edge portion is different from the extending length of the lower vertical edge portion. The side surfaces of the upper flanging portion and the lower flanging portion facing the housing are coplanar, and the installation plate extends obliquely from the upper vertical edge portion to the lower vertical edge portion.

11. The refrigerant switching device according to claim 10, wherein, The upper flanging part and the lower flanging part are respectively connected to the inner wall surface of the housing. The first opening is communicated with the air outlet side of the fan, and the second opening is communicated with the air discharge port. The extending length of the upper vertical edge part is less than that of the lower vertical edge part.

12. The refrigerant switching device according to claim 11, wherein The fan assembly further includes an air outlet grille, which is fixed to the second opening or the air discharge port, and the air outlet grille covers at least a part of the air discharge port or at least a part of the second opening.

13. The refrigerant switching device according to claim 12, characterized in that, There are two side vertical edge parts arranged oppositely in the left-right direction on the vertical edge part. The air outlet grille includes a grille main body and connecting parts located on both sides of the grille main body, and the connecting parts are detachably connected to the corresponding side vertical edge parts.

14. The refrigerant switching device according to claim 10, wherein, The upper flanging part and the lower flanging part are respectively connected to the outer wall surface of the housing. The first opening is communicated with the air inlet side of the fan, and the second opening is communicated with the air discharge port. The extending length of the upper vertical edge part is greater than that of the lower vertical edge part.

15. The refrigerant switching device according to claim 14, wherein, The fan assembly further includes an air outlet grille, which is fixed to the air outlet side of the fan.

16. The refrigerant switching device according to any one of claims 1 to 5, characterized in that, The housing includes a top cover, a plurality of side panels and a water receiving tray. The top cover and the water receiving tray are located on the upper and lower sides of the plurality of side panels respectively, and are both connected to the side panels. The top cover, the side panels and the water receiving tray enclose to form the accommodating cavity. The air discharge port is opened on at least one of the plurality of side panels, and the fan assembly is installed on the side panel.

17. The refrigerant switching device according to claim 16, wherein There is also an air return opening opened on the side panel or the top cover, and the air return opening is communicated with the accommodating cavity.

18. The refrigerant switching device according to claim 17, characterized in that, The plurality of side panels include two side plates arranged oppositely at intervals. The air discharge port is arranged on one side plate, and the air return opening is arranged on the other side plate.

19. The refrigerant switching device according to claim 18, wherein The two side plates are arranged oppositely at intervals along the length direction of the housing, and the air discharge port and the air return opening are respectively arranged on both sides in the length direction of the housing.

20. The refrigerant switching device according to claim 18, characterized in that, The pipeline assembly has multiple columns of refrigerant branches arranged in parallel. Each refrigerant branch has at least one valve body, and the valve body controls the flow rate or flow direction of the refrigerant. The multiple columns of refrigerant branches have a plurality of valve bodies, and the plurality of valve bodies are arranged in at least one row along the length direction of the housing. The fan drives air to enter the accommodating cavity from the air return opening, passes through at least one row of valve bodies, and is discharged from the air discharge port out of the housing.

21. The refrigerant switching device according to claim 17, wherein It further includes an air return grille connected to the housing, and the air return grille covers at least a part of the air return opening.

22. The refrigerant switching device according to claim 16, characterized in that, There is a sponge provided on at least one of the top cover, the plurality of side panels and the water receiving tray.

23. The refrigerant switching device according to claim 1, wherein The number of the air discharge ports is at least two, and the number of the blowing assemblies matches the number of the air discharge ports. One blowing assembly is arranged corresponding to one air discharge port.

24. The refrigerant switching device according to any one of claims 1 to 5, characterized in that, It further includes a refrigerant monitoring sensor and a control part electrically connected to the refrigerant monitoring sensor. The refrigerant monitoring sensor is arranged inside the housing for monitoring the refrigerant concentration inside the housing, and the control part is used to control the opening and closing of the fan according to the monitored refrigerant concentration.

25. The refrigerant switching device according to claim 24, wherein, It further includes a valve for opening and closing the air outlet, and the control unit is further configured to control the opening and closing of the valve according to the monitored refrigerant concentration.

26. The refrigerant switching device according to claim 25, wherein, When the refrigerant concentration in the housing is greater than a first preset threshold, the control unit first controls the valve to open the air outlet, and then controls the fan to start, and the fan discharges the air containing refrigerant in the accommodation chamber along the first direction.

27. The refrigerant switching device according to claim 26, wherein When the refrigerant concentration in the housing is greater than a second preset threshold, and the second preset threshold is less than the first preset threshold, the control unit controls the fan to turn off, and then controls the valve to close the air outlet. When the valve closes the air outlet, the housing is an airtight housing.

28. The refrigerant switching device according to any one of claims 1 to 5, characterized in that, It further includes a circuit board assembly. An electrical chamber independent of the accommodation chamber is provided in the housing, the circuit board assembly is arranged in the electrical chamber, the fan is electrically connected to the circuit board assembly, and the fan is controlled by the circuit board assembly.

29. A heating, ventilation and air conditioning (HVAC) system, characterized in that, Comprising: A heat source unit; A load unit; And The refrigerant switching device according to any one of claims 1 to 28, a refrigerant circulation loop is formed between the heat source unit and the load unit, and the refrigerant switching device is arranged on the refrigerant circulation loop.

30. The HVAC system according to claim 29, wherein Comprising: At least one heat source unit and a plurality of load units, a plurality of the refrigerant switching devices are arranged between at least one of the heat source units and the plurality of load units, and the refrigerant switching devices are installed in an indoor space; An exhaust air channel, the air outlet is communicated with the exhaust air channel, and the exhaust air channel guides the air discharged from the refrigerant switching device to the outside of the indoor space; Wherein, the fan drives the air in the accommodation chamber to be discharged to the outside along the first direction, and the first direction faces the bottom of the exhaust air channel.

31. The HVAC system according to claim 30, wherein, The exhaust air channel includes a collecting air duct and a plurality of branch air ducts. One end of each branch air duct is communicated with the air outlet of one of the refrigerant switching devices, the other end of each branch air duct is communicated with the collecting air duct, and the collecting air duct is communicated to the outdoor space.

32. The HVAC system according to claim 29, wherein, Comprising: At least one heat source unit and a plurality of load units, a plurality of the refrigerant switching devices are arranged between the at least one heat source unit and the plurality of load units, and the plurality of refrigerant switching devices are installed in the ceiling space of the indoor, and the ceiling space is spaced from other spaces in the indoor by a ceiling, and the plurality of refrigerant switching devices are installed above the ceiling; Wherein, the fan drives the air in the accommodation chamber to be discharged to the outside along the first direction, and the first direction faces the ceiling.

33. The HVAC system according to claim 32, wherein, An air outlet communicating with the outside is provided in the ceiling space.

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