Indoor unit and heating and ventilation system

Abstract

The utility model discloses an indoor unit and a heating and ventilation system. The indoor unit comprises a shell, a refrigerant flow path device, at least one shielding cover and a refrigerant sensor. The shell is provided with a mounting cavity; the refrigerant flow path device is arranged in the mounting cavity and comprises at least one flow path, the at least one flow path comprises at least one inlet pipe and at least one outlet pipe, the at least one inlet pipe comprises a first connecting part, the first connecting part is exposed to the outer side of the shell and used for being connected with a first external refrigerant distribution pipe, and the at least one outlet pipe comprises a second connecting part; the second connecting part is exposed on the outer side of the shell and is used for being connected with a second external refrigerant pipe; the shielding cover is arranged on the outer side of the shell and is provided with a shielding cavity communicated with the mounting cavity, and the shielding cavity accommodates the first connecting part and the second connecting part; the refrigerant sensor is used for detecting the concentration of a refrigerant in at least one of the mounting cavity and the shielding cavity. According to the technical scheme, the safety of the indoor unit can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an indoor unit and a heating and ventilation system. Background Art

[0002] Indoor units are often used as indoor units in multi-split HVAC systems. A multi-split HVAC system consists of an outdoor unit, multiple indoor units, and multiple sub-piping systems connecting the indoor units and the outdoor units. The indoor unit integrates multiple control valves connected to the sub-piping systems to distribute refrigerant or switch operating modes by controlling the opening and closing of the control pipes.

[0003] Part of the sub-piping system is exposed outside the indoor unit housing to form a joint for connecting to the indoor unit. This joint connects to the pipes extending from the indoor unit. However, in some cases, refrigerant leaks can easily occur at this joint. Some refrigerants are flammable and explosive, posing a safety hazard. Utility Model Content

[0004] An embodiment of the present application provides an indoor unit that can improve the safety of a HVAC system.

[0005] The indoor unit proposed in the embodiment of the present application includes:

[0006] A housing having a mounting cavity;

[0007] A refrigerant flow path device is disposed in the mounting cavity, the refrigerant flow path device including at least one flow path, the at least one flow path including at least one inlet pipe and at least one outlet pipe, the at least one inlet pipe including a first connecting portion, the first connecting portion being exposed outside the shell and being connected to a first external refrigerant pipe, the at least one outlet pipe including a second connecting portion, the second connecting portion being exposed outside the shell and being connected to a second external refrigerant pipe;

[0008] at least one shielding cover, disposed on the outer side of the housing and having a shielding cavity communicating with the mounting cavity, the shielding cavity accommodating at least one of the first connecting portion and the second connecting portion; and

[0009] The refrigerant sensor is used to detect the refrigerant concentration in a target space, where the target space includes at least one of the installation cavity and the shielding cavity.

[0010] In one embodiment, at least one side of the shell in the circumferential direction is provided with at least one pipe opening, and the at least one inlet pipe and the at least one outlet pipe extend out of at least one side of the shell through the at least one pipe opening, forming the at least one first connecting portion and the at least one second connecting portion respectively.

[0011] The shielding cover covers the at least one pipe opening and at least one of the at least one first connecting portion and the at least one second connecting portion. The at least one pipe opening communicates with the installation cavity and the shielding cavity.

[0012] In one embodiment, at least one communication port is provided on at least one side of the circumference of the housing;

[0013] The shielding cover covers the at least one communication port, the at least one communication port is spaced apart from the at least one pipe opening, and connects the installation cavity and the shielding cavity.

[0014] In one embodiment, an exhaust system is further included, wherein the exhaust system is provided with a first exhaust channel located in the installation cavity, a first air inlet and a second air outlet connected to the first exhaust channel, and includes a fan connected to the first exhaust channel.

[0015] In one embodiment, the housing is provided with at least one second air inlet and at least one second air outlet in a circumferential direction, and the at least one second air inlet and the at least one second air outlet are spaced apart.

[0016] At least one of the shielding covers covers the at least one second air inlet and the at least one second air outlet, and at least one second exhaust channel located in the shielding cavity is defined between the at least one second air inlet and the at least one second air outlet, and the at least one second exhaust channel is connected to the first exhaust channel through the at least one second air inlet and the at least one second air outlet.

[0017] In one embodiment, the first connecting portion has a first sleeve section for sleeve connection with a first external refrigerant pipe, and the second connecting portion has a second sleeve section for sleeve connection with a second external refrigerant pipe;

[0018] The shielding cavity accommodates at least one of the first sleeve segment and the second sleeve segment.

[0019] In one embodiment, the shielding cover is sealed to the housing; and / or,

[0020] The shielding cavity is configured to accommodate at least one of a portion of the first external refrigerant pipe and a portion of the second external refrigerant pipe, and is configured to be suitable for sealing connection with at least one of a portion of the first external refrigerant pipe and a portion of the second external refrigerant pipe.

[0021] In one embodiment, a first sealing member is provided between the shielding cover and the housing, and the first sealing member is provided around a side where the shielding cover is connected to the housing to fill a gap between the shielding cover and the housing; and / or,

[0022] The shielding cover is provided with at least one pipe outlet on a side away from the shell, and the at least one pipe outlet is connected to the shielding cavity and is configured to allow at least one of the first external refrigerant pipe and the second external refrigerant pipe to pass through. A second seal is provided at the pipe outlet, and the second seal is configured to fill the gap between at least one of the first external refrigerant pipe and the second external refrigerant pipe and the shielding cover.

[0023] In one embodiment, the shielding cover is detachably connected to the housing.

[0024] In one embodiment, the shielding cover comprises:

[0025] a first cover connected to the outer side of the housing; and

[0026] The second cover shell is detachably connected to the first cover shell and is connected to the outer side of the shell body to define the shielding cavity with the first cover shell and the shell body.

[0027] In one embodiment, the first cover is sleeved with the second cover;

[0028] And / or, a first tooth structure is provided at one end of the first cover shell away from the shell, and a second tooth structure is provided at one end of the second cover shell away from the shell, the first tooth structure and the second tooth structure extend toward each other, and the first tooth structure and the second tooth structure define at least one pipe outlet, the at least one pipe outlet is connected to the shielding cavity, and is configured to allow at least one of the first external refrigerant pipe and the second external refrigerant pipe to pass through.

[0029] In one embodiment, the first connecting portion and the second connecting portion are exposed on different sides of the shell in the circumferential direction;

[0030] The indoor unit includes at least one first shielding cover and at least one second shielding cover, the at least one first shielding cover covers the first connecting portion and has a first cavity, the at least one second shielding cover covers the second connecting portion and has a second cavity, and the first cavity and the second cavity are both connected to the installation cavity.

[0031] In one embodiment, the at least one first shielding cover and the at least one second shielding cover are spaced apart, and the first cavity and the second cavity are respectively communicated with the installation cavity; or,

[0032] The at least one first shielding cover and the at least one second shielding cover are connected, and the first cavity and the second cavity are communicated with each other, and at least one of the first cavity and the second cavity is communicated with the installation cavity.

[0033] In one embodiment, the at least one first shielding cover and the at least one second shielding cover are an integral structure.

[0034] In one embodiment, the refrigerant sensor is disposed near the bottom of the housing.

[0035] The present application also provides a heating and ventilation system, including:

[0036] Outdoor unit;

[0037] Multiple indoor units; and

[0038] In any one of the above-mentioned indoor units, the outdoor unit and the plurality of indoor units are all connected to the refrigerant flow path device.

[0039] In an embodiment of the present application, a shielding cover is provided outside the shell of the indoor unit, the shielding cover is provided with a shielding cavity connected to the installation cavity, the first connection part and the second connection part of the refrigerant flow path device are provided in the shielding cavity, and the refrigerant sensor is used to detect the refrigerant concentration in the target space, and the target space includes at least one of the installation cavity and the shielding cavity, so that the refrigerant leaked at the first connection part and the second connection part can be detected by the refrigerant sensor in a timely manner, which is conducive to rapid alarm and reminder, and buys time for rapid processing of refrigerant leakage, reducing or avoiding accidents caused by refrigerant leakage. Not only that, the shielding cover can also block the refrigerant leaked at the first connection part and the second connection part, reducing or avoiding the situation where the refrigerant quickly leaks into the room, thereby being more conducive to avoiding safety accidents and further improving the safety of the indoor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0041] Figure 1 This is a structural diagram of an embodiment of the HVAC system of the present application;

[0042] Figure 2 This is a structural diagram of an embodiment of the indoor unit of the present application;

[0043] Figure 3 This is a structural diagram of another embodiment of the indoor unit of the present application;

[0044] Figure 4 This is a structural diagram of another embodiment of the indoor unit of the present application;

[0045] Figure 5 for Figure 4 Schematic diagram of the internal structure of the indoor unit;

[0046] Figure 6 Schematic diagram of the first exhaust channel and the second exhaust channel of the indoor unit.

[0047] Description of Figure Numbers:

[0048] 1000, HVAC system; 100, indoor unit; 10, housing; 10a, installation cavity; 10b, pipe opening; 10c, communication port; 10d, first exhaust duct; 10e, first air inlet; 10f, first air outlet; 10h, second air inlet; 10i, second air outlet; 30, refrigerant flow path device; 30a, first connecting portion; 30b, second connecting portion; 30a1, outdoor inlet pipe joint; 30a3, outdoor outlet pipe joint; 30b1, indoor outlet pipe joint; 31, liquid refrigerant main pipe; 311, indoor unit liquid refrigerant pipe; 33, high-pressure gas refrigerant main pipe; 331, High-pressure gaseous refrigerant secondary pipe; 35. Low-pressure gaseous refrigerant main pipe; 351. Low-pressure gaseous refrigerant secondary pipe; 353. Indoor unit gaseous refrigerant pipe; 36. Low-pressure gas control valve; 37. High-pressure gas control valve; 38. Liquid shut-off valve; 39. Gas shut-off valve; 50. Shielding cover; 50a. Shielding cavity; 50b. Outlet; 50c. First shielding cover; 50d. Second shielding cover; 50e. Third shielding cover; 50f. Second exhaust duct; 51. First cover; 511. First tooth structure; 53. Second cover; 511. Second tooth structure; 70. Refrigerant sensor; 80. Controller;

[0049] 200, outdoor unit; 300, indoor unit; 301, indoor unit; 400, refrigerant piping; 400a, first external refrigerant piping; 400b, second external refrigerant piping; 401, liquid refrigerant piping; 402, high-pressure gas refrigerant piping; 403, low-pressure gas refrigerant piping; 405, connecting gas pipe; 406, connecting liquid pipe.

[0050] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0052] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0053] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0055] Please refer to Figure 1 The present application proposes a HVAC system 1000, which includes an outdoor unit 200, multiple indoor units 301 and at least one indoor unit 100. The outdoor unit 200, multiple indoor units 301 and at least one indoor unit 100 are connected through refrigerant pipes, and the refrigerant circulates in the outdoor unit 200, multiple indoor units 301 and at least one indoor unit 100 through the refrigerant pipes.

[0056] Specifically, the outdoor unit 200 includes a compressor, a condenser, and an evaporator, among other components, for processing refrigerant. The refrigerant piping 400 includes a liquid refrigerant piping 401, a high-pressure gas refrigerant piping 402, and a low-pressure gas refrigerant piping 403, for transmitting liquid refrigerant, high-pressure gas refrigerant, and low-pressure gas refrigerant, respectively. The outdoor unit 200 is connected to at least one indoor unit 100 via the liquid refrigerant piping 401, the high-pressure gas refrigerant piping 402, and the low-pressure gas refrigerant piping 403. Optionally, when the HVAC system 1000 is provided with multiple indoor units 100, the liquid refrigerant piping 401, the high-pressure gas refrigerant piping 402, and the low-pressure gas refrigerant piping 403 are connected in series to the multiple indoor units 100. The multiple indoor units 301 can be divided into multiple indoor units 300, each of which is provided with at least two indoor units 301, and each indoor unit 300 is connected to a corresponding indoor unit 100. The refrigerant piping further includes multiple connecting air pipes 405 and multiple connecting liquid pipes 406. The indoor unit 100 is connected to the indoor unit 301 via at least one connecting air pipe 405 and one connecting liquid pipe 406. The indoor unit 301 is provided with a heat exchanger, and the connecting air pipes 405 and connecting liquid pipes 406 inside the indoor unit 301 are both connected to the heat exchanger. The indoor unit 100 can switch between high-pressure gaseous refrigerant and low-pressure gaseous refrigerant for a particular indoor unit 301, so that the indoor unit 301 can perform cooling, heating, and other operations through the heat exchanger.

[0057] In some embodiments, the outdoor unit 200 is arranged outside the building, and the indoor unit 301 and the indoor unit 100 are both arranged inside the building. When the HVAC system 1000 of the embodiment of the present application is applied to a multi-story building, one or more indoor units 300 may be arranged on each floor of the building, and one or more indoor units 100 may be arranged correspondingly, and the present application does not impose any restrictions on this. Optionally, the indoor unit 300 and the indoor unit 100 corresponding thereto are arranged on the same floor. The indoor unit 300 acts on a target space in the building to regulate the air in the target space, and the indoor unit 100 corresponding to the indoor unit 300 is arranged in an adjacent installation space to facilitate pipeline layout.

[0058] For ease of description, in this application, an up-down direction ZZ, a front-back direction YY, and a left-right direction XX are defined, and the up-down direction ZZ, the front-back direction YY, and the left-right direction XX are arranged at an angle to each other.

[0059] In some embodiments, the indoor unit 100 includes a housing 10, a refrigerant flow path device 30, a refrigerant sensor 70, and at least one shielding cover 50. The refrigerant flow path device 30 and the refrigerant sensor 70 are both disposed in the interior space of the housing 10, while the shielding cover 50 is disposed outside the housing 10.

[0060] Please refer to Figure 2 and Figure 3 , under the premise of ensuring the accommodation space, the shape of the shell 10 can be configured into any shape to adapt to the installation environment or related design, and the present application does not limit this. Optionally, the shell 10 is roughly box-shaped and has a width direction set along the front-to-back direction YY, a length direction set along the left-right direction XX, and a thickness direction set along the up-down direction ZZ. For example, the shell 10 can be set as a rectangular structure with a hollow interior. The shell 10 can be made of metal plate or flame-retardant resin plate material, which has high strength and support, can better protect the internal components, and can also play a flame retardant role in the event of combustion. An installation cavity 10a is formed inside the shell 10, and the refrigerant flow path device 30 and the refrigerant sensor 70 are both arranged in the installation cavity 10a. Exemplarily, the shell 10 includes a top plate, a bottom plate and a side panel. The top plate and the bottom plate are spaced apart in the up-down direction ZZ, and the side panel connects the top plate and the bottom plate, so that the top plate, the bottom plate and the side panel enclose the above-mentioned installation cavity 10a. Among them, the top plate, bottom plate and side panels can be connected to each other by at least one of clamping, bolting and welding. The side panels can be an integral structure or can be made up of multiple different side panels. This application does not impose any restrictions on these. The shell 10 is also provided with a pipe port 10b connected to the installation cavity 10a. The pipe port 10b can be set on any side of the top plate, bottom plate or side panel to adapt to different installation environments. The pipe port 10b is used to extend part of the structure of the refrigerant flow path device 30 to connect with the above-mentioned liquid refrigerant pipe 401, high-pressure gas refrigerant pipe 402, low-pressure gas refrigerant pipe 403, connecting air pipe 405 and connecting liquid pipe 406.

[0061] like Figure 2 As shown, the refrigerant flow path device 30 is configured to transport refrigerant. Specifically, the refrigerant flow path device 30 includes at least one flow path, which includes at least one inlet pipe and at least one outlet pipe. The at least one inlet pipe includes a first connecting portion 30a, which is exposed outside the housing 10 and is connected to a first external refrigerant pipe 400a. The at least one outlet pipe includes a second connecting portion 30b, which is exposed outside the housing and is connected to a second external refrigerant pipe 400b.

[0062] Exemplarily, the flow path includes a liquid refrigerant main pipe 31, a high-pressure gas refrigerant main pipe 33 and a low-pressure gas refrigerant main pipe 35. At least one end of the liquid refrigerant main pipe 31, the high-pressure gas refrigerant main pipe 33 and the low-pressure gas refrigerant main pipe 35 passes through the corresponding pipe opening 10b to the outside of the shell 10 and forms a first connection part 30a. The first connection part 30a can be connected to the liquid refrigerant pipe 401, the high-pressure gas refrigerant pipe 402 and the low-pressure gas refrigerant pipe 403 respectively by welding, wherein the liquid refrigerant pipe 401, the high-pressure gas refrigerant pipe 402 and the low-pressure gas refrigerant pipe 403 are the first external refrigerant pipe 400a. Furthermore, the liquid refrigerant main pipe 31 branches into a plurality of indoor unit liquid refrigerant pipes 311, the high-pressure gas refrigerant main pipe 33 branches into a plurality of high-pressure gas refrigerant secondary pipes 331, and the low-pressure gas refrigerant main pipe 35 branches into a plurality of low-pressure gas refrigerant secondary pipes 351. Optionally, the refrigerant flow path device 30 also includes a plurality of indoor unit gas refrigerant pipes 353, each of which is connected to a high-pressure gas refrigerant secondary pipe 331 and a low-pressure gas refrigerant secondary pipe 351. One end of each of the plurality of indoor unit liquid refrigerant pipes 311 and the plurality of indoor unit gas refrigerant pipes 353 extends outside the housing 10 through corresponding pipe openings 10b, forming a second connecting portion 30b. These can be connected to the plurality of connecting liquid pipes 406 and the plurality of connecting gas pipes 405, respectively, by welding. The plurality of connecting liquid pipes 406 and the plurality of connecting gas pipes 405 constitute the second external refrigerant piping 400b.

[0063] The refrigerant flow path device 30 also includes a plurality of low-pressure gas control valves 36, a plurality of high-pressure gas control valves 37, a plurality of liquid shutoff valves 38, and a plurality of gas shutoff valves 39. The low-pressure gas control valves 36 are disposed in the low-pressure gaseous refrigerant secondary pipes 351 and can be switched between an open state and a closed state to allow or block the flow of refrigerant between the low-pressure gaseous refrigerant secondary pipes 351 and the corresponding indoor unit gaseous refrigerant pipes 353. The high-pressure gas control valves 37 are disposed in the high-pressure gaseous refrigerant secondary pipes 331 and can be switched between an open state and a closed state to allow or block the flow of refrigerant between the high-pressure gaseous refrigerant secondary pipes 331 and the corresponding indoor unit gaseous refrigerant pipes 353. Liquid shutoff valves 38 are respectively disposed in the indoor unit liquid refrigerant pipes 311, and gas shutoff valves 39 are respectively disposed in the indoor unit gaseous refrigerant pipes 353. These valves can be switched between an open state and a closed state to respectively allow or cut off the flow of refrigerant between the indoor unit liquid refrigerant pipes 311 and the corresponding connecting liquid pipes 406, and between the indoor unit gaseous refrigerant pipes 353 and the corresponding connecting gas pipes 405. It will be appreciated that the low-pressure gas control valve 36, the high-pressure gas control valve 37, the liquid shutoff valve 38, and the gas shutoff valve 39 may be electric valves or expansion valves.

[0064] As previously mentioned, the portion of the refrigerant flow path device 30 that extends outside the housing 10 is formed into a first connecting portion 30a and a second connecting portion 30b. The first connecting portion 30a and the second connecting portion 30b are connected to the first external refrigerant pipe 400a and the second external refrigerant pipe 400b. However, in some cases, refrigerant leakage may occur at these connections. Some refrigerants are flammable and explosive, posing a safety hazard.

[0065] Please refer to Figure 3 and Figure 4 , the embodiment of the present application is provided with a shielding cover 50 that is arranged on the outside of the shell 10. The shielding cover 50 is used to shield at least one of the first connecting portion 30a and the second connecting portion 30b that extend out of the shell 10. Its shape can be configured into any shape to adapt to the installation environment or related design, and the present application is not limited to this. Optionally, the shielding cover 50 is roughly box-shaped. For example, the shielding cover 50 can be arranged into a rectangular structure with a hollow interior. The shielding cover 50 can be made of materials such as metal plates, plastics or flame-retardant resin plates, so as to have higher strength, support and good flame retardant properties.

[0066] Combine Figures 3 to 5 The shielding cover 50 is provided with a shielding cavity 50a, the first connecting portion 30a and the second connecting portion 30b are located in the shielding cavity 50a, and the shielding cavity 50a is connected to the installation cavity 10a. Optionally, the shielding cover 50 and the shell 10 can be spaced apart, and the shielding cavity 50a and the installation cavity 10a are connected through a connecting pipe therebetween; or, the shielding cavity 50a is provided with an opening on one side, and the side of the shielding cover 50 provided with the above-mentioned opening is connected to the outer side of the shell 10, and the shielding cavity 50a and the installation cavity 10a can be connected through a through hole on the shell 10. It can be understood that when the first connecting portion 30a and the second connecting portion 30b are connected to the first external refrigerant pipe 400a and the second external refrigerant pipe 400b, the first external refrigerant pipe 400a and the second external refrigerant pipe 400b are also located in the shielding cavity 50a.

[0067] The refrigerant sensor 70 is used to detect the refrigerant concentration within a target space, which includes at least one of the installation cavity 10a and the shielded cavity 50a. For example, the indoor unit 100 may be provided with the refrigerant sensor 70 within the installation cavity 10a. In this case, the refrigerant sensor 70 can detect the refrigerant within the installation cavity 10a. If a refrigerant leak occurs at the first connection portion 30a and the second connection portion 30b, since the shielded cavity 50a and the installation cavity 10a are connected, the refrigerant will flow into the installation cavity 10a and be detected by the refrigerant sensor 70. The indoor unit 100 may also be provided with the refrigerant sensor 70 within the shielded cavity 50a. In this case, refrigerant leaks from the first connection portion 30a and the second connection portion 30b can be directly detected by the refrigerant sensor 70. Of course, the refrigerant sensor 70 may also be provided within both the shielded cavity 50a and the installation cavity 10a, allowing for timely detection of refrigerant in both the shielded cavity 50a and the installation cavity 10a.

[0068] Thus, in the embodiment of the present application, a shielding cover 50 is disposed outside the housing 10 of the indoor unit 100, the shielding cover 50 defines a shielding chamber 50a that communicates with the mounting chamber 10a, the first connection portion 30a and the second connection portion 30b of the refrigerant flow path device 30 are disposed within the shielding chamber 50a, and the refrigerant sensor 70 is configured to detect the refrigerant concentration within a target space, the target space including at least one of the mounting chamber 10a and the shielding chamber 50a. This allows refrigerant leaks from the first connection portion 30a and the second connection portion 30b to be promptly detected by the refrigerant sensor 70, facilitating a rapid alarm and notification, thereby buying time for quickly addressing the refrigerant leak and reducing or avoiding accidents caused by the refrigerant leak. Furthermore, the shielding cover 50 can also block refrigerant leaks from the first connection portion 30a and the second connection portion 30b, reducing or preventing rapid refrigerant leakage into the room, thereby further preventing safety accidents and further improving the safety of the indoor unit 100.

[0069] The indoor unit 100 also includes a controller 80, which is electrically connected to the refrigerant sensor 70 and the aforementioned low-pressure gas control valve 36, high-pressure gas control valve 37, liquid shutoff valve 38, and gas shutoff valve 39, for receiving signals and performing related controls. The refrigerant sensor 70 can detect the refrigerant concentration in the installation cavity 10a and the shielded cavity 50a and continuously or periodically transmit a detection signal corresponding to the detected refrigerant concentration to the controller 80. After receiving the detection signal, the controller 80 can determine whether a refrigerant leak has occurred within the cavity based on the detection value of the refrigerant sensor 70.

[0070] Please refer to Figure 5In some embodiments of the present application, the controller 80 is arranged on one side of the refrigerant flow path device 30, and the refrigerant sensor 70 can be arranged close to the shielding cover 50 to make the detection more timely; or, the refrigerant sensor 70 and the controller 80 are connected by wire and arranged close to the controller 80 to shorten the connection line between the refrigerant sensor 70 and the controller 80, effectively slowing down the aging of the line. Furthermore, since the density of the refrigerant is greater than the density of the air, the refrigerant tends to sink to the lower part of the chamber when it leaks. In one embodiment, the refrigerant sensor 70 is arranged close to the bottom of the shell 10, that is, the refrigerant sensor 70 is arranged at the lower part of the shell 10 along the up-down direction ZZ. As a result, the leaked refrigerant can be detected by the refrigerant sensor 70 more quickly, further shortening the detection time and improving the detection sensitivity of the refrigerant sensor 70.

[0071] Please refer again Figure 3 At least one side of the housing 10 is provided with a pipe opening 10b. For example, there are multiple pipe openings 10b, including an outdoor pipe inlet, an outdoor pipe outlet, and an indoor pipe outlet. The outdoor pipe inlet and the outdoor pipe outlet are provided on both sides of the housing 10 along its width (front-to-back direction YY), while the indoor pipe outlet is provided on one side of the housing 10 along its length (left-to-right direction XX). It is understood that there are at least three outdoor inlet and outlet openings, respectively. The ends of the aforementioned liquid refrigerant main pipe 31, high-pressure gas refrigerant main pipe 33, and low-pressure gas refrigerant main pipe 35 extend through the outdoor inlet and outlet openings, respectively. The pipe portion extending through the outdoor inlet forms an outdoor inlet joint 30a1, while the pipe portion extending through the outdoor outlet forms an outdoor outlet joint 30a3. The aforementioned indoor unit liquid refrigerant pipe 311 and indoor unit gas refrigerant pipe 353 extend through the indoor outlet opening, forming an indoor outlet joint 30b1. The outdoor inlet joint 30a1, outdoor outlet joint 30a3, and indoor outlet joint 30b1 each form a first connecting portion 30a or a second connecting portion 30b.

[0072] In one embodiment of the present application, when the shielding cover 50 is connected to the housing 10, at least the shielding covers the outdoor pipe inlet, outdoor pipe outlet and the pipe opening 10b portion of the indoor pipe outlet to prevent the refrigerant from leaking from the pipe opening 10b. Figure 5In this embodiment, a refrigerant sensor 70 is provided in the installation cavity 10a, and a gap is formed between the wall of the pipe opening 10b formed by the shell 10 and the portion of the pipeline passing through the pipe opening 10b, and the shielding cavity 50a and the installation cavity 10a can be connected through the gap. For example, the pipe opening 10b is arranged in a circular shape, and the pipeline passing through the pipe opening 10b is a cylindrical pipeline. The inner diameter of the pipe opening 10b is larger than the outer diameter of the pipeline, so that the above-mentioned gap can be formed between the two. In the embodiment of the present application, the shielding cavity 50a and the installation cavity 10a are connected through the pipe opening 10b. The refrigerant leaked at the first connecting portion 30a or the second connecting portion 30b can enter the installation cavity 10a along the pipeline through the pipe opening 10b without the need for additional openings in the shell 10. The structure is relatively simple and easy to implement, thereby improving production efficiency.

[0073] like Figure 5 As shown, in another embodiment of the present application, the housing 10 further includes a communication port 10c connecting the installation chamber 10a and the shielding chamber 50a. In this embodiment, the shielding cover 50 is disposed on the outside of the housing 10, and the communication port 10c is disposed on the side of the housing 10 near the shielding cover 50. For example, the shielding cover 50 shields the outdoor pipe inlet, outdoor pipe outlet, and indoor pipe outlet. The housing 10 includes at least three communication ports 10c, located on the same side of the outdoor pipe inlet, outdoor pipe outlet, and indoor pipe outlet, to fully ensure airflow between various parts of the shielding cover 50 and the installation chamber 10a. It is understood that the shape of the communication port 10c is not limited and can be square or circular, for example. The communication port 10c is spaced apart from the aforementioned pipe port 10b, increasing the flow area between the shielding chamber 50a and the installation chamber 10a, allowing refrigerant to quickly enter the installation chamber 10a from the shielding chamber 50a, facilitating detection by the refrigerant sensor 70 within the installation chamber 10a.

[0074] Further, refer to Figure 6 In one embodiment, the indoor unit 100 is further provided with an exhaust system. The exhaust system includes a first exhaust passage 10d located in the installation cavity 10 and a first air inlet 10e and a first air outlet 10f communicating with the first exhaust passage 10d. The first air inlet 10e and the first air outlet 10f are provided on the housing 10. The exhaust system further includes a fan communicating with the first exhaust passage 10d. When the fan is in operation, air can enter the first exhaust passage 10d from the first air inlet 10e and be discharged from the first air outlet 10f, thereby ventilating the installation cavity 10a.

[0075] The shell 10 is circumferentially provided with at least one second air inlet 10h and at least one second air outlet 10i. The second air inlet 10h and the second air outlet 10i can be formed by a connecting port 10c or a pipe port 10b. The at least one second air inlet 10h and the at least one second air outlet 10i are arranged at intervals. At least one shielding cover 50 covers the at least one second air inlet 10h and the at least one second air outlet 10i. At least one second exhaust channel 50f located in the shielding cavity is defined between the at least one second air inlet 10h and the at least one second air outlet 10i. The at least one second exhaust channel 50f is connected to the first exhaust channel 10d through the at least one second air inlet 10h and the at least one second air outlet 10i. In this way, when the fan is running, the air flow can also enter the second exhaust channel 50f from the second air inlet 10h, flow out from the second air outlet 10i, and then be discharged from the first air outlet 10f. In this way, the refrigerant in the shielding cavity 50a can be discharged, making the exhaust more thorough and reducing safety hazards.

[0076] In some embodiments, the shielding cover 50 is detachably connected to the housing 10. The shielding cover 50 may be provided with a pipe outlet 50b, which is connected to the shielding cavity 50a. When the indoor unit 100 is installed, the first external refrigerant pipe 400a and the second external refrigerant pipe 400b may be connected to the first connecting portion 30a or the second connecting portion 30b respectively, and then the shielding cover 50 is connected to the housing 10. This facilitates the assembly of the indoor unit 100 and is more efficient. The shielding cover 50 and the housing 10 may be detachably connected by means of buckles, bolts, etc., which not only improves assembly efficiency, but also allows the shielding cover 50 to be removed for maintenance and is convenient for replacement of the shielding cover 50.

[0077] Exemplarily, the first connecting portion 30a has a first socket section for socketing with the first external refrigerant piping 400a, and the second connecting portion 30b has a second socket section for socketing with the second external refrigerant piping 400b, and the shielding cavity 50a accommodates at least one of the first socket section and the second socket section, thereby preventing the refrigerant leaking from the first socket section and the second socket section from flowing directly to the environment outside the installation cavity 10a and the shielding cavity 10a, and facilitating the leakage of the refrigerant to be detected by the refrigerant sensor 70.

[0078] like Figure 4 and Figure 5As shown, the shielding cover 50 optionally includes a first cover shell 51 and a second cover shell 53. The present application does not limit the arrangement of the first cover shell 51 and the second cover shell 53. The first cover shell 51 and the second cover shell 53 can be arranged in the vertical direction ZZ or the front-back direction YY. The first cover shell 51 is connected to the outside of the housing 10. The ends of the first cover shell 51 are detachably connected to the housing 10 using a snap-fit or bolted connection, facilitating assembly and disassembly of the first cover shell 51. The first cover shell 51 is opened toward the second cover shell 53. The second cover shell 53 is detachably connected to the first cover shell 51 and connected to the outside of the housing 10 to define a shielding chamber 50a with the first cover shell 51 and the housing 10. By providing a detachably connected first and second cover shells 51, 53, the shielding cover 50 can be installed in sections, providing greater flexibility during assembly. The first and second cover shells 51, 53 can be replaced individually, and for maintenance, only the first cover shell 51 or the second cover 53 can be removed, improving efficiency.

[0079] In a specific embodiment, the first shell 51 and the second shell 53 are sleeved. For example, the opening of the first shell 51 toward the second shell 53 is larger than the outer contour of the second shell 53. After the first shell 51 is connected to the housing 10, the second shell 53 can be directly nested in the first shell 51 to form a shielding cover 50. Of course, the second shell 53 can also be sleeved outside the first shell 51, and there is no limitation to this. The embodiment of the present application adopts a sleeve-type connection to connect the first shell 51 and the second shell 53. On the one hand, it makes the connection between the first shell 51 and the second shell 53 more convenient and quick. On the other hand, the sleeved shell can further prevent the leakage of the refrigerant.

[0080] Optionally, the pipe outlet 50b may be provided on the first cover shell 51 or the second cover shell 53; or, the pipe outlet 50b may also be formed by the first cover shell 51 and the second cover shell 53. Exemplarily, the pipe outlet 50b is provided at the end of the shielding cover 50 away from the housing 10. A first tooth structure 511 is provided at the end of the first cover shell 51 away from the housing 10, and a second tooth structure 511 is provided at the end of the second cover shell 53 away from the housing 10. The first tooth structure 511 and the second tooth structure 511 extend toward each other. For example, if the first cover shell 51 and the second cover shell 53 are arranged along the vertical direction ZZ, then the first tooth structure 511 and the second tooth structure 511 extend along the vertical direction ZZ, or if the first cover shell 51 and the second cover shell 53 are arranged along the front-to-back direction YY, then the first tooth structure 511 and the second tooth structure 511 extend along the front-to-back direction YY. Continuing with the example of the first and second housings 51, 53 arranged along the vertical direction ZZ, when the first and second housings 51, 53 are connected, the raised portions of the first and second tooth structures 511, 511 abut against each other vertically, while the recessed portions of the first and second tooth structures 511, 511 connect to form outlets 50b. Multiple outlets 50b are arranged at intervals along the direction of the convex-concave changes in the first and second tooth structures 511, 511. The outlets 50b communicate with the shielding cavity 50a and are configured to allow the refrigerant piping 400 to pass through. In this manner, when assembling the indoor unit 100, the first and second housings 51, 53 can be connected radially along the pipeline. Compared to the method of fitting the shielding cover 50 axially along the pipeline, this method not only saves space but also facilitates installation, thereby improving installation efficiency.

[0081] Furthermore, when the first cover shell 51 and the second cover shell 53 are socketed, the use of the first tooth structure 511 and the second tooth structure 511 to form the pipe outlet 50b can not only further improve the convenience of installation, but also allow the first tooth structure 511 and the second tooth structure 511 to be staggered to construct pipe outlets 50b of different sizes, making the installation method more flexible.

[0082] In some embodiments, the shielding cover 50 is sealedly connected to the shell 10, so that the refrigerant leaked at the first connection part 30a and the second connection part 30b can be prevented from flowing out from between the shielding cover 50 and the shell 10. This not only allows more refrigerant to enter the installation cavity 10a and be quickly detected by the refrigerant sensor 70 in the installation cavity 10a, but also reduces or avoids the flow of refrigerant into the room, thereby improving the safety factor and avoiding safety accidents.

[0083] Optionally, a first seal is provided between the shielding cover 50 and the shell 10, and the first seal is provided around one side where the shielding cover 50 is connected to the shell 10. The first seal can be optionally a rubber gasket, and the shielding cover 50 and the shell 10 are connected to two opposite surfaces of the rubber gasket, so that the first seal fills the gap between the shielding cover 50 and the shell 10 and blocks the refrigerant from flowing out of the gap between the shielding cover 50 and the shell 10. The use of the first seal provided between the shielding cover 50 and the shell 10 not only achieves the sealing effect between the shielding cover 50 and the shell 10, but also facilitates production and assembly, helps to improve production and assembly efficiency, and reduces costs. In other embodiments, sealant can also be applied to the connection between the shielding cover 50 and the shell 10 to achieve the purpose of a sealed connection.

[0084] Because the first connection portion 30a and the second connection portion 30b are located within the shielding cavity 50a, the first external refrigerant pipe 400a and the second external refrigerant pipe 400b in the refrigerant piping 400, such as the connecting air pipe 405 and the connecting liquid pipe 406, need to extend through the outlet 50b portion and into the shielding cavity 50a. In some embodiments, the shielding cover 50 is configured to be sealed with the first external refrigerant pipe 400a and the second external refrigerant pipe 400b. This prevents refrigerant leaking from the first connection portion 30a and the second connection portion 30b from flowing out through the gap between the shielding cover 50 and the first external refrigerant pipe 400a and the second external refrigerant pipe 400b, allowing more refrigerant to enter the installation cavity 10a and be quickly detected by the refrigerant sensor 70 within the installation cavity 10a. This also reduces or prevents the flow of refrigerant into the room, thereby improving the safety factor and avoiding safety accidents.

[0085] Optionally, a second sealing member is provided at the pipe outlet 50b. The second sealing member may be a rubber ring that can be sleeved on the first external refrigerant pipe 400a and the second external refrigerant pipe 400b and filled at the pipe outlet 50b to fill the gap between the first external refrigerant pipe 400a, the second external refrigerant pipe 400b and the shielding cover 50, thereby preventing the refrigerant from flowing out of the gap between the first external refrigerant pipe 400a, the second external refrigerant pipe 400b and the shielding cover 50. The first sealing member provided between the shielding cover 50 and the first external refrigerant pipe 400a, the second external refrigerant pipe 400b, and the shielding cover 50 not only achieves a sealing effect between the shielding cover 50 and the first external refrigerant pipe 400a, the second external refrigerant pipe 400b, but also facilitates production and assembly, thereby improving production and assembly efficiency and reducing costs. Similarly, in other embodiments, sealant may be applied to the connection between the shielding cover 50 and the first external refrigerant pipe 400 a and the second external refrigerant pipe 400 b to achieve a sealed connection.

[0086] Please refer to Figure 3In a specific embodiment of the present application, the refrigerant flow path device 30 includes an outdoor inlet pipe joint 30a1, an outdoor outlet pipe joint 30a3, and an indoor outlet pipe joint 30b1. The outdoor inlet pipe joint 30a1 and the outdoor outlet pipe joint 30a3 are configured with at least one first connection portion 30a and are exposed on both sides of the housing 10 along the width direction (front-to-back direction YY). The indoor outlet pipe joint 30b1 is configured with at least one second connection portion 30b and is exposed on one side of the housing 10 along the length direction (left-to-right direction XX). The indoor unit 100 includes a first shielding cover 50c, a second shielding cover 50d, and a third shielding cover 50e. The shielding chamber 50a includes a first chamber, a second chamber, and a third chamber. Among them, the first shielding cover 50c shields the outdoor inlet pipe joint 30a1 and has a first chamber, the second shielding cover 50d shields the outdoor outlet pipe joint 30a3 and has a second chamber, and the third shielding cover 50e shields the indoor outlet pipe joint 30b1 and has a third chamber.

[0087] In this embodiment, the liquid refrigerant main pipe 31, the high-pressure gas refrigerant main pipe 33, and the low-pressure gas refrigerant main pipe 35 are arranged along the left-right direction XX. The outdoor pipe inlet connector 30a1 and the outdoor pipe outlet connector 30a3 each have three first connection portions 30a corresponding to the ends of the liquid refrigerant main pipe 31, the high-pressure gas refrigerant main pipe 33, and the low-pressure gas refrigerant main pipe 35, respectively. The multiple indoor pipe outlet connectors 30b1 have multiple second connection portions 30b corresponding to the multiple connecting air pipes 405 and the connecting liquid pipes 406. For easy identification, the multiple indoor pipe outlet connectors 30b1 are arranged in two rows in the vertical direction ZZ, respectively connected to the multiple connecting air pipes 405 and the connecting liquid pipes 406.

[0088] The embodiment of the present application can fully shield the outdoor inlet pipe joint 30a1, the outdoor outlet pipe joint 30a3 and the indoor outlet pipe joint 30b1 by setting a first shielding cover 50c, a second shielding cover 50d and a third shielding cover 50e, so as to reduce the outflow of refrigerant and enable the refrigerant to quickly enter the installation cavity 10a so as to be detected by the refrigerant sensor 70 in the installation cavity 10a.

[0089] like Figure 4As shown, in one embodiment, the first shielding cover 50c, the second shielding cover 50d, and the third shielding cover 50e are three independent shielding bodies. At least three outdoor inlet pipe joints 30a1 and at least three outdoor outlet pipe joints 30a3 are arranged along the vertical direction ZZ. The first shielding cover 50c and the second shielding cover 50d are formed into rectangular shielding bodies having a length along the vertical direction ZZ to shield the at least three outdoor inlet pipe joints 30a1 and at least three outdoor outlet pipe joints 30a3. Multiple indoor outlet pipe joints 30b1 are arranged along the left-right direction XX. The third shielding cover 50e is formed into a rectangular shielding body having a length along the left-right direction XX to shield the multiple indoor outlet pipe joints 30b1. In this embodiment, the first chamber, the second chamber, and the third chamber are respectively connected to the installation chamber 10a. For example, at least three communication ports 10c can be provided on each of the three side surfaces of the housing 10. In this way, the first shielding cover 50c, the second shielding cover 50d and the third shielding cover 50e can specifically shield the first connecting part 30a and the second connecting part 30b, and can be installed and removed separately. The installation method is flexible and convenient for targeted maintenance and replacement of the cover.

[0090] Alternatively, in other embodiments, the first shielding cover 50c, the second shielding cover 50d, and the third shielding cover 50e are connected, and the first chamber, the second chamber, and the third chamber are in communication. In this embodiment, the first chamber, the second chamber, and the third chamber form an integral shielding chamber 50a, which can be connected to the installation chamber 10a through a common communication port 10c. Regardless of whether a refrigerant leak occurs in any chamber, it can be detected by the refrigerant sensor 70 in the installation chamber 10a.

[0091] Furthermore, the first shielding cover 50c, the second shielding cover 50d and the third shielding cover 50e are an integrated structure. The shielding cover 50 has good structural integrity, is easy to process and manufacture, and has high production efficiency.

[0092] It can be understood that, as mentioned above, the controller 80 is electrically connected to the refrigerant sensor 70 and the above-mentioned low-pressure gas control valve 36, high-pressure gas control valve 37, liquid shut-off valve 38, gas shut-off valve 39, etc. After receiving the detection signal from the refrigerant sensor 70, the controller 80 can determine whether a refrigerant leakage has occurred in the cavity based on the detection value of the refrigerant sensor 70. If the controller 80 determines that a refrigerant leakage has occurred, the controller 80 can control the liquid shut-off valve 38 and the gas shut-off valve 39 to shut off and prevent the refrigerant from circulating. In addition, the indoor unit 100 can also be provided with an exhaust port, and the installation cavity 10a is connected to the external exhaust pipe through the exhaust port to discharge the refrigerant in the installation cavity 10a and the shielding cavity 50a in time to avoid safety hazards.

[0093] The above is a specific implementation of the indoor unit 100 of the embodiment of the present application. It can be understood that since the HVAC system 1000 of the embodiment of the present application adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0094] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0095] The above are only 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 principles of the present application should be included in the scope of protection of the present application.

Claims

1. An indoor unit, characterized in that: include: A housing having a mounting cavity; A refrigerant flow path device is disposed in the mounting cavity, the refrigerant flow path device including at least one flow path, the at least one flow path including at least one inlet pipe and at least one outlet pipe, the at least one inlet pipe including a first connecting portion, the first connecting portion being exposed outside the shell and being connected to a first external refrigerant pipe, the at least one outlet pipe including a second connecting portion, the second connecting portion being exposed outside the shell and being connected to a second external refrigerant pipe; at least one shielding cover, disposed on the outer side of the housing and having a shielding cavity communicating with the mounting cavity, the shielding cavity accommodating at least one of the first connecting portion and the second connecting portion; and The refrigerant sensor is used to detect the refrigerant concentration in a target space, where the target space includes at least one of the installation cavity and the shielding cavity.

2. The indoor unit according to claim 1, wherein At least one side of the shell in the circumferential direction is provided with at least one pipe opening, and the at least one inlet pipe and the at least one outlet pipe extend out of at least one side of the shell through the at least one pipe opening, respectively forming at least one first connecting portion and at least one second connecting portion; The shielding cover covers the at least one pipe opening and at least one of the at least one first connecting portion and the at least one second connecting portion. The at least one pipe opening communicates with the installation cavity and the shielding cavity.

3. The indoor unit according to claim 2, wherein At least one communication port is provided on at least one side of the shell in the circumferential direction; The shielding cover covers the at least one communication port, the at least one communication port is spaced apart from the at least one pipe opening, and connects the installation cavity and the shielding cavity.

4. The indoor unit according to claim 1, wherein It also includes an exhaust system, which is provided with a first exhaust channel located in the installation cavity, a first air inlet and a second air outlet connected to the first exhaust channel, and includes a fan connected to the first exhaust channel.

5. The indoor unit according to claim 4, wherein At least one second air inlet and at least one second air outlet are provided on the circumference of the shell, and the at least one second air inlet and the at least one second air outlet are arranged at intervals; At least one of the shielding covers covers the at least one second air inlet and the at least one second air outlet, and at least one second exhaust channel located in the shielding cavity is defined between the at least one second air inlet and the at least one second air outlet, and the at least one second exhaust channel is connected to the first exhaust channel through the at least one second air inlet and the at least one second air outlet.

6. The indoor unit according to claim 1, wherein The first connecting portion has a first sleeve section for sleeve connection with a first external refrigerant pipe, and the second connecting portion has a second sleeve section for sleeve connection with a second external refrigerant pipe; The shielding cavity accommodates at least one of the first sleeve segment and the second sleeve segment.

7. The indoor unit according to claim 1, wherein The shielding cover is sealed to the housing; and / or, The shielding cavity is configured to accommodate at least one of a portion of the first external refrigerant pipe and a portion of the second external refrigerant pipe, and is configured to be suitable for sealing connection with at least one of a portion of the first external refrigerant pipe and a portion of the second external refrigerant pipe.

8. The indoor unit according to claim 1, wherein A first sealing member is provided between the shielding cover and the housing, and the first sealing member is provided around a side where the shielding cover is connected to the housing to fill a gap between the shielding cover and the housing; and / or, The shielding cover is provided with at least one pipe outlet on a side away from the shell, and the at least one pipe outlet is connected to the shielding cavity and is configured to allow at least one of the first external refrigerant pipe and the second external refrigerant pipe to pass through. A second seal is provided at the pipe outlet, and the second seal is configured to fill the gap between at least one of the first external refrigerant pipe and the second external refrigerant pipe and the shielding cover.

9. The indoor unit according to claim 1, wherein The shielding cover is detachably connected to the shell.

10. The indoor unit according to claim 1, wherein The shielding cover comprises: a first cover connected to the outer side of the housing; and The second cover shell is detachably connected to the first cover shell and is connected to the outer side of the shell body to define the shielding cavity with the first cover shell and the shell body.

11. The indoor unit according to claim 10, wherein The first cover shell is sleeved with the second cover shell; And / or, a first tooth structure is provided at one end of the first cover shell away from the shell, and a second tooth structure is provided at one end of the second cover shell away from the shell, the first tooth structure and the second tooth structure extend toward each other, and the first tooth structure and the second tooth structure define at least one pipe outlet, the at least one pipe outlet is connected to the shielding cavity, and is configured to allow at least one of the first external refrigerant pipe and the second external refrigerant pipe to pass through.

12. The indoor unit according to any one of claims 1 to 11, wherein: The first connecting portion and the second connecting portion are exposed on different sides of the shell in the circumferential direction; The indoor unit includes at least one first shielding cover and at least one second shielding cover, the at least one first shielding cover covers the first connecting portion and has a first cavity, the at least one second shielding cover covers the second connecting portion and has a second cavity, and the first cavity and the second cavity are both connected to the installation cavity.

13. The indoor unit according to claim 12, wherein The at least one first shielding cover and the at least one second shielding cover are spaced apart, and the first cavity and the second cavity are respectively communicated with the installation cavity; or, The at least one first shielding cover and the at least one second shielding cover are connected, and the first cavity and the second cavity are communicated with each other, and at least one of the first cavity and the second cavity is communicated with the installation cavity.

14. The indoor unit according to claim 12, wherein The at least one first shielding cover and the at least one second shielding cover are an integrated structure.

15. The indoor unit according to any one of claims 1 to 11, wherein The refrigerant sensor is arranged close to the bottom of the shell.

16. A heating and ventilation system, characterized in that: include: Outdoor unit; Multiple indoor units; as well as The indoor unit according to any one of claims 1 to 15, wherein the outdoor unit and the plurality of indoor units are all connected to the refrigerant flow path device.

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