Duct type air conditioner

Abstract

The invention provides a duct type air conditioner. The duct type air conditioner comprises a shell; the indoor heat exchanger is arranged in the machine shell; the refrigerant input pipe and the refrigerant output pipe are connected with an input port and an output port of the indoor heat exchanger respectively, and the ends, away from the indoor heat exchanger, of the refrigerant input pipe and the refrigerant output pipe are provided with piping joints; the piping joint is positioned outside the shell and is connected with the indoor and outdoor unit connecting pipe; the backflow part is arranged on the piping joint and the indoor and outdoor unit connecting pipe in a sleeving mode so that the connecting portion of the piping joint and the indoor and outdoor unit connecting pipe can be sealed in the backflow part, and the inner space of the backflow part communicates with the inner space of the machine shell so that the refrigerant leaked into the backflow part can be guided into the machine shell; the anti-condensation piece is arranged on the backflow piece and the indoor and outdoor unit connecting pipe in a sleeving mode; and the refrigerant detection sensor is arranged in the shell. According to the scheme, air pipe machine refrigerant leakage can be detected in time, and therefore the use risk is reduced; the leaked refrigerant can smoothly flow back into the machine shell; and the backflow piece does not interfere with the anti-condensation piece, so that the sealing performance is better, and the anti-condensation effect is better.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of air conditioning technology, and specifically refers to a duct air conditioner. Background Art

[0002] At present, refrigerant leakage may occur during the use of ducted air conditioners. After a period of time, the concentration of the leaked refrigerant is high, and some refrigerants are flammable, resulting in the risk of flammability and explosion. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a duct air conditioner which can detect refrigerant leakage in a timely manner, thereby reducing the risk of flammability and explosion caused by refrigerant leakage in the duct air conditioner.

[0004] To this end, an embodiment of the present application provides a duct air conditioner, comprising: a casing; an indoor heat exchanger, arranged in the casing; a refrigerant input pipe and a refrigerant output pipe, respectively connected to the input port and the output port of the indoor heat exchanger, and a pipe joint is provided at one end away from the indoor heat exchanger; the pipe joint is located outside the casing, and is configured to be connected to the indoor and outdoor unit connecting pipes located outside the casing; a return piece, sleeved on the pipe joint and the indoor and outdoor unit connecting pipes, so as to seal the connection part between the pipe joint and the indoor and outdoor unit connecting pipes in the return piece, and the internal space of the return piece is connected to the internal space of the casing, so as to guide the refrigerant leaked into the return piece into the casing; an anti-condensation piece, sleeved on the return piece and the indoor and outdoor unit connecting pipes; and a refrigerant detection sensor, arranged in the casing.

[0005] The duct air conditioner provided in the embodiment of the present application is provided with a refrigerant detection sensor in the casing to detect leaked refrigerant. Since the leaked refrigerant is usually in a gaseous state, the refrigerant leaked in the casing can be detected by the refrigerant detection sensor co-located in the casing. The refrigerant leaked outside the casing can enter the casing through the reflux component, so the refrigerant leaked outside the casing can also be detected by the refrigerant detection sensor. In this way, the duct air conditioner only needs to be provided with one refrigerant detection sensor to detect refrigerant leakage of the entire machine, effectively reducing the risk of flammability and explosion caused by refrigerant leakage of the duct air conditioner, and a smaller number of refrigerant detection sensors can be used to detect refrigerant leakage of the entire machine, which is conducive to simplifying the structure of the duct air conditioner and reducing production costs.

[0006] In addition, the return piece is mounted on the pipe joint and the connecting pipe between the internal and external units to form an airflow space (i.e., the following flow guide path) for guiding the refrigerant leaking from the outside of the casing to the inside of the casing. Compared with the scheme of digging out part of the material in the anti-condensation piece to form the flow guide path or digging out part of the material in the anti-condensation piece and inserting a pipe component in the anti-condensation piece to form the flow guide path, the anti-condensation piece in this scheme is located outside the return piece, and the return piece needs to be first mounted on the pipe joint and the connecting pipe between the internal and external units, and then the anti-condensation piece is mounted. In this way, the installation and use of the return piece does not depend on the anti-condensation piece, and it is convenient to reasonably set the shape and size of the return piece according to needs, which is conducive to the smooth return of the leaked refrigerant to the casing, thereby improving the detection sensitivity of the refrigerant detection sensor to the leaked refrigerant; and the return piece will not interfere with the anti-condensation piece, and the sealing is better, and the anti-condensation effect is better.

[0007] Based on the above technical solution, the present application can also be improved as follows.

[0008] In an exemplary embodiment, the return component includes two return pipes, and the two return pipes are respectively sleeved on two corresponding pipe joints and internal and external machine connecting pipes; the anti-condensation component is fixedly matched with the return pipe.

[0009] In an exemplary embodiment, the inner wall surface of the return pipe is arranged in a stepped shape, so that the internal space of the return pipe includes a first tube cavity and a second tube cavity; the connection part between the distribution joint and the internal and external machine connecting pipe is sealed in the first tube cavity and forms a diversion path between the cavity wall of the first tube cavity, and the diversion path is arranged to be able to communicate with the internal space of the casing; the second tube cavity is sealed with the internal and external machine connecting pipe to seal the end of the diversion path close to the second tube cavity.

[0010] In an exemplary embodiment, the internal and external machine connecting pipe includes: a pipe body and a thermal insulation component, the pipe body is connected to the pipe joint, the thermal insulation component is sleeved on the pipe body and clamped between the pipe body and the cavity wall of the second tube cavity.

[0011] In an exemplary embodiment, the two return pipes are independent of each other, and the flow guide paths of the two return pipes are respectively connected to the internal space of the casing; or, the two return pipes are connected by a connecting pipe, and the connecting pipe connects the flow guide paths of the two return pipes, and one of the two flow guide paths is connected to the internal space of the casing.

[0012] In an exemplary embodiment, at least one of the return pipes is provided with a protruding connection portion at one end close to the casing, the connection portion is provided with an annular groove, the casing is provided with an avoidance hole, the connection portion is passed through the avoidance hole, and is clamped to the casing through the annular groove.

[0013] In an exemplary embodiment, the connecting portion is plate-shaped and is fixedly connected to the housing via fasteners.

[0014] In an exemplary embodiment, the connection portion is protrudingly provided at a port of one end of the return pipe close to the housing, and an extension pipe is provided at one end of the other return pipe close to the housing, and the extension pipe passes through the housing.

[0015] In an exemplary embodiment, the outer wall surface of the return pipe is arranged in a stepped shape, and the outer wall surface of the return pipe includes a first wall surface and a second wall surface, the cross-sectional area of ​​the second wall surface is smaller than the cross-sectional area of ​​the first wall surface, the anti-condensation component is sleeved on the first wall surface and has an interference fit with the first wall surface, and the anti-condensation component is sleeved on the second wall surface and fixed to the second wall surface.

[0016] In an exemplary embodiment, the casing includes a side panel and a piping pressure plate, the side panel is provided with a mounting notch, the piping pressure plate cover is provided in the mounting notch and is detachably connected to the side panel, and the return component is fixed to the side panel and / or the piping pressure plate.

[0017] In an exemplary embodiment, a bracket is provided in the casing, and the bracket is provided with a supporting surface inclined relative to the piping pressure plate; the refrigerant detection sensor is fixed to the supporting surface and faces the piping pressure plate.

[0018] In an exemplary embodiment, the housing further includes a top plate, and the bracket is fixed to the top plate.

[0019] In an exemplary embodiment, a heat exchange cavity is provided in the casing, the indoor heat exchanger is located in the heat exchange cavity, the refrigerant detection sensor is provided in the heat exchange cavity, and the internal space of the return element is connected to the heat exchange cavity.

[0020] In an exemplary embodiment, the refrigerant input pipe, the refrigerant output pipe and the refrigerant detection sensor are arranged on a side of the indoor heat exchanger close to the return element. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a partial three-dimensional structure of an air duct machine provided in some embodiments of the present application;

[0022] Figure 2 for Figure 1 A three-dimensional structural schematic diagram of the duct machine from another perspective is shown;

[0023] Figure 3 for Figure 1 The schematic diagram of the structure of the duct machine from top view shown;

[0024] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0025] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the middle B part;

[0026] Figure 6 for Figure 1 Schematic diagram of the three-dimensional structure of the middle reflux pipe;

[0027] Figure 7 for Figure 6 A schematic cross-sectional view of the return pipe shown;

[0028] Figure 8 for Figure 1 A partial schematic diagram of the structure of the duct machine as seen from above;

[0029] Fig. 9 for Figure 8 Schematic diagram of the cross-sectional structure in the CC direction;

[0030] Fig.10 A schematic diagram of a specific three-dimensional structure of a duct machine provided in some other embodiments of the present application;

[0031] Fig.11 for Fig.10 Schematic diagram of the three-dimensional structure of the middle reflux component;

[0032] Fig.12 for Fig.11 A schematic cross-sectional structural diagram of the reflux component shown;

[0033] Fig.13 A schematic diagram of a specific three-dimensional structure of a duct machine provided in some embodiments of the present application;

[0034] Fig.14 for Fig.13 Schematic diagram of the three-dimensional structure of the middle reflux component;

[0035] Fig.15 for Fig.14 A schematic cross-sectional structural diagram of the reflux component shown;

[0036] Fig.16 A schematic diagram of a partial exploded structure of a duct machine provided in some embodiments of the present application;

[0037] Fig.17 A partially enlarged structural schematic diagram of an air duct machine provided in some embodiments of the present application;

[0038] Fig.18 A schematic diagram of a partial structure of a duct machine provided in some embodiments of the present application;

[0039] Fig.19This is a schematic diagram of the assembly structure of the top plate and the bracket in some embodiments of the present application;

[0040] Fig. 20 This is a schematic diagram of the assembly of the bracket and the refrigerant detection sensor in some embodiments of the present application;

[0041] Fig.21 A flowchart of a control method provided for some embodiments of the present application.

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] 1 housing, 11 avoidance hole, 12 side plate, 13 pipe pressing plate, 14 bracket, 141 bracket body, 1411 supporting surface, 142 flange, 1421 triangular folding edge, 1422 strip folding edge, 15 heat exchange cavity, 16 top plate, 171 air inlet, 172 air outlet, 18 bottom plate;

[0044] 2 indoor heat exchanger, 21 support plate;

[0045] 31 refrigerant input pipe, 32 refrigerant output pipe, 33 pipe joint, 34 internal and external machine connecting pipe, 341 pipe body, 342 thermal insulation component;

[0046] 4 reflux member, 41 reflux tube, 411 first tube cavity, 412 second tube cavity, 413 flow guide path, 414 connecting portion, 4141 annular groove, 4142 connecting hole, 415 extension tube, 4161 first wall surface, 4162 second wall surface, 42 connecting tube, 43 connecting plate;

[0047] 5. Refrigerant detection sensor;

[0048] 6 anti-condensation parts, 61 cable ties;

[0049] 7Indoor fan. DETAILED DESCRIPTION

[0050] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0051] like Figures 1 to 5 As shown, the embodiment of the present application provides a ducted air conditioner, comprising: a housing 1, an indoor heat exchanger 2, a refrigerant input pipe 31, a refrigerant output pipe 32, a return member 4, an anti-condensation member 6 and a refrigerant detection sensor 5 (such as Figure 8 and Fig. 9 shown).

[0052] Specifically, the indoor heat exchanger 2 is arranged in the casing 1. The indoor heat exchanger 2 may include a heat exchanger body and elbows arranged at both ends of the heat exchanger body. Heat exchange channels may be arranged in the heat exchanger body, and the heat exchange channels may be arranged in a row. The elbows at both ends may be welded to the heat exchanger body to connect the heat exchange channels. One end of the heat exchanger body is provided with an input port for inputting refrigerant into the indoor heat exchanger 2 and an output port for the refrigerant to flow out of the indoor heat exchanger 2.

[0053] The refrigerant input pipe 31 and the refrigerant output pipe 32 are respectively connected to the input port and the output port of the indoor heat exchanger 2. In addition, the refrigerant input pipe 31 and the refrigerant output pipe 32 are both provided with a pipe joint 33 at one end away from the indoor heat exchanger 2. Figure 5 The pipe joint 33 is located outside the casing 1 and is configured to be connected to an internal and external machine connecting pipe 34 located outside the casing 1 .

[0054] like Figure 6 As shown, the return piece 4 is sleeved on the pipe joint 33 and the internal and external machine connecting pipe 34 to seal the connection portion between the pipe joint 33 and the internal and external machine connecting pipe 34 in the return piece 4. In addition, the internal space of the return piece 4 is connected to the internal space of the casing 1 to guide the refrigerant leaking into the return piece 4 into the casing 1.

[0055] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the anti-condensation member 6 is sleeved on the return member 4 and the internal and external machine connecting pipe 34. The anti-condensation member 6 can prevent condensation and avoid condensation water from causing corrosion at the connection part between the pipe joint 33 and the internal and external machine connecting pipe 34. The anti-condensation member 6 can be, but is not limited to, an insulation pipe.

[0056] The refrigerant detection sensor 5 is disposed in the housing 1 and is used to detect leaked refrigerant.

[0057] Among them, the casing 1 is the casing 1 of the indoor unit. The duct unit may also include an outdoor unit (not shown in the figure). The indoor unit and the outdoor unit are connected by two indoor and outdoor unit connecting pipes 34 to ensure that the refrigerant can circulate between the indoor unit and the outdoor unit to form a refrigerant cycle.

[0058] The refrigerant input pipe 31 may include a main pipe and a plurality of branch pipes connected to the main pipe. The refrigerant output pipe 32 may also include a main pipe and a plurality of branch pipes connected to the main pipe. The main pipe may include a pipe section bent to form a U shape. One end of the main pipe is connected to a pipe joint 33, and the other end of the main pipe is connected to a plurality of branch pipes, and the plurality of branch pipes are connected to the indoor heat exchanger 2. The refrigerant input pipe 31 may be formed by welding a plurality of pipes. The refrigerant output pipe 32 may be formed by welding a plurality of pipes.

[0059] After research and analysis, it was found that there are two main areas where refrigerant leakage is prone to occur in ducted air conditioners: the first area is located inside the casing 1 of the indoor unit, which is the welding position of the indoor heat exchanger 2 and the refrigerant inlet pipe 31 and the refrigerant outlet pipe 32 (including the welding positions at both ends of the indoor heat exchanger 2, the welding positions of the indoor heat exchanger 2 and the refrigerant inlet pipe 31 and the refrigerant outlet pipe 32, the U-shaped pipe section of the refrigerant inlet pipe 31 and the refrigerant outlet pipe 32, etc.), that is, Fig.18 The second part is located outside the indoor unit casing 1, which is the connection part between the pipe joint 33 and the indoor and outdoor unit connecting pipe 34, that is, Fig.18 The area indicated by the box on the right.

[0060] Therefore, the duct air conditioner provided in the embodiment of the present application is provided with a refrigerant detection sensor 5 in the casing 1 to detect leaked refrigerant. Since the leaked refrigerant is usually in a gaseous state, the refrigerant leaked in the casing 1 can be detected by the refrigerant detection sensor 5 located in the casing 1. The refrigerant leaked outside the casing 1 can enter the casing 1 through the return member 4, so the refrigerant leaked outside the casing 1 can also be detected by the refrigerant detection sensor 5. In this way, the duct air conditioner only needs to be provided with one refrigerant detection sensor 5 to detect refrigerant leakage of the entire machine, effectively reducing the risk of flammability and explosion caused by refrigerant leakage of the duct air conditioner, and a smaller number of refrigerant detection sensors 5 can be used to detect refrigerant leakage of the entire machine, which is conducive to simplifying the structure of the duct air conditioner and reducing production costs.

[0061] In addition, the return member 4 is sleeved on the pipe joint 33 and the internal and external machine connecting pipe 34 to form an air flow space (i.e., the following guide path 413) for guiding the refrigerant leaking from the outside of the casing 1 to the inside of the casing 1. Compared with the scheme of digging out part of the material in the anti-condensation member 6 to form the guide path 413 or digging out part of the material in the anti-condensation member 6 and inserting a pipe component in the anti-condensation member 6 to form the guide path 413, in this scheme, the anti-condensation member 6 is located outside the return member 4, and the return member 4 needs to be sleeved on the pipe joint 33 and the internal and external machine connecting pipe 34 first, and then the anti-condensation member 6 is sleeved, so that the installation and use of the return member 4 does not depend on the anti-condensation member 6, and it is convenient to reasonably set the shape and size of the return member 4 according to needs, which is conducive to the smooth return of the leaked refrigerant to the casing 1, thereby improving the detection sensitivity of the refrigerant detection sensor 5 to the leaked refrigerant; and the return member 4 will not interfere with the anti-condensation member 6, and the sealing is better, and the anti-condensation effect is better.

[0062] In some exemplary embodiments, the return member 4 includes two return pipes 41, such as Figure 1 , Figure 2 , Figure 4 and Figure 5As shown. The two return pipes 41 are respectively sleeved on two corresponding pipe joints 33 and internal and external machine connecting pipes 34. In this way, the structure of the return member 4 is relatively simple, which is convenient for processing and molding, and also convenient for assembly between the return member 4 and the pipe joints 33, the internal and external machine connecting pipes 34 and other components.

[0063] The anti-condensation member 6 is fixedly matched with the return pipe 41 , which is beneficial to improving the position stability of the anti-condensation member 6 and the return member 4 , and further beneficial to improving the use reliability of the anti-condensation member 6 and the return member 4 .

[0064] The anti-condensation component 6 can be fixed on the return component 4 by means of a cable tie 61 , a clamp or the like.

[0065] In some exemplary embodiments, please refer to Figures 5 to 7 As shown, the inner wall surface of the return pipe 41 is arranged in a stepped shape, so that the internal space of the return pipe 41 includes a first tube cavity 411 and a second tube cavity 412. The connection part of the pipe joint 33 and the internal and external machine connecting pipe 34 is sealed in the first tube cavity 411 and forms a guide passage 413 with the cavity wall of the first tube cavity 411. The guide passage 413 is arranged to be able to communicate with the internal space of the casing 1, so that the refrigerant leaked from the casing 1 can flow back into the casing 1 through the guide passage 413. The second tube cavity 412 is sealed and matched with the internal and external machine connecting pipe 34 to seal the end of the guide passage 413 close to the second tube cavity 412, so as to prevent the refrigerant leaked from the casing 1 from leaking through the second tube cavity 412.

[0066] Please refer to Figures 5 to 7 As shown, the cross-sectional area of ​​the first tube cavity 411 can be greater than the cross-sectional area of ​​the second tube cavity 412. In other words, the first tube cavity 411 is relatively thick, and the second tube cavity 412 is relatively thin. This is conducive to increasing the flow area of ​​the guide passage 413, and further facilitates the refrigerant leaked from the housing 1 to flow smoothly back into the housing 1. The guide passage 413 can be an annular channel.

[0067] The provision of the second tube cavity 412 can increase the contact area between the return component 4 and the internal and external machine connecting pipe 34, which is beneficial to improving the sealing effect of the end of the convection guide path 413 close to the second tube cavity 412, and is also beneficial to improving the position stability of the return component 4.

[0068] Of course, the internal space of the reflux tube 41 may also include only the first lumen 411 without including the second lumen 412 .

[0069] In some exemplary embodiments, the internal and external machine connecting pipe 34 includes: a pipe body 341 and a heat preservation member 342, such as Figure 5 The pipe body 341 is connected to the pipe joint 33. The heat-insulating member 342 is sleeved on the pipe body 341 and sandwiched between the pipe body 341 and the wall of the second pipe cavity 412.

[0070] The heat preservation member 342 can have a heat preservation effect on the tube body 341, and can also have an anti-condensation effect, which is equivalent to providing a double-layer anti-condensation member 6, which is conducive to further improving the anti-condensation effect. In addition, the heat preservation member 342 can also serve as a sealant, and can seal the space between the tube body 341 and the wall of the second tube cavity 412, so there is no need to provide an additional sealant.

[0071] Furthermore, the heat-insulating member 342 is located inside the reflux member 4 and mainly located inside the second tube cavity 412 , and thus will not have an adverse effect on the reflux function of the reflux member 4 .

[0072] In some exemplary embodiments, the end of the heat preservation member 342 close to the housing 1 extends into the first lumen 411, such as Figure 5 As shown, the heat preservation member 342 is spaced apart from the wall of the first tube cavity 411, and the end away from the housing 1 extends to the outside of the return pipe 41, as shown in FIG. Figure 5 shown.

[0073] This helps to increase the contact area between the heat preservation component 342 and the internal and external unit connecting pipe 34, thereby improving the heat preservation effect and the anti-condensation effect.

[0074] In some exemplary embodiments, one end of the anti-condensation member 6 away from the housing 1 protrudes from the second wall surface 4162, such as Figure 5 As the anti-condensation member 6 can be deformed to a certain extent, the end of the anti-condensation member 6 away from the housing 1 can be pressed onto the end of the return pipe 41 away from the housing 1, thereby sealing the end of the second tube cavity 412 away from the first tube cavity 411, further improving the sealing performance of the return pipe 41.

[0075] In some exemplary embodiments, the two return pipes 41 are independent of each other, and the flow paths 413 of the two return pipes 41 are respectively connected to the internal space of the housing 1, such as Figure 1 , Figure 2 , Figure 4 and Figure 5 shown.

[0076] In this way, the two return pipes 41 can be installed separately. In addition, if refrigerant leaks at the connection position between any pipe joint 33 and the corresponding internal and external machine connecting pipe 34, the leaked refrigerant can flow back into the casing 1 through the corresponding guide path 413. The return path is relatively short, which is conducive to improving the detection sensitivity of refrigerant leakage.

[0077] In other exemplary embodiments, the two return pipes 41 are connected by a connecting pipe 42, such as Fig.11 , Fig.12 , Fig.14 and Fig.15The connecting pipe 42 is connected to the flow guiding passages 413 of the two return pipes 41 , and one of the two flow guiding passages 413 is connected to the inner space of the housing 1 .

[0078] In this way, it is only necessary to connect the flow guiding passage 413 of one return pipe 41 to the inside of the casing 1 , so that the two flow guiding passages 413 can be connected to the inner space of the casing 1 .

[0079] The two reflux pipes 41 and the connecting pipe 42 may be an integrated structure, which can simplify the assembly process and is also conducive to improving the sealing performance of the reflux component 4 .

[0080] In some exemplary embodiments, the return member 4 is a rubber member, so that the return member 4 itself has good sealing and corrosion resistance, and other additional sealing members can be omitted. Of course, the material of the return member 4 is not limited to rubber, and can also be silicone or other materials.

[0081] In some exemplary embodiments, at least one end of the return pipe 41 close to the housing 1 is provided with a connecting portion 414. Figure 6 , Figure 7 , Fig.11 , Fig.12 , Fig.14 and Fig.15 The connecting portion 414 is provided with an annular groove 4141. The housing 1 is provided with an avoidance hole 11, and the connecting portion 414 is penetrated through the avoidance hole 11 and is clamped to the housing 1 through the annular groove 4141. Figure 1 , Figure 2 , Fig.10 and Fig.13 The avoidance hole 11 can be enclosed by the side plate 12 of the housing 1 and the pipe pressure plate 13, as shown in FIG. Fig.16 The pipe pressing plate 13 is detachable, which is convenient for the installation and removal of the reflux component 4.

[0082] In this way, the connection portion 414 of the return pipe 41 is directly clamped on the housing 1, and the hole wall of the avoidance hole 11 of the housing 1 is inserted into the annular groove 4141, so that the return pipe 41 and the housing 1 can be clamped and fixed. In this way, the connection portion 414 not only connects the return pipe 41 and the housing 1, but also has a sealing effect, and also has a function of connecting the guide passage 413 with the internal space of the housing 1.

[0083] When the two return pipes 41 are independent of each other, the two return pipes 41 are provided with connecting parts 414, which are respectively clamped on the housing 1. Figure 1 , Figure 2 and Figure 5 shown.

[0084] When the two return pipes 41 are connected by the connecting pipe 42, the connecting portion 414 may be provided on only one return pipe 41 (the return pipe 41 whose flow guide passage 413 is connected to the inside of the housing 1) so that the connecting portion 414 is snap-fitted to the housing 1 and connected to the inner space of the housing 1. Fig.10 , Fig.11 , Fig.12 As shown. The other return pipe 41 does not need to be provided with a connection portion 414, but is inserted into the housing 1 through an extension pipe 415. That is, a connection portion 414 is protruding from the end of one return pipe 41 close to the housing 1, and an extension pipe 415 is provided at the end of the other return pipe 41 close to the housing 1, and the extension pipe 415 is inserted into the housing 1. The outer diameter of the extension pipe 415 can be appropriately reduced to form a stepped structure, such as Fig.11 and Fig.12 As shown, the return pipe 41 can be against the outer wall of the housing 1. The inner diameter of the extension pipe 415 is also reduced, as shown in FIG. Fig.12 As shown, the return pipe 41 can be adapted to the pipe diameter of the corresponding internal and external machine connecting pipe 34, so the return pipe 41 may not have a guide passage 413.

[0085] In some embodiments, the connecting portion 414 is configured as an annular flange, such as Figure 6 and Figure 7 shown.

[0086] In other embodiments, the connecting portion 414 is plate-shaped, such as Fig.14 and Fig.15 As shown, the connecting portion 414 is configured as a connecting plate 43, and the connecting plate 43 is fixedly connected to the housing 1 via fasteners.

[0087] This is conducive to increasing the contact area between the return pipe 41 and the housing 1, and the fastener is conducive to further improving the connection strength between the return pipe 4 and the housing 1, thereby helping to improve the position stability and reliability of the return pipe 41. The connecting plate 43 can be fixed to the housing 1 by means of screws or the like. The refrigerant input pipe 31 and the refrigerant output pipe 32 can be inserted into the return pipe 41 through the avoidance hole 11 of the housing 1 and the port of the return pipe 41. The connecting plate 43 can be, but is not limited to, square, and the connecting plate 43 can be provided with connecting holes 4142, such as Fig.13 and Fig.14 As shown, the connecting hole 4142 is for the screw to pass through.

[0088] In other exemplary embodiments, at least one return pipe 41 is provided with a connecting plate 43 at a port near one end of the housing 1, and the connecting plate 43 is fitted and fixed to the housing 1. Compared with the above-mentioned embodiment, the connecting plate 43 is equivalent to a single-layer structure, which is not clamped to the housing 1, but is directly fixed to the housing 1 by fasteners, which can be referred to Fig.13 shown.

[0089] In some exemplary embodiments, the outer wall surface of the return pipe 41 is configured to be stepped, such as Figure 6 , Figure 7 , Fig.11 , Fig.12 , Fig.14 and Fig.15 The outer wall of the return pipe 41 includes a first wall 4161 and a second wall 4162. The cross-sectional area of ​​the second wall 4162 is smaller than the cross-sectional area of ​​the first wall 4161. The anti-condensation member 6 is sleeved on the first wall 4161 and has an interference fit with the first wall 4161. Figure 5 As shown, the anti-condensation component 6 is sleeved on the second wall 4162 and fixed to the second wall 4162 .

[0090] The first wall surface 4161 may be located outside the first tube cavity 411, and the second wall surface 4162 may be located outside the second tube cavity 412. In this way, the return pipe 41 is a stepped pipe as a whole.

[0091] like Figure 5 As shown, the condensation prevention member 6 can be fixed to the second wall surface 4162 by means of a tie 61 or a clamp. Of course, the outer wall surface of the return pipe 41 can also be set to a constant diameter structure.

[0092] In some exemplary embodiments, the housing 1 includes a side plate 12 and a pipe clamp 13. Figure 1 , Figure 2 and Fig.16 As shown, the side plate 12 is provided with a mounting notch, and the pipe pressure plate 13 is covered in the mounting notch and is detachably connected to the side plate 12. The reflux member 4 is fixed to the side plate 12 and / or the pipe pressure plate 13, as shown in FIG. Figure 1 , Figure 2 Thus, when installing the return member 4, the pipe clamping plate 13 can be removed. Fig.16 As shown, after the reflux component 4 is installed in place, the pipe pressing plate 13 is installed, which is helpful to reduce the difficulty of assembly.

[0093] In some exemplary embodiments, a bracket 14 is provided in the housing 1, such as Fig. 9 , Fig.16 and Fig.17 The bracket 14 is provided with a support surface 1411 which is inclined relative to the pipe pressing plate 13. Fig. 20 The refrigerant detection sensor 5 is fixed to the support surface 1411 and faces the pipe pressure plate 13, as shown in FIG. Fig. 9 and Fig.16 The refrigerant detection sensor 5 can be fixed on the bracket 14 by means of screws, buckles, etc.

[0094] In this way, the refrigerant detection sensor 5 can be seen by removing the pipe pressing plate 13, thereby facilitating the inspection and maintenance of the refrigerant detection sensor 5.

[0095] In some exemplary embodiments, the housing 1 further includes a top plate 16, such as Fig.19 As shown, the bracket 14 is fixed to the top plate 16. The top plate 16 here is based on the direction of the duct machine after it is installed in the application scene after leaving the factory. After installation, the top plate 16 is on the top and the bottom plate 18 is on the bottom. However, during the assembly process before leaving the factory, the top plate 16 can be at the bottom and the bottom plate 18 can be at the top to facilitate the assembly of the duct machine itself. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Fig. 9 The direction is based on the state where the indoor unit of the duct unit is hung on the ceiling.

[0096] The bracket 14 can be fixed to the top plate 16 by means of screws, buckles, etc. For example, the bracket 14 may include a bracket body 141 and two flanges 142. The bracket body 141 is provided with a support surface 1411, and the flanges 142 may include a triangular folded edge 1421 and a strip folded edge 1422. The triangular folded edge is bent and connected to the bracket body 141, so that the support surface 1411 has a certain slope. The strip folded edge 1422 is bent and connected to the triangular folded edge 1421, and the strip folded edge 1422 is in contact with the top plate 16 and can be fixed to the top plate 16 by means of screws, etc.

[0097] Alternatively, the bracket 14 and the top plate 16 may also be provided as an integrated structure. In this way, the refrigerant detection sensor 5 is not likely to interfere with the evaporator, the refrigerant input pipe 31, the refrigerant output pipe 32 and other components.

[0098] In some exemplary embodiments, the indoor heat exchanger 2 is tilted in the heat exchange chamber 15, such as Fig.18 As shown. An indoor fan 7 may also be provided in the housing 1. Two side panels 12 of the housing 1 arranged opposite to each other are respectively provided with an air inlet 171 and an air outlet 172. The air inlet 171 may be provided on the rear side panel, the air outlet 172 may be provided on the front side panel, and the indoor heat exchanger 2 is located in front of the indoor fan 7.

[0099] A water receiving tray may also be provided below the indoor heat exchanger 2. The indoor heat exchanger 2 may be provided with two left and right support plates 21 (such as Fig.18 The water receiving tray, the support plate 21, the top plate 16, the evaporator, and the side plate 12 of the casing 1 with the pipe pressing plate 13 can form a closed cavity, such as Fig.18 As shown, the refrigerant detection sensor 5 is arranged on the top plate 16, and can detect the refrigerant leakage in the casing 1 in time.

[0100] The refrigerant detection sensor 5 can be specifically located above the U-shaped pipe section of the refrigerant input pipe 31 and the refrigerant output pipe 32. After testing, it is found that the refrigerant detection sensor 5 is arranged at this position, which has a higher detection accuracy for the refrigerant leakage detection of the whole machine.

[0101] In some exemplary embodiments, a heat exchange chamber 15 is provided in the housing 1. Figure 8 and Fig. 9 As shown, the indoor heat exchanger 2 is located in the heat exchange chamber 15 , the refrigerant detection sensor 5 is disposed in the heat exchange chamber 15 , and the internal space of the return member 4 is connected to the heat exchange chamber 15 .

[0102] In this way, the refrigerant detection sensor 5 and the refrigerant leakage location in the casing 1 are located in the same cavity, which is beneficial to reducing the distance between the refrigerant detection sensor 5 and the refrigerant leakage location, thereby facilitating improving the detection sensitivity of the refrigerant detection sensor 5 .

[0103] In some exemplary embodiments, the refrigerant input pipe 31, the refrigerant output pipe 32 and the refrigerant detection sensor 5 are arranged on a side of the indoor heat exchanger 2 close to the return member 4, such as Figure 8 shown.

[0104] In this way, the refrigerant leaked on both sides of the indoor heat exchanger 2, the refrigerant inlet pipe 31, the refrigerant outlet pipe 32 and the refrigerant leaked outside the casing 1 can all flow to the refrigerant detection sensor 5 and be detected by the refrigerant detection sensor 5, and the flow paths of the refrigerant leaked on the side of the indoor heat exchanger 2 close to the return component 4, the refrigerant inlet pipe 31, the refrigerant outlet pipe 32 and the refrigerant leaked outside the casing 1 and the refrigerant leaked outside the casing 1 are relatively short, which is beneficial to improving the detection sensitivity of the refrigerant detection sensor 5.

[0105] The present application also provides a control method for a duct machine according to any one of the above embodiments. The control method includes:

[0106] In the standby state, it is determined that a refrigerant leak occurs according to the detection result of the refrigerant detection sensor 5;

[0107] An alarm signal is issued and the indoor fan 7 is started to blow away the leaked refrigerant.

[0108] When it is determined that no refrigerant leakage has occurred based on the detection result of the refrigerant detection sensor 5, normal standby is maintained.

[0109] The alarm signal may include but is not limited to: an acoustic signal, an optical signal, etc. The acoustic signal may be but is not limited to a beep, and the optical signal may be but is not limited to a flashing light signal.

[0110] In this way, when a refrigerant leak occurs in a ducted air conditioner, it can be detected in time and an alarm can be issued. At the same time, response measures can be taken to disperse the refrigerant to avoid dangerous refrigerant accumulation.

[0111] In one embodiment, Fig.21 As shown, when the duct air conditioner is powered on, the duct air conditioner enters the standby state, and the refrigerant detection sensor 5 can perform the refrigerant detection function. If the refrigerant detection sensor 5 does not detect a refrigerant leak, the duct air conditioner is in normal standby. If the refrigerant detection sensor 5 detects a refrigerant leak, the signal is transmitted to the control board of the duct air conditioner, and the control board of the duct air conditioner outputs a refrigerant leak instruction, the buzzer sounds an alarm, and the indoor fan 7 runs to blow the refrigerant away.

[0112] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0113] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0114] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0115] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0116] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0117] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A duct machine, characterized in that: include: chassis; An indoor heat exchanger is disposed in the casing; The refrigerant input pipe and the refrigerant output pipe are respectively connected to the input port and the output port of the indoor heat exchanger, and are provided with a pipe joint at one end away from the indoor heat exchanger; the pipe joint is located outside the casing and is configured to be connected to the internal and external machine connecting pipes located outside the casing; a return piece, which is sleeved on the pipe joint and the internal and external machine connecting pipe, so that the connection part between the pipe joint and the internal and external machine connecting pipe is sealed in the return piece, and the internal space of the return piece is communicated with the internal space of the casing, so as to guide the refrigerant leaking into the return piece into the casing; An anti-condensation component is sleeved on the return component and the internal and external machine connecting pipe; and The refrigerant detection sensor is arranged in the casing.

2. The air duct machine according to claim 1, characterized in that: The reflux component includes two reflux pipes, and the two reflux pipes are respectively sleeved on two corresponding pipe joints and internal and external machine connecting pipes; The anti-condensation component is fixedly matched with the return pipe.

3. The air duct machine according to claim 2, characterized in that: The inner wall surface of the return pipe is arranged in a stepped shape, so that the internal space of the return pipe includes a first tube cavity and a second tube cavity; the connection part between the pipe joint and the internal and external machine connecting pipe is sealed in the first tube cavity and a flow guide passage is formed between the cavity wall of the first tube cavity, and the flow guide passage is arranged to be able to communicate with the internal space of the housing; The second tube cavity is sealed and matched with the internal and external machine connecting pipe to seal the end of the flow guide passage close to the second tube cavity.

4. The air duct machine according to claim 3, characterized in that: The internal and external machine connecting pipe comprises: a pipe body and a heat preservation member, the pipe body is connected to the pipe joint, the heat preservation member is sleeved on the pipe body and clamped between the pipe body and the cavity wall of the second tube cavity.

5. The air duct machine according to claim 3, characterized in that: The two return pipes are independent of each other, and the flow paths of the two return pipes are respectively connected to the internal space of the casing; or The two return pipes are connected by a connecting pipe, and the connecting pipe connects the flow guide passages of the two return pipes, and one of the two flow guide passages is connected to the inner space of the casing.

6. The duct machine according to any one of claims 2 to 5, characterized in that: At least one of the return pipes has a connection portion protruding from a port at one end close to the casing, the connection portion has an annular groove, the casing has an avoidance hole, the connection portion passes through the avoidance hole, and is clamped to the casing through the annular groove.

7. The air duct machine according to claim 6, characterized in that: The connecting portion is plate-shaped and is fixedly connected to the housing via fasteners.

8. The air duct machine according to claim 6, characterized in that: The connecting portion is protrudingly provided at a port of one end of the return pipe close to the housing, and an extension pipe is provided at one end of the other return pipe close to the housing, and the extension pipe is passed through the housing.

9. The duct machine according to any one of claims 2 to 5, characterized in that: The outer wall surface of the return pipe is arranged in a stepped shape, and the outer wall surface of the return pipe includes a first wall surface and a second wall surface, the cross-sectional area of ​​the second wall surface is smaller than the cross-sectional area of ​​the first wall surface, the anti-condensation component is sleeved on the first wall surface and has an interference fit with the first wall surface, and the anti-condensation component is sleeved on the second wall surface and fixed to the second wall surface.

10. The duct machine according to any one of claims 1 to 5, characterized in that: The housing comprises a side plate and a piping pressure plate, the side plate is provided with a mounting notch, the piping pressure plate cover is arranged in the mounting notch and is detachably connected to the side plate, and the reflux component is fixed to the side plate and / or the piping pressure plate.

11. The air duct machine according to claim 10, characterized in that: A bracket is provided in the casing, and the bracket is provided with a supporting surface which is inclined relative to the piping pressure plate; the refrigerant detection sensor is fixed on the supporting surface and faces the piping pressure plate.

12. The air duct machine according to claim 11, characterized in that: The housing further comprises a top plate, and the bracket is fixed to the top plate.

13. The duct machine according to any one of claims 1 to 5, characterized in that: A heat exchange cavity is provided in the casing, the indoor heat exchanger is located in the heat exchange cavity, the refrigerant detection sensor is provided in the heat exchange cavity, and the internal space of the reflux component is connected to the heat exchange cavity.

14. The air duct machine according to claim 13, characterized in that: The refrigerant input pipe, the refrigerant output pipe and the refrigerant detection sensor are arranged on a side of the indoor heat exchanger close to the return element.

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