Duct machine

Abstract

The utility model discloses a duct machine, which comprises: a machine body, and the two ends of the machine body in the width direction are respectively provided with an air-conditioning air inlet and an air-conditioning air outlet; an indoor heat exchanger and a cross-flow fan are arranged in the machine body; the indoor heat exchanger is a three-fold heat exchanger, and the indoor heat exchanger comprises a plurality of heat exchange tubes, and the plurality of heat exchange tubes are connected to form a plurality of refrigerant flow paths; two end plates are respectively connected to the two ends of the indoor heat exchanger in the length direction, and the distance between the two end plates is not less than 1000mm; in the cooling mode, the refrigerant flow path has an inlet and two outlets, so that the refrigerant enters the corresponding refrigerant flow path through the inlet, and flows out of the refrigerant flow path through the two outlets. The duct machine provided by the utility model performs a flow diversion process on each refrigerant flow path in the cooling mode, greatly reduces the pressure drop during cooling, conforms to the refrigerant flow state during heating, and can increase the refrigerant flow rate under the same compressor frequency, thereby improving the heating capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to a duct air conditioner. Background Art

[0002] With the popularity of air conditioners, more and more users choose to install central air conditioners at home. As a type of central air conditioner, duct air conditioners are favored by users for their low cost, simple structure, hidden installation and other advantages. Existing duct air conditioners can usually be installed in a suspended ceiling (it can be a suspended ceiling in front of a curtain), which mainly includes a machine body and a cross-flow fan and an indoor heat exchanger installed inside the machine body. An air conditioning air inlet and an air conditioning air outlet are provided on the machine body. The cross-flow fan introduces air from the air conditioning air inlet into the machine body, and after heat exchange in the indoor heat exchanger, air conditioning air is formed and sent out from the air conditioning air outlet.

[0003] Due to the limited ceiling space, the depth and height of the ducted air conditioner are compressed, which makes the length of the machine body longer. In order to meet the performance requirements of the ducted air conditioner, the indoor heat exchanger adopts a non-straight plate structure to match the body structure of the ducted air conditioner. Among them, the indoor heat exchanger includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are connected to form a plurality of refrigerant flow paths.

[0004] In the related art, the indoor heat exchanger extends along the length of the machine body and is installed in the machine body through two end plates. The length of the machine body is too long, so the distance between the two end plates is long. Therefore, the flow path of each refrigerant flow path in the indoor heat exchanger is long, which makes it impossible for the ducted machine to exert its maximum capacity in the cooling and heating state, and its market competitiveness is poor. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end,

[0006] The utility model provides a duct machine, comprising:

[0007] The machine body has air-conditioning inlets and air-conditioning outlets at both ends in the width direction;

[0008] An indoor heat exchanger is disposed in the machine body and close to the air inlet of the air conditioner;

[0009] A cross-flow fan is disposed in the machine body and between the indoor heat exchanger and the air outlet of the air conditioner. Under the action of the cross-flow fan, indoor air enters the machine body through the air inlet of the air conditioner, and is output to the room through the air outlet of the air conditioner after heat exchange through the indoor heat exchanger;

[0010] The indoor heat exchanger is a three-fold heat exchanger, and the indoor heat exchanger includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are connected to form a plurality of refrigerant flow paths;

[0011] Two end plates are respectively connected to the two ends of the indoor heat exchanger in the length direction, and the distance between the two end plates is not less than 1000 mm;

[0012] In the cooling mode, the refrigerant flow path has an inlet and two outlets, so that the refrigerant enters the corresponding refrigerant flow path through the inlet and flows out of the refrigerant flow path through the two outlets.

[0013] The ducted air conditioner provided by this technical solution has a long end plate spacing, so each refrigerant flow path has a long flow path. In the cooling mode, each refrigerant flow path is set to have one inlet and two outlets, that is, each refrigerant flow path is diverted, so that the pressure drop can be greatly reduced during cooling, and the refrigerant flow state is met during heating. The refrigerant flow rate can be increased at the same compressor frequency, and the heating capacity can be improved, so that the ducted air conditioner can exert its maximum capacity in the cooling and heating states.

[0014] The utility model also provides a duct machine, which includes:

[0015] The machine body has an air-conditioning air inlet and an air-conditioning air outlet at both ends in the width direction, and the machine body includes a top plate and a bottom plate arranged opposite to each other in the vertical direction;

[0016] An indoor heat exchanger is disposed in the machine body and close to the air inlet of the air conditioner;

[0017] A cross-flow fan is disposed in the machine body and between the indoor heat exchanger and the air outlet of the air conditioner. Under the action of the cross-flow fan, indoor air enters the machine body through the air inlet of the air conditioner, and is output to the room through the air outlet of the air conditioner after heat exchange through the indoor heat exchanger;

[0018] The indoor heat exchanger is a three-fold heat exchanger, and the indoor heat exchanger includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are connected to form a plurality of refrigerant flow paths, and a refrigerant flow path relatively close to the bottom plate among the plurality of refrigerant flow paths is defined as a first refrigerant flow path, and the first refrigerant flow path is located at the bottom of the indoor heat exchanger;

[0019] In the cooling mode, the first refrigerant flow path has an inlet and an outlet, and at least part of the other refrigerant flow paths has an inlet and two outlets.

[0020] The duct machine provided by the technical solution, in the cooling mode, except for the first refrigerant flow path, at least part of the other refrigerant flow paths are set as one inlet and two outlets, that is, at least one of the other refrigerant flow paths is shunted, so that the pressure drop can be greatly reduced during cooling, and the refrigerant flow state is met during heating. The refrigerant flow rate can be increased at the same compressor frequency, and the heating capacity is improved, so that the duct machine can exert its maximum capacity under the cooling and heating states. In addition, in the cooling mode, condensed water accumulates at the bottom of the indoor heat exchanger, so that the heat exchange capacity of the first refrigerant flow path is poor compared with other refrigerant flow paths. The first refrigerant flow path is not shunted to ensure the heat exchange capacity of the first refrigerant flow path, avoid the waste of capacity caused by its shunting treatment, and avoid making its heat exchange capacity worse; in addition, the non-shunting of the first refrigerant flow path can reduce its refrigerant flow rate and reduce the pressure drop to a certain extent.

[0021] In some embodiments, the indoor heat exchanger includes a first section heat exchanger, a second section heat exchanger and a third section heat exchanger, and the first section heat exchanger, the second section heat exchanger and the third section heat exchanger are sequentially connected from bottom to top to form a half-enclosed structure, and the half-enclosed structure has an opening toward the cross-flow fan to surround part of the cross-flow fan, thereby improving the heat exchange efficiency of the indoor heat exchanger.

[0022] In some embodiments, the first section heat exchanger and the second section heat exchanger are completely cut apart at the joint portion thereof, and the first section heat exchanger and the second section heat exchanger are plugged together and arranged at a first preset angle; in this arrangement, the first section heat exchanger and the second section heat exchanger are completely cut apart, so that the angle of the first section heat exchanger is not restricted by the structure, and at the same time, the fin areas of the two sections of the heat exchanger are in contact with each other sufficiently, thereby making it easier for the condensed water to flow to the bottom from the first preset angle.

[0023] In some embodiments, the first refrigerant flow path close to the base plate and the inlet and outlet of the first refrigerant flow path are arranged on the first section heat exchanger, and an acute angle is formed between the first section heat exchanger and the horizontal plane where the free end is located, with the opening facing the air inlet of the air conditioner, so as to facilitate the gathering of condensed water in the first refrigerant flow path.

[0024] In some embodiments, the first section heat exchanger and the second section heat exchanger are an integrated structure, and a bending angle is formed at the connection between the first section heat exchanger and the second section heat exchanger by special-shaped cutting, thereby improving the production efficiency of the indoor heat exchanger.

[0025] In some embodiments, double rows of heat exchange tubes are provided in the first heat exchanger, the second heat exchanger and the third heat exchanger, so that the passing air can be heat exchanged more quickly and thoroughly, thereby further improving the heat exchange quality.

[0026] In some of the embodiments, the heat exchange tube is an internally threaded tube, and the inner diameter of the internally threaded tube does not exceed 5 mm, so that the indoor heat exchanger can obtain a greater heat exchange capacity within the same heat exchanger area as much as possible.

[0027] In some of the embodiments, the refrigerant flow path having one inlet and two outlets is defined as the second refrigerant flow path, the heat exchange tube is a U-shaped tube, and the second refrigerant flow path includes a plurality of heat exchange tubes; in the cooling mode, the refrigerant entering the second refrigerant flow path from the inlet passes through at least one of the heat exchange tubes and is split by the claw-type three-way tube to form two refrigerant paths, which flow out of the second refrigerant flow path from the two outlets respectively.

[0028] In some of the embodiments, the refrigerant flow paths are configured to be at least six; and / or each of the refrigerant flow paths includes the same number of the heat exchange tubes, each of the heat exchange tubes has the same length, and the refrigerant flow paths are evenly divided to improve the uniformity of the refrigerant flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an embodiment of the utility model air duct machine;

[0030] Figure 2 This is a schematic structural diagram of an embodiment of the utility model duct machine from another perspective;

[0031] Figure 3 It is a front view of an embodiment of the utility model air duct machine;

[0032] Figure 4 yes Figure 3 Sectional view in the AA direction;

[0033] Figure 5 It is a structural schematic diagram of a heat exchanger assembly in one embodiment of the utility model air duct machine;

[0034] Figure 6 It is an exploded view of a fan assembly in one embodiment of the utility model duct fan;

[0035] Figure 7 It is a structural schematic diagram of an embodiment of the utility model duct machine from another perspective;

[0036] Figure 8 This is a schematic diagram of the structure of an embodiment of the utility model air duct machine in which the air inlet filter assembly is omitted;

[0037] Fig. 9 yes Figure 7 A partial enlarged view of the middle A;

[0038] Fig.10 yes Figure 8 A partial enlarged view of point C in the middle;

[0039] Fig.11 It is a structural schematic diagram of a heat exchanger assembly in another perspective in one embodiment of the utility model air duct machine;

[0040] Fig.12 It is a partial structural schematic diagram of the end plate and the temperature detection assembly in one embodiment of the utility model air duct machine;

[0041] Fig.13 This is a schematic diagram of the installation of a temperature detection component in another embodiment of the utility model air duct machine;

[0042] Fig.14 It is a three-dimensional diagram of an embodiment of the utility model air duct machine;

[0043] Fig.15 yes Fig.14 A partial enlarged view of point B in the middle;

[0044] Fig.16 It is a cross-sectional view of a heat exchanger assembly in one embodiment of the utility model air duct machine;

[0045] Fig.17 It is a partial structural schematic diagram of another embodiment of the duct machine of the utility model in which the first side plate is omitted;

[0046] Fig.18 It is a schematic diagram of the installation of the temperature detection component in another embodiment of the duct machine of the utility model;

[0047] Fig.19 This is a schematic diagram of the structure of an indoor heat exchanger in one embodiment of the utility model air duct machine Figure 1 ;

[0048] Fig. 20 This is a schematic diagram of the structure of an indoor heat exchanger in one embodiment of the utility model air duct machine Figure 2 ;

[0049] Fig.21 It is a schematic diagram of the connection between the indoor heat exchanger and the inlet and outlet pipe components in one embodiment of the utility model air duct machine;

[0050] Fig. 22 This is a schematic diagram of the equal distribution of the refrigerant flow path inside the indoor heat exchanger in one embodiment of the utility model duct machine Figure 1 ;

[0051] Fig.23 It is a structural schematic diagram of a heat exchange tube in an embodiment of the utility model air duct machine;

[0052] Fig.24 It is a partial structural schematic diagram of a heat exchanger assembly in one embodiment of the utility model air duct machine;

[0053] Fig.25 This is a schematic diagram of the connection between the first section heat exchanger and the second section heat exchanger in one embodiment of the utility model duct machine Figure 1 ;

[0054] Fig.26 This is a schematic diagram of the connection between the first section heat exchanger and the second section heat exchanger in one embodiment of the utility model duct machine Figure 2 ;

[0055] Fig. 27 This is a schematic diagram of the equal distribution of the refrigerant flow path inside the indoor heat exchanger in one embodiment of the utility model duct machine Figure 2 ;

[0056] Fig.28 It is a schematic diagram of the uneven distribution of the refrigerant flow path inside the indoor heat exchanger in one embodiment of the utility model duct machine;

[0057] Fig.29 This is a schematic diagram of the use of split flow treatment in the refrigerant flow path of the indoor heat exchanger in one embodiment of the utility model duct machine Figure 1 ;

[0058] Fig.30 This is a schematic diagram of the use of split flow treatment in the refrigerant flow path of the indoor heat exchanger in one embodiment of the utility model duct machine Figure 2 ;

[0059] Fig.31 It is a cross-sectional view of an embodiment of the utility model air duct machine;

[0060] Fig.32 This is a schematic diagram of an embodiment of the utility model of a ducted air conditioner in which the first refrigerant flow path does not adopt a split flow treatment. Figure 1 ;

[0061] Fig.33 This is a schematic diagram of an embodiment of the utility model of a ducted air conditioner in which the first refrigerant flow path does not adopt a split flow treatment. Figure 2 ;

[0062] Fig.34 It is a cross-sectional view of another embodiment of the utility model air duct machine;

[0063] Fig.35 It is a cross-sectional view of another embodiment of the utility model air duct machine;

[0064] Fig.36 This is a schematic diagram of the internal structure of a machine body in one embodiment of the utility model air duct machine;

[0065] Fig.37 It is a schematic structural diagram of an indoor heat exchanger in an embodiment of the utility model air duct machine, which is a two-fold heat exchanger;

[0066] Fig.38It is a structural schematic diagram of a solenoid valve disposed at the inlet of the first refrigerant flow path in one embodiment of the utility model duct machine;

[0067] Fig.39 It is a structural block diagram of an embodiment of the multi-split air conditioning system of the utility model;

[0068] Fig.40 It is a flow chart of the temperature compensation steps in one embodiment of the multi-split air conditioning system of the utility model;

[0069] Fig.41 It is the control logic before the heating start of the indoor unit including the electronic expansion valve in one embodiment of the multi-split air conditioning system of the utility model;

[0070] Fig.42 It is the control logic before the heating start of the indoor unit including the air guide plate in one embodiment of the multi-split air conditioning system of the utility model;

[0071] Fig.43 This is the control logic before the heating of the target indoor unit is started in one embodiment of the multi-split air conditioning system of the utility model.

[0072] In the above figures: indoor unit 100; outdoor unit 200; compressor 201; outdoor heat exchanger 202; machine body 10; outdoor heat exchanger 20; accommodating chamber 101; air inlet 102; air outlet 103; top plate 104; bottom plate 105; first side plate 106; second side plate 107; rear panel 1081; air inlet filter assembly 1; heat exchanger assembly 2; indoor heat exchanger 21; first section heat exchanger 212; first windward surface 2121; second windward surface 2122; second section heat exchanger 213; third section heat exchanger 214; refrigerant flow path 215; first refrigerant flow path 2151; second refrigerant flow path 21 52; heat exchange tube 216; straight tube 2161; elbow 2162; connecting tube 217; first end plate 22; second end plate 23; fan assembly 3; crossflow fan 31; drive motor 32; base 38; electric auxiliary heating assembly 4; water receiving tray 5; temperature detection assembly 6; ambient temperature sensor 61; sensor bracket 62; mounting portion 621; first connecting port 622; mounting port 624; guide portion 63; wire passing portion 64; blocking portion 65; threading hole 66; electrical box 72; inlet pipe assembly 8; shunt pipe 81; blind pipe 82; inlet straight pipe 83; shunt 84; inlet pipe 85; solenoid valve 9; outlet pipe assembly 11. DETAILED DESCRIPTION

[0073] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0074] Reference to "embodiment" in the present invention means that a particular feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present application may be combined with other embodiments without conflict.

[0075] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0076] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the present application, the central air-conditioning duct-type indoor unit (duct unit for short) belongs to an air conditioner, which includes a duct unit (i.e., the indoor unit of the air conditioner) and an outdoor unit (i.e., the outdoor unit of the air conditioner). The air conditioner performs a refrigeration cycle of the indoor unit by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0079] The air duct machine provided by the embodiment of the utility model can have various implementation forms.

[0080] in, Figures 1 to 38This is an illustrative embodiment of the duct air conditioner 100 of the utility model. The duct air conditioner 100 is arranged indoors, can be installed in the ceiling and on the ceiling, and can be used as a living room air conditioner, a curtain air conditioner, and a ceiling air conditioner for heat exchange with the indoor environment. The air conditioner may include an outdoor unit, which is usually arranged outdoors to bring indoor heat to the outdoors.

[0081] refer to Figure 1 to Figure 3 The duct machine 100 includes a machine body 10. The machine body 10 can be installed in a suspended ceiling.

[0082] The body 10 has a top end and a bottom end, and the top end and the bottom end of the body 10 are two opposite ends of the body 10 in the vertical direction (thickness direction of the body 10). The left side of the body 10 and the right side of the body 10 are two opposite sides in the length direction of the body 10, and the front side of the body 10 and the rear side of the body 10 are two opposite sides in the width direction of the body 10.

[0083] refer to Figure 4 The housing 10 defines a receiving chamber 101 inside. The receiving chamber 101 is used to receive and fix various components in the duct machine 100, which can prevent foreign objects from colliding with various components in the housing 10, thereby improving the reliability of the duct machine 100 during transportation or installation.

[0084] In some embodiments of the present application, reference Figure 2 The body 10 may include an air conditioning air inlet 102 .

[0085] The air inlet 102 is in communication with the accommodating chamber 101 . The air inlet 102 serves as an inlet for the external air of the machine body 10 to flow in, allowing the indoor air to enter the accommodating chamber 101 through the air inlet 102 .

[0086] In some embodiments of the present application, reference Figure 3 The body 10 may include an air conditioning outlet 103 .

[0087] The air conditioning outlet 103 is in communication with the accommodating chamber 101 , and serves as an outlet for the heat exchange airflow in the machine body 10 to flow out, allowing the airflow in the accommodating chamber 101 to flow out through the air conditioning outlet 103 .

[0088] The air inlet 102 and the air outlet 103 are respectively disposed at two ends of the machine body 10 in the width direction thereof. That is, the air inlet 102 and the air outlet 103 are disposed opposite to each other in the width direction of the machine body 10 .

[0089] refer to Figure 5The body 10 may include a top plate 104. The top plate 104 forms the top of the body 10. The body 10 may include a bottom plate 105. The bottom plate 105 forms the bottom of the body 10, and the top and the bottom are two opposite ends of the body 10 in the thickness direction thereof.

[0090] The machine body 10 may include two side panels. The two side panels are two opposite ends of the machine body 10 in its length direction and are connected to the left and right sides of the top plate 104. The two side panels are a first side panel 106 and a second side panel 107.

[0091] The machine body 10 may include a front panel. The front panel forms the front end of the machine body 10 and is provided with an air conditioning outlet 103 .

[0092] The body 10 may include a rear panel 1081. The rear panel 1081 forms the rear end of the body 10, and the rear panel 1081 is provided with an air-conditioning air inlet 102.

[0093] The top plate 104 , the bottom plate 105 , the two side plates, the front plate and the rear plate together form a receiving cavity 101 .

[0094] Among them, the top plate 104, the bottom plate 105, the side plates, and the front and rear panels 1081 can be connected in a separate manner or in an integrated manner.

[0095] In this embodiment, the two ends of the side panels in the width direction of the body 10 are respectively bent and extended toward the opposite side to form a part of the front panel and the rear panel. Therefore, the top panel 104, the bottom panel 105 and the end parts surrounded by the two side panels form the air conditioning inlet 102 located at the rear side of the body 10 and the air conditioning outlet 103 located at the front side of the body 10.

[0096] It should be noted that the direction described in the article is based on the direction in which the user faces the duct machine 100, wherein the side facing the user when the duct machine 100 is in use is defined as the front side, the opposite side is defined as the rear side, the left and right sides are distinguished by the direction in which the user faces the duct machine 100, and the upper and lower sides of the duct machine 100 when it is generally working normally are defined to distinguish the up and down.

[0097] The air duct machine 100 may include a heat exchanger assembly 2. The heat exchanger assembly 2 is disposed in the accommodating chamber 101. Figure 4 The heat exchanger assembly 2 may include an indoor heat exchanger 21. The indoor heat exchanger 21 is used to perform heat exchange with the air entering the body 10.

[0098] The air duct machine 100 may include a fan assembly 3. The fan assembly 3 is disposed in the accommodating chamber 101. Figure 4The fan assembly 3 may include a cross-flow fan 31. Under the action of the cross-flow fan 31, the indoor air outside the body 10 enters the accommodating chamber 101 through the air conditioning inlet 102, and the air in the accommodating chamber 101 may flow along the air conditioning inlet 102 toward the air conditioning outlet 103.

[0099] When the duct air conditioner 100 is in operation, under the action of the cross-flow fan 31, the indoor air enters the accommodating chamber 101 through the air-conditioning air inlet 102, and the indoor air in the accommodating chamber 101 flows through the indoor-indoor heat exchanger 21 for heat exchange, and the heat exchanged air flows outwardly to the room through the air-conditioning air outlet 103, thereby making the air conditioner cool and heat, play the role of regulating the indoor temperature to achieve a comfortable temperature for the user.

[0100] In this embodiment, due to the characteristics of the cross-flow fan 31, the cross-flow fan 31 is arranged close to the air outlet 103 of the air conditioner, and the indoor heat exchanger 21 is arranged close to the air inlet 102 of the air conditioner. In other words, the cross-flow fan 31 is located between the air outlet 103 of the air conditioner and the indoor heat exchanger 21, and the cross-flow fan 31 rotates to introduce indoor air from the air inlet 102 into the machine body 10, and the air-conditioned air is formed after heat exchange in the indoor heat exchanger 21 and is sent out from the air outlet 103 of the air conditioner.

[0101] In this embodiment, the indoor heat exchanger 21 can be a multi-stage heat exchanger. The indoor heat exchanger 21 includes a multi-stage heat exchanger, which is connected from top to bottom, so that the indoor heat exchanger 21 is a semi-enclosed structure, and part of the cross-flow fan 31 is arranged in the semi-enclosed structure of the indoor heat exchanger 21, so that the cross-flow fan 31 and the indoor heat exchanger 21 are originally separated and arranged to overlap the cross-flow fan 31 and the indoor heat exchanger 21, and the space occupied by the indoor heat exchanger 21 and the cross-flow fan 31 is greatly reduced under the condition that the volume of the cross-flow fan 31 and the indoor heat exchanger 21 remains unchanged.

[0102] The cross-flow fan 31 is extended along the length direction of the machine body 10. That is, the length direction of the machine body 10 is the axial direction of the cross-flow fan 31. Since the cross-flow fan 31 is small in size, the volume of the duct machine 100 is further reduced, the depth of the ceiling is reduced, the narrow depth requirement is met, the problem of the oppressive feeling in the room is solved, and the aesthetics of the room is improved.

[0103] Continue to refer Figure 6 The duct machine 100 may include an electric auxiliary heating component 4. The electric auxiliary heating component 4 is detachably connected to the heat exchanger component 2 and is used to heat the airflow in the machine body 10.

[0104] In some embodiments of the present application, reference Figure 5 , Figure 7The air duct machine 100 may include a water receiving pan 5. The water receiving pan 5 is arranged at the bottom of the accommodating chamber 101 to receive the condensed water flowing down from the indoor heat exchanger 21 when the air duct machine 100 is working. The water receiving pan 5 is provided with a drain port to discharge the condensed water in the water receiving pan 5 out of the air duct machine 100.

[0105] In some embodiments of the present application, the fan assembly 3 may include a base 38. The base 38 is disposed in the accommodating cavity 101 to install the fan assembly 3 and the heat exchanger assembly 2.

[0106] In some embodiments of the present application, continue to refer to Figure 7 The base 38 is provided with a first mounting groove 381 at one end in the length direction thereof. The first mounting groove 381 is located at one end in the axial direction of the cross-flow fan 31 .

[0107] The driving motor 32 is installed in the first installation groove 381 , and the output shaft of the driving motor 32 is connected to the shaft sleeve of the cross-flow fan 31 through a fixing screw to drive the cross-flow fan 31 to rotate.

[0108] The duct machine 100 may include an electric control component, wherein the electric control component may include an electric control board, and the electric control board is electrically connected to the electric components inside the machine body 10 through an electric control line.

[0109] It is understandable that the electric control board is configured to be electrically connected to the compressor 201, the expansion valve and the cross-flow fan 31 at least through electric control to control at least the compressor 201, the expansion valve and the cross-flow fan 31. The electric control board can transmit signals with the wire controller or the remote controller through the communication line. The wire controller or the remote controller sends an air conditioning control signal to control the air conditioner, and the electric control board receives the air conditioning control signal to control the operation of the duct machine 100.

[0110] The heat exchanger assembly 2 may include an end plate. The end plate is located in the body 10. Two end plates are provided, and the two end plates are respectively connected to the two ends of the indoor heat exchanger 21 in the length direction, and are used to fix the indoor heat exchanger 21.

[0111] refer to Fig.11 The two end plates are respectively a first end plate 22 and a second end plate 23. The first end plate 22 is connected to one end of the indoor heat exchanger 21 in the length direction, and the second end plate 23 is connected to the other end of the indoor heat exchanger 21 in the length direction.

[0112] The second end plate 23 may be connected to the base 38 to support the indoor heat exchanger 21 so as to be fixed on the base 38 .

[0113] The second end plate 23 is disposed at one end of the indoor heat exchanger 21, for example, the left end, to avoid stress concentration in the connection structure of the indoor heat exchanger 21 and improve the structural stability of the indoor heat exchanger 21. The indoor heat exchanger 21 is penetrated by the second end plate 23. The second end plate 23 can be formed into a ring frame structure. The second end plate 23 can be sleeved on the end of the indoor heat exchanger 21.

[0114] By setting a second end plate 23 connected to the base 38, the second end plate 23 can not only effectively fix the indoor heat exchanger 21 on the base 38, but also prevent the indoor heat exchanger 21 from falling from a certain height and inertia-damaging the body 10 during transportation, thereby improving the structural stability and service life of the duct machine 100.

[0115] The outdoor unit may include an outdoor housing. An outdoor heat exchange air duct may be provided in the outdoor housing. The outdoor housing may include an outdoor air inlet. The outdoor air inlet may be connected to the outdoor heat exchange air duct. The outdoor air inlet may be used to introduce outdoor air into the outdoor heat exchange air duct.

[0116] The outdoor housing may include an outdoor air outlet, which may be connected to the outdoor heat exchange air duct, and may be used to lead the air in the outdoor heat exchange air duct out of the outdoor heat exchange air duct.

[0117] The outdoor unit may include an outdoor heat exchanger. The outdoor heat exchanger may be arranged in an outdoor heat exchange air duct. The outdoor unit may include an outdoor fan. The outdoor fan may be arranged in the outdoor heat exchange air duct. The rotation of the outdoor fan causes outdoor air to enter the heat exchange air duct from the outdoor air inlet to exchange heat with the outdoor heat exchanger, and the outdoor air after heat exchange flows out of the outdoor heat exchange air duct from the outdoor air outlet.

[0118] The air conditioner may include a compressor 201. The compressor 201 is disposed in an outdoor heat exchange air duct. The compressor 201 compresses the refrigerant gas in a low-temperature and low-pressure state to discharge the refrigerant gas in a high-temperature and high-pressure state, and the discharged refrigerant gas flows into the condenser.

[0119] The air conditioner may include a throttling device. The throttling device is used for throttling. The throttling device may be provided in the duct unit 100 or the outdoor unit.

[0120] The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor 201, a condenser, a throttling device and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0121] The condenser condenses the compressed refrigerant into liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0122] The throttling device expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The throttling device may be an expansion valve.

[0123] The evaporator evaporates the refrigerant expanded in the throttling device and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 201 .

[0124] The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0125] Among the indoor heat exchanger 21 and the outdoor heat exchanger, one is a condenser and the other is an evaporator. When the indoor heat exchanger 21 is used as a condenser, the air conditioner is used as a heater in the heating mode, and when the indoor heat exchanger 21 is used as an evaporator, the air conditioner is used as a cooler in the cooling mode.

[0126] refer to Figure 7 to Figure 18 The duct machine 100 may include a temperature detection component 6. The temperature detection component 6 is disposed on the machine body 10. The temperature detection component 6 may include an ambient temperature sensor 61. The ambient temperature sensor 61 is used to detect the indoor ambient temperature.

[0127] The ambient temperature sensor 61 is connected to the electric control board for communication so as to transmit the detected indoor ambient temperature to the electric control board, thereby controlling various actions of the subsequent duct unit 100 .

[0128] In the related art, the ambient temperature sensor 61 usually passes through the end plate at one end of the indoor heat exchanger 21 from the inside and then needs to be tied with wires, which reduces production efficiency and increases costs.

[0129] To facilitate the installation of the ambient temperature sensor 61, refer to Figure 7 to Figure 10 The temperature detection assembly 6 may include a sensor bracket 62. The sensor bracket 62 is fixed on the end plate and is used to install the ambient temperature sensor 61.

[0130] refer to Fig.12 The sensor bracket 62 is formed with a mounting portion 621 for clamping and fixing the temperature sensor. By providing the sensor bracket 62, the ambient temperature sensor 61 is clamped and fixed without wire tying, the structure is simple, and the assembly is convenient and fast, saving costs.

[0131] In this embodiment, the sensor bracket 62 is disposed on the second end plate 23. Of course, in some other embodiments, the sensor bracket 62 may be disposed on the first end plate 22.

[0132] The installation portion 621 is in communication with the indoor environment, and the ambient temperature sensor 61 is embedded in the installation portion 621 so that the temperature sensor detects the indoor ambient temperature.

[0133] The temperature detection assembly 6 may include a through hole, wherein the through hole is formed on the end plate to connect the mounting portion 621 with a portion of the accommodating cavity 101 on the side of the end plate away from the sensor bracket. In other words, the through hole connects the mounting portion 621 with a portion of the accommodating cavity 101 on the inner side of the end plate.

[0134] In this embodiment, the through-hole is provided so that the air near the sensor bracket 62 can flow when the cross-flow fan 31 rotates.

[0135] It is understandable that if the location of the ambient temperature sensor 61 is set reasonably, it can provide accurate indoor ambient temperature, so that the air conditioner can operate (cooling, heating, etc.) accurately. If the location of the ambient temperature sensor 61 is improperly set, it is very easy for the ambient temperature sensor 61 to be affected by condensed water, indoor heat exchanger 21, refrigerant temperature, etc., which can easily lead to abnormal shutdown, abnormal startup, etc., affecting the normal use of users.

[0136] In the related art, the ambient temperature sensor 61 is too close to the indoor heat exchanger 21, and the detected temperature data is inaccurate due to the influence of the temperature of the indoor heat exchanger 21, which leads to inaccurate air conditioning control action, reduces the user experience, and affects the product experience.

[0137] In order to improve the detection accuracy of the ambient temperature sensor 61 on the indoor ambient temperature, provide the electric control board with accurate indoor ambient temperature, and realize accurate air conditioning operation, in this embodiment, the sensor bracket 62 is fixed on the side of the end plate away from the indoor heat exchanger 21.

[0138] Among them, the sensor bracket 62 is arranged close to the air inlet of the air conditioner, so that the ambient temperature sensor 61 is arranged close to the air inlet of the air conditioner 102, which can effectively detect the temperature of the indoor air and avoid being affected by the heat exchange air, so as to achieve the purpose of detecting the indoor ambient temperature.

[0139] The sensor bracket 62 is located on a side of the end plate away from the indoor heat exchanger 21. That is, in the length direction of the machine body, the sensor bracket 62 is arranged away from the indoor heat exchanger 21 relative to the end plate, that is, the sensor bracket 62 is arranged on the outer side of the end plate.

[0140] The duct air conditioner provided in this embodiment arranges the ambient temperature sensor 61 on the side of the end plate away from the indoor heat exchanger 21, so that there is an end plate blocking the ambient temperature sensor 61 and the indoor heat exchanger 21, thereby weakening the influence of the indoor heat exchanger 21 on the indoor ambient temperature detected by the ambient temperature sensor 61, improving the detection accuracy of the indoor ambient temperature, avoiding inaccurate air-conditioning control, and improving the user experience.

[0141] In this example, when the duct unit 100 is assembled, the ambient temperature sensor 61 can be pre-installed on the end plate of the heat exchanger assembly 2 , and then the evaporator assembly is installed in the machine body 10 .

[0142] For further information, please refer to Fig.12 In some embodiments, the sensor bracket 62 is provided with a first communication port 622, and the first communication port 622 is used to connect the mounting portion 621 with the indoor environment. The first communication port 622 is connected with the through port through the mounting portion 621 to form an air flow passage.

[0143] In this embodiment, by providing an air flow passage, when the duct air conditioner is working, the cross-flow fan 31 rotates to drive the indoor air to enter the air conditioner through the air inlet of the air conditioner. The cross-flow fan 31 rotates to drive the indoor air around the ambient temperature sensor 61 to flow through the ambient temperature sensor 61 through the air flow passage, thereby improving the temperature detection accuracy, so that the ambient temperature sensor 61 can accurately detect the indoor ambient temperature.

[0144] In some embodiments of the present application, a blocking portion 65 is connected to the sensor bracket 62 .

[0145] Continue to refer Fig.12 The blocking portion 65 is disposed at the first communicating port 622 to limit the ambient temperature sensor 61 from escaping from the first communicating port 622 , thereby improving the installation firmness of the ambient temperature sensor 61 .

[0146] In some embodiments of the present application, the minimum distance L between the ambient temperature sensor 61 and the indoor heat exchanger 21 is greater than 10 mm.

[0147] Specifically, there is an end plate blocking the ambient temperature sensor 61 and the indoor heat exchanger 21, which weakens the influence of the indoor heat exchanger 21 on the indoor ambient temperature detected by the ambient temperature sensor 61, thereby making the minimum distance between the ambient temperature sensor 61 and the indoor heat exchanger 21 smaller than that in the prior art, thereby increasing the range of the installation position of the ambient temperature sensor 61.

[0148] In the related art, the ambient temperature sensor 61 is mostly set near the top of the end plate, and the temperature of the refrigerant in the indoor heat exchanger 21 will also affect the detection accuracy of the ambient temperature sensor 61. For example: in a certain state, the indoor heat exchanger 21 has refrigerant circulating in it, and when the indoor heat exchanger 21 is hot, the cold air around the indoor heat exchanger 21 exchanges heat with the indoor heat exchanger 21. After the exchange, the hot air floats due to its light specific gravity, and the hot air is easily surrounded by the ambient temperature sensor 61. At this time, if a heating command is received, the temperature detected by the ambient temperature sensor 61 is higher than the command set temperature, and the duct air conditioner 100 will shut down and not operate, affecting the user's use.

[0149] In order to solve the above technical problems, in some embodiments of the present application, the sensor bracket 62 is fixed on the end plate and is arranged close to the bottom end of the end plate.

[0150] In this embodiment, by arranging the sensor bracket 62 close to the bottom end of the end plate, the sensor bracket 62 is arranged at the lower part of the end plate, so that the temperature detected by the ambient temperature sensor 61 is closer to the room temperature, and the detection of the indoor ambient temperature is more accurate.

[0151] In some other embodiments, reference Fig.13 The sensor bracket 62 can be fixed on the rear panel 1081. A mounting portion 621 is formed between the sensor bracket 62 and the rear panel 1081. The mounting portion 621 is connected to the indoor environment. The ambient temperature sensor 61 is embedded in the mounting portion 621 to detect the indoor ambient temperature.

[0152] The duct air conditioner provided in this embodiment realizes the clamping and fixing of the ambient temperature sensor 61 by setting the sensor bracket 62, and does not need to be fixed by wire tying, and has a simple structure and is convenient and quick to assemble. By setting the sensor bracket 62 on the rear panel, the ambient temperature sensor 61 is set on the rear panel, which not only makes the ambient temperature sensor 61 far away from the indoor heat exchanger 21, but also makes the ambient temperature sensor 61 and the indoor heat exchanger 21 blocked by an organic body, and the indoor ambient temperature detected by the ambient temperature sensor 61 is not affected by the indoor heat exchanger 21, thereby improving the detection accuracy, avoiding inaccurate air conditioning control action, and improving the user experience.

[0153] In some embodiments of the present application, a mounting opening 624 is formed on the sensor bracket 62 , and the mounting opening 624 is located at one end of the mounting portion 621 in the length direction.

[0154] refer to Fig.12 The installation opening 624 is connected to the installation portion 621 for the ambient temperature sensor 61 to pass through. During assembly, the ambient temperature sensor 61 is installed in the installation portion 621 through the installation opening 624, which facilitates the installation of the ambient temperature sensor 61.

[0155] When the sensor bracket 62 is fixed on the outer side of the end plate, the sensor bracket 62 can extend along the length direction of the machine body, or the sensor bracket 62 can extend along the width direction of the machine body. When the sensor bracket 62 is fixed on the end plate and extends along the length direction of the machine body, the installation opening 624 can be arranged to overlap with the through opening.

[0156] In some embodiments of the present application, reference Fig.13The rear panel is provided with a threading hole 66. The threading hole 66 is communicated with the accommodating cavity, and the threading hole 66 is for the electric control line of the ambient temperature sensor 61 on the rear panel to pass through.

[0157] In this embodiment, when the ambient temperature sensor 61 is mounted on the rear panel, it is inserted into the mounting portion 621 through the mounting opening 624, and the electric control wire of the ambient temperature sensor 61 is sequentially passed through the threading hole 66 and the wire passing portion 64 to be electrically connected to the electric control board. The threading hole 66 is provided to facilitate the routing of the ambient temperature sensor 61.

[0158] In some embodiments of the present application, reference Figures 14 to 18 The sensor bracket 62 is fixed on the side of the end plate close to the indoor heat exchanger 21 (the inner side of the end plate) for installing the ambient temperature sensor 61.

[0159] That is to say, the sensor bracket 62 is located in the air flow channel between the air conditioning inlet 102 and the indoor heat exchanger 21, so that the temperature sensor is located between the air conditioning inlet 102 and the indoor heat exchanger 21, which can effectively detect the temperature of the indoor air entering through the air conditioning inlet 102 to achieve the purpose of detecting the indoor ambient temperature.

[0160] In order to improve the detection accuracy of the indoor ambient temperature by the ambient temperature sensor 61, the electric control board is provided with an accurate indoor ambient temperature, so as to realize accurate air conditioning operation. Fig.16 , the minimum distance L between the ambient temperature sensor 61 and the indoor heat exchanger 21 is set to be greater than 15 mm.

[0161] The minimum distance between the ambient temperature sensor 61 and the indoor heat exchanger 21 is greater than 15 mm, so that the distance between the ambient temperature sensor 61 and the indoor heat exchanger 21 is farther, weakening the influence of the indoor heat exchanger 21 on the indoor ambient temperature detected by the ambient temperature sensor 61, improving the accuracy of temperature detection, avoiding inaccurate air-conditioning control, and improving user experience.

[0162] In some embodiments of the present application, a wire passing portion 64 is provided on the side of the end plate away from the indoor heat exchanger 21. The wire passing portion 64 is used for passing the electric control wire of the ambient temperature sensor 61. At least one wire passing portion 64 may be provided.

[0163] In this embodiment, the wire passing portion 64 is a wire clamp structure for allowing the wire harness to pass through and clamping the wire harness.

[0164] By providing the wire passing portion 64 for the electric control wire of the ambient temperature sensor 61 to pass through, there is no need to tie the wires together, which is convenient and quick.

[0165] In some embodiments of the present application, continue to refer to Fig.17An electrical box 72 is disposed at one end of the machine body 10 in the length direction. The electrical control board is disposed inside the electrical box 72. The electrical control board is electrically connected to the ambient temperature sensor 61.

[0166] In order to facilitate the electrical connection between the electric control line of the ambient temperature sensor 61 and the electric control board, in this embodiment, the electric box 72 is arranged close to the sensor bracket 62. For example, the sensor bracket 62 is arranged close to the left end of the machine body 10, and the electric box 72 is arranged at the left end of the machine body 10.

[0167] In this embodiment, the electric control line of the ambient temperature sensor 61 passes through the wire portion 64 and is electrically connected to the electric control board. By arranging the electrical box 72 close to the sensor bracket 62, the length of the electric control line of the ambient temperature sensor 61 is shortened, which facilitates the wiring and wiring arrangement, and saves costs.

[0168] When assembling, the ambient temperature sensor 61 is inserted into the mounting portion 621 through the mounting opening 624 , and the electric control wire of the ambient temperature sensor 61 passes through the wire portion 64 and is electrically connected to the electric control board.

[0169] In some embodiments of the present application, when the sensor bracket 62 is fixed on the inner side of the end plate, the air duct machine 100 further includes a guide portion 63. The guide portion 63 is arranged on the side of the end plate close to the middle of the machine body 10.

[0170] refer to Fig.18 The air guide 63 is disposed on the second end plate 23 and is located above the sensor bracket 62. In the vertical direction, the air guide 63 is close to the indoor heat exchanger 21 relative to the sensor bracket 62.

[0171] By providing the guide part 63, the condensed water flowing down from the end plate on the indoor heat exchanger 21 can be guided to prevent the condensed water from flowing into the ambient temperature sensor 61 on the inner side of the end plate, thereby increasing the service life of the ambient temperature sensor 61 and preventing the condensed water from affecting the detection accuracy of the ambient temperature sensor 61.

[0172] In some embodiments of the present application, the guide portion 63 is tilted from top to bottom toward the direction close to the indoor heat exchanger 21. The guide portion 63 may be a guide groove structure, which can guide the condensed water and also play a receiving role.

[0173] The guide part 63 is arranged to be inclined from top to bottom toward the indoor heat exchanger 21 , so that the condensed water flowing down the end plate is guided through the guide part 63 in a direction away from the ambient temperature sensor 61 , thereby effectively preventing the condensed water from entering the ambient temperature sensor 61 .

[0174] In the above embodiment, the ambient temperature sensor 61 is installed on the end plate or the rear plate through the sensor bracket 62, which can be close to the position of the electric control panel and can meet the difference between the detected value of the indoor ambient temperature and the actual indoor ambient temperature when the cross-flow fan 31 is running or not within a certain range. At the same time, when the temperature of the inner coil reaches above 50°C, the difference between the detected value of the indoor ambient temperature and the actual indoor ambient temperature is within a first threshold; once the air is supplied, that is, the detected value of the indoor ambient temperature when the cross-flow fan 31 is running, the difference between the actual indoor ambient temperature and the second threshold. Among them, the second threshold is less than the first threshold.

[0175] refer to Figure 19 to Figure 28 In some embodiments of the present application, the indoor heat exchanger 21 is a three-fold heat exchanger, and the two end plates are respectively connected to the two ends in the length direction of the indoor heat exchanger 21. The distance between the two end plates is not less than 1000 mm.

[0176] The indoor heat exchanger 21 may include a plurality of heat exchange tubes 216 , and the plurality of heat exchange tubes 216 are connected to form a plurality of refrigerant flow paths 215 arranged in parallel.

[0177] Among them, reference Fig.23 , the heat exchange tube 216 is a U-shaped tube. Specifically, the heat exchange tube 216 may include two straight tubes 2161. The straight tube 2161 extends along the length direction of the body, and both ends of the straight tube 2161 in the length direction extend to the two end plates. In other words, the length dimension of the straight tube 2161 is the distance dimension between the two end plates.

[0178] Since the distance between the two end plates is relatively large, the length of the straight tube 2161 is relatively long. In order to reduce the pressure drop during cooling, in some embodiments of the present application, the refrigerant flow path 215 may include at most three heat exchange tubes 216 connected in sequence.

[0179] In some embodiments of the present application, the refrigerant flow path 215 is used for the refrigerant to flow, wherein the length of the refrigerant flow path 215 does not exceed 7000 mm.

[0180] The duct air conditioner provided in this embodiment sets the flow path length of the refrigerant flow path 215 to no more than 7000 mm, thereby avoiding excessive pressure drop in each refrigerant flow path 215 during cooling, thereby improving the heat exchange capacity of the indoor heat exchanger 21.

[0181] In the related art, the heat exchange tube 216 in the indoor heat exchanger 21 mostly adopts a small-diameter internally threaded tube, i.e., a fine-threaded tube. The fine-threaded tube will increase the pressure loss (pressure drop) of the refrigerant when flowing in the indoor heat exchanger 21. In order to reduce the pressure loss of each refrigerant flow path 215, the number of refrigerant flow paths 215 of the indoor heat exchanger 21 will increase. With the increase in the number of flow paths, it is difficult to ensure the consistency of the refrigerant temperature at the outlets of each flow path of the indoor heat exchanger 21, resulting in a decrease in the heat exchange capacity.

[0182] In addition, in the related art, the inlet pipe 85 in the inlet pipe assembly 8 is bent and directly connected to the diversion inlet of the diverter 84. When the flowing refrigerant passes through the curved pipe, it is subjected to the centrifugal force, causing the liquid refrigerant to deviate from the outer circle, resulting in uneven diversion of the refrigerant, which affects the heat exchange capacity of the indoor heat exchanger 21.

[0183] In order to solve the above technical problems, in some embodiments of the present application, reference is made to Fig.24 A shunt pipe 81 is provided at the inlet pipe 85 in the inlet pipe assembly 8 .

[0184] Specifically, the inlet pipe assembly 8 may include a diverter pipe 81. The diverter pipe 81 is a three-way piece.

[0185] The flow dividing pipe 81 may include a horizontal pipe section that extends in a horizontal direction, and a first end of the horizontal pipe section is connected to one end of the inlet pipe 85 .

[0186] The flow dividing pipe 81 may include a vertical pipe section, which is vertically connected to the horizontal pipe section, one end of which is vertically connected to the horizontal pipe section, and the other end of which is connected to the flow dividing inlet of the flow divider 84 .

[0187] The inlet pipe assembly 8 may include a blind pipe 82. One end of the blind pipe 82 is closed and the other end is connected to the second end of the horizontal pipe section. In this embodiment, the blind pipe 82 is provided to make the flow direction of the refrigerant before the diverter 84 consistent, thereby making the diversion of the refrigerant more uniform, thereby improving the reliability and consistency of the diversion.

[0188] Specifically, in the cooling mode, when the refrigerant passes through the inlet pipe 85 and reaches the diversion pipe 81, it can destroy the effect of centrifugal force on the flow of the refrigerant, overcome the influence of the dynamic pressure generated when the refrigerant flows in the pipeline on the refrigerant diversion, and ultimately achieve uniform diversion by using the static pressure principle, achieve consistency in the outlet temperature of the refrigerant diversion path, balance the heat exchange intensity of each refrigerant diversion path, and avoid the attenuation of the heat exchange capacity of the indoor heat exchanger 21.

[0189] In some embodiments of the present application, the inlet pipe assembly 8 may include an inlet straight pipe 83 , wherein the vertical pipe section is connected to the split flow inlet through the inlet straight pipe 83 .

[0190] In this embodiment, the provision of the inlet straight pipe 83 does not affect the uniformity of the flow diversion, thereby ensuring the uniformity of the flow diversion.

[0191] In some embodiments of the present application, the indoor heat exchanger 21 includes heat exchange fins, and a plurality of heat exchange tubes 216 are inserted through the heat exchange fins.

[0192] The three-fold heat exchanger has three-fold heat exchange fins. The heat exchange fins have a windward side and a leeward side, and a plurality of heat exchange tubes 216 are arranged in two rows from the windward side to the leeward side. This arrangement makes the indoor heat exchanger 21 a double-row heat exchanger, which can perform more rapid and thorough heat exchange on the passing air, thereby further improving the heat exchange quality.

[0193] The refrigerant flow path 215 may include at least one heat exchange tube 216 close to the windward side.

[0194] The refrigerant flow path 215 may include at least one heat exchange tube 216 near the leeward side. The refrigerant flow path 215 is formed by connecting at least one heat exchange tube 216 near the windward side and at least one heat exchange tube 216 near the leeward side end to end through a connecting tube.

[0195] The above-mentioned arrangement makes the refrigerant flow path 215 a double-row pipeline, and makes the arrangement of the refrigerant flow path 215 on the indoor heat exchanger 21 more uniform and reasonable, so that the heat exchange amounts of different parts of the indoor heat exchanger 21 are similar during operation, thereby improving the heat exchange effect of the indoor heat exchanger 21, and preventing the condensation phenomenon caused by the large outlet temperature difference of multiple refrigerant flow paths 215.

[0196] In some embodiments of the present application, when the wind speed deviation between each heat exchange tube 216 reaches less than 0.7 m / s, the number of heat exchange tubes 216 included in each of the plurality of refrigerant flow paths 215 is the same. In other words, the path length of the refrigerant flow in each refrigerant flow path 215 is the same.

[0197] Specifically, in this embodiment, the indoor heat exchanger 21 includes 18 U-shaped tubes, which are divided into 6 refrigerant flow paths 215 .

[0198] refer to Fig. 22 When the wind speed deviation between each heat exchange tube 216 reaches below 0.7 m / s, each refrigerant flow path 215 is evenly divided into 3 heat exchange tubes 216 to ensure that the length and number of each U-shaped tube are the same.

[0199] In this embodiment, the distribution of wind field flow velocity for each refrigerant flow path 215 is relatively uniform. When the wind speed deviation of each U-shaped tube is within 0.7m / s, the refrigerant flow path 215 uses an equal distribution scheme to make the refrigerant heat exchange performance in each refrigerant flow path 215 close, thereby improving the heat exchange capacity of the indoor heat exchanger 21.

[0200] The refrigerant flow for equal distribution is not limited to Fig. 22 According to the change of wind field, the refrigerant flow of indoor heat exchanger 21 can be designed as follows Fig. 27 As shown. Fig. 22 In comparison, the number of U-shaped tubes on the windward side and the leeward side of the refrigerant flow path 215 is partially replaced mainly according to the wind field.

[0201] In some embodiments of the present application, when the wind speed deviation between each heat exchange tube 216 exceeds 0.7 m / s, the number of heat exchange tubes 216 included in each refrigerant flow path 215 is inversely proportional to the wind volume or wind speed at the location of the refrigerant flow path 215. In other words, the greater the wind volume at the location of the refrigerant flow path 215 and the better the heat exchange performance, the fewer the number of heat exchange tubes 216 included in the refrigerant flow path 215.

[0202] In this embodiment, when the flow velocity of the wind field is uneven, the number of heat exchange tubes 216 in the refrigerant flow path 215 is set according to the wind volume or wind speed to improve the heat exchange performance of the indoor heat exchanger 21.

[0203] Specifically, when the wind speed deviation between each heat exchange tube 216 exceeds 0.7 m / s, the equal division scheme of the refrigerant flow path 215 cannot meet the flow splitting design. Therefore, in order to give full play to the performance of the indoor heat exchanger 21, the number of U-shaped tubes of the refrigerant flow path 215 is increased at the position where the air volume or wind speed on the air inlet side of the indoor heat exchanger 21 is small and the heat exchange performance is poor, thereby improving the heat exchange efficiency of the refrigerant flow path 215 at this position.

[0204] At the position where the wind speed or air volume is high and the heat exchange performance is good on the air inlet side of the indoor heat exchanger 21, the number of heat exchange tubes 216 in the refrigerant flow path 215 is reduced. Although the number of heat exchange tubes 216 is reduced, the high-speed air at this position increases the heat exchange efficiency of the refrigerant flow path 215, so as to maximize the use of the outside air and avoid the waste of the external air flow. In addition, the heat exchange efficiency of the refrigerant flow path 215 at high and low wind speeds on the indoor heat exchanger 21 is uniform, thereby improving the overall heat exchange efficiency of the indoor heat exchanger 21 when the external air flow environment remains unchanged.

[0205] refer to Fig.28 Among them, the wind speed in the upper part of the second heat exchanger 213 is relatively large, and the number of heat exchange tubes 216 is reduced in the refrigerant flow path 215 at this position. The wind speed in the lower part of the first heat exchanger 212 is relatively small compared to other heat exchangers. Therefore, the number of heat exchange tubes 216 is increased in the refrigerant flow path 215 at this position.

[0206] In some embodiments of the present application, reference Fig.25 The first section heat exchanger 212 and the second section heat exchanger 213 are completely cut apart at the joint portion thereof. The first section heat exchanger 212 and the second section heat exchanger 213 are plugged and arranged at a first preset angle.

[0207] Specifically, in the above embodiment, the first section heat exchanger 212 and the second section heat exchanger 213 are fully cut. This arrangement makes the angle between the first section heat exchanger 212 and the bottom plate not restricted by the structure, thereby improving the arrangement flexibility of the first section heat exchanger 212. At the same time, the fin area of ​​the first section heat exchanger 212 and the second section heat exchanger 213 can be in contact with enough, thereby making it easier for the condensed water to flow from the first preset angle to the bottom.

[0208] In some embodiments of the present application, reference Fig.26 The first section heat exchanger 212 and the second section heat exchanger 213 are an integrated structure, and the connection between the first section heat exchanger 212 and the second section heat exchanger 213 is formed into a bending angle by special-shaped cutting, thereby improving the production efficiency of the indoor heat exchanger 21.

[0209] In this embodiment, the first heat exchanger 212 and the second heat exchanger 213 are an integrated structure, and the integrated structure is cut and bent to obtain the first heat exchanger 212 and the second heat exchanger 213 that are arranged at an angle.

[0210] Specifically, the indoor heat exchanger 21 includes a heat exchange fin, on which a special-shaped cutting structure is provided. The special-shaped cutting structure divides the heat exchanger fin into a first section of heat exchange fins and a second section of heat exchange fins, and the heat exchange fins are bent according to the shape of the special-shaped cutting structure so that a preset angle is formed between the first section of heat exchange fins and the second section of heat exchange fins.

[0211] In some embodiments of the present application, the indoor heat exchanger 21 is a three-fold heat exchanger.

[0212] The indoor heat exchanger 21 may include a plurality of heat exchange tubes 216 , and the plurality of heat exchange tubes 216 are connected to form a plurality of refrigerant flow paths 215 , and the plurality of refrigerant flow paths 215 are arranged in parallel.

[0213] refer to Fig. 27 In this embodiment, the ends of a plurality of heat exchange tubes 216 are connected via connecting tubes 217 to form six parallel refrigerant flow paths 215 .

[0214] The heat exchanger assembly 2 may include an end plate. The end plate is located inside the body 10.

[0215] Two end plates are provided, and the two end plates are respectively connected to two ends of the indoor heat exchanger 21 in the length direction, and are used to fix the indoor heat exchanger 21 .

[0216] In some embodiments of the present application, the distance between the two end plates is not less than 1000 mm.

[0217] It can be understood that the three-fold heat exchanger includes three heat exchange fins, and a plurality of heat exchange tubes 216 are arranged in the three heat exchange fins. Among them, the heat exchange tubes 216 are U-shaped tubes.

[0218] Specifically, the heat exchange tube 216 may include two straight tubes 2161, and the straight tubes 2161 extend along the length direction of the machine body. Both ends of the straight tubes 2161 in the length direction extend to two end plates.

[0219] The heat exchange tube 216 may include a bend tube 2162 , wherein adjacent ends of two straight tubes 2161 are connected via the bend tube 2162 .

[0220] In the above embodiment, since the distance between the two end plates is too large, the flow path of each refrigerant flow path 215 in the indoor heat exchanger 21 is relatively long, and the duct unit cannot exert its maximum capacity in cooling and heating states, resulting in poor market competitiveness.

[0221] In order to enable the duct air conditioner to exert its maximum capacity in cooling and heating states, in some embodiments of the present application, the refrigerant flow path 215 is diverted.

[0222] Specifically, refer to Fig.29 , Fig.30 The refrigerant flow path 215 may include one inlet. In the cooling mode, the refrigerant enters the corresponding refrigerant flow paths 215 through the multiple inlets.

[0223] The refrigerant flow path 215 may include two outlets. In the cooling mode, the refrigerant enters the corresponding refrigerant flow path 215 through the inlet and flows out of the refrigerant flow path 215 through the two outlets.

[0224] In this embodiment, in the cooling mode, each refrigerant flow path 215 is set to have one inlet and two outlets, that is, each refrigerant flow path 215 is diverted. This can greatly reduce the pressure drop during cooling and meet the refrigerant flow state during heating. The refrigerant flow rate can be increased under the same compressor frequency, and the heating capacity is improved, so that the duct unit can exert its maximum capacity under the cooling and heating states.

[0225] In some embodiments of the present application, reference Fig.31 , a refrigerant flow path 215 relatively close to the bottom plate among the plurality of refrigerant flow paths 215 is defined as a first refrigerant flow path 2151 , and at least a portion of the remaining refrigerant flow paths except the first refrigerant flow path 2151 is diverted.

[0226] Specifically, the first refrigerant flow path 2151 is located at the bottom of the indoor heat exchanger 21. In the cooling mode, condensed water accumulates at the bottom of the indoor heat exchanger 21, so that the heat exchange capacity of the first refrigerant flow path 2151 is poorer than that of other refrigerant flow paths. In this embodiment, the first refrigerant flow path 2151 is not diverted to ensure the heat exchange capacity of the first refrigerant flow path 2151 and avoid making its heat exchange capacity worse.

[0227] refer to Figure 31 to Figure 33 The first refrigerant flow path 2151 may include an inlet through which the refrigerant enters the first refrigerant flow path 2151 .

[0228] The first refrigerant flow path 2151 may include an outlet. The refrigerant enters the first refrigerant flow path 2151 through the inlet and flows out of the first refrigerant flow path 2151 through the outlet.

[0229] The duct machine provided in this embodiment, in the cooling mode, except for the first refrigerant flow path 2151, at least part of the other refrigerant flow paths are set as one inlet and two outlets, that is, at least one of the other refrigerant flow paths 215 is shunted, so that the pressure drop can be greatly reduced during cooling, and the refrigerant flow state is met during heating. The refrigerant flow rate can be increased at the same compressor frequency, and the heating capacity is improved, so that the duct machine can exert its maximum capacity in the cooling and heating states. In addition, in the cooling mode, the first refrigerant flow path 2151 is not shunted to ensure the heat exchange capacity of the first refrigerant flow path 2151, thereby ensuring the heat exchange effect of the entire indoor heat exchanger 21.

[0230] The three-fold heat exchanger may include a first stage heat exchanger 212. Fig.31 The first stage heat exchanger 212 is located below the cross-flow fan 31 .

[0231] In some embodiments of the present application, the duct unit may include a water receiving pan 5. The water receiving pan 5 is disposed on the bottom plate 105 and is located below the indoor heat exchanger 21 to receive condensed water dripping from the indoor heat exchanger 21 in the cooling mode.

[0232] In some embodiments, the first refrigerant flow path 2151 close to the bottom plate is disposed on the first heat exchanger 212. The inlet and outlet of the first refrigerant flow path 2151 are disposed on the first heat exchanger 212.

[0233] By arranging the first refrigerant flow path 2151 and the inlet and outlet of the first refrigerant flow path 2151 on the first heat exchanger 212, the arrangement of the first refrigerant flow path 2151 on the indoor heat exchanger 21 is made more uniform and reasonable, thereby improving the heat exchange effect of the first refrigerant flow path 2151.

[0234] An acute angle is formed between the first heat exchanger 212 and the horizontal plane where its free end is located, with the opening facing the air inlet of the air conditioner, so as to facilitate the gathering of condensed water in the first refrigerant flow path 2151 .

[0235] The first section heat exchanger 212 and the horizontal plane where the free end thereof is located form an acute angle with the opening facing the air inlet 102 of the air conditioner. The first section heat exchanger 212 is a plate-shaped heat exchanger.

[0236] Specifically, an acute angle is formed between the first heat exchanger 212 and the horizontal plane where the free end of the first heat exchanger 212 is located, so that the first heat exchanger 212 is tilted, and the opening of the angle faces the air inlet 102 of the air conditioner, so that the free end of the first heat exchanger 212 is lower than its connection end. When the duct mechanism is in cooling operation, the condensed water on the indoor heat exchanger 21 can be gathered at its free end and drip into the water receiving tray 5.

[0237] In the related art, there is a technical solution in which the first section heat exchanger 212 is arranged in parallel with the bottom plate 105. This solution will cause the condensed water on the indoor heat exchanger 21 to gather on the first section heat exchanger 212, which is not conducive to improving the heat exchange efficiency. In this embodiment, the first section heat exchanger 212 is arranged at an angle. Compared with the prior art, it not only prevents the condensed water from gathering on the bottom surface of the entire first section heat exchanger 212, but also increases the air intake of the first section heat exchanger 212, thereby improving the heat exchange capacity of the first section heat exchanger 212.

[0238] In some embodiments of the present application, reference Fig.31 The indoor heat exchanger 21 may include a second stage heat exchanger 213. The second stage heat exchanger 213 is located above the first stage heat exchanger 212, and one end of the second stage heat exchanger 213 is connected to one end of the first stage heat exchanger 212.

[0239] The indoor heat exchanger 21 may include a third-stage heat exchanger 214 , wherein the third-stage heat exchanger 214 is located above the second-stage heat exchanger 213 , and the third-stage heat exchanger 214 is connected to the other end of the second-stage heat exchanger 213 .

[0240] That is, the first stage heat exchanger 212, the second stage heat exchanger 213 and the third stage heat exchanger 214 are sequentially connected from bottom to top to form a semi-enclosed structure. The semi-enclosed structure has an opening toward the cross-flow fan 31 to surround a portion of the cross-flow fan 31, so that the indoor heat exchanger 21 semi-encloses the outer periphery of the cross-flow fan 31, thereby improving the heat exchange efficiency of the indoor heat exchanger 21.

[0241] In some embodiments of the present application, double rows of heat exchange tubes 216 are disposed in the first heat exchanger 212 , the second heat exchanger 213 , and the third heat exchanger 214 .

[0242] By providing double rows of heat exchange tubes 216 in the first heat exchanger 212, the second heat exchanger 213 and the third heat exchanger 214, the indoor heat exchanger 21 is a double row heat exchanger, so that the indoor heat exchanger 21 can perform more rapid and thorough heat exchange on the passing air, thereby further improving the heat exchange quality.

[0243] In some embodiments of the present application, the heat exchange tube 216 is an internally threaded tube, and the inner diameter of the internally threaded tube does not exceed 5 mm, so that the indoor heat exchanger 21 can obtain a greater heat exchange capacity in the same heat exchanger area as much as possible. In this embodiment, the heat exchange tube 216 is a 5mm internally threaded copper tube.

[0244] The internally threaded pipe is arranged on the indoor heat exchanger 21, and the flow direction of the refrigerant is guided by the internally threaded pipe in the indoor heat exchanger 21. Among them, the internally threaded pipes in the refrigerant flow path 215 are all designed to be straight-inserted, which is more convenient to operate and has higher processing efficiency.

[0245] The friction coefficient inside the 5mm internally threaded copper tube is large, and the refrigerant flow resistance is large, which leads to a greater pressure drop of the 5mm internally threaded copper tube. Therefore, in order to further ensure a reasonable pressure drop of the refrigerant inside the indoor heat exchanger 21 and give full play to the performance of the indoor heat exchanger 21, in some other embodiments, the indoor heat exchanger 21 using the 5mm internally threaded copper tube needs to increase the number of branches of the diversion accordingly.

[0246] In some embodiments of the present application, at least six refrigerant flow paths 215 are configured. The number of refrigerant flow paths 215 is determined within a reasonable range, so that the pressure drop of the indoor heat exchanger 21 is within a normal range during cooling, and the temperature at the diversion outlet is consistent to ensure the heat exchange capacity.

[0247] In this embodiment, six refrigerant flow paths 215 are provided. By increasing the number of flow paths, the refrigerant flow velocity in the tube can be effectively reduced, thereby reducing the flow resistance.

[0248] In some embodiments of the present application, each refrigerant flow path 215 includes the same number of heat exchange tubes 216 , and each heat exchange tube 216 has the same length.

[0249] refer to Fig.31 The indoor heat exchanger 21 may include 18 U-shaped tubes (heat exchange tubes 216), which are divided into 6 refrigerant flow paths 215. Each refrigerant flow path 215 is evenly divided into 3 U-shaped tubes to ensure that the length and number of each U-shaped tube are the same. In this embodiment, the refrigerant flow path 215 is evenly divided to improve the uniformity of the refrigerant flow.

[0250] In some embodiments of the present application, the six refrigerant flow paths 215 are all configured as double-row pipelines. In the cooling mode, this configuration allows the refrigerant in each refrigerant flow path 215 to be fully evaporated, thereby reducing the temperature difference between the refrigerant flow paths 215.

[0251] In some embodiments of the present application, the indoor heat exchanger 21 may include 10 to 26 U-shaped tubes. It is understandable that the number of U-shaped tubes in the indoor heat exchanger 21 can be reasonably set according to the limitations of the machine body and the crossflow fan 31. The number of U-shaped tubes can be increased or decreased on the basis of ensuring that the indoor heat exchanger 21 does not interfere with the machine body structure after being placed in the machine body and can exert the performance of the crossflow air duct.

[0252] In some embodiments of the present application, a refrigerant flow path 215 having one inlet and two outlets is defined as a second refrigerant flow path 2152 .

[0253] refer to Fig.31 The second refrigerant flow path 2152 may include a plurality of heat exchange tubes 216. In the cooling mode, the refrigerant entering the second refrigerant flow path 2152 from the inlet passes through at least one heat exchange tube 216 and is split by the claw-shaped tee pipe to form two refrigerant paths, which flow out of the second refrigerant flow path 2152 from the two outlets respectively.

[0254] Specifically, the refrigerant entering the second refrigerant flow path 2152 from the inlet can pass through different numbers of heat exchange tubes 216 and then be split by the claw-type three-way pipe to form two paths, which can handle different pressure drops. Among them, when the pressure drop exceeds 300kPa, the refrigerant entering the second refrigerant flow path 2152 from the inlet can pass through one heat exchange tube 216 and then be split by the claw-type three-way pipe to form two paths, so as to reduce the large pressure drop by splitting. When the pressure drop reaches below 300kPa, the refrigerant entering the second refrigerant flow path 2152 from the inlet can pass through at least two heat exchange tubes 216 and then be split by the claw-type three-way pipe to form two paths.

[0255] refer to Fig.34 In some embodiments of the present application, in the width direction of the machine body, a first gap L8 is provided between an end of the third-stage heat exchanger 214 away from the second-stage heat exchanger 213 and an outer edge of the cross-flow fan 31 .

[0256] The duct air conditioner provided in this embodiment ensures that in the cooling mode, condensed water overflowing from the top of the third heat exchanger 214 will not fall onto the cross-flow fan 31 under the action of gravity, by setting a first gap between the third heat exchanger 214 and the cross-flow fan 31 in the width direction of the machine body, thereby effectively preventing the water blowing problem and improving the user experience.

[0257] In some embodiments of the present application, there is no overlapping area between the downward projection of the third-stage heat exchanger 214 along the vertical direction and the downward projection of the cross-flow fan 31 along the vertical direction.

[0258] The duct air conditioner provided in this embodiment ensures that in the cooling mode, condensed water overflowing from the top of the third section heat exchanger 214 will not fall vertically downward onto the cross-flow fan 31 under the action of gravity, by setting the downward projections of the third section heat exchanger 214 and the cross-flow fan 31 in the vertical direction to have no overlapping area, thereby effectively preventing the water blowing problem and improving the user experience.

[0259] In some embodiments of the present application, an acute angle is formed between the third stage heat exchanger 214 and the top plate. in,

[0260] refer to Fig.35 , acute angle The opening faces the air inlet of the air conditioner.

[0261] Sharp Angle It cannot be too small, because if it is too small, the windward vertical area of ​​the third stage heat exchanger 214 will be reduced, and thus its heat exchange area cannot be effectively utilized. If the angle is too small, the condensed water will be discharged slowly from the third heat exchanger 214 during cooling, which will reduce the heat exchange capacity of the third heat exchanger 214. The first parameter value may be set to be not less than the first parameter value. For example, the first parameter value may be 10°, 13°, or 15°. When designing specifically, consider selecting a suitable specific parameter.

[0262] Sharp Angle It cannot be too large, otherwise the third section heat exchanger 214 will occupy a higher proportion of the entire body, making it difficult to ensure that the heat exchanger below is at a reasonable angle. If the angle is too large, the distance between the indoor heat exchanger 21 and the air inlet of the air conditioner will be too large, and the wind field will more easily form a large eddy zone above, resulting in a decrease in the overall air volume. The angle is set to be no greater than the second parameter value. For example, the second parameter value may be 30°, 27°, or 25°. When designing specifically, consider selecting a suitable and specific parameter.

[0263] In some embodiments of the present application, an acute angle is formed between the third stage heat exchanger 214 and the top plate. in,

[0264] In this embodiment, by Make reasonable settings to make it sharp The angle is set to any angle value between 10° and 30°, so as to increase the discharge speed of the condensed water on the first stage heat exchanger 212 while ensuring the air intake, and to increase the heat exchange capacity of the third stage heat exchanger 214.

[0265] In some embodiments of the present application, an acute angle is formed between the second stage heat exchanger 213 and the bottom plate. in,

[0266] Continue to refer Fig.35 , acute angle The opening faces the air inlet of the air conditioner.

[0267] Sharp Angle It cannot be too small. If it is too small, it will make it difficult for the condensed water in the upper part to drip directly from the second heat exchanger 213 to the water receiving pan. Instead, it will be discharged to the first heat exchanger 212 and then drip onto the water receiving pan, resulting in poor heat exchange of the first heat exchanger 212 under cooling. The angle is set to be not less than the third parameter value. For example, the third parameter value may be 40°, 43°, or 45°. When designing specifically, consider selecting a suitable and specific parameter.

[0268] Sharp Angle It cannot be too large. If it is too large, the second heat exchanger 213 will be almost vertical, affecting the angles of other heat exchangers. At the same time, since the second heat exchanger 213 occupies most of the vertical windward area, the first heat exchanger 212 and the third heat exchanger 214 will be unevenly divided, greatly affecting the capacity of the indoor heat exchanger 21. In order to improve the heat exchange capacity of the entire indoor heat exchanger 21, the acute angle The angle is set to be no greater than the fourth parameter value. For example, the fourth parameter value may be 80°, 78°, or 75°. When designing specifically, consider selecting a suitable and specific parameter.

[0269] In some embodiments of the present application, an acute angle is formed between the second stage heat exchanger 213 and the bottom plate. in,

[0270] In this embodiment, by It is reasonably set so that it can be any angle of 40° to 80° to ensure that in the cooling mode, the condensed water on the second heat exchanger 213 can drip directly into the water receiving tray to avoid accumulation on the first heat exchanger 212. At the same time, the heat exchange capacity of the first heat exchanger 212 and the entire indoor heat exchanger 21 is improved to avoid increasing the height of the machine body.

[0271] In some embodiments of the present application, an acute angle is formed between the first stage heat exchanger 212 and the bottom plate. in,

[0272] Continue to refer Fig.35 , acute angle The opening faces the air inlet of the air conditioner.

[0273] Sharp Angle Cannot be too small, even if the upper part of the condensed water is discharged to the lower part by the second fold heat exchanger, too small an acute angle This will cause the remaining condensed water to be discharged too slowly, still resulting in poor heat exchange effect of the third stage heat exchanger 214. The gap between the indoor heat exchanger 21 and the water tray is too small, resulting in low air intake at the bottom, poor flow distribution of the entire indoor heat exchanger 21, or increased height of the machine body. The angle is set to be not less than the fifth parameter value. For example, the fifth parameter value may be 15°, 17°, or 19°. When designing specifically, consider selecting a suitable and specific parameter.

[0274] Sharp Angle It cannot be too large. If it is too large, the first heat exchanger 212 will occupy a higher proportion of the entire body, making it difficult to position the remaining heat exchangers at a reasonable angle. The angle is set to be no greater than the sixth parameter value. For example, the sixth parameter value may be 28°, 28°, or 25°. When designing specifically, consider selecting a suitable and specific parameter.

[0275] In some embodiments of the present application, an acute angle is formed between the first stage heat exchanger 212 and the bottom plate. in,

[0276] In this embodiment, by The heat exchange capacity of the first heat exchanger 212 is improved without increasing the height of the whole machine, and the sharp angle is avoided. The unreasonable setting increases the size of the machine body and affects the heat exchange efficiency of the indoor heat exchanger 21.

[0277] In some embodiments of the present application, the duct air conditioner further includes a water receiving tray, which is disposed inside the air conditioner body and below the indoor heat exchanger 21 .

[0278] There is a second gap between the first stage heat exchanger 212 and the bottom wall of the water receiving tray to increase the air intake of the lower part of the first stage heat exchanger 212. It is understandable that the second gap can be reasonably set according to the height of the machine body, while increasing the air intake of the first stage heat exchanger 212, while avoiding affecting the height size of the machine body.

[0279] In some embodiments of the present application, the first-stage heat exchanger 212 and the second-stage heat exchanger 213 may be connected by a full-cut or special-shaped cutting method.

[0280] Specifically, after the first section heat exchanger 212 and the second section heat exchanger 213 are completely cut apart at their connecting parts, the two are plugged and arranged at a first preset angle. The angle of the first section heat exchanger 212 is not limited by the structure, and the fin areas of the two sections of the heat exchanger are in contact with each other sufficiently, so that the condensed water can flow to the bottom more easily from the first preset angle.

[0281] In some embodiments of the present application, the first heat exchanger 212 and the second heat exchanger 213 are an integrated structure. The connection between the first heat exchanger 212 and the second heat exchanger 213 is formed into a bending angle by special-shaped cutting, thereby improving the production efficiency of the indoor heat exchanger 21.

[0282] refer to Figure 36 to Figure 38 In some embodiments of the present application, the indoor heat exchanger 21 has a plurality of refrigerant flow paths 215, and the refrigerant flow paths 215 have an inlet and an outlet.

[0283] The ducted air conditioner may include an inlet pipe assembly 8. The inlet pipe assembly 8 is connected to the inlets of multiple refrigerant flow paths 215. In the cooling mode, the refrigerant in the inlet pipe assembly 8 is respectively injected into the corresponding refrigerant flow paths 215 through different inlets, and the refrigerant in the refrigerant flow paths 215 flows out from the corresponding outlets.

[0284] In this embodiment, reference Fig.36 , define the refrigerant flow path relatively close to the bottom plate among the multiple refrigerant flow paths 215 as the first refrigerant flow path 2151. Define the inlet of the first refrigerant flow path 2151 as the first inlet, and define the outlet of the first refrigerant flow path 2151 as the first outlet. That is, in this embodiment, the first refrigerant flow path 2151 is a refrigerant flow path with a single inlet and a single outlet.

[0285] refer to Fig.38 The duct machine may include a solenoid valve 9. The solenoid valve 9 is connected between the inlet pipe assembly 8 and the first inlet.

[0286] The electromagnetic valve 9 has a slightly open state and a fully open state. In the fully open state, the refrigerant flow through the electromagnetic valve 9 is greater than the refrigerant flow through the electromagnetic valve 9 in the slightly open state.

[0287] In the cooling mode, the solenoid valve 9 is in a slightly open state so that the refrigerant in the inlet pipe assembly 8 enters the first refrigerant flow path 2151 through the first inlet; in the heating mode, the solenoid valve 9 is in a fully open state so that the refrigerant in the first refrigerant flow path 2151 flows out through the solenoid valve 9.

[0288] Specifically, in the cooling mode, the solenoid valve 9 is in a slightly open state, and the refrigerant in the inlet pipe assembly 8 enters the first refrigerant flow path 2151 through the first inlet, and flows out of the first refrigerant flow path 2151 through the first outlet. In the heating mode, the solenoid valve 9 is in a fully open state, and the refrigerant in the first refrigerant flow path 2151 flows out through the first inlet and flows out to the inlet pipe assembly 8 through the solenoid valve 9.

[0289] The duct air conditioner provided in this embodiment connects a solenoid valve 9 with two states, namely, slightly open and fully open, between the inlet pipe assembly 8 and the first inlet of the first refrigerant flow path 2151. By controlling the solenoid valve 9, the duct air conditioner has different diversion states under different cooling and heating conditions, so that its cooling capacity and heating capacity can be fully exerted.

[0290] Specifically, when the cooling mode is started, the solenoid valve 9 is in a slightly open state. At this time, the refrigerant flow rate flowing through the first refrigerant flow path 2151 is small, so the diversion superheat is better; when the heating mode is started, the solenoid valve 9 is in a fully open state, and the refrigerant flow path of the first refrigerant flow path 2151 is larger, so that the heat exchange is better in the heating state, so the supercooling is better, which effectively balances the cooling and heating capacities of the duct air conditioner, so that the cooling and heating diversion reaches a better state.

[0291] In some embodiments of the present application, the duct unit may include an inlet pipe assembly 8, which is connected to the inlets of the plurality of refrigerant flow paths, so that the refrigerant is injected into the refrigerant flow paths through the inlets in the cooling mode. The duct unit may include an electromagnetic valve 9. The electromagnetic valve 9 is connected between the inlet pipe assembly 8 and the first inlet to control the refrigerant flow rate flowing into the first refrigerant flow path 2151.

[0292] Specifically, the opening degree of the solenoid valve 9 in the cooling mode is smaller than that in the heating mode, so that the refrigerant flow rate of the first refrigerant flow path 2151 in the cooling mode is smaller than that in the heating mode; wherein, the opening degree of the solenoid valve 9 in the heating mode is the maximum opening degree.

[0293] The duct air conditioner provided in this embodiment connects the solenoid valve 9 between the inlet pipe assembly 8 and the first inlet of the first refrigerant flow path 2151, so that the refrigerant flow of the first refrigerant flow path 2151 in the cooling mode is less than the refrigerant flow in the heating mode, that is, the first refrigerant flow path 2151 is throttled in the cooling mode to reduce its refrigerant flow, thereby increasing its shunt superheat. In the heating mode, the opening of the solenoid valve 9 is the maximum opening, and the first refrigerant flow path 2151 is not affected by the throttling and is extremely overcooled, avoiding affecting its heating capacity, and being able to balance the capacity of the duct air conditioner in the cooling and heating states.

[0294] In some embodiments of the present application, the solenoid valve 9 is a two-position normally open solenoid valve 9 .

[0295] Specifically, when the cooling mode is running, the two-position normally open solenoid valve 9 is powered on. At this time, the solenoid valve 9 is in a slightly open state, and the refrigerant flow through the first refrigerant flow path 2151 is small, so the shunt superheat is better. When the heating mode is running, the two-position normally open solenoid valve 9 is powered off, and the solenoid valve 9 is in a fully open state. The first refrigerant flow path 2151 has a good heat exchange in the heating state, so the supercooling is better, so the air conditioning can balance the cooling and heating states.

[0296] In this embodiment, by adopting a two-position normally open solenoid valve 9, the different diversion states of the duct unit under different cooling and heating conditions are controlled, so that its cooling capacity and heating capacity can be fully exerted. The two-position normally open solenoid valve 9 is simple to operate and easy to control.

[0297] In some embodiments of the present application, the indoor heat exchanger 21 includes at least two sections of heat exchangers, and the at least two sections of the heat exchangers are sequentially connected from top to bottom to form a semi-enclosed structure. The semi-enclosed structure has an opening toward the cross-flow fan 31, so that the indoor heat exchanger 21 can semi-surround the cross-flow fan 31, thereby improving the heat exchange capacity of the indoor heat exchanger 21.

[0298] Specifically, the heat exchanger relatively close to the bottom plate among the at least two heat exchangers is defined as the first heat exchanger 212. The first refrigerant flow path 2151 and the first outlet and the first inlet thereof are formed on the first heat exchanger 212.

[0299] In this embodiment, by arranging the first refrigerant flow path 2151 and the first inlet and the first outlet of the first refrigerant flow path 2151 on the first section heat exchanger 212, the arrangement of the first refrigerant flow path 2151 on the indoor heat exchanger 21 is more uniform and reasonable, thereby improving the heat exchange effect of the first refrigerant flow path 2151.

[0300] In some embodiments of the present application, an acute angle is formed between the first-section heat exchanger 212 and the bottom plate, with the opening facing the air inlet of the air conditioner, so that in the cooling mode, condensed water on the indoor heat exchanger 21 can gather and drip at the bottom end of the first-section heat exchanger 212, thereby increasing the air intake volume flowing through the first-section heat exchanger 212.

[0301] In some embodiments of the present application, the first stage heat exchanger 212 includes a plurality of heat exchange tubes 216 , and the plurality of heat exchange tubes 216 are arranged in two rows, namely an inner row close to the cross-flow fan 31 and an outer row away from the cross-flow fan 31 .

[0302] refer to Fig.37 A heat exchange tube 216 in the inner row near the bottom plate is connected to at least one heat exchange tube 216 in the outer row near the bottom plate to form a first refrigerant flow path 2151. It can be understood that at least two heat exchange tubes 216 are connected end to end through a connecting tube 27 to form a refrigerant flow path 215.

[0303] The first refrigerant flow path 2151 includes a heat exchange tube 216 in the inner row close to the bottom plate, and at least one heat exchange tube 216 in the outer row close to the bottom plate, so that the process setting of the first refrigerant flow path 2151 on the first section heat exchanger 212 is more reasonable, so that its cooling capacity and heating capacity can be fully exerted.

[0304] In some embodiments of the present application, the indoor heat exchanger 21 may include a plurality of heat exchange tubes 216. The plurality of heat exchange tubes 216 are connected by connecting tubes to form a plurality of refrigerant flow paths 215 in parallel.

[0305] The number of heat exchange tubes 216 in each refrigerant flow path 215 is the same, so that the refrigerant heat exchange performance of each refrigerant flow path 215 is close and each refrigerant flow path 215 has the same pressure drop.

[0306] In some embodiments of the present application, reference Fig.24 The inlet pipe assembly 8 may include a flow divider 84. The flow divider 84 has a flow divider inlet and a plurality of flow divider outlets, and a plurality of refrigerant flow paths 215 are connected to different flow divider outlets.

[0307] The inlet pipe assembly 8 may include an inlet pipe 85. The inlet pipe 85 is connected to the flow splitting inlet. In the cooling mode, the refrigerant enters the flow splitter 84 through the inlet pipe 85, is split inside the flow splitter 84, and is injected into the multiple refrigerant flow paths 215 through multiple flow splitting outlets.

[0308] The duct machine may include an outlet pipe assembly 11 , wherein the outlet pipe assembly 11 is connected to outlets of a plurality of refrigerant flow paths 215 .

[0309] In the cooling mode, the refrigerant flows into the plurality of refrigerant flow paths 215 via the inlet pipe assembly 8 , and the refrigerant in the plurality of refrigerant flow paths 215 is collected in the outlet pipe assembly 11 and flows out via the outlet pipe assembly 11 .

[0310] The specific structural design of the outlet pipe assembly 11 can adopt the same technical solution as the inlet pipe assembly 8, so its structure will not be described in detail.

[0311] The present application also provides a multi-split air conditioning system. Figure 39 to Figure 43 In an exemplary embodiment of the multi-split air conditioning system of the present application, reference is made to Fig.39 , the multi-split air conditioning system can include an outdoor unit.

[0312] The outdoor unit 200 is usually arranged outdoors to bring indoor heat to the outdoors. The outdoor unit 200 may include an outdoor heat exchanger 202 .

[0313] The outdoor unit may include a compressor 201. The compressor 201 compresses the refrigerant gas in a low-temperature and low-pressure state to discharge the refrigerant gas in a high-temperature and high-pressure state, and the discharged refrigerant gas flows into the condenser.

[0314] refer to Fig.39 The multi-split air conditioning system may include an indoor unit 100. The indoor unit 100 is usually arranged indoors for exchanging heat with the indoor environment.

[0315] The indoor unit 100 includes a plurality of indoor units connected in parallel. The plurality of indoor units are connected to the outdoor unit 200. The plurality of indoor units are arranged in different rooms, and the indoor units can be arranged as the duct units of the above-mentioned embodiment.

[0316] The multi-split air conditioning system may include a controller which is electrically connected to the indoor unit and the outdoor unit to control the operation of the components inside the controller so that the components of the multi-split air conditioning system can operate to realize the predetermined functions of the multi-split air conditioning system.

[0317] In the embodiments shown in the present application, the controller refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner to execute the control instruction. For example, in response to receiving a power-on or power-off instruction issued by a user, the controller can execute an operation related to the object selected by the power-on or power-off instruction.

[0318] Exemplarily, the controller may be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller may also be other devices with processing functions, such as circuits, devices, or software modules, and the embodiments of the present application do not impose any restrictions on this.

[0319] The indoor unit includes a body 10. The body 10 may include an air conditioning inlet 102. The air conditioning inlet 102 is connected to the accommodating chamber 101. The air conditioning inlet 102 serves as an inlet for the external air to flow into the body 10, allowing indoor air to enter the accommodating chamber 101 through the air conditioning inlet 102.

[0320] The machine body 10 may include an air conditioning outlet 103 . The air conditioning outlet 103 is in communication with the accommodating chamber 101 , and serves as an outlet for the heat exchange airflow in the machine body 10 to flow out, allowing the airflow in the accommodating chamber 101 to flow out through the air conditioning outlet 103 .

[0321] The indoor unit may include a heat exchanger assembly 2. The heat exchanger assembly 2 is disposed in the accommodating chamber 101.

[0322] The heat exchanger assembly 2 may include an indoor heat exchanger 21, which is disposed near the air inlet 102 of the air conditioner and is used to perform heat exchange with the air entering the machine body 10. The plurality of indoor heat exchangers 21 are respectively connected to the outdoor heat exchanger 202 through multi-channel refrigerant pipes.

[0323] The indoor unit may include a fan assembly 3. The fan assembly 3 is disposed in the accommodating chamber 101. Figure 4 The fan assembly 3 may include a cross-flow fan 31 .

[0324] The cross-flow fan may include a cross-flow fan 31. The cross-flow fan 31 is located between the indoor heat exchanger 21 and the air-conditioning outlet 103. Under the action of the cross-flow fan 31, the indoor air outside the body 10 enters the accommodating chamber 101 through the air-conditioning inlet 102, and is output to the room through the air-conditioning outlet 103 after heat exchange through the indoor heat exchanger 21.

[0325] The cross-flow fan may include a driving motor 32. The driving motor 32 is connected to one end of the cross-flow fan 31 in the axial direction to drive the cross-flow fan 31 to rotate.

[0326] The indoor unit may include a temperature detection component 6. The temperature detection component 6 may include an ambient temperature sensor 61, and the ambient temperature sensor 61 is used to detect the indoor ambient temperature to provide a basis for subsequent temperature compensation.

[0327] There is a communication connection between the ambient temperature sensor 61 and the controller, so that the ambient temperature sensor 61 transmits data information to the controller. The ambient temperature sensor 61 detects the indoor ambient temperature in real time and transmits it to the controller in the form of an electrical signal to participate in subsequent control.

[0328] The controller may include an indoor controller and an outdoor controller. The indoor controller may include an electric control panel of an indoor unit.

[0329] The air duct unit may include a coil temperature detection device. The coil temperature detection device is arranged on the indoor heat exchanger 21 to detect the coil temperature of the indoor heat exchanger 21, and the coil temperature of the inner heat exchanger is defined as the inner coil temperature.

[0330] The coil temperature detection device is connected to the controller in communication so that the coil temperature detection device transmits data information to the controller. The coil temperature detection device detects the inner coil temperature in real time and transmits it to the controller in the form of an electrical signal to participate in subsequent control.

[0331] It can be arranged that the coil temperature detection device can be arranged on one of the coils in the middle of the indoor heat exchanger 21 , and the temperature of one of the coils in the middle of the coil temperature detection device is identified as the coil temperature of the indoor heat exchanger 21 .

[0332] When the multi-split air conditioning system is heating, some of the multiple indoor units are in the heating operation mode, and the other part of the multiple indoor units are not turned on. Although the cross-flow fan of the indoor unit that is not turned on is not running, the hot refrigerant will still flow in the indoor heat exchanger 21 of the indoor unit, causing the indoor heat exchanger 21 to exchange heat with the surrounding air, causing the local air temperature to change, thereby affecting the accuracy of the indoor ambient temperature detected by the ambient temperature sensor 61, and making an incorrect judgment on the indoor ambient temperature. When the indoor unit is started, it cannot be started.

[0333] In order to solve the above technical problems, when the multi-split air conditioning system is heating, another part of the indoor units that are not turned on are defined as the target indoor units, and the controller is configured as follows:

[0334] After the target indoor unit receives the heating command, determining whether the target indoor unit meets the preset compensation condition;

[0335] If yes, a temperature compensation value is obtained through a first logic operation according to the operating frequency of the compressor 201 and the internal coil temperature of the target indoor unit;

[0336] The indoor ambient temperature is compensated according to the temperature compensation value to obtain the compensated indoor ambient temperature, and the target indoor unit is controlled to enter a heating operation mode according to the compensated indoor ambient temperature.

[0337] refer to Fig.40 The controller may be configured to execute the correction and compensation steps of the indoor ambient temperature after the target indoor unit receives the heating instruction, including:

[0338] Determine whether the target indoor unit meets the preset compensation condition (step S1);

[0339] After executing step S1, if yes, that is, whether the target indoor unit meets the preset compensation condition, then execute step S2: obtain a temperature compensation value through a first logical operation according to the operating frequency of the compressor 201 and the internal coil temperature of the target indoor unit;

[0340] After executing step S2, execute step S3: compensate the indoor ambient temperature according to the temperature compensation value to obtain the compensated indoor ambient temperature, and control the target indoor unit to enter the heating operation mode according to the compensated indoor ambient temperature (step S4).

[0341] The multi-split air conditioning system provided in this embodiment obtains a temperature compensation value through a first logical operation according to the operating frequency of the compressor 201 and the internal coil temperature of the target indoor unit, that is, the temperature compensation of the indoor ambient temperature is performed according to the operating state of the outdoor unit and the internal coil temperature, so that the temperature compensation value is more accurate than the prior art, and the error between the compensated indoor ambient temperature and the actual indoor ambient temperature is ensured to be small, that is, the detection accuracy of the indoor ambient temperature before the multi-split unit starts heating under the preset compensation conditions is ensured. After temperature compensation, the compensated indoor ambient temperature is brought into the air conditioning system for direct heating operation, ensuring that the indoor unit is started in time and the user's comfort is guaranteed.

[0342] In some other embodiments of the present application, the indoor unit may be a duct unit in any of the above embodiments.

[0343] It should be noted that in multi-split air conditioning systems, the configuration varies according to different regions, and some will be equipped with an electronic expansion valve inside the indoor unit. Accordingly, the indoor unit equipped with an electronic expansion valve can control the flow of refrigerant by controlling the opening of the electronic expansion valve.

[0344] In this embodiment, in order to improve the detection accuracy of the indoor ambient temperature, when detecting the indoor ambient temperature before heating, different conditions are considered, such as whether there is an electronic expansion valve in the indoor unit and whether there is refrigerant flowing through the indoor heat exchanger 21 of the target indoor unit.

[0345] Furthermore, the controller is configured as follows:

[0346] After the target indoor unit receives the heating instruction, determining whether the target indoor unit includes an electronic expansion valve;

[0347] If yes, then obtain the working state of the electronic expansion valve, wherein the working state includes closed state and open state;

[0348] If the electronic expansion valve is in a closed state, the current indoor ambient temperature is sampled and the target indoor unit is controlled to directly enter a heating operation mode accordingly.

[0349] Specifically, refer to Fig.41 , after the target indoor unit receives the heating command, the controller is configured as follows:

[0350] Execute step S11: determine whether the target indoor unit includes an electronic expansion valve.

[0351] After executing step S11, if yes, that is, the target indoor unit includes an electronic expansion valve, then executing step S12: obtaining the working state of the electronic expansion valve, and determining whether the electronic expansion valve is in a closed state (step S13);

[0352] After executing step S13, if yes, that is, the electronic expansion valve is in the closed state, then execute step S14: control sampling of the current indoor ambient temperature; and control the target indoor unit to directly enter the heating operation mode according to the sampled current indoor ambient temperature (step S5).

[0353] If the indoor unit includes an electronic expansion valve, the electronic expansion valve needs to be electrically connected to the controller so that the controller controls the opening of the electronic expansion valve according to actual needs to control the flow of the refrigerant. It is understandable that the controller can directly detect whether the indoor unit has an electronic expansion valve.

[0354] In this embodiment, when it is determined that the target indoor unit includes an electronic expansion valve, and the electronic expansion valve of the target indoor unit remains closed in the standby state, it means that the refrigerant does not flow through the indoor heat exchanger 21. At this time, the indoor ambient temperature detected by the ambient temperature sensor 61 is the actual indoor ambient temperature, and the controller brings the indoor ambient temperature detected by the ambient temperature sensor 61 into the air conditioning system for direct heating operation, which can ensure that the target indoor unit is started in time.

[0355] In some other embodiments of the present application, the controller is further configured to: when the target indoor unit does not include an electronic expansion valve, or the electronic expansion valve of the target indoor unit is in an open state:

[0356] Determine whether the temperature of the inner coil reaches above the preset temperature;

[0357] If not, then control sampling of the current indoor ambient temperature, and control the target indoor unit to enter a heating operation mode according to the sampled indoor ambient temperature;

[0358] If yes, determine whether there is an air guide plate at the air outlet of the air conditioner of the target indoor unit.

[0359] Specifically, refer to Fig.42 The controller is configured as follows: after executing step S11, if not, that is, when the target indoor unit does not include an electronic expansion valve, executing step S15: determining whether the temperature of the inner coil reaches a preset temperature or above; or after executing step S13, if not, that is, the electronic expansion valve is in an open state, executing step S15: determining whether the temperature of the inner coil reaches a preset temperature or above.

[0360] In step S15, the inner coil temperature is Tin, the preset temperature is T, and it is determined whether Tin and T satisfy the judgment condition of Tin≥T.

[0361] After executing step S15, if no, that is, the temperature of the inner coil is less than the preset temperature, then execute step S14 and step S5 again, control the sampling of the current indoor ambient temperature, and control the target indoor unit to enter the heating operation mode according to the sampled indoor ambient temperature. If yes, that is, when the temperature of the inner coil is greater than or equal to the preset temperature, then execute step S16: determine whether there is an air guide plate at the air outlet of the air conditioner of the target indoor unit.

[0362] It should be noted that when the multi-split air-conditioning system is heating, the controller can program real-time recording of the internal coil temperature Tin. When the target indoor unit does not include an electronic expansion valve or the electronic expansion valve is in an open state, the program determines and compares the relationship between the internal coil temperature Tin and the preset temperature T, and executes step S14 or step S16 according to the comparison result.

[0363] In some embodiments, the indoor unit may include an air guide plate which is rotatably connected to the machine body to open or cover the air outlet of the air conditioner, and the air guide plate can guide the air flow out of the air outlet of the air conditioner when the air outlet of the air conditioner is opened.

[0364] The indoor unit may include an air guide plate motor, wherein the air guide plate motor is connected to the air guide plate and is used to drive the air guide plate to rotate and open or cover the air outlet of the air conditioner.

[0365] It is understandable that the air guide plate motor is electrically connected to the controller so that the air guide plate motor is controlled by the controller. The controller can detect whether there is an air guide plate at the air outlet of the indoor unit.

[0366] In this embodiment, when the electronic expansion valve is not detected or is in the open state, refrigerant flows through the indoor heat exchanger 21. Under this condition, the inner coil temperature and the preset temperature are compared. If the inner coil temperature is less than the preset temperature, it indicates that the compressor 201 of the outdoor unit is not running or is in a low-frequency operation stage, and the heat radiation of the indoor heat exchanger 21 of the target indoor unit has little effect on the ambient temperature sensor 61. Therefore, under this condition, the sampled indoor ambient temperature can be considered as the actual indoor ambient temperature, and heating operation can be performed directly to ensure that the target indoor unit is started in time and enters the heating operation mode.

[0367] In some other embodiments of the present application, the controller is further configured to:

[0368] If the target indoor unit has an air guide plate, the air guide plate is controlled to move to the open position;

[0369] The cross-flow fan is controlled to run at a first speed, and after a preset time, the current indoor ambient temperature is controlled to be sampled, and the target indoor unit is controlled to enter a heating operation mode according to the sampled indoor ambient temperature.

[0370] Specifically, continue to refer to Fig.42 After executing step S16, if yes, that is, the target indoor unit has an air guide plate, then the control executes step S17: controls the air guide plate to move to the open position. After executing step S17, execute step S18: controls the crossflow fan to run at the first speed for a preset time.

[0371] After executing step S18, step S14 and step S5 are executed again to control the sampling of the current indoor ambient temperature, and control the target indoor unit to enter the heating operation mode according to the sampled indoor ambient temperature.

[0372] In this embodiment, when the indoor unit has an air guide plate, the air guide plate is controlled to open the air outlet of the air conditioner, and the cross-flow fan is controlled to operate at the first speed for a preset time, so as to accelerate the heat dissipation of the target indoor unit and reduce the ambient temperature around the target indoor unit, so as to weaken the interference of the heat radiation of the indoor heat exchanger 21 on the detection value of the ambient temperature sensor 61. After the cross-flow fan operates at the first speed for a preset time, the error between the indoor ambient temperature detected by the ambient temperature sensor 61 and the actual indoor ambient temperature can be ignored. At this time, the indoor ambient temperature detected by the ambient temperature sensor 61 is sampled again and directly heated according to it.

[0373] In some other embodiments of the present application, the first rotational speed is lower than the rotational speed corresponding to the low wind speed gear of the crossflow blower.

[0374] In this embodiment, the first speed is set to be lower than the speed corresponding to the low wind speed gear of the crossflow fan, that is, the first speed does not exist in the user-controllable gear of the crossflow fan. The lower first speed can effectively prevent the excessive wind speed in step S18 from affecting the indoor temperature and user comfort.

[0375] In some other embodiments of the present application, the first speed n is: n>10 rpm; n≤100 rpm.

[0376] The first speed n cannot be too small. If it is too small, the air flow around the indoor unit cannot be effectively driven, and the accuracy of the indoor ambient temperature detection before the heating is started cannot be ensured. In order to ensure the accuracy of the indoor ambient temperature detection when the target indoor unit is started, the first speed n is set to be greater than the seventh parameter value. For example, the seventh parameter value can be 10rpm, 13rpm, or 15rpm. Consider selecting a suitable and specific parameter in the specific design.

[0377] The first speed n cannot be too large, otherwise it will lead to excessive wind speed, which will lead to low air outlet temperature and affect the comfort of users. In order to ensure the comfort of users, the first speed n is set to be no greater than the eighth parameter value. For example, the eighth parameter value can be 100rpm, 95rpm, or 90rpm. Consider selecting a suitable and specific parameter in the specific design.

[0378] In some other embodiments of the present application, the first rotation speed n is: 10 rpm<n≤100 rpm.

[0379] In this embodiment, setting the first rotation speed n within a reasonable range can not only effectively drive the ambient air flow of the indoor unit and ensure the accuracy of indoor ambient temperature detection before heating is started, but also ensure user comfort and improve user experience.

[0380] In some other embodiments of the present application, the preset time may be no less than 1 minute.

[0381] The multi-split air conditioning system provided in this embodiment moves the air guide plate to the open position and controls the cross-flow fan to operate at a speed of 10 rpm for test. After 1 minute, the error between the indoor ambient temperature detected by the ambient temperature sensor 61 and the actual indoor ambient temperature is within 1°C.

[0382] In some other embodiments of the present application, the air guide plate in the open position guides the air flow blown out of the air conditioner outlet upward. That is, when the air guide plate is in the open position, the air conditioner outlet blows air upward.

[0383] In this embodiment, the air guide plate is moved to the open position so that the air outlet of the air conditioner in step S17 blows air upward to prevent cold wind from blowing directly on people, thereby improving user comfort.

[0384] Among them, when the first rotational speed is in the lower rotational speed range mentioned above, the lower first rotational speed makes the wind speed lower. In this case, the air outlet temperature will not be very low, and the air is guided upward through the air guide plate to further improve the user comfort.

[0385] In some embodiments of the present application, the controller is further configured to: if the target indoor unit does not have an air guide plate, determine that the target indoor unit meets a preset compensation condition.

[0386] refer to Fig.43 After executing step S15, if no, that is, the target indoor unit does not have an air guide plate, it is determined that the target indoor unit meets the preset compensation condition, and steps S2, S3 and S4 are executed in sequence.

[0387] Specifically, when the target indoor unit's air outlet is not provided with an air guide plate, turning on the crossflow fan will reduce the outlet air temperature, thereby reducing the user's comfort. Therefore, when the target indoor unit's air outlet is not provided with an air guide plate, the technical means of turning on the crossflow fan to drive the air flow around the indoor unit cannot be used to reduce the interference of heat radiation on the detection of the ambient temperature sensor 61.

[0388] In this embodiment, when the target indoor unit does not have an air guide plate, the indoor ambient temperature is temperature compensated according to the operating state of the outdoor unit and the temperature of the inner coil, so that the error between the compensated indoor ambient temperature and the actual indoor ambient temperature is small, ensuring the accuracy of the indoor ambient temperature detection before the target indoor unit starts heating. After the indoor ambient temperature is temperature compensated, the compensated indoor ambient temperature is brought into the air conditioning system for direct heating operation, ensuring that the indoor unit starts in time and the user's comfort is guaranteed.

[0389] In some other embodiments of the present application, the first logic setting is: T1 = d*Tin / F+e, wherein d and e are correction coefficients, Tin is the sampled inner coil temperature, F is the operating frequency of the compressor 201, and T1 is the temperature compensation value.

[0390] Specifically, the temperature compensation value T1 needs to be calculated based on the operating frequency F of the compressor 201 and the inner coil temperature Tin at this time. d and e are correction coefficients, and d and e can be constants. The higher the operating frequency of the compressor 201, the higher the inner coil temperature, and the ratio of the two (Tin / F) will be affected by the actual indoor ambient temperature.

[0391] If the actual indoor ambient temperature is low, the ratio is low, and vice versa. Wherein, d is a negative value and e is a positive value. When the detected indoor ambient temperature is low, the calculated ratio (Tin / F) is low, and the temperature compensation value T1 obtained according to the first logical operation will increase. The controller obtains the corrected indoor ambient temperature, i.e., the compensated indoor ambient temperature, and brings the corrected compensated indoor ambient temperature into the air conditioning system to start heating operation. Compensated indoor ambient temperature = indoor ambient temperature detected by the ambient temperature sensor 61 - temperature compensation value T1.

[0392] In some embodiments, the temperature compensation value T1 may be any value between 2°C and 10°C.

[0393] The multi-split air conditioning system provided by the present invention has a simple structure, is easy to operate, does not require additional hardware, saves costs, and can ensure the accuracy of indoor ambient temperature detection before the multi-split unit starts heating under various conditions, so that the detection of indoor ambient temperature more accurately reflects the actual indoor ambient temperature, ensures that the indoor unit starts in time, and ensures user comfort. The multi-split air conditioning system provided by the present invention is more suitable for indoor ambient temperature detection when a duct unit or an indoor unit with a small space is used as a multi-split unit.

[0394] In addition, the embodiments of the present application provide hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily appreciate that, in conjunction with the modules and algorithm steps of each example described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0395] The embodiment of the present application can divide the controller into functional modules according to the above step examples. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. Optionally, the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0396] The different locations of the environment temperature sensor 61 result in different degrees of influence of the heat radiation on the environment temperature sensor 61. The farther the environment temperature sensor 61 is from the indoor heat exchanger 21, the less heat radiation it receives.

[0397] In some other embodiments of the present application, considering the detection of the indoor ambient temperature when the crossflow fan rotates, to ensure good tracking of the indoor ambient temperature when the crossflow fan is running, the ambient temperature sensor 61 can be set on one of the two side surfaces of the end plate or on the rear panel through the sensor bracket 62. The specific arrangement of the ambient temperature sensor 61 is as described in the above embodiment, and will not be described in detail here.

[0398] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

[0399] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A duct machine, characterized in that: include: The machine body has an air-conditioning air inlet and an air-conditioning air outlet at both ends in the width direction, and the machine body includes a top plate and a bottom plate arranged opposite to each other in the vertical direction; An indoor heat exchanger is disposed in the machine body and close to the air inlet of the air conditioner; A cross-flow fan is disposed in the machine body and between the indoor heat exchanger and the air outlet of the air conditioner. Under the action of the cross-flow fan, indoor air enters the machine body through the air inlet of the air conditioner, and is output to the room through the air outlet of the air conditioner after heat exchange through the indoor heat exchanger; The indoor heat exchanger is a three-fold heat exchanger, and the indoor heat exchanger includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are connected to form a plurality of refrigerant flow paths; Two end plates are respectively connected to the two ends of the indoor heat exchanger in the length direction, and the distance between the two end plates is not less than 1000 mm; In the cooling mode, the refrigerant flow path has an inlet and two outlets, so that the refrigerant enters the corresponding refrigerant flow path through the inlet and flows out of the refrigerant flow path through the two outlets.

2. A duct machine, characterized in that: include: The machine body has an air-conditioning air inlet and an air-conditioning air outlet at both ends in the width direction, and the machine body includes a top plate and a bottom plate arranged opposite to each other in the vertical direction; An indoor heat exchanger is disposed in the machine body and close to the air inlet of the air conditioner; A cross-flow fan is disposed in the machine body and between the indoor heat exchanger and the air outlet of the air conditioner. Under the action of the cross-flow fan, indoor air enters the machine body through the air inlet of the air conditioner, and is output to the room through the air outlet of the air conditioner after heat exchange through the indoor heat exchanger; The indoor heat exchanger is a three-fold heat exchanger, and the indoor heat exchanger includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are connected to form a plurality of refrigerant flow paths, and a refrigerant flow path relatively close to the bottom plate among the plurality of refrigerant flow paths is defined as a first refrigerant flow path, and the first refrigerant flow path is located at the bottom of the indoor heat exchanger; In the cooling mode, the first refrigerant flow path has an inlet and an outlet, and at least part of the other refrigerant flow paths has an inlet and two outlets.

3. The air duct machine according to claim 1 or 2, characterized in that: The indoor heat exchanger includes a first section heat exchanger, a second section heat exchanger and a third section heat exchanger. The first section heat exchanger, the second section heat exchanger and the third section heat exchanger are sequentially connected from bottom to top to form a half-enclosed structure. The half-enclosed structure has an opening toward the cross-flow fan to surround part of the cross-flow fan.

4. The air duct machine according to claim 3, characterized in that: The first section heat exchanger and the second section heat exchanger are completely cut apart at the connecting portion thereof, and the first section heat exchanger and the second section heat exchanger are plugged and arranged at a first preset angle.

5. The air duct machine according to claim 3, characterized in that: The first refrigerant flow path close to the bottom plate and the inlet and outlet of the first refrigerant flow path are arranged on the first section heat exchanger, and an acute angle is formed between the first section heat exchanger and the horizontal plane where the free end is located, with the opening facing the air inlet of the air conditioner.

6. The air duct machine according to claim 3, characterized in that: The first section heat exchanger and the second section heat exchanger are an integrated structure, and a bending angle is formed at a connection between the first section heat exchanger and the second section heat exchanger by special-shaped cutting.

7. The air duct machine according to claim 3, characterized in that: The first-stage heat exchanger, the second-stage heat exchanger and the third-stage heat exchanger are provided with double rows of heat exchange tubes.

8. The air duct machine according to claim 1 or 2, characterized in that: The heat exchange tube is an internally threaded tube, and the inner diameter of the internally threaded tube does not exceed 5 mm.

9. The air duct machine according to claim 8, characterized in that: The number of the refrigerant flow paths is at least six; and / or each of the refrigerant flow paths includes the same number of the heat exchange tubes, and each of the heat exchange tubes has the same length.

10. The air duct machine according to claim 1 or 2, characterized in that: The refrigerant flow path having one inlet and two outlets is defined as the second refrigerant flow path, the heat exchange tube is a U-shaped tube, and the second refrigerant flow path includes a plurality of heat exchange tubes; in the cooling mode, the refrigerant entering the second refrigerant flow path from the inlet passes through at least one of the heat exchange tubes and is split by the claw-type three-way tube to form two refrigerant paths, which flow out of the second refrigerant flow path from the two outlets respectively.

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