Multi-split air conditioning system

Abstract

The present invention discloses a multi-split air-conditioning system, which comprises: an outdoor unit; a plurality of indoor units connected in parallel and connected to the outdoor unit; when the multi-split air-conditioning system is heating, the indoor unit that is not turned on is defined as the target indoor unit; the indoor unit comprises: an indoor heat exchanger; an ambient temperature sensor for detecting the indoor ambient temperature to provide a base for subsequent temperature compensation; a coil temperature detection device for detecting the internal coil temperature; a controller, which is configured to: after the target indoor unit receives a heating instruction, determine whether the target indoor unit meets a preset compensation condition; if so, derive a temperature compensation value through a first logical operation according to the operating frequency of the compressor and the internal coil temperature of the target indoor unit; 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 a heating operation mode accordingly, to ensure that the indoor unit is started in time and user comfort is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a multi-connected air conditioning system. Background Art

[0002] With the popularity of air conditioners, more and more users choose to install central air conditioners in their homes. As a type of central air conditioner, duct air conditioners are popular among users for their low cost, simple structure, and hidden installation. Existing duct air conditioners can usually be installed in a suspended ceiling (which can be a suspended ceiling in front of curtains). An ambient temperature sensor is installed inside the duct air conditioner to detect the indoor ambient temperature and implement various control actions of the air conditioner based on the indoor ambient temperature. The location of the ambient temperature sensor is particularly important. If the location of the ambient temperature sensor is not set properly, it is very easy for the ambient temperature sensor to be affected by condensed water, indoor heat exchanger, refrigerant temperature, etc., which can easily lead to abnormal shutdown, abnormal startup, and other problems, affecting the normal use of users.

[0003] Ducted air conditioners can be used as indoor units in multi-split air conditioning systems. Multi-split air conditioners have multiple indoor units, each located in a different room. When the multi-split system is operating in heating mode and only some of the indoor units are powered on, the refrigerant will continue to circulate through the indoor heat exchangers of the indoor units, even though the crossflow fans of the non-powered indoor units are not running. Due to the narrow depth of the ducted air conditioner, heat accumulates in the indoor units, causing the indoor ambient temperature detection point to be affected by thermal radiation. This causes the ambient temperature sensor to detect an excessively high temperature, which in turn affects the accuracy of the indoor ambient temperature detection and leads to an erroneous judgment of the indoor ambient temperature. When the indoor unit is activated for heating mode, it cannot be started.

[0004] To ensure the accuracy of indoor temperature detection before a multi-split system starts heating, temperature compensation is typically performed on the detected indoor temperature. Related technologies typically use a fixed value based on cooling or heating operation, or perform temperature compensation based on the indoor temperature and the internal coil temperature. This cannot guarantee the accuracy of ambient temperature detection before the multi-split system starts heating under various conditions.

[0005] In view of this, how to reasonably set the position of the ambient temperature sensor to weaken the interference of the thermal radiation of the indoor heat exchanger on the detection value of the ambient temperature sensor, how to reasonably configure the controller to ensure the accuracy of indoor ambient temperature detection before the multi-split system starts heating under various conditions, ensure timely startup, and ensure user comfort are technical problems that technical personnel in this field need to solve. Summary of the Invention

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] The present invention provides a multi-split air conditioning system, comprising:

[0008] an outdoor unit including a compressor;

[0009] A plurality of indoor units connected in parallel are connected to the outdoor unit; wherein, when the multi-split air-conditioning system is heating, some of the plurality of indoor units are in a heating operation mode, and the other indoor units that are not turned on are defined as target indoor units;

[0010] The indoor unit includes:

[0011] A machine body, wherein the machine body is provided with an air-conditioning air inlet and an air-conditioning air outlet;

[0012] An indoor heat exchanger is disposed in the machine body and close to the air inlet of the air conditioner;

[0013] a cross-flow fan disposed within the housing and between the indoor heat exchanger and the air-conditioning outlet, wherein indoor air enters the housing through the air-conditioning inlet under the action of the cross-flow fan, exchanges heat in the indoor heat exchanger, and is output to the room through the air-conditioning outlet;

[0014] Ambient temperature sensor, used to detect indoor ambient temperature to provide a base for subsequent temperature compensation;

[0015] A coil temperature detection device is provided on the indoor heat exchanger to detect the temperature of the inner coil;

[0016] A controller is electrically connected to the outdoor unit and the indoor unit, and is configured to:

[0017] After the target indoor unit receives the heating instruction, determining whether the target indoor unit meets a preset compensation condition;

[0018] If yes, then obtaining a temperature compensation value through a first logical operation according to the operating frequency of the compressor and the internal coil temperature of the target indoor unit;

[0019] The indoor ambient temperature is compensated according to the temperature compensation value to obtain a compensated indoor ambient temperature, and the target indoor unit is controlled to enter a heating operation mode according to the compensated indoor ambient temperature.

[0020] The multi-split air-conditioning system provided by the present technical solution obtains a temperature compensation value through a first logical operation according to the operating frequency of the compressor and the internal coil temperature of the target indoor unit, that is, the indoor ambient temperature is temperature compensated according to the operating status of the outdoor unit and the internal coil temperature, so that the temperature compensation value is more accurate than the existing technology, ensuring the accuracy of the detection of the indoor ambient temperature before the multi-split unit starts heating under the preset compensation conditions, ensuring the timely start-up of the indoor unit, and ensuring the comfort of the user.

[0021] The present invention also provides a multi-split air conditioning system, comprising:

[0022] an outdoor unit including a compressor;

[0023] A plurality of indoor units connected in parallel are connected to the outdoor unit; wherein, when the multi-split air-conditioning system is heating, some of the plurality of indoor units are in a heating operation mode, and the other indoor units that are not turned on are defined as target indoor units;

[0024] The indoor unit comprises:

[0025] A housing having an accommodating cavity formed therein, the housing comprising a rear panel and a front panel disposed opposite to each other along its width direction, the rear panel and the front panel respectively being provided with an air-conditioning inlet and an air-conditioning outlet communicating with the accommodating cavity;

[0026] An indoor heat exchanger is arranged in the accommodating cavity and close to the air inlet of the air conditioner;

[0027] a cross-flow fan disposed in the accommodating cavity and between the indoor heat exchanger and the air-conditioning outlet; under the action of the cross-flow fan, indoor air enters the accommodating cavity through the air-conditioning inlet, and is output to the room through the air-conditioning outlet after being heated by the indoor heat exchanger;

[0028] an end plate, located in the accommodating cavity and connected to one end of the indoor heat exchanger in the longitudinal direction;

[0029] An ambient temperature sensor is provided on the end plate or on the side of the rear panel away from the accommodating cavity, for detecting the indoor ambient temperature to provide a basis for subsequent temperature compensation;

[0030] A coil temperature detection device is provided on the indoor heat exchanger to detect the temperature of the inner coil;

[0031] A controller is electrically connected to the outdoor unit and the indoor unit, and is configured to:

[0032] After the target indoor unit receives the heating instruction, determining whether the target indoor unit meets a preset compensation condition;

[0033] If yes, then obtaining a temperature compensation value through a first logical operation according to the operating frequency of the compressor and the internal coil temperature of the target indoor unit;

[0034] The indoor ambient temperature is compensated according to the temperature compensation value to obtain a compensated indoor ambient temperature, and the target indoor unit is controlled to enter a heating operation mode according to the compensated indoor ambient temperature.

[0035] The multi-split air conditioning system provided by this technical solution rationally positions the ambient temperature sensor, placing it at a distance from the indoor heat exchanger and free from obstruction by objects. This reduces the impact of the indoor heat exchanger on the indoor ambient temperature detected by the ambient temperature sensor and minimizes the temperature difference between the detected and actual indoor ambient temperature. Before heating is activated, if preset compensation conditions are met, the indoor ambient temperature is compensated based on the operating status of the outdoor unit and the temperature of the internal coil. This makes the temperature compensation value more accurate than that of existing technologies, ensuring the accuracy of indoor ambient temperature detection before the multi-split system starts heating when the preset compensation conditions are met, ensuring timely startup of the indoor unit, and ensuring user comfort.

[0036] In some embodiments, the controller is further configured to:

[0037] After the target indoor unit receives the heating instruction, determining whether the target indoor unit includes an electronic expansion valve;

[0038] If yes, then obtain the working state of the electronic expansion valve, wherein the working state includes closed state and open state;

[0039] If the electronic expansion valve is in a closed state, the target indoor unit is controlled to directly enter a heating operation mode according to the current indoor ambient temperature.

[0040] In this technical solution, when the target indoor unit includes an electronic expansion valve and it remains closed in standby mode, the refrigerant does not flow through the indoor heat exchanger. At this time, the indoor ambient temperature detected by the ambient temperature sensor is the actual indoor ambient temperature, and heating operation can be performed directly according to the detected indoor ambient temperature.

[0041] In some embodiments, 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:

[0042] Determining whether the temperature of the inner coil reaches or exceeds a preset temperature;

[0043] If not, control sampling the current indoor ambient temperature, and control the target indoor unit to enter a heating operation mode according to the sampled indoor ambient temperature;

[0044] If so, determine whether there is an air guide plate at the air-conditioning outlet of the target indoor unit.

[0045] In this technical solution, when the electronic expansion valve is not detected or is in the open state, if the internal coil temperature is lower than the preset temperature, the compressor of the outdoor unit is not running or is running at a low frequency, and the influence of heat radiation on the ambient temperature sensor is small. At this time, the detected indoor ambient temperature is still considered to be the actual indoor ambient temperature, and direct heating operation can be performed based on this.

[0046] In some embodiments, the controller is further configured to:

[0047] If the target indoor unit has the air deflector, controlling the air deflector to move to an open position;

[0048] The cross-flow fan is controlled to operate at a first speed, and after a preset time, the current indoor ambient temperature is sampled, and the target indoor unit is controlled to enter a heating operation mode according to the sampled indoor ambient temperature.

[0049] In this technical solution, 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 a first speed for a preset time, thereby accelerating the heat dissipation of the target indoor unit and reducing the ambient temperature around the target indoor unit, so as to weaken the interference of the thermal radiation of the indoor heat exchanger on the detection value of the ambient temperature sensor, so that the error between the detection value and the actual value of the indoor ambient temperature can be ignored. At this time, the indoor ambient temperature is sampled again and direct heating operation is carried out based on it.

[0050] In some embodiments, the first rotational speed is lower than the rotational speed corresponding to the low wind speed gear of the cross-flow fan, and / or the air guide plate in the open position guides the air flow blown out of the air-conditioning outlet upward.

[0051] In this technical solution, the first speed is lower than the speed corresponding to the low wind speed gear of the cross-flow fan. The lower first speed is used to avoid excessive wind speed affecting the indoor temperature and user comfort; the wind guide plate guides the air upward to prevent direct blowing and further improve user comfort.

[0052] In some embodiments, the controller is further configured to: if the target indoor unit does not have the air guide plate, determine that the target indoor unit meets a preset compensation condition.

[0053] In some embodiments, the controller is configured to:

[0054] If 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, controlling and sampling the current temperature of the inner coil;

[0055] If the sampled inner coil temperature reaches or exceeds a preset temperature, and the air-conditioning outlet of the target indoor unit is not provided with an air guide plate, it is determined that the preset compensation condition is met.

[0056] In some embodiments, the first logic setting is: T1 = d*Tin / F+e;

[0057] Wherein, d and e are correction coefficients, Tin is the sampled inner coil temperature, F is the operating frequency of the compressor, and T1 is the temperature compensation value.

[0058] In some embodiments, the indoor unit further includes a sensor bracket, which forms a mounting portion for embedding the ambient temperature sensor, and the sensor bracket is fixed to the end plate or the rear panel; the sensor bracket is used to clamp and fix the ambient temperature sensor without the need for wire ties, and the structure is simple and the assembly is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a structural block diagram of an embodiment of a multi-split air conditioning system of the present invention;

[0060] Figure 2 is a flow chart of the temperature compensation steps in one embodiment of the multi-split air conditioning system of the present invention;

[0061] Figure 3 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 present invention is as follows;

[0062] Figure 4 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 present invention is provided;

[0063] Figure 5 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 present invention.

[0064] Figure 6 This is a structural diagram of a ducted air conditioner in one embodiment of a multi-split air conditioning system of the present invention;

[0065] Figure 7 This is a structural diagram of a duct unit from another perspective of an embodiment of a multi-split air conditioning system of the present invention;

[0066] Figure 8 It is a front view of a ducted air conditioner in one embodiment of a multi-split air conditioning system of the present invention;

[0067] Figure 9 yes Figure 8 Cross-sectional view in the AA direction;

[0068] Figure 10 2 is a schematic structural diagram of a heat exchanger assembly in one embodiment of a multi-split air conditioning system of the present invention;

[0069] Figure 11 is an exploded view of a fan assembly in one embodiment of a multi-split air conditioning system of the present invention;

[0070] Figure 12 1 is a structural diagram of a multi-split air conditioning system according to another embodiment of the present invention;

[0071] Figure 13 This is a schematic structural diagram of an embodiment of a multi-split air conditioning system of the present invention in which an air inlet filter assembly is omitted;

[0072] Figure 14 yes Figure 12 A partial enlarged view of point A in the middle;

[0073] Figure 15 yes Figure 13 A partial enlarged view of point C in the middle;

[0074] Figure 16 is a structural schematic diagram of a heat exchanger assembly in one embodiment of a multi-split air conditioning system according to the present invention from another perspective;

[0075] Figure 17 It is a partial structural diagram of the end plate and the temperature detection assembly in one embodiment of the multi-split air conditioning system of the present invention;

[0076] Figure 18 1. It is a schematic diagram of the installation of a temperature detection component in an embodiment of a multi-split air conditioning system of the present invention;

[0077] Figure 19 is a perspective view of an embodiment of a multi-split air conditioning system of the present invention;

[0078] Figure 20 yes Figure 19 A partial enlarged view of point B in the middle;

[0079] Figure 21 is a cross-sectional view of a heat exchanger assembly in one embodiment of a multi-split air conditioning system of the present invention;

[0080] Figure 22 This is a partial structural diagram of an embodiment of a multi-split air conditioning system of the present invention, in which the first side panel is omitted;

[0081] Figure 23 1. It is a schematic diagram of the installation of a temperature detection component in an embodiment of a multi-split air conditioning system of the present invention;

[0082] Figure 24 This is a schematic diagram of the structure of the indoor heat exchanger in one embodiment of the multi-split air conditioning system of the present invention. Figure 1 ;

[0083] Figure 25This is a schematic diagram of the structure of the indoor heat exchanger in one embodiment of the multi-split air conditioning system of the present invention. Figure 2 ;

[0084] Figure 26 1 is a schematic diagram showing the connection between the indoor heat exchanger and the inlet and outlet pipe assemblies in one embodiment of the multi-split air conditioning system of the present invention;

[0085] Figure 27 Schematic diagram of the even distribution of refrigerant flow paths inside the indoor heat exchanger in one embodiment of the multi-split air conditioning system of the present invention Figure 1 ;

[0086] Figure 28 2. It is a schematic structural diagram of a heat exchange tube in an embodiment of a multi-split air conditioning system of the present invention;

[0087] Figure 29 1 is a partial structural diagram of a heat exchanger assembly in one embodiment of a multi-split air conditioning system of the present invention;

[0088] Figure 30 This is a schematic diagram of the connection between the first and second heat exchangers in one embodiment of the multi-split air conditioning system of the present invention. Figure 1 ;

[0089] Figure 31 This is a schematic diagram of the connection between the first and second heat exchangers in one embodiment of the multi-split air conditioning system of the present invention. Figure 2 ;

[0090] Figure 32 Schematic diagram of the even distribution of refrigerant flow paths inside the indoor heat exchanger in one embodiment of the multi-split air conditioning system of the present invention Figure 2 ;

[0091] Figure 33 Schematic diagram of unevenly divided refrigerant flow paths within an indoor heat exchanger in one embodiment of a multi-split air conditioning system of the present invention;

[0092] Figure 34 This is a schematic diagram of the split flow treatment of the refrigerant flow path inside the indoor heat exchanger in one embodiment of the multi-split air conditioning system of the present invention. Figure 1 ;

[0093] Figure 35 This is a schematic diagram of the split flow treatment of the refrigerant flow path inside the indoor heat exchanger in one embodiment of the multi-split air conditioning system of the present invention. Figure 2 ;

[0094] Figure 36 is a cross-sectional view of an embodiment of a multi-split air conditioning system of the present invention;

[0095] Figure 37 This is a schematic diagram of an embodiment of the multi-split air conditioning system of the present invention in which the first refrigerant flow path does not adopt a split flow treatment. Figure 1 ;

[0096] Figure 38 This is a schematic diagram of an embodiment of the multi-split air conditioning system of the present invention in which the first refrigerant flow path does not adopt a split flow treatment. Figure 2 ;

[0097] Figure 39 is a cross-sectional view of a duct unit of another embodiment of a multi-split air conditioning system of the present invention;

[0098] Figure 40 This is a cross-sectional view of a duct unit of another embodiment of the multi-split air conditioning system of the present invention;

[0099] Figure 41 This is a schematic diagram of the internal structure of a duct unit in one embodiment of a multi-split air conditioning system of the present invention;

[0100] Figure 42 2. It is a schematic structural diagram of an embodiment of a multi-split air conditioning system of the present invention in which the indoor heat exchanger is a two-fold heat exchanger;

[0101] Figure 43 This is a schematic structural diagram of a solenoid valve provided at the inlet of the first refrigerant flow path in one embodiment of a multi-split air conditioning system of the present invention;

[0102] In the above figures: indoor unit 100; outdoor unit 200; compressor 201; outdoor heat exchanger 202; controller 300; 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 Flow path 2152; heat exchange tube 216; straight tube 2161; elbow 2162; connecting tube 217; first end plate 22; second end plate 23; fan assembly 3; cross-flow fan 31; drive motor 32; base 38; electric auxiliary heating assembly 4; water collecting 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; wire threading hole 66; electrical box 72; inlet pipe assembly 8; shunt pipe 81; blind pipe 82; inlet straight pipe 83; diverter 84; inlet pipe 85; solenoid valve 9; outlet pipe assembly 11. DETAILED DESCRIPTION

[0103] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0104] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments, unless there is a conflict.

[0105] 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 the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0106] 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.

[0107] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0108] The multi-split air conditioning system provided in the embodiment of the present invention can have various implementation forms.

[0109] This application also provides a multi-split air conditioning system. Figures 1 to 43 In an exemplary embodiment of the multi-split air-conditioning system of the present application, the multi-split air-conditioning system may include an outdoor unit.

[0110] The outdoor unit is usually arranged outdoors and is used to bring indoor heat to the outdoors. The outdoor unit may include an outdoor heat exchanger.

[0111] The outdoor unit may include a compressor that compresses low-temperature, low-pressure refrigerant gas and discharges high-temperature, high-pressure refrigerant gas, which flows into the condenser.

[0112] A multi-split air conditioning system may include an indoor unit, which is usually installed indoors to exchange heat with the indoor environment.

[0113] refer to Figure 1 The indoor unit consists of multiple indoor units connected in parallel. These units are connected to an outdoor unit. These units are located in different rooms and can be wall-mounted, duct-mounted, curtain-mounted, or other types.

[0114] The multi-split air conditioning system may include a controller that is electrically connected to the indoor unit and the outdoor unit to control the operation of various components therein, so that each component of the multi-split air conditioning system operates to achieve various predetermined functions of the multi-split air conditioning system.

[0115] In the embodiment shown in this application, controller 3 is a device that generates an operational control signal based on a command opcode and a timing signal, thereby instructing the air conditioner to execute the control command. For example, in response to a power-on or power-off command received from a user, controller 3 may execute an operation related to the object selected by the power-on or power-off command.

[0116] For example, the controller may be a central processing unit (CPU), a general-purpose processor, a 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.

[0117] The indoor unit includes a body 10. The body 10 defines a receiving chamber 101 therein. The receiving chamber 101 is used to accommodate and secure various components of the indoor unit, thereby preventing foreign objects from colliding with the various components within the body 10 and improving the reliability of the indoor unit during transportation or installation.

[0118] The housing 10 may include an air inlet 102 . The air inlet 102 is in communication with the accommodating chamber 101 . The air inlet 102 serves as an inlet for external air to flow into the housing 10 , allowing indoor air to enter the accommodating chamber 101 through the air inlet 102 .

[0119] The 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 air flow in the body 10 , allowing the air flow in the accommodating chamber 101 to flow out through the air conditioning outlet 103 .

[0120] The indoor unit may include a heat exchanger assembly. The heat exchanger assembly is arranged in the accommodating cavity.

[0121] The heat exchanger assembly may include an indoor heat exchanger, wherein the indoor heat exchanger 21 is used to perform heat exchange with the air entering the body 10. The plurality of indoor heat exchangers are respectively connected to the outdoor heat exchanger through multiple refrigerant pipes.

[0122] The indoor unit may include a fan assembly 3. The fan assembly 3 is disposed in the accommodating chamber 101. The fan assembly 3 may include a cross-flow fan.

[0123] The cross-flow fan may include a cross-flow fan 31 located between the indoor heat exchanger 21 and the air-conditioning outlet 103 . Under the action of the cross-flow fan 31 , indoor air outside the housing 10 enters the accommodating chamber 101 through the air-conditioning inlet 102 , and the air in the accommodating chamber 101 can flow along the air-conditioning inlet 102 toward the air-conditioning outlet 103 .

[0124] When the indoor unit is running, under the action of the cross-flow fan, the indoor air enters the accommodating chamber 101 through the air-conditioning inlet 102, and the indoor air in the accommodating chamber 101 flows through the indoor heat exchanger 21 for heat exchange. The heat exchanged air flows into the room through the air-conditioning 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.

[0125] The cross-flow fan may include a drive motor 32. The drive 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.

[0126] In this embodiment, due to the characteristics of the cross-flow fan, the cross-flow fan is disposed close to the air outlet 103 of the air conditioner, and the indoor heat exchanger 21 is disposed close to the air inlet 102 of the air conditioner.

[0127] That is to say, the cross-flow fan is located between the air-conditioning outlet 103 and the indoor heat exchanger 21. The cross-flow fan rotates to introduce indoor air into the body 10 from the air-conditioning inlet 102. After heat exchange in the indoor heat exchanger 21, air-conditioned air is formed and sent out from the air-conditioning outlet 103.

[0128] The indoor unit includes an electric control assembly, which may include an electric control board, which is electrically connected to electrical components inside the unit body 10 via electric control lines.

[0129] It can be understood that the electronic control board is configured to be electrically connected to the above-mentioned compressor, expansion valve and cross-flow fan through at least electronic control to control at least the compressor, expansion valve and cross-flow fan, thereby controlling the operation of the entire indoor unit and realizing the various predetermined functions of the air conditioner.

[0130] The electric control board can transmit signals to the wire controller or remote controller via a communication line. The wire controller or 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 air conditioning system.

[0131] The indoor unit may include a temperature detection component 6. The temperature detection component 6 may include an ambient temperature sensor 61 for detecting the indoor ambient temperature to provide a basis for subsequent temperature compensation.

[0132] 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 for subsequent control.

[0133] The indoor unit may include a coil temperature detection device. The coil temperature detection device is provided on the indoor heat exchanger to detect the coil temperature of the indoor heat exchanger. The coil temperature of the indoor heat exchanger is defined as the inner coil temperature.

[0134] The coil temperature detection devices are all connected to the controller to transmit data information to the controller. The coil temperature detection devices detect the internal coil temperature in real time and transmit the electrical signal to the controller for subsequent control.

[0135] 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, and the temperature of one of the coils in the middle of the coil temperature detection device is determined as the coil temperature of the indoor heat exchanger.

[0136] When a multi-split air conditioning system is heating, some of the multiple indoor units are in heating mode, while others are inactive. Although the crossflow fans in the inactive indoor units are not running, hot refrigerant still circulates through the indoor heat exchangers, causing heat exchange between the indoor heat exchangers and the surrounding air, resulting in localized changes in air temperature. This in turn affects the accuracy of the indoor ambient temperature detected by the ambient temperature sensor 61, leading to an erroneous indoor temperature reading. When the indoor units are in operation, they cannot be started.

[0137] To solve the above technical problems, when the multi-split air conditioning system is heating, the other indoor units that are not turned on are defined as target indoor units, and the controller is configured as follows:

[0138] After the target indoor unit receives the heating command, it is determined whether the target indoor unit meets the preset compensation condition;

[0139] If yes, then a temperature compensation value is obtained through a first logical operation according to the operating frequency of the compressor and the internal coil temperature of the target indoor unit;

[0140] The indoor ambient temperature is compensated according to the temperature compensation value to obtain a compensated indoor ambient temperature, and the target indoor unit is controlled to enter a heating operation mode according to the compensated indoor ambient temperature.

[0141] Specifically, the controller may be configured to execute the steps of correcting and compensating the indoor ambient temperature after the target indoor unit receives the heating instruction, including:

[0142] refer to Figure 2 , determining whether the target indoor unit meets the preset compensation condition (step S1);

[0143] After executing step S1, if yes, that is, whether the target indoor unit meets the preset compensation condition, step S2 is executed: a temperature compensation value is obtained by a first logical operation according to the operating frequency of the compressor and the internal coil temperature of the target indoor unit;

[0144] After executing step S2, step S3 is executed: compensating the indoor ambient temperature according to the temperature compensation value to obtain the compensated indoor ambient temperature, and controlling the target indoor unit to enter the heating operation mode according to the compensated indoor ambient temperature (step S4).

[0145] The multi-split air conditioning system provided in this embodiment uses a first logical operation to determine a temperature compensation value based on the compressor operating frequency and the target indoor unit's internal coil temperature. This compensates the indoor ambient temperature based on the outdoor unit's operating status and the internal coil temperature. This makes the temperature compensation value more accurate than in existing technologies, ensuring a smaller error between the compensated indoor ambient temperature and the actual indoor ambient temperature. This ensures accurate indoor ambient temperature detection before the multi-split system starts heating when preset compensation conditions are met. After temperature compensation, the compensated indoor ambient temperature is incorporated into the air conditioning system for direct heating operation, ensuring timely startup of the indoor units and user comfort.

[0146] It's important to note that in multi-split air conditioning systems, configurations vary by region, with some systems featuring an electronic expansion valve inside the indoor unit. Accordingly, indoor units equipped with electronic expansion valves can control the flow of refrigerant by adjusting the opening of the valve.

[0147] 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 the indoor unit has an electronic expansion valve and whether refrigerant flows through the indoor heat exchanger of the target indoor unit.

[0148] Furthermore, the controller is configured to:

[0149] After the target indoor unit receives the heating instruction, determining whether the target indoor unit includes an electronic expansion valve;

[0150] If yes, then obtain the working state of the electronic expansion valve, wherein the working state includes closed state and open state;

[0151] 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.

[0152] Specifically, refer to Figure 3 , after the target indoor unit receives the heating command, the controller is configured as follows:

[0153] Execute step S11: determine whether the target indoor unit includes an electronic expansion valve.

[0154] After executing step S11, if yes, that is, the target indoor unit includes an electronic expansion valve, executing step S12: obtaining the working status of the electronic expansion valve and determining whether the electronic expansion valve is in a closed state (step S13);

[0155] After executing step S13, if yes, that is, the electronic expansion valve is in the closed state, then execute step S14: control the 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).

[0156] 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 can control the opening of the electronic expansion valve according to actual demand to control the flow of refrigerant. It is understandable that the controller can directly detect whether the indoor unit has an electronic expansion valve.

[0157] In this embodiment, if the target indoor unit is determined to include an electronic expansion valve and the valve remains closed in the standby mode, this indicates that refrigerant is not flowing through the indoor heat exchanger. In this case, the indoor ambient temperature detected by the ambient temperature sensor 61 is the actual indoor ambient temperature. The controller uses the indoor ambient temperature detected by the ambient temperature sensor 61 to directly enter heating operation in the air conditioning system, ensuring timely startup of the target indoor unit.

[0158] 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:

[0159] Determine whether the temperature of the inner coil reaches above the preset temperature;

[0160] If not, 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;

[0161] If so, it is determined whether there is an air guide plate at the air outlet of the target indoor unit.

[0162] Specifically, refer to Figure 4 , the controller is configured as:

[0163] After executing step S11, if no, that is, the target indoor unit does not include an electronic expansion valve, execute step S15: determine whether the temperature of the internal coil reaches or exceeds the preset temperature; or,

[0164] After executing step S13, if no, that is, the electronic expansion valve is in the open state, step S15 is executed: determining whether the temperature of the inner coil reaches or exceeds the preset temperature.

[0165] 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.

[0166] After executing step S15, if the indoor coil temperature is lower than the preset temperature, then steps S14 and S5 are executed again to sample the current indoor ambient temperature and control the target indoor unit to enter heating mode based on the sampled indoor ambient temperature. If the indoor coil temperature is higher than or equal to the preset temperature, then step S16 is executed to determine whether an air guide plate is present at the air outlet of the target indoor unit.

[0167] 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 the 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.

[0168] In some embodiments, the indoor unit may include an air guide plate rotatably connected to the unit 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 is opened.

[0169] The indoor unit may include an air deflector motor, wherein the air deflector motor is connected to the air deflector and is used to drive the air deflector to rotate and open or cover the air outlet of the air conditioner.

[0170] It is understood that the air deflector motor is electrically connected to the controller so that the air deflector motor is controlled by the controller. The controller can detect whether there is an air deflector at the air outlet of the indoor unit.

[0171] In this embodiment, when the electronic expansion valve is not detected or is in the open state, refrigerant is flowing through the indoor heat exchanger. Under this condition, the internal coil temperature is compared with the preset temperature. If the internal coil temperature is lower than the preset temperature, it indicates that the outdoor unit's compressor is not operating or is operating at a low frequency. The thermal radiation from the indoor heat exchanger of the target indoor unit has little impact on the ambient temperature sensor 61. Therefore, under this condition, the sampled indoor ambient temperature can be considered the actual indoor ambient temperature, and heating operation can be performed directly, ensuring that the target indoor unit starts up promptly and enters heating mode.

[0172] In some other embodiments of the present application, the controller is further configured to:

[0173] If the target indoor unit has an air deflector, the air deflector is controlled to move to the open position;

[0174] The cross-flow fan is controlled to operate at a first speed. After a preset time, the current indoor ambient temperature is sampled, and the target indoor unit is controlled to enter a heating operation mode according to the sampled indoor ambient temperature.

[0175] Specifically, continue to refer to Figure 4 After executing step S16, if yes, that is, the target indoor unit has an air guide plate, the control executes step S17: the air guide plate is moved to the open position. After executing step S17, step S18 is executed: the crossflow fan is controlled to operate at the first speed for a preset time.

[0176] 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.

[0177] In this embodiment, when the indoor unit is equipped with an air deflector, the deflector is controlled to open the air outlet of the air conditioner, and the crossflow fan is controlled to operate at a first speed for a preset time. This accelerates heat dissipation from the target indoor unit and reduces the ambient temperature around the target indoor unit, thereby reducing the interference of heat radiation from the indoor heat exchanger on the value detected by the ambient temperature sensor 61. After the crossflow fan has been operated at the first speed for the preset time, the error between the indoor ambient temperature detected by the ambient temperature sensor 61 and the actual indoor ambient temperature is negligible. At this point, the indoor ambient temperature detected by the ambient temperature sensor 61 is sampled again and used to directly operate the heating system based on this temperature.

[0178] 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 cross-flow blower.

[0179] 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.

[0180] In some other embodiments of the present application, the first speed n is n>10 rpm and n≤100 rpm.

[0181] The first speed n cannot be too low. If it is too low, the air flow around the indoor unit will not be effectively driven, and the indoor ambient temperature cannot be accurately detected before heating is activated. To ensure accurate indoor ambient temperature detection when the target indoor unit is heated, the first speed n is set to be greater than the seventh parameter value. For example, the seventh parameter value can be 10 rpm, 13 rpm, or 15 rpm. Consider selecting an appropriate parameter during the specific design.

[0182] The first speed n cannot be too high. A too high speed will result in excessive wind speed, which in turn leads to lower air outlet temperature and affects user comfort. To ensure user comfort, the first speed n is set to no greater than the eighth parameter value. For example, the eighth parameter value can be 100 rpm, 95 rpm, or 90 rpm. Consider selecting an appropriate and specific parameter during specific design.

[0183] In some other embodiments of the present application, the first speed n is 10 rpm. <n≤100rpm。

[0184] In this embodiment, setting the first speed n within a reasonable range can not only effectively drive the air flow around the indoor unit and ensure the accuracy of indoor ambient temperature detection before heating starts, but also ensure user comfort and improve user experience.

[0185] In some other embodiments of the present application, the preset time may be no less than 1 minute.

[0186] 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 testing. 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.

[0187] 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. In other words, when the air guide plate is in the open position, the air conditioner outlet blows air upward.

[0188] 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, preventing the cold wind from blowing directly on people and improving user comfort.

[0189] Among them, when the first speed is in the lower speed range mentioned above, the lower first 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, further improving the user comfort.

[0190] In some other 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 the preset compensation condition.

[0191] refer to Figure 5 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.

[0192] Specifically, if the target indoor unit's air outlet is not equipped with an air deflector, turning on the crossflow fan will lower the outlet air temperature, thereby reducing user comfort. Therefore, if the target indoor unit's air outlet is not equipped with an air deflector, turning on the crossflow fan to drive airflow around the indoor unit cannot reduce the interference of thermal radiation on the ambient temperature sensor 61.

[0193] In this embodiment, when the target indoor unit lacks an air deflector, the indoor ambient temperature is compensated based on the outdoor unit's operating status and the internal coil temperature. This minimizes the error between the compensated indoor ambient temperature and the actual indoor ambient temperature, ensuring accurate indoor temperature detection before the target indoor unit starts heating. After temperature compensation, the compensated indoor ambient temperature is incorporated into the air conditioning system for direct heating operation, ensuring timely startup of the indoor unit and user comfort.

[0194] In some other embodiments of the present application, the first logic setting is: T1 = d*Tin / F+e, where d and e are correction coefficients, Tin is the sampled inner coil temperature, F is the operating frequency of the compressor, and T1 is the temperature compensation value.

[0195] Specifically, the temperature compensation value T1 is calculated based on the compressor's operating frequency F and the internal coil temperature Tin. d and e are correction coefficients, which can be constants. A higher compressor frequency results in a higher internal coil temperature, and the ratio of these two (Tin / F) is affected by the actual indoor ambient temperature.

[0196] If the actual indoor ambient temperature is low, the ratio will be low, and vice versa. Here, 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 derived from the first logical operation increases. The controller obtains the corrected indoor ambient temperature, or compensated indoor ambient temperature, and applies this corrected compensated indoor ambient temperature to the air conditioning system to begin heating operation. Compensated indoor ambient temperature = indoor ambient temperature detected by the ambient temperature sensor - temperature compensation value T1.

[0197] In some embodiments, the temperature compensation value T1 may be any value between 2°C and 10°C.

[0198] The multi-split air conditioning system provided by the present invention has a simple structure, is easy to operate, requires no additional hardware, and saves costs. It can accurately detect the indoor ambient temperature before the multi-split system starts heating under various conditions, making the indoor ambient temperature detection more accurately reflect the actual indoor ambient temperature, ensuring timely startup of the indoor units and ensuring user comfort. The multi-split air conditioning system provided by the present invention is more suitable for indoor ambient temperature detection when used as a multi-split system in ducted air conditioners or small indoor unit space.

[0199] In addition, the embodiments of the present application provide hardware structures and / or software modules that perform the corresponding functions. Those skilled in the art should readily appreciate that, in conjunction with the modules and algorithmic steps of the various examples 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 performed in a hardware or computer software driven hardware manner 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 be beyond the scope of the present invention.

[0200] In the embodiment of the present application, the controller can be divided into functional modules according to the above-mentioned 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-mentioned 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. In actual implementation, there may be other division methods.

[0201] In some other embodiments of the present application, the indoor unit may be a ducted unit that can be installed in a suspended ceiling or on the ceiling and can be used as a living room air conditioner, curtain air conditioner, or ceiling air conditioner to exchange heat with the indoor environment.

[0202] Specifically, the ducted air conditioner may include a body. The body 10 has a top and a bottom. The top and bottom of the body 10 are two opposite ends of the body 10 in the vertical direction (the thickness direction of the body 10). The left side and the right side of the body 10 are two opposite sides of the body 10 in the length direction, and the front side and the rear side of the body 10 are two opposite sides of the body 10 in the width direction.

[0203] The air inlet 102 and the air outlet 103 are respectively provided at both ends of the body 10 in the width direction thereof.

[0204] refer to Figures 6 to 10 The body 10 may include a top plate 104 . The top plate 104 forms the top end of the body 10 .

[0205] The body 10 may include a bottom plate 105. The bottom plate 105 forms the bottom end of the body 10, and the top end and the bottom end are two opposite ends of the body 10 in the thickness direction thereof.

[0206] The body 10 may include two side panels. The two side panels are oppositely disposed at the ends of the body 10 in its own length direction and are connected to the left and right sides of the top plate 104. The two side panels are respectively a first side panel 106 and a second side panel 107.

[0207] The body 10 may include a front panel. The front panel forms the front end of the body 10 and is provided with an air-conditioning outlet 103.

[0208] The body 10 may include a rear panel. The rear panel forms the rear end of the body 10 and is provided with an air conditioning air inlet 102. The front panel and the rear panel are arranged opposite to each other along the width direction of the body.

[0209] The top plate 104 , the bottom plate 105 , the two side plates, the front plate and the rear plate together form a receiving chamber 101 .

[0210] The top plate 104, the bottom plate 105, the side plates, the front plate and the rear plate may be connected in a separate manner or in an integrated manner.

[0211] In this embodiment, the side panels are bent and extended toward the opposite sides of the housing 10 at both ends in the width direction to form portions of the front and rear panels. Therefore, the top panel 104, bottom panel 105, and the end portions formed by the side panels form the air conditioning inlet 102 at the rear side of the housing 10 and the air conditioning outlet 103 at the front side of the housing 10.

[0212] It should be noted that the directions described in the article are based on the direction in which the user faces the indoor unit. The side of the indoor unit facing the user when in use is defined as the front side, and 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 indoor unit, and the upper and lower sides of the indoor unit when it is generally working normally are defined to distinguish between up and down.

[0213] In a ducted air conditioner, the crossflow fan 31 extends along the length of the housing 10. In other words, the length of the housing 10 corresponds to the axial direction of the crossflow fan 31. Due to the small size of the crossflow fan 31, the size of the ducted air conditioner 100 is further reduced, which reduces the depth of the suspended ceiling, meeting the narrow depth requirement, alleviating the feeling of oppression in the room, and improving the room's aesthetics.

[0214] The indoor heat exchanger 21 in the ducted air conditioner can be a multi-stage heat exchanger. The indoor heat exchanger 21 comprises multiple stages connected from top to bottom, forming a semi-enclosed structure. A portion of the crossflow fan 31 is disposed within this semi-enclosed structure, transforming the crossflow fan 31 and the indoor heat exchanger 21 from being separated to overlapping. This significantly reduces the space occupied by the indoor heat exchanger 21 and the crossflow fan 31 while maintaining their respective volumes.

[0215] In a ducted air conditioner, the crossflow fan extends along the length of the air conditioner body 10. In other words, the length of the air conditioner body 10 is the axial direction of the crossflow fan. Due to the smaller size of the crossflow fan, the ducted air conditioner can be further reduced in size, reducing the depth of the ceiling, meeting the narrow depth requirement, alleviating the feeling of oppression in the room, and improving the room's aesthetics.

[0216] In some embodiments of the present application, referring to FIG10 , the duct unit 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 unit body 10 .

[0217] In some embodiments of the present application, the duct air conditioner 100 may include a water receiving pan 5. The water receiving pan 5 is provided at the bottom of the accommodating chamber 101 and is used to receive condensed water flowing from the indoor heat exchanger 21 when the duct air conditioner 100 is in operation. The water receiving pan 5 is provided with a drain port for draining the condensed water in the water receiving pan 5 out of the duct air conditioner 100.

[0218] In some embodiments, the air duct unit 100 may include a base 38. The base 38 is disposed in the accommodating cavity 101 to mount the fan assembly 3 and the heat exchanger assembly 2.

[0219] In some embodiments of this application, continue to refer to Figure 11The base 38 is provided with a first mounting groove 381 at one end in the longitudinal direction thereof. The first mounting groove 381 is located at one end in the axial direction of the cross-flow fan 31 .

[0220] The driving motor 32 is installed in the first installation slot 381 . The output shaft of the driving motor 32 is connected to the shaft sleeve of the cross-flow fan 31 via a fixing screw to drive the cross-flow fan 31 to rotate.

[0221] The duct unit 100 may include an electric control assembly. The electric control assembly may include an electric control board, which is electrically connected to electrical components inside the unit body 10 via electric control lines.

[0222] It can be understood that the electric control board is configured to be electrically connected to the above-mentioned compressor, expansion valve and cross-flow fan 31 at least through electric control, so as to control at least the compressor, expansion valve and cross-flow fan 31, thereby controlling the operation of the entire duct machine 100 and realizing various predetermined functions of the air conditioner.

[0223] The electric control board can transmit signals to the wire controller or remote controller via a communication line. The wire controller or 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 ducted air conditioner 100.

[0224] The heat exchanger assembly 2 may include an end plate. The end plate is located in the housing 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 longitudinal direction to fix the indoor heat exchanger 21.

[0225] refer to Figure 10 、 16 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 longitudinal direction, and the second end plate 23 is connected to the other end of the indoor heat exchanger 21 in the longitudinal direction.

[0226] 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 .

[0227] 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 .

[0228] The indoor heat exchanger 21 is provided on 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.

[0229] By setting up 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.

[0230] The outdoor unit may include an outdoor housing. An outdoor heat exchange duct may be disposed within the outdoor housing. The outdoor housing may include an outdoor air inlet. The outdoor air inlet may be connected to the outdoor heat exchange duct. The outdoor air inlet may be used to introduce outdoor air into the outdoor heat exchange duct.

[0231] The outdoor housing may include an outdoor air outlet. The outdoor air outlet may be connected to the outdoor heat exchange duct. The outdoor air outlet may be used to draw air from the outdoor heat exchange duct to the outside of the outdoor heat exchange duct. The outdoor heat exchanger and the compressor may be disposed in the outdoor heat exchange duct.

[0232] The outdoor unit may include an outdoor fan. The outdoor fan may be located within the outdoor heat exchange duct. The rotation of the outdoor fan causes outdoor air to enter the heat exchange duct through the outdoor air inlet, where it exchanges heat with the outdoor heat exchanger. The heat-exchanged outdoor air then flows out of the outdoor heat exchange duct through the outdoor air outlet.

[0233] An air conditioning system may include a throttling device. The throttling device is used to throttle the air flow. The throttling device may be provided in an indoor unit or an outdoor unit.

[0234] The air conditioning system performs the refrigeration cycle of the air conditioner by using a compressor, condenser, throttling device and 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.

[0235] The condenser condenses the compressed refrigerant into liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0236] 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.

[0237] 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.

[0238] The evaporator can achieve a cooling 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.

[0239] Of 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 heating mode, and when the indoor heat exchanger 21 is used as an evaporator, the air conditioning system is used as a cooler in cooling mode.

[0240] In some other embodiments of the present application, the temperature detection assembly 6 may include a sensor bracket 62 . The sensor bracket 62 is formed with a mounting portion 621 for embedding the ambient temperature sensor 61 , and the sensor bracket 62 is fixed to the end plate or the rear panel 1081 .

[0241] 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.

[0242] The different locations of the ambient temperature sensor 61 result in different degrees of influence from the heat radiation. The farther the ambient temperature sensor 61 is from the indoor heat exchanger 21, the less heat radiation it receives.

[0243] In some other embodiments of the present application, considering the detection of the indoor ambient temperature when the cross-flow fan is rotating, in order to ensure good tracking of the indoor ambient temperature when the cross-flow 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.

[0244] To facilitate the installation of the ambient temperature sensor 61, refer to Figures 12 to 15 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.

[0245] refer to Figure 17 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 the need for wire ties, which has a simple structure and is easy and quick to assemble, saving costs.

[0246] In this embodiment, the sensor bracket 62 is disposed on the second end plate 23. Of course, in other embodiments, the sensor bracket 62 may be disposed on the first end plate 22.

[0247] 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.

[0248] The temperature detection assembly 6 may include a through-hole. 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 facing 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.

[0249] In this embodiment, the through-hole is provided so that air near the sensor bracket 62 can circulate when the cross-flow fan 31 rotates.

[0250] It is understood that a properly positioned ambient temperature sensor 61 can provide accurate indoor ambient temperature, thereby ensuring accurate air conditioning operation (cooling, heating, etc.). Improper positioning of the ambient temperature sensor 61 can easily cause the ambient temperature sensor 61 to be affected by condensed water, the indoor heat exchanger 21, the refrigerant temperature, and other factors, leading to abnormal shutdowns and abnormal startups, affecting normal user use.

[0251] In the related art, the ambient temperature sensor 61 is too close to the indoor heat exchanger 21, and is affected by the temperature of the indoor heat exchanger 21, resulting in inaccurate temperature data, which in turn leads to inaccurate air conditioning control, reducing user experience and affecting product experience.

[0252] In order to improve the detection accuracy of the ambient temperature sensor 61 on the indoor ambient temperature, provide the electronic control board with accurate indoor ambient temperature, and achieve 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.

[0253] Among them, the sensor bracket 62 is set close to the air inlet of the air conditioner, so that the ambient temperature sensor 61 is set 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.

[0254] The sensor bracket 62 is located on the side of the end plate away from the indoor heat exchanger 21. That is, in the longitudinal direction of the body, the sensor bracket 62 is arranged relative to the end plate away from the indoor heat exchanger 21, that is, the sensor bracket 62 is arranged on the outer surface of the end plate.

[0255] 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 actions, and improving the user experience.

[0256] 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 unit body 10 .

[0257] For further reference, Figure 17 In some embodiments, the sensor bracket 62 is provided with a first communication port 622 for connecting the mounting portion 621 with the indoor environment. The first communication port 622 is connected to the through-port through the mounting portion 621 to form an airflow path.

[0258] In this embodiment, an airflow path is provided so that when the ducted air conditioner is in operation, the crossflow fan 31 rotates to drive indoor air through the air conditioning inlet and into the air conditioner body. The crossflow fan 31 rotates to drive the indoor air around the ambient temperature sensor 61, which then flows through the airflow path and passes through the ambient temperature sensor 61, thereby improving temperature detection accuracy and enabling the ambient temperature sensor 61 to accurately detect the indoor ambient temperature.

[0259] In some embodiments of the present application, a blocking portion 65 is connected to the sensor bracket 62 .

[0260] Continue to refer Figure 17 The blocking portion 65 is provided 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 .

[0261] 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.

[0262] 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 of the existing technology, thereby increasing the range of the installation position of the ambient temperature sensor 61.

[0263] In related art, the ambient temperature sensor 61 is often located near the top of the end plate. The temperature of the refrigerant in the indoor heat exchanger 21 can also affect the detection accuracy of the ambient temperature sensor 61. For example, in a certain state, when refrigerant is circulating in the indoor heat exchanger 21 and the indoor heat exchanger 21 is hot, the cold air surrounding the indoor heat exchanger 21 exchanges heat with the indoor heat exchanger 21. After the exchange, the hot air, due to its light specific gravity, floats upward and easily surrounds the ambient temperature sensor 61. At this time, if a heating command is received and the temperature detected by the ambient temperature sensor 61 is higher than the command set temperature, the ducted air conditioner 100 will shut down and not operate, affecting user experience.

[0264] In order to solve the above technical problems, in some embodiments of the present application, the sensor bracket 62 is fixed to the end plate and is arranged close to the bottom end of the end plate.

[0265] In this embodiment, by setting the sensor bracket 62 close to the bottom end of the end plate, the sensor bracket 62 is set 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.

[0266] In some other embodiments, reference Figure 18 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.

[0267] The ducted air conditioner provided in this embodiment utilizes a sensor bracket 62 to securely clamp the ambient temperature sensor 61, eliminating the need for wire ties. This results in a simple structure and quick and easy assembly. By placing the sensor bracket 62 on the rear panel, the ambient temperature sensor 61 is positioned on the rear panel. This not only distances the ambient temperature sensor 61 from the indoor heat exchanger 21 but also eliminates any obstruction between the sensor 61 and the indoor heat exchanger 21. This ensures that the indoor ambient temperature detected by the sensor 61 is unaffected by the indoor heat exchanger 21, improving detection accuracy, avoiding inaccurate air conditioning control, and enhancing the user experience.

[0268] In some embodiments, a mounting opening 624 is defined on the sensor bracket 62 , and the mounting opening 624 is located at one end of the mounting portion 621 in the length direction.

[0269] refer to Figure 17 The mounting opening 624 is connected to the mounting portion 621 for the ambient temperature sensor 61 to pass through. During assembly, the ambient temperature sensor 61 is installed in the mounting portion 621 through the mounting opening 624, which facilitates the installation of the ambient temperature sensor 61.

[0270] When the sensor bracket 62 is fixed to the outer surface of the end plate, the sensor bracket 62 can extend along the length direction of the body, or the sensor bracket 62 can extend along the width direction of the body. Specifically, when the sensor bracket 62 is fixed to the end plate and extends along the length direction of the body, the mounting opening 624 can be arranged to coincide with the through opening.

[0271] In some embodiments of the present application, reference is made to Figure 18 The 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 provided for the electric control line of the ambient temperature sensor 61 on the rear panel to pass through.

[0272] 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. The electrical control wires of the ambient temperature sensor 61 are sequentially passed through the wire holes 66 and the wire pass portion 64 to be electrically connected to the electrical control board. The provision of the wire holes 66 facilitates the routing of the ambient temperature sensor 61.

[0273] In some embodiments of the present application, reference is made to Figures 19 to 23 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.

[0274] 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.

[0275] In order to improve the detection accuracy of the indoor ambient temperature by the ambient temperature sensor 61, the accurate indoor ambient temperature is provided to the electric control board to achieve accurate air conditioning operation. Figure 21 , the minimum distance L between the ambient temperature sensor 61 and the indoor heat exchanger 21 is set to be greater than 15 mm.

[0276] The minimum distance between the ambient temperature sensor 61 and the indoor heat exchanger 21 is greater than 15 mm, which makes the distance between the ambient temperature sensor 61 and the indoor heat exchanger 21 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 action, and improving user experience.

[0277] In some embodiments of the present application, a wire pass portion 64 is provided on the side of the end plate away from the indoor heat exchanger 21. The wire pass portion 64 is used to allow the electric control wire of the ambient temperature sensor 61 to pass through. At least one wire pass portion 64 may be provided.

[0278] 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.

[0279] 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 for wire tying, which is convenient and quick.

[0280] In some embodiments of this application, continue to refer to Figure 22 An electrical box 72 is provided at one end of the body 10 in the longitudinal direction. The electrical control board is provided inside the electrical box 72. The electrical control board is electrically connected to the ambient temperature sensor 61.

[0281] 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 electrical 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 body 10, and the electrical box 72 is arranged at the left end of the body 10.

[0282] In this embodiment, the electrical wiring of the ambient temperature sensor 61 passes through the wire pass 64 and is electrically connected to the electronic control board. By placing the electrical box 72 close to the sensor bracket 62, the length of the electrical wiring of the ambient temperature sensor 61 is shortened, facilitating wiring and wiring layout while also saving costs. During assembly, the ambient temperature sensor 61 is inserted into the mounting portion 621 through the mounting opening 624. The electrical wiring of the ambient temperature sensor 61 passes through the wire pass 64 and is electrically connected to the electronic control board.

[0283] In some embodiments of the present application, when the sensor bracket 62 is fixed on the inner side of the end plate, the duct unit 100 further includes a guide portion 63. The guide portion 63 is provided on the side of the end plate close to the middle of the body 10.

[0284] refer to Figure 23 The air guide 63 is provided 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.

[0285] By setting up 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 improving the service life of the ambient temperature sensor 61 and at the same time preventing the condensed water from affecting the detection accuracy of the ambient temperature sensor 61.

[0286] In some embodiments of the present application, the guide portion 63 is tilted downward toward the indoor heat exchanger 21. The guide portion 63 may be a guide groove structure, which can guide the condensed water and receive it at the same time.

[0287] The guide part 63 is set 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, effectively preventing the condensed water from entering the ambient temperature sensor 61.

[0288] In the above embodiment, the ambient temperature sensor 61 is mounted on the end plate or rear panel via the sensor bracket 62. This ensures proximity to the electrical control panel while ensuring that the difference between the detected indoor ambient temperature and the actual indoor ambient temperature remains within a certain range, regardless of whether the crossflow fan 31 is operating. Furthermore, when the internal coil temperature reaches 50°C or above, the difference between the detected indoor ambient temperature and the actual indoor ambient temperature is within a first threshold. Once air is supplied, i.e., when the crossflow fan 31 is operating, the difference between the detected indoor ambient temperature and the actual indoor ambient temperature is within a second threshold. The second threshold is smaller than the first threshold.

[0289] refer to Figures 24 to 33 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.

[0290] 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.

[0291] Among them, reference Figure 28 Heat exchange tube 216 is a U-shaped tube. Specifically, heat exchange tube 216 can include two straight tubes 2161. Straight tubes 2161 extend along the length of the machine body, with both ends of straight tube 2161 extending to the two end plates. In other words, the length of straight tube 2161 is the distance between the two end plates.

[0292] 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 up to three heat exchange tubes 216 connected in sequence.

[0293] In some embodiments of the present application, the refrigerant flow path 215 is for the refrigerant to flow, wherein the length of the refrigerant flow path 215 does not exceed 7000 mm.

[0294] 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.

[0295] In the related art, the heat exchange tubes 216 in the indoor heat exchanger 21 mostly use small-diameter internal threaded tubes, i.e., fine threaded tubes. The fine threaded tubes 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 in 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.

[0296] 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 ring, resulting in uneven diversion of the refrigerant, affecting the heat exchange capacity of the indoor heat exchanger 21.

[0297] In order to solve the above technical problems, in some embodiments of the present application, reference is made to Figure 29 A diverter pipe 81 is provided at the inlet pipe 85 in the inlet pipe assembly 8 .

[0298] Specifically, the inlet pipe assembly 8 may include a diverter pipe 81. The diverter pipe 81 is a tee piece.

[0299] The diverter 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 .

[0300] The diverter pipe 81 may include a vertical pipe section. The vertical pipe section is vertically connected to the horizontal pipe section. One end of the vertical pipe section is vertically connected to the horizontal pipe section, and the other end of the vertical pipe section is connected to the diverter inlet of the diverter 84.

[0301] Inlet pipe assembly 8 may include a blind leg 82. One end of blind leg 82 is closed, and the other end is connected to the second end of the horizontal pipe segment. In this embodiment, the provision of blind leg 82 ensures consistent refrigerant flow before diverter 84, thereby making the diversion of the refrigerant more uniform and improving the reliability and consistency of the diversion.

[0302] 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.

[0303] In some embodiments of the present application, the inlet pipe assembly 8 may include an inlet straight pipe 83. The vertical pipe section is connected to the diversion inlet through the inlet straight pipe 83.

[0304] In this embodiment, the provision of the inlet straight pipe 83 does not affect the uniformity of the diversion, thereby ensuring the uniformity of the diversion.

[0305] 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 disposed through the heat exchange fins.

[0306] The tri-fold heat exchanger has tri-fold heat exchange fins. The heat exchange fins have a windward side and a leeward side, and multiple 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, enabling faster and more thorough heat exchange of the passing air, thereby further improving heat exchange quality.

[0307] The refrigerant flow path 215 may include at least one heat exchange tube 216 close to the windward side.

[0308] 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 via a connecting tube.

[0309] The above-mentioned setting makes the refrigerant flow path 215 a double-row pipeline, and makes the setting 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 at the same time preventing the large outlet temperature difference of multiple refrigerant flow paths 215 from causing condensation.

[0310] 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, each of the plurality of refrigerant flow paths 215 includes the same number of heat exchange tubes 216. In other words, the refrigerant flow path length of each refrigerant flow path 215 is the same.

[0311] Specifically, in this embodiment, the indoor heat exchanger 21 includes 18 U-shaped tubes, which are divided into 6 refrigerant flow paths 215 .

[0312] refer to Figure 27 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 three heat exchange tubes 216 to ensure that the length and number of each U-shaped tube are the same.

[0313] In this embodiment, the wind field flow velocity is distributed relatively evenly for each refrigerant flow path 215. When the wind speed deviation of each U-shaped tube is within 0.7 m / 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.

[0314] The refrigerant flow is not limited to Figure 27 According to the change of wind field, the refrigerant flow of indoor heat exchanger 21 can be designed as follows Figure 32 As shown. Figure 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.

[0315] 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 and the better the heat exchange performance at the location of the refrigerant flow path 215, the fewer heat exchange tubes 216 are included in the refrigerant flow path 215.

[0316] In this embodiment, when the flow velocity in 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.

[0317] Specifically, when the wind speed deviation between each heat exchange tube 216 exceeds 0.7 m / s, the equal distribution scheme of the refrigerant flow path 215 cannot meet the requirements of the diversion design. Therefore, in order to fully utilize the performance of the indoor heat exchanger 21, the number of U-shaped tubes in the refrigerant flow path 215 is increased at locations on the air inlet side of the indoor heat exchanger 21 where the air volume or wind speed is low and the heat exchange performance is poor, thereby improving the heat exchange efficiency of the refrigerant flow path 215 at these locations.

[0318] On the air inlet side of the indoor heat exchanger 21, where the wind speed or air volume is high and the heat exchange performance is good, 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 passing through this location increases the heat exchange efficiency of the refrigerant flow path 215, maximizing the use of outside air and avoiding waste of external airflow. It also makes the heat exchange efficiency of the refrigerant flow path 215 at high and low wind speed locations on the indoor heat exchanger 21 uniform, thereby improving the overall heat exchange efficiency of the indoor heat exchanger 21 while maintaining the external air flow environment.

[0319] refer to Figure 33 Among them, the wind speed in the upper part of the second-stage heat exchanger 213 is relatively large, so the number of heat exchange tubes 216 in the refrigerant flow path 215 at this position is reduced, and the wind speed in the lower part of the first-stage heat exchanger 212 is relatively small compared to other heat exchangers. Therefore, the number of heat exchange tubes 216 in the refrigerant flow path 215 at this position is increased.

[0320] In some embodiments of the present application, reference is made to Figure 32 The first section heat exchanger 212 and the second section heat exchanger 213 are completely cut apart at their connecting portion. The first section heat exchanger 212 and the second section heat exchanger 213 are plugged and arranged at a first preset angle.

[0321] Specifically, in the above embodiment, the first-stage heat exchanger 212 and the second-stage heat exchanger 213 are fully cut. This arrangement frees the angle between the first-stage heat exchanger 212 and the base plate from structural constraints, increasing the flexibility of the first-stage heat exchanger 212. Furthermore, it allows the fins of the first-stage heat exchanger 212 and the second-stage heat exchanger 213 to have sufficient contact area, thereby allowing condensed water to flow more easily from the first preset angle to the bottom.

[0322] In some embodiments of the present application, reference is made to Figure 31 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.

[0323] In this embodiment, the first section heat exchanger 212 and the second section heat exchanger 213 are an integrated structure, which is cut and bent to obtain the first section heat exchanger 212 and the second section heat exchanger 213 arranged at an angle.

[0324] Specifically, the indoor heat exchanger 21 includes heat exchange fins, which are provided with a special-shaped cutting structure. The special-shaped cutting structure divides the heat exchanger fins 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 the first section of heat exchange fins and the second section of heat exchange fins are set at a preset angle.

[0325] In some embodiments of the present application, the indoor heat exchanger 21 is a three-fold heat exchanger, wherein the indoor heat exchanger 21 may include a plurality of heat exchange tubes 216 , which are connected to form a plurality of refrigerant flow paths 215 , and the plurality of refrigerant flow paths 215 are arranged in parallel.

[0326] refer to Figure 32 In this embodiment, the ends of the heat exchange tubes 216 are connected by connecting tubes 217 to form six parallel refrigerant flow paths 215.

[0327] The heat exchanger assembly 2 may include an end plate. The end plate is located in the body 10.

[0328] Two end plates are provided, and the two end plates are respectively connected to both ends of the indoor heat exchanger 21 in the length direction, and are used to fix the indoor heat exchanger 21.

[0329] In some embodiments of the present application, the distance between the two end plates is not less than 1000 mm.

[0330] It is understandable that the three-fold heat exchanger includes three heat exchange fins, and a plurality of heat exchange tubes 216 are provided through the three heat exchange fins. The heat exchange tubes 216 are U-shaped tubes.

[0331] Specifically, heat exchange tube 216 may include two straight tubes 2161 extending along the length of the housing. The two ends of straight tube 2161 extend to two end plates. Heat exchange tube 216 may include an elbow 2162. Adjacent ends of the two straight tubes 2161 are connected by the elbow 2162.

[0332] 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, which makes it impossible for the ducted air conditioner to exert its maximum capacity in cooling and heating states, and its market competitiveness is relatively poor.

[0333] In order to maximize the performance of the ducted air conditioner in cooling and heating states, in some embodiments of the present application, the refrigerant flow path 215 is diverted.

[0334] Specifically, refer to Figure 34 、 Figure 35 The refrigerant flow path 215 may include one inlet. In the cooling mode, the refrigerant enters the corresponding refrigerant flow path 215 through the multiple inlets.

[0335] 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.

[0336] In this embodiment, in the cooling mode, each refrigerant flow path 215 is set to one inlet and two outlets, that is, each refrigerant flow path 215 is diverted. This can greatly reduce the pressure drop during cooling and conform to 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 ducted air conditioner can exert its maximum capacity in the cooling and heating states.

[0337] In some embodiments of the present application, reference is made to Figure 36 , a refrigerant flow path 215 relatively close to the bottom plate among the multiple 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.

[0338] Specifically, the first refrigerant flow path 2151 is located at the bottom of the indoor heat exchanger 21. In cooling mode, condensed water accumulates at the bottom of the indoor heat exchanger 21, resulting in a lower heat exchange capacity for the first refrigerant flow path 2151 than for the other refrigerant flow paths. In this embodiment, the first refrigerant flow path 2151 is not shunted to ensure its heat exchange capacity and avoid further deterioration.

[0339] refer to Figures 36 to 38 The first refrigerant flow path 2151 may include an inlet, through which the refrigerant enters the first refrigerant flow path 2151 .

[0340] 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.

[0341] The duct air conditioner provided in this embodiment, in the cooling mode, except for the first refrigerant flow path 2151, sets at least part of the other refrigerant flow paths as one inlet and two outlets, that is, at least one of the other refrigerant flow paths 215 is diverted. This can greatly reduce the pressure drop during cooling, comply with the refrigerant flow state during heating, increase the refrigerant flow rate at the same compressor frequency, and improve the heating capacity, so that the duct air conditioner can exert its maximum capacity in the cooling and heating states.

[0342] In the cooling mode, the first refrigerant flow path 2151 is not diverted to ensure the heat exchange capacity of the first refrigerant flow path 2151 and thus ensure the heat exchange effect of the entire indoor heat exchanger 21 .

[0343] The three-fold heat exchanger may include a first stage heat exchanger 212. Figure 36 The first stage heat exchanger 212 is located below the cross-flow fan 31 .

[0344] In some embodiments of the present application, the ducted air conditioner may include a water receiving tray 5. The water receiving tray 5 is provided on the bottom plate 105 and is located below the indoor heat exchanger 21 for receiving condensed water dripping from the indoor heat exchanger 21 in cooling mode.

[0345] In some embodiments, the first refrigerant flow path 2151 close to the bottom plate is disposed on the first heat exchanger 212 , wherein the inlet and outlet of the first refrigerant flow path 2151 are disposed on the first heat exchanger 212 .

[0346] By arranging the first refrigerant flow path 2151 and the inlet and 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.

[0347] An acute angle is formed between the first section 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 accumulation of condensed water in the first refrigerant flow path 2151 .

[0348] The first section heat exchanger 212 and the horizontal plane where its free end is located form an acute angle with the opening facing the air inlet 102. The first section heat exchanger 212 is a plate-shaped heat exchanger.

[0349] 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 lies, causing the first heat exchanger 212 to be tilted. The opening of this angle faces the air inlet 102, causing the free end of the first heat exchanger 212 to be lower than its connection end. During cooling operation of the ducted air conditioner, condensed water on the indoor heat exchanger 21 can collect at the free end and drip into the water tray 5.

[0350] In the related art, there is a technical solution in which the first-stage heat exchanger 212 is arranged parallel to the bottom plate 105. This solution causes condensed water from the indoor heat exchanger 21 to accumulate on the first-stage heat exchanger 212, which is not conducive to improving heat exchange efficiency. In this embodiment, the first-stage heat exchanger 212 is arranged at an angle. Compared with the existing technology, this not only prevents condensed water from accumulating on the entire bottom surface of the first-stage heat exchanger 212, but also increases the air intake of the first-stage heat exchanger 212, thereby improving the heat exchange capacity of the first-stage heat exchanger 212.

[0351] In some embodiments of the present application, reference is made to Figure 36 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 the other end of the first stage heat exchanger 212.

[0352] 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 is connected to the other end of the second-stage heat exchanger 213 .

[0353] That is, the first, second, and third heat exchangers 212, 213, 214 are sequentially connected from bottom to top to form a semi-enclosed structure. The semi-enclosed structure has an opening toward the crossflow fan 31, partially surrounding the crossflow fan 31. This allows the indoor heat exchanger 21 to semi-enclose the outer circumference of the crossflow fan 31, thereby improving the heat exchange efficiency of the indoor heat exchanger 21.

[0354] In some embodiments of the present application, double rows of heat exchange tubes 216 are provided in the first-stage heat exchanger 212 , the second-stage heat exchanger 213 , and the third-stage heat exchanger 214 .

[0355] By arranging 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.

[0356] In some embodiments of the present application, the heat exchange tube 216 is an internally threaded tube with an inner diameter not exceeding 5 mm, so that the indoor heat exchanger 21 can obtain a greater heat exchange capacity within the same heat exchanger area. In this embodiment, the heat exchange tube 216 is a 5 mm internally threaded copper tube.

[0357] The internal threaded tube is provided on the indoor heat exchanger 21, and the flow direction of the refrigerant is guided by the internal threaded tube in the indoor heat exchanger 21. Among them, the internal threaded tubes in the refrigerant flow path 215 are all designed to be straight-inserted, which is more convenient to operate and has higher processing efficiency.

[0358] The high internal friction coefficient of 5mm internally threaded copper tubes creates greater resistance to refrigerant flow, resulting in a greater pressure drop. Therefore, to further ensure a reasonable pressure drop within the indoor heat exchanger 21 and maximize the performance of the indoor heat exchanger 21, in some other embodiments, the indoor heat exchanger 21 using 5mm internally threaded copper tubes requires a corresponding increase in the number of diversion branches.

[0359] 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 to ensure that the pressure drop of the indoor heat exchanger 21 is within a normal range during cooling and that the temperature at the diversion outlet is consistent, thereby ensuring heat exchange capacity.

[0360] In this embodiment, six refrigerant flow paths 215 are provided. Increasing the number of flow paths can effectively reduce the refrigerant flow velocity in the tube and lower the flow resistance.

[0361] 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.

[0362] refer to Figure 36 The indoor heat exchanger 21 can 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, ensuring that the length and number of U-shaped tubes in each path are the same. By adopting an evenly divided refrigerant flow path 215, the uniformity of refrigerant flow is improved.

[0363] In some embodiments of the present application, the six refrigerant flow paths 215 are each configured as a double-row pipe. In cooling mode, this configuration allows the refrigerant in each refrigerant flow path 215 to be fully evaporated, reducing the temperature difference between the refrigerant flow paths 215.

[0364] In some embodiments of the present application, the indoor heat exchanger 21 may include 10 to 26 U-shaped tubes. It is understood that the number of U-shaped tubes in the indoor heat exchanger 21 can be appropriately configured based on the limitations of the machine body and the crossflow fan 31. The number of U-shaped tubes can be increased or decreased to ensure that the indoor heat exchanger 21 does not interfere with the machine structure after placement and that the crossflow air duct can function effectively.

[0365] In some embodiments of the present application, the refrigerant flow path 215 having one inlet and two outlets is defined as the second refrigerant flow path 2152 .

[0366] refer to Figure 36 The second refrigerant flow path 2152 may include a plurality of heat exchange tubes 216. In 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 to form two refrigerant paths, which flow out of the second refrigerant flow path 2152 through the two outlets, respectively.

[0367] Specifically, the refrigerant entering the second refrigerant flow path 2152 from the inlet passes through different numbers of heat exchange tubes 216 and is then split into two paths by a claw-shaped tee, which can handle different pressure drops. Specifically, when the pressure drop exceeds 300 kPa, the refrigerant entering the second refrigerant flow path 2152 from the inlet can pass through one heat exchange tube 216 and then be split into two paths by a claw-shaped tee, thereby reducing the larger pressure drop. When the pressure drop reaches below 300 kPa, 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 into two paths by a claw-shaped tee.

[0368] refer to Figure 39 In some embodiments of the present application, in the width direction of the machine body, a first gap L8 is defined 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 .

[0369] 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 onto the cross-flow fan 31 under the action of gravity, by setting a first gap between the third-section 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.

[0370] In some embodiments, there is no overlapping area between the downward projection of the third-stage heat exchanger 214 and the downward projection of the cross-flow fan 31 in the vertical direction.

[0371] The duct air conditioner provided in this embodiment ensures that in the cooling mode, the 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 vertical downward projection of the third-section heat exchanger 214 and the cross-flow fan 31 to have no overlapping area, thereby effectively preventing the water blowing problem and improving the user experience.

[0372] In some embodiments of the present application, an acute angle is formed between the third stage heat exchanger 214 and the top plate. in,

[0373] refer to Figure 40 , acute angle The opening faces the air inlet of the air conditioner.

[0374] acute angle It cannot be too small, because if it is too small, the vertical area of ​​the third section heat exchanger 214 facing the wind 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 angle is set to be no less than the first parameter value. For example, the first parameter value can be 10°, 13°, or 15°. Consider selecting a suitable specific parameter during the specific design.

[0375] acute 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 position of 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 vortex area 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 can be 30°, 27°, or 25°. Consider selecting an appropriate and specific parameter during the specific design.

[0376] In some embodiments of the present application, an acute angle is formed between the third stage heat exchanger 214 and the top plate. in,

[0377] In this embodiment, by Make reasonable settings to make it sharp The angle is set to any value between 10° and 30°, which can increase the discharge speed of the condensed water on the first stage heat exchanger 212 while ensuring the air intake, and improve the heat exchange capacity of the third stage heat exchanger 214.

[0378] In some embodiments of the present application, an acute angle is formed between the second stage heat exchanger 213 and the bottom plate. in,

[0379] Continue to refer Figure 40 , acute angle The opening faces the air inlet of the air conditioner.

[0380] acute 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 stage heat exchanger 213 to the water receiving pan. Instead, it will flow down to the first stage heat exchanger 212 and then drip onto the water receiving pan, resulting in poor heat exchange of the first stage heat exchanger 212 under cooling. In order to improve the heat exchange capacity of the first stage heat exchanger 212, the acute angle The angle is set to be no less than the third parameter value. For example, the third parameter value can be 40°, 43°, or 45°. Consider selecting an appropriate and specific parameter during the specific design.

[0381] acute angle It cannot be too large, because if it is too large, the second section heat exchanger 213 will be almost vertical, affecting the angles of other sections of the heat exchanger. At the same time, since the second section heat exchanger 213 occupies most of the vertical windward area, it will cause the first section heat exchanger 212 and the third section heat exchanger 214 to be unevenly distributed, 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 can be 80°, 78°, or 75°. Consider selecting an appropriate and specific parameter during the specific design.

[0382] In some embodiments of the present application, an acute angle is formed between the second stage heat exchanger 213 and the bottom plate. in,

[0383] 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-stage heat exchanger 213 can drip directly into the water receiving tray, avoiding accumulation on the first-stage heat exchanger 212, while improving the heat exchange capacity of the first-stage heat exchanger 212 and the entire indoor heat exchanger 21, avoiding increasing the height of the body.

[0384] In some embodiments of the present application, an acute angle is formed between the first stage heat exchanger 212 and the bottom plate. in,

[0385] Continue to refer Figure 40 , acute angle The opening faces the air inlet of the air conditioner.

[0386] acute angle Cannot be too small, even if the upper part of the condensed water is discharged from the second fold heat exchanger to the lower part, too small an acute angle This will cause the remaining condensed water to be discharged too slowly, which will still lead to poor heat exchange performance in the third stage heat exchanger 214. The distance between the indoor heat exchanger 21 and the water tray will be too small, resulting in low air flow at the bottom, poor diversion of the entire indoor heat exchanger 21, or increased height of the machine body. The angle is set to be no less than the fifth parameter value. For example, the fifth parameter value can be 15°, 17°, or 19°. Consider selecting an appropriate parameter during the specific design.

[0387] acute angle It cannot be too large, otherwise the first section heat exchanger 212 will occupy a higher proportion of the entire body, making it difficult to position the remaining sections of the heat exchanger at a reasonable angle. In order to avoid increasing the height of the body, the indoor heat exchanger 21 should be arranged reasonably to reduce the sharp angle. The angle is set to be no greater than the sixth parameter value. For example, the sixth parameter value can be 28°, 28°, or 25°. Consider selecting an appropriate and specific parameter during the specific design.

[0388] In some embodiments of the present application, an acute angle is formed between the first stage heat exchanger 212 and the bottom plate. in,

[0389] In this embodiment, by Reasonable setting can be made so that it can be any angle of 15° to 20°, and on the basis of avoiding increasing the height of the whole machine, the heat exchange capacity of the first section heat exchanger 212 is improved, 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.

[0390] In some embodiments of the present application, the ducted air conditioner further includes a water receiving tray, which is disposed inside the air conditioner body and below the indoor heat exchanger 21 .

[0391] A second gap is defined between the first heat exchanger 212 and the bottom wall of the water tray to increase the airflow into the lower portion of the first heat exchanger 212. It will be appreciated that the second gap can be appropriately configured based on the height of the machine body, thereby increasing the airflow into the first heat exchanger 212 while minimizing the machine body's height.

[0392] 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.

[0393] Specifically, after the first and second heat exchangers 212 and 213 are completely cut apart at their junction, they are connected at a first predetermined angle. This angle of the first heat exchanger 212 is not restricted by the structure, while allowing the fins of the two heat exchangers to contact a sufficient area, thereby allowing condensed water to flow to the bottom more easily at this first predetermined angle.

[0394] In some embodiments of the present application, the first heat exchanger 212 and the second heat exchanger 213 are integrated into one 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.

[0395] refer to Figures 41 to 43 In some embodiments of the present application, the indoor heat exchanger 21 has multiple refrigerant flow paths 215, and the refrigerant flow paths 215 have an inlet and an outlet.

[0396] 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 cooling mode, the refrigerant in the inlet pipe assembly 8 is injected into the corresponding refrigerant flow paths 215 through different inlets, and the refrigerant in the refrigerant flow paths 215 flows out through the corresponding outlets.

[0397] In this embodiment, reference Figure 41 , the refrigerant flow path relatively close to the bottom plate among the multiple refrigerant flow paths 215 is defined as the first refrigerant flow path 2151. The inlet of the first refrigerant flow path 2151 is defined as the first inlet, and the outlet of the first refrigerant flow path 2151 is defined as the first outlet. In other words, in this embodiment, the first refrigerant flow path 2151 is a refrigerant flow path with a single inlet and a single outlet.

[0398] refer to Figure 43 The duct unit may include a solenoid valve 9. The solenoid valve 9 is connected between the inlet pipe assembly 8 and the first inlet.

[0399] 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.

[0400] 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.

[0401] Specifically, in cooling mode, solenoid valve 9 is slightly open, and the refrigerant in inlet pipe assembly 8 enters first refrigerant flow path 2151 through the first inlet and flows out of first refrigerant flow path 2151 through the first outlet. In heating mode, solenoid valve 9 is fully open, and the refrigerant in first refrigerant flow path 2151 flows out through the first inlet and flows into inlet pipe assembly 8 through solenoid valve 9.

[0402] 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 and heating capabilities can be fully utilized.

[0403] 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, and therefore the supercooling is better, which effectively balances the cooling and heating capabilities of the duct air conditioner, so that the cooling and heating diversion reaches a better state.

[0404] In some embodiments of the present application, the ducted air conditioner may include an inlet pipe assembly 8 connected to the inlets of multiple refrigerant flow paths to inject refrigerant into the refrigerant flow paths through the inlets in cooling mode. The ducted air conditioner may also include a solenoid valve 9. Solenoid valve 9 is connected between the inlet pipe assembly 8 and the first inlet to control the flow of refrigerant into the first refrigerant flow path 2151.

[0405] Specifically, the opening 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 of the solenoid valve 9 in the heating mode is the maximum opening.

[0406] The ducted air conditioner provided in this embodiment utilizes a solenoid valve 9 connected between the inlet pipe assembly 8 and the first inlet of the first refrigerant flow path 2151, thereby ensuring that the refrigerant flow rate of the first refrigerant flow path 2151 in cooling mode is less than that in heating mode. This means that in cooling mode, the first refrigerant flow path 2151 is throttled to reduce its refrigerant flow rate, thereby increasing its diverted superheat. In heating mode, the solenoid valve 9 is fully opened, and the first refrigerant flow path 2151 is not significantly overcooled by the throttling, thus preventing its heating capacity from being affected. This ensures that the ducted air conditioner's cooling and heating capabilities are balanced.

[0407] In some embodiments of the present application, the solenoid valve 9 is a two-position normally open solenoid valve 9 .

[0408] Specifically, during cooling mode, the two-position normally open solenoid valve 9 is energized and slightly actuated, resulting in a low refrigerant flow rate through the first refrigerant flow path 2151 and a high degree of superheat. During heating mode, the two-position normally open solenoid valve 9 is de-energized and fully open, allowing for better heat exchange in the first refrigerant flow path 2151 during heating, resulting in a high degree of supercooling. This balances the air conditioner's cooling and heating capacities.

[0409] 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 and heating capabilities can be fully utilized. The two-position normally open solenoid valve 9 is simple to operate and easy to control.

[0410] In some embodiments of the present application, the indoor heat exchanger 21 includes at least two sections of heat exchangers, which are sequentially connected from top to bottom to form a semi-enclosed structure. The semi-enclosed structure has an opening toward the crossflow fan 31, allowing the indoor heat exchanger 21 to partially surround the crossflow fan 31, thereby improving the heat exchange capacity of the indoor heat exchanger 21.

[0411] 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 its first outlet and first inlet are formed on the first heat exchanger 212 .

[0412] 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.

[0413] 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.

[0414] In some embodiments of the present application, the first stage heat exchanger 212 includes a plurality of heat exchange tubes 216 , which are arranged in two rows: an inner row close to the cross-flow fan 31 and an outer row away from the cross-flow fan 31 .

[0415] refer to Figure 42 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 is 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.

[0416] 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.

[0417] 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 parallel refrigerant flow paths 215. 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 similar and each refrigerant flow path 215 has the same pressure drop.

[0418] In some embodiments of the present application, reference is made to Figure 29 The inlet pipe assembly 8 may include a diverter 84. The diverter 84 has a diverter inlet and a plurality of diverter outlets, and the plurality of refrigerant flow paths 215 are connected to different diverter outlets.

[0419] The inlet pipe assembly 8 may include an inlet pipe 85. The inlet pipe 85 is connected to the diverter inlet. In cooling mode, the refrigerant enters the diverter 84 through the inlet pipe 85, is diverted within the diverter 84, and is injected into the multiple refrigerant flow paths 215 through the multiple diverter outlets.

[0420] The ducted air conditioner may include an outlet pipe assembly 11. The outlet pipe assembly 11 is connected to the outlets of multiple refrigerant flow paths 215. In cooling mode, refrigerant flows into the multiple refrigerant flow paths 215 via the inlet pipe assembly 8. The refrigerant in the multiple refrigerant flow paths 215 is collected in the outlet pipe assembly 11 and flows out through the outlet pipe assembly 11.

[0421] 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.

[0422] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0423] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A multi-split air conditioning system, characterized in that: include: an outdoor unit including a compressor; A plurality of indoor units connected in parallel are connected to the outdoor unit; wherein, when the multi-split air-conditioning system is heating, some of the plurality of indoor units are in a heating operation mode, and the other indoor units that are not turned on are defined as target indoor units; The indoor unit comprises: A machine body, wherein the machine body is provided with an air-conditioning air inlet and an air-conditioning air outlet; An indoor heat exchanger is disposed in the machine body and close to the air inlet of the air conditioner; a cross-flow fan disposed within the housing and between the indoor heat exchanger and the air-conditioning outlet, wherein indoor air enters the housing through the air-conditioning inlet under the action of the cross-flow fan, exchanges heat in the indoor heat exchanger, and is output to the room through the air-conditioning outlet; Ambient temperature sensor, used to detect indoor ambient temperature to provide a base for subsequent temperature compensation; A coil temperature detection device is provided on the indoor heat exchanger to detect the temperature of the inner coil; A controller is electrically connected to the outdoor unit and the indoor unit, and is configured to: After the target indoor unit receives the heating command, determining whether the target indoor unit meets a preset compensation condition; wherein, if 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, controlling to sample the current inner coil temperature; if the sampled inner coil temperature reaches or exceeds a preset temperature, and the air outlet of the air conditioner of the target indoor unit is not provided with an air guide plate, determining that the preset compensation condition is met; If yes, then a temperature compensation value T1 is obtained by a first logic operation according to the operating frequency F of the compressor and the internal coil temperature of the target indoor unit; the first logic operation is set to: ; Wherein, d and e are correction coefficients and d is a negative value and e is a positive value, and Tin is the sampled inner coil temperature; The indoor ambient temperature is compensated according to the temperature compensation value T1 to obtain a compensated indoor ambient temperature, and the target indoor unit is controlled to enter a heating operation mode according to the compensated indoor ambient temperature; wherein the compensated indoor ambient temperature = the indoor ambient temperature detected by the ambient temperature sensor - the temperature compensation value T1.

2. A multi-split air conditioning system, characterized in that: include: an outdoor unit including a compressor; A plurality of indoor units connected in parallel are connected to the outdoor unit; wherein, when the multi-split air-conditioning system is heating, some of the plurality of indoor units are in a heating operation mode, and the other indoor units that are not turned on are defined as target indoor units; The indoor unit comprises: A housing having an accommodating cavity formed therein, the housing comprising a rear panel and a front panel disposed opposite to each other along its width direction, the rear panel and the front panel respectively being provided with an air-conditioning inlet and an air-conditioning outlet communicating with the accommodating cavity; An indoor heat exchanger is arranged in the accommodating cavity and close to the air inlet of the air conditioner; a cross-flow fan disposed in the accommodating cavity and between the indoor heat exchanger and the air-conditioning outlet; under the action of the cross-flow fan, indoor air enters the accommodating cavity through the air-conditioning inlet, and is output to the room through the air-conditioning outlet after being heated by the indoor heat exchanger; an end plate, located in the accommodating cavity and connected to one end of the indoor heat exchanger in the longitudinal direction; An ambient temperature sensor is provided on the end plate or on the side of the rear panel away from the accommodating cavity, for detecting the indoor ambient temperature to provide a basis for subsequent temperature compensation; A coil temperature detection device is provided on the indoor heat exchanger to detect the temperature of the inner coil; A controller is electrically connected to the outdoor unit and the indoor unit, and is configured to: After the target indoor unit receives the heating command, determining whether the target indoor unit meets a preset compensation condition; wherein, if 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, controlling to sample the current inner coil temperature; if the sampled inner coil temperature reaches or exceeds a preset temperature, and the air outlet of the air conditioner of the target indoor unit is not provided with an air guide plate, determining that the preset compensation condition is met; If yes, then a temperature compensation value T1 is obtained by a first logic operation according to the operating frequency F of the compressor and the internal coil temperature of the target indoor unit; the first logic operation is set to: ; Wherein, d and e are correction coefficients and d is a negative value and e is a positive value, and Tin is the sampled inner coil temperature; The indoor ambient temperature is compensated according to the temperature compensation value T1 to obtain a compensated indoor ambient temperature, and the target indoor unit is controlled to enter a heating operation mode according to the compensated indoor ambient temperature; wherein the compensated indoor ambient temperature = the indoor ambient temperature detected by the ambient temperature sensor - the temperature compensation value T1.

3. The multi-split air conditioning system according to claim 1 or 2, characterized in that: The controller is further configured to: After the target indoor unit receives the heating instruction, determining whether the target indoor unit includes an electronic expansion valve; If yes, then obtain the working state of the electronic expansion valve, wherein the working state includes closed state and open state; 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.

4. The multi-split air conditioning system according to claim 1 or 2, characterized in that: 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: Determining whether the temperature of the inner coil reaches or exceeds a preset temperature; If not, control sampling the current indoor ambient temperature, and control the target indoor unit to enter a heating operation mode according to the sampled indoor ambient temperature; If so, determine whether there is an air guide plate at the air-conditioning outlet of the target indoor unit.

5. The multi-split air conditioning system according to claim 4, characterized in that: The controller is further configured to: If the target indoor unit has the air deflector, controlling the air deflector to move to an open position; The cross-flow fan is controlled to operate at a first speed, and after a preset time, the current indoor ambient temperature is sampled, and the target indoor unit is controlled to enter a heating operation mode according to the sampled indoor ambient temperature.

6. The multi-split air conditioning system according to claim 5, characterized in that: The first rotational speed is lower than the rotational speed corresponding to the low wind speed gear of the cross-flow fan, and / or the air guide plate in the open position guides the air flow blown out of the air-conditioning outlet upward.

7. The multi-split air conditioning system according to claim 4, characterized in that: The controller is further configured to: if the target indoor unit does not have the air guide plate, determine that the target indoor unit meets a preset compensation condition.

8. The multi-split air conditioning system according to claim 2, characterized in that: The indoor unit further includes a sensor bracket, wherein the sensor bracket is formed with a mounting portion for embedding the ambient temperature sensor, and the sensor bracket is fixed to the end plate or the rear panel.

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