Multi-split air conditioning system

Abstract

The invention discloses a multi-split air conditioning system which comprises an outdoor unit. An indoor unit; a floor heating unit; a water module; the dehumidification module comprises a shell, and an air inlet and an air outlet are formed in the shell; an air duct is arranged in the shell, and a dehumidification heat exchanger is arranged in the air duct and connected with the outdoor unit. A fresh air inlet of the total heat exchanger communicates with the outdoor space, a fresh air outlet of the total heat exchanger communicates with an air inlet of the dehumidification module, a dirty air inlet of the total heat exchanger communicates with the indoor space, and a dirty air outlet of the total heat exchanger communicates with the outdoor space; the control module is configured to start the total heat exchanger when an instruction for starting the fresh air function is received; when an instruction for starting the fresh air dehumidification function is received, the total heat exchanger and the dehumidification module are started; and when an instruction for starting the non-cooling dehumidification function is received, the total heat exchanger, the dehumidification module and the water module are started. The system has the floor heating function, the fresh air function, the fresh air dehumidification function and the non-cooling dehumidification function, the functions are rich, heat recovery can be carried out, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly to a multi-split air conditioning system. BACKGROUND

[0002] With the increasing demand for the quality of home environment, people hope that the household air conditioning system has the functions of fresh air, refrigeration, heating, dehumidification and floor heating, and the air conditioning system can be flexibly integrated into the intelligent home control system.

[0003] However, at present, most air conditioning equipment in the industry has single function and cannot simultaneously have the functions of fresh air, refrigeration, heating, dehumidification and floor heating, which cannot meet the diversified functional requirements of high-end users on central air conditioning. When these functions are realized, most scheme manufacturers install multiple sets of air conditioning systems, which leads to high cost and large space occupation, cannot effectively solve the user's pain points at low cost, and is difficult to provide satisfactory solutions for users. The reason is that a reasonable solution that can exceed the user's expectations in cost has not been found. SUMMARY

[0004] The present application provides a multi-split air conditioning system, which solves the technical problem of single function in the prior art.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] The present application provides a multi-split air conditioning system, which includes:

[0007] An outdoor unit;

[0008] An indoor unit group including a plurality of parallel indoor units;

[0009] A floor heating unit group including a plurality of parallel floor heating coils;

[0010] A water module connected to the outdoor unit through a refrigerant pipeline and connected to the floor heating unit group through a water pipeline;

[0011] Further comprising:

[0012] A dehumidification module including a shell having an air inlet and an air outlet; the shell has an air duct communicating with the air inlet and the air outlet, and a dehumidification heat exchanger is arranged in the air duct; the dehumidification heat exchanger is connected to the outdoor unit through a refrigerant pipeline;

[0013] A total heat exchanger having a fresh air inlet, a fresh air outlet, a dirty air inlet and a dirty air outlet; the fresh air inlet is communicated with an outdoor space, the fresh air outlet is communicated with the air inlet of the dehumidification module, the dirty air inlet is communicated with an indoor space, and the dirty air outlet is communicated with the outdoor space;

[0014] a control module configured to:

[0015] start the total heat exchanger when receiving an instruction to start the fresh air function;

[0016] start the total heat exchanger and the dehumidification module when receiving an instruction to start the fresh air dehumidification function;

[0017] start the total heat exchanger, the dehumidification module and the water module when receiving an instruction to start the non-cooling dehumidification function.

[0018] In some embodiments of the present application, the control module is further configured to:

[0019] start the total heat exchanger first when receiving an instruction to start the fresh air dehumidification function, and then start the dehumidification module when detecting that the humidity at the air outlet of the dehumidification module is higher than the set humidity.

[0020] In some embodiments of the present application, the air duct of the dehumidification module is provided with an auxiliary heating device;

[0021] The control module is further configured to:

[0022] start the total heat exchanger first when receiving an instruction to start the fresh air function or the fresh air dehumidification function, and then start the auxiliary heating device when detecting that the temperature at the air outlet of the dehumidification module is lower than the set temperature.

[0023] In some embodiments of the present application, the air duct of the dehumidification module is provided with an auxiliary heating device;

[0024] The control module is further configured to:

[0025] start the total heat exchanger first when receiving an instruction to start the non-cooling dehumidification function, and then start the dehumidification module and the water module when detecting that the humidity at the air outlet of the dehumidification module is higher than the set humidity.

[0026] After the water module is started for a first set duration, detect the indoor temperature, and start the auxiliary heating device when the indoor temperature is lower than the set temperature.

[0027] In some embodiments of the present application, the outdoor unit, the indoor unit, the dehumidification module, the control module and the drive-by-wire controller for controlling the indoor unit are all connected to the HomeBus bus.

[0028] In some embodiments of the present application, the control module is further configured to:

[0029] send a handshake request to the total heat exchanger; if a handshake response from the total heat exchanger is received within a second set duration, the handshake connection is successful, and the control phase is entered; otherwise, the handshake connection fails, and an alarm prompt is given;

[0030] In the control stage, when receiving a new air instruction of the user, the new air instruction is sent to the total heat exchanger; when not receiving the new air instruction of the user, the total heat exchanger is communicated in a timing mode; if a timing communication response of the total heat exchanger is not received within a third set time length, it is determined that the total heat exchanger is offline, and an alarm prompt is performed.

[0031] In some embodiments of the application, the control module is further configured to:

[0032] A handshake request is sent to the dehumidification module; if a handshake response of the dehumidification module is received within a fourth set time length, the handshake connection is successful, and the control stage is entered; otherwise, the handshake connection fails, and an alarm prompt is performed;

[0033] In the control stage, when receiving a dehumidification instruction of the user, the dehumidification instruction is sent to the dehumidification module; when not receiving the dehumidification instruction of the user, the dehumidification module is communicated in a timing mode; if a timing communication response of the dehumidification module is not received within a fifth set time length, it is determined that the dehumidification module is offline, and an alarm prompt is performed.

[0034] In some embodiments of the application, the drive-by-wire controller is configured to:

[0035] A handshake request is sent to the indoor unit; if a handshake response of the indoor unit is received within a sixth set time length, the handshake connection is successful, and the control stage is entered; otherwise, the handshake connection fails, and an alarm prompt is performed;

[0036] In the control stage, when receiving an operation instruction of the user, a control instruction is sent to the indoor unit; when not receiving the operation instruction of the user, the indoor unit is communicated in a timing mode; if a timing communication response of the indoor unit is not received within a seventh set time length, it is determined that the indoor unit is offline, and an alarm prompt is performed.

[0037] In some embodiments of the application, the multi-split air conditioning system further comprises:

[0038] A Modbus protocol converter is used for bidirectional conversion between a HomeBus protocol and a Modbus protocol; the Modbus protocol converter has a HomeBus communication interface and is connected with the HomeBus bus; the Modbus protocol converter has a Modbus communication interface and is used for connection with the intelligent control device.

[0039] In some embodiments of the application, the Modbus protocol converter is configured to:

[0040] The handshake connection instruction is sent to the HomeBus bus, the number and type of devices on the HomeBus bus are confirmed according to the received handshake response, the state request instruction is sent to the devices on the HomeBus bus one by one, and the running state information fed back is received, and after collecting the running state information of all devices, the control phase is entered.

[0041] In the control phase, the received control instruction is converted into a control instruction of the HomeBus protocol, and is sent to the corresponding device through the HomeBus bus.

[0042] The technical scheme of the application has the following technical effects relative to the prior art: the multi-connected air conditioning system of the application, by designing the total heat exchanger, makes the outdoor fresh air exchange heat with the indoor dirty air through the total heat exchanger, realizes heat recovery, and improves the fresh air temperature; by designing the dehumidification module, the fresh air flowing out of the total heat exchanger is dehumidified, and the fresh air dehumidification function is realized; by designing the water module, not only the floor heating function is realized, but also the outdoor heat exchanger is condensed and heat recovered when dehumidifying, the non-cooling dehumidification function is realized, the user comfort is improved, and energy is saved. Therefore, the multi-connected air conditioning system of the application not only has rich functions, such as the floor heating function, the fresh air function, the fresh air dehumidification function, and the non-cooling dehumidification function, but also can recover heat when dehumidifying, reduces the user cost, and solves the technical problem of single function in the prior art.

[0043] Other features and advantages of the application will become more apparent after reading the specific embodiments of the application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0045] Figure 1 The structural schematic diagram of one embodiment of the multi-connected air conditioning system of the application;

[0046] Figure 2 The connection schematic diagram of the total heat exchanger and the dehumidification module;

[0047] Figure 3 The flowchart of one embodiment of the steps executed by the control module;

[0048] Figure 4 The flowchart of another embodiment of the steps executed by the control module;

[0049] Figure 5Flow chart of another embodiment of steps performed by the control module;

[0050] Figure 6 Flow chart of another embodiment of steps performed by the control module;

[0051] Figure 7 Flow chart of another embodiment of steps performed by the control module;

[0052] Figure 8 Flow chart of another embodiment of steps performed by the control module;

[0053] Figure 9 Flow chart of another embodiment of steps performed by the control module;

[0054] Figure 10 Flow chart of an embodiment of steps performed by the drive-by-wire controller;

[0055] Figure 11 Flow chart of another embodiment of steps performed by the drive-by-wire controller.

[0056] Reference signs:

[0057] 10, total heat exchanger;

[0058] 11, housing; 11-1, fresh air inlet; 11-2, fresh air outlet; 11-3, dirty air inlet; 11-4, dirty air outlet;

[0059] 12, filter core; 13, heat exchange core; 14, fresh air fan; 15, exhaust air fan;

[0060] 20, dehumidification module;

[0061] 21, housing; 21-1, air inlet; 21-2, air outlet; 21-3, air duct;

[0062] 22, dehumidification heat exchanger; 23, auxiliary heating device; 24, temperature sensor; 25, humidity sensor;

[0063] 26, connecting air duct. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present application.

[0065] In the description of the application, it needs to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or position shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0066] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified and limited, the meaning of "a plurality of" is two or more.

[0067] In the description of the application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0068] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0069] The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the application. In addition, the application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0070] An air conditioner performs a refrigeration cycle and a heating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator, and controls a flow direction of refrigerant and an opening degree of the expansion valve, etc. by a controller. The refrigeration cycle and the heating cycle include a series of processes involving compression, condensation, expansion, and evaporation, and supply the refrigerant to the air that has been adjusted and heat-exchanged.

[0071] The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0072] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by heat-exchanging with a material to be cooled using latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature of an indoor space.

[0073] An air conditioner outdoor unit refers to a portion of the refrigeration cycle including the compressor and the outdoor heat exchanger, and an air conditioner indoor unit includes the indoor heat exchanger, and the expansion valve can be provided in the air conditioner outdoor unit or the indoor unit.

[0074] The indoor heat exchanger and the outdoor heat exchanger are used as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0075] The multi-split air conditioning system of the present embodiment includes an outdoor unit, an indoor unit group, a floor heating unit group, a water module, a dehumidification module, a total heat exchanger, a control module, etc., as shown in Figure 1 .

[0076] The outdoor unit has a compressor, a four-way valve, an outdoor heat exchanger, an outdoor fan, etc.

[0077] The indoor unit group includes a plurality of indoor units connected in parallel. Each indoor unit is connected to the outdoor unit. Each indoor unit includes an indoor heat exchanger, an indoor fan, etc. An electronic expansion valve is provided on a liquid pipe of the indoor heat exchanger to control throttling of the refrigerant line.

[0078] The floor heating unit group includes a plurality of floor heating coils connected in parallel. A water valve is provided at a water inlet of each floor heating coil to control the on-off of water inlet. The water valve is controlled by the outdoor unit circuit board to turn on or off.

[0079] The water module is connected with the outdoor heat exchanger of the outdoor unit through a refrigerant pipeline and connected with the floor heating unit through a water pipeline. The water module has a shell, the shell has a refrigerant inlet, a refrigerant outlet, a water inlet and a water outlet, the shell has a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is used for connecting the refrigerant inlet and the refrigerant outlet, the second heat exchange pipeline is used for connecting the water inlet and the water outlet, the refrigerant inlet and the refrigerant outlet are connected with the refrigerant pipeline, and the water inlet and the water outlet are connected with the water pipeline (a return water pipeline and a water supply pipeline). The refrigerant in the first heat exchange pipeline exchanges heat with the water in the second heat exchange pipeline, after heat exchange, the refrigerant in the first heat exchange pipeline flows to the outdoor heat exchanger through the refrigerant pipeline, and the water in the second heat exchange pipeline enters the floor heating coil through the water pipeline.

[0080] The water module is built in the outdoor unit, and the first heat exchange pipeline of the water module is connected with the outdoor heat exchanger in series. The water module exchanges heat with the refrigerant system on the side of the outdoor unit to provide heat for the water route floor heating coil.

[0081] The dehumidification module 20 includes a shell 21, the shell 21 has an air inlet 21-1 and an air outlet 21-2, the shell 20 has an air duct 21-3 connected with the air inlet and the air outlet, and a dehumidification heat exchanger 22 is arranged in the air duct 21-3, as shown in Figure 2 The dehumidification heat exchanger 22 is connected with the outdoor unit through a refrigerant pipeline. An electronic expansion valve is arranged on the liquid pipe of the dehumidification heat exchanger 22 to control the refrigerant pipeline. The air inlet 21-1 is connected with the fresh air outlet 11-2 of the total heat exchanger 10, and the air in the air duct 21-3 is dehumidified by the dehumidification heat exchanger 22 and then discharged to the indoor space through the air outlet 21-2.

[0082] The dehumidification module 20 is installed indoors and can be regarded as an indoor unit without a fan assembly but retaining a heat exchanger and an electrical control part. The refrigerant pipeline of the dehumidification module 20 is connected in parallel with the refrigerant pipelines of the indoor units.

[0083] The total heat exchanger 10 includes a shell 11 and a heat exchange core 13 arranged in the shell 11, the shell 11 has a fresh air inlet 11-1, a fresh air outlet 11-2, a dirty air inlet 11-3 and a dirty air outlet 11-4. A fresh air fan 14 is arranged at the fresh air outlet 11-2, and an exhaust air fan 15 is arranged at the dirty air outlet 11-4. A filter element 12 is arranged at the fresh air inlet 11-1 and used for filtering pollutants. The heat exchange core 13 has a fresh air channel and a dirty air duct.

[0084] One end of the fresh air channel is connected with the fresh air inlet 11-1, and the fresh air inlet 11-1 is connected with an outdoor space. The other end of the fresh air channel is connected with the fresh air outlet 11-2, and the fresh air outlet 11-2 is connected with the air inlet 21-1 of the dehumidification module 20 through a connecting air duct 26.

[0085] One end of the dirty air duct is in communication with a dirty air inlet 11-3, and the dirty air inlet 11-3 is in communication with the indoor space. The other end of the dirty air duct is in communication with a dirty air outlet 11-4, and the dirty air outlet 11-4 is in communication with the outdoor space.

[0086] The fresh air in the fresh air channel exchanges heat with the dirty air in the dirty air duct to recover the heat of the dirty air.

[0087] The total heat exchanger is a standard function fresh air exchange device, which can realize air exchange between the indoor and outdoor alone. The total heat exchanger 10 is connected with the dehumidification module 20 through a short distance air duct (connection air duct 26) to form a "total heat exchanger + dehumidification module" two-in-one module, and the two-in-one module forms the necessary components for heat exchange and air supply after combination. The two-in-one module can operate the fresh air function alone, or can operate the fresh air and dehumidification functions simultaneously to realize the fresh air dehumidification effect.

[0088] The total heat exchanger and the dehumidification module can form an all-in-one machine, or can be independently arranged and connected together during installation. The total heat exchanger and the dehumidification module are connected together to form a "total heat exchanger + dehumidification module" two-in-one module. The outdoor fresh air exchanges heat with the indoor dirty air through the total heat exchanger, and then dehumidifies through the dehumidification module before flowing into the indoor space.

[0089] The indoor unit and the corresponding floor heating coil are installed in the same room, and the dehumidification module and the corresponding floor heating coil are installed in the same room. For example, each bedroom of a family is provided with a floor heating coil, an indoor unit, and a line controller for controlling the floor heating coil, the indoor unit, and the outdoor unit; the living room is provided with a floor heating coil, a dehumidification module, and a control module (also a line controller) for controlling the floor heating coil, the dehumidification module, the total heat exchanger, and the outdoor unit.

[0090] The control module is configured to:

[0091] start the total heat exchanger when receiving an instruction to start the fresh air function;

[0092] start the total heat exchanger and the dehumidification module when receiving an instruction to start the fresh air dehumidification function;

[0093] start the total heat exchanger, the dehumidification module, and the water module when receiving an instruction to start the dehumidification function without temperature reduction.

[0094] Of course, if the dehumidification module or the water module is started, the outdoor unit must be started to circulate the refrigerant.

[0095] The heat exchanger is activated, and fresh air blower 14 and exhaust fan 15 are running. Fresh air from outside is drawn into the room by fresh air blower 14 through the heat exchanger and dehumidification module. Exhaust fan 15 removes polluted air from the room through the heat exchanger and exhausts it outdoors, creating a fresh air environment.

[0096] The dehumidification module is activated, the electronic expansion valve on the liquid pipe of dehumidification heat exchanger 22 is opened, and the outdoor unit is started. The high-temperature, high-pressure refrigerant discharged from the compressor first flows to the outdoor heat exchanger, exchanges heat with the outdoor heat exchanger, and then flows to the dehumidification heat exchanger 22 of the dehumidification module. The low-temperature liquid refrigerant in dehumidification heat exchanger 22 exchanges heat with the air in air duct 21-3. The air in air duct 21-3 is dehumidified by dehumidification heat exchanger 22 and discharged into the indoor space. The refrigerant in dehumidification heat exchanger 22 then flows back to the compressor.

[0097] Start the water module, open the water valve of the floor heating coil in the same room as the dehumidification module, start the outdoor unit, and the hot water provided by the water module enters the corresponding floor heating coil through the water supply pipe.

[0098] The airflow blown into the room through the dehumidification module will cause the indoor temperature to drop. Therefore, when dehumidification is not performed, the water module needs to be started to recover heat from the condensation process of the outdoor unit and provide circulating hot water for the floor heating coil, which will compensate for the indoor temperature.

[0099] Therefore, when dehumidification is not in progress, the water module is started, and heat is exchanged between the refrigerant and the water in the water module to recover the heat taken away from the room by the dehumidification module. The recovered heat is supplied to the floor heating coil through the water channel to achieve the effect of "condensation heat recovery". The control function of condensation heat recovery will greatly improve the comfort of the human body during dehumidification when it is running in the transition season, and will not consume additional electricity, which has an energy-saving effect.

[0100] Through the control of the control module, the "full heat exchanger + dehumidification module" two-in-one module can be used as a fresh air fan alone, or it can realize the "fresh air dehumidification function" through linkage control, and then cooperate with the water module to realize the "non-cooling dehumidification function".

[0101] When the two-in-one module is used alone as a fresh air fan, the dehumidification module does not operate, and only the full heat exchanger operates. The control module sends a fresh air instruction to the full heat exchanger, and the fan of the full heat exchanger runs. The filter element 12 inside the full heat exchanger filters the pollutants and moisture in the outdoor fresh air, and then exchanges heat with the polluted air discharged from the room before sending it into the room.

[0102] When the two-in-one module operates the fresh air dehumidification function, the control module sends a dehumidification instruction to the dehumidification module and a fresh air instruction to the total heat exchanger, and the dehumidification module and the total heat exchanger operate simultaneously, the total heat exchanger is responsible for introducing fresh air into the room, and the dehumidification module is responsible for condensing the moisture in the outdoor air and discharging it, thereby simultaneously realizing the effects of fresh air and dehumidification.

[0103] When the non-cooling dehumidification function needs to be realized, the control module sends a dehumidification instruction to the dehumidification module, a fresh air instruction to the total heat exchanger, and a non-cooling dehumidification instruction to the water module, starts the water module, and recovers the condensation heat of the outdoor unit through heat exchange between the refrigerant and the water to supply the recovered heat to the floor heating coil.

[0104] The multi-split air conditioning system of the embodiment realizes heat recovery by designing the total heat exchanger to make the outdoor fresh air exchange heat with the indoor dirty air through the total heat exchanger, and improves the fresh air temperature; realizes the fresh air dehumidification function by designing the dehumidification module to dehumidify the fresh air flowing out of the total heat exchanger; realizes the non-cooling dehumidification function by designing the water module to not only realize the floor heating function but also recover the condensation heat of the outdoor heat exchanger during dehumidification, improves the user comfort, and saves energy. Therefore, the multi-split air conditioning system of the embodiment not only has rich functions, such as the floor heating function, the fresh air function, the fresh air dehumidification function, and the non-cooling dehumidification function, but also recovers heat during dehumidification, reduces the user cost, and solves the technical problem of single function in the prior art.

[0105] In some embodiments of the application, the control module is further configured to: when receiving an instruction to start the fresh air dehumidification function, first start the total heat exchanger, and then start the dehumidification module when detecting that the humidity at the air outlet of the dehumidification module is higher than the set humidity.

[0106] A humidity sensor 25 is arranged at the air outlet 21-2 of the dehumidification module, which is used to detect the humidity at the air outlet 21-2 and send the detected humidity value to the control module.

[0107] When the user sets the "fresh air dehumidification" function on the control module, the user can also set the indoor humidity value, i.e., the set humidity. When the humidity value detected by the humidity sensor is greater than the set humidity set by the user, the dehumidification module will actually start the dehumidification function, and the dehumidification heat exchanger will condense and dehumidify the introduced fresh air; when the humidity value detected by the humidity sensor is not greater than the set humidity set by the user, the dehumidification module will not start the dehumidification function, thereby achieving the energy-saving effect.

[0108] The control module specifically performs the following steps, which are shown in Figure 3 .

[0109] Step S11: When receiving an instruction to start the fresh air dehumidification function, start the total heat exchanger.

[0110] Step S12: detecting the humidity at the air outlet of the dehumidification module.

[0111] Step S13: determining whether the detected humidity is higher than the set humidity.

[0112] If not, step S14 is performed: the dehumidification module is not started to save energy.

[0113] If yes, step S15 is performed: the dehumidification module is started to dehumidify the fresh air to meet the user's humidity requirement.

[0114] By designing the above steps S11-S15, the total heat exchanger is first started, and when the humidity at the air outlet of the dehumidification module is not higher than the set humidity, the dehumidification module is not started; when the humidity at the air outlet of the dehumidification module is higher than the set humidity, the dehumidification module is started again, so as to achieve the purpose of energy saving.

[0115] In some embodiments of the present application, an auxiliary heating device 23 is arranged in the air duct 21-3 of the dehumidification module close to the air outlet 21-2, for increasing the outlet air temperature of the dehumidification module.

[0116] The auxiliary heating device 23 is generally an electric auxiliary heating device.

[0117] A temperature sensor 24 is arranged at the air outlet 21-2 of the dehumidification module, for detecting the temperature at the air outlet 21-2 and sending the detected temperature value to the control module.

[0118] The control module is further configured to, when receiving an instruction to start the fresh air function or the fresh air dehumidification function, first start the total heat exchanger, and then start the auxiliary heating device when detecting that the temperature at the air outlet of the dehumidification module is lower than the set temperature.

[0119] The control module specifically performs the following steps, which are shown in Figure 4 .

[0120] Step S21: when receiving an instruction to start the fresh air function or the fresh air dehumidification function, starting the total heat exchanger.

[0121] Step S22: detecting the temperature at the air outlet of the dehumidification module.

[0122] Step S23: determining whether the detected temperature is lower than the set temperature.

[0123] If not, step S24 is performed: the auxiliary heating device is not started to save energy.

[0124] If yes, step S25 is performed: the auxiliary heating device is started to heat the fresh air and increase the outlet air temperature of the dehumidification module to meet the user's temperature requirement.

[0125] By designing the above steps S21-S25, when the temperature at the air outlet of the dehumidification module is not lower than the set temperature, the auxiliary heating device is not started; when the temperature at the air outlet of the dehumidification module is lower than the set temperature, the auxiliary heating device is started again, so as to achieve the purpose of energy saving and power saving.

[0126] In some embodiments of the present application, the control module is further configured to: when the instruction of starting the dehumidification function without temperature reduction is received, first start the total heat exchanger, and then start the dehumidification module and the water module when the humidity at the air outlet of the dehumidification module is detected to be higher than the set humidity; and after the water module is started for a first set time length, detect the indoor temperature, and start the auxiliary heating device when the indoor temperature is detected to be lower than the set temperature.

[0127] The control module specifically performs the following steps, which are shown in Figure 5

[0128] Step S31: when the instruction of starting the dehumidification function without temperature reduction is received, start the total heat exchanger.

[0129] Step S32: detect the humidity at the air outlet of the dehumidification module.

[0130] Step S33: determine whether the detected humidity is higher than the set humidity.

[0131] If not, perform step S34: do not start the dehumidification module and the water module, so as to save energy and power.

[0132] If yes, perform step S35: start the dehumidification module, the water module, and the floor heating coil in the same room as the dehumidification module. The dehumidification module is used to dehumidify the fresh air, the water module is used to provide hot water for the floor heating coil, and the floor heating coil is used to heat compensate the indoor temperature, so as to meet the requirements of the user on humidity and temperature.

[0133] Step S36: after the water module is started for a first set time length, detect the indoor temperature.

[0134] Step S37: determine whether the detected indoor temperature is lower than the set temperature.

[0135] If not, perform step S38: do not start the auxiliary heating device, so as to save energy and power.

[0136] If yes, perform step S39: start the auxiliary heating device, so as to heat the dehumidified air, increase the air outlet temperature of the dehumidification module, and realize dehumidification without temperature reduction.

[0137] ​By designing steps S31 to S39, the total heat exchanger is first activated. If the humidity at the dehumidification module's outlet is not higher than the set humidity, the dehumidification module and the water module are deactivated. Once the humidity at the dehumidification module's outlet is higher than the set humidity, the dehumidification module and the water module are activated, thereby achieving energy and power conservation. If the indoor temperature is not lower than the set temperature, the auxiliary heating device is deactivated. Once the indoor temperature is lower than the set temperature, the auxiliary heating device is activated, thereby achieving energy and power conservation.

[0138] When the user sets the "fresh air" function or the "fresh air dehumidification" function on the control module, the user can also set the indoor temperature value, that is, the set temperature. When the temperature sensor detects that the outlet temperature is lower than the set temperature set by the user, the auxiliary heating device will turn on to heat the fresh air introduced into the room. This function ensures that the temperature of the fresh air introduced into the room meets the user's needs and improves the comfort experience. At the same time, when the two-in-one module performs the non-cooling dehumidification function, the heating function of the auxiliary heating device and the heat recovery mechanism of the water module jointly ensure the realization of non-cooling dehumidification, that is, the auxiliary heating device supplements the heat recovery mechanism of the water module to prevent the heat recovered from being insufficient to maintain a stable indoor temperature.

[0139] In some embodiments of the present application, the outdoor unit, the indoor unit, the dehumidification module, the control module, and the wired controller for controlling the indoor unit are all connected to the HomeBus.

[0140] The control module is connected to the heat exchanger via the 485 bus.

[0141] In this embodiment, the outdoor unit, indoor unit, and wired controller are all connected in series on a single HomeBus bus. By manually configuring the wired controller's communication destination, the wired controller performs targeted search and communication with the indoor unit on the HomeBus, thereby achieving point-to-point communication through the shared HomeBus bus. This approach can reduce the cost of deploying communication cables.

[0142] For example, see Figure 1 As shown, indoor units 1 and 2, a two-in-one heat exchanger and dehumidification module, wired controllers 1, 2, and 3 (control module), and a Modbus protocol converter are all connected to the same HomeBus communication bus. The HomeBus is a shared communication medium, and each communication unit competes for bus access. Communication conflicts are detected and handled using CSMA / CD.

[0143] Control module, i.e. Figure 1 The wired controller 3 is used to control the "full heat exchanger + dehumidification module" two-in-one module.

[0144] The control module has a HomeBus communication interface and a 485 communication interface. The HomeBus communication interface is connected with the HomeBus bus, and the 485 communication interface is connected with the total heat exchanger through the 485 bus.

[0145] The HomeBus communication interface is used for information interaction with the dehumidification module, and the 485 communication interface is used for information interaction with the total heat exchanger.

[0146] In some embodiments of the present application, the control module is further configured to: send a handshake request to the total heat exchanger through the 485 bus; if a handshake response of the total heat exchanger is received within a second set time length, the handshake connection is successful, and the control phase is entered; otherwise, the handshake connection fails, and an alarm prompt is performed to remind the user to timely maintenance.

[0147] The control module is further configured to: in the control phase, when a fresh air instruction of the user is received, the fresh air instruction is sent to the total heat exchanger; when the fresh air instruction of the user is not received, the total heat exchanger is communicated in a timing manner; if a timing communication response of the total heat exchanger is not received within a third set time length, it is determined that the total heat exchanger is offline, and an alarm prompt is performed to remind the user to timely maintenance.

[0148] The handshake phase of the control module and the total heat exchanger, specific steps are shown in Figure 6 .

[0149] Step S41: The control module sends a handshake request to the total heat exchanger through the 485 bus.

[0150] After receiving the handshake connection request of the control module, the total heat exchanger will perform a handshake response.

[0151] Step S42: It is judged whether the control module receives the handshake response of the total heat exchanger within a second set time length.

[0152] If not, step S43 is performed: the handshake connection fails, and the control module performs an alarm prompt, such as displaying a corresponding alarm code, to remind the user to timely maintenance.

[0153] If yes, step S44 is performed: the handshake connection is successful, and the control phase is entered.

[0154] By designing steps S41-S44, the handshake phase is monitored, and if the handshake response of the total heat exchanger is not received within the second set time length, the control module performs an alarm prompt to timely remind the user that the handshake connection fails.

[0155] The control phase of the control module and the total heat exchanger, specific steps are shown in Figure 7 .

[0156] Step S51: judging whether the control module receives a fresh air instruction from the user.

[0157] If yes, step S52 is performed: after receiving the fresh air instruction from the user, the control module sends the fresh air instruction to the total heat exchanger. After receiving the fresh air instruction, the total heat exchanger responds to the fresh air instruction and feeds back the running state to the control module.

[0158] If no, step S53 is performed: the control module performs the timed communication with the total heat exchanger.

[0159] Step S54: judging whether the control module receives the timed communication response from the total heat exchanger within the third set time length.

[0160] If yes, step S55 is performed: determining that the total heat exchanger is online.

[0161] If no, step S56 is performed: determining that the total heat exchanger is offline, and the control module performs the alarm prompt, such as displaying the corresponding alarm code, to remind the user to timely perform the maintenance.

[0162] Through the design of steps S51-S56, the control phase is monitored. If the timed communication response from the total heat exchanger is not received within the third set time length, the control module performs the alarm prompt to timely remind the user that the total heat exchanger is offline.

[0163] In some embodiments of the present application, the control module is further configured to send a handshake request to the dehumidification module through the HomeBus bus, and if the handshake response from the dehumidification module is received within the fourth set time length, the handshake connection is successful, and the control phase is entered; otherwise, the handshake connection fails, and the alarm prompt is performed to remind the user to timely perform the maintenance.

[0164] The control module is further configured to, in the control phase, send a dehumidification instruction to the dehumidification module when the dehumidification instruction from the user is received, and perform the timed communication with the dehumidification module when the dehumidification instruction from the user is not received, and if the timed communication response from the dehumidification module is not received within the fifth set time length, it is determined that the dehumidification module is offline, and the alarm prompt is performed to remind the user to timely perform the maintenance.

[0165] The handshake phase of the control module and the dehumidification module is specifically described in the handshake phase of the control module and the dehumidification module. Figure 8

[0166] Step S61: the control module sends a handshake request to the dehumidification module through the HomeBus bus.

[0167] After receiving the handshake connection request from the control module, the dehumidification module will perform the handshake response.

[0168] ​Step S62: determining whether the control module receives the handshake response of the dehumidification module within the fourth set time length.

[0169] If not, step S63 is performed: handshake connection fails, the control module prompts an alarm, such as displaying a corresponding alarm code, to remind the user to timely repair.

[0170] If yes, step S64 is performed: handshake connection succeeds, and the control phase is entered.

[0171] By designing steps S61-S64, the handshake phase is monitored. If the handshake response of the dehumidification module is not received within the fourth set time length, the control module prompts an alarm to timely remind the user of the handshake connection failure.

[0172] The control phase of the control module and the dehumidification module is specifically shown in Figure 9 .

[0173] Step S71: determining whether the control module receives the dehumidification instruction of the user.

[0174] If yes, step S72 is performed: after the control module receives the dehumidification instruction of the user, the control module sends the dehumidification instruction to the dehumidification module. After receiving the dehumidification instruction, the dehumidification module responds to the dehumidification instruction and feeds back the running state to the control module.

[0175] If not, step S73 is performed: the control module and the dehumidification module perform timed communication.

[0176] Step S74: determining whether the control module receives the timed communication response of the dehumidification module within the fifth set time length.

[0177] If yes, step S75 is performed: determining that the dehumidification module is online.

[0178] If not, step S76 is performed: determining that the dehumidification module is offline, and the control module prompts an alarm, such as displaying a corresponding alarm code, to remind the user to timely repair.

[0179] By designing steps S71-S76, the control phase is monitored. If the timed communication response of the dehumidification module is not received within the fifth set time length, the control module prompts an alarm to timely remind the user that the dehumidification module is offline.

[0180] In some embodiments of the application, the drive-by-wire controller is configured to: send a handshake request to the indoor unit; if the handshake response of the indoor unit is received within the sixth set time length, the handshake connection succeeds, and the control phase is entered; otherwise, the handshake connection fails, and an alarm is prompted to remind the user to timely repair.

[0181] The line controller is further configured to, in the control stage, send a control instruction to the indoor unit when receiving an operation instruction of the user, and perform timing communication with the indoor unit when not receiving the operation instruction of the user, and determine that the indoor unit is offline if a timing communication response of the indoor unit is not received within a seventh set time length, and perform alarm prompting to remind the user to timely perform maintenance.

[0182] The handshaking stage of the line controller and the indoor unit, specific steps are shown in Figure 10

[0183] Step S81: The line controller sends a handshaking request to the indoor unit through the HomeBus bus.

[0184] The line controller and the indoor unit adopt a directional communication mode when performing power-on handshaking connection.

[0185] The device ID of the indoor unit requiring directional communication is set on the line controller. After receiving the device ID of the indoor unit input by the user, the line controller initiatively initiates a handshaking connection process with the indoor unit, and confirms whether the indoor unit exists on the HomeBus communication bus.

[0186] The target indoor unit will perform a handshaking response after receiving the handshaking connection request of the line controller.

[0187] Step S82: Determine whether the line controller receives the handshaking response of the indoor unit within a sixth set time length.

[0188] If not, step S83 is performed: the handshaking connection fails, and the line controller performs alarm prompting, such as displaying a corresponding alarm code, to remind the user to timely perform maintenance.

[0189] If yes, step S84 is performed: the handshaking connection is successful, and the control stage is entered.

[0190] By designing steps S81-S84, the handshaking stage is monitored, and if the handshaking response of the indoor unit is not received within the sixth set time length, the line controller performs alarm prompting to timely remind the user that the handshaking connection fails.

[0191] The control stage of the line controller and the indoor unit, specific steps are shown in Figure 11

[0192] Step S91: Determine whether the line controller receives an operation instruction of the user.

[0193] If yes, step S92 is performed: the line controller receives the operation instruction of the user, and sends a control instruction to the indoor unit. The indoor unit receives the control instruction, responds to the control instruction, and feeds back a running state to the line controller.

[0194] If not, step S93 is performed: the line controller performs timing communication with the indoor unit.​​

[0195] Step S94: Determine whether the wired controller receives the timed communication response from the indoor unit within the seventh set time period.

[0196] If yes, execute step S95: determine whether the indoor unit is online.

[0197] If not, step S96 is executed: the indoor unit is determined to be offline, and the wired controller issues an alarm prompt, such as displaying a corresponding alarm code, to remind the user to perform maintenance in time.

[0198] By designing steps S91 to S96, the control phase is monitored. If no timed communication response is received from the indoor unit within the seventh set time period, the wired controller will issue an alarm to promptly remind the user that the indoor unit is offline.

[0199] For example, see Figure 1 As shown, the wired controller is the control terminal for the user to interact with the indoor unit. The wired controller 1 specifically controls the indoor unit 1. Although it is a point-to-point communication, in order to reduce the system cost, the communication between the wired controller and the indoor unit is not through an independent communication line, but is connected in series on the HomeBus bus.

[0200] Figure 1 In the system, devices are connected in series through the HomeBus bus, and each device communicates through the HomeBus protocol.

[0201] The wired controller 1 is used to control the indoor unit 1 to achieve one-to-one control, including power on / off settings, cooling and heating settings, air volume adjustment, temperature adjustment, etc. At the same time, the wired controller 1 can independently start the floor heating function of the water module.

[0202] The wired controller 2 is used to control the indoor unit 2 to achieve one-to-one control, including power on / off settings, cooling and heating settings, air volume adjustment, temperature adjustment, etc. At the same time, the wired controller 2 can independently start the floor heating function of the water module.

[0203] The wire controller 3 (control module) is used to control the "full heat exchanger + dehumidification module" two-in-one module to achieve one-to-one control, realize the power on / off setting, fresh air setting, dehumidification function setting and target humidity value, and target humidity value adjustment. At the same time, the wire controller 3 can also independently start the floor heating function of the water module.

[0204] Indoor unit 1 and indoor unit 2 are industry-standard multi-split units used to achieve cooling and heating on the air side; multi-split units similar to indoor unit 1 and indoor unit 2 can be further added to this system.

[0205] The switch control of the water valve of the floor heating coil is executed by the outdoor unit. When the user sets the floor heating function or the non-cooling and dehumidifying function from the wire controller 3, the wire controller 3 sends the water valve switch instruction to the outdoor unit through the HomeBus bus, and the outdoor unit circuit board controls the switch of the relay to control the switch of the water valve of the floor heating coil.

[0206] The wire controller 1 and the indoor unit 1 adopt the directional communication mode when the handshake connection is powered on. The equipment ID of the indoor unit 1 which needs directional communication is set on the wire controller 1, the wire controller 1 initiatively initiates the handshake connection process with the indoor unit 1, confirms whether the indoor unit 1 exists on the HomeBus bus, and the indoor unit 1 sends the handshake response after receiving the handshake connection request of the wire controller 1. After the interaction of all the state information related to control, the handshake connection is completed, and the wire controller 1 and the indoor unit 1 enter the normal control stage.

[0207] In the normal control stage, the indoor unit 1 only communicates with the wire controller 1, and does not communicate with other wire controllers. When the user operates the wire controller 1 to control the indoor unit 1, the wire controller 1 immediately sends the control text to the indoor unit 1, and the indoor unit 1 feeds back the running state to the wire controller 1 after responding to the control. In the normal control stage without user operation of the wire controller, the wire controller 1 and the indoor unit 1 perform timing communication (such as 30s timing communication) to keep the information of both sides synchronized. In addition to directional communication with the indoor unit 1, the wire controller 1 can directly send a command to the outdoor unit to start the floor heating function of the water module in the outdoor unit, and the outdoor unit starts to supply heat to the water path of the corresponding room (room 1).

[0208] The timeout time of the wire controller 1 and the indoor unit 1 in the handshake connection stage is 30s. If the wire controller 1 does not complete the handshake with the indoor unit 1 within 30s, it is considered that the indoor unit 1 is not searched, and the wire controller 1 displays an alarm code. In the normal control stage, the timeout time of the timing communication of the wire controller 1 and the indoor unit 1 is 2min. If the wire controller 1 does not receive the timing communication response of the indoor unit 1 within 2min, it is considered that the indoor unit 1 is offline, and the wire controller 1 displays an alarm code.

[0209] The indoor unit 1 and the wire controller 1 are installed in the same room 1, and are used to realize the refrigeration and heating control of the room 1. The indoor unit 2 realizes the same function as the indoor unit 1, and the wire controller 2 realizes the same function as the wire controller 1. The indoor unit 2 and the wire controller 2 are matched to realize the refrigeration and heating control of the room 2.

[0210] When the wire controller 3 (control module) is powered on and performs handshake with the "total heat exchanger + dehumidification module", the handshake connection of the HomeBus bus and the 485 bus needs to be performed. After the handshake is completed, the normal control stage is entered, and the two paths are timed for 30s communication to synchronize the information.

[0211] The line controller 3 and the "total heat exchanger + dehumidification module" two-in-one module need to perform simultaneous handshaking of the HomeBus channel and the 485 channel in the handshaking connection stage, and the handshaking timeout time of the two channels is 30s, and any failure of handshaking of any channel displays the corresponding fault code.

[0212] In the general control stage, the line controller 3 performs 30s timed communication with the dehumidification module through the HomeBus bus to keep information synchronization, and performs 30s timed communication with the total heat exchanger through the 485 bus to keep information synchronization.

[0213] The timed communication timeout time of the line controller 3 and the dehumidification module is 2min, and if the line controller 3 does not receive the timed communication response of the dehumidification module within 2min, it is considered that the dehumidification module is offline, and the line controller 3 displays an alarm code.

[0214] The timed communication timeout time of the line controller 3 and the total heat exchanger is 2min, and if the line controller 3 does not receive the timed communication response of the total heat exchanger within 2min, it is considered that the total heat exchanger is offline, and the line controller 3 displays an alarm code.

[0215] In some embodiments of the present application, the multi-split air conditioning system further comprises a Modbus protocol converter for bidirectional conversion of the HomeBus protocol and the Modbus protocol; the Modbus protocol converter has a HomeBus communication interface connected with the HomeBus bus; and the Modbus protocol converter has a Modbus communication interface for connection and communication with intelligent control devices (such as smart home devices).

[0216] The intelligent control devices can simply and conveniently control all devices on the HomeBus bus through the Modbus protocol converter.

[0217] In some embodiments of the present application, the Modbus protocol converter is configured to broadcast a handshaking connection instruction to the HomeBus bus; to confirm the number and types of devices on the HomeBus bus according to the received handshaking response; to send a state request instruction to each device on the HomeBus bus and receive the feedback running state information; and to enter the control stage after collecting the running state information of all devices.

[0218] The Modbus protocol converter is further configured to convert the received control instruction into a control instruction of the HomeBus protocol and send it to the corresponding device through the HomeBus bus in the control stage.

[0219] Through the handshake connection with the devices on the HomeBus bus by the Modbus protocol converter, the Modbus protocol converter can obtain the types and running states of all the devices on the HomeBus bus, so as to control the devices on the HomeBus bus by the Modbus protocol converter.

[0220] The Modbus protocol converter as the centralized controller of the system realizes the bidirectional conversion between the HomeBus protocol and the Modbus protocol, realizes the centralized control of all the devices on the HomeBus bus, and provides a Modbus communication interface for the third-party smart home devices.

[0221] After the Modbus protocol converter is powered on, the handshake connection instruction is broadcasted on the HomeBus bus, all the devices on the HomeBus bus, including the outdoor unit, the indoor unit 1, the indoor unit 2, the "heat exchanger + dehumidification module" two-in-one module, the drive-by-wire controller 1, the drive-by-wire controller 2 and the drive-by-wire controller 3, respond to the handshake instruction, the Modbus protocol converter can confirm the number and types of the devices on the HomeBus bus after receiving the responses, and the Modbus protocol converter sends the state request instruction to each device on the HomeBus bus one by one, and the device receiving the state request instruction feeds back the current device running state to the Modbus protocol converter.

[0222] When the Modbus protocol converter collects the state information of all the devices, the Modbus protocol converter enters the normal control phase.

[0223] In the normal control phase, the user can issue a control instruction to the Modbus protocol converter through the third-party smart home device, the Modbus protocol converter converts the received control instruction into a control instruction of the HomeBus protocol, and sends it to the corresponding device through the HomeBus bus. After the device receives the control instruction, it responds and feeds back the running state text to the Modbus protocol converter, and the Modbus protocol converter places the received device state information in the local Modbus register, waiting for the third-party smart home device to read.

[0224] In order to reduce the communication pressure of the HomeBus bus, the Modbus protocol converter mainly obtains the running states of the devices on the HomeBus bus by listening to the HomeBus bus texts when entering the normal control phase, the indoor unit and the outdoor unit, the indoor unit and the drive-by-wire controller, after entering the normal control phase, all perform 30s timed communication to exchange their running state information, and the Modbus protocol converter listens to these communication texts.

[0225] The third-party smart home device can realize "fresh air" control and "fresh air dehumidification" control on the "total heat exchanger + dehumidification module" two-in-one module through the Modbus protocol converter.

[0226] When the Modbus protocol converter receives the "fresh air" function controlled by the third-party smart home device, it sends the fresh air instruction to the line controller 3 through the HomeBus bus, and the line controller 3 forwards the instruction to the 485 communication bus after receiving the instruction, and controls the total heat exchanger to run the fresh air function.

[0227] When the Modbus protocol converter receives the "fresh air dehumidification" function controlled by the third-party smart home device, it sends the fresh air instruction to the line controller 3 through the HomeBus bus, and the line controller 3 forwards the instruction to the 485 communication bus, and starts the fresh air operation of the total heat exchanger. At the same time, the Modbus protocol converter sends the dehumidification instruction to the dehumidification module through the HomeBus bus, and the dehumidification module starts the dehumidification function.

[0228] If the third-party smart home device also sets the "dehumidification without temperature reduction" function, the Modbus protocol converter will send a control instruction to the outdoor unit at the same time to start the "condensing heat recovery" function of the water module, and the heat taken away from the indoor during dehumidification will be recovered through the water module and then supplied to the floor heating coil to improve the indoor temperature.

[0229] The running state of the total heat exchanger is synchronized to the Modbus protocol converter in the following way: In the handshake stage, the Modbus protocol converter requests the running state of the total heat exchanger from the line controller 3, the line controller 3 in turn requests the running state from the total heat exchanger, and the total heat exchanger responds to the request and feeds back the state information to the line controller 3, and the line controller 3 forwards it to the Modbus protocol converter after protocol conversion.

[0230] The Modbus protocol converter does not actively request the total heat exchanger state from the line controller 3 in the normal control stage, and there is a 30s timing communication between the total heat exchanger and the line controller 3. When the line controller 3 finds that the running state of the total heat exchanger has been updated, it will forward the new state to the Modbus protocol converter.

[0231] In some embodiments of the application, the Modbus protocol converter is also used to set a shielding function for the control module and each line controller. When the control module or the line controller detects that the user operates the shielded function, a prompt is issued.

[0232] The Modbus protocol converter can set the shielding of the control module and each line controller to realize the control function. The Modbus protocol converter can send a "function shielding" instruction to the control module and the line controller to shield a certain function of the control module and the line controller, such as the switching function, the refrigeration and heating adjustment function, the air volume adjustment, the temperature adjustment, and the humidity adjustment of the line controller.

[0233] When the user operates a certain shielded function on the line controller, the line controller does not respond to the shielded function and sends a text prompt to the user, such as "This function is shielded by the central controller". The shielding function can prevent misoperation on the line controller, such as misoperation by children or the elderly. The corresponding function shielding can be removed by sending a "shield function removal" instruction from the Modbus protocol converter to the line controller, so that the corresponding operation on the line controller is allowed again.

[0234] The multi-split air conditioning system of the embodiment realizes the functions of fresh air dehumidification, condensing heat recovery, and the like through linkage control, and can be flexibly connected to an intelligent home control system.

[0235] The multi-split air conditioning system of the embodiment organically combines a fresh air device, a dehumidification device, a refrigeration and heating device, and a floor heating device, and simultaneously realizes the functions of fresh air, dehumidification, refrigeration and heating, and floor heating. The scheme has low cost, occupies small indoor space, and is flexibly controlled. The Modbus protocol converter can be connected to a third-party intelligent home system to be integrated into a whole-house intelligent control system.

[0236] The multi-split air conditioning system of the embodiment has comprehensive functions, low cost, and flexible control, and can be freely connected to a third-party control system. One set of air conditioning system effectively solves the needs of users for fresh air, refrigeration and heating, dehumidification, and floor heating functions, and the needs of integration into an intelligent home to realize intelligent control.

[0237] In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0238] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed by the present application can be easily conceived by those skilled in the art, and should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-split air conditioning system, comprising: an outdoor unit; a plurality of indoor units connected in parallel; a plurality of floor heating coils connected in parallel; a water module connected to the outdoor unit through a refrigerant pipeline and connected to the floor heating unit through a water pipeline; characterized in that further comprising: a dehumidification module comprising a housing, the housing having an air inlet and an air outlet, the housing having an air duct connecting the air inlet and the air outlet, the air duct having a dehumidification heat exchanger arranged therein, the dehumidification heat exchanger being connected to the outdoor unit through a refrigerant pipeline; a total heat exchanger having a fresh air inlet, a fresh air outlet, a dirty air inlet and a dirty air outlet, the fresh air inlet being connected to an outdoor space, the fresh air outlet being connected to the air inlet of the dehumidification module, the dirty air inlet being connected to an indoor space, and the dirty air outlet being connected to the outdoor space; a control module configured to: start the total heat exchanger upon receiving an instruction to start a fresh air function; start the total heat exchanger and the dehumidification module upon receiving an instruction to start a fresh air dehumidification function; and start the total heat exchanger, the dehumidification module and the water module upon receiving an instruction to start a dehumidification function without temperature drop. 2.The multi-split air conditioning system of claim 1, wherein the control module is further configured to: start the total heat exchanger first upon receiving an instruction to start a fresh air dehumidification function, and then start the dehumidification module upon detecting that the humidity at the air outlet of the dehumidification module is higher than a set humidity. 3.The multi-split air conditioning system of claim 2, wherein the air duct of the dehumidification module is provided with an auxiliary heating device, and the control module is further configured to: start the total heat exchanger first upon receiving an instruction to start a fresh air function or a fresh air dehumidification function, and then start the auxiliary heating device upon detecting that the temperature at the air outlet of the dehumidification module is lower than a set temperature. 4.The multi-split air conditioning system of claim 1, wherein the air duct of the dehumidification module is provided with an auxiliary heating device, and the control module is further configured to: start the total heat exchanger first upon receiving an instruction to start a dehumidification function without temperature drop, and then start the dehumidification module and the water module upon detecting that the humidity at the air outlet of the dehumidification module is higher than a set humidity; and start the auxiliary heating device upon detecting that the indoor temperature is lower than a set temperature after the water module is started for a first set time period. The outdoor unit, the indoor units, the dehumidification module, the control module and a drive-by-wire controller for controlling the indoor units are all connected to a HomeBus bus. 6.The multi-split air conditioning system of claim 5, wherein the control module is further configured to: send a handshake request to the total heat exchanger, and if a handshake response from the total heat exchanger is received within a second set time period, the handshake connection is successful and the system enters a control phase; otherwise, the handshake connection fails and an alarm is prompted. ​ ​ 5.The multi-split air conditioning system according to claim 1, characterized by: ​ ​ ​ ​ In the control stage, when receiving the new air instruction of the user, the new air instruction is sent to the total heat exchanger; when not receiving the new air instruction of the user, the timing communication is carried out with the total heat exchanger; if the timing communication response of the total heat exchanger is not received within the third set time length, it is determined that the total heat exchanger is offline, and the alarm prompt is carried out.

7. The multi-split air conditioning system of claim 5, wherein: The control module is further configured to: send a handshake request to the dehumidification module; if a handshake response of the dehumidification module is received within a fourth set time length, the handshake connection is successful, and the control stage is entered; otherwise, the handshake connection fails, and the alarm prompt is carried out; in the control stage, when receiving the dehumidification instruction of the user, the dehumidification instruction is sent to the dehumidification module; when not receiving the dehumidification instruction of the user, the timing communication is carried out with the dehumidification module; if the timing communication response of the dehumidification module is not received within a fifth set time length, it is determined that the dehumidification module is offline, and the alarm prompt is carried out.

8. The multi-split air conditioning system of claim 5, wherein: The drive-by-wire controller is configured to: send a handshake request to the indoor unit; if a handshake response of the indoor unit is received within a sixth set time length, the handshake connection is successful, and the control stage is entered; otherwise, the handshake connection fails, and the alarm prompt is carried out; in the control stage, when receiving the operation instruction of the user, the control instruction is sent to the indoor unit; when not receiving the operation instruction of the user, the timing communication is carried out with the indoor unit; if the timing communication response of the indoor unit is not received within a seventh set time length, it is determined that the indoor unit is offline, and the alarm prompt is carried out. 9.The multi-split air conditioning system according to claim 5, characterized by: Further comprising: a Modbus protocol converter for bidirectional conversion between HomeBus protocol and Modbus protocol; it has a HomeBus communication interface connected with the HomeBus bus; it has a Modbus communication interface for connecting with the intelligent control device.

10. The multi-split air conditioning system of claim 9, wherein: The Modbus protocol converter is configured to: broadcast a handshake connection instruction to the HomeBus bus; confirm the number and type of devices on the HomeBus bus according to the received handshake response; send a state request instruction to each device on the HomeBus bus one by one, and receive the feedback running state information; after collecting the running state information of all devices, enter the control stage; in the control stage, the received control instruction is converted into a control instruction of the HomeBus protocol, and is sent to the corresponding device through the HomeBus bus.

Images