An air conditioning unit and its operation control method and device.

Abstract

This invention discloses an air conditioning unit and its operation control method and device. The unit includes a first evaporator, a first compressor, a first condenser, and a first throttling valve connected in a loop, and a second evaporator, a second compressor, a second condenser, and a second throttling valve also connected in a loop. Branch pipes are provided between the first evaporator and the second compressor, between the outlets of the first and second compressors, between the outlets of the first and second condensers, between the inlet of the first and second throttling valves, and between the outlet of the second evaporator and the outlet of the second compressor. Each branch pipe is equipped with a corresponding on / off valve. On / off valves are also provided on the main pipes between the first compressor and the first condenser, between the second evaporator and the second compressor, and between the second compressor and the second condenser. This unit has a wider cooling capacity adjustment range and a greater dehumidification capacity without increasing power consumption.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning unit and its operation control method and device. Background Technology

[0002] The schematic diagram of a common dual-system air conditioner's refrigeration system is as follows: Figure 1 As shown. Each refrigeration system contains the four main components required for a direct expansion mechanical refrigeration system: evaporator 01, compressor 02, condenser 03, and throttling device 04. The air paths of the two systems do not interfere with each other; that is, the indoor return air is divided into two paths: one path passes through the evaporator of the first refrigeration system A, is cooled, and then sent into the room or air duct; similarly, the other path passes through the evaporator of the second refrigeration system B, is cooled, and then sent into the room or air duct. Similarly, the air paths of the condensers of the two systems do not interfere with each other. The above system is simple in design and has a single function, only providing refrigeration and corresponding dehumidification.

[0003] Regarding its cooling function: If the compressor is a fixed-frequency compressor, then when the return air conditions (indoor dry-bulb temperature and humidity) and outdoor conditions remain unchanged, its cooling capacity is constant. The unit can only regulate temperature by starting and stopping. If the compressor is a variable-frequency compressor, then limited by the speed limit of the variable-frequency compressor, the minimum cooling capacity adjustment range of the unit is approximately 30% to 100%; for low-load applications, the unit's adjustment capability is still limited.

[0004] Regarding its dehumidification function: Dehumidification can occur during refrigeration operation, but its dehumidification capacity is actually determined by the unit's return air conditions (dry-bulb temperature and air moisture content). If dehumidification is achieved by lowering the evaporation temperature of the refrigerant in the evaporator, this can be achieved by reducing the opening of the electronic expansion valve or reducing the fan speed. While reducing the opening of the electronic expansion valve can lower the evaporation temperature, it will result in a higher superheat of the refrigerant at the evaporator outlet, with a larger area of ​​the evaporator in the superheated gas section, resulting in lower heat exchange capacity and not necessarily increasing the system's dehumidification capacity. Reducing the fan speed can effectively increase the dehumidification capacity, but for some special applications (such as server rooms), high air volume and low enthalpy difference are required. Only high air volume can ensure air circulation to remote equipment to cool it, thus limiting the increase in dehumidification capacity.

[0005] Furthermore, under low cooling demand conditions, if there is a high humidity load, the unit's cooling and dehumidification capacity may not match the room's heat-to-moisture ratio. In this case, to meet the room's dehumidification needs, the unit's cooling capacity must be increased. To balance the excess cooling capacity, thermal compensation is required to prevent the room temperature from dropping. This increases the system's power consumption, resulting in waste as cooling and heating operate simultaneously.

[0006] In summary, this system has a limited range of cooling capacity adjustment, insufficient dehumidification capacity, and limited functionality. Summary of the Invention

[0007] This invention provides an air conditioning unit and its operation control method and device. The air conditioning unit has a wider cooling capacity adjustment range and a greater dehumidification capacity without increasing power consumption.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An air conditioning unit includes a first refrigeration system, a second refrigeration system, a first fan, and a second fan. The first refrigeration system includes a first evaporator, a first compressor, a first condenser, and a first expansion valve connected in a loop via a main pipeline. The second refrigeration system includes a second evaporator, a second compressor, a second condenser, and a second expansion valve connected in a loop via a main pipeline. The first fan corresponds to the first evaporator and the second evaporator, and the second fan corresponds to the first condenser and the second condenser.

[0010] A first branch pipe is connected between the outlet of the first evaporator and the inlet of the second compressor, and a first switching valve is installed on the first branch pipe. A second branch pipe is connected between the outlet of the first compressor and the outlet of the second compressor, and a second switching valve is installed on the second branch pipe. A third branch pipe is connected between the outlet of the first condenser and the outlet of the second condenser, and a third switching valve is installed on the third branch pipe. A fourth branch pipe is connected between the inlet of the first throttle valve and the inlet of the second throttle valve, and a fourth switching valve is installed on the fourth branch pipe. A fifth branch pipe is connected between the outlet of the second evaporator and the outlet of the second compressor, and a fifth switching valve is installed on the fifth branch pipe. A sixth switching valve is installed on the main pipe connecting the first compressor and the first condenser. A seventh switching valve is installed on the main pipe connecting the second evaporator and the second compressor. An eighth switching valve is installed on the main pipe connecting the second compressor and the second condenser.

[0011] Optionally, the system further includes a controller, which is signal-connected to the first compressor, the second compressor, the first fan, the second fan, the first throttle valve, the second throttle valve, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, the fifth switching valve, the sixth switching valve, the seventh switching valve, and the eighth switching valve; the controller is used for:

[0012] According to the preset operating mode of the air conditioning unit, the working status of the first compressor, the second compressor, the first fan, the second fan, the first throttle valve, the second throttle valve, the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the fifth switch valve, the sixth switch valve, the seventh switch valve, and the eighth switch valve are controlled to switch the operating mode of the air conditioning unit.

[0013] Optionally, the controller is specifically used for:

[0014] When the dehumidification demand of the air conditioning unit is less than or equal to 0% and the cooling demand is greater than 0%, the first, second, third, fourth, and fifth switch valves are closed, and the sixth, seventh, and eighth switch valves are opened, so that the air conditioning unit operates in a non-dehumidification and cooling mode.

[0015] Optionally, the controller is specifically used for:

[0016] When the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the fifth and seventh switch valves are controlled to close, and the first, second, third, fourth, sixth, and eighth switch valves are controlled to open, so that the air conditioning unit can operate in a mode with adjustable dehumidification and adjustable cooling.

[0017] Optionally, the controller is specifically used for:

[0018] When the dehumidification demand of the air conditioning unit is greater than 100% and the cooling demand is greater than or equal to 0%, the third, sixth, and seventh switching valves are closed, and the first, second, fourth, fifth, and eighth switching valves are opened, so that the air conditioning unit can operate in a mode with strong dehumidification and adjustable cooling.

[0019] Optionally, the fifth, sixth, and eighth switching valves are adjustable-opening switching valves; the controller is specifically used for:

[0020] The opening degrees of the fifth, sixth, and eighth switching valves are adjusted according to the cooling capacity or the compensating heating capacity during dehumidification.

[0021] Optionally, the controller is specifically used for:

[0022] When the dehumidification demand of the air conditioning unit is greater than 0% and the cooling demand is less than 0%, the third, sixth, seventh, and eighth switch valves are closed, and the first, second, fourth, and fifth switch valves are opened, so that the air conditioning unit can operate in a dehumidification and heating mode.

[0023] Optionally, the first refrigeration system further includes a first check valve, a second check valve, and a first refrigerant pump, and the second refrigeration system further includes a third check valve, a fourth check valve, and a second refrigerant pump;

[0024] The first check valve is connected in parallel to the first compressor via a sixth branch pipeline; the second check valve is located on the main pipeline between the first condenser and the first throttling valve; the first refrigerant pump is connected in parallel to the second check valve via a seventh branch pipeline; the third check valve is connected between the outlet of the second evaporator and the inlet of the second condenser via an eighth branch pipeline; the fourth check valve is located on the main pipeline between the second condenser and the second throttling valve; and the second refrigerant pump is connected in parallel to the fourth check valve via a ninth branch pipeline.

[0025] A ninth switching valve is provided on the main pipeline connecting the outlet of the first evaporator to the first compressor and the first check valve; a tenth switching valve is provided on the main pipeline connecting the outlet of the first condenser to the second check valve and the first refrigerant pump; the outlet of the second condenser is connected to the third branch pipeline and the ninth branch pipeline via the tenth branch pipeline; an eleventh switching valve is provided on the tenth branch pipeline; the inlet of the second throttle valve is connected to the fourth branch pipeline and the ninth branch pipeline via the eleventh branch pipeline; and a twelfth switching valve is provided on the eleventh branch pipeline.

[0026] The controller is signal-connected to the first fluorine pump, the second fluorine pump, the ninth switching valve, the tenth switching valve, the eleventh switching valve, and the twelfth switching valve. Specifically, the controller is used for:

[0027] Based on the dehumidification and cooling requirements of the air conditioning unit, the operating status of the first refrigerant pump, the second refrigerant pump, the ninth switching valve, the tenth switching valve, the eleventh switching valve, and the twelfth switching valve are controlled to switch the operating mode of the air conditioning unit.

[0028] Optionally, the controller is specifically used for:

[0029] When the outdoor temperature is lower than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 100%, and the cooling demand is greater than 100%, the first, second, sixth, ninth, tenth, eleventh, and twelfth switch valves are opened, and the third, fourth, fifth, seventh, and eighth switch valves are closed, so that the air conditioning unit operates in natural cooling, strong dehumidification, and high cooling modes.

[0030] Optionally, it also includes a thirteenth switching valve, a fourteenth switching valve, and a fifteenth switching valve. The thirteenth switching valve is provided on the ninth branch pipe between the outlet of the second condenser and the fourth check valve. A twelfth branch pipe is connected between the outlet of the second condenser and the outlet of the second refrigerant pump. The fourteenth switching valve is provided on the twelfth branch pipe. A thirteenth branch pipe is connected between the inlet of the second refrigerant pump and the inlet of the second throttle valve. The fifteenth switching valve is provided on the thirteenth branch pipe.

[0031] The controller is connected to the thirteenth, fourteenth, and fifteenth switching valves, and the controller is used for:

[0032] Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the thirteenth, fourteenth, and fifteenth switching valves are controlled to switch the operating modes of the air conditioning unit.

[0033] Optionally, the controller is specifically used for:

[0034] When the outdoor temperature is higher than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the first, second, third, fourth, seventh, eleventh, twelfth, and thirteenth switch valves are closed, while the fifth, sixth, eighth, ninth, tenth, fourteenth, and fifteenth switch valves are opened, so that the air conditioning unit operates in a heat recovery and cooling mode.

[0035] Based on the same inventive concept, the present invention also provides an operation control method for an air conditioning unit, applicable to any of the air conditioning units provided in the above technical solutions, comprising:

[0036] Obtain the dehumidification and cooling requirements of the air conditioning unit;

[0037] Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the first compressor, second compressor, first fan, second fan, first throttle valve, second throttle valve, first switching valve, second switching valve, third switching valve, fourth switching valve, fifth switching valve, sixth switching valve, seventh switching valve, and eighth switching valve are controlled to switch the operating mode of the air conditioning unit.

[0038] Based on the same inventive concept, the present invention also provides an operation control device for an air conditioning unit, comprising:

[0039] The acquisition unit is used to acquire the dehumidification and cooling requirements of the air conditioning unit.

[0040] The control unit is used to control the operating status of the first compressor, the second compressor, the first fan, the second fan, the first throttle valve, the second throttle valve, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, the fifth switching valve, the sixth switching valve, the seventh switching valve, and the eighth switching valve according to the dehumidification and cooling requirements of the air conditioning unit, so as to switch the operating mode of the air conditioning unit.

[0041] This invention provides an air conditioning unit and its operation control method and device. In this air conditioning unit, a first refrigeration system includes a first evaporator, a first compressor, a first condenser, and a first throttling valve connected sequentially via a main pipeline. A second refrigeration system includes a second evaporator, a second compressor, a second condenser, and a second throttling valve connected sequentially via a main pipeline. To upgrade the piping of the air conditioning unit, a first branch pipeline, a second branch pipeline, a third branch pipeline, a fourth branch pipeline, and a fifth branch pipeline are connected between the first and second refrigeration systems. A first to a fifth switching valve are respectively installed on the first to fifth branch pipelines. A sixth switching valve is installed on the main pipeline between the first compressor and the first condenser. A seventh switching valve is installed on the main pipeline between the second evaporator and the second compressor. An eighth switching valve is installed on the main pipeline between the second compressor and the second condenser. By controlling the operating states of the first to eighth switching valves, different refrigeration systems can be constructed through the first and second refrigeration systems and the connected pipelines, allowing the air conditioning unit to flexibly change between various operating modes. Specifically, the aforementioned air conditioning unit enables the first compressor and the second compressor to flexibly switch between parallel and independent operation, thereby increasing the adjustment range of the cooling capacity of the air conditioning system; and enables the first evaporator or the second evaporator to flexibly switch between an evaporator or a condenser, or a reheat compensation heater, thereby increasing the adjustment range of the system dehumidification capacity, without the need for a separate heat compensation mechanism, thus reducing the energy consumption of dehumidification heat compensation. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of an air conditioning unit in the prior art;

[0043] Figure 2 This is a schematic diagram of the structure of an air conditioning unit provided in an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the operating status of an air conditioning unit provided in an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0046] Figure 5This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0047] Figure 6 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0048] Figure 7 This is a schematic diagram of the structure of an air conditioning unit provided in an embodiment of the present invention;

[0049] Figure 8 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0050] Figure 9 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0051] Figure 10 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0052] Figure 11 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0053] Figure 12 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0054] Figure 13 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0055] Figure 14 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0056] Figure 15 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0057] Figure 16 This is a schematic diagram of the structure of an air conditioning unit provided in an embodiment of the present invention;

[0058] Figure 17 This is a schematic diagram of the operating status of another air conditioning unit provided in an embodiment of the present invention;

[0059] Figure 18 A flowchart of an operation control method for an air conditioning unit provided in an embodiment of the present invention;

[0060] Figure 19 This is a schematic diagram of the operation control device for an air conditioning unit provided in an embodiment of the present invention.

[0061] icon:

[0062] 11-First evaporator; 12-First compressor; 13-First condenser; 14-First throttle valve; 15-First check valve; 16-Second check valve; 17-First refrigerant pump; 21-Second evaporator; 22-Second compressor; 23-Second condenser; 24-Second throttle valve; 25-Third check valve; 26-Fourth check valve; 27-Second refrigerant pump; 3-First fan; 4-Second fan;

[0063] L1 - First branch pipe; L2 - Second branch pipe; L3 - Third branch pipe; L4 - Fourth branch pipe; L5 - Fifth branch pipe; L6 - Sixth branch pipe; L7 - Seventh branch pipe; L8 - Eighth branch pipe; L9 - Ninth branch pipe; L10 - Tenth branch pipe; L11 - Eleventh branch pipe; L12 - Twelfth branch pipe; L13 - Thirteenth branch pipe;

[0064] k1 - First switching valve; k2 - Second switching valve; k3 - Third switching valve; k4 - Fourth switching valve; k5 - Fifth switching valve; k6 - Sixth switching valve; k7 - Seventh switching valve; k8 - Eighth switching valve; k9 - Ninth switching valve; k10 - Tenth switching valve; k11 - Eleventh switching valve; k12 - Twelfth switching valve; k13 - Thirteenth switching valve; k14 - Fourteenth switching valve; k15 - Fifteenth switching valve. Detailed Implementation

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] Please refer to Figure 2 This invention provides an air conditioning unit, including a first refrigeration system, a second refrigeration system, a first fan 3, a second fan 4, and a ventilation duct. The first refrigeration system includes a first evaporator 11, a first compressor 12, a first condenser 13, and a first throttling valve 14, which are sequentially connected in a main pipeline. The second refrigeration system includes a second evaporator 21, a second compressor 22, a second condenser 23, and a second throttling valve 24, which are sequentially connected in a main pipeline. The first fan 3 corresponds to the first evaporator 11 and the second evaporator 21, and the second fan 4 corresponds to the first condenser 13 and the second condenser 23. The ventilation duct includes a return air inlet and a supply air inlet communicating with a machine room. The first evaporator 11, the second evaporator 21, and the first fan 3 are located within the ventilation duct.

[0067] A first branch pipe L1 connects the outlet of the first evaporator 11 to the inlet of the second compressor 22, and a first switching valve k1 is installed on the first branch pipe L1. A second branch pipe L2 connects the outlet of the first compressor 12 to the outlet of the second compressor 22, and a second switching valve k2 is installed on the second branch pipe L2. A third branch pipe L3 connects the outlet of the first condenser 13 to the outlet of the second condenser 23, and a third switching valve k3 is installed on the third branch pipe L3. The inlet of the first throttle valve 14 is connected to the inlet of the second throttle valve 24. There is a fourth branch pipe L4, on which a fourth switching valve k4 is installed. A fifth branch pipe L5 is connected between the outlet of the second evaporator 21 and the outlet of the second compressor 22, on which a fifth switching valve k5 is installed. A sixth switching valve k6 is installed on the main pipe connecting the first compressor 12 and the first condenser 13. A seventh switching valve k7 is installed on the main pipe connecting the second evaporator 21 and the second compressor 22. An eighth switching valve k8 is installed on the main pipe connecting the second compressor 22 and the second condenser 23.

[0068] In the air conditioning unit provided in the above-described embodiments, the first refrigeration system includes a first evaporator 11, a first compressor 12, a first condenser 13, and a first throttle valve 14 connected in a loop via a main pipeline. The second refrigeration system includes a second evaporator 21, a second compressor 22, a second condenser 23, and a second throttle valve 24 connected in a loop via a main pipeline. To upgrade the piping of the air conditioning unit, a first branch pipeline L1, a second branch pipeline L2, a third branch pipeline L3, a fourth branch pipeline L4, and a fifth branch pipeline L5 are connected between the first and second refrigeration systems. Furthermore, due to the first branch... A first switching valve k1 to a fifth switching valve k5 are respectively installed on the pipeline L1 to the fifth branch pipeline L5. A sixth switching valve k6 is installed on the main pipeline between the first compressor 11 and the first condenser 13. A seventh switching valve k7 is installed on the main pipeline between the second evaporator 21 and the second compressor 22. An eighth switching valve k8 is installed on the main pipeline between the second compressor 22 and the second condenser 23. By controlling the working state of the first switching valve k1 to the eighth switching valve k8, different refrigeration systems can be constructed through the first refrigeration system, the second refrigeration system, and the connected pipelines, allowing the air conditioning unit to flexibly change to multiple operating modes. Specifically, the above-mentioned air conditioning unit allows the first compressor 12 and the second compressor 22 to flexibly switch between parallel and independent operation, thereby increasing the adjustment range of the air conditioning system's cooling capacity. Furthermore, it allows the first evaporator 11 or the second evaporator 21 to flexibly change into an evaporator or a condenser, or even into a reheat compensation heater, thereby increasing the adjustment range of the system's dehumidification capacity without the need for a separate heat compensation mechanism, thus reducing dehumidification heat compensation energy consumption.

[0069] Specifically, in the aforementioned air conditioning unit, the first compressor 12 and the second compressor 22 can be either fixed-frequency compressors or variable-frequency compressors, without limitation. The first switching valve k1 to the eighth switching valve k8 can be a solenoid valve, an electric ball valve, or other switching valve that can shut off and open the pipeline, without limitation. The first throttle valve 14 and the second throttle valve 24 can be electronic expansion valves. The first fan 3 and the second fan 4 can be a single fan or a fan unit composed of multiple fans, without limitation.

[0070] The aforementioned air conditioning unit can be further divided into an indoor unit and an outdoor unit. The first evaporator 11, the second evaporator 21, the first compressor 12, the second compressor 22, the first throttling valve 14, the second throttling valve 24, and the first fan 3 can be installed inside the indoor unit. The indoor unit has a ventilation duct with return air inlets and supply air outlets connecting to the machine room. The first evaporator 11, the second evaporator 21, and the first fan 3 are installed within the ventilation duct. The first condenser 13, the second condenser 23, and the second fan 4 can be installed inside the outdoor unit. The specific components in the indoor and outdoor units can be selected according to actual conditions and are not restricted here.

[0071] The air conditioning unit provided in the above-described embodiments of the invention also includes a controller. The controller is connected to the first compressor 12, the second compressor 22, the first fan 3, the second fan 4, the first throttle valve 14, the second throttle valve 24, the first switching valve k1, the second switching valve k2, the third switching valve k3, the fourth switching valve k4, the fifth switching valve k5, the sixth switching valve k6, the seventh switching valve k7, and the eighth switching valve k8 via signal connection. Specifically, the controller can be used to control the operating states of the first compressor 12, the second compressor 22, the first fan 3, the second fan 4, the first throttle valve 14, the second throttle valve 24, the first switching valve k1, the second switching valve k2, the third switching valve k3, the fourth switching valve k4, the fifth switching valve k5, the sixth switching valve k6, the seventh switching valve k7, and the eighth switching valve k8 according to the dehumidification and cooling requirements of the air conditioning unit, so as to switch the operating mode of the air conditioning unit.

[0072] Specifically, the specific values ​​for the aforementioned dehumidification requirements can be calculated using the relative humidity of the return air at the air outlet, the preset target relative humidity, the humidity dead zone, and the humidity control accuracy. The relative humidity can be collected by a sensor. The specific formula for calculating the dehumidification requirement is as follows: when the collected relative humidity ≥ (preset target relative humidity + humidity dead zone), dehumidification requirement = (collected relative humidity - preset target relative humidity - humidity dead zone) / humidity control accuracy; when the collected relative humidity < (preset target relative humidity - humidity dead zone), dehumidification requirement = (collected relative humidity - preset target relative humidity + humidity dead zone) / temperature control accuracy.

[0073] The specific cooling demand can be calculated using the supplied air temperature at the air outlet, the preset target temperature, the temperature dead zone, and the temperature control accuracy. The supplied air temperature can be collected by a sensor. Specifically, the cooling demand calculation formula is as follows: when the collected supplied air temperature ≥ (preset target temperature + temperature dead zone), cooling demand = (collected supplied air temperature - preset target temperature - temperature dead zone) / temperature control accuracy; when the collected supplied air temperature < (preset target temperature - temperature dead zone), cooling demand = (collected supplied air temperature - preset target temperature + temperature dead zone) / temperature control accuracy. Specifically, when the dehumidification demand is greater than 100%, the dehumidification capacity of the air conditioning unit exceeds the preset dehumidification capacity, requiring strong dehumidification to meet the dehumidification demand; when the cooling demand is greater than 100%, the cooling capacity of the air conditioning unit exceeds the preset cooling capacity, requiring high cooling to meet the cooling demand.

[0074] Specifically, the operating modes of the aforementioned air conditioning units can be categorized into: cooling only without dehumidification; adjustable dehumidification and adjustable cooling; strong dehumidification and adjustable cooling; and adjustable dehumidification and heating. These four preset operating modes can be switched by controlling the operating status of various switching valves within the air conditioning unit, thereby realizing a multi-functional refrigeration system for the air conditioning unit.

[0075] In one specific implementation, the controller is specifically used to: close the first switch valve k1, the second switch valve k2, the third switch valve k3, the fourth switch valve k4, and the fifth switch valve k5, and open the sixth switch valve k6, the seventh switch valve k7, and the eighth switch valve k8 when the dehumidification demand of the air conditioning unit is less than or equal to 0% and the cooling demand is greater than 0%, so that the air conditioning unit operates in a mode of cooling only without dehumidification.

[0076] When the preset operating mode of the air conditioning unit is cooling only without dehumidification, such as Figure 3 As shown, the valves on the dashed lines are in the closed state, while the valves on the solid lines are in the open state. By controlling the first valve k1, the second valve k2, the third valve k3, the fourth valve k4, and the fifth valve k5 to be closed, the first branch pipe L1, the second branch pipe L2, the third branch pipe L3, the fourth branch pipe L4, and the fifth branch pipe L5 are not connected. The first refrigeration system and the second refrigeration system are independent and not connected to each other. The refrigeration system of the air conditioning unit is the same as that of a traditional dual refrigeration system.

[0077] Specifically, when the air conditioning unit operates in the aforementioned cooling-only mode without dehumidification, changes in the cooling capacity of the air conditioning unit can be achieved by adjusting the speeds of the first compressor 12 and the second compressor 22 through the controller, or by controlling the number of operating refrigeration systems. For example, when the cooling demand of the air conditioning unit is low, only one refrigeration system can be controlled to operate, i.e., only the first compressor 12 or only the second compressor 22 can be controlled to operate, so that the air conditioning unit only operates the first refrigeration system or the second refrigeration system. The superheat of the first refrigeration system and the second refrigeration system are adjusted through the first throttle valve 14 and the second throttle valve 24, respectively.

[0078] In another specific implementation, the controller can be specifically used to: close the fifth switch valve k5 and the seventh switch valve k7, and open the first switch valve k1, the second switch valve k2, the third switch valve k3, the fourth switch valve k4, the sixth switch valve k6 and the eighth switch valve k8 when the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100% and the cooling demand is greater than 0%, so that the air conditioning unit can operate in a mode with adjustable dehumidification and adjustable cooling.

[0079] When the air conditioning unit operates in a mode that combines adjustable dehumidification and adjustable cooling, such as Figure 4 As shown, the valves on the dashed lines are in the closed state, and the valves on the solid lines are in the open state. The first valve k1, the second valve k2, the third valve k3, and the fourth valve k4 are opened, so that the first branch pipe L1, the second branch pipe L2, the third branch pipe L3, and the fourth branch pipe L4 are connected. The fifth valve k5 and the seventh valve k7 are closed, so that the main pipe connected to the second evaporator 21 and the fifth branch pipe L5 are not connected. Thus, the first refrigeration system and the second refrigeration system are integrated into one refrigeration system, and the first compressor 12 and the second compressor 22 are connected in parallel through pipes.

[0080] The aforementioned adjustable dehumidification and adjustable cooling operation modes transform a traditional dual-refrigeration system air conditioning unit into a single-refrigeration system unit with two compressors connected in parallel. During the cooling process, the cooling capacity can be adjusted by controlling the speed of the first and second compressors, increasing the adjustment range of the air conditioning system's cooling capacity. Simultaneous heat exchange by both condensers ensures sufficient heat exchange, allowing the discharge pressure of the first compressor 12 and the second compressor 22 to remain relatively low, thus ensuring the unit's energy efficiency. Optionally, while meeting the air conditioning cooling capacity requirements, only one of the two condensers can operate. For example, controlling the sixth switch valve k6 to be closed and the eighth switch valve k8 to be open, or vice versa; the first evaporator 11 and the second evaporator 21 can also use only one of them for heat exchange, reducing the air conditioning unit's energy efficiency. Figure 4The first evaporator 11 is used for heat exchange, but in fact, a switch valve can also be set on the main pipe connected to the first evaporator 11. The switch valve is closed to prevent the main pipe connected to the first evaporator 11 from being connected, while the seventh switch valve k7 is opened to make the main pipe connected to the second evaporator 21 connected, so that the second evaporator 21 can be used for heat exchange.

[0081] In the aforementioned adjustable dehumidification and adjustable cooling operation modes, during the dehumidification process, because the main pipe connected to the second evaporator 21 in the refrigeration system is not connected, the heat exchange area of ​​the evaporator is halved, which will significantly reduce the evaporation temperature and significantly increase the dehumidification capacity of the air conditioning unit, thereby meeting the wet load under various demands. The displacement of the first compressor and the second compressor is the same as that of the air conditioning unit in the traditional dual refrigeration system. Therefore, although the evaporation temperature decreases and the cooling capacity decreases, the cooling capacity of the air conditioning unit can be limited by controlling the working status of the first compressor and the second compressor.

[0082] Specifically, the aforementioned adjustable dehumidification and adjustable cooling modes are suitable for various heat and humidity loads within the computer room where the air conditioning unit is located. When the air conditioning unit is operating in this mode, changes in the cooling and dehumidification requirements can be achieved by adjusting the speeds of the first compressor 12 and the second compressor 22 through the controller. When the cooling demand is low, the controller can also control only the first compressor 12 or only the second compressor 22 to operate, allowing the air conditioning unit to run only the first or second cooling system.

[0083] In another specific implementation, the controller can be specifically used to: close the third switch valve k3, the sixth switch valve k6, and the seventh switch valve k7, and open the first switch valve k1, the second switch valve k2, the fourth switch valve k4, the fifth switch valve k5, and the eighth switch valve k8 when the dehumidification demand of the air conditioning unit is greater than 100% and the cooling demand is greater than or equal to 0%, so that the air conditioning unit can operate in a mode with strong dehumidification and adjustable cooling.

[0084] When the air conditioning unit operates in the above-mentioned strong dehumidification and adjustable cooling modes, such as Figure 5As shown, the valves on the dashed lines are in the closed state, while those on the solid lines are in the open state. The controller closes the seventh valve k7, discontinuing the main pipeline connecting the second evaporator 21 and the second compressor 22. It also opens the first and second valves k1 and k2, connecting the first compressor 12 and the second compressor 22 in parallel via pipelines, effectively forming a single refrigeration system. During simultaneous cooling and dehumidification, the fifth branch pipeline L5 is opened by controlling the fifth valve k5, connecting the exhaust outlet of the second compressor 22 to the second evaporator 21. This transforms the second evaporator 21 into a condenser, effectively dissipating heat into the room. The heat dissipation from the second evaporator 21 allows for different proportions of indoor heat compensation, enabling adjustment of the air conditioning unit's cooling capacity even under low load conditions, thus allowing the actual indoor cooling capacity to be adjusted from 0-100%. At this time, since the heat dissipation through the second evaporator 21 achieves indoor heat compensation under low load, there is no need to consider the mismatch between the unit's cooling capacity and dehumidification capacity and the room's heat-moisture ratio line. The first evaporator 11 in the indoor unit can achieve extremely strong dehumidification capacity.

[0085] Specifically, when the air conditioning unit operates in a mode with adjustable dehumidification and cooling, the controller in the unit can control both the first compressor 12 and the second compressor 22 to be turned on and run at a fixed speed. Changes in cooling demand can be adjusted by controlling the speed of the second fan 4. For example, when the cooling demand is high, the outdoor second fan 4 is controlled at a high speed, at which point the heat dissipation of the indoor second evaporator 21 is small, and the overall cooling capacity provided by the air conditioning unit is large. When the cooling demand is low, the outdoor second fan 4 is controlled at a low speed, at which point the heat dissipation of the indoor second evaporator 21 is large, and the overall cooling capacity provided by the air conditioning unit is small. In this mode, the air conditioning unit does not require a separate heating compensation mechanism, thus avoiding increased system power consumption and energy waste.

[0086] Furthermore, the fifth switch valve k5, the sixth switch valve k6, and the eighth switch valve k8 can be switch valves with adjustable opening. When the air conditioning unit is operating in a mode with adjustable dehumidification and cooling, the controller can specifically be used to adjust the opening of the fifth switch valve, the sixth switch valve, and the eighth switch valve according to the cooling capacity or the compensating heating capacity during dehumidification.

[0087] Specifically, the exhaust from the first compressor 12 and the second compressor 22 flows into the second condenser 23 and the second evaporator 21 through the fifth switching valve k5 and the eighth switching valve k8. By adjusting the opening degrees of the fifth switching valve k5 and the eighth switching valve k8, the compressor exhaust can be distributed according to demand, thereby adjusting the heat compensation amount of the refrigeration system. For example, when the air conditioning unit is dehumidifying and the required compensation heating amount is large, the opening degree of the fifth switching valve k5 can be increased and the opening degree of the eighth switching valve k8 can be decreased. Conversely, when the required compensation heating amount is small during dehumidification, the opening degree of the fifth switching valve k5 can be decreased and the opening degree of the eighth switching valve k8 can be increased. This allows for stepless adjustment of the compensation heating amount. Even in the case of no dehumidification and pure cooling, the cooling capacity can be steplessly adjusted from 0% to 100% by adjusting the opening degrees of the fifth switching valve k5 and the eighth switching valve k8. In addition, the sixth switch valve k6 can also participate, and the third switch valve k3 can also be opened. By adjusting the opening degree of the sixth switch valve k6, an appropriate amount of compressor exhaust can be discharged into the first condenser 13, so that the first condenser 13 can also participate in refrigeration.

[0088] In another specific implementation, the controller is specifically used to: close the third switch valve k3, the sixth switch valve k6, the seventh switch valve k7, and the eighth switch valve k8, and open the first switch valve k1, the second switch valve k2, the fourth switch valve k4, and the fifth switch valve k5 when the dehumidification demand of the air conditioning unit is greater than 0% and the cooling demand is less than 0%, so that the air conditioning unit can operate in a dehumidification and heating mode.

[0089] When the air conditioning unit is running in dehumidification and heating modes, such as Figure 6 As shown, the valves on the dashed lines are in the closed state, while those on the solid lines are in the open state. The controller closes the sixth valve (k6) and the eighth valve (k8), preventing the main pipeline connecting the first condenser 13 and the second condenser 23 from being open. It also opens the fifth valve (k5) and closes the seventh valve (k7), preventing the main pipeline between the second evaporator 21 and the second compressor 22 from being open, while maintaining the outlet for exhaust from the second evaporator 21 and the second compressor 22. The controller opens the first valve (k1) and the second valve (k2), connecting the first compressor 12 and the second compressor 22 in parallel. The second evaporator 21 can be used as a condenser, while the first evaporator 11 continues to function as an evaporator for heat exchange with the indoor return air, achieving cooling and dehumidification. When the air conditioning unit operates in the above-mentioned adjustable dehumidification and heating modes, the first evaporator 11 ensures strong dehumidification, and the second evaporator 21 recovers all the heat from the indoor return air. In fact, the recovered heat is greater than the cooling capacity of the air conditioning unit, ensuring sufficient dehumidification even when there is no cooling demand. The above-mentioned adjustable dehumidification and heating modes are equivalent to a dehumidifier, suitable for situations where the computer room has no cooling load requirement but a strong dehumidification need.

[0090] Specifically, when the dehumidification demand of the air conditioning unit is greater than 0% and the cooling demand is less than 0%, the cooling demand being less than 0% means that there is a heating effect on the room. In this mode, dehumidification can be adjusted by changing the compressor speed or the number of compressors running.

[0091] In the air conditioning unit provided by the above-described embodiments, by switching between different preset operating modes, high dehumidification and system cooling capacity adjustment from 0% to 100% can be achieved, enhancing the applicability of the air conditioning unit. The aforementioned air conditioning unit can also be used in conjunction with traditional dual-cooling system operating modes, enabling it to adapt to a wider range of heat-to-moisture ratios, such as high cooling and low humidity, high cooling and high humidity, low cooling and low humidity, and low cooling and high humidity.

[0092] In the air conditioning unit provided in the embodiments of the present invention, the first refrigeration system may further include a first one-way valve 15, a second one-way valve 16 and a first refrigerant pump 17, and the second refrigeration system may further include a third one-way valve 25, a fourth one-way valve 26 and a second refrigerant pump 27.

[0093] like Figure 7 As shown, the first check valve 15 is connected in parallel with the first compressor 12 via the sixth branch pipe L6; the second check valve 16 is located on the main pipe between the first condenser 13 and the first throttle valve 14; the first refrigerant pump 17 is connected in parallel with the second check valve 16 via the seventh branch pipe L7; the third check valve 25 is connected between the outlet of the second evaporator 21 and the inlet of the second condenser 23 via the eighth branch pipe L8; the fourth check valve 26 is located on the main pipe between the second condenser 23 and the second throttle valve 24; and the second refrigerant pump 27 is connected in parallel with the fourth check valve 26 via the ninth branch pipe L9. The outlet of the first evaporator 11 and... A ninth switching valve k9 is provided on the main pipeline connecting the first compressor 12 and the first check valve 15. A tenth switching valve k10 is provided on the main pipeline connecting the outlet of the first condenser 13 to the second check valve 16 and the first refrigerant pump 17. The outlet of the second condenser 23 is connected to the third branch pipeline L3 and the ninth branch pipeline L9 through the tenth branch pipeline L10. An eleventh switching valve k11 is provided on the tenth branch pipeline L10. The inlet of the second throttle valve 24 is connected to the fourth branch pipeline L4 and the ninth branch pipeline L9 through the eleventh branch pipeline L11. A twelfth switching valve k12 is provided on the eleventh branch pipeline L11.

[0094] The controller can be connected to the first refrigerant pump 17, the second refrigerant pump 27, the ninth switch valve k9, the tenth switch valve k10, the eleventh switch valve k11, and the twelfth switch valve k12. Specifically, the controller is used to control the operating status of the first refrigerant pump 17, the second refrigerant pump 27, the ninth switch valve k9, the tenth switch valve k10, the eleventh switch valve k11, and the twelfth switch valve k12 according to the dehumidification and cooling requirements of the air conditioning unit, so as to switch the operating mode of the air conditioning unit.

[0095] In the air conditioning unit provided by the above-described embodiments of the invention, the different operating modes of the air conditioning unit can also be realized by controlling the working state of each switching valve through the controller.

[0096] In one specific implementation, such as Figure 8 As shown, when the dehumidification demand of the air conditioning unit is less than or equal to 0% and the cooling demand is greater than 0%, the controller can be used to close the first switching valve k1, the second switching valve k2, the third switching valve k3, the fourth switching valve k4, and the fifth switching valve k5, while opening the other switching valves. This prevents the first branch pipe L1, the second branch pipe L2, the third branch pipe L3, the fourth branch pipe L4, and the fifth branch pipe L5 from conducting. The first refrigeration system and the second refrigeration system are independent and not connected to each other. At this time, the air conditioning unit's refrigeration system can realize a refrigeration system with two independent compressors and integrated refrigerant pumps. The air conditioning unit operates in a mode of no dehumidification and only cooling.

[0097] Figure 8 In the refrigeration system of the air conditioning unit shown, the first refrigeration system and the second refrigeration system are independent of each other. Each refrigeration system can control the operation of the first compressor 12 and the second compressor 22 through a controller, while the first refrigerant pump 17 and the second refrigerant pump 27 are not operating, thus achieving refrigeration through the two compressors. For example, as shown... Figure 9 As shown, by controlling the first switching valve k1, the second switching valve k2, the third switching valve k3, the fourth switching valve k4, the fifth switching valve k5, the eleventh switching valve k11, and the twelfth switching valve k12 to close, and the other switching valves to open, refrigeration can be achieved through the first compressor 12 and the second compressor 22; or one compressor and one refrigerant pump can be controlled to operate, while the other compressors and refrigerant pumps are not operating, for example, as... Figure 10 As shown, by controlling the first switching valve k1, the second switching valve k2, the third switching valve k3, the fourth switching valve k4, the fifth switching valve k5, the eighth switching valve k8, and the seventh switching valve k7 to close, and the other switching valves to open, and controlling the first compressor 12 and the second refrigerant pump 27 to work, refrigeration can be achieved through one compressor and one refrigerant pump; or, if the indoor and outdoor temperature difference allows, the first refrigerant pump 17 and the second refrigerant pump 27 can be controlled to work, while the first compressor 12 and the second compressor 22 are not working, achieving refrigeration through two refrigerant pumps, thereby saving energy. Figure 11As shown, the first switching valve k1, the second switching valve k2, the third switching valve k3, the fourth switching valve k4, the fifth switching valve k5, the seventh switching valve k7, and the eighth switching valve k8 are closed, while the other switching valves are opened. The first fluorine pump 17 and the second fluorine pump 27 are also controlled to work, so that the two fluorine pumps can be used for refrigeration.

[0098] In another specific implementation, such as Figure 12 As shown, when the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the controller can control the fourth switch valve k4, the fifth switch valve k5, the seventh switch valve k7, and the twelfth switch valve k12 to close, while other switch valves are opened, thus obtaining a refrigeration system with adjustable dehumidification and adjustable cooling, so that the air conditioning unit can operate in a mode with adjustable dehumidification and adjustable cooling.

[0099] In another specific implementation, such as Figure 13 As shown, when the dehumidification demand of the air conditioning unit is greater than 100% and the cooling demand is greater than or equal to 0%, the controller can control the third switch valve k3, the sixth switch valve k6, the seventh switch valve k7, the tenth switch valve k10 and the eleventh switch valve k11 to close, and the other switch valves to open, so as to obtain a strong dehumidification and cooling adjustable refrigeration system, so that the air conditioning unit can operate in a strong dehumidification and cooling adjustable mode.

[0100] In another specific implementation, such as Figure 14 As shown, when the dehumidification demand of the air conditioning unit is greater than 0% and the cooling demand is less than 0%, the controller can control the third switch valve k3, the sixth switch valve k6, the seventh switch valve k7, the eighth switch valve k8, the tenth switch valve k10, and the eleventh switch valve k11 to close, while other switch valves are opened, thus obtaining a dehumidification and heating refrigeration system, so that the air conditioning unit can operate in a dehumidification and heating mode.

[0101] In the air conditioning unit provided by the above-described embodiments, when the first refrigerant pump 17 and the second refrigerant pump 27 are included, the air conditioning unit not only has the above four preset operating modes, but also has natural cooling, strong dehumidification and high cooling modes.

[0102] In one specific implementation, the controller is specifically used to: open the first switching valve k1, the second switching valve k2, the sixth switching valve k6, the ninth switching valve k9, the tenth switching valve k10, the eleventh switching valve k11, and the twelfth switching valve k12, and close the third switching valve k3, the fourth switching valve k4, the fifth switching valve k5, the seventh switching valve k7, and the eighth switching valve k8 when the outdoor temperature is lower than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 100%, and the cooling demand is greater than 100%, so that the air conditioning unit operates in natural cooling, strong dehumidification, and high cooling modes.

[0103] The indoor temperature can be either the temperature inside the computer room or the temperature at the return air vent of the indoor unit; there are no restrictions here. Both the indoor and outdoor temperatures can be measured using temperature sensors.

[0104] When the air conditioning unit is running in natural cooling, strong dehumidification, and high cooling modes, such as Figure 15 As shown, since the controller controls the third switching valve k3, the fourth switching valve k4, the fifth switching valve k5, the seventh switching valve k7, and the eighth switching valve k8 to close, two different refrigeration systems can be formed. The first refrigeration system has a second evaporator 21, a third one-way valve 25, a second condenser 23, a second refrigerant pump 27, and a second throttle valve 24, and can use the refrigerant pump to utilize natural cooling. The second refrigeration system has a first evaporator 11, a first compressor 12, a second compressor 22, a first condenser 13, a second one-way valve 16, and a first throttle valve 14. The first compressor 12 and the second compressor 22 are connected in parallel, which can achieve a high cooling and strong dehumidification mode. Therefore, the preset operating mode of the air conditioner is: natural cooling, strong dehumidification, and high cooling mode.

[0105] In the aforementioned natural cooling, strong dehumidification, and high cooling modes, the first compressor 12 and the second compressor 22 can be variable frequency compressors. The cooling capacity can be adjusted by controlling the speed of the first compressor 12 and the second compressor 22, or both compressors can be operated simultaneously or one can operate at a time, depending on the required cooling capacity of the unit. The intervention of natural cooling reduces the cooling capacity required by the compressors, thus this mode has an energy-saving effect. This mode is suitable for situations with high heat and humidity loads, where natural cooling can be partially utilized.

[0106] In the air conditioning unit provided in the embodiments of the present invention, such as Figure 16 As shown, it may also include a thirteenth switching valve k13, a fourteenth switching valve k14, and a fifteenth switching valve k15. The thirteenth switching valve k13 is installed on the ninth branch pipe L9 between the outlet of the second condenser 23 and the fourth check valve 26. The twelfth branch pipe L12 is connected between the outlet of the second condenser 23 and the outlet of the second refrigerant pump 27. The fourteenth switching valve k14 is installed on the twelfth branch pipe L12. The thirteenth branch pipe L13 is connected between the inlet of the second refrigerant pump 27 and the inlet of the second throttle valve 24. The fifteenth switching valve k15 is installed on the thirteenth branch pipe L13.

[0107] The controller is connected to the thirteenth switch valve k13, the fourteenth switch valve k14, and the fifteenth switch valve k15. The controller is used to control the working status of the thirteenth switch valve k13, the fourteenth switch valve k14, and the fifteenth switch valve k15 according to the dehumidification and cooling requirements of the air conditioning unit, so as to switch the operating mode of the air conditioning unit.

[0108] In the air conditioning unit provided by the above-described embodiments of the invention, when the controller controls the fourteenth switch valve k14 and the fifteenth switch valve k15 to close and the thirteenth switch valve k13 to open, the controller can control the different opening and closing states of other switch valves, enabling the air conditioning unit to operate in the above-described modes of cooling only without dehumidification, adjustable dehumidification and adjustable cooling, strong dehumidification and adjustable cooling, adjustable dehumidification and heating, and natural cooling, strong dehumidification and high cooling modes.

[0109] When the fourteenth and fifteenth switch valves k14 and k15 are opened and the thirteenth switch valve k13 is closed, the air conditioning unit can also operate in heat recovery and cooling modes.

[0110] In another specific embodiment, the controller is specifically used to: close the first switch valve k1, the second switch valve k2, the third switch valve k3, the fourth switch valve k4, the seventh switch valve k7, the eleventh switch valve k11, the twelfth switch valve k12, and the thirteenth switch valve k13, and open the fifth switch valve k5, the sixth switch valve k6, the eighth switch valve k8, the ninth switch valve k9, the tenth switch valve k10, the fourteenth switch valve k14, and the fifteenth switch valve k15 when the outdoor temperature is higher than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, so that the air conditioning unit operates in pump heat recovery and cooling mode.

[0111] When the air conditioning unit is operating in pump heat recovery and cooling mode, such as Figure 17As shown, by controlling the closure of the first switching valve k1, second switching valve k2, third switching valve k3, fourth switching valve k4, seventh switching valve k7, eleventh switching valve k11, twelfth switching valve k12, and thirteenth switching valve k13, two different refrigeration systems can be formed. The first refrigeration system includes a second evaporator 21, a second condenser 23, and a second refrigerant pump 27. Because the fourteenth switching valve k14 and the fifteenth switching valve k15 are open, the second refrigerant pump 27 can reverse its direction. When the indoor temperature is lower than the outdoor temperature, the indoor second evaporator 21 acts as a condenser, and the condensed refrigerant is pressurized by the pump to the outdoor second condenser 23 (which then acts as an evaporator). This allows heat to be absorbed from the outside into the indoor system through pump circulation. The second refrigeration system includes a first evaporator 11, a first compressor 12, a first condenser 13, a second one-way valve 16, and a first throttling valve 14. This refrigeration system operates normally. Therefore, the above-mentioned air conditioning unit can achieve a pump heat recovery and refrigeration operation mode. When the compressor over-cools during dehumidification, the temperature compensation for dehumidification can be achieved by operating the air conditioning unit in this mode, which can realize stepless adjustment of cooling capacity.

[0112] Based on the same inventive concept, this invention also provides an operation control method for an air conditioning unit, applicable to any of the air conditioning units provided in the above technical solutions, such as... Figure 18 As shown, the operation control method includes the following steps:

[0113] S1801: Obtain the dehumidification and cooling requirements of the air conditioning unit;

[0114] S1802: Based on the dehumidification and cooling requirements of the air conditioning unit, control the working status of the first compressor, second compressor, first fan, second fan, first throttle valve, second throttle valve, first switching valve, second switching valve, third switching valve, fourth switching valve, fifth switching valve, sixth switching valve, seventh switching valve, and eighth switching valve to switch the operating mode of the air conditioning unit.

[0115] The air conditioning unit operation control method provided in this invention can construct different refrigeration systems through the first and second refrigeration systems and connected pipelines by controlling the working states of the first to eighth switching valves, enabling the air conditioning unit to flexibly switch between multiple operating modes. Specifically, it allows the first and second compressors to flexibly switch between parallel and independent operation, thereby increasing the adjustment range of the air conditioning system's cooling capacity; furthermore, it allows the first or second evaporator to flexibly switch between an evaporator or a condenser, or even a reheat compensation heater, thereby increasing the system's dehumidification capacity adjustment range without the need for a separate heat compensation mechanism, thus reducing dehumidification heat compensation energy consumption.

[0116] Optionally, the operation control method includes:

[0117] When the dehumidification demand of the air conditioning unit is less than or equal to 0% and the cooling demand is greater than 0%, the first, second, third, fourth, and fifth switch valves are closed, and the sixth, seventh, and eighth switch valves are opened, so that the air conditioning unit operates in a mode of cooling only without dehumidification.

[0118] Optionally, the operation control method includes:

[0119] When the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the fifth and seventh switch valves are controlled to close, and the first, second, third, fourth, sixth, and eighth switch valves are controlled to open, so that the air conditioning unit can operate in a mode with adjustable dehumidification and adjustable cooling.

[0120] Optionally, the operation control method includes:

[0121] When the dehumidification demand of the air conditioning unit is greater than 100% and the cooling demand is greater than or equal to 0%, the third, sixth, and seventh switching valves are closed, and the first, second, fourth, fifth, and eighth switching valves are opened, so that the air conditioning unit can operate in a mode with strong dehumidification and adjustable cooling.

[0122] Optionally, the fifth, sixth, and eighth switching valves are adjustable-opening switching valves; the operation control method includes:

[0123] The opening degrees of the fifth, sixth, and eighth switching valves are adjusted according to the cooling capacity or the compensating heating capacity during dehumidification.

[0124] Optionally, the operation control method includes:

[0125] When the dehumidification demand of the air conditioning unit is greater than 0% and the cooling demand is less than 0%, the third, sixth, seventh, and eighth switch valves are closed, and the first, second, fourth, and fifth switch valves are opened, so that the air conditioning unit can operate in a dehumidification and heating mode.

[0126] Optionally, when the first refrigeration system further includes a first check valve, a second check valve, and a first refrigerant pump, and the second refrigeration system further includes a third check valve, a fourth check valve, and a second refrigerant pump, the operation control method includes:

[0127] Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the first refrigerant pump, the second refrigerant pump, the ninth switching valve, the tenth switching valve, the eleventh switching valve, and the twelfth switching valve are controlled to switch the operating mode of the air conditioning unit.

[0128] Optionally, the operation control method includes:

[0129] When the outdoor temperature is lower than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 100%, and the cooling demand is greater than 100%, the first, second, sixth, ninth, tenth, eleventh, and twelfth switch valves are opened, and the third, fourth, fifth, seventh, and eighth switch valves are closed, so that the air conditioning unit operates in natural cooling, strong dehumidification, and high cooling modes.

[0130] Optionally, when the air conditioning unit further includes a thirteenth switching valve, a fourteenth switching valve, and a fifteenth switching valve, the operation control method includes:

[0131] Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the thirteenth, fourteenth, and fifteenth switching valves are controlled to switch the operating modes of the air conditioning unit.

[0132] Optionally, the operation control method includes:

[0133] When the outdoor temperature is higher than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the first, second, third, fourth, seventh, eleventh, twelfth, and thirteenth switch valves are closed, while the fifth, sixth, eighth, ninth, tenth, fourteenth, and fifteenth switch valves are opened, so that the air conditioning unit operates in a heat recovery and cooling mode.

[0134] Based on the same inventive concept, the present invention also provides an operation control device for an air conditioning unit, such as... Figure 19 As shown, it includes:

[0135] The acquisition unit 100 is used to acquire the dehumidification and cooling requirements of the air conditioning unit.

[0136] The control unit 200 is used to control the working status of the first compressor, the second compressor, the first fan, the second fan, the first throttle valve, the second throttle valve, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, the fifth switching valve, the sixth switching valve, the seventh switching valve, and the eighth switching valve according to the dehumidification and cooling requirements of the air conditioning unit, so as to switch the operating mode of the air conditioning unit.

[0137] The air conditioning unit operation control device provided in this embodiment of the invention can construct different refrigeration systems through the first refrigeration system, the second refrigeration system, and the connected pipelines by controlling the working state of the first to the eighth switching valves, enabling the air conditioning unit to flexibly change to multiple operating modes. Specifically, it allows the first compressor and the second compressor to flexibly switch between parallel and independent operation, thereby increasing the adjustment range of the air conditioning system's cooling capacity; furthermore, it allows the first evaporator or the second evaporator to flexibly change into an evaporator or a condenser, or even into a reheat compensation heater, thereby increasing the system's dehumidification capacity adjustment range without the need for a separate heat compensation mechanism, thus reducing dehumidification heat compensation energy consumption.

[0138] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. An air conditioning unit, characterized in that, The system includes a first refrigeration system, a second refrigeration system, a first fan, and a second fan. The first refrigeration system includes a first evaporator, a first compressor, a first condenser, and a first expansion valve, all connected in a loop via a main pipeline. The second refrigeration system includes a second evaporator, a second compressor, a second condenser, and a second expansion valve, all connected in a loop via a main pipeline. The first fan corresponds to the first evaporator and the second evaporator, and the second fan corresponds to the first condenser and the second condenser. A first branch pipe is connected between the outlet of the first evaporator and the inlet of the second compressor, and a first switching valve is installed on the first branch pipe. A second branch pipe is connected between the outlet of the first compressor and the outlet of the second compressor, and a second switching valve is installed on the second branch pipe. A third branch pipe is connected between the outlet of the first condenser and the outlet of the second condenser, and a third switching valve is installed on the third branch pipe. A fourth branch pipe is connected between the inlet of the first throttle valve and the inlet of the second throttle valve, and a fourth switching valve is installed on the fourth branch pipe. A fifth branch pipe is connected between the outlet of the second evaporator and the outlet of the second compressor, and a fifth switching valve is installed on the fifth branch pipe. A sixth switching valve is installed on the main pipe connecting the first compressor and the first condenser. A seventh switching valve is installed on the main pipe connecting the second evaporator and the second compressor. An eighth switching valve is installed on the main pipe connecting the second compressor and the second condenser. The air conditioning unit is divided into an indoor unit and an outdoor unit. The indoor unit has a ventilation duct with a return air inlet and a supply air inlet communicating with the indoor unit. The first evaporator, the second evaporator and the first fan are disposed in the ventilation duct, and the first condenser, the second condenser and the second fan are disposed in the outdoor unit. The second refrigeration system also includes a third check valve, a fourth check valve, and a second refrigerant pump; the third check valve is connected between the outlet of the second evaporator and the inlet of the second condenser through an eighth branch pipeline; the fourth check valve is located on the main pipeline between the second condenser and the second throttle valve; and the second refrigerant pump is connected in parallel with the fourth check valve through a ninth branch pipeline. It also includes a thirteenth switching valve, a fourteenth switching valve, and a fifteenth switching valve. The thirteenth switching valve is installed on the ninth branch pipe between the outlet of the second condenser and the fourth check valve. A twelfth branch pipe is connected between the outlet of the second condenser and the outlet of the second refrigerant pump, and the fourteenth switching valve is installed on the twelfth branch pipe. A thirteenth branch pipe is connected between the inlet of the second refrigerant pump and the inlet of the second throttle valve, and the fifteenth switching valve is installed on the thirteenth branch pipe.

2. The air conditioning unit as described in claim 1, characterized in that, It also includes a controller, which is signal-connected to the first compressor, the second compressor, the first fan, the second fan, the first throttle valve, the second throttle valve, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, the fifth switching valve, the sixth switching valve, the seventh switching valve, and the eighth switching valve; the controller is used for: Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the first compressor, second compressor, first fan, second fan, first throttle valve, second throttle valve, first switching valve, second switching valve, third switching valve, fourth switching valve, fifth switching valve, sixth switching valve, seventh switching valve, and eighth switching valve are controlled to switch the operating mode of the air conditioning unit.

3. The air conditioning unit as described in claim 2, characterized in that, The controller is specifically used for: When the dehumidification demand of the air conditioning unit is less than or equal to 0% and the cooling demand is greater than 0%, the first, second, third, fourth, and fifth switch valves are closed, and the sixth, seventh, and eighth switch valves are opened, so that the air conditioning unit operates in a mode of cooling only without dehumidification.

4. The air conditioning unit as described in claim 2, characterized in that, The controller is specifically used for: When the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the fifth and seventh switch valves are controlled to close, and the first, second, third, fourth, sixth, and eighth switch valves are controlled to open, so that the air conditioning unit can operate in a mode with adjustable dehumidification and adjustable cooling.

5. The air conditioning unit as described in claim 2, characterized in that, The controller is specifically used for: When the dehumidification demand of the air conditioning unit is greater than 100% and the cooling demand is greater than or equal to 0%, the third, sixth, and seventh switch valves are closed, and the first, second, fourth, fifth, and eighth switch valves are opened, so that the air conditioning unit can operate in a mode with strong dehumidification and adjustable cooling.

6. The air conditioning unit as described in claim 5, characterized in that, The fifth, sixth, and eighth switching valves are adjustable-opening switching valves; the controller is specifically used for: The opening degrees of the fifth, sixth, and eighth switching valves are adjusted according to the cooling capacity or the compensating heating capacity during dehumidification.

7. The air conditioning unit as described in claim 2, characterized in that, The controller is specifically used for: When the dehumidification demand of the air conditioning unit is greater than 0% and the cooling demand is less than 0%, the third, sixth, seventh, and eighth switch valves are closed, and the first, second, fourth, and fifth switch valves are opened, so that the air conditioning unit can operate in a dehumidification and heating mode.

8. The air conditioning unit as described in claim 2, characterized in that, The first refrigeration system also includes a first check valve, a second check valve, and a first refrigerant pump; The first check valve is connected in parallel to the first compressor via a sixth branch pipeline; the second check valve is located on the main pipeline between the first condenser and the first throttle valve; and the first refrigerant pump is connected in parallel to the second check valve via a seventh branch pipeline. A ninth switching valve is provided on the main pipeline connecting the outlet of the first evaporator to the first compressor and the first check valve; a tenth switching valve is provided on the main pipeline connecting the outlet of the first condenser to the second check valve and the first refrigerant pump; the outlet of the second condenser is connected to the third branch pipeline and the ninth branch pipeline via the tenth branch pipeline; an eleventh switching valve is provided on the tenth branch pipeline; the inlet of the second throttle valve is connected to the fourth branch pipeline and the ninth branch pipeline via the eleventh branch pipeline; and a twelfth switching valve is provided on the eleventh branch pipeline. The controller is signal-connected to the first fluorine pump, the second fluorine pump, the ninth switching valve, the tenth switching valve, the eleventh switching valve, and the twelfth switching valve. Specifically, the controller is used for: Based on the dehumidification and cooling requirements of the air conditioning unit, the operating status of the first refrigerant pump, the second refrigerant pump, the ninth switching valve, the tenth switching valve, the eleventh switching valve, and the twelfth switching valve are controlled to switch the operating mode of the air conditioning unit.

9. The air conditioning unit as described in claim 8, characterized in that, The controller is specifically used for: When the outdoor temperature is lower than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 100%, and the cooling demand is greater than 100%, the first, second, sixth, ninth, tenth, eleventh, and twelfth switch valves are opened, and the third, fourth, fifth, seventh, and eighth switch valves are closed, so that the air conditioning unit operates in natural cooling, strong dehumidification, and high cooling modes.

10. The air conditioning unit as described in claim 8, characterized in that, The controller is connected to the thirteenth, fourteenth, and fifteenth switching valves, and the controller is used for: Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the thirteenth, fourteenth, and fifteenth switching valves are controlled to switch the operating modes of the air conditioning unit.

11. The air conditioning unit as described in claim 10, characterized in that, The controller is specifically used for: When the outdoor temperature is higher than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the first, second, third, fourth, seventh, eleventh, twelfth, and thirteenth switch valves are closed, while the fifth, sixth, eighth, ninth, tenth, fourteenth, and fifteenth switch valves are opened, so that the air conditioning unit operates in a heat recovery and cooling mode.

12. A method for controlling the operation of an air conditioning unit, characterized in that, Applied to an air conditioning unit as described in any one of claims 1-11, comprising: Obtain the dehumidification and cooling requirements of the air conditioning unit; Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the first compressor, second compressor, first fan, second fan, first throttle valve, second throttle valve, first switching valve, second switching valve, third switching valve, fourth switching valve, fifth switching valve, sixth switching valve, seventh switching valve, and eighth switching valve are controlled to switch the operating mode of the air conditioning unit.

13. The operation control method as described in claim 12, characterized in that, include: When the dehumidification demand of the air conditioning unit is less than or equal to 0% and the cooling demand is greater than 0%, the first, second, third, fourth, and fifth switch valves are closed, and the sixth, seventh, and eighth switch valves are opened, so that the air conditioning unit operates in a mode of cooling only without dehumidification.

14. The operation control method as described in claim 12, characterized in that, include: When the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the fifth and seventh switch valves are controlled to close, and the first, second, third, fourth, sixth, and eighth switch valves are controlled to open, so that the air conditioning unit can operate in a mode with adjustable dehumidification and adjustable cooling.

15. The operation control method as described in claim 12, characterized in that, include: When the dehumidification demand of the air conditioning unit is greater than 100% and the cooling demand is greater than or equal to 0%, the third, sixth, and seventh switch valves are closed, and the first, second, fourth, fifth, and eighth switch valves are opened, so that the air conditioning unit can operate in a mode with strong dehumidification and adjustable cooling.

16. The operation control method as described in claim 15, characterized in that, The fifth, sixth, and eighth switching valves are adjustable-opening switching valves; the operation control method includes: The opening degrees of the fifth, sixth, and eighth switching valves are adjusted according to the cooling capacity or the compensating heating capacity during dehumidification.

17. The operation control method as described in claim 12, characterized in that, include: When the dehumidification demand of the air conditioning unit is greater than 0% and the cooling demand is less than 0%, the third, sixth, seventh, and eighth switch valves are closed, and the first, second, fourth, and fifth switch valves are opened, so that the air conditioning unit can operate in a dehumidification and heating mode.

18. The operation control method as described in claim 12, characterized in that, When the first refrigeration system further includes a first check valve, a second check valve, and a first refrigerant pump, and the second refrigeration system further includes a third check valve, a fourth check valve, and a second refrigerant pump, the operation control method includes: Based on the dehumidification and cooling requirements of the air conditioning unit, the operating status of the first refrigerant pump, the second refrigerant pump, the ninth switching valve, the tenth switching valve, the eleventh switching valve, and the twelfth switching valve are controlled to switch the operating mode of the air conditioning unit.

19. The operation control method as described in claim 18, characterized in that, include: When the outdoor temperature is lower than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 100%, and the cooling demand is greater than 100%, the first, second, sixth, ninth, tenth, eleventh, and twelfth switch valves are opened, and the third, fourth, fifth, seventh, and eighth switch valves are closed, so that the air conditioning unit operates in natural cooling, strong dehumidification, and high cooling modes.

20. The operation control method as described in claim 18, characterized in that, When the air conditioning unit also includes a thirteenth switching valve, a fourteenth switching valve, and a fifteenth switching valve, the operation control method includes: Based on the dehumidification and cooling requirements of the air conditioning unit, the operating states of the thirteenth, fourteenth, and fifteenth switching valves are controlled to switch the operating modes of the air conditioning unit.

21. The operation control method as described in claim 20, characterized in that, include: When the outdoor temperature is higher than the indoor temperature, the dehumidification demand of the air conditioning unit is greater than 0% and less than or equal to 100%, and the cooling demand is greater than 0%, the first, second, third, fourth, seventh, eleventh, twelfth, and thirteenth switch valves are closed, while the fifth, sixth, eighth, ninth, tenth, fourteenth, and fifteenth switch valves are opened, so that the air conditioning unit operates in pump heat recovery and cooling mode.

22. An operation control device for an air conditioning unit, characterized in that, Applied to an air conditioning unit as described in any one of claims 1-11, comprising: The acquisition unit is used to acquire the dehumidification and cooling requirements of the air conditioning unit. The control unit is used to control the operating status of the first compressor, the second compressor, the first fan, the second fan, the first throttle valve, the second throttle valve, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, the fifth switching valve, the sixth switching valve, the seventh switching valve, and the eighth switching valve according to the dehumidification and cooling requirements of the air conditioning unit, so as to switch the operating mode of the air conditioning unit.

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