Heat pump air conditioning system, control method and control device for heat pump air conditioning system

Abstract

This invention provides a heat pump air conditioning system, a control method for the heat pump air conditioning system, and a control device for the heat pump air conditioning system. The heat pump air conditioning system includes multiple indoor units composed of several indoor water-cooled units and several indoor refrigerant units, all of which are connected in parallel and share a single outdoor unit. The method includes: receiving a signal to control the system to enter defrost mode; obtaining the proportion of the total rated capacity of all indoor water-cooled units to the total rated capacity of the indoor units; generating execution logic based on the proportion of water-cooled unit capacity; and controlling and adjusting the operating state of the indoor water-cooled units in defrost mode according to the execution logic. The control method and control device of this invention incorporate a water-cooled unit capacity proportion coefficient as a criterion for switching defrost control programs, and control the indoor water-cooled units to maintain different operating states in different defrost control programs, thereby achieving thorough defrosting of the outdoor unit, reducing the risk of freezing and cracking of the indoor water-cooled units, and promoting stable and efficient operation of the system.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to heat pump air conditioning systems, control methods for heat pump air conditioning systems, and control devices for heat pump air conditioning systems. Background Technology

[0002] In related technologies, air conditioner frost increases the thermal resistance of the heat exchanger, which leads to a decrease in the air conditioner's heat exchange capacity. The commonly used defrosting method is reverse cooling defrosting, which means that when the control module detects that the air conditioner meets the defrosting conditions, the four-way valve switches the refrigerant flow direction, switching from heating mode to cooling mode, and the outdoor heat exchanger dissipates heat to perform defrosting.

[0003] In air conditioning systems that combine refrigerant-based and water-based systems, water flows through the water-based system. This water may freeze at low temperatures, potentially causing the water-based system's heat exchanger to crack. Therefore, it's understandable that in defrost mode, if the water-based system participates in the defrost cycle, the risk of the heat exchanger freezing and cracking is higher. However, if the water-based system does not participate in the defrost cycle (i.e., its electronic expansion valve is closed to prevent it from participating in the defrost process), the outdoor unit's evaporation capacity may be insufficient, resulting in incomplete defrosting and making it difficult to achieve thorough defrosting of the outdoor unit. Summary of the Invention

[0004] This invention provides a heat pump air conditioning system, a control method for the heat pump air conditioning system, and a control device for the heat pump air conditioning system, in order to overcome the defrost defects in the prior art and achieve the following technical effects: by adding a water turbine capacity ratio coefficient as the basis for determining the switching of the defrost control program, and controlling the indoor water turbine to maintain different working states in different defrost control programs, the outdoor unit can be thoroughly defrosted, and the risk of the heat exchanger inside the indoor water turbine freezing and cracking can be reduced, which is conducive to the stable and efficient operation of the system.

[0005] According to a control method for a heat pump air conditioning system based on a first aspect of the present invention, the heat pump air conditioning system includes multiple indoor units composed of multiple indoor water units and multiple indoor refrigerant units, wherein the multiple indoor water units and multiple indoor refrigerant units are connected in parallel and share a single outdoor unit.

[0006] The control method includes:

[0007] Upon receiving a signal to control the entry into defrost mode, the percentage of the total rated capacity of all indoor water heaters in the total rated capacity of the indoor units is obtained.

[0008] The execution logic is generated based on the water unit's capacity percentage, and the working state of the indoor water unit in defrost mode is controlled and adjusted according to the execution logic.

[0009] According to an embodiment of the present invention, the step of generating execution logic based on the water unit's capacity percentage and controlling and adjusting the operating state of the indoor water unit in defrost mode according to the execution logic specifically includes:

[0010] Based on the proportion of the water unit's capacity, the heat pump air conditioning system is controlled to execute different defrost control programs. Under different defrost control programs, the opening degree of the electronic expansion valve of each indoor water unit is different.

[0011] According to an embodiment of the present invention, the step of controlling the heat pump air conditioning system to execute different defrosting control programs based on the water turbine capacity ratio specifically includes:

[0012] Based on the fact that the water unit capacity ratio is less than the minimum capacity ratio, the electronic expansion valves of all indoor water units in the heat pump air conditioning system are closed, and the heat pump air conditioning system is controlled to enter the defrost mode after all the electronic expansion valves have completed their actions.

[0013] According to an embodiment of the present invention, the step of controlling the heat pump air conditioning system to execute different defrosting control programs based on the water turbine capacity ratio specifically includes:

[0014] The inlet water temperature of each indoor water unit is obtained based on the water unit capacity percentage being greater than or equal to the minimum capacity percentage.

[0015] Based on the inlet water temperature of each indoor water heater, the opening of the electronic expansion valve of each indoor water heater is controlled and adjusted, and after all the electronic expansion valves have completed their operation, the heat pump air conditioning system is controlled to enter the defrost mode.

[0016] According to an embodiment of the present invention, the step of controlling and adjusting the opening degree of the electronic expansion valve of each indoor water heater according to the inlet water temperature of each indoor water heater specifically includes:

[0017] Based on the fact that the inlet water temperature of the indoor water heater is within the first temperature range, the electronic expansion valve of the indoor water heater is controlled to close.

[0018] Based on the fact that the inlet water temperature of the indoor water heater is in the second temperature range, the opening degree of the electronic expansion valve of the indoor water heater is controlled to be the first opening degree.

[0019] Based on the fact that the inlet water temperature of the indoor water heater is in the third temperature range, the opening degree of the electronic expansion valve of the indoor water heater is controlled to be the second opening degree.

[0020] Wherein, the first temperature range is smaller than the second temperature range, the second temperature range is smaller than the third temperature range, and the first opening degree is smaller than the second opening degree.

[0021] According to an embodiment of the present invention, the step of controlling the heat pump air conditioning system to enter the defrost mode after all the electronic expansion valves have completed their operations specifically includes:

[0022] Confirm that the operation of the electronic expansion valve has been completed;

[0023] When the water turbine capacity ratio is in the first ratio range, the heat pump air conditioning system is controlled to enter the defrost mode with the original defrost duration.

[0024] When the water pump capacity ratio is in the second ratio range, the working capacity ratio of the total rated capacity of all currently working indoor units to the total rated capacity of all indoor units is obtained. A new defrosting time is determined based on the working capacity ratio, and the heat pump air conditioning system is controlled to enter the defrosting mode with the new defrosting time.

[0025] Wherein, the first proportion range is smaller than the second proportion range.

[0026] According to an embodiment of the present invention, the step of determining the new defrosting duration based on the percentage of working capacity specifically includes:

[0027] Based on the fact that the percentage of working capacity is less than the first percentage, the new defrosting time is determined to be zero;

[0028] Based on the fact that the percentage of working capacity is greater than the second percentage, it is determined that the new defrosting time will remain unchanged from the original defrosting time.

[0029] If the percentage of working capacity is greater than or equal to the first percentage and less than or equal to the second percentage, then the extension of the new defrosting time compared to the original defrosting time is determined based on the range of the working capacity percentage.

[0030] According to an embodiment of the present invention, the step of determining the extension of the new defrosting time compared to the original defrosting time based on the range of the working capacity percentage specifically includes:

[0031] Based on the fact that the percentage of work capacity is in the third percentage range, the extended duration is determined to be the first duration;

[0032] Based on the fact that the percentage of work capacity is in the fourth percentage range, the extended duration is determined to be the second duration;

[0033] Wherein, the third proportion interval and the fourth proportion interval are both greater than or equal to the first proportion and less than or equal to the second proportion, and the third proportion interval is greater than the fourth proportion interval, and the first duration is less than the second duration.

[0034] According to an embodiment of the present invention, after the step of determining the new defrosting duration based on the percentage of working capacity, the control method of the heat pump air conditioning system further includes:

[0035] Once the new defrosting time is determined to be zero, the compressor is stopped and the heat pump air conditioning system issues an alarm.

[0036] According to a second aspect of the present invention, the control device for a heat pump air conditioning system includes a plurality of indoor units composed of a plurality of indoor water units and a plurality of indoor refrigerant units, wherein the plurality of indoor water units and the plurality of indoor refrigerant units are connected in parallel and share a common outdoor unit.

[0037] The control device includes:

[0038] The acquisition module is used to receive a signal controlling the entry into defrost mode and acquire the proportion of the total rated capacity of all indoor water heaters in the total rated capacity of the indoor units.

[0039] The execution module is used to generate execution logic based on the water unit's capacity percentage, and to control and adjust the working state of the indoor water unit in defrost mode based on the execution logic.

[0040] According to a third aspect of the present invention, a heat pump air conditioning system includes a control device for a heat pump air conditioning system as described in a second aspect of the present invention, and further includes an outdoor unit and a plurality of indoor units;

[0041] The multiple indoor units are composed of several indoor water units and several indoor refrigerant units. The indoor water units and several indoor refrigerant units are connected in parallel and share a single outdoor unit. Each indoor unit is equipped with an electronic expansion valve.

[0042] According to the control method of the heat pump air conditioning system of the present invention, the water turbine capacity ratio coefficient is added as the basis for determining the switching defrost control program, and the indoor water turbine is controlled to maintain different working states in different defrost control programs, thereby ensuring that the capacity of the currently activated indoor unit meets the defrost requirements of the outdoor unit, thereby achieving thorough defrosting of the outdoor unit, and reducing the risk of freezing and cracking of the heat exchanger in the indoor water turbine, which is conducive to the stable and efficient operation of the system. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a flowchart illustrating the control method of the heat pump air conditioning system provided by the present invention;

[0045] Figure 2 This is a schematic diagram of the structure of the control device for the heat pump air conditioning system provided by the present invention;

[0046] Figure 3 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0048] The control method, control device, and heat pump air conditioning system of the present invention are described below with reference to the accompanying drawings. Before detailing the embodiments of the present invention, the overall application scenario is described first. The control method, control device, electronic device, and computer-readable storage medium of the heat pump air conditioning system of the present invention can be applied to the local air conditioning unit, to cloud platforms in the Internet field, or to other types of cloud platforms in the Internet field, or to third-party devices. These third-party devices may include various types such as mobile phones, tablets, laptops, in-vehicle computers, and other smart terminals.

[0049] The following description uses only the control method applicable to heat pump air conditioning systems as an example. It should be understood that the control method of this embodiment can also be applied to cloud platforms and third-party devices.

[0050] It should also be noted that the control method of the present invention is based on the following heat pump air conditioning system. Specifically, the heat pump air conditioning system includes multiple indoor units and one outdoor unit. Each indoor unit is equipped with an electronic expansion valve. The multiple indoor units are composed of several indoor water-cooled units and several indoor refrigerant units, which are connected in parallel and share a single outdoor unit. The indoor refrigerant units are used to regulate the indoor temperature, and the indoor water-cooled units are used to produce hot or cold water.

[0051] like Figure 1 As shown, a control method for a heat pump air conditioning system according to a first aspect embodiment of the present invention includes:

[0052] Step S1: Receive the signal to control the entry into defrost mode, and obtain the proportion of the total rated capacity of all indoor water heaters in the total rated capacity of the indoor units.

[0053] Step S2: Generate execution logic based on the water unit's capacity ratio, and control and adjust the indoor water unit's working status in defrost mode based on the execution logic.

[0054] In related technologies, air conditioner frost increases the thermal resistance of the heat exchanger, which leads to a decrease in the air conditioner's heat exchange capacity. The commonly used defrosting method is reverse cooling defrosting, which means that when the control module detects that the air conditioner meets the defrosting conditions, the four-way valve switches the refrigerant flow direction, switching from heating mode to cooling mode, and the outdoor heat exchanger dissipates heat to perform defrosting.

[0055] In air conditioning systems that combine refrigerant-based and water-based systems, water flows through the water-based system. This water may freeze at low temperatures, potentially causing the water-based system's heat exchanger to crack. Therefore, it's understandable that in defrost mode, if the water-based system participates in the defrost cycle, the risk of the heat exchanger freezing and cracking is higher. However, if the water-based system does not participate in the defrost cycle (i.e., its electronic expansion valve is closed to prevent it from participating in the defrost process), the outdoor unit's evaporation capacity may be insufficient, resulting in incomplete defrosting and making it difficult to achieve thorough defrosting of the outdoor unit.

[0056] To address the technical deficiencies in the aforementioned related technologies, this invention provides a control method that switches between different defrosting control methods based on the water turbine capacity ratio coefficient, thereby adjusting the working state of the indoor water turbine and achieving thorough defrosting of the air conditioner.

[0057] Furthermore, the specific working principle and process of the control method for the heat pump air conditioning system proposed in this invention are as follows: First, after the controller receives the signal to control the heat pump air conditioning system to enter the defrost mode, the system does not immediately enter the defrost mode. Before the system enters the defrost mode, the controller first performs defrost preparation, that is, the controller obtains the water turbine capacity ratio and determines the working state that each indoor water turbine should be in the defrost mode based on the water turbine capacity ratio. Thus, after entering the defrost mode, the controller controls each indoor water turbine according to the above working state.

[0058] It can be understood that the above-mentioned water-cooled unit capacity ratio refers to the ratio of the total rated capacity of all indoor water-cooled units to the total rated capacity of all indoor units. Here, "all indoor water-cooled units" refers to all indoor water-cooled units connected to the outdoor units that need to be defrosted in the heat pump air conditioning system, and "all indoor units" refers to the indoor units connected to the outdoor units that need to be defrosted in the heat pump air conditioning system. Moreover, the above-mentioned "all indoor units" includes both all indoor water-cooled units and all indoor refrigerant units.

[0059] Furthermore, in step S2 above, the working state of the indoor water unit includes an on state or a off state. That is, in step S2, the controller needs to determine the working state of each indoor water unit before and after entering the defrost mode based on the water unit capacity ratio, and enter the defrost mode in this working state. In this way, it can be ensured that the capacity of the currently on indoor unit meets the defrost requirements of the outdoor unit, thereby achieving thorough defrosting of the outdoor unit and reducing the risk of the heat exchanger inside the indoor water unit freezing and cracking.

[0060] It is understandable that the water-cooled unit's capacity ratio reflects the total capacity ratio of the indoor water-cooled unit among all indoor units. When the water-cooled unit's capacity ratio is low, it means that the current indoor refrigerant unit's capacity ratio is high. In this case, by only turning on the indoor refrigerant unit to participate in the defrosting cycle, the air conditioner can be completely defrosted. Therefore, the indoor water-cooled units can be completely shut down, thereby completely avoiding the risk of the heat exchanger inside the indoor water-cooled unit freezing and cracking.

[0061] When the water-cooled unit's capacity is high, it indicates that the current indoor refrigerant unit's capacity is low. In this case, simply turning on the indoor refrigerant unit is generally insufficient to meet the air conditioner's defrosting requirements. Therefore, a small number of indoor water-cooled units can be turned on, meaning that all indoor refrigerant units and a small number of indoor water-cooled units can participate in the defrosting cycle. This will meet the air conditioner's current defrosting requirements, achieve thorough defrosting, and reduce the risk of the heat exchanger inside the indoor water-cooled unit freezing and cracking.

[0062] When the water-cooled unit's capacity is too high, it means that the current indoor refrigerant unit's capacity is very low. At this time, most of the indoor water-cooled units can be turned on, that is, all indoor refrigerant units and most of the indoor water-cooled units can be controlled to participate in the defrosting cycle, thereby meeting the current defrosting needs of the air conditioner and achieving thorough defrosting of the air conditioner.

[0063] In summary, the control method of the heat pump air conditioning system according to the embodiments of the present invention incorporates the water turbine capacity ratio coefficient as the basis for determining the switching defrost control program, and controls the indoor water turbine to maintain different working states in different defrost control programs, thereby ensuring that the capacity of the currently activated indoor unit meets the defrost requirements of the outdoor unit, thus achieving thorough defrosting of the outdoor unit, and reducing the risk of freezing and cracking of the heat exchanger in the indoor water turbine, which is conducive to the stable and efficient operation of the system.

[0064] According to some embodiments of the present invention, the steps of generating execution logic based on the water unit's capacity percentage and controlling and adjusting the indoor water unit's operating state in defrost mode according to the execution logic specifically include:

[0065] Depending on the proportion of water-cooled unit capacity, the heat pump air conditioning system executes different defrosting control programs. Under different defrosting control programs, the opening degree of the electronic expansion valve of each indoor water-cooled unit is different.

[0066] In this embodiment, the controller controls the opening degree of the electronic expansion valve of each indoor water unit to control the working state of each indoor water unit. It can be understood that in different defrosting control programs, each indoor water unit usually has three working states, which include fully open, closed and partially open. The above three working states correspond to the three actions of the electronic expansion valve being fully open, fully closed and partially open, respectively.

[0067] According to some embodiments of the present invention, the step of controlling the heat pump air conditioning system to execute different defrosting control programs based on the proportion of water turbine capacity specifically includes:

[0068] Based on the fact that the water turbine capacity ratio is less than the minimum capacity ratio, the electronic expansion valves of all indoor water turbines in the heat pump air conditioning system are closed, and the heat pump air conditioning system enters the defrost mode after all the electronic expansion valves have completed their actions.

[0069] In this embodiment, when the water unit capacity ratio is less than the minimum capacity ratio, it indicates that the water unit capacity ratio is small. At this time, the system can achieve complete defrosting of the air conditioner by only turning on the indoor refrigerant unit. Therefore, in order to prevent the heat exchanger inside the indoor water unit from freezing and cracking, the controller will control the electronic expansion valves of all indoor water units to close and maintain the above state to enter the defrosting mode.

[0070] For example, the minimum capacity ratio can be 30%, meaning that when the water unit capacity ratio is less than 30%, the electronic expansion valves of all indoor water units will be closed.

[0071] According to another embodiment of the present invention, the step of controlling the heat pump air conditioning system to execute different defrosting control programs based on the water turbine capacity ratio specifically includes:

[0072] The inlet water temperature of each indoor water unit is obtained based on the water unit's capacity percentage being greater than or equal to the minimum capacity percentage.

[0073] Based on the inlet water temperature of each indoor water unit, the opening of the electronic expansion valve of each indoor water unit is controlled and adjusted, and the heat pump air conditioning system is controlled to enter the defrost mode after all the electronic expansion valves have completed their actions.

[0074] In this embodiment, when the water-cooled unit's capacity percentage is greater than or equal to the minimum capacity percentage, it indicates that the water-cooled unit's capacity percentage is relatively large. In this case, if the system only turns on the indoor refrigerant units, the outdoor unit will not be able to defrost completely. Therefore, the system needs to turn on some indoor water-cooled units to participate in the defrosting cycle to meet the defrosting requirements of the outdoor unit. However, since indoor water-cooled units are at risk of freezing and cracking when the inlet water temperature is too low, the controller will obtain the inlet water temperature of each indoor water-cooled unit and judge it one by one. Only indoor water-cooled units whose inlet water temperature meets the set requirements can be turned on and participate in the defrosting cycle, thereby avoiding some indoor water-cooled units from freezing and cracking due to excessively low inlet water temperature.

[0075] In this way, the outdoor unit is thoroughly defrosted, and the risk of the indoor water unit freezing and cracking is minimized, thus ensuring the stable and efficient operation of the system.

[0076] Furthermore, the steps for controlling and adjusting the opening of the electronic expansion valve of each indoor water unit according to the inlet water temperature of each indoor water unit specifically include:

[0077] The electronic expansion valve of the indoor water heater is closed when the inlet water temperature is in the first temperature range.

[0078] Based on the fact that the inlet water temperature of the indoor water unit is in the second temperature range, the opening degree of the electronic expansion valve of the indoor water unit is controlled to the first opening degree.

[0079] Based on the fact that the inlet water temperature of the indoor water unit is in the third temperature range, the opening degree of the electronic expansion valve of the indoor water unit is controlled to the second opening degree.

[0080] Among them, the first temperature range is smaller than the second temperature range, the second temperature range is smaller than the third temperature range, and the first opening degree is smaller than the second opening degree.

[0081] For example, when the inlet water temperature is below 10℃, the heat exchanger of the indoor water heater is very likely to freeze and crack due to the low water temperature, so the electronic expansion valve of the indoor water heater is closed; when the inlet water temperature is greater than or equal to 10℃ and less than or equal to 20℃, the opening degree of the electronic expansion valve of the indoor water heater is controlled to 100 steps; when the inlet water temperature is greater than 20℃, the opening degree of the electronic expansion valve of the indoor water heater is controlled to 150 steps.

[0082] Of course, the above embodiment is only one of the many embodiments of the present invention and does not constitute a specific limitation on the present invention.

[0083] Furthermore, the step of controlling the heat pump air conditioning system to enter defrost mode after all electronic expansion valves have completed their actions specifically includes:

[0084] Confirm that the electronic expansion valve has completed its operation;

[0085] When the water-cooled air conditioning system accounts for the largest proportion of the total capacity, the heat pump air conditioning system is controlled to enter the defrost mode with the original defrost duration.

[0086] When the water chiller capacity ratio is in the second ratio range, obtain the total rated capacity of all currently working indoor units and the working capacity ratio of the total rated capacity of all indoor units, determine the new defrosting time based on the working capacity ratio, and control the heat pump air conditioning system to enter the defrosting mode with the new defrosting time.

[0087] The first percentage range is smaller than the second percentage range.

[0088] In this embodiment, when the water-cooled unit capacity is in the first percentage range, for example, between 30% and 60%, although some indoor water-cooled units shut down due to low inlet water temperature, the remaining indoor water-cooled units and all indoor refrigerant units can meet the defrosting requirements of the air conditioner. Therefore, the original defrosting time can be kept unchanged during the defrosting process.

[0089] When the water chiller capacity ratio is in a relatively high second-rate range, such as between 60% and 100%, the indoor water chiller capacity ratio is too high. Therefore, when some indoor water chillers shut down due to low inlet water temperature, the remaining working indoor units (including the running indoor water chillers and all indoor refrigerant chillers) may not be able to meet the defrosting requirements of the air conditioner. Thus, the controller needs to further determine the size of the working capacity ratio, that is, the ratio of the capacity of the remaining working indoor units to the total capacity of all indoor units, and determine whether to extend the defrosting time based on the size of the working capacity ratio, so as to meet the requirement of thorough defrosting of the air conditioner.

[0090] Furthermore, when the water purifier's capacity percentage is in the second percentage range, the steps for determining the new defrosting duration based on the working capacity percentage specifically include:

[0091] Based on the fact that the percentage of work capacity is less than the percentage of the first, the new defrosting time is determined to be zero.

[0092] Based on the fact that the proportion of work capacity is greater than the second proportion, the new defrosting time is determined to remain unchanged from the original defrosting time.

[0093] If the percentage of work capacity is greater than or equal to the first percentage and less than or equal to the second percentage, then the new defrosting time is determined by the range of the work capacity percentage, which is the extension of the original defrosting time.

[0094] It is understandable that when the percentage of working capacity is less than the first percentage, it means that the total capacity of the currently operable indoor units is too low to meet the defrosting requirements of the outdoor unit, so the system shuts down, meaning the new defrosting time is zero. When the percentage of working capacity is greater than the second percentage, it means that the total capacity of the currently operable indoor units is sufficient to meet the defrosting requirements of the outdoor unit, so the defrosting time can remain unchanged. When the percentage of working capacity is greater than or equal to the first percentage and less than or equal to the second percentage, it proves that the total capacity of the currently operable indoor units is insufficient to meet the defrosting requirements of the outdoor unit, so the defrosting time needs to be extended to compensate for the defrosting process and achieve complete defrosting of the outdoor unit.

[0095] Furthermore, the step of determining the extension of the new defrosting time compared to the original defrosting time based on the range of work capacity percentage includes:

[0096] Based on the fact that the work capacity ratio is in the third ratio range, the extended duration is determined to be the first duration.

[0097] Based on the fact that the work capacity ratio is in the fourth ratio range, the extended duration is determined to be the second duration.

[0098] Among them, the third and fourth percentage intervals are both greater than or equal to the first percentage and less than or equal to the second percentage, and the third percentage interval is greater than the fourth percentage interval, while the first duration is less than the second duration.

[0099] It is understood that in this embodiment, the lower the percentage of work capacity, the shorter the extension time. That is, within the range of the first percentage to the second percentage, the extension time is positively correlated with the percentage of work capacity.

[0100] Furthermore, after determining the new defrosting duration based on the percentage of workload, the control method also includes:

[0101] The new defrost duration is set to zero, the compressor is shut down, and the heat pump air conditioning system issues an alarm.

[0102] For example, when the water unit capacity is between 60% and 100%, each indoor water unit executes its own inlet water temperature detection program. Only indoor water units with an inlet water temperature not lower than 10℃ are turned on and participate in the defrost cycle. The system calculates the ratio of the total capacity of the indoor water units with currently operable PMV (electronic expansion valve), the total capacity of the indoor refrigerant units, and the total capacity of all indoor units (i.e., the working capacity ratio). When the working capacity ratio is between 80% and 100%, the system directly enters defrost mode without extending the defrost time. When the working capacity ratio is between 50% and 80%, the system enters defrost mode and the defrost time is extended by 2 minutes. When the working capacity ratio is between 30% and 50%, the system enters defrost mode and the defrost time is extended by 5 minutes. When the working capacity ratio is between 0% and 30%, the system is not allowed to enter defrost mode, the system alarms, and the compressor stops.

[0103] The control device for the heat pump air conditioning system provided by the present invention is described below. The control device for the heat pump air conditioning system described below can be referred to in correspondence with the control method for the heat pump air conditioning system described above.

[0104] like Figure 2 As shown, according to a second aspect embodiment of the present invention, a control device for a heat pump air conditioning system includes a plurality of indoor units composed of a plurality of indoor water units and a plurality of indoor refrigerant units, wherein the plurality of indoor water units and the plurality of indoor refrigerant units are connected in parallel and share a common outdoor unit. The control device includes:

[0105] The acquisition module 110 is used to receive the signal controlling the entry into the defrost mode and acquire the proportion of the total rated capacity of all indoor water heaters in the total rated capacity of the indoor units.

[0106] The execution module 120 is used to generate execution logic based on the water unit's capacity ratio, and to control and adjust the working status of the indoor water unit in defrost mode based on the execution logic.

[0107] According to a third aspect of the present invention, a heat pump air conditioning system includes a control device for the heat pump air conditioning system, and further includes an outdoor unit and a plurality of indoor units.

[0108] The indoor units consist of several indoor water units and several indoor refrigerant units. The indoor water units and the indoor refrigerant units are connected in parallel and share a single outdoor unit. Each indoor unit is equipped with an electronic expansion valve.

[0109] According to the heat pump air conditioning system and its control device of the present invention, the water turbine capacity ratio coefficient is used as the basis for determining the switching defrosting control method: combined with the water temperature monitoring results, the opening of the electronic expansion valve and the defrosting time are adjusted to achieve the purpose of defrosting all frost, which is conducive to the stable and efficient operation of the system.

[0110] Figure 3 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 3 As shown, the electronic device may include a processor 810, a communication interface 820, a memory 830, and a communication bus 840. The processor 810, communication interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logic instructions in the memory 830 to execute a control method for the heat pump air conditioning system. This method includes: receiving a signal to enter defrost mode; obtaining the proportion of the total rated capacity of all indoor water-cooled units to the total rated capacity of the indoor units; generating execution logic based on the proportion of water-cooled unit capacity; and controlling and adjusting the operating state of the indoor water-cooled units in defrost mode according to the execution logic.

[0111] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0112] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute a control method for a heat pump air conditioning system. The method includes: receiving a signal to control the entry into a defrost mode; obtaining the proportion of the total rated capacity of all indoor water units to the total rated capacity of the indoor units; generating execution logic based on the proportion of water unit capacity; and controlling and adjusting the working state of the indoor water units in the defrost mode based on the execution logic.

[0113] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements a control method for a heat pump air conditioning system. The method includes: receiving a signal to control the entry into a defrost mode; obtaining the proportion of the total rated capacity of all indoor water-cooled units to the total rated capacity of the indoor units; generating execution logic based on the proportion of water-cooled unit capacity; and controlling and adjusting the working state of the indoor water-cooled units in the defrost mode according to the execution logic.

[0114] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0115] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a heat pump air conditioning system, characterized in that, The heat pump air conditioning system includes multiple indoor units consisting of several indoor water units and several indoor refrigerant units, all of which are connected in parallel and share a single outdoor unit. The control method includes: Upon receiving a signal to control the entry into defrost mode, the percentage of the total rated capacity of all indoor water heaters in the total rated capacity of the indoor units is obtained. Execution logic is generated based on the water unit's capacity percentage, and the working state of the indoor water unit in defrost mode is controlled and adjusted based on the execution logic. The step of generating execution logic based on the water unit's capacity percentage and controlling and adjusting the indoor water unit's operating state in defrost mode according to the execution logic specifically includes: Based on the proportion of the water unit's capacity, the heat pump air conditioning system is controlled to execute different defrost control programs. Under different defrost control programs, the opening degree of the electronic expansion valve of each indoor water unit is different.

2. The control method for a heat pump air conditioning system according to claim 1, characterized in that, The step of controlling the heat pump air conditioning system to execute different defrosting control programs according to the water turbine capacity ratio specifically includes: Based on the fact that the water unit capacity ratio is less than the minimum capacity ratio, the electronic expansion valves of all indoor water units in the heat pump air conditioning system are closed, and the heat pump air conditioning system is controlled to enter the defrost mode after all the electronic expansion valves have completed their actions.

3. The control method for a heat pump air conditioning system according to claim 1, characterized in that, The step of controlling the heat pump air conditioning system to execute different defrosting control programs according to the water turbine capacity ratio specifically includes: The inlet water temperature of each indoor water unit is obtained based on the water unit capacity percentage being greater than or equal to the minimum capacity percentage. Based on the inlet water temperature of each indoor water heater, the opening of the electronic expansion valve of each indoor water heater is controlled and adjusted, and after all the electronic expansion valves have completed their operation, the heat pump air conditioning system is controlled to enter the defrost mode.

4. The control method for a heat pump air conditioning system according to claim 3, characterized in that, The step of controlling and adjusting the opening degree of the electronic expansion valve of each indoor water heater according to the inlet water temperature of each indoor water heater specifically includes: Based on the fact that the inlet water temperature of the indoor water heater is within the first temperature range, the electronic expansion valve of the indoor water heater is controlled to close. Based on the fact that the inlet water temperature of the indoor water heater is in the second temperature range, the opening degree of the electronic expansion valve of the indoor water heater is controlled to be the first opening degree. Based on the fact that the inlet water temperature of the indoor water heater is in the third temperature range, the opening degree of the electronic expansion valve of the indoor water heater is controlled to be the second opening degree. Wherein, the first temperature range is smaller than the second temperature range, the second temperature range is smaller than the third temperature range, and the first opening degree is smaller than the second opening degree.

5. The control method for a heat pump air conditioning system according to claim 3 or 4, characterized in that, The step of controlling the heat pump air conditioning system to enter the defrost mode after all the electronic expansion valves have completed their actions specifically includes: Confirm that the operation of the electronic expansion valve has been completed; When the water turbine capacity ratio is in the first ratio range, the heat pump air conditioning system is controlled to enter the defrost mode with the original defrost duration. When the water pump capacity ratio is in the second ratio range, the working capacity ratio of the total rated capacity of all currently working indoor units to the total rated capacity of all indoor units is obtained. A new defrosting time is determined based on the working capacity ratio, and the heat pump air conditioning system is controlled to enter the defrosting mode with the new defrosting time. Wherein, the first proportion range is smaller than the second proportion range.

6. The control method for a heat pump air conditioning system according to claim 5, characterized in that, The step of determining the new defrosting time based on the percentage of working capacity specifically includes: Based on the fact that the percentage of working capacity is less than the first percentage, the new defrosting time is determined to be zero; Based on the fact that the percentage of the working capacity is greater than the second percentage, it is determined that the new defrosting time will remain unchanged from the original defrosting time. If the percentage of working capacity is greater than or equal to the first percentage and less than or equal to the second percentage, then the extension of the new defrosting time compared to the original defrosting time is determined based on the range of the working capacity percentage.

7. The control method for a heat pump air conditioning system according to claim 6, characterized in that, The step of determining the extension of the new defrosting time compared to the original defrosting time based on the range of the work capacity percentage specifically includes: Based on the fact that the percentage of work capacity is in the third percentage range, the extended duration is determined to be the first duration; Based on the fact that the percentage of work capacity falls within the fourth percentage range, the extended duration is determined to be the second duration. Wherein, the third proportion interval and the fourth proportion interval are both greater than or equal to the first proportion and less than or equal to the second proportion, and the third proportion interval is greater than the fourth proportion interval, and the first duration is less than the second duration.

8. The control method for a heat pump air conditioning system according to claim 6, characterized in that, After the step of determining the new defrosting time based on the percentage of working capacity, the method further includes: Once the new defrosting time is determined to be zero, the compressor is stopped and the heat pump air conditioning system issues an alarm.

9. A control device for a heat pump air conditioning system, characterized in that, The heat pump air conditioning system includes multiple indoor units consisting of several indoor water units and several indoor refrigerant units, all of which are connected in parallel and share a single outdoor unit. The control device includes: The acquisition module is used to receive a signal controlling the entry into defrost mode and acquire the proportion of the total rated capacity of all indoor water heaters in the total rated capacity of the indoor units. An execution module is used to generate execution logic based on the water unit's capacity percentage, and to control and adjust the working state of the indoor water unit in defrost mode based on the execution logic. The step of generating execution logic based on the water unit's capacity percentage and controlling and adjusting the indoor water unit's operating state in defrost mode according to the execution logic specifically includes: Based on the proportion of the water unit's capacity, the heat pump air conditioning system is controlled to execute different defrost control programs. Under different defrost control programs, the opening degree of the electronic expansion valve of each indoor water unit is different.

10. A heat pump air conditioning system, characterized in that, The system includes the control device for the heat pump air conditioning system as described in claim 9, and further includes an outdoor unit and multiple indoor units; The multiple indoor units are composed of several indoor water units and several indoor refrigerant units. The indoor water units and several indoor refrigerant units are connected in parallel and share a single outdoor unit. Each indoor unit is equipped with an electronic expansion valve.

Images