Anti-freezing control method, device and system of heat pump system and storage medium

Abstract

This application relates to the field of heat pumps and discloses a method, device, system, and storage medium for antifreeze control of a heat pump system. The method acquires the temperature parameters of the unit in the heat pump system when it is shut down due to an antifreeze fault; identifies whether the real-time temperature parameters meet preset load state adjustment conditions; if they do, the load state of the heat pump system is adjusted according to the real-time temperature parameters; if not, the unit remains shut down in the antifreeze fault state and continues to operate. This application reduces the risk of water freezing in the heat pump system and lowers the failure rate upon restart by adjusting the load action of the heat pump system in real time according to the temperature parameters after shutdown, thereby changing the refrigerant pressure and flow direction.

Description

Technical Field

[0001] This application relates to the field of heat pumps, and more particularly to a method, apparatus, system, and storage medium for antifreeze control of a heat pump system. Background Technology

[0002] Traditional air source heat pump operation control schemes primarily control unit shutdown during cooling or defrosting mode by detecting and reporting antifreeze faults. However, reported antifreeze faults may be due to improper engineering applications or component defects leading to excessively low water circuit temperatures. In such cases, after unit shutdown, there is often no intervention on various unit parameters or load status; that is, refrigerant can still migrate, affecting the water and refrigerant circuits, leading to difficulties in restarting, the risk of water circuit freezing, and other risks. Summary of the Invention

[0003] This application provides a method, apparatus, system, and storage medium for antifreeze control of a heat pump system, in order to solve the problem of high failure rate of existing heat pumps when restarting the unit under antifreeze failure conditions.

[0004] The first aspect of this application provides a method for antifreeze control of a heat pump system, comprising: acquiring temperature parameters of the unit in the heat pump system, wherein the temperature parameters are real-time temperature parameters of the refrigerant after the heat pump system enters an antifreeze fault state and shuts down; identifying whether the real-time temperature parameters meet preset load state adjustment conditions; if they meet the conditions, adjusting the load state of the heat pump system according to the real-time temperature parameters; if they do not meet the conditions, maintaining the unit in an antifreeze fault state shutdown and continuing to operate.

[0005] Optionally, obtaining the temperature parameters of the unit in the heat pump system includes: determining whether the heat pump system has entered an antifreeze fault state and stopped for a preset time interval; if so, using sensors to collect the inlet water temperature and outlet water temperature of the unit in the heat pump system, the inlet temperature and outlet temperature of the evaporator refrigerant circuit, and the saturated evaporation temperature of the unit, wherein the saturated evaporation temperature is obtained based on the low-pressure conversion of the unit.

[0006] Optionally, identifying whether the real-time temperature parameters meet the preset load state adjustment conditions includes: comparing the unit's inlet water temperature, outlet water temperature, evaporator refrigerant circuit inlet temperature, outlet temperature, and unit's saturated evaporation temperature with the temperature thresholds corresponding to the fault state; if all are greater than the temperature thresholds corresponding to the fault state, then a maintenance control signal is output; if at least one is not greater than the temperature thresholds corresponding to the fault state, then a load adjustment signal is output.

[0007] Optionally, adjusting the load state of the heat pump system based on the real-time temperature parameters includes: determining the target opening degree of the electronic expansion valve in the heat pump system based on the real-time temperature parameters; determining the corresponding control signal from a preset valve opening control table based on the target opening degree; and controlling the electronic expansion valve to operate based on the control signal to achieve load state adjustment.

[0008] Optionally, after controlling the electronic expansion valve to adjust the load state based on the control signal, the method further includes: determining whether to adjust the refrigerant flow direction based on the real-time temperature parameter; if so, outputting a switching command to switch the flow direction of the four-way valve in the heat pump system.

[0009] Optionally, before acquiring the temperature parameters of the unit in the heat pump system, the method further includes: acquiring the operating mode and initial operating temperature of the unit in the heat pump system, wherein the initial operating temperature includes the initial inlet water temperature and initial outlet water temperature of the unit, the initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit; determining whether the operating mode is a cooling mode or a heating defrosting mode; if it is a cooling mode or a heating defrosting mode, comparing the initial inlet water temperature, initial outlet water temperature, initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit with the corresponding temperature threshold under non-fault conditions; if at least one of them is less than or equal to the corresponding temperature threshold under non-fault conditions, controlling the unit to enter an anti-freeze fault state and shut down.

[0010] Optionally, after adjusting the load status of the heat pump system according to the real-time temperature parameters, the method further includes: starting a continuous monitoring program to monitor the changes in the unit's temperature parameters; making a secondary adjustment to the adjusted load status based on the changes in the temperature parameters, until a start command or a shutdown command to continue maintaining the anti-freeze fault status is received, after which the monitoring state is exited.

[0011] A second aspect of this application provides an antifreeze control setting for a heat pump system, comprising: an acquisition module for acquiring temperature parameters of the unit in the heat pump system, wherein the temperature parameters are real-time temperature parameters after the heat pump system enters an antifreeze fault state and shuts down; an identification module for identifying whether the real-time temperature parameters meet preset load state adjustment conditions; and an adjustment module for adjusting the load state of the heat pump system according to the real-time temperature parameters if the conditions are met, and maintaining the unit in the antifreeze fault state shutdown and continuing operation if the conditions are not met.

[0012] A third aspect of this application provides a heat pump system, comprising: the heat pump system including at least one electrical control cabinet, a memory and at least one processor, the memory storing instructions; the at least one processor calling the instructions in the memory to cause the heat pump system to execute the above-described heat pump system antifreeze control method.

[0013] A fourth aspect of this application provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the aforementioned antifreeze control method for a human body jumping system.

[0014] The technical solution provided in this application acquires the temperature parameters of the unit in the heat pump system when it is shut down due to a freeze-proof fault; identifies whether the real-time temperature parameters meet the preset load state adjustment conditions; if they do, the load state of the heat pump system is adjusted according to the real-time temperature parameters; if not, the unit remains shut down in the freeze-proof fault state and continues to operate. This application adjusts the load action of the heat pump system in real time according to the temperature parameters after shutdown to change the refrigerant pressure and flow state of the system, thereby reducing the risk of water freezing in the heat pump system and lowering the failure rate upon restart. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first embodiment of the antifreeze control method for the heat pump system in this application;

[0016] Figure 2 This is a schematic diagram of the second embodiment of the antifreeze control method for the heat pump system in this application;

[0017] Figure 3 This is a schematic diagram of an embodiment of the antifreeze control device for the heat pump system in this application;

[0018] Figure 4 This is a schematic diagram of another embodiment of the antifreeze control device for the heat pump system in this application;

[0019] Figure 5 This is a schematic diagram of one embodiment of the heat pump system in this application. Detailed Implementation

[0020] This application provides a method, device, system, and storage medium for antifreeze control of a heat pump system. It enables water circuit antifreeze control of the heat pump system in cooling or heating defrosting modes. Compared to traditional antifreeze control, it also enhances post-shutdown status monitoring and control, significantly improving system stability and reliability. In practical applications, parameters such as thresholds and waiting times can be further optimized and adjusted according to the specific performance of the heat pump unit and the operating environment to achieve the best control effect.

[0021] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms “comprising” or “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] For ease of understanding, the specific process of this application is described below. Please refer to [link / reference]. Figure 1 One embodiment of the antifreeze control method for a heat pump system in this application includes:

[0023] 101. Obtain the temperature parameters of the unit in the heat pump system. These temperature parameters are the real-time temperature parameters of the refrigerant after the heat pump system enters the anti-freeze fault state and shuts down.

[0024] It is understood that the executing entity of this application can be a heat pump system, a control device independent of the heat pump system, or even an antifreeze control program installed in the heat pump system; the specifics are not limited here. This embodiment uses a control device that can run in the heat pump system as an example for illustration.

[0025] The heat pump system in this embodiment adopts the existing system structure, mainly including the unit's inlet and outlet water system, evaporator refrigerant circuit, heat pump, and various sensors. The entire antifreeze control process can be triggered by control commands. For example, after the heat pump system is started and initialized, the user can trigger the antifreeze control operation command through the heat pump system's control interface. Then, the controller in the heat pump system controls the unit to operate under the constraints triggered by the antifreeze control.

[0026] It should be noted that this step mainly involves controlling various sensors installed on the refrigerant system in the heat pump system to collect different temperatures, specifically the unit's inlet water temperature, outlet water temperature, evaporator refrigerant circuit inlet temperature, outlet temperature, and the unit's low-pressure data. Among these, the unit's low-pressure data also needs to be converted into saturated evaporation temperature based on the relationship between pressure and temperature.

[0027] Furthermore, the real-time temperature parameter here can be the temperature value at a specific moment or the average temperature over a period of time. Preferably, the average temperature value over a period of time is selected. That is, temperature data is read from the memory of each sensor according to the same time period, and then the average value of the temperature data within that time period is calculated using methods such as normalization and mean calculation, which is used as the real-time temperature parameter. At the same time, this real-time temperature parameter should be understood as a set of temperature values.

[0028] 102. Identify whether the real-time temperature parameters meet the preset load condition adjustment conditions.

[0029] In this embodiment, the load state adjustment condition is based on the temperature threshold set by the test results. Specifically, it consists of multiple temperature thresholds, including the unit's inlet water temperature threshold, outlet water temperature threshold, evaporator refrigerant circuit inlet temperature threshold, outlet temperature threshold, and unit's saturated evaporation temperature threshold, etc.

[0030] After collecting various real-time temperature parameters, each real-time temperature parameter is compared with its corresponding temperature threshold, and the result of the comparison is used to determine whether the threshold is met.

[0031] In another feasible implementation, the corresponding control signal output is determined based on the comparison result. If it is less than the temperature threshold, an entry load adjustment signal will be generated to control the heat pump system to enter the load state adjustment process; otherwise, a maintenance control signal will be generated to control the heat pump system to continue to operate according to the current mode or state.

[0032] 103. If satisfied, adjust the load status of the heat pump system according to the real-time temperature parameters.

[0033] 104. If not satisfied, the unit shall remain in antifreeze fault state and be shut down while continuing to operate.

[0034] In this embodiment, "satisfied" and "not satisfied" refer to whether the real-time temperature parameter is greater than the corresponding temperature threshold. If it is, then it is satisfied; if not, then it is not satisfied.

[0035] It should be noted that this load state should be understood as the opening degree of the electronic expansion valve. When it is determined that each real-time temperature parameter is not greater than its corresponding temperature threshold, the temperature level of each real-time temperature parameter can be determined. Based on the temperature level, the corresponding control method can be selected from the preset control strategy of the electronic expansion valve, and a corresponding control signal can be generated to control the opening degree of the electronic expansion valve to adjust to the corresponding opening degree.

[0036] Furthermore, after determining the temperature levels of each real-time temperature parameter, the average value of each temperature level is calculated, and subsequent opening control is performed based on the average value.

[0037] When determining whether the load is greater than the corresponding temperature threshold, the load status adjustment can be determined based on the existence of a percentage that is not greater than a certain threshold. This percentage can correspond to one or more values ​​that are not greater than a certain threshold.

[0038] In this embodiment, the temperature parameters of the unit in the heat pump system are acquired when it is shut down due to a freeze-proof fault. It is then determined whether the real-time temperature parameters meet preset load adjustment conditions. If they do, the load state of the heat pump system is adjusted according to the real-time temperature parameters. If not, the unit remains shut down under the freeze-proof fault condition and continues to operate. This application adjusts the load action of the heat pump system in real time by comparing the real-time temperature parameters after shutdown with preset thresholds, thereby changing the refrigerant pressure and flow direction, reducing the risk of water freezing in the heat pump system, and lowering the failure rate upon restart.

[0039] like Figure 2 The second embodiment of the antifreeze control method for the heat pump system in this application includes:

[0040] 201. Obtain the real-time temperature parameters of the refrigerant after the unit in the heat pump system enters the anti-freeze fault state and shuts down.

[0041] Specifically, the system determines whether the heat pump system has entered an anti-freeze fault state and shut down for a preset time interval. This preset time interval should be understood as the length of time that the unit in the heat pump system is allowed to continue operating after an anti-freeze fault is confirmed. This time interval is set by the user based on experience or can be determined through testing. If the time interval is reached, the system uses sensors to collect the inlet water temperature and outlet water temperature of the unit, the inlet temperature and outlet temperature of the evaporator refrigerant circuit, and the saturated evaporation temperature of the unit. The saturated evaporation temperature is obtained based on the low-pressure conversion of the unit.

[0042] Understandably, after the heat pump system is started and initialized, it triggers the initialization and calibration of each sensor (inlet water temperature sensor, outlet water temperature sensor, evaporator refrigerant inlet temperature sensor, evaporator refrigerant outlet temperature sensor, and low-pressure sensor) to ensure the accuracy of the collected data.

[0043] Then, the data transmitted from each sensor is collected in real time and analyzed to monitor the unit's operating status in real time, obtain the target working mode, compressor on / off status, and initial temperature and pressure data, but no judgment or control operation is performed at this time.

[0044] Furthermore, for some of the aforementioned temperatures that cannot be directly read, this method also includes a data conversion process. Specifically, pressure data at the corresponding monitoring location is collected by a pressure sensor, and then the temperature is converted using the relationship between pressure and temperature changes. The lower the pressure, the lower the temperature. Based on this relationship, a pressure-temperature relationship curve is output, and the pressure can be directly converted into temperature by querying the curve.

[0045] In practical applications, after the unit enters the anti-freeze fault shutdown state, the timing function is activated, and it waits for a certain period of time (for example, set to T minutes, where T is determined according to system characteristics and actual needs). After T minutes, the unit's inlet water temperature, outlet water temperature, evaporator refrigerant circuit inlet temperature, evaporator refrigerant circuit outlet temperature, and unit low-pressure (saturated evaporation temperature) data are collected again.

[0046] 202. Compare the unit's inlet and outlet water temperatures, the inlet and outlet temperatures of the evaporator's refrigerant circuit, and the unit's saturated evaporation temperature with the corresponding temperature thresholds under fault conditions.

[0047] The temperature threshold corresponding to this fault state is actually based on the temperature at which the refrigerant will not freeze during shutdown. This non-freezing temperature can be determined through experimental test data or by combining it with the ambient temperature. The temperatures collected after time T are compared with the temperature thresholds set after the fault shutdown. Based on the comparison results, if all temperatures are greater than the corresponding temperature thresholds, the shutdown state is maintained; if any temperature is less than the corresponding temperature threshold, the load adjustment phase begins.

[0048] 203. If all values ​​are greater than the corresponding temperature threshold under fault conditions, then output a sustain control signal.

[0049] 204. If there is at least one temperature threshold that is not greater than the temperature threshold corresponding to the fault condition, then output a load adjustment signal.

[0050] If, after a certain period of shutdown due to a freeze protection failure, the unit's inlet water temperature, outlet water temperature, evaporator refrigerant inlet temperature, evaporator refrigerant outlet temperature, and low-pressure unit (converted to saturated evaporation temperature) are all greater than the corresponding temperature thresholds, the unit will remain in its current shutdown state.

[0051] If, after a certain period of shutdown due to a freeze protection failure, the unit's inlet water temperature, outlet water temperature, evaporator refrigerant inlet temperature, evaporator refrigerant outlet temperature, and low-pressure unit pressure (converted to saturated evaporation temperature) are all below the corresponding temperature thresholds, then step 205 shall be executed.

[0052] 205. Adjust the load status of the heat pump system based on real-time temperature parameters.

[0053] When it is determined that load adjustment is required, the control system outputs a valve opening control signal of 480 steps to the electronic expansion valve port of the unit according to the settings, and at the same time switches the direction of the four-way valve.

[0054] In this embodiment, the 480-step control is a pre-set control strategy, which can be set to one control opening degree or multiple control opening degrees. For multiple opening degrees, the target opening degree of the electronic expansion valve in the heat pump system is determined based on the real-time temperature parameters; based on the target opening degree, a corresponding control signal is determined from a preset valve opening control table, and the electronic expansion valve is controlled to operate based on the control signal to adjust the load state.

[0055] Similarly, regarding the switching direction, the decision to adjust the refrigerant flow direction is based on the real-time temperature parameters; if so, a switching command is output to switch the flow direction of the four-way valve in the heat pump system.

[0056] 206. If satisfied, adjust the load status of the heat pump system according to the real-time temperature parameters.

[0057] 207. If not satisfied, the unit shall remain in antifreeze fault state and be shut down while continuing to operate.

[0058] When it is determined that each real-time temperature parameter is not greater than the corresponding temperature threshold, the temperature level of each real-time temperature parameter can be determined, and the corresponding control method can be selected from the preset control strategy of the electronic expansion valve based on the temperature level, and the corresponding control signal can be generated to control the opening degree of the electronic expansion valve to be adjusted to the corresponding opening degree.

[0059] In another feasible embodiment, before obtaining the temperature parameters of the unit in the heat pump system, the method further includes:

[0060] The operating mode and initial operating temperature of the unit in the heat pump system are collected. The initial operating temperature includes the initial inlet water temperature and initial outlet water temperature of the unit, the initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit.

[0061] Determine whether the operating mode is a cooling mode or a heating / defrosting mode;

[0062] If it is in cooling mode or heating defrosting mode, the initial inlet water temperature, initial outlet water temperature, initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit are compared with the corresponding temperature threshold under non-fault conditions.

[0063] If at least one temperature threshold less than or equal to the temperature threshold corresponding to the non-fault condition exists, the unit is controlled to enter an anti-freeze fault state and shut down.

[0064] In other words, the need to determine whether to enter temperature and pressure parameter judgment is based on the unit's operating mode. For example, if the operating mode is cooling mode or heating defrost mode, the unit needs to perform steps 201-207 above; if the operating mode is not cooling mode or heating defrost mode, the unit does not need to perform steps 201-207 above. If the unit's inlet water temperature, outlet water temperature, evaporator refrigerant inlet temperature, evaporator refrigerant outlet temperature, and low-pressure (converted to saturated evaporation temperature) are greater than the corresponding reference values, the unit will operate according to the current mode.

[0065] If the unit inlet water temperature, unit outlet water temperature, unit evaporator refrigerant inlet temperature, unit evaporator refrigerant outlet temperature, and unit low pressure (converted to saturated evaporation temperature) are less than or equal to the corresponding reference values, the unit will immediately stop the current mode and enter the anti-freeze fault state to shut down.

[0066] Furthermore, before determining whether the unit has an anti-freeze malfunction, the following also applies:

[0067] Set the first temperature threshold (the temperature threshold corresponding to non-fault conditions) for the unit inlet water temperature, unit outlet water temperature, unit evaporator refrigerant circuit inlet temperature, unit evaporator refrigerant circuit outlet temperature, and unit low pressure (converted to saturated evaporation temperature) before shutdown.

[0068] Set a second temperature threshold (the temperature threshold corresponding to the fault) for the unit inlet water temperature, unit outlet water temperature, unit evaporator refrigerant inlet temperature, unit evaporator refrigerant outlet temperature, and unit low pressure (converted to saturated evaporation temperature) after a fault shutdown.

[0069] These reference values ​​are used to determine whether the system's pressure and temperature parameters deviate from the normal range, so as to determine whether it is necessary to report an antifreeze fault and shut down the machine.

[0070] Furthermore, after adjusting the load state of the heat pump system based on the real-time temperature parameters, the method further includes:

[0071] Start the continuous monitoring program to monitor the changes in the temperature parameters of the unit;

[0072] The load status is adjusted a second time based on the changes in the temperature parameters until a start command or a shutdown command to continue the anti-freeze fault status is received, at which point the monitoring state is exited.

[0073] After the load adjustment is completed, continuously monitor the changes in various parameters of the unit to ensure that the refrigerant pressure and flow status of the system are stable within a safe range, effectively prevent the risk of water freezing, and wait for the next start command or continue to remain in the shutdown state (depending on the actual situation).

[0074] By implementing the method provided in this embodiment, the load action of the heat pump system can be adjusted in real time according to parameters such as refrigerant temperature and pressure after shutdown, so as to change the refrigerant pressure and flow direction of the system, reduce the risk of water circuit freezing of the water-side heat exchanger after shutdown and reduce the failure rate of restart, thereby improving the operational reliability of the heat pump unit.

[0075] The above describes the antifreeze control method for the heat pump system in this application. The following describes the antifreeze control device for the heat pump system in this application. Please refer to [link / reference]. Figure 3 One embodiment of the antifreeze control device for a heat pump system in this application includes:

[0076] The acquisition module 310 is used to acquire the temperature parameters of the unit in the heat pump system, wherein the temperature parameters are the real-time temperature parameters of the heat pump system after it enters the anti-freeze fault state and stops.

[0077] The judgment module 320 is used to identify whether the real-time temperature parameter meets the preset load state adjustment conditions;

[0078] The adjustment module 330 is used to adjust the load status of the heat pump system according to the real-time temperature parameters if the conditions are met; otherwise, the unit is kept in the anti-freeze fault state and shut down while continuing to operate.

[0079] In this embodiment, the load action of the heat pump system is adjusted in real time according to the temperature parameters after shutdown, so as to change the refrigerant pressure and flow state of the system, reduce the risk of water freezing in the heat pump system and reduce the failure rate of restart.

[0080] Please see Figure 4 Another embodiment of the antifreeze control device for the heat pump system in this application includes:

[0081] The acquisition module 310 is used to acquire the temperature parameters of the unit in the heat pump system, wherein the temperature parameters are the real-time temperature parameters of the heat pump system after it enters the anti-freeze fault state and stops.

[0082] The judgment module 320 is used to determine whether the real-time temperature parameter is greater than the temperature threshold under fault conditions;

[0083] The adjustment module 330 is used to adjust the load status of the heat pump system according to the real-time temperature parameters if the conditions are met; otherwise, the unit is kept in the anti-freeze fault state and shut down while continuing to operate.

[0084] Optionally, the acquisition module 310 includes:

[0085] The timing unit 311 is used to determine whether the heat pump system has entered the antifreeze fault state and stopped for a preset time interval.

[0086] The acquisition unit 312 is used to acquire the inlet water temperature and outlet water temperature of the unit in the heat pump system, the inlet temperature and outlet temperature of the evaporator refrigerant circuit, and the saturated evaporation temperature of the unit when a preset time interval is reached, using a sensor. The saturated evaporation temperature is obtained based on the low-pressure conversion of the unit.

[0087] Optionally, the identification module 320 is specifically used for:

[0088] The unit's inlet water temperature, outlet water temperature, evaporator refrigerant circuit inlet temperature, outlet temperature, and saturated evaporation temperature are compared with the corresponding temperature thresholds under fault conditions.

[0089] If all values ​​are greater than the temperature threshold corresponding to the fault condition, then a sustain control signal is output.

[0090] If at least one temperature threshold not greater than the temperature threshold corresponding to the fault condition exists, a load adjustment signal is output.

[0091] Optionally, the adjustment module 330 includes:

[0092] Determining unit 331 is used to determine the target opening degree of the electronic expansion valve in the heat pump system based on the real-time temperature parameters;

[0093] The adjustment unit 332 is used to determine the corresponding control signal from a preset valve opening control table based on the target opening degree, and control the electronic expansion valve to operate based on the control signal to achieve the adjustment of the load state.

[0094] Optionally, the determining unit 331 is further configured to: determine whether to adjust the refrigerant flow direction based on the real-time temperature parameters;

[0095] The adjustment unit 332 is also used to output a switching command to switch the flow direction of the four-way valve in the heat pump system when the direction of refrigerant flow is determined.

[0096] Optionally, the device further includes a fault diagnosis module 340, used for:

[0097] The operating mode and initial operating temperature of the unit in the heat pump system are collected. The initial operating temperature includes the initial inlet water temperature and initial outlet water temperature of the unit, the initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit.

[0098] Determine whether the operating mode is a cooling mode or a heating / defrosting mode;

[0099] If it is in cooling mode or heating defrosting mode, the initial inlet water temperature, initial outlet water temperature, initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit are compared with the corresponding temperature threshold under non-fault conditions.

[0100] If at least one temperature threshold less than or equal to the temperature threshold corresponding to the non-fault condition exists, the unit is controlled to enter an anti-freeze fault state and shut down.

[0101] Optionally, the device further includes a detection module 350, used for:

[0102] Start the continuous monitoring program to monitor the changes in the temperature parameters of the unit;

[0103] The load status is adjusted a second time based on the changes in the temperature parameters until a start command or a shutdown command to continue the anti-freeze fault status is received, at which point the monitoring state is exited.

[0104] In this embodiment, the temperature parameters of the unit in the heat pump system are acquired when it is shut down due to a freeze-proof fault. It is then determined whether the real-time temperature parameters meet preset load adjustment conditions. If they do, the load state of the heat pump system is adjusted according to the real-time temperature parameters. If not, the unit remains shut down under the freeze-proof fault condition and continues to operate. This application adjusts the load action of the heat pump system in real time based on the temperature parameters after shutdown to change the refrigerant pressure and flow direction, thereby reducing the risk of water freezing in the heat pump system and lowering the failure rate upon restart.

[0105] above Figure 3 and Figure 4 The antifreeze control device of the heat pump system in this application is described in detail from the perspective of modular functional entities. The heat pump system in this application is described in detail from the perspective of hardware processing.

[0106] See Figure 5 As shown, the heat pump system includes a processor 500 and a memory 501. The memory 501 stores machine-executable instructions that can be executed by the processor 500. The processor 500 executes the machine-executable instructions to implement the antifreeze control method of the heat pump system described above.

[0107] Furthermore, Figure 5 The heat pump system shown also includes a bus 502 and a communication interface 503. The processor 500, the communication interface 503 and the memory 501 are connected via the bus 502.

[0108] The memory 501 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 503 (which can be wired or wireless), such as the Internet, wide area network, local area network, or metropolitan area network. The bus 502 may be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0109] The processor 500 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of the processor 500 or by instructions in software form. The processor 500 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this disclosure. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this disclosure can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 501. The processor 500 reads the information in memory 501 and, in conjunction with its hardware, completes the method steps of the aforementioned embodiment.

[0110] This application also provides a computer-readable storage medium, which can be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium. The computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the steps of the antifreeze control method for a heat pump system.

[0111] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0112] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or 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 described in the various embodiments of this application. 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.

[0113] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application.

Claims

1. A freeze prevention control method for a heat pump system, characterized by, include: The temperature parameters of the unit in the heat pump system are obtained, wherein the temperature parameters are the real-time temperature parameters of the refrigerant after the heat pump system enters the anti-freeze fault state and stops. Identify whether the real-time temperature parameter meets the preset load state adjustment conditions; If the conditions are met, the load status of the heat pump system is adjusted according to the real-time temperature parameters. If the conditions are not met, the unit will remain shut down under anti-freezing fault conditions and continue to operate.

2. The freeze prevention control method of a heat pump system according to claim 1, characterized by, The process of obtaining the temperature parameters of the unit in the heat pump system includes: Determine whether the preset time interval has elapsed since the heat pump system entered an antifreeze fault state and shut down. If the temperature reaches the target value, the inlet and outlet water temperatures of the unit in the heat pump system, the inlet and outlet temperatures of the evaporator refrigerant circuit, and the saturated evaporation temperature of the unit are collected using sensors. The saturated evaporation temperature is obtained based on the low-pressure conversion of the unit.

3. The freeze prevention control method for a heat pump system according to claim 2, characterized by, The step of identifying whether the real-time temperature parameter meets the preset load state adjustment conditions includes: The unit's inlet water temperature, outlet water temperature, evaporator refrigerant circuit inlet temperature, outlet temperature, and saturated evaporation temperature are compared with the corresponding temperature thresholds under fault conditions. If all values ​​are greater than the temperature threshold corresponding to the fault condition, then a sustain control signal is output. If at least one temperature threshold not greater than the temperature threshold corresponding to the fault condition exists, a load adjustment signal is output.

4. The freeze prevention control method for a heat pump system according to claim 1, characterized by, The adjustment of the load state of the heat pump system based on the real-time temperature parameters includes: The target opening degree of the electronic expansion valve in the heat pump system is determined based on the real-time temperature parameters. Based on the target opening degree, a corresponding control signal is determined from a preset valve opening control table, and the electronic expansion valve is controlled to operate based on the control signal to adjust the load state.

5. The antifreeze control method for a heat pump system according to claim 4, characterized in that, After controlling the electronic expansion valve to operate based on the control signal to adjust the load state, the method further includes: Based on the real-time temperature parameters, determine whether to adjust the refrigerant flow direction; If so, a switching command is output to switch the flow direction of the four-way valve in the heat pump system.

6. The antifreeze control method for a heat pump system according to any one of claims 1-5, characterized in that, Before obtaining the temperature parameters of the unit in the heat pump system, the method further includes: The operating mode and initial operating temperature of the unit in the heat pump system are collected. The initial operating temperature includes the initial inlet water temperature and initial outlet water temperature of the unit, the initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit. Determine whether the operating mode is a cooling mode or a heating / defrosting mode; If it is in cooling mode or heating defrosting mode, the initial inlet water temperature, initial outlet water temperature, initial inlet temperature and initial outlet temperature of the evaporator refrigerant circuit, and the initial saturated evaporation temperature of the unit are compared with the corresponding temperature threshold under non-fault conditions. If at least one temperature threshold less than or equal to the temperature threshold corresponding to the non-fault condition exists, the unit is controlled to enter an anti-freeze fault state and shut down.

7. The antifreeze control method for a heat pump system according to claim 6, characterized in that, After adjusting the load state of the heat pump system based on the real-time temperature parameters, the method further includes: Start the continuous monitoring program to monitor the changes in the temperature parameters of the unit; The load status is adjusted a second time based on the changes in the temperature parameters until a start command or a shutdown command to continue the anti-freeze fault status is received, at which point the monitoring state is exited.

8. An antifreeze control device for a heat pump system, characterized in that, include: The acquisition module is used to acquire the temperature parameters of the unit in the heat pump system, wherein the temperature parameters are the real-time temperature parameters of the heat pump system after it enters the anti-freeze fault state and stops. The identification module is used to identify whether the real-time temperature parameter meets the preset load state adjustment conditions; The adjustment module is used to adjust the load status of the heat pump system according to the real-time temperature parameters if the conditions are met; otherwise, the unit is kept in anti-freeze fault state and shut down while continuing to operate.

9. A heat pump system, characterized in that, The heat pump system includes at least one electrical control cabinet, a memory, and at least one processor, wherein the memory stores instructions; The at least one processor invokes the instructions in the memory to cause the heat pump system to perform the antifreeze control method of the heat pump system as described in any one of claims 1-7.

10. A computer-readable storage medium storing instructions thereon, characterized in that, When the instruction is read and executed, it performs the antifreeze control method for the heat pump system as described in any one of claims 1-7.

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