Dual-system chiller protection method and dual-system chiller

Abstract

The present invention discloses a dual-system chiller protection method and a dual-system chiller, comprising the following steps: S1, collecting data from each transmitter; said collecting data from each transmitter includes collecting first high-pressure and first low-pressure data of a first compressor, collecting second high-pressure and second low-pressure data of a second compressor, collecting first water pressure data of a first water pump, collecting second water pressure data of a second water pump, and collecting water temperature data for cooling the equipment; S2, adjusting the operating status of each component according to the data from each transmitter. It can be seen that through the dual-system design, the normal operation of the system can be guaranteed when a component fails, and a complete core component protection strategy is designed accordingly, which identifies component risks in advance according to core parameters, reduces the unit's operating load, and reduces the unit's failure rate.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature regulation, and in particular to a dual-system chiller protection method and a dual-system chiller. Background Art

[0002] With the increasing adoption of new energy sources like solar and wind power, energy storage technology has also developed. Lithium batteries have gradually become a mainstream energy storage product due to their high energy density, long service life, high rated voltage, high power handling capacity, low self-discharge rate, light weight, environmental friendliness, and virtually no water consumption. Liquid cooling technology is now increasingly being used in container system integration, offering significant advantages in energy savings, minimal temperature fluctuations, and long battery life.

[0003] At the same time, the energy storage system needs to operate continuously for a long time. If the liquid cooling unit is shut down for maintenance and replacement, the system operating costs will increase significantly. However, the reliability development and verification of the liquid cooling unit are not in-depth, the system design and the protection strategy of the core components are not perfect, the failure rate of the core components is high, and it is impossible to ensure that the core components can work for a long time. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a dual-system chiller protection method and a dual-system chiller, which can identify component risks in advance according to core parameters, reduce operating load, and reduce the unit failure rate.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A dual-system chiller protection method comprises the following steps:

[0007] S1. Collect data from each transmitter;

[0008] The data collected from each transmitter includes collecting first high-pressure data and first low-pressure data of the first compressor, collecting second high-pressure data and second low-pressure data of the second compressor, collecting first water pressure data of the first water pump, collecting second water pressure data of the second water pump, and collecting water temperature data for cooling the equipment;

[0009] S2. Adjust the operating status of each device according to the data of each transmitter;

[0010] The adjusting the operating status of each component according to the data of each transmitter includes adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure, adjusting the operation of the first compressor, the second compressor and the condensing fan according to the data of the first low pressure and / or the second low pressure, adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure, and adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature.

[0011] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0012] A dual-system chiller includes a first solenoid valve, a second solenoid valve, a heat exchanger, a battery liquid cooling device, a heater, a temperature transmitter, a first water pressure transmitter, a first water pump, a second water pressure transmitter, a second water pump, an outdoor heat exchanger, a first low-pressure transmitter, a first compressor, a first high-pressure transmitter, a second compressor, a second high-pressure transmitter, a condenser, an expansion valve, and a condensing fan.

[0013] The liquid outlet of the first pipeline of the heat exchanger is connected back to the liquid inlet of the first pipeline via the second solenoid valve, the first solenoid valve and the outdoor heat exchanger; the liquid inlet of the first water pump is connected between the first solenoid valve and the second solenoid valve, and the liquid outlet is connected to one end of the first water pressure transmitter; the liquid inlet of the second water pump is connected between the first solenoid valve and the second solenoid valve, and the liquid outlet is connected to one end of the second water pressure transmitter; the other ends of the first water pressure transmitter and the second water pressure transmitter are connected to the liquid inlet of the first pipeline via the heater, the temperature transmitter and the battery liquid cooling device;

[0014] The liquid outlet end of the second pipeline of the heat exchanger is divided into two paths, one path is connected to one end of the condenser through the first low-pressure transmitter, the first compressor and the first high-pressure transmitter, and the other path is connected to one end of the condenser through the second low-pressure transmitter, the second compressor and the second high-pressure transmitter. The other end of the condenser is connected to the liquid inlet end of the second pipeline through the expansion valve;

[0015] The invention also includes a terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above method is implemented.

[0016] The beneficial effects of the present invention are: a dual-system chiller protection method and a dual-system chiller, which, through the dual-system design, can ensure the normal operation of the system when a certain component fails, and accordingly design a complete core component protection strategy, identify part risks in advance according to core parameters, reduce the unit's operating load, and reduce the unit's failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a dual-system chiller protection method according to an embodiment of the present invention;

[0018] Figure 2 This is a structural diagram of a dual-system chiller according to an embodiment of the present invention;

[0019] Figure 3 2 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

[0020] Description of labels:

[0021] 1. Terminal; 2. Processor; 3. Memory; 9. Condensing fan; 10. Outdoor heat exchanger; 11. First solenoid valve; 12. Second solenoid valve; 13. First water pump; 14. Second water pump; 15. First water pressure transmitter; 16. Second water pressure transmitter; 17. Battery liquid cooling device; 18. First compressor; 19. First low-pressure transmitter; 20. Second low-pressure transmitter; 21. First high-pressure transmitter; 22. Second high-pressure transmitter; 23. Second compressor; 24. Condenser; 25. Heat exchanger; 26. Expansion valve; 27. Heater; 28. Temperature transmitter. DETAILED DESCRIPTION

[0022] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0023] Please refer to Figures 1 to 3 , a dual-system chiller protection method, comprising the steps of:

[0024] S1. Collect data from each transmitter;

[0025] The data collected from each transmitter includes collecting first high-pressure data and first low-pressure data of the first compressor, collecting second high-pressure data and second low-pressure data of the second compressor, collecting first water pressure data of the first water pump, collecting second water pressure data of the second water pump, and collecting water temperature data for cooling the equipment;

[0026] S2. Adjust the operating status of each device according to the data of each transmitter;

[0027] The adjusting the operating status of each component according to the data of each transmitter includes adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure, adjusting the operation of the first compressor, the second compressor and the condensing fan according to the data of the first low pressure and / or the second low pressure, adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure, and adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature.

[0028] From the above description, it can be seen that the beneficial effects of the present invention are: a dual-system chiller protection method and a dual-system chiller, through the dual-system design, can ensure the normal operation of the system when a component fails, and a complete core component protection strategy is designed based on this, which identifies part risks in advance according to core parameters, reduces the unit's operating load, and reduces the unit's failure rate.

[0029] Furthermore,

[0030] The method of adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure comprises the steps of:

[0031] S211: If the first high pressure is greater than the first set high pressure and less than or equal to the second set high pressure, execute step S212; if the first high pressure is greater than the second set high pressure and less than or equal to the third set high pressure, execute step S213; if the first high pressure is greater than the third set high pressure, execute step S214;

[0032] S212, controlling the first compressor to operate at the first set duty cycle of the first compressor and the second compressor to operate at the first set duty cycle of the second compressor until the first high pressure is less than the fourth set high pressure, and then controlling the first compressor and the second compressor to operate in the initial state;

[0033] S213, controlling the first compressor to operate at the second set duty cycle of the first compressor and the second compressor to operate at the second set duty cycle of the second compressor until the first high pressure is lower than the first set high pressure, then controlling the first compressor to operate at the first set duty cycle and the second compressor to operate at the first set duty cycle of the second compressor;

[0034] S214, controlling the first compressor to operate at the third set duty cycle of the first compressor and the second compressor to operate at the third set duty cycle of the second compressor until the first high pressure is less than the first set high pressure, then controlling the first compressor to operate at the second set duty cycle and the second compressor to operate at the second set duty cycle of the second compressor, and during the process, if the first high pressure continues for a first set time period that is greater than or equal to the third set high pressure, controlling the chiller to standby;

[0035] The third set high pressure is greater than the second set high pressure, greater than the first set high pressure, greater than the fourth set high pressure; the third set duty cycle of the first compressor is equal to the third set duty cycle of the second compressor, greater than the second set duty cycle of the second compressor, greater than the first set duty cycle of the second compressor, greater than the first set duty cycle of the first compressor; the first set duty cycle of the second compressor is greater than the second set duty cycle of the first compressor.

[0036] From the above description, it can be seen that the operation of the first compressor and the second compressor is adjusted according to the data of the first high pressure and / or the second high pressure, ensuring that the high pressure meets the demand and the overall operation is stable.

[0037] Furthermore,

[0038] The step of adjusting the operation of the first compressor, the second compressor, and the condensing fan according to the data of the first low pressure and / or the second low pressure includes:

[0039] Step S221: determine whether the first low pressure is less than or equal to the first set low pressure value or whether the second low pressure is less than or equal to the first set low pressure value. If so, execute step S222;

[0040] S222, controlling the condensing fan to operate at a first set duty cycle of the condensing fan, and setting the first compressor to operate at the first set duty cycle of the first compressor for a second set time, and then executing step S223;

[0041] Alternatively, the condensing fan is controlled to operate at a first set duty cycle of the condensing fan, and the second compressor is set to standby for a second set time, and then step S223 is executed;

[0042] S223, determining whether the first low pressure is greater than the first set low pressure value and the second low pressure is greater than the first set low pressure value, if so, controlling the first compressor, the second compressor and the condensing fan to keep running in the initial state, if not, executing step S224;

[0043] S224, determining whether the first low pressure is less than or equal to the second set low pressure value or the second low pressure is less than or equal to the second set low pressure value for a continuous third set time period, if so, executing step S225, if not, controlling the chiller to standby;

[0044] S225, controlling the condensing fan to operate at the second set duty cycle of the condensing fan, the first compressor to operate at the fourth set duty cycle of the first compressor, and the second compressor to standby;

[0045] Or the condensing fan is set to operate at a second set duty cycle of the condensing fan, the first compressor is on standby, and the second compressor operates in an initial state.

[0046] From the above description, it can be seen that the operation of the first compressor, the second compressor and the condensing fan is adjusted according to the data of the first low pressure and / or the second low pressure, thereby ensuring the safety of the compressor and the stability of the overall operation.

[0047] Further,

[0048] The method of adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure comprises the steps of:

[0049] S231, determining whether the first water pressure is greater than or equal to the first set water pressure, if so, executing step S232;

[0050] S232, controlling the first water pump to operate at the first water pump set adjusted duty cycle, and the second water pump to operate at the second water pump set adjusted duty cycle, and then continuously determining the first water pressure. If the first water pressure is greater than or equal to the second set water pressure and less than or equal to the first set water pressure for a fourth set duration, then controlling the first water pump to stop and the second water pump to operate at full load. If not, then controlling the chiller to standby.

[0051] The first water pump setting adjustment duty cycle is smaller than the second water pump setting adjustment duty cycle, and the first set water pressure is greater than the second set water pressure.

[0052] As can be seen from the above description, the operation of the first water pump and the second water pump is adjusted according to the data of the first water pressure and / or the second water pressure, thereby ensuring the overall stable operation of the system and the stability of the water pumps.

[0053] Further,

[0054] The method of adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature specifically includes the following steps:

[0055] S241: If the water temperature is greater than the first water temperature and less than or equal to the second water temperature, execute step S242; if the water temperature is greater than the second water temperature and less than or equal to the third water temperature, execute step S243; if the water temperature is greater than the third water temperature, execute step S244;

[0056] S242, controlling the second compressor to operate at a fourth set duty cycle until the water temperature remains less than or equal to the fourth water temperature for a fifth set time period, and then controlling the second compressor to operate in an initial state;

[0057] S243, controlling the condensing fan to operate at the third set duty cycle of the condensing fan and the second compressor to operate at the second set duty cycle of the second compressor until the water temperature is continuously less than the first water temperature for a fifth set time period, and then controlling the second compressor to operate at the fourth set duty cycle of the second compressor and the fan to operate in the initial state;

[0058] S244. Control the first compressor to operate at the third set duty cycle of the first compressor and the second compressor to operate at the third set duty cycle of the second compressor and the condensing fan to operate at the fourth set duty cycle of the condensing fan. Then, continue to judge the water temperature within the sixth set time period. If the water temperature is lower than the first water temperature, control the condensing fan to operate at the third set duty cycle of the condensing fan and the second compressor to operate at the second set duty cycle of the second compressor and the first compressor to operate in the initial state. If the water temperature is still greater than or equal to the first water temperature after the sixth set time period, control the chiller to standby.

[0059] From the above description, it can be seen that the operation of the first compressor, the second compressor and the condensing fan are adjusted according to the water temperature, ensuring that the cooling capacity meets the demand.

[0060] Furthermore, the first set high pressure is specifically 24.9 bar, the second set high pressure is specifically 27.9 bar, the third set high pressure is specifically 31.9 bar, the fourth set high pressure is specifically 21 bar, the first set duty cycle of the first compressor is 50% duty cycle, the first set duty cycle of the second compressor is 60% duty cycle, the second set duty cycle of the first compressor is specifically 50% duty cycle, the second set duty cycle of the second compressor is specifically 75% duty cycle, the third set duty cycle of the first compressor is 100% duty cycle, the third set duty cycle of the second compressor is 100%, the first set low pressure value is specifically 3 bar, the first set duty cycle of the condensing fan is specifically 70% of the duty cycle, the second set duty cycle of the condensing fan is specifically 85% duty cycle, the first The fourth set duty cycle of the compressor is specifically a 25% duty cycle, the second set low pressure is specifically 2 bar, the first set water pressure is specifically 4 bar, the first water pump adjusts the duty cycle of the first water pump setting to be specifically a 25% duty cycle, the second water pump adjusts the duty cycle to be specifically 75% duty cycle, the second set water pressure is specifically 2.5 bar, the first water temperature is specifically 35 degrees Celsius, the second water temperature is specifically 40 degrees Celsius, the third water temperature is specifically 45 degrees Celsius, the fourth water temperature is specifically 30 degrees Celsius, the fourth set duty cycle of the second compressor is specifically a 50% duty cycle, the fifth set time is specifically 3 minutes, the third set duty cycle of the condensing fan is specifically 75% duty cycle, the sixth set time is specifically 1 hour, and the fourth set duty cycle of the condensing fan is specifically 100% duty cycle.

[0061] As can be seen from the above description, specific parameters of the operation are given.

[0062] Furthermore, the method further includes step S0, initialization, so that each device operates in an initial state;

[0063] The device includes a first compressor, a second compressor, a first water pump, a second water pump and a condensing fan.

[0064] It can be seen from the above description that the initialization operation of the chiller is achieved.

[0065] Furthermore, the initial state is specifically that the first compressor operates at 75% duty cycle of the first compressor, the second compressor operates at 25% duty cycle of the second compressor, the condensing fan operates at 50% duty cycle of the condensing fan, the first water pump operates at 75% duty cycle of the first water pump, and the second water pump operates at 25% duty cycle of the second water pump.

[0066] From the above description, it can be seen that the parameters for the initial operation of the chiller are given.

[0067] Furthermore, the priority is from high to low as follows: adjusting the operating status of each component according to the data of each transmitter includes adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure; adjusting the operation of the first compressor, the second compressor and the condensing fan according to the data of the first low pressure and / or the second low pressure; adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure; and adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature.

[0068] From the above description, we can see that according to the priority, the first priority is to ensure the high pressure value to stabilize the compressor and pipeline, the second priority is to ensure the low pressure to prevent damage to the compressor, the third priority is to prevent damage to the water pump, and finally to ensure sufficient cooling.

[0069] A dual-system chiller, comprising a first solenoid valve, a second solenoid valve, a heat exchanger, a battery liquid cooling device, a heater, a temperature transmitter, a first water pressure transmitter, a first water pump, a second water pressure transmitter, a second water pump, an outdoor heat exchanger, a first low-pressure transmitter, a first compressor, a first high-pressure transmitter, a second compressor, a second high-pressure transmitter, a condenser, an expansion valve, and a condensing fan;

[0070] The liquid outlet of the first pipeline of the heat exchanger is connected back to the liquid inlet of the first pipeline via the second solenoid valve, the first solenoid valve and the outdoor heat exchanger; the liquid inlet of the first water pump is connected between the first solenoid valve and the second solenoid valve, and the liquid outlet is connected to one end of the first water pressure transmitter; the liquid inlet of the second water pump is connected between the first solenoid valve and the second solenoid valve, and the liquid outlet is connected to one end of the second water pressure transmitter; the other ends of the first water pressure transmitter and the second water pressure transmitter are connected to the liquid inlet of the first pipeline via the heater, the temperature transmitter and the battery liquid cooling device;

[0071] The liquid outlet end of the second pipeline of the heat exchanger is divided into two paths, one of which is connected to one end of the condenser via the first low-pressure transmitter, the first compressor and the first high-pressure transmitter, and the other is connected to one end of the condenser via the second low-pressure transmitter, the second compressor and the second high-pressure transmitter. The other end of the condenser is connected to the liquid inlet end of the second pipeline via the expansion valve. The condensing fan dissipates heat for the condenser and the outdoor heat exchanger.

[0072] It also includes a terminal, which is connected to the unit body for communication and control. The terminal includes a memory, a processor, and a computer program stored in the memory and runnable on the processor. It is characterized in that the above method is implemented when the processor executes the computer program.

[0073] The present invention is used in various equipment using water cooling systems, especially in container energy storage systems.

[0074] Please refer to Figure 1 , embodiment 1 of the present invention is:

[0075] When the ambient temperature is within the range of 0-45°C, the first solenoid valve is closed and the second solenoid valve is opened, and the refrigeration circuit operates normally to complete the cooling of the battery cluster.

[0076] When the ambient temperature is within the range of -40-0℃, the first solenoid valve is opened and the second solenoid valve is closed, the refrigeration circuit does not work, achieving maximum energy saving at low temperatures, and the condensing fan and the outdoor heat exchanger work to directly cool the coolant.

[0077] A dual-system chiller protection method, when the refrigeration circuit is operating, comprises the following steps:

[0078] S0, initialization, makes each device run in the initial state.

[0079] In this embodiment, the device includes a first compressor, a second compressor, a first water pump, a second water pump and a condensing fan.

[0080] The initial state is specifically that the first compressor runs at a 75% duty cycle, the second compressor runs at a 25% duty cycle, the condensing fan runs at a 50% duty cycle, the first water pump runs at a 75% duty cycle, and the second water pump runs at a 25% duty cycle.

[0081] S1. Collect data from each transmitter.

[0082] The data collected from each transmitter specifically includes the first high pressure data and the first low pressure data of the first compressor, the second high pressure data and the second low pressure data of the second compressor, the first water pressure data of the first water pump, the second water pressure data of the second water pump, and the water temperature data used to cool the equipment.

[0083] Among them, the first high pressure and the second high pressure are used to detect the pressure of the refrigerant on the high-pressure side of the compressor when it is working. The higher the pressure, the greater the load; the first low pressure and the second low pressure are used to detect the pressure of the refrigerant on the low-pressure side of the compressor when it is working. If the pressure is lower than a certain value, it means that the compressor is abnormal or the refrigerant gas and liquid are mixed and cannot work; the first water pressure and the second water pressure are used to detect the operating status of the water pump.

[0084] S2. Adjust the operating status of each device according to the data of each transmitter.

[0085] Specifically, it includes adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure, adjusting the operation of the first compressor, the second compressor and the condensing fan according to the data of the first low pressure and / or the second low pressure, adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure, and adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature.

[0086] The step of adjusting the operation of the first compressor and the second compressor according to the first high pressure data and / or the second high pressure data specifically includes the following steps:

[0087] S211. If the first high voltage is greater than the first set high voltage and less than or equal to the second set high voltage, execute step S212; if the first high voltage is greater than the second set high voltage and less than or equal to the third set high voltage, execute step S213; if the first high voltage is greater than the third set high voltage, execute step S214.

[0088] In this embodiment, the first set high pressure is specifically 24.9 bar, the second set high pressure is specifically 27.9 bar, and the third set high pressure is specifically 31.9 bar.

[0089] S212 , controlling the first compressor to operate at the first set duty cycle of the first compressor and the second compressor to operate at the first set duty cycle of the second compressor until the first high pressure is less than the fourth set high pressure, and then controlling the first compressor and the second compressor to operate in the initial state.

[0090] The first set duty cycle of the first compressor is specifically to reduce the first set power reduction based on the initial state of the first compressor, and the first set duty cycle of the second compressor is to increase the first set power increase based on the initial state of the second compressor, and the first set power increase is greater than the first set power reduction.

[0091] In this embodiment, the fourth set high pressure is specifically 21 bar, the first set duty cycle of the first compressor is 50% duty cycle, and the first set duty cycle of the second compressor is 60% duty cycle.

[0092] The purpose is to reduce the load of the first compressor to prevent excessive high pressure from damaging the compressor, and the increase in the second compressor is greater than the decrease in the first compressor, so as to increase the cooling capacity of the system, quickly reduce the high pressure, and prevent the compressor from being overloaded and causing high pressure.

[0093] S213, controlling the first compressor to operate at the second set duty cycle of the first compressor and the second compressor to operate at the second set duty cycle of the second compressor until the first high pressure is less than the first set high pressure, and then controlling the first compressor to operate at the first set duty cycle and the second compressor to operate at the first set duty cycle of the second compressor.

[0094] In this embodiment, the second set duty cycle of the first compressor is specifically a 50% duty cycle, and the second set duty cycle of the second compressor is specifically a 75% duty cycle.

[0095] S214, control the first compressor to operate at the third set duty cycle of the first compressor and the second compressor to operate at the third set duty cycle of the second compressor until the first high pressure is less than the first set high pressure, then control the first compressor to operate at the second set duty cycle and the second compressor to operate at the second set duty cycle of the second compressor, and during the process, if the first high pressure continues for a first set time length that is greater than or equal to the third set high pressure, control the chiller to standby.

[0096] In this embodiment, the third set duty cycle of the first compressor is 100% duty cycle, and the third set duty cycle of the second compressor is 100%.

[0097] The step of adjusting the operation of the first compressor, the second compressor, and the condensing fan according to the data of the first low pressure and / or the second low pressure specifically includes:

[0098] Step S221: Determine whether the first low pressure is less than or equal to the first set low pressure value or whether the second low pressure is less than or equal to the first set low pressure value. If so, execute step S222.

[0099] The first set low pressure value is specifically 3 bar.

[0100] S222, controlling the condensing fan to operate at a first set duty cycle of the condensing fan, and setting the first compressor to operate at the first set duty cycle of the first compressor for a second set time, and then executing step S223;

[0101] Alternatively, the condensing fan is controlled to operate at a first set duty cycle of the condensing fan, and step S223 is executed after the second compressor is set to standby for a second set time period.

[0102] In this embodiment, the first set duty cycle of the condensing fan is specifically 70% of the duty cycle.

[0103] S223. Determine whether the first low pressure is greater than the first set low pressure value and the second low pressure is greater than the first set low pressure value. If so, control the first compressor, the second compressor and the condensing fan to keep running in the initial state. If not, execute step S224.

[0104] S224, determine whether the first low pressure is less than or equal to the second set low pressure value or the second low pressure is less than or equal to the second set low pressure value within the third set time period. If so, execute step S225; otherwise, control the chiller to standby.

[0105] S225, controlling the condensing fan to operate at the second set duty cycle of the condensing fan, the first compressor to operate at the fourth set duty cycle of the first compressor, and the second compressor to standby;

[0106] Alternatively, the condensing fan is set to operate at a second set duty cycle for the condensing fan, the first compressor is on standby, and the second compressor is operated in an initial state. In this embodiment, the second set duty cycle for the condensing fan is specifically an 85% duty cycle, the fourth set duty cycle for the first compressor is specifically a 25% duty cycle, and the second set low pressure is specifically 2 bar.

[0107] The method of adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure comprises the steps of:

[0108] S231. Determine whether the first water pressure is greater than or equal to the first set water pressure. If so, execute step S232.

[0109] In this embodiment, the first set water pressure is specifically 4 bar.

[0110] S232, control the first water pump to operate with the duty cycle adjusted by the first water pump setting, and the second water pump to operate with the duty cycle adjusted by the second water pump setting, and then continuously judge the first water pressure. If the first water pressure is greater than or equal to the second set water pressure and less than or equal to the first set water pressure for a fourth consecutive set duration, control the first water pump to stop and the second water pump to operate at full load. If not, control the chiller to standby.

[0111] In this embodiment, the first water pump is set to adjust the duty cycle to be 25% duty cycle, the second water pump is set to adjust the duty cycle to be 75% duty cycle, and the second set water pressure is specifically 2.5 bar.

[0112] The method of adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature specifically includes the following steps:

[0113] S241: If the water temperature is greater than the first water temperature and less than or equal to the second water temperature, execute step S242; if the water temperature is greater than the second water temperature and less than or equal to the third water temperature, execute step S243; if the water temperature is greater than the third water temperature, execute step S244.

[0114] In this embodiment, the first water temperature is specifically 35 degrees Celsius, the second water temperature is specifically 40 degrees Celsius, and the third water temperature is specifically 45 degrees Celsius.

[0115] S242: Control the second compressor to operate at the fourth set duty cycle until the water temperature is less than or equal to the fourth water temperature for a fifth set time period, and then control the second compressor to operate in the initial state.

[0116] In this embodiment, the fourth water temperature is specifically 30 degrees Celsius, the fourth set duty cycle of the second compressor is specifically 50% duty cycle, and the fifth set time is specifically 3 minutes.

[0117] S243, control the condensing fan to operate at the third set duty cycle of the condensing fan and the second compressor to operate at the second set duty cycle of the second compressor until the water temperature is less than the first water temperature for a fifth set time, and then control the second compressor to operate at the fourth set duty cycle of the second compressor and the fan to operate in the initial state.

[0118] In this embodiment, the third set duty cycle of the condensing fan is specifically a 75% duty cycle.

[0119] S244. Control the first compressor to operate at the third set duty cycle of the first compressor and the second compressor to operate at the third set duty cycle of the second compressor and the condensing fan to operate at the fourth set duty cycle of the condensing fan. Then, continue to judge the water temperature within the sixth set time period. If the water temperature is lower than the first water temperature, control the condensing fan to operate at the third set duty cycle of the condensing fan and the second compressor to operate at the second set duty cycle of the second compressor and the first compressor to operate in the initial state. If the water temperature is still greater than or equal to the first water temperature after the sixth set time period, control the chiller to standby.

[0120] In this embodiment, the sixth set duration is specifically 1 hour, and the fourth set duty cycle of the condensing fan is specifically 100% duty cycle.

[0121] In this embodiment, the operation of the first compressor and the second compressor is adjusted according to the data of the first high pressure and / or the second high pressure, the operation of the first compressor, the second compressor and the condensing fan is adjusted according to the data of the first low pressure and / or the second low pressure, the operation of the first water pump and the second water pump is adjusted according to the data of the first water pressure and / or the second water pressure, and the operation of the first compressor, the second compressor and the condensing fan is adjusted according to the water temperature. These can be processed in parallel or in sequence according to priority.

[0122] In this embodiment, the priorities are from high to low as follows: adjusting the operating status of each component according to the data of each transmitter includes adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure; adjusting the operation of the first compressor, the second compressor and the condensing fan according to the data of the first low pressure and / or the second low pressure; adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure; and adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature.

[0123] Please refer to Figure 2-3 , the second embodiment of the present invention is:

[0124] A dual-system chiller includes a terminal 1 and a unit body, wherein the unit body includes a first solenoid valve 11, a second solenoid valve 12, a heat exchanger 25, a battery liquid cooling device 17, a heater 27, a temperature transmitter 28, a first water pressure transmitter 15, a first water pump 13, a second water pressure transmitter 16, a second water pump 14, an outdoor heat exchanger 10, a first low-pressure transmitter 19, a first compressor 18, a first high-pressure transmitter 21, a second compressor 23, a second high-pressure transmitter 22, a condenser 24, an expansion valve 26, and a condensing fan 9;

[0125] The liquid outlet of the first pipeline of the heat exchanger 25 is connected back to the liquid inlet of the first pipeline via the second solenoid valve 12, the first solenoid valve 11 and the outdoor heat exchanger 10;

[0126] The first water pump 13 has a liquid inlet connected between the first solenoid valve 11 and the second solenoid valve 12, and a liquid outlet connected to one end of the first water pressure transmitter 15. The second water pump 14 has a liquid inlet connected between the first solenoid valve 11 and the second solenoid valve 12, and a liquid outlet connected to one end of the second water pressure transmitter 16. The other ends of the first and second water pressure transmitters 15 and 16 are connected to the liquid inlet of the first pipeline via a heater 27, a temperature transmitter 28, and a battery liquid cooling device 17.

[0127] The liquid outlet of the second pipeline of the heat exchanger 25 is divided into two paths. One path is connected to one end of the condenser 24 through the first low-pressure transmitter 19, the first compressor 18 and the first high-pressure transmitter 21. The other path is connected to one end of the condenser 24 through the second low-pressure transmitter 20, the second compressor 23 and the second high-pressure transmitter 22. The other end of the condenser 24 is connected to the liquid inlet end of the second pipeline through the expansion valve 26. The condensing fan 9 dissipates heat for the condenser 24 and the outdoor heat exchanger 10.

[0128] The dual-system chiller also includes a terminal 1, which is connected to the unit body for communication and control. The terminal 1 includes a memory 3, a processor 2, and a computer program stored in the memory 3 and executable on the processor 2. When the processor 2 executes the computer program, the steps of the above-mentioned embodiment 1 are implemented.

[0129] In summary, the present invention provides a dual-system chiller protection method and dual-system chiller. Through the dual-system design, when a component fails, the normal operation of the system can be guaranteed. Based on this, a complete core component protection strategy is designed to identify component risks in advance according to core parameters, reduce the operating load of the unit, and reduce the failure rate of the unit.

[0130] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dual-system chiller protection method, characterized in that: Including steps: S1. Collect data from each transmitter; The data collected from each transmitter includes collecting first high-pressure data and first low-pressure data of the first compressor, collecting second high-pressure data and second low-pressure data of the second compressor, collecting first water pressure data of the first water pump, collecting second water pressure data of the second water pump, and collecting water temperature data for cooling the equipment; S2. Adjust the operating status of each device according to the data of each transmitter; The adjusting the operating status of each component according to the data of each transmitter includes adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure, adjusting the operation of the first compressor, the second compressor and the condensing fan according to the data of the first low pressure and / or the second low pressure, adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure, and adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature.

2. A dual-system chiller protection method according to claim 1, characterized in that: The method of adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure comprises the steps of: S211: If the first high pressure is greater than the first set high pressure and less than or equal to the second set high pressure, execute step S212; if the first high pressure is greater than the second set high pressure and less than or equal to the third set high pressure, execute step S213; if the first high pressure is greater than the third set high pressure, execute step S214; S212, controlling the first compressor to operate at the first set duty cycle of the first compressor and the second compressor to operate at the first set duty cycle of the second compressor until the first high pressure is less than the fourth set high pressure, and then controlling the first compressor and the second compressor to operate in the initial state; S213, controlling the first compressor to operate at the second set duty cycle of the first compressor and the second compressor to operate at the second set duty cycle of the second compressor until the first high pressure is lower than the first set high pressure, then controlling the first compressor to operate at the first set duty cycle and the second compressor to operate at the first set duty cycle of the second compressor; S214, controlling the first compressor to operate at the third set duty cycle of the first compressor and the second compressor to operate at the third set duty cycle of the second compressor until the first high pressure is less than the first set high pressure, then controlling the first compressor to operate at the second set duty cycle and the second compressor to operate at the second set duty cycle of the second compressor, and during the process, if the first high pressure continues for a first set time period that is greater than or equal to the third set high pressure, controlling the chiller to standby; The third set high pressure is greater than the second set high pressure, greater than the first set high pressure, greater than the fourth set high pressure; the third set duty cycle of the first compressor is equal to the third set duty cycle of the second compressor, greater than the second set duty cycle of the second compressor, greater than the first set duty cycle of the second compressor, greater than the first set duty cycle of the first compressor; the first set duty cycle of the second compressor is greater than the second set duty cycle of the first compressor.

3. A dual-system chiller protection method according to claim 2, characterized in that: The step of adjusting the operation of the first compressor, the second compressor, and the condensing fan according to the data of the first low pressure and / or the second low pressure includes: Step S221: determine whether the first low pressure is less than or equal to the first set low pressure value or whether the second low pressure is less than or equal to the first set low pressure value. If so, execute step S222; S222, controlling the condensing fan to operate at a first set duty cycle of the condensing fan, and setting the first compressor to operate at the first set duty cycle of the first compressor for a second set time, and then executing step S223; Alternatively, the condensing fan is controlled to operate at a first set duty cycle of the condensing fan, and the second compressor is set to standby for a second set time, and then step S223 is executed; S223, determining whether the first low pressure is greater than the first set low pressure value and the second low pressure is greater than the first set low pressure value, if so, controlling the first compressor, the second compressor and the condensing fan to keep running in the initial state, if not, executing step S224; S224, determining whether the first low pressure is less than or equal to the second set low pressure value or the second low pressure is less than or equal to the second set low pressure value for a continuous third set time period, if so, executing step S225, if not, controlling the chiller to standby; S225, controlling the condensing fan to operate at the second set duty cycle of the condensing fan, the first compressor to operate at the fourth set duty cycle of the first compressor, and the second compressor to standby; Or the condensing fan is set to operate at a second set duty cycle of the condensing fan, the first compressor is on standby, and the second compressor operates in an initial state.

4. A dual-system chiller protection method according to claim 3, characterized in that: The method of adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure comprises the steps of: S231, determining whether the first water pressure is greater than or equal to the first set water pressure, if so, executing step S232; S232, controlling the first water pump to operate at the first water pump set adjusted duty cycle, and the second water pump to operate at the second water pump set adjusted duty cycle, and then continuously determining the first water pressure. If the first water pressure is greater than or equal to the second set water pressure and less than or equal to the first set water pressure for a fourth set duration, then controlling the first water pump to stop and the second water pump to operate at full load. If not, then controlling the chiller to standby. The first water pump setting adjustment duty cycle is smaller than the second water pump setting adjustment duty cycle, and the first set water pressure is greater than the second set water pressure.

5. A dual-system chiller protection method according to claim 4, characterized in that: The method of adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature specifically includes the following steps: S241: If the water temperature is greater than the first water temperature and less than or equal to the second water temperature, execute step S242; if the water temperature is greater than the second water temperature and less than or equal to the third water temperature, execute step S243; if the water temperature is greater than the third water temperature, execute step S244; S242, controlling the second compressor to operate at a fourth set duty cycle until the water temperature remains less than or equal to the fourth water temperature for a fifth set time period, and then controlling the second compressor to operate in an initial state; S243, controlling the condensing fan to operate at the third set duty cycle of the condensing fan and the second compressor to operate at the second set duty cycle of the second compressor until the water temperature is continuously less than the first water temperature for a fifth set time period, and then controlling the second compressor to operate at the fourth set duty cycle of the second compressor and the fan to operate in the initial state; S244. Control the first compressor to operate at the third set duty cycle of the first compressor and the second compressor to operate at the third set duty cycle of the second compressor and the condensing fan to operate at the fourth set duty cycle of the condensing fan. Then, continue to judge the water temperature within the sixth set time period. If the water temperature is lower than the first water temperature, control the condensing fan to operate at the third set duty cycle of the condensing fan and the second compressor to operate at the second set duty cycle of the second compressor and the first compressor to operate in the initial state. If the water temperature is still greater than or equal to the first water temperature after the sixth set time period, control the chiller to standby.

6. A dual-system chiller protection method according to claim 5, characterized in that: The first set high pressure is specifically 24.9 bar, the second set high pressure is specifically 27.9 bar, the third set high pressure is specifically 31.9 bar, the fourth set high pressure is specifically 21 bar, the first set duty cycle of the first compressor is 50% duty cycle, the first set duty cycle of the second compressor is 60% duty cycle, the second set duty cycle of the first compressor is specifically 50% duty cycle, the second set duty cycle of the second compressor is specifically 75% duty cycle, the third set duty cycle of the first compressor is 100% duty cycle, the third set duty cycle of the second compressor is 100%, the first set low pressure value is specifically 3 bar, the first set duty cycle of the condensing fan is specifically 70% of the duty cycle, the second set duty cycle of the condensing fan is specifically 85% duty cycle, the first compressor is The fourth set duty cycle of the machine is specifically a 25% duty cycle, the second set low pressure is specifically 2 bar, the first set water pressure is specifically 4 bar, the first water pump is set to adjust the duty cycle of the first water pump to be 25% duty cycle, the second water pump is set to adjust the duty cycle to be 75% duty cycle, the second set water pressure is specifically 2.5 bar, the first water temperature is specifically 35 degrees Celsius, the second water temperature is specifically 40 degrees Celsius, the third water temperature is specifically 45 degrees Celsius, the fourth water temperature is specifically 30 degrees Celsius, the fourth set duty cycle of the second compressor is specifically 50% duty cycle, the fifth set time is specifically 3 minutes, the third set duty cycle of the condensing fan is specifically 75% duty cycle, the sixth set time is specifically 1 hour, and the fourth set duty cycle of the condensing fan is specifically 100% duty cycle.

7. A dual-system chiller protection method according to claim 6, characterized in that: The step S0 is further included, initializing each device to operate in an initial state; The device includes a first compressor, a second compressor, a first water pump, a second water pump and a condensing fan.

8. A dual-system chiller protection method according to claim 7, characterized in that: The initial state is specifically that the first compressor operates at 75% duty cycle of the first compressor, the second compressor operates at 25% duty cycle of the second compressor, the condensing fan operates at 50% duty cycle of the condensing fan, the first water pump operates at 75% duty cycle of the first water pump, and the second water pump operates at 25% duty cycle of the second water pump.

9. A dual-system chiller protection method according to claim 1, characterized in that: The priorities are from high to low as follows: adjusting the operating status of each component according to the data of each transmitter includes adjusting the operation of the first compressor and the second compressor according to the data of the first high pressure and / or the second high pressure; adjusting the operation of the first compressor, the second compressor and the condensing fan according to the data of the first low pressure and / or the second low pressure; adjusting the operation of the first water pump and the second water pump according to the data of the first water pressure and / or the second water pressure; and adjusting the operation of the first compressor, the second compressor and the condensing fan according to the water temperature.

10. A dual-system chiller, characterized in that: The terminal comprises a unit body, wherein the unit body comprises a first solenoid valve, a second solenoid valve, a heat exchanger, a battery liquid cooling device, a heater, a temperature transmitter, a first water pressure transmitter, a first water pump, a second water pressure transmitter, a second water pump, an outdoor heat exchanger, a first low-pressure transmitter, a first compressor, a first high-pressure transmitter, a second compressor, a second high-pressure transmitter, a condenser, an expansion valve, and a condensing fan; The liquid outlet of the first pipeline of the heat exchanger is connected back to the liquid inlet of the first pipeline via the second solenoid valve, the first solenoid valve and the outdoor heat exchanger; The first water pump has a liquid inlet connected between the first solenoid valve and the second solenoid valve, and a liquid outlet connected to one end of the first water pressure transmitter. The second water pump has a liquid inlet connected between the first solenoid valve and the second solenoid valve, and a liquid outlet connected to one end of the second water pressure transmitter. The other ends of the first and second water pressure transmitters are connected to the liquid inlet of the first pipeline via a heater, a temperature transmitter, and a battery liquid cooling device. The liquid outlet end of the second pipeline of the heat exchanger is divided into two paths, one path is connected to one end of the condenser through the first low-pressure transmitter, the first compressor and the first high-pressure transmitter, and the other path is connected to one end of the condenser through the second low-pressure transmitter, the second compressor and the second high-pressure transmitter. The other end of the condenser is connected to the liquid inlet end of the second pipeline through the expansion valve. The condensing fan dissipates heat for the condenser and the outdoor heat exchanger; The terminal is connected to the unit body for communication and control. The terminal includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method described in any one of claims 1 to 9 is implemented.

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