Control method and device of water chilling unit, water chilling unit, storage medium and electronic equipment

Abstract

The invention provides a control method and device of a water chilling unit, the water chilling unit, a storage medium and electronic device.The method comprises the steps that the working state of a first compressor of the water chilling unit is detected, the water chilling unit comprises the first compressor, a second compressor, a condenser and an evaporator, the condenser comprises a first condensation area and a second condensation area, and the evaporator is connected with the first compressor; the evaporator comprises a first evaporation area and a second evaporation area, the first compressor is connected in a first refrigeration loop where the first condensation area and the first evaporation area are located, and the second compressor is connected in a second refrigeration loop where the second condensation area and the second evaporation area are located; based on the working state, it is determined that the first compressor breaks down, the first condensation area and the first evaporation area are combined into a second refrigeration loop, and a third refrigeration loop is obtained; and controlling the second compressor based on the third refrigerating loop. By adopting the scheme of the embodiment, the technical problem that the refrigerating capacity is reduced due to faults of part of compressors in the multi-system water chilling unit in the related technology is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a control method and device of a water chiller, a water chiller, a storage medium and an electronic device. BACKGROUND

[0002] In related technologies, the multi-system water chillers on the market are mainly divided into refrigerant independent multi-system and refrigerant non-independent multi-system.

[0003] The refrigerant independent multi-system and the refrigerant non-independent multi-system have the following advantages and disadvantages: in the refrigerant independent multi-system, each system is independently controlled when the unit is normally running, which is convenient for balancing the refrigerant system and the lubricating oil system, and when a compressor of a certain system fails and stops, the independent system stops running, and the heat exchange capacity of the water chiller is reduced by 1 / N (N is the number of independent systems of the water chiller). In the refrigerant non-independent multi-system, when a compressor of a certain system fails and stops, only the compressor needs to be closed, and the heat exchange area of the evaporator and the condenser is still not reduced, and when the unit is normally running, the refrigerant system and the lubricating oil system of each system are prone to imbalance. The disadvantages of the two kinds of multi-system water chillers are obvious.

[0004] In view of the above problems in related technologies, no efficient and accurate solution has been found. SUMMARY

[0005] The present application provides a control method and device of a water chiller, a water chiller, a storage medium and an electronic device to solve the technical problems in related technologies.

[0006] According to one embodiment of the present application, a control method of a water chiller is provided, comprising: detecting a working state of a first compressor of a water chiller, wherein the water chiller comprises the first compressor, a second compressor, a condenser and an evaporator, the condenser comprises a first condensing area and a second condensing area, the evaporator comprises a first evaporating area and a second evaporating area, the first compressor is connected in a first refrigeration circuit in which the first condensing area and the first evaporating area are located, and the second compressor is connected in a second refrigeration circuit in which the second condensing area and the second evaporating area are located; determining that the first compressor fails based on the working state, merging the first condensing area and the first evaporating area to the second refrigeration circuit to obtain a third refrigeration circuit; controlling the second compressor based on the third refrigeration circuit.

[0007] Optionally, controlling the second compressor based on the third refrigeration circuit comprises: acquiring a real-time outlet water temperature of chilled water of the third refrigeration circuit; controlling the second compressor according to the first chilled water real-time outlet temperature and a chilled water target set value.

[0008] Optionally, controlling the second compressor according to the first chilled water real-time outlet temperature and a chilled water target set value comprises: determining whether the first chilled water real-time outlet temperature is less than or equal to the chilled water target set value; if the first chilled water real-time outlet temperature is less than or equal to the chilled water target set value, controlling the second compressor to maintain a current rotating speed to continue running.

[0009] Optionally, controlling the second compressor according to the first chilled water real-time outlet temperature and a chilled water target set value comprises: determining whether the first chilled water real-time outlet temperature is less than or equal to the chilled water target set value; if the first chilled water real-time outlet temperature is greater than the chilled water target set value, controlling the second compressor to increase a current rotating speed.

[0010] Optionally, controlling the second compressor to increase a current rotating speed comprises: controlling the current rotating speed of the second compressor to increase to a first target rotating speed; continuously collecting a second chilled water real-time outlet temperature of the third refrigeration circuit; determining whether the second chilled water real-time outlet temperature is less than or equal to the chilled water target set value; if the second chilled water real-time outlet temperature is less than or equal to the chilled water target set value, controlling the second compressor to maintain the first target rotating speed to continue running; if the second chilled water real-time outlet temperature is greater than the chilled water target set value, determining whether the first target rotating speed reaches a predetermined maximum rotating speed; if the first target rotating speed has reached the predetermined maximum rotating speed, controlling the second compressor to maintain the first target rotating speed to continue running; if the first target rotating speed has not reached the predetermined maximum rotating speed, controlling the second compressor to increase from the first target rotating speed to a second target rotating speed.

[0011] Optionally, combining the first condensing area and the first evaporating area to the second refrigeration circuit comprises: closing a first electrically-operated stop valve and a second electrically-operated stop valve on the first refrigeration circuit, wherein the first electrically-operated stop valve and the second electrically-operated stop valve are arranged on the first refrigeration circuit, the first electrically-operated stop valve is arranged between a suction end of the first compressor and the first evaporating area, and the second electrically-operated stop valve is arranged between a discharge end of the first compressor and the first condensing area; opening a first partition between the first condensing zone and the second condensing zone, and opening a second partition between the first evaporating zone and the second evaporating zone.

[0012] Optionally, after controlling the second compressor based on the third refrigeration circuit, the method further comprises: determining a fault recovery of the first compressor, restarting the first compressor; switching the first condensing zone and the first evaporating zone from the third refrigeration circuit back to the first refrigeration circuit; controlling the first compressor to speed up based on the first refrigeration circuit, and synchronously controlling the second compressor to slow down based on the second refrigeration circuit, until the rotation speeds of the first compressor and the second compressor are the same.

[0013] According to another embodiment of the present application, a control device of a water chiller is provided, comprising: a detection module configured to detect an operating state of a first compressor of a water chiller, wherein the water chiller comprises the first compressor, a second compressor, a condenser, and an evaporator, the condenser comprises a first condensing zone and a second condensing zone, the evaporator comprises a first evaporating zone and a second evaporating zone, the first compressor is connected in a first refrigeration circuit in which the first condensing zone and the first evaporating zone are located, and the second compressor is connected in a second refrigeration circuit in which the second condensing zone and the second evaporating zone are located; a merging module configured to determine that the first compressor is faulty based on the operating state, and merge the first condensing zone and the first evaporating zone to the second refrigeration circuit to obtain a third refrigeration circuit; a first control module configured to control the second compressor based on the third refrigeration circuit.

[0014] Optionally, the first control module comprises: a collection unit configured to collect a first chilled water real-time outlet water temperature of the third refrigeration circuit; a control unit configured to control the second compressor according to the first chilled water real-time outlet water temperature and a chilled water target set value.

[0015] Optionally, the control unit comprises: a judgment subunit configured to judge whether the first chilled water real-time outlet water temperature is less than or equal to the chilled water target set value; a first control subunit configured to control the second compressor to maintain a current rotation speed to continue running if the first chilled water real-time outlet water temperature is less than or equal to the chilled water target set value.

[0016] Optionally, the control unit comprises: determining whether the first chilled water real-time outlet temperature is less than or equal to the chilled water target set value; the second control subunit is configured to, if the first chilled water real-time outlet temperature is greater than the chilled water target set value, control the second compressor to increase the current rotating speed.

[0017] Optionally, the second control subunit is further configured to: control the current rotating speed of the second compressor to increase to a first target rotating speed; continue to collect the second chilled water real-time outlet temperature of the third refrigeration circuit; determine whether the second chilled water real-time outlet temperature is less than or equal to the chilled water target set value; if the second chilled water real-time outlet temperature is less than or equal to the chilled water target set value, control the second compressor to continue to run at the first target rotating speed; if the second chilled water real-time outlet temperature is greater than the chilled water target set value, determine whether the first target rotating speed reaches a predetermined maximum rotating speed; if the first target rotating speed has reached the predetermined maximum rotating speed, control the second compressor to continue to run at the first target rotating speed; if the first target rotating speed has not reached the predetermined maximum rotating speed, control the second compressor to increase from the first target rotating speed to a second target rotating speed.

[0018] Optionally, the merging module comprises: a closing unit configured to close a first electrically-operated stop valve and a second electrically-operated stop valve on the first refrigeration circuit, wherein the first electrically-operated stop valve and the second electrically-operated stop valve are arranged on the first refrigeration circuit, the first electrically-operated stop valve is arranged between a suction end of the first compressor and the first evaporation zone, and the second electrically-operated stop valve is arranged between a discharge end of the first compressor and the first condensation zone; an opening unit configured to open a first partition plate between the first condensation zone and the second condensation zone, and open a second partition plate between the first evaporation zone and the second evaporation zone.

[0019] Optionally, the device further comprises: a first control module configured to, after the first control module controls the second compressor based on the third refrigeration circuit, determine recovery of a fault of the first compressor, and restart the first compressor; a switching module configured to switch the first condensation zone and the first evaporation zone from the third refrigeration circuit back to the first refrigeration circuit; The second control module is configured to control the first compressor to speed up based on the first refrigeration circuit, and simultaneously control the second compressor to slow down based on the second refrigeration circuit, until the rotation speeds of the first compressor and the second compressor are the same.

[0020] According to another embodiment of the present application, a water chiller is provided, comprising a controller, a first compressor, a second compressor, a condenser, and an evaporator, wherein the condenser comprises a first condensing zone and a second condensing zone, the evaporator comprises a first evaporating zone and a second evaporating zone, the first compressor is connected in a first refrigeration circuit in which the first condensing zone and the first evaporating zone are located, the second compressor is connected in a second refrigeration circuit in which the second condensing zone and the second evaporating zone are located, and the controller comprises the control device of the water chiller as described in the above embodiments.

[0021] Optionally, the condenser is provided with a first baffle for switching the closed and communicated states between the first condensing zone and the second condensing zone, and the evaporator is provided with a second baffle for switching the closed and communicated states between the first evaporating zone and the second evaporating zone.

[0022] According to another aspect of the embodiments of the present application, a storage medium is also provided, which comprises a stored program, and the program is configured to execute the steps of the above method when running.

[0023] According to another aspect of the embodiments of the present application, an electronic device is also provided, which comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory can communicate with each other through the communication bus; the memory is configured to store a computer program; and the processor is configured to execute the steps of the above method by running the program stored in the memory.

[0024] According to another aspect of the embodiments of the present application, a storage medium is also provided, which comprises a stored computer program, and the computer program is configured to execute the steps of any of the above device embodiments when running.

[0025] Through the embodiment of the present application, the working state of the first compressor of the water chiller is detected, wherein the water chiller comprises the first compressor, the second compressor, the condenser, and the evaporator, the condenser comprises the first condensing area and the second condensing area, the evaporator comprises the first evaporating area and the second evaporating area, the first compressor is connected in the first refrigeration circuit in which the first condensing area and the first evaporating area are located, and the second compressor is connected in the second refrigeration circuit in which the second condensing area and the second evaporating area are located; the first compressor is determined to be faulty based on the working state, the first condensing area and the first evaporating area are merged into the second refrigeration circuit to obtain the third refrigeration circuit, and the second compressor is controlled based on the third refrigeration circuit, so that the refrigerant and the heat exchange area of the first compressor in the fault state are shared by the second compressor in the normal state, the refrigerating capacity and the refrigerating effect of the second compressor are improved, the cold output is increased for load compensation, the technical problem that the refrigerating capacity is reduced due to the fault of part of the compressors in the multi-system water chiller in the related art is solved, and the stability and the refrigerating efficiency of the water chiller are improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of this application, illustrate the illustrative embodiments of the present application and the description thereof, and do not constitute an improper limitation of the present application. In the drawings: Figure 1 is a hardware structure block diagram of a water chiller according to an embodiment of the present application; Figure 2 is a flow chart of a control method of a water chiller according to an embodiment of the present application; Figure 3 is a pipeline diagram of a water chiller according to an embodiment of the present application; Figure 4 is a structure schematic diagram of a partition plate according to an embodiment of the present application; Figure 5 is a flow chart of load compensation of a multi-system water chiller according to an embodiment of the present application; Figure 6 is a structure block diagram of a control device of a water chiller according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should fall within the scope of protection of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0028] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0029] Embodiment 1 The method embodiments provided by the embodiment one of the present application can be executed in a refrigerator, a freezer, a water chiller, a cold storage, a controller or the like. Taking the water chiller as an example, Figure 1 is a hardware structure block diagram of a water chiller according to an embodiment of the present application. As shown in Figure 1 , the water chiller can include one or more (only one is shown in Figure 1 ) processor 102 (the processor 102 can include but not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. Optionally, the above-mentioned water chiller can also include a transmission device 106 for communication function and an input and output device 108. Those skilled in the art can understand that Figure 1 The structure shown is only schematic, which does not limit the structure of the above-mentioned water chiller. For example, the water chiller can also include more or less components than Figure 1 shown, or have a different configuration from Figure 1 shown.

[0030] The memory 104 can be used to store chiller unit programs, such as application software programs and modules, like the chiller unit program corresponding to a chiller unit control method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the chiller unit program stored in the memory 104, thereby implementing the aforementioned method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the chiller unit via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0031] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the chiller unit's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0032] This embodiment provides a control method for a chiller unit. Figure 2 This is a flowchart of a control method for a chiller unit according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S202: Detect the operating status of the first compressor of the chiller unit. The chiller unit includes a first compressor, a second compressor, a condenser, and an evaporator. The condenser includes a first condensing zone and a second condensing zone. The evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in a first refrigeration circuit where the first condensing zone and the first evaporating zone are located. The second compressor is connected in a second refrigeration circuit where the second condensing zone and the second evaporating zone are located. The chiller unit in this embodiment can be a refrigeration unit, chiller unit, ice water unit, cooling equipment, etc., or it can be an air-cooled chiller unit or a water-cooled chiller unit. Depending on the type of compressor, it can be a screw chiller unit, a scroll chiller unit, a centrifugal chiller unit, etc.

[0033] Figure 3This is a piping diagram of a chiller unit in an embodiment of the present invention. The dual-system chiller unit includes compressor 1 (first compressor), compressor 2 (second compressor), condenser, evaporator, two baffles (first baffle in the condenser and second baffle in the evaporator), electric shut-off valve 1 (first electric shut-off valve), electric shut-off valve 2 (second electric shut-off valve), electric shut-off valve 3 (third electric shut-off valve), electric shut-off valve 4 (fourth electric shut-off valve), dryer filter, electronic expansion valve, shut-off valve, etc. Electric shut-off valves are installed on the suction and discharge pipes of the two compressors. A baffle is installed between the evaporator and the condenser. The baffle can operate in two modes: fully closed or fully open, according to signal feedback.

[0034] This embodiment of the multi-system chiller unit combines the advantages of independent and non-independent multi-system systems, adopting the advantages of both while eliminating their disadvantages. It ensures that each system maintains independent balance during normal operation, while allowing other compressors to increase cooling output for load compensation when one compressor fails. When two compressors are operating normally, electric shut-off valves 1-4 are open, and the evaporator and condenser baffles are fully closed. The first compressor uses the first refrigeration circuit for load control, and the second compressor uses the second refrigeration circuit. When one compressor fails, the corresponding electric shut-off valve closes, the evaporator and condenser baffles are fully open, and the other operating compressor initiates load compensation control.

[0035] Step S204: Based on the operating status, it is determined that the first compressor has failed, and the first condensing zone and the first evaporating zone are merged into the second refrigeration circuit to obtain the third refrigeration circuit; based on Figure 3 When both partitions are fully open, the first condensing zone and the second condensing zone merge, the first evaporating zone and the second evaporating zone merge, and the first refrigeration circuit and the second refrigeration circuit merge into the third refrigeration circuit.

[0036] Step S206: Control the second compressor based on the third refrigeration circuit.

[0037] Through the above steps, the operating status of the first compressor of the chiller unit is detected. The chiller unit includes a first compressor, a second compressor, a condenser, and an evaporator. The condenser includes a first condensing zone and a second condensing zone, and the evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in a first refrigeration circuit containing the first condensing zone and the first evaporating zone, and the second compressor is connected in a second refrigeration circuit containing the second condensing zone and the second evaporating zone. Based on the operating status, it is determined that the first compressor has failed. The first condensing zone and the first evaporating zone are merged into the second refrigeration circuit to obtain a third refrigeration circuit. The second compressor is controlled based on the third refrigeration circuit. By merging the first refrigeration circuit of the faulty first compressor into the second refrigeration circuit of the normal second compressor, the second compressor can share the refrigerant and heat exchange area of ​​the first compressor, improving the cooling capacity and cooling effect of the second compressor. This increases the cooling output for load compensation, solving the technical problem of reduced cooling capacity due to partial compressor failure in multi-system chiller units in related technologies, and improving the stability and cooling efficiency of the chiller unit.

[0038] In one embodiment of this example, controlling the second compressor based on the third refrigeration circuit includes: acquiring the real-time outlet temperature of the first chilled water in the third refrigeration circuit; and controlling the second compressor according to the real-time outlet temperature of the first chilled water and the target set value of the chilled water.

[0039] After the first compressor fails, the second compressor maintains a constant speed and uses a temperature sensor to detect the real-time outlet temperature Tc of the chilled water in the third refrigeration circuit. This temperature is then compared with the target setpoint T±ΔT (taking the target setpoint of chilled water as T+ΔT as an example) to determine whether the current load requirements of the air conditioning system are met, and further control the cooling power of the second compressor.

[0040] In this embodiment, after the first compressor fails, the chilled water outlet temperature of the merged third refrigeration circuit is used to control the second compressor. The second compressor can sense the load status of the original first compressor's refrigeration area, thus improving the overall cooling effect of the chiller unit.

[0041] In one control scenario, controlling the second compressor based on the real-time outlet temperature of the first chilled water and the target setpoint of the chilled water includes: determining whether the real-time outlet temperature of the first chilled water is less than or equal to the target setpoint of the chilled water; if the real-time outlet temperature of the first chilled water is less than or equal to the target setpoint of the chilled water, controlling the second compressor to maintain the current speed and continue to operate.

[0042] If Tc ≤ T + ΔT, after the first compressor fails, the current water temperature can still meet the air conditioning load requirements. The second compressor operates at its original speed without adjustment, suitable for scenarios with low air conditioning system loads. Even with the second compressor speed unchanged, if the second compressor's refrigeration circuit changes from the second to the third refrigeration circuit, the refrigerant flow increases, leading to an increase in the second compressor's cooling capacity. The basic formula for calculating cooling capacity (Q) is Q = m × q, where m is the refrigerant mass flow rate and q is the cooling capacity per unit mass. Cooling capacity is directly proportional to the refrigerant mass flow rate; therefore, the cooling capacity of the second compressor will also increase. When the overall load of the air conditioning system is low, the increase in cooling capacity due to the increased refrigerant flow rate can fully compensate for the cooling capacity of the first compressor.

[0043] In this embodiment, after the first compressor fails, the second compressor can meet the load requirements of the air conditioning system based on the refrigerant and heat exchange area of ​​the merged third refrigeration circuit. Therefore, there is no need to adjust the second compressor, which improves the operational stability of the second compressor and avoids energy efficiency fluctuations of the chiller unit when the compressor fails.

[0044] In one control scenario, controlling the second compressor based on the real-time outlet temperature of the first chilled water and the target set value of the chilled water includes: determining whether the real-time outlet temperature of the first chilled water is less than or equal to the target set value of the chilled water; if the real-time outlet temperature of the first chilled water is greater than the target set value of the chilled water, controlling the second compressor to increase its current speed.

[0045] If Tc>T+ΔT, meaning that after compressor 1 fails, the real-time outlet temperature of chilled water is too high. Since the reduction in cooling capacity caused by the failure of the first compressor has affected the cooling effect of the air conditioner, it is necessary to increase the speed of the second compressor. As the speed increases, the refrigerant flows faster in the third refrigeration circuit, and the compression and condensation processes are more efficient, thereby improving the cooling capacity and enhancing the cooling effect of the refrigerant in the third refrigeration circuit.

[0046] In this embodiment, after the first compressor fails, the second compressor, based on the fact that the refrigerant and heat exchange area of ​​the merged third refrigeration circuit cannot meet the load requirements of the air conditioning system, increases the current speed of the second compressor to improve the cooling effect of the third refrigeration circuit, thus ensuring the cooling effect of the air conditioning system and avoiding fluctuations in the cooling effect of the chiller unit when the compressor fails.

[0047] In one example, controlling the second compressor to increase its current speed includes: controlling the current speed of the second compressor to increase to a first target speed; continuing to collect the real-time outlet temperature of the second chilled water in the third refrigeration circuit; determining whether the real-time outlet temperature of the second chilled water is less than or equal to the target set value of the chilled water; if the real-time outlet temperature of the second chilled water is less than or equal to the target set value of the chilled water, controlling the second compressor to maintain the first target speed and continue operating; if the real-time outlet temperature of the second chilled water is greater than the target set value of the chilled water, determining whether the first target speed has reached a predetermined maximum speed; if the first target speed has reached the predetermined maximum speed, controlling the second compressor to maintain the first target speed and continue operating; if the first target speed has not reached the predetermined maximum speed, controlling the second compressor to increase from the first target speed to a second target speed.

[0048] The compressor's current speed is increased by a preset step size, and the real-time chilled water outlet temperature (second chilled water outlet temperature) is re-detected and compared with Tc and T+ΔT. When the second compressor reaches a certain target speed N (N < compressor's allowed maximum speed Nmax), Tc ≤ T+ΔT, the increase in compressor 2 speed is stopped. If Tc ≤ T+ΔT is not true, the compressor's current speed is increased by a preset step size until the speed N reaches the compressor's allowed maximum speed Nmax. When compressor 2's speed N reaches the compressor's allowed maximum speed Nmax, Tc and T+ΔT are no longer judged, the cooling capacity of compressor 2 has reached its maximum value, and the increase in compressor 2 speed is stopped.

[0049] After compressor 1 fails, only compressor 2 operates, causing a sudden decrease in the chiller's cooling capacity and a sudden rise in the chilled water outlet temperature Tc. Subsequently, compressor 2's speed increases from its current speed, while continuing to collect and judge the chilled water outlet temperature Tc and the target setpoint T+ΔT. The following two scenarios may occur: Scenario 1: When compressor 2 reaches a certain speed N (N < the compressor's maximum allowable speed Nmax), Tc ≤ T + ΔT, the speed of compressor 2 is no longer increased. Since the speed of compressor 2 has not yet reached its upper limit, and the chilled water outlet temperature has already reached the target set value, the speed of compressor 2 is no longer increased, thus completing 100% cooling capacity compensation. Even if compressor 1 fails and shuts down, because the entire unit has compensated for the refrigerant and heat exchange area of ​​compressor 2, operating only compressor 2 can meet the cooling load requirements of the air conditioning system.

[0050] Scenario 2: When the compressor 2's speed N reaches the compressor's predetermined maximum speed Nmax, no further judgment is made on Tc and T+ΔT, and the compressor 2 speed is stopped from increasing. In this case, the cooling capacity of compressor 2 has reached its maximum value. Since the compressor 2's speed has already reached its maximum value, even if the chilled water outlet temperature has not yet reached the target set value, there is no need to make further judgments, because the compressor cannot be increased further. At this time, the cooling capacity compensation is less than 100%. If compressor 1 fails and shuts down, the entire chiller unit can only meet half of the air conditioning system's cooling load demand. However, due to refrigerant and heat exchange area compensation, coupled with compressor 2 operating at its predetermined maximum speed, it can still meet the air conditioning system's cooling load demand to a certain extent, minimizing the cooling load shortfall.

[0051] By adopting the solution of this embodiment, the speed of the second compressor is increased to meet the cooling demand or the predetermined maximum speed. While ensuring the safe operation of the second compressor, the cooling capacity of the first compressor is maximized, thus taking into account both the cooling effect and stability of the chiller unit.

[0052] In one embodiment of this example, merging the first condensing zone and the first evaporating zone into the second refrigeration circuit includes: closing the first electrically operated shut-off valve and the second electrically operated shut-off valve on the first refrigeration circuit, wherein the first refrigeration circuit is provided with the first electrically operated shut-off valve and the second electrically operated shut-off valve, the first electrically operated shut-off valve is installed between the suction end of the first compressor and the first evaporating zone, and the second electrically operated shut-off valve is installed between the discharge end of the first compressor and the first condensing zone; opening the first partition between the first condensing zone and the second condensing zone, and opening the second partition between the first evaporating zone and the second evaporating zone.

[0053] In this embodiment, closing the electric shut-off valve 1 and electric shut-off valve 2 on the first refrigeration circuit can prevent the refrigerant from continuing to flow through the first compressor. This facilitates the disassembly and maintenance of the compressor 1, and also allows as much of the refrigerant in the first refrigeration circuit as possible to be introduced into the second refrigeration circuit, avoiding refrigerant waste and increasing the total refrigerant flow rate of the third refrigeration circuit.

[0054] Optionally, the first and second partitions are louvered partitions, specifically louvered fans. Figure 4 This is a schematic diagram of the partition structure in an embodiment of the present invention, illustrating two states of the partition when it is fully closed and fully open, corresponding to the control states when all compressors of the chiller unit are operating normally and when one compressor fails.

[0055] By adopting the solution of this embodiment, the refrigerant can be prevented from continuing to flow through the first compressor by closing the electric shut-off valve on the first refrigeration circuit, which facilitates the disassembly and maintenance of the first compressor and increases the refrigerant flow rate in the third refrigeration circuit.

[0056] In one implementation scenario of this embodiment, after controlling the second compressor based on the third refrigeration circuit, the method further includes: determining that the fault recovery of the first compressor has been completed and restarting the first compressor; switching the first condensing zone and the first evaporating zone from the third refrigeration circuit back to the first refrigeration circuit; controlling the first compressor to speed up based on the first refrigeration circuit and simultaneously controlling the second compressor to speed down based on the second refrigeration circuit until the speeds of the first compressor and the second compressor are the same.

[0057] After the compressor 1 fault is recovered, the compressor is restarted, and the evaporator and condenser baffles return to the fully enclosed mode. The first condensing zone and the first evaporating zone of the original first refrigeration circuit switch back to the first refrigeration circuit from the current third refrigeration circuit. The two compressors form an independent dual-system structure and operate normally. The compressor 1 gradually increases its speed and the compressor 2 decreases its speed synchronously until the two compressors run at the same speed, and the entire chiller unit returns to normal.

[0058] The solution in this embodiment restarts the first compressor and switches back to the independent dual-system refrigeration circuit after the first compressor fails and recovers, which improves the fault recovery capability of the chiller unit and reduces manual maintenance and debugging costs.

[0059] This embodiment proposes a load compensation and intelligent control method for multi-system chillers. Compared with conventional multi-system chillers, the evaporator and condenser baffles adopt a louvered fan mode, which can operate in two modes, "fully enclosed" or "fully open", according to the actual situation of the unit. At the same time, the compressor speed and cooling output are adjusted according to the signal feedback, so as to realize the operation mode of real-time load compensation of the other compressors when one compressor fails.

[0060] Figure 5 This is a flowchart of load compensation for a multi-system chiller unit in an embodiment of the present invention. A first compressor and a first refrigeration circuit constitute system 1, and a second compressor and a second refrigeration circuit constitute system 2, including: Step 1: A fault was detected in compressor 1, causing it to stop. This information was then sent to the control center. Step 2: Close electric shut-off valve 1 and electric shut-off valve 2 to facilitate the disassembly and maintenance of compressor 1; Step 3: The evaporator and condenser baffles are fully open. At this time, system 2 shares the refrigerant and heat exchange area of ​​system 1, which can improve the cooling capacity and cooling effect of compressor 2 to a certain extent. Step 4: With compressor 2 operating at constant speed, monitor the real-time chilled water outlet temperature Tc and compare it with the target setpoint T±ΔT: 1) If Tc≤T+ΔT, that is, after compressor 1 fails, the current water temperature can still meet the air conditioning load requirements, and compressor 2 runs at the original speed; 2) Tc>T+ΔT, that is, after compressor 1 fails, the chilled water outlet temperature is too high. At this time, the speed of compressor 2 is gradually increased, and Tc and T+ΔT are monitored and compared in real time: when compressor 2 reaches a certain speed N (N< compressor's allowed maximum speed Nmax), Tc≤T+ΔT, the speed of compressor 2 is stopped from increasing; when the speed N of compressor 2 reaches the compressor's allowed maximum speed Nmax, the speed of compressor 2 is stopped from increasing. In this case, the cooling capacity of compressor 2 has reached the maximum value.

[0061] The solution in this embodiment can ensure that the chiller unit can maintain the independent balance of each system during normal operation, and when a compressor fails and stops, it can ensure that other compressors increase their cooling output to compensate for the load.

[0062] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, refrigerator, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0063] Example 2 This embodiment also provides a control device for a chiller unit and a chiller unit, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. The term "module" as used below refers to a combination of software and hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also conceivable.

[0064] Figure 6 This is a structural block diagram of a control device for a chiller unit according to an embodiment of the present invention, as shown below. Figure 6 As shown, it includes: The detection module 60 is used to detect the working status of the first compressor of the chiller unit. The chiller unit includes the first compressor, the second compressor, the condenser, and the evaporator. The condenser includes a first condensing zone and a second condensing zone. The evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in a first refrigeration circuit where the first condensing zone and the first evaporating zone are located. The second compressor is connected in a second refrigeration circuit where the second condensing zone and the second evaporating zone are located. The merging module 62 is used to determine that the first compressor has failed based on the working state, and merge the first condensing zone and the first evaporating zone into the second refrigeration circuit to obtain a third refrigeration circuit; The first control module 64 is used to control the second compressor based on the third refrigeration circuit.

[0065] Optionally, the first control module includes: The data acquisition unit is used to acquire the real-time outlet temperature of the first chilled water in the third refrigeration circuit. The control unit is used to control the second compressor based on the real-time outlet temperature of the first chilled water and the target set value of the chilled water.

[0066] Optionally, the control unit includes: The judgment subunit is used to determine whether the real-time outlet temperature of the first chilled water is less than or equal to the target set value of the chilled water. The first control subunit is used to control the second compressor to maintain its current speed and continue running if the real-time outlet temperature of the first chilled water is less than or equal to the target set value of the chilled water.

[0067] Optionally, the control unit includes: The judgment subunit is used to determine whether the real-time outlet temperature of the first chilled water is less than or equal to the target set value of the chilled water. The second control subunit is used to control the second compressor to increase its current speed if the real-time outlet temperature of the first chilled water is greater than the target set value of the chilled water.

[0068] Optionally, the second control subunit is further configured to: Control the current speed of the second compressor to increase to the first target speed; Continue to collect the real-time outlet temperature of the second chilled water in the third refrigeration circuit; Determine whether the real-time outlet temperature of the second chilled water is less than or equal to the target set value of the chilled water; If the real-time outlet temperature of the second chilled water is less than or equal to the target set value of the chilled water, the second compressor is controlled to maintain the first target speed and continue to run; if the real-time outlet temperature of the second chilled water is greater than the target set value of the chilled water, it is determined whether the first target speed has reached the predetermined maximum speed. If the first target speed has reached the predetermined maximum speed, control the second compressor to maintain the first target speed and continue to operate; if the first target speed has not reached the predetermined maximum speed, control the second compressor to increase from the first target speed to the second target speed.

[0069] Optionally, the merging module includes: The shut-off unit is used to shut off the first electric shut-off valve and the second electric shut-off valve on the first refrigeration circuit. The first refrigeration circuit is provided with the first electric shut-off valve and the second electric shut-off valve. The first electric shut-off valve is installed between the suction end of the first compressor and the first evaporation zone, and the second electric shut-off valve is installed between the discharge end of the first compressor and the first condensation zone. An opening unit is used to open the first partition between the first condensing zone and the second condensing zone, and to open the second partition between the first evaporating zone and the second evaporating zone.

[0070] Optionally, the device further includes: The first control module is used to determine the fault recovery of the first compressor and restart the first compressor after the first control module controls the second compressor based on the third refrigeration circuit; A switching module is used to switch the first condensing zone and the first evaporating zone from the third refrigeration circuit back to the first refrigeration circuit; The second control module is used to control the speed of the first compressor to increase based on the first refrigeration circuit, and simultaneously control the speed of the second compressor to decrease based on the second refrigeration circuit, until the speeds of the first compressor and the second compressor are the same.

[0071] This embodiment also provides a chiller unit, including: a controller, a first compressor, a second compressor, a condenser, and an evaporator. The condenser includes a first condensing zone and a second condensing zone, and the evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in a first refrigeration circuit where the first condensing zone and the first evaporating zone are located, and the second compressor is connected in a second refrigeration circuit where the second condensing zone and the second evaporating zone are located. The controller includes the control device for the chiller unit described in the above embodiment.

[0072] Optionally, the condenser is provided with a first louvered baffle for switching between the closed and open states of the first condensing zone and the second condensing zone, and the evaporator is provided with a second louvered baffle for switching between the closed and open states of the first evaporating zone and the second evaporating zone.

[0073] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0074] Example 3 Embodiments of the present invention also provide a storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

[0075] Optionally, in this embodiment, the storage medium can be configured to store a computer program for execution: S1, detect the working status of the first compressor of the chiller unit, wherein the chiller unit includes the first compressor, the second compressor, the condenser, and the evaporator. The condenser includes a first condensing zone and a second condensing zone. The evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in the first refrigeration circuit where the first condensing zone and the first evaporating zone are located. The second compressor is connected in the second refrigeration circuit where the second condensing zone and the second evaporating zone are located. S2, based on the working state, it is determined that the first compressor has failed, and the first condensing zone and the first evaporating zone are merged into the second refrigeration circuit to obtain the third refrigeration circuit; S3, control the second compressor based on the third refrigeration circuit.

[0076] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0077] Embodiments of the present invention also provide an electronic device including a memory and a processor, the memory storing a computer program and the processor being configured to run the computer program to perform the steps in any of the above method embodiments.

[0078] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor and the input / output device is connected to the processor.

[0079] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program: S1, detect the working status of the first compressor of the chiller unit, wherein the chiller unit includes the first compressor, the second compressor, the condenser, and the evaporator. The condenser includes a first condensing zone and a second condensing zone. The evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in the first refrigeration circuit where the first condensing zone and the first evaporating zone are located. The second compressor is connected in the second refrigeration circuit where the second condensing zone and the second evaporating zone are located. S2, based on the working state, it is determined that the first compressor has failed, and the first condensing zone and the first evaporating zone are merged into the second refrigeration circuit to obtain the third refrigeration circuit; S3, control the second compressor based on the third refrigeration circuit.

[0080] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0081] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0082] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of units or modules may be electrical or other forms.

[0084] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0085] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0086] 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, controller, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0087] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A control method for a chiller unit, characterized in that, include: The working status of the first compressor of the chiller unit is detected. The chiller unit includes a first compressor, a second compressor, a condenser, and an evaporator. The condenser includes a first condensing zone and a second condensing zone. The evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in a first refrigeration circuit where the first condensing zone and the first evaporating zone are located. The second compressor is connected in a second refrigeration circuit where the second condensing zone and the second evaporating zone are located. Based on the operating status, it is determined that the first compressor has failed. The first condensation zone and the first evaporation zone are merged into the second refrigeration circuit to obtain the third refrigeration circuit. The second compressor is controlled based on the third refrigeration circuit.

2. The method according to claim 1, characterized in that, Controlling the second compressor based on the third refrigeration circuit includes: Collect the real-time outlet temperature of the first chilled water in the third refrigeration circuit; The second compressor is controlled based on the real-time outlet temperature of the first chilled water and the target set value of the chilled water.

3. The method according to claim 2, characterized in that, Controlling the second compressor based on the real-time outlet temperature of the first chilled water and the target setpoint of the chilled water includes: Determine whether the real-time outlet temperature of the first chilled water is less than or equal to the target set value of the chilled water; If the real-time outlet temperature of the first chilled water is less than or equal to the target set value of the chilled water, then the second compressor is controlled to maintain the current speed and continue to run.

4. The method according to claim 2, characterized in that, Controlling the second compressor based on the real-time outlet temperature of the first chilled water and the target setpoint of the chilled water includes: Determine whether the real-time outlet temperature of the first chilled water is less than or equal to the target set value of the chilled water; If the real-time outlet temperature of the first chilled water is greater than the target set value of the chilled water, the second compressor is controlled to increase its current speed.

5. The method according to claim 4, characterized in that, Controlling the second compressor to increase its current speed includes: Control the current speed of the second compressor to increase to the first target speed; Continue to collect the real-time outlet temperature of the second chilled water in the third refrigeration circuit; Determine whether the real-time outlet temperature of the second chilled water is less than or equal to the target set value of the chilled water; If the real-time outlet temperature of the second chilled water is less than or equal to the target set value of the chilled water, the second compressor is controlled to maintain the first target speed and continue to run; if the real-time outlet temperature of the second chilled water is greater than the target set value of the chilled water, it is determined whether the first target speed has reached the predetermined maximum speed. If the first target speed has reached the predetermined maximum speed, control the second compressor to maintain the first target speed and continue to operate; if the first target speed has not reached the predetermined maximum speed, control the second compressor to increase from the first target speed to the second target speed.

6. The method according to claim 1, characterized in that, Combining the first condensation zone and the first evaporation zone into the second refrigeration circuit includes: The first electric shut-off valve and the second electric shut-off valve on the first refrigeration circuit are closed. The first refrigeration circuit is provided with the first electric shut-off valve and the second electric shut-off valve. The first electric shut-off valve is installed between the suction end of the first compressor and the first evaporation zone, and the second electric shut-off valve is installed between the discharge end of the first compressor and the first condensation zone. Open the first partition between the first condensation zone and the second condensation zone, and open the second partition between the first evaporation zone and the second evaporation zone.

7. The method according to claim 1, characterized in that, After controlling the second compressor based on the third refrigeration circuit, the method further includes: Once the fault in the first compressor is confirmed to be resolved, the first compressor is restarted. Switch the first condensation zone and the first evaporation zone back from the third refrigeration circuit to the first refrigeration circuit; The first compressor is accelerated based on the first refrigeration circuit, and the second compressor is decelerated based on the second refrigeration circuit until the speeds of the first compressor and the second compressor are the same.

8. A control device for a chiller unit, characterized in that, include: The detection module is used to detect the operating status of the first compressor of the chiller unit. The chiller unit includes the first compressor, the second compressor, the condenser, and the evaporator. The condenser includes a first condensing zone and a second condensing zone. The evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in a first refrigeration circuit where the first condensing zone and the first evaporating zone are located. The second compressor is connected in a second refrigeration circuit where the second condensing zone and the second evaporating zone are located. The merging module is used to determine that the first compressor has failed based on the operating status, and to merge the first condensing zone and the first evaporating zone into the second refrigeration circuit to obtain a third refrigeration circuit. The first control module is used to control the second compressor based on the third refrigeration circuit.

9. A water chiller unit, characterized in that, include: The system includes a controller, a first compressor, a second compressor, a condenser, and an evaporator. The condenser includes a first condensing zone and a second condensing zone. The evaporator includes a first evaporating zone and a second evaporating zone. The first compressor is connected in a first refrigeration circuit containing the first condensing zone and the first evaporating zone. The second compressor is connected in a second refrigeration circuit containing the second condensing zone and the second evaporating zone. The controller includes the control device for the chiller unit as described in claim 8.

10. The chiller unit according to claim 9, characterized in that, The condenser is provided with a first louvered baffle for switching between the closed and open states of the first condensing zone and the second condensing zone, and the evaporator is provided with a second louvered baffle for switching between the closed and open states of the first evaporating zone and the second evaporating zone.

11. A storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the steps of the control method for the chiller unit according to any one of claims 1 to 7 when it is run.

12. An electronic device comprising a processor, a communication interface, a memory, and a communication bus, wherein, The processor, communication interface, and memory communicate with each other via a communication bus; among which: Memory, used to store computer programs; A processor is configured to execute the steps of the control method for the chiller unit according to any one of claims 1 to 7 by running a program stored in memory.

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