A refrigeration system control method, device and refrigeration system

Abstract

The present invention discloses a control method, device and system for a refrigeration system. The refrigeration system includes at least one refrigeration machine, and the method includes: during the operation of the refrigeration system, monitoring the actual medium temperature output by the currently operating refrigeration machine; if the actual medium temperature is not within the preset range required by the terminal device, controlling the medium output by the currently operating refrigeration machine to directly return to the refrigeration machine through the return liquid pipeline without supplying the terminal device; and then when the actual medium temperature is within the preset range, controlling the medium output by the currently operating refrigeration machine to supply the terminal device. The present invention can ensure that the temperature of the medium supplied to the terminal device is relatively stable without excessive fluctuations, meet the process control requirements of the terminal device, and ensure the stable operation of the refrigeration system.

Description

Technical Field

[0001] The present invention relates to the technical field of units, and in particular to a refrigeration system control method, device and refrigeration system. Background Art

[0002] The chiller system outputs medium (such as chilled water, etc.) to the terminal equipment so that the terminal equipment can obtain the required temperature. In the field of process air conditioning, there are very strict temperature fluctuation limits, especially for factories with ultra-low temperature chilled water outlet, which is very difficult to control. On the one hand, since the chiller outlet water temperature is close to 0℃, there is a risk of shell and tube freezing. On the other hand, unstable control can easily result in the chilled water supply temperature not meeting the process requirements.

[0003] With regard to the problem of excessive fluctuation in the temperature of the medium at the supply end of the intercooler system in the prior art, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present invention provide a chiller system control method, device and chiller system, so as to at least solve the problem of excessive fluctuation of the medium temperature at the supply end of the chiller system in the prior art.

[0005] To solve the above technical problems, an embodiment of the present invention provides a refrigeration system control method, wherein the refrigeration system includes at least one refrigeration machine, and the method includes: during the operation of the refrigeration system, monitoring the actual medium temperature output by the currently running refrigeration machine; if the actual medium temperature is not within the preset range required by the terminal device, controlling the medium output by the currently running refrigeration machine to directly return to the refrigeration machine through the return liquid pipeline, and not supplying the terminal device; thereafter, when the actual medium temperature is within the preset range required by the terminal device, controlling the medium output by the currently running refrigeration machine to be supplied to the terminal device.

[0006] Optionally, before monitoring the actual medium temperature output by the currently running chiller, it also includes: receiving a chiller system start-up signal; turning on a preset number of chillers, controlling the preset number of chillers to operate at a preset temperature, and controlling the medium output by the preset number of chillers to directly return to the chiller through the return liquid pipeline without supplying it to the terminal device, wherein the preset temperature is higher than the medium temperature setting value of the terminal device; when the actual medium temperature output by the preset number of chillers is stabilized at the preset temperature, controlling the preset number of chillers to operate at the medium temperature setting value of the terminal device, and controlling the medium output by the preset number of chillers to be supplied to the terminal device.

[0007] Optionally, a first water pump is provided at the inlet of each of the chillers, and the method further includes: during the operation of the chiller system, monitoring the actual load rate of the currently operating chiller; if the actual load rate reaches a first preset load value, prohibiting the frequency increase of the first water pump corresponding to the currently operating chiller; if the actual load rate reaches a second preset load value, prohibiting the frequency reduction of the first water pump corresponding to the currently operating chiller; wherein the first preset load value is greater than the second preset load value.

[0008] Optionally, after monitoring the actual load rate of the currently running refrigerator, the method further includes: if the actual load rate reaches the first preset load value and lasts for a preset time, adding another refrigerator to start.

[0009] Optionally, after monitoring the actual load rate of the currently running refrigerator, the method further includes: if the actual load rate reaches the second preset load value and lasts for a preset time, shutting down a refrigerator.

[0010] Optionally, shutting down a chiller includes: determining the number of chillers currently in operation; if only one chiller is currently turned on and the terminal device has no load demand, shutting down the chiller; if only one chiller is currently turned on and the terminal device still has a load demand, controlling the chiller to maintain the current operating state.

[0011] Optionally, the inlet of each refrigerator is connected to the outlet of the terminal device through the return liquid pipeline; the outlet of each refrigerator can be connected to the return liquid pipeline in an on-off manner; the outlet of each refrigerator can be connected to the inlet of the terminal device in an on-off manner.

[0012] Optionally, a first valve is provided on the connecting pipeline between the outlet of each refrigerator and the return liquid pipeline, and a second valve is provided on the connecting pipeline between the outlet of each refrigerator and the inlet of the terminal device; the medium output by the currently running refrigerator is controlled to return to the refrigerator directly through the return liquid pipeline without being supplied to the terminal device, including: controlling the first valve corresponding to the currently running refrigerator to open, and controlling the second valve corresponding to the currently running refrigerator to close; controlling the medium output by the currently running refrigerator to be supplied to the terminal device, including: controlling the first valve corresponding to the currently running refrigerator to close, and controlling the second valve corresponding to the currently running refrigerator to open.

[0013] Optionally, the refrigeration system also includes: a first liquid storage tank, the first liquid storage tank includes a first inlet, a second inlet and an outlet, the first liquid storage tank is connected to the return liquid pipeline through the first inlet and its own outlet, and the outlet of each of the refrigeration machines can be connected to the second inlet in an on-off manner to achieve connection with the return liquid pipeline.

[0014] Optionally, the refrigeration system further includes: a second liquid storage tank, the inlet of the second liquid storage tank being connectable and disconnectable to the outlet of each of the refrigeration machines, and the outlet of the second liquid storage tank being connected to the inlet of the terminal device.

[0015] Optionally, the refrigeration system further includes: a second water pump, located between the outlet of the second liquid storage tank and the inlet of the terminal device.

[0016] An embodiment of the present invention also provides a refrigeration system, comprising: at least one refrigeration machine; the inlet of each refrigeration machine is connected to the outlet of a terminal device via a liquid return pipeline; the outlet of each refrigeration machine can be connected to the liquid return pipeline in an on-off manner; the outlet of each refrigeration machine can be connected to the inlet of the terminal device in an on-off manner.

[0017] Optionally, a first valve is provided on the connecting pipeline between the outlet of each refrigerator and the liquid return pipeline, and a second valve is provided on the connecting pipeline between the outlet of each refrigerator and the inlet of the terminal device.

[0018] Optionally, the refrigeration system also includes: a first liquid storage tank, the first liquid storage tank includes a first inlet, a second inlet and an outlet, the first liquid storage tank is connected to the return liquid pipeline through the first inlet and its own outlet, and the outlet of each of the refrigeration machines can be connected to the second inlet in an on-off manner to achieve connection with the return liquid pipeline.

[0019] Optionally, the refrigeration system further includes: a second liquid storage tank, the inlet of the second liquid storage tank being connectable and disconnectable to the outlet of each of the refrigeration machines, and the outlet of the second liquid storage tank being connected to the inlet of the terminal device.

[0020] Optionally, the refrigeration system further includes: a water pump, located between the outlet of the second liquid storage tank and the inlet of the terminal device.

[0021] An embodiment of the present invention also provides a refrigeration system control device, wherein the refrigeration system includes at least one refrigeration machine, and the device includes: a first monitoring module, used to monitor the actual medium temperature output by the currently running refrigeration machine during the operation of the refrigeration system; a first control module, used to control the medium output by the currently running refrigeration machine to directly return to the refrigeration machine through a return liquid pipeline without supplying the terminal device if the actual medium temperature is not within the preset range required by the terminal device; a second control module, used to control the medium output by the currently running refrigeration machine to be supplied to the terminal device when the actual medium temperature is within the preset range required by the terminal device.

[0022] An embodiment of the present invention further provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the embodiment of the present invention when executing the computer program.

[0023] The embodiment of the present invention further provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the embodiment of the present invention are implemented.

[0024] By applying the technical solution of the present invention, during the operation of the chiller system, the actual medium temperature output by the currently running chiller is monitored; if the actual medium temperature is not within the preset range required by the terminal device, the medium output by the currently running chiller is controlled to directly return to the chiller through the return liquid pipeline, and is not supplied to the terminal device; thereafter, when the actual medium temperature is within the preset range required by the terminal device, the medium output by the currently running chiller is controlled to be supplied to the terminal device. By bypassing the chiller output, when the actual medium temperature output by the chiller is within the preset range required by the terminal device, the medium is delivered to the terminal device, which can ensure that the medium temperature supplied to the terminal device is relatively stable without excessive fluctuations, meet the process control requirements of the terminal device, and ensure the stable operation of the chiller system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a cooling system provided by Embodiment 1 of the present invention Figure 1 ;

[0026] Figure 2 Schematic diagram of a cooling system provided by Embodiment 1 of the present invention Figure 2 ;

[0027] Figure 3 Schematic diagram of a cooling system provided by Embodiment 1 of the present invention Figure 3 ;

[0028] Figure 4 is a flow chart of a chiller system control method provided in Embodiment 2 of the present invention;

[0029] Figure 5 is a structural block diagram of a chiller system control device provided in Embodiment 3 of the present invention;

[0030] Description of reference numerals:

[0031] Chiller 10 , liquid return pipeline 20 , terminal device 30 , first valve 40 , second valve 50 , first water pump 60 , first liquid storage tank 70 , first inlet 71 , second inlet 72 , outlet 73 , second liquid storage tank 80 , second water pump 90 . DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0035] Embodiment 1

[0036] The present embodiment provides a refrigeration system, which can ensure that the temperature of the medium supplied to the terminal device is relatively stable without excessive fluctuations, and meet the process control requirements of the terminal device. The refrigeration system includes: at least one refrigeration machine 10. If the number of refrigeration machines in the refrigeration system is two or more, these refrigeration machines 10 are connected in parallel. The medium supplied to the terminal device by the refrigeration system can be water, etc. The rated cooling capacity of each refrigeration machine 10 in the same refrigeration system can be configured to be the same or different.

[0037] like Figure 1 As shown, the inlet of each chiller 10 is connected to the outlet of the terminal device 30 through the liquid return pipeline 20. The outlet of each chiller 10 can be connected to the liquid return pipeline 20 in an on-off manner. The outlet of each chiller 10 can be connected to the inlet of the terminal device 30 in an on-off manner. The liquid return pipeline 20 refers to the common pipeline through which the medium returns from the terminal device 30 to each chiller 10, such as Figure 1 The AB section of the pipeline.

[0038] The chiller system of this embodiment includes two medium circulation loops: a self-circulation loop (bypass) of the chiller 10, and a supply circulation loop (main loop) including the chiller 10 and the terminal device 30. When the actual medium temperature output by the chiller 10 meets the terminal requirements, the outlet of the chiller 10 is disconnected from the liquid return pipeline 20 and connected to the inlet of the terminal device 30, and the medium is supplied to the terminal device 30 through the supply circulation loop. When the actual medium temperature output by the chiller 10 does not meet the terminal requirements, the outlet of the chiller 10 is directly connected to the liquid return pipeline 20 and is not connected to the inlet of the terminal device 30, that is, the output of the chiller 10 is bypassed, and the chiller 10 is directly self-circulated through the liquid return pipeline 20 through the self-circulation loop, and the terminal device 30 is not supplied. After the medium temperature meets the terminal requirements, the medium is supplied to the terminal device 30 through the supply circulation loop, thereby ensuring that the temperature of the medium supplied to the terminal device 30 is relatively stable and will not fluctuate too much, meeting the process control requirements of the terminal device, and ensuring the stability of the operation of the chiller system.

[0039] In one embodiment, the on-off control of the medium circulation loop can be achieved by a valve. Figure 1 As shown, a first valve 40 is provided on the connecting pipeline between the outlet of each chiller 10 and the liquid return pipeline 20, and the first valve 40 is used to control the connection between the chiller 10 and the liquid return pipeline 20. A second valve 50 is provided on the connecting pipeline between the outlet of each chiller 10 and the inlet of the terminal device 30, and the second valve 50 is used to control the connection between the chiller 10 and the inlet of the terminal device 30. Through the first valve 40 and the second valve 50, the connection between the self-circulation loop and the supply circulation loop can be effectively controlled.

[0040] like Figure 2 As shown, each chiller 10 is provided with a corresponding first water pump 60. The first water pump 60 can be provided at the inlet of the chiller 10. After the chiller 10 and its corresponding first water pump 60 are connected in series, they serve as a chiller unit and are connected in parallel with other chiller units. The first water pump 60 is used to provide power for the medium to enter the chiller 10 and to control the flow rate of the medium entering the chiller 10. The rated flow rates of the first water pumps 60 configured for chillers 10 with the same rated cooling capacity can be the same or different.

[0041] The chiller system may further include: a first liquid storage tank 70, the first liquid storage tank 70 includes a first inlet 71, a second inlet 72 and an outlet 73, the first liquid storage tank 70 is connected to the liquid return pipeline 20 through the first inlet 71 and its own outlet 73, and the outlet of each chiller 10 can be connected to the second inlet 72 to achieve a disconnectable connection with the liquid return pipeline 20. The medium can be properly stored through the first liquid storage tank 70, so as to better realize the self-circulation of the chiller and avoid excessive medium circulating in the self-circulation loop.

[0042] like Figure 3 As shown, the chiller system may further include: a second liquid storage tank 80, the inlet of the second liquid storage tank 80 may be connected to the outlet of each chiller 10, and the outlet of the second liquid storage tank 80 may be connected to the inlet of the terminal device 30. That is, the outlet of each chiller 10 may be connected to the inlet of the terminal device 30 through the second liquid storage tank 80. In the case where the second liquid storage tank 80 is provided, the supply circulation loop also includes the second liquid storage tank 80, and the second liquid storage tank 80 may store a certain amount of medium. Since the medium is supplied to the terminal device 30 through the supply circulation loop when the actual medium temperature output by the chiller meets the terminal requirements, the medium is supplied to the terminal device 30 through the supply circulation loop, so the temperature of the medium stored in the second liquid storage tank 80 meets the terminal requirements. Generally, the bypass time of the chiller 10 is short, and the second liquid storage tank 80 may continuously supply the terminal device 30 with the medium that meets the requirements when the chiller 10 is bypassed, so as to avoid affecting the supply of the terminal device 30 when the chiller 10 is bypassed, ensure the continuity of the supply, and ensure the stability of the temperature of the supplied medium.

[0043] The chiller system may further include: a second water pump 90, located between the outlet of the second liquid storage tank 80 and the inlet of the terminal device 30. The second water pump 90 is used to provide power for the medium to enter the terminal device 30. The second water pump 90 may be a two-stage pump.

[0044] Embodiment 2

[0045] This embodiment provides a refrigeration system control method, which can be implemented based on the refrigeration system described in Example 1. The refrigeration system includes at least one refrigeration machine. This embodiment does not describe the structure of the refrigeration system in detail. Please refer to Example 1 for details.

[0046] Figure 4 is a flow chart of a chiller system control method provided in Embodiment 2 of the present invention. Figure 4 As shown, the method comprises the following steps:

[0047] S401, during the operation of the refrigeration system, monitoring the actual medium temperature output by the currently operating refrigeration machine 10.

[0048] S402 , if the actual medium temperature is not within the preset range required by the terminal device 30 , the medium output by the currently running refrigerator 10 is controlled to directly return to the refrigerator through the liquid return pipeline 20 without being supplied to the terminal device 30 .

[0049] S403 , after that, when the actual medium temperature is within the preset range required by the terminal device 30 , the medium output by the currently operating cold machine 10 is controlled to be supplied to the terminal device 30 .

[0050] The medium supplied by the chiller system to the terminal device 30 may be water or the like. Taking water as an example, the actual medium temperature output by the chiller is the actual outlet water temperature of the chiller.

[0051] The actual medium temperature monitored is the medium temperature at the designated location. The designated location may be the outlet of the chiller 10. If the medium temperature output by any chiller 10 is not within the preset range, the temperature of the mixed medium output by all currently running chillers 10 will not be within the preset range, resulting in the medium supplied to the terminal device 30 not meeting the terminal requirements. Therefore, by monitoring the medium temperature at the outlet of the chiller 10, the medium temperature supplied to the terminal device 30 can be known. The designated location may also be the intersection of the pipelines connected to the outlets of each chiller 10 and any location thereafter (such as Figure 3 Position C or position D), the medium temperature monitored at this position can more accurately and directly reflect the medium temperature supplied to the terminal device 30.

[0052] The preset range required by the terminal device 30 can be determined according to the medium temperature setting value of the terminal device 30. For example, the preset range can be [T 设 -T 0 , T 设 +T 0 ], where T 设 Indicates the medium temperature setting value of the terminal device 30, for example, 0.5°C, T 0 represents the first preset value, T 0 Indicates the accuracy requirement, which can be set according to the actual situation of the chiller system and user needs. For example, T 0 Can be set to 0.2℃.

[0053] The actual medium temperature is not within the preset range required by the terminal device 30, indicating that the actual medium temperature is not stable at the medium temperature setting value of the terminal device 30, and the medium cannot be delivered to the terminal device 30. The medium output by the currently running chiller 10 is controlled to return to the chiller directly through the return liquid pipeline 20, which is equivalent to bypassing the output of the currently running chiller 10 without passing through the terminal device 30, so that the currently running chiller 10 performs self-circulation and waits for the actual medium temperature to stabilize.

[0054] The actual medium temperature is within the preset range required by the terminal device 30 , which means that the actual medium temperature is stable at the medium temperature setting value of the terminal device 30 , and at this time, the medium that meets the terminal requirements can be delivered to the terminal device 30 .

[0055] The chiller system control method of this embodiment monitors the actual medium temperature output by the currently running chiller 10 during the operation of the chiller system; if the actual medium temperature is not within the preset range required by the terminal device 30, the medium output by the currently running chiller 10 is controlled to directly return to the chiller 10 through the return liquid pipeline 20, and is not supplied to the terminal device 30; thereafter, when the actual medium temperature is within the preset range required by the terminal device 30, the medium output by the currently running chiller 10 is controlled to be supplied to the terminal device 30. By bypassing the chiller output, when the actual medium temperature output by the chiller 10 is within the preset range required by the terminal device 30, the medium is delivered to the terminal device 30, so that the medium temperature supplied to the terminal device 30 can be ensured to be relatively stable without excessive fluctuations, so as to meet the process control requirements of the terminal device and ensure the stable operation of the chiller system.

[0056] In one embodiment, before monitoring the actual medium temperature output by the currently running chiller 10, it also includes: receiving a chiller system start-up signal; turning on a preset number of chillers 10, controlling the preset number of chillers 10 to operate at a preset temperature, and controlling the medium output by a preset number of chillers 10 to directly return to the chiller 10 through the return liquid pipeline 20 without supplying the terminal device 30, wherein the preset temperature is higher than the medium temperature setting value of the terminal device 30; when the actual medium temperature output by the preset number of chillers 10 stabilizes at the preset temperature, controlling the preset number of chillers 10 to operate according to the medium temperature setting value of the terminal device 30, and controlling the medium output by the preset number of chillers 10 to supply the terminal device 30.

[0057] Among them, the preset number can be set according to actual needs. Generally speaking, the preset number is set to 1, that is, one chiller is started when the chiller system is just turned on. The actual medium temperature output by the preset number of chillers 10 is the temperature of the specified position. The explanation of the specified position is as described above and will not be repeated here. The preset temperature can be the sum of the medium temperature setting value of the terminal device 30 and the second preset value △T. △T is a positive number and is generally set to a smaller value. For example, △T is set to 0.1°C or 0.2°C. The actual medium temperature is stable at the preset temperature, which means that the actual medium temperature fluctuates within a small range above and below the preset temperature, which is similar to the preset range required by the above-mentioned terminal device 30. The range corresponding to the stable preset temperature can be [T 1 -T 0 , T 1 +T 0 ], where T 1 Indicates the preset temperature, T 0 Indicates the first preset value.

[0058] This embodiment takes into account that when the refrigeration system is not started, the actual medium temperature in the pipeline may differ greatly from the medium temperature setting value. Therefore, when the refrigeration system is just started, the refrigeration output is bypassed to allow the refrigeration system to self-circulate at a preset temperature higher than the medium temperature setting value, thereby avoiding the refrigeration machine from suddenly increasing to a higher load, which is beneficial to the stable and reliable operation of the refrigeration machine. After the medium temperature stabilizes at the preset temperature, the medium is provided to the terminal device according to the medium temperature setting value, ensuring that the provided medium temperature can meet the requirements of the terminal process control.

[0059] In one embodiment, a first water pump 60 is correspondingly provided at the inlet of each chiller 10, and the above method may further include: during the operation of the chiller system, monitoring the actual load rate of the currently operating chiller 10; if the actual load rate reaches a first preset load value, prohibiting the frequency increase of the first water pump 60 corresponding to the currently operating chiller 10; if the actual load rate reaches a second preset load value, prohibiting the frequency reduction of the first water pump 60 corresponding to the currently operating chiller 10; wherein the first preset load value is greater than the second preset load value.

[0060] The actual load rate refers to the ratio of the actual cooling capacity of the chiller to the rated cooling capacity. The first preset load value is a threshold used to measure whether the chiller 10 is operating at full load, and the second preset load value is a threshold used to measure whether the chiller 10 is operating at minimum load. Both the first preset load value and the second preset load value can be set according to the actual situation of the chiller system. For example, the first preset load value is set to 95%, and the second preset load value is set to 30%.

[0061] The actual load rate of the chiller reaches the first preset load value, indicating that the chiller is running at full load and has reached its maximum processing capacity. If the frequency of the first water pump corresponding to the chiller is increased at this time, the medium flow entering the chiller will increase. Since the chiller is already running at full load and cannot handle it, the actual medium temperature output by the chiller will increase. In this case, the frequency of the first water pump corresponding to the chiller is prohibited from increasing, which can avoid the increase in the medium temperature output by the chiller and maintain the stability of the medium temperature.

[0062] The actual load rate reaches the second preset load value, indicating that the chiller is running at a low load and has reached the minimum processing capacity of the chiller. If the frequency of the first water pump corresponding to the chiller is reduced at this time, the medium flow rate input to the chiller will decrease. Since the chiller is already running at the minimum load, the load cannot be further reduced, which will cause the actual medium temperature output by the chiller to decrease. In this case, prohibiting the frequency of the first water pump corresponding to the chiller from being reduced can avoid the temperature of the medium output by the chiller from decreasing and maintain the stability of the medium temperature. At the same time, it can prevent the temperature of the medium output by the chiller from dropping to 0°C or below 0°C, causing ice to freeze and damage pipelines or components, and play a certain protective role in the antifreeze of the chiller.

[0063] This implementation manner regulates and limits the frequency of the corresponding first water pump according to the actual load rate of the refrigerator, which can ensure the stability of the temperature of the medium output by the refrigerator and also provide certain protection for the refrigerator from freezing.

[0064] It should be noted that, in this embodiment, for each of the currently operating chillers 10, the medium temperature entering each chiller 10 is the same, and the medium temperature setting value is also the same, so the actual load rate of each chiller 10 is also the same, and the actual medium temperature output by each chiller 10 is the same. In this embodiment, the frequency of the corresponding currently operating first water pump 60 is adjusted according to the actual medium temperature output by the currently operating chiller 10, so the frequencies of the currently operating first water pumps 60 are also the same. In other words, during the operation of the chiller system, the load rate of each of the currently operating chillers 10 is synchronously adjusted, and the frequencies of each of the currently operating first water pumps 60 are also synchronously adjusted.

[0065] In one embodiment, after monitoring the actual load rate of the currently running chiller 10, it also includes: if the actual load rate reaches the first preset load value and lasts for a preset time, an additional chiller 10 is turned on. Among them, the preset time can be set according to the actual situation. The preset time is generally set to be short, so that the new chiller can be turned on in time and the medium temperature can be stable. For example, the preset time can be set to 5 to 10 minutes. When a chiller 10 is turned on, the first water pump 60 corresponding to the chiller 10 is also turned on. The load rate of the newly turned on chiller 10 is consistent with that of the already running chiller 10, and then the load rate of these chillers 10 is synchronously adjusted according to a certain control logic, for example, the chiller load rate is controlled based on the inlet and outlet water temperature difference of the chiller. The frequency of the first water pump 60 corresponding to the newly turned on chiller 10 is consistent with the frequency of the already running first water pump 60, and then the frequency of these first water pumps 60 is synchronously adjusted according to a certain control logic. For example, if the actual medium temperature output by the chiller 10 is higher than the medium temperature setting value, the frequency of the first water pump 60 is increased. In this embodiment, when the refrigeration machine runs at full load for a preset period of time, an additional refrigeration machine is promptly started to meet the terminal demand.

[0066] In one embodiment, after monitoring the actual load rate of the currently running chiller 10, the method further includes: if the actual load rate reaches a second preset load value and lasts for a preset time, shutting down a chiller 10. When shutting down a chiller 10, the first water pump 60 corresponding to the chiller 10 is also shut down. After shutting down a chiller 10, the load rate of the chiller 10 that is still running is synchronously adjusted according to a certain control logic, and the frequency of the first water pump 60 that is still running is synchronously adjusted according to a certain control logic. In this embodiment, when the chiller runs at low load for a preset time, a chiller is shut down in time to reduce energy consumption.

[0067] Furthermore, shutting down a chiller 10 includes: determining the number of chillers 10 currently in operation; if only one chiller 10 is currently on and the terminal device 30 has no load demand, shutting down the chiller 10; if only one chiller 10 is currently on and the terminal device 30 still has a load demand, controlling the chiller 10 to maintain the current operating state. Combining the number of chillers in operation and the load demand of the terminal device to perform control can ensure the effective operation and energy saving of the chiller system and maintain the stability of the medium temperature provided by the chiller system.

[0068] The refrigeration system includes at least one refrigeration machine 10, the inlet of each refrigeration machine 10 is connected to the outlet of the terminal device 30 through the return liquid pipeline 20, and the outlet of each refrigeration machine 10 can be connected to the return liquid pipeline 20 in an on-off manner, and the outlet of each refrigeration machine 10 can be connected to the inlet of the terminal device 30 in an on-off manner.

[0069] In one embodiment, a first valve 40 is provided on the connecting pipeline between the outlet of each chiller 10 and the liquid return pipeline 20, and a second valve 50 is provided on the connecting pipeline between the outlet of each chiller 10 and the inlet of the terminal device 30. Specifically, the medium output by the currently running chiller 10 is controlled to return directly to the chiller 10 through the liquid return pipeline 20 without being supplied to the terminal device 30, including: controlling the first valve 40 corresponding to the currently running chiller 10 to open, and controlling the second valve 50 corresponding to the currently running chiller 10 to close; controlling the medium output by the currently running chiller 10 to supply the terminal device 30, including: controlling the first valve 40 corresponding to the currently running chiller 10 to close, and controlling the second valve 50 corresponding to the currently running chiller 10 to open. This embodiment realizes the on-off control of the medium circulation loop by controlling the valve, bypasses the chiller 10 or provides a temperature-stable medium to the terminal device 30, and the control is simple and reliable.

[0070] Embodiment 3

[0071] This embodiment describes the above-mentioned chiller system control method in conjunction with a specific example. However, it is worth noting that this specific embodiment is only for better illustrating the present application and does not constitute an improper limitation on the present application. The explanation of terms that are the same or corresponding to the above-mentioned embodiment will not be repeated in this embodiment.

[0072] In this embodiment, water is taken as the medium for example, that is, the refrigerator outputs chilled water.

[0073] After the chiller system is turned on, it takes some time for the chiller outlet water temperature to reach the set outlet water temperature. For chiller systems used in process fields, the fluctuation limit of the outlet water temperature is relatively strict, and stable temperature chilled water must be provided to the end.

[0074] The specific control methods are as follows:

[0075] When the chiller system is started for the first time, a chiller 10 is started first. Specifically, the first valve 40 corresponding to the chiller 10 is opened first, and then the first water pump 60 (i.e., the chilled water pump) corresponding to the chiller 10 is turned on, and then the chiller 10 is turned on. The target water outlet temperature of the chiller 10 is set to T 1 (i.e. preset temperature), T 1 =T 设 +△T,T 设 represents the set outlet water temperature of the terminal device 30, ΔT is a positive number, and the value of ΔT is generally small. For example, T 设 =0.5℃, △T=0.2℃, T 1 =0.7℃. At this time, the chilled water in the system is self-circulating in the currently running chiller 10 and the first liquid storage tank 70 (i.e., the return water tank). That is, the chilled water from the chiller 10 enters the first liquid storage tank 70, and the chilled water from the first liquid storage tank 70 returns to the chiller 10. The chilled water temperature is lowered by self-circulation. When the chiller outlet water temperature is stabilized at T 1 When the first valve 40 corresponding to the refrigerator 10 is closed, the second valve 50 corresponding to the refrigerator 10 is opened, and the target outlet water temperature of the refrigerator is reset to T 设 At this time, the actual outlet water temperature of the chiller is the temperature required by the terminal device 30, and water can be supplied to the terminal device 30.

[0076] Before the cooling system is started, the water in the system pipeline is at a high temperature due to the heat absorption of the pipeline. 1 (Higher than T 设 ) to control the chiller operation and not supply water to the end, and wait until the chiller outlet water temperature stabilizes at T 1 When T 设 Controlling the operation of the chiller and supplying water to the terminal ensures that the load of the chiller does not need to be increased a lot at once when the system is just started, which is conducive to the stable and reliable operation of the chiller.

[0077] During the operation of the chiller system, it is necessary to continuously ensure that the actual outlet water temperature of the chiller is stable at T 设 Specifically, the frequency of the first water pump 60 can be adjusted and limited according to the chiller load rate to maintain the chiller outlet water temperature.

[0078] (1) When the actual load rate of the currently running chiller 10 reaches full load operation (for example, the actual load rate reaches 95%), the frequency of the first water pump 60 corresponding to the chiller is controlled, and the frequency increase of the first water pump 60 is prohibited to maintain the chiller outlet water temperature at T 设Specifically, the full-load operation of the chiller indicates that the maximum processing capacity of the chiller has been reached, that is, the maximum processing capacity can only process the current chiller inlet and outlet water temperature difference and the current water flow rate. If the frequency of the corresponding first water pump is increased at this time, the water flow rate becomes larger and the chiller cannot process it. The actual outlet water temperature will increase, resulting in unstable outlet water temperature. Therefore, when the chiller is running at full load, prohibiting the first water pump 60 from increasing the frequency can maintain the stable outlet water temperature of the chiller.

[0079] If the currently running chiller 10 runs at full capacity for t1 time (equivalent to the above preset time, such as 5 to 10 minutes), an additional chiller 10 is started to better maintain the chiller outlet water temperature and meet the terminal demand. In addition, the frequency of the first water pump 60 corresponding to the newly started chiller 10 is consistent with the frequency of the already running first water pump 60.

[0080] (2) When the actual load rate of the currently running chiller 10 is at a low load (for example, the actual load rate is 30%), the chiller outlet water temperature is maintained at T by prohibiting the first water pump 60 corresponding to the chiller from reducing the frequency. 设 Specifically, the low-load operation of the chiller indicates that the chiller's minimum processing capacity has been reached. If the frequency of the chilled water pump is reduced at this time, the water flow rate will decrease. Since the chiller has reached the minimum load and cannot continue to reduce the load, the actual outlet water temperature will decrease, resulting in unstable outlet water temperature. Therefore, when the chiller is running at a low load, the first water pump 60 is prohibited from reducing the frequency, which can maintain the chiller outlet water temperature stable and prevent the actual outlet water temperature from dropping to 0°C or below 0°C, causing ice to freeze and damage pipes or components, thereby playing a certain protective role in the anti-freezing of the chiller.

[0081] If the currently running chiller 10 is in low-load operation for t1 consecutive times, one chiller 10 can be reduced. If only one chiller 10 is running and there is no load demand at the terminal, the chiller 10 can be shut down. If there is still load demand at the terminal, the current operation state of the chiller 10 is maintained.

[0082] During the normal operation of the chiller system, the chiller outlet water temperature has stabilized at T 设 , and supply water to the terminal normally, monitor the outlet water temperature of the chiller in real time, and when the outlet water temperature of the chiller does not meet the terminal requirements (i.e., it cannot be stabilized at T 设 ), the chilled water supply and return water is bypassed, and the chiller outlet water is supplied to the first liquid storage tank 70 for circulation. 设), turn off the bypass (i.e. close the first valve 40), switch back to the main route (i.e. open the second valve 50), and the water outlet of the chiller enters the second liquid storage tank 80 to supply water to the terminal device 30, thereby ensuring the stability of the water supply during the operation of the system. For example, during the operation of the chiller system, the terminal load demand suddenly increases, and the water temperature returning from the terminal device 30, which should have been 12°C, suddenly rises to 15°C. At this time, the currently running chiller may suddenly be unable to handle it, and the actual outlet water temperature cannot meet the terminal requirements. For example, the original set outlet water temperature is 0.5°C, and the actual outlet water temperature may become 1°C or 1.5°C. At this time, water cannot be supplied to the terminal, and self-circulation is performed through the bypass. After the chiller load rate increases or a new chiller is turned on, if the chiller outlet water temperature meets the terminal requirements, water can continue to be supplied to the terminal. It should be noted that a certain amount of chilled water can be placed in the second liquid storage tank 80 and the stored chilled water meets the terminal requirements. The bypass time will not be very long. During this period, the water in the second liquid storage tank 80 is sufficient for the terminal to use. While ensuring the stability of the chiller outlet water temperature, it will not affect the water supply to the terminal.

[0083] This embodiment uses the chilled water supply and return bypass method to ensure that the chilled water outlet temperature is stable before supplying chilled water to the terminal when the system is first started, ensuring that the chilled water supply temperature can meet the requirements of the terminal process control. During the operation of the system, the chilled water outlet temperature is monitored in real time. When it does not meet the terminal requirements, the chilled water supply and return are bypassed, and then switched back to the main route to supply water to the terminal after the terminal requirements are met again. In addition, the frequency of the chilled water pump is adjusted and limited according to the chiller load rate, which ensures the stability of the chiller outlet water temperature on the one hand, and provides a certain degree of protection for the chiller from freezing on the other.

[0084] This embodiment ensures the chiller outlet water temperature continuously and stably by bypassing the chilled water outlet and limiting the frequency of the chilled water pump according to the chiller load rate, ensuring that the chiller outlet water temperature does not fluctuate too much and meets the terminal process requirements, thereby ensuring the stability of the system operation.

[0085] Embodiment 4

[0086] Based on the same inventive concept, this embodiment provides a chiller system control device, which can be used to implement the chiller system control method described in the above embodiment. The device can be implemented by software and / or hardware, and the device can generally be integrated into a controller of the chiller system. The chiller system includes at least one chiller 10.

[0087] Figure 5 is a structural block diagram of a chiller system control device provided in Embodiment 3 of the present invention, such as Figure 5 As shown, the device comprises:

[0088] The first monitoring module 51 is used to monitor the actual medium temperature output by the currently running refrigerator 10 during the operation of the refrigerator system;

[0089] The first control module 52 is used to control the medium output by the currently running refrigerator 10 to directly return to the refrigerator through the liquid return pipeline 20 without supplying the terminal device 30 if the actual medium temperature is not within the preset range required by the terminal device 30;

[0090] The second control module 53 is used to control the medium output by the currently running refrigerator 10 to supply the terminal device 30 when the actual medium temperature is within the preset range required by the terminal device 30 .

[0091] Optionally, the refrigeration system control device further includes:

[0092] A receiving module, used for receiving a cooling system startup signal before monitoring the actual medium temperature output by the currently running cooling machine 10;

[0093] A third control module is used to start a preset number of refrigerators 10, control the preset number of refrigerators 10 to operate at a preset temperature, and control the medium output by the preset number of refrigerators 10 to directly return to the refrigerators 10 through the return liquid pipeline 20 without supplying the terminal device 30, wherein the preset temperature is higher than the medium temperature setting value of the terminal device 30;

[0094] The fourth control module is used to control the preset number of refrigerators 10 to operate according to the medium temperature setting value of the terminal device 30 when the actual medium temperature output by the preset number of refrigerators 10 is stabilized at the preset temperature, and to control the medium output by the preset number of refrigerators 10 to be supplied to the terminal device 30.

[0095] Optionally, a first water pump 60 is correspondingly provided at the inlet of each of the chillers 10, and the chiller system control device further includes:

[0096] The second monitoring module is used to monitor the actual load rate of the currently operating refrigerator 10 during the operation of the refrigerator system;

[0097] A fifth control module, configured to prohibit frequency increase of the first water pump 6 corresponding to the currently running chiller 10 if the actual load rate reaches a first preset load value;

[0098] a sixth control module, configured to prohibit frequency reduction of the first water pump 60 corresponding to the currently running chiller 10 if the actual load rate reaches a second preset load value;

[0099] Wherein, the first preset load value is greater than the second preset load value.

[0100] Optionally, the refrigeration system control device further includes: a seventh control module, which is used to start up an additional refrigeration machine 10 after monitoring the actual load rate of the currently running refrigeration machine 10 if the actual load rate reaches the first preset load value and lasts for a preset time.

[0101] Optionally, the refrigeration system control device further includes: an eighth control module, which is used to shut down a refrigeration machine 10 after monitoring the actual load rate of the currently running refrigeration machine 10 if the actual load rate reaches the second preset load value and lasts for a preset time.

[0102] Optionally, the eighth control module is specifically used to: determine the number of the currently running cold machines 10; if only one cold machine 10 is currently turned on and the terminal device 30 has no load demand, then turn off the cold machine 10; if only one cold machine 10 is currently turned on and the terminal device 30 still has a load demand, then control the cold machine 10 to maintain the current operating state.

[0103] Optionally, the inlet of each of the refrigerators 10 is connected to the outlet of the terminal device 30 through the liquid return pipeline 20, and the outlet of each of the refrigerators 10 can be connected to the liquid return pipeline 20 in an on-off manner, and the outlet of each of the refrigerators 10 can be connected to the inlet of the terminal device 30 in an on-off manner.

[0104] Optionally, a first valve 40 is provided on the connecting pipeline between the outlet of each refrigerator 10 and the liquid return pipeline 20, and a second valve 50 is provided on the connecting pipeline between the outlet of each refrigerator 10 and the inlet of the terminal device 30;

[0105] The first control module 52 is specifically used to: control the first valve 40 corresponding to the currently running cold machine 10 to open, and control the second valve 50 corresponding to the currently running cold machine 10 to close;

[0106] The second control module 53 is specifically used to control the first valve 40 corresponding to the currently running refrigerator 10 to be closed, and control the second valve 50 corresponding to the currently running refrigerator 10 to be opened.

[0107] The specific structure of the refrigeration system is described in Example 1. The above-mentioned refrigeration system control device can execute the refrigeration system control method provided in the embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details not described in detail in this embodiment, please refer to the refrigeration system control method and refrigeration system provided in the embodiment of the present invention.

[0108] Embodiment 5

[0109] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the embodiment of the present invention when executing the computer program.

[0110] Embodiment 6

[0111] This embodiment provides a non-volatile computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the embodiment of the present invention are implemented.

[0112] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A chiller system control method, characterized in that: The refrigeration system includes at least one refrigeration machine, and the method includes: During the operation of the cooling system, the actual medium temperature output by the cooling machine currently in operation is monitored; If the actual medium temperature is not within the preset range required by the terminal device, the medium output by the currently running chiller is controlled to directly return to the chiller through the liquid return pipeline without being supplied to the terminal device; Afterwards, when the actual medium temperature is within the preset range required by the terminal device, the medium output by the currently operating refrigerator is controlled to be supplied to the terminal device; A first water pump is correspondingly provided at the inlet of each of the chillers, and the method further comprises: During the operation of the refrigeration system, monitoring the actual load rate of the refrigeration machine currently in operation; If the actual load rate reaches the first preset load value, the frequency increase of the first water pump corresponding to the currently running chiller is prohibited; If the actual load rate reaches the second preset load value, it is prohibited to reduce the frequency of the first water pump corresponding to the currently running chiller; Wherein, the first preset load value is greater than the second preset load value.

2. The method according to claim 1, characterized in that Before monitoring the actual medium temperature output by the currently running chiller, it also includes: Receive the cooling system start-up signal; Turn on a preset number of chillers, control the preset number of chillers to operate at a preset temperature, and control the medium output by the preset number of chillers to directly return to the chillers through the liquid return pipeline without supplying the terminal device, wherein the preset temperature is higher than the medium temperature setting value of the terminal device; When the actual medium temperature output by the preset number of refrigerators is stabilized at the preset temperature, the preset number of refrigerators are controlled to operate according to the medium temperature setting value of the terminal device, and the medium output by the preset number of refrigerators is controlled to be supplied to the terminal device.

3. The method according to claim 1, characterized in that After monitoring the actual load rate of the currently running chiller, the method further includes: If the actual load rate reaches the first preset load value and lasts for a preset time, an additional refrigerator is started.

4. The method according to claim 1, characterized in that: After monitoring the actual load rate of the currently running chiller, the method further includes: If the actual load rate reaches the second preset load value and lasts for a preset time, a cooling machine is shut down.

5. The method according to claim 4, characterized in that Shut down a chiller, including: Determining the number of the currently operating chillers; If only one chiller is currently turned on and the terminal equipment has no load demand, then turn off the chiller; If only one chiller is currently turned on and the terminal equipment still has load demand, the chiller is controlled to maintain the current operating state.

6. The method according to any one of claims 1 to 5, characterized in that The inlet of each refrigerator is connected to the outlet of the terminal device through the liquid return pipeline; the outlet of each refrigerator can be connected to the liquid return pipeline in an on-off manner; the outlet of each refrigerator can be connected to the inlet of the terminal device in an on-off manner.

7. The method according to claim 6, characterized in that A first valve is provided on the connecting pipeline between the outlet of each refrigerator and the liquid return pipeline, and a second valve is provided on the connecting pipeline between the outlet of each refrigerator and the inlet of the terminal device; Controlling the medium output by the currently running chiller to directly return to the chiller through the liquid return pipeline without supplying the terminal device, including: controlling the first valve corresponding to the currently running chiller to open, and controlling the second valve corresponding to the currently running chiller to close; Controlling the medium output by the currently running refrigerator to supply the terminal device includes: controlling a first valve corresponding to the currently running refrigerator to close, and controlling a second valve corresponding to the currently running refrigerator to open.

8. The method according to claim 6, characterized in that The refrigeration system also includes: a first liquid storage tank, the first liquid storage tank includes a first inlet, a second inlet and an outlet, the first liquid storage tank is connected to the return liquid pipeline through the first inlet and its own outlet, and the outlet of each of the refrigeration machines can be connected to the second inlet in an on-off manner to achieve connection with the return liquid pipeline.

9. The method according to claim 6, characterized in that The refrigerator system further includes: a second liquid storage tank, the inlet of which is connectable and disconnectable to the outlet of each refrigerator, and the outlet of which is connected to the inlet of the terminal device.

10. The method according to claim 9, characterized in that The refrigeration system further includes: a second water pump located between the outlet of the second liquid storage tank and the inlet of the terminal device.

11. A cooling system, characterized in that: include: At least one chiller; The inlet of each of the chillers is connected to the outlet of the terminal equipment through a liquid return pipeline; The outlet of each of the refrigerators can be connected to the liquid return pipeline in an on-off manner; The outlet of each of the refrigerators can be connected to the inlet of the terminal equipment in an on-off manner; A first water pump is correspondingly arranged at the inlet of each of the chillers. During the operation of the chiller system, the actual load rate of the currently operating chiller is monitored; if the actual load rate reaches a first preset load value, the frequency increase of the first water pump corresponding to the currently operating chiller is prohibited; If the actual load rate reaches a second preset load value, it is prohibited to reduce the frequency of the first water pump corresponding to the currently running chiller; wherein the first preset load value is greater than the second preset load value.

12. The refrigeration system according to claim 11, characterized in that: A first valve is provided on the connecting pipeline between the outlet of each refrigerator and the liquid return pipeline, and a second valve is provided on the connecting pipeline between the outlet of each refrigerator and the inlet of the terminal device.

13. The refrigeration system according to claim 11, characterized in that: The refrigeration system also includes: a first liquid storage tank, the first liquid storage tank includes a first inlet, a second inlet and an outlet, the first liquid storage tank is connected to the return liquid pipeline through the first inlet and its own outlet, and the outlet of each of the refrigeration machines can be connected to the second inlet in an on-off manner to achieve connection with the return liquid pipeline.

14. The refrigeration system according to any one of claims 11 to 13, characterized in that: The refrigerator system further includes: a second liquid storage tank, the inlet of which is connectable and disconnectable to the outlet of each refrigerator, and the outlet of which is connected to the inlet of the terminal device.

15. The refrigeration system according to claim 14, characterized in that: The refrigeration system further includes: a second water pump located between the outlet of the second liquid storage tank and the inlet of the terminal device.

16. A chiller system control device, characterized in that: The refrigeration system comprises at least one refrigeration machine, and the device comprises: The first monitoring module is used to monitor the actual medium temperature output by the currently running chiller during the operation of the chiller system; A first control module is used to control the medium output by the currently running chiller to directly return to the chiller through the liquid return pipeline without supplying the terminal device if the actual medium temperature is not within the preset range required by the terminal device; A second control module is used to control the medium output by the currently running refrigerator to supply the terminal device when the actual medium temperature is within the preset range required by the terminal device; A first water pump is correspondingly arranged at the inlet of each of the chillers, and the chiller system control device further comprises: The second monitoring module is used to monitor the actual load rate of the currently running refrigerator during the operation of the refrigerator system; a fifth control module, configured to prohibit frequency increase of the first water pump corresponding to the currently running chiller if the actual load rate reaches a first preset load value; a sixth control module, configured to prohibit frequency reduction of the first water pump corresponding to the currently running chiller if the actual load rate reaches a second preset load value; Wherein, the first preset load value is greater than the second preset load value.

17. An electronic device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 10 when executing the computer program.

18. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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