Control method and control device of multi-unit refrigerating system and multi-unit refrigerating system

Abstract

The invention relates to the technical field of heat exchange, and provides a control method and device of a multi-unit refrigerating system and the multi-unit refrigerating system.The control method comprises the steps that a setting signal which is sent by a previous main control assembly and serves as a current main control assembly is received, and the main control assembly is adjusted and set according to the setting signal, the current main control assembly is one of all the control assemblies determined by the previous main control assembly according to the operation state of all the control assemblies of the multi-unit refrigerating system and a preset control rule; and the system target temperature of the multi-unit refrigerating system is obtained, and the working mode of each heat exchange unit of the multi-unit refrigerating system is controlled according to the system target temperature. The multi-unit refrigerating system does not need to be externally connected with a centralized control system, the multiple heat exchange units communicate with one another through a network protocol, the centralized control system is not needed, extra equipment cost and maintenance cost are reduced, control assemblies of the heat exchange units are used for control, and debugging matching performance is good.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, and in particular to a control method and a control device for a multi-unit refrigeration system, and a multi-unit refrigeration system. Background Art

[0002] In order to maintain a comfortable ambient temperature in medium and large commercial and living places, multi-unit refrigeration systems have become an indispensable heat exchange equipment. Due to the wide range of refrigeration capacity, multi-unit refrigeration systems are widely used in various types of buildings such as household central air conditioners, shopping malls, factories, hospitals, etc. Traditional multi-split air conditioners generally have heat pump air conditioners for cooling and heating, or water heaters for hot water, or air conditioning water heaters with cooling, heating, hot water and simultaneous cooling and hot water functions, or energy-saving air conditioners with cold storage functions. In the related technology, multiple units of the multi-unit refrigeration system need to be controlled by an external centralized control system, which requires additional equipment investment and maintenance costs, and the debugging and matching performance between multiple units is poor. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a control method for a multi-unit refrigeration system, in which one of the control components is determined as the current main control component according to the operating status of each control component of the multi-unit refrigeration system and a predetermined control rule, and no additional centralized control system is required, thereby reducing equipment cost and maintenance cost. The control is performed by the control component of the heat exchange unit itself, and the debugging matching is better.

[0004] The invention also provides a control device for a multi-unit refrigeration system.

[0005] The invention also provides a multi-unit refrigeration system.

[0006] According to a control method for a multi-unit refrigeration system provided by an embodiment of a first aspect of the present invention, the multi-unit refrigeration system includes a plurality of heat exchange units, and each of the heat exchange units includes a control component, and the control method includes:

[0007] Receiving a setting signal as the current main control component sent by a previous main control component, and adjusting the setting to be the main control component according to the setting signal, wherein the current main control component is one of the control components determined by the previous main control component according to the operating status of each control component of the multi-unit refrigeration system and a predetermined control rule, and the previous main control component includes any one of the control components that are in the starting state when the multi-unit refrigeration system is started, or in the starting state when the last running main control component is in the shutdown state;

[0008] Obtain the system target temperature of the multi-unit refrigeration system, and control the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature.

[0009] According to an embodiment of the present invention, the step of controlling the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature includes:

[0010] Determine the heat exchange units to enter the working state, the target refrigerant flow rate corresponding to the heat exchange units, and the target refrigerant outlet temperature corresponding to the heat exchange units according to the system target temperature and the pre-obtained allocation relationship;

[0011] Send signals to the corresponding heat exchange units to operate at the target refrigerant flow rate and the target refrigerant outlet temperature respectively.

[0012] According to an embodiment of the present invention, after the step of controlling the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature, it further includes:

[0013] After the first preset duration, obtain the actual refrigerant outlet temperature of the multi-unit refrigeration system, the refrigerant outlet temperature and the load level of each heat exchange unit in the working state;

[0014] Control the operation of the heat exchange units in the working state respectively according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship.

[0015] According to an embodiment of the present invention, the step of controlling the operation of the heat exchange units in the working state respectively according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship includes:

[0016] When the actual refrigerant outlet temperature is higher than the first temperature, sort the heat exchange units with the refrigerant outlet temperature higher than the first temperature according to the load level, where the first temperature is equal to the sum of the system target temperature and the preset target temperature deviation value;

[0017] Control the refrigerant outlet temperature of the corresponding heat exchange units to the system target temperature in sequence according to the load level from low to high or control the corresponding heat exchange units to the full-load state in sequence.

[0018] According to an embodiment of the present invention, after the step of sequentially controlling the refrigerant outflow temperature of the corresponding heat exchange unit to the system target temperature or sequentially controlling the corresponding heat exchange unit to the full-load state according to the load level from low to high, the method further includes:

[0019] After a second preset time period, obtain the actual refrigerant outflow temperature of the multi-unit refrigeration system, the refrigerant outflow temperature of each heat exchange unit in the working state, and the load level.

[0020] When the actual refrigerant outflow temperature is higher than the first temperature, sequentially control the refrigerant outflow temperature of the corresponding heat exchange unit to the balance temperature according to the load level from low to high; wherein, the balance temperature is equal to the difference between the system target temperature and the preset target temperature adjustment gradient value.

[0021] According to an embodiment of the present invention, the step of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outflow temperature, the refrigerant outflow temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship includes:

[0022] When the actual refrigerant outflow temperature is less than the second temperature, sort the multiple heat exchange units according to the load level from high to low, wherein the second temperature is equal to the difference between the system target temperature and the preset target temperature deviation value.

[0023] Sequentially send signals to the corresponding heat exchange units to adjust to the optimal working condition according to the load level from high to low.

[0024] According to an embodiment of the present invention, the step of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outflow temperature, the refrigerant outflow temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship includes:

[0025] When the actual refrigerant outflow temperature is less than the second temperature, sort the multiple heat exchange units according to the load level from high to low, wherein the second temperature is equal to the difference between the system target temperature and the preset target temperature deviation value.

[0026] Sequentially send signals to the corresponding heat exchange units to adjust the target refrigerant outflow temperature to be greater than or equal to the second temperature according to the load level from high to low.

[0027] According to an embodiment of the present invention, after the step of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outflow temperature, the refrigerant outflow temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship, the method further includes:

[0028] After a third preset duration, obtain the actual refrigerant outflow temperature of the multi-unit refrigeration system;

[0029] When the actual refrigerant outflow temperature is less than the second temperature, send a shutdown signal.

[0030] The control device of the multi-unit refrigeration system according to the second aspect embodiment of the present invention includes:

[0031] A receiving module, configured to receive a setting signal sent by a previous master control component as the current master control component, and adjust to be the master control component according to the setting signal, where the current master control component is one of the control components determined by the previous master control component according to the operating states of the control components of the multi-unit refrigeration system and a predetermined control rule, and the previous master control component includes the master control component that was in the startup state during the last operation when the multi-unit refrigeration system was started, or any one of the control components that was in the startup state when the last operation master control component was in the shutdown state;

[0032] An obtaining module, configured to obtain the system target temperature of the multi-unit refrigeration system, and control the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature.

[0033] The multi-unit refrigeration system according to the third aspect embodiment of the present invention includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps of the control method of the multi-unit refrigeration system according to the first aspect embodiment of the present invention.

[0034] One or more of the above technical solutions in the present invention have at least one of the following technical effects:

[0035] According to an embodiment of the present invention, a control method for a multi-unit refrigeration system includes the following steps: receiving a setting signal sent by a previous main control component as a current main control component, and adjusting the setting to be a main control component according to the setting signal, wherein the current main control component is one of the control components determined by the previous main control component according to the operating status of each control component of the multi-unit refrigeration system and a predetermined control rule, and the previous main control component includes the last running main control component in the starting state when the multi-unit refrigeration system is started, or any main control component in the control component in the starting state when the last running main control component is in the shutdown state; obtaining the system target temperature of the multi-unit refrigeration system, and controlling the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature. When the multi-unit refrigeration system is running, the previous main control component first detects the operating status of the control components of the multiple heat exchange units, and then determines one of them as the current main control component according to the predetermined control rule, and then the control component determined as the current main control component controls the operation of the multi-unit refrigeration system for a period of time. The multi-unit refrigeration system does not require an external centralized control system. The multiple heat exchange units communicate through network protocols, and no additional centralized control system is required, which reduces additional equipment costs and maintenance costs. In addition, the heat exchange unit is controlled by its own control components, and the debugging matching is better. At the same time, the main control component can determine the corresponding working mode for different heat exchange units. Each heat exchange unit sets a different target refrigerant outflow temperature according to its actual capacity to meet the system target temperature and the optimal operation of the multi-unit refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 One of the flow charts of the control method of the multi-unit refrigeration system provided by the embodiment of the present invention;

[0038] Figure 2 A second flowchart of a control method for a multi-unit refrigeration system provided by an embodiment of the present invention;

[0039] Figure 3 A schematic structural diagram of a control device for a multi-unit refrigeration system provided by an embodiment of the present invention;

[0040] Figure 4 A schematic structural diagram of a multi-unit refrigeration system provided in an embodiment of the present invention.

[0041] Reference numerals:

[0042] 301. Acquisition module; 302. Control module. Detailed implementation manner

[0043] To make the objectives, technical solutions and advantages of the invention clearer, the technical solutions in the invention will be clearly described below in conjunction with the accompanying drawings in the invention. Obviously, the described embodiments are some but not all of the embodiments of the invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the invention without creative efforts shall fall within the scope of protection of the invention.

[0044] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0046] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0047] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0048] In the related art, multiple units of a multi-unit refrigeration system need to be externally connected to a centralized control system for control, which requires additional equipment investment and maintenance costs, and the commissioning and matching performance between multiple units is poor.

[0049] The multi-unit refrigeration system according to the embodiments of the present invention includes a total return water pipeline, a total outlet water pipeline, and multiple heat exchange units. Each heat exchange unit includes a control component, and the multiple heat exchange units are connected in parallel and arranged between the total return water pipeline and the total outlet water pipeline.

[0050] For example, in a multi-unit refrigeration system, there are n heat exchange units in total, sharing a refrigerant circulation system, and communication between each heat exchange unit is through a network protocol. T 0 : System target temperature; T n : Target refrigerant outlet temperature of the nth unit; Ln: Refrigerant flow rate of the nth unit; Tn: Refrigerant outlet temperature of the nth unit; t: Target temperature adjustment gradient value; t1: Target temperature deviation value; K: Unit low-efficiency load value; The actual refrigerant outlet temperature T = (T1*L1 + T2*L2 + T3*L3 +... + Tn*Ln) / (L1 + L2 + L3 +... + Ln). The load level of the heat exchange unit refers to the ratio between the actual operating power and the rated operating power, and the ratio can also be divided into multiple intervals, and the load level of the heat exchange unit is defined through the intervals.

[0051] According to the control method of the multi-unit refrigeration system provided by the first aspect embodiment of the present invention, please refer to Figure 1 , including the following content:

[0052] S100. Receive the setting signal sent by the previous master control component as the current master control component, and adjust and set it as the master control component according to the setting signal.

[0053] It can be understood that the multi-unit refrigeration system does not have an external centralized control system, so the control component of each heat exchange unit has the possibility of being the main control component. Among them, the current main control component is one of the control components determined by the previous main control component according to the operating states of the control components of the multi-unit refrigeration system and the predetermined control rules. The previous main control component includes the main control component that was in the startup state during the last operation when the multi-unit refrigeration system was started, or any one of the control components in the startup state when the main control component of the last operation was in the shutdown state. The operating state of the control component includes the startup state (power-on state) and the shutdown state, and only the control component in the startup state can be determined as the current main control component. Generally, the previous main control component is the main control component of the last operation. After determining the current main control component, it completes the handover and becomes an ordinary control component, while the current main control component controls the system operation. In some cases, the main control component of the last operation is in the shutdown state when the multi-unit refrigeration system is started, such as during regular maintenance or a fault, then any one of the control components in the startup state serves as the previous main control component.

[0054] When the multi-unit refrigeration system is started for the first time, the control component with the largest or smallest default number is used as the main control component. After the first startup, it is determined according to the predetermined control rules whether to replace the next control component as the main control component, such as when the working hours are greater than or equal to 48 hours, etc. In some cases, when the load of the multi-unit refrigeration system is small, not all heat exchange units are turned on, or some heat exchange units are in a faulty or periodic maintenance state, and at this time, they cannot be used as the main control component candidates for rotation.

[0055] Determining the main control component according to the predetermined control rules, such as the rotation time and rotation conditions, etc., can make different control components operate periodically, avoid damage and reduce the service life caused by overusing a single control component, and at the same time can also give full play to the value of multiple control components.

[0056] S200. Obtain the system target temperature of the multi-unit refrigeration system, and control the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature.

[0057] It can be understood that after determining the main control component, the main control component obtains the system target temperature of the multi-unit refrigeration system, and then controls the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature. The working mode includes whether to operate, the target refrigerant flow rate of the heat exchange system in the operating state, and the target refrigerant outlet temperature of the corresponding heat exchange unit, etc.

[0058] According to the above, when the multi-unit refrigeration system is in operation, the previous main control component first detects the operating status of the control components of the multiple heat exchanger units, and then determines one of them as the current main control component according to the predetermined control rules. Secondly, the control component determined as the current main control component controls the operation of the multi-unit refrigeration system for the next period of time. The multi-unit refrigeration system does not require an external centralized control system. Multiple heat exchanger units communicate through a network protocol, and no additional centralized control system is required, which reduces additional equipment costs and maintenance costs. In addition, the heat exchanger units are controlled by their own control components, and the debugging matching is better. At the same time, the main control component can determine the corresponding working mode for different heat exchanger units, and each heat exchanger unit sets a different target refrigerant outflow temperature according to the actual capacity to meet the system target temperature and the optimal operation of the multi-unit refrigeration system.

[0059] In some embodiments, see Figure 2 The steps of controlling the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature specifically include:

[0060] S210. Determine the heat exchanger to be put into operation, the target refrigerant flow rate of the corresponding heat exchanger, and the target refrigerant outflow temperature of the corresponding heat exchanger according to the system target temperature and the pre-acquired allocation relationship.

[0061] It is understandable that the control component of the multi-unit refrigeration system has a control program pre-stored in it, and the control program has a distribution relationship pre-stored in it. For example, when the heat exchange load is large, all the heat exchange units are turned on, and each unit is in a high load state; when the heat exchange load is small, all the heat exchange units are turned on, and each unit is in the optimal working condition; or the number of heat exchange units turned on is calculated according to the heat exchange load, and the number of heat exchange units to be turned on and the load level of each heat exchange unit are determined. It should be noted that the startup state of the control component is different from the working state. When it is in the startup state, it means that the control component can work normally and can accept work instructions to run. When it is in the working state, it means that the work instruction has been received and it is in the cooling or heating process.

[0062] It should be noted that the heat exchange load in the embodiment of the present invention includes a cooling load and a heating load.

[0063] S220, sending signals to the corresponding heat exchange units to operate at the target refrigerant flow rate and the target refrigerant outflow temperature.

[0064] It can be understood that according to the distribution relationship and the heat exchange load, the number of the heat exchange unit to enter the working state, the target refrigerant flow rate of the heat exchange unit corresponding to the number, and the target refrigerant outlet temperature of the heat exchange unit corresponding to the number can be determined. By sending signals to the heat exchange units corresponding to the numbers to operate at the target refrigerant flow rate and the target refrigerant outlet temperature through the main control component, different target refrigerant outlet temperatures can be set according to the actual capacity of the heat exchange units to meet the system target temperature and the optimal operation of the multi-unit refrigeration system.

[0065] In some embodiments, after the step of controlling the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature, it further includes:

[0066] After the first preset duration, obtain the actual refrigerant outlet temperature of the multi-unit refrigeration system, the refrigerant outlet temperature and the load level of each heat exchange unit in the working state.

[0067] Control the operation of the heat exchange units in the working state respectively according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship.

[0068] It can be understood that the control method of the multi-unit refrigeration system provided by the embodiments of the present invention performs targeted control on all heat exchange units through the control component of any one heat exchange unit, sets different target refrigerant outlet temperatures according to the actual capacity of the heat exchange units to meet the system target temperature and the optimal operation of the multi-unit refrigeration system. The actual refrigerant outlet temperature T=(T1*L1 + T2*L2 + T3*L3 + …… + Tn*Ln) / (L1 + L2 + L3 + …… + Ln), then make the actual refrigerant outlet temperature T = the system target temperature T during the control stage. 0 . During the actual use process, due to the influence of the environment, the situation where the system target temperature T 0 is not equal to the actual refrigerant outlet temperature T may occur. Then, after the first preset duration, obtain the actual refrigerant outlet temperature of the multi-unit refrigeration system, the refrigerant outlet temperature and the load level of each heat exchange unit in the working state, and regulate the heat exchange units according to the detected results, adjust the refrigerant outlet temperature and the corresponding refrigerant flow rate of some heat exchange units, which can make the actual refrigerant outlet temperature T approach the system target temperature T 0 . Furthermore, the target heat exchange requirement can be realized. At the same time, according to the high and low load levels of different heat exchange units, the working states of the heat exchange units can be adjusted in sequence, which can make the load levels between different units more uniform, avoid some units being in a high-load wear state while the rest of the units are idle, improve the overall utilization efficiency of the multi-unit refrigeration system, and also extend the service life of the heat exchange units.

[0069] In some embodiments, the steps of controlling the operation of the heat exchange units in the working state according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-acquired load balance relationship specifically include:

[0070] When the actual refrigerant outlet temperature is higher than the first temperature, the heat exchange units with refrigerant outlet temperatures higher than the first temperature are sorted according to the load level from low to high, where the first temperature is equal to the sum of the system target temperature and the preset target temperature deviation value.

[0071] According to the load level from low to high, the refrigerant outlet temperature of the corresponding heat exchange unit is sequentially controlled to the system target temperature or the corresponding heat exchange unit is sequentially controlled to the full-load state.

[0072] It can be understood that the system target temperature is the set temperature. The refrigerant outlet temperature of the multi-unit refrigeration system can meet the heat exchange requirements only when it reaches the system target temperature. However, the refrigerant outlet temperature of the multi-unit refrigeration system is not constant and will be affected by the ambient temperature. Therefore, it will fluctuate around the system target temperature. The first temperature is equal to the sum of the system target temperature and the target temperature deviation value, and the second temperature is equal to the difference between the system target temperature and the target temperature deviation value. When the refrigerant outlet temperature of the multi-unit refrigeration system is between the first temperature and the second temperature, it is still considered that the use requirements can be met, and there is no need to frequently adjust the control parameters of the heat exchange unit, which improves the service life of components such as valves and fans in the system.

[0073] When the actual refrigerant outlet temperature is higher than the first temperature, the heat exchange units with refrigerant outlet temperatures higher than the first temperature are sorted according to the load level from low to high.

[0074] In the first case, the refrigerant outlet temperature of the corresponding heat exchange unit can be sequentially controlled to the system target temperature according to the load level from low to high, increasing the load of the heat exchange unit with a lower load level and reducing its refrigerant outlet temperature to the system target temperature, thereby increasing the cooling capacity of the system and making the actual refrigerant outlet temperature approach the system target temperature. After the adjustment of the heat exchange unit with the lowest load level is completed, if the actual refrigerant outlet temperature is still greater than the first temperature, then continue to adjust the refrigerant outlet temperature of the heat exchange unit with the second lowest load level, and so on until the actual refrigerant outlet temperature is less than or equal to the first temperature.

[0075] In the second case, the loads of the corresponding heat exchange units can be controlled in sequence from low to high load levels to reach the full-load state, increasing the load of the heat exchange unit with a lower load level, reducing its refrigerant outlet temperature, and making the actual refrigerant outlet temperature approach the system target temperature. After the heat exchange unit with the lowest load level is adjusted, if the actual refrigerant outlet temperature is still greater than the first temperature, continue to adjust the load of the heat exchange unit with the second-lowest load level, and so on until the actual refrigerant outlet temperature is less than or equal to the first temperature.

[0076] According to an embodiment of the present invention, after the step of controlling the refrigerant outlet temperature of the corresponding heat exchange unit to the system target temperature or controlling the corresponding heat exchange unit to the full-load state in sequence according to the load level from low to high, it further includes:

[0077] After the second preset time period, obtain the actual refrigerant outlet temperature of the multi-unit refrigeration system, the refrigerant outlet temperature of each heat exchange unit in the working state, and the load level.

[0078] When the actual refrigerant outlet temperature is higher than the first temperature, control the refrigerant outlet temperature of the corresponding heat exchange unit to the equilibrium temperature in sequence according to the load level from low to high; wherein, the equilibrium temperature is equal to the difference between the system target temperature and the target temperature adjustment gradient value.

[0079] It can be understood that after all the heat exchange units are adjusted, if the actual refrigerant outlet temperature is still higher than the first temperature, then control the refrigerant outlet temperature of the corresponding heat exchange unit to the equilibrium temperature in sequence according to the load level from low to high, reducing the refrigerant outlet temperature of the heat exchange unit by one gradient, which can cause the actual refrigerant outlet temperature to drop synchronously. Similarly, after the heat exchange unit with the lowest load level is adjusted and the effect is still not achieved, then adjust the refrigerant outlet temperature of the heat exchange unit with the second-lowest load level to drop by one gradient, and so on.

[0080] For the multi-unit refrigeration system adjusted according to the above method, the load levels of each heat exchange unit are relatively uniform and are related to the heat exchange capacity of each unit itself.

[0081] According to an embodiment of the present invention, the step of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship specifically includes:

[0082] When the actual refrigerant outlet temperature is less than the second temperature, sort the multiple heat exchange units according to the load level from high to low, where the second temperature is equal to the difference between the system target temperature and the preset target temperature deviation value.

[0083] Send signals to the corresponding heat exchange units to adjust to the optimal working condition in sequence according to the load level from high to low.

[0084] It can be understood that when the actual refrigerant outlet temperature is less than the second temperature, it indicates that the power of the multi-unit refrigeration system is too high and the heat exchange efficiency of some parts needs to be reduced. Signals for adjusting to the optimal working condition are sent to the corresponding heat exchange units in sequence from high to low according to the load level. First, the heat exchange unit with a high load level is adjusted to the optimal working condition, reducing the wear of this heat exchange unit and increasing its service life; then the load levels of other heat exchange units are adjusted in sequence.

[0085] In some embodiments, the steps of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship specifically include:

[0086] When the actual refrigerant outlet temperature is less than the second temperature, the multiple heat exchange units are sorted according to the load level from high to low, where the second temperature is equal to the difference between the system target temperature and the preset target temperature deviation value.

[0087] Signals for adjusting the target refrigerant outlet temperature to be greater than or equal to the second temperature are sent to the corresponding heat exchange units in sequence from high to low according to the load level.

[0088] It can be understood that when the actual refrigerant outlet temperature is less than the second temperature, it indicates that the power of the multi-unit refrigeration system is too high and the heat exchange efficiency of some parts needs to be reduced. Therefore, according to the load level from high to low, first reduce the load of the heat exchange unit with the highest load level, so that the refrigerant outlet temperature emitted by the heat exchange unit is adjusted to be greater than or equal to the second temperature. At this time, the actual refrigerant outlet temperature of the multi-unit refrigeration system can be gradually increased.

[0089] In some embodiments, after the steps of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship, it further includes:

[0090] After the third preset time period, the actual refrigerant outlet temperature of the multi-unit refrigeration system is obtained.

[0091] When the actual refrigerant outlet temperature is less than the second temperature, a shutdown signal is sent.

[0092] It can be understood that when the actual refrigerant outlet temperature of the multi-unit refrigeration system still cannot be increased after reducing the load level of the heat exchange unit, at this time, the heat production on the load side is less and the refrigerant temperature from the total return water pipeline is lower, and heat exchange is not required again. Shutdown measures can be taken to provide cold energy for the total outlet water pipeline through natural cooling, which can save energy.

[0093] The control device of the multi-unit refrigeration system according to the embodiment of the second aspect of the present invention, please refer to Figure 3 , including:

[0094] An acquisition module 301, configured to receive a setting signal sent by a previous master control component as the current master control component, and adjust to be the master control component according to the setting signal, where the current master control component is one of the control components determined by the previous master control component according to the operating states of the control components of the multi-unit refrigeration system and a predetermined control rule, and the previous master control component includes the master control component that was in the startup state during the last operation when the multi-unit refrigeration system was started, or any one of the control components that is in the startup state when the last-operated master control component is in the shutdown state.

[0095] A control module 302, configured to obtain the system target temperature of the multi-unit refrigeration system, and control the working modes of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature.

[0096] It should be noted that the above steps S100 to step S200, as well as other steps, are only for convenience of description and do not constitute a timing limitation on the steps in the control method of the multi-unit refrigeration system. And some content is described in detail in the control method of the multi-unit refrigeration system provided in the embodiment of the first aspect, and all the content in the control method of the multi-unit refrigeration system is also applicable to the control device of the multi-unit refrigeration system provided in the embodiment of the second aspect, so as to avoid repeated description and not expand in detail in the control device of the multi-unit refrigeration system provided in the embodiment of the second aspect. Similarly, the content in the above two aspects of the embodiments can be used to explain the content of all the subsequent aspects of the embodiments, so the repeated content in the subsequent embodiments will not be described in detail. According to the control device of the multi-unit refrigeration system provided in the embodiment of the present invention, its technical effects correspond to the technical effects of the above control method of the multi-unit refrigeration system, and will not be elaborated here.

[0097] The multi-unit refrigeration system according to the embodiment of the third aspect of the present invention includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the steps of the control method of the multi-unit refrigeration system provided in the embodiment of the first aspect of the present invention.

[0098] Figure 4The schematic diagram of the physical structure of an electronic device is exemplified. The electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communications interface 820, and the memory 830 complete communication with each other through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the multi-unit refrigeration system. The method includes: receiving the setting signal sent by the previous master control component as the current master control component, and adjusting to be the master control component according to the setting signal. Among them, the current master control component is one of the control components determined by the previous master control component according to the operating states of the control components of the multi-unit refrigeration system and a predetermined control rule. The previous master control component includes the master control component that was in the startup state during the previous operation when the multi-unit refrigeration system was started, or any one of the control components that was in the startup state when the previous master control component was in the shutdown state; obtaining the system target temperature of the multi-unit refrigeration system, and controlling the working mode of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature.

[0099] In addition, when the logical instructions in the above-mentioned memory 830 can be implemented in the form of software functional units and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0100] The device embodiments described above are merely illustrative. 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 may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0101] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment 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 such an understanding, the above technical solution, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing 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.

[0102] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for a multi-unit refrigeration system, characterized in that, the multi-unit refrigeration system includes a plurality of heat exchange units, and each of the heat exchange units includes a control component, and the control method includes: receiving a setting signal sent by a previous master control component as the current master control component, and adjusting to be the master control component according to the setting signal, wherein the current master control component is one of the control components determined by the previous master control component according to the operating states of the control components of the multi-unit refrigeration system and a predetermined control rule, and the previous master control component includes the master control component that was in the startup state during the last operation when the multi-unit refrigeration system was started, or any one of the control components that is in the startup state when the last-operated master control component is in the shutdown state; acquiring the system target temperature of the multi-unit refrigeration system, and controlling the working modes of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature.

2. The control method for a multi-unit refrigeration system according to claim 1, characterized in that, the step of controlling the working modes of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature includes: determining the heat exchange units to enter the working state, the target refrigerant flow rate corresponding to the heat exchange units, and the target refrigerant outlet temperature corresponding to the heat exchange units according to the system target temperature and a pre-acquired distribution relationship; respectively sending signals to the corresponding heat exchange units to operate at the target refrigerant flow rate and the target refrigerant outlet temperature.

3. The control method for a multi-unit refrigeration system according to claim 2, characterized in that, after the step of controlling the working modes of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature, the method further includes: after a first preset time period, acquiring the actual refrigerant outlet temperature of the multi-unit refrigeration system, the refrigerant outlet temperature and the load level of each heat exchange unit in the working state; controlling the operation of the heat exchange units in the working state respectively according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and a pre-acquired load balance relationship.

4. The control method for a multi-unit refrigeration system according to claim 3, characterized in that, the step of controlling the operation of the heat exchange units in the working state respectively according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and a pre-acquired load balance relationship includes: when the actual refrigerant outlet temperature is higher than a first temperature, sorting the heat exchange units with the refrigerant outlet temperature higher than the first temperature according to the load level from low to high, wherein the first temperature is equal to the sum of the system target temperature and a preset target temperature deviation value; controlling the refrigerant outlet temperature of the corresponding heat exchange units to the system target temperature in sequence according to the load level from low to high or controlling the corresponding heat exchange units to the full-load state in sequence.

5. The control method of the multi-unit refrigeration system according to claim 4, wherein, after the step of sequentially controlling the refrigerant outlet temperature of the corresponding heat exchange unit to the system target temperature or sequentially controlling the corresponding heat exchange unit to the full-load state according to the load level from low to high, the method further includes: After a second preset time period, obtaining the actual refrigerant outlet temperature of the multi-unit refrigeration system, the refrigerant outlet temperature of each heat exchange unit in the working state, and the load level; When the actual refrigerant outlet temperature is higher than the first temperature, sequentially controlling the refrigerant outlet temperature of the corresponding heat exchange unit to the balance temperature according to the load level from low to high; wherein, the balance temperature is equal to the difference between the system target temperature and the preset target temperature adjustment gradient value.

6. The control method of the multi-unit refrigeration system according to claim 3, wherein, the step of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship includes: When the actual refrigerant outlet temperature is less than the second temperature, sorting the multiple heat exchange units according to the load level from high to low, wherein the second temperature is equal to the difference between the system target temperature and the preset target temperature deviation value; Sequentially sending signals to the corresponding heat exchange units to adjust to the optimal working condition according to the load level from high to low.

7. The control method of the multi-unit refrigeration system according to claim 3, wherein, the step of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship includes: When the actual refrigerant outlet temperature is less than the second temperature, sorting the multiple heat exchange units according to the load level from high to low, wherein the second temperature is equal to the difference between the system target temperature and the preset target temperature deviation value; Sequentially sending signals to the corresponding heat exchange units to adjust the target refrigerant outlet temperature to be greater than or equal to the second temperature according to the load level from high to low.

8. The control method of the multi-unit refrigeration system according to claim 6 or 7, wherein, after the step of respectively controlling the operation of the heat exchange units in the working state according to the actual refrigerant outlet temperature, the refrigerant outlet temperature of each heat exchange unit, the load level of each heat exchange unit, and the pre-obtained load balance relationship, the method further includes: After a third preset time period, obtaining the actual refrigerant outlet temperature of the multi-unit refrigeration system; When the actual refrigerant outlet temperature is less than the second temperature, sending a shutdown signal.

9. A control device for a multi-unit refrigeration system, wherein, comprising: A receiving module, configured to receive a setting signal sent by a previous main control component as the current main control component, and adjust to be set as the main control component according to the setting signal, where the current main control component is one of the control components determined by the previous main control component according to the operating states of the control components of the multi-unit refrigeration system and a predetermined control rule, and the previous main control component includes the main control component that was in the startup state during the last operation when the multi-unit refrigeration system was started, or any one of the control components that is in the startup state when the previous main control component in the last operation is in the shutdown state; An obtaining module, configured to obtain the system target temperature of the multi-unit refrigeration system, and control the working modes of each heat exchange unit of the multi-unit refrigeration system according to the system target temperature.

10. A multi-unit refrigeration system, including a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that when the processor executes the program, the steps of the control method of the multi-unit refrigeration system according to any one of claims 1 to 8 are implemented.

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