Control method, control unit and refrigerating system

Abstract

The invention provides a control method, a control device and a refrigerating system. The control unit of the refrigerating system is electrically connected with the refrigerating unit through the dry contacts, so that the communication state of the refrigerating unit can be detected through the dry contacts. At least one refrigeration unit in normal communication can be sequenced based on the loss accumulation information of the refrigeration unit to obtain a first sequence; at least one refrigeration unit with abnormal communication can be sequenced based on the physical address of the refrigeration unit to obtain a second sequence; and then based on the first sequence and the second sequence, the multiple refrigeration units are controlled to be started. Namely, even if the communication is affected, the communication state of each refrigeration unit can be detected through the dry contact, and different sequences can be set based on the communication state, so that the refrigeration units in different states can be controlled to be started more accurately, the refrigeration requirement is better met, and the use experience of a user is met.

Description

Technical Field

[0001] The present disclosure relates to the field of refrigeration technology, and in particular to a control method, a control unit and a refrigeration system. Background Art

[0002] With the rapid development of modern industry, refrigeration systems have been widely used in many fields, and traditional modular refrigeration systems have become a common solution for many large-scale refrigeration needs. Traditional modular refrigeration systems mainly include key components such as control units, refrigeration units and liquid supply units.

[0003] The control unit plays the role of the core brain in the entire system. It is responsible for making complex logic operations and decisions on opening, closing and frequency modulation according to the system's operating requirements and the real-time status of each module. In a normal operating environment, it accurately controls and dispatches the refrigeration unit and the liquid supply module through communication to ensure that the entire refrigeration system can operate efficiently and stably, meeting the precise temperature control in industrial production processes and the refrigeration and freezing needs of commercial places.

[0004] However, in some special application scenarios, such as in environments with strong electromagnetic interference, this traditional modular refrigeration system that relies on communication for control and scheduling has exposed serious limitations. Strong electromagnetic interference may come from large-scale power equipment, high-frequency communication base stations, or complex industrial electromagnetic environments in the surrounding area. In such a harsh electromagnetic environment, communication signals are easily interfered with, which affects the control of the refrigeration unit and makes it impossible to meet the refrigeration needs. Summary of the invention

[0005] In view of this, in order to solve the technical problem in the prior art that the communication signal is interfered with and affects the control of the refrigeration unit, thereby failing to meet the refrigeration demand, the present disclosure provides a control method, a control unit and a refrigeration system.

[0006] According to a first aspect of an embodiment of the present disclosure, a control method is provided, which is applied to a refrigeration system, wherein the refrigeration system includes a control unit and a plurality of refrigeration units, wherein the refrigeration units are electrically connected to the control unit via dry contacts, and the control method includes:

[0007] For N refrigeration units without startup failure, the communication status of the N refrigeration units is detected based on dry contacts; wherein N is an integer greater than or equal to 1, and the communication status includes normal communication and abnormal communication;

[0008] For the M refrigeration units with normal communication, sort them based on the accumulated loss information of the refrigeration units to obtain a first sequence; wherein M is an integer greater than or equal to 0 and less than or equal to N;

[0009] For the NM refrigeration units with abnormal communication, sort them based on the physical addresses of the refrigeration units to obtain a second sequence;

[0010] Based on the first sequence and the second sequence, the opening of the N refrigeration units is controlled by dry contacts.

[0011] In an alternative embodiment,

[0012] The step of sorting based on the accumulated loss information of the refrigeration units to obtain a first sequence includes:

[0013] Determine the M accumulated loss information of the M refrigeration units with normal communication; wherein the M accumulated loss information corresponds one-to-one to the M refrigeration units;

[0014] Based on the ascending order of the M pieces of loss accumulation information, the corresponding M refrigeration units are sorted to obtain the first sequence.

[0015] In an alternative embodiment,

[0016] The M accumulated loss information of the M refrigeration units that are determined to have normal communication includes:

[0017] The operation frequency and the operation time of the refrigeration unit are accumulated to determine the accumulated loss information corresponding to the refrigeration unit.

[0018] In an alternative embodiment,

[0019] The method of controlling the opening of the N refrigeration units through dry contacts based on the first sequence and the second sequence includes:

[0020] Based on the order of the refrigeration units in the first sequence, controlling the refrigeration units in the first sequence to be turned on one by one through dry contacts;

[0021] After all the refrigeration units in the first sequence are turned on, based on the order of the refrigeration units in the second sequence, the refrigeration units in the first sequence are controlled to be turned on one by one through dry contacts.

[0022] In an alternative embodiment,

[0023] After controlling the opening of the plurality of refrigeration units based on the first sequence and the second sequence, the control method includes:

[0024] For the M refrigeration units with normal communication, when the M refrigeration units are in an autonomous frequency modulation control state, the M current operating frequencies of the M refrigeration units are detected once at a first time interval; wherein the M current operating frequencies correspond one to one with the M refrigeration units;

[0025] Determining an average operating frequency of the M refrigeration units based on the M current operating frequencies;

[0026] The average operating frequency is transmitted to the M refrigeration units, so that the refrigeration units gradually adjust their operating frequencies to the average operating frequency with a set frequency adjustment gradient and a second time interval, and then enter the autonomous frequency modulation control state.

[0027] In an alternative embodiment,

[0028] The control method comprises:

[0029] A plurality of startup failures of the refrigeration units are detected by dry contacts.

[0030] According to a second aspect of an embodiment of the present disclosure, a control unit is provided, the control unit comprising a detection module, a sorting module and a control module, wherein:

[0031] The detection module is used to detect the communication status of the N refrigeration units without startup failure based on dry contacts; wherein the communication status includes normal communication and abnormal communication;

[0032] The sorting module is used to sort the M refrigeration units with normal communication based on the accumulated loss information of the refrigeration units to obtain a first sequence; and is also used to sort the NM refrigeration units with abnormal communication based on the physical addresses of the refrigeration units to obtain a second sequence;

[0033] The control module is used to control the start-up sequence of the N refrigeration units based on the first sequence and the second sequence.

[0034] According to a third aspect of an embodiment of the present disclosure, a refrigeration system is provided, comprising a plurality of refrigeration units and a control unit as described in the second aspect, wherein the refrigeration units are electrically connected to the control unit via dry contacts.

[0035] In an alternative embodiment,

[0036] The refrigeration unit has an autonomous frequency modulation control state, wherein NM refrigeration units with abnormal communication are in the autonomous frequency modulation control state, and the refrigeration unit is in the autonomous frequency modulation control state:

[0037] The refrigeration unit adjusts the operating frequency of the refrigeration unit based on the liquid inlet temperature, the liquid outlet temperature and the target temperature; wherein the target temperature is the set temperature received when the refrigeration unit is in normal communication;

[0038] and / or,

[0039] After the refrigeration unit operates at the set operating frequency for a third time interval, the operating frequency of the refrigeration unit is adjusted to decrease by a set amplitude.

[0040] In an alternative embodiment,

[0041] The control unit includes a centralized control touch screen, a centralized control main board and a liquid supply unit main board. The refrigeration system also includes a communication gateway. The centralized control touch screen, the centralized control main board and the liquid supply unit main board are electrically connected to the communication gateway through a first communication bus. The multiple refrigeration units are electrically connected to the communication gateway through a second communication bus to achieve communication between the control unit and the multiple refrigeration units.

[0042] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: In the present disclosure, the control unit of the refrigeration system is electrically connected to the refrigeration unit through dry contacts, so that the communication status of the refrigeration unit can be detected through the dry contacts. For at least one refrigeration unit with normal communication, it can be sorted based on the accumulated loss information of the refrigeration unit to obtain a first sequence; for at least one refrigeration unit with abnormal communication, it can be sorted based on the physical address of the refrigeration unit to obtain a second sequence; then based on the first sequence and the second sequence, the opening of multiple refrigeration units is controlled. That is, even if the communication of the present disclosure is affected, the communication status of each refrigeration unit can be detected through dry contacts, and different sequences can be set based on the communication status, so as to more accurately control the opening of refrigeration units in different states, so as to better meet the refrigeration needs and meet the user experience.

[0043] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0046] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0047] Figure 1 It is a flowchart of a control method according to an exemplary embodiment.

[0048] Figure 2 is a flowchart of a control method according to another exemplary embodiment.

[0049] Figure 3 is a block diagram of a control unit according to an exemplary embodiment.

[0050] Figure 4 is a schematic diagram showing the communication principle of a refrigeration system according to another exemplary embodiment.

[0051] Figure 5 The diagram is a schematic diagram of electrical connection between a centralized control mainboard and a refrigeration unit of a refrigeration system according to an exemplary embodiment. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0053] The disclosure below provides many different embodiments or examples to implement different schemes of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0054] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0055] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0056] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0057] In order to solve the technical problem in the prior art that the communication signal is interfered with and affects the control of the refrigeration unit, thereby failing to meet the refrigeration demand, the present disclosure provides a control method, a control unit and a refrigeration system.

[0058] Among them, in the present disclosure, the control unit of the refrigeration system is electrically connected to the refrigeration unit through a dry contact, so that the communication status of the refrigeration unit can be detected through the dry contact. For at least one refrigeration unit with normal communication, it can be sorted based on the accumulated loss information of the refrigeration unit to obtain a first sequence; for at least one refrigeration unit with abnormal communication, it can be sorted based on the physical address of the refrigeration unit to obtain a second sequence; then based on the first sequence and the second sequence, the opening of multiple refrigeration units is controlled. That is, even if the communication of the present disclosure is affected, the communication status of each refrigeration unit can be detected through a dry contact, and different sequences can be set based on the communication status, so as to more accurately control the opening of refrigeration units in different states, so as to better meet the refrigeration needs and meet the user experience.

[0059] In an exemplary embodiment, a control method is provided, which is applied to a refrigeration system. The refrigeration system may include a control unit and a plurality of refrigeration units, wherein the refrigeration units are electrically connected to the control unit via dry contacts, wherein a reference Figure 1 , Figure 4 and Figure 5 As shown, the control method may include:

[0060] S110, for N refrigeration units without startup failure, detecting the communication status of the N refrigeration units; wherein N is an integer greater than or equal to 1, and the communication status includes normal communication and abnormal communication;

[0061] S120, sorting the M refrigeration units with normal communication based on the accumulated loss information of the refrigeration units to obtain a first sequence;

[0062] S130, sorting the NM refrigeration units with abnormal communication based on the physical addresses of the refrigeration units to obtain a second sequence;

[0063] S140. Based on the first sequence and the second sequence, control the opening of multiple refrigeration units through dry contacts.

[0064] In step S110, before the power-on control of the multiple refrigeration units is performed, the power-on failure and communication status of the multiple refrigeration units can be detected through the dry contact. For the refrigeration units with power-on failure, they can be eliminated, and the control unit no longer controls them to start. For the refrigeration units without power-on failure, the communication status of the refrigeration units can be judged based on the information fed back by the dry contact to distinguish between the refrigeration units with normal communication and the refrigeration units with abnormal communication.

[0065] It should be noted that the dry contact, as a simple mechanical electrical connection element, plays the role of signal transmission between the refrigeration unit and the control unit. During the normal startup process, the circuit and mechanical device inside the refrigeration unit will cause the dry contact to change state (such as from open to closed) at a specific moment, thereby sending a startup signal to the control unit. For example, when the power switch of the refrigeration unit is pressed, the internal control circuit closes the dry contact, which is equivalent to sending a "I have turned on" signal to the control unit.

[0066] Before the refrigeration system is started, the control unit may send a specific initial detection signal to each refrigeration unit. This signal may be a short low-voltage pulse or other predefined electrical signal form. The purpose of sending the detection signal is to activate the power-on self-test program of the refrigeration unit. This detection signal is only used to activate the power-on self-test program inside the refrigeration unit and does not have the function of controlling the power-on. If no feedback signal is received from a refrigeration unit within the specified time, the control unit determines that the refrigeration unit may have a power-on failure and records the relevant information.

[0067] For each refrigeration unit, the control unit detects its power-on status through the dry contact. The dry contact of each refrigeration unit will change state at a specific moment when the power-on is normal (for example, from open to closed). When the control unit detects that the state of the dry contact meets the set change of normal power-on, it is determined that the refrigeration unit has no power-on failure; conversely, if the dry contact state does not change correctly within the expected time, it is determined that there is a power-on failure.

[0068] In addition to dry contact status detection, the control unit can also combine other auxiliary means to further confirm the startup failure, which is not limited. For example, by detecting the voltage and current of the connection line between the refrigeration unit and the control unit, it is determined whether there is a line break or short circuit fault. If there is no current change or voltage abnormality on the connection line after sending the detection signal, it can also assist in determining that there is a startup problem with the refrigeration unit. In addition, some refrigeration units may be equipped with self-test indicator lights or other status feedback devices, and the control unit can also comprehensively determine whether the refrigeration unit has been successfully started by reading the status information of these devices.

[0069] In addition, the control unit can detect communication failures by regularly scanning the voltage status of the dry contacts. If the voltage of the dry contacts changes abnormally (such as frequent high and low level jumps, being at a high level for a long time to indicate a disconnected state, etc.), it is determined to be a communication failure. In addition, time factors are also considered. For example, if the state of the dry contacts does not change according to the normal communication logic within a certain period of time, it will also be determined as a communication failure. For example, in several consecutive tests (each with a certain interval of time, such as 5 seconds), the dry contacts are always in a disconnected state, while under normal circumstances they should be in a closed state for communication, which indicates that a communication failure has occurred.

[0070] It should be noted that, in addition to detecting the communication status in the above manner, the communication status may also be detected in other manners, which are not limited thereto.

[0071] In step S120, for the M refrigeration units with normal communication detected in step S110, it means that the control unit can normally control the above refrigeration units. In this case, the control unit can determine the M loss accumulation information of the above M refrigeration units. The M loss accumulation information corresponds to the M refrigeration units one by one. That is, the loss accumulation information of each refrigeration unit is determined. Then, the corresponding M refrigeration units can be sorted based on the order of the determined M loss accumulation information from small to large, so as to obtain a first sequence.

[0072] For example, if it is detected that there are three refrigeration units with normal communication, and the accumulated loss information of the first refrigeration unit a is determined to be F1, the accumulated loss information of the second refrigeration unit b is F2, and the accumulated loss information of the third refrigeration unit c is F3. If F1 is less than F3, and F2 is less than F1, then the first sequence can be determined to be refrigeration unit b, refrigeration unit a, and refrigeration unit c.

[0073] When determining the accumulated loss information of the refrigeration unit, the operating frequency and operating time of the refrigeration unit may be first obtained, and then the operating frequency and operating time of the refrigeration unit may be accumulated to determine the accumulated loss information corresponding to the refrigeration unit. For example, the accumulated loss information F=F=∫f(t)dt, where t represents the operating time and f represents the operating frequency.

[0074] The refrigeration unit may include a compressor and a fan. In this embodiment, when determining the first sequence, the refrigeration units to which the compressors belong may be sorted based on the accumulated loss information of the compressors.

[0075] Of course, the cumulative operating frequency of the refrigeration unit can also be divided into the cumulative operating frequency of the compressor and the cumulative operating frequency of the fan, the cumulative operating time of the refrigeration unit can be divided into the cumulative operating time of the compressor and the cumulative operating time of the fan, and the cumulative loss information of the refrigeration unit can be the sum of the cumulative loss information of the compressor and the cumulative loss information of the fan, or the larger value of the cumulative loss information of the compressor and the cumulative loss information of the fan, and there is no limitation on this.

[0076] It should be noted that, in addition to determining the accumulated loss information of the refrigeration unit in the above manner, the accumulated loss information may also be determined in other ways. For example, the accumulated loss information may be determined directly based on the accumulated operating time. Of course, the sorting may also be performed directly based on the accumulated operating time, and this is not limited.

[0077] In step S130, for the NM refrigeration units with communication abnormalities detected in step S110, it means that the control unit cannot control the above refrigeration units normally. In this case, the control unit can sort the corresponding NM refrigeration units based on the physical addresses of the above NM refrigeration units to obtain a second sequence.

[0078] It should be noted that each refrigeration unit may be configured with a unique physical address, and there may be a certain order between the physical addresses. In this embodiment, for NM refrigeration units with abnormal communication, the second sequence may be determined based on the order of their physical addresses.

[0079] In some embodiments,

[0080] For refrigeration units that are judged to have abnormal communication, the control unit will extract the physical address information of these abnormal units from the refrigeration unit information database stored internally. Since there is a pre-set sequence between physical addresses, the control unit can directly use this sequence information for sorting. Assume that there are 5 refrigeration units with abnormal communication, and their physical addresses are 0203, 0301, 0105, 0402, and 0504 respectively.

[0081] The control unit uses a simple digital comparison algorithm to sort the physical addresses. For example, the physical addresses can be arranged from small to large based on the size of the numbers (here it is assumed that the physical address is a pure digital code. If it contains other information such as letters, it can be converted into a comparable form according to the pre-set coding rules). In the above example, the sorted order is: 0105, 0203, 0301, 0402, 0504. This order is the so-called second sequence. The control unit stores the generated second sequence in a special temporary processing sequence storage area so that when these abnormal communication refrigeration units need to be operated later (such as trying to reconnect, troubleshooting sequence arrangement, etc.), they can be processed in this order in sequence to improve the systematicness and efficiency of the processing.

[0082] It should be noted that the physical address may be other than the above contents, and there is no limitation on this. The physical address-based sorting may be other than the above methods, and there is no limitation on this.

[0083] In step S140, after the first sequence and the second sequence are obtained, the refrigeration units without startup failures can be controlled to start based on the first sequence and the second sequence. Among them, the refrigeration units in the first sequence can be controlled to start one by one through dry contacts based on the order of the refrigeration units in the first sequence. After all the refrigeration units in the first sequence are turned on, the refrigeration units in the first sequence are controlled to start one by one through dry contacts based on the order of the refrigeration units in the second sequence. In other words, before controlling the refrigeration units in the second sequence to start, it can be determined whether all the refrigeration units in the first sequence have completed starting. If it is determined that all the refrigeration units in the first sequence have completed starting, the refrigeration units in the second sequence are controlled to start. If it is determined that not all the refrigeration units in the first sequence have completed starting, wait until all the refrigeration units in the first sequence have completed starting before controlling the refrigeration units in the second sequence to start.

[0084] It should be noted that the reason why the refrigeration units in the first sequence are turned on first is that the refrigeration units in the first sequence are refrigeration units with normal communication, the control unit can communicate with them normally, and can adjust them in real time based on demand to better meet the needs of users. The reason why the refrigeration units with abnormal communication are still turned on later is to avoid insufficient cooling capacity, to better improve the cooling capacity of the entire refrigeration system, and to alleviate the cooling pressure of the refrigeration units in the first sequence, so as to better balance the losses of each refrigeration unit and extend the service life of the entire refrigeration system.

[0085] In addition, by first starting the first sequence of refrigeration units that have normal communication and are sorted according to the accumulated loss information, the refrigeration units in better condition can be used to provide refrigeration capacity first, reducing the risk of failure in the early stage of system startup. After all the refrigeration units in the first sequence are started, the second sequence of refrigeration units with abnormal communication are started. Even if some refrigeration units in the second sequence cannot be successfully started, it will not have a fatal impact on the basic refrigeration function of the entire system, thereby improving the success rate of system startup in complex environments.

[0086] Among them, based on the accumulated loss information, the refrigeration units with normal communication are started in order, so that the refrigeration units with less loss are given priority, which can more reasonably distribute the workload and extend the service life of each refrigeration unit in the entire refrigeration system. At the same time, in the case of abnormal communication, the refrigeration units are started according to the physical address sequence, and all refrigeration units can be managed in an orderly manner to avoid waste of resources and damage to the equipment caused by disorderly startup.

[0087] In this embodiment, even if the communication is affected, the communication status of each refrigeration unit can be detected through dry contacts, and different sequences can be set based on the communication status, so as to more accurately control the opening of refrigeration units in different states, so as to better meet the refrigeration needs and satisfy the user experience.

[0088] In an exemplary embodiment, a control method is provided, which is applied to a refrigeration system. In the control method, after controlling the opening of multiple refrigeration units based on a first sequence and a second sequence, the operation of the refrigeration units can be further controlled based on the communication status of the refrigeration units. That is, different operation control strategies are adopted based on different communication statuses.

[0089] Among them, reference Figure 2 , Figure 4 and Figure 5 As shown, for M refrigeration units with normal communication, the operation control strategy may include:

[0090] S210, when the M refrigeration units are in an autonomous frequency modulation control state, detecting the M current operating frequencies of the M refrigeration units once every first time interval; wherein the M current operating frequencies correspond one to one with the M refrigeration units;

[0091] S220, determining an average operating frequency of the M refrigeration units based on the M current operating frequencies;

[0092] S230, transmitting the average operating frequency to M refrigeration units, so that the refrigeration units gradually adjust their operating frequencies to the average operating frequency with the set frequency adjustment gradient and the second time interval, and then enter the autonomous frequency regulation control state.

[0093] In step S210, the autonomous frequency modulation control state may refer to a state in which the refrigeration unit autonomously adjusts its operating frequency. For example, the refrigeration unit may autonomously adjust the operating frequency of the compressor based on the inlet liquid temperature, outlet liquid temperature and target temperature of the compressor, and synchronously adjust the operating frequency of the fan, thereby realizing autonomous adjustment of the operating frequency of the refrigeration unit.

[0094] It should be noted that since the refrigeration unit has an independent frequency modulation operation control (i.e., autonomous frequency modulation control) state, and each refrigeration unit receives a different start-up instruction from the control unit at a different time, there will be inconsistent operating frequencies between the refrigeration units during operation.

[0095] For example, the first refrigeration unit a is turned on first, and the second refrigeration unit b is turned on 5 minutes after the first refrigeration unit a. Therefore, the compressor and fan of the first refrigeration unit a will run at a higher frequency, while the compressor and fan of the second refrigeration unit b will run at a lower frequency. This will cause the loss of the first refrigeration unit a (such as wear and tear of the compressor and fan) to be greater than the loss of the second refrigeration unit b, and the noise generated will also be greater.

[0096] Based on the above reasons, this step can be set to detect the M current operating frequencies of the M refrigeration units once every first time interval t1. The M current operating frequencies correspond to the M refrigeration units one by one. The current operating frequency may include the operating frequency of the compressor or the operating frequency of the fan, which is not limited. By detecting the current operating frequency of the refrigeration unit, the subsequent operation of each refrigeration unit can be controlled so that the loss and noise between the refrigeration units tend to be the same.

[0097] It should be noted that the first time interval can be set based on actual conditions, and its specific value is not limited.

[0098] In step S220, after the M current operating frequencies of the M refrigeration units are obtained, the average operating frequency of the M refrigeration units can be calculated based on the M current operating frequencies.

[0099] It should be noted that when the refrigeration unit includes compressors and fans, the average operating frequency of the M compressors can be determined based on the current operating frequencies of the M compressors, and the average operating frequency of the M fans can be determined based on the current operating frequencies of the M fans.

[0100] In step S230, a frequency adjustment gradient and a second time interval may be set in the refrigeration system. The frequency adjustment gradient and the second time interval may be set according to actual needs, and their specific values ​​are not limited.

[0101] After the control unit determines the average operating frequency of the refrigeration unit, it can send it to each refrigeration unit. After receiving the above average operating frequency, the refrigeration unit can set the frequency adjustment gradient and the second time interval, gradually adjust its operating frequency to the average operating frequency, and then enter the autonomous frequency modulation control state.

[0102] For example, the refrigeration unit may include a compressor and a fan, the average operating frequency of the compressor is recorded as f1, the average operating frequency of the fan is recorded as f2, the frequency adjustment gradient is set to x Hz, and the second time interval is t2. After the refrigeration unit obtains the above f1 and f2, it adjusts the operating frequency of the compressor and the fan by x Hz respectively every t2 time interval until the operating frequency of the compressor reaches f1 and the operating frequency of the fan reaches f2, and then enters the autonomous frequency modulation control state.

[0103] Among them, for the NM refrigeration units with abnormal communication, they can be in an autonomous frequency modulation control state. When the refrigeration unit is in the autonomous frequency modulation control state, the refrigeration unit can adjust the operating frequency of the refrigeration unit based on the inlet liquid temperature, the outlet liquid temperature and the target temperature; wherein the target temperature can be the set temperature received when the refrigeration unit is in normal communication. That is, the target temperature is the set temperature received from the control unit last time memorized in the refrigeration unit, so that the target temperature is more in line with the user's needs.

[0104] In addition, when the refrigeration unit is in the autonomous frequency modulation control state, after the refrigeration unit operates at the set operating frequency for the third time interval, the operating frequency of the refrigeration unit is adjusted to reduce the set amplitude. The set operating frequency, the third time interval and the set amplitude can be set based on actual conditions, and their specific values ​​may not be limited.

[0105] For example, a refrigeration unit may include a compressor and a fan, and the set operating frequency may include the maximum allowable operating frequency of the compressor and the maximum allowable operating frequency of the fan. The third time interval may be recorded as t3, and the set amplitude may be recorded as 20%. That is, when the refrigeration unit is in the state of autonomous frequency modulation control, if the duration of its compressor being at the maximum allowable operating frequency reaches t3, the operating frequency of the compressor may be reduced by 20%; if the trial production of its fan being at the maximum allowable operating frequency reaches t3, the operating frequency of the fan may be reduced by 20%. In this way, the compressor and fan in the refrigeration unit can be prevented from operating at a high frequency for a long time, and the refrigeration unit can be better protected.

[0106] It should be noted that, for the M refrigeration units with normal communication, when they are also in the autonomous frequency modulation control state, their control logic can refer to the refrigeration unit with abnormal communication, which will not be described in detail.

[0107] In this embodiment, by controlling the frequency modulation of the refrigeration unit by the control unit and the autonomous frequency modulation control state of the refrigeration unit, the precise control of the refrigeration unit can be well achieved, and the autonomous adjustment of the refrigeration unit with abnormal communication can be ensured. The entire refrigeration system can achieve balanced operation of the equipment under normal conditions, which can prevent damage to individual refrigeration units caused by long-term high-load operation, avoid abnormal wear caused by high-load operation of some equipment, and reduce the noise of the entire set of equipment. Moreover, even in the abnormal communication state, the refrigeration unit can avoid damage caused by long-term high-load operation based on autonomous frequency modulation control, avoid abnormal wear caused by high-load operation of some equipment, and reduce the noise of the entire set of equipment.

[0108] In an exemplary embodiment, a control unit is provided, which is applied to a refrigeration system. The control unit can be used to implement the above control method. Figure 3 As shown, the control unit may include a detection module 10 , a sorting module 20 and a control module 30 .

[0109] The detection module 10 is used to detect the communication status of the N refrigeration units without startup failures; wherein the communication status includes normal communication and abnormal communication;

[0110] The sorting module 20 is used to sort the M refrigeration units with normal communication based on the accumulated loss information of the refrigeration units to obtain a first sequence; and is also used to sort the NM refrigeration units with abnormal communication based on the physical addresses of the refrigeration units to obtain a second sequence;

[0111] The control module 30 is used to control the start of the N refrigeration units based on the first sequence and the second sequence.

[0112] In an exemplary embodiment, a control unit is provided, which is applied to a refrigeration system. The control unit can be used to implement the above control method. Figure 3 As shown, in the control unit, the sorting module 20 can be used to:

[0113] Determine M pieces of accumulated loss information of M refrigeration units with normal communication; wherein the M pieces of accumulated loss information correspond one to one with the M refrigeration units;

[0114] Based on the ascending order of the M loss accumulation information, the corresponding M refrigeration units are sorted to obtain a first sequence.

[0115] In an exemplary embodiment, a control unit is provided, which is applied to a refrigeration system. The control unit can be used to implement the above control method. Figure 3 As shown, in the control unit, the sorting module 20 can be used to:

[0116] The operation frequency and the operation time of the refrigeration unit are accumulated to determine the accumulated loss information corresponding to the refrigeration unit.

[0117] In an exemplary embodiment, a control unit is provided, which is applied to a refrigeration system. The control unit can be used to implement the above control method. Figure 3 As shown, in the control unit, the control module 30 can be used to:

[0118] Based on the order of the refrigeration units in the first sequence, the refrigeration units in the first sequence are controlled to be turned on one by one through dry contacts;

[0119] After all the refrigeration units in the first sequence are turned on, based on the order of the refrigeration units in the second sequence, the refrigeration units in the first sequence are controlled to be turned on one by one through dry contacts.

[0120] In an exemplary embodiment, a control unit is provided, which is applied to a refrigeration system. The control unit can be used to implement the above control method. Figure 3 As shown, in the control unit, the control module 30 can be used to:

[0121] After controlling the opening of the plurality of refrigeration units based on the first sequence and the second sequence, for the M refrigeration units with normal communication, when the M refrigeration units are in an autonomous frequency modulation control state, detecting the M current operating frequencies of the M refrigeration units once at a first time interval; wherein the M current operating frequencies correspond one to one with the M refrigeration units;

[0122] Determining an average operating frequency of the M refrigeration units based on the M current operating frequencies;

[0123] The average operating frequency is transmitted to the M refrigeration units, so that the refrigeration units gradually adjust their operating frequencies to the average operating frequency with the set frequency adjustment gradient and the second time interval, and then enter the autonomous frequency regulation control state.

[0124] In an exemplary embodiment, a control unit is provided, which is applied to a refrigeration system. The control unit can be used to implement the above control method. Figure 3 As shown, in the control unit, the detection module 10 can be used for:

[0125] Detects power-on failures of multiple cooling units via dry contacts.

[0126] In one exemplary embodiment, a refrigeration system is provided. Figures 1 to 5 As shown, the refrigeration system includes a plurality of refrigeration units 200 and the control unit 100 described above, and the refrigeration units 200 are electrically connected to the control unit 100 via dry contacts.

[0127] The control unit 100 may include a centralized control touch screen 101, a centralized control main board 102, and a liquid supply unit main board 103, and the refrigeration system further includes a communication gateway 300. The centralized control touch screen 101, the centralized control main board 102, and the liquid supply unit main board 103 are electrically connected to the communication gateway 300 via a first communication bus 400. The plurality of refrigeration units 200 are electrically connected to the communication gateway 300 via a second communication bus 500 to achieve communication between the control unit 100 and the plurality of refrigeration units 200.

[0128] That is, in order to enhance the anti-interference performance of the control network, this embodiment designs an isolated communication network topology, in which the centralized control touch screen 101, the centralized control main board 102, the liquid supply unit and the communication gateway 300 are on the same communication bus (i.e., the first communication bus 400), and all refrigeration units 200 and the communication gateway 300 are on the same communication bus (i.e., the second communication bus 500), so that two isolated communication networks are formed inside and outside the electrical box, thereby minimizing the impact of external environmental interference on the interior of the centralized control box.

[0129] Among them, DI and DO interfaces can be designed respectively between the centralized control main board 102 and the refrigeration unit 200 (specifically, it can be the main board of the refrigeration unit 200), wherein the DO interface of the centralized control main board 102 is connected to the DI interface of the refrigeration unit 200 for controlling the on / off of the refrigeration unit 200, and the DI interface of the centralized control main board 102 is connected to the DO interface of the refrigeration unit 200 for receiving the switch operation and fault status of the refrigeration unit 200.

[0130] Among them, the refrigeration unit 200 itself can be provided with an inlet liquid temperature sensor and an outlet liquid temperature sensor. When the communication with the centralized control mainboard 102 is abnormal, the refrigeration unit 200 can perform autonomous frequency modulation control according to the inlet liquid temperature collected by its own inlet liquid temperature sensor and the outlet liquid temperature collected by the outlet liquid temperature sensor, as well as the target temperature memorized by itself, that is, the refrigeration unit 200 is in an autonomous frequency modulation control state at this time. When the communication between the refrigeration unit 200 and the centralized control mainboard 102 is normal, the refrigeration unit 200 can enter autonomous frequency modulation control according to the inlet and outlet liquid temperatures collected by itself and the target temperature sent by the centralized control mainboard 102.

[0131] In this embodiment, when the centralized control touch screen 101 sends a power-on command to the centralized control mainboard 102, the centralized control mainboard 102 will control the refrigeration unit 200 to turn on through dry contacts based on the liquid inlet temperature, liquid outlet temperature, external ambient temperature, and dry contact feedback information of the liquid cooling system.

[0132] The refrigeration unit 200 may include a compressor and a fan. The operating status of the refrigeration unit 200 may be reported to the centralized control mainboard 102 through communication, including the operating time of the refrigeration unit 200, the operating frequency of the fan, the operating frequency of the compressor, and the outlet temperature of the refrigeration unit 200. The centralized control mainboard 102 may adjust the operating frequency of the fan and the compressor in each refrigeration unit 200 according to the operating load of all refrigeration units 200 and the load of the system to ensure the balanced operation of all refrigeration units 200.

[0133] Among them, since the higher the operating frequency of the compressor, the greater the degree of wear, all refrigeration units 200 can accumulate wear according to the operating time t and the operating frequency f of the compressor, and the accumulated loss value F=∫f(t)dt.

[0134] During the startup process of the refrigeration system, the refrigeration unit 200 can feedback whether there is a startup failure through the dry contact. After obtaining the feedback information of the dry contact, the centralized control mainboard 102 can filter out the refrigeration units 200 with startup failures and control the startup of the refrigeration units 200 without startup failures.

[0135] Among them, for the refrigeration units 200 without startup failure and normal communication, they can be sorted from small to large according to the loss accumulation information F to obtain a first sequence. For the refrigeration units 200 without startup failure but abnormal communication, they can be sorted according to the sequence of the physical addresses of the refrigeration units 200 to obtain a second sequence.

[0136] The start-up dry contact control signal is sent to the refrigeration units 200 with a small ranking, and the refrigeration units 200 are started in the first sequence first. When all the refrigeration units 200 in the first sequence are started, the refrigeration units 200 are then started in the second sequence.

[0137] Among them, since the refrigeration unit 200 has independent frequency modulation operation control, the time when each refrigeration unit 200 receives the startup instruction scheduled by the centralized control mainboard 102 is different, so there will be inconsistency in the operating frequency between the refrigeration units 200 during operation.

[0138] Based on this, in this embodiment, for M refrigeration units 200 with normal communication, when these M refrigeration units 200 are all in the autonomous frequency modulation control state, the centralized control mainboard 102 can collect the current operating frequencies of the compressors and the current operating frequencies of the fans in all refrigeration units 200 every t1 (i.e., the first time interval), and then calculate the average operating frequency f1 of the compressors and the average operating frequency f2 of the fans respectively, and send the average operating frequency f1 of the compressors and the average operating frequency f2 of the fans to all running refrigeration units 200. After receiving the average frequency operation instruction, the refrigeration unit 200 adjusts x Hz (i.e., sets the frequency adjustment gradient) every t2 (i.e., the second time interval) until the operating frequency of the compressors in all refrigeration units 200 reaches f1 and the operating frequency of the fans reaches f2, and then enters the autonomous frequency modulation control state.

[0139] For the refrigeration unit 200 with abnormal communication, autonomous frequency modulation control is performed according to the inlet temperature, outlet temperature and memorized target temperature (which can be the outlet target temperature) of the refrigeration unit 200. When the compressor and fan of the refrigeration unit 200 are in the state of the highest operating frequency for more than t3 (i.e., the third time interval), the frequency is automatically reduced by 20% to avoid long-term operation in a high-frequency state. For the refrigeration unit 200 that has not reached the highest operating frequency, autonomous frequency modulation control can be maintained.

[0140] Through the above processing conditions, the entire refrigeration system can achieve balanced operation of the equipment under normal conditions, which can prevent damage to individual refrigeration units 200 caused by long-term high-load operation, avoid abnormal wear caused by high-load operation of some equipment, and reduce the noise of the entire equipment. In addition, even in a complex interference environment, multiple refrigeration units 200 can be dispatched through dry contact control to ensure the refrigeration needs of the equipment.

[0141] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0142] It should be noted that the phrases "one implementation", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0143] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or food processor that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or food processor. In the absence of more limitations, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or food processor that includes the elements.

[0144] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A control method, characterized in that: Applied to a refrigeration system, the refrigeration system includes a control unit and a plurality of refrigeration units, the refrigeration units are electrically connected to the control unit via dry contacts, and the control method includes: For N refrigeration units without startup failure, the communication status of the N refrigeration units is detected based on dry contacts; wherein N is an integer greater than or equal to 1, and the communication status includes normal communication and abnormal communication; For the M refrigeration units with normal communication, sort them based on the accumulated loss information of the refrigeration units to obtain a first sequence; wherein M is an integer greater than or equal to 0 and less than or equal to N; For the NM refrigeration units with abnormal communication, sort them based on the physical addresses of the refrigeration units to obtain a second sequence; Based on the first sequence and the second sequence, the opening of the N refrigeration units is controlled by dry contacts.

2. The control method according to claim 1, characterized in that: The step of sorting based on the accumulated loss information of the refrigeration units to obtain a first sequence includes: Determine the M accumulated loss information of the M refrigeration units with normal communication; wherein the M accumulated loss information corresponds one-to-one to the M refrigeration units; Based on the ascending order of the M pieces of loss accumulation information, the corresponding M refrigeration units are sorted to obtain the first sequence.

3. The control method according to claim 2, characterized in that: The M accumulated loss information of the M refrigeration units that are determined to have normal communication includes: The operation frequency and the operation time of the refrigeration unit are accumulated to determine the accumulated loss information corresponding to the refrigeration unit.

4. The control method according to claim 1, characterized in that: The method of controlling the opening of the N refrigeration units through dry contacts based on the first sequence and the second sequence includes: Based on the order of the refrigeration units in the first sequence, controlling the refrigeration units in the first sequence to be turned on one by one through dry contacts; After all the refrigeration units in the first sequence are turned on, based on the order of the refrigeration units in the second sequence, the refrigeration units in the first sequence are controlled to be turned on one by one through dry contacts.

5. The control method according to claim 1, characterized in that: After controlling the opening of the plurality of refrigeration units based on the first sequence and the second sequence, the control method includes: For the M refrigeration units with normal communication, when the M refrigeration units are in an autonomous frequency modulation control state, the M current operating frequencies of the M refrigeration units are detected once at a first time interval; wherein the M current operating frequencies correspond one to one with the M refrigeration units; Based on the M current operating frequencies, determining an average operating frequency of the M refrigeration units; The average operating frequency is transmitted to the M refrigeration units, so that the refrigeration units gradually adjust their operating frequencies to the average operating frequency with a set frequency adjustment gradient and a second time interval, and then enter the autonomous frequency modulation control state.

6. The control method according to any one of claims 1 to 5, characterized in that: The control method comprises: A plurality of startup failures of the refrigeration units are detected by dry contacts.

7. A control unit, characterized in that: The control unit includes a detection module, a sorting module and a control module, wherein: The detection module is used to detect the communication status of the N refrigeration units without startup failure based on dry contacts; wherein the communication status includes normal communication and abnormal communication; The sorting module is used to sort the M refrigeration units with normal communication based on the accumulated loss information of the refrigeration units to obtain a first sequence; and is also used to sort the NM refrigeration units with abnormal communication based on the physical addresses of the refrigeration units to obtain a second sequence; The control module is used to control the start-up sequence of the N refrigeration units based on the first sequence and the second sequence.

8. A refrigeration system, characterized in that: The refrigeration system comprises a plurality of refrigeration units and a control unit as claimed in claim 7, wherein the refrigeration units are electrically connected to the control unit via dry contacts.

9. The refrigeration system according to claim 8, characterized in that: The refrigeration unit has an autonomous frequency modulation control state, wherein NM refrigeration units with abnormal communication are in the autonomous frequency modulation control state, and the refrigeration unit is in the autonomous frequency modulation control state: The refrigeration unit adjusts the operating frequency of the refrigeration unit based on the liquid inlet temperature, the liquid outlet temperature and the target temperature; wherein the target temperature is the set temperature received when the refrigeration unit is in normal communication; and / or, After the refrigeration unit operates at the set operating frequency for a third time interval, the operating frequency of the refrigeration unit is adjusted to decrease by a set amplitude.

10. The refrigeration system according to claim 8 or 9, characterized in that: The control unit includes a centralized control touch screen, a centralized control main board and a liquid supply unit main board. The refrigeration system also includes a communication gateway. The centralized control touch screen, the centralized control main board and the liquid supply unit main board are electrically connected to the communication gateway through a first communication bus. The multiple refrigeration units are electrically connected to the communication gateway through a second communication bus to achieve communication between the control unit and the multiple refrigeration units.

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