CN118980224A

CN118980224A - Refrigeration control method, device, electronic equipment and cold storage

Info

Publication number: CN118980224A
Application number: CN202411263962.6A
Authority: CN
Inventors: 周巍; 龙忠铿; 罗炽亮; 练浩民; 李莹
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2024-09-10
Filing date: 2024-09-10
Publication date: 2024-11-19

Abstract

The present invention provides a refrigeration control method, device, electronic device and cold storage, which optimize the operating load of the compressor through a phased loading strategy, and significantly reduce the frequent start and stop problem of the compressor. First, in the conventional refrigeration mode, the target compressor is selected and gradually loaded to the first load threshold at a lower first loading speed to avoid the frequent start and stop of the compressor when the load is low. When the target compressor reaches the first load threshold, the non-target compressor is controlled to load at the same loading speed, and at this time the target compressor is maintained at a stable first load level, further reducing the risk of frequent start and stop caused by load fluctuations in the cold storage system. Finally, when all compressors reach the first load threshold, they are loaded to the second load threshold at a higher second loading speed at the same time, ensuring that the compressor quickly enters the high-efficiency working range and avoiding the frequent start and stop problem caused by low-load operation.

Description

Refrigeration control method and device, electronic equipment and refrigeration house

Technical Field

The invention relates to the technical field of refrigeration houses, in particular to a refrigeration control method, a refrigeration control device, electronic equipment and a refrigeration house.

Background

The multi-unit compressor refrigeration house refers to a refrigeration house refrigeration system which uses a plurality of compressors to run in parallel, and can be applied to food processing factories, medicine storage and large markets and supermarkets.

In a refrigeration house application scenario with multiple unit compressors, if the number of compressors is configured according to the maximum load and the loading and unloading speed is fixed in a maintenance stage, the refrigeration house system may not accurately adjust the operation state of the compressors, resulting in frequent start and stop of the compressors in a low load state. For example, when the load is small, the compressor may be started up quickly to meet the refrigeration demand, but shut down quickly after the target temperature is reached. Then, the temperature rises slightly, and the compressor is restarted, so that the phenomenon of frequent start and stop is formed. Therefore, in the related art, the multi-unit compressor has a technical problem of frequent start-stop.

Disclosure of Invention

The invention aims to overcome the technical defects and provide a refrigeration control method, a refrigeration control device, electronic equipment and a refrigeration house, so as to solve the technical problem that a compressor of a multi-unit machine set is frequently started and stopped in the related art.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a refrigeration control method, the method comprising:

Identifying an operation state mode of the refrigeration house; wherein the refrigerator is configured with a compressor unit configured with at least two compressors; wherein the operating state mode includes at least a normal cooling mode;

determining a target compressor from the at least two compressors when the operating state mode is a normal cooling mode;

When a loading action is required to be executed, controlling the target compressor to execute loading at a first loading speed;

When the target compressor is loaded to a first load threshold value, controlling a non-target compressor to execute loading at a first loading speed; wherein when a non-target compressor performs loading, controlling a load of the target compressor to be maintained at the first load threshold;

When the non-target compressor is loaded to a first load threshold, controlling the compressor unit to be loaded to a second load threshold at a second loading speed; wherein the second load threshold is higher than the first load threshold and the second loading speed is higher than the first loading speed.

In a second aspect, the present invention provides a refrigeration control apparatus, the apparatus comprising:

The identifying device is used for identifying the running state mode of the refrigeration house; wherein the refrigerator is configured with a compressor unit configured with at least two compressors; wherein the operating state mode includes at least a normal cooling mode;

a determining module for determining a target compressor from the at least two compressors when the operating state mode is a normal cooling mode;

the first control module is used for controlling the target compressor to execute loading at a first loading speed when the loading action is required to be executed;

A second control module for controlling the non-target compressor to perform loading at a first loading speed when the target compressor is loaded to a first loading threshold; wherein when a non-target compressor performs loading, controlling a load of the target compressor to be maintained at the first load threshold;

A third control module for controlling the compressor string to load to a second load threshold at a second loading speed when the non-target compressor is loaded to the first load threshold; wherein the second load threshold is higher than the first load threshold and the second loading speed is higher than the first loading speed.

In a third aspect, the present invention provides an electronic device, comprising: a memory, and one or more processors communicatively coupled to the memory; the memory has stored therein instructions executable by the one or more processors, the instructions are executed by the one or more processors to cause the one or more processors to implement the methods described above.

In a fourth aspect, the present invention provides a refrigerator comprising: the method is adopted or the electronic equipment is included.

The beneficial effects are that:

According to the invention, firstly, through a staged loading strategy, the running load of the compressor is optimized, and the frequent start-stop problem of the compressor is remarkably reduced. First, in a normal refrigeration mode, a target compressor is selected and gradually loaded to a first load threshold at a lower first loading speed, so that frequent start and stop of the compressor when the load is lower is avoided. When the target compressor reaches the first load threshold, the non-target compressor is controlled to load at the same loading speed, and the target compressor is kept at a stable first load level, so that the risk of frequent start and stop caused by load fluctuation of the refrigeration storage system is further reduced. Finally, after all the compressors reach the first load threshold, the compressors are loaded to the second load threshold at a higher second loading speed, so that the compressors are ensured to rapidly enter a high-efficiency working interval, and the problems of energy consumption increase and frequent start and stop caused by low-load operation are avoided. Therefore, the embodiment successfully reduces frequent start and stop of the compressor by optimizing dynamic adjustment of loading speed and load, and improves the overall operation efficiency and stability of the refrigeration house system.

Drawings

Fig. 1 is a schematic flow chart of a refrigeration control method according to an embodiment of the present invention;

Fig. 2 is a schematic flow chart of a refrigeration control method according to an embodiment of the present invention;

Fig. 3 is a schematic flow chart of a refrigeration control method according to an embodiment of the present invention;

FIG. 4 is a block diagram of a refrigeration control apparatus employed in an embodiment of the present invention;

fig. 5 is a block diagram of an electronic device employed by an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

In the related art, the energy-saving operation of the refrigeration house is one of the targets pursued by practitioners, but the load of the refrigeration house is continuously changed, and when the goods enter the refrigeration house in the initial stage, the temperature of the refrigeration house is greatly increased, and at the moment, the compressor needs to be controlled to quickly cool down. After a period of operation, with the increase of humidity and the decrease of evaporation temperature, the frosting on the surface of the evaporator becomes serious, the heat exchange is affected, and even if the compressor runs at full load, the temperature of the refrigeration house is slowly decreased or even no longer decreased, so that the frosting is needed. After the goods are put in storage for a period of time, the goods enter a maintenance stage, and the refrigeration load is reduced.

If the number of compressors is configured with the maximum load and the loading and unloading speed is fixed, the technical problem of frequent start and stop of the compressors in the maintenance stage can occur. Accordingly, if the number of compressors or the loading and unloading speed is configured with the maintenance stage load, the temperature is slowly lowered during the warehouse-in stage, and even the expected temperature is not reached.

Therefore, aiming at the technical problem that the compressor is frequently started and stopped in the maintenance stage, the invention optimizes the running load of the compressor through a staged loading strategy and obviously reduces the problem of frequent start and stop of the compressor. First, in a normal refrigeration mode, a target compressor is selected and gradually loaded to a first load threshold at a lower first loading speed, so that frequent start and stop of the compressor when the load is lower is avoided. When the target compressor reaches the first load threshold, the non-target compressor is controlled to load at the same loading speed, and the target compressor is kept at a stable first load level, so that the risk of frequent start and stop caused by load fluctuation of the refrigeration storage system is further reduced. Finally, after all the compressors reach the first load threshold, the compressors are loaded to the second load threshold at a higher second loading speed, so that the compressors are ensured to rapidly enter a high-efficiency working interval, and the problems of energy consumption increase and frequent start and stop caused by low-load operation are avoided. Therefore, the embodiment successfully reduces frequent start and stop of the compressor by optimizing dynamic adjustment of loading speed and load, and improves the overall operation efficiency and stability of the refrigeration house system.

As shown in fig. 1, the present embodiment provides a refrigeration control method, which may be performed by a controller, and may include:

Step S102: identifying an operation state mode of the refrigeration house; wherein the refrigerator is configured with a compressor unit configured with at least two compressors; wherein the operating state mode includes at least a normal cooling mode.

In this embodiment, the identified operation may be expressed as acquiring some parameters indicating the operation state of the refrigerator, and identifying the current operation state mode of the refrigerator based on the parameters.

Specifically, the temperature of the current refrigeration house can be detected firstly, and then the detected temperature of the refrigeration house is compared with a preset temperature threshold value, so that the judgment of the running state mode of the refrigeration house is realized. More specifically, the preset temperature threshold may be determined experimentally or by simulation of simulation software.

In some embodiments, the parameter indicative of the state of operation of the refrigeration storage may also be a compressor operation time, which may be an accumulated operation time of each compressor over a period of time. For example, it is possible to determine whether the compressor is in a high load or low load state for a long time by analyzing the operation time of the compressor. The fluctuation of the refrigerating demand can be reflected by the change of the running time, and then the running state mode of the refrigeration house can be identified.

In some embodiments, the parameter indicating the operation state of the refrigerator may also be an evaporator pressure, where the evaporator pressure is expressed as a pressure of the refrigerant in the evaporator. High pressure generally means that the evaporator load increases and the refrigeration demand is greater. A low pressure may indicate a reduced evaporator efficiency, a smaller load, or a build-up of frost, and a reduced refrigeration efficiency. In the conventional refrigeration mode, the evaporator pressure typically fluctuates over a stable range. At this time, the evaporator is in a normal working state, the variation amplitude of the pressure is small, and the refrigeration requirement is stable. In the fast cooling mode, the cooling needs to be rapidly reduced, so that the pressure of the evaporator is increased due to the increase of the cooling medium demand in the evaporator, and particularly, the pressure is obviously increased when a large amount of cooling medium enters the evaporator in a short time. When the pressure of the evaporator is detected to continuously drop below the set value, and the temperature drop rate of the evaporator is reduced, the possible frosting on the fins of the evaporator can be judged.

In some embodiments, the parameter indicating the operation state of the refrigerator may be a humidity of the refrigerator, a defrosting period, or a refrigerant flow rate.

In this embodiment, the operation state mode may include a normal cooling mode, a defrosting mode, and a rapid cooling mode.

In this embodiment, the refrigerator may be a refrigerator equipped with multiple compressors, where the multiple compressors include at least two compressors, and may be three compressors, four compressors, or five compressors, etc. These compressors are operated in parallel.

In this embodiment, the refrigeration house may be a complete cooling room, and one or more air coolers may be disposed in the cooling room to perform refrigeration. For example, multiple air coolers may be arranged in different areas of a complete cooling compartment. The refrigerator can be divided into a plurality of cold rooms, the cold rooms are mutually isolated, and each cold room can be provided with one or more air coolers for independent refrigeration operation. Therefore, each cold room can independently operate according to the self refrigeration requirement without mutual interference. For example, some cold rooms may need to be maintained at a lower temperature (e.g., for frozen foods), while other cold rooms may only need to be maintained at a higher temperature (e.g., for refrigerated fruits and vegetables).

It is understood that the cooling room can be divided into a plurality of cooling rooms, and the cooling fans are all connected with the compressors of the multi-connected unit.

In one possible specific embodiment, the operational state mode may be identified as a normal cooling mode when the bin temperature is less than the upper bin temperature limit + the upper bin temperature limit, and the bin temperature is greater than the upper bin temperature limit.

In this embodiment, the compressor unit may be represented as a system composed of two or more compressors. In the present embodiment, each compressor in the compressor unit may be operated individually or in combination according to the actual load demand of the refrigerator.

In this embodiment, the normal cooling mode refers to that the compressor unit is operated according to a normal load demand to maintain a target temperature set in the refrigerator during normal daily operation of the refrigerator. In this mode, the compressor can adjust the workload by automatic loading and unloading according to the actual refrigeration requirement of the refrigeration house, ensuring that the temperature in the refrigeration house fluctuates within a reasonable range. Step S104: when the operation state mode is a normal cooling mode, a target compressor is determined from the at least two compressors.

In this embodiment, the target compressor is represented as a compressor selected according to at least one screening condition so as to preferentially assume the current task. Specifically, the screening conditions may be cumulative operating time, operating temperature, energy efficiency ratio of the compressor or the number of times the compressor is started, etc. The current task may be load, unload, or start-stop, etc.

In this embodiment, the target compressor may be determined based on the accumulated operating time, and thus, the step of determining the target compressor from the at least two compressors may include:

And determining the compressor with the shortest accumulated running time of the at least two compressors as a target compressor.

It will be appreciated that by determining the compressor with the shortest cumulative operating time as the target compressor, a balanced use of the compressors can be achieved, avoiding excessive wear and efficiency degradation caused by a certain compressor operating continuously for a long time. Therefore, the service life of the equipment can be prolonged, the maintenance cost is reduced, and meanwhile, the whole refrigeration house system is ensured to operate in a high-efficiency state by uniformly distributing the load. In addition, the balanced use of the compressors is also beneficial to reducing frequent start and stop of a single compressor, and further optimizing the energy-saving effect and stability of the system.

In some embodiments, the target compressor may also be determined based on an operating temperature of the compressors, and thus the step of determining the target compressor from the at least two compressors may also include:

And determining the compressor with the lowest operating temperature of the at least two compressors as a target compressor.

It is understood that the operating temperature of the compressor may reflect the operating conditions of the compressor. Selecting a compressor with a lower temperature as the target compressor can reduce the risk of overheating, and improve the life of the compressor and the reliability of the refrigeration storage system.

In some embodiments, the target compressor may also be determined based on an energy efficiency ratio of the compressors, and thus the step of determining the target compressor from the at least two compressors may also include:

And determining the compressor with the highest energy efficiency ratio of the at least two compressors as a target compressor.

It can be understood that by selecting a compressor with a high energy efficiency ratio, the energy saving effect of the refrigeration house system can be improved, and meanwhile, the high-efficiency refrigeration of the system is ensured.

In some embodiments, the target compressor may also be determined based on the number of starts of the compressors, and thus the step of determining the target compressor from the at least two compressors may also include:

And determining the compressor with the lowest starting frequency of the at least two compressors as a target compressor.

It will be appreciated that a compressor with an excessive number of starts may result in increased wear on the equipment. Therefore, the compressor with the lowest starting frequency can be selected as a target to balance the starting frequency of the equipment and prolong the service life of the equipment.

In some embodiments, the above-described plurality of screening conditions may also be combined to determine the target compressor.

Step S106: when the loading action needs to be executed, the target compressor is controlled to execute loading at a first loading speed.

In this embodiment, the need to perform the loading action may be indicated as the need to perform the loading action when the preset trigger condition is detected to be triggered. The preset trigger condition may be that the freezer temperature is higher than a set target temperature. The preset trigger condition may also be that the garage door is frequently opened. The preset triggering condition can also be that refrigeration is restored after defrosting is finished, and the like. Specifically, when the current freezer temperature of the freezer is higher than the set target temperature, it is indicated that the cooling demand is increased. At this time, the controller detects the temperature change and judges that the load of the existing compressor is insufficient to reduce the temperature of the refrigerator, thereby triggering the loading action.

In this embodiment, the loading action is represented as increasing the compressor's workload during operation, enabling it to handle more refrigeration demands.

In this embodiment, the first loading speed may be a slower loading speed. In particular, the first loading speed may be expressed as a loading speed that gradually increases the working load of the compressor at a relatively slow and steady speed during loading of the compressor, such that the compressor gradually transitions from a low load or unloaded condition to a first load threshold.

The first loading speed can be used for gradually lifting the control process of the load of the compressor, so that the refrigeration house system can be ensured to run stably and efficiently when the load is increased, and unnecessary energy consumption and fluctuation of the compressor caused by too fast load increase are avoided.

In one possible embodiment, the first loading rate may be a loading rate that increases the load by 5% per minute, a loading rate that increases the load by 7% per minute, or a loading rate that increases the load by 10% per minute.

In this embodiment, the step of controlling the target compressor to perform loading at the first loading speed may include:

and controlling the capacity adjustment loading electromagnetic valve of the target compressor to open the climbing loading time so as to enable the target compressor to execute climbing loading.

Except that loading at the first loading speed can be achieved by controlling the capacity modulated loading solenoid valve to open the hill climbing loading time. In some embodiments, the slide valve may also be adjusted to vary the compression volume inside the target compressor to control the load of the compressor. Specifically, the first loading speed can be realized by gradually opening the slide valve, so that the target compressor gradually increases the compression amount of the refrigerant. The opening amplitude and time of the slide valve can be controlled, so that the slide valve is gradually opened in a longer time, and the effect of stable loading is achieved.

In some embodiments, the load of the target compressor may also be gradually increased by adjusting a throttle device (e.g., expansion valve, throttle valve) that the target compressor enters the refrigeration circuit to limit the inflow of refrigerant.

Step S108: when the target compressor is loaded to a first load threshold value, controlling a non-target compressor to execute loading at a first loading speed; wherein when a non-target compressor performs loading, the load of the target compressor is controlled to be maintained at the first load threshold.

In this embodiment, the first load threshold may be a threshold equal to or higher than 50%. For example, 50%,55%, or 60%, etc.

In one possible specific embodiment, the first load threshold may be 50%. Specifically, when the load of the compressor exceeds 50%, the relation between the capacity and the power consumption tends to be linear, and the energy efficiency is obviously improved; and below 50%, the magnitude of the power consumption reduction is smaller than that of the coldness reduction. Therefore, the energy efficiency can be optimized by keeping the capacity of the compressor to be more than 50%, and the overall energy-saving effect of the refrigeration house system is improved.

In the present embodiment, the non-target compressor may be represented as a compressor other than the target compressor.

In this embodiment, the step of controlling the non-target compressor to perform loading at the first loading speed may include:

and controlling the capacity adjustment loading electromagnetic valve of the non-target compressor to open the climbing loading time so as to enable the non-target compressor to execute the climbing loading.

It will be appreciated that loading at the first loading speed may be achieved by controlling the capacity modulated loading solenoid valve to open the hill climbing loading time. In some embodiments, the slide valve may also be adjusted to vary the compression volume inside the non-target compressor to control the load of the compressor. Specifically, the first loading speed can be realized by gradually opening the slide valve, so that the non-target compressor gradually increases the compression amount of the refrigerant. The opening amplitude and time of the slide valve can be controlled, so that the slide valve is gradually opened in a longer time, and the effect of stable loading is achieved.

In some embodiments, the load of the non-target compressor may also be gradually increased by adjusting a throttle device (e.g., expansion valve, throttle valve) that the non-target compressor enters the refrigeration circuit to limit the inflow of refrigerant.

In the present embodiment, when the target compressor is loaded to the first load threshold, the load of the target compressor can be stabilized at the first load by stopping the loading operation of the capacity modulation solenoid valve and locking the current load state.

Step S110: when the non-target compressor is loaded to a first load threshold, controlling the compressor unit to be loaded to a second load threshold at a second loading speed; wherein the second load threshold is higher than the first load threshold and the second loading speed is higher than the first loading speed.

In this embodiment, the second loading speed is a higher loading speed than the first loading speed. For example, in the case where the first loading speed is 5%, the second loading speed may be 10%. I.e. 10% load increase per minute, from 50% load to 100% load over 5 minutes. It will be appreciated that the second loading rate may also be 12%,14% or 16% and so on.

In this embodiment, the step of controlling the target compressor and the non-target compressor to be loaded at the second loading speed to the second loading threshold may include:

and controlling the capacity modulation loading electromagnetic valves of the target compressor and the non-target compressor to open the quick loading time so as to enable the target compressor and the non-target compressor to execute quick loading.

In some embodiments, when the non-target compressor is loaded to the first load threshold value, the rotating speed of the motor can be also increased, so that the compressor can quickly enter a high-load running state. For example, the frequency may be increased from 50Hz to 60Hz in a short time by controlling the variable frequency control to achieve control of both the targeted and non-targeted compressors to load at a second loading speed to a second loading threshold.

In some embodiments, the controller may also rapidly and fully open the slide valve when the non-target compressor is loaded to the first load threshold, increasing the flow of refrigerant into the compressor, thereby increasing the load lifting speed. To achieve control of loading of both the target compressor and the non-target compressor to a second load threshold at a second loading speed.

In the present embodiment, the second load threshold is a threshold that is higher than the first load threshold. The second load threshold may be expressed as a higher load upper limit to which the compressor continues to load after exceeding the first load threshold (e.g., 50%) during loading. For example, it may be 100% full load, 80% load, or 90% load, etc.

It will be appreciated that the second load threshold may be flexibly set.

In this embodiment, the operating load of the compressor is optimized by a staged loading strategy, significantly reducing the frequent start-stop problems of the compressor. First, in a normal refrigeration mode, a target compressor is selected and gradually loaded to a first load threshold at a lower first loading speed, so that frequent start and stop of the compressor when the load is lower is avoided. When the target compressor reaches the first load threshold, the non-target compressor is controlled to load at the same loading speed, and the target compressor is kept at a stable first load level, so that the risk of frequent start and stop caused by load fluctuation of the refrigeration storage system is further reduced. Finally, after all the compressors reach the first load threshold, the compressors are loaded to the second load threshold at a higher second loading speed, so that the compressors are ensured to rapidly enter a high-efficiency working interval, and the problems of energy consumption increase and frequent start and stop caused by low-load operation are avoided. Therefore, the embodiment successfully reduces frequent start and stop of the compressor by optimizing dynamic adjustment of loading speed and load, and improves the overall operation efficiency and stability of the refrigeration house system.

As shown in fig. 2, in some embodiments, the method may further comprise:

step S112: when the unloading action needs to be executed, the compressor unit is controlled to execute unloading at a stable unloading speed.

In this embodiment, a smooth unloading speed may mean that the compressor gradually decreases its workload speed at a relatively smooth and slow speed during the unloading process. The speed can be used for avoiding the excessively rapid load change of the compressor when the load is reduced, so that the stable operation of the system is ensured. In the embodiment, the smooth unloading speed can be realized by controlling the capacity adjustment unloading electromagnetic valve of the compressor to be opened for a longer climbing unloading time, namely, the working load of the compressor is gradually reduced, and the smooth transition of the load is ensured. Thus, the smooth unloading speed may be a slower unloading speed, e.g. a 5% load reduction per minute. Assuming that the second load threshold is full load (100%) and the first load threshold is 50%, ten minutes are required to reduce the full load to 50%, and the entire process is completed within 10 minutes.

In this embodiment, the step of controlling the compressor unit to perform unloading at a smooth unloading speed may include:

And controlling capacity adjustment unloading electromagnetic valves of the target compressor and the non-target compressor to open climbing unloading time so that the target compressor and the non-target compressor execute climbing unloading.

In some embodiments, similar to the method provided in the above embodiments, the control of the targeted and non-targeted compressors while performing unloading at a smooth unloading rate may also be achieved by variable frequency control of the speed modulated unloading, closing of the slide valve, or a gradual decrease in refrigerant flow.

Step S114: when the compressor sets are all unloaded to a first load threshold, stopping the non-target compressors and controlling the target compressors to be unloaded to standby at a smooth unloading speed.

In this embodiment, stopping the non-target compressor may be achieved by turning off a power control signal of the non-target compressor. The liquid supply solenoid valve may be closed to cut off the refrigerant supply, so that the non-target compressor may stop automatically due to the inability to compress refrigerant.

In the present embodiment, on the one hand, by stopping the non-target compressor whose cumulative operating time is longer, the target compressor whose cumulative operating time is shorter can be made to continue to operate. This helps to equalize the run time of each compressor, avoiding excessive operation of a single compressor, and thus extending the overall life of the device. On the other hand, the non-target compressor with longer accumulated running time is stopped, the target compressor with short accumulated running time is allowed to continue to work, frequent start-stop phenomena can be reduced, and the running efficiency of the compressor is optimized. Frequent start-up and shut-down of the compressor not only consumes more energy, but also accelerates equipment wear.

In this embodiment, by synchronously controlling the targeted and non-targeted compressors at a smooth unloading rate, it is possible to ensure that the refrigeration storage system reduces the workload of the compressors smoothly and in unison as the load is reduced, avoiding energy efficiency losses and system fluctuations due to load dips. When the compressor is unloaded to the first load threshold, the non-target compressor is stopped, thereby reducing unnecessary power consumption, and continuing to smoothly transition the target compressor to the standby state at a slower unloading speed. Therefore, the frequent start and stop of the compressor can be effectively avoided, the service life of equipment is prolonged, meanwhile, the energy efficiency of the refrigeration house system is optimized in the process of load reduction, and the stable operation of the refrigeration house system is ensured.

In some embodiments, the first load threshold is a load threshold greater than or equal to 50%.

When the compressor is loaded by more than 50%, the relation between the power consumption and the refrigerating capacity tends to be linear, and the energy efficiency is higher. Therefore, the load of keeping the compressor to run at more than 50% can improve the overall energy efficiency of the refrigeration house system, reduce energy waste, avoid the equipment abrasion caused by frequent start and stop of the compressor under low load, and prolong the service life of the compressor.

In some embodiments, the operational state mode further comprises: the defrosting mode, the step of identifying the operation state mode of the refrigerator may include:

detecting the current temperature of the refrigeration house.

In this embodiment, the current refrigerator temperature may be detected by a digital temperature sensor, a thermocouple temperature sensor, an infrared temperature sensor, or a temperature data integration system.

And judging whether the current temperature of the refrigeration house is greater than a first temperature threshold value.

In this embodiment, the first temperature threshold may be determined by experiment or simulation.

In a specific embodiment, the first temperature threshold may be a bin temperature upper limit + a bin temperature upper limit. Specifically, the upper limit of the bank temperature may represent a maximum temperature value set during normal cooling operation of the refrigerator. If the storage temperature exceeds this upper limit, the freezer may not continue to remain within the desired temperature range set and further regulation may be required (e.g., increasing the cooling power or entering a defrost mode). For example, when a refrigerator is used to hold fresh food, the upper limit of the storage temperature may be set to 0℃and when a freezer is used to hold frozen food, the upper limit of the storage temperature may be-18℃or less. The upper temperature limit may represent the maximum temperature value allowed for the warehoused cargo when new cargo is placed in the freezer. When new goods are put in storage, a large amount of heat is released, so that the temperature of the refrigeration house rises, and the upper limit of the storage temperature is used for ensuring that the temperature of the whole refrigeration house is not influenced excessively when the temperature of the goods is too high. For example, the upper temperature of the vegetables in the freezer may be 10℃, while the upper temperature of the meat in the freezer may be-10℃. It is understood that by adding the upper temperature limit to the upper temperature limit as the first temperature threshold, the highest temperature level that the freezer can withstand after the shipment is in storage can be reflected. This threshold is used to determine if the freezer temperature has exceeded the normal fluctuation range, and when the freezer temperature exceeds the first temperature threshold, it may mean that the freezer system needs to enter a defrost mode or an enhanced refrigeration mode.

In some embodiments, the first temperature threshold may also be a base temperature upper limit+a safety margin, that is, the first temperature threshold may be added with a safety margin based on the base temperature upper limit, where the safety margin is a buffer setting for coping with temperature fluctuation or delay of the refrigeration system.

In some embodiments, the first temperature threshold may also be a dynamic upper library temperature limit. Specifically, the upper limit of the temperature of the refrigerator is dynamically adjusted according to the actual load and the running state of the refrigerator, so that the first temperature threshold value is dynamically generated.

In some embodiments, the first temperature threshold may also be a base temperature upper limit + an external ambient temperature change.

And determining the current temperature dropping rate of the refrigeration house under the condition that the current refrigeration house temperature is larger than the first temperature threshold value.

In this embodiment, the above-described temperature sensor may be disposed in the refrigerator in advance, and the temperature change of the refrigerator may be monitored in real time. The controller will record the temperature sensor readings in order to analyze the temperature change over time. Therefore, the temperature change trend of the refrigerator can be determined by analyzing the temperature data over a period of time. For example, if the rate of temperature decrease is gradually slowing down, if so, it may indicate that the evaporator fins are frosted and the refrigeration efficiency is reduced.

Judging whether the current temperature reduction rate of the refrigeration house is smaller than or equal to a temperature reduction rate threshold value.

In the present embodiment, the temperature decrease rate threshold value is a reference value or a threshold value set to determine whether or not the cooling efficiency of the refrigerator is normal. The temperature measuring device is used for measuring the falling speed of the temperature of the refrigeration house in unit time. When the actual decreasing rate of the temperature of the refrigeration house is lower than or equal to the threshold value, the refrigeration efficiency of the refrigeration house is reduced, the problem of frosting of the evaporator possibly exists, and the refrigeration capacity is limited.

In this embodiment, the normal temperature decrease rate of the refrigerator under various loads and environmental conditions can be measured by laboratory or actual operation refrigerator data. From these data, the lowest rate of decrease when the cooling effect is good is determined as a threshold value.

In the embodiment, the system performance under different temperature drop scenes can be simulated through the simulation model of the refrigeration system, the reasonable drop rate range of the system under the high-efficiency refrigeration state is found, and the threshold value is determined according to the simulation result.

And under the condition that the current temperature reduction rate of the refrigeration house is smaller than or equal to the temperature reduction rate threshold value, identifying the operation state mode of the refrigeration house as a defrosting mode.

In the embodiment, the refrigeration house system can intelligently identify defrosting requirements by comprehensively considering the changes of the temperature and the temperature falling rate of the refrigeration house, and ensures that the evaporator fins timely enter a defrosting mode when frosting influences the refrigeration efficiency. Specifically, first, the temperature of the refrigerator and the rate of temperature decrease are detected to determine whether or not the refrigeration efficiency is lowered. When the temperature drop rate is slow and the storage temperature is higher than a set threshold value, defrosting can be started in time, and the phenomenon that excessive frost layers are accumulated to influence the performance of the refrigeration storage is prevented. The mode can optimize refrigeration efficiency, reduce energy waste, keep the refrigeration house in an optimal working state, avoid unnecessary defrosting operation and prolong the service life of equipment.

As shown in fig. 3, in some embodiments, where the operating state mode is a defrost mode, the method further comprises:

Step S116: and when the operation state mode is a defrosting mode, controlling the at least two compressors to alternately operate and stop.

In this embodiment, in order to avoid overheating or equipment wear caused by long-time continuous operation of the compressor, the controller may control the compressor to be alternately started and stopped according to the accumulated operation time of the compressor. For example, if a compressor unit is configured with two compressors (compressor a and compressor B), the controller may cause compressor a to operate for a period of time, then stop and then start compressor B. The mode of alternately starting and stopping can balance the working time of the compressors, reduce the operation load of each compressor, avoid the continuous working of a single compressor for too long in the defrosting period, prolong the service life of the compressors and simultaneously maintain the continuity of the defrosting process. It will be appreciated that if a compressor train is configured with three or more compressors, likewise, alternating start and stop is required. When one of the compressors is operated, the remaining compressors are stopped.

Accordingly, the cooling fans in the refrigeration house can also be used for defrosting in a rotating way under the condition that the cooling fans are provided with a plurality of cooling fans. Specifically, the alternating defrosting of the air cooler can gradually remove the frost layer on the evaporator while ensuring the relatively stable overall temperature of the refrigeration house, and avoids temperature fluctuation caused by one-time defrosting.

In this embodiment, the compressor may perform the actions of climbing up and down while in the defrosting mode. When the climbing loading is executed, the capacity-adjusting loading electromagnetic valve is controlled, so that the compression amount of the refrigerant is gradually increased by the compressor in a climbing loading mode, and the air conditioning system can still maintain partial load operation during defrosting. This approach helps to reduce system load impact and avoid sudden increases in power consumption. When a certain compressor is in a stop state, the system can gradually reduce the load, and the compressor gradually reduces the compression amount in a climbing unloading mode through the capacity-adjusting unloading electromagnetic valve until the compressor is unloaded to a standby state. This avoids the compressor from causing severe fluctuations in temperature and pressure when suddenly stopped.

Step S118: controlling a refrigerant in the compressor unit to be directly input into the air cooler through a preset hot gas pipeline so as to at least melt a frost layer or an ice layer on an evaporator in the air cooler; wherein, the hot gas pipeline is the pipeline of intercommunication compressor and air-cooler.

In this embodiment, the hot gas pipeline is a dedicated pipeline connecting the compressor unit and the air cooler, and is used for directly conveying the high-temperature and high-pressure refrigerant from the compressor unit to the evaporator in the air cooler in the defrosting mode, so as to realize rapid melting of the frost layer or the ice layer on the evaporator. In general, the refrigerant is compressed by the compressor and then enters the air cooler through the condenser. However, in the defrosting mode, in order to quickly provide heat defrosting, the refrigerant does not pass through the condenser, but directly enters the air cooler through the hot gas pipeline.

The hot air pipeline is provided with a defrosting hot air electromagnetic valve which is used for controlling the flow of hot air. When the defrosting mode is entered, a defrosting hot gas electromagnetic valve is opened, and a high-temperature refrigerant is allowed to flow into an air cooler evaporator through a hot gas pipeline; when defrosting is not needed, the defrosting hot gas electromagnetic valve is closed to prevent hot gas from flowing. Through the control, the defrosting process can be flexibly adjusted according to the requirements, high-efficiency defrosting is ensured, and unnecessary heat loss is reduced. In the embodiment, by controlling the at least two compressors to alternately run and stop, the continuous work load of the compressors in the defrosting process can be effectively reduced, the service life of equipment is prolonged, and meanwhile, the impact of frequent start and stop of the compressors on a refrigeration storage system is avoided. In addition, use the hot gas pipeline that presets to directly introduce the air-cooler with the high temperature refrigerant in the compressor, melt frost layer or ice sheet on the evaporimeter through the steam, can resume the heat exchange ability of evaporimeter fast, improve defrosting efficiency, shorten defrosting time, avoid the refrigeration to interrupt the temperature stability who influences the freezer for a long time to guarantee the refrigeration effect and the energy efficiency of freezer.

In this embodiment, the operation state mode further includes: and a rapid refrigeration mode, wherein the step of identifying the running state mode of the refrigeration house further comprises the following steps:

And under the condition that the current temperature reduction rate of the refrigeration house is larger than the temperature reduction rate threshold value, identifying the operation state mode of the refrigeration house as a rapid refrigeration mode.

In this embodiment, by monitoring the rate of temperature decrease of the refrigerator and comparing with the temperature decrease rate threshold value, the controller can automatically recognize and enter the rapid cooling mode, thereby more effectively coping with the rapid increase of the refrigerator temperature. When the temperature drop rate is higher than the threshold value, the refrigerator is indicated to work normally and needs higher refrigerating capacity to meet the requirements of initial warehouse entry or sudden temperature rise, and the controller can optimize the working state of the compressor and accelerate the cooling process. Therefore, the temperature can be rapidly reduced when the demand of the refrigeration house is increased, the stability of the goods storage environment is ensured, the response speed of the refrigeration house system is improved, and the whole energy efficiency is improved.

In some embodiments, in the case where the operating state mode is a rapid cooling mode, the method further comprises:

a target compressor is determined from the at least two compressors.

And controlling the target compressor to execute loading at a second loading speed.

When the target compressor is loaded to a first load threshold value, controlling a non-target compressor to execute loading at a second loading speed; wherein when a non-target compressor performs loading, the load of the target compressor is controlled to be maintained at the first load threshold.

And when the non-target compressor is loaded to the first load threshold, controlling the target compressor and the non-target compressor to be both loaded to the second load threshold at the second loading speed.

In the embodiment, by loading the target compressor and the non-target compressor in stages, abrupt high-load operation of the compressor can be effectively avoided, impact of a refrigeration house system is reduced, and meanwhile stability and high efficiency of a refrigeration process are ensured. In the fast cooling mode, the controller first selects one target compressor, gradually loads the target compressor to a first load threshold value at a relatively high loading speed, and then gradually loads non-target compressors to keep the load balance of the system. Finally, when both compressors reach the first load threshold, loading to the second load threshold continues at a faster rate. The staged loading mode can optimize energy efficiency, reduce energy consumption, prolong equipment service life, and accelerate the temperature reduction speed of the refrigeration house at the same time, thereby ensuring that the rapid refrigeration requirement is met.

In some embodiments, when the operation state mode is a defrosting mode, and when the compressors are operated, the step of controlling the at least two compressors to alternately operate and stop includes:

When the loading action needs to be executed, the compressor is controlled to execute loading at a first loading speed.

When the unloading action needs to be performed, the compressor is controlled to perform unloading at a smooth unloading speed.

It will be appreciated that when the operating state mode is a defrost mode. The compressors in the compressor unit are alternately operated and stopped. When one of the compressors in the compressor rack is running (the remaining compressors are stopped), it is possible to load on a hill (the loading is performed at a first loading speed) or to unload on a hill (the unloading is performed at a steady unloading speed).

In the embodiment, the working load of the compressor can be effectively balanced by controlling the compressor to alternately run and stop in the defrosting mode and adopting a strategy of smooth unloading and staged loading, so that overheating and equipment abrasion caused by long-time continuous running can be avoided. The stable unloading speed ensures that the load of the system in the unloading process is gradually reduced, and the temperature and the pressure are prevented from being severely fluctuated, so that the running stability of the refrigeration house system is improved, and the service life of the compressor is prolonged. Meanwhile, the staged loading mode can also gradually increase the flow of the refrigerant, reduce load impact, ensure that the system can maintain partial load operation during defrosting, and ensure the continuity of the defrosting process and the relative stability of the temperature of the refrigeration house.

In one possible embodiment, the embodiment can be applied to an application scene of a parallel screw unit compressor, and specifically can be an application scene comprising a first compressor, a second compressor, a first cold room and a second cold room. The first cooling room and the second cooling room form a refrigeration house. The first cooling room is provided with a first air cooler for refrigerating the first cooling room. The second cooling room is provided with a second air cooler for refrigerating the second cooling room. Correspondingly, corresponding electromagnetic valves are also arranged on the pipelines of the first compressor and the second compressor as well as the first air cooler and the second air cooler so as to control the flow of the refrigerant.

Specifically, when the first air cooler and the second air cooler refrigerate, the refrigerant in the condenser passes through the first liquid supply electromagnetic valve, and the first expansion valve enters the first air cooler to exchange heat, so that refrigeration of the first cooling room is realized. The refrigerant in the condenser passes through a second liquid supply electromagnetic valve, and the second expansion valve enters into a second air cooler to exchange heat, so that refrigeration of a second cooling room is realized. Correspondingly, the refrigerant in the first air cooler reenters the first compressor and the second compressor through the first steam return electromagnetic valve. Refrigerant in the second air cooler reenters the first compressor and the second compressor through the second steam return electromagnetic valve.

It should be noted that, in the refrigerating process of the first cold room and the second cold room, the first hot steam electromagnetic valve and the second hot steam electromagnetic valve are both in a closed state.

In this embodiment, the rate of decrease in the bank temperature may be detected in real time or intermittently during the cooling of the first cooling room and the second cooling room. When the temperature drop rate of a certain cold room is smaller than or equal to the temperature drop rate limiting value, the phenomenon that frost and ice are formed on the air cooler of the corresponding cold room can be indicated. Specifically, when the temperature between the cold rooms is reduced to a certain value, the temperature of the cold rooms is reduced slowly, and the reason may be that the fins of the evaporator are frosted, and the refrigerating efficiency is reduced. Therefore, in this case, the defrosting mode may be triggered to defrost the frost layer or the ice layer on the evaporator fins to improve the refrigerating efficiency. For example, in this embodiment, the second cooling chamber is triggered to enter the defrosting mode, at this time, the liquid refrigerant in the high temperature and high pressure state in the first compressor and the second compressor is directly introduced into the second air cooler through the pipeline and the second hot air solenoid valve to melt the frost layer and the ice layer on the evaporator of the second air cooler. The cooled liquid refrigerant sequentially passes through the second expansion valve, the second liquid supply electromagnetic valve, the first liquid supply electromagnetic valve and the first expansion valve to enter the first air cooler for heat exchange, so that refrigeration of the first cooling room is realized. It will be appreciated that when defrosting is required in the first compartment and refrigeration is required in the second compartment, the refrigerant may be moved in the opposite direction.

The above-described embodiments may include:

At some point, the user places goods into the first cold room and the second cold room. The heat of the goods is largely discharged, resulting in a great increase in the temperature of the warehouse. For example, the temperature is raised from the upper limit of the warehouse temperature to the upper limit of the warehouse temperature+the upper limit of the warehouse temperature. And the rate of the decrease in the bank temperature between the first cold room and the second cold room is greater than the bank temperature decrease rate limit. In this case, the first and second cold rooms are triggered to a rapid cooling mode in which both the first and second compressors enter a cooling mode to perform cooling on the first and second cold rooms.

When both the first cold room and the second cold room are in the quick refrigeration mode, the compressor controller adjusts the loading and unloading speed of the compressor and the capacity range of the compressor, so that both the first cold room and the second cold room are in the quick refrigeration mode.

Specifically, when the first cooling room and the second cooling room are both in the rapid cooling mode, first, one target compressor is selected from the first compressor and the second compressor, and the capacity modulation loading electromagnetic valve of the target compressor is controlled to be opened for a preset rapid loading time, and at this time, the target compressor executes rapid loading.

More specifically, the target compressor may be selected from one of the first compressor and the second compressor at random, or the shortest operation time compressor may be selected as the target compressor.

Then, when the target compressor is rapidly loaded to 50% load, forced holding is performed, that is, the load of the target compressor is held at 50%. And then opening a capacity-adjusting loading electromagnetic valve for controlling the other compressor for a preset quick loading time, and at the moment, the other compressor executes quick loading.

Finally, when the load of the other compressor is also loaded to 50% load, the first compressor and the second compressor are controlled to be both fast loaded to 100% load together.

After a few moments, when the first cooling room and the second cooling room drop to a certain degree, the temperature of the warehouse drops slowly, and the refrigerating efficiency is reduced due to frosting of the evaporator fins. Therefore, when the temperature drop rate of the first cold room or the second cold room is detected to be smaller than or equal to the limit value of the temperature drop rate, the corresponding defrosting mode is triggered. In this case the number of the elements to be formed is,

The first compressor and the second compressor may be turned on and off alternately (depending on the run time). When one air cooler is frosted, but the other air cooler is not frosted, the electromagnetic valve arranged on the pipeline can be controlled to directly input the refrigerant in the high-temperature and high-pressure state into the air cooler in the frosted state so as to melt the frost layer and the ice layer of the evaporator fins. Correspondingly (the fan can be controlled to rotate reversely to blow off water drops), and then the cooled refrigerant is input into the air cooler which is not in a frosting state to evaporate and absorb heat for refrigeration.

Under the condition that the first air cooler and the second air cooler are frosted, the first air cooler and the second air cooler can be frosted alternately.

After a plurality of moments, the first cooling room and the second cooling room enter a temperature maintaining stage, the change amplitude of the warehouse temperature is reduced, and at the moment, the upper warehouse temperature limit + the upper warehouse temperature limit > the warehouse temperature > the upper warehouse temperature limit. At the moment, the heat load is reduced, frequent start and stop are avoided, and a compressor can be used for cooling a cooling room. The first compressor and the second compressor may be controlled to perform a loading action and an unloading action during the maintenance temperature phase. When the loading action is executed, the compressor with the shortest running time is loaded to 50% of load in a climbing mode and then is forcedly maintained, and after the second compressor is loaded to 50% of load in a climbing mode, the two compressors are loaded to 100% of load together and rapidly. When the unloading action is executed, the two compressors can be simultaneously unloaded to 50% in a climbing way, and then the compressors with long running time are turned off. And the second compressor climbs to be unloaded to standby according to the load deviation.

According to an embodiment of the present invention, referring to fig. 4, there is provided a refrigeration control apparatus, which may include:

According to an embodiment of the present invention, an electronic device is provided, please refer to fig. 5. The electronic device in this embodiment may include one or more of the following components: a processor, a network interface, memory, non-volatile storage, and one or more application programs, wherein the one or more application programs may be stored in the non-volatile storage and configured to be executed by the one or more processors, the one or more program configured to perform the method as described in the foregoing method embodiments.

According to an embodiment of the present invention, there is provided a refrigerator including: which adopts the method provided in the above embodiment or includes the above electronic device.

According to an embodiment of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a computer, causes the computer to perform the method described in any of the above embodiments.

There is also provided, in accordance with an embodiment of the present invention, a computer program product containing instructions that, when executed by a computer, cause the computer to perform a method of performing a switching strategy in any of the above embodiments.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments, and this embodiment is not described herein.

The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.

Claims

1. A refrigeration control method, the method comprising:

2. The method according to claim 1, wherein the method further comprises:

When the unloading action is required to be executed, controlling the compressor unit to execute unloading at a stable unloading speed;

When the compressor set is unloaded to a first load threshold, stopping the non-target compressor and controlling the target compressor to unload to standby at a smooth unloading speed.

3. The method of claim 1, wherein the first load threshold is a load threshold greater than or equal to 50%.

4. A method according to any one of claims 1-3, wherein the operating state mode further comprises: and a defrosting mode, wherein the step of identifying the running state mode of the refrigeration house comprises the following steps:

Detecting the current temperature of the refrigeration house;

Judging whether the current temperature of the refrigeration house is greater than a first temperature threshold value;

Determining the current temperature dropping rate of the refrigeration house under the condition that the current refrigeration house temperature is larger than a first temperature threshold value;

Judging whether the current temperature reduction rate of the refrigeration house is smaller than or equal to a temperature reduction rate threshold value;

5. The method of claim 4, wherein in the event that the operational state mode is a defrost mode, the method further comprises:

When the operation state mode is a defrosting mode, controlling the at least two compressors to alternately operate and stop; controlling a refrigerant in the compressor unit to be directly input into the air cooler through a preset hot gas pipeline so as to at least melt a frost layer or an ice layer on an evaporator in the air cooler; wherein, the hot gas pipeline is the pipeline of intercommunication compressor unit and air-cooler.

6. The method of claim 5, wherein the step of controlling the at least two compressors to alternately operate and stop when the operation state mode is a defrosting mode and when the compressors are operated, comprises:

When the loading action is required to be executed, controlling the compressor to execute loading at a first loading speed;

7. The method of claim 4, wherein the operational state mode further comprises: and a rapid refrigeration mode, wherein the step of identifying the running state mode of the refrigeration house further comprises the following steps:

8. The method of claim 7, wherein in the event that the run state mode is a rapid cooling mode, the method further comprises:

Determining a target compressor from the at least two compressors;

Controlling the target compressor to execute loading at a second loading speed;

When the target compressor is loaded to a first load threshold value, controlling a non-target compressor to execute loading at a second loading speed; wherein when a non-target compressor performs loading, controlling a load of the target compressor to be maintained at the first load threshold;

and when the non-target compressor is loaded to the first load threshold, controlling the compressor unit to be loaded to the second load threshold at the second loading speed.

9. A refrigeration control apparatus, said apparatus comprising:

10. An electronic device, comprising:

A memory, and one or more processors communicatively coupled to the memory;

stored in the memory are instructions executable by the one or more processors to cause the one or more processors to implement the method of any one of claims 1 to 8.

11. A freezer, comprising: employing the method according to any one of claims 1-8 or comprising the electronic device according to claim 10.