Refrigerating unit defrosting method and device, refrigerating unit system and storage medium

Abstract

The invention relates to a refrigerating unit defrosting method and device, a refrigerating unit system and a storage medium. The method comprises the steps that frosting state parameters corresponding to each preset refrigerating unit can be detected; according to the frosting state parameters, a frosting degree index corresponding to the refrigerating unit is determined; in the refrigerating units with the frosting degree indexes larger than a preset frosting threshold value, the refrigerating unit with the maximum frosting degree index is determined to serve as a target refrigerating unit; in the remaining refrigerating units except the target refrigerating unit, the refrigerating unit with the minimum unit load is determined to serve as a heat source refrigerating unit; and communicating a bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, and controlling the heat source refrigerating unit to be switched to a defrosting mode, so that the heat source refrigerating unit defrosts the target refrigerating unit. Compared with the mode that a fixed defrosting interval is adopted, the refrigerating unit can be independently defrosted more flexibly, and the problem that defrosting is too early or too late, so that energy waste or refrigerating capacity attenuation is caused is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, and in particular to a defrosting method and device for a refrigerating unit, a refrigerating unit system and a storage medium. BACKGROUND

[0002] In a large refrigeration house, in order to meet the temperature control requirements of different storage areas, multiple refrigerating units are usually required to be independently operated. Since the types of goods stored in different areas of the refrigeration house are different, the operating states of the refrigerating units are different, and the temperature and humidity distributions in different areas are uneven, which causes the formation rate and accumulation degree of frost layers of the refrigerating units in different areas to be different. At present, a fixed defrosting cycle is generally used, that is, all the refrigerating units in the refrigeration house are defrosted synchronously every preset defrosting period. Although this can achieve the purpose of defrosting all the refrigerating units, the fixed defrosting cycle has poor flexibility and lacks adaptability to the actual frost layer accumulation degrees of different refrigerating units, and thus cannot obtain a better defrosting effect. This is because the frost layer thicknesses of different refrigerating units are different, and defrosting the refrigerating units with smaller frost layer thicknesses too early will cause energy waste, and defrosting the refrigerating units with larger frost layer thicknesses too late will cause refrigeration capacity decay and temperature fluctuation in the refrigeration house. SUMMARY

[0003] The present application provides a defrosting method and device for a refrigerating unit, a refrigerating unit system and a storage medium to solve the problem of poor flexibility and lack of adaptability to the actual frost layer accumulation degrees of different refrigerating units caused by using a fixed defrosting cycle.

[0004] To solve the above technical problems, the technical scheme of the present application is as follows:

[0005] The present application provides a defrosting method for a refrigerating unit, which comprises: detecting a frosting state parameter corresponding to each preset refrigerating unit; determining a frosting degree index corresponding to the refrigerating unit according to the frosting state parameter; determining a refrigerating unit with the largest frosting degree index as a target refrigerating unit among refrigerating units with frosting degree indexes greater than a preset frosting threshold; determining a refrigerating unit with the smallest unit load as a heat source refrigerating unit among the remaining refrigerating units except the target refrigerating unit; connecting a bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, and controlling the heat source refrigerating unit to switch to a defrosting mode, so as to defrost the target refrigerating unit by using the heat source refrigerating unit.

[0006] The detection of the frosting state parameter corresponding to the refrigerating unit comprises: detecting the environmental temperature and the environmental humidity of a refrigeration area corresponding to the refrigerating unit; and detecting the frosting thickness of an evaporator in the refrigerating unit.

[0007] The determination of the refrigerating unit with the maximum frosting degree index as the target refrigerating unit comprises: in the case that the refrigerating unit with the maximum frosting degree index is more than two, determining the article attribute corresponding to each refrigerating unit in the refrigerating units with the maximum frosting degree index; inquiring about the defrosting priority of the article attribute corresponding to each refrigerating unit; and taking the refrigerating unit corresponding to the highest defrosting priority as the target refrigerating unit.

[0008] The determination of the refrigerating unit with the minimum unit load comprises: detecting the compressor current of each refrigerating unit in the remaining refrigerating units other than the target refrigerating unit, and determining the refrigerating unit with the minimum compressor current as the refrigerating unit with the minimum unit load.

[0009] The connection of the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit and the control of the heat source refrigerating unit switching to the defrosting mode comprise: determining the article attribute corresponding to the target refrigerating unit; inquiring about the environmental sensitivity level of the article attribute corresponding to the target refrigerating unit; setting the defrosting parameter corresponding to the environmental sensitivity level according to the environmental sensitivity level of the article attribute corresponding to the target refrigerating unit; wherein the defrosting parameter at least comprises one of the following: the opening degree of the electronic expansion valve arranged on the bidirectional defrosting pipeline and the defrosting duration; the opening degree corresponding to the high environmental sensitivity level is smaller than the opening degree corresponding to the low environmental sensitivity level; the defrosting duration corresponding to the high environmental sensitivity level is longer than the defrosting duration corresponding to the low environmental sensitivity level; and connecting the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit and controlling the heat source refrigerating unit switching to the defrosting mode according to the defrosting parameter.

[0010] The method further comprises: monitoring the frosting degree index corresponding to the target refrigerating unit in the process of controlling the heat source refrigerating unit to defrost the target refrigerating unit; and blocking the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit and controlling the heat source refrigerating unit switching to the refrigerating mode when the frosting degree index corresponding to the target refrigerating unit is less than or equal to the frosting threshold.

[0011] The method further comprises: before connecting the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, connecting a bidirectional defrosting pipeline between any two refrigerating units; the bidirectional defrosting pipeline comprises a first defrosting pipeline and a second defrosting pipeline; the first defrosting pipeline is provided with a first electronic expansion valve; a first port of the first defrosting pipeline is connected to a first interface of an evaporator of one of the refrigerating units, and a second port of the first defrosting pipeline is connected to a first interface of an evaporator of another refrigerating unit; the outer wall of the first defrosting pipeline is adjacent to the surface of the evaporator of the another refrigerating unit; the second defrosting pipeline is provided with a second electronic expansion valve; a first port of the second defrosting pipeline is connected to a second interface of the evaporator of the one of the refrigerating units, and a second port of the second defrosting pipeline is connected to a second interface of the evaporator of the another refrigerating unit; the outer wall of the second defrosting pipeline is adjacent to the surface of the evaporator of the one of the refrigerating units.

[0012] The method further comprises: before connecting the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, connecting a bidirectional defrosting pipeline between any two refrigerating units; the bidirectional defrosting pipeline comprises a first defrosting pipeline and a second defrosting pipeline; the first defrosting pipeline is provided with a first electronic expansion valve; a first port of the first defrosting pipeline is connected to a first interface of an evaporator of one of the refrigerating units, and a second port of the first defrosting pipeline is connected to a first interface of an evaporator of another refrigerating unit; the outer wall of the first defrosting pipeline is adjacent to the surface of the evaporator of the another refrigerating unit; the second defrosting pipeline is provided with a second electronic expansion valve; a first port of the second defrosting pipeline is connected to a second interface of the evaporator of the one of the refrigerating units, and a second port of the second defrosting pipeline is connected to a second interface of the evaporator of the another refrigerating unit; the outer wall of the second defrosting pipeline is adjacent to the surface of the evaporator of the one of the refrigerating units.

[0013] The method further comprises: before connecting the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, connecting a bidirectional defrosting pipeline between any two refrigerating units; the bidirectional defrosting pipeline comprises a first defrosting pipeline and a second defrosting pipeline; the first defrosting pipeline is provided with a first electronic expansion valve; a first port of the first defrosting pipeline is connected to a first interface of an evaporator of one of the refrigerating units, and a second port of the first defrosting pipeline is connected to a first interface of an evaporator of another refrigerating unit; the outer wall of the first defrosting pipeline is adjacent to the surface of the evaporator of the another refrigerating unit; the second defrosting pipeline is provided with a second electronic expansion valve; a first port of the second defrosting pipeline is connected to a second interface of the evaporator of the one of the refrigerating units, and a second port of the second defrosting pipeline is connected to a second interface of the evaporator of the another refrigerating unit; the outer wall of the second defrosting pipeline is adjacent to the surface of the evaporator of the one of the refrigerating units.

[0014] The method further comprises: before connecting the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, connecting a bidirectional defrosting pipeline between any two refrigerating units; the bidirectional defrosting pipeline comprises a first defrosting pipeline and a second defrosting pipeline; the first defrosting pipeline is provided with a first electronic expansion valve; a first port of the first defrosting pipeline is connected to a first interface of an evaporator of one of the refrigerating units, and a second port of the first defrosting pipeline is connected to a first interface of an evaporator of another refrigerating unit; the outer wall of the first defrosting pipeline is adjacent to the surface of the evaporator of the another refrigerating unit; the second defrosting pipeline is provided with a second electronic expansion valve; a first port of the second defrosting pipeline is connected to a second interface of the evaporator of the one of the refrigerating units, and a second port of the second defrosting pipeline is connected to a second interface of the evaporator of the another refrigerating unit; the outer wall of the second defrosting pipeline is adjacent to the surface of the evaporator of the one of the refrigerating units.

[0015] Compared with the prior art, the above technical solution provided in the embodiments of the present application has the following advantages: the method provided in the embodiments of the present application can detect the frosting state parameter corresponding to each preset refrigerating unit; and according to the frosting state parameter, a frosting degree index corresponding to the refrigerating unit is determined; in the refrigerating units whose frosting degree indexes are greater than a preset frosting threshold, the refrigerating unit with the largest frosting degree index is determined as a target refrigerating unit; in the refrigerating units other than the target refrigerating unit, the refrigerating unit with the smallest unit load is determined as a heat source refrigerating unit; a bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit is connected, and the heat source refrigerating unit is controlled to switch to a defrosting mode, so that the heat source refrigerating unit defrosts the target refrigerating unit. Through determining the frosting degree index corresponding to each refrigerating unit respectively, the embodiments of the present application can dynamically evaluate the frost accumulation degree of each refrigerating unit, preferentially defrost the refrigerating unit with the strongest defrosting demand, prevent the refrigerating unit from causing a refrigeration capacity attenuation problem due to an excessively thick frost layer, and use the refrigerating unit with the smallest unit load to provide a heat source when defrosting, thereby maintaining the stability of the overall refrigeration capacity of the system. Compared with the defrosting mode with a fixed defrosting interval, the embodiments of the present application can defrost the refrigerating unit with a defrosting demand separately, the defrosting mode is more flexible, and the problem of energy waste or refrigeration capacity attenuation caused by defrosting too early or too late is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate one embodiment consistent with the present application and, together with the description, serve to explain the principles of the application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, simple introductions will be given below to the drawings needed to be used in the embodiments or the prior art descriptions. Obviously, for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

[0018] One or more embodiments are illustrated by way of example in the drawings that are for illustrative purposes only, and these example illustrations do not constitute limitations on the embodiments, elements with the same reference numerals in the drawings represent similar elements, and the drawings are not limited to scale unless otherwise specified.

[0019] Figure 1 A structural schematic diagram of a refrigerating unit system according to an embodiment of the present application;

[0020] Figure 2 A structural and connection relationship schematic diagram of a refrigerating unit according to an embodiment of the present application;

[0021] Figure 3 A flow chart of a defrosting method of a refrigeration unit according to an embodiment of the present application;

[0022] Figure 4 A structural diagram of a defrosting device of a refrigeration unit according to an embodiment of the present application;

[0023] Figure 5 A structural diagram of a defrosting device of a refrigeration unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0025] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the description of a particular example will not necessarily be repeated in the description of each example. Of course, they are only examples and the purpose is not to limit the present application. In addition, reference numerals and / or letters can be repeated in different examples in the present application. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings being discussed.

[0026] The embodiments of the present application provide a refrigeration unit system. As shown in Figure 1 A structural schematic diagram of a refrigeration unit system according to an embodiment of the present application is shown.

[0027] In the refrigeration unit system, a controller (not shown in the figure) is included, at least two refrigeration units (only three refrigeration units are shown schematically in the figure), and a two-way defrosting pipeline is connected between any two refrigeration units, and an electronic expansion valve is arranged on each two-way defrosting pipeline. Each refrigeration unit corresponds to a refrigeration area. Each refrigeration unit and each electronic expansion valve are respectively in communication connection with the controller and accept the control of the controller. Figure 1 Figure 1 The two-way defrosting pipeline between any two refrigeration units is used to connect the inlet and outlet of the evaporators of the two refrigeration units, and forms a loop between the two evaporators.

[0028] The electronic expansion valve arranged on the two-way defrosting pipeline between any two refrigeration units is used to adjust the on-off state of the two-way defrosting pipeline under the control of the controller. The on-off state includes: communication and blockage.

[0029] The electronic expansion valve arranged on the two-way defrosting pipeline between any two refrigeration units is used to adjust the on-off state of the two-way defrosting pipeline under the control of the controller. The on-off state includes: communication and blockage. ​

[0030] For any two refrigeration units, the controller can control the opening degree of the electronic expansion valve between the two refrigeration units, make the two-way defrosting pipe communicate the evaporator inlet and outlet of the two refrigeration units, and control one of the refrigeration units to switch to the defrosting state. In the case where one of the refrigeration units is in the defrosting state and the other is in the refrigeration state, the high-temperature refrigerant output by the compressor in the defrosting state flows into the refrigeration state through the two-way defrosting pipe, and when passing through the evaporator of the refrigeration state, the frost layer formed on the surface of the evaporator is defrosted, and the refrigerant after cooling flows back to the refrigeration unit in the defrosting state through the two-way defrosting pipe.

[0031] In order to make the refrigeration unit system more clear, the internal structure of the refrigeration unit and the connection relationship between the two refrigeration units are described below. Figure 2 The structure and connection relationship of the refrigeration unit according to an embodiment of the application are shown in the schematic diagram.

[0032] In each of the preset refrigeration units, at least includes: a compressor, a four-way reversing valve, a finned condenser, a liquid storage tank, a liquid supply stop valve, an evaporator, a suction stop valve, and a gas-liquid separator arranged between the four-way reversing valve and the variable frequency compressor. Wherein, the compressor can be a variable frequency compressor. The condenser can be a finned condenser.

[0033] A two-way defrosting pipe is arranged between any two of the refrigeration units. Wherein, the two-way defrosting pipe includes: a first defrosting pipe and a second defrosting pipe. Since the two-way defrosting pipe includes two sections, the number of electronic expansion valves arranged on the two-way defrosting pipe can be two.

[0034] The first electronic expansion valve is arranged on the first defrosting pipe, and the opening degree of the first electronic expansion valve is adjusted under the control of the controller; the first port of the first defrosting pipe is connected to the first interface of the evaporator of one of the refrigeration units, and the second port of the first defrosting pipe is connected to the first interface of the evaporator of the other refrigeration unit. Wherein, the outer wall of the first defrosting pipe is adjacent to the surface of the evaporator of the other refrigeration unit. Further, the outer wall of the first defrosting pipe is attached to the surface of the evaporator of the other refrigeration unit.

[0035] The second electronic expansion valve is arranged on the second defrosting pipeline and adjusts the opening degree under the control of the controller; the first port of the second defrosting pipeline is connected to the second interface of the evaporator of the one of the refrigeration units, and the second port of the second defrosting pipeline is connected to the second interface of the evaporator of the other of the refrigeration units; and the outer wall of the second defrosting pipeline is adjacent to the surface of the evaporator of the one of the refrigeration units.

[0036] Further, the controller can control the four-way reversing valve of the refrigeration unit to reverse so as to switch the refrigeration unit between the refrigeration mode and the defrosting mode. The defrosting mode can be a hot gas defrosting mode.

[0037] Further, the controller can control the opening degrees of the first electronic expansion valve and the second electronic expansion valve to be 0, indicating that the bidirectional defrosting pipeline is in a blocked state; and the controller can control the opening degrees of the first electronic expansion valve and the second electronic expansion valve to be greater than 0, indicating that the bidirectional defrosting pipeline is in a connected state. The controller controls the opening degrees of the first electronic expansion valve and the second electronic expansion valve to be consistent.

[0038] Further, based on the connection mode, the controller can simultaneously adjust the opening degrees of the two electronic expansion valves on the bidirectional defrosting pipeline to be greater than 0, and control the one of the refrigeration units to switch to the defrosting mode and the other of the refrigeration units to remain in the refrigeration mode. At this time, the refrigerants in the two refrigeration units form a circulation through the bidirectional defrosting pipeline, and the refrigeration unit in the defrosting mode provides refrigerants as a heat source to defrost the evaporator of the refrigeration unit in the refrigeration mode.

[0039] Reference Figure 2 As shown in the figure, when the refrigeration unit B defrosts the evaporator A of the refrigeration unit A, the circulation mode of the refrigerants is as follows:

[0040] When the refrigeration unit A is in the refrigeration mode, the sequence of the flow direction of the refrigerants is as follows: the compressor A, the four-way reversing valve A, the condenser A, the liquid storage tank A, the liquid supply stop valve A, the evaporator A, the suction stop valve A, the four-way reversing valve A, and the gas-liquid separator A, and then the refrigerants return to the compressor A. That is, the refrigeration unit A can remain in normal operation.

[0041] The refrigeration unit B is in the defrosting mode, the flow direction of the refrigerant is: compressor B, four-way reversing valve B, suction stop valve B, first defrosting pipeline (passing through evaporator A, i.e., the area that needs to be defrosted), second defrosting pipeline, liquid supply stop valve B, liquid storage tank B, condenser B, four-way reversing valve B, gas-liquid separator B, and then the refrigerant returns to the compressor B. Among them, the bidirectional defrosting pipeline plays a role in flow splitting, and in the refrigerant, part of it flows into the bidirectional defrosting pipeline, and the other part flows into the evaporator B. In this process, the high-temperature refrigerant output by the compressor B, the high-temperature refrigerant flows into the first defrosting pipeline through the four-way reversing valve B and the suction stop valve B, and when passing through the evaporator A, the heat of the high-temperature refrigerant is transferred to the frost layer on the surface of the evaporator A through the outer wall of the first defrosting pipeline, thereby melting the frost layer formed on the surface of the evaporator A.

[0042] The embodiment of the present application adds a gas-liquid separator at the inlet of the variable frequency compressor, which can prevent liquid refrigerant from entering the variable frequency compressor and causing liquid damage to the variable frequency compressor. During defrosting, the refrigeration unit as a heat source can reduce the speed of the compressor according to the preset speed adjustment value to avoid overheating or excessive pressure of the refrigerant. Moreover, a liquid storage tank is arranged in each refrigeration unit to cope with the instantaneous flow change of the refrigerant during defrosting.

[0043] Based on the above-mentioned refrigeration unit system, the embodiment of the present application provides a defrosting method for a refrigeration unit. The execution subject of the embodiment of the present application is the controller in the above-mentioned refrigeration unit system. The controller can be arranged in one of the refrigeration units or in a preset server. As shown in FIG. 1, it is a flow chart of the defrosting method for a refrigeration unit according to an embodiment of the present application. Figure 3

[0044] In step S310, for each preset refrigeration unit, the frosting state parameter corresponding to the refrigeration unit is detected, and the frosting degree index corresponding to the refrigeration unit is determined according to the frosting state parameter.

[0045] The frosting state parameter refers to an index parameter for measuring the frosting condition of the evaporator surface. The frosting state parameter includes, for example, temperature, humidity, and frost thickness.

[0046] The frosting degree index refers to an index parameter reflecting the frosting degree of the evaporator surface. The larger the frosting degree index, the more serious the frosting degree of the evaporator surface; the smaller the frosting degree index, the less serious the frosting degree of the evaporator surface.

[0047] In step S320, among the refrigeration units with the frosting degree index greater than the preset frosting threshold value, the refrigeration unit with the largest frosting degree index is determined as the target refrigeration unit.

[0048] ​The frosting threshold is used to measure whether the refrigeration unit needs to defrost. When the frosting degree index corresponding to the refrigeration unit is greater than the frosting threshold, it indicates that the refrigeration unit needs to defrost. When the frosting degree index corresponding to the refrigeration unit is less than or equal to the frosting threshold, it indicates that the refrigeration unit temporarily does not need to defrost.

[0049] The target refrigeration unit refers to the refrigeration unit that is about to start defrosting among the plurality of refrigeration units.

[0050] The refrigeration unit with the largest frosting degree index greater than the frosting threshold is the refrigeration unit with the strongest defrosting demand among the refrigeration units that need to defrost.

[0051] In step S330, among the remaining refrigeration units other than the target refrigeration unit, the refrigeration unit with the smallest unit load is determined as the heat source refrigeration unit.

[0052] The unit load is used to describe the current working intensity of the refrigeration unit. The greater the unit load, the greater the current working intensity of the refrigeration unit; the smaller the unit load, the smaller the current working intensity of the refrigeration unit.

[0053] The heat source refrigeration unit refers to the refrigeration unit that provides heat source for the target refrigeration unit during defrosting.

[0054] The refrigeration unit with the smallest unit load means that the refrigeration unit itself has low energy consumption. Selecting the refrigeration unit with the smallest unit load as the heat source refrigeration unit can reduce the impact of defrosting on the overall efficiency of the system and achieve efficient use of energy.

[0055] In step S340, a bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is connected, and the heat source refrigeration unit is controlled to switch to a defrosting mode, so that the heat source refrigeration unit defrosts the target refrigeration unit.

[0056] After connecting the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit and switching the heat source refrigeration unit to the defrosting mode, the refrigerant in the heat source refrigeration unit is allowed to flow bidirectionally in the heat source refrigeration unit and the target refrigeration unit, and the high-temperature refrigerant in the heat source refrigeration unit can transfer heat to the evaporator surface in the target refrigeration unit to melt the frost layer on the evaporator surface of the target refrigeration unit.

[0057] In the embodiments of the present application, for each preset refrigerating unit, the frosting state parameter corresponding to the refrigerating unit can be detected, and according to the frosting state parameter, the frosting degree index corresponding to the refrigerating unit is determined. In the refrigerating units whose frosting degree indexes are greater than a preset frosting threshold, the refrigerating unit with the largest frosting degree index is determined as a target refrigerating unit. In the refrigerating units other than the target refrigerating unit, the refrigerating unit with the smallest unit load is determined as a heat source refrigerating unit. The bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit is connected, and the heat source refrigerating unit is controlled to switch to a defrosting mode, so that the heat source refrigerating unit defrosts the target refrigerating unit. In the embodiments of the present application, the frosting degree index corresponding to each refrigerating unit is determined, so that the accumulation degree of the frost layer of each refrigerating unit can be dynamically evaluated, and the refrigerating unit with the strongest defrosting demand is defrosted preferentially, so that the problem of refrigerating capacity attenuation caused by the over-thick frost layer of the refrigerating unit can be prevented. In addition, when defrosting, the refrigerating unit with the smallest unit load is used as the heat source to maintain the stability of the overall refrigerating capacity of the system. Compared with the defrosting mode with a fixed defrosting interval, the defrosting mode of the embodiments of the present application is more flexible, and the problems of energy waste and refrigerating capacity attenuation caused by defrosting too early or too late can be avoided.

[0058] In order to make the embodiments of the present application clearer, the defrosting method of the refrigerating unit in the embodiments of the present application will be further described below.

[0059] Since the ambient temperature and the ambient humidity can also affect the formation and growth rate of the frost layer, it is insufficient to comprehensively evaluate the frosting degree of the refrigerating unit only by relying on the frost layer thickness. Therefore, when determining the frosting degree index, the embodiments of the present application combine the ambient temperature and the ambient humidity and other parameters to comprehensively evaluate the severity of the frosting.

[0060] Specifically, for each refrigerating unit in the refrigerating unit system, the ambient temperature and the ambient humidity of the refrigerating area corresponding to the refrigerating unit can be detected, the frost layer thickness of the evaporator in the refrigerating unit is detected, and according to the ambient temperature, the ambient humidity and the frost layer thickness, the frosting degree index corresponding to the refrigerating unit is determined.

[0061] Further, a temperature sensor, a humidity sensor and a frost layer thickness sensor can be arranged in each refrigerating unit. The temperature sensor is used to detect the ambient temperature of the refrigerating area corresponding to the refrigerating unit. The humidity sensor is used to detect the ambient humidity of the refrigerating area corresponding to the refrigerating unit. The frost layer thickness sensor is used to detect the frost layer thickness of the frost layer on the surface of the evaporator in the refrigerating unit.

[0062] For example, the following formula can be used to determine the frosting degree index corresponding to the refrigerating unit:

[0063] S = a * (T - T0) + b * (H - H0) + c * D;

[0064] Wherein, S represents the frost degree index; T represents the ambient temperature; H represents the ambient humidity; D represents the frost layer thickness; a, b and c are preset weight coefficients respectively, a, b and c can be empirical values or values calibrated according to experimental data; T0 is the reference temperature, and H0 is the reference humidity. T0 and H0 respectively refer to the temperature and humidity of the refrigeration area under standard environment.

[0065] Further, when a, b and c are determined through experiments, experiments can be performed under different ambient temperatures, ambient humidities and frost layer thicknesses, actual observation values of the frost degree index are recorded, and then a least square method or other regression analysis method is used to fit the experimental data, and finally a, b and c can be obtained.

[0066] In the embodiments of the present application, after the frost degree index corresponding to each refrigeration unit is determined, the target refrigeration unit to be defrosted in each refrigeration unit can be determined according to the frost degree index corresponding to each refrigeration unit.

[0067] Further, in each refrigeration unit, the refrigeration unit with a frost degree index greater than a preset frost threshold value can be determined as the refrigeration unit to be defrosted; and the refrigeration unit with the largest frost degree index in the determined refrigeration unit to be defrosted is determined as the target refrigeration unit.

[0068] Since the refrigeration unit with heavy frost cannot be defrosted in time, it may lead to a decrease in refrigeration efficiency, and even affect the quality of the stored goods in the refrigeration area. Therefore, in order to ensure the efficient operation of the refrigeration unit, the embodiments of the present application prefer to start defrosting on the refrigeration unit with a high frost degree index, that is, after the frost degree index corresponding to each refrigeration unit is determined, the refrigeration unit with the largest frost degree index in the refrigeration unit with a frost degree index greater than a preset frost threshold value is determined as the target refrigeration unit, so as to defrost the target refrigeration unit. The embodiments of the present application adopt the mode of defrosting one refrigeration unit at a time, which can avoid the problem of increasing power load caused by simultaneous defrosting of multiple refrigeration units, and if multiple refrigeration units are defrosted at the same time, it may cause large temperature fluctuations in each refrigeration area, affecting the safety of the stored goods.

[0069] Further, after determining the frosting degree indexes corresponding to the respective refrigeration units, it is possible that the frosting degree indexes of two or more refrigeration units are the same, especially, it is possible that the frosting degree indexes of two or more refrigeration units are the same and the frosting degree index is the maximum among the determined frosting degree indexes. Therefore, in the case that the refrigeration units with the maximum frosting degree index are two or more, the corresponding article attribute of each refrigeration unit is determined among the refrigeration units with the maximum frosting degree index; the defrosting priority of the article attribute corresponding to each refrigeration unit is queried; and the refrigeration unit corresponding to the highest defrosting priority is taken as the target refrigeration unit.

[0070] The article attribute refers to the type of the article stored in the refrigeration area corresponding to the refrigeration unit. The article attribute includes but is not limited to high-humidity-sensitivity article, high-heat-capacity article and ordinary article.

[0071] The defrosting priority corresponding to the article attribute is used to measure the degree of influence of the frosting degree on the article. Since frosting can cause environmental changes, the defrosting priority can also measure the degree of influence of the environmental changes on the article of the article attribute. The higher the defrosting priority, the greater the degree of influence of the environmental changes on the article of the article attribute; the lower the defrosting priority, the smaller the degree of influence of the environmental changes on the article of the article attribute.

[0072] Further, since the frosting of the evaporator surface of the refrigeration unit affects the refrigeration efficiency of the refrigeration unit, and further affects the environmental temperature and humidity of the refrigeration area corresponding to the refrigeration unit, in the case that the change of the environmental temperature and humidity has a greater influence on the article stored in the refrigeration area under the same frosting degree index, the refrigeration unit of the refrigeration area can be defrosted first; in the case that the change of the environmental temperature and humidity has a smaller influence on the article stored in the refrigeration area, the refrigeration unit of the refrigeration area can be defrosted later.

[0073] For example, in the order of the defrosting priority from high to low, the article attributes are high-humidity-sensitivity article, high-heat-capacity article and ordinary article in turn.

[0074] The high-humidity-sensitivity article includes but is not limited to medicine and fresh food. The high-humidity-sensitivity article is very sensitive to slight changes in humidity, and humidity fluctuations can cause deterioration or failure.

[0075] The high-heat-capacity article includes but is not limited to frozen meat. The high-heat-capacity article is sensitive to temperature fluctuations, and slight temperature fluctuations can affect the texture of the article, but usually do not immediately cause irreversible damage.

[0076] The ordinary article includes but is not limited to packaging materials and dry food.

[0077] Therefore, in determining the defrosting priority, the high-humidity-sensitive items are prioritized over the high-heat-capacity items, and the high-heat-capacity items are prioritized over the ordinary items.

[0078] Further, in storing the items in the cold storage, in order to facilitate the regulation of different refrigeration environments, different items with different attributes are generally stored in different refrigeration areas, and items with the same attribute are stored in the same refrigeration area. Based on this, the embodiments of the present application can set an RFID (Radio Frequency Identification) tag for each refrigeration area or each item in advance. The RFID tag stores a unique identifier and storage location data. The unique identifier is unique. The unique identifier has a corresponding relationship with the attribute of the item, and the attribute of the item can be identified based on the unique identifier. The storage location data can be positioning data, a label of a refrigeration area, or a label of a refrigeration unit. According to the storage location data, the refrigeration area where the item is stored and the refrigeration unit corresponding to the refrigeration area can be determined. In this way, in determining the attribute of the item corresponding to each refrigeration unit, an RFID reader can be used to read each RFID tag to obtain the corresponding stored unique identifier and storage location data in each RFID tag; the attribute of the item is identified according to the unique identifier; the refrigeration unit corresponding to the refrigeration area where the item is located is determined according to the storage location data; a corresponding relationship is established between the refrigeration unit and the attribute of the item, and then the attribute of the item corresponding to each refrigeration unit is determined according to the corresponding stored unique identifier and storage location data, and the target refrigeration unit that needs to be defrosted in priority is determined according to the defrosting priority corresponding to the attribute of the item.

[0079] In the embodiments of the present application, after the target refrigeration unit is determined, the refrigeration unit with the smallest unit load among the remaining refrigeration units other than the target refrigeration unit can be determined as the heat source refrigeration unit.

[0080] Specifically, among the remaining refrigeration units other than the target refrigeration unit, the compressor current of each refrigeration unit is detected, and the refrigeration unit with the smallest compressor current is determined as the refrigeration unit with the smallest unit load.

[0081] Further, a current sensor is arranged on the compressor of each refrigeration unit. When the compressor is running, its current will change with the change of the unit load. The larger the unit load, the higher the current required by the compressor; the smaller the unit load, the smaller the current required by the compressor. Therefore, by monitoring the current of the compressor, the unit load condition can be understood in real time, and when the target refrigeration unit needs to be defrosted, the refrigeration unit with the smallest unit load is determined as the heat source refrigeration unit.

[0082] The reason why the embodiment of the present application selects the refrigeration unit with low load to defrost the refrigeration unit with high frost degree index is that low load means low current refrigeration demand or that the temperature of the refrigeration area served has reached the set value. At this time, the operation pressure of the refrigeration unit with low load is small, and the refrigeration unit can utilize the excess refrigeration capacity to assist other refrigeration units to defrost, thereby improving the energy utilization efficiency.

[0083] In the embodiment of the present application, after the target refrigeration unit and the heat source refrigeration unit are determined, the bi-directional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is connected, and the heat source refrigeration unit is controlled to switch to the defrosting mode to defrost the target refrigeration unit.

[0084] The electronic expansion valve arranged on the bi-directional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is controlled to adjust the opening degree to be greater than 0, so that the bi-directional defrosting pipeline is in a connected state, and the heat source refrigeration unit is switched from the refrigeration mode to the defrosting mode. At this time, the high-temperature refrigerant in the heat source refrigeration unit flows to the target refrigeration unit through the bi-directional defrosting pipeline, and when passing through the evaporator of the target refrigeration unit, the heat is transferred to the frost layer on the surface of the evaporator through the bi-directional defrosting pipeline, so that the frost layer on the surface of the evaporator is melted.

[0085] Specifically, before the bi-directional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is connected, the corresponding article attribute of the target refrigeration unit can be determined; the environmental sensitivity level of the corresponding article attribute of the target refrigeration unit is queried; and the defrosting parameter corresponding to the environmental sensitivity level is set according to the environmental sensitivity level of the corresponding article attribute of the target refrigeration unit. The defrosting parameter at least includes one of the opening degree of the electronic expansion valve arranged on the bi-directional defrosting pipeline and the defrosting time length. The opening degree corresponding to the high environmental sensitivity level is smaller than the opening degree corresponding to the low environmental sensitivity level, and the defrosting time length corresponding to the high environmental sensitivity level is greater than the defrosting time length corresponding to the low environmental sensitivity level. The bi-directional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit can be connected according to the defrosting parameter, and the heat source refrigeration unit is controlled to switch to the defrosting mode.

[0086] The environmental sensitivity level of the article attribute refers to the sensitivity of the article attribute to the environmental temperature and humidity. The environmental sensitivity level and the defrosting priority are similar, and both can reflect the influence of the environmental temperature and humidity on the article. The higher the environmental sensitivity level, the more likely the quality of the article is affected by the change of the environmental temperature and humidity; the lower the environmental sensitivity level, the less likely the quality of the article is affected by the change of the environmental temperature and humidity.

[0087] The opening degree of the electronic expansion valve is used to regulate and control the refrigerant flow in the bi-directional defrosting pipeline.

[0088] The defrosting duration refers to the time length from switching the heat source refrigeration unit to the defrosting mode to switching the heat source refrigeration unit to the refrigeration mode.

[0089] Further, the corresponding defrosting parameters can be set in advance for each environment sensitivity level.

[0090] Further, since different item attributes have different sensitivities to the environment temperature and humidity, the item attribute corresponding to the target refrigeration unit can be determined, the environment sensitivity level of the item attribute corresponding to the target refrigeration unit is queried, and the electronic expansion valve arranged on the bidirectional defrosting pipeline is adjusted to the opening degree corresponding to the environment sensitivity level.

[0091] Further, in addition to adjusting the electronic expansion valve arranged on the bidirectional defrosting pipeline to the opening degree corresponding to the environment sensitivity level, the defrosting duration of this time can also be set as the defrosting duration corresponding to the environment sensitivity level, and then the on-off state of the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit and the switching of the heat source refrigeration unit between the refrigeration mode and the defrosting mode can be adjusted according to the defrosting parameters.

[0092] The item attributes include, but are not limited to, high humidity sensitivity items, high heat capacity items, and ordinary items. The environment sensitivity levels of the item attributes are high humidity sensitivity items, high heat capacity items, and ordinary items from high to low.

[0093] High humidity sensitivity items (such as medicines, fresh foods, etc.) are more sensitive to changes in environmental humidity and require a more stable humidity environment. During the defrosting process, the humidity of high humidity sensitivity items needs to be controlled to avoid affecting the quality of the items due to humidity fluctuations. For high humidity sensitivity items, the flow rate of the refrigerant can be appropriately reduced to reduce the flow speed of the refrigerant on the evaporator surface. Reducing the flow rate of the refrigerant can reduce the humidity fluctuations caused by the rapid flow of the refrigerant and maintain the stability of the humidity. In addition, for high humidity sensitivity items, the defrosting time can be appropriately extended to ensure that the frost layer is completely melted and to reduce the dramatic impact on humidity. Extending the defrosting time can avoid the rapid rise in humidity caused by rapid heating and maintain the stability of the humidity of the storage environment.

[0094] High-heat-capacity items need to absorb or release more heat when the temperature changes. During the defrosting process, a more gentle heating method is needed to avoid temperature changes affecting the quality of the items. For high-heat-capacity items, reducing the flow rate of the refrigerant appropriately can reduce the flow speed of the refrigerant on the evaporator surface. Reducing the flow rate of the refrigerant can prolong the melting time of the frost layer, allowing heat to be transferred more evenly to the items, avoiding a sudden temperature rise. In addition, for high-heat-capacity items, appropriately extending the defrosting time can ensure that the frost layer is completely melted while reducing the thermal shock on the items, and extending the defrosting time can avoid temperature fluctuations caused by rapid heating, maintaining the stability of the storage environment.

[0095] For example: Determine the attribute information of the items stored in the refrigeration area corresponding to the target refrigeration unit (such as high-humidity-sensitive items, high-heat-capacity items, ordinary items, etc.), and adjust the defrosting parameters (such as the flow rate of the refrigerant and the defrosting time, etc.) according to the corresponding environmental sensitivity level. In this way, when the item is determined to be an ordinary item, the defrosting parameters are: opening degree of 60%, defrosting time of 10 minutes. When the item is determined to be a high-heat-capacity item, the defrosting parameters are: opening degree of 50%, defrosting time of 10 minutes. When the item is determined to be a high-humidity-sensitive item, the defrosting parameters are: opening degree of 40%, defrosting time of 20 minutes. Compared with high-heat-capacity items, high-humidity-sensitive items have a larger adjustment range for refrigerant flow rate and defrosting time, because humidity fluctuations have a more direct and more serious impact on high-humidity-sensitive items, which can cause the items to deteriorate or fail. Reducing the flow rate of the refrigerant can slow down the evaporation speed of the frost layer on the evaporator surface, allowing the evaporator surface temperature to rise more slowly, reducing the generation of condensed water, avoiding the condensation (dew) of water vapor in the air on the surface, thereby reducing the sudden increase in humidity and avoiding damage to the quality of the items due to excessive humidity. Accordingly, reducing the flow rate of the refrigerant slows down the melting speed of the frost layer, and a longer defrosting time is needed to melt the frost layer.

[0096] In the embodiments of the present application, a defrosting exit mechanism can be provided.

[0097] Specifically, during the process of controlling the heat source refrigeration unit to defrost the target refrigeration unit, the frost degree index corresponding to the target refrigeration unit can be monitored; when the frost degree index corresponding to the target refrigeration unit is less than or equal to the threshold value, the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is blocked, and the heat source refrigeration unit is controlled to switch to a refrigeration mode.

[0098] Further, the frost degree index corresponding to the target refrigeration unit can be monitored during the process of controlling the heat source refrigeration unit to defrost the target refrigeration unit; before the defrosting duration ends, if it is monitored that the frost degree index corresponding to the target refrigeration unit is less than or equal to the threshold value, the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is blocked, and the heat source refrigeration unit is controlled to switch to the refrigeration mode; after the defrosting duration ends, if it is monitored that the frost degree index corresponding to the target refrigeration unit is still greater than the threshold value, the defrosting duration is further extended, the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is kept connected, and the heat source refrigeration unit is kept in the defrosting mode, and the frost degree index corresponding to the target refrigeration unit is continuously monitored until the frost degree index corresponding to the target refrigeration unit is less than or equal to the threshold value.

[0099] The refrigeration unit system of the embodiment of the present application comprises a plurality of refrigeration units, each refrigeration unit corresponding to a refrigeration area, and the refrigeration units can defrost each other through the shared bidirectional defrosting pipeline, so that the defrosting time and mode can be dynamically adjusted, the operation efficiency and energy saving performance of the cold storage are significantly improved, the maintenance cost is reduced, and the safety and quality of the goods are ensured.

[0100] The embodiment of the present application can select the refrigeration unit with low load to start the defrosting process of the refrigeration unit with high frost degree index according to the environmental parameters (such as temperature and humidity) of different refrigeration areas, the frost layer thickness of the evaporator surface in each refrigeration unit, and the load condition of each refrigeration unit, reasonably allocate the defrosting task, and avoid energy waste caused by simultaneous defrosting of multiple refrigeration units.

[0101] The embodiment of the present application can dynamically adjust the defrosting parameters (such as adjusting the circulation flow of refrigerant and defrosting time) of different refrigeration areas according to the attributes (such as heat capacity and humidity sensitivity) of the goods stored in different refrigeration areas, and ensure the safety and quality of the stored goods.

[0102] The embodiment of the present application also provides a refrigeration unit defrosting device. As shown in Figure 4 The refrigeration unit defrosting device according to the embodiment of the present application is shown in the structural diagram.

[0103] The refrigeration unit defrosting device comprises:

[0104] The data detection module 410 is configured to detect the frost state parameter corresponding to each preset refrigeration unit, and determine the frost degree index corresponding to the refrigeration unit according to the frost state parameter.

[0105] The first determination module 420 is configured to determine, among the refrigerating units whose frosting degree indexes are greater than the preset frosting threshold, a refrigerating unit with the largest frosting degree index as a target refrigerating unit.

[0106] The second determination module 430 is configured to determine, among the remaining refrigerating units except the target refrigerating unit, a refrigerating unit with the smallest unit load as a heat source refrigerating unit.

[0107] The defrosting control module 440 is configured to connect a bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, and control the heat source refrigerating unit to switch to a defrosting mode, so that the heat source refrigerating unit defrosts the target refrigerating unit.

[0108] The functions of the apparatuses described in the embodiments of the present application have been described in the foregoing method embodiments, and thus the descriptions of the embodiments of the present application are not elaborated herein.

[0109] The embodiments of the present application further provide a refrigerating unit system. Figure 5 As shown in FIG. 5, it is a structural diagram of a refrigerating unit system according to an embodiment of the present application.

[0110] The refrigerating unit system comprises a processor 510, a communication interface 520, a memory 530 and a communication bus 540. The processor 510, the communication interface 520 and the memory 530 communicate with each other through the communication bus 540. The memory 530 is configured to store a computer program. Further, the processor 510, the communication interface 520, the memory 530 and the communication bus 540 can be arranged in a controller of the refrigerating unit system.

[0111] In an embodiment of the present application, the processor 510 is configured to execute the program stored in the memory 530, and implement the defrosting method of the refrigerating unit provided by any one of the foregoing method embodiments, including: detecting, for each preset refrigerating unit, a frosting state parameter corresponding to the refrigerating unit; determining, according to the frosting state parameter, a frosting degree index corresponding to the refrigerating unit; determining, among the refrigerating units whose frosting degree indexes are greater than a preset frosting threshold, a refrigerating unit with the largest frosting degree index as a target refrigerating unit; determining, among the remaining refrigerating units except the target refrigerating unit, a refrigerating unit with the smallest unit load as a heat source refrigerating unit; connecting a bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit, and controlling the heat source refrigerating unit to switch to a defrosting mode, so that the heat source refrigerating unit defrosts the target refrigerating unit.

[0112] The detection of the frosting state parameter corresponding to the refrigerating unit comprises: detecting the environmental temperature and the environmental humidity of a refrigeration area corresponding to the refrigerating unit; and detecting the frosting thickness of an evaporator in the refrigerating unit.

[0113] The determination of the refrigerating unit with the maximum frosting degree index as the target refrigerating unit comprises: in the case that the refrigerating unit with the maximum frosting degree index is more than two, determining the article attribute corresponding to each refrigerating unit in the refrigerating units with the maximum frosting degree index; inquiring about the defrosting priority of the article attribute corresponding to each refrigerating unit; and taking the refrigerating unit corresponding to the highest defrosting priority as the target refrigerating unit.

[0114] The determination of the refrigerating unit with the minimum unit load comprises: detecting the compressor current of each refrigerating unit in the remaining refrigerating units other than the target refrigerating unit, and determining the refrigerating unit with the minimum compressor current as the refrigerating unit with the minimum unit load.

[0115] The connection of the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit and the control of the heat source refrigerating unit switching to the defrosting mode comprise: determining the article attribute corresponding to the target refrigerating unit; inquiring about the environmental sensitivity level of the article attribute corresponding to the target refrigerating unit; setting the defrosting parameter corresponding to the environmental sensitivity level according to the environmental sensitivity level of the article attribute corresponding to the target refrigerating unit; wherein the defrosting parameter at least comprises one of the following: the opening degree of the electronic expansion valve arranged on the bidirectional defrosting pipeline and the defrosting duration; the opening degree corresponding to the high environmental sensitivity level is smaller than the opening degree corresponding to the low environmental sensitivity level; the defrosting duration corresponding to the high environmental sensitivity level is longer than the defrosting duration corresponding to the low environmental sensitivity level; and connecting the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit and controlling the heat source refrigerating unit switching to the defrosting mode according to the defrosting parameter.

[0116] The method further comprises: monitoring the frosting degree index corresponding to the target refrigerating unit in the process of controlling the heat source refrigerating unit to defrost the target refrigerating unit; and blocking the bidirectional defrosting pipeline between the heat source refrigerating unit and the target refrigerating unit and controlling the heat source refrigerating unit switching to the refrigerating mode when the frosting degree index corresponding to the target refrigerating unit is less than or equal to the frosting threshold.

[0117] Before the two-way defrosting pipeline connecting the heat source refrigerating unit and the target refrigerating unit, further comprising: setting a two-way defrosting pipeline between any two refrigerating units; wherein the two-way defrosting pipeline comprises: a first defrosting pipeline and a second defrosting pipeline; a first electronic expansion valve is arranged on the first defrosting pipeline; a first port of the first defrosting pipeline is connected to a first interface of an evaporator of one of the refrigerating units, and a second port of the first defrosting pipeline is connected to a first interface of an evaporator of another refrigerating unit; wherein the outer wall of the first defrosting pipeline is adjacent to the surface of the evaporator of the another refrigerating unit; a second electronic expansion valve is arranged on the second defrosting pipeline; a first port of the second defrosting pipeline is connected to a second interface of the evaporator of the one of the refrigerating units, and a second port of the second defrosting pipeline is connected to a second interface of the evaporator of the another refrigerating unit; wherein the outer wall of the second defrosting pipeline is adjacent to the surface of the evaporator of the one of the refrigerating units.

[0118] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the defrosting method of the refrigerating unit provided by any one of the preceding method embodiments. Since the defrosting method of the refrigerating unit has been described in detail above, the description of the present embodiment will not be elaborated, and the related description in the preceding embodiments can be referred to.

[0119] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment.

[0120] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software plus a general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0121] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0122] The above description is that of current embodiments of the application. Various modifications and changes can be made thereto without departing from the spirit and scope of the application as set forth. The scope of the application is not to be limited to the exact details shown above.

Claims

1. A defrosting method for a refrigeration unit, characterized in that, The method comprises the following steps: For each preset refrigeration unit, detecting a frosting state parameter corresponding to the refrigeration unit; and determining a frosting degree index corresponding to the refrigeration unit according to the frosting state parameter; Among the refrigeration units whose frosting degree indexes are greater than a preset frosting threshold, determining the refrigeration unit with the largest frosting degree index as a target refrigeration unit; Among the refrigeration units other than the target refrigeration unit, determining the refrigeration unit with the smallest unit load as a heat source refrigeration unit; Connecting a bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit, and controlling the heat source refrigeration unit to switch to a defrosting mode, so that the heat source refrigeration unit defrosts the target refrigeration unit.

2. The method of claim 1, wherein, The detection of the frosting state parameter corresponding to the refrigeration unit and the determination of the frosting degree index corresponding to the refrigeration unit according to the frosting state parameter comprise the following steps: Detecting an ambient temperature and an ambient humidity of a refrigeration area corresponding to the refrigeration unit; Detecting a frosting thickness corresponding to an evaporator in the refrigeration unit; Determining the frosting degree index corresponding to the refrigeration unit according to the ambient temperature, the ambient humidity, and the frosting thickness.

3. The method of claim 1, wherein, The determination of the refrigeration unit with the largest frosting degree index as the target refrigeration unit comprises the following steps: In the case that the refrigeration unit with the largest frosting degree index is more than two, determining an article attribute corresponding to each refrigeration unit among the refrigeration units with the largest frosting degree index; Inquiring a defrosting priority of the article attribute corresponding to each refrigeration unit; Taking the refrigeration unit corresponding to the highest defrosting priority as the target refrigeration unit.

4. The method of claim 1, wherein, The determination of the refrigeration unit with the smallest unit load comprises the following steps: Among the refrigeration units other than the target refrigeration unit, detecting a compressor current of each refrigeration unit, and determining the refrigeration unit with the smallest compressor current as the refrigeration unit with the smallest unit load.

5. The method of claim 1, wherein, The connection of the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit and the control of the heat source refrigeration unit to switch to the defrosting mode comprise the following steps: Determining an article attribute corresponding to the target refrigeration unit; Inquiring an environmental sensitivity level of the article attribute corresponding to the target refrigeration unit; According to the environmental sensitivity level of the article attribute corresponding to the target refrigeration unit, setting a defrosting parameter corresponding to the environmental sensitivity level; wherein the defrosting parameter at least comprises one of the following: an opening degree of an electronic expansion valve arranged on the bidirectional defrosting pipeline and a defrosting time length; the opening degree corresponding to a high environmental sensitivity level is smaller than the opening degree corresponding to a low environmental sensitivity level; the defrosting time length corresponding to the high environmental sensitivity level is longer than the defrosting time length corresponding to the low environmental sensitivity level; According to the defrosting parameter, connecting the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit, and controlling the heat source refrigeration unit to switch to the defrosting mode.

6. The method of claim 1, wherein, The method further comprises the following steps: During the control of the heat source refrigeration unit to defrost the target refrigeration unit, monitoring the frosting degree index corresponding to the target refrigeration unit; When the frost degree index corresponding to the target refrigeration unit is less than or equal to the frost threshold, the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is blocked, and the heat source refrigeration unit is controlled to switch to the refrigeration mode.

7. The method according to any one of claims 1 to 6, characterized in that, Before the bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit is connected, further comprising: A bidirectional defrosting pipeline is arranged between any two refrigeration units; wherein the bidirectional defrosting pipeline comprises a first defrosting pipeline and a second defrosting pipeline; A first electronic expansion valve is arranged on the first defrosting pipeline; a first port of the first defrosting pipeline is connected to a first interface of an evaporator of one of the refrigeration units, and a second port of the first defrosting pipeline is connected to a first interface of an evaporator of another refrigeration unit; wherein the outer wall of the first defrosting pipeline is adjacent to the surface of the evaporator of the another refrigeration unit; A second electronic expansion valve is arranged on the second defrosting pipeline; a first port of the second defrosting pipeline is connected to a second interface of the evaporator of the one refrigeration unit, and a second port of the second defrosting pipeline is connected to a second interface of the evaporator of the another refrigeration unit; wherein the outer wall of the second defrosting pipeline is adjacent to the surface of the evaporator of the one refrigeration unit.

8. A defrosting device for a refrigeration unit, comprising: Comprising: A data detection module for detecting, for each predetermined refrigeration unit, a frost state parameter corresponding to the refrigeration unit; and determining, according to the frost state parameter, a frost degree index corresponding to the refrigeration unit; A first determination module for determining, among refrigeration units with a frost degree index greater than a predetermined frost threshold, a refrigeration unit with the largest frost degree index as a target refrigeration unit; A second determination module for determining, among the remaining refrigeration units other than the target refrigeration unit, a refrigeration unit with the smallest unit load as a heat source refrigeration unit; A defrosting control module for connecting a bidirectional defrosting pipeline between the heat source refrigeration unit and the target refrigeration unit, and controlling the heat source refrigeration unit to switch to a defrosting mode, so that the heat source refrigeration unit defrosts the target refrigeration unit.

9. A refrigeration unit system, comprising: Comprising: At least one communication interface; At least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; At least one memory connected to the at least one bus, wherein the processor is configured to execute a refrigeration unit defrosting program stored in the memory to implement the refrigeration unit defrosting method of any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer executable instructions, which are executed to implement the refrigeration unit defrosting method of any one of claims 1-7.

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