A control method and device of a refrigerating unit and the refrigerating unit

Abstract

The application relates to a control method and device of a refrigerating unit and the refrigerating unit, and belongs to the technical field of refrigerating units. Frosting information of the refrigerating unit is acquired; if the frosting information meets preset defrosting and ice melting conditions, for each flow path of an evaporating side of the refrigerating unit, a corresponding outlet temperature difference of the flow path is calculated; based on the corresponding outlet temperature difference of each flow path, a corresponding defrosting and ice melting grade of the flow path is determined; and the defrosting and ice melting of each flow path of the evaporating side of the refrigerating unit is controlled in order from low to high of the defrosting and ice melting grades. Through the application, the operation reliability and use safety of the refrigerating unit are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of refrigeration units, and particularly relates to a control method and device of a refrigeration unit and the refrigeration unit. BACKGROUND

[0002] At present, with the progress of science and technology and the development of life, people have more and more preservation needs for seafood, meat products and other foods. In response to this, various types of refrigeration units have emerged to refrigerate and preserve these foods. The refrigeration units here include commercial large refrigeration units, household small refrigeration units and the like.

[0003] In practice, it is found that when a refrigeration unit is used for low-temperature refrigeration, there is a phenomenon of frosting and icing, which affects the refrigeration of the unit and further leads to poor preservation effect of goods. In response to this, defrosting and ice melting need to be performed on the refrigeration unit. However, if the indoor unit of the refrigeration unit has a serious icing problem, it will lead to low pressure of the refrigeration unit, and in the process of defrosting and ice melting, ice blocks may fall, thereby causing damage to the refrigeration unit and safety hazards. It can be seen that there is an urgent need for an intelligent control method for defrosting and ice melting of the refrigeration unit to improve the operation reliability and use safety of the refrigeration unit.

[0004] At present, no effective solution has been proposed for the above problems. SUMMARY

[0005] Therefore, the application provides a control method and device of a refrigeration unit and the refrigeration unit, which helps to improve the operation reliability and use safety of the refrigeration unit.

[0006] To achieve the above object, the application adopts the following technical solutions:

[0007] In a first aspect, the application provides a control method of a refrigeration unit, which comprises:

[0008] obtaining frosting information of the refrigeration unit;

[0009] if the frosting information meets a preset defrosting and ice melting condition, calculating a temperature difference of each flow path on the evaporating side of the refrigeration unit corresponding to the flow path;

[0010] determining a defrosting and ice melting grade of each flow path based on the temperature difference of the flow path corresponding to the flow path; wherein the smaller the temperature difference of the flow path, the lower the defrosting and ice melting grade of the flow path;

[0011] controlling defrosting and ice melting of each flow path on the evaporating side of the refrigeration unit in order from low to high according to the defrosting and ice melting grade.

[0012] Further, the frosting information includes frosting thickness and frosting area; and

[0013] The method further comprises:

[0014] If the frost thickness is greater than or equal to the preset thickness threshold value, and the frost area is greater than or equal to the preset area threshold value, it is determined that the frost information meets the preset defrosting and ice melting condition.

[0015] Further, for each flow path of the evaporating side of the refrigeration unit, the out-temperature difference corresponding to the flow path is calculated, comprising:

[0016] For each flow path of the evaporating side of the refrigeration unit, the inlet temperature and the outlet temperature of the flow path are determined;

[0017] The outlet temperature of the flow path is subtracted from the inlet temperature of the flow path to obtain the out-temperature difference corresponding to the flow path.

[0018] Further, based on the out-temperature difference corresponding to each flow path, the defrosting and ice melting grade corresponding to the flow path is determined, comprising:

[0019] According to the order of the out-temperature difference from small to large, the defrosting and ice melting grade corresponding to each flow path of the evaporating side of the refrigeration unit is generated.

[0020] Further, according to the order of the defrosting and ice melting grade from low to high, the defrosting and ice melting of each flow path of the evaporating side of the refrigeration unit is controlled, comprising:

[0021] According to the order of the defrosting and ice melting grade from low to high, the electromagnetic valves corresponding to each flow path of the evaporating side of the refrigeration unit are opened in sequence to defrost and melt ice of each flow path of the evaporating side of the refrigeration unit;

[0022] Wherein, one flow path corresponds to one electromagnetic valve.

[0023] Further, after the defrosting and ice melting of each flow path of the evaporating side of the refrigeration unit is controlled according to the order of the defrosting and ice melting grade from low to high, the method further comprises:

[0024] Obtaining the low-pressure side pressure value of the refrigeration unit after stopping defrosting and ice melting;

[0025] If the low-pressure side pressure value is less than or equal to a preset pressure threshold value, the electromagnetic valves corresponding to each flow path of the evaporating side of the refrigeration unit are controlled to be closed in sequence until the low-pressure side pressure value is greater than the preset pressure threshold value.

[0026] In a second aspect, the application provides a control device of a refrigeration unit, comprising:

[0027] An information acquisition unit is configured to acquire the frost information of the refrigeration unit;

[0028] An outlet temperature difference calculation unit is configured to calculate, for each flow path of the evaporating side of the refrigeration unit, an outlet temperature difference corresponding to the flow path, if the frosting information satisfies the preset defrosting and ice melting condition.

[0029] A grade determination unit is configured to determine, based on the outlet temperature difference corresponding to each flow path, a defrosting and ice melting grade corresponding to the flow path; wherein the smaller the outlet temperature difference of a flow path is, the lower the defrosting and ice melting grade corresponding to the flow path is.

[0030] A control unit is configured to control, in order from low to high, defrosting and ice melting of each flow path of the evaporating side of the refrigeration unit according to the defrosting and ice melting grade.

[0031] Further, the frosting information includes a frosting thickness and a frosting area; and

[0032] The apparatus further includes:

[0033] A determination unit is configured to determine that the frosting information satisfies the preset defrosting and ice melting condition, if the frosting thickness is greater than or equal to the preset thickness threshold value and the frosting area is greater than or equal to the preset area threshold value.

[0034] Further, the outlet temperature difference calculation unit is specifically configured to:

[0035] For each flow path of the evaporating side of the refrigeration unit, determine an inlet temperature and an outlet temperature of the flow path;

[0036] Subtract the inlet temperature of the flow path from the outlet temperature of the flow path to obtain the outlet temperature difference corresponding to the flow path.

[0037] Further, the grade determination unit is specifically configured to:

[0038] Generate, in order from small to large, the defrosting and ice melting grade corresponding to each flow path of the evaporating side of the refrigeration unit according to the outlet temperature difference.

[0039] Further, the control unit is specifically configured to:

[0040] Open, in order from low to high, the solenoid valve corresponding to each flow path of the evaporating side of the refrigeration unit according to the defrosting and ice melting grade, to defrost and melt ice of each flow path of the evaporating side of the refrigeration unit;

[0041] Wherein, one flow path corresponds to one solenoid valve.

[0042] Further, after controlling, in order from low to high, defrosting and ice melting of each flow path of the evaporating side of the refrigeration unit according to the defrosting and ice melting grade, the control unit is further configured to:

[0043] Obtain a low-pressure side pressure value of the refrigeration unit after stopping defrosting and ice melting;

[0044] If the low-pressure side pressure value is less than or equal to a preset pressure threshold, the control successively closes the electromagnetic valves corresponding to each flow path of the evaporating side of the refrigeration unit until the low-pressure side pressure value is greater than the preset pressure threshold.

[0045] In a third aspect, the application provides a refrigeration unit, comprising an indoor unit and an outdoor unit; wherein the indoor unit comprises an infrared detector and each flow path of the evaporating side of the refrigeration unit, each flow path corresponding to a corresponding electromagnetic valve and a temperature sensor, and the indoor unit is configured to execute the control method of the refrigeration unit of the first aspect.

[0046] The application has at least the following beneficial effects by adopting the above technical solutions:

[0047] Through the application, the defrosting and ice melting conditions are compared with the frosting and ice formation information of the refrigeration unit, defrosting and ice melting are performed at the appropriate time, the evaporating side of the refrigeration unit is divided into multiple flow paths, and the temperature difference of each flow path is calculated. Since the smaller the temperature difference is, the more serious the frosting and ice formation is, the defrosting and ice melting grade is determined based on the temperature difference, the flow path with more serious frosting and ice formation is preferentially defrosted and melted, and the control accuracy of defrosting and ice melting is improved, the defrosting and ice melting effect is improved, and the operation reliability and use safety of the refrigeration unit are improved.

[0048] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0050] Figure 1 is a flow chart of a control method of a refrigeration unit according to an exemplary embodiment;

[0051] Figure 2 is a structural schematic diagram of a control device of a refrigeration unit according to an exemplary embodiment;

[0052] Figure 3 is a structural schematic diagram of a refrigeration unit according to an exemplary embodiment;

[0053] Figure 4 is a structural schematic diagram of another refrigeration unit according to an exemplary embodiment;

[0054] Figure 5 The figure is a schematic structural diagram of an indoor unit according to an exemplary embodiment. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be described in detail below. Obviously, the embodiments described are only some of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other implementation methods obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0056] See also Figure 1 , Figure 1 FIG. 1 is a flow chart showing a method for controlling a refrigeration unit according to an exemplary embodiment. The method for controlling a refrigeration unit includes the following steps:

[0057] Step S101: Acquire frost information of a refrigeration unit.

[0058] Step S102: If the frost information satisfies the preset defrosting and ice-melting conditions, then for each flow path on the evaporation side of the refrigeration unit, the outlet temperature difference corresponding to the flow path is calculated.

[0059] Step S103: Determine the defrost and ice-melting level corresponding to each flow path based on the outlet temperature difference corresponding to the flow path; wherein, the smaller the outlet temperature difference of the flow path, the lower the defrost and ice-melting level corresponding to the flow path.

[0060] Step S104 : controlling the defrosting and ice-melting of each flow path on the evaporation side of the refrigeration unit in the order of the defrosting and ice-melting levels from low to high.

[0061] In this embodiment, the execution subject may be a refrigeration unit, which may include components such as a condenser, an evaporator, a four-way reversing valve, a liquid reservoir, a steam separator, a sensor, a solenoid valve, an electronic expansion valve, a filter, a filter drier, a stop valve, a high-pressure switch, and a variable-frequency fan.

[0062] The frost information may be information reflecting the frost condition of the refrigeration unit, and may include but is not limited to frost thickness, frost area, frost position, etc., which is not limited in this embodiment.

[0063] The preset defrosting and ice-melting conditions may include at least one of the following: the frost thickness is greater than a threshold, the frost area is greater than a threshold, and the number of frost locations is greater than a threshold.

[0064] The refrigerating unit can be provided with an infrared detector, and the evaporating side of the refrigerating unit can include a plurality of flow paths, each of which can be provided with a temperature sensor and a solenoid valve. The infrared detector can detect frosting information of the evaporating side of the refrigerating unit, the temperature sensor can be used to calculate the outlet temperature difference corresponding to the flow path, and the solenoid valve can be used to adjust the opening and closing of the flow path, thereby realizing defrosting and ice melting.

[0065] Specifically, the execution subject can obtain the frosting information of the evaporating side of the refrigerating unit through the infrared detector, and then determine whether the frosting information meets the preset defrosting and ice melting condition. If the frosting information meets the preset defrosting and ice melting condition, it means that the refrigerating unit is seriously frosted, and defrosting and ice melting operation can be performed at this time. Specifically, the outlet temperature difference of each flow path of the evaporating side of the refrigerating unit can be calculated. The outlet temperature difference is the difference between the outlet temperature and the inlet temperature of the flow path. Then, according to the outlet temperature difference, the defrosting and ice melting level corresponding to each flow path is determined. The smaller the outlet temperature difference, the lower the defrosting and ice melting level, and the higher the priority of executing defrosting and ice melting. The larger the outlet temperature difference, the higher the defrosting and ice melting level, and the lower the priority of executing defrosting and ice melting. Then, the execution subject can perform defrosting and ice melting on each flow path in order from low to high according to the defrosting and ice melting level. During the process of performing defrosting and ice melting on each flow path, defrosting and ice melting of the next level flow path can be performed after the defrosting and ice melting of the first level flow path is completed.

[0066] And when defrosting and ice melting is performed on each level flow path, the solenoid valve of the level flow path can be controlled to perform defrosting and ice melting until the end of defrosting and ice melting. Then, defrosting and ice melting of the next level flow path (i.e. the flow path with the smallest outlet temperature difference at this time) is entered, that is, the solenoid valve of the next level flow path is opened.

[0067] It can be understood that based on the refrigeration experiment research, it is found that the serious icing and frosting area has less refrigerant heat absorption, resulting in less temperature rise, and further resulting in smaller outlet temperature difference. Therefore, the smaller the outlet temperature difference, the more serious the icing and frosting.

[0068] Through this hierarchical defrosting and ice melting method, the seriously frosted and iced area (small outlet temperature difference area) can be effectively prioritized for defrosting and ice melting, which can effectively prevent the ice in the seriously frosted and iced area from growing larger and falling off to damage the fan and cause safety accidents.

[0069] As an optional implementation, the frosting information includes frosting thickness and frosting area; and

[0070] The method further includes:

[0071] If the frosting thickness is greater than or equal to the preset thickness threshold value, and the frosting area is greater than or equal to the preset area threshold value, it is determined that the frosting information meets the preset defrosting and ice melting condition.

[0072] In the embodiment, the thickness threshold value and the area threshold value can be preset in the execution subject. If the frost thickness of the flow path on the evaporating side of the refrigeration unit is greater than or equal to the thickness threshold value and the frost area is greater than or equal to the area threshold value, it is determined that the frost and ice are relatively serious, it is determined that the frost information meets the preset defrosting and ice melting condition, and the subsequent staged defrosting and ice melting operation is performed.

[0073] Optionally, if the frost thickness is less than the thickness threshold value and the frost area is less than the area threshold value, it is determined that the frost and ice are not very serious, it is determined that the frost information does not meet the preset defrosting and ice melting condition, and the self-feedback information is fed back to the unit control, and the defrosting and ice melting mode is not entered.

[0074] As an optional embodiment, for each flow path on the evaporating side of the refrigeration unit, the out-temperature difference corresponding to the flow path is calculated, including:

[0075] For each flow path on the evaporating side of the refrigeration unit, the inlet temperature and the outlet temperature of the flow path are determined;

[0076] The outlet temperature of the flow path is subtracted from the inlet temperature of the flow path to obtain the out-temperature difference corresponding to the flow path.

[0077] In the embodiment, for each flow path on the evaporating side of the refrigeration unit, the flow path can correspond to two temperature sensors, one temperature sensor is used to detect the inlet temperature of the flow path, and one temperature sensor is used to detect the outlet temperature of the flow path. Then, the outlet temperature of the flow path is subtracted from the inlet temperature of the flow path, and the out-temperature difference corresponding to the flow path can be obtained.

[0078] As an optional embodiment, based on the out-temperature difference corresponding to each flow path, the defrosting and ice melting grade corresponding to the flow path is determined, including:

[0079] According to the order from small to large of the out-temperature difference, the defrosting and ice melting grade corresponding to each flow path on the evaporating side of the refrigeration unit is generated.

[0080] In the embodiment, after the out-temperature difference of each flow path is calculated, the flow paths can be sorted according to the order from small to large of the out-temperature difference to obtain the sorted flow paths. The sorted flow paths are sequentially staged, the flow path ranked first is determined as the first stage, the flow path ranked second is determined as the second stage, and similarly, the defrosting and ice melting grade corresponding to each flow path is obtained.

[0081] The defrosting and ice melting grade is used to reflect the priority of the flow path for defrosting and ice melting. The lower the defrosting and ice melting grade, the higher the priority of the flow path for defrosting and ice melting.

[0082] As an optional embodiment, according to the order from low to high of the defrosting and ice melting grade, the defrosting and ice melting of each flow path on the evaporating side of the refrigeration unit is controlled, including:

[0083] In order from low to high according to the defrosting and ice melting levels, the electromagnetic valves corresponding to each flow path of the evaporating side of the refrigeration unit are opened in sequence to defrost and melt ice of each flow path of the evaporating side of the refrigeration unit.

[0084] In this embodiment, when the step-by-step defrosting and ice melting is performed, the four-way valve is switched to connect the exhaust pipe to the evaporating side of the unit to realize the hot fluorine defrosting action.

[0085] In this embodiment, when the step-by-step defrosting and ice melting is performed, the four-way valve is switched to connect the exhaust pipe to the evaporating side of the unit to realize the hot fluorine defrosting action.

[0086] In this embodiment, when the step-by-step defrosting and ice melting is performed, the four-way valve is switched to connect the exhaust pipe to the evaporating side of the unit to realize the hot fluorine defrosting action.

[0087] As an optional embodiment, after the defrosting and ice melting of each flow path of the evaporating side of the refrigeration unit is controlled in order from low to high according to the defrosting and ice melting levels, the method further comprises:

[0088] obtaining a low-pressure side pressure value of the refrigeration unit after stopping defrosting and ice melting;

[0089] If the low-pressure side pressure value is less than or equal to a preset pressure threshold, the electromagnetic valves corresponding to each flow path of the evaporating side of the refrigeration unit are closed in sequence until the low-pressure side pressure value is greater than the preset pressure threshold.

[0090] In this embodiment, after the defrosting and ice melting is completed, the four-way valve is switched out of the hot fluorine defrosting action, and the unit is operated in refrigeration. At this time, the main body can obtain a low-pressure side pressure value of the refrigeration unit when the refrigeration is operated after stopping defrosting and ice melting, and compare the low-pressure side pressure value with a preset pressure threshold. If the low-pressure side pressure value is less than or equal to the preset pressure threshold, the electromagnetic valves of each flow path are closed in order from small to large according to the outlet temperature difference of each flow path until the low-pressure side pressure value is greater than the pressure threshold. Through this embodiment, the low-pressure side pressure value can be intelligently adjusted and stabilized, and the problem that the unit cannot effectively refrigerate due to the accumulation of ice after defrosting and ice melting is solved.

[0091] By the scheme, the defrosting and ice melting condition is compared with the preset defrosting and ice melting condition, defrosting and ice melting is performed at the appropriate time, the evaporating side of the refrigerating unit is divided into multiple flow paths, the outlet temperature difference of each flow path is calculated respectively, the defrosting and ice melting grade is determined based on the outlet temperature difference, the flow path with more serious frosting and ice formation is preferentially defrosted and melted, and therefore, the control precision of defrosting and ice melting is improved, the defrosting and ice melting effect is improved, and the operation reliability and use safety of the refrigerating unit are improved.

[0092] Please refer to Figure 2 , Figure 2 is a block diagram of a control device of a refrigerating unit according to an example embodiment, which comprises:

[0093] An information obtaining unit 201 is configured to obtain frosting information of the refrigerating unit.

[0094] An outlet temperature difference calculating unit 202 is configured to, if the frosting information meets the preset defrosting and ice melting condition, calculate the outlet temperature difference corresponding to each flow path of the evaporating side of the refrigerating unit.

[0095] A grade determining unit 203 is configured to determine the defrosting and ice melting grade corresponding to each flow path based on the outlet temperature difference corresponding to the flow path, wherein the outlet temperature difference of the flow path is smaller, and the defrosting and ice melting grade corresponding to the flow path is lower.

[0096] A control unit 204 is configured to control the defrosting and ice melting of each flow path of the evaporating side of the refrigerating unit in the order from low to high according to the defrosting and ice melting grade.

[0097] Further, the frosting information comprises frosting thickness and frosting area.

[0098] The device further comprises:

[0099] A judging unit is configured to determine that the frosting information meets the preset defrosting and ice melting condition if the frosting thickness is greater than or equal to the preset thickness threshold value, and the frosting area is greater than or equal to the preset area threshold value.

[0100] Further, the outlet temperature difference calculating unit 202 is specifically configured to:

[0101] For each flow path of the evaporating side of the refrigerating unit, determine the inlet temperature and the outlet temperature of the flow path.

[0102] Subtract the inlet temperature of the flow path from the outlet temperature of the flow path to obtain the outlet temperature difference corresponding to the flow path.

[0103] Further, the grade determining unit 203 is specifically configured to:

[0104] generate, in order of increasing temperature difference, defrosting and ice melting levels corresponding to each flow path of the evaporating side of the refrigeration unit.

[0105] Further, the control unit 204 is specifically configured to:

[0106] open, in order of increasing defrosting and ice melting levels, the solenoid valves corresponding to each flow path of the evaporating side of the refrigeration unit to defrost and melt ice of each flow path of the evaporating side of the refrigeration unit;

[0107] wherein one flow path corresponds to one solenoid valve.

[0108] Further, after controlling defrosting and ice melting of each flow path of the evaporating side of the refrigeration unit in order of increasing defrosting and ice melting levels, the control unit 204 is further configured to:

[0109] acquire a low-pressure side pressure value of the refrigeration unit after stopping defrosting and ice melting;

[0110] if the low-pressure side pressure value is less than or equal to a preset pressure threshold, control the solenoid valves corresponding to each flow path of the evaporating side of the refrigeration unit to be sequentially closed until the low-pressure side pressure value is greater than the preset pressure threshold.

[0111] It should be noted that the detailed description of the control device of the refrigeration unit is referred to the detailed description of the control method of the refrigeration unit, which will not be repeated here.

[0112] Through the scheme, by comparing the frosting information of the refrigeration unit with the preset defrosting and ice melting conditions, defrosting and ice melting is performed at the appropriate time, the evaporating side of the refrigeration unit is divided into multiple flow paths, the temperature difference of each flow path is calculated, and the defrosting and ice melting level is determined based on the temperature difference. Since the smaller the temperature difference is, the more serious the frosting and icing is, the flow path with more serious frosting and icing is preferentially defrosted and melted, thereby improving the control accuracy of defrosting and ice melting, improving the defrosting and ice melting effect, and helping to improve the operation reliability and use safety of the refrigeration unit.

[0113] Please refer to Figure 3 , Figure 3 is a structural schematic diagram of a refrigeration unit according to an example embodiment, which includes an indoor unit and an outdoor unit, Figure 3 the indoor unit in is the device on the right, and the outdoor unit is the device on the left. Please refer to Figure 4 , Figure 4 is another structural schematic diagram of a refrigeration unit according to an example embodiment, as shown in Figure 4 the indoor unit includes an infrared detector, a temperature sensor 301, and a solenoid valve 302.

[0114] Please refer to Figure 5 , Figure 5 is a structural schematic diagram of an indoor unit according to an exemplary embodiment, the indoor unit comprising an infrared detector and each flow path of the evaporating side of the refrigeration unit, each flow path corresponding to a corresponding electromagnetic valve 302 and temperature sensor 301, the indoor unit being used to execute the control method of the refrigeration unit described above. As shown in Figure 5 , the indoor unit has 7 groups of flow paths, each group of flow paths having 2 temperature sensors 301 for detecting inlet temperature and outlet temperature respectively. Each group of flow paths has an electromagnetic valve 302 for adjusting the opening and closing of the flow path, realizing defrosting and ice melting of the corresponding area of each flow path.

[0115] It can be understood that the same or similar parts in the above embodiments can be mutually referred to, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0116] It should be noted that in the description of the present application, the terms "first", "second" and the like are only used for descriptive purposes and should not be construed as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" or "multiple" is at least two.

[0117] It should be understood that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or a middle element can be present at the same time; when an element is referred to as "connected to" another element, it can be directly connected to the other element or a middle element can be present at the same time, in addition, "connected" used herein can include wireless connection; the phrase "and / or" used herein includes any unit and all combinations of the associated listed items.

[0118] Any process or method descriptions in flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for performing specific logic functions or steps in the process, and the various preferred embodiments of the application can include additional or fewer steps performing the described functions or steps, or perform them in a different order, including asynchronously or in reverse order, depending upon the functionality involved, as will be understood by those skilled in the art.

[0119] It should be understood that various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or their combinations, can be used to implement the hardware: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0120] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment methods can be completed by programs instructing related hardware, and the programs can be stored in a computer readable storage medium, and when the programs are executed, one or a combination of the steps of the method embodiments is included.

[0121] In addition, each functional unit in each embodiment of the present application can be integrated into one processing module, or each unit can be physically present alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be realized in the form of hardware or in the form of a software function module. The integrated module, if realized in the form of a software function module and sold or used as an independent product, can also be stored in a computer readable storage medium.

[0122] The above-mentioned storage medium can be a read-only memory, a magnetic disk or an optical disk, etc.

[0123] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0124] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A control method of a refrigeration unit, characterized by, The method comprises: obtaining frosting information of a refrigerating unit; if the frosting information meets preset defrosting and ice melting conditions, calculating, for each flow path on the evaporating side of the refrigerating unit, an outlet temperature difference corresponding to the flow path; based on the outlet temperature difference corresponding to each flow path, determining a defrosting and ice melting grade corresponding to the flow path; wherein the smaller the outlet temperature difference of a flow path, the lower the defrosting and ice melting grade corresponding to the flow path; controlling defrosting and ice melting of each flow path on the evaporating side of the refrigerating unit in order of the defrosting and ice melting grades from low to high; after controlling defrosting and ice melting of each flow path on the evaporating side of the refrigerating unit in order of the defrosting and ice melting grades from low to high, the method further comprises: obtaining a low-pressure side pressure value of the refrigerating unit after stopping defrosting and ice melting; if the low-pressure side pressure value is less than or equal to a preset pressure threshold, controlling electromagnetic valves corresponding to each flow path on the evaporating side of the refrigerating unit to be sequentially closed until the low-pressure side pressure value is greater than the preset pressure threshold.

2. The method of claim 1, wherein, The frosting information comprises frosting thickness and frosting area; and The method further comprises: if the frosting thickness is greater than or equal to the preset thickness threshold and the frosting area is greater than or equal to the preset area threshold, determining that the frosting information meets the preset defrosting and ice melting conditions.

3. The method of claim 1, wherein, For each flow path on the evaporating side of the refrigerating unit, calculating an outlet temperature difference corresponding to the flow path comprises: for each flow path on the evaporating side of the refrigerating unit, determining an inlet temperature and an outlet temperature of the flow path; subtracting the outlet temperature of the flow path from the inlet temperature of the flow path to obtain the outlet temperature difference corresponding to the flow path.

4. The method of claim 1, wherein, Based on the outlet temperature difference corresponding to each flow path, determining a defrosting and ice melting grade corresponding to the flow path comprises: generating defrosting and ice melting grades corresponding to each flow path on the evaporating side of the refrigerating unit in order of outlet temperature difference from small to large.

5. The method of claim 1, wherein, Controlling defrosting and ice melting of each flow path on the evaporating side of the refrigerating unit in order of the defrosting and ice melting grades from low to high comprises: opening electromagnetic valves corresponding to each flow path on the evaporating side of the refrigerating unit in order of the defrosting and ice melting grades from low to high to defrost and melt ice of each flow path on the evaporating side of the refrigerating unit; wherein one flow path corresponds to one electromagnetic valve.

6. A control device for a refrigeration unit, characterized by The device comprises: an information obtaining unit configured to obtain frosting information of a refrigerating unit; an outlet temperature difference calculating unit configured to, if the frosting information meets preset defrosting and ice melting conditions, calculate, for each flow path on the evaporating side of the refrigerating unit, an outlet temperature difference corresponding to the flow path; a grade determining unit configured to, based on the outlet temperature difference corresponding to each flow path, determine a defrosting and ice melting grade corresponding to the flow path; wherein the smaller the outlet temperature difference of a flow path, the lower the defrosting and ice melting grade corresponding to the flow path; a control unit configured to control defrosting and ice melting of each flow path on the evaporating side of the refrigerating unit in order of the defrosting and ice melting grades from low to high; after controlling defrosting and ice melting of each flow path on the evaporating side of the refrigerating unit in order of the defrosting and ice melting grades from low to high, the control unit is further configured to: obtain a low-pressure side pressure value of the refrigerating unit after stopping defrosting and ice melting; if the low-pressure side pressure value is less than or equal to a preset pressure threshold, control electromagnetic valves corresponding to each flow path on the evaporating side of the refrigerating unit to be sequentially closed until the low-pressure side pressure value is greater than the preset pressure threshold. If the low-pressure side pressure value is less than or equal to a preset pressure threshold, the control successively closes electromagnetic valves corresponding to each flow path of the evaporating side of the refrigeration unit until the low-pressure side pressure value is greater than the preset pressure threshold.

7. The apparatus of claim 6, wherein, The frost information includes a frost thickness and a frost area. And The device further includes: A determination unit configured to determine that the frost information satisfies the preset defrosting and deicing condition if the frost thickness is greater than or equal to a preset thickness threshold and the frost area is greater than or equal to a preset area threshold.

8. The apparatus of claim 6, wherein, The outlet temperature difference calculation unit is specifically configured to: For each flow path of the evaporating side of the refrigeration unit, determine an inlet temperature and an outlet temperature of the flow path; Subtract the outlet temperature of the flow path from the inlet temperature of the flow path to obtain an outlet temperature difference corresponding to the flow path.

9. A refrigeration unit characterized by, The device includes an indoor unit and an outdoor unit; the indoor unit includes an infrared detector and each flow path of the evaporating side of the refrigeration unit, each flow path corresponding to a corresponding electromagnetic valve and a temperature sensor, and the indoor unit is configured to perform the control method of the refrigeration unit according to any one of claims 1 to 5.

Images