Refrigerating apparatus and defrosting control method thereof

Abstract

The application provides a refrigeration device and a defrosting control method thereof, and belongs to the technical field of household appliances. The method sets a first pressure sensor on the upper part of an evaporator and a second pressure sensor on the lower part of the evaporator, so that the pressure difference between the upper and lower parts of the evaporator can be monitored through the first pressure sensor and the second pressure sensor. The pressure difference between the upper and lower parts of the evaporator can be used to represent the frosting degree of the evaporator, and the smaller the pressure difference between the upper and lower parts of the evaporator, the smaller the frosting degree of the evaporator. According to the pressure difference between the upper and lower parts of the evaporator and the preset relationship between the pressure difference and the heating temperature, the first target heating temperature of the PTC heating element for heating defrosting can be determined, so that the PTC heating element can be controlled to heat defrosting according to the first target heating temperature. That is, the heating temperature of the PTC heating element for heating defrosting can be dynamically adjusted by monitoring the frosting degree of the evaporator, which can effectively shorten the defrosting time, improve the defrosting efficiency, and also reduce the power consumption.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a refrigeration device and a defrost control method thereof. Background Art

[0002] Refrigeration devices such as refrigerators and freezers are civilian products that keep food or other items at a constant low temperature.

[0003] In the prior art, a refrigerator typically consists of a cabinet housing a freezer and refrigerator compartment for storing food, beverages, or other items that need to be kept cold. The cabinet also houses a refrigeration system, which cools the freezer and refrigerator compartments. The refrigeration system includes a compressor, evaporator, condenser, and throttling element. Due to the unique operating principle of refrigerator refrigeration, the refrigerant evaporates and absorbs heat as it passes through the evaporator, causing varying degrees of frost to form on the evaporator surface. If defrosting is not performed promptly, the frost layer on the evaporator surface will gradually increase in thickness, reducing the cooling capacity and lowering the refrigerator's operating efficiency. Therefore, refrigerators require defrosting.

[0004] However, current refrigerator defrosting methods typically combine temperature and timing. This means that once the defrost cycle time has expired, defrosting occurs. It also terminates when the temperature reaches the exit setting or the defrost time has expired. This results in longer defrosting times and higher power consumption. In some cases, defrosting may not occur, resulting in wasted energy. Summary of the Invention

[0005] The main purpose of the embodiments of the present application is to propose a refrigeration device and a defrost control method thereof, which aims to control the heating temperature of the PTC heating element used for defrosting by monitoring the pressure difference between the upper and lower sides of the evaporator and the relationship between the preset pressure difference and the heating temperature, thereby effectively shortening the defrost time, improving the defrost efficiency, and reducing power consumption.

[0006] To achieve the above-mentioned purpose, the present invention provides a defrost control method for a refrigeration device, wherein the refrigeration device comprises:

[0007] The box body, which serves as the supporting structure of the refrigeration unit, has several compartments inside;

[0008] A refrigeration system is provided in the box, and the refrigeration system includes an evaporator;

[0009] A PTC heating element is provided on the evaporator, and the PTC heating element is energized to generate heat to melt the frost condensed on the evaporator;

[0010] The pressure detection device includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is arranged at the upper part of the evaporator and is used to collect the upper pressure of the evaporator; the second pressure sensor is arranged at the lower part of the evaporator and is used to collect the lower pressure of the evaporator;

[0011] The defrost control method comprises:

[0012] After the defrost mode is started, the pressure difference between the upper and lower sides of the evaporator is calculated based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0013] determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature, and controlling the PTC heating element to heat at the first target heating temperature;

[0014] monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0015] When it is monitored that the differential pressure between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, the PTC heating element is controlled to be turned off.

[0016] The above technical solution has the following advantages or beneficial effects:

[0017] By disposing a first pressure sensor on the upper portion of the evaporator and a second pressure sensor on the lower portion, the pressure differential between the upper and lower sides of the evaporator can be monitored by the first and second pressure sensors. The pressure differential between the upper and lower sides of the evaporator can be used to indicate the degree of frost on the evaporator; the smaller the pressure differential, the less frost there is. Based on the pressure differential between the upper and lower sides of the evaporator and the relationship between the preset pressure differential and the heating temperature, a first target heating temperature for the PTC heater used for defrosting can be determined. The PTC heater can then be controlled to defrost according to the first target heating temperature. This allows the PTC heater to dynamically adjust the defrosting temperature by monitoring the degree of frost on the evaporator, effectively shortening defrost time, improving defrost efficiency, and reducing power consumption. When the pressure differential between the upper and lower sides of the evaporator is detected to be less than or equal to the first preset pressure differential, indicating that the frost on the evaporator has largely melted, the PTC heater is controlled to shut down and cease heating. Residual heat from the PTC heater and the evaporator chamber is then used to completely melt any remaining frost on the evaporator, minimizing the impact of the defrosting hot airflow on the temperature inside the freezer compartment.

[0018] In one embodiment of the present application, after controlling the PTC heating element to heat at the first target heating temperature, the method further includes:

[0019] returning the upper pressure of the evaporator collected by the first pressure sensor and the lower pressure of the evaporator collected by the second pressure sensor every preset time interval, and calculating the pressure difference between the upper and lower sides of the evaporator.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] By setting the monitoring of the pressure difference between the upper and lower sides of the evaporator every preset time interval, the first target heating temperature of the PTC heating element can be adjusted every preset time interval, and the PTC heating element is controlled to heat according to the adjusted first target heating temperature. That is, the heating temperature of the PTC heating element can be adjusted accordingly following the change of the frosting degree of the evaporator, so that the heating temperature of the PTC heating element can change adaptively to the change of the frosting degree of the evaporator, thereby effectively shortening the defrosting time, improving the defrosting efficiency, and reducing the power consumption.

[0022] In an embodiment of the present application, the first target heating temperature of the PTC heating element is determined according to the pressure difference and a preset relationship between the pressure difference and the heating temperature, and the PTC heating element is controlled to heat at the first target heating temperature, which includes:

[0023] When the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first set pressure difference, the PTC heating element is controlled to heat at a first heating temperature;

[0024] monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second set pressure difference;

[0025] When the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference, the PTC heating element is controlled to switch to heat at a second heating temperature, wherein the first set pressure difference is greater than the second set pressure difference, and the first heating temperature is greater than the second heating temperature.

[0026] The above technical solution has the following advantages or beneficial effects:

[0027] When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first set pressure difference, it means that the evaporator is more frosted. At this time, the PTC heating element is controlled to heat and defrost at a higher first heating temperature. Then, the degree of frost on the evaporator will gradually decrease. When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference, it means that the evaporator is less frosted. At this time, the PTC heating element can be controlled to heat and defrost at a lower second heating temperature. That is, when the evaporator is more frosted, a higher heating temperature is used for heating and defrosting, and when the evaporator is less frosted, a lower heating temperature is used for heating and defrosting. This can improve the defrosting efficiency and reduce energy consumption.

[0028] In one embodiment of the present application, the refrigeration device further includes a first temperature sensor, which is disposed on the evaporator and is used to collect the evaporator temperature. After controlling the PTC heating element to heat at the first target heating temperature, the method further includes:

[0029] The evaporator temperature collected by the first temperature sensor is acquired, and the first target heating temperature is corrected according to the evaporator temperature.

[0030] The above technical solution has the following advantages or beneficial effects:

[0031] By setting up a temperature sensor for collecting the evaporator temperature, after controlling the PTC heating element to heat at the first target heating temperature, the first target heating temperature can be corrected based on the real-time acquired evaporator temperature, so as to save energy as much as possible while maximizing the defrosting efficiency.

[0032] In one embodiment of the present application, obtaining the evaporator temperature acquired by the first temperature sensor and correcting the first target heating temperature according to the evaporator temperature includes:

[0033] When it is monitored that the evaporator temperature is greater than or equal to a first preset temperature, controlling to reduce the first target heating temperature;

[0034] When it is monitored that the evaporator temperature is less than or equal to a second preset temperature, the first target heating temperature is controlled to increase.

[0035] The above technical solution has the following advantages or beneficial effects:

[0036] After the PTC heater is controlled to heat at the first target heating temperature, the evaporator temperature will gradually rise. If the monitored evaporator temperature is greater than or equal to the first preset temperature, it indicates that the evaporator is at risk of overheating. In this case, the first target heating temperature needs to be controlled to be reduced. If the monitored evaporator temperature is less than or equal to the second preset temperature, it indicates that the current heating temperature is low and the defrosting efficiency is low. To improve the defrosting efficiency, the first target temperature needs to be controlled to be increased. In this way, energy consumption can be saved as much as possible while maximizing the defrosting efficiency.

[0037] In one embodiment of the present application, after controlling the PTC heating element to be turned off, the method includes:

[0038] monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0039] When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, the defrost mode is controlled to be turned off.

[0040] The above technical solution has the following advantages or beneficial effects:

[0041] After the PTC heater is turned off, the residual heat from the PTC heater and the evaporator chamber can be used to melt the remaining frost on the evaporator. At this point, the frost on the evaporator can be effectively determined to have melted by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator has melted. At this point, the defrost mode can be controlled to be turned off to end the defrost.

[0042] In one embodiment of the present application, the PTC heating element includes a first PTC heater and a second PTC heater, the first PTC heater is arranged on the upper part of the evaporator, and the second PTC heater is arranged on the bottom of the evaporator;

[0043] Correspondingly, after determining the first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature, the method includes:

[0044] Controlling the first PTC heater to start and perform heating at the first target heating temperature;

[0045] monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first set pressure difference;

[0046] When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first set pressure difference, a second target heating temperature of the PTC heating element is determined based on the pressure difference and the relationship between the preset pressure difference and the heating temperature, and the second PTC heater is controlled to start and heat at the second target heating temperature, wherein the first target heating temperature is greater than the second target heating temperature;

[0047] When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, the first PTC heater and the second PTC heater are controlled to be turned off.

[0048] The above technical solution has the following advantages or beneficial effects:

[0049] By installing a first PTC heater on the upper portion of the evaporator and a second PTC heater on the lower portion, the first PTC heater on the upper portion of the evaporator is activated and heated at the first target temperature after determining the first target heating temperature of the PTC heater based on the pressure differential and the preset relationship between the pressure differential and the heating temperature, thereby preferentially melting the frost on the upper portion of the evaporator. The melted water then flows downward along the evaporator due to gravity, and the residual heat contained in the water is transferred to the frost on the lower portion of the evaporator, preemptively melting some of the frost there. During the heating process of the first PTC heater, the degree of frost on the evaporator gradually decreases, that is, the pressure differential between the upper and lower sides of the evaporator gradually decreases. When the pressure differential between the upper and lower sides of the evaporator is monitored to be less than or equal to the first set pressure differential, the degree of frost on the evaporator has decreased, but the degree of frost on the lower part of the evaporator is still relatively large. At this time, a second target heating temperature of the PTC heater can be determined based on the pressure differential and the relationship between the preset pressure differential and the heating temperature. The second PTC heater located at the bottom of the evaporator is controlled to heat at the lower second target heating temperature. At this time, the first and second PTC heaters simultaneously melt the upper and lower parts of the evaporator, thereby improving defrosting efficiency. When the pressure differential between the upper and lower sides of the evaporator is monitored to be less than or equal to the first set pressure differential, the frost on the evaporator is basically melted. At this time, the first and second PTC heaters are controlled to shut down to stop heating. The residual heat in the PTC heater and the evaporator chamber is used to completely melt the remaining frost on the evaporator, thereby reducing the impact of the defrosting hot airflow on the temperature inside the freezer compartment.

[0050] In one embodiment of the present application, the PTC heating element includes a first PTC heater and a second PTC heater, the first PTC heater is arranged on the upper part of the evaporator, and the second PTC heater is arranged on the bottom of the evaporator;

[0051] Correspondingly, after determining the first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature, the method includes:

[0052] Controlling the first PTC heater to start and perform heating at the first target heating temperature;

[0053] monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second set pressure difference;

[0054] When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference, the second target heating temperature of the PTC heating element is determined according to the pressure difference and the relationship between the preset pressure difference and the heating temperature;

[0055] controlling the first PTC heater to be turned off, and controlling the second PTC heater to be turned on and to perform heating at the second target heating temperature;

[0056] When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, the second PTC heater is controlled to be turned off.

[0057] The above technical solution has the following advantages or beneficial effects:

[0058] By installing a first PTC heater on the upper portion of the evaporator and a second PTC heater on the lower portion, the first PTC heater on the upper portion of the evaporator is activated and heated at the first target temperature after determining the first target heating temperature of the PTC heater based on the pressure differential and the preset relationship between the pressure differential and the heating temperature, thereby preferentially melting the frost on the upper portion of the evaporator. The melted water then flows downward along the evaporator due to gravity, and the residual heat contained in the water is transferred to the frost on the lower portion of the evaporator, preemptively melting some of the frost there. During the heating process of the first PTC heater, the degree of frost on the evaporator will gradually decrease, that is, the pressure difference between the upper and lower sides of the evaporator will gradually decrease. When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference, it means that most of the frost on the evaporator has melted, but the degree of frost on the lower part of the evaporator is still large. At this time, the second target heating temperature of the PTC heating element can be determined based on the pressure difference and the relationship between the preset pressure difference and the heating temperature, and the first PTC heater can be controlled to be turned off and the second PTC heating element arranged at the bottom of the evaporator can be controlled to heat at the second target heating temperature. At this time, since the second PTC heater starts heating, it can melt the frost on the lower part of the evaporator while also being able to melt the frost on the upper part of the evaporator to a certain extent. Therefore, controlling the first PTC heater to be turned off can reduce energy consumption. When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it means that the frost on the evaporator has basically melted. At this time, the second PTC heater is controlled to be turned off to stop heating, and the residual heat in the PTC heating element and the evaporator chamber is used to completely melt the remaining frost on the evaporator, which can reduce the impact of the defrosting hot air flow on the temperature in the freezer compartment.

[0059] In one embodiment of the present application, the PTC heating element includes a first PTC heater and a second PTC heater, the first PTC heater is arranged on the upper part of the evaporator, and the second PTC heater is arranged on the bottom of the evaporator;

[0060] Correspondingly, after determining the first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature, the method includes:

[0061] Controlling the first PTC heater to start and perform heating at the first target heating temperature;

[0062] monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a third set pressure difference;

[0063] When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the third set pressure difference, the second target heating temperature of the PTC heating element is determined according to the pressure difference and the relationship between the preset pressure difference and the heating temperature;

[0064] controlling the first PTC heater to switch to heat at the second target heating temperature, and controlling the second PTC heater to start and heat at the second target heating temperature, wherein the first target heating temperature is greater than the second target heating temperature;

[0065] controlling the first PTC heater and the second PTC heater to stop heating when the pressure difference between the upper side and the lower side of the evaporator is less than or equal to the first preset pressure difference.

[0066] The above technical solution has the following advantages or beneficial effects:

[0067] By setting the first PTC heater at the upper part of the evaporator and the second PTC heater at the lower part of the evaporator, the first target heating temperature of the PTC heating element can be determined according to the relationship between the pressure difference and the preset pressure difference and heating temperature, and then the first PTC heater at the upper part of the evaporator is controlled to start and heat at the first target heating temperature to preferentially melt the frost at the upper part of the evaporator. At this time, the water generated by melting flows downward along the evaporator due to gravity, so that the residual heat contained in the water is transferred to the frost at the lower part of the evaporator to melt a part of the frost at the lower part of the evaporator in advance. During the heating process of the first PTC heater, the frost degree on the evaporator gradually decreases, that is, the pressure difference between the upper side and the lower side of the evaporator gradually decreases. When it is monitored that the pressure difference between the upper side and the lower side of the evaporator is less than or equal to the third set pressure difference, it indicates that the frost degree on the evaporator decreases, but the frost degree at the lower part of the evaporator is still large. At this time, the second target heating temperature of the PTC heating element can be determined according to the relationship between the pressure difference and the preset pressure difference and heating temperature, and the first PTC heater is controlled to switch to heat at the smaller second target heating temperature and the second PTC heating element at the bottom of the evaporator is controlled to heat at the smaller second target heating temperature. At this time, since a part of the frost at the upper part of the evaporator has been melted, and the second PTC heater can also melt the frost at the upper part of the evaporator to a certain extent while melting the frost at the lower part of the evaporator, controlling the first PTC heater to switch to heat at the smaller second target heating temperature can improve the defrosting efficiency and reduce the power consumption. When it is monitored that the pressure difference between the upper side and the lower side of the evaporator is less than or equal to the first preset pressure difference, it indicates that the frost on the evaporator is basically melted. At this time, the first PTC heater and the second PTC heater are controlled to stop heating to completely melt the remaining frost on the evaporator by using the residual heat in the PTC heating element and the evaporator chamber, which can reduce the influence of the defrosting hot air flow on the temperature in the freezing compartment.

[0068] To achieve the above-mentioned purpose, the embodiment of the present application provides a refrigeration device, comprising:

[0069] The box body, which serves as the supporting structure of the refrigeration unit, has several compartments inside;

[0070] A refrigeration system is provided in the box, and the refrigeration system includes an evaporator;

[0071] A PTC heating element is provided on the evaporator, and the PTC heating element is energized to generate heat to melt the frost condensed on the evaporator;

[0072] The pressure detection device includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is arranged at the upper part of the evaporator and is used to collect the upper pressure of the evaporator; the second pressure sensor is arranged at the lower part of the evaporator and is used to collect the lower pressure of the evaporator;

[0073] A controller is electrically connected to the PTC heating element and the pressure detection device, and the controller is used to execute the defrost control method described in any embodiment of the present application.

[0074] The above technical solution has the following advantages or beneficial effects:

[0075] Since the controller of the refrigeration device is capable of executing the defrost control method described in any embodiment of the present application, the first target heating temperature of the PTC heating element for heating and defrosting can be determined based on the pressure difference between the upper and lower sides of the evaporator and the relationship between the preset pressure difference and the heating temperature, thereby controlling the PTC heating element to heat and defrost according to the first target heating temperature. The heating temperature of the PTC heating element for heating and defrosting can be dynamically adjusted by monitoring the degree of frost on the evaporator, which can effectively shorten the defrost time, improve the defrost efficiency, and reduce power consumption. When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it means that the frost on the evaporator has basically melted. At this time, the PTC heating element is controlled to turn off to stop heating, and the residual heat in the PTC heating element and the evaporator chamber is used to completely melt the remaining frost on the evaporator, which can reduce the impact of the defrosting hot air flow on the temperature inside the freezer compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 This is a front perspective diagram of a refrigeration device according to an embodiment of the present application.

[0077] Figure 2 for Figure 1 A cross-sectional view of .

[0078] Figure 3 A schematic diagram of an evaporator provided in one embodiment of the present application.

[0079] Figure 4 This is a flow chart of the defrost control method provided in Example 1 of the present application.

[0080] Figure 5 This is a flow chart of the defrost control method provided in Example 2 of the present application.

[0081] Figure 6 This is a flow chart of the defrost control method provided in Example 3 of the present application.

[0082] Figure 7 This is a flow chart of the defrost control method provided in Example 4 of the present application.

[0083] Figure 8 This is a flow chart of the defrost control method provided in Example 5 of the present application.

[0084] Figure 9 This is a flow chart of the defrost control method provided in Example 6 of the present application.

[0085] Figure 10 This is a flow chart of the defrost control method provided in Example 7 of the present application.

[0086] Figure 11 This is a flow chart of the defrost control method provided in Example 8 of the present application.

[0087] Reference numerals:

[0088] Cabinet 1, refrigeration chamber 11, freezer chamber 12, compressor chamber 13, cabinet door 14, compressor 21, evaporator 22, first PTC heater 31, second PTC heater 32, third PTC heater 33, fourth PTC heater 34, first pressure sensor 41, second pressure sensor 42, first temperature sensor 51. DETAILED DESCRIPTION

[0089] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0090] It should be noted that although the device schematics illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the device or the sequence in the flowcharts. The terms "first," "second," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0091] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0092] Refrigerators have become an essential household appliance in people's daily life. Currently, the defrosting of the refrigerator is basically combined with temperature and timing, that is, once the defrosting period setting time is reached, defrosting is performed, and the temperature is raised to the set temperature or the defrosting time is reached to exit, resulting in a long defrosting time and large power consumption. Some states may appear frost-free defrosting conditions, resulting in energy waste.

[0093] Based on this, the embodiment of the present application proposes a defrosting control method of a refrigeration device, which aims to control the heating temperature of the PTC heating element for heating defrosting by monitoring the pressure difference between the upper and lower sides of the evaporator and the relationship between the preset pressure difference and the heating temperature, which can effectively shorten the defrosting time, improve the defrosting efficiency, and also reduce the power consumption.

[0094] The refrigeration device of the embodiment of the present application can be a refrigeration cabinet body such as a refrigerator, a refrigerator, a hall bar cabinet, etc. The technical solutions of the refrigeration device of the embodiment of the present application are described in detail below.

[0095] Figure 1 It is a front side perspective view of the refrigeration device of the embodiment of the present application. Figure 2 It is Figure 1 A sectional view.

[0096] Please refer to Figures 1 to 2 The refrigerator provided by the embodiment of the present application can include a cabinet 1. The cabinet 1 can adopt a hollow structure such as a cuboid. The cabinet 1 forms the outer shell of the refrigerator. It should be noted that the cabinet 1 can also adopt other hollow shell structures.

[0097] Please refer to Figure 2 In some embodiments, the cabinet 1 inside can be provided with a refrigeration chamber 11 and a freezing chamber 12. The refrigeration chamber 11 and the freezing chamber 12 can be set as multiple storage chambers.

[0098] Please refer to Figure 2 In some embodiments, the refrigeration chamber 11 and the freezing chamber 12 can be used as independent storage spaces to meet different refrigeration requirements such as freezing, refrigeration, etc. according to different food types, and store items that need to be refrigerated or frozen. The refrigeration chamber 11 and the freezing chamber 12 can be arranged up and down or left and right.

[0099] Please refer to Figure 2 In some embodiments, the refrigerator can include a tank. The refrigeration chamber 11 and the freezing chamber 12 can be formed in the tank.

[0100] Please refer to Figure 2 In some embodiments, the refrigerator can include a tank door 14. The tank door 14 can be hinged to the front side of the cabinet 1 to open and close the refrigeration chamber 11 and the freezing chamber 12.

[0101] It should be noted that the box door 14 can be provided in multiple numbers. The box door 14 can be provided in one-to-one correspondence with the refrigerating compartment 11 and the freezing compartment 12. One refrigerating compartment 11 can be provided with one or more box doors 14, and one freezing compartment can also be provided with one or more box doors 14.

[0102] Please refer to Figure 2 As shown in some embodiments, the refrigerator can include a refrigeration system. The refrigeration system can be provided inside the cabinet 1. The refrigeration system can be used to provide cold air inside the refrigerator to maintain a low-temperature environment in each refrigerating compartment 11 and freezing compartment 12. The refrigeration system is a system that uses refrigerant circulation to reduce temperature, which can mainly include a compressor, a condenser, a throttling element, an evaporator, and other main components. The refrigeration system circulates the refrigerant to transfer heat from a low-temperature object to a high-temperature object, thereby achieving a refrigeration effect.

[0103] In some embodiments, the refrigeration system can include a compressor 21. The compressor 21 can act as a power source for the refrigeration cycle, sucking in low-temperature and low-pressure refrigerant gas and compressing it into high-temperature and high-pressure gas. The compressor 21 can deliver high-temperature and high-pressure refrigerant to the condenser.

[0104] In some embodiments, the refrigeration system can include a condenser (not shown in the figure). The condenser can be used to receive the refrigerant flowing out of the compressor 21 and can cool and convert the high-temperature and high-pressure refrigerant gas from the compressor 21 into a liquid state. The condenser can transfer heat from the refrigerant to the surrounding air, thereby reducing the temperature of the refrigerant.

[0105] In some embodiments, the refrigeration system can include a throttling device (not shown in the figure). The condenser can deliver the condensed refrigerant to the throttling device. The throttling device can use a capillary tube. The throttling device can be used to throttle and depressurize the refrigerant.

[0106] In some embodiments, the compressor, condenser, throttling device, and evaporator can be connected in sequence to form a refrigeration circuit. The refrigerant can circulate and flow in the refrigeration circuit to achieve refrigeration of the refrigerating compartment 11 and the freezing compartment 12 inside the cabinet 1.

[0107] In some embodiments, referring to Figure 2 , the cabinet 1 can be provided with a compressor chamber 13. The compressor chamber 13 can be provided with a compressor 21. The compressor chamber 13 can be provided at the bottom region of the cabinet 1. The compressor chamber 13 can be located below the rear side of the freezing compartment 12. The compressor, condenser, throttling device, and other components can be provided inside the cabinet 1.

[0108] It should be noted that in other embodiments, the compressor chamber 13 can also be provided at other positions such as the top or side of the cabinet 1.

[0109] In some embodiments, see Figure 3 As shown, Figure 3 A schematic diagram of an evaporator provided in accordance with one embodiment of the present application. A refrigeration system may include an evaporator 22. A throttling device may deliver throttled and depressurized refrigerant to the evaporator 22. The evaporator 22 may be configured to evaporate and boil the refrigerant vapor, thereby absorbing heat from the surrounding medium.

[0110] In some embodiments, the refrigerator may further include a PTC heating element, which generates heat when powered to melt the frost condensed on the evaporator. The PTC heating element may include multiple PTC heaters. Figure 3 Each PTC heater can be positioned at a different location on the evaporator 22. When powered on, each PTC heater generates heat to melt frost accumulated on the evaporator 22. For example, a first PTC heater 31 can be positioned above the evaporator 22, and a second PTC heater 32 can be positioned at the bottom of the evaporator 22. Furthermore, a third PTC heater 33 can be positioned on the left side of the evaporator 22, a fourth PTC heater 34 on the right side of the evaporator 22, and a fifth PTC heater (not shown) in the middle of the evaporator 22. This allows for combined heating and defrosting, ensuring uniform defrosting.

[0111] PTC heaters contain PTC thermistors, which exhibit constant-temperature heating properties. This principle operates by self-heating when power is applied, causing the resistance to enter a transition zone. During constant-temperature heating, the surface temperature of the PTC thermistor remains constant, dependent solely on the PTC thermistor's Curie temperature and the applied voltage, and largely independent of the ambient temperature. PTC heaters utilize this constant-temperature heating property of PTC thermistors for heating applications with low or medium power. These advantages over traditional heating components include constant-temperature heating, no open flames, high heat conversion rates, minimal influence from power supply voltage, and a long lifespan. A key safety feature is their safety. In the event of a blower failure, the PTC heater's power automatically drops sharply due to insufficient heat dissipation. At this point, the heater's surface temperature remains around the Curie temperature (typically around 250°C), resulting in low energy consumption. PTC heaters also offer automatic power regulation, which is not available with conventional heating coils. When the heat dissipation conditions change, the temperature of the PTC heater changes little, that is, it has a basically constant temperature function, while the temperature of the ordinary heating wire changes greatly and has no constant temperature function.

[0112] In some embodiments, the refrigerator may further include a pressure detection device. Figure 3The pressure detection device may include a first pressure sensor 41 and a second pressure sensor 42. The first pressure sensor 41 is located above the evaporator 22 and is used to detect the upper pressure of the evaporator 22. The second pressure sensor 42 is located below the evaporator 22 and is used to detect the lower pressure of the evaporator 22. The pressure data collected by the first and second pressure sensors 41 and 42 can be used to calculate the pressure differential between the upper and lower sides of the evaporator 22. The degree of frost on the evaporator 22 can be measured based on this pressure differential. The greater the pressure differential, the greater the degree of frost on the evaporator 22. The heating temperature of the PTC heater can be further controlled based on the determined degree of frost on the evaporator 22. If the evaporator 22 is judged to be highly frosted, the PTC heater can be controlled to defrost at a higher temperature. If the evaporator 22 is judged to be less frosted, the PTC heater can be controlled to heat at a lower temperature. This ensures defrosting efficiency while reducing energy consumption.

[0113] In some embodiments, the relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heater can be determined in advance through experiments. This relationship can be a corresponding relationship table, a relationship formula used to represent the corresponding relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heater, or a relationship curve used to represent the corresponding relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heater. Different refrigerator models or different refrigerator parameters may have different corresponding relationships between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heater. After determining the relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heater, pressure data from the first pressure sensor 41 and the second pressure sensor 42 can be collected in real time or at preset intervals to obtain the pressure difference between the upper and lower sides of the evaporator in real time or at preset intervals. Based on the obtained pressure difference and the predetermined corresponding relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature, the heating temperature of the PTC heater can be adjusted in real time or at preset intervals, thereby ensuring defrosting efficiency while minimizing power consumption.

[0114] In some embodiments, the refrigerator may further include a temperature detection device, referring to Figure 3 The temperature detection device includes a first temperature sensor 51, which is disposed on the evaporator 22 and is used to collect the evaporator temperature. The evaporator temperature collected by the first temperature sensor 51 can be used to correct the heating temperature of the PTC heater, which is determined by the pressure difference between the upper and lower sides of the evaporator. This can minimize energy consumption while maximizing defrosting efficiency.

[0115] Example 1

[0116] Reference Figure 4 , Figure 4 This is a flow chart of the defrost control method provided in Example 1 of the present application, which is executed by the refrigeration device provided in the embodiment of the present application, including but not limited to steps S410 to S470.

[0117] Step S410, starting the defrost mode;

[0118] Step S420, calculating the pressure difference between the upper and lower sides of the evaporator based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0119] Step S430, determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature, and controlling the PTC heating element to heat at the first target heating temperature;

[0120] Step S440, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0121] Step S450: When it is detected that the differential pressure between the upper and lower sides of the evaporator is less than or equal to a first preset differential pressure, the PTC heating element is controlled to be turned off;

[0122] Step S460, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0123] Step S470: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, the defrost mode is controlled to be turned off.

[0124] In an embodiment of the present application, a determination can be made as to whether defrost conditions are met based on the evaporator temperature, freezer compartment temperature, and other factors. If so, the defrost mode is initiated. After the defrost mode is initiated, the pressure differential between the upper and lower sides of the evaporator is calculated based on the upper pressure of the evaporator detected by the first pressure sensor and the lower pressure of the evaporator detected by the second pressure sensor. A first target heating temperature for the PTC heater can then be determined based on the pressure differential between the upper and lower sides of the evaporator and the relationship between the preset pressure differential between the upper and lower sides of the evaporator and the heating temperature of the PTC heater. The PTC heater can then be controlled to heat at the first target heating temperature to melt frost on the evaporator. This allows the PTC heater to dynamically adjust the defrost heating temperature by monitoring the degree of frost on the evaporator, effectively shortening defrost time, improving defrost efficiency, and reducing power consumption. The pressure differential between the upper and lower sides of the evaporator can be used to indicate the degree of frost on the evaporator. The smaller the pressure differential, the less frost on the evaporator. By monitoring changes in the pressure differential between the upper and lower sides of the evaporator, changes in frost on the evaporator can be determined. By monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it can be effectively determined whether the frost on the evaporator has basically melted. Specifically, when it is monitored that the pressure difference between the upper and lower sides of the evaporator is greater than the first preset pressure difference, it means that the frost on the evaporator has not melted yet. At this time, it is necessary to control the PTC heating element to continue heating at the first target heating temperature. When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it means that the frost on the evaporator has basically melted. At this time, the PTC heating element can be controlled to turn off to stop heating, and the residual heat in the PTC heating element and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, which can reduce the impact of the defrosting hot air flow on the temperature in the freezer compartment. After controlling the PTC heating element to turn off, the residual heat in the PTC heating element and the evaporator chamber can be used to melt the remaining frost on the evaporator. At this time, the frost on the evaporator can be effectively judged whether it has melted completely by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator has melted completely. At this time, the defrost mode can be controlled to be turned off to end defrosting.

[0125] Example 2

[0126] Reference Figure 5 , Figure 5 This is a flow chart of the defrost control method provided in the second embodiment of the present application, which is executed by the refrigeration device provided in the embodiment of the present application, including but not limited to steps S510 to S5100.

[0127] Step S510, starting the defrost mode;

[0128] Step S520, calculating the pressure difference between the upper and lower sides of the evaporator based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0129] Step S530, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first set pressure difference;

[0130] Step S540: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first set pressure difference, the PTC heating element is controlled to heat at the first heating temperature;

[0131] Step S550: If the pressure difference between the upper and lower sides of the evaporator is greater than the first set pressure difference, monitor whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference;

[0132] Step S560: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference, the PTC heating element is controlled to switch to heating at the second heating temperature, wherein the first set pressure difference is greater than the second set pressure difference, and the first heating temperature is greater than the second heating temperature;

[0133] Step S570, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0134] Step S580: When it is detected that the differential pressure between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference, the PTC heating element is controlled to be turned off;

[0135] Step S590, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0136] Step S5100: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference, the defrost mode is controlled to be turned off.

[0137] In an embodiment of the present application, a determination can be made as to whether defrosting conditions are met based on the evaporator temperature, the freezer compartment temperature, and other factors. If so, the defrost mode is activated. After the defrost mode is activated, the pressure differential between the upper and lower sides of the evaporator can be calculated based on the upper pressure of the evaporator detected by the first pressure sensor and the lower pressure of the evaporator detected by the second pressure sensor. Furthermore, a first target heating temperature of the PTC heater can be determined based on the pressure differential between the upper and lower sides of the evaporator and the preset relationship between the pressure differential between the upper and lower sides of the evaporator and the heating temperature of the PTC heater. The PTC heater can then be controlled to heat at the first target heating temperature to melt frost on the evaporator. Specifically, when the pressure differential between the upper and lower sides of the evaporator is detected to be less than or equal to a first set pressure differential, the PTC heater is controlled to heat at the first heating temperature. If the pressure differential between the upper and lower sides of the evaporator is greater than the first set pressure differential, the pressure differential between the upper and lower sides of the evaporator is monitored to be less than or equal to a second set pressure differential. If the pressure differential between the upper and lower sides of the evaporator is detected to be less than or equal to the second set pressure differential, the PTC heater is controlled to switch to heating at the second heating temperature. That is, by monitoring the changes in the degree of frost on the evaporator, the heating temperature of the PTC heating element used for heating and defrosting can be dynamically adjusted, which can effectively shorten the defrost time, improve the defrost efficiency, and reduce power consumption. The pressure difference between the upper and lower sides of the evaporator can be used to characterize the degree of frost on the evaporator. The smaller the pressure difference between the upper and lower sides of the evaporator, the smaller the degree of frost on the evaporator. By monitoring the changes in the pressure difference between the upper and lower sides of the evaporator, the changes in the frost on the evaporator can be judged. By monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it can be effectively judged whether the frost on the evaporator is basically melted. Specifically, when it is detected that the pressure difference between the upper and lower sides of the evaporator is greater than the first preset pressure difference, it means that the frost on the evaporator has not melted. At this time, it is necessary to control the PTC heating element to continue heating at the first target heating temperature. When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it means that the frost on the evaporator has basically melted. At this time, the PTC heating element can be controlled to turn off to stop heating, and the residual heat in the PTC heating element and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, which can reduce the impact of the defrosting hot air flow on the temperature in the freezer compartment. After the PTC heating element is controlled to turn off, the residual heat in the PTC heating element and the evaporator chamber can be used to melt the remaining frost on the evaporator. At this time, by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be effectively determined whether the frost on the evaporator has been completely melted. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator has been completely melted. At this time, the defrost mode can be controlled to be turned off to end the defrost.

[0138] Example 3

[0139] Reference Figure 6 , Figure 6This is a flow chart of the defrost control method provided in the third embodiment of the present application, which is executed by the refrigeration device provided in the embodiment of the present application, including but not limited to steps S610 to S690.

[0140] Step S610, starting the defrost mode;

[0141] Step S620, calculating the pressure difference between the upper and lower sides of the evaporator based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0142] Step S630, determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature, and controlling the PTC heating element to heat at the first target heating temperature;

[0143] Step S640: Determine whether the interval duration is greater than or equal to a preset time:

[0144] Step S650: If the interval time is greater than or equal to the preset time, return to step S620; if the interval time is less than the preset time, control the PTC heating element to continue heating at the first target heating temperature;

[0145] Step S660, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0146] Step S670: When it is detected that the differential pressure between the upper and lower sides of the evaporator is less than or equal to a first preset differential pressure, the PTC heating element is controlled to be turned off;

[0147] Step S680, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0148] Step S690: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, the defrost mode is controlled to be turned off.

[0149] In an embodiment of the present application, it is first possible to determine whether the defrosting conditions are met based on the evaporator temperature, the freezer compartment temperature, etc. If so, the defrost mode is started. After the defrost mode is started, the pressure difference between the upper and lower sides of the evaporator can be calculated based on the upper pressure of the evaporator collected by the first pressure sensor and the lower pressure of the evaporator collected by the second pressure sensor. Thus, the first target heating temperature of the PTC heater can be further determined based on the pressure difference between the upper and lower sides of the evaporator and the preset relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heater, so that the PTC heater can be controlled to heat at the first target heating temperature to melt the frost on the evaporator. That is, by monitoring the degree of frost on the evaporator, the heating temperature of the PTC heater used for heating and defrosting can be dynamically adjusted, which can effectively shorten the defrost time, improve the defrost efficiency, and reduce power consumption. After the PTC heater is controlled to heat at the first target heating temperature, the degree of frost on the evaporator will change, that is, the pressure difference between the upper and lower sides of the evaporator will change. At this point, the time interval between the last acquisition of pressure data collected by the first pressure sensor 41 and the second pressure sensor 42 can be determined, and whether the time interval is greater than or equal to a preset time. If the time interval is greater than or equal to the preset time, the process returns to the step of calculating the pressure differential between the upper and lower sides of the evaporator based on the upper pressure of the evaporator collected by the first pressure sensor and the lower pressure of the evaporator collected by the second pressure sensor, thereby updating the pressure differential between the upper and lower sides of the evaporator. Based on the updated pressure differential between the upper and lower sides of the evaporator and the corresponding relationship between the pressure differential between the upper and lower sides of the evaporator and the heating temperature of the PTC heater, the first target heating temperature of the PTC heater can be updated to control the PTC heater to heat at the updated first target heating temperature. If the time interval is less than the preset time, the PTC heater is controlled to continue heating at the first target heating temperature. The pressure differential between the upper and lower sides of the evaporator can be used to indicate the degree of frost on the evaporator. The smaller the pressure differential, the less frost on the evaporator. By monitoring changes in the pressure differential between the upper and lower sides of the evaporator, changes in frost on the evaporator can be determined. By monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it can be effectively determined whether the frost on the evaporator has basically melted. Specifically, when it is monitored that the pressure difference between the upper and lower sides of the evaporator is greater than the first preset pressure difference, it means that the frost on the evaporator has not melted yet. At this time, it is necessary to control the PTC heating element to continue heating at the first target heating temperature. When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it means that the frost on the evaporator has basically melted. At this time, the PTC heating element can be controlled to turn off to stop heating, and the residual heat in the PTC heating element and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, which can reduce the impact of the defrosting hot air flow on the temperature in the freezer compartment. After controlling the PTC heating element to turn off, the residual heat in the PTC heating element and the evaporator chamber can be used to melt the remaining frost on the evaporator.At this time, the frost on the evaporator can be effectively judged whether it has melted completely by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator has melted completely. At this time, the defrost mode can be controlled to be turned off to end defrosting.

[0150] Example 4

[0151] Reference Figure 7 , Figure 7 This is a flow chart of the defrost control method provided in the fourth embodiment of the present application, which is executed by the refrigeration device provided in the embodiment of the present application, including but not limited to steps S710 to S790.

[0152] Step S710, starting the defrost mode;

[0153] Step S720, calculating the pressure difference between the upper and lower sides of the evaporator based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0154] Step S730, determining a first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature, and controlling the PTC heating element to heat at the first target heating temperature;

[0155] Step S740, obtaining the evaporator temperature collected by the first temperature sensor;

[0156] Step S750, correcting the first target heating temperature according to the evaporator temperature, and controlling the PTC heating element to heat at the corrected first target heating temperature;

[0157] Step S760, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0158] Step S770: When it is detected that the differential pressure between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference, the PTC heating element is controlled to be turned off;

[0159] Step S780, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0160] Step S790: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, the defrost mode is controlled to be turned off.

[0161] In an embodiment of the present application, a determination can be made as to whether defrost conditions are met based on the evaporator temperature, freezer compartment temperature, and other factors. If so, a defrost mode is initiated. After the defrost mode is initiated, a pressure differential between the upper and lower sides of the evaporator is calculated based on the upper pressure of the evaporator detected by the first pressure sensor and the lower pressure of the evaporator detected by the second pressure sensor. A first target heating temperature of the PTC heater can then be determined based on the pressure differential between the upper and lower sides of the evaporator and the relationship between the preset pressure differential between the upper and lower sides of the evaporator and the heating temperature of the PTC heater. The PTC heater can then be controlled to heat at the first target heating temperature to melt frost on the evaporator. This means that the defrost heating temperature of the PTC heater can be dynamically adjusted by monitoring the degree of frost on the evaporator, effectively shortening defrost time, improving defrost efficiency, and reducing power consumption. After the PTC heater is controlled to heat at the first target heating temperature, the evaporator temperature detected by the first temperature sensor located on the evaporator can be obtained. The first target heating temperature can then be corrected based on the obtained evaporator temperature, so that the PTC heater is controlled to heat at the corrected first target heating temperature. The pressure differential between the upper and lower sides of the evaporator can be used to indicate the degree of frost on the evaporator. The smaller the pressure differential, the less frost on the evaporator. By monitoring changes in the pressure differential, changes in the frost on the evaporator can be determined. By monitoring whether the pressure differential is less than or equal to a first preset pressure differential, it can be effectively determined whether the frost on the evaporator has substantially melted. Specifically, when the pressure differential is greater than the first preset pressure differential, indicating that the frost on the evaporator has not yet melted, the PTC heater should be controlled to continue heating at the first target heating temperature. When the pressure differential is less than or equal to the first preset pressure differential, indicating that the frost on the evaporator has substantially melted, the PTC heater can be controlled to shut down and stop heating. The residual heat from the PTC heater and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, thereby reducing the impact of the defrosting hot airflow on the temperature inside the freezer compartment. After the PTC heater is shut down, the residual heat from the PTC heater and the evaporator chamber can be used to melt the remaining frost on the evaporator. At this time, the frost on the evaporator can be effectively judged whether it has melted completely by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator has melted completely. At this time, the defrost mode can be controlled to be turned off to end defrosting.

[0162] Example 5

[0163] Reference Figure 8 , Figure 8This is a flow chart of the defrost control method provided in Example 5 of the present application, which is executed by the refrigeration device provided in the embodiment of the present application, including but not limited to steps S810 to S8120.

[0164] Step S810, starting the defrost mode;

[0165] Step S820, calculating the pressure difference between the upper and lower sides of the evaporator based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0166] Step S830, determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature, and controlling the PTC heating element to heat at the first target heating temperature;

[0167] Step S840, obtaining the evaporator temperature collected by the first temperature sensor;

[0168] Step S850, monitoring whether the evaporator temperature is greater than or equal to a first preset temperature;

[0169] Step S860: When the evaporator temperature is detected to be greater than or equal to the first preset temperature, the first target heating temperature is controlled to be reduced;

[0170] Step S870: If the evaporator temperature is lower than the first preset temperature, monitor whether the evaporator temperature is lower than or equal to the second preset temperature;

[0171] Step S880: When the evaporator temperature is detected to be less than or equal to the second preset temperature, the first target heating temperature is increased;

[0172] Step S890, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0173] Step S8100: When it is detected that the differential pressure between the upper and lower sides of the evaporator is less than or equal to a first preset differential pressure, the PTC heating element is controlled to be turned off;

[0174] Step S8110, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0175] Step S8120: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, the defrost mode is controlled to be turned off.

[0176] In an embodiment of the present application, a determination can be made as to whether defrost conditions are met based on the evaporator temperature, freezer compartment temperature, and other factors. If so, a defrost mode is initiated. After the defrost mode is initiated, a pressure differential between the upper and lower sides of the evaporator is calculated based on the upper pressure of the evaporator detected by the first pressure sensor and the lower pressure of the evaporator detected by the second pressure sensor. A first target heating temperature of the PTC heater can then be determined based on the pressure differential between the upper and lower sides of the evaporator and the relationship between the preset pressure differential between the upper and lower sides of the evaporator and the heating temperature of the PTC heater. The PTC heater can then be controlled to heat at the first target heating temperature to melt frost on the evaporator. This means that the defrost heating temperature of the PTC heater can be dynamically adjusted by monitoring the degree of frost on the evaporator, effectively shortening defrost time, improving defrost efficiency, and reducing power consumption. After the PTC heater is controlled to heat at the first target heating temperature, the evaporator temperature detected by the first temperature sensor located on the evaporator can be obtained. The first target heating temperature can then be corrected based on the obtained evaporator temperature, so that the PTC heater is controlled to heat at the corrected first target heating temperature. Specifically, if the evaporator temperature is monitored to be greater than or equal to the first preset temperature, it means that the evaporator is at risk of overheating. At this time, it is necessary to control the first target heating temperature to be reduced; if the evaporator temperature is monitored to be less than or equal to the second preset temperature, it means that the current heating temperature is low and the defrosting efficiency is low. In order to improve the defrosting efficiency, it is necessary to control the first target temperature to be increased. In this way, energy consumption can be saved as much as possible while maximizing the defrosting efficiency. The pressure difference between the upper and lower sides of the evaporator can be used to characterize the degree of frost on the evaporator. The smaller the pressure difference between the upper and lower sides of the evaporator, the smaller the degree of frost on the evaporator. By monitoring the changes in the pressure difference between the upper and lower sides of the evaporator, the changes in the frost on the evaporator can be judged. By monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it can be effectively judged whether the frost on the evaporator has basically melted. Specifically, when the pressure difference between the upper and lower sides of the evaporator is monitored to be greater than the first preset pressure difference, it means that the frost on the evaporator has not melted. At this time, it is necessary to control the PTC heating element to continue heating at the first target heating temperature. When the pressure differential between the upper and lower sides of the evaporator is monitored to be less than or equal to a first preset pressure differential, indicating that the frost on the evaporator has essentially melted, the PTC heater can be controlled to shut down to stop heating. The residual heat from the PTC heater and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, thereby reducing the impact of the defrosting hot airflow on the temperature inside the freezer compartment. After the PTC heater is controlled to shut down, the residual heat from the PTC heater and the evaporator chamber can be used to melt the remaining frost on the evaporator.At this time, the frost on the evaporator can be effectively judged whether it has melted completely by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator has melted completely. At this time, the defrost mode can be controlled to be turned off to end defrosting.

[0177] Example 6

[0178] Reference Figure 9 , Figure 9 This is a flow chart of the defrost control method provided in Example 6 of the present application, which is executed by the refrigeration device provided in the embodiment of the present application, including but not limited to steps S910 to S9100.

[0179] Step S910, starting the defrost mode;

[0180] Step S920, calculating the pressure difference between the upper and lower sides of the evaporator based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0181] Step S930, determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature;

[0182] Step S940, controlling the first PTC heater to start and heat at a first target heating temperature;

[0183] Step S950, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first set pressure difference;

[0184] Step S960: When the pressure difference between the upper and lower sides of the evaporator is monitored to be less than or equal to a first set pressure difference, a second target heating temperature of the PTC heating element is determined based on the pressure difference and the relationship between the preset pressure difference and the heating temperature, and the second PTC heater is controlled to start and heat at the second target heating temperature, wherein the first target heating temperature is greater than the second target heating temperature.

[0185] Step S970, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0186] Step S980: When it is detected that the differential pressure between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference, the first PTC heater and the second PTC heater are controlled to be turned off;

[0187] Step S990, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0188] Step S9100: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference, the defrost mode is controlled to be turned off.

[0189] In the embodiment of the present application, it is first possible to determine whether the defrost conditions are met based on the evaporator temperature, the freezer compartment temperature, etc. If so, the defrost mode is activated. After the defrost mode is activated, the pressure difference between the upper and lower sides of the evaporator can be calculated based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor. Thus, the first target heating temperature of the first PTC heater provided on the upper part of the evaporator can be further determined based on the pressure difference between the upper and lower sides of the evaporator and the preset relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heating element, so that the first PTC heater can be controlled to heat at the first target heating temperature to melt the frost on the upper part of the evaporator. At this time, the melted water flows down the evaporator due to gravity, so that the residual heat contained in the water will be transferred to the frost on the lower part of the evaporator to melt part of the frost on the lower part of the evaporator in advance. During the heating process of the first PTC heater, the degree of frost on the evaporator gradually decreases, that is, the pressure differential between the upper and lower sides of the evaporator gradually decreases. When the pressure differential between the upper and lower sides of the evaporator is monitored to be less than or equal to the first set pressure differential, it indicates that the degree of frost on the evaporator has decreased, but the degree of frost on the lower part of the evaporator is still relatively large. In this case, the second target heating temperature of the PTC heater can be determined based on the pressure differential between the upper and lower sides of the evaporator and the relationship between the preset pressure differential and the heating temperature. The second PTC heater located at the bottom of the evaporator is then activated and heated at the second target heating temperature to melt the frost on the lower part of the evaporator. In this case, the first and second PTC heaters simultaneously melt the frost above and below the evaporator, improving defrosting efficiency. The pressure differential between the upper and lower sides of the evaporator can be used to indicate the degree of frost on the evaporator. The smaller the pressure differential, the less frost on the evaporator. By monitoring the changes in the pressure differential between the upper and lower sides of the evaporator, changes in the frost on the evaporator can be determined. By monitoring whether the pressure differential between the upper and lower sides of the evaporator is less than or equal to the first set pressure differential, it is effectively determined whether the frost on the evaporator has been substantially melted. Specifically, when the pressure differential between the upper and lower sides of the evaporator is detected to be greater than a first preset pressure differential, indicating that the frost on the evaporator has not yet melted, the first and second PTC heaters need to be controlled to continue heating. When the pressure differential between the upper and lower sides of the evaporator is detected to be less than or equal to the first preset pressure differential, indicating that the frost on the evaporator has essentially melted, the first and second PTC heaters can be controlled to shut down to stop heating. The residual heat within the PTC heating element and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, thereby reducing the impact of the defrosting hot airflow on the temperature inside the freezer compartment. After the first and second PTC heaters are shut down, the residual heat within the PTC heating element and the evaporator chamber can be used to melt the remaining frost on the evaporator.At this time, the frost on the evaporator can be effectively judged whether it has melted completely by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator has melted completely. At this time, the defrost mode can be controlled to be turned off to end defrosting.

[0190] Example 7

[0191] Reference Figure 10 , Figure 10 This is a flow chart of the defrost control method provided in Example 7 of the present application, which is executed by the refrigeration device provided in the embodiment of the present application, including but not limited to steps S1010 to S10110.

[0192] Step S1010, starting the defrost mode;

[0193] Step S1020, calculating the pressure difference between the upper and lower sides of the evaporator based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor;

[0194] Step S1030, determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature;

[0195] Step S1040, controlling the first PTC heater to start and heat at a first target heating temperature;

[0196] Step S1050, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second set pressure difference;

[0197] Step S1060: When the pressure difference between the upper and lower sides of the evaporator is monitored to be less than or equal to the second set pressure difference, a second target heating temperature of the PTC heating element is determined based on the pressure difference and the relationship between the preset pressure difference and the heating temperature;

[0198] Step S1070, controlling the first PTC heater to be turned off, and controlling the second PTC heater to be turned on and to perform heating at a second target heating temperature;

[0199] Step S1080, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference;

[0200] Step S1090: When it is detected that the differential pressure between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference, the second PTC heater is controlled to be turned off;

[0201] Step S10100, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference;

[0202] Step S10110: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference, the defrost mode is controlled to be turned off.

[0203] In the embodiment of the present application, it is first possible to determine whether the defrost conditions are met based on the evaporator temperature, the freezer compartment temperature, etc. If so, the defrost mode is activated. After the defrost mode is activated, the pressure difference between the upper and lower sides of the evaporator can be calculated based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor. Thus, the first target heating temperature of the first PTC heater provided on the upper part of the evaporator can be further determined based on the pressure difference between the upper and lower sides of the evaporator and the preset relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heating element, so that the first PTC heater can be controlled to heat at the first target heating temperature to melt the frost on the upper part of the evaporator. At this time, the melted water flows down the evaporator due to gravity, so that the residual heat contained in the water will be transferred to the frost on the lower part of the evaporator to melt part of the frost on the lower part of the evaporator in advance. During the heating process of the first PTC heater, the degree of frost on the evaporator gradually decreases, that is, the pressure differential between the upper and lower sides of the evaporator gradually decreases. When the pressure differential between the upper and lower sides of the evaporator is monitored to be less than or equal to the second set pressure differential, it indicates that most of the frost on the evaporator has melted, but the frost on the lower portion of the evaporator is still relatively large. In this case, the second target heating temperature of the PTC heater can be determined based on the pressure differential between the upper and lower sides of the evaporator and the relationship between the preset pressure differential and the heating temperature. This allows the first PTC heater to be turned off and the second PTC heater located at the bottom of the evaporator to be activated and heated at the second target heating temperature to melt the frost on the lower portion of the evaporator. At this time, since the second PTC heater is activated, it can melt the frost on the lower portion of the evaporator while also melting some of the frost on the upper portion of the evaporator. Therefore, turning off the first PTC heater can reduce power consumption. The pressure differential between the upper and lower sides of the evaporator can be used to indicate the degree of frost on the evaporator. The smaller the pressure differential, the less frost there is. By monitoring the changes in the pressure differential between the upper and lower sides of the evaporator, changes in the frost on the evaporator can be determined. By monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it is possible to effectively determine whether the frost on the evaporator has basically melted. Specifically, when it is detected that the pressure difference between the upper and lower sides of the evaporator is greater than the first preset pressure difference, it means that the frost on the evaporator has not melted. At this time, it is necessary to control the second PTC heater to continue heating. When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it means that the frost on the evaporator has basically melted. At this time, the second PTC heater can be controlled to turn off to stop heating, and the residual heat in the PTC heating element and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, which can reduce the impact of the defrosting hot air flow on the temperature in the freezer compartment. After the first and second PTC heaters are controlled to turn off, the residual heat in the PTC heating element and the evaporator chamber can be used to melt the remaining frost on the evaporator.At this time, whether the frost on the evaporator is melted can be effectively determined by monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference. Specifically, when the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, it can be determined that the frost on the evaporator is melted. At this time, the defrosting mode can be controlled to be closed to end the defrosting.

[0204] Embodiment Eight

[0205] Reference Figure 11 , Figure 11 is a flowchart of the defrosting control method provided by Embodiment Eight of the present application. The refrigeration device provided by the embodiments of the present application performs, including but not limited to steps S1110 to S11100.

[0206] Step S1110, starting the defrosting mode;

[0207] Step S1120, calculating the pressure difference between the upper and lower sides of the evaporator according to the upper pressure of the evaporator collected by the first pressure sensor and the lower pressure of the evaporator collected by the second pressure sensor;

[0208] Step S1130, determining the first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature;

[0209] Step S1140, controlling the first PTC heater to start and heat at the first target heating temperature;

[0210] Step S1150, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the third set pressure difference;

[0211] Step S1160, when it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the third set pressure difference, determining the second target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature;

[0212] Step S1170, controlling the first PTC heater to switch to heat at the second target heating temperature, and controlling the second PTC heater to start and heat at the second target heating temperature, wherein the first target heating temperature is greater than the second target heating temperature;

[0213] Step S1180, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference;

[0214] Step S1190, when it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, controlling the first PTC heater and the second PTC heater to be closed;

[0215] Step S11100, monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference;

[0216] Step S11110: When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference, the defrost mode is controlled to be turned off.

[0217] In the embodiment of the present application, it is first possible to determine whether the defrost conditions are met based on the evaporator temperature, the freezer compartment temperature, etc. If so, the defrost mode is activated. After the defrost mode is activated, the pressure difference between the upper and lower sides of the evaporator can be calculated based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor. Thus, the first target heating temperature of the first PTC heater provided on the upper part of the evaporator can be further determined based on the pressure difference between the upper and lower sides of the evaporator and the preset relationship between the pressure difference between the upper and lower sides of the evaporator and the heating temperature of the PTC heating element, so that the first PTC heater can be controlled to heat at the first target heating temperature to melt the frost on the upper part of the evaporator. At this time, the melted water flows down the evaporator due to gravity, so that the residual heat contained in the water will be transferred to the frost on the lower part of the evaporator to melt part of the frost on the lower part of the evaporator in advance. During the heating process of the first PTC heater, the degree of frost on the evaporator will gradually decrease, that is, the pressure difference between the upper and lower sides of the evaporator will gradually decrease. When the pressure difference between the upper and lower sides of the evaporator is monitored to be less than or equal to the third set pressure difference, it means that the degree of frost on the evaporator has decreased, but the degree of frost on the lower part of the evaporator is still large. At this time, the second target heating temperature of the PTC heater can be determined based on the pressure difference between the upper and lower sides of the evaporator and the relationship between the preset pressure difference and the heating temperature, so that the first PTC heater can be controlled to switch to heating at the second target heating temperature, and the second PTC heater can be controlled to start and heat at the second target heating temperature, wherein the first target heating temperature is greater than the second target heating temperature. At this time, since the frost on the upper part of the evaporator has partially melted, and the second PTC heater can melt the frost on the upper part of the evaporator to a certain extent while melting the frost on the lower part of the evaporator, controlling the first PTC heater to switch to heating at the smaller second target heating temperature can improve defrosting efficiency while reducing power consumption. The pressure difference between the upper and lower sides of the evaporator can be used to characterize the degree of frost on the evaporator. The smaller the pressure difference between the upper and lower sides of the evaporator, the smaller the degree of frost on the evaporator. By monitoring the changes in the pressure difference between the upper and lower sides of the evaporator, the changes in the frost on the evaporator can be determined. By monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it can be effectively determined whether the frost on the evaporator has basically melted. Specifically, when it is detected that the pressure difference between the upper and lower sides of the evaporator is greater than the first preset pressure difference, it means that the frost on the evaporator has not melted. At this time, it is necessary to control the second PTC heater to continue heating. When it is detected that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, it means that the frost on the evaporator has basically melted. At this time, the second PTC heater can be controlled to turn off to stop heating, and the residual heat in the PTC heating element and the evaporator chamber can be used to completely melt the remaining frost on the evaporator, which can reduce the impact of the defrosting hot air flow on the temperature in the freezer compartment.After the first and second PTC heaters are turned off, the PTC heaters and the residual heat within the evaporator chamber can be used to melt the remaining frost on the evaporator. At this point, the frost on the evaporator can be effectively determined to have melted by monitoring whether the pressure differential between the upper and lower sides of the evaporator is less than or equal to a second preset pressure differential. Specifically, when the pressure differential between the upper and lower sides of the evaporator is less than or equal to the second preset pressure differential, it can be determined that the frost on the evaporator has melted. At this point, the defrost mode can be controlled to be turned off to end the defrost.

[0218] The present application also provides a refrigeration device, including:

[0219] The box body, which serves as the supporting structure of the refrigeration unit, has several compartments inside;

[0220] A refrigeration system is provided in the box, and the refrigeration system includes an evaporator;

[0221] The PTC heating element is installed in the evaporator. When the PTC heating element is powered on, it generates heat to melt the frost condensed on the evaporator.

[0222] The pressure detection device includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is arranged at the upper part of the evaporator and is used to collect the upper pressure of the evaporator; the second pressure sensor is arranged at the lower part of the evaporator and is used to collect the lower pressure of the evaporator;

[0223] The controller is electrically connected to the PTC heating element and the pressure detection device, and is used to execute the defrost control method of any embodiment of the present application.

[0224] An embodiment of the present application provides a refrigeration device. Since the controller of the refrigeration device can execute the defrost control method described in any embodiment of the present application, that is, by monitoring the pressure difference between the upper and lower sides of the evaporator and the relationship between the preset pressure difference and the heating temperature, the heating temperature of the PTC heating element used for heating and defrosting is controlled, which can effectively shorten the defrost time, improve the defrost efficiency, and reduce energy consumption.

[0225] The embodiments described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0226] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0227] Those skilled in the art will appreciate that all or some of the steps in the methods, systems, and functional modules / units in the devices disclosed above may be implemented as software, firmware, hardware, or appropriate combinations thereof.

[0228] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0229] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0230] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A defrost control method for a refrigeration device, characterized in that: The refrigeration device comprises: The box body, which serves as the supporting structure of the refrigeration unit, has several compartments inside; A refrigeration system is provided in the box, and the refrigeration system includes an evaporator; A PTC heating element is provided on the evaporator, and the PTC heating element is energized to generate heat to melt the frost condensed on the evaporator; The pressure detection device includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is arranged at the upper part of the evaporator and is used to collect the upper pressure of the evaporator; the second pressure sensor is arranged at the lower part of the evaporator and is used to collect the lower pressure of the evaporator; The defrost control method comprises: After the defrost mode is started, the pressure difference between the upper and lower sides of the evaporator is calculated based on the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor; determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature, and controlling the PTC heating element to heat at the first target heating temperature; monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first preset pressure difference; When it is monitored that the differential pressure between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, the PTC heating element is controlled to be turned off.

2. The method according to claim 1, characterized in that After controlling the PTC heating element to perform heating at the first target heating temperature, the method further includes: The step of returning the upper pressure of the evaporator acquired by the first pressure sensor and the lower pressure of the evaporator acquired by the second pressure sensor at preset time intervals to calculate the pressure difference between the upper and lower sides of the evaporator.

3. The method according to claim 1, characterized in that The determining a first target heating temperature of the PTC heating element according to the pressure difference and a preset relationship between the pressure difference and the heating temperature, and controlling the PTC heating element to heat at the first target heating temperature includes: When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first set pressure difference, the PTC heating element is controlled to heat at a first heating temperature; monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second set pressure difference; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference, the PTC heating element is controlled to switch to heating at the second heating temperature, wherein the first set pressure difference is greater than the second set pressure difference, and the first heating temperature is greater than the second heating temperature.

4. The method according to claim 2 or 3, characterized in that The refrigeration device further includes a first temperature sensor, which is disposed on the evaporator and is used to collect the evaporator temperature. After controlling the PTC heating element to heat at the first target heating temperature, the method further includes: The evaporator temperature collected by the first temperature sensor is acquired, and the first target heating temperature is corrected according to the evaporator temperature.

5. The method according to claim 4, characterized in that The acquiring the evaporator temperature acquired by the first temperature sensor and correcting the first target heating temperature according to the evaporator temperature includes: When it is monitored that the evaporator temperature is greater than or equal to a first preset temperature, controlling to reduce the first target heating temperature; When it is monitored that the evaporator temperature is less than or equal to a second preset temperature, the first target heating temperature is controlled to increase.

6. The method according to claim 1, characterized in that After controlling the PTC heating element to be turned off, the method includes: monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second preset pressure difference; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second preset pressure difference, the defrost mode is controlled to be turned off.

7. The method according to claim 1, characterized in that The PTC heating element includes a first PTC heater and a second PTC heater, the first PTC heater is arranged on the upper part of the evaporator, and the second PTC heater is arranged on the bottom of the evaporator; Correspondingly, after determining the first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature, the method includes: Controlling the first PTC heater to start and perform heating at the first target heating temperature; monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a first set pressure difference; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first set pressure difference, a second target heating temperature of the PTC heating element is determined based on the pressure difference and the relationship between the preset pressure difference and the heating temperature, and the second PTC heater is controlled to start and heat at the second target heating temperature, wherein the first target heating temperature is greater than the second target heating temperature; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, the first PTC heater and the second PTC heater are controlled to be turned off.

8. The method according to claim 1, characterized in that The PTC heating element includes a first PTC heater and a second PTC heater, the first PTC heater is arranged on the upper part of the evaporator, and the second PTC heater is arranged on the bottom of the evaporator; Correspondingly, after determining the first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature, the method includes: Controlling the first PTC heater to start and perform heating at the first target heating temperature; monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a second set pressure difference; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the second set pressure difference, determining the second target heating temperature of the PTC heating element according to the pressure difference and the relationship between the preset pressure difference and the heating temperature; controlling the first PTC heater to be turned off, and controlling the second PTC heater to be turned on and to perform heating at the second target heating temperature; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, the second PTC heater is controlled to be turned off.

9. The method according to claim 1, characterized in that The PTC heating element includes a first PTC heater and a second PTC heater, the first PTC heater is arranged on the upper part of the evaporator, and the second PTC heater is arranged on the bottom of the evaporator; Correspondingly, after determining the first target heating temperature of the PTC heating element according to the pressure difference and the preset relationship between the pressure difference and the heating temperature, the method includes: Controlling the first PTC heater to start and perform heating at the first target heating temperature; monitoring whether the pressure difference between the upper and lower sides of the evaporator is less than or equal to a third set pressure difference; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the third set pressure difference, determining the second target heating temperature of the PTC heating element according to the pressure difference and the relationship between the preset pressure difference and the heating temperature; controlling the first PTC heater to switch to heating at the second target heating temperature, and controlling the second PTC heater to start and heat at the second target heating temperature, wherein the first target heating temperature is greater than the second target heating temperature; When it is monitored that the pressure difference between the upper and lower sides of the evaporator is less than or equal to the first preset pressure difference, the first PTC heater and the second PTC heater are controlled to be turned off.

10. A refrigeration device, characterized in that: include: The box body, which serves as the supporting structure of the refrigeration unit, has several compartments inside; A refrigeration system is provided in the box, and the refrigeration system includes an evaporator; A PTC heating element is provided on the evaporator, and the PTC heating element is energized to generate heat to melt the frost condensed on the evaporator; The pressure detection device includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is arranged at the upper part of the evaporator and is used to collect the upper pressure of the evaporator; the second pressure sensor is arranged at the lower part of the evaporator and is used to collect the lower pressure of the evaporator; A controller is electrically connected to the PTC heating element and the pressure detection device, and the controller is used to execute the defrost control method according to any one of claims 1 to 9.

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