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 controls one or more PTC heaters to heat at different temperatures according to the temperatures of different directions of an evaporator collected by respective temperature sensors, or controls respective PTC heaters to heat at different temperatures by switching different heating gears, can effectively shorten the defrosting time, improve the defrosting efficiency, reduce the power consumption, reduce the temperature fluctuation amplitude in the refrigerator during defrosting, and improve the food storage quality.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a refrigeration device and its defrosting control method. Background Technology

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

[0003] In related technologies, a refrigerator typically includes a cabinet containing a freezer compartment and a refrigerator compartment for storing food, beverages, or other items that need to be kept at low temperatures. The cabinet also houses a refrigeration system, which cools both the freezer and refrigerator compartments. This system includes a compressor, evaporator, condenser, and throttling elements. Due to the unique working principle of refrigerator refrigeration, the refrigerant absorbs heat as it evaporates in the evaporator, causing varying degrees of frost to form on its surface. If defrosting is not performed promptly, the frost layer on the evaporator surface will gradually thicken, reducing cooling capacity and lowering the refrigerator's efficiency. Therefore, refrigerators require defrosting.

[0004] However, existing technologies typically use heating elements at the bottom of the evaporator, which often leads to uneven defrosting. This can result in the bottom of the evaporator overheating before the frost on top has completely melted. Furthermore, because the heating elements take a long time and generate a lot of heat during defrosting, the internal temperature can rise excessively, affecting defrosting efficiency, wasting resources, and impacting the quality of food stored inside. Summary of the Invention

[0005] The main objective of this application is to propose a refrigeration device and its defrosting control method. Based on the temperature of the evaporator at different locations collected by various temperature sensors, the method controls one or more PTC heaters to be used for heating at different temperatures, or controls each PTC heater to switch to different heating levels at different temperatures. This can effectively shorten defrosting time, improve defrosting efficiency, reduce energy consumption, reduce temperature fluctuations inside the refrigerator during defrosting, and improve the quality of food storage.

[0006] To achieve the above objectives, this application proposes a defrosting control method for a refrigeration device, the refrigeration device comprising:

[0007] The housing, which serves as the supporting structure for the refrigeration unit, has several compartments inside;

[0008] A refrigeration system is located inside the enclosure, and the refrigeration system includes an evaporator;

[0009] The heating element comprises a plurality of PTC heaters, each of which is arranged at a different position of the evaporator, and each of the PTC heaters generates heat when powered to melt the frost condensed on the evaporator;

[0010] The temperature detection device comprises at least one temperature sensor, each of which is arranged at a different position of the evaporator, and each of the temperature sensors is used to collect the temperature at the different position of the evaporator;

[0011] The infrared sensor is arranged below the evaporator and is used to detect whether there is water dripping below the evaporator;

[0012] The defrosting control method comprises:

[0013] After the defrosting mode is started, the temperature at the different position of the evaporator collected by each of the temperature sensors is used to control one or more PTC heaters in the heating element to generate heat at different temperatures, or each of the PTC heaters is controlled to switch to different heating gears to generate heat at different temperatures;

[0014] After the heating is completed, the infrared sensor is used to monitor the dripping state below the evaporator, and the dripping time is accumulated, so that the defrosting mode is controlled to be turned off when the dripping time is greater than or equal to a preset time.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] According to the temperature at the different position of the evaporator collected by each of the temperature sensors, one or more PTC heaters in the heating element are controlled to generate heat at different temperatures, or each of the PTC heaters is controlled to switch to different heating gears to generate heat at different temperatures, which can effectively shorten the defrosting time, improve the defrosting efficiency, reduce the power consumption, reduce the temperature fluctuation amplitude in the refrigerator during defrosting, and improve the food storage quality. By monitoring whether the dripping time exceeds the preset time, it can be determined whether the frost is completely melted, so that the defrosting mode can be turned off in time when it is determined that the frost on the evaporator is completely melted.

[0017] In an embodiment of the present application, the heating element comprises a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device comprises a first temperature sensor arranged on the evaporator and used to collect the temperature of the evaporator;

[0018] Correspondingly, after starting the defrosting mode, the heating of one or more PTC heaters in the heating element at different temperatures is controlled according to the temperatures of different positions of the evaporator collected by the respective temperature sensors.

[0019] After starting the defrosting mode, the first PTC heater is controlled to start heating.

[0020] Monitoring whether the evaporator temperature collected by the first temperature sensor is greater than or equal to a first preset temperature;

[0021] When it is monitored that the evaporator temperature is greater than or equal to the first preset temperature, the second PTC heater is controlled to start heating.

[0022] Monitoring whether the evaporator temperature is greater than or equal to a second preset temperature, wherein the second preset temperature is greater than the first preset temperature.

[0023] When it is monitored that the evaporator temperature is greater than or equal to the second preset temperature, the first PTC heater and the second PTC heater are controlled to be turned off.

[0024] The above technical solution has the following advantages or beneficial effects:

[0025] After starting the defrosting mode, the first PTC heater arranged at the upper part of the evaporator is controlled to start heating to preferentially melt the frost on the upper part of the evaporator. At this time, the water generated by melting flows down along the evaporator due to gravity, so that the residual heat contained in the water is transferred to the frost on the lower part of the evaporator to melt a part of the frost on the lower part of the evaporator in advance. During the heating process of the first PTC heater, the evaporator temperature gradually rises, and when it is monitored that the evaporator temperature is greater than or equal to the first preset temperature, it can be indicated to some extent that the frost on the upper part of the evaporator has been melted by more than half, but the frost on the lower part of the evaporator has not been melted basically. At this time, the second PTC heater arranged at the bottom of the evaporator is also controlled to start heating to melt the frost on the bottom of the evaporator, and at this time, the first PTC heater and the second PTC heater simultaneously melt the frost on the upper part and the lower part of the evaporator to improve the defrosting efficiency. When it is monitored that the evaporator temperature is greater than or equal to the second preset temperature, it indicates that the frost on the evaporator has been melted almost completely, and at this time, the first PTC heater and the second PTC heater are controlled to be turned off to use the residual heat in the heating element and the evaporator chamber to completely melt the remaining frost on the evaporator. The first PTC heater and the second PTC heater are turned off in advance when the frost on the evaporator has not been completely melted, which can reduce the influence of the defrosting hot air flow on the temperature in the freezing compartment.

[0026] In an embodiment of the present application, the heating element comprises a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper portion of the evaporator, and the second PTC heater is arranged at the bottom portion of the evaporator; the temperature detection device comprises a first temperature sensor arranged at the evaporator for collecting the temperature of the evaporator;

[0027] Correspondingly, after starting the defrosting mode, the PTC heaters are controlled to switch different heating gears at different temperatures according to the temperatures of different positions of the evaporator collected by the respective temperature sensors.

[0028] After starting the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear.

[0029] It is monitored whether the temperature of the evaporator collected by the first temperature sensor is greater than or equal to a first preset temperature.

[0030] When it is monitored that the temperature of the evaporator is greater than or equal to the first preset temperature, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater is controlled to start and heat at a high temperature gear.

[0031] It is monitored whether the temperature of the evaporator is greater than or equal to a second preset temperature, wherein the second preset temperature is greater than the first preset temperature.

[0032] When it is monitored that the temperature of the evaporator is greater than or equal to the second preset temperature, the first PTC heater and the second PTC heater are controlled to be turned off.

[0033] The above technical solution has the following advantages or beneficial effects:

[0034] In the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear to preferentially melt the frost on the upper part of the evaporator. At this time, the water produced by melting flows down along the evaporator due to gravity, so that the residual heat contained in the water is transferred to the frost on the lower part of the evaporator to melt a part of the frost on the lower part of the evaporator in advance. During the heating of the first PTC heater, the temperature of the evaporator gradually rises, and when it is monitored that the temperature of the evaporator is greater than or equal to a first preset temperature, it can be indicated that the frost on the upper part of the evaporator has been melted by about half, but the frost on the lower part of the evaporator has not been melted basically. At this time, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater arranged at the bottom of the evaporator is controlled to start and heat at a high temperature gear to melt the frost on the upper and lower parts of the evaporator. At this time, since the second PTC heater starts to heat at a high temperature gear, it 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. Therefore, adjusting the first PTC heater to switch to heat at a low temperature gear can reduce power consumption and prevent the upper part of the evaporator from overheating due to continuous high-temperature heating, thereby reducing the influence of hot air flow on the temperature in the freezing compartment. When it is monitored that the temperature of the evaporator is greater than or equal to a second preset temperature, it indicates that the frost on the evaporator has been almost melted. At this time, the first PTC heater and the second PTC heater are controlled to be turned off, and the residual heat in the heating element and the evaporator chamber is used to completely melt the remaining frost on the evaporator. The first PTC heater and the second PTC heater are turned off in advance when the frost on the evaporator has not been completely melted, which can reduce the influence of defrosting hot air flow on the temperature in the freezing compartment.

[0035] In an embodiment of the present application, the heating element includes a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device includes a second temperature sensor and a third temperature sensor, the second temperature sensor is arranged at the upper part of the evaporator and is used to collect the temperature of the upper part of the evaporator, and the third temperature sensor is arranged at the middle of the evaporator and is used to collect the temperature of the middle of the evaporator;

[0036] Correspondingly, in the defrosting mode, according to the temperatures of different parts of the evaporator collected by each temperature sensor, one or more PTC heaters in the heating element are controlled to heat at different temperatures, including:

[0037] After the defrosting mode is started, the first PTC heater is controlled to start heating;

[0038] It is monitored whether the temperature of the upper part of the evaporator collected by the second temperature sensor is greater than or equal to a first set temperature;

[0039] when the upper temperature of the evaporator is monitored to be greater than or equal to the first set temperature, the first PTC heater is controlled to be turned off, and the second PTC heater is controlled to be started to heat;

[0040] whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to a second set temperature is monitored;

[0041] when the middle temperature of the evaporator is monitored to be greater than or equal to the second set temperature, the second PTC heater is controlled to be turned off.

[0042] The above technical solution has the following advantages or beneficial effects:

[0043] After the defrosting mode is started, the first PTC heater arranged at the upper part of the evaporator is controlled to be started to heat, so as to preferentially melt the frost on the upper part of the evaporator. At this time, the water generated by melting flows downward along the evaporator due to the gravity, so that the residual heat contained in the water is transferred to the frost on the lower part of the evaporator, so as to melt a part of the frost on the lower part of the evaporator in advance. During the heating process of the first PTC heater, the upper temperature of the evaporator gradually increases. When the upper temperature of the evaporator is monitored to be greater than or equal to the first set temperature, it can be indicated to some extent that the frost on the upper part of the evaporator is basically melted, but the frost on the lower part of the evaporator is basically not melted. At this time, the first PTC heater is controlled to be turned off, and the second PTC heater arranged at the bottom of the evaporator is controlled to be started to heat, so as to melt the frost on the upper part and the lower part of the evaporator. At this time, since the second PTC heater is started to heat, the frost on the upper part of the evaporator can also be melted to some extent when the frost on the lower part of the evaporator is melted. Therefore, the first PTC heater is controlled to be turned off to stop heating, so as to reduce the power consumption, prevent the upper part of the evaporator from being overheated due to continuous heating, and reduce the influence of the hot air flow on the temperature in the freezing compartment. When the middle temperature of the evaporator is monitored to be greater than or equal to the second set temperature, it indicates that the frost on the evaporator is almost melted. At this time, the second PTC heater is controlled to be turned off, and the residual frost on the evaporator is completely melted by using the residual heat in the heating element and the evaporator chamber. The second PTC heater is turned off in advance when the frost on the evaporator is not completely melted, so as to reduce the influence of the defrosting hot air flow on the temperature in the freezing compartment.

[0044] In an embodiment of the present application, the heating element comprises a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device comprises a second temperature sensor and a third temperature sensor, the second temperature sensor is arranged at the upper part of the evaporator and is used to collect the upper temperature of the evaporator, and the third temperature sensor is arranged at the middle of the evaporator and is used to collect the middle temperature of the evaporator.

[0045] Correspondingly, after starting the defrosting mode, the control of the respective PTC heaters to heat at different temperatures and corresponding switching of different heating gears according to the temperatures of different positions of the evaporator collected by the respective temperature sensors comprises:

[0046] After starting the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear;

[0047] Monitoring whether the upper temperature of the evaporator collected by the second temperature sensor is greater than or equal to a first set temperature;

[0048] When it is monitored that the upper temperature of the evaporator is greater than or equal to the first set temperature, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater is controlled to start and heat at a high temperature gear;

[0049] Monitoring whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to a second set temperature;

[0050] When it is monitored that the middle temperature of the evaporator is greater than or equal to the second set temperature, the second PTC heater is controlled to switch to heat at a low temperature gear;

[0051] Monitoring whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to a third set temperature;

[0052] When it is monitored that the middle temperature of the evaporator is greater than or equal to the third set temperature, the first PTC heater is controlled to be turned off;

[0053] Monitoring whether the upper temperature of the evaporator collected by the second temperature sensor is greater than or equal to a fourth set temperature;

[0054] When it is monitored that the upper temperature of the evaporator is greater than or equal to the fourth set temperature, the second PTC heater is controlled to be turned off.

[0055] The above technical solution has the following advantages or beneficial effects:

[0056] After the defrosting mode is started, the first PTC heater arranged at the upper part of the evaporator is controlled to start and heat at a high temperature gear 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 of the first PTC heater, the temperature at the upper part of the evaporator gradually increases, and when it is monitored that the temperature at the upper part of the evaporator is greater than or equal to a first set temperature, it can be indicated that the frost at the upper part of the evaporator has been melted by about half, but the frost at the lower part of the evaporator has not been melted basically. At this time, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater arranged at the bottom of the evaporator is controlled to start and heat at a high temperature gear to melt the frost at the upper and lower parts of the evaporator. At this time, since the second PTC heater starts to heat at a high temperature gear, the frost at the upper part of the evaporator can also be melted to a certain extent while melting the frost at the lower part of the evaporator. Therefore, adjusting the first PTC heater to switch to heat at a low temperature gear can reduce power consumption, prevent the upper part of the evaporator from overheating due to continuous high-temperature heating, and reduce the influence of hot air flow on the temperature in the freezing compartment. When it is monitored that the middle temperature of the evaporator is greater than or equal to a second set temperature, it is indicated that the frost at the lower part of the evaporator has also been melted by about half. At this time, the second PTC heater is controlled to switch to continue heating at a low temperature gear to reduce power consumption, prevent the lower part of the evaporator from overheating due to continuous high-temperature heating, and reduce the influence of hot air flow on the temperature in the freezing compartment. When it is monitored that the middle temperature of the evaporator is greater than or equal to a third set temperature, it is indicated that the frost at the upper part of the evaporator has been melted basically. At this time, the first PTC heater is controlled to be turned off, and the second PTC heater continues to heat at a low temperature gear. When it is monitored that the temperature at the upper part of the evaporator is greater than or equal to a fourth set temperature, it is indicated that the frost on the evaporator has been melted basically. At this time, the second PTC heater is controlled to be turned off, and the residual frost on the evaporator is completely melted by using the residual heat in the heating element and the evaporator chamber. The first PTC heater and the second PTC heater are turned off in advance when the frost on the evaporator has not been completely melted, which can reduce the influence of defrosting hot air flow on the temperature in the freezing compartment.

[0057] In an embodiment of the present application, the temperature detection device further comprises a fourth temperature sensor arranged at the bottom of the evaporator for collecting the bottom temperature of the evaporator. After the second PTC heater is controlled to be turned off, the method comprises:

[0058] monitoring the absolute value of the temperature difference between the upper temperature of the evaporator collected by the second temperature sensor and the bottom temperature of the evaporator collected by the fourth temperature sensor;

[0059] When the absolute value of the temperature difference between the upper portion temperature and the bottom portion temperature of the evaporator is less than or equal to a preset temperature difference, the defrosting mode is controlled to be closed.

[0060] The above technical solution has the following advantages or beneficial effects:

[0061] After the second PTC heater is controlled to be closed, the residual ice and frost of the evaporator can be melted by using the residual heat in the heating member and the evaporator chamber. At this time, whether the ice and frost are completely melted can be effectively determined by monitoring whether the absolute value of the temperature difference between the upper portion temperature and the bottom portion temperature of the evaporator is less than or equal to a preset temperature difference. Specifically, when the absolute value of the temperature difference between the upper portion temperature and the bottom portion temperature of the evaporator is less than or equal to the preset temperature difference, it can be determined that the ice and frost of the evaporator are completely melted. At this time, the defrosting mode can be controlled to be closed to end the defrosting.

[0062] In an embodiment of the present application, the heating member includes a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper portion of the evaporator, and the second PTC heater is arranged at the bottom portion of the evaporator. The temperature detection device includes a second temperature sensor and a fourth temperature sensor, the second temperature sensor is arranged at the upper portion of the evaporator and is used to collect the upper portion temperature of the evaporator, and the fourth temperature sensor is arranged at the lower portion of the evaporator and is used to collect the lower portion temperature of the evaporator.

[0063] Correspondingly, after the defrosting mode is started, the PTC heaters are controlled to be correspondingly switched to different heating gears at different temperatures according to the temperatures of different positions of the evaporator collected by the temperature sensors, including:

[0064] After the defrosting mode is started, the first PTC heater is controlled to be started and heated at a high temperature gear.

[0065] The upper portion temperature of the evaporator collected by the second temperature sensor is monitored to be greater than or equal to a first temperature threshold value.

[0066] When the upper portion temperature of the evaporator is monitored to be greater than or equal to the first temperature threshold value, the first PTC heater is controlled to be switched to a low temperature gear, and the second PTC heater is controlled to be started and heated at a high temperature gear.

[0067] The bottom portion temperature of the evaporator collected by the fourth temperature sensor is monitored to be greater than or equal to a second temperature threshold value.

[0068] When the bottom portion temperature of the evaporator is monitored to be greater than or equal to the second temperature threshold value, the second PTC heater is controlled to be switched to a low temperature gear.

[0069] monitoring whether the bottom temperature of the evaporator collected by the fourth temperature sensor is greater than or equal to a third temperature threshold value;

[0070] when it is monitored that the bottom temperature of the evaporator is greater than or equal to the third temperature threshold value, controlling the first PTC heater and the second PTC heater to be turned off.

[0071] The above technical solution has the following advantages or beneficial effects:

[0072] After the defrosting mode is started, the first PTC heater arranged at the upper part of the evaporator is controlled to be started and heated at a high temperature gear to preferentially melt the ice and frost at the upper part of the evaporator. At this time, the water generated by melting flows downward along the evaporator due to the gravity, so that the residual heat contained in the water is transferred to the ice and frost at the lower part of the evaporator to melt a part of the ice and frost at the lower part of the evaporator in advance. During the heating process of the first PTC heater, the temperature at the upper part of the evaporator gradually rises. When it is monitored that the temperature at the upper part of the evaporator is greater than or equal to a first temperature threshold value, it can be indicated to some extent that the ice and frost at the upper part of the evaporator has been melted by more than half, but the ice and frost at the lower part of the evaporator has not been melted basically. At this time, the first PTC heater is controlled to be switched to be heated at a low temperature gear, and the second PTC heater arranged at the bottom of the evaporator is controlled to be started and heated at a high temperature gear to melt the ice and frost at the upper part and the lower part of the evaporator. At this time, since the second PTC heater is started at a high temperature gear, the ice and frost at the upper part of the evaporator can also be melted to some extent while the ice and frost at the lower part of the evaporator is melted. Therefore, adjusting the first PTC heater to be switched to be heated at a low temperature gear can reduce power consumption, prevent the upper part of the evaporator from being overheated due to continuous heating at a high temperature, and reduce the influence of hot air flow on the temperature in the freezing compartment. When it is monitored that the bottom temperature of the evaporator is greater than or equal to a second temperature threshold value, it indicates that the ice and frost at the lower part of the evaporator has also been melted by more than half. At this time, the second PTC heater is controlled to be switched to continue to be heated at a low temperature gear, which can reduce power consumption, prevent the lower part of the evaporator from being overheated due to continuous heating at a high temperature, and reduce the influence of hot air flow on the temperature in the freezing compartment. When it is monitored that the bottom temperature of the evaporator is greater than or equal to a third temperature threshold value, it indicates that the ice and frost of the evaporator has been basically melted. At this time, the first PTC heater and the second PTC heater are controlled to be turned off, and the residual heat in the heating element and the evaporator chamber is used to completely melt the remaining ice and frost of the evaporator. The first PTC heater and the second PTC heater are turned off in advance when the ice and frost on the evaporator has not been completely melted, which can reduce the influence of defrosting hot air flow on the temperature in the freezing compartment.

[0073] In an embodiment of the present application, after the heating is completed, the state of water dripping under the evaporator is monitored by the infrared sensor, and the water dripping time is accumulated, so as to control the defrosting mode to be turned off when the water dripping time is greater than or equal to a preset time, which comprises:

[0074] After controlling the first PTC heater and the second PTC heater to be both closed, the drip water state under the evaporator is monitored by the infrared sensor, and the drip water time is started to be accumulated;

[0075] When it is monitored that the drip water time is greater than or equal to a preset time, the defrosting mode is controlled to be closed.

[0076] The above technical solution has the following advantages or beneficial effects:

[0077] After controlling the first PTC heater and the second PTC heater to be both closed, the drip water state under the evaporator is monitored by the infrared sensor, and the drip water time is started to be accumulated;

[0078] To achieve the above object, the embodiment of the present application provides a refrigeration device, comprising:

[0079] A cabinet serving as a support structure of the refrigeration device, and internally provided with a plurality of compartments;

[0080] A refrigeration system provided in the cabinet, and comprising an evaporator;

[0081] A heating member comprising a plurality of PTC heaters, each of which is arranged at a different position of the evaporator, and each of which is powered to generate heat so as to melt the frost condensed on the evaporator;

[0082] A temperature detection device comprising at least one temperature sensor, each of which is arranged at a different position of the evaporator, and each of which is used to collect the temperature at the different position of the evaporator;

[0083] An infrared sensor arranged below the evaporator, and used to detect whether there is drip water under the evaporator;

[0084] A controller electrically connected with the heating member, the temperature detection device and the infrared sensor, and used to execute the defrosting control method according to any one of the embodiments of the present application.

[0085] The above technical solution has the following advantages or beneficial effects:

[0086] Since the controller of the refrigerating device can perform the defrosting control method described in any embodiment of the present application, the PTC heater(s) can be controlled to heat at different temperatures or each PTC heater can be controlled to switch to different heating gears at different temperatures according to the temperatures of different positions of the evaporator collected by the temperature sensors, so that the defrosting time can be effectively shortened, the defrosting efficiency can be improved, the power consumption can be reduced, the temperature fluctuation range in the refrigerator during defrosting can be reduced, and the food storage quality can be improved.

[0087] In an embodiment of the present application, the heating member includes a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper portion of the evaporator, the second PTC heater is arranged at the bottom portion of the evaporator, the temperature detection device includes a first temperature sensor, the first temperature sensor is arranged at the evaporator and used to collect the evaporator temperature, and the first PTC heater, the second PTC heater and the first temperature sensor are electrically connected to the controller.

[0088] The above technical solution has the following advantages or beneficial effects:

[0089] By arranging the first PTC heater at the upper portion of the evaporator, arranging the second PTC heater at the bottom portion of the evaporator, and arranging the first temperature sensor at the evaporator to collect the evaporator temperature, the first PTC heater and the second PTC heater can be controlled to heat the evaporator based on the evaporator temperature collected by the first temperature sensor, so that combined defrosting can be realized, and the uniformity of defrosting can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0090] Figure 1 FIG. 1 is a front side perspective view of a refrigerating device according to an embodiment of the present application.

[0091] Figure 2 FIG. 4 is a sectional view of the refrigerating device of FIG. 1. Figure 1

[0092] Figure 3 FIG. 6 is a first schematic view of an evaporator according to an embodiment of the present application.

[0093] Figure 4 FIG. 7 is a second schematic view of the evaporator according to an embodiment of the present application.

[0094] Figure 5 FIG. 8 is a flowchart of a defrosting control method according to an embodiment of the present application.

[0095] Figure 6 FIG. 9 is a flowchart of a defrosting control method according to an embodiment of the present application.

[0096] Figure 7 ​is a flow chart of the defrosting control method provided in Embodiment Two of the present application.

[0097] Figure 8 is a flow chart of the defrosting control method provided in Embodiment Three of the present application.

[0098] Figure 9 is a flow chart of the defrosting control method provided in Embodiment Four of the present application.

[0099] Figure 10 is a flow chart of the defrosting control method provided in Embodiment Five of the present application.

[0100] Reference Signs:

[0101] Box 1, refrigeration chamber 11, freezing chamber 12, compressor chamber 13, box door 14, compressor 21, evaporator 22, first PTC heater 31, second PTC heater 32, third PTC heater 33, fourth PTC heater 34, first temperature sensor 41, second temperature sensor 42, third temperature sensor 43, fourth temperature sensor 44. DETAILED DESCRIPTION

[0102] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0103] It should be noted that although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be executed in a manner different from the module division in the device or the order in the flow chart. The terms "first", "second", etc. in the specification and claims and the above drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence.

[0104] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0105] Refrigerators have become an essential household appliance in people's daily life. Currently, the defrosting methods of refrigerators mainly include electric heating defrosting.

[0106] However, the inventors discovered that existing defrosting methods have at least the following problems: Electric defrosting, which uses steel pipe heaters, has a high defrosting temperature and mainly relies on the principle of thermal radiation to transfer heat from bottom to top and defrost. This results in uneven defrosting, and the heat utilization rate of this method is low. A significant proportion of the heat will overflow, greatly increasing the temperature of the storage compartment, which is not conducive to food preservation and will also increase the energy consumption of temperature pulling during defrosting and recooling.

[0107] Based on this, this application proposes a defrosting control method for a refrigeration device, which aims to replace the steel pipe heater with a PTC heater. According to the temperature of different positions of the evaporator collected by each temperature sensor, one or more PTC heaters are used for heating at different temperatures, or each PTC heater is controlled to switch different heating levels at different temperatures. This can effectively shorten the defrosting time, improve the defrosting efficiency, reduce power consumption, reduce the temperature fluctuation range inside the refrigerator during defrosting, and improve the quality of food storage.

[0108] The refrigeration device in this application embodiment can be a freezer, refrigerator, bar cabinet, or other refrigeration cabinet. The following uses a refrigerator as an example to describe in detail the improved technical solution of the refrigeration device in this application embodiment.

[0109] Figure 1 This is a front perspective view of a refrigeration device according to an embodiment of this application. Figure 2 for Figure 1 A cross-sectional view.

[0110] Please see Figures 1 to 2 As shown, the refrigerator provided in this embodiment may include a cabinet 1. The cabinet 1 may have 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 may also have a hollow shell structure of other shapes.

[0111] Please see Figure 2 As shown, in some embodiments, the interior of the housing 1 may include a refrigerator compartment 11 and a freezer compartment 12. The refrigerator compartment 11 and the freezer compartment 12 may be configured as multiple storage compartments.

[0112] Please see Figure 2 As shown, in some embodiments, the refrigerator compartment 11 and the freezer compartment 12 can be used as independent storage spaces to meet different refrigeration needs such as freezing and refrigeration according to different types of food, and to store items that need to be refrigerated or frozen. The refrigerator compartment 11 and the freezer compartment 12 can be arranged vertically or horizontally.

[0113] Please see Figure 2 As shown, in some embodiments, the refrigerator may include a refrigerator liner. A refrigerator compartment 11 and a freezer compartment 12 may be formed within the refrigerator liner.

[0114] Referring to Figure 2 As shown in some embodiments, the refrigerator can include a box door 14. The box door 14 can be hinged to the front side of the box body 1 for opening and closing the refrigerating compartment 11 and the freezing compartment 12.

[0115] It should be noted that the box door 14 can be provided in multiple. 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.

[0116] Referring to Figure 2 As shown in some embodiments, the refrigerator can include a refrigeration system. The refrigeration system can be provided inside the box body 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 mainly includes 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 the effect of refrigeration.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] In some embodiments, the compressor, the condenser, the throttling device, and the 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 box body 1.

[0121] In some embodiments, referring to Figure 2The cabinet 1 may contain a compressor chamber 13. A compressor 21 may be installed inside the compressor chamber 13. The compressor chamber 13 may be located in the bottom area of ​​the cabinet 1. The compressor chamber 13 may be located below the rear side of the freezer compartment 12. The compressor, condenser, throttling device, etc., may be installed inside the cabinet 1.

[0122] It should be noted that in some other embodiments, the compressor chamber 13 may also be located at the top or side of the housing 1.

[0123] In some embodiments, please refer to Figure 3 As shown, Figure 3 This is a first schematic diagram of an evaporator provided in one embodiment of this application. The refrigeration system may include an evaporator 22. A throttling device may deliver a throttled and depressurized refrigerant into the evaporator 22. The evaporator 22 may be used for the refrigerant vapor to evaporate and boil, thereby absorbing heat from the surrounding medium.

[0124] In some embodiments, the refrigerator may further include a heating element, which may include a plurality of PTC heaters. (See reference...) Figure 3 Each PTC heater can be positioned at a different location on the evaporator 22. When energized, each PTC heater heats up, melting the frost that condenses on the evaporator 22. For example, a first PTC heater 31 can be installed at the top of the evaporator 22, and a second PTC heater 32 at the bottom. A third PTC heater 33 can also be installed on the left side of the evaporator 22, a fourth PTC heater 34 on the right side, and a fifth PTC heater (not shown in the figure) in the middle. This allows for combined heating and defrosting, ensuring uniform defrosting.

[0125] The PTC heater comprises a PTC thermistor, and the PTC thermistor has a constant temperature heating characteristic. After the PTC thermistor is powered, the PTC thermistor is self-heated to a jump region, and the surface temperature of the PTC thermistor is kept constant by constant temperature heating. The temperature is only related to the Curie temperature of the PTC thermistor and the applied voltage, and is basically independent of the ambient temperature. The PTC heater is a heating device designed by using the constant temperature heating characteristic of the PTC thermistor. In the case of small and medium power heating, the PTC heater has the advantages of constant temperature heating, no open flame, high heat conversion rate, little influence of power voltage, long natural life, and the like, which cannot be compared with traditional heating elements. One of the prominent features is safety performance. When the fan fails to stop, the power of the PTC heater will automatically decrease sharply because the PTC heater cannot be fully cooled, and the surface temperature of the heater is maintained at the Curie temperature (generally about 250 DEG C). The PTC heater has a power automatic adjustment function, and the ordinary heating wire does not have the function. When the heat dissipation condition changes, the temperature change of the PTC heater is small, that is, the PTC heater has a constant temperature function, and the temperature change of the ordinary heating wire is large, and the ordinary heating wire does not have a constant temperature function.

[0126] In some embodiments, the refrigerator can further comprise a temperature detection device comprising at least one temperature sensor, each temperature sensor can be respectively arranged at different positions of the evaporator, and each temperature sensor is used to collect the temperature at different positions of the evaporator. Thus, based on the temperature at different positions of the evaporator detected by the temperature detection device, one or more PTC heaters in the heating member can be controlled to be heated at different temperatures, or each PTC heater can be controlled to switch different heating gears to be heated at different temperatures.

[0127] In some embodiments, referring to Figure 3 , the temperature detection device comprises a first temperature sensor 41 arranged at the evaporator 22 and used to collect the temperature of the evaporator. Thus, based on the temperature of the evaporator collected by the first temperature sensor 41, one or more PTC heaters in the heating member can be controlled to be heated at different temperatures, or each PTC heater can be controlled to switch different heating gears to be heated at different temperatures.

[0128] In some embodiments, referring to Figure 4 , the temperature detection device comprises a first temperature sensor 41 arranged at the evaporator 22 and used to collect the temperature of the evaporator. Thus, based on the temperature of the evaporator collected by the first temperature sensor 41, one or more PTC heaters in the heating member can be controlled to be heated at different temperatures, or each PTC heater can be controlled to switch different heating gears to be heated at different temperatures. Figure 4A second schematic view of the evaporator is provided in an embodiment of the present application. The temperature detection device can include a second temperature sensor 42 and a third temperature sensor 43. The second temperature sensor 42 is arranged at an upper portion of the evaporator 22 to collect an upper portion temperature of the evaporator 22. The third temperature sensor 43 is arranged at a middle portion of the evaporator 22 to collect a middle portion temperature of the evaporator 22. Thus, the one or more PTC heaters in the heating member can be controlled to be heated at different temperatures, or the respective PTC heaters can be controlled to switch different heating gears to be heated at different temperatures, based on the upper portion temperature of the evaporator 22 collected by the second temperature sensor 42 and the middle portion temperature of the evaporator 22 collected by the third temperature sensor 43.

[0129] In some embodiments, the temperature detection device can further include a fourth temperature sensor 44 arranged at a bottom portion of the evaporator 22 to collect a bottom portion temperature of the evaporator 22. Thus, the one or more PTC heaters in the heating member can be controlled to be heated at different temperatures, or the respective PTC heaters can be controlled to switch different heating gears to be heated at different temperatures, based on the upper portion temperature of the evaporator 22 collected by the second temperature sensor 42 and the bottom portion temperature of the evaporator 22 collected by the fourth temperature sensor 44. The defrosting completion of the evaporator can also be determined based on the upper portion temperature of the evaporator 22 collected by the second temperature sensor 42 and the bottom portion temperature of the evaporator 22 collected by the fourth temperature sensor 44, so as to timely turn off the defrosting mode.

[0130] Reference Figure 5 , Figure 5 A flowchart of the defrosting control method is provided in an embodiment of the present application. The refrigeration device provided in the embodiment of the present application performs, including but not limited to steps S510 to S520.

[0131] In step S510, after starting the defrosting mode, the one or more PTC heaters in the heating member are controlled to be heated at different temperatures, or the respective PTC heaters are controlled to switch different heating gears to be heated at different temperatures, based on the temperatures of different positions of the evaporator collected by the respective temperature sensors.

[0132] In step S520, after the heating is completed, the water dripping state below the evaporator is monitored by the infrared sensor, and the water dripping time is accumulated, so as to control to turn off the defrosting mode when the water dripping time is greater than or equal to a preset time.

[0133] In the embodiment of the present application, according to the temperatures of different directions of the evaporator collected by the respective temperature sensors, one or more PTC heaters are controlled to heat at different temperatures, or the respective PTC heaters are controlled to switch different heating gears to heat at different temperatures, which can effectively shorten the defrosting time, improve the defrosting efficiency, reduce the power consumption, reduce the temperature fluctuation amplitude in the refrigerator during defrosting, and improve the food storage quality. By monitoring whether the dripping time exceeds the preset time, it can be determined whether the ice and frost are completely melted, so that the defrosting mode can be controlled to be turned off in time when it is determined that the ice and frost of the evaporator are completely melted.

[0134] Embodiment one

[0135] Reference Figure 6 , Figure 6 is a flowchart of the defrosting control method provided by the embodiment one of the present application. The refrigeration device provided by the embodiment of the present application executes, including but not limited to steps S610 to S680.

[0136] Step S610, after starting the defrosting mode, the first PTC heater is controlled to start heating;

[0137] Step S620, monitoring whether the evaporator temperature collected by the first temperature sensor is greater than or equal to the first preset temperature;

[0138] Step S630, if it is monitored that the evaporator temperature is greater than or equal to the first preset temperature, the second PTC heater is controlled to start heating;

[0139] Step S640, monitoring whether the evaporator temperature is greater than or equal to the second preset temperature, wherein the second preset temperature is greater than the first preset temperature;

[0140] Step S650, if it is monitored that the evaporator temperature is greater than or equal to the second preset temperature, the first PTC heater and the second PTC heater are controlled to be turned off;

[0141] Step S660, monitoring the dripping state under the evaporator by the infrared sensor, and starting to accumulate the dripping time;

[0142] Step S670, judging whether the dripping time is greater than or equal to the preset time;

[0143] Step S680, if the dripping time is greater than or equal to the preset time, the defrosting mode is controlled to be turned off, and if the dripping time is less than the preset time, the step S670 is returned.

[0144] In the embodiments of the present application, whether the defrosting condition is met can be determined based on the evaporator temperature, the freezing chamber temperature, etc., and if the defrosting condition is met, the defrosting mode is started. After the defrosting mode is started, the first PTC heater arranged at the upper part of the evaporator is controlled to start heating, so as 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 the gravity, so that the residual heat contained in the water is transferred to the frost at the lower part of the evaporator, so as 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 evaporator temperature gradually increases, and if the evaporator temperature is less than the first preset temperature, it indicates that the frost on the evaporator has not been basically melted, and thus the first PTC heater needs to be controlled to continue heating so as to continue melting the frost on the evaporator. When it is monitored that the evaporator temperature is greater than or equal to the first preset temperature, it can be indicated to a certain extent that the frost at the upper part of the evaporator has been melted by more than half, but the frost at the lower part of the evaporator has not been basically melted. At this time, the second PTC heater arranged at the bottom of the evaporator is also controlled to start heating, so as to melt the frost at the bottom of the evaporator. At this time, the first PTC heater and the second PTC heater melt the frost at the upper part and the lower part of the evaporator at the same time, so as to improve the defrosting efficiency. During this process, the evaporator temperature continues to increase, and if the evaporator temperature is less than the second preset temperature, it indicates that the frost on the evaporator needs to be further melted, and thus the first PTC heater and the second PTC heater need to be controlled to continue heating so as to continue melting the frost on the evaporator. When it is monitored that the evaporator temperature is greater than or equal to the second preset temperature, it indicates that the frost on the evaporator has been almost melted, and thus the first PTC heater and the second PTC heater are controlled to be turned off, and the residual heat in the heating element and the evaporator cavity is utilized to completely melt the remaining frost on the evaporator. The first PTC heater and the second PTC heater are turned off in advance when the frost on the evaporator has not been completely melted, so as to reduce the influence of the defrosting hot air flow on the temperature in the freezing chamber. After the first PTC heater and the second PTC heater are turned off, the residual heat in the heating element and the evaporator cavity is utilized to melt the remaining frost on the evaporator. At this time, the water dripping condition under the evaporator can be monitored by the infrared sensor, and the water dripping time is immediately accumulated. By monitoring whether the water dripping time is greater than or equal to the preset time, whether the frost is completely melted can be effectively determined. Specifically, when the water dripping time is greater than or equal to the preset time, it can be determined that the frost on the evaporator is completely melted, and thus the defrosting mode is controlled to be turned off, so as to end the defrosting.

[0145] Embodiment Two

[0146] Reference Figure 7 , Figure 7 is a flowchart of the defrosting control method provided in the embodiments of the present application. The defrosting control method is executed by the refrigeration device provided in the embodiments of the present application, and includes but is not limited to steps S710 to S780.

[0147] Step S710: After starting the defrosting mode, control the first PTC heater to start and heat at a high temperature setting;

[0148] Step S720: Monitor whether the evaporator temperature collected by the first temperature sensor is greater than or equal to the first preset temperature;

[0149] Step S730: When the evaporator temperature is detected to be greater than or equal to the first preset temperature, the first PTC heater is controlled to switch to low temperature setting for heating, and the second PTC heater is started and heated at high temperature setting.

[0150] Step S740: Monitor whether the evaporator temperature is greater than or equal to the second preset temperature, wherein the second preset temperature is greater than the first preset temperature;

[0151] Step S750: When the evaporator temperature is detected to be greater than or equal to the second preset temperature, control the first PTC heater and the second PTC heater to shut down;

[0152] Step S760: Monitor the dripping status below the evaporator using an infrared sensor and start accumulating the dripping time;

[0153] Step S770: Determine whether the dripping time is greater than or equal to the preset time;

[0154] In step S780, if the dripping time is greater than or equal to the preset time, the defrosting mode is turned off; if the dripping time is less than the preset time, the process returns to step S770.

[0155] In the embodiments of the present application, whether the defrosting condition is met can be determined based on the evaporator temperature, the freezing chamber temperature, etc. If the defrosting condition is met, the defrosting mode is started. After the defrosting mode is started, the first PTC heater arranged at the upper part of the evaporator is controlled to start and heat at a high temperature gear to preferentially melt the ice and frost at the upper part of the evaporator. At this time, the water generated by melting flows downward along the evaporator due to the gravity, so that the residual heat contained in the water is transferred to the ice and frost at the lower part of the evaporator to melt a part of the ice and frost at the lower part of the evaporator in advance. During the heating process of the first PTC heater, the evaporator temperature gradually increases. If the evaporator temperature is less than a first preset temperature, it indicates that the ice and frost on the evaporator is not basically melted, and thus the first PTC heater needs to be controlled to continue heating to melt the ice and frost on the evaporator. When it is monitored that the evaporator temperature is greater than or equal to the first preset temperature, it can be indicated to a certain extent that the ice and frost at the upper part of the evaporator is melted by more than half, but the ice and frost at the lower part of the evaporator is not basically melted. At this time, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater arranged at the bottom of the evaporator is controlled to start and heat at a high temperature gear to melt the ice and frost at the upper and lower parts of the evaporator. At this time, since the second PTC heater starts to heat at a high temperature gear, the ice and frost at the lower part of the evaporator can be melted, and to a certain extent, the ice and frost at the upper part of the evaporator can also be melted. Therefore, adjusting the first PTC heater to switch to heat at a low temperature gear can reduce the power consumption, prevent the upper part of the evaporator from overheating due to continuous high-temperature heating, and reduce the influence of the hot air flow on the temperature in the freezing chamber. During this process, the evaporator temperature increases. If the evaporator temperature is less than a second preset temperature, it indicates that the ice and frost on the evaporator needs to be further melted, and thus the first PTC heater needs to be controlled to heat at a low temperature gear and the second PTC heater needs to be controlled to heat at a high temperature gear to continue melting the ice and frost on the evaporator. When it is monitored that the evaporator temperature is greater than or equal to the second preset temperature, it indicates that the ice and frost on the evaporator is almost melted. At this time, the first PTC heater and the second PTC heater are controlled to be turned off, and the residual heat in the heating element and the evaporator chamber is used to completely melt the remaining ice and frost on the evaporator. The first PTC heater and the second PTC heater are turned off in advance when the ice and frost on the evaporator is not completely melted, which can reduce the influence of the defrosting hot air flow on the temperature in the freezing chamber. After the first PTC heater and the second PTC heater are controlled to be turned off, the residual heat in the heating element and the evaporator chamber is used to melt the remaining ice and frost on the evaporator. At this time, the water dripping condition under the evaporator can be monitored by the infrared sensor, and the water dripping time is immediately accumulated. By monitoring whether the water dripping time is greater than or equal to a preset time, whether the ice and frost is completely melted can be effectively determined. Specifically, when the water dripping time is greater than or equal to the preset time, it can be determined that the ice and frost on the evaporator is completely melted. At this time, the defrosting mode can be controlled to be turned off to end the defrosting.

[0156] Embodiment Three

[0157] Referring toFigure 8 , Figure 8 is a flowchart of the defrosting control method provided in Embodiment Three of the present application. The defrosting control method provided in Embodiments of the present application is executed by the refrigeration device, including but not limited to steps S810 to S8100.

[0158] Step S810, after starting the defrosting mode, control the first PTC heater to start heating;

[0159] Step S820, monitor whether the upper temperature of the evaporator collected by the second temperature sensor is greater than or equal to the first set temperature;

[0160] Step S830, when it is monitored that the upper temperature of the evaporator is greater than or equal to the first set temperature, control the first PTC heater to stop heating, and control the second PTC heater to start heating;

[0161] Step S840, monitor whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to the second set temperature;

[0162] Step S850, when it is monitored that the middle temperature of the evaporator is greater than or equal to the second set temperature, control the second PTC heater to stop heating;

[0163] Step S860, monitor the water dripping state below the evaporator by the infrared sensor, and start accumulating the water dripping time;

[0164] Step S870, judge whether the water dripping time is greater than or equal to the preset time;

[0165] Step S880, if the water dripping time is greater than or equal to the preset time, control the defrosting mode to stop;

[0166] Step S890, if the water dripping time is less than the preset time, monitor the absolute value of the temperature difference between the upper temperature of the evaporator collected by the second temperature sensor and the bottom temperature of the evaporator collected by the fourth temperature sensor;

[0167] Step S8100, judge whether the absolute value of the temperature difference is less than or equal to the preset temperature difference, if the absolute value of the temperature difference is less than or equal to the preset temperature difference, execute step S880, if the absolute value of the temperature difference is greater than the preset temperature difference, return to step S890.

[0168] In this embodiment, the defrosting conditions can be determined based on the evaporator temperature and freezer temperature. If the conditions are met, the defrosting mode is activated. After the defrosting mode is activated, the first PTC heater located on the upper part of the evaporator is started to heat up, prioritizing the melting of the frost on the upper part of the evaporator. At this time, the water produced by melting flows down the evaporator due to gravity, and the residual heat contained in the water is transferred to the frost on the lower part of the evaporator, thus melting some of the frost on the lower part of the evaporator in advance. During the heating process of the first PTC heater, the temperature of the upper part of the evaporator will gradually increase. If the temperature of the upper part of the evaporator is lower than the first set temperature, it means that the frost on the evaporator has not basically melted, and the first PTC heater needs to be controlled to continue heating to continue melting the frost on the evaporator. When the temperature of the upper part of the evaporator is detected to be greater than or equal to the first set temperature, it can be indicated to a certain extent that the frost on the upper part of the evaporator has basically melted, but the frost on the lower part of the evaporator has not basically melted. At this point, the first PTC heater is turned off, and the second PTC heater located at the bottom of the evaporator is activated to melt the frost on the upper and lower parts of the evaporator. Because the second PTC heater is activated, it melts the frost on the upper part of the evaporator to some extent while melting the frost on the lower part. Therefore, turning off the first PTC heater reduces energy consumption and prevents the upper part of the evaporator from overheating due to continuous heating, thus reducing the impact of hot airflow on the temperature inside the freezer compartment. During this process, the temperature of the evaporator will continue to rise. If the temperature at the center of the evaporator is lower than the second set temperature, it indicates that the frost on the evaporator needs further melting, and the second PTC heater needs to be activated to continue melting the frost. When the temperature at the center of the evaporator is greater than or equal to the second set temperature, it indicates that the frost on the evaporator has melted sufficiently. At this point, the second PTC heater is turned off, and the remaining heat from the heating element and the evaporator chamber is used to completely melt the remaining frost. Turning off the second PTC heater before the frost on the evaporator has completely melted reduces the impact of the defrosting hot airflow on the temperature inside the freezer compartment. After the second PTC heater is turned off, the residual heat from the heating elements and the evaporator chamber can be used to melt the remaining frost on the evaporator. At this time, an infrared sensor can monitor the dripping of water below the evaporator and immediately accumulate the dripping time. By monitoring whether the dripping time is greater than or equal to a preset time, it can be effectively determined whether the frost has completely melted. Specifically, when the dripping time is greater than or equal to the preset time, it can be determined that the frost on the evaporator has completely melted. At this point, the defrosting mode can be turned off to end the defrosting process.After the second PTC heater is controlled to be turned off, whether the frost is melted completely can also be determined by monitoring whether the absolute value of the temperature difference between the upper portion of the evaporator and the bottom portion of the evaporator is less than or equal to a preset temperature difference. Specifically, when the absolute value of the temperature difference between the upper portion of the evaporator and the bottom portion of the evaporator is less than or equal to the preset temperature difference, it can be determined that the frost of the evaporator is melted completely. At this time, the defrosting mode can be controlled to be turned off to end the defrosting.

[0169] Embodiment Four

[0170] Reference Figure 9 , Figure 9 is a flowchart of the defrosting control method provided by Embodiment Four of the present application. The refrigeration device provided by the embodiments of the present application executes, including but not limited to steps S910 to S9140.

[0171] Step S910, after starting the defrosting mode, the first PTC heater is controlled to be started and heated at a high temperature gear;

[0172] Step S920, whether the upper portion temperature of the evaporator collected by the second temperature sensor is greater than or equal to a first set temperature is monitored;

[0173] Step S930, when the upper portion temperature of the evaporator is greater than or equal to the first set temperature is monitored, the first PTC heater is controlled to be switched to be heated at a low temperature gear, and the second PTC heater is controlled to be started and heated at a high temperature gear;

[0174] Step S940, whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to a second set temperature is monitored;

[0175] Step S950, when the middle temperature of the evaporator is greater than or equal to the second set temperature is monitored, the second PTC heater is controlled to be switched to be heated at a low temperature gear;

[0176] Step S960, whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to a third set temperature is monitored;

[0177] Step S970, when the middle temperature of the evaporator is greater than or equal to the third set temperature is monitored, the first PTC heater is controlled to be turned off;

[0178] Step S980, whether the upper portion temperature of the evaporator collected by the second temperature sensor is greater than or equal to a fourth set temperature is monitored;

[0179] Step S990, when the upper portion temperature of the evaporator is greater than or equal to the fourth set temperature is monitored, the second PTC heater is controlled to be turned off;

[0180] Step S9100, the water dripping state below the evaporator is monitored by an infrared sensor, and the water dripping time is started to be accumulated.

[0181] Step S9110, judging whether the dripping time is greater than or equal to the preset time;

[0182] Step S9120, if the dripping time is greater than or equal to the preset time, controlling to close the defrosting mode;

[0183] Step S9130, if the dripping time is less than the preset time, monitoring the absolute value of the temperature difference between the upper portion temperature of the evaporator collected by the second temperature sensor and the bottom portion temperature of the evaporator collected by the fourth temperature sensor;

[0184] Step S9140, judging whether the absolute value of the temperature difference is less than or equal to the preset temperature difference, if the absolute value of the temperature difference is less than or equal to the preset temperature difference, executing step S9120, if the absolute value of the temperature difference is greater than the preset temperature difference, returning to step S9130.

[0185] In the embodiments of the present application, whether the defrosting condition is met can be determined based on the evaporator temperature, the freezing chamber temperature, etc., and if the defrosting condition is met, the defrosting mode is started. After the defrosting mode is started, the first PTC heater arranged at the upper part of the evaporator is controlled to start and heat at a high temperature gear to preferentially melt the ice and frost at the upper part of the evaporator. At this time, the water generated by melting flows downward along the evaporator due to the gravity, so that the residual heat contained in the water is transferred to the ice and frost at the lower part of the evaporator to melt a part of the ice and frost at the lower part of the evaporator in advance. During the heating process of the first PTC heater, the temperature at the upper part of the evaporator gradually increases, and if the temperature at the upper part of the evaporator is less than a first set temperature, it indicates that the frost on the evaporator has not been basically melted, and thus the first PTC heater needs to be controlled to continue heating to melt the frost on the evaporator. When it is monitored that the temperature at the upper part of the evaporator is greater than or equal to the first set temperature, it can be indicated to some extent that the ice and frost at the upper part of the evaporator have been melted by about half, but the ice and frost at the lower part of the evaporator have not been basically melted. At this time, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater arranged at the bottom of the evaporator is controlled to start and heat at a high temperature gear to melt the ice and frost at the upper and lower parts of the evaporator. At this time, since the second PTC heater starts to heat at a high temperature gear, the ice and frost at the upper part of the evaporator can also be melted to some extent while the ice and frost at the lower part of the evaporator are melted, and thus adjusting the first PTC heater to switch to heat at a low temperature gear can reduce the power consumption, prevent the upper part of the evaporator from overheating due to continuous high-temperature heating, and reduce the influence of hot air flow on the temperature in the freezing compartment. During this process, the temperature of the evaporator continues to increase, and if the middle temperature of the evaporator is less than a second set temperature, it indicates that the frost on the evaporator needs to be further melted, and thus the first PTC heater needs to be controlled to continue heating at a low temperature gear and the second PTC heater needs to be controlled to continue heating at a high temperature gear to melt the frost on the evaporator. When it is monitored that the middle temperature of the evaporator is greater than or equal to the second set temperature, it indicates that the frost at the lower part of the evaporator has also been melted by about half, and thus the second PTC heater is controlled to switch to continue heating at a low temperature gear to reduce the power consumption, prevent the lower part of the evaporator from overheating due to continuous high-temperature heating, and reduce the influence of hot air flow on the temperature in the freezing compartment. During this process, the temperature of the evaporator continues to increase, and if the middle temperature of the evaporator is less than a third set temperature, it indicates that the frost on the evaporator needs to be further melted, and thus the first PTC heater needs to be controlled to continue heating at a low temperature gear and the second PTC heater needs to be controlled to continue heating at a low temperature gear to melt the frost on the evaporator. When it is monitored that the middle temperature of the evaporator is greater than or equal to the third set temperature, it indicates that the ice and frost at the upper part of the evaporator have been basically melted, and thus the first PTC heater is controlled to be turned off and the second PTC heater continues to heat at a low temperature gear.During the process, the temperature of the evaporator continues to rise, and if the temperature of the upper part of the evaporator is less than the fourth set temperature, it indicates that the frost on the upper part of the evaporator needs to be further melted, and the second PTC heater needs to be controlled to continue heating at a low temperature gear to continue melting the frost on the evaporator. When the temperature of the upper part of the evaporator is greater than or equal to the fourth set temperature, it indicates that the frost on the evaporator is basically melted, at this time, the second PTC heater is controlled to be turned off, and the remaining heat in the evaporator chamber and the heating element is used to completely melt the remaining frost on the evaporator. The first PTC heater and the second PTC heater are turned off in advance when the frost on the evaporator has not been completely melted, which can reduce the influence of the defrosting hot air flow on the temperature in the freezing compartment. After the second PTC heater is turned off, the remaining heat in the evaporator chamber and the heating element can be used to melt the remaining frost on the evaporator. At this time, the drip water condition under the evaporator can be monitored by the infrared sensor, and the drip water time is accumulated immediately. By monitoring whether the drip water time is greater than or equal to the preset time, whether the frost is completely melted can be effectively judged. Specifically, when the drip water time is greater than or equal to the preset time, it is determined that the frost on the evaporator is completely melted, at this time, the defrosting mode is controlled to be turned off to end the defrosting. After the second PTC heater is turned off, whether the frost is completely melted can also be effectively judged by monitoring whether the absolute value of the temperature difference between the upper part of the evaporator and the bottom of the evaporator is less than or equal to the preset temperature difference. Specifically, when the absolute value of the temperature difference between the upper part of the evaporator and the bottom of the evaporator is less than or equal to the preset temperature difference, it is determined that the frost on the evaporator is completely melted, at this time, the defrosting mode is controlled to be turned off to end the defrosting.

[0186] It should be noted that in the embodiments of the present application, the first set temperature and the second set temperature can be equal or not equal, and the third set temperature and the fourth set temperature can be equal or not equal, but the third set temperature is greater than the second set temperature, and the fourth set temperature is greater than the first set temperature.

[0187] Embodiment Five

[0188] Reference Figure 10 , Figure 10 is a flowchart of the defrosting control method provided by the fifth embodiment of the present application. The refrigeration device provided by the embodiments of the present application is executed, including but not limited to steps S1010 to S1080.

[0189] Step S1010, after starting the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear;

[0190] Step S1020, monitoring whether the temperature of the upper part of the evaporator collected by the second temperature sensor is greater than or equal to the first temperature threshold;

[0191] Step S1030, when the upper temperature of the evaporator is monitored to be greater than or equal to the first temperature threshold, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater is controlled to start and heat at a high temperature gear;

[0192] Step S1040, whether the bottom temperature of the evaporator collected by the fourth temperature sensor is greater than or equal to the second temperature threshold is monitored;

[0193] Step S1050, when the bottom temperature of the evaporator is monitored to be greater than or equal to the second temperature threshold, the second PTC heater is controlled to switch to heat at a low temperature gear;

[0194] Step S1060, whether the bottom temperature of the evaporator collected by the fourth temperature sensor is greater than or equal to the third temperature threshold is monitored;

[0195] Step S1070, when the bottom temperature of the evaporator is monitored to be greater than or equal to the third temperature threshold, the first PTC heater and the second PTC heater are controlled to be closed;

[0196] Step S1080, the state of water dripping below the evaporator is monitored by the infrared sensor, and the water dripping time is started to be accumulated;

[0197] Step S1090, whether the water dripping time is greater than or equal to the preset time is judged;

[0198] Step S1100, if the water dripping time is greater than or equal to the preset time, the defrosting mode is controlled to be closed;

[0199] Step S1110, if the water dripping time is less than the preset time, the absolute value of the temperature difference between the upper temperature of the evaporator collected by the second temperature sensor and the bottom temperature of the evaporator collected by the fourth temperature sensor is monitored;

[0200] Step S1120, whether the absolute value of the temperature difference is less than or equal to the preset temperature difference is judged, if the absolute value of the temperature difference is less than or equal to the preset temperature difference, step S1100 is executed, and if the absolute value of the temperature difference is greater than the preset temperature difference, step S1110 is returned.

[0201] In the embodiments of the present application, whether the defrosting condition is met can be determined based on the evaporator temperature, the freezing chamber temperature, etc., and if the defrosting condition is met, the defrosting mode is started. After the defrosting mode is started, the first PTC heater arranged at the upper part of the evaporator is controlled to start and heat at a high temperature gear to preferentially melt the ice and 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 ice and frost at the lower part of the evaporator to melt a part of the ice and frost at the lower part of the evaporator in advance. During the heating process of the first PTC heater, the temperature at the upper part of the evaporator gradually increases, and if the temperature at the upper part of the evaporator is less than a first temperature threshold, it indicates that the frost at the upper part of the evaporator has not been basically melted, and therefore the first PTC heater needs to be controlled to continue heating at the high temperature gear to continue melting the frost on the evaporator. When it is monitored that the temperature at the upper part of the evaporator is greater than or equal to the first temperature threshold, it can be indicated to some extent that the ice and frost at the upper part of the evaporator has been melted by more than half, but the ice and frost at the lower part of the evaporator has not been basically melted. At this time, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater arranged at the bottom of the evaporator is controlled to start and heat at a high temperature gear to melt the ice and frost at the upper and lower parts of the evaporator. At this time, since the second PTC heater starts to heat at the high temperature gear, the ice and frost at the upper part of the evaporator can also be melted to some extent while melting the ice and frost at the lower part of the evaporator, and therefore adjusting the first PTC heater to switch to heat at the low temperature gear can reduce power consumption, prevent the upper part of the evaporator from overheating due to continuous high-temperature heating, and reduce the influence of hot air flow on the temperature in the freezing compartment. During this process, the temperature of the evaporator continues to increase, and if the temperature at the bottom of the evaporator is less than a second temperature threshold, it indicates that the frost on the evaporator needs to be further melted, and therefore the first PTC heater needs to be controlled to heat at the low temperature gear and the second PTC heater needs to be controlled to heat at the high temperature gear to continue melting the frost on the evaporator. When it is monitored that the temperature at the bottom of the evaporator is greater than or equal to the second temperature threshold, it indicates that the frost at the lower part of the evaporator has also been melted by more than half, and at this time, the second PTC heater is controlled to switch to continue heating at the low temperature gear, which can reduce power consumption, prevent the lower part of the evaporator from overheating due to continuous high-temperature heating, and reduce the influence of hot air flow on the temperature in the freezing compartment. When it is monitored that the temperature at the bottom of the evaporator is greater than or equal to a third temperature threshold, it indicates that the ice and frost on the evaporator have been basically melted, and at this time, the first PTC heater and the second PTC heater are controlled to be turned off, and the residual heat in the heating element and the evaporator chamber is used to completely melt the remaining ice and frost on the evaporator. The first PTC heater and the second PTC heater are turned off in advance when the ice and frost on the evaporator have not been completely melted, which can reduce the influence of defrosting hot air flow on the temperature in the freezing compartment. After the first PTC heater and the second PTC heater are controlled to be turned off, the residual heat in the heating element and the evaporator chamber can be used to melt the remaining ice and frost on the evaporator.At this time, the dripping water condition under the evaporator can be monitored by the infrared sensor, and the dripping water time is accumulated immediately. Whether the dripping water time is greater than or equal to the preset time can be monitored, so that whether the ice and frost is melted can be effectively determined. Specifically, when the dripping water time is greater than or equal to the preset time, it can be determined that the ice and frost of the evaporator is melted. At this time, the defrosting mode can be controlled to be closed to end the defrosting. After the second PTC heater is controlled to be closed, whether the absolute value of the temperature difference between the upper part of the evaporator and the bottom of the evaporator is less than or equal to the preset temperature difference can be monitored, so that whether the ice and frost is melted can be effectively determined. Specifically, when the absolute value of the temperature difference between the upper part of the evaporator and the bottom of the evaporator is less than or equal to the preset temperature difference, it can be determined that the ice and frost of the evaporator is melted. At this time, the defrosting mode can be controlled to be closed to end the defrosting.

[0202] The embodiment of the present application also provides a refrigeration device, comprising:

[0203] A cabinet, which is a support structure of the refrigeration device, has a plurality of compartments inside;

[0204] A refrigeration system, which is arranged in the cabinet, comprises an evaporator;

[0205] A heating member, which comprises a plurality of PTC heaters, each of which is arranged at a different position of the evaporator, and each of the PTC heaters is powered to generate heat to melt the ice and frost condensed on the evaporator;

[0206] A temperature detection device, which comprises at least one temperature sensor, each of which is arranged at a different position of the evaporator, and each of the temperature sensors is used to collect the temperature at the different position of the evaporator;

[0207] An infrared sensor, which is arranged below the evaporator and is used to detect whether there is dripping water below the evaporator;

[0208] A controller, which is electrically connected with the heating member, the temperature detection device and the infrared sensor, and is used to execute the defrosting control method of any one of the embodiments of the present application.

[0209] The embodiment of the present application provides a refrigeration device. Since the controller of the refrigeration device can execute the defrosting control method described in any one of the embodiments of the present application, one or more PTC heaters can be controlled to be heated at different temperatures, or each of the PTC heaters can be controlled to switch different heating gears at different temperatures, so that the defrosting time can be effectively shortened, the defrosting efficiency can be improved, the power consumption can be reduced, the temperature fluctuation amplitude in the refrigerator during defrosting can be reduced, and the food storage quality can be improved.

[0210] The embodiments described in the embodiments of the present application are used to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0211] Those skilled in the art can understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and can include more or fewer steps than those shown in the figures, or combine certain steps, or different steps.

[0212] Those skilled in the art can understand that all or some of the steps in the above disclosed method, the functions of the modules / units in the system, and the device can be implemented as software, firmware, hardware and their appropriate combinations.

[0213] The terms "first", "second", "third", "fourth" and the like used in the specification of the present application and the above-described drawings (if any) are used to distinguish similar objects, and do not necessarily have to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, 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 "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0214] It should be understood that in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association between the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases: 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 represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple 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, and c can be single or multiple.

[0215] The preferred embodiments of the present application are described above with reference to the accompanying drawings, and are not intended to limit the scope of the present application. Any modification, equivalent replacement and improvement made by those skilled in the art without departing from the scope and spirit of the present application shall fall within the scope of the present application.

Claims

1. A defrosting control method of a refrigerating apparatus, characterized by, The refrigeration device comprises: a cabinet serving as a support structure of the refrigeration device, which is internally provided with a plurality of compartments; a refrigeration system provided in the cabinet, the refrigeration system comprising an evaporator; a heating element comprising a plurality of PTC heaters, each of the PTC heaters being arranged at a different position of the evaporator, and each of the PTC heaters being powered to generate heat to melt frost condensed on the evaporator; a temperature detection device comprising at least one temperature sensor, each of the temperature sensors being arranged at a different position of the evaporator, and each of the temperature sensors being configured to collect the temperature at the different position of the evaporator; an infrared sensor arranged below the evaporator and configured to detect whether water drops exist below the evaporator; the defrosting control method comprises: after starting the defrosting mode, controlling one or more PTC heaters of the heating element to generate heat at different temperatures, or controlling each of the PTC heaters to switch to different heating gears at different temperatures, according to the temperatures at different positions of the evaporator collected by each of the temperature sensors; after the heating ends, monitoring the water drop state below the evaporator by the infrared sensor, and accumulating the water drop time, so as to control the defrosting mode to be turned off when the water drop time is greater than or equal to a preset time; the heating element comprises a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device comprises a first temperature sensor arranged on the evaporator and configured to collect the temperature of the evaporator; correspondingly, after starting the defrosting mode, controlling one or more PTC heaters of the heating element to generate heat at different temperatures, according to the temperatures at different positions of the evaporator collected by each of the temperature sensors, comprises: controlling the first PTC heater to start heating after starting the defrosting mode; monitoring whether the temperature of the evaporator collected by the first temperature sensor is greater than or equal to a first preset temperature; controlling the second PTC heater to start heating when it is monitored that the temperature of the evaporator is greater than or equal to the first preset temperature; monitoring whether the temperature of the evaporator is greater than or equal to a second preset temperature, wherein the second preset temperature is greater than the first preset temperature; controlling the first PTC heater and the second PTC heater to be turned off when it is monitored that the temperature of the evaporator is greater than or equal to the second preset temperature.

2. The method of claim 1, wherein, the heating element comprises a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device comprises a first temperature sensor arranged on the evaporator and configured to collect the temperature of the evaporator; Correspondingly, after starting the defrosting mode, the PTC heaters are controlled to switch different heating gears to heat at different temperatures according to the temperatures of different positions of the evaporator collected by the temperature sensors. After starting the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear; whether the evaporator temperature collected by the first temperature sensor is greater than or equal to a first preset temperature is monitored; when it is monitored that the evaporator temperature is greater than or equal to the first preset temperature, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater is controlled to start and heat at a high temperature gear; whether the evaporator temperature is greater than or equal to a second preset temperature is monitored, wherein the second preset temperature is greater than the first preset temperature; when it is monitored that the evaporator temperature is greater than or equal to the second preset temperature, the first PTC heater and the second PTC heater are controlled to be turned off.

3. The method of claim 1, wherein, The heating member includes a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device includes a second temperature sensor and a third temperature sensor, the second temperature sensor is arranged at the upper part of the evaporator and is used to collect the upper part temperature of the evaporator, and the third temperature sensor is arranged at the middle of the evaporator and is used to collect the middle temperature of the evaporator; Correspondingly, after starting the defrosting mode, the PTC heaters are controlled to switch different heating gears to heat at different temperatures according to the temperatures of different positions of the evaporator collected by the temperature sensors. After starting the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear; whether the evaporator temperature collected by the first temperature sensor is greater than or equal to a first preset temperature is monitored; when it is monitored that the evaporator temperature is greater than or equal to the first preset temperature, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater is controlled to start and heat at a high temperature gear; whether the evaporator temperature is greater than or equal to a second preset temperature is monitored, wherein the second preset temperature is greater than the first preset temperature; when it is monitored that the evaporator temperature is greater than or equal to the second preset temperature, the first PTC heater and the second PTC heater are controlled to be turned off.

4. The method of claim 1, wherein, The heating member includes a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device includes a second temperature sensor and a third temperature sensor, the second temperature sensor is arranged at the upper part of the evaporator and is used to collect the upper part temperature of the evaporator, and the third temperature sensor is arranged at the middle of the evaporator and is used to collect the middle temperature of the evaporator; Correspondingly, after starting the defrosting mode, the temperatures of different positions of the evaporator collected by each temperature sensor are used to control each PTC heater to switch to different heating gears at different temperatures for heating. After starting the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear; whether the upper temperature of the evaporator collected by the second temperature sensor is greater than or equal to a first set temperature is monitored; when it is monitored that the upper temperature of the evaporator is greater than or equal to the first set temperature, the first PTC heater is controlled to switch to heat at a low temperature gear, and the second PTC heater is controlled to start and heat at a high temperature gear; whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to a second set temperature is monitored; when it is monitored that the middle temperature of the evaporator is greater than or equal to the second set temperature, the second PTC heater is controlled to switch to heat at a low temperature gear; whether the middle temperature of the evaporator collected by the third temperature sensor is greater than or equal to a third set temperature is monitored; when it is monitored that the middle temperature of the evaporator is greater than or equal to the third set temperature, the first PTC heater is controlled to be turned off; whether the upper temperature of the evaporator collected by the second temperature sensor is greater than or equal to a fourth set temperature is monitored; when it is monitored that the upper temperature of the evaporator is greater than or equal to the fourth set temperature, the second PTC heater is controlled to be turned off.

5. The method according to claim 3 or 4, characterized in that, The temperature detection device further comprises a fourth temperature sensor arranged at the bottom of the evaporator for collecting the bottom temperature of the evaporator; after the second PTC heater is controlled to be turned off, the method further comprises: monitoring the absolute value of the temperature difference between the upper temperature of the evaporator collected by the second temperature sensor and the bottom temperature of the evaporator collected by the fourth temperature sensor; when it is monitored that the absolute value of the temperature difference between the upper temperature and the bottom temperature of the evaporator is less than or equal to a preset temperature difference, the defrosting mode is controlled to be turned off.

6. The method of claim 1, wherein, The heating member comprises a first PTC heater and a second PTC heater, the first PTC heater is arranged at the upper part of the evaporator, and the second PTC heater is arranged at the bottom of the evaporator; the temperature detection device comprises a second temperature sensor and a fourth temperature sensor, the second temperature sensor is arranged at the upper part of the evaporator for collecting the upper temperature of the evaporator, and the fourth temperature sensor is arranged at the lower part of the evaporator for collecting the lower temperature of the evaporator; Correspondingly, after starting the defrosting mode, the temperatures of different positions of the evaporator collected by each temperature sensor are used to control each PTC heater to switch to different heating gears at different temperatures for heating. After starting the defrosting mode, the first PTC heater is controlled to start and heat at a high temperature gear; whether the upper temperature of the evaporator collected by the second temperature sensor is greater than or equal to a first temperature threshold is monitored; When the upper temperature of the evaporator is monitored to be greater than or equal to the first temperature threshold, the first PTC heater is controlled to switch to heating at a low temperature gear, and the second PTC heater is controlled to start and heat at a high temperature gear; whether the bottom temperature of the evaporator collected by the fourth temperature sensor is greater than or equal to a second temperature threshold is monitored; When the bottom temperature of the evaporator is monitored to be greater than or equal to the second temperature threshold, the second PTC heater is controlled to switch to heating at a low temperature gear; whether the bottom temperature of the evaporator collected by the fourth temperature sensor is greater than or equal to a third temperature threshold is monitored; When the bottom temperature of the evaporator is monitored to be greater than or equal to the third temperature threshold, the first PTC heater and the second PTC heater are controlled to be turned off.

7. The method of claim 1, wherein, After the heating is completed, the dripping state of water under the evaporator is monitored by the infrared sensor, and the dripping time is accumulated, so that the defrosting mode is controlled to be turned off when the dripping time is greater than or equal to a preset time, comprising: After the first PTC heater and the second PTC heater are both controlled to be turned off, the dripping state of water under the evaporator is monitored by the infrared sensor, and the dripping time is started to be accumulated; When the dripping time is monitored to be greater than or equal to the preset time, the defrosting mode is controlled to be turned off.

8. A refrigeration apparatus characterized by comprising: comprising: a cabinet serving as a support structure of a refrigeration device, and having a plurality of compartments inside; a refrigeration system provided in the cabinet, the refrigeration system comprising an evaporator; a heating member comprising a plurality of PTC heaters, each of the PTC heaters being arranged at a different position of the evaporator, and each of the PTC heaters being powered to generate heat to melt ice and frost condensed on the evaporator; a temperature detection device comprising at least one temperature sensor, each of the temperature sensors being arranged at a different position of the evaporator, and each of the temperature sensors being used to collect the temperature at the different position of the evaporator; an infrared sensor arranged below the evaporator and used to detect whether there is dripping water below the evaporator; a controller electrically connected with the heating member, the temperature detection device and the infrared sensor, and used to execute the defrosting control method according to any one of claims 1-7.

9. The refrigeration appliance of claim 8, wherein, The heating member comprises a first PTC heater and a second PTC heater, the first PTC heater is arranged at an upper portion of the evaporator, the second PTC heater is arranged at a bottom portion of the evaporator, the temperature detection device comprises a first temperature sensor, the first temperature sensor is arranged at the evaporator and used to collect the temperature of the evaporator, and the first PTC heater, the second PTC heater and the first temperature sensor are electrically connected with the controller.

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