A defrosting heater for a refrigerator evaporator, a refrigerator and a defrosting control method

Abstract

The application provides a defrosting heater for a refrigerator evaporator, a refrigerator and a defrosting control method, which comprises an evaporator, a defrosting heater assembly, a first defrosting sensor, a second defrosting sensor and a controller; the defrosting heater assembly is composed of a first heating pipe, a second heating pipe and a third heating pipe; the first heating pipe is arranged at the upper end of the evaporator and is embedded in the body of the evaporator; the second heating pipe is arranged at the lower end of the evaporator, the upper part of the second heating pipe is close to the bottom of the evaporator, the lower part of the second heating pipe is close to a drain port, and a heat-conducting wire is arranged at the lowest part of the second heating pipe; the first defrosting sensor is arranged in the body of the evaporator at the upper part of the first heating pipe; and the second defrosting sensor is arranged in the body of the evaporator between the first heating pipe and the second heating pipe. The application realizes synchronous defrosting at the upper end and the lower end of the fin evaporator in the defrosting process through the design of the segmented heater, improves the defrosting efficiency and shortens the defrosting time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a defrosting heater for a refrigerator evaporator, a refrigerator and a defrosting control method. BACKGROUND

[0002] With the development of technology and the improvement of people's living standards, the refrigerator has become a necessity for every family. At present, the refrigerator is mostly air-cooled refrigerator. The air-cooled refrigerator is a refrigerator that uses a fan to circulate air to achieve cooling. In the air-cooled refrigerator, the cooler reduces the temperature inside the refrigerator by blowing cold air by the fan. This cold air is evenly distributed to each part of the refrigerator, thereby achieving overall refrigeration.

[0003] The air-cooled refrigerator has the advantages of fast cooling speed and automatic defrosting, gradually replacing the direct-cooled refrigerator. However, the evaporator of the air-cooled refrigerator needs to be defrosted periodically to ensure the heat exchange performance of the evaporator. To achieve reliable defrosting of the evaporator, a heater is usually arranged at the bottom of the finned evaporator to heat and defrost the evaporator by the combined heat transfer mode of heat radiation, heat conduction and natural convection of the heater. The defrosting heater is usually arranged between the evaporator and the water pan in the air-cooled refrigerator, and its arrangement form greatly affects the defrosting performance.

[0004] There are mainly two forms of arrangement structure of the conventional defrosting heater in the refrigerator. The first arrangement structure is that the defrosting heater is located between the evaporator and the water pan, and the pipeline thereof is parallel to the bottom of the evaporator. The second arrangement structure is that the pipeline of the defrosting heater is inclined from the bottom of the evaporator to the drainage opening of the water pan. In the actual defrosting process, based on the combined heat transfer characteristics, the frost layer on the surface of the evaporator presents a step-by-step defrosting mode from bottom to top. The higher the evaporator, the longer the relative defrosting time, and the lower the evaporator defrosting efficiency, resulting in high energy consumption of the refrigerator, high temperature rise of the compartment, poor preservation effect and other problems. SUMMARY

[0005] The present application provides a defrosting heater for a refrigerator evaporator, a refrigerator and a defrosting control method to solve the problem that the longer the defrosting time of the current refrigerator, the lower the evaporator defrosting efficiency, resulting in high energy consumption of the refrigerator, high temperature rise of the compartment and poor preservation effect.

[0006] In a first aspect, the present application provides a defrosting heater for a refrigerator evaporator, which comprises:

[0007] an evaporator, a defrosting heater assembly, a first defrosting sensor, a second defrosting sensor and a controller; the controller is configured to execute a preset refrigerator defrosting control method;

[0008] The defrosting heater assembly is composed of a first heating pipe, a second heating pipe and a third heating pipe; the first heating pipe is arranged at the upper end of the evaporator, the first heating pipe is embedded in the body of the evaporator, the second heating pipe is arranged at the lower end of the evaporator, the upper part of the second heating pipe is close to the bottom of the evaporator, the lower part of the second heating pipe is close to the drain port, and a heat-conducting wire is arranged at the lowest part of the second heating pipe;

[0009] The first defrosting sensor is arranged in the body of the evaporator at the upper part of the first heating pipe, and is used for detecting the surface temperature of the upper part of the evaporator.

[0010] The second defrosting sensor is arranged in the body of the evaporator between the first heating pipe and the second heating pipe, and is used for detecting the surface temperature of the evaporator between the first heating pipe and the second heating pipe.

[0011] In some possible implementation manners, the third heating pipe is connected with the first heating pipe and the second heating pipe, and the third heating pipe is arranged to have a length proportional to the height of the evaporator.

[0012] In some possible implementation manners, the first heating pipe is arranged vertically along the height direction and horizontally along the pipeline of the evaporator, and the first heating pipe is embedded in the body of the evaporator along the depth direction.

[0013] In some possible implementation manners, the first heating pipe is arranged horizontally along the height direction and horizontally along the pipeline of the evaporator, and the first heating pipe is embedded in the body of the evaporator along the depth direction.

[0014] In some possible implementation manners, the first heating pipe, the second heating pipe and the third heating pipe are of an integral structure; the third heating pipe is a heating element or a non-heating element.

[0015] In some possible implementation manners, the first heating pipe and the second heating pipe are of a segmented structure, that is, two-segmented heaters independent of each other.

[0016] In a second aspect, the application further provides a refrigerator, which comprises the defrosting heater for the evaporator of the refrigerator according to the first aspect.

[0017] In a third aspect, the application further provides a defrosting control method, which comprises:

[0018] The surface temperature TC1 of the first defrosting sensor is detected in real time, and if the TC1 is greater than or equal to a first preset temperature T1, the first heating pipe is in a disconnected mode; otherwise, the first heating pipe is in a connected mode.

[0019] Real-time detection of the second defrost sensor surface temperature TC2, if TC2 is greater than or equal to the second preset temperature T2, and the first heating pipe is in the on mode, the second heating pipe is in the off mode; otherwise, the second heating pipe remains in the on mode.

[0020] When the first heating pipe remains in the off mode, real-time detection of the first defrost sensor surface temperature TC1, if TC1 is less than or equal to the third preset temperature T3, the first heating pipe is in the on mode; otherwise, the first heating pipe remains in the off mode.

[0021] When the first heating pipe is in the off mode, if the second heating pipe is not in the off mode, the second heating pipe is adjusted to the on mode.

[0022] When the second heating pipe is in the off mode, real-time detection of the second defrost sensor surface temperature TC2, if TC2 is less than or equal to the fourth preset temperature T4, the second heating pipe is in the on mode; otherwise, the second heating pipe remains in the off mode.

[0023] Real-time detection of the first defrost sensor surface temperature TC1 and the second defrost sensor surface temperature TC2, if TC1 is greater than or equal to the fifth preset temperature T5, and TC2 is greater than or equal to T5, the first heating pipe and the second heating pipe are in the off mode, the defrosting mode is ended, and the water throwing mode is executed; wherein the fifth preset temperature T5 is greater than the first preset temperature T1.

[0024] In some possible implementation manners, the method further includes:

[0025] If any of the first defrost sensor and the second defrost sensor fails, a failure mode is entered, that is, the first heating pipe is in the off mode, and the second heating pipe is in the on mode, after running for t1 minutes, the second heating pipe is in the off mode, the defrosting is completed, and the water throwing mode is entered.

[0026] If the first defrost sensor and the second defrost sensor are normal, the defrosting mode runs for t2 minutes, the first defrost sensor surface temperature TC1 and the second defrost sensor surface temperature TC2 are not detected, the defrosting is completed, and the water throwing mode is entered.

[0027] In some possible implementation manners, the method further includes:

[0028] When the water throwing mode is executed, the first heating pipe and the second heating pipe are both in the off mode, and the refrigeration circulating fan is started to run for t3 seconds and then is turned off, and the dripping water mode is entered.

[0029] When the dripping water mode is executed, the first heating pipe and the second heating pipe are both in the off mode, and the refrigeration circulating fan is in the off mode and is maintained for t4 minutes.

[0030] After t4 minutes, the water dripping mode ends, the compressor starts, and the normal refrigeration mode is entered.

[0031] From the above, the defrosting heater for the evaporator of the refrigerator, the refrigerator and the defrosting control method provided by the present application are known, which comprises an evaporator, a defrosting heater assembly, a first defrosting sensor, a second defrosting sensor and a controller; the defrosting heater assembly is composed of a first heating pipe, a second heating pipe and a third heating pipe; the first heating pipe is arranged at the upper end of the evaporator, the first heating pipe is embedded in the body of the evaporator, the second heating pipe is arranged at the lower end of the evaporator, the upper part of the second heating pipe is close to the bottom of the evaporator, the lower part of the second heating pipe is close to the drain port, and a heat-conducting wire is arranged at the lowest part of the second heating pipe; the first defrosting sensor is arranged in the body of the evaporator at the upper part of the first heating pipe, and is used for detecting the surface temperature of the upper part of the evaporator; the second defrosting sensor is arranged in the body of the evaporator between the first heating pipe and the second heating pipe, and is used for detecting the surface temperature of the evaporator between the first heating pipe and the second heating pipe. The present application is designed by a segmented heater, synchronous defrosting is realized at the upper end and the lower end of the finned evaporator during the defrosting process, the defrosting efficiency is improved, the defrosting time is shortened, the uniformity of the surface temperature of the finned evaporator is improved by the temperature control of the double defrosting sensors, the energy utilization rate of defrosting is improved, and the defrosting reliability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without any creative effort on the premise of not paying any creative effort.

[0033] Figure 1 The front view of the evaporator and the defrosting heater assembly in the embodiment of the present application;

[0034] Figure 2 The structure of the defrosting heating assembly in the embodiment of the present application Figure 1 ;

[0035] Figure 3 The side view of the evaporator and the defrosting heater assembly in the embodiment of the present application;

[0036] Figure 4 The structure of the defrosting heating assembly in the embodiment of the present application Figure 2 .

[0037] Illustration:

[0038] 1-evaporator; 2-defrosting heating assembly; 101-first defrosting sensor; 102-second defrosting sensor; 201-first heating pipe; 202-second heating pipe; 203-third heating pipe; 204-heat-conducting wire. DETAILED DESCRIPTION

[0039] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0040] With the development of technology and the improvement of people's living standards, refrigerators have become a necessity in every household. Currently, most refrigerators are air-cooled, which uses fans to circulate air for cooling. In air-cooled refrigerators, the cooler lowers the temperature inside the refrigerator by blowing cold air from the fan. This cool air is evenly distributed throughout the refrigerator, achieving overall cooling.

[0041] Air-cooled refrigerators, with their advantages of rapid cooling and automatic defrosting, are gradually replacing direct-cooled refrigerators. However, the evaporator in air-cooled refrigerators requires periodic defrosting to maintain heat transfer performance. To ensure reliable evaporator defrosting, a heater is typically installed at the base of the finned evaporator. This heater defrosts the evaporator through a combination of heat transfer through radiation, conduction, and natural convection. The defrost heater is typically located between the evaporator and the drain pan in air-cooled refrigerators, and its placement significantly influences defrost performance.

[0042] Traditionally, there are two main configurations for defrost heaters in refrigerators. In the first configuration, the defrost heater is located between the evaporator and the drain pan, with its piping parallel to the bottom of the evaporator. In the second configuration, the defrost heater piping slopes from the bottom of the evaporator toward the drain outlet of the drain pan. During the actual defrosting process, due to the combined heat transfer characteristics, the frost on the evaporator surface gradually melts from the bottom up. The higher the evaporator, the longer the defrost time and the lower the evaporator's defrost efficiency. This results in higher energy consumption, higher compartment temperatures, and poorer freshness preservation.

[0043] Based on this, the present application provides a defrost heater, refrigerator and defrost control method for a refrigerator evaporator. Through the segmented heater design, synchronous defrosting is achieved at the upper and lower ends of the fin evaporator during the defrost process, thereby improving defrost efficiency and shortening defrost time; through the temperature control of dual defrost sensors, the surface temperature uniformity of the fin evaporator is improved, the defrost energy utilization rate is improved, and the defrost reliability is improved.

[0044] In some embodiments, a defrost control method is provided. The defrost control method is applied to a refrigerator, and the control method includes:

[0045] S1: When the refrigerator meets the defrosting condition, the compressor is controlled to stop, the refrigeration mode is ended, and the defrosting mode is executed; the first heating pipe and the second heating pipe are synchronized to the on mode, and the defrosting starts;

[0046] S2: The surface temperature TC1 of the first defrosting sensor is detected in real time, if TC1≥the first preset temperature T1, the first heating pipe executes the off mode, otherwise the first heating pipe maintains the on mode;

[0047] S3: The surface temperature TC2 of the second defrosting sensor is detected in real time, if TC2≥the second preset temperature T2, and the first heating pipe is in the on mode, the second heating pipe executes the off mode, otherwise the second heating pipe maintains the on mode;

[0048] S4: If the first heating pipe is in the off mode under the condition of S2, the surface temperature TC1 of the first defrosting sensor is detected in real time, if TC1≤the third preset temperature T3, the first heating pipe executes the on mode, otherwise the first heating pipe maintains the off mode;

[0049] S5: When the first heating pipe is in the off mode under the condition of S2, and the second heating pipe is in the on mode, the second heating pipe maintains the on mode, if the second heating pipe is in the off mode, the second heating pipe executes the on mode;

[0050] S6: If the second heating pipe is in the off mode under the condition of S3, the surface temperature TC2 of the second defrosting sensor is detected in real time, if TC2≤the fourth preset temperature T4, the second heating pipe executes the on mode, otherwise the second heating pipe maintains the off mode;

[0051] S7: The surface temperatures TC1 and TC2 of the first and second defrosting sensors are detected in real time, if TC1≥the fifth preset temperature T5, and TC2≥T5, the first and second heating pipes execute the off mode, the defrosting mode is ended, and the water throwing mode is executed; wherein the fifth preset temperature T5>the first preset temperature T1.

[0052] In some embodiments, the method further comprises:

[0053] If any of the first and second defrosting sensors fails, a fault mode is entered, that is, the first heating pipe is in the off mode, the second heating pipe is in the on mode, after running for t1 minutes, the second heating pipe executes the off mode, the defrosting is completed, and the water throwing mode is entered;

[0054] If the first and second defrosting sensors are normal, the running time of the defrosting mode meets t2 minutes, the surface temperatures TC1 and TC2 of the first and second defrosting sensors are not detected, the defrosting is completed, and the water throwing mode is entered.

[0055] In some embodiments, the method further comprises:

[0056] When the water throwing mode is executed, the first heating pipe and the second heating pipe are both in the off mode, the refrigeration circulating fan is started to run for t3 seconds and then is turned off, and the water dripping mode is entered;

[0057] When the water dripping mode is executed, the first heating pipe and the second heating pipe are both in the off mode, and the refrigeration circulating fan is in the off mode, and is maintained for t4 minutes;

[0058] After t4 minutes, the water dripping mode ends, the compressor is started, and the normal refrigeration mode is entered.

[0059] In some embodiments, as shown in Figure 1 The application also provides a defrosting heater for an evaporator of a refrigerator, which comprises:

[0060] an evaporator 1, a defrosting heater assembly 2, a first defrosting sensor 101, a second defrosting sensor 102, and a controller; wherein the controller in the embodiment is configured with the defrosting control method of the refrigerator in the above-mentioned embodiments;

[0061] The defrosting heater assembly 2 is composed of a first heating pipe 201, a second heating pipe 202, and a third heating pipe 203; the first heating pipe 201 is arranged at the upper end of the evaporator 1 and is embedded in the body of the evaporator 1, the second heating pipe 202 is arranged at the lower end of the evaporator 1, the upper part of the second heating pipe 202 is close to the bottom of the evaporator 1, the lower part of the second heating pipe 202 is close to the drain, and a heat-conducting wire 204 is arranged at the lowest part of the second heating pipe 202;

[0062] The first defrosting sensor 101 is arranged in the body of the evaporator 1 at the upper part of the first heating pipe 201 and is used for detecting the surface temperature of the upper part of the evaporator 1;

[0063] The second defrosting sensor 102 is arranged in the body of the evaporator 1 between the first heating pipe 201 and the second heating pipe 202 and is used for detecting the surface temperature of the evaporator 1 between the first heating pipe 201 and the second heating pipe 202.

[0064] In some embodiments, the third heating pipe 203 is connected to the first heating pipe 201 and the second heating pipe 202, and the length of the third heating pipe 203 is proportional to the height of the evaporator 1.

[0065] The heating power P1 of the first heating pipe 201, the heating power P2 of the second heating pipe 202, and the heating power P3 of the third heating pipe 203 are usually set as P2≥P1≥P3 and P3≥0Ω in order to realize the uniformity and rationality of defrosting of the defrosting heater assembly 2.

[0066] In some embodiments, the first heating pipe 201 is vertically arranged along the height direction and horizontally arranged along the pipeline of the evaporator 1, and is embedded in the evaporator 1 along the depth direction.

[0067] As shown in FIG. 1, Figure 2 , As shown in FIG. 1, Figure 3 the first heating pipe 201 is vertically arranged along the height direction and horizontally arranged along the pipeline of the evaporator 1, and is embedded in the evaporator 1 along the depth direction.

[0068] In some embodiments, the first heating pipe 201 is horizontally arranged along the height direction and horizontally arranged along the pipeline of the evaporator 1, and is embedded in the evaporator 1 along the depth direction.

[0069] As shown in FIG. 1, Figure 3 , As shown in FIG. 1, Figure 4 the first heating pipe 201 is horizontally arranged along the depth direction and horizontally arranged along the pipeline of the evaporator 1, and is embedded in the evaporator 1 along the depth direction.

[0070] In some embodiments, the first heating pipe 201, the second heating pipe 202 and the third heating pipe 203 are of an integral structure; the third heating pipe 203 is a heating element or a non-heating element.

[0071] The first heating pipe 201, the second heating pipe 202 and the third heating pipe 203 are of an integral structure, the third heating pipe 203 is set as a heating element to assist the evaporator 1 in defrosting, or is set as a non-heating element, i.e. P3=0W, only for connection function.

[0072] In some embodiments, the first heating pipe 201 and the second heating pipe 202 are of a segmented structure, i.e. two independent segments of the heater.

[0073] In some embodiments, the first heating pipe 201 and the second heating pipe 202 are electrically connected in series by the controller, i.e. realizing the function of simultaneous opening or simultaneous closing.

[0074] In some embodiments, the first heating pipe 201 and the second heating pipe 202 are electrically connected in parallel by the controller, avoiding any heater failure and ensuring normal work of the other heater, and ensuring the defrosting reliability.

[0075] In some embodiments, the first heating pipe 201 and the second heating pipe 202 are electrically connected independently by the controller, i.e. realizing the function of simultaneous opening or independent opening of any heater.

[0076] The application also provides a refrigerator comprising the defrosting heater for the evaporator of the refrigerator in the above embodiments.

[0077] The application realizes synchronous defrosting at the upper end and the lower end of the finned evaporator during the defrosting process through the sectional heater design, improves the defrosting efficiency, and shortens the defrosting time; the uniformity of the surface temperature of the finned evaporator is improved through the temperature control of the double defrosting sensors, the defrosting energy utilization rate is improved, and the defrosting reliability is improved.

[0078] Embodiments

[0079] It is judged whether the refrigerator meets the defrosting condition, if the defrosting condition is not met, the refrigerator continues to execute the normal refrigeration mode; if the defrosting condition is met, the compressor is stopped, the refrigeration is ended, and the defrosting mode is executed:

[0080] S1: the first heating pipe 201 and the second heating pipe 202 are in the synchronous on mode, and the defrosting starts;

[0081] S2: the surface temperature TC1 of the first defrosting sensor 101 is detected in real time, if TC1≥T1, the first heating pipe 201 executes the off mode, otherwise the first heating pipe 201 maintains the on mode, and T1≥-5℃ is set;

[0082] S3: the surface temperature TC2 of the second defrosting sensor 102 is detected in real time, if TC2≥T2 and the first heating pipe 201 is in the on mode, the second heating pipe 202 executes the off mode, otherwise the second heating pipe 202 maintains the on mode, and T2≥0℃ is set;

[0083] S4: if the first heating pipe 201 is in the off mode under the condition of S2, the surface temperature TC1 of the first defrosting sensor 101 is detected in real time, if TC1≤T3, the first heating pipe 201 executes the on mode, otherwise the first heating pipe 201 maintains the off mode, and T3≤T1-N1, N1>0;

[0084] S5: when the first heating pipe 201 is in the off mode under the condition of S2, if the second heating pipe 202 is in the on mode, the second heating pipe 202 maintains the on mode, if the second heating pipe 202 is in the off mode, the second heating pipe 202 executes the on mode;

[0085] S6: if the second heating pipe 202 is in the off mode under the condition of S3, the surface temperature TC2 of the second defrosting sensor 102 is detected in real time, if TC2≤T4, the second heating pipe 202 executes the on mode, otherwise the second heating pipe 202 maintains the off mode, and T4≤T2-N2, N2>0;

[0086] S7: Real-time detection of the surface temperature TC1 of the first defrosting sensor 101 and the surface temperature TC2 of the second defrosting sensor 102, if TC1≥T5 and TC2≥T5, the first heating pipe 201 and the second heating pipe 202 execute the off mode, the current defrosting is ended, and the water throwing mode is entered, and the T5>T1;

[0087] S8: If any of the first defrosting sensor 101 and the second defrosting sensor 102 fails, a fault mode is entered, that is, the first heating pipe 201 is in the off mode, and the second heating pipe 202 is in the on mode, and after running for t1 minutes, the second heating pipe 202 executes the off mode, the current defrosting is ended, and the water throwing mode is entered;

[0088] S9: If the first defrosting sensor 101 and the second defrosting sensor 102 are normal, the defrosting mode runs for t2 minutes, the surface temperature TC1 of the first defrosting sensor 101 and the surface temperature TC2 of the second defrosting sensor 102 are not detected, the current defrosting is ended, and the water throwing mode is entered;

[0089] S10: The water throwing mode is executed, the first heating pipe 201 and the second heating pipe 202 are both in the off mode, the refrigeration circulating fan is started to run for t3 seconds and then is turned off, and the dripping water mode is entered;

[0090] S11: The dripping water mode is executed, the first heating pipe 201 and the second heating pipe 202 are both in the off mode, and the refrigeration circulating fan is in the off mode, and is maintained for t4 minutes.

[0091] S12: The dripping water mode is defrosted, the compressor is started, and the normal refrigeration mode is entered.

[0092] From the above embodiments, the defrosting heater for the evaporator of the refrigerator, the refrigerator and the defrosting control method are provided, the defrosting heater comprises: an evaporator, a defrosting heater assembly, a first defrosting sensor, a second defrosting sensor and a controller; the defrosting heater assembly is composed of a first heating pipe, a second heating pipe and a third heating pipe; the first heating pipe is arranged at the upper end of the evaporator, the first heating pipe is embedded in the evaporator body, the second heating pipe is arranged at the lower end of the evaporator, the upper part of the second heating pipe is close to the bottom of the evaporator, the lower part of the second heating pipe is close to the drain port, and a heat-conducting wire is arranged at the lowest part of the second heating pipe; the first defrosting sensor is arranged in the evaporator body at the upper part of the first heating pipe, and is used for detecting the surface temperature of the upper part of the evaporator; the second defrosting sensor is arranged in the evaporator body between the first heating pipe and the second heating pipe, and is used for detecting the surface temperature of the evaporator between the first heating pipe and the second heating pipe. The application realizes synchronous defrosting at the upper end and the lower end of the fin evaporator in the defrosting process through the segmented heater design, improves the defrosting efficiency, shortens the defrosting time, improves the uniformity of the surface temperature of the fin evaporator through the double defrosting sensor temperature control, improves the defrosting energy utilization rate, and improves the defrosting reliability.

[0093] The similar parts among the embodiments provided by the application can be referred to each other, the specific embodiments provided above are only several examples under the general concept of the application, and do not constitute the limitation of the protection scope of the application. Any other embodiments extended according to the application scheme without creative labor belong to the protection scope of the application for those skilled in the art.

Claims

1. A defrosting heater for a refrigerator evaporator, characterized by, The defrosting heater comprises: The evaporator (1), the defrosting heater assembly (2), the first defrosting sensor (101), the second defrosting sensor (102) and the controller; the controller is configured to execute the preset defrosting control method; The defrosting heater assembly (2) is composed of the first heating pipe (201), the second heating pipe (202) and the third heating pipe (203); the first heating pipe (201) is arranged at the upper end of the evaporator (1), the first heating pipe (201) is embedded in the body of the evaporator (1), the second heating pipe (202) is arranged at the lower end of the evaporator (1), the upper part of the second heating pipe (202) is close to the bottom of the evaporator (1), the lower part of the second heating pipe (202) is close to the drain, and the heat conducting wire (204) is arranged at the lowest part of the second heating pipe (202); The first defrosting sensor (101) is arranged in the body of the evaporator (1) at the upper part of the first heating pipe (201) and is used for detecting the surface temperature of the upper part of the evaporator (1); The second defrosting sensor (102) is arranged in the body of the evaporator (1) between the first heating pipe (201) and the second heating pipe (202) and is used for detecting the surface temperature of the evaporator (1) between the first heating pipe (201) and the second heating pipe (202); The preset defrosting control method comprises: When the refrigerator meets the defrosting condition, the compressor is controlled to stop, the refrigeration mode is ended, and the defrosting mode is executed; the first heating pipe and the second heating pipe are simultaneously switched to the on mode, and the defrosting starts; The surface temperature TC1 of the first defrosting sensor is detected in real time, and when TC1 is greater than or equal to the first preset temperature T1, the first heating pipe is switched to the off mode; otherwise, the first heating pipe is maintained in the on mode; The surface temperature TC2 of the second defrosting sensor is detected in real time, and when TC2 is greater than or equal to the second preset temperature T2 and the first heating pipe is in the on mode, the second heating pipe is switched to the off mode; otherwise, the second heating pipe is maintained in the on mode; When the first heating pipe is in the off mode, the surface temperature TC1 of the first defrosting sensor is detected in real time, and when TC1 is less than or equal to the third preset temperature T3, the first heating pipe is switched to the on mode; otherwise, the first heating pipe is maintained in the off mode; When the first heating pipe is in the off mode and the second heating pipe is in the on mode, the second heating pipe is maintained in the on mode; if the second heating pipe is in the off mode, the second heating pipe is adjusted to the on mode; When the second heating pipe is in the off mode, the surface temperature TC2 of the second defrosting sensor is detected in real time, and when TC2 is less than or equal to the fourth preset temperature T4, the second heating pipe is switched to the on mode; otherwise, the second heating pipe is maintained in the off mode; The surface temperatures TC1 and TC2 of the first defrosting sensor and the second defrosting sensor are detected in real time, and when TC1 is greater than or equal to the fifth preset temperature T5 and TC2 is greater than or equal to T5, the first heating pipe and the second heating pipe are switched to the off mode, the defrosting mode is ended, and the water draining mode is executed; the fifth preset temperature T5 is greater than the first preset temperature T1.

2. The defrosting heater for a refrigerator evaporator according to claim 1, characterized by, The third heating pipe (203) is connected with the first heating pipe (201) and the second heating pipe (202), and the length of the third heating pipe (203) is proportional to the height of the evaporator (1).

3. The defrosting heater for a refrigerator evaporator according to claim 1, characterized by, The first heating pipe (201) is vertically arranged along the height direction and horizontally arranged along the pipeline of the evaporator (1), and is embedded in the body of the evaporator (1) along the depth direction.

4. The defrosting heater for a refrigerator evaporator according to claim 1, characterized by, The first heating pipe (201) is horizontally arranged along the height direction and horizontally arranged along the pipeline of the evaporator (1), and is embedded in the body of the evaporator (1) along the depth direction.

5. The defrosting heater for a refrigerator evaporator according to claim 1, wherein The first heating pipe (201), the second heating pipe (202) and the third heating pipe (203) are of an integral structure, and the third heating pipe (203) is a heating element or a non-heating element.

6. The defrosting heater for a refrigerator evaporator according to claim 1, wherein The first heating pipe (201) and the second heating pipe (202) are of a segmented structure, i.e., two independent sections of the heater.

7. The defrosting heater for the evaporator of the refrigerator according to claim 1, wherein the controller is further configured to: If any of the first defrosting sensor and the second defrosting sensor is faulty, a fault mode is entered, i.e., the first heating pipe is in an off mode, the second heating pipe is in an on mode, and after running for t1 minutes, the second heating pipe is in an off mode, the current defrosting is ended, and a water draining mode is entered; If the first defrosting sensor and the second defrosting sensor are normal, the defrosting mode running time satisfies t2 minutes, and the surface temperature TC1 of the first defrosting sensor and the surface temperature TC2 of the second defrosting sensor are not detected, the current defrosting is ended, and the water draining mode is entered.

8. The defrosting heater for the evaporator of the refrigerator according to claim 1, wherein the controller is further configured to: When the water draining mode is executed, the first heating pipe and the second heating pipe are both in an off mode, the refrigeration circulating fan is started to run for t3 seconds and then is turned off, and a water dripping mode is entered; When the water dripping mode is executed, the first heating pipe and the second heating pipe are both in an off mode, and the refrigeration circulating fan is in a closed mode and is maintained for t4 minutes; After t4 minutes, the water dripping mode is ended, the compressor is started, and a normal refrigeration mode is entered.

9. A refrigerator characterized by comprising: The refrigerator comprises the defrosting heater for the evaporator of the refrigerator according to any one of claims 1-8.

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