Refrigerator defrosting control method and refrigerator
By detecting the temperature drop rate of the refrigerator room and intelligently adjusting the defrost exit conditions, the existing refrigerator defrost methods have solved the problem of incomplete or excessive defrost defrost, and the stability of the refrigerator's working state and the energy-saving effect of the defrost process are achieved.
Patent Information
- Application Number
- CN202510058006.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-03-28
AI Technical Summary
The existing refrigerator defrosting methods have problems such as incomplete defrosting or excessive defrosting, and the frosting cannot be reflected in time, resulting in unstable working state of the refrigerator.
By detecting the temperature drop rate V of the refrigerator chamber during each refrigeration cycle, if V is less than the set standard temperature drop rate Vx, turn on the heater to defrost; determine the defrost exit conditions based on the defrost interval tn, the set standard defrost interval tx and the evaporator temperature Tn-1 of the last defrost exit, and realize intelligent adjustment of defrost exit.
It effectively solves the problem of excessive defrost or insufficient defrost in traditional defrost methods, ensures that the evaporator is in the best working state, reduces the impact of the defrost process on the internal temperature of the room, and makes the working state of the refrigerator more stable.
Smart Images
Figure CN119713740A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of refrigerators, and more specifically, relates to a refrigerator defrosting control method and a refrigerator. Background Art
[0002] During the use of the refrigerator, due to the influence of many factors such as the opening and closing of the door, the presence of high-water-content food inside the refrigerator, and the heat and moisture transfer at the door seal, water vapor will gradually condense into a frost layer and cover the surface of the evaporator. A thick frost layer will hinder the heat exchange between the cold surface of the evaporator and the indoor air in the refrigerator, so the evaporator needs to be defrosted.
[0003] The commonly used method for judging whether to enter defrost is to rely on the temperature sensors at the inlet and outlet of the evaporator to judge whether to defrost. The commonly used method for judging whether to exit defrost is to use the internal pressure of the refrigerator's evaporator pipe as the basis for judgment, analyze the frost layer state and temperature, and then control whether to exit defrost. The principle is that during the defrost process, the refrigerant pressure in the refrigerant pipe changes with the change of the frost layer state and temperature. However, in actual applications, there is a lag in the temperature change of the pipe, and the temperature combined with the pressure detection and analysis method cannot reflect the degree of defrost in time. At the same time, during the defrost process, the frost layer outside the pipe undergoes a phase change. At this time, the temperature remains unchanged, and the pressure inside the pipe remains unchanged. At this stage, it is impossible to make an effective and reasonable defrost choice based solely on the judgment of the pressure value and temperature value, which will not only greatly affect the normal working state of the refrigerator, but also there will always be the phenomenon of insufficient or excessive defrost. Summary of the invention
[0004] The object of the present invention is to provide a refrigerator defrosting control method and a refrigerator, so as to solve the problem of incomplete defrosting or excessive defrosting in the existing refrigerator defrosting method.
[0005] To achieve the above object, the technical solution adopted by the present invention is: The present invention first provides a refrigerator defrosting control method, comprising: Obtain the temperature drop rate V of the refrigerator compartment in each refrigeration cycle and set the standard temperature drop rate V x ; If V≤V 标 , then turn on the heater to defrost the evaporator; After entering this defrost, according to the defrost interval t of this defrost n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 Determine the exit condition of this defrost.
[0006] Furthermore, the defrosting interval t according to this defrosting n , set the standard frost interval t xThe evaporator temperature T when the last defrost exited n-1 Determine the defrost exit conditions include: If n ≥t x , then when the defrost is executed, the real-time evaporator temperature T a ≥First set evaporator temperature T c When the defrost is stopped, the current defrost will be terminated. If n <t 标 And T n-1 ≥T c +ΔT, then the real-time evaporator temperature T when this defrost is executed a ≥The second set evaporator temperature T z When the defrost is stopped, the current defrost will be terminated. If n <t 标 And T n-1 <T c +ΔT, then the real-time evaporator temperature T during this defrost execution a ≥First set evaporator temperature T c After that, when the heater continues heating time to reach the set extension time of this defrost, the defrost is exited.
[0007] Furthermore, while the heater continues to heat, if T a ≥T c +ΔT, the defrost will be terminated in advance.
[0008] Furthermore, before obtaining the temperature drop rate V of the refrigerator compartment in each refrigeration cycle, the method further includes: After the refrigerator is powered on for the first time, if the conditions for entering the first defrost are met, the heater is turned on to defrost the evaporator; After entering the first defrost, if the first defrost exit conditions are met, the first defrost will be exited.
[0009] Furthermore, the first defrost entry condition is that the running time H0 after the refrigerator is powered on for the first time reaches the set waiting time Q for the first defrost.
[0010] Furthermore, the first defrost exit condition is the real-time evaporator temperature T when the first defrost is executed. a ≥The second set evaporator temperature T z .
[0011] Furthermore, it also includes: Obtain the operating time H1 of the refrigerator after the first defrosting exit and the set maximum operating time Smax; If H1≥S max , then turn on the heater to defrost the evaporator.
[0012] Further, the set standard temperature drop rate V is obtained x The specific method is: The temperature drop rate V in the first refrigeration cycle after the first defrost z The difference between ΔV and V is used as the standard temperature drop rate V x , where ΔV is the set temperature drop rate change value.
[0013] Furthermore, the temperature drop rate V of the refrigerator compartment in each refrigeration cycle is obtained by the following calculation formula: V=(T1-T2) / S, where T1 is the initial temperature of the freezer compartment when it starts cooling in each cooling cycle, T2 is the end temperature of the freezer compartment when it stops cooling in each cooling cycle, and S is the cooling time of the freezer compartment in each cooling cycle.
[0014] The present invention also provides a refrigerator, comprising a refrigeration cycle loop formed by sequentially connecting a compressor, a condenser and an evaporator, wherein a controller of the refrigerator executes the refrigerator defrosting control method as described above.
[0015] Compared with the prior art, the refrigerator defrosting control method and refrigerator provided by the present invention have the following beneficial effects: the present invention detects the temperature drop rate V of the refrigerator compartment in each refrigeration cycle, and if the temperature drop rate V of the refrigerator compartment is less than the set standard temperature drop rate V x , indicating that the frost layer on the evaporator has affected the normal working state of the evaporator and needs to be defrosted. At this time, the heater is turned on to defrost the evaporator; then according to the defrosting interval t n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 Determine the defrost exit conditions and realize intelligent adjustment of defrost exit conditions, effectively solve the problem of over-defrosting or insufficient defrosting in traditional defrosting, and also help the evaporator to be in the best working state and reduce the impact of the defrost process on the internal temperature of the compartment, making the working state of the refrigerator more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0017] Figure 1 It is a schematic flow chart of the refrigerator defrosting control method in the present invention; Figure 2 It is a structural schematic diagram of the refrigerator refrigeration system of the present invention; Figure 3 It is a schematic diagram of the first stage of the process of the refrigerator defrosting control method of the present invention; Figure 4 It is a schematic diagram of the second stage of the process of the refrigerator defrosting control method of the present invention; Among them, the main marks of the drawings in the figure are: 1. Compressor; 2. Condenser; 3. Condensing fan; 4. Anti-condensation tube; 5. Dry filter; 6. Capillary; 7. Freezer compartment temperature sensor; 8. Evaporator; 9. Evaporator outlet temperature sensor. DETAILED DESCRIPTION
[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0019] The inventor has found that the existing defrosting method of refrigerators has the following problems: 1) the existing defrosting method of refrigerators has the problem of incomplete defrosting or excessive defrosting; 2) the existing defrosting method cannot be dynamically adjusted in time according to the actual changes in the refrigerator state; 3) the existing defrosting method is a single programmed defrosting mechanism, which causes the temperature inside the refrigerator compartment to fluctuate frequently, thereby affecting the stable operation of the refrigerator. In order to solve the above series of problems, the present invention proposes a refrigerator defrosting control method and a refrigerator.
[0020] like Figure 1 As shown, the refrigerator defrosting control method proposed by the present invention at least includes the following steps: Obtain the temperature drop rate V of the refrigerator compartment in each refrigeration cycle and set the standard temperature drop rate V x ; If V≤V 标 , then turn on the heater to defrost the evaporator; After entering this defrost, according to the defrost interval t of this defrost n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 Determine the exit condition of this defrost.
[0021] The present invention detects the temperature drop rate V of the refrigerator compartment in each refrigeration cycle. If the temperature drop rate V of the refrigerator compartment is less than the set standard temperature drop rate V x, indicating that the frost layer on the evaporator has affected the normal working state of the evaporator and needs to be defrosted. At this time, the heater is turned on to defrost the evaporator; then according to the defrosting interval t n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 Determine the defrost exit conditions and realize intelligent adjustment of defrost exit conditions, effectively solve the problem of over-defrosting or insufficient defrosting in traditional defrosting, and also help the evaporator to be in the best working state and reduce the impact of the defrost process on the internal temperature of the compartment, making the working state of the refrigerator more stable.
[0022] In a further preferred embodiment of the present invention, according to the defrosting interval t of this defrosting n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 Determine the defrost exit conditions include: If n ≥t x , then when the defrost is executed, the real-time evaporator temperature T a ≥First set evaporator temperature T c When the defrost is stopped, the current defrost will be terminated. If n <t 标 And T n-1 ≥T c +ΔT, then the real-time evaporator temperature T when this defrost is executed a ≥The second set evaporator temperature T z When the defrost is stopped, the current defrost will be terminated. If n <t 标 And T n-1 <T c +ΔT, then the real-time evaporator temperature T during this defrost execution a ≥First set evaporator temperature T c After that, when the heater continues heating time to reach the set extension time of this defrost, the defrost is exited.
[0023] The present invention obtains the defrosting interval t of this defrosting n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 , and set different defrost exit conditions based on these parameters to achieve intelligent adjustment of defrost exit conditions and reduce the impact of the defrost process on the internal temperature of the refrigerator compartment.
[0024] If the defrost interval of this defrost is t n Greater than or equal to the set standard frost interval tx , indicating that the frost layer on the evaporator can be kept at a level that does not affect the normal operation of the evaporator under the current working conditions, so there is no need for additional defrosting. At this time, the defrost exit condition is set as: the evaporator temperature T when the defrost exits n The first set evaporator temperature T c In actual application, the first set evaporator temperature T c The default value is 0℃. Because the evaporator stays at 0℃ for the longest time during the defrost process, selecting 0℃ as the defrost exit temperature can greatly reduce the heater working time, thereby achieving energy saving.
[0025] If the defrost interval of this defrost is t n Less than the set standard frost interval t x , it means that defrosting is too frequent, and the frost on the evaporator has affected the performance of the evaporator, and additional defrosting is needed. Further, by judging the evaporator temperature T when the last defrost was exited n-1 With the first set evaporator temperature T c The size relationship can be used to select different defrost exit conditions.
[0026] Specifically, if the evaporator temperature T n-1 Greater than or equal to the first set evaporator temperature T c The sum of the temperature change value ΔT set manually indicates that the frost layer on the evaporator has accumulated to a certain thickness after the previous intelligent defrosting, and it is necessary to enter normal defrosting to remove all the frost on the evaporator. At this time, the defrosting exit condition is set as: the evaporator temperature T when the defrost exits n Set the evaporator temperature T for the second z , the second set evaporator temperature T z It is the exit temperature under normal defrosting.
[0027] On the contrary, if the evaporator temperature T n-1 Less than the first set evaporator temperature T c The sum of the temperature change value ΔT set manually indicates that the defrost time needs to be extended to ensure the appropriate defrost effect, but there is no need to enter normal defrost. At this time, the defrost exit condition is set as: the real-time evaporator temperature T during the execution of this defrost a ≥First set evaporator temperature T c After that, the heater continues heating for the set extended time of this defrost.
[0028] In a further preferred embodiment of the present invention, when the heater continues to heat, if T a ≥T c +ΔT, the defrost will be terminated in advance.
[0029] In the process of extending the defrost time, the present invention also combines the defrost temperature conditions to comprehensively judge whether to exit the current defrost, thereby ensuring that a suitable defrost effect is achieved while reducing the power consumption of the heater, thereby achieving a more energy-saving effect.
[0030] In a further preferred embodiment of the present invention, before obtaining the temperature drop rate V of the refrigerator compartment in each refrigeration cycle, the method further comprises: After the refrigerator is powered on for the first time, if the conditions for entering the first defrost are met, the heater is turned on to defrost the evaporator; After entering the first defrost, if the first defrost exit conditions are met, the first defrost will be exited.
[0031] In order to prevent premature defrosting, the present invention performs the first defrosting according to the first defrosting entry condition and the first defrosting exit condition preset in advance after the refrigerator is powered on for the first time, so as to completely remove the frost on the evaporator. After the first defrosting is completed, the compressor starts to work normally and enters a normal refrigeration cycle, and then adjusts the defrosting cycle of the refrigerator in real time by dynamically monitoring the temperature drop rate inside the refrigerator compartment and the real-time status of the refrigerator, thereby ensuring that the evaporator is always in the best working state and reducing the impact of the defrosting process on the temperature inside the refrigerator compartment, so that the working state of the refrigerator is more stable.
[0032] In a further preferred embodiment of the present invention, the first defrost entry condition is that the running time H0 of the refrigerator after being powered on for the first time reaches the set waiting time Q for the first defrost.
[0033] The present invention takes into account that it generally takes a certain amount of time for the refrigerator to reach a stable state after being powered on for the first time, and thus determines whether to enter the first defrost according to the running time H0 of the refrigerator after being powered on for the first time and the set waiting time Q for the first defrost, thereby effectively avoiding the impact of the defrost operation on the refrigerator immediately after being powered on for the first time, thereby affecting the refrigeration effect of the refrigerator and the normal operation of internal components.
[0034] In a further preferred embodiment of the present invention, the first defrost exit condition is the real-time evaporator temperature T when the first defrost is executed. a ≥The second set evaporator temperature T z , the second set evaporator temperature T z It is the exit temperature under normal defrosting.
[0035] It can be understood that the second set evaporator temperature T z It is the temperature value preset in advance to completely remove the frost on the evaporator. In the subsequent defrosting process, as long as the defrosting exit condition is determined as: the temperature at the time of defrosting exit is the second set evaporator temperature T z , that is, normal defrosting is carried out.
[0036] The present invention sets the first defrosting to be performed according to the normal defrosting after the refrigerator is powered on for the first time, so as to ensure that the frost on the evaporator can be completely removed.
[0037] In a further preferred embodiment of the present invention, the refrigerator defrosting control method further includes: Obtain the operating time H1 of the refrigerator after the first defrosting exit and the set maximum operating time Smax; If H1≥S max , then turn on the heater to defrost the evaporator.
[0038] While monitoring the temperature drop rate inside the refrigerator compartment, the present invention also combines the refrigerator operation time to comprehensively judge whether to enter the intelligent defrosting, thereby improving accuracy. max , it means that the frost layer on the evaporator has affected the normal working state of the evaporator and needs to be defrosted.
[0039] In a further preferred embodiment of the present invention, the refrigerator defrosting control method further includes: after entering the current defrosting, according to the running time H of the refrigerator after the last defrosting is exited n With the set standard running time H max Determine the defrost exit condition. It should be understood that after each defrost is completed, the timer is reset and restarted to record the running time H before each defrost. n , here set the standard running time H max The maximum running time S is set as above. max If the refrigerator runs for T n Greater than or equal to the set standard operating time H max , it means that under the current working conditions, the frost layer on the evaporator can be kept at a level that does not affect the normal operation of the evaporator, so there is no need to perform additional defrosting. At this time, the defrost exit condition is set as: the evaporator temperature T when the defrost exits n The first set evaporator temperature T c In actual application, the first set evaporator temperature T c The default value is 0℃. Because the evaporator stays at 0℃ for the longest time during the defrost process, selecting 0℃ as the defrost exit temperature can greatly reduce the heater working time, thereby achieving energy saving.
[0040] In a further preferred embodiment of the present invention, the set standard temperature drop rate V is obtained. x The specific method is: The temperature drop rate V in the first refrigeration cycle after the first defrost z The difference between ΔV and V is used as the standard temperature drop rate Vx , where ΔV is the artificially set temperature drop rate change value.
[0041] The present invention adopts the method of setting the standard temperature drop rate V x The temperature drop rate V in the first refrigeration cycle after the first defrost z Related, due to the temperature drop rate V in the first refrigeration cycle after the first defrost z Close to the optimal value, the design is more reasonable.
[0042] In a further preferred embodiment of the present invention, the temperature drop rate V of the refrigerator compartment in each refrigeration cycle is obtained by the following calculation formula: V=(T1-T2) / S, where T1 is the initial temperature of the freezer compartment when it starts cooling in each cooling cycle, T2 is the end temperature of the freezer compartment when it stops cooling in each cooling cycle, and S is the cooling time of the freezer compartment in each cooling cycle.
[0043] Generally speaking, refrigerator compartments are divided into a refrigerating compartment and a freezing compartment. The present invention monitors the temperature drop rate of the freezing compartment in each refrigeration cycle, which can more accurately reflect the state of the frost layer on the evaporator.
[0044] like Figure 2 As shown, the refrigerator proposed by the present invention includes a refrigeration cycle formed by sequentially connecting a compressor 1, a condenser 2 and an evaporator 8, and the controller of the refrigerator executes the refrigerator defrosting control method as described above. Since the defrosting effect of the refrigerator is better, the working state of the refrigerator is more stable.
[0045] For a better understanding, a more complete description is given below of the refrigerator defrosting control method and the refrigerator proposed in the present invention.
[0046] Specifically, if Figure 2 As shown, the refrigerator refrigeration system at least includes a compressor 1, a condenser 2, a condensing fan 3, an anti-condensation tube 4, a drying filter 5, a capillary tube 6, an evaporator 8, an evaporator 8 outlet temperature sensor and a freezer compartment temperature sensor 7, etc.
[0047] It should be noted that the defrost stage in the present invention includes pre-cooling, return air defrosting, defrost heater operation, dripping and strong cooling stages. Except for the defrost heater working stage, the other stages are basically the same as the defrost stage of an ordinary air-cooled refrigerator. The defrost heater working stage is described in detail below.
[0048] like Figure 3 , Figure 4 As shown, the working stages of the defrost heater are divided into the first stage and the second stage.
[0049] In the first stage, normal defrosting is used for the first defrost.
[0050] First, the refrigerator is powered on, and the refrigerator refrigeration system runs normally after self-checking. After running for a period of time, the system detects that the running time H0 of the refrigerator after the first power-on reaches the set waiting time Q for the first defrost, and turns on the heater to enter the first defrost. The system detects the real-time evaporator temperature T when the first defrost is executed. a Reach the second set evaporator temperature T z , exit the first defrost.
[0051] In the second stage, each subsequent defrost may be intelligent defrost or normal defrost. It should be understood that intelligent defrost here means that the evaporator temperature when defrosting exits is not the second set evaporator temperature T z Here, normal defrosting means that the evaporator temperature when defrosting exits is the second set evaporator temperature T z .
[0052] After the first defrost, the compressor starts working normally and enters the normal refrigeration cycle. The system records the initial temperature T1 of the freezer at the start of each refrigeration cycle and the end temperature T2 of the freezer at the stop of each refrigeration cycle through the temperature sensor and timer inside the freezer, as well as the refrigeration time S of the freezer. The temperature drop rate V of the freezer in each refrigeration cycle can be obtained as (T1-T2) / S. The temperature drop rate V in the first refrigeration cycle after the first defrost is also taken as z The difference between ΔV and V is used as the standard temperature drop rate V x , where ΔV is the artificially set temperature drop rate change value.
[0053] The conditions for entering the second stage of defrosting are as follows: When the system detects that the temperature drop rate V of the freezer in each refrigeration cycle is less than the set standard temperature drop rate V x , or, the operating time of the refrigerator after the last defrost exit H n ≥Set the maximum running time S max , it means that the frost layer on the evaporator has affected the normal working state of the evaporator and needs to be defrosted. At this time, turn on the heater to defrost the evaporator.
[0054] The second stage defrost exit conditions are as follows: According to the defrosting interval t of each defrosting (also called this defrosting) n , set the standard frost interval t x The evaporator temperature T when the most recent defrost (also called the last defrost) exits n-1 Determine the exit conditions for each defrost.
[0055] If the defrost interval of this defrost is t n ≥Set the standard frost interval t x, or, the operating time of the refrigerator after the last defrost exit H n ≥Set standard operating time H max , it means that the frost layer on the evaporator can be kept at a level that does not affect the normal operation of the evaporator under the current working conditions, so there is no need to perform additional defrosting. At this time, the defrost exit condition is set as: the evaporator temperature T when the defrost exits n The first set evaporator temperature T c In actual application, the first set evaporator temperature T c The default value is 0℃, because the evaporator stays at 0℃ for the longest time during the defrosting process. Selecting 0℃ as the defrosting exit temperature can greatly reduce the heater working time, thereby achieving energy saving. The system detects the real-time evaporator temperature T when the defrosting is executed. a ≥ the first set evaporator temperature Tc, immediately exit the defrosting.
[0056] If the defrost interval of this defrost is t n <Setting the standard frost interval t x , it means that the system is defrosted frequently, and the frost on the evaporator has affected the performance of the evaporator, and additional defrosting is required.
[0057] Next, by judging the evaporator temperature T when the last defrost was exited n-1 ≥First set evaporator temperature T c + Whether the artificially set temperature change value Δt is established to select different defrost exit conditions.
[0058] If the evaporator temperature T n-1 ≥First set evaporator temperature T c + artificially set temperature change value Δt, it means that the frost layer on the evaporator has accumulated to a certain thickness after the previous intelligent defrosting, and it is necessary to enter normal defrosting to remove all the frost on the evaporator. At this time, the defrosting exit condition is set as: the evaporator temperature T when the defrost exits n Set the evaporator temperature T for the second z , the second set evaporator temperature T z It is the exit temperature under normal defrosting. The system detects the real-time evaporator temperature T when this defrosting is executed. a ≥The second set evaporator temperature T z When the function is turned on, the defrost process will be terminated immediately.
[0059] On the contrary, if the evaporator temperature T n-1 <First set evaporator temperature T c+ artificially set temperature change value Δt, it means that the defrost time needs to be extended to ensure the appropriate defrost effect but there is no need to enter normal defrost. At this time, the defrost exit condition is set as: the real-time evaporator temperature T during the execution of this defrost a ≥First set evaporator temperature T c After that, the heater continues to heat for a time equal to the set extension time of this defrost and then exits this defrost. However, when the heater continues to heat, if the real-time evaporator temperature T a ≥First set evaporator temperature T c + artificially set temperature change value Δt, then exit this defrost in advance. The specific setting method of setting the extension time of this defrost is: if there have been N consecutive defrosts before this defrost, the defrost interval is t n <Setting the standard frost interval t x , the defrost time of this defrost needs to be extended by N*ΔQ, where ΔQ is the artificially set time change value.
[0060] After each defrost exits, the normal refrigeration cycle is entered, and the next defrost is entered by re-detecting the temperature drop rate V of the refrigerator compartment during the refrigeration cycle and the running time H of the refrigerator after the defrost exits.
[0061] The present invention dynamically monitors the temperature drop rate inside the freezer compartment of the refrigerator after defrosting and the real-time status of the refrigerator, and adjusts the defrost cycle of the refrigerator in real time, thereby ensuring that the evaporator is always in the best working state and reducing the impact of the defrosting process on the temperature inside the freezer compartment of the refrigerator, making the working state of the refrigerator more stable, and effectively solving the problem of excessive defrosting or insufficient defrosting in traditional defrosting. At the same time, by intelligently adjusting the defrost time, the power consumption of the heater and the evaporator is reduced, thereby achieving a more energy-saving effect.
[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A refrigerator defrosting control method, characterized in that: include: Obtain the temperature drop rate V of the refrigerator compartment in each refrigeration cycle and set the standard temperature drop rate V x ; If V≤V 标 , then turn on the heater to defrost the evaporator; After entering this defrost, according to the defrost interval t of this defrost n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 Determine the exit condition of this defrost.
2. The refrigerator defrosting control method according to claim 1, characterized in that: The defrost interval t according to this defrost n , set the standard frost interval t x The evaporator temperature T when the last defrost exited n-1 Determine the defrost exit conditions include: If n ≥t x , then when the defrost is executed, the real-time evaporator temperature T a ≥First set evaporator temperature T c When the defrost is stopped, the current defrost will be terminated. If n <t 标 And T n-1 ≥T c +ΔT, then the real-time evaporator temperature T when this defrost is executed a ≥The second set evaporator temperature T z When the defrost is stopped, the current defrost will be terminated. If n <t 标 And T n-1 <T c +ΔT, then the real-time evaporator temperature T during this defrost execution a ≥First set evaporator temperature T c After that, when the heater continues heating time to reach the set extension time of this defrost, the defrost is exited.
3. The refrigerator defrosting control method according to claim 2, characterized in that: While the heater continues to heat, if T a ≥T c +ΔT, the defrost will be terminated in advance.
4. The refrigerator defrosting control method according to claim 1, characterized in that: Before obtaining the temperature drop rate V of the refrigerator compartment in each refrigeration cycle, it also includes: After the refrigerator is powered on for the first time, if the conditions for entering the first defrost are met, the heater is turned on to defrost the evaporator; After entering the first defrost, if the first defrost exit conditions are met, the first defrost will be exited.
5. The refrigerator defrosting control method according to claim 4, characterized in that: The first defrost entry condition is that the running time H0 of the refrigerator after the first power-on reaches the set waiting time Q for the first defrost.
6. The refrigerator defrosting control method according to claim 4, characterized in that: The first defrost exit condition is the real-time evaporator temperature T when the first defrost is executed. a ≥The second set evaporator temperature T z .
7. The refrigerator defrosting control method according to claim 4, characterized in that: Also includes: Obtain the operating time H1 of the refrigerator after the first defrosting exit and the set maximum operating time Smax; If H1≥S max , then turn on the heater to defrost the evaporator.
8. The refrigerator defrosting control method according to claim 4, characterized in that: Get the set standard temperature drop rate V x The specific method is: The temperature drop rate V in the first refrigeration cycle after the first defrost z The difference between ΔV and V is used as the standard temperature drop rate V x , where ΔV is the set temperature drop rate change value.
9. The refrigerator defrosting control method according to claim 1, characterized in that: The temperature drop rate V of the refrigerator compartment in each refrigeration cycle is obtained by the following calculation formula: V = (T1-T2) / S, where T1 is the initial temperature of the freezer compartment when it starts cooling in each cooling cycle, T2 is the end temperature of the freezer compartment when it stops cooling in each cooling cycle, and S is the cooling time of the freezer compartment in each cooling cycle.
10. A refrigerator comprising a refrigeration cycle formed by sequentially connecting a compressor, a condenser and an evaporator, characterized in that: The controller of the refrigerator executes the refrigerator defrosting control method according to any one of claims 1 to 9.