CN112984891A - Refrigerator and defrosting control method thereof - Google Patents
Refrigerator and defrosting control method thereof Download PDFInfo
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- CN112984891A CN112984891A CN201911274770.4A CN201911274770A CN112984891A CN 112984891 A CN112984891 A CN 112984891A CN 201911274770 A CN201911274770 A CN 201911274770A CN 112984891 A CN112984891 A CN 112984891A
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- 238000010257 thawing Methods 0.000 title claims abstract description 187
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 12
- 239000003507 refrigerant Substances 0.000 abstract description 16
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000005057 refrigeration Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a refrigerator and a defrosting control method thereof. The refrigerator defrosting control method comprises the following steps: acquiring a suction pressure value of a compressor of the refrigerator; judging whether the suction pressure value is greater than or equal to a preset pressure reference value or not; and if so, starting a defrosting program to defrost the evaporator of the refrigerator. The technical scheme of the invention is based on the principle that the frosting of the refrigerator evaporator can cause the heat exchange efficiency of the evaporator to be poor, so that the refrigerant can not be completely evaporated in the evaporator, thereby causing the pressure increase of the air suction end of the compressor, realizes automatic defrosting as required by identifying the change of the air suction pressure of the compressor, ensures the complete defrosting, reduces the energy consumption of the refrigerator, and avoids the problems of frost blockage and the like caused by incomplete defrosting for a long time.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a refrigerator and a defrosting control method thereof.
Background
In the process of using a refrigerator (such as an air-cooled refrigerator), because frequent opening and closing of a door, excessive moisture of stored food, seasons or a place where the refrigerator is placed and other factors may cause frosting of an evaporator of the refrigerator, and reduce the refrigeration performance of the refrigerator, in practical application, defrosting of the evaporator of the refrigerator is usually required.
In the prior art, for an air-cooled refrigerator, a defrosting starting point is usually determined according to a preset fixed time interval after last defrosting is finished, an ending point is determined by sensing the temperature of an evaporator through a sensor, and defrosting is finished when the temperature of the evaporator reaches a certain temperature. However, because the temperature of each part of the evaporator is generally not completely uniform, the temperature sensed by the sensor is different due to different positions of the sensor, and then the defrosting effect reached at the determined defrosting end point is different, so that the problem of incomplete defrosting is caused, the frost is accumulated on the evaporator, the heat exchange efficiency is reduced, and the energy consumption of the refrigerator is increased. In addition, because every two adjacent defrosting processes are carried out according to a fixed time interval, residual frosting caused by incomplete defrosting in the last defrosting process cannot be removed in time, and thus, the fan can not act due to frost blockage caused by incomplete defrosting for a long time, and finally the problem that the refrigerator is not refrigerated or poor in refrigeration is caused.
Disclosure of Invention
The invention aims to provide a refrigerator defrosting control method which can be used for defrosting as required so as to avoid frost blockage or incomplete defrosting.
A further object of the invention is to avoid frequent starting of defrosting and to reduce unnecessary energy consumption while ensuring complete defrosting.
According to an aspect of the present invention, there is provided a refrigerator defrosting control method including:
acquiring a suction pressure value of a compressor of the refrigerator;
judging whether the suction pressure value is greater than or equal to a preset pressure reference value or not;
and if so, starting a defrosting program to defrost the evaporator of the refrigerator.
Optionally, after determining that the suction pressure value is greater than or equal to the preset pressure reference value, the method further includes:
detecting the time interval between the current moment and the last defrosting ending moment;
judging whether the time interval is greater than or equal to a preset defrosting reference period or not;
and if the time interval is greater than or equal to the defrosting reference period, executing a step of starting a defrosting program to defrost the evaporator of the refrigerator.
Optionally, before the step of obtaining the suction pressure value of the compressor of the refrigerator, the method further comprises: judging whether the refrigerator is powered on for the first time;
and if the refrigerator is not powered on for the first time, executing the step of acquiring the suction pressure value of the compressor of the refrigerator.
Optionally, if the refrigerator is powered on for the first time, recording the running time of the refrigerator after the refrigerator is powered on for the first time;
and when the running time reaches the preset defrosting time, starting a defrosting program to defrost the evaporator.
Optionally, before the step of obtaining the suction pressure value of the compressor of the refrigerator, the method further comprises: judging whether the timing time from the last defrosting ending time to the current time is greater than or equal to a preset defrosting reference period or not;
and if the timing time is greater than or equal to the defrosting reference period, executing the step of acquiring the suction pressure value of the compressor of the refrigerator.
Optionally, after the step of starting the defrosting program to defrost the evaporator of the refrigerator, the method further includes:
judging whether the defrosting end point is reached or not;
and if the defrosting end point is reached, ending the defrosting program.
Optionally, the step of determining whether the defrosting end point is reached comprises:
acquiring the temperature of an evaporator;
judging whether the temperature of the evaporator is greater than or equal to a preset defrosting completion temperature or not;
and if the temperature of the evaporator is greater than or equal to the defrosting completion temperature, judging that the defrosting end point is reached.
Optionally, the step of obtaining a suction pressure value of a compressor of the refrigerator comprises:
and acquiring the suction pressure value of the compressor of the refrigerator in real time.
Optionally, the step of obtaining a suction pressure value of a compressor of the refrigerator comprises:
a suction pressure value of a compressor of the refrigerator is periodically acquired.
According to another aspect of the present invention, there is also provided a refrigerator including:
a compressor;
an evaporator;
the pressure detection device is arranged at the air suction end of the compressor and used for detecting the air suction pressure of the compressor;
a heating device; and
and the control device is respectively connected with the pressure detection device and the heating device and is configured to execute the refrigerator defrosting control method in any one of the above modes so as to control the heating device to defrost the evaporator.
The refrigerator defrosting control method comprises the steps of obtaining the suction pressure value of a compressor of a refrigerator, comparing the suction pressure value with a preset pressure reference value, and starting a defrosting program to defrost an evaporator of the refrigerator when the suction pressure value of the compressor is larger than or equal to the pressure reference value. The method is based on the principle that the frost formation of the refrigerator evaporator can cause poor heat exchange efficiency of the evaporator, so that the refrigerant can not be completely evaporated in the evaporator, and the pressure of the air suction end of the compressor is increased, and the automatic on-demand defrosting is realized by identifying the change of the air suction pressure of the compressor, so that the complete defrosting is ensured, the energy consumption of the refrigerator is reduced, and the problems of frost blockage and the like caused by incomplete defrosting for a long time are avoided.
Furthermore, in the refrigerator defrosting control method of the present invention, a time interval from the current time to the last defrosting end time is also detected, and defrosting is started only when the suction pressure value of the compressor is greater than or equal to the pressure reference value and the time interval is greater than or equal to a preset defrosting reference period. Whether defrosting is started or not is determined by combining two conditions of the change of the suction pressure of the compressor and the time interval from the last defrosting end point, frequent starting of defrosting can be avoided on the premise of ensuring complete defrosting, unnecessary energy loss is reduced, and defrosting efficiency and effectiveness are further improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic structural view of a refrigerator according to one embodiment of the present invention;
fig. 2 is a flowchart illustrating a defrosting control method for a refrigerator according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a defrosting control method for a refrigerator according to another embodiment of the present invention;
fig. 4 is a flowchart illustrating a defrosting control method for a refrigerator according to still another embodiment of the present invention;
fig. 5 is a flowchart illustrating a defrosting control method for a refrigerator according to still another embodiment of the present invention;
fig. 6 is a flowchart illustrating a defrosting control method for a refrigerator according to still another embodiment of the present invention.
Detailed Description
A refrigerator may generally include a compressor, an evaporator, and a condenser to constitute a refrigeration system. When a refrigeration system of the refrigerator works, a compressor sucks low-pressure refrigerant steam and compresses the low-pressure refrigerant steam into high-temperature high-pressure refrigerant steam, the high-temperature high-pressure refrigerant steam is condensed into high-pressure refrigerant liquid through a condenser, the high-pressure refrigerant liquid enters an evaporator, the pressure of the high-pressure refrigerant liquid is sharply reduced, the high-pressure refrigerant liquid is violently evaporated and converted into low-pressure steam, and then the low-pressure steam flows into the compressor to finish a refrigeration cycle. After the refrigerator runs for a long time, frost can be formed on the evaporator, so that the refrigerating effect is influenced.
In the prior art, a refrigerator generally performs defrosting according to a preset fixed time interval, and defrosting is finished by monitoring the temperature of an evaporator in the defrosting process, which easily causes the problem of incomplete defrosting, and further causes the faults of fan frost blockage and the like.
The inventor has studied and found that when the evaporator of the refrigerator is frosted, the heat exchange efficiency of the evaporator is reduced, so that the refrigerant can not be completely evaporated in the evaporator, and the pressure of the suction end of the compressor is increased. Therefore, the change of the refrigerant pressure (namely, the suction pressure) at the suction end of the compressor can timely and accurately indicate the frosting condition of the evaporator.
Based on the above principle, embodiments of the present invention provide a refrigerator that implements automatic defrosting by recognizing a suction pressure variation of a compressor.
Fig. 1 shows a schematic structural view of a refrigerator 10 according to one embodiment of the present invention. Referring to fig. 1, the refrigerator 10 may generally include a compressor 110, an evaporator 120, a pressure detecting device 130, a heating device 140, and a control device 150. The refrigerant outlet of the evaporator 120 communicates with the suction side of the compressor 110 through a pipe so that the low-pressure refrigerant vapor flowing out of the evaporator 120 flows into the suction side of the compressor 110; the outlet of the compressor 110 may communicate with the inlet of the evaporator 120 through a conventional condensing device, a throttling device, etc., thereby forming a circulation path of the refrigerant. Other condensing, throttling, etc. devices are not shown in fig. 1 in order not to obscure the understanding of the present invention. The pressure detecting device 130 is disposed at a suction end of the compressor 110, and is configured to detect a suction pressure of the compressor 110. The pressure detecting device 130 may be, for example, a pressure sensor, a pressure gauge, etc., and the present invention is not limited thereto. The heating device 140 may be disposed above, below, or on the side of the evaporator 120, etc., for heating the evaporator 120 to defrost. The heating device 140 may be, for example, a defrosting heater wire or the like. The control device 150 is respectively connected to the pressure detection device 130 and the heating device 140, and is configured to acquire the suction pressure value of the compressor 110 detected by the pressure detection device 130, compare the acquired suction pressure value of the compressor 110 with a preset pressure reference value, and determine whether the suction pressure value is greater than or equal to the pressure reference value. If the suction pressure value is greater than or equal to the pressure reference value, the control device 150 starts a defrosting procedure to control the heating device 140 to operate to defrost the evaporator 120 of the refrigerator 10.
Accordingly, embodiments of the present invention also provide a refrigerator defrosting control method, which may be performed by the control device 150, for defrosting the evaporator 120 of the refrigerator 10.
Fig. 2 is a flowchart illustrating a refrigerator defrosting control method according to an embodiment of the present invention. Referring to fig. 2, the method may include at least steps S202 to S206.
In step S202, the suction pressure value of the compressor 110 of the refrigerator 10 is acquired.
In step S204, it is determined whether the acquired suction pressure value of the compressor 110 is greater than or equal to a preset pressure reference value, and if so, step S206 is executed.
In step S206, the defrosting program is started to defrost the evaporator 120 of the refrigerator 10.
In the refrigerator defrosting control method according to the embodiment of the present invention, the suction pressure value of the compressor 110 of the refrigerator 10 is obtained and compared with the preset pressure reference value, when the suction pressure value of the compressor 110 is greater than or equal to the pressure reference value, it is determined that the evaporator 120 is frosted, and the heat exchange performance of the evaporator 120 is in an unreliable state, and at this time, a defrosting program is started to defrost the evaporator 120 of the refrigerator 10. By identifying the change of the suction pressure of the compressor 110, the frosting condition of the evaporator 120 can be found in time, so that automatic defrosting as required is realized, the defrosting can be ensured to be complete, the energy consumption of the refrigerator is reduced, and the problems of frost blockage and the like caused by incomplete defrosting for a long time are avoided.
In the above step S202, the suction pressure value of the compressor 110 may be acquired by the pressure detection device 130 disposed at the suction end of the compressor 110.
In one embodiment, the suction pressure value of the compressor 110 of the refrigerator 10 may be obtained in real time, so that the frosting condition of the evaporator 120 can be found more timely. In another embodiment, the suction pressure value of the compressor 110 of the refrigerator 10 may be periodically obtained at a designated interval, so that on the premise that the frost formation of the evaporator 120 is timely detected, resource consumption caused by frequent pressure obtaining and execution of the judgment logic is avoided, and the processing efficiency is ensured.
In addition, in order to avoid erroneous judgment due to pressure fluctuation of the refrigerant, the judgment may be performed by acquiring a plurality of suction pressure values of the compressor 110 and then comparing an average value of the plurality of suction pressure values with a preset pressure reference value.
The acquired suction pressure value of the compressor 110 is compared and judged with the preset pressure reference value in the above step S204. The pressure reference value mentioned herein refers to an empirical value of suction pressure of the compressor under the condition that the heat exchange performance of the evaporator can be guaranteed to meet the refrigeration demand, and is related to the model, performance, use scene and the like of the refrigerator. In one embodiment, the pressure reference value may be obtained by counting the suction pressure of the compressor 110 under normal refrigeration condition of the refrigerator 10.
In the step S206, the heating device 140 may be controlled to operate by the defrosting program to defrost the evaporator 120.
In application, if whether defrosting is started or not is determined only according to the automatic detection of the suction pressure of the compressor, the refrigerator may be frequently subjected to defrosting operation, which is not favorable for ensuring the refrigeration effect of the refrigerator, and the energy consumption of the refrigerator may be greatly increased. To prevent this problem, in one embodiment, as shown in fig. 3, after determining that the suction pressure value of the compressor 110 is greater than or equal to the preset pressure reference value through step S204, the control device 150 may further perform the following steps:
in step S205a, the time interval between the current time and the last defrosting end time is detected.
In step S205b, it is determined whether the time interval is greater than or equal to a preset defrosting reference period.
Only when it is determined that the time interval is greater than or equal to the defrosting reference period, the step S206 (i.e., the step of starting the defrosting process to defrost the evaporator 120 of the refrigerator 10) is continuously performed. The detection of the time interval may be implemented by integrating a timing function in the control device 150, or by providing a timer connected to the control device 150 in the refrigerator 10, and the control device 150 acquires relevant time information from the timer. The defrosting reference cycle refers to a defrosting cycle experience value which can ensure that the refrigeration efficiency of the refrigerator can meet the refrigeration requirement, and is related to the type, performance, use scene and the like of the refrigerator. Generally, the defrosting reference period is smaller than the fixed time interval between two adjacent defrosting in the prior art.
Whether defrosting is started or not is determined by combining two conditions of the change of the suction pressure of the compressor 110 and the time interval from the last defrosting end point, frequent starting of defrosting can be avoided on the premise of ensuring complete defrosting, unnecessary energy loss is reduced, and defrosting efficiency and effectiveness are further improved.
In one embodiment, before the step S202 is executed to obtain the suction pressure value of the compressor 110 of the refrigerator 10, it may be determined whether the refrigerator 10 is powered on for the first time. Specifically, the control device 150 makes the determination by acquiring a power-on signal of the refrigerator 10. If it is determined that the refrigerator 10 is not initially powered on, the control device 150 performs step S202 (i.e., a step of acquiring a suction pressure value of the compressor 110 of the refrigerator 10). When it is determined that the refrigerator 10 is not powered on for the first time, the frosting condition of the evaporator 120 can be timely discovered by recognizing the change of the suction pressure of the compressor 110, particularly, residual frosting caused by incomplete defrosting in the previous defrosting operation can be timely discovered, defrosting is timely performed as required, and complete defrosting is ensured.
In addition, if it is determined that the refrigerator 10 is initially powered on, the operation time of the refrigerator 10 after the initial power on is recorded. When the operation time of the refrigerator 10 after the initial power-on reaches the preset defrosting time, the defrosting process is started to defrost the evaporator 120. The preset defrosting time may be set according to the actual application condition of the refrigerator 10, for example, the preset defrosting time may be set to the time length of the conventional defrosting time interval of the refrigerator. Because the problem of frosting residue caused by incomplete defrosting does not exist when the refrigerator is powered on for the first time, and the probability of serious frosting is low, the defrosting is started according to the preset defrosting time under the condition that the refrigerator is powered on for the first time, the defrosting control operation can be simplified, the defrosting is ensured to be complete as much as possible, and the heat exchange efficiency of the evaporator 120 is ensured.
In one embodiment, after the defrosting process is started in step S206 to defrost the evaporator 120 of the refrigerator 10, the following steps may be further performed: judging whether the defrosting end point is reached or not; and if the defrosting end point is reached, ending the defrosting program. The defrosting end point may be determined according to the temperature of the evaporator 120, the defrosting time period, and the like. For example, when the defrosting time reaches a preset time, it is determined that the defrosting end point is reached.
In one embodiment, the step of determining whether the defrosting end point is reached may be specifically implemented as: first, the temperature of the evaporator 120 is acquired. Then, the temperature of the evaporator 120 is compared with a preset defrosting completion temperature, and it is determined whether the temperature of the evaporator 120 is greater than or equal to the defrosting completion temperature. If the temperature of the evaporator 120 is greater than or equal to the defrosting completion temperature, it is determined that the defrosting end point is reached. The temperature of the evaporator 120 mentioned herein may refer to a surface temperature of the evaporator 120, a center temperature of the evaporator 120, an evaporator bin temperature, and the like, which may be parameters that may characterize a temperature condition of the evaporator 120. The temperature of the evaporator 120 can be detected by a corresponding temperature detecting device (e.g., a temperature sensor), which is well known in the art and will not be described herein.
The above describes a scheme of determining whether to start defrosting by determining whether a time interval from the last defrosting end point is greater than or equal to a defrosting reference period after determining that the suction pressure value of the compressor 110 is greater than or equal to the pressure reference value. In another embodiment, it may also be determined whether the time interval from the last defrosting end point is greater than or equal to the defrosting reference period, and then whether to start defrosting is determined by combining the change of the suction pressure of the compressor 110. Referring to fig. 4, before step S202 is executed to obtain the suction pressure value of the compressor 110 of the refrigerator 10, the following step S201 may also be executed: and judging whether the timing time from the last defrosting ending time to the current time is greater than or equal to a preset defrosting reference period. Step S202 (i.e., the step of acquiring the suction pressure value of the compressor 110 of the refrigerator 10) is performed only when it is judged that the counted time from the last defrosting end time to the current time is greater than or equal to the defrosting reference period. The defrosting reference period is the same as that defined above and is not described herein.
The defrosting reference cycle is an empirical value of the defrosting cycle under the condition that the refrigeration efficiency of the refrigerator can meet the refrigeration requirement, namely, when the time interval from the last defrosting ending moment is within the defrosting reference cycle, the frosting on the evaporator can not enable the refrigeration efficiency of the refrigerator to not meet the requirement, so even if the suction pressure value of the compressor indicates that the evaporator is frosted, the defrosting is not required to be carried out immediately. Under the condition that the timing time from the last defrosting ending time to the current time is judged to be greater than or equal to the defrosting reference period, the suction pressure value of the compressor is obtained again to identify the change of the suction pressure of the compressor, frequent starting of defrosting can be avoided on the premise of ensuring complete defrosting, unnecessary energy loss is reduced, and defrosting efficiency and effectiveness are further improved.
Similarly, before determining whether the counted time from the last defrosting end time to the current time is greater than or equal to the preset defrosting reference period in step S201, it may also be determined whether the refrigerator 10 is powered on for the first time. If it is determined that the refrigerator 10 is not initially powered on, the control device 150 performs step S201. If the refrigerator 10 is powered on for the first time, the running time of the refrigerator 10 after the initial power-on is recorded. When the operation time of the refrigerator 10 after the initial power-on reaches the preset defrosting time, the defrosting process is started to defrost the evaporator 120.
Further, each time the defrosting process is finished, the timing function or the timer of the control device 150 may be utilized to start timing immediately.
In addition, after the refrigerator 10 is powered on, before the flow of the refrigerator defrosting control method according to the embodiment of the present invention is started, the refrigerator 10 may also perform self-checking to eliminate other fault reasons that may cause the suction pressure of the compressor 110 of the refrigerator 10 to be too high, such as the exhaust valve or the safety cover being not sealed, the expansion valve being improperly adjusted, the sealing ring of the compressor 110 being worn, and the like, so as to improve the accuracy and the effectiveness of defrosting control.
In the above, a plurality of implementation manners of the refrigerator defrosting control method provided by the embodiment of the present invention are introduced, and the implementation process of the refrigerator defrosting control method of the present invention will be described in detail through specific embodiments.
Example one
Fig. 5 is a flowchart illustrating a defrosting control method for a refrigerator according to an embodiment of the present invention. Referring to fig. 5, the method may include at least the following steps S502 to S522.
Step S502, determining whether the refrigerator 10 is powered on for the first time. If yes, go to step S504. If not, go to step S508.
In step S504, the operation time of the refrigerator 10 after the initial power-on is recorded.
In step S506, it is determined whether the operation time of the refrigerator 10 after the initial power-on reaches the preset defrosting time, and if so, the process goes to step S516.
In step S508, the suction pressure value of the compressor 110 of the refrigerator 10 is acquired.
The suction pressure value of the compressor 110 may be acquired by a pressure detecting device 130 provided at the suction end of the compressor 110.
In step S510, it is determined whether the acquired suction pressure value of the compressor 110 is greater than or equal to a preset pressure reference value. If yes, go to step S512. If not, the process returns to step S508.
And step S512, detecting the time interval between the current time and the last defrosting finish time.
The detection of the time interval may be implemented by integrating a timing function in the control device 150, or by providing a timer connected to the control device 150 in the refrigerator 10, and the control device 150 acquires relevant time information from the timer.
In step S514, it is determined whether the time interval is greater than or equal to a preset defrosting reference period. If yes, go to step S516, otherwise, go back to step S508.
In step S516, the defrosting program is started to defrost the evaporator 120 of the refrigerator 10.
The operation of the heating device 140 may be controlled by a defrosting program to defrost the evaporator 120.
In step S518, the temperature of the evaporator 120 is acquired.
In the present embodiment, the temperature of the evaporator compartment is obtained as the temperature of the evaporator 120 by the temperature detection device provided in the evaporator compartment.
In step S520, it is determined whether the temperature of the evaporator 120 is greater than or equal to a predetermined defrosting completion temperature, and if so, step S522 is executed.
In step S522, the defrosting process is ended, and this process is ended.
In the embodiment, when the refrigerator 10 is not powered on for the first time, whether defrosting is started or not is determined by firstly judging the change of the suction pressure of the compressor 110 and then judging whether the time interval from the last defrosting end point meets the condition, so that frequent starting defrosting can be avoided on the premise of ensuring complete defrosting, unnecessary energy loss is reduced, and the defrosting efficiency and effectiveness are further improved.
Example two
Fig. 6 is a flowchart illustrating a defrosting control method for a refrigerator according to another embodiment of the present invention. Referring to fig. 6, the method may include at least the following steps S602 to S620.
In step S602, it is determined whether the refrigerator 10 is powered on for the first time. If yes, go to step S604. If not, go to step S608.
In step S604, the operation time of the refrigerator 10 after the initial power-on is recorded.
Step S606, it is determined whether the operation time of the refrigerator 10 after the initial power-on reaches a preset defrosting time, and if so, the process goes to step S614.
In step S608, it is determined whether the time counted from the last defrosting end time to the current time is greater than or equal to a preset defrosting reference period, and if so, step S610 is executed.
In step S610, a suction pressure value of the compressor 110 of the refrigerator 10 is acquired.
The suction pressure value of the compressor 110 may be acquired by a pressure detecting device 130 provided at the suction end of the compressor 110.
In step S612, it is determined whether the acquired suction pressure value of the compressor 110 is greater than or equal to a preset pressure reference value. If yes, go to step S614. If not, the process returns to step S610.
In step S614, the defrosting process is started to defrost the evaporator 120 of the refrigerator 10.
The operation of the heating device 140 may be controlled by a defrosting program to defrost the evaporator 120.
In step S616, the temperature of the evaporator 120 is acquired.
In the present embodiment, the temperature of the evaporator compartment is obtained as the temperature of the evaporator 120 by the temperature detection device provided in the evaporator compartment.
In step S618, it is determined whether the temperature of the evaporator 120 is greater than or equal to a predetermined defrosting completion temperature, and if so, step S620 is executed.
And step S620, ending the defrosting program, starting timing, and waiting for the next flow to start.
In the embodiment, when the refrigerator 10 is not powered on for the first time, the suction pressure value of the compressor 110 is acquired to identify the change of the suction pressure of the compressor 110 by starting to acquire the suction pressure value of the compressor 110 after the timing time from the last defrosting end time to the current time is greater than or equal to the defrosting reference period, so that unnecessary parameter acquisition and logic judgment operations can be avoided on the premise of ensuring complete defrosting, the processing efficiency is improved, and the defrosting efficiency and effectiveness are improved.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A refrigerator defrosting control method comprises the following steps:
acquiring a suction pressure value of a compressor of the refrigerator;
judging whether the suction pressure value is greater than or equal to a preset pressure reference value or not;
and if so, starting a defrosting program to defrost the evaporator of the refrigerator.
2. The refrigerator defrosting control method of claim 1, wherein,
after the suction pressure value is judged to be greater than or equal to a preset pressure reference value, the method further comprises the following steps:
detecting the time interval between the current moment and the last defrosting ending moment;
judging whether the time interval is greater than or equal to a preset defrosting reference period or not;
and if the time interval is greater than or equal to the defrosting reference period, executing the step of defrosting the evaporator of the refrigerator by the starting defrosting program.
3. The refrigerator defrosting control method according to claim 2, wherein,
before the step of obtaining a suction pressure value of a compressor of the refrigerator, the method further comprises: judging whether the refrigerator is powered on for the first time or not;
and if the refrigerator is not powered on for the first time, executing the step of acquiring the suction pressure value of the compressor of the refrigerator.
4. The refrigerator defrosting control method of claim 3, wherein,
if the refrigerator is powered on for the first time, recording the running time of the refrigerator after the refrigerator is powered on for the first time;
and when the running time reaches the preset defrosting time, starting the defrosting program to defrost the evaporator.
5. The refrigerator defrosting control method of claim 1, wherein,
before the step of obtaining a suction pressure value of a compressor of the refrigerator, the method further comprises: judging whether the timing time from the last defrosting ending time to the current time is greater than or equal to a preset defrosting reference period or not;
and if the timing time is greater than or equal to the defrosting reference period, executing the step of acquiring the suction pressure value of the compressor of the refrigerator.
6. The refrigerator defrosting control method according to any one of claims 1 to 5, wherein,
after the step of starting the defrosting program to defrost the evaporator of the refrigerator, the method further comprises:
judging whether the defrosting end point is reached or not;
and if the defrosting end point is reached, ending the defrosting program.
7. The refrigerator defrosting control method of claim 6, wherein,
the step of judging whether the defrosting end point is reached comprises the following steps:
acquiring the temperature of the evaporator;
judging whether the temperature of the evaporator is greater than or equal to a preset defrosting completion temperature or not;
and if the temperature of the evaporator is greater than or equal to the defrosting completion temperature, judging that the defrosting end point is reached.
8. The refrigerator defrosting control method of claim 1, wherein,
the step of obtaining a suction pressure value of a compressor of a refrigerator includes:
and acquiring the suction pressure value of the compressor of the refrigerator in real time.
9. The refrigerator defrosting control method of claim 1, wherein,
the step of obtaining a suction pressure value of a compressor of a refrigerator includes:
periodically acquiring a suction pressure value of a compressor of the refrigerator.
10. A refrigerator, comprising:
a compressor;
an evaporator;
the pressure detection device is arranged at the air suction end of the compressor and used for detecting the air suction pressure of the compressor;
a heating device; and
a control device connected with the pressure detection device and the heating device respectively, and configured to execute the refrigerator defrosting control method according to any one of claims 1 to 9, so as to control the heating device to defrost the evaporator.
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| CN201911274770.4A CN112984891A (en) | 2019-12-12 | 2019-12-12 | Refrigerator and defrosting control method thereof |
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Cited By (1)
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| CN113739464A (en) * | 2021-08-16 | 2021-12-03 | 珠海格力电器股份有限公司 | Method and device for controlling defrosting of direct expansion unit and related equipment |
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Application publication date: 20210618 |