阅读说明：本技术 冰箱化霜检测装置、冰箱化霜控制方法及冰箱 (Refrigerator defrosting detection device, refrigerator defrosting control method and refrigerator ) 是由 卢起彪 刘华 韩鹏 邓涵 朱文琪 孟贺 陆文怡 周琳琳 于 2019-12-03 设计创作，主要内容包括：本发明公开了冰箱化霜检测装置、冰箱化霜控制方法及冰箱,冰箱化霜检测装置包括：靠近回风口的化霜感温包和设置在蒸发器盘管上的管温感温包,化霜感温包与蒸发器盘管之间留有结霜间距,冰箱控制器根据管温感温包和化霜感温包的温度控制冰箱的化霜操作。本发明可精确判断蒸发器结霜量,确定准确的化霜间隔,避免出现传统冰箱无法精确评估结霜量,调节下一个化霜间隔存在较大偏差的问题,大幅提高了冰箱的节能性和运行的可靠性。(The invention discloses a refrigerator defrosting detection device, a refrigerator defrosting control method and a refrigerator, wherein the refrigerator defrosting detection device comprises: the defrosting device comprises a defrosting temperature sensing bag close to the air return opening and a tube temperature sensing bag arranged on the evaporator coil, a frosting interval is reserved between the defrosting temperature sensing bag and the evaporator coil, and the refrigerator controller controls defrosting operation of the refrigerator according to the temperatures of the tube temperature sensing bag and the defrosting temperature sensing bag. The invention can accurately judge the frosting amount of the evaporator, determine the accurate defrosting interval, avoid the problems that the traditional refrigerator can not accurately evaluate the frosting amount and adjust the next defrosting interval with larger deviation, and greatly improve the energy saving property and the operation reliability of the refrigerator.)

1. A refrigerator defrosting detection device is characterized by comprising: the defrosting device comprises a defrosting temperature sensing bag close to the air return opening and a tube temperature sensing bag arranged on the evaporator coil, a frosting interval is reserved between the defrosting temperature sensing bag and the evaporator coil, and the refrigerator controller controls defrosting operation of the refrigerator according to the temperatures of the tube temperature sensing bag and the defrosting temperature sensing bag.

2. The frost detecting apparatus of claim 1, wherein said return air inlet is located below said evaporator, and said frost formation space is provided between said defrosting thermal bulb and said evaporator bottom coil.

3. The frost detecting apparatus of claim 2, wherein the frost bulb is mounted on the evaporator by a mounting bracket.

4. A refrigerator defrosting control method is characterized in that a defrosting temperature sensing bag is installed at a position close to an air return opening, a frosting interval is reserved between the defrosting temperature sensing bag and an evaporator coil, and a tube temperature sensing bag used for detecting the temperature of the evaporator coil is installed on an evaporator;

the refrigerator defrosting control method comprises the steps of detecting the temperatures of a defrosting thermal bulb and a tube thermal bulb, calculating the difference value between the temperature Tf of the defrosting thermal bulb and the temperature Tt of the tube thermal bulb, judging whether the difference value is smaller than or equal to a first set threshold value △ T1, and if yes, entering the defrosting operation of the refrigerator.

5. The defrosting control method of a refrigerator as claimed in claim 4, wherein the detection of the temperature of the defrosting bulb and the tube temperature bulb is started after the refrigerating operation time of the refrigerator reaches a preset time t 1.

6. The refrigerator defrosting control method according to claim 4, wherein after entering the defrosting operation, the refrigerator determines whether a defrosting exit condition is satisfied according to the tube temperature bulb temperature Tt and/or the defrosting time, and when the defrosting exit condition is satisfied, the refrigerator exits the defrosting operation.

7. The refrigerator defrosting control method according to claim 6, wherein the determining whether the defrosting exit condition is satisfied according to the tube temperature bulb temperature Tt comprises: and judging whether the temperature Tt of the tube temperature thermal bulb is greater than or equal to a second set threshold value T2, if so, meeting a defrosting exit condition, and exiting the defrosting operation of the refrigerator.

8. The refrigerator defrosting control method according to claim 6, wherein the judging whether the defrosting exit condition is satisfied according to the defrosting time includes: starting to time defrosting time when the refrigerator enters defrosting operation, judging whether the defrosting time is greater than or equal to a set value t2, if so, meeting a defrosting exit condition, and exiting the defrosting operation.

9. The refrigerator defrosting control method of claim 6, wherein the refrigerator resumes the cooling operation after exiting the defrosting operation.

10. A refrigerator characterized in that the refrigerator employs the refrigerator defrosting control method as claimed in any one of claims 4 to 9.

Technical Field

The invention relates to the technical field of refrigeration, in particular to a refrigerator defrosting detection device, a refrigerator defrosting control method and a refrigerator.

Background

The air-cooled refrigerator has an automatic defrosting function, and common defrosting control modes have three forms:

1. the whole machine is in a timing type, namely the frosting time is preset, the refrigerator carries out defrosting at intervals of the preset frosting time, if the frosting time is set to be shorter, the defrosting times are frequent, and the power consumption of the refrigerator is increased; if the frosting time is set to be longer, the single defrosting time is long, and the fresh-keeping effect of the refrigerator is influenced;

2. the compressor running time type is that the starting time of defrosting operation is determined according to the running time of the compressor, the actual use condition of the air-cooled refrigerator is not considered in the mode, the calculated time error is large, and the limitation is very obvious;

3. the variable type, the air-cooled refrigerator at present is mainly in a variable type defrosting control mode, and the frosting amount is evaluated to adjust the next defrosting interval by detecting parameters such as the accumulated running time of a compressor, the running time of a freezing fan, the door opening and closing times, the door opening duration, the temperature change of an evaporator tube, the temperature change of a compartment and the like. In actual use, the difference between the use environment (temperature and humidity) of a user and the types and the quantity of the taken and placed articles is large, the frosting rate of the refrigerator is greatly changed, and the variable defrosting controller cannot accurately estimate the frosting amount, so that the next defrosting interval is adjusted to have large deviation. If the defrosting interval is too short, the power consumption of the refrigerator is wasted; if the defrosting interval is too long, the frost layer is too thick, the heat exchange capacity of the evaporator is sharply reduced, even the defrosting is not clean, the evaporator is frozen for a long time, the performance is degraded, and the refrigerating capacity of the refrigerator is reduced.

Therefore, how to design a more precise defrosting control method for a refrigerator is an urgent technical problem to be solved in the industry.

Disclosure of Invention

The invention provides a refrigerator defrosting detection device, a refrigerator defrosting control method and a refrigerator, aiming at solving the defect that the existing defrosting control mode is low in accuracy.

The invention adopts the technical scheme that the refrigerator defrosting detection device comprises: the defrosting device comprises a defrosting temperature sensing bag close to the air return opening and a tube temperature sensing bag arranged on the evaporator coil, a frosting interval is reserved between the defrosting temperature sensing bag and the evaporator coil, and the refrigerator controller controls defrosting operation of the refrigerator according to the temperatures of the tube temperature sensing bag and the defrosting temperature sensing bag.

Preferably, the air return opening is positioned below the evaporator, and a frosting space is reserved between the defrosting thermal bulb and the bottom coil pipe of the evaporator.

Preferably, the defrosting thermal bulb is installed on the evaporator through a mounting bracket.

The invention also provides a refrigerator defrosting control method, wherein a defrosting temperature sensing bag is arranged at a position close to the air return opening in advance, a frosting interval is reserved between the defrosting temperature sensing bag and the evaporator coil, and a tube temperature sensing bag for detecting the temperature of the evaporator coil is arranged on the evaporator.

Preferably, after the refrigerating operation time of the refrigerator reaches the preset time t1, the temperature of the defrosting temperature sensing bulb and the tube temperature sensing bulb is detected.

Preferably, after the refrigerator enters the defrosting operation, whether the defrosting exit condition is met or not is judged according to the tube temperature bulb temperature Tt and/or the defrosting time, and when the defrosting exit condition is met, the refrigerator exits the defrosting operation.

Judging whether the defrosting exit condition is met according to the tube temperature sensing bulb temperature Tt comprises the following steps: and judging whether the temperature Tt of the tube temperature thermal bulb is greater than or equal to a second set threshold value T2, if so, meeting a defrosting exit condition, and exiting the defrosting operation of the refrigerator.

Judging whether the defrosting exit condition is met according to the defrosting time comprises the following steps: and starting to time the defrosting time when the refrigerator enters the defrosting operation, judging whether the defrosting time is greater than or equal to a set value t2, if so, meeting a defrosting exit condition, and exiting the defrosting operation.

Preferably, the refrigerator resumes cooling operation after exiting the defrosting operation.

The invention also provides a refrigerator which adopts the refrigerator defrosting control method.

Compared with the prior art, the defrosting method is based on the growth characteristics and the distribution rule of the double layers of the evaporator, the defrosting temperature-sensing bulb is arranged at the maximum frosting position of the evaporator, the temperature difference value of the defrosting temperature-sensing bulb and the temperature-sensing bulb of the pipe is compared with the first set threshold value, the frosting amount of the evaporator can be accurately judged, the accurate defrosting interval is determined, the problems that the frosting amount cannot be accurately estimated in the traditional refrigerator and the adjustment of the next defrosting interval has large deviation are solved, and the energy saving performance and the operation reliability of the refrigerator are greatly improved.

Drawings

The invention is described in detail below with reference to examples and figures, in which:

FIG. 1 is a schematic side view of a defrosting detection unit according to the present invention;

FIG. 2 is a schematic rear view of the defrosting detection unit according to the present invention;

FIG. 3 is a flow chart of the defrosting control method according to the invention.

Detailed Description

As shown in fig. 1, the defrosting detection device provided by the present invention is applicable to a refrigerator, and the refrigerator includes: compressor 7, evaporator 3, freezing fan 10, defrosting heater 5 and refrigerator controller etc, the refrigerator is equipped with freezer 11, the rear side of freezer 11 is equipped with the first chamber that holds that is used for installing evaporator 3 and the second that is used for installing compressor 7 holds the chamber, first chamber that holds is located the top that the second held the chamber, the top that first holds the chamber is equipped with the air outlet, be equipped with cold wind channel 8 between air outlet and the freezer 11, dispose the freezing air intake 9 that stretches into freezer 11 on the cold wind channel 8, the bottom that first holds the chamber is equipped with return air inlet 6, be equipped with freezing return air duct between return air inlet 6 and the bottom of freezer, evaporator 3 adopts common freezing evaporimeter, defrosting heater 5 is located the below of evaporator 3, the frost layer on evaporator 3 is melted to the heat that produces when defrosting heater 5 opens, freezing fan 10 installs the air outlet in first chamber that holds, the freezing fan 10 drives the air flow in the refrigerator to circularly flow, and the refrigerator controller is connected with the compressor 7, the evaporator 3, the freezing fan 10 and the defrosting heater 5 and is used for controlling and adjusting the running state of the refrigerator.

In some embodiments, the refrigerator is further provided with a refrigerating chamber located above the freezing chamber 11, the cold air duct 8 is communicated to the refrigerating chamber, and a refrigerating return air passage 8 communicating the refrigerating chamber and the first accommodating chamber is provided at the rear side of the first accommodating chamber. During the refrigerator refrigeration, the air current is respectively from walk-in and freezer 11 along freezing return air wind channel, cold-stored return air passageway 8 gets into first chamber of holding, the air current is when the evaporimeter 3 is refrigerated, aqueous vapor in the air current freezes on coil pipe 31 and the fin of evaporimeter 3 and forms the frost, air current after the cooling is sent into walk-in and freezer 11 from cold wind channel 8 again, after carrying out the heat exchange with the edible material, the temperature of air current, humidity rises, the temperature, the air current that humidity risees is again from freezing return air wind channel and cold-stored return air wind channel 8 through evaporimeter 3, cooled once more, condense into the frost, the air current in the refrigerator so constantly circulates.

As shown in fig. 1 and 2, the defrosting detection device comprises a defrosting thermal bulb 4 and a pipe thermal bulb 2, wherein the pipe thermal bulb 2 is arranged on an evaporator coil 31 and is used for detecting the temperature of the evaporator coil 31, the pipe thermal bulb 2 can be arranged at the position of an inlet or an outlet of an evaporator 3, the mounting position of the defrosting thermal bulb 4 is close to a return air inlet 6 and is used for detecting the return air temperature, a frosting interval is reserved between the defrosting thermal bulb 4 and the evaporator coil 31 and is usually 5-10 mm, the frosting interval in practical application can be designed according to specific conditions, the refrigerator can keep normal refrigeration operation when the thickness of a frost layer on the coil 31 is within the frosting interval, frequent defrosting of the refrigerator is prevented, in a preferred embodiment, the pipe thermal bulb 2 is arranged on the outlet of the evaporator coil 31, the return air inlet 6 is positioned below the evaporator 3, the evaporator coil 31 is closest to the return air inlet, the defrosting thermal bulb 4 is connected with the evaporator coil 31, the defrosting coil 4 is connected with the evaporator coil 31, and the defrosting pipe thermal bulb 2 is connected with the evaporator coil 3, and the evaporator coil is less than the defrosting temperature of the evaporator coil 3 when the difference value T is less than the difference of the defrosting temperature of the refrigerator, and the defrosting temperature of the evaporator coil 3, and the refrigerating capacity of the refrigerator is judged to be less than the difference value T3, and the difference value T, and the difference value of the refrigerating capacity of the refrigerator is less than the refrigerating capacity of the refrigerator.

The design principle of the invention is as follows: in the refrigeration process, the coil 31 at the bottommost part of the evaporator 3 is positioned at the return air inlet 6 and is firstly contacted with return air with higher temperature and humidity, so that the frosting of the coil in the area is the most serious and can also represent the frosting state of the evaporator 3. When the coil 31 at the bottommost part of the evaporator 3 frosts thinly, the influence on the heat exchange capacity of the evaporator 3 is small, and at the moment, the defrosting thermal bulb 4 does not contact with the frost layer, so that the temperature Tf detected by the defrosting thermal bulb 4 is the return air temperature, and the temperature difference between the return air temperature and the temperature Tt of the coil 31 is large. When the frost is thick on the coil 31 at the bottom of the evaporator 3, the frost layer contacts the defrosting bulb 4, the temperature Tf detected by the defrosting bulb 4 is far lower than the return air temperature, and the temperature difference between the temperature Tt and the coil 31 is small.

The defrosting thermal bulb 4 is installed on the evaporator 3 through the installation support 12, one end of the installation support 12 is a fixed end which is fixed on the evaporator coil 31 or the evaporator side plate, the other end of the installation support 12 is an installation end which is fixedly installed with the defrosting thermal bulb 4. In the preferred embodiment, the fixed end is a resilient clip that grips the evaporator coil 31 to complete the fixed mounting of the mounting bracket 12. Of course, the fixing end can be designed into other structures, for example, the fixing end is fixed on the evaporator side plate by means of screw fixation, or the fixing end is fixed on the evaporator side plate by means of elastic self-locking structure, and the specific installation manner of the mounting bracket 12 is not limited by the invention.

As shown in FIG. 3, the method for controlling defrosting of a refrigerator according to the present invention comprises calculating a difference between a temperature Tf of a defrosting thermal bulb and a temperature Tt of a tube thermal bulb according to temperatures detected by the defrosting thermal bulb 4 and the tube thermal bulb 2, determining whether the difference is less than or equal to a first threshold △ T1, if so, entering a defrosting operation of the refrigerator, and in order to prevent defrosting error, determining whether a refrigerating operation time of the refrigerator reaches a preset time T1 before the temperatures of the defrosting thermal bulb 4 and the tube thermal bulb 2 are detected, and if so, starting to detect the temperatures of the defrosting thermal bulb 4 and the tube thermal bulb 2.

Further, after the refrigerator enters the defrosting operation, whether the defrosting exit condition is met or not is judged according to the temperature Tt of the tube temperature thermal bulb and/or the defrosting time, and when the defrosting exit condition is met, the refrigerator exits the defrosting operation.

Judging whether the defrosting exit condition is met according to the tube temperature sensing bulb 2 comprises the following steps: and judging whether the temperature Tt of the tube temperature thermal bulb is greater than or equal to a second set threshold value T2, if so, meeting a defrosting exit condition, and exiting the defrosting operation and recovering the refrigerating operation of the refrigerator.

Judging whether the defrosting exit condition is met according to the defrosting time comprises the following steps: and starting to time the defrosting time when the refrigerator enters the defrosting operation, judging whether the defrosting time is greater than or equal to a set value t2, if so, meeting a defrosting exit condition, and exiting the defrosting operation and recovering the refrigerating operation of the refrigerator.

In a preferred embodiment, the two defrosting exit conditions are performed simultaneously, and when any one defrosting exit condition is met, the refrigerator exits the defrosting operation and resumes the cooling operation. Of course, the refrigerator may be set to exit the defrosting operation and resume the cooling operation when two defrosting exit conditions are simultaneously satisfied.

The invention also provides a refrigerator which adopts the refrigerator defrosting control method.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.