CN107255387B - A method for defrosting a refrigerator - Google Patents
A method for defrosting a refrigerator Download PDFInfo
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- CN107255387B CN107255387B CN201710517945.4A CN201710517945A CN107255387B CN 107255387 B CN107255387 B CN 107255387B CN 201710517945 A CN201710517945 A CN 201710517945A CN 107255387 B CN107255387 B CN 107255387B
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- 238000010257 thawing Methods 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 157
- 238000001816 cooling Methods 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005057 refrigeration Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- F25D21/002—Defroster control
- F25D21/006—Defroster control with electronic control circuits
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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
- F25D21/08—Removing frost by electric heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
Description
技术领域technical field
本发明涉及冷藏冷冻储物领域，特别是涉及一种冰箱的化霜方法。The invention relates to the field of refrigerated and frozen storage, in particular to a method for defrosting a refrigerator.
背景技术Background technique
冰箱是保持恒定低温的一种制冷设备，也是一种使食物或其他物品保持恒定低温冷态的民用产品。风冷技术通过内置隐藏的冷却器(例如冷媒循环系统的蒸发器)对流经其的空气进行制冷，通过风扇强制冷气循环流动，从而使冷气均匀分布于冰箱各个间室，实现制冷。当冰箱内空气经过蒸发器表面时，空气中的水分会凝结在蒸发器表面，由于蒸发器温度过低，一段时间后形成霜层，导致蒸发器传热效率降低直至蒸发器被完全堵塞而失效，降低了冰箱运行效率，必须在运行一段时间后进行化霜。A refrigerator is a refrigeration device that maintains a constant low temperature, and it is also a civilian product that keeps food or other items in a constant low temperature and cold state. Air-cooled technology uses a built-in hidden cooler (such as the evaporator of the refrigerant circulation system) to cool the air flowing through it, and the fan forces the cold air to circulate, so that the cold air is evenly distributed in each compartment of the refrigerator to achieve cooling. When the air in the refrigerator passes through the surface of the evaporator, the moisture in the air will condense on the surface of the evaporator. Because the temperature of the evaporator is too low, a frost layer will form after a period of time, resulting in a decrease in the heat transfer efficiency of the evaporator until the evaporator is completely blocked and fails. , which reduces the operating efficiency of the refrigerator, it must be defrosted after running for a period of time.
现有化霜通常在蒸发器底部设有电加热器，当蒸发器表面霜层达到一定厚度时，冰箱停止制冷，加热器开始工作，加热融化霜层。在对蒸发器进行化霜过程中，蒸发器的底部先受热，因此蒸发器底部的冰霜首先开始融化，后蒸发器中部和上部的冰霜才逐渐融化，因此蒸发器底部受到加热器进行加热的时间比较长，非常容易导致蒸发器底部的塑料件由于受热时间长而出现老化损坏的现象。蒸发器上的冰霜在由下至上的逐渐融化为水的过程中要吸收大量的热量，且融化时间较为漫长，存在着严重的热量浪费现象。The existing defrosting is usually equipped with an electric heater at the bottom of the evaporator. When the frost layer on the surface of the evaporator reaches a certain thickness, the refrigerator stops cooling, and the heater starts to work to heat and melt the frost layer. In the process of defrosting the evaporator, the bottom of the evaporator is heated first, so the frost at the bottom of the evaporator starts to melt first, and then the frost in the middle and upper parts of the evaporator gradually melts, so the time for the bottom of the evaporator to be heated by the heater If it is relatively long, it is very easy to cause aging and damage to the plastic parts at the bottom of the evaporator due to the long heating time. The frost on the evaporator absorbs a lot of heat in the process of gradually melting into water from bottom to top, and the melting time is relatively long, which results in a serious waste of heat.
发明内容Contents of the invention
发明人认为现在冰箱内部化霜的方式基本上都是根据经验值进行化霜，但是冰箱根据正常的使用情况和环境的变化，内部结霜速度是不一样的，并且对于蒸发器本身，因为风向的关系等，蒸发器不同位置结霜速度也是不一样的，在蒸发器底部设有电加热器进行化霜，蒸发器上的冰霜在由下至上的逐渐融化为水的过程中要吸收大量的热量，且融化时间较为漫长，存在着严重的热量浪费现象。The inventor believes that the defrosting method inside the refrigerator is basically based on empirical values, but the internal frosting speed of the refrigerator is different according to the normal use and environmental changes, and for the evaporator itself, because the wind direction The frosting speed at different positions of the evaporator is also different. There is an electric heater at the bottom of the evaporator to defrost. Heat, and the melting time is relatively long, there is a serious waste of heat.
因此，本发明旨在提供一种用于冰箱的化霜方法，可使蒸发器按需化霜，按需化霜不仅包括按照蒸发器的结霜位置进行化霜，还包括按照每个位置处霜层量施加相适应的热量，按需化蒸发器不同位置的霜是非常重要，这样既可以减少耗电量，降低化霜时长，也可以增强保鲜效果。Therefore, the present invention aims to provide a defrosting method for a refrigerator, which can make the evaporator defrost on demand. The defrosting on demand includes not only defrosting according to the frosting position of the evaporator, but also including It is very important to apply appropriate heat to the amount of frost layer and defrost in different positions of the evaporator on demand, which can not only reduce power consumption, shorten the defrosting time, but also enhance the freshness preservation effect.
具体地，本发明提供了一种冰箱的化霜方法，其中所述冰箱包括蒸发器和多个加热丝；每个所述加热丝沿水平方向延伸，且多个所述加热丝沿所述蒸发器的高度方向间隔设置；每个所述加热丝配置成直接或间接地加热所述蒸发器；多个所述加热丝包括第一加热丝；并且所述化霜方法包括：Specifically, the present invention provides a method for defrosting a refrigerator, wherein the refrigerator includes an evaporator and a plurality of heating wires; each of the heating wires extends along the horizontal direction, and a plurality of the heating wires extend along the The height direction of the evaporator is arranged at intervals; each of the heating wires is configured to directly or indirectly heat the evaporator; a plurality of the heating wires includes a first heating wire; and the defrosting method includes:
在所述蒸发器需要化霜时，给每个所述加热丝施加相同的电压，以使每个所述加热丝发热进行化霜；When the evaporator needs to defrost, apply the same voltage to each of the heating wires, so that each of the heating wires generates heat for defrosting;
检测化霜温度，且根据所述化霜温度降低所述第一加热丝上施加的电压；detecting the defrosting temperature, and reducing the voltage applied to the first heating wire according to the defrosting temperature;
在所述化霜温度达到第一预设温度值时，关闭所有的所述加热丝。When the defrosting temperature reaches a first preset temperature value, all the heating wires are turned off.
可选地，所述根据所述化霜温度降低所述第一加热丝上施加的电压包括：Optionally, the reducing the voltage applied to the first heating wire according to the defrosting temperature includes:
在所述化霜温度达到第二预设温度值时，降低所述第一加热丝上施加的电压；所述第二预设温度值小于所述第一预设温度值。When the defrosting temperature reaches a second preset temperature value, the voltage applied to the first heating wire is reduced; the second preset temperature value is smaller than the first preset temperature value.
可选地，所述根据所述化霜温度降低所述第一加热丝上施加的电压还包括：Optionally, the reducing the voltage applied to the first heating wire according to the defrosting temperature further includes:
在所述化霜温度达到第三预设温度值时，进一步降低所述第一加热丝上施加的电压；所述第三预设温度值小于所述第一预设温度值，且所述第三预设温度值大于所述第二预设温度值。When the defrosting temperature reaches a third preset temperature value, further reduce the voltage applied to the first heating wire; the third preset temperature value is less than the first preset temperature value, and the first preset temperature value The three preset temperature values are greater than the second preset temperature value.
可选地，所述根据所述化霜温度降低所述第一加热丝上施加的电压还包括：Optionally, the reducing the voltage applied to the first heating wire according to the defrosting temperature further includes:
在所述化霜温度达到第四预设温度值时，进一步降低所述第一加热丝上施加的电压；所述第四预设温度值小于所述第一预设温度值，且所述第四预设温度值大于所述第三预设温度值。When the defrosting temperature reaches a fourth preset temperature value, further reduce the voltage applied to the first heating wire; the fourth preset temperature value is less than the first preset temperature value, and the first preset temperature value The four preset temperature values are greater than the third preset temperature value.
可选地，按照2％至5％的降幅降低所述第一加热丝上施加的电压。Optionally, the voltage applied to the first heating wire is reduced in a step of 2% to 5%.
可选地，多个所述加热丝还包括第二加热丝，所述第二加热丝设置于所述第一加热丝的下方。Optionally, the plurality of heating wires further include a second heating wire, and the second heating wire is disposed below the first heating wire.
可选地，多个所述加热丝还包括第三加热丝，所述第三加热丝设置于所述第一加热丝的上方；所述化霜方法还包括：根据所述化霜温度降低所述第三加热丝上施加的电压。Optionally, the plurality of heating wires further include a third heating wire, and the third heating wire is arranged above the first heating wire; the defrosting method further includes: reducing the The voltage applied to the third heating wire.
可选地，根据所述化霜温度同时降低所述第一加热丝和所述第三加热丝上施加的电压；且Optionally, reducing the voltages applied to the first heating wire and the third heating wire at the same time according to the defrosting temperature; and
在降低所述第一加热丝和所述第三加热丝上施加的电压时，所述第一加热丝上施加的电压的降幅小于所述第三加热丝上施加的电压的降幅。When reducing the voltages applied to the first heating wire and the third heating wire, the voltage applied to the first heating wire decreases less than the voltage applied to the third heating wire.
可选地，利用脉冲宽度调制技术降低所述第一加热丝上施加的电压。Optionally, a pulse width modulation technique is used to reduce the voltage applied to the first heating wire.
可选地，所述冰箱还包括冷却室和温度传感器，所述蒸发器、多个所述加热丝和所述温度传感器设置于所述冷却室内，且所述温度传感器设置于所述蒸发器的上方；Optionally, the refrigerator further includes a cooling chamber and a temperature sensor, the evaporator, a plurality of the heating wires and the temperature sensor are arranged in the cooling chamber, and the temperature sensor is arranged in the evaporator above;
所述温度传感器配置成检测所述化霜温度；且the temperature sensor is configured to detect the defrost temperature; and
所述第二预设温度值为3.6℃至4.4℃；The second preset temperature value is 3.6°C to 4.4°C;
所述第一预设温度值为6.6℃至7.4℃。The first preset temperature value is 6.6°C to 7.4°C.
本发明的冰箱的化霜方法可根据蒸发器上不同位置的结霜量、化霜温度，适当减少不同位置处加热丝的放热量，以使冰箱的蒸发器可按需化霜，按需化蒸发器不同位置的霜是非常重要，这样既可以减少耗电量，降低化霜时长，也可以增强保鲜效果。The defrosting method of the refrigerator according to the present invention can properly reduce the heat release of the heating wire at different positions according to the amount of frosting and the defrosting temperature at different positions on the evaporator, so that the evaporator of the refrigerator can defrost on demand and defrost on demand. The frost in different positions of the evaporator is very important, which can not only reduce power consumption, shorten the defrosting time, but also enhance the freshness preservation effect.
根据下文结合附图对本发明具体实施例的详细描述，本领域技术人员将会更加明了本发明的上述以及其他目的、优点和特征。According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention.
附图说明Description of drawings
后文将参照附图以示例性而非限制性的方式详细描述本发明的一些具体实施例。附图中相同的附图标记标示了相同或类似的部件或部分。本领域技术人员应该理解，这些附图未必是按比例绘制的。附图中：Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:
图1是根据本发明一个实施例的冰箱的示意性结构图；Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention;
图2是根据本发明一个实施例的冰箱的示意性局部结构图；Fig. 2 is a schematic partial structural diagram of a refrigerator according to an embodiment of the present invention;
图3是图2所示结构的示意性侧视图；Fig. 3 is a schematic side view of the structure shown in Fig. 2;
图4是根据本发明一个实施例的冰箱的化霜方法的示意性流程图。Fig. 4 is a schematic flowchart of a method for defrosting a refrigerator according to an embodiment of the present invention.
具体实施方式Detailed ways
图1是根据本发明一个实施例的冰箱的示意性结构图；图2是根据本发明一个实施例的冰箱的示意性局部结构图；图3是图2所示结构的示意性侧视图。如图1、图2和图3所示，本发明实施例提供了一种冰箱。该冰箱可包括箱体10、门体、制冷系统和结霜情况检测装置以及融霜加热装置。Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention; Fig. 2 is a schematic partial structural diagram of a refrigerator according to an embodiment of the present invention; Fig. 3 is a schematic side view of the structure shown in Fig. 2 . As shown in FIG. 1 , FIG. 2 and FIG. 3 , an embodiment of the present invention provides a refrigerator. The refrigerator may include a box body 10, a door body, a refrigeration system, a frost detection device and a defrost heating device.
箱体10内具有多个储物间室。储物间室用于储存食物。本发明实施例中的多个储物间室可包括经常储存蔬菜的冷藏室11，其温控范围一般在-5℃至7℃。多个储物间室还可包括冷冻室12、变温室等。门体可为多个，每个门体配置成受控地打开或关闭一个储物间室。进一步地，箱体10还具有压缩机仓、冷却室，以及连通储物间室和冷却室的风道系统。冷却室可处于冷冻室12的后侧。图1中，冷却室与冷冻室12间的风道盖板未示出。There are multiple storage compartments inside the box body 10 . Storage compartments are used to store food. The plurality of storage compartments in the embodiment of the present invention may include a refrigerator compartment 11 for frequently storing vegetables, and its temperature control range is generally -5°C to 7°C. The plurality of storage compartments may also include a freezer compartment 12, a climate change compartment, and the like. There may be multiple doors, and each door is configured to open or close a storage compartment in a controlled manner. Further, the box body 10 also has a compressor chamber, a cooling chamber, and an air duct system connecting the storage compartment and the cooling chamber. The cooling compartment may be at the rear side of the freezing compartment 12 . In Fig. 1, the air duct cover plate between the cooling chamber and the freezing chamber 12 is not shown.
制冷系统配置成提供冷量以降低储物间室内的温度。具体地，制冷系统可为压缩式制冷系统，其包括压缩机、冷凝器、节流装置和蒸发器20等。压缩机可设置于压缩机仓内。蒸发器20可设置于冷却室内，配置成利用进入其内的冷媒降低冷却室内的气体温度，以经由风道系统使储物间室内的温度保持在预设温度处或预设温度范围内。The refrigeration system is configured to provide cooling to reduce the temperature within the storage compartment. Specifically, the refrigeration system may be a compression refrigeration system, which includes a compressor, a condenser, a throttling device, an evaporator 20 and the like. The compressor can be arranged in the compressor chamber. The evaporator 20 may be disposed in the cooling chamber, configured to use the refrigerant entering the cooling chamber to reduce the temperature of the air in the cooling chamber, so as to maintain the temperature in the storage compartment at a preset temperature or within a preset temperature range through the air duct system.
结霜情况检测装置可设置于冷却室内，用于使冰箱根据结霜情况检测装置的检测结果判断冰箱是否需要化霜。在一些实施方式中，结霜情况检测装置包括温度传感器，温度传感器设置于蒸发器的上方，配置成检测蒸发器的温度以及蒸发器的化霜温度。在另一些实施方式中，温度传感器可设置于蒸发器上。在又一些实施方式中，结霜情况检测装置包括一个或多个差压传感器60。当差压传感器60为多个时，多个差压传感器60沿蒸发器20的长度方向间隔设置；每个差压传感器60配置成检测蒸发器20的沿蒸发器20的高度方向设置的两个部位处之间的压力差。任意两个差压传感器60检测的沿蒸发器20的高度方向设置的两个部位处可相同也可不相同，优选为不相同。在一些替代性实施例中，也可根据冰箱的压缩机的连续运行时间和/或压缩机的总运行时间判断蒸发器是否需要化霜。The frosting condition detecting device can be arranged in the cooling chamber, and is used for the refrigerator to judge whether the refrigerator needs defrosting according to the detection result of the frosting condition detecting device. In some embodiments, the frosting detection device includes a temperature sensor, which is disposed above the evaporator and configured to detect the temperature of the evaporator and the defrosting temperature of the evaporator. In other embodiments, the temperature sensor may be located on the evaporator. In yet other embodiments, the frosting detection device includes one or more differential pressure sensors 60 . When there are multiple differential pressure sensors 60, multiple differential pressure sensors 60 are arranged at intervals along the length direction of the evaporator 20; pressure difference between them. The two locations along the height direction of the evaporator 20 detected by any two differential pressure sensors 60 may be the same or different, preferably different. In some alternative embodiments, it may also be determined whether the evaporator needs defrosting according to the continuous running time of the compressor of the refrigerator and/or the total running time of the compressor.
融霜加热装置可具有多个加热丝40。每个加热丝40可沿水平方向延伸，且多个加热丝40沿蒸发器20的高度方向间隔设置，每个加热丝40配置成直接或间接地加热蒸发器20，以使多个加热丝40可在多个不同高度位置处对蒸发器20进行加热。进一步地，融霜加热装置还可包括导热板30。导热板30设置于蒸发器20的一侧，且与蒸发器20热接触(即进行接触式热连接)。每个加热丝40与导热板30热接触。导热板30可用于使热量从加热丝40处扩散到蒸发器20上，提高除霜效率。在本发明的一些优选的实施例中，导热板30设置于多个加热丝40与蒸发器20之间，以将每个加热丝40产生的热量传递至蒸发器20。在另一些优选实施例中，多个加热丝40设置于导热板30内。The defrost heater can have a plurality of heating wires 40 . Each heating wire 40 can extend along the horizontal direction, and a plurality of heating wires 40 are arranged at intervals along the height direction of the evaporator 20, and each heating wire 40 is configured to directly or indirectly heat the evaporator 20, so that the plurality of heating wires 40 The evaporator 20 can be heated at a number of different height positions. Further, the defrosting heating device may further include a heat conducting plate 30 . The heat conducting plate 30 is disposed on one side of the evaporator 20 and is in thermal contact with the evaporator 20 (that is, is in contact thermal connection). Each heating wire 40 is in thermal contact with the heat conducting plate 30 . The heat conduction plate 30 can be used to spread heat from the heating wire 40 to the evaporator 20 to improve the defrosting efficiency. In some preferred embodiments of the present invention, the heat conducting plate 30 is disposed between the plurality of heating wires 40 and the evaporator 20 to transfer the heat generated by each heating wire 40 to the evaporator 20 . In some other preferred embodiments, a plurality of heating wires 40 are disposed in the heat conducting plate 30 .
图4是根据本发明一个实施例的冰箱的化霜方法的示意性流程图。如图4所示，特别地，本发明实施例还提供了一种冰箱的化霜方法。多个加热丝40可包括第一加热丝。每根加热丝40的最高发热功率优选为一样，即采用相同的多个加热丝40。化霜方法可包括：Fig. 4 is a schematic flowchart of a method for defrosting a refrigerator according to an embodiment of the present invention. As shown in FIG. 4 , in particular, an embodiment of the present invention also provides a method for defrosting a refrigerator. The plurality of heating wires 40 may include a first heating wire. The maximum heating power of each heating wire 40 is preferably the same, that is, the same multiple heating wires 40 are used. Defrost methods may include:
在蒸发器需要化霜时，给每个加热丝施加相同的电压，以使每个加热丝发热进行化霜。在蒸发器需要化霜时，还可至少使冰箱的每个储物间室的进风风门关闭。When the evaporator needs defrosting, apply the same voltage to each heating wire to make each heating wire generate heat for defrosting. When the evaporator needs defrosting, at least the air intake door of each storage compartment of the refrigerator can be closed.
检测化霜温度，且根据化霜温度降低第一加热丝上施加的电压。根据蒸发器20结霜的规律，一般蒸发器20底端结霜速度快于蒸发器20上端，在化霜时，可适当降低一些加热丝40的电压，可降低该加热丝40的发热量，从而可实现按需化霜，以使蒸发器较薄地方的霜层获取适当的热量，节省电能。The defrosting temperature is detected, and the voltage applied to the first heating wire is reduced according to the defrosting temperature. According to the frosting law of the evaporator 20, generally the frosting speed at the bottom of the evaporator 20 is faster than that at the upper end of the evaporator 20. When defrosting, the voltage of some heating wires 40 can be appropriately reduced to reduce the calorific value of the heating wires 40. Thus, on-demand defrosting can be realized, so that the frost layer in the thinner part of the evaporator can obtain appropriate heat and save electric energy.
在化霜温度达到第一预设温度值时，关闭所有的加热丝。温度传感器设置于蒸发器的上方；温度传感器配置成检测化霜温度；且第一预设温度值为6.6℃至7.4℃，例如6.9℃、7℃等。When the defrosting temperature reaches the first preset temperature value, all heating wires are turned off. The temperature sensor is arranged above the evaporator; the temperature sensor is configured to detect the defrosting temperature; and the first preset temperature value is 6.6°C to 7.4°C, such as 6.9°C, 7°C and so on.
具体地，在本发明的一些具体的实施例中，根据化霜温度降低第一加热丝上施加的电压可包括：在化霜温度达到第二预设温度值时，降低第一加热丝上施加的电压；第二预设温度值小于第一预设温度值。第二预设温度值可为3.6℃至4.4℃，例如3.9℃、4℃等。进一步地，根据化霜温度降低第一加热丝上施加的电压还可包括：在化霜温度达到第三预设温度值时，进一步降低第一加热丝上施加的电压；第三预设温度值小于第一预设温度值，且第三预设温度值大于第二预设温度值。以及，在化霜温度达到第四预设温度值时，进一步降低第一加热丝上施加的电压；第四预设温度值小于第一预设温度值，且第四预设温度值大于第三预设温度值。第三预设温度值可为4.6℃至5.4℃，例如4.9℃、5℃等。第四预设温度值可为5.6℃至6.4℃，例如5.9℃、6℃等。Specifically, in some specific embodiments of the present invention, reducing the voltage applied to the first heating wire according to the defrosting temperature may include: reducing the voltage applied to the first heating wire when the defrosting temperature reaches the second preset temperature value. The voltage; the second preset temperature value is less than the first preset temperature value. The second preset temperature value may be 3.6°C to 4.4°C, such as 3.9°C, 4°C and so on. Further, reducing the voltage applied to the first heating wire according to the defrosting temperature may also include: further reducing the voltage applied to the first heating wire when the defrosting temperature reaches a third preset temperature value; the third preset temperature value less than the first preset temperature value, and the third preset temperature value is greater than the second preset temperature value. And, when the defrosting temperature reaches the fourth preset temperature value, further reduce the voltage applied to the first heating wire; the fourth preset temperature value is less than the first preset temperature value, and the fourth preset temperature value is greater than the third Preset temperature value. The third preset temperature value may be 4.6°C to 5.4°C, such as 4.9°C, 5°C, and so on. The fourth preset temperature value may be 5.6°C to 6.4°C, such as 5.9°C, 6°C, and so on.
在本发明的一些实施例中，可利用脉冲宽度调制技术(即pwm)降低第一加热丝上施加的电压。而且，可按照2％至5％的降幅降低第一加热丝上施加的电压，例如按照3％的降幅。在本发明的一些替代性实施例中，也可按照预设值降低第一加热丝上施加的电压，例如，每次降低3V、5V、10V等，可根据具体地大小的蒸发器和加热丝的电阻等实际情况进行设置。In some embodiments of the present invention, pulse width modulation (ie pwm) can be used to reduce the voltage applied to the first heating wire. Furthermore, the voltage applied to the first heating wire may be reduced by a step of 2% to 5%, for example by a step of 3%. In some alternative embodiments of the present invention, the voltage applied to the first heating wire can also be reduced according to a preset value, for example, by 3V, 5V, 10V, etc. each time, according to the specific size of the evaporator and the heating wire The resistance and other actual conditions are set.
在本发明的一些实施例中，多个加热丝还包括第二加热丝，第二加热丝设置于第一加热丝的下方。优选地，第二加热丝可为最下方的加热丝40，由于蒸发器20底部的霜层最后，可始终使第二加热丝40按照最高发热功率加热，即在整个除霜过程中不调整第二加热丝上施加的电压。在本发明的一些替代性实施例中，也可根据需要，即根据化霜温度降低或增加第二加热丝上施加的电压。In some embodiments of the present invention, the plurality of heating wires further include a second heating wire, and the second heating wire is disposed below the first heating wire. Preferably, the second heating wire can be the lowermost heating wire 40. Since the frost layer at the bottom of the evaporator 20 is the last, the second heating wire 40 can always be heated according to the highest heating power, that is, the second heating wire 40 is not adjusted during the entire defrosting process. 2. The voltage applied to the heating wire. In some alternative embodiments of the present invention, the voltage applied to the second heating wire can also be decreased or increased according to needs, ie according to the defrosting temperature.
在本发明的一些实施例中，多个加热丝还可包括第三加热丝，第三加热丝设置于第一加热丝的上方；化霜方法还包括：根据化霜温度降低第三加热丝上施加的电压。进一步地优选地，可根据化霜温度同时降低第一加热丝和第三加热丝上施加的电压。而且，在降低第一加热丝和第三加热丝上施加的电压时，第一加热丝上施加的电压的降幅小于第三加热丝上施加的电压的降幅。例如，可按照5％至8％的降幅降低第三加热丝上施加的电压。在本发明的一些替代性实施例中，可根据化霜温度分别降低第一加热丝和第三加热丝上施加的电压。例如，在化霜温度达到第二预设温度值时，降低第一加热丝上施加的电压；第二预设温度值小于第一预设温度值。在化霜温度达到第五预设温度值时，降低第三加热丝上施加的电压；第三预设温度值可小于第二预设温度值。In some embodiments of the present invention, the plurality of heating wires may also include a third heating wire, and the third heating wire is arranged above the first heating wire; the defrosting method further includes: lowering the temperature on the third heating wire according to the defrosting temperature applied voltage. Further preferably, the voltages applied to the first heating wire and the third heating wire can be simultaneously reduced according to the defrosting temperature. Moreover, when the voltages applied to the first heating wire and the third heating wire are reduced, the drop range of the voltage applied to the first heating wire is smaller than the drop range of the voltage applied to the third heating wire. For example, the voltage applied to the third heating wire can be reduced by a step of 5% to 8%. In some alternative embodiments of the present invention, the voltages applied to the first heating wire and the third heating wire can be respectively reduced according to the defrosting temperature. For example, when the defrosting temperature reaches a second preset temperature value, the voltage applied to the first heating wire is reduced; the second preset temperature value is smaller than the first preset temperature value. When the defrosting temperature reaches the fifth preset temperature value, the voltage applied to the third heating wire is reduced; the third preset temperature value may be smaller than the second preset temperature value.
在本发明的一些实施例中，加热丝40的数量可为至少4根。在化霜时，除最下方的加热丝外，其余每根加热丝上施加的电压都可根据化霜温度进行降低。当然，最下方的加热丝上施加的电压也可根据化霜温度进行调整。In some embodiments of the present invention, the number of heating wires 40 may be at least four. During defrosting, except for the bottom heating wire, the voltage applied to each heating wire can be reduced according to the defrosting temperature. Of course, the voltage applied to the bottom heating wire can also be adjusted according to the defrosting temperature.
在本发明的一些实施例中，多个加热丝40可分为多组，每组加热丝可包括至少一个加热丝。在化霜时，除最下方的一组加热丝外，其余每组加热丝上施加的电压都可根据化霜温度进行降低，该组加热丝中电压降低的时机和幅度应相同。例如，该组加热丝包括第一加热丝，该组加热丝中每根加热丝上施加的电压应和第一加热丝上施加的电压同时进行调整，且调整相同的幅度。也就是说，第一加热丝上施加的电压在调整时，其上方的一根或多根加热丝，以及和/或其下方的一根或多根加热丝同时按照相同的降幅进行调整。当然，最下方的一组加热丝上施加的电压也可根据化霜温度进行调整。In some embodiments of the present invention, the plurality of heating wires 40 can be divided into multiple groups, and each group of heating wires can include at least one heating wire. During defrosting, except for the bottom group of heating wires, the voltage applied to each group of heating wires can be reduced according to the defrosting temperature, and the timing and magnitude of voltage reduction in the group of heating wires should be the same. For example, the group of heating wires includes the first heating wire, and the voltage applied to each heating wire in the group of heating wires should be adjusted at the same time as the voltage applied to the first heating wire, and adjusted to the same amplitude. That is to say, when the voltage applied to the first heating wire is adjusted, one or more heating wires above it and/or one or more heating wires below it are simultaneously adjusted according to the same decrease. Of course, the voltage applied to the bottom group of heating wires can also be adjusted according to the defrosting temperature.
至此，本领域技术人员应认识到，虽然本文已详尽示出和描述了本发明的多个示例性实施例，但是，在不脱离本发明精神和范围的情况下，仍可根据本发明公开的内容直接确定或推导出符合本发明原理的许多其他变型或修改。因此，本发明的范围应被理解和认定为覆盖了所有这些其他变型或修改。So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.
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